Battery cell, battery pack, battery device, and electric device

Abstract

The utility model discloses a kind of battery monomer, battery pack, battery device and electric device, battery monomer includes shell and electrode assembly, shell includes multiple shell portions connected in turn, in the projection of reference surface, the extension direction of adjacent two shell portions is different, reference surface is perpendicular to first direction, first direction is perpendicular with the extension direction of shell portion, electrode assembly is located in shell and includes pole piece, pole piece continuously extends from one shell portion to adjacent next shell portion. According to the battery monomer of the utility model embodiment, the thickness of this battery monomer is thinner, the heat dissipation effect of electrode assembly in battery monomer is improved, it is favorable to reduce the temperature rise generated when battery monomer works, thereby it is favorable to improve the cycle life and performance of battery monomer.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell, battery pack, battery device and power-consuming device. Background Technology

[0002] In related technologies, a battery cell includes a casing and an electrode assembly disposed inside the casing. The electrode assembly includes electrode plates. When the battery cell is operating, the heat generated by the electrode assembly inside the casing is transferred to the outside of the casing for heat dissipation. However, in the battery cells of related technologies, the heat dissipation effect of the electrode assembly is poor, resulting in a large temperature rise during operation, which affects the cycle life and performance of the battery cell. Therefore, how to improve the heat dissipation effect of the electrode assembly inside the battery cell to improve the cycle life and performance of the battery cell has become an urgent technical problem to be solved. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a battery cell with a thinner thickness, which improves the heat dissipation of the electrode components within the battery cell, thereby reducing the temperature rise generated during battery cell operation and thus improving the cycle life and performance of the battery cell.

[0004] This invention proposes a battery pack comprising the aforementioned battery cells.

[0005] This utility model proposes a battery device including the above-mentioned battery pack.

[0006] This utility model also proposes an electrical device that includes the above-mentioned battery device.

[0007] A battery cell according to a first aspect of the present invention includes: a housing, the housing including a plurality of shell portions connected in sequence, wherein adjacent shell portions have different extension directions in the projection of a reference plane, the reference plane being perpendicular to a first direction, the first direction being perpendicular to the extension direction of the shell portions; and an electrode assembly disposed within the housing and including an electrode sheet, the electrode sheet extending continuously from one shell portion to the next adjacent shell portion.

[0008] According to the embodiments of the present invention, the battery cell is configured with a housing comprising a plurality of sequentially connected shell portions, wherein adjacent shell portions extend in different directions within the projection of a reference plane, and the electrode extends continuously from one shell portion to the next adjacent shell portion. This reduces the thickness of the electrode assembly while maintaining a fixed battery cell capacity, thereby reducing the thickness of the electrode assembly. The thinner battery cell results in a thinner electrode assembly, which reduces heat concentration within the electrode assembly and shortens the heat transfer path between the electrode portions and the housing, particularly shortening the heat transfer path between the middle portion of the electrode assembly in the thickness direction. This allows heat from the electrode assembly to be transferred more quickly to the outside of the housing for dissipation, effectively improving the heat dissipation of the battery cell and reducing the temperature rise during operation, thus improving the cycle life and performance of the battery cell.

[0009] According to some embodiments of the present invention, the thickness ratio of any two shell portions is 0.8 to 1.2, and the thickness direction of the shell portion is perpendicular to the first direction and perpendicular to the extension direction of the shell portion.

[0010] According to some embodiments of the present invention, a plurality of the shell portions are coplanarly arranged along at least one side of the first direction; and / or, the plurality of shell portions have the same height dimension in the first direction.

[0011] According to some embodiments of the present invention, the electrode includes a straight portion located within the corresponding shell portion and extending along the extension direction of the corresponding shell portion, wherein the thickness direction of the straight portion is perpendicular to both the first direction and the extension direction of the corresponding shell portion.

[0012] According to some embodiments of the present invention, the electrode assembly includes an electrode group, which is a wound electrode group. The electrode group is formed by winding a winding unit around a winding center surface. The winding unit includes the electrode sheet. The winding center surface extends continuously from one shell portion to the next adjacent shell portion. The winding center surface includes a plurality of center portions connected in sequence. The extension directions of two adjacent center portions are different. The number of center portions is the same as the number of shell portions and they correspond one-to-one. Each center portion is located in the corresponding shell portion.

[0013] According to some embodiments of this utility model, the electrode sheets with the same polarity are integrally formed parts.

[0014] According to some embodiments of the present invention, the electrode assembly includes an electrode group, which is a stacked electrode group. The electrode group includes multiple layers of electrode sheets stacked along the thickness direction of the shell portion. The thickness direction of the shell portion is perpendicular to the first direction and perpendicular to the extension direction of the shell portion. Each layer of electrode sheets extends continuously from one shell portion to the next adjacent shell portion. Each layer of electrode sheets includes multiple electrode sheet portions connected in sequence. The extension directions of two adjacent electrode sheet portions are different. The number of electrode sheet portions is the same as the number of shell portions and they correspond one-to-one. Each electrode sheet portion is located in the corresponding shell portion.

[0015] According to some embodiments of this utility model, each layer of the electrode sheet is an integrally formed part.

[0016] According to some embodiments of the present invention, the housing includes three shell portions connected in sequence, the three shell portions being a first shell portion, a second shell portion, and a third shell portion respectively. The first shell portion and the third shell portion are arranged at intervals along a second direction. The first shell portion, the second shell portion, and the third shell portion together define a cavity. The cavity is located on one side of the second shell portion along a third direction. The third direction, the second direction, and the first direction are perpendicular to each other.

[0017] According to some embodiments of the present invention, the second shell portion extends along the second direction, and both the first shell portion and the third shell portion extend along the third direction.

[0018] According to some embodiments of the present invention, the width of the cavity in the second direction is W0, the thickness of the first shell in the second direction is W1, the thickness of the third shell in the second direction is W3, and W0 ≥ W1 and / or W0 ≥ W3.

[0019] According to some embodiments of the present invention, in the third direction, the side surface of the first shell portion away from the second shell portion is a first side surface, and the side surface of the third shell portion away from the second shell portion is a third side surface. In the direction away from the second shell portion, the first side surface protrudes from the third side surface or the third side surface protrudes from the first side surface.

[0020] According to some embodiments of the present invention, the length of the first shell portion in the third direction is L1, and the length of the third shell portion in the third direction is L2, where L1 > L2 or L2 > L1.

[0021] According to some embodiments of the present invention, the housing is provided with two pole post components, the electrode assembly is connected to the pole post components, one of the two pole post components is a positive electrode and the other is a negative electrode, the two pole post components are disposed in the same housing part and located on one side of the housing part along the first direction, and the two pole post components are arranged at intervals along the extension direction of the housing part.

[0022] According to some embodiments of the present invention, the length of the first shell portion in the third direction is L1, the length of the third shell portion in the third direction is L2, L1 > L2, and both pole post components are disposed in the first shell portion.

[0023] According to some embodiments of the present invention, the housing is provided with a pressure relief valve, the two pole posts and the pressure relief valve are located on the same housing part and on one side of the housing part along the first direction, and the two pole posts and the pressure relief valve are arranged at intervals along the extension direction of the housing part.

[0024] According to some embodiments of the present invention, the housing is provided with two pole post components, the electrode assembly is connected to the pole post components, one of the two pole post components is a positive electrode and the other is a negative electrode, and the two pole post components are respectively provided on the two housing parts and located on the same side of the housing along the first direction.

[0025] According to some embodiments of the present invention, two pole post components are respectively disposed in the first shell portion and the third shell portion. In the third direction, the pole post component is located in the middle of the shell, and the two pole post components are arranged along the second direction.

[0026] According to some embodiments of the present invention, the housing is provided with a pressure relief valve, the two pole components are respectively provided in the first housing part and the third housing part, and the pressure relief valve is provided in the second housing part.

[0027] A battery pack according to a second aspect of the present invention includes: a plurality of battery cells, wherein the battery cells are battery cells according to the first aspect of the present invention described above, and the plurality of battery cells are interlocked.

[0028] According to the battery pack of this utility model embodiment, by providing the above-mentioned battery cells, the thickness of the battery cells is relatively thin, the heat dissipation effect of the electrode components inside the battery cells is improved, which is conducive to reducing the temperature rise generated during the operation of the battery cells, thereby improving the cycle life and performance of the battery cells, and thus improving the working life and performance of the battery pack; furthermore, by making multiple battery cells interlocked, the battery pack as a whole can be made more compact, which is conducive to improving the energy density of the battery pack.

[0029] According to some embodiments of the present invention, the battery pack includes a heat-conducting component, which is disposed between a plurality of battery cells in the battery pack and is thermally connected to or in thermal contact with the battery cells.

[0030] According to some embodiments of the present invention, the heat-conducting component includes a plurality of heat-conducting parts connected in sequence, with adjacent heat-conducting parts having different extending directions, and each heat-conducting part being located between the battery cells of the battery pack.

[0031] According to some embodiments of the present invention, the heat-conducting component includes a heat-conducting plate.

[0032] According to some embodiments of this utility model, the heat-conducting plate is a heat-spreading plate.

[0033] According to some embodiments of this utility model, the thickness of the heat-conducting plate is less than 3mm.

[0034] According to some embodiments of the present invention, the heat-conducting component includes a flexible heat-conducting layer, which is located between the heat-conducting plate and the battery cell.

[0035] According to some embodiments of the present invention, the battery cell includes a housing, the housing including three shell portions connected in sequence, the three shell portions being a first shell portion, a second shell portion and a third shell portion respectively, the first shell portion and the third shell portion being arranged at intervals along a second direction, the first shell portion, the second shell portion and the third shell portion together defining a cavity, the cavity being located on one side of the second shell portion along a third direction, the third direction, the second direction and the first direction intersecting each other, the battery pack including two battery cells, at least a portion of the first shell portion or the third shell portion of one battery cell being accommodated in the cavity of the other battery cell.

[0036] According to some embodiments of the present invention, at least a portion of the third housing of one of the battery cells is accommodated within the cavity of another battery cell; the two battery cells are arranged flush with at least one side along the third direction and / or the two battery cells are arranged flush with at least one side along the first direction.

[0037] According to some embodiments of this utility model, the battery pack has a rectangular shape.

[0038] A battery device according to a third aspect of the present invention includes: a housing; and a battery pack according to the second aspect of the present invention, wherein the battery pack is disposed within the housing.

[0039] The battery device according to the present invention, by providing the above-mentioned battery pack, is beneficial to improving the working life and performance of the battery device.

[0040] According to some embodiments of the present invention, there are multiple battery packs, and at least some of the battery packs are arranged along a second direction or a third direction.

[0041] According to some embodiments of the present invention, the two terminal components of the battery cell are disposed on the same housing and arranged at intervals along the third direction. The terminal components of two battery cells in the same battery pack located at the same end in the third direction are connected by a first conductive sheet. The adjacent terminal components of two adjacent battery packs arranged along the second direction or the third direction are connected by a second conductive sheet.

[0042] According to some embodiments of the present invention, the two terminal components of the battery cell are respectively disposed on the two shell portions, at least part of the battery pack is arranged along the second direction, and all the terminal components of the battery pack arranged along the second direction are arranged along the second direction.

[0043] According to some embodiments of the present invention, all terminal post components in the battery pack arranged along the second direction are arranged in a straight line; and / or, all the terminal post components in the battery pack arranged along the second direction are located in the middle of the battery pack along the third direction.

[0044] According to some embodiments of the present invention, there are multiple battery packs, and a buffer layer is provided between two adjacent battery packs.

[0045] According to some embodiments of the present invention, a thermal management component is included, the thermal management component is disposed inside the housing and located on at least one side of the battery pack along a first direction, and the battery pack is thermally connected to the thermal management component.

[0046] An electrical device according to a fourth aspect of the present invention includes: a battery device according to the third aspect of the present invention described above.

[0047] According to the embodiments of the present invention, the power device, by incorporating the aforementioned battery device, has a better working life and performance, which is beneficial to improving the power device's endurance and overall performance.

[0048] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0049] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a battery cell according to some embodiments of the present invention; Figure 2 yes Figure 1 A schematic diagram of a single battery cell from another angle; Figure 3 yes Figure 1 A schematic diagram of a single battery cell from another angle; Figure 4 yes Figure 1 Exploded view of a single battery cell in the diagram; Figure 5 yes Figure 4 A schematic diagram of the wound electrode assembly in a single battery cell; Figure 6 yes Figure 5 Enlarged view of point A in the middle; Figure 7 This is an exploded view of a battery cell according to some embodiments of the present invention; Figure 8 yes Figure 7 A schematic diagram of the stacked electrode assembly in a single battery cell; Figure 9 yes Figure 8 Enlarged view of point B in the middle; Figure 10 This is a schematic diagram of a battery pack according to some embodiments of the present invention; Figure 11 yes Figure 10 Enlarged view of point C in the middle; Figure 12 This is a schematic diagram of the arrangement of multiple battery packs in a battery device according to some embodiments of the present invention; Figure 13 yes Figure 12 Enlarged view at point D; Figure 14 This is a schematic diagram showing the arrangement of multiple battery packs in a battery device according to other embodiments of the present invention; Figure 15 This is a schematic diagram showing the arrangement of multiple two-cell battery packs in a battery device according to some embodiments of the present invention. Figure 16 This is a simplified schematic diagram of a battery device according to some embodiments of the present invention; Figure 17 This is a simplified diagram of an electrical device according to some embodiments of the present invention.

[0050] Figure label: 300. Electrical appliances; 200. Battery assembly; 201. Housing; 100. Battery pack; 10. Battery cells; 1. Housing; 1a. Housing portion; 11. First housing portion; 111. First surface; 112. Second surface; 113. First side surface; 12. Second housing portion; 121. Third surface; 122. Fourth surface; 13. Third housing portion; 131. Fifth surface; 132. Sixth surface; 133. Third side surface; 14. Cavity; 15. Pole post assembly; 16. Pressure relief valve; 2. Electrode assembly; 2a. Electrode group; 21. Winded electrode group; 21a. Winding center surface; 211. First center portion; 212. Second center portion; 213. Third center portion; 22. Stacked electrode group; 22a. Electrode portion; 221. First electrode portion; 222. Second electrode portion; 223. Third electrode portion; 23. Electrode; 231. Straight portion; 24. Diaphragm; 30. Thermally conductive component; 30a. Thermally conductive section; 31. First thermally conductive section; 32. Second thermally conductive section; 33. Third thermally conductive section; 34. Thermally conductive plate; 35. Flexible thermally conductive layer; 41. First conductive sheet; 42. Second conductive sheet; 43. Buffer layer. Detailed Implementation

[0051] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0052] The following is for reference. Figures 1-9 The battery cell 10 according to an embodiment of the present utility model is described.

[0053] Reference Figures 1-5 According to a first aspect embodiment of the present invention, a battery cell 10 includes a housing 1 and an electrode assembly 2. The housing 1 includes a plurality of shell portions 1a connected in sequence. In the projection of a reference plane, the extension directions of two adjacent shell portions 1a are different. The reference plane is perpendicular to a first direction. The first direction (for example, referring to the e1 direction in the figure) is perpendicular to the extension direction of the shell portion 1a. The electrode assembly 2 is disposed in the housing 1 and the electrode assembly 2 includes an electrode 23. The electrode 23 extends continuously from one shell portion 1a to the next adjacent shell portion 1a.

[0054] It should be explained that the direction of extension of shell 1a is the direction from one shell 1a to the next adjacent shell 1a.

[0055] It needs to be explained that the reference plane is perpendicular to the first direction. The first direction being perpendicular to the extension direction of the shell 1a means that the first direction is perpendicular to the extension direction of each shell 1a. Since the extension directions of each shell 1a are coplanar, the first direction is perpendicular to the plane, that is, the first direction is perpendicular to the extension direction of each shell 1a.

[0056] The extension directions of two adjacent shell parts 1a are different, meaning that the included angle between the extension directions of two adjacent shell parts 1a is greater than 0° and less than 180°. For example, the included angle between the extension directions of two adjacent shell parts 1a can be in the range of 60° to 120°. For example, the extension directions of two adjacent shell parts 1a are set perpendicularly.

[0057] The electrode 23 extends continuously from one shell portion 1a to the next adjacent shell portion 1a. For example, different portions of an electrode 23 may be located within multiple shell portions 1a. For instance, the shell 1 includes two shell portions 1a connected in sequence, namely a first shell portion 11 and a second shell portion 12, with the electrode 23 extending continuously from the first shell portion 11 to the second shell portion 12. As another example, the shell 1 includes three shell portions 1a connected in sequence, namely a first shell portion 11, a second shell portion 12, and a third shell portion 13, with the electrode 23 extending continuously from the first shell portion 11 to the second shell portion 12 and from the second shell portion 12 to the third shell portion 13. For example, the housing 1 includes four housing parts 1a connected in sequence. The four housing parts 1a are the first housing part 11, the second housing part 12, the third housing part 13 and the fourth housing part 1a in sequence. The electrode 23 extends continuously from the first housing part 11 to the second housing part 12, from the second housing part 12 to the third housing part 13, and from the third housing part 13 to the fourth housing part 1a.

[0058] Thus, with a fixed capacity of electrode assembly 2, when the electrode group 2a of electrode assembly 2 is a wound electrode group 21, the winding circumference of the electrode sheet 23 can be longer, resulting in a thinner electrode group 2a after winding. When the electrode group 2a of electrode assembly 2 is a stacked electrode group 22, the extension length of a single electrode sheet 23 can be longer, resulting in a thinner electrode group 2a formed by multiple stacked electrode sheets 23. This reduces the stacked thickness of the electrode sheets 23, thereby reducing the thickness of electrode assembly 2. By providing multiple shell portions 1a with different extension directions in the housing 1, the shape of electrode assembly 2 can be matched, resulting in a thinner battery cell 10.

[0059] The electrode assembly 2 inside the battery cell 10 has a smaller thickness, which helps to reduce the heat concentration inside the electrode assembly 2 and shortens the heat transfer path between the electrode 23 inside the battery cell 10 and the housing 1. In particular, it shortens the heat transfer path between the electrode 23 in the middle of the thickness direction of the electrode assembly 2 and the housing 1, so that the heat of the electrode assembly 2 can be transferred to the outside of the housing 1 more quickly for heat dissipation. This effectively improves the heat dissipation effect of the battery cell 10, helps to reduce the temperature rise generated by the battery cell 10 during operation, and thus helps to improve the cycle life and performance of the battery cell 10.

[0060] In addition, compared with cylindrical batteries, square batteries, etc., the battery cell 10 of this utility model is configured with the housing 1 including multiple shell parts 1a connected in sequence, and the extension direction of two adjacent shell parts 1a can increase the surface area of ​​the outer surface of the housing 1. Thus, the battery cell 10 has a larger heat dissipation area, allowing more heat to be transferred out through the housing 1, thereby effectively improving the heat dissipation effect of the battery cell 10.

[0061] In the description of this utility model, "multiple" means two or more.

[0062] According to the embodiment of the present invention, the battery cell 10 is configured with a housing 1 comprising a plurality of shell portions 1a connected in sequence, and the extension directions of two adjacent shell portions 1a are different in the projection of the reference plane, and the electrode 23 extends continuously from one shell portion 1a to the next adjacent shell portion 1a. In this way, with a certain capacity of the battery cell 10, it is beneficial to reduce the stacking thickness of the electrode 23, thereby reducing the thickness of the electrode assembly 2. This thinner battery cell 10 results in a thinner electrode assembly 2 inside the battery cell 10, which helps to reduce the heat concentration inside the electrode assembly 2 and shortens the heat transfer path between the electrode 23 inside the battery cell 10 and the housing 1, especially shortening the heat transfer path between the electrode 23 in the middle of the thickness direction of the electrode assembly 2 and the housing 1. This allows the heat of the electrode assembly 2 to be transferred to the outside of the housing 1 more quickly for heat dissipation, effectively improving the heat dissipation effect of the battery cell 10, reducing the temperature rise generated by the battery cell 10 during operation, and thus improving the cycle life and performance of the battery cell 10.

[0063] Reference Figures 1-4 According to some embodiments of this utility model, the thickness ratio of any two shell portions 1a is 0.8 to 1.2, the thickness direction of the shell portion 1a is perpendicular to the first direction and the thickness direction of the shell portion 1a is perpendicular to the extension direction of the shell portion 1a. For example, the thickness ratio of any two shell portions 1a can be 0.8, 0.9, 1.0, 1.1, 1.2, etc.

[0064] By setting the thickness ratio of any two shell portions 1a to 0.8~1.2, the thickness dimensions of each shell portion 1a are made relatively close, so that the structural strength of each shell portion 1a is similar, the difference in the deformation resistance between each part is small, and the overall structural strength is relatively uniform. It can also make the heat dissipation effect of the parts of the electrode assembly 2 located in each shell portion 1a similar. This can make the temperature of each part of the battery cell 10 more uniform, which is beneficial to extending the overall cycle life of the battery cell 10.

[0065] Reference Figures 1-4 According to some embodiments of the present invention, multiple shell portions 1a are coplanarized along at least one side of a first direction. For example, multiple shell portions 1a may be coplanarized along one side of the first direction, or multiple shell portions 1a may be coplanarized along one side of the first direction and also coplanarized along the other side of the first direction. By having multiple shell portions 1a coplanarized along at least one side of the first direction, at least one side of the battery cell 10 along the first direction can be formed as a flat surface, which facilitates compact stacking of multiple battery cells 10 when they are stacked.

[0066] Reference Figures 1-4 According to some embodiments of the present invention, multiple shell portions 1a have the same height dimension in the first direction. Multiple shell portions 1a with the same height dimension can reduce the processing difficulty of the shell 1, making the processing and manufacturing of the shell 1 more convenient. It can also be convenient to arrange multiple shell portions 1a on both sides in the first direction, which is convenient for stacking multiple battery cells 10 compactly.

[0067] Reference Figure 7 and Figure 8 According to some embodiments of the present invention, the electrode 23 includes a straight portion 231 located within a corresponding shell portion 1a and extending along the extension direction of the corresponding shell portion 1a. The thickness direction of the straight portion 231 is perpendicular to both the first direction and the extension direction of the corresponding shell portion 1a. For example, the shell 1 includes three shell portions 1a connected in sequence, namely a first shell portion 11, a second shell portion 12, and a third shell portion 13. The straight portion 231 located in the first shell portion 11 extends along the extension direction of the first shell portion 11, the straight portion 231 located in the second shell portion 12 extends along the extension direction of the second shell portion 12, and the straight portion 231 located in the third shell portion 13 extends along the extension direction of the third shell portion 13. Both surfaces of the straight portion 231 in the thickness direction are planar. The straight portion 231 can fit more closely to the inner wall of the shell portion 1a and can be stacked in an orderly manner in the corresponding shell portion 1a. It can fill the space in the corresponding shell portion 1a more fully, reduce the gap in the shell portion 1a, improve the space utilization rate in the shell portion 1a, and help improve the energy density of the battery cell 10.

[0068] Reference Figures 4-6According to some embodiments of the present invention, the electrode assembly 2 includes an electrode group 2a, which is a wound electrode group 21. The electrode group 2a is formed by winding a winding unit around a winding center surface 21a. The winding unit includes an electrode sheet 23. The winding center surface 21a extends continuously from one shell portion 1a to the next adjacent shell portion 1a. The winding center surface 21a includes a plurality of center portions connected in sequence. The extension directions of two adjacent center portions are different. The number of center portions is the same as the number of shell portions 1a and they correspond one-to-one. Each center portion is located in the corresponding shell portion 1a.

[0069] Each central portion extends in the same direction as the corresponding shell portion 1a. Each central portion is planar, and the central surface 21a is composed of multiple central portions extending in different directions. For example, each central portion is parallel to the first direction.

[0070] It should be explained that the direction of extension of the central part is the direction from one shell 1a to the next adjacent shell 1a.

[0071] The extension directions of two adjacent central parts are different, meaning the included angle between the extension directions of two adjacent central parts is greater than 0° and less than 180°. For example, the included angle between the extension directions of two adjacent central parts can range from 60° to 120°. For example, the extension directions of two adjacent central parts are set perpendicularly.

[0072] By continuously extending the winding center surface 21a from the previous shell portion 1a to the next adjacent shell portion 1a, and the winding center surface 21a includes a plurality of central portions connected in sequence, with the extension directions of two adjacent central portions being different, and each central portion being located within the corresponding shell portion 1a, the shape of the winding center surface 21a matches the shape of the shell 1. Thus, after the winding unit is wound around the winding center surface 21a, multiple parts of the wound pole assembly 21 formed by winding around the winding center surface 21a are located within multiple shell portions 1a and continuously extend from one shell portion 1a to the next adjacent shell portion 1a, so that the overall shape of the wound pole assembly 21 is more in line with the shape of the shell 1, and the space inside the shell 1 can be fully utilized. Since the winding center surface 21a is configured as multiple centers connected in sequence and the extension directions of two adjacent centers are different, the winding path of the electrode 23 is longer, which makes the winding circumference of the electrode 23 longer. As a result, the thickness of the electrode assembly 2a formed after winding is smaller. Thus, with a fixed capacity of the battery cell 10, the thickness dimension of the wound electrode assembly 21 can be reduced, the heat transfer path between the wound electrode assembly 21 and the housing 1 can be shortened, and the heat dissipation effect of the wound electrode assembly 21 can be improved.

[0073] Reference Figures 4-6According to some embodiments of the present invention, the electrode sheets 23 with the same polarity are integrally formed, which can improve the overall structural strength of the electrode assembly 2a and eliminate the assembly process between the electrode sheets 23 with the same polarity, thereby improving the assembly efficiency of the electrode assembly 2.

[0074] Reference Figures 7-9 According to some embodiments of the present invention, the electrode assembly 2 includes an electrode group 2a, which is a stacked electrode group 22. The electrode group 2a includes multiple layers of electrode sheets 23 stacked along the thickness direction of the shell portion 1a. The thickness direction of the shell portion 1a is perpendicular to a first direction and the thickness direction of the shell portion 1a is perpendicular to the extension direction of the shell portion 1a. Each layer of electrode sheet 23 extends continuously from one shell portion 1a to the next adjacent shell portion 1a. Each layer of electrode sheet 23 includes multiple electrode sheet portions 22a connected in sequence. The extension directions of two adjacent electrode sheet portions 22a are different. The number of electrode sheet portions 22a is the same as the number of shell portions 1a and they correspond one-to-one. Each electrode sheet portion 22a is located in the corresponding shell portion 1a.

[0075] In this configuration, each electrode portion 22a extends in the same direction as the corresponding shell portion 1a. Each electrode portion 22a can be the straight portion 231 described above, and each electrode layer 23 is composed of multiple electrode portions 22a extending in different directions. For example, each electrode portion 22a is parallel to the first direction.

[0076] It should be explained that the extension direction of the electrode portion 22a is the direction from one shell portion 1a to the next adjacent shell portion 1a.

[0077] The extension directions of two adjacent electrode portions 22a are different, meaning that the included angle between the extension directions of two adjacent electrode portions 22a is greater than 0° and less than 180°. For example, the included angle between the extension directions of two adjacent electrode portions 22a can be in the range of 60° to 120°. For example, the extension directions of two adjacent electrode portions 22a are arranged perpendicularly.

[0078] Each electrode 23 extends continuously from one shell portion 1a to the next adjacent shell portion 1a, and each electrode 23 includes multiple electrode portions 22a connected in sequence. The extension directions of two adjacent electrode portions 22a are different, and each electrode portion 22a is located in the corresponding shell portion 1a. This makes the shape of each electrode 23 match the shape of the shell 1. After multiple electrode 23s are stacked along the thickness direction of the shell portion 1a, multiple parts of the stacked electrode assembly 22 are located in multiple shell portions 1a and extend continuously from one shell portion 1a to the next adjacent shell portion 1a. This makes the overall shape of the stacked electrode assembly 22 fit the shape of the shell 1 more closely, and can make full use of the space inside the shell 1. By setting the electrode 23 as multiple electrode portions 22a connected in sequence and the extension directions of adjacent electrode portions 22a are different, the extension length of each electrode 23 can be longer. Thus, the thickness of the electrode assembly 2a formed by the multi-layer stacked electrode 23 is smaller. In this way, with a fixed capacity of the battery cell 10, the thickness of the stacked electrode assembly 22 can be reduced, the heat transfer path between the stacked electrode assembly 22 and the housing 1 can be shortened, and the heat dissipation effect of the stacked electrode assembly 22 can be improved.

[0079] Reference Figures 7-9 According to some embodiments of the present invention, each electrode 23 is an integrally formed part, which can improve the structural strength of the single-layer electrode 23 and eliminate the assembly process of multiple electrode parts 22a of the single-layer electrode 23, thereby improving the assembly efficiency of the electrode assembly 2.

[0080] Reference Figures 1-4 According to some embodiments of the present invention, the housing 1 includes three housing portions 1a connected in sequence. The three housing portions 1a are respectively a first housing portion 11, a second housing portion 12 and a third housing portion 13. The first housing portion 11 and the third housing portion 13 are arranged at intervals along a second direction (for example, refer to the e2 direction in the figure). The first housing portion 11, the second housing portion 12 and the third housing portion 13 together define a cavity 14. The cavity 14 is located on one side of the second housing portion 12 along a third direction (for example, refer to the e3 direction in the figure). The third direction, the second direction and the first direction are perpendicular to each other.

[0081] By dividing the housing 1 into a first housing portion 11, a second housing portion 12, and a third housing portion 13, with the first housing portion 11 and the third housing portion 13 arranged at intervals, and the second housing portion 12 connected between the first housing portion 11 and the third housing portion 13, and the first housing portion 11, the second housing portion 12, and the third housing portion 13 together define a cavity 14, the thickness of the battery cell 10 can be reduced under the condition that the capacity of the battery cell 10 is constant. This shortens the heat transfer path between the electrode assembly 2 inside the battery cell 10 and the outside of the housing 1, allowing the heat of the electrode assembly 2 to be conducted to the outside of the housing 1 more quickly for heat dissipation, thereby improving the heat dissipation effect of the battery cell 10.

[0082] Furthermore, compared to cylindrical and prismatic batteries, the cavity 14 is defined by the first shell portion 11, the second shell portion 12, and the third shell portion 13, which increases the outer surface area of ​​the battery cell 10. For example, the inner wall surface of the cavity 14 is the increased outer surface area of ​​the battery cell 10, thereby increasing the heat dissipation area of ​​the battery cell 10 and thus improving the heat dissipation effect of the battery cell 10.

[0083] Reference Figures 1-4 According to some embodiments of the present invention, the first shell portion 11, the second shell portion 12, and the third shell portion 13 are coplanarly disposed along at least one side of the first direction, and the first direction, the third direction, and the second direction intersect each other. For example, the first shell portion 11, the second shell portion 12, and the third shell portion 13 may be coplanarly disposed along one side of the first direction, or the first shell portion 11, the second shell portion 12, and the third shell portion 13 may be coplanarly disposed along one side of the first direction and also coplanarly disposed along the other side of the first direction. By making the first shell portion 11, the second shell portion 12, and the third shell portion 13 coplanarly disposed along at least one side of the first direction, the battery cell 10 can be formed into a flat surface along at least one side of the first direction, which facilitates the compact stacking of multiple battery cells 10.

[0084] It should be explained that the first direction being perpendicular to the extension direction of the shell 1a means that the first direction is perpendicular to the extension directions of the first shell 11, the second shell 12, and the third shell 13.

[0085] Reference Figures 4-6 According to some embodiments of the present invention, the electrode assembly 2 includes an electrode group 2a, which is a wound electrode group 21. The electrode group 2a is formed by winding a winding unit around a winding center surface 21a. The winding unit includes an electrode sheet 23 and a diaphragm 24. The winding center surface 21a extends continuously from one shell portion 1a to the next adjacent shell portion 1a. The winding center surface 21a includes three center portions connected in sequence. The three center portions are a first center portion 211, a second center portion 212, and a third center portion 213. The first center portion 211 and the third center portion 213 are arranged at intervals along a second direction. The second center portion 212 is connected between the first center portion 211 and the third center portion 213. The second center portion 212 is set at an angle to the first center portion 211 and the second center portion 212 is set at an angle to the third center portion 213. The first center portion 211 is located inside the first shell portion 11, the second center portion 212 is located inside the second shell portion 12, and the third center portion 213 is located inside the third shell portion 13.

[0086] The first central portion 211 extends in the same direction as the first shell portion 11, the second central portion 212 extends in the same direction as the second shell portion 12, and the third central portion 213 extends in the same direction as the third shell portion 13.

[0087] The winding center surface 21a includes a first center portion 211, a second center portion 212, and a third center portion 213, with the first center portion 211 located inside the first shell portion 11, the second center portion 212 located inside the second shell portion 12, and the third center portion 213 located inside the third shell portion 13. This ensures that the shape of the winding center surface 21a matches the shape of the shell 1. Thus, after the winding unit is wound around the winding center surface 21a, a portion of the wound pole assembly 21 formed by winding around the winding center surface 21a is located inside the first shell portion 11, a portion is located inside the second shell portion 12, and the remaining portion is located inside the third shell portion 13. The overall shape of the wound electrode assembly 21 is made to fit the shape of the housing 1, which can make full use of the space inside the housing 1. Since the winding center surface 21a is set as multiple centers connected in sequence and the extension directions of two adjacent centers are different, the winding path of the electrode 23 is longer, which can make the winding circumference of the electrode 23 longer. Thus, the thickness of the electrode assembly 2a formed after winding is smaller. In this way, with a certain capacity of the battery cell 10, the thickness dimension of the wound electrode assembly 21 can be reduced, the heat transfer path between the wound electrode assembly 21 and the housing 1 can be shortened, and the heat dissipation effect of the wound electrode assembly 21 can be improved.

[0088] Reference Figures 7-9 According to some embodiments of the present invention, the electrode assembly 2 includes an electrode group 2a, which is a stacked electrode group 22. The electrode group 2a includes multiple layers of electrode sheets 23 stacked along the thickness direction of the shell portion 1a. The thickness direction of the shell portion 1a is perpendicular to the first direction and the thickness direction of the shell portion 1a is perpendicular to the extension direction of the shell portion 1a. Each layer of electrode sheet 23 extends continuously from one shell portion 1a to the next adjacent shell portion 1a. Each electrode layer 23 includes three electrode portions 22a connected in sequence. The three electrode portions 22a are a first electrode portion 221, a second electrode portion 222, and a third electrode portion 223. The first electrode portion 221 and the third electrode portion 223 are arranged at intervals along a second direction. The second electrode portion 222 is connected between the first electrode portion 221 and the third electrode portion 223. The second electrode portion 222 is set at an angle to the first electrode portion 221 and the second electrode portion 222 is set at an angle to the third electrode portion 223. The first electrode portion 221 is located inside the first shell portion 11, the second electrode portion 222 is located inside the second shell portion 12, and the third electrode portion 223 is located inside the third shell portion 13.

[0089] The first electrode portion 221 extends in the same direction as the first shell portion 11, the second electrode portion 222 extends in the same direction as the second shell portion 12, and the third electrode portion 223 extends in the same direction as the third shell portion 13.

[0090] By dividing the electrode 23 into a first electrode portion 221, a second electrode portion 222, and a third electrode portion 223, with the first electrode portion 221 located inside the first shell portion 11, the second electrode portion 222 located inside the second shell portion 12, and the third electrode portion 223 located inside the third shell portion 13, the shape of each layer of electrode 23 matches the shape of the shell 1. After the multiple layers of electrode 23 are stacked along the thickness direction of the shell portion 1a, the first electrode portion 221 of the stacked electrode assembly 22 is located inside the first shell portion 11, the second electrode portion 222 is located inside the second shell portion 12, and the third electrode portion 223 is located inside the third shell portion 13. This makes the overall shape of the stacked electrode assembly 22 more closely fit the shape of the shell 1, making full use of the space inside the shell 1. Thus, with a fixed capacity of the battery cell 10, the thickness dimension of the stacked electrode assembly 22 can be reduced, shortening the heat transfer path between the stacked electrode assembly 22 and the shell 1, and improving the heat dissipation effect of the stacked electrode assembly 22.

[0091] It is understandable that the first electrode portion 221, the second electrode portion 222, and the third electrode portion 223 can all be the straight portion 231 mentioned above.

[0092] Reference Figures 1-4 According to some embodiments of the present invention, the second shell portion 12 extends along the second direction, and the first shell portion 11 and the third shell portion 13 both extend along the third direction. By having the first shell portion 11 and the third shell portion 13 extend along the third direction and be arranged at intervals along the second direction, the second shell portion 12 is disposed between the first shell portion 11 and the third shell portion 13, so that the first shell portion 11, the second shell portion 12 and the third shell portion 13 together define the cavity 14. In this way, when the capacity of the battery cell 10 is constant, the thickness of the battery cell 10 can be reduced, the heat transfer path from the electrode assembly 2 inside each shell portion 1a to the shell 1 is shortened, and the heat dissipation effect of the electrode assembly 2 is improved.

[0093] Reference Figures 1-4 According to some embodiments of this utility model, the thickness dimension of the first shell portion 11 in the second direction is W1, the thickness dimension of the second shell portion 12 in the third direction is W2, and the thickness dimension of the third shell portion 13 in the second direction is W3. The ratio of any two of W1, W2, and W3 ranges from 0.8 to 1.2. For example, the ratio of any two of W1, W2, and W3 can be 0.8, 0.9, 1.0, 1.1, 1.2, etc.

[0094] By setting the ratio of any two of the following dimensions in the second direction: thickness W1 of the first shell 11, thickness W2 of the second shell 12, and thickness W3 of the third shell 13, to a range of 0.8 to 1.2, the thickness dimensions of each shell 1a are made relatively close. This results in similar structural strength of each shell 1a, smaller differences in deformation resistance between parts, and more uniform overall structural strength. It also makes the heat dissipation effect of the parts of the electrode assembly 2 located within each shell 1a similar. This makes the temperature of each part of the battery cell 10 more uniform, thereby extending the overall cycle life of the battery cell 10.

[0095] Reference Figures 1-4 According to some embodiments of the present invention, the width dimension of the cavity 14 in the second direction is W0, the thickness dimension of the first shell portion 11 in the second direction is W1, the thickness dimension of the third shell portion 13 in the second direction is W3, and W0≥W1 and / or W0≥W3.

[0096] W0≥W1 and / or W0≥W3, including the following three cases: (1) W0≥W1; (2) W0≥W3; (3) W0≥W1 and W0≥W3.

[0097] For example, the width dimension W0 of the cavity 14 in the second direction and the thickness dimension W1 of the first shell 11 in the second direction can satisfy W0=W1 or W0 is greater than W1. By ensuring that the width dimension W0 of the cavity 14 in the second direction is not less than the thickness dimension W1 of the first shell 11 in the second direction, it is convenient to assemble the two battery cells 10 and make full use of the space inside the cavity 14, so that the battery pack 100 formed after the two battery cells 10 are assembled is compact and the space occupied is reduced.

[0098] For example, when assembling two adjacent battery cells 10, at least a portion of the first shell portion 11 of one battery cell 10 may be accommodated in the cavity 14 of the other battery cell 10. By ensuring that the width W0 of the cavity 14 in the second direction is not less than the thickness W1 of the first shell portion 11 in the second direction, at least a portion of the first shell portion 11 of one battery cell 10 can be smoothly inserted into the cavity 14 of the other battery cell 10, and the assembly between the two battery cells 10 can be completed with a smaller force.

[0099] For example, the width dimension W0 of the cavity 14 in the second direction and the thickness dimension W3 of the third shell 13 in the second direction can satisfy W0=W3 or W0 is greater than W3. By ensuring that the width dimension W0 of the cavity 14 in the second direction is not less than the thickness dimension of the third shell 13 in the second direction, it is convenient to assemble the two battery cells 10. It can also make full use of the space inside the cavity 14, so that the structure of the battery pack 100 formed after the two battery cells 10 are assembled is compact and the space occupied is reduced.

[0100] For example, when assembling two adjacent battery cells 10, at least a portion of the third shell portion 13 of one battery cell 10 may be accommodated in the cavity 14 of the other battery cell 10. By ensuring that the width W0 of the cavity 14 in the second direction is not less than the thickness W3 of the third shell portion 13 in the second direction, at least a portion of the third shell portion 13 of one battery cell 10 can be smoothly inserted into the cavity 14 of the other battery cell 10, and the assembly between the two battery cells 10 can be completed with a smaller force.

[0101] Reference Figures 1-4 According to some embodiments of the present invention, in the third direction, the side surface of the first shell portion 11 away from the second shell portion 12 is the first side surface 113, and the side surface of the third shell portion 13 away from the second shell portion 12 is the third side surface 133. In the direction away from the second shell portion 12, the first side surface 113 protrudes from the third side surface 133 or the third side surface 133 protrudes from the first side surface 113.

[0102] In the direction away from the second housing 12, the first side 113 protrudes from the third side 133 or the third side 133 protrudes from the first side 113, so that the first housing 11 and the third housing 13 form a stepped structure in the direction away from the second housing 12. In this way, when the two battery cells 10 are assembled, it can play a guiding and positioning role, prevent confusion in the assembly direction of the two battery cells 10, and also make the surfaces of the two battery cells 10 away from the second housing 1 as flat as possible. For example, the surfaces of the two battery cells 10 away from the second housing 12 can be made flat after assembly, so that the outer peripheral surfaces of the two battery cells 10 away from the second housing 12 have a flat structure, so as to facilitate the close arrangement of multiple battery cells 10 in the future.

[0103] Reference Figures 1-4According to some embodiments of the present invention, the distance between the first side 113 and the third side 133 in the third direction is d, and the ratio of W2 to d ranges from 0.8 to 1.2. For example, the ratio of the thickness W2 of the second shell portion 12 in the third direction to the distance d between the first side 113 and the third side 133 in the third direction can be 0.8, 0.9, 1.0, 1.1, 1.2, etc.

[0104] By setting the ratio of the thickness W2 of the second shell 12 in the third direction to the distance d of the first side 113 and the third side 133 in the third direction to a range of 0.8 to 1.2, the overall structure of the two battery cells 10 after assembly can be made more compact, so that the space occupied by the two battery cells 10 after assembly is as small as possible.

[0105] For example, when two battery cells 10 are assembled together, at least a portion of the third shell portion 13 of one battery cell 10 is housed within the cavity 14 of the other battery cell 10. In the third direction, the second shell portion 12 of one battery cell 10 is located in the space between the first side 113 and the third side 133. By using a ratio of the thickness W2 of the second shell portion 12 in the third direction to the distance d between the first side 113 and the third side 133 in the third direction, which is in the range of 0.8 to 1.2, the surface of the second shell portion 12 of one battery cell 10 facing away from the cavity 14 can be made as flush as possible with the first side 113 of the first shell portion 11 of the other battery cell 10. This makes the overall structure of the two battery cells 10 more compact after assembly, thereby reducing the space occupied by the two battery cells 10 after assembly.

[0106] For example, in the third direction, if the surface of the second shell 12 facing away from the cavity 14 protrudes from the first side 113 and the distance between the surface and the first side 113 is too large, it will increase the space occupied by the two battery cells 10 after assembly. By using the ratio of the thickness W2 of the second shell 12 in the third direction to the distance d of the first side 113 and the third side 133 in the third direction, which is in the range of 0.8 to 1.2, after the two battery cells 10 are assembled, the surface of the second shell 12 of one battery cell 10 facing away from the cavity 14 can be flush with the first side 113 of the first shell 11 of the other battery cell 10 as much as possible. For example, the surface of the second shell 12 of one battery cell 10 facing away from the cavity 14 can be flush with the first side 113 of the first shell 11 of the other battery cell 10 along the second direction. This makes the overall structure of the two battery cells 10 more compact after assembly, effectively reducing the overall space occupied by the two battery cells 10 after assembly.

[0107] Reference Figures 1-4 According to some embodiments of the present invention, the length of the first shell portion 11 in the third direction is L1, and the length of the third shell portion 13 in the third direction is L2, where L1 > L2 or L2 > L1. By making the length L1 of the first shell portion 11 in the third direction greater than the length L2 of the third shell portion 13 in the third direction, or by making the length L1 of the first shell portion 11 in the third direction less than the length L2 of the third shell portion 13 in the third direction, the lengths of the first shell portion 11 and the third shell portion 13 in the third direction are different. This allows the first shell portion 11 and the third shell portion 13 to form a stepped structure in the direction away from the second shell portion 12. This can play a guiding and positioning role when assembling two battery cells 10, preventing confusion in the assembly direction of the two battery cells 10. It can also make the surfaces of the two battery cells 10 facing away from the second shell portion 12 as flat as possible. For example, the surfaces of the two battery cells 10 facing away from the second shell portion 12 can be aligned after assembly, so that the outer peripheral surfaces of the two battery cells 10 facing away from the second shell portion 12 have a flat structure, which facilitates the close arrangement of multiple battery cells 10 in the future.

[0108] Reference Figures 1-4 According to some embodiments of this utility model, the ratio of (L2+W2) to L1 ranges from 0.8 to 1.2. For example, the ratio of (L2+W2) to L1 can be 0.8, 0.9, 1.0, 1.1, 1.2, etc.

[0109] By using the ratio of the sum of the length L2 of the third shell 13 in the third direction and the thickness W2 of the second shell 12 in the third direction to the length L1 of the first shell 11 in the third direction, which ranges from 0.8 to 1.2, after the two battery cells 10 are assembled together, the surface of the third shell 13 of one battery cell 10 facing away from the cavity 14 can be made as flush as possible with the first side 113 of the first shell 11 of the other battery cell 10. This makes the overall structure of the two battery cells 10 more compact after assembly, thereby reducing the space occupied by the battery pack 100 formed by assembling the two battery cells 10 together.

[0110] Reference Figures 1-3According to some embodiments of the present invention, the outer surface of the first shell portion 11 includes a first surface 111 and a second surface 112 disposed opposite to each other along a second direction, the outer surface of the second shell portion 12 includes a third surface 121 and a fourth surface 122 disposed opposite to each other along a third direction, and the outer surface of the third shell portion 13 includes a fifth surface 131 and a sixth surface 132 disposed opposite to each other along a second direction. The first surface 111, the third surface 121 and the fifth surface 131 are connected in sequence and form a cavity 14, and the second surface 112, the fourth surface 122 and the sixth surface 132 are connected in sequence.

[0111] The first surface 111, the third surface 121 and the fifth surface 131 are connected in sequence and form a cavity 14. The first surface 111, the third surface 121 and the fifth surface 131 together constitute the inner wall of the cavity 14. The second surface 112, the fourth surface 122 and the sixth surface 132 are connected in sequence.

[0112] Reference Figures 1-4 According to some embodiments of this utility model, at least one of the first surface 111, the third surface 121, and the fifth surface 131 is a plane. For example, one of the first surface 111, the third surface 121, or the fifth surface 131 may be a plane; the first surface 111 and the third surface 121, the first surface 111 and the fifth surface 131, or the third surface 121 and the fifth surface 131 may all be planes; and all three surfaces may be planes. By making at least one of the first surface 111, the third surface 121, and the fifth surface 131 a plane, the processing and manufacturing of the shell 1 can be facilitated. Compared with curved surface structures, planar structures are easier to process, thus reducing the processing difficulty of the shell 1.

[0113] For example, when the heat-conducting component 30 is disposed within the cavity 14, the contact between planes, where at least one of the first surface 111, the third surface 121, and the fifth surface 131 is a plane, can reduce the gap between the heat-conducting component 30 and the inner wall of the cavity 14 compared to curved surface contact, thereby improving heat transfer efficiency. Correspondingly, when two adjacent battery cells 10 are assembled together, a portion of the first shell 11 or the third shell 13 of one battery cell 10 is located within the cavity 14 of another battery cell 10. The contact between planes, where at least one of the first surface 111, the third surface 121, and the fifth surface 131 is a plane, can also reduce the gap between the battery cell 10 and the inner wall of the cavity 14, making the overall structure of the two adjacent battery cells 10 more compact.

[0114] Reference Figures 1-4According to some embodiments of the present invention, at least one of the second surface 112, the fourth surface 122, and the sixth surface 132 is a plane. For example, one of the second surface 112, the fourth surface 122, or the sixth surface 132 may be a plane; the second surface 112 and the fourth surface 122, the second surface 112 and the sixth surface 132, or the fourth surface 122 and the sixth surface 132 may all be planes; and all three surfaces may be planes. By making at least one of the second surface 112, the fourth surface 122, and the sixth surface 132 a plane, the manufacturing of the housing 1 can be facilitated. Compared to curved structures, planar structures are easier to manufacture, thus reducing the manufacturing difficulty of the housing 1.

[0115] In addition, the planar structure can distribute external loads across the entire plane, avoiding local stress concentration. For example, the squeezing or stacking pressure between batteries during assembly can be distributed across the entire plane by having at least one of the second surface 112, the fourth surface 122, and the sixth surface 132 as a plane, thus avoiding local stress concentration and resulting in local deformation.

[0116] Reference Figures 1-4 According to some embodiments of this utility model, the housing 1 is provided with two electrode post components 15, the electrode assembly 2 is connected to the electrode post component 15, one of the two electrode post components 15 is a positive electrode and the other is a negative electrode, the two electrode post components 15 are disposed in the same housing portion 1a and located on one side of the housing portion 1a along the first direction, and the two electrode post components 15 are arranged at intervals along the extending direction of the housing portion 1a. For example, the two electrode post components 15 can be disposed in the first housing portion 11, or the second housing portion 12, or the third housing portion 13.

[0117] By having two pole post components 15 concentrated on the same housing 1a, the assembly between the pole post component 15 and the housing 1 is more convenient.

[0118] For example, when multiple battery cells 10 are arranged, the shell portions 1a of two adjacent battery cells 10 with terminal members 15 can be brought close together to shorten the conductive connection path between the two adjacent battery cells 10.

[0119] Reference Figures 1-4 According to some embodiments of the present invention, the length of the first shell 11 in the third direction is L1, the length of the third shell 13 in the third direction is L2, L1>L2, and both pole post components 15 are disposed in the first shell 11.

[0120] Since the length L1 of the first shell 11 in the third direction is greater than the length L2 of the third shell 13 in the third direction, the space of the first shell 11 in the third direction is greater than the space of the third shell 13 in the third direction. By having two pole post components 15 both located in the first shell 11 and arranged at intervals along the extension direction of the first shell 11, the first shell 11 can support the two pole post components 15 while making full use of the length space of the first shell 11 in the third direction to separate the two pole post components 15 by a sufficient safe distance.

[0121] Reference Figures 1-4 According to some embodiments of this utility model, a pressure relief valve 16 is provided on the housing 1. The two terminal posts 15 and the pressure relief valve 16 are located on the same housing portion 1a and on one side of the housing portion 1a along the first direction. The two terminal posts 15 and the pressure relief valve 16 are arranged at intervals along the extending direction of the housing portion 1a. When the pressure difference between the inside and outside of the housing 1 is constant, for example, in the event of thermal runaway, the pressure relief valve 16 can open in time, allowing the high-temperature gas inside the housing 1 to be discharged in time, which can improve the safety of the battery cell 10.

[0122] For example, the two pole pieces 15 and the pressure relief valve 16 are disposed on the first housing portion 11, the second housing portion 12, or the third housing portion 13. By concentrating the two pole pieces 15 and the pressure relief valve 16 on one of the first housing portion 11, the second housing portion 12, or the third housing portion 13, the assembly of the pole pieces 15 and the pressure relief valve 16 with the housing 1 is more convenient, which helps to improve the assembly efficiency of the pole pieces 15 and the pressure relief valve 16 with the housing 1.

[0123] For example, the pressure relief valve 16 is located between the two pole pieces 15, which can isolate the two pole pieces 15.

[0124] For example, in some embodiments, the length of the first housing 11 in the third direction is L1, and the length of the third housing 13 in the third direction is L2, where L1 > L2. Both pole pieces 15 and the pressure relief valve 16 are located in the first housing 11, and are spaced apart along the third direction. This allows for full utilization of the length space of the first housing 11 in the third direction.

[0125] Reference Figure 14According to some embodiments of this utility model, the housing 1 is provided with two electrode post components 15, the electrode assembly 2 is connected to the electrode post component 15, one of the two electrode post components 15 is a positive electrode and the other is a negative electrode, and the two electrode post components 15 are respectively disposed on two housing portions 1a and located on the same side of the housing 1 along the first direction. For example, the two electrode post components 15 can be respectively disposed on the first housing portion 11 and the third housing portion 13; or, the two electrode post components 15 can be respectively disposed on the first housing portion 11 and the second housing portion 12; or, the two electrode post components 15 can be respectively disposed on the second housing portion 12 and the third housing portion 13.

[0126] By having two terminal components 15 respectively disposed on the two housing portions 1a and located on the same side of the housing 1 along the first direction, the two terminal components 15 can be spaced apart, so that there is a sufficient safe distance between the two terminal components 15 of the battery cell 10.

[0127] In addition, when multiple battery cells 10 are arranged, the housing portion 1a with the terminal post 15 can be brought closer together to shorten the conductive connection path between two adjacent battery cells 10.

[0128] Reference Figure 14 According to some embodiments of the present invention, two terminal components 15 are respectively disposed on the first housing portion 11 and the third housing portion 13. In the third direction, the terminal component 15 is located in the middle of the housing 1. The two terminal components 15 are arranged along the second direction, so that the two terminal components 15 of the battery cell 10 can be separated by a sufficient distance, and the electrical connection of the terminal components 15 between multiple battery cells 10 is convenient.

[0129] Reference Figure 14 According to some embodiments of this utility model, a pressure relief valve 16 is provided on the housing 1, two terminal components 15 are respectively located in the first housing portion 11 and the third housing portion 13, and the pressure relief valve 16 is located in the second housing portion 12. When the pressure difference between the inside and outside of the housing 1 is constant, for example, in the event of thermal runaway, the pressure relief valve 16 can open in time, allowing the high-temperature gas inside the housing 1 to be discharged promptly, thus improving the safety of the battery cell 10. By having the two terminal components 15 respectively located in the first housing portion 11 and the third housing portion 13, and the pressure relief valve 16 located in the second housing portion 12, the pressure relief valve 16 can be separated from the terminal components 15. This prevents the high-temperature gas discharged from the pressure relief valve 16 from affecting the terminal components 15 when the pressure relief valve 16 opens to discharge the high-temperature gas inside the housing 1.

[0130] Reference Figures 10-13 According to a second aspect embodiment of the present invention, the battery pack 100 includes a plurality of battery cells 10, wherein the battery cells 10 are the same as those in the first aspect embodiment of the present invention, and the plurality of battery cells 10 are interlocked.

[0131] It is understood that, since the housing 1 of the battery cell 10 includes multiple housing portions 1a extending in different directions, and the exterior of the battery cell 10 has a cavity 14 or groove structure, when assembling multiple battery cells 10, a portion of one battery cell 10 can be accommodated in the cavity 14 or groove of another battery cell 10, thereby allowing multiple battery cells 10 to be fastened together to form a battery pack 100. This not only forms a battery pack 100, but also makes the structure of the battery pack 100 compact through the fastening between the battery cells 10.

[0132] According to the embodiment of the present invention, the battery pack 100, by providing the aforementioned battery cells 10, has a thinner thickness, which improves the heat dissipation effect of the electrode assembly 2 inside the battery cell 10. This helps to reduce the temperature rise generated when the battery cell 10 is working, thereby improving the cycle life and performance of the battery cell 10, and thus improving the working life and performance of the battery pack 100. Furthermore, by interlocking multiple battery cells 10, the battery pack 100 can be made more compact, which helps to improve the energy density of the battery pack 100.

[0133] Reference Figures 10-13 According to some embodiments of the present invention, the battery pack 100 includes a heat-conducting component 30, which is disposed between a plurality of battery cells 10 in the battery pack 100 and is thermally connected or in thermal contact with the battery cells 10. Each battery cell 10 in the battery pack 100 is thermally connected or in thermal contact with the heat-conducting component 30.

[0134] For example, the battery pack 100 includes a heat-conducting component 30 and two battery cells 10. The heat-conducting component 30 is disposed between the two battery cells 10 of the battery pack 100 and is thermally connected or in thermal contact with the battery cells 10.

[0135] The heat-conducting component 30 can conduct heat transfer within the battery cell 10. The heat generated by the battery cell 10 can be transferred to the heat-conducting component 30. In this way, the heat generated by the battery cell 10 can not only be transferred to the outside through the casing 1, but also quickly transferred to the outside through the heat-conducting component 30, which helps to improve the heat dissipation efficiency of the battery cell 10. By placing the heat-conducting component 30 between multiple battery cells 10 in the battery pack 100, the heat-conducting component 30 can simultaneously conduct heat from multiple battery cells 10 to the outside of the battery pack 100, thereby improving the heat conduction efficiency of the heat-conducting component 30.

[0136] Reference Figures 10-13 According to some embodiments of the present invention, the heat-conducting component 30 includes a plurality of heat-conducting parts 30a connected in sequence, the extension directions of two adjacent heat-conducting parts 30a are different, and each heat-conducting part 30a is located between the battery cells 10 of the battery pack 100.

[0137] Each battery cell 10 includes a housing 1, which includes a plurality of heat-conducting parts 30a connected in sequence. In the projection of a reference plane, the extension directions of two adjacent housing parts 1a are different. The reference plane is perpendicular to a first direction. When multiple battery cells 10 are arranged in a group, the multiple battery cells 10 are interlocked. The heat-conducting component 30 includes a plurality of heat-conducting parts 30a connected in sequence, and the extension directions of adjacent heat-conducting parts 30a are different, so that the shape of the heat-conducting component 30 matches the shape of the battery cell 10. This allows heat-conducting parts 30a to be provided between different battery cells 10, thereby effectively increasing the heat-conducting contact area between the heat-conducting component 30 and the battery pack 100 and improving the heat dissipation efficiency of the battery pack 100.

[0138] Reference Figures 10-13 According to some embodiments of the present invention, the battery pack 100 includes a heat-conducting component 30 and two battery cells 10. Each battery cell 10 includes a housing 1, which includes three shell portions 1a connected in sequence. The three shell portions 1a are respectively a first shell portion 11, a second shell portion 12, and a third shell portion 13. The first shell portion 11 and the third shell portion 13 are arranged at intervals along a second direction. The first shell portion 11, the second shell portion 12, and the third shell portion 13 together define a cavity 14. The cavity 14 is located on one side of the second shell portion 12 along a third direction. The third direction, the second direction, and the first direction intersect each other. A portion of the third shell portion 13 of one battery cell 10 is accommodated in the cavity 14 of the other battery cell 10.

[0139] The heat-conducting component 30 includes multiple heat-conducting parts 30a, each including a first heat-conducting part 31, a second heat-conducting part 32, and a third heat-conducting part 33. There can be two first heat-conducting parts 31, two third heat-conducting parts 33, and one second heat-conducting part 32. The third heat-conducting part 33 connects the first heat-conducting parts 31 and the second heat-conducting parts 32. The first heat-conducting part 31 is located between the first shell portion 11 of one battery cell 10 and the third shell portion 13 of another battery cell 10. The second heat-conducting part 32 is located between the third shell portions 13 of two battery cells 10. The third heat-conducting part 33 is located between the second shell portion 12 of one battery cell 10 and the third shell portion 13 of another battery cell 10.

[0140] With the first heat-conducting part 31 located between the first shell portion 11 of one battery cell 10 and the third shell portion 13 of the other battery cell 10, the second heat-conducting part 32 located between the third shell portions 13 of the two battery cells 10, and the third heat-conducting part 33 located between the second shell portion 12 of one battery cell 10 and the third shell portion 13 of the other battery cell 10, the heat-conducting component 30 can be disposed between the two battery cells 10 and the heat-conducting component 30 is thermally connected to the inner wall of the cavity 14 of the two battery cells 10. This effectively increases the thermal contact area between the heat-conducting component 30 and the two battery cells 10, improves the thermal conductivity of the two battery cells 10, and also makes the temperature of the battery cells 10 as uniform as possible in the first direction, thus extending the service life of the battery cells 10.

[0141] Reference Figures 10-13 According to some embodiments of the present invention, the heat-conducting component 30 includes a heat-conducting plate 34. The heat-conducting plate 34 can conduct heat from the battery cell 10 to the outside of the battery pack 100.

[0142] Reference Figures 10-13 According to some embodiments of the present invention, the heat-conducting plate 34 is a heat-spreading plate. Since the heat-spreading plate itself has a high thermal conductivity, the heat-conducting plate 34 can have a high thermal conductivity. Moreover, the phase change heat transfer performance of the heat-spreading plate itself can diffuse heat to the entire plate surface in a short time, which can make the temperature distribution of the entire heat-conducting plate 34 more uniform. This can reduce the temperature difference of the battery cell 10 at different locations, thereby helping to extend the cycle life of the battery cell 10.

[0143] For example, if a battery cell 10 is locally heated, the heat spreader can quickly distribute the heat to the entire surface of the plate, preventing the battery cell 10 from being damaged due to local overheating. It can also reduce the temperature difference between different locations of the battery cell 10 and extend the cycle life of the battery cell 10.

[0144] Reference Figures 10-13 According to some embodiments of this utility model, the thickness of the heat-conducting plate 34 is less than 3 mm. For example, the thickness of the heat-conducting plate 34 can be 0.3 mm, 0.4 mm, 0.8 mm, 1.5 mm, 2.2 mm, 3 mm, etc.

[0145] For example, the heat-conducting plate 34 can be a metal plate. For example, the heat-conducting plate 34 can be an aluminum plate or a copper plate.

[0146] By making the thickness of the heat-conducting plate 34 less than 3mm, the heat-conducting plate 34 can be placed between two adjacent battery cells 10 to quickly conduct heat from the battery cell 10 to the outside of the battery pack 100. At the same time, it can avoid the battery pack 100 occupying too much space due to the excessive thickness of the heat-conducting plate 34, so that the overall space occupied by the battery pack 100 is smaller. In this way, with a fixed size of the housing 201 of the battery device 200, as many battery packs 100 as possible can be placed to improve the energy density of the battery device 200.

[0147] Reference Figures 10-13 According to some embodiments of this utility model, the thickness of the heat-conducting plate 34 ranges from 0.3 mm to 2.5 mm. For example, the thickness of the heat-conducting plate 34 can be 0.3 mm, 0.4 mm, 0.8 mm, 2.0 mm, 2.2 mm, etc.

[0148] By using a thickness range of 0.3mm to 2.5mm for the heat-conducting plate 34, a good balance can be struck between the structural strength of the heat-conducting plate 34 and the space it occupies. This ensures that the heat-conducting plate 34 has a certain structural strength to reduce the possibility of damage, while also minimizing the space it occupies.

[0149] Reference Figures 10-13 According to some embodiments of this utility model, the heat-conducting component 30 includes a flexible heat-conducting layer 35, which is located between the heat-conducting plate 34 and the battery cell 10. During the operation of the battery pack 100, the battery cell 10 may expand. By providing a flexible heat-conducting layer 35 between the heat-conducting plate 34 and the battery cell 10, the expansion force can be effectively alleviated, thereby reducing the compressive force between the battery cell 10 and the heat-conducting plate 34 and reducing the possibility of deformation of the heat-conducting plate 34 caused by this compressive force. By including a flexible heat-conducting layer 35, the overall structural strength of the heat-conducting component 30 can also be improved. Furthermore, by providing a flexible heat-conducting layer 35 between the heat-conducting plate 34 and the battery cell 10, the flexible heat-conducting layer 35 can better fill the gap between the heat-conducting plate 34 and the battery cell 10, which is beneficial to reducing the thermal resistance between the battery cell 10 and the heat-conducting plate 34.

[0150] The flexible thermal conductive layer 35 can be made of an insulating material.

[0151] Reference Figures 10-13 According to some embodiments of the present invention, the flexible thermal conductive layer 35 is a thermally conductive structural adhesive layer or a thermally conductive silicone layer, which can play a role in thermal conductivity and insulation, and better avoid direct contact between the thermal conductive plate 34 and the battery cell 10 and the resulting electrical connection.

[0152] Reference Figures 10-13According to some embodiments of the present invention, the battery pack 100 includes two battery cells 10, each battery cell 10 including a housing 1, the housing 1 including three shell portions 1a connected in sequence, the three shell portions 1a being a first shell portion 11, a second shell portion 12 and a third shell portion 13 respectively. The first shell portion 11 and the third shell portion 13 are arranged at intervals along a second direction, and the first shell portion 11, the second shell portion 12 and the third shell portion 13 together define a cavity 14, the cavity 14 being located on one side of the second shell portion 12 along a third direction, the third direction, the second direction and the first direction intersect each other, and at least a portion of the first shell portion 11 or the third shell portion 13 of one battery cell 10 is accommodated in the cavity 14 of the other battery cell 10.

[0153] In one of the battery cells 10, at least a portion of the first housing portion 11 or the third housing portion 13 is accommodated within the cavity 14 of the other battery cell 10. This can include situations where, for example, a portion of the first housing portion 11 or the third housing portion 13 of one battery cell 10 is accommodated within the cavity 14 of the other battery cell 10; or, for another example, the entire first housing portion 11 or the third housing portion 13 of one battery cell 10 is accommodated within the cavity 14 of the other battery cell 10.

[0154] By having at least a portion of the first housing portion 11 or the third housing portion 13 of one of the battery cells 10 housed within the cavity 14 of the other battery cell 10, the space within the cavity 14 can be fully utilized, making the overall structure of the battery pack 100 more compact and reducing the space occupied by the battery pack 100 as a whole.

[0155] Reference Figures 10-13 According to some embodiments of the present invention, at least a portion of the third housing 13 of one battery cell 10 is accommodated in the cavity 14 of another battery cell 10, and the two battery cells 10 are arranged flush with at least one side along a third direction and / or the two battery cells 10 are arranged flush with at least one side along a first direction.

[0156] The two battery cells 10 are aligned with at least one side of a third direction and / or aligned with at least one side of a first direction, including the following cases: for example, the two battery cells 10 are aligned with at least one side of a third direction; for example, the two battery cells 10 are aligned with at least one side of a first direction; for example, the two battery cells 10 are aligned with at least one side of a third direction and also aligned with at least one side of a first direction.

[0157] The arrangement of two battery cells 10 flush with each other on at least one side of a third direction includes the following cases: for example, the two battery cells 10 are flush with each other on one side of a third direction; for example, the two battery cells 10 are flush with each other on one side of a third direction and the two battery cells 10 are flush with each other on the other side of a third direction.

[0158] Two battery cells 10 are arranged flush with at least one side along the first direction, including the following cases: for example, two battery cells 10 are arranged flush with one side along the first direction; for example, two battery cells 10 are arranged flush with one side along the first direction and two battery cells 10 are arranged flush with the other side along the first direction.

[0159] The third housing 13 of one of the battery cells 10 is housed in the cavity 14 of the other battery cell 10, which makes full use of the space in the cavity 14, making the overall structure of the battery pack 100 more compact and reducing the space occupied by the battery pack 100 as a whole.

[0160] By aligning two battery cells 10 with at least one side along a third direction, the outer surface of the battery pack 100 along at least one side along a third direction can be made flat. When multiple battery packs 100 are arranged, for example, when two adjacent battery packs 100 are arranged along one side along a third direction, the two adjacent battery packs 100 can be fitted more tightly, so that the overall structure of the multiple battery packs 100 is more compact, and the gap between adjacent battery packs 100 is reduced due to local protrusions on the outer surface of the battery pack 100 along at least one side along a third direction.

[0161] By aligning two battery cells 10 with at least one side along the first direction, the outer surface of the battery pack 100 along at least one side of the first direction can be flat. When multiple battery packs 100 are arranged, for example, when two adjacent battery packs 100 are arranged along one side of the first direction, the two adjacent battery packs 100 can be fitted more tightly, so that the overall structure of the multiple battery packs 100 is more compact, and the gap between adjacent battery packs 100 is reduced due to the local protrusion of the outer surface of the battery pack 100 along at least one side of the first direction.

[0162] Reference Figures 10-13 According to some embodiments of this utility model, the battery pack 100 is rectangular in shape. By making the battery pack 100 rectangular, the battery pack 100 formed by the snap-fitting of multiple battery cells 10 has a regular shape, facilitating the arrangement of multiple battery packs 100. This allows for a more compact arrangement of the multiple battery packs 100, making full use of the space within the housing 201 to accommodate more battery packs 100, thereby improving the energy density of the battery device 200.

[0163] Reference Figure 10 , Figure 12 , Figure 14 , Figure 15 and Figure 16 The battery device 200 according to the third aspect embodiment of the present invention includes a housing 201 and a battery pack 100 according to the second aspect embodiment of the present invention, wherein the battery pack 100 is disposed inside the housing 201.

[0164] The battery device 200 according to the present utility model embodiment, by providing the above-mentioned battery pack 100, is beneficial to improving the working life and performance of the battery device 200.

[0165] Reference Figure 10 , Figure 12 , Figure 14 and Figure 15 According to some embodiments of the present invention, there are multiple battery packs 100, and at least some of the battery packs 100 are arranged along a second direction or a third direction. The arrangement of at least some of the battery packs 100 along the second direction or a third direction can include the following situations: for example, some of the battery packs 100 may be arranged along the second direction or a third direction; or, for another example, all of the battery packs 100 may be arranged along the second direction or a third direction.

[0166] By arranging at least some of the battery packs 100 along a second or third direction, the space in the second or third direction can be fully utilized, allowing the multiple battery packs 100 to be arranged more closely, thus reducing the overall space occupied by the multiple battery packs 100.

[0167] For example, the battery device 200 includes a housing 201, which is a cuboid extending along a second direction or a third direction. By arranging at least some of the battery packs 100 along the second direction or the third direction, given a fixed size of the housing 201, as many battery packs 100 as possible can be placed inside the cuboid housing 201. For example, some of the battery packs 100 can be arranged along the second direction and another part of the battery packs 100 can be arranged along the third direction to fill the space inside the housing 201 as much as possible, thereby increasing the overall energy density of the battery device 200.

[0168] Reference Figure 10 , Figure 12 and Figure 15According to some embodiments of the present invention, the battery pack 100 includes two battery cells 10. The two terminal posts 15 of the battery cells 10 are disposed in the same housing 1a and arranged at intervals along a third direction. The terminal posts 15 of the two battery cells 10 in the same battery pack 100 located at the same end in the third direction are connected by a first conductive sheet 41. The adjacent terminal posts 15 of two adjacent battery packs 100 arranged in the second direction or the third direction are connected by a second conductive sheet 42. This makes the distance between the terminal posts 15 of the two battery cells 10 in the same battery pack 100 located at the same end in the third direction shorter, so that the size of the first conductive sheet 41 is shorter and the cost of the first conductive sheet 41 is reduced. Correspondingly, the distance between the adjacent terminal posts 15 of two adjacent battery packs 100 is shorter, so that the size of the second conductive sheet 42 is shorter and the cost of the second conductive sheet 42 is reduced.

[0169] Reference Figure 12 and Figure 14 According to some embodiments of this utility model, the two terminal posts 15 of the battery cell 10 are respectively disposed on two shell portions 1a, and at least a portion of the battery pack 100 is arranged along the second direction. All terminal posts 15 in the battery pack 100 arranged along the second direction are also arranged along the second direction. By arranging all terminal posts 15 in the battery pack 100 along the second direction, multiple terminal posts 15 can be arranged along the second direction, which helps to shorten the distance between the terminal posts 15 of the battery cells 10 and facilitates the connection of the terminal posts 15 between the battery cells 10. Furthermore, when installing the conductive sheet for connecting two adjacent terminal posts 15, the operation direction is unidirectional, which helps to improve assembly efficiency.

[0170] Reference Figure 12 and Figure 14 According to some embodiments of this utility model, all terminal post components 15 in the battery pack 100 arranged along the second direction are arranged in a straight line. This makes the connection path between two adjacent terminal post components 15 a straight line segment, resulting in a shorter length of the conductive sheet used to connect the two adjacent terminal post components 15, a simpler structure, and no need for bending or detouring. For example, the length of the conductive sheet can correspond to the straight-line distance between two adjacent terminal post components 15, which helps to reduce the cost of the conductive sheet. Furthermore, when assembling the conductive sheet to the terminal post component 15, the conductive sheet can be directly installed to the corresponding terminal post component 15 along a straight line without adjusting the angle. For example, in automated production, a robotic arm or tooling can complete the assembly of the conductive sheet according to a fixed straight-line trajectory, which can reduce the assembly difficulty and improve the assembly efficiency.

[0171] Reference Figure 14According to some embodiments of the present invention, all terminal post components 15 of the battery pack 100 arranged along the second direction are located in the middle of the battery pack 100 along the third direction, which is beneficial to shorten the distance between the terminal post components 15 between the battery cells 10 and facilitates the connection of the terminal post components 15 between the battery cells 10.

[0172] Reference Figure 12 and Figure 13 According to some embodiments of this utility model, there are multiple battery packs 100, and a buffer layer 43 is provided between two adjacent battery packs 100. During the operation of the battery pack 100, the battery pack 100 may expand. By providing a buffer layer 43 between two adjacent battery packs 100, the expansion force can be effectively relieved, thereby reducing the compressive force between the two adjacent battery packs 100 and reducing the possibility that this compressive force will cause the casing 1 of the battery pack 100 to deform.

[0173] In addition, the buffer layer 43 can also insulate the two adjacent battery packs 100, preventing the two battery packs 100 from directly contacting each other and forming an electrical connection. It can also insulate heat, preventing the heat generated by the two adjacent battery packs 100 from interfering with each other.

[0174] For example, the buffer layer 43 can be foam or structural adhesive. The buffer layer 43 can use its own elastic deformation to relieve the squeezing pressure between adjacent battery packs 100.

[0175] Reference Figure 12 According to some embodiments of the present invention, the battery device 200 includes a thermal management component, which is disposed within the housing 201 and located on at least one side of the battery pack 100 along a first direction. The battery pack 100 is thermally connected to the thermal management component. For example, the thermal management component may be located on one side of the battery pack 100 along the first direction, or the battery pack 100 may have thermal management components on both sides along the first direction.

[0176] The heat pipe component may include a liquid cooling plate, which has a heat exchange medium flow channel. The heat exchange medium flowing in the heat management component can absorb the heat generated by the battery cell 10 and carry away the heat through flow.

[0177] The battery cells 10 of the battery pack 100 are thermally connected or in thermal contact with the thermal management component, and the heat generated by the battery cells 10 can be transferred to the thermal management component. When the battery pack 100 includes the aforementioned thermally conductive component 30, the thermally conductive component 30 is thermally connected or in thermal contact with the thermal management component, and the heat absorbed by the thermally conductive component 30 from the battery cells 10 is transferred to the thermal management component.

[0178] During the operation of the battery pack 100, the battery pack 100 generates heat. The thermal management component is located on at least one side of the battery pack 100 along the first direction and is thermally connected to the battery pack 100. The thermal management component can absorb the heat generated by the battery pack 100, thereby completing the temperature regulation function of the battery pack 100.

[0179] Reference Figure 16 and Figure 17 The electrical device 300 according to the fourth aspect embodiment of the present invention includes the battery device 200 according to the third aspect embodiment of the present invention.

[0180] Alternatively, the electrical device 300 can be an energy storage system or a vehicle.

[0181] According to the embodiment of the present utility model, the power device 300, by providing the above-mentioned battery device 200, has a better working life and performance, which is conducive to improving the battery life of the power device 300 and improving the performance of the power device 300.

[0182] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0183] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0184] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0185] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0186] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0187] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: A housing, comprising a plurality of shell portions connected in sequence, wherein in the projection of a reference plane, the extension directions of two adjacent shell portions are different, the reference plane being perpendicular to a first direction, and the first direction being perpendicular to the extension direction of the shell portions; An electrode assembly disposed within the housing and comprising an electrode sheet extending continuously from one portion of the housing to the next adjacent portion of the housing.

2. The battery cell according to claim 1, characterized in that, The thickness ratio of any two of the shell portions is 0.8 to 1.2, and the thickness direction of the shell portion is perpendicular to the first direction and perpendicular to the extension direction of the shell portion; and / or, the electrode includes a straight portion located within the corresponding shell portion and extending along the extension direction of the corresponding shell portion, the thickness direction of the straight portion being perpendicular to both the first direction and the extension direction of the corresponding shell portion.

3. The battery cell according to claim 1, characterized in that, The plurality of said shell portions are coplanarly arranged along at least one side of the first direction; and / or, the plurality of said shell portions have the same height dimension in the first direction.

4. The battery cell according to claim 1, characterized in that, The electrode assembly includes an electrode group, which is a wound electrode group. The electrode group is formed by winding a winding unit around a winding center surface. The winding unit includes the electrode sheet. The winding center surface extends continuously from one shell portion to the next adjacent shell portion. The winding center surface includes a plurality of sequentially connected center portions. The extension directions of two adjacent center portions are different. The number of center portions is the same as the number of shell portions and they correspond one-to-one. Each center portion is located in the corresponding shell portion. Alternatively, the electrode assembly may include an electrode group, which is a stacked electrode group. The electrode group includes multiple layers of electrode sheets stacked along the thickness direction of the shell portion. The thickness direction of the shell portion is perpendicular to the first direction and perpendicular to the extension direction of the shell portion. Each layer of electrode sheets extends continuously from one shell portion to the next adjacent shell portion. Each layer of electrode sheets includes multiple electrode sheet portions connected in sequence. The extension directions of two adjacent electrode sheet portions are different. The number of electrode sheet portions is the same as the number of shell portions and they correspond one-to-one. Each electrode sheet portion is located within the corresponding shell portion.

5. The battery cell according to any one of claims 1-4, characterized in that, The housing includes three shell portions connected in sequence, namely a first shell portion, a second shell portion, and a third shell portion. The first shell portion and the third shell portion are arranged at intervals along a second direction. The first shell portion, the second shell portion, and the third shell portion together define a cavity. The cavity is located on one side of the second shell portion along a third direction. The third direction, the second direction, and the first direction are perpendicular to each other.

6. The battery cell according to claim 5, characterized in that, The second shell portion extends along the second direction, and both the first shell portion and the third shell portion extend along the third direction.

7. The battery cell according to claim 5, characterized in that, The width of the cavity in the second direction is W0, the thickness of the first shell in the second direction is W1, and the thickness of the third shell in the second direction is W3, where W0 ≥ W1 and / or W0 ≥ W3.

8. The battery cell according to claim 7, characterized in that, In the third direction, the surface of the first shell portion away from the second shell portion is a first side surface, and the surface of the third shell portion away from the second shell portion is a third side surface. In the direction away from the second shell portion, the first side surface protrudes from the third side surface or the third side surface protrudes from the first side surface; and / or, the length dimension of the first shell portion in the third direction is L1, and the length dimension of the third shell portion in the third direction is L2, where L1 > L2 or L2 > L1.

9. The battery cell according to claim 5, characterized in that, The housing is provided with two pole post components, and the electrode assembly is connected to the pole post components. One of the two pole post components is a positive electrode and the other is a negative electrode. The two pole post components are located on the same housing part and on one side of the housing part along the first direction. The two pole post components are arranged at intervals along the extension direction of the housing part.

10. The battery cell according to claim 9, characterized in that, The length of the first housing portion in the third direction is L1, and the length of the third housing portion in the third direction is L2, where L1 > L2. Both pole post components are located in the first housing portion; and / or, a pressure relief valve is provided on the housing, and the two pole post components and the pressure relief valve are located in the same housing portion and on one side of the housing portion along the first direction. The two pole post components and the pressure relief valve are arranged at intervals along the extension direction of the housing portion.

11. The battery cell according to claim 5, characterized in that, The housing is provided with two pole post components, and the electrode assembly is connected to the pole post components. One of the two pole post components is a positive electrode and the other is a negative electrode. The two pole post components are respectively provided on the two housing parts and located on the same side of the housing along the first direction.

12. The battery cell according to claim 9, characterized in that, The two pole members are respectively disposed in the first housing portion and the third housing portion. In the third direction, the pole members are located in the middle of the housing, and the two pole members are arranged along the second direction; or, the housing is provided with a pressure relief valve, the two pole members are respectively disposed in the first housing portion and the third housing portion, and the pressure relief valve is disposed in the second housing portion.

13. A battery pack, characterized in that, include: Multiple battery cells, wherein the battery cells are according to any one of claims 1-12, and the multiple battery cells are interlocked.

14. The battery pack according to claim 13, characterized in that, It includes a heat-conducting component, which is disposed between the plurality of battery cells in the battery pack and is thermally connected to or in thermal contact with the battery cells.

15. The battery pack according to claim 14, characterized in that, The heat-conducting component includes a plurality of heat-conducting parts connected in sequence, with adjacent heat-conducting parts having different extension directions, and each heat-conducting part being located between the battery cells of the battery pack.

16. The battery pack according to claim 14, characterized in that, The heat-conducting component includes a heat-conducting plate, which is a heat-spreading plate.

17. The battery pack according to claim 16, characterized in that, The heat-conducting component includes a heat-conducting plate and a flexible heat-conducting layer, wherein the flexible heat-conducting layer is located between the heat-conducting plate and the battery cell.

18. The battery pack according to any one of claims 13-17, characterized in that, The battery cell is a battery cell according to any one of claims 5-12, and the battery pack includes two of the battery cells, wherein at least a portion of the first or third housing portion of one of the battery cells is accommodated within the cavity of the other battery cell.

19. A battery device, characterized in that, include: Box; The battery pack according to any one of claims 13-18 is disposed within the housing.

20. The battery device according to claim 19, characterized in that, The battery packs are multiple, and at least some of the battery packs are arranged along a second direction or a third direction.

21. The battery device according to claim 20, characterized in that, The two terminal components of the battery cell are disposed in the same housing and arranged at intervals along the third direction. In the same battery pack, the terminal components of two battery cells located at the same end in the third direction are connected by a first conductive sheet. The adjacent terminal components of two adjacent battery packs arranged along the second direction or the third direction are connected by a second conductive sheet. Alternatively, the two terminal components of the battery cell are respectively disposed in two housings, at least part of the battery pack is arranged along the second direction, and all the terminal components of the battery pack arranged along the second direction are arranged along the second direction.

22. The battery device according to claim 19, characterized in that, The battery packs are multiple, with a buffer layer between two adjacent battery packs; and / or, include a thermal management component, which is disposed inside the housing and located on at least one side of the battery pack along the first direction, and the battery pack is thermally connected or in thermal contact with the thermal management component.

23. An electrical appliance, characterized in that, include: The battery device according to any one of claims 19-22.

Images