Battery pack

Abstract

The application provides a battery pack, comprising: a box body; a tray; a battery module comprising a plurality of battery cells, wherein a battery cell explosion-proof valve is arranged on each battery cell, and the battery cell explosion-proof valve is located on a side of the battery cell away from the tray; a fire extinguishing plate located above the battery module; any one set of oppositely arranged frames in the tray frame is defined as a first frame, a cavity in the first frame forms a first smoke exhaust channel, any one set of oppositely arranged side plates in the box side plate is defined as a first side plate, the first side plate is adjacent to the first frame, a cavity in the first side plate forms a second smoke exhaust channel, the first smoke exhaust channel and the second smoke exhaust channel are communicated, and the second smoke exhaust channel is communicated with the outside; by making the battery cell explosion-proof valve upward and utilizing the cavities in the tray frame and the box side plate to form the smoke exhaust channel, high-temperature smoke can be exhausted, and the fire extinguishing plate arranged above the battery module can effectively reduce the spread of thermal runaway and high-temperature smoke.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a battery pack. Background Technology

[0002] Currently, thermal runaway issues in battery modules are frequent. In most related technologies, thermal runaway protection mechanisms involve placing the cell explosion-proof valves downwards and positioning the positive and negative terminals of the cells upwards. The battery casing sidewalls are welded with cell base plates and casing base plates with circular openings. These base plates, along with the casing sidewalls, form a sealed exhaust channel, allowing thermal runaway fumes to escape through the explosion-proof valves on the casing walls.

[0003] However, on the one hand, the battery module will sag under gravity. This reduces the clearance between the cell base plate and the exhaust channel of the casing (especially in the central area of ​​the module), hindering smoke exhaust and affecting the effectiveness of thermal runaway protection. On the other hand, since the battery module is installed behind the battery casing, the airtightness of the exhaust channel cannot be detected. If there is a localized leak, high-temperature smoke will escape from the leak during thermal runaway, reducing the amount discharged from the explosion-proof valve and leading to failure or reduced effectiveness of the thermal runaway protection. Furthermore, because this thermal runaway protection is passive, it is highly susceptible to the spread of thermal runaway from the cells, potentially causing the entire battery module to catch fire and explode.

[0004] In summary, this application provides a battery pack to address the issues of smoke exhaust and thermal runaway propagation in the thermal runaway protection of battery modules. Summary of the Invention

[0005] The embodiments of the present invention provide a battery pack that can improve the technical problems of smoke exhaust and thermal runaway propagation in the thermal runaway protection of battery modules.

[0006] An embodiment of the present invention provides a box body, including a box bottom plate and a box side plate connected to the box bottom plate and arranged circumferentially around the box bottom plate, wherein the box bottom plate and the box side plate form a first receiving cavity;

[0007] A tray is located within the first receiving cavity. The tray includes a tray base plate and a tray frame connected to the tray base plate and arranged circumferentially around the tray base plate. The tray base plate and the tray frame form a second receiving cavity.

[0008] A battery module is located in the second receiving cavity. The battery module includes multiple battery cells, and each battery cell is provided with a cell explosion-proof valve located on the side of the battery cell away from the tray.

[0009] A fire extinguishing plate is located above the battery module;

[0010] Wherein, any set of oppositely arranged frames in the pallet frame is defined as the first frame, and the cavity in the first frame forms the first smoke exhaust channel. Any set of oppositely arranged side panels in the box side panels is defined as the first side panel. The first side panel is adjacent to the first frame, and the cavity in the first side panel forms the second smoke exhaust channel. The first smoke exhaust channel is connected to the second smoke exhaust channel, and the second smoke exhaust channel is connected to the outside.

[0011] In one embodiment, the positive and negative terminals of the battery cell are on the same side, the positive and negative terminals of the battery cell and the explosion-proof valve of the battery cell are on opposite sides, and the battery cell is inverted so that the explosion-proof valve of the battery cell faces upwards towards the battery module.

[0012] In one embodiment, the battery module includes a cell mounting frame with a through third receiving cavity, the cell being located within the cell mounting frame and exposing the cell explosion-proof valve.

[0013] In one embodiment, on the end face of the battery cell mounting frame on the same side as the battery cell explosion-proof valve, there is a pair of oppositely arranged smoke exhaust grooves. The smoke exhaust grooves in the same column or / and the same row are interconnected to form a third smoke exhaust channel, which is connected to the first smoke exhaust channel.

[0014] In one embodiment, a first through hole is provided at the top of the first frame, one end of the first through hole is connected to the smoke exhaust groove, and the other end of the first through hole is connected to the first smoke exhaust channel, that is, the third smoke exhaust channel is connected to the first smoke exhaust channel through the first through hole.

[0015] In one embodiment, a second through hole is provided at the bottom of the first frame, and a third through hole is provided on the first side plate opposite to the second through hole. The second through hole and the third through hole are connected to form a flue gas outlet, and the first exhaust channel and the second exhaust channel are connected through the flue gas outlet.

[0016] In one embodiment, the bottom surface of the first frame is provided with a mounting groove surrounding the second through hole, and a sealing element is provided in the mounting groove, the sealing element being located between the second through hole and the third through hole.

[0017] In one embodiment, an explosion-proof valve for the enclosure is provided on the first side plate, and the second smoke exhaust channel is connected to the outside through the explosion-proof valve for the enclosure.

[0018] In one embodiment, the fire extinguishing plate has a fire extinguishing agent holding hole on the side facing the battery module. The fire extinguishing agent holding hole is aligned with the cell explosion-proof valve. The fire extinguishing agent is placed in the fire extinguishing agent holding hole and the fire extinguishing agent holding hole is sealed by a hot melt film.

[0019] In one embodiment, structural adhesive is provided on the side of the fire extinguishing plate facing the battery module and on the flat surface where no fire extinguishing agent is provided. The fire extinguishing plate is attached to the top surface of the cell mounting frame and the top surface of the tray frame through the structural adhesive.

[0020] The beneficial effects of the embodiments of the present invention are as follows: This application provides a battery pack, including: a housing; a tray; a battery module including multiple battery cells, each battery cell having an explosion-proof valve located on the side of the battery cell away from the tray; a fire extinguishing plate located above the battery module; any set of oppositely arranged frames in the tray frame is defined as a first frame, the cavity within the first frame forms a first smoke exhaust channel, any set of oppositely arranged side plates in the housing side plates is defined as a first side plate, the first side plate is adjacent to the first frame, the cavity within the first side plate forms a second smoke exhaust channel, the first smoke exhaust channel communicates with the second smoke exhaust channel, and the second smoke exhaust channel communicates with the outside; by making the battery cell explosion-proof valves face upwards and utilizing the cavities within the tray frame and the housing side plates to form smoke exhaust channels, high-temperature smoke can be discharged, and a fire extinguishing plate is provided above the battery module, which can effectively reduce the spread of thermal runaway and high-temperature smoke. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1A This is a schematic diagram of the battery pack structure provided in the embodiments of this application;

[0023] Figure 1B This is an exploded three-dimensional view of the battery pack provided in the embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the battery module and tray provided in the embodiments of this application;

[0025] Figure 3 This is a partial schematic diagram of the smoke exhaust channel inside the pallet frame and box side panel provided in the embodiments of this application;

[0026] Figure 4 This is a schematic diagram of the structure of the fire extinguishing plate provided in the embodiments of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features.

[0029] like Figures 1A to 4 As shown, this application provides a battery pack 100, including a housing 10, including a bottom plate and a side plate 11 connected to the bottom plate and arranged circumferentially around the bottom plate, the bottom plate and the side plate 11 forming a first receiving cavity; a tray 12 located in the first receiving cavity, the tray 12 including a tray bottom plate and a tray frame 13 connected to the tray bottom plate and arranged circumferentially around the tray bottom plate, the tray bottom plate and the tray frame 13 forming a second receiving cavity; a battery module 20 located in the second receiving cavity, the battery module 20 including a plurality of battery cells 21, each battery cell 21 being provided with a cell explosion-proof valve 211, the cell explosion-proof valve 211 being located on the battery cell 21. On the side away from the tray 12, that is, above the battery cell 21 module, the cell explosion-proof valve 211 is located; the fire extinguishing plate 30 is located above the battery module 20; wherein, any set of oppositely arranged frames in the tray frame 13 is defined as the first frame 131, the cavity in the first frame 131 forms the first smoke exhaust channel 41, any set of oppositely arranged side plates in the box side plates 11 is defined as the first side plate 111, the first side plate 111 is adjacent to the first frame 131, the cavity in the first side plate 111 forms the second smoke exhaust channel 42, the first smoke exhaust channel 41 and the second smoke exhaust channel 42 are connected, and the second smoke exhaust channel 42 is connected to the outside.

[0030] It should be noted that the multiple battery cells 21 are arranged in an array along a first direction and a second direction. Specifically, the first direction is... Figure 1B The middle X-axis direction, the second direction is Figure 1B In the Y-axis direction.

[0031] It should be noted that the cell explosion-proof valve 211 can be formed by stamping grooves or thinning at least part of the outer shell of the cell 21, and the cell explosion-proof valve 211 can also be an explosion-proof membrane structure. This application does not make specific limitations on this.

[0032] It should be noted that the tray 12 is fixedly connected to the box body 10 by bolts. In other embodiments, the tray 12 may also be fixedly connected to the box body 10 by snap-fit ​​or other means, and this application does not specifically limit this.

[0033] For example, in this embodiment, the first side panel 111 and the first frame 131 extend along a first direction. The tray frame 13 further includes a second frame 132 adjacent to the first frame 131, and the box side panel 11 further includes a second side panel 112 adjacent to the first side panel 111. The second side panel 112 and the second frame 132 are disposed adjacent to each other and extend along a second direction. Optionally, the second frame 132 can serve as a liquid cooling plate for the battery module 20, and coolant flows within the cavity of the second frame 132. Optionally, the second frame 132 has the same structure as the first frame 131, the first smoke exhaust channel 41 is disposed within the second frame 132, the second smoke exhaust channel 42 is disposed within the second side panel 112, and the first smoke exhaust channel 41 and the second smoke exhaust channel 42 are connected.

[0034] This application achieves the discharge of high-temperature smoke by setting the cell explosion-proof valve 211 upward and utilizing the cavities within the tray frame 13 and the box side panel 11 to form a smoke exhaust channel. Compared with the thermal runaway protection scheme in related technologies where the cell explosion-proof valve is located below the battery module and a smoke exhaust channel is designed below the battery module, this application can directly utilize the cavities within the tray frame 13 and the box side panel 11 to form a smoke exhaust channel, eliminating the need for an additional smoke exhaust channel, thus simplifying the design of the box 10 and reducing its weight and cost. Furthermore, the smoke exhaust channel in this application is not affected by the gravity of the battery module 20, and airtightness testing is convenient. In addition, this application effectively reduces the spread of thermal runaway and high-temperature smoke by setting an active fire extinguishing device 30 above the battery module 20, preventing the battery pack 100 from catching fire and exploding.

[0035] In related technologies, the positive and negative terminals of the battery cell can be set on the same side as the battery cell explosion-proof valve. However, since high-voltage connectors are connected to the positive and negative terminals of the battery cell, when the battery cell experiences thermal runaway, the battery cell explosion-proof valve opens, and the ejected high-temperature and high-pressure gas flow may damage the insulation layer of the high-voltage connector, thereby causing the high-voltage insulation of the system to fail and generating safety accidents such as electric arcs and sparks.

[0036] In this embodiment, the positive and negative terminals of the battery cell 21 are on the same side, and the positive and negative terminals of the battery cell 21 and the battery cell explosion-proof valve 211 are on opposite sides. In order to make the battery cell explosion-proof valve 211 face the top of the battery module 20, the battery cell 21 is inverted.

[0037] It should be noted that the positive and negative terminals of the battery cell 21 are connected by a CCS assembly (not shown in the figure) disposed between the battery cell 21 and the tray 12. The connection method between the battery cell 21 and the CCS assembly includes, but is not limited to, laser welding or other contact connection methods that do not require welding. This application does not make specific limitations on this.

[0038] like Figure 2 As shown, in this embodiment, the battery module 20 includes a cell mounting frame 22, which has a through-hole third receiving cavity. The cell 21 is located within the cell mounting frame 22 and exposes the cell explosion-proof valve 211, so that the explosion-proof valve can function normally in the event of thermal runaway of the cell 21. Specifically, multiple cell mounting frames 22 are arranged in an array along a first direction and a second direction, and each cell 21 corresponds to one cell mounting frame 22.

[0039] like Figure 2 and Figure 3 As shown, in this embodiment, on the end face of the battery cell mounting frame 22 on the same side as the battery cell explosion-proof valve 211, there is a pair of oppositely arranged smoke exhaust channels 221. Optionally, the line connecting the smoke exhaust channels 221 crosses the center of the battery cell explosion-proof valve 211, and the smoke exhaust channels 221 in the same column are interconnected to form a third smoke exhaust channel 43. The third smoke exhaust channel 43 is connected to the first smoke exhaust channel 41. Specifically, the third smoke exhaust channel 43 is arranged along the first direction and extends along the second direction. The third smoke exhaust channel 43 intersects with the first smoke exhaust channel 41, and both ends of each third smoke exhaust channel 43 are respectively connected to a first smoke exhaust channel 41.

[0040] In other embodiments, the first smoke exhaust channel 41 is located in the second frame 132 and extends along the second direction. In this embodiment, the line connecting the smoke exhaust grooves 221 crosses the center of the battery cell explosion-proof valve 211, and the smoke exhaust grooves 221 in the same row are interconnected to form a third smoke exhaust channel 43, which is connected to the first smoke exhaust channel 41. Specifically, the third smoke exhaust channels 43 are arranged along the second direction and extend along the first direction, intersecting with the first smoke exhaust channels 41, and each end of the third smoke exhaust channel 43 is connected to a first smoke exhaust channel 41. Further, in this embodiment, the second smoke exhaust channel 42 is disposed within the second side plate 112 so that the first smoke exhaust channel 41 and the second smoke exhaust channel 42 are connected.

[0041] In other embodiments, a first smoke exhaust channel 41 is provided within both the first frame 131 and the second frame 132. The first smoke exhaust channel 41 within the first frame 131 extends along a first direction, and the first smoke exhaust channel 41 within the second frame 132 extends along a second direction. In this embodiment, the line connecting the smoke exhaust troughs 221 crosses the center of the battery cell explosion-proof valve 211. The smoke exhaust troughs 221 in the same row and column are interconnected to form a third smoke exhaust channel 43, which is connected to the first smoke exhaust channel 41. Specifically, the third smoke exhaust channel 43 extends along the first direction and the second direction. The third smoke exhaust channel 43 extending along the first direction intersects with the first smoke exhaust channel 41 extending along the second direction; the third smoke exhaust channel 43 extending along the second direction intersects with the first smoke exhaust channel 41 extending along the first direction. Each end of the third smoke exhaust channel 43 is connected to a first smoke exhaust channel 41. Furthermore, in this embodiment, both the first side plate 111 and the second side plate 112 are provided with a second smoke exhaust channel 42. The first smoke exhaust channel 41 located in the first frame 131 is connected to the second smoke exhaust channel 42 located in the first side plate 111; the first smoke exhaust channel 41 located in the second frame 132 is connected to the second smoke exhaust channel 42 located in the second side plate 112. However, since the third smoke exhaust channel 43 in this embodiment is crisscrossed, its smoke exhaust channel path is complex compared to the unidirectional third smoke exhaust channel 43 in the above embodiments, and smoke is prone to stagnation in the third smoke exhaust channel 43.

[0042] like Figure 2 and Figure 3 As shown, in this embodiment, a first through hole 14 is provided at the top of the first frame 131. One end of the first through hole 14 is connected to the smoke exhaust groove 221, and the other end of the first through hole 14 is connected to the first smoke exhaust channel 41. That is, the third smoke exhaust channel 43 is connected to the first smoke exhaust channel 41 through the first through hole 14. The first through hole 14 forms a smoke inlet, and a smoke inlet is provided at the end of each column of the third smoke exhaust channel 43.

[0043] For example, when a cell 21 in the battery module 20 experiences thermal runaway, the cell explosion-proof valve 211 of the cell 21 ejects high-temperature and high-pressure smoke. The smoke flows to both sides along the third exhaust channel 43 where the cell explosion-proof valve 211 is located, passes through the smoke inlet on the first frame 131, and flows into the first exhaust channel 41 inside the first frame 131.

[0044] Furthermore, in this embodiment, a second through hole 15 is provided at the bottom of the first frame 131, and a third through hole 16 is provided on the first side plate 111 opposite to the second through hole 15. The second through hole 15 and the third through hole 16 are connected to form a flue gas outlet 17. The second exhaust channel 42 and the third exhaust channel 43 are connected through the flue gas outlet 17, so that the flue gas entering the first exhaust channel 41 enters the second exhaust channel 42 through the flue gas outlet 17.

[0045] It should be noted that at least one flue gas outlet 17 is provided on the first frame 131 and the first side plate 111 on one side. Optionally, the flue gas outlet 17 is located in the middle of the first frame 131 and the first side plate 111. However, this application does not specifically limit the position of the flue gas outlet 17. In other embodiments, the first flue gas outlet 17 can be located at any position in the extending direction of the first frame 131 and the first side plate 111.

[0046] like Figure 3 As shown, in this embodiment, the first side plate 111 includes a main body and a stepped portion. The main body forms the outer frame of the housing 10, and the stepped portion is located on the inner wall of the main body facing the battery module 20. The first side plate 111 overlaps the stepped portion, so that the stepped portion supports the bottom of the first frame 131. The first frame 131 is away from the outer wall of the battery module 20 and contacts the main body. Specifically, the inner cavity of the stepped portion forms a second smoke exhaust channel 42, and the third through hole 16 is located at the top of the stepped portion.

[0047] like Figure 3 As shown, in order to ensure the airtightness of the flue gas passage in this embodiment, the bottom surface of the first frame 131 is provided with an installation groove surrounding the second through hole 15, and a sealing member 18 is provided in the installation groove. The sealing member 18 is located between the second through hole 15 and the third through hole 16.

[0048] It should be noted that the seal 18 is made of an acid and alkali resistant and high temperature resistant elastic material. For example, the material of the seal 18 is selected from one of silicone rubber, EPDM rubber, fluororubber, nitrile rubber or hydrogenated nitrile rubber. This application does not make any specific limitation in this regard.

[0049] Furthermore, in this embodiment, the first side plate 111 is provided with a box explosion-proof valve, and the second smoke exhaust channel 42 is connected to the outside through the box explosion-proof valve.

[0050] like Figure 4As shown, in this embodiment, the fire extinguishing plate 30 has a fire extinguishing agent holding hole 31 on the side facing the battery module 20. The fire extinguishing agent holding hole 31 is aligned with the cell explosion-proof valve 211. Fire extinguishing agent is placed in the fire extinguishing agent holding hole 31, and the fire extinguishing agent holding hole 31 is sealed by a hot-melt film 32. Optionally, the fire extinguishing agent holding hole 31 corresponds one-to-one with the cell explosion-proof valve 211. Optionally, the gap between the hot-melt film 32 and the cell explosion-proof valve 211 is 0.5mm to 1mm.

[0051] When a cell 21 in the battery module 20 experiences thermal runaway, the cell explosion-proof valve 211 on the thermally runaway cell 21 ejects high-temperature fumes, melting the hot melt diaphragm 32. The extinguishing agent at the top of the cell explosion-proof valve 211 reacts immediately, ejecting aerosol substances to reduce the oxygen concentration, absorb a large amount of high-temperature fumes, prevent the thermal runaway of cell 21 from continuing, and also prevent the heat from spreading to adjacent cells 21. The small amount of cooled fumes flows to both sides through the third exhaust channel 43 where cell 21 is located, enters the first exhaust channel 41 located inside the first frame 131 through the fumes inlet at the top of the first frame 131, and then enters the second exhaust channel 42 located inside the first side plate 111 through the fumes outlet 17 located at the bottom of the first frame 131. Finally, a small amount of low-temperature fumes are discharged from the explosion-proof valve of the housing 10.

[0052] In this embodiment, structural adhesive is provided on the side of the fire extinguishing plate 30 facing the battery module 20, on the flat surface where no fire extinguishing agent is provided. The fire extinguishing plate 30 is attached to the top surface of the battery cell mounting frame 22 and the top surface of the tray frame 13 through the structural adhesive. While fixing the fire extinguishing plate 30, the fire extinguishing plate 30 covers the third smoke exhaust channel 43 and the smoke inlet, forming a completely closed smoke channel, further ensuring the airtightness of the smoke channel and preventing smoke leakage.

[0053] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery pack, characterized in that, include The box body includes a bottom plate and side plates connected to the bottom plate and arranged circumferentially around the bottom plate, wherein the bottom plate and the side plates form a first receiving cavity; A tray is located within the first receiving cavity. The tray includes a tray base plate and a tray frame connected to the tray base plate and arranged circumferentially around the tray base plate. The tray base plate and the tray frame form a second receiving cavity. A battery module is located in the second receiving cavity. The battery module includes a cell mounting frame and a plurality of cells. A third receiving cavity is provided through the cell mounting frame. A cell explosion-proof valve is provided on the cell. The cell explosion-proof valve is located on the side of the cell away from the tray. The cell is located in the cell mounting frame and the cell explosion-proof valve is exposed. A fire extinguishing plate is located above the battery module; Wherein, any set of oppositely arranged frames in the pallet frame is defined as the first frame, the cavity in the first frame forms the first smoke exhaust channel, any set of oppositely arranged side panels in the box side panels is defined as the first side panel, the first side panel is adjacent to the first frame, the cavity in the first side panel forms the second smoke exhaust channel, the first smoke exhaust channel is connected to the second smoke exhaust channel, and the second smoke exhaust channel is connected to the outside. On the end face of the battery cell mounting frame on the same side as the battery cell explosion-proof valve, there is a pair of oppositely arranged smoke exhaust grooves. The smoke exhaust grooves in the same column or / and the same row are interconnected to form a third smoke exhaust channel, which is connected to the first smoke exhaust channel.

2. The battery pack as described in claim 1, characterized in that, The positive and negative terminals of the battery cell are on the same side, while the positive and negative terminals of the battery cell and the explosion-proof valve of the battery cell are on opposite sides. The battery cell is inverted so that the explosion-proof valve of the battery cell faces upwards towards the battery module.

3. The battery pack as described in claim 1, characterized in that, The top of the first frame is provided with a first through hole. One end of the first through hole is connected to the smoke exhaust groove, and the other end of the first through hole is connected to the first smoke exhaust channel. That is, the third smoke exhaust channel is connected to the first smoke exhaust channel through the first through hole.

4. The battery pack as described in claim 1, characterized in that, The bottom of the first frame is provided with a second through hole, and the first side plate is provided with a third through hole opposite to the second through hole. The second through hole and the third through hole are connected to form a flue gas outlet, and the first exhaust channel and the second exhaust channel are connected through the flue gas outlet.

5. The battery pack as described in claim 4, characterized in that, The bottom surface of the first frame is provided with a mounting groove surrounding the second through hole, and a sealing element is provided in the mounting groove, the sealing element being located between the second through hole and the third through hole.

6. The battery pack as described in claim 1, characterized in that, An explosion-proof valve for the enclosure is provided on the first side plate, and the second smoke exhaust channel is connected to the outside through the explosion-proof valve for the enclosure.

7. The battery pack as described in claim 1, characterized in that, The fire extinguishing plate has a fire extinguishing agent holding hole on the side facing the battery module. The fire extinguishing agent holding hole is aligned with the battery cell explosion-proof valve. The fire extinguishing agent is placed in the fire extinguishing agent holding hole and the fire extinguishing agent holding hole is sealed by a hot melt film.

8. The battery pack as described in claim 7, characterized in that, On the side of the fire extinguishing plate facing the battery module, where no fire extinguishing agent is provided, structural adhesive is provided. The fire extinguishing plate is attached to the top surface of the cell mounting frame and the top surface of the tray frame through the structural adhesive.

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