Battery pack and vehicle

Abstract

A single-cell battery, a battery pack, and a vehicle. The single-cell battery includes a housing, an electrode plate, a tab, a current collector, and a pole. An accommodation space is defined within the housing. The electrode plate is disposed within the accommodation space and has at least a first surface and a second surface. A tab is provided on the electrode plate and includes a first section and a second section associated with each other. The first section extends from the first surface of the electrode plate, the current collector is provided on the first section, and the second section extends from the second surface of the electrode plate. The pole is provided on the current collector and extends from the housing.

Description

Technical Field

[0001] Cross - reference to Related Applications This disclosure is filed based on Chinese Patent Application No. 202211003310.X filed on Friday, August 19, 2022, and claims priority thereto, and the entire disclosure thereof is incorporated herein by reference.

[0002] This disclosure relates to the technical field of batteries, and in particular, to battery cells, battery packs having battery cells, and vehicles having battery packs.

Background Art

[0003] The tabs of batteries in related technologies are conventional tabs with a structure provided at the width - side end of the electrode plate. The length of the length - side end of the tab is shorter than the length of the width - side end of the tab, so the area is limited. As a result, the current - passing area of the tab and the pole post are small, which brings limitations to the rapid - charging ability of the battery.

Summary of the Invention

Problems to be Solved by the Invention

[0004] One object of this disclosure is to provide a battery cell for solving the technical problem of the limitation of the rapid - charging ability of a battery having a conventional tab in related technologies.

Means for Solving the Problems

[0005] A battery cell is provided according to a first aspect of the present disclosure. The battery cell includes a housing in which a housing space is defined therein; an electrode plate disposed within the housing space and having at least a first surface and a second surface; a tab and a current collector, wherein the tab is provided on the electrode plate and includes a first section and a second section relating to each other, the first section extending from the first surface of the electrode plate, and the current collector is provided on the first section and the second section extending from the second surface of the electrode plate to transmit current between the second section and the second surface; and an electrode post provided on the current collector and extending from the housing.

[0006] In this disclosure, at least one pole column is a sheet-like structure.

[0007] In this disclosure, the electrode plate has edges extending in a first direction, a second direction, and a third direction. The first and second directions define a first plane, the first and third directions define a second plane, and the second and third directions define a third plane. The first and second planes are connected, the first plane is parallel to the third plane, and the second plane is parallel to the second plane.

[0008] In this disclosure, the surface area of ​​the second surface is larger than the surface area of ​​the first surface.

[0009] In this disclosure, the electrode poles include a positive electrode pole and a negative electrode pole. The second section corresponding to the positive electrode pole is located at one end of the electrode plate in a second direction. The second section corresponding to the negative electrode pole is located at the other end of the electrode plate in a second direction.

[0010] In this disclosure, the electrode poles include a positive electrode pole and a negative electrode pole. The second section corresponding to the positive electrode pole and the second section corresponding to the negative electrode pole are located at the same end of the electrode plate in a second direction and spaced apart in a first direction.

[0011] In this disclosure, the positive electrode pole and the negative electrode pole are located at the same end of the electrode plate in a first direction.

[0012] In this disclosure, the positive electrode pole is located at one end of the electrode plate in a first direction, and the negative electrode pole is located at the other end of the electrode plate in a first direction.

[0013] In this disclosure, a battery cell includes an electrode plate assembly comprising a plurality of stacked electrode plates, the electrode plates comprising a positive electrode plate and a negative electrode plate; a tab assembly comprising a positive electrode tab and a negative electrode tab, the tab assembly comprising a positive electrode tab and a negative electrode tab, the positive electrode tab being electrically connected to the positive electrode plate and the negative electrode tab being electrically connected to the negative electrode plate; a current collector assembly comprising a positive electrode current collector and a negative electrode current collector, the positive electrode current collector being connected to the positive electrode tab and the negative electrode current collector being connected to the negative electrode tab; and a pole assembly comprising two poles, the pole assembly comprising two poles being a positive electrode pole connected to the positive electrode current collector and a negative electrode pole connected to the negative electrode current collector, respectively.

[0014] In this disclosure, a plurality of electrode plate assemblies are provided, each electrode plate assembly being provided with one tab assembly, one current collector assembly, and one pole column assembly.

[0015] In this disclosure, a plurality of pole assemblies, tab assemblies, and current collector assemblies are provided, and the plurality of pole assemblies are attached to a single electrode plate assembly.

[0016] A battery pack is further provided according to a second aspect of the present disclosure. The battery pack includes a battery cell which is any one of the above-described battery cells, and a heat transport member which can transport heat near a first surface of the battery cell to the outside of the housing corresponding to a second surface.

[0017] In this disclosure, the heat transport member is a heat conduction member, the heat conduction member is provided in a housing and is thermally conductively connected to a pole column, and the heat conduction member extends toward a position in the housing corresponding to a second surface.

[0018] In this disclosure, a plurality of battery cells are provided, and a heat conductive member is thermally connected to the pole columns of two adjacent battery cells.

[0019] In this disclosure, the battery pack further includes a heat sink, the heat sink having at least a portion of which is positioned facing a first surface and capable of exchanging heat with pole columns.

[0020] In this disclosure, the heat sink includes at least one tubular member, the tubular member having a first fluid channel through which a cooling fluid flows, and a portion of the tubular member forming at least a portion of a heat transport member.

[0021] In this disclosure, the battery pack further includes a cooling element that is thermally conductively connected to a housing corresponding to a second surface.

[0022] In this disclosure, the cooler has a second fluid channel through which a cooling fluid flows, and the cooler is thermally conductively connected to the heat transport member.

[0023] In this disclosure, two cooling elements are provided, and the battery cell is positioned between the two cooling elements.

[0024] According to a third aspect of this disclosure, a vehicle is provided that includes a battery pack according to any one of the embodiments described above.

[0025] According to an embodiment of the present disclosure, a battery cell mainly includes a housing, an electrode plate, a tab, a current collector, and a terminal post. The tab including a first section and a second section is a bending member, one part of the tab extends along a first direction of the electrode plate to increase the contact area with the electrode plate, and the other part extends along a second direction of the electrode plate to connect to the corresponding current collector. Specifically, the tab is bent to form the first section, whereby current is drawn from the side surface of the electrode plate, and the tab is bent to form the second section, whereby the tab is connected to the current collector. Thus, the current collector and the first section are provided in two directions of the electrode plate assembly to control the direction of current. In the battery cell of the present disclosure, by using a structure in which the tab is top-out and the terminal post is side-out, the current conduction path is shortened, the current capacity at the extraction position of the current collector of the battery cell is increased, and the rapid charging ability of the battery cell is improved.

[0026] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure when taken in conjunction with the drawings.

[0027] The accompanying drawings, which are incorporated herein and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

Brief Description of the Drawings

[0028] [Figure 1] FIG. 1 is a partial exploded view of a battery cell according to Embodiment 1 of the present disclosure. [Figure 2] FIG. 2 is a schematic diagram showing the internal structure of a battery cell according to Embodiment 1 of the present disclosure. [Figure 3] FIG. 3 is a schematic diagram showing the direction of current in a battery cell according to Embodiment 1 of the present disclosure. [Figure 4] FIG. 4 is a partial exploded view of a battery cell according to Embodiment 2 of the present disclosure. [Figure 5] FIG. 5 is a schematic diagram showing the internal structure of a battery cell according to Embodiment 2 of the present disclosure. [Figure 6] This is a partially exploded view of a battery cell according to Embodiment 2 of the present disclosure. [Figure 7] This is a schematic diagram showing the direction of current in a battery cell according to Embodiment 2 of the present disclosure. [Figure 8] This is a partially exploded view of a battery cell according to Embodiment 3 of the present disclosure. [Figure 9] This is a schematic diagram showing the internal structure of a battery cell according to Embodiment 3 of the present disclosure. [Figure 10] This is a schematic diagram showing the direction of current in a battery cell according to Embodiment 3 of the present disclosure. [Figure 11] This is a partially exploded view of a battery cell according to Embodiment 4 of the present disclosure. [Figure 12] This is a schematic diagram showing the internal structure of a battery cell according to Embodiment 4 of the present disclosure. [Figure 13] This is a schematic diagram showing the direction of current in a battery cell according to Embodiment 4 of the present disclosure. [Figure 14] This is a schematic diagram showing the assembly of a pole pole and a current collector according to one embodiment of the present disclosure. [Figure 15] This is a schematic diagram showing the assembly of a battery cell and a heat sink according to one embodiment of the present disclosure. [Figure 16] This is a partially exploded view of a battery pack according to one embodiment of the present disclosure. [Figure 17] This is a schematic diagram showing the assembly of a battery cell and an explosion-proof valve according to one embodiment of the present disclosure. [Figure 18] This is a schematic structural diagram of a connecting member according to one embodiment of the present disclosure, viewed from one perspective. [Figure 19] This is a schematic structural diagram of a connecting member according to one embodiment of the present disclosure, viewed from a different perspective. [Figure 20] This is a schematic diagram showing the attachment of a second heat conduction member to two battery cells according to one embodiment of the present disclosure. [Figure 21] This is an enlarged view of the enclosed area A in Figure 20. [Modes for carrying out the invention]

[0029] Next, various exemplary embodiments of this disclosure will be described in detail with reference to the accompanying drawings. Note that, unless otherwise specified, the relative arrangements, formulas, and numerical values ​​of the components and steps described in the embodiments are not intended to limit the scope of this disclosure.

[0030] The following description of at least one exemplary embodiment is illustrative and in no way constitutes any limitation of this disclosure, its use, or its application.

[0031] Techniques, methods, and apparatus known to those skilled in the art in the relevant technical field may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of this specification.

[0032] In all examples shown and discussed herein, any particular values ​​are merely illustrative and should not be construed as limiting. Therefore, other examples of the exemplary embodiments may have a variety of values.

[0033] It should be noted that similar reference numbers and letters indicate the same items in subsequent drawings. Therefore, if an item is defined in one drawing, it does not need to be discussed further in subsequent drawings.

[0034] A battery cell 2 according to one embodiment of the present disclosure will be described below with reference to the attached drawings.

[0035] As shown in Figures 1 to 21, a battery cell 2 according to one embodiment of the present disclosure includes a housing 21, an electrode plate 20, a tab 50, a current collector 222, and an electrode pole 33.

[0036] Specifically, a housing space is defined within the housing 21. An electrode plate 20 is placed within the housing space, and the electrode plate 20 has at least a first surface 2213 and a second surface 2212. A tab 50 is provided on the electrode plate 20, and the tab 50 includes a first section 532 and a second section 531 that are related to each other. The first section 532 extends from the first surface 2213 of the electrode plate 20, and a current collector 222 is provided on the first section 532, and the second section 531 extends from the second surface 2212 of the electrode plate 20 to transmit current between the second section 531 and the second surface 2212, and a pole is provided on the current collector 222 and extends from the housing 21.

[0037] In other words, the battery cell 2 according to the embodiment of the present disclosure mainly comprises a housing 2, electrode plates 20, tabs 50, a current collector 222, and poles 33. The housing 21 has a housing space. The housing space has a housing function and is configured to house and install the electrode plates 20 and the like.

[0038] The outer surface of the electrode plate 20 includes at least a first surface 2213 and a second surface 2212. A tab 50 is provided on the edge of the electrode plate 20. Specifically, the tab 50 includes a first section 532 and a second section 531 that are related to each other. The first section 532 is located on the first surface 2213 and extends from the first surface 2213 of the electrode plate 20. The second section 531 is located on the second surface 2212 and extends from the second surface 2212 of the electrode plate 20. The first section 532 is connected to the current collector 222 so that current can be transmitted between the second section 531 and the second surface 2212. It should be understood that the direction of current transmission is not limited here and may be from the second surface 2212 to the second section 531 or from the second section 531 to the second surface 2212. In addition, the current may flow from the second section 531 to the first section 532, or from the first section 532 to the second section 531, and this is not limited herein.

[0039] Accordingly, the battery cell 2 according to the embodiments of the present disclosure mainly comprises a housing 21, electrode plates 20, a tab 50, a current collector 222, and poles. The tab 50, including a second section 531 and a first section 532, is a bent member, with one portion of the tab 50 extending along a first direction of the electrode plates 20 to increase the contact area with the electrode plates 20, and the other portion extending along a second direction of the electrode plates 20 to connect to the corresponding current collector 222. Specifically, the tab 50 is bent to form the second section 531, thereby drawing current from the side of the electrode plates 20, and the tab 50 is bent to form the first section 532, thereby connecting the tab 50 to the current collector 222. In this way, the current collector 222 and the second section 531 are provided in two directions of the electrode plate assembly 221 to control the direction of the current. In the battery cell 2 of this disclosure, by using a structure in which the tab 50 is top-out and the pole column 33 is side-out, the current conduction path is shortened, the current capacity at the withdrawal position of the current collector 222 of the battery cell 2 is increased, and the rapid charging capability of the battery cell 2 is improved. The pole column 33 being side-out means that the pole column 33 is drawn out from the end of the electrode plate in a first direction, and the tab 50 being top-out means that one part of the tab 50 is provided at the end of the electrode plate 20 in a second direction.

[0040] Since one battery cell 2 can have multiple electrode plates 20, for simplicity of explanation, it should be understood that one battery cell 2 can be defined as having an electrode plate assembly 221, a tab assembly, a current collector assembly, and a pole assembly. The electrode plate assembly 221 includes multiple stacked electrode plates 20, which may include positive electrode plates and negative electrode plates. For example, the electrode plate assembly 221 includes multiple repeating structures of stacked positive electrode plate-separator-negative electrode plate. The tab assembly includes multiple tabs, which may be positive electrode tabs 51 or negative electrode tabs 52. For example, two tabs 50 are arranged, including a positive electrode tab 51 and a negative electrode tab 52. The positive electrode tab 51 is electrically connected to the positive electrode plate, and the negative electrode tab 52 is electrically connected to the negative electrode plate. The current collector assembly includes multiple current collectors 222, which include positive electrode current collectors and negative electrode current collectors. The positive electrode current collector is connected to the positive electrode tab 51, and the negative electrode current collector is connected to the negative electrode tab 52. The pole column assembly extends from the housing space and includes two pole columns 33. To achieve side-out of the pole columns 33, the two pole columns 33 are, respectively, a positive electrode pole column 31 connected to the positive electrode current collector and a negative electrode pole column 32 connected to the negative electrode current collector.

[0041] Optionally, at least one of the multiple tabs includes the related first section 532 and second section 531. That is, in a single tab assembly, in some cases only the positive electrode tab 51 includes the first section 532 and second section 531, or only the negative electrode tab 52 includes the first section 532 and second section 531, or both the positive electrode tab 51 and the negative electrode tab 52 include the first section 532 and second section 531, and this is not limited herein.

[0042] According to one embodiment of the present disclosure, at least one pole 33 is a sheet-like structure. The use of a sheet-like pole 33 not only increases the area of ​​the pole 33 but also increases the current-passing area of ​​the current collector 222, which promotes rapid charging.

[0043] Optionally, as shown in Figure 14, at least one pole pole 33 includes a first connection segment 331 and a second connection segment 332. The first connection segment 331 is configured to connect to the current collector 222, and the second connection segment 332 is configured to connect to the first connection segment 331 and to connect to an external electrical device. The first connection segment 331 and / or the second connection segment 332 are sheet-like structures.

[0044] In other words, the pole pole 33 mainly includes a first connecting segment 331 and a second connecting segment 332, the first connecting segment 331 and the second connecting segment 332 being connected, and the first connecting segment 331 may be configured to connect to a current collector 222, for example, a positive electrode current collector or a negative electrode current collector. It should be noted that the tab 50 of this disclosure may converge the positive electrode foil or the negative electrode foil, and the current collector 222 may be a structure formed after the tab 50 is welded, and the current collector 222 and the tab 50 may be two different states of the same material at this time. Whether the tab 50 and the current collector 222 are arranged separately or the tab 50 and the current collector 222 have a single structure, it should be understood that this is all within the scope of protection of this disclosure.

[0045] Specifically, the first end of the second connection segment 332 is connected to the first connection segment 331, and the second end of the second connection segment 332 is connected to an external electrical device. For example, the second connection segment 332 is positioned to the left of the first connection segment 331. The right end of the first connection segment 331 can be connected to a positive electrode current collector or a negative electrode current collector, the left end of the first connection segment 331 can be connected to the right end of the second connection segment 332, and the left end of the second connection segment 332 can be connected to an external electrical device.

[0046] It should be understood that at least one of the first connecting segment 331 and the second connecting segment 332 is a sheet-like structure. In other words, the pole column 33 includes, but is not limited to, the following cases: Case 1: only the first connecting segment 331 is a sheet-like structure; Case 2: only the second connecting segment 332 is a sheet-like structure; and Case 3: both the first connecting segment 331 and the second connecting segment 332 are sheet-like structures.

[0047] Conventional pole posts in related technologies are cylindrical in structure and are located at the ends of the battery core. The diameter of the cylindrical structure must be smaller than the thickness of the battery core. Since the surface area of ​​the cylindrical structure is related to its diameter, the surface area of ​​the cylindrical structure is small. In contrast, at least a portion of the pole post 33 in this embodiment has a sheet-like structure. The sheet-like structure has a thin thickness, and the dimensions of the sheet-like structure in multiple directions may differ from one another. For example, even if the thickness of the sheet-like structure is thinner than the thickness of the battery core, the sheet-like structure can increase the total area of ​​the pole post 33 by extending its dimensions in other directions. For example, if the thickness direction of the sheet-like structure is the front-to-back direction, the dimensions of the sheet-like structure in the length and width directions can be extended. If at least the first connecting segment 331 is a sheet-like structure, the area of ​​the pole post 33 is increased, and the current passage area of ​​the current collector 222 is increased. By increasing the area of ​​the pole column 33, the heat dissipation effect can be enhanced, and by increasing the current passage area, the degree of heat generation can be reduced, thereby solving the technical problem of limitations in the rapid charging capability of batteries in the case of conventional pole columns 33 in related technologies.

[0048] In this embodiment, the pole column 33 mainly comprises a first connecting segment 331 and a second connecting segment 332, the first connecting segment 331 and / or the second connecting segment 332 being sheet-like structures to increase area. When the first connecting segment 331 is a sheet-like structure, the current-passing area of ​​the current collector 222 can be further increased. By increasing the area of ​​the pole column 33, rapid heat dissipation of the pole column 33 is promoted, and by increasing the current-passing area, heat generation is reduced, thereby increasing the charging efficiency of the battery cell 2 and thus achieving rapid charging.

[0049] According to one embodiment of the present disclosure, at least one pole post 33 is an integrally molded member. That is, the pole post 33, manufactured by an integral molding process, such as stamping, includes both a first connecting segment 331 and a second connecting segment 332. In this embodiment, the use of an integrally molded pole post 33 facilitates processing and manufacturing, and the step of connecting the first connecting segment 331 and the second connecting segment 332 can be omitted.

[0050] In some specific embodiments of this disclosure, at least one pole post 33 is a rectangular member. That is, a first connecting segment 331 and a second connecting segment 332 can be combined to form a rectangular member which is a plate-shaped member. That is, the first connecting segment 331 and the second connecting segment 332 can extend along the same plane. For example, the first connecting segment 331 is located to the left of the second connecting segment 332, and the first connecting segment 331 and the second connecting segment 332 each extend horizontally and are located in the same horizontal plane. In this embodiment, using a pole post 33 having a rectangular structure facilitates the connection of the pole post 33 to the current collector 222 and external electrical equipment. For example, one side of the rectangular member is connected to the current collector 222 to ensure a large and sufficient current passage area. Furthermore, by using a rectangular member, both the area of ​​the pole post 33 and the current passage area of ​​the current collector 222 are increased, further improving the rapid charging capability of the battery cell 2.

[0051] Furthermore, as shown in Figure 14, if the pole column 33 is a rectangular member, the distance between the two sides of the pole column 33 in the thickness direction is uniform. For example, the pole column 33 extends horizontally. For multiple positions on the pole column 33, the distance between the top and bottom surfaces of the pole column 33 is the same. In this embodiment, processing efficiency can be increased by using a sheet-like pole column 33 having a uniform thickness.

[0052] In some specific embodiments of this disclosure, as shown in Figures 1 and 11, the electrode plate 20 has edges extending along a first direction, a second direction, and a third direction. The first and second directions define a first plane, the first and third directions define a second plane, and the second and third directions define a third plane. The first surface 2213 is connected to the second surface 2212, the first surface 2213 is parallel to the third plane, and the second surface 2212 is parallel to the second plane. Since the first section 532 extends from the first surface 2213 and the second section 531 extends from the second surface 2212, the first section 532 can be positioned at the end of the electrode plate assembly 221 in the first direction and isolated from the electrode plate assembly 221. The second section 531 is located at the end of the electrode plate assembly 221 in a second direction and can be electrically connected to the electrode plate 20.

[0053] As an example, the description is given of a positive electrode tab 51 including a second section 531 and a first section 532. The longitudinal direction of the electrode plate 20 is defined as the first direction, and the height direction of the electrode plate is defined as the second direction. The first direction extends horizontally, and the second direction extends vertically. To achieve top-out of the tab 50, the second section 531 is positioned above or below the electrode plate assembly 221, and the first section 532 is positioned to the left or right of the electrode plate assembly 221. The top-out structure of the tab 50 can also increase the current-passing area of ​​the tab 50. For example, the upper end of the positive electrode plate is connected to the second section 531, the left end of the second section 531 is connected to the upper end of the first section 532, and the lower end of the first section 532 is connected to the positive electrode current collector at the left end of the positive electrode plate.

[0054] Furthermore, the second section 531 and / or the first section 532 are sheet-like structures. The sheet-like structures have large and small surfaces, with the area of ​​the large surface being larger than the area of ​​the small surface. The use of sheet-like structures can facilitate the bending of the tabs 50 and the installation and arrangement of the tabs 50. The use of sheet-like structures also facilitates the presence of large, flat surfaces with a large area for connecting to multiple electrode plates 20.

[0055] If the pole column 33 is positioned at the end of the electrode plate assembly 221 in a first direction, it should be understood that the explosion-proof valve 1 can be designed to be positioned at the end of the electrode plate assembly 221 in a second direction or in a third direction, the third direction being different from the first and second directions. For example, any two of the first, second, and third directions are perpendicular to each other, the first direction extends in the left-right direction, the second direction extends in the up-down direction, and the third direction extends in the front-back direction. In this embodiment, by positioning the explosion-proof valve 1 at the end of the electrode plate assembly 221 in a second direction, more space is left for the sheet-like pole column 33 of the present disclosure, thereby further increasing the area of ​​the pole column 33. Furthermore, in order to enhance the thermal safety of the battery pack 1000, the size of the explosion-proof valve 1 can be increased, and the number of explosion-proof valves 1 can be increased, depending on the space in the second and third directions of the electrode plate assembly 221.

[0056] According to one embodiment of the present disclosure, the longitudinal direction of the pole column 33 extends along a second direction, and the width direction of the pole column 33 extends along a first direction. For example, the sheet-like pole column 33 extends approximately in the left-right direction, and the pole column assembly similarly extends approximately in the left-right direction, and the sheet-like pole column 33 and the pole column assembly generally have a parallel structure. In this embodiment, defining the extension direction of the pole column 33 facilitates the processing and assembly of the pole column 33 and promotes heat dissipation of the sheet-like pole column 33.

[0057] According to one embodiment of the present disclosure, as shown in Figures 1, 4, 8, and 11, the outer surface of the electrode plate 20 includes two third surfaces 2211, two second surfaces 2212, and two first surfaces 2213. The two third surfaces 2211 are spaced apart in a third direction. The longitudinal direction of each third surface 2211 extends along a first direction, and the height direction of each third surface 2211 extends along a second direction. The two second surfaces 2212 are spaced apart in a second direction. The two ends of each second surface 2212 in the third direction are each connected to the two third surfaces 2211. The two first surfaces 2213 are spaced apart in a first direction. The two ends of each first surface 2213 in the third direction are each connected to the two third surfaces 2211. Each of the two ends of the first surface 2213 in the second direction is connected to two second surfaces 2212. The first section 532 is provided on the first surface 2213, and the second section 531 is provided on the second surface 2212.

[0058] For example, the electrode plate 20 is a rectangular plate. The length direction of the electrode plate 20 is defined as the first direction, the height direction of the electrode plate 20 is defined as the second direction, and the thickness direction of the electrode plate 20 is defined as the third direction. The first direction can extend in the left-right direction, the second direction can extend in the up-down direction, and the third direction can extend in the front-back direction. Since the electrode plate assembly 221 is formed by stacking the electrode plates 20, the length direction, height direction, and thickness direction of the electrode plate 20 are also the length direction, height direction, and thickness direction of the electrode plate assembly 221. This will not be explained again here. The outer surface of the electrode plate 20 includes a third surface 2211, a second surface 2212, and a first surface 2213. There are two third surfaces 2211, two second surfaces 2212, and two first surfaces 2213. Specifically, the two third surfaces 2211 are separated in the front-to-back direction, the height of each third surface 2211 extends vertically, and the length of each third surface 2211 extends horizontally. The two second surfaces 2212 are separated vertically, one second surface 2212 is located above the third surface 2211, and the other second surface 2212 is located below the third surface 2211, with the front and rear ends of each second surface 2212 connected to the third surface 2211, respectively. The two first surfaces 2213 are separated horizontally, with the front and rear ends of each first surface 2213 connected to the two third surfaces 2211, respectively, and the upper and lower ends connected to the second surfaces 2212, respectively. In this case, the first section 532 is positioned on the first surface 2213, and the second section 531 is positioned on the second surface 2212. That is, the tab 50 is bent to form an L-shaped structure, the first section 532 is insulated from the electrode plate 20, and the second section 531 is electrically connected to the second surface 2212 of the electrode plate 20.

[0059] It should be understood that the second surface 2212 and the first surface 2213 corresponding to the electrode plate assembly 221 can be continuous or discontinuous. The second surface 2212 and the first surface 2213 can be clearly formed, in particular, depending on the specific arrangement of the positive electrode plate, negative electrode plate, and separator, as long as the positive electrode plate on the same side of the electrode plate assembly 221 can be electrically connected to the second section 531, or the negative electrode plate on the same side of the electrode plate assembly 221 can be electrically connected to the first section 532. In either case, it is within the scope of the concepts of this disclosure.

[0060] In this embodiment, by defining the shape of the electrode plate 20 and the shape of the electrode plate assembly 221, the bent tab 50 of the present disclosure can be applied to an existing electrode plate assembly 221, which can be seen to help draw current from the side.

[0061] According to one embodiment of the present disclosure, the length of the second section 531 is not longer than the length of the electrode plate assembly 221 in a first direction. For example, the first end of the second section 531 extends in a first direction, and the second end of the second section 531 is connected to the upper end of the first section 532, which extends in a second direction. In the first direction, the first end of the second section 531 may be flush with the end of the pole column assembly, or it may be shorter than the end of the pole column assembly. In other words, the lengths of the first section 532 and the second section 531 can be designed according to specific requirements, as long as the top-out structure of the tab 50 can be achieved. Any such design is included within the scope of the concepts of the present disclosure.

[0062] In some specific embodiments of this disclosure, the surface area of ​​the second surface 2212 is larger than the surface area of ​​the first surface 2213. For example, the dimensions of the electrode plate 20 in a first direction are larger than the dimensions of the electrode plate 20 in a second direction, the pole assembly is located at the end of the electrode plate assembly 221 in a first direction, the second section 531 extends along the first direction and is located at the end of the electrode plate assembly 221 in a second direction, and the first section 532 extends along the second direction and is located at the end of the electrode plate assembly 221 in a first direction. In other words, the electrode plate 20 has a length direction and a height direction. The length direction can be used as a first direction, and the height direction can be used as a second direction. In other words, the dimensions in the height direction are smaller than the dimensions in the length direction. If the first direction extends in the left-right direction and the second direction extends in the up-down direction, the pole column assembly can be positioned to the left or right of the electrode plate assembly 221, and accordingly, the first section 532 can also be positioned to the left or right of the electrode plate assembly 221, and the second section 531 can be positioned above or below the electrode plate assembly 221.

[0063] In this embodiment, the pole column assembly is provided on the first surface 2213 with a smaller area by providing the first section 532 on the second surface 2212 with a larger area by providing the second section 531 on the second surface 2212 with a larger area; accordingly, the pole column assembly is also provided on the first surface 2213. Such arrangement avoids the height constraints on the electrode plate assembly 221 caused by providing the pole column assembly on the end of the electrode plate assembly 221 extending in the second direction, thereby avoiding the reduction in battery capacity caused by the narrow size range of the electrode plate assembly 221 in the second direction. The second section 531 is connected to the end of the electrode plate assembly 221 extending in the first direction, which expands the connection area between the second section 531 and the electrode plate 20, and therefore expands the current extraction range. Furthermore, by positioning the second section 531 to correspond to the second surface 2212 with a larger area, the current passage area of ​​the tab 50 can be further increased while the tab 50 is top-out.

[0064] According to one embodiment of the present disclosure, as shown in Figures 1 to 3, the positive electrode pole 31 of the pole pole assembly is provided at one end of the electrode plate assembly 221 in a first direction, and the negative electrode pole 32 is provided at the other end of the electrode plate assembly 221 in a first direction. For example, the first direction of the electrode plate assembly 221 extends in the left-right direction. In this case, the positive electrode pole 31 of one pole pole assembly is located on the left side of the electrode plate assembly 221, and the negative electrode pole 32 of the pole pole assembly is located on the right side of the electrode plate assembly 221. In this embodiment, one electrode plate assembly 221 is arranged with one pole pole assembly, but it should be understood that this is not limited to this.

[0065] In some specific embodiments of the present disclosure, as shown in Figures 1 to 3, the second section 531 corresponding to the positive electrode pole 31 is located at one end of the electrode plate assembly 221 in a second direction, and the second section 531 corresponding to the negative electrode pole 32 is located at the other end of the electrode plate assembly 221 in a second direction. For example, if the positive electrode pole 31 of the pole assembly is provided at one end of the electrode plate assembly 221 in a first direction, and the negative electrode pole 32 is provided at the other end of the electrode plate assembly 221 in a first direction, then the second section 531 corresponding to the positive electrode pole 31 is located at one end of the electrode plate assembly 221 in a second direction, and the second section 531 corresponding to the negative electrode pole 32 is located at the other end of the electrode plate assembly 221 in a second direction. If the first direction is left-right and the second direction is up-down, the second section 531 corresponding to the positive electrode pole 31 of one pole column assembly may be positioned above the electrode plate assembly 221, and the second section 531 corresponding to the negative electrode pole 32 of the pole column assembly may be positioned below the electrode plate assembly 221.

[0066] According to one embodiment of the present disclosure, as shown in Figures 8 to 10, a second section 531 corresponding to a positive electrode pole 31 and a second section 531 corresponding to a negative electrode pole 32 are located at the same end of the electrode plate assembly 221 in a second direction and spaced apart in a first direction. For example, if the positive electrode pole 31 of the pole pole assembly is located at one end of the electrode plate assembly 221 in a first direction and the negative electrode pole 32 is located at the other end of the electrode plate assembly 221 in a first direction, then the second section 531 corresponding to the positive electrode pole 31 and the second section 531 corresponding to the negative electrode pole 32 are located at the same end of the electrode plate assembly 221 in a second direction. If the first direction is left-right and the second direction is up-down, then both the second section 531 corresponding to the positive electrode pole 31 and the second section 531 corresponding to the negative electrode pole 32 of one pole pole assembly can be located above or below the electrode plate assembly 221.

[0067] In some specific embodiments of this disclosure, as shown in Figure 11, the positive electrode pole 31 and the negative electrode pole 32 of an electrode pole assembly are located at the same end of the electrode plate assembly 221 in a first direction, the second section 531 corresponding to the positive electrode pole 31 is located at one end of the electrode plate assembly 221 in a second direction, and the second section 531 corresponding to the negative electrode pole 32 is located at the other end of the electrode plate assembly 221 in a second direction. In other words, the positive electrode pole 31 and the negative electrode pole 32 of one electrode pole assembly can be located at the same end of the electrode plate assembly 221 and at the same end of the electrode plate assembly 221 in a first direction. For example, the first direction extends in the left-right direction, and the second direction extends in the up-down direction. In this configuration, both the positive electrode pole 31 and the negative electrode pole 32 are positioned on the left or right side of the electrode plate assembly 221, the second section 531 corresponding to the positive electrode pole 31 can be positioned above the electrode plate assembly 221, and the second section 531 corresponding to the negative electrode pole 32 can be positioned below the electrode plate assembly 221.

[0068] According to one embodiment of the present disclosure, as shown in Figure 11, two electrode plate assemblies 221 are provided, and the two electrode plate assemblies 221 are arranged in a contiguous direction. Each electrode plate assembly 221 has at least one pole assembly, and a second section 531 corresponding to the positive electrode pole 31 and a second section 531 corresponding to the negative electrode pole 32 of each electrode plate assembly 221 are separated in a second direction. For example, the two electrode plate assemblies 221 are arranged in a left-right direction. The positive electrode pole 31 and negative electrode pole 32 of one pole assembly are provided on the left side of one electrode plate assembly 221, away from the other electrode plate assembly 221, and the positive electrode pole 31 and negative electrode pole 32 of the other pole assembly are provided on the right side of the other electrode plate assembly 221. The second section 531 corresponding to the positive electrode pole 31 on the left side of the electrode plate assembly 221 is positioned above the left side of the electrode plate assembly 221 and extends in the left-right direction. The second section 531 corresponding to the negative electrode pole 32 on the right side of the electrode plate assembly 221 is positioned below the right side of the electrode plate assembly 221 and extends in the left-right direction.

[0069] In some specific embodiments of this disclosure, as shown in Figure 4, one electrode plate assembly 221 is arranged with a plurality of pole assembly sets, each pole assembly corresponding to one current collector assembly and one tab assembly. It should be understood that in this embodiment, one or more electrode plate assemblies 221 may be arranged. For example, when one electrode plate assembly 221 is arranged, that one electrode plate assembly 221 may be arranged with a plurality of pole assembly sets. For example, accordingly, one electrode plate assembly 221 is arranged with two pole assembly sets. The positive electrode pole 31 of the two pole assembly sets is located to the left of the electrode plate assembly 221 and is separated vertically. The negative electrode pole 32 of the two pole assembly sets is located to the right of the electrode plate assembly 221 and is separated vertically. When two electrode plate assemblies 221 are arranged, the two electrode plate assemblies 221 can be arranged horizontally, and are the left electrode plate assembly and the right electrode plate assembly, respectively. The positive electrode pole 31 of the left electrode plate assembly is positioned above the negative electrode pole 32 of the left electrode plate assembly, and the positive electrode pole 31 of the right electrode plate assembly is positioned above the negative electrode pole 32 of the right electrode plate assembly.

[0070] According to one embodiment of the present disclosure, as shown in Figure 4, the positive electrode pole 31 of each pole pole assembly is located at one end of the electrode plate assembly 221 in a first direction, the negative electrode pole 32 of each pole pole assembly is located at the other end of the electrode plate assembly 221 in a first direction, a second section 531 corresponding to a plurality of positive electrode poles 31 is located at one end of the electrode plate assembly 221 in a second direction, and a second section 531 corresponding to a plurality of negative electrode poles 32 is located at the other end of the electrode plate assembly 221 in a second direction. In other words, when one electrode plate assembly 221 is arranged with a plurality of pole pole assemblies, the positive electrode pole 31 of each pole pole assembly is located at one end of the electrode plate assembly 221 in a first direction, and the negative electrode pole 32 of each pole pole assembly is located at the other end of the electrode plate assembly 221 in a first direction, thereby achieving two polarities on different sides. A second section 531 corresponding to a plurality of positive electrode poles 31 is located at one end of the pole assembly in a second direction, and a second section 531 corresponding to a plurality of negative electrode poles 32 is located at the other end of the electrode plate assembly 221 in a second direction. For example, if the first direction is left-right and the second direction is up-down, a plurality of pole assemblies are provided on one electrode plate assembly 221, with the positive electrode poles 31 of each pole assembly located on the left side of the pole assembly and the negative electrode poles 32 of each pole assembly located on the right side of the pole assembly. The second section 531 corresponding to the positive electrode poles 31 of each pole assembly is located on the upper side of the electrode plate assembly 221 and is arranged continuously in the thickness direction of the electrode plate assembly 221. The second section 531 corresponding to the negative electrode poles 32 of each pole assembly is located on the lower side of the electrode plate assembly 221 and is arranged continuously in the thickness direction of the electrode plate assembly 221.

[0071] In some specific embodiments of this disclosure, as shown in Figure 5, at the same end of the electrode plate assembly 221 in a second direction, one second section 531 is electrically connected to one portion of the electrode plate 20 and the other second section 531 is electrically connected to the other portion of the electrode plate 20. For example, the second direction is the vertical direction, and the thickness direction of the electrode plate assembly 221 is the third direction. At least two second sections 531 are arranged consecutively in the thickness direction. One second section 531 is electrically connected to one portion of the electrode plate 20 in the thickness direction, and the other second section 531 is electrically connected to the other portion of the electrode plate 20 in the thickness direction.

[0072] According to one embodiment of the present disclosure, as shown in Figure 6, at least two second sections 531 located at the same end of the electrode plate assembly 221 in a second direction have different lengths in the first direction. For example, the length of one second section 531 in the first direction is L1, and the length of the other second section 531 in the first direction is L2. <L2である。

[0073] In some specific embodiments of the present disclosure, two tabs 50 are arranged side-by-side or staggered in the thickness direction of the electrode plate assembly 221. For example, to achieve a side-by-side arrangement, the two second sections 531 are in the same column in the first direction, i.e., the same column in the thickness direction. Alternatively, to achieve a staggered arrangement in the thickness direction, the two second sections 531 are in different columns in the first direction, i.e., two columns in the thickness direction.

[0074] The battery cell 2 of this disclosure is described in detail below in relation to a specific embodiment.

[0075] Embodiment 1

[0076] As shown in Figures 1 to 3, one electrode plate assembly 221 is arranged. The electrode plate assembly 221 is an elongated member. The length direction of the electrode plate assembly 221 extends in the left-right direction, i.e., the left-right direction is defined as the first direction. The height direction of the electrode plate assembly 221 extends in the up-down direction, i.e., the up-down direction is defined as the second direction. The thickness direction of the electrode plate assembly 221 extends in the front-back direction, i.e., the front-back direction is defined as the third direction.

[0077] The pole pole assembly includes one positive electrode pole 31 and one negative electrode pole 32. The positive electrode pole 31 is positioned on the left side of the electrode plate assembly 221, and the negative electrode pole 32 is positioned on the right side of the electrode plate assembly 221. The positive electrode current collector is positioned on the left side of the electrode plate assembly 221, and the negative electrode current collector is positioned on the right side of the electrode plate assembly 221. The positive electrode current collector is connected to the positive electrode pole 31, and the negative electrode current collector is connected to the negative electrode pole 32.

[0078] The positive electrode tab 51, corresponding to the positive electrode pole 31, includes a second section 531 and a first section 532. The second section 531 of the positive electrode tab 51 is located below the electrode plate assembly 221 and extends in the left-right direction. The first section 532 of the positive electrode tab 51 is located to the left of the electrode plate assembly 221 and extends in the up-down direction.

[0079] The negative electrode tab 52, corresponding to the negative electrode pole 32, includes a second section 531 and a first section 532. The second section 531 of the negative electrode tab 52 is positioned above the electrode plate assembly 221 and extends in the left-right direction. The first section 532 of the negative electrode tab 52 is positioned to the right of the electrode plate assembly 221 and extends in the up-down direction.

[0080] In other words, the structural design used in Embodiment 1 is such that the top-out and bent single tabs are located on two different sides, and a single pole column 33 is located on each side. The current conduction path is shown in Figure 3.

[0081] Embodiment 2

[0082] As shown in Figures 4 to 7, one electrode plate assembly 221 is positioned. The electrode plate assembly 221 is an elongated member. The length direction of the electrode plate assembly 221 extends in the left-right direction, i.e., the left-right direction is defined as the first direction. The height direction of the electrode plate assembly 221 extends in the up-down direction, i.e., the up-down direction is defined as the second direction. The thickness direction of the electrode plate assembly 221 extends in the front-back direction, i.e., the front-back direction is defined as the third direction.

[0083] Two pole assemblies are arranged, including a first pole assembly and a second pole assembly. Each pole assembly includes one positive electrode pole 31 and one negative electrode pole 32. Each positive electrode pole 31 is positioned to the left of the electrode plate assembly 221, and each negative electrode pole 32 is positioned to the right of the electrode plate assembly 221. Each positive electrode current collector is positioned to the left of the electrode plate assembly 221, and each negative electrode current collector is positioned to the right of the electrode plate assembly 221. The positive electrode current collector is connected to the corresponding positive electrode pole 31, and the negative electrode current collector is connected to the corresponding negative electrode pole 32.

[0084] Each positive electrode tab 51 corresponding to a positive electrode pole 31 includes a second section 531 and a first section 532. The positive electrode pole 31 of the first pole assembly is positioned above the positive electrode pole 31 of the second pole assembly. The first section 532 corresponding to the positive electrode pole 31 of the first pole assembly is positioned to the left of the electrode plate assembly 221, and the second section 531 corresponding to the positive electrode pole 31 of the first pole assembly is positioned above the electrode plate assembly 221. The second section 531 corresponding to the positive electrode pole 31 of the first pole assembly is positioned behind the second section 531 corresponding to the positive electrode pole 31 of the second pole assembly. The first section 532 corresponding to the positive electrode pole 31 of the first pole assembly is connected to the upper part of one positive electrode current collector in the vertical direction, and the first section 532 corresponding to the positive electrode pole 31 of the second pole assembly is connected to the end of the other positive electrode current collector in the front-rear direction.

[0085] Each negative electrode tab 52 corresponding to a negative electrode pole 32 includes a second section 531 and a first section 532. The negative electrode pole 32 of the first pole assembly is positioned above the negative electrode pole 32 of the second pole assembly. The first section 532 corresponding to the negative electrode pole 32 of the first pole assembly is positioned to the right of the electrode plate assembly 221, and the second section 531 corresponding to the negative electrode pole 32 of the first pole assembly is positioned below the electrode plate assembly 221. The second section 531 corresponding to the negative electrode pole 32 of the first pole assembly is positioned in front of the second section 531 corresponding to the negative electrode pole 32 of the second pole assembly. The first section 532 corresponding to the negative electrode pole 32 of the first pole assembly is connected to the front-to-back end of one negative electrode current collector, and the first section 532 corresponding to the negative electrode pole 32 of the second pole assembly is connected to the bottom in the up-to-down direction of the other negative electrode current collector.

[0086] In other words, the structural design used in Embodiment 2 is such that multiple top-out and bent single tabs 50 are arranged on two different sides, and multiple pole posts 33 of the same polarity are arranged on each side. If the height of the battery cell 2 is large, the number of pole posts 33 can be adjusted according to the actual design size of the pole posts 33. The current conduction path is as shown in Figure 7.

[0087] Embodiment 3

[0088] As shown in Figures 11 to 13, two electrode plate assemblies 221 are arranged, which are the first electrode plate assembly 221 and the second electrode plate assembly 221, respectively. Each electrode plate assembly 221 is arranged with one electrode column assembly and one tab assembly. The first electrode plate assembly 221 and the second electrode plate assembly 221 extend in the left-right direction. The positive electrode column 31 and the negative electrode column 32 of the first electrode plate assembly 221 are located on the left side of the first electrode plate assembly 221, with the positive electrode column 31 positioned above the negative electrode column 32. Similarly, the positive electrode column 31 and the negative electrode column 32 of the second electrode plate assembly 221 are located on the right side of the second electrode plate assembly 221, with the positive electrode column 31 positioned above the negative electrode column 32.

[0089] Regarding the first electrode plate assembly 221, the lower end of the first section 532 corresponding to the positive electrode pole 31 is connected to the positive electrode current collector, and the first section 532 extends upward. The left end of the second section 531 is connected to the first section 532, and the second section 531 is positioned above the first electrode plate assembly 221 and extends to the right. The upper end of the first section 532 corresponding to the negative electrode pole 32 is connected to the negative electrode current collector, and the first section 532 extends downward. The left end of the second section 531 is connected to the lower end of the first section 532, and the second section 531 is positioned below the first electrode plate assembly 221 and extends to the right.

[0090] Regarding the second electrode plate assembly 221, the lower end of the first section 532 corresponding to the positive electrode pole 31 is connected to the positive electrode current collector, and the first section 532 extends upward. The right end of the second section 531 is connected to the upper end of the first section 532, and the second section 531 is positioned above the first electrode plate assembly 221 and extends to the left. The upper end of the first section 532 corresponding to the negative electrode pole 32 is connected to the negative electrode current collector, and the first section 532 extends downward. The right end of the second section 531 is connected to the lower end of the first section 532, and the second section 531 is positioned below the second electrode plate assembly 221 and extends to the left.

[0091] In other words, the structural design used in Embodiment 3 is such that the top-out and bent single tab 50 are arranged on two different sides, and multiple pole posts 33 of different polarities are arranged on each side. The current conduction path is as shown in Figure 10.

[0092] Embodiment 4

[0093] As shown in Figures 8 to 10, one electrode plate assembly 221 is positioned together with one electrode column assembly. The electrode column assembly includes a positive electrode column 31 and a negative electrode column 32. The positive electrode column 31 is positioned to the left of the electrode plate assembly 221, and the negative electrode column 32 is positioned to the right of the electrode plate assembly 221.

[0094] The positive electrode tab 51, corresponding to the positive electrode pole 31, includes a second section 531 and a first section 532. Similarly, the negative electrode tab 52, corresponding to the negative electrode pole 32, also includes a second section 531 and a first section 532.

[0095] The first section 532 corresponding to the positive electrode pole 31 is located on the left side of the electrode plate assembly 221, and the first section 532 corresponding to the negative electrode pole 32 is located on the right side of the electrode plate assembly 221. The second section 531 corresponding to the positive electrode pole 31 is located above the electrode plate assembly 221 and extends to the right. Similarly, the second section 531 corresponding to the negative electrode pole 32 is located above the electrode plate assembly 221 and extends to the right. The right end of the second section 531 corresponding to the positive electrode pole 31 is separated from the left end of the second section 531 corresponding to the negative electrode pole 32.

[0096] In other words, Embodiment 4 uses a structure in which the top-out and the bent single tab 50 are located on the same side, and a single pole column 33 is located on each side. The current conduction path is as shown in Figure 13.

[0097] This disclosure also provides a battery pack 1000, which includes a battery cell 2 and a heat transport member 40. The battery cell 2 is a battery cell 2 according to any one of the embodiments described above. The heat transport member 40 can transport heat from near the first surface 2213 of the battery cell 2 to the outside of the housing 21 corresponding to the second surface 2212. In other words, by using the heat transport member 40, the heat of the battery cell 2 can be transported to the outside in a timely manner, thereby increasing heat dissipation efficiency and promoting rapid charging.

[0098] According to one embodiment of the present disclosure, the battery pack 1000 further includes a tray. A holding space is defined within the tray, a battery cell 2 is positioned within the holding space, a heat transport member 40 is positioned within the holding space, and the heat transport member 40 is thermally conductively connected to the battery cell 2.

[0099] According to one embodiment of the present disclosure, the heat transport member 40 includes a heat conduction member 401, which is a first heat conduction member 43. The first heat conduction member 43 can transport heat from near the second surface 2212 to the outside, thereby cooling the structure near the second surface 2212.

[0100] In some specific embodiments of the present disclosure, the heat transport member 40 includes a heat conduction member 401, wherein the heat conduction member 401 is a second heat conduction member 44. The second heat conduction member 44 is provided in the housing 21 and is thermally conductively connected to the pole column 33, and the second heat conduction member 44 extends toward a position in the housing 21 corresponding to a second surface 2212. By arranging the second heat conduction member 44, heat near the pole column 33 can be transported outward to promote rapid charging by increasing the cooling effect and cooling rate.

[0101] According to one embodiment of the present disclosure, a plurality of battery cells 2 are provided, and a second heat conduction member 44 is thermally connected to the poles of two adjacent battery cells 2. For example, a plurality of battery cells 2 are arranged in a third direction, and the second heat conduction member 44 is thermally connected to the poles 33 of two adjacent battery cells 2 in the third direction. In other words, a plurality of battery cells 2 are provided, and the plurality of battery cells 2 are arranged in a third direction, and the third direction can be the thickness direction of the battery cell 2. The second heat conduction member 44 is thermally connected to the poles 33 of two adjacent battery cells 2 in the third direction.

[0102] For example, two battery cells 2 are provided in a third direction, which are a first battery cell and a second battery cell, respectively. The first battery cell has a first pole assembly, and the second battery cell has a second pole assembly. One pole 33 of the first pole assembly is positioned to the left of the first battery cell, and similarly, one pole 33 of the second pole assembly is positioned to the left of the second battery cell. Because the first and second battery cells are arranged consecutively in the third direction, at least one pole 33 of the first battery cell and at least one pole 33 of the second battery cell are positioned adjacent to each other in the third direction with a gap between them. A second heat conduction member 44 is provided in this gap, and heat can be transported from the poles 33 of the two battery cells 2 by one of the second heat conduction members 44. Optionally, in the second direction, the length of the second heat conduction member 44 may be equal to or longer than the length of the pole column 33. If the lengths are equal, the heat dissipation effect of the pole column 33 can be guaranteed, and if the length is equal to the length of the pole column 33, heat can be transported over a wider area from the pole column 33.

[0103] Furthermore, the second heat conduction member 44 makes area contact with the pole column 33 to enhance the heat transfer effect. For example, the pole column 33 has a sheet-like structure to promote area contact.

[0104] In some specific embodiments of the present disclosure, the battery pack 1000 further includes a heat sink 45. At least a portion of the heat sink 45 is positioned facing the first surface 2213 and is capable of exchanging heat with the pole column 33.

[0105] For example, the heat transport member 40 includes a heat sink 45, which is positioned outside the pole column 33, away from the electrode plate assembly 221 in a first direction, and is thermally conductively connected to the pole column 33. In other words, the heat transport member 40 includes a heat sink 45, which is positioned on the side of the pole column 33, away from the electrode plate assembly 221 in a first direction, and is thermally conductively connected to the pole column 33. That is, the heat sink 45 is designed to be outside the pole column 33 in order to reduce the temperature rise of the pole column 33.

[0106] According to one embodiment of the present disclosure, the heat sink 45 includes at least one tubular member, the tubular member having a first fluid channel through which a cooling fluid flows, and a portion of the tubular member forms at least a portion of a heat transport member 40 to enhance heat dissipation efficiency through heat exchange.

[0107] In some specific embodiments of the present disclosure, the battery pack 1000 further includes a cooler 402 which is thermally conductively connected to the housing 21 corresponding to the second surface 2212. In this embodiment, the placement of the cooler 402 enhances the heat dissipation efficiency and effect of heat near the second surface 2212.

[0108] In some specific embodiments of this disclosure, the first heat conduction member 43 is thermally connected to the battery cell 2 and the cooler 402, respectively. That is, heat exchange between the battery cell 2 and the cooler 402 can be achieved by the first heat conduction member 43. In this embodiment, by arranging the first heat conduction member 43, damage to the battery cell 2 due to direct contact between the battery cell 2 and the cooler 402 is avoided, and an overly large design of the cooler 402 is also avoided. When multiple battery cells 2 are arranged, one first heat conduction member 43 can accommodate multiple battery cells 2.

[0109] According to one embodiment of the present disclosure, the cooling body 402 and the first heat conduction member 43 are each sheet-like structures, and the first heat conduction member 43 is in contact with the cooling body 402 and the battery cell 2, respectively. For example, the upper end surface of the first heat conduction member 43 is in contact with the lower end surface of the cooling body 402, and the lower end surface of the first heat conduction member 43 is in contact with the upper end surface of the battery cell 2, thereby increasing the heat conduction area through surface contact, improving stress balance and heat dissipation uniformity at multiple positions in the battery cell 2, and improving stress balance and heat dissipation uniformity of multiple battery cells 2 when multiple battery cells 2 are arranged.

[0110] According to one embodiment of the present disclosure, the holding space has at least one open end in the axial direction. The cooling body 402 acts as a lower or upper plate of the tray to enhance space utilization and structural compactness.

[0111] According to one embodiment of the present disclosure, the cooler 402 has a second fluid channel through which a cooling fluid flows, and the cooler 402 is thermally conductively connected to the heat transport member 40.

[0112] In some specific embodiments of this disclosure, the cooler 402 has a second fluid channel inside, and the heat sink 45 has a first fluid channel inside, the first fluid channel communicating with the second fluid channel. In this case, the cooler 402 can be used as a liquid cooler plate. By supplying fluid into the heat sink 45, the heat dissipation effect near the pole column 33 can be enhanced.

[0113] According to one embodiment of the present disclosure, two coolers 402 are provided, and a battery cell 2 is positioned between the coolers 402. That is, the heat transport member 40 includes two coolers 402. For simplicity of explanation, the two coolers are a first cooler 41 and a second cooler 42, respectively. The first cooler 41 may be positioned above the battery cell 2, and the second cooler 42 may be positioned below the battery cell 2. For example, the electrode plate 20 has a first direction and a second direction. The dimensions of the electrode plate 20 in the first direction are greater than the dimensions in the second direction. The first cooler 41 is positioned at one end of the battery cell 2 in the second direction, and the second cooler 42 is positioned at the other end of the battery cell 2 in the second direction.

[0114] The first cooler 41 can conduct heat from the top of the battery cell 2, and the second cooler 42 can conduct heat from the bottom of the battery cell 2. In this embodiment, the cooperation of the first cooler 41 and the second cooler 42 forms a sandwich-like cooling structure for cooling the battery cell 2 on both sides in order to reduce the temperature difference between the two sides of the battery cell 2, for example, the temperature difference in the height direction. By arranging the first cooler 41 and the second cooler 42 on both sides of the battery cell 2, heat dissipation in this direction is achieved. By combining the pole columns 33 in the first and second directions, heat dissipation in the first direction is achieved, thus achieving multi-directional heat dissipation of the battery cell 2. Furthermore, the sheet-like pole columns 33 enhance the heat dissipation effect.

[0115] Furthermore, in order to enhance the heat dissipation effect and to avoid excessive space occupancy in the height direction due to the presence of the tray, bottom plate, first cooling body 41, and second cooling body 42 in the height direction, the first cooling body 41 can be used as the top plate of the tray, and the second cooling body 42 can be used as the bottom plate of the tray.

[0116] If the tab 50 has a sheet-like structure, the larger surface of the tab 50 may be positioned facing the cooling body 402 in order to increase the heat dissipation rate of the tab 50.

[0117] It should be understood that the cooler 402 can be positioned on the side of the explosion-proof valve 1, away from the electrode plate assembly 221. For example, the cooler 402 can be positioned above the explosion-proof valve 1. Optionally, a relief structure can be placed on the cooler 402 to avoid preventing the explosion-proof valve 1 from opening. The gas discharge direction 11 of the explosion-proof valve 1 is shown in Figure 17, and the gas discharge direction proceeds upward and then spreads outward.

[0118] In some specific embodiments of the present disclosure, the battery pack 1000 further includes a connecting member 46. At least a portion of the connecting member 46 is positioned between the heat sink 45 and the pole post 33 and is thermally conductively connected to the heat sink 45 and the pole post 33, respectively. By positioning the connecting member 46, the problems of difficult mounting and low rigidity of the heat sink and the pole post 33 are solved. When the pole post 33 is connected to the heat sink 45 by the connecting member 46, the heat sink 45 can be positioned outside the connecting member 46 and the pole post 33 can be positioned inside the connector 46.

[0119] According to one embodiment of the present disclosure, as shown in Figures 16 and 18, the connecting member 46 includes a first connecting portion 461, a second connecting portion 462, and a third connecting portion 463. The first connecting portion 461 is connected to one pole 33 of two adjacent battery cells 2 in a third direction, the second connecting portion 462 is connected to the other pole 33 of two adjacent battery cells 2 in a third direction, and the third connecting portion 463 is connected to the first connecting portion 461 and the second connecting portion 462, respectively. These connecting portions fit together to form a housing groove configured to accommodate a second heat conduction member 44. For example, the third direction is the front-rear direction. The first connecting portion 461 and the second connecting portion 462 are spaced apart in the front-rear direction, and the third connecting portion 463 may be located between the first connecting portion 461 and the second connecting portion 462. The rear end of the third connector 463 is connected to the first connector 461, and the front end of the third connector 463 is connected to the second connector 462. The second heat conduction member 44 is positioned between the first connector 461 and the second connector 462 and is thermally conductively connected to the first connector 461, the second connector 462, and the third connector 463, respectively. Furthermore, the third connector 463 is thermally conductively connected to the heat sink 45. In this disclosure, a thermal conduction connection means that heat conduction can occur between two members, including direct connection, indirect connection, spaced arrangement, and other positional relationships.

[0120] According to one embodiment of the present disclosure, as shown in Figures 18 and 19, the connecting member 46 further includes a fourth connecting portion 464. The fourth connecting portion 464 is located on the same side of the third connecting portion 463 together with the first connecting portion 461 and the second connecting portion 462. The fourth connecting portion 464 is located at at least one end of the third connecting portion 463 in a second direction. The fourth connecting portion 464 serves to restrict the second heat conduction member 44. Optionally, two fourth connecting portions 464 are arranged, with one fourth connecting portion 464 located at the upper end of the third connecting portion 463 and the other fourth connecting portion 464 located at the lower end of the third connecting portion 463. It can be seen that the first connection part 461, the second connection part 462, the third connection part 463, and the fourth connection part 464 allow heat to be conducted in multiple directions from around the second heat conduction member 44, enabling timely and efficient transport of heat to the heat sink 45. For example, the second heat conduction member 44 is thermally conductively connected to the cooler 402 by the fourth connection part 464.

[0121] Furthermore, the second heat conductive member 44 is also thermally conductively connected to the current collector 222 corresponding to the pole pole 33 in order to enhance the heat dissipation effect of the current collector 222.

[0122] According to one embodiment of the present disclosure, the housing 21 may include side plates 211 and cover plates 212, which fit together to form a housing space. A pole column 33 extends from the housing space via the cover plate 212. The cover plate 212 may be selected from, but is not limited to, an aluminum cover plate 212 (having a thickness in the range of 0.5 to 3.5 mm) or a steel cover plate 212 (having a thickness in the range of 0.2 to 2 mm). The side plates 211 may be selected from, but is not limited to, an aluminum plate (having a thickness in the range of 0.3 to 2 mm) or a steel plate (having a thickness in the range of 0.1 to 1 mm).

[0123] The maximum length of the pole column 33 is defined as L1, the length of the cover plate 212 is defined as L2, the gap between the pole column 33 and the cover plate 212 is defined as L3, the gap between two adjacent pole columns 33 is defined as L4, and the number of pole columns 33 is defined as N. These parameters are given by the following equation, namely, L1 = (L2 - L3 * The condition satisfies 2-(N-1)L4) / N.

[0124] Optionally, at least one end of the connecting member 46 is thermally conductively connected to the cooler 402 in a second direction. The second heat conduction member 44 can be made from a highly thermally conductive material. When the second heat conduction member 44 is positioned between the cover plate 212 and the connecting member 46, the third connection 463 can conduct heat upward or downward along the cover plate 212 to the cooler 402, thereby increasing heat dissipation. Heat from the poles 33 and current collectors 222 can be carried away by the connecting member 46 overall, improving the rapid charging capability. Specific heat dissipation paths may include, but are not limited to, the following paths.

[0125] Heat dissipation path 1: Bent tab → pole column 33 → connecting member 46 → first heat conduction member 43 → cooling elements on both sides; Heat dissipation path 2: Bent tab → pole column 33 → connecting member 46 → heat sink 45; Heat dissipation path 3: Bent tab → Cover plate 212 → Second heat conduction member 44 → Connecting member 46 → First heat conduction member 43 → Cooling elements on both sides; Heat dissipation path 4: Bent tab → Cover plate 212 → Second heat conduction member 44 → Connecting member 46 → Heat sink 45; Heat dissipation path 5: Top-out tab → Housing 21 → First heat conduction member 43 → Cooling elements on both sides.

[0126] According to one embodiment of the present disclosure, the connecting member 46 is welded together with the pole post 33. Welding can increase connection reliability. Furthermore, the sides of the pole post 33 are in surface contact with the connecting member 46. For example, to increase the welding area between the pole post 33 and the connecting member 46, the length of the pole post 33 extends vertically and the width extends horizontally, so that the sides of the pole post 33 in the thickness direction of the electrode plate assembly 221 are in contact with the sides of the connecting member 46. Optionally, to increase assembly efficiency, the connecting member 46 is coupled to a heat sink 45.

[0127] In summary, according to the pole posts 33, battery cells 2, and battery pack 1000 provided in embodiments of the present disclosure, one or more tabs 50 that can be flexibly positioned on the same or different sides of the battery cell 2 can be designed on the battery cell 2. Furthermore, in order to improve the high-rate fast-charging capability, a new structure of pole posts 33 and a design of heat transport members 40 with high heat dissipation paths can be employed. Unlike conventional battery cores that have positive and negative pole posts 33 on two sides, the heat dissipation area of ​​the current collector 222 is increased in the present disclosure to increase the current passage capacity of the electrode plate assembly 221. By combining a high heat dissipation design such as a cooler 204 positioned on two sides, heat is carried away from the pole posts 33 by a connecting member 46 that mates with the heat sink 45, and by a second heat conduction member 44 added between the connecting member 46 and the cover plate 212, thereby improving the overall fast-charging capability of the power battery.

[0128] The Disclosure further provides a vehicle comprising a battery pack 1000 according to any of the embodiments described above. Since the battery pack 1000 has excellent heat dissipation and therefore improved fast charging capability, the vehicle of the Disclosure also has the advantage of high fast charging capability, which is not described again here.

[0129] While several specific embodiments of this disclosure have been described in detail as examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims. [Explanation of Symbols]

[0130] 1000 Battery Pack 1. Explosion-proof valve 11 Gas discharge direction 2 battery cells 21 Housing 211 Side panel 212 Cover plate 20 Electrode plate 221 Electrode Plate Assembly 2211 Third side 2212 Second side 2213 First side 222 Current collector 31 Positive electrode pole 32 Negative electrode pole 33 Pole Pillar 331 First connection segment 332 Second connection segment 40 Heat transport member 401 Heat Conducting Material 402 Cooling element 41 First Cooler 42 Second Cooler 43 First heat conduction member 44 Second heat conduction member 45 Heat sink 46 Connecting Member 461 First connection part 462 Second connection section 463 Third connection section 464 Fourth connection section 50 tabs 51 Positive electrode tab 52 Negative electrode tab 532 Section 1 531 Section 2

Claims

1. A battery cell (2) and Heat transport member (40), Heat sink (44) and Cooling element (402), Equipped with, The aforementioned battery cell (2) is A housing (21) in which the storage space is defined, Displaced within the aforementioned housing space, the electrode plate (20) has at least a first surface and a second surface, A tab (50) and a current collector (222), wherein the tab (50) is provided on the electrode plate (20), and the tab (50) comprises a first section (532) and a second section (531) connected to each other, the first section (532) extending from the first surface of the electrode plate (20), the current collector (222) is provided on the first section (532), and the second section (531) extends from the second surface of the electrode plate (20) to transmit current between the second section (531) and the second surface, A pole pole (33) is provided on the current collector (222) and extends from the housing (21), Equipped with, The electrode plate (20) is a rectangular plate, The electrode plate (20) has edges extending along a first direction which is the length direction of the electrode plate (20), a second direction which is the height direction of the electrode plate (20), and a third direction which is the thickness direction of the electrode plate (20), wherein the first and second directions define a first plane, the first and third directions define a second plane, and the second and third directions define a third plane. The first surface is parallel to the third plane, and the second surface is parallel to the second plane. The heat transport member (40) transports heat from near the first surface of the battery cell (2) to the outside of the housing (21) corresponding to the second surface. At least a portion of the heat sink (44) is positioned facing the first surface, and the heat sink (44) exchanges heat with the pole column (33), The heat sink (44) comprises at least one tubular member, the tubular member having a first fluid channel through which a cooling fluid flows, and a portion of the tubular member forms at least a portion of the heat transport member (40). The cooling body (402) is in contact with the housing (21) corresponding to the second surface, The cooling body (402) has a second fluid channel through which a cooling fluid flows, and the cooling body (402) is in contact with the heat transport member (40). The first fluid channel communicates with the second fluid channel, and the battery pack (1000) is connected to it.

2. The battery pack (1000) according to claim 1, wherein at least one pole (33) is a sheet-like structure.

3. The battery pack (1000) according to claim 1 or 2, wherein the first surface and the second surface are connected.

4. The battery pack (1000) according to claim 3, wherein the surface area of ​​the second surface is larger than the surface area of ​​the first surface.

5. The battery pack (1000) according to claim 3, wherein the electrode column (33) comprises a positive electrode column (31) and a negative electrode column (32), the second section (531) corresponding to the positive electrode column (31) is located at one end of the electrode plate (20) in the second direction, and the second section (531) corresponding to the negative electrode column (32) is located at the other end of the electrode plate (20) in the second direction.

6. The battery pack (1000) according to claim 3, wherein the electrode column (33) comprises a positive electrode column (31) and a negative electrode column (32), and the second section (531) corresponding to the positive electrode column (31) and the second section (531) corresponding to the negative electrode column (32) are located at the same end of the electrode plate (20) in the second direction and spaced apart in the first direction.

7. The battery pack (1000) according to claim 5, wherein the positive electrode pole (31) and the negative electrode pole (32) are positioned at the same end of the electrode plate (20) in the first direction.

8. The battery pack (1000) according to claim 5, wherein the positive electrode pole (31) is positioned at one end of the electrode plate (20) in the first direction, and the negative electrode pole (32) is positioned at the other end of the electrode plate (20) in the first direction.

9. The battery cell (2) is An electrode plate assembly (221) comprising a plurality of stacked electrode plates (20), wherein the electrode plate assembly (221) comprises a positive electrode plate and a negative electrode plate, A tab assembly comprising a positive electrode tab (51) and a negative electrode tab (52), wherein the positive electrode tab (51) is electrically connected to the positive electrode plate, and the negative electrode tab (52) is electrically connected to the negative electrode plate, A current collector assembly comprising a positive electrode current collector and a negative electrode current collector, wherein the positive electrode current collector is connected to the positive electrode tab (51) and the negative electrode current collector is connected to the negative electrode tab (52), and the current collector assembly comprises a positive electrode current collector and a negative electrode current collector, A pole pole assembly comprising two pole poles (33), wherein the two pole poles (33) are a positive electrode pole pole (31) connected to the positive electrode current collector and a negative electrode pole pole (32) connected to the negative electrode current collector, The battery pack (1000) according to claim 5, comprising the above.

10. The battery pack (1000) according to claim 9, wherein a plurality of electrode plate assemblies (221) are arranged, and each of the electrode plate assemblies (211) is arranged together with a tab assembly, a current collector assembly, and a pole column assembly.

11. The battery pack (1000) according to claim 9, comprising a plurality of pole assemblies, a plurality of tab assemblies, and a plurality of current collector assemblies, wherein the plurality of pole assemblies are attached to a single electrode plate assembly (221).

12. The heat transport member (40) is The battery pack (1000) according to claim 1 or 2, comprising a heat conductive member (401), the heat conductive member (401) being provided on the housing (21), in contact with the pole column (33), and the heat conductive member (401) extending toward a position in the housing (21) corresponding to the second surface.

13. The battery pack (1000) according to claim 12, wherein a plurality of battery cells (2) are provided, and the heat conductive member (401) is in contact with the pole columns (33) of two adjacent battery cells (2).

14. A battery pack (1000) according to claim 1 or 2, wherein two cooling bodies (402) are provided, and the battery cell (2) is positioned between the cooling bodies (402).

15. A vehicle comprising the battery pack (1000) according to claim 1 or 2.

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