Battery packs and vehicles.

Abstract

DEPCT68 Vehicles with battery packs: A battery pack consists of single-cell batteries and... The heat transfer element of a single-cell battery consists of a cell housing and multiple electrodes. The supporting void space is defined in the housing, and the cells are placed within the supporting void space of the housing. At least one primary and two secondary polar surfaces are positioned on the cell and extend outwards from the housing. The first surface, and at least one at the pole, is shaped into a plate, a transfer element. Heat can be transferred from a single battery cell near one surface to a second surface;

Description

Battery packs and vehicles

[0001] This disclosure claims priority to a Chinese patent application filed with the Patent Office of China on August 19, 2022, with application number 2022110013407 and application name “Battery Pack and Vehicle,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of batteries, and in particular, to battery packs and vehicles. Background Art

[0003] In related technologies, power battery systems generate a lot of heat during fast charging and have poor heat dissipation capabilities, which limits the fast charging capabilities of conventional power battery systems.

[0004] Summary of the Invention

[0005] One purpose of the present disclosure is to provide a battery pack that can solve the technical problem in the prior art that the heat dissipation effect of the battery pack is poor, resulting in limited fast charging capability.

[0006] According to a first aspect of the present disclosure, a battery pack is provided, comprising: a single battery, wherein the single battery comprises a shell, a battery cell and a plurality of poles, wherein a accommodating space is defined within the shell, the battery cell is arranged in the accommodating space, the shell has at least a first surface and a second surface, the poles are arranged in the battery cell and extend from the first surface to the shell, and at least one of the poles is a sheet-like body; and a heat transfer element, wherein the heat transfer element can transfer heat on the single battery close to the first surface to the second surface.

[0007] According to an embodiment of the present disclosure, the shell 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 is connected to the second surface, and the first surface is parallel to the third plane, and the second surface is parallel to the second plane.

[0008] According to an embodiment of the present disclosure, the surface area of ​​the second surface is greater than the surface area of ​​the first surface.

[0009] According to an embodiment of the present disclosure, the heat transfer member includes: a heat conductor, which is arranged on the first surface and thermally connected to the pole, and extends toward the location of the second surface to transfer the heat of the pole to the second surface.

[0010] According to an embodiment of the present disclosure, there are a plurality of single battery cells, and the heat conducting members are respectively connected to the poles of two adjacently arranged single battery cells in a heat-conducting manner.

[0011] According to an embodiment of the present disclosure, the heat transfer member also includes a first connection part, a second connection part and a third connection part connected in sequence, the first connection part, the second connection part and the third connection part cooperate to form a receiving groove, the receiving groove is used to accommodate the heat conductive member, the first connection part is connected to the pole of one of the two single cells, the second connection part is connected to the pole of the other of the two single cells, and the third connection part is located between the first connection part and the second connection part and is respectively connected to the first connection part and the second connection part.

[0012] According to an embodiment of the present disclosure, the heat transfer member further includes a fourth connection portion, which is provided at an end of the third connection portion close to the second surface, and is thermally connected to the heat conducting member and the second surface respectively.

[0013] According to an embodiment of the present disclosure, the battery pack further includes: a radiator, at least a portion of which is disposed opposite to the first surface and capable of heat exchange with the pole.

[0014] According to an embodiment of the present disclosure, the radiator includes at least one tubular member having a first fluid channel therein for cooling fluid to flow, and a portion of the tubular member forms at least a portion of the heat transfer element.

[0015] According to an embodiment of the present disclosure, the battery pack further includes: a cooler, which is thermally conductively connected to the second surface.

[0016] According to an embodiment of the present disclosure, a second fluid channel is provided in the cooler for the flow of cooling fluid, and the cooler is thermally connected to the heat transfer element.

[0017] According to an embodiment of the present disclosure, there are two coolers, and the single battery is located between the two coolers.

[0018] According to an embodiment of the present disclosure, the pole is parallel to the third plane.

[0019] According to a second aspect of the present disclosure, a vehicle is provided, comprising the battery pack according to any one of the above embodiments.

[0020] According to one embodiment of the present disclosure, on the one hand, the flow area is increased by adopting a sheet-shaped pole, and on the other hand, a heat transfer element is adopted to achieve rapid heat dissipation near the first surface, especially at the location of the pole, thereby achieving the purpose of rapid charging of the battery pack.

[0021] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] FIG1 is a partial exploded view of a single cell according to an embodiment of the present disclosure;

[0024] FIG2 is a schematic diagram of the assembly of a pole and a current collector according to an embodiment of the present disclosure;

[0025] FIG3 is a schematic structural diagram of a single cell according to an embodiment of the present disclosure;

[0026] FIG4 is a schematic diagram of current flow in the single cell in FIG3 ;

[0027] FIG5 is a schematic structural diagram of a single cell according to an embodiment of the present disclosure from one angle;

[0028] FIG6 is a schematic structural diagram of a single cell according to an embodiment of the present disclosure from another angle;

[0029] FIG7 is a schematic diagram of current flow in the single battery cells in FIG5 and FIG6;

[0030] FIG8 is a schematic structural diagram of a single cell according to an embodiment of the present disclosure from one angle;

[0031] FIG9 is a schematic structural diagram of a single cell according to an embodiment of the present disclosure from another angle;

[0032] FIG10 is a schematic diagram of current flow in the single battery cells in FIG8 and FIG9;

[0033] FIG11 is a schematic diagram of the assembly of a single battery and a heat dissipation assembly according to an embodiment of the present disclosure;

[0034] FIG12 is a partial exploded view of a battery pack according to another embodiment of the present disclosure;

[0035] FIG13 is a schematic diagram of the assembly of a single battery and an explosion-proof valve according to an embodiment of the present disclosure;

[0036] FIG14 is a schematic structural diagram of a connector according to an embodiment of the present disclosure at an angle;

[0037] FIG15 is a structural schematic diagram of a connecting member according to an embodiment of the present disclosure from another angle;

[0038] FIG16 is a schematic diagram of the cooperation between a second heat conducting member and two single cells according to an embodiment of the present disclosure;

[0039] FIG17 is an enlarged view of the circled area A in FIG16 ;

[0040] FIG18 is a schematic diagram of the assembly of a pole and a cover plate according to an embodiment of the present disclosure.

[0041] Reference numerals

[0042] Battery pack 1000;

[0043] Explosion-proof valve 1; exhaust direction 11;

[0044] Single cell 2; housing 21; side plate 211; cover plate 212; first surface 213; second surface 214; battery cell 22; battery cell body 221; current collector 222;

[0045] Pole group 3; positive pole 31; negative pole 32; pole 33; first connecting section 331; second connecting section 332;

[0046] a first cooler 41 ; a second cooler 42 ; a second heat conducting member 43 ; a first heat conducting member 44 ; a heat sink 45 ; a connecting member 46 ; a first connecting portion 461 ; a second connecting portion 462 ; a third connecting portion 463 ; and a fourth connecting portion 464 . DETAILED DESCRIPTION

[0047] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present disclosure and are not to be construed as limiting the present disclosure.

[0048] The battery pack 1000 according to an embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0049] As shown in FIG. 1 to FIG. 18 , the present disclosure provides a battery pack 1000 , which includes single cells 2 and a heat transfer element.

[0050] Specifically, the single battery 2 includes a shell 21, a battery cell 22 and a plurality of poles 33. The shell 21 defines a storage space, and the battery cell 22 is arranged in the storage space. The shell 21 has at least a first surface 213 and a second surface 214. The poles 33 are arranged in the battery cell 22 and extend out of the shell 21 from the first surface 213. At least one pole 33 is a sheet-like body, and the heat transfer element can transfer the heat on the single battery 2 near the first surface 213 to the second surface 214.

[0051] In other words, as shown in Figure 1, the battery pack 1000 of the present embodiment is primarily composed of a single battery cell 2 and a heat transfer element. The single battery cell 2 primarily comprises a housing 21, a battery cell 22, and a plurality of terminals 33. The housing 21 has a storage space that accommodates the battery cell 22. The outer surface of the housing 21 may include at least a first surface 213 and a second surface 214. The battery cell 22 is provided with a terminal 33. Specifically, the terminal 33 may extend from the housing 21 through the first surface 213, thereby allowing the terminal 33 to be led out.

[0052] The number of poles 33 is at least two. When the number of poles 33 is two, one pole 33 can be used as a positive pole 31, and the other pole 33 can be used as a negative pole 32. For the sake of convenience, it can be defined that a positive pole 31 and a negative pole 32 constitute a pole group. For a pole group, the positive pole 31 and the negative pole 32 can be arranged on the same first surface 213, or the positive pole 31 and the negative pole 32 can be arranged on different first surfaces 213, which is not limited here. When the number of pole groups is multiple, the multiple pole groups can be located on the same side or different sides of the shell 21, which is not limited here. In other words, as long as the pole 33 is arranged on the first surface 213, it falls within the protection scope of the present disclosure.

[0053] It should be noted that, as shown in Figures 1 to 17, at least one electrode 33 is a sheet-like structure. This is not limited to at least a portion of the electrode 33 or the entire electrode 33. For example, the battery cell 22 includes at least one battery cell body 221 and a current collector 222 connected to the corresponding battery cell body 221. Each battery cell body 221 can include a positive electrode sheet, a separator, and a negative electrode sheet. The current collector 222 corresponding to each battery cell body 221 can be divided into a positive current collector and a negative current collector. The positive current collector is connected to the positive electrode sheet, and the negative current collector is connected to the negative electrode sheet. The positive current collector is connected to the positive electrode column 31, and the negative current collector is connected to the negative electrode column 32. Among them, the electrode group 3 includes but is not limited to the following situations: situation 1, only the positive electrode 31 in a electrode group 3 is a sheet-shaped electrode 33; situation 2, only the negative electrode 32 in a electrode group 3 is a sheet-shaped electrode 33; situation 3, both the positive electrode 31 and the negative electrode 32 in a electrode group 3 are sheet-shaped electrodes 33.

[0054] Optionally, the pole 33 may include a first connecting segment 331 and a second connecting segment 332, wherein the first connecting segment 331 can be used to connect to the current collector 222, the second connecting segment 332 can be connected to the first connecting segment 331, and the second connecting segment 332 can be used to connect to an external electrical device, wherein the first connecting segment 331 and / or the second connecting segment 332 is a sheet-like body.

[0055] That is, the first connecting segment 331 and the second connecting segment 332 are connected separately, and the first connecting segment 331 can be used to connect to the current collector 222, for example, to the positive electrode current collector or the negative electrode current collector. It should be noted that the tabs of the battery cell 22 of the present disclosure can be the confluence of the positive and negative electrode foils, and the current collector 222 can be a structure formed by welding the tabs. In this case, the current collector 222 and the tabs can be two different states of the same material. It should be noted that whether the tabs and the current collector 222 are provided separately or the tabs and the current collector 222 are of the same structure, they are all within the scope of protection of the present disclosure.

[0056] The first end of the second connecting segment 332 is connected to the first connecting segment 331, and the second end of the second connecting segment 332 is used to connect to an external electrical device. For example, the second connecting segment 332 is located on the left side of the first connecting segment 331. The right end of the first connecting segment 331 can be connected to the positive electrode current collector or the negative electrode current collector, and the left end of the first connecting segment 331 can be connected to the right end of the second connecting segment 332. The left end of the second connecting segment 332 can be connected to an external electrical device.

[0057] In addition, at least one of the first connecting section 331 and the second connecting section 332 is a sheet-like body, that is, the pole 33 includes the following situations: situation 1, only the first connecting section 331 is a sheet-like body; situation 2, only the second connecting section 332 is a sheet-like body; situation 3, both the first connecting section 331 and the second connecting section 332 are sheet-like bodies.

[0058] The conventional poles in the prior art are cylindrical and are located at the ends of the battery cells. The diameter of the cylindrical body needs to be smaller than the thickness of the battery cells, and the surface area of ​​the cylindrical body is related to its own diameter, so the surface area of ​​the cylindrical body is relatively small. In comparison, at least a portion of the pole 33 of the present disclosure is a sheet-like structure. The thickness of the sheet-like structure is relatively small, and the dimensions of the sheet-like structure in multiple directions can be different from each other. For example, even if the thickness of the sheet-like structure is smaller than the thickness of the battery cell 22, the sheet-like structure can increase the total area of ​​the pole 33 by expanding its dimensions in other directions. For example, when the thickness direction of the sheet-like structure is the front-to-back direction, the sheet-like structure can expand its dimensions in the length direction and the height direction. When at least the first connecting section 331 adopts a sheet-like structure, not only the area of ​​the pole 33 can be increased, but also the flow area of ​​the current collector 222 can be increased. The poles in the prior art are led out through connecting pieces, and conventional connecting piece designs will also cause severe heat generation due to the limited flow area. In this embodiment, by adopting a sheet structure, increasing the area of ​​the pole 33 can improve the heat dissipation effect, and by increasing the flow area, the degree of heat generation can be reduced, thereby solving the technical problem of limited fast charging capability of batteries with traditional poles in the prior art.

[0059] That is, when the terminal 33 of this embodiment adopts a sheet-like structure, it not only increases the area of ​​the terminal 33 but also increases the flow area of ​​the current collector 222. Increasing the area of ​​the terminal 33 facilitates rapid heat dissipation from the terminal 33, and increasing the flow area reduces heat generation, thereby improving the charging efficiency of the single battery 2 and the fast charging capability of the single battery 2, enabling fast charging of the battery pack 1000. The battery pack 1000 can provide power for vehicles and other applications, serving as a power battery.

[0060] The battery pack 1000 disclosed herein also includes a heat transfer component that transfers heat from a position near the first surface 213 on the single battery cell 2 to a position near the second surface 214. That is, the heat near the pole 33 can be transferred to other positions through the heat transfer component, thereby achieving rapid heat dissipation of the heat near the pole 33.

[0061] Therefore, the battery pack 1000 of the embodiment of the present disclosure, on the one hand, increases the flow area by adopting the sheet-shaped pole 33, and on the other hand, realizes the rapid heat dissipation near the pole 33 by adopting the heat transfer element, thereby achieving the purpose of rapid charging of the battery pack 1000.

[0062] Optionally, the pole 33 is an integrally formed part. For example, the pole 33 can be manufactured through an integral molding process, such as stamping, and includes both the first connecting section 331 and the second connecting section 332. In this embodiment, the integrally molded pole 33 facilitates processing and production. For example, the step of connecting the first connecting section 331 and the second connecting section 332 can be omitted.

[0063] In some specific embodiments of the present disclosure, as shown in Figures 2 and 3, the pole 33 is a rectangular member. For example, the first connecting segment 331 and the second connecting segment 332 can be combined to form a rectangular member, and the rectangular member is a plate-shaped member. For example, the first connecting segment 331 and the second connecting segment 332 can extend along the same plane, with the first connecting segment 331 located to the left of the second connecting segment 332. The first connecting segment 331 and the second connecting segment 332 can extend horizontally and be located on the same horizontal plane.

[0064] In this embodiment, the use of a rectangular terminal post 33 facilitates connection between the terminal post 33 and the current collector 222 and external electrical equipment. For example, one side of the rectangular member is connected to the current collector 222 to ensure a sufficiently large flow area. In addition, the use of a rectangular member facilitates increasing both the area of ​​the terminal post 33 and the flow area of ​​the current collector 222, thereby further improving the fast charging capability of the single cell 2.

[0065] Furthermore, when the pole 33 is a rectangular member, the spacing between the two side surfaces of the pole 33 along its thickness direction is uniform. For example, the length direction of the pole 33 extends horizontally, and the thickness direction extends vertically. The spacing between the upper and lower surfaces of the pole 33 is the same at multiple locations on the pole 33. In this embodiment, the use of a sheet-shaped pole 33 with a uniform thickness facilitates improved processing efficiency.

[0066] According to one embodiment of the present disclosure, the shell 21 has edges extending along the first direction, the second direction and the 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 213 is connected to the second surface 214, and the first surface 213 is parallel to the third plane, and the second surface 214 is parallel to the second plane.

[0067] That is to say, the shell 21 extends along the first direction, the second direction and the third direction respectively, that is, it has a first edge, a second edge and a third edge, wherein 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 can be defined by the first direction and the second direction, the second plane can be defined by the first direction and the third direction, and the third plane can 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-direction, and the second direction is the z-axis direction. In this case, the first plane is the xz plane, the second plane is the xy plane, and the third plane is the yz plane. In this case, the shell 21 can be a cube, the first direction can be the length direction, the second direction can be the up-down direction, and the third direction can be the front-back direction.

[0068] That is, as shown in Figures 1, 3, and 5 to 10, the size of the battery cell 22 in the first direction is greater than its size in the second direction, and the electrode group 3 is located at the end of the battery cell body 221 in the first direction. For example, the battery cell 22 has a conventional battery cell structure and is rectangular in shape. The length direction of the battery cell 22 is parallel to the first direction, the height direction of the battery cell 22 is parallel to the second direction, and the thickness direction of the battery cell 22 is parallel to the third direction. In this embodiment, the number of electrode groups 3 on a battery cell body 221 can be one or more, and the electrode groups 3 are all located at the end of the battery cell body 221 in the first direction. It should be noted that when there are multiple pole groups 3, this embodiment includes a situation where one pole group 3 is at one end of the cell body 221 in the first direction and another pole group 3 is at the other end of the cell body 221 in the first direction; it also includes a situation where multiple pole groups 3 are simultaneously located at the same end of the cell body 221 in the first direction; in addition, it also includes a situation where there are multiple cell bodies 221 and the pole group 3 of each cell body 221 is located at the end of the corresponding cell body 221 in the first direction, etc., which are not described in detail here. Moreover, in this embodiment, there is no limitation on whether the positive pole 31 and the negative pole 32 corresponding to a pole group 3 are at the same end of the cell body 221 in the first direction. That is, this embodiment includes the situation that the positive pole 31 and the negative pole 32 of a pole group 3 on a battery cell body 221 are located on different sides of the battery cell body 221; and there are multiple pole groups 3 on a battery cell body 221, the positive poles 31 of the multiple pole groups 3 are located on one side of the battery cell body 221, and the negative poles 32 of the multiple pole groups 3 are located on the other side of the battery cell body 221, that is, the situation that the battery cell body 221 has the same polarity on the same side in the first direction; it also includes the situation that there are multiple pole groups 3 on a battery cell body 221, and the polarities are different on the same side of the battery cell body 221 in the first direction, etc.

[0069] That is to say, by arranging the pole group 3 at the end of the battery cell body 221 in the first direction, that is, on the first surface 213, on the one hand, it is avoided that there is a need to reserve space on the outside of the battery cell body 221 in the second direction to extend the heat dissipation path; on the other hand, it is conducive to increasing the maximum size range of the battery cell body 221 in the second direction and improving the battery capacity.

[0070] In this embodiment, by limiting the relative position relationship between the first surface 213 and the second surface 214, the heat transfer direction of the heat transfer element can be further limited, thereby avoiding heat accumulation near the first surface 213 and affecting the heat dissipation effect near the pole 33.

[0071] In some specific embodiments of the present disclosure, the surface area of ​​the second surface 214 is greater than the surface area of ​​the first surface 213. That is, in this embodiment, the pole 33 is disposed on the first surface 213 with a smaller area, and the heat near the first surface 213 is transferred to the second surface 214 with a larger area through the heat transfer element, thereby expanding the heat dissipation area and further improving the heat dissipation effect.

[0072] For example, the shell 21 may include a side plate 211 and a cover plate 212. The side plate 211 encloses and defines a storage space that can be used to accommodate the battery cell 22, and the storage space can be closed by the cover plate 212. A through mounting hole is provided on the cover plate 212, and the pole 33 disclosed in the present invention can pass through the mounting hole to connect with the current collector 222 at the end of the battery cell body 221. At this time, a first surface 213 is provided on the cover plate 212, and the first surface 213 can be used as an end surface. A second surface 214 and a front side surface and a rear side surface parallel to the first plane are provided on the side plate 211, and the second surface 214 can be used as a top surface and a bottom surface. At this time, since at least a part of the pole 33 is a sheet-like structure, the pole 33 can be led out through the end surface of the shell 21 in a sheet-like manner by cooperating with the current collector 222 and the battery cell body 221. The total number of sheet-like lead-out poles 33 led out from the end surface can be one but is not limited to one. In addition, when the areas of the front side and the rear side are respectively larger than the area of ​​the second surface 214, and the area of ​​the second surface 214 is larger than the area of ​​the first surface 213, and the shape of the shell 21 is roughly the same as the shape of the battery cell body 221, the front side and the rear side can be defined as large surfaces, and the second surface 214 can be defined as a small surface.

[0073] Furthermore, when the pole 33 is located on the side of the cell body 221 in the first direction, the explosion-proof valve 1 can be designed on the side of the cell body 221 in the second direction, or on the side in the third direction. In this embodiment, by avoiding the placement of the explosion-proof valve 1 on the side of the cell body 221 in the first direction, more space can be reserved for the sheet-shaped pole 33 of the present disclosure, thereby further expanding the area of ​​the pole 33. It should be noted that a cooler can be provided on the side of the explosion-proof valve 1 away from the cell body 221, for example, a cooler can be provided above the explosion-proof valve 1. Optionally, a relief structure can be provided on the cooler to avoid blocking the opening of the explosion-proof valve 1. The exhaust direction 11 of the explosion-proof valve 1 can be shown in Figure 13, first upward and then outward. In conventional wound or laminated pole core battery structures in the prior art, the side cover plate needs to reserve space for the pole, explosion-proof valve, injection hole, etc. However, due to the height space of the cover plate, the current flow area of ​​the pole tabs and poles is small, resulting in high heat generation, which limits fast charging. In this embodiment, the explosion-proof valve 1 is not disposed together with the pole 33 on the first surface 213 , thereby increasing the area of ​​the sheet-shaped pole 33 .

[0074] In addition, the size of the explosion-proof valve 1 can be increased according to the space of the battery cell body 221 in the second direction and the third direction, and the number of explosion-proof valves 1 can be increased, thereby improving the system thermal safety of the battery pack 1000.

[0075] Furthermore, the explosion-proof valve 1 can be installed on the small surface. Since the large surface tends to expand more than the small surface, limiting the installation position of the explosion-proof valve 1 prevents the explosion-proof valve 1 from squeezing the large surface due to its installation on the large surface, thereby improving safety performance. In addition, when multiple single cells 2 are arranged along the third direction, the second surface 214 of each single cell 2 can be located on the same side. In this case, the installation position of the explosion-proof valve 1 can also be set on the same side, improving the compactness of the structure and facilitating installation.

[0076] In some specific embodiments of the present disclosure, as shown in FIG3 and FIG5 , the positive electrode 31 of the electrode group 3 is provided at one end of the cell body 221 in the first direction, and the negative electrode 32 is provided at the other end of the cell body 221 in the first direction.

[0077] For example, the first direction extends in the left-right direction. When there is only one electrode group 3 on the cell 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 body 221, and the negative electrode 32 is located at the right end of the cell body 221, thus forming a double-sided single-electrode structure. For example, the length of the cell body 221 extends in the left-right direction, with one positive electrode 31 located on the left side of the cell body 221 and one negative electrode 32 located on the right side of the cell body 221. During charging, the current in the cell body 221 flows from left to right.

[0078] When there are multiple electrode groups 3 on the cell body 221, there are also multiple positive electrode posts 31 and negative electrode posts 32. Each positive electrode post 31 is located on the left side of the cell body 221, and each negative electrode post 32 is located on the right side of the cell body 221. In other words, multiple positive electrode posts 31 are provided on the left side of the cell body 221, and multiple negative electrode posts 32 are provided on the right side of the cell body 221. For example, the length of the cell body 221 extends in the left-right direction, and there are two electrode groups 3. For ease of explanation, the two electrode groups 3 are divided into a first electrode group and a second electrode group. The positive electrode posts 31 of the first electrode group and the positive electrode posts 31 of the second electrode group are respectively located on the left side of the cell body 221, and the negative electrode posts 32 of the first electrode group and the negative electrode posts 32 of the second electrode group are respectively located on the right side of the cell body 221. As shown in Figures 4 and 7 , during charging, the current direction in the cell body 221 is from left to right. This shows that this embodiment includes the case where the polarities are different on opposite sides of the cell body 221 in the first direction and the polarity is the same on the same side.

[0079] In some specific embodiments of the present disclosure, as shown in Figure 5, there are multiple pole groups 3 on a battery cell body 221, and the multiple pole groups 3 are spaced apart and distributed in the second direction. For example, the second direction of the battery cell body 221 extends in the up-down direction, and the multiple pole groups 3 are spaced apart and distributed in the up-down direction. When the number of pole groups 3 is two, the positive pole 31 of the first pole group is located above the positive pole 31 of the second pole group, and the negative pole 32 of the first pole group is located above the negative pole 32 of the second pole group. It should be noted that in this embodiment, the multiple pole groups 3 can be located on the same side or different sides of the battery cell body 221 in the first direction, which is not limited here. This embodiment includes the case where the battery cell body 221 has the same polarity on the same side and different polarities on the same side in the first direction.

[0080] In some specific embodiments of the present disclosure, the positive electrode post 31 and the negative electrode post 32 of the electrode group 3 are arranged at the same end of the cell body 221 in the first direction. For example, if the first direction of the cell 22 is the left-right direction, one electrode group 3 is arranged on a cell body 221, and the positive electrode post 31 and the negative electrode post 32 of the electrode group 3 are simultaneously located on the left or right side of the cell body 221, depending on the position of the current collector 222. By arranging the positive electrode post 31 and the negative electrode post 32 of the electrode group 3 on the same side of the cell body 221, it is not only convenient for the centralized arrangement of the electrodes 33, but also convenient for the sequential arrangement of multiple cell bodies 221 along the first direction. For example, there are two cell bodies 221, divided into a first cell body and a second cell body, with the first cell body being located to the left of the second cell body, the electrode group 3 of the first cell body being located at the leftmost side of the first cell body, and the electrode group of the second cell body being located at the rightmost side of the second cell body. In this embodiment, the battery cell bodies 221 have different polarities on the same side of the first direction.

[0081] According to one embodiment of the present disclosure, as shown in FIG9 , there are two cell bodies 221 , which are arranged sequentially along a first direction. Each cell body 221 is provided with at least one electrode group 3 . In the first direction, the electrode group 3 of one cell body 221 is located at one end of the cell 22 , while the electrode group 3 of the other cell body 221 is located at the other end. For ease of explanation, the two cell bodies 221 are defined as a first cell body and a second cell body. The first cell body and the second cell body are arranged sequentially along the first direction. The electrode group 3 corresponding to the first cell body can be located at the leftmost side of the first cell body, while the electrode group 3 corresponding to the second cell body can be located at the rightmost side of the second cell body. In this case, the positive electrode 31 and negative electrode 32 of the electrode group 3 of the first cell body are located on the left side of the first cell body in the first direction, while the positive electrode 31 and negative electrode 32 of the electrode group 3 of the second cell body are located on the right side of the second cell body in the first direction.

[0082] Optionally, as shown in Figure 9, when there are two electrode groups 3, for ease of explanation, the two electrode groups 3 are defined as a first electrode group and a second electrode group, with the first electrode group corresponding to the first cell body and the second electrode group corresponding to the second cell body. The positive electrode 31 and the negative electrode 32 of the first electrode group are located on the left side of the first cell body, and the positive electrode 31 and the negative electrode 32 of the second electrode group are located on the right side of the second cell body. As shown in Figure 10, during charging, the current conduction direction inside the cell is: from the positive electrode 31 of the first electrode group on the left, through the interior of the first cell body, and back to the negative electrode 32 of the first electrode group. From the positive electrode 31 of the second electrode group on the right, through the interior of the second cell body, and back to the negative electrode 32 of the second electrode group.

[0083] As can be seen, for a structure with multiple sheet-shaped lead-out terminals 33 on the same side of the cell body 221, the positive and negative terminals 31 and 32 can be designed on the same or opposite sides. For a same-side, same-polarity design, the terminals 33 can be flexibly distributed on the cover plate 212 based on the actual required size and the height of the terminals 33 that can be manufactured. A same-side, different-polarity design not only increases the flow of current through the current collector 222, but also changes the current flow, shortens the current conduction path, and effectively reduces heat generation.

[0084] In some specific embodiments of the present disclosure, the poles 33 are welded to the corresponding current collectors 222 , and the connection firmness between the pole group 3 and the corresponding current collectors 222 is improved by welding.

[0085] According to one embodiment of the present disclosure, as shown in FIG2 , the pole 33 is in surface contact with the corresponding current collector 222 , and a larger contact area is used to increase the flow area.

[0086] Furthermore, as shown in FIG18 , the maximum length of the pole 33 can be defined as L1, the length of the cover plate 212 can be defined as L2, the gap between the pole 33 and the cover plate 212 can be defined as L3, the gap between two adjacent poles 33 can be defined as L4, and the number of poles 33 can be defined as N. These parameters can be related by the following formula: L1 = (L2-L3*2-(N-1)L4) / N. The number and size of the sheet poles 33 on the cover plate 212 can be designed based on the above formula.

[0087] According to one embodiment of the present disclosure, the heat transfer member includes a first heat conductor 44, which is disposed on the first surface 213 and is thermally connected to the pole 33. The first heat conductor 44 extends toward the second surface 214 to transfer heat from the pole 33 to the second surface 214. In other words, because the first heat conductor 44 extends generally toward the second surface 214 and is thermally connected to the pole 33, the heat from the first surface 213 near the pole 33 can be transferred to the second surface 214 by thermally connecting the pole 33 to the first heat conductor 44. It should be noted that the heat transfer member of the present disclosure, which draws heat away from the vicinity of the first surface 213, can draw heat away not only from the pole 33 but also from the current collector, etc., that is, it can draw heat away from the pole 33 itself and from the vicinity of the pole 33.

[0088] In some specific embodiments of the present disclosure, as shown in FIG12 , there are multiple single cells 2, and the first heat conductor 44 is thermally connected to the poles 33 of two adjacent single cells 2, respectively. That is, one first heat conductor 44 can cooperate with two single cells 2 at the same time, that is, two adjacent single cells 2 can share one first heat conductor 44, thereby improving the compactness of the structure.

[0089] Optionally, a plurality of single cells 2 are arranged in sequence along a third direction, which may be the thickness direction of the single cell 2. The first heat conducting member 44 can be thermally connected to the pole columns 33 of two adjacent single cells 2 arranged in the third direction respectively. For example, in the third direction, the number of single cells 2 is two, which are divided into a first single cell and a second single cell. The first single cell has a first pole column group, and the second single cell has a second pole column group. A pole column 33 of the first pole column group is located on the left side of the first single cell, and a pole column 33 of the second pole column group is also located on the left side of the second single cell. Also, since the first single cell and the second single cell are arranged in sequence along the third direction, at least one pole column 33 of the first single cell and at least one pole column 33 of the second single cell are adjacent to each other in the third direction, and there is a gap between them. The first heat conducting member 44 is arranged at this gap position, and through one first heat conducting member 44, it is possible to simultaneously conduct heat to the pole columns 33 of the two single cells. Optionally, in the second direction, the length of the first heat conducting member 44 can be equal to or greater than the length of the pole column 33. When they are equal, it can ensure the heat dissipation effect on the pole column 33. When it is greater than the length of the pole column 33, it is beneficial to transfer the heat of the pole column 33 to a larger range.

[0090] Furthermore, the first heat conducting member 44 is in surface contact with the pole column 33, which can increase the heat transfer effect.

[0091] In some specific embodiments of the present disclosure, as shown in FIG. 12, the battery pack 1000 further includes a connecting member 46. At least a part of the connecting member 46 is located between the radiator 45 and the pole column 33, and is thermally connected to the radiator 45 and the pole column 33 respectively. By providing the connecting member 46, the situation of difficult installation and low firmness between the heat dissipation member and the pole column 33 is solved. When the pole column 33 is connected to the radiator 45 through the connecting member 46, the radiator 45 can be located outside the connecting member 46, and the pole column 33 can be located inside the connecting member 46.

[0092] According to an embodiment of the present disclosure, the heat transfer member further includes a first connecting portion 461, a second connecting portion 462, and a third connecting portion 463 connected in sequence, that is, the connecting member 46 includes the first connecting portion 461, the second connecting portion 462, and the third connecting portion 463. The first connecting portion 461, the second connecting portion 462, and the third connecting portion 463 cooperate to form a receiving groove. The connecting member 46 including the first connecting portion 461, the second connecting portion 462, and the third connecting portion 463 can cooperate to form a U-shaped member. The receiving groove is used to receive the heat conducting member. The first connecting portion 461 is connected to the pole column 33 of one of the two single cells 2, the second connecting portion 462 is connected to the pole column 33 of the other of the two single cells 2, and the third connecting portion 463 is located between the first connecting portion 461 and the second connecting portion 462 and is connected to the first connecting portion 461 and the second connecting portion 462 respectively.

[0093] That is, as shown in Figures 14 to 16, the connector 46 includes a first connector portion 461, a second connector portion 462, and a third connector portion 463. The first connector portion 461 is connected to the terminal post 33 of one of the two battery cells 2 adjacent to each other in the third direction. The second connector portion 462 is connected to the terminal post 33 of the other of the two battery cells 2 adjacent to each other in the third direction. The third connector portion 463 is connected to the first connector portion 461 and the second connector portion 462, respectively, and cooperates to form a receiving groove for receiving the first thermal conductor 44. For example, if the third direction is the front-to-back direction, the first connector portion 461 and the second connector portion 462 may be spaced apart along the front-to-back direction, and the third connector portion 463 may be located between the first connector portion 461 and the second connector portion 462, with the rear end of the third connector portion 463 connected to the first connector portion 461 and the front end of the third connector portion 463 connected to the second connector portion 462. The first heat conducting member 44 is located between the first connecting portion 461 and the second connecting portion 462 and is thermally connected to the first connecting portion 461 , the second connecting portion 462 and the third connecting portion 463 .

[0094] According to one embodiment of the present disclosure, the heat transfer element further includes a fourth connection portion 464 . The fourth connection portion 464 is disposed at an end of the third connection portion 463 close to the second surface 214 . The fourth connection portion 464 is thermally connected to the heat transfer element and the second surface 214 , respectively.

[0095] That is to say, as shown in Figures 14 to 16, the connector 46 also includes a fourth connecting portion 464, which is located on the same side of the third connecting portion 463 as the first connecting portion 461 and the second connecting portion 462. The fourth connecting portion 464 is located at at least one end of the third connecting portion 463 in the second direction. The fourth connecting portion 464 can limit the first heat-conducting member 44. Optionally, the number of the fourth connecting portion 464 is two, one fourth connecting portion 464 is located at the upper end of the third connecting portion 463, and another fourth connecting portion 464 is located at the lower end of the third connecting portion 463. It can be seen that the periphery of the first heat-conducting member 44 can be multi-directionally heat-conducted by the first connecting portion 461, the second connecting portion 462, the third connecting portion 463 and the fourth connecting portion 464, so that heat is transferred to the radiator 45 in a timely and efficient manner. For example, it is thermally connected to the cooler by the fourth connecting portion 463.

[0096] 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 opposite to the first surface 213 and is capable of heat exchange with the electrode 33 .

[0097] That is, the heat dissipation assembly includes a heat sink 45, which is located on a side of the pole 33 away from the battery body 221 in the first direction and is thermally connected to the pole 33. In other words, designing the heat sink 45 outside the pole 33 can reduce the temperature rise of the pole 33.

[0098] According to one embodiment of the present disclosure, the heat sink 45 includes at least one tubular member having a first fluid channel therein for the flow of a cooling fluid. A portion of the tubular member serves as at least a portion of a heat transfer element. The tubular member structure allows for a longer length, which facilitates the use of a single tubular member for multiple poles 33, or even multiple battery cells 2. For example, a portion of the tubular member extends along a third direction, and multiple battery cells 2 are arranged sequentially along the third direction, allowing a single tubular member to serve multiple poles 33 of multiple battery cells 2. In this embodiment, the use of the tubular member as at least a portion of the heat sink 45 not only facilitates control of the extension direction of the tubular member, facilitating heat extraction from locations near the poles 33 when the tubular member serves as at least a portion of the heat transfer element, but also facilitates the use of a single tubular member for multiple poles 33, thereby improving structural compactness and component utilization. In addition, since the tubular member has a first fluid channel, cooling fluid is poured into the first fluid channel, and heat exchange between the radiator 45 and the vicinity of the pole 33 can be achieved through the fluid with a temperature difference.

[0099] Optionally, there are multiple tubular members, for example, four tubular members, which are arranged sequentially along the second direction and a portion of each tubular member can be disposed opposite the first surface 213. Every two tubular members can form a one-in, one-out loop. In this embodiment, the use of multiple tubular members is beneficial for increasing the range of heat extraction and temperature control.

[0100] In some specific embodiments of the present disclosure, the battery pack 1000 further includes a cooler, which is thermally conductively connected to the second surface 214. By arranging the cooler near the second surface 214, the heat near the second surface 214 can be drawn out, and heat exchange with the 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 itself. That is to say, by arranging the cooler near the second surface 214, not only can the temperature near the first surface 213, especially near the pole 33, be controlled through the heat transfer member in conjunction with the cooler to achieve timely heat dissipation near the pole 33, but also the heat can be dissipated from the second surface 214 to achieve temperature control at multiple positions on the shell 21.

[0101] According to one embodiment of the present disclosure, a second fluid channel is provided within the cooler for the flow of cooling fluid, and the cooler is thermally connected to the heat transfer element. Specifically, the cooler is provided with a second fluid channel filled with cooling fluid. Due to the temperature difference between the cooling fluid and the area near the second surface 214, and in conjunction with the fluid inlet and outlet, fluid flow is achieved, enabling rapid heat exchange near the second surface 214.

[0102] In addition, a second fluid channel is provided in the cooler, and a first fluid channel is provided in the radiator 45. The second fluid channel is connected to the first fluid channel. At this time, the cooler can be used as a liquid cooling plate. By also providing fluid in the radiator 45 and realizing the connection between the radiator 45 and the cooler, the heat dissipation effect for the position near the pole 33 can be improved.

[0103] According to one embodiment of the present disclosure, there are two coolers, and the single cell 2 is located between the two coolers. That is, one cooler is located on one side of the single cell 2 and corresponds to one second surface 214, and another cooler is located on the other side of the single cell 2 and corresponds to another second surface 214. It should be noted that one second surface 214 can correspond to one or more coolers, for example, two coolers are located on the upper side of the single cell 2, and one cooler is located on the lower side of the single cell 2. In other words, regardless of whether the number of coolers corresponding to one side of the single cell 2 is one or more, as long as at least one cooler is provided on both sides of the single cell 2, it falls within the scope of protection of the present disclosure.

[0104] For example, as shown in Figure 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 located at one end of the single cell 2 in the second direction, and the second cooler 42 is located at the other end of the single cell 2 in the second direction. When the first direction extends generally horizontally and the second direction extends generally vertically, the first cooler 41 can be located above the single cell 2, and the second cooler 42 can be located below the single cell 2. The first cooler 41 can conduct heat to the upper portion of the single cell 2, and the second cooler 42 can conduct heat to the lower portion of the single cell 2.

[0105] It can be seen that in this embodiment, by cooperating with the first cooler 41 and the second cooler 42, not only can a double-sided cooling sandwich-like cooling structure be formed for the single cell 2, but the temperature difference in the height direction of the single cell 2 can also be reduced. However, when the battery pack of the prior art realizes fast charging at a higher rate, the conventional upper or lower single-sided cooling method is adopted, which will cause a large temperature difference in the height direction of the single cell. In addition, this embodiment also realizes heat dissipation in the second direction by arranging the first cooler 41 and the second cooler 42 on the outside of the single cell 2 in the second direction, and realizes heat dissipation in the first direction by cooperating with the sheet-shaped pole 33 in the first direction, and can lead the heat near the pole 33 to the second surface 214 by cooperating with the heat transfer component, that is, it can realize multi-directional heat dissipation for the single cell 2.

[0106] In some specific embodiments of the present disclosure, as shown in FIG11 , the heat dissipation assembly further includes a second heat conductor 43 , which is thermally connected to the single cell 2 and the cooler, respectively. In other words, heat exchange between the single cell 2 and the cooler can be achieved through the second heat conductor 43 . In this embodiment, by providing the second heat conductor 43 , on the one hand, the cooler is prevented from being in direct contact with the single cell 2, which may easily damage the single cell 2 , and on the other hand, the need to design the cooler too large is avoided. Furthermore, when there are multiple single cells 2 , one second heat conductor 43 can correspond to multiple single cells 2 .

[0107] According to one embodiment of the present disclosure, as shown in FIG11 , the cooler and the second heat-conducting member 43 are each a sheet-shaped member, and the second heat-conducting member 43 is in surface contact with the cooler and the single battery 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, and the lower end surface of the second heat-conducting member 43 is in contact with the upper end surface of the single battery 2. This surface contact increases the heat conduction area, improves the force balance and heat dissipation balance at multiple locations on the single battery 2, and improves the force balance and heat dissipation balance of multiple single battery cells 2 when there are multiple single battery cells 2.

[0108] According to one embodiment of the present disclosure, the battery pack 1000 further includes a tray defining a storage space within which the battery cells 2 are located. A heat transfer element, a heat sink 45, and a cooler may also be located within the storage space. As shown in Figures 11 and 12, the heat sink 45 and the cooler are thermally connected to different locations on the battery cells 2. The use of the heat transfer element allows for timely removal of heat from the first surface 213, improving heat dissipation efficiency and facilitating rapid charging.

[0109] According to one embodiment of the present disclosure, the receiving space is open along at least one axial end thereof, and the cooler serves as the bottom plate or the top plate of the tray. For example, the first cooler 41 serves as the top plate of the tray, and the second cooler 42 serves as the bottom plate of the tray. This improves heat dissipation and avoids excessive height occupation caused by the top plate, bottom plate, first cooler 41, and second cooler 42 being present in the tray's height direction.

[0110] According to one embodiment of the present disclosure, the pole 33 is parallel to the third plane. For example, the length direction of the pole 33 extends along the second direction, and the height direction of the pole 33 extends along the first direction. That is, the pole 33 has a length direction and a height direction. The length direction of the pole 33 can be parallel to the second direction, and the height direction of the pole 33 can be parallel to the first direction. In this embodiment, by limiting the length direction and the height direction of the pole 33, it is convenient to connect the pole 33 to the current collector 222 and the external electrical equipment respectively. In addition, by making the pole 33 parallel to the third plane, it is beneficial to increase the contact area between the pole 33 and the first heat conductor 44, thereby increasing the heat transfer efficiency between the pole 33 and the first heat conductor 44.

[0111] According to one embodiment of the present disclosure, the connector 46 is welded to the pole 33, and this welding method can increase the connection reliability. Furthermore, the side surface of the sheet-shaped pole 33 is in surface contact with the connector 46. For example, the length direction of the pole 33 extends in the vertical direction, and the height direction extends in the left-right direction. The side surface of the pole 33 in the thickness direction of the battery cell body 221 contacts the side surface of the connector 46, which can increase the welding bonding area between the pole 33 and the connector 46. Optionally, the connector 46 is bonded to the heat sink 45, which can improve assembly efficiency.

[0112] Furthermore, the first heat conducting member 44 is also thermally connected to the current collector 222 corresponding to the pole 33 , thereby improving the heat dissipation effect of the current collector 222 .

[0113] Optionally, in the second direction, at least one end of the connector 46 is thermally connected to the cooler. The first heat conductor 44 can be made of a high thermal conductivity material. When the first heat conductor 44 is set between the cover plate 212 and the connector 46, the third connection portion 463 can lead the heat upward and / or downward along the cover plate 212 to the cooler, thereby increasing the heat dissipation. The heat of the pole 33 and the current collector 222 can be taken away by the connector 46 as a whole, thereby improving the fast charging capability, specifically including but not limited to the following heat dissipation paths:

[0114] Heat dissipation path 1: current collector 222 → first heat conducting member 44 → connecting member 46 → second heat conducting member 43 → cooler.

[0115] Heat dissipation path two: current collector 222 → first heat conductor 44 → connector 46 → heat sink 45 .

[0116] In summary, according to the embodiment of the present disclosure, the pole 33, the single cell 2 and the battery pack 1000 adopt a new sheet-like pole 33 structure and a design of a heat transfer member with a high heat dissipation path, which improves the high-rate fast charging capability. Different from the traditional two-pole battery cell with one positive and one negative on the side, the present disclosure adopts a sheet-like lead-out pole 33, which makes great use of the space of the cover plate 212, increases the heat dissipation area of ​​the collector 222, and improves the flow capacity of the battery cell 22; at the same time, combined with the design of the heat transfer member and the design of the cooler and the heat sink, such as the double-sided cooler, the connection member 46 and the heat sink 45, and the addition of a first heat conductor 44 between the connection member 46 and the cover plate 212 to take away the temperature rise of the pole 33, etc., it can improve the overall fast charging capability of the power battery.

[0117] The present disclosure also provides a vehicle including a battery pack 1000 according to any of the above embodiments. Since the battery pack 1000 has good heat dissipation and improves fast charging capability, the vehicle of the present disclosure also has the advantage of high fast charging capability, which will not be described in detail here.

[0118] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

DEPCT681. A battery pack (1000) is assembled with: cells (2), cells (2) assembled with a housing (21), cell core (22), and a number of terminals (33). The available space is set in the housing (21). The cell core (22) is arranged in the available space of the housing (21) with at least one first surface (213) and a second surface (214). Each terminal (33) is arranged on the cell core (22) and extending from the housing (21) from the first surface (213), and at least one of the terminals (33) is a plate-like element and a heat transfer element.

1. The heat is constructed to transfer heat on the cells (2) closest to the first surface (213) to the second surface (214).

2. The battery pack (1000) under claim 1, in which the housing (21) has edges that extend in the first, second and third directions. The first and second directions define the first plane, the first and third directions define the second plane, and the second and third directions define the third plane. 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.

1. A battery pack (1000) under either claim 1 or 2 in which the surface area of ​​the second surface (214) is greater than the surface area of ​​the first surface (213).

4. A battery pack (1000) under either claim 1 through 3 in which a heat transfer element is incorporated: a heat conducting element is arranged on the first surface (213) and is thermally connected to the terminals (33), and the heat conducting element extends toward the position where the second surface (214) is positioned to transfer the heat of the terminals (33) to the second surface (214).

5. A battery pack (1000) under either claim 1 through 4 in which a number of cells (2) are arranged and the heat conducting element is thermally connected to the terminals (33) of each of the two cells (2) arranged in an adjacent manner. 6.Battery pack(1000) under any one of claims 1 through 5 in which the heat transfer element is incorporated with a first connection piece(461), a second connection piece(462) and a third connection piece(463) connected in succession. The first connection piece(461), the second connection piece(462) and the third connection piece(463) are matched to form a support groove. The support groove is constructed to support the heat transfer element. The first connection piece(461) is connected to terminal(33) of one of the two cells(2). The second connection piece(462) is connected to terminal(33) of the other of the two cells(2), and the third connection piece(463) is positioned 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).7.

8. A battery pack (1000) under any of the claims 1 to 6 in which the heat transfer element is incorporated with a fourth connection piece (464), the fourth connection piece (464) is arranged on the end of the third connection piece (463) near the second surface (214), and the fourth connection piece (464) is thermally connected to the heat transfer element and the second surface (214).

9. A battery pack (1000) under any of the claims 1 to 7 in which the heat sink (45) is incorporated with at least one tubular element, the tubular element has a first fluid channel for the cooling fluid to flow, and some of the tubular element is incorporated as at least some of the heat transfer element. 10.

11. A battery pack (1000) under any of the claims 1 to 10 that includes: a second fluid channel provided in the cooler for the cooling fluid to flow and the cooler is thermally connected to a heat transfer element; 12. A battery pack (1000) under any of the claims 1 to 11 that has two coolers arranged and cells (2) positioned between the two coolers; 13. A battery pack (1000) under any of the claims 1 to 12 that has terminals (33) parallel to the third plane; 14. A vehicle incorporating a battery pack (1000) under any of the claims 1 to 13;

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