Battery pack and energy storage device

Abstract

The utility model discloses a battery pack and an energy storage device. The battery pack comprises a shell and at least one battery cell group, a containing cavity is formed in the shell, and a plurality of first exhaust channels and at least one second exhaust channel are formed in the side wall of one side of the containing cavity; the battery cell group is arranged in the accommodating cavity, at least one explosion venting opening is formed in the battery cell group, and the explosion venting opening is communicated with the first exhaust channel. A plurality of first exhaust channels and at least one second exhaust channel are formed in the side wall of one side of a containing cavity, and explosion venting ports in a battery cell group are communicated with the first exhaust channels; heat and gas generated after explosion venting of the battery cells can enter the first exhaust channel through the explosion venting opening or flow to the second exhaust channel through the first exhaust channel, and finally are exhausted out of the battery pack, so that the situation that other battery cells and high-low voltage connecting pieces are affected by jets generated after explosion venting of the battery cells is avoided, thermal runaway spreading is prevented, and explosion of the battery pack is avoided; the service life of the battery pack is prolonged, and the safety and reliability of the battery pack are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery pack thermal runaway protection technology, and in particular to a battery pack and energy storage device. Background Technology

[0002] In existing technologies, the internal thermal runaway protection of battery modules is poor, and they cannot dissipate heat quickly or block the spread of thermal runaway in time, which may lead to the spread of thermal runaway and even the battery pack explosion, thus reducing the safety and reliability of the battery pack. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a battery pack that can improve the safety and reliability of the battery pack.

[0004] The second objective of this invention is to provide an energy storage device, including the battery pack described in the above embodiments.

[0005] According to a first aspect embodiment of the present invention, the battery pack includes: a housing and at least one battery cell assembly; the housing forms a receiving cavity; a plurality of first exhaust channels and at least one second exhaust channel are formed on one side wall of the receiving cavity; the second exhaust channel intersects with at least two of the plurality of first exhaust channels and communicates with each other; the battery cell assembly is disposed within the receiving cavity; the first exhaust channels extend along the arrangement direction of the battery cell assembly; the battery cell assembly is provided with at least one explosion vent; the explosion vent is disposed facing the first exhaust channel and communicates with the first exhaust channel.

[0006] According to the battery pack of this utility model embodiment, multiple first exhaust channels and at least one second exhaust channel are formed on one side wall of the receiving cavity, and the explosion vent on the cell assembly is connected to the first exhaust channel. When the cell experiences thermal runaway, the heat and gas generated after the cell explodes can enter the first exhaust channel through the explosion vent or flow to the second exhaust channel through the first exhaust channel, and finally be discharged to the outside of the battery pack. This prevents the ejected material after the cell explodes from affecting other cells and high and low voltage connectors, avoids short circuits, effectively prevents the spread of thermal runaway, prevents the battery pack from exploding, extends the service life of the battery pack, and improves the safety and reliability of the battery pack.

[0007] In some embodiments, a plurality of the first exhaust channels are arranged along a first direction and extend along a second direction, and the second exhaust channel is disposed at one end of the first exhaust channel along the second direction; the battery pack further includes: an explosion-proof valve, the explosion-proof valve is disposed on the housing, and the explosion-proof valve is opposite to at least one end of the second exhaust channel along the first direction.

[0008] In some embodiments, the explosion-proof valve is disposed opposite to at least one end of the first exhaust passage along the second direction.

[0009] In some embodiments, the plurality of first exhaust channels include: an edge exhaust channel and a middle exhaust channel, wherein the edge exhaust channel is disposed along a first direction at the edge of the housing; the middle exhaust channel is disposed between the edge exhaust channels, and the second exhaust channel communicates with the middle exhaust channel.

[0010] In some embodiments, the two ends of the second exhaust passage are respectively opposite to the same end of the edge exhaust passage along the second direction, and the explosion-proof valve is opposite to the edge exhaust passage.

[0011] In some embodiments, the first exhaust passage and the explosion-proof valve are spaced apart; and / or, the second exhaust passage and the explosion-proof valve are spaced apart.

[0012] In some embodiments, the battery pack further includes a buffer disposed between the sidewall of the receiving cavity and the cell assembly.

[0013] In some embodiments, the housing includes a housing body and a cover, the cover and the housing body defining the receiving cavity, the battery cell assembly being disposed within the receiving cavity, and the cover having a first exhaust channel and a second exhaust channel.

[0014] In some embodiments, the cover has a channel member on the side facing the shell body, the channel member forming the first exhaust channel and the second exhaust channel; the channel member and the cover are integrally formed; or, the channel member is welded to the cover.

[0015] The energy storage device according to a second aspect of the present invention includes the battery pack described in the above embodiments.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the cover body according to an embodiment of the present utility model;

[0019] Figure 2 This is a partial schematic diagram of a battery pack according to an embodiment of the present utility model.

[0020] Figure label:

[0021] 100. Battery pack;

[0022] 10. Housing; 11. Housing body; 12. Cover; 121. Through hole; 13. Battery cell assembly; 14. Explosion-proof valve; 15. Channel component;

[0023] 20. First channel component; 201. Exhaust port; 21. Edge exhaust channel; 22. Middle exhaust channel;

[0024] 30. Second channel component; 31. Second exhaust channel;

[0025] 40. Third side wall; 41. Fourth side wall; 42. Fifth side wall; 43. Sixth side wall;

[0026] A. First direction; B. Second direction. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-2 The battery pack 100 according to an embodiment of the present utility model is described. The battery pack 100 includes: a housing 10 and at least one battery cell group 13.

[0028] like Figure 1 and Figure 2 As shown, the housing 10 has a receiving cavity. A plurality of first exhaust channels and at least one second exhaust channel 31 are formed on one side wall of the receiving cavity. The second exhaust channel 31 intersects with at least two of the plurality of first exhaust channels and communicates with them. A battery cell assembly 13 is disposed within the receiving cavity. The first exhaust channels extend along the arrangement direction of the battery cell assembly 13. The battery cell assembly 13 has at least one explosion vent, which faces the first exhaust channel and communicates with it. In this embodiment, the first direction A is the width direction of the battery pack 100, and the second direction B is the length direction of the battery pack 100.

[0029] The housing 10 includes a first sidewall and a second sidewall opposite to each other along the height direction of the battery pack 100. A plurality of first exhaust channels and at least one second exhaust channel 31 are disposed on the surface of the first sidewall adjacent to the second sidewall. A cell assembly 13 is disposed on the surface of the second sidewall adjacent to the first sidewall. In this embodiment, the battery pack 100 includes a plurality of cell assemblies 13, which are spaced apart along a first direction A. Each cell assembly 13 includes a plurality of cells arranged sequentially along a second direction B. Each cell has a vent at one end adjacent to a first exhaust channel along the height direction of the battery pack 100. The vents of the multiple cell assemblies 13 are opposite to and communicate with the multiple first exhaust channels. Gas released from the vents is discharged through the first exhaust channel or flows through the first exhaust channel to the second exhaust channel 31 for discharge. An explosion-proof valve 14 is opposite to a portion of the first exhaust channels along the second direction B. First exhaust channels not opposite to the explosion-proof valve 14 flow to the explosion-proof valve 14 through the second exhaust channel 31, reducing the number of explosion-proof valves 14 and increasing their guiding effect on the first exhaust channels.

[0030] It is understandable that the positions of the first exhaust channel, the second exhaust channel 31, and the cell group 13 can be specifically set according to the actual requirements of different battery packs 100 in order to better meet practical applications.

[0031] According to the embodiment of the present invention, the battery pack 100 has multiple first exhaust channels and at least one second exhaust channel 31 formed on one side wall of the receiving cavity, and the explosion vent on the cell group 13 is connected to the first exhaust channel. When the cell experiences thermal runaway, the heat and gas generated after the cell explodes can enter the first exhaust channel through the explosion vent or flow to the second exhaust channel 31 through the first exhaust channel, and finally be discharged to the outside of the battery pack 100. This avoids the ejected material after the cell explodes from affecting other cells and high and low voltage connectors, avoids short circuits, effectively prevents the spread of thermal runaway, prevents the battery pack 100 from exploding, extends the service life of the battery pack 100, and improves the safety and reliability of the battery pack 100.

[0032] According to some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, a plurality of first exhaust channels are arranged along a first direction A and extend along a second direction B. A second exhaust channel 31 is located at one end of the first exhaust channel along the second direction B. The battery pack 100 also includes an explosion-proof valve 14, which is located on the housing 10 and is opposite to at least one end of the second exhaust channel 31 along the first direction A.

[0033] The housing 10 also includes a third sidewall 40 and a fourth sidewall 41 opposite each other along the second direction B. One end of a plurality of first exhaust channels is connected to the third sidewall 40, and the other end extends along the second direction B toward the fourth sidewall 41 and is spaced apart from the fourth sidewall 41. A second exhaust channel 31 extends along the first direction A and is disposed along the second direction B at the other end of the first exhaust channel adjacent to the fourth sidewall 41. In this embodiment, the battery pack 100 includes two explosion-proof valves 14, which are spaced apart along the first direction A on the fourth sidewall 41, and the two ends of the second exhaust channel 31 along the first direction A are respectively opposite to the two explosion-proof valves 14 along the second direction B.

[0034] Therefore, by placing the second exhaust channel 31 at one end of the first exhaust channel along the second direction B, and with the explosion-proof valve 14 facing at least one end of the second exhaust channel 31 along the first direction A, it is convenient to discharge the gas and heat in the other end of the multiple first exhaust channels near the fourth sidewall 41 from the explosion-proof valve 14, or to collect them at least at the end of the second exhaust channel 31 facing the explosion-proof valve 14, so that the gas and heat in the first exhaust channel are more concentratedly directed to the explosion-proof valve 14, thereby being discharged to the outside of the battery pack 100, reducing the impact on other components inside the battery pack 100, avoiding the spread of thermal runaway, and improving the safety of the battery pack 100.

[0035] According to some embodiments of the present invention, the explosion-proof valve 14 is disposed opposite to at least one end of the first exhaust channel along the second direction B.

[0036] In this embodiment, the other end of the first exhaust channel near the edge of the housing 10 along the second direction B, adjacent to the fourth sidewall 41, is respectively opposite to two explosion-proof valves 14. Thus, by having the explosion-proof valves 14 opposite to at least one end of the first exhaust channel along the second direction B, it is convenient to directly guide the heat and gas in the first exhaust channel near the edge of the housing 10 to the corresponding explosion-proof valve 14, and then conduct them to the outside of the battery pack 100 through the explosion-proof valves 14. This shortens the path for the heat and gas generated after the cell explosion to be conducted to the explosion-proof valves 14, improves the exhaust and heat dissipation efficiency of the battery pack 100 during thermal runaway, and enhances the reliability of the battery pack 100.

[0037] According to some embodiments of this utility model, such as Figure 1 As shown, the plurality of first exhaust channels include: an edge exhaust channel 21 and a middle exhaust channel 22. The edge exhaust channel 21 is disposed at the edge of the housing 10 along the first direction A; the middle exhaust channel 22 is disposed between the edge exhaust channels 21, and the second exhaust channel 31 is connected to the middle exhaust channel 22.

[0038] In this embodiment, the housing 10 also includes a fifth sidewall 42 and a sixth sidewall 43 opposite to each other along the first direction A. The plurality of first exhaust channels include two edge exhaust channels 21 and two intermediate exhaust channels 22. The two edge exhaust channels 21 are respectively disposed adjacent to the fifth sidewall 42 and the sixth sidewall 43 along the first direction A. The two intermediate exhaust channels 22 are disposed at intervals between the two edge channels along the first direction A. The second exhaust channel 31 is disposed at one end of the first exhaust channel adjacent to the fourth sidewall 41.

[0039] Therefore, the multiple first exhaust channels, including the edge exhaust channel 21 and the middle exhaust channel 22, can facilitate the first exhaust channels to fully cover the cell group 13 adjacent to the edge of the housing 10 and the middle part of the cell group 13. At the same time, through the second exhaust channel 31 connected to the middle exhaust channel 22, the heat and gas in the middle exhaust channel 22 along the second direction B near the other end of the fourth side wall 41 can be introduced into the second exhaust channel 31 and discharged at both ends of the second exhaust channel 31 along the first direction A. Then, they are discharged to the outside of the battery pack 100 through the corresponding explosion-proof valve 14, which improves the exhaust and heat dissipation efficiency of the battery pack 100 in the event of thermal runaway, reduces the use of the explosion-proof valve 14, and reduces costs.

[0040] According to some embodiments of this utility model, such as Figure 1 As shown, the two ends of the second exhaust channel 31 are respectively opposite to the same end of the edge exhaust channel 21 along the second direction B, and the explosion-proof valve 14 is opposite to the edge exhaust channel 21.

[0041] In this embodiment, the two explosion-proof valves 14 are respectively opposite to the other end of the two edge exhaust channels 21 along the second direction B near the fourth side wall 41, and the two ends of the second exhaust channel 31 along the first direction A are respectively opposite to the other end of the two edge exhaust channels 21 along the second direction B near the fourth side wall 41. The second exhaust channel 31 is perpendicular to the two edge exhaust channels 21.

[0042] Therefore, by aligning the two ends of the second exhaust channel 31 with the same end of the edge exhaust channel 21 along the second direction B, and with the explosion-proof valve 14 aligned with the edge exhaust channel 21, it is convenient to concentrate and guide the heat and gas in the edge exhaust channel 21 and the second exhaust channel 31 to the explosion-proof valve 14. At the same time, it is convenient to align the two ends of the second exhaust channel 31 along the first direction A with the corresponding explosion-proof valve 14, thereby improving the accuracy of the second exhaust channel 31 setting and increasing processing efficiency.

[0043] Optionally, the explosion-proof valve 14 may also be opposite to the intermediate exhaust channel 22. For example, two explosion-proof valves 14 may be opposite to two intermediate exhaust channels 22 along the second direction B. In this case, two second exhaust channels 31 are respectively located between the edge exhaust channel 21 adjacent to the fifth side wall 42 and the adjacent intermediate exhaust channel 22, and between the edge exhaust channel 21 adjacent to the sixth side wall 43 and the adjacent intermediate exhaust channel 22. One end of the second exhaust channel 31 along the first direction A is connected to the edge exhaust channel 21, and the other end of the second exhaust channel 31 along the first direction A is opposite to the other end of the intermediate exhaust channel 22 along the second direction B adjacent to the fourth side wall 41.

[0044] According to some embodiments of the present invention, the first exhaust channel and the explosion-proof valve 14 are arranged at intervals.

[0045] That is, the end of the first exhaust channel adjacent to the explosion-proof valve 14 along the second direction B is spaced apart from the explosion-proof valve 14 along the second direction B. Thus, by spaced apart from the explosion-proof valve 14, the first exhaust channel is connected to the cell assembly 13, while the length of the first exhaust channel can be shortened, reducing production costs. At the same time, it provides installation space for other components within the battery pack 100, facilitating the installation of other component systems within the battery pack 100.

[0046] Optionally, the second exhaust passage 31 is spaced apart from the explosion-proof valve 14.

[0047] That is, the second exhaust passage 31 is spaced apart from the explosion-proof valve 14 along the second direction B on the side adjacent to the explosion-proof valve 14. Thus, by spaced apart from the explosion-proof valve 14, the second exhaust passage 31 is connected to the intermediate exhaust passage 22, which facilitates the increased utilization of the internal space of the housing 10.

[0048] Optionally, the first exhaust passage and the explosion-proof valve 14 are spaced apart, and the second exhaust passage 31 and the explosion-proof valve 14 are also spaced apart.

[0049] According to some embodiments of the present invention, the battery pack 100 further includes a buffer member disposed between the side wall of the receiving cavity and the cell assembly 13.

[0050] A buffer element is disposed between the battery cell assembly 13 and one end of the plurality of first venting channels adjacent to each other, and the buffer element has a plurality of through holes formed thereon, each of which is opposite to a venting port. Alternatively, the buffer element is disposed between two adjacent venting ports, and the buffer element connects the first venting channels and the battery cell assembly 13 between the two venting ports. In this embodiment, the buffer element may be made of fireproof and heat-insulating foam or other flame-retardant materials.

[0051] Therefore, by placing the buffer between the side wall of the receiving cavity and the cell group 13, when a local cell of the cell group 13 experiences thermal runaway, the buffer can isolate fire and heat, prevent thermal runaway from spreading to adjacent cells, extend the service life of the battery pack 100, and effectively improve the safety and reliability of the battery pack 100.

[0052] According to some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the housing 10 includes a housing body 11 and a cover 12, the cover 12 and the housing body 11 defining a receiving cavity, the battery cell assembly 13 is disposed in the receiving cavity, and the cover 12 is provided with a first exhaust channel and a second exhaust channel 31.

[0053] The first exhaust channel and the second exhaust channel 31 are provided on the side surface of the cover 12 adjacent to the cell assembly 13, that is, on the side surface of the first sidewall adjacent to the second sidewall. The cell assembly 13 is provided on the side surface of the shell body 11 adjacent to the cover 12 along the height direction of the shell 10, that is, on the side surface of the second sidewall adjacent to the first sidewall. The cover 12 and the shell body 11 are respectively provided with multiple through holes 121 along the circumferential direction on the side adjacent to each other along the height direction of the battery pack 100. The fasteners are engaged with the multiple through holes 121 to realize the assembly of the shell 10 and the connection between the first exhaust channel and the explosion vent of the cell assembly 13.

[0054] Therefore, by providing a first exhaust channel and a second exhaust channel 31 on the cover 12, and integrating the first exhaust channel and the second exhaust channel 31 together on the cover 12, the structural strength of the cover 12 can be improved, the damage to the cover 12 of the battery pack 100 during the explosion of the battery cell group 13 can be avoided, the reliability of the housing 10 can be improved, and the integrated design of the battery pack 100 can be realized, reducing the space occupied by the first exhaust channel and the second exhaust channel 31.

[0055] According to some embodiments of this utility model, such as Figure 1 As shown, the cover 12 has a channel 15 on the side facing the shell body 11, and the channel 15 forms a first exhaust channel and a second exhaust channel 31; the channel 15 and the cover 12 are integrally formed.

[0056] The channel component 15 includes a first channel component 20 and a second channel component 30. The first channel component 20 forms a first exhaust channel, and the second channel component 30 forms a second exhaust channel 31. The first channel component 20 includes a first sub-wall and two second sub-walls. The first sub-wall is spaced apart from the cover 12 along the height direction of the battery pack 100 and extends along the second direction B. A plurality of exhaust holes 201 are formed on the first sub-wall along the second direction B. The plurality of exhaust holes 201 are adapted to be opposite to a plurality of explosion vents of the cell assembly 13. The two second sub-walls extend along the second direction B and are disposed between the first sub-wall and the cover 12 along the height direction of the battery pack 100. The two second sub-walls are respectively disposed on both sides of the first sub-wall along the first direction A. The second channel member 30 includes a third sub-wall and two fourth sub-walls. The third sub-wall is spaced apart from the cover 12 along the height direction of the battery pack 100 and extends along the first direction A. The two fourth sub-walls extend along the first direction A and are located between the third sub-wall and the cover 12 along the height direction of the battery pack 100. The two fourth sub-walls are respectively located on both sides of the third sub-wall along the second direction B. The fourth sidewall 41 forms two connecting openings on the side of the first channel member 20 along the second direction B adjacent to the first channel member 20. The two intermediate exhaust channels 22 formed by the first channel member 20 are connected to the second exhaust channel 31 formed by the second channel member 30 through the two connecting openings at the other end of the first channel member 20 adjacent to the fourth sidewall 41 along the second direction B. The cross-sectional shape of the first channel member 20 and the second channel member 30 is Z-shaped to give the first channel member 20 and the second channel member 30 high structural strength and facilitate the formation of exhaust channels.

[0057] In this embodiment, the channel component 15 and the cover 12 are integrally formed. Therefore, the channel component 15 and the cover 12 can be manufactured and processed as a whole, which can improve the structural strength of the cover 12 and the channel component 15, improve the stability and reliability of the first exhaust channel and the second exhaust channel 31, reduce the processing difficulty, reduce the production cost, and at the same time, reduce the weight of the cover 12 and the channel component 15, thus achieving a lightweight design.

[0058] Optionally, the channel component 15 is welded to the cover 12. That is, the two second sub-walls and the two fourth sub-walls are welded to the cover 12 along the height direction of the battery pack 100 on one side adjacent to the cover 12, and the channel component 15 and the cover 12 define the first venting channel and the second venting channel 31. This can improve the connection strength and sealing between the channel component 15 and the cover 12, and improve the reliability of the battery pack 100.

[0059] Optionally, a buffer is provided between the first channel component 20 and the cell assembly 13. This can fill the gaps between the cell assembly 13 and the multiple first channel components 20, ensuring a tight fit between the cell assembly 13 and the multiple first channel components 20, improving sealing performance. At the same time, when a local cell in the cell assembly 13 experiences thermal runaway, it prevents the thermal propagation of the cell, thereby improving the safety and reliability of the battery pack 100.

[0060] The energy storage device according to a second aspect of the present invention includes the battery pack 100 in the above embodiment.

[0061] The energy storage device includes multiple battery packs 100. By integrating the first exhaust channel and the second exhaust channel 31 on the cover 12 of the battery pack 100, when the cell group 13 experiences thermal runaway, heat and gas enter the multiple first exhaust channels through the explosion vent and the exhaust hole 201 of the channel component 15, or flow to the second exhaust channel 31 through the first exhaust channel, and finally be discharged to the outside of the battery pack 100 through the explosion-proof valve 14. At the same time, a buffer component is set between the first channel component 20 and the cell group 13 to avoid heat spread, extend the service life of the energy storage device, and effectively improve the safety and reliability of the energy storage device.

[0062] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0063] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "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.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0065] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: The housing has a receiving cavity, and a plurality of first exhaust channels and at least one second exhaust channel are formed on one side wall of the receiving cavity. The second exhaust channel intersects with and communicates with at least two of the plurality of first exhaust channels. At least one battery cell assembly is disposed within the receiving cavity. The first exhaust channel extends along the arrangement direction of the battery cell assembly. The battery cell assembly is provided with at least one explosion vent, which is disposed facing the first exhaust channel and is connected to the first exhaust channel.

2. The battery pack according to claim 1, characterized in that, The plurality of first exhaust channels are arranged along a first direction and extend along a second direction, and the second exhaust channel is located at one end of the first exhaust channel along the second direction; It also includes: an explosion-proof valve, which is disposed on the housing and is opposite to at least one end of the second exhaust passage along the first direction.

3. The battery pack according to claim 2, characterized in that, The explosion-proof valve is disposed opposite to at least one end of the first exhaust channel along the second direction.

4. The battery pack according to claim 2, characterized in that, The plurality of first exhaust passages include: An edge exhaust channel is provided along the edge of the housing in a first direction; A central exhaust channel is provided between the edge exhaust channels, and the second exhaust channel is connected to the central exhaust channel.

5. The battery pack according to claim 4, characterized in that, The two ends of the second exhaust channel are respectively opposite to the same end of the edge exhaust channel along the second direction, and the explosion-proof valve is opposite to the edge exhaust channel.

6. The battery pack according to claim 2, characterized in that, The first exhaust channel and the explosion-proof valve are spaced apart; and / or, The second exhaust channel is spaced apart from the explosion-proof valve.

7. The battery pack according to claim 1, characterized in that, Also includes: A buffer element is disposed between the side wall of the receiving cavity and the battery cell assembly.

8. The battery pack according to any one of claims 1-7, characterized in that, The housing includes: Shell body; The cover and the shell body define the receiving cavity, the battery cell assembly is disposed in the receiving cavity, and the cover is provided with a first exhaust channel and a second exhaust channel.

9. The battery pack according to claim 8, characterized in that, The cover is provided with a channel component on the side facing the shell body, and the channel component forms the first exhaust channel and the second exhaust channel; The channel component and the cover are integrally formed; or... The channel component is welded to the cover.

10. An energy storage device, characterized in that, Includes the battery pack according to any one of claims 1-9.

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