Current collection assembly, battery monomer, battery and vehicle

Abstract

The embodiment of the invention provides a current collecting assembly, a battery monomer, a battery and a vehicle. The current collecting assembly comprises a positive current collecting disc, a negative current collecting disc and an insulating support, the negative current collecting disc is arranged on one side of the positive current collecting disc, the insulating support comprises an insulating part and a supporting part which are connected with each other, and the insulating part is located between the positive current collecting disc and the negative current collecting disc and connected with the positive current collecting disc and the negative current collecting disc; the supporting part is located on the side, away from the negative current collecting plate, of the positive current collecting plate, so that when the current collecting assembly is assembled into the battery single body, the negative current collecting plate can be directly and electrically connected with a shell of the battery single body without bypassing an insulating support, the size of the negative current collecting plate can be reduced to a certain extent, and the utilization rate of the internal space of the battery single body is improved.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of batteries, and in particular relates to a current collecting assembly, a battery cell, a battery and a vehicle. Background Art

[0002] A battery cell is the smallest unit that constitutes a battery, which may include a shell and an electrode assembly and a current collecting assembly located inside the shell. The shell may include a shell body and a pole. The current collecting assembly may include a positive current collecting disc, a negative current collecting disc and an insulating bracket. The positive current collecting disc is electrically connected to the pole, while the negative current collecting disc is electrically connected to the shell body. In addition, the positive current collecting disc and the negative current collecting disc are insulated by the insulating bracket, thereby realizing the input and output of the battery cell.

[0003] However, since the existing insulating bracket is usually arranged around the circumference of the positive current collector and the negative current collector, the negative current collector needs to bypass the insulating bracket to be electrically connected to the shell body, thereby increasing the volume of the negative current collector, resulting in low space utilization in the battery cell. Summary of the invention

[0004] The embodiments of the present application provide a current collecting assembly, a battery cell, a battery and a vehicle, which can reduce the space occupied by the insulating bracket in the battery cell and improve the space utilization inside the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a current collecting assembly, which includes a positive current collecting disk, a negative current collecting disk and an insulating bracket, wherein the negative current collecting disk is arranged on one side of the positive current collecting disk; the insulating bracket is arranged around the circumference of the positive current collecting disk, and the insulating bracket includes an insulating portion and a supporting portion that are connected to each other, the insulating portion is located between the positive current collecting disk and the negative current collecting disk, and is respectively connected to the positive current collecting disk and the negative current collecting disk, and the supporting portion is located on the side of the positive current collecting disk away from the negative current collecting disk.

[0006] In some embodiments, the negative electrode current collector disk includes a first disk body and a first adapter portion that are connected to each other. The side of the first disk body close to the positive electrode current collector disk is connected to the insulating bracket. The side of the first disk body along the first direction has a connection position suitable for connecting the negative electrode ear of the battery cell. The first adapter portion protrudes along the first direction relative to the first disk body. The first adapter portion is used to fit and electrically connect with the shell. The first direction is the thickness direction of the positive electrode current collector disk.

[0007] In some embodiments, the first disk body has a first edge and a second edge, the first edge and the second edge are connected end to end along the circumference of the first disk body, the first edge is located on the side of the first disk body facing the positive current collecting disk and is connected to the insulating bracket, and the first transition portion is located at the second edge and extends along the extension direction of the second edge.

[0008] In some embodiments, at least one of the positive current collector disc and the negative current collector disc is embedded in the insulating portion along the second direction; and / or the positive current collector disc is embedded in the supporting portion along the second direction, and the second direction is the setting direction of the positive current collector disc and the negative current collector disc.

[0009] In some embodiments, the support portion includes a first sub-portion and a second sub-portion, the first sub-portion is connected to the positive current collecting disk, the second sub-portion is arranged on the side of the first sub-portion away from the positive current collecting disk, the second sub-portion protrudes along a first direction relative to the first sub-portion for fitting with the shell, and the first direction is the thickness direction of the positive current collecting disk.

[0010] In some embodiments, a fixing hole is provided in the portion where the negative current collecting disc is embedded in the insulating part, the insulating part includes an insulator part and a fixing column, a groove is provided on the side of the insulator part facing the negative current collecting disc, the negative current collecting disc is embedded in the groove, the fixing column is located in the groove and inserted in the fixing hole.

[0011] In the second aspect, some embodiments of the present application provide a battery cell, comprising a shell, an electrode assembly and any of the above-mentioned current collecting assemblies, the shell comprising a shell body and an end cover, the end cover comprising a cover body and a pole column insulated from each other, the cover body being electrically connected to the shell body; the electrode assembly is arranged in the shell, the electrode assembly having a positive pole tab and a negative pole tab, the positive pole tab and the negative pole tab are respectively located on one side of the electrode assembly close to the end cover; the current collecting assembly is arranged between the electrode assembly and the end cover, the positive current collecting plate of the current collecting assembly is respectively electrically connected to the positive pole tab and the pole column, and the negative current collecting plate of the current collecting assembly is respectively electrically connected to the negative pole tab and the shell body.

[0012] In some embodiments, the projection of the positive electrode tab on the cover body along the thickness direction of the cover body overlaps with the projection of the positive electrode collecting plate on the cover body along the thickness direction of the cover body; and / or, the projection of the negative electrode tab on the cover body along the thickness direction of the cover body overlaps with the projection of the negative electrode collecting plate on the cover body along the thickness direction of the cover body.

[0013] In some embodiments, the projection area of ​​the negative electrode tab on the cover body along the thickness direction of the cover body is larger than the projection area of ​​the positive electrode tab on the cover body along the thickness direction of the cover body.

[0014] In some embodiments, the pole is inserted into the cover body along the thickness direction of the cover body, the outer periphery of the pole is recessed to form a slot, the slot is arranged around the circumference of the pole, and the cover body is locked in the slot.

[0015] In some embodiments, the slot includes a bottom wall, a first side wall and a second side wall, the second side wall is located on the side of the bottom wall away from the electrode assembly along the thickness direction of the cover body, the second side wall includes a side wall body and a supporting portion arranged on the side of the side wall body away from the bottom wall, the supporting portion protrudes relative to the side wall body toward the side close to the first side wall for supporting the cover body.

[0016] In some embodiments, the cover body is recessed along its thickness direction from a side away from the electrode assembly to a side close to the electrode assembly to form a limiting groove, the limiting groove extends around the circumference of the pole, and the supporting portion is clamped in the limiting groove.

[0017] In some embodiments, the battery cell further includes a sealing member, and a liquid injection hole is opened in the pole along the thickness direction of the cover body, and the sealing member is sealed in the liquid injection hole.

[0018] In some embodiments, the seal includes an elastic sealing column and a fixed sealing cover, the injection hole includes a first hole segment and a second hole segment arranged in sequence along the thickness direction of the cover body, the first hole segment is located on the side of the second hole segment away from the electrode assembly, the elastic sealing column is arranged in the second hole segment, and the fixed sealing cover is fixedly arranged in the first hole segment.

[0019] In some embodiments, the positive current collecting disk includes a second disk body and a second adapter portion which are electrically connected to each other, the second disk body is respectively connected to the positive electrode ear and the insulating bracket, the second adapter portion is located on a side of the second disk body close to the pole along the thickness direction of the cover body, the second adapter portion is inserted into at least a portion of the second hole section and is electrically connected to the pole, the positive current collecting disk is provided with a through hole along the thickness direction of the cover body, and an elastic sealing column is inserted into the through hole to seal the through hole.

[0020] In a third aspect, an embodiment of the present application further provides a battery, comprising any of the battery cells described above.

[0021] In a fourth aspect, an embodiment of the present application also provides a vehicle, comprising the battery described above.

[0022] The embodiment of the present application provides a current collecting assembly, a battery cell, a battery and a vehicle. The current collecting assembly includes a positive current collecting disc, a negative current collecting disc and an insulating bracket, wherein the negative current collecting disc is arranged on one side of the positive current collecting disc, and the insulating bracket is arranged around the circumference of the positive current collecting disc, and the insulating bracket includes an insulating portion and a supporting portion connected to each other, wherein the insulating portion is located between the positive current collecting disc and the negative current collecting disc, and is connected to the positive current collecting disc and the negative current collecting disc respectively, and the supporting portion is located on the side of the positive current collecting disc away from the negative current collecting disc, so that when the current collecting assembly is assembled into the battery cell, the negative current collecting disc can be directly electrically connected to the shell of the battery cell without bypassing the insulating bracket, thereby reducing the volume of the negative current collecting disc to a certain extent and improving the utilization rate of the internal space of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an exploded view of a current collecting assembly provided in some embodiments of the present application;

[0024] Figure 2 is an assembly diagram of a current collecting assembly provided in some embodiments of the present application;

[0025] Figure 3 is a schematic diagram of the structure of an insulating bracket provided in some embodiments of the present application;

[0026] Figure 4 is an exploded view of a battery cell provided in some embodiments of the present application;

[0027] Figure 5 is a partial cross-sectional view of a battery cell provided by some embodiments of the present application when it is cut along the thickness direction of the cover body;

[0028] Figure 6 is an exploded view of an end cover provided in some embodiments of the present application.

[0029] Description of Figure Numbers:

[0030] Current collecting assembly 10; positive current collecting plate 11; second plate body 111; second adapter portion 112; through hole 113; negative current collecting plate 12; first plate body 121; first adapter portion 122; first edge S1; second edge S2; fixing hole 123; liquid through hole 124; insulating bracket 13; insulating portion 131; supporting portion 132; first sub-portion 133; second sub-portion 134; reinforcing rib 135; weight-reducing groove 136; insulator portion 136; groove 137; embedding groove 138 ; Shell 20; Shell body 21; End cover 22; Cover body 221; Post 222; Protrusion 2111; Positioning step 2112; Slot 2221; Bottom wall 2222; First side wall 2223; Second side wall 2224; Abutment 2225; Filling hole 2226; Electrode assembly 30; Positive pole ear 31; Negative pole ear 32; Insulating spacer 40; Insulating sealing ring 50; Seal 60; Elastic sealing column 61; Fixed sealing cover 62; First direction X; Second direction Y. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0033] Figure 1 is an exploded view of a current collecting assembly provided in some embodiments of the present application, Figure 2 It is an assembly diagram of the current collecting assembly provided in some embodiments of the present application.

[0034] like Figure 1 and Figure 2 As shown, in the first aspect, an embodiment of the present application provides a current collecting assembly 10, the current collecting assembly 10 includes a positive current collecting disk 11, a negative current collecting disk 12 and an insulating bracket 13, the negative current collecting disk 12 is arranged on one side of the positive current collecting disk 11; the insulating bracket 13 is arranged around the circumference of the positive current collecting disk 11, and the insulating bracket 13 includes an insulating portion 131 and a supporting portion 132 that are connected to each other, the insulating portion 131 is located between the positive current collecting disk 11 and the negative current collecting disk 12, and is respectively connected to the positive current collecting disk 11 and the negative current collecting disk 12, and the supporting portion 132 is located on the side of the positive current collecting disk 11 away from the negative current collecting disk 12.

[0035] The positive electrode collector plate 11 can be used to connect the positive electrode tab 31 and the positive electrode input and output terminal of the battery cell, and the negative electrode collector plate 12 can be used to connect the negative electrode tab 32 and the negative electrode input and output terminal of the battery cell; optionally, the positive electrode input and output terminal can be the pole 222, and the negative electrode input and output terminal can be the shell 20.

[0036] The insulating bracket 13 is used to achieve insulation and fixation between the positive current collecting disc 11 and the negative current collecting disc 12, and the insulating bracket 13 can also be used to achieve insulation between the positive current collecting disc 11 and the shell 20. Specifically, in the insulating bracket 13, the insulating portion 131 and the supporting portion 132 can be connected end to end, the insulating portion 131 is located between the positive current collecting disc 11 and the negative current collecting disc 12, and it can extend along the first edge S1 of the negative current collecting disc 12, and the supporting portion 132 is located on the side of the positive current collecting disc 11 away from the negative current collecting disc 12, that is, the supporting portion 132 can extend along the edge of the positive current collecting disc 11 that is not facing the negative current collecting disc 12. The insulating portion 131 can be connected to the negative electrode current collecting disc 12 and the positive electrode current collecting disc 11 respectively, and the supporting portion 132 can be fitted with the shell 20 of the battery cell, so as to achieve insulation and fixation of the positive electrode current collecting disc 11 and the negative electrode current collecting disc 12. The structure is simple, and the insulating bracket 13 is arranged around the circumference of the positive electrode current collecting disc 11, and it will not occupy the space on the outer peripheral side of the negative electrode current collecting disc 12 away from the positive electrode current collecting disc 11, thereby improving the space utilization rate in the battery cell.

[0037] In the current collecting assembly 10 provided in the embodiment of the present application, an insulating bracket 13 is arranged to surround the circumference of the positive current collecting disc 11, and the insulating portion 131 of the insulating bracket 13 is located between the positive current collecting disc 11 and the negative current collecting disc 12, and is respectively connected to the positive current collecting disc 11 and the negative current collecting disc 12, and the supporting portion 132 is located on the side of the positive current collecting disc 11 away from the negative current collecting disc 12. Therefore, when the current collecting assembly 10 is assembled into a battery cell, the negative current collecting disc 12 can be directly electrically connected to the shell 20 of the battery cell without bypassing the insulating bracket 13, thereby simplifying the structure of the negative current collecting disc 12 to a certain extent, reducing the volume of the negative current collecting disc 12, and improving the utilization rate of the internal space of the battery cell.

[0038] It can be understood that in this embodiment, since the support portion 132 can be fitted with the shell 20, the support portion 132 can support the negative electrode current collecting plate 12 during the welding process of the negative electrode current collecting plate 12 and the shell 20, thereby avoiding deformation of the negative electrode current collecting plate 12 and improving the welding quality of the negative electrode current collecting plate 12 and the shell 20.

[0039] Please continue to refer to Figure 1 In some embodiments, the negative electrode current collecting disc 12 includes a first disc body 121 and a first adapter portion 122 which are connected to each other. The first disc body 121 is connected to the insulating bracket 13 on one side close to the positive electrode current collecting disc 11. The first disc body 121 has a connection position suitable for connecting the negative electrode tab 32 of the battery cell on one side along the first direction X. The first adapter portion 122 protrudes relative to the first disc body 121 along the first direction X. The first adapter portion 122 is used to fit and electrically connect to the shell 20. The first direction X is the thickness direction of the positive electrode current collecting disc 11.

[0040] The first direction X may be the thickness direction of the positive current collector disk 11 or the negative current collector disk 12, and the first direction X may also be the length direction of the battery cell. The first disk body 121 has a connection position on one side along the first direction X, and the connection position may be electrically connected to the negative electrode tab 32. Specifically, the connection position may be electrically connected to the negative electrode tab 32 by an electrical connection method such as a welding process; the first adapter 122 may be arranged on the outer peripheral side of the first disk body 121 away from the positive current collector. At this time, the first adapter 122 may be fitted with the shell 20, and the electrical connection between the two may be achieved by an electrical connection method such as a welding process. When the current collector assembly 10 is assembled into the battery cell, the first adapter 122 may protrude relative to the first disk body 121 along the first direction X toward the side away from the negative electrode tab 32, thereby increasing the contact area between the first adapter 122 and the shell 20.

[0041] In this embodiment, the first adapter portion 122 protrudes relative to the first disk body 121 along the first direction X, and the first adapter portion 122 is used to fit and electrically connect with the shell 20, thereby increasing the contact area between the negative electrode current collecting disk 12 and the shell 20 and improving the conductive effect.

[0042] Optionally, the first adapter portion 122 can also be arranged on the side of the first disk body 121 away from the negative electrode ear 32 along the first direction X. In this case, the first adapter portion 122 can be attached to and electrically connected to the shell 20. At the same time, the outer peripheral side of the first disk body 121 away from the positive electrode current collecting disk 11 can also be attached to and electrically connected to the shell 20.

[0043] Please continue to refer to Figure 1 In some embodiments, the first disk body 121 has a first edge S1 and a second edge S2, and the first edge S1 and the second edge S2 are connected end to end along the circumference of the first disk body 121. The first edge S1 is located on the side of the first disk body 121 facing the positive current collecting disk 11 and is connected to the insulating bracket 13. The first adapter 122 is located on the second edge S2 and extends along the extension direction of the second edge S2.

[0044] The second edge S2 is all the side edges of the first disk body 121 except the first edge S1. When the first edge S1 is located on the side of the first disk body 121 facing the positive current collecting disk 11, the second edge S2 is all the edges of the first disk body 121 not facing the positive current collecting disk 11. The shape of the second edge S2 can be adapted to the shape of the shell 20 of the battery cell. For example, when the battery cell is cylindrical, the first disk body 121 can be fan-shaped. At this time, the first edge S1 can be the edge where the two radii of the fan are located, and the second edge S2 can be the arc-shaped edge in the fan. Correspondingly, the first adapter 122 can also be arc-shaped, so as to facilitate fitting with the shell 20. Of course, the battery cell can also be square or other shapes, which is not specifically limited in this embodiment.

[0045] In this embodiment, by providing the first adapter portion 122 extending along the second edge S2 of the first disk body 121 , when the first adapter portion 122 is in contact with the shell 20 , the contact area between the two can be further increased, thereby improving the conductive effect between the negative electrode current collecting disk 12 and the shell 20 .

[0046] Optionally, the connection between the first edge S1 and the insulating bracket 13 may be achieved by any method such as adhesive connection, injection molding connection, fastener connection, etc.

[0047] Please continue to refer to Figure 2In some embodiments, at least one of the positive current collecting disk 11 and the negative current collecting disk 12 is embedded in the insulating portion 131 along the second direction Y; and / or, the positive current collecting disk 11 is embedded in the supporting portion 132 along the second direction Y, and the second direction Y is the setting direction of the positive current collecting disk 11 and the negative current collecting disk 12.

[0048] The negative electrode current collecting disk 12 is arranged on one side of the positive electrode current collecting disk 11, and the second direction Y can be the arrangement direction of the positive electrode current collecting disk 11 and the negative electrode current collecting disk 12. The second direction Y and the first direction X can be perpendicular to each other, and when the current collecting assembly 10 is assembled inside the battery cell, the second direction Y can also be the width direction or thickness direction of the battery cell. At least one of the positive electrode current collecting disk 11 and the negative electrode current collecting disk 12 can be embedded in the insulating portion 131 along the second direction Y, and / or the positive electrode current collecting disk 11 can be embedded in the supporting portion 132 along the second direction Y; specifically, the side of the positive electrode current collecting disk 11 facing the negative electrode current collecting disk 12 can be embedded in the insulating portion 131 while the negative electrode current collecting disk 12 is not embedded in the insulating portion 131, and / or the side of the positive electrode current collecting disk 11 facing away from the negative electrode current collecting disk 12 can be embedded in the supporting portion 132; or, the negative electrode current collecting disk 12 facing the positive electrode current collecting disk 11 One side of the positive current collecting disk 11 facing the negative current collecting disk 12 may be embedded in the insulating portion 131 while the side of the positive current collecting disk 11 facing the negative current collecting disk 12 is not embedded in the insulating portion 131, and / or, the side of the positive current collecting disk 11 facing away from the negative current collecting disk 12 is embedded in the supporting portion 132; or, the side of the positive current collecting disk 11 facing the negative current collecting disk 12 and the side of the negative current collecting disk 12 facing the positive current collecting disk 11 are simultaneously embedded in both sides of the insulating portion 131 along the second direction Y, and / or, the side of the positive current collecting disk 11 facing away from the negative current collecting disk 12 may be embedded in the supporting portion 132.

[0049] In this embodiment, at least one of the positive current collecting disc 11 and the negative current collecting disc 12 is embedded in the insulating portion 131 along the second direction Y; and / or the positive current collecting disc 11 is embedded in the supporting portion 132 along the second direction Y, thereby improving the structural strength of the positive current collecting disc 11 and / or the negative current collecting disc 12 when connected to the insulating bracket 13.

[0050] Figure 3 It is a schematic diagram of the structure of the insulating bracket provided in some embodiments of the present application.

[0051] like Figure 3 As shown, in some embodiments, the support portion 132 includes a first sub-portion 133 and a second sub-portion 134, the first sub-portion 133 is connected to the positive current collecting disk 11, and the second sub-portion 134 is arranged on the side of the first sub-portion 133 away from the positive current collecting disk 11, and the second sub-portion 134 protrudes along the first direction X relative to the first sub-portion 133 for fitting with the shell 20, and the first direction X is the thickness direction of the positive current collecting disk 11.

[0052] The first sub-portion 133 and the second sub-portion 134 extend respectively along the edge of the positive current collecting disc 11 that is not facing the negative current collecting disc 12, the first sub-portion 133 is connected to the positive current collecting disc 11, and the side of the positive current collecting disc 11 that is away from the negative current collecting disc 12 can be embedded in the first sub-portion 133. The second sub-portion 134 is located on the side of the first sub-portion 133 that is away from the positive current collecting disc 11, the first sub-portion 133 is located between the second sub-portion 134 and the positive current collecting disc 11, and the side of the second sub-portion 134 that is away from the first sub-portion 133 can be in contact with the housing 20.

[0053] In this embodiment, the support portion 132 includes a first sub-portion 133 and a second sub-portion 134, the first sub-portion 133 is connected to the positive current collecting disk 11, and the second sub-portion 134 is arranged on the side of the first sub-portion 133 away from the positive current collecting disk 11, and the second sub-portion 134 protrudes along the first direction X relative to the first sub-portion 133 to fit with the shell 20, so as to increase the contact area between the support portion 132 and the shell 20, and improve the supporting stability of the insulating bracket 13 to the positive current collecting disk 11 and the negative current collecting disk 12.

[0054] Optionally, the support portion 132 further includes a reinforcing rib 135, which connects the first sub-portion 133 and the second sub-portion 134. Specifically, since the second sub-portion 134 protrudes along the first direction X relative to the first sub-portion 133, a step portion can be formed between the first sub-portion 133 and the second sub-portion 134, and the reinforcing rib 135 can be arranged at the step portion. The reinforcing rib 135 is respectively connected to two step surfaces of the step portion, thereby improving the structural strength of the insulating bracket 13. Further, the number of the reinforcing ribs 135 can be multiple, and the multiple reinforcing ribs 135 are arranged at intervals along the extension direction of the first sub-portion 133 or the second sub-portion 134 to further improve the structural strength of the insulating bracket 13.

[0055] Optionally, a weight-reducing groove 136 may be formed on the insulating portion 131 to reduce the weight of the current collecting assembly 10. The shape and size of the weight-reducing groove 136 may be flexibly set in practical applications. Optionally, there may be a plurality of weight-reducing grooves 136, and the plurality of weight-reducing grooves 136 may be spaced apart on the insulating portion 131 to further reduce the weight of the current collecting assembly 10.

[0056] Please continue to refer to Figure 1 and Figure 3 In some embodiments, a fixing hole 123 is provided in the portion where the negative electrode current collecting disc 12 is embedded in the insulating portion 131. The insulating portion 131 includes an insulator portion 136 and a fixing column. The insulator portion 136 has a groove 137 on the side facing the negative electrode current collecting disc 12. The negative electrode current collecting disc 12 is embedded in the groove 137. The fixing column is located in the groove 137 and is inserted into the fixing hole 123.

[0057] The fixing hole 123 is formed on the portion of the negative electrode current collecting disc 12 embedded in the insulating portion 131, that is, the fixing hole 123 is arranged close to the first edge S1 of the negative electrode current collecting disc 12. When the first edge S1 of the negative electrode current collecting disc 12 is embedded in the groove 137 of the insulating portion 131, the fixing column located in the groove 137 can be inserted into the fixing hole 123 to further fix the negative electrode current collecting disc 12.

[0058] Optionally, there may be a plurality of fixing holes 123 , and the plurality of fixing holes 123 are arranged at intervals along the extending direction of the first edge S1 , so as to further improve the connection stability between the negative electrode current collecting disc 12 and the insulating bracket 13 .

[0059] Please continue to refer to Figure 3 Optionally, an embedding groove 138 for embedding the positive current collector 11 may be formed on the insulator portion 136 and / or the support portion 132, and the positive current collector 11 is embedded in the embedding groove 138. Further, a fixing groove may be formed on the positive current collector 11, and the fixing groove is arranged near the edge of the positive current collector 11, and the opening of the fixing groove faces the support portion 132 or the insulating portion 131. Correspondingly, a clamping block may be formed on the insulating bracket 13, and the clamping block is arranged in the embedding groove 138 and is engaged in the fixing groove to further limit the positive current collector 11.

[0060] Furthermore, the number of the fixing grooves and the clamping blocks can be multiple, and the multiple fixing grooves are arranged at intervals along the circumference of the positive electrode current collecting disk 11. The multiple fixing grooves are clamped with the multiple clamping blocks in a one-to-one correspondence, thereby further limiting the positive electrode current collecting disk 11.

[0061] Optionally, the positive collector disc 11 and the negative collector disc 12 may be assembled onto the insulating bracket 13 by using an injection molding process. Specifically, the positive collector disc 11 and the negative collector disc 12 may be placed in preset positions of the injection mold respectively, and then an injection molding medium may be injected into the injection mold so that the injection molding medium is arranged along the outer peripheral side of the positive collector disc 11 and the first edge S1 of the negative collector disc 12. After the medium is solidified, the positive collector disc 11, the negative collector disc 12 and the insulating bracket 13 are assembled. It is understandable that in the process of injecting the injection molding medium into the mold, the injection molding medium may be filled in the fixing hole 123 of the negative collector disc 12 and the fixing groove of the positive collector disc 11. After the medium is fixed, a fixing column is formed in the fixing hole 123 and a clamping block is formed in the fixing groove.

[0062] Please continue to refer to Figure 1 Optionally, at least one of the positive electrode current collecting disc 11 and the negative electrode current collecting disc 12 may be formed with at least one liquid passage hole 124 to allow electrolyte to flow.

[0063] Figure 4is an exploded diagram of a battery cell provided in some embodiments of the present application.

[0064] like Figure 4 As shown, in the second aspect, some embodiments of the present application provide a battery cell, including a shell 20, an electrode assembly 30 and a current collecting assembly 10 of any of the above items, the shell 20 includes a shell body 21 and an end cover 22, the end cover 22 includes a cover body 221 and a pole 222 insulated from each other, and the cover body 221 is electrically connected to the shell body 21; the electrode assembly 30 is arranged in the shell 20, and the electrode assembly 30 has a positive pole tab 31 and a negative pole tab 32, and the positive pole tab 31 and the negative pole tab 32 are respectively located on one side of the electrode assembly 30 close to the end cover 22; the current collecting assembly 10 is arranged between the electrode assembly 30 and the end cover 22, the positive current collecting plate 11 of the current collecting assembly 10 is respectively electrically connected to the positive pole tab 31 and the pole 222, and the negative current collecting plate 12 of the current collecting assembly 10 is respectively electrically connected to the negative pole tab 32 and the shell body 21. The battery cell provided in the embodiment of the present application has the technical effect of the technical solution of the current collecting assembly 10 in any of the above embodiments, and the explanation of the structures and terms that are the same or corresponding to the above embodiments will not be repeated here.

[0065] The cover body 221 and the shell body 21 can be electrically connected by welding process or other electrical connection methods. When the positive current collecting plate 11 is electrically connected to the positive pole ear 31 and the pole 222 respectively, and the negative current collecting plate 12 is electrically connected to the negative pole ear 32 and the shell body 21 respectively, the pole 222 can be used as the positive input and output terminal, and the cover body 221 can be used as the negative input and output terminal to jointly realize the input or output of electrical energy of the battery cell. At this time, compared with connecting the negative current collecting plate 12 with the pole 222 as the negative input and output terminal, the assembly process of the battery cell can be simplified and the cost can be reduced.

[0066] The electrode assembly 30 may include a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode main body and a positive electrode tab 31. The positive electrode sheet may be formed by coating a positive electrode active layer with a positive electrode collector, wherein the positive electrode main body is the portion of the positive electrode collector coated with the positive electrode active layer, and the positive electrode tab 31 is the portion of the positive electrode collector not coated with the positive electrode active layer. The negative electrode sheet may include a negative electrode main body and a negative electrode tab 32. The negative electrode sheet may be formed by coating a negative electrode active layer with a negative electrode collector, wherein the negative electrode main body is the portion of the negative electrode collector coated with the negative electrode active layer, and the negative electrode tab 32 is the portion of the negative electrode collector not coated with the negative electrode active layer. Optionally, the positive electrode sheet and the negative electrode sheet of the electrode assembly 30 may be wound and arranged in a battery cell, or the positive electrode sheet and the negative electrode sheet may also be stacked and arranged in a battery cell. The arrangement method may be reasonably adjusted in practical applications, and this embodiment does not specifically limit it. It should be clarified that the battery cell in the embodiment of the present application can be a cylindrical battery cell or a square shell battery cell, and the actual shape of the battery cell is not limited.

[0067] In this embodiment, the positive electrode tab 31 and the negative electrode tab 32 are respectively located on one side of the electrode assembly 30 close to the end cover 22, the positive electrode tab 31 is electrically connected to the pole 222 through the positive current collecting plate 11, and the negative electrode tab 32 is electrically connected to the cover body 221 through the negative current collecting plate 12 and the shell body 21. At this time, compared with respectively arranging the positive electrode tab 31 and the negative electrode tab 32 on the opposite sides of the electrode assembly 30, the conductive path between the negative electrode tab 32 and the cover body 221 can be shortened, the overall resistance of the battery cell can be reduced, and the charge and discharge rate of the battery cell can be improved.

[0068] Moreover, in the present embodiment, the positive electrode current collecting plate 11 and the negative electrode current collecting plate 12 can be assembled simultaneously on one side of the electrode assembly 30 close to the end cover 22. Compared with respectively assembling the positive electrode current collecting plate 11 and the negative electrode current collecting plate 12 on the opposite sides of the electrode assembly 30, the assembly process of the battery cell can be simplified, the number of welding and clamping times can be reduced, the assembly efficiency can be improved, and the process yield can be improved.

[0069] Optionally, the battery cell may further include an insulating sheet, which is disposed on the side of the electrode assembly 30 away from the end cap 22 and between the electrode assembly 30 and the shell body 21 to insulate the side of the electrode assembly 30 away from the end cap 22 from the shell body 21 .

[0070] Figure 5 It is a partial cross-sectional view of a battery cell provided in some embodiments of the present application when it is cut along the thickness direction of the cover body.

[0071] like Figure 4 and Figure 5As shown, optionally, the battery cell further includes an insulating spacer 40 , which is disposed between the current collecting assembly 10 and the cover body 221 to ensure that the positive electrode current collecting disc 11 is insulated from the cover body 221 .

[0072] Please continue to refer to Figure 5 Optionally, the side of the cover body 221 close to the electrode assembly 30 along its thickness direction may protrude in the direction close to the electrode assembly 30 to form a convex portion 2111, the convex portion 2111 is arranged close to the edge of the cover body 221 and is spaced from the edge of the cover body 221 by a preset distance, and a positioning step 2112 may be formed between the convex portion 2111 and the edge of the cover body 221, and the cover body 221 is supported on the shell body 21 through the positioning step 2112 to facilitate connection with the shell body 21. Further, the convex portion 2111 and the positioning step 2112 may be respectively arranged around the circumference of the cover body 221, so as to be connected to the shell body 21 around the circumference of the cover body 221.

[0073] In some embodiments, the projection of the positive electrode tab 31 on the cover body 221 along the thickness direction of the cover body 221 overlaps with the projection of the positive electrode collecting disk 11 on the cover body 221 along the thickness direction of the cover body 221; and / or, the projection of the negative electrode tab 32 on the cover body 221 along the thickness direction of the cover body 221 overlaps with the projection of the negative electrode collecting disk 12 on the cover body 221 along the thickness direction of the cover body 221, thereby increasing the contact area between the positive electrode collecting disk 11 and the positive electrode tab 31 and / or the contact area between the negative electrode collecting disk 12 and the negative electrode tab 32, thereby improving the conductive effect.

[0074] Optionally, in other embodiments, the projection of the positive electrode tab 31 on the cover body 221 along the thickness direction of the cover body 221 and the projection of the positive electrode collecting plate 11 on the cover body 221 along the thickness direction of the cover body 221 may also partially overlap, and / or, the projection of the negative electrode tab 32 on the cover body 221 along the thickness direction of the cover body 221 and the projection of the negative electrode collecting plate 12 on the cover body 221 along the thickness direction of the cover body 221 may also partially overlap. It is only necessary to ensure the electrical connection between the positive current collecting plate 11 and the positive electrode tab 31 and the electrical connection between the negative current collecting plate 12 and the negative electrode tab 32.

[0075] In some embodiments, the projection area of ​​the negative electrode tab 32 on the cover body 221 along the thickness direction of the cover body 221 is larger than the projection area of ​​the positive electrode tab 31 on the cover body 221 along the thickness direction of the cover body 221. Therefore, during the assembly process of the battery cell, the positive electrode tab 31 and the negative electrode tab 32 can play a certain fool-proof effect to prevent the electrode assembly 30 and the current collecting assembly 10 from being assembled incorrectly.

[0076] Please continue to refer to Figure 5In some embodiments, the pole 222 is inserted into the cover body 221 along the thickness direction of the cover body 221. The outer periphery of the pole 222 is recessed to form a card slot 2221. The card slot 2221 is arranged around the circumference of the pole 222. The cover body 221 is clamped in the card slot 2221 to realize the assembly of the pole 222. The structure is simple and easy to disassemble and assemble.

[0077] It can be understood that the cover body 221 may be provided with a mounting hole along its thickness direction, and the pole 222 may pass through the mounting hole along the thickness direction of the cover body 221 to be inserted into the battery cell.

[0078] Figure 6 is an exploded view of an end cover provided in some embodiments of the present application.

[0079] like Figure 5 and Figure 6 As shown, optionally, the end cap 22 may further include an insulating sealing ring 50, which may be disposed in the card slot 2221 and located between the pole 222 and the cover body 221 to separate the pole 222 from the cover body 221 and achieve insulation between the pole 222 and the cover body 221. At the same time, the insulating sealing ring 50 may also play a certain sealing role to prevent the gap between the pole 222 and the cover body 221 from affecting the sealing performance of the battery cell. Further, the insulating sealing ring 50 may extend outside the card slot 2221 along at least one side of the cover body 221 and cover the side wall surface of the pole 222 to improve the insulation effect.

[0080] Optionally, insulation can be achieved between the cover body 221 and the pole 222 by filling with insulating glue or coating with an insulating film.

[0081] Please continue to refer to Figure 5 In some embodiments, the slot 2221 includes a bottom wall 2222, a first side wall 2223 and a second side wall 2224, the second side wall 2224 is located on the side of the bottom wall 2222 away from the electrode assembly 30 along the thickness direction of the cover body 221, the second side wall 2224 includes a side wall body and a supporting portion 2225 arranged on the side of the side wall body away from the bottom wall 2222, the supporting portion 2225 protrudes relative to the side wall body toward the side close to the first side wall 2223, so as to be used for supporting the cover body 221.

[0082] The plane where the bottom wall 2222 is located can be parallel to the plane where the inner wall of the mounting hole of the cover body 221 is located. The first side wall 2223 is located on the side of the bottom wall 2222 close to the electrode assembly 30 along the thickness direction of the cover body 221. When the pole 222 is clamped on the cover body 221 through the clamping groove 2221, the first side wall 2223 and the second side wall 2224 can clamp the cover body 221 along the thickness direction of the cover body 221 to fix the pole 222.

[0083] In this embodiment, the second side wall 2224 includes a side wall body and a supporting portion 2225, and the supporting portion 2225 protrudes relative to the side wall body toward the side close to the first side wall 2223 to resist the cover body 221. Therefore, the supporting portion 2225 can cooperate with the first side wall 2223 to further lock the cover body 221 and improve the assembly stability of the pole 222.

[0084] Optionally, the abutting portion 2225 may be disposed around the circumference of the pole 222 to abut against the cover body 221 more stably.

[0085] In some embodiments, the cover body 221 is recessed along its thickness direction from the side away from the electrode assembly 30 to the side close to the electrode assembly 30 to form a limiting groove, which extends around the circumference of the pole 222, and the supporting portion 2225 is clamped in the limiting groove.

[0086] The limiting groove is formed by the cover body 221 being recessed along its own thickness direction from the side away from the electrode assembly 30 to the side close to the electrode assembly 30, and since the supporting portion 2225 protrudes relative to the side wall body toward the side close to the first side wall 2223, the supporting portion 2225 can be stuck in the limiting groove, thereby further improving the assembly stability of the pole 222.

[0087] Please continue to refer to Figure 5 and Figure 6 In some embodiments, the battery cell further includes a sealant 60 , and the pole 222 is provided with a liquid injection hole 2226 along the thickness direction of the cover body 221 , and the sealant 60 is sealed in the liquid injection hole 2226 .

[0088] The injection hole 2226 is used to inject electrolyte into the battery cell after the battery cell is assembled, and the seal 60 is used to seal the injection hole 2226 after the electrolyte is injected into the battery cell through the injection hole 2226 to improve the sealing performance of the battery cell. Optionally, the seal 60 can be arranged at one end of the injection hole 2226 away from the electrode assembly 30 along the thickness direction of the cover body 221, so as to facilitate the assembly of the seal 60 from the outside of the battery cell.

[0089] Please continue to refer to Figure 5 In some embodiments, the seal 60 includes an elastic sealing column 61 and a fixed sealing cover 62, the injection hole 2226 includes a first hole segment and a second hole segment arranged in sequence along the thickness direction of the cover body 221, the first hole segment is located on the side of the second hole segment away from the electrode assembly 30, the elastic sealing column 61 is arranged in the second hole segment, and the fixed sealing cover 62 is fixedly arranged in the first hole segment.

[0090] The elastic sealing column 61 can be used to temporarily block the injection hole 2226 during the process of injecting electrolyte into the battery cell, and the fixed sealing cover 62 is used to be fixedly connected to the pole 222 after the injection is completed to achieve the sealing of the battery cell for a long time. In addition, since the elastic sealing column 61 is set in the second hole section, the fixed sealing cover 62 is set in the first hole section, and the first hole section is located on the side of the second hole section away from the electrode assembly 30 along the thickness direction of the cover body 221, the fixed sealing cover 62 can also seal the elastic sealing column 61 in the battery cell after the injection is completed to prevent the elastic sealing column 61 from accidentally falling off. It can be understood that the elastic sealing column 61 can be interference fit with the second hole section, and the fixed sealing cover 62 can be welded in the first hole section in a circumferential manner by a welding process to ensure the sealing effect.

[0091] In this embodiment, the elastic sealing column 61 is arranged in the second hole section and the fixed sealing cover 62 is arranged in the first hole section, so that the sealing performance of the battery cell can be improved through double sealing of the elastic sealing column 61 and the fixed sealing cover 62.

[0092] Optionally, the diameter of the first hole segment can be larger than the diameter of the second hole segment. When the fixed sealing cover 62 is set in the first hole segment, the fixed sealing cover 62 can be set at the end of the second hole segment relative to the cover to increase the contact area between the fixed sealing cover 62 and the inner wall of the injection hole 2226, thereby further improving the sealing performance of the battery cell.

[0093] Please continue to refer to Figure 1 and Figure 5 In some embodiments, the positive current collecting disk 11 includes a second disk body 111 and a second adapter portion 112 which are electrically connected to each other. The second disk body 111 is respectively connected to the positive electrode ear 31 and the insulating bracket 13. The second adapter portion 112 is located on a side of the second disk body 111 close to the pole 222 along the thickness direction of the cover body 221. The second adapter portion 112 is inserted into at least a portion of the second hole section and is electrically connected to the pole 222. The positive current collecting disk 11 is provided with a through hole 113 along the thickness direction of the cover body 221, and the elastic sealing column 6160 is inserted into the through hole 113 to seal the through hole 113.

[0094] The side of the second disk body 111 close to the electrode assembly 30 along the thickness direction of the cover body 221 can be electrically connected to the positive electrode tab 31, and the insulating bracket 13 can be arranged around the circumference of the second disk body 111 to be connected to the second disk body 111. After the second adapter 112 is inserted into the second hole segment, the outer peripheral side of the second adapter 112 can be welded to the inner wall of the second hole segment to achieve the electrical connection between the second adapter 112 and the pole 222. At this time, compared with the electrical connection between the second adapter 112 and the pole 222 at the end of the pole 222 close to the electrode assembly 30 along the thickness direction of the cover body 221, the contact area between the second adapter 112 and the pole 222 can be increased, the conductive effect is improved, and welding is convenient.

[0095] The positive electrode current collecting disk 11 is provided with a through hole 113, and the through hole 113 can pass through the second adapter portion 112 and the second disk body 111 in sequence, and the projection of the through hole 113 on the cover body 221 along the thickness direction of the cover body 221 can be located within the projection of the injection hole 2226 on the cover body 221 along the thickness direction of the cover body 221. Therefore, when the second adapter portion 112 is inserted into the second hole section, the elastic sealing column 61 in the sealing member 60 can be inserted into the through hole 113 to seal the through hole 113.

[0096] Optionally, the second adapter portion 112 may include a first adapter sub-portion and a second adapter sub-portion, the first adapter sub-portion being electrically connected to the second disk body 111, and the second adapter sub-portion being disposed on a side of the first adapter sub-portion away from the second disk body 111 along the thickness direction of the cover body 221, so as to be inserted into the second hole section. Further, the projection of the second adapter sub-portion on the cover body 221 along the thickness direction of the cover body 221 is located within the projection of the first adapter sub-portion on the cover body 221 along the thickness direction of the cover body 221, thereby increasing the contact area between the second adapter sub-portion and the second disk body 111 and improving the welding effect of the two.

[0097] Optionally, the projection of the second adapter 112 on the cover body 221 along the thickness direction of the cover body 221 may overlap with the projection of the pole 222 on the cover body 221 along the thickness direction of the cover body 221. When the pole 222 is located at the center of the cover body 221, the portion of the second disk body 111 used for connecting with the second adapter 112 may protrude toward the center of the cover body 221, so that the position of the second adapter 112 may correspond to the position of the pole 222. It is understandable that when the second disk body 111 protrudes toward the center of the cover body 221, the first disk body 121 of the negative electrode current collecting disk 12 may be correspondingly recessed toward the center away from the cover body 221 to ensure insulation between the positive electrode current collecting disk 11 and the negative electrode current collecting disk 12.

[0098] Optionally, the second transition portion 112 may be integrally formed with the second disk body 111 . Specifically, the second transition portion 112 may be formed by extruding the current collecting disk material toward the direction close to the pole 222 through an extrusion process.

[0099] Optionally, the second adapter portion 112 and the second disk body 111 may also be two separate components, which may be connected by welding during the assembly of the battery cell. In this case, compared with the integrated arrangement of the second adapter portion 112 and the second disk body 111, the cost and production difficulty of the positive electrode current collecting disk 11 may be reduced.

[0100] Optionally, the second adapter portion 112 may be inserted in the entire second hole segment. In this case, the second adapter portion 112 extends to the end of the second hole segment close to the first hole segment, and the elastic sealing column 61 is sealed in the through hole 113 of the positive electrode current collecting disc 11 .

[0101] Optionally, the second hole segment may include a first sub-segment, a second sub-segment and a third sub-segment arranged in sequence from the first hole segment to the direction close to the electrode assembly 30, and the elastic sealing column 6160 may include a first column and a second column arranged in sequence from the first hole segment to the direction close to the electrode assembly 30.

[0102] Optionally, the second adapter 112 may be inserted into the second subsection and the third subsection, the first column is sealed in the first subsection, and the second column is sealed in the through hole 113 of the positive electrode current collector 11. Further, the inner diameter of the first subsection may be greater than or equal to the inner diameter of the second subsection, and the outer diameter of the first column may be greater than the outer diameter of the second column. In this case, the end of the first column close to the electrode assembly 30 along the thickness direction of the cover body 221 may abut against the end of the second adapter 112 away from the electrode assembly 30 along the thickness direction of the cover body 221, thereby increasing the contact area between the elastic sealing column 6160 and the second adapter 112 and improving the sealing effect of the elastic sealing column 61.

[0103] Optionally, the second adapter 112 can be inserted into the third sub-segment, the first column can be blocked in the first sub-segment and the second sub-segment, and the second column can be inserted into the through hole 113. Further, the inner diameter of the first sub-segment can be greater than the inner diameter of the second sub-segment. At this time, when the first column is blocked in the first sub-segment and the second sub-segment, a step can be formed at the position where the first sub-segment and the second sub-segment meet, thereby increasing the contact area between the first column and the injection hole 2226 and improving the sealing effect of the elastic sealing column 6160. Of course, the actual sizes of the first sub-segment, the second sub-segment and the third sub-segment can be reasonably set in actual applications, and this embodiment does not specifically limit them.

[0104] Optionally, the end of the elastic sealing column 61 close to the electrode assembly 30 along the thickness direction of the cover body 221 can pass through the through hole 113 to improve the sealing effect of the elastic sealing column 61 on the through hole 113 .

[0105] It can be understood that during the assembly of the battery cell in the embodiment of the present application, the positive current collecting disc 11 and the negative current collecting disc 12 of the current collecting assembly 10 can be welded to the positive electrode tab 31 and the negative electrode tab 32 in the electrode assembly 30 respectively, and then an insulating sheet can be loaded into the shell body 21, and then the pre-assembled current collecting assembly 10 and the electrode assembly 30 can be loaded into the shell body 21, and the negative current collecting disc 12 and the shell body 21 can be welded, and then the insulating sealing ring 50 can be inserted, the end cover 22 is covered on the opening of the shell body 21, and the cover body 221 and the shell body 21 are welded around the circumference of the cover body 221. After the welding of the cover body 221 and the shell body 21 is completed, the electrolyte is injected into the shell body 21 through the injection hole 2226. After the electrolyte injection is completed, the elastic sealing column 61 is inserted into the injection hole 2226, and the fixed sealing cover 62 is welded to the end of the injection hole 2226, and the assembly of the battery cell is completed.

[0106] In a third aspect, the present application also provides a battery, including any of the above-mentioned battery cells. The battery provided by the present application has the technical effects of the technical solution of the battery cell in any of the above-mentioned embodiments, and the explanation of the same or corresponding structures and terms as the above-mentioned embodiments will not be repeated here.

[0107] In a fourth aspect, the present application also provides a vehicle, including the battery described above. The vehicle provided by the present application has the technical effects of the technical solution of the battery in any of the above embodiments, and the explanation of the same or corresponding structures and terms as the above embodiments will not be repeated here.

[0108] The embodiment of the present application provides a current collecting assembly 10, a battery cell, a battery and a vehicle. The current collecting assembly 10 includes a positive current collecting disc 11, a negative current collecting disc 12 and an insulating bracket 13. The negative current collecting disc 12 is arranged on one side of the positive current collecting disc 11. The insulating bracket 13 is arranged around the circumference of the positive current collecting disc 11. The insulating bracket 13 is used to connect with the negative current collecting disc 12 and the shell 20 of the battery cell respectively, away from the outer peripheral side of the positive current collecting disc 11, so as to achieve insulation and connection of the positive current collecting disc 11 and the negative current collecting disc 12. The structure is simple, and the insulating bracket 13 does not need to occupy the space of the negative current collecting disc 12 away from the outer peripheral side of the positive current collecting disc 11, thereby improving the utilization rate of the internal space of the battery cell.

[0109] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A current collecting assembly, characterized in that: The current collecting assembly comprises: Positive electrode current collecting plate; A negative electrode current collecting plate, arranged on one side of the positive electrode current collecting plate; An insulating bracket is arranged around the circumference of the positive current collecting disc, and the insulating bracket includes an insulating portion and a supporting portion that are connected to each other. The insulating portion is located between the positive current collecting disc and the negative current collecting disc, and is respectively connected to the positive current collecting disc and the negative current collecting disc, and the supporting portion is located on a side of the positive current collecting disc away from the negative current collecting disc.

2. The current collecting assembly according to claim 1, characterized in that: The negative electrode current collecting disk comprises a first disk body and a first adapter portion which are connected to each other. The first disk body is connected to the insulating bracket on one side close to the positive electrode current collecting disk. The first disk body has a connection position suitable for connecting the negative electrode tab of the battery cell on one side along the first direction. The first adapter portion protrudes along the first direction relative to the first disk body. The first adapter portion is used to fit and electrically connect with the shell. The first direction is the thickness direction of the positive electrode current collecting disk.

3. The current collecting assembly according to claim 2, characterized in that: The first disk body has a first edge and a second edge, the first edge and the second edge are connected end to end along the circumferential direction of the first disk body, the first edge is located on the side of the first disk body facing the positive current collecting disk and is connected to the insulating bracket, and the first transition portion is located on the second edge and extends along the extension direction of the second edge.

4. The current collecting assembly according to any one of claims 1 to 3, characterized in that: At least one of the positive current collecting disc and the negative current collecting disc is embedded in the insulating portion along a second direction; and / or the positive current collecting disc is embedded in the supporting portion along the second direction, and the second direction is the arrangement direction of the positive current collecting disc and the negative current collecting disc.

5. The current collecting assembly according to claim 4, characterized in that: The supporting portion includes a first sub-portion and a second sub-portion, the first sub-portion is connected to the positive current collecting disk, the second sub-portion is arranged on a side of the first sub-portion away from the positive current collecting disk, and the second sub-portion protrudes along a first direction relative to the first sub-portion for fitting with the shell, and the first direction is the thickness direction of the positive current collecting disk.

6. The current collecting assembly according to claim 4, characterized in that: The part of the negative electrode current collecting disc embedded in the insulating part is provided with a fixing hole, the insulating part includes an insulator part and a fixing column, the insulator part is provided with a groove on the side facing the negative electrode current collecting disc, the negative electrode current collecting disc is embedded in the groove, the fixing column is located in the groove and inserted in the fixing hole.

7. A battery cell, characterized in that: include: The shell comprises a shell body and an end cover, wherein the end cover comprises a cover body and a pole insulated from each other, and the cover body is electrically connected to the shell body; An electrode assembly is disposed in the housing, wherein the electrode assembly has a positive electrode tab and a negative electrode tab, wherein the positive electrode tab and the negative electrode tab are respectively located on one side of the electrode assembly close to the end cap; as well as The current collecting assembly according to any one of claims 1 to 6, wherein the current collecting assembly is arranged between the electrode assembly and the end cover, the positive current collecting disk of the current collecting assembly is electrically connected to the positive electrode tab and the electrode column, respectively, and the negative current collecting disk of the current collecting assembly is electrically connected to the negative electrode tab and the shell body, respectively.

8. The battery cell according to claim 7, characterized in that: The projection of the positive electrode tab on the cover body along the thickness direction of the cover body overlaps with the projection of the positive electrode current collecting plate on the cover body along the thickness direction of the cover body; And / or, a projection of the negative electrode tab on the cover body along the thickness direction of the cover body overlaps with a projection of the negative electrode current collecting plate on the cover body along the thickness direction of the cover body.

9. The battery cell according to claim 8, characterized in that: The area of ​​the projection of the negative electrode tab on the cover body along the thickness direction of the cover body is larger than the area of ​​the projection of the positive electrode tab on the cover body along the thickness direction of the cover body.

10. The battery cell according to claim 7, characterized in that: The pole is inserted into the cover body along the thickness direction of the cover body, the outer periphery of the pole is recessed to form a clamping groove, the clamping groove is arranged around the circumference of the pole, and the cover body is clamped in the clamping groove.

11. The battery cell according to claim 10, characterized in that: The slot includes a bottom wall, a first side wall and a second side wall, the second side wall is located on a side of the bottom wall away from the electrode assembly along the thickness direction of the cover body, the second side wall includes a side wall body and a supporting portion arranged on a side of the side wall body away from the bottom wall, the supporting portion protrudes relative to the side wall body toward a side close to the first side wall for supporting the cover body.

12. The battery cell according to claim 11, characterized in that: The cover body is recessed along its thickness direction from a side away from the electrode assembly to a side close to the electrode assembly to form a limiting groove, the limiting groove extends around the circumference of the pole, and the abutting portion is clamped in the limiting groove.

13. The battery cell according to any one of claims 7 to 12, characterized in that: The battery cell further includes a sealing member, the pole is provided with a liquid injection hole along the thickness direction of the cover body, and the sealing member is sealed in the liquid injection hole.

14. The battery cell according to claim 13, characterized in that: The sealing member includes an elastic sealing column and a fixed sealing cover, the injection hole includes a first hole segment and a second hole segment arranged in sequence along the thickness direction of the cover body, the first hole segment is located on a side of the second hole segment away from the electrode assembly, the elastic sealing column is arranged in the second hole segment, and the fixed sealing cover is fixedly arranged in the first hole segment.

15. The battery cell according to claim 14, characterized in that: The positive current collector disk includes a second disk body and a second adapter portion which are electrically connected to each other, the second disk body being respectively connected to the positive electrode ear and the insulating bracket, the second adapter portion being located on a side of the second disk body close to the pole along the thickness direction of the cover body, the second adapter portion being inserted into at least a portion of the second hole section and electrically connected to the pole, the positive current collector disk being provided with a through hole along the thickness direction of the cover body, the elastic sealing column being inserted into the through hole to seal the through hole.

16. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 7 to 15.

17. A vehicle, characterized in that: Comprising the battery of claim 16.

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