专利汇可以提供FUEL CELL SYSTEM专利检索,专利查询,专利分析的服务。并且A fuel cell system (10) is equipped with a prediction unit and a resetting unit. The prediction unit is configured to predict, based on an output voltage value of a fuel cell (20) in a low current region, that a voltage drop occurs in a high current region, when an output current value of the fuel cell (20) is in the low current region and a target current value is above a current threshold that is set in the high current region. The resetting unit is configured to reset the target current value to a current value that is smaller than the set target current value (IA) when it is predicted that the voltage drop occurs.,下面是FUEL CELL SYSTEM专利的具体信息内容。
The disclosure relates to a fuel cell system.
In a fuel cell, in some cases, flooding occurs so that the moisture in the fuel cell blocks poles in electrodes and flow channels of separators. In such cases where a fuel cell is in such a flooded state, the output of the fuel cell may decrease due to the occurrence of an abrupt voltage drop in a high current region. In order to suppress the occurrence of such a voltage drop, a technology is known which aims at resolving flooding by increasing the amount of cathode gas and hence promoting the drainage of water from a fuel cell (e.g., see Japanese Patent Application Publication No.
However, according to the technology of resolving flooding by increasing the amount of cathode gas, a predetermined time is required from a request to increase the amount of cathode gas to the resolution of flooding. In consequence, for example, when a request to increase the output of the fuel cell is made in the flooding state, the operation state of the fuel cell shifts to the high current region to cause a voltage drop before the resolution of flooding, and as a result, the output of the fuel cell may still decrease.
Besides, according to the known technology of estimating the degree of decrease in voltage and limiting the output of the motor, the degree of decrease in voltage at present is estimated based on an actually measured output voltage value of the fuel cell at present. Therefore, for example, when the operation state of the fuel cell shifts from a low current region to the high current region in a short period, the estimation of the degree of decrease in voltage cannot cope with the shift in the operation state of the fuel cell. As a result, the degree of decrease in voltage exceeds a degree to which it should be limited, so a voltage drop may occur in the high current region. In this case, the voltage may be controlled in such a manner as to return to a pre-voltage drop state, based on the later estimated degree of decrease in voltage. In such a case, the convergence performance of the output of the fuel cell may decrease.
It is therefore desired to provide a fuel cell system that is designed to suppress the decrease in the output of a fuel cell and the decrease in the convergence performance of the output.
The disclosure provides a fuel cell system that is equipped with a fuel cell, a setting unit, an output control unit, a prediction unit, and a resetting unit. The setting unit is configured to set a target current value of the fuel cell based on an output request for the fuel cell. The output control unit is configured to control an output current value of the fuel cell from a low current region to a high current region, based on the set target current value. The prediction unit is configured to predict, based on an output voltage value of the fuel cell in the low current region, that a voltage drop of the fuel cell occurs in the high current region, when the output current value of the fuel cell is in the low current region and the target current value is above a current threshold that is set in the high current region. The resetting unit is configured to reset the target current value to a current value that is smaller than the set target current value when it is predicted that the voltage drop occurs.
The output voltage value of the fuel cell in the low current region is correlated with a humidity state of the fuel cell, and the humidity state is correlated with the occurrence of a voltage drop in the high current region. Therefore, the occurrence of a voltage drop in the high current region can be predicted in advance, based on the output voltage value of the fuel cell in the low current region. Accordingly, when it is predicted that a voltage drop occurs, the target current value is reset to the low current value. Therefore, the occurrence of a voltage drop is suppressed, and the decrease in the output of the fuel cell is suppressed. Besides, the occurrence of a voltage drop in the high current region is predicted in advance, so the occurrence of a voltage drop can be suppressed in advance. Therefore, even when the operation state of the fuel cell shifts from the low current region to the high current region in a short period, the decrease in the convergence performance of the output of the fuel cell is suppressed.
The prediction unit can predict that the voltage drop occurs when the output voltage value of the fuel cell at a predetermined current value in the low current region is above a voltage threshold. Thus, the voltage drop can be predicted by a simple method.
The fuel cell system can be equipped with a storage unit, a characteristic estimation unit, a determination unit, and an update unit. The current threshold and the voltage threshold are stored in the storage unit. The characteristic estimation unit is configured to estimate a current-voltage characteristic of the fuel cell. The determination unit is configured to determine, based on the estimated current-voltage characteristic, whether or not a performance of the fuel cell has decreased. The update unit is configured to update at least one of the current threshold and the voltage threshold that are stored in the storage unit, based on the estimated current-voltage characteristic, when it is determined that the performance of the fuel cell has decreased. Thus, the decrease in the output of the fuel cell and the decrease in the convergence performance of the output are suppressed in such a manner as to cope with the decrease in the performance of the fuel cell over time.
A fuel cell system that is designed to suppress the decrease in the output of a fuel cell and the decrease in the convergence performance of the output can be provided.
Features, advantages, and technical and industrial significance of an exemplary embodiment of the disclosure will be described below with reference to the accompanying drawings, in which like numerals denote like elements, and wherein:
The fuel cell 20 is of a solid polyelectrolyte type, and is equipped with a stack structure in which a multitude of single cells (cells) are stacked on one another. Each of the single cells of the fuel cell 20 has a cathode electrode (an air electrode) and an anode electrode (a fuel electrode). The cathode electrode is on one face of an ion-exchange membrane made of an electrolyte, and the anode electrode is on the other face thereof. For an electrode including the cathode electrode and the anode electrode, for example, platinum Pt is used as a catalyst (an electrode catalyst) with a porous carbon material serving as a base. A cathode-side gas diffusion layer is arranged on a surface of the cathode electrode. In the same way an anode-side gas diffusion layer is arranged on a surface of the anode electrode. Furthermore, a pair of separators are provided in such a manner as to sandwich the cathode-side gas diffusion layer and the anode-side gas diffusion layer from both sides. Fuel gas is supplied to a fuel gas flow channel of one of the separators, and oxidant gas is supplied to an oxidant gas flow channel of the other separator, so the fuel cell 20 generates electric power.
The fuel cell 20 is provided with a current sensor 2a configured to detect an output current, a voltage sensor 2b configured to detect an output voltage, and a temperature sensor 2c configured to detect a temperature of the fuel cell 20.
The oxidant gas piping system 30 has an air compressor 31, an oxidant gas supply channel 32, a humidification module 33, a cathode off-gas flow channel 34, and a motor M1 that drives the air compressor 31.
The air compressor 31 is driven by the motor M1, compresses air containing oxygen (oxidant gas) taken in from outside air, and supplies this oxidant gas to the cathode electrode of the fuel cell 20. The motor M1 is provided with a rotational speed detection sensor 3a configured to detect a rotational speed thereof. The oxidant gas supply channel 32 enables to introduce the oxygen supplied from the air compressor 31, to the cathode electrode of the fuel cell 20. Cathode off-gas is discharged from the cathode electrode of the fuel cell 20 via the cathode off-gas flow channel 34.
The humidification module 33 exchange moisture between low-humidity oxidant gas flowing through the oxidant gas supply channel 32, and high-humidity cathode off-gas flowing through the cathode off-gas flow channel 34, and appropriately humidifies the oxidant gas supplied to the fuel cell 20. The cathode off-gas flow channel 34 enables to discharge cathode off-gas to the outside of the system, and a back pressure adjusting valve A1 is disposed in the vicinity of an outlet of the cathode electrode. The pressure of the oxidant gas discharged from the fuel cell 20, namely, a cathode back pressure is adjusted by the back pressure adjusting valve A1. A pressure sensor 3b that detects the cathode back pressure is provided between the fuel cell 20 and the back pressure adjusting valve A1 in the cathode off-gas flow channel 34.
The fuel gas piping system 40 has a fuel gas supply source 41, a fuel gas supply channel 42, a fuel gas circulation channel 43, an anode off-gas flow channel 44, a hydrogen circulation pump 45, a gas-liquid separator 46, and a motor M2 for driving the hydrogen circulation pump 45.
The fuel gas supply source 41 is a tank for supplying the fuel cell 20 with hydrogen gas as fuel gas. The fuel gas supply channel 42 enables to introduce the fuel gas discharged from the fuel gas supply source 41, to the anode electrode of the fuel cell 20. A tank valve H1, a hydrogen supply valve H2, and an FC inlet valve H3 are disposed in this order from an upstream side in the fuel gas supply channel 42. These valves are electromagnetic valves that supply fuel gas to the fuel cell 20 and stop the supply of fuel gas thereto.
The fuel gas circulation channel 43 enables to recirculate unreacted fuel gas to the fuel cell 20. The gas-liquid separator 46, the hydrogen circulation pump 45, and a check valve (not shown) are disposed in this order from the upstream side in the fuel gas circulation channel 43, i.e. the gas-liquid separator 46 is upstream and the check valve is downstream while the hydrogen circulation pump 45 is in-between these two elements. The unreacted fuel gas discharged from the fuel cell 20 is appropriately pressurized by the hydrogen circulation pump 45, and is introduced to the fuel gas supply channel 42. Fuel gas is restrained from flowing backward from the fuel gas supply channel 42 to the fuel gas circulation channel 43, by the check valve. The anode off-gas flow channel 44 enables to discharge anode off-gas containing the hydrogen off-gas discharged from the fuel cell 20 and the water stored in the gas-liquid separator 46, to the outside of the system. An exhaust/drain valve H5 is disposed in the anode off-gas flow channel 44.
The electric power system 50 is equipped with a high-voltage DC/DC converter 51, a battery 52, a traction inverter 53, an auxiliary inverter 54, a traction motor M3, and an auxiliary motor M4.
The high-voltage DC/DC converter 51 can adjust a DC voltage from the battery 52 and output the adjusted DC voltage to the traction inverter 53 side. Also, the high-voltage DC/DC converter 51 can adjust a DC voltage from the fuel cell 20 or a voltage from the traction motor M3 that has been converted into a DC voltage by the traction inverter 53, and output the adjusted DC voltage to the battery 52. The output voltage of the fuel cell 20 is controlled by the high-voltage DC/DC converter 51.
The battery 52 is a rechargeable secondary battery, and can be charged with surplus electric power and supply supplementary electric power. The voltage of part of the DC electric power generated by the fuel cell 20 is boosted and lowered by the high-voltage DC/DC converter 51, and the battery 52 is charged therewith. The battery 52 is provided with an SOC sensor 5a that detects a state of charge thereof.
The traction inverter 53 and the auxiliary inverter 54 convert a DC electric power output from the fuel cell 20 or the battery 52 into a three-phase AC electric power, and supply the traction motor M3 and the auxiliary motor M4 therewith. The traction motor M3 drives wheels 71 and 72. The traction motor M3 is provided with a rotational speed detection sensor 5b that detects a rotational speed thereof. The auxiliary motor M4 is a motor for driving various auxiliaries, and is a general term for the motors M1 and M2.
The control unit 60 includes a CPU, a ROM and a RAM, and controls respective components of the system based on signals of respective sensors input to the control unit 60. More specifically, the control unit 60 determines whether or not there is an output request for the fuel cell 20, based on respective sensor signals delivered from an accelerator pedal sensor 81 that detects the turning of an accelerator pedal 80, the SOC sensor 5a and the rotational speed detection sensor 5b, and calculates a target output value. The control unit 60 sets a target current value of the fuel cell 20 based on a current-output curve (an IP curve) that will be described later.
The control unit 60 controls the fuel cell 20 from a low current region to a high current region such that this output current value is output. The control unit 60 controls the output pulses of the traction inverter 53 and the auxiliary inverter 54, and controls the traction motor M3, the auxiliary motor M4 and the like.
It should be noted herein that in a certain humidity state, the fuel cell 20 may not be able to output a desired required output due to a voltage drop resulting from an increase in gas diffusion resistance in the high current region. In the present embodiment of the disclosure, the control unit 60 performs voltage drop suppression control for suppressing the occurrence of a voltage drop of the fuel cell 20. Besides, the control unit 60 performs update control in which a decrease in performance of the fuel cell 20 over time is taken into account. These kinds of control are performed by a setting unit, an output control unit, a prediction unit, a resetting unit, a storage unit, a characteristic estimation unit, a determination unit and an update unit, which are functionally realized by the CPU, the ROM and the RAM. Before describing these kinds of control, a current-voltage characteristic (an IV characteristic) of the fuel cell 20 and a voltage drop in the high current region will be described.
The activation overvoltage, the resistance overvoltage and the concentration overvoltage increase in the low current region, an intermediate current region and the high current region of the output current of the fuel cell 20 respectively. The low current region is a region in which the voltage decreases under the greatest influence of the activation overvoltage among the activation overvoltage, the resistance overvoltage and the concentration overvoltage. The intermediate current region is a region in which the voltage decreases under the greatest influence of the resistance overvoltage. The high current region is a region in which the voltage decreases under the greatest influence of the concentration overvoltage. For example, the low current region is a former-half region occupying about a quarter of the entire current region in which the fuel cell 20 can output current. The high current region is a latter-half region occupying about a quarter of the entire current region. The intermediate current region is a region occupying about a half of the entire current region with the low current region and the high current region excluded. As shown in
Next, the voltage drop of the fuel cell 20 will be described.
The IV curve C is an ideal IV curve on which the voltage drop (the third voltage drop) resulting from an increase in concentration overvoltage in the high current region does not occur even when a shift is made from the low current region to the high current region while the electrolyte membrane of the fuel cell 20 is in a humidity state of good humidity. Good humidity is a state where the electrolyte membrane is moderately humid, the proton shift resistance is small, and flooding or the like has not occurred. The IV curve C1 is an IV curve in the case where the voltage drops when a shift is made from the low current region to the high current region in a high humidity state where the amount of moisture in the fuel cell 20 is large. The IV curve C2 is an IV curve in the case where the voltage drastically drops in the high current region when a shift is made from the low current region to the high current region in an excessively humidified state where the amount of moisture in the fuel cell 20 is larger.
As shown in
Next, voltage drop suppression control for suppressing such a voltage drop in the high current region will be described.
Voltage drop suppression control is repeatedly performed at intervals of a predetermined time. First of all, the control unit 60 determines, based on an output value from the current sensor 2a, whether or not the output current value of the fuel cell 20 is in the low current region and below a current reference value IKL (step S1). The current reference value IKL is a predetermined current value in the low current region, and is set to a value that is larger than an output current value ID in an idling operation state of the fuel cell 20. If the result of the determination is affirmative, the control unit 60 determines whether or not there is an output increase request for the fuel cell 20 (step S2). If the result of the determination in one of steps S1 and S2 is negative, the control unit 60 ends the present control.
If the result of the determination in step S2 is affirmative, the control unit 60 sets a target current value corresponding to a target output value requested of the fuel cell 20 (step S3). In concrete terms, the control unit 60 sets the target current value corresponding to the target output value on the IP curve E shown in
The control unit 60 starts increasing the output of the fuel cell 20 such that the output current value of the fuel cell 20 reaches the target current value (step S4). Subsequently, the control unit 60 determines whether or not the target current value is above the current threshold IKH (step S5). The current threshold IKH is stored in the ROM of the control unit 60 and set in the high current region. If the result of the determination is negative, the control unit 60 ends the present control.
If the result of the determination in step S5 is affirmative, the control unit 60 acquires an output voltage value of the fuel cell 20 in the low current region (step S6). In concrete terms, the output voltage value of the fuel cell 20 in the case where the output current value detected by the current sensor 2a has reached the current reference value IKL set in the low current region is acquired as the output voltage value in the low current region. The output starts to be increased after the target current value is set as described previously. Therefore, the output voltage value in the low current region is acquired within a short period after the target current value is set.
Subsequently, the control unit 60 predicts, based on the acquired output voltage value in the low current region, whether or not the voltage drop (the third voltage drop) resulting from an increase in concentration overvoltage in the high current region occurs (step S7). More specifically, if the acquired output voltage value is below a voltage threshold VK, it is estimated that the humidity state is good or that the humidity is low, and it is predicted that the voltage drop resulting from an increase in concentration overvoltage does not occur in the high current region. If the acquired output voltage value is above the voltage threshold VK, then it is estimated that the humidity is high, and it is predicted in advance that the third voltage drop occurs in the high current region. This is because, as described previously, as the output voltage value in the low current region rises, the amount of moisture in the fuel cell 20 is considered to increase, and the voltage drop in the high current region is likely to increase. Besides, the occurrence of the third voltage drop can be predicted in advance by a simple method in which the output voltage value in the low current region and the voltage threshold VK are thus used. The voltage threshold VK is set in the low current region and stored in the ROM in advance. The voltage threshold VK is prescribed based on the IV curve C, and is a voltage value on the IV curve C at the current reference value IKL. However, the voltage threshold VK can be a value slightly larger than this voltage value. In this manner, the occurrence of the third voltage drop is predicted based on the output voltage value corresponding to a current value in the low current region that is larger than the output current value ID in an idling operation state. Indeed, the difference in output voltage value is small and the accuracy of prediction can decrease in an idling operation state even when the humidity state is different. Besides, the occurrence of the third voltage drop can be predicted at an early stage before the output current value of the fuel cell 20 reaches at least the high current region, by predicting the occurrence of the third voltage drop based on the output voltage value in the low current region.
If it is predicted in step S7 that the third voltage drop in the high current region occurs, the control unit 60 executes a target current value resetting process for resetting the target current value to a current value that is smaller than the set target current value (step S8). In this manner, the occurrence of the voltage drop is predicted in advance, and the target current value is reset to a current value that is smaller than the target current value. Thus, the occurrence of the third voltage drop is suppressed in advance. Accordingly, the decrease in the output of the fuel cell 20 is also suppressed. Besides, even when the operation state of the fuel cell 20 shifts from the low current region to the high current region in a short period, the decrease in the convergence performance of the output of the fuel cell 20 is suppressed.
Incidentally, in step S7, the occurrence or non-occurrence of the third voltage drop is predicted depending on whether or not the acquired output voltage value is above the voltage threshold VK, but the disclosure is not limited thereto. For example, it is also appropriate to predict that the third voltage drop occurs, when the rate of decrease in output voltage value per unit current (increase amount) in the low current region is smaller than a predetermined threshold. Besides, it is also appropriate to predict that the third voltage drop occurs, when the difference between a maximum value of the output voltage value and a minimum value of the output voltage value between a first predetermined current value and a second predetermined current value that is larger than the first predetermined current value is smaller than a predetermined threshold in the low current region. It is also appropriate to predict that the third voltage drop occurs, when a value obtained by integrating the output voltage value by the output current value between a third predetermined current value and a fourth predetermined current value that is larger than the third predetermined current value is larger than a predetermined threshold in the low current region.
In the aforementioned voltage drop suppression control, the processing of step S3 is an exemplary process executed by the setting unit that sets the target current value of the fuel cell 20 based on the output request for the fuel cell 20. The processing of step S4 is an exemplary process executed by the output control unit that controls the output current value of the fuel cell 20 from the low current region to the high current region in accordance with the target current value. The processing of step S7 is an exemplary process executed by the prediction unit that predicts that the third voltage drop of the fuel cell 20 occurs in the high current region, based on the output voltage value of the fuel cell 20 in the low current region, when the output current value of the fuel cell 20 is in the low current region and the target current value is above the current threshold set in the high current region. The processing of step S8 is an exemplary process executed by the resetting unit that resets the target current value to a current value that is smaller than the set target current value when it is predicted that the third voltage drop occurs.
Next, a target current value resetting process will be described.
Subsequently, the control unit 60 determines whether or not there is an identical output operating point that is the same as the target output value on the specified IV curve (step S12). If the result of the determination is affirmative, the control unit 60 resets the target current value to a current value at the identical output operating point (step S13). Thus, the output of the fuel cell 20 can be secured while suppressing the third voltage drop.
If the result of the determination in step S12 is negative, the control unit 60 resets the target current value to a current value at a maximum output operating point at which the output on the specified IV curve is maximized (step S 14). Thus, the decrease in the output of the fuel cell 20 can be suppressed to the minimum while suppressing the third voltage drop.
Incidentally, as shown in
Incidentally, the disclosure is not limited to the case where the target current value is reset to the current value at the identical output operating point or the current value at the maximum output operating point on the specified IV curve. It is sufficient to reset the target current value to a current value that is smaller than the initial target current value. For example, the target current value can be reset to the same current value as the current threshold IKH, or can be reset to a current value that is smaller than the target current value. Besides, the target current value can be reset to a current value from the center of the intermediate current region to the high current region. This is because the third voltage drop in the high current region can be suppressed even in this case, and the output of the fuel cell 20 can be secured more often than when the third voltage drop occurs. Besides, the current threshold IKH can be set to a minimum current value in the high current region.
By the way, the continuous use of the fuel cell 20 can lead to, for example, changes in the catalysts and the electrolyte membranes over time, and the output voltage of the fuel cell 20 can decrease. After the performance has decreased, the IV characteristic and the IP characteristic deteriorate in all the operation states of the fuel cell 20. Thus, when the occurrence of the third voltage drop of the fuel cell 20 is predicted based on the aforementioned voltage threshold VK and the aforementioned current threshold IKH even after the decrease in performance, the voltage threshold VK and the current threshold IKH do not correspond to the fuel cell 20 after the decrease in performance. Therefore, the accuracy of prediction can decrease. Thus, the control unit 60 performs update control for updating information on the performance of the fuel cell 20 including the voltage threshold VK and the current threshold IKH.
Next, update control for updating information on the performance of the fuel cell 20 will be described.
Update control is repeatedly performed at intervals of a predetermined time. First of all, the control unit 60 determines whether or not a timing for detecting a decrease in the performance of the fuel cell 20 has arrived (step S21). If the result of the determination is negative, the control unit 60 ends the present control. If the result of the determination is affirmative, the control unit 60 detects a plurality of output current values of the fuel cell 20, and a plurality of output voltage values corresponding to the plurality of the output current values respectively (step S22). The control unit 60 estimates an IV characteristic of the fuel cell 20 based on a result of detection (step S23). By comparing the estimated IV characteristic with the IV characteristic stored in advance in the ROM, the control unit 60 determines whether or not the performance of the fuel cell 20 has decreased (step S24). If the result of the determination is negative, the control unit 60 ends the present control.
If the result of the determination in step S24 is affirmative, the control unit 60 updates the information on performance stored in advance in the ROM before the decrease in performance to the information on performance after the decrease in performance, in accordance with the degree of decrease in the performance of the fuel cell 20 (step S25). The information on performance before the decrease in performance and the information on performance after the decrease in performance are calculated in advance through an experiment to be stored into the ROM. The information on performance includes the IV curve, the IP curve, the iso-output curve, the current threshold and the voltage threshold. The information on performance for each degree of decrease in performance is stored in the ROM. The IV curve, the IP curve, the iso-output curve, the current threshold and the voltage threshold are associated with one another.
For example, an IV characteristic in the case where flooding does not occur in the high current region of the fuel cell 20 is estimated based on the plurality of the detected output current values and the plurality of the detected output voltage values. In the case where the performance has not decreased, the estimated IV characteristic is substantially the same as the IV curve C stored in advance in the ROM. In the case where the performance has decreased, the estimated IV characteristic is close to one of the IV curves Ca to Cc in the map of
As described above, the information on performance after the decrease in performance is updated, and the aforementioned voltage drop suppression control is performed based on the information on performance. Therefore, the voltage drop can be appropriately suppressed after the decrease in performance as well. Specifically, the IV curve, the voltage threshold and the current threshold are updated. Thus, after the decrease in performance as well, the occurrence of the voltage drop can be accurately predicted, and the voltage drop can be suppressed. Furthermore, by updating the iso-output curve, the decrease in the output of the fuel cell 20 in suppressing the voltage drop can be suppressed even after the decrease in performance.
Incidentally, in the aforementioned embodiment of the disclosure, both the voltage threshold VK and the current threshold IKH are updated as the performance decreases. However, only one of the voltage threshold VK and the current threshold IKH can be updated without updating the other. For example, when the degree of decrease in the voltage of the fuel cell 20 in the low current region is small and the degree of decrease in the voltage of the fuel cell 20 in the high current region is large as a result of a decrease in performance, only the current threshold IKH can be updated.
In the aforementioned update control, the processing of step S23 is an exemplary process executed by the characteristic estimation unit that estimates the current-voltage characteristic of the fuel cell 20. The processing of step S24 is an exemplary process executed by the determination unit that determines, based on the estimated current-voltage characteristic, whether or not the performance of the fuel cell 20 has decreased. The processing of step S25 is an exemplary process executed by the update unit that updates at least one of the current threshold and the voltage threshold, which are stored in the ROM, based on the estimated current-voltage characteristic, when it is determined that the performance of the fuel cell 20 has decreased.
Incidentally, as shown in
Although the preferred embodiment of the disclosure has been described hereinabove in detail, the disclosure should not be limited to this specific embodiment thereof, but can be modified or altered in various manners without departing from the scope of the disclosure.
标题 | 发布/更新时间 | 阅读量 |
---|---|---|
一种燃料电池电堆膜电极串漏检测方法 | 2020-05-08 | 739 |
一种燃料电池发电系统 | 2020-05-08 | 406 |
一种带能量回收利用的燃料电池 | 2020-05-08 | 766 |
一种燃料电池膜电极性能测试方法 | 2020-05-08 | 384 |
一种燃料电池电堆的水管理方法 | 2020-05-08 | 324 |
一种可弯曲微流体无膜燃料电池 | 2020-05-08 | 941 |
金属燃料电池结构 | 2020-05-08 | 739 |
一种增程式电动车动力系统 | 2020-05-11 | 700 |
一种液氢气化冷量回收发电装置 | 2020-05-11 | 764 |
一种风冷型燃料电池金属双极板 | 2020-05-08 | 601 |
高效检索全球专利专利汇是专利免费检索,专利查询,专利分析-国家发明专利查询检索分析平台,是提供专利分析,专利查询,专利检索等数据服务功能的知识产权数据服务商。
我们的产品包含105个国家的1.26亿组数据,免费查、免费专利分析。
专利汇分析报告产品可以对行业情报数据进行梳理分析,涉及维度包括行业专利基本状况分析、地域分析、技术分析、发明人分析、申请人分析、专利权人分析、失效分析、核心专利分析、法律分析、研发重点分析、企业专利处境分析、技术处境分析、专利寿命分析、企业定位分析、引证分析等超过60个分析角度,系统通过AI智能系统对图表进行解读,只需1分钟,一键生成行业专利分析报告。