CN216850013U - Fuel cell monolithic consistency evaluation device and automobile - Google Patents
Fuel cell monolithic consistency evaluation device and automobile Download PDFInfo
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- CN216850013U CN216850013U CN202220511559.0U CN202220511559U CN216850013U CN 216850013 U CN216850013 U CN 216850013U CN 202220511559 U CN202220511559 U CN 202220511559U CN 216850013 U CN216850013 U CN 216850013U
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Abstract
The utility model provides a fuel cell monolithic uniformity evaluation device and car, the device includes the fuel cell system, two-way DC converter, whole car power battery, shut down reserve battery and controller, the controller is used for when the fuel cell system is in the shutdown state, supply power to the fuel cell system through shutting down reserve battery, and control two-way DC converter and apply to the fuel cell system and predetermine the alternating current impedance value of each monolithic in the fuel cell system after the alternating current disturbance signal, and confirm the result of fuel cell monolithic uniformity evaluation based on each alternating current impedance value, realized accurate fuel cell monolithic uniformity evaluation of carrying on after the fuel cell system shuts down, and then more reliable monitors the fuel cell system.
Description
Technical Field
The utility model relates to a fuel cell system technical field especially relates to a fuel cell monolithic uniformity evaluation device and car.
Background
The performance of the fuel cell single sheets determines the output performance of the whole electric pile, and the performance difference among the single sheets causes the single sheet consistency problem of the electric pile.
In the prior art, a vehicle-mounted fuel cell system generally measures voltages of individual fuel cells of the fuel cell system during operation by a voltage inspection device, and calculates standard deviation, variance and the like of the voltages to evaluate consistency of the individual fuel cells. When the fuel cell system is stopped for a long time, this method cannot be used because there is no voltage.
Therefore, how to evaluate the consistency of the fuel cell single sheets after the shutdown of the fuel cell system is a technical problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a fuel cell monolithic uniformity evaluation device for solve among the prior art can't carry out the technical problem of fuel cell monolithic uniformity evaluation after fuel cell system shuts down. The device comprises a fuel cell system, a bidirectional DC/DC converter, a complete vehicle power battery, a shutdown standby battery and a controller, wherein,
the positive electrode and the negative electrode of the fuel cell system are respectively connected with the first end and the second end of the bidirectional DC/DC converter, the third end of the bidirectional DC/DC converter is connected with the positive electrode of the finished automobile power battery and the positive electrode of the shutdown standby battery, and the fourth end of the bidirectional DC/DC converter is connected with the negative electrode of the finished automobile power battery and the negative electrode of the shutdown standby battery;
the controller is used for supplying power to the fuel cell system through the shutdown standby battery when the fuel cell system is in a shutdown state, controlling the bidirectional DC/DC converter to apply a preset alternating current disturbance signal to the fuel cell system, determining an alternating current impedance value of each single chip in the fuel cell system, and determining a consistency evaluation result of the fuel cell single chips based on the alternating current impedance values.
In some embodiments of the present application, the device further includes a voltage inspection device and a current sensor, and the controller is specifically configured to:
after the bidirectional DC/DC converter is controlled to apply a preset alternating current disturbance signal to the fuel cell system, acquiring a first voltage signal of each single chip in the fuel cell system based on the voltage inspection device;
acquiring current signals of each single chip in the fuel cell system based on the current sensors;
and performing fast Fourier transform on the first voltage signal and the current signal, and determining each alternating current impedance value.
In some embodiments of the present application, the current sensor is disposed in the bidirectional DC/DC converter.
In some embodiments of the present application, the controller is further configured to:
when the fuel cell system is in an operating state, acquiring second voltage signals of each single chip in the fuel cell system based on the voltage inspection device;
and determining the result of the fuel cell single-chip consistency evaluation based on the standard deviation or the variance of each second voltage signal.
In some embodiments of the present application, the controller is specifically configured to:
determining a local anomaly factor for each of the AC impedance values based on a local anomaly factor algorithm;
and determining the result of the fuel cell single-sheet consistency evaluation based on the local abnormal factor of each alternating-current impedance value.
In some embodiments of the present application, the controller is specifically configured to:
and determining the result of the fuel cell single-sheet consistency evaluation based on the standard deviation or the variance of each alternating-current impedance value.
In some embodiments of the present application, the controller is further configured to:
and after determining the result of the fuel cell single-chip consistency evaluation in the shutdown state, sending an interrupt signal to the shutdown standby battery so as to enable the shutdown standby battery to stop supplying power to the fuel cell system.
In some embodiments of the present application, the controller determines that the fuel cell system enters a shutdown state according to a shutdown signal acquired from a vehicle control unit.
In some embodiments of the present application, the controller is an all-in-one controller.
Correspondingly, the utility model also provides an automobile, including as above the device.
By applying the technical scheme, the fuel cell monolithic consistency evaluation device comprises a fuel cell system, a bidirectional DC/DC converter, a finished automobile power cell, a shutdown standby battery and a controller, wherein the anode and the cathode of the fuel cell system are respectively connected with the first end and the second end of the bidirectional DC/DC converter, the third end of the bidirectional DC/DC converter is connected with the anode of the finished automobile power cell and the anode of the shutdown standby battery, and the fourth end of the bidirectional DC/DC converter is connected with the cathode of the finished automobile power cell and the cathode of the shutdown standby battery; the controller is used for supplying power to the fuel cell system through the shutdown standby battery when the fuel cell system is in a shutdown state, controlling the bidirectional DC/DC converter to apply a preset alternating current disturbance signal to the fuel cell system, determining the alternating current impedance value of each single chip in the fuel cell system, and determining the consistency evaluation result of the fuel cell single chips based on each alternating current impedance value, so that the consistency evaluation of the fuel cell single chips after the fuel cell system is shutdown is accurately carried out, and the fuel cell system is monitored more reliably.
The summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
Fig. 1 is a schematic structural diagram of a single-piece consistency evaluation device for a fuel cell according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for evaluating the consistency of a single fuel cell according to an embodiment of the present invention.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.
The embodiment of the application provides a fuel cell monolithic consistency evaluation device, as shown in fig. 1, the device comprises a fuel cell system FC, a bidirectional DC/DC converter, a whole vehicle power battery BAT1, a shutdown standby battery BAT2 and a controller, wherein,
the positive electrode and the negative electrode of the fuel cell system FC are respectively connected with the first end and the second end of the bidirectional DC/DC converter, the third end of the bidirectional DC/DC converter is connected with the positive electrode of the whole vehicle power battery BAT1 and the positive electrode of the shutdown standby battery BAT2, and the fourth end of the bidirectional DC/DC converter is connected with the negative electrode of the whole vehicle power battery BAT1 and the negative electrode of the shutdown standby battery BAT 2;
and the controller is used for supplying power to the fuel cell system FC through the shutdown standby battery BAT2 when the fuel cell system FC is in a shutdown state, controlling the bidirectional DC/DC converter to apply a preset alternating current disturbance signal to the fuel cell system FC, determining the alternating current impedance value of each single chip in the fuel cell system FC, and determining the consistency evaluation result of each single chip of the fuel cell based on each alternating current impedance value.
In this embodiment, the fuel cell system FC is an electrochemical reaction device, hydrogen and oxygen react at two sides of a proton exchange membrane inside a stack, and water is generated at an air side to convert chemical energy into electric energy, and the fuel cell system FC mainly includes a fuel cell stack, an air subsystem, a hydrogen subsystem, and a cooling subsystem.
The fuel cell monolithic consistency evaluation device comprises a whole vehicle power battery BAT1 and a shutdown standby battery BAT2, wherein the shutdown standby battery BAT2 can be a lithium battery or other types of batteries. The bidirectional DC/DC converter integrates the functions of bidirectional output, boosting, voltage reduction, alternating current disturbance and the like. However, the DC/DC converter in the prior art is unidirectional, and the DC/DC converter is not connected to the shutdown backup battery, so that the ac disturbance signal can be applied only when the fuel cell system is in an operating state, thereby obtaining the ac impedance value of the single chip.
In this embodiment, after the fuel cell system FC is shut down, the entire vehicle power battery BAT1 is in an un-awakened state, the controller wakes up the shutdown backup battery BAT2 to supply power to the fuel cell system FC, and controls the bidirectional DC/DC converter to apply a preset alternating current disturbance signal to the fuel cell system FC, and then the alternating current impedance value of each single chip in the fuel cell system FC can be determined, the result of the consistency evaluation of the fuel cell single chip can be determined based on each alternating current impedance value, the performance difference of each single chip in the fuel cell system FC can be determined according to the result of the consistency evaluation of the fuel cell single chip, and the single chip with abnormal performance can be detected.
It should be noted that, a specific process of controlling the bidirectional DC/DC converter to apply the preset ac perturbation signal to the fuel cell system FC is the prior art, and is not described herein again.
In order to reliably determine the ac impedance value of each individual cell in the fuel cell system FC, in some embodiments of the present application, the apparatus further includes a voltage polling device and a current sensor, and the controller is specifically configured to:
after the bidirectional DC/DC converter is controlled to apply a preset alternating current disturbance signal to the fuel cell system FC, acquiring a first voltage signal of each single chip in the fuel cell system FC based on a voltage inspection device;
acquiring current signals of each single chip in the fuel cell system FC based on the current sensor;
and performing fast Fourier transform on the first voltage signal and the current signal, and determining each alternating current impedance value.
In this embodiment, the controller controls the bidirectional DC/DC converter to apply a preset ac disturbance signal to the fuel cell system FC, after a value measured by the current sensor is stable, the voltage inspection device is started, the voltage inspection device acquires the first voltage signal of each chip in the fuel cell system FC, the current sensor acquires the current signal of each chip in the fuel cell system FC, then the fast fourier transform is performed on the first voltage signal and the current signal, and each ac impedance value is determined according to a result of the fast fourier transform.
It should be noted that, a specific process of performing fast fourier transform on the first voltage signal and the current signal is the prior art, and is not described herein again.
In order to reliably obtain the current signal of each single chip in the fuel cell system FC, in some embodiments of the present application, the current sensor is provided in the bidirectional DC/DC converter.
Those skilled in the art can also arrange the current sensor at other positions to accurately detect the current of each single chip, which does not affect the protection scope of the present application.
To ensure the reliability of the system, in some embodiments of the present application, the controller is further configured to:
when the fuel cell system FC is in the running state, acquiring second voltage signals of each single chip in the fuel cell system FC based on a voltage inspection device;
and determining the evaluation result of the single-cell consistency of the fuel cell based on the standard deviation or the variance of each second voltage signal.
In this embodiment, when the fuel cell system FC is in an operating state, the second voltage signals of the individual fuel cells in the fuel cell system FC are obtained based on the voltage inspection device, and then the standard deviation or variance of the second voltage signals is calculated, so as to obtain the result of the consistency evaluation of the individual fuel cells.
Optionally, when the fuel cell system FC is in the operating state, the bidirectional DC/DC converter is controlled to apply a preset ac disturbance signal to the fuel cell system FC, determine an ac impedance value of each single chip in the fuel cell system FC, and determine a result of the fuel cell single chip consistency evaluation based on the ac impedance value of each single chip.
It is understood that, when the fuel cell system FC is in an operating state, the shutdown backup battery BAT2 does not supply power to the fuel cell system FC.
In order to accurately perform the evaluation of the consistency of the fuel cell single chip, in some embodiments of the present application, the controller is specifically configured to:
determining local abnormal factors of the alternating current impedance values based on a local abnormal factor algorithm;
and determining the consistency evaluation result of the fuel cell single sheet based on the local abnormal factor of each alternating current impedance value.
In this embodiment, the local abnormal factor is specifically: the average density of the positions of the sample points around a sample point is higher than the density of the positions of the sample points. The more the ratio is greater than 1, the less the density of the location of the point is than the locations of the surrounding samples, and the more likely the point is an outlier. Therefore, the consistency can be judged by the degree that the abnormality factor of the on-chip ac impedance value is larger than 1.
Optionally, in some embodiments of the present application, the controller is specifically configured to:
the results of the fuel cell on-chip uniformity evaluation are determined based on the standard deviation or variance of each ac impedance value.
To improve the reliability of the system, in some embodiments of the present application, the controller is further configured to:
after determining the result of the fuel cell on-chip consistency evaluation in the shutdown state, an interrupt signal is sent to shutdown backup battery BAT2 to cause shutdown backup battery BAT2 to stop supplying power to fuel cell system FC.
In order to ensure the reliability of the system, in some embodiments of the present application, the controller determines that the fuel cell system FC enters the shutdown state according to a shutdown signal obtained from the vehicle control unit VCU, as shown in fig. 1.
To improve the reliability of the system, in some embodiments of the present application, the controller is an all-in-one controller.
In this embodiment, the all-in-one controller may include, but is not limited to, a multi-core control module, a low-voltage processing circuit module, a step-down DC/DC power driving module, a hydrogen pump driving module, a water pump driving module, an air compressor driving module, a step-up DC/DC and high-voltage power distribution module, and a functional safety module.
By applying the technical scheme, the fuel cell monolithic consistency evaluation device comprises a fuel cell system, a bidirectional DC/DC converter, a finished automobile power cell, a shutdown standby cell and a controller, wherein the anode and the cathode of the fuel cell system are respectively connected with the first end and the second end of the bidirectional DC/DC converter, the third end of the bidirectional DC/DC converter is connected with the anode of the finished automobile power cell and the anode of the shutdown standby cell, and the fourth end of the bidirectional DC/DC converter is connected with the cathode of the finished automobile power cell and the cathode of the shutdown standby cell; the controller is used for supplying power to the fuel cell system through the shutdown standby battery when the fuel cell system is in a shutdown state, controlling the bidirectional DC/DC converter to apply a preset alternating current disturbance signal to the fuel cell system, determining the alternating current impedance value of each single chip in the fuel cell system, and determining the consistency evaluation result of the fuel cell single chips based on each alternating current impedance value, so that the consistency evaluation of the fuel cell single chips after the fuel cell system is shutdown is accurately carried out, and the fuel cell system is monitored more reliably.
Corresponding to a fuel cell monolithic consistency evaluation device in the embodiments of the present application, the embodiments of the present application also propose a fuel cell monolithic consistency evaluation method applied to the device as described above, as shown in fig. 2, the method including the steps of:
step S101, when the fuel cell system is in a shutdown state, the shutdown standby battery supplies power to the fuel cell system;
step S102, controlling the bidirectional DC/DC converter to apply a preset alternating current disturbance signal to the fuel cell system and then determining the alternating current impedance value of each single chip in the fuel cell system;
step S103, determining the consistency evaluation result of the fuel cell single sheet based on each alternating current resistance value.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. The device for evaluating the consistency of the fuel cell single chip is characterized by comprising a fuel cell system, a bidirectional DC/DC converter, a whole vehicle power battery, a shutdown standby battery and a controller, wherein,
the positive electrode and the negative electrode of the fuel cell system are respectively connected with the first end and the second end of the bidirectional DC/DC converter, the third end of the bidirectional DC/DC converter is connected with the positive electrode of the finished automobile power battery and the positive electrode of the shutdown standby battery, and the fourth end of the bidirectional DC/DC converter is connected with the negative electrode of the finished automobile power battery and the negative electrode of the shutdown standby battery;
the controller is used for supplying power to the fuel cell system through the shutdown standby battery when the fuel cell system is in a shutdown state, controlling the bidirectional DC/DC converter to apply a preset alternating current disturbance signal to the fuel cell system, determining an alternating current impedance value of each single chip in the fuel cell system, and determining a consistency evaluation result of the fuel cell single chips based on the alternating current impedance values.
2. The device of claim 1, further comprising a voltage inspection device and a current sensor, the controller being specifically configured to:
after the bidirectional DC/DC converter is controlled to apply a preset alternating current disturbance signal to the fuel cell system, acquiring a first voltage signal of each single chip in the fuel cell system based on the voltage inspection device;
acquiring current signals of each single chip in the fuel cell system based on the current sensors;
and performing fast Fourier transform on the first voltage signal and the current signal, and determining each alternating current impedance value.
3. The apparatus of claim 2, wherein the current sensor is disposed in the bidirectional DC/DC converter.
4. The apparatus of claim 2, wherein the controller is further to:
when the fuel cell system is in an operating state, acquiring second voltage signals of each single chip in the fuel cell system based on the voltage inspection device;
and determining the result of the fuel cell single-chip consistency evaluation based on the standard deviation or the variance of each second voltage signal.
5. The apparatus of claim 1, wherein the controller is specifically to:
determining a local anomaly factor for each of the AC impedance values based on a local anomaly factor algorithm;
and determining the result of the fuel cell single-sheet consistency evaluation based on the local abnormal factor of each alternating-current impedance value.
6. The apparatus of claim 1, wherein the controller is specifically to:
and determining the result of the fuel cell single-sheet consistency evaluation based on the standard deviation or the variance of each alternating-current impedance value.
7. The apparatus of claim 1, wherein the controller is further to:
and after determining the result of the fuel cell single-chip consistency evaluation in the shutdown state, sending an interrupt signal to the shutdown standby battery so as to enable the shutdown standby battery to stop supplying power to the fuel cell system.
8. The apparatus of claim 1, wherein the controller determines that the fuel cell system enters a shutdown state based on a shutdown signal obtained from a vehicle controller.
9. The apparatus of any one of claims 1-8, wherein the controller is an all-in-one controller.
10. A vehicle, characterized in that it comprises a device according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220511559.0U CN216850013U (en) | 2022-03-10 | 2022-03-10 | Fuel cell monolithic consistency evaluation device and automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220511559.0U CN216850013U (en) | 2022-03-10 | 2022-03-10 | Fuel cell monolithic consistency evaluation device and automobile |
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| CN216850013U true CN216850013U (en) | 2022-06-28 |
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