Single battery, battery pack and electric equipment

Abstract

The utility model discloses a single battery, battery pack and electric equipment, including electrode subassembly, shell and electrode terminal, said electrode subassembly includes a plurality of electrode slices that are stacked along the first direction, at least two positive pole piece of the plurality of electrode slices are discontinuously set, and the first direction is the thickness direction of the electrode slices; the electrode assembly is arranged in the shell, the shell comprises a first side wall and a second side wall which correspond to the side edges of the electrode plate, the first side wall is adjacent to the second side wall, and a heat-conducting medium is arranged between the electrode assembly and the first side wall and / or between the electrode assembly and the second side wall; and the electrode terminal is electrically connected with the electrode slice, and the electrode terminal is arranged on the second side wall. According to the single battery, the thermal resistance between the electrode assembly and the shell is small, and the overall heat dissipation capability and the cooling effect of the single battery are good.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and specifically, to a single cell, a battery pack and an electrical device. Background Art

[0002] In recent years, with the popularization of new energy vehicles, as the power source of new energy vehicles, power batteries have also developed rapidly. In order to ensure the safety and stability of power battery use, power batteries need to be cooled and dissipated heat by means of a cold plate, etc. However, in the actual use process, there are still problems with poor cooling effect of power batteries. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to a certain extent.

[0004] To this end, an embodiment of the utility model provides a single cell, which has a small thermal resistance between the electrode assembly and the housing, and has good overall heat dissipation ability and cooling effect.

[0005] An embodiment of the utility model further provides a battery pack including the above single cell.

[0006] An embodiment of the utility model further provides an electrical device including the above battery pack.

[0007] The single cell of the embodiment of the utility model includes:

[0008] An electrode assembly, the electrode assembly includes a plurality of electrode sheets stacked along a first direction, at least two of the plurality of electrode sheets are not continuously arranged, and the first direction is the thickness direction of the electrode sheet;

[0009] A housing, the electrode assembly is arranged in the housing, the housing includes a first side wall and a second side wall corresponding to the side edges of the electrode sheets, the first side wall and the second side wall are adjacent, and a heat conduction medium is provided between the electrode assembly and the first side wall and / or between the electrode assembly and the second side wall;

[0010] An electrode terminal, the electrode terminal is electrically connected to the electrode sheet, and the electrode terminal is arranged on the second side wall.

[0011] In some embodiments, the thermal conductivity of the electrode assembly in the first direction is k1, the thermal conductivity of the electrode assembly in a second direction perpendicular to the first direction is k2, and k2>k1.

[0012] In some embodiments, the thermal conductivity of the electrode assembly in a third direction is k3, k2≈k3, and the third direction is perpendicular to the first direction and the second direction.

[0013] In some embodiments, the thermal conductivity of the thermal conductive medium is k4, the distance between the electrode assembly and the first side wall of the housing is L1, the area of the first side wall is A1, and L1 / (k4*A1) ≤ 9.9 K / W.

[0014] In some embodiments, the housing includes a third side wall disposed opposite to the electrode sheet in the first direction, the thermal resistance R1 between the electrode assembly and the first side wall is not greater than the thermal resistance R2 between the electrode assembly and the third side wall, and the thermal resistance R1 is not greater than the thermal resistance R3 between the electrode assembly and the second side wall.

[0015] In some embodiments, there are two first side walls and two third side walls. The two first side walls are disposed opposite to each other in a second direction perpendicular to the first direction, the two third side walls are disposed opposite to each other in the first direction, and the thermal conductive medium is provided between each first side wall and the electrode assembly.

[0016] In some embodiments, the thermal conductivity of the thermal conductive medium is greater than the thermal conductivity between the electrode assembly and the side wall of the housing other than the first side wall.

[0017] In some embodiments, the length dimension of the thermal conductive medium in the first direction is not less than the length dimension of the electrode assembly in the first direction;

[0018] and / or, the length dimension of the thermal conductive medium in the second direction is not less than the length dimension of the electrode sheet in the second direction;

[0019] The battery pack according to an embodiment of the present invention includes a housing, a temperature regulating plate, and the single battery as described in any one of the above embodiments. There are multiple single batteries and multiple temperature regulating plates. The multiple single batteries are all assembled in the housing, the multiple temperature regulating plates are arranged at intervals along a third direction, and multiple single batteries are provided between adjacent two temperature regulating plates.

[0020] The electrical equipment according to an embodiment of the present invention includes the battery pack as described in any one of the above embodiments.

[0021] Beneficial effects: For the single battery, battery pack, and electrical equipment according to the embodiments of the present invention, the thermal resistance between the electrode assembly and the housing of the single battery is small, and the overall heat dissipation capacity and cooling effect of the single battery are good. Description of the Drawings

[0022] Figure 1 is a three-dimensional perspective schematic diagram of the single battery according to an embodiment of the present invention.

[0023] Figure 2It is a schematic cross-sectional view of a single cell according to an embodiment of the present invention and its cross-section at A-A.

[0024] Figure 3 is Figure 1 a perspective view of the single cell in the first direction in

[0025] Figure 4 is Figure 1 a perspective view of the single cell in the third direction in

[0026] Figure 5 It is an exploded view of a battery pack according to an embodiment of the present invention.

[0027] Figure 6 It is an exploded view of a single cell and a temperature regulating plate according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1 - single cell; 11 - electrode assembly; 111 - electrode sheet; 1111 - first side; 1112 - second side; 112 - separator; 12 - housing; 121 - first side wall; 122 - second side wall; 123 - third side wall; 13 - electrode terminal; 14 - heat-conducting medium;

[0030] 2 - outer shell; 21 - top cover; 22 - bottom shell;

[0031] 3 - temperature regulating plate;

[0032] 4 - pipeline. Detailed implementation manners

[0033] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0034] The single cell 1 according to an embodiment of the present invention includes an electrode assembly 11, a housing 12, and an electrode terminal 13. As Figure 1 shown, the housing 12 can be in the shape of a square shell, and the electrode assembly 11 can be processed by stacking, and the electrode assembly 11 can be assembled in the housing 12.

[0035] The electrode assembly 11 includes a plurality of electrode sheets 111 stacked along the first direction. At least two of the plurality of electrode sheets 111 are non-continuously arranged, and the first direction is the thickness direction of the electrode sheet 111.

[0036] For example, as Figure 2As shown, the multiple electrode sheets 111 of the electrode assembly 11 may include multiple positive electrode sheets and multiple negative electrode sheets, and the multiple positive electrode sheets and the multiple negative electrode sheets may be arranged alternately one by one in the first direction.

[0037] It should be noted that since the multiple electrode sheets 111 of the electrode assembly 11 are processed in a stacked manner, compared with the winding forming process, any two positive electrode sheets of the electrode assembly 11 in this embodiment are discontinuously designed, that is, there is no direct connection between adjacent two positive electrode sheets.

[0038] The electrode assembly 11 is disposed in the housing 12. The housing 12 includes a first side wall 121 and a second side wall 122 corresponding to the side edges of the electrode sheet 111. The first side wall 121 and the second side wall 122 are adjacent, and a heat-conducting medium 14 is provided between the electrode assembly 11 and the first side wall 121 and / or between the electrode assembly 11 and the second side wall 122.

[0039] For example, as Figure 2 shown, the electrode sheet 111 may generally be a rectangular sheet, each electrode sheet 111 may be arranged perpendicular to the first direction, and each electrode sheet 111 may include two first side edges 1111 arranged opposite to each other in the second direction and two second side edges 1112 arranged opposite to each other in the third direction.

[0040] The housing 12 is in the shape of a square shell. The housing 12 has a total of six side walls, and there are two of the first side wall 121 and the second side wall 122 respectively. The two first side walls 121 may be arranged opposite to each other in the third direction and are respectively disposed outside the two second side edges 1112. The third direction may be the front-back direction. One of the first side walls 121 may be disposed on the front side of the electrode assembly 11, and the other first side wall 121 may be disposed on the rear side of the electrode assembly 11.

[0041] The two second side walls 122 may be arranged opposite to each other in the second direction and are respectively disposed outside the two first side edges 1111. The second direction may be the up-down direction. One of the second side walls 122 may be disposed on the top side of the electrode assembly 11, and the other second side wall 122 may be disposed on the bottom side of the electrode assembly 11.

[0042] The above-mentioned heat-conducting medium 14 may be filled between each of the two first side walls 121 and the electrode assembly 11. The heat-conducting medium 14 may be a heat-conducting structural adhesive. A gap may be reserved between each first side wall 121 and the electrode assembly 11, and the heat-conducting medium 14 may be filled in the gap reserved between the first side wall 121 and the electrode assembly 11. In some other embodiments, the heat-conducting medium 14 may also be filled between each second side wall 122 and the electrode assembly 11.

[0043] The electrode terminal 13 is electrically connected to the electrode sheet 111, and the electrode terminal 13 is disposed on the second side wall 122. For example, asFigure 2 As shown, a pole ear can be led out from the electrode plate 111, and the pole ear can be regarded as the electrode terminal 13, and the electrode terminal 13 can be arranged on the top side of the single cell 1. Thus, the electrode terminal 13 is generally located in the extended plane of the electrode plate 111, which facilitates the leading-out of the electrode terminal 13 and avoids the situation of bending the electrode terminal 13.

[0044] In the single cell 1 of the embodiment of the present utility model, the setting of the heat-conducting medium 14 can reduce the thermal resistance between the electrode assembly 11 and the first side wall 121, thereby further improving the heat-conducting performance of the single cell 1, enabling the first side wall 121 to become the optimal heat dissipation surface of the single cell 1, thus providing convenience for the cooling design on the side of the single cell 1 and also improving the overall cooling efficiency.

[0045] Secondly, the heat-conducting medium 14 also has a certain elasticity, which can play a role in buffering the extrusion and vibration between the housing 12 and the electrode assembly 11.

[0046] In addition, in the prior art, the heat generated by the middle electrode plate 111 needs to be transferred outward through multiple electrode plates 111, which makes it more difficult to export the heat of the middle electrode plate 111 compared with the outer electrode plates 111. In the present utility model, the first side wall 121 and the second side wall 122 are opposite to the side edges of the electrode plate 111, and the side edges are the above-mentioned first side edge 1111 or second side edge 1112. When arranging the temperature-regulating plate 3, it can be attached to the first side wall 121 or the second side wall 122, so that the heat conduction paths of each electrode plate 111 are equivalent, and the heat dissipation effects of each electrode plate 111 are basically the same, and the problem of heat accumulation in the middle of each single cell 1 is also improved, further ensuring the overall heat dissipation performance of the battery.

[0047] In some embodiments, as Figure 4 shown, the thermal conductivity coefficient of the electrode assembly 11 in the first direction is k1, as Figure 5 shown, the thermal conductivity coefficient of the electrode assembly 11 in the second direction perpendicular to the first direction is k2, and k2 > k1.

[0048] Since the heat-conducting medium 14 is filled between the first side wall 121 and the electrode assembly 11 and between the second side wall 122 and the electrode assembly 11, and the heat-conducting medium 14 is all arranged at the circumferential side position of the electrode plate 111, thus, the direction in which the heat of the electrode assembly 11 is easily conducted is perpendicular to the first direction, and the setting of the heat-conducting medium 14 also fits the easily conducted direction, thereby further improving the heat exchange efficiency.

[0049] In some embodiments, as Figure 3As shown, the thermal conductivity of the electrode assembly 11 in the third direction is k3, k2≈k3, and the third direction is perpendicular to the first direction and the second direction. Thus, it makes the heat-conducting medium 14 easier to conduct heat along the second direction and the third direction, so that the arrangement of the heat-conducting medium 14 is adapted to the heat-conducting direction of the electrode assembly 11.

[0050] In some embodiments, the thermal conductivity of the heat-conducting medium 14 is k4. After the material of the heat-conducting medium 14 is determined, the thermal conductivity k4 of the heat-conducting medium 14 is also the thermal conductivity of the corresponding material.

[0051] As Figure 3 shown, the distance between the electrode assembly 11 and the first side wall 121 is L1, and the distance L1 is also the width of the reserved gap between the electrode assembly 11 and the first side wall 121. The area of the first side wall 121 is A1, and the area A1 is the projected area of the first side wall 121 in the third direction, and L1 / (k4*A1)≤9.9K / W.

[0052] By limiting the thermal conductivity k4, the area A1 of the first side wall 121, and the distance L1 within the range defined by the above inequality, an optimized design of the thermal conductivity k4, the area A1 of the first side wall 121, and the distance L1 can be achieved. Furthermore, it can avoid the situation that the distance between the first side wall 121 and the electrode assembly 11 is too far or the thermal conductivity is insufficient, resulting in poor heat dissipation. That is, if L1 / (k4*A1)>9.9K / W, it will affect the side heat dissipation effect of the single cell 1, and then cannot meet the use requirement that the maximum temperature of the battery is <55°C under the normal temperature fast charging condition.

[0053] In some embodiments, as Figure 3 and Figure 4 shown, the housing 12 includes a third side wall 123 arranged opposite to the electrode plate 111 in the first direction, wherein the third side wall 123 is substantially perpendicular to both the first side wall 121 and the second side wall 122. The thermal resistance R1 between the electrode assembly 11 and the first side wall 121 is not greater than the thermal resistance R2 between the electrode assembly 11 and the third side wall 123, and the thermal resistance R1 is not greater than the thermal resistance R3 between the electrode assembly 11 and the second side wall 122. Thus, it can make both the first side wall 121 and the second side wall 122 form better heat dissipation surfaces, facilitating the fitting arrangement of the single cell 1 and the temperature regulating plate 3.

[0054] In some embodiments, there are two first side walls 121 and two third side walls 123. As Figure 3 shown, the two first side walls 121 are arranged opposite to each other in the second direction perpendicular to the first direction. As Figure 4As shown, two third side walls 123 are arranged opposite to each other in the first direction, and a heat-conducting medium 14 is provided between each first side wall 121 and the electrode assembly 11. This increases the heat dissipation area and is also beneficial to improving the cooling efficiency.

[0055] In some embodiments, the thermal conductivity of the heat-conducting medium 14 is greater than the thermal conductivity between the electrode assembly 11 and the side walls of the housing 12 other than the first side walls 121. For example, the housing 12 can be in the shape of a square shell, and the housing 12 can have a total of six side walls, among which there are two first side walls 121, and the two first side walls 121 are arranged opposite to each other in the third direction. There may be only a gap or a space between the second side walls 122 and the third side walls 123 arranged opposite to each other in the first direction or the second direction and the electrode assembly 11.

[0056] The thermal conductivity of the heat-conducting medium 14 is much greater than the thermal conductivity of the vacant gap or space. Thus, the first side wall 121 can form an optimal heat dissipation surface of the single cell 1, which can provide convenience for the cooling design of the side of the single cell 1 and also improve the overall cooling efficiency.

[0057] In some embodiments, as Figure 2 shown, the length dimension of the heat-conducting medium 14 in the first direction is not less than the length dimension of the electrode assembly 11 in the first direction. Thus, the heat-conducting medium 14 can completely cover the electrode assembly 11 in the first direction, thereby fully ensuring the heat conduction effect in the third direction.

[0058] In some embodiments, as Figure 2 shown, the length dimension of the heat-conducting medium 14 in the second direction is not less than the length dimension of the electrode plate 111 in the second direction. Thus, the heat-conducting medium 14 can completely cover the electrode assembly 11 in the second direction, thereby further ensuring the heat conduction effect in the third direction.

[0059] The battery pack according to the embodiments of the present invention will be described below.

[0060] The battery pack according to the embodiments of the present invention includes a housing 2 and single cells 1. The single cells 1 can be the single cells 1 described in any of the above embodiments. There are multiple single cells 1, and the multiple single cells 1 are all assembled in the housing 2. As Figure 5 shown, the multiple single cells 1 can be arranged in a matrix as a whole, and the multiple single cells 1 can be arranged in columns along the first direction and in rows along the third direction. Each column can include multiple single cells 1 arranged at intervals along the first direction, and each row can include multiple single cells 1 arranged at intervals along the third direction.

[0061] As Figure 5 and Figure 6As shown, the battery pack further includes a plurality of temperature regulating plates 3. Each temperature regulating plate 3 can be in the shape of a long plate, each temperature regulating plate 3 extends along the first direction, and the plurality of temperature regulating plates 3 are arranged at intervals in the third direction.

[0062] As Figure 6 shown, a pipeline 4 can be provided on the same side of the plurality of temperature regulating plates 3 along the first direction. There are two pipelines 4. The two pipelines 4 are respectively a liquid inlet pipe and a liquid discharge pipe. The liquid inlet pipe and the liquid discharge pipe can be communicated with each temperature regulating plate 3. Through the liquid inlet pipe, a temperature regulating medium can be introduced into the plurality of temperature regulating plates 3, and then the temperature regulating medium in the plurality of temperature regulating plates 3 can be discharged through the liquid discharge pipe, so that the circulating transportation of the temperature regulating medium in the plurality of temperature regulating plates 3 can be realized, and further the cooling of each single battery 1 can be realized.

[0063] In some embodiments, as Figure 5 shown, the housing 2 can include a bottom shell 22 and a top cover 21. The bottom shell 22 can be in the shape of a square box, the top of the bottom shell 22 is open, and the top cover 21 can be fixed to the top side of the bottom shell 22 through fasteners to block the open top. The plurality of single batteries 1 can be arranged in a matrix and can be assembled in the bottom shell 22.

[0064] The electrical equipment of the embodiments of the present invention will be described below.

[0065] The electrical equipment of the embodiments of the present invention includes a battery pack, and the battery pack can be the battery pack described in any of the above embodiments. The electrical equipment can be a vehicle such as a sedan or an SUV, and of course it can also be other electrical equipment that needs to install a battery pack.

[0066] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A single cell battery, characterized in that: include: An electrode assembly, the electrode assembly comprising a plurality of electrode sheets stacked and arranged along a first direction, at least two positive electrode sheets among the plurality of electrode sheets being arranged discontinuously, and the first direction being a thickness direction of the electrode sheets; A shell, wherein the electrode assembly is disposed in the shell, the shell comprising a first side wall and a second side wall corresponding to the side edge of the electrode sheet, the first side wall and the second side wall are adjacent, and a heat conducting medium is disposed between the electrode assembly and the first side wall and / or between the electrode assembly and the second side wall; An electrode terminal is electrically connected to the electrode sheet and is disposed on the second side wall.

2. The single cell according to claim 1, characterized in that: The thermal conductivity of the electrode assembly in a first direction is k1, the thermal conductivity of the electrode assembly in a second direction perpendicular to the first direction is k2, and k2>k1.

3. The single cell according to claim 2, characterized in that: The thermal conductivity of the electrode assembly in a third direction is k3, k2≈k3, and the third direction is perpendicular to the first direction and the second direction.

4. The single cell according to claim 1, characterized in that: The thermal conductivity of the heat-conducting medium is k4, the distance between the electrode assembly and the first side wall of the shell is L1, the area of ​​the first side wall is A1, and L1 / (k4*A1)≤9.9K / W.

5. The single cell according to claim 1, characterized in that: The shell includes a third side wall arranged opposite to the electrode sheet in the first direction, the thermal resistance R1 between the electrode assembly and the first side wall is not greater than the thermal resistance R2 between the electrode assembly and the third side wall, and the thermal resistance R1 is not greater than the thermal resistance R3 between the electrode assembly and the second side wall.

6. The single cell according to claim 5, characterized in that: There are two of the first side walls and two of the third side walls, the two first side walls are arranged opposite to each other in a second direction perpendicular to the first direction, the two third side walls are arranged opposite to each other in the first direction, and the heat conductive medium is arranged between each of the first side walls and the electrode assembly.

7. The single cell according to claim 1, characterized in that: The heat conductivity of the heat-conducting medium is greater than the thermal conductivity between the electrode assembly and a side wall of the housing other than the first side wall.

8. The single cell according to any one of claims 1 to 7, characterized in that: The length dimension of the heat-conducting medium in the first direction is not less than the length dimension of the electrode assembly in the first direction; And / or, the length dimension of the heat-conducting medium in the second direction is not less than the length dimension of the electrode sheet in the second direction.

9. A battery pack, characterized in that: It comprises a shell, a temperature regulating plate and a single cell as described in any one of claims 1 to 8, wherein there are a plurality of single cells and a plurality of temperature regulating plates, and the plurality of single cells are assembled in the shell, the plurality of temperature regulating plates are arranged at intervals along a third direction, and a plurality of single cells are arranged between two adjacent temperature regulating plates.

10. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 9 above.

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