Battery pack

Abstract

The utility model belongs to battery technical field discloses a battery pack, including box body subassembly, electric core, battery pack explosion -proof valve, fume exhaust hood and gasket, electric core is located in the box body subassembly, and is equipped with electric core explosion -proof valve, battery pack explosion -proof valve is connected in the box body subassembly, and it includes pressure -relief portion, fume exhaust hood is connected in the inner wall of box body subassembly, and covers the pressure -relief portion, fume exhaust hood and box body subassembly surround and set up and set up fume exhaust passage, be equipped with first through -hole on fume exhaust hood, gasket is located between electric core explosion -proof valve and fume exhaust hood, gasket is equipped with second through -hole, first through -hole, second through -hole and electric core explosion -proof valve at least partial opposite. The high temperature and high pressure material of thermal runaway generation passes through electric core explosion -proof valve, second through -hole, first through -hole and enters fume exhaust passage, and then discharges through battery pack explosion -proof valve. Gasket can effectively fill the gap between fume exhaust hood and electric core, avoid high temperature and high pressure material through the gap leakage to lead to with electrical element or adjacent electric core contact, reduce the risk of thermal runaway of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] In the event of thermal runaway, a battery cell will rapidly release the electrical and chemical energy stored within it, causing the electrolyte and chemical substances inside to decompose rapidly and generate a large amount of gas. This leads to a sharp increase in the internal pressure of the battery cell. To prevent the battery cell from exploding due to excessive internal pressure, a battery cell explosion-proof valve is often installed on the battery cell for pressure relief. At the same time, a battery pack explosion-proof valve is installed on the battery pack to balance the gas pressure inside and outside the battery pack, and to quickly discharge internal heat and compressed gas when thermal runaway occurs inside the battery pack, preventing the thermal runaway from spreading further.

[0003] When a battery cell experiences thermal runaway, the cell's explosion-proof valve opens first to reduce the internal pressure and prevent an explosion. Then, the battery pack's explosion-proof valve opens to release gas. However, the direction in which the electrolyte and high-temperature gas are ejected after the cell's explosion-proof valve opens is highly random. This could melt nearby conductive wires, causing an internal short circuit and further spreading the thermal runaway. It could also directly affect adjacent cells, causing them to also experience thermal runaway, ultimately leading to overall thermal runaway of the battery pack, posing a high safety risk. Utility Model Content

[0004] The purpose of this invention is to provide a battery pack that solves the problems of conductive wire melting and thermal runaway of nearby cells caused by the random direction of high-temperature material ejection during cell thermal runaway, thereby improving the safety of the battery pack.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery pack is provided, comprising:

[0007] Enclosure assembly;

[0008] The battery cell is located inside the housing assembly, and the battery cell is equipped with a battery cell explosion-proof valve;

[0009] A battery pack explosion-proof valve is connected to the housing assembly, and the battery pack explosion-proof valve includes a pressure relief section;

[0010] A smoke exhaust hood is connected to the inner wall of the housing assembly and covers the pressure relief part. The smoke exhaust hood and the housing assembly form a smoke exhaust channel. The smoke exhaust hood is provided with a first through hole.

[0011] A gasket is disposed between the cell explosion-proof valve and the fume hood. The gasket is provided with a second through hole, and the first through hole, the second through hole and the cell explosion-proof valve are at least partially opposite to each other.

[0012] As an optional solution for the battery pack provided by this utility model, the housing assembly includes a first plate and a second plate arranged at an angle, the cell explosion-proof valve faces the first plate, and the battery pack explosion-proof valve is connected to the second plate;

[0013] The smoke hood includes a first cover and a second cover connected to each other. The first cover is connected to the first plate and has the first through hole. The gasket is located between the first cover and the battery cell. The second cover is connected to the second plate and covers the pressure relief part.

[0014] As an optional solution for the battery pack provided by this utility model, the smoke hood further includes an arc-shaped section, the first cover is connected to the second cover through the arc-shaped section, and the arc-shaped section is connected at the junction of the first plate and the second plate;

[0015] And / or,

[0016] The battery cells are provided in multiple ways along the first direction, the first cover is provided with multiple first through holes, the multiple first through holes are arranged along the first direction, the gasket is provided with multiple second through holes, the multiple second through holes are arranged along the first direction; the multiple first through holes, the multiple second through holes and the multiple battery cell explosion-proof valves are provided one-to-one.

[0017] As an optional solution for the battery pack provided by this utility model, the side of the gasket facing the exhaust hood is provided with a first adhesive structure; and / or, the side of the gasket facing the battery cell is provided with a second adhesive structure.

[0018] As an optional solution for the battery pack provided by this utility model, the exhaust hood is provided with a clearance hole, and the explosion-proof valve of the battery pack is sealed through the clearance hole.

[0019] As an optional solution for the battery pack provided by this utility model, a sealant structure is provided between the explosion-proof valve of the battery pack and the clearance hole.

[0020] As an optional solution for the battery pack provided by this utility model, the housing assembly includes a housing base and a housing cover. The housing cover is fastened to the housing base and together with the housing base, forms an installation space. The battery cell is located in the installation space and is connected to the housing base.

[0021] The smoke hood is connected to the box cover.

[0022] As an optional solution for the battery pack provided by this utility model, the housing assembly is provided with a convex structure, the convex structure protruding towards the battery cell, and the exhaust hood is provided with a groove structure, the groove structure engaging with the convex structure.

[0023] As an optional solution for the battery pack provided by this utility model, the exhaust hood is provided with a flange structure along the circumference, and the flange structure is fitted and sealed to the inner wall of the housing assembly.

[0024] As an optional solution for the battery pack provided by this utility model, the smoke hood includes a smoke guide plate, which is spaced apart from the inner wall of the housing assembly, and the smoke guide plate is attached to the gasket;

[0025] The smoke exhaust duct is provided with a heat insulation layer, which at least covers the smoke guide plate.

[0026] The beneficial effects of this utility model are:

[0027] This invention provides a battery pack with a fume hood on the housing assembly for guiding high-temperature, high-pressure thermal runaway substances. The cell explosion-proof valve is connected to the battery pack explosion-proof valve through this fume hood. When a cell experiences thermal runaway, causing the corresponding cell explosion-proof valve to open, the high-temperature, high-pressure substances generated by the runaway enter the exhaust channel through the cell explosion-proof valve, the second through-hole on the gasket, and the first through-hole on the fume hood. These substances are then discharged through the battery pack explosion-proof valve, balancing the internal and external air pressure of the battery pack and preventing the high-temperature, high-pressure substances from contacting electrical components or adjacent cells, thus preventing the spread of thermal runaway and improving the battery pack's safety. Furthermore, connecting the fume hood to the inner wall of the housing assembly increases the structural strength of the housing assembly to a certain extent, improving its resistance to drops, compression, and deformation. In addition, due to manufacturing tolerances and other reasons, the exhaust hood and the battery cell may not be able to fit together directly. The gap between the two can cause high-temperature and high-pressure thermal runaway substances to leak from the gap. By inserting a gasket between the exhaust hood and the battery cell, the gap between the exhaust hood and the battery cell can be effectively filled, preventing high-temperature and high-pressure substances from leaking through the gap and coming into contact with electrical components or nearby battery cells, thus reducing the risk of thermal runaway of the battery pack. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0029] Figure 1 This is an exploded view of the battery pack provided in a specific embodiment of this utility model;

[0030] Figure 2 This is a schematic diagram of the battery pack cover and exhaust hood provided in a specific embodiment of this utility model;

[0031] Figure 3This is a partial cross-sectional view of the battery pack provided in a specific embodiment of this utility model;

[0032] Figure 4 This is a cross-sectional view of the battery pack cover and exhaust hood provided in a specific embodiment of this utility model;

[0033] Figure 5 yes Figure 2 A magnified view of a section at point A in the middle;

[0034] Figure 6 This is a schematic diagram of the structure of the gasket provided in a specific embodiment of this utility model;

[0035] Figure 7 This is a schematic diagram showing the connection between the smoke hood and the box cover provided in one embodiment of this utility model.

[0036] In the picture:

[0037] 1. Housing assembly; 2. Battery cell; 3. Battery pack explosion-proof valve; 4. Exhaust hood; 5. Gasket; 20. Battery cell module;

[0038] 11. Box base; 12. Box cover; 10. Installation space;

[0039] 121. First plate; 122. Second plate; 123. Convex hull structure;

[0040] 21. Battery cell explosion-proof valve;

[0041] 31. Pressure relief section;

[0042] 40. Smoke exhaust duct; 41. First cover; 42. Second cover; 43. Arc-shaped section; 44. Groove structure; 45. Flanged structure;

[0043] 410. First flue; 420. Second flue;

[0044] 411. Smoke guide plate; 412. Side panel; 4110. First through hole;

[0045] 421. Leaving hole;

[0046] 51. Second through hole; 52. First adhesive structure; 53. Second adhesive structure. Detailed Implementation

[0047] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0048] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0051] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0052] In the embodiments of this utility model, the same reference numerals denote the same parts, and for the sake of brevity, detailed descriptions of the same parts are omitted in different embodiments.

[0053] like Figure 1As shown, this embodiment provides a battery pack, including a housing assembly 1 and at least one battery cell module 20 disposed within the housing assembly 1. Exemplarily, each battery cell module 20 includes a plurality of battery cells 2 arranged along a first direction. Multiple battery cell modules 20 are provided, and the plurality of battery cell modules 20 are arranged along a second direction. The height direction of the battery cells 2 is a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other. Each battery cell 2 is provided with a battery cell explosion-proof valve 21.

[0054] Combination Figure 2 , Figure 3 as well as Figure 4 The battery pack also includes a battery pack explosion-proof valve 3, a fume hood 4, and a gasket 5. The battery pack explosion-proof valve 3 is connected to the housing assembly 1 and includes a pressure relief section 31. The fume hood 4 is connected to the inner wall of the housing assembly 1 and covers the pressure relief section 31. The fume hood 4 and the housing assembly 1 form a fume exhaust channel 40, and the fume hood 4 is provided with a first through hole 4110. The gasket 5 is located between the cell explosion-proof valve 21 and the fume hood 4, and the gasket 5 is provided with a second through hole 51. The first through hole 4110, the second through hole 51, and the cell explosion-proof valve 21 are at least partially opposite to each other.

[0055] The battery pack provided in this embodiment has a fume hood 4 on the housing assembly 1 for guiding high-temperature, high-pressure thermal runaway substances. The cell explosion-proof valve 21 can be connected to the battery pack explosion-proof valve 3 through the fume hood 4. When a cell 2 experiences thermal runaway, causing the corresponding cell explosion-proof valve 21 to open, the high-temperature, high-pressure substances generated by the thermal runaway enter the fume exhaust channel 40 through the cell explosion-proof valve 21, the second through hole 51 on the gasket 5, and the first through hole 4110 on the fume hood 4, and are then discharged through the battery pack explosion-proof valve 3. This balances the air pressure inside and outside the battery pack, preventing the high-temperature, high-pressure substances from contacting the electrical components or adjacent cells 2 inside the battery pack, thus preventing the spread of thermal runaway and improving the safety of the battery pack. Moreover, connecting the fume hood 4 to the inner wall of the housing assembly 1 can increase the structural strength of the housing assembly 1 to a certain extent, improving its resistance to drops, compression, and deformation. In addition, due to manufacturing tolerances and other reasons, the exhaust hood 4 and the battery cell 2 may not be able to be directly attached. There is a gap between the two, which may cause high-temperature and high-pressure thermal runaway substances to leak from the gap. By inserting a gasket 5 between the exhaust hood 4 and the battery cell 2, the gap between the exhaust hood 4 and the battery cell 2 can be effectively filled, preventing high-temperature and high-pressure substances from leaking through the gap and coming into contact with electrical components or adjacent battery cells 2, thereby reducing the risk of thermal runaway of the battery pack.

[0056] Optionally, the first through hole 4110, the second through hole 51, and the battery cell explosion-proof valve 21 are identical in shape and size, and are set in a completely opposite position to ensure that high-temperature and high-pressure substances have sufficient channels to flow into the fume hood 4.

[0057] For example, the smoke hood 4 is welded to the inner wall of the housing assembly 1 to ensure the airtightness of the smoke exhaust channel 40.

[0058] For example, the gasket 5 includes compressible foam that can effectively fill the gap between the fume hood 4 and the battery cell 2, preventing the leakage of high-temperature and high-pressure substances through the gap.

[0059] In this embodiment, see Figure 1 and Figure 3 The enclosure assembly 1 includes an enclosure base 11 and an enclosure cover 12. The enclosure cover 12 is fastened to the enclosure base 11, forming an installation space 10. The battery cells 2 are located within the installation space 10 and are fixedly connected to the enclosure base 11. Optionally, multiple battery cells 2 in each battery cell module 20 are fixed together by a fixing bracket. The fixing bracket is fixedly connected to the enclosure base 11 by long bolts or screws, thus fixing the battery cells 2 within the enclosure assembly 1. The enclosure cover 12 is fastened to the enclosure base 11 and fixed by bolts or screws, ensuring the airtightness of the installation space 10. An explosion-proof valve is installed on the enclosure cover 12, and a fume hood 4 is connected to the inner wall of the enclosure cover 12, which increases the structural strength of the enclosure cover 12 and improves its resistance to drops, compression, and deformation.

[0060] See Figure 2 , Figure 3 as well as Figure 4 The cover 12 of the enclosure assembly 1 includes a first plate 121 and a second plate 122 arranged at an angle. The first plate 121 is parallel to and spaced apart from the enclosure base 11. Multiple second plates 122 are arranged along the circumference of the first plate 121. The cell explosion-proof valve 21 faces the first plate 121, and the battery pack explosion-proof valve 3 is connected to one of the second plates 122.

[0061] The smoke hood 4 includes a first cover 41 and a second cover 42 connected to each other. The first cover 41 is connected to the first plate 121 and is provided with the first through hole 4110 mentioned above. The gasket 5 is located between the first cover 41 and the battery cell 2. The second cover 42 is connected to the second plate 122 and covers the pressure relief part 31 of the battery pack explosion-proof valve 3.

[0062] In this embodiment, the first cover 41 and the first plate 121 are sealed together to form a first exhaust duct 410, and the second cover 42 and the second plate 122 are sealed together to form a second exhaust duct 420. The exhaust duct 40 includes the first exhaust duct 410 and the second exhaust duct 420. By setting the first cover 41 and the second cover 42, the high-temperature and high-pressure material ejected through the cell explosion-proof valve 21 can first enter the first exhaust duct 410 and then enter the second exhaust duct 420, so as to be discharged through the pressure relief part 31 of the battery pack explosion-proof valve 3.

[0063] Of course, in other embodiments, the first cover 41 and the second cover 42 can also be tubular, in which case they do not need to be sealed and connected with the first plate 121 and the second plate 122, and can also form the first exhaust duct 410 and the second exhaust duct 420.

[0064] Further, see Figure 2 The smoke hood 4 also includes an arc-shaped segment 43. The first cover 41 is connected to the second cover 42 via the arc-shaped segment 43, which is located at the junction of the first plate 121 and the second plate 122. The arc-shaped segment 43 serves as a transitional connection between the first cover 41 and the second cover 42, and avoids stress concentration at the connection point. In this embodiment, the arc-shaped segment 43 is sealed at the junction of the first plate 121 and the second plate 122. In other embodiments, when the arc-shaped segment 43 is a tubular structure, it may not be sealed at the junction of the first plate 121 and the second plate 122.

[0065] See Figure 1 Multiple battery cell modules 20 are arranged along the second direction, and multiple battery cells 2 are arranged along the first direction in each battery cell module 20. The exhaust hood 4 includes multiple first covers 41 and multiple gaskets 5, with the multiple first covers 41, multiple gaskets 5, and multiple battery cell modules 20 arranged in a one-to-one correspondence. Each first cover 41 is provided with multiple first through holes 4110, which are arranged along the first direction. Each gasket 5 is provided with multiple second through holes 51, which are also arranged along the first direction. The multiple first through holes 4110, multiple second through holes 51, and multiple battery cell explosion-proof valves 21 are arranged in a one-to-one correspondence. The high-temperature and high-pressure substances ejected from each battery cell explosion-proof valve 21 can enter the corresponding first exhaust duct 410 through the corresponding second through hole 51 and first through hole 4110, and then be discharged through the second exhaust duct 420 and the battery pack explosion-proof valve 3. Understandably, each of the first housings 41 is connected to the second housing 42 via an arc segment 43.

[0066] like Figure 2 , Figure 4 as well as Figure 5 As shown, the second housing 42 of the fume hood 4 is provided with a clearance hole 421, through which the battery pack explosion-proof valve 3 partially and sealed. By providing this clearance hole 421 for the battery pack explosion-proof valve 3 to pass through, the portion of the battery pack explosion-proof valve 3 located inside the battery pack can be accommodated. This prevents interference between the second housing 42 and the battery pack explosion-proof valve 3, reduces the size of the second housing 42 along the first direction, saves material usage in the fume hood 4, and makes full use of the space inside the battery pack. In addition, the battery pack explosion-proof valve 3 and the clearance hole 421 are sealed together, preventing high-temperature and high-pressure substances entering the second housing 42 from leaking through the gap between the clearance hole 421 and the battery pack explosion-proof valve 3.

[0067] Optionally, a sealant structure is provided between the battery pack explosion-proof valve 3 and the clearance hole 421. The sealant structure can fill the gap between the battery pack explosion-proof valve 3 and the clearance hole 421, preventing high-temperature and high-pressure substances from leaking through the gap. For example, the sealant structure is a polyurethane sealant structure.

[0068] See Figure 6 A first adhesive structure 52 is provided on the side of the gasket 5 facing the exhaust hood 4. The gasket 5 is bonded and fixed to the first cover 41 of the exhaust hood 4 through the first adhesive structure 52. A second adhesive structure 53 is provided on the side of the gasket 5 facing the battery cell 2. The gasket 5 is directly bonded to the battery cell 2 through the second adhesive structure 53, or bonded to a component disposed above the battery cell 2. By providing the first adhesive structure 52 and the second adhesive structure 53, a stable connection of the gasket 5 between the exhaust hood 4 and the battery cell 2 can be achieved, ensuring a seamless connection between the exhaust hood 4 and the battery cell 2.

[0069] For example, the first adhesive structure 52 and the second adhesive structure 53 can be polyurethane structural adhesive, acrylic structural adhesive, silicone, epoxy structural adhesive, etc.

[0070] like Figure 7 As shown, the cover 12 of the housing assembly 1 is provided with a protruding structure 123. The protruding structure 123 protrudes towards the battery cell 2. That is, the inner wall of the cover 12 is provided with a protruding structure 123 protruding into the installation space 10, which can effectively increase the strength and deformation resistance of the cover 12.

[0071] In some embodiments, see Figure 7 The first cover 41 of the smoke hood 4 is provided with a groove structure 44, which engages with the convex structure 123, thereby improving the connection stability between the first cover 41 and the box cover 12 and achieving a seamless fit between the first cover 41 and the box cover 12, making it more stable after welding.

[0072] In other embodiments, the groove structure 44 may not be provided on the first cover 41 of the fume hood 4, and the gap between the first cover 41 and the box cover 12 may be filled directly by welding, making the structure and manufacturing process of the fume hood 4 simpler.

[0073] In some embodiments, see Figure 7 The fume hood 4 is provided with a flange structure 45 along its circumference. The flange structure 45 fits snugly and is sealed to the inner wall of the housing assembly 1. By providing the flange structure 45, the contact area between the fume hood 4 and the housing cover 12 can be increased, resulting in a more stable weld. For example, the flange structure 45 can be provided on the outer periphery of both the first cover 41 and the second cover 42.

[0074] Of course, in other embodiments, the fume hood 4 may not have a flange structure 45 along the circumferential direction, and the outer periphery of the fume hood 4 may be directly welded to the inner wall of the box cover 12.

[0075] like Figure 2 and Figure 3 As shown, the smoke hood 4 includes a smoke guide plate 411 and a side panel 412. The smoke guide plate 411 is spaced apart from the inner wall of the housing assembly 1, and is attached to the gasket 5, and has the aforementioned first through hole 4110. The side panel 412 is arranged around the circumference of the smoke guide plate 411, and the circumferential edge of the side panel 412 is welded to the inner wall of the housing cover 12. Optionally, a heat insulation layer is provided in the smoke exhaust channel 40, and the heat insulation layer at least covers the smoke guide plate 411. The heat insulation layer can further thermally isolate high-temperature and high-pressure substances and the battery cell 2, preventing high-temperature and high-pressure substances entering the first housing 41 from transferring high temperature to the battery cell 2 below through the smoke guide plate 411, thereby minimizing the temperature rise of the battery cell 2.

[0076] For example, the insulation layer can be made of aerogel, ceramicized foam, insulating silicone foam, etc. The insulation layer can be bonded to the smoke guide plate 411.

[0077] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery pack, characterized in that, include: Box assembly (1); The battery cell (2) is located inside the housing assembly (1), and the battery cell (2) is equipped with a battery cell explosion-proof valve (21); A battery pack explosion-proof valve (3) is connected to the housing assembly (1), and the battery pack explosion-proof valve (3) includes a pressure relief section (31); Smoke hood (4), the smoke hood (4) is connected to the inner wall of the box assembly (1) and covers the pressure relief part (31), the smoke hood (4) and the box assembly (1) form a smoke exhaust channel (40), and the smoke hood (4) is provided with a first through hole (4110); A gasket (5) is disposed between the cell explosion-proof valve (21) and the smoke hood (4). The gasket (5) is provided with a second through hole (51). The first through hole (4110), the second through hole (51) and the cell explosion-proof valve (21) are at least partially opposite to each other.

2. The battery pack according to claim 1, characterized in that, The housing assembly (1) includes a first plate (121) and a second plate (122) arranged at an angle, the cell explosion-proof valve (21) faces the first plate (121), and the battery pack explosion-proof valve (3) is connected to the second plate (122). The smoke hood (4) includes a first cover (41) and a second cover (42) connected to each other. The first cover (41) is connected to the first plate (121) and is provided with the first through hole (4110). The gasket (5) is located between the first cover (41) and the battery cell (2). The second cover (42) is connected to the second plate (122) and covers the pressure relief part (31).

3. The battery pack according to claim 2, characterized in that, The smoke hood (4) further includes an arc-shaped section (43), the first cover (41) is connected to the second cover (42) through the arc-shaped section (43), and the arc-shaped section (43) is connected at the junction of the first plate (121) and the second plate (122); And / or, The battery cell (2) is provided with a plurality of first through holes (4110) along the first direction, the first cover (41) is provided with a plurality of first through holes (4110) arranged along the first direction, the gasket (5) is provided with a plurality of second through holes (51) arranged along the first direction; the plurality of first through holes (4110), the plurality of second through holes (51) and the plurality of battery cell explosion-proof valves (21) are provided one-to-one.

4. The battery pack according to claim 1, characterized in that, The gasket (5) has a first adhesive structure (52) on the side facing the smoke hood (4); and / or, the gasket (5) has a second adhesive structure (53) on the side facing the battery cell (2).

5. The battery pack according to claim 1, characterized in that, The exhaust hood (4) is provided with a clearance hole (421), and the battery pack explosion-proof valve (3) is sealed through the clearance hole (421).

6. The battery pack according to claim 5, characterized in that, A sealant structure is provided between the battery pack explosion-proof valve (3) and the clearance hole (421).

7. The battery pack according to any one of claims 1-6, characterized in that, The enclosure assembly (1) includes an enclosure base (11) and an enclosure cover (12). The enclosure cover (12) is fastened to the enclosure base (11) and together with the enclosure base (11) forms an installation space (10). The battery cell (2) is located in the installation space (10) and is connected to the enclosure base (11). The smoke hood (4) is connected to the box cover (12).

8. The battery pack according to any one of claims 1-6, characterized in that, The housing assembly (1) is provided with a convex structure (123) which protrudes toward the battery cell (2). The exhaust hood (4) is provided with a groove structure (44) which engages with the convex structure (123).

9. The battery pack according to any one of claims 1-6, characterized in that, The smoke hood (4) is provided with a flange structure (45) along the circumference, and the flange structure (45) is fitted and sealed to the inner wall of the box assembly (1).

10. The battery pack according to any one of claims 1-6, characterized in that, The smoke hood (4) includes a smoke guide plate (411), which is spaced apart from the inner wall of the housing assembly (1), and the smoke guide plate (411) is attached to the gasket (5); The smoke exhaust channel (40) is provided with a heat insulation layer, which at least covers the smoke guide plate (411).

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