Vehicle-mounted battery control method, vehicle-mounted battery system and electric vehicle

Abstract

The invention relates to a vehicle-mounted battery control method, a vehicle-mounted battery system and an electric vehicle. The method comprises the following steps: receiving a first voltage obtained by detecting a vehicle battery by a battery energy control module; judging whether the battery energy control module breaks down or not according to the first voltage; and when it is judged that the battery energy control module breaks down, the battery is controlled to quit the current working state, so that a secondary protection function of the battery is established on the basis of the battery energy control module, and the problem that the battery is overcharged or overdischarged due to the fact that the battery energy control module breaks down is solved.

Description

Technical Field

[0001] The present application relates to the field of automobile battery control, and in particular to a vehicle battery control method, a vehicle battery system and an electric vehicle. Background Art

[0002] New energy vehicles, especially electric vehicles, have developed rapidly in recent years as an important means to reduce carbon emissions and address climate change. One of its core components is the battery system, which determines the vehicle's range and overall performance. Advances in battery technology have significantly improved energy density and cycle life, but have also brought new challenges in safety management and performance optimization. The Battery Energy Control Module (BECM) plays a vital role in this, responsible for monitoring the battery status, controlling the charging and discharging process, and ensuring operational safety.

[0003] At present, when new energy vehicles are charging or discharging, the battery energy control module monitors the battery pack voltage in the new energy vehicle. However, if the battery energy control module fails, the battery safety protection control will be lost, which will cause the battery to be overcharged or over-discharged, and in severe cases, it will cause irreparable damage.

[0004] Regarding the related technologies, the batteries of new energy vehicles have the problem of overcharging or over-discharging, and no effective solution has been proposed yet. Summary of the invention

[0005] Based on this, it is necessary to provide a vehicle-mounted battery control method, a vehicle-mounted battery system and an electric vehicle that can prevent battery overcharging or over-discharging in response to the above technical problems.

[0006] In a first aspect, the present application provides a vehicle battery control method, comprising:

[0007] Receiving a first voltage detected by a battery energy control module of a vehicle battery;

[0008] Determining whether the battery energy control module fails according to the first voltage;

[0009] When it is determined that the battery energy control module fails, the battery is controlled to exit the current working state.

[0010] In one embodiment, judging whether the battery energy control module fails according to the first voltage includes:

[0011] Detecting a DC voltage across the battery to obtain a second voltage;

[0012] The first voltage is compared with the second voltage, and if the difference between the first voltage and the second voltage exceeds a voltage threshold, it is determined that the battery energy control module fails.

[0013] In one embodiment, judging whether the battery energy control module fails according to the first voltage includes:

[0014] Determining whether the first voltage sent by the battery energy control module remains unchanged for a preset time;

[0015] If the first voltage sent by the battery energy control module does not change for a preset time, it is determined that the battery energy control module fails.

[0016] In one embodiment, before determining whether the first voltage sent by the battery energy control module remains unchanged for a preset time, the method further includes:

[0017] Obtaining the full load capacity of the battery and the boost rate of the charging current;

[0018] The preset time is calculated according to the full load power and the boost rate of the charging current.

[0019] In one embodiment, when it is determined that the battery energy control module fails, controlling the battery to exit the current working state includes:

[0020] When the vehicle is in an AC charging state, the high voltage relay is cut off to stop AC charging of the battery.

[0021] In one embodiment, when it is determined that the battery energy control module fails, controlling the battery to exit the current working state includes:

[0022] When the vehicle is in a driving condition, the high voltage relay is cut off to prevent the battery from discharging.

[0023] In one embodiment, when the vehicle is in a driving condition, controlling the battery to exit a current working state further includes:

[0024] Determine whether the current vehicle speed is greater than the vehicle speed threshold;

[0025] When it is determined that the current vehicle speed is not greater than the vehicle speed threshold, the vehicle is controlled to enter the P gear state, and the high-voltage relay is cut off to prevent the battery from discharging.

[0026] In one embodiment, the method further comprises:

[0027] When it is determined that the current vehicle speed is greater than the vehicle speed threshold, the driving power of the vehicle is linearly controlled until the vehicle speed drops below the vehicle speed threshold, the vehicle is controlled to enter the P gear state, and the high-voltage relay is cut off to prevent the battery from discharging.

[0028] In a second aspect, the present application provides a vehicle-mounted battery system, comprising: a control module, a battery energy control module and a battery, wherein the control module is connected to the battery energy control module and the battery respectively; wherein:

[0029] The battery energy control module is used to detect the DC voltage across the battery to obtain a first voltage;

[0030] The control module is used to receive the first voltage, determine whether the battery energy control module fails according to the first voltage, and control the battery to exit a current working state if it is determined that the battery energy control module fails.

[0031] In one embodiment, the control module includes a first control unit, a second control unit and a high-voltage relay; the first control unit and the second control unit are respectively connected to the high-voltage relay, and the high-voltage relay is connected to the battery; wherein,

[0032] The first control unit is used to detect the DC voltage across the battery when the vehicle is in an AC charging state, and to cut off the high-voltage relay when it is determined that the battery energy control module fails;

[0033] The second control unit is used to detect the DC voltage across the battery when the vehicle is in a driving condition, and to cut off the high-voltage relay when it is determined that the battery energy control module fails.

[0034] In a third aspect, the present application provides an electric vehicle, comprising: a vehicle body, in which the vehicle-mounted battery system described in the second aspect is installed.

[0035] The above-mentioned vehicle-mounted battery control method, vehicle-mounted battery system and electric vehicle receive the first voltage obtained by the battery energy control module to detect the vehicle battery; determine whether the battery energy control module fails based on the first voltage; and control the battery to exit the current working state when it is determined that the battery energy control module fails. In this way, a secondary protection function of the battery is established on the basis of the battery energy control module, which solves the problem of battery overcharging or over-discharging caused by a failure of the battery energy control module. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1A schematic diagram of the structure of a vehicle-mounted battery system in one embodiment;

[0037] Figure 2 is a flow chart of a vehicle battery control method in one embodiment;

[0038] Figure 3 A schematic diagram of the structure of a vehicle-mounted battery system in another embodiment;

[0039] Figure 4 is a flow chart of a vehicle-mounted battery control method when the vehicle is in an AC charging condition in one embodiment;

[0040] Figure 5 The figure is a flow chart of a vehicle battery control method when the vehicle is in a driving condition in one embodiment. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the", "these" and the like in this application do not represent quantitative restrictions, and they can be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. Usually, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0043] The vehicle-mounted battery control method provided in the present application is applied to new energy vehicles, especially for vehicles in AC charging conditions (charging state) or driving conditions (discharging state). Traditional battery charging and discharging is mainly managed by a battery energy control module (BECM). Specifically, the battery energy control module detects the DC voltage at both ends of the vehicle battery pack, judges the detected DC voltage, and determines whether to cut off the high-voltage relay based on the judgment result. If the battery energy control module detects that the current battery has an overcharge or over-discharge problem, the high-voltage relay is cut off to stop charging or discharging. Since the battery energy control module may fail, once the battery energy control module fails, it will not be able to actively cut off the high-voltage relay, that is, it will be out of control, resulting in overcharging or over-discharging of the battery, which is easy to cause irreparable damage.

[0044] In view of the above problems, this embodiment provides a vehicle-mounted battery system. Figure 1 is a schematic diagram of the structure of the vehicle-mounted battery system of this embodiment, as shown in Figure 1 The system includes: a control module, a battery energy control module and a battery, wherein the control module is connected to the battery energy control module and the battery respectively; wherein the battery energy control module is used to detect the DC voltage at both ends of the battery to obtain a first voltage; the control module is used to receive the first voltage, and determine whether the battery energy control module fails according to the first voltage, and when it is determined that the battery energy control module fails, control the battery to exit the current working state. Figure 1 On the basis of Figure 2 A corresponding vehicle battery control method is provided, which runs on Figure 1 The control module comprises the following steps:

[0045] Step S101 : A control module receives a first voltage detected by a battery energy control module of a vehicle battery.

[0046] The battery energy control module detects the DC voltage of the high-voltage busbar of the vehicle's internal circuit to obtain a first voltage. Specifically, the first voltage includes the battery voltage when the vehicle is in an AC charging state, or the battery voltage when the vehicle is in a driving state.

[0047] Step S102: The control module determines whether a battery energy control module fails according to the first voltage.

[0048] When the battery energy control module fails, the first voltage detected by it will be inaccurate. The following provides optional fault judgment conditions.

[0049] Fault condition A: The control module detects the DC voltage at both ends of the battery to obtain a second voltage; compares the first voltage with the second voltage, and if the difference between the first voltage and the second voltage exceeds the voltage threshold, it is determined that the battery energy control module has a fault. The voltage threshold can be in the range of 5-15V.

[0050] Fault condition B: The control module determines whether a fault occurs in the battery energy control module based on the first voltage, including: determining whether the first voltage sent by the battery energy control module remains unchanged for a preset time; if the first voltage sent by the battery energy control module remains unchanged for a preset time, it is determined that a fault occurs in the battery energy control module.

[0051] Under normal circumstances, when the vehicle is in AC charging condition, the charging current will rise, and the first voltage obtained by the battery energy control module when detecting the battery should change. If the first voltage output by the battery energy control module does not change, it means that the battery energy control module has failed. The preset time can be calculated by the following method: obtain the full load capacity of the battery and the boost rate of the charging current; calculate the preset time according to the full load capacity and the boost rate of the charging current. For example, the preset time calculated according to this method is 15 minutes.

[0052] In addition to the above judgment method, in some optional implementation schemes, the control module can also determine whether a fault occurs by monitoring the communication status of the battery energy control module. If the control module does not receive any data or signal sent by the battery energy control module within a period of time, or the received data is obviously illogical (for example, the first voltage suddenly jumps), it can be determined that the battery energy control module may have a communication failure or a problem with the internal processing unit.

[0053] In addition, the control module can further check whether the change trend of the first voltage is consistent with expectations. For example, when the vehicle is in the process of AC charging, the battery voltage should gradually increase as the charging progresses; and during the discharge process, the battery voltage should gradually decrease. If the detected change trend of the first voltage does not match these preset patterns, such as abnormal voltage fluctuations, long-term unchanged, or unreasonable rise / fall, it may be that the battery energy control module is faulty.

[0054] Step S103, when it is determined that the battery energy control module fails, control the battery to exit the current working state.

[0055] Exemplarily, when the vehicle is in an AC charging condition, if the control module detects that a battery energy control module fails, the control module cuts off the high-voltage relay and stops AC charging of the battery.

[0056] Exemplarily, when the vehicle is in a driving condition, if the control module detects that a battery energy control module fails, the control module cuts off the high-voltage relay to prevent the battery from discharging.

[0057] In the above steps S101 to S103, the control module is connected to the battery energy control module and the battery respectively, receives in real time the first voltage obtained by the battery energy control module when detecting the battery, and determines whether the battery energy control module fails based on the first voltage. If it is determined that the battery energy control module fails, the control module controls the battery to exit the current working state. In this way, a secondary protection function of the battery is established on the basis of the battery energy control module, which solves the problem of battery overcharging or over-discharging caused by a failure of the battery energy control module.

[0058] In one embodiment, when the vehicle is in a driving condition, controlling the battery to exit the current working state can also be achieved by the following method:

[0059] Determine whether the current vehicle speed is greater than the speed threshold; if it is determined that the current vehicle speed is not greater than the speed threshold, the vehicle is controlled to enter the P gear state, and the high-voltage relay is cut off to prevent battery discharge. If it is determined that the current vehicle speed is greater than the speed threshold, the vehicle's driving power is linearly controlled until the speed drops below the speed threshold, the vehicle is controlled to enter the P gear state, and the high-voltage relay is cut off to prevent battery discharge.

[0060] In this embodiment, considering the user's driving needs and safety of the vehicle in the discharge state, the control module will not directly take braking measures, but will first judge the current vehicle speed and take corresponding braking measures based on the current vehicle driving state. If it is judged that the current vehicle speed is not greater than the vehicle speed threshold, it means that the vehicle is in a low-speed driving state, and the brakes can be applied directly, that is, the vehicle is controlled to enter the P gear state, and the high-voltage relay is cut off to prevent the battery from discharging. On the contrary, if it is judged that the current vehicle speed is greater than the vehicle speed threshold, it means that the vehicle is in a high-speed driving state. If direct braking is applied at this time, the user experience is poor, and in serious cases, safety issues may arise. Therefore, when taking measures at this time, the speed is gradually reduced, and then the vehicle is controlled to enter the P gear state, and the high-voltage relay is cut off to prevent the battery from discharging.

[0061] The speed threshold may be 2-4 kph, for example, 3 kph. The speed threshold may be any value that allows the vehicle to move without causing the vehicle to travel too fast and cause safety problems. Therefore, the speed threshold may also be other appropriate values, which are not limited in this embodiment.

[0062] Among them, when the driving power of the vehicle is linearly controlled, the speed of the vehicle can be smoothly reduced by gradually reducing the power provided to the motor, avoiding discomfort or potential safety risks caused by sudden power cut-off. Specifically, the linear control of driving power can be achieved in the following ways:

[0063] Gradual Current Reduction: The output torque is reduced by gradually reducing the current supplied to the electric motor, thereby reducing the vehicle speed smoothly. This method ensures that the deceleration process is smooth and predictable.

[0064] Adjust the PWM (Pulse Width Modulation) signal: When using PWM technology to control the motor speed, the average supply voltage can be reduced by gradually reducing the duty cycle of the PWM signal, thereby reducing the motor speed and vehicle speed.

[0065] Utilize regenerative braking system: In some cases, regenerative braking technology can also be combined to convert part of the kinetic energy into electrical energy during deceleration and feed it back to the battery, while also playing a role in deceleration. This not only helps to smooth deceleration, but also improves energy efficiency.

[0066] Software algorithm optimization: Use control algorithms, such as PID controllers, to dynamically adjust the motor input power according to the difference between the current vehicle speed and the target speed to achieve a predetermined deceleration curve.

[0067] In this embodiment, the driving power of the vehicle is linearly controlled, so that the entire deceleration process can maintain a relatively uniform rate of change, so that the driver can experience a natural and smooth deceleration experience, rather than a sudden and drastic deceleration, which is conducive to improving driving safety and passenger comfort. When the vehicle speed drops below the set safety threshold (for example, 3kph), further measures are taken, such as switching to P gear and cutting off the high-voltage relay, to completely stop the vehicle and ensure battery safety.

[0068] In one embodiment, Figure 3 Another on-board battery system is provided, such as Figure 3 As shown, in the vehicle-mounted battery system, the control module includes a first control unit, a second control unit and a high-voltage relay; the first control unit and the second control unit are respectively connected to the high-voltage relay, and the high-voltage relay is connected to the battery; wherein the first control unit is used to detect the DC voltage across the battery when the vehicle is in an AC charging condition, and to cut off the high-voltage relay when it is determined that a fault occurs in the battery energy control module; the second control unit is used to detect the DC voltage across the battery when the vehicle is in a driving condition, and to cut off the high-voltage relay when it is determined that a fault occurs in the battery energy control module.

[0069] The terms "module", "unit", "sub-unit" and the like used above may be a combination of software and / or hardware that implements the predetermined functions. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated. It should be noted that the above-mentioned modules may be functional modules or program modules, and may be implemented in software or hardware. For modules implemented in hardware, the above-mentioned modules may be located in the same processor; or the above-mentioned modules may be located in different processors in any combination.

[0070] In one embodiment, the first control unit may be an on-board charger (OBC), and the second control unit may be an inverter ERAD module (IEM) or a vehicle computational unit (VCU). In some cases, the second control unit is a VCU because the VCU can execute the entry into the P gear.

[0071] Combination Figure 3 , in one embodiment, Figure 4 A flow chart of a vehicle battery control method when the vehicle is in AC charging condition is provided. Figure 4 As shown, the process includes the following steps:

[0072] Step S201, OBC receives in real time a first voltage obtained by BECM detecting a high-voltage side bus;

[0073] Step S202, the OBC continuously monitors the first voltage and determines whether the BECM is faulty according to the first voltage; if the BECM is faulty, step S203 is executed; otherwise, step S204 is executed;

[0074] Step S203, cutting off the high voltage relay, preventing the battery from charging, and recording the fault code;

[0075] Step S204, maintain the current AC charging state, and return to step S201.

[0076] Among them, in step S202, if the OBC monitors a certain difference between the first voltage and the second voltage for 5 seconds, or monitors that the first voltage does not change for 15 minutes, it is determined that the BECM is faulty. In step S203, the fault code is used to record the cause of the fault to facilitate subsequent investigation, such as stopping AC charging due to a BECM fault.

[0077] Combination Figure 3 , in one embodiment, Figure 5A flow chart of a vehicle battery control method when the vehicle is in a driving condition is provided. Figure 5 As shown, the process includes the following steps:

[0078] Step S301, the IEM / VCU receives in real time a first voltage obtained by the BECM detecting the high-voltage side bus;

[0079] Step S302, the IEM / VCU continuously monitors the first voltage and determines whether the BECM is faulty according to the first voltage; if the BECM is faulty, step S303 is executed; otherwise, step S306 is executed;

[0080] Step S303, IEM / VCU determines whether the current vehicle speed is greater than 3kph; if so, execute step S304; otherwise, execute step S305;

[0081] Step S304, controlling the driving power of the vehicle to perform linear control until the vehicle speed drops below 3 kph, controlling the vehicle to enter the P gear state, and cutting off the high-voltage relay to prevent the battery from discharging;

[0082] Step S305, controlling the vehicle to enter the P gear state, and cutting off the high-voltage relay to prevent the battery from discharging;

[0083] Step S306, maintain the current driving state and return to step S301.

[0084] In step S302, if the IEM / VCU detects a certain difference between the first voltage and the second voltage for 5 seconds, or detects no change in the first voltage for 15 minutes, it is determined that the BECM is faulty.

[0085] In one embodiment, an electric vehicle is also provided, comprising: a vehicle body, in which a vehicle-mounted battery system of any of the above embodiments is installed. In the vehicle-mounted battery system of the vehicle, a control module is connected to a battery energy control module and a battery respectively, receives a first voltage obtained by the battery energy control module detecting the battery in real time, and determines whether the battery energy control module fails according to the first voltage. If it is determined that the battery energy control module fails, the control module controls the battery to exit the current working state, so that a secondary protection function of the battery is established on the basis of the battery energy control module, and solves the problem of overcharging or over-discharging of the battery due to a failure of the battery energy control module.

[0086] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0087] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A vehicle battery control method, characterized in that: include: Receiving a first voltage detected by a battery energy control module of a vehicle battery; Determining whether the battery energy control module fails according to the first voltage; When it is determined that the battery energy control module fails, the battery is controlled to exit the current working state.

2. The vehicle-mounted battery control method according to claim 1, characterized in that: Determining whether the battery energy control module fails according to the first voltage includes: Detecting a DC voltage across the battery to obtain a second voltage; The first voltage is compared with the second voltage, and if the difference between the first voltage and the second voltage exceeds a voltage threshold, it is determined that the battery energy control module fails.

3. The vehicle-mounted battery control method according to claim 1, characterized in that: Determining whether the battery energy control module fails according to the first voltage includes: Determining whether the first voltage sent by the battery energy control module remains unchanged for a preset time; If the first voltage sent by the battery energy control module does not change for a preset time, it is determined that the battery energy control module fails.

4. The vehicle-mounted battery control method according to claim 3, characterized in that: Before determining whether the first voltage sent by the battery energy control module remains unchanged for a preset time, the method further includes: Obtaining the full load capacity of the battery and the boost rate of the charging current; The preset time is calculated according to the full load power and the boost rate of the charging current.

5. The vehicle-mounted battery control method according to claim 1, characterized in that: When it is determined that the battery energy control module fails, controlling the battery to exit the current working state includes: When the vehicle is in an AC charging state, the high voltage relay is cut off to stop AC charging of the battery.

6. The vehicle-mounted battery control method according to claim 1, characterized in that: When it is determined that the battery energy control module fails, controlling the battery to exit the current working state includes: When the vehicle is in a driving condition, the high voltage relay is cut off to prevent the battery from discharging.

7. The vehicle-mounted battery control method according to claim 6, characterized in that: When the vehicle is in a driving condition, controlling the battery to exit a current working state further includes: Determine whether the current vehicle speed is greater than the vehicle speed threshold; When it is determined that the current vehicle speed is not greater than the vehicle speed threshold, the vehicle is controlled to enter the P gear state, and the high-voltage relay is cut off to prevent the battery from discharging.

8. The vehicle-mounted battery control method according to claim 7, characterized in that: The method further comprises: When it is determined that the current vehicle speed is greater than the vehicle speed threshold, the driving power of the vehicle is linearly controlled until the vehicle speed drops below the vehicle speed threshold, the vehicle is controlled to enter the P gear state, and the high-voltage relay is cut off to prevent the battery from discharging.

9. A vehicle-mounted battery system, characterized in that: include: control module, battery energy control module and battery, the control module is connected to the battery energy control module and the battery respectively; wherein, The battery energy control module is used to detect the DC voltage across the battery to obtain a first voltage; The control module is used to receive the first voltage, determine whether the battery energy control module fails according to the first voltage, and control the battery to exit a current working state if it is determined that the battery energy control module fails.

10. The vehicle-mounted battery system according to claim 9, characterized in that: The control module includes a first control unit, a second control unit and a high-voltage relay; the first control unit and the second control unit are respectively connected to the high-voltage relay, and the high-voltage relay is connected to the battery; wherein, The first control unit is used to detect the DC voltage across the battery when the vehicle is in an AC charging state, and to cut off the high-voltage relay when it is determined that the battery energy control module fails; The second control unit is used to detect the DC voltage across the battery when the vehicle is in a driving condition, and to cut off the high-voltage relay when it is determined that the battery energy control module fails.

11. An electric vehicle, characterized in that: include: A vehicle body, wherein the vehicle-mounted battery system according to any one of claims 9 to 10 is installed in the vehicle body.

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