Shutdown discharge control method, device, vehicle and medium

Abstract

Embodiments of the present invention disclose a shutdown discharge control method, device, vehicle, and medium. The method is used in a hydrogen fuel cell system comprising a reactant gas module, a fuel cell stack, a DC-DC converter module, a voltage inspection module, and a control module. The method comprises: responding to a shutdown signal, controlling the reactant gas module to stop supplying reactant gas to the fuel cell stack; controlling the voltage inspection module to perform voltage detection on each chip in the fuel cell stack at a preset time interval to obtain the actual voltage value of each chip; determining whether to stop discharging based on the actual voltage value of each chip to obtain a determination result; if the determination result is yes, controlling the DC-DC converter module to stop discharging the fuel cell stack; if the determination result is no, determining a discharge current value based on the actual voltage value of each chip, and controlling the DC-DC converter module to discharge the fuel cell stack based on the discharge current value. This method avoids over-discharging or under-discharging, thereby improving the performance and life of the fuel cell stack.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a shutdown discharge control method, device, vehicle and medium. Background Art

[0002] When a hydrogen fuel cell system is shut down, the remaining charge in the stack must be completely discharged for safety reasons and to ensure it does not affect the performance and lifespan of the stack. During the stack discharge process, the reactant gas supply required by the hydrogen fuel cell system stops, and the stack can only maintain its charge through the residual reactant gas within the cavity. As the discharge progresses, the voltage of each chip varies significantly. Currently, the stack is discharged at a fixed current value through the DC-DC conversion module, which may result in over-discharge or under-discharge. If over-discharge occurs, the voltage of some individual chips will be very low. If under-discharge occurs, the stack will have a high residual charge for a long time. Both over-discharge and under-discharge will affect the performance, lifespan, and safety of the stack. Summary of the Invention

[0003] Based on this, it is necessary to propose a shutdown discharge control method, device, vehicle and medium to address the technical problem that when the hydrogen fuel cell system is shut down, the fuel cell stack is discharged at a fixed current value through the DCDC conversion module, which may cause excessive or insufficient discharge.

[0004] This application proposes a shutdown discharge control method for a hydrogen fuel cell system, which includes: a reaction gas module, a fuel cell stack, a DC-DC conversion module, a voltage inspection module, and a control module. The method includes:

[0005] Get the shutdown signal;

[0006] In response to the shutdown signal, controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack;

[0007] At preset time intervals, control the voltage inspection module to perform voltage detection on each cell in the stack to obtain the actual voltage value of each cell;

[0008] Determine whether to stop discharging according to the actual voltage value of each of the single chips, and obtain a determination result;

[0009] If the judgment result is yes, controlling the DCDC conversion module to stop discharging the battery stack;

[0010] If the judgment result is no, the discharge current value is determined according to the actual voltage value of each of the single chips, and the DCDC conversion module is controlled to discharge the battery stack according to the discharge current value.

[0011] Furthermore, the step of determining whether to stop discharging based on the actual voltage value of each of the single chips and obtaining a determination result includes:

[0012] Calculating the total voltage of the stack based on the actual voltage values ​​of each of the single chips to obtain the total voltage of the stack;

[0013] If the total voltage of the battery stack is less than a preset first threshold, the judgment result is determined to be yes; otherwise, the judgment result is determined to be no.

[0014] Furthermore, if the total voltage of the battery stack is lower than a preset first threshold, determining that the judgment result is yes, otherwise, determining that the judgment result is no, includes:

[0015] Find the smallest actual voltage value of the single chip from among the actual voltage values ​​of the single chip, and use it as the lowest voltage value of the single chip;

[0016] If the total voltage of the battery stack is less than the first threshold, or the minimum voltage value of the single chip is less than the preset second threshold, the judgment result is determined to be yes; otherwise, the judgment result is determined to be no.

[0017] Furthermore, the step of determining the discharge current value according to the actual voltage value of each of the single chips includes:

[0018] Calculating the mean difference based on the actual voltage values ​​of each of the single chips as the voltage mean difference;

[0019] Get the initial maximum discharge current;

[0020] The discharge current value is calculated according to the voltage deviation from the mean and the initial maximum discharge current.

[0021] Furthermore, the step of controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack in response to the shutdown signal includes:

[0022] In response to the shutdown signal, the reactive gas module is controlled to stop supplying reactive gas to the stack, and the voltage inspection module is controlled to perform voltage detection on each cell in the stack to obtain an initial voltage value of each cell;

[0023] Before the step of obtaining the initial maximum discharge current, the method further includes:

[0024] The initial maximum discharge current is determined according to the initial voltage value of each single chip.

[0025] Furthermore, the step of calculating the discharge current value according to the voltage deviation from the mean and the initial maximum discharge current includes:

[0026] Calculating a current value according to the voltage deviation from the mean and the initial maximum discharge current as the discharge current value;

[0027] The calculation formula i of the discharge current value is: i=i0-k×Vdep, i0 is the initial maximum discharge current, Vdep is the voltage deviation, and k is the preset discharge current decay rate.

[0028] Furthermore, the discharge current decay rate is a rate determined according to parameters of the battery stack.

[0029] The present application also proposes a shutdown discharge control device, which is used in a hydrogen fuel cell system. The hydrogen fuel cell system includes: a reaction gas module, a fuel cell stack, a DC / DC conversion module, a voltage inspection module, and a control module. The shutdown discharge control device is installed in the control module.

[0030] The shutdown discharge control device is used to obtain a shutdown signal; in response to the shutdown signal, control the reaction gas module to stop supplying reaction gas to the fuel cell stack; at a preset time interval, control the voltage inspection module to perform voltage detection on each chip in the fuel cell stack to obtain the actual voltage value of each single chip; judge whether to stop discharging based on the actual voltage value of each single chip to obtain a judgment result; if the judgment result is yes, control the DCDC conversion module to stop discharging the fuel cell stack; if the judgment result is no, determine the discharge current value based on the actual voltage value of each single chip, and control the DCDC conversion module to discharge the fuel cell stack based on the discharge current value.

[0031] The present application also proposes a vehicle, including a memory and a processor, wherein the memory stores a computer program. When the computer program is executed by the processor, the processor performs the following method. The method is used for a hydrogen fuel cell system, wherein the hydrogen fuel cell system includes: a reactant gas module, a fuel cell stack, a DC / DC conversion module, a voltage inspection module, and a control module. The method includes:

[0032] Get the shutdown signal;

[0033] In response to the shutdown signal, controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack;

[0034] At preset time intervals, control the voltage inspection module to perform voltage detection on each cell in the stack to obtain the actual voltage value of each cell;

[0035] Determine whether to stop discharging according to the actual voltage value of each of the single chips, and obtain a determination result;

[0036] If the judgment result is yes, controlling the DCDC conversion module to stop discharging the battery stack;

[0037] If the judgment result is no, the discharge current value is determined according to the actual voltage value of each of the single chips, and the DCDC conversion module is controlled to discharge the battery stack according to the discharge current value.

[0038] The present application also proposes a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor is caused to execute the following method. The method is used in a hydrogen fuel cell system, wherein the hydrogen fuel cell system includes: a reactant gas module, a fuel cell stack, a DC / DC conversion module, a voltage inspection module, and a control module. The method includes:

[0039] Get the shutdown signal;

[0040] In response to the shutdown signal, controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack;

[0041] At preset time intervals, control the voltage inspection module to perform voltage detection on each cell in the stack to obtain the actual voltage value of each cell;

[0042] Determine whether to stop discharging according to the actual voltage value of each of the single chips, and obtain a determination result;

[0043] If the judgment result is yes, controlling the DCDC conversion module to stop discharging the battery stack;

[0044] If the judgment result is no, the discharge current value is determined according to the actual voltage value of each of the single chips, and the DCDC conversion module is controlled to discharge the battery stack according to the discharge current value.

[0045] The shutdown discharge control method of the present application first determines whether to stop discharging based on the actual voltage values ​​of each of the single chips determined at a preset time interval, then stops discharging the battery stack when the judgment result is yes, and discharges the battery stack when the judgment result is no, thereby avoiding excessive or insufficient discharge; and determines the discharge current value based on the actual voltage values ​​of each of the single chips, and discharges the battery stack according to the discharge current value through the DCDC conversion module, thereby realizing discharge of the battery stack according to a dynamic current value, further avoiding excessive or insufficient discharge, and improving the performance and life of the battery stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] in:

[0048] Figure 1 Flowchart of a shutdown discharge control method in one embodiment;

[0049] Figure 2 is a structural block diagram of a hydrogen fuel cell system in one embodiment;

[0050] Figure 3 FIG. 1 is a structural block diagram of a vehicle in one embodiment. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0052] like Figure 1 As shown, in one embodiment, a shutdown discharge control method is provided, which is used in a hydrogen fuel cell system. The hydrogen fuel cell system includes: a reaction gas module, a fuel cell stack, a DCDC conversion module, a voltage inspection module and a control module.

[0053] A fuel cell stack is composed of multiple cells stacked in series, with bipolar plates and membrane electrodes alternately stacked. Seals are inserted between the cells, compressed by front and rear plates, and then secured with screws to form a fuel cell stack. During operation, hydrogen and oxygen are introduced through inlets, distributed through the stack's main gas channels to the bipolar plates of each cell, and then evenly distributed to the electrodes through the bipolar plates. The electrodes then contact the catalyst through the electrode supports for an electrochemical reaction.

[0054] The reaction gas module is used to provide reaction gas to the fuel cell stack.

[0055] The electricity generated by the battery stack is supplied to the vehicle's power system through the DCDC conversion module. The voltage inspection module is used to detect the voltage of each cell (that is, a single cell) in the battery stack.

[0056] The DCDC conversion module converts the DC power of a first voltage value input by the battery stack into DC power of a second voltage value, and the first voltage value is different from the second voltage value.

[0057] The control module, also known as FCU, is the fuel cell vehicle controller, which is used to control the coordinated work of the reaction gas module, fuel cell stack, DCDC conversion module and voltage patrol module.

[0058] The method comprises:

[0059] S1: Get the shutdown signal;

[0060] Specifically, a shutdown signal sent by a user or a shutdown signal sent by a third-party application may be obtained.

[0061] The shutdown signal is a signal to shut down the hydrogen fuel cell system.

[0062] S2: In response to the shutdown signal, controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack;

[0063] Specifically, when the shutdown signal is received, the reaction gas module is first controlled to stop supplying reaction gas to the fuel cell stack, thereby providing a basis for discharge.

[0064] S3: Controlling the voltage inspection module to perform voltage detection on each cell in the stack at a preset time interval to obtain an actual voltage value of each cell;

[0065] Specifically, the voltage inspection module is controlled to perform voltage detection on each cell in the stack at a preset time interval, and the voltage value detected on each cell is used as an actual voltage value of a single cell.

[0066] S4: determining whether to stop discharging according to the actual voltage values ​​of each of the single chips, and obtaining a determination result;

[0067] Specifically, whether to stop discharging is determined based on a preset stop discharging condition and the actual voltage value of each of the single chips. If the stop discharging condition is met, the determination result is yes; if the stop discharging condition is not met, the determination result is no.

[0068] S5: If the judgment result is yes, controlling the DCDC conversion module to stop discharging the battery stack;

[0069] Specifically, if the judgment result is yes, it means that continuing to discharge will cause over-discharge, and the discharge needs to be stopped at this time. Therefore, the DCDC conversion module is controlled to stop discharging the battery stack.

[0070] S6: If the judgment result is no, determining a discharge current value according to the actual voltage value of each of the single chips, and controlling the DCDC conversion module to discharge the battery stack according to the discharge current value.

[0071] Specifically, if the judgment result is no, it means that not continuing the discharge will result in insufficient discharge, and discharge needs to be continued at this time. Therefore, the discharge current value is first determined according to the preset discharge current value algorithm and the actual voltage value of each single chip, thereby realizing the dynamic determination of the discharge current value based on the actual voltage situation of each chip in the battery stack, so that the discharge current value meets the actual discharge requirements of the current battery stack; then, according to the discharge current value, the DCDC conversion module is controlled to discharge the battery stack, thereby avoiding insufficient discharge.

[0072] It is understandable that steps S3, S4 and S6 are repeatedly executed at preset time intervals until the judgment result is yes.

[0073] This embodiment first determines whether to stop discharging based on the actual voltage values ​​of each of the single chips determined at preset time intervals, then stops discharging the battery stack when the judgment result is yes, and discharges the battery stack when the judgment result is no, thereby avoiding excessive or insufficient discharge; and determines the discharge current value based on the actual voltage values ​​of each of the single chips, and discharges the battery stack according to the discharge current value through the DCDC conversion module, thereby achieving discharge of the battery stack according to a dynamic current value, further avoiding excessive or insufficient discharge, and improving the performance and life of the battery stack.

[0074] In one embodiment, the step of determining whether to stop discharging based on the actual voltage value of each of the single chips and obtaining the determination result includes:

[0075] S41: Calculating the total voltage of the stack according to the actual voltage values ​​of each of the single chips to obtain the total voltage of the stack;

[0076] Specifically, the total voltage calculation method is determined according to the connection relationship between the individual chips in the stack, the actual voltage value of each chip is substituted into the total voltage calculation method, and the calculated total voltage is used as the total voltage of the stack.

[0077] The total voltage of the battery stack is the total voltage of the electric energy output by the battery stack.

[0078] S42: If the total voltage of the battery stack is less than a preset first threshold, determine that the judgment result is yes; otherwise, determine that the judgment result is no.

[0079] Specifically, if the total voltage of the battery stack is less than the preset first threshold, it means that continuing to discharge will lead to excessive discharge, so the judgment result is determined to be yes; if the total voltage of the battery stack is greater than or equal to the preset first threshold, it means that not continuing to discharge will lead to insufficient discharge, so the judgment result is determined to be no.

[0080] In this embodiment, the judgment result is determined to be yes when the total voltage of the battery stack is less than a preset first threshold value, thereby avoiding excessive discharge; and the judgment result is determined to be no if the total voltage of the battery stack is greater than or equal to the preset first threshold value, thereby avoiding insufficient discharge.

[0081] In one embodiment, if the total voltage of the battery stack is lower than a preset first threshold, determining that the judgment result is yes, otherwise, determining that the judgment result is no, includes:

[0082] S421: Find the smallest actual voltage value of the single chip from among the actual voltage values ​​of the single chip, and use it as the lowest voltage value of the single chip;

[0083] Specifically, the single chip actual voltage value with the smallest value is found from the single chip actual voltage values, and the found single chip actual voltage value is used as the single chip minimum voltage value.

[0084] S422: If the total voltage of the battery stack is less than the first threshold, or the minimum voltage value of the single chip is less than a preset second threshold, then the judgment result is determined to be yes; otherwise, then the judgment result is determined to be no.

[0085] Specifically, if the total voltage of the fuel cell stack is less than the first threshold value, or the minimum voltage value of the single chip is less than the preset second threshold value, this means that continuing to discharge will lead to excessive discharge, and therefore, the judgment result is determined to be yes; if the total voltage of the fuel cell stack is greater than or equal to the first threshold value, and the minimum voltage value of the single chip is greater than or equal to the preset second threshold value, this means that not continuing to discharge will lead to insufficient discharge, and therefore, the judgment result is determined to be no.

[0086] In this embodiment, the judgment result is determined to be yes when the total voltage of the battery stack is less than a preset first threshold value, thereby avoiding excessive discharge; the judgment result is determined to be no if the total voltage of the battery stack is greater than or equal to the preset first threshold value, thereby avoiding insufficient discharge; and the discharge stopping condition is determined according to the total voltage of the battery stack and the minimum voltage value of the single chip, thereby improving the accuracy of the determined judgment result.

[0087] In one embodiment, the step of determining the discharge current value based on the actual voltage value of each of the single chips includes:

[0088] S61: Calculating a mean difference based on the actual voltage values ​​of each of the single chips as the voltage mean difference;

[0089] Specifically, a preset deviation from the mean calculation algorithm is used to calculate the deviation from the mean according to the actual voltage value of each of the single chips, and the calculated data is used as the voltage deviation from the mean.

[0090] Deviation from the mean defines individual differences as the distance between an individual and the group mean.

[0091] S62: Obtaining the initial maximum discharge current;

[0092] Specifically, the initial maximum discharge current may be a preset fixed value.

[0093] S63: Calculating the discharge current value according to the voltage deviation from the mean and the initial maximum discharge current.

[0094] Specifically, a preset discharge current value algorithm is used to calculate the discharge current value according to the voltage deviation from the mean and the initial maximum discharge current.

[0095] This embodiment calculates the discharge current value based on the voltage deviation from the mean and the initial maximum discharge current, thereby dynamically determining the discharge current value, providing a basis for discharging the battery stack according to the dynamic current value.

[0096] In one embodiment, the step of controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack in response to the shutdown signal includes:

[0097] S21: In response to the shutdown signal, controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack, and controlling the voltage inspection module to perform voltage detection on each cell in the fuel cell stack to obtain an initial voltage value of each cell;

[0098] Specifically, when the shutdown signal is received, the reaction gas module is controlled to stop supplying reaction gas to the fuel cell stack. When the supply of reaction gas to the fuel cell stack is stopped, the voltage inspection module is controlled to perform voltage detection on each chip in the fuel cell stack, and the voltage value obtained from the detection of each chip is used as an initial voltage value of a single chip.

[0099] Before the step of obtaining the initial maximum discharge current, the method further includes:

[0100] S621: Determine the initial maximum discharge current according to the initial voltage value of each single chip.

[0101] Specifically, the maximum discharge current calculation method is determined according to the connection relationship between the individual chips in the battery stack, the initial voltage value of each chip is substituted into the maximum discharge current calculation method, and the calculated current is used as the initial maximum discharge current.

[0102] This embodiment determines the initial maximum discharge current based on the initial voltage value of each single chip, so that the initial maximum discharge current conforms to the actual situation of the battery stack, realizes dynamic determination of the initial maximum discharge current, and provides a basis for accurately discharging the battery stack.

[0103] In one embodiment, the step of calculating the discharge current value based on the voltage deviation from the mean and the initial maximum discharge current includes:

[0104] S631: Calculating a current value according to the voltage deviation from the mean and the initial maximum discharge current as the discharge current value;

[0105] The calculation formula i of the discharge current value is: i=i0-k×Vdep, i0 is the initial maximum discharge current, Vdep is the voltage deviation, and k is the preset discharge current decay rate.

[0106] Optionally, the discharge current decay rate is a preset fixed value. The discharge current decay rate is a value greater than 0.

[0107] In this embodiment, the greater the voltage deviation from the mean, the smaller the discharge current value, thereby achieving discharge of the battery stack with a gradually decreasing current value, which is in line with the attenuation trend of the battery stack and further avoids excessive or insufficient discharge.

[0108] In one embodiment, the discharge current decay rate is a rate determined according to parameters of the fuel cell stack.

[0109] This embodiment determines the rate according to the parameters of the fuel cell stack and adds the external discharge current decay rate, so that the discharge current decay rate conforms to the actual decay rate of the fuel cell stack, providing a basis for making the discharge current value inversely proportional to the actual decay rate of the fuel cell stack.

[0110] like Figure 2 As shown, the present application also proposes a shutdown discharge control device 8051, which is used in a hydrogen fuel cell system. The hydrogen fuel cell system includes: a reaction gas module 801, a fuel cell stack 802, a DCDC conversion module 803, a voltage inspection module 804 and a control module 805, and the control module 805 is loaded with the shutdown discharge control device 8051;

[0111] The shutdown discharge control device 8051 is used to obtain a shutdown signal; in response to the shutdown signal, control the reaction gas module 801 to stop supplying reaction gas to the battery stack 802; according to a preset time interval, control the voltage inspection module 804 to perform voltage detection on each chip in the battery stack 802 to obtain the actual voltage value of each single chip; judge whether to stop discharging based on the actual voltage value of each single chip to obtain a judgment result; if the judgment result is yes, control the DCDC conversion module 803 to stop discharging the battery stack 802; if the judgment result is no, determine the discharge current value based on the actual voltage value of each single chip, and control the DCDC conversion module 803 to discharge the battery stack 802 based on the discharge current value.

[0112] This embodiment first determines whether to stop discharging based on the actual voltage values ​​of each of the single chips determined at preset time intervals, then stops discharging the battery stack when the judgment result is yes, and discharges the battery stack when the judgment result is no, thereby avoiding excessive or insufficient discharge; and determines the discharge current value based on the actual voltage values ​​of each of the single chips, and discharges the battery stack according to the discharge current value through the DCDC conversion module, thereby achieving discharge of the battery stack according to a dynamic current value, further avoiding excessive or insufficient discharge, and improving the performance and life of the battery stack.

[0113] In one embodiment, the step of determining whether to stop discharging based on the actual voltage value of each of the single chips and obtaining the determination result includes:

[0114] Calculating the total voltage of the stack based on the actual voltage values ​​of each of the single chips to obtain the total voltage of the stack;

[0115] If the total voltage of the battery stack is less than a preset first threshold, the judgment result is determined to be yes; otherwise, the judgment result is determined to be no.

[0116] In one embodiment, if the total voltage of the battery stack is lower than a preset first threshold, determining that the judgment result is yes, otherwise, determining that the judgment result is no, includes:

[0117] Find the smallest actual voltage value of the single chip from among the actual voltage values ​​of the single chip, and use it as the lowest voltage value of the single chip;

[0118] If the total voltage of the battery stack is less than the first threshold, or the minimum voltage value of the single chip is less than the preset second threshold, the judgment result is determined to be yes; otherwise, the judgment result is determined to be no.

[0119] In one embodiment, the step of determining the discharge current value based on the actual voltage value of each of the single chips includes:

[0120] Calculating the mean difference based on the actual voltage values ​​of each of the single chips as the voltage mean difference;

[0121] Get the initial maximum discharge current;

[0122] The discharge current value is calculated according to the voltage deviation from the mean and the initial maximum discharge current.

[0123] In one embodiment, the step of controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack in response to the shutdown signal includes:

[0124] In response to the shutdown signal, the reactive gas module is controlled to stop supplying reactive gas to the stack, and the voltage inspection module is controlled to perform voltage detection on each cell in the stack to obtain an initial voltage value of each cell;

[0125] Before the step of obtaining the initial maximum discharge current, the method further includes:

[0126] The initial maximum discharge current is determined according to the initial voltage value of each single chip.

[0127] In one embodiment, the step of calculating the discharge current value based on the voltage deviation from the mean and the initial maximum discharge current includes:

[0128] Calculating a current value according to the voltage deviation from the mean and the initial maximum discharge current as the discharge current value;

[0129] The calculation formula i of the discharge current value is: i=i0-k×Vdep, i0 is the initial maximum discharge current, Vdep is the voltage deviation, and k is the preset discharge current decay rate.

[0130] In one embodiment, the discharge current decay rate is a rate determined according to parameters of the fuel cell stack.

[0131] Figure 3 FIG1 shows an internal structure diagram of a vehicle in an embodiment. The vehicle can be a terminal or a server. Figure 3 As shown, the vehicle includes a processor, a memory, and a network interface connected via a system bus. The memory includes a non-volatile storage medium and an internal memory. The vehicle's non-volatile storage medium stores an operating system and may also store a computer program that, when executed by the processor, enables the processor to implement the shutdown discharge control method. The internal memory may also store a computer program that, when executed by the processor, enables the processor to implement the shutdown discharge control method. Those skilled in the art will understand that Figure 3The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the vehicle to which the solution of the present application is applied. The specific vehicle may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0132] In one embodiment, a computer device is provided, comprising a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor performs the following method. The method is used in a hydrogen fuel cell system, wherein the hydrogen fuel cell system includes: a reactant gas module, a fuel cell stack, a DC-DC conversion module, a voltage patrol module, and a control module. The method includes:

[0133] Get the shutdown signal;

[0134] In response to the shutdown signal, controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack;

[0135] At preset time intervals, control the voltage inspection module to perform voltage detection on each cell in the stack to obtain the actual voltage value of each cell;

[0136] Determine whether to stop discharging according to the actual voltage value of each of the single chips, and obtain a determination result;

[0137] If the judgment result is yes, controlling the DCDC conversion module to stop discharging the battery stack;

[0138] If the judgment result is no, the discharge current value is determined according to the actual voltage value of each of the single chips, and the DCDC conversion module is controlled to discharge the battery stack according to the discharge current value.

[0139] This embodiment first determines whether to stop discharging based on the actual voltage values ​​of each of the single chips determined at preset time intervals, then stops discharging the battery stack when the judgment result is yes, and discharges the battery stack when the judgment result is no, thereby avoiding excessive or insufficient discharge; and determines the discharge current value based on the actual voltage values ​​of each of the single chips, and discharges the battery stack according to the discharge current value through the DCDC conversion module, thereby achieving discharge of the battery stack according to a dynamic current value, further avoiding excessive or insufficient discharge, and improving the performance and life of the battery stack.

[0140] In one embodiment, a vehicle is provided, including a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor performs the following method. The method is used in a hydrogen fuel cell system, wherein the hydrogen fuel cell system includes: a reactant gas module, a fuel cell stack, a DC-DC conversion module, a voltage patrol module, and a control module. The method includes:

[0141] Get the shutdown signal;

[0142] In response to the shutdown signal, controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack;

[0143] At preset time intervals, control the voltage inspection module to perform voltage detection on each cell in the stack to obtain the actual voltage value of each cell;

[0144] Determine whether to stop discharging according to the actual voltage value of each of the single chips, and obtain a determination result;

[0145] If the judgment result is yes, controlling the DCDC conversion module to stop discharging the battery stack;

[0146] If the judgment result is no, the discharge current value is determined according to the actual voltage value of each of the single chips, and the DCDC conversion module is controlled to discharge the battery stack according to the discharge current value.

[0147] This embodiment first determines whether to stop discharging based on the actual voltage values ​​of each of the single chips determined at preset time intervals, then stops discharging the battery stack when the judgment result is yes, and discharges the battery stack when the judgment result is no, thereby avoiding excessive or insufficient discharge; and determines the discharge current value based on the actual voltage values ​​of each of the single chips, and discharges the battery stack according to the discharge current value through the DCDC conversion module, thereby achieving discharge of the battery stack according to a dynamic current value, further avoiding excessive or insufficient discharge, and improving the performance and life of the battery stack.

[0148] In one embodiment, the above-mentioned step of determining whether to stop discharging based on the actual voltage value of each single chip and obtaining the judgment result includes: calculating the total voltage of the battery stack based on the actual voltage value of each single chip to obtain the total voltage of the battery stack; if the total voltage of the battery stack is less than a preset first threshold, determining that the judgment result is yes, otherwise, determining that the judgment result is no.

[0149] In one embodiment, the above-mentioned step of determining that the judgment result is yes if the total voltage of the battery stack is lower than a preset first threshold, and otherwise determining that the judgment result is no, includes: finding the single-chip actual voltage value with the smallest value from each of the single-chip actual voltage values ​​as the single-chip minimum voltage value; if the total voltage of the battery stack is less than the first threshold, or the single-chip minimum voltage value is less than a preset second threshold, determining that the judgment result is yes, otherwise, determining that the judgment result is no.

[0150] In one embodiment, the step of determining the discharge current value based on the actual voltage values ​​of each of the single chips includes: calculating the mean difference based on the actual voltage values ​​of each of the single chips as the voltage mean difference; obtaining the initial maximum discharge current; and calculating the discharge current value based on the voltage mean difference and the initial maximum discharge current.

[0151] In one embodiment, the above-mentioned step of responding to the shutdown signal and controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack includes: responding to the shutdown signal, controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack, and controlling the voltage inspection module to perform voltage detection on each chip in the fuel cell stack to obtain the initial voltage value of each single chip; before the step of obtaining the initial maximum discharge current, it also includes: determining the initial maximum discharge current based on the initial voltage value of each single chip.

[0152] In one embodiment, the step of calculating the discharge current value based on the voltage deviation from the mean and the initial maximum discharge current includes: calculating a current value based on the voltage deviation from the mean and the initial maximum discharge current as the discharge current value; wherein, the calculation formula i of the discharge current value is: i=i0-k×Vdep, i0 is the initial maximum discharge current, Vdep is the voltage deviation from the mean, and k is a preset discharge current decay rate.

[0153] In one embodiment, the discharge current decay rate is a rate determined according to parameters of the fuel cell stack.

[0154] In one embodiment, a computer-readable storage medium is provided, storing a computer program. When the computer program is executed by a processor, the processor is caused to perform the following method. The method is used in a hydrogen fuel cell system, wherein the hydrogen fuel cell system includes: a reactant gas module, a fuel cell stack, a DC-DC conversion module, a voltage patrol module, and a control module. The method includes:

[0155] Get the shutdown signal;

[0156] In response to the shutdown signal, controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack;

[0157] At preset time intervals, control the voltage inspection module to perform voltage detection on each cell in the stack to obtain the actual voltage value of each cell;

[0158] Determine whether to stop discharging according to the actual voltage value of each of the single chips, and obtain a determination result;

[0159] If the judgment result is yes, controlling the DCDC conversion module to stop discharging the battery stack;

[0160] If the judgment result is no, the discharge current value is determined according to the actual voltage value of each of the single chips, and the DCDC conversion module is controlled to discharge the battery stack according to the discharge current value.

[0161] This embodiment first determines whether to stop discharging based on the actual voltage values ​​of each of the single chips determined at preset time intervals, then stops discharging the battery stack when the judgment result is yes, and discharges the battery stack when the judgment result is no, thereby avoiding excessive or insufficient discharge; and determines the discharge current value based on the actual voltage values ​​of each of the single chips, and discharges the battery stack according to the discharge current value through the DCDC conversion module, thereby achieving discharge of the battery stack according to a dynamic current value, further avoiding excessive or insufficient discharge, and improving the performance and life of the battery stack.

[0162] In one embodiment, the above-mentioned step of determining whether to stop discharging based on the actual voltage value of each single chip and obtaining the judgment result includes: calculating the total voltage of the battery stack based on the actual voltage value of each single chip to obtain the total voltage of the battery stack; if the total voltage of the battery stack is less than a preset first threshold, determining that the judgment result is yes, otherwise, determining that the judgment result is no.

[0163] In one embodiment, the above-mentioned step of determining that the judgment result is yes if the total voltage of the battery stack is lower than a preset first threshold, and otherwise determining that the judgment result is no, includes: finding the single-chip actual voltage value with the smallest value from each of the single-chip actual voltage values ​​as the single-chip minimum voltage value; if the total voltage of the battery stack is less than the first threshold, or the single-chip minimum voltage value is less than a preset second threshold, determining that the judgment result is yes, otherwise, determining that the judgment result is no.

[0164] In one embodiment, the step of determining the discharge current value based on the actual voltage values ​​of each of the single chips includes: calculating the mean difference based on the actual voltage values ​​of each of the single chips as the voltage mean difference; obtaining the initial maximum discharge current; and calculating the discharge current value based on the voltage mean difference and the initial maximum discharge current.

[0165] In one embodiment, the above-mentioned step of responding to the shutdown signal and controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack includes: responding to the shutdown signal, controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack, and controlling the voltage inspection module to perform voltage detection on each chip in the fuel cell stack to obtain the initial voltage value of each single chip; before the step of obtaining the initial maximum discharge current, it also includes: determining the initial maximum discharge current based on the initial voltage value of each single chip.

[0166] In one embodiment, the step of calculating the discharge current value based on the voltage deviation from the mean and the initial maximum discharge current includes: calculating a current value based on the voltage deviation from the mean and the initial maximum discharge current as the discharge current value; wherein, the calculation formula i of the discharge current value is: i=i0-k×Vdep, i0 is the initial maximum discharge current, Vdep is the voltage deviation from the mean, and k is a preset discharge current decay rate.

[0167] In one embodiment, the discharge current decay rate is a rate determined according to parameters of the fuel cell stack.

[0168] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate (DDR), and the like.

[0169] SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), Direct RAM Bus Dynamic RAM (DRDRAM), and Rambus Dynamic RAM (RDRAM), etc.

[0170] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0171] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A shutdown discharge control method for a hydrogen fuel cell system, the method being applied to the hydrogen fuel cell system, the hydrogen fuel cell system comprising: Reaction gas module, fuel cell stack, DCDC conversion module, voltage inspection module and control module, the method includes: Get the shutdown signal; In response to the shutdown signal, controlling the reaction gas module to stop supplying reaction gas to the fuel cell stack; At preset time intervals, control the voltage inspection module to perform voltage detection on each cell in the stack to obtain the actual voltage value of each cell; Determine whether to stop discharging according to the actual voltage value of each of the single chips, and obtain a determination result; If the judgment result is yes, controlling the DCDC conversion module to stop discharging the battery stack; If the judgment result is no, determining a discharge current value according to the actual voltage value of each of the single chips, and controlling the DCDC conversion module to discharge the battery stack according to the discharge current value; The step of determining whether to stop discharging based on the actual voltage value of each of the single chips and obtaining a determination result includes: Calculating the total voltage of the stack based on the actual voltage values ​​of each of the single chips to obtain the total voltage of the stack; If the total voltage of the battery stack is less than a preset first threshold, determining that the judgment result is yes; otherwise, determining that the judgment result is no; Wherein, if the total voltage of the battery stack is lower than a preset first threshold, determining that the judgment result is yes, otherwise, determining that the judgment result is no, includes: Find the smallest actual voltage value of the single chip from among the actual voltage values ​​of the single chip, and use it as the lowest voltage value of the single chip; If the total voltage of the battery stack is less than the first threshold, or the minimum voltage value of the single chip is less than the preset second threshold, the judgment result is determined to be yes; otherwise, the judgment result is determined to be no.

2. The shutdown discharge control method according to claim 1, characterized in that: The step of determining the discharge current value according to the actual voltage value of each of the single chips includes: Calculating the mean difference based on the actual voltage values ​​of each of the single chips as the voltage mean difference; Get the initial maximum discharge current; The discharge current value is calculated according to the voltage deviation from the mean and the initial maximum discharge current.

3. The shutdown discharge control method according to claim 2, characterized in that: The step of controlling the reaction gas module to stop supplying the reaction gas to the fuel cell stack in response to the shutdown signal includes: In response to the shutdown signal, the reactive gas module is controlled to stop supplying reactive gas to the stack, and the voltage inspection module is controlled to perform voltage detection on each cell in the stack to obtain an initial voltage value of each cell; Before the step of obtaining the initial maximum discharge current, the method further includes: The initial maximum discharge current is determined according to the initial voltage value of each single chip.

4. The shutdown discharge control method according to claim 2, characterized in that: The step of calculating the discharge current value according to the voltage deviation from the mean and the initial maximum discharge current includes: Calculating a current value according to the voltage deviation from the mean and the initial maximum discharge current as the discharge current value; The calculation formula i of the discharge current value is: i = i0 - k × Vdep, i0 is the initial maximum discharge current, Vdep is the voltage deviation, and k is the preset discharge current decay rate.

5. The shutdown discharge control method according to claim 4, characterized in that: The discharge current decay rate is a rate determined according to parameters of the fuel cell stack.

6. A shutdown discharge control device, characterized in that: The device is used to apply the shutdown discharge control method according to any one of claims 1 to 5, and the device is used in a hydrogen fuel cell system, which includes: a reaction gas module, a fuel cell stack, a DCDC conversion module, a voltage inspection module and a control module, and the shutdown discharge control device is loaded in the control module; The shutdown discharge control device is used to obtain a shutdown signal; in response to the shutdown signal, control the reaction gas module to stop supplying reaction gas to the fuel cell stack; at a preset time interval, control the voltage inspection module to perform voltage detection on each chip in the fuel cell stack to obtain the actual voltage value of each single chip; judge whether to stop discharging based on the actual voltage value of each single chip to obtain a judgment result; if the judgment result is yes, control the DCDC conversion module to stop discharging the fuel cell stack; if the judgment result is no, determine the discharge current value based on the actual voltage value of each single chip, and control the DCDC conversion module to discharge the fuel cell stack based on the discharge current value.

7. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 5.

8. A vehicle comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 5.

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