State control method, device and system, vehicle and equipment

Abstract

The invention relates to a state control method, device and system, a vehicle and equipment, and relates to the technical field of vehicles. The method is applied to the vehicle, the vehicle comprises a battery management system (BMS) acquisition circuit, the BMS acquisition circuit is provided with a plurality of acquisition loops, the acquisition loops are used for detecting the insulation state of the BMS, and the method comprises the steps that under the condition that a power battery of the vehicle is in a high-voltage power-on state, the vehicle state and first voltage are obtained; the first voltage comprises voltage corresponding to each acquisition loop; and based on the first voltage and / or the vehicle state, the state of the BMS acquisition circuit and / or the state of the power battery are / is controlled. Therefore, the problems of virtual voltage and insulation imbalance in the battery system in the prior art can be solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, in particular to the field of vehicle battery technology, and specifically to a state control method, device, system, vehicle and equipment. Background Art

[0002] As the implementation unit of the battery safety function of new energy vehicles, the importance of the battery management system (BMS) is self-evident. However, due to the hardware design problem of the BMS motherboard, the internal voltage acquisition channel is incorporated into the high-voltage circuit, resulting in the BMS failing to meet the safety requirements of low voltage and insulation detection functions, thus posing a serious threat to vehicle safety.

[0003] A related technology proposes to optimize the hardware design and realize the normal operation of the insulation detection by controlling the first switch and / or the second switch to conduct the insulation circuit, but this method is relatively costly.

[0004] Another related technology proposes that an insulation detection module detects the working voltage of the high-voltage circuit system in real time and accurately during the normal driving of the electric vehicle, but this method cannot effectively solve the problems of virtual voltage and insulation imbalance. Summary of the invention

[0005] The present application provides a state control method, device, system, vehicle and equipment to at least solve the technical problems of virtual voltage and insulation imbalance in the battery system in the related art. The technical solution of the present application is as follows:

[0006] According to a first aspect provided by the present application, a state control method is provided, which is applied to a vehicle. The vehicle includes a battery management system BMS acquisition circuit, and the BMS acquisition circuit has multiple acquisition circuits. The acquisition circuit is used to detect the insulation state of the BMS. The method includes: when the power battery of the vehicle is powered on at high voltage, obtaining the vehicle state and a first voltage; the first voltage includes the voltage corresponding to each acquisition circuit; based on the first voltage and / or the vehicle state, controlling the state of the BMS acquisition circuit and / or the state of the power battery.

[0007] According to the above-mentioned technical means, the present application can obtain the vehicle status and the first voltage when the vehicle's power battery is powered on at high voltage, wherein the first voltage is the voltage of the corresponding acquisition circuit, so as to further control the status of the BMS acquisition circuit and the status of the power battery based on the first voltage and the vehicle status, that is, to control the switches in the BMS acquisition circuit and the discharge of the battery, to avoid insulation detection failure and virtual voltage problems, to ensure vehicle safety, and to enable the vehicle's BMS to meet the safety requirements of electric vehicles after a collision.

[0008] In a possible manner, the vehicle state includes a normal state and a collision state.

[0009] According to the above technical means, the present application can control the state of the BMS acquisition circuit and the state of the power battery, as well as the discharge of the battery when the vehicle is in a normal state or a collision state, thereby avoiding insulation detection failure and virtual voltage problems in the vehicle under various states, ensuring vehicle safety, and enabling the vehicle's BMS to meet the safety requirements of electric vehicles after a collision.

[0010] In one possible manner, before controlling the state of the BMS acquisition circuit and / or the state of the power battery based on the first voltage and / or the vehicle state, the method also includes: judging whether the target acquisition circuit meets the normal opening and closing conditions of the relay based on the voltage corresponding to the target acquisition circuit included in the first voltage; the normal opening and closing conditions of the relay represent the disconnection or closing conditions that the relay in the BMS acquisition circuit normally meets when the power battery is in a high-voltage power-on state; when the normal opening and closing conditions of the relay are met, the target acquisition circuit is controlled to be disconnected, and the steps of controlling the state of the BMS acquisition circuit and / or the state of the power battery are executed.

[0011] According to the above technical means, the present application can determine whether the target acquisition circuit meets the normal opening and closing conditions of the relay before controlling the state of the BMS acquisition circuit and / or the state of the power battery, that is, determine whether the current high-voltage discharge condition is met to avoid the occurrence of safety accidents.

[0012] In one possible manner, the acquisition circuit in the BMS acquisition circuit includes a first acquisition circuit, a second acquisition circuit and a third acquisition circuit; the first acquisition circuit is the acquisition circuit inside the first relay in the BMS acquisition circuit; the second acquisition circuit is the acquisition circuit outside the first relay; the third acquisition circuit is the voltage outside the second relay in the BMS acquisition circuit; the target acquisition circuit is the third acquisition circuit; based on the voltage corresponding to the target acquisition circuit included in the first voltage, judging whether the target acquisition circuit meets the normal opening and closing conditions of the relay, including: judging whether the voltage corresponding to the third acquisition circuit is less than the first voltage threshold, if the voltage corresponding to the third acquisition circuit is less than the first voltage threshold, then determining that the target acquisition circuit meets the normal opening and closing conditions of the relay.

[0013] According to the above technical means, the present application can determine whether the voltage corresponding to the third acquisition circuit is less than the first voltage threshold, and whether the mechanical end of the second relay is in a long-term closed fault, that is, whether the current situation meets the high-voltage discharge condition to ensure vehicle safety.

[0014] In one possible approach, if the target acquisition circuit does not meet the normal opening and closing conditions of the relay, it is determined that there is a fault in the BMS acquisition circuit and the power battery is powered off.

[0015] According to the above technical means, the present application can determine that there is a fault in the BMS acquisition circuit when the third acquisition circuit does not meet the normal opening and closing conditions of the relay, so as to power off the power battery to avoid high-voltage discharge through the power battery when it does not meet the high-voltage discharge requirements, thereby ensuring vehicle safety.

[0016] In one possible manner, based on the first voltage and / or the vehicle state, the state of the BMS acquisition circuit and / or the state of the power battery is controlled, including: based on the first voltage and / or the vehicle state, judging whether the acquisition circuit meets the normal conditions for high-voltage discharge; when the normal conditions for high-voltage discharge are met, adjusting the closed states of the first acquisition circuit and the second acquisition circuit based on a preset period.

[0017] According to the above technical means, the present application can adjust the closed state of the first acquisition circuit and the second acquisition circuit based on a preset cycle when the normal conditions of high-voltage discharge are met, that is, only one second acquisition circuit is kept closed to avoid insulation imbalance caused by opening the acquisition circuits at the same time.

[0018] In one possible manner, when normal conditions for high-voltage discharge are not met, the BMS acquisition circuit is disconnected and the power battery is powered off; disconnecting the BMS acquisition circuit includes disconnecting the first relay, and disconnecting the first acquisition circuit and the second acquisition circuit.

[0019] According to the above technical means, the present application can avoid the danger caused by the virtual voltage of the vehicle BMS acquisition circuit under low voltage state by disconnecting the BMS acquisition circuit and powering off the power battery when the vehicle does not meet the normal conditions of high voltage discharge.

[0020] In one possible manner, the normal condition for high-voltage discharge includes: the vehicle is in a normal state, and the voltage of the first acquisition channel or the voltage of the second acquisition circuit is not greater than a second voltage threshold.

[0021] According to the second aspect provided by the present application, a state control device is provided, the device including: an acquisition unit and a control unit; the acquisition unit is used to acquire the vehicle state and the first voltage when the power battery of the vehicle is powered on at high voltage; the first voltage includes the voltage corresponding to each acquisition circuit; the control unit is used to control the state of the BMS acquisition circuit and / or the state of the power battery based on the first voltage and / or the vehicle state.

[0022] In one possible manner, the device also includes: a judgment unit; a judgment unit, used to judge whether the target acquisition circuit meets the normal opening and closing conditions of the relay based on the voltage corresponding to the target acquisition circuit included in the first voltage; the normal opening and closing conditions of the relay represent the disconnection or closing conditions that the relay in the BMS acquisition circuit normally meets when the power battery is in a high-voltage power-on state; the control unit is also used to control the target acquisition circuit to be disconnected when the normal opening and closing conditions of the relay are met, and execute the steps of controlling the state of the BMS acquisition circuit and / or the state of the power battery.

[0023] In one possible manner, the judgment unit is specifically used to: judge whether the voltage corresponding to the third acquisition circuit is less than the first voltage threshold; if the voltage corresponding to the third acquisition circuit is less than the first voltage threshold, determine that the target acquisition circuit meets the normal opening and closing conditions of the relay.

[0024] In one possible manner, the judgment unit is specifically used to: if the BMS acquisition circuit does not meet the normal opening and closing conditions of the relay, determine that there is a fault in the BMS acquisition circuit and power off the power battery.

[0025] In one possible manner, the judgment unit is further used to judge whether the acquisition circuit meets the normal conditions for high-voltage discharge based on the first voltage and / or the vehicle state; the control unit is further used to adjust the closed state of the first acquisition circuit and the second acquisition circuit based on a preset period when the normal conditions for high-voltage discharge are met.

[0026] In one possible manner, the control unit is also used to disconnect the BMS acquisition circuit and power off the power battery when normal conditions for high-voltage discharge are not met; disconnecting the BMS acquisition circuit includes disconnecting the first relay, and disconnecting the first acquisition circuit and the second acquisition circuit.

[0027] According to the third aspect provided by the present application, a state control system is provided, including: a state control device and a BMS acquisition circuit; the state control device is used to obtain the vehicle state and the first voltage in the BMS acquisition circuit when the power battery of the vehicle is powered on at high voltage; the first voltage is the voltage of the corresponding acquisition circuit; the state control device is also used to control the state of the BMS acquisition circuit and the state of the power battery based on the first voltage and the vehicle state.

[0028] According to a fourth aspect provided by the present application, a vehicle is provided, including a state control system.

[0029] According to the fifth aspect provided by the present application, an electronic device is provided, comprising: a processor; a memory for storing processor executable instructions; wherein the processor is configured to execute instructions to implement the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0030] According to the sixth aspect provided by the present application, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the method in the above-mentioned first aspect and any possible implementation method thereof.

[0031] According to the seventh aspect provided by the present application, a computer program product is provided, the computer program product comprising computer instructions, and when the computer instructions are executed on an electronic device, the electronic device executes the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0032] It should be noted that the technical effects brought about by any implementation method in the second to seventh aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0035] Figure 1 is a BMS voltage acquisition control strategy architecture diagram according to an exemplary embodiment;

[0036] Figure 2 is a schematic diagram of a BMS internal acquisition loop architecture according to an exemplary embodiment;

[0037] Figure 3 is a hardware architecture diagram of a BMS according to an exemplary embodiment;

[0038] Figure 4 is a schematic diagram of a collection loop according to an exemplary embodiment;

[0039] Figure 5 is another schematic diagram of a collection loop according to an exemplary embodiment;

[0040] Figure 6 is another schematic diagram of a collection loop according to an exemplary embodiment;

[0041] Figure 7 is another schematic diagram of a collection loop according to an exemplary embodiment;

[0042] Figure 8 is a flow chart of a state control method according to an exemplary embodiment;

[0043] Fig. 9 is a schematic diagram of a state control process according to an exemplary embodiment;

[0044] Fig.10 is a block diagram of a state control device according to an exemplary embodiment;

[0045] Fig.11 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0046] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0048] In the embodiments of the present application, words such as "exemplary", "for example", or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary", "for example", or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example", or "for example" is intended to present related concepts in a specific way.

[0049] First, some of the terms and related technologies involved in this application are explained to facilitate understanding by those skilled in the art.

[0050] The vigorous development of the new energy vehicle industry is not only reflected in the rapid expansion of the market size, but also in the significant improvement of technological innovation capabilities. This trend is gradually changing the landscape of the global automotive industry. As consumers' requirements for the performance of new energy vehicles are increasing, especially their expectations for driving range and safety performance, new energy vehicle manufacturers are facing unprecedented challenges and opportunities.

[0051] As the heart of new energy vehicles, the performance of batteries is directly related to the vehicle's endurance and safety. Therefore, the design and fault detection of battery high-voltage systems have become the focus of technology research and development. While pursuing product cost optimization, how to ensure the diverse functionality and safety of the battery system is a question that every new energy vehicle manufacturer needs to think deeply about.

[0052] The hardware design of BMS plays a vital role in the realization of battery safety functions. By designing that the total voltage and insulation acquisition share the same circuit, the total voltage acquisition and insulation functions can be realized while ensuring the product cost. However, this design also brings problems such as unbalanced insulation acquisition and false pressure on the high-voltage port. In order to solve these problems, reasonably controlling the acquisition circuit switch and avoiding acquisition circuit interference have become the key to technical optimization.

[0053] The "GBT 31498-2015 Electric Vehicle Post-Collision Safety Requirements" stipulates that the battery safety protection against electric shock must meet the low voltage requirements, and at least one of the three clauses of physical protection, electric energy, and insulation resistance must be met. Among them, the low voltage requirement is a necessary condition for a five-star collision. The "GBT 31498-2015 Electric Vehicle Post-Collision Safety Requirements" points out that 5s to 60s after the end of the C-NCAP electric vehicle collision test, the positive and negative voltages U1 of the high-voltage bus, the positive voltage to ground U2, and the negative voltage to ground U3 shall not be higher than 60V. However, in the current hardware design, the negative voltage to ground is connected to the multimeter detection circuit in parallel due to the internal hardware of the BMS, that is, the multimeter detection voltage is the voltage of the internal detection resistor of the BMS, resulting in a 100V virtual voltage in the positive voltage to ground U2 under the low voltage state, which does not meet the "GBT 31498-2015 Electric Vehicle Post-Collision Safety Requirements".

[0054] Based on the strict requirements of electric vehicle collision test and battery safety test, optimizing the insulation acquisition strategy is particularly important for the battery system in the high-voltage system. The current related technologies mainly realize accurate monitoring of insulation resistance by redesigning the hardware, however, there are related technologies in software control of hardware acquisition strategy.

[0055] There are two major problems with the current related technologies: excessive emphasis on optimizing the acquisition circuit through hardware design, which often leads to a significant increase in costs; and patents based on the principle of the balanced bridge method often fail to fully consider the problems that the battery may encounter in actual working scenarios, such as unbalanced insulation in the acquisition circuit (causing acquisition voltage fluctuations) and virtual voltage at the output port under low-voltage conditions.

[0056] These problems are closely related to the hardware design of the BMS (battery management system) motherboard, especially the interference between internal acquisition channels. Traditional solutions usually cut off the connection with the BMS acquisition circuit by adding high-voltage relays, but this is costly.

[0057] like Figure 1 As shown, Figure 1 This is the BMS voltage acquisition control strategy architecture diagram.

[0058] Figure 1 The equivalent insulation resistance Rp in the figure can be used to characterize the equivalent insulation resistance between the positive pole of the main circuit and the ground, the equivalent Y capacitance Cp can be used to characterize the equivalent Y capacitance between the positive pole of the main circuit and the ground, the equivalent insulation resistance Rn can be used to characterize the equivalent insulation resistance between the negative pole of the main circuit and the ground, and the equivalent Y capacitance Cn can be used to characterize the equivalent Y capacitance between the main negative pole and the ground. Among them, the equivalent insulation resistance between the negative pole of the main circuit and the ground is less than the equivalent insulation resistance between the positive pole of the main circuit and the ground, that is, the equivalent insulation resistance Rn is greater than the equivalent insulation resistance Rp.

[0059] Figure 1 The voltage U1 in the figure can be used to characterize the voltage at point A when the resistor R1 is not connected, and the voltage U2 can be used to characterize the voltage at point B when the resistor R1 is not connected. The voltage U1′ can be used to characterize the voltage at point A when the resistor R3 is not connected, and the voltage U2′ can be used to characterize the voltage at point B when the resistor R3 is not connected.

[0060] In one possible implementation, according to the national standard, the equivalent insulation resistance Rn between the negative pole of the main circuit and the ground satisfies the following first formula:

[0061] Rn=R3*((U2' / U2)(U1' / U1))First formula

[0062] Among them, Rn can be used to characterize the equivalent insulation resistance between the negative pole of the main circuit and the ground. R3 can be used to characterize the resistance. Voltage U1 can be used to characterize the voltage at point A when the resistor R1 is not connected, and voltage U2 can be used to characterize the voltage at point B when the resistor R1 is not connected. Voltage U1′ can be used to characterize the voltage at point A when the resistor R3 is not connected, and voltage U2′ can be used to characterize the voltage at point B when the resistor R3 is not connected.

[0063] It should be noted that the calculation of the equivalent insulation resistance Rn requires stable voltages at points A and B. The present application can collect voltages and determine the average values ​​of the collected voltages for multiple times as voltage U1, voltage U2, voltage U1′, and voltage U2′.

[0064] like Figure 2 As shown, Figure 2 This is a schematic diagram of the internal data collection loop architecture of a BMS.

[0065] Figure 2 The relay S1 (i.e., the first relay), the relay S2, and the relay S3 (i.e., the second relay) may be included. The relay S1, the relay S2, and the relay S3 may be related to the high voltage power-on process of the power battery.

[0066] Figure 2 It includes output port 1 and output port 2. Figure 2 It also includes a first acquisition circuit PACK (used to acquire the total voltage inside the relay S1), a second acquisition circuit LINK (used to acquire the total voltage outside the relay S2, that is, the total voltage outside the relay S1), and a third acquisition circuit CHNG (used to acquire the total voltage outside the relay S3, that is, another total voltage outside the relay S1).

[0067] like Figure 3 As shown, Figure 3 This is a hardware architecture diagram of a BMS, that is, Figure 2 The internal acquisition circuit.

[0068] Figure 3 The detection resistor R4, the detection resistor R5, the detection resistor R6, the detection resistor R7, the acquisition voltage divider resistor R8 and the acquisition voltage divider resistor R9 are included. Figure 1 The resistor R1 in the sample corresponds to the voltage divider resistor R9. Figure 1 The resistor R2 in the figure corresponds to Rp1. Rp1 can be used to characterize the equivalent insulation resistance of the output port one main positive to the low voltage ground, and Rn1 can be used to characterize the equivalent insulation resistance of the output port one main negative to the low voltage ground. Switches K1, K2, K3, and K4 can be insulation acquisition circuit switches, respectively. Figure 2 The optocoupler switches of the first acquisition loop are switch K1 and switch K2, the optocoupler switches of the first acquisition loop are switch K3 and switch K2, and the optocoupler switches of the first acquisition loop are switch K3 and switch K4.

[0069] When the battery is in high-voltage discharge state, S1 is closed and S3 is open. Figure 3 As shown, the voltage-dividing resistors R8 and R9 are connected in parallel outside the detection resistors R4 and R5, and at this time, the detection resistors R6 and R7 are connected in parallel in the third acquisition loop CHNG.

[0070] Combination Figure 3 The balanced bridge method can be used to control the switch K1 to be closed and record the voltage U1 and voltage U2 when the switch K1 is closed, and to control the switch K1 to be opened and record the voltage U1′ and voltage U2′ when the switch K1 is opened, so as to further determine the insulation resistance of the main negative terminal to the ground according to the first formula.

[0071] Therefore, the balanced bridge method is used to accurately calculate the insulation resistance, which requires stable voltages U1, U2, U1′, and U2′. In actual working conditions, the time it takes for voltages U1, U2, U1′, and U2′ to reach a stable state will change in real time according to the load environment, and it is necessary to determine in real time whether voltages U1, U2, U1′, and U2′ have reached a stable state.

[0072] The problem of insulation acquisition failure caused by insulation imbalance is rooted in the failure to fully consider the mutual influence between acquisition channel loops during insulation acquisition. Specifically, when the first acquisition loop and the third acquisition loop are activated, that is, when switches K1, K3, and K4 are in a closed state, the insulation detection loop will connect the detection resistor R7 in parallel to the loop. At this time, the loop where R7 is located is connected to the output port 2, and the related wiring harness is in a suspended state.

[0073] In this case, if the external insulation is abnormal or an external resistor is connected, the collected voltages U1 and U2 will continue to fluctuate. Since the basic principle of insulation detection requires that the collected voltages U1 and U2 need to remain stable, this abnormal voltage fluctuation will occasionally lead to the inability to obtain the calculation results, thereby making the insulation detection function invalid.

[0074] Based on this, the problem of insulation acquisition failure stems from the failure to properly handle the mutual influence between the acquisition channel loops during the acquisition process, as well as the voltage fluctuations caused by external insulation abnormalities or resistance access.

[0075] To ensure the normal realization of the insulation function, the first task is to effectively avoid the mutual interference between the first acquisition circuit PACK and the third acquisition circuit CHNG. Therefore, it is necessary to deeply understand and identify the specific role of the battery acquisition circuit in different work processes, and accurately control the closing and opening timing of the acquisition channel switch. Through such meticulous operation, the mutual interference between the insulation acquisition circuits can be significantly reduced.

[0076] However, when relay S1 is closed and relay S3 is open, the battery system is in a high-voltage discharge state. In this state, if the main circuit maintains high voltage and the third acquisition circuit switch on the DC side is turned on, it may cause a sharp fluctuation in voltage, which will cause serious interference to the insulation acquisition process.

[0077] In particular, the switching of the switch in the third acquisition loop will directly affect the stability of the voltage U2, resulting in the inability to accurately perform insulation detection.

[0078] Therefore, in order to ensure the reliability and accuracy of the insulation function and to effectively avoid the adverse effects of switching of switches such as the third acquisition loop on insulation acquisition during high-voltage discharge of the battery, precise control of the switching timing of the switches and in-depth analysis and effective isolation of mutual interference between acquisition channels are required.

[0079] Combination Figure 3 , when the battery is in a high-voltage power-on state and relay S1 remains in a closed state for a preset time (i.e., the time required for relay S3 normally closed fault diagnosis), the application layer of the BMS will send a flag to the bottom layer for shutting down the total voltage on the DC side. After receiving the flag to shut down the total voltage on the DC side, the bottom layer will disconnect switch K4 of the third acquisition channel. This effectively solves the problem of insulation detection failure that may occur in batteries under high-voltage conditions.

[0080] In addition, according to the provisions of the anti-electric shock protection in the electric vehicle collision test, it is required that the high-voltage power supply of the battery be cut off immediately when the vehicle encounters a collision accident during normal driving. Specifically, within 5 to 60 seconds after the collision, the voltage U1 between the positive and negative poles, the voltage U2 between the positive pole and the ground, and the voltage U3 between the negative pole and the ground of the high-voltage output port 1 and output port 2 of the battery must all drop below 60V to ensure compliance with the low-voltage safety standard.

[0081] Combination Figure 3 ,like Figure 4 As shown, Figure 4 A schematic diagram of a collection circuit is shown in FIG. Figure 4 is based on Figure 3 Schematic diagram of total voltage acquisition and BMS hardware acquisition circuit in low voltage state.

[0082] Figure 4 The resistor R10 is used to represent the universal standard detection resistor. The resistor R10 is connected to the positive terminal of the output port and the ground. The arrow can be used to indicate the flow direction of the internal current of the battery under low voltage conditions. When a closed loop is formed, the voltage shared by the resistor 10 can be obtained through a multimeter. When the switch K1 is closed, or K1 and K2 are closed at the same time, the circuit will include R4, R8 and R10. Based on the voltage division principle, it can be determined that the voltage between the main positive pole and the ground does not meet the requirements of the collision test.

[0083] When switch K1 is disconnected, the acquisition circuit inside the BMS will be in a disconnected state. At this time, the multimeter will directly collect the voltage on both sides of the positive and negative electrodes of the battery. However, since the high-voltage circuit is already in an open circuit state, the voltage detected at this time meets the requirements of the collision test.

[0084] Combination Figure 3 ,like Figure 5 As shown, Figure 5This is another schematic diagram of a collection circuit, that is, a schematic diagram of the principle of a multimeter collecting voltage from an output port to a main negative to ground. Under low voltage conditions, the voltage between an output port and a main positive to ground can be measured.

[0085] Figure 5 The resistor R11 is used to represent the universal standard detection resistor. The arrow can be used to indicate the flow direction of the internal current of the battery under low voltage state. When the switch K1 and the switch K2 are both in the closed state, the acquisition circuit includes resistors R4, R5, R9 and R11. Based on the voltage division principle, the voltage between the main positive and the ground measured at this time does not meet the safety requirements of the collision test.

[0086] When the voltage acquisition switch K1 is disconnected, the acquisition circuit inside the BMS will be disconnected. Similarly, by disconnecting the switch K1, it can be ensured that the BMS meets the safety requirements of the collision test.

[0087] Combination Figure 3 ,like Figure 6 As shown, Figure 6 This is another collection circuit diagram, that is, a total collection circuit diagram based on a low voltage state, which is used to collect the voltage between the two negative output ports and the ground in a low voltage state.

[0088] Figure 6 The resistor R12 is used to represent the universal standard detection resistor. The resistor R12 is connected to the negative end of the output port and the ground. When the switch K1 is closed or the switches K1 and K4 are closed at the same time, there are resistors R4, R8, R12, and R6 in the loop. At this time, according to the current flow, the BMS does not meet the collision test requirements.

[0089] Combination Figure 3 ,like Figure 7 As shown, Figure 7 This is another schematic diagram of a collection circuit, that is, a schematic diagram of the principle of collecting voltage with a multimeter at output port 2, main negative to ground.

[0090] Figure 7 The resistor R13 in the figure is used to represent the universal standard detection resistor, and the arrow is used to indicate the current direction during actual measurement. When only switch K1 is closed in the acquisition circuit, the voltage cannot be detected. When switches K1, K4, and K5 are closed at the same time, the resistors in the acquisition circuit include resistors R4, R13, and R8. According to the voltage division principle, the detected voltage value does not meet the collision requirements at this time.

[0091] In order to improve the problems existing in the above-mentioned technology, an embodiment of the present application provides a state control method, which is applied to a vehicle. The vehicle includes a battery management system BMS acquisition circuit. The BMS acquisition circuit has multiple acquisition circuits. The acquisition circuit is used to detect the insulation state of the BMS. When the power battery of the vehicle is powered on at high voltage, the vehicle state and the first voltage can be obtained, wherein the first voltage is the voltage of the corresponding acquisition circuit, so as to further control the state of the BMS acquisition circuit and the state of the power battery based on the first voltage and the vehicle state, that is, to control the switches in the BMS acquisition circuit and the discharge of the battery, so as to avoid the problems of insulation detection failure and virtual voltage, ensure vehicle safety, and make the vehicle's BMS meet the safety requirements of electric vehicles after a collision.

[0092] For ease of understanding, the state control method provided by the present application is specifically introduced below with reference to the accompanying drawings.

[0093] In one embodiment, if Figure 8 As shown, when the power battery is in a high-voltage power-on state, the state control method provided in the present application includes the following steps: S801-S802.

[0094] S801. When a power battery of a vehicle is powered on at high voltage, obtain a vehicle state and a first voltage.

[0095] The first voltage includes the voltage corresponding to each acquisition circuit. The vehicle state may include a normal state and a collision state.

[0096] It should be noted that the acquisition circuit includes a first acquisition circuit, a second acquisition circuit and a third acquisition circuit. The first acquisition circuit is the acquisition circuit inside the first relay (relay S1). The second acquisition circuit is the acquisition circuit outside the first relay. The third acquisition circuit is the voltage outside the second relay (relay S3).

[0097] In a possible implementation manner, the state control device may obtain the voltage of the first acquisition loop, the voltage of the second acquisition loop, and the voltage of the third acquisition loop.

[0098] S802: Based on the first voltage and / or the vehicle state, control the state of the BMS acquisition circuit and / or the state of the power battery.

[0099] In one possible implementation, before controlling the state of the BMS acquisition circuit and / or the state of the power battery based on the first voltage and / or the vehicle state, the state control device may determine whether the target acquisition circuit meets the normal opening and closing conditions of the relay based on the voltage corresponding to the target acquisition circuit included in the first voltage. The state control device may control the target acquisition circuit to disconnect when the normal opening and closing conditions of the relay are met, and execute the steps of controlling the state of the BMS acquisition circuit and / or the state of the power battery. The normal opening and closing conditions of the relay represent the conditions for disconnection or closing that the relay in the BMS acquisition circuit normally meets when the power battery is in a high-voltage power-on state.

[0100] It should be noted that the state control device can determine whether the voltage corresponding to the third acquisition circuit is less than the first voltage threshold. If the voltage corresponding to the third acquisition circuit is less than the first voltage threshold, the state control device can determine that the target acquisition circuit meets the normal opening and closing conditions of the relay.

[0101] Optionally, the first voltage threshold may be set according to actual needs. For example, the first voltage threshold may be 10 V or 8 V. This application does not impose any specific restrictions on this.

[0102] Specifically, the state control device can obtain the voltage of the third acquisition channel, that is, the voltage outside the relay S3 (CHRG+, CHRG-), detect the closed state of the relay S3, and control the disconnection of the switch of the third acquisition loop. The state control device can determine that the second relay is in the disconnected state, that is, the relay S3 is in the disconnected state, for the first voltage corresponding to the third acquisition loop, that is, the voltage outside the relay S1, if the first voltage is less than the first voltage threshold. The state control device can disconnect the third acquisition loop, that is, close the switch of the third acquisition loop, when the second relay is in the disconnected state.

[0103] In another possible manner, if the BMS acquisition circuit does not meet the normal opening and closing conditions of the relay, the state control device may determine that there is a fault in the BMS acquisition circuit and power off the power battery.

[0104] Specifically, if the BMS acquisition circuit does not meet the normal opening and closing conditions of the relay, the state control device can determine that the second relay is in a closed state. When the second relay is in a closed state, the state control device can determine that there is a fault in the BMS acquisition circuit and power off the power battery.

[0105] In another possible implementation, the state control device may determine whether the acquisition circuit meets the normal conditions for high-voltage discharge based on the first voltage and / or the vehicle state. The state control device may adjust the closed state of the first acquisition circuit and the second acquisition circuit based on a preset period when the normal conditions for high-voltage discharge are met. The state control device may disconnect the BMS acquisition circuit and power off the power battery when the normal conditions for high-voltage discharge are not met. Disconnecting the BMS acquisition circuit includes disconnecting the first relay, and disconnecting the first acquisition circuit and the second acquisition circuit.

[0106] Specifically, the power battery can be discharged after disconnecting the third acquisition circuit. The state control device can adjust the closed state of the first acquisition circuit (the acquisition circuit inside the relay S1) and the second acquisition circuit (the acquisition circuit outside the relay S1) based on a preset cycle when the power battery is discharged and the vehicle is in a normal state. In addition, the state control device can receive a signal sent by the vehicle, for example, after receiving the power-off signal of the vehicle, the power battery and the entire vehicle are powered off.

[0107] When a vehicle collides, the collision detection device of the vehicle may send a collision signal to the state control device. After receiving the collision signal, the state control device determines that the vehicle is not in a normal state. Alternatively, when the vehicle is in a wading state, the state control device may determine that the vehicle is not in a normal state. When the vehicle is not in a normal state or the first voltage is greater than the third voltage threshold, the state control device may adjust the first relay (relay S1) to a disconnected state and disconnect the first acquisition circuit and the second acquisition circuit to ensure the safety of vehicle personnel and collision test requirements.

[0108] Optionally, the second voltage threshold may be set according to actual needs. For example, the second voltage threshold may be 60 V or 50 V. This application does not impose any specific restrictions on this.

[0109] Based on this, the present application can obtain the vehicle status and the first voltage when the vehicle's power battery is powered on at high voltage, wherein the first voltage is the voltage of the corresponding acquisition circuit, so as to further control the status of the BMS acquisition circuit and the status of the power battery based on the first voltage and the vehicle status, that is, to control the switches in the BMS acquisition circuit and the discharge of the battery, to avoid insulation detection failure and virtual voltage problems, to ensure vehicle safety, and to enable the vehicle's BMS to meet the safety requirements of electric vehicles after a collision.

[0110] In another embodiment, before the power battery is in a high-voltage power-on state, the present application can determine the voltage of the acquisition circuit, perform a self-check when the power battery is powered on, and determine whether a normally closed fault occurs at the mechanical end of relay S3 to avoid damage to the relay.

[0111] Specifically, combined Figure 3 The state control device can wake up the BMS according to the instructions of the vehicle communication system and complete the initialization operation of the main board and the sub-board. The state control device can turn on the voltage acquisition module, the temperature acquisition module and the CAN communication module. The state control device can check each module to ensure its normal operation.

[0112] The state control device can control the voltage acquisition process according to the battery status information fed back by the BMS. After the initialization is completed, the state control device can set the loop acquisition flag bits of the first acquisition loop (PACK), the second acquisition loop (LINK), and the third acquisition loop (CHNG) to a closed state. After receiving these flag bits, the BMS closes the voltage acquisition switches of the first acquisition loop, the second acquisition loop, and the third acquisition loop. At the same time, the state control device can monitor the switch status of switches K1, K2, and K3 in real time, and use the voltage values ​​collected in real time to determine whether the process is proceeding normally.

[0113] The state control device can determine the closure status of the first acquisition loop, the second acquisition loop, and the third acquisition loop based on the collected voltage value, that is, the state control device can collect the voltage inside the relay S1 and determine whether it is greater than the third voltage threshold. If the voltage inside S1 is greater than the third voltage threshold, it indicates that the acquisition channel is closed normally and the next process can be entered. If the voltage inside S1 is less than the third voltage threshold, it indicates that the acquisition loop switch has a closed abnormality and the fault power-off process needs to be executed.

[0114] Optionally, the third voltage threshold may be set according to actual needs. For example, the third voltage threshold may be 100 V or 120 V. This application does not impose any specific restrictions on this.

[0115] The state control device can close the switch relay S2 when the battery receives the pre-charge instruction fed back by the vehicle (i.e., replenishing energy to the external load). The state control device can collect the voltage outside the relay S2 in real time, and judge the closing status of the relay S2 according to the change of the voltage outside the S2. If the voltage continues to increase over time, it indicates that the second acquisition loop is closed normally and effective, and the voltage outside the relay S1 is fed back in real time.

[0116] Furthermore, if the voltage outside S2 is greater than the preset ratio of the total battery voltage, the relay S1 is closed to power up the power battery with high voltage. If the real-time collected voltage outside S2 is less than the fourth voltage threshold or is less than the preset ratio of the total battery voltage after a certain period of time, it indicates that there is an abnormality in the circuit and the fault power-off process needs to be executed.

[0117] Optionally, the preset ratio can be set according to actual needs. For example, the preset ratio can be 95% or 90%. This application does not impose any specific restrictions on this.

[0118] Optionally, the fourth voltage threshold may be set according to actual needs. For example, the fourth voltage threshold may be 10V or 5V. This application does not impose any specific restrictions on this.

[0119] At the same time, the bottom layer also needs to collect the voltage outside the relay S3 and determine whether it is continuously less than the fourth voltage threshold. If the voltage outside the relay S3 is less than the fourth voltage threshold, it indicates that the acquisition channel is closed normally and the next process can be entered. Otherwise, it indicates that the self-test fails and the power-off process needs to be executed.

[0120] Based on this, the present application can perform a self-check before the power battery is powered on to determine whether the current battery condition allows safe high-voltage power-on, thereby avoiding the dangers that may be caused by direct high-voltage power-on.

[0121] In one embodiment, if Fig. 9 As shown, it is a schematic diagram of a state control process provided by this application.

[0122] The state control device can initialize the BMS acquisition circuit. After completing the initialization of the BMS acquisition circuit, the state control device can set the loop acquisition flags of the first acquisition circuit, the second acquisition circuit, and the third acquisition circuit to a closed state. The state control device can determine whether the voltage of the first acquisition circuit, the voltage of the second acquisition circuit, and the voltage of the third acquisition circuit meet the preset conditions, otherwise, the loop acquisition flags of the first acquisition circuit, the second acquisition circuit, and the third acquisition circuit are set to a closed state again.

[0123] The preset conditions include whether the voltage of the first acquisition loop is greater than a third voltage threshold, whether the voltage of the second acquisition loop is less than a fourth voltage threshold, and whether the voltage of the third acquisition loop is less than the fourth voltage threshold.

[0124] The state control device can determine that the first acquisition circuit, the second acquisition circuit, and the third acquisition circuit are in a closed state when the preset conditions are met. The state control device can determine whether the voltage of the second acquisition channel is greater than the preset ratio of the fifth voltage threshold when the first acquisition circuit, the second acquisition circuit, and the third acquisition circuit are determined to be in a closed state. The state control device can power on the power battery with high voltage when the voltage of the second acquisition channel is greater than the preset ratio of the fifth voltage threshold, otherwise, it is determined that the pre-charging has failed and the power battery is powered off due to a fault.

[0125] When the power battery is in a high-voltage power-on state, the state control device can determine whether the voltage of the third acquisition channel is less than the first voltage threshold. When the voltage of the third acquisition channel is less than the first voltage threshold, the state control device can send a discharge mark to the power battery to perform normal high-voltage discharge through the power battery. The state control device can determine whether the vehicle is in a collision state. When the vehicle is in a collision state, the state control device can disconnect the relay S3 and disconnect the first acquisition circuit and the second acquisition circuit to further power off the power battery in case of a fault.

[0126] When the voltage of the third acquisition channel is not less than the first voltage threshold, the state control device can determine that the relay S3 is abnormal and perform fault power-off on the power battery.

[0127] The state control device can be in a normal state of the vehicle, and after receiving a power-off instruction, perform normal power-off.

[0128] Fig.10 is a block diagram of a state control device according to an exemplary embodiment. Fig.10 The state control device includes: an acquisition unit 1001, a control unit 1002 and a judgment unit 1003.

[0129] In a possible manner, the acquisition unit 1001 is used to acquire the vehicle state and the first voltage when the power battery of the vehicle is powered on at high voltage.

[0130] In one possible manner, the control unit 1002 is used to control the state of the BMS acquisition circuit and / or the state of the power battery based on the first voltage and / or the vehicle state.

[0131] In a possible manner, the judging unit 1003 is configured to judge whether the target acquisition circuit meets the normal opening and closing condition of the relay based on the voltage corresponding to the target acquisition circuit included in the first voltage.

[0132] In one possible manner, the control unit 1002 is further used to control the target acquisition circuit to be disconnected when the normal opening and closing conditions of the relay are met, and to execute the steps of controlling the state of the BMS acquisition circuit and / or the state of the power battery.

[0133] In one possible manner, the judgment unit 1003 is specifically used to: judge whether the voltage corresponding to the third acquisition circuit is less than the first voltage threshold; if the voltage corresponding to the third acquisition circuit is less than the first voltage threshold, determine that the target acquisition circuit meets the normal opening and closing conditions of the relay.

[0134] In a possible manner, the judgment unit 1003 is specifically used to: if the BMS acquisition circuit does not meet the normal opening and closing conditions of the relay, determine that there is a fault in the BMS acquisition circuit, and power off the power battery.

[0135] In a possible manner, the judgment unit 1003 is further configured to judge whether the acquisition circuit meets the normal high-voltage discharge condition based on the first voltage and / or the vehicle state.

[0136] In a possible manner, the control unit 1002 is further configured to adjust the closed state of the first acquisition loop and the second acquisition loop based on a preset cycle when the normal high-voltage discharge condition is met.

[0137] In one possible manner, the control unit 1002 is further configured to disconnect the BMS acquisition circuit and power off the power battery when normal high-voltage discharge conditions are not met.

[0138] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0139] Fig.11 FIG. 1 is a block diagram of an electronic device according to an exemplary embodiment. Fig.11 As shown, the electronic device includes but is not limited to: a processor 1101 and a memory 1102 .

[0140] The memory 1102 is used to store executable instructions of the processor 1101. It can be understood that the processor 1101 is configured to execute instructions to implement the state control method in the above embodiment.

[0141] It should be noted that those skilled in the art can understand that Fig.11 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and the electronic device may include Fig.11 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0142] The processor 1101 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 1102, and calling data stored in the memory 1102, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. The processor 1101 may include one or more processing units. Optionally, the processor 1101 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 1101.

[0143] The memory 1102 may be used to store software programs and various data. The memory 1102 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one functional module (such as a determination unit, a processing unit, etc.), etc. In addition, the memory 1102 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0144] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 1102 including instructions. The above instructions can be executed by a processor 1101 of an electronic device to implement the method in the above embodiment.

[0145] In actual implementation, Fig.10 The functions of the acquisition unit 1001, the control unit 1002 and the judgment unit 1003 can all be obtained by Fig.11 The processor 1101 in the embodiment calls the computer program stored in the memory 1102 to implement. The specific execution process can refer to the description of the method part in the above embodiment, which will not be repeated here.

[0146] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0147] In an exemplary embodiment, the present application also provides a computer program product including one or more instructions, and the one or more instructions can be executed by the processor 1101 of the electronic device to complete the method in the above embodiment.

[0148] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the processor of the electronic device, the various processes of the above-mentioned method embodiment are implemented, and the same technical effect as the above-mentioned method can be achieved. To avoid repetition, they will not be repeated here.

[0149] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0150] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0151] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0152] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0153] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the full classification part or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including a number of instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute the full classification part or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, ROM, RAM, disk or CD and other media that can store program code.

[0154] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions 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 state control method, characterized in that: Applied to a vehicle, the vehicle includes a battery management system BMS acquisition circuit, the BMS acquisition circuit has multiple acquisition loops, the acquisition loop is used to detect the insulation state and voltage state of the BMS, the method includes: When the power battery of the vehicle is powered on at high voltage, obtaining a vehicle state and a first voltage; the first voltage includes voltages corresponding to each of the acquisition circuits; Based on the first voltage and / or the vehicle state, the state of the BMS acquisition circuit and / or the state of the power battery is controlled.

2. The method according to claim 1, characterized in that The vehicle state includes a normal state and a collision state.

3. The method according to claim 2, characterized in that Before controlling the state of the BMS acquisition circuit and / or the state of the power battery based on the first voltage and / or the vehicle state, the method further includes: Based on the voltage corresponding to the target acquisition circuit included in the first voltage, it is judged whether the target acquisition circuit meets the normal opening and closing condition of the relay; the normal opening and closing condition of the relay represents the disconnection or closing condition that the relay in the BMS acquisition circuit normally meets when the power battery is in a high-voltage power-on state; When the normal opening and closing conditions of the relay are met, the target acquisition circuit is controlled to be disconnected, and the step of controlling the state of the BMS acquisition circuit and / or the state of the power battery is performed.

4. The method according to claim 3, characterized in that The acquisition circuit includes a first acquisition circuit, a second acquisition circuit and a third acquisition circuit; the first acquisition circuit is the acquisition circuit inside the first relay in the BMS acquisition circuit; the second acquisition circuit is the acquisition circuit outside the first relay; the third acquisition circuit is the voltage outside the second relay in the BMS acquisition circuit; the target acquisition circuit is the third acquisition circuit; The determining whether the target acquisition circuit meets the normal opening and closing conditions of the relay based on the voltage corresponding to the target acquisition circuit included in the first voltage includes: It is determined whether the voltage corresponding to the third acquisition circuit is less than the first voltage threshold. If the voltage corresponding to the third acquisition circuit is less than the first voltage threshold, it is determined that the target acquisition circuit meets the normal opening and closing conditions of the relay.

5. The method according to claim 4, characterized in that The method further comprises: If the target acquisition circuit does not meet the normal opening and closing conditions of the relay, it is determined that the BMS acquisition circuit has a fault and the power battery is powered off.

6. The method according to claim 4 or 5, characterized in that: The controlling the state of the BMS acquisition circuit and / or the state of the power battery based on the first voltage and / or the vehicle state includes: Based on the first voltage and / or the vehicle state, determining whether the acquisition circuit meets normal high-voltage discharge conditions; When the normal high-voltage discharge condition is met, the closed state of the first acquisition loop and the second acquisition loop is adjusted based on a preset period.

7. The method according to claim 6, characterized in that The method further comprises: When the normal condition for high-voltage discharge is not met, the BMS acquisition circuit is disconnected, and the power battery is powered off; disconnecting the BMS acquisition circuit includes disconnecting the first relay, and disconnecting the first acquisition circuit and the second acquisition circuit.

8. The method according to claim 7, characterized in that The normal conditions for high-voltage discharge include: The vehicle is in a normal state, and the voltage of the first acquisition channel or the voltage of the second acquisition circuit is not greater than a second voltage threshold.

9. A state control device, characterized in that: The device comprises: an acquisition unit and a control unit; The acquisition unit is used to acquire the vehicle state and the first voltage when the power battery of the vehicle is powered on at high voltage; the first voltage includes the voltage corresponding to each acquisition circuit; The control unit is used to control the state of the BMS acquisition circuit and / or the state of the power battery based on the first voltage and / or the vehicle state.

10. A state control system, characterized in that: include: State control device and BMS acquisition circuit; The state control device is used to obtain the vehicle state and the first voltage in the BMS acquisition circuit when the power battery of the vehicle is powered on at high voltage; the first voltage is the voltage of the corresponding acquisition circuit; The state control device is further used to control the state of the BMS acquisition circuit and the state of the power battery based on the first voltage and the vehicle state.

11. A vehicle, characterized in that: Includes the state control system as claimed in claim 10.

12. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method according to any one of claims 1 to 8.

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