Battery cells, battery packs, and power consumption devices

Abstract

A battery cell, a battery pack, and a power consumption device are provided. The battery cell includes a housing, an electrode core, a first current collector plate, and a conductive pillar. A first tab is located at the end of the electrode core in a first direction. The electrode core is located within the housing. The first current collector plate and the conductive pillar are located at the end of the first tab, away from the electrode core. The first current collector plate is constructed in a flat shape. The first current collector plate is electrically connected to the conductive pillar and the first tab.

Description

Technical Field

[0001] Cross - reference to Related Applications This application claims priority to Chinese Patent Application No. 202310398938.2, entitled "BATTERY CELL, BATTERY PACK, AND POWER CONSUMING DEVICE", filed on April 14, 2023, which is incorporated herein by reference in its entirety.

[0002] This application relates to the field of batteries, and more particularly, to battery cells, battery packs, and power - consuming devices.

Background Art

[0003] In related technologies, in order to draw current from the positive or negative electrode, in a cylindrical battery, a current - collecting plate is usually disposed between the electrode core and the terminal or between the electrode core and the bottom cover. The current - collecting plate is folded and connected between the electrode core and the terminal or between the electrode core and the bottom cover through the structure of the current - collecting plate, and as a result, the current of the electrode core is drawn from the positive or negative electrode.

[0004] However, the folded current - collecting plate occupies a large space, and the size of the electrode core is easily compressed, resulting in a reduction in the capacity of the cylindrical battery during actual manufacturing.

Summary of the Invention

[0005] This application is intended to solve at least one of the technical problems in the related art. Therefore, the object of this application is to provide a battery cell. The battery cell can reduce the space occupied by the current - collecting plate and improve the capacity of the battery cell.

[0006] This application further provides a battery pack having the aforementioned battery cell.

[0007] This application further provides a power - consuming device having the aforementioned battery pack.

[0008] The battery cell according to this application includes a housing, an electrode core having a first tab positioned at the end of the electrode core in a first direction and the electrode core being positioned within the housing, and a first current collector plate and a conductive pillar. The first current collector plate and conductive pillar are positioned at the end of the first tab and away from the electrode core. The first current collector plate is constructed in a flat shape. The first current collector plate is electrically connected to the conductive pillar and the first tab.

[0009] According to a battery cell in one embodiment of this application, the first current collector plate is configured in a flat plate shape and is electrically connected to a conductive pillar and a first tab, so that the current in the electrode core can be drawn from either the positive or negative electrode. The flat plate shape has smaller dimensions than existing folding structures in a first direction. If the battery cell has the same external size, the dimensions of the electrode core in the first direction can be set to be larger, so that the capacity of the battery cell can be increased.

[0010] The battery pack according to this application includes the aforementioned battery cells.

[0011] The battery pack according to this application is arranged with the battery cells described in the above-described embodiment. Because the battery pack according to this application is arranged with the battery cells described in the above-described embodiment, the capacity of the battery pack is increased.

[0012] The power consumption device according to this application includes the aforementioned battery pack.

[0013] The power consumption device according to this application is equipped with the battery pack or battery cells described in the above-described embodiment. Because the power consumption device according to this application is equipped with the battery pack or battery cells described in the above-described embodiment, the durability of the power consumption device is extended.

[0014] Some further aspects and advantages of this application are provided in the following description, and some further aspects and advantages will become apparent from the following description or will be learned from the practice of this application.

[0015] The aforementioned further aspects and advantages of the present application will be apparent and readily understood from the description of the embodiments in conjunction with the following drawings.

Brief Description of the Drawings

[0016] [Figure 1] It is a schematic diagram of a battery cell according to an embodiment of the present application. [Figure 2] It is a schematic diagram of the attachment of a cover plate assembly according to an embodiment of the present application. [Figure 3] It is a cross-sectional view of a cover plate assembly according to an embodiment of the present application. [Figure 4] It is a schematic diagram of a cover plate assembly according to an embodiment of the present application. [Figure 5] It is a schematic diagram of a separator according to an embodiment of the present application. [Figure 6] It is a cross-sectional view of a separator according to an embodiment of the present application. [Figure 7] It is a schematic diagram of a separator according to another embodiment of the present application. [Figure 8] It is a schematic diagram of a first current collector plate according to an embodiment of the present application. [Figure 9] It is a schematic diagram of a first current collector plate according to an embodiment of the present application. [Figure 10] It is a schematic diagram of a first current collector plate according to another embodiment of the present application. [Figure 11] It is an exploded view according to an embodiment of the present application. [Figure 12] It is a schematic diagram of the attachment of a cover plate assembly according to an embodiment of the present application. [Figure 13] It is a schematic diagram of the assembly of a heat-shrinkable insulating film according to an embodiment of the present application. [Figure 14] It is a partially enlarged view according to an embodiment of the present application. [Figure 15] It is a partially enlarged view according to an embodiment of the present application. [Figure 16] It is a schematic diagram of a heat-shrinkable insulating film according to an embodiment of the present application. [Figure 17] It is a schematic structural diagram of a second current collector plate in one direction according to an embodiment of the present application. [Figure 18] It is a schematic structural diagram of a second current collector plate in another direction according to an embodiment of the present application. [Figure 19] It is a schematic structural diagram of a second current collector plate in another direction according to an embodiment of the present application. [Figure 20] It is a partially enlarged view of FIG. 19. [Figure 21] It is a schematic diagram comparing before and after the movement of a second connection part according to an embodiment of the present application. [Figure 22] It is a partial cross-sectional view of a battery cell according to an embodiment of the present application. [Figure 23] It is a schematic structural diagram of a second current collector plate according to another embodiment of the present application. [Figure 24] It is a schematic diagram of the attachment of a second current collector plate and a bottom cover according to another embodiment of the present application. [Figure 25] It is a schematic structural diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 26] It is a schematic structural diagram of a second current collector plate in another direction according to another embodiment of the present application. [Figure 27] It is a schematic structural diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 28] It is a partial cross-sectional view of a battery cell according to an embodiment of the present application. [Figure 29] It is a partially enlarged view of FIG. 28. [Figure 30] It is a schematic structural diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 31] It is a schematic structural diagram of a second current collector plate in another direction according to another embodiment of the present application. [Figure 32] It is a cross-sectional view of FIG. 31. [Figure 33] It is a partially enlarged view of FIG. 32. [Figure 34] It is a schematic structural diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 35] This is a schematic diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 36] This is a schematic diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 37] This is a schematic diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 38] This is a schematic diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 39] This is a schematic diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 40] This is a schematic diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 41] This is a schematic diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 42] This is a schematic diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 43] This is a schematic diagram of a second current collector plate in one direction according to another embodiment of the present application. [Figure 44] This is a schematic diagram of the bottom cover in one direction according to one embodiment of the present application. [Figure 45] This is a schematic diagram of the bottom cover in a different orientation according to one embodiment of the present application. [Figure 46] This is a schematic diagram of the bottom cover in a different orientation according to one embodiment of the present application. [Figure 47] This is a cross-sectional view of Figure 46. [Figure 48] This is a magnified view of a portion of Figure 47. [Figure 49] This is a magnified view of a portion of Figure 47. [Figure 50] This is a magnified view of a portion of Figure 47. [Figure 51] This is a schematic diagram of a battery pack according to one embodiment of the present application. [Figure 52] This is a schematic diagram of a power consumption device according to one embodiment of this application. [Figure 53] This is a schematic diagram of a power consumption device according to one embodiment of this application. [Modes for carrying out the invention]

[0017] The following describes embodiments of the present application in detail, with examples of embodiments shown in the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals 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 illustrative and intended to illustrate the present application, and should not be understood as limitations thereto.

[0018] The following describes a battery cell 1000 according to an embodiment of this application, with reference to the attached drawings.

[0019] As shown in Figures 1 to 4, the battery cell 1000 according to this embodiment of the present application includes a housing 600 and an electrode core 500. A first tab is located at the end of the electrode core 500 in a first direction. The electrode core 500 is located within the housing 600. The battery cell 1000 further includes a first current collector plate 200 and a conductive pillar 41. The first current collector plate 200 and the conductive pillar 41 are located at the end of the first tab and at the end away from the electrode core 500 in the first direction. The first current collector plate 200 is constructed in a flat plate shape. The first current collector plate 200 is electrically connected to the conductive pillar 41 and the first tab. Specifically, the first direction may be the height direction of the battery cell 1000 as shown in the figures, i.e., the height direction of the housing 600 and the electrode core 500. When the first current collector plate 200 is mounted inside the housing 600, the thickness direction of the first current collector plate 200 is the same as the height direction of the housing 600 and the electrode core 500. In other words, the first direction may be the thickness direction of the first current collector plate 200. A housing cavity may be provided inside the housing 600, and the electrode core 500 is placed inside the housing cavity. The first tab is located at the end of the electrode core 500 in the first direction. The first current collector plate 200 is constructed in a flat plate shape. The first current collector plate 200 is electrically connected to the conductive pillar 41 and the first tab to draw current from the positive or negative electrode to the electrode core 500.

[0020] In some embodiments, the first current collector plate 200 is constructed in a flat shape, and the flat shape may be a circular flat shape, a square flat shape, and so on. In other words, a person skilled in the art may select the shape of the current collector plate depending on the application environment of the current collector plate. This is not particularly limited in this application. It can be understood that the first current collector plate 200 is constructed in a flat shape, and the flat shape may be a complete plate shape or a plate shape to which other structures are added. For example, the first current collector plate 200 has holes punched out for injecting electrolyte or for connecting to a conductive pillar 41. In another example, the first current collector plate 200 further includes a flange, which wraps around the outer circumference of the electrode core 500 when attached to the electrode core 500 without occupying space in the first direction of the battery cell 1000.

[0021] The first current collector plate 200 is constructed in a flat shape and has smaller dimensions than existing folding structures in the first direction. If the battery cell 1000 has the same external size, the dimensions of the electrode core 500 in the first direction can be set to be larger, and as a result the capacity of the battery cell 1000 can be improved.

[0022] It should be noted that the first tab 501 in this specification may be a full tab structure that is knurled or flattened, or a multi-tab structure that is processed by laser ablation or die-cutting.

[0023] Optionally, the material of the first current collector plate 200 may be an aluminum alloy, pure copper, nickel-plated copper, etc., and as a result the first current collector plate 200 is conductive, and by using the first current collector plate 200, the electrode core 500 is electrically connected to the conductive pillar 41. In some embodiments, when the material of the first current collector plate 200 is an aluminum alloy, the first current collector plate 200 is mainly mated and connected to the positive electrode tab of the electrode core 500. When the material of the first current collector plate 200 is nickel, copper, or nickel-plated copper, the first current collector plate 200 is mainly mated and connected to the negative electrode tab of the electrode core 500. In other words, a person skilled in the art may select the material of the first current collector plate 200 based on the application environment of the current collector plate. This is not particularly limited in this application.

[0024] It should be noted that the first current collector plate 200 may be electrically connected to the conductive pillar 41 and the first tab by welding, joining, or other means.

[0025] In the description of this application, the features defined by “first” and “second” may include one or more such features, either explicitly or implicitly, and are used to distinguish and describe features rather than to indicate order or importance.

[0026] In some embodiments of this application, the first current collector plate 200 includes a plate body 210 and a plurality of connecting sheets 220. The conductive pillar 41 may be a conductive pillar 41. An intermediate section 2100 and connecting slots 211 are provided on the plate body 210. The connecting slots 211 penetrate the plate body 210 in the thickness direction of the plate body 210, forming a plurality of through slots on the plate body 210. The orthogonal projection of the outer peripheral wall of the plate body 210 onto a first projection plane lies on a first ring. The first projection plane is perpendicular to the thickness direction of the plate body 210. The connecting slots 211 are located radially outward of the intermediate section 2100 in the radial direction of the plate body 210, and the intermediate section 2100 is electrically connected to the conductive pillar 41 to realize an electrical connection between the first current collector plate 200 and the conductive pillar 41. The connecting sheet 220 is located within the connecting slot 211 and is electrically connected to the plate body 210 via the bridge edge 221. The connecting sheet 220 is electrically connected to the first tab. Current on the electrode core 500 may flow through the connecting sheet 220, and current on the connecting sheet 220 flows from the bridge edge 221 to the first current collector plate 200.

[0027] In some embodiments, the orthographic projection of the bridge edge 221 onto the first projection plane lies radially inward of the outer edge of the radial orthographic projection of the connecting sheet 220 onto the plate body 210. As a result, current on the connecting sheet 220 can flow to the first current collector plate 200 via the bridge edge located radially inward of the connecting sheet 220, and current on the connecting sheet 220 can flow through the bridge edge 221 into a region closer to the inside of the plate body 210. This helps to shorten the current flow path on the plate body 210, reduce current loss on the plate body 210, and improve the current flow capability of the first current collector plate 200.

[0028] Specifically, the current in the electrode core 500 flows to the connecting sheet 220 and then from the bridge edge 221 to the first current collector plate 200. The current that reaches the plate body 210 is collected in the intermediate section 2100 and flows to the conductive pillar 41. As a result, the battery cell 1000 is electrically connected to the external element via the conductive pillar 41, enabling charging and discharging of the battery cell 1000.

[0029] If the orthographic projection of the bridge edge 221 onto the first projection plane is located radially outside the orthographic projection of the connecting sheet 220, the bridge edge 221 is located in a region close to the outside of the plate body 210, and the distance between the bridge edge 221 and the intermediate section 2100 is relatively long. If the current on the connecting sheet 220 flows to the intermediate section 2100 through the bridge edge 221, the current flow path on the plate body 210 is relatively long, and a large amount of current energy is consumed on the plate body 210.

[0030] Therefore, the orthographic projection of the bridge edge 221 onto the first projection plane is positioned radially inward of the outer edge of the orthographic projection of the connecting sheet 220. As a result, when the connecting sheet 220 is connected to the plate body 210 by using the bridge edge 221, the bridge edge 221 is positioned close to the intermediate section 2100 of the plate body 210. In this way, when current on the connecting sheet 220 flows to the intermediate section 2100 via the bridge edge 221, the current flow path on the plate body 210 is relatively short. This helps to shorten the current flow path on the plate body 210, reduce losses in the process of current flow, and improve the current flow capability of the first current collector plate 200.

[0031] Therefore, the first current collector plate 200 according to this embodiment of the present application has advantages such as shortening the current flow path on the plate body 210, reducing losses in the process of current flow, and improving the current flow capability of the first current collector plate 200.

[0032] As shown in Figure 8, the plate body 210 is provided with a plurality of connection slots 211 and a plurality of connection sheets 220, and the plurality of connection slots 211 are provided spaced apart from each other on the radially outer side of the intermediate section 2100. The plate body 210 further has a separation section 214, which is positioned between two adjacent connection slots 211 to form a plurality of independent connection slots 211 on the plate body 210. The plurality of connection sheets 220 are arranged in a one-to-one correspondence with the plurality of connection slots 211, and as a result, the connection sheets 220 are positioned correspondingly within the connection slots 211.

[0033] In some embodiments, the isolation section 214 is connected to the bridge edge 221 and the intermediate section 2100, so that current on the connection sheet 220 can flow along the isolation section 214 through the bridge edge 221 to the intermediate section 2100, and current in the electrode core 500 can flow smoothly to the conductive pillar 41, thereby achieving an electrical connection between the battery cell 1000 and the external elements.

[0034] Specifically, the orthographic projection of the bridge edge 221 onto the first projection plane is positioned radially inward of the outer edge of the orthographic projection of the connecting sheet 220. This helps to shorten the length of the separation portion 214, shorten the current flow path on the plate body 210, reduce losses in the process of current flow, and improve the current flow capability of the first current collector plate 200.

[0035] In some embodiments of this application, as shown in Figures 8 and 9, the outer peripheral sidewall of the connecting slot 211 is spaced radially away from the outer peripheral wall of the plate body 210 in order to space the connecting sheet 220 in the connecting slot 211 away from the outer peripheral wall of the plate body 210. In this case, the outer peripheral sidewall of the connecting sheet 220 is located within the connecting slot 211 and spaced away from the outer peripheral wall of the plate body 210.

[0036] In some other embodiments of this application, as shown in Figure 10, the outer periphery wall of the plate body 210 is provided with openings 215 extending to the outer periphery wall of the plate body 210 so as to define a plurality of connection slots 211, and as a result the connection slots 211 communicate with the openings 215, and the connection sheets 220 within the connection slots 211 communicate with the outside of the plate body 210 through the openings 215.

[0037] In some embodiments, the connection slot 211 is spaced apart from the outer periphery wall of the plate body 210, or the connection slot 211 communicates with the opening 215, and as a result, the configuration for arranging the connection sheet 220 within the connection slot 211 can be selected, thereby allowing for the selection of an appropriate method for arranging the connection sheet 220 on the plate body 210 based on various requirements regarding the electrical connection between the connection sheet 220 and the plate body 210, and as a result, the connection sheet 220 is spaced apart from the outer periphery wall of the plate body 210, or the connection sheet 220 communicates with the outside of the plate body 210 through the opening 215.

[0038] In some optional embodiments of this application, the connection slot 211 is provided with a plurality of side walls, as shown in Figure 9. Of the plurality of side walls, the side walls positioned in the radial direction of the plate body 210 opposite the outer peripheral wall of the plate body 210 are defined as outer edge side walls 2113. Each connection sheet 220 is electrically connected to the plate body 210 via a bridge edge 221 to realize an electrical connection between the connection sheet 220 and the plate body 210. In this way, when the connection sheet 220 is electrically connected to the electrode core 500, current on the electrode core 500 can flow to the connection sheet 220, and the current on the connection sheet 220 flows through the bridge edge 221 to the intermediate section 2100, and from the intermediate section 2100 to the conductive pillar 41, thereby realizing an electrical connection between the electrode core 500 and the external element by using the conductive pillar 41.

[0039] Each bridge edge 221 is connected to one of the side walls of the plurality of side walls, excluding the outer edge side wall 2113, and as a result, the bridge edges 221 are positioned close to the intermediate section 2100. This helps to shorten the current flow path on the connecting sheet 220, the bridge edges 221, and the plate body 210, reduce current loss, and improve the current flow capacity on the first current collector plate 200.

[0040] After the current on the electrode core 500 flows through the multiple connection sheets 220, the current must first flow to the plate body 210 via the bridge edges 221 corresponding to the multiple connection sheets 220, and then to the intermediate section 2100 of the plate body 210. As a result, the current flows concentratedly from the intermediate section 2100 of the plate body 210 to the conductive pillar 41.

[0041] Compared to the case where the bridge edge 221 is located on the outer edge sidewall 2113, locating the bridge edge 221 on a sidewall other than the outer edge sidewall 2113 in the connection slot 211 helps to shorten the distance between the bridge edge 221 and the intermediate section 2100, and further helps to shorten the current flow path on the connection sheet 220, the bridge edge 221, and the plate body 210, and in particular helps to shorten the current flow path on the plate body 210. Since the plate body 210 has resistance, shortening the current flow path on the plate body 210 helps to reduce the losses caused when current flows through the plate body 210. Therefore, locating the bridge edge 221 on a sidewall other than the outer edge sidewall 2113 in the connection slot 211 helps to reduce current losses and improve the current flow capability of the first current collector plate 200.

[0042] Specifically, when the bridge edge 221 is positioned on the outer edge sidewall 2113, the current on the connecting sheet 220 must first flow through the bridge edge 221 to the outer region of the plate body 210, and then flow along the plate body 210 to the intermediate section 2100 of the plate body 210. When the bridge edge 221 is positioned on a sidewall other than the outer edge sidewall 2113 in the connecting slot 211, the current on the connecting sheet 220 may flow directly along the bridge edge 221 to the region closer to the center of the plate body 210, and then flow along the plate body 210 to the intermediate section 2100, and from the intermediate section 2100 to the conductive pillar 41.

[0043] In some optional embodiments of this application, as shown in Figures 8 and 9, the plurality of side walls of the connection slot 211 include a first connection side wall 2111 and a second connection side wall 2112. In the circumferential direction of the plate body 210, both ends of the outer edge side wall 2113 are connected to the first connection side wall 2111 and the second connection side wall 2112, respectively, to form a complete connection slot 211, and as a result the connection sheet 220 is positioned within the connection slot 211. The connection sheet 220 and the bridge edge 221 are used to achieve an electrical connection between the plate body 210 and the electrode core 500, so that current from the electrode core 500 can flow into the plate body 210.

[0044] In some embodiments, at least one of the first connecting sidewall 2111 and the second connecting sidewall 2112 is connected to the bridge edge 221, so that the connecting sheet 220 is positioned within the connecting slot 211. In this way, current on the connecting sheet 220 can flow to the plate body 210 via the bridge edge 221, and current on the plate body 210 flows along the plate body 210 from the intermediate section 2100 to the conductive pillar 41. In addition, it is convenient to design and adjust the length of the bridge edge 221 so that its length directly reflects requirements such as current flow capability. Furthermore, the connecting sheet 220 can cover more tabs 311, in particular the tabs 311 on the outer circle of the electrode core 500.

[0045] In some optional embodiments of this application, as shown in Figure 9, a plurality of connection slots 211 are provided in the plate body 210, and a connection sheet 220 is placed in each connection slot 211. In the circumferential direction of the plate body 210, each of the plurality of connection sheets 220 is connected to a corresponding first connection side wall 2111 via a bridge edge 221, and as a result, current on the connection sheet 220 can flow from the corresponding first connection side wall 2111 through the bridge edge 221 to a region close to the intermediate section 2100, and current on the connection sheet 220 can flow smoothly to the intermediate section 2100 of the plate body 210, and from the intermediate section 2100 of the plate body 210 to the conductive pillar 41.

[0046] As shown in Figure 8, in this embodiment, the multiple connection slots 211 are spaced apart from each other in the circumferential direction of the plate body 210. In the circumferential direction of the plate body 210, a second connection side wall 2112 is positioned between two adjacent first connection side walls 2111, and as a result, the connection sheet 220 is connected to the first connection side walls 2111 via bridge edges 221, and the multiple bridge edges 221 are spaced apart. In this way, the current on each connection sheet 220 flows along the corresponding bridge edge 221 to the intermediate section 2100 of the plate body 210 via a designated path, achieving a uniform current flow on the plate body 210. This avoids the concentration of current on adjacent connection sheets 220 in a certain area of ​​the plate body 210, avoids excessive temperature increases in some areas of the plate body 210 due to the uneven distribution of current on the connection sheets 220, and avoids affecting the heat dissipation of the plate body 210.

[0047] In some embodiments of this application, the shape of the connection slot 211 is triangular or sector-shaped, as shown in Figures 8 and 9. Such a configuration helps to increase the area of ​​the connection slot 211, and further helps to increase the area of ​​the connection sheet 220 within the connection slot 211, thereby helping to realize an electrical connection between the connection sheet 220 and the electrode core 500, and as a result, current on the electrode core 500 can flow smoothly to the plate body 210 through the connection sheet 220 and the bridge edge 221.

[0048] As shown in Figures 8 and 9, in this embodiment, the plate body 210 is formed in the shape of a circular disc, and the connection slots 211 are formed in the shape of a triangle or a sector, so that the space on the plate body 210 can be fully utilized and multiple spaced connection slots 211 are formed on the plate body 210. This helps to increase the area of ​​the connection slots 211.

[0049] In some embodiments, the shape of the connection sheet 220 conforms to the shape of the connection slot 211. In other words, increasing the area of ​​the connection slot 211 helps to design the area of ​​the connection sheet 220 to be relatively large, thereby helping to achieve an electrical connection between the connection sheet 220 and the electrode core 500.

[0050] In some embodiments, the connecting sheet 220 is electrically connected to the electrode core 500 by welding, with the welding zone being the side of the connecting sheet 220 that is closer to the electrode core 500. Designing the connecting sheet 220 to have a relatively large area helps to achieve stable welding between the connecting sheet 220 and the electrode core 500, and stable electrical connection between the electrode core 500 and the connecting sheet 220, so that current on the electrode core 500 can flow smoothly to the plate body 210 through the connecting sheet 220 and the bridge edge 221. This avoids the connecting sheet 220 becoming disengaged from the electrode core 500 when the first current collector plate 200 or the electrode core 500 is moved.

[0051] In some embodiments of this application, the length of the bridge edge 221 in the radial direction of the plate body 210 is 0.5 mm to 30 mm. Specifically, the length of the bridge edge 221 may be selected based on the current-carrying capacity of the connecting sheet 220 and the plate body 210, the current flow rate, the specific size of the connecting slot 211 and the connecting sheet 220, etc. Optionally, the length M of the bridge edge 221 is 1 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, or 30 mm.

[0052] In addition, in one embodiment in which the first current collector plate 200 is used in the battery cell 1000, the length of the bridge edge 221 is selected to meet different rapid charging requirements for the battery cell 1000.

[0053] In some embodiments, the length of the bridge edge 221 is 1 mm to 14 mm, and the length of the bridge edge 221 may be selected based on the current-carrying capacity of the connecting sheet 220 and the board body 210, the current flow rate, the specific size of the connecting slot 211 and the connecting sheet 220, etc.

[0054] For example, the length M of the bridge edge 221 can be 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, or 14 mm.

[0055] In some embodiments of this application, the width of the bridge edge 221 in the circumferential direction of the plate body 210 is 0.2 mm to 5 mm. Optionally, the width of the bridge edge 221 is 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, or 4.5 mm. In some embodiments, the connecting sheet 220 is electrically connected to the electrode core 500, the connecting sheet 220 is connected to the plate body 210 via the bridge edge 221, and the bridge edge 221 may be used as a protective structure for the electrode core 500. If the length of the bridge edge 221 is selected, the length may be selected based on requirements regarding the maximum overcurrent and / or melting current of the electrode core 500, and as a result, if the maximum overcurrent and / or melting current of the electrode core 500 are exceeded, the excessive heat generated by the current flowing through the bridge edge 221 will melt the bridge edge 221, severing the electrical connection between the connecting sheet 220 and the plate body 210, and further severing the electrical connection between the electrode core 500 and the plate body 210, thereby avoiding a safety hazard.

[0056] In some embodiments of this application, a gap 222 exists between the connecting sheet 220 and the connecting slot 211 to release gas in the first current collector plate 200, and as a result, the electrolyte can flow smoothly through the gap 222 to a designated area.

[0057] In some embodiments, in which a first current collector plate 200 is used in a battery cell 1000, the connecting sheet 220 is electrically connected to the electrode core 500, and the electrolyte on the side of the plate body 210 and away from the electrode core 500 may flow to the electrode core 500 through the gap 222 between the connecting sheet 220 and the connecting slot 211, thereby potentially causing oxidation reactions at the anode of the electrode core 500 and reduction reactions at the cathode of the electrode core 500, thereby enabling directional movement of positive and negative ions, and consequently causing the electrode core 500 to generate an electric current.

[0058] In addition, during the discharge process, the battery cell 1000 generates gas, which is released from the gap 222 between the connection sheet 220 and the connection slot 211, thereby preventing the expansion of the battery cell 1000 from affecting user use.

[0059] In some optional embodiments of this application, the gaps 222 are provided at equal intervals around the connecting sheet 220, so that the electrolyte can flow uniformly through the gaps 222 into a designated area.

[0060] In some embodiments, as shown in Figures 8 and 9, when the connecting sheet 220 and the connecting slot 211 are coplanar, the multiple side walls of the connecting slot 211 include an outer edge side wall 2113, a first connecting side wall 2111, and a second connecting side wall 2112. The connecting sheet 220 is positioned on the outer edge side wall 2113, the first connecting side wall 2111, and the second connecting side wall 2112. The connecting sheet 220 is electrically connected to the first connecting side wall 2111 via a bridge edge 221, thereby allowing a gap 222 to be formed on the plate body 210 extending along the outer edge side wall 2113, the first connecting side wall 2111, and the second connecting side wall 2112.

[0061] In some embodiments, the width of the gap 222 formed on the plate body 210 and extending along the outer edge side wall 2113, the first connecting side wall 2111, and the second connecting side wall 2112 depends on the distance between the connecting sheet 220 and the side wall of the connecting slot 211, and the width of the gap 222 may be uniform or non-uniform.

[0062] As shown in Figure 9, in one embodiment in which the connection slot 211 is formed in a triangular shape, the outer edge sidewall 2113, the first connection sidewall 2111, and the second connection sidewall 2112 are connected to form a triangle, and a gap 222 is defined between the connection sheet 220 and the connection slot 211, extending along the outer edge sidewall 2113, the first connection sidewall 2111, and the second connection sidewall 2112, to release gas from the first current collector plate 200, and as a result, the electrolyte can flow smoothly through the gap 222 into the designated area.

[0063] In some other embodiments, in one embodiment where the connection slot 211 is formed in a fan shape, the side walls of the connection slot 211 further include an inner edge side wall 114. The axial projections of the outer edge side wall 2113 and the inner edge side wall 114 of the plate body 210 are arc-shaped. The outer edge side wall 2113 is located outside the inner edge side wall 114, and a gap 222 is defined between the connection sheet 220 and the connection slot 211, extending along the outer edge side wall 2113, the second connection side wall 2112, the inner edge side wall 114, and the first connection side wall 2111, to release gas in the first current collector plate 200, thereby allowing the electrolyte to flow smoothly through the gap 222 into a designated area.

[0064] In some other embodiments, when the connecting sheet 220 and the connecting slot 211 are on two planes, a gap is formed between the two opposing side walls of the connecting sheet 220 and the connecting slot 211, and a gap is formed between the two opposing planes of the connecting sheet 220 and the connecting slot 211. The gas in the first current collector plate 200 may be released through multiple gaps between the connecting sheet 220 and the connecting slot 211. In this way, the discharge efficiency of the first current collector plate 200 is improved and the electrolyte can flow smoothly to a designated area through multiple gaps 222.

[0065] In some optional embodiments of this application, the width of the gap 222 in the width direction of the plate body 210 is 0.2 mm to 5 mm in order to release the gas from the first current collector plate 200, and as a result the electrolyte can penetrate through the gap 222 to the electrode core 500.

[0066] For example, the width K of the gap 222 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm.

[0067] In some embodiments of this application, the intermediate section 2100 is a central hole 212 that penetrates the plate body 210 in the thickness direction of the plate body 210, thereby enabling an electrical connection between the plate body 210 and the conductive pillar 41 by using the central hole 212, and as a result, current on the plate body 210 can flow to the conductive pillar 41.

[0068] In some embodiments, the conductive pillar 41 passes through the central hole 212, thereby achieving an electrical connection between the conductive pillar 41 and the plate body 210 by using the central hole 212. As a result, current on the plate body 210 can flow smoothly to the external element through the conductive pillar 41, thereby achieving an electrical connection between the electrode core 500 and the external element.

[0069] In some embodiments, an opening is provided within the housing 600, and the conductive pillar 41 partially extends from the opening to the outside of the housing 600, thereby electrically connecting the conductive pillar 41 to an external element, which enables charging and discharging of the battery cell 1000.

[0070] In some embodiments, the plate body 210 has a plurality of connection slots 211 and a plurality of connection sheets 220. The plurality of connection slots 211 are spaced apart from each other in the circumferential direction of the intermediate section 2100. The plurality of connection sheets 220 are arranged in a one-to-one correspondence with the plurality of connection slots 211. Each connection sheet 220 is electrically connected to the plate body 210 via a corresponding bridge edge 221, so that current on the electrode core 500 can flow evenly from the connection sheets 220 in the plurality of connection slots 211 to the intermediate section 2100.

[0071] In some embodiments, the multiple connection slots 211 are spaced apart from each other in the circumferential direction of the central hole 212, so that the space on the plate body 210 can be used appropriately. In addition, to properly set the current flow path, the distance between the multiple connection slots 211 and the central hole 212 is controlled, and then the distance between the connection sheet 220 in the connection slot 211 and the central hole 212 is controlled so that the current on the multiple connection slots 220 can flow smoothly to the central hole 212 via the bridge edge 221 and then to the conductive pillar 41 in the central hole 212.

[0072] In addition, such a configuration helps to improve the space utilization rate of the plate body 210, which helps to reduce the space occupied by the plate body 210 within the battery cell 1000, thereby improving the internal space utilization rate of the battery cell 1000 and improving the energy density of the battery cell 1000.

[0073] In some embodiments of this application, the battery cell 1000 includes a first current collector plate 200 having a first limiting portion, a cover plate 44 fixed to the housing 600 of the battery cell 1000, and a separator 45 disposed between the first current collector plate 200 and the cover plate 44. The separator 45 is provided with a second limiting portion, and the first and second limiting portions cooperate to limit the separator 45.

[0074] In this way, relative rotation between the separator 45 and the first current collector plate 200 can be avoided, and as a result, the separator 45 is prevented from damaging the first current collector plate 200, and the insulating effect of the separator 45 is improved.

[0075] For example, as shown in Figures 3 and 4, the battery cell 1000 includes a first current collector plate 200 and a cover plate 44. The first current collector plate 200 is positioned within the housing 600 opposite a first tab, and is configured to be electrically connected to the first tab, so that the first tab is electrically connected to the first current collector plate 200 and can supply power. The cover plate 44 is positioned on the side of the first current collector plate 200 and away from the first tab, and is configured to be fixed to the housing 600 of the battery cell 1000 and to seal the open end of the housing 600 so as to prevent components within the housing 600 from coming out of the housing 600. It should be noted that the first current collector plate 200 may be formed by cutting a single piece, which would result in a lower difficulty in processing the first current collector plate 200 and higher structural stability.

[0076] In some embodiments, the battery cell 1000 is further provided with a separator 45, which is positioned between the first current collector plate 200 and the cover plate 44, and the separator 45 is configured to insulate the cover plate 44 from the first current collector plate 200, thereby avoiding electrical connection between the first current collector plate 200 and the cover plate 44. In addition, the first limiting portion may be positioned on the first current collector plate 200, and the second limiting portion may be positioned on the separator 45. The first and second limiting portions are positioned opposite each other and cooperate with each other so that the first current collector plate 200 can restrict the separator 45. Thus, relative rotation between the separator 45 and the first current collector plate 200 can be avoided, which helps to prevent the separator 45 from damaging the first current collector plate 200 and improve the insulating effect of the separator 45.

[0077] According to the battery cell 1000 in this embodiment of the present application, the first limiting portion is positioned on the first current collector plate 200, and the second limiting portion is positioned on the separator 45. The first limiting portion may cooperate with the second limiting portion to restrict the separator 45, thereby preventing relative rotation between the separator 45 and the first current collector plate 200, preventing the separator 45 from damaging the first current collector plate 200, improving the insulating effect of the separator 45, and thereby improving the reliability of the battery cell 1000.

[0078] In some embodiments of this application, one of the first and second limiting portions is a limiting notch 213, and the other is a limiting projection 454, the limiting projection 454 extending into the limiting notch 213.

[0079] For example, as shown in Figures 6 and 8, the first limiting portion may be provided as a limiting notch 213, and the second limiting portion may be provided as a limiting projection 454. In other words, the limiting projection 454 protruding from the separator 45 is located on the side of the separator 45 and facing the first current collector plate 200, and the first current collector plate 200 is provided with a limiting notch 213 that penetrates the first current collector plate 200 in the thickness direction. Alternatively, the first limiting portion may be provided as a limiting projection 454, and the second limiting portion may be provided as a limiting notch 213. In this way, the limiting projection 454 may extend into the limiting notch 213 to achieve circumferential restriction between the first current collector plate 200 and the separator 45. This helps to reduce the difficulty of processing the battery cell 1000, reduce processing costs, and improve the practicality of the battery cell 1000.

[0080] In some other embodiments, the first limiting portion may be provided as a circular through-hole, and the second limiting portion may be provided as a clamping jaw. In other words, the clamping jaw protruding from the separator 45 is positioned on the side of the separator 45 and facing the first current collector plate 200, and the first current collector plate 200 is provided with a circular through-hole that penetrates the first current collector plate 200 in the thickness direction. Alternatively, the first limiting portion may be provided as a clamping jaw, and the second limiting portion may be provided as a circular through-hole. Thus, the clamping jaw may engage with the circular through-hole to achieve circumferential restriction between the first current collector plate 200 and the separator 45.

[0081] In some embodiments of this application, there are a plurality of first limiting portions and a plurality of second limiting portions arranged spaced apart from each other in the circumferential direction of the first current collector plate 200, and the plurality of first limiting portions cooperate with the plurality of second limiting portions in a one-to-one correspondence.

[0082] For example, as shown in Figures 6, 8, and 9, a plurality of first limiting portions may be arranged on the first current collector plate 200, spaced apart from each other in the circumferential direction of the first current collector plate 200, and a plurality of second limiting portions may be provided on the separator 45, spaced apart from each other in the circumferential direction of the separator 45, and the plurality of first limiting portions and the plurality of second limiting portions face each other one-to-one and cooperate to achieve circumferential limiting between the first current collector plate 200 and the separator 45. In this way, relative rotation between the first current collector plate 200 and the separator 45 can be avoided, thereby ensuring that the avoidance region 453 can face the connection slot 211 and improving the stability of the battery cell 1000.

[0083] In some embodiments of this application, the first current collector plate 200, separator 45, cover plate 44, and conductive pillar 41 are connected to each other to form a cover plate assembly 400. In other words, the first current collector plate 200, separator 45, cover plate 44, and conductive pillar 41 are connected to each other to form a whole, which is then attached to the end of the housing 600 to seal the open end of the housing 600 and electrically connect to the first tab. The conductive pillar 41 may be connected to an external element.

[0084] In some embodiments of this application, the first current collector plate 200 is provided with a welding area electrically connected to the first tab, and the separator 45 is provided with a avoidance area 453, the avoidance area 453 is provided opposite the welding area and exposes the welding area.

[0085] For example, as shown in Figures 4 and 5, a welding area 216 may be provided on the first current collector plate 200, and the first current collector plate 200 may be welded to the first tab 501 in the welding area 216 to electrically connect to the electrode core 500. A bypass area 453 is provided on the separator 45, and the bypass area 453 is provided opposite the welding area of ​​the first current collector plate 200, so that the bypass area 453 can bypass the welding area and expose it. This reduces the difficulty of welding the first tab 501 and the first current collector plate 200. Therefore, the difficulty of installing the cover plate assembly 400 can be reduced, improving processing yield and production efficiency. In addition, the first current collector plate 200 does not need to be bent, and as a result, the space occupied by the cover plate assembly 400 in the Z direction is reduced, improving the capacity of the cover plate assembly 400.

[0086] In some embodiments of this application, the avoidance region 453 and the second limiting portion are spaced apart from each other in the circumferential direction of the separator 45. For example, as shown in Figures 5 and 6, the second limiting portion may be spaced apart from the avoidance region 453 in the circumferential direction of the separator 45, so that the first and second limiting portions can maintain a specific distance from the welding area. This helps to reduce the impact of the welding process on the first and second limiting portions, improve limiting accuracy, and enhance the reliability of the cover plate assembly 400.

[0087] In some embodiments, the first and second limiting portions may be provided radially outward of the first current collector plate 200 and the separator 45, respectively, to help reduce the difficulty of machining.

[0088] In some embodiments of this application, the first current collector plate 200 includes a plate body 210, a bridge edge 221, and a plurality of connecting sheets 220. The plate body 210 is provided with a plurality of spaced-apart connecting slots 211. Each connecting sheet 220 is connected to the inner wall of one of the connecting slots 211 via the bridge edge 221. Each connecting sheet 220 defines a welding area.

[0089] For example, as shown in Figures 8 and 9, the first current collector plate 200 includes a plate body 210, a bridge edge 221, and a plurality of connecting sheets 220. Connecting slots 211 are provided on the plate body 210. The connecting slots 211 are constructed to penetrate the plate body 210 in the vertical direction. A plurality of connecting slots 211 may be present, and the plurality of connecting slots 211 may be spaced apart from each other, for example, in the circumferential direction of the plate body 210.

[0090] A connecting sheet 220 is placed in each connecting slot 211. The connecting sheet 220 is designed according to the shape of the connecting slot 211, and the size of the connecting sheet 220 is smaller than the size of the connecting slot 211, so that the outer wall of the connecting sheet 220 is spaced apart from the inner wall of the connecting slot 211, and the edge on the side of the connecting slot 211 is connected to the inner wall of the corresponding connecting slot 211 via a bridge edge 221, thereby connecting the connecting sheet 220 to the plate body 210. Each connecting sheet 220 defines a welding area, and as a result, the connecting sheet 220 may be configured to be welded to the first tab 501. In this way, the connection area between the first current collector plate 200 and the first tab 501 can be increased, improving the current flow capability.

[0091] Since the connecting sheet 220 is connected to the plate body 210 using only the bridge edge 221, it can be understood that if the electrode core 500 vibrates, the connecting sheet 220 may deform slightly to absorb the impact force. This can reduce vibration tension at the welded joint between the first tab 501 and the connecting sheet 220, thereby improving the stability of the connection between the first current collector plate 200 and the first tab 501. In addition, the width of the bridge edge 221 may be adjustable to meet various rapid charging requirements of the battery cell 1000, thereby improving the practicality of the cover plate assembly 400.

[0092] In some embodiments of this application, the orthographic projection of the outer peripheral wall of the plate body 210 onto a first projection plane lies on a first ring, and the plate body 210 is provided with an intermediate section 2100 electrically connected to a conductive pillar 41. The connection slot 211 is located radially outward of the intermediate section 2100 in the radial direction of the plate body 210. The orthographic projection of the bridge edge 221 onto the first projection plane lies radially inward of the outer peripheral edge of the orthographic projection of the connection sheet 220. The conductive pillar 41 is electrically connected to an external element.

[0093] For example, as shown in Figure 9, the first projection plane is perpendicular to the thickness direction of the plate body 210. The outer periphery of the plate body 210 may be constructed in a ring shape by positioning the orthographic projection of the outer periphery of the plate body 210 to lie entirely on the first ring in the first projection plane. Alternatively, the orthographic projection of the outer periphery of the plate body 210 may be positioned to lie partially on the first ring. For example, protrusions or recesses may be formed on the outer periphery of the plate body 210 to construct the outer periphery of the plate body 210 in a substantially ring shape.

[0094] In some embodiments, an intermediate section 2100 is placed on the plate body 210, and the intermediate section 2100 is electrically connected to a conductive pillar 41. In addition, in the radial direction of the plate body 210, the connection slot 211 is located radially outward of the intermediate section 2100 and spaced apart from the conductive pillar 41. The connection slot 211 is constructed in a polygonal shape, and the orthographic projection of the bridge edge 221 onto the first projection plane is located radially inward of the outer peripheral edge of the orthographic projection of the connection sheet 220, resulting in a relatively short length of the conductive path between the first tab 501 of the electrode core 500 and the conductive pillar 41. In addition, the conductive pillar 41 is electrically connected to an external element, and as a result, the electrode core 500 can be electrically connected to an external element via the conductive pillar 41.

[0095] It can be understood that by setting the length of the conductive path between the electrode core 500 and the conductive pillar 41 to be relatively short, the length of the conductive path between the electrode core 500 and the external element can be shortened, thereby reducing the resistance of the conductive path and improving the current flow capability.

[0096] In some embodiments, the connection slot 211 may be constructed in a triangular shape, and the connection sheet 220 may be constructed in a corresponding triangular shape and connected to the plate body 210 on any side of the connection sheet 220 in the circumferential direction of the plate body 210, resulting in a relatively short loop length between the first tab 501 and the conductive pillar 41. Alternatively, the connection slot 211 may be constructed in a fan shape, and the connection sheet 220 may be constructed in a corresponding fan shape and connected to the plate body 210 on the side of the connection sheet 220 that faces the center of the plate body 210, or connected to the plate body 210 on any side of the connection sheet 220 in the circumferential direction of the plate body 210, resulting in a relatively short loop length between the first tab 501 and the conductive pillar 41.

[0097] In some embodiments of this application, the separator 45 is provided with a plurality of avoidance regions 453, and in a first direction, the plurality of avoidance regions 453 are provided in a one-to-one correspondence with a plurality of connection slots 211.

[0098] For example, as shown in Figures 4 and 5, the separator 45 may be provided with multiple avoidance areas 453. In the first direction, the multiple avoidance areas 453 are provided in a one-to-one correspondence with the multiple connection slots 211, so that the separator 45 can avoid the connection sheet 220. Thus, in the installation process of the cover plate assembly 400, the cover plate assembly 400 may be assembled first, and then the connection sheet 220 is welded to the first tab 501. Therefore, the difficulty of installing the cover plate assembly 400 can be reduced, and the practicality and reliability of the cover plate assembly 400 can be improved.

[0099] In some embodiments of this application, the diameter of the separator 45 is larger than the diameter of the first current collector plate 200, and as a result, the separator 45 can insulate the cover plate 44 from the first current collector plate 200, preventing the first current collector plate 200 from being electrically connected to the cover plate 44, thereby avoiding a short circuit in the housing 600.

[0100] Referring to Figure 5, the separator 45 in this embodiment of the present application includes a central portion 451 and a plurality of extension arms 452. The central portion 451 is provided with a first support surface 4512 for supporting the cover plate 44 of the cover plate assembly 400. The plurality of extension arms 452 are arranged on the central portion 451 and spaced apart from each other in the circumferential direction of the central portion 451. Avoidance regions 453 are defined between adjacent extension arms 452, and the avoidance regions 453 are positioned opposite the welded area of ​​the first current collector plate 200 to expose the welded area.

[0101] In this way, the difficulty of welding the first current collector plate 200 can be reduced, and processing yield and production efficiency can be improved.

[0102] For example, as shown in Figures 5 and 6, the separator 45 includes a central portion 451, which is constructed in an annular shape, and as a result, the separator 45 may be sleeved to the outside of the conductive pillar 41. The central portion 451 forms a first support surface 4512 around the conductive pillar 41, and the first support surface 4512 is configured to support the side walls of the cover plate 44 and the opposing side walls facing the first current collector plate 200, thereby restricting the cover plate 44.

[0103] The separator 45 further includes extension arms 452, which are connected to the edge of the central portion 451 and extend radially outward from the central portion 451. Multiple extension arms 452 are arranged, spaced apart from each other in the circumferential direction of the central portion 451. A clearance area 453 is defined between two adjacent extension arms 452, and the clearance area 453 is positioned opposite the welding area of ​​the first current collector plate 200, so that the clearance area 453 can avoid the connection slot 211 and expose the welding area. This reduces the difficulty of welding between the first tab 501 and the first current collector plate 200. Thus, the difficulty of mounting the cover plate assembly 400 can be reduced, improving processing yield and production efficiency. In addition, the first current collector plate 200 does not need to be bent, and as a result, the space occupied by the cover plate assembly 400 in the Z direction is reduced, improving the reliability of the cover plate assembly 400.

[0104] According to the separator 45 in this embodiment of the present application, a avoidance region 453 is provided, and as a result, the separator 45 can avoid the welding region of the first current collector plate 200 and expose the welding region. This helps to reduce the difficulty of welding and to improve processing yield and production efficiency.

[0105] In some embodiments of this application, the central portion 451 is formed in a disc shape, the outer diameter of the central portion 451 is Dcn, the orthographic projection of the outer peripheral wall of the separator 45 onto a first plane lies on the same circle, the outer diameter of the separator 45 is Dcw, the separator 45 satisfies the following relationship: 0.85*Dcw≧Dcn≧0.4*Dcw, and the first plane is provided perpendicular to the thickness direction of the separator 45.

[0106] For example, as shown in Figure 4, the central portion 451 may be formed in a disc shape, and the outer diameter of the central portion 451 may be set to Dcn. The first plane is positioned perpendicular to the thickness direction of the separator 45, and the orthographic projection of the outer peripheral wall of the separator 45 onto the first plane lies on the same circle. The outer diameter of the separator 45 may be set to Dcw, satisfying the following relationship: 0.85 × Dcw ≥ Dcn ≥ 0.4 × Dcw. In other words, the outer diameter Dcn of the central portion 451 may be set to 0.4 times or more the outer diameter Dcw of the separator 45, and 0.85 times or less the outer diameter Dcw of the separator 45. In this specification, the first direction may be the height direction of the battery cell 1000 shown in the figure, that is, the thickness direction of the cover plate 44 and the separator 45.

[0107] With the aforementioned configuration, the avoidance region 453 may have a sufficient size in the radial direction of the separator 45, and as a result, the avoidance region 453 can sufficiently avoid the welding area. This helps to reduce the difficulty of welding and prevents the structural strength of the separator 45 from becoming excessively low due to the size of the central portion 451 being too small, and as a result, the reliability of the separator 45 is improved.

[0108] In some embodiments of this application, the ratio of the total area of ​​the avoidance region 453 to the area of ​​the circular region in the separator 45 where the avoidance region 453 is provided is S2, satisfying 0.35 ≤ S2 ≤ 0.9.

[0109] For example, as shown in Figure 4, the ratio of the total area of ​​the multiple avoidance areas 453 to the area of ​​the circular region in the separator 45 where the avoidance areas 453 are provided may be set to S2, satisfying 0.35 ≤ S2 ≤ 0.9. In other words, the ratio S2 of the total area of ​​the multiple avoidance areas 453 to the area of ​​the circular region in the separator 45 where the avoidance areas 453 are provided may be set to 0.45. Alternatively, the ratio S2 of the total area of ​​the multiple avoidance areas 453 to the area of ​​the circular region in the separator 45 where the avoidance areas 453 are provided may be set to 0.6. Alternatively, the ratio S2 of the total area of ​​the multiple avoidance areas 453 to the area of ​​the circular region in the separator 45 where the avoidance areas 453 are provided may be set to 0.75. This is not limited to the present application.

[0110] With the above configuration, the separator 45 can sufficiently avoid the welding area of ​​the first current collector plate 200, resulting in a sufficiently large exposed area of ​​the welding region, effectively reducing the difficulty of welding, and improving processing yield and production efficiency.

[0111] In some embodiments of this application, the angle between any two adjacent extension arms 452 is b, satisfying 10° ≤ b ≤ 160°. For example, as shown in Figure 4, the extension arms 452 may be arranged to extend radially outward from the central portion 451, and the lateral edges of two adjacent extension arms 452 facing each other form an angle, the angle is set to b, satisfying 10° ≤ b ≤ 160°. In other words, the angle b between two adjacent extension arms 452 may be set to 20°. Alternatively, the angle b between any two adjacent extension arms 452 may be set to 85°. Alternatively, the angle b between any two adjacent extension arms 452 may be set to 150°. This is not limited to the present application.

[0112] As described above, the separator 45 may have multiple different structures (for example, it may have 2 to 12 avoidance regions 453), and as a result, the separator 45 can be adapted to the first current collector plate 200 of different structures, and it is possible to avoid the opening of the avoidance region 453 being excessively small or the number of avoidance regions 453 being excessively large, thereby helping to improve the welding effect, reduce the difficulty of processing, and improve the practicality of the separator 45.

[0113] In some embodiments of this application, the orthogonal projections of the outer peripheral wall of the cover plate 44 onto a first plane lie on the same circle, the central portion 451 is formed in a disc shape, the outer diameter of the cover plate 44 is Dt, the outer diameter of the central portion 451 is Dcn, the cover plate assembly 400 satisfies Dt + 5 mm ≥ Dcn ≥ Dt, and the first plane is positioned perpendicular to the thickness direction of the cover plate 44.

[0114] For example, as shown in Figure 4, the first plane is positioned perpendicular to the thickness direction of the cover plate 44, the orthogonal projection of the outer peripheral wall of the cover plate 44 onto the first plane lies on the same circle, and the central portion 451 is formed in a disc shape. In some embodiments, the outer diameter of the cover plate 44 may be set to Dt, and the outer diameter of the central portion 451 may be set to Dcn, satisfying Dt + 5 mm ≥ Dcn ≥ Dt. In other words, the outer diameter Dcn of the central portion 451 may be set to be greater than or equal to the outer diameter Dt of the cover plate 44 and less than or equal to the sum of the outer diameter Dt of the cover plate 44 and 5 mm. In this way, the separator 45 may completely separate the cover plate 44 from the first current collector plate 200, thereby reducing the possibility of a short circuit in the housing and ensuring sufficient area in the avoidance region 453 to facilitate welding.

[0115] In some embodiments of this application, a second limiting portion is provided on at least one extension arm 452 and / or central portion 451, the second limiting portion being adapted to cooperate with a first limiting portion on the first current collector plate 200.

[0116] For example, as shown in Figures 5 and 6, a second limiting portion may be provided on each of the multiple extension arms 452, or multiple second limiting portions may be provided on the central portion 451, with the multiple second limiting portions spaced apart from each other in the circumferential direction of the central portion 451. In addition, multiple first limiting portions may be provided on the first current collector plate 200, and the multiple second limiting portions and the multiple first limiting portions face each other and cooperate in a one-to-one correspondence, so that the first current collector plate 200 and the separator 45 can be restricted from each other in the circumferential direction.

[0117] In this way, relative rotation between the first current collector plate 200 and the separator 45 can be avoided, and as a result, the avoidance region 453 can always face the welding region, thereby improving the reliability of the cover plate assembly 400.

[0118] In some embodiments of this application, as shown in Figures 5 and 6, the second limiter may be located at the end of the extension arm 452, away from the central portion 451. With the above configuration, the second limiter can be located at the end of the separator 45, and as a result, the second limiter and the first limiter can be spaced apart from the welding area, thereby reducing the influence of the welding process on the second limiter and the first limiter and improving limiting accuracy. This helps to improve the reliability of the cover plate assembly 400.

[0119] In some embodiments of this application, the second limiting portion is a limiting projection 454. For example, as shown in Figure 6, the second limiting portion may be provided as a limiting projection 454, and the first limiting portion may be provided as a limiting notch 213. The limiting projection 454 extends into the limiting notch 213, thereby achieving circumferential limiting between the first current collector plate 200 and the separator 45. In this way, the cooperative stability between the separator 45 and the first current collector plate 200 can be improved.

[0120] In some embodiments of this application, a first support projection 4511 is provided on the central portion 451, and the first support projection 4511 defines a first support surface 4512. For example, as shown in Figures 5 and 6, the first support projection 4511 may be positioned on the central portion 451, projecting upward, and the first support projection 4511 extends around the conductive pillar 41, with the upper side of the first support projection 4511 defining a first support surface 4512, which is configured to abut against the bottom wall of the cover plate 44, thereby separating the bottom wall of the cover plate 44 from the upper wall of the central portion 451. Therefore, the contact area between the cover plate 44 and the central portion 451 may be reduced, and the precision requirements of the cover plate assembly 400 may be reduced.

[0121] In some embodiments of this application, a second support projection 4521 is positioned on the extension arm 452 and is adapted to stop the housing 600. For example, as shown in Figures 5 and 6, the second support projection 4521 may be positioned on the upper side of each extension arm 452, the second support projection 4521 protruding upward, and the second support projection 4521 may stop the inner wall of the end of the housing 600. As a result, by using the second support projection 4521, the housing 600 can apply a Z-direction restriction to the electrode core 500, thereby reducing the Z-direction movement of the electrode core 500. In addition, the upper wall of the central portion 451 and the inner walls of the end of the cover plate 44 are kept spaced apart from each other to form an electrolyte storage space, which is used to contain the electrolyte. As a result, the electrolyte capacity of the housing 600 can be increased, and the stability of the battery's long-life cycle can be improved. This helps improve the reliability of the 1000 battery cells.

[0122] In some embodiments, a release groove 4522 may be formed in the center of the second support projection 4521 to help reduce the difficulty of demolding the separator 45 and to improve the processing quality of the separator 45.

[0123] In some embodiments of this application, as shown in Figures 5 and 6, the projection height of the second support projection 4521 is at least the projection height of the first support projection 4511. In some embodiments, the height difference between the first support projection 4511 and the second support projection 4521 may be set to 3 mm or less. The above setting reduces the gap between the upper wall of the second support projection 4521 and the inner wall of the end of the housing 600, which helps to improve the limiting effect of the second support projection 4521, and as a result, the movement of the electrode core 500 in the Z direction is reduced, improving the usability of the separator 45.

[0124] In some embodiments of this application, a first central hole 4513 is provided in the central portion 451, and a second central hole 4514 communicating with the first central hole 4513 is provided in the first support projection 4511, wherein the diameter of the second central hole 4514 is larger than the diameter of the first central hole 4513.

[0125] For example, as shown in Figure 3, the lower end of the conductive pillar 41 is formed at the first end 412. The diameter of the first end 412 is larger than the diameter of the pillar body of the conductive pillar 41. The first end 412 is configured to be welded to the first current collector plate 200 in order to increase the connection area between the first current collector plate 200 and the conductive pillar 41 and to reduce the resistance of the conductive path.

[0126] In some embodiments, as shown in Figures 5 and 6, a first central hole 4513 may be provided in the central portion 451, the diameter of which is the first central hole 4513, which is the same as the diameter of the first end portion 412, and as a result the first end portion 412 may extend into the first central hole 4513. In this way, the separator 45 can be sleeved to the outside of the first end portion 412. A first support projection 4511 extends around the conductive pillar 41, and a second central hole 4514 is formed in the first support projection 4511. The second central hole 4514 and the first central hole 4513 are coaxial and communicate with each other, and the diameter of the second central hole 4514 is larger than the diameter of the first central hole 4513. The first insulating member 46 is fitted into the second central hole 4514, and the diameter of the first insulating member 46 is larger than the diameter of the second end 411. The first insulating member 46 can completely separate the cover plate 44 from the second end 411 of the conductive pillar 41. In this way, the insulation performance between the cover plate 44 and the second end 411 can be improved, and short circuits of the housing 600 can be effectively avoided.

[0127] In some embodiments of this application, the separator 45 further includes a flange 455, which is connected to the ends of a plurality of extension arms 452 and extends away from the first support surface 4512.

[0128] For example, as shown in Figure 7, a flange 455 is further provided on the separator 45. The flange 455 is constructed to extend circumferentially around the separator 45. One end of the flange 455 is connected to the end walls of a plurality of extension arms 452, and the other end extends away from the first support surface 4512 (i.e., downward). The extending length of the flange 455 is greater than the height of the first tab 501 in the Z direction. Thus, after the cover plate 44 is assembled to the housing 600, the flange 455 may extend between the first tab 501 and the housing 600 to provide insulation. Therefore, a short circuit caused by contact between the first tab 501 and the housing 600 can be avoided, thereby improving the safety of the battery cell 1000.

[0129] In some embodiments of this application, a metal connecting member 43 is further included. The first end 412 of the conductive pillar 41 is electrically connected to the intermediate section 2100 of the first current collector plate 200, the second end 411 of the conductive pillar 41 is electrically connected to the metal connecting member 43, a first insulating member 46 is positioned between the metal connecting member 43 and the cover plate 44, and a second insulating member 47 is positioned between the conductive pillar 41 and the cover plate 44.

[0130] For example, as shown in Figures 2 and 3, the cover plate assembly 400 includes a conductive pillar 41 and a metal connecting member 43, the conductive pillar 41 having first end 412 and second end 411 at both ends, respectively. The first current collector plate 200 and the metal connecting member 43 are positioned at both ends of the conductive pillar 41, and the intermediate section 2100 of the first current collector plate 200 may be electrically connected to the first end 412, so that the electrode core 500 may be electrically connected to the conductive pillar 41. In addition, the metal connecting member 43 may be electrically connected to the second end 411 of the conductive pillar 41, and an electrical connection surface may be formed on the side wall of the metal connecting member 43 and on the side wall away from the first current collector plate 200, so that the electrode core 500 can receive power through the electrical connection surface. In some embodiments, the material of the metal connecting member 43 may be aluminum.

[0131] In some embodiments, a first insulating member 46 may be placed between the metal connecting member 43 and the cover plate 44. The first insulating member 46 is constructed in an annular shape with a larger diameter than the metal connecting member 43. A accommodating groove is formed on the side of the first insulating member 46 and away from the cover plate 44, and the metal connecting member 43 may extend into the accommodating groove. As a result, the first insulating member 46 can insulate the cover plate 44 from the metal connecting member 43, thereby avoiding electrical connection between the metal connecting member 43 and the cover plate 44. In addition, a second insulating member 47 may be placed between the cover plate 44 and the conductive pillar 41. The second insulating member 47 is configured to insulate the conductive pillar 41 from the cover plate 44, thereby avoiding electrical connection between the conductive pillar 41 and the cover plate 44. With the above configuration, electrical connection between the cover plate 44 and the electrode core 500 is avoided, preventing a short circuit in the housing 600, thereby improving the reliability of the cover plate assembly 400.

[0132] In some embodiments of this application, the minimum diameter of the conductive pillar 41 may be set to L1, and the minimum diameter L1 of the conductive pillar 41 is set to be 2 mm or more. The diameter of the first current collector plate 200 may be set to L2, and the diameter L2 of the first current collector plate 200 is set to be 10 mm or more. The height of the conductive pillar 41 may be set to H1, and the height of the conductive pillar 41 is 0.5 mm or more and 10 mm or less. Thus, the reliability of the riveting and the current flow capability can be improved.

[0133] In some embodiments of this application, a portion of the second insulating member 47 is located between the cover plate 44 and the first end 412. For example, as shown in Figure 3, the diameter of the first end 412 may be set to be larger than the diameter of the second end 411, resulting in a larger size for the first end 412. This increases the contact area between the first current collector plate 200 and the conductive pillar 41, thereby reducing the resistance of the conductive path. In addition, a portion of the second insulating member 47 extends horizontally, between the cover plate 44 and the first end 412, so that the second insulating member 47 insulates the cover plate 44 from the first end 412, thereby avoiding electrical connection between the cover plate 44 and the conductive pillar 41. In this way, the insulating performance of the cover plate 44 is improved.

[0134] In some embodiments of this application, the second insulating member 47 may be provided as an elastic member. With the above configuration, after the second end 411 of the conductive pillar 41 is deformed and riveted, the portion of the second insulating member 47 between the cover plate 44 and the first end 412 is subjected to stress and deformed, and the second insulating member 47 may be subjected to an external elastic force, as a result the metal connector member 43, the first insulating member 46, the cover plate 44, the second insulating member 47, and the separator 45 are tightly connected, preventing relative movement between the metal connector member 43, the first insulating member 46, the cover plate 44, the second insulating member 47, and the separator 45. This helps to improve the overall stability of the cover plate assembly 400.

[0135] In some embodiments of this application, a mounting hole 4411 is provided in the cover plate 44, the conductive pillar 41 passes through the mounting hole 4411, and the first insulating member 46 is provided with an extended projection 461 that extends into the mounting hole 4411, the extended projection 461 stopping the second insulating member 47.

[0136] For example, as shown in Figures 3 and 11, a mounting hole 4411 may be provided at the center of the cover plate 44, the mounting hole 4411 penetrating the cover plate 44 vertically, the diameter of the mounting hole 4411 being larger than the diameter of the conductive pillar 41, the conductive pillar 41 being able to pass through the mounting hole 4411, and the inner circumferential wall of the mounting hole 4411 being spaced apart from the outer circumferential wall of the conductive pillar 41. An extension projection 461 is formed on the inner edge of the first insulating member 46, and the extension projection 461 is constructed to extend downward. The extension projection 461 may extend between the outer circumferential wall of the conductive pillar 41 and the inner circumferential wall of the mounting hole 4411, and the lower end of the extension projection 461 may abut against the second insulating member 47. In this way, the first insulating member 46 and the second insulating member 47 may cooperate to completely separate the conductive pillar 41 from the cover plate 44. Therefore, the insulating performance of the cover plate 44 is improved, and the possibility of electrical leakage in the housing 600 is reduced.

[0137] In some embodiments of this application, the intermediate section 2100 is formed in a central hole 212 that penetrates the first current collector plate 200 in the thickness direction, the first end 412 is located within the central hole 212, and the outer circumferential wall of the first end 412 is welded to the inner wall of the central hole 212. For example, as shown in Figures 8 and 9, the intermediate section 2100 is formed in a central hole 212, which is constructed to penetrate the first current collector plate 200 in the thickness direction. That is, the central hole 212 may penetrate the first current collector plate 200 in the vertical direction. At least a portion of the first end 412 may extend downward within the central hole 212, and the outer circumferential wall of the first end 412 may be welded to the inner wall of the central hole 212 to ensure a stable attachment between the first end 412 and the first current collector plate 200.

[0138] The aforementioned configuration allows for avoidance of large-area overlap between the conductive pillar 41 and the first current collector plate 200, which can help reduce the precision requirements of the cover plate assembly 400. In addition, the conductive pillar 41 and the first current collector plate 200 may be welded from the underside of the first current collector plate 200, which helps reduce the difficulty of welding the first current collector plate 200.

[0139] In some embodiments of this application, the conductive pillar 41 extends in a first direction. In the first direction, the metal connecting member 43, the cover plate 44, and the separator 45 are continuously sleeved onto the conductive pillar 41, and the second end 411 is deformed under pressure, so that at least a portion of the second end 411 is located on the side of the metal connecting member 43 away from the first current collector plate 200 and in contact with the metal connecting member 43.

[0140] For example, as shown in Figure 3, the conductive pillar 41 may be arranged to extend in a first direction. In the first direction, the upper end of the conductive pillar 41 is formed at the second end 411, and the lower end of the conductive pillar 41 is formed at the first end 412. The metal connecting member 43, the cover plate 44, and the separator 45 are sleeved in a continuous manner to the outside of the conductive pillar 41. The metal connecting member 43 may be electrically connected to the second end 411, and the separator 45 is configured to insulate the cover plate 44 from the first current collector plate 200.

[0141] In some embodiments, a stepped groove is formed on the side of the metal connector 43 and away from the first current collector plate 200, and the stepped groove is positioned around the conductive pillar 41. After the metal connector 43 is sleeved to the outside of the conductive pillar 41, the second end 411 of the conductive pillar 41 may be compressed to deform the second end 411 under pressure, so that at least a portion of the second end 411 extends into the stepped groove and comes into contact with the metal connector 43. The second end 411 is riveted to the metal connector 43 to apply a downward force to the metal connector 43. The metal connector 43, the first insulating member 46, the cover plate 44, the second insulating member 47, and the separator 45 are pressed and tightened to assemble the cover plate assembly 400. In addition, the contact area between the conductive pillar 41 and the metal connector 43 can be increased, and the resistance of the conductive path can be reduced.

[0142] It is understood that the metal connecting member 43 and the conductive pillar 41 may be formed separately, and then the metal connecting member 4330 may be sleeved onto the conductive pillar 41, so that the conductive pillar 41 rivets and restricts the metal connecting member 43, thereby assembling the cover plate assembly 400. This can reduce the difficulty of assembling the cover plate assembly 400, improve the surface flatness and cylindricity of the conductive pillar 41, and improve the reliability of the cover plate assembly 400.

[0143] In some embodiments of this application, an assembly hole 6201 is provided at the end of the housing 600, which is the end closest to the first current collector plate 200, and the cover plate 44 seals the assembly hole 6201.

[0144] For example, as shown in Figure 1, the battery cell 1000 is provided with a housing 600 and an electrode core 500, the housing 600 forming a housing cavity, and an assembly hole 6201 is provided at the end of the housing 600, the end closest to the first current collector plate 200 in the first direction, the electrode core 500 is placed in the housing cavity of the housing 600, and as a result the housing 600 can separate the electrode core 500 from the outside. In some embodiments, a cover plate 44 is connected to the housing 600, and the cover plate 44 may seal the assembly hole 6201 to prevent the housing cavity from directly communicating with the outside of the housing 600 through the assembly hole 6201.

[0145] In some embodiments of this application, the cover plate 44 includes a plate body 441 and a first stopper 442. The first stopper 442 is located on the outer periphery of the plate body 441 and is located inside the housing 600 to stop the inner wall of the housing 600. The first stopper 442 is fixed to the housing 600, and the plate body 441 is sleeved to a conductive pillar 41 and fixed to the housing 600.

[0146] For example, as shown in Figure 11, the cover plate 44 includes a plate body 441 and a first stopper 442. The plate body 441 is constructed in a ring shape, and as a result, the plate body 441 is sleeved to the outside of the conductive pillar 41. The first stopper 442 is located below the outer peripheral edge of the plate body 441 and extends in the circumferential direction of the plate body 441. When the cover plate 44 is attached to the housing 600, the first stopper 442 is located within the housing space of the housing 600 and may position the cover plate assembly 400 by stopping the inner wall of the housing 600 around the assembly hole 6201. In addition, the first stopper 442 may be fixed to the housing 600, for example, by welding or joining, to achieve a stable mounting of the cover plate 44 and the housing 600. This helps to improve the mounting accuracy of the cover plate assembly 400 and improve the reliability of the battery cell 1000.

[0147] In some embodiments of this application, the battery cell 1000 further includes a cover plate 44 fixed to an end of the housing 600 and an end close to the first current collector plate 200, a separator 45 positioned between the first current collector plate 200 and the cover plate 44, and a heat-shrinkable insulating film 30 enclosing at least a portion of the outer peripheral wall of the electrode core 500 and a portion of the separator 45. The cover plate 44 is exposed to the heat-shrinkable insulating film.

[0148] For example, as shown in Figures 1 and 15, the battery cell 1000 includes a first current collector plate 200 and a cover plate 44. The first current collector plate 200 is positioned within the housing 600 opposite a first tab, and is configured to be electrically connected to the first tab, so that the first tab is electrically connected to the first current collector plate 200 and can supply power. The cover plate 44 is positioned on the side of the first current collector plate 200 and away from the first tab, and is configured to be fixed to the housing 600 of the battery cell 1000 and to seal the open end of the housing 600 so as to prevent components within the housing 600 from coming out of the housing 600. It should be noted that the first current collector plate 200 may be formed by cutting a single piece, which would result in a lower difficulty in processing the first current collector plate 200 and higher structural stability.

[0149] In some embodiments, the battery cell 1000 is further provided with a separator 45, which is positioned between the first current collector plate 200 and the cover plate 44, and the separator 45 is configured to insulate the cover plate 44 from the first current collector plate 200, thereby avoiding electrical connection between the first current collector plate 200 and the cover plate 44 and avoiding safety hazards such as short circuits.

[0150] The heat-shrinkable insulating film 30 wraps at least a portion of the outer periphery wall of the electrode core 500, and the heat-shrinkable insulating film 30 covers a portion of the separator 45. Since the separator 45 is located on the side of the first current collector plate 200 and away from the first tab 501, that is, the first current collector plate 200 is located between the first tab 501 and the separator 45, when the heat-shrinkable insulating film 30 wraps at least a portion of the outer periphery wall of the electrode core 500 and a portion of the separator 45, the heat-shrinkable insulating film 30 can provide insulating protection to the outer periphery wall of the electrode core 500 and the first current collector plate 200. In this way, the leakage area of ​​the first current collector plate 200 is reduced, and insulating protection is performed in the protected portion of the first current collector plate 200.

[0151] In an embodiment in which an electrode core 500 is used in a battery cell 1000, the battery cell 1000 has a housing 600, the electrode core 500 is placed inside the housing 600, the heat-shrinkable insulating film 30 wraps at least a portion of the outer peripheral wall of the electrode core 500, and the heat-shrinkable insulating film 30 covers a portion of the separator 45, thereby preventing the outer peripheral wall of the electrode core 500 and the first current collector plate 200 from coming into contact with the housing 600, and preventing the outer peripheral wall of the electrode core 500 and the first current collector plate 200 from being electrically connected to the housing 600, thus avoiding problems such as short circuits in the battery cell 1000. In this way, the operational safety of the battery cell 1000 is improved, and the operational stability of the battery cell 1000 is improved.

[0152] In some embodiments, the first tab 501 of the electrode core 500 is electrically connected to the first current collector plate 200, the separator 45 is located on the other side of the first current collector plate 200, and the heat-shrinkable insulating film 30 covers at least a portion of the outer surface of the electrode core 500 and a portion of the separator 45. In this case, the separator 45 and the heat-shrinkable insulating film 30 work together to provide insulating protection to the first current collector plate 200, so that current on the first current collector plate 200 flows to a designated area and is prevented from flowing to the housing 600, thereby preventing a short circuit.

[0153] In addition, the heat-shrinkable insulating film 30 covers a portion of the separator 45, and as a result, the heat-shrinkable insulating film 30 can cover the outer circumferential surface and the edges of the electrode core 500. Furthermore, the heat-shrinkable insulating film 30 is bent at a position corresponding to the first tab 501, and as a result, the heat-shrinkable insulating film 30 can be directly fixed to the outer circumferential surface of the electrode core 500, thereby preventing the heat-shrinkable insulating film 30 from coming off the outer circumferential surface of the electrode core 500.

[0154] Specifically, if the temperature of the heat-shrinkable insulating film 30 is higher than the glass transition temperature of the heat-shrinkable insulating film 30, the heat-shrinkable insulating film 30 changes from a hard solid glass state to a fluid state. In this case, the heat-shrinkable insulating film 30 can be stretched to adjust its shape, length, etc. After the stretching of the heat-shrinkable insulating film 30 is complete, the heat-shrinkable insulating film 30 is cooled. In this case, the heat-shrinkable insulating film 30 changes from a fluid state to a glass state. In this case, the heat-shrinkable insulating film 30 can cover at least a portion of the outer surface of the electrode core 500 and a portion of the separator 45.

[0155] Implementing insulating protection for the electrode core 500 in this manner helps to adjust the shape, length, etc. of the heat-shrinkable insulating film 30 in a timely manner based on the specific shape of the electrode core 500, thereby avoiding the waste of resources. In addition, in this method, the heat-shrinkable insulating film 30 can be directly coated and fixed to the outer surface of the electrode core 500, and no other components are required to bond or fix the heat-shrinkable insulating film 30, thereby helping to reduce the complexity of installation and the difficulty of processing.

[0156] Accordingly, according to the electrode core 500 in this embodiment of the present application, a heat-shrinkable insulating film 30 is coated over the electrode core 500 and the first current collector plate 200, thereby providing insulating protection to the outer periphery walls of the electrode core 500 and the first current collector plate 200 so as to prevent the outer periphery walls of the electrode core 500 and the first current collector plate 200 from being electrically connected to the housing 600 of the battery cell 1000, thereby preventing short circuits. The coating is stable and the protective capacity is strong. In addition, in this method, the heat-shrinkable insulating film 30 can be placed on the electrode core 500 without any other fixing structure, thereby helping to reduce processing complexity and manufacturing costs.

[0157] In some embodiments of this application, as shown in Figure 4, a plurality of welded areas 216 are provided on the first current collector plate 200, and each welded area 216 is welded to the first tab 501 to stably fix the first current collector plate 200 to the first tab 501 so as to realize an electrical connection between the first tab 501 and the first current collector plate 200, and as a result, current on the electrode core 500 can flow to the first current collector plate 200 through the first tab 501.

[0158] The separator 45 is provided with multiple avoidance regions 453, which are arranged in a one-to-one correspondence with multiple welding regions 216. The heat-shrinkable insulating film 30 is located outside the multiple avoidance regions 453, exposing them. As a result, when the first current collector plate 200 is welded to the first tab 501, the welding device can reach the welding regions 216 through the avoidance regions 453 and perform operations in the welding regions 216, thereby achieving a welded connection between the welding regions 216 and the first tab 501.

[0159] As shown in Figures 1 to 15, in this embodiment, a plurality of welding regions 216 are spaced apart from each other in the circumferential direction of the first current collector plate 200, and the welding regions 216 are welded to the first tab 501 to provide a fixed electrical connection between the welding regions 216 and the first current collector plate 200. A plurality of avoidance regions 453 are spaced apart from each other in the circumferential direction of the separator 45, and the avoidance regions 453 are constructed to penetrate the separator 45 in a first direction. It should be noted that in this specification, the aforementioned directions are defined only to facilitate the explanation of the accompanying drawings and do not restrict the actual placement and orientation of the electrode core 500.

[0160] In the first direction, multiple welding areas 216 are provided in a one-to-one correspondence with multiple avoidance areas 453. In the process of installing the cover plate assembly 400, the cover plate assembly 400 may be assembled first, and then the first current collector plate 200 and the first tab 501 are welded. Thus, the difficulty of installing the cover plate assembly 400 can be reduced, and the practicality and reliability of the cover plate assembly 400 can be improved.

[0161] In some embodiments of the present application, the cover plate 44 is exposed to the heat-shrinkable insulating film 30, and the separator 45 and the current collector plate 21 are protected by using the cover plate 44. In addition, the cover plate 44 is disposed at an end of the housing 600, and the cover plate 44 is adapted to be fixed to the housing 600, and the cover plate 44 and the housing 600 are welded, whereby the end of the housing 600 is sealed by using the cover plate 44. As a result, the electrode core 500, the heat-shrinkable insulating film 30, the current collector plate 21, and the separator 45 are disposed within the housing 600, and the electrode core 500, the heat-shrinkable insulating film 30, the current collector plate 21, and the separator 45 are protected by using the housing 600.

[0162] In some embodiments of the present application, the heat-shrinkable insulating film 30 is a single-layer or multi-layer polyolefin film and a polymer polyester film having heat-shrinkable properties. Such a heat-shrinkable insulating film 30 is inexpensive, has a low processing temperature, a wide processing temperature range, and the process of coating the heat-shrinkable insulating film 30 is simple and efficient, thereby helping to reduce costs.

[0163] In some optional embodiments of the present application, as shown in FIGS. 13 to 16, the electrode core 500 is formed in a cylindrical shape. The minimum value of the radial interval between the outer edge of the cover plate 44 and the outer peripheral wall of the electrode core 500 is d1, the radius of the electrode core 500 is R, and the value range of d1 is 4 mm ≤ d1 < R. It is specified that 4 mm ≤ d1, thereby avoiding that the distance between the outer edge of the cover plate 44 and the outer peripheral wall of the electrode core 500 becomes excessively small, and avoiding that the diameter of the cover plate 44 becomes excessively large, thereby ensuring that the separator 45 can separate the cover plate 44 from the electrode core 500, and ensuring the insulating ability of the separator 45 with respect to the cover plate 44 and the first current collector plate 200. It is specified that d1 < R so that the cover plate 44 is disposed at an appropriate position at the end of the electrode core 500, and the cover plate 44 can protect the electrode core 500, the first current collector plate 200, and the separator 45. In addition, it is convenient to weld the cover plate 44 to the end of the housing 600 to seal the housing 600 and protect the electrode core 500 within the housing 600.

[0164] Specifically, when the cover plate 44 is positioned at the end of the electrode core 500, the radial distance between the outer edge of the cover plate 44 and the outer peripheral wall of the electrode core 500 at different positions may be different. As a result, the minimum value of the radial distance between the outer edge of the cover plate 44 and the outer peripheral wall of the electrode core 500 is greater than 4 mm. This avoids the distance between the outer edge of the cover plate 44 and the outer peripheral wall of the electrode core 500 becoming excessively small, and avoids the diameter of the cover plate 44 becoming excessively large. This ensures that the separator 45 can separate the cover plate 44 from the electrode core 500 and ensures the insulating ability of the separator 45 to the cover plate 44 and the first current collector plate 200.

[0165] In some embodiments, the cover plate 44 is formed in a disc shape and is positioned coaxially with the electrode core 500. In this case, the radial distance between the outer edge of the cover plate 44 and the outer peripheral wall of the electrode core 500 at different positions is equal, and the radial distance between the cover plate 44 and the outer peripheral wall of the electrode core 500 is d1.

[0166] In some embodiments of this application, as shown in Figures 13 to 16, the second tab 502 is located at the other end of the electrode core 500 in a first direction, and the first tab 501 and the second tab 502 are located at both ends of the electrode core 500 in a first direction. An annular weld area 5141 is provided on the second end face 514 of the second tab 502. The heat-shrinkable insulating film 30 covers a portion of the second end face 514, leaving the annular weld area 5141 exposed, so that the annular weld area 5141 can be avoided when a portion of the second end face 514 is protected, and the second end face 514 can be welded to another component through the annular weld area 5141.

[0167] In some optional embodiments of the present application, as shown in FIGS. 13 to 16, the electrode core 500 is formed in a cylindrical shape. The minimum value of the radial interval between the outer edge of the annular welding region 5141 and the outer peripheral wall of the electrode core 500 is d2, the radius of the electrode core 500 is R, and the value range of d2 is 4 mm ≤ d2 < R. Thus, the size of the annular welding region 5141 can be controlled, facilitating subsequent welding between another component and the annular welding region 5141, and enabling an easy welding connection between the electrode core 500 and another component.

[0168] Specifically, the radial intervals between the outer edge at different positions of the annular welding region 5141 and the outer peripheral wall of the electrode core 500 may be different. As a result, the minimum value of the radial interval between the outer edge of the annular welding region 5141 and the outer peripheral wall of the electrode core  500 is made greater than 4 mm, thereby sufficiently controlling the size of the annular welding region 5141 and avoiding the influence of an overly large annular welding region 5141 on the coating effect of the thermal shrinkage insulating film 30 on the electrode core 500.

[0169] In some embodiments, the annular welding region 5141 is formed in a ring shape and the annular welding region 5141 is arranged coaxially with the electrode core 500. In this case, the radial intervals between the annular welding region 5141 and the outer peripheral wall of the electrode core 500 at different positions are the same, and the radial interval between the annular welding region 5141 and the outer peripheral wall of the electrode core 500 is d2.

[0170] In some embodiments, as shown in Figures 13 to 16, the minimum radial distance between the outer edge of the cover plate 44 and the outer peripheral wall of the electrode core 500 is d1, the distance between the first end face 513 of the electrode core 500 where the first tab 501 is located and the surface of the separator 45 away from the first current collector plate 200 is w, and the radial length of the area of ​​the separator 45 covered by the heat-shrinkable insulating film 30 is x1. An annular welded area 5141 is provided on the second end face 514 of the second tab 502. The minimum radial distance between the annular welded area 5141 and the outer peripheral wall of the electrode core 500 is d2. The length of the heat-shrinkable insulating film 30 is h1, and the length of the electrode core 500 is h2 (i.e., the height of the electrode core in the first direction). The range of values ​​for h1 is w + x1

[0171] ​Specifically, when the heat-shrinkable insulating film 30 is heated to the glass transition temperature of the heat-shrinkable insulating film 30 to stretch the heat-shrinkable insulating film 30, the stretching length may be selected based on the value range of h1 so as to meet the actual assembly requirements. In addition, the length of the heat-shrinkable insulating film 30 can be adjusted within a relatively wide range, which helps to reduce costs and improve the covering efficiency of the heat-shrinkable insulating film 30.

[0172] In some embodiments, the radial length of the region of the separator 45 covered by the heat-shrinkable insulating film 30 is x1, the minimum value of the radial distance between the outer edge of the cover plate 44 and the outer peripheral wall of the electrode core 500 is d1, and 0 < x < d1, thereby avoiding the heat-shrinkable insulating film 30 from contacting the cover plate 44 or covering the cover plate 44. Specifically, the periphery of the cover plate 44 is welded to the housing 600 of the battery cell 1000, and as a result, the distance between the heat-shrinkable insulating film 30 and the cover plate 44 is maintained, thereby avoiding the heat-shrinkable insulating film 30 from affecting the welding between the cover plate 44 and the housing 600 of the battery cell 1000.

[0173] In some embodiments, the radial length of the region of the second end face 514 covered by the heat-shrinkable insulating film 30 is x2, the minimum value of the radial distance between the outer edge of the annular welding region 5141 and the outer peripheral wall of the electrode core 500 is d2, and x2 < d2, thereby avoiding the heat-shrinkable insulating film 30 from contacting the annular welding region 5141 or covering the annular welding region 5141. Specifically, the annular welding region 5141 is welded to the housing 600 or the bottom cover of the battery cell 1000, and as a result, the distance between the heat-shrinkable insulating film 30 and the annular welding region 5141 is maintained, thereby avoiding the heat-shrinkable insulating film 30 from affecting the welding between the annular welding region 5141 and the housing 600 or the bottom cover of the battery cell 1000.

[0174] In some optional embodiments of the present application, as shown in FIGS. 17 to 27, the second current collector plate 100 according to an embodiment of the present application includes a first connection region 120 and a second connection region 130.

[0175] In some embodiments, as shown in Figure 17, the first connection region 120 includes an intermediate portion 122 and a plurality of first connection portions 121, the plurality of first connection portions 121 arranged continuously in the circumferential direction of the intermediate portion 122, individually connected to the intermediate portion 122, and electrically connected to the electrode core 500. In this specification, in order to increase the connection area between the first connection region 120 and the electrode core 500, i.e., to increase the connection area between the second current collector plate 100 and the electrode core 500, all of the plurality of first connection portions 121 are electrically connected to the electrode core 500, thereby helping to improve the current flow capability of the second current collector plate 100. The second connection region 130 includes a second connection portion 131.

[0176] In the description of this application, unless otherwise specified, “multiple” means two or more.

[0177] It should be noted that the multiple first connection portions 121 are arranged continuously in the circumferential direction of the intermediate portion 122. On the one hand, it is ensured that all of the multiple first connection portions 121 are connectable to the intermediate portion 122. In this case, the intermediate portion 122 and the multiple first connection portions 121 support each other, thereby ensuring the structural stability of the first connection region 120, and thereby facilitating connection to the electrode core 500 by using the first connection portions 121 and reducing the difficulty of connection. On the other hand, the circumferential space of the intermediate portion 122 can be used more appropriately, thereby increasing the area of ​​the first connection portions 121, and further increasing the connection area between the first connection portions 121 and the electrode core 500, thereby improving the current flow capability of the second current collector plate 100.

[0178] As shown in Figures 17 to 27, the second connection portion 131 is located on the side of the first connection region 120, the second connection portion 131 is electrically connected to the intermediate portion 122, there is a height difference between the first connection region 120 and the second connection portion 131, the first connection region 120 and the second connection portion 131 are relatively movable, and the second connection portion 131 is electrically connected to the bottom cover 300. It can be understood herein that the second connection portion 131 is electrically connected to both the intermediate portion 122 and the bottom cover 300 to realize an electrical connection between the second connection portion 131 and the first connection portion 121, thereby helping to realize an electrical connection between the electrode core 500 and the bottom cover 300 by using the second current collector plate 100.

[0179] In some embodiments, the second connection portion 131 is positioned on the side of the first connection area 120, which can increase the area of ​​the second connection portion 131 and further increase the connection area between the second connection portion 131 and the bottom cover 300, thereby achieving a stable connection between the second current collector plate 100 and the bottom cover 300.

[0180] In addition, the second connection portion 131 is positioned on the side of the first connection region 120, thereby preventing the first connection region 120 from occupying the circumferential space of the second connection portion 131, and preventing the second connection portion 131 from occupying the circumferential space of the first connection region 120. In this way, there is sufficient space to position the first connection region 120 and the second connection portion 131, which helps to increase the area of ​​the first connection portion 121 and the second connection portion 131, thereby increasing the connection area between the first connection portion 121 and the electrode core 500, and increasing the connection area between the second connection portion 131 and the bottom cover 300.

[0181] It should be noted in this application that the first connection area 120 and the second connection portion 131 have a height difference and are relatively movable. In this specification, the height difference may be understood as the first connection area 120 and the second connection portion 131 being spaced apart from each other in the height direction of the battery cell 1000, that is, the arrangement heights of the first connection area 120 and the second connection portion 131 in the battery cell 1000 being different. "Relatively movable" may be understood as the first connection area 120 being movable relative to the second connection portion 131, or the second connection portion 131 being movable relative to the first connection area 120, or the first connection area 120 and the second connection portion 131 being movable relative to each other. Such a setting can reduce the space occupied by the second current collector plate 100 in the height direction. Thus, when a second current collector plate 100 is used to connect the electrode core 500 and the bottom cover 300, the height of the space secured between the electrode core 500 and the bottom cover 300 can be reduced, resulting in sufficient space for positioning the electrode core 500. In other words, the height of the electrode core 500 may be increased, thereby improving the capacity of the electrode core 500 and further improving the capacity of the battery cell 1000. It should be noted that, as a conductive element, the second current collector plate 100 is generally made from a metallic conductive material such as copper, aluminum, or iron, which has properties such as elasticity and deformability. In this case, the height difference set between the first connection area 120 and the second connection portion 131 allows the positions of the first connection area 120 and the second connection portion 131 to change under the action of an external force. That is, when the bottom cover 300 is attached, the bottom cover 300 presses against the second connection portion 131 of the second current collector plate 100, and as a result, the first connection area 120 and the second connection portion 131 become movable relative to each other.

[0182] In addition, the electrode core 500 is directly connected to the bottom cover 300 through the cooperation of the first connection region 120 and the second connection portion 131, which have a difference in height. Bending of the second current collector plate 100 can be avoided during the connection process, thereby reducing the bending process and improving assembly efficiency. In addition, stress concentration caused by bending of the second current collector plate 100 can be avoided, preventing the failure of the second current collector plate 100 and extending its service life.

[0183] Since the first connection area 120 and the second connection portion 131 are arranged to be movable relative to each other, in the process of connecting the second current collector plate 100 to the bottom cover 300, welding gaps between the second current collector plate 100 and the bottom cover 300 caused by changes in the positions of the bottom cover 300 and the electrode core 500 can be avoided. Furthermore, welding gaps between the second current collector plate 100 and the bottom cover 300 caused by significant differences in the flatness of multiple welding locations on the bottom cover 300, or significant differences in the flatness of the second connection portion 131, can also be avoided. This reduces the possibility of welding defects between the second current collector plate 100 and the bottom cover 300 and ensures the yield of the battery cells 1000.

[0184] Specifically, if the flatness of the connection surface of the bottom cover 300 that engages with the second connection portion 131 is high, the relative position of the second connection portion 131 and the first connection portion 121 is adaptively adjusted by the second connection portion 131 based on the flatness of the bottom cover 300, thereby further improving the connection strength between the second connection portion 131 and the bottom cover 300 and ensuring the alignment of the opposing contact surfaces between the second connection portion 131 and the bottom cover 300.

[0185] This may also be understood as, in this application, when the second current collector plate 100 is connected to the bottom cover 300, the second current collector plate 100 absorbs manufacturing errors of the bottom cover 300 by using the second connection portion 131, thereby improving the manufacturing accuracy of the battery cell 1000.

[0186] In other words, in this application, the first connection area 120 and the second connection portion 131 are arranged to be relatively movable. In this way, in the process of connecting the second current collector plate 100, the gap between the second current collector plate 100 and the bottom cover 300 can be effectively avoided, thereby eliminating the effects caused by assembly or manufacturing errors, further improving the connection strength between the second current collector plate 100 and the bottom cover 300, reducing the possibility of welding defects, and ensuring the alignment of the opposing contact surfaces between the second current collector plate 100 and the bottom cover 300 to guarantee the yield of the battery cells 1000.

[0187] In a specific example, since the first connection area 120 and the second connection part 131 have a height difference and are movable relative to each other, when the bottom cover 300 is connected to the electrode core 500 by using the second current collector plate 100, the first connection area 120 may be connected to the electrode core 500 first. In the height direction of the battery cell 1000, since there is a height difference between the first connection area 120 and the second connection part 131, in the step of attaching the bottom cover 300 after the first connection area 120 has been connected to the electrode core 500, the second connection part 131 may be positioned close to the bottom cover 300 to reduce the difficulty of connecting the second connection part 131 and the bottom cover 300. In addition, since the first connection area 120 and the second connection portion 131 are movable relative to each other, in this case, when the second connection portion 131 is connected to the bottom cover 300, it can be guaranteed that the position of the second connection portion 131 can change based on the position, shape, surface structure, etc. of the bottom cover 300. As a result, the second connection portion 131 is effectively connected to the bottom cover 300, ensuring connection strength and connection area. By using the second current collector plate 100, the bottom cover 300 is connected to the electrode core 500, reducing the possibility of welding defects between the second current collector plate 100 and the bottom cover 300, and ensuring the yield of the battery cells 1000.

[0188] The connection between the first connection area 120 and the electrode core 500, and the connection between the second connection part 131 and the bottom cover 300, may both be achieved by welding, joining, or the like.

[0189] From the above-described structure, in the second current collector plate 100 in this embodiment of the present application, the second current collector plate 100 is arranged to include a first connection region 120 and a second connection portion 131, and as a result, the first connection region 120 and the second connection portion 131 can cooperate with each other to learn to electrically connect the electrode core 500 to the bottom cover 300.

[0190] The first connection region 120 is arranged to include an intermediate portion 122 and a plurality of first connection portions 121, thereby supporting the plurality of first connection portions 121 by using the intermediate portion 122 and improving the positional stability of the plurality of first connection portions 121. In this way, the cooperation between the plurality of first connection portions 121 can facilitate the electrical connection between the first connection region 120 and the electrode core 500. In addition, when the first connection region 120 is connected to the electrode core 500, the connection area between the first connection region 120 and the electrode core 500 can be increased, i.e., the connection area between the second current collector plate 100 and the electrode core 500 can be increased. On the one hand, the connection strength between the second current collector plate 100 and the electrode core 500 is improved, and as a result the position of the second current collector plate 100 and the electrode core 500 becomes relatively stable, improving the positional stability of the second current collector plate 100. On the other hand, it can be further guaranteed that the second current collector plate 100 has a relatively large current flow area, thereby avoiding insufficient current flow to the electrode core 500 due to a small current flow area of ​​the second current collector plate 100, thereby avoiding the problem of excessive heat generation of the electrode core 500, extending the service life of the electrode core 500, and improving the safety of use of the electrode core 500.

[0191] The second connection portion 131 is positioned on the side of the first connection area 120, thereby ensuring the area of ​​the second connection portion 131. In this way, when the second connection portion 131 is connected to the bottom cover 300, the connection area between the second connection portion 131 and the bottom cover 300 may be increased, that is, the connection area between the second current collector plate 100 and the bottom cover 300 is increased, as a result the connection strength between the second current collector plate 100 and the bottom cover 300 is improved, the position of the second current collector plate 100 and the bottom cover 300 becomes relatively stable, and thereby further improves the positional stability of the second current collector plate 100.

[0192] In other words, the second current collector plate 100 in this application can be stably connected to the electrode core 500 and the bottom cover 300.

[0193] In addition, in this application, the first connection region 120 and the second connection portion 131 are arranged to have a difference in height. Thus, the second current collector plate 100 may have a specific height, thereby enabling electrical connection between the electrode core 500 and the bottom cover 300 by using the second current collector plate 100, avoiding the height increase caused by bending the second current collector plate 100, thereby reducing the bending process, improving the connection efficiency between the electrode core 500 and the bottom cover 300, avoiding damage to the second current collector plate 100, avoiding stress concentration caused by bending the second current collector plate 100, extending the service life of the second current collector plate 100, and improving the structural strength of the second current collector plate 100.

[0194] In addition, in this application, the first connection region 120 and the second connection portion 131 are further arranged to be relatively movable, thereby reducing the space occupied by the second current collector plate 100 in the height direction, and thereby reducing the height of the space secured between the electrode core 500 and the bottom cover 300. In this way, the height of the electrode core 500 may be made correspondingly higher, thereby improving the capacity of the electrode core 500, i.e., improving the capacity of the battery cell 1000. In other words, in this application, the relative position between the first connection region 120 and the second connection portion 131 is creatively set, thereby electrically connecting the electrode core 500 to the bottom cover 300 by using the second current collector plate 100 without bending the structure of the second current collector plate 100, thereby improving connection efficiency, preventing damage to the second current collector plate 100, extending the service life of the second current collector plate 100, improving the structural strength of the second current collector plate 100, reducing the difficulty of manufacturing the second current collector plate 100, reducing the height of the second current collector plate 100, and increasing the capacity of the electrode core 500.

[0195] In addition, the first connection region 120 and the second connection portion 131 are arranged to be relatively movable, so that the height difference between the first connection region 120 and the second connection portion 131 can be adjusted, that is, the height of the second current collector plate 100 can be adjusted, thereby expanding the range of application of the second current collector plate 100 and allowing the second current collector plate 100 in this application to be applied to battery cells 1000 of various sizes. In addition, since the height of the second current collector plate 100 is adjustable, the height of the second current collector plate 100 can be adjusted based on the position and structure of the bottom cover 300, thereby avoiding a gap between the second current collector plate 100 and the bottom cover 300, thereby eliminating the effects caused by assembly or manufacturing errors, improving the connection strength between the second current collector plate 100 and the bottom cover 300, ensuring the alignment of the opposing contact surfaces between the second current collector plate 100 and the bottom cover 300, thereby reducing the possibility of welding defects and subsequently ensuring the yield of the battery cells 1000.

[0196] In conclusion, the second current collector plate 100 in this application has a small footprint, a stable structure, high structural strength, a long service life, low manufacturing difficulty, a wide range of applications, and strong current flow capability.

[0197] Compared to related technologies, the second current collector plate 100 in this application can be seen as having a smaller footprint and being less prone to damage. In addition to achieving an electrical connection between the electrode core 500 and the bottom cover 300, the capacitance of the electrode core 500 may be further increased, and the current flow area may be large enough to protect the electrode core 500. Furthermore, the possibility of welding defects between the second current collector plate 100 and the bottom cover 300 may be reduced.

[0198] Optionally, the material of the second current collector plate 100 may be an aluminum alloy, pure copper, nickel-plated copper, etc. As a result, the second current collector plate 100 has a conductive function, and consequently, by using the second current collector plate 100, the electrode core 500 is electrically connected to the bottom cover 300.

[0199] In some examples, the electrode core 500 includes tabs, and a plurality of first connectors 121 are electrically connected to the tabs, thereby electrically connecting the second current collector plate 100 to the electrode core 500.

[0200] It should be noted that the tabs in this specification may be a full-tab structure processed by knurling or flattening, or a multi-tab structure processed by laser ablation or die-cutting.

[0201] In some embodiments, when the material of the second current collector plate 100 is an aluminum alloy, the second current collector plate 100 is primarily mated and connected to the positive electrode tab of the electrode core 500. When the material of the second current collector plate 100 is pure copper or nickel-plated copper, the second current collector plate 100 is primarily mated and connected to the negative electrode tab of the electrode core 500. That is, a person skilled in the art may select the material of the second current collector plate 100 based on the application environment of the second current collector plate 100. This is not particularly limited in this application.

[0202] In the description of this application, the features defined by “first” and “second” may include one or more such features, either explicitly or implicitly, and are used to distinguish and describe features rather than to indicate order or importance.

[0203] In some examples, the second connection portion 131 extends circumferentially over the first connection region 120. The area of ​​the second connection portion 131 may be maximized, in which case the connection area between the second connection portion 131 and the bottom cover 300 is increased, thereby achieving a stable connection between the second current collector plate 100 and the bottom cover 300.

[0204] In some embodiments of this application, the second current collector plate 100 is an integrally formed member. That is, the entire second current collector plate 100 is manufactured using a unibody process, thereby reducing the difficulty of manufacturing the second current collector plate 100, improving manufacturing efficiency, ensuring connection strength and quality between the intermediate portion 122, the first connection portion 121, and the second connection portion 131, stabilizing the structure of the second current collector plate 100, and electrically connecting the electrode core 500 to the bottom cover 300 by using the second current collector plate 100.

[0205] It should be noted that in the process of manufacturing the second current collector plate 100, the second current collector plate 100 may be cut to form structures such as an intermediate portion 122, a first connecting portion 121, and a second connecting portion 131 on the second current collector plate 100.

[0206] In some embodiments of this application, the second connector 131 is formed as a ring structure, as shown in Figures 17 and 18. In the radial direction of the second connector 131, it is located radially outward from the first connection region 120. In some embodiments, the ring structure may facilitate setting the second connector 131 to extend circumferentially over the first connection region 120, thereby ensuring the area of ​​the second connector 131. In addition, the ring structure may further increase the structural strength of the second connector 131 and extend its service life.

[0207] In addition, the second connecting portion 131 is formed in a ring structure, which results in the second connecting portion 131 forming an integrated part, thereby facilitating the processing of the second connecting portion 131 and reducing the difficulty of manufacturing the second connecting portion 131.

[0208] In addition, the second connecting portion 131 is arranged to form a ring structure. In the process of connecting the second connecting portion 131 to the bottom cover 300, the entire ring of the second connecting portion 131 can be connected to the bottom cover 300, eliminating the need for a separate correction mechanism, thereby reducing the difficulty of connecting the second connecting portion 131 to the bottom cover 300.

[0209] In other words, in this application, the second connecting portion 131 is arranged as an annular structure, which allows the second connecting portion 131 to have a large connection area, thereby improving the structural strength of the second connecting portion 131, extending the service life of the second connecting portion 131, reducing the difficulty of manufacturing the second connecting portion 131, and reducing the difficulty of connecting the second connecting portion 131 and the bottom cover 300.

[0210] In a specific example, the second connector 131 is formed in the shape of an annular plate, which is made of aluminum, copper, or another conductive material to electrically connect the second connector 131 to the bottom cover 300.

[0211] In addition, the second connection portion 131 is positioned radially outward of the first connection area 120, so that the second connection portion 131 and the first connection area 120 can be spaced apart from each other radially from the second connection portion 131, and the second connection portion 131 and the first connection area 120 can be properly positioned. It is ensured that the second connection portion 131 can be connected to the bottom cover 300 and the first connection area 120 can be connected to the electrode core 500, and the connection area between the second connection portion 131 and the first connection area 120 is further ensured, thereby ensuring the connection area between the second current collector plate 100 and the electrode core 500 and the bottom cover 300, and ensuring the connection strength.

[0212] In some examples, the inner diameter of the second connection portion 131 is larger than the outer diameter of the first connection region 120, and as a result, the second connection portion 131 is positioned radially outward of the first connection region 120, thereby increasing the area of ​​both the first connection portion 121 and the second connection portion 131.

[0213] Optionally, as shown in Figures 17 to 19, the inner wall of the second connection portion 131 is connected to the intermediate portion 122 via the connecting member 140. The inner wall of the second connection portion 131 as described herein may be understood as the peripheral wall of the second connection portion 131 and the peripheral wall close to the first connection region 120, thereby realizing a connection between the second connection portion 131 and the intermediate portion 122, i.e., a fixed connection between the second connection portion 131 and the first connection region 120. In this way, after the second connection portion 131 is connected to the bottom cover 300 and the first connection region 120 is connected to the electrode core 500, an electrical connection between the bottom cover 300 and the electrode core 500 can be realized.

[0214] It should be noted that the connecting member 140 is positioned to fix the second connecting portion 131 to the first connecting region 120, further reducing the difficulty of connecting the second connecting portion 131 and the first connecting region 120, thereby improving connection efficiency.

[0215] In a specific example, when the second current collector plate 100 is manufactured, the structure between the second connection portion 131 and the intermediate portion 122 is cut to form a connecting member 140, and the connecting member 140 may then be bent, thereby reducing the difficulty of molding the second current collector plate 100 and improving the connection strength between the connecting member 140 and both the second connection portion 131 and the intermediate portion 122.

[0216] In some embodiments of this application, the first connector 121 has a first surface that connects to the electrode core 500, and the second connector 131 has a second surface that connects to the bottom cover 300, with the first surface being parallel to the second surface. In this specification, it may be understood that the first connector 121 has a first surface and is connected to the electrode core 500 by using the first surface, thereby electrically connecting the first connector 121 to the electrode core 500; similarly, the second connector 131 has a second surface and is connected to the bottom cover 300 by using the second surface, thereby electrically connecting the second connector 131 to the bottom cover 300. Thus, the electrode core 500 is electrically connected to the bottom cover 300 by using the second current collector plate 100.

[0217] In the process of assembling the battery cell 1000, the side of the electrode core 500 that faces the bottom cover 300 is usually parallel to the side of the bottom cover 300 that faces the electrode core 500. Therefore, in this application, the first surface is arranged parallel to the second surface, so that the second surface can be effectively connected to the bottom cover 300 after the first surface has been connected to the electrode core 500. This ensures the connection area between the first connection area 120 and the electrode core 500, and the connection area between the second connection area 131 and the bottom cover 300, thereby effectively electrically connecting the electrode core 500 to the bottom cover 300 and reducing the difficulty of connection.

[0218] In some examples, the surface of the first connection portion 121 that faces the electrode core 500 is defined as the first surface in order to facilitate interconnection between the first surface and the electrode core 500, and similarly, the surface of the second connection portion 131 that faces the bottom cover 300 is defined as the second surface in order to facilitate interconnection between the second surface and the bottom cover 300.

[0219] In some embodiments of this application, as shown in Figures 17 to 27, the second current collector plate 100 further includes a connecting member 140, which is connected between the second connection portion 131 and the intermediate portion 122, and the connecting member 140 extends inclined relative to the first connection portion 121, resulting in a height difference between the first connection region 120 and the second connection portion 131. That is, when the inclined connecting member 140 is positioned to connect the second connection portion 131 and the intermediate portion 122, it can be ensured that a height difference exists between the first connection region 120 and the second connection portion 131. This helps to reduce the difficulty of molding the second current collector plate 100 and to achieve an electrical connection between the electrode core 500 and the bottom cover 300 by using the second current collector plate 100.

[0220] By option, the connecting member 140 is a plate body. If the plate body extends inclined with respect to the first connecting portion 121, it can be ensured that the connecting member 140 can move and / or deform relative to the first connecting portion 121 under the action of an external force, thereby ensuring relative movement between the first connecting region 120 and the second connecting portion 131, thereby changing the height of the second current collector plate 100 and expanding the usable range of the second current collector plate 100.

[0221] Movement and / or deformation as used herein may be understood to mean that the connecting member 140 is constructed to be movable relative to the first connection portion 121, or that the connecting member 140 is constructed to be deformable relative to the first connection portion 121, or that the connecting member 140 is constructed to be movable relative to the first connection portion 121 and deformable relative to the first connection portion 121, thereby allowing the height difference between the first connection portion 121 and the second connection portion 131 to be changed by using the connecting member 140, thereby allowing the first connection region 120 and the second connection portion 131 to be movable relative to each other, and thereby adjusting the position of the second connection portion 131 relative to the first connection portion 121, i.e., adjusting the relative positions of the second connection portion 131 and the bottom cover 300. The second current collector plate 100 as a conductive element is generally made from a metallic conductive material such as copper, aluminum, or iron, which has properties such as elasticity and deformability in nature. In this case, the connecting member 140 is constructed as an inclined and extending plate body to enable movement and / or deformation of the second connecting portion 131 and to enable an adjustable position of the second connecting portion 131.

[0222] In a specific example, the connecting member 140 is formed in the shape of a rectangular plate, and by using the connecting member 140, the second connecting portion 131 is fixed to the intermediate portion 122, ensuring that after the connection is completed, the second connecting portion 131 can be positioned radially outward of the first connection area 120, and ensuring that the second connecting portion 131 can act on the connecting member 140 under the action of external forces.

[0223] Naturally, in some other examples, the connecting member 140 may be formed as a rectangular plate, a fan-shaped plate, or the like, as an alternative. This is not particularly limited in this application.

[0224] In a specific example, since the connecting member 140 can move and / or deform relative to the first connecting portion 121, if the second current collector plate 100 is individually connected to the electrode core 500 and the bottom cover 300, if the bottom cover 300 has a manufacturing tolerance, the welded portion protruding toward the electrode core 500 will generate a force that moves the corresponding second connecting portion 131 toward the electrode core 500. The second connection portion 131 is connected to the first connection portion 121 by using an inclined and extending plate body, and since the inclined and extending plate body can easily change position or deform under the action of an external force, when the bottom cover 300 moves the corresponding second connection portion 131 toward the electrode core 500, the second connection portion 131 acts upon the inclined and extending plate body, thereby ensuring that the second connection portion 131 can move effectively, that is, ensuring that the position of the second connection portion 131 can change based on the position of the bottom cover 300, and as a result the second connection portion 131 can be connected to the bottom cover 300, and a fitting gap between the second connection portion 131 and the bottom cover 300 can be avoided, thereby ensuring the alignment of the opposing contact surfaces between the second current collector plate 100 and the bottom cover 300 and reducing the possibility of welding defects.

[0225] It should be noted that the second connecting portion 131 is capable of acting on the inclined and extending plate body. The specific action of the plate body may be as follows: The second connecting portion 131 moves one end of the plate body connected thereto toward the electrode core 500, and in the process of moving one end of the plate body, the other end of the plate body is fixed toward the electrode core 500, and as a result the entire plate body rotates toward the electrode core 500, thereby achieving relative movement of the connecting member 140 with respect to the first connecting portion 121; or, the second connecting portion 131 may bend one end of the plate body connected thereto toward the electrode core 500, and in the process of bending, the other end of the plate body may be fixed toward the electrode core 500, thereby achieving relative deformation of the connecting member 140 with respect to the first connecting portion 121.

[0226] Figure 21 is a schematic diagram of the second connection point 131 before and after movement. Specifically, the solid line represents the position of the second connection point 131 before movement, and the dashed line represents the position of the second connection point 131 after movement.

[0227] Optionally, the connecting member 140 is made from a conductive material such as aluminum or copper. When the first connection region 120 is connected to the second connection portion 131 by using the connecting member 140, it is ensured that, under the action of an external force, the second connection portion 131 can effectively act on the inclined and extending connecting member 140, that is, the connecting member 140 can effectively move and / or deform relative to the first connection region 120, thereby changing the height difference between the first connection region 120 and the second connection portion 131.

[0228] It should be noted that the specific length, width, and thickness of the connecting member 140 are not limited in this application, provided that it is ensured that the connecting member 140 can effectively connect the first connection area 120 to the second connection portion 131, and that the second connection portion 131 can effectively operate the inclined connecting member 140 under the action of external forces.

[0229] Naturally, in some other examples, the connecting member 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. Thus, the connecting member 140 may be constructed to be movable relative to the first connecting region 120 and / or deformable relative to the first connecting region 120, thereby changing the height difference between the first connecting region 120 and the second connecting portion 131.

[0230] In a specific example, if the connecting member 140 is a buffer spring, and the second current collector plate 100 is individually connected to the electrode core 500 and the bottom cover 300, if the flatness of multiple welds on the bottom cover 300 differs significantly, the welds protruding toward the electrode core 500 generate a force that moves the corresponding second connecting portion 131 toward the electrode core 500, causing the second connecting portion 131 to compress the buffer spring, deform the buffer spring, and thereby change the height difference between the first connection region 120 and the second connecting portion 131.

[0231] In some examples, as shown in Figure 19, the range of values ​​for the inclination angle a between the connecting member 140 and the first plane is 5° ≤ α < 90°, and the first plane is perpendicular to the thickness direction of the second current collector plate 100. The thickness direction of the second current collector plate 100 as described herein may also be understood as the height direction of the battery cell 1000. Therefore, the first plane may also be understood as perpendicular to the height direction of the battery cell 1000.

[0232] It should be noted that if the inclination angle a between the connecting member 140 and the first plane is less than 5°, the overall height of the second current collector plate 100 will be reduced, resulting in the problem that the electrode core 500 cannot be effectively electrically connected to the bottom cover 300 by using the second current collector plate 100. If the inclination angle a between the connecting member 140 and the first plane is 90° or more, on the one hand, the overall height of the second current collector plate 100 will be increased, causing the second current collector plate 100 to occupy a large space and occupy the space for the electrode core 500, reducing the capacity of the electrode core 500. On the other hand, the connecting member 140 will not be able to effectively move the second connection portion 131, that is, the connecting member 140 will not be able to effectively change the height difference between the first connection area 120 and the second connection portion 131, and the problem of welding defects caused by manufacturing errors will not be resolved.

[0233] Therefore, in this application, the range of the inclination angle a between the connecting member 140 and the first plane is set to 5° ≤ a < 90°. In this way, the capacity of the electrode core 500 is ensured by ensuring that the electrode core 500 can be effectively electrically connected to the bottom cover 300 by using the second current collector plate 100, by ensuring that the height difference between the first connection area 120 and the second connection part 131 can be more effectively changed by using the connecting member 140, and by ensuring that the overall height of the second current collector plate 100 does not become excessively high.

[0234] In specific examples, the inclination angle a between the connecting member 140 and the first plane may be 5°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, etc. Optionally, the height range between the first connecting region 120 and the second connecting portion 131 is 1mm to 10mm. In some embodiments, the specific height values ​​of the first connecting region 120 and the second connecting portion 131 may be adjusted based on the inclination angle a between the connecting member 140 and the first plane. To ensure that the inclination angle a between the connecting member 140 and the first plane can be within the range of 5° to 90°, the height range between the first connecting region 120 and the second connecting portion 131 is set to 1mm to 10mm. Therefore, by using the connecting member 140, it is ensured that the height difference between the first connection area 120 and the second connection part 131 can be effectively changed, and furthermore, the overall height of the second current collector plate 100 is prevented from becoming excessively high, thereby ensuring the capacity of the electrode core 500.

[0235] In a specific example, the height between the first connection area 120 and the second connection part 131 may be 1 mm, 3 mm, 5 mm, 8 mm, 10 mm, etc.

[0236] It should be noted that the height between the first connection area 120 and the second connection portion 131 may be understood as the distance between the faces of the second connection portion 131 and the face of the first connection portion 121, which face each other in the height direction of the battery cell 1000.

[0237] By choice, as shown in Figures 17 to 23, in the first plane, the orthographic projection of the outer wall of the second current collector plate 100 lies on a circle, and the first plane is perpendicular to the thickness direction of the second current collector plate 100. That is, the orthographic projection of the outer wall of the second current collector plate 100 in a plane perpendicular to the thickness direction of the second current collector plate 100 lies on a circle, and as a result, the shape of the second current collector plate 100 is similar to a circular shape. The circular shape allows the shape of the second current collector plate 100 to be adapted to the shape of the electrode core 500 and the bottom cover 300, thereby reducing the difficulty of connecting the second current collector plate 100 to the electrode core 500 and the bottom cover 300 and increasing the connection area to ensure connection quality.

[0238] In a specific example, referring to Figures 17 to 23, the intermediate portion 122 forms a circular support plate, and all of the multiple first connecting portions 121 are formed as fan-shaped connecting plates. The multiple first connecting portions 121 are connected to the radially outer side of the intermediate portion 122 and are spaced apart from each other in the circumferential direction of the intermediate portion 122. In this way, after the multiple first connecting portions 121 are connected to the intermediate portion 122, the first connection region 120 may be formed in a circular shape, and the second connecting portion 131 is formed in a ring structure and is located radially outside the first connection region 120, so that the shape of the second current collector plate 100 is similar to a circular shape.

[0239] In some embodiments, referring to Figures 17 to 23, the first connection region 120 includes an intermediate section 122 and a plurality of first connection sections 121. The intermediate section 122 is formed from a circular aluminum plate or a circular copper plate. The first connection sections 121 are formed from a fan-shaped aluminum plate or a fan-shaped copper plate. The plurality of first connection sections 121 surround the intermediate section 122, are individually connected to the intermediate section 122, and are spaced apart. A connecting member 140, formed from a rectangular aluminum plate or a rectangular copper plate, is positioned between two adjacent first connection sections 121, and the connecting member 140 and the first connection sections 121 are spaced apart in the circumferential direction of the first connection region 120. The first end of the connecting member 140 and the radial end of the first connection region 120 are connected to the intermediate section 122.

[0240] Referring to Figures 17 to 23, the second connecting portion 131 is formed from an annular aluminum plate or an annular copper plate. The second connecting portion 131 surrounds the periphery of the first connecting region 120. The second end of the connecting member 140 and the second radial end of the first connecting region 120 are connected to the second connecting portion 131. In addition, the connecting member 140 extends inclined relative to the first connecting region 120, and as a result, the first connecting region 120 and the second connecting region 130 are spaced apart in the height direction of the battery cell 1000.

[0241] In a specific example, when the second current collector plate 100 is individually connected to the electrode core 500 and the bottom cover 300, the first connection area 120 is first connected to the electrode core 500. 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 bottom cover 300 can effectively contact and fit with the second connection area 131 during the process of installing the bottom cover 300. In addition, in the process of connecting the bottom cover 300 to the second connection portion 131, if there is a welded portion on the bottom cover 300 that protrudes toward the electrode core 500, the welded portion moves the second connection portion 131 toward the electrode core 500, and the second connection portion 131 rotates the second end of the connecting member 140 toward the electrode core 500 around the first end, or bends the second end of the connecting member 140 toward the electrode core 500. As a result, the bottom cover 300 moves and / or deforms the connecting member 140 relative to the first connection region 120, thereby changing the height of the second current collector plate 100, enabling the second current collector plate 100 to be effectively connected to the bottom cover 300, ensuring alignment of the opposing contact surfaces of the second current collector plate 100 and the bottom cover 300, and reducing the possibility of welding defects.

[0242] Depending on the choice, there may be multiple connecting members 140, as shown in Figures 17 to 23. In the circumferential direction of the first connection region 120, the multiple first connecting portions 121 and the multiple connecting members 140 are spaced apart and alternately arranged. In some embodiments, the shape of the second current collector plate 100 is similar to a circular shape. Therefore, "in the circumferential direction of the first connection region 120" as described herein may be understood to mean that the multiple first connecting portions 121 and the multiple connecting members 140 are spaced apart and alternately arranged in the circumferential direction of the second current collector plate 100. "Spaced apart and alternately arranged" means that one connecting member 140 is placed between two adjacent first connecting portions 121, and correspondingly, one first connecting portion 121 is placed between two adjacent connecting members 140. With the above-described configuration, the space of the second current collector plate 100 can be used appropriately, and as a result, multiple first connection portions 121 and multiple connecting members 140 can be arranged simultaneously on the same second current collector plate 100, thereby ensuring that the current flow area of ​​the second current collector plate 100 can be increased by using multiple first connection portions 121, and that the second connection portion 131 can be connected to the intermediate portion 122 by using the connecting members 140.

[0243] In some examples, as shown in Figures 17 to 23, a plurality of first connection portions 121 are spaced apart in the circumferential direction of the second current collector plate 100, and a connecting member 140 is placed between two adjacent first connection portions 121. As a result, the plurality of first connection portions 121 and the plurality of connecting members 140 can be arranged alternately in the circumferential direction of the intermediate portion 122, thereby arranging the plurality of first connection portions 121 and the plurality of connecting members 140 on the second current collector plate 100 simultaneously.

[0244] Optionally, as shown in Figures 17 to 23, the connecting member 140 and the first connecting portion 121 are spaced apart in the circumferential direction of the second current collector plate 100, thereby preventing the first connecting portion 121 from hindering the deformation and / or movement of the connecting member 140, i.e., ensuring that the connecting member 140 can effectively move and / or deform relative to the intermediate portion 122, thereby changing the height difference between the first connecting region 120 and the second connecting portion 131, and thereby eliminating the effects of welding defects caused by manufacturing errors.

[0245] Optionally, the numerical range of the circumferential distance between the first connecting portion 121 and the adjacent connecting member 140 is 0.5 mm to 2 mm. While ensuring that both the first connecting portion 121 and the connecting member 140 have sufficient area, the connecting member 140 and the first connecting portion 121 may be further spaced apart from each other to ensure that the connecting member 140 can move and / or deform effectively relative to the intermediate portion 122.

[0246] In some embodiments of this application, as shown in Figure 18, the inner walls of the first connection portion 121 and the second connection portion 131 are spaced apart to form a spatial gap, the range of values ​​for the radius dimension G1 of the orthographic projection of the spatial gap onto a first plane is 0.5 mm to 2 mm, and the first plane is perpendicular to the thickness direction of the second current collector plate 100. In this specification, the inner walls of the first connection portion 121 and the second connection portion 131 are spaced apart, and a spatial gap is formed between the inner walls of the first connection portion 121 and the second connection portion 131. The radius dimension of the orthographic projection of the spatial gap onto a plane perpendicular to the height direction of the battery cell 1000 is G1, and the range of values ​​for G1 is 0.5 mm to 2 mm. If G1 is less than 0.5 mm, the distance between the first connection part 121 and the second connection part 131 becomes small. In this case, the first connection part 121 and the second connection part 131 do not have a relative position, meaning there is no effective height difference between the first connection part 121 and the second connection part 131, and the relative position does not change, making it impossible to reduce the difficulty of molding and connecting the second current collector plate 100. If G1 exceeds 2 mm, the area of ​​the first connection part 121 and / or the second connection part 131 decreases, meaning the connection area between the first connection part 121 and the electrode core 500, and / or the connection area between the second connection part 131 and the bottom cover 300 decreases. As a result, the current flow capability of the second current collector plate 100 becomes insufficient, and the positional stability of the second current collector plate 100 after connection cannot be guaranteed.

[0247] Therefore, in this application, the radius dimension G1 of the orthographic projection of the spatial gap formed by separating the first connection portion 121 from the inner peripheral wall of the second connection portion 131, and the orthographic projection onto a plane perpendicular to the height direction of the battery cell 1000, is set to 0.5 mm to 2 mm, thereby ensuring an effective height difference between the first connection portion 121 and the second connection portion 131, and further ensuring the area of ​​the first connection portion 121 and the second connection portion 131.

[0248] In other words, in this application, the distance between the first connection portion 121 and the second connection portion 131 is set creatively, thereby ensuring that the first connection portion 121 and the second connection portion 131 can be effectively separated, thereby facilitating adjustment of the relative position between the first connection portion 121 and the second connection portion 131, and as a result, the first connection region 120 and the second connection portion 131 can be moved relative to each other. This ensures that an electrical connection between the electrode core 500 and the bottom cover can be achieved without bending the second current collector plate 100, thereby reducing the bending process, improving assembly efficiency, avoiding stress concentration caused by bending the second current collector plate 100, and thereby preventing the breakage of the second current collector plate 100 and extending the service life of the second current collector plate 100. In addition, it can be further ensured that the first connection portion 121 and the second connection portion 131 each have a sufficient connection area, and as a result, the second current collector plate 100 can effectively realize an electrical connection between the electrode core 500 and the bottom cover, thereby improving the operating performance of the battery cell 1000.

[0249] In some specific examples, the radius dimension G1 of the orthographic projection of the spatial gap formed by separating the first connection portion 121 from the inner circumferential wall of the second connection portion 131, and projected onto 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.

[0250] In some examples, as shown in Figures 17 to 23, the distance between the opposing side walls of each first connection portion 121 gradually increases in the direction away from the intermediate portion 122. In this way, the area of ​​the first connection portion 121 is increased, thereby ensuring a sufficient connection area between the first connection portion 121 and the second tab 502. Thus, it is ensured that the second current collector plate 100 has a large current flow area, insufficient current flow in the electrode core 500 caused by a small current flow area of ​​the second current collector plate 100 is avoided, serious overheating problems of the electrode core 500 are avoided, the service life of the electrode core 500 is extended, and the safety of use of the electrode core 500 is improved.

[0251] In some examples, the first connection portion 121 may be formed in a fan shape as shown in Figures 17 to 23. The fan shape allows the spacing between the opposing side walls of the first connection portion 121 to gradually widen in the direction away from the intermediate portion 122, thereby increasing the area of ​​the first connection portion 121.

[0252] Naturally, in some other examples, the first connecting portion 121 may be formed in the shape of a triangle, rectangle, circle, or the like, but this is not limited to the present application.

[0253] In some embodiments of this application, as shown in Figure 18, in a first plane, the orthographic projection of the outer periphery wall of the second current collector plate 100 lies on a circle, the first plane is perpendicular to the thickness direction of the second current collector plate 100, the minimum radius of the outer periphery wall of the second current collector plate 100 is R1, and the range of R1 is 10 mm to 100 mm. In this specification, it can be understood that if the shape of the second current collector plate 100 is similar to a circular shape, the minimum radius of the outer periphery wall of the second current collector plate 100 is R1. The minimum radius may be understood as the radius of the outer periphery wall of the second current collector plate 100 having several different values, the minimum value in this specification being 10 mm to 100 mm, which ensures that the size of the second current collector plate 100 can be adapted to both the electrode core 500 and the bottom cover 300, thereby helping to achieve an electrical connection between the electrode core 500 and the bottom cover 300 by using the second current collector plate 100, and ensuring that the second current collector plate 100 has a sufficient contact area with the electrode core 500 and the bottom cover 300.

[0254] Naturally, in some other examples, the radius of the second current collector plate 100 is not limited to 10 mm to 100 mm. Those skilled in the art may limit the radius of the second current collector plate 100 based on the practical area of ​​the electrode core 500 and the bottom cover 300 in order to ensure a sufficient connection area between the second current collector plate 100 and both the electrode core 500 and the bottom cover 300.

[0255] In a specific example, as shown in FIGS. 17 to 20, a stop protrusion 1313 and a reinforcing portion 1311 are arranged on the radially outer peripheral wall of the second current collector plate 100. The minimum value of the radius of the outer peripheral wall of the second current collector plate 100 may be understood as the radius of the second current collector plate 100 when the stop protrusion 1313 is arranged on the second current collector plate 100.

[0256] Optionally, as shown in FIG. 18, the maximum values r and R1 of the radii of the outer peripheral walls of the first connection region 120 satisfy the following condition: 1 / 2R1 ≤ r < R1. In this specification, the radius of the outer peripheral wall of the first connection region 120 has a plurality of different values.

[0257] In some embodiments, the maximum value of the radius of the outer peripheral wall of the first connection region 120 is r, and r and R1 need to satisfy a specific relationship. In order to ensure a specific arrangement space for the second connection portion 131, r is set to be less than R1, so as to ensure that the second connection portion 131 has a specific area so as to increase the connection area between the second connection portion 131 and the bottom cover 300, and r is set to be not less than 1 / 2R1, so as to ensure that the first connection region 120 has a specific area so as to increase the connection area between the first connection region 120 and the electrode core 500. It should be noted.

[0258] That is, in the present application, in order to ensure that both the first connection portion 121 and the second connection portion 131 have a specific connection area, the relationship between r and R1 is set, so as to fixedly connect the second current collector plate 100 to the electrode core 500, fixedly connect the second current collector plate 100 to the bottom cover 300, and ensure that the second current collector plate 100 has a large current flow area.

[0259] Optionally, as shown in FIG. 18, the radius of the intermediate portion 122 is r1, where 5 mm < r1 < 1 / 2r. It should be noted that the radius of the intermediate portion 122 in this specification may also be understood as the radius dimension of the intermediate portion 122 when the intermediate portion 122 is formed on a circular support plate. Since the radius of the first connection region 120 is a fixed value, in order to ensure that both the first connection portion 121 and the intermediate portion 122 have a specific connection area, the relationship between the radius r1 of the intermediate portion 122 and r is set, whereby the second current collector plate 100 is fixedly connected to the electrode core 500, ensuring that the second current collector plate 100 has a large current flow area.

[0260] Optionally, as shown in FIG. 18, the radial width of the second connection portion 131 is W1, where 1 mm ≤ W1 ≤ 1 / 2R1. The radial width of the second connection portion 131 in this specification may be understood as the width of the second connection portion 131 and, when the second current collector plate 100 is formed in a substantially circular shape, the width extending in the radial direction of the second current collector plate 100. In some examples, the second connection portion 131 is disposed radially outside the first connection portion 121, and since the radius of the second current collector plate 100 is fixed, the aforementioned arrangement ensures that the connection area of the second connection portion 131 can meet the minimum connection requirements and that the first connection portion 121 has a sufficient connection area, whereby the electrode core 500 is electrically connected to the bottom cover 300 by using the second current collector plate 100.

[0261] In some embodiments of the present application, referring to FIGS. 17 to 20, in a first plane, the orthographic projection of the outer peripheral wall of the second current collector plate 100 is located on a circle. The first plane is perpendicular to the thickness direction of the second current collector plate 100. A stop protrusion 1313 is arranged at the second connection portion 131. The stop protrusion 1313 extends toward the first connection portion 121. The stop protrusion 1313 is located radially outside the first connection portion 121. The stop protrusion 1313 is located radially outside the second tab 502. The radially outside of the first connection portion 121 in this specification may be understood as the side of the first connection portion 121 and the side closer to the radially outside of the second current collector plate 100 when the shape of the second current collector plate 100 is formed in a shape similar to a circle. On the one hand, the stop protrusion 1313 may reinforce the second connection portion 131, that is, improve the structural strength of the second connection portion 131, and avoid deformation when the second connection portion 131 is connected to the bottom cover 300, thereby ensuring that the second connection portion 131 is stably connected to the bottom cover 300. On the other hand, the position of the tab on the electrode core 500 may be restricted, and as a result, the tab can be stably arranged on the electrode core 500, thereby preventing damage to the electrode core 500 caused by the welding joint being pulled by the loose tab under actual operating conditions.

[0262] Optionally, as shown in FIGS. 17 to 20, the stop protrusion 1313 extends in the circumferential direction of the second connection portion 131. In order to increase the area of the stop protrusion 1313, the stop protrusion 1313 extends in the circumferential direction of the second current collector plate 100 formed in a circular shape, thereby ensuring that the stop protrusion 1313 can effectively improve the structural strength of the second connection portion 131, ensuring that the stop protrusion 1313 can effectively restrict the position of the tab, and further ensuring that the tab is stably arranged on the electrode core 500.

[0263] In addition, the stop protrusion 1313 extending in the circumferential direction of the second connection portion 131 can further protect the tab and extend the life of the tab, that is, extend the life of the electrode core 500.

[0264] Naturally, in some other examples, there are multiple stop protrusions 1313. The multiple stop protrusions 1313 are spaced apart in the circumferential direction of the second connection portion 131. Thus, the structural strength of the second connection portion 1313 may be improved by using the stop protrusions 1313, and the position of the tab may be restricted by the stop protrusions 1313.

[0265] Optionally, to ensure that the stop projection 1313 can effectively protect the tab and restrict its position, the extension length of the stop projection 1313 to the first connection 121 is greater than or equal to the exposed height of the tab.

[0266] In a specific example, the exposed height of the tab is in the range of 0.5 mm to 2 mm. That is, the extension length of the stop projection 1313 to the first connection portion 121 is greater than 0.5 mm.

[0267] By choice, the stop projection 1313 is defined by bending and deforming a part of the second connecting portion 131. That is, in the process of manufacturing the second connecting portion 131, a part of the structure of the second connecting portion 131 is bent and deformed to form the stop projection 1313. In this way, there is no need to connect a separate structural member to the second connecting portion 131 to form the stop projection 1313, thereby reducing the difficulty of manufacturing the stop projection 1313, that is, reducing the difficulty of manufacturing the second connecting portion 131, and further improving the positional stability of the stop projection 1313.

[0268] Optionally, a reinforcing portion 1311 is positioned around the stop projection 1313, as shown in Figures 17 to 20. The reinforcing portion 1311 is configured to improve the structural strength of the stop projection 1313 and the second connecting portion 131, to prevent deformation when the second connecting portion 131 is connected to the bottom cover 300, and to ensure that the stop projection 1313 can effectively protect the tab and restrict the tab's position.

[0269] As can be arbitrarily selected, multiple reinforcing parts 1311 exist, as shown in Figures 17 to 20, and these reinforcing parts 1311 are spaced apart. The multiple reinforcing parts 1311 cooperate to maximize the structural strength of the stopping projection 1313 and the second connecting part 131.

[0270] By option, as shown in Figures 17 to 20, a bypass port 1312 for fluid flow is formed between two adjacent reinforcing portions 1311. That is, the two adjacent reinforcing portions 1311 only need to be spaced apart. In this way, the two adjacent reinforcing portions 1311 cooperate to form the bypass port 1312 on the outer circumferential wall of the second connection portion 131, eliminating the need to separately process the bypass port 1312 on the second connection portion 131. This reduces the difficulty of manufacturing the bypass port 1312, which in turn reduces the difficulty of manufacturing the second connection portion 131, and further improves the manufacturing efficiency of the second connection portion 131. In some embodiments, the bypass port 1312 is configured to enable communication between the opposing ends of the second connection portion 131 in order to ensure smooth gas flow within the electrode core 500.

[0271] In other words, the avoidance port 1312 of this application is formed in the discharge passage.

[0272] In some examples, as shown in Figures 17 to 20, multiple avoidance ports 1312 are provided on the outer circumferential wall of the second connection portion 131, and the multiple avoidance ports 1312 are evenly spaced and spaced apart from one another. In this way, the multiple avoidance ports 1312 work together to ensure that the gas distribution within the electrode core 500 can be more even.

[0273] It should be noted that the avoidance ports 1312 shown in Figures 17 to 20 are formed in a shape similar to a rectangle. In some other examples, the avoidance ports 1312 may be formed in a circular, triangular, or other shape instead. This is not particularly limited in this application.

[0274] Furthermore, it should be noted that the specific number of avoidance ports 1312 is not limited in this application. Those skilled in the art may determine the number based on the amount of gas generated inside the electrode core 500.

[0275] Optionally, the radial width of the bypass port 1312 is W2, where 0.5 mm ≤ W2 ≤ 5 mm. It should be noted that the radial width of the bypass port 1312 as used herein may be understood as the width to which the bypass port 1312 extends radially from the second current collector plate 100 when the shape of the second current collector plate 100 is similar to a substantially circular shape. When W2 is 0.5 mm, the discharge capacity of the bypass port 1312 decreases. When w2 is 5 mm, the manufacturing difficulty of the bypass port 1312 increases, and the connection area between the second connection portion 131 and the bottom cover 300 is affected.

[0276] Therefore, in this application, the radial width W2 of the avoidance port 1312 is set to 0.5 mm or more and 5 mm or less. In this way, it is guaranteed that the avoidance port 1312 can smoothly discharge gas from inside the electrode core 500, and that the avoidance port 1312 can be formed more effectively. In addition, the area of ​​the second connection portion 131 is guaranteed, that is, the connection area between the second connection portion 131 and the bottom cover 300 is guaranteed.

[0277] In some embodiments of this application, as shown in Figures 17 to 20, the electrolyte injection port 1221 penetrates the intermediate portion 122 in the thickness direction of the intermediate portion 122. In this specification, the electrolyte injection port 1221 is located in the intermediate portion 122 and penetrates the intermediate portion 122 in the thickness direction of the intermediate portion 122 to enable communication between both sides of the intermediate portion 122 in the thickness direction, thereby facilitating the injection of electrolyte into the electrode core 500 via the electrolyte injection port 1221.

[0278] In other words, in this application, when the second current collector plate 100 is electrically connected to the electrode core 500, the normal injection of electrolyte into the electrode core 500 can be further guaranteed.

[0279] Optionally, as shown in Figures 17 to 23, the electrolyte 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 electrolyte into the electrode core 500, and the positioning port 1223 mates with the tooling device to prevent the second current collector plate 100 from rotating during the installation process. The above arrangement may ensure that the electrolyte injection port 1221 facilitates the injection of electrolyte into the electrode core 500 and may also position the second current collector plate 100, thereby reducing the difficulty of connecting the second current collector plate 100 and the electrode core 500, improving connection efficiency, and ensuring connection accuracy between the second current collector plate 100 and the electrode core 500.

[0280] In addition, the positioning port 1223 may further prevent the second current collector plate 100 from rotating relative to the electrode core 500, thereby improving the positional stability of the second current collector plate 100.

[0281] In a specific example, the through-port 1222 is formed as a circular port, thereby facilitating the injection of electrolyte into the electrode core 500 through the through-port 1222 and ensuring the amount of electrolyte injected. The positioning port 1223 is formed as a rectangular port, thereby facilitating mating between the positioning port 1223 and the tooling device, thereby preventing the second current collector plate 100 from rotating during the installation process and reducing the difficulty of installing the second current collector plate 100.

[0282] In some embodiments of the present application, referring to FIGS. 23 and 24, a restriction port 132 is provided in the second connection portion 131, and the restriction port 132 is in a restricted fitting state with a restriction bump 310 on the bottom cover 300. That is, the restriction bump 310 is disposed on the bottom cover 300, and the restriction port is provided in the second connection portion 131. After the restriction bump 310 is in a restricted fitting state with the restriction port, restricted fitting between the second connection portion 131 and the bottom cover 300 can be achieved, thereby avoiding a change in the relative position between the second connection portion 131 and the bottom cover 300 during the connection process, thereby reducing the difficulty of connecting the second connection portion 131 to the bottom cover 300 and improving the connection efficiency.

[0283] Optionally, the second connection portion 131 is formed in a ring shape, and the restriction port 132 is a restriction port that extends to the inner peripheral wall of the second connection portion 131. In the present specification, the restriction port extends in the radial direction of the second connection portion 131 and extends to the inner peripheral wall of the second connection portion 131, whereby restricted fitting between the second connection portion 131 and the bottom cover 300 is achieved by using the restriction port.

[0284] Optionally, the restriction bump 310 is disposed on the bottom cover 300 and extends toward the second current collector plate 100, thereby ensuring that the restriction bump 310 can be in a restricted fitting state with the restriction port. As a result, the restriction port 132 and the restriction bump 310 cooperate to achieve restricted fitting between the second connection portion 131 and the bottom cover 300.

[0285] Optionally, the radial width of the second connection part 131 is W1, and the radial width W3 of the restriction port 132 satisfies the following condition: 0.5 mm ≤ W3 < W1. That is, the restriction port 132 has a specific width in the radial direction of the second current collector plate 100 formed in a circular shape, thereby facilitating the positional fitting via the restriction port 132 between the second connection part 131 and the bottom cover 300. In addition, the radial width of the restriction port 132 is set to be smaller than the radial width of the second connection part 131, thereby preventing the structural strength and connection area of the second connection part 131 from being reduced by the restriction port 132, thereby ensuring that the second connection part 131 has a specific structural strength, extending the service life, and guaranteeing a specific connection area between the second connection part 131 and the bottom cover 300.

[0286] Optionally, as shown in FIG. 23, the circumferential length of the restriction port 132 is G2, 0.5 mm ≤ G2 ≤ ΠR1 / n1, where n1 is the number of restriction ports 132, Π is the circumference ratio, and Π ≈ 3.14. When it is guaranteed that the restriction port 132 has a specific extension length for fitting with the restriction bump 310, it can be further prevented that the area of the second connection part 131 is excessively reduced by the restriction port 132, that is, there is a specific connection area between the second connection part 131 and the bottom cover 300 for fixedly connecting the second current collector plate 100 to the bottom cover 300.

[0287] As optional, there are multiple limiting ports 132, as shown in Figure 23. The multiple limiting ports 132 and the multiple first connectors 121 are arranged opposite each other in a one-to-one correspondence radially with respect to the second connector 131. In some embodiments, the multiple limiting ports 132 are provided to ensure effective positional fitting between the second connector 131 and the bottom cover 300. The multiple limiting ports 132 and the multiple first connectors 121 are arranged opposite each other in a one-to-one correspondence, and as a result, the limiting ports 132 can be positioned away from the connecting member 140, thereby preventing the limiting ports 132 from affecting the fixed connection between the second connector 131 and the intermediate part 122, that is, ensuring that the limiting ports 132 can effectively achieve positional fitting between the second connector 131 and the bottom cover 300, ensuring that the second connector 131 and the intermediate part 122 are effectively fixedly connected, and ensuring the positional stability and structural strength of the second current collector plate 100.

[0288] It should be noted that the figure shows an example where the orthogonal projection of the restriction port 132 onto the first plane forms a rectangle. In some other examples, the orthogonal projection of the restriction port 132 onto the first plane forms a square, triangle, sector, etc.

[0289] By option, the battery cell 1000 is a cylindrical battery, and as a result, the internal structure of the battery cell 1000 (electrode core 500 and bottom cover 300) can be fitted to a circular second current collector plate.

[0290] In some examples, the area of ​​the orthographic projection of the first connection portion 121 onto the first plane is S1, and the minimum connection area between the first connection portion 121 and the electrode core 500 is S, where S = γS1, and 0.2 ≤ γ ≤ 1. That is, the minimum connection area between the first connection portion 121 and the electrode core 500 may be smaller than the area of ​​the orthographic projection of the first connection portion 121 onto the first plane, but it is still necessary to ensure that the first connection portion 121 and the electrode core 500 have a sufficient connection area in order to guarantee the current flow capability of the second current collector plate 100.

[0291] In addition, the connection area between the first connection portion 121 and the electrode core 500 may be set to be smaller than the area of ​​the orthographic projection of the first connection portion 121 onto the first plane, thereby reducing the difficulty of connecting the second current collector plate 100 to the electrode core 500 and further improving the assembly efficiency of the battery cell 1000. The connection area between the first connection portion 121 and the electrode core 500 may be measured based on connection marks, such as weld marks. In some embodiments, the distinguishing boundary between the first connection portion 121 and the intermediate portion 122 may be a straight connection line between opposing side walls at the connection position between the first connection portion 121 and the intermediate portion 122.

[0292] In addition, the first connection region 120 is arranged to include a plurality of first connection portions 121, and the minimum connection area between each first connection portion 121 and the electrode core 500 is set to be at least 20% of the area of ​​the orthographic projection of the first connection portion 121 onto the first plane, thereby ensuring that there is sufficient connection area between the first connection portion 121 and the electrode core 500, thereby increasing the current flow area of ​​the second current collector plate 100, avoiding insufficient current flow in the electrode core 500 caused by a small current flow area of ​​the second current collector plate 100, that is, avoiding serious overheating problems of the electrode core 500, extending the service life of the electrode core 500, and improving the safety of use of the electrode core 500.

[0293] In addition, the connection area between the first connection part 121 and the electrode core 500 is limited, further reducing the difficulty of connecting the first connection part 121 and the electrode core 500, thereby improving connection efficiency.

[0294] Compared to the prior art, the second current collector plate 100 of this application can effectively electrically connect the electrode core 500 to the bottom cover, ensure the connection area between the second current collector plate 100 and the electrode core 500, and improve the current flow capability of the second current collector plate 100, thereby improving the safety of use of the battery cell 1000 and extending the service life of the battery cell 1000.

[0295] It should be noted that the connection between the first connection portion 121 and the electrode core 500, and the connection between the second connection region 130 and the housing, may both be achieved by welding, joining, or other means.

[0296] Optionally, the material of the second current collector plate 100 may be an aluminum alloy, pure copper, nickel-plated copper, etc. As a result, the second current collector plate 100 has a conductive function, and as a result, the electrode core 500 is electrically connected to the bottom cover by using the second current collector plate 100.

[0297] In some embodiments, when the material of the second current collector plate 100 is an aluminum alloy, the second current collector plate 100 is primarily mated and connected to the positive electrode tab of the electrode core 500. When the material of the second current collector plate 100 is pure copper or nickel-plated copper, the second current collector plate 100 is primarily mated and connected to the negative electrode tab of the electrode core 500. That is, a person skilled in the art may select the material of the second current collector plate 100 based on the application environment of the second current collector plate 100. This is not particularly limited in this application.

[0298] In the description of this application, the features defined by “first” and “second” may include one or more such features, either explicitly or implicitly, and are used to distinguish and describe features rather than to indicate order or importance.

[0299] It should be noted that in some cases, a minimum connection zone may be provided on the first connection part 121 to ensure that the operator can effectively determine whether the minimum connection area between the first connection part 121 and the electrode core 500 meets the requirements. If the entire minimum connection zone is connected to the electrode core 500, the minimum connection area between the first connection part 121 and the electrode core 500 is determined to meet the requirements.

[0300] By option, multiple positioning parts, such as positioning grooves or positioning protrusions, are arranged on the first connection part 121, and the area surrounded by the multiple positioning parts forms the minimum connection zone.

[0301] In some examples, as shown in Figure 17, the second connection area 130 is located radially outward of the first connection area 120, thereby appropriately positioning the relative positions of the first connection area 120 and the second connection area 130, and thereby ensuring the area of ​​the first connection area 120 and the second connection area 130.

[0302] In some embodiments of this application, an identification region (not shown) is provided on the first connection portion 121, and the identification region is welded to the electrode core 500. In this way, the first connection portion 121 is electrically connected to the electrode core 500.

[0303] In addition, the identification region is positioned to reduce the difficulty of connecting the first connection portion 121 and the electrode core 500 and improve connection efficiency, and to determine whether the connection area between the first connection portion 121 and the electrode core 500 satisfies the corresponding requirements, that is, to determine whether the minimum connection area between the first connection portion 121 and the electrode core 500 is 20% or more of the area of ​​the orthographic projection of the first connection portion 121 onto the first plane.

[0304] In some examples, the area of ​​the identification region is equal to 20% of the area of ​​the orthographic projection of the first connection portion 121 onto the first plane. Thus, after the identification region is fully connected to the electrode core 500, the minimum connection area between the first connection portion 121 and the electrode core 500 can satisfy the corresponding requirements.

[0305] Therefore, because an identification area is provided, when connecting the first connector 121 to the electrode core 500, the worker can determine whether the minimum connection area between the first connector 121 and the electrode core 500 meets the requirements based on whether the identification area is fully connected to the electrode core 500. In some embodiments, after it is determined that the identification area is fully connected to the electrode core 500, it is determined that the minimum connection area between the first connector 121 and the electrode core 500 meets the corresponding requirements. After it is determined that the identification area is not fully connected to the electrode core 500, it is determined that the minimum connection area between the first connector 121 and the electrode core 500 does not meet the corresponding requirements. In this case, the first connector 121 needs to be continuously welded to the electrode core 500 until the minimum connection area between the first connector 121 and the electrode core 500 meets the corresponding requirements.

[0306] It should be noted that even after it has been determined that the identification area is fully connected to the electrode core 500, the first connection portion 121 may continue to be connected to the electrode core 500. In some embodiments, it is shown that the larger the connection area between the first connection portion 121 and the electrode core 500, the stronger the current flow capability of the second current collector plate 100, and the greater the safety of use of the battery cell 1000. Optionally, a plurality of positioning portions, such as positioning grooves or positioning protrusions, are arranged on the first connection portion 121, and the area surrounded by the plurality of positioning portions forms the identification area. In this way, the operator can clearly observe the position and size of the identification area, thereby facilitating the operator to determine whether the minimum connection area between the first connection portion 121 and the electrode core 500 is 20% or more of the area of ​​the orthographic projection of the first connection portion 121 onto the first plane.

[0307] In some examples, the minimum connection area S between the first connection portion 121 and the electrode core 500 may be determined according to the minimum current flow requirement C of the electrode core 500. In some embodiments, the minimum connection area S between the first connection portion 121 and the electrode core 500, and the minimum current flow requirement C of the electrode core 500 must satisfy the following condition: nNKS≧C. In this specification, n is the number of first connection portions 121, N is the compensation coefficient, N=0.7~1, and K is the current flow coefficient of the first connection portion 121.

[0308] K may be directly determined based on the material of the first connection part 121, and the unit may be AH / mm 2 It should be noted that the minimum current flow requirement C for the electrode core 500 may be determined based on the required charging period of the electrode core 500. The specific determination method is as follows. In the actual manufacturing process of the battery cell 1000, the rapid charging period to be satisfied by the manufactured battery cell 1000 may be determined directly, that is, the charging period of the battery cell 1000 may be explicitly recognized, the charging period of the electrode core 500 may be determined based on the charging period of the battery cell 1000, then the minimum current flow requirement C of the electrode core 500 may be obtained based on the charging period of the electrode core 500, and finally, the minimum connection area S between the first connection part 121 and the electrode core 500 may be calculated based on the minimum current flow requirement C, so that the minimum connection area S between the first connection part 121 and the electrode core 500 and the minimum current flow requirement C of the electrode core 500 can satisfy specific conditions, thereby ensuring that the current flow capability of the second current collector plate 100 can satisfy the minimum current flow requirement of the electrode core 500, avoiding insufficient current flow in the electrode core 500, avoiding serious overheating problems of the electrode core 500, extending the service life of the electrode core 500, and improving the safety of use of the electrode core 500.

[0309] In some specific examples, the minimum current flow requirement C for electrode core 500 is equal to 15AH to 120AH.

[0310] Optionally, in order to further guarantee the current flow capability of the second current collector plate 100, the connection width H between the first connection portion 121 and the intermediate portion 122, and the minimum current flow requirement C of the electrode core 500 also need to meet certain conditions.

[0311] In this specification, the connection width H may be understood as the straight-line distance between opposing side walls at the connection point between the first connection portion 121 and the intermediate portion 122. That is, there are two opposing side walls at the connection point between the first connection portion 121 and the intermediate portion 122, and the straight-line distance between the two side walls forms the connection width H between the first connection portion 121 and the intermediate portion 122 (see Figure 18 for specifics regarding the connection width H).

[0312] Specifically, the connection width H between the first connection portion 121 and the intermediate portion 122, and the minimum current flow requirement C of the electrode core 500 satisfy the following condition: nKHδ≧C. In this specification, n is the number of first connection portions 121, δ is the thickness of the first connection portions 121, and K is the current flow coefficient of the second current collector plate 100, where K may be directly determined based on the material of the second current collector plate 100, and the unit is AH / mm 2 That is the case.

[0313] In other words, in the actual manufacturing process of the battery cell 1000, it is ensured that the minimum connection area S between the first connection portion 121 and the electrode core 500 and the minimum current flow requirement C of the electrode core 500 meet specific conditions, and the connection width H between the first connection portion 121 and the intermediate portion 122 and the minimum current flow requirement C of the electrode core 500 also need to meet specific conditions, thereby effectively ensuring the current flow capability of the second current collector plate 100.

[0314] In some embodiments, the specific method for determining the connection width H between the first connection portion 121 and the intermediate portion 122 is as follows: In the actual manufacturing process of the battery cell 1000, the charging period of the battery cell 1000 may be determined directly. After the charging period of the battery cell 1000 is explicitly determined, first, the charging period of the electrode core 500 is determined based on the charging period of the battery cell 1000, the minimum current flow requirement C of the electrode core 500 is obtained based on the charging period of the electrode core 500, and finally, the connection width H between the first connection portion 121 and the intermediate portion 122 is calculated based on the minimum current flow requirement C, the number of first connection portions 121, and the thickness of the first connection portion 121, so that the connection width H between the first connection portion 121 and the intermediate portion 122 and the minimum current flow requirement C of the electrode core 500 satisfy specific conditions.

[0315] In addition, in this application, the connection width between the first connection portion 121 and the intermediate portion 122 is set more creatively, that is, the linear distance between opposing side walls at the connection position between the first connection portion 121 and the intermediate portion 122 is limited, and as a result, the linear distance between opposing side walls at the connection position between the first connection portion 121 and the intermediate portion 122 satisfies nKHδ≧C, thereby ensuring the current flow area of ​​the current collector plate 100, improving the current flow capability of the current collector plate 100, avoiding insufficient current flow in the electrode core 500 caused by a small current flow area of ​​the current collector plate 100, that is, avoiding the serious problem of overheating of the electrode core 500, thereby extending the service life of the electrode core 500 and improving the safety of use of the electrode core 500, that is, extending the service life of the battery cell 1000 and improving the safety of use of the battery cell 1000.

[0316] In some embodiments of this application, as shown in Figures 17 to 20, the orthographic projection of the outer circumferential wall of the second current collector plate 100 is located on a circle in a first plane. The first plane is perpendicular to the thickness direction of the second current collector plate 100. The second connector 131 is provided with a stop projection 1313 extending toward the first connector 121. The stop projection 1313 is located radially outward of the first connector 121. The stop projection 1313 is located radially outward of the second tab 502. Radially outward of the first connector 121 as used herein may be understood as the side of the first connector 121 that is closer to the radially outward of the second current collector plate 100, if the shape of the second current collector plate 100 is similar to a circular shape. If the stop projection 1313 is positioned radially outward of the first connection portion 121, the stop projection 1313 can be positioned radially outward of the second tab 502 after the second current collector plate 100 is connected to the electrode core 500. In this case, it is convenient to use the stop projection 1313 to restrict the position of the tab, and as a result the tab can be stably positioned on the electrode core 500, thereby preventing damage to the electrode core 500 due to the weld seam being pulled by a loose tab under actual operating conditions.

[0317] In other words, the second current collector plate 100 in this application can not only provide an electrical connection between the electrode core 500 and the bottom cover 300, but can also be used to secure the tab and ensure the operational performance of the battery cell 1000.

[0318] In some embodiments of this application, as shown in Figures 25 to 28, a second current collector plate 100 according to one embodiment of this application includes a first connection region 120 and a second connection region 130.

[0319] In some embodiments, the first connection region 120 is welded to the second tab 502 of the electrode core 500 (see Figure 2 for the specific structure of the electrode core 500). In this specification, the electrode core 500 includes the second tab 502, and the first connection region 120 is welded to the second tab 502 to achieve welding between the first connection region 120 and the electrode core 500, thereby helping to achieve an electrical connection between the electrode core 500 and the bottom cover 300 by using the second current collector plate 100.

[0320] As shown in Figure 25, the second connection region 130 includes a plurality of second connection sections 131. Each second connection section 131 is connected to the first connection region 120 via a connecting member 140. The connecting member 140 is constructed to be movable relative to the first connection region 120 and / or deformable relative to the first connection region 120, thereby changing the height difference between the first connection region 120 and the second connection region 130. The second connection region 130 is welded to the bottom cover 300. In this specification, a height difference exists between the first connection area 120 and the second connection area 130, and the connecting member 140 is constructed to be movable relative to the first connection area 120, or constructed to be deformable relative to the first connection area 120, or constructed to be movable relative to the first connection area 120 and deformable relative to the first connection area 120, and by using the connecting member 140, the height difference between the first connection area 120 and the second connection area 130 is changed, thereby adjusting the position of the second connection part 131 relative to the first connection area 120, that is, adjusting the relative positions of the second connection part 131 and the bottom cover 300.

[0321] In other words, the position of the second connecting portion 131 in this application is adjustable.

[0322] It should be noted that the height difference between the first connection area 120 and the second connection area 130 may be understood as the first connection area 120 and the second connection area 130 being spaced apart from each other in the height direction of the battery cell 1000, that is, the first connection area 120 and the second connection area 130 being positioned at different heights in the battery cell 1000.

[0323] In the description of this application, unless otherwise specified, “multiple” means two or more.

[0324] From the above-described structure, the second current collector plate 100 in this embodiment of the present application is arranged to include a first connection region 120 and a second connection region 130, and as a result, the first connection region 120 and the second connection region 130 can cooperate with each other to learn to electrically connect the electrode core 500 to the bottom cover 300.

[0325] Multiple second connecting parts 131 are arranged, and these multiple second connecting parts 131 cooperate to increase the contact area between the second current collector plate 100 and the bottom cover 300, thereby improving the connection strength between the second current collector plate 100 and the bottom cover 300, and as a result the relative position between the second current collector plate 100 and the bottom cover 300 is stabilized. In this way, the positional stability of the second current collector plate 100 is improved.

[0326] In the process of connecting the second current collector plate 100 to the bottom cover 300, if the position of the second connection area 130 relative to the bottom cover 300 is not adjustable, and if the difference in flatness of the welded surface of the bottom cover 300 is relatively large, or if the difference in flatness of the multiple second connection parts 131 is relatively large, it should be noted that a weld gap exists between the second current collector plate 100 and the bottom cover 300, ultimately increasing the likelihood of welding defects between the second current collector plate 100 and the bottom cover 300, which may affect the yield of the battery cells 1000.

[0327] Therefore, in this application, each second connection portion 131 is arranged to be connected to the first connection region 120 via a connecting member 140. Since the connecting member 140 is deformable relative to the first connection region 120 and / or deformable relative to the first connection region 120, the height difference between the first connection region 120 and the second connection region 130 can be changed by using the connecting member 140, that is, the positions of the multiple second connection portions 131 relative to the first connection portion 121 can be changed. Thus, even if there is a relatively large difference in the flatness of multiple welding points on the bottom cover 300, it can be guaranteed that each second connection portion 131 can be welded to the bottom cover 300, a gap between the second connection portion 131 and the bottom cover 300 is avoided, that is, a gap between the second current collector plate 100 and the bottom cover 300 is avoided, the effects caused by manufacturing errors are eliminated, thereby further improving the connection strength between the second current collector plate 100 and the bottom cover 300, ensuring the alignment of the opposing contact surfaces between the second current collector plate 100 and the bottom cover 300, reducing the possibility of welding defects, and subsequently ensuring the yield of the battery cells 1000.

[0328] This may also be understood as, in this application, if the second current collector plate 100 is connected to the bottom cover 300, the second connection portion 131 may be used to allow the second current collector plate 100 to absorb manufacturing errors of the second current collector plate 100 and / or the bottom cover 300, thereby improving the manufacturing precision of the battery cell 1000.

[0329] In a specific example, if there is a height difference between the first connection area 120 and the second connection area 130, and the connecting member 140 can change the height difference between the first connection area 120 and the second connection area 130, then when the bottom cover 300 is connected to the electrode core 500 by using the second current collector plate 100, the first connection area 120 may be connected to the electrode core 500 first. Since the first connection area 120 and the second connection area 130 have a height difference in the height direction of the battery cell 1000, after the first connection area 120 is connected to the electrode core 500, in the process of attaching the bottom cover 300, the second connection area 130 can be positioned close to the bottom cover 300, thereby reducing the difficulty of connecting the second connection area 130 and the bottom cover 300. In addition, since the first connection area 120 and the second connection area 130 are movable relative to each other, when the second connection area 130 is connected to the bottom cover 300, it can be ensured that the position of the second connection area 130 can change based on the position, shape, surface structure, etc. of the bottom cover 300. As a result, the second connection area 130 is effectively connected to the bottom cover 300, ensuring connection strength and connection area. By using the second current collector plate 100 to connect the bottom cover 300 to the electrode core 500, the possibility of welding defects between the second current collector plate 100 and the bottom cover 300 is reduced, and the yield of the battery cells 1000 is ensured.

[0330] In conclusion, the second current collector plate 100 in this application not only enables electrical connection between the electrode core 500 and the bottom cover 300, but also avoids welding gaps between the second current collector plate 100 and the bottom cover 300, thereby ensuring the yield of the battery cells 1000.

[0331] Compared with related technologies, the second current collector plate 100 in this application can solve the technical problem of the fitting gap between the opposing contact surfaces of the second current collector plate 100 and the bottom cover 300 when the second current collector plate 100 is cooperatively connected to the bottom cover 300, thereby reducing the possibility of welding defects in the second current collector plate 100.

[0332] Optionally, the material of the second current collector plate 100 may be an aluminum alloy, pure copper, nickel-plated copper, etc. As a result, the second current collector plate 100 has a conductive function, and consequently, by using the second current collector plate 100, the electrode core 500 is electrically connected to the bottom cover 300.

[0333] In some embodiments, when the material of the second current collector plate 100 is an aluminum alloy, the second current collector plate 100 is primarily mated and welded to the second tab 502 of the positive electrode of the electrode core 500. When the material of the second current collector plate 100 is pure copper or nickel-plated copper, the second current collector plate 100 is primarily mated and welded to the second tab 502 of the negative electrode of the electrode core 500. That is, a person skilled in the art may select the material of the second current collector plate 100 based on the application environment of the second current collector plate 100. This is not particularly limited in this application.

[0334] It should be noted that the above description mainly explains an example in which the second connection area 130 of the second current collector plate 100 is welded to the bottom cover 300.

[0335] Naturally, in some other examples, the second connection area 130 of the second current collector plate 100 may be welded to the housing as an alternative, thereby achieving an electrical connection between the electrode core 500 and the housing 600 by using the second current collector plate 100.

[0336] For the sake of clarity, the following example will primarily use a case where the second connection area 130 of the second current collector plate 100 is welded to the bottom cover 300.

[0337] In some examples, the first connection area 120 and the second connection area 130 are parallel to each other in the height direction of the battery cell 1000. While reducing the manufacturing difficulty of the first connection area 120 and the second connection area 130, the welding area between the first connection area 120 and the second tab 502, and the welding area between the second connection area 130 and the bottom cover 300 can be further guaranteed, thereby effectively achieving electrical connection between the electrode core 500 and the bottom cover 300 and reducing the difficulty of connection.

[0338] In the description of this application, the features defined by “first” and “second” may include one or more such features, either explicitly or implicitly, and are used to distinguish and describe features rather than to indicate order or importance.

[0339] In some embodiments of this application, as shown in Figures 25 and 26, a plurality of second connection portions 131 are spaced apart from one another, and the second connection region 130 is constructed such that the height difference between each second connection portion 131 and the first connection region 120 can be adjusted independently. That is, the height of each second connection portion 131 may be adjusted individually relative to the first connection region 120, and as a result, the height of each second connection portion 131 may be adjusted individually relative to the bottom cover 300, thereby ensuring that each second connection portion 131 can be welded to the bottom cover 300, avoiding gaps between the second connection portions 131 and the bottom cover 300, reducing the possibility of welding defects, and subsequently ensuring the yield of the battery cells 1000.

[0340] In some examples, as shown in Figures 25 and 26, each second connection portion 131 is individually connected to the first connection region 120 via a connecting member 140. Since the connecting member 140 is movable and / or deformable relative to the first connection region 120, it can be ensured that after the second connection portion 131 is connected to the connecting member 140, the position of the connected second connection portion 131 can be changed as the connecting member 140 moves and / or deforms relative to the first connection region 120, and as a result, the height difference between each second connection portion 131 and the first connection region 120 can be adjusted independently.

[0341] Naturally, in some other examples, after a plurality of second connection portions 131 are arranged spaced apart from each other, each second connection portion 131 may be arranged to connect to the first connection area 120 via a plurality of connecting members 140. This further helps to support the second connection portion 131 by using all of the plurality of connecting members 140, and ensures that the height difference between each second connection portion 131 and the first connection area 120 can be adjusted independently, thereby ensuring that the position of the second connection portion 131 is stable and achieving a stable connection between the second connection portion 131 and the bottom cover 300.

[0342] It should be noted that in the description of this application, unless otherwise specified, "multiple" means two or more.

[0343] Furthermore, it should be noted that spacing out the multiple second connection parts 131 from each other prevents adjacent second connection parts 131 from hindering each other's movement, thereby ensuring that the height of each second connection part 131 can be individually adjusted relative to the first connection area 120, and as a result, the position of the second connection parts 131 can be adjusted.

[0344] In some embodiments of this application, as shown in Figures 25 and 26, the connecting member 140 is a plate body that extends inclined with respect to the first connecting region 120 and is movable and / or deformable relative to the first connecting region 120. In this specification, the connecting member 140 is a plate body that extends inclined with respect to the intermediate portion 122 and is movable and / or deformable relative to the first connecting region 120, thereby ensuring that the connecting member 140 can move or deform relative to the first connecting region 120 under external force, thereby ensuring that the height difference between the first connecting region 120 and the second connecting region 130 is changed by using the connecting member 140, thereby eliminating the effects of welding defects caused by manufacturing errors. The second current collector plate 100 as a conductive element is generally made from a metallic conductive material such as copper, aluminum, or iron, which has properties such as elasticity and deformability in nature. In this case, the connecting member 140 is constructed as an inclined and extending plate body to enable movement and / or deformation of the second connecting portion 131 and to enable an adjustable position of the second connecting portion 131.

[0345] In a specific example, the connecting member 140 is a plate body that extends at an angle, is movable, and / or deformable. Thus, when the second current collector plate 100 is individually connected to the electrode core 500 and the bottom cover 300, if there are relatively large differences in the flatness of multiple welds on the bottom cover 300, the welds protruding toward the electrode core 500 generate a force that moves the corresponding second connection region 130 toward the electrode core 500. The second connection region 130 is connected to the first connection region 120 via an inclined and extending plate body. Because the inclined and extending plate body is easily repositioned or deformed under external force, when a protruding welded portion moves the corresponding second connection region 130 toward the electrode core 500, the second connection region 130 acts upon the inclined and extending plate body, thereby ensuring that the second connection region 130 can move effectively. That is, it ensures that the position of the second connection region 130 can change based on the flatness of the bottom cover 300. As a result, the second connection region 130 can be connected to multiple welded portions on the bottom cover 300, avoiding a fitting gap between the second connection region 130 and the bottom cover 300. This ensures alignment of the opposing contact surfaces of the second current collector plate 100 and the bottom cover 300, reducing the possibility of welding defects.

[0346] It should be noted that the second connection region 130 is capable of acting on a plate body that extends at an inclination. The specific action of the plate body may be as follows: The second connection region 130 moves one end of the plate body connected thereto toward the electrode core 500, and in the process of moving one end of the plate body, the other end of the plate body is fixed relative to the electrode core 500, and as a result the entire plate body rotates toward the electrode core 500, thereby achieving movement of the connecting member 140 relative to the first connection region 120; or, the second connection region 130 may bend one end of the plate body connected thereto toward the electrode core 500, and in the process of bending, the other end of the plate body may be fixed relative to the electrode core 500, thereby achieving deformation of the connecting member 140 relative to the first connection region 120.

[0347] In a specific example, the connecting member 140 is formed as a rectangular plate, thereby ensuring that the second connecting portion 131 is fixedly connected to the first connecting region 120 by using the connecting member 140, and that after the connection is completed, the second connecting portion 131 is positioned radially outward of the first connecting region 120.

[0348] Naturally, in some other examples, the connecting member 140 may be formed as a rectangular plate, a fan-shaped plate, or the like, as an alternative. This is not particularly limited in this application.

[0349] Optionally, the connecting member 140 is made from a conductive material such as aluminum or copper. When the first connection region 120 is connected to the second connection region 130 by using the connecting member 140, under the action of an external force, the second connection region 130 can effectively act on the inclined and extending connecting member 140, that is, the connecting member 140 can effectively move and / or deform relative to the first connection region 120, thereby ensuring that the height difference between the first connection region 120 and the second connection region 130 is changed.

[0350] It should be noted that the specific length, width, and thickness of the connecting member 140 are not limited in this application, provided that it is ensured that the connecting member 140 can effectively connect the first connection region 120 to the second connection region 130, and that under the action of external forces, the second connection region 130 can effectively operate on the inclined connecting member 140.

[0351] Naturally, in some other examples, the connecting member 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. Thus, the connecting member 140 may be constructed to be movable and / or deformable relative to the first connecting region 120, thereby changing the height difference between the first connecting region 120 and the second connecting region 130.

[0352] In a specific example, if the connecting member 140 is a buffer spring, and the second current collector plate 100 is individually connected to the electrode core 500 and the bottom cover 300, if the flatness of multiple welds on the bottom cover 300 differs significantly, the welds protruding toward the electrode core 500 will generate a force that moves the corresponding second connection region 130 toward the electrode core 500, causing the second connection region 130 to compress the buffer spring, deform the buffer spring, and thereby change the height difference between the first connection region 120 and the second connection region 130.

[0353] In some examples, referring to Figure 19, the range of the inclination angle of the connecting member 140 with respect to the first connection area 120 is 5° ≤ a < 90°. In some embodiments, if the range of the inclination angle of the connecting member 140 with respect to the first connection area 120 is less than 5°, the overall height of the second current collector plate 100 becomes low, resulting in the problem that the electrode core 500 cannot be effectively electrically connected to the bottom cover 300 by using the second current collector plate 100. If the inclination angle of the connecting member 140 with respect to the first connection area 120 is 90° or more, on the one hand, the overall height of the second current collector plate 100 increases, causing the second current collector plate 100 to occupy a large space and occupy the space for arranging the electrode core 500, thus reducing the capacity of the electrode core 500. On the other hand, the connecting member 140 cannot be effectively deformed or moved, meaning that the connecting member 140 cannot effectively change the height difference between the first connection area 120 and the second connection area 130, and thus the problem of welding defects caused by manufacturing errors cannot be solved.

[0354] Therefore, in this application, the range of the inclination angle a of the connecting member 140 with respect to the first connection region 120 is set to 5° ≤ a < 90°. In this way, it is ensured that the electrode core 500 can be effectively electrically connected to the bottom cover 300 by using the second current collector plate 100, that the height difference between the first connection region 120 and the second connection region 130 can be more effectively changed by using the connecting member 140, and that the overall height of the second current collector plate 100 is further prevented from becoming excessively high, thereby ensuring the capacity of the electrode core 500.

[0355] In a specific example, the inclination angle a of the connecting member 140 with respect to the first connection area 120 may be 5°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, etc.

[0356] Optionally, the height range between the first connection area 120 and the second connection area 130 is 1 mm to 10 mm. In some embodiments, the specific height values ​​of the first connection area 120 and the second connection area 130 may be adjusted based on the inclination angle a of the connecting member 140. To ensure that the inclination angle a of the connecting member 140 relative to the intermediate portion 122 can be in the range of 5° to 90°, the height range between the first connection area 120 and the second connection area 130 is set to 1 mm to 10 mm. Thus, by using the connecting member 140, it is ensured that the height difference between the first connection area 120 and the second connection area 130 can be effectively changed, and furthermore, the overall height of the second current collector plate 100 is prevented from becoming excessively high, thereby ensuring the capacitance of the electrode core 500.

[0357] In a specific example, the height between the first connection area 120 and the second connection area 130 may be 1 mm, 3 mm, 5 mm, 8 mm, 10 mm, etc.

[0358] In related technologies, it should be further emphasized that the electrode core 500 is spaced apart from the bottom cover 300, resulting in a specific height between the electrode core 500 and the bottom cover 300. In this application, the connecting member 140 is positioned to extend inclined with respect to the first connection region 120. Thus, the second current collector plate 100 has a specific height, and as a result, by using the second current collector plate 100, an electrical connection between the electrode core 500 and the bottom cover 300 can be achieved, and the height increase caused by bending the second current collector plate 100 can be avoided, thereby avoiding damage to the second current collector plate 100, avoiding stress concentration caused by bending the second current collector plate 100, and extending the service life of the second current collector plate 100.

[0359] In addition, in this application, the connecting member 140 is arranged such that there is a specific height difference between the first connecting region 120 and the second connecting portion 131. Compared to the case where the height is increased by bending the second current collector plate, the space occupied by the second current collector plate 100 in the height direction can be reduced. In this way, the height of the electrode core 500 can be increased accordingly, thereby increasing the capacity of the electrode core 500, i.e., increasing the capacity of the battery cell 1000.

[0360] In some embodiments of this application, as shown in Figures 25 and 26, the first connection region 120 includes an intermediate portion 122 and a plurality of first connection portions 121, the plurality of first connection portions 121 connected to the intermediate portion 122, spaced apart from each other, and surrounding the circularly formed first connection region 120. That is, the first connection region 120 is circularly formed and includes an intermediate portion 122 and a plurality of first connection portions 121. In some embodiments, the first connection region 120 is arranged to form a circular shape, and as a result, the first connection region 120 can conform to the shape of the electrode core 500, thereby ensuring that the first connection region 120 can be effectively connected to the electrode core 500 and ensuring a connection area between the first connection region 120 and the electrode core 500. The first connection region 120 is arranged to include an intermediate portion 122 and a plurality of first connection portions 121. Thus, when the first connection area 120 is welded to the second tab 502 of the electrode core 500, the welding area between the first connection area 120 and the second tab 502 can be increased, that is, the welding area between the second current collector plate 100 and the second tab 502 can be increased. On the one hand, the connection strength between the second current collector plate 100 and the electrode core 500 is improved, and as a result, the second current collector plate 100 and the electrode core 500 are in a stable relative position, thereby improving the positional stability of the second current collector plate 100. On the other hand, it can be further ensured that the second current collector plate 100 has a relatively large current flow area, thereby avoiding insufficient current flow to the electrode core 500 due to a small current flow area of ​​the second current collector plate 100, thereby avoiding the problem of excessive heat generation of the electrode core 500, extending the service life of the electrode core 500, and improving the safety of use of the electrode core 500.

[0361] In addition, the multiple first connection portions 121 are individually connected to the intermediate portion 122, which may be used to support the multiple first connection portions 121, thereby improving the positional stability of the multiple first connection portions 121 to ensure the connection strength between the first connection region 120 and the second tab 502.

[0362] It should be noted that in the process of welding the first connection area 120 and the second tab 502, only the multiple first connection portions 121 and the second tab 502 may be welded. In this case, the main function of the intermediate portion 122 is to support the multiple first connection portions 121 and improve the positional stability of the multiple first connection portions 121. Naturally, in order to further increase the welding area between the first connection area 120 and the second tab 502, all of the multiple first connection portions 121 and the intermediate portion 122 may be welded to the second tab 502.

[0363] In addition, the multiple first connecting portions 121 are spaced apart from each other to avoid the connecting member 140, ensuring that the second connecting portion 131 can be effectively connected to the first connection region 120 via the connecting member 140, and as a result, the position of the second connecting portion 131 becomes adjustable.

[0364] In some examples, as shown in Figures 25 and 26, the second connection portion 131 is connected to the intermediate portion 122 via a connecting member 140. That is, in this application, the second connection portion 131 is mainly connected to the intermediate portion 122 to achieve connection between the second connection portion 131 and the first connection region 120. In this case, the intermediate portion 122 is used to support the second connection portion 131, and the relative position of the second connection portion 131 with respect to the first connection region 120 is adjustable.

[0365] In some specific examples, as shown in Figures 25 and 26, the intermediate portion 122 is formed as a circular support plate. The multiple first connection portions 121 are all formed as fan-shaped connection plates. The multiple first connection portions 121 are connected to the radially outer side of the intermediate portion 122 and spaced apart in the circumferential direction of the intermediate portion 122. Thus, after the multiple first connection portions 121 are connected to the intermediate portion 122, the first connection region 120 may be formed in a circular shape, and as a result, the first connection region 120 conforms to the shape of the electrode core 500, thereby increasing the connection area between the first connection region 120 and the electrode core 500.

[0366] In some embodiments of this application, the second current collector plate 100 is an integrally formed member. That is, the entire second current collector plate 100 is manufactured using an integral molding process, thereby reducing the difficulty of manufacturing the second current collector plate 100, improving manufacturing efficiency, ensuring connection strength and quality between the intermediate portion 122, the first connection portion 121, the second connection portion 131, and the connecting member 140, stabilizing the structure of the second current collector plate 100, and electrically connecting the electrode core 500 to the bottom cover 300 by using the second current collector plate 100.

[0367] It should be noted that in the process of manufacturing the second current collector plate 100, the second current collector plate 100 may be cut, and after the cutting is completed, the connecting member 140 may be further bent to form structures such as the intermediate portion 122, the first connecting portion 121, the second connecting portion 131, and the connecting member 140 on the second current collector plate 100.

[0368] In some embodiments, referring to Figures 25 and 26, the first connection region 120 includes an intermediate section 122 and a plurality of first connection sections 121. The intermediate section 122 is formed from a circular aluminum plate or a circular copper plate. The first connection sections 121 are formed from a fan-shaped aluminum plate or a fan-shaped copper plate. The plurality of first connection sections 121 surround the intermediate section 122, are individually connected to the intermediate section 122, and are spaced apart. Between two adjacent first connection sections 121, a connecting member 140 formed from a rectangular aluminum plate or a rectangular copper plate is positioned, and the connecting member 140 and the first connection sections 121 are spaced apart in the circumferential direction of the first connection region 120. The first end of the connecting member 140 and the radial end of the first connection region 120 are connected to the intermediate section 122.

[0369] As shown in Figures 25 and 26, the second connection region 130 includes a plurality of second connection portions 131, each of which is formed from an arc-shaped aluminum plate or an arc-shaped copper plate. The plurality of second connection portions 131 surround the first connection region 120 and are spaced apart from each other. The second end of the connecting member 140, which is also the second radial end of the first connection region 120, is connected to the radially intermediate portion of the second connection portion 131. In addition, the connecting member 140 extends inclined relative to the first connection region 120, so that the first connection region 120 and the second connection region 130 are spaced apart in the height direction of the battery cell 1000.

[0370] In a specific example, when the second current collector plate 100 is individually connected to the electrode core 500 and the bottom cover 300, the first connection area 120 is first connected to the electrode core 500. Because there is a height difference between the first connection area 120 and the second connection area 130 in the height direction of the battery cell 1000, the bottom cover 300 can effectively contact and fit with the second connection area 130 during the process of installing the bottom cover 300. In addition, in the process of connecting the bottom cover 300 to the second connection area 130, if there is a welded portion on the bottom cover 300 that protrudes toward the electrode core 500, the welded portion moves the corresponding second connection portion 131 toward the electrode core 500, and the second connection portion 131 rotates the second end of the connecting member 140 toward the electrode core 500 around the first end, or bends the second end of the connecting member 140 toward the electrode core 500, and as a result the bottom cover 300 moves and / or deforms the connecting member 140 relative to the first connection area 120, thereby changing the height of the second current collector plate 100, enabling the second current collector plate 100 to be effectively connected to the bottom cover 300, ensuring alignment of the opposing contact surfaces of the second current collector plate 100 and the bottom cover 300, and reducing the possibility of welding defects.

[0371] In some embodiments of this application, as shown in Figures 25 and 26, a plurality of first connection portions 121 and a plurality of connecting members 140 are arranged alternately in the circumferential direction of the intermediate portion 122. In this specification, one connecting member 140 is arranged between two adjacent first connection portions 121, and correspondingly, one first connection portion 121 is arranged between two adjacent connecting members 140, thereby making proper use of the space of the second current collector plate 100, and as a result, a plurality of first connection portions 121 and a plurality of connecting members 140 can be arranged simultaneously on the same second current collector plate 100, thereby increasing the current flow area of ​​the second current collector plate 100 by using a plurality of first connection portions 121, and ensuring that the second connection portion 131 can be connected to the intermediate portion 122 by using the connecting members 140.

[0372] In some examples, as shown in Figures 25 and 26, a plurality of first connection portions 121 are spaced apart in the circumferential direction of the second current collector plate 100, and a connecting member 140 is placed between two adjacent first connection portions 121, so that the plurality of first connection portions 121 and the plurality of connecting members 140 can be arranged alternately in the circumferential direction of the intermediate portion 122, thereby arranging the plurality of first connection portions 121 and the plurality of connecting members 140 on the second current collector plate 100 simultaneously.

[0373] By option, as shown in Figures 25 to 26, the connecting member 140 and the first connecting portion 121 are spaced apart in the circumferential direction of the second current collector plate 100, thereby preventing the first connecting portion 121 from hindering the deformation and / or movement of the connecting member 140, that is, ensuring that the connecting member 140 can effectively move and / or deform relative to the first connecting region 120, thereby changing the height difference between the first connecting region 120 and the second connecting region 130 and eliminating the effects of welding defects caused by manufacturing errors.

[0374] By option, the second current collector plate 100 is a circular second current collector plate, and as a result, the shape of the second current collector plate 100 can be adapted to the shape of the electrode core 500 and the bottom cover 300, thereby reducing the difficulty of connecting the second current collector plate 100 to both the electrode core 500 and the bottom cover 300 and ensuring connection quality.

[0375] The provision of the second current collector plate 100 as a circular second current collector plate can be understood as the case where, in the first plane, the orthographic projection of the outer wall of the second current collector plate 100 lies on a circle, and the first plane is perpendicular to the thickness direction of the second current collector plate 100.

[0376] Optionally, the circumferential distance between the connecting member 140 and the first connecting portion 121 is in the range of 0.5 mm to 2 mm. In this specification, it may be understood that the distance between the connecting member 140 and the first connecting portion 121 in the circumferential direction of the circular second current collector plate 100 is 0.5 mm to 2 mm in order to separate the connecting member 140 from the first connecting portion 121 and to ensure that the connecting member 140 can effectively move and / or deform relative to the first connecting region 120.

[0377] In some embodiments of this application, as shown in Figures 25 and 26, the distance between the opposing side walls of each first connection portion 121 gradually increases in the direction away from the intermediate portion 122. In this way, the area of ​​the first connection portion 121 is increased, thereby ensuring a sufficient welding area between the first connection portion 121 and the second tab 502 of the electrode core 500. Thus, it is ensured that the second current collector plate 100 has a large current flow area, insufficient current flow in the electrode core 500 caused by a small current flow area of ​​the second current collector plate 100 is avoided, serious overheating problems of the electrode core 500 are avoided, the service life of the electrode core 500 is extended, and the safety of use of the electrode core 500 is improved.

[0378] In some examples, the first connection portion 121 may be formed in a fan shape as shown in Figures 25 and 26. The fan shape allows the spacing between the opposing side walls of the first connection portion 121 to gradually widen in the direction away from the intermediate portion 122, thereby increasing the area of ​​the first connection portion 121.

[0379] Naturally, in some other examples, the first connecting portion 121 may be formed in the shape of a triangle, rectangle, circle, or the like, but this is not limited to the present application.

[0380] In some embodiments of this application, as shown in Figures 25 and 26, the same second connecting portion 131 is positioned radially outward of any two adjacent first connecting portions 121 in the circumferential direction of the intermediate portion 122. Radially outward of the first connecting portion 121 as used herein may be understood as the radial side of the first connecting portion 121 and away from the intermediate portion 122. Thus, as used herein, the second connecting portion 131 is positioned radially on the radial side of the first connecting portion 121 and away from the intermediate portion 122, and the second connecting portion 131 positioned radially outward of two adjacent first connecting portions 121 is understood to be the same second connecting portion 131. In the process of positioning the first connecting portion 121 and the connecting member 140, the connecting member 140 is positioned mainly between two adjacent first connecting portions 121. Therefore, the same second connecting portion 131 is positioned radially outward of two adjacent first connecting portions 121, thereby ensuring that the second connecting portion 131 can be connected to a connecting member 140 located between the two adjacent first connecting portions 121, thereby ensuring that the connecting member 140 can effectively move the second connecting portion 131 to change the height difference between the first connecting region 120 and the second connecting region 130.

[0381] In addition, the above-described configuration allows the connecting member 140 to be connected to the radially intermediate portion of the second connecting portion 131, thereby further ensuring that when the connecting member 140 moves or deforms, the connecting member 140 effectively moves the second connecting portion 131, that is, after the position of the second connecting portion 131 changes under external force, the second connecting portion 131 effectively moves and / or deforms the connecting member 140, ensuring that the height difference between the first connecting region 120 and the second connecting region 130 changes.

[0382] In addition, the second connector 131 is positioned radially outward of the first connector 121, thereby ensuring sufficient space for positioning the second connector 131 to increase its area, thereby increasing the welding area between the second connector 131 and the bottom cover 300 and achieving a fixed connection between the second connector 131 and the bottom cover 300.

[0383] Naturally, in some other examples, the second connection portion 131 may be alternatively located between two adjacent first connection portions 121 (not shown in the illustrative figures). This is not particularly limited in this application.

[0384] In some embodiments of this application, referring to Figures 25 and 26, a stop projection 1313 is located on at least one second connection portion 131. The stop projection 1313 extends toward the first connection portion 121. The stop projection 1313 is located radially outward of the first connection portion 121. The stop projection 1313 is located radially outward of the second tab 502 of the electrode core 500. As used herein, “radially outward” also means radially outward of the first connection portion 121 and radially away from the intermediate portion 122. The stopping projection 1313 may, on the one hand, reinforce the second connection portion 131, i.e., improve the structural strength of the second connection portion 131, thereby avoiding deformation when the second connection portion 131 is welded to the bottom cover 300, thereby ensuring that the second connection portion 131 can be stably connected to the bottom cover 300; and on the other hand, the position of the second tab 502 may be restricted by using the second connection portion 131, as a result the second tab 502 can be stably positioned on the electrode core 500, thereby preventing damage to the electrode core 500 due to the welding seam being pulled by the loosened second tab 502 under actual operating conditions.

[0385] In some examples, as shown in Figures 25 and 26, a stop projection 1313 is provided on each second connection 131, thereby ensuring that multiple stop projections 1313 can cooperate to restrict the position of the second tab 502, and that the structural strength of each second connection 131 can be enhanced, thereby further ensuring that the second tab 502 can be stably positioned on the electrode core 500.

[0386] In addition, the multiple stop protrusions 1313 may cooperate to protect the second tab 502, thereby extending the service life of the second tab 502, i.e., extending the service life of the electrode core 500.

[0387] Optionally, to ensure that the stop projection 1313 can effectively protect the second tab 502 and restrict the position of the second tab 502, the extension length of the stop projection 1313 to the first connection 121 is greater than or equal to the exposed height of the second tab 502.

[0388] In a specific example, the exposed height of the second tab 502 is in the range of 0.5 mm to 2 mm. That is, the extension length of the stop projection 1313 to the first connection 121 is greater than 0.5 mm.

[0389] By choice, as shown in Figures 25 and 26, the stop projection 1313 is defined by bending and deforming a part of the second connecting portion 131. That is, in the manufacturing process of the second connecting portion 131, a part of the structure of the second connecting portion 131 is bent and deformed to form the stop projection 1313. In this way, there is no need to connect a separate structural member to the second connecting portion 131 to form the stop projection 1313, thereby reducing the difficulty of manufacturing the stop projection 1313, that is, reducing the difficulty of manufacturing the second connecting portion 131, and further improving the positional stability of the stop projection 1313.

[0390] Optionally, a reinforcing portion 1311 is positioned around the stop projection 1313, as shown in Figures 25 and 26. The reinforcing portion 1311 is configured to improve the structural strength of the stop projection 1313 and the second connection portion 131, thereby preventing deformation when the second connection portion 131 is connected to the bottom cover 300, and further ensuring that the stop projection 1313 can effectively protect the second tab 502 and restrict the position of the second tab 502.

[0391] Optionally, as shown in Figures 25 and 26, the connection between the stop projection 1313 and the reinforcing portion 1311, located near the second tab 502, is arc-shaped for transition. By using the stop projection 1313, the second tab 502 is effectively protected and its position is restricted, and stress concentration at the connection between the stop projection 1313 and the reinforcing portion 1311 can be avoided, further avoiding damage to the second tab 502 caused when the stop projection 1313 collides with the second tab 502, thereby ensuring that the stop projection 1313 can effectively protect the second tab 502 and effectively restrict its position.

[0392] In some embodiments of this application, the multiple second connection portions 131 are arranged spaced apart from each other in the circumferential direction of the first connection region 120, thereby making proper use of the circumferential space of the first connection region 120, thereby increasing the area of ​​the second connection portions 131, and further increasing the welding area between the second connection portions 131 and the external structural member, thereby achieving a stable connection of the second current collector plate 100.

[0393] As shown in Figure 26, the minimum distance G3 between two adjacent second connection points 131 satisfies the following condition: 1 mm ≤ G3 ≤ ΠR1 / n2. The second current collector plate 100 is a circular second current collector plate, R1 is the radius of the circular second current collector plate, Π is pi, Π ≈ 3.14, and n2 is the number of regions between multiple second connection points 131.

[0394] In other words, the two adjacent second connection portions 131 are spaced apart from each other, and the distance between the two adjacent second connection portions 131 must satisfy certain conditions. In this way, the difficulty of forming the second connection portions 131 is reduced, and it can be further ensured that the second connection portions 131 have a sufficient area, thereby ensuring that the second connection portions 131 and the bottom cover 300 have a sufficient welding area. Furthermore, it should be noted that the foregoing limits the minimum distance G3 between the two adjacent second connection portions 131. In this specification, it can be understood that there may be multiple distances between the two adjacent second connection portions 131, and these multiple distances may be equal or unequal. In some embodiments, when there are multiple different distances between the two adjacent second connection portions 131, the minimum distance between the two adjacent second connection portions 131 must satisfy the aforementioned conditions in order to ensure that the relative position between the two adjacent second connection portions 131 can change under external force.

[0395] It should be noted that since the two adjacent second connection points 131 are spaced apart from each other, a separation region is formed between the two adjacent second connection points 131. Therefore, the aforementioned n2 may be understood as the amount of the separation region.

[0396] In some examples, the radius R1 of the circular second current collector plate is equal to 10 mm to 100 mm, that is, the radius of the second current collector plate 100 is between 10 mm and 100 mm, thereby ensuring that the size of the second current collector plate 100 can be adapted to both the electrode core 500 and the bottom cover 300, and as a result the second current collector plate 100 can be used to realize an electrical connection between the electrode core 500 and the bottom cover 300, ensuring that the second current collector plate 100 has a sufficient welding area with the electrode core 500 and the bottom cover 300.

[0397] Naturally, in some other examples, the radius R1 of the second current collector plate 100 is not limited to 10 mm to 100 mm. Those skilled in the art may limit the radius of the second current collector plate 100 based on the practical area of ​​the electrode core 500 and the bottom cover 300 in order to ensure a sufficient welding area between the second current collector plate 100 and both the electrode core 500 and the bottom cover 300.

[0398] Furthermore, it should be noted that when the radius of the second current collector plate 100 changes, the distance G3 between two adjacent second connection points 131 also changes accordingly.

[0399] Optionally, as shown in Figure 26, the radius of the first connection area 120 is r, and R1 ≥ r. That is, the radius of the first connection area 120 is less than or equal to the radius of the second current collector plate 100. In some embodiments, if the radius of the first connection area 120 is smaller than the radius of the second current collector plate 100, space may be provided for arranging the second connection area 130, thereby ensuring that the second connection area 130 can be positioned outside the radius of the first connection area 120 so as to ensure the area of ​​the first connection portion 121 and the second connection portion 131. If the radius of the first connection area 120 is equal to the radius of the second current collector plate 100, it can be ensured that the welding area between the first connection area 120 and the electrode core 500 reaches its maximum value, thereby reducing the impedance of the electrode core 500, satisfying the electrode core 500 to maintain a relatively large current flow capability, and improving the overall current flow capability of the second current collector plate 100.

[0400] Optionally, as shown in FIG. 26, the radius of the intermediate portion 122 is r1, where 5 mm < r1 < 1 / 2r. It should be noted that the radius of the intermediate portion 122 in this specification may also be understood as the radius dimension of the intermediate portion 122 when the intermediate portion 122 is formed on a circular support plate. Since the radius of the first connection region 120 is a fixed value, the relationship between the radius r1 of the intermediate portion 122 and r is set, thereby ensuring that both the first connection region 120 and the intermediate portion 122 have a specific connection area, and thereby fixedly connecting the second current collector plate 100 to the electrode core 500 and ensuring that the second current collector plate 100 has a large current flow area.

[0401] In some embodiments of the present application, as shown in FIG. 26, the radial width of the second connection portion 131 is W1, where 1 mm ≤ W1 ≤ 1 / 2R1, and R1 is the radius of the second current collector plate 100. It should be noted that the second current collector plate 100 is a circular second current collector, the first connection region 120 is circular, and the second connection portion 131 is disposed radially outside the first connection region 120. Therefore, the aforementioned radial width of the second connection portion 131 may be understood as the width by which the second connection portion 131 extends in the radial direction of the second current collector plate 100.

[0402] In some examples, the second connection portion 131 is disposed radially outside the first connection portion 121, and since the radius of the second current collector plate 100 is fixed, the aforementioned arrangement ensures that the welding area of the second connection portion 131 can meet the minimum welding requirements and ensures that the first connection portion 121 has a sufficient welding area, thereby electrically connecting the electrode core 500 to the bottom cover 300 by using the second current collector plate 100.

[0403] In some specific examples, as shown in FIG. 26, the second connection portion 131 is disposed radially outside the first connection region 120 and extends simultaneously in the circumferential and radial directions of the second current collector plate 100. As a result, the second connection portion 131 forms a substantially rectangular shape as shown in FIG. 26.

[0404] Naturally, in some other examples, the shape of the second connection portion 131 may be a different shape, such as a triangle or a circle, as an alternative. This is not particularly limited in this application.

[0405] In some embodiments of this application, as shown in Figure 27, the second current collector plate 100 is a circular second current collector plate. The second current collector plate 100 further includes a continuity portion 150, which is connected between two adjacent second connection portions 131. That is, the continuity portion 150 is positioned between two adjacent second connection portions 131, with one end of the continuity portion 150 connected to one of the two adjacent second connection portions 131, and the other end of the continuity portion 150 connected to the other of the two adjacent second connection portions 131. As a result, the use of the continuity portion 150 improves the structural strength of the second connection region 130 and extends the service life of the second connection region 130.

[0406] In some cases, the continuous portion 150 is formed integrally with the second connecting portion 131. This reduces the difficulty of manufacturing the second current collector plate 100 while further increasing the connection strength between the continuous portion 150 and the second connecting portion 131. As a result, the structure of the connection area 130 is stabilized, and a fixed connection between the second connection area 130 and the bottom cover 300 is achieved.

[0407] In some embodiments, the second current collector plate 100 is provided as a circular second current collector plate, and as a result, the shape of the second current collector plate 100 can be adapted to the shape of the electrode core 500 and the bottom cover 300, thereby reducing the difficulty of connecting the second current collector plate 100 to both the electrode core 500 and the bottom cover 300 and ensuring connection quality.

[0408] Optionally, as shown in FIG. 27, the radial width of the second connection portion 131 is W1, the radial width of the continuous portion 150 is W4, and 0.1 mm ≦ W4 < W1. The radial width of the second connection portion 131 in this specification refers to the extension length of the second connection portion 131 in the radial direction of the circular second current collector plate. The radial width of the continuous portion 150 refers to the extension length of the continuous portion 150 in the radial direction of the circular second current collector plate. That is, both the continuous portion 150 and the second connection portion 131 have a specific width in the radial direction of the second current collector plate 100. However, the radial width of the continuous portion 150 is smaller than the radial width of the second connection portion 131. By using the continuous portion 150, it is ensured that the structural strength of the second connection region 130 is increased, and the continuous portion 150 can further be prevented from inhibiting the movement of the second connection portion 131.

[0409] In some examples, the radial width of the continuous portion 150 is set smaller than the radial width of the second connection portion 131, so as to ensure that the continuous portion 150 can deform synchronously when the connection member 140 moves the second connection portion 131, thereby ensuring that the second connection portion 131 can move normally and avoiding the welding gap between the second connection portion 131 and the bottom cover 300.

[0410] Optionally, the continuous portion 150 is a connection plate, and the plate-like structure may allow the continuous portion 150 to deform under an external force.

[0411] In a specific example, the continuous portion 150 forms a rectangular aluminum plate or a rectangular copper plate, so as to ensure that the continuous portion 150 can deform synchronously when the connection member 140 moves the second connection portion 131.

[0412] It should be noted that in this application, the thickness of the continuous portion 150 is not particularly limited, provided that the continuous portion 150 can deform synchronously during the process of the connection member 140 moving the second connection portion 131.

[0413] The modifications described herein may be understood as the radial end of the continuous portion 150 being rotated or bent toward the electrode core 500 relative to another radial end of the continuous portion 150.

[0414] Optionally, as shown in Figure 27, the continuity 150 is positioned in the middle, on the inner surface, or on the outer surface of the second connection portion 131 to form a limiting port 132 between two adjacent second connection portions 131. The limiting port 132 is in a limiting fit with the limiting bump 310 on the bottom cover 300. In this specification, the inner surface of the second connection portion 131 refers to the side of the second connection portion 131 that is close to the first connection area 120. The outer surface of the second connection portion 131 refers to the side of the second connection portion 131 that is far from the first connection area 120. That is, the limiting bump 310 is positioned on the bottom cover 300, and the continuity 150 is positioned in the middle or on the outer surface of the second connection portion 131 to form a limiting port 132 between two adjacent second connection portions 131 that is in a limiting fit with the limiting bump 310. In some embodiments, after the limiting bump 310 is in a limiting fit state with the limiting port 132, positioning fit between the second connection region 130 and the bottom cover 300 can be achieved, thereby avoiding changes in the relative position between the second connection region 130 and the bottom cover 300 during the welding process, thereby reducing the difficulty of welding the second connection region 130 and the bottom cover 300 and improving welding efficiency.

[0415] In addition, in this application, the continuous portion 150 is positioned close to the inner or outer surface of the second connecting portion 131, and as a result, the limiting port 132 may be formed between two adjacent second connecting portions 131. In this way, in order to reduce the difficulty of forming the limiting port 132, it is not necessary for the limiting port 132 to be separately positioned within the second connecting region 130. In addition, the reduction in the welding area between the second connecting portion 131 and the bottom cover 300 due to the positioning of the limiting port 132 can be avoided, thereby ensuring that the second connecting portion 131 and the bottom cover 300 have a sufficient welding area.

[0416] Optionally, as shown in FIG. 23, the radial width of the second connection portion 131 is W1, and the radial width W3 of the restriction port 132 satisfies the following condition: 0.5 mm ≦ W3 < W1. The radial width of the restriction port 132 in this specification refers to the extension length of the restriction port 132 in the radial direction of the circular second current collector plate. That is, the restriction port 132 has a specific width in the radial direction of the second current collector plate 100, and thus, the restriction port 132 is formed so as to facilitate the positioning fit between the second connection portion 131 and the bottom cover 300 by using the restriction port 132. In addition, in order to ensure that a continuous portion 150 can be arranged between two adjacent second connection portions 131, the radial width of the restriction port 132 is set to be narrower than the radial width of the second connection portion 131. As a result, the structural strength of the second connection region 130 can be improved by using the continuous portion 150.

[0417] Optionally, as shown in FIGS. 23 and 27, there are a plurality of restriction ports 132. The plurality of restriction ports 132 and the plurality of first connection portions 121 are arranged to face each other in a one-to-one correspondence in the radial direction of the second connection portion 131. In some embodiments, the plurality of restriction ports 132 are provided to ensure an effective positional fit between the second connection portion 131 and the bottom cover 300. The plurality of restriction ports 132 and the plurality of first connection portions 121 are arranged to face each other in a one-to-one correspondence. As a result, the restriction port 132 can be arranged away from the connection member 140, thereby preventing the restriction port 132 from affecting the fixed connection between the second connection portion 131 and the intermediate portion 122. That is, it is ensured that the restriction port 132 can effectively achieve the positional fit between the second connection portion 131 and the bottom cover 300, and it is ensured that the second connection portion 131 and the intermediate portion 122 are effectively fixedly connected, and the positional stability and structural strength of the second current collector plate 100 are ensured.

[0418] It should be noted that the figure shows an example where the orthographic projection of the limiting port 132 onto the first plane forms a rectangle, and the first plane is perpendicular to the thickness direction of the second current collector plate 100. In some other examples, the orthographic projection of the limiting port 132 onto the first plane forms a square, triangle, sector, etc.

[0419] In some embodiments of this application, the orthogonal projection of the outer periphery wall of the second current collector plate 100 onto a first projection plane lies on a first ring, and the first projection plane is perpendicular to the thickness direction of the second current collector plate 100. The thickness direction of the second current collector plate 100 as used herein may also be understood as the height direction of the battery cell 1000. Therefore, the first projection plane may also be understood as a plane perpendicular to the height direction of the battery cell 1000. That is, the orthogonal projection of the outer periphery wall of the second current collector plate 100 onto a plane perpendicular to the height direction of the battery cell 1000 lies on the same circle, and as a result, the shape of the second current collector plate 100 is similar to a circular shape, i.e., the second current collector plate 100 is formed as a substantially circular second current collector plate. The circular second current collector plate 100 can be adapted to the shapes of the electrode core 500 and the bottom cover 300, thereby reducing the difficulty of connecting the second current collector plate 100 to the electrode core 500 and the bottom cover 300, increasing the connection area, and ensuring connection quality.

[0420] Referring to Figures 30 to 43, the second current collector plate 100 according to this embodiment of the present application includes a connecting portion 1110, a first support member 1120, and a second support member 1130.

[0421] In some embodiments, referring to Figures 28 to 30, the first surface 1111 of the connector 1110 is electrically connected to the bottom cover 300. It can be understood herein that the connector 1110 has a first surface 1111, and that by using the first surface 1111, the connector 1110 is connected to the bottom cover 300, thereby achieving an electrical connection between the connector 1110 and the bottom cover 300.

[0422] Correspondingly, the connector 1110 further has a second surface, the second surface being positioned opposite the first surface 1111. Referring to Figures 30 to 43, the first support member 1120 and the second support member 1130 are located on the side of the connector 1110 and away from the first surface 1111, the first support member 1120 is connected radially inward to the connector 1110 and is electrically connected to the second tab 502, the second support member 1130 is connected radially outward to the connector 1110 and supports the electrode core 500, and the connector 1110 is constructed to be movable and / or deformable relative to the first support member 1120.

[0423] In some embodiments, both the first support member 1120 and the second support member 1130 are positioned on the side of the connection portion 1110 and away from the first surface 1111, so that the first support member 1120 and the second support member 1130 have a height difference from the first surface 1111 of the connection portion 1110, i.e., the second current collector plate 100 has height. In this way, the first support member 1120 can be electrically connected to the electrode core 500, and the second support member 1130 can effectively support the electrode core 500.

[0424] Both the first support member 1120 and the second support member 1130 are positioned to connect to the radial structure of the connection portion 1110. On the one hand, a fixed connection can be achieved between the first support member 1120 and the connection portion 1110. In this way, after the connection portion 1110 is connected to the bottom cover 300 and the first support member 1120 is connected to the electrode core 500, an electrical connection can be achieved between the bottom cover 300 and the electrode core 500. That is, the second current collector plate 100 is used to achieve an electrical connection between the bottom cover 300 and the electrode core 500. On the other hand, the radial space of the connection portion 1110 can be appropriately used to increase the area of ​​the first support member 1120, the second support member 1130, and the connection portion 1110, thereby increasing the connection area between the first support member 1120 and the electrode core 500, and between the connection portion 1110 and the bottom cover 300. As a result, the second current collector plate 100 can be stably connected to the electrode core 500 and the bottom cover 300, thereby achieving an electrical connection between the electrode core 500 and the bottom cover 300 and ensuring connection quality.

[0425] The connecting portion 1110 may be set to be movable and / or deformable relative to the first support member 1120, thereby making the height of the connecting portion 1110 adjustable, i.e., the height of the second current collector plate 100 adjustable. In this way, when the second current collector plate 100 is used to connect the electrode core 500 to the bottom cover 300, the height of the second current collector plate 100 can be adaptively adjusted, thereby absorbing errors in the height direction that occur during the manufacturing process, thereby improving the quality of the connection between the electrode core 500 and the bottom cover 300 and reducing the possibility of welding defects.

[0426] Movement and / or deformation as described herein may be understood as changing the height of the connection 1110, i.e., making the height of the second current collector plate 100 adjustable, by constructing the connection 1110 to be movable relative to the first support member 1120, or to be deformable relative to the first support member 1120, or to be constructed to be movable and deformable relative to the first support member 1120, and it should be noted that as a result the second current collector plate 100 may be used to achieve an electrical connection between the electrode core 500 and the bottom cover 300.

[0427] From the above-described structure, it can be learned that in the second current collector plate 100 in this embodiment of the present application, the connecting portion 1110 may be positioned to be movable and / or deformable relative to the first support member 1120. Thus, in the process of using the second current collector plate 100, if there is a manufacturing error in the height direction of the second current collector plate 100, or if the flatness of the connection surface of the bottom cover 300 that fits with the connecting portion 1110 is high, the connecting portion 1110 can be adapted to be movable and / or deformable relative to the first support member 1120 depending on the position and flatness of the bottom cover 300, thereby ensuring that the connecting portion 1110 can be effectively connected to the bottom cover 300, thereby improving the connection strength between the connecting portion 1110 and the bottom cover 300, ensuring the alignment of the opposing contact surfaces between the connecting portion 1110 and the bottom cover 300, increasing the connection area, reducing the possibility of welding defects, and improving the yield of the battery cells 1000.

[0428] The aforementioned movement may be understood as the connecting portion 1110 moving toward the first support member 1120, and the deformation may be understood as the connecting portion 1110 bending and changing its height.

[0429] In this specification, when the second current collector plate 100 in this application is connected to the bottom cover 300, the connection portion 1110 may be used to allow the second current collector plate 100 to absorb height errors, and as a result the second current collector plate 100 can be effectively positioned between the bottom cover 300 and the electrode core 500, and it can be understood that an assembly gap between the second current collector plate 100 and the bottom cover 300 is avoided. Thus, the effects caused by assembly or manufacturing errors are eliminated, the connection strength between the second current collector plate 100 and the bottom cover 300 is improved, the alignment of the opposing contact surfaces between the second current collector plate 100 and the bottom cover 300 is ensured, the possibility of welding defects is reduced, the manufacturing accuracy of the battery cell 1000 is improved, and the yield of the battery cell 1000 is ensured. The second current collector plate 100 is used as a conductive element and is usually made from a metallic conductive material such as copper, aluminum, or iron, and has inherently elastic and deformable properties. The first support member 1120, the second support member 1130, and the connecting portion 1110 are arranged with a height difference such that the connecting portion 1110 can move and / or deform relative to the first support member 1120 under external force. That is, when the bottom cover 300 is attached, the bottom cover 300 presses against and connects to the connecting portion 1110 of the second current collector plate 100, so that the connecting portion 1110 can move and / or deform.

[0430] In a specific example, since the height of the connection portion 1110 can be changed, if the bottom cover 300 is connected to the electrode core 500 by using the second current collector plate 100, the first support member 1120 may be connected to the electrode core 500 first. Because there is a height difference between the first support member 1120 and the connection portion 1110 in the height direction of the battery cell 1000, in the process of attaching the bottom cover 300 after the first support member 1120 has been connected to the electrode core 500, the connection portion 1110 can be positioned close to the bottom cover 300, thereby reducing the difficulty of connecting the connection portion 1110 and the bottom cover 300. In addition, since the height of the connection portion 1110 is adjustable, in this case, when the connection portion 1110 is connected to the bottom cover 300, it can be guaranteed that the position of the connection portion 1110 can be changed based on the position, shape, surface structure, etc. of the bottom cover 300. As a result, the connection portion 1110 can be effectively connected to the bottom cover 300, ensuring connection strength and connection area. By using the second current collector plate 100 to connect the bottom cover 300 to the electrode core 500, the possibility of welding defects between the second current collector plate 100 and the bottom cover 300 is reduced, and the yield of the battery cells 1000 is guaranteed.

[0431] The connection between the first support member 1120 and the electrode core 500, and the connection between the connecting portion 1110 and the bottom cover 300, may both be achieved by welding, joining, or the like.

[0432] In addition, the connection portion 1110 is configured to be movable and / or deformable relative to the first support member 1120. To ensure the stability of the connection portion 1110 during movement and / or deformation, the present application provides that a second support member 1130 supporting the electrode core 500 is connected to the radially outer side of the connection portion 1110, so that the second support member 1130 is in a support-fit state with the electrode core 500, and the connection portion 1110 is supported by using the second support member 1130, thereby improving the stability of the connection portion 1110 during movement and / or deformation, and as a result the connection portion 1110 can be effectively moved and / or deformed to change the height of the connection portion 1110, that is, the height of the second current collector plate 100 can be adjusted, and as a result the electrical connection between the electrode core 500 and the bottom cover 300 is achieved by using the second current collector plate 100.

[0433] In a specific example, when a second current collector plate 100 is used to connect the bottom cover 300 and the electrode core 500, in the step of attaching the bottom cover 300 after the first support member 1120 and the electrode core 500 have been connected, the connecting portion 1110 is configured to be movable and / or deformable relative to the first support member 1120. Therefore, once the connecting portion 1110 is connected to the bottom cover 300, it can be ensured that the position of the connecting portion 1110 can change according to the position, shape, surface structure, etc., of the bottom cover 300. In addition, when the position of the connecting portion 1110 changes according to the position, shape, surface structure, etc., of the bottom cover 300, the connecting portion 1110 may slide the second support member 1130 radially toward the electrode core 500. As a result, the connecting portion 1110 can move and / or deform stably, and the connecting portion 1110 can be effectively connected to the bottom cover 300, thereby ensuring connection strength and connection area. In addition, a second current collector plate 100 is used to connect the bottom cover 300 and the electrode core 500, thereby reducing the possibility of welding defects between the second current collector plate 100 and the bottom cover 300.

[0434] In this application, it should be further emphasized that the relative positions of the first support member 1120 and the connecting portion 1110 are creatively arranged so that the second current collector plate 100 has a specific height. In this way, an electrical connection between the electrode core 500 and the bottom cover 300 can be achieved without bending the second current collector plate 100, thereby reducing the bending process, improving assembly efficiency, avoiding stress concentration caused by bending the second current collector plate 100, and preventing its breakage, thereby extending the service life of the second current collector plate 100.

[0435] In addition, since there is no need to bend the second current collector plate 100, the space occupied in the height direction by the second current collector plate 100 can be further reduced. Thus, when the second current collector plate 100 is used to connect the electrode core 500 to the bottom cover 300, the height of the space secured between the electrode core 500 and the bottom cover 300 may be reduced, that is, the height of the electrode core 500 may be increased, thereby improving the capacity of the electrode core 500 and further improving the capacity of the battery cell 1000.

[0436] As described above, in this application, the relative positions between the connecting portion 1110 and the first support member 1120 are creatively arranged, and the electrical connection between the electrode core 500 and the bottom cover 300 is achieved by using the second current collector plate 100, eliminating the need to bend the structure of the second current collector plate 100, thereby improving connection efficiency, increasing the capacity of the electrode core 500, extending the service life of the second current collector plate 100, and improving the structural strength of the second current collector plate 100. In addition, the second current collector plate 100 can absorb manufacturing errors that occur in the height direction during the manufacturing process, thereby further ensuring a reduction in the possibility of welding defects.

[0437] Compared with related technologies, the second current collector plate 100 of this application effectively absorbs height errors in the manufacturing process, the structure of the second current collector plate 100 remains stable during movement and / or deformation, and as a result, the second current collector plate 100 can be used to achieve electrical connection between the bottom cover 300 and the electrode core 500, thereby improving the reliability of the battery cell 1000.

[0438] Optionally, the material of the second current collector plate 100 may be an aluminum alloy, pure copper, nickel-plated copper, etc. As a result, the second current collector plate 100 has a conductive function, and consequently, by using the second current collector plate 100, the electrode core 500 is electrically connected to the bottom cover 300.

[0439] If the material of the second current collector plate 100 is an aluminum alloy, the second current collector plate 100 is mainly mated and connected to the positive electrode tab of the electrode core 500. If the material of the second current collector plate 100 is pure copper or nickel-plated copper, the second current collector plate 100 is mainly mated and connected to the negative electrode tab of the electrode core 500. That is, a person skilled in the art may select the material of the second current collector plate 100 based on the application environment of the second current collector plate 100. This is not particularly limited in this application.

[0440] Optionally, the aforementioned connection may be made by laser welding or by bonding with a conductive adhesive.

[0441] In the description of this application, the features defined by “first” and “second” may include one or more such features, either explicitly or implicitly, and are used to distinguish and describe features rather than to indicate order or importance.

[0442] In some examples, the second current collector plate 100 is an integrally formed component. Thus, the entire second current collector plate 100 may be manufactured using an integral molding process, thereby reducing the difficulty of manufacturing the second current collector plate 100, improving manufacturing efficiency, ensuring connection strength and quality between the first support member 1120, the second support member 1130, and the connecting portion 1110, stabilizing the structure of the second current collector plate 100, and electrically connecting the electrode core 500 to the bottom cover 300 by using the second current collector plate 100.

[0443] It should be noted that in the process of manufacturing the second current collector plate 100, the second current collector plate 100 may be cut, punched out, or otherwise modified to form structures such as the first support member 1120, the second support member 1130, and the connecting portion 1110 on the second current collector plate 100.

[0444] In some embodiments of this application, as shown in Figures 30 to 43, a notch 1131 is located on the outer edge of the second support member 1130, and the notch 1131 penetrates the second support member 1130 in the thickness direction. In this specification, the outer edge of the second support member 1130 may be understood as the side edge of the second support member 1130 away from the connector 1110 in order to avoid the notch 1131 affecting the fixed connection between the second support member 1130 and the connector 1110. The notch 1131 is used to reduce the area of ​​the second support member 1130 and reduce the contact area between the second support member 1130 and the electrode core 500. Thus, when the connecting portion 1110 moves and / or deforms relative to the first support member 1120, it can be ensured that the connecting portion 1110 can effectively change the position of the second support member 1130 relative to the electrode core 500, and as a result, the height of the connecting portion 1110 becomes adjustable.

[0445] In other words, the notch 1131 is provided to prevent the second support member 1130 from hindering the movement and / or deformation of the connection portion 1110 relative to the first support member 1120, thereby making the height of the connection portion 1110 adjustable and thus solving the problem of welding defects caused by manufacturing errors.

[0446] In addition, the notch 1131 is provided on the outer edge of the second support member 1130, and the notch 1131 further ensures that communication is established between the two opposing sides of the second support member 1130, thereby allowing the gas within the electrode core 500 to flow smoothly. That is, the notch 1131 may further form an exhaust port.

[0447] Optionally, as shown in Figures 30 to 43, a plurality of notches 1131 are provided on the outer edge of the second support member 1130, and the plurality of notches 1131 are evenly spaced apart from each other in the circumferential direction of the second support member 1130. The plurality of notches 1131 cooperate to ensure that the connection portion 1110 can effectively change the relative position of the second support member 1130 with respect to the electrode core 500, and further ensure that the gas distribution within the electrode core 500 can be made more uniform.

[0448] The number of notches 1131 can be selected from 2 to 20. In this way, when multiple notches 1131 are arranged on the outer edge of the second support member 1130, the area of ​​the second support member 1130 can be guaranteed, and as a result, the second support member 1130 can cooperate effectively with the electrode core 500.

[0449] It should be noted that the notch 1131 shown in Figure 35 is formed in a shape similar to a rectangle. In some other examples, the notch 1131 may be formed in a circular, triangular, or the like alternatively. This is not particularly limited in this application.

[0450] Optionally, as shown in Figures 31, 34, and 37, a discharge hole 1140 is positioned in the connection between the connecting portion 1110 and the first support member 1120, and the discharge hole 1140 is configured to further ensure that gas can flow smoothly within the electrode core 500.

[0451] In other words, in this application, not only is discharge performed by using the notch 1131, but a discharge hole 1140 is also provided separately. The notch 1131 works in cooperation with the discharge hole 1140 to ensure that the gas inside the electrode core 500 can be smoothly discharged, thereby ensuring the quality of the electrode core 500.

[0452] In addition, the discharge hole 1140 is provided in the connection between the connecting portion 1110 and the first support member 1120, and the connection area between the connecting portion 1110 and the first support member 1120 may be further reduced, thereby ensuring that the connecting portion 1110 can be effectively moved and / or deformed relative to the first support member 1120, thereby changing the height of the connecting portion 1110.

[0453] Optionally, as shown in Figures 31, 34, and 37, there are multiple discharge holes 1140, which are spaced apart from each other in the circumferential direction of the first support member 1120 to further ensure a uniform distribution of gas within the electrode core 500.

[0454] By choice, as shown in Figures 30 to 43, the notch 1131 extends to the connecting portion 1110, separating the second support member 1130 into multiple spaced portions. Furthermore, the area of ​​the second support member 1130 is reduced, resulting in a reduced contact area between the second support member 1130 and the electrode core 500. As the connecting portion 1110 moves and / or deforms relative to the first support member 1120, the connecting portion 1110 can effectively change the position of the second support member 1130 relative to the electrode core 500, and as a result, the height of the connecting portion 1110 becomes adjustable.

[0455] In the description of this application, unless otherwise specified, “multiple” means two or more.

[0456] In some embodiments of this application, the radial width range of the second support member 1130 is 1 mm to 10 mm.

[0457] In this specification, the radial width of the second support member 1130 may be understood as the width to which the second support member 1130 extends radially of the circular second current collector plate when the second current collector plate 100 is formed as a circular second current collector plate. If the radial width of the second support member 1130 is less than 1 mm, the structural strength of the second support member 1130 is reduced, the service life of the second support member 1130 is shortened, and the contact area between the second support member 1130 and the electrode core 500 becomes relatively small. In this case, the second support member 1130 cannot effectively support the connector 1110, and there is a risk that the second support member 1130 will be inserted into the electrode core 500. As a result, the safety of use of the electrode core 500 is reduced, and the second support member 1130 cannot slide relative to the electrode core 500, i.e., the connector 1110 cannot move and / or deform effectively. If the radial width of the second support member 1130 is greater than 10 mm, the manufacturing cost of the second support member 1130 increases, and assuming that the radius of the second current collector plate 100 is fixed, the area of ​​the connection portion 1110 decreases.

[0458] Therefore, in this application, the radial width range of the second support member 1130 is set to 1 mm to 10 mm, thereby ensuring the structural strength of the second support member 1130, preventing the second support member 1130 from being inserted into the electrode core 500, reducing the manufacturing cost of the second support member 1130, and ensuring the effective connection area of ​​the connection portion 1110.

[0459] The radial width of the second support member 1130 in this specification may be understood as W5 as shown in Figures 31 and 33.

[0460] In a specific example, the radial width of the second support member 1130 may be 1 mm, 3 mm, 5 mm, 7 mm, or 10 mm.

[0461] In some embodiments of this application, as shown in Figures 34, 35, and 36, a portion of the second support member 1130 is formed into a bent portion that is bent toward the first surface 1111. That is, a portion of the structure of the second support member 1130 forms a bent portion that is bent toward the first surface 1111, and as a result, the second support member 1130 forms an arc-shaped member. The second support member 1130 ensures that it can effectively stop-fit ​​with the electrode core 500, while the bent portion further reduces the contact area between the second support member 1130 and the electrode core 500, thereby reducing the frictional force between the second support member 1130 and the electrode core 500, thereby ensuring that the second support member 1130 can effectively slide relative to the electrode core 500 under external force, that is, ensuring that the connecting portion 1110 can effectively move and / or deform relative to the first support member 1120, thereby changing the height of the connecting...

Claims

1. The enclosure (600) and An electrode core (500) wherein a first tab (501) is positioned at the end of the electrode core (500) in a first direction, and the electrode core (500) is positioned within the housing (600), A first current collector plate (200) and a conductive pillar (41) are positioned at the end of the first tab (501) and at the end away from the electrode core (500), wherein the first current collector plate (200) is constructed in a flat plate shape and the first current collector plate (200) is electrically connected to the conductive pillar (41) and the first tab (501). A battery cell (1000) equipped with [the following].

2. The first current collector plate (200) is A plate body (210) is provided with an intermediate section (2100) and a connecting slot (211), the connecting slot (211) penetrates the plate body (210) in the thickness direction of the plate body (210), the orthographic projection of the outer peripheral wall of the plate body (210) onto a first projection plane lies on a first ring, the first projection plane is perpendicular to the first direction, the connecting slot (211) is located radially outward of the intermediate section (2100) in the radial direction of the plate body (210), and the intermediate section (2100) is electrically connected to the conductive pillar (41), A connecting sheet (220) located within the connecting slot (211), electrically connected to the plate body (210) via a bridge edge (221), and electrically connected to the first tab (501), wherein the orthographic projection of the bridge edge (221) onto the first projection plane is located radially inward of the outer peripheral edge of the orthographic projection of the connecting sheet (220) in the radial direction of the plate body (210) and A battery cell (1000) according to claim 1, comprising the above.

3. The battery cell (1000) according to claim 2, wherein the outer peripheral wall of the connection slot (211) is spaced apart from the outer peripheral wall of the plate body (210) in the radial direction of the plate body (210).

4. The battery cell (1000) according to claim 2 or 3, wherein the plate body (210) is provided with an opening that extends to the outer peripheral wall of the plate body (210) and defines the connection slot (211).

5. A plurality of side walls are provided in the connection slot (211), and among the plurality of side walls, the side wall that is positioned in the radial direction of the plate body (210) opposite the outer peripheral wall of the plate body (210) is defined as the outer edge side wall (2113). The battery cell (1000) according to claim 3 or 4, wherein the plurality of side walls further comprises a first connecting side wall (2111) and a second connecting side wall (2112), and both ends of the outer edge side wall (2113) are connected to the first connecting side wall (2111) and the second connecting side wall (2112), respectively, in the circumferential direction of the plate body (210), and at least one of the first connecting side wall (2111) and the second connecting side wall (2112) is connected to the bridge edge (221).

6. The battery cell (1000) according to claim 5, wherein the plate body (210) is provided with a plurality of connection slots (211), the connection sheet (220) is placed in each connection slot (211), and each of the plurality of connection sheets (220) is connected to a corresponding first connection side wall (2111) in the circumferential direction of the plate body (210) via the bridge edge (221).

7. A battery cell (1000) according to any one of claims 2 to 6, wherein the length of the bridge edge (221) in the radial direction of the plate body (210) is 0.5 mm to 30 mm.

8. The battery cell (1000) according to any one of claims 2 to 7, wherein the intermediate section (2100) is a central hole (212) that penetrates the plate body (210) in the thickness direction.

9. A cover plate (44) is fixed to the end of the housing (600) and to the end close to the first current collector plate (200), A separator (45) is positioned between the first current collector plate (200) and the cover plate (44). Furthermore, A battery cell (1000) according to any one of claims 1 to 8, wherein a first limiting portion is provided on the first current collector plate (200), a second limiting portion is provided on the separator (45), and the first limiting portion and the second limiting portion cooperate to limit the separator (45).

10. The battery cell (1000) according to claim 9, wherein one of the first limiting portion and the second limiting portion is a limiting notch (213) and the other is a limiting projection (454), and the limiting projection (454) extends into the limiting notch (213).

11. The battery cell (1000) according to claim 9 or 10, wherein there are a plurality of first limiting portions arranged spaced apart from each other in the circumferential direction of the first current collector plate (200), and a plurality of second limiting portions, and the plurality of first limiting portions cooperate with the plurality of second limiting portions in a one-to-one correspondence.

12. A cover plate (44) is fixed to the end of the housing (600) and to the end close to the first current collector plate (200), A separator (45) is positioned between the first current collector plate (200) and the cover plate (44). Furthermore, A battery cell (1000) according to any one of claims 1 to 11, wherein the first current collector plate (200) is provided with a welding region (216) electrically connected to the first tab (501), and the separator (45) is provided with a avoidance region (453), the avoidance region (453) is provided opposite the welding region (216) so as to expose the welding region (216).

13. The battery cell (1000) according to claim 12, wherein the first current collector plate (200) comprises a plate body (210), a bridge edge (221), and a plurality of connecting sheets (220), the plate body (210) is provided with a plurality of spaced-apart connecting slots (211), each connecting sheet (220) is connected to the inner wall of one of the connecting slots (211) via the bridge edge (221), and each connecting sheet (220) defines the welding area (216).

14. The separator (45) The central portion (451) is provided with a first support surface (4512) that supports the cover plate (44), A plurality of extension arms (452) are arranged within the central portion (451) and spaced apart from each other in the circumferential direction of the central portion (451), wherein the avoidance region (453) is defined between adjacent extension arms (452) and A battery cell (1000) according to claim 12 or 13, comprising the above.

15. The battery cell (1000) according to claim 13, wherein the separator (45) is provided with a plurality of avoidance regions (453), and the plurality of avoidance regions (453) are provided in a one-to-one correspondence with the plurality of connection slots (211) in the first direction.

16. The battery cell (1000) according to claim 14, wherein the central portion (451) is formed in a disc shape, the outer diameter of the central portion (451) is Dcn, the orthogonal projection of the outer peripheral wall of the separator (45) onto a first plane lies on the same circle, the outer diameter of the separator (45) is Dcw, the separator (45) satisfies the following relationship: 0.85 * Dcw ≥ Dcn ≥ 0.4 * Dcw, and the first plane is provided perpendicular to the thickness direction of the separator (45).

17. The battery cell (1000) according to claim 14, wherein the ratio of the total area of ​​the avoidance region (453) to the area of ​​the circular region on which the avoidance region (453) is provided on the separator (45) is S2, and satisfies 0.35 ≤ S2 ≤ 0.

9.

18. The battery cell (1000) according to claim 14, wherein the separator (45) further comprises a flange (455), the flange (455) being connected to the ends of the plurality of extension arms (452) and extending away from the first support surface (4512).

19. A battery cell (1000) according to any one of claims 12 to 18, further comprising a metal connecting member (43), wherein the first end of the conductive pillar (41) is electrically connected to the intermediate section (2100) of the first current collector plate (200), the second end of the conductive pillar (41) is electrically connected to the metal connecting member (43), a first insulating member (46) is disposed between the metal connecting member (43) and the cover plate (44), and a second insulating member (47) is disposed between the conductive pillar (41) and the cover plate (44).

20. The battery cell (1000) according to claim 19, wherein the intermediate section (2100) is formed in a central hole (212) that penetrates the first current collector plate (200) in the thickness direction, the first end is located within the central hole (212), and the outer peripheral wall of the first end is welded to the inner wall of the central hole (212).

21. The battery cell (1000) according to claim 20, wherein the conductive pillar (41) extends in the first direction, the metal connecting member (43), the cover plate (44), and the separator (45) are sleeved continuously on the conductive pillar (41) in the first direction, the second end is deformed under pressure, and as a result, at least a portion of the second end is located on the side of the metal connecting member (43) away from the first current collector plate (200) and in contact with the metal connecting member (43).

22. The battery cell (1000) according to claim 20, wherein an assembly hole (6201) is provided at the end of the housing (600) that is close to the first current collector plate (200), and the cover plate (44) seals the assembly hole (6201).

23. The battery cell (1000) according to claim 20, wherein the cover plate (44) comprises a plate body (441) and a first stopper (442), the first stopper (442) is located on the outer peripheral edge of the plate body (441), the first stopper (442) is located inside the housing (600) in contact with the inner wall of the housing (600), the first stopper (442) is fixed to the housing (600), and the plate body (441) is sleeve-mounted on the conductive pillar (41).

24. A cover plate (44) is fixed to the end of the housing (600) and to the end close to the first current collector plate (200), A separator (45) is positioned between the first current collector plate (200) and the cover plate (44), A heat-shrinkable insulating film (30) that encloses at least a portion of the outer peripheral wall of the electrode core (500) and a portion of the separator (45), wherein the cover plate (44) is exposed to the heat-shrinkable insulating film (30), and A battery cell (1000) according to any one of claims 1 to 23, further comprising the above.

25. The second tab (502) is positioned at the other end of the electrode core (500) in the first direction, The battery cell (1000) further comprises a second current collector plate (100) and a bottom cover (300), the bottom cover (300) being fixed to the end of the housing (600) and the end closest to the second tab (502), and the second current collector plate (100) being positioned between the second tab (502) and the bottom cover (300), The second current collector plate (100) comprises a first connection region (120) and a second connection region (130) connected to each other, the first connection region (120) being electrically connected to the second tab (502), and the second connection region (130) being electrically connected to the bottom cover (300) by contact. The battery cell (1000) according to any one of claims 1 to 24, wherein the first connection region (120) and the second connection region (130) have a difference in height and are movable relative to each other in the first direction.

26. The first connection region (120) comprises an intermediate portion (122) and a plurality of first connection portions (121), the plurality of first connection portions (121) are arranged continuously in the circumferential direction of the intermediate portion (122) and are individually connected to the intermediate portion (122), The battery cell (1000) according to claim 25, wherein the second connection region (130) comprises a second connection portion (131), the second current collector plate (100) further comprises a connecting member (140), the connecting member (140) is connected between the second connection portion (131) and the intermediate portion (122), the connecting member (140) extends inclined toward the second connection portion (131) relative to the intermediate portion (122), and as a result, the first connection region (120) and the second connection portion (131) have a difference in height.

27. The battery cell (1000) according to claim 26, wherein the orthographic projection of the outer peripheral wall of the second current collector plate (100) onto the first plane is located on a circle, the first plane is perpendicular to the thickness direction of the second current collector plate (100), a plurality of connecting members (140) are present, and the plurality of first connecting portions (121) and the plurality of connecting members (140) are alternately arranged spaced apart from each other in the circumferential direction of the first connecting region (120).

28. The battery cell (1000) according to claim 26, wherein the orthographic projection of the outer peripheral wall of the second current collector plate (100) onto the first plane is located on a circle, the first plane is perpendicular to the thickness direction of the second current collector plate (100), the second connection portion (131) is provided with a stop projection (1313) extending toward the first connection portion (121), the stop projection (1313) is located radially outward of the first connection portion (121), and the stop projection (1313) is located radially outward of the second tab (502).

29. The battery cell (1000) according to claim 26, wherein the first connection portion (121) has a first surface connected to the electrode core (500), and the second connection portion (131) has a second surface connected to the bottom cover (300), and the first surface is parallel to the second surface.

30. The straight-line distance between opposing side walls at the connection between the first connection portion (121) and the intermediate portion (122) is the connection width H, and the following relationship: nKHδ≧C is satisfied. The battery cell (1000) according to claim 26, wherein C is the minimum current flow requirement of the electrode core (500), n is the number of first connection portions (121), δ is the thickness of the first connection portions (121), and K is the current flow coefficient of the second current collector plate (100).

31. The battery cell (1000) according to claim 26, wherein the orthographic projection of the outer peripheral wall of the second current collector plate (100) onto the first plane lies on the first circle, the first plane is perpendicular to the thickness direction of the second current collector plate (100), the second connection portion (131) extends in the circumferential direction of the intermediate portion (122) and is located on the side of the first connection region (120), the first connection portion (121) is spaced apart from the inner peripheral wall of the second connection portion (131) to form a space gap, and the range of values ​​for the radius dimension G1 of the orthographic projection of the space gap onto the first plane is 0.5 mm to 2 mm.

32. The battery cell (1000) according to claim 26, wherein the area of ​​the orthographic projection of each first connection portion (121) onto the first plane is S1, the minimum connection area between each first connection portion (121) and the electrode core (500) is S, the following relationship: S ≥ 20% of S1 is satisfied, and the thickness direction of the second current collector plate (100) is perpendicular to the first plane.

33. The first connection region (120) comprises an intermediate portion (122) and a plurality of first connection portions (121), the plurality of first connection portions (121) are continuously arranged in the circumferential direction of the intermediate portion (122), individually connected to the intermediate portion (122), spaced apart from each other, and surrounding the circularly formed first connection region (120), A battery cell (1000) according to any one of claims 25 to 32, wherein the second connection region (130) comprises a plurality of second connection portions (131), the second current collector plate (100) further comprises a connecting member (140), each second connection portion (131) is connected to the first connection region (120) via the connecting member (140), and the connecting member (140) is constructed to be movable relative to the first connection region (120) or deformable relative to the first connection region (120) to change the height difference between the first connection region (120) and the second connection region (130).

34. The battery cell (1000) according to claim 33, wherein the connecting member (140) is a plate body (441) that extends inclined with respect to the first connecting region (120) and is movable or deformable relative to the first connecting region (120).

35. The battery cell (1000) according to claim 34, wherein the plurality of first connecting portions (121) and the plurality of connecting members (140) are alternately arranged in the circumferential direction of the intermediate portion (122).

36. The plurality of second connecting portions (131) are arranged spaced apart from each other in the circumferential direction of the first connecting region (120), and the minimum distance G3 between two adjacent second connecting portions (131) satisfies the following condition: 1 mm ≤ G3 ≤ ΠR1 / n2. The battery cell (1000) according to claim 33, wherein R1 is the radius of the second current collector plate (100) and n2 is the number of regions between the plurality of second connection portions (131).

37. The second tab (502) is positioned at the other end of the electrode core (500) in the first direction, The battery cell (1000) further comprises a second current collector plate (100) and a bottom cover (300), the bottom cover (300) being fixed to the end of the housing (600) and the end closest to the second tab (502), and the second current collector plate (100) being positioned between the second tab (502) and the bottom cover (300), The orthographic projection of the outer peripheral wall of the second current collector plate (100) onto the first projection plane is located on the first ring, the first projection plane is perpendicular to the thickness direction of the second current collector plate (100), and the second current collector plate (100) is, A connecting portion (1110), wherein the first surface (1111) of the connecting portion (1110) abuts against the bottom cover (300) and is electrically connected, A first support member (1120) and a second support member (1130) are located on the side of the connection portion (1110) and away from the first surface (1111), wherein the first support member (1120) is connected to the radially inward side of the connection portion (1110) and electrically connected to the second tab (502), and the second support member (1130) is connected to the radially outward side of the connection portion (1110) and supports the electrode core (500), and the connection portion (1110) is constructed to be movable or deformable relative to the first support member (1120). A battery cell (1000) according to any one of claims 1 to 36, comprising:

38. The battery cell (1000) according to claim 37, wherein a notch (1131) is provided on the outer edge of the second support member (1130), and the notch (1131) penetrates the second support member (1130) in the thickness direction.

39. The battery cell (1000) according to claim 37, wherein a part of the second support member (1130) is formed in a bent portion that is bent toward the first surface (1111).

40. The first support member (1120) is connected to the connecting portion (1110) via the first connecting plate (1152), and the first connecting plate (1152) extends inclined with respect to the first support member (1120). The battery cell (1000) according to claim 37, wherein the second support member (1130) comprises a second connecting plate (1151) that extends inclined, and the second support member (1130) is connected to the connecting portion (1110) via the second connecting plate (1151).

41. The battery cell (1000) according to claim 37, wherein the connection portion (1110) comprises a plurality of connection positions (1113) arranged spaced apart from each other in the circumferential direction, and a part of the first support member (1120) is positioned between any two adjacent connection positions (1113).

42. The battery cell (1000) according to claim 37, wherein the first support member (1120) is provided with a flow guidance zone (1128), the flow guidance zone (1128) comprises a plurality of spaced-apart flow guidance holes (1122), each flow guidance hole (1122) is formed as an arc-shaped hole, and a plurality of flow guidance zones (1128) exist, with a plurality of arc-shaped holes corresponding to each flow guidance zone (1128) continuously arranged in the radial direction of the first support member (1120).

43. A battery cell (1000) according to claim 42, wherein a part of the first support member (1120) is recessed in a direction away from the first surface (1111) to define a welding zone (1126), and the flow guidance zone (1128) is provided on the first support member (1120) at a position other than the welding zone (1126).

44. The bottom cover (300) is A battery cell (1000) according to claim 25, comprising a bottom cover body (310), wherein an annular first welding groove (314) is positioned on the end face of the bottom cover body (310) and away from the housing (600), the first welding groove (314) is recessed toward the second current collector plate (100), the first welding groove (314) is welded to the second connection area (130) for electrical connection, the first welding groove (314) is spaced apart from the outer peripheral edge of the bottom cover body (310), and the outer peripheral edge of the bottom cover body (310) is welded to the housing (600).

45. A battery cell (1000) according to claim 44, wherein a part of the bottom cover body (310) protrudes toward the second current collector plate (100) to define a first welded projection (313), and the first welded groove (314) is provided opposite the first welded projection (313).

46. The battery cell (1000) according to claim 44, wherein the bottom cover body (310) has a stepped portion (318), the stepped portion (318) is located outside the first welding groove (314), and the stepped portion (318) is in an overlapping fit with the end of the housing (600).

47. The battery cell (1000) according to claim 44, wherein the bottom cover body (310) is provided with a plurality of spaced-apart reinforcing regions (311), each reinforcing region (311) is defined by causing a part of the bottom cover body (310) to protrude toward the second current collector plate (100), a discharge passage (312) is defined between adjacent reinforcing regions (311) in the first direction, the discharge passage (312) extends toward a region on the bottom cover body (310) and a region used to attach an explosion-proof assembly (320), and the explosion-proof assembly (320) is constructed to open and release gas under a predetermined pressure.

48. The battery cell (1000) according to any one of claims 1 to 47, wherein the battery cell (1000) is a cylindrical battery.

49. Casing (3000) and, A battery cell (1000) according to any one of claims 1 to 48 and A battery pack (2000) comprising a plurality of battery cells (1000) arranged within the casing (3000).

50. A power consumption device (4000) comprising a battery pack (2000) according to claim 49 or a battery cell (1000) according to any one of claims 1 to 48.

Images