Battery pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack. Comprising a battery cell unit and a first cooling plate, the battery cell unit is provided with a first outer wall and a pole, the pole and the first outer wall are located on the same side of the battery cell unit, and the pole protrudes out of the first outer wall; the first cooling plate is located on the side, provided with the pole, of the battery cell unit, a first cooling part and a second cooling part which have a height difference are arranged on the side, facing the pole, of the first cooling plate, the first cooling part is suitable for being attached to the first outer wall, and the second cooling part is suitable for being attached to the pole. A first cooling part and a second cooling part with a height difference are arranged on the first cooling plate, so that the first cooling part and the second cooling part can respectively act on the first outer wall and the pole of the battery cell unit, the pole and the first outer wall of the battery cell unit are synchronously cooled, the cooling effect of the pole side of the battery cell unit is improved, and the battery cell unit cooling efficiency is improved. And the heat dissipation effect and the safety performance of the battery pack are further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and in particular relates to a battery pack. Background Art

[0002] The cells of a battery pack will emit heat during use. In order to ensure stable operation of the battery pack, a cooling system is generally required in the battery pack to improve the heat dissipation effect of the battery pack. Currently, traditional cooling systems have cooling blind spots, especially the poles and areas near the poles of the cells in the battery pack, resulting in poor heat dissipation on the pole side of the cells, affecting the safety performance of the battery pack. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a battery pack for solving the problem of poor heat dissipation on the pole side of the battery cell in the prior art, so as to improve the heat dissipation effect and safety performance of the battery pack.

[0004] In order to achieve the above-mentioned object and other related objects, the utility model provides a battery pack, comprising:

[0005] A battery cell unit, wherein the battery cell unit has a first outer wall and a pole, wherein the pole and the first outer wall are located on the same side of the battery cell unit, and the pole protrudes from the first outer wall; and

[0006] A first cooling plate, wherein the first cooling plate is located on a side of the battery cell unit having the pole, and a first cooling portion and a second cooling portion having a height difference are provided on a side of the first cooling plate facing the pole, wherein the first cooling portion is suitable for fitting with the first outer wall, and the second cooling portion is suitable for fitting with the pole.

[0007] Optionally, the first cooling plate includes a main board body, and a part of the main board body on one side facing the first outer wall is raised to form the first cooling portion protruding outward from the rest of the main board body.

[0008] Optionally, the first cooling plate includes a main board body, and a part of the main board body on a side facing the pole is recessed to form the second cooling portion recessed in the rest of the main board body.

[0009] Optionally, the battery cell unit further has an explosion-proof valve, the explosion-proof valve and the pole are located on the same side of the battery cell unit, and the first cooling plate is provided with an opening corresponding to the explosion-proof valve, and the opening is staggered with the cooling channel in the first cooling plate.

[0010] Optionally, it further includes: a second cooling plate, the battery cell unit has a first side and a second side distributed along a first direction and opposite to each other, the outer wall of the first side is formed as the first outer wall, and the second cooling plate is arranged on the second side.

[0011] Optionally, the first outer wall faces the top of the battery pack or faces the bottom of the battery pack.

[0012] Optionally, the battery cell unit further has an explosion-proof valve, which is located on the second side, and an opening corresponding to the explosion-proof valve is formed on the second cooling plate, and the opening is staggered with a cooling channel in the second cooling plate.

[0013] Optionally, the battery cell unit includes a plurality of stacked battery cells, each of the battery cells has the explosion-proof valve, and the number of the openings is multiple and corresponds one-to-one to the multiple explosion-proof valves.

[0014] Optionally, it further includes: a third cooling plate, the battery cell unit has a third side and a fourth side distributed along the second direction and opposite to each other, and the third side and the fourth side are both arranged with the third cooling plate.

[0015] Optionally, there are multiple third cooling plates, which are spaced apart along the second direction; there are multiple battery cell units, which are spaced apart along the second direction; and two adjacent battery cell units are separated by the third cooling plates.

[0016] Optionally, the pole and the first cooling plate are directly bonded and fixed by using a heat-conducting structural adhesive.

[0017] As described above, the battery pack of the utility model has at least the following beneficial effects: a first cooling part and a second cooling part with a height difference are provided on the first cooling plate, so that the first cooling part and the second cooling part can act on the first outer wall and the pole of the battery cell unit respectively, thereby synchronously cooling the pole and the first outer wall of the battery cell unit, improving the cooling effect of the pole side of the battery cell unit, and further improving the heat dissipation effect and safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a partial structural schematic diagram of the first embodiment of the battery pack of the utility model;

[0019] Figure 2 for Figure 1 Sectional view at AA in the middle;

[0020] Figure 3 for Figure 2 A magnified schematic diagram of the middle part B1;

[0021] Figure 4for Figure 2 A magnified schematic diagram of the middle part B2;

[0022] Figure 5 for Figure 4 A magnified schematic diagram of the middle part B3;

[0023] Figure 6 It is a partial structural schematic diagram of the second embodiment of the battery pack of the utility model;

[0024] Figure 7 for Figure 6 Sectional view at CC;

[0025] Figure 8 for Figure 7 A magnified schematic diagram of the local D1 in the middle;

[0026] Fig. 9 for Figure 7 A magnified schematic diagram of the local D2 in the middle;

[0027] Fig.10 for Fig. 9 A magnified schematic diagram of the local area D3 in the figure.

[0028] Part Number Description

[0029] Battery cell unit 1, battery cell 11, first outer wall 12, pole 13, explosion-proof valve 14, first cooling plate 2, first cooling part 21, second cooling part 22, third cooling plate 3, opening 4, cooling channel 5, bar plate 6, end beam 7. DETAILED DESCRIPTION

[0030] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0031] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0032] See 1 to Fig.10In some optional embodiments, the present application provides a battery pack, which includes a battery cell unit 1 and a first cooling plate 2; in addition to the above components, the battery pack may also include a second cooling plate (not shown) and / or a third cooling plate 3 and / or an end beam 7. The battery cell unit 1 has a first outer wall 12 and a pole 13, the pole 13 and the first outer wall 12 are located on the same side of the battery cell unit 1, and the pole 13 protrudes from the first outer wall 12; the first cooling plate 2 is located on the side of the battery cell unit 1 having the pole 13, and the first cooling plate 2 is provided with a first cooling portion 21 and a second cooling portion 22 with a height difference on the side facing the pole 13, the first cooling portion 21 is suitable for fitting with the first outer wall 12 to cool the first outer wall 12, and the second cooling portion 22 is suitable for fitting with the pole 13 to cool the pole 13. Among them, the first cooling plate 2, the second cooling plate and the third cooling plate 3 are all provided with cooling channels 5 for the circulation of cooling medium.

[0033] Optionally, the second cooling part 22 is directly bonded to the pole 13 or indirectly bonded. Furthermore, the pole 13 and the first cooling plate 2 can be directly bonded and fixed by a thermally conductive structural adhesive, or a bar piece 6 is provided on the pole 13, and the bar piece 6 is directly bonded to the second cooling part 22 or directly bonded by a thermally conductive structural adhesive. Specifically, the thermally conductive structural adhesive is located between the second cooling part 22 and the pole 13 to bond and fix the pole 13 to the second cooling part 22, thereby achieving a connection and fixation between the pole 13 and the first cooling plate 2, and the connection is simple, convenient, and firm, with good thermal conductivity, which is conducive to heat dissipation and cooling.

[0034] Optionally, the battery cell unit 1 has a first side and a second side distributed along a first direction and opposite to each other, and the outer wall of the first side is formed as a first outer wall 12; wherein the battery cell unit 1 has a main body, and the outer wall of the first side is formed by part of the main body itself, which is conducive to improving the problem of local overheating of the battery cell unit 1. The second cooling plate is arranged on the second side of the battery cell unit 1, and the first cooling plate 2 and the second cooling plate cooperate to realize double-sided cooling of the battery cell unit 1, and the cooling effect is good.

[0035] Optionally, the battery cell unit 1 has a third side and a fourth side distributed along the second direction and opposite to each other, and the third side and the fourth side are both arranged with a third cooling plate 3, that is, the number of the third cooling plates 3 is multiple, and the multiple third cooling plates 3 are distributed at intervals along the second direction. The first cooling plate 2, the second cooling plate and the third cooling plate 3 cooperate to achieve four-side cooling of the battery cell unit 1, further improving the cooling effect, thereby facilitating the improvement of heat dissipation performance.

[0036] Optionally, there are multiple battery cell units 1, each battery cell unit 1 has a pole 13 and an explosion-proof valve 14, and multiple battery cell units 1 can be stacked along the second direction, and two adjacent battery cell units 1 can be separated by a third cooling plate 3. Each battery cell unit 1 may include multiple stacked battery cells 11, and the battery cells 11 are provided with poles 13 and explosion-proof valves 14. The poles 13 and explosion-proof valves 14 can be located on the same side of the battery cells 11, or on different sides of the battery cells 11. It can be understood that in the present application, the height direction of the battery cell unit 1 and the height direction of the battery cell 11 are the same as the first direction, that is, the Z direction in the drawings; the side-by-side direction of the multiple battery cell units 1, the distribution direction of the multiple third cooling plates 3 are the same as the second direction, that is, the Y direction in the drawings; the stacking direction of the multiple battery cells 11 in each battery cell unit 1 is the same as the length direction of the third cooling plate 3, that is, the X direction in the drawings.

[0037] Optionally, the end beam 7 , the second cooling plate, the third cooling plate 3 and the battery cell unit 1 are all located on the same side of the first cooling plate 2 , the end beam 7 is fixedly connected to the first cooling plate 2 , and the third cooling plate 3 is fixedly connected to the end beam 7 .

[0038] In the battery pack of the above embodiment, the first cooling plate 2 is provided with a first cooling part 21 and a second cooling part 22 corresponding to the first outer wall 12 and the pole 13 of the battery cell unit 1 respectively. The first cooling part 21 and the second cooling part 22 cooperate to cool different parts of the battery cell unit 1. The first cooling plate 2 has high adaptability to the pole side of the battery cell unit 1, which is beneficial to improving the cooling effect, thereby improving the heat dissipation and safety of the battery pack.

[0039] See also Figures 3 to 5 , Figures 8 to 10 In some optional embodiments, the first cooling plate 2 includes a main board body, and a local protrusion on one side of the main board body facing the first outer wall 12 is formed to form a first cooling portion 21 protruding outward from the rest of the main board body. The structure is simple, the molding and manufacturing are convenient, and the cooling effect is good.

[0040] In some optional embodiments, the first cooling plate 2 includes a main board body, and a local depression on one side of the main board body facing the pole 13 is formed to form a second cooling portion 22 recessed in the rest of the main board body, which has a simple structure, is easy to form and manufacture, and has a good cooling effect.

[0041] See also Figures 5 to 8 In some optional embodiments, the explosion-proof valve 14 and the pole 13 are located on the same side of the battery cell unit 1, that is, the exhaust side and the pole side of the battery cell unit 1 are located on the same side, and an opening 4 corresponding to the explosion-proof valve 14 is opened on the first cooling plate 2, and the opening 4 is staggered with the cooling channel 5 in the first cooling plate 2.

[0042] In the battery pack of the above embodiment, the exhaust side and the pole side of the battery cell unit 1 are located on the same side, and the exhaust is fast and convenient, which is conducive to timely exhaust of smoke, reduces the risk of thermal runaway, and improves the safety performance of the battery pack.

[0043] See also Figures 1 to 5 In some optional embodiments, the explosion-proof valve 14 and the pole 13 are respectively located on the first side and the second side of the battery cell unit 1, that is, the explosion-proof valve 14 and the pole 13 are distributed on different sides, or the exhaust side and the pole side of the battery cell unit 1 are on different sides. The first cooling plate 2 is located on the side of the battery cell unit 1 provided with the pole 13, that is, the first cooling plate 2 is arranged on the first side of the battery cell unit 1, and the second cooling plate is located on the side of the battery cell unit 1 provided with the explosion-proof valve 14, that is, the second cooling plate is arranged on the second side of the battery cell unit 1, and an opening corresponding to the explosion-proof valve 14 is opened on the second cooling plate, and the opening is staggered with the cooling flow channel in the second cooling plate.

[0044] In the battery pack of the above embodiment, the exhaust side and the pole side of the battery cell unit 1 are located on different sides of the battery cell unit 1, so that the exhausted smoke is away from the pole 13, which is beneficial to avoid affecting other normal battery cells 11 and reduce the risk of thermal runaway, thereby helping to improve the safety performance of the battery pack.

[0045] See 1 to Fig.10 In some optional embodiments, the first outer wall 12 may be toward the top of the battery pack or toward the bottom of the battery pack.

[0046] Optionally, when the first outer wall 12 faces the top of the battery pack, that is, the side of the battery cell unit 1 having the pole 13 faces the top of the battery pack, that is, the battery cell unit 1 is upright. When the pole 13 and the explosion-proof valve 14 are on the same side, the pole 13 and the explosion-proof valve 14 both face the top of the battery pack, that is, the pole 13 and the explosion-proof valve 14 can face upward in the vertical direction or upward in the Z direction; when the pole 13 and the explosion-proof valve 14 are on different sides, the pole 13 faces the top of the battery pack, and the explosion-proof valve 14 faces the bottom of the battery pack, that is, the pole 13 can face upward in the vertical direction or upward in the Z direction, and the explosion-proof valve 14 can face downward in the vertical direction or downward in the Z direction.

[0047] Optionally, when the first outer wall 12 faces the bottom of the battery pack, that is, the side of the battery cell unit 1 having the pole 13 faces the bottom of the battery pack, that is, the battery cell unit 1 is inverted. When the pole 13 and the explosion-proof valve 14 are on the same side, the pole 13 and the explosion-proof valve 14 both face the bottom of the battery pack, that is, the pole 13 and the explosion-proof valve 14 can face downward in the vertical direction or downward in the Z direction; when the pole 13 and the explosion-proof valve 14 are on different sides, the pole 13 faces the bottom of the battery pack, and the explosion-proof valve 14 faces the top of the battery pack, that is, the pole 13 can face downward in the vertical direction or downward in the Z direction, and the explosion-proof valve 14 can face upward in the vertical direction or upward in the Z direction.

[0048] In the battery pack of the above embodiment, the placement of the battery cell unit 1 in the battery pack can be selected to be upright or inverted according to the installation requirements, and the installation is flexible and has a wide range of adaptability.

[0049] See also Figure 1 and Figure 6 In some optional embodiments, the battery cell unit 1 includes a plurality of stacked battery cells 11, each battery cell 11 has an explosion-proof valve 14, and the number of openings 4 is multiple, and corresponds one-to-one to the multiple explosion-proof valves 14, which is conducive to timely discharge of high-temperature flue gas and improves safety.

[0050] In the battery pack of the utility model, the first cooling plate 2 corresponding to the pole side of the battery cell unit 1 is adapted to the pole side of the battery cell unit 1, especially through the cooperation of the first cooling part 21 and the second cooling part 22, the pole 13 and the first outer wall 12 of the battery cell unit 1 can be fitted and cooled, thereby improving the cooling effect, thereby improving the heat dissipation and safety of the battery pack.

[0051] In the description of this specification, the description with reference to the terms "this embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: A battery cell unit, wherein the battery cell unit has a first outer wall and a pole, wherein the pole and the first outer wall are located on the same side of the battery cell unit, and the pole protrudes from the first outer wall; as well as A first cooling plate, wherein the first cooling plate is located on a side of the battery cell unit having the pole, and a first cooling portion and a second cooling portion having a height difference are provided on a side of the first cooling plate facing the pole, wherein the first cooling portion is suitable for fitting with the first outer wall, and the second cooling portion is suitable for fitting with the pole.

2. The battery pack according to claim 1, characterized in that: The first cooling plate includes a main board body, and a part of the main board body on one side facing the first outer wall is raised to form the first cooling portion protruding outward from the rest of the main board body.

3. The battery pack according to claim 1, characterized in that: The first cooling plate includes a main plate body, and a part of the main plate body on a side facing the pole is recessed to form the second cooling portion recessed in the rest of the main plate body.

4. The battery pack according to claim 1, characterized in that: The battery cell unit also has an explosion-proof valve, which is located on the same side of the battery cell unit as the pole, and an opening corresponding to the explosion-proof valve is formed on the first cooling plate, and the opening is staggered with the cooling channel in the first cooling plate.

5. The battery pack according to claim 1, characterized in that: Also includes: The second cooling plate, the battery cell unit has a first side and a second side distributed along a first direction and opposite to each other, the outer wall of the first side is formed as the first outer wall, and the second cooling plate is arranged on the second side.

6. The battery pack according to claim 4 or 5, characterized in that: The first outer wall faces the top of the battery pack or faces the bottom of the battery pack.

7. The battery pack according to claim 5, characterized in that: The battery cell unit further has an explosion-proof valve, which is located on the second side. The second cooling plate is provided with an opening corresponding to the explosion-proof valve, and the opening is staggered with the cooling channel in the second cooling plate.

8. The battery pack according to claim 4 or 7, characterized in that: The battery cell unit includes a plurality of stacked battery cells, each of the battery cells has the explosion-proof valve, and the number of the openings is plural and corresponds one-to-one to the plurality of explosion-proof valves.

9. The battery pack according to claim 1, characterized in that: Also includes: The third cooling plate, the battery cell unit has a third side and a fourth side distributed along the second direction and facing each other, and the third cooling plate is arranged on both the third side and the fourth side.

10. The battery pack according to claim 9, characterized in that: There are multiple third cooling plates, which are spaced apart along the second direction; there are multiple battery cell units, which are spaced apart along the second direction; and two adjacent battery cell units are spaced apart by the third cooling plates.

11. The battery pack according to claim 1, characterized in that: The pole and the first cooling plate are directly bonded and fixed by means of a heat-conducting structural adhesive.

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