Battery pack

Abstract

The utility model discloses a battery pack which has a first direction, a second direction and a third direction which are intersected in pairs, the battery pack comprises a connecting piece and a plurality of battery cells, the connecting piece is used for connecting pole columns of two adjacent battery cells, the connecting piece comprises a connecting piece and a heat dissipation structure, the area, connected with the pole columns, of the connecting piece is a fixed area, and the heat dissipation structure is arranged in the fixed area. The areas, outside the fixing area, of the connecting piece are all heat dissipation areas, the heat dissipation structures are evenly distributed on the heat dissipation areas, each heat dissipation structure comprises a heat dissipation piece and first heat dissipation fins, the heat dissipation pieces are arranged on the heat dissipation areas, and the first heat dissipation fins are arranged on the heat dissipation pieces. A plurality of first cooling fins are arranged on at least one side, in the second direction, of the cooling piece at intervals in the first direction, and the first cooling fins extend in the third direction. The heat dissipation efficiency of the connecting piece can be improved, and the heat transferred into the battery cell by the connecting piece can be reduced, so that the adverse effect on the performance of the battery cell is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and particularly relates to a battery pack. Background Art

[0002] At present, in the field of power cells, in order to obtain a larger output current and output voltage, multiple cells are often assembled together to form a battery module. The cells in the battery module are connected in series or in parallel through connecting pieces.

[0003] Due to the material properties of the connecting piece itself, the connecting piece has a certain resistance. When current passes through, the connecting piece will generate a certain amount of heat. The amount of heat generated by the connecting piece is related to the magnitude of the current passing through. The larger the current, the more heat is generated. Under normal working conditions, the temperature range that the cell can tolerate is -20°C - 60°C. When the temperature generated by the connecting piece is too high, heat dissipation treatment is required. Otherwise, the heat of the connecting piece will be transferred to the inside of the cell and have an adverse effect on the cell performance. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery pack with good heat dissipation effect.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A battery pack has a first direction, a second direction, and a third direction that intersect pairwise, and includes a connecting piece and multiple cells. The connecting piece is used to connect the pole columns of two adjacent cells. The connecting piece includes a connecting sheet and a heat dissipation structure. The area on the connecting sheet for connecting the pole column is a fixed area, and the area on the connecting sheet outside the fixed area is a heat dissipation area. The heat dissipation structures are evenly distributed on the heat dissipation area. The heat dissipation structure includes a heat dissipation member and a first heat dissipation fin. The heat dissipation member is arranged on the heat dissipation area. On at least one side of the heat dissipation member in the second direction, a plurality of first heat dissipation fins are arranged at intervals in the first direction, and the first heat dissipation fins extend in the third direction.

[0007] Preferably, the heat dissipation member is a heat dissipation plate. A plurality of the heat dissipation plates are arranged at intervals in the second direction on the connecting sheet, and the heat dissipation plates extend in the third direction.

[0008] Preferably, the heat dissipation structure further includes a second heat dissipation fin. On at least one side of the first heat dissipation fin in the first direction, a plurality of second heat dissipation fins are arranged at intervals in the second direction, and the second heat dissipation fins extend in the first direction.

[0009] Preferably, the heat dissipation plate, the first heat dissipation fin, and the second heat dissipation fin are integrally formed.

[0010] Preferably, the heat dissipation member is a heat dissipation column, and a plurality of the heat dissipation columns are provided and uniformly distributed on the heat dissipation area.

[0011] Preferably, the heat dissipation column is in the shape of a cuboid, a triangular prism or a cylinder.

[0012] Preferably, the connecting piece and the heat dissipation structure are copper sheets or aluminum sheets.

[0013] Preferably, the part of the connecting piece located in the fixing area is an aluminum sheet, and the part of the connecting piece located in the heat dissipation area is a copper sheet.

[0014] Preferably, it further includes a box body and a cover body. An opening is provided on one side of the box body, and the cover body is covered on the opening of the box body. A plurality of the battery cells are arranged in the box body, and the pole columns of two adjacent battery cells are connected through the connecting piece.

[0015] Preferably, the distance between two sides of the connecting piece in the first direction is a, the distance between two sides of the heat dissipation structure in the first direction is b, and the distance between the connecting piece and the cover body in the first direction is c, wherein a + b < c.

[0016] Compared with the prior art, the battery pack according to the embodiment of the present invention has the following beneficial effects:

[0017] In the present invention, the area on the connecting piece corresponding to the pole column is the fixing area, and the area on the connecting piece outside the fixing area is the heat dissipation area. Then, the heat dissipation structure is uniformly distributed in the heat dissipation area. The heat dissipation structure includes a heat dissipation member provided on the heat dissipation area of the connecting piece to have a primary heat dissipation effect. Then, a plurality of first heat dissipation fins are arranged at intervals along the first direction on at least one side of the heat dissipation member in the second direction, and the first heat dissipation fins extend along the third direction to have a secondary heat dissipation effect, increasing the heat dissipation area, thereby improving the heat dissipation efficiency. Therefore, the heat transferred to the battery cell through the connecting piece can be reduced, and the adverse effect on the performance of the battery cell can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic connection diagram of the connecting piece and the battery cell according to the embodiment of the present invention;

[0019] Figure 2 is an exploded view of the connecting piece and the battery cell according to the embodiment of the present invention;

[0020] Figure 3 is a side view of the connecting piece and the battery cell according to the embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of the connecting piece according to an embodiment of the present invention;

[0022] Figure 5 is a top view of a connecting member according to one embodiment of the embodiment of the present utility model;

[0023] Figure 6 is a schematic diagram showing the relationship among a heat dissipation plate, a first heat sink, and a second heat sink according to one embodiment of the embodiment of the present utility model;

[0024] Figure 7 is a schematic diagram of a connecting member according to another embodiment of the embodiment of the present utility model;

[0025] Figure 8 is a top view of a connecting member according to another embodiment of the embodiment of the present utility model;

[0026] Figure 9 is a schematic structural diagram of a battery pack according to the embodiment of the present utility model.

[0027] In the figure, 1 is a connecting piece; 11 is a fixing area; 12 is a heat dissipation area; 2 is a heat dissipation structure; 21 is a heat dissipation member; 211 is a heat dissipation plate; 212 is a heat dissipation column; 22 is a first heat sink; 23 is a second heat sink; 3 is a box body; 4 is a cover body; 5 is an electric core. Detailed Embodiment

[0028] The following further describes in detail the specific embodiments of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model but are not used to limit the scope of the present utility model.

[0029] In the description of the present utility model, it should be understood that the term "comprising" used in the specification of the present utility model means the presence of the described features, integers, steps, operations, components and / or assemblies, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components, assemblies and / or their groups. It should be understood that when we say a component is "connected" to another component, it can be directly connected to other components, or there may also be intermediate components. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0030] Such as Figures 1 to 9As shown in the figure, the present utility model relates to a battery pack, which has a first direction, a second direction, and a third direction that intersect pairwise. It includes a connecting member and a plurality of battery cells 5. The connecting member is used to connect the pole columns of two adjacent battery cells 5. The connecting member includes a connecting piece 1 and a heat dissipation structure 2. The area on the connecting piece 1 for connecting the pole columns is a fixed area 11, and the area on the connecting piece 1 outside the fixed area 11 is a heat dissipation area 12. The heat dissipation structures 2 are evenly distributed on the heat dissipation area 12. The heat dissipation structure 2 includes a heat dissipation member 21 and a first heat dissipation fin 22. The heat dissipation member 21 is arranged on the heat dissipation area 12. At least one side of the heat dissipation member 21 in the second direction is provided with a plurality of first heat dissipation fins 22 at intervals in the first direction, and the first heat dissipation fins 22 extend in the third direction.

[0031] In the present utility model, the area on the connecting piece 1 corresponding to the pole column is the fixed area 11, and the area on the connecting piece 1 outside the fixed area 11 is the heat dissipation area 12. Then, the heat dissipation structures 2 are evenly distributed in the area of the heat dissipation area 12. The heat dissipation structure 2 includes a heat dissipation member 21 arranged on the heat dissipation area 12 of the connecting piece 1 to have a primary heat dissipation effect. Then, at least one side of the heat dissipation member 21 in the second direction is provided with a plurality of first heat dissipation fins 22 at intervals in the first direction, and the first heat dissipation fins 22 extend in the third direction to have a secondary heat dissipation effect, increasing the heat dissipation area, thereby improving the heat dissipation efficiency. Therefore, the heat transferred from the connecting member to the battery cell 5 can be reduced, thereby reducing the adverse impact on the performance of the battery cell 5.

[0032] It should be emphasized that the shape of the fixed area 11 corresponds to the shape of the pole column, and the heat dissipation structures 2 are provided in the outer area of the fixed area 11 in the circumferential direction, thereby ensuring that the connecting member has a better heat dissipation effect.

[0033] Specifically, the heat dissipation structure 2 of the connecting piece 1 of the present application can be provided on the side of the connecting piece 1 in the first direction and facing away from the battery cell 5, or on the side of the connecting piece 1 in the first direction and facing the battery cell 5, or on both sides of the connecting piece 1 in the first direction. All three methods can achieve rapid heat dissipation of the connecting piece 1.

[0034] In this embodiment, the heat dissipation member 21 is a heat dissipation plate 211. A plurality of the heat dissipation plates 211 are arranged on the connecting piece 1 at intervals in the second direction, and the heat dissipation plates 211 extend in the third direction.

[0035] Specifically, a plurality of the heat dissipation plates 211 are provided on the connecting piece 1 at intervals in the second direction. On both sides of each heat dissipation plate 211 in the second direction, a plurality of first heat dissipation fins 22 are provided at intervals in the first direction, and the first heat dissipation fins 22 extend in the third direction to increase the heat dissipation area of the heat dissipation structure 2, thereby improving the heat dissipation efficiency of the connecting piece 1.

[0036] In this embodiment, the heat dissipation structure 2 further includes second heat dissipation fins 23. On at least one side of the first heat dissipation fins 22 in the first direction, a plurality of second heat dissipation fins 23 are provided at intervals in the second direction, and the second heat dissipation fins 23 extend in the first direction.

[0037] That is to say, first heat dissipation fins 22 are added outside the heat dissipation plate 211, and then second heat dissipation fins 23 are added outside the first heat dissipation fins 22, so as to further increase the heat dissipation area and ensure the heat dissipation efficiency of the connecting piece 1.

[0038] In this embodiment, the heat dissipation plate 211, the first heat dissipation fins 22 and the second heat dissipation fins 23 are integrally formed to ensure the stability of the heat dissipation structure 2, and the heat dissipation structure 2 can be integrally cast, which is convenient for production and manufacture.

[0039] In another embodiment, the heat dissipation member 21 is a heat dissipation column 212. A plurality of the heat dissipation columns 212 are provided, and the plurality of heat dissipation columns 212 are evenly distributed on the heat dissipation area 12.

[0040] That is to say, in this embodiment, the heat dissipation plate 211 is replaced by the heat dissipation column 212. By evenly distributing a plurality of the heat dissipation columns 212 in the area of the heat dissipation area 12, the heat dissipation area can also be increased, so as to improve the heat dissipation efficiency of the connecting piece 1 and reduce the influence on the battery cell 5.

[0041] Specifically, the heat dissipation column 212 is in the shape of a cuboid, a triangular prism or a cylinder, and the size and shape of the heat dissipation column 212 can be flexibly set according to requirements or production processes.

[0042] In this embodiment, the connecting piece 1 and the heat dissipation structure 2 are made of copper sheets or aluminum sheets.

[0043] By making the connecting piece 1 and the heat dissipation structure 2 of materials with better heat dissipation effects such as copper or aluminum materials, the heat dissipation efficiency of the connecting piece 1 can be improved, so as to reduce the heat transfer into the battery cell 5 and reduce the influence on the battery cell 5.

[0044] In another embodiment, the part of the connecting piece 1 located in the fixed area 11 is an aluminum sheet, and the part of the connecting piece 1 located in the heat dissipation area 12 is a copper sheet.

[0045] By making the part of the connecting piece 1 in the area of the fixed area 11 be an aluminum sheet, it is convenient to weld with the pole column, while the part of the connecting piece 1 in the area of the heat dissipation area 12 is a copper sheet. Since the thermal conductivity of copper is better than that of aluminum, the heat dissipation efficiency of the connecting piece 1 is higher.

[0046] In another embodiment, the battery pack includes a box body 3 and a cover body 4. An opening is formed on one side of the box body 3, and the cover body 4 covers the opening of the box body 3. A plurality of the battery cells 5 are arranged in the box body 3, and the pole columns of two adjacent battery cells 5 are connected through the connecting piece.

[0047] The pole columns of the battery cells 5 in the battery pack are connected through the connecting piece. The connecting piece has a high heat dissipation efficiency, thereby reducing the heat transfer of the connecting piece into the battery cells 5, avoiding affecting the battery cells 5, and ensuring the service life of the battery pack.

[0048] In this embodiment, the distance between the two sides of the connecting piece 1 of the connecting piece in the first direction is a, the distance between the two sides of the heat dissipation structure 2 in the first direction is b, and the distance between the connecting piece 1 and the cover body 4 in the first direction is c. Among them, a + b < c, so that the size of the connecting piece 1 will not affect the cover body 4 covering the opening of the box body 3.

[0049] Specifically, a is 1 - 2 mm, preferably 1.5 mm; b is 1 mm.

[0050] In summary, the embodiment of the present invention provides a battery pack. The pole columns of the battery cells of the battery pack are connected through a connecting piece, and heat dissipation structures are evenly distributed on the heat dissipation area of the connecting piece of the connecting piece, thereby improving the heat dissipation efficiency of the connecting piece to reduce the heat transfer of the connecting piece into the battery cells and ensuring the service life of the battery cells.

[0051] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A battery pack having a first direction, a second direction and a third direction intersecting each other, comprising a connector and a plurality of battery cells (5), wherein the connector is used to connect poles of two adjacent battery cells (5), characterized in that: The connecting member comprises a connecting plate (1) and a heat dissipation structure (2); an area on the connecting plate (1) connected to the pole is a fixed area (11); areas on the connecting plate (1) other than the fixed area (11) are heat dissipation areas (12); the heat dissipation structures (2) are evenly distributed on the heat dissipation areas (12); the heat dissipation structure (2) comprises a heat dissipation member (21) and a first heat dissipation fin (22); the heat dissipation member (21) is arranged on the heat dissipation area (12); a plurality of first heat dissipation fins (22) are arranged at intervals along the first direction on at least one side of the heat dissipation member (21) in the second direction; and the first heat dissipation fins (22) extend along a third direction.

2. The battery pack according to claim 1, characterized in that: The heat sink (21) is a heat sink (211); a plurality of the heat sinks (211) are arranged on the connection sheet (1) at intervals along the second direction; and the heat sinks (211) extend along the third direction.

3. The battery pack according to claim 2, characterized in that: The heat dissipation structure (2) further comprises second heat dissipation fins (23), a plurality of second heat dissipation fins (23) are arranged at intervals along a second direction on at least one side of the first heat dissipation fin (22) in the first direction, and the second heat dissipation fins (23) extend along the first direction.

4. The battery pack according to claim 3, characterized in that: The heat dissipation plate (211), the first heat dissipation fins (22) and the second heat dissipation fins (23) are integrally formed.

5. The battery pack according to claim 1, characterized in that: The heat sink (21) is a heat sink column (212), a plurality of the heat sink columns (212) are provided, and the plurality of the heat sink columns (212) are evenly distributed on the heat sink area (12).

6. The battery pack according to claim 5, characterized in that: The heat dissipation column (212) is in the shape of a cuboid, a triangular prism or a cylinder.

7. The battery pack according to claim 1, characterized in that: The connecting sheet (1) and the heat dissipation structure (2) are copper sheets or aluminum sheets.

8. The battery pack according to claim 1, characterized in that: The portion of the connecting sheet (1) located in the fixing area (11) is an aluminum sheet, and the portion of the connecting sheet (1) located in the heat dissipation area (12) is a copper sheet.

9. The battery pack according to any one of claims 1 to 8, characterized in that: It also comprises a box body (3) and a cover body (4); one side of the box body (3) is provided with an opening; the cover body (4) is arranged to cover the opening of the box body (3); a plurality of battery cells (5) are arranged in the box body (3); and the poles of two adjacent battery cells (5) are connected via the connecting piece.

10. The battery pack according to claim 9, characterized in that: The distance between the two sides of the connecting piece (1) of the connecting member in the first direction is a, the distance between the two sides of the heat dissipation structure (2) in the first direction is b, and the distance between the connecting piece (1) and the cover body (4) in the first direction is c, wherein a+b<c.

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