Battery packs and vehicles

Abstract

A vehicle has a battery pack. The battery pack includes a single-cell battery and a heat transfer element. The single-cell battery includes a housing, cells, and a plurality of poles. A storage space is defined within the housing, and the cells are disposed within the storage space. The housing has at least a first surface and a second surface. The poles are disposed on the cells and extend from the first surface to the outside of the housing, and at least one of the poles is sheet-shaped. The heat transfer element can transfer heat from the single-cell battery adjacent to the first surface to the second surface.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to Chinese Patent Application No. 2022110013407, entitled "BATTERY PACK AND VEHICLE," filed on August 19, 2022. The entire contents of the above application are incorporated herein by reference.

[0002] The present disclosure relates to the field of batteries, and more particularly to battery packs and vehicles. [Background technology]

[0003] In the related art, power battery systems generate a large amount of heat during fast charging, and the insufficient heat dissipation capacity limits the fast charging capability of conventional power battery systems. Summary of the Invention [Problem to be solved by the invention]

[0004] The objective of the present disclosure is to provide a battery pack, which can solve the technical problem in the related art that the fast charging capability is limited due to the insufficient heat dissipation effect of the battery pack. [Means for solving the problem]

[0005] According to a first aspect of the present disclosure, a battery pack is provided that includes a cell and a heat transfer member. The cell includes a housing, a cell core, and a plurality of poles. An accommodation space is defined within the housing. The cell core is disposed within the accommodation space. The housing has at least a first surface and a second surface. Each of the poles is disposed on the cell core and extends from the first surface to an exterior of the housing. At least one of the poles has a sheet-like structure. The heat transfer member is configured to transfer heat from the cell adjacent to the first surface to the second surface.

[0006] According to one embodiment of the present disclosure, the housing 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. The second direction and the third direction define a third plane. The first surface is connected to the second surface. The first surface is parallel to the third plane. The second surface is parallel to the second plane.

[0007] According to one embodiment of the present disclosure, the surface area of the second surface is greater than the surface area of the first surface.

[0008] According to one embodiment of the present disclosure, the heat transfer member includes a thermally conductive member disposed on the first surface and thermally connected to the pole, the thermally conductive member extending toward the second surface to transfer heat from the pole to the second surface.

[0009] According to one embodiment of the present disclosure, a plurality of cells are arranged, and a heat conducting member is thermally connected to each pole of two adjacent cells.

[0010] According to one embodiment of the present disclosure, the heat transfer member further includes a first connecting piece, a second connecting piece, and a third connecting piece that are connected in series. The first connecting piece, the second connecting piece, and the third connecting piece are fitted together to form an accommodating groove. The accommodating groove is configured to accommodate the heat transfer member. The first connecting piece is connected to one pole of the two cells. The second connecting piece is connected to the other pole of the two cells. The third connecting piece is located between the first connecting piece and the second connecting piece and is connected to the first connecting piece and the second connecting piece.

[0011] According to one embodiment of the present disclosure, the heat transfer member further includes a fourth connecting piece disposed at an end of the third connecting piece adjacent to the second surface, the fourth connecting piece being thermally connected to the heat conduction member and the second surface.

[0012] According to one embodiment of the present disclosure, the battery pack further includes a heat sink, at least a portion of which is disposed opposite the first surface and configured to exchange heat with the electrode.

[0013] According to one embodiment of the present disclosure, a heat sink includes at least one tubular member having a first flow path for a cooling fluid to flow through, a portion of the tubular member being formed as at least a portion of a heat transfer member.

[0014] According to one embodiment of the present disclosure, the battery pack further includes a cooler, the cooler being thermally connected to the second surface.

[0015] According to one embodiment of the present disclosure, a second flow path for a cooling fluid to flow is provided in the cooler, and the cooler is thermally connected to the heat transfer member.

[0016] According to one embodiment of the present disclosure, two coolers are arranged, and the cell is located between the two coolers.

[0017] According to one embodiment of the present disclosure, the poles are parallel to the third plane.

[0018] According to a second aspect of the present disclosure, there is provided a vehicle including a battery pack according to any of the above embodiments.

[0019] According to one embodiment of the present disclosure, in one aspect, the sheet-shaped poles increase the overcurrent area, and in another aspect, the heat transfer member achieves rapid heat dissipation at positions close to the first surface, particularly at the positions where the poles are located, thereby achieving rapid charging of the battery pack.

[0020] Other features and advantages of the present disclosure will become apparent from the following detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings.

[0021] The above and / or additional aspects and advantages of the present disclosure will become apparent and understandable from the following description of the embodiments with reference to the drawings. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 2 is a partially exploded view of a cell according to one embodiment of the present disclosure. [Figure 2] FIG. 1 is a schematic diagram of a pole and current collector assembly according to one embodiment of the present disclosure. [Figure 3] FIG. 1 is a schematic structural diagram of a cell according to an embodiment of the present disclosure. [Figure 4] FIG. 4 is a schematic diagram of the current flow direction of the cell in FIG. 3. [Figure 5] 1 is a schematic structural diagram of a cell from one perspective according to an embodiment of the present disclosure; [Figure 6] FIG. 2 is a schematic structural diagram of a cell from another perspective according to an embodiment of the present disclosure. [Figure 7] FIG. 7 is a schematic diagram of the current flow direction of the cells in FIGS. 5 and 6. [Figure 8] 1 is a schematic structural diagram of a cell from one perspective according to an embodiment of the present disclosure; [Figure 9] FIG. 2 is a schematic structural diagram of a cell from another perspective according to an embodiment of the present disclosure. [Figure 10] FIG. 10 is a schematic diagram of the current flow direction of the cells in FIGS. 8 and 9. [Figure 11] FIG. 1 is a schematic diagram of an assembly of a cell and a heat dissipation assembly according to one embodiment of the present disclosure. [Figure 12] FIG. 10 is a partially exploded view of a battery pack according to another embodiment of the present disclosure. [Figure 13] FIG. 1 is a schematic diagram of a cell and explosion-proof valve assembly according to one embodiment of the present disclosure. [Figure 14] 1 is a schematic structural diagram of a connecting member according to an embodiment of the present disclosure from one perspective; [Figure 15] FIG. 10 is a schematic structural diagram of a connecting member according to an embodiment of the present disclosure from another perspective. [Figure 16] FIG. 10 is a schematic diagram of mating of a second thermal conduction member with two cells according to one embodiment of the present disclosure. [Figure 17] FIG. 17 is an enlarged view of the circled area A in FIG. 16. [Figure 18] FIG. 1 is a schematic diagram of a pole and cover plate assembly according to one embodiment of the present disclosure.

[0023] In the drawings, the symbols are as follows: 1000: battery pack, 1: explosion-proof valve, 11: exhaust direction, 2: cell, 21: housing, 211: side plate, 212: cover plate, 213: first surface, 214: second surface, 22: cell core, 221: cell core body, 222: current collector, 3: pole group, 31: positive electrode, 32: negative electrode, 33: pole, 331: first connection area, 332: second connection area, 41: first cooler, 42: second cooler, 43: second heat conduction member, 44: first heat conduction member, 45: heat sink, 46: connection member, 461: first connection piece, 462: second connection piece, 463: third connection piece, 464: fourth connection piece DETAILED DESCRIPTION OF THE INVENTION

[0024] The embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the drawings. The same or similar elements, or elements having the same or similar functions, are designated by the same or similar reference numerals throughout the description. The embodiments described below with reference to the drawings are examples and are used only to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0025] A battery pack 1000 according to one embodiment of the present disclosure will now be described with reference to the drawings.

[0026] 1 to 18, the present disclosure provides a battery pack 1000. The battery pack 1000 includes a cell 2 and a heat transfer member.

[0027] Specifically, the cell 2 includes a housing 21, a cell core 22, and a plurality of poles 33. An accommodation space is defined within the housing 21. The cell core 22 is disposed within the accommodation space. The housing 21 has at least a first surface 213 and a second surface 214. Each of the poles 33 is disposed on the cell core 22 and extends from the first surface 213 to an exterior of the housing 21. At least one of the poles 33 has a sheet-like structure. The heat transfer member is configured to transfer heat on the cell 2 adjacent to the first surface 213 to the second surface 214.

[0028] In other words, as shown in FIG. 1 , the battery pack 1000 in this embodiment of the present disclosure is mainly composed of a cell 2 and a heat transfer member. The cell 2 is mainly composed of a housing 21, a cell core 22, and a plurality of poles 33. The housing 21 has an accommodation space. The accommodation space may serve as an accommodation space. The cell core 22 may be accommodated within the accommodation space. The outer surface of the housing 21 may include at least a first surface 213 and a second surface 214. Each of the poles 33 is disposed on the cell core 22. Specifically, the poles 33 may extend from the first surface 213 to the outside of the housing 21 to achieve pole 33 extraction.

[0029] At least two poles 33 are arranged. When two poles 33 are arranged, one pole 33 may be used as a positive pole 31, and the other pole 33 may be used as a negative pole 32. For ease of explanation, the positive pole 31 and the negative pole 32 may be defined as forming a pole group. In the case of a pole group, the positive pole 31 and the negative pole 32 may be arranged on the same first surface 213, or the positive pole 31 and the negative pole 32 may be arranged on different first surfaces 213, but this is not limited herein. When multiple pole groups are arranged, the multiple pole groups may be located on the same side or different sides of the housing 21, but this is also not limited herein. In other words, as long as a pole 33 is arranged on the first surface 213, that pole falls within the scope of protection of the present disclosure.

[0030] It should be noted that, as shown in FIGS. 1 to 17, at least one electrode 33 is a sheet-like structural member. At least some or all of the electrodes 33 may have a sheet-like structure, but this is not limited to this specification. For example, the cell core 22 includes at least one cell core body 221 and a current collector 222 connected to the corresponding cell core body 221. Each cell core body 221 may include a positive electrode plate, a separator, and a negative electrode plate. The current collectors 222 corresponding to each cell core body 221 may be classified as a positive electrode current collector and a negative electrode current collector. The positive electrode current collector is connected to the positive electrode plate. The negative electrode current collector is connected to the negative electrode plate. The positive electrode current collector is connected to the positive electrode 31. The negative electrode current collector is connected to the negative electrode 32. The electrode group 3 includes, but is not limited to, the following cases. Case I: In electrode group 3, only the positive electrode 31 is a sheet-like electrode 33. Case II: In the electrode group 3, only the negative electrode 32 is a sheet-like electrode 33. Case III: In the electrode group 3, both the positive electrode 31 and the negative electrode 32 are sheet-like electrodes 33.

[0031] Optionally, the pole 33 may include a first connection area 331 and a second connection area 332. The first connection area 331 may be configured to connect to the current collector 222. The second connection area 332 may be connected to the first connection area 331. The second connection area 332 may be configured to connect to an external power-consuming device. The first connection area 331 and / or the second connection area 332 may have a sheet-like structure.

[0032] In other words, the first connection section 331 is connected to the second connection section 332. The first connection section 331 may be configured to connect to the current collector 222, for example, to the positive or negative current collector. It should be noted that the tab of the cell core 22 in the present disclosure may be a composite of a positive foil and a negative foil. The current collector 222 may be a structure formed by welding the tab. In this case, the current collector 222 and the tab may be two different states of the same material. It should be noted that the tab and the current collector fall within the scope of protection of the present disclosure, regardless of whether the tab and the current collector 222 are arranged separately or belong to the same structure.

[0033] A first end of the second connection section 332 is connected to the first connection section 331. A second end of the second connection section 332 is configured to connect to an external power consumption device. For example, the second connection section 332 is located to the left of the first connection section 331. The right end of the first connection section 331 may be connected to a positive electrode current collector or a negative electrode current collector. The left end of the first connection section 331 may be connected to the right end of the second connection section 332. The left end of the second connection section 332 may be connected to an external power consumption device.

[0034] In addition, at least one of the first connection region 331 and the second connection region 332 has a sheet-like structure. In other words, the pole 33 includes the following cases: Case I: Only the first connection region 331 has a sheet-like structure. Case II: Only the second connection region 332 has a sheet-like structure. Case III: Both the first connection region 331 and the second connection region 332 have a sheet-like structure.

[0035] In the related art, conventional poles are cylindrical elements. Conventional poles are positioned at the ends of the cell cores, and the diameter of the cylindrical elements must be smaller than the thickness of the cell cores. However, the surface area of the cylindrical elements is related to the diameter. Therefore, cylindrical elements have a relatively small surface area. In contrast, at least a portion of the poles 33 in the present disclosure have a sheet-like structure. The sheet-like structure has a relatively small thickness, and the sheet-like structure may have different sizes in multiple directions. For example, even if the thickness of the sheet-like structure is smaller than the thickness of the cell core 22, the sheet-like structure may increase the total area of the poles 33 by expanding its size in other directions. For example, if the thickness direction of the sheet-like structure is the front-to-rear direction, the sheet-like structure may expand its size in the length and height directions. When at least the first connection section 331 adopts a sheet-like structure, not only can the area of the poles 33 be increased, but the overcurrent area of the current collector 222 can also be increased. In the related art, poles are drawn out through connection sheets, and conventional connection sheets are designed to generate significant heat due to their limited overcurrent area. However, in this embodiment, a sheet-like structure is adopted to increase the area of the electrode 33, which can improve the heat dissipation effect. By increasing the overcurrent area, the degree of heat generation can be reduced, thereby solving the technical problem of limited fast charging capability of batteries with conventional electrodes in the related art.

[0036] In other words, when the electrode 33 in this embodiment adopts a sheet-like structure, not only can the area of the electrode 33 be increased, but also the overcurrent area of the current collector 222 can be increased. Increasing the area of the electrode 33 facilitates rapid heat dissipation from the electrode 33. Increasing the overcurrent area reduces the amount of heat generated, thereby helping to improve the charging efficiency of the cell 2, improving the rapid charging capability of the cell 2, and realizing rapid charging of the battery pack 1000. The battery pack 1000 may provide power to a vehicle or the like, or may be used as a power battery.

[0037] The battery pack 1000 in the present disclosure further includes a heat transfer member that transfers heat from the cells 2 adjacent to the first surface 213 to a position close to the position of the second surface 214. In other words, the heat transfer member can transfer heat near the poles 33 to another position, thereby achieving rapid dissipation of heat from the position close to the poles 33.

[0038] Based on the above, according to the battery pack 1000 in this embodiment of the present disclosure, not only is the overcurrent area increased by the sheet-shaped electrode 33, but the heat transfer member also achieves rapid heat dissipation near the electrode 33, thereby achieving rapid charging of the battery pack 1000.

[0039] Optionally, the pole 33 is formed as one piece. For example, the pole 33 produced by an integral forming process, such as stamping, may simultaneously include the first connection section 331 and the second connection section 332. In this embodiment, the integrally formed pole 33 is employed for ease of processing and manufacturing. For example, the step of connecting the first connection section 331 and the second connection section 332 may be omitted.

[0040] In some specific implementations of the present disclosure, as shown in Figures 2 and 3, the pole 33 is a rectangular member. For example, the first connection section 331 and the second connection section 332 may be combined to form a rectangular member. The rectangular member is a plate-shaped member. For example, the first connection section 331 and the second connection section 332 may extend along the same plane. The first connection section 331 is located to the left of the second connection section 332. The first connection section 331 and the second connection section 332 each extend along the horizontal direction and are located on the same horizontal plane.

[0041] In this embodiment, the electrode 33 is adopted with a rectangular structure to help the electrode 33 connect to the current collector 222 and an external power-consuming device. For example, the side of the rectangular member is connected to the current collector 222 to ensure a sufficient overcurrent area. In addition, the rectangular member helps to simultaneously increase the area of the electrode 33 and the overcurrent area of the current collector 222, thereby further improving the fast charging capability of the cell 2.

[0042] Additionally, when the pole 33 is a rectangular member, the distance between the two sides of the pole 33 along its thickness is uniform. For example, the length of the pole 33 extends horizontally, and the thickness extends vertically. The distance between the top and bottom surfaces of the pole 33 is the same for multiple positions on the pole 33. In this embodiment, a sheet-like pole 33 having a uniform thickness is employed to help improve processing efficiency.

[0043] According to one embodiment of the present disclosure, the housing 21 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. The second direction and the third direction define a third plane. The first surface 213 is connected to the second surface 214. The first surface 213 is parallel to the third plane. The second surface 214 is parallel to the second plane.

[0044] In other words, the housing 21 extends in a first direction, a second direction, and a third direction, i.e., has a first edge, a second edge, and a third edge. The first edge extends along the first direction, the second edge extends along the second direction, and the third edge extends along the third direction. The first plane may be defined by the first direction and the second direction. The second plane may be defined by the first direction and the third direction. The third plane may be defined by the second direction and the third direction. For example, the first direction is the x-axis direction, the third direction is the y-axis direction, and the second direction is the z-axis direction. In this case, the first plane is the x-z plane, the second plane is the x-y plane, and the third plane is the y-z plane. In this case, the housing 21 may be a cube. The first direction may be the lengthwise direction, the second direction may be the up-down direction, and the third direction may be the front-to-back direction.

[0045] In other words, as shown in Figures 1, 3, and 5 to 10, the size of the cell core 22 in the first direction is larger than the size in the second direction. The pole group 3 is arranged at the end of the cell core body 221 in the first direction. For example, the cell core 22 has an existing cell core structure and has a rectangular parallelepiped appearance. The length direction of the cell core 22 is parallel to the first direction. The height direction of the cell core 22 is parallel to the second direction. The thickness direction of the cell core 22 is parallel to the third direction. In this embodiment, one or more pole groups 3 may be arranged in one cell core body 221. All of the pole groups 3 are arranged at the ends of the cell core body 221 in the first direction. It should be noted that when multiple pole groups 3 are arranged, this embodiment also includes a case where one pole group 3 is at one end of the cell core body 221 in the first direction and another pole group 3 is at the other end of the cell core body 221 in the first direction. This embodiment also includes a case where multiple pole groups 3 are simultaneously located at the same end of the cell core body 221 in the first direction. In addition, this embodiment also includes a case where multiple cell core bodies 221 are arranged and the pole groups 3 of each cell core body 221 are at the end of the corresponding cell core body 221 in the first direction. Details will not be described in this specification. In addition, this embodiment is not limited to whether the positive electrodes 31 and negative electrodes 32 corresponding to the pole groups 3 are at the same end of the cell core body 221 in the first direction. In other words, this embodiment also includes a case where the positive electrodes 31 and negative electrodes 32 of the pole groups 3 on the cell core body 221 are located on different sides of the cell core body 221. In addition, this embodiment also includes a case where the cell core body 221 has multiple pole groups 3, and the positive electrodes 31 of the multiple pole groups 3 are located on one side of the cell core body 221 and the negative electrodes 32 of the multiple pole groups 3 are located on another side of the cell core body 221, i.e., a case where the cell core body 221 has the same polarity on the same side in the first direction. This embodiment also includes a case where the cell core body 221 has multiple pole groups 3, and the cell core body 221 has different polarities on the same side in the first direction.

[0046] In other words, the pole group 3 is positioned on the end of the cell core body 221 in the first direction, i.e., on the first surface 213, which not only eliminates the need to reserve space outside the cell core body 221 in the second direction to extend the heat dissipation path, but also helps increase the maximum size range of the cell core body 221 in the second direction, thereby increasing the battery capacity.

[0047] In this embodiment, in order to avoid the heat loss effect near the pole 33 being affected by heat accumulation near the first surface 213, the heat transfer direction of the heat transfer member may be further restricted by restricting the relative positional relationship between the first surface 213 and the second surface 214.

[0048] In some specific implementations of the present disclosure, the surface area of the second surface 214 is larger than the surface area of the first surface 213. In other words, in this embodiment, the poles 33 are disposed on the first surface 213 with a smaller area, and heat near the first surface 213 is transferred to a position near the second surface 214 with a larger area via the heat transfer member, thereby increasing the heat dissipation area and further improving the heat dissipation effect.

[0049] For example, the housing 21 may include a side plate 211 and a cover plate 212. The side plate 211 defines an accommodation space configured to accommodate the cell core 22. The accommodation space may be closed by a cover plate 212. Mounting holes extending through each of the cover plates 212 are disposed. In the present disclosure, the poles 33 may pass through the mounting holes and be connected to the current collectors 222 on the ends of the cell core body 221. In this case, the first surface 213 is disposed on the cover plate 212. The first surface 213 may be used as an end surface. The side plate 211 has a second surface 214 and front and rear surfaces parallel to the first plane. The second surface 214 may be used as an upper or lower surface. In this case, at least a portion of the poles 33 has a sheet-like structure. Therefore, by fitting the poles 33 with the current collectors 222 and the cell core body 221, the poles 33 can be drawn out in sheet form through the end faces of the housing 21. The total number of sheet-shaped drawn poles 33 drawn out through the end faces may be, but is not limited to, one. In addition, when the areas of the front and rear side faces are larger than the area of the second face 214, the area of the second face 214 is larger than the area of the first face 213, and the shape of the housing 21 is substantially the same as the shape of the cell core body 221, the front and rear side faces may be defined as large faces, and the second face 214 may be defined as a small face.

[0050] Additionally, in cases where the poles 33 are located on the first side of the cell core body 221, the explosion-proof valve 1 may be designed on the second side or the third side of the cell core body 221. In this embodiment, the explosion-proof valve 1 is prevented from being disposed on the first side of the cell core body 221, thereby providing more space for the sheet-like poles 33 of the present disclosure and further increasing the area of the poles 33. It should be noted that a cooler may be disposed on the side of the explosion-proof valve 1 away from the cell core body 221. For example, the cooler may be disposed above the explosion-proof valve 1. Optionally, an escape structure may be disposed on the cooler to prevent blockage of the opening of the explosion-proof valve 1. The explosion-proof valve 1 may have an exhaust direction 11 as shown in FIG. 13. Specifically, gas is first exhausted upward and then diffused outward. In a conventional wound or stacked electrode cell structure, the electrodes, explosion-proof valve, liquid injection hole, etc. must be located on the side cover plate. Because the tabs and electrodes are limited by the height of the cover plate, they have a relatively small overcurrent area and high heat generation, resulting in limited rapid charging. However, in this embodiment, the explosion-proof valve 1 is prevented from being positioned on the first surface 213 along with the electrodes 33, thereby increasing the area of the sheet-like electrodes 33.

[0051] In addition, depending on the space in the second and third directions of the cell core body 221, the size of the explosion-proof valve 1 can be further increased and the number of explosion-proof valves 1 can be increased, thereby improving the system thermal safety of the battery pack 1000.

[0052] Furthermore, the explosion-proof valve 1 may be disposed on a small surface. The degree of expansion of the large surface is easily greater than that of the small surface. Therefore, the installation position of the explosion-proof valve 1 is limited to avoid compression of the large surface caused by disposing the explosion-proof valve 1 on the large surface, improving safety. In addition, when multiple cells 2 are arranged in the third direction, the second surfaces 214 of the cells 2 may be located on the same side. In this case, the installation positions of the explosion-proof valves 1 may be located on the same side, thereby improving the compactness of the structure and facilitating installation.

[0053] In some specific implementations of the present disclosure, as shown in Figures 3 and 5, the positive electrode 31 of the pole group 3 is arranged at one end of the cell core body 221 in the first direction, and the negative electrode 32 is arranged at the other end of the cell core body 221 in the first direction.

[0054] For example, the first direction extends in the left-right direction. When one electrode group 3 is arranged on the cell core body 221, the electrode group 3 includes a positive electrode 31 and a negative electrode 32. The positive electrode 31 is located at the left end of the cell core body 221, and the negative electrode 32 is located at the right end of the cell core body 221. In this way, a double-sided monopolar structure is formed. For example, the length direction of the cell core body 221 extends in the left-right direction. The positive electrode 31 is located at the left end of the cell core body 221, and the negative electrode 32 is located at the right end of the cell core body 221. The current direction in the cell core body 221 during charging is from left to right.

[0055] When multiple pole groups 3 are arranged on the cell core body 221, multiple corresponding positive electrodes 31 and multiple corresponding negative electrodes 32 are arranged. Each positive electrode 31 is located on the left side of the cell core body 221, and each negative electrode 32 is located on the right side of the cell core body 221. In other words, multiple positive electrodes 31 are simultaneously arranged on the left side of the cell core body 221, and multiple negative electrodes 32 are simultaneously arranged on the right side of the cell core body 221. For example, the length direction of the cell core body 221 extends in the left-right direction. Two pole groups 3 are arranged. For ease of explanation, the two pole groups 3 are divided into a first pole group and a second pole group. The positive electrodes 31 of the first pole group and the positive electrodes 31 of the second pole group are located on the left side of the cell core body 221. The negative electrodes 32 of the first pole group and the negative electrodes 32 of the second pole group are located on the right side of the cell core body 221. 4 and 7, the current direction in the cell core body 221 during charging is from left to right. It is understood that this embodiment includes cases where the cell core body 221 has different polarities on different sides in the first direction, and cases where the cell core body has the same polarity on the same side in the first direction.

[0056] In some specific implementations of the present disclosure, as shown in FIG. 5 , multiple pole groups 3 are arranged on the cell core body 221. The multiple pole groups 3 are arranged at intervals in the second direction. For example, the second direction of the cell core body 221 extends in the vertical direction, and the multiple pole groups 3 are arranged at intervals in the vertical direction. When two pole groups 3 are arranged, the positive electrodes 31 of the first pole group are located above the positive electrodes 31 of the second pole group, and the negative electrodes 32 of the first pole group are located above the negative electrodes 32 of the second pole group. It should be noted that in this embodiment, the multiple pole groups 3 may be located on the same or different sides of the cell core body 221 in the first direction, and this specification is not limited thereto. This embodiment includes cases where the cell core body 221 has the same polarity on the same side in the first direction and cases where the cell core body has different polarities on the same side in the first direction.

[0057] In some specific implementations of the present disclosure, the positive electrodes 31 and negative electrodes 32 of the pole group 3 are arranged at the same end of the cell core body 221 in the first direction. For example, the first direction of the cell core 22 is the left-right direction. The pole group 3 is arranged on the cell core body 221. The positive electrodes 31 and negative electrodes 32 of the pole group 3 are simultaneously located on the left or right side of the cell core body 221, depending on the position of the current collector 222. The positive electrodes 31 and negative electrodes 32 of the pole group 3 are arranged on the same side of the cell core body 221. This arrangement not only facilitates the concentrated arrangement of the poles 33, but also facilitates the continuous arrangement of multiple cell core bodies 221 along the first direction. For example, two cell core bodies 221 are arranged, each a first cell core body and a second cell core body. The first cell core body is located to the left of the second cell core body. The pole group 3 of the first cell core body is located on the leftmost side of the first cell core body. The pole group 3 of the second cell core body is located on the rightmost side of the second cell core body. This embodiment also includes cases where the cell core bodies 221 have different polarities on the same side in the first direction.

[0058] According to one embodiment of the present disclosure, two cell core bodies 221 are arranged as shown in FIG. 9 . The two cell core bodies 221 are continuously distributed in a first direction. At least one pole group 3 is arranged in each of the cell core bodies 221. In the first direction, the pole group 3 of one cell core body 221 is located at one end of the cell core 22, and the pole group 3 of the other cell core body 221 is located at the other end of the cell core. For ease of explanation, the two cell core bodies 221 are defined as a first cell core body and a second cell core body. The first cell core body and the second cell core body are continuously distributed in the first direction. The pole group 3 corresponding to the first cell core body may be located at the leftmost side of the first cell core body. The pole group 3 corresponding to the second cell core body may be located at the rightmost side of the second cell core body. In this case, the positive electrode 31 and negative electrode 32 of the pole group 3 of the first cell core body are arranged on the left side in the first direction of the first cell core body, and the positive electrode 31 and negative electrode 32 of the pole group 3 of the second cell core body are arranged on the right side in the first direction of the second cell core body.

[0059] Optionally, when two pole groups 3 are arranged as shown in FIG. 9, for ease of explanation, the two pole groups 3 are defined as a first pole group and a second pole group. The first pole group corresponds to the first cell core body. The second pole group corresponds to the second cell core body. The positive electrode 31 and the negative electrode 32 of the first pole group are located on the left side of the first cell core body. The positive electrode 31 and the negative electrode 32 of the second pole group are located on the right side of the second cell core body. As shown in FIG. 10, during charging, current is conducted within the cell core body in the following direction: In the case of the first cell core body, current is conducted from the positive electrode 31 of the first pole group on the left side, through the first cell core body, and back to the negative electrode 32 of the first pole group. In the case of the second cell core body, current is conducted from the positive pole 31 of the second pole group on the right side through the second cell core body and back to the negative pole 32 of the second pole group.

[0060] In the case of a structure in which the same side of the cell core body 221 has multiple sheet-shaped lead electrodes 33, it is understood that the positive electrode 31 and the negative electrode 32 may be designed to be on the same side or on different sides. In the case of a design in which the same polarity is on the same side, the electrodes may be flexibly arranged on the cover plate 212 according to the actually required size of the electrodes 33 and the height of the electrodes 33 that can be manufactured. In the case of a design in which different polarities are on the same side, not only can the overcurrent of the current collector 222 be increased, but the current direction can also be changed and the current conduction path can be shortened, thereby effectively reducing heat generation.

[0061] In some specific implementations of the present disclosure, the poles 33 are welded to the corresponding current collectors 222. The robustness of the connection between the pole group 3 and the corresponding current collectors 222 is improved by welding.

[0062] According to one embodiment of the present disclosure, as shown in Figure 2, the poles 33 are in surface contact with the corresponding current collectors 222. The relatively large contact area improves the overcurrent area.

[0063] In addition, as shown in Figure 18, the maximum length of the poles 33 may be defined as L1. The length of the cover plate 212 may be defined as L2. The gap between the poles 33 and the cover plate 212 may be defined as L3. The gap between two adjacent poles 33 may be defined as L4. The number of poles 33 may be defined as N. The following formula may exist between the parameters: L1 = (L2 - L3 * 2 - (N - 1) L4) / N. The number and size of the sheet-like poles 33 on the cover plate 212 may be designed according to the above formula.

[0064] According to one embodiment of the present disclosure, the heat transfer member includes a first heat conduction member 44. The first heat conduction member 44 is disposed on the first surface 213 and thermally connected to the pole 33. The first heat conduction member 44 extends toward the position where the second surface 214 is located to transfer heat from the pole 33 to the second surface 214. In other words, since the first heat conduction member 44 extends substantially toward the second surface 214 and is thermally connected to the pole 33, heat from a position on the first surface 213 close to the pole 33 to the second surface 214 can be transferred via the thermal connection between the pole 33 and the first heat conduction member 44. It should be noted that the heat transfer member in the present disclosure extracts heat near the first surface 213. Not only the heat of the pole 33 may be extracted, but also the heat of the current collector may be extracted. In other words, heat from the pole 33 and the vicinity of the pole 33 may be extracted.

[0065] In some specific implementations of the present disclosure, multiple cells 2 are arranged as shown in Fig. 12. The first thermal conduction member 44 is thermally connected to the poles 33 of two adjacently arranged cells 2. In other words, the first thermal conduction member 44 may be fitted to two cells 2 simultaneously. In other words, two adjacent cells 2 may share the first thermal conduction member 44, thereby improving the compactness of the structure.

[0066] Optionally, the multiple cells 2 are arranged consecutively along a third direction. The third direction may be the thickness direction of each cell 2. The first thermally conductive member 44 may be thermally connected to the poles 33 of two cells 2 arranged adjacently in the third direction. For example, two cells 2 are arranged in the third direction, a first cell and a second cell, respectively. The first cell has a first pole group, and the second cell has a second pole group. The poles 33 of the first pole group are located to the left of the first cell. The poles 33 of the second pole group are located to the left of the second cell. In addition, since the first cell and the second cell are arranged consecutively in the third direction, at least one pole 33 of the first cell and at least one pole 33 of the second cell are arranged adjacently in the third direction. A gap exists between the two poles. The first thermally conductive member 44 is located at the position of the gap. Heat conduction can be performed simultaneously on the poles 33 of two cells through the first heat conducting member 44. Optionally, in the second direction, the length of the first heat conducting member 44 can be equal to or longer than the length of the poles 33. When the length of the first heat conducting member is equal to the length of the poles 33, the heat dissipation effect of the poles 33 can be guaranteed. When the length of the first heat conducting member is longer than the length of the poles 33, the heat of the poles 33 is helped to be transferred over a wider area.

[0067] Furthermore, the first heat conducting member 44 is in surface contact with the pole 33, which can enhance the heat transfer effect.

[0068] 12 , the battery pack 1000 further includes a connecting member 46. At least a portion of the connecting member 46 is located between the heat sink 45 and the pole 33 and is thermally connected to the heat sink 45 and the pole 33. The arrangement of the connecting member 46 solves the difficulty and low strength of attaching the heat sink and the pole 33. When the pole 33 is connected to the heat sink 45 via the connecting member 46, the heat sink 45 may be located outside the connecting member 46, and the pole 33 may be located inside the connecting member 46.

[0069] According to an embodiment of the present disclosure, the heat transfer member further includes a first connection piece 461, a second connection piece 462, and a third connection piece 463 that are continuously connected. In other words, the connection member 46 includes the first connection piece 461, the second connection piece 462, and the third connection piece 463. The first connection piece 461, the second connection piece 462, and the third connection piece 463 fit together to form a receiving groove. The connection member 46 includes the first connection piece 461, the second connection piece 462, and the third connection piece 463, and together they may form a member in the shape of the Chinese character "匚". The receiving groove is configured to receive the heat conduction member. The first connection piece 461 is connected to one of the electrodes 33 of one of the two cells 2. The second connection piece 462 is connected to the other electrode 33 of the two cells 2. The third connection piece 463 is located between the first connection piece 461 and the second connection piece 462 and is connected to the first connection piece 461 and the second connection piece 462.

[0070] In other words, as shown in FIGS. 14 to 16, the connection member 46 includes a first connection piece 461, a second connection piece 462, and a third connection piece 463. The first connection piece 461 is connected to one of the electrodes 33 of two cells 2 arranged adjacent to each other in the third direction. The second connection piece 462 is connected to the other electrode 33 of the two cells 2 arranged adjacent to each other in the third direction. The third connection piece 463 is connected to the first connection piece 461 and the second connection piece 462 and fits with the first connection piece and the second connection piece to form a receiving groove. The receiving groove is configured to receive the first heat conduction member 44. For example, the third direction is the front-rear direction. The first connection piece 461 and the second connection piece 462 may be arranged spaced apart in the front-rear direction. The third connection piece 463 may be located between the first connection piece 461 and the second connection piece 462. The rear end of the third connection piece 463 is connected to the first connection piece 461. The front end of the third connection piece 463 is connected to the second connection piece 462. The first heat conduction member 44 is located between the first connection piece 461 and the second connection piece 462 and is thermally connected to the first connection piece 461, the second connection piece 462, and the third connection piece 463. In addition, the third connection piece 463 is thermally connected to the heat sink 45.

[0071] According to one embodiment of the present disclosure, the heat transfer member further includes a fourth connection piece 464. The fourth connection piece 464 is disposed at an end of the third connection piece 463 proximate to the second surface 214. The fourth connection piece 464 is thermally connected to the heat transfer member and the second surface 214.

[0072] In other words, as shown in FIGS. 14 to 16 , the connecting member 46 further includes a fourth connecting piece 464. The fourth connecting piece 464, the first connecting piece 461, and the second connecting piece 462 are located on the same side of the third connecting piece 463. The fourth connecting piece 464 is located at at least one end of the third connecting piece 463 in the second direction. The fourth connecting piece 464 may limit the first thermal conduction member 44. Optionally, two fourth connecting pieces 464 are located. One fourth connecting piece 464 is located at the upper end of the third connecting piece 463, and the other fourth connecting piece 464 is located at the lower end of the third connecting piece 463. It can be seen that the outer periphery of the first thermal conduction member 44 can conduct heat in multiple directions via the first connecting piece 461, the second connecting piece 462, the third connecting piece 463, and the fourth connecting piece 464, resulting in timely and efficient transfer of heat to the heat sink 45. For example, the fourth connection piece 463 is thermally connected to a cooler.

[0073] In some specific implementations 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 opposite the first surface 213 and configured to exchange heat with the poles 33.

[0074] In other words, the heat dissipation assembly includes a heat sink 45. The heat sink 45 is located on a side of the pole 33 away from the cell core body 221 in the first direction, and is thermally connected to the pole 33. In other words, by designing the heat sink 45 outside the pole 33, the degree of temperature rise of the pole 33 can be reduced.

[0075] According to one embodiment of the present disclosure, the heat sink 45 includes at least one tubular member. The tubular member has a first flow path for a cooling fluid to flow through. A portion of the tubular member is formed as at least a portion of the heat transfer member. The tubular member is configured to have a relatively long length, which supports one tubular member being able to accommodate multiple poles 33 or even multiple cells 2. For example, a portion of the tubular member extends in a third direction. Multiple cells 2 are also arranged continuously in the third direction. In this manner, the tubular member can accommodate the poles 33 of multiple cells 2. In this embodiment, the tubular member is employed as at least a portion of the heat sink 45, which not only facilitates control by the extension direction of the tubular member (especially when the tubular member functions as at least a portion of the heat transfer member), but also achieves heat extraction at a position close to the poles 33 through the extension direction of the tubular member. Furthermore, one tubular member corresponds to multiple poles 33, which supports a compact structure and improved component utilization. In addition, since the tubular member has a first flow path, a cooling fluid is injected into the first flow path, and heat exchange between the poles 33 and the heat sink 45 can be achieved through the fluid having a temperature difference.

[0076] Optionally, multiple tubular members are arranged. For example, four tubular members are arranged. The four tubular members are arranged consecutively in the second direction. A portion of each of the tubular members may be arranged on the opposite side of the first surface 213. Every two tubular members may form a one-in, one-out circuit. In this embodiment, multiple tubular members are employed to help increase the amount of heat extraction and the temperature control range.

[0077] In some specific implementations of the present disclosure, the battery pack 1000 further includes a cooler. The cooler is thermally connected to the second surface 214. The cooler is disposed near the second surface 214, so that heat near the second surface 214 can be extracted and heat exchange of heat accumulated near the second surface 214 can be achieved through the cooler. In addition, the cooler can also perform heat exchange with the heat of the second surface 214. In other words, the cooler is disposed near the second surface 214, and is coupled with the cooler through a heat transfer member to not only perform temperature control at positions near the first surface 213, particularly near the poles 33, so as to achieve timely heat dissipation near the poles 33, but also perform heat dissipation on the second surface 214 to achieve temperature control at multiple positions on the housing 21.

[0078] According to one embodiment of the present disclosure, a second flow path for a cooling fluid is provided in the cooler. The cooler is thermally connected to the heat transfer member. In other words, the second flow path is provided in the cooler. The cooling fluid is filled in the second flow path. A temperature difference exists between the cooling fluid and the vicinity of the second surface 214, and the cooling fluid may further be fitted with a fluid inlet and a fluid outlet to achieve fluid flow so as to achieve rapid heat exchange near the second surface 214.

[0079] In addition, a second flow path is provided in the cooler. The first flow path is disposed in the heat sink 45. The second flow path is in communication with the first flow path. In this case, the cooler may be used as a liquid cooling plate. The flow path is disposed in the heat sink 45, and communication between the heat sink 45 and the cooler is achieved, thereby improving the heat dissipation effect at a position close to the pole 33.

[0080] In one embodiment of the present disclosure, two coolers are arranged. The cell 2 is located between the two coolers. In other words, one cooler is located on one side of the cell 2 and corresponds to one second surface 214, and the other cooler is located on another side of the cell 2 and corresponds to another second surface 214. It should be noted that one second surface 214 may correspond to one or more coolers. For example, two coolers are located on the upper side of the cell 2 and one cooler is located on the lower side of the cell 2. In other words, regardless of whether one or more coolers correspond to the side surfaces of the cell 2, as long as at least one cooler is arranged on two sides of the cell 2, it falls within the scope of protection of the present disclosure.

[0081] For example, as shown in FIG. 11 , the heat dissipation assembly includes two coolers. For ease of explanation, the two coolers are defined as a first cooler 41 and a second cooler 42. The first cooler 41 is disposed at one end of the cell 2 in the second direction, and the second cooler 42 is disposed at the other end of the cell 2 in the second direction. When the first direction extends substantially horizontally and the second direction extends substantially vertically, the first cooler 41 may be located above the cell 2, and the second cooler 42 may be located below the cell 2. The first cooler 41 can conduct heat to the upper part of the cell 2. The second cooler 42 can conduct heat to the lower part of the cell 2.

[0082] In this embodiment, the first cooler 41 is fitted with the second cooler 42, forming a double-sided cooling sandwich structure on the cell 2, thereby reducing the temperature difference in the height direction of the cell 2. However, battery packs in related art employ conventional top or bottom single-sided cooling during faster charging, which causes a large temperature difference in the height direction of the cell. In addition, in this embodiment, the first cooler 41 and the second cooler 42 are arranged outside the cell 2 in the second direction to achieve heat dissipation in the second direction, and heat dissipation in the first direction is achieved through the sheet-like pole 33 in the first direction. In addition, heat near the pole 33 can be drawn to the second surface 214 through the heat transfer member, thereby achieving multi-directional heat dissipation of the cell 2.

[0083] In some specific implementations of the present disclosure, as shown in FIG. 11 , the heat dissipation assembly further includes a second heat conduction member 43. The second heat conduction member 43 is thermally connected to the cells 2 and the cooler. In other words, heat exchange between the cells 2 and the cooler may be achieved by the second heat conduction member 43. In this embodiment, the second heat conduction member 43 is disposed, which not only avoids easy damage to the cells 2 caused by the cooler coming into direct contact with the cells 2, but also eliminates the need to design the cooler to be excessively large. In addition, when multiple cells 2 are disposed, one second heat conduction member 43 may correspond to multiple cells 2.

[0084] According to one embodiment of the present disclosure, as shown in FIG. 11 , the cooler and the second heat conducting member 43 each have a sheet-like structure. The second heat conducting member 43 is in contact with the cooler and the cell 2. For example, the upper end surface of the second heat conducting member 43 is in contact with the lower end surface of the cooler. The lower end surface of the second heat conducting member 43 is in contact with the upper end surface of the cell 2. The surface contact method increases the heat conduction area and improves the balance of force and heat dissipation at multiple positions on the cell 2. When multiple cells 2 are arranged, the balance of force and heat dissipation among the multiple cells 2 is improved.

[0085] According to one embodiment of the present disclosure, the battery pack 1000 further includes a tray. A receiving space is defined within the tray. The cells 2 are located within the receiving space. A heat transfer member, a heat sink 45, a cooler, and the like may also be located within the receiving space. As shown in FIGS. 11 and 12 , the heat sink 45 and the cooler are thermally connected to different positions on the cells 2, respectively. Heat near the first surface 213 can be drawn away in a timely manner by the heat transfer member, thereby improving heat dissipation efficiency and helping to achieve rapid charging.

[0086] According to one embodiment of the present disclosure, at least one end of the receiving space is open along its axial direction. The coolers are used as the bottom or top plates of the tray. For example, the first cooler 41 is used as the top plate of the tray, and the second cooler 42 is used as the bottom plate of the tray, which can improve the heat dissipation effect and also avoid excessive height occupation space caused by the simultaneous presence of the top plate, bottom plate, first cooler 41, and second cooler 42 in the vertical direction.

[0087] According to one embodiment of the present disclosure, the pole 33 is parallel to the third plane. For example, the length of the pole 33 extends in the second direction, and the height of the pole 33 extends in the first direction. In other words, the pole 33 has a length and a height. The length of the pole 33 may be parallel to the second direction, and the height of the pole 33 may be parallel to the first direction. In this embodiment, the length and height of the pole 33 are limited, thereby helping the pole 33 to be connected to the current collector 222 and an external power consumption device. In addition, the pole 33 is parallel to the third plane, which helps increase the contact area between the pole 33 and the first heat conduction member 44 and improves the heat transfer efficiency between the pole 33 and the first heat conduction member 44.

[0088] According to one embodiment of the present disclosure, the connecting member 46 is welded to the pole 33. Welding can improve connection reliability. Furthermore, the side of the sheet-like pole 33 is in surface contact with the connecting member 46. For example, the length direction of the pole 33 extends in the vertical direction, and the height direction extends in the horizontal direction. The side of the pole 33 in the thickness direction of the cell core body 221 is in contact with the side of the connecting member 46, thereby increasing the welding bonding area between the pole 33 and the connecting member 46. Optionally, the connecting member 46 is bonded to the heat sink 45, which can improve assembly efficiency.

[0089] Furthermore, the first heat conducting member 44 is thermally connected to the current collector 222 corresponding to the electrode 33, thereby improving the heat dissipation effect of the current collector 222.

[0090] Optionally, in the second direction, at least one end of the connection member 46 is thermally connected to the cooler. The first thermal conduction member 44 may be made of a highly thermally conductive material. When the first thermal conduction member 44 is disposed between the cover plate 212 and the connection member 46, the third connection piece 463 can guide heat upward and / or downward along the cover plate 212 to the cooler, thereby increasing the amount of heat dissipation. The overall heat of the electrodes 33 and the current collectors 222 can be removed by the connection member 46, thereby improving fast charging capability. Specifically, heat dissipation paths include, but are not limited to, the following:

[0091] Heat dissipation path I: current collector 222 → first heat conducting member 44 → connection member 46 → second heat conducting member 43 → cooler.

[0092] Heat dissipation path II: current collector 222 → first heat conduction member 44 → connection member 46 → heat sink 45.

[0093] In other words, the electrodes 33, cells 2, and battery pack 1000 according to the present disclosure employ a novel sheet-shaped electrode 33 structure design mated with a heat transfer member with a high heat dissipation path, thereby improving high-rate fast charging capability. Unlike conventional cell cores with positive and negative electrodes on their sides, the present disclosure employs a sheet-shaped lead-out electrode 33, which effectively utilizes the space of the cover plate 212, improves the heat dissipation area of the current collector 222, and enhances the overcurrent capability of the cell core 22. Additionally, the design of the heat transfer member is combined with the design of a cooler and a heat sink. For example, coolers are positioned on two sides, the connecting member 46 is mated with a heat sink 45, and a first heat conduction member 44 is added between the connecting member 46 and the cover plate 212 to eliminate temperature rise in the electrodes 33, etc., thereby improving the overall fast charging capability of the power battery.

[0094] The present disclosure further provides a vehicle. The vehicle includes the battery pack 1000 according to any of the above embodiments. The battery pack 1000 has a desirable heat dissipation effect that improves fast charging capability, so the vehicle in the present disclosure further has the advantage of high fast charging capability. Details will not be described herein.

[0095] Although several specific embodiments of the present disclosure have been described in detail by way of 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 the present disclosure. Those skilled in the art should understand that changes may 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.

Claims

1. A cell (2), the cell (2) comprising a housing (21), a cell core (22), and a plurality of poles (33), wherein an accommodation space is defined within the housing (21), the cell core (22) is disposed within the accommodation space, the housing (21) has at least a first surface (213) and a second surface (214), each of the poles (33) is disposed on the cell core (22) and extends from the first surface (213) to the outside of the housing (21), and at least one of the poles (33) is a sheet-like structure; a heat transfer member configured to transfer heat on the cells (2) adjacent to the first surface (213) to the second surface (214); A battery pack (1000) comprising:

2. the housing (21) 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; 2. The battery pack (1000) of claim 1, wherein the first surface (213) is connected to the second surface (214), the first surface (213) is parallel to the third plane, and the second surface (214) is parallel to the second plane.

3. The battery pack (1000) according to claim 1 or 2, wherein the surface area of the second surface (214) is greater than the surface area of the first surface (213).

4. The battery pack (1000) according to any one of claims 1 to 3, wherein the heat transfer member comprises a heat conductive member, the heat conductive member is disposed on the first surface (213) and thermally connected to the pole (33), and the heat conductive member extends toward a position where the second surface (214) is located, and transfers heat from the pole (33) to the second surface (214).

5. A battery pack (1000) according to any one of claims 1 to 4, wherein a plurality of cells (2) are arranged, and the heat conduction member is thermally connected to the poles (33) of each of two cells (2) arranged adjacent to each other.

6. 6. The battery pack (1000) according to claim 1, wherein the heat transfer member further comprises a first connection piece (461), a second connection piece (462), and a third connection piece (463) connected in series, the first connection piece (461), the second connection piece (462), and the third connection piece (463) fitting together to form an accommodating groove, the accommodating groove being configured to accommodate the heat transfer member, the first connection piece (461) being connected to the pole (33) of one of the two cells (2), the second connection piece (462) being connected to the pole (33) of the other of the two cells (2), and the third connection piece (463) being located between the first connection piece (461) and the second connection piece (462) and being connected to the first connection piece (461) and the second connection piece (462).

7. The battery pack (1000) of any one of claims 1 to 6, wherein the heat transfer member further comprises a fourth connection piece (464), the fourth connection piece (464) being disposed at an end of the third connection piece (463) proximate to the second surface (214), and the fourth connection piece (464) being thermally connected to the heat transfer member and the second surface (214).

8. The battery pack (1000) according to any one of claims 1 to 7, further comprising a heat sink (45), at least a portion of which is arranged on the opposite side to the first surface (213) and configured to exchange heat with the poles (33).

9. The battery pack (1000) according to any one of claims 1 to 8, wherein the heat sink (45) comprises at least one tubular member, the tubular member having a first flow path for a cooling fluid to flow, and a portion of the tubular member being formed as at least a portion of the heat transfer member.

10. The battery pack (1000) according to any one of claims 1 to 9, further comprising a cooler thermally connected to the second surface (214).

11. A battery pack (1000) according to any one of claims 1 to 10, wherein a second flow path for the cooling fluid to flow is provided within the cooler, and the cooler is thermally connected to the heat transfer member.

12. The battery pack (1000) according to any one of claims 1 to 11, wherein two coolers are arranged and the cell (2) is located between the two coolers.

13. The battery pack (1000) according to any one of claims 1 to 12, wherein the poles (33) are parallel to the third plane.

14. A vehicle comprising the battery pack (1000) according to any one of claims 1 to 13.

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