Battery module and battery pack

Abstract

The utility model relates to soft package electric core technical field discloses a battery module and battery package, and the battery module includes: electric core unit, circuit board and first protection subassembly, and the first end of electric core unit forms the pole lug along the third direction, and the circuit board is opposite to the first end of electric core unit along the third direction and is established, and the notch is set up on the circuit board to make the circuit board form two installation edge parts along the opposite two sides of the notch in the first direction, and the first protection subassembly is clamped on the installation edge part, and the limiting hole is formed on the first protection subassembly, and the pole lug passes through the limiting hole and is connected with the circuit board electricity. The utility model discloses the pole lug from the first protection subassembly and is connected with the circuit board, and the notch of the circuit board is sealed by the first protection subassembly, realizes the thermal electricity separation of battery module, and the safety performance of battery module is improved, and, the manual installation is convenient, and is convenient to replace.

Description

Technical Field

[0001] This utility model relates to the field of soft-pack battery technology, specifically to battery modules and battery packs. Background Technology

[0002] Lithium-ion batteries used in electric bicycles may experience thermal runaway under conditions such as overcharging, over-discharging, internal short circuits, or external impacts. This means that the internal temperature of the battery rises rapidly, triggering a chain reaction that can lead to battery fire or explosion, endangering personal safety and property. Currently, the thermal runaway problem of lithium-ion batteries has become one of the key factors restricting their widespread application in the electric bicycle industry.

[0003] Existing electric bicycle battery packs often neglect the need for thermal-electric separation in their design, increasing the risk of heat spread and resulting in lower safety performance. Utility Model Content

[0004] In view of this, the present invention provides a battery module and battery pack to solve the problem that electric bicycle battery packs neglect the need for thermoelectric separation and have low safety performance.

[0005] In a first aspect, this utility model provides a battery module having a first direction, a second direction, and a third direction that intersect each other, including: a battery cell unit, a circuit board, and a first protective component. The battery cell unit has a tab formed at its first end along the third direction. The circuit board is disposed opposite to the first end of the battery cell unit along the third direction. The circuit board has a notch so that the circuit board forms two mounting edges on opposite sides of the notch along the first direction. The first protective component is snapped onto the mounting edges. The first protective component has a limiting hole formed on it. The first protective component is disposed in a one-to-one correspondence with the tab. The tab passes through the limiting hole and is connected to the circuit board.

[0006] Beneficial effects: The tabs extend from the first protective component and connect to the circuit board. By using the first protective component to seal the gap in the circuit board, thermal and electrical separation of the battery module is achieved, improving the safety performance of the battery module. Furthermore, the first protective component and the circuit board are detachably snapped together, which facilitates manual installation and replacement.

[0007] In one optional embodiment, the first protective component includes a snap-fit ​​portion and a connecting portion. There are two snap-fit ​​portions, which are spaced apart and are snap-fitted into two mounting edges in a one-to-one correspondence. The connecting portion is disposed between the two snap-fit ​​portions and is connected to both snap-fit ​​portions to form the limiting hole.

[0008] Beneficial effects: The connecting part and the snap-fit ​​part are connected to form the first protective component. The structure is simple and the position of the connecting part can be adjusted according to the width of the electrode tab, which improves the applicability of the first protective component.

[0009] In one optional embodiment, the connecting portion includes connectors, two of which are spaced apart along a second direction, and the two connectors and the two snap-fit ​​portions surround to form the limiting hole.

[0010] Beneficial effects: The connection part and the snap-fit ​​part are integrally molded, which increases the structural strength and improves the structural reliability.

[0011] In one optional embodiment, a plurality of battery cells are provided, and the plurality of battery cells are arranged along a first direction. The battery module further includes a first fireproof component, a second fireproof component, and a second protective component. The first fireproof component and the second fireproof component are respectively disposed on opposite sides of the battery cell along the second direction and are disposed near the first end of the battery cell. The second protective component is disposed between two adjacent battery cells. The first fireproof component, the second fireproof component, the circuit board, the first protective component, and the two second protective components enclose a closed cavity.

[0012] Beneficial effects: The closed cavity formed by the first fireproof component, the second fireproof component, the second protective component of the circuit board and the first protective component isolates the high-temperature gas generated during thermal runaway, reduces the occurrence of heat propagation, and improves the safety performance of the battery module.

[0013] In one alternative embodiment, a weak area is formed on the first fireproof component, the weak area being adapted to be opened by gas to open the sealed cavity.

[0014] Beneficial effect: When thermal runaway occurs in the battery cell, the generated high-temperature gas breaks through the weak area and exhausts outward, preventing excessive pressure in the sealed cavity from causing an explosion.

[0015] In one optional embodiment, the first fireproof component includes a first fireproof structure and a second fireproof structure. The first fireproof structure is connected to the battery cell and the second fireproof structure on both sides along the second direction, respectively. A first opening is formed on the first fireproof structure, and the weak area is formed on the second fireproof structure. The first opening is connected to the closed cavity, and the orthographic projection of the weak area along the second direction onto the first fireproof structure at least partially covers the first opening.

[0016] Beneficial effects: The second fireproof structure is located on the side of the first fireproof structure away from the cell unit, and the weak area along the second direction projects onto the first fireproof structure in at least part of the first opening. This can ensure that the high-temperature gas generated by thermal runaway is normally exhausted from the inside to the outside, while preventing gas from entering the closed cavity of the cell unit that has not experienced thermal runaway from the outside to the inside. This achieves isolation and sealing between cell units, reduces the occurrence of heat spread, and improves the safety performance of the battery module.

[0017] In one optional embodiment, the battery module further includes a third fireproof component, at least one of which is provided and covers at least one of the two adjacent battery cells. The third fireproof component has a second opening formed on it, which is located on the same side as the first opening.

[0018] Beneficial effects: The third fireproof component further improves the heat insulation capability of the battery cell, preventing the thermal runaway battery cell from rapidly conducting heat to adjacent battery cells and avoiding heat diffusion.

[0019] In one alternative embodiment, the battery module further includes a fourth fireproof component disposed on the side of the circuit board away from the first end of the battery cell.

[0020] Beneficial effects: The fourth fireproof component achieves thermal isolation between the battery cell unit and the circuit board, further improving the thermal and electrical separation capability of the battery module and preventing the high-temperature gas generated by the thermal runaway battery cell from having a negative impact on the electrical connection.

[0021] Secondly, the present invention also provides a battery pack, including the aforementioned battery module and housing; a receiving cavity is formed inside the housing, and the battery module is disposed within the receiving cavity.

[0022] In one optional embodiment, an exhaust chamber is further formed inside the housing, the exhaust chamber is disposed on the side of the housing and communicates with the receiving cavity, and an explosion-proof valve is provided on the housing and communicates with the exhaust chamber.

[0023] Beneficial effects: Using the side of the enclosure for exhaust keeps high-temperature gas away from the integrated busbar and increases the utilization rate of the side of the enclosure. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the battery module of this utility model at one angle.

[0026] Figure 2 This is a structural schematic diagram of the battery module according to an embodiment of the present invention from another angle;

[0027] Figure 3 This is a schematic diagram showing the connection between the battery cell unit, circuit board, and first protective component according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the first protective component according to an embodiment of the present utility model;

[0029] Figure 5 This is a schematic diagram of the integrally formed structure of the connector and the snap-fit ​​part according to an embodiment of the present utility model;

[0030] Figure 6 This is a schematic diagram of the circuit board structure according to an embodiment of the present utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the first fireproof component according to an embodiment of the present utility model;

[0032] Figure 8 This is a schematic diagram of the weak area and the first opening in an embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of the structure of the third fireproof component according to an embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the structure of the box body according to an embodiment of the present utility model;

[0035] Figure 11 This is a schematic diagram of the lower shell structure according to an embodiment of the present utility model;

[0036] Figure 12 This is a schematic diagram of the structure of the top cover according to an embodiment of the present utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Battery cell unit; 11. Electrode; 20. Circuit board; 21. Notch; 211. Mounting edge; 22. Fourth fireproof component; 30. First protective component; 31. Limiting hole; 32. Snap-fit ​​part; 321. Slot; 33. Connecting part; 331. Connector; 40. First fireproof component; 41. Weak area; 42. First fireproof structure; 421. First opening; 43. Second fireproof structure; 50. Second fireproof component; 60. Second protective component; 70. Third fireproof component; 71. Third fireproof structure; 711. First perforation; 72. Fourth fireproof structure; 721. Second perforation; 80. Adhesive-resistant edge; 90. Housing; 91. Receiving cavity; 92. Exhaust cavity; 93. Top cover; 94. Lower shell; 95. Explosion-proof valve; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] The following is combined with Figures 1 to 12 The following describes embodiments of the present invention.

[0041] According to an embodiment of the present invention, in a first aspect, a battery module is provided, having a first direction X, a second direction Y, and a third direction Z intersecting in pairs, including: a battery cell unit 10, a circuit board 20, and a first protective component 30. The battery cell unit 10 has a tab 11 formed at its first end along the third direction Z. The circuit board 20 is disposed opposite to the first end of the battery cell unit 10 along the third direction Z. A notch 21 is provided on the circuit board 20 so that two mounting edges 211 are formed on opposite sides of the notch 21 along the first direction X. The first protective component 30 is snapped onto the mounting edges 211. A limiting hole 31 is formed on the first protective component 30. The first protective component 30 and the tab 11 are disposed in a one-to-one correspondence. The tab 11 passes through the limiting hole 31 and is connected to the circuit board 20.

[0042] In the battery module of this embodiment, the tab 11 extends through the first protective component 30 and is connected to the circuit board 20. The first protective component 30 blocks the notch 21 opened in the circuit board 20, realizing the thermal and electrical separation of the battery module and improving the safety performance of the battery module. In addition, the first protective component 30 and the circuit board 20 are detachably snapped together, which is convenient for manual installation and replacement.

[0043] It should be noted that the need for thermal-electric separation is often overlooked in the design of electric bicycle battery packs. High-temperature gases can easily cause short circuits in the battery module and can easily spread to adjacent cell units 10, thus causing more serious safety problems. In related technologies, glue is often poured at the tab 11. However, the overall weight of the battery module is relatively large after glue is poured at the tab 11.

[0044] Therefore, in this embodiment, the first protective component 30 is used to seal the notch 21 opened in the circuit board 20 to achieve thermal and electrical separation. Furthermore, the first protective component 30 and the circuit board 20 are detachably snapped together, which is convenient for installation and replacement, and also reduces the weight compared to the glue potting method of the tab 11.

[0045] Specifically, such as Figure 6 As shown, the circuit board 20 has several notches 21, and several first protective components 30 are provided, with each of the several first protective components 30 corresponding to one of the several notches 21.

[0046] Specifically, a potting structure is formed by potting glue between the cell unit 10 and the battery pack housing 90. In this embodiment, the potting structure is connected to the second end and the periphery of the cell unit 10 along the third direction Z to ensure that the cell unit 10 vents from the first end.

[0047] In one embodiment, such as Figure 1 As shown, the battery module also includes a sealant edge 80. Several battery cell units 10 form a battery row along a first direction. The sealant edge 80 is disposed on the periphery of the battery row along the first direction to prevent the glue from entering the battery row and causing contamination of the non-glue-target area.

[0048] In one embodiment, such as Figure 4 As shown, the first protective component 30 includes a snap-fit ​​portion 32 and a connecting portion 33. Two snap-fit ​​portions 32 are provided, spaced apart, and each snap-fit ​​portion 32 corresponds to one of the two mounting edges 211. The connecting portion 33 is located between the two snap-fit ​​portions 32 and connects to both snap-fit ​​portions 32 simultaneously to form a limiting hole 31. The connection portion 33 and the snap-fit ​​portions 32 together form the first protective component 30. The structure is simple, and the position of the connecting portion 33 can be adjusted according to the width of the tab 11, improving the applicability of the first protective component 30.

[0049] Specifically, a slot 321 is formed on the snap-fit ​​part 32, and the mounting edge 211 is snapped into the slot 321.

[0050] Furthermore, such as Figure 5As shown, the connecting part 33 includes two connectors 331, which are spaced apart along the second direction Y. The two connectors 331 and the two snap-fit ​​parts 32 surround and form a limiting hole 31. The connecting part 33 and the snap-fit ​​part 32 are integrally formed, which increases the structural strength and improves the structural reliability.

[0051] Specifically, a connector 331 and a snap-fit ​​part 32 are integrally formed into an L-shaped structure, and the two L-shaped structures are connected at their ends to form a limiting hole 31 in the middle part.

[0052] It should be noted that in other alternative embodiments, a hole can be directly formed on the connecting part 33 to form a limiting hole 31, and the connecting part 33 can be directly connected to the two snap-fit ​​parts 32.

[0053] In one embodiment, such as Figure 1 As shown, a plurality of battery cell units 10 are arranged along a first direction X. The battery module also includes a first fireproof component 40, a second fireproof component 50, and a second protective component 60. The first fireproof component 40 and the second fireproof component 50 are respectively disposed on opposite sides of the battery cell unit 10 along the second direction Y and close to the first end of the battery cell unit 10. The second protective component 60 is disposed between two adjacent battery cell units 10. The first fireproof component 40, the second fireproof component 50, the circuit board 20, the first protective component 30, and the two second protective components 60 enclose and form a closed cavity. The closed cavity formed by the first fireproof component 40, the second fireproof component 50, the circuit board 20, the second protective component 60, and the first protective component 30 isolates the high-temperature gas generated during thermal runaway, reduces the occurrence of heat propagation, and improves the safety performance of the battery module.

[0054] It should be noted that because the potting structure is set at the second end and the periphery of the cell unit 10 along the third direction Z, the exhaust direction of the cell unit 10 is fixed to the first end. When the cell unit 10 experiences thermal runaway, a large amount of high-temperature gas is generated. The gas bag at the first end of the cell unit 10 ruptures, and the gas is discharged into the closed cavity to prevent the high-temperature gas from freely diffusing.

[0055] Specifically, the second protective component 60 includes aerogel, foam, and mica paper. Two foams are respectively disposed on both sides of the aerogel along the first direction X, and the mica paper is disposed on the side of the foam away from the aerogel.

[0056] It is worth noting that the second protective component 60 further improves the heat insulation capability between two adjacent battery cells 10.

[0057] Furthermore, such as Figure 8As shown, a weak area 41 is formed on the first fireproof component 40, which is suitable for being opened by gas to open the sealed cavity. When the battery cell 10 experiences thermal runaway, the generated high-temperature gas breaks through the weak area 41 and exhausts outward to prevent excessive pressure in the sealed cavity from causing an explosion.

[0058] Furthermore, such as Figure 7 As shown, the first fireproof component 40 includes a first fireproof structure 42 and a second fireproof structure 43. The first fireproof structure 42 is connected to the battery cell 10 and the second fireproof structure 43 on both sides along the second direction Y, respectively. A first opening 421 is formed on the first fireproof structure 42, and a weak area 41 is formed on the second fireproof structure 43. The first opening 421 is connected to the closed cavity, and the orthogonal projection of the weak area 41 along the second direction Y on the first fireproof structure 42 covers the first opening 421. The second fireproof structure 43 is located on the side of the first fireproof structure 42 away from the battery cell 10, and the orthogonal projection of the weak area 41 along the second direction Y on the first fireproof structure 42 covers the first opening 421. This ensures that the high-temperature gas generated by thermal runaway can be normally exhausted from the inside to the outside, while preventing gas from entering the closed cavity of the battery cell 10 that has not experienced thermal runaway from the outside to the inside. This achieves isolation and sealing between the battery cells 10, reduces the occurrence of heat spread, and improves the safety performance of the battery module.

[0059] Specifically, the first fireproof structure 42 is mica paper with several openings, and the second fireproof structure 43 is mica paper with several serrations.

[0060] Specifically, such as Figure 8 As shown, the weak area 41 is a region with a notch. The orthographic projection area of ​​the weak area 41 in the second direction Y is S1, and the orthographic projection area of ​​the first opening 421 in the second direction Y is S2. The orthographic projection of the weak area 41 along the second direction Y covers the orthographic projection of the first opening 421 along the second direction Y, that is, S1 > S2.

[0061] It should be noted that if S2 > S1, the high-temperature gas from the outside can easily enter the closed cavity directly through the first opening 421 from the groove in the weak area 41, causing heat spread.

[0062] Of course, in other alternative embodiments, the orthographic projection area S1 of the weak area 41 in the second direction Y can also be equal to the orthographic projection area S2 of the first opening 421 in the second direction Y. Alternatively, the orthographic projection of the weak area 41 along the second direction Y on the first fireproof structure 42 can only partially cover the first opening, that is, the weak area 41 and the first opening 421 are misaligned.

[0063] In one embodiment, such as Figure 1 and Figure 2As shown, a plurality of battery cell units 10 are provided, and the plurality of battery cell units 10 are arranged along the first direction X, as follows: Figure 1 As shown, the battery module also includes a third fireproof component 70. At least one third fireproof component 70 is provided, and it covers at least one of two adjacent battery cell units 10. A second opening is formed on the third fireproof component 70, and the second opening is located on the same side as the first opening 421. The third fireproof component 70 further improves the heat insulation capability of the battery cell unit 10, preventing the thermal runaway battery cell unit 10 from rapidly conducting heat to adjacent battery cell units 10, thus avoiding heat diffusion.

[0064] Specifically, the third fireproof component 70 is made of mica paper.

[0065] Specifically, such as Figure 1 As shown, in this embodiment, only one of the two adjacent battery cell units 10 is covered with a third fireproof component 70 on its outer side.

[0066] Of course, in other alternative embodiments, each cell unit 10 can also be covered with a third fireproof component 70. It should be noted that, compared with the above alternative embodiments, in this embodiment, only one cell unit 10 in two adjacent cell units 10 is covered with the third fireproof component 70, which can both ensure the heat insulation between cell units 10 and reduce costs and the weight of the battery module.

[0067] Specifically, such as Figure 9 As shown, the third fireproof component 70 is formed by splicing the third fireproof structure 71 and the fourth fireproof structure 72, which facilitates the covering of the battery cell unit 10.

[0068] Furthermore, such as Figure 9 As shown, the third fireproof structure 71 has a first through hole 711, and the fourth fireproof structure 72 has a second through hole 721. The folded edge of the third fireproof structure 71 overlaps with the folded edge of the fourth fireproof structure 72, and the first through hole 711 and the second through hole 721 overlap to form a second opening.

[0069] It should be noted that, in other alternative embodiments, the third fireproof component 70 can also be integrally formed.

[0070] In one embodiment, the battery module further includes a fourth fireproof element 22, which is disposed on the side of the circuit board 20 away from the first end of the cell unit 10. The fourth fireproof element 22 achieves thermal isolation between the cell unit 10 and the circuit board 20, further improving the thermoelectric separation capability of the battery module and preventing the high-temperature gas generated by the thermal runaway cell from negatively affecting the electrical connection.

[0071] Specifically, the fourth fireproof component 22 is mica paper. Through the fireproof and heat insulation capabilities of mica paper, it can resist the heat between the battery cell unit 10 and the circuit board 20 and improve the thermal separation capability. The fourth fireproof component 22 has corresponding through holes in the notch 21 of the circuit board 20 so that the first protective component 30 can be assembled.

[0072] According to an embodiment of the present invention, in a second aspect, a battery pack is provided, including the battery module and the housing 90 described above; a receiving cavity 91 is formed in the housing 90, and the battery module is disposed in the receiving cavity 91.

[0073] In one embodiment, such as Figures 10 to 12 As shown, an exhaust chamber 92 is also formed inside the housing 90. The exhaust chamber 92 is located on the side of the housing 90 and is connected to the receiving cavity 91. An explosion-proof valve 95 is installed on the housing 90 and is connected to the exhaust chamber 92. Using the side of the housing 90 for exhaust keeps the high-temperature gas away from the integrated busbar and increases the utilization rate of the side of the housing 90.

[0074] Specifically, such as Figures 10 to 12 As shown, the housing 90 includes an upper cover 93 and a lower shell 94. A receiving cavity 91 is formed inside the lower shell 94. An opening is formed at one end of the lower shell 94. The upper cover 93 covers the opening. An exhaust cavity 92 is formed on the side of the lower shell 94. An explosion-proof valve 95 is disposed on the upper cover 93.

[0075] It should be noted that in related technologies, the exhaust chamber 92 is often located near the integrated busbar, which can cause the high-temperature gas to have a high-temperature impact on the integrated busbar during the exhaust process. Therefore, in this embodiment, the exhaust chamber 92 is located on the side of the lower shell 94, and an explosion-proof valve 95 is provided corresponding to the exhaust chamber 92 on the side to keep the high-temperature gas away from the integrated busbar and reduce the impact of the high-temperature gas on the integrated busbar.

[0076] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A battery module having intersecting first direction (X), second direction (Y), and third direction (Z), characterized in that, include: A battery cell unit (10) has a tab (11) formed at its first end along a third direction (Z); A circuit board (20) is disposed opposite to the first end of the battery cell (10) along a third direction (Z). A notch (21) is provided on the circuit board (20) so that two mounting edges (211) are formed on opposite sides of the notch (21) along the first direction (X). The first protective component (30) is snapped onto the mounting edge (211). A limiting hole (31) is formed on the first protective component (30). The first protective component (30) and the tab (11) are arranged in a one-to-one correspondence. The tab (11) passes through the limiting hole (31) and is connected to the circuit board (20).

2. The battery module according to claim 1, characterized in that, The first protective component (30) includes a snap-fit ​​part (32) and a connecting part (33). There are two snap-fit ​​parts (32), which are spaced apart. The two snap-fit ​​parts (32) are snap-fitted into two mounting edges (211) in a one-to-one correspondence. The connecting part (33) is disposed between the two snap-fit ​​parts (32) and is connected to both snap-fit ​​parts (32) to form the limiting hole (31).

3. The battery module according to claim 2, characterized in that, The connecting part (33) includes a connector (331), and two connectors (331) are provided at intervals along the second direction (Y). The two connectors (331) and the two snap-fit ​​parts (32) surround and form the limiting hole (31).

4. The battery module according to any one of claims 1-3, characterized in that, The battery cell unit (10) is provided in a plurality of manner, and the plurality of battery cell units (10) are arranged along a first direction (X). The battery module further includes a first fireproof component (40), a second fireproof component (50), and a second protective component (60). The first fireproof component (40) and the second fireproof component (50) are respectively disposed on opposite sides of the battery cell unit (10) along a second direction (Y) and are disposed close to the first end of the battery cell unit (10). The second protective component (60) is disposed between two adjacent battery cell units (10). The first fireproof component (40), the second fireproof component (50), the circuit board (20), the first protective component (30), and the two adjacent second protective components (60) enclose a closed cavity.

5. The battery module according to claim 4, characterized in that, The first fireproof component (40) has a weak area (41) formed thereon, the weak area (41) being adapted to be opened by gas to open the closed cavity.

6. The battery module according to claim 5, characterized in that, The first fireproof component (40) includes a first fireproof structure (42) and a second fireproof structure (43). The first fireproof structure (42) is connected to the battery cell (10) and the second fireproof structure (43) on both sides along the second direction (Y). A first opening (421) is formed on the first fireproof structure (42), and a weak area (41) is formed on the second fireproof structure (43). The first opening (421) is connected to the closed cavity. The orthographic projection of the weak area (41) along the second direction (Y) on the first fireproof structure (42) at least partially covers the first opening (421).

7. The battery module according to claim 6, characterized in that, The battery module also includes a third fireproof component (70), at least one of which is provided. The third fireproof component (70) covers at least one of the two adjacent battery cells (10). A second opening is formed on the third fireproof component (70), and the second opening is located on the same side as the first opening (421).

8. The battery module according to any one of claims 1-3, characterized in that, The battery module also includes a fourth fireproof component (22), which is disposed on the side of the circuit board (20) away from the first end of the cell unit (10).

9. A battery pack, characterized in that, include: The battery module according to any one of claims 1 to 8; The housing (90) has a receiving cavity (91) formed inside it, and the battery module is disposed in the receiving cavity (91).

10. The battery pack according to claim 9, characterized in that, An exhaust chamber (92) is also formed inside the housing (90). The exhaust chamber (92) is located on the side of the housing (90). The exhaust chamber (92) is connected to the receiving cavity (91). An explosion-proof valve (95) is provided on the housing (90). The explosion-proof valve (95) is connected to the exhaust chamber (92).

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