Current collectors, battery cells, battery packs, and power consumption devices

Abstract

A current collector (100), a battery cell (1000), a battery pack (2000), and a power consumption device (3000) are provided. The first connection area (120) of the current collector includes a central portion (122) and a plurality of first connection portions (121) connected to the central portion and a jelly roll. The second connection portion (131) of the current collector is electrically connected to the central portion. The first connection area and the second connection portion have a height difference and are relatively movable. The second connection portion is adapted to be electrically connected to a cover plate (300).

Description

Technical Field

[0001] Cross - reference to Related Applications This application claims priority to Chinese Patent Application No. 2023209626439, titled "CURRENT COLLECTOR, BATTERY CELL, BATTERY PACK, AND POWER CONSUMING APPARATUS", filed on April 14, 2023, the entire content of which is incorporated herein by reference.

[0002] This application relates to the field of power device technologies, and particularly to current collectors, battery cells, battery packs, and power consuming devices.

Background Art

[0003] In the prior art, a battery cell typically includes a jelly roll, a current collector, and a housing. The current collector is bent so as to be positioned between the inside of the housing and the jelly roll. In this way, one side of the current collector is connected to the jelly roll to form the whole, and the other side of the current collector is connected to the housing to implement an electrical connection between the jelly roll and the housing.

[0004] However, the bent current collector occupies a large space, and the size of the jelly roll tends to be compressed, which causes a decrease in the capacity of the battery cell during actual production. In addition, the current collector tends to harden during the bending process, resulting in stress concentration in the current collector and an increased possibility of damage to the current collector.

Summary of the Invention

[0005] Therefore, this application provides a current collector. The current collector is used to implement an electrical connection between a jelly roll and a cover plate, and can further guarantee the capacity of the battery cell and the structural strength of the current collector to facilitate an increase in the capacity of the jelly roll.

[0006] A current collector according to an embodiment of the present application includes a first connection region comprising a central portion and a plurality of first connection portions, wherein the plurality of first connection portions are arranged continuously in the circumferential direction of the central portion, are separately connected to the central portion, and are adapted to be electrically connected to a jelly roll; and a second connection portion located on one side of the first connection region and electrically connected to the central portion, wherein the first connection region and the second connection portion have a difference in height and are relatively movable, and the second connection portion is adapted to be electrically connected to a cover plate.

[0007] According to the current collector of the embodiment of this application, a first connection region and a second connection portion having a height difference are provided, and the first connection region and the second connection portion can cooperate to implement an electrical connection between the jelly roll and the cover plate without bending the current collector in order to reduce the bending process and improve connection efficiency. In addition, stress concentration caused by bending of the current collector can be further avoided. In other words, damage to the current collector can be avoided in order to extend the service life of the current collector and ensure the structural strength of the current collector. The first connection region and the second connection portion having a height difference are used to further reduce the space occupied in the height direction by the current collector in order to reduce the space maintained between the jelly roll and the cover plate in order to improve the capacity of the jelly roll, i.e., increase the capacity of the battery cell, and to ensure that there is sufficient space to place the jelly roll. In addition, the first connection region is defined to include a central portion and a plurality of first connection portions, and the central portion is configured to support the plurality of first connection portions in order to improve the positional stability of the plurality of first connection portions. Multiple first connection parts can cooperate to increase the connection area between the current collector and the jelly roll, thereby improving the connection strength between the current collector and the jelly roll and ensuring the current collector's position is stable. In addition, the overcurrent area of ​​the current collector can be increased to avoid problems such as insufficient overcurrent and severe overheating of the jelly roll, thereby extending the service life of the jelly roll. In other words, the current collector of this application occupies a small space and has high connection efficiency, a long service life, a stable structure, and a large overcurrent area.

[0008] Optionally, the current collector is a component formed by integral molding.

[0009] Optionally, the second connecting portion forms an annular structure and is located radially outside the first connecting region in the radial direction of the second connecting portion, and the inner wall of the second connecting portion is connected to the central portion by using a connecting piece.

[0010] Optionally, the first connection portion has a first surface connected to the jelly roll, the second connection portion has a second surface connected to the cover plate, and the first surface and the second surface are parallel to each other.

[0011] Optionally, the current collector further includes a connection piece. The connection piece is connected between the second connection portion and the central portion. The connection piece extends obliquely with respect to the central portion toward the second connection portion, and thus, the first connection region and the second connection portion have a height difference.

[0012] Optionally, the value range of the inclination angle between the connection piece and the first plane is 5° ≤ α < 90°, and the first plane is perpendicular to the thickness direction of the current collector.

[0013] Optionally, the orthographic projection of the outer peripheral wall of the current collector on the first plane is located on a circle, and the first plane is perpendicular to the thickness direction of the current collector. There are a plurality of connection pieces, and the plurality of first connection portions and the plurality of connection pieces are alternately spaced apart in the circumferential direction of the first connection region.

[0014] Optionally, the value of the circumferential distance between the first connection portion and the adjacent connection piece is in the range of 0.5 mm to 2 mm.

[0015] Optionally, the orthographic projection of the outer peripheral wall of the current collector on the first plane is located on a circle, and the first plane is perpendicular to the thickness direction of the current collector. The minimum value of the radius of the outer peripheral wall of the current collector is R1, and the value of R1 is in the range of 10 mm to 100 mm. The maximum value of the radius of the outer peripheral wall of the first connection region is not less than half of the minimum value of the radius of the outer peripheral wall of the current collector and less than the minimum value of the radius of the outer peripheral wall of the current collector. That is, the maximum value R2 of the radius of the outer peripheral wall of the first connection region and R1 satisfy the following condition, that is, 1 / 2R1 ≤ R2 < R1.

[0016] Optionally, the radial width of the second connection portion is W1. The radial width of the second connection portion is 1 mm or more and not more than half of the minimum value of the radius of the outer peripheral wall of the current collector, that is, 1 mm ≤ W1 ≤ 1 / 2R1.

[0017] Optionally, the orthographic projection of the outer wall of the current collector in the first plane is located on a circle, and the first plane is perpendicular to the thickness direction of the current collector. The second connection portion is provided with a retaining projection extending toward the first connection portion, the retaining projection being located radially outward of the first connection portion and adapted to be located radially outward of the jelly roll tab.

[0018] Optionally, the stopper projection is defined by the bending and deformation of a portion of the second connecting part.

[0019] Optionally, a reinforcing portion is provided on the outer circumference of the stopper projection.

[0020] Optionally, multiple reinforcement sections may be present, separated from each other, forming a bypass port for gas flow between two adjacent reinforcement sections.

[0021] Optionally, a liquid injection port is provided in the central portion, penetrating the central portion in the thickness direction.

[0022] Optionally, the first limiting portion is provided on the second connecting portion and is adapted to cooperate restrictively with the second limiting portion of the cover plate.

[0023] A battery cell according to an embodiment of the present application includes a casing in which a housing cavity having an opening is formed; a jelly roll disposed in the housing cavity; a cover plate disposed in the opening; and the aforementioned current collector disposed between the jelly roll and the cover plate, wherein a first connecting portion is electrically connected to the jelly roll and a second connecting portion is electrically connected to the cover plate, and the cover plate is adapted to drive the second connecting portion to move relative to the first connecting region.

[0024] The battery cell according to an embodiment of the present application can be effectively used to implement an electrical connection between the current collector and the jelly roll and the cover plate, and the capacity of the battery cell can be increased. The battery cell uses the aforementioned current collector and uses the cover plate to drive the second connection portion to move relative to the first connection region. In addition, in order to extend the service life of the battery cell, problems such as insufficient overcurrent and serious heat generation of the jelly roll can be avoided.

[0025] Optionally, the orthographic projection of the outer peripheral wall of the current collector on the first plane is located on a circle. The first plane is perpendicular to the thickness direction of the current collector. The second connection portion is provided with a stop protrusion extending toward the first connection portion. The stop protrusion is located radially outside the first connection portion and radially outside the tab of the jelly roll.

[0026] The battery pack according to an embodiment of the present application includes a plurality of the aforementioned battery cells.

[0027] The battery pack according to an embodiment of the present application uses the aforementioned battery cell so that the capacity of the battery pack can be increased, the use safety of the battery pack can be improved, and the service life of the battery pack can be extended.

[0028] The power consumption device according to an embodiment of the present application includes the aforementioned battery pack.

[0029] The power consumption device according to an embodiment of the present application uses the aforementioned battery pack so that the assembly efficiency of the power consumption device can be improved, the use safety of the power consumption device can be improved, the service life of the power consumption device can be extended, and the use cost can be reduced.

[0030] Additional aspects and advantages of the present application will become apparent from the following description or will be appreciated from the practice of the present application.

[0031] The above and / or additional aspects and advantages of this application will become apparent and readily apparent from the description of the embodiments with reference to the following appended drawings. [Brief explanation of the drawing]

[0032] [Figure 1] This is a schematic diagram of the structure of a current collector according to several embodiments of this application. [Figure 2] This is a top view of a current collector according to several embodiments of this application. [Figure 3] This is a side view of a current collector according to several embodiments of this application. [Figure 4] This is a localized enlarged view of region I in Figure 3. [Figure 5] This is a schematic diagram comparing the movement of the second connection portion before and after movement according to some embodiments of this application. [Figure 6] This is a cross-sectional view of a battery cell according to several embodiments of this application. [Figure 7] This is a top view of a current collector according to another embodiment of the present application. [Figure 8] This is a schematic diagram of the cooperation between the current collector and the cover plate according to another embodiment of the present application. [Figure 9] Schematic diagrams of power consumption devices according to several embodiments of this application. [Modes for carrying out the invention]

[0033] Embodiments of this application are described in detail below, and examples of embodiments are shown in the accompanying drawings. In the accompanying drawings, the same or similar reference numerals always indicate the same or similar elements, or elements having the same or similar function. The following embodiments described with reference to the accompanying drawings are examples and are intended merely to illustrate this application, but should not be construed as limiting this application.

[0034] The current collector 100 in the embodiments of this application will be described below with reference to the accompanying drawings of this specification.

[0035] As shown in Figures 1 and 2, the current collector 100 according to the embodiment of the present application includes a first connection region 120 and a second connection portion 131.

[0036] As shown in Figures 1 and 2, the first connection region 120 includes a central portion 122 and a plurality of first connection portions 121. The plurality of first connection portions 121 are arranged continuously in the circumferential direction of the central portion 122. The plurality of first connection portions 121 are separately connected to the central portion 122. The plurality of first connection portions 121 are adapted to be electrically connected to the jelly roll 200. In this specification, the plurality of first connection portions 121 are electrically connected to the jelly roll 200 in order to increase the connection area between the first connection region 120 and the jelly roll 200, i.e., to increase the connection area between the current collector 100 and the jelly roll 200, thereby improving the overcurrent capability of the current collector 100.

[0037] In the description of this application, unless otherwise specified, "a plurality of" means two or more.

[0038] It should be noted that the multiple first connection portions 121 are arranged continuously in the circumferential direction of the central portion 122. In this way, it is ensured that all of the multiple first connection portions 121 can be connected to the central portion 122. In this case, the central portion 122 and the multiple first connection portions 121 support each other to ensure the structural stability of the first connection area 120, to facilitate connection to the jelly roll 200 by using the first connection portions 121, and to reduce the difficulty of connection. In addition, the circumferential space of the central portion 122 can be appropriately utilized to increase the area of ​​the first connection portions 121, further increase the connection area between the first connection portions 121 and the jelly roll 200, and to improve the overcurrent capacity of the current collector 100.

[0039] As shown in Figures 1 and 2, the second connecting portion 131 is located on one side of the first connecting region 120, and the second connecting portion 131 is electrically connected to the central portion 122. The first connecting region 120 and the second connecting portion 131 have a height difference and are relatively movable, and the second connecting portion 131 is adapted to be electrically connected to the cover plate 300. In this specification, this may be understood as the second connecting portion 131 being electrically connected to both the central portion 122 and the cover plate 300 in order to implement an electrical connection between the second connecting portion 131 and the first connecting portion 121, and to facilitate the implementation of an electrical connection between the jelly roll 200 and the cover plate 300 by using the current collector 100.

[0040] In order to implement a stable connection between the current collector 100 and the cover plate 300, the area of ​​the second connection portion 131 can be increased, and the connection area between the second connection portion 131 and the cover plate 300 can be further increased. The second connection portion 131 is arranged on one side of the first connection region 120.

[0041] In addition, the second connecting portion 131 is positioned on one side of the first connecting portion 120 so that the first connecting portion 120 does not occupy the circumferential space of the second connecting portion 131, and the second connecting portion 131 does not occupy the circumferential space of the first connecting portion 120. In this way, sufficient space is provided for arranging the first connecting portion 120 and the second connecting portion 131 in order to increase the area of ​​the first connecting portion 121 and the second connecting portion 131, and to further increase the connection area between the first connecting portion 121 and the jelly roll 200, and the connection area between the second connecting portion 131 and the cover plate 300.

[0042] It should be noted that the first connection region 120 and the second connection portion 131 of this application have a height difference and are relatively movable. In this specification, having a height difference may be understood as the first connection region 120 and the second connection portion 131 being separated in the height direction of the battery cell 1000. In other words, the first connection region 120 and the second connection portion 131 are arranged at different heights in the battery cell 1000. In this specification, being relatively movable may be understood as the first connection region 120 being movable relative to the second connection portion 131, the second connection portion 131 being movable relative to the first connection region 120, or the first connection region 120 and the second connection portion 131 being movable relative to each other. By defining it in this way, the space occupied in the height direction by the current collector 100 can be reduced, and as a result, when the jelly roll 200 and the cover plate 300 are connected by using the current collector 100, the height of the space maintained between the jelly roll 200 and the cover plate 300 can be reduced. In this way, there is sufficient space to place the jelly roll 200. In other words, the height of the jelly roll 200 can be increased in order to increase the capacity of the jelly roll 200 and further increase the capacity of the battery cell 1000. Note that the current collector 100 is usually made of a metallic conductive material such as copper, aluminum, or iron, and naturally possesses properties such as elasticity and deformability. The first connection area 120 and the second connection portion 131 are defined to have a height difference, and as a result, a change in position may occur between the first connection area 120 and the second connection portion 131 under the action of an external force. In other words, when the cover plate 300 is attached, the cover plate 300 presses against the second connection portion 131 connected to the current collector 100, and as a result, the first connection region 120 and the second connection portion 131 become relatively movable.

[0043] In addition, to reduce the bending process and improve assembly efficiency, the first connection region 120 and the second connection portion 131, which have a difference in height, are directly used to cooperate in connecting the jelly roll 200 and the cover plate 300, so that bending of the current collector 100 can be avoided during the connection process. Furthermore, stress concentration caused by bending of the current collector 100 can be avoided, in order to avoid damage to the current collector 100 and extend the service life of the current collector 100.

[0044] The first connection area 120 and the second connection portion 131 are configured to be relatively movable. In this way, in order to reduce the possibility of insufficient soldering between the current collector 100 and the cover plate 300 and to ensure the yield of the battery cells 1000, the problem of solder gaps existing between the current collector 100 and the cover plate 300 due to changes in the position of the cover plate 300 and the jelly roll 200 can be avoided, and the problem of solder gaps existing between the current collector 100 and the cover plate 300 due to large differences in the flatness of multiple soldering positions on the cover plate 300 or large differences in the flatness of the second connection portion 131 can be further avoided.

[0045] Specifically, in order to further improve the connection strength between the second connecting portion 131 and the cover plate 300 and to ensure the degree of adhesion between the relative contact surface of the second connecting portion 131 and the relative contact surface of the cover plate 300, if the flatness of the connecting surface with which the cover plate 300 cooperates with the second connecting portion 131 is large, the second connecting portion 131 can adaptably adjust its relative position with the first connecting portion 121 based on the flatness of the cover plate 300.

[0046] In order to facilitate future improvements in the manufacturing precision of the battery cell 1000, it may also be understood herein that when the current collector 100 of this application is connected to the cover plate 300, the current collector 100 can mitigate manufacturing errors of the cover plate 300 by using the second connection portion 131.

[0047] In other words, in this application, the first connection area 120 and the second connection portion 131 are defined to be relatively movable, and as a result, the gap between the current collector 100 and the cover plate 300 can be effectively avoided during the connection of the current collector 100 in order to eliminate the effects caused by assembly or manufacturing errors, further improve the connection strength between the current collector 100 and the cover plate 300, and ensure the degree of adhesion between the relative contact surfaces of the current collector 100 and the relative contact surfaces of the cover plate 300, thereby reducing the possibility of insufficient soldering and subsequently ensuring the yield of the battery cells 1000.

[0048] In a specific example, since the first connection area 120 and the second connection portion 131 have a height difference and are relatively movable, when the cover plate 300 and the jelly roll 200 are connected using the current collector 100, the first connection area 120 can be connected to the jelly roll 200 first. Since the first connection area 120 and the second connection portion 131 have a height difference in the height direction of the battery cell 1000, after the first connection area 120 is connected to the jelly roll 200 at a predetermined position, the second connection portion 131 may be positioned close to the cover plate 300 during the process of attaching the cover plate 300 in order to reduce the difficulty of connecting the second connection portion 131 to the cover plate 300. In addition, since the first connection area 120 and the second connection portion 131 are relatively movable, when the second connection portion 131 is connected to the cover plate 300 in this case, it can be ensured that the position of the second connection portion 131 can be changed based on the position, shape, surface structure, etc., of the cover plate 300 so that the second connection portion 131 can be effectively connected to the cover plate 300 in order to ensure connection strength and connection area. In this way, the connection between the cover plate 300 and the jelly roll 200 is implemented by using the current collector 100 in order to reduce the possibility of insufficient soldering between the current collector 100 and the cover plate 300 and to ensure the yield of the battery cells 1000.

[0049] The connection between the first connection area 120 and the jelly roll 200, and the connection between the second connection area 131 and the cover plate 300, may be made by soldering, bonding, or the like.

[0050] In the current collector 100 of the embodiment of this application, the current collector 100 is defined to include a first connection region 120 and a second connection portion 131, and therefore, it can be seen from the above structure that the first connection region 120 and the second connection portion 131 can cooperate to implement an electrical connection between the jelly roll 200 and the cover plate 300.

[0051] The first connection area 120 is configured to include a central portion 122 and multiple first connection portions 121, using the central portion 122 to support multiple first connection portions 121 and to improve the positional stability of the multiple first connection portions 121. In this way, the multiple first connection portions 121 can cooperate to facilitate the implementation of an electrical connection between the first connection area 120 and the jelly roll 200. In addition, when the first connection area 120 is connected to the jelly roll 200, the connection area between the first connection area 120 and the jelly roll 200 can be further increased. In other words, the connection area between the current collector 100 and the jelly roll 200 is increased, which is adapted to improve the connection strength between the current collector 100 and the jelly roll 200, resulting in a more stable relative position between the current collector 100 and the jelly roll 200 and improved positional stability of the current collector 100. In addition, to avoid serious overheating problems in the Jelly Roll 200, extend the service life of the Jelly Roll 200, and improve the safety of use of the Jelly Roll 200, it may be further ensured that the current collector 100 has a large overcurrent area to avoid insufficient overcurrent in the Jelly Roll 200 caused by a small overcurrent area of ​​the current collector 100.

[0052] In order to secure the area of ​​the second connection portion 131, the second connection portion 131 is positioned on one side of the first connection region 120. In this way, when the second connection portion 131 is connected to the cover plate 300, the connection area between the second connection portion 131 and the cover plate 300 can be increased. In other words, the connection area between the current collector 100 and the cover plate 300 is increased, which is adapted to improve the connection strength between the current collector 100 and the cover plate 300, resulting in a more stable relative position between the current collector 100 and the cover plate 300, and further improving the positional stability of the current collector 100.

[0053] In other words, the current collector 100 of this application can be stably connected to the jelly roll 200 and the cover plate 300.

[0054] In addition, in this application, the first connection area 120 and the second connection portion 131 are defined to have a specific height difference. In this way, the current collector 100 can have a specific height in order to implement an electrical connection between the jelly roll 200 and the cover plate 300 by using the current collector 100. In addition, an increase in height due to bending of the current collector 100 is avoided, as a result the bending process is reduced, the connection efficiency between the jelly roll 200 and the cover plate 300 is improved, damage to the current collector 100 can be further avoided, stress concentration caused by bending of the current collector 100 can be avoided, the service life of the current collector 100 is extended, and the structural strength of the current collector 100 is improved.

[0055] In addition, in this application, the first connection area 120 and the second connection portion 131 are defined to be relatively movable, thereby reducing the space occupied in the height direction by the current collector 100 and lowering the height of the space maintained between the jelly roll 200 and the cover plate 300. In this way, the height of the jelly roll 200 can be increased accordingly to increase the capacity of the jelly roll 200, i.e., to increase the capacity of the battery cell 1000.

[0056] In other words, in this application, the relative position between the first connection area 120 and the second connection area 131 is creatively determined so that an electrical connection can be implemented between the jelly roll 200 and the cover plate 300 by using the current collector 100 without bending its structure, in order to improve connection efficiency, further avoid damage to the current collector 100, extend the service life of the current collector 100, and improve the structural strength of the current collector 100. In addition, the difficulty of manufacturing the current collector 100 can be further reduced, the height of the current collector 100 can be further reduced, and the capacity of the jelly roll 200 can be increased.

[0057] In addition, the first connection region 120 and the second connection portion 131 are designed to be relatively movable to adjust the height difference between the first connection region 120 and the second connection portion 131, i.e., to adjust the height of the current collector 100. In this way, the current collector 100 of this application can be used in battery cells 1000 of various sizes to broaden the scope of application of the current collector 100. Because the height of the current collector 100 is adjustable, the height of the current collector 100 can be adjusted based on the position, structure, etc. of the cover plate 300 to avoid cooperative gaps between the current collector 100 and the cover plate 300, thereby eliminating the effects caused by assembly or manufacturing errors, improving the connection strength between the current collector 100 and the cover plate 300, and ensuring the degree of adhesion between the relative contact surfaces of the current collector 100 and the relative contact surfaces of the cover plate 300. In this way, the possibility of insufficient soldering is reduced, and the yield of the battery cells 1000 is subsequently guaranteed.

[0058] In conclusion, the current collector 100 of this application occupies a small space, has a stable structure, high structural strength, a long service life, low manufacturing difficulty, a wide range of applications, and strong overcurrent capability.

[0059] To protect the jelly roll 200 and reduce the possibility of insufficient soldering between the current collector 100 and the cover plate 300, an electrical connection is implemented between the jelly roll 200 and the cover plate 300. It may be understood that the current collector 100 of this application occupies a smaller space and tends to be less prone to damage compared to the prior art, so that the capacity of the jelly roll 200 can be further improved and a sufficiently large overcurrent area is further provided.

[0060] Optionally, the material of the current collector 100 may be an aluminum alloy, pure copper, nickel-plated copper, etc., and as a result the current collector 100 has a conductive function, making it easy to implement an electrical connection between the jelly roll 200 and the cover plate 300 by using the current collector 100.

[0061] In some examples, the jelly roll 200 includes tabs, and a plurality of first connecting portions 121 are electrically connected to the tabs to implement an electrical connection between the current collector 100 and the jelly roll 200.

[0062] It should be noted that the tabs described herein may be flattened full tab structures obtained by kneading or pressing, or multiple tab structures obtained by laser cleaning or die-cutting.

[0063] If the material of the current collector 100 is an aluminum alloy, the current collector 100 is mainly cooperatively connected to the positive electrode tab of the jelly roll 200. If the material of the current collector 100 is pure copper or nickel-plated copper, the current collector 100 is mainly cooperatively connected to the negative electrode tab of the jelly roll 200. In other words, a person skilled in the art may select the material of the current collector 100 based on the application environment of the current collector 100. This is not specifically limited in this application.

[0064] In some examples, the second connection portion 131 extends circumferentially over the first connection region 120. In this way, the area of ​​the second connection portion 131 can be maximized to implement a stable connection between the current collector 100 and the cover plate 300, and the connection area between the second connection portion 131 and the cover plate 300 can be further increased.

[0065] In some embodiments of this application, the current collector 100 is a component formed by integral molding. In other words, in order to reduce the difficulty of manufacturing the current collector 100, improve manufacturing efficiency, and ensure the connection strength and quality between the central portion 122 and the first and second connection portions 121 and 131, the entire current collector 100 is manufactured by an integral molding process, and as a result the current collector 100 has a stable structure, and the current collector 100 is used to implement the electrical connection between the jelly roll 200 and the cover plate 300.

[0066] It should be noted that in the process of producing the current collector 100, the current collector 100 may be cut in order to form structures such as the central portion 122, the first connecting portion 121, and the second connecting portion 131 on the current collector 100.

[0067] In some embodiments of this application, as shown in Figures 1 and 2, the second connecting portion 131 forms an annular structure, and the second connecting portion 131 is located radially outward of the first connecting region 120 in the radial direction of the second connecting portion 131. The annular structure facilitates positioning of the extension of the second connecting portion 131 circumferentially of the first connecting region 120 to ensure the area of ​​the second connecting portion 131. In addition, the annular structure can further increase the structural strength of the second connecting portion 131 and extend the service life of the second connecting portion 131.

[0068] In addition, the second connecting portion 131 is formed as an annular structure so as to facilitate processing of the second connecting portion 131 and reduce the difficulty of manufacturing the second connecting portion 131.

[0069] In addition, in order to reduce the difficulty of connecting the second connecting portion 131 to the cover plate 300, the second connecting portion 131 is designed to form an annular structure so that the entire circumference of the second connecting portion 131 can be connected to the cover plate 300 without the need for a separate error correction mechanism during the process of connecting the second connecting portion 131 to the cover plate 300.

[0070] In other words, in this application, in order to extend the service life of the second connecting portion 131, reduce the difficulty of manufacturing the second connecting portion 131, and reduce the difficulty of connecting the second connecting portion 131 to the cover plate 300, the second connecting portion 131 is provided to have an annular structure so that it has a large connection area and the structural strength of the second connecting portion 131 can be improved.

[0071] In a specific example, to facilitate the implementation of an electrical connection between the second connecting portion 131 and the cover plate 300, the second connecting portion 131 is formed as an annular plate, and the annular plate is made from a conductive material such as aluminum or copper.

[0072] In addition, in order to implement a rational configuration of the second connection portion 131 and the first connection region 120, the second connection portion 131 is positioned radially outward of the first connection region 120 so that the second connection portion 131 and the first connection region 120 can be separated radially from the second connection portion 131. In this way, it is ensured that the second connection portion 131 can be connected to the cover plate 300, the first connection region 120 can be connected to the jelly roll 200, and the connection area between the second connection portion 131 and the first connection region 120 can be further secured, in order to secure the connection area between the current collector 100 and the jelly roll 200, and the connection area between the current collector 100 and the cover plate 300, and to guarantee connection strength.

[0073] In some examples, the inner diameter of the second connecting portion 131 is larger than the outer diameter of the first connecting region 120, so that the second connecting portion 131 is positioned radially outward from the first connecting region 120, in order to increase the area of ​​the first connecting portion 121 and the second connecting portion 131.

[0074] Optionally, as shown in Figure 1, the inner wall of the second connecting portion 131 is connected to the central portion 122 by using a connecting piece 140. The inner wall of the second connecting portion 131 as described herein may be understood as a peripheral wall of the second connecting portion 131 adjacent to the first connecting region 120 for implementing the connection between the second connecting portion 131 and the central portion 122, i.e., for implementing a fixed connection between the second connecting portion 131 and the first connecting region 120. In this way, an electrical connection between the cover plate 300 and the jelly roll 200 can be implemented after the second connecting portion 131 is connected to the cover plate 300 and the first connecting region 120 is connected to the jelly roll 200.

[0075] It should be noted that the connecting piece 140 is arranged such that a fixed connection is implemented between the second connecting portion 131 and the first connecting region 120, further reducing the difficulty of connecting the second connecting portion 131 and the first connecting region 120, and improving connection efficiency.

[0076] In a specific example, when the current collector 100 is produced, the structure between the second connecting portion 131 and the central portion 122 is machined to form a connecting piece 140, and the connecting piece 140 can be further bent to reduce the difficulty of molding the current collector 100 and to improve the connection strength between the connecting piece 140 and the second connecting portion 131 and the central portion 122.

[0077] In some embodiments of this application, the first connecting portion 121 has a first surface connected to the jelly roll 200, and the second connecting portion 131 has a second surface connected to the cover plate 300, with the first and second surfaces being parallel to each other. In this specification, this may be understood as the first connecting portion 121 having a first surface and being adapted to connect to the jelly roll 200 through the first surface so as to implement an electrical connection between the first connecting portion 121 and the jelly roll 200. Correspondingly, the second connecting portion 131 has a second surface and is adapted to connect to the cover plate 300 through the second surface so as to implement an electrical connection between the second connecting portion 131 and the cover plate 300, and to implement an electrical connection between the jelly roll 200 and the cover plate 300 by using a current collector 100.

[0078] It should be noted that in the process of assembling the battery cell 1000, the side of the jelly roll 200 facing the cover plate 300 is usually placed parallel to the side of the cover plate 300 facing the jelly roll 200. Therefore, in this application, the first surface and the second surface are placed parallel to each other so as to ensure that the connection area between the first connection area 120 and the jelly roll 200 is secured, and the connection area between the second connection area 131 and the cover plate 300 is secured, in order to effectively implement the electrical connection between the jelly roll 200 and the cover plate 300 and to reduce the difficulty of connection, the second surface can be effectively connected to the cover plate 300 after the connection between the first surface and the jelly roll 200 is completed.

[0079] In some examples, the surface of the first connecting portion 121 facing the jelly roll 200 is defined as a first surface to facilitate the implementation of an interconnection between the first surface and the jelly roll 200. Correspondingly, the surface of the second connecting portion 131 facing the cover plate 300 is defined as a second surface to facilitate the implementation of an interconnection between the second surface and the cover plate 300.

[0080] In some embodiments of this application, as shown in Figures 1 and 3, the current collector 100 further includes a connecting piece 140, which is connected between a second connecting portion 131 and a central portion 122. The connecting piece 140 extends obliquely to the first connecting portion 121, and therefore the first connecting region 120 and the second connecting portion 131 have a height difference. In other words, when the obliquely extending connecting piece 140 is arranged to connect the second connecting portion 131 and the central portion 122, it can be ensured that the current collector 100 allows the first connecting region 120 and the second connecting portion 131 to have a height difference in order to facilitate the implementation of the electrical connection between the jelly roll 200 and the cover plate 300, and that the difficulty of molding the current collector 100 can be reduced.

[0081] Optionally, the connecting piece 140 is a plate. If the plate extends diagonally with respect to the first connecting portion 121, it can be ensured that the connecting piece 140 is movable and / or deformable with respect to the first connecting portion 121 under the action of an external force. In this way, it is ensured that the first connecting region 120 and the second connecting portion 131 are relatively movable in order to vary the height of the current collector 100 and expand the range of use of the current collector 100.

[0082] The movement and / or deformation described herein may be understood as the connecting piece 140 being constructed to be movable relative to the first connecting portion 121, the connecting piece 140 being constructed to be deformable relative to the first connecting portion 121, or the connecting piece 140 being movable relative to the first connecting portion 121 and constructed to be deformable relative to the first connecting portion 121. Thus, the height difference between the first connecting portion 121 and the second connecting portion 131 can be varied by using the connecting piece 140 to adjust the position of the second connecting portion 131 relative to the first connecting portion 121, i.e., to adjust the relative position between the second connecting portion 131 and the cover plate 300, and the first connecting region 120 and the second connecting portion 131 are relatively movable. Note that the current collector 100, as a conductive element, is usually made of a metallic conductive material such as copper, aluminum, or iron, which naturally possesses properties such as elasticity and deformability. The connecting piece 140 is constructed as a diagonally extending plate, which serves to implement movement and / or deformation and to implement the ability to adjust the position of the second connecting portion 131.

[0083] In a specific example, the connecting piece 140 is formed as a rectangular plate to facilitate the implementation of a fixed connection between the second connecting portion 131 and the central portion 122 using the connecting piece 140, to ensure that the second connecting portion 131 can be positioned radially outward of the first connecting region 120 after the connection is completed, and to ensure that the second connecting portion 131 can be driven to operate the connecting piece 140 under the action of an external force.

[0084] Naturally, in some other examples, the connecting piece 140 may be further formed as a square plate, a fan-shaped plate, or the like. This is not specifically limited in this application.

[0085] In a specific example, since the connecting piece 140 is movable and / or deformable relative to the first connecting portion 121, when the current collector 100 is used to connect the jelly roll 200 and the cover plate 300 separately, if the cover plate 300 has a manufacturing tolerance, the soldering position protruding toward the jelly roll 200 generates a force that drives the corresponding second connecting portion 131 toward the jelly roll 200. The second connecting portion 131 is connected to the first connecting portion 121 by using a diagonally extending plate, and since the diagonally extending plate tends to change position or deform under the action of external forces, when the cover plate 300 drives the corresponding second connecting portion 131 toward the jelly roll 200, the second connecting portion 131 can be driven to act such that the diagonally extending plate is actuated in such a way that it ensures the second connecting portion 131 can move effectively, that is, that it ensures the second connecting portion 131 can change position based on the position of the cover plate 300, and as a result the second connecting portion 131 can be connected to the cover plate 300, and a cooperative gap between the second connecting portion 131 and the cover plate 300 is avoided. In this way, the degree of adhesion between the relative contact surfaces of the current collector 100 and the relative contact surfaces of the cover plate 300 is ensured and the possibility of insufficient soldering is reduced.

[0086] As described above, the second connecting portion 131 can be driven to operate the diagonally extending plate body, and it should be noted that the specific operation of the plate body may be as follows: The second connecting portion 131 drives one end of the plate body connected to the second connecting portion 131 to move toward the jelly roll 200, and during the movement of one end of the plate body, the other end of the plate body is fixed to the jelly roll 200 in order to rotate the entire plate body toward the jelly roll 200 and to implement the movement of the connecting piece 140 toward the first connecting portion 121. Alternatively, the second connecting portion 131 may be driven to bend one end of the plate body connected to the second connecting portion 131 toward the jelly roll 200, and during the bending process, the other end of the plate body may be fixed to the jelly roll 200 in order to implement the deformation of the connecting piece 140 toward the first connecting portion 121.

[0087] Figure 5 is a schematic diagram of the second connection portion 131 before and after movement. Specifically, the solid line indicates the position of the second connection portion 131 before movement, and the dashed line indicates the position of the second connection portion 131 after movement.

[0088] Optionally, the connecting piece 140 is made of a conductive material such as aluminum or copper. The connection between the first connection region 120 and the second connection portion 131 is implemented by using the connecting piece 140, and it is ensured that the second connection portion 131 can effectively drive the diagonally extending connecting piece 140 to act under the action of an external force, that is, the connecting piece 140 is effectively movable and / or deformable relative to the first connection region 120 so as to vary the height difference between the first connection region 120 and the second connection portion 131.

[0089] It should be noted that the specific length, width, and thickness of the connecting piece 140 are not limited in this application, provided that the connecting piece 140 can be used to effectively implement the connection between the first connection area 120 and the second connection portion 131, and that the second connection portion 131 can effectively drive the diagonally extending connecting piece 140 to operate under the action of external forces.

[0090] Naturally, in some other examples, the connecting piece 140 may be a buffer spring instead. One end of the buffer spring is connected to the second connecting portion 131, and the other end of the buffer spring is connected to the first connecting region 120. This also makes it possible for the connecting piece 140 to be constructed to be movable relative to the first connecting region 120 and / or deformable relative to the first connecting region 120 so as to vary the height difference between the first connecting region 120 and the second connecting portion 131.

[0091] In a specific example, when the connecting piece 140 is a buffer spring and the current collector 100 is used to connect the jelly roll 200 and the cover plate 300 separately, if there are significant differences in the flatness of multiple soldering positions on the cover plate 300, the soldering positions protruding toward the jelly roll 200 generate a force that drives the corresponding second connecting portion 131 toward the jelly roll 200, and the second connecting portion 131 compresses and deforms the buffer spring so as to vary the height difference between the first connecting region 120 and the second connecting portion 131.

[0092] In some examples, as shown in Figure 3, the range of the inclination angle between the connecting piece 140 and the first plane is 5° ≤ a < 90°, and the first plane is perpendicular to the thickness direction of the current collector 100. The thickness direction of the current collector 100 in this specification may also be understood as the height direction of the battery cell 1000. Therefore, the first plane may also be understood as perpendicular to the height direction of the battery cell 1000.

[0093] It should be noted that if the inclination angle between the connecting piece 140 and the first plane is less than 5°, the overall height of the current collector 100 will be low, and consequently, the current collector 100 cannot be used to effectively implement an electrical connection between the jelly roll 200 and the cover plate 300. If the inclination angle between the connecting piece 140 and the first plane is 90° or more, the overall height of the current collector 100 will be high, and consequently, the current collector 100 will occupy a large space. As a result, the current collector 100 occupies the layout space of the jelly roll 200, which leads to a reduction in the capacity of the jelly roll 200. In addition, the connecting piece 140 cannot be effectively driven to move the second connection portion 131. In other words, the connecting piece 140 cannot be used to effectively vary the height difference between the first connection area 120 and the second connection portion 131. As a result, the problem of insufficient soldering caused by manufacturing tolerances cannot be resolved.

[0094] Therefore, in this application, the inclination angle between the connecting piece 140 and the first plane is set to 5° ≤ a < 90° so as to ensure that the electrical connection between the jelly roll 200 and the cover plate 300 can be effectively implemented by using the current collector 100, that the height difference between the first connection area 120 and the second connection portion 131 can be more effectively varied by using the connecting piece 140, and that the overall height of the current collector 100 does not become excessively high in order to secure the capacity of the jelly roll 200.

[0095] In a specific example, the angle of inclination between the connecting piece 140 and the first plane may be 5°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, etc.

[0096] Optionally, the height between the first connection area 120 and the second connection portion 131 is in the range of 1 mm to 10 mm. The specific value of the height between the first connection area 120 and the second connection portion 131 may be adjusted based on the inclination angle between the connecting piece 140 and the first plane. The height between the first connection area 120 and the second connection portion 131 is set in the range of 1 mm to 10 mm so as to ensure that the inclination angle a between the connecting piece 140 and the first plane can be within the range of 5° to 90°. In this way, by using the connecting piece 140, it is ensured that the height difference between the first connection area 120 and the second connection portion 131 can be effectively varied and that the overall height of the current collector 100 does not become excessively high in order to ensure the capacity of the jelly roll 200.

[0097] In a specific example, the height between the first connection area 120 and the second connection portion 131 may be 1 mm, 3 mm, 5 mm, 8 mm, 10 mm, etc.

[0098] It should be noted that the aforementioned height between the first connection area 120 and the second connection portion 131 may be understood as the distance in the height direction of the battery cell 1000 between the surfaces of the second connection portion 131 and the first connection portion 121 that face each other.

[0099] Optionally, as shown in Figures 1 and 2, the orthographic projection of the outer wall of the current collector 100 in a first plane is located on a circle, and the first plane is perpendicular to the thickness direction of the current collector 100. In other words, the orthographic projection of the outer wall of the current collector 100 in a plane perpendicular to the thickness direction of the current collector 100 is located on a circle, and as a result, the current collector 100 forms a shape similar to a circle. This circular shape makes it possible to adapt the shape of the current collector 100 to the shape of the jelly roll 200 and the cover plate 300 in order to reduce the difficulty of connecting the current collector 100 to the jelly roll 200 and the cover plate 300, further increase the connection area, and ensure connection quality.

[0100] In some specific examples, referring to Figures 1 and 2, the central portion 122 forms a circular support plate, and all of the multiple first connecting portions 121 are formed as fan-shaped connecting plates, and the multiple first connecting portions 121 are connected radially outward of the central portion 122 and spaced apart circumferentially of the central portion 122. In this way, after the connection between the multiple first connecting portions 121 and the central portion 122 is completed, the first connecting region 120 can form a circular shape. The second connecting portion 131 forms an annular structure and is arranged radially outward of the first connecting region 120, and as a result, the current collector 100 forms a shape similar to a circle.

[0101] Specifically, referring to Figures 1 and 2, the first connection region 120 includes a central portion 122 and a plurality of first connection portions 121. The central portion 122 is formed as a circular aluminum plate or a circular copper plate, and the first connection portions 121 are formed as fan-shaped aluminum plates or fan-shaped copper plates. The plurality of first connection portions 121 are arranged around the outer circumference of the central portion 122 and are separately connected to the central portion 122, and the plurality of first connection portions 121 are spaced apart. A connecting piece 140, formed as a rectangular aluminum plate or a rectangular copper plate, is arranged between two adjacent first connection portions 121. In the circumferential direction of the first connection region 120, the connecting piece 140 and the first connection portions 121 are spaced apart, and the first end of the connecting piece 140 in the radial direction of the first connection region 120 is connected to the central portion 122.

[0102] Referring to Figures 1 and 2, the second connecting portion 131 is formed as an annular aluminum plate or an annular copper plate, and is arranged around the outer circumference of the first connecting region 120, with the second end of the connecting piece 140 in the radial direction of the first connecting region 120 connected to the second connecting portion 131, the connecting piece 140 extending obliquely with respect to the first connecting region 120, and thus the first connecting region 120 and the second connecting portion 131 are separated in the height direction of the battery cell 1000.

[0103] In a specific example, when the current collector 100 is used to connect separately to the jelly roll 200 and the cover plate 300, the first connection area 120 is first connected to the jelly roll 200. Since the first connection area 120 and the second connection area 131 have a height difference in the height direction of the battery cell 1000, the cover plate 300 can effectively contact and cooperate with the second connection area 131 during the process of attaching the cover plate 300. In addition, in the process of connecting the cover plate 300 to the second connection portion 131, if there is a soldering position on the cover plate 300 that protrudes toward the jelly roll 200, the soldering position drives the second connection portion 131 toward the jelly roll 200 so that the cover plate 300 is used to drive the connection piece 140 to move and / or deform toward the first connection area 120, and the second connection portion 131 drives the second end of the connection piece 140 to rotate around the first end toward the jelly roll 200 or drives the second end of the connection piece 140 to bend toward the jelly roll 200, as a result the height of the current collector 100 is varied, the current collector 100 can be effectively connected to the cover plate 300, the degree of adhesion between the relative contact surface of the current collector 100 and the relative contact surface of the cover plate 300 is ensured, and the possibility of insufficient soldering is reduced.

[0104] Optionally, as shown in Figures 1 and 2, there are multiple connecting pieces 140, and the multiple first connecting portions 121 and the multiple connecting pieces 140 are alternately spaced apart in the circumferential direction of the first connecting region 120. Since the current collector 100 forms a shape similar to a circle, in this specification, being in the circumferential direction of the first connecting region 120 may also be understood as the multiple first connecting portions 121 and the multiple connecting pieces 140 being alternately spaced apart in the circumferential direction of the current collector 100. Alternating spacing means that one connecting piece 140 is positioned between two adjacent first connecting portions 121, and correspondingly, one first connecting portion 121 is positioned between two adjacent connecting pieces 140. With the above arrangement, the space of the current collector 100 can be appropriately utilized so that the multiple first connecting portions 121 and the multiple connecting pieces 140 can be positioned on the same current collector 100 at the same time. This facilitates increasing the overcurrent area of ​​the current collector 100 by using multiple first connection parts 121, and ensures that the second connection part 131 can be connected to the central part 122 by using the connection piece 140.

[0105] In some examples, as shown in Figure 2, a plurality of first connecting portions 121 and a plurality of connecting pieces 140 can be arranged alternately in the circumferential direction of the central portion 122, and the plurality of first connecting portions 121 are spaced apart in the circumferential direction of the current collector 100, and the connecting pieces 140 are arranged between two adjacent first connecting portions 121, so that the plurality of first connecting portions 121 and a plurality of connecting pieces 140 are simultaneously arranged on the current collector 100.

[0106] Optionally, as shown in Figure 2, the connecting piece 140 and the first connecting portion 121 are spaced circumferentially around the current collector 100 so that the first connecting portion 121 does not interfere with the deformation and / or movement of the connecting piece 140. In other words, it is ensured that the connecting piece 140 can effectively move and / or deform relative to the central portion 122 in order to vary the height difference between the first connecting region 120 and the second connecting portion 131 and eliminate the effects of insufficient soldering caused by manufacturing errors.

[0107] Optionally, the circumferential distance between the first connecting portion 121 and the adjacent connecting piece 140 is in the range of 0.5 mm to 2 mm. In this way, it is ensured that both the first connecting portion 121 and the connecting piece 140 have sufficient area, and that the connecting piece 140 and the first connecting portion 121 can be separated, in order to ensure that the connecting piece 140 can be effectively moved and / or deformed relative to the central portion 122.

[0108] In some embodiments of this application, as shown in Figure 2, the inner walls of the first connecting portion 121 and the second connecting portion 131 are separated, forming a spacing gap, and the value of the radial dimension G1 of the orthographic projection of the spacing gap in the first plane is in the range of 0.5 mm to 2 mm. The first plane is perpendicular to the thickness direction of the current collector 100. In this specification, the inner walls of the first connecting portion 121 and the second connecting portion 131 are separated, and a spacing gap is formed between the inner walls of the first connecting portion 121 and the second connecting portion 131. The radial dimension of the orthographic projection of the spacing gap in a plane perpendicular to the height direction of the battery cell 1000 is G1, and the value of G1 is in the range of 0.5 mm to 2 mm. If G1 is less than 0.5 mm, the distance between the first connecting portion 121 and the second connecting portion 131 is small, and no change in relative position between the first connecting portion 121 and the second connecting portion 131 can occur. In other words, the first connection portion 121 and the second connection portion 131 cannot effectively have a height difference, and a change in relative position that would reduce the difficulty of molding and connecting the current collector 100 cannot occur. If G1 is greater than 2 mm, the area of ​​the first connection portion 121 and / or the area of ​​the second connection portion 131 is reduced. In other words, the connection area between the first connection portion 121 and the jelly roll 200 is reduced, and / or the connection area between the second connection portion 131 and the cover plate 300 is reduced. As a result, the overcurrent capacity of the current collector 100 becomes insufficient, and the positional stability of the current collector 100 after connection cannot be guaranteed.

[0109] Therefore, in this application, the radial dimension G1 of the orthographic projection of the gap formed by the separation of the inner circumferential walls of the first connecting portion 121 and the second connecting portion 131 in a plane perpendicular to the height direction of the battery cell 1000 is set to a range of 0.5 mm to 2 mm, so as to ensure that the first connecting portion 121 and the second connecting portion 131 can effectively have a height difference and that the areas of the first connecting portion 121 and the second connecting portion 131 can be further secured.

[0110] In some specific examples, the orthographic radial dimension G1 of the gap formed by the separation of the inner circumferential walls of the first connecting portion 121 and the second connecting portion 131 in a plane perpendicular to the height direction of the battery cell 1000 may be 0.5 mm, 1 mm, 1.5 mm, or 2 mm.

[0111] In some examples, as shown in Figure 2, the spacing between the side walls on both sides of each first connection portion 121 gradually increases in the direction away from the central portion 122. In this way, the area of ​​the first connection portion 121 is increased to ensure that the first connection portion 121 has a sufficient connection area with the tabs of the jelly roll 200, thereby ensuring that the current collector 100 has a large overcurrent area and to avoid insufficient overcurrent of the jelly roll 200 caused by a small overcurrent area of ​​the current collector 100. This further avoids serious overheating problems of the jelly roll 200, extends the service life of the jelly roll 200, and improves the safety of use of the jelly roll 200.

[0112] In some examples, the first connecting portion 121 may form a fan shape as shown in Figure 2. The fan shape increases the area of ​​the first connecting portion 121 by gradually increasing the distance between the side walls on both sides of the first connecting portion 121 in the direction away from the central portion 122.

[0113] Naturally, in some other examples, the first connecting portion 121 may alternatively form a triangle, rectangle, circle, etc. This is not specifically limited in this application.

[0114] In some embodiments of this application, as shown in Figure 2, the orthographic projection of the outer wall of the current collector 100 in a first plane is located on a circle, the first plane is perpendicular to the thickness direction of the current collector 100, the minimum radius of the outer wall of the current collector 100 is R1, and the value of R1 is in the range of 10 mm to 100 mm. In this specification, it may be understood that the minimum radius of the outer wall of the current collector 100 is R1 when the current collector 100 forms a shape similar to a circle. To facilitate the implementation of the electrical connection between the jelly roll 200 and the cover plate 300 by using the current collector 100, and to ensure that the current collector 100 has a sufficient contact area with the jelly roll 200 and the cover plate 300, the minimum radius may be understood to be one of several different values ​​for the radius of the outer wall of the current collector 100, with the minimum being in the range of 10 mm to 100 mm.

[0115] Naturally, in some other examples, the radius of the current collector 100 is not limited to 10 mm to 100 mm, and those skilled in the art may define the radius of the current collector 100 based on the actual area of ​​the jelly roll 200 and the cover plate 300 in order to ensure that the current collector 100 has a sufficient contact area with the jelly roll 200 and the cover plate 300.

[0116] In a specific example, referring to Figures 1 and 2, the stopper projection 1313 and the reinforcing portion 1311 are provided on the radial outer wall of the current collector 100. The minimum radius of the outer wall of the current collector 100 may be understood as the radius of the current collector 100 when the stopper projection 1313 is provided on the current collector 100.

[0117] Optionally, as shown in FIG. 2, the maximum value of the radius of the outer peripheral wall of the first connection region 120 is not less than half of the minimum value of the radius of the outer peripheral wall of the current collector 100 and is less than the minimum value of the radius of the outer peripheral wall of the current collector 100. That is, the maximum values R2 and R1 of the radius of the outer peripheral wall of the first connection region 120 satisfy the following condition, that is, 1 / 2R1≦R2<R1. In this specification, there are a plurality of different values for the radius of the outer peripheral wall of the first connection region 120, the maximum value of the radius of the outer peripheral wall of the first connection region 120 is R2, and R2 and R1 need to satisfy a specific relationship.

[0118] 83> It should be noted that R2 is determined to be less than R1 in order to facilitate securing a specific layout space for the second connection portion 131 so as to ensure that the second connection portion 131 has a specific area in order to increase the connection area between the second connection portion 131 and the cover plate 300. R2 is determined to be not less than 1 / 2R1 so that the first connection region 120 can be guaranteed to have a specific area in order to increase the connection area between the first connection region 120 and the jelly roll 200. [[ID="]]

[0119] In other words, in the present application, the relationship between R2 and R1 is determined so that the fixed connection between the current collector 100 and the jelly roll 200 and the fixed connection between the current collector 100 and the cover plate 300 are implemented, and the current collector 100 can be guaranteed to have a large overcurrent area, so as to ensure that both the first connection portion 121 and the second connection portion 131 have a specific connection area.

[0120] Optionally, as shown in FIG. 2, the radius of the central portion 122 is R3, where the radius of the central portion 122 is greater than 5 mm and less than half of the maximum value of the radius of the outer peripheral wall of the first connection region 120, that is, 5 mm < R3 < 1 / 2R2. It should be noted that the radius of the central portion 122 in this specification may also be understood as the radial dimension of the central portion 122 when the central portion 122 is formed as a circular support plate. Since the radius of the first connection region 120 is a fixed value, in order to implement a fixed connection between the current collector 100 and the jelly roll 200 and ensure that the current collector 100 has a large overcurrent area, the relationship between the radius R3 of the central portion 122 and R2 is defined to ensure that both the first connection portion 121 and the central portion 122 have a specific connection area.

[0121] Optionally, as shown in FIG. 2, the radial width of the second connection portion 131 is W1. The radial width of the second connection portion 131 is 1 mm or more and less than or equal to half of the minimum value of the radius of the outer peripheral wall of the current collector 100, that is, 1 mm ≤ W1 ≤ 1 / 2R1. The radial width of the second connection portion 131 described in this specification may be understood as the extension width of the second connection portion 131 in the radial direction of the current collector 100 when the current collector 100 forms a shape similar to a circle. In some examples, the second connection portion 131 is disposed radially outside the first connection portion 121 and the radius of the current collector 100 is fixed. Therefore, by arranging as described above, the connection area of the second connection portion 131 can meet the minimum connection requirement, and it is guaranteed that the first connection portion 121 has a sufficient connection area, so as to facilitate the implementation of electrical connection between the jelly roll 200 and the cover plate 300 by using the current collector 100.

[0122] In some embodiments of this application, as shown in Figures 1, 3, and 4, the orthographic projection of the outer circumferential wall of the current collector 100 in a first plane is located on a circle, and the first plane is perpendicular to the thickness direction of the current collector 100. The second connecting portion 131 is provided with a stopper projection 1313. The stopper projection 1313 extends toward the first connecting portion 121. The stopper projection 1313 is located radially outward of the first connecting portion 121. The stopper projection 1313 is adapted to be located radially outward of the tab of the jelly roll 200. The radially outward side of the first connecting portion 121 as described herein may be understood as the side of the first connecting portion 121 that is adjacent to the radially outward side of the current collector 100 when the current collector 100 forms a shape similar to a circle. The retaining projection 1313 can serve to reinforce the second connecting portion 131 to prevent deformation when the second connecting portion 131 is connected to the cover plate 300, thereby ensuring that the second connecting portion 131 can be stably connected to the cover plate 300, and thus improve the structural strength of the second connecting portion 131. In addition, the retaining projection 1313 facilitates the determination of the position of the tab on the jelly roll 200 so that the tab can be stably positioned on the jelly roll 200, preventing failure of the jelly roll 200 due to loosening of the tab and tension of the solder seam under actual operating conditions.

[0123] Optionally, as shown in Figure 1, the area of ​​the stopper projection 1313 can be increased to ensure that the stopper projection 1313 can effectively improve the structural strength of the second connection portion 131. To this end, the stopper projection 1313 extends circumferentially around the second connection portion 131, which may also be understood as the stopper projection 1313 extending circumferentially around the current collector 100 forming a circular shape. In addition, to further ensure that the tab can be stably positioned on the jelly roll 200, it can be further ensured that the stopper projection 1313 can effectively define the position of the tab.

[0124] In addition, the circumferentially extending stopper projection 1313 of the second connecting portion 131 can further protect the tab to extend its service life, i.e., extend the service life of the jelly roll 200.

[0125] Naturally, in some other examples, there are multiple retaining protrusions 1313, which are spaced apart in the circumferential direction of the second connecting portion 131. In this way, the retaining protrusions 1313 can also be used to improve the structural strength of the second connecting portion 131 and to define the position of the tab.

[0126] Optionally, the length of the extension of the stopper projection 1313 toward the first connection portion 121 is greater than or equal to the exposed height of the tab, in order to ensure that the stopper projection 1313 can effectively protect the tab and define the position of the tab.

[0127] In a specific example, the exposed height of the tab is in the range of 0.5 mm to 2 mm. In other words, the length of the extended portion of the stopper projection 1313 toward the first connection portion 121 is greater than 0.5 mm.

[0128] Optionally, the stopper projection 1313 is defined by the bending and deformation of a portion of the second connecting portion 131. In other words, during the manufacturing process of the second connecting portion 131, a portion of the structure of the second connecting portion 131 is bent and deformed to form the stopper projection 1313. In this way, it is not necessary to separately connect structural members to the second connecting portion 131 to form the stopper projection 1313, thereby reducing the difficulty of manufacturing the stopper projection 1313, i.e., reducing the difficulty of manufacturing the second connecting portion 131. In addition, the positional stability of the stopper projection 1313 can be further improved.

[0129] Optionally, a reinforcing portion 1311 is provided on the outer circumference of the retaining projection 1313, as shown in Figures 1 and 2. The reinforcing portion 1311 is configured to improve the structural strength of the retaining projection 1313 and the second connecting portion 131, and to prevent deformation when the second connecting portion 131 is connected to the cover plate 300, thereby further ensuring that the retaining projection 1313 can effectively protect the tab and define the position of the tab.

[0130] Optionally, as shown in Figures 1 and 2, there are multiple reinforcing portions 1311, which are spaced apart. The multiple reinforcing portions 1311 cooperate to maximize the structural strength of the retaining projection 1313 and the second connecting portion 131.

[0131] Optionally, as shown in Figures 1 and 2, a bypass port 1312 for fluid flow is formed between two adjacent reinforcing portions 1311. In other words, it is only necessary to separate the two adjacent reinforcing portions 1311 so that they cooperate to form the bypass port 1312 on the outer circumferential wall of the second connecting portion 131, without requiring separate machining of the second connecting portion 131 to form the bypass port 1312. This reduces the manufacturing difficulty of the bypass port 1312, i.e., the manufacturing difficulty of the second connecting portion 131, and further improves the manufacturing efficiency of the second connecting portion 131. The bypass port 1312 is configured to implement communication between the two opposite ends of the second connecting portion 131 to ensure that gas can flow smoothly within the jelly roll 200.

[0132] In other words, the avoidance port 1312 of this application is adapted to form an exhaust passage.

[0133] In some examples, as shown in Figure 2, multiple avoidance ports 1312 are provided on the outer periphery wall of the second connection portion 131, and the multiple avoidance ports 1312 are evenly spaced apart so that they can cooperate to ensure that the gas distribution within the jelly roll 200 can be more even.

[0134] Note that Figure 2 shows that the avoidance port 1312 forms a shape similar to a rectangle. In some other examples, the avoidance port 1312 may alternatively form a circle, triangle, or the like. This is not specifically limited in this application.

[0135] It should be noted that the specific number of the multiple avoidance ports 1312 is not limited in this application, and that those skilled in the art may determine the number based on the amount of gas produced in the jelly roll 200.

[0136] Optionally, the radial width of the bypass port 1312 is W2, where 0.5 mm ≤ W2 ≤ 5 mm. Note that the radial width of the bypass port 1312 as described herein may be understood as the extension of the bypass port 1312 radially of the current collector 100 when the current collector 100 forms a shape similar to a circle. If W2 < 0.5 mm, the exhaust capacity of the bypass port 1312 is reduced. If W2 > 5 mm, the manufacturing difficulty of the bypass port 1312 is increased and the connection area between the second connection portion 131 and the cover plate 300 is affected.

[0137] Therefore, in this application, the radial width W2 of the avoidance port 1312 is set to be between 0.5 mm and 5 mm, so as to ensure that the gas inside the jelly roll 200 can be smoothly discharged from the avoidance port 1312, and further ensure that the avoidance port 1312 can be formed more effectively. In addition, the area of ​​the second connection portion 131 is secured, that is, the connection area between the second connection portion 131 and the cover plate 300 is secured.

[0138] In some embodiments of this application, as shown in Figures 1 and 2, the central portion 122 is provided with a liquid injection port 1221 that penetrates the central portion 122 in the thickness direction of the central portion 122. In this specification, the central portion 122 is provided with a liquid injection port 1221 that penetrates the central portion 122 in the thickness direction of the central portion 122 to implement communication between the two sides of the central portion 122 in the thickness direction in order to facilitate liquid injection into the jelly roll 200 through the liquid injection port 1221.

[0139] In other words, when the current collector 100 of this application is electrically connected to the jelly roll 200, it can also be guaranteed that the liquid can be successfully injected into the jelly roll 200.

[0140] Optionally, as shown in Figure 1, the liquid injection port 1221 includes a through port 1222 and a positioning port 1223 communicating with each other. The through port 1222 facilitates the injection of liquid into the jelly roll 200. The positioning port 1223 is adapted to work with a tooling device to avoid rotation of the current collector 100 during the installation process. Through the above configuration, it can be ensured that the liquid injection port 1221 facilitates the injection of liquid into the jelly roll 200 and also facilitates the positioning of the current collector 100, thereby reducing the difficulty of connecting the current collector 100 and improving connection efficiency. In addition, the accuracy of the connection between the current collector 100 and the jelly roll 200 can be further ensured.

[0141] In addition, the positioning port 1223 can further prevent the current collector 100 from rotating relative to the jelly roll 200 in order to improve the positional stability of the current collector 100.

[0142] In a specific example, the through-port 1222 is formed as a circular port to facilitate the injection of liquid into the jelly roll 200 through the through-port 1222 and to ensure the amount of liquid injected. The placement port 1223 is formed as a rectangular port so that it is used to cooperate with the tooling device to avoid rotation of the current collector 100 during the installation process and to reduce the difficulty of installing the current collector 100.

[0143] In some embodiments of this application, referring to Figures 7 and 8, a first limiting portion 132 is provided on a second connecting portion 131, and the first limiting portion 132 is adapted to limitingly cooperate with a second limiting portion 310 of the cover plate 300. In other words, a second limiting portion 310 is provided on the cover plate 300, and a first limiting portion 132 is provided on the second connecting portion 131. After the second limiting portion 310 and the first limiting portion 132 are in a limiting cooperative state, limiting cooperation between the second connecting portion 131 and the cover plate 300 can be implemented to avoid changes in the relative position between the second connecting portion 131 and the cover plate 300 during the connection process, thereby reducing the difficulty of connecting the second connecting portion 131 and the cover plate 300 and improving connection efficiency.

[0144] Optionally, the second connecting portion 131 forms an annular shape, and the first restricting portion 132 is a restricting port extending to the inner circumferential wall of the second connecting portion 131. In this specification, the first restricting portion 132 is a restricting port that extends radially to the second connecting portion 131 and to the inner circumferential wall of the second connecting portion 131 in order to facilitate the implementation of restrictive cooperation between the second connecting portion 131 and the cover plate 300 by using the restricting port.

[0145] Optionally, the second limiting portion 310 is a limiting protrusion, and the limiting protrusion is provided on the cover plate 300 and extends toward the current collector 100 to ensure that the limiting protrusion can perform a limiting cooperation at the limiting port so as to implement a limiting cooperation between the second connecting portion 131 and the cover plate 300 through the cooperation between the first limiting portion 132 and the second limiting portion 310.

[0146] Optionally, the radial width of the second connecting portion 131 is W1, and the radial width W3 of the first limiting portion 132 is not less than 0.5 mm and less than the radial width of the second connecting portion 131, that is, 0.5 mm ≤ W3 < W1. In other words, the first limiting portion 132 has a specific width in the radial direction of the current collector 100 forming a circular shape to facilitate the formation of the limiting notch and to facilitate implementing the layout cooperation between the second connecting portion 131 and the cover plate 300 by using the first limiting portion 132. In addition, in order to ensure that the second connecting portion 131 has a specific structural strength, extend the service life, and ensure that the second connecting portion 131 has a specific connection area with the cover plate 300, the reduction in the structural strength and connection area of the second connecting portion 131 caused by providing the first limiting portion 132 can be avoided, and the radial width of the first limiting portion 132 is defined to be less than the radial width of the second connecting portion 131.

[0147] Optionally, as shown in FIG. 7, the circumferential length of the first limiting portion 132 is G2, where 0.5 mm ≤ G2 ≤ πR1 / n1, n1 represents the quantity of the first limiting portions 132, π represents the ratio of the circumference of a circle to the diameter of the circle, and π ≈ 3.14. In this way, it is guaranteed that the first limiting portion 132 has a specific extension length for cooperating with the limiting protrusion, and the excessive reduction in the area of the second connecting portion 131 caused by providing the first limiting portion 132 can be further avoided. In other words, the second connecting portion 131 has a specific connection area with the cover plate 300 to facilitate implementing a fixed connection between the current collector 100 and the cover plate 300.

[0148] Optionally, as shown in Figure 7, there are multiple first limiting portions 132, which are provided in a one-to-one alignment with the multiple first connecting portions 121 in the radial direction of the second connecting portion 131. The multiple first limiting portions 132 are provided to ensure that the arrangement cooperation between the second connecting portion 131 and the cover plate 300 can be effectively implemented. To prevent the first limiting portions 132 from affecting the fixed connection between the second connecting portion 131 and the central portion 122, the multiple first limiting portions 132 are provided in a one-to-one alignment with the multiple first connecting portions 121 so that the first limiting portions 132 can be provided away from the connecting piece 140. In other words, it is ensured that the first limiting portion 132 can be used to effectively implement the positional cooperation between the second connecting portion 131 and the cover plate 300 so as to ensure the positional stability and structural strength of the current collector 100, and it is further ensured that the fixed connection between the second connecting portion 131 and the central portion 122 can be effectively made.

[0149] Note that the figure shows the case where the orthographic projection of the first limiting portion 132 in the first plane forms a rectangle. In some other examples, the orthographic projection of the first limiting portion 132 in the first plane forms a square, triangle, sector, etc.

[0150] Hereinafter, the battery cell 1000 in the embodiments of this application will be described with reference to the accompanying drawings of this specification.

[0151] As shown in Figure 6, the battery cell 1000 according to the embodiment of this application includes a casing 400, a jelly roll 200, a cover plate 300, and a current collector 100.

[0152] A housing cavity with an opening is formed within the casing 400. The opening is adapted to implement communication between the inside and outside of the housing cavity in order to ensure that external components (e.g., current collector 100 and jelly roll 200) can be disposed within the housing cavity.

[0153] The jelly roll 200 is housed in a cavity, and the cover plate 300 is housed in the opening. In other words, the jelly roll 200 is adapted to be housed in the casing 400 to protect it, thereby extending its service life and improving its safety during use. In addition, the cover plate 300 is housed in the opening so that it can be sealed, preventing external foreign matter, dust, etc. from entering the cavity through the opening and further improving the safety during use of the jelly roll 200.

[0154] The current collector 100 is the current collector 100 described above. The current collector 100 is disposed between the jelly roll 200 and the cover plate 300. The first connection portion 121 is electrically connected to the jelly roll 200, and the second connection portion 131 is electrically connected to the cover plate 300. The cover plate 300 is adapted to drive the second connection portion 131 to move relative to the first connection region 120.

[0155] It can be seen from the above structure that the battery cell 1000 in this embodiment of the application uses the aforementioned current collector 100 so as to improve the capacity of the battery cell 1000, further avoid inadequate soldering, and ensure the quality of the battery cell 1000, thereby reducing the space occupied by the current collector 100 within the casing 400 and contributing to increasing the capacity of the jelly roll 200.

[0156] In addition, to avoid serious overheating problems in the jelly roll 200, a fixed connection is implemented between the current collector 100 and the jelly roll 200, increasing the overcurrent area of ​​the current collector 100. Furthermore, to avoid insufficient overcurrent in the jelly roll 200 caused by a small overcurrent area of ​​the current collector 100, the first connection portion 121 is configured to be electrically connected to the jelly roll 200 so as to ensure that the current collector 100 has a sufficient connection area with the jelly roll 200. In this way, the service life of the jelly roll 200 is extended and the safety of use of the jelly roll 200 is improved, thereby extending the service life of the battery cell 1000 and improving the safety of use of the battery cell 1000.

[0157] The second connection portion 131 is configured to connect to the cover plate 300 so as to implement an electrical connection between the current collector 100 and the cover plate 300. To enable the battery cell 1000 to function properly, the cover plate 300 can be used to drive the second connection portion 131 relative to the first connection area 120 so as to implement an electrical connection between the jelly roll 200 and the cover plate 300.

[0158] In addition, by using the aforementioned current collector 100, the structural stability of the battery cell 1000 can be further improved.

[0159] In other words, the battery cell 1000 of this application uses the aforementioned current collector 100, and as a result, the battery cell 1000 has advantages such as a large capacity, a stable structure, a long service life, and high safety of use.

[0160] The battery cell 1000 is a cylindrical battery, so that the structure of the battery cell 1000 (jelly roll 200 and cover plate 300) can be adapted to a circular current collector.

[0161] In some examples, the orthographic area of ​​the first connection portion 121 in the first plane is S1, and the minimum connection area between the first connection portion 121 and the jelly roll 200 is S, where S = γS1 and 0.2 ≤ γ ≤ 1. In other words, the minimum connection area between the first connection portion 121 and the jelly roll 200 may be less than the orthographic area of ​​the first connection portion 121 in the first plane, but it is still essential to ensure that the first connection portion 121 has a sufficient connection area with the jelly roll 200 in order to guarantee the overcurrent capability of the current collector 100.

[0162] In addition, the minimum connection area between the first connection portion 121 and the jelly roll 200 may be set to be less than the area of ​​the orthographic projection of the first connection portion 121 in the first plane, so as to reduce the difficulty of connecting the current collector 100 and the jelly roll 200 and to improve the assembly efficiency of the battery cell 1000. The connection area between the first connection portion 121 and the jelly roll 200 may be measured based on the connection trace, for example, based on the soldering mark. The distinguishing boundary between the first connection portion 121 and the central portion 122 may be a straight line connecting the side walls on both sides of the connection position between the first connection portion 121 and the central portion 122.

[0163] Note that in some examples, a minimum connection area may be provided on the first connection portion 121 to ensure that the operator can effectively determine whether the minimum connection area between the first connection portion 121 and the jelly roll 200 meets the requirements. When all minimum connection areas are connected to the jelly roll 200, the minimum connection area between the first connection portion 121 and the jelly roll 200 is determined to meet the requirements.

[0164] Optionally, multiple placement portions, such as placement grooves or placement protrusions, are provided on the first connection portion 121, and the area surrounded by the multiple placement portions forms a minimum connection area.

[0165] In some examples, the minimum connection area S between the first connection portion 121 and the jelly roll 200 may be determined based on the minimum overcurrent requirement C of the jelly roll 200, where the product of the quantity of the first connection portion 121, the compensation coefficient, the overcurrent coefficient of the first connection portion 121, and the minimum connection area between the first connection portion 121 and the jelly roll 200 is greater than or equal to the minimum overcurrent requirement of the jelly roll 200. In other words, the minimum connection area S between the first connection portion 121 and the jelly roll 200, and the minimum overcurrent requirement C of the jelly roll 200 must satisfy the following condition, namely nNKS≧C, where n represents the quantity of the first connection portion 121, N is the compensation coefficient, N is in the range of 0.7 to 1, and K is the overcurrent coefficient of the first connection portion 121.

[0166] K can be directly determined based on the material of the first connecting portion 121, Ah / mm 2Please note that this is a unit. The minimum overcurrent requirement C of the jelly roll 200 can be determined based on the charging time required by the jelly roll 200, and the specific determination method is as follows: In the actual production process of the battery cell 1000, the rapid charging time that the produced battery cell 1000 must satisfy can be directly determined. In other words, the charging time of the battery cell 1000 can be clearly determined. The charging time of the jelly roll 200 is determined based on the charging time of the battery cell 1000, and the minimum overcurrent requirement C of the jelly roll 200 is obtained based on the charging time of the jelly roll 200. Finally, the minimum connection area S between the first connection part 121 and the jelly roll 200 is calculated based on the minimum overcurrent requirement C so that the minimum connection area S between the first connection part 121 and the jelly roll 200 and the minimum overcurrent requirement C of the jelly roll 200 can satisfy specific conditions. In this way, in order to extend the service life of the Jelly Roll 200 and improve the safety of use of the Jelly Roll 200, it is ensured that the overcurrent capacity of the current collector 100 can meet the minimum overcurrent requirements of the Jelly Roll 200, thereby avoiding insufficient overcurrent of the Jelly Roll 200 and preventing serious overheating problems of the Jelly Roll 200.

[0167] In some specific examples, the minimum overcurrent requirement C for the Jelly Roll 200 ranges from 15Ah to 120Ah.

[0168] Optionally, in order to further guarantee the overcurrent capacity of the current collector 100, the connecting width H between the first connecting portion 121 and the central portion 122 and the minimum overcurrent requirement C of the jelly roll 200 also need to meet certain conditions.

[0169] The connecting width H as described herein may be understood as the straight-line distance between the two side walls at the connection point between the first connecting portion 121 and the central portion 122. In other words, there are two side walls at the connection point between the first connecting portion 121 and the central portion 122, and the straight-line distance between the two side walls forms the connecting width H between the first connecting portion 121 and the central portion 122 (see Figure 2 for details regarding the connecting width H).

[0170] Specifically, the product of the number of first connection portions 121, the overcurrent coefficient of the current collector 100, the connection width between the first connection portion 121 and the central portion 122, and the thickness of the first connection portion 121 is greater than or equal to the minimum overcurrent requirement of the jelly roll 200. In other words, the connection width H between the first connection portion 121 and the central portion 122 and the minimum overcurrent requirement C of the jelly roll 200 satisfy the following condition, namely nKHδ≧C, where n represents the number of first connection portions 121, δ represents the thickness of the first connection portion 121, and K is the overcurrent coefficient of the current collector 100, which can be directly determined based on the material of the current collector 100, Ah / mm 2 It is a unit.

[0171] In other words, in the actual production process of the battery cell 1000, it is ensured that the minimum connection area S between the first connection portion 121 and the jelly roll 200 and the minimum overcurrent requirement C of the jelly roll 200 meet specific conditions, and the connection width H between the first connection portion 121 and the central portion 122 and the minimum overcurrent requirement C of the jelly roll 200 also need to meet specific conditions in order to effectively ensure the overcurrent capability of the current collector 100.

[0172] The specific method for determining the connection width H between the first connection portion 121 and the central portion 122 is as follows: In the actual production process of the battery cell 1000, the charging time of the battery cell 1000 can be directly determined. After the charging time of the battery cell 1000 is determined, the charging time of the jelly roll 200 is first determined based on the charging time of the battery cell 1000, and the minimum overcurrent requirement C of the jelly roll 200 is obtained based on the charging time of the jelly roll 200. Finally, the connection width H between the first connection portion 121 and the central portion 122 is calculated based on the minimum overcurrent requirement C, the quantity of the first connection portion 121, and the thickness of the first connection portion 121, such that the connection width H between the first connection portion 121 and the central portion 122 and the minimum overcurrent requirement C of the jelly roll 200 satisfy specific conditions.

[0173] In some embodiments of this application, as shown in Figures 1, 3, and 4, the orthographic projection of the outer circumferential wall of the current collector 100 in a first plane is located on a circle, and the first plane is perpendicular to the thickness direction of the current collector 100. The second connecting portion 131 is provided with a stop projection 1313 extending toward the first connecting portion 121. The stop projection 1313 is located radially outward of the first connecting portion 121, and the stop projection 1313 is located radially outward of the tab of the jelly roll. The radially outward side of the first connecting portion 121 as described herein may be understood as the side of the first connecting portion 121 that is adjacent to the radially outward side of the current collector 100 when the current collector 100 forms a shape similar to a circle. If the stopper projection 1313 is positioned radially outward of the first connection portion 121, after the current collector 100 is connected to the jelly roll 200, the stopper projection 1313 can be positioned radially outward of the tabs of the jelly roll. This facilitates defining the position of the tabs by using the stopper projection 1313 so that the tabs can be stably positioned on the jelly roll 200, preventing failure of the jelly roll 200 due to loosening of the tabs and tensioning of the solder seams under actual operating conditions.

[0174] In other words, the current collector 100 of this application can be used to implement an electrical connection between the jelly roll 200 and the cover plate 300 so as to ensure the operational performance of the battery cell 1000, and can be further used to fasten tabs.

[0175] The following describes a battery pack 2000 according to an embodiment of this application.

[0176] The battery pack 2000 according to the embodiment of this application includes a plurality of battery cells 1000, each of which is the aforementioned battery cell 1000.

[0177] From the above-described structure, it can be seen that the battery pack 2000 according to the embodiment of this application uses the aforementioned battery cell 1000 so that the capacity of the battery cell 1000 can be increased, the structural stability of the battery pack 2000 can be improved, the service life of the battery pack 2000 can be extended, and the safety of use of the battery pack 2000 can be improved.

[0178] The following describes a power consumption device 3000 according to an embodiment of this application.

[0179] As shown in Figure 9, the power consumption device 3000 according to the embodiment of this application includes a battery pack 2000, and the battery pack 2000 is the aforementioned battery pack 2000.

[0180] From the above structure, it can be seen that the power consumption device 3000 according to the embodiment of this application uses the aforementioned battery pack 2000, that is, the aforementioned battery cell 1000, in order to improve the safety of use of the power consumption device 3000, further extend the service life of the power consumption device 3000, and reduce the cost of use.

[0181] It should be noted that the power consumption device 3000 in this specification may be a vehicle, an energy storage cabinet, a ship, an aircraft, or the like.

[0182] Figures 1 and 2 both show six first connecting portions 121 for illustrative purposes. However, after reading the above technical solution, those skilled in the art will clearly understand that extending this solution to a technical solution involving a different number of first connecting portions 121 is also within the scope of this application.

[0183] The current collector 100, battery cell 1000, battery pack 2000, and other components of the power consumption device 3000 according to the embodiments of this application are known to those skilled in the art and will not be described in detail again herein.

[0184] While embodiments of this application have been shown and described, various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and objectives of this application, and those skilled in the art will understand that the scope of this application is defined by the claims and their equivalents. [Explanation of Symbols]

[0185] 1000 battery cells 100 Current collector 120 First connection area 121 First connection section 122 Central part 1221 Liquid injection port 1222 Through Port 1223 Deployment Ports 131 Second connection section 1311 Reinforcement part 1312 Avoidance Port 1313 Stopper protrusion 132 First Restriction 140 connecting piece 200 Jelly Rolls 300 cover plate 310 Second limiting portion 400 Casing 2000 Battery Pack 3000 power consumption equipment

Claims

1. A first connection region comprising a central portion and a plurality of first connection portions, wherein the plurality of first connection portions are arranged continuously in the circumferential direction of the central portion, are separately connected to the central portion, and are adapted to be electrically connected to a jelly roll; A second connection portion is located on one side of the first connection region and is electrically connected to the central portion, wherein the first connection region and the second connection portion have a height difference and are relatively movable, and the second connection portion is adapted to be electrically connected to the cover plate. A current collector equipped with the following features.

2. The current collector according to claim 1, wherein the current collector is a component formed by integral molding.

3. The current collector according to claim 1 or 2, wherein the second connecting portion forms an annular structure, is located radially outside the first connecting region in the radial direction of the second connecting portion, and the inner wall of the second connecting portion is connected to the central portion by using a connecting piece.

4. The current collector according to any one of claims 1 to 3, wherein the first connecting portion has a first surface connected to the jelly roll, and the second connecting portion has a second surface connected to the cover plate, and the first surface and the second surface are parallel to each other.

5. The current collector according to any one of claims 1 to 4, further comprising a connecting piece, wherein the connecting piece is connected between the second connecting portion and the central portion, extends diagonally toward the second connecting portion with respect to the central portion, and therefore the first connecting region and the second connecting portion have the height difference.

6. The current collector according to claim 5, wherein the range of the inclination angle between the connecting piece and the first plane is 5° ≤ a < 90°, and the first plane is perpendicular to the thickness direction of the current collector.

7. The current collector according to claim 5 or 6, wherein the orthographic projection of the outer peripheral wall of the current collector in the first plane is located on a circle, the first plane is perpendicular to the thickness direction of the current collector, a plurality of connecting pieces exist, and the plurality of first connecting portions and the plurality of connecting pieces are alternately spaced apart in the circumferential direction of the first connecting region.

8. The current collector according to claim 7, wherein the circumferential distance between the first connecting portion and the adjacent connecting portion piece is in the range of 0.5 mm to 2 mm.

9. The orthographic projection of the outer periphery wall of the current collector in the first plane is located on the circle, the first plane is perpendicular to the thickness direction of the current collector, and the minimum radius of the outer periphery wall of the current collector is R. １ And R １ The value is in the range of 10 mm to 100 mm. The maximum radius of the outer periphery wall of the first connection area is at least half of the minimum radius of the outer periphery wall of the current collector, and less than the minimum radius of the outer periphery wall of the current collector, i.e., the maximum value R of the radius of the outer periphery wall of the first connection area. ２ and R １ However, under the following conditions, namely 1 / 2R １ ≤R ２ <R １ A current collector according to any one of claims 1 to 8, which satisfies the following conditions.

10. The radial width of the second connection portion is W １ where W is 1 mm or more and is not more than half of the minimum value of the radius of the outer peripheral wall of the current collector, that is, 1 mm ≤ W １ ≤ 1 / 2R １ The current collector according to claim 9, which is such that.

11. The current collector according to any one of claims 1 to 10, wherein the orthographic projection of the outer peripheral wall of the current collector in the first plane is located on the circle, the first plane is perpendicular to the thickness direction of the current collector, the second connection portion is provided with a stopper projection extending toward the first connection portion, the stopper projection is located radially outward of the first connection portion and is adapted to be located radially outward of the tab of the jelly roll.

12. The current collector according to claim 11, wherein the stopper projection is defined by bending and deformation of a part of the second connecting portion.

13. The current collector according to claim 11 or 12, wherein the reinforcing portion is provided on the outer circumference of the stopper projection.

14. The current collector according to claim 13, wherein there are multiple reinforcing portions, the multiple reinforcing portions are spaced apart and form a relief port for gas flow between two adjacent reinforcing portions.

15. The current collector according to any one of claims 1 to 14, wherein the central portion is provided with a liquid injection port that penetrates the central portion in the thickness direction of the central portion.

16. The current collector according to any one of claims 1 to 15, wherein the first limiting portion is provided on the second connecting portion and is adapted to cooperate restrictively with the second limiting portion of the cover plate.

17. A casing having a containment cavity with an opening formed inside, A jelly roll is disposed in the aforementioned housing cavity, and a cover plate is disposed in the aforementioned opening. A current collector according to any one of claims 1 to 16, wherein the current collector is disposed between the jelly roll and the cover plate, the first connecting portion is electrically connected to the jelly roll, the second connecting portion is electrically connected to the cover plate, and the cover plate is adapted to drive the second connecting portion to move relative to the first connecting region, A battery cell equipped with the following features.

18. The battery cell according to claim 17, wherein the orthographic projection of the outer peripheral wall of the current collector in the first plane is located on the circle, the first plane is perpendicular to the thickness direction of the current collector, the second connection portion is provided with the stopper projection extending toward the first connection portion, the stopper projection is located radially outward of the first connection portion, and is located radially outward of the tab of the jelly roll.

19. A battery pack comprising a plurality of battery cells as described in claim 17 or 18.

20. A power consumption device comprising the battery pack described in claim 19.

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