Single cell battery, 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 based on and claims priority to Chinese Patent Application No. 202211003310.X, filed on Friday, August 19, 2022, the entire disclosure of which is incorporated herein by reference.

[0002] The present 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 technology]

[0003] The tabs of batteries in the related art are conventional tabs, which are attached to the widthwise ends of the electrode plates. The length of the lengthwise ends of the tabs is shorter than the widthwise ends of the tabs, which limits the area. As a result, the current-passing area and electrode pillar of the tabs are small, which limits the fast charging capability of the battery. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to provide a battery cell to solve the technical problem of limited fast charging capability of batteries with conventional tabs in the related art. [Means for solving the problem]

[0005] According to a first aspect of the present disclosure, there is provided a battery cell including: a housing defining a storage space therein; an electrode plate disposed in the storage space and having at least a first surface and a second surface; a tab and a current collector, the tab being provided on the electrode plate and including a first section and a second section associated with each other, the first section extending from the first surface of the electrode plate; the current collector being provided on the first section; and the second section extending from the second surface of the electrode plate, for transmitting current between the second section and the second surface; and a pole provided on the current collector and extending from the housing.

[0006] In the present disclosure, at least one pole post is a sheet-like structure.

[0007] In the present disclosure, the electrode plate has edges extending along a first direction, a second direction, and a third direction. The first direction and the second direction define a first plane, the first direction and the third direction define a second plane, and the second direction and the third direction define a third plane. The first and second faces are connected, and the first face is parallel to the third plane and the second face is parallel to the second plane.

[0008] In the present disclosure, the surface area of the second surface is greater than the surface area of the first surface.

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

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

[0011] In the present disclosure, the positive electrode post and the negative electrode post are positioned at the same end in a first direction of the electrode plate.

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

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

[0014] In the present disclosure, a plurality of electrode plate assemblies are provided, each of which is provided with one tab assembly, one current collector assembly, and one electrode post assembly.

[0015] In the present disclosure, a plurality of electrode post assemblies, tab assemblies, and current collector assemblies are provided, and the plurality of electrode post assemblies are attached to one electrode plate assembly.

[0016] According to a second aspect of the present disclosure, there is further provided a battery pack including a battery cell, which is any one of the battery cells described above, and a heat transfer member capable of transferring heat near a first surface of the battery cell to an outside of the housing corresponding to a second surface.

[0017] In the present disclosure, the heat transfer member includes a thermally conductive member that is provided in the housing and thermally conductively connected to the pole, and that extends toward a position in the housing that corresponds to the second surface.

[0018] In the present disclosure, a plurality of battery cells are provided, and thermally conductive members are thermally connected to the poles of two adjacent battery cells.

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

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

[0021] In the present disclosure, the battery pack further includes a cooling body thermally conductively connected to the housing corresponding to the second surface.

[0022] In the present disclosure, the cooling body has a second fluid channel therein through which a cooling fluid flows, and the cooling body is thermally conductively connected to the heat transfer member.

[0023] In the present disclosure, two cooling bodies are provided, and the battery cells are positioned between the two cooling bodies.

[0024] According to a third aspect of the present disclosure, there is provided a vehicle including a battery pack according to any one of the above embodiments.

[0025] According to one embodiment of the present disclosure, a battery cell mainly includes a housing, an electrode plate, a tab, a current collector, and a pole. The tab, which includes a first section and a second section, is a bent member, with one portion of the tab extending along a first direction of the electrode plate to increase the contact area with the electrode plate, and the other portion extending along a second direction of the electrode plate to connect to the corresponding current collector. In particular, the tab is bent to form the first section, which allows current to be drawn from the side of the electrode plate, and the tab is bent to form the second section, which connects the tab to the current collector. In this way, 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 top-out tab and side-out pole structure, the current conduction path is shortened, the current capacity at the current collector drawing position of the battery cell is increased, and the fast charging capability of the battery cell is improved.

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

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, explain the principles of the disclosure. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 2 is a partially exploded view of a battery cell according to the first embodiment of the present disclosure. [Figure 2] 1 is a schematic diagram illustrating the internal structure of a battery cell according to a first embodiment of the present disclosure. [Figure 3] FIG. 2 is a schematic diagram showing the direction of current in a battery cell according to the first embodiment of the present disclosure. [Figure 4] FIG. 10 is a partially exploded view of a battery cell according to a second embodiment of the present disclosure. [Figure 5] FIG. 10 is a schematic diagram showing the internal structure of a battery cell according to a second embodiment of the present disclosure. [Figure 6] FIG. 10 is a partially exploded view of a battery cell according to a second embodiment of the present disclosure. [Figure 7] FIG. 10 is a schematic diagram showing the direction of current in a battery cell according to a second embodiment of the present disclosure. [Figure 8] FIG. 10 is a partially exploded view of a battery cell according to a third embodiment of the present disclosure. [Figure 9] FIG. 10 is a schematic diagram showing the internal structure of a battery cell according to a third embodiment of the present disclosure. [Figure 10] FIG. 10 is a schematic diagram showing the direction of current in a battery cell according to a third embodiment of the present disclosure. [Figure 11] FIG. 10 is a partially exploded view of a battery cell according to a fourth embodiment of the present disclosure. [Figure 12] FIG. 10 is a schematic diagram showing the internal structure of a battery cell according to a fourth embodiment of the present disclosure. [Figure 13] FIG. 10 is a schematic diagram showing the direction of current in a battery cell according to a fourth embodiment of the present disclosure. [Figure 14] FIG. 2 is a schematic diagram illustrating the assembly of a pole and a current collector according to an embodiment of the present disclosure. [Figure 15] FIG. 1 is a schematic diagram illustrating an assembly of a battery cell and a heat sink according to one embodiment of the present disclosure. [Figure 16] FIG. 2 is a partially exploded view of a battery pack according to one embodiment of the present disclosure. [Figure 17] FIG. 1 is a schematic diagram illustrating an assembly of a battery cell and an explosion-proof valve according to one embodiment of the present disclosure. [Figure 18] 1 is a schematic structural diagram of a connecting member according to an embodiment of the present disclosure, viewed from one perspective; [Figure 19] FIG. 10 is a schematic structural diagram of a connecting member according to an embodiment of the present disclosure, viewed from another perspective. [Figure 20] FIG. 10 is a schematic diagram illustrating the attachment of a second thermal conduction member to two battery cells according to one embodiment of the present disclosure. [Figure 21] FIG. 21 is an enlarged view of the enclosed area A in FIG. 20. DETAILED DESCRIPTION OF THE INVENTION

[0029] Next, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specified, the relative positions, formulas, and numerical values of the components and steps described in the embodiments do not limit the scope of the present disclosure.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is not intended to constitute any limitation of the present disclosure and application or its uses.

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

[0032] In all examples shown and discussed herein, any particular values are merely exemplary and should not be construed as limiting, and therefore, other examples of exemplary embodiments may have different values.

[0033] It should be noted that like reference numbers and letters indicate like items in subsequent drawings, so if an item is defined in one drawing, it need not be discussed further in subsequent drawings.

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

[0035] As shown in FIGS. 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 a pole 33.

[0036] Specifically, an accommodating space is defined within the housing 21. The electrode plate 20 is disposed within the accommodating 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 associated with each other. The first section 532 extends from the first surface 2213 of the electrode plate 20, 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 includes a housing 21, an electrode plate 20, a tab 50, a current collector 222, and a pole 33. The housing 21 has an accommodation space. The accommodation space has an accommodation function and is configured to accommodate and install the electrode plate 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 associated with each other. The first section 532 is positioned on the first surface 2213 and extends from the first surface 2213 of the electrode plate 20. The second section 531 is positioned 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, allowing current to 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, which is not limited herein.

[0039] Therefore, a battery cell 2 according to an embodiment of the present disclosure mainly includes a housing 21, an electrode plate 20, a tab 50, a current collector 222, and a pole. The tab 50, which includes a second section 531 and a first section 532, is a bending member, with one portion of the tab 50 extending along a first direction of the electrode plate 20 to increase the contact area with the electrode plate 20, and the other portion extending along a second direction of the electrode plate 20 to connect to the corresponding current collector 222. Specifically, the tab 50 is bent to form the second section 531, which allows current to be drawn out from the side of the electrode plate 20, and the tab 50 is bent to form the first section 532, which connects 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 current. In the battery cell 2 of the present disclosure, by using a structure in which the tab 50 is top-out and the pole 33 is side-out, the current conduction path is shortened, the current capacity at the pull-out 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 33 being side-out means that the pole 33 is pulled out from the end of the electrode plate in the first direction, and the tab 50 being top-out means that one portion of the tab 50 is provided at the end of the electrode plate 20 in the second direction.

[0040] Because one battery cell 2 can have multiple electrode plates 20, for ease 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 can include positive 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 can be positive electrode tabs 51 or negative electrode tabs 52. For example, two tabs 50, including a positive electrode tab 51 and a negative electrode tab 52, are arranged. 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 and negative electrode current collectors. The positive electrode current collector is connected to a positive electrode tab 51, and the negative electrode current collector is connected to a negative electrode tab 52. A pole assembly extends from the accommodation space and includes two poles 33. To achieve side-out of the poles 33, the two poles 33 are respectively a positive pole 31 connected to the positive electrode current collector and a negative pole 32 connected to the negative electrode current collector.

[0041] Optionally, at least one of the plurality of tabs includes an associated first section 532 and a second section 531. That is, in one tab assembly, as the case may be, only the positive electrode tab 51 includes the first section 532 and the second section 531, only the negative electrode tab 52 includes the first section 532 and the second section 531, or both the positive electrode tab 51 and the negative electrode tab 52 include the first section 532 and the second section 531, and this is not limited herein.

[0042] According to one embodiment of the present disclosure, at least one electrode post 33 has a sheet-like structure. The use of the sheet-like electrode post 33 can not only increase the area of the electrode post 33 but also increase the current-passing area of the current collector 222, which facilitates rapid charging.

[0043] 14, at least one pole post 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 connected to the first connection segment 331, and the second connection segment 332 is configured to connect to an external electric device. The first connection segment 331 and / or the second connection segment 332 are sheet-like structures.

[0044] In other words, the pole 33 mainly includes a first connecting segment 331 and a second connecting segment 332, which are connected to each other, and the first connecting segment 331 can be configured to connect to a current collector 222, such as a positive electrode current collector or a negative electrode current collector. It should be noted that the tab 50 of the present disclosure may converge a positive electrode foil or a 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 parts of the same material. It should be understood that whether the tab 50 and the current collector 222 are separately arranged or have an integral structure, all of these are within the scope of protection of the present disclosure.

[0045] Specifically, a first end of the second connection segment 332 is connected to the first connection segment 331, and a second end of the second connection segment 332 is configured to connect to an external electric 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 electric device.

[0046] It should be understood that at least one of the first connecting segment 331 and the second connecting segment 332 has a sheet-like structure. That is, the polar pillar 33 includes, but is not limited to, the following cases: Case 1: Only the first connecting segment 331 has a sheet-like structure; Case 2: Only the second connecting segment 332 has a sheet-like structure; and Case 3: Both the first connecting segment 331 and the second connecting segment 332 have a sheet-like structure.

[0047] Conventional electrode posts in the related art have a cylindrical structure and are attached to the end 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 a cylindrical structure is related to the diameter, the surface area of a cylindrical structure is small. In contrast, at least a portion of the electrode posts 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 be different from each other. 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 electrode posts 33 by expanding its dimensions in other directions. For example, if the thickness direction of the sheet-like structure is the front-rear direction, the dimensions of the sheet-like structure in the length direction and width direction can be expanded. If at least the first connection segment 331 has a sheet-like structure, the area of the electrode posts 33 is increased, and the current-passing area of the current collector 222 is increased. By increasing the area of the pole 33, the heat dissipation effect can be improved, and by increasing the current passing area, the degree of heat generation can be reduced, thereby solving the technical problem of the limited fast charging capability of the battery in the case of the conventional pole 33 in the related art.

[0048] In this embodiment, the electrode post 33 mainly includes a first connection segment 331 and a second connection segment 332, and the first connection segment 331 and / or the second connection segment 332 have a sheet-like structure to increase their area. When the first connection segment 331 has a sheet-like structure, the current passing area of the current collector 222 can be further increased. Increasing the area of the electrode post 33 promotes rapid heat dissipation from the electrode post 33, and increasing the current passing area reduces heat generation, improving the charging efficiency of the battery cell 2 and thus realizing rapid charging.

[0049] According to one embodiment of the present disclosure, at least one pole post 33 is an integrally formed member. That is, the pole post 33 is fabricated by an integral forming process, such as stamping, and includes both the first connecting segment 331 and the second connecting segment 332. In this embodiment, the use of the integrally formed 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 the present disclosure, at least one electrode post 33 is a rectangular member. That is, the first connection segment 331 and the second connection segment 332 can be combined to form a rectangular member that is a plate-shaped member. That is, the first connection segment 331 and the second connection segment 332 can extend along the same plane. For example, the first connection segment 331 is located to the left of the second connection segment 332, and the first connection segment 331 and the second connection segment 332 extend along the horizontal direction and are located in the same horizontal plane. In this embodiment, the use of an electrode post 33 having a rectangular structure facilitates connection of the electrode post 33 to the current collector 222 and an external electrical device. For example, one side of the rectangular member is connected to the current collector 222 to ensure a large and sufficient current-passing area. Furthermore, the use of a rectangular member increases both the area of the electrode post 33 and the current-passing area of the current collector 222, further improving the rapid charging capability of the battery cell 2.

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

[0052] In some specific embodiments of the present disclosure, as shown in FIGS. 1 and 11 , the electrode plate 20 has edges extending along a first direction, a second direction, and a third direction. The first direction and the second direction define a first plane, the first direction and the third direction define a second plane, and the second direction and the third direction 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. Because 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 an end of the electrode plate assembly 221 in the first direction and can be insulated from the electrode plate assembly 221. The second section 531 is positioned at the end of the electrode plate assembly 221 in the second direction and can be electrically connected to the electrode plate 20 .

[0053] As an example, a positive electrode tab 51 will be described as including a second section 531 and a first section 532. The length 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 the 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 on the left or right side 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 a major surface and a minor surface, and the area of the major surface is larger than the area of the minor surface. The use of a sheet-like structure can facilitate bending and installation and positioning of the tabs 50. The use of a sheet-like structure also facilitates the existence of a large, flat surface with a large area for connecting to multiple electrode plates 20.

[0055] It should be understood that when the electrode post 33 is positioned at the end of the electrode plate assembly 221 in the first direction, the explosion-proof valve 1 can be designed to be positioned at the end of the electrode plate assembly 221 in the second direction or the end of the electrode plate assembly 221 in the third direction, and the third direction can be 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 arranging the explosion-proof valve 1 at the end of the electrode plate assembly 221 in the second direction, more space is left for the sheet-like electrode post 33 of the present disclosure, thereby further increasing the area of the electrode post 33. Furthermore, to improve 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 length direction of the electrode posts 33 extends along the second direction, and the width direction of the electrode posts 33 extends along the first direction. For example, the sheet-shaped electrode posts 33 extend approximately in the left-right direction, and the electrode post assembly also extends approximately in the left-right direction, and the sheet-shaped electrode posts 33 and the electrode post assembly generally have parallel structures. In this embodiment, defining the extension direction of the electrode posts 33 facilitates processing and assembly of the electrode posts 33 and promotes heat dissipation from the sheet-shaped electrode posts 33.

[0057] According to one embodiment of the present disclosure, as shown in FIGS. 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 the third direction. The length direction of each third surface 2211 extends along the first direction, and the height direction of each third surface 2211 extends along the second direction. The two second surfaces 2212 are spaced apart in the second direction. Two ends of each second surface 2212 in the third direction are respectively connected to the two third surfaces 2211. The two first surfaces 2213 are spaced apart in the first direction. Two ends of each first surface 2213 in the third direction are respectively connected to the two third surfaces 2211. The two ends of each first surface 2213 in the second direction are respectively 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 a first direction, the height direction of the electrode plate 20 is defined as a second direction, and the thickness direction of the electrode plate 20 is defined as a third direction. The first direction may extend left-right, the second direction may extend up-down, and the third direction may extend front-to-back. Because the electrode plate assembly 221 is formed by stacking 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 described 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 spaced apart in the front-rear direction, the height direction of each third surface 2211 extends in the up-down direction, and the length direction of each third surface 2211 extends in the left-right direction. The two second surfaces 2212 are spaced apart in the up-down direction, one second surface 2212 is located above the third surface 2211, and the other second surface 2212 is located below the third surface 2211, and the front and rear ends of each second surface 2212 are connected to the third surface 2211. The two first surfaces 2213 are spaced apart in the left-right direction, and the front and rear ends of each first surface 2213 are connected to the two third surfaces 2211, respectively, and the upper and lower ends are connected to the second surface 2212, respectively. In this case, the first section 532 is disposed on the first surface 2213, and the second section 531 is disposed on the second surface 2212. That is, the tab 50 is bent to form an L-shaped structure, with the first section 532 insulated from the electrode plate 20 and the second section 531 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. As long as the positive electrode plates on the same side of the electrode plate assembly 221 can be electrically connected to the second section 531, or the negative electrode plates on the same side of the electrode plate assembly 221 can be electrically connected to the first section 532, the second surface 2212 and the first surface 2213 can be clearly formed depending on the particular arrangement of the positive electrode plates, negative electrode plates, and separator. Either case is within the scope of the concept of the present disclosure.

[0060] In this embodiment, by defining the shape of the electrode plate 20 and the shape of the electrode plate assembly 221, it can be seen that the bent tabs 50 of the present disclosure can be applied to the existing electrode plate assembly 221, which aids in drawing current from the sides.

[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 the first direction. For example, a first end of the second section 531 extends in the first direction, a second end of the second section 531 is connected to the upper end of the first section 532, and the first section 532 extends in the second direction. In the first direction, the first end of the second section 531 may be flush with the end of the electrode post assembly or may be shorter than the end of the electrode post assembly. That is, 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 within the scope of the concept of the present disclosure.

[0062] In some specific embodiments of the present disclosure, the surface area of the second surface 2212 is greater than the surface area of the first surface 2213. For example, the dimension of the electrode plate 20 in the first direction is greater than the dimension of the electrode plate 20 in the second direction, the pole assembly is disposed at the end of the electrode plate assembly 221 in the first direction, the second section 531 extends along the first direction and is positioned at the end of the electrode plate assembly 221 in the second direction, and the first section 532 extends along the second direction and is positioned at the end of the electrode plate assembly 221 in the first direction. That is, the electrode plate 20 has a length direction and a height direction. The length direction can be used as the first direction, and the height direction can be used as the second direction. That is, the height dimension is smaller than the length dimension. When the first direction extends left-right and the second direction extends up-down, the pole assembly can be positioned on the left or right side of the electrode plate assembly 221, and accordingly, the first section 532 is also positioned on the left or right side of the electrode plate assembly 221, and the second section 531 is positioned on the upper or lower side of the electrode plate assembly 221.

[0063] In this embodiment, by providing the first section 532 on the small-area first surface 2213 and the second section 531 on the large-area second surface 2212, the electrode post assembly also corresponds to the first surface 2213 accordingly. This arrangement avoids the space constraints in the height direction of the electrode plate assembly 221 caused by providing the electrode post assembly on the end of the electrode plate assembly 221 extending in the second direction, thereby avoiding a 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 arranging the second section 531 to correspond to the large-area second surface 2212, the current-passing area of the tab 50 can be further increased while the tab 50 is topped out.

[0064] According to one embodiment of the present disclosure, as shown in FIGS. 1 to 3 , the positive electrode pole 31 of the pole assembly is provided at one end in the first direction of the electrode plate assembly 221, and the negative electrode pole 32 is provided at the other end in the first direction of the electrode plate assembly 221. 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 assembly is positioned on the left side of the electrode plate assembly 221, and the negative electrode pole 32 of the pole assembly is positioned on the right side of the electrode plate assembly 221. It should be understood that, although one electrode plate assembly 221 is arranged with one pole assembly in this embodiment, this is not limiting.

[0065] 1 to 3 , the second section 531 corresponding to the positive electrode pole 31 is positioned at one end in the second direction of the electrode plate assembly 221, and the second section 531 corresponding to the negative electrode pole 32 is positioned at the other end in the second direction of the electrode plate assembly 221. For example, when the positive electrode pole 31 of the pole assembly is provided at one end in the first direction of the electrode plate assembly 221 and the negative electrode pole 32 is provided at the other end in the first direction of the electrode plate assembly 221, the second section 531 corresponding to the positive electrode pole 31 is positioned at one end in the second direction of the electrode plate assembly 221, and the second section 531 corresponding to the negative electrode pole 32 is positioned at the other end in the second direction of the electrode plate assembly 221. When the first direction is the left-right direction and the second direction is the up-down direction, the second section 531 corresponding to the positive electrode pole 31 of one pole 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 assembly may be positioned below the electrode plate assembly 221.

[0066] 8 to 10 , the second section 531 corresponding to the positive electrode pole 31 and the second section 531 corresponding to the negative electrode pole 32 are positioned at the same end in the second direction of the electrode plate assembly 221 and are spaced apart in the first direction. For example, when the positive electrode pole 31 of a pole assembly is disposed at one end in the first direction of the electrode plate assembly 221 and the negative electrode pole 32 is disposed at the other end in the first direction of the electrode plate assembly 221, the second section 531 corresponding to the positive electrode pole 31 and the second section 531 corresponding to the negative electrode pole 32 are positioned at the same end in the second direction of the electrode plate assembly 221. When the first direction is the left-right direction and the second direction is the up-down direction, 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 assembly can be positioned above or below the electrode plate assembly 221.

[0067] 11 , the positive electrode pole 31 and the negative electrode pole 32 of a pole assembly are positioned at the same end in the first direction of the electrode plate assembly 221, the second section 531 corresponding to the positive electrode pole 31 is positioned at one end in the second direction of the electrode plate assembly 221, and the second section 531 corresponding to the negative electrode pole 32 is positioned at the other end in the second direction of the electrode plate assembly 221. That is, the positive electrode pole 31 and the negative electrode pole 32 of one pole assembly can be positioned at the same end of the electrode plate assembly 221 and at the same end in the first direction of the electrode plate assembly 221. For example, the first direction extends in the left-right direction, and the second direction extends in the up-down direction. At this time, 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, and 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 FIG. 11 , two electrode plate assemblies 221 are provided, and the two electrode plate assemblies 221 are arranged consecutively in a first direction. Each electrode plate assembly 221 has at least one electrode pole assembly, and the second sections 531 corresponding to the positive electrode pole 31 and the negative electrode pole 32 of each electrode plate assembly 221 are spaced apart in the second direction. For example, the two electrode plate assemblies 221 are arranged in the left-right direction. The positive electrode pole 31 and the negative electrode pole 32 of one electrode 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 the negative electrode pole 32 of the other electrode 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 on the upper side of 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 on the lower side of the right side of the electrode plate assembly 221 and extends in the left-right direction.

[0069] In some specific embodiments of the present disclosure, as shown in FIG. 4 , one electrode plate assembly 221 is arranged with multiple electrode pole assemblies, each corresponding to one current collector assembly and one tab assembly. It should be understood that one or more electrode plate assemblies 221 may be arranged in this embodiment. For example, when one electrode plate assembly 221 is arranged, the single electrode plate assembly 221 may be arranged with multiple electrode pole assemblies. Accordingly, for example, the single electrode plate assembly 221 may be arranged with two electrode pole assemblies. The positive electrode poles 31 of the two electrode pole assemblies are positioned on the left side of the electrode plate assembly 221 and are spaced apart vertically. The negative electrode poles 32 of the two electrode pole assemblies are positioned on the right side of the electrode plate assembly 221 and are spaced apart vertically. When two electrode plate assemblies 221 are arranged, the two electrode plate assemblies 221 may be arranged horizontally, respectively, as a left electrode plate assembly and a right electrode plate assembly. The positive electrode post 31 of the left electrode plate assembly is positioned above the negative electrode post 32 of the left electrode plate assembly, and the positive electrode post 31 of the right electrode plate assembly is positioned above the negative electrode post 32 of the right electrode plate assembly.

[0070] 4 , the positive electrode pole 31 of each electrode pole assembly is positioned at one end in the first direction of the electrode plate assembly 221, the negative electrode pole 32 of each electrode pole assembly is positioned at the other end in the first direction of the electrode plate assembly 221, the second sections 531 corresponding to the plurality of positive electrode poles 31 are positioned at one end in the second direction of the electrode plate assembly 221, and the second sections 531 corresponding to the plurality of negative electrode poles 32 are positioned at the other end in the second direction of the electrode plate assembly 221. That is, when one electrode plate assembly 221 is arranged with multiple electrode pole assemblies, the positive electrode pole 31 of each electrode pole assembly is positioned at one end in the first direction of the electrode plate assembly 221, and the negative electrode pole 32 of each electrode pole assembly is positioned at the other end in the first direction of the electrode plate assembly 221 to achieve two polarities on different sides. The second sections 531 corresponding to the multiple positive electrode poles 31 are positioned at one end of the electrode pole assembly in the second direction, and the second sections 531 corresponding to the multiple negative electrode poles 32 are positioned at the other end of the electrode plate assembly 221 in the second direction. For example, if the first direction is the left-right direction and the second direction is the up-down direction, multiple electrode pole assemblies are provided in one electrode plate assembly 221, with the positive electrode poles 31 of each electrode pole assembly positioned on the left side of the electrode pole assembly and the negative electrode poles 32 of each electrode pole assembly positioned on the right side of the electrode pole assembly. The second sections 531 corresponding to the positive electrode poles 31 of each electrode pole assembly are positioned on the upper side of the electrode plate assembly 221 and are arranged consecutively in the thickness direction of the electrode plate assembly 221. The second sections 531 corresponding to the negative electrode poles 32 of each electrode pole assembly are positioned on the lower side of the electrode plate assembly 221 and are arranged consecutively in the thickness direction of the electrode plate assembly 221.

[0071] 5 , at the same end of the electrode plate assembly 221 in the 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 up-and-down 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 positioned at the same end of the electrode plate assembly 221 in the 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, and L1 <L2である。

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

[0074] The battery cell 2 of the present disclosure will be described in detail below with reference to specific embodiments.

[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-rear direction, i.e., the front-rear direction is defined as the third direction.

[0077] The 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 positioned below the electrode plate assembly 221 and extends in the left-right direction. The first section 532 of the positive electrode tab 51 is positioned on the left side 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 on the right side of the electrode plate assembly 221 and extends in the up-down direction.

[0080] That is, a structural design in which top-out and bent single tabs are arranged on two different sides and a single pole post 33 is arranged on each side is used in embodiment 1. The current conduction path is shown in FIG.

[0081] Embodiment 2

[0082] As shown in Figures 4 to 7, 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-rear direction, i.e., the front-rear direction is defined as the third direction.

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

[0084] The positive electrode tab 51 corresponding to each positive electrode pole 31 includes a second section 531 and a first section 532. The positive electrode pole 31 of the first pole pole assembly is positioned above the positive electrode pole 31 of the second pole pole assembly. The first section 532 corresponding to the positive electrode pole 31 of the first pole pole assembly is positioned on the left side of the electrode plate assembly 221, and the second section 531 corresponding to the positive electrode pole 31 of the first pole 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 pole assembly is positioned behind the second section 531 corresponding to the positive electrode pole 31 of the second pole pole assembly. The first section 532 corresponding to the positive electrode pole 31 of the first pole assembly is connected to the top of one positive electrode 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 collector in the front-to-back direction.

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

[0086] That is, a structural design in which multiple top-out and bent single tabs 50 are arranged on two different sides and multiple poles 33 of the same polarity are arranged on each side is used in embodiment 2. If the height of the battery cell 2 is large, the number of poles 33 can be adjusted according to the actual design size of the poles 33. The current conduction path is as shown in FIG.

[0087] Embodiment 3

[0088] As shown in FIGS. 11 to 13, two electrode plate assemblies 221, a first electrode plate assembly 221 and a second electrode plate assembly 221, are arranged. Each electrode plate assembly 221 is arranged with one pole 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 pole 31 and the negative electrode pole 32 of the first electrode plate assembly 221 are provided on the left side of the first electrode plate assembly 221, with the positive electrode pole 31 positioned above the negative electrode pole 32. Similarly, the positive electrode pole 31 and the negative electrode pole 32 of the second electrode plate assembly 221 are provided on the right side of the second electrode plate assembly 221, with the positive electrode pole 31 positioned above the negative electrode pole 32.

[0089] For 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, and 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, and 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] With respect to 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] That is, a structural design in which top-out and bent single tabs 50 are arranged on two different sides and multiple pole posts 33 of different polarities are arranged on each side is used in embodiment 3. The current conduction path is as shown in Fig. 10.

[0092] Embodiment 4

[0093] 8 to 10, one electrode plate assembly 221 is arranged together with one pole assembly. The pole assembly includes a positive electrode pole 31 and a 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.

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

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

[0096] That is, a structure in which the top-out and bent single tabs 50 are arranged on the same side and a single pole post 33 is arranged on each side is used in embodiment 4. The current conduction path is as shown in FIG.

[0097] The present disclosure also provides a battery pack 1000. The battery pack 1000 includes a battery cell 2 and a heat transfer member 40. The battery cell 2 is the battery cell 2 according to any one of the above embodiments. The heat transfer member 40 can transfer heat 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 transfer member 40, the heat of the battery cell 2 can be transferred to the outside in a timely manner, improving heat dissipation efficiency and facilitating rapid charging.

[0098] According to an embodiment of the present disclosure, the battery pack 1000 further includes a tray. A holding space is defined in the tray, the battery cells 2 are positioned in the holding space, and the heat transfer member 40 is positioned in the holding space, and the heat transfer member 40 is thermally conductively connected to the battery cells 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 near the second surface 2212 to the outside to cool a 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, which 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 electrode posts 33, and the second heat conduction member 44 extends toward a position on the housing 21 corresponding to the second surface 2212. By disposing the second heat conduction member 44, heat near the electrode posts 33 can be transported outward, enhancing the cooling effect and cooling rate, thereby facilitating rapid charging.

[0101] According to one embodiment of the present disclosure, a plurality of battery cells 2 are provided, and the second thermally conductive members 44 are thermally conductively connected to the poles 33 of two adjacent battery cells 2, respectively. For example, the plurality of battery cells 2 are arranged consecutively in a third direction, and the second thermally conductive members 44 are thermally conductively connected to the poles 33 of two adjacent battery cells 2, respectively, in the third direction. In other words, a plurality of battery cells 2 are provided, and the plurality of battery cells 2 are arranged consecutively in the third direction, which may be the thickness direction of the battery cells 2. The second thermally conductive members 44 are thermally conductively connected to the poles 33 of two adjacent battery cells 2, respectively, in the third direction.

[0102] For example, two battery cells 2, a first battery cell and a second battery cell, are arranged in the third direction. 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 one pole 33 of the second pole assembly is similarly positioned to the left of the second battery cell. Since the first battery cell and the second battery cell 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 arranged adjacent to each other in the third direction with a gap therebetween. A second thermally conductive member 44 is provided in this gap, and heat can be transported from the poles 33 of the two battery cells 2 by the one second thermally conductive member 44. Optionally, in the second direction, the length of the second heat conducting member 44 may be equal to or longer than the length of the pole pillar 33. If the lengths are equal, the heat dissipation effect of the pole pillar 33 can be ensured, and if the length is equal to the length of the pole pillar 33, heat can be transported from the pole pillar 33 to a wider area.

[0103] Furthermore, in order to enhance the heat transfer effect, the second heat conducting member 44 is in area contact with the electrode post 33. For example, the electrode post 33 has a sheet-like structure in order 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 disposed facing the first surface 2213 and is capable of exchanging heat with the pole posts 33.

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

[0106] According to one embodiment of the present disclosure, the heat sink 45 includes at least one tubular member having a first fluid channel therein through which a cooling fluid flows, and a portion of the tubular member forms at least a portion of the heat transfer 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 cooling body 402, which is thermally conductively connected to the housing 21 corresponding to the second surface 2212. In this embodiment, by arranging the cooling body 402, the heat dissipation efficiency and heat dissipation effect of heat near the second surface 2212 are improved.

[0108] In some specific embodiments of the present disclosure, the first thermally conductive member 43 is thermally conductively connected to the battery cells 2 and the cooling body 402, respectively. That is, heat exchange between the battery cells 2 and the cooling body 402 can be realized by the first thermally conductive member 43. In this embodiment, by disposing the first thermally conductive member 43, damage to the battery cells 2 due to direct contact of the cooling body 402 with the battery cells 2 can be avoided, and an excessively large design of the cooling body 402 can also be avoided. When multiple battery cells 2 are disposed, one first thermally conductive member 43 can correspond to the multiple battery cells 2.

[0109] According to one embodiment of the present disclosure, the cooling body 402 and the first thermally conductive member 43 each have a sheet-like structure, and the first thermally conductive member 43 contacts the cooling body 402 and the battery cell 2, respectively. For example, the upper end surface of the first thermally conductive member 43 contacts the lower end surface of the cooling body 402, and the lower end surface of the first thermally conductive member 43 contacts 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 on the battery cell 2, and improving stress balance and heat dissipation uniformity among multiple battery cells 2 when multiple battery cells 2 are arranged.

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

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

[0112] In some specific embodiments of the present disclosure, the cooling body 402 has a second fluid channel therein, and the heat sink 45 has a first fluid channel therein, and the first fluid channel communicates with the second fluid channel. In this case, the cooling body 402 can be used as a liquid cooling plate. By supplying a fluid into the heat sink 45, the heat dissipation effect near the pole 33 can be improved.

[0113] According to one embodiment of the present disclosure, two cooling bodies 402 are provided, and the battery cell 2 is positioned between the cooling bodies 402. That is, the heat transfer member 40 includes two cooling bodies 402. For simplicity, the two cooling bodies are a first cooling body 41 and a second cooling body 42. The first cooling body 41 can be disposed above the battery cell 2, and the second cooling body 42 can be disposed below the battery cell 2. For example, the electrode plate 20 has a first direction and a second direction. The dimension of the electrode plate 20 in the first direction is larger than the dimension in the second direction. The first cooling body 41 is disposed at one end of the battery cell 2 in the second direction, and the second cooling body 42 is disposed at the other end of the battery cell 2 in the second direction.

[0114] The first cooling body 41 can conduct heat from the top of the battery cell 2, and the second cooling body 42 can conduct heat from the bottom of the battery cell 2. In this embodiment, the first cooling body 41 and the second cooling body 42 cooperate to form a sandwich-like cooling structure for cooling the battery cell 2 on two sides, reducing 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 cooling body 41 and the second cooling body 42 on both sides of the battery cell 2, heat dissipation is achieved in this direction. By combining with the electrode posts 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 electrode posts 33 enhance the heat dissipation effect.

[0115] Furthermore, in order to enhance the heat dissipation effect and to avoid excessive space being occupied in the vertical direction due to the tray, the lower plate, the first cooling body 41, and the second cooling body 42 being present in the vertical direction, the first cooling body 41 can be used as the upper plate of the tray, and the second cooling body 42 can be used as the lower plate of the tray.

[0116] When the tab 50 has a sheet-like structure, a large surface of the tab 50 may be placed facing the cooling body 402 to increase the heat dissipation rate of the tab 50 .

[0117] It should be understood that the cooling body 402 can be disposed on the side of the explosion-proof valve 1, away from the electrode plate assembly 221. For example, the cooling body 402 is disposed above the explosion-proof valve 1. Optionally, an avoidance structure is disposed on the cooling body 402 to avoid interfering with the opening of the explosion-proof valve 1. The gas discharge direction 11 of the explosion-proof valve 1 is shown in FIG. 17, where 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 connection member 46. At least a portion of the connection member 46 is positioned between the heat sink 45 and the electrode pole 33 and is thermally conductively connected to the heat sink 45 and the electrode pole 33, respectively. By disposing the connection member 46, the problems of difficult installation and low robustness of the heat sink and the electrode pole 33 are solved. When the electrode pole 33 is connected to the heat sink 45 by the connection member 46, the heat sink 45 can be positioned outside the connection member 46, and the electrode pole 33 can be positioned inside the connector 46.

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

[0120] 18 and 19 , the connecting member 46 further includes a fourth connecting portion 464. The fourth connecting portion 464, together with the first connecting portion 461 and the second connecting portion 462, is located on the same side of the third connecting portion 463. The fourth connecting portion 464 is located at at least one end of the third connecting portion 463 in the second direction. The fourth connecting portion 464 serves to limit the second heat conducting member 44. Optionally, two fourth connecting portions 464 are arranged, one fourth connecting portion 464 being located at an upper end of the third connecting portion 463 and the other fourth connecting portion 464 being located at a lower end of the third connecting portion 463. It can be seen that the first connection portion 461, the second connection portion 462, the third connection portion 463, and the fourth connection portion 464 allow heat to be conducted in multiple directions from the periphery of the second thermally conductive member 44, so that the heat can be transported timely and efficiently to the heat sink 45. For example, the second thermally conductive member 44 is thermally conductively connected to the cooling body 402 by the fourth connection portion 464.

[0121] Furthermore, the second heat conducting member 44 is also thermally conductively connected to the current collector 222 corresponding to the 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 a side plate 211 and a cover plate 212, which fit together to form a receiving space. The pole 33 extends from the receiving space through 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 plate 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 33 is defined as L1, the length of the cover plate 212 is defined as L2, the gap between the pole 33 and the cover plate 212 is defined as L3, the gap between two adjacent poles 33 is defined as L4, and the number of poles 33 is defined as N, and these parameters are expressed by the following formula: L1=(L2-L3 * 2-(N-1)L4) / N.

[0124] Optionally, at least one end of the connection member 46 is thermally conductively connected to the cooling body 402 in the second direction. The second thermally conductive member 44 can be made of a material with high thermal conductivity. When the second thermally conductive member 44 is disposed between the cover plate 212 and the connection member 46, the third connection portion 463 can conduct heat upward or downward along the cover plate 212 to the cooling body 402, thereby increasing heat dissipation. The heat of the electrode post 33 and the current collector 222 is generally carried away by the connection member 46, thereby improving fast charging capability. Specific heat dissipation paths can include, but are not limited to, the following paths:

[0125] Heat dissipation path 1: bent tab → pole post 33 → connection member 46 → first heat conduction member 43 → both side coolers; Heat dissipation path 2: bent tab → pole post 33 → connection member 46 → heat sink 45; Heat dissipation path 3: bent tab → cover plate 212 → second heat conduction member 44 → connection member 46 → first heat conduction member 43 → both side cooling bodies; Heat dissipation path 4: bent tab → cover plate 212 → second heat conduction member 44 → connection member 46 → heat sink 45; Heat dissipation path 5: top-out tab → housing 21 → first heat conduction member 43 → both side cooling bodies.

[0126] According to an embodiment of the present disclosure, the connection member 46 is welded together with the electrode post 33. Welding can increase connection reliability. Furthermore, the side of the electrode post 33 is in surface contact with the connection member 46. For example, to increase the welding area between the electrode post 33 and the connection member 46, the length direction of the electrode post 33 extends in the vertical direction and the width direction extends in the horizontal direction, and the side of the electrode post 33 in the thickness direction of the electrode plate assembly 221 contacts the side of the connection member 46. Optionally, the connection member 46 is coupled to a heat sink 45 to improve assembly efficiency.

[0127] In summary, according to the electrode posts 33, battery cells 2, and battery pack 1000 provided in the embodiments of the present disclosure, the battery cells 2 can be designed with one or more tabs 50 that can be flexibly arranged on the same or different sides of the battery cells 2. Furthermore, to improve the high-rate fast charging capability, a new structure of the electrode posts 33 and a design of the heat transfer member 40 with a high heat dissipation path can be adopted. Unlike conventional battery cores with positive and negative electrode posts 33 on two sides, the present disclosure increases the heat dissipation area of the current collector 222 to enhance the current-passing capacity of the electrode plate assembly 221. By combining a high-heat dissipation design, such as the cooling bodies 204 arranged on two sides, heat is carried away from the electrode posts 33 by the connecting member 46 mated with the heat sink 45 and the second heat-conducting member 44 added between the connecting member 46 and the cover plate 212, thereby improving the fast charging capability of the power battery as a whole.

[0128] The present disclosure further provides a vehicle, which includes the battery pack 1000 according to any of the above embodiments. Because the battery pack 1000 has an excellent heat dissipation effect and therefore an improved fast charging capability, the vehicle of the present disclosure also has the advantage of high fast charging capability, which will not be described again here.

[0129] Although several specific embodiments of the present disclosure have been described in detail by way of example, 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 the present 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 the present disclosure. The scope of the present disclosure is defined by the appended claims. [Explanation of symbols]

[0130] 1000 battery packs 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 Connecting Segment 332 Second Connecting Segment 40 Heat transfer material 401 Thermal Conductive Materials 402 Cooling body 41 First cooling body 42 Second cooling body 43 First heat conducting member 44 Second heat conducting member 45 Heat sink 46 Connecting member 461 First Connection 462 Second Connection 463 Third Junction 464 Fourth Junction 50 tabs 51 Positive electrode tab 52 Negative electrode tab 532 First Section 531 Second Section

Claims

1. a housing (21) having a storage space defined therein; an electrode plate (20) disposed in the receiving space and having at least a first surface and a second surface; a tab (50) and a current collector (222), the tab (50) being attached to the electrode plate (20), the tab (50) having a first section (532) and a second section (531) associated with each other, the first section (532) extending from the first surface of the electrode plate (20), the current collector (222) being attached to the first section (532), and the second section (531) extending from the second surface of the electrode plate (20), transmitting current between the second section (531) and the second surface; a pole (33) provided on the current collector (222) and extending from the housing (21); A battery cell (2).

2. 2. The battery cell (2) of claim 1, wherein at least one pole (33) is a sheet-like structure.

3. the electrode plate (20) has edges extending along a first direction, a second direction, and a third direction, the first direction and the second direction defining a first plane, the first direction and the third direction defining a second plane, and the second direction and the third direction defining a third plane; 3. The battery cell (2) according to claim 1 or 2, wherein the first surface and the second surface are connected, the first surface is parallel to the third plane, and the second surface is parallel to the second plane.

4. The battery cell (2) according to claim 3, wherein the surface area of the second face is greater than the surface area of the first face.

5. 4. The battery cell (2) according to claim 3, wherein the poles (33) comprise a positive electrode pole (31) and a negative electrode pole (32), the second section (531) corresponding to the positive electrode pole (31) being positioned at one end of the electrode plate (20) in the second direction, and the second section (531) corresponding to the negative electrode pole (32) being positioned at the other end of the electrode plate (20) in the second direction.

6. 4. The battery cell (2) of claim 3, wherein the pole (33) comprises a positive electrode pole (31) and a negative electrode pole (32), and the second section (531) corresponding to the positive electrode pole (31) and the second section (531) corresponding to the negative electrode pole (32) are positioned at the same end of the electrode plate (20) in the second direction and are spaced apart in the first direction.

7. 6. The battery cell (2) 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. 6. The battery cell (2) 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. an electrode plate assembly (221) comprising a plurality of stacked electrode plates (20), the electrode plates (20) comprising positive and negative electrode plates; a tab assembly comprising a positive electrode tab (51) and a negative electrode tab (52), the positive electrode tab (51) being electrically connected to the positive electrode plate and the negative electrode tab (52) being electrically connected to the negative electrode plate; a current collector assembly, the 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 (51) and the negative electrode current collector being connected to the negative electrode tab (52); a pole assembly comprising two poles (33), the two poles (33) being the positive electrode pole (31) connected to the positive electrode current collector and the negative electrode pole (32) connected to the negative electrode current collector, respectively; The battery cell (2) according to any one of claims 3 to 8, comprising:

10. 10. The battery cell (2) according to claim 9, wherein a plurality of electrode plate assemblies (221) are arranged, each of the electrode plate assemblies (211) being arranged with one tab assembly, one current collector assembly, and one pole assembly.

11. 11. The battery cell (2) according to claim 9 or 10, wherein a plurality of pole assemblies, a plurality of tab assemblies, and a plurality of current collector assemblies are provided, and the plurality of pole assemblies are attached to one electrode plate assembly (221).

12. A battery cell (2) according to any one of claims 1 to 11; a heat transfer member (40) that transfers heat near the first surface of the battery cell (2) to the outside of the housing (21) corresponding to the second surface; A battery pack (1000) comprising:

13. The heat transfer member (40) is 13. The battery pack (1000) of claim 12, comprising a thermally conductive member (401) provided in the housing (21) and thermally conductively connected to the pole (33), the thermally conductive member (401) extending toward a position in the housing (21) corresponding to the second surface.

14. The battery pack (1000) according to claim 13, wherein a plurality of battery cells (2) are provided, and the heat conducting member (401) is thermally connected to the poles (33) of two adjacent battery cells (2), respectively.

15. The battery pack (1000) according to any one of claims 12 to 14, further comprising a heat sink (44), at least a portion of which is arranged facing the first surface and which exchanges heat with the pole (33).

16. 16. The battery pack (1000) of claim 15, wherein the heat sink (44) comprises at least one tubular member having a first fluid channel therein through which a cooling fluid flows, and a portion of the tubular member forms at least a portion of the heat transfer member (40).

17. The battery pack (1000) according to any one of claims 12 to 16, further comprising a cooling body (402) thermally conductively connected to the housing (21) corresponding to the second surface.

18. 18. The battery pack (1000) of claim 17, wherein the cooling body (402) has a second fluid channel therein through which a cooling fluid flows, and the cooling body (402) is thermally conductively connected to the heat transfer member (40).

19. 18. The battery pack (1000) according to claim 17, wherein two cooling bodies (402) are provided, and the battery cell (2) is positioned between the cooling bodies (402).

20. A vehicle comprising a battery pack (1000) according to any one of claims 12 to 19.

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