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 of ​​the current collector includes an intermediate portion (122), a plurality of first connection portions (121) connected to the intermediate portion, and a jelly roll (200). The second connection portion is located on one side of the first connection area, connected to the intermediate portion using a connecting piece (140), and electrically connected to the housing. The inner circumferential walls of the first and second connection portions are spaced apart. The radial dimension of the orthographic projection of the spacing gap on the first plane is in the range of 0.5 mm to 2 mm.

Description

Technical Field

[0001] Cross - reference to related applications This application claims priority to Chinese Patent Application No. 2023209045515, entitled "Current Collector, Battery Cell, Battery Pack, and Power Consumption Device", 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 consumption devices. <目标语言= <目标语言=

[0003] <目标语言= Background Art<目标语言= In the prior art, in order to achieve electrical connection between a jelly roll and a housing, a current collector is usually disposed between the jelly roll and the housing. <目标语言= <目标语言=

[0004] [[ID=2,0]]<目标语言= However, when an existing current collector connects the jelly roll and the housing, it is necessary to bend the current collector. As a result, the connection efficiency of the current collector is low, and the current collector is likely to break during use. In addition, with existing current collectors, it is impossible to ensure the connection area between the current collector and the jelly roll and the connection area between the current collector and the housing. As a result, the operating performance of the battery cell deteriorates. <目标语言= <目标语言=

[0005] <目标语言= Summary of the Invention<目标语言= Therefore, this application provides a current collector. By using the current collector, the connection between the jelly roll and the housing can be realized without bending, and the connection area can be ensured, thus solving the technical problems of the prior art that it is necessary to bend the current collector during connection and the connection area is small. <目标语言= <目标语言=

[0006] <目标语言= According to the current collector of the embodiment of the present application, the orthographic projection of the outer circumferential wall of the current collector on a first plane lies on a first circle, and the first plane is perpendicular to the thickness direction of the current collector. The current collector comprises a first connection region including an intermediate portion and a plurality of first connection portions, the plurality of first connection portions being sequentially arranged in the circumferential direction of the intermediate portion, the plurality of first connection portions being separately connected to the intermediate portion, and each first connection portion being adapted to be electrically connected to a jelly roll; a second connection portion extending in the circumferential direction of the intermediate portion and located on one side of the first connection region; and a connecting piece connected between the second connection portion and the intermediate portion, wherein the inner circumferential walls of the first connection portion and the second connection portion are spaced apart to form a spacing gap, the value of the radial dimension G1 of the orthographic projection of the spacing gap on the first plane is in the range of 0.5 mm to 2 mm, and the second connection portion is electrically connected to the housing.

[0007] According to the current collector of the present invention, the inner circumferential walls of the first and second connection portions are spaced apart to form a spacing gap, and the value of the radial dimension G1 of the orthographic projection of the spacing gap on the first plane is set in the range of 0.5 mm to 2 mm, ensuring that the first and second connection portions can be efficiently separated and facilitating adjustment of the relative position between the first and second connection portions, that is, making it possible for the first and second connection regions to be relatively movable. In this way, an electrical connection between the jelly roll and the housing can be achieved without the need to bend the current collector, which is guaranteed to reduce the difficulty of connection, improve connection efficiency, and further help to increase the capacity of the jelly roll. In addition, the above setting can further ensure that both the first and second connection portions have a sufficient connection area, and as a result, the electrical connection between the jelly roll and the housing can be efficiently achieved by using the current collector, thereby guaranteeing connection quality and further improving the operating performance of the battery cell.

[0008] Optionally, the first connection portion and connecting piece are spaced apart in the circumferential direction of the current collector.

[0009] Optionally, the connecting piece extends obliquely towards the second connecting part with respect to the intermediate part, such that the first connecting region and the second connecting part have a height difference.

[0010] Optionally, the value of the radius R1 of the current collector is in the range of 10 mm to 100 mm.

[0011] Optionally, the orthographic projections of the outer peripheral walls of the plurality of first connecting parts on the first plane are all located on the second circle, and the radius R2 of the second circle and the radius R1 of the current collector satisfy the following condition, i.e., 1 / 2R1 ≤ R2 < R1.

[0012] Optionally, the second connecting part forms an annular structure, and the inner peripheral wall of the second connecting part is connected to the intermediate part using the connecting piece.

[0013] Optionally, the radial width of the second connecting part is W1, where 1 mm ≤ W1 ≤ 1 / 2R1, and R1 represents the radius of the current collector.

[0014] Optionally, there are a plurality of connecting pieces, the plurality of connecting pieces are evenly spaced apart, and the plurality of first connecting parts and the plurality of connecting pieces are alternately distributed in the circumferential direction of the current collector.

[0015] Optionally, the first connecting part has a first surface connected to the jelly roll, the second connecting part has a second surface connected to the housing, and the first surface and the second surface are parallel to each other.

[0016] Optionally, the second connecting part is provided with a stop protrusion extending towards the first connecting part, the stop protrusion is located radially outside the first connecting part, and the stop protrusion is adapted to be located radially outside the tab of the jelly roll.

[0017] Optionally, the stop protrusion is defined by a partial bending and deformation of the second connecting part.

[0018] Optionally, a first restricting portion is provided on the second connecting portion, and the first restricting portion is adapted to restrict cooperation with a second restricting portion on the housing.

[0019] Optionally, the first restricting portion is a restricting port that penetrates the second connecting portion in the thickness direction of the second connecting portion.

[0020] Optionally, the second connecting portion forms an annular structure, the orthographic projection of the restricting port on the first plane forms a rectangle, the circumferential length of the restricting port is G2, 0.5 mm ≤ G2 ≤ πR1 / n1, where R1 represents the radius of the current collector, n1 represents the number of restricting ports, and / or the radial width W3 of the restricting port satisfies the condition 0.5 mm ≤ W3 < W1, and the radial width of the second connecting portion is W1.

[0021] Optionally, a liquid injection port penetrating in the thickness direction of the intermediate portion may be provided in the intermediate portion.

[0022] A battery cell according to an embodiment of the present application includes a housing in which an accommodation cavity is formed, a jelly roll disposed in the accommodation cavity, and a current collector which is the aforementioned current collector and is disposed between the jelly roll and the housing, wherein a first connecting portion is electrically connected to the jelly roll and a second connecting portion is connected to the housing.

[0023] Since the battery cell according to the embodiment of the present application uses the aforementioned current collector, it can efficiently realize the electrical connection between the jelly roll and the housing, guarantee the connection quality, reduce the connection difficulty, ensure the operating performance of the battery cell, and further increase the capacity of the battery cell.

[0024] A battery pack according to an embodiment of the present application includes a plurality of the aforementioned battery cells.

[0025] Since the battery pack according to the embodiment of the present application uses the aforementioned battery cells, the manufacturing difficulty of the battery pack can be reduced, the manufacturing efficiency can be improved, and the operating performance of the battery pack can be guaranteed.

[0026] The power consumption device according to the embodiment of the present application includes the aforementioned battery pack.

[0027] The power consumption device according to the embodiment of the present application uses the aforementioned battery pack to guarantee the operating performance of the power consumption device, extend the service life of the power consumption device, and reduce the usage cost.

[0028] Further aspects and advantages of the present application will become apparent in the following description or will be learned from the implementation of the present application.

[0029] The above and / or additional aspects and advantages of the present application will become apparent from the description of the embodiments with reference to the following accompanying drawings and will be easily understood.

Brief Description of the Drawings

[0030] [Figure 1] It is a schematic diagram of the structure of a current collector according to some embodiments of the present application. [Figure 2] It is a top view of a current collector according to some embodiments of the present application. [Figure 3] It is a side view of a current collector according to some embodiments of the present application. [Figure 4] It is a local enlarged view of region I in FIG. 3. [Figure 5] It is a schematic diagram of the second connection part before and after movement according to some embodiments of the present application. [Figure 6] It is a top view of a current collector according to other embodiments of the present application. [Figure 7] It is a schematic diagram of the cooperation between a current collector and a cover plate according to other embodiments of the present application. [Figure 8] It is a cross-sectional view of a battery cell according to some embodiments of the present application. [Figure 9] This is a schematic diagram of a power consumption device according to several embodiments of the present application. [Explanation of Symbols]

[0031] 1000: Battery cell 100: Current collector 120: First connection area 121: First connection section 122: Middle part 1221: Liquid injection port 1222: Through port 1223: Positioning port 131: Second connection point 1311: Reinforced part 1312: Avoidance port 1313: Stop protrusion 132: First restriction 140: Connecting piece 150: Spacing Gap 200: Jelly Roll 300: Cover plate 310: Second restriction 400: Casing 500: Housing 2000: Battery pack 3000: Power consumption device [Modes for carrying out the invention]

[0032] The embodiments of this application will be described in detail below, and examples of embodiments will be 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 only to illustrate this application and should not be construed as limitations on this application.

[0033] In the description of this application, orientations or positional relationships indicated by terms such as “center,” “longitudinal,” “cross section,” “length,” “width,” “thickness,” “top,” “bottom,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “internal,” “external,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” are based on the orientations or positional relationships shown in the accompanying drawings and are merely for the purpose of describing and simplifying the description of this application, and should not be understood as implying or suggesting that the devices or elements referred to have a particular orientation or must be constructed and operated in a particular orientation, and therefore should not be understood as limitations to this application.

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

[0035] The orthogonal projection of the outer wall of the current collector 100 onto a first plane lies on a first circle, the first plane being perpendicular to the thickness direction of the current collector 100. In this specification, the thickness direction of the current collector 100 may also be understood as the height direction of the battery cell 1000. Therefore, the first plane may also be understood as a plane perpendicular to the height direction of the battery cell 1000. In other words, the orthogonal projection of the outer wall of the current collector 100 onto a plane perpendicular to the height direction of the battery cell 1000 lies on a first circle. In this way, the current collector 100 forms a shape similar to a circle, that is, the current collector 100 forms a shape similar to a circular current collector plate 100. The circular current collector 100 allows the shape of the current collector 100 to be adapted to the shape of the jelly roll 200 and housing 500, reducing the difficulty of connecting the current collector 100 to the jelly roll 200 and housing 500, increasing the connection area, and ensuring connection quality.

[0036] As shown in Figures 1 and 2, the current collector 100 according to the embodiment of this application includes a first connection area 120, a second connection portion 131, and a connecting piece 140.

[0037] The first connection region 120 includes an intermediate portion 122 and a plurality of first connection portions 121, as shown in Figures 1 and 2. The plurality of first connection portions 121 are arranged sequentially along the circumferential direction of the intermediate portion 122. The plurality of first connection portions 121 are connected separately to the intermediate portion 122. Each first connection portion 121 is adapted to be electrically connected to the jelly roll 200. Each first connection portion 121 is electrically connected to the jelly roll 200, ensuring a connection area between the first connection region 120 and the jelly roll 200, i.e., ensuring a connection area between the current collector 100 and the jelly roll 200, thereby improving the overcurrent performance of the current collector 100.

[0038] In the description of this application, unless otherwise specified, “multiple” means two or three or more.

[0039] Multiple first connection portions 121 are separately connected to the intermediate portion 122, and the intermediate portion 122 is used to support the multiple first connection portions 121, thereby improving the positional stability of the first connection portions 121 and ensuring the connection strength between the first connection region 120 and the jelly roll 200.

[0040] In some examples, the intermediate section 122 is also electrically connected to the jelly roll 200 to further secure the connection area between the first connection area 120 and the jelly roll 200. Of course, the intermediate section 122 may, alternatively, not be electrically connected to the jelly roll 200, and the intermediate section 122 may only perform a support function to ensure the support effect.

[0041] In addition, the multiple first connection portions 121 are arranged sequentially in the circumferential direction of the intermediate portion 122. In this way, it is ensured that all of the multiple first connection portions 121 can be connected to the intermediate portion 122. In this case, the intermediate portion 122 and the multiple first connection portions 121 support each other, ensuring the structural stability of the first connection region 120, and facilitating connection to the jelly roll 200 by using the first connection portions 121, thereby reducing the difficulty of connection. In addition, by appropriately utilizing the circumferential space of the intermediate portion 122, the area of ​​the first connection portions 121 can be increased, further increasing the connection area between the first connection portions 121 and the jelly roll 200, and improving the overcurrent capacity of the current collector 100.

[0042] As shown in Figures 1 and 2, the second connecting portion 131 extends circumferentially from the intermediate portion 122 and is located on one side of the first connecting region 120. The connecting piece 140 is connected between the second connecting portion 131 and the intermediate portion 122. The inner circumferential walls of the first connecting portion 121 and the second connecting portion 131 are spaced apart to form a spacing gap 150. The value of the radial dimension G1 of the orthogonal projection of the spacing gap 150 onto the first plane is between 0.5 mm and 2 mm. The second connecting portion 131 is electrically connected to the housing 500. Here, the inner circumferential walls of the first connecting portion 121 and the second connecting portion 131 are spaced apart, and a spacing gap 150 is formed between the inner circumferential walls of the first connecting portion 121 and the second connecting portion 131. The radial dimension of the orthographic projection image of the spacing gap 150 in a plane perpendicular to the height direction of the battery cell 1000 is G1, and the value of G1 is between 0.5 mm and 2 mm.

[0043] It should be noted that the inner circumferential wall of the second connection portion 131 can be understood as the circumferential wall on the side of the second connection portion 131 that is closer to the first connection portion 121.

[0044] Multiple second connection portions 131 are set to extend in the circumferential direction of the intermediate portion 122. In order to increase the area of ​​the second connection portions 131, the circumferential space of the intermediate portion 122 is utilized more rationally to further increase the connection area between the second connection portions 131 and the housing 500, thereby achieving a stable connection between the current collector 100 and the housing 500.

[0045] In addition, the second connecting portion 131 is positioned on one side of the first connecting portion 120 so as not to occupy the circumferential space of the second connecting portion 131, and so as not to occupy the circumferential space of the first connecting portion 120. In this way, there is enough space to position the first connecting portion 120 and the second connecting portion 131, thereby increasing the area of ​​the first connecting portion 121 and the second connecting portion 131, and further increasing the connection area between the first connecting portion 121 and the jelly roll 200 and between the second connecting portion 131 and the housing 500.

[0046] It should be noted that the placement of the connecting piece 140 enables a fixed connection between the second connection portion 131 and the first connection area 120, further reducing the difficulty of connecting the second connection portion 131 and the first connection area 120, and improving connection efficiency.

[0047] In a specific example, when manufacturing the current collector 100, the structure between the second connecting portion 131 and the intermediate portion 122 can be cut to form a connecting piece 140, and the connecting piece 140 can be bent to reduce the difficulty of molding the current collector 100 and improve the connection strength between the connecting piece 140 and the second connecting portion 131 and the intermediate portion 122.

[0048] The range of the orthogonal projection dimension of the spacing gap 150 in a plane perpendicular to the height direction of the battery cell 1000 is defined so that the first connection portion 121 and the second connection portion 131 are relatively movable and the area of ​​the first connection portion 121 and the second connection portion 131 can be secured.

[0049] From the structure described above, it can be seen that in the current collector 100 according to the embodiment of this application, a second connection portion 131 is provided, and in order to achieve an electrical connection between the second connection portion 131 and the first connection portion 121, the second connection portion 131 is configured to be connected to the intermediate portion 122 using a connecting piece 140. In this way, after the first connection portion 121 is connected to the jelly roll 200 and the second connection portion 131 is connected to the housing 500, the current collector 100 is used to achieve an electrical connection between the jelly roll 200 and the housing 500, thereby reducing the difficulty of connecting the jelly roll 200 and the housing 500.

[0050] In addition, a spacing gap 150 is formed between the inner circumferential walls of the first connection portion 121 and the second connection portion 131, and the value of the radial dimension G1 of the orthogonal projection image of the spacing gap 150 in a plane perpendicular to the height direction of the battery cell 1000 is set to 0.5 mm or more and 2 mm or less. When G1 is less than 0.5 mm, the distance between the first connection portion 121 and the second connection portion 131 is small, and a technical problem tends to arise to some extent in that the first connection portion 121 and the second connection portion 131 cannot be displaced relative to each other. In other words, the electrical connection between the jelly roll 200 and the housing cannot be achieved using the current collector 100. When G1 is greater than 2 mm, the area of ​​the first connection portion 121 and / or the area of ​​the second connection portion 131 becomes smaller. In other words, the connection area between the first connection portion 121 and the jelly roll 200 decreases, and / or the connection area between the second connection portion 131 and the housing decreases. As a result, the overcurrent performance of the current collector 100 deteriorates, and the positional stability of the current collector 100 after connection cannot be guaranteed.

[0051] Accordingly, in this application, the radial dimension G1 of the orthogonal projection of the spacing gap 150 formed on a plane perpendicular to the height direction of the battery cell 1000 by the separation of the inner circumferential walls of the first connecting portion 121 and the second connecting portion 131 is set in the range of 0.5 mm to 2 mm, thereby ensuring that the electrical connection between the jelly roll 200 and the housing can be efficiently achieved by the cooperation between the first connecting portion 121 and the second connecting portion 131, and further area of ​​the first connecting portion 121 and the second connecting portion 131 can be secured.

[0052] In other words, in this application, the distance between the first connection portion 121 and the second connection portion 131 is creatively set so that the first connection portion 121 and the second connection portion 131 are efficiently separated, the relative position of the first connection portion 121 and the second connection portion 131 can be easily adjusted, and it can be ensured that the first connection region 120 and the second connection portion 131 are relatively movable. In this way, assuming that the current collector 100 does not need to be bent, an electrical connection between the jelly roll 200 and the housing 500 can be achieved, reducing the bending process, improving assembly efficiency, preventing stress concentration caused by bending the current collector 100, thereby preventing damage to the current collector 100 and extending the service life of the current collector 100. In addition, it can be further ensured that both the first connection portion 121 and the second connection portion 131 have a sufficient connection area, and as a result, by using the current collector 100, an electrical connection between the jelly roll 200 and the housing 500 can be efficiently achieved, thereby improving the operating performance of the battery cell 1000.

[0053] In conclusion, in this application, the relative position between the first connection area 120 and the second connection portion 131 is creatively set, thereby enabling electrical connection between the jelly roll 200 and the housing 500 by using the current collector 100 without bending the structure of the current collector 100, thereby improving connection efficiency, increasing the capacity of the jelly roll 200, extending the service life of the current collector 100, and improving the structural strength of the current collector 100. In addition, the difficulty of manufacturing the current collector 100 can be further reduced, and the connection area of ​​the current collector 100 can be increased.

[0054] The current collector 100 of this application can achieve an electrical connection between the jelly roll 200 and the housing 500 without bending, and thus it will be understood that the current collector 100 differs from the prior art in that it has a simple structure and high connection efficiency. In addition, this further helps to increase the capacity of the jelly roll 200, prevents the possibility of soldering defects between the current collector 100 and the housing 500, and efficiently ensures the connection area between the current collector 100 and the jelly roll 200, and between the current collector 100 and the housing 500.

[0055] In conclusion, in this application, the orthographic radial dimension of the spacing gap 150 between the first connection portion 121 on a plane perpendicular to the height direction of the battery cell 1000 and the inner circumferential wall of the second connection portion 131 is creatively set such that the first connection region 120 and the second connection portion 131 are relatively movable, in this case, relatively movable can 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. In this way, in the connection process between the current collector 100 and the housing 500, the problem of a solder gap occurring between the current collector 100 and the housing 500 due to a change in the position of the housing 500 and the jelly roll 200 can be avoided, and the problem of a solder gap occurring between the current collector 100 and the housing 500 due to a large difference in the flatness of multiple soldering points on the housing 500 or a large difference in the flatness of the second connection portion 131 can be further avoided, thereby reducing the possibility of soldering defects between the current collector 100 and the housing 500 and ensuring the yield rate of the battery cells 1000. Note that the current collector 100 is usually made of a metallic conductive material such as copper, aluminum, or iron as a conductive element, and naturally has properties such as elasticity and deformation. Since the second connection portion 131 is located on one side of the first connection region 120, a change in position may occur between the first connection region 120 and the second connection portion 131 due to the action of an external force. In other words, when the housing 500 or cover plate is attached, the second connection portion 131 connected to the current collector 100 is pressed, allowing the second connection portion 131 and the first connection area 120 to move relative to each other.

[0056] Specifically, when the flatness of the connection surface between the housing 500 and the second connection portion 131 is large, the second connection portion 131 can adaptively adjust the relative position between the second connection portion 131 and the first connection portion 121 based on the flatness of the housing 500, thereby further improving the connection strength between the second connection portion 131 and the housing 500 and ensuring a tight fit between the relative contact surfaces of the second connection portion 131 and the housing 500.

[0057] It may also be understood herein that when the current collector 100 of this application is connected to the housing 500, the current collector 100 can use the second connection portion 131 to absorb manufacturing errors of the housing 500, thereby facilitating improvements in the manufacturing precision of the battery cells 1000 thereafter.

[0058] In other words, in this application, since the first connection area 120 and the second connection portion 131 are set to be relatively movable, a gap between the current collector 100 and the housing 500 can be efficiently prevented during connection of the current collector 100, eliminating the effects of assembly or manufacturing errors, further improving the connection strength between the current collector 100 and the housing 500, ensuring adhesion between the relative contact surfaces of the current collector 100 and the housing 500, thereby reducing the possibility of soldering defects, and subsequently ensuring the yield rate of the battery cells 1000.

[0059] In a specific example, since the first connection area 120 and the second connection portion 131 are relatively movable, when connecting the housing 500 and the jelly roll 200 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 are relatively movable, in this case, when connecting the second connection portion 131 to the housing 500, the position of the second connection portion 131 can be changed based on the position, shape, surface structure, etc., of the housing 500, thereby efficiently connecting the second connection portion 131 to the housing 500 and ensuring connection strength and connection area. In this way, the connection between the housing 500 and the jelly roll 200 is achieved using the current collector 100, reducing the possibility of soldering defects between the current collector 100 and the housing 500 and ensuring the yield rate of the battery cells 1000.

[0060] The connection between the first connection area 120 and the jelly roll 200, and the connection between the second connection portion 131 and the housing 500, may be made by soldering or adhesive.

[0061] The material of the current collector 100 can be optionally aluminum alloy, pure copper, nickel-plated copper, etc., thereby the current collector 100 has conductive properties, and by using the current collector 100, it facilitates the realization of an electrical connection between the jelly roll 200 and the housing 500.

[0062] In some examples, the jelly roll 200 includes tabs, and a plurality of first connecting parts 121 are electrically connected to the tabs to provide an electrical connection between the current collector 100 and the jelly roll 200.

[0063] It should be noted that the tabs described herein may be flat, full-tab structures obtained by kneading or pressing, or multi-tab structures obtained by laser cleaning or die-cutting.

[0064] If the material of the current collector 100 is an aluminum alloy, the current collector 100 is mainly connected in cooperation with 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 connected in cooperation with the negative electrode tab of the jelly roll 200. In other words, a person skilled in the art can select the material of the current collector 100 based on the application environment in which the current collector 100 is used. This is not particularly limited in this application.

[0065] In the description of this application, the features limited by “First” and “Second” may include one or more such features, either explicitly or implicitly, and are used to distinguish and describe features without any order or weighting.

[0066] In some examples, as shown in Figures 1 and 2, the second connecting portion 131 is positioned radially outward of the first connecting portion 121 in order to appropriately position the relative positions between the first connecting portion 121 and the second connecting portion 131 and to ensure the area of ​​both the first and second connecting portions 121 and 131.

[0067] In some specific examples, the radial dimension G1 of the orthogonal projection of the spacing gap 150 between the inner circumferential walls of the first connection portion 121 and the second connection portion 131 on 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.

[0068] In some examples, the current collector 100 is a component formed by integral molding. By manufacturing the entire current collector 100 in this way by an integral molding process, the difficulty of manufacturing the current collector 100 is reduced, manufacturing efficiency is improved, and the connection strength and quality between the intermediate portion 122, the first connection portion 121, and the second connection portion 131 can be guaranteed. As a result, the current collector 100 has a stable structure, and the electrical connection between the jelly roll 200 and the housing 500 is achieved by using the current collector 100.

[0069] It should be noted that in the manufacturing process of the current collector 100, the current collector 100 can be cut and structures such as the intermediate portion 122, the first connecting portion 121, and the second connecting portion 131 can be formed on the current collector 100.

[0070] In some embodiments of this application, as shown in Figure 2, the first connecting portion 121 and the connecting piece 140 are spaced apart in the circumferential direction of the current collector 100. Here, if the current collector 100 is formed similarly to a circular current collector 100, it will be understood that since the first connecting portion 121 and the connecting piece 140 are spaced apart in the circumferential direction of the current collector 100, the connecting piece 140 does not obstruct the separation between the first connecting portion 121 and the second connecting portion 131. In other words, by efficiently separating the first connecting portion 121 and the second connecting portion 131, it is ensured that the relative positions of the first connecting portion 121 and the second connecting portion 131 can be easily adjusted, and that an electrical connection between the jelly roll 200 and the housing 500 can be reliably achieved, provided that the current collector 100 does not need to be bent.

[0071] Optionally, the circumferential distance between the first connecting portion 121 and the connecting piece 140 is in the range of 0.5 mm to 2 mm. In other words, by having the distance between the first connecting portion 121 and the connecting piece 140 in the circumferential direction of the current collector 100 be between 0.5 mm and 2 mm, the connecting piece 140 and the first connecting portion 121 are separated, and the relative position of the first connecting portion 121 and the second connecting portion 131 can be efficiently adjusted. In this way, the first connecting portion 121 and the second connecting portion 131 are relatively movable, facilitating the realization of an electrical connection between the jelly roll 200 and the housing 500 using the current collector 100.

[0072] In some embodiments of this application, as shown in Figures 1 and 3, the connecting piece 140 extends diagonally toward the second connecting piece 131 relative to the intermediate piece 122, resulting in a height difference between the first connecting region 120 and the second connecting piece 131. Here, it will also be understood that the connecting piece 140 is connected to the intermediate piece 122, positioned diagonally toward the intermediate piece 122, and extends diagonally toward the second connecting piece 131. In this way, when the intermediate piece 122 and the second connecting piece 131 are fixedly connected using the connecting piece 140, it can be further ensured that the intermediate piece 122 and the second connecting piece 131 are spaced apart in the height direction of the battery cell 1000 after the connection using the connecting piece 140. In other words, the height difference between the first connecting region 120 and the second connecting piece 131 facilitates the realization of an electrical connection between the jelly roll 200 and the housing 500 using the current collector 100.

[0073] It should be noted that the aforementioned height difference can be understood as the first connection area 120 and the second connection portion 131 being separated in the height direction of the battery cell 1000. In other words, the first connection area 120 and the second connection portion 131 are located at different heights in the battery cell 1000.

[0074] It should be further noted that in conventional technology, the jelly roll 200 and the housing 500 are spaced apart. As a result, a certain height exists between the jelly roll 200 and the housing 500. In this application, the first connection area 120 and the second connection portion 131 are set to have a certain height difference. In this way, the current collector 100 can have a certain height, and by using the current collector 100, an electrical connection is achieved between the jelly roll 200 and the housing 500. In addition, since the height is not increased by bending the current collector 100, the bending process is reduced, connection efficiency is improved, damage to the current collector 100 can be prevented, stress concentration caused by bending of the current collector 100 can be prevented, the service life of the current collector 100 is extended, and the structural strength of the current collector 100 is improved.

[0075] In addition, in this application, the first connection region 120 and the second connection portion 131 are set to have a specific height difference directly. Compared to increasing the height by bending the current collector, this reduces the space occupied by the current collector 100 in the height direction. In this way, the height of the jelly roll 200 can be correspondingly increased, thereby increasing the capacity of the jelly roll 200, that is, increasing the capacity of the battery cell 1000.

[0076] In other words, in this application, the relative position between the first connection area 120 and the second connection portion 131 is creatively set, and as a result, electrical connection between the jelly roll 200 and the housing 500 can be achieved by using the current collector 100 without bending the structure of the current collector 100, improving connection efficiency, further preventing damage to the current collector 100, extending the service life of the current collector 100, and improving the structural strength of the current collector 100. In addition, the difficulty of manufacturing the current collector 100 can be further reduced and the capacity of the jelly roll 200 can be further increased.

[0077] In a specific example, since the first connection area 120 and the second connection portion 131 have a height difference, when connecting the housing 500 and the jelly roll 200 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 connecting the first connection area 120 to the jelly roll 200 in a fixed position, the second connection portion 131 can be positioned closer to the housing 500 during the process of attaching the housing 500, thereby reducing the difficulty of connecting the second connection portion 131 to the housing 500.

[0078] 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 relative 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, the height of the current collector 100 is changed, and the range of use of the current collector 100 is extended. It should be noted that the current collector 100, as a conductive element, is usually made of a metallic conductive material such as copper, aluminum, or iron, and naturally has properties such as elasticity and deformation. The connecting piece 140 is configured as a diagonally extending plate, which further facilitates the realization of movement and / or deformation and further facilitates the adjustment of the relative movement of the position of the second connecting portion 131.

[0079] The movement and / or deformation described herein may be understood as the connecting piece 140 being configured to be movable relative to the first connecting portion 121, or to be configured to be deformable relative to the first connecting portion 121, or to be configured to be movable and deformable relative to the first connecting portion 121, thereby allowing the height difference between the first connecting portion 121 and the second connecting portion 131 to be changed using the connecting piece 140, making the first connecting region 120 and the second connecting portion 131 relatively movable, and adjusting the position of the second connecting portion 131 relative to the first connecting portion 121, i.e., adjusting the relative position of the second connecting portion 131 and the housing 500.

[0080] In conclusion, the first connection region 120 and the second connection portion 131 of this application have a height difference and are relatively movable, which facilitates the realization of an electrical connection between the jelly roll 200 and the housing 500 using the current collector 100 and improves the capacity of the battery cell 1000.

[0081] In a specific example, since the first connection area 120 and the second connection part 131 have a height difference and are relatively movable, when connecting the housing 500 and the jelly roll 200 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 part 131 have a height difference in the height direction of the battery cell 1000, after connecting the first connection area 120 to the jelly roll 200 in a fixed position, the second connection part 131 can be positioned closer to the housing 500 during the process of attaching the housing 500, thereby reducing the difficulty of connecting the second connection part 131 and the housing 500. In addition, since the first connection area 120 and the second connection portion 131 are relatively movable, in this case, when connecting the second connection portion 131 to the housing 500, the position of the second connection portion 131 can be changed based on the position, shape, surface structure, etc. of the housing 500, thereby efficiently connecting the second connection portion 131 to the housing 500 and ensuring connection strength and connection area. In this way, the connection between the housing 500 and the jelly roll 200 is achieved using the current collector 100, reducing the possibility of soldering defects between the current collector 100 and the housing 500 and ensuring the yield rate of the battery cells 1000.

[0082] In a specific example, the connecting piece 140 is formed as a rectangular plate, which facilitates the realization of a fixed connection between the second connecting portion 131 and the intermediate portion 122 by using the connecting piece 140, ensures that the second connecting portion 131 can be positioned radially outward of the first connecting region 120 after the connection is completed, and ensures that the second connecting portion 131 can be driven and operated by the connecting piece 140 under the action of an external force.

[0083] Of course, in some other examples, the connecting piece 140 may be further formed, such as a square plate, a fan-shaped plate, etc. This is not particularly limited in this application.

[0084] 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 housing 500 separately, if there is a manufacturing error in the housing 500, the soldering point protruding toward the jelly roll 200 generates a force that moves the corresponding second connecting portion 131 toward the jelly roll 200. The second connecting portion 131 is connected to the first connecting portion 121 using a diagonally extending plate body. Since the diagonally extending plate body tends to change position and deform under external force, when the housing 500 drives the corresponding second connecting portion 131 to move toward the jelly roll 200, the second connecting portion 131 can be driven and actuated by the diagonally extending plate body. This ensures that the second connecting portion 131 is moved efficiently, that is, that the second connecting portion 131 can change position based on the position of the housing 500. As a result, the second connecting portion 131 can be connected to the housing 500, preventing a cooperative gap between the second connecting portion 131 and the housing 500. In this way, the degree of contact between the relative contact surfaces of the current collector 100 and the housing 500 is ensured, and the possibility of soldering defects is reduced.

[0085] As described above, the second connecting portion 131 can be operated by driving the diagonally extending plate body, and it should be noted that the specific actions of the plate body are that the second connecting portion 131 can move one end of the plate body, which is connected to the second connecting portion 131, toward the jelly roll 200, and in the process of moving one end of the plate body, fix the other end of the plate body toward the jelly roll 200, thereby rotating the entire plate body toward the jelly roll 200 and realizing the movement of the connecting piece 140 toward the first connecting portion 121. Alternatively, the second connecting portion 131 can drive one end of the plate body, which is connected to the second connecting portion 131, to bend it toward the jelly roll 200, and in the bending process, fix the other end of the plate body toward the jelly roll 200, thereby realizing the deformation of the connecting piece 140 toward the first connecting portion 121.

[0086] Figure 5 is a schematic diagram of the second connection section 131 before and after movement. The solid line indicates the position of the second connection section 131 before movement, and the dashed line indicates the position of the second connection section 131 after movement.

[0087] 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 achieved by using the connecting piece 140, ensuring that the second connection portion 131 can efficiently drive the diagonally extending connecting piece 140 to act under external force, that is, the connecting piece 140 is efficiently movable and / or deformable relative to the first connection region 120 to change the height difference between the first connection region 120 and the second connection portion 131.

[0088] 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 efficiently connect the first connection area 120 and the second connection portion 131, and that the second connection portion 131 can efficiently drive and operate the diagonally extending connecting piece 140 under the action of an external force.

[0089] Of course, 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 configured to be movable and / or deformable relative to the first connecting region 120 in order to change the height difference between the first connecting region 120 and the second connecting portion 131.

[0090] In a specific example, if the connecting piece 140 is a buffer spring and the current collector 100 is used to connect the jelly roll 200 and the housing 500 separately, and there is a large difference in the flatness of multiple soldering points on the housing 500, the soldering points protruding toward the jelly roll 200 will generate a force that moves the corresponding second connecting portion 131 toward the jelly roll 200, and the second connecting portion 131 will compress and deform the buffer spring in order to change the height difference between the first connecting region 120 and the second connecting portion 131.

[0091] In some cases, as shown in Figures 1 and 3, the range of the inclination angle of the connecting piece 140 relative to the intermediate portion 122 is 5° ≤ a < 90°. If the range of the inclination angle of the connecting piece 140 relative to the intermediate portion 122 is less than 5°, the overall height of the current collector 100 becomes low, and as a result, it is not possible to efficiently achieve an electrical connection between the jelly roll 200 and the housing 500 using the current collector 100. If the range of the inclination angle of the connecting piece 140 relative to the intermediate portion 122 is 90° or more, the overall height of the current collector 100 becomes high, and the space occupied by the current collector 100 increases. As a result, the current collector 100 occupies space for the jelly roll 200, and the capacity of the jelly roll 200 decreases. In addition, the connecting piece 140 cannot efficiently drive and move the second connection portion 131. In other words, it is not possible to efficiently change the height difference between the first connection area 120 and the second connection portion 131 using the connecting piece 140. As a result, the problem of soldering defects caused by manufacturing tolerances cannot be resolved.

[0092] Therefore, in this application, the range of the inclination angle a of the connecting piece 140 with respect to the intermediate portion 122 is set to 5° ≤ a < 90°, which ensures that the electrical connection between the jelly roll 200 and the housing 500 can be efficiently achieved by using the current collector 100, and the height difference between the first connection area 120 and the second connection portion 131 can be changed more efficiently by using the connecting piece 140, so that the overall height of the current collector 100 does not become excessively high and the capacity of the jelly roll 200 is ensured.

[0093] In a specific example, the inclination angle a of the connecting piece 140 relative to the intermediate portion 122 may be 5°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, etc.

[0094] 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 a of the connecting piece 140. By setting the height between the first connection area 120 and the second connection portion 131 to a range of 1 mm to 10 mm, it can be ensured that the inclination angle a of the connecting piece 140 relative to the first connection portion 121 can be in the range of 5° to 90°. In this way, by using the connecting piece 140, the height difference between the first connection area 120 and the second connection portion 131 can be efficiently changed, ensuring that the overall height of the current collector 100 does not become excessively high and that the capacity of the jelly roll 200 is ensured.

[0095] 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.

[0096] It should be noted that the aforementioned height between the first connection area 120 and the second connection portion 131 can be understood as the distance between the opposing surfaces of the second connection portion 131 and the first connection portion 121 in the height direction of the battery cell 1000.

[0097] Optionally, as shown in Figures 1 and 2, there are multiple connecting pieces 140, which are spaced at equal intervals, and each connecting piece 140 is formed as a diagonally extending flat plate. The arrangement of multiple connecting pieces 140 allows them to cooperate to increase the connection strength between the second connection portion 131 and the intermediate portion 122, thereby stabilizing the position of the second connection portion 131 and ensuring that the second connection portion 131 and the first connection region 120 can have a height difference and are relatively movable.

[0098] Specifically, referring to Figures 1 and 2, the first connection region 120 includes an intermediate portion 122 and a plurality of first connection portions 121. The intermediate portion 122 is formed from a circular aluminum plate or a circular copper plate, and the first connection portions 121 are formed from a fan-shaped aluminum plate or a fan-shaped copper plate. The plurality of first connection portions 121 are arranged on the outer periphery of the intermediate portion 122 and are connected to the intermediate portion 122 separately, and the plurality of first connection portions 121 are spaced apart. Between two adjacent first connection portions 121, a connecting piece 140 made of a rectangular aluminum plate or a rectangular copper plate is placed. In the circumferential direction of the first connection region 120, the connecting piece 140 and the first radial end of the first connection region 120 are spaced apart, and the first end of the connecting piece 140, which is the first radial end of the first connection region 120, is connected to the intermediate portion 122.

[0099] Referring to Figures 1 and 2, the second connecting portion 131 is formed as an annular aluminum plate or an annular copper plate, and the second connecting portion 131 is positioned on the outer circumference of the first connecting region 120, and the second end of the connecting piece 140, which is the second radial end of the first connecting region 120, is connected to the second connecting portion 131, and since the connecting piece 140 extends obliquely to the first connecting region 120, the first connecting region 120 and the second connecting portion 131 are spaced apart in the height direction of the battery cell 1000.

[0100] In a specific example, when the current collector 100 is used to connect the jelly roll 200 and the housing 500 separately, the first connection area 120 is first connected to the jelly roll 200. Because there is a height difference between the first connection area 120 and the second connection area 131 in the height direction of the battery cell 1000, the housing 500 can be efficiently brought into contact with the second connection area 131 and linked during the housing 500 installation process. In addition, in the process of connecting the housing 500 to the second connection portion 131, if there is a soldering point on the housing 500 that protrudes toward the jelly roll 200, the soldering point moves toward the jelly roll 200 by driving the second connection portion 131, and the second connection portion 131 moves toward the jelly roll 200 by driving the second end of the connecting piece 140 to rotate it around the first end toward the jelly roll 200, or by driving the second end of the connecting piece 140 to bend it toward the jelly roll 200, thereby using the housing 500 to drive the connecting piece 140 to move and / or deform it toward the first connection area 120, thereby changing the height of the current collector 100, allowing the current collector 100 to be efficiently connected to the housing 500, ensuring adhesion between the relative contact surfaces of the current collector 100 and the housing 500, and reducing the possibility of soldering defects.

[0101] Optionally, as shown in Figures 1 and 2, the multiple first connecting portions 121 and the multiple connecting pieces 140 can be alternately distributed in the circumferential direction of the current collector 100. Here, if the current collector 100 is formed as a circular current collector, it will also be understood that the multiple first connecting portions 121 and the multiple connecting pieces 140 are alternately spaced apart within the first connecting region 120 in the circumferential direction of the current collector 100. Alternate spacing means that one connecting piece 140 is placed between two adjacent first connecting portions 121, and correspondingly, one first connecting portion 121 is placed between two adjacent connecting pieces 140, thereby making proper use of the space of the current collector 100 and allowing multiple first connecting portions 121 and multiple connecting pieces 140 to be placed on the same current collector 100 simultaneously. This makes it easy to increase the overcurrent area of ​​the current collector 100 using multiple first connection parts 121, and allows the second connection part 131 to be reliably connected to the intermediate part 122 using the connecting piece 140.

[0102] In some examples, as shown in Figure 2, multiple first connecting portions 121 are arranged at intervals in the circumferential direction of the current collector 100, and connecting pieces 140 are placed between two adjacent first connecting portions 121, so that multiple first connecting portions 121 and multiple connecting pieces 140 are alternately arranged in the circumferential direction of the intermediate portion 122, and multiple first connecting portions 121 and multiple connecting pieces 140 are simultaneously placed on the current collector 100.

[0103] In some examples, as shown in Figure 2, the distance between the opposing side walls of each first connection portion 121 gradually increases away from the intermediate portion 122. In this way, the area of ​​the first connection portion 121 is increased, ensuring that the first connection portion 121 has a sufficient contact area with the tab of the jelly roll 200, thereby ensuring that the current collector 100 has a large overcurrent area and preventing undercurrent in the jelly roll 200 caused by a small overcurrent area of ​​the current collector 100. This further avoids serious overheating problems in the jelly roll 200, extends the service life of the jelly roll 200, and improves the safety of use of the jelly roll 200.

[0104] In some examples, the first connecting portion 121 may form a sector shape in Figure 2. The sector shape allows the area of ​​the first connecting portion 121 to be increased by gradually increasing the distance between the opposing side walls of the first connecting portion 121 in the direction away from the intermediate portion 122.

[0105] Of course, in some other examples, the first connecting portion 121 may alternatively form a triangle, rectangle, circle, etc. This is not particularly limited in this application.

[0106] Optionally, as shown in Figure 2, the value of the radius R1 of the current collector 100 is in the range of 10 mm to 100 mm. Since the orthographic projection of the outer wall of the current collector 100 on a plane perpendicular to the thickness direction of the current collector 100 lies on the first circle, the radius of the current collector 100 is directly defined to ensure that the size of the current collector 100 can be adapted to the size of the jelly roll 200 and the housing 500, thereby facilitating electrical connection between the jelly roll 200 and the housing 500 using the current collector 100 and ensuring that the current collector 100 has a sufficient connection area with the jelly roll 200 and the housing 500.

[0107] Of course, 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 can define the radius of the current collector 100 based on the actual area of ​​the jelly roll 200 and the housing 500 in order to ensure that the current collector 100 has sufficient contact area with the jelly roll 200 and the housing 500.

[0108] Optionally, as shown in FIG. 2, the orthographic projections of the outer peripheral walls of the plurality of first connection portions 121 on the first plane are all located on the second circle, and the radius R2 of the second circle and the radius R1 of the current collector 100 satisfy the following condition, that is, 1 / 2R1≦R2<R1. Since the first plane is perpendicular to the thickness direction of the current collector 100, the orthographic projection images of the outer peripheral walls of the plurality of first connection portions 121 on the first plane are all set to be located on the second circle. It should be noted that the first connection region 120 has a shape similar to a disc. The disc shape enables the shape of the current collector 100 to conform to the shape of the jelly roll 200, thereby reducing the difficulty in connecting the current collector 100 and the jelly roll 200, increasing the connection area, and ensuring the connection quality.

[0109] R2 is set to be less than R1 to facilitate securing a specific arrangement space for the second connection portion 131, so that the second connection portion 131 has a specific area, thereby ensuring an increase in the connection area between the second connection portion 131 and the housing 500. R2 is set to be not less than 1 / 2R1, so that the first connection region 120 has a specific area, thereby ensuring an increase in the connection area between the first connection region 120 and the jelly roll 200.

[0110] In other words, in the present application, the relationship between R2 and R1 is set to ensure that both the first connection portion 121 and the second connection portion 131 have a specific connection area, thereby realizing a fixed connection between the current collector 100 and the jelly roll 200 and a fixed connection between the current collector 100 and the housing 500, and ensuring that the current collector 100 has a large overcurrent area.

[0111] In some specific examples, referring to FIGS. 1 and 2, the intermediate portion 122 forms a circular support plate, and all of the plurality of first connection portions 121 are formed as fan-shaped connection plates. The plurality of first connection portions 121 are connected to the outer side in the radial direction of the intermediate portion 122 and are circumferentially spaced apart from the intermediate portion 122. In this way, after the connection between the plurality of first connection portions 121 and the intermediate portion 122 is completed, the first connection region 120 can form a disc shape. As a result, the first connection region 120 conforms to the shape of the jelly roll 200, increasing the connection area between the first connection region 120 and the jelly roll 200.

[0112] Optionally, as shown in FIG. 3, the radius of the intermediate portion 122 is R3, and 5 mm < R3 < 1 / 2R2. It should be noted that the radius of the intermediate portion 122 in this specification can also be understood as the radial dimension of the intermediate portion 122 when the intermediate portion 122 is formed as a circular support plate. Since the radius of the first connection region 120 is a fixed value, the relationship between the radius R3 of the intermediate portion 122 and R2 is set to ensure that both the first connection portion 121 and the intermediate portion 122 have a specific connection area, thereby realizing a fixed connection between the current collector 100 and the jelly roll 200 and ensuring that the current collector 100 has a large overcurrent area.

[0113] In some embodiments of the present application, as shown in FIGS. 1 and 2, the second connection portion 131 forms an annular structure, and the inner peripheral wall of the second connection portion 131 is connected to the intermediate portion 122 using the connection piece 140. The inner peripheral wall of the second connection portion 131 described in this specification can be understood as the peripheral wall of the second connection portion 131 and the peripheral wall close to the first connection region 120. The inner peripheral wall of the second connection portion 131 is connected to the intermediate portion 122 using the connection piece 140 to realize a fixed connection between the second connection portion 131 and the intermediate portion 122, facilitating the support of the second connection portion 131 using the intermediate portion 122, improving the positional stability of the second connection portion 131, and facilitating the realization of the electrical connection between the current collector 100 using the second connection portion 131 and the housing 500.

[0114] It should be noted that the second connecting portion 131 is configured to form an annular structure, and by being configured to extend in the circumferential direction of the first connecting region 120, the second connecting portion 131 can secure its area. In addition, the annular structure can further increase the structural strength of the second connecting portion 131 and extend its service life.

[0115] In addition, since the second connecting portion 131 forms an annular structure, the second connecting portion 131 is formed as an integrated part, making it easier to process and reducing the difficulty of manufacturing the second connecting portion 131.

[0116] In addition, by making the second connecting portion 131 an annular structure, the entire circumference of the second connecting portion 131 can be connected to the housing 500 without providing a separate error correction mechanism during the process of connecting the second connecting portion 131 to the housing 500, thereby reducing the difficulty of connecting the second connecting portion 131 and the housing 500.

[0117] In other words, in this application, by making the second connecting portion 131 an annular structure, the second connecting portion 131 has a large connection area, which improves the structural strength of the second connecting portion 131, extends the service life of the second connecting portion 131, reduces the difficulty of manufacturing the second connecting portion 131, and reduces the difficulty of connecting the second connecting portion 131 to the housing 500.

[0118] In a specific example, the second connecting portion 131 is formed as an annular plate, and the annular plate is made of a conductive material such as aluminum or copper, facilitating the electrical connection between the second connecting portion 131 and the housing 500.

[0119] In some examples, the inner diameter of the second connecting portion 131 is larger than the outer diameter of the first connecting region 120, and as a result, the second connecting portion 131 is positioned radially outward from the first connecting region 120, increasing the area of ​​both the first connecting portion 121 and the second connecting portion 131.

[0120] Optionally, as shown in Figure 2, the radial width of the second connection portion 131 is W1, where 1 mm ≤ W1 ≤ 1 / 2R1, and R1 represents the radius of the current collector 100. The radial width of the second connection portion 131 described herein will be understood as the width of the second connection portion 131 extending radially from the current collector 100 when the current collector 100 has a shape similar to a circle. In some examples, the second connection portion 131 is positioned radially outward from the first connection portion 121, and the radius of the current collector 100 is fixed. Thus, the aforementioned arrangement facilitates the realization of an electrical connection between the jelly roll 200 and the housing 500 using the current collector 100 by ensuring that the connection area of ​​the second connection portion 131 meets the minimum connection requirements and that the first connection portion 121 has a sufficient connection area.

[0121] In some embodiments of this application, a first connecting portion 121 has a first surface connected to the jelly roll 200, and a second connecting portion 131 has a second surface connected to the housing 500, with the first and second surfaces being parallel to each other. It will be understood herein that the first connecting portion 121 has a first surface and is adapted to be connected to the jelly roll 200 via the first surface, thereby achieving 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 be connected to the housing 500 via the second surface, thereby achieving an electrical connection between the second connecting portion 131 and the housing 500, and a current collector 100 is used to achieve an electrical connection between the jelly roll 200 and the housing 500.

[0122] In the process of assembling the battery cell 1000, it should be noted that the side of the jelly roll 200 that faces the housing 500 is usually set parallel to the side of the housing 500 that faces the jelly roll 200. Therefore, in this application, the first surface and the second surface are set parallel to each other, thereby enabling efficient connection of the second surface to the housing 500 after the connection between the first surface and the jelly roll 200 is completed. This ensures 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 housing 500 is secured, thereby enabling efficient electrical connection between the jelly roll 200 and the housing 500 and reducing the difficulty of connection.

[0123] In some examples, the surface of the first connection portion 121 that faces the jelly roll 200 is defined as the first surface, facilitating the interconnection between the first surface and the jelly roll 200. Correspondingly, the surface of the second connection portion 131 that faces the cover plate 300 is defined as the second surface, facilitating the interconnection between the second surface and the housing 500.

[0124] In some embodiments of this application, as shown in Figures 1, 2, and 4, the second connecting portion 131 is provided with a stop projection 1313. The stop projection 1313 extends toward the first connecting portion 121. The stop projection 1313 is located radially outward of the first connecting portion 121. The stop projection 1313 is adapted to be positioned radially outward of the tab of the jelly roll 200. Radially outward of the first connecting portion 121 as described herein can be understood as the side of the first connecting portion 121 that is closer to the radially outward of the current collector 100, when the current collector 100 has a shape similar to a circle. The stop projection 1313 can serve to reinforce the second connecting portion 131, i.e., to improve the structural strength of the second connecting portion 131, and ensure that the second connecting portion 131 can be stably connected to the housing 500 by preventing deformation when the second connecting portion 131 is connected to the housing 500. In addition, the stop projection 1313 facilitates the positioning of the tab by using the second connecting portion 131, thereby allowing the tab to be stably positioned on the jelly roll 200 and preventing malfunctions of the jelly roll 200 caused by loosening of the tab and pulling of the solder joint under actual working conditions.

[0125] Furthermore, the position of the tab may be further defined by the cooperation of the stop projections 1313, further ensuring that the tab can be stably positioned on the jelly roll 200. In addition, the cooperation of multiple stop projections 1313 further protects the tab, thereby extending the service life of the tab, and thus the service life of the jelly roll 200.

[0126] Optionally, as shown in Figures 1 and 2, the stop projection 1313 extends circumferentially around the second connection portion 131, which can also be understood as the stop projection 1313 extending circumferentially around the current collector 100 forming a circle, thereby increasing the area of ​​the stop projection 1313 and ensuring that the stop projection 1313 efficiently improves the structural strength of the second connection portion 131. In addition, it can be further ensured that the tab can be stably positioned on the jelly roll 200 by ensuring that the stop projection 1313 can efficiently define the position of the tab.

[0127] Of course, in some other examples, there are multiple stop protrusions 1313, which are spaced apart circumferentially around the second connecting portion 131. In this way, the stop 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.

[0128] Optionally, the length of the extension of the stop projection 1313 toward the first connection portion 121 is greater than or equal to the exposed height of the tab, thereby ensuring that the stop projection 1313 can effectively protect the tab and define the position of the tab.

[0129] 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 stop projection 1313 extending toward the first connection portion 121 is greater than 0.5 mm.

[0130] Optionally, the stop 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 stop projection 1313. In this way, since it is not necessary to connect structural members separately to the second connecting portion 131 in order to form the stop projection 1313, the manufacturing difficulty of the stop projection 1313, and thus the manufacturing difficulty of the second connecting portion 131, can be reduced. In addition, the positional stability of the stop projection 1313 can be further improved.

[0131] In some embodiments of this application, as shown in Figures 1 and 2, a plurality of avoidance ports 1312 for fluid flow are further provided on the outer circumference of the second connection portion 131. The avoidance ports 1312 are configured to enable communication between the two ends of the second connection portion 131 in order to ensure that gas flows smoothly within the jelly roll 200.

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

[0133] Since the multiple avoidance ports 1312 are evenly spaced apart, as shown in Figure 2, the multiple avoidance ports 1312 can cooperate to ensure that the gas distribution within the jelly roll 200 becomes more uniform.

[0134] Note that Figure 2 shows that the avoidance port 1312 has a shape similar to a rectangle. In some other examples, the avoidance port 1312 may alternatively form a circle, triangle, etc. This is not particularly 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 those skilled in the art can set the number based on the amount of gas generated in the jelly roll 200.

[0136] Optionally, the width of the bypass port 1312 is W2, where 0.5 mm ≤ W2 ≤ 5 mm. It should be noted that the width of the bypass port 1312 as described herein may be understood as the width of the bypass port 1312 extending radially from the current collector 100. When W2 < 0.5 mm, the exhaust capacity of the bypass port 1312 is reduced. When W2 > 5 mm, the manufacturing difficulty of the bypass port 1312 increases and affects the connection area between the second connection portion 131 and the housing 500.

[0137] Therefore, in this application, by setting the radial width W2 of the avoidance port 1312 to 0.5 mm or more and 5 mm or less, the gas inside the jelly roll 200 can be smoothly discharged from the avoidance port 1312, and it is possible to further ensure that the avoidance port 1312 can be formed more favorably. 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 housing 500 is secured.

[0138] Optionally, a reinforcing portion 1311 is provided on the outer circumference of the stop projection 1313, as shown in Figures 1 and 2. The reinforcing portion 1311 is configured to improve the structural strength of the stop projection 1313 and the second connecting portion 131, prevent deformation when the second connecting portion 131 is connected to the housing 500, and further ensure that the stop projection 1313 efficiently protects the tab and defines the position of the tab.

[0139] Optionally, as shown in Figures 2, 3, and 4, there are multiple reinforcing portions 1311, which are spaced apart. The multiple reinforcing portions 1311 cooperate to maximize the structural strength of the stop projection 1313 and the second connecting portion 131.

[0140] Optionally, as shown in Figures 2 and 3, the bypass port 1312 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 provide the bypass port 1312 on the outer circumference of the second connecting portion 131, eliminating the need to separately machine the second connecting portion 131 to form the bypass port 1312. This reduces the manufacturing difficulty of the bypass port 1312, i.e., reduces the manufacturing difficulty of the second connecting portion 131, and further improves the manufacturing efficiency of the second connecting portion 131.

[0141] Optionally, as shown in Figures 6 and 7, the first limiting portion 132 is provided on the second connecting portion 131, and the first limiting portion 132 is adapted to restrict cooperation with the second limiting portion 310 on the housing 500. In other words, the second limiting portion 310 is provided on the housing 500, and the first limiting portion 132 is provided on the second connecting portion 131. After the cooperation between the second limiting portion 310 and the first limiting portion 132 is restricted, the cooperation between the second connecting portion 131 and the housing 500 is restricted, thereby avoiding changes in the relative position between the second connecting portion 131 and the housing 500 during the connection process, reducing the difficulty of connecting the second connecting portion 131 and the housing 500, and improving connection efficiency.

[0142] Optionally, as shown in Figures 6 and 7, a plurality of first limiting portions 132 are present in the circumferential direction of the second connection portion 131, with the plurality of first limiting portions 132 and the plurality of avoidance ports 1312 being provided alternately. In this way, a reduction in the structural strength of the second connection portion 131 due to the provision of a plurality of first stopping portions 132 and a plurality of avoidance ports 1312 is prevented. In other words, it is guaranteed that the second connection portion 131 has a specific structural strength, extending the service life of the second connection portion 131 and further facilitating the realization of a fixed connection between the second connection portion 131 and the housing 500, that is, improving the positional stability of the current collector 100 by realizing a fixed connection between the current collector 100 and the housing 500.

[0143] In some cases, as shown in Figure 6, the bypass port 1312 is aligned with the reinforcing portion 1311, thereby preventing a reduction in structural strength due to the provision of the bypass port 1312 in the second connection portion 131, and ensuring the structural strength of the second connection portion 131.

[0144] Optionally, the first limiting portion 132 is a limiting port that penetrates the second connecting portion 131 in the thickness direction of the second connecting portion 131. Here, the first limiting portion 132 is a limiting port that penetrates the second connecting portion 131 in the thickness direction of the second connecting portion 131, facilitating the realization of cooperative limiting between the second connecting portion 131 and the housing 500 using the limiting port.

[0145] Optionally, the second limiting portion 310 is a limiting projection provided on the housing 500 and extending toward the current collector 100, ensuring that the limiting projection can perform cooperative limiting within the limiting port, thereby achieving cooperative limiting between the second connecting portion 131 and the housing 500 through cooperation between the first limiting portion 132 and the second limiting portion 310.

[0146] Optionally, as shown in Figure 6, the second connection portion 131 forms an annular structure, the orthographic projection of the limiting port on the first plane forms a rectangle, the circumference of the limiting port is G2, 0.5 mm ≤ G2 ≤ ​​πR1 / n1, where R1 is the radius of the current collector 100, n1 is the number of limiting ports, and π is the ratio of the circumference of the circle to its diameter, π ≈ 3.14. The circumferential length of the limiting port as described herein may also be understood as the length of the extension of the limiting port in the circumferential direction of the second connection portion 131, thereby ensuring that the limiting port has a specific extension length for coordinating with the limiting projection and further preventing an excessive reduction in the area of ​​the second connection portion 131 due to the installation of the limiting port. In other words, the second connection portion 131 has a specific connection area with the housing 500, facilitating the realization of a fixed connection between the current collector 100 and the housing 500.

[0147] Note that Figure 6 shows the case where the orthographic projection of the limiting port on the first plane forms a rectangle. In some other examples, the orthographic projection of the limiting port on the first plane forms a square, triangle, sector, etc.

[0148] Optionally, as shown in FIG. 6, the radial width W3 of the limiting port satisfies the following condition, that is, 0.5 mm ≤ W3 < W1, and the radial width of the second connection portion 131 is W1. In other words, the first limiting portion 132 has a specific width in the radial direction of the current collector 100 forming a circle, which facilitates the formation of the first limiting portion 132 and facilitates the realization of the positioning cooperation between the second connection portion 131 and the housing 500 using the first limiting portion 132. In addition, since the radial width of the first limiting portion 132 is set smaller than the radial width of the second connection portion 131, thereby preventing the reduction of the structural strength and connection area of the second connection portion 131 by providing the first limiting portion 132, it is ensured that the second connection portion 131 has a specific structural strength, extends the service life, and can ensure that the second connection portion 131 has a specific connection area with the housing 500.

[0149] Optionally, as shown in FIG. 7, there are a plurality of first limiting portions 132, and the plurality of first limiting portions 132 are provided in one-to-one alignment with the plurality of first connection portions 121 in the radial direction of the second connection portion 131. By providing the plurality of first limiting portions 132, the positioning cooperation between the second connection portion 131 and the housing 500 can be efficiently performed. Since the plurality of first limiting portions 132 are provided in one-to-one alignment with the plurality of first connection portions 121, the first limiting portion 132 is provided away from the connection piece 140, so that the first limiting portion 132 does not affect the fixed connection between the second connection portion 131 and the intermediate portion 122. In other words, it is guaranteed that the positioning cooperation between the second connection portion 131 and the cover plate 300 can be efficiently realized using the first limiting portion 132, and it is further guaranteed that the fixed connection between the second connection portion 131 and the intermediate portion 122 can be efficiently executed, thereby guaranteeing the position stability and structural strength of the current collector 100.

[0150] In some embodiments of this application, as shown in Figures 1 and 2, the intermediate portion 122 is provided with a liquid injection port 1221 that penetrates the intermediate portion 122 in the thickness direction of the intermediate portion 122. Here, the intermediate portion 122 is provided with a liquid injection port 1221 that penetrates the intermediate portion 122 in the thickness direction of the intermediate portion 122, thereby facilitating liquid injection into the jelly roll 200 via the liquid injection port 1221 by enabling communication between both sides of the intermediate portion 122 in the thickness direction.

[0151] 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.

[0152] In addition, since the liquid injection port 1221 is provided in the intermediate section 122, it is possible to place the liquid injection port 1221 near the intermediate section of the jelly roll 200, thereby facilitating the injection of liquid into the jelly roll 200 from the liquid injection port 1221.

[0153] Optionally, as shown in Figure 1, the liquid injection port 1221 includes a through port 1222 and a positioning port 1223 that communicate 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 tooling equipment to prevent rotation of the current collector 100 during the installation process. The above configuration ensures that the liquid injection port 1221 facilitates the injection of liquid into the jelly roll 200 and also facilitates the positioning of the connection between the current collector 100 and the jelly roll 200, thereby reducing the difficulty of connecting the current collector 100 and the jelly roll 200 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.

[0154] In addition, the positioning port 1223 can further prevent the current collector 100 from rotating relative to the jelly roll 200, thereby improving the positional stability of the current collector 100.

[0155] 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 positioning port 1223 is formed as a rectangular port and is used in conjunction with tooling equipment to prevent the current collector 100 from rotating during the installation process and to reduce the difficulty of installing the current collector 100.

[0156] Hereinafter, the battery cell 1000 in the embodiments of this application will be described with reference to the accompanying drawings of this specification.

[0157] As shown in Figure 8, the battery cell 1000 according to the embodiment of this application includes a housing 500, a jelly roll 200, and a current collector 100.

[0158] A housing cavity is formed in the housing 500. The jelly roll 200 is placed inside the housing cavity. In other words, the jelly roll 200 is adapted to be placed inside the housing 500, and by protecting the jelly roll 200 by using the housing 500, the service life of the jelly roll 200 is extended and the safety of use of the jelly roll 200 is improved.

[0159] The current collector 100 is the current collector 100 described above. The current collector 100 is positioned between the jelly roll 200 and the housing 500. The first connection portion 121 is electrically connected to the jelly roll 200, and the second connection portion 131 is electrically connected to the housing 500.

[0160] As can be seen from the structure described above, the battery cell 1000 in the embodiment of this application uses the aforementioned current collector 100. As a result, the first connection portion 121 can be set to be electrically connected to the jelly roll 200, and the second connection portion 131 can be set to be electrically connected to the housing 500 on the premise that the current collector 100 does not need to be bent, thereby reducing the bending process and improving connection efficiency. In addition, the current collector 100 has a sufficient connection area with the jelly roll 200, enabling a fixed connection between the current collector 100 and the jelly roll 200, increasing the overcurrent area of ​​the current collector 100, preventing overcurrent deficiency of the jelly roll 200 caused by a small overcurrent area of ​​the current collector 100, and further ensuring that the serious overheating problem of the jelly roll 200 is avoided. In this way, the service life of the jelly roll 200 is extended, the safety of use of the jelly roll 200 is improved, the service life of the battery cell 1000 is extended, and the safety of use of the battery cell 1000 is improved.

[0161] The second connection portion 131 is configured to connect to the housing 500, thereby establishing an electrical connection between the current collector 100 and the housing 500, and further establishing an electrical connection between the jelly roll 200 and the housing 500, allowing the battery cell 1000 to operate normally.

[0162] In addition, by using the aforementioned current collector 100, the structural stability of the battery cell 1000 can be further improved, the capacity of the battery cell 1000 can be further increased, and the quality of the battery cell 1000 can be further improved.

[0163] In other words, because the battery cell 1000 of this application uses the aforementioned current collector 100, the battery cell 1000 has advantages such as large capacity, stable structure, long service life, and high safety of use.

[0164] Optionally, as shown in Figure 8, the housing 500 includes a casing 400 and a cover plate 300. The casing 400 has a housing cavity with an opening. The jelly roll 200 is placed inside the housing cavity, the cover plate 300 is placed inside the opening, and the current collector 100 is placed between the jelly roll 200 and the cover plate 300. A first connection portion 121 is electrically connected to the jelly roll 200, and a second connection portion 131 is electrically connected to the cover plate 300, thereby providing an electrical connection between the jelly roll 200 and the cover plate 300. In other words, in this example, the second connection portion 131 is primarily electrically connected to the cover plate 300.

[0165] It should be noted that a housing cavity with an opening is formed within the casing 400, and the opening is adapted to allow communication between the inside and outside of the housing cavity, ensuring that external components (e.g., the current collector 100 and the jelly roll 200) can be placed inside the housing cavity. By placing the cover plate 300 in the opening, the opening can be sealed using the cover plate 300, preventing foreign matter and dust from entering the housing cavity through the opening, thereby improving the safety of use of the jelly roll 200, i.e., the safety of use of the battery cell 1000.

[0166] In some other examples, the housing 500 includes a casing 400 and a cover plate 300. The casing 400 has a housing cavity with an opening. The jelly roll 200 is placed inside the housing cavity, the cover plate 300 is placed in the opening, and the current collector 100 is placed between the jelly roll 200 and the casing 400. A first connection portion 121 is electrically connected to the jelly roll 200, and a second connection portion 131 is electrically connected to the casing 400, thereby providing an electrical connection between the jelly roll 200 and the casing 400. In other words, in this example, the second connection portion 131 is primarily electrically connected to the casing 400 (not illustrated in this example).

[0167] Optionally, since the battery cell 1000 is a cylindrical battery, the internal structure of the battery cell 1000 (jelly roll 200 and housing 500) can be adapted to a circular current collector.

[0168] In some examples, the orthographic area of ​​the first connection portion 121 on 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 smaller than the orthographic area of ​​the first connection portion 121 on the first plane, but it is still necessary to ensure that the first connection portion 121 has a sufficient connection area with the jelly roll 200 in order to ensure the overcurrent capability of the current collector 100. 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 solder marks. The clear boundary between the first connection portion 121 and the intermediate portion 122 may be a straight line connecting the opposing side walls at the connection point between the first connection portion 121 and the intermediate portion 122.

[0169] In addition, by making the minimum connection area between the first connection portion 121 and the jelly roll 200 smaller than the orthogonal projection area of ​​the first connection portion 121 onto the first plane, the difficulty of connecting the current collector 100 and the jelly roll 200 can be reduced, and the assembly efficiency of the battery cell 1000 can be improved.

[0170] It should be noted that in some examples, a minimum connection area may be provided on the first connection portion 121 to ensure that the operator can efficiently 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, it is determined that the minimum connection area between the first connection portion 121 and the jelly roll 200 meets the requirements.

[0171] Optionally, multiple positioning portions, such as positioning grooves or positioning protrusions, are provided on the first connection portion 121, and the region surrounded by the multiple positioning portions forms the minimum connection region.

[0172] 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 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 are determined by the following conditions, namely: The condition nNKS≧C must be satisfied.

[0173] n represents the number of first connection parts 121, N is the compensation coefficient, which ranges from 0.7 to 1, and K is the overcurrent coefficient of the first connection part 121.

[0174] K may be determined directly based on the material of the first connecting portion 121, Ah / mm 2Please note that the unit is . The minimum overcurrent requirement C of the jelly roll 200 may be determined based on the charging time required by the jelly roll 200. Specifically, in the actual manufacturing process of the battery cell 1000, the rapid charging time that the battery cell 1000 to be manufactured 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 then 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, it is ensured that the overcurrent capacity of the current collector 100 can meet the minimum overcurrent requirements of the jelly roll 200, preventing overcurrent deficiency of the jelly roll 200 and avoiding serious overheating problems, thereby extending the service life of the jelly roll 200 and improving the safety of use of the jelly roll 200.

[0175] In some specific cases, the minimum overcurrent requirement C for the Jelly Roll 200 is in the range of 15Ah to 120Ah.

[0176] Optionally, the connection width H between the first connection portion 121 and the intermediate portion 122 and the minimum overcurrent requirement C of the jelly roll 200 also need to meet certain conditions in order to further guarantee the overcurrent capability of the current collector 100.

[0177] Specifically, the connection width H between the first connection portion 121 and the intermediate portion 122 and the minimum overcurrent requirement C for the jelly roll 200 are given by the following conditions, namely: The condition nKHδ = C is satisfied.

[0178] n represents the number of first connection parts 121, δ represents the thickness of the first connection parts 121, K is the overcurrent coefficient of the current collector 100, K can be directly determined based on the material of the current collector 100, and is in units of Ah / mm2.

[0179] In other words, in the actual manufacturing process of the battery cell 1000, 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 meet specific conditions, and the connection width H between the first connection portion 121 and the intermediate portion 122 and the minimum overcurrent requirement C of the jelly roll 200 must also meet specific conditions, thereby ensuring that the overcurrent capability of the current collector 100 is efficiently secured.

[0180] In the specific method for determining the connection width H between the first connection portion 121 and the intermediate portion 122, the charging time of the battery cell 1000 can be directly determined during the actual manufacturing process of the battery cell 1000. 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 intermediate portion 122 is calculated based on the minimum overcurrent requirement C, the number of first connection portions 121, and the thickness of the first connection portions 121, thereby ensuring that the connection width H between the first connection portion 121 and the intermediate portion 122 and the minimum overcurrent requirement C of the jelly roll 200 satisfy specific conditions.

[0181] The following describes the battery pack 2000 according to the embodiment of this application.

[0182] 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.

[0183] From the structure described above, it can be seen that the battery pack 2000 according to the embodiment of this application uses the aforementioned battery cell 1000 to reduce the difficulty of manufacturing the battery pack 2000, guarantee the operational performance of the battery pack 2000, further improve the structural stability of the battery pack 2000, extend the service life of the battery pack 2000, and improve the safety of use of the battery pack 2000.

[0184] The following describes a power consumption device 3000 according to an embodiment of this application.

[0185] 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.

[0186] From the structure described above, it can be seen that the power consumption device 3000 according to the embodiment of this application, by using the aforementioned battery pack 2000, that is, by using the aforementioned battery cell 1000, guarantees the operational performance of the power consumption device 3000, improves the safety of use of the power consumption device 3000, extends the service life of the power consumption device 3000, and reduces the cost of use.

[0187] It should be noted that the power consumption device 3000 in this specification may be a vehicle, energy storage cabinet, ship, aircraft, etc.

[0188] It should be noted that, in the description of this application, the terms “attachment” and “connection” should be understood broadly unless otherwise expressly specified and limited. For example, these terms may refer to a fixed connection, a removable connection, or an integral connection, or a mechanical connection or an electrical connection. Those skilled in the art will be able to understand the specific meaning of these terms in this application based on the particular context.

[0189] Note that in Figures 2 and 3, six first connecting portions 121 are shown 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 having a different number of first connecting portions 121 is also within the scope of this application.

[0190] Other components of the current collector 100, battery cell 1000, battery pack 2000, and power consumption device 3000 according to embodiments of this application are known to those skilled in the art and will not be described in detail again herein.

[0191] In this specification, descriptions relating to terms such as “embodiments” and “examples” mean that the specific features, structures, or properties described in relation to the embodiments or examples are included in at least one embodiment or example of this application. In this specification, exemplary expressions of these terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or properties described may be combined in any suitable manner in any one or more embodiments or examples.

[0192] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and objectives of this application, and that the scope of this application is defined by the claims and their equivalents.

Claims

1. A current collector (100), wherein the orthographic projection of the outer peripheral wall of the current collector (100) on a first plane lies on a first circle, and the first plane is perpendicular to the thickness direction of the current collector (100), A first connection region (120) comprising an intermediate portion (122) and a plurality of first connection portions (121), wherein the plurality of first connection portions (121) are sequentially arranged in the circumferential direction of the intermediate portion (122), the plurality of first connection portions (121) are separately connected to the intermediate portion (122), and each first connection portion (121) is electrically connected to the jelly roll (200), and A second connecting portion (131) extends circumferentially from the intermediate portion (122) and is located on one side of the first connecting region (120), A connecting piece (140) is connected between the second connecting portion (131) and the intermediate portion (122), and the inner circumferential wall of the first connecting portion (121) and the second connecting portion (131) are separated to form a spacing gap (150), and the radial dimension G of the orthographic projection of the spacing gap (150) on the first plane １ A current collector (100) comprising a connecting piece (140) whose value is in the range of 0.5 mm to 2 mm, and the second connecting portion (131) is electrically connected to the housing (500).

2. The current collector (100) according to claim 1, wherein the first connecting portion (121) and the connecting piece (140) are spaced apart in the circumferential direction of the current collector (100).

3. The current collector (100) according to claim 1 or 2, wherein the connecting piece (140) extends diagonally toward the second connecting portion (131) relative to the intermediate portion (122), thereby creating a height difference between the first connecting region (120) and the second connecting portion (131).

4. The radius R of the current collector (100) １ A current collector (100) according to any one of claims 1 to 3, wherein the value of is 10 mm or more and 100 mm or less.

5. The orthogonal projection images of the outer periphery walls of the plurality of first connecting portions (121) on the first plane are all located on the second circle, and the radius R of the second circle ２ and the radius R of the current collector (100) １ is 1 / 2R １ ≤R ２ <R １ A current collector (100) according to any one of claims 1 to 4, which satisfies the conditions.

6. The current collector (100) according to any one of claims 1 to 5, wherein the second connecting portion (131) forms an annular structure, and the inner circumferential wall of the second connecting portion (131) is connected to the intermediate portion (122) using the connecting piece (140).

7. The radial width of the second connection portion (131) is W １ where 1 mm ≤ W １ ≤ 1 / 2R １ where R １ represents the radius of the current collector (100). The current collector (100) according to claim 6

8. There are multiple connecting pieces (140), and the multiple connecting pieces (140) are spaced at equal intervals. The current collector (100) according to claim 6 or 7, wherein the plurality of first connecting portions (121) and the plurality of connecting pieces (140) are alternately distributed in the circumferential direction of the current collector (100).

9. The current collector (100) according to any one of claims 1 to 8, wherein 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 housing (500), and the first surface and the second surface are parallel to each other.

10. The current collector (100) according to any one of claims 1 to 9, wherein 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 adapted to be located radially outward of the tab of the jelly roll (200).

11. The current collector (100) according to claim 10, wherein the stopping projection (1313) is defined by bending and deformation of a part of the second connecting portion (131).

12. A current collector (100) according to any one of claims 1 to 11, wherein a first limiting portion (132) is provided on the second connecting portion (131), and the first limiting portion (132) is adapted to limit cooperation with the second limiting portion (310) on the housing (500).

13. The current collector (100) according to claim 12, wherein the first limiting portion (132) is a limiting port that penetrates the second connecting portion (131) in the thickness direction of the second connecting portion (131).

14. The second connecting portion (131) forms an annular structure, the orthogonal projection of the limiting port onto the first plane forms a rectangle, and the perimeter of the limiting port is G ２ Therefore, 0.5 mm ≤ G ２ ≤πR １ / n １ And R １ n indicates the radius of the current collector (100), １ This indicates the number of restricted ports, and / or The radial width W of the aforementioned limiting port ３ However, 0.5 mm ≤ W ３ <W １ The following conditions are met, and the radial width of the second connecting portion (131) is W １ The current collector (100) according to claim 13.

15. The current collector (100) according to any one of claims 1 to 14, wherein the intermediate portion (122) is provided with a liquid injection port (1221) that penetrates the intermediate portion (122) in the thickness direction of the intermediate portion (122).

16. A battery cell (1000), A housing (500) wherein a housing cavity is formed within the housing (500), A jelly roll (200), wherein the jelly roll (200) is disposed within the housing cavity, A battery cell (1000) comprising a current collector (100), wherein the current collector (100) is a current collector (100) according to any one of claims 1 to 15, the current collector (100) is positioned between the jelly roll (200) and the housing (500), the first connection portion (121) is electrically connected to the jelly roll (200), and the second connection portion (131) is connected to the housing (500).

17. A battery pack (2000) comprising a plurality of battery cells (1000) as described in claim 16.

18. A power consumption device (3000) comprising the battery pack (2000) described in claim 17.

Images