Control method and battery system

Abstract

The invention provides a control method and a battery system. The control method comprises the following steps: running the battery system; acquiring the operating voltage of the battery system; calculating an average value of the operation voltage as an average voltage; calculating the minimum value of the operation voltage to obtain the minimum voltage; controlling the battery system to discharge internal accumulated water according to the average voltage and the minimum voltage; detecting whether the parameters of the battery system are abnormal; if the parameters are abnormal, the battery system enters a protection shutdown state, and the control method solves the technical problem that the accumulated water discharging method of the fuel battery affects the battery efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a control method and a battery system. Background Art

[0002] Proton exchange membrane fuel cell is a power generation device that converts chemical energy into electrical energy. It is not limited by the caloric cycle and has the characteristics of high efficiency, zero emission, fast start-up, etc. It is a clean and efficient hydrogen energy utilization device. Hydrogen reacts in the fuel cell to generate water, and at the same time generates electricity and heat. In order to ensure the continuous and stable output of electricity by the fuel cell, the water and heat of the fuel cell must be managed and controlled.

[0003] The goal of thermal management of fuel cells is to ensure that the temperature of the fuel cell stack is stable within a certain range, and to ensure that the temperature between the fuel cell cells is kept as uniform as possible; the goal of water management of fuel cells is to discharge the water generated by the fuel cell out of the stack in a timely manner to avoid flooding inside the stack, causing problems such as hydrogen starvation and reverse polarity.

[0004] Fuel cells are divided into two technical solutions: air cooling and water cooling according to the amount of heat generated. Air-cooled fuel cells are often used in backup power supplies, light power systems and other scenarios due to their simple system structure and lower parasitic power. In air-cooled fuel cell systems, in order to improve the utilization rate of hydrogen, a closed anode design is usually adopted. After a period of reaction in the stack, the performance of the fuel cell will gradually decline due to the accumulation of anode water. At this time, it is necessary to use pulse discharge to discharge the accumulated water inside to restore the performance of the fuel cell in time. The rhythm control of pulse discharge is particularly important. If the cycle of pulse discharge is too frequent, the advantage is that the fuel cell will basically not be flooded, but the disadvantage is that the utilization rate of hydrogen will be reduced; if the cycle of pulse discharge is too long, it will cause flooding in the fuel cell. If it is not protected in time, it will damage the fuel cell, so it is necessary to find an optimal discharge frequency point. When the fuel cell is pulsed, due to the short-term hydrogen purge, more heat will be taken away from the stack. Therefore, there is a technical problem in the prior art that the method of discharging accumulated water from the fuel cell affects the efficiency of the battery. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and provide a control method and a control system to solve the technical problem in the related art that the method for discharging accumulated water from a fuel cell affects the efficiency of the cell.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: a control method is provided, including operating a battery system; collecting the operating voltage of the battery system; calculating the average value of the operating voltage as the average voltage; calculating the minimum value of the operating voltage to obtain the minimum voltage; according to the average voltage and the minimum voltage, controlling the battery system to discharge the accumulated water inside; detecting whether the parameters of the battery system are abnormal; if the parameters are abnormal, causing the battery system to enter a protective shutdown state.

[0007] Furthermore, the method for calculating the average value of the operating voltage as the average voltage and the minimum voltage includes: when the battery system is running, collecting the voltage V1, V2, V3, ..., V of each single cell in the battery stack n , calculate the average voltage of the battery stack Filter out the minimum voltage V among the single battery voltages min .

[0008] Further, according to the average voltage and the minimum voltage, the method for controlling the battery system to discharge the accumulated water inside includes: calculating ΔV=VV min , when ΔV is greater than the threshold V P When the battery system is powered on, it controls the battery system to discharge the accumulated water inside.

[0009] Furthermore, V P The setting method includes: given V P The initial value of the pulse emission is recorded, and the interval between two adjacent pulse emissions is recorded. The current pulse emission interval is recorded as T n , the last pulse emission interval is T n-1 , the next pulse emission time is T n+1 , compared with T n -T n-1 and T n+1 -T n The size of the T n -T n-1 <T n+1 -T n When V P The value of T n -T n-1 >T n+1 -T n When V P The value of .

[0010] Furthermore, the method for controlling the battery system to discharge the accumulated water inside includes: opening the solenoid valve of the pipeline for introducing hydrogen into the battery system; opening the solenoid valve of the outlet pipeline for discharging the accumulated water in the battery system; and continuing for a period of time.

[0011] Furthermore, the method for controlling the battery system to discharge the accumulated water inside includes pulse discharging the battery system, and the method for pulse discharging includes: recording the average voltage before the pulse discharge as V n , the average voltage after recording the pulse discharge is The voltage before the next pulse discharge is recorded as The average voltage after a pulse discharge is recorded as when When the pulse discharge pressure remains unchanged at P1, When the pulse discharge pressure increases to P2, when the pressure increases to P2, Keep P2 and the duration of pulse emission T1 unchanged; if When the pulse emission duration T2 is increased, it is adjusted to the maximum value.

[0012] Further, the method for detecting whether the parameters of the battery system are abnormal includes: when the battery system still cannot recover to its original performance after continuous pulse discharge for multiple times within a period of time, it is determined that the battery system parameters are abnormal; and / or when the battery system is running, V min Below a certain voltage low When the voltage is exceeded, it is determined that the battery system parameters are abnormal.

[0013] A battery system is suitable for the above-mentioned control method, and the battery system includes: a battery stack; a hydrogen storage tank, which is connected to the battery stack to provide hydrogen for the battery stack; a voltage patroller, which is connected to the battery stack to check the voltage of the battery stack; an outlet solenoid valve, which is connected to the battery stack to discharge the accumulated water in the battery stack; a control module, which is connected to the outlet solenoid valve signal; and the control module is connected to the voltage patroller signal.

[0014] Furthermore, the battery system includes: an inlet solenoid valve, which is connected to the control module signal and is arranged on the pipeline of the hydrogen storage tank to control the on-off of the pipeline of the hydrogen storage tank; an inlet pressure reducing valve, which is connected to the control module signal and is arranged on the pipeline of the hydrogen storage tank to control the pressure of the pipeline of the hydrogen storage tank; a heat dissipation structure, which is connected to the control module signal and is used to dissipate heat for the battery stack.

[0015] Further, the hydrogen storage tank includes a plurality of pipelines connected to the battery stack; each pipeline is provided with an inlet solenoid valve; and / or, the hydrogen storage tank includes a plurality of pipelines connected to the battery stack; each pipeline is provided with an inlet pressure reducing valve.

[0016] Furthermore, the battery stack includes a plurality of battery cells, and the voltage patroller is connected to the plurality of battery cells respectively.

[0017] Beneficial effects:

[0018] 1. The control method of the present invention includes operating the battery system; collecting the operating voltage of the battery system; calculating the average value of the operating voltage as the average voltage; calculating the minimum value of the operating voltage to obtain the minimum voltage; controlling the battery system to discharge the accumulated water inside according to the average voltage and the minimum voltage; detecting whether the parameters of the battery system are abnormal; if the parameters are abnormal, the battery system enters a protective shutdown state. With the above-mentioned setting, the voltage patroller collects the voltage of the fuel cell for analyzing the working state of the fuel cell, and the pulse discharge method and fuel cell system that can adapt to the variable load conditions of the battery system. With this discharge method, the system can restore the performance of the fuel cell in the water accumulation state, judge the state of the battery system according to the parameters in the recovery process, eliminate the fault, and control the timing of discharging the accumulated water according to the operating voltage of the battery system, solving the technical problem that the method of discharging the accumulated water from the fuel cell affects the battery efficiency.

[0019] 2. The control method of the present invention can determine how to accurately determine that a large amount of water is generated inside the fuel cell based on the operating parameters of the fuel cell, and predict the water flooding state that will occur.

[0020] 3. When the fuel cell is about to be flooded, the control method of the present invention ensures that the fuel cell performance is restored and minimizes the waste of hydrogen by controlling the discharge time, interval time, pressure and temperature of the anode.

[0021] 4. The control method of the present invention ensures the long-term stable output of the fuel cell by managing the hydrothermal state in the fuel cell while ensuring the utilization rate of hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the structure of a battery system used in an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the effect of the control method adopted in the embodiment of the present invention;

[0024] Figure 3 It is a flow chart of the control method adopted in the embodiment of the present invention.

[0025] The above drawings include the following reference numerals:

[0026] 1. Hydrogen storage tank; 2. Voltage patroller; 3. Outlet solenoid valve; 4. First inlet solenoid valve; 5. Second inlet solenoid valve; 6. Second inlet pressure reducing valve; 7. First inlet pressure reducing valve; 8. Heat dissipation structure; 9. Battery stack. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0028] According to an embodiment of the present invention, see Figures 1 to 3 , provides a control method, including operating a battery system; collecting the operating voltage of the battery system; calculating the average value of the operating voltage as the average voltage; calculating the minimum value of the operating voltage to obtain the minimum voltage; controlling the battery system to discharge the accumulated water inside according to the average voltage and the minimum voltage; detecting whether the parameters of the battery system are abnormal; if the parameters are abnormal, causing the battery system to enter a protective shutdown state. With the above settings, the voltage patroller collects the voltage of the fuel cell, which is used to analyze the working state of the fuel cell. The pulse discharge method and fuel cell system that can adapt to the variable load conditions of the battery system. With this discharge method, the system can restore the performance of the fuel cell in the water accumulation state, judge the state of the battery system according to the parameters in the recovery process, eliminate the fault, and control the timing of discharging the accumulated water according to the operating voltage of the battery system, solving the technical problem that the method of discharging the accumulated water from the fuel cell affects the battery efficiency.

[0029] In the control method of this embodiment, see Figure 3 , the method for calculating the average value of the operating voltage as the average voltage and the minimum voltage includes: when the battery system is running, collecting the voltage V1, V2, V3...V of each single cell in the battery stack n , calculate the average voltage of the battery stack Filter out the minimum voltage V among the single battery voltages min In this way, by comparing the voltage over a period of time, the status of the battery system can be determined in real time.

[0030] See also Figure 3 In the control method of this embodiment, the method for controlling the battery system to discharge the internal water accumulation according to the average voltage and the minimum voltage includes: calculating When ΔV is greater than the threshold V P When the battery system is controlled to discharge the accumulated water inside. Specifically, the initial value of Vp is set according to laboratory data and is not necessarily applicable to all operating conditions of fuel cells. The optimal discharge time of the stack in actual application is strongly related to the load characteristics and ambient temperature and humidity. Therefore, adjusting the Vp value according to the discharge interval time can allow the product to dynamically adapt to actual operating conditions.

[0031] In the control method of this embodiment, VP The setting method includes: given V P The initial value of the pulse emission is recorded, and the interval between two adjacent pulse emissions is recorded. The current pulse emission interval is recorded as Tn, and the previous pulse emission interval is recorded as T n-1 , the next pulse emission time is T n+1 , compared with T n -T n-1 and T n+1 -T n The size of the T n -T n-1 <T n+1 -T n When V P The value of T n -T n-1 >T n+1 -T n When V P The value of .

[0032] Specifically, when T n -T n-1 <T n+1 -T n That is, the time between the two emissions becomes longer. This may be due to the long-term operation of the battery, which leads to overall performance degradation, which is manifested as the voltage difference ΔV basically unchanged, but the average voltage and the minimum voltage are decreasing. At this time, the battery stack needs to be vented to discharge the exhaust gas inside the battery stack to restore the performance of the battery stack. Reducing the Vp value is to trigger timely exhaust, so that the next emission interval will be shorter. According to this logic, it will return to the original Vp value.

[0033] When T n -T n-1 >T n+1 -T n When the Vp value is increased appropriately without affecting the stack electrode, the emission time can be extended, the hydrogen utilization rate can be increased, and the next emission interval time will be longer. According to this logic, the Vp value will return to the original setting.

[0034] In the control method of this embodiment, see Figure 3 The method of controlling the discharge of the accumulated water in the battery system includes: opening the solenoid valve of the pipeline for introducing hydrogen into the battery system; opening the solenoid valve of the outlet pipeline for discharging the accumulated water in the battery system; and continuing for a period of time.

[0035] Specifically, drainage is the process of draining the water inside the fuel cell by gravity and pressure difference. Only by opening the inlet cell valve can hydrogen enter the stack and drain the internal water.

[0036] See also Figure 3 In the control method of this embodiment, the method for controlling the battery system to discharge the accumulated water inside includes pulse discharge of the battery system. The pulse discharge method includes: recording the average voltage before the pulse discharge as V n , the average voltage after recording the pulse discharge is The voltage before the next pulse discharge is recorded as The average voltage after a pulse discharge is recorded as when When the pulse discharge pressure remains unchanged at P1, When the pulse discharge pressure increases to P2, when the pressure increases to P2, Keep P2 and the duration of pulse emission T1 unchanged; if Then increase the pulse emission duration T2 until T2 is adjusted to the maximum value.

[0037] Specifically, the pulse discharge of this embodiment refers to the system discharging tail gas and water according to a certain time period. The pulse discharge pressure refers to the hydrogen pressure (gauge pressure) at the inlet of the fuel cell, and different inlet pressures are set according to different flooding conditions.

[0038] Specifically, It is the average voltage difference of the battery stack before and after exhaust. The larger the difference is, the better the exhaust effect is and the better the battery stack performance recovery is.

[0039] when When the exhaust pressure is too low, the average voltage difference before and after exhaust increases, indicating that the stack is fully exhausted and the performance of the stack has recovered better, indicating that the exhaust pressure and exhaust time are appropriate at this time.

[0040] when The average voltage difference before and after exhaust becomes smaller, indicating that the performance recovery of the fuel cell stack after exhaust is not as good as the previous time. This may be caused by insufficient exhaust, and the internal water is not completely discharged, affecting the performance of the fuel cell stack. At this time, the exhaust pressure will be increased to P2, with the aim of completely draining the water inside the fuel cell stack.

[0041] Similarly, if the stack is still not fully drained after P2, the exhaust time can be extended to T2 to ensure that all the internal water is discharged and the stack performance is restored as much as possible.

[0042] In the control method of this embodiment, see Figure 3 The method for detecting whether the parameters of the battery system are abnormal includes: when the battery system still cannot recover to its original performance after multiple pulse discharges within a period of time, it is determined that the battery system parameters are abnormal; and / or when the battery system is running, V minBelow a certain voltage V low When the battery system parameters are abnormal.

[0043] Specifically, V low is the minimum single cell voltage allowed for the fuel cell to work properly, V low It is the lowest cell voltage among all cells when the fuel cell is working. The lowest cell voltage may be lower than the minimum voltage allowed, but the normal average voltage will not be lower than the minimum voltage.

[0044] Specifically, the greater the exhaust pressure and the longer the exhaust time, the better it is for the battery stack performance recovery; but it will also cause hydrogen waste, so the purpose of this setting is to minimize hydrogen waste while ensuring the recovery of battery stack performance. If the above purpose cannot be achieved, it means that there is a problem with the battery system.

[0045] The battery system of this embodiment is suitable for the above-mentioned control method, and the battery system includes: a battery stack 9; a hydrogen storage tank 1, which is connected to the battery stack 9 to provide hydrogen to the battery stack 9; a voltage patroller 2, which is connected to the battery stack 9 to check the voltage of the battery stack 9; an outlet solenoid valve, which is connected to the battery stack 9 to discharge the accumulated water in the battery stack 9; a control module, which is connected to the outlet solenoid valve signal; and the control module is connected to the voltage patroller 2 signal.

[0046] Using the above settings, see Figure 1 The voltage patroller collects the voltage of the fuel cell and is used to analyze the working status of the fuel cell. It is capable of adapting to the pulse emission method and fuel cell system of the variable load condition of the battery system. By adopting this emission method, the system can restore the performance of the fuel cell in the state of water accumulation. According to the parameters in the recovery process, the state of the battery system can be judged and the fault can be eliminated. The timing of discharging the accumulated water can be controlled according to the operating voltage of the battery system, which solves the technical problem that the method of discharging the accumulated water in the fuel cell affects the battery efficiency.

[0047] See also Figure 1 In the battery system of this embodiment, the battery system includes: an inlet solenoid valve, which is connected to the control module signal, and is arranged on the pipeline of the hydrogen storage tank 1 to control the on-off of the pipeline of the hydrogen storage tank 1; an inlet pressure reducing valve, which is connected to the control module signal, and is arranged on the pipeline of the hydrogen storage tank 1 to control the pressure of the pipeline of the hydrogen storage tank 1; a heat dissipation structure 8, which is connected to the control module signal, and the heat dissipation structure 8 is used to dissipate heat for the battery stack 9. The above structure is used to replenish air or drain accumulated water, and dissipate heat for the system to ensure normal operation of the system.

[0048] See also Figure 1In the battery system of this embodiment, the hydrogen storage tank 1 includes a plurality of pipelines connected to the battery stack 9; each pipeline is provided with an inlet solenoid valve; and / or, the hydrogen storage tank 1 includes a plurality of pipelines connected to the battery stack 9; each pipeline is provided with an inlet pressure reducing valve. In this way, the control efficiency of the battery system can be improved, making it have higher performance.

[0049] Specifically, in order to control costs, the hydrogen inlet may only retain one battery valve and a pressure reducing valve. The hydrogen storage tank 1 may be provided with multiple pressure inputs for one bottle, or multiple bottles may be provided with multiple pressure inputs, at least two.

[0050] In the battery system of this embodiment, the battery stack 9 includes a plurality of battery cells, and the voltage patroller 2 is connected to the plurality of battery cells respectively.

[0051] The control method of this embodiment is described as follows:

[0052] When the fuel cell is working, the fluctuation of the back-end load will cause the working point of the fuel cell to be adjusted synchronously. Generally, under light load conditions, the working voltage of the fuel cell is high and the current is low. The water generated inside the fuel cell is directly evaporated and discharged in gaseous form under the action of convection and heat conduction. At this time, the fuel cell will basically not be flooded; second, under heavy load conditions, the working voltage of the fuel cell is reduced and the working current is large. A large amount of water will be generated inside the fuel cell. At this time, the evaporation rate of water vapor is lower than the rate of water generation. Water will gradually accumulate inside the fuel cell. If the water in the flow channel is not removed in time, it will hinder the speed of hydrogen transmission to the proton exchange membrane. At this time, hydrogen "starvation" will occur in the flooded area. The "starvation" area for a long time will further cause the fuel cell to reverse polarity, and the fuel cell will be irreversibly damaged.

[0053] The control method of this embodiment is to achieve the water heat management of the fuel cell. The necessary configuration of the system includes a voltage patroller 2, an inlet solenoid valve, an outlet solenoid valve, a cooling fan (i.e., the cooling structure 8 of this embodiment), a hydrogen storage tank 1, a battery stack 9, etc. Figure 1 The cooling fan of the fuel cell will take away the waste heat generated by the stack and maintain the temperature of the stack constant. The voltage inspector 2 collects the voltage of each single cell in the fuel cell to analyze the working status of the fuel cell.

[0054] The hydrogen input of the fuel cell is provided with a pipeline consisting of a first inlet pressure reducing valve 7 and a first inlet solenoid valve 4, which provides hydrogen with a first working pressure P1 for the operation of the fuel cell stack; the pipeline consisting of a second inlet pressure reducing valve 6 and a second inlet solenoid valve 5 is provided to provide hydrogen with a second working pressure P2 for the fuel cell stack. The first working pressure and the second working pressure are both set within the pressure range of the fuel cell stack operation, but the inlet pressure values ​​are different, P1<P2.

[0055] When the fuel cell is working normally, the first inlet solenoid valve 4 is in an open state, the outlet solenoid valve is in a closed state, the cooling fan runs at a suitable speed according to the temperature of the fuel cell stack, and the voltage V1, V2, V3, ... V of each single cell in the fuel cell stack is collected through the voltage patroller 2. n , calculate the average voltage of the battery stack Filter out the minimum voltage V among the single battery voltages min , calculate the judgment voltage When ΔV is greater than a certain value V P When the water is discharged. P The best value is generally 0.05~0.2V, V P The voltage selection is based on the test data of the battery stack and is intelligently adjusted in the system. P If the value is too large, the fuel cell protection will not be timely. P If the value is too small, it will lead to frequent pulse emissions and waste of hydrogen fuel.

[0056] V P Selection method: Give V in the software P The initial value of the pulse emission is recorded, and the interval between two adjacent pulse emissions is recorded. The current pulse emission interval is recorded as T n , the last pulse emission interval is T n-1 , the next pulse emission time is T n+1 , compared with T n -T n-1 and T n+1 -T n The size of the T n -T n-1 <T n+1 -T n When V P The value of T n -T n-1 >T n+1 -T n When V P The value of .

[0057] When the stack is about to enter the flooding state, the fuel cell system enters the anode pulse discharge action, opens the second inlet solenoid valve 5 and the outlet solenoid valve at the same time, reduces the speed of the cooling fan, and the pulse discharge state lasts for T1. The best time of T1 is generally 0.2 to 5s. The fuel cell returns to the working state until the next pulse discharge state is entered. The average voltage curve of the fuel cell pulse discharge is shown in Figure 1. Figure 2 .

[0058] Specifically, the hydrogen pressure at the second inlet is different from that at the first inlet, and the function of the second inlet solenoid valve 5 is to increase the inlet hydrogen pressure.

[0059] The selection method of pulse discharge pressure P1 and P2. The average voltage before pulse discharge is The average voltage after pulse emission is recorded as The voltage before the next pulse discharge is recorded as The average voltage after the next pulse discharge is recorded as when When the pulse discharge pressure remains unchanged at P1, When the pulse discharge pressure increases to P2, when the pressure increases to P2, Keep P2 and T1 time unchanged; if When the pulse emission duration T2 is increased, it is adjusted to the maximum value.

[0060] When the fuel cell cannot recover to its original performance after continuous pulse discharge for many times in a short period of time, it is judged that the fuel cell is flooded. At this time, the system will automatically shut down for protection. When the fuel cell is running, V min Below a certain voltage V low When the fuel cell is judged to be faulty, the system will enter the protection state. The overall control flow chart is shown in Figure 3 .

[0061] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0062] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0063] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0064] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0065] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A control method, characterized in that: include: Operation of battery systems; Collect the operating voltage of the battery system; Calculate the average value of the operating voltage as the average voltage; Calculate the minimum value of the operating voltage to obtain the minimum voltage; Controlling the battery system to discharge accumulated water therein according to the average voltage and the minimum voltage; Detecting whether parameters of the battery system are abnormal; If the parameters are abnormal, the battery system enters a protection shutdown state.

2. The control method according to claim 1, characterized in that: Methods for calculating the average value of the operating voltage as the average voltage and the minimum voltage include: When the battery system is running, the voltage V1, V2, V3, ... V of each single cell in the battery stack is collected. n , calculate the average voltage of the battery stack Filter out the minimum voltage V among the single battery voltages min .

3. The control method according to claim 2, characterized in that: The method of controlling the battery system to discharge accumulated water therein according to the average voltage and the minimum voltage includes: calculate When ΔV is greater than the threshold V P When the battery system is in operation, the battery system is controlled to discharge the accumulated water inside.

4. The control method according to claim 3, characterized in that: V P The setting methods include: Given V P The initial value of the pulse emission is recorded, and the interval between two adjacent pulse emissions is recorded. The current pulse emission interval is recorded as T n , the last pulse emission interval is T n-1 , the next pulse emission time is T n+1 , compared with T n -T n-1 and T n+1 -T n The size of the T n -T n-1 <T n+1 -T n When V P The value of T n -T n-1 >T n+1 -T n When V P The value of .

5. The control method according to claim 1, characterized in that: The method for controlling the battery system to discharge the accumulated water inside includes: Open the solenoid valve of the pipeline that introduces hydrogen into the battery system; open the solenoid valve of the outlet pipeline that discharges the accumulated water in the battery system; and continue for a period of time.

6. The control method according to claim 1, characterized in that: The method for controlling the battery system to discharge the accumulated water inside includes pulse discharging the battery system. The pulse discharging method includes: The average voltage before recording the pulse discharge is The average voltage after recording the pulse discharge is The voltage before the next pulse discharge is recorded as The average voltage after a pulse discharge is recorded as when When the pulse discharge pressure remains unchanged at P1, When the pulse discharge pressure increases to P2, when the pressure increases to P2, Keep P2 and the duration of pulse emission T1 unchanged; if When the pulse emission duration T2 is increased, it is adjusted to the maximum value.

7. The control method according to claim 1, characterized in that: The method for detecting whether the parameters of the battery system are abnormal includes: When the battery system still cannot recover to its original performance after multiple pulse discharges within a period of time, it is determined that the battery system parameters are abnormal; and / or, When the battery system is running, V min Below a certain voltage low When the pressure is low, it is determined that the battery system parameters are abnormal.

8. A battery system, applicable to the control method according to any one of claims 1 to 7, characterized in that: The battery system comprises: Battery stack (9); A hydrogen storage tank (1), the hydrogen storage tank (1) being connected to the battery stack (9) to provide hydrogen to the battery stack (9); A voltage inspector (2) connected to the battery stack (9) to inspect the voltage of the battery stack (9); an outlet solenoid valve, the outlet solenoid valve being connected to the battery stack (9) to discharge accumulated water in the battery stack (9); A control module, the control module is connected to the outlet solenoid valve signal; the control module is connected to the voltage patroller (2) signal.

9. The battery system according to claim 8, characterized in that: The battery system comprises: An inlet solenoid valve is connected to the control module signal, and the inlet solenoid valve is arranged on the pipeline of the hydrogen storage tank (1) to control the on-off of the pipeline of the hydrogen storage tank (1); An inlet pressure reducing valve is connected to the control module signal, and the inlet pressure reducing valve is arranged on the pipeline of the hydrogen storage tank (1) to control the pressure of the pipeline of the hydrogen storage tank (1); A heat dissipation structure (8) is connected to the control module signal, and the heat dissipation structure (8) is used to dissipate heat for the battery stack (9).

10. The battery system according to claim 9, characterized in that: The hydrogen storage tank (1) comprises a plurality of pipelines connected to the battery stack (9); each pipeline is provided with the inlet solenoid valve; and / or, The hydrogen storage tank (1) comprises a plurality of pipelines connected to the battery stack (9); each pipeline is provided with the inlet pressure reducing valve.

11. The battery system according to claim 8, characterized in that: The battery stack (9) comprises a plurality of battery cells, and the voltage patroller (2) is respectively connected to the plurality of battery cells.

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