Cells, battery packs and vehicles

Abstract

The present application discloses a single cell, a battery pack and a vehicle, wherein the single cell comprises: a shell, wherein a storage space is defined in the shell; a pole piece, wherein the pole piece is located in the storage space, and wherein the pole piece has at least a first surface and a second surface; a pole lug and a current collector, wherein the pole lug is arranged on the pole piece, and wherein the pole lug comprises a first segment and a second segment connected to each other, wherein the first segment extends from the first surface to the pole piece, wherein the current collector is arranged on the first segment, and wherein the second segment extends from the second surface to the pole piece, so that current is transmitted between the second segment and the second surface; and a pole column, wherein the pole column is arranged on the current collector and extends out of the shell. The single cell of the present application adopts a structure in which the pole lug is pushed out and the pole column is pushed out from the side, thereby achieving a better fast charging capability.

Description

Technical Field

[0001] The present application belongs to the field of battery technology. Specifically, the present application relates to a single cell battery, a battery pack using the single cell battery, and a vehicle having the battery pack. Background Art

[0002] 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 smaller than the length of the wide side ends, and the area is limited, resulting in a small flow area of ​​the tabs and the poles, which limits the fast charging capability of the battery. Summary of the invention

[0003] 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.

[0004] According to a first aspect of the present application, a single cell battery is provided, comprising: a shell, wherein a housing space is defined in the shell; a pole piece, wherein the pole piece is located in the housing space, and wherein the pole piece has at least a first surface and a second surface; a pole lug and a current collector, wherein the pole lug is arranged on the pole piece, and wherein the pole lug comprises a first segment and a second segment connected to each other, wherein the first segment extends from the first surface of the pole piece, wherein the current collector is arranged on the first segment, and wherein the second segment extends from the second surface of the pole piece, so that current is transmitted between the second segment and the second surface; and a pole column, wherein the pole column is arranged on the current collector and extends out of the shell.

[0005] According to an embodiment of the present application, at least one pole is a sheet-shaped body.

[0006] According to an embodiment of 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.

[0007] According to an embodiment of the present application, the surface area of ​​the second surface is greater than the surface area of ​​the first surface.

[0008] 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.

[0009] According to an embodiment of the present application, the heat transfer element includes: a heat conductive element, which is disposed on the shell and thermally connected to the pole, and the heat conductive element extends toward a position of the shell corresponding to the second surface.

[0010] According to an embodiment of the present application, there are a plurality of single battery cells, and the heat conductive member is respectively thermally connected to poles of two adjacently arranged single battery cells.

[0011] According to an embodiment of the present application, the battery pack further includes: a radiator, at least a portion of which is disposed opposite to the first surface and is capable of heat exchange with the pole.

[0012] According to an embodiment of the present application, the heat sink includes at least one tubular member having a first fluid channel therein for cooling fluid to flow, and a portion of the tubular member forms at least a portion of the heat transfer element.

[0013] According to an embodiment of the present application, the battery pack further includes: a cooler, which is thermally connected to the shell corresponding to the second surface.

[0014] According to an embodiment of the present application, a second fluid channel is provided in the cooler for the flow of cooling fluid, and the cooler is thermally connected to the heat transfer element.

[0015] According to an embodiment of the present application, the number of the coolers is two, and the single battery is located between the two coolers.

[0016] 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.

[0017] According to one embodiment of the present disclosure, a single cell is mainly composed of a shell, a pole piece, a pole ear, a current collector and a pole column, wherein the pole ear including the first section and the second section is a bent piece, so that a part of the pole ear 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 ear to form the first section, the current of the pole piece can be led out laterally, and by bending the pole ear to form the second section, it is convenient to connect the pole ear with the current collector, so that the current collector and the first section are arranged in two directions of the pole piece group to control the current direction. In the single cell in the present application, by adopting a structure in which the pole ear is pushed out and the pole column is side-out, 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.

[0018] 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

[0019] 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.

[0020] Figure 1 is a partial exploded view of a single cell of Example 1 provided in the present application;

[0021] Figure 2 is a schematic diagram of the internal structure of a single cell according to the first embodiment of the present application;

[0022] Figure 3 is a schematic diagram of current flow of a single cell of Example 1 provided in the present application;

[0023] Figure 4 is a partial exploded view of a single cell of Example 2 provided in the present application;

[0024] Figure 5 is a schematic diagram of the internal structure of a single cell according to the second embodiment of the present application;

[0025] Figure 6 is a partial exploded view of a single cell of Example 2 provided in the present application;

[0026] Figure 7 is a schematic diagram of current flow of a single cell of Example 2 provided in the present application;

[0027] Figure 8 is a partial exploded view of a single cell of Example 3 provided in the present application;

[0028] Fig. 9 is a schematic diagram of the internal structure of a single cell according to the third embodiment of the present application;

[0029] Fig.10 is a schematic diagram of current flow of a single cell of Example 3 provided in the present application;

[0030] Fig.11 is a partial exploded view of a single cell of Example 4 provided in the present application;

[0031] Fig.12 is a schematic diagram of the internal structure of a single cell according to the fourth embodiment of the present application;

[0032] Fig.13 is a schematic diagram of current flow of a single cell of the fourth embodiment provided by the present application;

[0033] Fig.14 It is a schematic diagram of the assembly of a pole and a current collector according to an embodiment of the present application;

[0034] Fig.15It is a schematic diagram of the assembly of a single cell and a heat dissipation component according to an embodiment of the present application;

[0035] Fig.16 is a partial exploded view of a battery pack according to another embodiment of the present application;

[0036] Fig.17 It is a schematic diagram of the assembly of a single cell and an explosion-proof valve according to an embodiment of the present application;

[0037] Fig.18 This is a schematic structural diagram of a connector according to an embodiment of the present application at an angle;

[0038] Fig.19 is a structural schematic diagram of a connecting piece of an embodiment provided by the present application from another angle;

[0039] Fig. 20 is a schematic diagram of the cooperation between the second heat conducting member and two single cells according to an embodiment provided by the present application;

[0040] Fig.21 yes Fig. 20 Magnified view of area A circled in the middle.

[0041] Reference numerals

[0042] Battery pack 1000;

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

[0044] Single cell 2;

[0045] Housing 21;

[0046] Side plate 211; Cover plate 212;

[0047] Pole piece group 221; first side surface 2211; second side surface 2212; third side surface 2213; current collector 222;

[0048] Positive pole 31; negative pole 32; pole 33; first connecting section 331; second connecting section 332;

[0049] A first cooler 41; a second cooler 42; a first heat conducting member 43; a second heat conducting member 44; a heat sink 45; a connecting member 46; a first connecting portion 461; a second connecting portion 462; a third connecting portion 463; and a fourth connecting portion 464;

[0050] Positive electrode tab 51 ; negative electrode tab 52 ; first segment 532 ; second segment 531 . DETAILED DESCRIPTION

[0051] 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 arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0052] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0053] 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 as part of the specification.

[0054] 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.

[0055] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0056] The single cell 2 according to the embodiment of the present application is described below with reference to the accompanying drawings.

[0057] like Figures 1 to 21 As shown, the single cell 2 according to the embodiment of the present application includes a shell 21, a pole piece, a pole ear, a current collector and a pole column.

[0058] Specifically, a housing space is defined in the shell 21, and the pole piece is located in the housing space. The pole piece has at least a first surface 2213 and a second surface 2212. The pole ear is arranged on the pole piece, and the pole ear includes a first segment 532 and a second segment 531 connected to each other. The first segment 532 extends the pole piece from the first surface 2213. The current collector is arranged on the first segment 532, and the second segment 531 extends the pole piece from the second surface 2212, so that current can be transmitted between the second segment 531 and the second surface 2212. The pole column is arranged on the current collector and extends out of the shell 21.

[0059] In other words, the single cell 2 according to the embodiment of the present application is mainly composed of a housing 21, a pole piece, a pole ear, a current collector and a pole column. The housing 21 has a receiving space, which has a receiving function and can be used to receive and install the pole piece.

[0060] The outer surface of the pole piece at least includes a first surface 2213 and a second surface 2212, wherein the pole ear is arranged at the edge of the pole piece, specifically, the pole ear includes a first segment 532 and a second segment 531 connected to each other, wherein the first segment 532 is located on the first surface 2213 and the pole piece extends from the first surface 2213, and the second segment 531 is located on the second surface 2212 and the pole piece extends from the second surface 2212. In addition, the first segment 532 is connected to the current collector, and the current can be transmitted between the second segment 531 and the second surface 2212. It should be noted that the current transmission direction is not limited here, and it can flow from the second surface 2212 to the second segment 531, or from the second segment 531 to the second surface 2212. In addition, the current can flow from the second segment 531 to the first segment 532, and from the first segment 532 to the second segment 531, which is not limited here.

[0061] Therefore, the single cell 2 according to the embodiment of the present application is mainly composed of a shell 21, a pole piece, a pole ear, a current collector and a pole column, wherein the pole ear including the second segment 531 and the first segment 532 is a bent part, so that a part of the pole ear 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 222. Specifically, by bending the pole ear to form the second segment 531, the current of the pole piece can be led out laterally, and by bending the pole ear to form the first segment 532, it is convenient to connect the pole ear with the current collector 222, so that the current collector 222 and the second segment 531 are arranged in two directions of the pole piece group 221 to control the current direction. In the single cell 2 in the present application, by adopting a structure in which the pole ear is pushed out and the pole column 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 capacity of the single cell 2 is improved. The pole 33 is led out from the end of the pole piece in the first direction, and the pole ear is pushed out when a part of the pole ear is arranged at the end of the pole piece in the second direction.

[0062] It should be noted that, since a single cell 2 may have multiple pole pieces, etc., for the sake of convenience, it can be defined that a single cell 2 has a pole piece group 221, a pole piece group, a current collector group and a pole column group. Among them, the pole piece group 221 includes a plurality of pole pieces arranged in layers, and the pole pieces can be divided into positive pole pieces and negative pole pieces. For example, the pole piece group 221 includes a plurality of repeated structures of positive pole pieces-diaphragms-negative pole pieces arranged in layers. The pole piece group includes a plurality of pole pieces, and the pole pieces can be positive pole pieces 51 or negative pole pieces 52. For example, the number of pole pieces is two, which are divided into positive pole pieces 51 and negative pole pieces 52. The positive pole pieces 51 are electrically connected to the positive pole pieces, and the negative pole pieces 52 are electrically connected to the negative pole pieces. The current collector group includes a plurality of current collectors 222, and the plurality of current collectors 222 are divided into positive current collectors and negative current collectors. The positive current collector is connected to the positive pole piece 51, and the negative current collector is connected to the negative pole piece 52. The pole group extends out of the accommodation space, and the pole group includes two poles 33. The two poles 33 are respectively a positive pole 31 connected to the positive current collector and a negative pole 32 connected to the negative current collector, so that the poles 33 are sideways.

[0063] Optionally, at least one of the multiple pole tabs includes a first segment 532 and a second segment 531 that are connected to each other. That is, in one pole tab group, only the positive pole tab 51 may include the first segment 532 and the second segment 531, or only the negative pole tab 52 may include the first segment 532 and the second segment 531, or both the positive pole tab 51 and the negative pole tab 52 may include the first segment 532 and the second segment 531, which is not limited here.

[0064] According to an 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.

[0065] Alternatively, if Fig.14 As shown, at least one pole 33 includes a first connecting segment 331 and a second connecting segment 332, the first connecting segment 331 is used to connect to the current collector 222, the second connecting segment 332 is connected to the first connecting segment 331, and the second connecting segment 332 is used to connect to an external electrical device, and the first connecting segment 331 and / or the second connecting segment 332 are sheet-like bodies.

[0066] In other words, 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 electrode current collector or the negative electrode current collector. It should be noted that the pole ear of the present application can make the positive and negative electrode foils converge, and the current collector 222 can be a structure formed by welding the pole ear. At this time, the current collector 222 and the pole ear can be two different states of the same material. It should be noted that whether the pole ear and the current collector 222 are set separately or the pole ear and the current collector 222 are the same structure, they all belong to the protection scope of the present application.

[0067] 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 connect to an external electrical device. For example, the second connection segment 332 is located on the left side of the first connection segment 331, the right end of the first connection segment 331 can be connected to the positive electrode collector or the negative electrode collector, the left end of the first connection segment 331 can be connected to the right end of the second connection segment 332, and the left end of the second connection segment 332 can be connected to an external electrical device.

[0068] 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.

[0069] The conventional pole of the prior art is a cylindrical body, which is arranged at the end of the battery cell, and the diameter of the cylindrical body needs to be smaller than the thickness of the battery cell, and the surface area of ​​the cylindrical body is related to the diameter, so the surface area of ​​the cylindrical body is small. In comparison, at least a part of the pole 33 of the present embodiment is a sheet structure, the thickness of the sheet is small, and the dimensions of multiple directions on the sheet can be different from each other. For example, even if the thickness of the sheet is less than the thickness of the battery cell, the sheet can also increase the total area of ​​the pole 33 by expanding the dimensions in other directions. For example, when the thickness direction of the sheet is the front-to-back direction, the sheet can expand its dimensions in the length direction and the width direction. Wherein, when at least the first connecting section 331 adopts a sheet structure, not only the area of ​​the pole 33 can be increased, but also the flow area of ​​the collector 222 can be increased. By increasing the area of ​​the pole 33, the heat dissipation effect can be improved, and by increasing the flow area, the degree of heat generation can be reduced, which solves the technical problem of the limited fast charging capability of the battery with the conventional pole 33 in the prior art.

[0070] In this embodiment, the pole 33 is mainly composed of a first connecting section 331 and a second connecting section 332, wherein the first connecting section 331 and / or the second connecting section 332 adopts a sheet structure to increase the area. When the first connecting section 331 adopts a sheet structure, the flow area of ​​the current collector 222 can also be increased. Increasing the area of ​​the pole 33 is conducive to rapid heat dissipation of the pole 33, and increasing the flow area reduces the heat generation, which is conducive to improving the charging efficiency of the single battery 2 and achieving rapid charging.

[0071] According to an embodiment of the present application, at least one pole 33 is an integrally formed part, that is, the pole 33 prepared by an integrally formed process, such as stamping, includes both the first connecting section 331 and the second connecting section 332. In this embodiment, by using an integrally formed pole 33, processing and production are facilitated, and the step of connecting the first connecting section 331 and the second connecting section 332 together can be omitted.

[0072] 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.

[0073] In addition, if Fig.14 As shown, when the pole 33 is a rectangular piece, the distance between the two sides of the pole 33 along the thickness direction thereof is uniform. For example, the pole 33 extends in the horizontal direction, and for multiple positions on the pole 33, the distance between the upper surface and the lower surface of the pole 33 is the same. In this embodiment, the use of a sheet pole 33 with uniform thickness is conducive to improving processing efficiency.

[0074] In some specific embodiments of the present application, Figure 1 and Fig.11As shown, the pole piece 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.

[0075] Taking the positive electrode tab 51 including the second segment 531 and the first segment 532 as an example, the length direction of the pole piece is defined as the first direction, and the height direction of the pole piece is defined as the second direction. The first direction extends in the horizontal direction, and the second direction extends in the up-down direction. The second segment 531 is located above or below the pole piece group 221, and the first segment 532 is located on the left or right side of the pole piece group 221 to achieve the tab ejection. The tab ejection structure can also increase the current flow area of ​​the tab. For example, the upper end of the positive pole piece 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 current collector located at the left end of the positive pole piece.

[0076] Furthermore, the second segment 531 and / or the first segment 532 is a sheet-shaped body, and the sheet-shaped body has a large face and a small face, and the area of ​​the large face is larger than the area of ​​the small face. The sheet-shaped structure is advantageous for bending the tabs and for installing and positioning the tabs. It is also advantageous for having a flat, large-area large face to be connected to multiple pole pieces.

[0077] 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 designed at the end in the third direction, wherein the third direction may 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 is in the up-down direction, and the third direction extends in the front-back direction. In this embodiment, by avoiding the explosion-proof valve 1 from being set at the end of the pole piece group 221 in the first direction, more space can be reserved for the sheet pole 33 of the present application, so as to further expand the area of ​​the pole 33. In addition, the size of the explosion-proof valve 1 can be increased according to the space of the pole piece group 221 in the second direction and the third direction, and the number of explosion-proof valves 1 can be increased, thereby improving the system thermal safety of the battery pack 1000.

[0078] According to an embodiment of the present application, the length direction of the pole 33 extends along the second direction, and the width direction of the pole 33 extends along the first direction. For example, the sheet-shaped pole 33 extends roughly along the left-right direction, and the pole group also extends roughly along the left-right direction, and the two are roughly parallel to each other. In this embodiment, by limiting the extension direction of the pole 33, it is beneficial to the processing and assembly of the pole 33, and it is also beneficial to the heat dissipation of the sheet-shaped pole 33.

[0079] According to one embodiment of the present application, Fig.11 As shown, the outer surface of the pole piece includes two third surfaces 2211, two second surfaces 2212 and two first surfaces 2213, the two third surfaces 2211 are spaced apart and distributed 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 and distributed along the second direction, and the two ends of each second surface 2212 in the third direction are respectively connected with the two third surfaces 2211; the two first surfaces 2213 are spaced apart and distributed along the first direction, and the two ends of each first surface 2213 in the third direction are respectively connected with the two third surfaces 2211, and the two ends of each first surface 2213 in the second direction are respectively connected with the two second surfaces 2212. Among them, the first segment 532 is arranged on the first surface 2213, and the second segment 531 is arranged on the second surface 2212.

[0080] For example, the pole piece is a rectangular sheet, the length direction of the pole piece is defined as the first direction, the height direction of the pole piece is defined as the second direction, and the thickness direction of the pole piece 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-to-back direction. Since the pole piece group 221 is formed by stacking pole pieces, the length direction, height direction and thickness direction of the pole piece are the length direction, height direction and thickness direction of the pole piece group 221, which are not repeated here. The outer surface of the pole piece 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-to-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 and distributed along the up-down direction, one second surface 2212 is located above the third surface 2211, and the other second surface 2212 is located below the third surface 2211, and the front and rear ends of each second surface 2212 are respectively connected to the third surface 2211. The two first surfaces 2213 are spaced apart and distributed along the left-right direction, and the front and rear ends of each first surface 2213 are 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 arranged on the first surface 2213, and the second segment 531 is arranged on the second surface 2212, that is, the pole ear is bent to form an "L"-shaped structure, the first segment 532 is insulated from the pole piece, and the second segment 531 is electrically connected to the pole piece of the second surface 2212.

[0081] 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 plate, the negative electrode plate and the diaphragm. As long as the positive electrode plate on the same side of the electrode group 221 can be electrically connected to the second segment 531, or the negative electrode plate on the same side of the electrode group 221 can be electrically connected to the first segment 532, it falls within the conceptual scope of the present application.

[0082] In this embodiment, by limiting the shapes of the pole piece and the pole piece group 221 , it can be seen that the bent pole ear of the present application can be applied to the existing pole piece group 221 , which is beneficial to realize the side current extraction.

[0083] According to an embodiment of the present application, along the first direction, the length of the second segment 531 is not greater than the length of the pole piece group 221, for example, the first end of the second segment 531 extends along the first direction, 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 pole group, or shorter than the end position of the pole group. 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 of the pole ear ejection can be realized, it belongs to the conceptual scope of the present application.

[0084] 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 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 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.

[0085] In this embodiment, by setting the first segment 532 on the first surface 2213 with a smaller area, and setting the second segment 531 on the second surface 2212 with a larger area, the pole group also corresponds to the first surface 2213, so that the pole group is set on the end of the pole piece group 221 extending along the second direction, which causes the space in the height direction of the pole piece group 221 to be cramped, thereby reducing the size range of the pole piece group 221 in the second direction and reducing the battery capacity. In addition, connecting the second segment 531 to the end of the pole piece group 221 extending along the first direction is conducive to expanding the connection area between the second segment 531 and the pole piece, and expanding the range of current extraction. In addition, by connecting the second segment 531 to the second surface 2212 with a larger area, the current flow area of ​​the pole ear can be further increased on the basis of realizing the pole ear ejection.

[0086] According to one embodiment of the present application, Figures 1 to 3As shown, the positive pole 31 of the pole group is arranged at one end of the pole piece group 221 in the first direction, and the negative pole 32 is arranged at the other end of the pole piece group 221 in the first direction. For example, the first direction of the pole piece group 221 extends in the left-right direction, and at this time, the positive pole 31 of a pole group is located on the left side of the pole piece group 221, and the negative pole 32 of the pole group is located on the right side of the pole piece group 221. It should be noted that in this embodiment, one pole piece group 221 is not limited to be provided with one pole group.

[0087] In some specific embodiments of the present application, Figures 1 to 3 As shown, the second segment 531 corresponding to the positive pole 31 is located at one end of the pole piece group 221 in the second direction, and the second segment 531 corresponding to the negative pole 32 is located at the other end of the pole piece group 221 in the second direction. For example, when the positive pole 31 of the pole piece group is arranged at one end of the pole piece group 221 in the first direction, and the negative pole 32 is arranged at the other end of the pole piece group 221 in the first direction, the second segment 531 corresponding to the positive pole 31 is located at one end of the pole piece group 221 in the second direction, and the second segment 531 corresponding to the negative pole 32 is located at the other end of the pole piece group 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 pole 31 of a pole piece group can be located above the pole piece group 221, and the second segment 531 corresponding to the negative pole 32 of the pole piece group can be located below the pole piece group 221.

[0088] According to one embodiment of the present application, Figures 8 to 10 As shown, the second segment 531 corresponding to the positive pole 31 and the second segment 531 corresponding to the negative pole 32 are located at the same end of the electrode group 221 in the second direction, and are spaced apart and distributed in the first direction. For example, when the positive pole 31 of the pole group is arranged at one end of the electrode group 221 in the first direction, and the negative pole 32 is arranged at the other end of the electrode group 221 in the first direction, the second segment 531 corresponding to the positive pole 31 and the second segment 531 corresponding to the negative pole 32 are located at the same end of the electrode group 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 pole 31 and the second segment 531 corresponding to the negative pole 32 of one pole group can be located above or below the electrode group 221 at the same time.

[0089] In some specific embodiments of the present application, Fig.11As shown, the positive pole 31 and the negative pole 32 of the pole group are located at the same end of the pole piece group 221 in the first direction, the second segment 531 corresponding to the positive pole 31 is located at one end of the pole piece group 221 in the second direction, and the second segment 531 corresponding to the negative pole 32 is located at the other end of the pole piece group 221 in the second direction. In other words, the positive pole 31 and the negative pole 32 of a pole group can be located at the same end of the pole piece group 221, and at the same end of the pole piece 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. At this time, the positive pole 31 and the negative pole 32 are simultaneously located on the left or right side of the pole piece group 221, the second segment 531 corresponding to the positive pole 31 can be located above the pole piece group 221, and the second segment 531 corresponding to the negative pole 32 can be located below the pole piece group 221.

[0090] According to one embodiment of the present application, Fig.11 As shown, there are two electrode sets 221, and the two electrode sets 221 are sequentially distributed along the first direction, and each electrode set 221 has at least one pole set, and the second segment 531 corresponding to the positive pole 31 of each electrode set 221 and the second segment 531 corresponding to the negative pole 32 are spaced apart and distributed along the second direction. For example, the two electrode sets 221 are arranged in the left-right direction, and the positive pole 31 and the negative pole 32 of one pole set are arranged on the left side of one electrode set 221 away from the other electrode set 221, and the positive pole 31 and the negative pole 32 of another pole set are arranged on the right side of the other electrode set 221. The second segment 531 corresponding to the positive pole 31 of the left electrode set 221 is located above the left electrode set 221 and extends in the left-right direction. The second segment 531 corresponding to the negative pole 32 of the right electrode set 221 is located below the right electrode set 221 and extends in the left-right direction.

[0091] In some specific embodiments of the present application, Figure 4As shown, a pole piece group 221 is provided with a plurality of pole column groups, and each pole column group corresponds 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 pole piece group 221 can be provided with a plurality of pole column groups, for example, two pole column groups are corresponding to a pole piece group 221, and the positive pole columns 31 of the two pole column groups are simultaneously located on the left side of the pole piece group 221, and are distributed spaced apart in the up and down directions, and the negative pole columns 32 of the two pole column groups are simultaneously located on the right side of the pole piece group 221, and are distributed spaced apart 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 along the left and right directions, and are divided into a left pole piece group and a right pole piece group. The positive pole column 31 of the left pole piece group is located above the negative pole column 32 of the left pole piece group, and the negative pole column 32 of the right pole piece group is located above the negative pole column 32 of the right pole piece group.

[0092] According to one embodiment of the present application, Figure 4 As shown, the positive pole 31 of each pole group is located at one end of the pole piece group 221 in the first direction, the negative pole 32 of each pole group is located at the other end of the pole piece group 221 in the first direction, the second segment 531 corresponding to the plurality of positive poles 31 is located at one end of the pole piece group 221 in the second direction, and the second segment 531 corresponding to the plurality of negative poles 32 is located at the other end of the pole piece group 221 in the second direction. That is to say, when a plurality of pole groups are arranged on a pole piece group 221, the positive pole 31 of each pole group is located at one end of the pole piece group 221 in the first direction, and the negative pole 32 of each pole group is located at the other end of the pole piece group 221 in the first direction, so as to realize the opposite-side bipolarity. The second segment 531 corresponding to the plurality of positive poles 31 is located at one end of the pole piece group in the second direction, and the second segment 531 corresponding to the plurality of negative poles 32 is located at the other end of the pole piece group 221 in the second direction. For example, the first direction is the left-right direction, the second direction is the up-down direction, and a plurality of pole groups are provided on one pole piece group 221, the positive pole 31 of each pole group is located on the left side of the pole group, and the negative pole 32 of each pole group is located on the right side of the pole group. The second segment 531 corresponding to the positive pole 31 of each pole group is located on the upper side of the pole piece group 221, and can be arranged in sequence along the thickness direction of the pole piece group 221. The second segment 531 corresponding to the negative pole 32 of each pole group is located on the lower side of the pole piece group 221, and can be arranged in sequence along the thickness direction of the pole piece group 221.

[0093] In some specific embodiments of the present application, Figure 4As shown, in the second direction, a second segment 531 located at the same end of the electrode group 221 is electrically connected to a portion of the electrode, and another second segment 531 is electrically connected to another portion of the electrode. For example, the second direction is the up-down direction, and the thickness direction of the electrode group 221 is the third direction. At least two second segments 531 are arranged in sequence along the thickness direction, one of the second segments 531 is electrically connected to a portion of the electrode in the thickness direction, and the other second segment 531 is electrically connected to another electrode in the thickness direction.

[0094] According to one embodiment of the present application, Figure 6 As shown, 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, and L1<L2.

[0095] In some specific embodiments of the present application, along the thickness direction of the pole piece group 221, the two pole ears 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 staggeredness in the thickness direction.

[0096] The single cell 2 of the present application is described in detail below in conjunction with specific embodiments.

[0097] Embodiment 1

[0098] like Figures 1 to 3 As shown, the number of the pole piece group 221 is one, and the pole piece group 221 is a long strip. The length direction of the pole piece group 221 extends along the left-right direction, that is, the left-right direction is defined as the first direction. The height direction of the pole piece group 221 extends along the up-down direction, that is, the up-down direction is defined as the second direction. The thickness direction of the pole piece group 221 extends along the front-back direction, that is, the front-back direction is defined as the third direction.

[0099] 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.

[0100] 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 assembly 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 assembly 221 and extends in the up-down direction.

[0101] The negative electrode tab 52 corresponding to the negative electrode column 32 includes a second segment 531 and a first segment 532. The second segment 531 of the negative electrode column 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.

[0102] That is to say, the first embodiment adopts the structure design of the opposite-side single-pole ear being pushed out and bent and the single-side single-pole column 33. The current conduction path is as follows: Figure 3 shown.

[0103] Embodiment 2

[0104] like Figures 4 to 7 As shown, the number of the pole piece group 221 is one, and the pole piece group 221 is a long strip. The length direction of the pole piece group 221 extends along the left-right direction, that is, the left-right direction is defined as the first direction. The height direction of the pole piece group 221 extends along the up-down direction, that is, the up-down direction is defined as the second direction. The thickness direction of the pole piece group 221 extends along the front-back direction, that is, the front-back direction is defined as the third direction.

[0105] There are two pole groups, including a first pole group and a second pole group. Each pole group includes a positive pole 31 and a negative pole 32, each positive pole 31 is located on the left side of the pole piece group 221, and each negative pole 32 is located on the right side of the pole piece group 221. Each positive current collector is located on the left side of the pole piece group 221, and each negative current collector is located on the right side of the pole piece group 221. The positive current collector is connected to the corresponding positive pole 31, and the negative current collector is connected to the corresponding negative pole 32.

[0106] The positive electrode tab 51 corresponding to each positive electrode column 31 includes a second segment 531 and a first segment 532. The positive electrode column 31 of the first electrode column group is located above the positive electrode column 31 of the second electrode column group. The first segment 532 corresponding to the positive electrode column 31 of the first electrode column group is located on the left side of the electrode sheet group 221. The second segment 531 corresponding to the positive electrode column 31 of the first electrode column group is located on the upper side of the electrode sheet group 221. The second segment 531 corresponding to the positive electrode column 31 of the first electrode column group is located at the rear side of the second segment 531 corresponding to the positive electrode column 31 of the second electrode column group. The first segment 532 corresponding to the positive electrode column 31 of the first electrode column group is connected to the top of a positive current collector in the up-down direction, and the first segment 532 corresponding to the positive electrode column 31 of the second electrode column group is connected to the end of another positive current collector in the front-back direction.

[0107] The negative electrode tab 52 corresponding to each negative electrode column 32 includes a second segment 531 and a first segment 532. The negative electrode column 32 of the first electrode column group is located above the negative electrode column 32 of the second electrode column group. The first segment 532 corresponding to the negative electrode column 32 of the first electrode column group is located on the right side of the electrode sheet group 221, and the second segment 531 corresponding to the negative electrode column 32 of the first electrode column group is located on the lower side of the electrode sheet group 221. The second segment 531 corresponding to the negative electrode column 32 of the first electrode column group is located in front of the second segment 531 corresponding to the negative electrode column 32 of the second electrode column group. The first segment 532 corresponding to the negative electrode column 32 of the first electrode column group is connected to the end of a negative electrode current collector in the front-to-back direction, and the first segment 532 corresponding to the negative electrode column 32 of the second electrode column group is connected to the bottom of another negative electrode current collector in the up-down direction.

[0108] That is to say, the second embodiment adopts a structure design in which multiple pole ears are pushed out and bent on different sides and multiple poles 33 of the same sex are formed on one side. When the height of the single battery 2 is high, the number of poles 33 can be adjusted according to the actual designable size of the poles 33. The current conduction path is as follows Figure 7 shown.

[0109] Embodiment 3

[0110] like Figures 8 to 10 As shown, there are two electrode sets 221, which are divided into a first electrode set 221 and a second electrode set 221. Each electrode set 221 is provided with a pole set and a pole lug set. The first electrode set 221 and the second electrode set 221 extend in the left-right direction. The positive pole 31 and the negative pole 32 of the first electrode set 221 are arranged on the left side of the first electrode set 221, and the positive pole 31 is located above the negative pole 32. Similarly, the positive pole 31 and the negative pole 32 of the second electrode set 221 are arranged on the right side of the second electrode set 221, and the positive pole 31 is located above the negative pole 32.

[0111] For the first electrode assembly 221, the lower end of the first segment 532 corresponding to the positive electrode column 31 is connected to the positive electrode current collector, the first segment 532 extends upward, the left end of the second segment 531 is connected to the first segment 532, and 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 column 32 is connected to the negative electrode current collector, the first segment 532 extends downward, the left end of the second segment 531 is connected to the lower end of the first segment 532, and the second segment 531 is located below the first electrode assembly 221 and extends to the right.

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

[0113] That is to say, the third embodiment adopts a structure in which a single-pole ear on the opposite side is pushed out and bent, and a multi-pole column 33 with different polarities on one side is used. Fig.10 shown.

[0114] Embodiment 4

[0115] like Figures 11 to 13 As shown, there is one electrode group 221, and one pole group is arranged on the electrode group 221. The pole group includes a positive pole 31 and a negative pole 32, the positive pole 31 is located on the left side of the electrode group 221, and the negative pole 32 is located on the right side of the electrode group 221.

[0116] 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 .

[0117] The first segment 532 corresponding to the positive pole 31 is located on the left side of the pole piece group 221, and the first segment 532 corresponding to the negative pole 32 is located on the right side of the pole piece group 221. The second segment 531 corresponding to the positive pole 31 is located on the upper side of the pole piece group 221 and extends to the right, and the second segment 531 corresponding to the negative pole 32 is also located on the upper side of the pole piece group 221 and extends to the left, and the right end of the second segment 531 corresponding to the positive pole 31 is spaced apart from the left end of the second segment 531 corresponding to the negative pole 32.

[0118] That is to say, the fourth embodiment adopts a structure in which the single-pole ear on the same side is pushed out and bent, and the single-pole column 33 on the single side has a current conduction path as shown in FIG. Fig.13 shown.

[0119] The present application also provides a battery pack 1000, which includes a single cell 2 and a heat transfer element. The single cell 2 is a single cell 2 of any of the above embodiments, and the heat transfer element can transfer the heat of 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, by using the heat transfer element, the heat of the single cell 2 can be timely exported, the heat dissipation efficiency is improved, and the realization of fast charging is facilitated.

[0120] According to an embodiment of the present application, the battery pack 1000 further includes a tray, a receiving space is defined in the tray, the single battery 2 is located in the receiving space, the heat transfer element is located in the receiving space, and the heat transfer element is thermally connected to the single battery 2.

[0121] According to an embodiment of the present application, the heat transfer element includes a first heat conductive element 43 , which can guide the heat near the second surface 2212 out, thereby improving the cooling effect on the temperature of the structure near the second surface 2212 .

[0122] In some specific embodiments of the present application, the heat transfer member includes a second heat conductive member 44, which is disposed on the housing 21 and is thermally connected to the pole 33, and the second heat conductive member 44 extends toward the position of the housing 21 corresponding to the second surface 2212. The second heat conductive member 44 can be provided to lead out the heat near the pole 33, thereby improving the cooling effect and cooling rate, which is conducive to achieving fast charging.

[0123] According to one embodiment of the present application, there are multiple single cells 2, and the second heat conductive member 44 is respectively connected to the poles of two adjacent single cells 2 by heat conductive connection. For example, multiple single cells 2 are arranged in sequence along the third direction, and the second heat conductive member 44 is respectively connected to the poles 33 of two adjacent single cells 2 arranged in the third direction by heat conductive connection. In other words, there are multiple single cells 2, and multiple single cells 2 are arranged in sequence along the third direction, and the third direction may be the thickness direction of the single cell 2. The second heat conductive member 44 is respectively connected to the poles 33 of two adjacent single cells 2 arranged in the third direction by heat conductive connection.

[0124] For example, in the third direction, there are two single cells 2, which are divided into a first single cell and a second single cell. The first single cell has a first pole group, and the second single cell has a second pole group. One pole 33 of the first pole group is located on the left side of the first single cell, and one pole 33 of the second pole group is also located on the left side of the second single cell. Since the first single cell and the second single cell are arranged in sequence along the third direction, at least one pole 33 of the first single cell and at least one pole 33 of the second single cell are adjacently arranged in the third direction, with a gap between them. A second heat conductive member 44 is arranged at the gap position, and the poles 33 of the two single cells 2 can be heat-conducted simultaneously through one second heat conductive member 44. Optionally, in the second direction, the length of the second heat conductive member 44 can be equal to or greater than the length of the pole 33. When equal, the heat dissipation effect of the pole 33 can be guaranteed. When greater than the length of the pole 33, it is beneficial to transfer the heat of the pole 33 to a larger range.

[0125] Furthermore, the second heat conducting member 44 is in surface contact with the pole 33 , which can increase the heat transfer effect. For example, the pole 33 adopts a sheet structure, which is conducive to achieving surface contact.

[0126] 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 is capable of heat exchange with the pole 33 .

[0127] For example, the heat transfer member includes a heat sink 45, which is located on the outer side of the pole 33 away from the pole piece group 221 in the first direction, and is thermally connected to the pole 33. In other words, the heat transfer member includes a heat sink 45, which is located on the side of the pole 33 away from the pole piece group 221 in the first direction, and is thermally connected to the pole 33. In other words, designing the heat sink 45 on the outer side of the pole 33 can reduce the temperature increase of the pole 33.

[0128] According to one embodiment of the present application, the radiator 45 includes at least one tubular member having a first fluid channel therein for cooling fluid to flow, and a portion of the tubular member is formed as at least a portion of a heat transfer member, which can improve heat dissipation efficiency through heat exchange.

[0129] In some specific embodiments of the present application, the battery pack 1000 further includes a cooler, which is thermally connected to the housing 21 corresponding to the second surface 2212. In this embodiment, the heat dissipation efficiency and heat dissipation effect of the heat near the second surface 2212 are improved by providing the cooler.

[0130] In some specific embodiments of the present application, the first heat conductor 43 is thermally connected to the single cell 2 and the cooler, respectively. That is, heat exchange between the single cell 2 and the cooler can be achieved through the first heat conductor 43. In this embodiment, by providing the first heat conductor 43, on the one hand, it is avoided that the cooler is in direct contact with the single cell 2, which may cause easy damage to the single cell 2, and on the other hand, it is avoided that the cooler needs to be designed too large. Moreover, when there are multiple single cells 2, one first heat conductor 43 can correspond to multiple single cells 2.

[0131] According to one embodiment of the present application, the cooler and the first heat-conducting member 43 are respectively sheet-shaped bodies, and the first heat-conducting member 43 is in surface contact with the cooler 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, 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, respectively. The heat conduction area is increased by surface contact, and the force balance and heat dissipation balance of multiple positions on the single battery 2 are improved, and when there are multiple single batteries 2, the force balance and heat dissipation balance of multiple single batteries 2 are improved.

[0132] According to an embodiment of the present application, the receiving space is open at least at one end along its axial direction, and the cooler serves as the bottom plate or top plate of the tray, which can improve space utilization and improve structural compactness.

[0133] According to an embodiment of the present application, a second fluid channel is provided in the cooler for the flow of cooling fluid, and the cooler is thermally connected to the heat transfer element.

[0134] In some specific embodiments of the present application, a second fluid channel is provided in the cooler, 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 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.

[0135] According to an embodiment of the present application, there are two coolers, and the single cell 2 is located between the two coolers, that is, the heat transfer element includes two coolers, and for ease of description, the two coolers can be divided into a first cooler 41 and a second cooler 42, the first cooler 41 can be arranged above the single cell 2, and the second cooler 42 can be arranged below the single cell 2. For example, the pole piece has a first direction and a second direction, the size of the pole piece in the first direction is larger than the size in the second direction, the first cooler 41 is arranged at one end of the single cell 2 in the second direction, and the second cooler 42 is arranged at the other end of the single cell 2 in the second direction.

[0136] The upper part of the single cell 2 can be heat-conducted by the first cooler 41, and the lower part of the single cell 2 can be heat-conducted by the second cooler 42. It can be seen that in this embodiment, by cooperating with the first cooler 41 and the second cooler 42, not only can a sandwich cooling structure with double-sided cooling be formed for the single cell 2, but also the temperature difference on both sides of the single cell 2, such as the temperature difference in the height direction, can be reduced. And by arranging the first cooler 41 and the second cooler 42 on both sides of the single cell 2 respectively, heat dissipation in this direction is achieved, and the heat dissipation in the first direction is achieved by cooperating with another pole 33 in the first direction and the second direction, so that multi-directional heat dissipation of the single cell 2 can be achieved. Furthermore, by adopting the sheet pole 33, the heat dissipation effect is improved.

[0137] 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.

[0138] When the pole ear is a sheet structure, the large surface of the pole ear can be arranged opposite to the cooler to improve the heat dissipation rate of the pole ear.

[0139] It should be noted that a cooler may be provided on the side of the explosion-proof valve 1 away from the electrode assembly 221. For example, a cooler may be provided above the explosion-proof valve 1. Optionally, a avoidance structure may be provided on the cooler to avoid blocking the opening of the explosion-proof valve 1. The exhaust direction 11 of the explosion-proof valve 1 may be as follows: Fig.17 As shown, it first spreads upwards and then spreads outwards.

[0140] In some specific embodiments of the present application, the battery pack 1000 further includes a connector 46, at least a portion of which is located between the heat sink 45 and the pole 33, and is respectively thermally connected to the heat sink 45 and the pole 33. By providing the connector 46, the problem of difficult installation and low firmness of the heat sink and the pole 33 is solved. When the pole 33 is connected to the heat sink 45 through the connector 46, the heat sink 45 can be located on the outside of the connector 46, and the pole 33 can be located on the inside of the connector 46.

[0141] According to one embodiment of the present application, Fig.16 and Fig.18 As shown, the connecting member 46 includes a first connecting portion 461, a second connecting portion 462 and a third connecting portion 463, the first connecting portion 461 is connected to the pole 33 of one of the two single cells 2 arranged adjacent to each other in the third direction, the second connecting portion 462 is connected to the pole 33 of the other of the two single cells 2 arranged adjacent to each other in the third direction, and the third connecting portion 463 is connected to the first connecting portion 461 and the second connecting portion 462 respectively, and cooperates to form a receiving groove, and the receiving groove is used to receive the second heat conducting member 44. For example, the third direction is the front-to-back direction, the first connecting portion 461 and the second connecting portion 462 can be spaced apart and distributed along the front-to-back direction, the third connecting portion 463 can be located between the first connecting portion 461 and the second connecting portion 462, and the rear end of the third connecting portion 463 is connected to the first connecting portion 461, and the front end of the third connecting portion 463 is connected to the second connecting portion 462. The second heat conducting member 44 is located between the first connection portion 461 and the second connection portion 462, and is respectively connected to the first connection portion 461, the second connection portion 462 and the third connection portion 463. In addition, the third connection portion 463 is connected to the heat sink 45. The heat conduction connection in the present application refers to the ability of heat conduction between the two, including direct connection, indirect connection, and positional relationships such as spaced apart settings.

[0142] According to one embodiment of the present application, Fig.18 and Fig.19As shown, the connector 46 also includes a fourth connector 464, which is located on the same side of the third connector 463 as the first connector 461 and the second connector 462, and the fourth connector 464 is arranged at least one end of the third connector 463 in the second direction. The fourth connector 464 can limit the second heat-conducting member 44. Optionally, the number of the fourth connector 464 is two, one fourth connector 464 is located at the upper end of the third connector 463, and the other fourth connector 464 is located at the lower end of the third connector 463. It can be seen that the outer periphery of the second heat-conducting member 44 can be multi-directionally heat-conducted by the first connector 461, the second connector 462, the third connector 463 and the fourth connector 464, so that the heat is transferred to the radiator 45 in a timely and efficient manner. For example, the fourth connector 464 is thermally connected to the cooler.

[0143] Furthermore, the second heat conducting member 44 is also heat-conductingly connected to the current collector 222 corresponding to the pole 33 , thereby improving the heat dissipation effect of the current collector 222 .

[0144] According to an embodiment of the present application, the housing 21 may include a side plate 211 and a cover plate 212, and the side plate 211 and the cover plate 212 may cooperate to form a receiving space, and the pole 33 may extend out of the receiving space through the cover plate 212. The cover plate 212 may be selected from, but not limited to, an aluminum cover plate 212 (thickness range may be 0.5-3.5 mm) or a steel cover plate 212 (thickness range: 0.2-2 mm), and the side plate 211211 may be selected from, but not limited to, an aluminum plate (thickness range may be 0.3-2 mm) or a steel plate (thickness range may be 0.1-1 mm).

[0145] 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, the number of poles 33 can be defined as N, and the parameters can have the following formula: L1 = (L2-L3*2-(N-1)L4) / N.

[0146] Optionally, in the second direction, at least one end of the connector 46 is thermally connected to the cooler. The second heat conductor 44 can be made of a high thermal conductivity material. When the second heat conductor 44 is arranged between the cover plate 212 and the connector 46, the third connection portion 463 can lead the heat upward and / or downward along the cover plate 212 to the cooler to increase the heat dissipation. The heat of the pole 33 and the current collector 222 can be taken away by the connector 46 as a whole to improve the fast charging capability. The specific heat dissipation path may include but is not limited to the following paths:

[0147] Heat dissipation path 1 is: bent position pole ear → pole column 33 → connector 46 → first heat conducting member 43 → double-sided cooler;

[0148] Heat dissipation path 2 is: bent position pole ear → pole 33 → connector 46 → heat sink 45;

[0149] Heat dissipation path 3 is: bent position pole ear → cover plate 212 → second heat conducting member 44 → connecting member 46 → first heat conducting member 43 → double-sided cooler;

[0150] The heat dissipation path 4 is: the bent position tab → the cover plate 212 → the second heat conducting member 44 → the connecting member 46 → the heat sink 45;

[0151] The heat dissipation path 5 is: the top tab→the housing 21→the first heat conducting member 43→the double-sided cooler.

[0152] According to an embodiment of the present application, the connector 46 is welded to the pole 33, and the connection reliability can be increased by welding. Further, the side of the pole 33 is in surface contact with the connector 46, for example, the length direction of the pole 33 extends in the up-down direction, the width direction extends in the left-right direction, and the side of the pole 33 in the thickness direction of the pole piece group 221 is in contact with the side of the connector 46, which can increase the welding bonding area between the pole 33 and the connector 46. Optionally, the connector 46 is bonded to the heat sink 45, which can improve the assembly efficiency.

[0153] 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 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 component 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 current collector 222 and the current flow capacity of the pole piece group 221; at the same time, combined with high heat dissipation design, such as double-sided coolers, connectors 46 and radiators 45, and adding 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.

[0154] The present application also proposes a vehicle, which includes a battery pack 1000 of any of the above embodiments. Since the battery pack 1000 has good heat dissipation effect and improves the 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.

[0155] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting 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.

Claims

1. A battery pack, characterized in that: include: A single cell battery, the single cell battery comprising: A housing, wherein a receiving space is defined in the housing; A pole piece, the pole piece is located in the accommodation space, and the pole piece has at least a first surface and a second surface; A pole ear and a current collector, wherein the pole ear is arranged on the pole piece, the pole ear comprises a first segment and a second segment connected to each other, the first segment extends from the first surface to the pole piece, the current collector is arranged on the first segment, and the second segment extends from the second surface to the pole piece, so that current is transmitted between the second segment and the second surface; A pole, the pole being arranged on the current collector and extending out of the shell; a heat transfer member, the heat transfer member being capable of transferring the heat of the single battery close to the first surface to the outer side of the shell corresponding to the second surface, the heat transfer member comprising a heat conductive member, the heat conductive member being disposed on the shell and being thermally connected to the pole, the heat conductive member extending toward the position of the shell corresponding to the second surface; a radiator, at least a portion of which is disposed opposite to the first surface and capable of exchanging heat with the pole, the radiator comprising at least one tubular member, the tubular member having a first fluid channel therein for cooling fluid to flow, a portion of the tubular member forming at least a portion of the heat transfer member; A cooler is thermally connected to the shell corresponding to the second surface, a second fluid channel is provided in the cooler for cooling fluid to flow, the cooler is thermally connected to the heat transfer element, and the first fluid channel is communicated with the second fluid channel.

2. The battery pack according to claim 1, characterized in that: At least one pole is a plate-shaped body.

3. The battery pack according to claim 1, characterized in that: 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.

4. The battery pack according to claim 3, characterized in that: The surface area of ​​the second surface is greater than the surface area of ​​the first surface.

5. The battery pack according to claim 1, characterized in that: There are a plurality of single cells, and the heat conducting member is respectively connected to the poles of two adjacent single cells through heat conduction.

6. The battery pack according to claim 1, characterized in that: There are two coolers, and the single battery is located between the two coolers.

7. A vehicle, characterized in that: A battery pack comprising any one of claims 1-6.

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