A control method and a battery system

Abstract

The application provides a control method and a battery system. The control method comprises the following steps: operating the battery system; collecting an operating voltage of the battery system; calculating an average value of the operating voltage as an average voltage; calculating a minimum value of the operating voltage as a minimum voltage; controlling the battery system to discharge internal accumulated water according to the average voltage and the minimum voltage; detecting whether a parameter of the battery system is abnormal; and if the parameter is abnormal, making the battery system enter a protection shutdown state. The control method of the application solves the technical problem that the method for discharging accumulated water of a fuel cell influences the efficiency of the battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel cell technology, in particular to a control method and a cell system. BACKGROUND

[0002] The proton exchange membrane fuel cell is a power generation device for converting chemical energy into electrical energy, which is not limited by the Carnot cycle, has the characteristics of high efficiency, zero emission, fast start-up, etc., and is a clean and efficient hydrogen energy utilization device. Hydrogen is reacted in the fuel cell to generate water, and at the same time, electricity and heat are generated. In order to ensure the continuous and stable output of electrical energy of the fuel cell, the water and heat of the fuel cell must be managed and controlled.

[0003] The goal of thermal management of the fuel cell 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 single cells of the fuel cell is as uniform as possible; the goal of water management of the fuel cell is to timely discharge the water generated by the fuel cell from the stack to avoid water flooding in the stack, causing hydrogen starvation and reverse polarity problems.

[0004] Fuel cells are divided into air-cooled and water-cooled technical solutions according to the amount of heat generated. Air-cooled fuel cells have a simple system structure and lower parasitic power, and are often used in backup power sources, light power systems, etc. In the air-cooled fuel cell system, in order to improve the utilization rate of hydrogen, an anode closed design is usually adopted. When the stack has reacted for a period of time, the performance of the fuel cell will gradually decrease due to the accumulation of water in the anode. At this time, pulse discharge is needed to discharge the internal accumulated water to restore the performance of the fuel cell in time. The control of pulse discharge is particularly important. If the pulse discharge cycle is too frequent, the fuel cell will not be flooded, but the utilization rate of hydrogen will be reduced. If the pulse discharge cycle is too long, the fuel cell will be flooded, which will damage the fuel cell if not protected in time. Therefore, it is necessary to find an optimal discharge frequency point. When the fuel cell is pulse discharged, more heat will be taken away from the stack due to the short-time hydrogen sweeping, so the existing technology has the technical problem that the method for discharging accumulated water of the fuel cell affects the efficiency of the cell. SUMMARY

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

[0006] To achieve the above technical objectives, the present invention adopts the following technical solution: a control method is provided, including operating a battery system; acquiring 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 internal water based on 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 protection shutdown state.

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

[0008] Furthermore, based on the average voltage and minimum voltage, the method for controlling the discharge of internal water from the battery system includes: calculating ΔV = VV min When ΔV is greater than the threshold V P At that time, the battery system is controlled to drain any accumulated water.

[0009] Furthermore, V P The setting methods include: giving V P The initial value is used to record the time interval between two adjacent pulse emissions, and the current pulse emission interval is denoted as T. n The interval between the last pulse emission was T. n-1 The next pulse emission time is T. n+1 Compared to T n -T n-1 and T n+1 -T n The size of T is adjusted automatically as follows: n -T n-1 <T n+1 -T n When, then decrease V P The value of T; when T n -T n-1 >T n+1 -T n When, increase V P The value of .

[0010] Furthermore, methods for controlling the discharge of water from inside the battery system include: opening the solenoid valve of the pipeline that supplies hydrogen to the battery system; opening the solenoid valve of the outlet pipeline that discharges water from the battery system; and continuing this process for a period of time.

[0011] Furthermore, the method for controlling the discharge of water inside the battery system includes pulse discharge of the battery system, and the method for pulse discharge includes recording the average voltage before pulse discharge as V. n The average voltage after pulse emission is recorded as follows: Record the voltage before the next pulse emission. Record the average voltage after the next pulse emission. when At that time, the pulse discharge pressure remains constant at P1. At that time, the pulse discharge pressure increases to P2; when the pressure increases to P2, when Keep P2 and the duration T1 of the pulse emission constant; if If this happens, the pulse emission duration T2 is increased until T2 is adjusted to its maximum value.

[0012] Furthermore, methods for detecting whether battery system parameters are abnormal include: if the battery system fails to recover to its original performance after multiple consecutive pulse discharges over a period of time, the battery system parameters are deemed abnormal; and / or, when the battery system is running, V min Below a certain voltage V low When pressure is applied, the battery system parameters are determined to be abnormal.

[0013] A battery system, applicable to the above-described control method, includes: a battery stack; a hydrogen storage tank connected to the battery stack to supply hydrogen to the battery stack; a voltage detector connected to the battery stack to check the voltage of the battery stack; an outlet solenoid valve connected to the battery stack to drain accumulated water from the battery stack; and a control module connected to the outlet solenoid valve and the voltage detector.

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

[0015] Furthermore, the hydrogen storage tank includes multiple pipelines connected to the battery stack; each pipeline is equipped with an inlet solenoid valve; and / or, the hydrogen storage tank includes multiple pipelines connected to the battery stack; each pipeline is equipped with an inlet pressure reducing valve.

[0016] Furthermore, the battery stack includes multiple battery cells, and the voltage detector is connected to each of the multiple battery cells respectively.

[0017] Beneficial effects:

[0018] 1. The control method of the application comprises: running the battery system; collecting the running voltage of the battery system; calculating the average value of the running voltage as the average voltage; calculating the minimum value of the running voltage as the minimum voltage; controlling the battery system to discharge the internal water according to the average voltage and the minimum voltage; detecting whether the parameter of the battery system is abnormal; and if the parameter is abnormal, making the battery system enter the protection shutdown state. With the above arrangement, the voltage inspector collects the voltage of the fuel cell for analyzing the working state of the fuel cell, and the pulse discharge method adaptive to the variable load working condition of the battery system and the fuel cell system are adopted. With the discharge method, the performance of the fuel cell in the water accumulation state can be restored, the state of the battery system is judged according to the parameter in the restoration process, the fault is eliminated, and the time for discharging the water is controlled according to the running voltage of the battery system, so that the technical problem that the discharge method of the fuel cell affects the battery efficiency is solved.

[0019] 2. The control method of the application can accurately judge that more water is generated in the fuel cell according to the running parameter of the fuel cell, and predict the water flooding state.

[0020] 3. The control method of the application can ensure that the performance of the fuel cell is restored and the waste of hydrogen is reduced as much as possible by controlling the discharge time, interval time, pressure and temperature of the anode when the fuel cell is about to be flooded.

[0021] 4. The control method of the application can ensure the long-term stable output of the fuel cell by managing the water thermal state in the fuel cell under the premise of ensuring the hydrogen utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the battery system adopted by the embodiment of the application;

[0023] Figure 2 is an effect schematic diagram of the control method adopted by the embodiment of the application;

[0024] Figure 3 is a flow schematic diagram of the control method adopted by the embodiment of the application.

[0025] Among them, the above drawings include the following reference signs:

[0026] 1, hydrogen storage tank; 2, voltage inspector; 3, outlet electromagnetic valve; 4, first inlet electromagnetic valve; 5, second inlet electromagnetic 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 make the person skilled in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0028] According to the embodiments of the present application, referring to Figures 1 to 3 , a control method is provided, comprising: running a battery system; collecting a running voltage of the battery system; calculating an average value of the running voltage as an average voltage; calculating a minimum value of the running voltage as a minimum voltage; controlling the battery system to discharge internal water according to the average voltage and the minimum voltage; detecting whether a parameter of the battery system is abnormal; and if the parameter is abnormal, making the battery system enter a protection shutdown state. With the above setting, the voltage inspector collects the voltage of the fuel cell for analyzing the working state of the fuel cell, and can adapt to the pulse discharge method of the variable load working condition of the battery system and the fuel cell system. With the discharge method, the system can restore the performance of the fuel cell in the water accumulation state. According to the parameters in the restoration process, the state of the battery system is judged, and the fault is eliminated. According to the running voltage of the battery system, the time for discharging the water is controlled, and the technical problem that the method for discharging the water of the fuel cell affects the efficiency of the battery is solved.

[0029] In the control method of the present embodiment, referring to Figure 3 , the method for calculating the average value of the running voltage as the average voltage and the minimum voltage comprises: collecting the voltage V1, V2, V3, … Vn of each single cell of the stack when the battery system is running n , and calculating the average voltage of the stack , and screening out the minimum voltage V min from the voltage of the single cell. In this way, the voltage of a time period is compared, and the state of the battery system can be judged in real time.

[0030] Referring to Figure 3 , in the control method of the present embodiment, the method for controlling the battery system to discharge internal water according to the average voltage and the minimum voltage comprises: calculating When ΔV is greater than a threshold value V P , the battery system is controlled to discharge internal water. Specifically, the initial value of Vp is set according to laboratory data, and is not necessarily suitable for all working conditions of the fuel cell. The optimal discharge time of the stack in the actual application is strongly related to the load characteristics and the environmental temperature and humidity. Therefore, adjusting the value of Vp according to the discharge interval time can make the product dynamically adapt to the actual operating conditions.

[0031] In the control method of the present embodiment, in the control method of the present embodiment, VP The setting method comprises: giving an initial value of V P , recording interval time of two adjacent pulse discharges, current pulse discharge interval is recorded as Tn, last pulse discharge interval time is T n-1 , next pulse discharge time is T n+1 , comparing sizes of T n -T n-1 and T n+1 -T n , and automatically adjusting value in the following way: when T n -T n-1 <T n+1 -T n , value of V P is reduced; when T n -T n-1 >T n+1 -T n , value of V P is increased.

[0032] Specifically, when T n -T n-1 <T n+1 -T n , time of two adjacent discharges becomes longer, which is probably due to long-time operation of the battery, leading to overall performance attenuation, which is manifested as that the average voltage and the minimum voltage are both reduced while the voltage difference AV is basically unchanged, at this time, the stack needs to be vented to discharge the waste gas inside the stack to restore the performance of the stack, and the reduction of Vp value is to trigger timely venting, so that the next discharge interval time will be shortened, according to this logic, the original Vp value will be returned.

[0033] When T n -T n-1 >T n+1 -T n , time of two adjacent discharges becomes shorter, which indicates that hydrogen discharge becomes more frequent and hydrogen utilization rate decreases, which indicates that the environmental condition at this time is prone to produce water, under the premise of not affecting the electrode of the stack, appropriately increasing Vp can prolong the discharge time and improve the hydrogen utilization rate, so that the next discharge interval time will be lengthened, according to this logic, the original Vp value set will be returned.

[0034] In the control method of the embodiment, referring to Figure 3 , the method for controlling the battery system to discharge the accumulated water inside the battery system comprises: opening an electromagnetic valve of a pipeline for inputting hydrogen into the battery system; opening an electromagnetic valve of an outlet pipeline for discharging the accumulated water in the battery system; and continuing for a period of time.

[0035] Specifically, the water in the fuel cell is discharged by gravity and pressure difference, and the inlet valve of the battery is opened to enable hydrogen to enter the stack to discharge the internal water.

[0036] Referring to Figure 3 In the control method of the embodiment, the method for controlling the battery system to discharge the accumulated water in the battery system includes pulse discharging the battery system, and the method for pulse discharging includes: recording the average voltage before pulse discharging as V n , recording the average voltage after pulse discharging as recording the voltage before the next pulse discharging as recording the average voltage after the next pulse discharging as When , the pulse discharging pressure remains P1, when , the pulse discharging pressure is increased to P2; when the pressure is increased to P2, when P2 and the duration T1 of pulse discharging remain unchanged; if , the pulse discharging duration T2 is increased until T2 is adjusted to the maximum value.

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

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

[0039] When , the difference between the average voltage before and after the exhaust gas is increased, indicating that the stack is sufficiently discharged, the performance of the stack is recovered well, and it is indicated that the exhaust gas pressure and the exhaust gas time are appropriate.

[0040] When , the difference between the average voltage before and after the exhaust gas is reduced, indicating that the performance recovery of the stack after the exhaust gas is not as good as the previous one, which may be caused by insufficient exhaust gas, and the internal water is not completely discharged, affecting the performance of the stack. At this time, the exhaust gas pressure is increased to P2, which aims to completely discharge the internal water of the stack.

[0041] Similarly, if the water drainage of the stack is still insufficient after P2, the exhaust gas time can be extended to T2 to ensure that the internal water is completely discharged and the performance of the stack is recovered as much as possible.

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

[0043] Specifically, V low It is the minimum single-cell voltage that a fuel cell can operate normally, V. low It is the lowest single-cell voltage among all the individual cells of the fuel cell when it is working. The lowest single-cell voltage may be lower than the minimum allowable voltage, but the normal average voltage will not be lower than the minimum voltage.

[0044] Specifically, higher venting pressure and longer venting time are more beneficial for the recovery of the battery stack performance; however, they also waste hydrogen. Therefore, the purpose of this setting is to minimize hydrogen waste while ensuring the recovery of the battery stack performance. If the above objective cannot be achieved, it indicates a problem with the battery system.

[0045] The battery system of this embodiment is applicable to the control method described above. The battery system includes: a battery stack 9; a hydrogen storage tank 1 connected to the battery stack 9 to provide hydrogen to the battery stack 9; a voltage detector 2 connected to the battery stack 9 to check the voltage of the battery stack 9; an outlet solenoid valve connected to the battery stack 9 to drain water accumulated in the battery stack 9; and a control module connected to the outlet solenoid valve and the voltage detector 2.

[0046] With the above settings, see [link / reference] Figure 1 The voltage monitor collects the voltage of the fuel cell to analyze its operating status. It can adapt to the pulse emission method of the battery system under varying load conditions and the fuel cell system. Using this emission method, the system can restore the performance of the fuel cell in a water-filled state. Based on the parameters during the recovery process, the state of the battery system is judged and the fault is eliminated. The timing of water discharge is controlled according to the operating voltage of the battery system, thus solving the technical problem that the method of water discharge affects the battery efficiency.

[0047] See Figure 1 In this embodiment, the battery system includes: an inlet solenoid valve, signal-connected to the control module, which is installed on the pipeline of the hydrogen storage tank 1 to control the opening and closing of the pipeline; an inlet pressure reducing valve, signal-connected to the control module, which is installed on the pipeline of the hydrogen storage tank 1 to control the pressure of the pipeline; and a heat dissipation structure 8, signal-connected to the control module, used to dissipate heat for the battery stack 9. This structure allows for gas replenishment or drainage of accumulated water, and also dissipates heat from the system, ensuring its normal operation.

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

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

[0050] In the battery system of the embodiment, the battery stack 9 includes a plurality of battery pieces, and the voltage detector 2 is connected with the plurality of battery pieces respectively.

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

[0052] When the fuel cell works, the fluctuation of the rear-end load will cause the synchronous adjustment of the working point of the fuel cell. Generally, in the light load state, the working voltage of the fuel cell is high, and the current is small. The water generated in the fuel cell is directly evaporated in the gas state under the action of convection and heat conduction, and the fuel cell is basically not flooded. In the heavy load state, the working voltage of the fuel cell is reduced, and the working current is large. A large amount of water will be generated in the fuel cell. At this time, the evaporation speed of the water vapor is less than the generation speed of the water, and the fuel cell will gradually produce accumulated water. If the water in the flow channel is not timely removed, it will hinder the speed of hydrogen transmission to the proton exchange membrane. At this time, the hydrogen "starvation" phenomenon will appear in the flooded area. The area appearing "starvation" for a long time will further cause the fuel cell to be reversed. At this time, the fuel cell will appear irreversible damage.

[0053] The control method of the embodiment is described as follows: Figure 1 The heat dissipation fan arranged on the fuel cell will take away the excess heat generated by the battery stack, so as to maintain the constant temperature of the battery stack. The voltage detector 2 collects the voltage of each single battery in the fuel cell, which is used for analyzing the working state of the fuel cell.

[0054] The hydrogen input of the fuel cell is provided with a pipeline composed of the first inlet pressure reducing valve 7 and the first inlet electromagnetic valve 4, which provides the hydrogen with the first working pressure P1 for the working of the battery stack. The pipeline composed of the second inlet pressure reducing valve 6 and the second inlet electromagnetic valve 5 is arranged, which provides the hydrogen with the second working pressure P2 for the battery stack. The first working pressure and the second working pressure are arranged in the pressure range of the battery stack operation, but the inlet pressure values are different, P1 < P2.

[0055] When the fuel cell is operating normally, the first inlet solenoid valve 4 is open, the outlet solenoid valve is closed, the cooling fan operates at an appropriate speed according to the stack temperature, and the voltage V1, V2, V3...V of each individual cell in the stack is collected by the voltage monitor 2. n Calculate the average voltage of the fuel cell stack. Select the minimum voltage V among the single cell voltages min Calculate the judgment voltage When ΔV is greater than a certain value V P Drain the accumulated water. P The optimal value is generally taken as 0.05 to 0.2 V. P The voltage selection is based on calibration using test data from the fuel cell stack, followed by intelligent adjustment within the system. V P Choosing an excessively large value will lead to untimely protection of the fuel cell, V P If the selection is too small, it will lead to frequent pulse emissions, resulting in a waste of hydrogen fuel.

[0056] V P Selection method: V is given in the software. P The initial value is used to record the time interval between two adjacent pulse emissions, and the current pulse emission interval is denoted as T. n The interval between the last pulse emission was T. n-1 The next pulse emission time is T. n+1 Compared to T n -T n-1 and T n+1 -T n The size of T is adjusted automatically as follows: n -T n-1 <T n+1 -T n When, then decrease V P The value of T; when T n -T n-1 >T n+1 -T n When, increase V P The value of .

[0057] When the fuel cell stack is about to enter a water-flooded state, the fuel cell system initiates an anode pulse emission operation. Simultaneously, the second inlet solenoid valve 5 and the outlet solenoid valve are opened, and the cooling fan speed is reduced. The pulse emission state lasts for T1, with T1 typically ranging from 0.2 to 5 seconds. The system continues until performance recovers, at which point the outlet solenoid valve is closed, and the fuel cell re-enters the operating state until the next pulse emission state. The average voltage curve during fuel cell pulse emission is shown in [reference needed]. Figure 2 .

[0058] Specifically, the second inlet is different from the first inlet in hydrogen pressure, and the second inlet electromagnetic valve 5 is used to increase the hydrogen pressure of the inlet.

[0059] The selection method of the pulse discharge pressure P1, P2. The average voltage before the pulse discharge is The average voltage after the pulse discharge 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 , the pulse discharge pressure remains P1, when , the pulse discharge pressure increases to P2; when the pressure increases to P2, when , P2 and T1 time remain unchanged; if , the pulse discharge duration T2 is increased until T2 is adjusted to the maximum value.

[0060] When the fuel cell is continuously pulsed multiple times in a short time, the fuel cell still cannot recover to the original performance, that is, the fuel cell is determined to be flooded, at which time the system will automatically shut down for protection; when the fuel cell is running, V min is lower than a certain voltage V low , it is determined that the fuel cell may have a fault, and the system will also enter a protection state, and the overall control flow chart is shown in Figure 3 .

[0061] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, 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 "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0062] Alternatively, specific examples in the embodiments can refer to the examples described in the above-described embodiments, and the embodiments will not be described here.

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

[0064] In the above-described embodiments of the present application, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0065] The above merely preferred embodiments of the present application, it should be noted that for those of ordinary skill in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements should also be considered as the scope of protection of the present application.

Claims

1. A control method, characterized in that, include: Operating the battery system; Collect the operating voltage of the battery system; Calculate the average value of the operating voltage as the average voltage; The minimum operating voltage is obtained by calculating the minimum value of the operating voltage; The battery system is controlled to discharge internal water based on the average voltage and the minimum voltage. Check whether the parameters of the battery system are abnormal; If the parameters are abnormal, the battery system will enter a protective shutdown state. Methods for calculating the average operating voltage as the average voltage and minimum voltage include: When the battery system is running, the voltage of each individual cell in the battery stack is collected. , , ... Calculate the average voltage of the fuel cell stack. ; Select the minimum voltage among the single cell voltages ; The method for controlling the discharge of internal water from the battery system based on the average voltage and the minimum voltage includes: calculate ,when Greater than the threshold At the same time, the battery system is controlled to discharge internal water. The setup methods include: Give The initial value is used to record the time interval between two adjacent pulse emissions, and the current pulse emission interval is denoted as T. n The interval between the last pulse emission was T. n-1 The next pulse emission time is T. n+1 Compared to T n -T n-1 and T n+1 -T n The size of T is adjusted automatically as follows: n -T n-1 <T n+1 -T n When, then decrease The value of T; when T n -T n-1 >T n+1 -T n When, it increases The value of .

2. The control method according to claim 1, characterized in that, Methods for controlling the discharge of internal water from the battery system include: Open the solenoid valve of the pipeline that supplies hydrogen to the battery system; open the solenoid valve of the outlet pipeline that drains water from the battery system; continue for a period of time.

3. The control method according to claim 1, characterized in that, The method for controlling the discharge of water accumulated inside the battery system includes pulse discharge of the battery system, and the method for pulse discharge includes: The average voltage before pulse emission was recorded as follows: The average voltage after pulse emission is recorded as follows: Record the voltage before the next pulse emission as Record the average voltage after the next pulse emission. ; when - ≤ - At that time, the pulse discharge pressure remains constant at P1. - > - At that time, the pulse discharge pressure increases to P2; when the pressure increases to P2, when - > - Keep P2 and the duration T1 of the pulse emission constant; if - < - If this happens, the pulse emission duration T2 is increased until T2 is adjusted to its maximum value.

4. The control method according to claim 1, characterized in that, Methods for detecting whether the parameters of the battery system are abnormal include: If the battery system fails to recover its original performance after multiple consecutive pulse discharges over a period of time, the battery system parameters are deemed abnormal; and / or, When the battery system is running Below a certain voltage When this occurs, the battery system parameters are determined to be abnormal.

5. A battery system, applicable to the control method according to any one of claims 1 to 4, characterized in that, The battery system includes: Battery stack (9); Hydrogen storage tank (1), which is connected to the battery stack (9) to provide hydrogen to the battery stack (9); A voltage detector (2) is connected to the battery stack (9) to check the voltage of the battery stack (9); An outlet solenoid valve is connected to the battery stack (9) to drain the water accumulated in the battery stack (9); The control module is connected to the outlet solenoid valve via signal connection; the control module is also connected to the voltage detector (2) via signal connection.

6. The battery system according to claim 5, characterized in that, The battery system includes: An inlet solenoid valve is connected to the control module via a signal. The inlet solenoid valve is installed on the pipeline of the hydrogen storage tank (1) to control the opening and closing of the pipeline of the hydrogen storage tank (1). An inlet pressure reducing valve is connected to the control module via a signal. The inlet pressure reducing valve is installed on the pipeline of the hydrogen storage tank (1) to control the pressure of the pipeline of the hydrogen storage tank (1). The heat dissipation structure (8) is connected to the control module signal and is used to dissipate heat for the battery stack (9).

7. The battery system according to claim 6, characterized in that, The hydrogen storage tank (1) includes multiple pipelines connected to the battery stack (9); each pipeline is equipped with the inlet solenoid valve; and / or, The hydrogen storage tank (1) includes multiple pipelines connected to the battery stack (9); each pipeline is equipped with an inlet pressure reducing valve.

8. The battery system according to claim 6, characterized in that, The battery stack (9) includes multiple battery cells, and the voltage detector (2) is connected to each of the multiple battery cells respectively.

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