Single-cell batteries, battery packs, and automotive applications.

Abstract

Invention details;

Description

Cells, battery packs, and vehicles

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number: 202211003310.X and application date of August 19, 2022, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular, to a single cell battery, a battery pack using the single cell battery, and a vehicle having the battery pack. Background Art

[0004] The battery tabs in the prior art use traditional tabs, which are structures arranged at the wide side ends of the pole pieces. The length of the long side ends of the tabs is shorter than the length of the wide side ends, and the area is limited, which makes the flow area of ​​the tabs and the poles small, resulting in limited fast charging capability of the battery.

[0005] Summary of the Invention

[0006] One purpose of the present application is to provide a single cell battery that can solve the technical problem in the prior art that batteries using traditional tabs have limited fast charging capabilities.

[0007] According to a first aspect of the present application, a single cell battery is provided, comprising: a shell defining a housing space; a pole piece located in the housing space, the pole piece having at least a first surface and a second surface; a pole tab and a current collecting member, the pole tab being provided on the pole piece, the pole tab comprising a first segment and a second segment connected to each other, the first segment extending from the first surface to the pole piece, the current collecting member being provided on the first segment, and the second segment extending from the second surface to the pole piece, so that current is transmitted between the second segment and the second surface; a pole post, the pole post being provided on the current collecting member and extending from the shell.

[0008] In the present application, at least one pole is a plate-shaped body.

[0009] In the present application, the pole piece 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.

[0010] In the present application, the surface area of ​​the second surface is greater than the surface area of ​​the first surface.

[0011] In the present application, the pole includes a positive pole and a negative pole, the second segment corresponding to the positive pole is located at one end of the pole piece in the second direction, and the second segment corresponding to the negative pole is located at the other end of the pole piece in the second direction.

[0012] In the present application, the pole includes a positive pole and a negative pole, the second segment corresponding to the positive pole and the second segment corresponding to the negative pole are located at the same end of the pole piece in the second direction, and are spaced apart and distributed in the first direction.

[0013] In the present application, the positive electrode column and the negative electrode column are located at the same end of the electrode sheet in the first direction.

[0014] In the present application, the positive electrode column is located at one end of the pole piece in the first direction, and the negative electrode column is located at the other end of the pole piece in the first direction.

[0015] In the present application, a single battery includes a pole piece group, the battery cell includes a pole piece group, the pole piece group includes a plurality of pole pieces arranged in a stacked manner, the pole pieces include a positive pole piece and a negative pole piece; a pole tab group, the pole tab group includes a positive pole tab and a negative pole tab, the positive pole tab is electrically connected to the positive pole piece, and the negative pole tab is electrically connected to the negative pole piece; a current collector group, the current collector group includes a positive current collector and a negative current collector, the positive current collector is connected to the positive pole tab, and the negative current collector is connected to the negative pole tab; a pole post group, the pole post group includes two pole posts, the two pole posts are respectively a positive pole post connected to the positive current collector and a negative pole post connected to the negative current collector.

[0016] In the present application, a plurality of the electrode groups are provided, and each of the electrode groups is provided with a tab group, a current collecting member group and a pole group.

[0017] In the present application, a plurality of the pole group, the tab group, and the current collecting member group are provided, and a plurality of the pole groups are adapted to be mounted on one pole piece group.

[0018] According to the second aspect of the present application, a battery pack is also provided, comprising: a single cell, wherein the single cell is any of the single cells described above; and a heat transfer element, wherein the heat transfer element can transfer heat on the single cell close to the first surface to the outside of the shell corresponding to the second surface.

[0019] In the present application, the heat transfer element includes: a heat conductive element, which is provided on the shell and thermally connected to the pole, and the heat conductive element extends toward the position of the shell corresponding to the second surface.

[0020] In the present application, there are a plurality of single cells, and the heat conducting members are respectively connected to the poles of two adjacent single cells in a heat-conducting manner.

[0021] In the present application, 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.

[0022] In the present application, the radiator includes at least one tubular member having a first fluid passage therein for the flow of a cooling fluid, and a portion of the tubular member forms at least a portion of the heat transfer element.

[0023] In the present application, the battery pack further includes: a cooler, which is thermally connected to the shell corresponding to the second surface.

[0024] In the present application, a second fluid channel is provided in the cooler for cooling fluid to flow, and the cooler is thermally connected to the heat transfer element.

[0025] In the present application, there are two coolers, and the single battery is located between the two coolers.

[0026] According to a second aspect of the present application, a vehicle is provided, comprising a battery pack according to any one of the above embodiments.

[0027] According to one embodiment of the present disclosure, a single cell is mainly composed of a shell, a pole piece, a pole lug, a current collector and a pole column, wherein the pole lug including the first section and the second section is a bent part, so that a part of the pole lug extends along the first direction of the pole piece to increase the contact range with the pole piece, and the other part extends along the second direction of the pole piece to connect with the corresponding current collector. Specifically, by bending the pole lug to form the first section, the current of the pole piece can be led out laterally, and by bending the pole lug to form the second section, it is convenient to connect the pole lug to the current collector, so that the current collector and the first section can be arranged in two directions of the pole piece group to control the direction of the current. In the single cell in the present application, by adopting a structure in which the pole lug is pushed out and the pole column is pulled out sideways, the current conduction path is reduced, the current flow capacity of the current collector at the lead-out position of the single cell is increased, and the fast charging capability of the single cell is improved.

[0028] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0030] FIG1 is a partial exploded view of a single cell according to Example 1 of the present application;

[0031] FIG2 is a schematic diagram of the internal structure of a single cell according to Example 1 of the present application;

[0032] FIG3 is a schematic diagram of current flow of a single cell according to Example 1 of the present application;

[0033] FIG4 is a partial exploded view of a single cell according to Example 2 of the present application;

[0034] FIG5 is a schematic diagram of the internal structure of a single cell according to Example 2 of the present application;

[0035] FIG6 is a partial exploded view of a single cell according to Example 2 of the present application;

[0036] FIG7 is a schematic diagram of current flow of a single cell according to Example 2 of the present application;

[0037] FIG8 is a partial exploded view of a single cell according to Example 3 of the present application;

[0038] FIG9 is a schematic diagram of the internal structure of a single cell according to Example 3 of the present application;

[0039] FIG10 is a schematic diagram of current flow of a single cell according to Example 3 of the present application;

[0040] FIG11 is a partial exploded view of a single cell according to Example 4 of the present application;

[0041] FIG12 is a schematic diagram of the internal structure of a single cell according to the fourth embodiment of the present application;

[0042] FIG13 is a schematic diagram of current flow of a single cell according to the fourth embodiment of the present application;

[0043] FIG14 is a schematic diagram of the assembly of a pole and a current collecting member according to an embodiment of the present application;

[0044] FIG15 is a schematic diagram of the assembly of a single battery and a heat dissipation assembly according to an embodiment of the present application;

[0045] FIG16 is a partial exploded view of a battery pack according to another embodiment of the present application;

[0046] FIG17 is a schematic diagram of the assembly of a single battery and an explosion-proof valve according to an embodiment of the present application;

[0047] FIG18 is a schematic structural diagram of a connector according to an embodiment of the present application at one angle;

[0048] FIG19 is a structural schematic diagram of a connector according to another embodiment of the present application from another angle;

[0049] FIG20 is a schematic diagram of the cooperation between the second heat conducting member and two single cells according to an embodiment of the present application;

[0050] FIG21 is an enlarged view of the circled area A in FIG20.

[0051] Figures and symbols: Battery pack 1000; explosion-proof valve 1; exhaust direction 11; single battery 2; shell 21; side plate 211; cover plate 212; pole piece 20; pole piece group 221; third surface 2211; second surface 2212; first surface 2213; current collector 222; positive electrode post 31; negative electrode post 32; pole post 33; first connecting section 331; second connecting section 332; heat transfer member 40; heat conductor 401; cooler 402; first cooler 41; second cooler 42; first heat conductor 43; second heat conductor 44; radiator 45; connecting member 46; first connecting part 461; second connecting part 462; third connecting part 463; fourth connecting part 464; tab 50; positive electrode tab 51; negative electrode tab 52; first segment 532; second segment 531. DETAILED DESCRIPTION

[0052] 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 numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0053] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0054] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0055] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0056] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0057] The following describes a single cell 2 according to an embodiment of the present application with reference to the accompanying drawings.

[0058] As shown in FIG. 1 to FIG. 21 , the single battery 2 according to the embodiment of the present application includes a housing 21 , a pole piece 20 , a pole tab 50 , a current collecting member 222 and a pole post 33 .

[0059] Specifically, a housing space is defined within the shell 21, and the pole piece 20 is located in the housing space. The pole piece 20 has at least a first surface 2213 and a second surface 2212. The pole ear 50 is provided on the pole piece 20, and the pole ear 50 includes a first segment 532 and a second segment 531 connected to each other. The first segment 532 extends from the first surface 2213 to the pole piece 20. The current collecting piece 222 is provided on the first segment 532, and the second segment 531 extends from the second surface 2212 to the pole piece 20, so that current is transmitted between the second segment 531 and the second surface 2212. The pole is provided on the current collecting piece 222 and extends out of the shell 21.

[0060] In other words, the single cell 2 according to the embodiment of the present application mainly consists of a housing 21, a pole piece 20, a pole tab 50, a current collector 222, and a pole post 33. The housing 21 has a receiving space, which has an accommodating function and can be used to accommodate and install the pole piece 20, etc.

[0061] The outer surface of the electrode 20 includes at least a first surface 2213 and a second surface 2212, with the electrode tab 50 disposed at the edge of the electrode 20. Specifically, the electrode tab 50 includes a first segment 532 and a second segment 531 connected to each other. The first segment 532 is located on the first surface 2213 and extends from the electrode 20, while the second segment 531 is located on the second surface 2212 and extends from the electrode 20. Furthermore, the first segment 532 is connected to the current collector 222, allowing current to flow between the second segment 531 and the second surface 2212. It should be noted that the direction of current transmission is not limited herein and can flow from the second surface 2212 to the second segment 531 or from the second segment 531 to the second surface 2212. Furthermore, current can flow from the second segment 531 to the first segment 532 or from the first segment 532 to the second segment 531, without limitation.

[0062] Thus, the single cell 2 according to the embodiment of the present application is mainly composed of a housing 21, a pole piece 20, a pole tab 50, a current collector 222, and a pole post. The pole tab 50, including the second segment 531 and the first segment 532, is a bent piece, so that a portion of the pole tab 50 extends along the first direction of the pole piece 20 to increase the contact range with the pole piece 20, and the other portion extends along the second direction of the pole piece 20 to connect with the corresponding current collector 222. Specifically, by bending the pole tab 50 to form the second segment 531, the current of the pole piece 20 can be side-guided, and by bending the pole tab 50 to form the first segment 532, it is convenient to connect the pole tab 50 with the current collector 222, and the current collector 222 and the second segment 531 can be arranged in two directions of the pole piece group 221 to control the direction of current. In the single cell 2 of the present application, by adopting a structure in which the tab 50 is pushed out and the pole 33 is side-out, the current conduction path is reduced, the current flow capacity of the current collector 222 at the lead-out position of the single cell 2 is increased, and the fast charging capability of the single cell 2 is improved. Specifically, the pole 33 is side-out when it is led out from the end of the pole piece in the first direction, and the tab 50 is pushed out when a portion of it is provided at the end of the pole piece 20 in the second direction.

[0063] It should be noted that, since a single cell 2 can have multiple electrode sheets 20, for ease of explanation, it can be defined that a single cell 2 has an electrode sheet group 221, a tab group, a current collector group, and a pole column group. Among them, the electrode sheet group 221 includes a plurality of stacked electrode sheets 20, and the electrode sheets 20 can be divided into positive electrode sheets and negative electrode sheets. For example, the electrode sheet group 221 includes a plurality of stacked positive electrode sheets-diaphragms-negative electrode sheets. The tab group includes a plurality of tabs, and the tabs can be positive electrode tabs 51 or negative electrode tabs 52. For example, the number of tabs 50 is two, divided into a positive electrode tab 51 and a negative electrode tab 52. The positive electrode tab 51 is electrically connected to the positive electrode sheet, and the negative electrode tab 52 is electrically connected to the negative electrode sheet. The current collector assembly includes multiple current collectors 222, which are divided into positive and negative current collectors. The positive current collector is connected to the positive electrode tab 51, and the negative current collector is connected to the negative electrode tab 52. The electrode assembly extends out of the accommodation space and includes two electrodes 33, one of which is a positive electrode 31 connected to the positive current collector and the other is a negative electrode 32 connected to the negative current collector, allowing the electrodes 33 to be sideways.

[0064] Optionally, at least one of the multiple tabs includes a first segment 532 and a second segment 531 that are connected to each other. That is, in one tab group, only the positive tab 51 may include the first segment 532 and the second segment 531, or only the negative tab 52 may include the first segment 532 and the second segment 531, or both the positive tab 51 and the negative tab 52 may include the first segment 532 and the second segment 531, which is not limited here.

[0065] According to one embodiment of the present application, at least one pole 33 is a sheet-shaped body. By adopting the sheet-shaped pole 33, not only the area of ​​the pole 33 can be increased, but also the flow area of ​​the current collector 222 can be increased, which is conducive to achieving fast charging.

[0066] Optionally, as shown in Figure 14, at least one pole 33 includes a first connecting section 331 and a second connecting section 332, the first connecting section 331 is used to connect to the current collecting piece 222, the second connecting section 332 is connected to the first connecting section 331, and the second connecting section 332 is used to connect to an external electrical device, and the first connecting section 331 and / or the second connecting section 332 are sheet-like bodies.

[0067] In other words, the electrode 33 is mainly composed of a first connecting section 331 and a second connecting section 332, wherein the first connecting section 331 and the second connecting section 332 are connected separately. The first connecting section 331 can be used to connect to the current collector 222, for example, the positive electrode current collector or the negative electrode current collector. It should be noted that the tab 50 of the present application can be used to combine the positive and negative electrode foils. The current collector 222 can be a structure formed by welding the tab 50. In this case, the current collector 222 and the tab 50 can be two different states of the same material. It should be noted that whether the tab 50 and the current collector 222 are provided separately or the tab 50 and the current collector 222 are the same structure, they fall within the scope of protection of this application.

[0068] Specifically, 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 to the left 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. The left end of the first connecting segment 331 can be connected to the right end of the second connecting segment 332, and the left end of the second connecting segment 332 can be connected to an external electrical device.

[0069] It should be noted that 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 but is not limited to 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.

[0070] Conventional poles in the prior art are cylindrical and located at the ends of battery cells. Their diameter needs to be smaller than the thickness of the cell, and the surface area of ​​the pole is related to its diameter, resulting in a smaller surface area. In contrast, at least a portion of the pole 33 in this embodiment is a sheet-like structure. The sheet is thinner, and the dimensions of the sheet in multiple directions can vary. For example, even if the sheet's thickness is smaller than the cell's thickness, the sheet can be expanded in other directions to increase the total area of ​​the pole 33. For example, when the sheet's thickness is oriented in the front-to-back direction, the sheet can be expanded in both the length and width directions. When at least the first connecting section 331 is a sheet-like structure, not only can the area of ​​the pole 33 be increased, but the flow area of ​​the current collector 222 can also be increased. Increasing the area of ​​the pole 33 improves heat dissipation, and increasing the flow area reduces heat generation, thereby resolving the technical issue of the limited fast-charging capability of batteries with conventional poles 33 in the prior art.

[0071] In this embodiment, the pole 33 is primarily composed of a first connecting section 331 and a second connecting section 332. The first connecting section 331 and / or the second connecting section 332 utilize a sheet-like structure to increase their area. When the first connecting section 331 utilizes a sheet-like structure, the flow area of ​​the current collector 222 can also be increased. Increasing the area of ​​the pole 33 facilitates rapid heat dissipation from the pole 33, and by increasing the flow area, heat generation is reduced, thereby improving the charging efficiency of the single battery 2 and achieving rapid charging.

[0072] According to one embodiment of the present application, at least one pole 33 is an integrally formed part. That is, the pole 33 can be manufactured through an integral molding process, such as stamping, and includes both a first connecting section 331 and a second connecting section 332. In this embodiment, the use of an integrally molded pole 33 facilitates processing and production, and the step of connecting the first connecting section 331 and the second connecting section 332 can be omitted.

[0073] In some specific embodiments of the present application, at least one pole 33 is a rectangular piece, that is, the first connecting section 331 and the second connecting section 332 can be combined to form a rectangular piece, and the rectangular piece is a plate-shaped piece. That is, the first connecting section 331 and the second connecting section 332 can extend along the same plane, for example, the first connecting section 331 is located on the left side of the second connecting section 332, and the first connecting section 331 and the second connecting section 332 extend in the horizontal direction respectively and are located on the same horizontal plane. In this embodiment, by adopting a pole 33 with a rectangular structure, it is beneficial to connect the pole 33 with the current collector 222 and external electrical equipment. For example, one side of the rectangular piece is connected to the current collector 222 to ensure a sufficiently large flow area. In addition, by adopting a rectangular piece, it is beneficial to increase the area of ​​the pole 33 and the flow area of ​​the current collector 222 at the same time, thereby further improving the fast charging capability of the single cell 2.

[0074] Furthermore, as shown in FIG14 , 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, when the pole 33 extends horizontally, the spacing between the upper surface and the lower surface 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.

[0075] In some specific embodiments of the present application, as shown in Figures 1 and 11, the pole piece 20 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 2213 is connected to the second surface 2212, and the first surface 2213 is parallel to the third plane, and the second surface 2212 is parallel to the second plane. Since the first segment 532 extends from the first surface 2213 and the second segment 531 extends from the second surface 2212, the first segment 532 is located at the end of the pole piece group 221 in the first direction and can be insulated from the pole piece group 221, and the second segment 531 is located at the end of the pole piece group 221 in the second direction and can be electrically connected to the pole piece 20.

[0076] Taking the positive electrode tab 51 including the second segment 531 and the first segment 532 as an example, the length direction of the electrode sheet 20 is defined as the first direction, and the height direction of the electrode sheet is defined as the second direction. The first direction extends horizontally, and the second direction extends vertically. The second segment 531 is located above or below the electrode assembly 221, and the first segment 532 is located on the left or right side of the electrode assembly 221, thereby achieving the ejection of the tab 50. The structure of the tab 50 being ejected can also increase the flow area of ​​the tab 50. For example, the upper end of the positive electrode tab is connected to the second segment 531, the left end of the second segment 531 is connected to the upper end of the first segment 532, and the lower end of the first segment 532 is connected to the positive electrode current collector located at the left end of the positive electrode tab.

[0077] Furthermore, the second segment 531 and / or the first segment 532 are sheet-like structures having a large surface and a small surface, with the large surface being larger than the small surface. The sheet-like structure facilitates bending, installation, and positioning of the tab 50. It also provides a flat, large large surface for connection to multiple pole pieces 20.

[0078] It should be noted that when the pole 33 is located at the end of the pole piece group 221 in the first direction, the explosion-proof valve 1 can be designed at the end of the pole piece group 221 in the second direction, or at the end in the third direction, where the third direction can be different from the first direction and the second direction. For example, any two of the first direction, the second direction, and the third direction are perpendicular to each other, the first direction extends in the left-right direction, the second direction extends in the up-down direction, and the third direction extends in the front-to-back direction. In this embodiment, by arranging the explosion-proof valve 1 at the end of the pole piece group 221 in the second direction, more space can be reserved for the sheet-shaped pole 33 of the present application, thereby facilitating further expansion of the area of ​​the pole 33. In addition, the size of the explosion-proof valve 1 can be increased based on the space in the second and third directions of the pole piece group 221, and the number of explosion-proof valves 1 can be increased, thereby improving the system thermal safety of the battery pack 1000.

[0079] According to one embodiment of the present application, the length of the pole 33 extends along the second direction, and the width of the pole 33 extends along the first direction. For example, the sheet-shaped pole 33 extends generally in the left-right direction, and the pole group also extends generally in the left-right direction, with the two being generally parallel to each other. In this embodiment, by limiting the extension direction of the pole 33, the processing and assembly of the pole 33 is facilitated, as well as heat dissipation of the sheet-shaped pole 33.

[0080] According to one embodiment of the present application, as shown in Figures 1, 4, 8 and 11, the outer surface of the pole piece 20 includes two third surfaces 2211, two second surfaces 2212 and two first surfaces 2213. The two third surfaces 2211 are spaced apart along the third direction, the length direction of each third surface 2211 extends along the first direction, and the height direction of each third surface 2211 extends along the second direction; the two second surfaces 2212 are spaced apart along the second direction, and each second surface 2212 is respectively connected to the two third surfaces 2211 at both ends in the third direction; the two first surfaces 2213 are spaced apart along the first direction, and each first surface 2213 is respectively connected to the two second surfaces 2212 at both ends in the second direction. Among them, the first segment 532 is provided on the first surface 2213, and the second segment 531 is provided on the second surface 2212.

[0081] For example, the pole piece 20 is a rectangular sheet, and the length direction of the pole piece 20 is defined as the first direction, the height direction of the pole piece 20 is defined as the second direction, and the thickness direction of the pole piece 20 is defined as the third direction. The first direction can extend in the left-right direction, the second direction can extend in the upward direction, and the third direction can extend in the front-back direction. Since the pole piece group 221 is formed by stacking the pole pieces 20, the length direction, height direction and thickness direction of the pole piece 20 are the length direction, height direction and thickness direction of the pole piece group 221, which are not described here. The outer surface of the pole piece 20 is composed of a third surface 2211, a second surface 2212 and a first surface 2213, wherein the number of the third surface 2211, the second surface 2212 and the first surface 2213 are two respectively. Specifically, the two third surfaces 2211 are spaced apart and distributed in the front-back direction, the height direction of each third surface 2211 extends up and down, and the length direction of each third surface 2211 extends left and right. The two second surfaces 2212 are spaced apart in the vertical direction, with one second surface 2212 located above the third surface 2211 and the other second surface 2212 located below the third surface 2211. The front and rear ends of each second surface 2212 are respectively connected to the third surface 2211. The two first surfaces 2213 are spaced apart in the left and right direction, with the front and rear ends of each first surface 2213 respectively connected to the two third surfaces 2211, and the upper and lower ends are respectively connected to the second surface 2212. At this time, the first segment 532 is provided on the first surface 2213, and the second segment 531 is provided on the second surface 2212. That is, the tab 50 is bent to form an "L"-shaped structure. The first segment 532 is insulated from the pole piece 20, and the second segment 531 is electrically connected to the pole piece 20 on the second surface 2212.

[0082] It should be noted that the second surface 2212 and the first surface 2213 corresponding to the electrode group 221 can be continuous surfaces or discontinuous surfaces, depending on the specific settings of the positive electrode sheet, the negative electrode sheet and the diaphragm. As long as the positive electrode sheet on the same side of the electrode group 221 can be electrically connected to the second segment 531, or the negative electrode sheet on the same side of the electrode group 221 can be electrically connected to the first segment 532, it falls within the scope of the concept of this application.

[0083] In this embodiment, by limiting the shapes of the pole piece 20 and the pole piece group 221 , it can be seen that the bent pole ear 50 of the present application can be applied to the existing pole piece group 221 , which is beneficial to realize the side current extraction.

[0084] According to one embodiment of the present application, along the first direction, the length of the second segment 531 is no greater than the length of the electrode assembly 221. For example, the first end of the second segment 531 extends along the first direction, and the second end of the second segment 531 is connected to the upper end of the first segment 532, and the first segment 532 extends along the second direction. Along the first direction, the first end of the second segment 531 can be flush with the end of the electrode assembly, or shorter than the end of the electrode assembly. In other words, the lengths of the first segment 532 and the second segment 531 can be designed according to specific needs. As long as the structure that can realize the protrusion of the electrode tab 50 is achieved, it falls within the scope of the present application.

[0085] In some specific embodiments of the present application, the surface area of ​​the second surface 2212 is greater than the surface area of ​​the first surface 2213. For example, the size of the pole piece 20 in the first direction is greater than the size in the second direction, the pole group is arranged at the end of the pole piece group 221 in the first direction, the second segment 531 extends along the first direction and is located at the end of the pole piece group 221 in the second direction, and the first segment 532 extends along the second direction and is located at the end of the pole piece group 221 in the first direction. In other words, the pole piece 20 has a length direction and a height direction, the length direction can be used as the first direction, and the height direction can be used as the second direction, that is, the size in the height direction is smaller than the size in the length direction. When the first direction extends in the left-right direction and the second direction extends in the up-down direction, the pole group can be located on the left or right side of the pole piece group 221, the first segment 532 is also correspondingly located on the left or right side of the pole piece group 221, and the second segment 531 is located on the upper side or lower side of the pole piece group 221.

[0086] In this embodiment, by positioning the first segment 532 on the smaller first surface 2213 and the second segment 531 on the larger second surface 2212, and correspondingly, the pole group also corresponds to the first surface 2213, it is possible to avoid the space cramped in the height direction of the pole group 221 caused by positioning the pole group on the end portion extending in the second direction of the pole piece group 221, thereby reducing the range of the second direction dimensions of the pole piece group 221 and reducing the battery capacity. Furthermore, connecting the second segment 531 to the end portion extending in the first direction of the pole piece group 221 facilitates expanding the connection area between the second segment 531 and the pole piece 20, thereby expanding the range of current extraction. Furthermore, by aligning the second segment 531 with the larger second surface 2212, the current flow area of ​​the pole tab 50 can be further increased while achieving the ejection of the pole tab 50.

[0087] According to one embodiment of the present application, as shown in Figures 1 to 3, the positive electrode 31 of the electrode group is provided at one end of the electrode group 221 in the first direction, and the negative electrode 32 is provided at the other end of the electrode group 221 in the first direction. For example, if the first direction of the electrode group 221 extends in the left-right direction, the positive electrode 31 of one electrode group is located on the left side of the electrode group 221, and the negative electrode 32 of the electrode group is located on the right side of the electrode group 221. It should be noted that in this embodiment, one electrode group 221 is not limited to having one electrode group.

[0088] In some specific embodiments of the present application, as shown in Figures 1 to 3, the second segment 531 corresponding to the positive electrode post 31 is located at one end of the electrode assembly 221 in the second direction, and the second segment 531 corresponding to the negative electrode post 32 is located at the other end of the electrode assembly 221 in the second direction. For example, when the positive electrode post 31 of the electrode assembly is located at one end of the electrode assembly 221 in the first direction, and the negative electrode post 32 is located at the other end of the electrode assembly 221 in the first direction, the second segment 531 corresponding to the positive electrode post 31 is located at one end of the electrode assembly 221 in the second direction, and the second segment 531 corresponding to the negative electrode post 32 is located at the other end of the electrode assembly 221 in the second direction. When the first direction is the left-right direction and the second direction is the up-down direction, the second segment 531 corresponding to the positive electrode post 31 of a electrode assembly can be located above the electrode assembly 221, and the second segment 531 corresponding to the negative electrode post 32 of the electrode assembly can be located below the electrode assembly 221.

[0089] According to one embodiment of the present application, as shown in Figures 8 to 10, the second segment 531 corresponding to the positive electrode 31 and the second segment 531 corresponding to the negative electrode 32 are located at the same end of the electrode assembly 221 in the second direction and are spaced apart in the first direction. For example, when the positive electrode 31 of the electrode assembly is located at one end of the electrode assembly 221 in the first direction and the negative electrode 32 is located at the other end of the electrode assembly 221 in the first direction, the second segment 531 corresponding to the positive electrode 31 and the second segment 531 corresponding to the negative electrode 32 are located at the same end of the electrode assembly 221 in the second direction. When the first direction is the left-right direction and the second direction is the up-down direction, the second segment 531 corresponding to the positive electrode 31 and the second segment 531 corresponding to the negative electrode 32 of the same electrode assembly can be located simultaneously above or below the electrode assembly 221.

[0090] In some specific embodiments of the present application, as shown in FIG11 , the positive electrode 31 and the negative electrode 32 of the electrode group are located at the same end of the electrode group 221 in the first direction, the second segment 531 corresponding to the positive electrode 31 is located at one end of the electrode group 221 in the second direction, and the second segment 531 corresponding to the negative electrode 32 is located at the other end of the electrode group 221 in the second direction. In other words, the positive electrode 31 and the negative electrode 32 of a electrode group can be located at the same end of the electrode group 221 and at the same end of the electrode group 221 in the first direction. For example, the first direction extends in the left-right direction and the second direction extends in the up-down direction. In this case, the positive electrode 31 and the negative electrode 32 are simultaneously located on the left or right side of the electrode group 221. The second segment 531 corresponding to the positive electrode 31 can be located above the electrode group 221, and the second segment 531 corresponding to the negative electrode 32 can be located below the electrode group 221.

[0091] According to one embodiment of the present application, as shown in FIG11 , there are two electrode sets 221 , and the two electrode sets 221 are sequentially arranged along a first direction. Each electrode set 221 has at least one electrode column set. The second segments 531 corresponding to the positive electrode column 31 and the second segments 531 corresponding to the negative electrode column 32 of each electrode set 221 are spaced apart and arranged along a second direction. For example, the two electrode sets 221 are arranged in a left-right direction, with the positive electrode column 31 and the negative electrode column 32 of one electrode set disposed on the left side of one electrode set 221 away from the other electrode set 221, and the positive electrode column 31 and the negative electrode column 32 of the other electrode set disposed on the right side of the other electrode set 221. The second segments 531 corresponding to the positive electrode column 31 of the left electrode set 221 are located above the left electrode set 221 and extend in the left-right direction. The second segment 531 corresponding to the negative electrode post 32 of the electrode assembly 221 on the right side is located below the electrode assembly 221 on the right side and extends in the left-right direction.

[0092] In some specific embodiments of the present application, as shown in FIG4 , a pole piece group 221 is provided with a plurality of pole post groups, each pole post group corresponding to a current collector group and a pole lug group. It should be noted that in this embodiment, the number of pole piece groups 221 can be one or more. For example, when the number of pole piece groups 221 is one, a plurality of pole post groups can be provided on a pole piece group 221. For example, there are two pole post groups corresponding to a pole piece group 221. The positive pole posts 31 of the two pole post groups are located on the left side of the pole piece group 221 at the same time, and are spaced apart and distributed in the up and down directions. The negative pole posts 32 of the two pole post groups are located on the right side of the pole piece group 221 at the same time, and are spaced apart and distributed in the up and down directions. When the number of pole piece groups 221 is two, the two pole piece groups 221 can be distributed in sequence in the left and right directions, divided into a left pole piece group and a right pole piece group. The positive electrode post 31 of the left electrode group is located above the negative electrode post 32 of the left electrode group, and the negative electrode post 32 of the right electrode group is located above the negative electrode post 32 of the right electrode group.

[0093] According to one embodiment of the present application, as shown in FIG4 , the positive electrode 31 of each electrode group is located at one end of the electrode group 221 in the first direction, and the negative electrode 32 of each electrode group is located at the other end of the electrode group 221 in the first direction. The second segments 531 corresponding to the multiple positive electrode 31 are located at one end of the electrode group 221 in the second direction, and the second segments 531 corresponding to the multiple negative electrode 32 are located at the other end of the electrode group 221 in the second direction. In other words, when multiple electrode groups are provided on a single electrode group 221, the positive electrode 31 of each electrode group is located at one end of the electrode group 221 in the first direction, and the negative electrode 32 of each electrode group is located at the other end of the electrode group 221 in the first direction, thereby achieving opposite-side bipolarity. The second segments 531 corresponding to the multiple positive electrode 31 are located at one end of the electrode group in the second direction, and the second segments 531 corresponding to the multiple negative electrode 32 are located at the other end of the electrode group 221 in the second direction. For example, the first direction is the left-right direction, and the second direction is the up-down direction. Multiple pole groups are provided on a pole piece group 221, with the positive pole 31 of each pole group located on the left side of the pole group, and the negative pole 32 of each pole group located on the right side of the pole group. The second segments 531 corresponding to the positive pole 31 of each pole group are located on the upper side of the pole piece group 221 and can be arranged sequentially along the thickness direction of the pole piece group 221. The second segments 531 corresponding to the negative pole 32 of each pole group are located on the lower side of the pole piece group 221 and can be arranged sequentially along the thickness direction of the pole piece group 221.

[0094] In some specific embodiments of the present application, as shown in FIG5 , in the second direction, a second segment 531 located at the same end of the electrode assembly 221 is electrically connected to a portion of the electrode 20, and another second segment 531 is electrically connected to another portion of the electrode 20. For example, the second direction is the up-down direction, and the thickness direction of the electrode assembly 221 is the third direction. At least two second segments 531 are arranged sequentially along the thickness direction, with one second segment 531 electrically connected to a portion of the electrode 20 in the thickness direction, and the other second segment 531 electrically connected to another electrode 20 in the thickness direction.

[0095] According to one embodiment of the present application, as shown in FIG6 , in the second direction, at least two second segments 531 located at the same end of the pole piece group 221 have different lengths in the first direction. For example, the length of one second segment 531 along the first direction is L1, and the length of another second segment 531 along the first direction is L2, where L1<L2.

[0096] In some specific embodiments of the present application, along the thickness direction of the electrode group 221, the two electrode ears 50 can be parallel or staggered. For example, the two second segments 531 are located on the same straight line along the first direction, that is, on the same straight line in the thickness direction, to achieve parallelism in the thickness direction; or the two second segments 531 are located on different straight lines along the first direction, that is, on two straight lines in the thickness direction, to achieve staggering in the thickness direction.

[0097] The single cell 2 of the present application is described in detail below with reference to specific embodiments.

[0098] Example 1

[0099] As shown in Figures 1 to 3, there is one electrode assembly 221, which is a long strip. The length direction of the electrode assembly 221 extends in the left-right direction, that is, the left-right direction is defined as a first direction. The height direction of the electrode assembly 221 extends in the up-down direction, that is, the up-down direction is defined as a second direction. The thickness direction of the electrode assembly 221 extends in the front-to-back direction, that is, the front-to-back direction is defined as a third direction.

[0100] The electrode group includes a positive electrode 31 and a negative electrode 32. The positive electrode 31 is located on the left side of the electrode group 221, and the negative electrode 32 is located on the right side of the electrode group 221. The positive current collector is located on the left side of the electrode group 221, and the negative current collector is located on the right side of the electrode group 221. The positive current collector is connected to the positive electrode 31, and the negative current collector is connected to the negative electrode 32.

[0101] The positive electrode tab 51 corresponding to the positive electrode column 31 includes a second segment 531 and a first segment 532. The second segment 531 of the positive electrode tab 51 is located below the electrode group 221 and extends in the left-right direction. The first segment 532 of the positive electrode tab 51 is located on the left side of the electrode group 221 and extends in the up-down direction.

[0102] The negative electrode tab 52 corresponding to the negative electrode post 32 includes a second segment 531 and a first segment 532. The second segment 531 of the negative electrode post 32 is located above the electrode assembly 221 and extends in the left-right direction. The first segment 532 of the negative electrode tab 52 is located on the right side of the electrode assembly 221 and extends in the up-down direction.

[0103] In other words, the first embodiment adopts a structure design in which the opposite-side monopole tab is pushed out and bent, and the single-side monopole column 33 is used. The current conduction path is shown in FIG3 .

[0104] Example 2

[0105] As shown in Figures 4 to 7, there is one electrode assembly 221, which is a long strip. The length direction of the electrode assembly 221 extends in the left-right direction, that is, the left-right direction is defined as a first direction. The height direction of the electrode assembly 221 extends in the up-down direction, that is, the up-down direction is defined as a second direction. The thickness direction of the electrode assembly 221 extends in the front-to-back direction, that is, the front-to-back direction is defined as a third direction.

[0106] There are two electrode groups, including a first electrode group and a second electrode group. Each electrode group includes a positive electrode 31 and a negative electrode 32. Each positive electrode 31 is located to the left of the electrode group 221, and each negative electrode 32 is located to the right of the electrode group 221. Each positive current collector is located to the left of the electrode group 221, and each negative current collector is located to the right of the electrode group 221. The positive current collector is connected to the corresponding positive electrode 31, and the negative current collector is connected to the corresponding negative electrode 32.

[0107] The positive electrode tab 51 corresponding to each positive electrode post 31 includes a second segment 531 and a first segment 532. The positive electrode post 31 of the first electrode group is located above the positive electrode post 31 of the second electrode group. The first segment 532 corresponding to the positive electrode post 31 of the first electrode group is located to the left of the electrode sheet assembly 221. The second segment 531 corresponding to the positive electrode post 31 of the first electrode group is located above the electrode sheet assembly 221. The second segment 531 corresponding to the positive electrode post 31 of the first electrode group is located behind the second segment 531 corresponding to the positive electrode post 31 of the second electrode group. The first segment 532 corresponding to the positive electrode post 31 of the first electrode group is connected to the top of one positive current collector in the vertical direction, and the first segment 532 corresponding to the positive electrode post 31 of the second electrode group is connected to the end of the other positive current collector in the front-to-back direction.

[0108] The negative electrode tab 52 corresponding to each negative electrode post 32 includes a second segment 531 and a first segment 532. The negative electrode posts 32 of the first electrode group are located above the negative electrode posts 32 of the second electrode group. The first segment 532 corresponding to the negative electrode posts 32 of the first electrode group is located to the right of the electrode sheet assembly 221, and the second segment 531 corresponding to the negative electrode posts 32 of the first electrode group is located below the electrode sheet assembly 221. The second segment 531 corresponding to the negative electrode posts 32 of the first electrode group is located in front of the second segment 531 corresponding to the negative electrode posts 32 of the second electrode group. The first segment 532 corresponding to the negative electrode posts 32 of the first electrode group is connected to the end of one negative electrode current collector in the front-to-back direction, while the first segment 532 corresponding to the negative electrode posts 32 of the second electrode group is connected to the bottom of the other negative electrode current collector in the top-to-bottom direction.

[0109] In other words, the second embodiment adopts a design in which the multiple tabs 50 on opposite sides are pushed out and bent, and the multiple pole posts 33 on one side are of the same sex. When the height of the single battery 2 is high, the number of pole posts 33 can be adjusted according to the actual designable size of the pole posts 33. The current conduction path is shown in FIG7.

[0110] Example 3

[0111] As shown in Figures 11 to 13, there are two electrode groups 221, which are divided into a first electrode group 221 and a second electrode group 221. Each electrode group 221 is provided with a pole group and a tab group. The first electrode group 221 and the second electrode group 221 extend in the left-right direction. The positive electrode 31 and the negative electrode 32 of the first electrode group 221 are arranged on the left side of the first electrode group 221, and the positive electrode 31 is located above the negative electrode 32. Similarly, the positive electrode 31 and the negative electrode 32 of the second electrode group 221 are arranged on the right side of the second electrode group 221, and the positive electrode 31 is located above the negative electrode 32.

[0112] For the first electrode assembly 221, the lower end of the first segment 532 corresponding to the positive electrode post 31 is connected to the positive electrode current collector. The first segment 532 extends upward, and the left end of the second segment 531 is connected to the first segment 532. The second segment 531 is located above the first electrode assembly 221 and extends to the right. The upper end of the first segment 532 corresponding to the negative electrode post 32 is connected to the negative electrode current collector. The first segment 532 extends downward, and the left end of the second segment 531 is connected to the lower end of the first segment 532. The second segment 531 is located below the first electrode assembly 221 and extends to the right.

[0113] For the second electrode assembly 221, the lower end of the first segment 532 corresponding to the positive electrode post 31 is connected to the positive electrode current collector. The first segment 532 extends upward, and the right end of the second segment 531 is connected to the upper end of the first segment 532. The second segment 531 is located above the first electrode assembly 221 and extends to the left. The upper end of the first segment 532 corresponding to the negative electrode post 32 is connected to the negative electrode current collector. The first segment 532 extends downward, and the right end of the second segment 531 is connected to the lower end of the first segment 532. The second segment 531 is located below the second electrode assembly 221 and extends to the left.

[0114] That is, the third embodiment adopts a structure in which the single-pole tab 50 on the opposite side is pushed out and bent, and the multi-pole column 33 on one side has different polarities. The current conduction path is shown in FIG10 .

[0115] Example 4

[0116] As shown in Figures 8 to 10, there is one electrode assembly 221, and a pole assembly is provided on the electrode assembly 221. The pole assembly includes a positive pole 31 and a negative pole 32. The positive pole 31 is located on the left side of the electrode assembly 221, and the negative pole 32 is located on the right side of the electrode assembly 221.

[0117] The positive electrode tab 51 corresponding to the positive electrode post 31 includes a second segment 531 and a first segment 532 , and the negative electrode post 32 corresponding to the negative electrode post 32 also includes a second segment 531 and a first segment 532 .

[0118] The first segment 532 corresponding to the positive electrode post 31 is located on the left side of the electrode assembly 221, and the first segment 532 corresponding to the negative electrode post 32 is located on the right side of the electrode assembly 221. The second segment 531 corresponding to the positive electrode post 31 is located above the electrode assembly 221 and extends to the right. The second segment 531 corresponding to the negative electrode post 32 is also located above the electrode assembly 221 and extends to the left. The right end of the second segment 531 corresponding to the positive electrode post 31 is spaced apart from the left end of the second segment 531 corresponding to the negative electrode post 32.

[0119] That is, the fourth embodiment adopts a structure in which the single-pole tab 50 on the same side is pushed out and bent, and the single-pole column 33 on the single side, and its current conduction path is shown in FIG. 13 .

[0120] The present application also provides a battery pack 1000, which includes a single cell 2 and a heat transfer element 40. The single cell 2 is any of the single cells 2 described in the above embodiments. The heat transfer element 40 is capable of transferring heat from the single cell 2 near the first surface 2213 to the outside of the housing 21 corresponding to the second surface 2212. In other words, the use of the heat transfer element 40 can promptly dissipate heat from the single cell 2, improve heat dissipation efficiency, and facilitate fast charging.

[0121] According to one embodiment of the present application, the battery pack 1000 further includes a tray, which defines a receiving space. The single battery 2 is located in the receiving space. The heat transfer element 40 is located in the receiving space. The heat transfer element 40 is thermally connected to the single battery 2.

[0122] According to one embodiment of the present application, the heat transfer element 40 includes a heat conductor 401 , which is a first heat conductor 43 . The first heat conductor 43 can conduct heat near the second surface 2212 to improve the cooling of the temperature of the structure near the second surface 2212 .

[0123] In some specific embodiments of the present application, the heat transfer member 40 includes a heat conductor 401, which is a second heat conductor 44. The second heat conductor 44 is disposed on the housing 21 and is thermally connected to the terminal 33. The second heat conductor 44 extends toward the location of the housing 21 corresponding to the second surface 2212. The provision of the second heat conductor 44 can draw heat away from the vicinity of the terminal 33, thereby improving the cooling effect and cooling rate, thereby facilitating rapid charging.

[0124] According to one embodiment of the present application, there are multiple single cells 2, and the second thermal conductor 44 is thermally connected to the poles of two adjacent single cells 2. For example, multiple single cells 2 are arranged sequentially along a third direction, and the second thermal conductor 44 is thermally connected to the poles 33 of two adjacent single cells 2 in the third direction. In other words, there are multiple single cells 2, and the multiple single cells 2 are arranged sequentially along a third direction, which can be the thickness direction of the single cells 2. The second thermal conductor 44 is thermally connected to the poles 33 of two adjacent single cells 2 in the third direction.

[0125] For example, in the third direction, there are two single cells 2, each comprising a first cell and a second cell. The first cell has a first terminal group, and the second cell has a second terminal group. One terminal 33 of the first terminal group is located to the left of the first cell, and one terminal 33 of the second terminal group is also located to the left of the second cell. Since the first cell and the second cell are arranged sequentially along the third direction, at least one terminal 33 of the first cell and at least one terminal 33 of the second cell are adjacent to each other in the third direction, with a gap between them. A second heat conductor 44 is disposed in this gap, enabling simultaneous heat transfer from the terminals 33 of both cells 2. Optionally, in the second direction, the length of the second heat conductor 44 can be equal to or greater than the length of the terminal 33. When equal, this ensures effective heat dissipation for the terminal 33. When greater than the length of the terminal 33, this facilitates heat transfer from the terminal 33 to a wider area.

[0126] Furthermore, the second heat conducting member 44 is in surface contact with the pole 33 , which can enhance the heat transfer effect. For example, the pole 33 adopts a sheet-like structure, which is conducive to achieving surface-to-surface contact.

[0127] In some specific embodiments of the present application, the battery pack 1000 further includes a heat sink 45 , at least a portion of which is disposed opposite to the first surface 2213 and capable of heat exchange with the electrode 33 .

[0128] For example, the heat transfer element 40 includes a heat sink 45, which is located on the outside of the pole 33, away from the pole piece assembly 221, in the first direction, and is thermally connected to the pole 33. In other words, the heat transfer element 40 includes a heat sink 45, which is located on the side of the pole 33, away from the pole piece assembly 221, in the first direction, and is thermally connected to the pole 33. In other words, the design of the heat sink 45 on the outside of the pole 33 can reduce the temperature increase of the pole 33.

[0129] According to one embodiment of the present application, the radiator 45 includes at least one tubular member having a first fluid channel therein for the flow of cooling fluid, and a portion of the tubular member forms at least a portion of the heat transfer member 40, which can improve heat dissipation efficiency through heat exchange.

[0130] In some specific embodiments of the present application, the battery pack 1000 further includes a cooler 402, which is thermally connected to the housing 21 corresponding to the second surface 2212. In this embodiment, the cooler 402 is provided to improve the heat dissipation efficiency and effect of the heat near the second surface 2212.

[0131] In some specific embodiments of the present application, the first thermal conductor 43 is thermally connected to the battery cell 2 and the cooler 402, respectively. In other words, heat exchange between the battery cell 2 and the cooler 402 is achieved through the first thermal conductor 43. In this embodiment, the provision of the first thermal conductor 43 prevents direct contact between the cooler 402 and the battery cell 2, which could damage the battery cell 2, while also avoiding the need to oversize the cooler 402. Furthermore, when there are multiple battery cells 2, one first thermal conductor 43 can correspond to multiple battery cells 2.

[0132] According to one embodiment of the present application, the cooler 402 and the first heat-conducting member 43 are respectively sheet-shaped, and the first heat-conducting member 43 is in surface contact with the cooler 402 and the single battery 2. For example, the upper end surface of the first heat-conducting member 43 is in contact with the lower end surface of the cooler 402, and the lower end surface of the first 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.

[0133] According to one embodiment of the present application, the receiving space is open at least at one end along its axial direction, and the cooler 402 serves as the bottom plate or top plate of the tray, which can improve space utilization and improve structural compactness.

[0134] According to one embodiment of the present application, a second fluid channel is provided in the cooler 402 for the flow of cooling fluid, and the cooler 402 is thermally connected to the heat transfer element 40 .

[0135] In some specific embodiments of the present application, a second fluid channel is provided in the cooler 402, and a first fluid channel is provided in the radiator 45, and the first fluid channel is connected to the second fluid channel. At this time, the cooler 402 can be used as a liquid cooling plate. By also providing fluid in the radiator 45, the heat dissipation effect near the pole 33 can be improved.

[0136] According to one embodiment of the present application, there are two coolers 402, and the single cell 2 is located between the two coolers 402. That is, the heat transfer element 40 includes two coolers 402. For ease of explanation, the two coolers can be divided into a first cooler 41 and a second cooler 42. 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. For example, the pole piece 20 has a first direction and a second direction. The dimension of the pole piece 20 in the first direction is larger than the dimension in the second direction. 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.

[0137] The first cooler 41 can conduct heat to the upper portion of the single cell 2, while the second cooler 42 can conduct heat to the lower portion of the single cell 2. As can be seen, in this embodiment, the cooperation of the first cooler 41 and the second cooler 42 not only forms a double-sided cooling sandwich structure for the single cell 2, reducing the temperature difference between the two sides of the single cell 2, such as the temperature difference in the height direction. Furthermore, by arranging the first cooler 41 and the second cooler 42 on either side of the single cell 2, heat dissipation in that direction is achieved. Furthermore, by cooperating with the other pole 33 in the first and second directions to achieve heat dissipation in the first direction, multi-directional heat dissipation of the single cell 2 can be achieved. Furthermore, the use of the sheet-shaped pole 33 further enhances the heat dissipation effect.

[0138] In addition, the first cooler 41 can serve as the top plate of the tray, and the second cooler 42 can serve as the bottom plate of the tray, which can improve the heat dissipation effect and avoid the situation where the tray has a top plate, a bottom plate, a first cooler 41, and a second cooler 42 in the height direction at the same time, resulting in excessive space occupation.

[0139] When the tab 50 is a sheet-like structure, the large surface of the tab 50 can be arranged opposite to the cooler 402 to improve the heat dissipation rate of the tab 50 .

[0140] It should be noted that a cooler 402 may be provided on the side of the explosion-proof valve 1 away from the electrode assembly 221. For example, a cooler 402 may be provided above the explosion-proof valve 1. Optionally, a avoidance structure may be provided on the cooler 402 to avoid blocking the opening of the explosion-proof valve 1. The exhaust direction 11 of the explosion-proof valve 1 may be as shown in FIG17 , first upward and then spreading outward.

[0141] In some specific embodiments of the present application, the battery pack 1000 further includes a connector 46. At least a portion of the connector 46 is located between the heat sink 45 and the terminal 33, and is thermally connected to the heat sink 45 and the terminal 33, respectively. The provision of the connector 46 solves the problem of difficult installation and low firmness of the heat sink and the terminal 33. When the terminal 33 is connected to the heat sink 45 via the connector 46, the heat sink 45 can be located outside the connector 46, and the terminal 33 can be located inside the connector 46.

[0142] According to one embodiment of the present application, as shown in Figures 16 and 18, 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 two adjacent single battery cells 2 arranged in the third direction, the second connector portion 462 is connected to the terminal post 33 of the other of the two adjacent single battery cells 2 arranged in the third direction, and 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 second 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 second 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. Furthermore, the third connecting portion 463 is thermally connected to the heat sink 45. A thermally conductive connection, as used herein, refers to the ability for heat conduction to occur between two elements, including direct and indirect connections, as well as positions such as being spaced apart.

[0143] According to one embodiment of the present application, as shown in Figures 18 and 19, the connector 46 further includes a fourth connecting portion 464, the fourth connecting portion 464 and the first connecting portion 461 and the second connecting portion 462 are located on the same side of the third connecting portion 463, and the fourth connecting portion 464 is provided at least one end of the third connecting portion 463 in the second direction. The fourth connecting portion 464 can limit the second 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 the other 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 second 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, the fourth connecting portion 464 is thermally connected to the cooler 402.

[0144] Furthermore, the second heat conducting member 44 is also thermally connected to the current collecting member 222 corresponding to the pole 33 , thereby improving the heat dissipation effect of the current collecting member 222 .

[0145] According to one embodiment of the present application, the housing 21 may include side panels 211 and a cover panel 212. The side panels 211 and the cover panel 212 may cooperate to form a receiving space, and the pole 33 may extend through the cover panel 212. The cover panel 212 may be, but is not limited to, an aluminum cover panel 212 (thickness range: 0.5-3.5 mm) or a steel cover panel 212 (thickness range: 0.2-2 mm). The side panels 211211 may be, but are not limited to, aluminum plates (thickness range: 0.3-2 mm) or steel plates (thickness range: 0.1-1 mm).

[0146] Among them, the maximum length of the pole 33 can be defined as L1, the length of the cover 212 can be defined as L2, the gap between the pole 33 and the cover 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. The various parameters can be represented by the following formula: L1 = (L2-L3*2-(N-1)L4) / N.

[0147] Optionally, in the second direction, at least one end of the connector 46 is thermally connected to the cooler 402. The second heat conductor 44 can be made of a highly thermally conductive material. When the second heat conductor 44 is disposed between the cover plate 212 and the connector 46, the third connection portion 463 can lead heat upward and / or downward along the cover plate 212 to the cooler 402, thereby increasing heat dissipation. The heat from the pole 33 and the current collector 222 can be removed as a whole through the connector 46, thereby improving fast charging capability. Specific heat dissipation paths may include, but are not limited to, the following paths:

[0148] Heat dissipation path 1 is: bent position tab → pole 33 → connector 46 → first heat conducting member 43 → double-sided cooler;

[0149] Heat dissipation path 2 is: bent position tab → pole 33 → connector 46 → radiator 45;

[0150] Heat dissipation path 3 is: bent tab → cover plate 212 → second heat conducting member 44 → connector 46 → first heat conducting member 43 → double-sided cooler;

[0151] The heat dissipation path 4 is: bent tab → cover plate 212 → second heat conducting member 44 → connector 46 → heat sink 45;

[0152] The heat dissipation path 5 is: the top tab → the housing 21 → the first heat conducting member 43 → the double-sided cooler.

[0153] According to one embodiment of the present application, the connector 46 is welded to the pole 33, which can increase connection reliability. Furthermore, the side of the pole 33 is in surface contact with the connector 46. For example, the length of the pole 33 extends in the vertical direction, and the width extends in the left-right direction. The side of the pole 33 in the thickness direction of the pole piece assembly 221 contacts the side of the connector 46, which can increase the welding area between the pole 33 and the connector 46. Optionally, the connector 46 is bonded to the heat sink 45 to improve assembly efficiency.

[0154] In summary, according to the pole 33, single cell 2 and battery pack 1000 of the embodiment of the present application, on the one hand, the pole ear 50 on the single cell 2 can be designed as one or more, and can be set on the same side or different side of the single cell 2, which can be flexible. On the other hand, a new pole 33 structure and a heat transfer member 40 design with a high heat dissipation path can be adopted to improve the high-rate fast charging capability. Different from the traditional two-pole 33 battery cell with one positive and one negative side, the present application increases the heat dissipation area of ​​the collector 222 and improves the current flow capacity of the pole piece group 221; at the same time, combined with high heat dissipation design, such as the double-sided cooler 402, the connector 46 and the radiator 45, and the addition of a second heat conductor 44 between the connector 46 and the cover plate 212 to take away the temperature rise of the pole 33, the overall fast charging capability of the power battery is improved.

[0155] The present application 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 application also has the advantage of high fast charging capability, which will not be described in detail here.

[0156] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may 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.

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