Power battery pack separation system and method for coping with thermal runaway of battery of electric vehicle

Abstract

The invention discloses a power battery pack separation system and method for coping with thermal runaway of a battery of an electric vehicle. The system comprises a control line interface, a high-voltage line interface, a coolant inlet and outlet, a low-voltage line interface, a cooling pipeline, a thread, a screw, a pipe wall at the separation part of the cooling pipeline, a rotating motor, a connecting rod, a fixing piece, a stepping motor, a coupler, a ball screw, a ball nut and a wire connector. The method comprises the steps that if thermal runaway happens to the power battery pack, the electromagnetic valve is closed, fixation of the power battery pack is cancelled, separation of a cooling pipeline is achieved, one end of the wire connector is made to be disconnected with the control line interface or the high-voltage line interface or the low-voltage line interface, and connection between a wire in the electric automobile and the power battery pack is disconnected. The power battery can be separated from the electric vehicle during the period from thermal runaway of the power battery to ignition of the electric vehicle, so that casualties and property loss are reduced, and the method is suitable for various electric vehicles.

Description

Technical Field

[0001] The present invention relates to the field of thermal runaway prevention for power battery packs, and in particular to a power battery pack separation system and method for coping with thermal runaway of electric vehicle batteries. Background Art

[0002] Power batteries are the source of power for new energy vehicles. As a new energy product that is increasingly widely used, power batteries can cause huge losses of life and property when thermal runaway occurs. In the absence of mature and widely used technical means to prevent the spread of battery thermal runaway, throwing the battery out during the period from when the battery starts to thermally runaway to when it is about to ignite other parts of the electric vehicle can minimize the loss of life and property. Summary of the invention

[0003] The purpose of the present invention is to provide a power battery pack separation system for coping with thermal runaway of electric vehicle batteries, including a control line interface, a high-voltage line interface, a coolant inlet and outlet, a low-voltage line interface, a cooling pipe, a solenoid valve, a cooling pipe separation, threads, screws, a pipe wall at the cooling pipe separation, a rotating motor, a connecting rod, a fixing, a stepping motor, a coupling, a ball screw, a ball nut, and a connector.

[0004] The control line interface is connected to the outside world to output control signals for the battery management system.

[0005] The high-voltage line interface outputs high-voltage electricity for the electric vehicle.

[0006] The coolant inlet and outlet are connected to the cooling pipe in the electric vehicle to provide low-temperature coolant to the power battery pack and output high-temperature coolant.

[0007] The low-voltage line interface outputs low-voltage electricity for the electric vehicle.

[0008] The threads and screws are used to fix the power battery pack and connect the cooling pipe.

[0009] The rotating motor is connected with the screws through a connecting rod and a fixing member.

[0010] The stepper motor is connected to the ball screw through a coupling.

[0011] The ball screw is connected to the connector through interference fit.

[0012] One end of the connector is connected to the wire in the electric vehicle, and the other end is connected to the control line interface, the high-voltage line interface or the low-voltage line interface.

[0013] The ball nut converts the rotational motion of the ball screw into linear motion.

[0014] When thermal runaway occurs in the power battery pack, the rotating motor removes the screws to cancel the fixation of the power battery pack and separate the cooling pipe.

[0015] The stepper motor reverses, driving the ball screw and the connector to move linearly in the direction of the stepper motor, so that one end of the connector is disconnected from the control line interface, the high-voltage line interface or the low-voltage line interface, thereby disconnecting the wires in the electric vehicle from the power battery pack.

[0016] Furthermore, a solenoid valve is also included.

[0017] The solenoid valve controls the flow of coolant in the cooling pipe.

[0018] When the power battery pack is in normal working state, the solenoid valve is opened and the battery thermal management system works normally.

[0019] When thermal runaway occurs in the power battery pack, the solenoid valve is closed to prevent coolant from flowing out when the cooling pipe is separated.

[0020] Furthermore, when thermal runaway occurs in the power battery pack, the cooling pipe is separated at the cooling pipe separation point.

[0021] Furthermore, the cooling pipe separation point is located between two solenoid valves.

[0022] Furthermore, the cooling pipe is separated into pipe I and pipe II at the cooling pipe separation point, and the pipe walls of pipe I and pipe II are connected by threads or screws.

[0023] Furthermore, the number of the screws is an even number.

[0024] The screws are symmetrically distributed on both sides of the cooling pipe.

[0025] Furthermore, before operation, a running test is performed on the rotating electrical machine to determine the running time of the rotating electrical machine when it is reversed.

[0026] Furthermore, before operation, a running test is performed on the stepper motor to determine the running time of the stepper motor when it is reversed.

[0027] Furthermore, the connecting rod moves in a horizontal direction.

[0028] The method based on the power battery pack separation system comprises the following steps:

[0029] 1) Start the power battery pack and open the solenoid valve.

[0030] 2) Monitor the operating status of the power battery pack in real time. If the power battery pack is in normal working condition, maintain the current state. If the power battery pack has thermal runaway, go to step 3).

[0031] 3) Close the solenoid valve;

[0032] The rotating motor is driven to reverse, so that the rotating motor takes out the screws, thereby canceling the fixation of the power battery pack and realizing the separation of the cooling pipe;

[0033] Driving the stepper motor to reverse, so that the stepper motor drives the ball screw and the connector to move linearly in the direction of the stepper motor, thereby disconnecting one end of the connector from the control line interface, the high-voltage line interface or the low-voltage line interface, and disconnecting the wires in the electric vehicle from the power battery pack;

[0034] 4) The power battery pack system is separated from the electric vehicle, and the electric vehicle travels to a safe distance based on the initial speed.

[0035] The technical effect of the present invention is unquestionable. The power battery pack separation method proposed in this application can prevent the further expansion of the fire when the battery thermal runaway occurs in the electric vehicle, thereby reducing the loss of life and property, and has very important research significance and application value. The present application can automatically separate the cooling pipe, the power battery, and the connecting harness according to whether the power battery pack has thermal runaway. It has the advantages of high efficiency and speed, and can be used in a variety of vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is the input and output interface of the power battery pack.

[0037] Figure 2 Schematic diagram of the cooling duct and bolt layout of the power battery pack.

[0038] Figure 3 Schematic diagram of the pipe wall connection at the separation point of the cooling pipe.

[0039] Figure 4 It is a connection diagram of the rotating motor, connecting rod and fixing parts.

[0040] Figure 5 Schematic diagram of the wire disconnect device.

[0041] Figure 6 It is a control flow diagram.

[0042] In the figure: control line interface 1, high-voltage line interface 2, coolant inlet and outlet 3, low-voltage line interface 4, cooling pipe 5, solenoid valve 6, cooling pipe separation 7, thread 8, screw 9, pipe wall at the cooling pipe separation 10, rotating motor 11, connecting rod 12, fixing part 13, stepping motor 14, coupling 15, ball screw 16, ball nut 17, connector 18. DETAILED DESCRIPTION

[0043] The present invention is further described below in conjunction with the embodiments, but it should not be understood that the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various substitutions and changes are made according to the common technical knowledge and customary means in the art, which should all be included in the protection scope of the present invention.

[0044] Embodiment 1:

[0045] See also Figures 1 to 6 A power battery pack separation system for dealing with thermal runaway of electric vehicle batteries includes a control line interface 1, a high-voltage line interface 2, a coolant inlet and outlet 3, a low-voltage line interface 4, a cooling pipe 5, a solenoid valve 6, a cooling pipe separation 7, a thread 8, a screw 9, a pipe wall 10 at the cooling pipe separation, a rotating motor 11, a connecting rod 12, a fixing part 13, a stepping motor 14, a coupling 15, a ball screw 16, a ball nut 17, and a connector 18.

[0046] The control line interface 1 is connected to the outside world to output control signals for the battery management system.

[0047] The high-voltage line interface 2 outputs high-voltage electricity for the electric vehicle.

[0048] The coolant inlet and outlet 3 is connected to a cooling pipe 5 in the electric vehicle to provide low-temperature coolant to the power battery pack and output high-temperature coolant.

[0049] The low-voltage line interface 4 outputs low-voltage electricity for the electric vehicle.

[0050] The threads 8 and screws 9 are used to fix the power battery pack and connect the cooling pipe 5 .

[0051] The rotary motor 11 is connected to the screw 9 via a connecting rod 12 and a fixing member 13 .

[0052] The stepper motor 14 is connected to the ball screw 16 via a coupling 15 .

[0053] The ball screw 16 is connected to the connector 18 by interference fit.

[0054] One end of the connector 18 is connected to the wire in the electric vehicle, and the other end is connected to the control line interface 1, the high-voltage line interface 2 or the low-voltage line interface 4.

[0055] The ball nut 17 converts the rotational motion of the ball screw 16 into linear motion.

[0056] When thermal runaway occurs in the power battery pack, the rotating motor 11 removes the screws 9 to cancel the fixation of the power battery pack and separate the cooling pipe 5 .

[0057] The stepper motor 14 reverses, driving the ball screw 16 and the connector 18 to move linearly in the direction of the stepper motor 14, so that one end of the connector 18 is disconnected from the control line interface 1, the high-voltage line interface 2 or the low-voltage line interface 4, thereby disconnecting the wires in the electric vehicle from the power battery pack.

[0058] A solenoid valve 6 is also included.

[0059] The solenoid valve 6 controls the flow of coolant in the cooling pipe 5 .

[0060] When the power battery pack is in normal working state, the solenoid valve 6 is open and the battery thermal management system works normally.

[0061] When thermal runaway occurs in the power battery pack, the solenoid valve 6 is closed to prevent the coolant from flowing out when the cooling pipe 5 is separated.

[0062] When thermal runaway occurs in the power battery pack, the cooling pipe 5 is separated at the cooling pipe separation point 7 .

[0063] The cooling pipe separation point 7 is located between the two solenoid valves 6 .

[0064] The cooling pipe 5 is separated into a pipe I and a pipe II at a cooling pipe separation point 7 , and pipe walls 10 of the pipe I and the pipe II are connected by threads 8 and screws 9 .

[0065] The number of the screws 9 is an even number.

[0066] The screws 9 are symmetrically distributed on both sides of the cooling pipe 5 .

[0067] Before operation, a running test is performed on the rotating motor 11 to determine the running time of the rotating motor 11 when it is reversed.

[0068] Before operation, a running test is performed on the stepper motor 14 to determine the running time of the stepper motor 14 when it is reversed.

[0069] The connecting rod 13 moves in the horizontal direction.

[0070] Embodiment 2:

[0071] A power battery pack separation system for coping with thermal runaway of electric vehicle batteries includes a control line interface 1, a high-voltage line interface 2, a coolant inlet and outlet 3, a low-voltage line interface 4, a cooling pipe 5, a solenoid valve 6, a cooling pipe separation 7, a thread 8, a screw 9, a pipe wall 10 at the cooling pipe separation, a rotating motor 11, a connecting rod 12, a fixing part 13, a stepping motor 14, a coupling 15, a ball screw 16, a ball nut 17, and a connector 18.

[0072] The control line interface 1 is connected to the outside world to output control signals for the battery management system.

[0073] The high-voltage line interface 2 outputs high-voltage electricity for the electric vehicle.

[0074] The coolant inlet and outlet 3 is connected to a cooling pipe 5 in the electric vehicle to provide low-temperature coolant to the power battery pack and output high-temperature coolant.

[0075] The low-voltage line interface 4 outputs low-voltage electricity for the electric vehicle.

[0076] The threads 8 and screws 9 are used to fix the power battery pack and connect the cooling pipe 5 .

[0077] The rotary motor 11 is connected to the screw 9 via a connecting rod 12 and a fixing member 13 .

[0078] The stepper motor 14 is connected to the ball screw 16 via a coupling 15 .

[0079] The ball screw 16 is connected to the connector 18 by interference fit.

[0080] One end of the connector 18 is connected to the wire in the electric vehicle, and the other end is connected to the control line interface 1, the high-voltage line interface 2 or the low-voltage line interface 4.

[0081] The ball nut 17 converts the rotational motion of the ball screw 16 into linear motion.

[0082] When thermal runaway occurs in the power battery pack, the rotating motor 11 removes the screws 9 to cancel the fixation of the power battery pack and separate the cooling pipe 5 .

[0083] The stepper motor 14 reverses, driving the ball screw 16 and the connector 18 to move linearly in the direction of the stepper motor 14, so that one end of the connector 18 is disconnected from the control line interface 1, the high-voltage line interface 2 or the low-voltage line interface 4, thereby disconnecting the wires in the electric vehicle from the power battery pack.

[0084] Embodiment 3:

[0085] A power battery pack separation system for coping with thermal runaway of electric vehicle batteries, the technical content of which is the same as that of Example 2, and further includes a solenoid valve 6.

[0086] The solenoid valve 6 controls the flow of coolant in the cooling pipe 5 .

[0087] When the power battery pack is in normal working state, the solenoid valve 6 is open and the battery thermal management system works normally.

[0088] When thermal runaway occurs in the power battery pack, the solenoid valve 6 is closed to prevent the coolant from flowing out when the cooling pipe 5 is separated.

[0089] Embodiment 4:

[0090] A power battery pack separation system for coping with thermal runaway of electric vehicle batteries, the technical content of which is the same as any one of embodiments 2-3, and further, when thermal runaway occurs in the power battery pack, the cooling pipe 5 is separated at the cooling pipe separation point 7.

[0091] Embodiment 5:

[0092] A power battery pack separation system for coping with thermal runaway of electric vehicle batteries, the technical content of which is the same as any one of embodiments 2-4, and further, the cooling pipe separation point 7 is located between two solenoid valves 6.

[0093] Embodiment 6:

[0094] A power battery pack separation system for coping with thermal runaway of electric vehicle batteries, the technical content of which is the same as any one of embodiments 2-5, and further, a cooling pipe 5 is separated into a pipe I and a pipe II at a cooling pipe separation point 7, and pipe walls 10 of pipes I and II are connected by threads 8 and screws 9.

[0095] Embodiment 7:

[0096] A power battery pack separation system for coping with thermal runaway of electric vehicle batteries, the technical content of which is the same as any one of Examples 2-6, and further, the number of the screws 9 is an even number.

[0097] The screws 9 are symmetrically distributed on both sides of the cooling pipe 5 .

[0098] Embodiment 8:

[0099] A power battery pack separation system for coping with thermal runaway of electric vehicle batteries, the technical content of which is the same as any one of Examples 2-7. Furthermore, before operation, an operation test is performed on the rotating motor 11 to determine the operating time of the rotating motor 11 when it is reversed.

[0100] Embodiment 9:

[0101] A power battery pack separation system for coping with thermal runaway of electric vehicle batteries, the technical content of which is the same as any one of Examples 2-8. Furthermore, before operation, a running test is performed on the stepper motor 14 to determine the running time of the stepper motor 14 when it is reversed.

[0102] Embodiment 10:

[0103] A power battery pack separation system for coping with thermal runaway of electric vehicle batteries, the technical content of which is the same as any one of embodiments 2-9, and further, the connecting rod 13 moves in the horizontal direction.

[0104] Embodiment 11:

[0105] The method for separating the power battery pack according to any one of embodiments 1 to 10 comprises the following steps:

[0106] 1) Start the power battery pack and open the solenoid valve 6.

[0107] 2) Monitor the operating status of the power battery pack in real time. If the power battery pack is in normal working condition, maintain the current state. If the power battery pack has thermal runaway, go to step 3).

[0108] 3) Close the solenoid valve 6;

[0109] The rotating motor is driven to reverse, so that the rotating motor 11 removes the screw 9, thereby canceling the fixation of the power battery pack and realizing the separation of the cooling pipe 5;

[0110] Driving the stepper motor 14 to reverse, so that the stepper motor 14 drives the ball screw 16 and the connector 18 to move linearly in the direction of the stepper motor 14, and then disconnecting one end of the connector 18 from the control line interface 1, the high-voltage line interface 2 or the low-voltage line interface 4, and disconnecting the wires in the electric vehicle from the power battery pack;

[0111] 4) The power battery pack system is separated from the electric vehicle, and the electric vehicle travels to a safe distance based on the initial speed.

[0112] Embodiment 12:

[0113] A power battery pack separation system for coping with thermal runaway of electric vehicle batteries, comprising a control line interface 1, a high-voltage line interface 2, a coolant inlet and outlet 3, a low-voltage line interface 4, a cooling pipe 5, a solenoid valve 6, a cooling pipe separation 7, a thread 8, a screw 9, a pipe wall 10 at the cooling pipe separation, a rotating motor 11, a connecting rod 12, a fixing part 13, a stepping motor 14, a coupling 15, a ball screw 16, a ball nut 17, and a connector 18;

[0114] The control line interface 1 is connected to the outside world to output control signals for the battery management system (BMS);

[0115] The high-voltage line interface 2 outputs high-voltage electricity to the electric vehicle to meet the power demand of corresponding components;

[0116] The coolant inlet and outlet 3 are connected to the cooling pipe 5 in the electric vehicle to provide low-temperature coolant to the power battery pack and output high-temperature coolant to meet the thermal management requirements of the power battery pack;

[0117] The low-voltage line interface 4 outputs low-voltage electricity to the electric vehicle to meet the power demand of corresponding components;

[0118] The solenoid valve 6 controls the coolant flow in the cooling pipe 5. When the power battery pack is in normal working state, the solenoid valve 6 is opened, and the battery thermal management system (BTMS) works normally; when the power battery pack has thermal runaway, the solenoid valve 6 is closed to prevent the coolant from flowing out when the cooling pipe 5 is separated;

[0119] The cooling pipe separation point 7 refers to the place where the cooling pipe 5 is separated when thermal runaway occurs in the power battery pack;

[0120] The thread 8 and the screw 9 are used to fix the power battery pack and connect the cooling pipe 5. When the power battery pack has thermal runaway, the screw 9 is removed by the rotating motor 11 to cancel the fixation of the power battery pack and separate the cooling pipe 5.

[0121] The rotating motor 11 is connected to the screw 9 through the connecting rod 12 and the fixing member 13. When the power battery pack has thermal runaway, the rotating motor 11 is reversed to remove the screw 9.

[0122] The stepper motor 14 is connected to the ball screw 16 through the coupling 15, and the ball screw 16 is connected to the connector 18 through interference fit, and the two ends of the connector 18 are used to connect the wires in the electric vehicle and the control line interface 1, the high-voltage line interface 2 or the low-voltage line interface 4 on the power battery pack respectively;

[0123] The ball nut 17 converts the rotational motion of the ball screw 16 into linear motion. When thermal runaway occurs in the power battery pack, the stepper motor 14 reverses, driving the ball screw 16 and the connector 18 to move linearly in the direction of the stepper motor 14, so that one end of the connector 18 is disconnected from the control line interface 1, the high-voltage line interface 2 or the low-voltage line interface 4, thereby disconnecting the wires in the electric vehicle from the power battery pack.

[0124] The pipe wall 10 of the cooling pipe separation part 7 is connected by the screw 9. To meet the feasibility of the screw 9 connection, the pipe wall 11 of the cooling pipe separation part here should be thickened;

[0125] The cooling pipe separation point 7 is located between the two solenoid valves 6. The cooling pipe 5 is separated after the solenoid valve 6 is closed to prevent the coolant in the liquid storage tank and the power battery pack in the electric vehicle from flowing out after the cooling pipe 5 is separated.

[0126] The screw 9 is quickly removed by reverse rotation of the rotary motor 11 to achieve rapid release of the power battery pack.

[0127] It is necessary to perform an operation test on the rotating motor 11 to determine the running time of the rotating motor 11 when it is reversed.

[0128] It is necessary to perform a running test on the stepper motor 14 to determine the running time of the stepper motor 14 when it is reversed.

[0129] The connecting rod 12 is used to transmit power from the rotating motor 11 to the screw 9 . Since the screw 9 moves in the horizontal direction, the connecting rod 13 is required to be able to move in the horizontal direction.

[0130] The number of the screws 9 used to connect the pipe wall 10 at the separation point of the cooling pipe is 2, and they are symmetrically distributed on both sides of the cooling pipe 5, so that after the screws 9 are taken out, the cooling pipe 5 can be quickly separated under the action of gravity.

[0131] This application starts from three aspects: separation of cooling pipes, cancellation of power battery pack fixation, and separation of power battery pack connection harnesses, and separates the power battery pack when thermal runaway occurs to reduce casualties and property losses.

[0132] When the battery management system detects that the power battery pack has thermal runaway, the battery management system controls the solenoid valve in the cooling pipe to close, and then sends a command to the rotating motor to reverse at a specified speed for a certain period of time, removes the screw from the pipe wall at the separation point of the cooling pipe, and allows the cooling pipe to separate naturally under the action of gravity.

[0133] After the cooling pipe is separated, the battery management system sends a command to the rotating motor connected to the screw, causing it to reverse at a specified speed for a certain period of time and remove the screw from the connection to cancel the fixation of the power battery pack.

[0134] After the power battery pack is unfixed, the battery management system sends a command to the stepper motor to control the separation of the power battery pack connection harness, specifically in the following manner: the power battery pack is connected to the wires in the electric vehicle via the connector, the connector is connected to the stepper motor via the ball screw and the coupling, and the connector and the ball screw are connected via an interference fit, the battery management system sends a signal to reverse the stepper motor, the ball screw converts the rotation of the stepper motor into linear motion, and drives the connector to separate from the harness interface on the power battery pack, thereby completing the separation of the last connection between the power battery pack and the electric vehicle.

[0135] Embodiment 13:

[0136] A method for using a power battery separation system to deal with battery thermal runaway in an electric vehicle, the process is as follows:

[0137] Combination Figure 1 As shown, the layout positions of the wiring harness interface and the coolant input and output terminals can be observed. After determining the layout of the wiring harness interface and cooling pipe of the power battery pack, a separation plan for the power battery pack can be formulated accordingly.

[0138] The separation of the cooling pipe 5 includes closing the solenoid valve 6 and removing the screw 9, combined with Figure 2 As shown, when the battery management system determines that the power battery pack has thermal runaway through the data obtained by monitoring, it sends a closing command to the solenoid valves 6 at both ends of the cooling pipe separation 7. After the solenoid valves 6 are completely closed, the battery management system controls the rotating motor 11 to remove the screw 9. Figure 3 As shown, after the screws 9 are taken out, the cooling pipe 5 is automatically separated under the action of gravity.

[0139] Combination Figure 4 As shown, the power battery pack is unfixed by means of the reverse rotation of the rotating motor 11. The rotating motor 11 rapidly reverses after receiving a control signal from the battery management system, driving the screw 9 to remove it from the connection between the power battery pack and the electric vehicle.

[0140] After the power battery pack is unfastened, Figure 5 As shown, the battery management system sends a control signal to the stepper motor 14 to control its reverse rotation and drive the ball screw 16 to move horizontally through the coupling 15. Since the ball screw 16 and the connector 18 are connected by interference fit, the connector 18 moves horizontally at the same time and is disconnected from the wiring harness interface of the power battery pack.

[0141] It is worth noting that the reversal time of the rotating motor 11 needs to be determined through corresponding tests to determine how long it takes to remove the screw 9. Since the position of the screw 9 is constantly changing, it is necessary for the connecting rod 12 connected to the screw 9 to be able to move in the horizontal direction. The present application provides a horizontal groove at the connection between the connecting rod 12 and the rotating motor 11, so that the connecting rod 12 can automatically adjust its position during the process of removing the screw 9. The specific design structure is combined with Figure 4 shown.

[0142] After completing the above operations, the electric vehicle opens a channel to throw out the power battery pack, and at the same time the electric vehicle continues to move to a safe distance at the initial speed to prevent the power battery pack from catching fire and igniting the electric vehicle after thermal runaway occurs.

[0143] Embodiment 14:

[0144] A method for using a power battery separation system to deal with battery thermal runaway in an electric vehicle, the control flow chart of which is as follows: Figure 6 As shown, the following steps are included:

[0145] 1) Determine whether thermal runaway occurs in the power battery pack;

[0146] 2) If the power battery pack experiences thermal runaway, the solenoid valve is closed, the rotary motor is reversed to unscrew the screw, and the cooling pipe is separated under the action of gravity;

[0147] 3) The rotating motor is reversed to remove the screws used to fix the power battery pack, and the power battery pack is unfixed;

[0148] 4) The stepper motor reverses to drive the connector to separate it from the control line interface, the high-voltage line interface or the low-voltage line interface, and the wires in the electric vehicle are disconnected from the power battery pack;

[0149] 5) The power battery pack system is separated from the electric vehicle, and the electric vehicle travels to a safe distance based on the initial speed.

Claims

1. A power battery pack separation system for dealing with thermal runaway of electric vehicle batteries, characterized in that: The invention comprises a control line interface (1), a high-voltage line interface (2), a coolant inlet and outlet (3), a low-voltage line interface (4), a cooling pipe (5), a thread (8), a screw (9), a pipe wall at a separation point of the cooling pipe (10), a rotating motor (11), a connecting rod (12), a fixing part (13), a stepping motor (14), a coupling (15), a ball screw (16), a ball nut (17), and a connector (18). The control line interface (1) is connected to the outside world to output a control signal for the battery management system; The high-voltage line interface (2) outputs high-voltage electricity to the electric vehicle; The coolant inlet and outlet (3) is connected to a cooling pipe (5) in the electric vehicle to provide low-temperature coolant to the power battery pack and output high-temperature coolant; The low-voltage line interface (4) outputs low-voltage electricity to the electric vehicle; The threads (8) and screws (9) are used to fix the power battery pack and connect the cooling pipe (5); The rotating motor (11) is connected to the screw (9) via a connecting rod (12) and a fixing member (13); The stepper motor (14) is connected to the ball screw (16) via a coupling (15); The ball screw (16) is connected to the connector (18) by interference fit; One end of the connector (18) is connected to a wire in the electric vehicle, and the other end is connected to a control line interface (1), the high-voltage line interface (2) or the low-voltage line interface (4); The ball nut (17) converts the rotational motion of the ball screw (16) into linear motion; When the power battery pack experiences thermal runaway, the rotating motor (11) removes the screw (9) to cancel the fixation of the power battery pack and separates the cooling pipe (5); The stepper motor (14) rotates in reverse, driving the ball screw (16) and the connector (18) to move linearly in the direction of the stepper motor (14), so that one end of the connector (18) is disconnected from the control line interface (1), the high-voltage line interface (2) or the low-voltage line interface (4), thereby disconnecting the wire in the electric vehicle from the power battery pack.

2. The power battery pack separation system for coping with thermal runaway of electric vehicle batteries according to claim 1 is characterized in that: Also includes a solenoid valve (6); The solenoid valve (6) controls the circulation of the coolant in the cooling pipe (5); When the power battery pack is in a normal working state, the solenoid valve (6) is opened and the battery thermal management system works normally; When thermal runaway occurs in the power battery pack, the solenoid valve (6) is closed to prevent the coolant from flowing out when the cooling pipe (5) is separated.

3. The power battery pack separation system for coping with thermal runaway of electric vehicle batteries according to claim 2 is characterized in that: When thermal runaway occurs in the power battery pack, the cooling pipe (5) is separated at the cooling pipe separation point (7).

4. The power battery pack separation system for coping with thermal runaway of electric vehicle batteries according to claim 3 is characterized in that: The cooling pipe separation point (7) is located between the two solenoid valves (6).

5. The power battery pack separation system for coping with thermal runaway of electric vehicle batteries according to claim 3 is characterized in that: The cooling pipe (5) is separated into a pipe I and a pipe II at a cooling pipe separation point (7), and the pipe walls (10) of the pipe I and the pipe II are connected by means of threads (8) and screws (9).

6. The power battery pack separation system for coping with thermal runaway of electric vehicle batteries according to claim 5 is characterized in that: The number of the screws (9) is an even number; The screws (9) are symmetrically distributed on both sides of the cooling pipe (5).

7. The power battery pack separation system for coping with thermal runaway of electric vehicle batteries according to claim 1 is characterized in that: Before operation, a running test is performed on the rotating electric machine (11) to determine the running time of the rotating electric machine (11) when it rotates in reverse.

8. The power battery pack separation system for coping with thermal runaway of electric vehicle batteries according to claim 1 is characterized in that: Before operation, a running test is performed on the stepper motor (14) to determine the running time of the stepper motor (14) when it is reversed.

9. The power battery pack separation system for coping with thermal runaway of electric vehicle batteries according to claim 4, characterized in that: The connecting rod (13) moves in the horizontal direction.

10. The method of separating the power battery pack according to any one of claims 1 to 9, characterized in that: The following steps are involved: 1) Start the power battery pack and open the solenoid valve (6); 2) Monitor the operating status of the power battery pack in real time. If the power battery pack is in normal working state, maintain the current state. If the power battery pack has thermal runaway, proceed to step 3); 3) Close the solenoid valve (6); The rotating motor is driven to rotate in reverse, so that the rotating motor (11) removes the screw (9), thereby canceling the fixation of the power battery pack and realizing the separation of the cooling pipe (5); The stepper motor (14) is driven to rotate in reverse, so that the stepper motor (14) drives the ball screw (16) and the connector (18) to move linearly in the direction of the stepper motor (14), thereby disconnecting one end of the connector (18) from the control line interface (1), the high-voltage line interface (2) or the low-voltage line interface (4), thereby disconnecting the wire in the electric vehicle from the power battery pack; 4) The power battery pack system is separated from the electric vehicle, and the electric vehicle travels to a safe distance based on the initial speed.

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