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

Abstract

A battery cell (100), a battery (1000), a battery module (2000), a battery pack (3000), and an electrical device (4000). The battery cell (100) comprises a housing (1); the housing (1) comprises a cover plate assembly (12) and a housing body (11) that together define an accommodating cavity (13); the cover plate assembly (12) comprises a cover plate (121) and an electrode post (122) connected in an insulated fashion on the cover plate (121); an electrode core (20) is arranged within the accommodating cavity (13); and a first electrode tab (201) and a second electrode tab (202) of opposite polarities are arranged at a same end of the electrode core (20); A first current collecting plate (3) is arranged within the accommodating cavity (13) and is located between the first electrode tab (201) and the cover plate assembly (12), and the electrode post (122) is electrically connected to the first electrode tab (201) by means of the first current collecting plate (3); a second current collecting plate (4) is arranged within the accommodating cavity (13) and is located between the second electrode tab (202) and the cover plate assembly (12), the cover plate (121) is electrically connected to the second electrode tab (202) by means of the second current collecting plate (4), and the second current collecting plate (4) is insulated from both the electrode post (122) and the first current collecting plate (3).

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 202311863240.X and entitled “Battery Cell, Battery, Battery Module, Battery Pack and Electrical Device,” 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 are also related to the battery life and capacity of vehicles.

[0005] In the prior art, battery cells consist of tabs and current collector plates, which are connected to facilitate the smooth flow of current from the tabs. However, this results in a long current flow path, resulting in a high structural impedance and inconvenience for normal use of the battery cell.

[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 with reasonable electrical connection design of various components of the battery cell, shortening the current flow path and reducing the structural impedance of the battery cell.

[0008] The second objective of the present application is to provide a battery comprising 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 a battery pack using the above-mentioned 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 shell, the shell includes a shell and a cover plate assembly, the cover plate assembly is arranged on the shell, and the cover plate assembly and the shell jointly define a accommodating cavity, the cover plate assembly includes a cover plate and a pole, and the pole is insulated and connected to the cover plate; a pole core, the pole core is arranged in the accommodating cavity, and a first pole lug and a second pole lug are provided on the pole core, the first pole lug and the second pole lug have opposite polarities, and the first pole lug and the second pole lug are located at the same end of the pole core; a first current collecting disk, the first current collecting disk is arranged in the accommodating cavity, the first current collecting disk is located between the first pole lug and the cover plate assembly, and the pole is electrically connected to the first pole lug through the first current collecting disk; and a second current collecting disk, the second current collecting disk is arranged in the accommodating cavity, the second current collecting disk is located between the second pole lug and the cover plate assembly, the cover plate is electrically connected to the second pole lug through the second current collecting disk, and the second current collecting disk is insulated from both the pole and the first current collecting disk.

[0013] According to the battery cell of the embodiment of the first aspect of the present application, the assembly of the battery cell is simple and the assembly efficiency is high. By setting the pole to be electrically connected to the first pole lug through the first current collecting disk, and the cover plate to be electrically connected to the second pole lug through the second current collecting disk, the layout of the battery cell, the first current collecting disk, the second current collecting disk and the cover plate assembly are reasonable, and the electrical connection design is reasonable, so that the current of the battery cell can flow in the up and down directions, greatly shortening the current flow path, effectively reducing the structural impedance of the battery cell, and thus improving the performance of the battery cell. In addition, by setting the cover plate to be insulated from the pole, it is possible to effectively prevent the current on the pole from flowing to the cover plate, thereby avoiding a short circuit between the first pole lug and the second pole lug of the battery cell, which is beneficial to the normal use of the battery cell.

[0014] According to some embodiments of the present application, the second current collecting disc is spaced apart from the pole and the first current collecting disc.

[0015] According to some embodiments of the present application, the battery cell further includes: a first insulating member, the first insulating member is arranged between the first pole tab and the second pole tab, and the first pole tab and the second pole tab are insulated by the first insulating member.

[0016] According to some embodiments of the present application, the first pole tab and the second pole tab are opposite to each other along the radial direction of the pole core.

[0017] According to some embodiments of the present application, the cover plate assembly further includes: a substrate, the substrate is connected to the shell, an opening is formed on the substrate, the cover plate is arranged at the opening, and the pole is passed through the cover plate.

[0018] According to some embodiments of the present application, the outer periphery of the cover plate has a step portion, and the edge of the opening has a matching portion extending toward the center of the opening, and the matching portion is matched on the step portion.

[0019] According to some embodiments of the present application, on the side where the second current collecting plate is located, the minimum distance between the edge of the opening and the outer periphery of the substrate is d1, wherein d1 satisfies: 1.5 mm ≤ d1 ≤ 4 mm.

[0020] According to some embodiments of the present application, the battery cell further includes: a second insulating member, which is provided between the substrate and the first current collecting disk, and the substrate and the first current collecting disk are insulated by the second insulating member.

[0021] According to some embodiments of the present application, at least one of the second current collecting plate and the first current collecting plate is a single-layer structure.

[0022] 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 lug, and the first connecting portion extends in a direction perpendicular to the central axis of the pole core; a second connecting portion, which is arranged on a side of the first connecting portion away from the second pole lug; and a third connecting portion, which is connected to a side of the second connecting portion away from the first connecting portion, and the third connecting portion extends in a direction perpendicular to the central axis of the pole core, and the second connecting portion is vertically connected between the third connecting portion and the first connecting portion.

[0023] According to some embodiments of the present application, the first connection part includes two first sub-connection parts arranged at intervals, each of the first sub-connection parts 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 parts are opposite to each other, and the second sides of the two first sub-connection parts are located on the same straight line; the second connection part includes two second sub-connection parts arranged at intervals, one side of one of the second sub-connection parts is connected to the first side and the second side of one of the first sub-connection parts, and one side of the other second sub-connection part is connected to the first side and the second side of the other first sub-connection part; the third connection part includes a third sub-connection part, and the third sub-connection part is connected to the other side of the two second sub-connections that is opposite to the first sides of the two first sub-connections.

[0024] According to some embodiments of the present application, the third sub-connection portion is connected between the other side of the two second sub-connection portions that is opposite to the first side edges of the two first sub-connection portions.

[0025] According to some embodiments of the present application, the third connecting portion includes a fourth sub-connecting portion, one side of the fourth sub-connecting portion is connected to the other side of the two second sub-connecting portions opposite to the second side edges of the two first sub-connecting portions and the third sub-connecting portion, and the other side of the fourth sub-connecting portion extends horizontally in a direction away from the first connecting portion.

[0026] According to some embodiments of the present application, the first side and the second side are perpendicular to each other.

[0027] 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.

[0028] According to some embodiments of the present application, the height of the second current collecting plate is h3, and the distance between the side surface of the cover plate facing the first current collecting plate and the side surface of the first current collecting plate away from the cover plate is h4, wherein h3 and h4 satisfy: 0mm≤h3-h4≤1mm.

[0029] 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.

[0030] 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, 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, and the angle between the first protrusion portion and the second protrusion portion is β, wherein β satisfies: 20°≤β≤80°.

[0031] According to some embodiments of the present application, a notch is formed on a central edge of the first current collecting plate away from the pole core.

[0032] 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.

[0033] According to some embodiments of the present application, the connecting protrusion is formed by a portion of the side surface of the first current collecting disk away from the first pole ear protruding toward the side surface adjacent to the first pole ear, and the connecting protrusion forms a groove on the side surface of the first current collecting disk away from the first pole ear to form the connecting protrusion on the side surface adjacent to the first pole ear, and the depth of the groove is h5, wherein h5 satisfies: 0mm<h5≤2mm.

[0034] According to some embodiments of the present application, the first collecting plate and the cover plate assembly are integrated into one body.

[0035] According to some embodiments of the present application, the first current collecting disk includes a main body portion, which is used to be connected to the first pole lug. Along the thickness direction of the first current collecting disk, the main body portion is exposed from the cover plate, and the shortest distance between the main body portion and the center of the pole is d0, wherein d0 satisfies: 2mm≤d0≤8mm.

[0036] According to some embodiments of the present application, the pole is passed through the cover plate, and a first insulating separator and a seal are provided between the outer peripheral surface of the pole and the cover plate. The seal is sleeved on the pole, and the first insulating separator is provided on the seal and the outer peripheral side of the pole.

[0037] According to some embodiments of the present application, the battery cell further includes: a connector connected to an end of the pole away from the first current collecting disk along the thickness direction of the first current collecting disk; and a second insulating separator, which is arranged between the connector and the cover plate.

[0038] According to some embodiments of the present application, a second insulating spacer groove is formed on the second insulating spacer, the connecting member is fitted into the second insulating spacer groove, and the connecting member is insulated from the cover plate by the second insulating spacer.

[0039] According to some embodiments of the present application, the pole includes a first pole segment and a second pole segment connected to each other, the first pole segment is connected to the connecting member after passing through the cover plate and the second insulating separator, and the second pole segment is located on the side of the cover plate facing the first current collecting disk, and the second pole segment is connected to the first current collecting disk.

[0040] According to some embodiments of the present application, a stop protrusion is provided on a side surface of the first insulating separator adjacent to the first current collecting disk, and the stop protrusion and the side surface of the first insulating separator adjacent to the first current collecting disk jointly define a stop groove, and the side of the stop groove adjacent to the center of the first current collecting disk is open, and the second pole segment fits in the stop groove; an extension portion is provided on the first current collecting disk, and at least a portion of the outer periphery of the extension portion fits in the stop groove, and the extension portion is located on the side of the second pole segment away from the cover plate.

[0041] According to some embodiments of the present application, at least a portion of the outer periphery of the extension portion is adapted to the shape of the inner peripheral wall of the anti-rotation groove.

[0042] According to some embodiments of the present application, a cover plate protrusion is provided on the side surface of the cover plate adjacent to the first insulating separator; a first insulating separator groove is formed on the side surface of the first insulating separator adjacent to the cover plate, and the cover plate protrusion fits in the first insulating separator groove.

[0043] According to some embodiments of the present application, a first insulating spacer through-hole is formed on the bottom wall of the first insulating spacer groove, and the first pole segment passes through the first insulating spacer through-hole.

[0044] According to some embodiments of the present application, the width of the connector is w, and the diameter of the pole is d7, wherein w and d7 satisfy: 3.5 mm ≤ w - d7 ≤ 6 mm.

[0045] According to some embodiments of the present application, the battery cell further includes: a separator, which is arranged in the shell, and the separator is located between the end of the pole core away from the first pole ear and the inner wall of the shell, and the pole core is separated from the inner wall of the shell by the separator.

[0046] According to some embodiments of the present application, at least one through hole is formed on the separator, and a pressure relief device is provided on the outer shell, and the pressure relief device is configured to release the internal pressure of the battery cell. The pressure relief device is located on a side of the outer shell away from the separator, and at least a portion of the pressure relief device is opposite to the through hole along the thickness direction of the separator.

[0047] According to some embodiments of the present application, at least a portion of the pressure relief device is configured to release the internal pressure of the battery cell, and the area overlapping with the through hole along the separator is S1, and the cross-sectional area of ​​the pressure relief device along a plane perpendicular to the thickness direction of the separator is S2, wherein S1 and S2 satisfy: 50%≤S1 / S2≤100%.

[0048] According to some embodiments of the present application, the cross-sectional area of ​​the through hole along a plane perpendicular to the thickness direction of the separator is S3, and the cross-sectional area of ​​the separator along a plane perpendicular to the thickness direction of the separator is S4, wherein S3 and S4 satisfy: 30%≤S3 / S4≤80%.

[0049] A battery according to an embodiment of the second aspect of the present application includes the battery cell according to the embodiment of the first aspect.

[0050] The battery module according to the third embodiment of the present application includes the battery according to the above-mentioned second embodiment.

[0051] The battery pack according to the fourth embodiment of the present application includes the battery according to the above-mentioned second embodiment or the battery module according to the above-mentioned third embodiment.

[0052] An electrical device according to an embodiment of the fifth aspect of the present application includes a battery pack according to the embodiment of the fourth aspect.

[0053] 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

[0054] 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:

[0055] FIG1 is a schematic diagram of a battery cell according to an embodiment of the present application;

[0056] FIG2 is an exploded view of a battery cell according to an embodiment of the present application;

[0057] FIG3 is a partial exploded view of a battery cell according to an embodiment of the present application, wherein the housing is not shown;

[0058] FIG4 is a cross-sectional view of an end portion of a battery cell according to an embodiment of the present application;

[0059] FIG5 is an enlarged view of the circled portion A in FIG3 ;

[0060] FIG6 is a partial schematic diagram of a battery cell according to an embodiment of the present application, wherein the substrate is not shown;

[0061] FIG7 is a schematic diagram of a second current collecting disk of a battery cell according to an embodiment of the present application;

[0062] 8 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;

[0063] 9 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;

[0064] FIG10 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;

[0065] FIG11 is a schematic diagram of a first current collecting disk of a battery cell according to an embodiment of the present application;

[0066] FIG12 is a schematic diagram of a cover plate assembly of a battery cell according to an embodiment of the present application;

[0067] FIG13 is a schematic diagram of a first insulating separator of a battery cell according to an embodiment of the present application;

[0068] FIG14 is a schematic diagram of the first current collecting plate of the battery cell according to an embodiment of the present application from another angle;

[0069] FIG15 is a top view of a battery cell according to an embodiment of the present application, wherein the substrate is not shown;

[0070] FIG16 is a top view of a battery cell according to an embodiment of the present application;

[0071] FIG17 is a schematic diagram of a pole core of a battery cell according to an embodiment of the present application;

[0072] FIG18 is a schematic diagram of a battery cell according to an embodiment of the present application from another angle;

[0073] FIG19 is an exploded view of a battery cell according to an embodiment of the present application from another angle;

[0074] FIG20 is a schematic diagram of a sealing structure of a battery cell according to an embodiment of the present application;

[0075] FIG21 is a schematic diagram of a separator of a battery cell according to an embodiment of the present application;

[0076] FIG22 is a schematic diagram of the assembly of a separator and a pressure relief device of a battery cell according to an embodiment of the present application;

[0077] FIG23 is a schematic diagram of the assembly of a separator and a pressure relief device of a battery cell according to another embodiment of the present application;

[0078] FIG24 is a schematic diagram of the assembly of a separator and a pressure relief device of a battery cell according to yet another embodiment of the present application;

[0079] FIG25 is a schematic block diagram of a battery according to an embodiment of the present application;

[0080] FIG26 is a schematic block diagram of a battery module according to an embodiment of the present application;

[0081] FIG27 is a schematic block diagram of a battery pack according to an embodiment of the present application;

[0082] FIG28 is another schematic block diagram of a battery pack according to an embodiment of the present application;

[0083] FIG29 is a schematic block diagram of an electric device according to an embodiment of the present application.

[0084] Reference numerals:

[0085] Power device 4000, battery pack 3000, battery module 2000, battery 1000,

[0086] Battery Cell 100,

[0087] Shell 1, shell body 11, shell body 111, bottom cover plate 112, reinforcing rib 1121, liquid injection hole 1122, sealing structure 1123, elastic sealing gasket 1124, sealing cover 1125, cover plate assembly 12, cover plate 121, step portion 1211, cover plate through hole 1212, cover plate protrusion 1213, cover plate groove 1214, pole 122, first pole segment 1221, second pole segment 1222, base plate 123, opening 1231, matching portion 1232, first insulating separator 124, anti-rotation protrusion 1241, anti-rotation groove 1242, first insulating separator groove 1243, first insulating separator through-hole 1244, second insulating separator 125, second insulating separator groove 1251, connecting member 126, sealing member 127, first sealing segment 1271, second sealing segment 1272, accommodating chamber 13, pressure relief device 14, protective member 141,

[0088] Pole core assembly 2, pole core 20, first pole ear 201, second pole ear 202, center hole 203,

[0089] The first collecting plate 3, the connecting protrusion 31, the first protrusion 311, the second protrusion 312, the notch 32, the groove 33, the extension part 34, the main body 35,

[0090] The second current collecting plate 4, the first connecting portion 41, the first sub-connecting portion 411, the first side 4111, the second side 4112, the second connecting portion 42, the second sub-connecting portion 421, the third connecting portion 43, the third sub-connecting portion 431, the fourth sub-connecting portion 432,

[0091] First insulating member 5, second insulating member 6,

[0092] Separator 7 , through hole 71 , first through hole group 72 , first through hole 721 , second through hole group 73 , second through hole 731 . DETAILED DESCRIPTION

[0093] The following describes embodiments of the present application in detail. The embodiments described with reference to the accompanying drawings are exemplary. Referring to Figures 1-24 , a battery cell 100 according to an embodiment of the first aspect of the present application is described below. The battery cell 100 may be a cylindrical battery cell, but is not limited thereto. In the following description of the present application, the battery cell 100 is described using a cylindrical battery cell as an example.

[0094] As shown in FIG1 , FIG2 and FIG3 , the battery cell 100 according to the embodiment of the first aspect of the present application includes a housing 1 , a pole core 20 , a first current collecting disc 3 and a second current collecting disc 4 .

[0095] Specifically, the housing 1 includes a shell 11 and a cover assembly 12. The cover assembly 12 is provided on the shell 11, and the cover assembly 12 and the shell 11 jointly define a receiving cavity 13. For example, in the examples of Figures 1 and 2, the shell 11 is provided in a cylindrical shape, and the cover assembly 12 is connected to the upper end of the shell 11 to jointly define the receiving cavity 13. As a result, the processing accuracy of the shell 11 and the cover assembly 12 is improved, thereby improving the processing accuracy of the shell 1. Moreover, it is convenient to assemble the components in the receiving cavity 13 with the shell 1, thereby reducing the difficulty of assembling the battery cell 100 and increasing the assembly speed of the battery cell 100.

[0096] 2-4 , the cover plate assembly 12 includes a cover plate 121 and a pole 122 , the pole 122 is insulated and connected to the cover plate 121 , the pole core 20 , the first current collecting disc 3 and the second current collecting disc 4 are all arranged in the accommodating cavity 13 , the pole core 20 is provided with a first pole ear 201 and a second pole ear 202 , the polarities of the first pole ear 201 and the second pole ear 202 are opposite, the pole 122 is electrically connected to the first pole ear 201 through the first current collecting disc 3 , and the cover plate 121 is electrically connected to the second pole ear 202 through the second current collecting disc 4 .

[0097] For example, in the following description of this application, the first electrode tab 201 is used as a positive electrode tab, the second electrode tab 202 is used as a negative electrode tab, the first current collecting plate 3 is used as a positive electrode current collecting plate, the second current collecting plate 4 is used as a negative electrode current collecting plate, and the electrode post 122 is used as a positive electrode post. For example, in the examples of Figures 2-5, the electrode core 20 extends in the vertical direction, and the first electrode tab 201 is electrically connected to the electrode post 122 through the first current collecting plate 3. This allows the current of the first electrode tab 201 to flow out in the vertical direction through the first current collecting plate 3 and the electrode post 122 in sequence. This shortens the flow path of the current, reduces the structural impedance of the battery cell 100, and facilitates the normal use of the battery cell 100. The second electrode tab 202 is electrically connected to the cover plate 121 via the second current collecting disc 4, allowing the current from the second electrode tab 202 to flow out in the vertical direction sequentially through the second current collecting disc 4 and the cover plate 121. This shortens the current flow path, and the currents from the positive and negative electrodes of the battery cell 100 do not interfere with each other, thereby reducing the structural impedance of the battery cell 100 and further facilitating the normal use of the battery cell 100. Furthermore, by providing an insulated connection between the cover plate 121 and the electrode 122, the current from the electrode 122 can be effectively prevented from flowing to the cover plate 121, thereby preventing a short circuit between the first electrode tab 201 and the second electrode tab 202 of the battery cell 100, thereby facilitating the normal use of the battery cell 100. In addition, the layout of the battery cell 100, the first current collecting plate 3, the second current collecting plate 4 and the cover plate assembly 12 are reasonable, and the electrical connection design is reasonable, so that the current carrying the battery cell 100 can flow in the up and down directions, greatly shortening the current flow path, effectively reducing the structural impedance of the battery cell 100, and thus improving the performance of the battery cell 100.

[0098] In conjunction with Figures 2 and 4 , the first and second electrode tabs 201 and 202 are located at the same end of the electrode core 20. The first current collecting disc 3 is located between the first electrode tab 201 and the cover plate assembly 12, and the second current collecting disc 4 is located between the second electrode tab 202 and the cover plate assembly 12. The second current collecting disc 4 is insulated from both the electrode post 122 and the first current collecting disc 3. For example, in the examples of Figures 2 and 4 , the first and second electrode tabs 201 and 202 are both located at the upper end of the electrode core 20. The first electrode tab 201 and the first current collecting disc 3 are vertically opposed, while the second electrode tab 202 and the second current collecting disc 4 are vertically opposed. The cover plate assembly 12 is located above the first and second current collecting discs 3 and 4. The electrode post 122 and the first current collecting disc 3 are located on the same side of the second current collecting disc 4, and the first and second current collecting discs 3 and 4 are radially opposed to each other in the electrode core 20.

[0099] Thus, by locating the first and second tabs 201 and 202 at the same end of the core 20, the exhaust channel can be provided on only one side of the battery cell 100, thereby improving the space utilization of the battery cell 100. Furthermore, the core 20, first current collecting tray 3, second current collecting tray 4, and cover plate assembly 12 are rationally arranged and compactly structured, thereby facilitating the smooth flow of current carried by the first and second tabs 201 and 202 while also improving the integration of the battery cell 100 and further facilitating its transportation and use. After the battery cell 100 is installed, the second current collecting tray 4 and the first current collecting tray 3 are located at the ends of the core 20, facilitating their inspection and improving their detectability. In addition, by insulating the second collecting disc 4 from the pole 122 and the first collecting disc 3 , a short circuit between the second collecting disc 4 , the pole 122 and the first collecting disc 3 is avoided, so that the second collecting disc 4 and the cover plate assembly 12 can be used normally.

[0100] According to the battery cell 100 of the embodiment of the first aspect of the present application, the assembly of the battery cell 100 is simple and the assembly efficiency is high. By setting the pole 122 to be electrically connected to the first pole lug 201 through the first current collecting disc 3, and the cover plate 121 to be electrically connected to the second pole lug 202 through the second current collecting disc 4, the layout of the battery cell 100, the first current collecting disc 3, the second current collecting disc 4 and the cover plate assembly 12 are reasonable, and the electrical connection design is reasonable, so that the current of the battery cell 100 can flow in the up and down directions, greatly shortening the current flow path, effectively reducing the structural impedance of the battery cell 100, and thus improving the performance of the battery cell 100. In addition, by setting the cover plate 121 to be insulated from the pole 122, it is possible to effectively prevent the current on the pole 122 from flowing to the cover plate 121, thereby preventing a short circuit between the first pole lug 201 and the second pole lug 202 of the battery cell 100, which is beneficial to the normal use of the battery cell 100.

[0101] According to some embodiments of the present application, in conjunction with Figures 2 and 4, the second current collecting disc 4 is spaced apart from the pole 122 and the first current collecting disc 3. For example, in the examples of Figures 2 and 4, the lower end of the pole 122 is connected to the first current collecting disc 3, and the connected first current collecting disc 3 and the second current collecting disc 4 are arranged opposite each other along the radial direction of the battery cell 100. In this way, physical isolation of the first current collecting disc 3 and the second current collecting disc 4 can be achieved, that is, the first current collecting disc 3 and the second current collecting disc 4 are not in direct contact, so as to avoid a short circuit between the first current collecting disc 3 and the second current collecting disc 4, thereby facilitating the normal use of the battery cell 100. In addition, the method of achieving the purpose of insulating connection by spacing is relatively simple and highly operable.

[0102] According to some embodiments of the present application, referring to FIG2 , the battery cell 100 further includes a first insulating member 5 , which is disposed between the first electrode tab 201 and the second electrode tab 202 . The first electrode tab 201 and the second electrode tab 201 are insulated from each other by the first insulating member 5 . For example, in the example of FIG2 , both sides of the lower side surface of the first insulating member 5 in the width direction (e.g., the direction indicated by arrow B in FIG2 ) are connected to the first electrode tab 201 and the second electrode tab 202 , respectively, and the upper side surface of the first insulating member 5 is connected to a portion of the lower side surface of the first current collecting plate 3 . Thus, by providing the first insulating member 5 , the first electrode tab 201 and the second electrode tab 202 can be insulated, thereby preventing a short circuit between the second electrode tab 202 and the first electrode tab 201 , thereby facilitating the normal use of the battery cell 100 . For example, the first insulating member 5 can be configured as an insulating adhesive so that the first insulating member 5 has a bonding effect, thereby making the use of the first insulating member 5 simple and cost-effective.

[0103] According to some embodiments of the present application, referring to Figures 4 and 5, the thickness of the first insulating member 5 is h1, where h1 satisfies the following: 20 μm ≤ h1 ≤ 200 μm. For example, when the thickness h1 of the first insulating member 5 is greater than 200 μm, the first insulating member 5 uses more material, resulting in a higher cost for the first insulating member 5 and, consequently, a higher production cost for the battery cell 100. When the thickness h1 of the first insulating member 5 is less than 20 μm, the connection between the first insulating member 5 and the first and second tabs 201 and 202 is weak, thereby reducing the operational stability of the first insulating member 5. Therefore, by ensuring that the thickness h1 of the first insulating member 5 satisfies the following: 20 μm ≤ h1 ≤ 200 μm, the material used for the first insulating member 5 is reduced, thereby reducing the production cost of the first insulating member 5 and, in turn, the production cost of the battery cell 100. Furthermore, the connection stability between the first insulating member 5 and the first and second tabs 201 and 202 is improved, thereby facilitating the long-term and stable operation of the first insulating member 5.

[0104] According to some embodiments of the present application, in conjunction with Figures 2 and 3 , the first and second tabs 201, 202 are radially opposed to each other along the electrode core 20. For example, in the examples of Figures 2 and 3 , the first and second tabs 201, 202 are each semicircular, and the electrode core 20 can be cylindrical. The first and second tabs 201, 202 are spaced apart along the width direction of the first insulating member 5. As a result, the first and second tabs 201, 202 are less likely to contact each other, thereby preventing a short circuit between the first and second tabs 201, 202. This facilitates circuit connection and normal operation of the battery cell 100. Furthermore, the large areas of the first and second tabs 201, 202 facilitate connection between the first and second current collecting trays 3, current flow between the first and second tabs 201, and connection between the second and second current collecting trays 4, as well as current flow between the second and second tabs 202. It should be noted that the distance between the first electrode tab 201 and the second electrode tab 202 on the sides close to each other can be set according to specific usage to better meet actual applications.

[0105] Further, referring to Figures 2 and 3, the cover plate assembly 12 includes a substrate 123, which is connected to the housing 11. An opening 1231 is formed on the substrate 123. The cover plate 121 is located at the opening 1231, and the pole 122 is passed through the cover plate 121. For example, in the examples of Figures 2 and 3, the substrate 123 is located above the cover plate 121, the outer peripheral surface of the substrate 123 is connected to the upper end of the housing 11, the edge of the opening 1231 is matched with the outer peripheral edge of the cover plate 121, and the pole 122 is exposed from the opening 1231. With this arrangement, the substrate 123 can cover a portion of the cover plate 121, thereby improving the protective effect of the substrate 123 on the cover plate 121, and thereby extending the service life of the cover plate 121. In addition, the overall appearance of the battery cell 100 is relatively simple, which improves the aesthetics of the battery cell 100. In addition, the upper end of the pole 122 is exposed from the opening 1231, which facilitates the current of the first pole tab 201 to flow out through the pole 122. For example, the first pole tab 201 is the positive pole tab, and the second pole tab 202 is the negative pole tab. The current flow path of the positive electrode of the battery cell 100 flows through the first pole tab 201, the first current collecting plate 3, and the pole 122 in sequence before being drawn out. The current flow path of the negative electrode of the battery cell 100 flows through the second pole tab 202, the cover plate 121, and the base plate 123 in sequence before being drawn out. This shortens the current flow paths at both the positive and negative poles of the battery cell 100, further reducing the structural impedance of the battery cell 100 and further facilitating the use of the battery cell 100.

[0106] Optionally, referring to Figures 2 and 3, the opening 1231 is roughly semicircular, the shape of the cover 121 is adapted to the shape of the opening 1231, and the annular connection between the substrate 123 and the cover 121, as well as the annular connection between the substrate 123 and the shell 11 are roughly similar to a "U"-shaped design as a whole, that is, the connection between the substrate 123 and the cover 121 is annular, and the connection between the substrate 123 and the shell 11 is located at the periphery of the connection between the above-mentioned substrate 123 and the cover 121 and is annular, thereby avoiding the overlap of welds at the welding points of the substrate 123, the cover 121 and the shell 11, resulting in poor welding, and avoiding the inflection point design, resulting in poor inflection point welding.

[0107] According to some embodiments of the present application, with reference to Figures 4 and 5, the outer periphery of the cover plate 121 has a step portion 1211, and the edge of the opening 1231 has a mating portion 1232 extending toward the center of the opening 1231, and the mating portion 1232 is mated to the step portion 1211. For example, in the examples of Figures 4 and 5, the edge of the cover plate 121 is formed as a step portion 1211, and the connection between the mating portion 1232 and the substrate 123 is also stepped. Such a configuration facilitates the assembly and pressing of the cover plate 121 and the substrate 123, improves the connection stability of the cover plate 121 and the substrate 123, thereby improving the feasibility of the process, and further improving the assembly efficiency and assembly stability of the cover plate 121 and the substrate 123. In addition, the cover plate 121 and the substrate 123 are not prone to relative movement, thereby improving the stability of the substrate 123 during long-term use.

[0108] According to some embodiments of the present application, in conjunction with FIG. 16 , on the side where the second collecting plate 4 is located, the minimum distance between the edge of the opening 1231 and the outer periphery of the substrate 123 is d1 , where d1 satisfies: 1.5 mm ≤ d1 ≤ 4 mm.

[0109] For example, when the minimum distance d1 between the edge of opening 1231 and the outer periphery of substrate 123 is greater than 4 mm, the cross-sectional area of ​​cover plate 121 is reduced due to the fit between the edge of opening 1231 and the edge of cover plate 121. This reduces the contact area between cover plate 121 and second current collecting tray 4, thereby reducing the welding area between cover plate 121 and second current collecting tray 4 and improving the structural impedance of battery cell 100. When the minimum distance d1 between the edge of opening 1231 and the outer periphery of substrate 123 is less than 1.5 mm, the spacing between the edge of opening 1231 and the outer periphery of substrate 123 on the side where second current collecting tray 4 is located is small, resulting in a mutual impact between the welding of substrate 123 to cover plate 121 and the welding of substrate 123 to housing 11, thereby reducing the welding yield of cover plate assembly 12. Furthermore, this reduces the structural strength of substrate 123 and shortens its service life. Thus, by ensuring that the minimum distance d1 between the edge of opening 1231 and the outer periphery of substrate 123 satisfies 1.5 mm ≤ d1 ≤ 4 mm, the cross-sectional area of ​​cover plate 121 is increased, thereby increasing the contact area between cover plate 121 and second current collecting tray 4 and reducing the structural impedance of battery cell 100. Furthermore, this prevents interference between the welding of substrate 123 to cover plate 121 and the welding of substrate 123 to housing 11, thereby improving the welding yield of cover plate assembly 12.

[0110] According to some embodiments of the present application, in conjunction with FIG2 , the battery cell 100 further includes a second insulating member 6, which is disposed between the substrate 123 and the first current collecting disc 3, and the substrate 123 and the first current collecting disc 3 are insulated by the second insulating member 6. For example, in the example of FIG2 , the second insulating member 6 wraps the upper side and outer peripheral surface of the first current collecting disc 3. Thus, the second insulating member 6 insulates the substrate 123 and the first current collecting disc 3, thereby preventing a short circuit between the substrate 123 and the first current collecting disc 3, and also ensures that the current carrying current of the first current collecting disc 3 flows out after passing through the pole 122, thereby enabling the cover plate assembly 12 to be used normally for a long time and reducing the structural impedance. For example, the second insulating member 6 can be set as an insulating glue so that the second insulating member 6 has a bonding effect, so that the second insulating member 6 is easy to use and has a low cost.

[0111] According to some embodiments of the present application, referring to Figures 2 and 5 , the thickness of the second insulating member 6 is h2, where h2 satisfies the following: 20 μm ≤ h2 ≤ 200 μm. For example, when the thickness h2 of the second insulating member 6 is greater than 200 μm, the second insulating member 6 uses more material, resulting in a higher cost, which in turn increases the production cost of the battery cell 100. When the thickness h2 of the second insulating member 6 is less than 20 μm, the connection between the second insulating member 6 and the first current collecting plate 3 is weakened, thereby reducing the insulating effect of the second insulating member 6. Therefore, by ensuring that the thickness h2 of the second insulating member 6 satisfies the following: 20 μm ≤ h2 ≤ 200 μm, the material used in the second insulating member 6 is reduced, thereby reducing the production cost of the second insulating member 6 and, in turn, the production cost of the battery cell 100. Furthermore, the connection between the second insulating member 6 and the substrate 123 and the first current collecting plate 3 is strengthened, thereby facilitating the long-term use of the second insulating member 6 and the proper operation of the battery cell 100.

[0112] According to some embodiments of the present application, in conjunction with Figures 7-11 , at least one of the second current collecting tray 4 and the first current collecting tray 3 is a single-layer structure. For example, in the example of Figure 2 , both the first current collecting tray 3 and the second current collecting tray 4 are located at the upper end of the electrode core 20 . The aforementioned configurations of the first current collecting tray 3 and the second current collecting tray 4 include the following: first, only the first current collecting tray 3 is a single-layer structure; second, only the second current collecting tray 4 is a single-layer structure; and third, both the first current collecting tray 3 and the second current collecting tray 4 are single-layer structures. As a result, current on the first electrode tab 201 can flow through the first current collecting tray 3 and out, and current on the second electrode tab 202 can flow through the second current collecting tray 4. Furthermore, the current can flow directly through the second current collecting tray 4 or the first current collecting tray 3 along the thickness direction of the first or second current collecting tray 3, thereby shortening the current flow path and effectively reducing the structural impedance of the battery cell 100, facilitating the normal operation of the battery cell 100 and improving its performance. Furthermore, the single-layer structure is simple and uses less material, thereby reducing the production cost of the second current collecting tray 4 and the first current collecting tray 3, and thus reducing the production cost of the battery cell 100. It should be noted that a "single-layer structural member" refers to a portion of the structural member that has no bends or overlaps along its thickness. In other words, the first current collecting tray 3 is a single-layer structure with no bends or overlaps, and the second current collecting tray 4 is a single-layer structure with no bends or overlaps.

[0113] Optionally, the second current collecting disc 4 is connected to the second pole tab 202 by welding, and the first current collecting disc 3 is connected to the first pole tab 201 by welding. For example, the second current collecting disc 4 is laser welded to the second pole tab 202, and the first current collecting disc 3 is laser welded to the first pole tab 201. This ensures a more secure connection between the second current collecting disc 4 and the second pole tab 202, and a more secure connection between the first current collecting disc 3 and the first pole tab 201, thereby preventing the second current collecting disc 4 from falling off the second pole tab 202 and the first current collecting disc 3 from falling off the first pole tab 201. This improves the connection stability between the first and second current collecting discs 3 and 4. Furthermore, compared to traditional torque welding, laser welding unrestricts the current flowing through the first and second current collecting discs 3 and 4, and reduces welding costs, 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.

[0114] According to some embodiments of the present application, referring to FIG7 , the second current collecting plate 4 includes a first connecting portion 41, a second connecting portion 42, and a third connecting portion 43. Specifically, the second current collecting plate 4 is connected to the second pole tab 202 via the first connecting portion 41. The first connecting portion 41 extends in a direction perpendicular to the central axis of the pole core 20. The second connecting portion 42 is provided on a side of the first connecting portion 41 away from the second pole tab 202. The third connecting portion 43 is connected to a side of the second connecting portion 42 away from the first connecting portion 41. The third connecting portion 43 extends in a direction perpendicular to the central axis of the pole core 20. The second connecting portion 42 is vertically connected between the third connecting portion 43 and the first connecting portion 41.

[0115] For example, in the example of FIG7 , the lower surface of the first connecting portion 41 is connected to the upper surface of the second electrode tab 202, the lower end of the second connecting portion 42 is connected to the side edge of the upper surface of the first connecting portion 41, and the side edge of the lower surface of the third connecting portion 43 is connected to the upper end of the second connecting portion 42. Thus, the first connecting portion 41 is connected to the second electrode tab 202, and the contact area between the first connecting portion 41 and the second electrode tab 202 is large, thereby facilitating a convenient and secure connection between the first connecting portion 41 and the second electrode tab 202. Furthermore, the second connecting portion 42 supports the first connecting portion 41 and the third connecting portion 43, thereby improving the structural strength of the second current collecting disc 4 and facilitating long-term and stable use of the second current collecting disc 4. The first connecting portion 41 and the third connecting portion 43 are parallel to the upper surface of the second electrode tab 202, while the second connecting portion 42 is perpendicular to the upper surface of the second electrode tab 202. This arrangement improves the flatness of the second current collecting tray 4, thereby facilitating connection of the second current collecting tray 4 to other components of the battery cell 100 (e.g., the cover plate 121) via the third connecting portion 43. This improves the welding yield between the second current collecting tray 4 and other components of the battery cell 100, effectively preventing the second current collecting tray 4 from falling off the battery cell 100, and thereby improving the operational stability of the second current collecting tray 4. Furthermore, the second current collecting tray 4 has a simple structure and is easily manufactured and processed, thereby improving the production efficiency of the second current collecting tray 4 and reducing the production cost of the second current collecting tray 4.

[0116] Optionally, referring to Figure 7 , the second current collecting disc 4 is an integrally formed part, comprising a first connecting portion 41 protruding toward the second pole tab 202, a third connecting portion 43 protruding toward the cover plate 121, and a second connecting portion 42 connected between the first connecting portion 41 and the third connecting portion 43. A height difference exists between the first connecting portion 41 and the third connecting portion 43. With this arrangement, the second current collecting disc 4 has a simple structure and is easy to manufacture and process. Furthermore, the second connecting portion 42 serves as a reinforcing rib to strengthen the connection between the first connecting portion 41 and the third connecting portion 43, and provides support for the first connecting portion 41 and the third connecting portion 43, thereby facilitating the long-term use of the second current collecting disc 4.

[0117] Single-layer current collectors used in conventional technology are typically flat sheet-shaped, without reinforcing ribs. The contact surface between the current collector and the tab is poorly flat, resulting in poor welding yield. In the solution of the present application, the first connection portion 41 of the second current collector 4 protrudes toward the second tab 202, while the third connection portion 43 protrudes away from the second tab 202. The first connection portion 41 is used to connect to the second tab 202, and the third connection portion 43 is used to connect to electrical lead-out components such as the cover plate 121 to draw current from the second tab 202. The second connection portion 42 strengthens the structural strength of the second current collector 4, while also supporting and strengthening the connection between the first connection portion 41 and the second tab 202, as well as the connection to other electrical connectors. This improves the flatness of the connection between the second current collector 4 and the second tab 202, making it less likely to collapse when subjected to force.

[0118] According to some embodiments of the present application, in conjunction with FIG7 , the first connection portion 41 includes two first sub-connection portions 411 spaced apart from each other, each first sub-connection portion 411 including a first side 4111 and a second side 4112. The first side 4111 and the second side 4112 are not on the same straight line (i.e., the first side 4111 and the second side 4112 are arranged at an angle thereto). The first side 4111 of the two first sub-connection portions 411 are opposite each other, and the second side 4112 of the two first sub-connection portions 411 are on the same straight line. For example, in the example of FIG7 , the two first sub-connection portions 411 are located on either side of the second connection portion 42, and the first sub-connection portion 411 can be arranged in a fan shape, with the first side 4111 and the second side 4112 being two edges of the fan shape. As a result, both first sub-connecting portions 411 can be connected to the second electrode tab 202, thereby improving the overall stability of the connection between the second current collecting disc 4 and the second electrode tab 202 and providing a secure connection, thereby preventing the second current collecting disc 4 from falling off the second electrode tab 202 and improving the performance of the battery cell 100. Furthermore, the two first sub-connecting portions 411 increase the contact area between the second current collecting disc 4 and the second electrode tab 202, thereby improving the connection strength between the second current collecting disc 4 and the second electrode tab 202 and further reducing the structural impedance of the battery cell 100.

[0119] 7 , the second connection portion 42 includes two spaced-apart second sub-connection portions 421. One side of one of the second sub-connection portions 421 is connected to the first side 4111 and the second side 4112 of one of the first sub-connection portions 411, and one side of the other second sub-connection portion 421 is connected to the first side 4111 and the second side 4112 of the other first sub-connection portion 411. For example, in the example of FIG. 7 , the two second sub-connection portions 421 correspond one-to-one with the two first sub-connection portions 411. The two second sub-connection portions 421 are spaced apart along the arrangement direction of the two first sub-connection portions 411. The second sub-connection portions 421 can be arranged vertically and bend and extend along the first side 4111 and the second side 4112, with the bend forming an arc-shaped transition. This arrangement simplifies the structure of the second sub-connection portions 421, thereby simplifying the structure of the second current collecting tray 4, reducing the difficulty of manufacturing the second current collecting tray 4, and improving the production efficiency of the second current collecting tray 4. In addition, the structural strength of the second sub-connection portion 421 is enhanced, thereby further improving the supporting effect of the second connection portion 42 on the first connection portion 41 and the third connection portion 43 , thereby improving the structural strength of the second collecting plate 4 .

[0120] 7 , the third connection portion 43 includes a third sub-connection portion 431, which is connected to the other side of the two second sub-connection portions 421, opposite the first side edges 4111 of the two first sub-connection portions 411. For example, the lower surface of the third sub-connection portion 431 is connected to the upper side of the second sub-connection portion 421, opposite the first side edges 4111. The third sub-connection portion 431 can be connected between the two second sub-connection portions 421, with both sides of the third sub-connection portion 431 extending beyond the second sub-connection portions 421 along the width direction of the third sub-connection portion 431. Thus, the second current collecting tray 4 can be connected to the cover plate 121 via the third sub-connection portion 431.

[0121] Furthermore, the third connection portion 43 includes a fourth sub-connection portion 432, one side of the fourth sub-connection portion 432 is connected to the other side of the two second sub-connection portions 421 opposite to the second side edges 4112 of the two first sub-connection portions 411 and the third sub-connection portion 431, and the other side of the fourth sub-connection portion 432 extends in a direction away from the first connection portion 41.

[0122] For example, in the example of FIG7 , the third connection portion 43 is generally T-shaped, with the third sub-connection portion 431 being the vertical segment of the T and the fourth sub-connection portion 432 being the horizontal segment of the T. Both sides of the third sub-connection portion 431 in the width direction are respectively connected to the sides of the two second sub-connection portions 421 that are away from the two first side edges 4111 (i.e., the upper sides of the second sub-connection portions 421 that are opposite the first side edges 4111). The plane in which the fourth sub-connection portion 432 lies is parallel to the plane in which the first sub-connection portion 411 lies. The side of the fourth sub-connection portion 432 that faces the first connection portion 41 is connected to the sides of the two second sub-connection portions 421 that are away from the two second side edges 4112. Furthermore, the side of the fourth sub-connection portion 432 that faces the first connection portion 41 is connected to the side of the third sub-connection portion 431 that faces the fourth sub-connection portion 432. With this arrangement, the two second sub-connecting portions 421 are connected together via the third sub-connecting portion 431, thereby connecting the second current collecting tray 4 into a single unit and improving the structural strength of the second current collecting tray 4. Furthermore, the provision of the fourth sub-connecting portion 432 increases the area of ​​the third connecting portion 43, thereby improving the connection stability between the upper surface of the second current collecting tray 4 and other components of the battery cell 100 when the second current collecting tray 4 is connected to them. Furthermore, the structure of the second current collecting tray 4 is simple, making it easier to produce, thereby improving the production efficiency of the second current collecting tray 4. Furthermore, the fourth sub-connecting portion 432 acts as a reinforcing rib, enhancing the strength and flatness of the second current collecting tray 4 and improving the welding yield.

[0123] According to some embodiments of the present application, as shown in FIG7 , the first side 4111 and the second side 4112 are perpendicular to each other. This arrangement results in a substantially semicircular cross-section of the second current collecting tray 4. This increases the contact area between the second current collecting tray 4 and the second electrode tab 202 via the first sub-connecting portion 411, facilitating connection between the second current collecting tray 4 and the second electrode tab 202. Furthermore, the second current collecting tray 4 has a stable structure, facilitating long-term use.

[0124] According to some embodiments of the present application, with reference to FIG7 , the second current collecting disc 4 is symmetrically arranged about the extension direction of the third sub-connecting portion 431 (i.e., the extension direction of the first side 4111). This arrangement allows the third sub-connecting portion 431 and the corresponding second sub-connecting portion 421 below to be located in the middle of the second current collecting disc 4, thereby providing better support for the first connecting portion 41 and the third connecting portion 43. When under pressure, the force applied to the second current collecting disc 4 is more evenly distributed, preventing the disc 4 from tipping over and tearing the connection between the disc 4 and the second tab 202.

[0125] According to some embodiments of the present application, referring to FIG8 , the minimum distance between the first connection portion 41 and the central axis of the electrode core 20 is d2, where d2 satisfies the following: 2 mm ≤ d2 ≤ 7.7 mm. For example, in the example of FIG8 , the minimum distance between the second side 4112 and the central axis of the electrode core 20 is d2. For example, when the minimum distance between the first connection portion 41 and the central axis of the electrode core 20 is greater than 7.7 mm, the contact area between the first connection portion 41 and the second electrode tab 202 is small, thereby reducing the uniformity of the weld distribution and improving the structural impedance of the electrode core 20. When the minimum distance between the first connection portion 41 and the central axis of the electrode core 20 is less than 2 mm, the spacing between the first connection portion 41 and the first current collecting plate 3 is small, making it easier for the second current collecting plate 4 to contact the first current collecting plate 3, which can easily cause a short circuit between the second current collecting plate 4 and the first current collecting plate 3, thereby affecting the normal operation of the battery cell 100. Thus, by ensuring that the minimum distance d2 between the first connecting portion 41 and the central axis of the pole core 20 satisfies the condition of 2 mm ≤ d2 ≤ 7.7 mm, the uniformity of the weld distribution at the connection between the first connecting portion 41 and the second current collecting disc 4 is improved, thereby reducing the structural impedance of the pole core 20. Furthermore, this prevents short circuits caused by contact between the second current collecting disc 4 and the first current collecting disc 3, thereby facilitating the long-term normal use of the battery cell 100.

[0126] According to some embodiments of the present application, referring to FIG8 , the first connection portion 41 is located radially inward of the outer periphery of the pole core 20 , and the distance between the first connection portion 41 and the outer periphery of the pole core 20 is d3 , where d3 satisfies the following: 0.5 mm ≤ d3 ≤ 2 mm. For example, when the distance d3 between the first connection portion 41 and the outer periphery of the pole core 20 is greater than 2 mm, the connection area between the first connection portion 41 and the second pole tab 202 is small, the connection stability between the second current collecting plate 4 and the second pole tab 202 is reduced, and the flow of current is not conducive, thereby increasing the structural impedance of the battery cell 100 . When the distance d3 between the first connection portion 41 and the outer periphery of the pole core 20 is less than 0.5 mm, the first connection portion 41 is likely to contact the housing 11 provided on the outer periphery of the pole core 20 , causing the current of the battery cell 100 to pass through the housing 11, resulting in a higher structural impedance of the battery cell 100 . Thus, by ensuring that the distance d3 between the first connecting portion 41 and the outer periphery of the electrode core 20 satisfies 0.5 mm ≤ d3 ≤ 2 mm, the connection area between the first connecting portion 41 and the second electrode tab 202 is large, the connection between the second current collecting plate 4 and the second electrode tab 202 is secure, and the structural impedance of the battery cell 100 is reduced. Furthermore, the first connecting portion 41 can be effectively prevented from contacting the housing 11 of the battery cell 100, thereby preventing the current carried by the battery cell 100 from passing through the housing 11, further reducing the structural impedance of the battery cell 100.

[0127] According to some embodiments of the present application, the second collecting tray 4 is a stamped part made of steel or copper. Copper is corrosion-resistant and conductive. This facilitates the normal use of the second collecting tray 4 and improves its structural strength, facilitating its long-term and stable use. Furthermore, the copper stamping improves the flatness of the second collecting tray 4, thereby enhancing its performance. Furthermore, the hardness of steel contributes to the structural strength of the second collecting tray 4.

[0128] According to some embodiments of the present application, as shown in Figures 4 and 5, the height of the second current collecting tray 4 (i.e., the distance between the upper surface of the third connecting portion 43 and the lower surface of the first connecting portion 41) is h3, and the distance between the side surface of the cover plate 121 facing the first current collecting tray 3 and the side surface of the first current collecting tray 3 away from the cover plate 121 is h4, where h3 and h4 satisfy: 0mm≤h3-h4≤1mm. In other words, h4 refers to the vertical distance between the lower surface of the cover plate 121 and the lower surface of the first current collecting tray 3. During the assembly process of the battery cell 100, the cover plate assembly 12 is first connected to the first current collecting tray 3 and then to the second current collecting tray 4. For example, when the height h3 of the second current collecting tray 4 and the distance h4 between the side of the cover plate 121 facing the first current collecting tray 3 and the side of the first current collecting tray 3 facing away from the cover plate 121 satisfy h3-h4 greater than 1 mm, the thickness of the second current collecting tray 4 is relatively large, which is not conducive to contact between the cover plate 121 and the upper surface of the second current collecting tray 4. This reduces the contact area between the cover plate 121 and the second current collecting tray 4, reduces the connection stability between the cover plate 121 and the second current collecting tray 4, and is not conducive to normal use of the battery cell 100. When the height h3 of the second current collecting tray 4 and the distance h4 between the side of the cover plate 121 facing the first current collecting tray 3 and the side of the first current collecting tray 3 facing away from the cover plate 121 satisfy h3-h4 is 0, the height of the second current collecting tray 4 is equal to the vertical distance between the lower surface of the cover plate 121 and the lower surface of the first current collecting tray 3, and the second current collecting tray 4 fits precisely between the cover plate 121 and the second electrode tab 202. Therefore, by setting the height h3 of the second current collecting disk 4 and the distance h4 between the side surface of the cover plate 121 facing the first current collecting disk 3 and the side surface of the first current collecting disk 3 away from the cover plate 121 to satisfy 0mm≤h3-h4≤1mm, the sealing of the contact between the second current collecting disk 4 and the cover plate 121 and the second pole tab 202 is improved, and the welding yield and connection stability of the second current collecting disk 4 and the cover plate 121 and the second pole tab 202 are improved, which is conducive to the long-term and stable use of the second current collecting disk 4.

[0129] According to other embodiments of the present application, referring to FIG. 4 , the second current collecting disc 4 is interference-fitted between the second pole tab 202 and the cover plate 121. For example, in the example of FIG. 4 , the upper surface of the second current collecting disc 4 is connected to the lower surface of the cover plate 121, and the lower surface of the second current collecting disc 4 is connected to the second pole tab 202. The height of the second current collecting disc 4 can be greater than the vertical height between the second pole tab 202 and the cover plate 121. For example, the interference fit can be set to 0 mm to 1 mm (excluding 0 mm and including 1 mm). Thus, the second current collecting disc 4 can be interference-fitted between the second pole tab 202 and the cover plate 121. A reasonable interference fit allows for a tighter contact between the second current collecting disc 4, the second pole tab 202, and the cover plate 121, thereby improving the sealing performance at the contact point between the second current collecting disc 4 and the cover plate 121 and, in turn, improving the welding yield of the second current collecting disc 4, the second pole tab 202, and the cover plate 121.

[0130] According to some embodiments of the present application, in conjunction with Figures 11 and 14 , a connecting protrusion 31 is provided on a surface of the first current collecting disc 3 adjacent to the first electrode tab 201. The first current collecting disc 3 is connected to the first electrode tab 201 via the connecting protrusion 31. For example, in the examples of Figures 11 and 14 , the connecting protrusion 31 is formed by a portion of the first current collecting disc 3 protruding toward the first electrode tab 201. This arrangement allows the first current collecting disc 3 to contact and connect with the first electrode tab 201 via the connecting protrusion 31, facilitating an interference fit between the first current collecting disc 3 and the first electrode tab 201. This improves the welding yield when the first current collecting disc 3 is welded to the first electrode tab 201, thereby enhancing the connection strength between the first current collecting disc 3 and the first electrode tab 201. Furthermore, the simple structure of the connecting protrusion 31 simplifies the structure of the first current collecting disc 3 and facilitates mass production of the first current collecting disc 3.

[0131] 11 and 14 , the connecting protrusion 31 includes a first protrusion 311 and a second protrusion 312. One end of the first protrusion 311 is connected to one end of the second protrusion 312, and the other end of the first protrusion 311 and the other end of the second protrusion 312 extend away from each other. For example, in the examples of FIG11 and FIG14 , the connecting protrusion 31 can be configured in a "V" shape, with one end of the first protrusion 311 near the center of the first collecting tray 3 connected to one end of the second protrusion 312 near the center of the first collecting tray 3, the other end of the first protrusion 311 and the other end of the second protrusion 312 both extending away from the center of the first collecting tray 3, and the first protrusion 311 and the second protrusion 312 being symmetrical about the centerline of the first collecting tray 3. This arrangement provides a simple and rationally designed connection protrusion 31. This improves the overall stability of the connection between the first current collecting tray 3 and the first electrode tab 201 after the first current collecting tray 3 is connected to the first electrode tab 201, preventing the first current collecting tray 3 from shaking or rotating, thereby improving the operational stability of the battery cell 100. Furthermore, the connection protrusion 31 is easy to manufacture, thereby reducing the difficulty in manufacturing the first current collecting tray 3 and improving the production efficiency of the first current collecting tray 3.

[0132] With reference to Figure 15 , the angle β between the first protrusion 311 and the second protrusion 312 is defined as β, where β satisfies the following: 20° ≤ β ≤ 80°. For example, when the angle β between the first protrusion 311 and the second protrusion 312 is greater than 80°, the distance between the other end of the first protrusion 311 and the other end of the second protrusion 312 is greater, resulting in a larger spacing between the weld points at the edge of the first current collecting tray 3, reducing the connection stability between the first current collecting tray 3 and the first tab 201 of the battery cell 100. When the angle β between the first protrusion 311 and the second protrusion 312 is less than 20°, the distance between the other end of the first protrusion 311 and the other end of the second protrusion 312 is smaller, and the distance between the opposing sides of the first protrusion 311 and the second protrusion 312 is smaller, reducing the uniformity of the distribution of the weld points on the first current collecting tray 3 and thus the connection stability of the first current collecting tray 3. Therefore, by setting the angle β between the first protrusion 311 and the second protrusion 312 to satisfy 20°≤β≤80°, the position distribution of the first protrusion 311 and the second protrusion 312 is moderate, thereby improving the uniformity of the distribution of the welding points of the first collecting disc 3, and further improving the connection stability of the first collecting disc 3, which is beneficial to the long-term use of the first collecting disc 3.

[0133] According to some embodiments of the present application, referring to Figures 11 and 14 , one end of the first protrusion 311 and one end of the second protrusion 312 are adjacent to the second current collecting disc 4 (i.e., adjacent to the center of the electrode core 20), while the other ends of the first protrusion 311 and the other ends of the second protrusion 312 extend away from the second current collecting disc 4 (i.e., away from the center or central axis of the electrode core 20) and extend through the outer periphery of the first current collecting disc 3. For example, in the examples of Figures 11 and 14 , the one end of the first protrusion 311 and the one end of the second protrusion 312 are connected. This arrangement increases the overlap area between the first protrusion 311 and the second protrusion 312 and the first electrode tab 201, thereby increasing the contact area and reducing the structural impedance of the battery cell 100. Furthermore, the simple structure of the first protrusion 311 and the second protrusion 312 facilitates the production of the connecting protrusion 31, thereby improving the production efficiency of the first current collecting disc 3. Furthermore, by arranging the ends of the first protrusion 311 and the second protrusion 312, which are spaced apart from each other, to penetrate the outer periphery of the first current collecting disc 3, the thickness of the edge of the first current collecting disc 3 is reduced, thereby further facilitating the passage of current and reducing the structural impedance.

[0134] According to some embodiments of the present application, in conjunction with Figures 8-11 , a notch 32 is formed on the edge of the first current collecting disc 3. For example, in the examples of Figures 8-11 , the notch 32 is recessed toward the center of the first current collecting disc 3 and can be configured in a semicircular shape. Consequently, when the first current collecting disc 3 is connected to the first electrode tab 201 via laser welding, during the cooling process after welding, some areas of the first current collecting disc 3 may shrink more than others due to different thermal expansion coefficients, resulting in residual stress within the weld area. The notch 32 can alleviate this residual stress, thereby preventing thermal deformation and weld defects caused by welding the first current collecting disc 3 to the first electrode tab 201, further improving the connection strength between the first current collecting disc 3 and the first electrode tab 201. For example, the notch 32 is located between the other end of the first protrusion 311 and the other end of the second protrusion 312. Thus, the notch 32 is formed near the middle of the edge of the first current collecting disc 3 to better alleviate this residual stress. However, this is not limited to this embodiment.

[0135] According to some embodiments of the present application, referring to FIG8 , the minimum distance d4 between the connecting protrusion 31 and the central axis of the electrode core 20 is 2 mm ≤ d4 ≤ 8 mm. For example, when the minimum distance d4 between the connecting protrusion 31 and the central axis of the electrode core 20 is greater than 8 mm, the overlap area between the first current collecting disc 3 and the first electrode tab 201 is reduced, thereby reducing the contact area between the first current collecting disc 3 and the first electrode tab 201, thereby improving the structural impedance of the battery cell 100. When the minimum distance d4 between the connecting protrusion 31 and the central axis of the electrode core 20 is less than 2 mm, the spacing between the first current collecting disc 3 and the second current collecting disc 4 is small, making it easy for the first current collecting disc 3 to contact the second current collecting disc 4, making it easy for a short circuit to occur between the second current collecting disc 4 and the first current collecting disc 3, thereby affecting the normal use of the battery cell 100. Thus, by ensuring that the minimum distance d4 between the connecting protrusion 31 and the central axis of the electrode core 20 satisfies 2mm≤d4≤8mm, the contact area between the first current collecting disc 3 and the first electrode tab 201 is increased, thereby reducing the structural impedance of the battery cell 100. Furthermore, short circuits between the first current collecting disc 3 and the second current collecting disc 4 are effectively prevented, thereby facilitating the normal operation of the battery cell 100. Furthermore, the weld paths between the first current collecting disc 3 and the first electrode tab 201 are located close to the inner side of the electrode core 20, thereby improving the uniformity of the weld points and further facilitating the connection between the first current collecting disc 3 and the first electrode tab 201.

[0136] According to some embodiments of the present application, in conjunction with Figures 11 and 14, the connection protrusion 31 is formed by a portion of the side surface of the first current collecting disc 3 away from the first pole lug 201 protruding toward the side surface adjacent to the first pole lug 201. For example, in the examples of Figures 11 and 14, the connection protrusion 31 is formed by a portion of the upper surface of the first current collecting disc 3 protruding downward. This configuration reduces the thickness of the area on the first current collecting disc 3 where the connection protrusion 31 is located, thereby shortening the path for the current to flow through the connection protrusion 31, making it more convenient for the use of the first current collecting disc 3 and further reducing the structural impedance. In addition, the connection protrusion 31 has a simple structure and is relatively easy to process, which reduces the production cost of the first current collecting disc 3 and improves the production efficiency of the first current collecting disc 3.

[0137] Referring to Figures 11 and 14 , the connecting protrusion 31 forms a groove 33 on the side of the first current collecting tray 3 facing away from the first electrode tab 201, thereby forming the connecting protrusion 31 on the side of the first current collecting tray 3 adjacent to the first electrode tab 201. The depth of the groove 33 is h5, where h5 satisfies the following: 0 mm < h5 ≤ 2 mm. For example, in the examples shown in Figures 11 and 14 , the connecting protrusion 31 forms a V-shaped groove 33 on the upper surface of the first current collecting tray 3. When the depth h5 of the groove 33 is greater than 2 mm, the sidewall height of the groove 33 is increased, thereby reducing the structural strength of the connecting protrusion 31 and, in turn, the first current collecting tray 3. When the depth h5 of the groove 33 is 0 mm, the lower surface of the first current collecting tray 3 completely contacts and welds to the first electrode tab 201, resulting in a larger weld area, higher welding costs, and poor connection between the first current collecting tray 3 and other components of the battery cell 100. Thus, by setting the depth h5 of the groove 33 to satisfy 0 mm < h5 ≤ 2 mm, the structural strength of the connecting protrusion 31 is improved, thereby improving the structural strength of the first current collecting tray 3. In addition, the welding cost of the first current collecting tray 3 is reduced, and the connection between the first current collecting tray 3 and other components of the battery cell 100 is also facilitated.

[0138] Optionally, referring to Figure 8 , the minimum distance d5 between the side of the first current collecting disc 3 away from the central axis of the pole core 20 and the outer circumference of the pole core 20 is defined as d5, where d5 satisfies the following conditions: 0.5 mm ≤ d5 ≤ 2 mm. For example, when the minimum distance d5 between the side of the first current collecting disc 3 away from the central axis of the pole core 20 and the outer circumference of the pole core 20 is greater than 2 mm, the connection area between the first current collecting disc 3 and the first pole tab 201 is small, hindering the flow of current between the first pole tab 201 and the first current collecting disc 3, thereby increasing the structural impedance of the battery cell 100. When the minimum distance d5 between the first current collecting disc 3 and the outer circumference of the pole core 20 is less than 0.5 mm, the first current collecting disc 3 is likely to contact the outer shell 11 of the pole core 20, causing the current of the battery cell 100 to pass through the shell 11, resulting in a higher structural impedance of the battery cell 100. Therefore, by ensuring that the distance d5 between the first current collecting disc 3 and the outer periphery of the electrode core 20 satisfies the condition 0.5 mm ≤ d5 ≤ 2 mm, the connection area between the first current collecting disc 3 and the first electrode tab 201 is large, ensuring 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 3 and the battery cell 100 casing 11, thereby preventing the current from flowing through the casing 11 and further reducing the structural impedance of the battery cell 100. Furthermore, the weld path between the first current collecting disc 3 and the first electrode tab 201 is closer to the inner side of the electrode core 20, thereby improving the uniformity of the distribution of the weld points on the first current collecting disc 3.

[0139] In some optional embodiments of the present application, the first current collecting tray 3 can be configured as a stamped aluminum sheet. Aluminum has a certain structural strength. This improves the structural strength of the first current collecting tray 3, facilitating its long-term and stable use. Furthermore, the aluminum sheet is conductive, facilitating the flow of current through the first current collecting tray 3. Furthermore, the stamped aluminum sheet improves the flatness of the first current collecting tray 3, thereby enhancing its performance. However, this is not intended to be limiting.

[0140] According to some embodiments of the present application, the first current collecting disc 3 and the cover plate assembly 12 are integrated into one. For example, in the examples of Figures 2 and 3, after the pole 122 is connected to the cover plate 121, the lower end face of the pole 122 is connected to the upper side face of the first current collecting disc 3. With such a configuration, the integration can allow the pole 122 and the first current collecting disc 3 to be pre-connected, such as by welding, and then the integrated first current collecting disc 3 is connected to the first pole lug 201, thereby improving the integration of the cover plate assembly 12, facilitating the use of the cover plate assembly 12, and thus improving the performance of the cover plate assembly 12. When the cover plate assembly 12 is used for the battery cell 100, it is beneficial to the assembly of the cover plate assembly 12 with other components of the battery cell 100, simplifying the assembly operation steps of the battery cell 100, reducing the difficulty of assembly, and improving the efficiency of assembly. In the split structure of the related art, to ensure that the welding point between the collector plate and the tab is as close as possible to the center of the pole core, the pole post and the collector plate can only be welded in the middle of the pole core. However, when welding from top to bottom, due to the insulating member in the middle, the insulation will fail during welding, causing a battery short circuit. Usually, the only option is to weld from bottom to top. However, due to the high heat of laser welding, torque welding can only be used. However, torque welding is not conducive to improving the current carrying capacity of the battery cell and is relatively expensive. Therefore, the solution of the present application can avoid the use of torque welding between the pole post 122 and the first collector plate 3, thereby improving the current carrying capacity of the battery cell 100 and facilitating the use of the battery cell 100.

[0141] According to some embodiments of the present application, in combination with Figure 15, the first current collecting disc 3 includes a main body 35, which is used to connect with the first pole lug 201. Along the thickness direction of the first current collecting disc 3 (for example, the up and down direction), the main body 35 is exposed on the cover plate 121, and the shortest distance between the main body 35 and the center of the pole 122 is d0, where d0 satisfies: 2mm≤d0≤8mm.

[0142] For example, in the example of Figure 15 , a portion of the first current collecting disc 3 is located below the cover plate 121 and connected to the pole 122, while the other portion of the first current collecting disc 3 (i.e., the main body 35) is exposed outside the cover plate 121. After the first current collecting disc 3 and the pole 122 are welded together, the first current collecting disc 3 is then welded to the first terminal tab 201. To reduce impedance and ensure current carrying capacity, welding is required to weld as many turns of the terminal tab as possible. In other words, the closer the welding trajectory of the first current collecting disc 3 is to the center of the pole core 20, the better. Therefore, when the shortest distance d0 between the edge of the main body 35 of the first current collecting disc 3 near the pole 122 and the center of the pole 122 is less than 2 mm, that is, the distance between the edge of the cover plate 121 facing the first current collecting disc 3 and the central axis of the pole 122 is small, the vertical overlap area between the first current collecting disc 3 and the cover plate 121 is small, which is not conducive to the connection between the first current collecting disc 3 and the pole 122. When the shortest distance d0 between the edge of the main body 35 of the first current collecting disc 3 near the pole 122 and the center of the pole 122 is greater than 8 mm, the welding path between the first current collecting disc 3 and the first tab 201 is farther from the center of the pole 122, increasing impedance and reducing current carrying capacity. Therefore, by ensuring that the shortest distance d0 between the main body 35 of the first current collecting disc 3 and the center of the pole 122 satisfies the following conditions: 2 mm ≤ d0 ≤ 8 mm, the distance between the main body 35 of the first current collecting disc 3 exposed from the cover plate 121 and the center of the pole 122 is appropriately set, facilitating the connection between the first current collecting disc 3, the first tab 201, and the pole 122, while also reducing impedance and improving current carrying capacity.

[0143] Optionally, d0 further satisfies the following: 4mm≤d0≤8mm. For example, when the shortest distance d0 between the main body 35 and the center of the pole 122 is less than 4mm, i.e., the distance between the edge of the cover plate 121 facing the first current collecting disc 3 and the central axis of the pole 122 is small, the vertical overlap area between the first current collecting disc 3 and the cover plate 121 is small, which hinders the connection between the first current collecting disc 3 and the pole 122. Therefore, by ensuring that the shortest distance d0 between the main body 35 and the center of the pole 122 satisfies 2mm≤d0≤8mm, the distance between the main body 35 of the first current collecting disc 3 exposed outside the cover plate 121 and the center of the pole 122 is more optimal, facilitating the connection between the first current collecting disc 3, the first tab 201, and the pole 122, while also reducing impedance and improving current carrying capacity. For example, d0 can be set to 2mm, 4mm, or 8mm to achieve a more optimal distance between the main body 35 and the center of the pole 122.

[0144] According to some embodiments of the present application, in combination with Figures 4, 5 and 10, the pole 122 is passed through the cover plate 121, and a first insulating separator 124 and a seal 127 are provided between the outer peripheral surface of the pole 122 and the cover plate 121. The seal 127 is sleeved on the pole 122, and the first insulating separator 124 is provided on the outer peripheral side of the seal 127 and the pole 122.

[0145] For example, in the examples of Figures 4, 5, and 10, the lower end of pole 122 is connected to the first current collecting plate 3 after being passed through the cover plate 121. A seal 127 is sleeved on the outer circumference of pole 122. The first insulating spacer 124 is located on the outer circumference of the seal 127 and the lower portion of pole 122. Seal 127 is annular and serves as an insulating member. As a result, pole 122 passes through the first insulating spacer 124, seal 127, and cover plate 121 in sequence. The pole 122 and cover plate 121 compress seal 127, thereby strengthening the tightness of the connection between pole 122, first insulating spacer 124, seal 127, and cover plate 121, thereby improving the sealing of cover plate assembly 12. Furthermore, it provides insulation between cover plate 121 and pole 122, effectively preventing short circuits between cover plate 121 and pole 122. In addition, by providing the first insulating separator 124, the lower part of the pole 122 is effectively separated from the lower surface of the cover 121, which can effectively prevent the current on the pole 122 from flowing onto the cover 121, thereby preventing a short circuit between the pole 122 and the cover 121, which is beneficial to the normal use of the pole 122 and the cover 121.

[0146] According to some embodiments of the present application, in combination with Figures 4, 5 and 10, the battery cell 100 further includes a connector 126 and a second insulating separator 125, the connector 126 is connected to an end of the pole 122 away from the first current collecting disc 3 along the thickness direction of the first current collecting disc 3, and the second insulating separator 125 is arranged between the connector 126 and the cover plate 121.

[0147] For example, in the example of FIG10 , the upper end of the pole 122 passes through the cover plate 121, the second insulating spacer 125, and the connector 126, and is then riveted and welded to the connector 126. Thus, the connector 126 can limit the upper end of the pole 122, thereby preventing the pole 122 from moving downward and separating from the cover plate 121, thereby improving the stability of the connection between the pole 122 and the cover plate 121. Furthermore, the connector 126 cooperates with the upper end of the pole 122. Through the cooperation between the pole 122 and the connector 126, the tightness of the overall connection between the pole 122, the first insulating spacer 124, the cover plate 121, the second insulating spacer 125, and the connector 126 is strengthened, thereby improving the integrity of the cover plate assembly 12 and further facilitating its use. Furthermore, the sealing of the assembly of the connector 126, the pole 122, and the cover plate 121 is also improved, thereby improving the sealing of the cover plate assembly 12. In addition, the current of the first current collecting disc 3 can smoothly flow through the pole 122 and then flow out, thereby shortening the flow path of the current and reducing the structural impedance of the battery cell 100 .

[0148] For example, in the examples of Figures 10, 12, and 13, the first insulating separator 124 and the second insulating separator 125 are respectively located on either side of the thickness direction of the cover plate 121, and the upper end of the pole 122 passes through the first insulating separator 124, the cover plate 121, and the second insulating separator 125 in sequence. As a result, the second insulating separator 125 can insulate and separate the connector 126 from the cover plate 121, effectively preventing the current on the pole 122 and the connector 126 from flowing to the cover plate 121, thereby preventing a short circuit between the pole 122, the connector 126, and the cover plate 121, thereby facilitating the normal use of the battery cell 100.

[0149] Further, referring to FIG10 , a second insulating separator groove 1251 is formed on the second insulating separator 125. The connector 126 fits within the second insulating separator groove 1251. The connector 126 is insulated from the cover plate 121 by the second insulating separator 125. For example, in the example of FIG10 , the second insulating separator groove 1251 is formed on the upper side of the second insulating separator 125. The lower side of the connector 126 abuts against the bottom wall of the second insulating separator groove 1251. The first pole segment 1221 of the pole 122 passes through the second insulating separator groove 1251 and is connected to the connector 126. With this arrangement, the second insulating separator groove 1251 can position the connector 126, thereby facilitating rapid assembly of the connector 126 with the second insulating separator 125, thereby improving assembly efficiency and precision of the connector 126 with the second insulating separator 125. Furthermore, the second insulating spacer groove 1251 acts as a limiter for the connector 126, thereby preventing the connector 126 from rotating within the plane of the second insulating spacer 125. This improves the connection stability between the connector 126 and the second insulating spacer 125, and thus enhances the assembly stability of the cover assembly 12. Furthermore, the second insulating spacer 125 serves to separate the connector 126 from the cover 121, thereby preventing short circuits in the battery cell 100 caused by the electrical connection between the connector 126 and the cover 121. The connector 126 increases the welding (e.g., laser welding) area between the first current collecting tray 3 and the first tab 201 of the battery cell 100.

[0150] According to some embodiments of the present application, referring to Figure 10, the pole 122 includes a first pole segment 1221 and a second pole segment 1222 connected to each other, the first pole segment 1221 passes through the cover plate 121 and the second insulating separator 125 and is connected to the connector 126, the second pole segment 1222 is located on the side of the cover plate 121 facing the first current collecting disk 3, and the second pole segment 122 is connected to the first current collecting disk 3.

[0151] For example, in the example of FIG10 , the first pole segment 1221 extends in the vertical direction. The upper end of the first pole segment 1221 extends through the cover plate 121 and the second insulating spacer 125. The lower end of the first pole segment 1221 is connected to the upper side of the second pole segment 1222. The lower side of the second pole segment 1222 is connected to the upper surface of the first current collecting disc 3. The outer cross-sectional area of ​​the second pole segment 1222 is larger than the outer cross-sectional area of ​​the first pole segment 1221. This arrangement facilitates the connection between the first pole segment 1221 and the cover plate 121, while the second pole segment 1222 facilitates the connection between the pole 122 and the first current collecting disc 3. This facilitates the connection between the pole 122, the cover plate 121, and the first current collecting disc 3. Furthermore, the connection is stable, which facilitates the long-term use of the pole 122. In addition, the second pole section 1222 limits the pole 122 from the bottom side of the cover plate 121, restricting the upward movement of the pole 122, thereby improving the connection stability between the pole 122 and the cover plate 121, and further improving the overall stability of the cover plate 121. Moreover, the simple structure of the pole 122 facilitates the use of the pole 122 and also facilitates the production and processing of the pole 122.

[0152] According to some embodiments of the present application, referring to Figure 10, a cover plate through-hole 1212 is formed on the cover plate 121, the first pole segment 1221 passes through the cover plate through-hole 1212, at least a portion of the seal 127 is arranged between the outer peripheral surface of the first pole segment 1221 and the inner peripheral wall of the cover plate through-hole 1212, and the first insulating separator 124 is arranged on the outer peripheral side of the seal 127 and the second pole segment 1222.

[0153] For example, in the examples of Figures 4, 5, and 10, the cover plate through-hole 1212 penetrates the cover plate 121 along the thickness direction of the cover plate 121 (i.e., the vertical direction in Figure 2). A portion of the seal 127 is disposed on the outer circumference of the first pole segment 1221, and another portion of the seal 127 is located between the upper surface of the second pole segment 1222 and the lower surface of the cover plate 121. Of course, the seal 127 can also be entirely disposed between the outer circumference of the first pole segment 1221 and the inner circumferential wall of the cover plate through-hole 1212, with the upper portion of the first insulating spacer 124 separating the upper surface of the second pole segment 122 from the lower surface of the cover plate 121 to achieve an insulated connection between the pole 122 and the cover plate 121. In this manner, the cover plate through-hole 1212 facilitates positioning of the pole 122, thereby facilitating assembly of the pole 122 with the cover plate 121 and improving assembly efficiency of the cover plate 121. In addition, the seal 127 and the first insulating spacer 124 act together on the pole 122 to ensure the insulation connection between the pole 122 and the cover 121, while also further improving the sealing of the assembly of the connector 126, the pole 122 and the cover 121.

[0154] According to some embodiments of the present application, referring to Figures 12-14 , a rotation-stop groove 1242 is formed on a surface of the first insulating spacer 124 on a side adjacent to the first current collecting plate 3, and the second pole segment 1222 fits within the rotation-stop groove 1242. An extension portion 34 is provided on the first current collecting plate 3, at least a portion of the outer periphery of the extension portion 34 fits within the rotation-stop groove 1242, and the extension portion 34 is connected to a side of the second pole segment 1222 away from the cover plate 121.

[0155] For example, in the examples of Figures 12 and 13 , a stop groove 1242 is formed on the lower surface of the first insulating separator 124, and the outer circumference of the second pole segment 1222 abuts against the sidewalls of the stop groove 1242. The extension 34 is located within the stop groove 1242, with the outer circumference of the extension 34 abutting against the sidewalls of the stop groove 1242, and the upper surface of the extension 34 abuts against the lower surface of the second pole segment 1222. In other words, the shape of the edge of the extension 34 facing the stop groove 1242 and the shape of the edge of the second pole segment 1222 facing the stop groove 1242 match the shape of the stop groove 1242, allowing the extension 34 and the second pole segment 1222 to fit within the stop groove 1242. Of course, the stop groove 1242 can be formed by recessing the lower surface of the first insulating separator 124 away from the first current collecting plate 3, as long as it can limit the rotation of the second pole segment 1222. It should be noted that the above-mentioned "at least a part" means that only a part of the outer periphery of the extension portion 34 is fitted in the stop groove 1242, and the other part of the outer periphery of the extension portion 34 is located outside the stop groove 1242. Of course, it may also mean that the entire outer periphery of the extension portion 34 is fitted in the stop groove 1242. It can be set according to specific use to better meet actual applications.

[0156] With this arrangement, after the first insulating separator 124 is assembled with the pole 122 and the first current collecting disc 3, the anti-rotation groove 1242 acts as a limiter for the second pole segment 1222 and the extension 34, effectively preventing the pole 122 and the first current collecting disc 3 from rotating in a plane perpendicular to the vertical direction, thereby improving the assembly stability of the cover plate 121 with the first current collecting disc 3 and the pole 122. Furthermore, rotation of the first current collecting disc 3 and contact with the second current collecting disc 4 are prevented, thereby reducing the machining accuracy requirements for the pole core 20, the first pole tab 201, and the second pole tab 202, thereby improving the production efficiency of the pole core 20. Furthermore, when the first insulating separator 124 is assembled with the second pole segment 1222 and the extension 34, the anti-rotation groove 1242 facilitates the positioning of the second pole segment 1222 and the extension 34, thereby facilitating faster assembly of the first insulating separator 124 with the pole 122 and the first current collecting disc 3, thereby improving the assembly efficiency of the cover plate 121.

[0157] According to other embodiments of the present application, in conjunction with Figures 12 and 13 , a first insulating spacer 124 is provided with a rotation-stopping protrusion 1241 on a side surface adjacent to the first current collecting disc 3. The rotation-stopping protrusion 1241 and the side surface of the first insulating spacer 124 adjacent to the first current collecting disc 3 jointly define a rotation-stopping groove 1242. The side of the rotation-stopping groove 1242 adjacent to the center of the first current collecting disc 3 is open, and the second pole segment 1222 fits within the rotation-stopping groove 1242. An extension 34 is provided on the first current collecting disc 3, and at least a portion of the outer periphery of the extension 34 fits within the rotation-stopping groove 1242. The extension 34 is located on the side of the second pole segment 1222 away from the cover plate 121.

[0158] For example, in the examples of Figures 12 and 13 , the stop protrusion 1241 can be configured in a "C" shape. The shape of the stop protrusion 1241 matches the shape of the end of the second pole segment 1222 away from the first current collecting disc 3 and the shape of the side of the extension 34 away from the first current collecting disc 3. The side of the extension 34 away from the center of the first current collecting disc 3 is assembled with the stop protrusion 1241. This configuration facilitates the insertion of the extension 34 of the first current collecting disc 3 into the stop groove 1242 from the open side thereof in a direction perpendicular to the vertical direction, thereby facilitating the assembly of the extension 34 with the stop protrusion 1241, thereby improving the assembly efficiency of the first insulating spacer 124 and the first current collecting disc 3. Furthermore, this configuration facilitates sufficient contact between the stop protrusion 1241, the second pole segment 1222, and the extension 34, thereby enhancing the connection stability of the first insulating spacer 124, the pole 122, and the first current collecting disc 3. In addition, the structure of the anti-rotation protrusion 1241 is simple, thereby simplifying the structure of the first insulating spacer 124 and further facilitating mass production of the first insulating spacer 124. Of course, the anti-rotation protrusion 1241 is not limited to the above structure and can be a continuous or discontinuous column (for example, a plurality of columns arranged at intervals, wherein the plurality of bodies act together on the second pole segment 122 to limit the rotation) or a sphere, but is not limited thereto.

[0159] According to some embodiments of the present application, in conjunction with Figures 12 and 13 , at least a portion of the outer periphery of the extension portion 34 is adapted to the shape of the inner peripheral wall of the anti-rotation groove 1242. For example, in the examples of Figures 12 and 13 , the outer periphery of the extension portion 34 away from the center of the first collecting disc 3 is in contact with the inner peripheral wall of the anti-rotation groove 1242, and the side of the extension portion 34 away from the opening 1231 is formed into a flat surface. This facilitates full contact between the outer periphery of the first extension portion 34 away from the center of the first collecting disc 3 and the inner wall of the anti-rotation groove 1242, further improving the adaptability of the extension portion 34 and the anti-rotation groove 1242, and strengthening the limiting effect of the anti-rotation groove 1242 on the first collecting disc 3, thereby further preventing the first collecting disc 3 from rotating, thereby improving the operational stability of the cover plate 121.

[0160] Optionally, the pole 122 is connected to the first current collecting disc 3 by welding. This provides a more secure connection between the pole 122 and the first current collecting disc 3, preventing the first current collecting disc 3 from falling off the pole 122 and thereby improving the long-term stability of the first current collecting disc 3 and the pole 122. Furthermore, the welding method is simple, thereby improving the feasibility of the welding process. However, this is not the only limitation.

[0161] According to some embodiments of the present application, referring to FIG. 10 , the thickness of the first insulating spacer 124 is d6, where d6 satisfies the following: 0.5 mm ≤ d6 ≤ 2.0 mm. When the thickness d6 of the first insulating spacer 124 is greater than 2 mm, more material is used for the first insulating spacer 124, thereby increasing the production cost of the first insulating spacer 124 and, in turn, the production cost of the cover assembly 12. Furthermore, the space occupied by the first insulating spacer 124 increases, thereby increasing the overall volume of the cover assembly 12 and hindering the use of the cover assembly 12. When the thickness d6 of the first insulating spacer 124 is less than 0.5 mm, the thickness of the first insulating spacer 124 is small, making the production of the first insulating spacer 124 more difficult and making it difficult to manufacture. Furthermore, the wear resistance of the first insulating spacer 124 is reduced, making the first insulating spacer 124 susceptible to friction damage, thereby shortening the service life of the first insulating spacer 124. Thus, by ensuring that the thickness d6 of the first insulating spacer 124 satisfies 0.5 mm ≤ d6 ≤ 2.0 mm, the production cost of the first insulating spacer 124 is reduced, thereby reducing the production cost of the cover assembly 12. Furthermore, the moderate thickness of the first insulating spacer 124 facilitates production of the first insulating spacer 124. Furthermore, the wear resistance of the first insulating spacer 124 is improved, thereby preventing damage to the first insulating spacer 124 and extending the service life of the first insulating spacer 124. It should be noted that the first insulating spacer 124 can be a plate-shaped or approximately plate-shaped structure, and the aforementioned thickness d6 refers to the thickness of the main portion of the plate-shaped structure, excluding the anti-rotation protrusion 1241 or the recessed area.

[0162] Optionally, the first insulating separator 124 is an injection-molded part. This improves the molding quality of the first insulating separator 124, and also improves the production efficiency and processing accuracy of the first insulating separator 124. Furthermore, the integrity of the first insulating separator 124 is also improved, thereby facilitating the long-term use of the first insulating separator 124.

[0163] According to some embodiments of the present application, referring to Figures 4 and 5 , a cover protrusion 1213 is provided on a side surface of the cover plate 121 adjacent to the first insulating spacer 124, and a cover through-hole 1212 extends through the cover protrusion 1213. A first insulating spacer groove 1243 is formed on a side surface of the first insulating spacer 124 adjacent to the cover plate 121, and a first insulating spacer through-hole 1244 is formed on the bottom wall of the first insulating spacer groove 1243. The first pole segment 1221 extends through the first insulating spacer through-hole 1244, and the cover protrusion 1213 fits within the first insulating spacer groove 1243.

[0164] For example, in the examples of Figures 4, 5, and 10, first insulating spacer through-hole 1244 extends through first insulating spacer 124 along its thickness. First insulating spacer through-hole 1244 opposes cover plate through-hole 1212. First pole segment 1221 sequentially passes through first insulating spacer through-hole 1244 and cover plate through-hole 1212 to extend above cover plate 121. The lower surface of cover plate protrusion 1213 contacts the bottom wall of first insulating spacer groove 1243, while the outer circumference of cover plate protrusion 1213 contacts the inner sidewall of first insulating spacer groove 1243. Thus, through the mating of cover plate protrusion 1213 and first insulating spacer groove 1243, first insulating spacer groove 1243 positions cover plate protrusion 1213, thereby facilitating rapid assembly of cover plate 121 and first insulating spacer 124, thereby improving assembly efficiency of cover plate assembly 12. In addition, the cover plate protrusion 1213 has a simple structure, which is conducive to the assembly of the cover plate 121 and other components. It also simplifies the structure of the cover plate 121 and is conducive to the production and processing of the cover plate 121.

[0165] Optionally, referring to Figures 4, 5, and 10, cover plate protrusion 1213 is formed by a portion of a side surface of cover plate 121 that protrudes toward a side surface of first current collecting tray 3. For example, in the examples of Figures 4, 5, and 10, cover plate protrusion 1213 is formed by a portion of the upper surface of cover plate 121 that protrudes downward. This configuration simplifies the structure of cover plate protrusion 1213 and facilitates production and processing, thereby improving the production efficiency of cover plate 121. Furthermore, the integrity of cover plate 121 is improved, thereby enhancing the structural strength of cover plate protrusion 1213 and improving the long-term stability of cover plate 121.

[0166] According to some embodiments of the present application, referring to Figures 5 and 10, the cover plate protrusion 1213 forms a cover plate groove 1214 on the side surface of the cover plate 121 away from the first collecting plate 3, and at least a portion of the second insulating spacer 125 is fitted into the cover plate groove 1214.

[0167] For example, in the examples of Figures 5 and 10 , a cover protrusion 1213 is provided on the lower side of the cover plate 121, and a cover groove 1214 is formed at a corresponding position on the upper side of the cover plate 121. The cover through-hole 1212 penetrates the bottom wall of the cover groove 1214 and the cover protrusion 1213. The second insulating spacer 125 fits within the cover groove 1214, and the outer peripheral surface of the second insulating spacer 125 abuts against the inner wall of the cover groove 1214. With this arrangement, the cover groove 1214 can position the second insulating spacer 125, facilitating assembly of the cover plate 121 and the second insulating spacer 125, thereby improving assembly efficiency of the cover plate assembly 12. In addition, the cover plate groove 1214 can limit the second insulating separator 125, preventing the second insulating separator 125 from rotating within the plane of the cover plate 121, thereby improving the connection stability between the cover plate 121 and the second insulating separator 125, and further improving the stability of the cover plate assembly 12. It should be noted that the above-mentioned "at least a portion" means that a portion of the second insulating separator 125 fits within the cover plate groove 1214, and the other portion of the second insulating separator 125 is located outside the cover plate groove 1214. Of course, it can also mean that the second insulating separator 125 is fully fitted within the second insulating separator 125. As long as the separation between the cover plate 121 and the connector 126 can be better achieved, it can be set according to the specific use to better meet the actual application.

[0168] Optionally, the connector 126 is polygonal or oblong. For example, when the connector 126 is polygonal, the contact area between the connector 126 and the second insulating separator 125 is larger, which increases the pressing area of ​​the connector 126 on the second insulating separator 125, thereby improving the tightness of the assembly of the connector 126 and the second insulating separator 125, and further improving the connection tightness of the various components of the cover assembly 12. When the connector 126 is oblong, the contact area and welding surface between the connector 126 and the second insulating separator 125 are increased. In addition, the structure of the connector 126 is simple and easy to produce, thereby improving the production efficiency of the connector 126. In addition, the four corners of the connector 126 can be set to arc shape, which is convenient for installation and transportation and improves the aesthetics of the connector 126.

[0169] According to some embodiments of the present application, referring to FIG15 , the width of the connector 126 is w, and the diameter of the pole 122 is d7, wherein w and d7 satisfy the following conditions: 3.5 mm ≤ w - d7 ≤ 6 mm. For example, when the difference between the width w of the connector 126 and the diameter d7 of the pole 122 is greater than 6 mm, the connection area between the connector 126 and the pole 122 is small, and the width of the connector 126 is large, which reduces the connection stability between the connector 126 and the pole 122. When the difference between the width w of the connector 126 and the diameter d7 of the pole 122 is less than 3.5 mm, the distance between the edge of the connector 126 in the width direction and the edge of the upper end of the pole 122 is small, and the width of the connector 126 is also small, which reduces the structural strength of the connector 126 and is not conducive to the long-term use of the connector 126. Therefore, by setting the width w of the connector 126 and the diameter d7 of the pole 122 to satisfy 3.5mm≤w-d7≤6mm, the distance between the edge of the connector 126 in the width direction and the edge of the upper end of the pole 122 is moderate, which improves the structural strength of the connector 126 and also improves the connection stability between the connector 126 and the pole 122, which is conducive to the long-term and stable use of the connector 126 and the pole 122.

[0170] Optionally, connector 126 is a stamped aluminum part. This allows for high production efficiency and precision, thus facilitating the long-term use of connector 126. Furthermore, stamping aluminum improves the flatness of connector 126. Furthermore, aluminum has excellent electrical conductivity, facilitating the flow of current through connector 126.

[0171] According to some embodiments of the present application, referring to Figures 4, 5, and 10, seal 127 includes a first sealing segment 1271 and a second sealing segment 1272. First sealing segment 1271 is positioned between the outer circumference of pole 122 and the inner circumference of cover plate through-hole 1212. Second sealing segment 1272 is connected to the end of first sealing segment 1271 adjacent to first current collecting disc 3. Second sealing segment 1272 is positioned between first insulating spacer 124 and first pole segment 1221. For example, in the examples of Figures 4, 5, and 10, first sealing segment 1271 is positioned above second sealing segment 1272, and the outer circumference of seal 127 is stepped. First sealing segment 1271 is positioned between the outer circumference of first pole segment 1221 and the inner circumference of cover plate through-hole 1212, with the upper surface of first sealing segment 1271 contacting the lower surface of second insulating spacer 125. The upper surface of the second sealing section 1272 abuts the lower surface of the cover plate protrusion 1213, and the lower surface of the second sealing section 1272 contacts the upper surface of the second pole section 1222. This arrangement strengthens the tightness of the connection between the pole 122, the cover plate 121, and the first insulating spacer 124, thereby further improving the sealing performance of the cover plate assembly 12 and the insulation between the cover plate 121 and the pole 122, thereby enhancing the performance of the cover plate assembly 12. Furthermore, the simple structure of the seal 127 facilitates production, thereby improving the production efficiency of the seal 127.

[0172] Optionally, seal 127 is injection molded from fluororubber. Fluororubber exhibits excellent corrosion and atmospheric aging resistance, thereby extending the service life of seal 127. Furthermore, injection molding improves the molding quality and overall stability of seal 127, as well as the production efficiency and processing accuracy of seal 127, thereby further facilitating the long-term use of seal 127.

[0173] Further, referring to Figures 2, 3, and 21, the battery cell 100 includes a separator 7, which is disposed within the housing 11. The separator 7 is located between the end of the pole core 20 away from the first pole tab 201 and the inner wall of the housing 11. The pole core 20 is isolated from the inner wall of the housing 11 by the separator 7. For example, in the examples of Figures 2, 3, and 21, the separator 7 is disposed at one end of the housing 11 in the vertical direction, and is located between the lower end of the pole core 20 and the bottom wall of the housing 11. In this arrangement, the separator 7 separates the pole core 20 from the housing 11, thereby preventing the current carrying the pole core 20 from passing through the housing 11, thereby reducing the structural impedance of the battery cell 100. Furthermore, the end of the electrode core 20 adjacent to the separator 7 does not contact the bottom wall of the housing 11. The separator 7 protects the electrode core 20, preventing damage to the electrode core 20 from direct contact with the housing 11. This extends the service life of the electrode core 20, and thus the service life of the battery cell 100. Furthermore, the separator 7 is easy to install; simply place it inside the housing 11, improving the efficiency of assembling the battery cell 100.

[0174] According to some embodiments of the present application, with reference to Figures 2 and 22-24 , at least one through-hole 71 is formed in the separator 7. For example, in the examples of Figures 2 and 22-24 , the through-hole 71 extends through the separator 7 along the thickness direction of the separator 7 (e.g., the vertical direction in Figure 2 ). This arrangement allows the electrolyte to be stored in the through-hole 71, thereby increasing the storage space for the electrolyte, thereby reducing the risk of electrolyte overflow and preventing damage to the battery cell 100.

[0175] Referring to Figures 18 and 19 , a pressure relief device 14 is provided on the housing 1. The pressure relief device 14 is configured to relieve the internal pressure of the battery cell 100 and is located on a side of the housing 1 away from the separator 7 . For example, in the examples shown in Figures 18 and 19 , the pressure relief device 14 is located on the outer wall of the lower end of the housing 1 . With this arrangement, when the gas level inside the battery cell 100 reaches a threshold, the gas inside the battery cell 100 can be released through the pressure relief device 14 , thereby relieving the pressure in the battery cell 100 and facilitating its normal use.

[0176] According to some embodiments of the present application, referring to FIG19 , the housing 1 includes a housing body 111 and a bottom cover plate 112 connected to each other, the separator 7 separates the pole core 2 from the bottom cover plate 112, and the pressure relief device 14 is provided on the bottom cover plate 112. For example, in the example of FIG6 , the bottom cover plate 112 is located at the lower end of the housing body 111, the bottom cover plate 112 and the housing body 111 are connected by welding, and the pressure relief device 14 is provided on the side wall of the bottom cover plate 112 away from the separator 7. Thus, by setting the housing 1 in a split manner, the processing accuracy of the housing body 111 and the bottom cover plate 112 is improved, thereby improving the processing accuracy of the housing 1. Exemplarily, the pressure relief device 14 is provided on the bottom cover plate 112 of the housing body 111, and the pressure relief device 14 and the bottom cover plate 112 can be an integrally formed structure or a separately set structure. For example, the pressure relief device 14 is a region of the bottom cover plate 112 with a weak structure, such as a region of the bottom cover plate 112 with a notched groove. Of course, the pressure relief device 14 and the bottom cover plate 112 can also be separate structures, and the pressure relief device 14 can be connected to the bottom cover plate 112 by welding or other methods. Accordingly, the pressure relief device 14 can be, for example, an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve. It should be noted that the pressure relief device 14 can also be provided on the housing body 111 to relieve pressure within the battery cell 100.

[0177] 18 and 19 , at least a portion of the pressure relief device 14 is opposite to the through hole 71 along the thickness direction of the separator 7. For example, in the examples of FIG18 and FIG19 , at least a portion of the pressure relief device 14 is connected to the through hole 71. In this way, the through hole 71 has the function of an exhaust channel. When the pressure inside the battery cell 100 is too high, the gas inside the battery cell 100 can flow to the pressure relief device 14 through the through hole 71, and then be discharged to the outside of the battery cell 100, which is beneficial to the pressure relief of the battery cell 100 and the smooth opening of the pressure relief device 14, thereby improving the safety of the battery cell 100. It should be noted that the above-mentioned "at least a portion" refers to only a portion or all of the pressure relief device 14, which can be set according to the specific use to better meet the actual application.

[0178] According to some embodiments of the present application, the area where the projection of at least a portion of the pressure relief device 14 on the partition 7 along the thickness direction of the partition 7 overlaps with the through hole 71 is S1 (that is, the area of ​​the pressure relief device 14 opposite to the through hole 71 along the thickness direction of the partition 7), and the cross-sectional area of ​​the pressure relief device 14 along a plane perpendicular to the thickness direction of the partition 7 (that is, the cross-sectional area of ​​the pressure relief device 14 along a plane perpendicular to the up and down directions) is S2, wherein S1 and S2 satisfy: 50%≤S1 / S2≤100%. For example, when the ratio S1 / S2 of the area S1 of at least a portion of the pressure relief device 14 opposing the through-hole 71 along the thickness direction of the separator 7 to the cross-sectional area S2 of the pressure relief device 14 is less than 50%, the cross-sectional area of ​​the exhaust passage of the pressure relief device 14 is small. Consequently, after the pressure relief device 14 is activated, the amount of gas flowing through the exhaust passage of the pressure relief device 14 per unit time is small, thereby reducing the exhaust speed of the battery cell 100 and hindering the pressure relief of the battery cell 100. Therefore, by ensuring that the area S1 of at least a portion of the pressure relief device 14 opposing the through-hole 71 along the thickness direction of the separator 7 and the cross-sectional area S2 of the pressure relief device 14 satisfy the relationship of 50%≤S1 / S2≤100%, the pressure relief capacity of the pressure relief device 14 is effectively guaranteed, and the pressure relief area of ​​the battery cell 100 is ensured. Consequently, after the pressure relief device 14 is activated, the amount of gas flowing through the exhaust passage of the pressure relief device 14 per unit time is large, thereby increasing the exhaust speed of the battery cell 100 and improving the safety of the battery cell 100.

[0179] According to some embodiments of the present application, the cross-sectional area of ​​the through-hole 71 along a plane perpendicular to the thickness of the separator 7 is S3, and the cross-sectional area of ​​the separator 7 along a plane perpendicular to the thickness of the separator 7 is S4, where S3 and S4 satisfy the following: 30% ≤ S3 / S4 ≤ 80%. For example, when the ratio S3 / S4 of the cross-sectional area S3 of the through-hole 71 along a plane perpendicular to the thickness of the separator 7 to the cross-sectional area S4 of the separator 7 along a plane perpendicular to the thickness of the separator 7 is less than 30%, the cross-sectional area of ​​the through-hole 71 is small, resulting in a small storage space for the electrolyte, which in turn makes it easy for the electrolyte to overflow during injection and damage the battery cell 100. In addition, the small size of the through-hole 71 makes it difficult to inject the electrolyte into the battery cell 100. When the ratio (S3 / S4) of the cross-sectional area S3 of through-hole 71 along a plane perpendicular to the thickness of separator 7 to the cross-sectional area S4 of separator 7 along a plane perpendicular to the thickness of separator 7 is greater than 80%, through-hole 71 occupies a large space in separator 7, reducing the structural strength of separator 7 and hindering its long-term use. Therefore, by ensuring that the cross-sectional area S3 of through-hole 71 along a plane perpendicular to the thickness of separator 7 and the cross-sectional area S4 of separator 7 along a plane perpendicular to the thickness of separator 7 satisfy the ratio of 30% ≤ S3 / S4 ≤ 80%, electrolyte storage space is increased, the risk of electrolyte overflow is reduced, and damage to battery cell 100 is avoided. Furthermore, the structural strength of separator 7 is maintained, thereby enhancing its protective effect on electrode core 20 and extending the service life of battery cell 100.

[0180] According to some embodiments of the present application, referring to Figures 21 and 22, there are multiple through holes 71. In the description of the present application, "multiple" means two or more than two. The multiple through holes 71 constitute at least one first through hole group 72 and at least one second through hole group 73. The first through hole group 72 includes a plurality of first through holes 721, and the plurality of first through holes 721 are spaced apart along the radial direction of the separator 7. The second through hole group 73 includes a plurality of second through holes 731, and the plurality of second through holes 731 are spaced apart along the circumferential direction of the separator 7. The plurality of second through holes 731 and the plurality of first through holes 721 are spaced apart from each other.

[0181] For example, in the example of FIG. 22 , the second through-hole group 73 includes four second through-holes 731, which are spaced apart along the circumference of the separator 7. The first through-hole group 72 and the second through-hole group 73 are spaced apart from each other, with multiple first through-holes 721 disposed between adjacent second through-holes 731. This arrangement provides a suitable number and arrangement of through-holes 71, further increasing electrolyte storage space and thereby preventing electrolyte overflow and, consequently, damage to the battery cell 100. Furthermore, the material usage of the separator 7 is reduced, thereby lowering the production cost of the separator 7 and reducing the weight of the separator 7, thereby reducing the weight of the battery cell 100. Furthermore, at least one of the multiple through-holes 71 is positioned opposite the pressure relief device 14, ensuring communication between the through-hole 71 and the pressure relief device 14, improving smooth gas discharge, and facilitating assembly of the separator 7 (that is, even after the separator 7 is rotated along its central axis, the through-hole 71 can still be positioned opposite the pressure relief device 14). Moreover, the layout of the first through-hole group 72 and the second through-hole group 73 is reasonable. While ensuring the normal use of the separator 7, it can also improve the structural strength of the separator 7, thereby improving the stability of the separator 7 during long-term use and enhancing the aesthetics of the separator 7. It should be noted that the number and arrangement of the first through-holes 721, as well as the number and arrangement of the second through-holes 731, can be specifically set according to actual use to better meet practical applications. For example, referring to Figures 21-23, there are schematic diagrams of the separator 7 relative to the pressure relief device 14 in different states after being rotated to a certain angle.

[0182] According to some embodiments of the present application, referring to FIG. 21 , the cross-sectional area of ​​the second through-hole 731, as measured along a plane perpendicular to the thickness of the separator 7, is greater than the cross-sectional area of ​​the first through-hole 721, as measured along a plane perpendicular to the thickness of the separator 7. For example, in the example of FIG. 21 , the first through-hole 721 can be circular, while the second through-hole 731 can be polygonal, with the second through-hole 731 extending in a curved shape along the circumference of the separator 7. This arrangement allows the separator 7 to be positioned at any angle along its circumference when assembled with the housing 1. Specifically, when the separator 7 is rotated relative to the housing 1, the second through-hole 731 can be aligned with the pressure relief device 14. This facilitates pressure relief in the battery cell 100, effectively ensuring the proper operation of the pressure relief device 14 and further improving the safety of the battery cell 100. Furthermore, the aesthetics of the separator 7 are enhanced. Furthermore, the simple structure of the first and second through-holes 721 and 731 facilitates manufacturing and processing, facilitating mass production of the separator 7. It should be noted that the shapes of the first through hole 721 and the second through hole 731 can be specifically set according to actual usage to better meet practical applications.

[0183] According to some embodiments of the present application, referring to FIG21 , the cross-sectional areas of the plurality of first through holes 721 along a plane perpendicular to the thickness direction of the separator 7 are all the same. This improves the balance of the separator 7, thereby increasing the stability of the separator 7 after installation, and also simplifies the structure of the separator 7, facilitating mass production of the separator 7.

[0184] According to other embodiments of the present application, referring to FIG. 21 , at least two of the plurality of first through holes 721 have different cross-sectional areas along a plane perpendicular to the thickness direction of the separator 7. Thus, while ensuring the structural strength of the separator 7, a plurality of first through holes 721 with different cross-sectional areas can be provided to increase the cross-sectional areas of the plurality of through holes 71, thereby facilitating the first through holes 721 to be opposite to the pressure relief device 14, while also effectively increasing the electrolyte storage space. Furthermore, it is convenient to reasonably arrange the first through holes 721 according to the arrangement of the second through holes 731, making the arrangement of the plurality of first through holes 721 and the plurality of second through holes 731 more compact, thereby optimizing the spatial design of the separator 7.

[0185] According to some embodiments of the present application, referring to FIG21 , there are multiple first through hole groups 72 , and the multiple first through hole groups 72 are arranged at intervals along the circumference of the separator 7 , and the second through hole 731 is located between two adjacent first through hole groups 72 . For example, in the example of FIG21 , there are four first through hole groups 72 , and the four first through hole groups 72 and the four second through holes 731 are arranged at intervals along the circumference of the separator 7 , and the first through hole group 72 and the second through hole 731 are symmetrical along the center of the separator 7 . With such an arrangement, the weight of the separator 7 is further reduced and the electrolyte storage space is further increased through the combined effect of the multiple first through hole groups 72 . In addition, the aesthetics of the separator 7 is improved, and the stability of the separator 7 is improved, so that the separator 7 can better protect the electrode core 20 , and it is also conducive to the mass production of the separator 7 .

[0186] According to some embodiments of the present application, referring to FIG. 22 , the minimum distance between any second through hole 731 and a first through hole 721 of an adjacent first through hole group 72 adjacent to the edge of the separator 7 is l1, where l1 satisfies the following: 0.5 mm ≤ l1 ≤ 3 mm. For example, when the minimum distance l1 between any second through hole 731 and a first through hole 721 of an adjacent first through hole group 72 adjacent to the edge of the separator 7 is less than 0.5 mm, the distance between the second through hole 731 and the first through hole 721 of the adjacent first through hole group 72 adjacent to the edge of the separator 7 is relatively close, thereby reducing the structural strength of the separator 7, making the separator 7 more susceptible to breakage, and thereby shortening the service life of the separator 7. When the minimum distance l1 between any second through hole 731 and the first through hole 721 of the adjacent first through hole group 72 adjacent to the edge of the separator 7 is greater than 3 mm, after the separator 7 is installed, the connection between any second through hole 731 and the first through hole 721 of the adjacent first through hole group 72 adjacent to the edge of the separator 7 is likely to block the pressure relief device 14, thereby affecting the exhaust of the pressure relief device 14 and further hindering the normal use of the battery cell 100. Therefore, by setting the minimum distance l1 between any second through hole 731 and the first through hole 721 of the adjacent first through hole group 72 adjacent to the edge of the separator 7 to meet 0.5 mm ≤ l1 ≤ 3 mm, the layout of the first through holes 721 and the second through holes 731 is rationalized, the structural strength of the separator 7 is improved, thereby enhancing the protective effect of the separator 7 on the battery cell 100 and extending the service life of the separator 7. In addition, the through hole 71 is advantageously opposite the pressure relief device 14, thereby increasing the exhaust channel of the pressure relief device 14 and allowing gas to be smoothly discharged out of the battery cell 100.

[0187] According to other embodiments of the present application, referring to FIG. 22 , the minimum distance between two adjacent first through holes 721 of the first through hole group 72 adjacent to the edge of the separator 7 is l2, where l2 satisfies the following: 0.5 mm ≤ l2 ≤ 3 mm. For example, when the minimum distance l2 between two adjacent first through holes 721 of the first through hole group 72 adjacent to the edge of the separator 7 is less than 0.5 mm, the connection between the two adjacent first through holes 721 of the first through hole group 72 adjacent to the edge of the separator 7 is narrow, thereby reducing the structural strength of the separator 7, making the separator 7 susceptible to breakage and damage, and thus shortening the service life of the separator 7. When the minimum distance l2 between two adjacent first through holes 721 of the first through hole group 72 adjacent to the edge of the separator 7 is greater than 3 mm, after the separator 7 is installed, the connection between the two adjacent first through holes 721 of the first through hole group 72 adjacent to the edge of the separator 7 blocks a large area of ​​the pressure relief device 14, thereby easily affecting the exhaust of the pressure relief device 14 and being detrimental to the safe use of the battery cell 100. Thus, by setting the minimum distance l2 between two adjacent first through holes 721 of the first through hole group 72 adjacent to the edge of the separator 7 to meet 0.5mm≤l2≤3mm, the distance between two adjacent first through holes 721 is moderate, thereby improving the structural strength of the separator 7 and facilitating the normal use of the separator 7. In addition, the through holes 71 are advantageously opposite to the pressure relief device 14, thereby increasing the exhaust channel of the pressure relief device 14 and allowing gas to be smoothly discharged outside the battery cell 100.

[0188] According to some further embodiments of the present application, referring to FIG22 , the minimum distance between any second through hole 731 and the first through hole 721 of the adjacent first through hole group 72 adjacent to the edge of the separator 7 is l1, wherein l1 satisfies: 0.5mm≤l1≤3mm. At the same time, the minimum distance between two adjacent first through holes 721 of the adjacent edge of the separator 7 of the first through hole group 72 is l2, wherein l2 satisfies: 0.5mm≤l2≤3mm. Thus, the structural strength of the separator 7 is improved, thereby improving the protective effect of the separator 7 on the pole core 20 and extending the service life of the separator 7. In addition, the pressure relief device 14 is easily connected to the through hole 71, so that when the gas pressure inside the battery cell 100 is too high, the gas can be smoothly discharged through the through hole 71 and the pressure relief device 14, thereby improving the safety of the battery cell 100.

[0189] Further, referring to Figure 22, the thickness of the separator 7 is h6, wherein h6 satisfies: 0.3mm≤h6≤2mm. For example, when the thickness h6 of the separator 7 is less than 0.3mm, the spatial volume of the through hole 71 is small, so that the amount of electrolyte stored in the through hole 71 is small, which makes the electrolyte easy to overflow, causing the battery cell 100 to be easily damaged. When the thickness h6 of the separator 7 is greater than 2mm, the space occupied by the separator 7 in the outer shell 1 (that is, in the accommodating cavity 13) is large, thereby reducing the space utilization rate inside the outer shell 1. Therefore, by setting the thickness h6 of the separator 7 to satisfy 0.3mm≤h6≤2mm, the storage space for the electrolyte is increased, thereby preventing the electrolyte from overflowing during injection, and rationalizing the space occupied by the separator 7 in the outer shell 1, thereby improving the space utilization rate inside the outer shell 1.

[0190] According to some optional embodiments of the present application, the separator 7 is a polyethylene terephthalate piece or a polypropylene piece. When the separator 7 is set to a polyethylene terephthalate piece, the polyethylene terephthalate piece has electrical insulation, thereby hindering the current on the pole core 20 from flowing to the housing 1, thereby reducing the structural impedance. When the separator 7 is set to a polypropylene piece, polypropylene also has electrical insulation, thereby reducing the structural impedance, and the material source is wide. In addition, polypropylene has high-strength mechanical properties and good high-wear-resistant processing properties, thereby improving the protective effect of the separator 7 on the pole core 20 and extending the service life of the separator 7.

[0191] Optionally, the separator 7 is formed by injection molding, thereby improving the molding quality of the separator 7 and also improving the production efficiency and processing accuracy of the separator 7.

[0192] Further optionally, referring to Figures 18 and 19, the pressure relief device 14 is welded to the housing 1, and a protective member 141 is provided on the side of the pressure relief device 14 away from the housing 1. For example, in the examples of Figures 18 and 19, the protective member 141 is opposite to the pressure relief device 14, and the protective member 141 is assembled with the housing 1. This arrangement increases the connection strength between the pressure relief device 14 and the housing 1, and prevents the pressure relief device 14 from falling off from the housing 1. In addition, the protective member 141 can protect the pressure relief device 14, thereby extending the service life of the pressure relief device 14. For example, the protective member 141 is injection molded by polyester resin. As a result, the production and processing of the protective member 141 is facilitated, the processing efficiency of the protective member 141 is improved, and the structural strength of the protective member 141 is also improved, which is beneficial to the long-term use of the protective member 141.

[0193] According to some optional embodiments of the present application, the pressure relief device 14 is formed by stamping or laser scoring steel, and has an initiation pressure of P, where P satisfies the following conditions: 0.5 MPa ≤ P ≤ 2 MPa. This allows for high production efficiency and precision in the pressure relief device 14, thereby improving the assembly precision of the pressure relief device 14 with the housing 1 and facilitating long-term use of the pressure relief device 14.

[0194] Alternatively, referring to Figure 19 , the housing body 111 can be formed cylindrically by stamping steel or by winding and welding sheet material, and the bottom cover plate 112 can be re-formed by stamping steel, where the steel is corrosion-resistant. This strengthens the connection between the bottom cover plate 112 and the circumferential sidewalls of the housing body 111, thereby increasing the structural strength of the housing 11 and facilitating the long-term, stable use of the housing 11. Furthermore, the steel stamping process improves the flatness of the bottom cover plate 112.

[0195] Furthermore, referring to Figures 18 and 19 , the bottom surface of the bottom cover 112 is formed with reinforcing ribs 1121. For example, in the examples shown in Figures 18 and 19 , the reinforcing ribs 1121 are recessed from the bottom surface of the bottom cover 112 toward the top surface of the bottom cover 112. The reinforcing ribs 1121 are radially opposite to the installation location of the pressure relief device 14 on the bottom cover 112. Thus, the reinforcing ribs 1121 enhance the structural strength of the bottom cover 112, thereby enhancing the structural strength of the housing 11.

[0196] Optionally, the electrode core 20 is formed by winding, and the tabs are flattened or cut and stacked. The tabs are divided into two sides: one side is a first tab 201 (e.g., a positive tab), which is connected to the first current collecting plate 3, and the other side is a second tab 202 (e.g., a negative tab), which is connected to the second current collecting plate 4. The first tab 201 and the second tab 202 are spaced apart in the radial direction of the electrode core 20. This facilitates the production of the electrode core 20. In addition, it prevents the first tab 201 and the second tab 202 from overlapping and causing a short circuit, thereby facilitating the normal use of the battery cell 100 for a long time and extending the service life of the battery cell 100.

[0197] Further optionally, referring to FIG. 17 , a central hole 203 is provided in the central region of the electrode core 20. The central hole 203 is located between the first electrode tab 201 and the second electrode tab 202. The opposing sides of the first electrode tab 201 and the second electrode tab 202 are tangential to the edge of the central hole 203. The diameter of the central hole 203 is d8, where d8 satisfies the following: 2 mm ≤ d8 ≤ 10 mm. When the diameter d8 of the central hole 203 is greater than 10 mm, the area of ​​the first and second electrode tabs 201 and 202 is small, thereby reducing the contact area between the first and second electrode tabs 201 and 202 and the corresponding first and second current collecting plates 3 and 4, which is detrimental to the normal operation of the battery cell 100. When the diameter d8 of the central hole 203 is less than 2 mm, the spacing between the first and second electrode tabs 201 and 202 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 d8 of the center hole 203 to satisfy 2mm≤d8≤10mm, the contact area between the first pole tab 201 and the second pole tab 202 and the corresponding first collecting disc 3 and the second collecting disc 4 can be increased, thereby reducing the impedance of the battery cell 100, and preventing the first pole tab 201 and the second pole tab 202 from overlapping and short-circuiting, thereby extending the service life of the battery cell 100.

[0198] According to some embodiments of the present application, referring to FIG2 , the side of the cover plate 121 away from the first current collecting disc 3 is an arc-shaped side. As a result, the structure of the cover plate 121 is simple, easy to produce, and also improves the aesthetics of the cover plate 121. In addition, when the cover plate 121 is connected to the housing 11, the arc-shaped side of the cover plate 121 cooperates with the outer peripheral surface of the housing 11, which facilitates the assembly of the cover plate 121 and the housing 11, thereby improving the assembly efficiency of the battery cell 100. In addition, the connection area between the cover plate 121 and other components of the battery cell 100, such as the second current collecting disc 4, is increased, thereby improving the stability of the cover plate 121 in use.

[0199] Optionally, the cover plate 121 is a stamped steel part. This allows for high production efficiency and precision, thereby improving the connection between the cover plate 121, the pole 122, and the first current collecting tray 3. Furthermore, the flatness of the cover plate 121 is improved. Furthermore, steel's corrosion resistance facilitates the long-term use of the cover plate 121. Furthermore, steel's excellent electrical conductivity facilitates the electrical connection between the second current collecting tray 4 and the cover plate 121, facilitating the proper operation of the battery cell 100.

[0200] According to some optional embodiments of the present application, the first current collecting disc 3 and the pole 122 are both formed by stamping aluminum. Aluminum parts have a certain structural strength. As a result, the structural strength of the first current collecting disc 3 and the pole 122 is improved, which is conducive to the long-term and stable use of the first current collecting disc 3 and the pole 122. In addition, by stamping aluminum, the flatness of the first current collecting disc 3 and the pole 122 is improved, thereby improving the performance of the first current collecting disc 3 and the pole 122. Moreover, the lower surface of the pole 122 adopts a one-sided design, which facilitates welding of the pole 122 to the first current collecting disc 3. In addition, the aluminum part is conductive, which facilitates the passage of current through the first current collecting disc 3 and the pole 122. However, this is not limited to this.

[0201] Optionally, the base plate 123 is a stamped steel part. This allows for high production efficiency and precision, thereby improving the assembly accuracy of the base plate 123 and the cover plate 121. This also enhances the flatness of the base plate 123. Furthermore, the corrosion resistance and electrical conductivity of steel facilitate the long-term use of the base plate 123 and the electrical connection between the second collecting tray 4 and the base plate 123 via the cover plate 121.

[0202] According to some optional embodiments of the present application, referring to Figures 15 and 17 , the width of the groove 33 is w1, and the diameter of the electrode core 20 is d9, where w1 satisfies the following: 4 mm ≤ w1 ≤ 0.4 d9. In other words, the maximum width of the groove 33 is related to the diameter of the electrode core 20 and is 0.4 times the diameter of the electrode core 20. For example, when the width w1 of the groove 33 is greater than 0.4 d9, the width of the groove 33 is larger, thereby reducing the area of ​​other portions of the first current collecting disc 3, thereby reducing the contact area between the first current collecting disc 3 and the second insulating member 6, and reducing the connection stability between the first current collecting disc 3 and the second insulating member 6. When the width w1 of the groove 33 is less than 4 mm, the width of the groove 33 is smaller, thereby reducing the area of ​​the connecting protrusion 31, reducing the connection area between the first current collecting disc 3 and the first electrode tab 201, and thus reducing the connection stability between the first current collecting disc 3 and the first electrode tab 201, thereby improving the structural impedance of the battery cell 100. Therefore, by setting the width w1 of the groove 33 to satisfy 4mm≤w1≤0.4d9, the connection area between the first collecting disc 3 and the second insulating member 6 and the first pole tab 201 is increased, thereby increasing the connection stability between the first collecting disc 3 and the second insulating member 6 and the first pole tab 201, and reducing the structural impedance of the battery cell 100, which is beneficial to the use of the battery cell 100.

[0203] Optionally, both the first insulating member 5 and the second insulating member 6 can be made of polyethylene terephthalate (PET). PET has excellent electrical insulation properties, even under high-temperature and high-frequency conditions. Thus, even after the battery cell 100 has heated up after a period of use, the first insulating member 5 and the second insulating member 6 still provide good insulation, thereby preventing short circuits in the internal components of the battery cell 100 and facilitating normal use of the battery cell 100.

[0204] According to some optional embodiments of the present application, in conjunction with Figures 18 to 20, a liquid injection hole 1122 is provided on the bottom cover plate 112, and a sealing structure 1123 that cooperates with the liquid injection hole 1122 is provided at the liquid injection hole 1122. The sealing structure 1123 includes an elastic sealing gasket 1124 and a sealing cover 1125. The elastic sealing gasket 1124 is connected to the sealing cover 1125 on the side away from the pole core 20, and the sealing cover 1125 is welded to the elastic sealing gasket 1124 and the inner wall of the liquid injection hole 1122. As a result, the connection strength between the bottom cover plate 112 and the circumferential side wall of the shell body 111 is strengthened, thereby improving the structural strength of the shell 11, which is conducive to the long-term and stable use of the shell 11. In addition, the processing accuracy of the shell body 111 and the bottom cover plate 112 is improved, thereby improving the processing accuracy of the shell 11. Furthermore, after the electrolyte is injected into the battery cell 100 through the injection hole 1122, the elastic sealing gasket 1124 is used to seal the injection hole 1122, thereby preventing the electrolyte from flowing out and thus preventing damage to the battery cell 100. The sealing cover 1125 further improves the sealing between the elastic sealing gasket 1124 and the injection hole 1122, thereby further preventing the electrolyte from flowing out and thus further preventing damage to the battery cell 100.

[0205] According to some embodiments of the present application, referring to Figures 4 and 5, the pole 122 is opposite to the center of the above-mentioned one end of the pole core 20 (for example, the upper end of the pole core 20). For example, in the examples of Figures 4 and 5, the lower surface of the pole 122 is opposite to the center position of the upper end of the pole core 20. That is, the pole 122 is located at the center position of the upper end of the pole core 20. Such a setting is conducive to the connection of the pole 122 with the first current collecting disk 3, that is, the welding track of the first current collecting disk 3 after being connected to the pole 122 is as close to the center of the pole core 20 as possible, so as to reduce the structural impedance and improve the current carrying capacity, thereby improving the performance of the battery cell 300.

[0206] According to a second embodiment of the present application, a method for manufacturing the battery cell 100 of the first embodiment includes the following steps:

[0207] S1, connecting the first current collecting plate 3 of the battery cell 100 to the pole 122 of the cover plate assembly 12 of the battery cell 100;

[0208] S2. Connect the second current collecting plate 4 of the battery cell 100 to the second pole tab 202 of the pole core 20 of the battery cell 100, and connect the first current collecting plate 3 connected to the pole 122 to the first pole tab 201 of the pole core 20 to obtain a pole core assembly 2;

[0209] S3, placing the pole core assembly 2 into the shell 11 of the outer shell 1 of the battery cell 100; and

[0210] S4. Connect the base plate 123 of the cover plate assembly 12 to the cover plate 121 and the housing 11 respectively.

[0211] Thus, by connecting the first current collecting disc 3 to the pole 122, the first current collecting disc 3 and the cover plate assembly 12 are integrally connected, allowing the cover plate assembly 12 to be connected to other components of the battery cell 100, such as the first electrode tab 201, through the first current collecting disc 3. Compared with the conventional technique of sequentially assembling the components of the cover plate assembly 12, this reduces the difficulty of assembling the cover plate assembly 12 and other components, simplifies the assembly operation, and thus reduces the difficulty of assembling the battery cell 100 and improves the assembly efficiency of the battery cell 100. In addition, by connecting the second electrode tab 202 to the second current collecting disc 4, the second current collecting disc 4 can collect the current on the second electrode tab 202, so that the current carried by the second electrode tab 202 flows out through the second current collecting disc 4. By connecting the first current collecting plate 3 to the first electrode tab 201, the pole core 20, the first current collecting plate 3, the second current collecting plate 4, and the cover plate assembly 12 are integrated to form the pole core assembly 2. This simplifies assembly and facilitates the connection of the pole core assembly 2 with other components of the battery cell 100, as well as the smooth flow of current in the battery cell 100. Furthermore, by connecting the base plate 123 to the cover plate 121 and the housing 11, the base plate 123 is securely attached to the cover plate 121, while the battery cell 100 is integrated, completing the assembly of the battery cell 100. This reduces the manufacturing difficulty of the battery cell 100 and improves its manufacturing efficiency.

[0212] According to the manufacturing method of the battery cell 100 of the embodiment of the second aspect of the present application, the manufacturing difficulty of the battery cell 100 is relatively low, thereby improving the manufacturing efficiency of the battery cell 100. In addition, the difficulty of assembling the cover plate assembly 12 with other components is reduced, simplifying the assembly operation, thereby reducing the difficulty of assembling the battery cell 100 and improving the assembly efficiency of the battery cell 100. In addition, by connecting the first current collecting plate 3 to the first pole lug 201, the pole core 20, the first current collecting plate 3, the second current collecting plate 4, and the cover plate assembly 12 are connected as a whole to form the pole core assembly 2. The assembly operation is simple, which is also conducive to the connection of the pole core assembly 2 with other components of the battery cell 100 and the smooth flow of the current in the battery cell 100.

[0213] According to some embodiments of the present application, after the second current collecting tray 4 is connected to the second electrode tab 202, the first insulating member 5 of the battery cell 100 is connected to the second electrode tab 202 and the first electrode tab 201, respectively. For example, the first insulating member 5 is configured as insulating glue, with one side of the first insulating member 5 in the width direction connected to the first electrode tab 201, and the other side of the first insulating member 5 in the width direction connected to the second electrode tab 202. This achieves an insulated connection between the first electrode tab 201 and the second electrode tab 202, thereby preventing a short circuit between the first electrode tab 201 and the second electrode tab 202. Furthermore, by connecting the first insulating member 5 to the second electrode tab 202 and the first electrode tab 201, respectively, before the first current collecting tray 3 is connected to the first electrode tab 201, electrical connection between the electrode 122 and the second electrode tab 202 is effectively avoided, thereby ensuring electrical connection between the first current collecting tray 3 and the first electrode tab 201 and the electrode 122, and further ensuring normal use of the battery cell 100.

[0214] According to some embodiments of the present application, after the first current collecting tray 3 is connected to the first electrode tab 201, the second insulating member 6 of the battery cell 100 is covered on the side of the first current collecting tray 3 away from the first electrode tab 201. For example, the second insulating member 6 is configured as insulating glue and adhered to the upper side of the first current collecting tray 3 to provide an insulated connection between the first current collecting tray 3 and the substrate 123. This effectively prevents the current from the first current collecting tray 3 from flowing to the substrate 123, thereby ensuring that the currents of the positive and negative electrodes of the battery cell 100 flow independently of each other, thereby facilitating the use of the battery cell 100. Furthermore, the connection operation of the second insulating member 6 is simple, thereby reducing the difficulty of manufacturing the battery cell 100 and further facilitating the production and processing of the battery cell 100.

[0215] According to some embodiments of the present application, the first current collecting tray 3 is welded to the pole 122. This arrangement provides a secure connection between the first current collecting tray 3 and the pole 122, making it less likely for the first current collecting tray 3 to fall off the cover plate assembly 12. This strengthens the secure connection between the first current collecting tray 3 and the cover plate assembly 12, thereby enhancing the integrity of the battery cell 100 and extending the service life of the battery cell 100. Furthermore, the welding operation is simple, facilitating the production and processing of the battery cell 100.

[0216] According to some embodiments of the present application, the production of the cover plate assembly 12 includes the following steps:

[0217] The sealing member 127 of the cover plate assembly 12 is sleeved on the pole 122 .

[0218] One end of the pole 122 passes through the first insulating spacer 124, the cover plate 121, the second insulating spacer 125 and the connector 126 of the cover plate assembly 12 in sequence, and the above-mentioned one end of the pole 122 is connected to the connector 126, and the other end of the pole 122 is connected to the first collecting plate 3.

[0219] For example, the above-mentioned one end of the pole 122 refers to the upper end of the pole 122. By sequentially passing the upper end of the pole 122 through the first insulating partition 124, the cover plate 121, the second insulating partition 125, and the connector 126, and then connecting the pole 122 to the connector 126, the pole 122 is passed through the first insulating partition 124, the cover plate 121, the second insulating partition 125, and the connector 126, so that the first insulating partition 124, the cover plate 121, the second insulating partition 125, and the connector 126 are connected as a whole, thereby strengthening the integrity and sealing of the cover assembly 12, thereby facilitating the use of the cover assembly 12. In addition, the manufacturing steps of the cover assembly 12 are simple, thereby improving the manufacturing efficiency of the cover assembly 12. Moreover, by connecting the other end of the pole 122 to the first current collecting plate 3, the first current collecting plate 3 and the cover assembly 12 are connected as a whole, thereby facilitating the manufacturing of the battery cell 100.

[0220] According to some embodiments of the present application, referring to Figures 4, 5 and 10, the pole 122 includes a first pole segment 1221 and a second pole segment 1222 connected to each other, one end of the first pole segment 1221 passes through the first insulating partition 124, the cover plate 121, the second insulating partition 125 and the connector 126 in sequence and is connected to the connector 126, the other end of the first pole segment 1221 is connected to the second pole segment 1222, and the second pole segment 1222 is located between the first insulating partition 124 and the first current collecting disk 3.

[0221] For example, the first pole segment 1221 can be configured in a cylindrical shape, and the second pole segment 1222 can be configured in a plate shape. The lower end of the first pole segment 1221 is connected to the upper surface of the second pole segment 1222. The upper end of the first pole segment 1221 passes through the first insulating spacer 124, the cover plate 121, the second insulating spacer 125, and the connector 126 in sequence before being connected to the connector 126. The second pole segment 122 is located below the first insulating spacer 124 and is connected to the first current collecting plate 3. As a result, the structure of the pole 122 is simple, and the assembly operation between the pole 122 and the first insulating spacer 124, the cover plate 121, the second insulating spacer 125, and the connector 126 is simple, thereby simplifying the manufacturing steps of the cover plate assembly 12 and further facilitating the manufacture of the cover plate assembly 12. Furthermore, the difficulty of manufacturing the pole 122 is reduced, thereby further facilitating the manufacture of the cover plate assembly 12. In addition, the first insulating partition 124 has a limiting effect on the second pole segment 1222 to limit the upward movement of the second pole segment 1222, thereby making the connection between the pole 122 and the connecting member 126 more secure, and also improving the connection sealing between the pole 122 and the first insulating partition 124, the cover plate 121, the second insulating partition 125 and the connecting member 126.

[0222] According to some embodiments of the present application, the above-mentioned one end of the pole 122 is first riveted to the connector 126 and then laser welded. As a result, the pole 122 and the connector 126 can be quickly connected into a whole by riveting to obtain the cover assembly 12, and the positioning accuracy of the pole 122 and the connector 126 is also improved. Then, by welding the above-mentioned one end of the pole 122 to the connector 126, the connection strength between the pole 122 and the connector 126 is further strengthened, so that the pole 122 and the connector 126 are firmly connected together, preventing the pole 122 from falling off the connection, extending the service life of the pole 122, and further improving the stability and performance of the cover assembly 12 in long-term use, thereby extending the service life of the cover assembly 12.

[0223] According to some embodiments of the present application, the substrate 123 is first laser welded to the cover plate 121 and then laser welded to the shell 11. Thus, the substrate 123 can be quickly connected to the pole core assembly 2 as a whole by laser welding with the cover plate 121, and the connection operation of the substrate 123 and the cover plate 121 is simple. In addition, the connection between the substrate 123 and the cover plate 121 is conducive to the connection between the substrate 123 and the shell 11, so that the laser welding operation of the substrate 123 and the shell 11 is simpler. If the substrate 123 is first connected to the shell 11 and then to the cover plate 121, the difficulty of welding the substrate 123 and the cover plate 121 will increase, thereby reducing the production efficiency of the battery cell 100.

[0224] According to some embodiments of the present application, the first current collecting disc 3 is laser welded to the first pole tab 201. And / or, the second current collecting disc 4 is laser welded to the second pole tab 202. For example, the connection between the first current collecting disc 3 and the second current collecting disc 4 includes the following three situations: First, only the first current collecting disc 3 and the first pole tab 201 are laser welded, and the second current collecting disc 4 and the second pole tab 202 are connected in other ways. Second, only the second current collecting disc 4 and the second pole tab 202 are laser welded, and the first current collecting disc 3 and the first pole tab 201 are connected in other ways. Third, the first current collecting disc 3 is laser welded to the first pole tab 201, and the second current collecting disc 4 is laser welded to the second pole tab 202 at the same time. As a result, the connection between the first current collecting disc 3 and the first electrode tab 201 is more secure, and the connection between the second current collecting disc 4 and the second electrode tab 202 is more secure, preventing the second current collecting disc 4 from falling off the second electrode tab 202 and the first current collecting disc 3 from falling off the first electrode tab 201, thereby improving the connection stability between the first and second current collecting discs 3 and 4. Furthermore, compared with traditional torque welding, laser welding is used for connection, which unrestricts the current flowing through the first and second current collecting discs 3 and 4, and reduces welding costs, 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, which improves the feasibility of the welding process.

[0225] According to some embodiments of the present application, the method for manufacturing the battery cell 100 further includes the following steps: after the substrate 123 is connected to the housing 1, electrolyte is injected into the housing 1 through the injection hole 1122 of the housing 1, and the injection hole 1122 is sealed after the injection is completed. For example, in the examples of Figures 18 and 19, an injection hole 1122 is formed at the lower end of the housing 11, and the injection hole 1122 is connected to the accommodating cavity 13. Sealing the injection hole 1122 after the injection is completed can effectively prevent leakage of the electrolyte in the battery cell 100, thereby ensuring the normal use of the battery cell 100, and thus extending the service life of the battery cell 100.

[0226] Optionally, the separator 7 is first placed in the shell 11, and then the pole core assembly 2 is placed in the shell 11 of the outer shell 1 of the battery cell 100. For example, the separator 7 can be placed directly in the shell 11 so that the separator 7 contacts the bottom wall of the shell 11. There is no need to limit the direction between the separator 7 and the bottom wall of the shell 11. After the separator 7 is rotated along the axis in the up-down direction, it can still play a role in reducing the impedance of the battery cell 100 and still facilitate the gas generated in the battery cell 100 to be smoothly discharged from the pressure relief device 14, thereby greatly reducing the difficulty of manufacturing the battery cell 100, being more conducive to the manufacture of the battery cell 100, and further improving the manufacturing efficiency of the battery cell 100.

[0227] The battery 1000 according to the third embodiment of the present application includes the battery cell 100 according to the first embodiment, or the battery cell 100 manufactured according to the manufacturing method of the battery cell 100 of the second embodiment, as shown in FIG25 .

[0228] According to the battery 1000 of the embodiment of the present application, by using the above-mentioned battery cell 100, or the battery cell 100 manufactured by the above-mentioned manufacturing method of the battery cell 100, the structural impedance of the battery 1000 is reduced, which is more conducive to the use of the battery 1000 and improves the performance of the battery 1000. In addition, the manufacturing difficulty of the battery 1000 is reduced and the manufacturing efficiency of the battery 1000 is improved.

[0229] The battery module 2000 according to the fourth embodiment of the present application includes the battery 1000 according to the third embodiment mentioned above, as shown in FIG26 .

[0230] According to the battery module 2000 of the embodiment of the present application, by adopting the above-mentioned battery 1000, the performance of the battery module 2000 is improved, which is beneficial to the production and processing of the battery module 2000 and improves the production efficiency of the battery module 2000.

[0231] The battery pack 3000 according to the fifth embodiment of the present application includes the battery 1000 according to the third embodiment or the battery module 2000 according to the fourth embodiment, as shown in Figures 27 and 28.

[0232] According to the battery pack 3000 of the embodiment of the present application, by adopting the above-mentioned battery 1000 or battery module 2000, the performance of the battery pack 3000 is improved, the manufacturing difficulty of the battery pack 3000 is reduced, and the manufacturing efficiency of the battery pack 3000 is improved, which is conducive to the mass production of the battery pack 3000.

[0233] The electric device 4000 according to the sixth embodiment of the present application includes the battery pack 3000 according to the fifth embodiment described above, as shown in FIG29 .

[0234] According to the power consumption device 4000 of the present application, the performance of the power consumption device 4000 is improved 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.

[0235] Other structures and operations of the battery 1000 , the battery module 2000 , the battery pack 3000 and the 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.

[0236] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present application.

[0237] In the description of this application, “plurality” means two or more.

[0238] 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.

[0239] 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 purpose 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 housing (1), the housing (1) includes a housing body (11) and a cover plate assembly (12), the cover plate assembly (12) is provided on the housing body (11), a receiving cavity (13) is jointly defined between the cover plate assembly (12) and the housing body (11), the cover plate assembly (12) includes a cover plate (121) and a pole column (122), and the pole column (122) is insulated and connected to the cover plate (121); A pole core (20), the pole core (20) is provided in the receiving cavity (13), a first pole ear (201) and a second pole ear (202) are provided on the pole core (20), the polarities of the first pole ear (201) and the second pole ear (202) are opposite, and the first pole ear (201) and the second pole ear (202) are located at the same end of the pole core (20); A first current collector plate (3), the first current collector plate (3) is provided in the receiving cavity (13), the first current collector plate (3) is located between the first pole ear (201) and the cover plate assembly (12), and the pole column (122) is electrically connected to the first pole ear (201) through the first current collector plate (3); And A second current collector plate (4), the second current collector plate (4) is provided in the receiving cavity (13), the second current collector plate (4) is located between the second pole ear (202) and the cover plate assembly (12), the cover plate (121) is electrically connected to the second pole ear (202) through the second current collector plate (4), and the second current collector plate (4) is insulated from both the pole column (122) and the first current collector plate (3).

2. The battery cell (100) according to claim 1, characterized in that, The second current collector plate (4) is spaced from both the pole column (122) and the first current collector plate (3).

3. The battery cell (100) according to claim 1 or 2, characterized in that, Further comprising: A first insulating member (5), the first insulating member (5) is provided between the first pole ear (201) and the second pole ear (202), and the first pole ear (201) and the second pole ear (202) are insulated from each other through the first insulating member (5).

4. The battery cell (100) according to any one of claims 1-3, characterized in that, The first pole ear (201) and the second pole ear (202) are opposite to each other along the radial direction of the pole core (20).

5. The battery cell (100) according to any one of claims 1-4, characterized in that, The cover plate assembly (12) further includes: A substrate (123), the substrate (123) is connected to the housing body (11), an opening (1231) is formed on the substrate (123), the cover plate (121) is provided at the opening (1231), and the pole column (122) passes through the cover plate (121).

6. The battery cell (100) according to claim 5, characterized in that, The outer peripheral edge of the cover plate (121) has a stepped portion (1211), and the edge of the opening (1231) has a mating portion (1232) extending towards the center of the opening (1231), and the mating portion (1232) is fitted on the stepped portion (1211).

7. The battery cell (100) according to claim 5 or 6, characterized in that, On the side where the second current collector plate (4) is located, the minimum distance between the edge of the opening (1231) and the outer peripheral edge of the substrate (123) is d1, wherein the d1 satisfies: 1.5 mm ≤ d1 ≤ 4 mm.

8. The battery cell (100) according to any one of claims 5-7, characterized in that, Further comprising: A second insulating member (6), the second insulating member (6) is provided between the substrate (123) and the first current collecting plate (3), and the substrate (123) and the first current collecting plate (3) are insulated from each other through the second insulating member (6).

9. The battery cell (100) according to any one of claims 1-8, characterized in that, At least one of the second current collecting plate (4) and the first current collecting plate (3) is a single-layer structural member.

10. The battery cell (100) according to any one of claims 1-9, characterized in that, The second current collecting plate (4) includes: A first connecting portion (41), the second current collecting plate (4) is connected to the second tab (202) through the first connecting portion (41), and the first connecting portion (41) extends in a direction perpendicular to the central axis of the electrode core (20); A second connecting portion (42), the second connecting portion (42) is provided on a side of the first connecting portion (41) away from the second tab (202); and A third connecting portion (43), the third connecting portion (43) is connected to a side of the second connecting portion (42) away from the first connecting portion (41), the third connecting portion (43) extends in a direction perpendicular to the central axis of the electrode core (20), and the second connecting portion (42) is vertically connected between the third connecting portion (43) and the first connecting portion (41).

11. The battery cell (100) according to claim 10, characterized in that, The first connecting portion (41) includes two first sub-connecting portions (411) arranged at intervals, each first sub-connecting portion (411) includes a first side (4111) and a second side (4112), the first side (4111) and the second side (4112) are not on the same straight line, the first sides (4111) of the two first sub-connecting portions (411) are opposite to each other, and the second sides (4112) of the two first sub-connecting portions (411) are located on the same straight line; The second connecting portion (42) includes two second sub-connecting portions (421) arranged at intervals, one side of one of the second sub-connecting portions (421) is connected to the first side (4111) and the second side (4112) of one of the first sub-connecting portions (411), and one side of the other second sub-connecting portion (421) is connected to the first side (4111) and the second side (4112) of the other first sub-connecting portion (411); The third connecting portion (43) includes a third sub-connecting portion (431), and the third sub-connecting portion (431) is connected to the other sides of the two second sub-connecting portions (421) opposite to the first sides (4111) of the two first sub-connecting portions (411).

12. The battery cell (100) according to claim 11, characterized in that, The third sub-connecting portion (431) is connected between the other sides of the two second sub-connecting portions (421) opposite to the first sides (4111) of the two first sub-connecting portions (411).

13. The battery cell (100) according to claim 11 or 12, characterized in that, The third connecting portion (43) includes a fourth sub-connecting portion (432). One side of the fourth sub-connecting portion (432) is connected to the other sides of the two second sub-connecting portions (421) that are opposite to the second sides (4112) of the two first sub-connecting portions (411) and the third sub-connecting portion (431). The other side of the fourth sub-connecting portion (432) extends horizontally in a direction away from the first connecting portion (41).

14. The battery cell (100) according to any one of claims 11-13, characterized in that, The first side (4111) and the second side (4112) are perpendicular to each other.

15. The battery cell (100) according to any one of claims 11-14, characterized in that, The second current collecting plate (4) is symmetrically arranged with respect to the extending direction of the third sub-connecting portion (431).

16. The battery cell (100) according to any one of claims 1-15, characterized in that, The height of the second current collecting plate (4) is h3, and the distance between the surface of the cover plate (121) facing the first current collecting plate (3) and the surface of the first current collecting plate (3) away from the cover plate (121) is h4. Wherein, h3 and h4 satisfy: 0mm ≤ h3 - h4 ≤ 1mm.

17. The battery cell (100) according to any one of claims 1-16, characterized in that, A connecting protrusion (31) is provided on the surface of the first current collecting plate (3) adjacent to the first tab (201). The first current collecting plate (3) is connected to the first tab (201) through the connecting protrusion (31).

18. The battery cell (100) according to claim 17, wherein, The connecting protrusion (31) includes a first protrusion portion (311) and a second protrusion portion (312). One end of the first protrusion portion (311) is connected to one end of the second protrusion portion (312). The other ends of the first protrusion portion (311) and the second protrusion portion (312) extend in directions away from each other. The included angle between the first protrusion portion (311) and the second protrusion portion (312) is β. Wherein, β satisfies: 20° ≤ β ≤ 80°.

19. The battery cell (100) according to claim 18, characterized in that, A notch (32) is formed at the central edge of the first current collecting plate (3) away from the electrode core (20).

20. The battery cell (100) according to claim 19, characterized in that, The notch (32) is located between the other end of the first protrusion portion (311) and the other end of the second protrusion portion (312).

21. The battery cell (100) according to any one of claims 17-20, characterized in that, The connecting protrusion (31) is formed by a part of the surface of the first current collecting plate (3) away from the first tab (201) protruding towards the surface adjacent to the first tab (201). The connecting protrusion (31) forms a groove (33) on the surface of the first current collecting plate (3) away from the first tab (201) to form the connecting protrusion (31) on the surface adjacent to the first tab (201). The depth of the groove (33) is h5. Wherein, h5 satisfies: 0mm < h5 ≤ 2mm.

22. The battery cell (100) according to any one of claims 1-21, characterized in that, The first current collecting plate (3) and the cover plate assembly (12) are integrated into one body.

23. The battery cell (100) according to any one of claims 1-22, characterized in that, The first current collector plate (3) includes a main body portion (35) for connecting to the first tab (201). Along the thickness direction of the first current collector plate (3), the main body portion (35) is exposed outside the cover plate (121). The shortest distance between the center of the main body portion (35) and the center of the pole column (122) is d0, where d0 satisfies: 2 mm ≤ d0 ≤ 8 mm.

24. The battery cell (100) according to any one of claims 1-23, characterized in that, The pole column (122) penetrates through the cover plate (121). A first insulating separator (124) and a seal (127) are provided between the outer peripheral surface of the pole column (122) and the cover plate (121). The seal (127) is sleeved on the pole column (122), and the first insulating separator (124) is provided on the outer peripheral side of the seal (127) and the pole column (122).

25. The battery cell (100) according to claim 24, characterized in that, Further comprising: A connecting member (126) connected to an end of the pole column (122) away from the first current collector plate (3) along the thickness direction of the first current collector plate (3); and A second insulating separator (125) provided between the connecting member (126) and the cover plate (121).

26. The battery cell (100) according to claim 25, characterized in that, A second insulating separator groove (1251) is formed on the second insulating separator (125). The connecting member (126) is fitted in the second insulating separator groove (1251), and the connecting member (126) and the cover plate (121) are insulated from each other through the second insulating separator (125).

27. The cell (100) according to claim 25 or 26, characterized in that, The pole column (122) includes a first pole column section (1221) and a second pole column section (1222) connected to each other. The first pole column section (1221) passes through the cover plate (121) and the second insulating separator (125) and then is connected to the connecting member (126). The second pole column section (1222) is located on the side of the cover plate (121) facing the first current collector plate (3), and the second pole column section (1222) is connected to the first current collector plate (3).

28. The battery cell (100) according to claim 27, characterized in that, A rotation prevention protrusion (1241) is provided on a surface of the first insulating separator (124) adjacent to the first current collector plate (3). The rotation prevention protrusion (1241) and the surface of the first insulating separator (124) adjacent to the first current collector plate (3) jointly define a rotation prevention groove (1242). The side of the rotation prevention groove (1242) adjacent to the center of the first current collector plate (3) is open, and the second pole column section (1222) is fitted in the rotation prevention groove (1242); An extension portion (34) is provided on the first current collector plate (3). At least a part of the outer peripheral edge of the extension portion (34) is fitted in the rotation prevention groove (1242), and the extension portion (34) is located on the side of the second pole column section (1222) away from the cover plate (121).

29. The battery cell (100) according to claim 28, characterized in that, The at least a part of the outer peripheral edge of the extension portion (34) is adapted to the shape of the inner peripheral wall of the rotation prevention groove (1242).

30. The battery cell (100) according to any one of claims 27-29, characterized in that, A cover plate protrusion (1213) is provided on one side surface of the cover plate (121) adjacent to the first insulating partition (124). A first insulating partition groove (1243) is formed on one side surface of the first insulating partition (124) adjacent to the cover plate (121), and the cover plate protrusion (1213) is fitted in the first insulating partition groove (1243).

31. The battery cell (100) according to claim 30, characterized in that, A first insulating partition perforation (1244) is formed on the bottom wall of the first insulating partition groove (1243), and the first pole column section (1221) passes through the first insulating partition perforation (1244).

32. The battery cell (100) according to any one of claims 25-31, characterized in that, The width of the connecting member (126) is w, and the diameter of the pole column (122) is d7, wherein the w and d7 satisfy: 3.5 mm ≤ w - d7 ≤ 6 mm.

33. The battery cell (100) according to any one of claims 1-32, characterized in that, Further comprising: A partition member (7), the partition member (7) is provided in the housing (11), the partition member (7) is located between one end of the electrode core (20) away from the first tab (201) and the inner wall of the housing (11), and the electrode core (20) is isolated from the inner wall of the housing (11) by the partition member (7).

34. The battery cell (100) according to claim 33, characterized in that, At least one through hole (71) penetrating is formed on the partition member (7), a pressure relief device (14) is provided on the outer shell (1), the pressure relief device (14) is configured to be able to release the internal pressure of the battery cell (100), the pressure relief device (14) is located on one side of the outer shell (1) away from the partition member (7), and at least a part of the pressure relief device (14) is opposite to the through hole (71) along the thickness direction of the partition member (7).

35. The battery cell (100) according to claim 34, characterized in that, The area of the projection of at least a part of the pressure relief device (14) on the partition member (7) along the thickness direction of the partition member (7) overlapping with the through hole (71) is S1, and the cross-sectional area of the pressure relief device (14) cut along a plane perpendicular to the thickness direction of the partition member (7) is S2, wherein the S1 and S2 satisfy: 50% ≤ S1 / S2 ≤ 100%.

36. The battery cell (100) according to claim 34 or 35, characterized in that, The cross-sectional area of the through hole (71) cut along a plane perpendicular to the thickness direction of the partition member (7) is S3, and the cross-sectional area of the partition member (7) cut along a plane perpendicular to the thickness direction of the partition member (7) is S4, wherein the S3 and S4 satisfy: 30% ≤ S3 / S4 ≤ 80%.

37. A battery (1000), characterized in that, Comprising a battery cell (100) according to any one of claims 1-36.

38. A battery module (2000), characterized in that, Comprising a battery (1000) according to claim 37.

39. A battery pack (3000), characterized in that, Comprising a battery (1000) according to claim 37 or a battery module (2000) according to claim 38.

40. An electrical device (4000), characterized in that, Comprising a battery pack (3000) according to claim 39.

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