Battery system capable of being separated from vehicle body, control method of battery system and new energy vehicle

Abstract

The invention discloses a battery system capable of being separated from a vehicle body, a control method of the battery system and a new energy vehicle, the battery system comprises a high-voltage battery module, a low-voltage battery module, a DCDC module, an unlocking mechanism, a driving module and a BMS system, the DCDC module is electrically connected with the low-voltage battery module and the high-voltage battery module, the low-voltage battery module is electrically connected with the unlocking mechanism, and the driving module is electrically connected with the BMS system. The high-voltage battery module is electrically connected with the driving module, and the BMS system is electrically connected with the low-voltage battery module, the DCDC module, the unlocking mechanism, the driving module and the high-voltage battery module. When dangerous situations such as battery thermal runaway occur, the low-voltage battery can cut off connection between a high-voltage battery power source and a vehicle body through the unlocking mechanism, meanwhile, electric power is provided for separation of the high-voltage battery, the risk of heat spreading is greatly reduced, the safety of the vehicle and personnel is guaranteed, in addition, the low-voltage battery can further provide electric power for the driving module, and the safety of the vehicle is improved. And the vehicle keeps power after the high-voltage battery is cut off, so that the risk is further reduced.

Description

Technical Field

[0001] The present invention relates to the field of new energy batteries, and in particular to a new energy vehicle comprising a battery system that can be detached from a vehicle body. Background Art

[0002] In the event of an emergency, the battery pack of a new energy vehicle usually uses a release mechanism to disengage the high-voltage battery module to prevent the high-voltage battery from causing danger to the vehicle itself and personnel.

[0003] The existing technical solutions focus more on how to achieve the unlocking of the battery pack. However, the unlocking power of the power battery in the existing technical solutions comes from the power battery itself. When thermal runaway occurs, the probability of battery failure is very high and it is impossible to provide power for the towing lock mechanism. The risk of disengaging to complete the escape action is high. After the out-of-control battery is disengaged, the vehicle cannot move further away from the out-of-control battery except for inertia, and there is still a certain risk. Summary of the invention

[0004] The purpose of the present invention is to solve the defects in the prior art that there is no operation after unlocking the high-voltage battery unit and the power of the unlocked high-voltage battery comes from the high-voltage battery itself, which is prone to failure. A battery system that can be detached from the vehicle body and its control method and new energy vehicle are provided to achieve the detachment of the out-of-control high-voltage battery through the low-voltage battery, avoid the failure of the high-voltage battery when it is detached, and enable the new energy vehicle to travel a certain distance after detaching the high-voltage battery, thereby staying away from the detached high-voltage battery pack.

[0005] The present application proposes a battery system that can be separated from the vehicle body, which is used in a new energy vehicle including a drive module, including:

[0006] A high-voltage battery module, a low-voltage battery module, a DCDC module, a release mechanism and a BMS system, wherein the DCDC module is electrically connected to the low-voltage battery module and the high-voltage battery module respectively, the low-voltage battery module is electrically connected to the release mechanism, the high-voltage battery module is electrically connected to the drive module and supplies power to the drive module, and the BMS system is electrically connected to the low-voltage battery module, the DCDC module, the release mechanism, the drive module and the high-voltage battery module respectively;

[0007] The DCDC module is used to convert the high voltage current of the high voltage battery module of the new energy vehicle into a low voltage current suitable for charging the low voltage battery module and to convert the low voltage current of the low voltage battery module into a high voltage current to drive the driving module;

[0008] The unlocking mechanism is used to control the connection status of the high-voltage battery module with the new energy vehicle and the drive module according to the signal of the BMS system, and send the unlocking signal to the BMS system;

[0009] The BMS system is used to trigger the escape strategy according to the status of the high-voltage battery module. When the escape strategy is triggered, the high-voltage signal of the high-voltage battery module is cut off and the unlocking mechanism is controlled to disengage the high-voltage battery module. After obtaining the completed unlocking signal sent by the unlocking mechanism, the drive module is driven by the low-voltage battery module and the DCDC module to provide power for the vehicle.

[0010] Preferably, the high-voltage battery module includes a gas concentration sensor, a pressure sensor, a temperature sensor and a high-voltage battery;

[0011] The gas concentration sensor, pressure sensor and temperature sensor are used to collect status information of the high-voltage battery;

[0012] The BMS system collects information from gas concentration sensors, pressure sensors, and temperature sensors, and uses a pre-designed battery thermal runaway model to calculate the probability of thermal runaway in the high-voltage system. If the calculated probability is higher than the set escape threshold, the escape strategy is triggered.

[0013] Preferably, a high-voltage distribution box is further included, and the DCDC module is electrically connected to the drive module and the high-voltage battery module respectively through the high-voltage distribution box.

[0014] Preferably, the low-voltage battery module is electrically connected to the electronic suspension system and the on-board electronic appliances of the vehicle respectively;

[0015] The electronic suspension system and the on-board electronic appliances are electrically used to keep the new energy vehicle away from the high-voltage battery module.

[0016] Preferably, the method of driving the driving module to provide power through the low-voltage battery module and the DCDC module after obtaining the completed unlocking signal sent by the unlocking mechanism includes: after the BMS system obtains the completed unlocking signal sent by the unlocking mechanism, the DCDC module converts the low-voltage current of the battery system that can be separated from the vehicle body into high-voltage current, and controls the driving module to provide power through the high-voltage distribution box.

[0017] Preferably, the unlocking mechanism comprises:

[0018] The signal processing system is used to obtain signals from the vehicle and the BMS system, and to send the unlocking completion signal to the BMS system;

[0019] An electronic control switch for connecting and disconnecting the high-voltage battery module and the new energy vehicle according to the signal of the signal processing system;

[0020] The high-voltage system separation structure is used to connect and disconnect the high-voltage battery module according to the switching signal of the electronic control switch.

[0021] The present application proposes a control method for a battery system that can be detached from a vehicle body as described in the above embodiment, comprising the following steps:

[0022] The BMS system determines whether to trigger the escape strategy based on the status of the high-voltage battery module and sends a signal to the unlocking mechanism;

[0023] The unlocking mechanism controls the high-voltage battery module to be released from the vehicle according to the signal of the BMS system, and sends the unlocking completion signal to the BMS system;

[0024] The BMS system controls the low-voltage battery module to supply power to the drive module based on the unlocking completion signal.

[0025] Preferably, the BMS system determines whether to trigger the escape strategy according to the state of the high-voltage battery module, including:

[0026] The BMS system collects information from gas concentration sensors, pressure sensors, and temperature sensors, and uses a pre-designed battery thermal runaway model to calculate the probability of thermal runaway in the high-voltage system. If the calculated probability is higher than the set escape threshold, the escape strategy is triggered.

[0027] Preferably, the BMS system controls the low-voltage battery module to supply power to the drive module according to the unlocking completion signal, including: after the BMS system obtains the unlocking completion signal sent by the unlocking mechanism, the DCDC module converts the low voltage of the battery system that can be separated from the vehicle body into high voltage to supply power to the drive module.

[0028] The present application proposes a new energy vehicle, comprising a battery system that can be detached from the vehicle body as described in the above embodiment.

[0029] Beneficial effects: When dangerous situations such as battery thermal runaway occur, the low-voltage battery can cut off the connection between the high-voltage battery power supply and the vehicle body through the unlocking mechanism, while providing power for the high-voltage battery to be disengaged, greatly reducing the risk of heat spread and ensuring the safety of the vehicle and personnel;

[0030] In dangerous situations, the high-voltage battery module can be quickly disconnected and converted to high voltage through a battery system that can be detached from the vehicle body to drive the vehicle to limp. This not only ensures that the vehicle can quickly move away from the danger source in the event of thermal runaway, but also prevents the high-voltage battery pack from continuing to pose a threat to the vehicle. The system can effectively reduce the loss of the entire vehicle, prevent the high-voltage battery from further damaging other parts of the vehicle, and when driving the vehicle to move, it operates through high voltage, which avoids detachment failure compared to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Provide a method flow chart for the present invention;

[0032] Figure 2This is a schematic diagram of the structure of a high-voltage battery module of the present invention;

[0033] Figure 3 This is a schematic diagram of a new energy vehicle of the present invention;

[0034] Figure 4 It is a physical schematic diagram of the new energy vehicle of the present invention.

[0035] Reference numerals:

[0036] 1. Temperature and voltage sensor; 2. Pressure sensor; 3. Temperature sensor; 4. Unlocking mechanism; 5. BMS system; 6. Battery cell; 7. DCDC module; 8. High-voltage battery module; 9. Low-voltage battery module; 10. Drive module; 11. High-voltage distribution box; 12. Electronic suspension system; 13. On-board electronic appliances. DETAILED DESCRIPTION

[0037] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the specific embodiments of the accompanying drawings.

[0038] Example 1

[0039] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with general skills in the field to which the present invention belongs. "Including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0040] In view of the problems existing in the existing technology, such as Figure 1 , Figure 3 and Figure 4 As shown, a battery system that can be separated from the vehicle body is used for a new energy vehicle including a drive module 10, including:

[0041] A high-voltage battery module 8, a low-voltage battery module 9, a DCDC module 7, a release mechanism 4 and a BMS system 5, wherein the DCDC module 7 is electrically connected to the low-voltage battery module 9 and the high-voltage battery module 8 respectively, the low-voltage battery module 9 is electrically connected to the release mechanism 4, the high-voltage battery module 8 is electrically connected to the drive module 10 and supplies power to the drive module 10, and the BMS system 5 is electrically connected to the low-voltage battery module 9, the DCDC module 7, the release mechanism 4, the drive module 10 and the high-voltage battery module 8 respectively;

[0042] The DCDC module 7 is used to convert the high voltage current of the high voltage battery module 8 of the new energy vehicle into a low voltage current suitable for charging the low voltage battery module 9 and to convert the low voltage current of the low voltage battery module 9 into a high voltage current to drive the driving module 10;

[0043] The unlocking mechanism 4 is used to control the connection state between the high-voltage battery module 8 and the new energy vehicle and the drive module 10 according to the signal of the BMS system 5, and send the unlocking signal to the BMS system 5;

[0044] The BMS system 5 is used to trigger the escape strategy according to the status of the high-voltage battery module 8. When the escape strategy is triggered, the high-voltage signal of the high-voltage battery module 8 is cut off and the unlocking mechanism 4 is controlled to disengage the high-voltage battery module 8. After obtaining the completed unlocking signal sent by the unlocking mechanism 4, the drive module 10 is driven by the low-voltage battery module 9 and the DCDC module 7 to provide power for the vehicle.

[0045] Specifically, the low-voltage battery module 9 provides a low-voltage power supply for the vehicle, and the power is usually used for non-power systems in the vehicle, such as on-board electronic appliances 13, etc., and a 48V voltage system can be used in specific implementation;

[0046] DCDC module 7: This module has two functions:

[0047] Convert high voltage current into low voltage current: It converts the high voltage current of the high voltage battery module 8 of the new energy vehicle into a low voltage current suitable for charging the low voltage battery module 9, because the low voltage battery module 9 needs to supply power to the on-board electronic appliances 13, which generates losses;

[0048] Convert low-voltage current into high-voltage current: When necessary, it also converts the low-voltage current of the low-voltage battery module 9 into high-voltage current to drive the drive module 10 to output power, so that the new energy vehicle can continue to move forward when it is separated from the high-voltage battery module 8;

[0049] Unlocking mechanism 4: This mechanism is electrically connected to the low-voltage battery module 9 and functions to control the connection between the high-voltage battery module 8 and the body of the new energy vehicle. The unlocking mechanism can disconnect the high-voltage battery module 8 from the new energy vehicle under certain conditions (when a problem occurs in the high-voltage battery module 8), thereby playing a protective role;

[0050] High-voltage battery module 8: It is the core power source of the system. It is connected to the DCDC module 7 to provide its high voltage to the low-voltage battery module 9 for charging or to provide power for the drive module 10;

[0051] BMS system 5: The battery management system (Battery Management System) is used to monitor and manage the battery status. The BMS system 5 is not only responsible for managing the operation of the low-voltage battery module 9 and the DCDC module 7, but also can trigger the escape strategy. When the status of the high-voltage battery module 8 is abnormal, the BMS system 5 triggers the escape strategy, including cutting off the high-voltage signal of the high-voltage battery module 8 and controlling the unlocking mechanism 4 to cut off the connection between the high-voltage battery module 8 and the vehicle system to ensure safety;

[0052] Key workflows:

[0053] When the system is operating normally, the DCDC module 7 converts the high voltage of the high voltage battery module 8 into a low voltage suitable for charging the low voltage battery module 9;

[0054] Preferably, the low voltage range is 40V-60V; when the high-voltage battery module 8 is abnormal or the escape strategy needs to be triggered, the BMS system cuts off the high-voltage signal and triggers the unlocking mechanism 4 to disengage the high-voltage battery module 8 from the vehicle system, ensuring that the vehicle is away from the potential danger source high-voltage battery module 8;

[0055] The DCDC module 7 converts the low-voltage battery module 8 into a suitable high voltage, providing power to the vehicle in a short period of time and driving the vehicle to limp.

[0056] In some specific embodiments, Figure 2 , the high-voltage battery module 8 includes a gas concentration sensor, a pressure sensor 2, a temperature sensor 3 and a high-voltage battery;

[0057] The gas concentration sensor, pressure sensor 2 and temperature sensor 3 are used to collect status information of the high-voltage battery;

[0058] The BMS system 5 collects information from the gas concentration sensor, pressure sensor 2, and temperature sensor 3, and calculates the probability of thermal runaway of the high-voltage system through a pre-designed battery thermal runaway model. If the calculated probability is higher than the set escape threshold, the escape strategy is triggered.

[0059] Specifically, the gas concentration sensor (not shown in the figure) is used to detect whether there are harmful gases or abnormal gas concentrations inside the high-voltage battery module. Changes in these gases may indicate the risk of abnormal battery reactions or thermal runaway;

[0060] Pressure sensor 2: monitors changes in gas or battery fluid pressure within the high-voltage battery module. Drastic changes in pressure are usually associated with thermal runaway or battery failure, which may lead to explosion or other hazards.

[0061] Temperature sensor 3: detects temperature changes in the high-voltage battery module. When the battery temperature is too high, thermal runaway may occur, leading to battery damage, fire or explosion.

[0062] The BMS system calculates the probability of thermal runaway of the high-voltage system in real time based on the data fed back by the sensors and the pre-designed battery thermal runaway model. If the probability exceeds the set escape threshold (this threshold is set according to the system's safety standards), the BMS system will automatically trigger the escape strategy.

[0063] Once the escape strategy is triggered, the BMS system will cut off the high-voltage signal of the high-voltage battery module 8 and control the unlocking mechanism 4 to cut off the connection between the high-voltage battery module and other modules, thereby isolating the high-voltage battery module from the vehicle system to prevent thermal runaway from causing more serious accidents.

[0064] At the same time, the BMS system will also control the vehicle to stay away from the high-voltage battery module through the drive module 10 to ensure the safety of personnel. The drive module 10 includes the motor, reducer and wheel hub of the new energy vehicle itself.

[0065] In some specific embodiments, the battery cells 6 of the high-voltage battery module 8 are provided with temperature and voltage sensors 1 , so that different battery cells 6 can be monitored separately.

[0066] In some specific embodiments, a high-voltage distribution box 11 is further included, and the DCDC module 7 is electrically connected to the driving module 10 and the high-voltage battery module 8 respectively through the high-voltage distribution box 11 .

[0067] Specifically, the high-voltage distribution box 11 is responsible for distributing and transmitting power between the high-voltage battery module 8 and other electric drive components (such as the drive module 10 and the DCDC module 7). It ensures that the power of the high-voltage battery module 8 can be converted into power suitable for the low-voltage battery module 9 through the DCDC module 7, and also ensures that the high-voltage battery module provides sufficient power to the drive module to support the vehicle's driving function.

[0068] In some specific embodiments, the low-voltage battery module 9 is electrically connected to the electronic suspension system 12 and the on-board electronic appliance 13 of the vehicle respectively;

[0069] The electronic suspension system 12 and the on-board electronic appliances 13 are electrically used to keep the new energy vehicle away from the high-voltage battery module 8 .

[0070] Specifically, the electronic suspension system 12 provides power through the low-voltage battery module 9 to control the suspension state of the vehicle, thereby maintaining the smooth operation of the vehicle. The coordinated work of the electronic suspension system 12 and the on-board electronic appliances 13 can ensure that after the escape strategy is triggered, the vehicle can not only be physically separated from the high-voltage battery module quickly, but also maintain the safety and stability of the vehicle with the support of the electronic control system; for example, the on-board electronic system can monitor the vehicle status in real time, while the electronic suspension system ensures that the vehicle will not be affected by external vibrations or unstable ground conditions.

[0071] In some specific embodiments, after obtaining the completed unlocking signal sent by the unlocking mechanism 4, the driving module 10 is driven by the low-voltage battery module 9 and the DCDC module 7 to provide power, including: after the BMS system 5 obtains the completed unlocking signal sent by the unlocking mechanism 4, the DCDC module 7 converts the low-voltage current of the battery system that can be separated from the vehicle body into high-voltage current, and controls the driving module 10 to provide power through the high-voltage distribution box 11.

[0072] In some specific embodiments, the unlocking mechanism 4 is provided on the new energy vehicle and includes:

[0073] The signal processing system is used to obtain signals from the vehicle and the BMS system 5, and to send a release completion signal to the BMS system 5, thereby realizing the separation of the high-voltage battery module 8. The signals from the vehicle (such as battery status, temperature, pressure and other data) and the monitoring signals of the BMS system 5 (such as overtemperature, battery failure, etc.) are all sent to the signal processing system. The signal processing system determines the safety of the high-voltage battery module 8 by analyzing these signals. Once a potential danger (such as thermal runaway, overvoltage, etc.) is detected in the high-voltage battery module 8, the release mechanism will be triggered to separate it;

[0074] The electronic control switch is used to connect and disconnect the high-voltage battery module 8 and the new energy vehicle according to the signal of the signal processing system. After receiving the signal of the signal processing system, the electronic control switch controls the connection or disconnection of the circuit, thereby realizing the separation of the high-voltage battery module 8. Usually, the electronic control switch realizes its control function through electronic components such as relays and solid-state switches. After receiving the control signal from the signal processing system, these components can respond quickly to ensure the safe disconnection of the high-voltage battery module;

[0075] The high-voltage system separation structure is used to connect and disconnect the high-voltage battery module according to the switching signal of the electronic control switch. After the electronic control switch receives the disconnection signal, the high-voltage system separation structure will physically disconnect the electrical connection between the high-voltage battery module 8 and the vehicle. This structure usually includes mechanical components such as plugs, sockets, and locks to ensure that the battery module is separated from the vehicle by electrical or mechanical means.

[0076] In some specific embodiments, the present application proposes a control method for a battery system that can be separated from a vehicle body as described in the above embodiment, comprising the following steps:

[0077] The BMS system 5 determines whether to trigger the escape strategy according to the state of the high-voltage battery module 8 and sends a signal to the unlocking mechanism 4;

[0078] The unlocking mechanism 4 controls the high-voltage battery module 8 to be released from the vehicle according to the signal of the BMS system 5 , and sends an unlocking completion signal to the BMS system 5 ;

[0079] The BMS system 5 controls the low-voltage battery module 9 to supply power to the drive module 10 according to the unlocking completion signal.

[0080] In some specific embodiments, the BMS system 5 determines whether to trigger the escape strategy based on the state of the high-voltage battery module 8, including: collecting information from the gas concentration sensor, the pressure sensor 2, and the temperature sensor 3 through the BMS system 5, and calculating the probability of thermal runaway of the high-voltage system through a pre-designed battery thermal runaway model; if the calculated probability is higher than the set escape threshold, the escape strategy is triggered.

[0081] In some specific embodiments, the BMS system 5 controls the low-voltage battery module 9 to supply power to the drive module 10 according to the unlocking completion signal, including: after the BMS system 5 obtains the unlocking completion signal sent by the unlocking mechanism 4, the DCDC module 7 converts the low voltage of the battery system that can be separated from the vehicle body into high voltage to supply power to the drive module 10.

[0082] In some specific embodiments, the present application proposes a new energy vehicle, including a battery system that can be detached from the vehicle body as described in the above embodiments.

[0083] The above is only a specific implementation of the embodiment of the present invention, but the protection scope of the embodiment of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiment of the present invention should be included in the protection scope of the embodiment of the present invention. Therefore, the protection scope of the embodiment of the present invention should be based on the protection scope of the claims.

Claims

1. A battery system that can be separated from the vehicle body, used in a new energy vehicle including a drive module, characterized in that: include: A high-voltage battery module, a low-voltage battery module, a DCDC module, a release mechanism and a BMS system, wherein the DCDC module is electrically connected to the low-voltage battery module and the high-voltage battery module respectively, the low-voltage battery module is electrically connected to the release mechanism, the high-voltage battery module is electrically connected to the drive module and supplies power to the drive module, and the BMS system is electrically connected to the low-voltage battery module, the DCDC module, the release mechanism, the drive module and the high-voltage battery module respectively; The DCDC module is used to convert the high voltage current of the high voltage battery module of the new energy vehicle into a low voltage current suitable for charging the low voltage battery module and to convert the low voltage current of the low voltage battery module into a high voltage current to drive the driving module; The unlocking mechanism is used to control the connection status of the high-voltage battery module with the new energy vehicle and the drive module according to the signal of the BMS system, and send the unlocking signal to the BMS system; The BMS system is used to trigger the escape strategy according to the status of the high-voltage battery module. When the escape strategy is triggered, the high-voltage signal of the high-voltage battery module is cut off and the unlocking mechanism is controlled to disengage the high-voltage battery module. After obtaining the completed unlocking signal sent by the unlocking mechanism, the drive module is driven by the low-voltage battery module and the DCDC module to provide power for the vehicle.

2. A battery system detachable from a vehicle body according to claim 1, characterized in that: The high-voltage battery module includes a gas concentration sensor, a pressure sensor, a temperature sensor and a high-voltage battery; The gas concentration sensor, pressure sensor and temperature sensor are used to collect status information of the high-voltage battery; The BMS system collects information from gas concentration sensors, pressure sensors, and temperature sensors, and uses a pre-designed battery thermal runaway model to calculate the probability of thermal runaway in the high-voltage system. If the calculated probability is higher than the set escape threshold, the escape strategy is triggered.

3. A battery system detachable from a vehicle body according to claim 1, characterized in that: It also includes a high-voltage distribution box, and the DCDC module is electrically connected to the drive module and the high-voltage battery module through the high-voltage distribution box.

4. A battery system detachable from a vehicle body according to claim 1, characterized in that: The low-voltage battery module is electrically connected to the electronic suspension system and the on-board electronic appliances of the vehicle respectively; The electronic suspension system and the on-board electronic appliances are electrically used to keep the new energy vehicle away from the high-voltage battery module.

5. A battery system detachable from a vehicle body according to claim 3, characterized in that: The method of driving the drive module to provide power through the low-voltage battery module and the DCDC module after obtaining the completed unlocking signal sent by the unlocking mechanism includes: after the BMS system obtains the completed unlocking signal sent by the unlocking mechanism, the DCDC module converts the low-voltage current of the battery system that can be separated from the vehicle body into high-voltage current, and controls the drive module to provide power through the high-voltage distribution box.

6. A battery system detachable from a vehicle body according to claim 1, characterized in that: The unlocking mechanism comprises: The signal processing system is used to obtain signals from the vehicle and the BMS system, and to send the unlocking completion signal to the BMS system; An electronic control switch for connecting and disconnecting the high-voltage battery module and the new energy vehicle according to the signal of the signal processing system; The high-voltage system separation structure is used to connect and disconnect the high-voltage battery module according to the switching signal of the electronic control switch.

7. A control method for a battery system detachable from a vehicle body as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: The BMS system determines whether to trigger the escape strategy based on the status of the high-voltage battery module and sends a signal to the unlocking mechanism; The unlocking mechanism controls the high-voltage battery module to be released from the vehicle according to the signal of the BMS system, and sends the unlocking completion signal to the BMS system; The BMS system controls the low-voltage battery module to supply power to the drive module based on the unlocking completion signal.

8. The method for controlling a battery system detachable from a vehicle body according to claim 7, characterized in that: The BMS system determines whether to trigger the escape strategy according to the state of the high-voltage battery module, including: The BMS system collects information from gas concentration sensors, pressure sensors, and temperature sensors, and uses a pre-designed battery thermal runaway model to calculate the probability of thermal runaway in the high-voltage system. If the calculated probability is higher than the set escape threshold, the escape strategy is triggered.

9. The method for controlling a battery system detachable from a vehicle body according to claim 7, characterized in that: The BMS system controls the low-voltage battery module to supply power to the drive module according to the unlocking completion signal, including: after the BMS system obtains the unlocking completion signal sent by the unlocking mechanism, the DCDC module converts the low voltage of the battery system that can be separated from the vehicle body into high voltage to supply power to the drive module.

10. A new energy vehicle, comprising a battery system detachable from the vehicle body as claimed in any one of claims 1 to 6.

Images