Cover plate, cover plate assembly, battery cell, battery, battery assembly and electrical device

Abstract

An electrical device, comprising a battery assembly, wherein the battery assembly comprises a battery, the battery comprising a battery cell; the battery cell comprises a cover plate assembly, wherein the cover plate assembly comprises a cover plate, the cover plate comprising a cover plate body, a terminal post, and a first current collecting plate. The terminal post is arranged on the cover plate body, and is insulated from and connected to the cover plate body; and the first current collecting plate is connected to the terminal post, and comprises a main body portion, wherein the main body portion is configured to be connected to a tab, and in the thickness direction of the first current collecting plate, the main body portion is exposed from the cover plate body, and the shortest distance between the main body portion and the center of the terminal post is d0, where d0 satisfies: 2 mm≤d0≤8 mm.

Description

Cover plate, cover plate assembly, battery cell, battery, battery assembly and electrical equipment

[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 202323669079.0 and titled “Cover, cover assembly, battery cell, battery, battery assembly and electrical equipment,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of electrical equipment, and in particular to a cover plate, a cover plate assembly, a battery cell, a battery, a battery assembly and an electrical equipment. Background Art

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

[0005] In related technologies, battery cells include cover plates, which have a large number of components and a low level of integration, reducing their performance. This also complicates assembly steps and reduces efficiency. Furthermore, the battery cells have low current carrying capacity and high impedance.

[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 cover plate with a high degree of integration. When the cover plate is used for a battery cell, it improves the current carrying capacity of the battery cell, reduces the impedance, and improves the installation efficiency of the battery cell.

[0008] The second objective of the present application is to provide a cover plate assembly using the above-mentioned cover plate.

[0009] The third object of the present application is to provide a battery cell using the above-mentioned cover plate assembly.

[0010] The fourth objective of this application is to provide a battery using the above-mentioned battery cell.

[0011] The fifth object of this application is to provide a battery assembly using the above-mentioned battery.

[0012] The sixth objective of the present application is to provide an electrical device using the above-mentioned battery assembly.

[0013] According to the cover plate of the embodiment of the first aspect of the present application, it includes: a cover plate body; a pole, the pole is arranged on the cover plate body, the first current collecting plate includes a main body, the main body is suitable for connecting to the pole ear, and the pole is insulated from the cover plate body; and a first current collecting plate, the first current collecting plate is connected to the pole, along the thickness direction of the first current collecting plate, the main body is exposed from the cover plate body, the shortest distance between the main body and the center of the pole is d0, wherein d0 satisfies: 2mm≤d0≤8mm.

[0014] According to the cover plate of the present application, by setting the shortest distance d0 between the main body and the center of the pole to meet 2mm≤d0≤8mm, it is beneficial to connect the first collector plate with the first lug and the pole, while also reducing impedance and improving current carrying capacity. In addition, the pole is insulated from the cover plate body, which can prevent current from the pole from flowing to the cover plate body and avoid short circuits, thereby facilitating the flow of current through the pole. In addition, it also facilitates the installation of the pole. When the cover plate is used in a battery cell, it is conducive to the long-term normal use of the battery cell.

[0015] According to the cover plate of the present application, the d0 further satisfies: 4mm≤d0≤8mm.

[0016] According to the cover plate of the present application, the pole is passed through the cover plate body, and a first insulating separator and a sealing member are provided between the outer peripheral surface of the pole and the cover plate body. The sealing member is sleeved on the pole, and the first insulating separator is provided on the outer peripheral side of the sealing member and the pole.

[0017] According to the cover plate of the present application, the cover plate further includes: a connector connected to an end of the pole away from the first collecting disk along the thickness direction of the first collecting disk; and a second insulating spacer, the second insulating spacer is arranged between the connector and the cover plate body.

[0018] According to the cover plate of the present application, a second insulating separator groove is formed on the second insulating separator, the connecting member is fitted in the second insulating separator groove, and the connecting member is insulated from the cover plate body by the second insulating separator.

[0019] According to the cover plate of the present application, the pole includes a first pole segment and a second pole segment connected to each other, the first pole segment passes through the cover plate body and the second insulating separator and is connected to the connecting member, the second pole segment is located on the side of the cover plate body facing the first current collecting disk, and the second pole segment is connected to the first current collecting disk.

[0020] According to some embodiments of the present application, a cover plate through-hole is formed on the cover plate body, the first pole segment passes through the cover plate through-hole, at least a portion of the seal is arranged between the outer peripheral surface of the first pole segment and the inner peripheral wall of the cover plate through-hole, and the first insulating partition is arranged on the outer peripheral side of the seal and the second pole segment.

[0021] According to some embodiments of the present application, the seal includes: a first sealing section, which is arranged between the outer peripheral surface of the pole and the inner peripheral wall of the cover plate perforation; and a second sealing section, which is connected to one end of the first sealing section adjacent to the first current collecting disk, and the second sealing section is located between the first insulating partition and the first pole section.

[0022] According to some embodiments of the present application, a stop groove is formed on the surface of one side of the first insulating separator adjacent to the first current collecting disk, and the second pole segment fits in the stop groove; an extension portion is provided on the first current collecting disk, at least a portion of the outer periphery of the extension portion fits in the stop groove, and the extension portion is located on a side of the second pole segment away from the cover plate body and is connected.

[0023] 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.

[0024] 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 the stop groove, and the side of the stop groove adjacent to the center of the first current collecting disk is open.

[0025] According to some embodiments of the present application, the thickness of the first insulating separator is d1, wherein d1 satisfies: 0.5 mm ≤ d1 ≤ 2.0 mm.

[0026] According to some embodiments of the present application, the first insulating separator is an injection-molded part.

[0027] According to some embodiments of the present application, a cover protrusion is provided on one side surface of the cover body adjacent to the first insulating separator along the thickness direction of the cover body; a first insulating separator groove is formed on the one side surface of the first insulating separator adjacent to the cover body along the thickness direction of the cover body, a first insulating separator through-hole is formed on the bottom wall of the first insulating separator groove, the first pole segment passes through the first insulating separator through-hole, and the cover protrusion fits in the first insulating separator groove.

[0028] According to some embodiments of the present application, the cover plate protrusion is formed by a portion of a side surface of the cover plate body away from the first current collecting plate along a thickness direction of the cover plate body protruding toward a side surface of the first current collecting plate.

[0029] According to some embodiments of the present application, the cover protrusion forms a cover groove on a surface of the cover body along a thickness direction of the cover body away from the first collecting plate, and at least a portion of the second insulating spacer fits in the cover groove.

[0030] According to some embodiments of the present application, the connecting member is polygonal or oblong.

[0031] According to some embodiments of the present application, the width of the connector is w, and the diameter of the pole is d2, wherein w and d2 satisfy: 3.5 mm ≤ w - d2 ≤ 6 mm.

[0032] According to some embodiments of the present application, the connecting member is an aluminum stamping part.

[0033] According to some embodiments of the present application, the cover plate body is a steel stamped part.

[0034] According to some embodiments of the present application, the first current collecting plate is provided with a connecting protrusion protruding away from the cover plate body along the thickness direction of the first current collecting plate.

[0035] 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 segment and the second protrusion segment is β, wherein β satisfies: 20°≤β≤80°.

[0036] According to some embodiments of the present application, the connecting protrusion is formed by a portion of a side surface of the first current collecting disk adjacent to the pole along the thickness direction of the first current collecting disk protruding toward a side surface away from the pole, and the connecting protrusion forms a groove on the side surface of the first current collecting disk adjacent to the pole along the thickness direction of the first current collecting disk to form the connecting protrusion on the side surface away from the pole.

[0037] According to the second aspect of the present application, the cover plate assembly includes: a cover plate, which is the cover plate according to the first aspect of the present application; and a second current collecting plate, which is connected to the cover plate body of the cover plate, and the second current collecting plate is insulated from the pole of the cover plate and the first current collecting plate, and the second current collecting plate and the first current collecting plate are respectively connected to the pole ears with opposite polarities.

[0038] According to some embodiments of the present application, the cover plate assembly further includes: a substrate connected to a side of the cover plate away from the second collecting plate along the thickness direction of the cover plate, an opening being formed on the substrate, and the pole is exposed from the opening.

[0039] 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.

[0040] 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 d4, wherein d4 satisfies: 1.5 mm ≤ d4 ≤ 4 mm.

[0041] According to some embodiments of the present application, the cover plate assembly further includes: a first insulating member, wherein the first insulating member is disposed between the base plate and the first current collecting plate.

[0042] According to some embodiments of the present application, the thickness of the first insulating member is h1, wherein h1 satisfies: 20um≤h1≤200um.

[0043] According to the third aspect embodiment of the present application, the battery cell includes: a pole core, one end of which is provided with a first pole ear and a second pole ear, and the polarity of the first pole ear and the second pole ear is opposite; and a cover plate assembly, the cover plate assembly is the cover plate assembly according to the above-mentioned second aspect embodiment of the present application, the cover plate assembly is provided at the one end of the pole core, the first current collecting disk of the cover plate assembly is connected to the first pole ear, and the second current collecting disk of the cover plate assembly is connected to the second pole ear.

[0044] According to some embodiments of the present application, the battery cell further includes: a second insulating member, wherein the second insulating member is disposed between the first electrode tab and the second electrode tab.

[0045] According to some embodiments of the present application, the thickness of the second insulating member is h2, wherein h2 satisfies: 20um≤h2≤200um.

[0046] According to some embodiments of the present application, the pole of the cover plate assembly is opposite to the center of the one end of the pole core.

[0047] The battery according to the fourth embodiment of the present application includes the battery cell according to the third embodiment of the present application.

[0048] According to some embodiments of the present application, the side edges of the cover plate body of the cover plate assembly of the battery cell are arc-shaped to adapt to the outer peripheral contour of the battery cell.

[0049] The battery assembly according to the fifth embodiment of the present application includes the battery according to the fourth embodiment of the present application.

[0050] The electrical equipment according to the sixth embodiment of the present application includes the battery assembly according to the fifth embodiment of the present application.

[0051] 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

[0052] 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:

[0053] FIG1 is a schematic diagram of a cover plate according to an embodiment of the present application;

[0054] FIG2 is an exploded view of a cover plate according to an embodiment of the present application;

[0055] FIG3 is a schematic diagram of a first insulating spacer of a cover plate according to an embodiment of the present application;

[0056] FIG4 is a schematic diagram of a first current collecting plate of a cover plate according to an embodiment of the present application;

[0057] FIG5 is a top view of a battery cell according to an embodiment of the present application, wherein the substrate is not shown;

[0058] FIG6 is a schematic diagram of a second current collecting plate of a cover plate assembly according to an embodiment of the present application.

[0059] FIG7 is a top view of a cover plate assembly according to an embodiment of the present application;

[0060] FIG8 is a schematic diagram of a battery cell according to an embodiment of the present application;

[0061] FIG9 is a cross-sectional view of an end portion of a battery cell according to an embodiment of the present application;

[0062] FIG10 is an enlarged view of the circled portion A in FIG9 ;

[0063] FIG11 is an exploded view of a battery cell according to an embodiment of the present application;

[0064] FIG12 is a top view of a battery cell according to an embodiment of the present application, wherein the cover plate is not shown;

[0065] FIG13 is a schematic diagram of a battery cell according to an embodiment of the present application from another angle;

[0066] FIG14 is an exploded view of a battery cell according to an embodiment of the present application from another angle;

[0067] FIG15 is a schematic diagram of a sealing structure of a battery cell according to an embodiment of the present application;

[0068] FIG16 is a schematic block diagram of a battery according to an embodiment of the present application;

[0069] FIG17 is a schematic block diagram of a battery assembly according to an embodiment of the present application;

[0070] FIG18 is a schematic block diagram of an electric device according to an embodiment of the present application.

[0071] Reference numerals:

[0072] Power-consuming equipment 3000, battery pack 2000, battery 1000,

[0073] Cover plate 100,

[0074] Cover plate body 1, cover plate through hole 11, cover plate protrusion 12, cover plate groove 13, step portion 14,

[0075] Pole 2, first pole segment 21, second pole segment 22,

[0076] The first collecting plate 3, the extension portion 31, the connecting protrusion 32, the first protrusion 321, the second protrusion 322, the groove 33, the notch 34, the main body 35,

[0077] First insulating separator 4, anti-rotation groove 41, anti-rotation protrusion 42, first insulating separator groove 43, first insulating separator through hole 44,

[0078] The second insulating spacer 5, the second insulating spacer groove 51,

[0079] Connector 6, seal 7, first sealing section 71, second sealing section 72,

[0080] Cover assembly 200, second current collecting plate 201, first connecting portion 2011, first sub-connecting portion 201a, first side 201b, second side 201c, second connecting portion 2012, second sub-connecting portion 201d, third connecting portion 2013, third sub-connecting portion 201e, fourth sub-connecting portion 201f, substrate 202, opening 2021, mating portion 2022, first insulating member 203,

[0081] Battery cell 300, electrode core 301, first electrode tab 3011, second electrode tab 3012, center hole 3013, second insulating member 302, shell 303, shell body 3030, bottom cover 3031, liquid injection hole 303a, sealing structure 3032, elastic sealing gasket 303b, sealing cover 303c, and separator 304. DETAILED DESCRIPTION

[0082] The following describes an embodiment of the present application in detail. The embodiments described with reference to the accompanying drawings are exemplary. The following describes a cover plate 100 according to an embodiment of the present application with reference to Figures 1 to 4. In the following description of the present application, the cover plate 100 is described by taking the battery cell 300 as an example.

[0083] As shown in FIG1 and FIG2 , the cover plate 100 according to the embodiment of the first aspect of the present application includes a cover plate body 1 , a pole 2 and a first collecting plate 3 .

[0084] Specifically, the pole 2 is provided on the cover body 1, and the pole 2 is insulated and connected to the cover body 1. For example, in the examples of Figures 1 and 2, the pole 2 is plugged into the cover body 1, the lower end face of the pole 2 is located below the cover body 1, and the upper end face of the pole 2 extends out after passing through the cover body 1. This arrangement facilitates the connection between the pole 2 and the cover body 1. In addition, the pole 2 is insulated and connected to the cover body 1, which can prevent the current on the pole 2 from flowing to the cover body 1, thereby facilitating the current passing through the pole 2. When the cover 100 is used for the battery cell 300, it is beneficial for the long-term normal use of the battery cell 300.

[0085] In conjunction with Figures 1, 2 and 3, the first current collecting disc 3 is connected to the pole 2. The first current collecting disc 3 includes a main body 35, which is suitable for connecting to the pole ear (for example, the first pole ear 3011). Along the thickness direction of the first current collecting disc 3 (for example, the up and down direction of Figure 2), the main body 35 is exposed to the cover body 1. The shortest distance between the main body 35 and the center of the pole 2 is d0, where d0 satisfies: 2mm≤d0≤8mm.

[0086] For example, in the examples of Figures 1, 2, and 3, a portion of the first current collecting disc 3 is located below the cover body 1 and connected to the pole 2, while the main body 35 (i.e., the other portion of the first current collecting disc 3) is exposed outside the cover body 1. After the first current collecting disc 3 and the pole 2 are welded together, the first current collecting disc 3 is then welded to the first tab 3011 of the pole core 301. To reduce impedance and ensure current-carrying capacity, welding is required to weld as many tabs 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 301, the better. Therefore, when the shortest distance d0 between the main body 35 and the center of the pole 2 is less than 2 mm, that is, the distance between the edge of the cover body 1 facing the first current collecting disc 3 and the central axis of the pole 2 is small, the vertical overlap area between the first current collecting disc 3 and the cover body 1 is small, which is not conducive to the connection between the first current collecting disc 3 and the pole 2. It also reduces the space for installing the pole 2, which is not conducive to the installation of the pole 2. When the shortest distance d0 between the main body 35 and the center of the electrode 2 is greater than 8mm, the weld path between the first current collecting disc 3 and the first tab 3011 is located further from the center of the electrode 2, increasing impedance and reducing current carrying capacity. Therefore, by ensuring that the shortest distance d0 between the main body 35 and the center of the electrode 2 satisfies the following: 2mm≤d0≤8mm, the distance between the main body 35 of the first current collecting disc 3 exposed from the cover body 1 and the center of the electrode 2 is appropriately set, facilitating the connection between the first current collecting disc 3, the first tab 3011, and the electrode 2, while also reducing impedance and improving current carrying capacity. Furthermore, the installation space for the electrode 2 is reasonable, facilitating the installation of the electrode 2. In related art, to ensure that the weld point between the current collecting disc and the tab is as close as possible to the center of the electrode core, the electrode and current collecting disc can only be welded in the center of the electrode core. However, welding from top to bottom can cause insulation failure and battery short circuit due to the presence of an insulating member in the middle. Typically, welding from bottom to top is the only option, and due to the high heat generated by laser welding, torque welding is the only option. However, torque welding is not conducive to improving the current carrying capacity of the battery cell and is costly. Therefore, the solution of the present application can avoid the use of torque welding between the pole 2 and the first collector plate 3, thereby improving the current carrying capacity of the battery cell 300 and facilitating the use of the battery cell 300.

[0087] According to the cover plate 100 of the present application, by setting the shortest distance d0 between the main body 35 and the center of the pole 2 to meet 2mm≤d0≤8mm, it is beneficial to connect the first current collecting plate 3 with the first pole lug 3011 and the pole 2, while also reducing impedance and improving current carrying capacity. In addition, the pole 2 is insulated from the cover plate body 1, which can prevent the current on the pole 2 from flowing to the cover plate body 1 and avoid short circuits, thereby facilitating the flow of current through the pole 2. In addition, it also facilitates the installation of the pole 2. When the cover plate 100 is used in the battery cell 300, it is beneficial for the long-term normal use of the battery cell 300.

[0088] According to some embodiments of the present application, referring to FIG3 , 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 2 is less than 4mm, i.e., the distance between the edge of the cover body 1 facing the first current collecting disc 3 and the central axis of the pole 2 is small, the vertical overlap area between the first current collecting disc 3 and the cover body 1 is small, which hinders the connection between the first current collecting disc 3 and the pole 2. Therefore, by ensuring that the shortest distance d0 between the main body 35 and the center of the pole 2 satisfies the following: 4mm≤d0≤8mm, the distance between the main body 35 of the first current collecting disc 3 exposed from the cover body 1 and the center of the pole 2 is more rationally set, facilitating the connection between the first current collecting disc 3, the first terminal tab 3011, and the pole 2, while also reducing impedance and improving current carrying capacity. For example, d0 can be set to 2mm, 4mm, or 8mm to facilitate the connection between the first current collecting disc 3 and the pole 2.

[0089] 1 and 2 , the first current collecting disc 3, the pole 2 and the cover body 1 are integrated into one. For example, in the examples of FIG1 and 2 , after the pole 2 is connected to the cover body 1, the lower end face of the pole 2 is connected to the upper side face of the first current collecting disc 3. With such a configuration, the integration allows the pole 2 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 3011. This improves the integration of the cover 100, facilitates the use of the cover 100, and thus improves the performance of the cover 100. When the cover 100 is used for the battery cell 300, it is convenient to assemble the cover 100 with other components of the battery cell 300, simplifies the assembly operation steps of the battery cell 300, reduces the difficulty of assembly, and improves the efficiency of assembly.

[0090] According to some embodiments of the present application, referring to Figures 2, 9 and 10, the pole 2 is passed through the cover body 1, and a first insulating separator 4 and a seal 7 are provided between the outer peripheral surface of the pole 2 and the cover body 1. The seal 7 is sleeved on the pole 2, and the first insulating separator 4 is provided on the outer peripheral side of the seal 7 and the pole 2.

[0091] For example, in the examples of Figures 2, 9, and 10, the upper end of the pole 2 passes through the cover body 1. The seal 7 is annular and fits over the outer circumference of the upper end of the pole 2. The lower end of the seal 7 contacts the lower end of the pole 2. The first insulating spacer 4 fits over the outer circumference of the lower end of the seal 7 and the outer circumference of the lower end of the pole 2. The upper end of the seal 7 is located between the cover body 1 and the pole 2, and the seal 7 provides insulation. With this arrangement, the cooperation between the first insulating member 203 and the seal 7 effectively ensures insulation between the cover body 1 and the pole 2, thereby effectively preventing current from flowing from the pole 2 to the cover body 1. This facilitates the passage of current from the pole 2. When the cover 100 is used in the battery cell 300, it facilitates the long-term normal use of the battery cell 300. In addition, the pole 2 and the cover body 1 compress the seal 7 and the first insulating member 203, thereby improving the sealing performance of the cover 100. In addition, the first insulating separator 4 and the seal 7 can separate the pole 2 and the cover body 1, thereby avoiding mutual friction between the pole 2 and the cover body 1, which is beneficial to the long-term use of the pole 2 and the cover body 1.

[0092] According to some embodiments of the present application, referring to Figures 2, 9 and 10, the cover plate 100 further includes a connector 6 and a second insulating separator 5, the connector 6 is connected to an end of the pole 2 away from the first collecting disc 3 along the thickness direction of the first collecting disc 3, and the second insulating separator 5 is arranged between the connector 6 and the cover plate body 1.

[0093] For example, in the examples of Figures 2, 9, and 10, the upper end of the pole 2 passes through the first insulating spacer 4, the cover body 1, the second insulating member 302, and the connector 6, and is then riveted and welded to the connector 6. The lower end of the second insulating spacer 5 is located between the outer peripheral surface of the first pole segment 21 and the cover body 1, and the lower end surface of the second insulating spacer 5 contacts the upper end surface of the seal 7. In this arrangement, the connector 6 can limit the upper end of the pole 2, thereby preventing the pole 2 from moving downward and separating from the cover body 1, thereby improving the connection stability between the pole 2 and the cover body 1. In addition, the connector 6 cooperates with the upper end of the pole 2. Through the cooperation between the pole 2 and the connector 6, the tightness of the overall connection between the pole 2, the first insulating spacer 4, the cover body 1, the seal 7, the second insulating spacer 5, and the connector 6 is strengthened, thereby improving the integrity of the cover 100 and further facilitating the use of the cover 100. Furthermore, the seal between the connector 6, the pole 2, and the cover body 1 is improved, thereby enhancing the sealability of the cover 100. Furthermore, when the cover 100 is used in the battery cell 300, the current from the first current collecting plate 3 can flow smoothly through the pole 2 and out, shortening the current flow path and reducing the structural impedance of the battery cell 300. Furthermore, the second insulating spacer 5 is used to separate the connector 6 from the cover body 1, preventing a short circuit in the battery cell 300 caused by an electrical connection between the connector 6 and the cover body 1.

[0094] Further, referring to Figure 2 , a second insulating spacer groove 51 is formed on the second insulating spacer 5, and the connector 6 fits within the second insulating spacer groove 51. The connector 6 is insulated from the cover body 1 by the second insulating spacer 5. For example, in the example of Figure 2 , the second insulating spacer groove 51 is formed on the upper side of the second insulating spacer 5, the lower side of the connector 6 abuts against the bottom wall of the second insulating spacer groove 51, and the upper end of the pole 2 passes through the second insulating spacer groove 51 and is connected to the connector 6.

[0095] With this arrangement, the second insulating separator groove 51 can position the connector 6, thereby facilitating the rapid assembly of the connector 6 and the second insulating separator 5, thereby improving the assembly efficiency and precision of the connector 6 and the second insulating separator 5. Furthermore, the second insulating separator groove 51 acts as a limiter for the connector 6, thereby preventing the connector 6 from rotating within the plane of the second insulating separator 5, thereby improving the connection stability between the connector 6 and the second insulating separator 5 and the assembly stability of the cover 100. Furthermore, the lower end of the second insulating separator 5 can insulate and separate the pole 2 and the cover body 1. When the cover 100 is used in the battery cell 300, it can effectively prevent the current on the pole 2 from flowing to the cover body 1, thereby preventing a short circuit between the pole 2 and the cover body 1, thereby facilitating the normal use of the cover body 1. Furthermore, when the cover 100 is used in the battery cell 300, the connector 6 increases the welding (e.g., laser welding) area between the first collector 3 and the tab of the battery cell 300.

[0096] According to some embodiments of the present application, with reference to Figures 2, 9, and 10, the pole 2 includes a first pole segment 21 and a second pole segment 22 connected to each other. The first pole segment 21 passes through the cover body 1 and the second insulating separator 5 and is connected to the connector 6. The second pole segment 22 is located on the side of the cover body 1 facing the first current collecting disc 3, and the second pole segment 22 is connected to the first current collecting disc 3. For example, in the examples of Figures 2, 9, and 10, the first pole segment 21 extends in the up-down direction. The upper end of the first pole segment 21 passes through the cover body 1 and the second insulating separator 5 and is connected to the connector 6. The lower end of the first pole segment 21 is connected to the upper side of the second pole segment 22. The second pole segment 22 is located on the lower side of the cover body 1, and the lower side of the second pole segment 22 is connected to the upper surface of the first current collecting disc 3. In this configuration, the second pole segment 22 limits the pole 2 from the lower side of the cover body 1 , restricting the pole 2 from moving upward, thereby improving the connection stability between the pole 2 and the cover body 1 , and further improving the overall stability of the cover 100 .

[0097] According to some embodiments of the present application, referring to Figures 2, 9 and 10, a cover plate through-hole 11 is formed on the cover plate body 1, the first pole segment 21 passes through the cover plate through-hole 11, at least a portion of the seal 7 is arranged between the outer peripheral surface of the first pole segment 21 and the inner peripheral wall of the cover plate through-hole 11, and the first insulating separator 4 is arranged on the outer peripheral side of the seal 7 and the second pole segment 22.

[0098] For example, in the examples of Figures 2, 9, and 10, the cover plate through-hole 11 extends through the cover plate body 1 along its thickness (i.e., the vertical direction in Figure 2). The upper end of the seal 7 (i.e., at least a portion of the seal 7) is located between the outer circumference of the first pole segment 21 and the inner circumferential wall of the cover plate through-hole 11. The first insulating spacer 4 is sleeved around the outer circumference of the lower end of the seal 7 and the outer circumference of the second pole segment 22. This arrangement facilitates the positioning of the pole 2, thereby facilitating the assembly of the pole 2 with the cover plate body 1 and improving the assembly efficiency of the cover plate 100. In addition, the cover body 1 is separated and insulated from the first pole segment 21 by at least a portion of the seal 7, and the cover body 1 is separated and insulated from the second pole segment 22 by the seal 7 and the first insulating separator 4, thereby effectively ensuring the separation and insulation of the cover body 1 and the pole 2. When the cover 100 is used in the battery cell 300, a short circuit between the pole 2 and the cover body 1 can be effectively avoided, which is beneficial to the normal use of the cover body 1. It should be noted that the seal 7 can be entirely located between the outer peripheral surface of the first pole segment 21 and the inner peripheral wall of the cover through-hole 11 to insulate the first pole segment 21 from the cover through-hole 11, and the upper portion of the first insulating separator 4 separates the upper surface of the second pole segment 22 from the lower surface of the cover body 1 to achieve an insulated connection between the second pole segment 22 and the cover body 1.

[0099] For example, in the examples of Figures 2, 9, and 10, the first insulating separator 4 and the second insulating separator 5 are respectively located on either side of the thickness direction of the cover body 1. The first pole segment 21 passes through the first insulating separator 4, the cover body 1, and the second insulating separator 5 in sequence. The second pole segment 22 is located between the first insulating separator 4 and the first current collecting plate 3. A portion of the lower side of the second insulating separator 5 is located between the outer peripheral surface of the first pole segment 21 and the inner wall of the cover through-hole 11. Thus, the first insulating separator 4 insulates and separates the second pole segment 22 from the cover body 1, and the second insulating separator 5 insulates and separates a portion of the first pole segment 21 from the cover body 1, thereby ensuring an insulated connection between the pole 2 and the cover body 1. When the cover 100 is used in the battery cell 300, it can effectively prevent the current on the pole 2 from flowing into the cover body 1, thereby preventing a short circuit between the pole 2 and the cover body 1, thereby facilitating the normal use of the pole 2 and the cover body 1. In addition, the first insulating separator 4 and the second insulating separator 5 can separate the pole 2 and the cover body 1, thereby avoiding friction between the pole 2 and the cover body 1, which is beneficial to the long-term use of the pole 2 and the cover body 1.

[0100] According to some embodiments of the present application, referring to Figures 2, 9, and 10, the seal 7 includes a first sealing segment 71 and a second sealing segment 72. The first sealing segment 71 is disposed between the outer circumferential surface of the pole 2 and the inner circumferential wall of the cover plate through-hole 11. The second sealing segment 72 is connected to the end of the first sealing segment 71 adjacent to the first current collecting disc 3. The second sealing segment 72 is located between the first insulating partition 4 and the first pole segment 21. For example, in the examples of Figures 2, 9, and 10, the first sealing segment 71 is located above the second sealing segment 72, and the outer circumferential surface of the seal 7 is stepped. The first sealing segment 71 is located between the outer circumferential surface of the first pole segment 21 and the inner wall of the cover plate through-hole 11 to insulate the first pole segment 21 from the inner wall of the cover plate through-hole 11. The upper surface of the first sealing segment 71 contacts the lower surface of the second insulating partition 5. The upper surface of the second sealing segment 72 abuts the lower surface of the edge of the cover plate through-hole 11, and the lower surface of the second sealing segment 72 contacts the upper surface of the second pole segment 22. This arrangement strengthens the tightness of the connection between the pole 2, the cover plate body 1, and the first insulating spacer 4, thereby further improving the sealing performance of the cover plate 100 and the insulation between the cover plate body 1 and the pole 2, thereby enhancing the performance of the cover plate 100. Furthermore, the seal 7 has a simple structure and is easy to produce, thereby improving the production efficiency of the seal 7.

[0101] 3, 4, and 9, a rotation-stop groove 41 is formed on a surface of the first insulating spacer 4 adjacent to the first current collecting plate 3, and the second pole segment 22 fits within the rotation-stop groove 41. An extension 31 is provided on the first current collecting plate 3, at least a portion of the outer periphery of the extension 31 fits within the rotation-stop groove 41, and the extension 31 is connected to the side of the second pole segment 22 that is away from the cover plate body 1.

[0102] For example, in the examples of Figures 3 and 9 , a stop groove 41 is formed on the lower surface of the first insulating partition 4, and one side of the second pole segment 22 is located in the stop groove 41. The outer peripheral surface of the aforementioned side of the second pole segment 22 has a shape that is substantially similar to the shape of the sidewall of the stop groove 41. After the aforementioned side of the second pole segment 22 is assembled in the stop groove 41, the outer peripheral surface of the second pole segment 22 is aligned with the sidewall of the stop groove 41. The side of the extension portion 31 facing the center of the first current collecting disk 3 is connected to one side of the main body portion 35. The extension portion 31 is located in the stop groove 41. The outer peripheral surface of the extension portion 31 has a shape that is substantially similar to the shape of the sidewall of the stop groove 41. After the extension portion 31 is assembled in the stop groove 41, the outer peripheral surface of the extension portion 31 is aligned with the sidewall of the stop groove 41, and the upper surface of the extension portion 31 is connected to the lower surface of the second pole segment 22. It should be noted that the above-mentioned "at least a part" means that only a part of the outer periphery of the extension part 31 is fitted in the anti-rotation groove 41, and the other part of the outer periphery of the extension part 31 is located outside the anti-rotation groove 41. Of course, it can also mean that the entire outer periphery of the extension part 34 is fitted in the anti-rotation groove 41. It can be set according to specific use to better meet actual applications.

[0103] With this arrangement, after the first insulating separator 4 is assembled with the pole 2 and the first current collecting disc 3, the anti-rotation groove 41 acts as a limiter for the second pole segment 22 and the extension 31, effectively preventing the pole 2 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 body 1, the first current collecting disc 3, and the pole 2. When the cover 100 is used in the battery cell 300, it also prevents the first current collecting disc 3 from rotating and contacting the second current collecting disc 201, thereby reducing the machining precision requirements for the pole core 301, the first pole tab 3011, and the second pole tab 3012, and improving the production efficiency of the pole core 301. Furthermore, when the first insulating separator 4 is assembled with the second pole segment 22 and the extension 31, the anti-rotation groove 41 facilitates the positioning of the second pole segment 22 and the extension 31, thereby facilitating faster assembly of the first insulating separator 4 with the pole 2 and the first current collecting disc 3, thereby improving the assembly efficiency of the cover 100. It should be noted that the anti-rotation groove 41 can be formed in the following ways: First, the anti-rotation groove 41 can be formed by the lower surface of the first insulating separator 4 being recessed in a direction away from the first current collecting plate 3. Second, other components disposed on the lower surface of the first insulating separator 4 can jointly define the anti-rotation groove 41 with the first insulating separator 4. However, this is not limited to these.

[0104] According to some embodiments of the present application, referring to Figures 3, 4, and 9, at least a portion of the outer periphery of the extension portion 31 is adapted to the shape of the inner peripheral wall of the anti-rotation groove 41. For example, in the examples of Figures 3, 4, and 9, the outer periphery of the extension portion 31 away from the center of the first current collecting tray 3 is generally arc-shaped, and the inner peripheral wall of the anti-rotation groove 41 is generally arc-shaped. The arc shape of the outer periphery of the extension portion 31 away from the center of the first current collecting tray 3 is generally similar to the arc shape of the inner peripheral wall of the anti-rotation groove 41, and the outer periphery of the extension portion 31 away from the center of the first current collecting tray 3 is aligned with the inner peripheral wall of the anti-rotation groove 41. This facilitates full contact between the outer periphery of the extension portion 31 away from the center of the first current collecting tray 3 and the inner peripheral wall of the anti-rotation groove 41, further improving the adaptability of the extension portion 31 and the anti-rotation groove 41, and strengthening the restraining effect of the anti-rotation groove 41 on the first current collecting tray 3, thereby further preventing the first current collecting tray 3 from rotating and improving the stability of the cover plate 100. It should be noted that the above-mentioned "at least a part" means that the shape of only a part of the outer periphery of the extension portion 31 is adapted to the shape of the inner wall of the anti-rotation groove 41, and the other part of the outer periphery of the extension portion 31 is not adapted to the shape of the inner wall of the anti-rotation groove 41. Of course, the shape of the entire outer periphery of the extension portion 31 can also be adapted to the shape of the inner wall of the anti-rotation groove 41, which can be set according to specific use to better meet actual applications.

[0105] According to some embodiments of the present application, referring to FIG3 and FIG9 , a first insulating spacer 4 is provided with a rotation-stopping protrusion 42 on a side surface adjacent to the first current collecting disc 3. The rotation-stopping protrusion 42 and the side surface of the first insulating spacer 4 adjacent to the first current collecting disc 3 jointly define a rotation-stopping groove 41. The side of the rotation-stopping groove 41 adjacent to the center of the first current collecting disc 3 is open. For example, in the examples of FIG3 and FIG9 , the rotation-stopping protrusion 42 can be configured in a "C" shape. The shape of the rotation-stopping protrusion 42 matches the shape of the end of the second pole segment 22 away from the first current collecting disc 3 and the shape of the side of the extension 31 away from the first current collecting disc 3. The side of the extension 31 away from the center of the first current collecting disc 3 is assembled with the rotation-stopping protrusion 42.

[0106] This arrangement facilitates insertion of the extension 31 of the first current collecting disc 3 into the anti-rotation groove 41 from the open side of the anti-rotation groove 41 in a direction perpendicular to the vertical direction, thereby facilitating assembly of the extension 31 with the anti-rotation protrusion 42, thereby improving assembly efficiency between the first insulating separator 4 and the first current collecting disc 3. Furthermore, this arrangement facilitates sufficient contact between the anti-rotation protrusion 42, the second pole segment 22, and the extension 31, thereby enhancing the connection stability between the first insulating separator 4, the pole 2, and the first current collecting disc 3. Furthermore, the simple structure of the anti-rotation protrusion 42 simplifies the structure of the first insulating separator 4 and further facilitates mass production of the first insulating separator 4. However, this is not limited to this. It should be noted that the anti-rotation protrusion 42 can also be composed of multiple cylinders or spheres (not shown), arranged in a "C" shape or other shape, or arranged continuously in a "C" shape, thereby ensuring that the anti-rotation protrusion 42 acts as a positional stop for the second pole segment 22. The anti-rotation protrusion 42 may also be configured in other shapes as long as it has the function of limiting the rotation of the second pole segment 22 .

[0107] Optionally, the pole post 2 and the first current collecting plate 3 in the cover plate 100 are connected by welding. This provides a more secure connection between the pole post 2 and the first current collecting plate 3, preventing the first current collecting plate 3 from falling off the pole post 2 and thereby improving the long-term stability of the first current collecting plate 3 and the pole post 2. Furthermore, the welding method is simple, thereby improving the feasibility of the welding process. However, this is not the only limitation.

[0108] According to some embodiments of the present application, referring to FIG9 , the thickness of the first insulating separator 4 is d1, wherein d1 satisfies: 0.5 mm ≤ d1 ≤ 2.0 mm. For example, the first insulating separator 4 is roughly a plate-like structure or a plate-like structure, and the thickness of the first insulating separator 4 refers to the thickness of the main body of the first insulating separator 4, and the main body of the first insulating separator 4 does not include the anti-rotation groove 41 and the anti-rotation protrusion 42 on the first insulating separator 4. When the thickness d1 of the first insulating separator 4 is greater than 2 mm, more material is used for the first insulating separator 4, thereby increasing the production cost of the first insulating separator 4, and further increasing the production cost of the cover 100, and increasing the space occupied by the first insulating separator 4, thereby increasing the overall volume of the cover 100, which is not conducive to the use of the cover 100. When the thickness d1 of the first insulating separator 4 is less than 0.5 mm, the thickness of the first insulating separator 4 is small, making the production of the first insulating separator 4 difficult, thereby making the production of the first insulating separator 4 difficult. This also reduces the wear resistance of the first insulating separator 4, causing the first insulating separator 4 to be easily damaged by friction, thereby shortening the service life of the first insulating separator 4. Therefore, by setting the thickness d1 of the first insulating separator 4 to meet the requirement of 0.5 mm ≤ d1 ≤ 2.0 mm, the production cost of the first insulating separator 4 is reduced, thereby reducing the production cost of the cover plate 100. Furthermore, the moderate thickness of the first insulating separator 4 facilitates the production of the first insulating separator 4. Furthermore, the wear resistance of the first insulating separator 4 is improved, thereby preventing damage to the first insulating separator 4 and extending the service life of the first insulating separator 4.

[0109] Optionally, the first insulating separator 4 is an injection-molded part. This improves the molding quality of the first insulating separator 4, as well as the production efficiency and processing accuracy of the first insulating separator 4. Furthermore, the integrity of the first insulating separator 4 is improved, thereby facilitating the long-term use of the first insulating separator 4.

[0110] According to some embodiments of the present application, referring to Figures 9 and 10 , a cover protrusion 12 is provided on one side of the cover body 1 adjacent to the first insulating spacer 4 along the thickness direction of the cover body 1 (i.e., the vertical direction), and a cover through-hole 11 extends through the cover protrusion 12. A first insulating spacer groove 43 is formed on one side of the first insulating spacer 4 adjacent to the cover body 1 along the thickness direction of the cover body 1, and a first insulating spacer through-hole 44 is formed on the bottom wall of the first insulating spacer groove 43. The first pole segment 21 extends through the first insulating spacer through-hole 44, and the cover protrusion 12 fits within the first insulating spacer groove 43.

[0111] For example, in the examples of Figures 9 and 10 , the first insulating spacer through-hole 44 extends through the first insulating spacer 4 along its thickness. The first insulating spacer through-hole 44 opposes the cover through-hole 11. The first pole segment 21 sequentially passes through the first insulating spacer through-hole 44 and the cover through-hole 11 to extend above the cover body 1. The lower surface of the cover protrusion 12 contacts the bottom wall of the first insulating spacer groove 43, and the outer circumference of the cover protrusion 12 contacts the inner wall of the first insulating spacer groove 43. The cover through-hole 11 extends through the cover protrusion 12. Thus, through the mating of the cover protrusion 12 and the first insulating spacer groove 43, the first insulating spacer groove 43 serves to position the cover protrusion 12, thereby facilitating rapid assembly of the cover body 1 and the first insulating spacer 4, thereby improving the assembly efficiency of the cover 100. In addition, the cover plate protrusion 12 has a simple structure, which is convenient for assembling the cover plate body 1 with other components. It also simplifies the structure of the cover plate body 1 and is convenient for the production and processing of the cover plate body 1 .

[0112] Optionally, referring to Figures 9 and 10, the cover plate protrusion 12 is formed by a portion of a side surface of the cover plate body 1 that protrudes toward a side surface of the first collecting plate 3 along the thickness direction of the cover plate body 1 away from the first collecting plate 3. For example, in the examples of Figures 9 and 10, the cover plate protrusion 12 is formed by a portion of the upper surface of the cover plate body 1 that protrudes downward. With this arrangement, the cover plate protrusion 12 has a simple structure and is easy to produce and process, thereby improving the production efficiency of the cover plate body 1. In addition, the integrity of the cover plate body 1 is improved, thereby increasing the structural strength of the cover plate protrusion 12 and improving the stability of the cover plate body 1 during long-term use.

[0113] According to some embodiments of the present application, referring to Figures 9 and 10 , the cover protrusion 12 forms a cover groove 13 on a side of the cover body 1 that is away from the first current collecting plate 3 along the thickness direction of the cover body 1. At least a portion of the second insulating spacer 5 fits within the cover groove 13. For example, in the examples of Figures 9 and 10 , the cover protrusion 12 is provided on the lower side of the cover body 1, and a cover groove 13 is formed at a corresponding position on the upper side of the cover body 1. The cover through-hole 11 extends through the bottom wall of the cover groove 13 and the cover protrusion 12. The lower end of the second insulating spacer 5 (i.e., at least a portion of the second insulating spacer 5) fits within the cover groove 13, and the outer peripheral surface of the lower end of the second insulating spacer 5 is in contact with the inner wall of the cover groove 13. With this arrangement, the cover groove 13 can position the second insulating spacer 5, facilitating assembly of the cover body 1 and the second insulating spacer 5, thereby improving the assembly efficiency of the cover 100. Furthermore, the cover plate groove 13 can limit the second insulating member 5, preventing the second insulating spacer 5 from rotating within the plane of the cover plate body 1, thereby improving the connection stability between the cover plate body 1 and the second insulating spacer 5, and further improving the operational stability of the cover plate 100. It should be noted that the second insulating spacer 5 can also be fully fitted within the cover plate groove 13 to effectively separate the cover plate body 1 and the connector 6. The fit between the second insulating spacer 5 and the cover plate groove 13 can be adjusted according to specific usage to better meet practical requirements.

[0114] Optionally, the connector 6 is polygonal or oblong. For example, when the connector 6 is polygonal, the contact area between the connector 6 and the second insulating separator 5 is larger, which increases the pressing area of ​​the connector 6 on the second insulating separator 5, thereby improving the tightness of the assembly of the connector 6 and the second insulating separator 5, and further improving the connection tightness of the various components of the cover 100. When the connector 6 is oblong, the contact area and welding surface between the connector 6 and the second insulating separator 5 are increased. In addition, the connector 6 has a simple structure and is easy to produce, thereby improving the production efficiency of the connector 6. In addition, the four corners of the connector 6 can be set to arc shape, which is convenient for installation and transportation and improves the aesthetics of the connector 6.

[0115] According to some embodiments of the present application, referring to FIG5 , the width of the connector 6 is w, and the diameter of the pole 2 is d2, wherein w and d2 satisfy the following relationship: 3.5 mm ≤ w - d2 ≤ 6 mm. For example, when the difference between the width w of the connector 6 and the diameter d2 of the pole 2 is greater than 6 mm, the connection area between the connector 6 and the pole 2 is small, and the width of the connector 6 is large, which reduces the connection stability between the connector 6 and the pole 2. When the difference between the width w of the connector 6 and the diameter d2 of the pole 2 is less than 3.5 mm, the distance between the edge of the connector 6 in the width direction and the edge of the upper end of the pole 2 is small, and the width of the connector 6 is also small, which reduces the structural strength of the connector 6 and is not conducive to the long-term use of the connector 6. Therefore, by setting the width w of the connector 6 and the diameter d2 of the pole 2 to satisfy 3.5 mm ≤ w - d2 ≤ 6 mm, the distance between the edge of the connector 6 in the width direction and the edge of the upper end of the pole 2 is moderate, which improves the structural strength of the connector 6 while also improving the connection stability between the connector 6 and the pole 2, which is conducive to the long-term and stable use of the connector 6 and the pole 2.

[0116] Optionally, the connector 6 is a stamped aluminum part. This allows for high production efficiency and precision, thus facilitating the long-term use of the connector 6. Furthermore, the aluminum stamping process improves the flatness of the connector 6. Furthermore, aluminum has excellent electrical conductivity, facilitating the flow of current through the connector 6.

[0117] Optionally, the seal 7 is injection molded from fluororubber. Fluororubber exhibits excellent corrosion and atmospheric aging resistance, thereby extending the service life of the seal 7. Furthermore, injection molding improves the molding quality and overall stability of the seal 7, as well as the production efficiency and processing accuracy of the seal 7, thereby further facilitating the long-term use of the seal 7.

[0118] Optionally, the cover body 1 is a stamped steel part. This allows for high production efficiency and precision, thereby improving the connection between the cover body 1, the pole 2, and the first collector plate 3. This also enhances the flatness of the cover body 1. Furthermore, the corrosion resistance of steel facilitates the long-term use of the cover body 1. Furthermore, steel's excellent electrical conductivity facilitates the electrical connection between the second collector plate 201 and the cover body 1, facilitating the proper operation of the battery cell 300.

[0119] According to some embodiments of the present application, referring to FIG2 and FIG4 , the first current collecting tray 3 is provided with a connecting protrusion 32 that protrudes away from the cover plate body 1 along the thickness direction of the first current collecting tray 3. For example, in the examples of FIG2 and FIG4 , the connecting protrusion 32 is formed by a portion of the first current collecting tray 3 that protrudes away from the cover plate body 1. With this arrangement, when the cover plate 100 is used in a battery cell 300, the first current collecting tray 3 is connected to the first electrode tab 3011 of the battery cell 300 via the connecting protrusion 32, facilitating an interference fit between the first current collecting tray 3 and the first electrode tab 3011. This improves the welding yield when the first current collecting tray 3 is welded to the first electrode tab 3011, thereby increasing the connection strength between the first current collecting tray 3 and the first electrode tab 3011. Furthermore, the simple structure of the connecting protrusion 32 simplifies the structure of the first current collecting tray 3 and facilitates mass production of the first current collecting tray 3.

[0120] 4 , the connecting protrusion 32 includes a first protrusion 321 and a second protrusion 322 , one end of the first protrusion 321 is connected to one end of the second protrusion 322 , and the other end of the first protrusion 321 and the other end of the second protrusion 322 extend away from each other.

[0121] For example, in the example of FIG4 , the connecting protrusion 32 can be configured in a "V" shape, with one end of the first protrusion 321 near the center of the first current collecting tray 3 connected to one end of the second protrusion 322 near the center of the first current collecting tray 3. The other ends of the first protrusion 321 and the other ends of the second protrusion 322 both extend away from the center of the first current collecting tray 3. The first protrusion 321 and the second protrusion 322 are symmetrical about the centerline of the first current collecting tray 3. This configuration provides a simple and well-designed connecting protrusion 32. After the first current collecting tray 3 is connected to the first tab 3011 of the battery cell 300, the stability of the overall connection between the first current collecting tray 3 and the first tab 3011 is improved, preventing the first current collecting tray 3 from shaking or rotating, thereby improving the operational stability of the battery cell 300. Furthermore, the connecting protrusion 32 is easy to manufacture, thereby reducing the difficulty of manufacturing the first current collecting tray 3 and improving the production efficiency of the first current collecting tray 3.

[0122] With reference to Figures 4 and 5 , the angle β between the first protrusion 321 and the second protrusion 322 satisfies the following: 20° ≤ β ≤ 80°. For example, when the angle β between the first protrusion 321 and the second protrusion 322 is greater than 80°, the distance between the other end of the first protrusion 321 and the other end of the second protrusion 322 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 3011 of the battery cell 300. When the angle β between the first protrusion 321 and the second protrusion 322 is less than 20°, the distance between the other end of the first protrusion 321 and the other end of the second protrusion 322 is smaller, and the distance between the opposing sides of the first protrusion 321 and the second protrusion 322 is smaller, reducing the uniformity of the distribution of the weld points on the first current collecting tray 3 and thus reducing the connection stability of the first current collecting tray 3. Therefore, by setting the angle β between the first protrusion 321 and the second protrusion 322 to satisfy 20°≤β≤80°, the position distribution of the first protrusion 321 and the second protrusion 322 is moderate, thereby improving the uniformity of the distribution of the welding points of the first collecting disc 3, and then improving the connection stability of the first collecting disc 3, which is beneficial to the long-term use of the first collecting disc 3.

[0123] Optionally, referring to Figures 4 and 5 , a notch 34 is formed on the edge of the first current collecting tray 3 facing away from the second current collecting tray 201. For example, in the examples shown in Figures 4 and 5 , the notch 34 is recessed toward the center of the first current collecting tray 3 and can be configured in a semicircular shape. Consequently, when the first current collecting tray 3 is welded to the first tab 3011 of the battery cell 300, during cooling, some areas of the welded first current collecting tray 3 may shrink more than others due to different thermal expansion coefficients, resulting in residual stress within the weld area. The notch 34 can alleviate this residual stress, thereby preventing thermal deformation and weld defects caused by welding the first current collecting tray 3 to the first tab 3011 of the battery cell 300, thereby improving the connection strength between the first current collecting tray 3 and the first tab 3011 of the battery cell 300. For example, the notch 34 is located between the other end of the first protrusion 321 and the other end of the second protrusion 322. Thus, the notch 34 is formed near the middle of the edge of the first current collecting tray 3 to better alleviate this residual stress. But it’s not limited to this.

[0124] According to some embodiments of the present application, referring to FIG2 and FIG4 , a connection protrusion 32 is formed by a portion of a side surface of the first current collecting disc 3 adjacent to the pole 2 along the thickness direction of the first current collecting disc 3, protruding toward a side surface away from the pole 2. The connection protrusion 32 forms a groove 33 on the side surface of the first current collecting disc 3 adjacent to the pole 2 along the thickness direction of the first current collecting disc 3, thereby forming the connection protrusion 32 on the side surface away from the pole 2. For example, in the examples of FIG2 and FIG4 , the groove 33 is formed by a portion of the upper surface of the first current collecting disc 3 being recessed downward to form the connection protrusion 32. The connection protrusion 32 forms a V-shaped groove 33 on the upper surface of the first current collecting disc 3. This configuration reduces the thickness of the area of ​​the first current collecting disc 3 where the connection protrusion 32 is located, thereby shortening the path of the current flowing through the connection protrusion 32, further facilitating the use of the first current collecting disc 3 and further reducing the structural impedance. In addition, the connecting protrusion 32 and the groove 33 have a simple structure and are relatively easy to process, thereby reducing the production cost of the first collecting plate 3 and improving the production efficiency of the first collecting plate 3 .

[0125] Optionally, referring to Figures 9 and 10 , the depth of the groove 33 is h3, where h3 satisfies the following conditions: 0 mm < h3 ≤ 2 mm. When the depth h3 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 32 and, in turn, the structural strength of the first current collecting tray 3. When the depth h3 of the groove 33 is 0 mm, the lower surface of the first current collecting tray 3 completely contacts and welds with the first tab 3011 of the battery cell 300. This results in a large weld area, high welding costs, and poor connection between the first current collecting tray 3 and other components of the battery cell 300. Therefore, by ensuring that the depth h3 of the groove 33 satisfies the condition 0 mm < h3 ≤ 2 mm, the structural strength of the connecting protrusion 32 and, in turn, the structural strength of the first current collecting tray 3 is improved. This also reduces welding costs for the first current collecting tray 3 and facilitates connection between the first current collecting tray 3 and other components of the battery cell 300.

[0126] Optionally, the first current collecting disc 3 and the pole 2 are both stamped out of aluminum. Aluminum has a certain structural strength. This improves the structural strength of the first current collecting disc 3 and the pole 2, which is beneficial to the long-term and stable use of the first current collecting disc 3 and the pole 2. In addition, the aluminum stamping improves the flatness of the first current collecting disc 3 and the pole 2, thereby improving the performance of the first current collecting disc 3 and the pole 2. Moreover, the lower surface of the pole 2 adopts a one-sided design, which facilitates the welding of the pole 2 to the first current collecting disc 3. In addition, the aluminum is conductive, which facilitates the current passing through the first current collecting disc 3 and the pole 2. However, this is not limited to this.

[0127] According to the cover plate assembly 200 of the embodiment of the second aspect of the present application, with reference to FIG5 , it includes a cover plate 100 and a second current collecting plate 201. The cover plate 100 is the cover plate 100 according to any embodiment of the first aspect of the present application, the second current collecting plate 201 is connected to the cover plate body 1 of the cover plate 100, the second current collecting plate 201 is insulated from the pole 2 and the first current collecting plate 3 of the cover plate 100, and the second current collecting plate 201 and the first current collecting plate 3 are respectively connected to pole tabs of opposite polarity, for example, the first current collecting plate 3 is connected to the first pole tab 3011, and the second current collecting plate 201 is connected to the second pole tab 3012.

[0128] For example, in the examples of Figures 5 and 11, the second current collecting tray 201 is located on the lower side of the cover body 1, with the upper side of the second current collecting tray 201 connected to the lower side of the cover body 1, and the second current collecting tray 201 and the first current collecting tray 3 facing each other. This arrangement facilitates the connection between the cover 100 and the second current collecting tray 201, thereby improving the assembly efficiency of the cover 100 and the second current collecting tray 201. In addition, it prevents short circuits between the second current collecting tray 201 and the poles 2 of the cover 100 and the first current collecting tray 3, thereby ensuring normal use of the second current collecting tray 201 and the cover 100. When the cover assembly 200 is used in a battery cell 300, the battery cell 300 has a first pole tab 3011 and a second pole tab 3012. The first pole tab 3011 is connected to the first current collecting tray 3, and the second pole tab 3012 is connected to the second current collecting tray 201. The first pole tab 3011 and the second pole tab 3012 have opposite polarity. The current-carrying flow path of the positive electrode of the battery cell 300 flows through the first pole ear 3011, the first current collecting disk 3 and the pole 2 in sequence and then is led out. The current-carrying flow path of the negative electrode of the battery cell 300 flows through the second pole ear 3012, the second current collecting disk 201 and the cover body 1 in sequence and then is led out. As a result, the current-carrying flow paths at the positive and negative electrodes of the battery cell 300 are both shorter, further reducing the structural impedance of the battery cell 300, which is more conducive to the use of the battery cell 300.

[0129] According to some optional embodiments of the present application, referring to FIG6 , the second current collecting plate 201 includes a first connecting portion 2011, a second connecting portion 2012, and a third connecting portion 2013, which are connected in sequence. The second current collecting plate 201 is connected to the cover plate 100 via the third connecting portion 2013, the second connecting portion 2012 is connected between the third connecting portion 2013 and the first connecting portion 2011, and the second current collecting plate 201 is connected to the second electrode tab 3012 via the first connecting portion 2011.

[0130] For example, in the example of FIG6 , the lower end of the second connecting portion 2012 is connected to the side of the upper surface of the first connecting portion 2011, the side of the third connecting portion 2013 is connected to the upper end of the second connecting portion 2012, and the upper surface of the third connecting portion 2013 is connected (e.g., welded) to the lower surface of the cover body 1. When the second current collecting tray 201 is used in the battery cell 300, the lower surface of the first connecting portion 2011 is connected to the upper surface of the second electrode tab 3012. Thus, the second connecting portion 2012 can support the first connecting portion 2011 and the third connecting portion 2013, thereby acting as a reinforcing rib, thereby improving the structural strength of the second current collecting tray 201, thereby facilitating the long-term and stable use of the second current collecting tray 201. Furthermore, the connection between the second current collecting tray 201 and the second electrode tab 3012 is more flat, making it less likely to collapse when subjected to stress. Furthermore, the third connecting portion 2013 is connected to the cover plate body 1, thereby firmly connecting the second current collecting plate 201 to the cover plate body 1, thereby improving the stability of the cover plate assembly 200. Furthermore, the first connecting portion 2011 is connected to the second electrode tab 3012, and the contact area between the first connecting portion 2011 and the second electrode tab 3012 is large, thereby facilitating and firmly connecting the first connecting portion 2011 and the second electrode tab 3012.

[0131] According to some embodiments of the present application, referring to FIG6 , the first connection portion 2011 and the third connection portion 2013 both extend perpendicular to the central axis of the cover plate 100, and the second connection portion 2012 is perpendicularly connected between the first connection portion 2011 and the third connection portion 2013. For example, in the example of FIG6 , the first connection portion 2011 and the third connection portion 2013 are parallel to the surface of the first current collecting tray 3, and the second connection portion 2012 is perpendicular to the first connection portion 2011 and the third connection portion 2013. This arrangement improves the flatness of the second current collecting tray 201, thereby facilitating connection of the second current collecting tray 201 to the cover plate body 1 via the third connection portion 2013, improving the welding yield between the second current collecting tray 201 and the cover plate body 1, effectively preventing the second current collecting tray 201 from falling off the cover plate 100, and thereby enhancing the operational stability of the second current collecting tray 201. In addition, the second current collecting tray 201 has a simple structure and is easy to produce and process, thereby improving the production efficiency of the second current collecting tray 201 and reducing the production cost of the second current collecting tray 201 .

[0132] According to some embodiments of the present application, referring to FIG6 , the first connection portion 2011 includes two first sub-connection portions 201a spaced apart from each other, each of the first sub-connection portions 201a including a first side 201b and a second side 201c perpendicular to each other. The first side 201b of the two first sub-connection portions 201a are opposite each other, and the second side 201c of the two first sub-connection portions 201a are located on the same straight line. For example, in the example of FIG6 , the two first sub-connection portions 201a are located on either side of the second connection portion 2012, and the first sub-connection portions 201a can be arranged in a fan shape, with the first side 201b and the second side 201c being the two straight edges of the fan shape. As a result, both first sub-connecting portions 201a can connect to the second electrode tab 3012 of the battery cell 300, thereby improving the overall stability of the connection between the second current collecting disc 201 and the second electrode tab 3012. The connection is secure, preventing the second current collecting disc 201 from falling off the second electrode tab 3012 and thereby improving the performance of the battery cell 300. Furthermore, by providing two first sub-connecting portions 201a, the contact area between the second current collecting disc 201 and the second electrode tab 3012 is increased, thereby improving the connection strength between the second current collecting disc 201 and the second electrode tab 3012 and reducing the structural impedance of the battery cell 300.

[0133] 6 , the second connection portion 2012 includes two spaced-apart second sub-connection portions 201d, one side of one of the second sub-connection portions 201d being connected to the first side 201b and the second side 201c of one of the first sub-connection portions 201a, and one side of the other second sub-connection portion 201d being connected to the first side 201b and the second side 201c of the other first sub-connection portion 201a. For example, in the example of FIG6 , the two second sub-connection portions 201d correspond one-to-one with the two first sub-connection portions 201a, and the two second sub-connection portions 201d are spaced-apart along the arrangement direction of the two first sub-connection portions 201a. The second sub-connection portions 201d can be vertically arranged and bend along the first side 201a and the second side 201b, with the bend forming an arc-shaped transition. This arrangement simplifies the structure of the second sub-connecting portion 201d, thereby simplifying the structure of the second current collecting tray 201, reducing the difficulty in producing the second current collecting tray 201, and improving the production efficiency of the second current collecting tray 201. Furthermore, the structural strength of the second sub-connecting portion 201d is enhanced, thereby further improving the supporting effect of the second connecting portion 2012 on the first connecting portion 2011 and the third connecting portion 2013, thereby further improving the structural strength of the second current collecting tray 201.

[0134] In conjunction with Figure 6, the third connection part 2013 includes a third sub-connection part 201e and a fourth sub-connection part 201f, the third sub-connection part 201e is connected between the other side of the two second sub-connection parts 201d opposite to the first side 201b of the two first sub-connection parts 201a, one side of the fourth sub-connection part 201f is connected to the other side of the two second sub-connection parts 201d opposite to the second side 201c of the two first sub-connection parts 201a and the third sub-connection part 201e, and the other side of the fourth sub-connection part 201f extends in a direction away from the first connection part 2011.

[0135] For example, in the example of FIG6 , the third connection portion 2013 is generally T-shaped, with the third sub-connection portion 201e being the vertical segment of the T and the fourth sub-connection portion 201f being the horizontal segment of the T. Both sides of the third sub-connection portion 201e in the width direction are connected to the sides of the two second sub-connection portions 201d away from the two first side edges 201b (i.e., the upper sides of the second sub-connection portions 201d opposite the first side edges 201b). The plane in which the fourth sub-connection portion 201f lies is parallel to the plane in which the first sub-connection portion 201a lies. The side of the fourth sub-connection portion 201f facing the first connection portion 2011 is connected to the sides of the two second sub-connection portions 201d away from the two second side edges 201c. Furthermore, the side of the fourth sub-connection portion 201f facing the first connection portion 2011 is connected to the side of the third sub-connection portion 201e facing the fourth sub-connection portion 210f.

[0136] With this arrangement, the two second sub-connecting portions 201d are connected together via the third sub-connecting portion 201e, thereby connecting the second current collecting disc 201 into a single unit and improving the structural strength of the second current collecting disc 201. Furthermore, the third sub-connecting portion 201e facilitates the connection of the second current collecting disc 201 to the cover plate body 1. Furthermore, the provision of the fourth sub-connecting portion 201f increases the area of ​​the third connecting portion 2013, improving the connection stability between the upper surface of the second current collecting disc 201 and the lower surface of the cover plate body 1 when the second current collecting disc 201 is connected to the cover plate 100. Furthermore, the structure of the second current collecting disc 201 is simple and easy to produce, thereby improving the production efficiency of the second current collecting disc 201. Furthermore, the fourth sub-connecting portion 201f acts as a reinforcing rib, enhancing the strength and flatness of the second current collecting disc 201 and improving the welding yield rate.

[0137] According to some embodiments of the present application, referring to Figures 7 and 11, the cover plate assembly 200 further includes a substrate 202. The substrate 202 is connected to a side of the cover plate 100 that is away from the second current collecting plate 201 along the thickness direction of the cover plate 100 (i.e., the vertical direction). An opening 2021 is formed on the substrate 202, and the pole 2 is exposed through the opening 2021. For example, in the examples of Figures 7 and 11, the substrate 202 is located above the cover plate body 1, and the edge of the opening 2021 mates with the outer peripheral edge of the cover plate body 1. In this arrangement, the substrate 202 can cover a portion of the cover plate 100, thereby improving the protective effect of the substrate 202 on the cover plate 100 and extending the service life of the cover plate 100. In addition, the appearance of the cover plate assembly 200 is relatively simple, improving the aesthetics of the cover plate assembly 200. In addition, it facilitates the welding of the first current collecting plate 3 and the first electrode tab 3011, thereby facilitating the assembly of the battery cell 300.

[0138] According to some embodiments of the present application, with reference to Figures 9 and 10, the outer periphery of the cover plate 100 has a step portion 14, and the edge of the opening 2021 has a mating portion 2022 extending toward the center of the opening 2021, and the mating portion 2022 is mated to the step portion 14. For example, in the examples of Figures 9 and 10, the edge of the cover plate body 1 forms a step portion 14, and the mating portion 2022 is also arranged in a step shape. Such a configuration facilitates the assembly and pressing of the cover plate body 1 and the substrate 202, improves the connection stability of the cover plate body 1 and the substrate 202, thereby improving the feasibility of the process, and further improving the assembly efficiency and assembly stability of the cover plate 100 and the substrate 202. In addition, the cover plate body 1 and the substrate 202 are not prone to relative movement, thereby improving the stability of the substrate 202 in long-term use.

[0139] According to some embodiments of the present application, referring to FIG. 7 , on the side where the second current collecting plate 201 is located, the minimum distance between the edge of the opening 2021 and the outer periphery of the substrate 202 is d4 , where d4 satisfies: 1.5 mm ≤ d4 ≤ 4 mm.

[0140] For example, when the minimum distance d4 between the edge of opening 2021 and the outer periphery of substrate 202 is greater than 4 mm, the cross-sectional area of ​​cover body 1 is reduced due to the fit between the edge of opening 2021 and the edge of cover body 1. This reduces the contact area between cover body 1 and second current collecting tray 201, thereby reducing the welding area between cover body 1 and second current collecting tray 201. When cover assembly 200 is used with battery cell 300, the structural impedance of battery cell 300 is improved. When the minimum distance d4 between the edge of opening 2021 and the outer periphery of substrate 202 is less than 1.5 mm, the spacing between the edge of opening 2021 and the outer periphery of substrate 202 on the side of second current collecting tray 201 is smaller, and the welding between substrate 202 and cover body 1 and the outer casing 303 of battery cell 300 can interfere with each other, thereby reducing the welding yield of cover assembly 200. Furthermore, the structural strength of substrate 202 is reduced, shortening its service life. Thus, by ensuring that the minimum distance d4 between the edge of opening 2021 and the outer periphery of substrate 202 satisfies 1.5 mm ≤ d4 ≤ 4 mm, the cross-sectional area of ​​cover plate body 1 is increased, thereby increasing the contact surface area between cover plate body 1 and second current collecting tray 201. This, in turn, reduces the structural impedance of battery cell 300 when cover plate assembly 200 is used in battery cell 300. Furthermore, the mutual influence between the welding of substrate 202 to cover plate body 1 and the welding of substrate 202 to the outer casing 303 of battery cell 300 is prevented, thereby improving the welding yield of cover plate assembly 200.

[0141] According to some embodiments of the present application, referring to FIG11 , the cover plate assembly 200 further includes a first insulating member 203, which is disposed between the substrate 202 and the first current collecting disc 3. For example, in the example of FIG11 , the first insulating member 203 wraps around the upper side and outer peripheral surface of the first current collecting disc 3. Thus, the first insulating member 203 insulates the substrate 202 from the first current collecting disc 3, thereby preventing a short circuit between the substrate 202 and the first current collecting disc 3 when the cover plate assembly 200 is used in the battery cell 300, and also ensures that the current carrying current of the first current collecting disc 3 flows out after passing through the pole 2, thereby enabling the cover plate assembly 200 to be used normally for a long time and reducing the structural impedance. For example, the first insulating member 203 can be configured as an insulating glue so that the first insulating member 203 has a bonding effect, thereby making the use and operation of the first insulating member 203 simple and low in cost.

[0142] According to some embodiments of the present application, referring to Figures 9 and 10 , the thickness of the first insulating member 203 is h1, where h1 satisfies the following: 20 μm ≤ h1 ≤ 200 μm. For example, when the thickness h1 of the first insulating member 203 is greater than 200 μm, the first insulating member 203 uses more material, resulting in a higher cost for the first insulating member 203 and, consequently, a higher cost for the cover plate 100. When the thickness h1 of the first insulating member 203 is less than 20 μm, the connection between the first insulating member 203 and the first current collecting plate 3 is weakened, thereby reducing the insulating effect of the first insulating member 203. Therefore, by ensuring that the thickness h1 of the first insulating member 203 satisfies the following: 20 μm ≤ h1 ≤ 200 μm, the material used for the first insulating member 203 is reduced, thereby reducing the production cost of the first insulating member 203 and, consequently, the production cost of the cover plate 100. Furthermore, the connection between the first insulating member 203 and the substrate 202 and the first current collecting plate 3 is strengthened, thereby facilitating the long-term use of the first insulating member 203 and facilitating the normal operation of the battery cell 300.

[0143] Optionally, at least one of the first current collecting tray 3 and the second current collecting tray 201 is a single-layer structure. The above-mentioned configurations of the first current collecting tray 3 and the second current collecting tray 201 include the following situations: first, only the first current collecting tray 3 is a single-layer structure; second, only the second current collecting tray 201 is a single-layer structure; third, both the first current collecting tray 3 and the second current collecting tray 201 are single-layer structures. Thus, when the cover plate assembly 200 is used in the battery cell 300, the current on the first electrode tab 3011 of the battery cell 300 can flow through the first current collecting tray 3 and out, and the current on the second electrode tab 3012 of the battery cell 300 can flow through the second current collecting tray 201 and out. Furthermore, the current can directly pass through the first current collecting tray 3 or the second current collecting tray 201 along the thickness direction of the first current collecting tray 3 or the second current collecting tray 201, thereby shortening the current flow path, reducing the structural impedance of the battery cell 300, facilitating the normal use of the battery cell 300, and improving the performance of the battery cell 300. Furthermore, the single-layer structure is simple and uses less material, thus reducing the production costs of the first and second collecting trays 3 and 201, and thus the production cost of the cover plate assembly 200. It should be noted that the term "single-layer structural member" refers to any portion of the structural member that is free of bends or overlaps along its thickness. Specifically, the first collecting tray 3 is a single-layered structure with no bends or overlaps, and the second collecting tray 201 is a single-layered structure with no bends or overlaps.

[0144] Optionally, the second collecting tray 201 is stamped from copper. Copper is corrosion-resistant and conductive. This facilitates the proper use of the second collecting tray 201 and improves its structural strength, facilitating its long-term, stable operation. Furthermore, stamping the second collecting tray 201 with copper improves its flatness, thereby enhancing its performance.

[0145] According to some optional embodiments of the present application, the cover plate body 1 of the cover plate assembly 200 is connected to the second current collecting plate 201 by welding. As a result, the connection between the cover plate body 1 and the second current collecting plate 201 is relatively firm, thereby preventing the second current collecting plate 201 from falling off the cover plate assembly 200, thereby improving the structural strength of the cover plate assembly 200.

[0146] Optionally, base plate 202 is a stamped steel part. This allows for high production efficiency and precision, thereby improving the assembly accuracy of base plate 202 and cover plate body 1. This also enhances the flatness of base plate 202. Furthermore, steel's corrosion resistance and electrical conductivity facilitate the long-term use of base plate 202 and the electrical connection between second collecting tray 201 and base plate 202 via cover plate body 1.

[0147] Referring to Figures 8 and 11 , the battery cell 300 according to the third embodiment of the present application includes a pole core 301 and a cover plate assembly 200. A first pole tab 3011 and a second pole tab 3012 are provided at one end of the pole core 301. The first pole tab 3011 and the second pole tab 3012 have opposite polarities. The cover plate assembly 200 is a cover plate assembly 200 according to any embodiment of the second aspect of the present application. The cover plate assembly 200 is provided at the aforementioned end of the pole core 301. The first current collecting plate 3 of the cover plate assembly 200 is connected to the first pole tab 3011, and the second current collecting plate 201 of the cover plate assembly 200 is connected to the second pole tab 3012.

[0148] For example, in the examples of Figures 8 and 11 , the first and second tabs 3011, 3012 are both located at the upper end of the core 301, and the cover plate assembly 200 is located above the first and second tabs 3011, 3012. The first and second tabs 3011, 3012 are spaced apart from each other. This arrangement allows the cover plate assembly 200 to be directly connected to the first and second tabs 3011, 3012, thereby improving the assembly efficiency of the battery cell 300. Furthermore, short circuits between the first and second tabs 3011 and 3012 are avoided, thereby facilitating the long-term normal use of the battery cell 300. Furthermore, by locating the first and second tabs 3011, 3012 on the same side of the core 301, an exhaust duct can be provided on only one side of the battery cell 300, thereby improving the space utilization of the battery cell 300.

[0149] For example, the first electrode tab 3011 is the positive electrode tab, and the second electrode tab 3012 is the negative electrode tab. The current flow path of the positive electrode of the battery cell 300 flows through the first electrode tab 3011, the first current collecting plate 3, and the electrode 2 in sequence before being drawn out. The current flow path of the negative electrode of the battery cell 300 flows through the second electrode tab 3012, the cover body 1, and the substrate 202 in sequence before being drawn out. As a result, the current flow paths at the positive and negative electrodes of the battery cell 300 are both shorter, further reducing the structural impedance of the battery cell 300 and making it more convenient to use the battery cell 300.

[0150] Optionally, the second current collecting disc 201 is connected to the second pole tab 3012 by welding, and the first current collecting disc 3 is connected to the first pole tab 3011 by welding. For example, the second current collecting disc 201 is laser welded to the second pole tab 3012, and the first current collecting disc 3 is laser welded to the first pole tab 3011. This provides a more secure connection between the second current collecting disc 201 and the second pole tab 3012, and a more secure connection between the first current collecting disc 3 and the first pole tab 3011, thereby preventing the second current collecting disc 201 from falling off the second pole tab 3012 and the first current collecting disc 3 from falling off the first pole tab 3011. This improves the connection stability between the first current collecting disc 3 and the second current collecting disc 201, and thus improves the stability of the cover plate assembly 200. Moreover, compared to conventional torque welding, laser welding for connection does not restrict the current flowing through the first collecting plate 3 and the second collecting plate 201, and the welding cost is low, thereby further reducing the production cost of the battery cell 300 and improving the welding yield and detectability of the battery cell 300. In addition, the welding method is simple, thereby improving the feasibility of the welding process.

[0151] According to some embodiments of the present application, referring to FIG11 , the battery cell 300 further includes a second insulating member 302, which is disposed between the first electrode tab 3011 and the second electrode tab 3012. For example, in the example of FIG11 , the widthwise sides of the lower side of the second insulating member 302 are connected to the first electrode tab 3011 and the second electrode tab 3012, respectively, and the upper side of the second insulating member 302 is connected to the lower side of the first current collecting plate 3. Thus, by providing the second insulating member 302, the first electrode tab 3011 and the second electrode tab 3012 can be insulated, thereby preventing a short circuit between the second electrode tab 3012 and the first electrode tab 3011, thereby facilitating the normal use of the battery cell 300. For example, the second insulating member 302 can be configured as an insulating adhesive so that the second insulating member 302 has a bonding effect, thereby making the second insulating member 302 easy to operate and having a low cost.

[0152] According to some embodiments of the present application, referring to FIG. 10 , the thickness of the second insulating member 302 is h2, where h2 satisfies the following: 20 μm ≤ h2 ≤ 200 μm. For example, when the thickness h2 of the second insulating member 302 is greater than 200 μm, the second insulating member 302 uses more material, resulting in a higher cost for the second insulating member 302 and, consequently, a higher production cost for the battery cell 300. When the thickness h2 of the second insulating member 302 is less than 20 μm, the connection between the second insulating member 302 and the first and second tabs 3011 and 3012 is weak, thereby reducing the operational stability of the second insulating member 302. Therefore, by ensuring that the thickness h2 of the second insulating member 302 satisfies the following: 20 μm ≤ h2 ≤ 200 μm, the material used for the second insulating member 302 is reduced, thereby reducing the production cost of the second insulating member 302 and, consequently, the production cost of the cover plate 100. Furthermore, the connection stability between the second insulating member 302 and the first and second tabs 3011 and 3012 is improved, thereby facilitating the long-term, stable operation of the second insulating member 302.

[0153] According to some embodiments of the present application, referring to FIG9 , the pole 2 of the cover plate assembly 200 is opposite to the center of the above-mentioned one end of the pole core 301. For example, in the example of FIG9 , the lower surface of the pole 2 is opposite to the center position of the upper end of the pole core 301. That is, the pole 2 is located at the center position of the upper end of the pole core 301. Such a setting is conducive to the connection between the pole 2 and the first current collecting disk 3, and also makes the welding track of the first current collecting disk 3 after connection as close as possible to the center of the pole core 301, so as to reduce the structural impedance and improve the current carrying capacity, thereby improving the performance of the battery cell 300.

[0154] Optionally, the annular connection between the substrate 202 and the cover body 1, as well as the annular connection between the substrate 202 and the shell 303, are generally designed to be similar to a "U" shape, that is, the connection between the substrate 202 and the cover body 1 is annular, and the connection between the substrate 202 and the shell 303, that is, the outer periphery of the connection between the above-mentioned substrate 202 and the cover body 1 is annular, thereby avoiding the overlap of welds at the welding points of the substrate 202 and the cover body 1 and the shell 303, resulting in poor welding, and avoiding the inflection point design, resulting in poor inflection point welding.

[0155] According to some optional embodiments of the present application, referring to Figures 5 and 11 , the width of the groove 33 is w1, and the diameter of the electrode core 301 is d5, where w1 satisfies the following relationship: 4 mm ≤ w1 ≤ 0.4 d5. In other words, the maximum width of the groove 33 is related to the diameter of the electrode core 301 and is 0.4 times the diameter of the electrode core 301. For example, when the width w1 of the groove 33 is greater than 0.4 d5, the width of the groove 33 is larger, thereby reducing the area of ​​the remaining portions of the first current collecting disc 3, thereby reducing the contact area between the first current collecting disc 3 and the first insulating member 203, and reducing the connection stability between the first current collecting disc 3 and the first insulating member 203. 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 32, reducing the connection area between the first current collecting disc 3 and the first electrode tab 3011, and thereby reducing the connection stability between the first current collecting disc 3 and the first electrode tab 3011, thereby improving the structural impedance of the battery cell 300. Therefore, by setting the width w1 of the groove 33 to satisfy 4mm≤w1≤0.4d5, the connection area between the first collecting disc 3 and the first insulating member 203 and the first pole tab 3011 is increased, thereby increasing the connection stability between the first collecting disc 3 and the first insulating member 203 and the first pole tab 3011, and reducing the structural impedance of the battery cell 300, which is beneficial to the use of the battery cell 300.

[0156] Optionally, the battery core 301 is formed by winding, with the first and second tabs 3011, 3012 being flattened or cut and stacked. The tabs are divided into two sides: one side is the first tab 3011, which is connected to the first current collector plate 3; the other side is the second tab 3012, which is connected to the second current collector plate 201. The first and second tabs 3011, 3012 are spaced apart. This facilitates the production of the battery core 301. Furthermore, it prevents short circuits between the first and second tabs 3011, 3012, thereby ensuring long-term, normal use of the battery cell 300.

[0157] Optionally, referring to FIG12 , a central hole 3013 is provided in the central region of the battery core 301. The central hole 3013 is located between the first and second tabs 3011, 3012. The opposing sides of the first and second tabs 3011, 3012 are tangential to the edges of the central hole 3013. The diameter of the central hole 3013 is d6, where d6 satisfies the following: 2 mm ≤ d6 ≤ 10 mm. When the diameter d6 of the central hole 3013 is greater than 10 mm, the area of ​​the first and second tabs 3011, 3012 is small, thereby reducing the contact area between the first and second tabs 3011, 3012 and the corresponding first and second current collecting trays 3, 201, and thus hindering the normal operation of the battery cell 300. When the diameter d6 of the central hole 3013 is less than 2 mm, the spacing between the first and second tabs 3011, 3012 is small, which can easily cause a short circuit and hinder the normal operation of the battery cell 300. Therefore, by setting the diameter of the center hole 3013 to d6 to satisfy 2mm≤d6≤10mm, the contact area between the first pole ear 3011 and the second pole ear 3012 and the corresponding first current collecting disk 3 and the second current collecting disk 201 can be increased, which is beneficial to the normal use of the battery cell 300, and the first pole ear 3011 and the second pole ear 3012 can be prevented from overlapping and short-circuiting, thereby extending the service life of the battery cell 300.

[0158] Optionally, referring to Figures 8 and 11, the battery cell 300 further includes a shell 303 and a separator 304. The shell 303 encloses the pole core 301. The pole core 301 and the separator 304 are both arranged in the shell 303. The separator 304 is located between the pole core 301 and the inner wall of the shell 303. The pole core 301 is isolated from the inner wall of the shell 303 by the separator 304. For example, in the examples of Figures 8 and 11, the separator 304 is provided at one end of the shell 303 away from the cover plate 100 in the vertical direction. The separator 304 is located between the lower end of the pole core 301 and the bottom wall of the shell 303. In this arrangement, the separator 304 separates the pole core 301 from the shell 303, so that the current on the pole core 301 cannot pass through the shell 303, thereby reducing the structural impedance of the battery cell 300. Furthermore, the end of the electrode core 301 adjacent to the separator 304 does not contact the bottom wall of the housing 303. The separator 304 protects the electrode core 301, preventing damage to the electrode core 301 from direct contact with the housing 303. This extends the service life of the electrode core 301 and, in turn, the service life of the battery cell 300. Furthermore, the separator 304 is easy to install; simply place it inside the housing 303, improving the efficiency of assembling the battery cell 300.

[0159] Optionally, referring to Figures 13-15, the housing 303 includes a body 3030 and a bottom cover 3031. The bottom cover 3031 is connected to the lower end of the body 3030 to define a space for accommodating the electrode core 301. The bottom cover 3031 and the body 3030 are welded together. A liquid injection hole 303a is provided on the bottom cover 3031. A sealing structure 3032 is provided at the liquid injection hole 303a to cooperate with the liquid injection hole 303a. The sealing structure 3032 includes an elastic sealing gasket 303b and a sealing cover 303c. The side of the elastic sealing gasket 303b facing away from the electrode core 301 is connected to the sealing cover 303c. The sealing cover 303c is welded to the elastic sealing gasket 303b and the inner wall of the liquid injection hole 303a. This strengthens the connection strength between the bottom cover 3031 and the circumferential sidewalls of the housing 303, thereby improving the structural strength of the housing 303 and facilitating the long-term and stable use of the housing 303. Furthermore, the machining accuracy of the body 3030 and bottom cover 3031 is improved, thereby improving the machining accuracy of the outer shell 303. Furthermore, after electrolyte is injected into the battery cell 300 through the injection hole 303a, the elastic sealing gasket 303b is used to seal the injection hole 303a, thereby preventing the electrolyte from leaking out and, in turn, protecting the battery cell 300 from damage. The sealing cover 303c further improves the sealing between the elastic sealing gasket 303b and the injection hole 303a, thereby further preventing the electrolyte from leaking out and, in turn, protecting the battery cell 300 from damage.

[0160] Optionally, both the first insulating member 203 and the second insulating member 302 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 300 has heated up after a period of use, the first insulating member 203 and the second insulating member 302 still provide good insulation, thereby preventing short circuits within the battery cell 300 and facilitating normal use of the battery cell 300.

[0161] The battery 1000 according to the fourth embodiment of the present application includes the battery cell 300 according to the third embodiment of the present application, as shown in FIG16 .

[0162] According to the battery 1000 of the embodiment of the present application, by adopting the above-mentioned battery cell 300, the assembly efficiency of the battery 1000 is improved and the performance of the battery 1000 is enhanced.

[0163] According to some embodiments of the present application, referring to FIG1 , the side edges of the cover plate body 1 of the cover plate 100 of the cover plate assembly 200 for a battery cell 300 are arc-shaped to conform to the outer contour of the battery cell 300. For example, in the example of FIG1 , the side edge of the cover plate body 1, away from the first current collecting tray 3 and along a plane perpendicular to the vertical direction of the first current collecting tray 3, is formed as an arc-shaped edge. The battery cell 300 is configured as a cylindrical shape, and the arc-shaped edge conforms to the edge shape of the battery cell 300. This simplifies the structure of the cover plate body 1, facilitating production and improving the aesthetics of the cover plate body 1. Furthermore, when the cover plate body 1 is used with the battery cell 300, the arc-shaped edge of the cover plate body 1 mates with the outer circumference of the battery cell 300, facilitating the assembly of the cover plate 100 with other components of the battery cell 300, thereby improving the assembly efficiency of the battery cell 300. Furthermore, the connection area between the cover plate body 1 and other components of the battery cell 300, such as the second current collecting tray 201, is increased, thereby enhancing the stability of the cover plate body 1 in use.

[0164] The battery assembly 2000 according to the fifth embodiment of the present application includes the battery 1000 according to the fourth embodiment of the present application, as shown in FIG17 .

[0165] According to the battery assembly 2000 of the embodiment of the present application, by adopting the above-mentioned battery 1000, the assembly efficiency of the battery assembly 2000 is improved, and the performance of the battery assembly 2000 is also improved.

[0166] The electric device 3000 according to the sixth embodiment of the present application includes the battery assembly 2000 according to the fifth embodiment of the present application, as shown in FIG18 .

[0167] According to the embodiment of the present application, the power-consuming device 3000 adopts the above-mentioned battery assembly 2000, thereby improving the performance of the power-consuming device 3000 and enhancing the user experience. The power-consuming device 3000 may be a vehicle, an electric two-wheeled vehicle, an electric multi-wheeled vehicle, an energy storage cabinet, a drone, a ship, etc.

[0168] Other structures and operations of the battery cell 300 , the battery 1000 , the battery assembly 2000 and the electric device 3000 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.

[0169] In the description of this application, it should be understood that the terms "center", "width", "thickness", "up", "down", "top", "bottom", "inside", "outside", "axial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0170] 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.

[0171] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cover plate (100), characterized in that, Comprising: Cover plate body (1); Terminal post (2), the terminal post (2) is provided on the cover plate body (1), and the terminal post (2) is insulated and connected to the cover plate body (1); and First current collector plate (3), the first current collector plate (3) is connected to the terminal post (2), the first current collector plate (3) includes a main body portion (35), the main body portion (35) is adapted to be connected to a tab, along the thickness direction of the first current collector plate (3), the main body portion (35) is exposed outside the cover plate body (1), and the shortest distance between the center of the main body portion (35) and the terminal post (2) is d0, wherein, the d0 satisfies: 2mm ≤ d0 ≤ 8mm.

2. The cover plate (100) according to claim 1, characterized in that, The d0 further satisfies: 4mm ≤ d0 ≤ 8mm.

3. The cover plate (100) according to claim 1 or 2, characterized in that, The terminal post (2) penetrates through the cover plate body (1), a first insulating separator (4) and a seal (7) are provided between the outer peripheral surface of the terminal post (2) and the cover plate body (1), the seal (7) is sleeved on the terminal post (2), and the first insulating separator (4) is provided on the outer peripheral side of the seal (7) and the terminal post (2).

4. The cover plate (100) according to claim 3, characterized in that, Further comprising: Connector (6), the connector (6) is connected to the end of the terminal post (2) away from the first current collector plate (3) along the thickness direction of the first current collector plate (3); and Second insulating separator (5), the second insulating separator (5) is provided between the connector (6) and the cover plate body (1).

5. The cover plate (100) according to claim 4, characterized in that, A second insulating separator groove (51) is formed on the second insulating separator (5), the connector (6) is fitted in the second insulating separator groove (51), and the connector (6) and the cover plate body (1) are insulated through the second insulating separator (5).

6. The cover plate (100) according to claim 4 or 5, characterized in that, The terminal post (2) includes a first terminal post segment (21) and a second terminal post segment (22) connected to each other, the first terminal post segment (21) passes through the cover plate body (1) and the second insulating separator (5) and is connected to the connector (6), the second terminal post segment (22) is located on the side of the cover plate body (1) facing the first current collector plate (3), and the second terminal post segment (22) is connected to the first current collector plate (3).

7. The cover plate (100) according to claim 6, characterized in that, A cover plate through hole (11) is formed on the cover plate body (1), the first terminal post segment (21) passes through the cover plate through hole (11), at least a part of the seal (7) is provided between the outer peripheral surface of the first terminal post segment (21) and the inner peripheral wall of the cover plate through hole (11), and the first insulating separator (4) is provided on the outer peripheral side of the seal (7) and the second terminal post segment (22).

8. The cover plate (100) according to claim 7, characterized in that, The seal (7) includes: First seal segment (71), the first seal segment (71) is provided between the outer peripheral surface of the terminal post (2) and the inner peripheral wall of the cover plate through hole (11); and Second seal segment (72), the second seal segment (72) is connected to one end of the first seal segment (71) adjacent to the first current collector plate (3), and the second seal segment (72) is located between the first insulating separator (4) and the first terminal post segment (21).

9. The cover plate (100) according to any one of claims 6-8, characterized in that, A rotation-preventing groove (41) is formed on one side surface of the first insulating partition member (4) adjacent to the first current collector plate (3), and the second pole column section (22) is fitted in the rotation-preventing groove (41); An extension part (31) is provided on the first current collector plate (3), and at least a part of the outer peripheral edge of the extension part (31) is fitted in the rotation-preventing groove (41), and the extension part (31) is connected to a side of the second pole column section (22) away from the cover plate body (1).

10. The cover plate (100) according to claim 9, characterized in that, The at least a part of the outer peripheral edge of the extension part (31) is adapted to the shape of the inner peripheral wall of the rotation-preventing groove (41).

11. The cover plate (100) according to claim 9 or 10, characterized in that, A rotation-preventing protrusion (42) is provided on one side surface of the first insulating partition member (4) adjacent to the first current collector plate (3), and the rotation-preventing protrusion (42) and the one side surface of the first insulating partition member (4) adjacent to the first current collector plate (3) jointly define the rotation-preventing groove (41), and one side of the rotation-preventing groove (41) adjacent to the center of the first current collector plate (3) is open.

12. The cover plate (100) according to any one of claims 3-11, characterized in that, The thickness of the first insulating partition member (4) is d1, wherein the d1 satisfies: 0.5 mm ≤ d1 ≤ 2.0 mm.

13. The cover plate (100) according to any one of claims 3-12, characterized in that, The first insulating partition member (4) is an injection molded part.

14. The cover plate (100) according to any one of claims 6-11, characterized in that, A cover plate protrusion (12) is provided on one side surface of the cover plate body (1) adjacent to the first insulating partition member (4) along the thickness direction of the cover plate body (1); A first insulating partition member groove (43) is formed on one side surface of the first insulating partition member (4) adjacent to the cover plate body (1) along the thickness direction of the cover plate body (1), and a first insulating partition member through hole (44) is formed on the bottom wall of the first insulating partition member groove (43), the first pole column section (21) passes through the first insulating partition member through hole (44), and the cover plate protrusion (12) is fitted in the first insulating partition member groove (43).

15. The cover plate (100) according to claim 14, characterized in that, The cover plate protrusion (12) is formed by a part of one side surface of the cover plate body (1) away from the first current collector plate (3) along the thickness direction of the cover plate body (1) protruding towards the first current collector plate (3).

16. The cover plate (100) according to claim 14 or 15, characterized in that, The cover plate protrusion (12) forms a cover plate groove (13) on one side surface of the cover plate body (1) away from the first current collector plate (3) along the thickness direction of the cover plate body (1), and at least a part of the second insulating partition member (5) is fitted in the cover plate groove (13).

17. The cover plate (100) according to any one of claims 4-11 and 14-16, characterized in that, The connecting member (6) is polygonal or oblong.

18. The cover plate (100) according to any one of claims 4-11 and 14-17, characterized in that, The width of the connecting member (6) is w, and the diameter of the pole column (2) is d2, wherein the w and d2 satisfy: 3.5 mm ≤ w - d2 ≤ 6 mm.

19. The cover plate (100) according to any one of claims 4-11 and 14-18, characterized in that, The connecting member (6) is an aluminum stamping part.

20. The cover plate (100) according to any one of claims 1-19, characterized in that, The cover plate body (1) is a steel stamping part.

21. The cover plate (100) according to any one of claims 1-20, characterized in that, A connecting protrusion (32) protruding away from the cover plate body (1) along the thickness direction of the first current collector plate (3) is provided on the first current collector plate (3).

22. The cover plate (100) according to claim 21, characterized in that, The connecting protrusion (32) includes a first protrusion portion (321) and a second protrusion portion (322). One end of the first protrusion portion (321) is connected to one end of the second protrusion portion (322). The other end of the first protrusion portion (321) and the other end of the second protrusion portion (322) extend in directions away from each other. The included angle between the first protrusion segment and the second protrusion segment is β, where β satisfies: 20° ≤ β ≤ 80°.

23. The cover plate (100) according to claim 21 or 22, characterized in that, The connecting protrusion (32) is formed by a part of a side surface of the first current collector plate (3) adjacent to the pole column (2) along the thickness direction of the first current collector plate (3) protruding towards the side surface away from the pole column (2). The connecting protrusion (32) forms a groove (33) on a side surface of the first current collector plate (3) adjacent to the pole column (2) along the thickness direction of the first current collector plate (3) to form the connecting protrusion (32) on the side surface away from the pole column (2).

24. A cover plate assembly (200), characterized in that, Including: A cover plate (100), where the cover plate (100) is the cover plate (100) according to any one of claims 1 - 23; And A second current collector plate (201), which is connected to the cover plate body (1) of the cover plate (100). The second current collector plate (201) is insulated from the pole column (2) and the first current collector plate (3) of the cover plate (100). The second current collector plate (201) and the first current collector plate (3) are respectively connected to pole tabs with opposite polarities.

25. The cover plate assembly (200) according to claim 24, wherein Further including: A substrate (202), which is connected to a side of the cover plate (100) away from the second current collector plate (201) along the thickness direction of the cover plate (100). An opening (2021) is formed on the substrate (202), and the pole column (2) is exposed from the opening (2021).

26. The cover plate assembly (200) according to claim 25, wherein, The outer peripheral edge of the cover plate (100) has a step portion (14). The edge of the opening (2021) has a mating portion (2022) extending towards the center of the opening (2021), and the mating portion (2022) is mated on the step portion (14).

27. The cover plate assembly (200) according to claim 25 or 26, characterized in that, On the side where the second current collector plate (201) is located, the minimum distance between the edge of the opening (2021) and the outer peripheral edge of the substrate (202) is d4, where d4 satisfies: 1.5 mm ≤ d4 ≤ 4 mm.

28. The cover plate assembly (200) according to any one of claims 25-27, characterized in that, Further including: A first insulating member (203), which is arranged between the substrate (202) and the first current collector plate (3).

29. The cover plate assembly (200) according to claim 28, wherein, The thickness of the first insulating member (203) is h1, where h1 satisfies: 20 μm ≤ h1 ≤ 200 μm.

30. A battery cell (300), characterized in that, Including: A pole core (301), where one end of the pole core (301) is provided with a first pole tab (3011) and a second pole tab (3012), and the polarities of the first pole tab (3011) and the second pole tab (3012) are opposite; and Cover plate assembly (200), the cover plate assembly (200) being the cover plate assembly (200) according to any one of claims 24-29, the cover plate assembly (200) being provided at one end of the electrode core (301), the first current collector plate (3) of the cover plate assembly (200) being connected to the first tab (3011), and the second current collector plate (201) of the cover plate assembly (200) being connected to the second tab (3012).

31. The battery cell (300) according to claim 30, characterized in that, Further comprising: A second insulating member (302), the second insulating member (302) being provided between the first tab (3011) and the second tab (3012).

32. The battery cell (300) according to claim 31, characterized in that, The thickness of the second insulating member (302) is h2, wherein h2 satisfies: 20um ≤ h2 ≤ 200um.

33. The battery cell (300) according to any one of claims 30-32, characterized in that, The terminal post (2) of the cover plate assembly (200) is opposite to the center of one end of the electrode core (301).

34. A battery (1000), characterized in that, Comprising an electrode cell (300) according to any one of claims 30-33.

35. The battery (1000) according to claim 34, characterized in that, The side of the cover plate body (1) of the cover plate (100) of the cover plate assembly (200) of the electrode cell (300) is an arc adapted to the outer peripheral contour of the electrode cell (300).

36. A battery assembly (2000), characterized in that, Comprising a battery (1000) according to claim 34 or 35.

37. An electrical device (3000), characterized in that, Comprising a battery assembly (2000) according to claim 36.

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