Current collector, top cover assembly, battery, and electric device

Abstract

The present application provides a current collector, a top cover assembly, a battery, and an electric device. The current collector comprises a current collector body and a reinforcing part; the current collector body is configured to be electrically connected to a pole and a tab; and the reinforcing part is arranged on the current collector body. A reinforcing part can well reinforce a current collector, so as to improve the overall strength of the current collector, thereby improving the reliability of a battery and prolonging the service life of the battery.

Description

Current collector, top cover assembly, battery and electric device

[0001] The present application claims priority to the Chinese patent application No. 202420783175.3, 202420783219.2, 202420783316.1, 202410454786.8, filed on April 15, 2024 with the China Patent Office, the whole content of the above application is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a current collector, a top cover assembly, a battery and an electric device. BACKGROUND

[0003] The battery is a device for converting chemical energy into electrical energy, which usually includes a core package, a pole and a current collector. The tab of the core package is electrically connected to the pole through the current collector, so that the battery can supply power to the external electric device through the pole. SUMMARY

[0004] In the related art, the strength of the current collector is low, so it is easy to deform or even break during use, which causes the battery to malfunction.

[0005] Embodiments of the present application provide a current collector, which includes a current collector body and a reinforcing part. The current collector body is used to electrically connect with a pole and a tab. The reinforcing part is arranged on the current collector body.

[0006] The present application also provides a top cover assembly of a battery, which includes a cover body, a current collector as described above and a pole. The current collector is mounted on the cover body. The pole is mounted on the cover body and electrically connected with the pole segment.

[0007] The present application also provides a battery, which includes a shell, a core package and a top cover assembly as described above. The shell is provided with a mounting cavity. The core package is arranged in the mounting cavity and is provided with the tab. The cover body is stacked on the shell to close the mounting cavity. The tab segment is electrically connected with the tab.

[0008] The present application also provides an electric device, which includes a battery as described above. ADVANTAGEOUS EFFECTS

[0009] The current collector, the top cover assembly, the battery and the electric device provided by the present application can improve the technical problem that the current collector body is easy to deform or even break due to its low strength by arranging the reinforcing part on the current collector body, so as to improve the reliability and service life of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 is a structural schematic diagram of the structure of the current collector and the tab and the pole in an embodiment of the present application.

[0011] Fig. 2 is a structural schematic diagram of the current collector shown in Fig. 1.

[0012] Fig. 3 is a schematic diagram of the current collector shown in Fig. 1 forming a multi-segment arc-shaped welding track.

[0013] Fig. 4 is a schematic diagram of the current collector shown in Fig. 1 forming a circular ring-shaped welding track.

[0014] Fig. 5 is a schematic diagram of the tab connecting structure of the current collector shown in Fig. 1 being folded to the main body of the tab segment.

[0015] Fig. 6 is a schematic diagram of the second tab connecting structure of the current collector shown in Fig. 1 being folded to the main body of the tab segment.

[0016] Fig. 7 is a schematic diagram of the second tab connecting structure of the current collector shown in Fig. 1.

[0017] Fig. 8 is a structural schematic diagram of the first part and the second part of the reinforcing part of the current collector shown in Fig. 1.

[0018] Fig. 9 is a structural schematic diagram of the third part of the reinforcing part of the current collector shown in Fig. 1 being folded to the inner side of the current collector body.

[0019] Fig. 10 is a structural schematic diagram of the current collector shown in Fig. 9 from another perspective.

[0020] Fig. 11 is a second structural schematic diagram of the current collector shown in Fig. 1.

[0021] Fig. 12 is a partial enlarged view of X in Fig. 11.

[0022] Fig. 13 is a third structural schematic diagram of the current collector shown in Fig. 1.

[0023] Fig. 14 is a partial enlarged view of Y in Fig. 13.

[0024] Fig. 15 is a structural schematic diagram of the structure of the current collector and the tab and the pole in an embodiment of the present application.

[0025] Fig. 16 is a structural schematic diagram of the current collector shown in Fig. 15.

[0026] Fig. 17 is a schematic diagram of the current collector forming a multi-segment arc-shaped welding track.

[0027] Fig. 18 is a schematic diagram of the current collector forming a circular ring-shaped welding track.

[0028] Fig. 19 is a second structural schematic diagram of the reinforcing part of the current collector shown in Fig. 15.

[0029] Fig. 20 is a second structural schematic diagram of the tab segment of the current collector shown in Fig. 15.

[0030] Fig. 21 is a schematic view of the tab connecting structure of the current collector shown in Fig. 20 being folded to the tab section body.

[0031] Fig. 22 is a schematic view of a structure in which the reinforcing portion of the current collector is folded to the inner side of the current collector body.

[0032] Fig. 23 is a schematic view of the structure of the current collector shown in Fig. 19.

[0033] Fig. 24 is an enlarged view of X in Fig. 23.

[0034] Fig. 25 is a schematic view of a third structure of the current collector shown in Fig. 20.

[0035] Fig. 26 is a schematic view of the structure of the current collector cooperating with the tab and the pole in an embodiment of the present application.

[0036] Fig. 27 is a schematic view of the current collector shown in Fig. 26 after being bent.

[0037] Fig. 28 is a schematic view of the structure of the current collector shown in Fig. 26.

[0038] Fig. 29 is a schematic view of the current collector shown in Fig. 26 forming a multi-segment arc-shaped welding track.

[0039] Fig. 30 is a schematic view of the current collector shown in Fig. 26 forming a circular ring-shaped welding track.

[0040] Fig. 31 is a schematic view of the structure of the current collector shown in Fig. 26 in which the reinforcing portion is arranged on the inner side of the current collector body.

[0041] Fig. 32 is a schematic view of a second structure of the tab section of the current collector shown in Fig. 26.

[0042] Fig. 33 is an enlarged view of X in Fig. 28.

[0043] Fig. 34 is a schematic view of the structure of the top cover assembly in an embodiment of the present application.

[0044] Fig. 35 is a schematic view of the size parameters of the top cover assembly shown in Fig. 34.

[0045] Fig. 36 is a schematic view of the structure of the battery in an embodiment of the present application.

[0046] Fig. 37 is a sectional view of the battery shown in Fig. 36 along the P-P direction.

[0047] Fig. 38 is a schematic view of the size parameters of the current collector shown in Fig. 37. Embodiments of the present application

[0048] In the description of the present application, unless specifically defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is less than that of the second feature.

[0050] In the description of the present embodiment, the terms "up", "down", "left", "right", "front", "back" and other orientation or position relationships are based on the orientation or position relationships shown in the drawings, which are for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used to distinguish the description and have no special meaning.

[0051] The present application provides a current collecting member 100, which comprises a current collecting member body 11 for electrically connecting with a pole and a tab, and a reinforcing portion 12 arranged on the current collecting member body 11.

[0052] Please refer to FIG. 1, which is a structural schematic diagram of the current collecting member cooperating with the tab and the pole according to an embodiment of the present application. The present embodiment provides a current collecting member 100. The current collecting member 100 is applied to a battery. The battery can be applied to an electrical equipment, which can include a game handle, a household appliance, a medical instrument, a transportation tool and the like powered by the battery, and the present embodiment does not limit this.

[0053] The current collector 100 can include a current collector body 11 and a reinforcing portion 12. The current collector body 11 includes a pole segment 111 and a tab segment 112 connected by bending. The pole segment 111 is used to electrically connect with the pole 200. The tab segment 112 is used to electrically connect with the tab 51. The reinforcing portion 12 is at least partially disposed on one side surface of the current collector body 11 in the thickness direction, thereby improving the ability of the current collector body 11 to resist bending deformation, so as to improve the reliability and service life of the battery.

[0054] It can be understood that the reinforcing portion 12 at least partially disposed on one side surface of the current collector body 11 in the thickness direction can be that the reinforcing portion 12 is only disposed on one side surface of the current collector body 11 in the thickness direction, or that both side surfaces of the current collector body 11 in the thickness direction are provided with the reinforcing portion 12, and the embodiments of the present application do not limit this.

[0055] In addition, when the reinforcing portion 12 is only disposed on one side surface of the current collector body 11 in the thickness direction, the reinforcing portion 12 can be disposed on the inner side surface of the current collector body 11 (i.e. the side surface of the current collector body 11 facing the core pack), or can be disposed on the outer side surface of the current collector body 11 (i.e. the side surface of the current collector body 11 away from the core pack), and the embodiments of the present application do not limit this.

[0056] It can also be understood that the reinforcing portion 12 at least partially disposed on one side surface of the current collector body 11 in the thickness direction can be that the reinforcing portion 12 is at least partially disposed on one side surface of the pole segment 111 in the thickness direction H1, or that the reinforcing portion 12 is at least partially disposed on one side surface of the tab segment 112 in the thickness direction H2, or of course the reinforcing portion 12 can be at least partially disposed on one side surface of other parts of the current collector body 11 (such as the holding segment to be introduced later).

[0057] For example, only one side surface of the thickness direction H1 of the pole segment 111 can be provided with the reinforcing portion 12, or only one side surface of the thickness direction H2 of the tab segment 112 can be provided with the reinforcing portion 12, or both side surfaces of the thickness direction of the pole segment 111 and the tab segment 112 can be provided with the reinforcing portion 12, and the embodiments of the present application do not limit this.

[0058] In some embodiments, the widths of the pole segment 111 and the tab segment 112 along the length direction of the current collector body 11 can be substantially equal, so that the pole segment 111 and the tab segment 112 can be made wider, thereby improving the current flow capacity of the pole segment 111 and the tab segment 112, and at the same time, taking the current collector body 11 as a metal plate, the material waste caused by the partial concave or convex of the pole segment 111 and / or the tab segment 112 can be reduced.

[0059] The above is a general description of the current collector 100. The connection structure of the pole segment 111 and the pole 200 will be described below.

[0060] Referring to FIG. 2, the pole segment 111 is provided with a pole connection structure 1111 for electrically connecting the pole 200, so that the pole segment 111 and the pole 200 can be electrically connected.

[0061] For example, the pole connection structure 1111 can include a pole mounting hole for mounting the pole 200 to electrically connect the pole 200. During assembly, the pole 200 can be inserted into the pole mounting hole to achieve mounting.

[0062] In some embodiments, the pole segment 111 can also include a positioning hole 1112. The positioning hole 1112 is located between the pole connection structure 1111 and the tab segment 112. Correspondingly, other structures inside the battery, such as the cover to be explained later, can be provided with a positioning column that is inserted into the positioning hole 1112, so that the cooperation of the positioning hole 1112 and the positioning column can limit the rotation or movement of the current collector body 11 relative to the cover 300 of the battery.

[0063] In some embodiments, the reinforcing portion 12 at least partially surrounds the pole mounting hole and forms a positioning step 1113 around the pole mounting hole. Thus, the positioning step 1113 can facilitate the quick and accurate positioning of the pole 200, thereby improving the production and assembly efficiency of the battery.

[0064] It should also be understood that the pole mounting hole can be a through hole or a blind hole, and the embodiments of the present application do not limit this.

[0065] In some embodiments, the pole connection structure 1111 can also be used for welding structures such as friction welding, laser welding, ultrasonic welding with the pole 200, and the embodiments of the present application do not limit this. As long as the structure is used to achieve the connection between the pole connection structure 1111 and the pole 200, it is within the protection scope of the pole connection structure 1111 of the present application.

[0066] For example, referring to FIG. 3 and FIG. 4, FIG. 3 is a schematic diagram of the current collector shown in FIG. 1 forming a plurality of arc-shaped welding tracks, and FIG. 4 is a schematic diagram of the current collector shown in FIG. 1 forming a circular ring-shaped welding track. The pole 200 can use a fusion welding process at the pole mounting hole, thereby forming a closed circular welding track and also forming a plurality of arc-shaped welding tracks.

[0067] Please refer to FIG. 2 and FIG. 5, FIG. 5 is a schematic diagram of the tab connecting structure of the current collector shown in FIG. 1 being folded to the tab segment main body. In the following, the technical solutions of the embodiments of the present application will be illustrated by taking the tab segment 112 as an example.

[0068] The tab segment 112 is provided with a tab connecting structure 1121 for electrically connecting with the tab 51, so as to realize the electrical connection between the tab segment 112 and the tab 51.

[0069] For example, the tab segment 112 includes a tab segment main body 1122 and the tab connecting structure 1121. The tab segment main body 1122 is connected with the tab segment 111, and the tab connecting structure 1121 is foldably connected with the tab segment main body 1122. The tab connecting structure 1121 is used for being welded and fixed with the tab 51. For example, the tab connecting structure 1121 can be used for being welded and fixed with the tab 51 by ultrasonic welding or laser welding.

[0070] Then, in the actual assembly process of the battery, as shown in FIG. 2, the tab connecting structure 1121 can be first connected with the tab segment main body 1122 perpendicularly, so as to stand up the tab segment 112 and weld it with the tab 51. After the tab connecting structure 1121 is welded and fixed with the tab 51, as shown in FIG. 5, the tab connecting structure 1121 and the tab 51 are folded to be attached to the tab segment main body 1122, so that the structure inside the battery is more compact, and the energy density of the battery is improved.

[0071] Please refer to FIG. 5 and FIG. 6, FIG. 6 is a schematic diagram of the second tab connecting structure of the current collector shown in FIG. 1 being folded to the tab segment main body. It can be understood that the number of the tab connecting structure 1121 can be one, or multiple such as two, three, four or five, and the embodiments of the present application do not limit this.

[0072] In some embodiments, each tab connecting structure 1121 is provided with a welding mark area for welding with the tab 51. Along the width direction H3 of the current collector body 11, the difference between the width of at least one tab segment 112 and the width of the welding mark area thereof is greater than or equal to 2 millimeters. In the process of welding the tab connecting structure 1121 with the tab 51, the external tooling equipment can fix the tab connecting structure 1121 through the position of the tab segment 112 where the welding mark area is not arranged, so as to improve the welding quality of the tab connecting structure 1121 with the tab 51, thereby improving the reliability and service life of the battery.

[0073] For example, the difference between the width of each tab connecting structure 1121 and the width of the welding mark area thereof can be 2 millimeters, 2.2 millimeters, 2.45 millimeters, 2.5 millimeters, 2.7 millimeters, 2.98 millimeters, 3 millimeters, 3.4 millimeters, 3.95 millimeters or 4 millimeters, and the embodiments of the present application do not limit this.

[0074] In some embodiments, the tab segment body 1122 and the tab connecting structure 1121 can be integrally bent and formed.

[0075] In order to facilitate the bending of the tab connecting structure 1121 in the process of assembling the battery, the connection between the tab segment body 1122 and the tab connecting structure 1121 can be provided with a score groove.

[0076] It can also be understood that the connection between the tab segment body 1122 and the tab connecting structure 1121 can be a circular arc transition, so as to avoid the formation of a straight edge at the bent connection between the tab segment body 1122 and the tab connecting structure 1121, thereby causing damage to the internal components of the battery, such as the insulating film and the tab 51.

[0077] In the width direction H3 of the current collector body 11, the ratio of the width of the tab segment body 1122 to the width of the pole segment 111 is 0.8-1.2. Thus, the part of the tab segment body 1122 connected to the tab connecting structure 1121 can not be significantly inwardly recessed or outwardly convex in the width direction H3 of the current collector body 11, which can improve the material utilization rate of the sheet metal material, and can improve the strength and flow capacity of the tab segment 112.

[0078] As mentioned above, in some embodiments, at least one side surface of the tab segment 112 in the thickness direction H2 is provided with a reinforcing portion 12. Then, as shown in FIG. 5, the side surface of the tab segment body 1122 in the thickness direction H2 includes a first region 1124 and a second region 1123. The reinforcing portion 12 is partially attached to the first region 1124. The tab connecting structure 1121 can be bent to be attached to the second region 1123.

[0079] For example, before the tab connecting structure 1121 is welded with the tab 51, the tab connecting structure 1121 is vertically connected with the tab segment body 1122; after the tab connecting structure 1121 is welded with the tab 51, the tab connecting structure 1121 is bent to be attached to the second region 1123.

[0080] For example, before the tab connecting structure 1121 is welded with the tab 51, the tab connecting structure 1121 is bent to be attached to the second region 1123, and then the tab connecting structure 1121 is welded with the tab 51.

[0081] At the tab section 112, the reinforcing portion 12 and the bent tab connecting structure 1121 can be arranged side by side on the same side surface of the thickness direction H2 of the tab section body 1122, and then compared with the tab section body 1122, the reinforcing portion 12 and the tab connecting structure 1121 are sequentially stacked, the total thickness at the tab section 112 can be effectively reduced, so that the internal structure of the battery can be more compact, and the energy density of the battery can be improved.

[0082] Please continue to refer to FIG. 7, which is a schematic diagram of a second tab connecting structure of the current collector shown in FIG. 1. In this embodiment, at least part of the reinforcing portion 12 can extend from the pole connecting structure 1111 through the bent connection between the pole section 111 and the tab section 112 to the tab connecting structure 1121. Thus, by the reinforcing portion 12, the strength of the part of the current collector body 11 between the tab connecting structure 1121 and the pole connecting structure 1111 can be strengthened to avoid bending deformation or even breakage of this part, thereby avoiding short circuit, open circuit, current overcurrent capacity reduction and other situations inside the battery, thereby improving the reliability and service life of the battery.

[0083] It should be noted that the bent connection between the pole section 111 and the tab section 112 can be understood as the boundary between the pole section 111 and the tab section 112.

[0084] In the embodiment of the application, the reinforcing portion 12 extends to the tab connecting structure 1121, which can be spaced apart from the tab connecting structure 1121, thereby having a certain gap. Of course, in other embodiments, the reinforcing portion 12 can also partially overlap or be attached to the tab connecting structure 1121, which is not limited in the application.

[0085] In the embodiment of the application, the reinforcing portion 12 can extend from the pole connecting structure 1111 through the bent connection between the pole section 111 and the tab section 112, which can be spaced apart from the pole connecting structure 1111, thereby having a certain gap. Of course, in other embodiments, the reinforcing portion 12 can also partially overlap or be attached to the pole connecting structure 1111, which is not limited in the application.

[0086] The reinforcing portion 12 can include a first reinforcing portion 121 and a second reinforcing portion 122. The first reinforcing portion 121 extends at least partially from the pole connecting structure 1111 to the tab section 112, and the second reinforcing portion 122 extends at least partially from the tab connecting structure 1121 to the pole section 111. Then, the first reinforcing portion 121 and the second reinforcing portion 122 can be bent and connected, so that the reinforcing portion 12 can extend at least partially from the pole connecting structure 1111 to the tab connecting structure 1121.

[0087] The first reinforcing portion 121 is in electrical conduction with the pole post segment 111, and the second reinforcing portion 122 is in electrical conduction with the tab segment 112. Thus, the first reinforcing portion 121 and the second reinforcing portion 122 can also form a current flow structure for current to flow from the tab connecting structure 1121 to the pole post connecting structure 1111, so as to improve the current flow energy of the current collector 100 from the tab connecting structure 1121 to the pole post connecting structure 1111, and improve the performance of the battery.

[0088] The reinforcing portion 12 is made of conductive material, and is attached to the current collector body 11 at the portion between the pole post connecting structure 1111 and the tab connecting structure 1121. Thus, the cross-sectional area of the current collector 100 from the tab connecting structure 1121 to the pole post connecting structure 1111 is increased, so as to improve the current flow energy of the current collector 100 from the tab connecting structure 1121 to the pole post connecting structure 1111, and improve the performance of the battery.

[0089] In some other embodiments, the reinforcing portion 12 can include the first reinforcing portion 121 but not the second reinforcing portion 122, or vice versa.

[0090] When the reinforcing portion 12 includes the first reinforcing portion 121, the first reinforcing portion 121 at least partially extends from the pole post connecting structure 1111 to the bending joint between the pole post segment 111 and the tab segment 112. For example, the first reinforcing portion 121 can only extend from the pole post connecting structure 1111 to the bending joint between the pole post segment 111 and the tab segment 112, or the first reinforcing portion 121 can also extend to the side of the pole post connecting structure 1111 away from the tab segment 112, which is not limited in the embodiments of the present application.

[0091] For example, the first reinforcing portion 121 can extend from the end of the pole post segment 111 close to the tab segment 112 (i.e., the bending joint between the pole post segment 111 and the tab segment 112) to the end of the pole post segment 111 away from the tab segment 112, so as to provide good reinforcement effect for each position of the pole post segment 111.

[0092] Correspondingly, the first reinforcing portion 121 can be in electrical conduction with the pole post segment 111 in various ways. For example, the first reinforcing portion 121 and the pole post segment 111 can be integrally bent and formed, so that the first reinforcing portion 121 is connected to the side edge of the pole post segment 111 at each position between the pole post connecting structure 1111 and the tab segment 112.

[0093] Optionally, the first reinforcing portion 121 can be made of an electrically conductive material and attached to the pole segment 111, so that the abutment of the first reinforcing portion 121 and the pole segment 111 forms an electrically conductive structure. For example, the first reinforcing portion 121 can be integrally bent and formed with the pole segment 111, so that the first reinforcing portion 121 is attached to at least one side surface of the pole segment 111 in the thickness direction H1.

[0094] When the reinforcing portion 12 includes the second reinforcing portion 122, the second reinforcing portion 122 at least partially extends from the tab connecting structure 1121 to the bending connection between the pole segment 111 and the tab segment 112. For example, the second reinforcing portion 122 can only extend from the tab connecting structure 1121 to the bending connection between the pole segment 111 and the tab segment 112, or the second reinforcing portion 122 can also extend to the side of the tab connecting structure 1121 away from the pole segment 111, which is not limited in the embodiments of the present application.

[0095] For example, the second reinforcing portion 122 can extend from the end of the tab segment 112 close to the pole segment 111 (i.e., the bending connection between the tab segment 112 and the pole segment 111) to the end of the tab segment 112 away from the pole segment 111, so as to provide good reinforcement effect for each position of the pole segment 111.

[0096] The second reinforcing portion 122 and the tab segment 112 can be integrally bent and formed. The second reinforcing portion 122 can be connected to the side edge of the tab segment 112 at each position between the tab connecting structure 1121 and the pole segment 111.

[0097] Optionally, the second reinforcing portion 122 can be made of an electrically conductive material and attached to the tab segment 112, so that the abutment of the second reinforcing portion 122 and the tab segment 112 forms an electrically conductive structure.

[0098] For example, the second reinforcing portion 122 and the tab segment 112 can be integrally bent and formed, so that the second reinforcing portion 122 is attached to at least one side surface of the tab segment 112 in the thickness direction H2.

[0099] In some embodiments, the reinforcing portion 12 is integrally bent and formed with the current collector body 11. Therefore, when a thicker single-layer plate is used to replace the current collector body 11 and the reinforcing portion 12 under the condition that the thickness of the entire current collector 100 is constant, the thickness of the tab connecting structure 1121 will also be correspondingly larger, which on the one hand leads to the tab connecting structure 1121 being too thick and not easy to bend and lay flat on the tab segment 112, and on the other hand can also lead to a waste of more space inside the battery at the tab segment 112, thereby reducing the energy density of the battery.

[0100] It can also be understood that the outer side of the connection between the reinforcing portion 12 and the current collector body 11 can be arc-shaped, so as to avoid the formation of a straight edge at the bent connection between the reinforcing portion 12 and the current collector body 11, thereby causing damage to the internal components of the battery, such as the insulating film.

[0101] In some embodiments, at least one side edge of the current collector body 11 in the width direction H3 is connected to the reinforcing portion 12 in a bent manner, so that the reinforcing portion 12 is attached to at least one side surface of the current collector body 11 in the thickness direction.

[0102] Then, when the reinforcing portion 12 includes the first reinforcing portion 121, at least one side edge of the current collector body 11 in the width direction H3 can be connected to the first reinforcing portion 121 in a bent manner, so that the reinforcing portion 12 is attached to at least one side surface of the current collector body 11 in the thickness direction.

[0103] When the reinforcing portion 12 includes the second reinforcing portion 122, at least one side edge of the current collector body 11 in the width direction H3 can be connected to the second reinforcing portion 122 in a bent manner, so that the reinforcing portion 12 is attached to at least one side surface of the current collector body 11 in the thickness direction. In addition, when the reinforcing portion 12 further includes other portions (such as the third reinforcing portion to be described later), at least one side edge of the current collector body 11 in the width direction H3 can be connected to the other portions (such as the third reinforcing portion to be described later) of the reinforcing portion 12 in a bent manner, so that the reinforcing portion 12 is folded to at least one side surface of the current collector body 11 in the thickness direction.

[0104] Please refer to FIG. 7 and FIG. 8 together, and FIG. 8 is a schematic structural view of the first portion and the second portion of the reinforcing portion in the current collector shown in FIG. 1. The current collector body 11 can include a first side edge 113 and a second side edge 114 arranged opposite to each other in the width direction H3. Then, the reinforcing portion 12 can be connected to only the first side edge 113, the reinforcing portion 12 can also be connected to only the second side edge 114, the reinforcing portion 12 can also be connected to the first side edge 113 partially and connected to the second side edge 114 partially, and the embodiments of the present application do not limit this.

[0105] For example, the reinforcing portion 12 can include a first portion 12a and a second portion 12b. The first portion 12a is connected to the first side edge 113 in a bent manner, and the second portion 12b is connected to the second side edge 114 in a bent manner.

[0106] The first portion 12a and the second portion 12b can be arranged opposite to each other in the width direction H3 of the current collector body 11. The first portion 12a and the second portion 12b are located on the same side surface of the current collector body 11 in the thickness direction.

[0107] Then, in the actual production process, the 180° bending can be performed simultaneously from both sides of the current collector body 11 in the width direction to form the first part 12a and the second part 12b, respectively.

[0108] It can also be understood that the first part 12a can be formed only with the first reinforcing portion 121, the first part 12a can be formed only with the second reinforcing portion 122, and the first part 12a can be partially formed with the second reinforcing portion 122 and partially formed with the first reinforcing portion 121. The second part 12b can be formed only with the first reinforcing portion 121, the second part 12b can be formed only with the second reinforcing portion 122, and the second part 12b can be partially formed with the second reinforcing portion 122 and partially formed with the first reinforcing portion 121, which is not limited in the embodiments of the present application.

[0109] For example, the first reinforcing portion 121 includes a first folding portion 1211 and a second folding portion 1212. The first folding portion 1211 and the second folding portion 1212 are oppositely arranged along the width direction H3 of the current collector body 11. Among them, one of the first part 12a and the second part 12b is formed with the first folding portion 1211, and the other of the first part 12a and the second part 12b is formed with the second folding portion 1212.

[0110] The second reinforcing portion 122 can also include a third folding portion 1221 and a fourth folding portion 1222. The third folding portion 1221 and the fourth folding portion 1222 are oppositely arranged along the width direction H3 of the current collector body 11. Among them, one of the first part 12a and the second part 12b is formed with the third folding portion 1221, and the other of the first part 12a and the second part 12b is formed with the fourth folding portion 1222.

[0111] In some embodiments, the third folding portion 1221 and the tab connecting structure 1121 can be arranged side by side on the same side of the fourth folding portion 1222.

[0112] In some embodiments, the third fold 1221 and the tab connecting structure 1121 can be arranged in a spaced manner. On the one hand, in the actual production process of the battery, the third fold 1221 attached to the tab section 112 can be bent first, and the tab connecting structure 1121 perpendicular to the tab section 112 can be bent. At this time, since the third fold 1221 and the tab connecting structure 1121 are arranged in a spaced manner, the third fold 1221 and the tab connecting structure 1121 can be bent to different angles more conveniently and accurately. On the other hand, when the tab connecting structure 1121 needs to be bent to be attached to the tab section 112 after being welded with the tab 51, even if there is a certain deviation in the position accuracy of the bending of the tab connecting structure 1121, so that the tab connecting structure 1121 is inclined towards the third fold 1221, the third fold 1221 and the tab connecting structure 1121 are also less likely to interfere with each other.

[0113] In some embodiments, the gap between the first portion 12a and the second portion 12b along the width direction H3 of the current collector body 11 can be greater than or equal to 0.2 mm. Therefore, it can also be understood that a margin is reserved between the first portion 12a and the second portion 12b to prevent the second portion 12b and the second portion 12b from interfering with each other when the first portion 12a and the second portion 12b are bent by the bending process, thereby improving the reliability and forming quality of the current collector body 11 after being bent and formed.

[0114] For example, the gap C between the first portion 12a and the second portion 12b along the width direction H3 of the current collector body 11 can be 0.2 mm, 0.21 mm, 0.224 mm, 0.237 mm, 0.245 mm, 0.25 mm, 0.27 mm, 0.3 mm, 0.35 mm, 0.391 mm, 0.4 mm, 0.423 mm, 0.45 mm, 0.5 mm, 0.571 mm, 0.64 mm, 0.689 mm, 0.7 mm, 0.721 mm, 0.753 mm, 0.8 mm, 0.849 mm, 0.9 mm, 0.914 mm, 0.95 mm, 0.974 mm, 0.99 mm, 1 mm or 1.1 mm, etc., which are not limited in the embodiments of the present application.

[0115] In some embodiments, the gap C between the first portion 12a and the second portion 12b can be 0.5 to 1 millimeter. In one aspect, by reserving a gap between the first portion 12a and the second portion 12b greater than or equal to 0.5 millimeter, interference between the first portion 12a and the second portion 12b due to errors in actual bending processing can be avoided. In another aspect, by reserving a gap between the first portion 12a and the second portion 12b less than or equal to 1 millimeter, the first portion 12a and the second portion 12b can be made as large as possible, thereby improving the overall strength of the current collector 100 and improving the current carrying capacity of the current.

[0116] In some embodiments, along the width direction H3 of the current collector body 11, the width of the current collector body 11 can be W1, the width of the first portion 12a can be A, the gap between the first portion 12a and the second portion 12b can be C, and the width of the second portion 12b can be B, then B = W - A - C.

[0117] In some embodiments, when the pole segment 111 is further provided with a positioning hole 1112, the positioning hole 1112 is at least partially located between the first portion 12a and the second portion 12b. Thus, after the first portion 12a and the second portion 12b are bent, the positioning hole 1112 is not closed, so that further punching operations are not required, thereby making the manufacturing of the current collector 100 simpler.

[0118] In some embodiments, when the tab segment 112 includes a tab segment body 1122 and a tab connecting structure 1121, the number of the tab connecting structure 1121 is at least one. At least one of the first side edge 113 and the second side edge 114 is connected with the tab connecting structure 1121.

[0119] Correspondingly, the ratio of the tab connecting structure 1121 to the first portion 12a or the second portion 12b connected to the same side edge of the current collector body 11 is 0.8-1.2, such as 0.8, 0.845, 0.9, 0.941, 0.954, 1, 1.054, 1.1, 1.16 or 1.2, which is not limited in the embodiments of the present application. Thus, by the width of the tab connecting structure 1121 and the first portion 12a or the second portion 12b connected to the same side edge of the current collector body 11 being substantially the same, the material utilization rate of the sheet metal raw material used for bending the current collector 100 can be improved.

[0120] For example, the tab connecting structure 1121 can include a first tab connecting structure 1121a and a second tab connecting structure 1121b arranged opposite to each other along the width direction H3 of the current collector body 11. The first tab connecting structure 1121a is connected to the first side edge 113 and has substantially the same width as the first portion 12a. The second tab connecting structure 1121b is connected to the second side edge 114 and has substantially the same width as the second portion 12b.

[0121] Of course, the tab connecting structure 1121 can also include only one of the first tab connecting structure 1121a and the second tab connecting structure 1121b described above, and the embodiments of the present application do not limit this.

[0122] It can be understood that the first folding portion 1211 and the second folding portion 1212 can be formed by the first portion 12a and the second portion 12c, respectively, as mentioned above. Therefore, the gap between the first folding portion 1211 and the second folding portion 1212 can refer to the gap between the first portion 12a and the second portion 12b described above, and the embodiments of the present application do not repeat here. In addition, the size relationship between the first folding portion 1211 and the second folding portion 1212 and the tab connecting structure 1121 can refer to the size relationship between the first portion 12a and the second portion 12b and the tab connecting structure 1121 described above, and the embodiments of the present application do not repeat here.

[0123] It can also be understood that the third folding portion 1221 and the fourth folding portion 1222 can be formed by the first portion 12a and the second portion 12c, respectively, as mentioned above. Then, the gap between the third folding portion 1221 and the fourth folding portion 1222 can refer to the gap between the first portion 12a and the second portion 12b described above, and the embodiments of the present application do not repeat here. In addition, the size relationship between the third folding portion 1221 and the fourth folding portion 1222 and the tab connecting structure 1121 can refer to the size relationship between the first portion 12a and the second portion 12b and the tab connecting structure 1121 described above, and the embodiments of the present application do not repeat here.

[0124] Please continue to refer to FIG. 9 and FIG. 10, FIG. 9 is a structure schematic diagram of the third portion of the reinforcing portion being folded to the inside of the current collector body in the current collector shown in FIG. 1, and FIG. 10 is a structure schematic diagram of another view of the current collector in FIG. 9. In some embodiments, the reinforcing portion 12 can include a third portion 12c. One side of the third portion 12c along the width direction H3 of the current collector body 11 is connected to one of the first side edge 113 and the second side edge 114 by bending, and the other side of the third portion 12c along the width direction H3 of the current collector body 11 is arranged adjacent to the other one of the first side edge 113 and the second side edge 114.

[0125] Therefore, in the actual bending process, the third portion 12c is bent from one side of the current collector body 11, and covers each part in the width direction H3 of the current collector body 11.

[0126] In some embodiments, the width of the third portion 12c is less than the width of the current collector body 11 in the width direction H3 of the current collector body 11.

[0127] In some embodiments, when the tab section 112 includes the tab section body 1122 and the tab connecting structure 1121, the tab connecting structure 1121 is connected to the first side edge 113, and the width of the tab connecting structure 1121 can be the same as the width of the third portion 12c. Thus, the material utilization rate of the sheet metal used for bending the current collector 100 can be improved.

[0128] When the reinforcing portion 12 includes the first reinforcing portion 121, the first reinforcing portion 121 can be formed by the third portion 12c described above. Therefore, one side of the first reinforcing portion 121 in the width direction H3 of the current collector body 11 can be connected to one of the first side edge 113 and the second side edge 114 by bending, and the other side of the first reinforcing portion 121 in the width direction H3 of the current collector body 11 can be arranged adjacent to the other of the first side edge 113 and the second side edge 114.

[0129] When the reinforcing portion 12 includes the second reinforcing portion 122, the second reinforcing portion 122 can be formed by the third portion 12c described above. Therefore, one side of the second reinforcing portion 122 in the width direction H3 of the current collector body 11 can be connected to one of the first side edge 113 and the second side edge 114 by bending, and the other side of the second reinforcing portion 122 in the width direction H3 of the current collector body 11 can be arranged adjacent to the other of the first side edge 113 and the second side edge 114.

[0130] When the reinforcing portion 12 includes other portions (such as the third reinforcing portion described below), the other portions (such as the third reinforcing portion described below) can be formed by the third portion 12c described above. Therefore, one side of the other portions (such as the third reinforcing portion described below) in the width direction H3 of the current collector body 11 can be connected to one of the first side edge 113 and the second side edge 114 by bending, and the other side of the other portions (such as the third reinforcing portion described below) in the width direction H3 of the current collector body 11 can be arranged adjacent to the other of the first side edge 113 and the second side edge 114.

[0131] Please continue to refer to Figure 11, Figure 11 is a second structure schematic diagram of the current collector shown in Figure 1. In some embodiments, the reinforcing part 12 comprises a connected side edge 124 and a free side edge 125. The connected side edge 124 is connected to one side edge of the current collector body 11 in the width direction H3. The free side edge 125 is arranged adjacent to one side edge of the current collector body 11 in the length direction, and the free side edge 125 is provided with a clearance structure 126 which is recessed from the side edge of the current collector body 11 adjacent to the clearance structure 126, so as to limit the end of the free side edge 125 away from the connected side edge 124 from protruding outward of the current collector body 11 in the length direction.

[0132] After the reinforcing part 12 is bent to adhere to one side of the current collector body 11 in the thickness direction, even if the reinforcing part 12 is inclined at a certain angle towards the outside of the current collector body 11 in the length direction due to processing errors, the clearance structure 126 can prevent the end of the free side edge 125 away from the connected side edge 124 from protruding outward of the current collector body 11 in the length direction to form a sharp protrusion. Then, during the subsequent battery assembly process, the end of the free side edge 125 away from the connected side edge 124 can be prevented from forming a sharp protrusion to stab other structures inside the battery (such as puncturing the insulating film), thereby ultimately improving the reliability and service life of the battery.

[0133] The clearance structure 126 can be a clearance groove, a chamfer, or a notch, and the embodiments of the present application do not limit the same.

[0134] For example, please continue to refer to Figure 12, Figure 12 is a partial enlarged view of X in Figure 11. The free side edge 125 comprises a first free side edge 1251. The first free side edge 1251 is arranged adjacent to the side edge of the pole segment 111 away from the tab segment 112. The clearance structure 126 comprises a first clearance structure arranged on the first free side edge 1251. Thus, the end of the pole segment 111 away from the tab segment 112 can be prevented from forming a sharp corner.

[0135] Please continue to refer to Figure 13, Figure 13 is a third structure schematic diagram of the current collector shown in Figure 1. In some embodiments, the free side edge 125 further comprises a second free side edge 1252. The second free side edge 1252 is arranged adjacent to the side edge of the current collector body 11 away from the pole segment 111, and the clearance structure 126 comprises a second clearance structure arranged on the second free side edge 1252. Thus, the end of the electrical connection part away from the pole segment 111 can be prevented from forming a sharp corner.

[0136] It can also be understood that the end of the tab segment 112 away from the pole segment 111 can form the end of the current collector body 11 away from the pole segment 111, or the current collector body 11 can further comprise other structures connected to the end of the tab segment 112 away from the pole segment 111, and the embodiments of the present application do not limit the same.

[0137] For example, please continue to refer to FIG. 14, which is an enlarged view of Y in FIG. 13. The current collector body 11 can further include a holding section 115. The holding section 115 is connected to one end of the tab section 112 away from the pole section 111. The holding section 115 protrudes from the side surface of the tab section 112 away from the core pack, so as to be clamped by external equipment.

[0138] After the tab connecting structure 1121 is welded to the tab 51, the holding section 115 can be clamped by external equipment first, and then the whole of the tab 51 and the tab connecting structure 1121 is bent to fold on the tab section 112. By providing the holding section 115, the bending accuracy of the tab connecting structure 1121 and the tab 51 can be improved. In addition, the stress of the current collector 100 during the bending of the tab connecting structure 1121 and the tab 51 can be transferred to the external equipment, so as to avoid the current collector 100 crushing the core pack.

[0139] In some embodiments, the ratio of the width of the holding section 115 and the tab section 112 is 0.8-1.2, such as 0.8, 0.845, 0.9, 0.941, 0.954, 1, 1.054, 1.1, 1.16 or 1.2, which is not limited in the embodiments of the present application, so that the width of the holding section 115 and the tab section 112 is substantially the same. On the one hand, the holding section 115 and the tab section 112 can be made wider, so as to improve the strength of the holding section 115 and the tab section 112, and on the other hand, the utilization rate of the sheet metal material can be improved.

[0140] In some embodiments, the reinforcing part 12 is at least partially provided on one side surface of the holding section 115 in the thickness direction H2. For example, the reinforcing part 12 can be provided on only one side surface of the holding section 115 in the thickness direction H2, or the reinforcing part 12 can be provided on both side surfaces of the holding section 115 in the thickness direction H2, which is not limited in the embodiments of the present application.

[0141] For example, the reinforcing part 12 further includes a third reinforcing part 123. The third reinforcing part 123 is provided on at least one side surface of the holding section 115 in the thickness direction H2. Thus, by the third reinforcing part 123, the strength of the holding section 115 can be effectively improved, so that the external equipment can more stably clamp the holding section 115, and the bending accuracy of the tab connecting structure 1121 and the tab 51 can be improved.

[0142] In some embodiments, the third reinforcing part 123 can be bent with the holding section 115, so as to be attached to one side surface of the holding section 115 in the thickness direction H2.

[0143] Then, the third reinforcing portion 123 can include a connected side 124 and a second free side 1252. The connected side 124 is connected to one side edge of the holding section 115 along the width direction H3 of the current collector body 11. The second free side 1252 is arranged adjacent to one side edge of the holding section 115 away from the tab section 112, and one end of the second free side 1252 away from the connected side 124 is provided with a clearance structure 126 (i.e., the second clearance structure described above). The clearance structure 126 is recessed from the one side edge of the holding section 115 away from the tab section 112, so as to limit the one end of the second free side 1252 away from the connected side 124 from protruding beyond the one side edge of the holding section 115 away from the tab section 112.

[0144] In some embodiments, the third reinforcing portion 123 can be arranged spaced apart from the tab connecting structure 1121. Then, on the one hand, in the actual production process of the battery, the third reinforcing portion 123 can be first bent to be arranged on the holding section 115, and the tab connecting structure 1121 can be bent to be perpendicular to the tab section 112. At this time, since the third reinforcing portion 123 and the tab connecting structure 1121 are arranged spaced apart, the third reinforcing portion 123 and the tab connecting structure 1121 can be more conveniently and accurately bent to different angles. On the other hand, when the tab connecting structure 1121 needs to be folded to the tab post section 111 after being welded with the tab 51, even if the position accuracy of the bending of the tab section 112 has a certain deviation, so that the tab section 112 tilts towards the third reinforcing portion 123, the third reinforcing portion 123 and the tab connecting structure 1121 are also less likely to interfere with each other.

[0145] For example, the third reinforcing portion 123 can include a fifth folding portion 1231 and a sixth folding portion 1232 arranged opposite to each other along the width direction H3 of the current collector body 11. The fifth folding portion 1231 is connected to the first side 113, and the sixth folding portion 1232 is connected to the second side 114.

[0146] Then, the fifth folding portion 1231 and the tab connecting structure 1121 can be both bent from the first side 113. In addition, the fifth folding portion 1231 and the tab connecting structure 1121 are arranged spaced apart along the length direction of the current collector body 11.

[0147] The width of the fifth folding portion 1231 can be substantially the same as the width of the tab connecting structure 1121. Thus, the material utilization rate of the sheet metal used for bending the current collector 100 can be improved.

[0148] As mentioned above, the reinforcing portion 12 can include a first portion 12a and a second portion 12b. The first portion 12a is connected to the first side edge 113 by bending, and the second portion 12b is connected to the second side edge 114 by bending. Then, the first portion 12a can be located in the portion of the holding section 115 to form the fifth fold 1231, and the second portion 12b can be located in the portion of the holding section 115 to form the sixth fold 1232.

[0149] Therefore, the gap between the fifth fold 1231 and the sixth fold 1232 can refer to the gap between the first portion 12a and the second portion 12b mentioned above, which will not be repeated here. In addition, the size relationship between the fifth fold 1231, the sixth fold 1232 and the tab connecting structure 1121 can refer to the size relationship between the first portion 12a, the second portion 12b and the tab connecting structure 1121 mentioned above, which will not be repeated here.

[0150] In some embodiments, the third reinforcing portion 123 is connected to one of the first side edge 113 and the second side edge 114 by bending on one side of the width direction H3 of the current collector body 11, and the other of the first side edge 113 and the second side edge 114 is located adjacent to the third reinforcing portion 123 on the other side of the width direction H3 of the current collector body 11.

[0151] As mentioned above, the reinforcing portion 12 can include a third portion 12c. The third portion 12c is connected to one of the first side edge 113 and the second side edge 114 by bending on one side of the width direction H3 of the current collector body 11, and the other of the first side edge 113 and the second side edge 114 is located adjacent to the third portion 12c on the other side of the width direction H3 of the current collector body 11. Then, the third portion can be located in the portion of the holding section 115 to form the third reinforcing portion 123.

[0152] In some embodiments, the reinforcing portion 12 includes a connected side edge 124 and a free side edge 125. The connected side edge 124 is connected to one side edge of the width direction H3 of the current collector body 11. The free side edge 125 is located adjacent to one side edge of the length direction of the current collector body 11 to form one end of the current collector 100 in the length direction. The current collector 100 is provided with an avoidance gap 127 at at least one corner of the end of the free side edge 125.

[0153] For example, after the reinforcing portion 12 is bent to adhere to one side of the thickness direction of the current collector body 11, the holding section 115 can be punched out of the second hollow structure together with the reinforcing portion 12 by a punching process to avoid the formation of a sharp corner at the connection between the end of the holding section 115 away from the tab section 112 and the end of the reinforcing portion 12 away from the tab section 112. Then, during the subsequent battery assembly process, the second free side 125 can be prevented from forming a sharp protrusion at the end close to the connecting side 124 to pierce other structures inside the battery (such as piercing the insulation film), thereby ultimately improving the reliability and service life of the battery.

[0154] It can be understood that the above has mentioned that the free side 125 can include the first free side 1251 and the second free side 1252. Then, the avoidance gap 127 can be provided only at the first free side 1251, only at the second free side 1252, or at both the first free side 1251 and the second free side 1252, which is not limited in the embodiments of the present application.

[0155] In some embodiments, the avoidance gap 127 can be provided at the end of the free side 125 close to the connecting side 124, and the avoidance structure 126 can be provided at the end of the free side 125 away from the connecting side 124. Of course, the current collector 100 can be provided only with the avoidance structure 126, only with the avoidance gap 127, or with both the avoidance structure 126 and the avoidance gap 127, which is not limited in the embodiments of the present application.

[0156] The above is some example description of the current collector 100 of the embodiments of the present application.

[0157] Please refer to FIG. 15, which is a structural schematic diagram II of the current collector cooperating with the tab and the pole provided by the embodiments of the present application.

[0158] The current collector 100 can include a current collector body 11 and a reinforcing portion 12. The current collector body 11 includes a pole section 111 and a tab section 112 bent and connected. The pole section 111 is used for electrical connection with the pole 200. The tab section 112 is used for electrical connection with the tab 51 of the core package. Then, the current collector 100 can also be understood as the pin of the battery. The reinforcing portion 12 is at least partially provided on one side surface of the thickness direction H1 of the pole section 111, thereby improving the bending resistance of the pole section 111 to improve the reliability and service life of the battery.

[0159] It can be understood that the reinforcing portion 12 is arranged at least partially on one side surface of the pole segment 111 in the thickness direction H1. The reinforcing portion 12 can be arranged only on one side surface of the pole segment 111 in the thickness direction H1, or both side surfaces of the pole segment 111 in the thickness direction H1 can be provided with the reinforcing portion 12, which is not limited in the embodiments of the present application.

[0160] When the reinforcing portion 12 is arranged only on one side surface of the pole segment 111 in the thickness direction, the reinforcing portion 12 can be arranged on the inner side surface of the pole segment 111 (i.e. the side surface of the pole segment 111 facing the core pack), or can be arranged on the outer side surface of the pole segment 111 (i.e. the side surface of the pole segment 111 facing away from the core pack), which is not limited in the embodiments of the present application.

[0161] The above is a general description of the current collector 100 according to the embodiments of the present application. The connection structure of the pole segment 111 and the pole 200 will be described below.

[0162] Please continue to refer to FIG. 16, which is a structural schematic diagram of the current collector shown in FIG. 15. The pole segment 111 is provided with a pole connection structure 1111 for electrically connecting with the pole 200, so as to realize the electrical connection between the pole segment 111 and the pole 200.

[0163] For example, the pole connection structure 1111 can include a pole mounting hole for mounting the pole 200 to electrically connect with the pole 200. In the assembly process, the pole 200 can be inserted into the pole mounting hole to realize the mounting.

[0164] In some embodiments, the pole segment 111 can further include a positioning hole 1112. The positioning hole 1112 is located between the pole connection structure 1111 and the tab segment 112. Correspondingly, other structures inside the battery (such as the cover to be explained later) can be provided with a positioning column which is inserted into the positioning hole 1112, so that the cooperation between the positioning hole 1112 and the positioning column can limit the rotation or movement of the current collector body 11 relative to the cover 300 of the battery.

[0165] In some embodiments, the reinforcing portion 12 at least partially surrounds the pole mounting hole and forms a positioning step 1113 surrounding the pole mounting hole. Thus, the positioning step 1113 can facilitate the quick and accurate positioning of the pole 200, so as to improve the production and assembly efficiency of the battery.

[0166] It can also be understood that the pole mounting hole can be a through hole or a blind hole, which is not limited in the embodiments of the present application.

[0167] In some embodiments, the pole post connecting structure 1111 can also be used to weld the pole post 200 with a structure such as friction welding, laser welding, ultrasonic welding, and the like, and the present application does not limit the same, as long as the structure is used to realize the connection between the pole post mounting portion and the pole post 200.

[0168] For example, please continue to refer to FIG. 17 and FIG. 18, FIG. 17 is a schematic diagram of the current collector forming a plurality of arc-shaped welding tracks, and FIG. 18 is a schematic diagram of the current collector forming a circular ring-shaped welding track. The pole post 200 can adopt a fusion welding process at the pole post mounting hole, thereby forming a closed circular welding track and also forming a plurality of arc-shaped welding tracks.

[0169] Continuing to refer to FIG. 16, it has been mentioned above that at least one side surface of the pole post segment 111 in the thickness direction is provided with the reinforcing portion 12. Then, the reinforcing portion 12 can be at least partially extended from the pole post connecting structure 1111 to the bending connection position between the pole post segment 111 and the tab segment 112.

[0170] Therefore, the strength of the part of the pole post segment 111 between the pole post connecting structure 1111 and the tab segment 112 can be improved by the reinforcing portion 12, so as to avoid bending deformation or even breakage of the part, thereby avoiding short circuit, open circuit, current overcurrent capacity reduction, and the like in the battery, and further improving the reliability and service life of the battery.

[0171] It can be understood that the reinforcing portion 12 is at least partially extended from the pole post connecting structure 1111 to the tab segment 112, which can be that the reinforcing portion 12 is only extended from the pole post connecting structure 1111 to the tab segment 112, and can also be that the reinforcing portion 12 is also partially extended to the side of the pole post connecting structure 1111 away from the tab segment 112. Wherein, the bending connection position between the pole post segment 111 and the tab segment 112 can be understood as the boundary line between the pole post segment 111 and the tab segment 112.

[0172] For example, the reinforcing portion 12 can be extended from the end of the pole post segment 111 close to the tab segment 112 (i.e. the boundary line between the pole post segment 111 and the tab segment 112) to the end of the pole post segment 111 away from the tab segment 112, thereby providing good reinforcement effect for each position of the pole post segment 111.

[0173] In some embodiments, the reinforcing portion 12 is made of an electrically conductive material, and the reinforcing portion 12 is electrically connected to the pole segment 111 and / or the tab segment 112. In this way, the reinforcing portion 12 and the pole segment 111 form an electrically conductive structure with a larger cross-sectional area in at least some regions, thereby improving the current carrying capacity of the pole segment 111 in these regions. In this way, it can be understood that the reinforcing portion 12 not only reinforces the pole segment 111 in terms of physical strength, but also reinforces the pole segment 111 in terms of current carrying capacity, thereby improving the performance of the battery. Of course, the overall surface area of the reinforcing portion 12 and the pole segment 111 is also larger than the surface area of the pole segment 111, for example, the overall surface area of the reinforcing portion 12 and the pole segment 111 in the thickness direction is larger, thereby improving the heat dissipation capacity of the pole segment 111 and the entire current collector 100.

[0174] The reinforcing portion 12 and the pole segment 111 can be connected in various ways. For example, the reinforcing portion 12 and the pole segment 111 can be integrally bent and formed, and the reinforcing portion 12 is connected to the side edges of the pole segment 111 at various positions between the pole connecting structure 1111 and the tab segment 112. Alternatively, the reinforcing portion 12 can be made of an electrically conductive material and attached to the pole segment 111, and the reinforcing portion 12 and the pole segment 111 are in electrical contact.

[0175] In some embodiments, the reinforcing portion 12 is integrally bent and formed with the current collector body 11.

[0176] Please continue to refer to FIG. 19, which is a second structure diagram of the reinforcing portion of the current collector shown in FIG. 15. In some embodiments, at least one side edge of the current collector body 11 in the width direction H2 is connected to the reinforcing portion 12, so that the reinforcing portion 12 is attached to at least one side surface of the pole segment 111 in the thickness direction H1.

[0177] The outer side of the connection between the reinforcing portion 12 and the current collector body 11 can be an arc surface structure, thereby avoiding the formation of a straight edge at the bent connection between the reinforcing portion 12 and the current collector body 11, thereby avoiding damage to the internal components of the battery, such as the insulating film.

[0178] In some embodiments, the current collector body 11 can include a first side edge 113 and a second side edge 114 arranged opposite to each other in the width direction H2. In this way, the reinforcing portion 12 can be connected only to the first side edge 113, the reinforcing portion 12 can also be connected only to the second side edge 114, the reinforcing portion 12 can also be partially connected to the first side edge 113 and partially connected to the second side edge 114, and the present application does not limit the embodiments in this regard.

[0179] For example, the reinforcing portion 12 can include a first reinforcing portion 12a and a second reinforcing portion 12b. The first reinforcing portion 12a is connected to the first side edge 113 by bending to be attached to the pole segment 111, and the second reinforcing portion 12b is connected to the second side edge 114 by bending to be attached to the pole segment 111.

[0180] The first reinforcing portion 12a and the second reinforcing portion 12b can be oppositely arranged along the width direction H2 of the current collector body 11. The first reinforcing portion 12a and the second reinforcing portion 12b can be located on the same side surface of the pole segment 111 in the thickness direction.

[0181] Then, in the actual production process, 180° bending can be performed from both sides of the width direction H2 of the current collector body 11 at the same time to form the first reinforcing portion 12a and the second reinforcing portion 12b, respectively.

[0182] In some embodiments, the gap between the first reinforcing portion 12a and the second reinforcing portion 12b can be greater than or equal to 0.2 millimeters. Therefore, it can also be understood that a margin is reserved between the first reinforcing portion 12a and the second reinforcing portion 12b to prevent the second reinforcing portion 12b and the second reinforcing portion 12b from interfering with each other when the first reinforcing portion 12a and the second reinforcing portion 12b are bent by the bending process, thereby improving the reliability and forming quality of the current collector body 11 after bending and forming.

[0183] For example, the gap C between the first reinforcing portion 12a and the second reinforcing portion 12b can be 0.2 millimeters, 0.21 millimeters, 0.224 millimeters, 0.237 millimeters, 0.245 millimeters, 0.25 millimeters, 0.27 millimeters, 0.3 millimeters, 0.35 millimeters, 0.391 millimeters, 0.4 millimeters, 0.423 millimeters, 0.45 millimeters, 0.5 millimeters, 0.571 millimeters, 0.64 millimeters, 0.689 millimeters, 0.7 millimeters, 0.721 millimeters, 0.753 millimeters, 0.8 millimeters, 0.849 millimeters, 0.9 millimeters, 0.914 millimeters, 0.95 millimeters, 0.974 millimeters, 0.99 millimeters, 1 millimeter, or 1.1 millimeters, and the like, without limitation in the embodiments of the present application.

[0184] In some embodiments, the gap C between the first reinforcing portion 12a and the second reinforcing portion 12b can be 0.5 to 1 millimeter. On the one hand, by reserving a gap between the first reinforcing portion 12a and the second reinforcing portion 12b greater than or equal to 0.5 millimeter, the first reinforcing portion 12a and the second reinforcing portion 12b can be prevented from interfering with each other due to errors in actual bending processing. On the other hand, by reserving a gap between the first reinforcing portion 12a and the second reinforcing portion 12b less than or equal to 1 millimeter, the first reinforcing portion 12a and the second reinforcing portion 12b can be made as large as possible, thereby improving the overall strength of the current collector 100 and improving the current carrying capacity.

[0185] In some embodiments, along the width direction H2 of the current collector body 11, the width of the current collector body 11 can be W1, the width of the first reinforcing portion 12a can be A, the gap between the first reinforcing portion 12a and the second reinforcing portion 12b can be C, and the width of the second reinforcing portion 12b can be B, then B = W - A - C. In addition, as mentioned above, the pole segment 111 can also be provided with a positioning hole 1112. Then the positioning hole 1112 can be located between the first reinforcing portion 12a and the second reinforcing portion 12b. Thus, the gap between the first reinforcing portion 12a and the second reinforcing portion 12b is fully utilized. Next, the structure of the tab segment 112 will be introduced first to further explain and illustrate the specific structure of the first reinforcing portion 12a and the second reinforcing portion 12b in combination with the structure of the tab segment 112.

[0186] Please continue to refer to FIG. 20 and FIG. 21, FIG. 20 is a second structure diagram of the tab segment of the current collector shown in FIG. 15, and FIG. 7 is a schematic diagram of the tab connection structure of the current collector shown in FIG. 6 being folded to the tab segment body. The tab segment 112 is provided with a tab connection structure 1121 for electrically connecting with the tab 51, so as to realize the electrical connection between the tab segment 112 and the tab 51.

[0187] For example, the tab segment 112 includes a tab segment body 1122 and a tab connection structure 1121. The tab segment body 1122 is connected with the pole segment 111, and the tab connection structure 1121 is bendably connected to the tab segment body 1122. The tab connection structure 1121 is used for welding and fixing with the tab 51. For example, the tab connection structure 1121 can be used for welding and fixing with the tab 51 by ultrasonic welding or laser welding.

[0188] Therefore, in the actual assembly process of the battery, the tab connecting structure 1121 can be first connected vertically to the tab segment body 1122 as shown in FIG. 6, so as to facilitate the welding of the tab connecting structure 1121 and the tab 51. After the tab connecting structure 1121 is welded and fixed to the tab 51, the tab connecting structure 1121 and the tab 51 are bent to adhere to the tab segment body 1122 as shown in FIG. 7, so that the structure inside the battery is more compact, thereby improving the energy density of the battery.

[0189] In some embodiments, the tab segment body 1122 and the tab connecting structure 1121 can be integrally bent and formed.

[0190] Therefore, under the condition that the thickness of the current collector 100 as a whole is constant, if a thicker single-layer plate is used to replace the current collector body 11 and the reinforcing portion 12, the thickness of the tab connecting structure 1121 will also be larger accordingly, which on the one hand leads to the tab connecting structure 1121 being too thick and not easy to bend to adhere flat to the tab segment 112, and on the other hand can also lead to a waste of more space inside the battery at the tab segment 112, thereby causing the energy density of the battery to decrease.

[0191] In order to facilitate the bending of the tab connecting structure 1121, the connection between the tab segment body 1122 and the tab connecting structure 1121 can be provided with a score groove. It can also be understood that the connection between the tab segment body 1122 and the tab connecting structure 1121 can be a circular arc transition, so as to avoid the formation of a straight edge at the bent connection between the tab segment body 1122 and the tab connecting structure 1121, thereby causing damage to the inside of the battery (such as the insulating film and the tab 51).

[0192] In some embodiments, the number of the tab connecting structure 1121 is at least one. At least one of the first side edge 113 and the second side edge 114 is connected with the tab connecting structure 1121. Correspondingly, the width ratio of the tab connecting structure 1121 to the first reinforcing portion 12a or the second reinforcing portion 12b connected to the same side edge of the current collector body 11 is 0.8-1.2, such as 0.8, 0.845, 0.9, 0.941, 0.954, 1, 1.054, 1.1, 1.16 or 1.2, which is not limited in the embodiments of the present application. Therefore, by making the width of the tab connecting structure 1121 substantially the same as that of the first reinforcing portion 12a or the second reinforcing portion 12b connected to the same side edge of the current collector body 11, the material utilization rate of the sheet metal raw material used for bending and forming the current collector 100 can be improved.

[0193] For example, the tab connecting structure 1121 can include a first tab connecting structure 1121a and a second tab connecting structure 1121b arranged opposite along the width direction H2 of the current collector body 11. The first tab connecting structure 1121a and the first reinforcing portion 12a are connected to the first side edge 113, and the width of the first tab connecting structure 1121a and the first reinforcing portion 12a is the same. The second tab connecting structure 1121b and the second reinforcing portion 12b are connected to the second side edge 114, and the width of the second tab connecting structure 1121b and the second reinforcing portion 12b is the same. Of course, the tab connecting structure 1121 can also include only one of the above-mentioned first tab connecting structure 1121a and second tab connecting structure 1121b, and the embodiments of the present application do not limit this.

[0194] Please continue to refer to FIG. 22, which is a schematic diagram of a structure in which the reinforcing portion of the current collector is folded to the inside of the current collector body. In some embodiments, the reinforcing portion 12 is connected to one of the first side edge 113 and the second side edge 114 along one side of the current collector body 11 in the width direction H2, and the other side of the reinforcing portion 12 is arranged adjacent to the other of the first side edge 113 and the second side edge 114 in the width direction H2 of the current collector body 11.

[0195] Therefore, in the actual bending forming process, the reinforcing portion 12 can be bent out from only one side of the current collector body 11 to cover each part in the width direction of the current collector body 11.

[0196] In some embodiments, the width of the reinforcing portion 12 is less than the width of the current collector body 11 along the width direction H2 of the current collector body 11.

[0197] In some embodiments, when the tab section 112 includes a tab section body 1122 and a tab connecting structure 1121. The tab connecting structure 1121 is connected to the first side edge 113, and the width of the tab connecting structure 1121 can be substantially the same as the width of the reinforcing portion 12. Thus, the material utilization rate of the sheet metal used for bending forming the current collector 100 can be improved.

[0198] Please continue to refer to FIG. 23, which is a schematic diagram of the structure of the current collector shown in FIG. 19. In some embodiments, the reinforcing portion 12 includes a connecting side edge 124 and a first free side edge 125 connected thereto. The connecting side edge 124 is connected to one side edge of the current collector body 11 in the width direction H2. The first free side edge 125 is arranged adjacent to the side edge of the pole section 111 away from the tab section 112. The first free side edge 125 is provided with a first avoidance structure 126, which is recessed from the side edge of the pole section 111 away from the tab section 112. Thus, the end of the first free side edge 125 away from the connecting side edge 124 can be limited to protrude outward from the current collector body 11 in the length direction.

[0199] Further, after the reinforcing portion 12 is bent to adhere to one side of the thickness direction of the pole segment 111, even if the reinforcing portion 12 is inclined at a certain angle toward the outside of the length direction of the current collector body 11 due to a processing error, the first empty structure 126 can avoid the one end of the first free side edge 125 protruding from the outside of the length direction of the current collector body 11 to form a sharp protrusion. Then, during the subsequent battery assembly process, the one end of the first free side edge 125 forming a sharp protrusion can be avoided to pierce other structures inside the battery (such as piercing an insulating film), thereby ultimately improving the reliability and service life of the battery. The first empty structure 126 can be a displacement groove, a chamfer, or a notch, and the present application does not limit the embodiments.

[0200] Please continue to refer to FIG. 24, which is a partial enlarged view of X in FIG. 23. In some embodiments, the one end of the pole segment 111 away from the tab segment 112 is arranged adjacent to the reinforcing portion 12 to form a first end of the current collector 100. At least one corner of the first end is provided with an empty notch 127. For example, after the reinforcing portion 12 is bent to adhere to one side of the thickness direction of the current collector body 11, the empty notch 127 can be punched out together with the reinforcing portion 12 by a punching process to avoid the connected part of the one end of the pole segment 111 away from the tab segment 112 and the one end of the reinforcing portion 12 away from the tab segment 112 forming a sharp corner. Then, during the subsequent battery assembly process, the one end of the free side edge 125 forming a sharp protrusion can be avoided to pierce other structures inside the battery (such as piercing an insulating film), thereby ultimately improving the reliability and service life of the battery.

[0201] Please continue to refer to FIG. 25, which is a third structural schematic diagram of the current collector shown in FIG. 15. The current collector body 11 can further include a holding segment 115. The holding segment 115 is connected to the one end of the tab segment 112 away from the pole segment 111. The holding segment 115 protrudes from the one side of the tab segment 112 away from the core package for clamping and fixing by external equipment. After the tab connecting structure 1121 is welded with the tab 51, the holding segment 115 can be clamped by external equipment first, and then the whole composed of the tab 51 and the tab connecting structure 1121 is bent to fold on the tab segment 112. Further, by arranging the holding segment 115, the bending precision of the tab connecting structure 1121 and the tab 51 can be improved.

[0202] Please refer to FIG. 26 and FIG. 27, FIG. 26 is a structural schematic diagram three of the current collector cooperating with the tab and the pole provided by the embodiments of the present application, and FIG. 27 is a schematic diagram of the current collector and the tab after being bent. The present application provides a current collector 100. The current collector 100 can include a current collector body 11 and a reinforcing portion 12.

[0203] The current collector body 11 comprises a pole segment 111, a tab segment 112, and a holding segment 115. The pole segment 111 is used to be electrically connected with the pole 200. The tab segment 112 comprises a tab segment body 1122 and a tab connecting structure 1121. The tab segment body 1122 is connected with the pole segment 111. The tab connecting structure 1121 is bendably connected with the tab segment body 1122 and is used to be electrically connected with the tab 51 of the core pack. The holding segment 115 protrudes from the side of the tab segment body 1122 away from the core pack, so as to be clamped and fixed by external equipment. Then, in the actual assembly process, the tab connecting structure 1121 can be vertically connected with the tab segment body 1122 first, as shown in FIG. 26, so as to facilitate the tab connecting structure 1121 to stand up and be welded with the tab 51. After the tab connecting structure 1121 is welded and fixed with the tab 51, the tab connecting structure 1121 and the tab 51 are bent to be attached to the tab segment body 1122, as shown in FIG. 2, so that the structure inside the battery is more compact, thereby improving the energy density of the battery. In the process of bending the tab connecting structure 1121 and the tab 51, the holding segment 115 can be clamped by external equipment, so that the stress of the current collector 100 in the process of bending the tab connecting structure 1121 and the tab 51 is transferred to the external equipment, thereby avoiding that the current collector 100 crushes the core pack.

[0204] The reinforcing part 12 is at least partially arranged on one side surface of the holding segment 115 in the thickness direction H1, so that the strength of the holding segment 115 can be improved, thereby avoiding that the holding segment 115 is deformed in the process of bending the tab connecting structure 1121 and the tab 51, and the current collector 100 crushes the core pack.

[0205] It can be understood that the reinforcing part 12 being at least partially arranged on one side surface of the holding segment 115 in the thickness direction H1 can be that the reinforcing part 12 is only arranged on one side surface of the holding segment 115 in the thickness direction H1, or the reinforcing part 12 can be arranged on both side surfaces of the holding segment 115 in the thickness direction H1, and the embodiments of the present application do not limit this. When the reinforcing part 12 is only arranged on one side surface of the holding segment 115 in the thickness direction, the reinforcing part 12 can be arranged on the inner side surface of the holding segment 115 (i.e. the side surface of the holding segment 115 facing the core pack), or the reinforcing part 12 can be arranged on the outer side surface of the holding segment 115 (i.e. the side surface of the holding segment 115 away from the core pack), and the embodiments of the present application do not limit this.

[0206] The above is the overall illustration of the current collector 100 of the embodiments of the present application. The reinforcing part 12 will be illustrated below in connection with the connection structure of the pole segment 111 and the pole 200.

[0207] Please continue to refer to FIG. 28, which is a structural schematic diagram of the current collector shown in FIG. 26. The pole column segment 111 is provided with a pole column connecting structure 1111 for electrically connecting with the pole column 200, so that the pole column segment 111 and the pole column 200 can be electrically connected. For example, the pole column connecting structure 1111 can include a pole column mounting hole for mounting the pole column 200 to electrically connect with the pole column 200. In the process of assembly, the pole column 200 can be mounted by being inserted into the pole column mounting hole.

[0208] In some embodiments, the pole column segment 111 can further include a positioning hole 1112. The positioning hole 1112 is located between the pole column connecting structure 1111 and the tab segment 112. Correspondingly, other structures inside the battery (such as a cover to be explained later) can be provided with a positioning column which is inserted into the positioning hole 1112, so that the cooperation between the positioning hole 1112 and the positioning column can limit the rotation or movement of the current collector body 11 relative to the cover 300 of the battery.

[0209] It can also be understood that the pole column mounting hole can be a through hole or a blind hole, and the embodiments of the present application do not limit this.

[0210] In some embodiments, the pole column connecting structure 1111 can also be used for welding structures such as friction welding, laser welding, ultrasonic welding with the pole column 200, and the embodiments of the present application do not limit this. As long as the structure is used to realize the connection between the pole column 200 mounting part and the pole column 200, it is within the protection scope of the pole column connecting structure 1111 of the present application.

[0211] For example, please continue to refer to FIG. 29 and FIG. 30, FIG. 29 is a schematic diagram of the current collector shown in FIG. 26 forming a plurality of arc-shaped welding trajectories, and FIG. 5 is a schematic diagram of the current collector shown in FIG. 1 forming a circular ring-shaped welding trajectory. The pole column 200 can be welded by a fusion welding process at the pole column mounting hole, so as to form a closed circular welding trajectory and also begin to form a plurality of arc-shaped welding trajectories.

[0212] Next, the technical solutions of the embodiments of the present application will be illustrated by continuing to combine the tab segment 112. Please continue to refer to FIG. 28, the tab segment 112 can be connected to the pole column segment 111 by being bent. Of course, the tab segment 112 can also be connected to the pole column segment 111 by being straight, that is, the tab segment 112 can also be located in the same plane as the pole column segment 111, and the embodiments of the present application do not limit this.

[0213] In some embodiments, each tab connecting structure 1121 is provided with a welding area for welding with the tab 51. Along the width direction H2 of the current collector body 11, the difference between the width of at least one tab segment 112 and the width of the welding area thereof is greater than or equal to 2 mm. Further, in the process of welding the tab connecting structure 1121 with the tab 51, the external tooling equipment can fix the tab connecting structure 1121 through the position where the tab segment 112 is not provided with the welding area, so as to improve the welding quality of the tab connecting structure 1121 with the tab 51, thereby improving the reliability and service life of the battery.

[0214] For example, the difference between the width of each tab segment 112 and the width of the welding area thereof can be 2 mm, 2.2 mm, 2.45 mm, 2.5 mm, 2.7 mm, 2.98 mm, 3 mm, 3.4 mm, 3.95 mm or 4 mm, which is not limited in the embodiments of the present application.

[0215] In some embodiments, the tab segment body 1122 and the tab connecting structure 1121 can be integrally bent and formed.

[0216] In order to facilitate bending the tab connecting structure 1121 in the process of producing and assembling the battery, the connection between the tab segment body 1122 and the tab connecting structure 1121 can be provided with a score groove.

[0217] It can also be understood that the connection between the tab segment body 1122 and the tab connecting structure 1121 can be a circular arc transition, so as to avoid the bending connection between the tab segment body 1122 and the tab connecting structure 1121 forming a straight edge, thereby causing damage to the inside of the battery (such as the insulating film and the tab 51).

[0218] Next, the technical solutions of the embodiments of the present application will be illustrated in combination with the reinforcing portion 12. In some embodiments, the reinforcing portion 12 is integrally bent and formed with the current collector body 11. Therefore, in the actual processing process, the current collector body 11 and the reinforcing portion 12 can be directly formed by the bending process of the sheet metal raw material. Thus, the reinforcing portion 12 is not cut off by the blanking process in the forming process, thereby simplifying the manufacturing process of the current collector 100 and improving the material utilization rate of the sheet metal raw material.

[0219] For example, the reinforcing portion 12 can be bent and connected with the holding segment 115 to at least adhere to one side surface of the holding segment 115 in the thickness direction H1. It can also be understood that the connection between the reinforcing portion 12 and the current collector body 11 can be an arc surface, so as to avoid the bending connection between the reinforcing portion 12 and the current collector body 11 forming a straight edge, thereby causing damage to the inside of the battery (such as the insulating film).

[0220] In some embodiments, at least one side edge of the current collector body 11 in the width direction is connected to the reinforcing portion 12 by bending, so that the reinforcing portion 12 is attached to at least one side surface of the current collector body 11 in the thickness direction.

[0221] Please refer to FIG. 31, which is a schematic diagram of the structure of the reinforcing portion arranged inside the current collector body in the current collector shown in FIG. 26. The current collector body 11 can include a first side edge 113 and a second side edge 114 arranged oppositely in the width direction H2. Then, the reinforcing portion 12 can be connected to only the first side edge 113, the reinforcing portion 12 can also be connected to only the second side edge 114, the reinforcing portion 12 can also be connected to the first side edge 113 partially and to the second side edge 114 partially, and the embodiments of the present application do not limit this.

[0222] For example, the reinforcing portion 12 can include a first reinforcing portion 12a and a second reinforcing portion 12b. The first reinforcing portion 12a is connected to the first side edge 113 by bending, and the second reinforcing portion 12b is connected to the second side edge 114 by bending.

[0223] The first reinforcing portion 12a and the second reinforcing portion 12b can be arranged at intervals in the width direction H2 of the current collector body 11. The first reinforcing portion 12a and the second reinforcing portion 12b can also be located on the same side surface in the thickness direction of the current collector body 11. Then, in the actual production process, 180° bending can be performed simultaneously from both sides of the current collector body 11 in the width direction H2 to form the first reinforcing portion 12a and the second reinforcing portion 12b, respectively.

[0224] In some embodiments, the gap between the first reinforcing portion 12a and the second reinforcing portion 12b can be greater than or equal to 0.2 mm. Therefore, it can also be understood that a margin is reserved between the first reinforcing portion 12a and the second reinforcing portion 12b to prevent the second reinforcing portion 12b and the second reinforcing portion 12b from interfering with each other when the first reinforcing portion 12a and the second reinforcing portion 12b are bent by the bending process, thereby improving the reliability and forming quality of the current collector body 11 after bending and forming.

[0225] For example, the gap between the first reinforcing portion 12a and the second reinforcing portion 12b is C, which can be 0.2 mm, 0.21 mm, 0.224 mm, 0.237 mm, 0.245 mm, 0.25 mm, 0.27 mm, 0.3 mm, 0.35 mm, 0.391 mm, 0.4 mm, 0.423 mm, 0.45 mm, 0.5 mm, 0.571 mm, 0.64 mm, 0.689 mm, 0.7 mm, 0.721 mm, 0.753 mm, 0.8 mm, 0.849 mm, 0.9 mm, 0.914 mm, 0.95 mm, 0.974 mm, 0.99 mm, 1 mm, or 1.1 mm, etc., which are not limited in the embodiments of the present application.

[0226] In some embodiments, the gap C between the first reinforcing portion 12a and the second reinforcing portion 12b can be 0.5-1 mm. On the one hand, by reserving a gap between the first reinforcing portion 12a and the second reinforcing portion 12b greater than or equal to 0.5 mm, the first reinforcing portion 12a and the second reinforcing portion 12b can be prevented from interfering with each other due to the error of actual bending processing. On the other hand, by reserving a gap between the first reinforcing portion 12a and the second reinforcing portion 12b less than or equal to 1 mm, the first reinforcing portion 12a and the second reinforcing portion 12b can be made as large as possible, thereby improving the strength of the current collector 100 as a whole and improving the current overcurrent capacity.

[0227] In some embodiments, along the width direction of the current collector body 11, the width of the current collector body 11 can be W1, the width of the first reinforcing portion 12a can be A, the gap between the first reinforcing portion 12a and the second reinforcing portion 12b can be C, and the width of the second reinforcing portion 12b can be B, then B = W - A - C.

[0228] Please continue to refer to FIG. 32, which is a second structure diagram of the tab section of the current collector shown in FIG. 26. In some embodiments, the number of the tab connecting structures 1121 is at least one. At least one of the first side edge 113 and the second side edge 114 is connected with the tab connecting structure 1121.

[0229] Correspondingly, the width ratio of the tab connecting structure 1121 to the first reinforcing portion 12a or the second reinforcing portion 12b connected to the same side edge of the current collector body 11 is 0.8-1.2, such as 0.8, 0.845, 0.9, 0.941, 0.954, 1, 1.054, 1.1, 1.16, or 1.2, which are not limited in the embodiments of the present application. Thus, by making the width of the tab connecting structure 1121 and the first reinforcing portion 12a or the second reinforcing portion 12b connected to the same side edge of the current collector body 11 substantially the same, the material utilization rate of the sheet metal raw material used for bending the current collector 100 can be improved.

[0230] For example, the tab connecting structure 1121 can include a first tab connecting structure 1121a and a second tab connecting structure 1121b arranged opposite to each other along the width direction of the current collector body 11. The first tab connecting structure 1121a and the first reinforcing portion 12a are connected to the first side edge 113, and the width of the first tab connecting structure 1121a and the first reinforcing portion 12a is the same. The second tab connecting structure 1121b and the second reinforcing portion 12b are connected to the second side edge 114, and the width of the second tab connecting structure 1121b and the second reinforcing portion 12b is the same. Of course, the tab connecting structure 1121 can also include only one of the first tab connecting structure 1121a and the second tab connecting structure 1121b described above, and the embodiments of the present application do not limit this.

[0231] Optionally, the reinforcing portion 12 is connected to one of the first side edge 113 and the second side edge 114 along one side of the current collector body 11 in the width direction H2, and the other of the first side edge 113 and the second side edge 114 is arranged adjacent to the other side of the current collector body 11 in the width direction H2. In the actual bending forming process, only the reinforcing portion 12 is bent from one side of the current collector body 11 to cover each part in the width direction H2 of the current collector body 11.

[0232] In some embodiments, along the width direction H2 of the current collector body 11, the width of the reinforcing portion 12 is smaller than the width of the current collector body 11.

[0233] In some embodiments, along the width direction H2 of the current collector body 11, the width of the tab connecting structure 1121 can be the same as the width of the reinforcing portion 12. Thus, the material utilization rate of the sheet metal used for bending forming the current collector 100 can be improved.

[0234] Please continue to refer to FIG. 33, which is an enlarged view of X in FIG. 28. In some embodiments, the reinforcing portion 12 includes a connected side edge 124 and a second free side edge 125. The connected side edge 124 is connected to one side edge of the current collector body 11 in the width direction H2. The second free side edge 125 is disposed adjacent to one side edge of the holding section 115 away from the tab section 112. The second free side edge 125 is provided with a first clearance structure 126 at an end away from the connected side edge 124, and the first clearance structure 126 is recessed from the one side edge of the holding section 115 away from the tab section 112. Thus, the end of the second free side edge 125 away from the connected side edge 124 can be prevented from protruding outward in the length direction of the current collector body 11. After the reinforcing portion 12 is bent to adhere to one side of the current collector body 11 in the thickness direction H1, even if the reinforcing portion 12 is tilted at an angle outward in the length direction of the current collector body 11 due to a processing error, the first clearance structure 126 can prevent the end of the second free side edge 125 away from the connected side edge 124 from protruding outward in the length direction of the current collector body 11 to form a sharp protrusion. Thus, during subsequent battery assembly, the end of the second free side edge 125 away from the connected side edge 124 can be prevented from forming a sharp protrusion to pierce other structures inside the battery (such as puncturing an insulating film), thereby improving the reliability and service life of the battery. The first clearance structure 126 can be a clearance groove, a chamfer, or a notch, and the present application is not limited in this regard.

[0235] In some embodiments, the end of the holding section 115 away from the tab section 112 is disposed adjacent to the reinforcing portion 12 to form a second end portion of the current collector 100. At least one corner of the second end portion is provided with a clearance notch 127. For example, after the reinforcing portion 12 is bent to adhere to one side of the current collector body 11 in the thickness direction H1, the holding section 115 and the reinforcing portion 12 can be punched together to form the clearance notch 127 by a punching process to avoid the formation of a sharp corner at the connection between the end of the holding section 115 away from the tab section 112 and the end of the reinforcing portion 12 away from the tab section 112. Thus, during subsequent battery assembly, the end of the second free side edge 125 near the connected side edge 124 can be prevented from forming a sharp protrusion to pierce other structures inside the battery (such as puncturing an insulating film), thereby improving the reliability and service life of the battery.

[0236] In some embodiments, the reinforcing portion 12 and the tab connecting structure 1121 are spaced apart. In this way, on the one hand, in the actual production process of the battery, the reinforcing portion 12 can be first bent to be attached to the holding section 115, and the tab connecting structure 1121 can be bent to be perpendicular to the tab section 112. At this time, since the reinforcing portion 12 and the tab connecting structure 1121 are spaced apart, the reinforcing portion 12 and the tab connecting structure 1121 can be more conveniently and accurately bent to different angles. On the other hand, when the tab connecting structure 1121 needs to be folded to the tab section 112 after being welded with the tab 51, even if the position accuracy of the bending of the tab section 112 has a certain deviation, the reinforcing portion 12 and the tab connecting structure 1121 are also less likely to interfere with each other when the tab section 112 is inclined towards the reinforcing portion 12.

[0237] For example, when the reinforcing portion 12 includes a first reinforcing portion 12a and a second reinforcing portion 12b that are oppositely arranged along the width direction H2 of the current collector body 11. The first reinforcing portion 12a is connected with the first side edge 113, and the second reinforcing portion 12b is connected with the second side edge 114.

[0238] In this way, the first reinforcing portion 12a and the tab connecting structure 1121 can be both bent from the first side edge 113. In addition, the first reinforcing portion 12a and the tab connecting structure 1121 are spaced apart along the length direction of the current collector body 11.

[0239] In some embodiments, the reinforcing portion 12 extends from at least one end of the holding section 115 away from the tab section 112 to the bending connection position of the holding section 115 and the tab section 112. In this way, the reinforcing portion 12 can provide a reinforcing effect to more positions of the holding section 115, and the material utilization rate of the sheet metal material can also be improved. The bending connection position of the holding section 115 and the tab section 112 can be understood as the boundary line of the holding section 115 and the tab section 112.

[0240] The above is some examples of the current collector 100 of the embodiments of the present application.

[0241] Please continue to refer to FIG. 34, which is a structural schematic diagram of a top cover assembly provided by the embodiments of the present application. The embodiments of the present application also provide a top cover assembly. The top cover assembly can include a cover body 300, a current collector 100, and a pole 200. The current collector 100 is the current collector 100 as described above. The current collector 100 is installed on the cover body 300. The pole 200 is installed on the cover body 300 and electrically connected with the pole section 111.

[0242] Please continue to refer to FIG. 35, which is a diagram showing the dimension parameters of the top cover assembly shown in FIG. 34. In some embodiments, along the length direction of the pole post segment 111. The distance between the center of the area where the pole post segment 111 is used to mount the pole post 200 and the pole lug segment 112 is L2 (of course, it can also be understood that the distance between the center of the pole post 200 or the pole post connecting structure 1111 and the pole lug segment 112 is L2). The length of the cover body 300 is L1. L2≤(L1) / 3. Thus, the distance between the pole post connecting structure 1111 and the pole lug segment 112 is small, which can reduce the resistance of the portion of the current collector 100 between the pole post connecting structure 1111 and the pole lug segment 112, and finally improve the overcurrent capacity of the current collector 100.

[0243] For example, L2 can be equal to (L1) / 3, (L1) / 4, (L1) / 5, (L1) / 6, (L1) / 7, or (L1) / 8, which is not limited in the embodiments of the present application.

[0244] In some embodiments, 5mm≤L2. For example, L2 can be 5mm, 5.7mm, 6mm, 6.5mm, 6.95mm, 7mm, 8mm, 9.5mm, or 10mm, etc., which is not limited in the embodiments of the present application. Thus, there is enough gap between the pole post connecting structure 1111 and the end of the cover body 300 to set the parts for positioning and fastening, so as to realize the mounting and fixing of the pole post segment 111. For example, the pole post segment 111 can be provided with the positioning hole 1112 described above. The positioning hole 1112 is located between the pole post connecting structure 1111 and the pole lug segment 112. Correspondingly, the cover body 300 can be provided with a positioning column which is inserted into the positioning hole 1112, so as to realize the connection and fixing of the cover body 300 and the current collector 100.

[0245] The above is some examples of the top cover assembly of the embodiments of the present application.

[0246] The embodiments of the present application also provide a battery, which can include the top cover assembly as described above. For example, please continue to refer to FIG. 36 and FIG. 37, FIG. 36 is a structural diagram of a battery provided by the embodiments of the present application, and FIG. 37 is a sectional view of the battery shown in FIG. 36 along the P-P direction. The battery can include a shell 400, a core package 500, and a top cover assembly. The shell 400 is provided with a mounting cavity, and the core package 500 is arranged in the mounting cavity. The core package 500 is provided with a pole lug 51. The cover body 300 of the top cover assembly is connected to the shell 400 to close the mounting cavity. The pole lug segment 112 of the current collector 100 of the top cover assembly is electrically connected to the pole lug 51 of the core package 500. Thus, the top cover assembly can supply power to external devices through the pole post 200.

[0247] In some embodiments, the battery can further include an insulating film 600 wrapping the tab section 112 and the core package 500, for insulating the shell 400 from the tab section 112 and the core package 500 respectively, so as to reduce the risk of internal short circuit of the battery.

[0248] In some embodiments, along the width direction H3 of the current collector body 11, the ratio of the width of the current collector body 11 to the width of the shell 400 is less than or equal to 0.9. Alternatively, it can also be said that, along the width direction H3 of the current collector body 11, the width of the current collector body 11 is W, and the width of the battery is W0. Wherein, W / (W0)≤0.9. Thus, it can be ensured that there is enough gap between the current collector 100 and the inner wall of the shell 400 to avoid damage to the shell 400 inner wall or the insulating film 600 caused by the current collector 100, so as to improve the reliability and service life of the battery. For example, the ratio of the width of the current collector body 11 to the width of the shell 400 along the width direction H3 of the current collector body 11 can be 0.9, 0.87, 0.812, 0.8, 0.75, 0.742, 0.7, 0.69, 0.655, 0.6 or 0.5, etc. The present application does not limit this.

[0249] In some embodiments, the thickness direction H2 of the tab section 112 is the same as the length direction of the battery, and the ratio of the thickness of the current collector 100 to the length of the battery is 0.0025-0.05. For example, the ratio of the thickness of the current collector 100 to the length of the battery is 0.0025, 0.0028, 0.005, 0.0089, 0.01, 0.014, 0.019, 0.02, 0.025, 0.03, 0.037, 0.0396, 0.045, 0.0487 or 0.05, etc. The present application does not limit this. Thus, it can not only avoid the problem of insufficient strength and / or insufficient current-carrying capacity of the current collector 100 due to being too thin, but also make the current collector 100 thinner, so that the current collector 100 occupies less space in the shell 400, and thus a larger core package 500 can be arranged in the shell 400, so as to improve the energy density of the battery.

[0250] In some embodiments, the ratio of the thickness of the current collector 100 to the length of the battery can be 0.0025-0.05, so as to avoid the problem of insufficient strength and / or insufficient current-carrying capacity of the current collector 100 due to being too thin.

[0251] In some embodiments, the tab connecting structure 1121 can be located at a middle position of the core pack 500 along the height direction of the battery (or the length direction of the tab segment 112). For example, please continue to refer to FIG. 38, which is a schematic diagram of the size parameters of the current collector of the battery shown in FIG. 37. When the tab segment 112 includes the tab connecting structure 1121, the thickness direction H2 of the tab segment 112 is perpendicular to the height direction of the battery. Then, along the height direction of the battery (or the length direction of the tab segment 112), the total height of the tab connecting structure 1121 is h1, the distance between the tab connecting structure 1121 and the tab segment 111 is h2, and the total height of the battery is H. Herein, h2≤(H-5) / 2-h1.

[0252] In some embodiments, along the height direction of the battery (or the length direction of the tab segment 112), the center line of the tab connecting structure 1121 can coincide with the center line of the tab 51. For example, along the height direction of the battery (or the length direction of the tab segment 112), the total height of the tab connecting structure 1121 is h1, and the distance between the tab connecting structure 1121 and the tab segment 111 is h2, wherein h2+h1 / 2 is the position of the center line of the tab 51.

[0253] In some embodiments, h2+h1 / 2 is 25-100 mm. For example, h2+h1 / 2 is 25 mm, 29 mm, 30 mm, 34.1 mm, 42.4 mm, 50 mm, 51.7 mm, 55 mm, 62.7 mm, 65.55 mm, 72 mm, 80.43 mm, 85 mm, 90 mm, 91.4 mm, 94.5 mm, 95 mm, or 100 mm, which are not limited in the embodiments of the present application. On the one hand, it can avoid the tab segment 112 being too short, so that the tab connecting structure 1121 of the tab segment 112 can have more area to be welded with the tab 51, thereby improving the welding reliability of the tab segment 112 and the tab 51. On the other hand, it can also avoid the tab segment 112 being too long, so that the resistance from the tab connecting structure 1121 to the tab connecting structure 1111 is too large, thereby improving the performance of the current collector 100 and the battery.

[0254] The above are some examples of the battery in the embodiments of the present application.

[0255] The embodiments of the present application further provide a power-using device, which can include the battery as described above. The power-using device can be, but is not limited to, a vehicle, a smart wearable device, a mobile terminal, a household appliance, and a medical instrument, and the embodiments of the present application do not limit the same. The vehicle includes, but is not limited to, a car, a bus, a train, a ship, a flying device, and the like. The smart wearable device includes, but is not limited to, a smart watch, a smart bracelet, a cervical vertebra massage instrument, and the like. The mobile terminal includes, but is not limited to, a smart phone, a notebook computer, a tablet computer, a POS (point of sales terminal) machine. The household appliance includes, but is not limited to, a television, a washing machine, an air conditioner, an electric rice cooker, a smart sweeper, a smart lamp, and the like. The medical instrument includes, but is not limited to, an infrared electronic thermometer, a pulse oximeter, a human body composition analyzer, and the like.

Claims

1. A current collector (100), the current collector (100) comprising a current collector body (11) and a reinforcing portion (12), the current collector body (11) being configured to electrically connect with a pole and a tab, and the reinforcing portion (12) being arranged on the current collector body (11).

2. A current collector (100) according to claim 1, wherein The current collector body (11) comprises a pole segment (111) and a tab segment (112) connected by bending, the pole segment (111) being configured to electrically connect with a pole, and the tab segment (112) being configured to electrically connect with a tab; and The reinforcing portion (12) is arranged at least partially on one side surface of the pole segment (111) in the thickness direction, and the reinforcing portion (12) is arranged at least partially on one side surface of the tab segment (112) in the thickness direction.

3. The current collector (100) according to claim 2, wherein The pole segment (111) is provided with a pole connecting structure (1111) for electrically connecting with the pole, and the tab segment (112) is provided with a tab connecting structure (1121) for electrically connecting with the tab; The reinforcing portion extends from the pole connecting structure (1111) through the bending connection between the pole segment (111) and the tab segment (112) to the tab connecting structure (1121). 4.The current collector (100) of claim 3, wherein the reinforcing portion (12) is made of an electrically conductive material, and the reinforcing portion comprises a first reinforcing portion (121) and a second reinforcing portion (122) connected by bending, the first reinforcing portion (121) being in electrical conduction with the pole segment (111), and the second reinforcing portion (122) being in electrical conduction with the tab segment (112). 5.The current collector (100) of claim 3, wherein the reinforcing portion (12) is made of an electrically conductive material, and a portion of the reinforcing portion (12) between the pole connecting structure (1111) and the tab connecting structure (1121) is attached to the current collector body. 6.The current collector (100) of claim 2, wherein the pole segment (111) comprises a pole mounting hole for mounting the pole to electrically connect with the pole, and the reinforcing portion (12) is arranged at least partially around the pole mounting hole and is formed with a positioning step arranged around the pole mounting hole. 7.The current collector (100) of claim 2, wherein the tab segment (112) comprises a tab segment body (1122) and a tab connecting structure (1121), the tab segment body (1122) is connected with the pole segment (111), and the tab connecting structure (1121) is bendably connected to the tab segment body (1122), and the tab connecting structure (1121) is configured to be welded and fixed with the tab; wherein One side surface of the tab segment body (1122) in the thickness direction comprises a first area and a second area, the reinforcing portion is attached to the first area, and the tab connecting structure (1121) can be bent to be attached to the second area.

8. The current collector (100) according to claim 2, wherein the tab section comprises a tab section body (1122) connected to the pole section (111) and a tab connecting structure (1121) bendably connected to the tab section body (1122), the tab connecting structure (1121) being used for welding fixation with the tab. wherein, The ratio of the width of the tab section body (1122) to the width of the pole section (111) is 0.8-1.2 along the width direction of the current collector body (11).

9. The current collector (100) according to any one of claims 2-8, wherein at least one side edge of the current collector body (11) along the width direction is connected to the reinforcing portion (12) by bending, so that the reinforcing portion (12) is attached to at least one side surface of the current collector body (11) along the thickness direction.

10. The current collector (100) according to claim 9, wherein the current collector body (11) comprises a first side edge (113) and a second side edge (114) oppositely arranged along the width direction; The reinforcing portion comprises a first portion (12a) and a second portion (12b) oppositely arranged along the width direction of the current collector body (11), the first portion (12a) is connected to the first side edge (113) by bending, the second portion (12b) is connected to the second side edge by bending, and the first portion (12a) and the second portion (12b) are located on the same side surface of the current collector body along the thickness direction.

11. The current collector (100) according to claim 10, wherein the first portion (12a) and the second portion (12b) are spaced apart along the width direction of the current collector body (11), and the gap between the first portion (12a) and the second portion (12b) is greater than or equal to 0.2 mm.

12. The current collector (100) according to claim 10, wherein when the tab section (112) comprises a tab section body (1122) and a tab connecting structure (1121), the number of the tab connecting structures (1121) is at least one, at least one of the first side edge (113) and the second side edge (114) is connected to the tab connecting structure (1121), and the ratio of the width of the tab connecting structure (1121) to the width of the first portion (12a) or the second portion (12b) connected to the same side edge of the current collector body (11) is 0.8-1.

2.

13. The current collector (100) according to claim 10, wherein the pole section (111) is further provided with a positioning hole (1112), and the positioning hole (1112) is at least partially located between the first portion (12a) and the second portion (12b).

14. The current collector (100) according to claim 9, wherein the current collector body (11) comprises a first side edge (113) and a second side edge (114) oppositely arranged along the width direction. The reinforcing portion comprises a third portion (12c) connected to one of the first side edge (113) and the second side edge (114) along one side of the width direction of the current collector body (11), and the other of the first side edge (113) and the second side edge (114) is arranged adjacent to the third portion along the other side of the width direction of the current collector body (11).

15. The current collector (100) according to claim 9, wherein the reinforcing portion comprises a connected side edge (124) and a free side edge (125), the connected side edge (124) is connected to one side edge of the width direction of the current collector body (11), the free side edge (125) is arranged adjacent to one side edge of the length direction of the current collector body (11), and the free side edge (125) is provided with a clearance structure, and the clearance structure (126) is recessed from the side edge of the current collector body (11) adjacent to the clearance structure (126).

16. The current collector (100) according to claim 15, wherein the free side edge (125) comprises a first free side edge (1251) arranged adjacent to one side edge of the pole segment (111) away from the tab segment (112), and the clearance structure comprises a first clearance structure arranged on the first free side edge (1251); and / or, the free side edge comprises a second free side edge (1252) arranged adjacent to one side edge of the tab segment (112) away from the pole segment (111), and the clearance structure comprises a second clearance structure arranged on the second free side edge (1252).

17. The current collector (100) according to claim 9, wherein the reinforcing portion (12) comprises a connected side edge (124) and a free side edge (125), the connected side edge (124) is connected to one side edge of the width direction of the current collector body (11), the free side edge (125) is arranged adjacent to one side edge of the length direction of the current collector body (11) to form one end of the current collector in the length direction, and the free side edge (125) is provided with a clearance gap (127) at at least one corner of the end of the free side edge (125).

18. The current collector (100) according to claim 9, wherein the outer side of the connection between the current collector body (11) and the reinforcing portion (12) is an arc surface structure.

19. The current collector (100) according to any one of claims 2 to 8, wherein the current collector body further comprises a holding segment (115) connected to one end of the tab segment away from the pole segment, the holding segment (115) is protrudingly connected to one side of the tab segment (112) away from the core pack for clamping and fixing by external instruments; wherein, the reinforcing portion further comprises a third reinforcing portion (123) arranged on at least one side surface of the thickness direction of the holding segment (115).

20. The current collector (100) of claim 19, wherein the third reinforcing portion (123) comprises a connected side edge (124) and a second free side edge (1252), the connected side edge is connected with one side edge of the holding section along the width direction of the current collector body, the second free side edge (1252) is arranged adjacent to one side edge of the holding section (115) facing away from the tab section (112), and one end of the second free side edge (1252) facing away from the connected side edge (124) is provided with a second clearance structure, the second clearance structure is recessed to the one side edge of the holding section (115) facing away from the tab section (112).

21. The current collector (100) of claim 19, wherein, The third reinforcing portion extends from one end of the holding section facing away from the tab section to the bending connection position of the holding section and the tab section.

22. A current collector (100) as claimed in claim 1, wherein, The current collector body (11) comprises a tab section (112) and a pole section (111) connected by bending, the tab section (112) is used for electrical connection with the tab of the core package, the pole section (111) is provided with a pole connecting structure (1111) used for electrical connection with the pole, and The reinforcing portion (12) is arranged at least partially on one side surface of the pole section (111) in the thickness direction, and the reinforcing portion (12) extends at least partially from the pole connecting structure (1111) to the bending connection position of the pole section and the tab section (112).

23. The current collector (100) of claim 22, wherein the reinforcing portion (12) is made of conductive material, and the reinforcing portion (12) is electrically conductive with the pole section (111) and / or the tab section (112).

24. The current collector (100) of claim 23, wherein the reinforcing portion (12) is attached to the current collector body (11).

25. The current collector (100) of claim 22, wherein the pole section (111) comprises a pole mounting hole used for mounting the pole, and the reinforcing portion (12) is arranged at least partially around the pole mounting hole and is formed with a positioning step arranged around the pole mounting hole.

26. The current collector (100) of any one of claims 22 to 25, wherein at least one side edge of the current collector body (11) in the width direction is connected with the reinforcing portion (12) by bending, so that the reinforcing portion (12) is attached at least to one side surface of the pole section (11) in the thickness direction.

27. The current collector (100) of claim 26, wherein the current collector body comprises a first side edge (113) and a second side edge (114) arranged oppositely along the width direction; The reinforcing portion comprises a first reinforcing portion (12a) and a second reinforcing portion (12b), the first reinforcing portion (12a) is connected with the first side edge (113) by bending to be attached to the pole section (112), and the second reinforcing portion (12b) is connected with the second side edge (114) by bending to be attached to the pole section (112).

28. The current collector (100) according to claim 27, wherein the first reinforcing portion (12a) and the second reinforcing portion (12b) are spaced apart along a width direction of the current collector body (11), and a gap between the first reinforcing portion (12a) and the second reinforcing portion (12b) is greater than or equal to 0.2 mm.

29. The current collector (100) according to claim 27, wherein the tab section (112) comprises a tab section body (1122) connected to the tab section (111) and a tab connecting structure (1121) bendably connected to the tab section body (1122) and used for welding fixation of the tab. wherein The number of the tab connecting structure (1121) is at least one, and the tab connecting structure (1121) is connected to at least one of the first side edge (113) and the second side edge (114). The width ratio of the tab connecting structure (1121) to the first reinforcing portion (12a) or the second reinforcing portion (12b) connected to the same side edge of the current collector body (11) is 0.8-1.

2.

30. The current collector (100) according to claim 27, wherein the tab section (111) is further provided with a positioning hole at least partially located between the first reinforcing portion (12a) and the second reinforcing portion (12b).

31. The current collector (100) according to claim 26, wherein the current collector body (11) comprises a first side edge (113) and a second side edge (114) oppositely arranged along a width direction. The reinforcing portion (12) is bendably connected to one of the first side edge (113) and the second side edge (114) on one side of the current collector body (11) along the width direction, and is adjacently arranged to the other of the first side edge (113) and the second side edge (114) on the other side of the current collector body (11) along the width direction.

32. The current collector (100) according to claim 26, wherein the reinforcing portion (12) comprises a connecting side edge (124) connected to one side edge of the current collector body (11) along a width direction and a first free side edge (1251) adjacently arranged to one side edge of the tab section (111) away from the tab section (112), and the first free side edge (1251) is provided with a first avoidance structure (126) which is recessed inwardly from the one side edge of the tab section (111) away from the tab section.

33. The current collector (100) according to claim 26, wherein one end of the tab section (111) away from the tab section (112) is adjacently arranged to one end of the reinforcing portion (12) to form a first end portion of the current collector, and at least one corner of the first end portion is provided with an avoidance gap.

34. The current collector (100) according to claim 26, wherein an outer side of a connection between the current collector body (11) and the reinforcing portion (12) is arc-shaped.

35. A current collector (100) as claimed in claim 1, wherein, The current collector body (11) comprises a pole post section (111) for electrical connection with a pole post, an ear section (112) comprising an ear section body (1122) and an ear connecting structure (1121), the ear section (112) being connected to the pole post section (111), the ear connecting structure being bendably connected to the ear section body and being used for electrical connection with an ear of a core pack, and a holding section (115) protruding from a side of the ear section body away from the core pack for clamping and fixing by an external device. The reinforcing portion (12) is arranged at least partially on one side surface of the holding section (115) in a thickness direction.

36. The current collector (100) according to claim 35, wherein the reinforcing portion (12) and the holding section (115) are bendably connected to at least one side surface of the holding section (115) in a thickness direction.

37. The current collector (100) according to claim 36, wherein the reinforcing portion (12) comprises a connecting side edge (124) and a second free side edge (125), the connecting side edge (124) being connected to a side edge of the holding section (115) in a width direction of the current collector body (11), the second free side edge (125) being arranged adjacent to a side edge of the holding section (115) away from the ear section (112), and the second free side edge (125) being provided with a clearance structure, the clearance structure being recessed from the side edge of the holding section (115) away from the ear section (112).

38. The current collector (100) according to claim 36, wherein the current collector body (11) comprises a first side edge (113) and a second side edge (114) arranged opposite to each other in a width direction. The reinforcing portion comprises a first reinforcing portion (12a) and a second reinforcing portion (12b) arranged opposite to each other in a width direction of the current collector body (11), the first reinforcing portion (12a) being connected to the first side edge (113), the second reinforcing portion (12b) being connected to the second side edge (114), and the first reinforcing portion (12a) and the second reinforcing portion (12b) being arranged spaced apart from each other in the width direction of the current collector body (11).

39. The current collector (100) according to claim 38, wherein a gap between the first reinforcing portion (12a) and the second reinforcing portion (12b) is greater than or equal to 0.2 millimeters.

40. The current collector (100) according to claim 38, wherein the number of the tab connecting structure is at least one, and the tab connecting structure (1121) is connected to at least one of the first side edge (113) and the second side edge (114), and the width ratio of the tab connecting structure (1121) to the first or second reinforcing portion (12a, 12b) connected to the same side edge of the current collector body (11) is 0.8-1.

2.

41. The current collector (100) according to claim 36, wherein the current collector body (11) comprises a first side edge (113) and a second side edge (113) oppositely arranged along the width direction; the reinforcing portion is connected to one of the first side edge (113) and the second side edge (113) along one side of the current collector body (11) along the width direction, and the reinforcing portion (12) is arranged adjacent to the other of the first side edge (113) and the second side edge (113) along the other side of the current collector body (11) along the width direction.

42. The current collector (100) according to claim 36, wherein the holding section (115) is arranged adjacent to one end of the reinforcing portion at the end away from the tab section to form a second end portion of the current collector (100), and at least one corner of the second end portion is provided with a clearance gap.

43. The current collector (100) according to claim 36, wherein the connection between the current collector body (11) and the reinforcing portion (12) is an arc surface structure.

44. The current collector (100) according to any one of claims 35-43, wherein the reinforcing portion (12) and the tab connecting structure (1121) are spaced apart.

45. The current collector (100) according to any one of claims 35-43, wherein the reinforcing portion (12) extends from at least one end of the holding section (115) away from the tab section (112) to the bending connection between the holding section (115) and the tab section (112).

46. A top cover assembly, comprising: a cover body; a current collector (100) according to any one of claims 1-45, wherein the current collector is mounted to the cover body; and a pole, wherein the pole is mounted to the cover body and electrically connected to the tab section (112).

47. The top cover assembly according to claim 46, wherein along the length direction of the tab section (111), the distance between the center of the pole and the tab section (112) is L2, and the length of the cover body is L1; 5mm≤L2≤(L1) / 3.

48. A battery, comprising: a shell provided with a mounting cavity; a core package arranged in the mounting cavity, wherein the core package is provided with the tab; and a top cover assembly according to any one of claims 46 or 47, wherein the cover body is fixedly connected to the shell to seal the mounting cavity, and the tab section (112) is electrically connected to the tab. wherein 49. The battery according to claim 48, wherein along the width direction of the current collector body (11), the width ratio of the current collector body (11) to the shell is less than or equal to 0.

9. ​ ​ ​ ​ ​ ​ 50. The battery of claim 48, wherein the thickness direction of the tab section (112) is the same as the length direction of the battery, and the ratio of the thickness of the current collector (100) to the length of the battery is 0.0025-0.

05.

51. The battery of claim 48, wherein when the tab section (112) comprises a tab connecting structure (1121), the thickness direction of the tab section (112) is perpendicular to the height direction of the battery, along the height direction of the battery, the total height of the battery is H, the total height of the tab connecting structure (1121) is hi, and the distance between the tab connecting structure (1121) and the post section (111) is h2; wherein, h2≤ (H-5) / 2-h1; and / or, h2+h1 / 2 is 25-100 mm.

52. An electric device comprising the battery of any one of claims 48-51. ​ ​

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