Battery pack and battery pack thermal runaway control method

Abstract

The invention discloses a battery pack and a battery pack thermal runaway control method, and relates to the technical field of power batteries. The battery pack comprises a shell, a battery cell, a confluence pipeline, a first one-way valve, an air outlet device, a second one-way valve and a power device, the battery cell is arranged in the shell, and an anti-explosion valve is arranged on the battery cell. And the confluence pipeline is arranged in the shell, is communicated with the anti-explosion valve and is connected with the discharge port. The first one-way valve is arranged in the shell, and the flowing direction of the first one-way valve is from the anti-explosion valve to the confluence pipeline. The gas outlet device is arranged in the shell and located at the exhaust port, the gas outlet device is communicated with the confluence pipeline, and high-temperature gas exhausted during explosion of the anti-explosion valve enters the confluence pipeline through the first one-way valve and is exhausted out of the battery pack through the gas outlet device; the second one-way valve is used for preventing fluid outside the battery pack from entering the battery pack through the air outlet device. The power device is used for driving high-temperature gas in the confluence pipeline to move towards the gas outlet device.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a battery pack and a method for controlling thermal runaway of the battery pack. Background Art

[0002] The current new energy battery pack includes a large battery cell or multiple small battery cells arranged in combination. Due to the battery working environment requirements, the battery pack needs to seal the internal battery cells. For a single battery cell, the internal bare battery cell also needs to be sealed and protected. When the battery is working, due to various unforeseen working conditions or quality defects, the small battery cells inside the battery pack may thermally run away, the explosion-proof valve may burst, and the high-temperature gas inside the small battery cell may carry the internal substances of the battery cell out. Since the battery pack is in a sealed state, the high-temperature gas spreads in the internal space of the battery pack and cannot be dispersed in time, which may cause other battery cells to thermally run away, resulting in the risk of explosion and rapid fire of the entire battery pack. Summary of the invention

[0003] In view of this, the present invention provides a battery pack and a battery pack thermal runaway control method, which are used to solve the technical problem of high-temperature gas accumulation in the battery pack when the existing battery pack thermal runaways.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution:

[0005] A battery pack, comprising:

[0006] A housing, wherein a discharge port is provided on the housing;

[0007] A battery cell is arranged in the housing, and an explosion-proof valve is arranged on the battery cell;

[0008] A confluence pipeline is arranged in the shell, the confluence pipeline is communicated with the explosion-proof valve, and the confluence pipeline is connected to the discharge port;

[0009] A first one-way valve is disposed in the housing, wherein the flow direction of the first one-way valve is from the explosion-proof valve to the confluence pipeline;

[0010] a gas outlet device, disposed outside the housing and located at the discharge port, the gas outlet device being in communication with the confluence pipe, and high-temperature gas discharged when the explosion-proof valve explodes enters the confluence pipe through the first one-way valve and is discharged from the battery pack through the gas outlet device;

[0011] a second one-way valve, the second one-way valve being used to prevent fluid outside the battery pack from entering the battery pack through the gas outlet device; and

[0012] A power device is used to drive the high-temperature gas in the confluence pipeline to move toward the gas outlet device.

[0013] In some embodiments of the battery pack, the power device is disposed in the outer shell, and an inlet is opened on the outer shell, the inlet is connected to the outside of the battery pack, the power device is respectively connected to the inlet and the busbar, and the power device can introduce gas from the outside of the battery pack into the busbar through the inlet to drive the high-temperature gas to move toward the gas outlet device.

[0014] In some embodiments of the battery pack, the power device includes an intake pipe, a first power element and a third one-way valve, one end of the intake pipe is connected to the inlet port, and the other end is connected to the busbar, the first power element is arranged in the intake pipe, the third one-way valve is arranged in the intake pipe, and the flow direction of the third one-way valve is from the inlet port to the busbar.

[0015] In some embodiments of the battery pack, the first one-way valve is a solenoid valve or a mechanical valve;

[0016] The second one-way valve is a solenoid valve or a mechanical valve;

[0017] The third one-way valve is a solenoid valve or a mechanical valve;

[0018] The first power element is a fan.

[0019] In some embodiments of the battery pack, the gas outlet device includes a gas outlet pipe, the gas outlet pipe is located outside the shell, and the gas outlet pipe is connected to the busbar.

[0020] In some embodiments of the battery pack, the gas outlet device further includes a disposable valve, and the disposable valve is disposed at an end of the gas outlet pipe away from the discharge port.

[0021] In some embodiments of the battery pack, the power device further includes a second power element, the second power element is connected to the gas outlet device, and the second power element can drive the high-temperature gas to move toward the gas outlet device by exhausting air.

[0022] In some embodiments of the battery pack, the second power element is a vacuum pump or an exhaust fan.

[0023] In some embodiments of the battery pack, the battery cells include a plurality of battery cells, each of the battery cells is divided into two rows arranged at intervals, and the busbar is arranged between the two rows of the battery cells; the explosion-proof valve of each of the battery cells is respectively connected to the busbar, and the first one-way valve is respectively arranged between each of the battery cells and the busbar.

[0024] In some embodiments of the battery pack, the explosion-proof valve is connected to the bus line through a bus branch;

[0025] Alternatively, the explosion-proof valve is connected to the confluence pipeline via a sealing member.

[0026] In order to solve the above technical problems, the second technical solution adopted by the present invention is:

[0027] A battery pack thermal runaway control method is applied to the battery pack in the above embodiment, and the control method comprises the following steps:

[0028] Monitor the status of explosion-proof valves;

[0029] When the explosion-proof valve is opened, the high-temperature gas discharged when the explosion-proof valve explodes enters the busbar through the first one-way valve and is discharged from the battery pack through the gas outlet device; at the same time, the power device drives the high-temperature gas in the busbar to move toward the gas outlet device.

[0030] Implementing the embodiments of the present invention will have at least the following beneficial effects:

[0031] The above-mentioned battery pack has the technical effect of facilitating the discharge of high-temperature gas. Specifically, the explosion-proof valve of the battery cell is connected to the battery cell through a busbar, which can be used to collect the high-temperature gas of the battery cell. Then, under the action of the power device, the high-temperature gas in the busbar can be driven toward the gas outlet device, and finally the high-temperature gas is discharged through the gas outlet device. Thereby, the high-temperature gas will not be accumulated in the battery pack, which solves the technical problem of high-temperature gas accumulating in the battery pack when the existing battery pack has thermal runaway.

[0032] By setting a first one-way valve, the high-temperature gas entering the confluence pipeline is prevented from returning to the unexploded battery cells and causing a chain thermal runaway of other battery cells; by setting a second one-way valve, external gas or liquid is prevented from entering the battery pack through the gas outlet device.

[0033] The above-mentioned battery pack thermal runaway control method, by being applied to the battery pack in the above embodiment, can respond more quickly. When the explosion-proof valve is in an open state, it can be judged as a thermal runaway state, and the high-temperature gas will enter the conduit through the first one-way valve. At this time, the power device can be opened to move the high-temperature gas to the gas outlet device and discharge it through the gas outlet device. It can respond quickly and discharge the high-temperature gas in time, thereby solving the technical problem of high-temperature gas accumulating in the battery pack when the existing battery pack is thermally runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structural connection of a battery pack in one embodiment;

[0036] Figure 2 for Figure 1 Schematic diagram of the structure of the middle part of the battery cell;

[0037] Figure 3 for Figure 1 A simplified schematic diagram of the exhaust system;

[0038] Figure 4 is a schematic structural diagram of an air outlet device in one embodiment;

[0039] Figure 5 A schematic diagram of the structural connection relationship of the second one-way valve in one embodiment;

[0040] Figure 6 is a schematic diagram of the structure of a battery pack in one embodiment;

[0041] Figure 7 for Figure 6 A schematic diagram of the structure of part A in the middle;

[0042] Figure 8 Flow chart of a method for controlling thermal runaway of a battery pack in one embodiment.

[0043] in:

[0044] 1. Power device; 11. Air intake pipe; 12. Second power element; 13. Second one-way valve; 14. Independent power supply;

[0045] 2. air outlet device; 21. air outlet pipe; 211. first pipe; 212. second pipe; 22. third one-way valve;

[0046] 31. Converging pipeline; 32. First one-way valve; 33. Converging branch;

[0047] 4. Second one-way valve;

[0048] 100. casing; 1001. discharge port; 101. battery cell; 102. explosion-proof valve. DETAILED DESCRIPTION

[0049] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many other different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0050] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0052] In one embodiment of a battery pack, Figure 1-7 As shown, the battery pack includes a shell 100, a battery cell 101, a conduit 31, a first one-way valve 32, a gas outlet device 2, a second one-way valve 4 and a power device 1, and a discharge port 1001 is provided on the shell 100. The battery cell 101 is arranged in the shell 100, and an explosion-proof valve 102 is arranged on the battery cell 101. The conduit 31 is arranged in the shell, and the conduit 31 is connected to the explosion-proof valve 102, and the conduit 31 is connected to the discharge port 1001. The first one-way valve 32 is arranged in the shell, and the flow direction of the first one-way valve 32 is from the explosion-proof valve 102 to the conduit, and the first one-way valve 32 is used to prevent the high-temperature gas in the conduit 31 from entering the battery cell 101. The gas outlet device 2 is arranged outside the housing 100 and is located at the discharge port 1001. The gas outlet device 2 is connected to the confluence pipe 31. The high-temperature gas discharged when the explosion-proof valve 102 explodes enters the confluence pipe 31 through the first one-way valve 32 and is discharged from the battery pack through the gas outlet device 2. The second one-way valve 4 is used to prevent the fluid outside the battery pack from entering the battery pack through the gas outlet device 2. The power device 1 is used to drive the high-temperature gas in the confluence pipe 31 to move toward the gas outlet device 2.

[0053] In this embodiment, the explosion-proof valve 102 is connected via the busbar 31, which can be used to collect the high-temperature gas of the battery cell 101. Then, under the action of the power device 1, the high-temperature gas in the busbar 31 can be driven toward the gas outlet device 2, and finally discharged through the gas outlet device 2. This will not cause the high-temperature gas to accumulate in the battery pack, thereby solving the technical problem of high-temperature gas accumulating in the battery pack when the existing battery pack is thermally runaway.

[0054] It is understandable that the first one-way valve 32, the explosion-proof valve 102, and the second one-way valve 4 all have a sealing function. The explosion-proof valve 102 is a valve body structure provided on the battery cell 101, which can be a sheet-like structure. By providing notches on the sheet-like structure, the valve body structure becomes a weak point on the battery cell 101, so that the high-temperature gas generated during thermal runaway will break through the explosion-proof valve 102 and enter the confluence pipeline 31.

[0055] In addition, it should be noted that the position of the second one-way valve 4 is not fixed, and it can be set at the position of the discharge port 1001, on the gas outlet device 2, or on the conduit 31 to prevent gas from entering the battery pack.

[0056] In one embodiment of a battery pack, Figure 1 As shown, the power device 1 is arranged in the outer shell 100, and an inlet is opened on the outer shell 100, and the inlet is connected to the outside of the battery pack. The power device 1 is respectively connected to the inlet and the busbar 31. The power device 1 can introduce gas from the outside of the battery pack into the busbar 31 through the inlet to drive the high-temperature gas to move toward the outlet device 2.

[0057] In this embodiment, the power device 1 drives the high-temperature gas to move in a blowing manner, where gas is introduced from the outside to form an airflow, thereby driving the high-temperature gas to move.

[0058] In one embodiment of a battery pack, Figure 3 As shown, the power device 1 includes an intake pipe 11, a third one-way valve 13 and a first power element 12. One end of the intake pipe 11 is connected to the inlet port, and the other end is connected to the confluence line 31. The first power element 12 is arranged in the intake pipe 11, and the third one-way valve 13 is arranged in the intake pipe 11. The flow direction of the third one-way valve 13 is from the inlet port to the confluence line 31.

[0059] In this embodiment, when closed, the third one-way valve 13 can prevent gas from entering the battery pack from the inlet port, and is one-way, and can also prevent high-temperature gas from ejecting from the intake pipe 11 when the battery pack thermally runs away.

[0060] Specifically, in combination with the previous embodiment, the first one-way valve 32 may be a solenoid valve or a mechanical valve, etc. The mechanical valve may be, for example, a spring-type mechanical valve balanced by pressure, etc. A spring-type mechanical valve includes a valve body and an elastic member connected to the valve body, the elastic force of the elastic member keeps the valve body in a closed state, when the air pressure is greater than the elastic force of the elastic member, the valve body is opened, and when the air pressure is less than the elastic force of the elastic member, the valve body is automatically closed.

[0061] The second one-way valve 4 may also be a solenoid valve or the above-mentioned mechanical valve, etc. The third one-way valve 13 may also be a solenoid valve or the above-mentioned mechanical valve, etc.

[0062] The first power element 12 may be a fan or the like.

[0063] When the three one-way valves are solenoid valves, they can be started by setting a control system for unified control. When the three one-way valves are mechanical valves, since the invention is applied when the battery pack generates high-temperature gas due to thermal runaway, the internal air pressure increases at this time, and a pressure-balanced mechanical valve that opens when the pressure increases can be selected, and can also be restored when the pressure decreases, and can be used multiple times. In addition, preferably, since the third one-way valve 13 is away from the high-temperature gas, it is mainly used to draw air from the outside into the battery pack, and it is preferably a solenoid valve.

[0064] In one embodiment of a battery pack, Figure 3-6 As shown, the air outlet device 2 includes an air outlet pipe 21 . The air outlet pipe 21 is located outside the housing 100 . The air outlet pipe 21 is connected to the confluence pipe 31 .

[0065] In this embodiment, it should be noted that the air outlet pipe 21 and the exhaust port 1001 need to be sealed. The air outlet pipe 21 can be connected to the housing 100 through a mounting seat and other structures, and then sealed by a sealing ring.

[0066] In one embodiment of a battery pack, Figure 4 As shown, the gas outlet device 2 further includes a disposable valve 22, which is disposed at the end of the gas outlet pipe 21 away from the discharge port 1001. The gas outlet device 2 is provided with a disposable valve 22, and the structure of the disposable valve 22 can be the same as the principle of forming the explosion-proof valve 102, and is a sheet-like structural member. Similarly, the disposable valve 22 can further improve the sealing performance of the gas outlet pipe 21.

[0067] In an embodiment of a battery pack, the power device 1 may further include a second power element, which is connected to the gas outlet device 2 , and the second power element can drive the high-temperature gas to move toward the gas outlet device 2 by exhausting air.

[0068] In this embodiment, specifically, the second power element may be a vacuum device or an exhaust fan connected to the gas outlet device 2 . The activation of the second power element can suck out the high-temperature gas in the conduit 31 and discharge it outside the battery pack.

[0069] It should be noted that the first power element and the second power element can be used separately or in combination, which is more conducive to improving the discharge efficiency of high-temperature gas.

[0070] In an embodiment of the battery pack, an independent power source is further included, and the independent power source supplies power to the power device and / or each solenoid valve. The independent power source can be arranged inside the battery pack or outside the battery pack.

[0071] In one embodiment of a battery pack, Figure 4 As shown, the air outlet pipe 21 includes a first tube 211 and a second tube 212 that are detachably connected. The first tube 211 is connected to the discharge port 1001, and a disposable valve 22 is provided at the end of the second tube 212 away from the first tube 211 to further improve the sealing performance of the air outlet device and prevent external gas or liquid from entering the battery pack through the air outlet device.

[0072] In this embodiment, by arranging the first tube 211 and the second tube 212 to be detachable, the second tube 212 can be easily replaced, thereby replacing the disposable valve 22 in the second tube 212, which is convenient for mass production. Specifically, the detachable connection between the first tube 211 and the second tube 212 can be a threaded connection, and a sealing ring needs to be installed to achieve sealing.

[0073] Specifically, the first tube 211 can be fixed to the outer wall of the battery pack by means of bolts, screws, etc., and can also be sealed by a sealing ring.

[0074] In this embodiment, a second one-way valve 4 may be disposed between the discharge port 1001 and the first tube 211. Of course, the second one-way valve 4 may also be disposed in the first tube 211 or in the second tube 212.

[0075] In one embodiment of a battery pack, Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the battery cells 101 include a plurality of battery cells 101, each of which is divided into two rows arranged at intervals, and the busbar 31 is arranged between the two rows of battery cells 101. The explosion-proof valve 102 of each battery cell 101 is respectively connected to the busbar 31, and a first one-way valve 32 is respectively arranged between each battery cell 101 and the busbar 31. The first one-way valve 32 can prevent the high-temperature gas in the busbar 31 from returning to the battery cell 101, so that the high-temperature gas ejected from the exploded battery cell will not affect other battery cells.

[0076] In this embodiment, by dividing the battery cells 101 into two rows, the collecting pipe 31 can be made into a straight pipe structure with the shortest path and simple layout path, and the collecting pipe 31 can be arranged in the middle of the air intake device 1 and the air outlet device 2, which can better bear the blowing driving force of the air intake device 1, and further improve the efficiency of high-temperature gas discharge.

[0077] In an embodiment of a battery pack, the explosion-proof valve 102 is connected to the busbar line 31 via a busbar branch 33 .

[0078] refer to Figure 6 and Figure 7 In this embodiment, the explosion-proof valve 102 is arranged on the top surface and / or the bottom surface of the battery cell 101. At this time, the two are connected by a U-shaped bus branch 33. When connected by the U-shaped bus branch 33, two opposite battery cells 101 in the two rows can share a first one-way valve 32.

[0079] In another embodiment, the explosion-proof valve 102 is disposed on the side of the battery cell 101 close to the busbar 31, and the explosion-proof valve 102 is disposed opposite to the busbar 31. In this case, the explosion-proof valve 102 and the busbar 31 can be connected by a linear busbar 33. Figure 3 In the present embodiment, holes corresponding to the battery cells 101 are provided on the side of the confluence pipe 31 facing the explosion-proof valve 102 of the battery cell 101, and a first one-way valve 32 is provided in each hole.

[0080] When the explosion-proof valve 102 is disposed on the side of the battery cell 101 close to the busbar 31, the explosion-proof valve 102 can also be connected to the busbar 31 through a seal with a hollow structure. In a specific embodiment, the seal is disposed between the row of battery cells and the busbar 31, and the seal is provided with a hollow structure corresponding to each explosion-proof valve of each battery cell in a row of battery cells. In another specific embodiment, the seal is a separate seal, the number of seals is the same as the number of battery cells, and each seal is respectively disposed between the explosion-proof valve of each battery cell and the busbar 31.

[0081] The battery pack of the present invention can be applied to new energy vehicles. A gas exhaust pipe can be added to the new energy vehicle. The gas exhaust pipe 21 of the gas outlet device 2 is connected to the gas exhaust pipe, which is used to discharge the high-temperature gas generated by thermal runaway toward the rear of the vehicle.

[0082] The present invention also relates to a method for controlling thermal runaway of a battery pack, such as Figure 8 As shown, the control method applied to the battery pack in the previous embodiment includes the following steps:

[0083] S10 , monitoring the status of the explosion-proof valve 102 .

[0084] S20. When the explosion-proof valve 102 is opened, the high-temperature gas discharged when the explosion-proof valve 102 explodes enters the confluence pipe 32 through the first one-way valve 31 and is discharged from the battery pack through the gas outlet device 2. At the same time, the power device 1 drives the high-temperature gas in the confluence pipe 32 to move toward the gas outlet device 2.

[0085] The control method of this embodiment can respond more quickly. When the explosion-proof valve 102 is in the open state, it can be judged as a thermal runaway state. The high-temperature gas will enter the conduit 31 through the first one-way valve 31. At this time, the power device 1 can be opened to discharge the high-temperature gas. It can respond quickly and discharge the high-temperature gas in time, thereby solving the technical problem of high-temperature gas accumulating in the battery pack when the existing battery pack is in thermal runaway.

[0086] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery pack, characterized in that: The battery pack comprises: A housing, wherein a discharge port is provided on the housing; A battery cell is arranged in the housing, and an explosion-proof valve is arranged on the battery cell; A confluence pipeline is arranged in the shell, the confluence pipeline is communicated with the explosion-proof valve, and the confluence pipeline is connected to the discharge port; A first one-way valve is disposed in the housing, wherein the flow direction of the first one-way valve is from the explosion-proof valve to the confluence pipeline; a gas outlet device, disposed outside the housing and located at the discharge port, the gas outlet device being in communication with the confluence pipe, and high-temperature gas discharged when the explosion-proof valve explodes enters the confluence pipe through the first one-way valve and is discharged from the battery pack through the gas outlet device; a second one-way valve, the second one-way valve being used to prevent fluid outside the battery pack from entering the battery pack through the gas outlet device; and A power device is used to drive the high-temperature gas in the confluence pipeline to move toward the gas outlet device.

2. The battery pack according to claim 1, wherein: The power device is arranged in the outer shell, and an inlet is opened on the outer shell. The inlet is connected to the outside of the battery pack. The power device is respectively connected to the inlet and the busbar. The power device can introduce gas from the outside of the battery pack into the busbar through the inlet to drive the high-temperature gas to move toward the gas outlet device.

3. The battery pack according to claim 2, characterized in that: The power device includes an intake pipe, a first power element and a third one-way valve. One end of the intake pipe is connected to the inlet port, and the other end is connected to the confluence line. The first power element is arranged in the intake pipe, and the third one-way valve is arranged in the intake pipe. The flow direction of the third one-way valve is from the inlet port to the confluence line.

4. The battery pack according to claim 3, characterized in that: The first power element is a fan.

5. The battery pack according to claim 1, wherein: The air outlet device comprises an air outlet pipe, the air outlet pipe is located outside the shell, and the air outlet pipe is connected with the confluence pipeline.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The power device further includes a second power element, which is connected to the gas outlet device, and the second power element can drive the high-temperature gas to move toward the gas outlet device by exhausting air.

7. The battery pack according to claim 6, characterized in that: The second power element is a vacuum pump or an exhaust fan.

8. The battery pack according to claim 1, wherein: The battery cells include a plurality of battery cells, each of which is divided into two rows arranged at intervals, and the busbar is arranged between the two rows of battery cells; the explosion-proof valve of each battery cell is respectively connected to the busbar, and the first one-way valve is respectively arranged between each battery cell and the busbar.

9. The battery pack according to claim 8, characterized in that: The explosion-proof valve is connected to the confluence pipeline via a confluence branch; Alternatively, the explosion-proof valve is connected to the confluence pipeline via a sealing member.

10. A method for controlling thermal runaway of a battery pack, characterized in that: Applied to the battery pack according to any one of claims 1 to 9, the control method comprises the following steps: Monitor the status of explosion-proof valves; When the explosion-proof valve is opened, the high-temperature gas discharged when the explosion-proof valve explodes enters the busbar through the first one-way valve and is discharged from the battery pack through the gas outlet device; at the same time, the power device drives the high-temperature gas in the busbar to move toward the gas outlet device.

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