Battery cell, battery, battery module, battery pack, and electric device

Abstract

An electric device (4000). The electric device (4000) comprises a battery pack (3000). The battery pack (3000) comprises a battery module (2000) or a battery (1000). The battery module (2000) comprises the battery (1000). The battery (1000) comprises a battery cell (100). The battery cell (100) comprises a cell core (1), a first current collecting member (2), and a second current collecting member (3). One end of the cell core (1) is provided with a first tab (11) and a second tab (12). The first current collecting member (2) is arranged at said end of the cell core (1), and the first current collecting member (2) is connected to the first tab (11). The second current collecting member (3) is arranged at said end of the cell core (1), the second current collecting member (3) is connected to the second tab (12), and at least one of the second current collecting member (3) and the first current collecting member (2) is a single-layer structural member.

Description

Battery cells, batteries, battery modules, battery packs and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on December 29, 2023, with application number 202323666406.7 and titled “Battery Cells, Batteries, Battery Modules, Battery Packs and Electrical Devices,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of vehicle technology, and in particular to a battery cell, a battery, a battery module, a battery pack and an electrical device. Background Art

[0004] As the core component of power batteries, battery cells play a significant role in them. They determine the quality of power batteries and, of course, the battery life and capacity of vehicles.

[0005] In the prior art, a battery cell includes a tab and a current collector plate, which are connected to facilitate the smooth flow of current from the tab. Typically, the current collector plate has a complex structure and a long current flow path, resulting in a high impedance of the battery cell and inconvenience in normal use.

[0006] Public content

[0007] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a battery cell that reduces the structural impedance of the battery cell, facilitates the normal use of the battery cell, and improves the space utilization inside the battery cell.

[0008] The second objective of this application is to provide a battery using the above-mentioned battery cell.

[0009] The third object of this application is to provide a battery module using the above-mentioned battery.

[0010] The fourth object of the present application is to provide a battery pack using the above-mentioned battery or battery module.

[0011] The fifth objective of this application is to provide an electrical device using the above-mentioned battery pack.

[0012] According to the first aspect of the present application, the battery cell includes: a pole core, one end of which is provided with a first pole tab and a second pole tab; a first current collecting disk, the first current collecting disk is provided at the one end of the pole core, and the first current collecting disk is connected to the first pole tab; and a second current collecting disk, the second current collecting disk is provided at the one end of the pole core, and the second current collecting disk is connected to the second pole tab, and at least one of the second current collecting disk and the first current collecting disk is a single-layer structural component.

[0013] According to the battery cell of the present application, by configuring at least one of the second current collecting disc and the first current collecting disc as a single-layer structure, the current-carrying energy of the first pole lug or the second pole lug can directly pass through the second current collecting disc or the first current collecting disc along the thickness direction of the first current collecting disc or the second current collecting disc, respectively, thereby reducing the structural impedance of the battery cell, facilitating the normal use of the battery cell, and improving the performance of the battery cell. In addition, the single-layer structure is simple and uses less material, thereby reducing the production cost of the battery cell. In addition, the battery cell adopts the same-end lead-out, thereby improving the space utilization within the battery cell.

[0014] According to some embodiments of the present application, the first current collecting disk is located on a side of the first pole tab away from the pole core, and the second current collecting disk is located on a side of the second pole tab away from the pole core.

[0015] According to some embodiments of the present application, the second current collecting disc includes: a first connecting portion, through which the second current collecting disc is connected to the second pole tab; a second connecting portion, which is provided on a side of the first connecting portion away from the second pole tab; and a third connecting portion, which is connected to a side of the second connecting portion away from the first connecting portion.

[0016] According to some embodiments of the present application, the first connection portion and the third connection portion both extend in a direction perpendicular to the central axis of the pole core, and the second connection portion is vertically connected between the first connection portion and the third connection portion.

[0017] According to some embodiments of the present application, the first connection portion includes two first sub-connection portions arranged at intervals, each of the first sub-connection portions includes a first side and a second side, the first side and the second side are not on the same straight line, the first sides of the two first sub-connection portions are opposite to each other, and the second sides of the two first sub-connection portions are located on the same straight line; the second connection portion includes two second sub-connection portions arranged at intervals, one side of one of the second sub-connection portions is connected to the first side and the second side of one of the first sub-connection portions, and one side of the other second sub-connection portion is connected to the first side and the second side of the other first sub-connection portion; the third connection portion includes a third sub-connection portion and a fourth sub-connection portion, the third sub-connection portion is connected between the other side of the two second sub-connection portions opposite to the first side of the two first sub-connection portions, one side of the fourth sub-connection portion is connected to the other side of the two second sub-connection portions opposite to the second side of the two first sub-connection portions and the third sub-connection portion, and the other side of the fourth sub-connection portion extends in a direction away from the first connection portion.

[0018] According to some embodiments of the present application, the first side and the second side are perpendicular to each other.

[0019] According to some embodiments of the present application, the second current collecting plate is symmetrically arranged with respect to an extension direction of the third sub-connecting portion.

[0020] According to some embodiments of the present application, the minimum distance between the first connecting portion and the central axis of the pole core is d1, wherein d1 satisfies: 2mm≤d1≤7.7mm.

[0021] According to some embodiments of the present application, the first connection portion is located radially inward of the outer periphery of the pole core, and the distance between the first connection portion and the outer periphery of the pole core is d2, wherein d2 satisfies: 0.5mm≤d2≤2mm.

[0022] According to some embodiments of the present application, the second current collecting plate is a negative electrode current collecting plate, and the second current collecting plate is a stamped part made of steel or copper.

[0023] According to some embodiments of the present application, a connection protrusion is provided on a surface of one side of the first current collecting disk adjacent to the first electrode tab, and the first current collecting disk is connected to the first electrode tab via the connection protrusion.

[0024] According to some embodiments of the present application, the connecting protrusion includes a first protrusion portion and a second protrusion portion, one end of the first protrusion portion is connected to one end of the second protrusion portion, and the other end of the first protrusion portion and the other end of the second protrusion portion extend in a direction away from each other.

[0025] According to some embodiments of the present application, the angle between the first protrusion and the second protrusion is β, wherein β satisfies: 20°≤β≤80°.

[0026] According to some embodiments of the present application, one end of the first protrusion and one end of the second protrusion are adjacent to the center of the one end of the pole core, and the other end of the first protrusion and the other end of the second protrusion extend in a direction away from the center of the one end of the pole core and pass through the outer periphery of the first current collecting disk.

[0027] According to some embodiments of the present application, a notch is formed on an edge of the first current collecting plate away from the center of the one end of the pole core.

[0028] According to some embodiments of the present application, the notch is located between the other end of the first protrusion and the other end of the second protrusion.

[0029] According to some embodiments of the present application, the minimum distance between the connecting protrusion and the central axis of the pole core is d3, wherein d3 satisfies: 2mm≤d3≤8mm.

[0030] According to some embodiments of the present application, the connecting protrusion is formed by a portion of a side surface of the first current collecting plate away from the first electrode tab protruding toward a side surface adjacent to the first electrode tab.

[0031] According to some embodiments of the present application, the connecting protrusion forms a groove on the side surface of the first collecting plate away from the first pole tab to form the connecting protrusion on the side surface adjacent to the first pole tab, and the depth of the groove is h, wherein h satisfies: 0mm<h≤2mm.

[0032] According to some embodiments of the present application, the minimum distance between the side of the first collecting disk away from the central axis of the pole core and the outer peripheral surface of the pole core is d4, wherein d4 satisfies: 0.5mm≤d4≤2mm.

[0033] According to some embodiments of the present application, the first current collecting disc is a positive electrode current collecting disc, and the first current collecting disc is a stamped aluminum sheet.

[0034] According to some embodiments of the present application, the battery cell further includes: a cover plate assembly, wherein the cover plate assembly is provided on a side of the first current collecting plate away from the pole core.

[0035] According to some embodiments of the present application, the cover plate assembly includes: a cover plate body, the second current collecting plate is connected to the cover plate body; and a positive electrode pole, the positive electrode pole is passed through the cover plate body, the positive electrode pole is insulated and connected to the cover plate body, and the first current collecting plate is connected to the positive electrode pole.

[0036] According to some embodiments of the present application, the positive pole includes a first pole segment and a second pole segment connected to each other, and the first pole segment is passed through the cover body; the cover assembly further includes: an insulating separator, which is arranged between the cover body and the second pole segment.

[0037] According to some embodiments of the present application, a stop groove is formed on the insulating separator, and the second pole segment fits in the stop groove; a fitting portion extending toward the stop groove is provided on the first collecting plate, and the fitting portion fits in the stop groove, and the fitting portion is located on the side of the second pole segment away from the cover plate body.

[0038] According to some embodiments of the present application, a stop protrusion is provided on the side surface of the insulating separator adjacent to the first current collecting disk, and the stop protrusion and the side surface of the insulating separator adjacent to the first current collecting disk jointly define the stop groove, and the side of the stop groove adjacent to the center of the first current collecting disk is open.

[0039] According to some embodiments of the present application, the second current collecting plate is interference-fitted between the second electrode tab and the cover plate body.

[0040] According to some embodiments of the present application, the height of the second current collecting plate is h1, and the distance between the side surface of the cover body facing the first current collecting plate and the side surface of the first current collecting plate away from the cover body is h2, wherein h1 and h2 satisfy: 0mm≤h1-h2≤1mm.

[0041] The battery according to the second embodiment of the present application includes the battery cell according to the first embodiment of the present application.

[0042] The battery module according to the third embodiment of the present application includes the battery according to the above-mentioned second embodiment of the present application.

[0043] The battery pack according to the fourth embodiment of the present application includes the battery according to the above-mentioned second embodiment of the present application or the battery module according to the above-mentioned third embodiment of the present application.

[0044] An electrical device according to an embodiment of the fifth aspect of the present application includes a battery pack according to an embodiment of the fourth aspect of the present application.

[0045] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0047] FIG1 is a schematic diagram of a battery cell according to an embodiment of the present application;

[0048] FIG2 is an exploded view of a battery cell according to an embodiment of the present application;

[0049] FIG3 is a cross-sectional view of an end portion of a battery cell according to an embodiment of the present application;

[0050] FIG4 is a partial schematic diagram of a battery cell according to an embodiment of the present application, wherein the substrate is not shown;

[0051] FIG5 is a schematic diagram of a second current collecting disk of a battery cell according to an embodiment of the present application;

[0052] 6 is a top view of the assembly of the second current collecting disc, the first current collecting disc, and the pole core of the battery cell according to an embodiment of the present application;

[0053] 7 is a schematic diagram of the assembly of the cover plate assembly and the first current collecting plate of the battery cell according to an embodiment of the present application;

[0054] FIG8 is an exploded view of a cover plate assembly and a first current collecting plate of a battery cell according to an embodiment of the present application;

[0055] FIG9 is a schematic diagram of a first current collecting plate of a battery cell according to an embodiment of the present application;

[0056] FIG10 is a schematic diagram of a cover plate assembly of a battery cell according to an embodiment of the present application;

[0057] FIG11 is a schematic diagram of a battery cell according to an embodiment of the present application from another angle;

[0058] FIG12 is an exploded view of a battery cell according to an embodiment of the present application from another angle;

[0059] FIG13 is a schematic diagram of a sealing structure of a battery cell according to an embodiment of the present application;

[0060] FIG14 is a schematic block diagram of a battery according to an embodiment of the present application;

[0061] FIG15 is a schematic block diagram of a battery module according to an embodiment of the present application;

[0062] FIG16 is a schematic block diagram of a battery pack according to an embodiment of the present application;

[0063] FIG17 is another schematic block diagram of a battery pack according to an embodiment of the present application;

[0064] FIG18 is a schematic block diagram of an electric device according to an embodiment of the present application.

[0065] Reference numerals:

[0066] Power device 4000, battery pack 3000, battery module 2000, battery 1000,

[0067] Battery Cell 100,

[0068] Pole core 1, first pole ear 11, second pole ear 12, center hole 13,

[0069] The first collecting plate 2, the connecting protrusion 21, the first protrusion 211, the second protrusion 212, the notch 22, the groove 23, the matching portion 24,

[0070] The second current collecting plate 3, the first connecting portion 31, the first sub-connecting portion 311, the first side 3111, the second side 3112, the second connecting portion 32, the second sub-connecting portion 321, the third connecting portion 33, the third sub-connecting portion 331, the fourth sub-connecting portion 332,

[0071] Cover plate assembly 4, cover plate body 41, positive pole 42, first pole segment 421, second pole segment 422, insulating separator 43, anti-rotation groove 431, anti-rotation protrusion 432,

[0072] Shell 5, shell body 50, bottom cover 51, liquid injection hole 511, sealing structure 512, elastic sealing gasket 5121, sealing cover 5122,

[0073] A first insulating member 6 , a second insulating member 7 , a substrate 8 , and a separator 9 . DETAILED DESCRIPTION

[0074] The embodiments of the present application are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The battery cell 100 according to the first embodiment of the present application is described below with reference to Figures 1 to 13 .

[0075] As shown in FIG1 and FIG2 , the battery cell 100 according to the embodiment of the first aspect of the present application includes a pole core 1 , a first current collecting disc 2 and a second current collecting disc 3 .

[0076] Specifically, a first tab 11 and a second tab 12 are provided at one end of the core 1. For example, in the examples shown in Figures 1 and 2 , both the first tab 11 and the second tab 12 are located at the upper end of the core 1. The first tab 11 can be configured as the positive tab, and the second tab 12 can be configured as the negative tab. As a result, the battery cell 100 is connected to the same end, requiring only an exhaust channel at the aforementioned end of the core 1, thereby improving space utilization within the battery cell 100.

[0077] 2 , a first current collecting disc 2 is provided at the aforementioned end of the pole core 1 and is connected to the first pole tab 11. A second current collecting disc 3 is provided at the aforementioned end of the pole core 1 and is connected to the second pole tab 12. At least one of the second current collecting disc 3 and the first current collecting disc 2 is a single-layer structure. For example, in the example of FIG2 , both the first current collecting disc 2 and the second current collecting disc 3 are provided at the upper end of the pole core 1. The aforementioned configurations of the first current collecting disc 2 and the second current collecting disc 3 include the following: first, only the first current collecting disc 2 is a single-layer structure; second, only the second current collecting disc 3 is a single-layer structure; and third, both the first current collecting disc 2 and the second current collecting disc 3 are single-layer structures. "Single-layer structure" means that along the thickness direction of the structure, the structure itself has no bent or overlapping portions. That is, the first current collecting disc 2 itself is a single layer with no bent or overlapping portions, and the second current collecting disc 3 itself is a single layer with no bent or overlapping portions.

[0078] As a result, the current on the first electrode tab 11 can flow through the first current collecting disc 2 and out, and the current on the second electrode tab 12 can flow through the second current collecting disc 3. Furthermore, the current can directly pass through the first current collecting disc 2 or the second current collecting disc 3 along the thickness direction of the first current collecting disc 2 or the second current collecting disc 3, thereby shortening the flow path of the current and reducing the structural impedance of the battery cell 100. This is beneficial for the normal use of the battery cell 100 and improves the performance of the battery cell 100. Furthermore, the single-layer structural component has a simple structure and uses less material, thereby reducing the production cost of the second current collecting disc 3 and the first current collecting disc 2, and thus reducing the production cost of the battery cell 100.

[0079] According to the battery cell 100 of the present application, by configuring at least one of the second current collecting disc 3 and the first current collecting disc 2 as a single-layer structure, the current-carrying energy of the first pole tab 11 or the second pole tab 12 can directly pass through the first current collecting disc 2 or the second current collecting disc 3 along the thickness direction of the first current collecting disc 2 or the second current collecting disc 3, respectively, thereby reducing the structural impedance of the battery cell 100, facilitating the normal use of the battery cell 100, and improving the performance of the battery cell 100. In addition, the single-layer structure is simple and uses less material, thereby reducing the production cost of the battery cell 100. In addition, the battery cell 100 uses a same-end lead-out, thereby improving the space utilization within the battery cell 100.

[0080] According to some embodiments of the present application, referring to Figures 2 and 3 , the first current collecting disc 2 is located on the side of the first pole tab 11 away from the pole core 1, and the second current collecting disc 3 is located on the side of the second pole tab 12 away from the pole core 1. For example, in the examples of Figures 2 and 3 , the first current collecting disc 2 is disposed above the first pole tab 11, with the lower side of the first current collecting disc 2 connected to the upper side of the first pole tab 11. The second current collecting disc 3 is disposed above the second pole tab 12, with the lower side of the second current collecting disc 3 connected to the upper side of the second pole tab 12. This arrangement facilitates assembly of the first current collecting disc 2 with the first pole tab 11 and the second current collecting disc 3 with the second pole tab 12, thereby improving the assembly efficiency of the battery cell 100. Moreover, the rational layout of the pole core 1, the first current collecting disc 2, and the second current collecting disc 3 results in a higher degree of integration of the battery cell 100. In addition, after the battery cell 100 is installed, the second current collecting disc 3 and the first current collecting disc 2 are located at the ends of the pole core 1, which facilitates the detection of the second current collecting disc 3 and the first current collecting disc 2, thereby improving the detectability of the second current collecting disc 3 and the first current collecting disc 2.

[0081] Optionally, the second current collecting disc 3 is connected to the second pole tab 12 by welding, and the first current collecting disc 2 is connected to the first pole tab 11 by welding. For example, the second current collecting disc 3 is laser welded to the second pole tab 12, and the first current collecting disc 2 is laser welded to the first pole tab 11. This ensures a more secure connection between the second current collecting disc 3 and the second pole tab 12, and a more secure connection between the first current collecting disc 2 and the first pole tab 11, thereby preventing the second current collecting disc 3 from falling off the second pole tab 12 and the first current collecting disc 2 from falling off the first pole tab 11, thereby improving the connection stability between the first and second current collecting discs 2 and 3. Furthermore, compared to traditional torque welding, laser welding is used for connection, so the current flowing through the first and second current collecting discs 2 and 3 is unrestricted, and the welding cost is lower, thereby further reducing the production cost of the battery cell 100 and improving the welding yield and detectability of the battery cell 100. Furthermore, the welding method is simple, thereby improving the feasibility of the welding process.

[0082] According to some embodiments of the present application, referring to FIG. 5 , the second current collecting plate 3 includes a first connection portion 31 , a second connection portion 32 , and a third connection portion 33 .

[0083] Specifically, the second current collecting plate 3 is connected to the second electrode tab 12 via a first connecting portion 31. The second connecting portion 32 is located on a side of the first connecting portion 31 away from the second electrode tab 12, and the third connecting portion 33 is connected to a side of the second connecting portion 32 away from the first connecting portion 31. For example, in the example shown in FIG5 , the lower side of the first connecting portion 31 is connected to the upper side of the second electrode tab 12, the lower end of the second connecting portion 32 is connected to the upper side of the first connecting portion 31, and the lower side of the third connecting portion 33 is connected to the upper end of the second connecting portion 32. The first connecting portion 31 can be formed to protrude toward the second electrode tab 12, and the third connecting portion 33 can be formed to protrude away from the second electrode tab 12, with a height difference between the third connecting portion 33 and the first connecting portion 31. As a result, the first connecting portion 31 is connected to the second electrode tab 12 with a larger contact area, making the connection between the first connecting portion 31 and the second electrode tab 12 convenient and secure. In addition, the second connecting portion 32 acts as a reinforcing rib, supporting the first connecting portion 31 and the third connecting portion 33, thereby improving the structural strength of the second current collecting tray 3 and facilitating the long-term and stable use of the second current collecting tray 3. Furthermore, by strengthening the connection between the first connecting portion 31 and the second electrode tab 12, the connection between the third connecting portion 33 and other components of the battery cell 100 (such as the electrical lead-out member such as the cover body 41) is also strengthened to facilitate the current extraction from the second electrode tab 12. This improves the flatness of the connection between the second current collecting tray 3 and the second electrode tab 12, prevents the second current collecting tray 3 from collapsing when subjected to force, and further improves the performance of the second current collecting tray 3.

[0084] In conventional technology, the single-layer current collecting disc used is usually a flat sheet-shaped current collecting disc without reinforcing ribs. The flatness of the contact surface between the second current collecting disc and the second pole tab is poor, resulting in poor welding yield. In the solution of the present application, the first connecting portion 31 of the second current collecting disc 3 protrudes toward the second pole tab 12, and the third connecting portion 33 protrudes away from the second pole tab 12. The first connecting portion 31 is used to connect to the second pole tab 12, and the third connecting portion 33 is used to connect to the electrical lead-out member such as the cover plate body 41 to lead the current from the second pole tab 12. The second connecting portion 32 serves to strengthen the structural strength of the second current collecting disc 2, while supporting and strengthening the connection between the first connecting portion 31 and the second pole tab 12, as well as the connection with other electrical connectors, so that the connection between the second current collecting disc 3 and the second pole tab 12 is more flat and less likely to collapse when subjected to force.

[0085] According to some embodiments of the present application, referring to FIG5 , the first connection portion 31 and the third connection portion 33 both extend perpendicular to the central axis of the electrode core 1, and the second connection portion 32 is perpendicularly connected between the first connection portion 31 and the third connection portion 33. For example, in the example of FIG5 , the first connection portion 31 and the third connection portion 33 are parallel to the upper side of the second electrode tab 12, and the second connection portion 32 is perpendicular to the upper side of the second electrode tab 12. This arrangement improves the flatness of the second current collecting tray 3, thereby facilitating connection of the second current collecting tray 3 to other components of the battery cell 100 via the third connection portion 33. This improves the welding yield of the second current collecting tray 3 to other components of the battery cell 100, effectively prevents the second current collecting tray 3 from falling off the battery cell 100, and thereby enhances the operational stability of the second current collecting tray 3. Furthermore, the second current collecting tray 3 has a simple structure and is easily manufactured and processed, thereby improving the production efficiency and reducing the production cost of the second current collecting tray 3.

[0086] According to some embodiments of the present application, referring to FIG5 , the first connection portion 31 includes two first sub-connection portions 311 spaced apart from each other. Each first sub-connection portion 311 includes a first side 3111 and a second side 3112. The first side 3111 and the second side 3112 are not co-linear (i.e., the first side 3111 and the second side 3112 are arranged at an angle therebetween). The first side 3111 of the two first sub-connection portions 311 are opposite each other, and the second side 3112 of the two first sub-connection portions 311 are co-linear. For example, in the example of FIG5 , the two first sub-connection portions 311 are located on either side of the second connection portion 32. The first sub-connection portion 311 can be arranged in a fan shape, with the first side 3111 and the second side 3112 being the two straight edges of the fan shape. As a result, both first sub-connecting portions 311 can be connected to the second electrode tab 12, thereby improving the overall stability of the connection between the second current collecting disc 3 and the second electrode tab 12 and providing a secure connection, thereby preventing the second current collecting disc 3 from falling off the second electrode tab 12 and improving the performance of the battery cell 100. Furthermore, the two first sub-connecting portions 311 increase the contact area between the second current collecting disc 3 and the second electrode tab 12, thereby improving the connection strength between the second current collecting disc 3 and the second electrode tab 12 and reducing the structural impedance of the battery cell 100.

[0087] 5 , the second connection portion 32 includes two spaced-apart second sub-connection portions 321. One side of one of the second sub-connection portions 321 is connected to the first side edge 3111 and the second side edge 3112 of one of the first sub-connection portions 311, and one side of the other second sub-connection portion 321 is connected to the first side edge 3111 and the second side edge 3112 of the other first sub-connection portion 311. For example, in the example of FIG5 , the two second sub-connection portions 321 correspond one-to-one with the two first sub-connection portions 311. The two second sub-connection portions 321 are spaced apart along the arrangement direction of the two first sub-connection portions 311. The second sub-connection portions 321 can be arranged vertically and bend along the first side edge 3111 and the second side edge 3112, with the bend forming an arc-shaped transition. This configuration simplifies the structure of the second sub-connection portions 321, thereby simplifying the structure of the second current collecting tray 3, reducing the difficulty of manufacturing the second current collecting tray 3, and improving the production efficiency of the second current collecting tray 3. In addition, the structural strength of the second sub-connection portion 321 is enhanced, thereby further improving the supporting effect of the second connection portion 32 on the first connection portion 31 and the third connection portion 33 , thereby improving the structural strength of the second collecting plate 3 .

[0088] 5 , the third connection portion 33 includes a third sub-connection portion 331, which is connected to the other side of the two second sub-connection portions 321, opposite the first side edges 3111 of the two first sub-connection portions 311. For example, the lower surface of the third sub-connection portion 331 is connected to the upper side of the second sub-connection portion 321, opposite the first side edges 3111. The third sub-connection portion 331 can be connected between the two second sub-connection portions 321, with both sides of the third sub-connection portion 331 extending beyond the second sub-connection portions 321 along the width direction of the third sub-connection portion 331. Thus, the second current collecting tray 3 can be connected to the cover plate body 41 via the third sub-connection portion 331.

[0089] Furthermore, the third connection portion 33 includes a fourth sub-connection portion 332, one side of the fourth sub-connection portion 332 is connected to the other side of the two second sub-connection portions 321 opposite to the second side edges 3112 of the two first sub-connection portions 311 and the third sub-connection portion 331, and the other side of the fourth sub-connection portion 332 extends in a direction away from the first connection portion 31.

[0090] For example, in the example of FIG5 , the third connecting portion 33 is generally T-shaped, with the third sub-connecting portion 331 being the vertical segment of the T and the fourth sub-connecting portion 332 being the horizontal segment of the T. The widthwise sides of the third sub-connecting portion 331 are respectively connected to the sides of the two second sub-connecting portions 321 that are away from the two first side edges 3111 (i.e., the upper sides of the second sub-connecting portions 321 that are opposite the first side edges 3111). The plane in which the fourth sub-connecting portion 332 lies is parallel to the plane in which the first sub-connecting portion 311 lies. The side of the fourth sub-connecting portion 332 that faces the first connecting portion 31 is connected to the sides of the two second sub-connecting portions 321 that are away from the two second side edges 3112. Furthermore, the side of the fourth sub-connecting portion 332 that faces the first sub-connecting portion 311 is connected to the side of the third sub-connecting portion 331 that faces the fourth sub-connecting portion 332. With this arrangement, the two second sub-connecting portions 321 are connected together via the third sub-connecting portion 331, thereby connecting the second current collecting tray 3 into a single unit and improving the structural strength of the second current collecting tray 3. Furthermore, the provision of the fourth sub-connecting portion 332 increases the area of ​​the third connecting portion 33, thereby improving the connection stability between the upper surface of the second current collecting tray 3 and other components of the battery cell 100 when the second current collecting tray 3 is connected to them. Furthermore, the structure of the second current collecting tray 3 is simple, making it easier to produce, thereby improving the production efficiency of the second current collecting tray 3. Furthermore, the fourth sub-connecting portion 332 acts as a reinforcing rib, enhancing the strength and flatness of the second current collecting tray 3 and improving the welding yield.

[0091] According to some embodiments of the present application, referring to FIG5 , the first side 3111 and the second side 3112 are perpendicular to each other. For example, in the example of FIG5 , the two first sub-connecting portions 311 have substantially identical shapes, both roughly forming right-angled sectors. This arrangement simplifies the structure and reduces the processing difficulty of the two first sub-connecting portions 311, thereby increasing the production rate of the second current collecting tray 3. Furthermore, the two second sub-connecting portions 321 are roughly formed at right angles, further enhancing the supporting function of the two second sub-connecting portions 321 and, in turn, further improving the structural strength of the second current collecting tray 3.

[0092] According to some embodiments of the present application, referring to FIG5 , the second current collecting disc 3 is symmetrically arranged about the extension direction of the third sub-connecting portion 331 (i.e., the extension direction of the first side 3111). This arrangement positions the third sub-connecting portion 331 and the corresponding second sub-connecting portion 321 below the third sub-connecting portion 331 in the center of the second current collecting disc 3, further enhancing the reinforcing support provided by the second connecting portion 32. Consequently, under pressure, the second current collecting disc 3 is evenly stressed, preventing it from tipping over and tearing, thereby further enhancing the connection strength between the second current collecting disc 3 and the second electrode tab 12.

[0093] According to some embodiments of the present application, referring to FIG6 , the minimum distance between the first connection portion 31 and the central axis of the electrode core 1 is d1, where d1 satisfies the following: 2 mm ≤ d1 ≤ 7.7 mm. For example, in the example of FIG6 , the minimum distance between the second side 3112 and the central axis of the electrode core 1 is d1. For example, when the minimum distance between the first connection portion 31 and the central axis of the electrode core 1 is greater than 7.7 mm, the contact area between the first connection portion 31 and the second electrode tab 12 is small, thereby reducing the uniformity of the weld distribution and improving the structural impedance of the electrode core 1. When the minimum distance between the first connection portion 31 and the central axis of the electrode core 1 is less than 2 mm, the spacing between the first connection portion 31 and the first current collecting plate 2 is small, making it easy for the second current collecting plate 3 to contact the first current collecting plate 2, which can easily cause a short circuit between the second current collecting plate 3 and the first current collecting plate 2, thereby affecting the normal operation of the battery cell 100. Thus, by ensuring that the minimum distance d1 between the first connecting portion 31 and the central axis of the electrode core 1 satisfies the condition of 2 mm ≤ d1 ≤ 7.7 mm, the uniformity of the weld distribution at the connection between the first connecting portion 31 and the second electrode tab 12 is improved, thereby reducing the structural impedance of the electrode core 1. Furthermore, this prevents short circuits caused by contact between the second current collecting disc 3 and the first current collecting disc 2, thereby facilitating the long-term normal use of the battery cell 100.

[0094] According to some embodiments of the present application, referring to FIG6 , the first connection portion 31 is located radially inward of the outer periphery of the pole core 1 , and the distance between the first connection portion 31 and the outer periphery of the pole core 1 is d2 , where d2 satisfies the following: 0.5 mm ≤ d2 ≤ 2 mm. For example, when the distance d2 between the first connection portion 31 and the outer periphery of the pole core 1 is greater than 2 mm, the connection area between the first connection portion 31 and the second pole tab 12 is small, the connection stability between the second current collecting plate 3 and the second pole tab 12 is reduced, and the current flow is not conducive to the passage of the carrier, thereby increasing the structural impedance of the battery cell 100. When the distance d2 between the first connection portion 31 and the outer periphery of the pole core 1 is less than 0.5 mm, the first connection portion 31 is likely to contact the outer shell 5 provided on the outer periphery of the pole core 1 , causing the carrier current of the battery cell 100 to pass through the outer shell 5 , resulting in a higher structural impedance of the battery cell 100. Thus, by ensuring that the distance d2 between the first connecting portion 31 and the outer periphery of the electrode core 1 satisfies 0.5 mm ≤ d2 ≤ 2 mm, the connection area between the first connecting portion 31 and the second electrode tab 12 is large, the connection between the second current collecting plate 3 and the second electrode tab 12 is secure, and the structural impedance of the battery cell 100 is reduced. Furthermore, the first connecting portion 31 is effectively prevented from contacting the outer casing 5 of the battery cell 100, thereby preventing the current of the battery cell 100 from passing through the outer casing 5, further reducing the structural impedance of the battery cell 100.

[0095] According to some embodiments of the present application, the second current collecting disc 3 is a negative electrode current collecting disc, and the second current collecting disc 3 is a steel or copper stamped part. Steel has corrosion resistance and electrical conductivity, and copper has good ductility and high electrical conductivity. Therefore, when the second current collecting disc 3 is a steel part, it is conducive to the normal use of the second current collecting disc 3, and improves the structural strength of the second current collecting disc 3, which is conducive to the long-term and stable use of the second current collecting disc 3. In addition, when the second current collecting disc 3 is a copper stamped part, the copper stamping improves the flatness of the second current collecting disc 3, thereby improving the performance of the second current collecting disc 3, and the second current collecting disc 3 is easy to form, which reduces the production difficulty of the second current collecting disc 3, thereby helping to improve the production efficiency of the second current collecting disc 3.

[0096] According to some embodiments of the present application, referring to Figures 2 to 4 , a connection protrusion 21 is provided on a side surface of the first current collecting disc 2 adjacent to the first pole lug 11, and the first current collecting disc 2 is connected to the first pole lug 11 via the connection protrusion 21. For example, in the examples of Figures 2 to 4 , the connection protrusion 21 is formed by a portion of the first current collecting disc 2 protruding toward the first pole lug 11. With this arrangement, the first current collecting disc 2 is in contact with and connected to the first pole lug 11 via the connection protrusion 21, facilitating an interference fit between the first current collecting disc 2 and the first pole lug 11. This improves the welding yield when the first current collecting disc 2 is connected to the first pole lug 11 by welding, thereby increasing the connection strength between the first current collecting disc 2 and the first pole lug 11. In addition, the connection protrusion 21 has a simple structure, thereby simplifying the structure of the first current collecting disc 2 and facilitating mass production of the first current collecting disc 2.

[0097] 9 , the connecting protrusion 21 includes a first protrusion 211 and a second protrusion 212 , one end of the first protrusion 211 is connected to one end of the second protrusion 212 , and the other end of the first protrusion 211 and the other end of the second protrusion 212 extend away from each other.

[0098] For example, in the example of FIG. 9 , the connecting protrusion 21 can be configured in a "V" shape, with one end of the first protrusion 211 near the center of the first current collecting tray 2 connected to one end of the second protrusion 212 near the center of the first current collecting tray 2. The other ends of the first protrusion 211 and the other ends of the second protrusion 212 both extend away from the center of the first current collecting tray 2, and the first protrusion 211 and the second protrusion 212 are symmetrical about the centerline of the first current collecting tray 2. This configuration provides a simple and well-designed connecting protrusion 21. This improves the stability of the overall connection between the first current collecting tray 2 and the first electrode tab 11 after the first current collecting tray 2 is connected to the first electrode tab 11, preventing the first current collecting tray 2 from shaking or rotating, thereby improving the operational stability of the battery cell 100. Furthermore, the connecting protrusion 21 is easy to manufacture, thereby reducing the difficulty of manufacturing the first current collecting tray 2 and improving the production efficiency of the first current collecting tray 2.

[0099] According to some embodiments of the present application, referring to FIG. 9 , the angle β between the first protrusion 211 and the second protrusion 212 is β, where β satisfies the following: 20° ≤ β ≤ 80°. For example, when the angle β between the first protrusion 211 and the second protrusion 212 is greater than 80°, the distance between the other end of the first protrusion 211 and the other end of the second protrusion 212 is greater, resulting in a larger spacing between the weld points at the edge of the first current collecting tray 2, reducing the connection stability between the first current collecting tray 2 and the first tab 11 of the battery cell 100. When the angle β between the first protrusion 211 and the second protrusion 212 is less than 20°, the distance between the other end of the first protrusion 211 and the other end of the second protrusion 212 is smaller, and the distance between the opposite sides of the first protrusion 211 and the second protrusion 212 is smaller, reducing the uniformity of the distribution of the weld points on the first current collecting tray 2 and thus reducing the connection stability of the first current collecting tray 2. Therefore, by setting the angle β between the first protrusion 211 and the second protrusion 212 to satisfy 20°≤β≤80°, the position distribution of the first protrusion 211 and the second protrusion 212 is moderate, thereby improving the uniformity of the distribution of the welding points of the first collecting disc 2, and further improving the connection stability of the first collecting disc 2, which is beneficial to the long-term use of the first collecting disc 2.

[0100] According to some embodiments of the present application, referring to FIG9 , one end of the first protrusion 211 and one end of the second protrusion 212 are adjacent to the center of the one end of the electrode core 1, while the other ends of the first protrusion 211 and the other ends of the second protrusion 212 extend away from the center of the one end of the electrode core 1 and penetrate the outer periphery of the first current collecting plate 2. For example, in the example of FIG9 , the one end of the first protrusion 211 and the one end of the second protrusion 212 are connected. This arrangement increases the overlap area between the first protrusion 211 and the second protrusion 212 and the first electrode tab 11, thereby increasing the contact area and reducing the structural impedance of the battery cell 100. Furthermore, the simple structure of the first protrusion 211 and the second protrusion 212 facilitates the production of the connecting protrusion 21, thereby improving the production efficiency of the first current collecting plate 2. In addition, by arranging the ends of the first protrusion 211 and the second protrusion 212 that are away from each other to pass through the outer periphery of the first current collecting disk 2, the thickness of the edge of the first current collecting disk 2 is reduced, which is more conducive to the passage of current and further reduces the structural impedance.

[0101] According to some embodiments of the present application, referring to FIG9 , a notch 22 is formed on the central edge of the above-mentioned end of the first current collecting disc 2 away from the pole core 1. For example, in the example of FIG9 , the notch 22 is recessed toward the center of the first current collecting disc 2, and the notch 22 can be set in a semicircular shape. Therefore, when the first current collecting disc 2 is connected to the first pole tab 11 by laser welding, during the cooling process of the welded first current collecting disc 2, due to different thermal expansion coefficients, some areas of the first current collecting disc 2 shrink more than other areas, which will cause residual stress in the welding area. The provision of the notch 22 can alleviate the above-mentioned residual stress, thereby preventing the first current collecting disc 2 and the first pole tab 11 from being thermally deformed during welding and causing poor welding, thereby further improving the connection strength between the first current collecting disc 2 and the first pole tab 11.

[0102] According to some embodiments of the present application, referring to FIG9 , the notch 22 is located between the other end of the first protrusion 211 and the other end of the second protrusion 212. Thus, the notch 22 is reasonably positioned, approximately midway between the center edge of the one end of the first current collecting disc 2 away from the pole core 1. When the first current collecting disc 2 is welded to the first pole tab 11 via the first protrusion 211 and the second protrusion 212, the notch 22 can better relieve the residual stress, thereby further improving the welding yield between the first current collecting disc 2 and the first pole tab 11, and further contributing to further improving the connection strength between the first current collecting disc 2 and the first pole tab 11.

[0103] According to some embodiments of the present application, referring to FIG6 , the minimum distance d3 between the connecting protrusion 21 and the central axis of the pole core 1 is 2 mm ≤ d3 ≤ 8 mm. For example, when the minimum distance d3 between the connecting protrusion 21 and the central axis of the pole core 1 is greater than 8 mm, the overlap area between the first current collecting disc 2 and the first pole tab 11 is reduced, thereby reducing the contact area between the first current collecting disc 2 and the first pole tab 11, thereby improving the structural impedance of the battery cell 100. When the minimum distance d3 between the connecting protrusion 21 and the central axis of the pole core 1 is less than 2 mm, the spacing between the first current collecting disc 2 and the second current collecting disc 3 is small, making it easy for the first current collecting disc 2 to contact the second current collecting disc 3, making it easy for a short circuit to occur between the second current collecting disc 3 and the first current collecting disc 2, thereby affecting the normal use of the battery cell 100. Thus, by ensuring that the minimum distance d3 between the connecting protrusion 21 and the central axis of the electrode core 1 satisfies 2mm≤d3≤8mm, the contact area between the first current collecting disc 2 and the first electrode tab 11 is increased, thereby reducing the structural impedance of the battery cell 100. Furthermore, short circuits between the first current collecting disc 2 and the second current collecting disc 3 are effectively prevented, thereby facilitating the normal operation of the battery cell 100. Furthermore, the weld paths between the first current collecting disc 2 and the first electrode tab 11 are located close to the inner side of the electrode core 1, thereby improving the uniformity of the weld points and further facilitating the connection between the first current collecting disc 2 and the first electrode tab 11.

[0104] According to some embodiments of the present application, referring to Figures 3 and 4, the connection protrusion 21 is formed by a portion of the side surface of the first current collecting disc 2 away from the first pole lug 11 protruding toward the side surface adjacent to the first pole lug 11. For example, in the examples of Figures 3 and 4, the connection protrusion 21 is formed by a portion of the upper surface of the first current collecting disc 2 protruding downward. This arrangement reduces the thickness of the area on the first current collecting disc 2 where the connection protrusion 21 is located, thereby shortening the path for the current to flow through the connection protrusion 21, making it more conducive to the use of the first current collecting disc 2 and further reducing the structural impedance. In addition, the connection protrusion 21 has a simple structure and low processing difficulty, which reduces the production cost of the first current collecting disc 2 and improves the production efficiency of the first current collecting disc 2.

[0105] According to some embodiments of the present application, referring to Figures 3 and 9 , the connecting protrusion 21 forms a groove 23 on the side of the first current collecting tray 2 facing away from the first electrode tab 11, thereby forming the connecting protrusion 21 on the side of the first current collecting tray 2 adjacent to the first electrode tab 11. The depth of the groove 23 is h, where h satisfies the following: 0 mm < h ≤ 2 mm. For example, in the examples shown in Figures 3 and 9 , the connecting protrusion 21 forms a V-shaped groove on the upper surface of the first current collecting tray 2. When the depth h of the groove 23 is greater than 2 mm, the sidewall height of the groove 23 is high, thereby reducing the structural strength of the connecting protrusion 21 and, in turn, the structural strength of the first current collecting tray 2. When the depth of the groove 23 is 0 mm, the lower surface of the first current collecting tray 2 completely contacts and welds to the first electrode tab 11, resulting in a large weld area, high welding costs, and poor connection between the first current collecting tray 2 and other components of the battery cell 100. Therefore, by ensuring that the depth h of the groove 23 satisfies the following: 0 mm < h ≤ 2 mm, the structural strength of the connecting protrusion 21 and, in turn, the structural strength of the first current collecting tray 2 is improved. In addition, the welding cost of the first current collecting plate 2 is reduced, and it is also beneficial to connect the first current collecting plate 2 with other components of the battery cell 100 .

[0106] Optionally, referring to FIG6 , the minimum distance d4 between the side of the first current collecting disc 2 away from the central axis of the pole core 1 and the outer circumference of the pole core 1 satisfies the following conditions: 0.5 mm ≤ d4 ≤ 2 mm. For example, when the minimum distance d4 between the side of the first current collecting disc 2 away from the central axis of the pole core 1 and the outer circumference of the pole core 1 is greater than 2 mm, the connection area between the first current collecting disc 2 and the first pole tab 11 is small, hindering the flow of current between the first pole tab 11 and the first current collecting disc 2, thereby increasing the structural impedance of the battery cell 100. When the minimum distance d4 between the side of the first current collecting disc 2 away from the central axis of the pole core 1 and the outer circumference of the pole core 1 is less than 0.5 mm, the first current collecting disc 2 is likely to contact the outer shell 5 of the outer circumference of the pole core 1, causing the current of the battery cell 100 to pass through the outer shell 5, resulting in a higher structural impedance of the battery cell 100. Thus, by ensuring that the distance d4 between the side of the first current collecting disc 2 away from the central axis of the electrode core 1 and the outer periphery of the electrode core 1 satisfies 0.5 mm ≤ d4 ≤ 2 mm, the connection area between the first current collecting disc 2 and the first electrode tab 11 is large, providing a stable connection and facilitating current flow, thereby reducing the structural impedance of the battery cell 100. Furthermore, this effectively prevents contact between the first current collecting disc 2 and the outer casing 5 of the battery cell 100, thereby preventing the current from flowing through the outer casing 5, further reducing the structural impedance of the battery cell 100. Furthermore, the weld path between the first current collecting disc 2 and the first electrode tab 11 is closer to the inner side of the electrode core 1, thereby improving the uniformity of the distribution of the weld points on the first current collecting disc 2.

[0107] According to some optional embodiments of the present application, the first current collecting disc 2 is a positive electrode current collecting disc and can be configured as a stamped aluminum disc. Aluminum has a certain structural strength. This improves the structural strength of the first current collecting disc 2, facilitating the long-term and stable use of the first current collecting disc 2. Furthermore, the aluminum is conductive, facilitating the flow of current through the first current collecting disc 2. Furthermore, the aluminum stamping improves the flatness of the first current collecting disc 2, thereby enhancing its performance. However, the present application is not limited to this embodiment.

[0108] Further, referring to Figure 4 , the battery cell 100 includes a cover plate assembly 4, which is disposed on a side of the first current collecting tray 2 away from the pole core 1. For example, in the example of Figure 4 , the cover plate assembly 4 is connected to the first current collecting tray 2, which is then connected to the pole core 1 via the first current collecting tray 2. When assembling the battery cell 100, the first current collecting tray 2 is first connected to the first pole lug 11, and then the first current collecting tray 2 is connected to the cover plate assembly 4. This facilitates the current carrying from the first current collecting tray 2 to be drawn out to the exterior of the battery cell 100 through the cover plate assembly 4, thereby facilitating normal use of the battery cell 100. Furthermore, the assembly of the cover plate assembly 4 with the first current collecting tray 2 and the pole core 1 is simple, thereby improving the assembly efficiency of the battery cell 100.

[0109] According to some embodiments of the present application, referring to FIG. 7 and FIG. 8 , the cover plate assembly 4 includes a cover plate body 41 and a positive electrode column 42 .

[0110] Specifically, the second current collecting disc 3 is connected to the cover plate body 41, and the positive electrode post 42 is disposed on the cover plate body 41. The positive electrode post 42 is insulated from the cover plate body 41, and the first current collecting disc 2 is connected to the positive electrode post 42. For example, in the examples of Figures 7 and 8, the upper surface of the third connecting portion 33 of the second current collecting disc 3 is connected (e.g., welded) to the lower surface of the cover plate body 41. The upper surface of the first current collecting disc 2 is connected (e.g., welded) to the lower end surface of the positive electrode post 42. As a result, the current flow path for the positive electrode of the battery cell 100 flows through the first electrode tab 11, the first current collecting disc 2, and the positive electrode post 42 in sequence before being drawn out. The current flow path for the negative electrode of the battery cell 100 flows through the second electrode tab 12 and the cover plate body 41 in sequence before being drawn out. This shortens the current flow paths at both the positive and negative electrodes of the battery cell 100, further reducing the structural impedance of the battery cell 100 and further facilitating its use. In addition, the positive electrode column 42 is insulated from the cover body 41 , thereby preventing a short circuit between the positive electrode column 42 and the cover body 41 , and further preventing a short circuit between the first current collecting disc 2 and the second current collecting disc 3 , which is beneficial for long-term normal use of the battery cell 100 .

[0111] According to some embodiments of the present application, referring to Figures 3 and 8 , the positive electrode post 42 includes a first electrode segment 421 and a second electrode segment 422 connected to each other, with the first electrode segment 421 being disposed on the cover plate body 41. For example, in the examples of Figures 3 and 8 , the lower end of the first electrode segment 421 is connected to the upper surface of the second electrode segment 422, the cross-section of the second electrode segment 422 is larger than the cross-section of the first electrode segment 421, and the lower surface of the second electrode segment 422 is welded to a portion of the upper surface of the first current collecting disc 2. With this arrangement, the first electrode segment 421 facilitates connection of the positive electrode post 42 to the cover plate body 41, and the second electrode segment 422 facilitates connection of the positive electrode post 42 to the first current collecting disc 2, thereby facilitating the connection of the positive electrode post 42 to the cover plate body 41 and the first current collecting disc 2. Furthermore, the connection is stable, facilitating the long-term use of the positive electrode post 42. In addition, the positive electrode column 42 has a simple structure, which is conducive to the use of the positive electrode column 42 and is also conducive to the production and processing of the positive electrode column 42.

[0112] 3 and 8 , the cover plate assembly 4 further includes an insulating separator 43, which is positioned between the cover plate body 41 and the second electrode segment 422. For example, in the examples shown in FIG3 and FIG8 , the first electrode segment 421 is connected to the cover plate body 41 through the insulating separator 43, while the second electrode segment 422 is located below the insulating separator 43 and connected to the first current collecting tray 2. Thus, the provision of the insulating separator 43, on the one hand, insulates the cover plate body 41 from the second electrode segment 422, preventing short circuits between the cover plate body 41 and the positive electrode 42, and thus between the first current collecting tray 2 and the second current collecting tray 3. On the other hand, the insulating connection between the cover plate body 41 and the first current collecting tray 2 ensures that the current in the first current collecting tray 2 flows only through the positive electrode 42 and is discharged, rather than flowing into the cover plate body 41. This prevents short circuits between the first current collecting tray 2 and the cover plate body 41, further facilitating the normal use of the battery cell 100.

[0113] Further, referring to Figures 3 and 10, a stop groove 431 is formed on the insulating separator 43, and the second pole segment 422 fits in the stop groove 431. The first current collecting plate 2 is provided with a mating portion 24 extending toward the stop groove 431, and the mating portion 24 fits in the stop groove 431. The mating portion 24 is located on the side of the second pole segment 422 away from the cover plate body 41. For example, in the examples of Figures 3 and 10, the stop groove 431 is formed on the lower surface of the insulating separator 43, and the outer peripheral surface of the second pole segment 422 is in contact with the side wall of the stop groove 431. The mating portion 24 is located in the stop groove 431, and the outer peripheral surface of the mating portion 24 is in contact with the side wall of the stop groove 431, and the upper surface of the mating portion 24 is in contact with the lower surface of the second pole segment 422. With this arrangement, after the insulating separator 43 is assembled with the positive electrode post 42 and the first current collecting disc 2, the anti-rotation groove 431 has a limiting effect on the second electrode segment 422 and the mating portion 24, effectively preventing the positive electrode post 42 and the first current collecting disc 2 from rotating in a plane perpendicular to the central axis of the electrode core 1. This improves the assembly stability of the cover plate assembly 4 and the first current collecting disc 2, and also avoids contact between the first current collecting disc 2 and the second current collecting disc 3 after rotation, thereby reducing the machining accuracy requirements for the electrode core 1, the first electrode tab 11, and the second electrode tab 12, and improving the production efficiency of the electrode core 1. In addition, when the insulating separator 43 is assembled with the second electrode segment 422 and the mating portion 24, the anti-rotation groove 431 facilitates the positioning of the second electrode segment 422 and the mating portion 24, thereby facilitating the rapid assembly of the insulating separator 43 with the positive electrode post 42 and the first current collecting disc 2, thereby improving the assembly efficiency of the battery cell 100.

[0114] According to some embodiments of the present application, referring to Figures 3 and 10 , a stop protrusion 432 is provided on a side surface of the insulating separator 43 adjacent to the first current collecting disc 2. The stop protrusion 432 and the side surface of the insulating separator 43 adjacent to the first current collecting disc 2 together define a stop groove 431. The side of the stop groove 431 adjacent to the center of the first current collecting disc 2 is open. For example, in the examples of Figures 3 and 10 , the stop protrusion 432 can be C-shaped, corresponding to the end of the second pole segment 422 facing the second current collecting disc 3 and the side of the mating portion 24 facing the second current collecting disc 3. This arrangement facilitates insertion of the mating portion 24 of the first current collecting disc 2 into the stop groove 431 from the open side in a direction perpendicular to the axis of the pole core 1, thereby facilitating assembly of the mating portion 24 and the stop protrusion 432, thereby improving assembly efficiency between the insulating separator 43 and the first current collecting disc 2. Furthermore, the anti-rotation protrusion 432 is also conducive to sufficient contact with the second electrode segment 422 and the mating portion 24, thereby improving the connection stability between the insulating separator 43, the positive electrode 42, and the first current collecting disc 2. In addition, the simple structure of the anti-rotation protrusion 432 simplifies the structure of the insulating separator 43, which is more conducive to the mass production of the insulating separator 43.

[0115] Optionally, the cover plate assembly 4 is connected to the first collecting tray 2 by welding. This provides a more secure connection between the cover plate assembly 4 and the first collecting tray 2, thereby preventing the first collecting tray 2 from falling off the cover plate assembly 4 and ensuring the long-term stability of the cover plate assembly 4 and the first collecting tray 2. However, this is not limited to this embodiment.

[0116] According to some embodiments of the present application, referring to FIG3 , the second current collecting disc 3 is interference-fitted between the second electrode tab 12 and the cover plate body 41. For example, in the example of FIG3 , the upper surface of the second current collecting disc 3 is connected to the lower surface of the cover plate body 41, and the lower surface of the second current collecting disc 3 is connected to the second electrode tab 12. This creates a more compact contact between the second current collecting disc 3, the second electrode tab 12, and the cover plate body 41, thereby improving the sealing performance at the contact point between the second current collecting disc 3 and the cover plate body 41, and further increasing the welding yield of the second current collecting disc 3, the second electrode tab 12, and the cover plate body 41.

[0117] According to some optional embodiments of the present application, referring to Figure 3 , the height of the second current collecting tray 3 is h1, and the distance between the surface of the cover plate body 41 facing the first current collecting tray 2 and the surface of the first current collecting tray 2 facing away from the cover plate body 41 is h2, where h1 and h2 satisfy the following: 0 mm ≤ h1 - h2 ≤ 1 mm. In other words, h2 refers to the vertical distance between the lower surface of the cover plate body 41 and the lower surface of the connecting protrusion 21. During assembly of the battery cell 100, the cover plate assembly 4 is first connected to the first current collecting tray 2 and then to the second current collecting tray 3. For example, when the height h1 of the second current collecting tray 3 and the distance h2 between the side surface of the cover body 41 facing the first current collecting tray 2 and the side surface of the first current collecting tray 2 away from the cover body 41 satisfy h1-h2 greater than 1 mm, the height of the second current collecting tray 3 is relatively large, which is not conducive to the contact between the cover body 41 and the upper surface of the second current collecting tray 3, will reduce the contact area between the cover body 41 and the second current collecting tray 3, reduce the connection stability between the cover body 41 and the second current collecting tray 3, and is not conducive to the normal use of the battery cell 100. Therefore, by setting the height h1 of the second current collecting disc 3 and the distance h2 between the side surface of the cover body 41 facing the first current collecting disc 2 and the side surface of the first current collecting disc 2 away from the cover body 41 to satisfy 0mm≤h1-h2≤1mm, the sealing performance of the contact between the second current collecting disc 3 and the cover body 41 and the second pole lug 12 is improved, and the welding yield and connection stability of the second current collecting disc 3 and the cover body 41 and the second pole lug 12 are improved, which is conducive to the long-term and stable use of the second current collecting disc 3.

[0118] Optionally, the electrode core 1 is formed by winding, and the tabs are either flattened or cut and stacked. The tabs are divided into two sides: one side is a first tab 11, which is connected to the first current collecting disc 2, and the other side is a second tab 12, which is connected to the second current collecting disc 3. The first and second tabs 11, 12 are spaced apart in the radial direction of the electrode core 1. This facilitates the production of the electrode core 1. Furthermore, it prevents short circuits caused by overlapping of the first and second tabs 11, 12, thereby facilitating the normal use of the battery cell 100 and extending its service life.

[0119] Further optionally, referring to FIG2 , a central hole 13 is provided in the central region of the electrode core 1. The central hole 13 is located between the first electrode tab 11 and the second electrode tab 12. The opposing sides of the first electrode tab 11 and the second electrode tab 12 are tangential to the edge of the central hole 13. The diameter of the central hole 13 is d5, where d5 satisfies the following conditions: 2 mm ≤ d5 ≤ 10 mm. When the diameter d5 of the central hole 13 is greater than 10 mm, the area of ​​the first electrode tab 11 and the second electrode tab 12 is small, thereby reducing the contact area between the first electrode tab 11 and the second electrode tab 12 and the corresponding first and second current collecting plates 2 and 3, which is detrimental to the normal operation of the battery cell 100. When the diameter d5 of the central hole 13 is less than 2 mm, the spacing between the first electrode tab 11 and the second electrode tab 12 is small, which can easily cause a short circuit, thus detrimental to the normal operation of the battery cell 100. Therefore, by setting the diameter of the center hole 13 to d5 to satisfy 2mm≤d5≤10mm, the contact area between the first pole tab 11 and the second pole tab 12 and the pole core 1 can be increased, thereby reducing the impedance of the battery cell 100, and preventing the first pole tab 11 and the second pole tab 12 from overlapping and short-circuiting, thereby extending the service life of the battery cell 100.

[0120] Optionally, referring to FIG3 , a first insulating member 6 is disposed between the first electrode tab 11 and the second electrode tab 12. The lower surfaces of the first insulating member 6 on both sides of the width direction are respectively connected to the upper surfaces of the opposite ends of the first electrode tab 11 and the second electrode tab 12. The upper surface of the first insulating member 6 is connected to the lower surface of the mating portion 24 of the first current collecting plate 2. In this configuration, the first insulating member 6 insulates the first electrode tab 11 and the second electrode tab 12, thereby preventing a short circuit between the first electrode tab 11 and the second electrode tab 12. For example, the first insulating member 6 can be configured as an insulating adhesive to provide a bonding effect. Furthermore, the first insulating member 6 is simple to operate and has a low cost.

[0121] According to some optional embodiments of the present application, referring to Figures 2 and 3, a second insulating member 7 is provided on the side of the first current collecting disc 2 away from the first electrode tab 11, a substrate 8 is connected to the side of the cover plate assembly 4 away from the pole core 1, and the outer peripheral edge of the substrate 8 is connected to the outer shell 5. The pole core 1, the second current collecting disc 3, the first current collecting disc 2, and the cover plate assembly 4 are all located within the outer shell 5. Thus, the second insulating member 7 wraps around the upper side and outer peripheral surface of the first current collecting disc 2, the side of the second insulating member 7 is located between the first current collecting disc 2 and the outer shell 5 of the battery cell 100, and the side of the second insulating member 7 away from the first electrode tab 11 is connected to the substrate 8. As a result, the second insulating member 7 insulates the first current collecting disc 2 from the substrate 8 and the outer shell 5, respectively, to prevent a short circuit between the first current collecting disc 2, the substrate 8, and the outer shell 5, and also ensures that the current carrying current of the first current collecting disc 2 flows out after passing through the positive electrode post 42, thereby ensuring a low impedance of the battery cell 100. In addition, the substrate 8 shields the internal components of the housing 5 , which can protect the components inside the housing 5 and prevent them from being damaged, while also preventing the internal structure of the housing 5 from being seen, thereby improving the aesthetics of the battery cell 100 .

[0122] Further, referring to Figures 1 and 2 , the battery cell 100 includes a separator 9 . Both the core 1 and separator 9 are disposed within the outer shell 5 . The separator 9 is positioned between the core 1 and the inner wall of the outer shell 5 , isolating the core 1 from the inner wall of the outer shell 5 by the separator 9 . For example, in the example shown in Figures 1 and 2 , the separator 9 is disposed at one end of the outer shell 5 in the vertical direction, between the lower end of the core 1 and the bottom wall of the outer shell 5 . This arrangement separates the core 1 from the outer shell 5 , preventing the current carrying the core 1 from passing through the outer shell 5 , thereby reducing the structural impedance of the battery cell 100 . Furthermore, the end of the core 1 adjacent to the separator 9 does not contact the bottom wall of the outer shell 5 . The separator 9 protects the core 1 by preventing direct contact between the core 1 and the outer shell 5 and damage to the core 1 , thereby extending the service life of the core 1 and, consequently, the battery cell 100 . In addition, the installation operation of the separator 9 is simple, and the separator 9 only needs to be placed in the housing 5, thereby improving the assembly efficiency of the battery cell 100.

[0123] Optionally, referring to Figures 11-13, the housing 5 includes a body 50 and a bottom cover plate 51. The bottom cover plate 51 is connected to the lower end of the body 50 to define a space for accommodating the pole core 1. The bottom cover plate 51 and the body 50 are welded. A liquid injection hole 511 is provided on the bottom cover plate 51. A sealing structure 512 is provided at the liquid injection hole 511 to cooperate with the liquid injection hole 511. The sealing structure 512 includes an elastic sealing gasket 5121 and a sealing cover 5122. The side of the elastic sealing gasket 5121 facing away from the pole core 1 is connected to the sealing cover 5122. The sealing cover 5122 is welded to the elastic sealing gasket 5121 and the inner wall of the liquid injection hole 511. This strengthens the connection strength between the bottom cover plate 51 and the circumferential sidewalls of the body 50, thereby improving the structural strength of the housing 5 and facilitating the long-term and stable use of the housing 5. Furthermore, the machining accuracy of the body 50 and the bottom cover plate 51 is improved, thereby improving the machining accuracy of the housing 5. Furthermore, after the electrolyte is injected into the battery cell 100 through the injection hole 511, the elastic sealing gasket 5121 is used to seal the injection hole 511, thereby preventing the electrolyte from flowing out and thus preventing damage to the battery cell 100. The sealing cover 5122 further improves the sealing performance between the elastic sealing gasket 5121 and the injection hole 511, thereby further preventing the electrolyte from flowing out and thus further preventing damage to the battery cell 100.

[0124] The battery 1000 according to the second embodiment of the present application includes the battery cell 100 according to the first embodiment of the present application, as shown in FIG14 .

[0125] According to the battery 1000 of the embodiment of the present application, by adopting the above-mentioned battery cell 100 , the service life of the battery 1000 is extended and the performance of the battery 1000 is improved.

[0126] The battery module 2000 according to the third embodiment of the present application includes the battery 1000 according to the above-mentioned second embodiment of the present application, as shown in FIG15 .

[0127] According to the battery module 2000 of the embodiment of the present application, by adopting the above-mentioned battery 1000, the service life of the battery module 2000 is extended and the performance of the battery module 2000 is improved.

[0128] The battery pack 3000 according to the fourth embodiment of the present application includes the battery 1000 according to the second embodiment of the present application or the battery module 2000 according to the third embodiment of the present application, as shown in Figures 16 and 17.

[0129] According to the battery pack 3000 of the embodiment of the present application, by adopting the above-mentioned battery 1000 or the above-mentioned battery module 2000, the service life of the battery pack 3000 is extended, the impedance within the battery 1000 is reduced, and the performance of the battery pack 3000 is improved.

[0130] The power-consuming device 4000 according to the fifth embodiment of the present application includes the battery pack 3000 according to the fourth embodiment of the present application, as shown in FIG18 .

[0131] According to the embodiment of the present application, the power consumption device 4000 improves the performance of the power consumption device 4000 by adopting the above-mentioned battery pack 3000. The power consumption device 4000 can be a vehicle, an electric two-wheeled vehicle, an electric multi-wheeled vehicle, an energy storage cabinet, a drone, a ship, etc.

[0132] Other structures and operations of the battery cell 100 , battery 1000 , battery module 2000 , battery pack 3000 and power-consuming device 4000 according to the embodiments of the present application are well known to those skilled in the art and will not be described in detail here.

[0133] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", "axial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0134] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0135] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell (100), characterized in that, Comprising: A pole core (1), one end of the pole core (1) is provided with a first tab (11) and a second tab (12); A first current collector plate (2), the first current collector plate (2) is arranged at the said one end of the pole core (1), and the first current collector plate (2) is connected to the first tab (11); and A second current collector plate (3), the second current collector plate (3) is arranged at the said one end of the pole core (1), the second current collector plate (3) is connected to the second tab (12), and at least one of the second current collector plate (3) and the first current collector plate (2) is a single-layer structural member.

2. The battery cell (100) according to claim 1, characterized in that, The first current collector plate (2) is located on a side of the first tab (11) away from the pole core (1), and the second current collector plate (3) is located on a side of the second tab (12) away from the pole core (1).

3. The battery cell (100) according to claim 1 or 2, characterized in that, The second current collector plate (3) includes: A first connecting portion (31), the second current collector plate (3) is connected to the second tab (12) through the first connecting portion (31); A second connecting portion (32), the second connecting portion (32) is arranged on a side of the first connecting portion (31) away from the second tab (12); and A third connecting portion (33), the third connecting portion (33) is connected to a side of the second connecting portion (32) away from the first connecting portion (31).

4. The battery cell (100) according to claim 3, wherein, Both the first connecting portion (31) and the third connecting portion (33) extend in a direction perpendicular to the central axis of the pole core (1), and the second connecting portion (32) is vertically connected between the first connecting portion (31) and the third connecting portion (33).

5. The battery cell (100) according to claim 3 or 4, characterized in that, The first connecting portion (31) includes two first sub-connecting portions (311) arranged at intervals, each first sub-connecting portion (311) includes a first side (3111) and a second side (3112), the first side (3111) and the second side (3112) are not on the same straight line, the first sides (3111) of the two first sub-connecting portions (311) are opposite to each other, and the second sides (3112) of the two first sub-connecting portions (311) are on the same straight line; The second connecting portion (32) includes two second sub-connecting portions (321) arranged at intervals, one side of one of the second sub-connecting portions (321) is connected to the first side (3111) and the second side (3112) of one of the first sub-connecting portions (311), and one side of the other second sub-connecting portion (321) is connected to the first side (3111) and the second side (3112) of the other first sub-connecting portion (311); The third connecting portion (33) includes a third sub-connecting portion (331) and a fourth sub-connecting portion (332). The third sub-connecting portion (331) is connected between the other sides of the two second sub-connecting portions (321) that are opposite to the first side edges (3111) of the two first sub-connecting portions (311). One side of the fourth sub-connecting portion (332) is connected to the other sides of the two second sub-connecting portions (321) that are opposite to the second side edges (3112) of the two first sub-connecting portions (311) and the third sub-connecting portion (331). The other side of the fourth sub-connecting portion (332) extends in a direction away from the first connecting portion (31).

6. The battery cell (100) according to claim 5, characterized in that, The first side edge (3111) and the second side edge (3112) are perpendicular to each other.

7. The battery cell (100) according to claim 5 or 6, characterized in that, The second current collector plate (3) is symmetrically arranged with respect to the extending direction of the third sub-connecting portion (331).

8. The battery cell (100) according to any one of claims 3-6, characterized in that, The minimum distance between the first connecting portion (31) and the central axis of the electrode core (1) is d1, where d1 satisfies: 2 mm ≤ d1 ≤ 7.7 mm.

9. The battery cell (100) according to any one of claims 3-7, characterized in that, The first connecting portion (31) is located radially inside the outer periphery of the electrode core (1). The distance between the first connecting portion (31) and the outer periphery of the electrode core (1) is d2, where d2 satisfies: 0.5 mm ≤ d2 ≤ 2 mm.

10. The battery cell (100) according to any one of claims 1-9, characterized in that, The second current collector plate (3) is a negative current collector plate, and the second current collector plate (3) is a stamping formed part of steel or copper.

11. The battery cell (100) according to any one of claims 1-10, characterized in that, A connecting protrusion (21) is provided on one surface of the first current collector plate (2) adjacent to the first tab (11). The first current collector plate (2) is connected to the first tab (11) through the connecting protrusion (21).

12. The battery cell (100) according to claim 11, characterized in that, The connecting protrusion (21) includes a first protrusion portion (211) and a second protrusion portion (212). One end of the first protrusion portion (211) is connected to one end of the second protrusion portion (212). The other end of the first protrusion portion (211) and the other end of the second protrusion portion (212) extend in directions away from each other.

13. The battery cell (100) according to claim 12, characterized in that, The included angle between the first protrusion portion (211) and the second protrusion portion (212) is β, where β satisfies: 20° ≤ β ≤ 80°.

14. The battery cell (100) according to claim 12 or 13, characterized in that, One end of the first protrusion portion (211) and one end of the second protrusion portion (212) are adjacent to the center of one end of the electrode core (1). The other end of the first protrusion portion (211) and the other end of the second protrusion portion (212) extend in directions away from the center of one end of the electrode core (1) and penetrate through the outer periphery of the first current collector plate (2).

15. The cell (100) according to any one of claims 12-14, characterized in that, A notch (22) is formed at the edge of the first current collector plate (2) away from the center of one end of the electrode core (1).

16. The battery cell (100) according to claim 15, characterized in that, The notch (22) is located between the other end of the first protrusion portion (211) and the other end of the second protrusion portion (212).

17. The battery cell (100) according to any one of claims 11-16, characterized in that, The minimum distance between the connecting protrusion (21) and the central axis of the electrode core (1) is d3, where d3 satisfies: 2 mm ≤ d3 ≤ 8 mm.

18. The battery cell (100) according to any one of claims 11-17, characterized in that, The connecting protrusion (21) is formed by a part of the surface of the first current collector plate (2) on the side away from the first tab (11) protruding towards the surface adjacent to the first tab (11).

19. The battery cell (100) according to claim 18, characterized in that, The connecting protrusion (21) forms a groove (23) on the surface of the first current collector plate (2) on the side away from the first tab (11) to form the connecting protrusion (21) on the surface adjacent to the first tab (11). The depth of the groove (23) is h, where h satisfies: 0 mm < h ≤ 2 mm.

20. The battery cell (100) according to any one of claims 1-19, characterized in that, The minimum distance between the side of the first current collector plate (2) away from the central axis of the electrode core (1) and the outer peripheral surface of the electrode core (1) is d4, where d4 satisfies: 0.5 mm ≤ d4 ≤ 2 mm.

21. The battery cell (100) according to any one of claims 1-20, characterized in that, The first current collector plate (2) is a positive current collector plate, and the first current collector plate (2) is a stamping part made of aluminum sheet.

22. The battery cell (100) according to any one of claims 1-21, characterized in that, Further comprising: A cover plate assembly (4), which is arranged on the side of the first current collector plate (2) away from the electrode core (1).

23. The battery cell (100) according to claim 22, characterized in that, The cover plate assembly (4) includes: A cover plate body (41), the second current collector plate (3) is connected to the cover plate body (41); and A positive electrode terminal (42), the positive electrode terminal (42) penetrates through the cover plate body (41), the positive electrode terminal (42) is insulated and connected to the cover plate body (41), and the first current collector plate (2) is connected to the positive electrode terminal (42).

24. The battery cell (100) according to claim 23, characterized in that, The positive electrode terminal (42) includes a first terminal segment (421) and a second terminal segment (422) connected to each other, and the first terminal segment (421) penetrates through the cover plate body (41); The cover plate assembly (4) further includes: An insulating separator (43), which is arranged between the cover plate body (41) and the second terminal segment (422).

25. The battery cell (100) according to claim 24, characterized in that, A rotation prevention groove (431) is formed on the insulating separator (43), and the second terminal segment (422) is fitted in the rotation prevention groove (431); A fitting portion (24) extending towards the rotation prevention groove (431) is provided on the first current collector plate (2), and the fitting portion (24) is fitted in the rotation prevention groove (431). The fitting portion (24) is located on the side of the second terminal segment (422) away from the cover plate body (41).

26. The battery cell (100) according to claim 25, characterized in that, A rotation prevention protrusion (432) is provided on the surface of the insulating separator (43) adjacent to the first current collector plate (2). The rotation prevention protrusion (432) and the surface of the insulating separator (43) adjacent to the first current collector plate (2) jointly define the rotation prevention groove (431), and the side of the rotation prevention groove (431) adjacent to the center of the first current collector plate (2) is open.

27. The battery cell (100) according to any one of claims 23-26, characterized in that, The second current collector plate (3) is in interference fit between the second tab (12) and the cover plate body (41).

28. The battery cell (100) according to any one of claims 23-27, characterized in that, The height of the second current collector plate (3) is h1, and the distance between the surface of the cover plate body (41) facing the first current collector plate (2) and the surface of the first current collector plate (2) away from the cover plate body (41) is h2, where h1 and h2 satisfy: 0 mm ≤ h1 - h2 ≤ 1 mm.

29. A battery (1000), characterized in that, Comprising the battery cell (100) according to any one of claims 1-28.

30. A battery module (2000), characterized in that, Comprising the battery (1000) according to claim 29.

31. A battery pack (3000), characterized in that, Comprising the battery (1000) according to claim 29 or the battery module (2000) according to claim 30.

32. An electrical device (4000), characterized in that, Comprising the battery pack (3000) according to claim 31.

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