Storage battery management system and fuel cell vehicle

Abstract

The embodiment of the invention provides a battery management system and a fuel cell vehicle, and relates to the technical field of monitoring and management of automobile storage batteries. The battery management system comprises a control module, a DCDC module, a fuel battery system and a storage battery. The control module is used for monitoring the voltage of the storage battery, determining the electric quantity of the storage battery according to the voltage, and remotely sending over-low electric quantity information to the user terminal when the electric quantity is over-low; and when a remote charging instruction from the user terminal is received, the fuel cell system charges the storage battery through the DCDC module. And the user terminal is used for providing an option of sending a remote charging instruction for a user when the information that the electric quantity is too low is received. According to the scheme, through remote monitoring and control technology fusion, the maintenance cost is reduced, and the economic benefit is improved.

Description

Technical Field

[0001] This application relates to the technical field of monitoring and management of automotive batteries, and particularly to a battery management system for fuel cell vehicles and fuel cell vehicles. Background Art

[0002] With the rapid development of the new energy vehicle industry, hydrogen fuel cell vehicles have gradually become an important development direction for future automotive energy due to their advantages such as zero emissions and high energy density.

[0003] However, as a key component of a vehicle, the battery system of a hydrogen fuel cell vehicle has its performance stability and safety directly related to the operating efficiency and safety of the entire vehicle. In practical applications, the battery system may face various complex working conditions, such as low-temperature environments and power decline caused by long-term parking. These problems may affect the charge and discharge efficiency and service life of the battery.

[0004] In addition, traditional battery management systems often rely on local control modules for monitoring and are difficult to achieve remote monitoring and intelligent regulation. In cases where the vehicle is far from the maintenance site or the user cannot charge the battery in time, too low battery power may cause the vehicle to fail to start, affecting the user experience.

[0005] Therefore, it is of great significance to study a battery control strategy and device for hydrogen fuel cell vehicles that can achieve remote monitoring and intelligent regulation. Summary of the Invention

[0006] The purpose of this application is to provide a battery management system for fuel cell vehicles and a fuel cell vehicle to enable the fuel cell vehicle to remotely monitor and intelligently regulate the battery.

[0007] To achieve the above purpose, one or more embodiments of this application have adopted the following technical solutions.

[0008] In the first aspect, an embodiment of this application provides a battery management system applied to a fuel cell vehicle. The battery management system includes a control module, a DCDC module, a fuel cell system, and a battery;

[0009] The control module is used for:

[0010] monitoring the voltage of the battery, determining the power of the battery according to the voltage, and when the power is too low, remotely sending the information of too low power to the user terminal;

[0011] when receiving a remote charging instruction from the user terminal, enabling the fuel cell system to charge the battery through the DCDC module;

[0012] The user terminal is used for:

[0013] When the low battery information is received, the user is provided with an option to send the remote charging instruction.

[0014] Optionally, the storage battery includes a power battery;

[0015] The control module stores charging power data corresponding to a pre-calibrated specific power battery temperature and a specific power level;

[0016] The control module is used to obtain the temperature and power of the power battery, obtain the charging power according to the temperature and power of the power battery, and enable the fuel cell system to charge the power battery with the charging power through the DCDC module.

[0017] Optionally, the control module and the user terminal are used for wireless communication with a remote platform;

[0018] The control module is used to send the low power information to the remote platform, and the remote platform sends the low power information to the user terminal;

[0019] The user terminal is used to send the remote charging instruction to the remote platform when receiving the remote charging instruction input by the user, and the remote platform sends the remote charging instruction to the control module.

[0020] Optionally, the control module is used to obtain status information of the battery and send the status information to the remote platform; the status information includes the voltage of each single battery;

[0021] The remote platform monitors according to the status information, processes the status information into status summary information, and sends the status summary information to the user terminal;

[0022] When the remote platform receives a fast charging instruction from the user terminal, the remote platform sends a control signal to the control module;

[0023] The control module is used for:

[0024] When receiving a remote charging instruction from a user terminal, causing the fuel cell system to charge the storage battery at a first power through the DCDC module;

[0025] When the control signal is received, the fuel cell system is enabled to charge the battery with a second power through the DCDC module according to the control signal; the second power is greater than the first power.

[0026] Optionally, the battery includes a power battery and a low-voltage battery;

[0027] The low-voltage battery is used to supply power to the low-voltage load of the fuel cell vehicle;

[0028] The power battery is used to supplement the power output of the fuel cell vehicle when the power demand of the fuel cell vehicle exceeds the power that can be provided by the fuel cell system.

[0029] Optionally, the control module is used to:

[0030] Acquiring an actual state and a target state of the battery, and calculating a deviation between the actual state and the target state of the battery;

[0031] Based on the deviation, a PID control algorithm is used to calculate and obtain a control amount;

[0032] A control instruction is generated according to the calculated control amount, and the control instruction is a charging current.

[0033] Optionally, the storage battery includes a power battery;

[0034] The battery management system further includes a power battery temperature probe, a cooling circulation system, a water inlet temperature probe and a water outlet temperature probe; the number of the power battery temperature probes is greater than 1;

[0035] The control module is also used to detect the temperatures of corresponding positions according to the power battery temperature probe, the water inlet temperature probe and the water outlet temperature probe, and control the operation of the cooling circulation system.

[0036] Optionally, the cooling circulation system includes a condensing circuit, a heat exchanger and a battery cooling water circuit; the condensing circuit and the battery cooling water circuit exchange heat in the heat exchanger;

[0037] The condensing circuit includes an electronic expansion valve, an air conditioning compressor and a condenser assembly; the battery cooling water circuit includes a battery water pump;

[0038] The control module is also used to control the speed of the air-conditioning compressor, the enabling of the battery water pump and the opening of the electronic expansion valve according to the detected temperature.

[0039] Optionally, the storage battery includes a power battery;

[0040] The battery management system further includes a current sensor and a single cell voltage sensor; the number of the single cell voltage sensors is the same as the number of single cells of the power battery;

[0041] The control module is used to enable the fuel cell system to charge the power battery through the DCDC module according to the information collected by the current sensor and the single cell voltage sensor;

[0042] The control module is also used to send a warning message to the user terminal and control the DCDC module to stop charging or reduce the charging power when detecting that the data of any single voltage sensor is abnormal.

[0043] In a second aspect, an embodiment of the present application provides a fuel cell vehicle, which includes the battery management system described in the first aspect.

[0044] Compared with the prior art, this application has the following beneficial effects:

[0045] When the user is far away from the fuel cell vehicle, the battery management system automatically monitors the power level. When the power level is too low, the battery management system can enable the user terminal to remind the user to charge. The user can charge the battery remotely, avoiding various problems such as inability to start due to low battery level. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 A schematic diagram of a battery management system provided in an embodiment of the present application;

[0048] Figure 2 A schematic diagram of a battery management system for a low-voltage battery provided in an embodiment of the present application;

[0049] Figure 3 A schematic diagram of a battery management system for a power battery provided in an embodiment of the present application;

[0050] Figure 4 A schematic diagram of calibration data of an open circuit voltage and state of charge of a single cell provided in an embodiment of the present application;

[0051] Figure 5 A schematic diagram of vehicle data displayed on a remote platform provided in an embodiment of the present application;

[0052] Figure 6 A schematic diagram of a remote platform displaying and monitoring power battery temperature data provided in an embodiment of the present application;

[0053] Figure 7 A schematic diagram of a remote platform displaying and monitoring the voltage of a single cell of a power battery provided in an embodiment of the present application;

[0054] Figure 8A schematic diagram of charging power data corresponding to a specific power battery temperature and a specific power level provided in an embodiment of the present application;

[0055] Figure 9 A schematic diagram of temperature control during a charging process provided in an embodiment of the present application;

[0056] Figure 10 A schematic diagram of test case data provided for an embodiment of the present application. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, 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. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described in the drawings here can be arranged and designed in various different configurations.

[0058] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0059] In the description of this application, it should be noted that:

[0060] Relational terms such as first and second, etc., are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations;

[0061] “Connection” should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0062] Figure 1 A battery management system is demonstrated, which is applied to fuel cell vehicles. The battery management system includes a control module, a DCDC module, a fuel cell system, and a battery.

[0063] The battery may include a low-voltage battery, such as a 12V battery. The battery may also include a power battery.

[0064] The low-voltage battery is used to supply power to the low-voltage loads of the fuel cell vehicle.

[0065] A power battery can be installed in a fuel cell vehicle. The power battery can be used to supplement the power output of the fuel cell vehicle when the power demand of the fuel cell vehicle exceeds the power that the fuel cell system can provide. For example, when going uphill, a larger power is required, and the output power of the fuel cell is limited. At this time, the power battery supplements the power.

[0066] The control module monitors the voltage of the battery, determines the battery power according to the voltage, and when the power is too low, sends the low power information remotely to the user terminal;

[0067] When a user terminal such as a mobile phone receives a low battery message, it provides the user with the option of sending a remote charging instruction;

[0068] When the control module receives a remote charging instruction from the user terminal, the fuel cell system charges the battery through the DCDC module.

[0069] Through the above steps, when the user is far away from the fuel cell vehicle, the battery management system automatically monitors the power level. When the power level is too low, the battery management system can enable the user terminal to remind the user to charge. The user can charge the battery remotely, avoiding various problems such as inability to start due to low battery level.

[0070] The existing battery management systems on the market have the disadvantage of limited monitoring range. Most of the existing battery management systems adopt local control mode, and the monitoring range is limited to the vicinity of the vehicle. Remote monitoring cannot be achieved, and various problems such as failure to start due to low battery power affect the user experience. Compared with the existing battery management systems on the market, this solution realizes remote monitoring and control of battery status and improves user experience.

[0071] Figure 2 The low-voltage battery is shown as an implementation of the above-mentioned battery. The control module may include a vehicle control unit (VCU), a battery management system (BMS), a passive entry and start system (PEPS), a fuel cell system controller (FCU) and a telematics box (T-BOX). The following control logic can be executed:

[0072] The VCU monitors the voltage status of the 12V battery in real time. When the built-in voltage sensor of the VCU detects that the battery voltage is lower than 10V, it will immediately send a warning message to the T-BOX. After receiving the warning message, the T-BOX uploads the information to the remote platform, for example, by means of the 4G network protocol.

[0073] After receiving the warning from T-BOX, the remote platform will immediately send a text message to the car owner through the communication network. The text message can also be replaced by an App message to remind the owner that the voltage of the vehicle's 12V battery is too low and needs to be charged in time.

[0074] At this time, the owner can choose to start the vehicle for charging by himself, or send a vehicle start command to the remote platform through the mobile phone APP. After the remote platform receives the start command, it forwards it to the T-BOX. T-BOX performs protocol conversion on the remote start command, and then sends a start message to PEPS and VCU to control the start of the vehicle's low-voltage and high-voltage systems. After the VCU sends a READY command, the FCU starts power generation and controls the DCDC module to convert the 700V voltage into a 12V voltage to charge the 12V battery. The conversion voltage of the DCDC module can be designed according to the relevant parameters of the fuel cell and power battery.

[0075] Figure 3 A power battery is shown as an implementation method of the above-mentioned storage battery. The BMS monitors the voltage and power of the power battery in real time, and sends a message containing voltage and power data to the T-BOX every 8 hours (it can also be replaced by other preset time lengths). After receiving the message, the T-BOX uploads the information to the remote platform (for example, through the 4G network protocol). After receiving the message, the remote platform sends a text message (the text message can also be replaced by an App message) to the owner through the communication network, reminding the power battery voltage and power too low, and needs to be charged in time to avoid the hydrogen fuel cell failing to start.

[0076] At this time, the owner can choose to start the vehicle for charging by himself, or send a vehicle start command to the remote platform through a mobile phone APP. After receiving the start command, the remote platform forwards it to the T-BOX. T-BOX performs protocol conversion on the remote start command, and then sends a start message to PEPS and VCU to control the start of the vehicle's low-voltage and high-voltage systems. After the VCU issues a READY command, the FCU starts generating electricity and controls the DCDC module to convert the 200V voltage to 700V voltage to charge the high-voltage power battery. The conversion voltage of the DCDC module can be designed according to the relevant parameters of the fuel cell and power battery.

[0077] A cooling circulation system can be set up in the power battery assembly. While charging the high-voltage power battery, the BMS monitors the inlet and outlet temperature sensor values ​​of the cooling circulation system (the inlet and outlet temperature sensor values ​​include Figure 3 The water inlet probe and water outlet probe of the water tank assembly in the water tank assembly), 16 sets of temperature sensor values ​​in the battery pack (the number of temperature sensors in the battery pack includes Figure 3 The battery probe in the battery pack), the voltage and current sensor values ​​of 192 single cells, and send them to T-BOX through messages to upload to the remote platform. The above-mentioned number of batteries 192 and the number of temperature sensors in the battery pack 16 can be replaced by other numbers.

[0078] The BMS accurately controls the charging process of 192 groups of single batteries based on the monitored temperature, voltage, battery charge, and current data and based on safety calibration parameters. The battery charge is the state of charge (SOC), which can be pre-calibrated based on the voltage, such as Figure 4 , Figure 4 The open circuit voltage (OCV) and state of charge calibration data of the single cell are displayed.

[0079] A data acquisition module can be set up, which includes the above-mentioned temperature, voltage, current and other sensors. The data acquisition module is responsible for real-time monitoring of key status information such as voltage, current, temperature, etc. of the battery. This information is obtained through high-precision sensors for subsequent processing and analysis. The data acquisition module also has a data preprocessing function, which can filter, amplify and other processes on the collected data to improve the accuracy and reliability of the data.

[0080] These data can be sent to remote platforms such as Figure 5 , the vehicle data displayed on the remote platform, such as Figure 6 , the remote platform displays the monitoring power battery temperature data, such as Figure 7 , the remote platform displays and monitors the voltage of the single cells of the power battery, Figure 7 Only some of the cells, cell 127 to cell 174 , are shown.

[0081] A control instruction generation module may be provided in the control module, and the control instruction generation module is responsible for generating accurate control instructions according to the actual state of the battery. The control instruction generation module may adopt a PID control algorithm to generate corresponding control instructions according to the deviation between the actual state of the battery and the target state. An execution control module may be provided in the control module, and the execution control module is responsible for receiving control instructions from the control instruction generation module, and driving the corresponding actuator to perform specific operations, and accurately adjusting the charging and discharging process of the battery according to the control instructions.

[0082] The application of PID control algorithm improves the control accuracy and response speed of the system, ensuring that the battery can operate in the best condition.

[0083] It can be run in the following workflow:

[0084] State judgment: First, based on the battery state information, judge the deviation between the actual state of the battery and the target state; (the state information and target state can be voltage, power or current)

[0085] PID calculation: Based on the deviation value, the PID control algorithm is used to calculate and obtain the corresponding control quantity; the proportional link is used to quickly respond to deviation changes, the integral link is used to eliminate static deviations, and the differential link is used to predict the deviation change trend;

[0086] Command generation: Generate precise control commands based on the calculated control quantity; these commands may include charging current for charging a battery, or discharging current for a fuel cell.

[0087] The control instruction generation module can also have an adaptive adjustment function. According to the actual state of the battery and changes in the use environment, the control instruction generation module can automatically adjust the PID control parameters based on temperature or power to ensure that the system can maintain excellent control performance under different working conditions. For example, when the temperature is high, the proportional link parameters in the PID control parameters are smaller. For example, compared with fast charging and normal charging, normal charging has smaller proportional link parameters.

[0088] The user can determine the charging mode based on the information provided by the remote platform. The charging modes include fast charging and normal charging. The information provided by the remote platform may include power and estimated charging time. The remote platform can process the battery status information into status summary information. The battery status information includes the voltage of all single cells and the status summary information includes the estimated charging time. The user can better judge whether to fast charge based on the estimated charging time.

[0089] like Figure 8 Under the conditions of a specific power battery temperature and a specific power quantity, corresponding charging power data can be set, and the corresponding charging power data under a specific power battery temperature and a specific power quantity are pre-calibrated and stored in the control module. Therefore, the control module can obtain the charging power according to the temperature and power of the power battery, so that the fuel cell system charges the power battery with the charging power through the DCDC module.

[0090] During the charging process, as well as the uncharged parking process, users can view the battery status information and the execution of control instructions in real time through the monitoring of the remote platform. At the same time, the remote platform can also have intelligent control functions, and can adaptively adjust the control strategy according to user needs and vehicle status. For example, when the user needs fast charging, the user terminal sends a fast charging instruction. When the remote platform receives the fast charging instruction from the user terminal, the remote platform sends a control signal to the control module, so that the charging current and voltage parameters can be adjusted to speed up the charging speed with greater charging power. Compared with the existing system with low intelligence, lack of intelligent control means and unable to make adaptive adjustments according to user needs and vehicle status, this solution can make adaptive adjustments according to user needs and vehicle status; when the vehicle is parked for a long time, the remote platform can start the automatic maintenance program to extend the service life of the battery.

[0091] During the charging process and the uncharging parking process, the control module can also be used to send a warning message to the user terminal through the remote platform when abnormal data from any single cell voltage sensor is detected (the single cell battery may be damaged or malfunction at this time), and control the DCDC module to stop charging or reduce the charging power.

[0092] Figure 9 A schematic diagram of the charging process regulation is shown, and the control module may also include an air conditioning controller. Figure 10 The test case data is shown. During the charging process, the VCU continuously monitors the battery temperature. Once the battery temperature is detected to be out of the normal range, the VCU will immediately send a cooling request to the air conditioning controller. After receiving the request, the air conditioning controller starts the compressor through a message instruction after an internal decision-making process, and sends an opening adjustment request to the VCU at the same time.

[0093] Subsequently, the VCU precisely controls the working status of the battery water pump and the electronic expansion valve on the heat exchanger through hard lines. The VCU detects the temperature of the corresponding position based on the power battery temperature probe, the water inlet temperature probe and the water outlet temperature probe, and controls the operation of the cooling circulation system. The cooling circulation system includes a condensing circuit, a heat exchanger and a battery cooling water circuit; the condensing circuit and the battery cooling water circuit exchange heat in the heat exchanger; the condensing circuit includes an electronic expansion valve, an air conditioning compressor and a condenser assembly; the battery cooling water circuit includes a battery water pump; Figure 10 , VCU controls the speed of the air-conditioning compressor, the enabling of the battery water pump and the opening of the electronic expansion valve according to the detected temperature.

[0094] This series of operations is designed to effectively cool the battery cooling circulating water in the heat exchanger by circulating the cooling medium, thereby reducing the battery temperature and ensuring that it remains within the optimal charging temperature range. This is of great significance in preventing safety accidents caused by excessive battery charging temperature.

[0095] Based on the above embodiments, the embodiments of the present application also provide a fuel cell vehicle, which includes the above battery management system.

[0096] In summary, the advantages of the battery management system are as follows:

[0097] 1. Integration of remote monitoring and control technologies

[0098] The remote monitoring and control technologies are deeply integrated to realize the remote real-time monitoring and intelligent control of vehicle batteries. The battery status data is collected in real time through the remote platform and uploaded to the host computer (user terminal such as the user's mobile phone) for analysis and processing; at the same time, the host computer generates instructions based on the processing results and controls the charging and discharging of the battery through the remote platform. This deep integration method improves the overall performance and control accuracy of the system. Compared with the existing remote control solutions, the existing remote control solutions have problems such as response delay and insufficient data transmission security. This solution can transmit in time through the remote platform and ensure data transmission security.

[0099] 2.PID intelligent control technology improves control accuracy and efficiency

[0100] The PID control algorithm is introduced, and the PID control parameters are dynamically adjusted according to the real-time status of the battery, realizing precise control of the battery charging and discharging process. Compared with the existing simple control strategies in the market, which cannot be precisely regulated according to the actual status of the battery, resulting in a certain impact on the charging and discharging efficiency and service life of the battery, this solution can be precisely regulated according to the real-time status of the battery, which is conducive to improving the charging and discharging efficiency and service life.

[0101] The PID control algorithm has the advantages of simple structure, easy implementation, strong robustness, etc. It can adapt well to the changes in battery performance and the uncertainty of the working environment. At the same time, by dynamically adjusting the PID control parameters, the control accuracy and efficiency can be further improved.

[0102] Although PID control algorithms have been widely used in the field of industrial automation, they are rarely used in remote monitoring and intelligent regulation of hydrogen fuel cell vehicle batteries, and most of their applications are concentrated at the local control level, which cannot give full play to their advantages in remote monitoring and intelligent regulation. This solution gives full play to their advantages in remote monitoring and intelligent regulation.

[0103] 3. Optimized design for vehicle application scenarios enhances the adaptability of the system

[0104] In view of the complex and changeable working environment of vehicle batteries, the remote capacity verification technology is optimized. By adopting high-precision, high-stability and high-reliability sensors and actuators, the adaptability and robustness of the system are improved. At the same time, by optimizing the design of communication modules and the selection of data transmission protocols, the real-time transmission and reliability of data are ensured.

[0105] 4. Reduce maintenance costs and improve economic benefits

[0106] By realizing remote real-time monitoring of vehicle batteries, combined with PID control algorithms and intelligent analysis and control algorithm control and other measures, the present invention can reduce maintenance costs and improve economic benefits. On the one hand, by accurately controlling the charging and discharging process, the service life of the battery can be extended and the replacement cost can be reduced; on the other hand, the number and cost of manual inspections and manual operations can be reduced through remote monitoring and control technology.

[0107] The above-described device and system embodiments are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. A person skilled in the art may understand and implement the present embodiment without creative effort.

[0108] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery management system, characterized in that: Applied to fuel cell vehicles, the battery management system includes a control module, a DCDC module, a fuel cell system, and a battery; The control module is used for: Monitor the voltage of the battery, determine the power of the battery according to the voltage, and when the power is too low, remotely send low power information to the user terminal; When receiving a remote charging instruction from a user terminal, causing the fuel cell system to charge the battery through the DCDC module; The user terminal is used for: When the low battery information is received, the user is provided with an option to send the remote charging instruction.

2. The battery management system according to claim 1, characterized in that: The storage battery includes a power battery; The control module stores charging power data corresponding to a pre-calibrated specific power battery temperature and a specific power level; The control module is used to obtain the temperature and power of the power battery, obtain the charging power according to the temperature and power of the power battery, and enable the fuel cell system to charge the power battery with the charging power through the DCDC module.

3. The battery management system according to claim 1, characterized in that: The control module and the user terminal are used for wireless communication with a remote platform; The control module is used to send the low power information to the remote platform, and the remote platform sends the low power information to the user terminal; The user terminal is used to send the remote charging instruction to the remote platform when receiving the remote charging instruction input by the user, and the remote platform sends the remote charging instruction to the control module.

4. The battery management system according to claim 3, characterized in that: The control module is used to obtain the status information of the battery and send the status information to the remote platform; the status information includes the voltage of each single battery; The remote platform monitors according to the status information, processes the status information into status summary information, and sends the status summary information to the user terminal; When the remote platform receives a fast charging instruction from the user terminal, the remote platform sends a control signal to the control module; The control module is used for: When receiving a remote charging instruction from a user terminal, causing the fuel cell system to charge the storage battery at a first power through the DCDC module; When the control signal is received, the fuel cell system is enabled to charge the battery with a second power through the DCDC module according to the control signal; the second power is greater than the first power.

5. The battery management system according to claim 1, characterized in that: The storage battery includes a power battery and a low-voltage storage battery; The low-voltage battery is used to supply power to the low-voltage load of the fuel cell vehicle; The power battery is used to supplement the power output of the fuel cell vehicle when the power demand of the fuel cell vehicle exceeds the power that can be provided by the fuel cell system.

6. The battery management system according to claim 1, characterized in that: The control module is used for: Acquiring an actual state and a target state of the battery, and calculating a deviation between the actual state and the target state of the battery; Based on the deviation, a PID control algorithm is used to calculate and obtain a control amount; A control instruction is generated according to the calculated control amount, and the control instruction is a charging current.

7. The battery management system according to claim 1, characterized in that: The storage battery includes a power battery; The battery management system further includes a power battery temperature probe, a cooling circulation system, a water inlet temperature probe and a water outlet temperature probe; the number of the power battery temperature probes is greater than 1; The control module is also used to detect the temperatures of corresponding positions according to the power battery temperature probe, the water inlet temperature probe and the water outlet temperature probe, and control the operation of the cooling circulation system.

8. The battery management system according to claim 7, characterized in that: The cooling circulation system includes a condensing circuit, a heat exchanger and a battery cooling water circuit; the condensing circuit and the battery cooling water circuit exchange heat in the heat exchanger; The condensing circuit includes an electronic expansion valve, an air conditioning compressor and a condenser assembly; the battery cooling water circuit includes a battery water pump; The control module is also used to control the speed of the air-conditioning compressor, the enabling of the battery water pump and the opening of the electronic expansion valve according to the detected temperature.

9. The battery management system according to claim 1, characterized in that: The storage battery includes a power battery; The battery management system further includes a current sensor and a single cell voltage sensor; the number of the single cell voltage sensors is the same as the number of single cells of the power battery; The control module is used to enable the fuel cell system to charge the power battery through the DCDC module according to the information collected by the current sensor and the single cell voltage sensor; The control module is also used to send a warning message to the user terminal and control the DCDC module to stop charging or reduce the charging power when detecting that the data of any single voltage sensor is abnormal.

10. A fuel cell vehicle, characterized in that: The fuel cell vehicle comprises the battery management system according to any one of claims 1 to 9.

Images