Battery device

Abstract

The utility model discloses a battery device. The battery device comprises a shell, a plurality of battery cell groups and at least one protection piece, wherein an accommodating cavity is formed in the shell; the plurality of battery cell groups are arranged in the accommodating cavity, the plurality of battery cell groups are arranged along a first direction, each battery cell group comprises a plurality of battery cells, and the anti-explosion valve of each battery cell is positioned on the same side of the battery cell group; each protection part is positioned between the two battery cell groups, one side of one battery cell group, which is provided with the anti-explosion valve, is supported on the surface of one side of the protection part, and one side of the other battery cell group, which is not provided with the anti-explosion valve, is supported on the surface of the other side of the protection part. Through the arrangement, when one battery cell group is subjected to thermal runaway and the anti-explosion valve is opened to evacuate heat flow, the adjacent battery cell groups and the battery cell group subjected to thermal runaway are separated through the arrangement of the protection parts, and the heat flow is prevented from directly acting on the adjacent battery cell groups, so that the impact of the heat flow of the battery cell group subjected to thermal runaway on the adjacent battery cell groups can be reduced; and the risk of thermal runaway of the adjacent battery cell groups and the whole battery device is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle battery, in particular to a battery device. BACKGROUND

[0002] In today's modern technology continues to develop, vehicles have become an essential tool for people to travel, battery device is the core component of the vehicle, which plays an important role in providing power for the vehicle, in recent years, with the frequent occurrence of vehicle safety accidents, people pay attention to the safety of the battery device.

[0003] The vehicle battery device is usually composed of multiple cell groups. When the battery device is in thermal runaway, high-temperature and high-pressure heat flow will be generated. Therefore, an explosion-proof valve is usually arranged on the cell group to dissipate the heat flow. In the battery structure with multiple stacked cell groups, the explosion-proof valve of the lower cell group is directly opposite to the bottom of the upper cell group, which causes the cell group to be easily affected by the thermal runaway of the adjacent cell group, thereby aggravating the risk of thermal runaway of the battery device. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the present application is to provide a battery device, which aims to solve the above technical problems existing in the prior art.

[0005] To solve the above problems, the present application provides a battery device, which comprises a shell, a plurality of cell groups, and at least one protective member. The shell forms a receiving cavity. The plurality of cell groups are arranged in the receiving cavity. The plurality of cell groups are arranged along a first direction. Each cell group comprises a plurality of cells. The explosion-proof valve of each cell is located on the same side of the cell group. Each protective member is located between two cell groups. One side of a cell group with an explosion-proof valve is supported on one side surface of the protective member. The other side of another cell group without an explosion-proof valve is supported on the other side surface of the protective member.

[0006] Preferably, the protective member comprises a fireproof member and a support member. The fireproof member is supported on one side of the cell group with the explosion-proof valve. One side of the support member is supported on the fireproof member. The other side of the support member is in contact with the side of another adjacent cell group without an explosion-proof valve.

[0007] Preferably, the support member comprises a support beam and a support plate. The support beam has a support beam cavity. The support plate and the fireproof member are arranged at intervals. The support beam is located between the support plate and the fireproof member.

[0008] Preferably, the number of support beams is a plurality. The plurality of support beams are arranged at intervals in a second direction perpendicular to the first direction, so that a first heat dissipation cavity is formed between two adjacent support beams.

[0009] Preferably, the cavity ratio between the first heat dissipation cavity and the support plate and the fireproof piece is greater than or equal to 75%.

[0010] Preferably, the fireproof piece comprises a fireproof blanket and an elastic fixing piece, the elastic fixing piece is fixed to one side of the battery cell group with the explosion-proof valve, and the fireproof blanket is fixed to the elastic fixing piece and in contact with the support piece.

[0011] Preferably, the number of the elastic fixing pieces is multiple, and multiple elastic fixing pieces are arranged in a second direction perpendicular to the first direction, so that a second heat dissipation cavity is formed between adjacent two elastic fixing pieces.

[0012] Preferably, the elastic fixing piece is arranged corresponding to the support beam in the second direction, and the number of the elastic fixing pieces is consistent with the number of the support beams.

[0013] Preferably, the size of the elastic fixing piece in a third direction perpendicular to the second direction is greater than or equal to the size of the battery cell group.

[0014] Preferably, in the third direction, both sides of the plurality of battery cell groups in the accommodating cavity are provided with heat dissipation channels extending in the first direction.

[0015] Compared with the prior art, the battery device of the present application comprises a shell, a plurality of battery cell groups, and at least one protective piece, the shell is formed with an accommodating cavity; the plurality of battery cell groups are arranged in the accommodating cavity, and the plurality of battery cell groups are arranged in a first direction, each battery cell group comprises a plurality of battery cells, and the explosion-proof valve of each battery cell is located on the same side of the battery cell group; each protective piece is located between two battery cell groups, one side of the battery cell group with the explosion-proof valve is supported on one side surface of the protective piece, and the other side of the battery cell group without the explosion-proof valve is supported on the other side surface of the protective piece. Through the above arrangement, when thermal runaway occurs in one battery cell group, the explosion-proof valves on the plurality of battery cells on the battery cell group are opened to dissipate heat flow, because the protective piece is arranged to separate the adjacent battery cell groups and the battery cell group with thermal runaway, the heat flow first impacts on the protective piece, avoiding the heat flow of the battery cell group with thermal runaway directly acting on the adjacent battery cell group, and the protective piece plays a buffering role on the heat flow impact, so as to reduce the impact of the heat flow of the battery cell group with thermal runaway on the adjacent battery cell group, and further reduce the risk of thermal runaway of the adjacent battery cell group and the whole battery device. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 is a first perspective view of an embodiment of the battery device provided in the present application;

[0018] Figure 2 is a second perspective view of the battery device shown in Figure 1

[0019] Figure 3a is a cross-sectional view of the battery device along the A-A line shown in Figure 2 Figure 3b Figure 3a is an enlarged view of the battery device shown in the dashed box in

[0020] Figure 4 is an exploded view of the battery device shown in Figure 1

[0021] Figure 5 is an enlarged view of the battery device shown in the dashed box in Figure 4

[0022] Figure 6 is a third perspective view of the battery device shown in Figure 1

[0023] Reference signs: battery device 1; housing 10; accommodating cavity 110; heat dissipation channel 111; battery cell group 20; protection member 30; fireproof member 310; fireproof blanket 311; elastic fixing member 312; support member 320; support beam 321; support beam cavity 3210; support plate 322; first heat dissipation cavity 330; second heat dissipation cavity 340; box explosion-proof valve 40; first direction X; second direction Y; third direction Z. DETAILED DESCRIPTION

[0024] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0026] ​​​​​​In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0027] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0029] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0030] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0031] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] The vehicle battery device is usually composed of a plurality of battery cell groups. When the battery device is in thermal runaway, high-temperature and high-pressure heat flow is generated. Therefore, an explosion-proof valve is usually arranged on the battery cell group to dissipate the heat flow. In the battery structure with a plurality of stacked battery cell groups, the explosion-proof valve of the lower battery cell group is directly opposite to the bottom of the upper battery cell group 20. This causes the battery cell group to be easily affected by the thermal runaway of the adjacent battery cell group, thereby increasing the risk of thermal runaway of the battery device.

[0033] To solve the technical problems in the related art, the present application provides a battery device. Referring to Figures 1 to 3b , Figure 1 is a first perspective structural schematic diagram of an embodiment of the battery device provided by the present application, Figure 2 is Figure 1 a second perspective structural schematic diagram of the battery device shown in Figure 3a is Figure 2 a cross-sectional structural schematic diagram of the battery device shown in along the A-A tangent, Figure 3b is Figure 3a an enlarged structural schematic diagram in the dashed box in

[0034] The battery device 1 comprises a shell 10, a plurality of battery cell groups 20, and at least one protective piece 30. The shell 10 is formed with a receiving cavity 110. The plurality of battery cell groups 20 are arranged in the receiving cavity 110. The plurality of battery cell groups 20 are arranged along a first direction X. Each battery cell group 20 comprises a plurality of battery cells. The explosion-proof valve of each battery cell is located on the same side of the battery cell group 20. Each protective piece 30 is located between two battery cell groups 20. One side of one battery cell group 20 with an explosion-proof valve is supported on one side surface of the protective piece 30. The other side of the other battery cell group 20 without an explosion-proof valve is supported on the other side surface of the protective piece 30.

[0035] The battery device 1 is usually composed of a plurality of battery cell groups 20, and each battery cell group 20 is composed of a plurality of battery cells. When the battery cell is in thermal runaway, high-temperature and high-pressure heat flow is generated inside the battery cell. Therefore, an explosion-proof valve is arranged on the battery cell to dissipate the heat flow. In the first direction X, the explosion-proof valve of one battery cell group 20 is directly opposite to the side of the adjacent battery cell group 20 without an explosion-proof valve. This causes the heat flow generated by the thermal runaway of the battery cell group 20 to impact the adjacent battery cell group 20, which easily causes the thermal runaway of the adjacent battery cell group 20. By arranging the protective piece 30 between the two adjacent battery cell groups 20, the two adjacent battery cell groups 20 are spaced apart. Therefore, when one battery cell group 20 is in thermal runaway, the heat flow discharged through the explosion-proof valve will first impact the protective piece 30, avoiding the direct action of the heat flow on the adjacent battery cell group 20, thereby reducing the risk of thermal runaway of the adjacent battery cell group 20 caused by the influence of the thermal runaway battery cell group 20. The surface area of the protective piece 30 in contact with the battery cell group 20 is greater than the surface area of the battery cell group 20, so as to further prevent the heat flow of the thermal runaway battery cell group 20 from directly impacting the adjacent battery cell group 20.

[0036] The protection piece 30 comprises a fireproof piece 310 and a support piece 320, the fireproof piece 310 is supported on one side of the battery cell group 20 with the explosion-proof valve, and the support piece 320 is supported on one side of the fireproof piece 310 and the other side of the support piece 320 is in contact with the side of the other adjacent battery cell group 20 without the explosion-proof valve.

[0037] Because the fireproof piece 310 is adjacent to the explosion-proof valve on the battery cell group 20, the heat flow generated by the thermal runaway of the battery cell group 20 first impacts on the fireproof piece 310, and the fireproof piece 310 plays a first layer of buffering role to the heat flow impact, secondly, the fireproof piece 310 can reduce the risk of fire, and the support piece 320 can play a supporting role to the adjacent battery cell group 20 on the one hand, and on the other hand, the support piece 320 can play a second layer of buffering role to the heat flow generated by the thermal runaway of the battery cell group 20, further reducing the risk of thermal runaway of the adjacent battery cell group 20 due to the heat flow impact of the thermal runaway battery cell group 20.

[0038] Referring again to Figure 4 and Figure 5 , Figure 4 is Figure 1 the explosion view of the battery device shown in FIG. 1, Figure 5 is Figure 4 the enlarged structure diagram in the dashed box of the battery device shown in FIG. 1.

[0039] The support piece 320 comprises a support beam 321 and a support plate 322, the support beam 321 has a support beam cavity 3210, the support plate 322 and the fireproof piece 310 are arranged at intervals, and the support beam 321 is located between the support plate 322 and the fireproof piece 310. The support beam 321 is supported on the fireproof piece 310, and the support plate 322 is further supported on the support beam 321. The surface area of the support plate 322 is larger than the surface area of the battery cell group 20, so that the adjacent battery cell group 20 can be stably supported and fixed on the support plate 322. The inside of the support beam 321 is hollow to form the support beam cavity 3210, which can assist in dissipating the heat generated by the support piece 320 due to the heat flow impact of the thermal runaway of the battery cell group 20, thereby reducing the heat transferred to the adjacent battery cell group 20. The support beam 321 can be a metal beam, and the support plate 322 can be a metal plate. The support beam 321 and the support plate 322 can be fixed by bolts, and the support plate 322 and the battery cell group 20 can be fixed by glue.

[0040] The number of support beams 321 is multiple, and the multiple support beams 321 are arranged at intervals in the second direction Y perpendicular to the first direction X, so that the first heat dissipation cavity 330 is formed between two adjacent support beams 321. The support beams 321 are arranged at intervals, and the first heat dissipation cavity 330 is located between two adjacent support beams 321 in the second direction Y, while the first heat dissipation cavity 330 intervals the support plate 322 and the fireproof part 310 in the first direction X. The first heat dissipation cavity 330 helps to dissipate heat due to heat flow transmission caused by thermal runaway of the battery cell group 20. The number of support beams 321 can be 3, 4, etc. It should be noted that the support beam 321 will occupy a certain volume, which will squeeze the volume of the first heat dissipation cavity 330. Therefore, the number of support beams 321 and the volume of the first heat dissipation cavity 330 need to be balanced and set, which is adjusted according to the actual situation.

[0041] The cavity ratio between the first heat dissipation cavity 330 and the support plate 322 and the fireproof part 310 is greater than or equal to 75%. The volume of the support beam 321 and the volume of the first heat dissipation cavity 330 together occupy the cavity between the support plate 322 and the fireproof part 310. In order to ensure the heat dissipation effect, the volume of the first heat dissipation cavity 330 occupying the cavity between the support plate 322 and the fireproof part 310 should be greater than or equal to 75%.

[0042] The fireproof part 310 includes a fireproof blanket 311 and an elastic fixing part 312. The elastic fixing part 312 is fixed to one side of the battery cell group 20 having the explosion-proof valve. The fireproof blanket 311 is fixed to the elastic fixing part 312, and the fireproof blanket 311 is in contact with the support part 320. The elastic fixing part 312 is used to fixedly connect the fireproof blanket 311 and the side of the battery cell group 20 having the explosion-proof valve, so as to avoid that the heat flow will flush the fireproof blanket 311 to other positions when the battery cell group 20 is in thermal runaway. The fireproof blanket 311 and the support beam 321 can be connected by glue, further fixing the fireproof blanket 311. The surface area of the fireproof blanket 311 is greater than the surface area of the battery cell group 20. The fireproof blanket 311 has the functions of resisting heat flow impact and preventing fire. It should be noted that the elastic fixing part 312 is arranged away from the position of the explosion-proof valve, so as not to affect the explosion-proof valve of the battery cell group 20 to dissipate heat flow. The elastic fixing part 312 is made of a material with small thermal conductivity and poor thermal conductivity. Specifically, the elastic fixing part 312 can be foam.

[0043] The number of elastic fixing parts 312 is multiple, and the multiple elastic fixing parts 312 are arranged at intervals in the second direction Y perpendicular to the first direction X, so that the second heat dissipation cavity 340 is formed between two adjacent elastic fixing parts 312. The multiple elastic fixing parts 312 are arranged at intervals, so that a certain cavity, i.e. the second heat dissipation cavity 340, is left between the fireproof blanket 311 and the side of the battery cell group 20 having the explosion-proof valve. The second heat dissipation cavity 340 can dissipate heat generated by heat flow impact, and the second heat dissipation cavity 340 can also avoid the explosion-proof valve on the battery cell group 20.

[0044] The elastic fixing member 312 is arranged corresponding to the support beam 321 in the second direction Y, the number of the elastic fixing member 312 is consistent with the number of the support beam 321, which makes the elastic fixing member 312 not extrude the volume of the first heat dissipation cavity 330, so as to affect the heat dissipation effect of the first heat dissipation cavity 330, it is necessary to note that the elastic fixing member 312 needs to avoid the explosion-proof valve on the battery cell group 20, so as to avoid affecting the normal work of the explosion-proof valve, and avoid affecting the effect of the battery cell group 20 on the heat flow.

[0045] The size of the elastic fixing member 312 in the third direction Z perpendicular to the second direction Y is greater than or equal to the size of the battery cell group 20. Because the elastic fixing member 312 is connected with the side of the battery cell group 20 with the explosion-proof valve, it needs to avoid the explosion-proof valve, and at the same time, in order to avoid the elastic fixing member 312 extruding the volume of the first heat dissipation cavity 330, the size of the elastic fixing member 312 in the second direction Y is limited, the length of the elastic fixing member 312 in the third direction Z is at least consistent with the length of the battery cell group 20, so as to ensure the stability of the connection between the fire blanket 311 and the battery cell group 20, the length of the elastic fixing member 312 in the third direction Z can also be slightly greater than the length of the battery cell group 20, and at the same time, the support beam 321 and the shell 10 are fixedly connected through bolts in the third direction Z, so that the battery cell group 20 is more stable.

[0046] Referring to Figure 6 , Figure 6 is Figure 1 the third perspective structural schematic diagram of the battery device.

[0047] In the third direction Z, the two sides of the plurality of battery cell groups 20 in the accommodating cavity 110 are provided with heat dissipation channels 111, the heat dissipation channels 111 are arranged extending in the first direction X, because the heat flow generated when the battery cell group 20 is out of control is blocked by the fire blanket 311 when it impacts in the first direction X, so that the heat flow changes direction, so that the heat flow enters the heat dissipation channels 111 on the two sides of the battery cell group 20 in the third direction Z through the second heat dissipation cavity 340, and for the same reason, the heat flow generated in the first heat dissipation cavity 330 because of the heat transfer of the explosion-proof valve heat flow of the battery cell group 20 can also be transferred to the heat dissipation channel 111, it is necessary to note that the shell 10 of the battery device 1 is also provided with a tank explosion-proof valve 40, so that the heat flow entering the heat dissipation channel 111 is transferred in the first direction X and then discharged from the inside of the battery device 1 through the tank explosion-proof valve 40 on the shell 10, at the same time, in order to ensure the effect of heat dissipation, the volume occupied by the heat dissipation channel 111 should be greater than or equal to 30% of the volume of the accommodating cavity 110 inside the shell 10.

[0048] In summary, the battery device 1 of the present application separates the explosion-proof valve on the cell group 20 and the adjacent cell group 20 by setting the protection piece 30, so as to avoid the direct action of the thermal flow on the adjacent cell group 20 when the cell group 20 is in thermal runaway. The setting of the fire blanket 311 forms the first layer of barrier against the thermal flow impact. The support piece 320 composed of the support beam 321 and the support plate 322 forms the second layer of barrier against the thermal flow impact. Meanwhile, the support piece 320 also plays the role of supporting the cell group 20. The setting of the support beam 321 makes the first heat dissipation cavity 330 formed between the support plate 322 and the fire blanket 311. The first heat dissipation cavity 330 can dissipate the heat generated due to the thermal flow impact, so as to reduce the mutual influence of the adjacent cell groups 20 of the battery device 1 in thermal runaway, and further reduce the risk of thermal runaway of the entire battery device 1.

[0049] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, The battery device includes: The shell has a receiving cavity; Multiple battery cell groups are disposed within the receiving cavity and arranged along a first direction. Each battery cell group includes multiple battery cells, and the explosion-proof valve of each battery cell is located on the same side of the battery cell group. At least one protective element, each of the protective elements being located between two of the battery cell groups, one of the battery cell groups having the explosion-proof valve on one side of the protective element, and the other battery cell group not having the explosion-proof valve on the other side of the protective element.

2. The battery device according to claim 1, characterized in that, The protective component includes a fireproof component and a support component. The fireproof component is supported on one side of one of the battery cell groups that has the explosion-proof valve. One side of the support component is supported on the fireproof component, and the other side of the support component is in contact with the side of another adjacent battery cell group that does not have the explosion-proof valve.

3. The battery device according to claim 2, characterized in that, The support member includes a support beam and a support plate. The support beam has a support beam cavity. The support plate and the fireproof component are spaced apart. The support beam is located between the support plate and the fireproof component.

4. The battery device according to claim 3, characterized in that, The number of support beams is multiple, and the multiple support beams are spaced apart in a second direction perpendicular to the first direction, so that a first heat dissipation cavity is formed between two adjacent support beams.

5. The battery device according to claim 4, characterized in that, The cavity between the first heat dissipation cavity and the support plate and the fireproof component accounts for more than or equal to 75%.

6. The battery device according to claim 3, characterized in that, The fireproof component includes a fireproof blanket and an elastic fastener. The elastic fastener is fixed to one side of the battery cell assembly having the explosion-proof valve. The fireproof blanket is fixed to the elastic fastener, and the fireproof blanket is in contact with the support.

7. The battery device according to claim 6, characterized in that, The number of elastic fasteners is multiple, and the multiple elastic fasteners are spaced apart in a second direction perpendicular to the first direction, so that a second heat dissipation cavity is formed between two adjacent elastic fasteners.

8. The battery device according to claim 7, characterized in that, The elastic fasteners are provided in the second direction corresponding to the support beams, and the number of elastic fasteners is the same as the number of support beams.

9. The battery device according to claim 7, characterized in that, The dimension of the elastic fastener in a third direction perpendicular to the second direction is greater than or equal to the dimension of the battery cell assembly.

10. The battery device according to claim 9, characterized in that, In the third direction, heat dissipation channels are provided on both sides of the plurality of battery cell groups in the receiving cavity, and the heat dissipation channels extend in the first direction.

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