Battery Pack and Vehicle

Abstract

The present application discloses a battery pack and a vehicle. The battery pack includes single cells. Each single cell includes: a housing, an accommodation space is defined inside the housing, 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 housing has at least a first surface, a second surface, and a third surface, the first surface is connected to the second surface, and the first surface is parallel to the third plane, the second surface is parallel to the second plane, the third surface is parallel to the first plane, and the surface area of the second surface is larger than the surface area of the first surface; an electrode core, which is disposed in the accommodation space; and a plurality of pole columns, the pole columns are disposed on the electrode core and extend out of the housing from the second surface, and at least one pole column is a sheet-like body. The battery pack of the present application is beneficial to fast charging by providing a sheet-like pole column on the second surface.

Description

Technical Field

[0001] This application belongs to the technical field of batteries. Specifically, this application relates to a battery pack and a vehicle having the battery pack. Background Art

[0002] The electrode cores of the prior art usually adopt a winding or stacking structure. The cover plate is located on the wide side of the side surface. Positions such as pole posts, explosion-proof valves, and liquid injection holes need to be reserved on the side cover plate to implement the design of leading out the side pole posts. However, this existing design is limited by the small size of the side cover plate, and the current-carrying area of the tab and the pole post is small, resulting in a high degree of heat generation, which in turn limits fast charging. Summary of the Invention

[0003] An object of this application is to provide a battery pack that can solve the problem of limited fast charging ability of the battery in the background art.

[0004] According to a first aspect of this application, there is provided a battery pack. The battery pack includes single cells. Each single cell includes: a housing, an accommodation space is defined inside the housing, 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, and the second direction and the third direction define a third plane. The housing has at least a first surface, a second surface, and a third surface. The first surface is connected to the second surface, and the first surface is parallel to the third plane, the second surface is parallel to the second plane, and the third surface is parallel to the first plane. The surface area of the second surface is larger than the surface area of the first surface; an electrode core, the electrode core is disposed in the accommodation space; a plurality of pole posts, the pole posts are disposed on the electrode core and extend out of the housing from the second surface, and at least one of the pole posts is a sheet-like body.

[0005] According to an embodiment of this application, the battery pack further includes: a cooler, the cooler is disposed on a side of the pole post away from the second surface, and is in thermal conduction with the pole post and the second surface respectively.

[0006] According to an embodiment of this application, the number of the coolers is two, and the single cell is located between the two coolers.

[0007] According to an embodiment of this application, the battery pack further includes: a heat transfer member, at least a part of the heat transfer member is located between the cooler and the pole post, and can transfer the heat of the pole post and the second surface to the cooler.

[0008] According to an embodiment of this application, the heat transfer member includes: a heat conducting member, the heat conducting member is disposed on the second surface and is in heat transfer with the pole post and the cooler respectively.

[0009] According to an embodiment of the present application, in the third direction, the number of the pole columns is multiple, and two adjacent pole columns are respectively connected to a heat conducting member.

[0010] According to an embodiment of the present application, the heat transfer member further includes a first connecting portion, a second connecting portion, and a third connecting portion that are sequentially connected. The first connecting portion, the second connecting portion, and the third connecting portion cooperate to form a receiving groove for receiving the heat conducting member. The first connecting portion is connected to one of the two pole columns, the second connecting portion is connected to the other of the two pole columns, the third connecting portion is located between the first connecting portion and the second connecting portion, and the third connecting portion is respectively connected to the first connecting portion and the second connecting portion.

[0011] According to an embodiment of the present application, a second fluid passage is provided in the cooler for the cooling fluid to flow, and the cooler is thermally connected to the heat transfer member.

[0012] According to an embodiment of the present application, the pole column is parallel to the first plane.

[0013] According to an embodiment of the present application, the housing includes: a side plate having the first surface and the third surface; a cover plate provided on the side plate and enclosing the accommodation space with the side plate. The cover plate is provided with a through mounting hole, and the pole column passes through the mounting hole; the side plate includes: a first side portion extending along the second direction; a second side portion extending along the first direction. A first end of the second side portion is connected to an end portion of the first side portion in the second direction, and a second end of the second side portion extends in a direction away from the first side portion. The second side portion is connected to the cover plate.

[0014] According to an embodiment of the present application, the side plate further includes: a third side portion, a first end of the third side portion is connected to a second end of the second side portion, and a second end of the third side portion extends in a direction towards the first side portion. In the first direction, the third side portion and the second side portion are stacked.

[0015] According to an embodiment of the present application, a step portion is provided on a side of the cover plate close to the accommodation space. In the first direction, the cover plate includes a first side surface and a second side surface that are spaced apart. The first side surface is butted against an edge of the cover plate, and a thickness of a position on the cover plate corresponding to the first side surface is smaller than a thickness of a position on the cover plate corresponding to the second side surface. An end surface of the side plate in the first direction is connected to the first side surface.

[0016] According to a second aspect of the present application, a vehicle is provided, including the battery pack of any one of the above embodiments.

[0017] According to an embodiment of the present disclosure, on the one hand, a pole column with at least a part being a sheet structure is adopted. The outer surface area of the pole column is large, and the current-carrying area between the pole column and the current collector is large. The battery adopting the pole column of the present application has excellent fast charging ability. On the other hand, by arranging the pole column on the second surface, the number and / or area of the pole columns can be increased, further improving the heat dissipation effect and fast charging ability of the pole columns. It can be seen that arranging the pole column of the present application on the second surface is beneficial to realizing top lead-out, and the size of the second surface is large, which is beneficial to increasing the total area of the pole columns, thereby increasing the current-carrying area of the tab and the pole column, reducing the heating degree, and being beneficial to fast charging.

[0018] Through the following detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings, other features and advantages of the present application will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present application, and together with the description are used to explain the principles of the present application.

[0020] Figure 1 is a partial explosion view of a single cell according to Embodiment 1 provided by the present application;

[0021] Figure 2 is a connection schematic diagram of a current collector and a pole column according to an embodiment provided by the present application;

[0022] Figure 3 is an internal current schematic diagram of a single cell according to Embodiment 1 provided by the present application;

[0023] Figure 4 is a partial explosion view of a single cell according to Embodiment 2 provided by the present application;

[0024] Figure 5 is an assembly schematic diagram of a current collector and a cell body at an angle according to Embodiment 2 provided by the present application;

[0025] Figure 6 is an internal current schematic diagram of a single cell according to Embodiment 2 provided by the present application;

[0026] Figure 7 is a partial explosion view of a single cell according to Embodiment 3 provided by the present application;

[0027] Figure 8 is an assembly schematic diagram of a current collector and a cell body at an angle according to Embodiment 3 provided by the present application;

[0028] Figure 9It is a partial explosion diagram of the single cell in Embodiment 4 provided by this application;

[0029] Figure 10 It is an assembly schematic diagram of the current collector and the cell body in Embodiment 4 provided by this application from one angle;

[0030] Figure 11 It is an internal current schematic diagram of the single cell in Embodiment 4 provided by this application;

[0031] Figure 12 It is a partial explosion diagram of the single cell in Embodiment 5 provided by this application;

[0032] Figure 13 It is an assembly schematic diagram of the current collector and the cell body in Embodiment 5 provided by this application from one angle;

[0033] Figure 14 It is an internal current schematic diagram of the single cell in Embodiment 5 provided by this application;

[0034] Figure 15 It is a partial explosion diagram of the single cell in Embodiment 6 provided by this application;

[0035] Figure 16 It is an assembly schematic diagram of the current collector and the cell body in Embodiment 6 provided by this application from one angle;

[0036] Figure 17 It is an internal current schematic diagram of the single cell in Embodiment 6 provided by this application;

[0037] Figure 18 It is a partial explosion diagram of the single cell in Embodiment 7 provided by this application;

[0038] Figure 19 It is an assembly schematic diagram of the current collector and the cell body in Embodiment 7 provided by this application from one angle;

[0039] Figure 20 It is another assembly schematic diagram of the current collector and the cell body in Embodiment 7 provided by this application;

[0040] Figure 21 It is an internal current schematic diagram of the single cell in Embodiment 7 provided by this application;

[0041] Figure 22 It is a partial explosion diagram of the single cell in Embodiment 8 provided by this application;

[0042] Figure 23 It is an assembly schematic diagram of the current collector and the cell body in Embodiment 8 provided by this application from one angle;

[0043] Figure 24It is a schematic diagram of the internal current of the single battery in Embodiment 8 provided by this application;

[0044] Figure 25 It is a schematic assembly diagram of the cover plate and the side plate in an embodiment provided by this application;

[0045] Figure 26 It is a schematic assembly diagram of the cover plate and the side plate in another embodiment provided by this application;

[0046] Figure 27 It is a schematic assembly diagram of the cover plate and the side plate in yet another embodiment provided by this application;

[0047] Figure 28 It is a schematic assembly diagram of the heat dissipation component and the single battery in an embodiment provided by this application;

[0048] Figure 29 It is a schematic assembly diagram of the heat dissipation component and the single battery in another embodiment provided by this application;

[0049] Figure 30 It is a schematic assembly diagram of the heat dissipation component and the single battery in yet another embodiment provided by this application;

[0050] Figure 31 It is Figure 30 an enlarged view of the circled area A in;

[0051] Figure 32 It is a schematic assembly diagram of the pole column and the cover plate in an embodiment provided by this application.

[0052] Reference numerals

[0053] Battery pack 1000;

[0054] Explosion-proof valve 1; Exhaust direction 11;

[0055] Single battery 2; Housing 21; Side plate 211; First side portion 2111; Second side portion 2112; Third side portion 2113; Cover plate 212; Step portion 2121; First side surface 2122; Second side surface 2123; Electric core 22; Electric core body 221; Current collector 222;

[0056] Pole column group 3; Positive pole column 31; Negative pole column 32; Pole column 33; First connection section 331; Second connection section 332;

[0057] First cooler 41; Second cooler 42; Second heat conducting member 43; First heat conducting member 44; Connecting member 46; First connection portion 461; Second connection portion 462; Third connection portion 463. Detailed implementation manners

[0058] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present application.

[0059] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present application, its application, or its use.

[0060] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0061] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as limitations. Thus, other examples of the exemplary embodiments may have different values.

[0062] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof in subsequent drawings is not required.

[0063] The battery pack 1000 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0064] As Figures 1 to 32 shown, the present invention provides a battery pack 1000, which includes a single cell 2, and the single cell 2 includes a housing 21, an electrode assembly 22, and a plurality of terminal posts 33.

[0065] Specifically, a receiving space is defined in the housing 21. 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, and the second direction and the third direction define a third plane. The housing 21 has at least a first surface, a second surface, and a third surface. The first surface is connected to the second surface, and the first surface is parallel to the third plane, the second surface is parallel to the second plane, and the third surface is parallel to the first plane. The surface area of the second surface is larger than that of the first surface. The electrode assembly 22 is disposed in the receiving space, and the terminal posts 33 are disposed on the electrode assembly 22 and extend out of the housing 21 from the second surface, and at least one of the terminal posts 33 is a sheet-like body.

[0066] In other words, the battery pack 1000 according to an embodiment of the present invention is mainly composed of the single cell 2, and the single cell 2 is mainly composed of the housing 21, the electrode assembly 22, and a plurality of terminal posts 33. A receiving space is defined in the housing 21. For example, the housing 21 may mainly be composed of a side plate 211 and a cover plate 212, and the side plate 211 and the cover plate 212 may cooperate to form the receiving space, which can be used to accommodate the electrode assembly 22.

[0067] The outer surface of the housing 21 has a first edge, a second edge and a third edge. The first edge can extend substantially along a first direction, the second edge can extend substantially along a second direction, and the third edge can extend substantially along a third direction. Optionally, any two of the first direction, the second direction and the third direction are perpendicular to each other. It should be noted that the first direction, the second direction and the third direction are not limited to the perpendicular relationship. As long as the first direction, the second direction and the third direction are not parallel to each other, they fall within the protection scope of the present invention.

[0068] In addition, the first plane can be defined by the cooperation of the first direction and the second direction, the second plane can be defined by the cooperation of the first direction and the third direction, and the third plane can be defined by the cooperation of the second direction and the third direction. For example, the first direction is the X-axis direction, the second direction is the Z-axis direction, and the third direction is the Y-axis direction. At this time, the first plane is the XZ plane, the second plane is the XY plane, and the third plane is the YZ plane. The outer surface of the housing 21 at least includes a first surface, a second surface and a third surface. The first surface is connected to the second surface, that is, the first surface and the second surface can be butted. And the first surface is parallel to the third plane, the second surface is parallel to the second plane, and the third surface is parallel to the first plane. The surface area of the second surface is larger than that of the first surface, which can provide a larger installation space, such as for installing the pole 33 and the like. Optionally, the area of the third surface is the largest and the area of the first surface is the smallest. For example, the single cell 2 is a cuboid-like shape. The first direction of the single cell 2 is the length direction, the third direction is the thickness direction, and the second direction is the height direction. The area of the front and rear side surfaces of the cuboid-like shape is the largest, the area of the upper and lower side surfaces is larger than that of the left and right side surfaces. The front and rear side surfaces are the third surfaces, the upper and lower side surfaces are the second surfaces, and the left and right side surfaces are the first surfaces.

[0069] Wherein, the battery cell 22 can be composed of at least one battery cell body 221 and a current collector 222 connected to the corresponding battery cell body 221. The number of the battery cell bodies 221 can be one or more. Each battery cell body 221 can include a positive electrode plate, a separator and a negative electrode plate. The current collector 222 can be divided into a positive current collector and a negative current collector. The positive current collector is connected to the positive electrode plate, and the negative current collector is connected to the negative electrode plate. At least one pole group 3 is provided on one battery cell body 221. The pole group 3 includes two poles 33. The two poles 33 can be a positive pole 31 and a negative pole 32. The positive current collector is connected to the positive pole 31, and the negative current collector is connected to the negative pole 32. That is to say, one or more pole groups 3 are provided on at least one battery cell body 221, and each pole group 3 extends out of the accommodation space, which is convenient for external electrical equipment to connect and for heat dissipation. It should be noted that the number of the electrode plates shown in the drawings is only a schematic number.

[0070] The terminal post 33 is provided on the battery cell 22 and extends out of the housing 21 from the second surface, that is, the terminal post 33 can pass through the second surface and extend out of the accommodation space. That is, in the second direction, the terminal post 33 can be provided on the side of the battery cell body 221. Since the area of the second surface is larger than that of the first surface, at this time, by arranging the terminal post group 3 on the side of the single battery 2 in the second direction, it is avoided that a space for installing the terminal post 33 needs to be reserved on the outer side of the single battery 2 in the first direction, which is beneficial to increasing the maximum dimension range of the battery cell body 221 in the first direction and improving the battery capacity. In addition, since the area of the second surface is larger than that of the first surface, a larger installation area can be provided on the second surface of the battery cell body 221, improving the installation convenience of the terminal post group 3, and further expanding the area and current-carrying area of the terminal post 33. For example, more terminal posts 33 can be provided on the second surface, or the dimensions of the terminal post 33 in multiple directions can be increased.

[0071] When the shape of the accommodation space inside the housing 21 is substantially the same as the outer contour of the housing 21, the housing 21 has edges extending in the first direction, the second direction, and the third direction, and the battery cell body 221 also has edges extending in the first direction, the second direction, and the third direction. For example, the outer shape of the housing 21 is a cuboid, and the outer shape of the battery cell body 221 is also a cuboid. The length direction of the battery cell body 221 can be parallel to the first direction, the height direction of the battery cell body 221 is parallel to the second direction, and the thickness direction of the battery cell body 221 is parallel to the third direction. In addition, in this embodiment, the number of the terminal post groups 3 on one battery cell body 221 can be one or more. Whether it is one or more terminal post groups 3, the terminal post group 3 is provided on the side of the battery cell body 221 in the second direction. It should be noted that when the number of the terminal post groups 3 is multiple, this embodiment not only includes the case where one terminal post group 3 is on one side of the battery cell body 221 and another terminal post group 3 is on the other side of the battery cell body 221; it also includes the case where multiple terminal post groups 3 are located on the same side of the battery cell body 221 at the same time; in addition, it also includes the case where the number of the battery cell bodies 221 is multiple, and the terminal post group 3 of each battery cell body 221 is located on the side of the corresponding battery cell body 221 in the second direction, etc., which will not be elaborated here. And, in this embodiment, it is not limited whether the positive terminal post 31 and the negative terminal post 32 in one terminal post group 3 are on the same side of the battery cell body 221.

[0072] It should be noted that when the terminal post 33 is located on the second surface, the explosion-proof valve 1 can be designed at positions such as the first surface of the battery cell body 221. In this embodiment, by avoiding arranging the explosion-proof valve 1 on the second surface, it is avoided that the explosion-proof valve 1 and the terminal post 33 are concentrated on the second surface, and more space can be reserved for the terminal post 33 of the present application, which is convenient for further expanding the area of the terminal post 33.

[0073] In addition, the size of the explosion-proof valve 1 can be designed according to the size of the first surface of the single battery 2, and the number of explosion-proof valves 1 can be controlled, thereby improving the system thermal safety of the battery pack 1000. The exhaust direction 11 of the explosion-proof valve 1 can flow outward along the first direction, thereby improving safety.

[0074] Moreover, in this embodiment, at least one pole 33 is a sheet. The total number of pole groups 3 included in the single battery 2 can be one or more. When the number of pole groups 3 is more than one, the poles 33 of different pole groups 3 can be the same or different, which is not limited here. As long as there is a pole 33 using the new sheet pole 33 of the present application, it belongs to the protection scope of the present application.

[0075] Therefore, according to the single cell of the embodiment of the present application, on the one hand, a pole 33 having at least a part of a sheet structure is adopted, the outer surface area of ​​the pole 33 is large, and the flow area between the pole 33 and the current collector is large, and the battery adopting the pole 33 of the present application has a better fast charging capability; on the other hand, by setting the pole 33 on the second surface, the number and / or area of ​​the pole 33 can be increased, and the heat dissipation effect and fast charging capability of the pole 33 can be further improved. It can be seen that, compared with the solution of the prior art that the traditional pole is set on the first surface with a smaller area, the pole 33 of the present application is set on the second surface with a larger area, which is conducive to realizing top extraction, and the top here refers to the second surface formed as the upper surface of the shell 21. And the second surface is larger in size, which is conducive to increasing the total area of ​​the pole 33, so that the flow area of ​​the pole ear and the pole 33 can be increased, the degree of heat generation can be reduced, and it is conducive to fast charging.

[0076] Optionally, at least one of the positive pole 31 and the negative pole 32 of the pole group 3 is a pole 33 including a first connecting segment 331 and a second connecting segment 332, that is, the pole 33 is mainly composed of a first connecting segment 331 and a second connecting segment 332, wherein the first connecting segment 331 and the second connecting segment 332 are connected respectively, and the first connecting segment 331 can be used to connect with the current collector 222, for example, with the positive current collector or the negative current collector, wherein it should be noted that the pole ear of the present application can be the confluence of the positive and negative electrode foils, and the current collector 222 can be a structure formed by welding the pole ear, and at this time the current collector 222 and the pole ear can be two different states of the same substance. It should be noted that whether the pole ear and the current collector 222 are separately provided, or the pole ear and the current collector 222 are the same structure, they all belong to the protection scope of the present application.

[0077] Specifically, the first end of the second connection segment 332 is connected to the first connection segment 331, and the second end of the second connection segment 332 is used to be connected to an external electrical device. For example, the second connection segment 332 is located on the upper side of the first connection segment 331. The lower end of the first connection segment 331 can be connected to the positive current collector or the negative current collector. The upper end of the first connection segment 331 can be connected to the lower end of the second connection segment 332, and the upper end of the second connection segment 332 can be connected to an external electrical device.

[0078] It should be noted that at least one of the first connection segment 331 and the second connection segment 332 is a sheet-like body. That is to say, the pole 33 includes the following situations: Situation 1: Only the first connection segment 331 is a sheet-like body; Situation 2: Only the second connection segment 332 is a sheet-like body; Situation 3: Both the first connection segment 331 and the second connection segment 332 are sheet-like bodies.

[0079] The traditional pole of the prior art is a columnar body. The traditional pole is arranged at the end of the battery cell, and the diameter of the columnar body needs to be smaller than the thickness of the battery cell. Moreover, the surface area of the columnar body is related to the diameter, so the surface area of the columnar body is small. In contrast, at least a part of the pole 33 of the present application is a sheet-like body structure. The thickness of the sheet-like body is small, and the dimensions in multiple directions of the sheet-like body can be different from each other. Even if the thickness of the sheet-like body is smaller than the thickness of the battery cell 22, the sheet-like body can increase the total area of the pole 33 by expanding the dimensions in other directions. For example, when the thickness direction of the sheet-like body is the front-back direction, the sheet-like body can expand its dimensions in the length direction and the height direction. When at least the first connection segment 331 adopts a sheet-like body structure, it can not only increase the area of the pole 33, but also increase the current-carrying area of the current collector 222. By increasing the area of the pole 33, the heat dissipation effect can be improved, and by increasing the current-carrying area, the heating degree can be reduced, solving the technical problem that the fast charging ability of the battery with a traditional pole in the prior art is limited.

[0080] That is to say, since at least a part of the pole 33 is a sheet-like structure, through the cooperation of the pole 33 with the current collector 222 and the battery cell body 221, the sheet-like lead-out of the pole 33 can be realized. The total number of the sheet-like lead-out poles 33 can be one, but is not limited to one. Through the sheet-like structure, the area of the pole 33 and the current-carrying area of the current collector 222 can be increased, thereby improving the fast charging ability of the single battery 2.

[0081] Among them, the pole column group 3 includes but is not limited to the following situations: Situation 1: In a pole column group 3, only the positive pole column 31 is a pole column 33 with a first connection section 331 and a second connection section 332; Situation 2: In a pole column group 3, only the negative pole column 32 is a pole column 33 with a first connection section 331 and a second connection section 332; Situation 3: In a pole column group 3, both the positive pole column 31 and the negative pole column 32 are pole columns 33 with a first connection section 331 and a second connection section 332. Using the pole column 33 with the first connection section 331 and the second connection section 332 can solve the heat problem during the fast charging process. Therefore, the single cell 2 of the present application also has the same advantages, which is beneficial to achieving fast charging and will not be elaborated here.

[0082] Among them, as Figure 32 shown, the maximum length of the pole column 33 can be defined as L1, the length of the cover plate 212 can be defined as L2, the gap between the pole column 33 and the end of the cover plate 212 in the length direction can be defined as L3, the gap between two adjacent pole columns 33 can be defined as L4, and the number of pole columns 33 can be defined as N. The following formula can exist among the various parameters: L1 = (L2 - L3 * 2 - (N - 1)L4) / N.

[0083] According to an embodiment of the present application, as Figure 2 shown, at least one pole column 33 is an integrally formed part, that is, the positive pole column 31 and / or the negative pole column 32 is an integrally formed part. That is to say, through an integral forming process, for example, a pole column 33 prepared by a stamping process or the like includes both the first connection section 331 and the second connection section 332 at the same time. In this embodiment, by using the integrally formed pole column 33, it is beneficial to processing and production, and the step of connecting the first connection section 331 and the second connection section 332 together can be omitted.

[0084] In some specific embodiments of the present application, as Figure 4 shown, at least one pole column 33 is a rectangular part, that is, the positive pole column 31 and / or the negative pole column 32 is a rectangular part. That is to say, the first connection section 331 and the second connection section 332 can be combined to form a rectangular part, and the rectangular part is a plate-shaped part. That is, the first connection section 331 and the second connection section 332 can extend along the same plane. For example, the first connection section 331 is located above the second connection section 332, and the first connection section 331 and the second connection section 332 extend along the up and down directions respectively and are located in the same horizontal plane. In this embodiment, by using the pole column 33 with a rectangular structure, it is beneficial to connect the pole column 33 with the current collector 222 and external electrical equipment. For example, one side of the rectangular part is connected to the current collector 222 to ensure a sufficient current-carrying area. In addition, by using the rectangular part, it is beneficial to increase the area of the pole column 33 and the current-carrying area of the current collector 222 at the same time, thereby further improving the fast charging ability of the single cell 2.

[0085] In addition, when the terminal post 33 is a rectangular member, as Figure 2 shown, the spacing between the two side surfaces of the terminal post 33 along its thickness direction is uniform. For example, the length direction of the terminal post 33 extends in the horizontal direction, the height direction extends in the up-and-down direction, and the thickness direction extends in the front-and-back direction. For multiple positions on the terminal post 33, the spacing between the front surface and the back surface of the terminal post 33 is the same. In this embodiment, by using the sheet-shaped terminal post 33 with a uniform thickness, it is beneficial to improve the processing efficiency and the heat dissipation uniformity.

[0086] In some specific embodiments of the present application, as Figures 15 to 24 shown, the positive terminal post 31 of the terminal post group 3 is provided at one end of the battery cell body 221 in the second direction, and the negative terminal post 32 is provided at the other end of the battery cell body 221 in the second direction.

[0087] For example, as Figures 15 to 17 shown, the first direction of the housing 21 extends in the left-and-right direction, and the second direction extends in the up-and-down direction. When the number of the terminal post groups 3 on the battery cell body 221 is one, the terminal post group 3 includes a positive terminal post 31 and a negative terminal post 32. The positive terminal post 31 is located above the battery cell body 221, and the negative terminal post 32 is located below the battery cell body 221, that is, a single terminal post 33 structure with different sides is formed, as Figure 17 shown. When charging, the current direction inside the battery cell body 221 is from top to bottom. As Figures 18 to 21 shown, when the number of the terminal post groups 3 on the battery cell body 221 is multiple, the corresponding number of positive terminal posts 31 and negative terminal posts 32 is also multiple. Each positive terminal post 31 is located at the upper part of the battery cell body 221, and each negative terminal post 32 is located at the lower part of the battery cell body 221. That is to say, multiple positive terminal posts 31 are simultaneously provided at the upper part of the battery cell body 221, and multiple negative terminal posts 32 are simultaneously provided at the lower part of the battery cell body 221. Another example is, as Figure 21As shown, the number of the battery cell body 221 is one, and the number of the pole column groups 3 is two. For the convenience of description, the two pole column groups 3 are divided into a first pole column group and a second pole column group. The positive pole columns 31 of the first pole column group and the positive pole columns 31 of the second pole column group are respectively located at the upper part of the battery cell body 221, and the negative pole columns 32 of the first pole column group and the negative pole columns 32 of the second pole column group are respectively located at the lower part of the battery cell body 221. During charging, the current direction inside the battery cell body 221 is from top to bottom. When the number of the battery cell bodies 221 is two, the two battery cell bodies 221 can be arranged in sequence along the first direction. The positive pole column 31 of each battery cell body 221 can be located on the upper side of the corresponding battery cell body 221, and the negative pole column 32 of each battery cell body 221 can be located on the lower side of the corresponding battery cell body 221. That is to say, the positive pole column 31 and the negative pole column 32 of the pole column group 3 are located on the opposite sides of the battery cell body 221, which can include the situation where one battery cell body 221 has one or more pole column groups 3, or can also include the situation of one or more battery cell bodies 221.

[0088] According to an embodiment of the present application, as Figures 1 to 14 shown, the positive pole column 31 and the negative pole column 32 of the pole column group 3 are arranged at the same end of the battery cell body 221 in the second direction. For example, the battery cell body 221 extends along the horizontal direction, and the positive pole column 31 and the negative pole column 32 of one pole column group 3 are both located at the upper part of the battery cell body 221, or both located at the lower part of the battery cell body 221. One or more pole column groups 3 can be arranged on one battery cell body 221, and the positive pole column 31 and the negative pole column 32 of at least one pole column group 3 are both located at the same end of the battery cell body 221 in the second direction. That is to say, in this embodiment, whether one battery cell body 221 has only one pole column group 3 or has multiple pole column groups 3, as long as the positive pole column 31 and the negative pole column 32 of at least one pole column group 3 are both located at the same end of the battery cell body 221 in the second direction, it belongs to the protection scope of the present application.

[0089] Optionally, when the number of cell bodies 221 is two, each cell body 221 has a set of pole columns 3. For the convenience of description, the two sets of pole columns 3 are divided into a first set of pole columns and a second set of pole columns. Here, the following two cases may be included but are not limited to: The first case is that the two cell bodies 221 are distributed in the up-down direction. The positive pole column 31 and the negative pole column 32 of the first set of pole columns are located at the upper part of one cell body 221, and the positive pole column 31 and the negative pole column 32 of the second set of pole columns are located at the lower part of the other cell body 221. The second case is that the two cell bodies 221 are distributed in the left-right direction. The first set of pole columns is located at the upper part of one cell body 221, and the second set of pole columns is located at the upper part of the other cell body 221. During charging, the current conduction directions inside the two cell bodies 221 are as follows: from the positive pole column 31 of the first set of pole columns on the left, through the inside of the left cell body 221 and back to the negative pole column 32 of the first set of pole columns; from the positive pole column 31 of the second set of pole columns on the right, through the inside of the right cell body 221 and back to the negative pole column 32 of the second set of pole columns.

[0090] It can be seen that the positive pole column 31 and the negative pole column 32 of the cell body 221 can be designed on the same side or on different sides. Among them, for the same-side and same-polarity design on one cell body 221, the pole columns 33 can be flexibly distributed on the cover plate 212 according to the actual required size of the pole columns 33 and the height of the pole columns 33 that can be manufactured. For the same-side and different-polarity design on one cell body 221, it can not only increase the current passing through the current collector 222, but also change the current direction and shorten the current conduction path, effectively reducing heat generation.

[0091] In some specific embodiments of the present application, as Figures 12 to 14 , Figures 22 to 24 shown, the number of cell bodies 221 is multiple, and the multiple cell bodies 221 are sequentially distributed in the first direction. At least one set of pole columns 3 is provided on each cell body 221. For example, the number of cell bodies 221 is two, which are divided into a first cell body and a second cell body. The first cell body is located on the left side of the second cell body. At least one set of pole columns 3 is respectively provided on the first cell body and the second cell body. The positive pole column 31 and the negative pole column 32 of the set of pole columns 3 can be located on the same side or on different sides of the corresponding cell body 221.

[0092] In some specific embodiments of the present application, as Figures 4 to 6 , Figures 12 to 14 , Figures 18 to 24As shown in the figure, the number of pole groups 3 on a single battery cell 2 is multiple, and the multiple pole groups 3 are spaced apart and distributed in the first direction. For example, the first direction of the battery cell body 221 extends along the left - right direction. The multiple pole groups 3 on one battery cell body 221 are spaced apart and distributed along the left - right direction. When the number of pole groups 3 is two, they are divided into a first pole group and a second pole group. The positive - pole terminal 31 of the first pole group can be located on the left side of the positive - pole terminal 31 of the second pole group, and the negative - pole terminal 32 of the first pole group can be located on the left side of the negative - pole terminal 32 of the second pole group. When the single battery cell 2 includes two battery cell bodies 221, they are divided into a first battery cell body and a second battery cell body. The distributions of the pole groups 3 on the first battery cell body and the second battery cell body can be the same or different. For example, the first battery cell body corresponds to the first pole group, and the second battery cell body corresponds to the second pole group. The positive - pole terminal 31 and the negative - pole terminal 32 of the first pole group can be located on the same side or different sides of the first battery cell body, and the positive - pole terminal 31 and the negative - pole terminal 32 of the second pole group can be located on the same side or different sides of the second battery cell body. That is to say, in this embodiment, whether there is one battery cell body 221 with multiple pole groups 3 on it, or there are multiple battery cell bodies 221, and each battery cell body 221 has at least one pole group 3, as long as the multiple pole groups 3 in the single battery cell 2 are distributed along the first direction, it falls within the protection scope of this application. In addition, the positive - pole terminal 31 and the negative - pole terminal 32 within the pole group 3 can be arranged along the third direction, or can be arranged on the same side or different sides of the battery cell body 221 along the second direction, all of which fall within the protection scope of this application.

[0093] According to an embodiment of the present application, as Figure 7 and Figure 8 shown in the figure, the number of pole groups 3 on one battery cell body 221 is multiple, and the multiple pole groups 3 are spaced apart and distributed in the third direction. Any two of the first direction, the second direction, and the third direction are perpendicular to each other. For example, the first direction is the left - right direction, the second direction is the up - down direction, and the third direction is the front - back direction. There are multiple pole groups 3 provided on one battery cell body 221, and the multiple pole groups 3 can be distributed along the front - back direction. When the number of pole groups 3 is two, the two pole groups 3 can be divided into a first pole group and a second pole group. The first pole group is located behind the second pole group. The positive - pole terminal 31 of the first pole group is located behind the positive - pole terminal 31 of the second pole group, and the negative - pole terminal 32 of the second pole group is located behind the negative - pole terminal 32 of the second pole group.

[0094] In some specific embodiments of the present application, the pole 33 is welded to the corresponding current collector 222. By adopting the welding method, the connection firmness between the pole group 3 and the corresponding current collector 222 is improved.

[0095] According to an embodiment of the present application, the terminal post 33 is in surface contact with the corresponding current collector 222. By adopting a larger contact area, the current-carrying area is increased.

[0096] According to an embodiment of the present invention, the battery pack 1000 further includes a cooler. The cooler is disposed on a side of the terminal post 33 away from the second surface and is in thermal conduction with the terminal post 33 and the second surface respectively. By providing the cooler, the heat of the terminal post 33 can be led out, the heat dissipation capacity of the single battery 2 can be improved, which is beneficial to realizing fast charging.

[0097] In some specific embodiments of the present invention, the number of coolers is two, and the single battery 2 is located between the two coolers. That is to say, the battery pack 1000 further includes two coolers, which are divided into a first cooler 41 and a second cooler 42. For example, the single battery 2 has a length direction and a height direction. The size of the single battery 2 in the length direction is greater than the size in the height direction. The length direction extends substantially horizontally, and the height direction extends substantially vertically. The first cooler 41 can be located above the single battery 2, and the second cooler 42 can be located below the single battery 2.

[0098] In this embodiment, heat conduction can be performed on the upper part of the single battery 2 through the first cooler 41, and heat conduction can be performed on the lower part of the single battery 2 through the second cooler 42. In a conventional battery system, a single-sided cooling method, either upper or lower, will cause a large temperature difference in the height direction of the battery. In this embodiment, through the cooperation of the first cooler 41 and the second cooler 42, not only can a sandwich-like cooling structure be formed to reduce the temperature difference in the height direction of the single battery 2, but also by disposing the first cooler 41 and the second cooler 42 on the outer sides of the single battery 2 in the second direction respectively, heat dissipation in the second direction can be realized. Cooperating with the sheet-like terminal post 33 extending substantially in the second direction can improve the heat dissipation efficiency in the second direction, and can achieve a greater degree of heat dissipation for parts such as the tab and the terminal post 33 of the single battery 2.

[0099] In some specific embodiments of the present invention, as Figure 28 shown, the battery pack 1000 further includes a heat transfer member 46. At least a part of the heat transfer member 46 is located between the cooler and the terminal post 33 and can transfer the heat of the terminal post 33 and the second surface to the cooler. That is to say, the heat transfer member 46 can play a role in conducting heat. At least a part of the heat of the single battery 2, especially the heat near the terminal post 33 and the second surface, can be transferred to the cooler through the heat transfer member 46, realizing fast heat dissipation of the single battery 2, which is beneficial to realizing fast charging.

[0100] In this embodiment, by providing the heat transfer member 46, the problems of difficult installation and low firmness between the cooler and the pole 33 are solved. When the pole 33 is connected to the cooler through the heat transfer member 46, the cooler can be located outside the heat transfer member 46, and the pole 33 can be located inside the heat transfer member 46.

[0101] According to an embodiment of the present invention, the heat transfer member 46 includes a first heat conducting member 44, and the first heat conducting member 44 is disposed on the second surface and is in heat transfer connection with the pole 33 and the cooler respectively. That is to say, the first heat conducting member 44 can be installed on the second surface and can transfer the heat of the pole 33 to the cooler. The first heat conducting member 44 can be directly or indirectly connected to the pole 33 and the cooler, and this is not limited herein. As long as the first heat conducting member 44 that can play a role in heat conduction is used, it belongs to the protection scope of this application.

[0102] In some specific embodiments of the present invention, in the third direction, the number of poles 33 is multiple, and two adjacent poles 33 are respectively connected to a first heat conducting member 44. For example, the third direction is the front-back direction, and multiple poles 33 are arranged along the front-back direction. It should be noted that the multiple poles 33 can belong to the same or different single cells 2. At least one first heat conducting member 44 is disposed between the previous pole 33 and the next pole 33, and the heat of these two poles 33 can be transferred to the first heat conducting member 44 and can be transferred to the position where the cooler is located by the first heat conducting member 44. That is to say, multiple poles 33 can share a first heat conducting member 44, improving the structural compactness and space utilization rate.

[0103] According to an embodiment of the present invention, as Figure 31 shown, the heat transfer member 46 further includes a first connecting portion 461, a second connecting portion 462, and a third connecting portion 463 that are connected in sequence. The first connecting portion 461, the second connecting portion 462, and the third connecting portion 463 cooperate to form a receiving groove for receiving the first heat conducting member 44. The first connecting portion 461 is connected to one of the two poles 33, the second connecting portion 462 is connected to the other of the two poles 33, the third connecting portion 463 is located between the first connecting portion 461 and the second connecting portion 462, the third connecting portion 463 is respectively connected to the first connecting portion 461 and the second connecting portion 462, and the third connecting portion 463 can be in heat conducting connection with the cooler. In the existing battery system, a thin connecting piece is usually used, resulting in a limited over-current area and serious heating. The heat transfer member 46 of this application includes a first connecting portion 461, a second connecting portion 462, and a third connecting portion 463, and has a bent contact design, which can expand the heat dissipation path, improve the heat dissipation effect, and reduce the heating degree. In addition, as Figure 31As shown, a groove is provided on the outer surface of the second connecting portion 462 along its thickness direction, which can improve the heat dissipation effect. Moreover, the first connecting portion 461, the second connecting portion 462, and the third connecting portion 463 can protect the sheet-shaped pole 33, preventing the sheet-shaped pole 33 from being deformed by external forces.

[0104] For example, when the third direction is the front-back direction, the first connecting portion 461 and the second connecting portion 462 can be spaced apart and distributed along the front-back direction. The third connecting portion 463 can be located between the first connecting portion 461 and the second connecting portion 462. The rear end of the third connecting portion 463 is connected to the first connecting portion 461, and the front end of the third connecting portion 463 is connected to the second connecting portion 462. The 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 respectively. In addition, the third connecting portion 463 is thermally connected to the cooler.

[0105] In some specific embodiments of the present application, a second fluid passage is provided in the cooler for the cooling fluid to flow through, and the cooler is thermally connected to the heat transfer member 46. That is to say, a fluid passage is provided in the cooler. At this time, the cooler can be used as a liquid cooling plate, which can improve the heat dissipation effect at the position near the pole 33.

[0106] According to an embodiment of the present application, at least one pole 33 is parallel to the first plane. At this time, the length direction of at least one pole 33 extends along the first direction, and the height direction of the pole 33 extends along the second direction. That is to say, the pole 33 has a length direction and a height direction. The length direction of the pole 33 can be parallel to the first direction, and the height direction of the pole 33 can be parallel to the second direction. In this embodiment, by defining the length direction and the height direction of the pole 33 to be the same as the extension direction of the housing 21, it is not only beneficial to the assembly of the pole 33 and the cover plate 212, but also beneficial to two poles 33 sharing one first heat conducting member 44 and beneficial to two poles 33 sharing one heat transfer member 46.

[0107] According to an embodiment of the present application, the housing 21 includes a side plate 211 and a cover plate 212. The side plate 211 includes a first side portion 2111 and a second side portion 2112. The side plate 211 has a first surface and a third surface. The cover plate 212 is provided on the side plate 211 and encloses a receiving space with the side plate 211. A through mounting hole is provided on the cover plate 212, and the pole 33 passes through the mounting hole. The first side portion 2111 extends along the second direction, the second side portion 2112 extends along the first direction. The first end of the second side portion 2112 is connected to the end of the first side portion 2111 in the second direction. The second end of the second side portion 2112 extends in a direction away from the first side portion 2111, and the second side portion 2112 is connected to the cover plate 212.

[0108] Among them, the cover plate 212 can be selected but not limited to an aluminum cover plate (the thickness range can be 0.5 - 3.5 mm) or a steel cover plate (the thickness range: 0.2 - 2 mm), and the side plate 211 can be selected but not limited to an aluminum plate (the thickness range can be 0.3 - 2 mm) or a steel plate (the thickness range can be 0.1 - 1 mm).

[0109] For example, the housing 21 is mainly composed of a side plate 211 and a cover plate 212. The side plate 211 encloses the above-mentioned accommodating space. The cover plate 212 can be located on one side of the side plate 211, that is, on the outer side of the axial direction of the accommodating space. The accommodating space has an open end communicating with it. The cover plate 212 is connected to the side plate 211, and the open end can be closed through the cover plate 212. An installation hole is provided on the cover plate 212, and the installation hole can extend along the thickness direction of the cover plate 212. One of the first connection section 331 and the current collector 222 passes through the installation hole and is connected to the other of the first connection section 331 and the current collector 222. For example, the first connection section 331 passes through the installation hole and is connected to the current collector 222, or the current collector 222 passes through the installation hole and is connected to the first connection section 331, that is, either the first connection section 331 or the current collector 222 can pass through the installation hole.

[0110] In this embodiment, by providing the installation hole on the cover plate 212, it is beneficial to connect the pole column 33 and the current collector 222. It should be noted that when pole columns 33 are respectively provided on both sides of the housing 21, open ends can be respectively provided at both ends of the accommodating space.

[0111] According to an embodiment of the present application, the cross-sectional area of the side of the current collector 222 close to the battery cell body 221 is larger than the cross-sectional area of the side of the current collector 222 close to the first connection section 331, which is beneficial to the connection between the current collector 222 and the first connection section 331, avoids the current collector 222 occupying too much space and interfering with its connection with the first connection section 331, and can also ensure the current-carrying area.

[0112] Optionally, the current collector 222 includes a first section body and a second section body. The cross-section of the first section body is triangular, one side of the first section body is connected to the battery cell 22, the second section body is connected to a vertex on the side of the first section body away from the battery cell 22, and the second section body is connected to the first connection section 331. Through the cooperation of the first section body and the second section body, an effective connection between the current collector 222 and the battery cell body 221 and the first section body can be realized, and in addition, the current-carrying area of the current collector 222 can be increased.

[0113] According to an embodiment of the present application, the second section body is welded to the first connection section 331, which can make the connection between the second section body and the first connection section 331 reliable.

[0114] Optionally, the cover plate 212 is welded to the side plate 211, which can improve the connection firmness between the two. That is to say, laser welding or other welding methods are used at the connection of the cover plate 212 and the side plate 211.

[0115] According to an embodiment of the present application, as Figure 26 shown, the side plate 211 includes a first side portion 2111 and a second side portion 2112. The first side portion 2111 extends in the second direction. The first end of the second side portion 2112 is connected to the end of the first side portion 2111 in the second direction. The second end of the second side portion 2112 extends in a direction away from the first side portion 2111. The second side portion 2112 is connected to the cover plate 212, and there may be an included angle between the second side portion 2112 and the first side portion 2111. For example, the first side portion 2111 extends in the up and down direction. The inner end of the second side portion 2112 is connected to the upper end of the first side portion 2111. The outer end of the second side portion 2112 extends outward and extends in the horizontal direction. In this embodiment, by using the cooperation of the first side portion 2111 and the second side portion 2112, a firm connection between the second side portion 2112 and the cover plate 212 can be achieved. During welding, it can be welded along the Figure 26 arrow direction in the position indicated by the arrow.

[0116] In the prior art, the contact area between the side plate 211 and the cover plate 212 is small. Limited by the low welding firmness, the size of the cover plate 212 cannot be designed to be large, which in turn limits the arrangement space of the pole 33. The current-carrying area of the pole and the tab is small, resulting in high heat generation and limited fast charging. Therefore, direct welding can be performed at the conventional thickness. When the thickness of the cover plate 212 is too thin, such as less than or equal to 0.5 mm, the cover plate 212 or the side plate 211 can adopt the design of the following embodiment to achieve curling or local thickening.

[0117] In some specific embodiments of the present application, as Figure 25As shown, the side plate 211 further includes a third side portion 2113. The first end of the third side portion 2113 is connected to the second end of the second side portion 2112. The second end of the third side portion 2113 extends in the direction of the first side portion 2111. In the first direction, the third side portion 2113 and the second side portion 2112 are stacked. For example, the first side portion 2111 extends in the vertical direction. The inner end of the second side portion 2112 is connected to the upper end of the first side portion 2111. The outer end of the second side portion 2112 extends outward and extends in the horizontal direction. The outer end of the third side portion 2113 is connected to the outer end of the second side portion 2112. The inner end of the third side portion 2113 extends toward the position where the first side portion 2111 is located. That is, in the vertical direction, the second side portion 2111 is located above the third side portion 2113. The second side portion 2111 and the third side portion 2113 cooperate to form a flanging structure. In this embodiment, by the cooperation of the second side portion 2111 and the third side portion 2113, the thickness can be increased by curling. During welding, it can be welded along Figure 25 the arrow direction in the position indicated by the arrow.

[0118] It should be noted that for the connection between the cover plate 212 and the side plate 211, multiple reliable connection schemes can be matched according to the thickness of the cover plate 212 and the side plate 211. The length of the cover plate 212 can be flexibly designed to increase the available layout space of the terminal post 33 and improve the current-carrying capacity.

[0119] According to an embodiment of the present application, a stepped portion 2121 is provided on the side of the cover plate 212 close to the accommodation space. In the first direction, the cover plate 212 includes a first side surface 2122 and a second side surface 2123 that are spaced apart. The first side surface 2122 is butted against the edge of the cover plate 212. The thickness of the position on the cover plate 212 corresponding to the first side surface 2122 is less than the thickness of the position on the cover plate 212 corresponding to the second side surface 2123. The end surface of the side plate 211 in the first direction is connected to the first side surface 2122. For example, as Figure 27 shown, a stepped portion 2121 is provided on the side of the cover plate 212 close to the accommodation space. In the first direction, the cover plate 212 includes a first side surface 2122 and a second side surface 2123 that are spaced apart. The first side surface 2122 is butted against the edge of the cover plate 212. The thickness of the position on the cover plate 212 corresponding to the first side surface 2122 is less than the thickness of the position on the cover plate 212 corresponding to the second side surface 2123. The end surface of the side plate 211 in the first direction is connected to the first side surface 2122. Local thickening is achieved through the stepped portion 2121 to improve the welding feasibility and welding quality. During welding, it can be welded along Figure 27 the arrow direction in the position indicated by the arrow.

[0120] In some specific embodiments of the present application, such as Figures 27 to 31As shown, the battery pack 1000 of the present application further includes a tray and a heat dissipation component, and the cooler can be at least part of the heat dissipation component. Specifically, a receiving space is defined in the tray, the single cell 2 is located in the receiving space, the heat dissipation component is located in the receiving space, and the heat dissipation component is thermally connected to the single cell 2. By adopting the heat dissipation component, the heat of the single cell 2 can be timely dissipated, the heat dissipation efficiency is improved, which is beneficial to the realization of fast charging.

[0121] According to an embodiment of the present application, the number of the single cells 2 is multiple, and the multiple single cells 2 are arranged in sequence along the third direction, and the first heat conducting member 44 is respectively thermally connected to the electrode posts 33 of two adjacent single cells 2 in the third direction.

[0122] That is to say, the number of the single cells 2 is multiple, and the multiple single cells 2 are arranged in sequence along the third direction, and the third direction can be the thickness direction of the single cell 2. Each single cell 2 can have one or more cell bodies 221. The first heat conducting member 44 is respectively thermally connected to the electrode posts 33 of two adjacent single cells 2 in the third direction. For example, in the third direction, the number of the 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 electrode post group, and the second single cell has a second electrode post group. An electrode post 33 of the first electrode post group is located at the upper part of the first single cell, and an electrode post 33 of the second electrode post group is also located at the upper part 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 electrode post 33 of the first single cell and at least one electrode post 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 the electrode posts 33 of the two single cells can be thermally conducted simultaneously through one first heat conducting member 44. Optionally, in the first direction, the length of the first heat conducting member 44 can be equal to or greater than the length of the electrode post 33. When they are equal, the heat dissipation effect on the electrode post 33 can be ensured. When it is greater than the length of the electrode post 33, it is beneficial to transfer the heat of the electrode post 33 to a larger range.

[0123] Furthermore, the first heat conducting member 44 is in surface contact with the electrode post 33, which can increase the heat transfer effect.

[0124] According to an embodiment of the present application, the heat dissipation component further includes a second heat conducting member 43. The second heat conducting member 43 is located between the cooler and the third connecting portion 463 and is thermally connected to the cooler and the third connecting portion 463 respectively. That is to say, through the second heat conducting member 43, heat exchange between the single cell 2 and the cooler can be realized, especially the heat near the third connecting portion 463 can be taken away. In this embodiment, by providing the second heat conducting member 43, on the one hand, it avoids the easy damage of the single cell 2 caused by the direct contact between the cooler and the single cell 2, and on the other hand, it avoids the need to design the cooler too large. And when the number of single cells 2 is multiple, one second heat conducting member 43 can correspond to multiple single cells 2.

[0125] According to an embodiment of the present application, the heat transfer member 46 is welded to the pole 33, and the connection reliability can be increased by welding. Further, the side surface of the pole 33 is in surface contact with the heat transfer member 46. For example, the length direction of the pole 33 extends in the up and down direction, and the height direction extends in the left and right direction. The side surface of the pole 33 in the thickness direction of the battery cell body 221 is in contact with the side surface of the heat transfer member 46, which can increase the welding joint area between the pole 33 and the heat transfer member 46. Optionally, the heat transfer member 46 is bonded to the cooler, which can improve the assembly efficiency.

[0126] According to an embodiment of the present application, the cooler and the second heat conducting member 43 are respectively sheet-like bodies. The second heat conducting member 43 is in surface contact with the cooler and the single cell 2 respectively, for example, in surface contact with the third connecting portion 463. 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 cell 2 respectively. By means of surface contact, the heat conduction area is increased, and the force balance and heat dissipation balance at multiple positions on the single cell 2 are improved. And when the number of single cells 2 is multiple, the force balance and heat dissipation balance of multiple single cells 2 are improved.

[0127] That is to say, the present application can improve the fast charging ability of the system through a double-sided cooling structure, the heat transfer member 46 is bent to contact the cooling, and high thermal conductivity materials are added between the pole 33 and the cover plate 212 and between the heat transfer member 46 and the cover plate 212. The following heat dissipation paths can be included but are not limited to: (1) current collector 222 → cover plate 212 → first heat conducting member 44 → heat transfer member 46 → cooler; (2) current collector 222 → cover plate 212 → high thermal conductivity material → sheet-like pole 33 → heat transfer member 46 → cooler. The heat transfer member 46 dissipates heat through the thermally conductive structural adhesive → cooler, optimizing the overall heat dissipation path and improving the fast charging ability.

[0128] According to an embodiment of the present application, at least one end of the accommodation space is open along its axis, 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, which can improve the heat dissipation effect and also avoid excessive height occupied space caused by the simultaneous presence of the top plate, the bottom plate, the first cooler 41, and the second cooler 42 in the height direction of the tray.

[0129] The single cell 2 according to the present application will be described in detail below with reference to specific embodiments.

[0130] Embodiment 1

[0131] As Figures 1 to 3 shown, the upper end of a cell body 221 has a positive electrode terminal 31 and a negative electrode terminal 32. The positive electrode terminal 31 and the negative electrode terminal 32 are spaced apart in the horizontal direction, that is, the first direction is the left-right direction. There are two terminals 33 with different polarities on the same side of the cell body 221, that is, a sheet-like lead-out design with double terminals 33 on the same side is adopted. As Figure 3 shown, at this time, the current direction during charging is from the positive electrode terminal 31 flowing into the interior of the cell body 221, and then flowing to the negative electrode terminal 32.

[0132] Embodiment 2

[0133] As Figures 4 to 6 shown, the upper end of a cell body 221 has two terminal groups 3, which are divided into a first terminal group and a second terminal group. The first terminal group is located on the left side of the second terminal group. The positive electrode terminal 31 of the first terminal group is located behind the negative electrode terminal 32 of the first terminal group. The positive electrode terminal 31 of the second terminal group is located behind the negative electrode terminal 32 of the second terminal group. That is, the two terminals 33 along the thickness direction of the cell body 221 have different polarities, and the terminals are of the same polarity along the length direction of the cell body 221. At this time, the first direction is the length direction of the cell 22 and the cell body 221, and the third direction is the thickness direction of the cell 22 and the cell body 221. The positions of the terminals 33 can be arranged in parallel or staggered in the thickness direction, and can be flexibly designed. Taking the first terminal group as an example, as Figure 6 shown, the charging current is from the positive electrode terminal 31 flowing into the interior of the cell body 221, and then flowing to the negative electrode terminal 32.

[0134] Embodiment 3

[0135] As Figures 7 to 8As shown in the figure, the upper end of a battery cell body 221 has two pole groups 3, which are divided into a first pole group and a second pole group. The first pole group is located at the rear side of the second pole group. The positive pole 31 of the first pole group is located at the rear side of the positive pole 31 of the first pole group, and the negative pole 32 of the first pole group is located at the rear side of the negative pole 32 of the second pole group. That is, the two poles 33 along the thickness direction of the battery cell body 221 have the same polarity, and the polarities are different along the length direction of the battery cell body 221. At this time, the first direction is the length direction of the battery cell 22 and the battery cell body 221, and the third direction is the thickness direction of the battery cell 22 and the battery cell body 221. The positions of the poles 33 can be arranged in parallel or staggered in the thickness direction, and can be flexibly designed. Taking the first pole group as an example, the charging current flows from the positive pole 31 into the interior of the battery cell body 221 and then flows to the negative pole 32.

[0136] Example 4

[0137] As Figures 9 to 11 shown in the figure, there are two positive poles 31 and two negative poles 32 provided on the battery cell body 221. The two positive poles 31 are located on the left side of the two negative poles 32. The four poles 33 are spaced apart along the first direction. The direction of the charging current is as Figure 11 shown in the figure.

[0138] Example 5

[0139] As Figures 11 to 14 shown in the figure, the number of battery cell bodies 221 is two, which are divided into a first battery cell body and a second battery cell body. The first battery cell body is located on the left side of the second battery cell body. The first battery cell body is provided with a first pole group, and both the positive pole 31 and the negative pole 32 of the first pole group are provided on the upper side of the first battery cell body. The second battery cell body is provided with a second pole group, and both the positive pole 31 and the negative pole 32 of the second pole group are provided on the upper side of the second battery cell body. Taking the first battery cell body as an example, as Figure 14 shown in the figure, the charging current flows from the positive pole 31 into the interior of the first battery cell body and then flows to the negative pole 32.

[0140] Example 6

[0141] As Figures 15 to 17 shown in the figure, there is a pole group 3 provided on the battery cell body 221. The positive pole 31 is located on the upper side of the battery cell body 221, and the negative pole 32 is located on the lower side of the battery cell body 221. That is, an asymmetrical single-pole 33 design is adopted. As Figure 17 shown in the figure, the charging current flows from the positive pole 31 into the interior of the battery cell body 221 and then flows to the negative pole 32.

[0142] Example 7

[0143] As Figures 18 to 21As shown, two pole groups 3 are provided on the battery cell body 221. The positive pole columns 31 of each pole group 3 are located on the upper side of the battery cell body 221, and the negative pole columns 32 of each pole group 3 are located on the lower side of the battery cell body 221. That is to say, a design of double pole columns 33 on different sides is adopted. As Figure 21 shown, the charging current flows from the positive pole column 31 into the interior of the battery cell body 221 and then flows to the negative pole column 32.

[0144] Embodiment Eight

[0145] As Figures 22 to 24 shown, the number of battery cell bodies 221 is two, which are divided into a first battery cell body and a second battery cell body. The first battery cell body is located on the left side of the second battery cell body. The first battery cell body is provided with two first pole groups. The positive pole columns 31 of each first pole group are arranged on the upper side of the first battery cell body, and the negative pole columns 32 are arranged on the lower side of the first battery cell body. The positive pole columns 31 of each second pole group are arranged on the upper side of the second battery cell body, and the negative pole columns 32 are all arranged on the lower side of the second battery cell body. Along the length direction of the single battery 2, they are like-pole columns 33. Taking the first battery cell body as an example, as Figure 24 shown, the charging current flows from the positive pole column 31 into the interior of the first battery cell body and then flows to the negative pole column 32.

[0146] In summary, according to the pole column 33, the single battery 2 and the battery pack 1000 of the embodiments of the present application, by adopting a new structure of the pole column 33 and a heat dissipation component design that cooperates with a high heat dissipation path, the high-rate fast charging ability is improved. Different from the traditional two-pole column battery cell with one positive and one negative on the side, the present application adopts a sheet-shaped lead-out pole column 33, which greatly utilizes the space of the cover plate 212, increases the heat dissipation area of the current collector 222, reduces the current conduction path, reduces the heat generation impedance, and improves the fast charging ability of the battery cell; in one embodiment, the cover plate and the side plate are designed with crimping or local thickening to achieve a reliable connection of the thin cover plate; in another embodiment, combined with a high heat dissipation design, such as setting coolers on both sides, the heat transfer member 46 cooperating with the cooler, and the high thermal conductivity material taking away the temperature rise of the pole column 33 in all directions, the fast charging ability of the power battery is improved as a whole.

[0147] The present application also proposes a vehicle, which includes the battery pack 1000 of any of the above embodiments. Since the battery pack 1000 has a good heat dissipation effect and improves the fast charging ability, the vehicle of the present application also has the advantage of high fast charging ability, which will not be elaborated here.

[0148] Although some specific embodiments of the present application have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A battery pack, characterized in that, The battery pack includes single cells, and the single cell includes: A housing which defines an accommodation space therein. The housing has edges extending in 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 housing has at least a first surface, a second surface, and a third surface. The first surface is connected to the second surface, and the first surface is parallel to the third plane, the second surface is parallel to the second plane, and the third surface is parallel to the first plane. The surface area of the second surface is larger than that of the first surface. A battery core disposed in the accommodation space. A plurality of pole columns disposed on the battery core and protruding from the second surface of the housing. At least one of the pole columns is a sheet-like body. A cooler disposed on a side of the pole column away from the second surface and in thermal conduction with the pole column and the second surface respectively. A heat transfer member including a first heat conducting member. The first heat conducting member is disposed on the second surface and in heat transfer with the pole column and the cooler respectively. The heat transfer member further includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence. The first connecting portion, the second connecting portion, and the third connecting portion cooperate to form a receiving groove for receiving the first heat conducting member. A second heat conducting member located between the cooler and the third connecting portion and in thermal conductive connection with the cooler and the third connecting portion respectively.

2. The battery pack according to claim 1, characterized in that, The number of the coolers is two, and the single cell is located between the two coolers.

3. The battery pack according to claim 1, characterized in that, In the third direction, the number of the pole columns is multiple, and adjacent two pole columns are respectively connected to one heat conducting member.

4. The battery pack according to claim 3, characterized in that, The first connecting portion is connected to one of the two pole columns, the second connecting portion is connected to the other of the two pole columns, the third connecting portion is located between the first connecting portion and the second connecting portion, and the third connecting portion is connected to the first connecting portion and the second connecting portion respectively.

5. The battery pack according to claim 1, characterized in that, The cooler is provided with a second fluid passage for the cooling fluid to flow through, and the cooler is in thermal conductive connection with the heat transfer member.

6. The battery pack according to claim 1, characterized in that, The pole column is parallel to the first plane.

7. The battery pack according to claim 1, characterized in that, The housing includes: Side plates having the first surface and the third surface. A cover plate disposed on the side plates and enclosing the accommodation space with the side plates. The cover plate is provided with a through mounting hole through which the pole column passes. The side plates include: A first side portion extending along the second direction. A second side portion extending along the first direction. The first end of the second side portion is connected to the end of the first side portion in the second direction, the second end of the second side portion extends in a direction away from the first side portion, and the second side portion is connected to the cover plate.

8. The battery pack according to claim 7, characterized in that, The side plates further include: The third side portion, a first end of the third side portion is connected to a second end of the second side portion, a second end of the third side portion extends towards the direction where the first side portion is located, and in the first direction, the third side portion and the second side portion are stacked.

9. The battery pack according to claim 7, characterized in that, A stepped portion is provided on a side of the cover plate close to the accommodation space. In the first direction, the cover plate includes a first side surface and a second side surface that are spaced apart. The first side surface abuts against an edge of the cover plate. The thickness of the position on the cover plate corresponding to the first side surface is less than the thickness of the position on the cover plate corresponding to the second side surface. An end surface of the side plate in the first direction is connected to the first side surface.

10. A vehicle, characterized in that, Including the battery pack according to any one of claims 1-9.

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