Battery cell, battery device and electric device

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a single battery, a battery device and a power utilization device.The single battery comprises a shell component, a pole component and an electrode component, the electrode component comprises an active material coating part and a conductive part, and the end, facing the active material coating part, of the pole component is provided with a first part and a second part; in the height direction of the active material coating part, the distance between the first part and the active material coating part is larger than the distance between the second part and the active material coating part, at least part of the conductive part is located between the first part and the active material coating part, and the conductive part is connected with the second part or the position, close to the second part, of the first part. In the technical scheme of the embodiment of the invention, the welding difficulty of the conductive part and the pole component can be reduced, the conductive part and the second part of the pole component can be conveniently welded and connected, the occupied space of the pole component in the shell component can be reduced, and the energy density of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery device technology is an important factor for their development.

[0003] In the battery monomer of the related art, there are problems such as difficulty in welding the tab and the pole, and low energy density. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power utilization device, which can balance the high energy density of the battery monomer and the convenience of welding the conductive part and the pole part.

[0005] In a first aspect, the present application provides a battery monomer, comprising: a shell part comprising a first shell wall; a pole part connected with the first shell wall; an electrode part accommodated in the shell part and comprising an active material coating part and a conductive part connected with the active material coating part; wherein one end of the pole part towards the active material coating part has a first part and a second part, in the height direction of the active material coating part, the distance between the first part and the active material coating part is greater than the distance between the second part and the active material coating part, the conductive part is at least partially located between the first part and the active material coating part, and the conductive part is connected with the second part or the position of the first part close to the second part.

[0006] In the technical scheme of the present application, by providing the first part and the second part at one end of the pole part towards the active material coating part, the distance between the first part and the active material coating part is greater than the distance between the second part and the active material coating part, on the one hand, the welding difficulty of the conductive part and the pole part can be reduced, and the connection of the conductive part and the second part of the pole part can be facilitated, on the other hand, the occupied space of the pole part in the shell part can be reduced, and the volume of the electrode part can be increased, so that the energy density of the battery monomer can be improved.

[0007] In some embodiments, the first part and the second part are connected through a transition part. In the above technical scheme, the transition part is connected between the first part and the second part, so that the structure of the one end of the pole part towards the active material coating part is complete, a part of the conductive part can be laid on the second part under the guidance of the transition part, the connection of the conductive part and the pole part can be facilitated, and a part of the conductive part can be accommodated between the first part and the active material coating part under the guidance of the transition part.

[0008] In some embodiments, the first accommodating groove is provided at one end of the pole part component facing the active material coating part, and a groove opening of the first accommodating groove is provided facing the active material coating part; the first accommodating groove comprises a first groove bottom wall and a first groove peripheral wall, the first groove bottom wall is provided opposite to the groove opening of the first accommodating groove, the first groove peripheral wall surrounds the first groove bottom wall, the first part is located at the first groove bottom wall, the transition part is located at the first groove peripheral wall, and the second part is located outside the groove opening of the first accommodating groove; a part of the conductive part is located in the first accommodating groove, and another part of the conductive part is located outside the groove opening of the first accommodating groove to be connected with the second part. In the above technical solution, by providing the first accommodating groove at one end of the pole part component facing the active material coating part, and by arranging the first part at the first groove bottom wall of the first accommodating groove, a part of the conductive part can be accommodated in the first accommodating groove, so that the energy density of the battery monomer can be improved, and the weight of the pole part component can be reduced; by arranging the second part outside the groove opening of the first accommodating groove, the arrangement of the welding tool is facilitated, so that the conductive part and the second part of the pole part component are welded and connected, thereby giving consideration to the high energy density of the battery monomer and the convenience of press fitting when the conductive part and the pole part component are welded. In addition, the first accommodating groove is simple to process, which is conducive to reducing production costs.

[0009] In some embodiments, the second part and the first accommodating groove are arranged in the width direction of the pole part component, and in the width direction of the pole part component, the transition part gradually approaches the active material coating part from the groove bottom wall to the second part. In the above technical solution, by arranging the transition part to gradually approach the active material coating part from the groove bottom wall to the second part, the conductive part can be smoothly extended from the first part to the second part, the probability of damage to the conductive part is reduced, the service life of the conductive part is prolonged, and the performance of the battery monomer is improved.

[0010] In some embodiments, the first part and the second part are arranged adjacent to each other and at an angle. In the above technical solution, by arranging the first part and the second part adjacent to each other and at an angle, a part of the conductive part can be laid on the first part of the pole part component, and one end of the conductive part extends to the second part of the pole part component, so that the conductive part and the pole part component are butt-welded. In addition, it is also conducive to shortening the length of the conductive part and reducing the wrinkling and damage of the conductive part due to excessive length when winding.

[0011] In some embodiments, the pole piece component has a second accommodating groove at one end thereof facing the active material coating portion, an opening of the second accommodating groove is arranged to face the active material coating portion; the second accommodating groove comprises a second groove bottom wall and a second groove peripheral wall, the second groove bottom wall is arranged opposite to the opening of the second accommodating groove, the second groove peripheral wall surrounds the second groove bottom wall, the first portion is located on the second groove bottom wall, the second portion is located on the second groove peripheral wall, and the conductive portion is at least partially located in the second accommodating groove to be connected with the second portion. In the above technical solution, by arranging the second accommodating groove at one end of the pole piece component facing the active material coating portion, and arranging the first portion on the second groove bottom wall of the second accommodating groove, a part of the conductive portion can be accommodated in the second accommodating groove, so that the energy density of the battery monomer can be improved, and the weight of the pole piece component can be reduced. By arranging the second portion on the second groove peripheral wall of the second accommodating groove, the butt welding of the conductive portion and the pole piece component can be facilitated, so that the high energy density of the battery monomer and the convenience of welding the conductive portion and the pole piece component are considered. In addition, the second accommodating groove is simple to process, which is conducive to reducing production costs.

[0012] In some embodiments, the pole piece component has a pole end face at one end thereof facing the active material coating portion, the pole end face comprises an inclined surface gradually away from the active material coating portion along a width direction of the pole piece component, and the first portion and the second portion are both located on the inclined surface. In the above technical solution, by arranging the pole end face to comprise the inclined surface, and arranging the first portion and the second portion on the inclined surface, the processing steps of the pole piece component can be simplified, and the processing difficulty can be reduced on the basis of improving the energy density of the battery monomer and the convenience of welding the conductive portion and the pole piece component.

[0013] In some embodiments, the pole piece component has a third accommodating groove at one end thereof facing the active material coating portion, an opening of the third accommodating groove is arranged to face the active material coating portion; the third accommodating groove comprises a first groove side wall and a second groove side wall arranged opposite to each other in a width direction of the pole piece component, the first groove side wall is gradually away from the second groove side wall in a direction close to the active material coating portion, the first portion and the second portion are both located on the first groove side wall, and the conductive portion is at least partially located in the third accommodating groove to be connected with the second portion. In the above technical solution, by arranging the third accommodating groove at one end of the pole piece component facing the active material coating portion, and arranging the first portion and the second portion on the first groove side wall of the third accommodating groove, a part of the conductive portion can be accommodated in the third accommodating groove, so that the energy density of the battery monomer can be improved, and the weight of the pole piece component can be reduced. In addition, the third accommodating groove is simple to process, which is conducive to reducing production costs.

[0014] In some embodiments, the pole part component has a receiving groove at one end of the active material coating part, and an opening of the receiving groove is arranged towards the active material coating part; wherein the conductive part is at least partially located in the receiving groove, the first part is located on a groove wall of the receiving groove, and the second part is located on the groove wall of the receiving groove or outside the opening of the receiving groove. In the above technical solution, by arranging the receiving groove at one end of the pole part component towards the active material coating part, a part of the conductive part can be accommodated in the receiving groove, so as to improve the energy density of the battery monomer, reduce the weight of the pole part component, and facilitate the arrangement of the welding tool, thereby facilitating the welding connection of the conductive part and the second part of the pole part component, thereby balancing the high energy density of the battery monomer and the convenience of press fitting when welding the conductive part and the pole part component. In addition, the processing of the receiving groove is simple, which is conducive to reducing the production cost.

[0015] In some embodiments, the depth of the receiving groove is H, the conductive part includes a converging part and a connecting part arranged in the extension direction thereof, the converging part is connected between the active material coating part and the connecting part, the connecting part is at least partially located in the receiving groove, and the thickness of the connecting part is h, H is greater than or equal to twice h. In the above technical solution, by limiting the depth H of the receiving groove to be greater than or equal to twice the thickness h of the connecting part, the receiving groove can accommodate more structures of the conductive part, effectively improve the energy density of the battery monomer, and greatly reduce the weight of the pole part component, which is conducive to the lightweight design of the battery monomer and the reduction of production cost.

[0016] In some embodiments, the second part is located outside the opening of the receiving groove, and the difference between the width of the second part and the width of the connecting part at the connecting position is greater than or equal to 5 mm. In the above technical solution, a setting position can be reserved for the welding tool, and the welding tool can press fit a part of the connecting part on the second part of the pole part component, so as to weld the connecting part and the second part together to form a connecting position with a certain size, thereby improving the connection reliability of the conductive part and the pole part component.

[0017] In some embodiments, the pole part component includes: a pole body, the first part and the second part are arranged on the pole body; an adapter structure, the adapter structure surrounds the pole body and is connected with the first shell wall; an insulating sealing structure, the insulating sealing structure is insulating and sealingly fitted between the adapter structure and the pole body; wherein the receiving groove is defined by the pole body, or the receiving groove is formed by the pole body and the insulating sealing structure. In the above technical solution, the receiving groove is formed by the pole body or the pole body and the insulating sealing structure, which can realize flexible arrangement of the pole part component.

[0018] In some embodiments, the second part is located outside the opening of the receiving groove, the width of the second part is L1, the width of one end of the pole body close to the active material coating part is L2, the depth of the receiving groove is H, and (L2-L1) 2Greater than or equal to H 2 In the above technical solution, by limiting the width L2 of the pole body near the one end of the active material coating part to satisfy the above range, more structures of the accommodation groove can accommodate the conductive part, effectively improve the energy density of the battery monomer, greatly reduce the weight of the pole part, facilitate the lightweight design of the battery monomer, and reduce the production cost.

[0019] In some embodiments, the pole part comprises: a pole body, the first part and the second part are arranged on the pole body; an adapter structure, the adapter structure surrounds the pole body and is connected with the first shell wall; an insulating sealing structure, the insulating sealing structure is insulatingly and sealingly fitted between the adapter structure and the pole body. In the above technical solution, since the insulating sealing structure is insulatingly and sealingly fitted between the adapter structure and the pole body, when the pole part is installed to the first shell wall and the adapter structure is connected with the first shell wall, no sealing member needs to be arranged between the adapter structure and the first shell wall, and no large sealing pressure needs to be applied to meet the compression degree of the sealing member, thereby reducing the stress of the first shell wall and protecting the shell part, thereby facilitating the reduction of the wall thickness of the shell part and reducing the material cost.

[0020] In some embodiments, the adapter structure comprises an adapter ring and a clamping piece, the adapter ring is arranged outside the clamping piece and is connected with the first shell wall, the clamping piece comprises: a first clamping part; a second clamping part, which is arranged opposite to the first clamping part in the thickness direction of the first shell wall, and the two together define a first clamping groove, the opening of the first clamping groove faces the pole body so that the first clamping groove clamps the pole body, and the insulating sealing structure is at least partially arranged between the pole body and the inner wall of the first clamping groove. In the above technical solution, the adapter structure is arranged to comprise the adapter ring and the clamping piece, the clamping piece is arranged to comprise the first clamping part and the second clamping part, the pole body can be clamped by the adapter structure, so that the pole body and the adapter structure are connected together, the first clamping part and the second clamping part are respectively located on at least two sides of the pole body, the movement of the pole body relative to the adapter structure can be limited, and the insulating sealing structure is at least partially clamped between the first clamping part and the pole body and between the second clamping part and the pole body, so that the insulating sealing structure can be insulated and sealed from the side of the pole body facing the accommodation cavity to the side of the pole body away from the accommodation cavity, thereby improving the insulating sealing effect.

[0021] In some embodiments, the first clamping part is connected to the side of the second clamping part away from the electrode part, and the pole part further comprises: an outer insulating piece, which at least partially covers the side of the first clamping part away from the first clamping groove. In the above technical solution, the arrangement of the outer insulating piece can separate the first clamping part and the busbar part, and insulate the adapter structure and the busbar part, and the first shell wall and the busbar part.

[0022] In some embodiments, the pole body comprises: a main body portion; an inner extension portion located at one side of the adapter structure close to the active material coating portion and connected with the main body portion; and an outer extension portion located at one side of the adapter structure away from the active material coating portion and connected with the main body portion; wherein the main body portion, the inner extension portion and the outer extension portion together define a second clamping groove, the opening of the second clamping groove faces the adapter structure so that the second clamping groove clamps the adapter structure, and the insulating sealing structure is at least partially arranged between the adapter structure and the inner wall of the second clamping groove. In the above technical solution, the pole body is provided with the main body portion, the inner extension portion and the outer extension portion, and the pole body can clamp the adapter structure, so that the pole body and the adapter structure can be connected together, and the insulating sealing structure can be arranged at the matching position of the adapter structure and the pole body, which is beneficial to insulate and seal the matching position of the adapter structure and the pole body in a shorter path, reduce the size of the insulating sealing structure, easily realize compression sealing of the insulating sealing structure, prevent the sealing from failure, and improve the sealing effect. Since the insulating sealing structure is at least partially clamped between the adapter structure and the inner extension portion and between the adapter structure and the outer extension portion, the insulating sealing structure can be insulated and sealed from the side of the main body portion facing the accommodating cavity to the side of the main body portion away from the accommodating cavity, thereby improving the insulating and sealing effect.

[0023] In some embodiments, the insulating sealing structure comprises: an inner insulating member at least partially arranged between the outer extension portion and the side of the adapter structure away from the electrode component; and a sealing member at least partially arranged between the inner extension portion and the side of the adapter structure close to the electrode component and in contact with the inner insulating member; wherein the adapter structure or the inner extension portion is provided with a positioning protrusion, and the sealing member has a positioning groove matched with the positioning protrusion. In the above technical solution, the positioning protrusion and the positioning groove are matched between the adapter structure or the inner extension portion and the sealing member, which can position the sealing member on one hand, reduce the probability of the sealing member from the installation position, improve the installation reliability of the sealing member, and increase the contact area between the sealing member and the adapter structure or the inner extension portion on the other hand, thereby improving the sealing reliability of the sealing member.

[0024] In some embodiments, the positioning protrusion is arranged at the side of the adapter structure close to the electrode component and located at the radial middle portion or the radial inner side of the adapter structure. In the above technical solution, the positioning protrusion is arranged at the side of the adapter structure close to the electrode component and located at the radial middle portion or the radial inner side of the adapter structure, which can reduce the processing difficulty of the positioning protrusion on one hand, and improve the production efficiency on the other hand, and can increase the contact area between the adapter structure and the sealing member, thereby improving the matching reliability of the adapter structure and the sealing member.

[0025] In some embodiments, the positioning protrusion is arranged on one side of the inner extension close to the adapter structure and is located radially outside the inner extension. In the technical scheme, by arranging the positioning protrusion on one side of the inner extension close to the adapter structure and radially outside the inner extension, the contact area between the pole post body and the sealing element can be increased, thereby improving the cooperation reliability of the pole post body and the sealing element.

[0026] In some embodiments, the conductive part includes an approaching part and a connecting part arranged in the extension direction thereof, the approaching part is connected to one end of the active material coating part toward the first shell wall, and the connecting part is connected to the pole post component; wherein the connecting part includes a first connecting part and a second connecting part, the first connecting part is connected between the approaching part and the second connecting part, the first connecting part is located between the first part and the approaching part, and the second connecting part is connected to the second part or a position close to the second part of the first part. In the technical scheme, the plurality of tab pieces are arranged adjacent to the root of the active material coating part to form the approaching part, which facilitates the first connecting part to be accommodated between the first part and the approaching part, is not prone to loosen, and also facilitates the second connecting part to be connected to the second part of the pole post component or a position close to the second part of the first part.

[0027] In some embodiments, the first connecting part includes a first bending segment and a second bending segment connected to each other, the first bending segment is connected to the approaching part and a first open slot is defined between the first bending segment and the approaching part, the second bending segment is connected to the second connecting part and a second open slot is defined between the second bending segment and the second connecting part, the openings of the first open slot and the second open slot are arranged at an included angle and are arranged in a thickness direction of the first shell wall. In the technical scheme, by bending the conductive part into the above form, on the one hand, the conductive part can play a better buffering role, and when the battery monomer is used in a vibration environment, the vibration can be absorbed to protect the electrode component and improve the reliability of the battery monomer, on the other hand, by providing the two open slots, the conductive part is regularly bent, and the bent part is not prone to be inserted into the inside of the active material coating part due to redundancy, thereby reducing the risk of short circuit of the battery monomer, and also improving the mutual interference and rubbing between the tab pieces in the conductive part, reducing the lithium precipitation phenomenon, and further improving the reliability of the battery monomer.

[0028] In some embodiments, the approaching part, the first connecting part and the second connecting part define a third open slot. In the technical scheme, by bending the conductive part into the above form, the conductive part can play a buffering role, and when the battery monomer is used in a vibration environment, the vibration can be absorbed to protect the electrode component and improve the reliability of the battery monomer, and the conductive part is not prone to be inserted into the inside of the active material coating part, thereby reducing the risk of short circuit of the battery monomer.

[0029] In some embodiments, the conductive part includes a tab, the tab includes a plurality of tab pieces arranged in a stack, the approaching part and the connecting part are formed by different parts of the tab. In the above technical solution, the tab is directly connected with the pole part, which can simplify the processing steps and improve the production efficiency of the battery cell.

[0030] In some embodiments, the plurality of tab pieces are approached and connected to form a second connecting part at a position away from the active material coating part, and the connecting structure of the plurality of tab pieces at the second connecting part is a long strip extending along the length direction of the pole part. In the above technical solution, by setting the connecting structure of the plurality of tab pieces at the second connecting part as a long strip, the connection reliability of the conductive part and the pole part can be improved.

[0031] In some embodiments, the conductive part includes a tab connected to one end of the active material coating part close to the first shell wall, and the tab includes a plurality of tab pieces arranged in a stack; a conductive piece connected between the tab and the pole body, the conductive piece forms at least part of the connecting part, and at least part of the tab forms the approaching part. In the above technical solution, by indirectly connecting the tab and the pole part through the conductive piece, the length of the tab can be shortened, and the problems such as wrinkling, bending and breaking of the tab piece can be improved. In addition, by flexibly designing the shape and material of the conductive piece, the connection difficulty of the conductive piece and the pole part can be reduced, and the connection convenience of the conductive piece and the pole part can be improved.

[0032] In some embodiments, the conductive piece has a slot, and the tab is at least partially inserted into the slot. In the above technical solution, the slot is used to limit the end of the tab away from the active material coating part, thereby improving the connection reliability of the tab and the conductive piece.

[0033] In some embodiments, the conductive piece includes a transition piece, the transition piece includes a plurality of transition foil pieces arranged in a stack and connected to each other, so that the transition piece is deformable. In the above technical solution, since the thickness of the plurality of transition foil pieces is small, the plurality of transition foil pieces are equivalent to multiple thin plates. The transition piece formed by the plurality of transition foil pieces is more easily bent than a transition piece formed in one piece, so that the transition piece and the tab can be bent as needed, so that the conductive part forms a predetermined shape, thereby meeting the design requirements.

[0034] In some embodiments, the shell part includes a shell body having an opening and a shell cover covering the opening; the first shell wall includes a wall body arranged opposite to the opening of the shell body, and / or the first shell wall includes the shell cover. In the above technical solution, the pole part can be arranged on the wall body opposite to the opening of the shell body, or the pole part can be arranged on the shell cover, so that the pole part can be arranged flexibly.

[0035] In a second aspect, the present application provides a battery device including the battery cell in the above embodiments.

[0036] The battery monomer can reduce production difficulty, improve production efficiency, and improve energy density of the battery device.

[0037] In a third aspect, the application provides a power utilization device including the battery monomer in the above embodiments, or including the battery device in the above embodiments.

[0038] In the technical solution of the embodiments of the application, the battery device can improve the performance of the power utilization device, and the power utilization device has a compact structure, which is beneficial to the structural design of the power utilization device.

[0039] The above description is only a summary of the technical solutions of the application, in order to enable the technical means of the application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more apparent and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several views that follow. In the drawings:

[0041] Figure 1 Structure diagram of a vehicle of some embodiments of the application;

[0042] Figure 2 Exploded view of a battery device of some embodiments of the application;

[0043] Figure 3 Structure diagram of a battery monomer of some embodiments of the application;

[0044] Figure 4 Top view of a battery monomer of some embodiments of the application;

[0045] Figure 5 Structure sectional view along line I-I in FIG. 1; Figure 4

[0046] Enlarged view of part A shown in FIG. 1; Figure 6 Figure 5 Structure sectional view of a battery monomer of some other embodiments of the application;

[0047] Figure 7 Enlarged view of part B shown in FIG. 1;

[0048] Figure 8 Figure 7 Enlarged view of part B shown in FIG. 1; ​​

[0049] Figure 9 Structural sectional view of a battery cell according to further embodiments of the application;

[0050] Figure 10 Enlarged view of section C shown in Figure 9

[0051] Figure 11 Structural sectional view of a battery cell according to further embodiments of the application;

[0052] Figure 12 Enlarged view of section D shown in Figure 11

[0053] Figure 13 Assembling schematic of a battery cell shown in Figure 5

[0054] Figure 14 Structural sectional view of a battery cell according to some embodiments of the application;

[0055] Figure 15 Enlarged view of section E shown in Figure 14

[0056] Figure 16 Structural sectional view of a battery cell according to further embodiments of the application;

[0057] Figure 17 Enlarged view of section F shown in Figure 16

[0058] Figure 18 Structural sectional view of a battery cell according to further embodiments of the application;

[0059] Figure 19 Enlarged view of section G shown in Figure 18

[0060] Figure 20 Structural sectional view of a battery cell according to further embodiments of the application;

[0061] Figure 21 Enlarged view of section H shown in Figure 20

[0062] Figure 22 Assembling schematic of a battery cell shown in Figure 14

[0063] Figure 23 Structural sectional view of a battery cell according to some embodiments of the application;

[0064] Figure 24 Structural sectional view of a battery cell according to further embodiments of the application;​​​​​​​​

[0065] Figure 25 Structural sectional view of a battery cell according to yet further embodiments of the present application;

[0066] Figure 26 Structural sectional view of a battery cell according to still further embodiments of the present application.

[0067] Reference signs in the detailed description of the embodiments are as follows:

[0068] Vehicle 1000;

[0069] Battery device 100; controller 200; motor 300;

[0070] Case 101; first case portion 1011; second case portion 1012;

[0071] Battery cell 102;

[0072] Housing member 1; housing body 11; opening 110; housing cover 12; first housing wall 13; mounting hole 131;

[0073] Pole member 2;

[0074] First accommodation groove 201; first groove bottom wall 2011; second groove peripheral wall 2012;

[0075] Second accommodation groove 202; second groove bottom wall 2021; second groove peripheral wall 2022;

[0076] Third accommodation groove 203; first groove side wall 2031; second groove side wall 2032;

[0077] Pole body 21; pole end face 210; first portion 211; second portion 212; transition portion 213; second clamping groove 2140; main body portion 2141; inner extension portion 2142; second positioning protrusion 21421; outer extension portion 2143; flange portion 215;

[0078] Adapter structure 22; adapter ring 221; clamping member 222; first clamping groove 2220; first clamping portion 2221; second clamping portion 2222; first positioning protrusion 2223;

[0079] Insulating sealing structure 23; inner insulating member 231; sealing member 232;

[0080] Outer insulating member 24;

[0081] Electrode member 3; electrode assembly 30;

[0082] Active material coating portion 31;

[0083] Conductive part 32; first open slot 3201; second open slot 3202; third open slot 3203; tab 321; tab end 3212; conductive piece 322; slot 3220; clamping section 3221; closing part 323; connecting part 324; first connecting part 3241; second connecting part 3242;

[0084] Pressure relief device 6; insulating film 7; insulating support 9. DETAILED DESCRIPTION

[0085] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0086] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0087] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0088] In this paper, "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0089] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0090] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0091] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 embodiments of the present application.

[0092] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0093] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0094] In the battery cell of the related art, the electrode part is first mounted in the case during assembly, and then the conductive part of the electrode part is welded with the pole part, and finally the pole part is mounted on the case.

[0095] When welding the conductive part of the electrode part and the pole part, in order to reduce the influence of the surrounding parts on the welding tool, and considering the requirements of the welding process, the welding position of the pole part needs to be arranged closer to the electrode part, or even most of the structure of the electrode part is inserted into the case, otherwise the welding of the conductive part of the electrode part and the pole part is difficult. However, if most of the structure of the electrode part is inserted into the case, it will occupy the internal space of the case, resulting in low energy density of the battery cell.

[0096] Therefore, in the battery cell of the related art, there are problems such as difficulty in welding the tab and the pole, and low energy density.

[0097] Therefore, in the embodiments of the present application, the first part and the second part are arranged at one end of the pole part towards the active material coating part, and the distance between the first part and the active material coating part is greater than the distance between the second part and the active material coating part. In this way, the welding of the conductive part and the first part of the pole part is facilitated, the welding difficulty is reduced, the space occupied by the pole part in the housing part is reduced, and the energy density of the battery monomer is improved.

[0098] The battery monomer disclosed in the embodiments of the present application can be used in a power consumption device using a battery device as a power supply or a variety of energy storage systems using a battery device as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0099] The following embodiments take a power consumption device of an embodiment of the present application as a vehicle 1000 for example for convenient description.

[0100] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of the vehicle 1000 of some embodiments of the present application. The vehicle 1000 can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or a range extended car, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0101] In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0102] Please refer to Figure 2 , Figure 2 is an exploded view of the battery device 100 of some embodiments of the present application. The battery device 100 includes a box body 101 and a battery monomer 102, and the battery monomer 102 is contained in the box body 101. Among them, the box body 101 is used to provide a containing space for the battery monomer 102, and the box body 101 can adopt various structures.

[0103] In some embodiments, the box 101 can include a first box part 1011 and a second box part 1012, the first box part 1011 and the second box part 1012 are mutually coverable, and the first box part 1011 and the second box part 1012 jointly define a containing space for containing the battery monomer 102. The second box part 1012 can be a hollow structure with one end open, and the first box part 1011 can be a plate-shaped structure, which is coverable on the open side of the second box part 1012 to jointly define the containing space with the second box part 1012; or the first box part 1011 and the second box part 1012 can both be hollow structures with one side open, and the open side of the first box part 1011 is coverable on the open side of the second box part 1012. Of course, the box 101 formed by the first box part 1011 and the second box part 1012 can have various shapes, such as a cylinder, a cuboid, etc.

[0104] In the battery device 100, the battery monomer 102 can be multiple, and the multiple battery monomers 102 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery monomers 102 are connected in series and in parallel. The multiple battery monomers 102 can be directly connected in series, in parallel, or in a mixed manner, and then the whole of the multiple battery monomers 102 is contained in the box 101; of course, the battery device 100 can also be that the multiple battery monomers 102 are first connected in series, in parallel, or in a mixed manner to form a battery device 100 module, and then the multiple battery device 100 modules are connected in series, in parallel, or in a mixed manner to form a whole, which is contained in the box 101. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery monomers 102.

[0105] Each battery monomer 102 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, a magnesium-ion battery, or a solid-state battery, but is not limited thereto. The battery monomer 102 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0106] Please refer to Figures 3-5 , Figure 3 for the structural schematic diagram of the battery monomer 102 of some embodiments of the present application; Figure 4 for the top view of the battery monomer 102 of some embodiments of the present application; Figure 5 for the structural sectional view along line I-I in Figure 4 The battery monomer 102 refers to the smallest unit constituting the battery device 100. As shown in Figure 3 and Figure 5 , the battery monomer 102 includes a shell component 1, a pole component 2, an electrode component 3, an electrolyte, and other functional components. The shell component 1 includes a shell cover 12 and a shell body 11.

[0107] The shell cover 12 refers to a component that covers the opening 110 of the shell body 11 to isolate the internal environment of the battery cell 102 from the external environment. Without limitation, the shape of the shell cover 12 can be adapted to the shape of the shell body 11 to fit the shell body 11. Optionally, the shell cover 12 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the shell cover 12 is not easily deformed when subjected to extrusion collision, so that the battery cell 102 can have higher structural strength, and the reliability can also be improved. The shell cover 12 can be provided with functional components such as the pole component 2. The pole component 2 can be used to electrically connect with the electrode component 3 for outputting or inputting the electric energy of the battery cell 102. In some embodiments, the shell cover 12 can also be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 102 reaches a threshold value. The material of the shell cover 12 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations. In some embodiments, an insulating piece can also be provided on the inner side of the shell cover 12, which can be used to isolate the electrical connection part 324 in the shell body 11 from the shell cover 12 to reduce the risk of short circuit. Exemplarily, the insulating piece can be plastic, rubber, etc.

[0108] The shell body 11 is a component used to fit the shell cover 12 to form the internal environment of the battery cell 102, wherein the formed internal environment can be used to accommodate the electrode component 3, the electrolyte and other components. The shell body 11 and the shell cover 12 can be independent components, and the opening 110 can be provided on the shell body 11, and the shell cover 12 is covered on the opening 110 to form the internal environment of the battery cell 102. Without limitation, the shell cover 12 and the shell body 11 can also be integrated, specifically, the shell cover 12 and the shell body 11 can form a common connecting surface before other components enter the shell, and when it is necessary to encapsulate the internal environment of the shell body 11, the shell cover 12 is covered on the shell body 11. The shell body 11 can be various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the shell body 11 can be determined according to the specific shape and size of the electrode component 3. The material of the shell body 11 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations.

[0109] The electrode component 3 includes an electrode assembly 30, which is a component in which an electrochemical reaction occurs in the battery cell 102. One or more electrode assemblies 30 can be contained within the casing body 11. The electrode assembly 30 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active material that constitute a main body of the electrode assembly 30, and portions without active material that each constitute a tab 321. The positive electrode tab 321 and the negative electrode tab 321 can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery device 100, the positive electrode active material and the negative electrode active material react with an electrolyte, and the tabs 321 are connected to the post component 2 to form a current loop. In the solid-state battery device 100, the electrolyte can be a solid electrolyte layer located between the positive and negative electrode sheets, and the separator described above can be omitted.

[0110] According to some embodiments of the present application, with reference to Figure 3 and Figure 5 , the casing component 1 includes a first casing wall 13, and the post component 2 is connected to the first casing wall 13.

[0111] The first casing wall 13 is a partial casing wall of the casing component 1, which can serve as a mounting carrier for the post component 2. The first casing wall 13 can be a partial casing wall of the casing body 11, a casing cover 12, or both.

[0112] The electrode component 3 is housed in the casing component 1, and includes an active material coated portion 31 and a conductive portion 32, with the conductive portion 32 connected to the active material coated portion 31. Figure 3 The width direction of the active material coated portion 31 is the X direction, Figure 3 and Figure 5 The thickness direction of the active material coated portion 31 is the Y direction, and the height direction of the active material coated portion 31 is the Z direction. The conductive portion 32 can be connected to one or both ends of the active material coated portion 31 in the height direction.

[0113] The conductive portion 32 connects the active material coated portion 31 and the post component 2, for outputting or inputting electrical energy of the battery cell 102. The connection between the conductive portion 32 and the post component 2 is not limited, and can include, but is not limited to, ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure fusion welding, brazing, cementing, etc.

[0114] Please refer again to Figure 5 and further refer to Figures 6-8 , Figure 6 is an enlarged view of part A shown in Figure 5 Figure 7 ​A structural sectional view of the battery cell 102 according to another embodiment of the present application; Figure 8 A structural sectional view of the battery cell 102 according to another embodiment of the present application; Figure 7 An enlarged view of part B shown in FIG. 6. The tab member 2 has a first portion 211 and a second portion 212 at one end thereof facing the active material coated portion 31. Specifically, the tab member 2 has a tab end surface 210 at one end thereof facing the active material coated portion 31, and the first portion 211 and the second portion 212 are located on the tab end surface 210.

[0115] In the height direction of the active material coated portion 31, the distance between the first portion 211 and the active material coated portion 31 is h1, and the distance between the second portion 212 and the active material coated portion 31 is h2, h1 is greater than h2, that is, the tab end surface 210 of the tab member 2 is not a planar structure perpendicular to the height direction of the active material coated portion 31. Therefore, the space between the first portion 211 of the tab member 2 and the active material coated portion 31 is greater than the space between the second portion 212 and the active material coated portion 31.

[0116] The conductive portion 32 is at least partially located between the first portion 211 and the active material coated portion 31. Since the first portion 211 of the tab member 2 is farther away from the electrode member 3, the space between the first portion 211 and the active material coated portion 31 can be used to accommodate most of the structure of the conductive portion 32, which can reduce the occupied space of the tab member 2 in the housing member 1, increase the volume of the electrode member 3, and improve the energy density of the battery cell 102.

[0117] The conductive portion 32 is connected to the second portion 212 or a position of the first portion 211 close to the second portion 212. Since the second portion 212 of the tab member 2 is closer to the electrode member 3, the second portion 212 or the position of the first portion 211 close to the second portion 212 can be used as the welding position of the tab member 2 and the conductive portion 32, which reduces the influence of other components around the tab member 2 on the welding tool (such as a welding pressure nozzle) on the housing member 1, and reduces the welding difficulty of the conductive portion 32 and the tab member 2.

[0118] Therefore, in the technical scheme of the embodiment of the present application, by providing the first portion 211 and the second portion 212 at one end of the tab member 2 facing the active material coated portion 31, the distance between the first portion 211 and the active material coated portion 31 is greater than the distance between the second portion 212 and the active material coated portion 31, which can reduce the welding difficulty of the conductive portion 32 and the tab member 2, facilitate the welding connection of the conductive portion 32 and the second portion 212 of the tab member 2, and on the other hand, can reduce the occupied space of the tab member 2 in the housing member 1, increase the volume of the electrode member 3, and thus improve the energy density of the battery cell 102.

[0119] Please refer again Figures 5-8 In some embodiments, the first part 211 and the second part 212 are connected by the transition part 213.

[0120] For example, the transition part 213 is perpendicular to the first part 211, and the transition part 213 is perpendicular to the second part 212. For example, the transition part 213 is inclined relative to the first part 211, and the transition part 213 is inclined relative to the second part 212. For example, the transition part 213 is perpendicular to the first part 211, and the transition part 213 is inclined relative to the second part 212. For example, the transition part 213 is inclined relative to the first part 211, and the transition part 213 is perpendicular to the second part 212. One end of the transition part 213 can be connected to the first part 211 in a circular arc transition, and the other end is connected to the second part 212 in a circular arc transition.

[0121] In some embodiments, the end surface of the pole part 2 towards the active material coating part 31 can be composed of three part regions arranged in the width direction thereof, specifically, the transition part 213 in the middle region, the first part 211 and the second part 212 in the two side regions, that is, the local height of the pole part 2 is thinned, thereby forming the first part 211 and the transition part 213 at the end of the pole part 2 towards the active material layer.

[0122] In some embodiments, the end surface of the pole part 2 towards the active material coating part 31 can be composed of three part regions arranged in the width direction thereof, specifically, the transition part 213 in the middle region, the first part 211 and the second part 212 in the two side regions, that is, the local height of the pole part 2 is thinned, thereby forming the first part 211 and the transition part 213 at the end of the pole part 2 towards the active material layer.

[0123] In the above technical solution, the transition part 213 is connected between the first part 211 and the second part 212, so that the end structure of the pole part 2 towards the active material coating part 31 is complete, so that part of the conductive part 32 can be laid on the second part 212 under the guidance of the transition part 213, facilitating the connection of the conductive part 32 and the pole part 2, and part of the conductive part 32 can be accommodated between the first part 211 and the active material coating part 31 under the guidance of the transition part 213.

[0124] Please refer again Figures 5-8 In some embodiments, the end of the pole part 2 towards the active material coating part 31 has a first accommodation groove 201, and the groove opening of the first accommodation groove 201 is arranged towards the active material coating part 31.

[0125] The first accommodating groove 201 comprises a first groove bottom wall 2011 and a first groove peripheral wall, the first groove bottom wall 2011 is arranged opposite to the groove opening of the first accommodating groove 201, the first groove peripheral wall surrounds the first groove bottom wall 2011, the first part 211 is located on the first groove bottom wall 2011, the transition part 213 is located on the first groove peripheral wall, the second part 212 is located outside the groove opening of the first accommodating groove 201, and a part of the conductive part 32 is located in the first accommodating groove 201 and another part is located outside the groove opening of the first accommodating groove 201 to be connected with the second part 212.

[0126] The first accommodating groove 201 is arranged at the end of the pole piece 2 towards the active material coating part 31, and the first part 211 is arranged on the first groove bottom wall 2011 of the first accommodating groove 201, so that at least part of the conductive part 32 can be accommodated in the first accommodating groove 201, for example, the bent part of the conductive part 32 can be accommodated in the first accommodating groove 201, thereby reducing the occupied space of the pole piece 2 in the shell part 1, improving the energy density of the battery monomer 102, reducing the weight of the pole piece 2, facilitating the lightweight design of the battery monomer 102, and reducing the production cost.

[0127] The second part 212 of the conductive part 32 and the pole piece 2 outside the groove opening of the first accommodating groove 201 are connected, which can reduce the influence of other parts around the pole piece 2 on the shell part 1 and the first accommodating groove 201 on the welding tool, facilitate the arrangement of the welding tool, and facilitate the press-fitting of the welding tool by arranging the second part 212 in a planar structure or a near-planar structure, thereby reducing the welding difficulty of the conductive part 32 and the pole piece 2 and facilitating the welding connection of the conductive part 32 and the pole piece 2.

[0128] Therefore, in the above technical solution, by arranging the first accommodating groove 201 at the end of the pole piece 2 towards the active material coating part 31 and arranging the first part 211 on the first groove bottom wall 2011 of the first accommodating groove 201, part of the conductive part 32 can be accommodated in the first accommodating groove 201, thereby improving the energy density of the battery monomer 102, reducing the weight of the pole piece 2, arranging the second part 212 outside the groove opening of the first accommodating groove 201 to facilitate the arrangement of the welding tool, and facilitating the welding connection of the conductive part 32 and the second part 212 of the pole piece 2, thereby balancing the high energy density of the battery monomer 102 and the convenience of press-fitting when welding the conductive part 32 and the pole piece 2. In addition, the first accommodating groove 201 is simple to process and is conducive to reducing production cost.

[0129] Please refer to Figure 5 and Figure 6In some embodiments, the second portion 212 and the first accommodating groove 201 are arranged in the width direction of the pole piece 2, and the transition portion 213 gradually approaches the active material coating portion 31 from the groove bottom wall to the second portion 212 in the width direction of the pole piece 2.

[0130] For example, the first portion 211 and the second portion 212 can both be perpendicular to the height direction of the active material coating portion 31, the transition portion 213 can be arranged to be inclined with respect to the first portion 211, and the transition portion 213 can be arranged to be inclined with respect to the second portion 212.

[0131] In the above technical solution, the transition portion 213 is arranged to gradually approach the active material coating portion 31 from the groove bottom wall to the second portion 212, so that the conductive portion 32 can be smoothly extended from the first portion 211 to the second portion 212, reducing the probability of damage to the conductive portion 32, which is conducive to prolonging the service life of the conductive portion 32 and improving the performance of the battery monomer 102.

[0132] Please refer to Figure 9 and Figure 10 , Figure 9 for the structure sectional view of the battery monomer 102 of another embodiment of the present application; Figure 10 for Figure 9 the enlarged view of the C part shown in FIG. 8. In some embodiments, the first portion 211 and the second portion 212 are arranged adjacent to each other and at an angle. For example, the first portion 211 and the second portion 212 can be arranged at a right angle or an obtuse angle, which is convenient to process.

[0133] In the above technical solution, the first portion 211 and the second portion 212 are arranged adjacent to each other and at an angle, so that a part of the conductive portion 32 can be laid on the first portion 211 of the pole piece 2, and one end of the conductive portion 32 extends to the second portion 212 of the pole piece 2, thereby facilitating butt welding of the conductive portion 32 and the pole piece 2. In addition, it is also conducive to shortening the length of the conductive portion 32 and reducing the wrinkling and damage of the conductive portion 32 due to excessive length during winding.

[0134] In the above technical solution, the first portion 211 and the second portion 212 are arranged adjacent to each other and at an angle, so that a part of the conductive portion 32 can be laid on the first portion 211 of the pole piece 2, and one end of the conductive portion 32 extends to the second portion 212 of the pole piece 2, thereby facilitating butt welding of the conductive portion 32 and the pole piece 2. In addition, it is also conducive to shortening the length of the conductive portion 32 and reducing the wrinkling and damage of the conductive portion 32 due to excessive length during winding.

[0135] Please refer to Figure 9 and Figure 10In some embodiments, the pole part 2 has a second accommodating groove 202 at one end thereof facing the active material coating part 31, and an opening of the second accommodating groove 202 is arranged towards the active material coating part 31.

[0136] The second accommodating groove 202 comprises a second groove bottom wall 2021 and a second groove peripheral wall 2022 2012, the second groove bottom wall 2021 is arranged opposite to the opening of the second accommodating groove 202, and the second groove peripheral wall 2022 2012 surrounds the second groove bottom wall 2021, the first part 211 is located on the second groove bottom wall 2021, the second part 212 is located on the second groove peripheral wall 2022 2012, and the conductive part 32 is at least partially located in the second accommodating groove 202 to be connected with the second part 212.

[0137] In some embodiments, the pole part 2 has a second accommodating groove 202 at one end thereof facing the active material coating part 31, and an opening of the second accommodating groove 202 is arranged towards the active material coating part 31. The first part 211 is arranged on the second groove bottom wall 2021 of the second accommodating groove 202. On one hand, the conductive part 32 can be at least partially accommodated in the second accommodating groove 202, for example, the bent part of the conductive part 32 can be accommodated in the second accommodating groove 202, so as to reduce the occupied space of the pole part 2 in the housing part 1, improve the energy density of the battery monomer 102, and on the other hand, the weight of the pole part 2 can be reduced, which is conducive to the lightweight design of the battery monomer 102 and reduces the production cost.

[0138] The conductive part 32 is connected with the second part 212 of the pole part 2 located on the second groove peripheral wall 2022 2012, which facilitates the butt welding of the conductive part 32 and the pole part 2, and reduces the welding difficulty of the conductive part 32 and the pole part 2.

[0139] Therefore, in the above technical solution, by arranging the second accommodating groove 202 at one end of the pole part 2 facing the active material coating part 31, and arranging the first part 211 on the second groove bottom wall 2021 of the second accommodating groove 202, a part of the conductive part 32 can be accommodated in the second accommodating groove 202, so as to improve the energy density of the battery monomer 102, and reduce the weight of the pole part 2. By arranging the second part 212 on the second groove peripheral wall 2022 2012 of the second accommodating groove 202, the butt welding of the conductive part 32 and the pole part 2 can be facilitated, so as to balance the high energy density of the battery monomer 102 and the convenience of welding the conductive part 32 and the pole part 2. In addition, the second accommodating groove 202 is simple to process and is conducive to reducing the production cost.

[0140] Please refer to Figure 11 and Figure 12In some embodiments, the pole piece 2 has a pole piece end surface 210 at one end thereof facing the active material coating portion 31, the pole piece end surface 210 including a slope gradually away from the active material coating portion 31 along a width direction of the pole piece 2, and the first portion 211 and the second portion 212 are both located on the slope.

[0141] In some embodiments, the pole piece 2 has a pole piece end surface 210 at one end thereof facing the active material coating portion 31, the pole piece end surface 210 including a slope gradually away from the active material coating portion 31 along a width direction of the pole piece 2, and the first portion 211 and the second portion 212 are both located on the slope.

[0142] In the above technical solution, by setting the pole piece end surface 210 to include a slope, and forming the first portion 211 and the second portion 212 on the slope, the processing steps of the pole piece 2 can be simplified and the processing difficulty can be reduced on the basis of improving the energy density of the battery monomer 102 and the convenience of welding the conductive portion 32 and the pole piece 2.

[0143] Please refer again to Figure 11 and Figure 12 In some embodiments, the pole piece 2 has a third accommodation groove 203 at one end thereof facing the active material coating portion 31, and a groove opening of the third accommodation groove 203 faces the active material coating portion 31.

[0144] The third accommodation groove 203 includes a first groove side wall 2031 and a second groove side wall 2032, the first groove side wall 2031 and the second groove side wall 2032 are oppositely arranged in a width direction of the pole piece 2, the first groove side wall 2031 gradually away from the second groove side wall 2032 in a direction close to the active material coating portion 31, the first portion 211 and the second portion 212 are both located on the first groove side wall 2031, and the conductive portion 32 is at least partially located in the third accommodation groove 203 to be connected with the second portion 212. That is, the first portion 211 and the second portion 212 are both located in the third accommodation groove 203, and the second portion 212 is closer to the groove opening of the third accommodation groove 203 than the first portion 211.

[0145] The third accommodating groove 203 is arranged at the end of the pole part 2 facing the active material coating part 31, and the first part 211 is arranged at the first groove side wall 2031 of the third accommodating groove 203. On the one hand, the conductive part 32 can be at least partially accommodated in the third accommodating groove 203, for example, the bent part of the conductive part 32 can be accommodated in the third accommodating groove 203, so as to reduce the occupied space of the pole part 2 in the shell part 1, improve the energy density of the battery monomer 102, and on the other hand, the weight of the pole part 2 can be reduced, which is beneficial to the lightweight design of the battery monomer 102 and reduces the production cost.

[0146] The second part 212 is arranged at the first groove side wall 2031 of the third accommodating groove 203. Since the second part 212 is closer to the groove opening of the third accommodating groove 203 than the first part 211, on the one hand, the influence of other parts around the pole part 2 on the shell part 1 and the third accommodating groove 203 on the welding tool can be reduced, and the welding tool is arranged conveniently, and on the other hand, the second part 212 can be arranged as a plane structure or a near-plane structure with a certain slope, so as to facilitate the press-fitting of the welding tool, thereby reducing the welding difficulty of the conductive part 32 and the pole part 2, and facilitating the welding connection of the conductive part 32 and the pole part 2.

[0147] Therefore, in the above technical solution, by arranging the third accommodating groove 203 at the end of the pole part 2 facing the active material coating part 31, and arranging the first part 211 and the second part 212 at the first groove side wall 2031 of the third accommodating groove 203, a part of the conductive part 32 can be accommodated in the third accommodating groove 203, so as to improve the energy density of the battery monomer 102, and also reduce the weight of the pole part 2, and facilitate the arrangement of the welding tool, thereby facilitating the welding connection of the conductive part 32 and the second part 212 of the pole part 2, so as to balance the high energy density of the battery monomer 102 and the convenience of press-fitting when the conductive part 32 and the pole part 2 are welded. In addition, the third accommodating groove 203 is simple to process and is beneficial to reducing the production cost.

[0148] Please refer to Figure 5 and Figure 6 In some embodiments, the end of the pole part 2 facing the active material coating part 31 has an accommodating groove, and the groove opening of the accommodating groove faces the active material coating part 31.

[0149] In the above technical solution, the conductive part 32 is at least partially located in the accommodating groove, the first part 211 is located at the groove wall of the accommodating groove, and the second part 212 is located at the groove wall of the accommodating groove or outside the groove opening of the accommodating groove.

[0150] In the above technical solution, by arranging the accommodating groove at the end of the pole part 2 facing the active material coating part 31, a part of the conductive part 32 can be accommodated in the accommodating groove, so that the energy density of the battery monomer 102 can be improved, the weight of the pole part 2 can be reduced, and the arrangement of the welding tool is facilitated, so that the conductive part 32 and the second part 212 of the pole part 2 are welded and connected, thereby balancing the high energy density of the battery monomer 102 and the convenience of press fitting when the conductive part 32 and the pole part 2 are welded. In addition, the processing of the accommodating groove is simple, which is beneficial to reduce the production cost.

[0151] Please refer again to Figure 6 In some embodiments, the conductive part 32 includes a converging part 323 and a connecting part 324, the converging part 323 and the connecting part 324 are arranged in the extension direction of the conductive part 32, the converging part 323 is connected between the active material coating part 31 and the connecting part 324, and the connecting part 324 is at least partially located in the accommodating groove.

[0152] The thickness of the connecting part 324 is h, which refers to the thickness of the part after the multiple tabs 321 of the conductive part 32 are gathered and stacked. The depth of the accommodating groove is H, which refers to the size of the groove bottom wall and the groove opening in the height direction of the pole part 2.

[0153] The depth H of the accommodating groove is greater than or equal to twice the thickness h of the connecting part 324. For example, the depth H of the accommodating groove can be equal to 2h, 2.5h, 3h, etc.

[0154] If the depth H of the accommodating groove is too small, it is difficult to accommodate more structures of the conductive part 32, so it is difficult to improve the energy density of the battery monomer 102.

[0155] In the above technical solution, by limiting the depth H of the accommodating groove to be greater than or equal to twice the thickness h of the connecting part 324, the accommodating groove can accommodate more structures of the conductive part 32, effectively improve the energy density of the battery monomer 102, and greatly reduce the weight of the pole part 2, which is beneficial to the lightweight design of the battery monomer 102 and the reduction of production cost.

[0156] Please refer again to Figure 6 In some embodiments, the second part 212 is located outside the groove opening of the accommodating groove, and the difference between the width of the second part 212 and the width of the connecting part 324 at the connecting position of the connecting part 324 and the second part 212 is greater than or equal to 5mm. That is, the connecting part 324 of the conductive part 32 and the second part 212 are welded and connected to form a weld at the connecting position of the two, and the difference between the width of the second part 212 and the width of the weld is greater than or equal to 5mm.

[0157] The width of the second portion 212 refers to the dimension of the second portion 212 in the width direction of the pole piece 2, and the width of the connecting position (i.e., the welding seam) refers to the dimension of the connecting position in the width direction of the pole piece 2.

[0158] In this way, a setting position is reserved for the welding tool, which facilitates the welding tool to press-fit a part of the connecting portion 324 on the second portion 212 of the pole piece 2, so that the connecting portion 324 and the second portion 212 can be welded together to form a connecting position with a certain size, thereby improving the connection reliability of the conductive portion 32 and the pole piece 2.

[0159] Please refer again to Figure 5 and Figure 6 In some embodiments, the pole piece 2 includes a pole body 21, and the first portion 211 and the second portion 212 are arranged on the pole body 21.

[0160] The pole body 21 can be prepared by stamping or extrusion process, which is mature and low in cost, and is conducive to improving the structural strength of the pole body 21.

[0161] For example, when the pole piece 2 is a negative electrode, the pole body 21 can be a copper-aluminum composite, which can include an aluminum part and a copper part. The aluminum part is arranged on the side of the copper part away from the active material coating portion 31, which is easy to form a reliable connection with the aluminum current collector, and the copper part is easy to connect with the copper foil tab 321 of the negative electrode. When the pole piece 2 is a positive electrode, the pole body 21 can be an aluminum material, which is easy to form a reliable connection with the aluminum current collector, and is also easy to connect with the aluminum foil tab 321 of the positive electrode.

[0162] The pole piece 2 further includes an adapter structure 22, which surrounds the pole body 21 and is connected with the first shell wall 13. The pole body 21 can be installed on the first shell wall 13 through the adapter structure 22, which facilitates the installation of the pole body 21.

[0163] The pole piece 2 further includes an insulating sealing structure 23, which is insulating and sealingly fitted between the adapter structure 22 and the pole body 21. By arranging the insulating sealing structure 23, the insulating and sealing effect between the pole body 21 and the adapter structure 22 can be better improved, thereby improving the reliability of the battery monomer 102.

[0164] For example, the accommodation groove is defined by the pole body 21. That is, a recess can be arranged on the end surface of the pole body 21 facing the electrode component 3, thereby forming the accommodation groove.

[0165] For example, the accommodation groove is formed by the pole body 21 and the insulating sealing structure 23. Specifically, at least a portion of the insulating sealing structure 23 towards the one end of the electrode component 3 can protrude beyond the surface of the one end of the pole body 21 towards the electrode component 3, so as to define the accommodation groove with the insulating sealing structure 23 and the pole body 21.

[0166] In the above technical solution, the pole body 21 or the pole body 21 and the insulating sealing structure 23 are used to form the accommodation groove, so that the pole component 2 can be flexibly arranged.

[0167] Please refer again to Figure 6 In some embodiments, the second portion 212 is located outside the slot of the accommodation groove, and the width of the second portion 212 is L1, where the width of the second portion 212 refers to the size of the second portion 212 in the width direction of the pole body 21. The width of the one end of the pole body 21 close to the active material coating part 31 is L2. The depth of the accommodation groove is H. Here, the depth of the accommodation groove refers to the size of the bottom wall and the slot of the accommodation groove in the height direction of the pole component 2.

[0168] Wherein, (L2-L1) 2 is greater than or equal to three times H. 2

[0169] If the width L2 of the one end of the pole body 21 close to the active material coating part 31 is too small, so that the width of the accommodation groove is too small, it is difficult to accommodate more structures of the conductive part 32, and thus it is difficult to improve the energy density of the battery monomer 102.

[0170] In the above technical solution, by limiting the width L2 of the one end of the pole body 21 close to the active material coating part 31 to meet the above range, the accommodation groove can accommodate more structures of the conductive part 32, effectively improve the energy density of the battery monomer 102, and also greatly reduce the weight of the pole component 2, which is conducive to the lightweight design of the battery monomer 102 and reduces the production cost.

[0171] Please refer again to Figures 5-12 In some embodiments, the pole component 2 comprises: a pole body 21 and a switching structure 22, the first portion 211 and the second portion 212 are arranged on the pole body 21, and the switching structure 22 surrounds the pole body 21 and is connected with the first shell wall 13.

[0172] ​Specifically, the first shell wall 13 is provided with a mounting hole 131, and the adapter structure 22 surrounds the pole body 21 along the circumference of the mounting hole 131, so that the adapter structure 22 can connect the pole body 21 and the first shell wall 13 in the outer peripheral area of the pole body 21. The pole part 2 has a simple structure and is easy to process. Moreover, since the pole part 2 includes the pole body 21 and the adapter structure 22, the shape and size of the pole body 21 and the shape and size of the adapter structure 22 can be designed separately based on different factors, so as to flexibly adapt to the connection requirements of different forms of the shell part 1 and the electrode part 3, and increase the application range of the pole part 2.

[0173] The connection mode of the adapter structure 22 and the first shell wall 13 is not limited, for example, welding, riveting, punching, bonding, etc.

[0174] The pole part 2 further includes an insulating and sealing structure 23 which is insulatingly and sealingly fitted between the adapter structure 22 and the pole body 21.

[0175] The insulating and sealing structure 23 insulates and seals the fitting position of the adapter structure 22 and the pole body 21, which not only can reduce the probability of electric conduction short circuit between the pole body 21 and the adapter structure 22, but also can make the fitting position of the adapter structure 22 and the pole body 21 in a sealed state, so as to isolate the inside and outside of the shell part 1 after the adapter structure 22 is connected with the first shell wall 13, reduce the risk of leakage of the electrolyte in the shell part 1 to the outside of the shell part 1 from the fitting position of the adapter structure 22 and the pole body 21, and reduce the risk of liquid or dust outside the shell part 1 entering the shell part 1 from the fitting position of the adapter structure 22 and the pole body 21, thereby improving the reliability of the battery monomer 102.

[0176] In the above technical solution, since the insulating and sealing structure 23 is insulatingly and sealingly fitted between the adapter structure 22 and the pole body 21, when the pole part 2 is installed on the first shell wall 13 and the adapter structure 22 is connected with the first shell wall 13, no sealing member 232 is needed between the adapter structure 22 and the first shell wall 13, and no large sealing pressure needs to be applied to meet the compression degree of the sealing member 232, so as to reduce the stress of the first shell wall 13 and protect the shell part 1, thereby facilitating the reduction of the wall thickness of the shell part 1 and the reduction of the material cost.

[0177] Please refer to Figure 5 and Figure 6 In some embodiments, the adapter structure 22 includes an adapter ring 221 and a clamping piece 222, the adapter ring 221 is annularly arranged on the outside of the clamping piece 222, and the adapter ring 221 is connected with the first shell wall 13.

[0178] The clamping member 222 comprises a first clamping portion 2221 and a second clamping portion 2222, the second clamping portion 2222 is arranged opposite to the first clamping portion 2221 in the thickness direction of the first shell wall 13, and the first clamping portion 2221 and the second clamping portion 2222 jointly define a first clamping groove 2220, the opening of the first clamping groove 2220 faces the pole body 21, so that the first clamping groove 2220 clamps the pole body 21, and the insulating sealing structure 23 is at least partially arranged between the pole body 21 and the inner wall of the first clamping groove 2220.

[0179] In the above technical solution, the adapter structure 22 is arranged to comprise the adapter ring 221 and the clamping member 222, the clamping member 222 is arranged to comprise the first clamping portion 2221 and the second clamping portion 2222, the pole body 21 can be clamped by the adapter structure 22, so that the pole body 21 and the adapter structure 22 are connected together, because the first clamping portion 2221 and the second clamping portion 2222 are respectively located on at least two sides of the pole body 21, the movement of the pole body 21 relative to the adapter structure 22 can be limited, at least part of the insulating sealing structure 23 is clamped between the first clamping portion 2221 and the pole body 21, and between the second clamping portion 2222 and the pole body 21, the insulating sealing structure 23 can be insulated and sealed from the side of the pole body 21 facing the accommodating cavity to the side of the pole body 21 away from the accommodating cavity, so as to improve the insulating and sealing effect.

[0180] Please refer to Figure 5 and Figure 6 In some embodiments, the first clamping portion 2221 is connected to the side of the second clamping portion 2222 away from the electrode component 3, and the pole component 2 further comprises an outer insulating member 24 covering at least part of the side of the first clamping portion 2221 away from the first clamping groove 2220.

[0181] Exemplarily, the battery device 100 comprises a busbar component located outside the battery cell 102, and the pole component 2 is connected with the busbar component to form an electrical conduction, so that a plurality of battery cells 102 can be connected through the busbar component.

[0182] The arrangement of the outer insulating member 24 can separate the first clamping portion 2221 and the busbar component, so as to insulate between the adapter structure 22 and the busbar component, and between the first shell wall 13 and the busbar component.

[0183] In some embodiments, the pole component 2 further comprises an inner insulating member 231, the inner insulating member 231 is located in the first clamping groove 2220, and the inner insulating member 231 is located between the inner wall of the clamping member 222 and the pole body 21. That is, the inner insulating member 231 is clamped between the pole body 21 and the groove wall of the first clamping groove 2220, so as to realize the insulation between the pole body 21 and the adapter structure 22, so that the pole component 2 itself has self-insulation, facilitating the installation and cooperation of the pole component 2 and the first shell wall 13, and saving installation time and cost.

[0184] The pole part 2 further comprises a sealing member 232 arranged between the second clamping portion 2222 and the pole body 21. The sealing member 232 can be made of a material having both sealing and insulating properties, for example, an elastic rubber member, so that the sealing requirement can be met by the design of the shape and position of the sealing member 232.

[0185] In the above technical solution, the sealing member 232 arranged between the second clamping portion 2222 and the pole body 21 can realize the sealing between the pole body 21 and the adapter structure 22, so that the pole part 2 itself has self-sealing property, facilitating the installation and cooperation of the pole part 2 and the first shell wall 13, and saving the installation time and cost.

[0186] For example, referring to Figure 5 and Figure 6 , the peripheral wall of the pole body 21 has a flange portion 215, the first clamping groove 2220 clamps the flange portion 215, and the insulating sealing structure 23 is at least partially arranged between the flange portion 215 and the inner wall of the first clamping groove 2220. Specifically, the inner insulating member 231 is at least partially arranged on the side of the first clamping portion 2221 close to the electrode part 3 and the side of the flange portion 215 away from the electrode part 3, the sealing member 232 is at least partially arranged on the side of the second clamping portion 2222 away from the electrode part 3 and the side of the flange portion 215 close to the electrode part 3, the outer insulating member 24 is arranged on the side of the first clamping portion 2221 away from the flange portion 215, and the inner insulating member 231 is connected between the outer insulating member 24 and the sealing member 232.

[0187] For example, referring to Figure 13 , Figure 13 For example, referring to Figure 5 , the assembly schematic diagram of the battery cell 102 is shown.

[0188] In the assembly of the battery cell 102, a plurality of electrode assemblies 30 are stacked along the thickness direction of the electrode assembly 30, the plurality of electrode assemblies 30 are stacked and pre-welded in the same polarity of the plurality of layers of the tab 321, to form the electrode part 3, then the electrode part 3 is assembled into the shell body 11, so that the conductive part 32 is arranged outside the mounting hole 131 on the first shell wall 13, then a part of the conductive part 32 is arranged on the second portion 212 of the pole part 2 for welding, after welding, a part of the conductive part 32 is arranged in the accommodating groove, and finally the pole part 2 connected with the conductive part 32 is arranged at the mounting hole 131 of the first shell wall 13, the adapter structure 22 and the first shell wall 13 are welded and fixed, to realize the sealing of the battery cell.

[0189] For example, referring to Figure 14 and Figure 15In some embodiments, the pole body 21 comprises a main body portion 2141, an inner extension portion 2142 located at the side of the adapter structure 22 close to the active material coated portion 31 and connected to the main body portion 2141, and an outer extension portion 2143 located at the side of the adapter structure 22 away from the active material coated portion 31 and connected to the main body portion 2141.

[0190] The main body portion 2141, the inner extension portion 2142 and the outer extension portion 2143 together define a second clamping groove 2140, the opening of which faces the adapter structure 22 so that the second clamping groove 2140 clamps the adapter structure 22, and the insulation sealing structure 23 is at least partially arranged between the adapter structure 22 and the inner wall of the second clamping groove 2140.

[0191] In the above technical solution, the pole body 21 is provided with the main body portion 2141, the inner extension portion 2142 and the outer extension portion 2143, so that the pole body 21 can clamp the adapter structure 22, thereby connecting the pole body 21 and the adapter structure 22 together, and the insulation sealing structure 23 can be arranged at the mating position of the adapter structure 22 and the pole body 21, which is conducive to insulating and sealing the mating position of the adapter structure 22 and the pole body 21 in a shorter path, reducing the size of the insulation sealing structure 23, and facilitating compression sealing and improving the sealing effect.

[0192] Since the insulation sealing structure 23 is at least partially clamped between the adapter structure 22 and the inner extension portion 2142 and between the adapter structure 22 and the outer extension portion 2143, the insulation sealing structure 23 can be insulated and sealed from the side of the main body portion 2141 facing the accommodating cavity to the side away from the accommodating cavity, thereby improving the insulation and sealing effect.

[0193] Please refer again to Figure 14 and Figure 15 In some embodiments, the insulation sealing structure 23 comprises an inner insulation member 231 at least partially arranged between the outer extension portion 2143 and the side of the adapter structure 22 away from the electrode component 3.

[0194] The insulation sealing structure 23 further comprises a sealing member 232 at least partially arranged between the inner extension portion 2142 and the side of the adapter structure 22 close to the electrode component 3, and the sealing member 232 is in contact with the inner insulation member 231.

[0195] Further refer to Figures 16-21 , Figure 16 a structure sectional view of the battery cell 102 of another embodiment of the present application; Figure 17 is Figure 16 an enlarged view of the F portion shown inFigure 18 A structural sectional view of the battery cell 102 according to some embodiments of the present application; Figure 19 A structural sectional view of the battery cell 102 according to some embodiments of the present application; Figure 18 An enlarged view of the G part shown in FIG. 8. The adapter structure 22 is provided with a positioning protrusion, and the sealing member 232 has a positioning groove matched with the positioning protrusion.

[0196] For example, the positioning protrusion includes a first positioning protrusion 2223 provided on the adapter structure 22, and the side of the sealing member 232 facing the adapter structure 22 has a first positioning groove matched with the first positioning protrusion 2223. On the one hand, the adapter structure 22 can be used to limit the sealing member 232, reducing the probability of the sealing member 232 coming off the adapter structure 22. On the other hand, the contact area between the sealing member 232 and the adapter structure 22 is increased, improving the connection sealing between the sealing member 232 and the adapter structure 22.

[0197] For example, the positioning protrusion includes a first positioning protrusion 2223 provided on the adapter structure 22, and the side of the sealing member 232 facing the adapter structure 22 has a first positioning groove matched with the first positioning protrusion 2223. On the one hand, the adapter structure 22 can be used to limit the sealing member 232, reducing the probability of the sealing member 232 coming off the adapter structure 22. On the other hand, the contact area between the sealing member 232 and the adapter structure 22 is increased, improving the connection sealing between the sealing member 232 and the adapter structure 22. Figure 20 Figure 21 For example, the positioning protrusion includes a first positioning protrusion 2223 provided on the adapter structure 22, and the side of the sealing member 232 facing the adapter structure 22 has a first positioning groove matched with the first positioning protrusion 2223. On the one hand, the adapter structure 22 can be used to limit the sealing member 232, reducing the probability of the sealing member 232 coming off the adapter structure 22. On the other hand, the contact area between the sealing member 232 and the adapter structure 22 is increased, improving the connection sealing between the sealing member 232 and the adapter structure 22. Figure 20 A structural sectional view of the battery cell 102 according to some embodiments of the present application; Figure 21 A structural sectional view of the battery cell 102 according to some embodiments of the present application; Figure 20 An enlarged view of the H part shown in FIG. 9. The inner extension 2142 is provided with a positioning protrusion, and the sealing member 232 has a positioning groove matched with the positioning protrusion.

[0198] For example, the positioning protrusion includes a second positioning protrusion 21421 provided on the inner extension 2142 of the pole body 21, and the side of the sealing member 232 facing the inner extension 2142 has a second positioning groove matched with the second positioning protrusion 21421. On the one hand, the pole body 21 can be used to limit the sealing member 232, reducing the probability of the sealing member 232 coming off the pole body 21. On the other hand, the contact area between the sealing member 232 and the pole body 21 is increased, improving the connection sealing between the sealing member 232 and the pole body 21.

[0199] In the above technical solutions, the adapter structure 22 or the inner extension 2142 and the sealing member 232 are matched through the positioning protrusion and the positioning groove. On the one hand, the sealing member 232 can be limited, reducing the probability of the sealing member 232 coming off the installation position and improving the installation reliability of the sealing member 232. On the other hand, the contact area between the sealing member 232 and the adapter structure 22 or the inner extension 2142 is increased, improving the sealing reliability of the sealing member 232.

[0200] In some embodiments, the positioning protrusion is provided on the side of the adapter structure 22 close to the electrode component 3 and located in the radial middle or the radial inner side of the adapter structure 22.

[0201] For example, as shown in FIG. 10, Figure 16 ​And Figure 17 As shown in the figure, in the embodiment, the inner insulation 231 comprises a first insulation part and a second insulation part, the first insulation part is a bent structure, one part of the first insulation part is arranged between the side of the outer extension 2143 close to the electrode component 3 and the side of the adapter structure 22 away from the electrode component 3, and the other part is arranged between the radial outer side of the main body 2141 and the radial inner side of the adapter structure 22; the second insulation part is at least partially arranged between the side of the inner extension 2142 away from the electrode component 3 and the side of the adapter structure 22 close to the electrode component 3; the sealing member 232 is a bent structure and is arranged between the first insulation part and the second insulation part, one part of the sealing member 232 is arranged between the radial outer side of the main body 2141 and the radial inner side of the adapter structure 22, and the other part is arranged between the side of the inner extension 2142 away from the electrode component 3 and the side of the adapter structure 22 close to the electrode component 3. The positioning protrusion is arranged at the radial inner side of the side of the adapter structure 22 close to the electrode component 3 to cooperate with the bending position of the sealing member 232.

[0202] For example, as shown in the figures, Figure 18 And Figure 19 As shown in the figure, in the embodiment, the inner insulation 231 is a bent structure, one part of the inner insulation 231 is arranged between the side of the outer extension 2143 close to the electrode component 3 and the side of the adapter structure 22 away from the electrode component 3, the other part is arranged between the radial outer side of the main body 2141 and the radial inner side of the adapter structure 22, and the other part is arranged between the side of the inner extension 2142 away from the electrode component 3 and the side of the adapter structure 22 close to the electrode component 3; the sealing member 232 is connected with or in contact with the inner insulation 231, and the sealing member 232 is at least partially arranged between the side of the inner extension 2142 away from the electrode component 3 and the side of the adapter structure 22 close to the electrode component 3. The positioning protrusion is arranged at the radial middle part of the side of the adapter structure 22 close to the electrode component 3 to cooperate with the sealing member 232.

[0203] In the above technical solution, by arranging the positioning protrusion at the side of the adapter structure 22 close to the electrode component 3 and at the radial middle part or the radial inner side of the adapter structure 22, on the one hand, the machining difficulty of the positioning protrusion can be reduced, which is conducive to improving the production efficiency, and on the other hand, the contact area between the adapter structure 22 and the sealing member 232 can be increased, thereby improving the cooperation reliability of the adapter structure 22 and the sealing member 232.

[0204] In some embodiments, the positioning protrusion is arranged at the side of the inner extension 2142 close to the adapter structure 22 and at the radial outer side of the inner extension 2142.

[0205] For example, as shown in the figures, Figure 20 And Figure 21As shown, in the embodiment, the inner insulating member 231 is in a bent structure, one part of the inner insulating member 231 is arranged between the side of the outer extension 2143 close to the electrode component 3 and the side of the adapter structure 22 away from the electrode component 3, another part is arranged between the radial outer side of the main body 2141 and the radial inner side of the adapter structure 22, and another part is arranged between the side of the inner extension 2142 away from the electrode component 3 and the side of the adapter structure 22 close to the electrode component 3; the sealing member 232 is in a bent structure, one part of the sealing member 232 is arranged between the side of the inner extension 2142 away from the electrode component 3 and the side of the adapter structure 22 close to the electrode component 3, and another part is arranged at the radial outer side of the inner extension 2142. The positioning protrusion is arranged at the radial outer side of the side of the inner extension 2142 away from the electrode component 3 to cooperate with the bending position of the sealing member 232.

[0206] In the above technical solution, by arranging the positioning protrusion at the side of the inner extension 2142 close to the adapter structure 22 and at the radial outer side of the inner extension 2142, the contact area of the pole body 21 and the sealing member 232 can be increased, thereby improving the cooperation reliability of the pole body 21 and the sealing member 232.

[0207] Please refer to Figure 22 , Figure 22 for Figure 14 the assembly schematic diagram of the battery monomer 102.

[0208] In the assembly of the battery monomer 102, a plurality of electrode assemblies 30 are stacked along the thickness direction of the electrode assembly 30, the plurality of electrode assemblies 30 are stacked and pre-welded in the same polarity of the plurality of layers of the tab 321, to form the electrode component 3, then the electrode component 3 is assembled into the shell body 11, with the movement of the electrode component 3 assembled into the shell body 11, the conductive part 32 is naturally penetrated to the outside of the mounting hole 131 on the first shell wall 13, then a part of the conductive part 32 is laid on the second part 212 of the pole component 2 for welding, after welding, a part of the conductive part 32 is placed in the accommodation groove, and finally the pole component 2 connected with the conductive part 32 is covered at the mounting hole 131 of the first shell wall 13, the adapter structure 22 and the first shell wall 13 are welded and fixed, to realize the sealing of the battery cell.

[0209] Please refer to Figures 5-8 , in some embodiments, the conductive part 32 includes the approaching part 323 and the connecting part 324 arranged in the extension direction thereof, the approaching part 323 is connected with one end of the active material coating part 31 toward the first shell wall 13, and the connecting part 324 is connected with the pole component 2.

[0210] The connecting portion 324 comprises a first connecting portion 3241 and a second connecting portion 3242, the first connecting portion 3241 is connected between the converging portion 323 and the second connecting portion 3242, the first connecting portion 3241 is located between the first portion 211 and the converging portion 323, and the second connecting portion 3242 is connected to the second portion 212 or a position close to the second portion 212 of the first portion 211.

[0211] Specifically, the conductive portion 32 comprises a plurality of tab pieces 321 stacked together, and the plurality of tab pieces 321 converge to each other adjacent to the root of the active material coating portion 31 to form a converging portion 323 in a triangular shape. The triangular shape can be an isosceles triangle, i.e., the apex angle of the triangular shape is centered with the middle position of the pole piece 2 in the width direction of the pole piece 2; in the width direction of the pole piece 2, the apex angle of the triangular shape can deviate from the middle position of the pole piece 2.

[0212] In the above technical solution, the plurality of tab pieces 321 converge to each other adjacent to the root of the active material coating portion 31 to form the converging portion 323, which facilitates the first connecting portion 3241 to be accommodated between the first portion 211 and the converging portion 323, and is not prone to looseness, and also facilitates the second connecting portion 3242 to be connected to the second portion 212 of the pole piece 2 or a position close to the second portion 212 of the first portion 211.

[0213] Please refer to Figure 5 and Figure 6 In some embodiments, the first connecting portion 3241 comprises a first bending segment and a second bending segment connected together, the first bending segment is connected to the converging portion 323 and a first open slot 3201 is defined therebetween, the second bending segment is connected to the second connecting portion 3242 and a second open slot 3202 is defined therebetween, the openings of the first open slot 3201 and the second open slot 3202 are arranged at an included angle and are spaced apart in the thickness direction of the first shell wall 13.

[0214] The conductive portion 32 is bent to form at least two open slots (including the first open slot 3201 and the second open slot 3202), the openings of the two open slots are directed in different directions, and the two open slots are spaced apart in the thickness direction of the first shell wall 13. For example, the openings of the two open slots are arranged in opposite directions, i.e., the openings of the two open slots are arranged at an obtuse angle, so that the conductive portion 32 can present a reciprocating and bending serpentine shape.

[0215] In the technical solution, the conductive part 32 is bent to form the above-mentioned shape. On the one hand, the conductive part 32 can play a better buffering role. When the battery monomer 102 is used in a vibration environment, the vibration can be absorbed to protect the electrode part 3 and improve the reliability of the battery monomer 102. On the other hand, the two open grooves are arranged to make the conductive part 32 regularly bent. The bent part is not easy to be inserted into the inside of the active material coating part 31 due to redundancy, thereby reducing the risk of short circuit of the battery monomer 102 and improving the mutual interference and rubbing between the tabs 321 of the conductive part 32, reducing the lithium precipitation phenomenon, and further improving the reliability of the battery monomer 102.

[0216] Please refer to Figure 7 and Figure 8 In some embodiments, the approaching part 323, the first connecting part 3241, and the second connecting part 3242 define a third open groove 3203. That is, the conductive part 32 is arranged to be bent to form a "C" shape.

[0217] In the technical solution, the conductive part 32 is bent to form the above-mentioned shape. On the one hand, the conductive part 32 can play a better buffering role. When the battery monomer 102 is used in a vibration environment, the vibration can be absorbed to protect the electrode part 3 and improve the reliability of the battery monomer 102. On the other hand, the two open grooves are arranged to make the conductive part 32 regularly bent. The bent part is not easy to be inserted into the inside of the active material coating part 31 due to redundancy, thereby reducing the risk of short circuit of the battery monomer 102 and improving the mutual interference and rubbing between the tabs 321 of the conductive part 32, reducing the lithium precipitation phenomenon, and further improving the reliability of the battery monomer 102.

[0218] In some embodiments, the conductive part 32 includes a tab 321, the tab 321 includes a plurality of tab 321 pieces stacked and arranged, and the approaching part 323 and the connecting part 324 are formed by different parts of the tab 321.

[0219] That is, the tab 321 is directly connected with the pole part 2, so that the following conductive part 322 can be omitted, and the connection step of the conductive part 322 and the tab 321 is omitted, which is beneficial to improve the production efficiency of the battery monomer 102.

[0220] In addition, by pre-contracting the plurality of tab 321 pieces of the tab 321, the connecting part 324 of the conductive part 32 can present a plate shape in which a plurality of tab 321 pieces are connected together and have a certain rigidity, instead of a fluffy and loose multi-layer foil shape, thereby facilitating the cooperation and connection of the tab 321 and the pole part 2, making the welding of the tab 321 and the pole part 2 more reliable, and the welding seam is not easy to form a gap, which can improve the connection reliability and conductivity of the welding part, and make the conductivity of the electrode part 3 and the pole part 2 more stable and reliable.

[0221] In some embodiments, the plurality of tab pieces 321 are brought together and connected to form a second connecting portion 3242 at a position of the brought-together portion 323 away from the active material coated portion 31. The connecting structure of the plurality of tab pieces 321 at the second connecting portion 3242 is in a long strip shape extending along the length direction of the tab member 2.

[0222] In some embodiments, the plurality of tab pieces 321 at the second connecting portion 3242 can be connected by ultrasonic welding. The ultrasonic welding can make the surfaces of any two adjacent tab pieces 321 closely contact and connect, and has high welding strength and stability, which is conducive to improving the structural integrity and reliability of the conductive portion 32. Moreover, the ultrasonic welding has fast welding speed, which is conducive to improving the welding efficiency. Of course, the plurality of tab pieces 321 at the second connecting portion 3242 can also be connected by laser welding. The second connecting portion 3242 and the tab member 2 can also be connected by laser welding.

[0223] Therefore, by setting the connecting structure of the plurality of tab pieces 321 at the second connecting portion in a long strip shape, the connection reliability of the conductive portion 32 and the tab member 2 can be improved.

[0224] Please refer to Figure 26 , Figure 26 for the structure sectional view of the battery cell 102 of some embodiments of the present application. In some embodiments, the conductive portion 32 comprises a tab 321 connected to one end of the active material coated portion 31 close to the first shell wall 13, and the tab 321 comprises a plurality of tab pieces 321 arranged in layers.

[0225] The conductive portion 32 further comprises a conductive piece 322 connected between the tab 321 and the tab body 21, and the conductive piece 322 forms at least part of the connecting portion 324, and at least part of the tab 321 forms the brought-together portion 323.

[0226] Specifically, the tab 321 can be connected with the conductive piece 322 first, and then the conductive piece 322 and the tab member 2 can be welded together; or the conductive portion 32 and the tab member 2 can be welded together first, and then the tab 321 and the conductive portion 32 can be connected together.

[0227] Therefore, by indirectly connecting the tab 321 and the tab member 2 through the conductive piece 322, the length of the tab 321 can be shortened, and the problems such as wrinkling, bending and breaking of the tab pieces 321 can be improved. Moreover, by flexibly designing the shape and material of the conductive piece 322, the connection difficulty with the tab member 2 can be reduced, and the connection convenience of the conductive piece 322 and the tab member 2 can be improved.

[0228] Please refer to Figure 26 again. In some embodiments, the conductive piece 322 has a slot 3220, and the tab 321 is at least partially inserted into the slot 3220.

[0229] Specifically, the conductive member 322 can include two clamping segments 3221, and a slot 3220 is defined between the two clamping segments 3221, and the tab 321 is clamped between the two clamping segments 3221 and connected with the clamping segments 3221 at one end away from the active material coated part 31. Thus, the slot 3220 can be used to limit the end of the tab 321 away from the active material coated part 31 (denoted as the tab end 3212), and the connection reliability of the tab 321 and the conductive member 322 can be improved.

[0230] The end of the tab 321 away from the active material coated part 31 can be a structure in which the ends of the plurality of stacked tab pieces are connected together in advance, so that the processing procedure can be simplified and the processing efficiency can be improved. Of course, the end of the tab 321 away from the active material coated part 31 can also be a structure in which the ends of the plurality of stacked tab pieces are not connected together in advance by welding or other means before the tab 321 is connected with the conductive member 322.

[0231] In some embodiments, the conductive member 322 includes a transition piece, and the transition piece includes a plurality of transition foils, and the plurality of transition foils are stacked and connected to make the transition piece deformable. The material of the plurality of transition foils can be the same as the material of the tab 321, and the plurality of transition foils can be welded at several key positions by ultrasonic welding or the like to make the plurality of transition foils connected together.

[0232] Since the plurality of transition foils have a small thickness, the plurality of transition foils are equivalent to a plurality of thin plates, and the transition piece formed by the plurality of transition foils is more easily bent than an integrally formed transition piece, so that the transition piece and the tab 321 can be bent as needed, so that the conductive part 32 forms a preset "S", "C" or the like, thereby meeting the design needs.

[0233] Please refer to Figure 23 , Figure 23 The structure of the battery cell of some embodiments of the present application is shown in the cross-sectional view. In this embodiment, the first part 211 and the second part 212 are connected by the transition part 213, and the conductive part 32 is bent to present a "C" shape. The transition structure 22 is provided with a positioning protrusion, and the sealing member 232 has a positioning groove matched with the positioning protrusion; or the inner extension part 2142 is provided with a positioning protrusion, and the sealing member 232 has a positioning groove matched with the positioning protrusion.

[0234] Please refer to Figure 24 , Figure 24For the structural cross-sectional view of the battery cell of another embodiment of the present application, in the embodiment, the first portion 211 and the second portion 212 are arranged adjacently and at an angle, and the conductive portion 32 is arranged in a bent manner to present a "C" shape. The adapter structure 22 is provided with a positioning protrusion, and the sealing member 232 is provided with a positioning groove matched with the positioning protrusion; or, the inner extension portion 2142 is provided with a positioning protrusion, and the sealing member 232 is provided with a positioning groove matched with the positioning protrusion.

[0235] Please refer to Figure 25 , Figure 25 For the structural cross-sectional view of the battery cell of another embodiment of the present application, in the embodiment, the pole column end surface 210 includes an inclined surface gradually away from the active material coating portion 31 along the width direction of the pole column component 2, and the first portion 211 and the second portion 212 are both located on the inclined surface, and the conductive portion 32 is arranged in a bent manner to present a "C" shape. The adapter structure 22 is provided with a positioning protrusion, and the sealing member 232 is provided with a positioning groove matched with the positioning protrusion; or, the inner extension portion 2142 is provided with a positioning protrusion, and the sealing member 232 is provided with a positioning groove matched with the positioning protrusion.

[0236] In some embodiments, the shell component 1 includes a shell body 11 and a shell cover 12, the shell body 11 is provided with an opening 110, and the shell cover 12 covers the opening 110. The first shell wall 13 includes the wall body of the shell body 11 arranged opposite to the opening 110. That is, the pole column component 2 is installed on the wall body of the shell body 11 opposite to the opening 110.

[0237] In the embodiment, the pole column component 2 is located on the same side of the electrode component 3 as the first shell wall 13, that is, the pole column component 2 is arranged on the side where the first shell wall 13 is located, so that the pole column component 2 can be installed at the mounting hole 131 of the first shell wall 13. For example, when the first shell wall 13 is located above the electrode component 3, the pole column component 2 is also located above the electrode component 3; when the first shell wall 13 is located below the electrode component 3, the pole column component 2 is also located below the electrode component 3; when the first shell wall 13 is located on the side of the electrode component 3, the pole column component 2 is also located on the same side of the electrode component 3.

[0238] For example, the shell component 1 can be surrounded by different wall surfaces, one of which is the first shell wall 13. Taking a plane perpendicular to the penetrating direction of the mounting hole 131 as the projection plane, the orthographic projection of the mounting hole 131 on the projection plane completely falls within the orthographic projection of the first shell wall 13 on the projection plane, and the orthographic projection area of the mounting hole 131 is smaller than the orthographic projection area of the first shell wall 13. One or more mounting holes 131 can be arranged on the first shell wall 13 to meet the installation requirements of one or more pole column components 2.

[0239] Please refer to Figure 5In some embodiments, the shell component 1 comprises a shell body 11 and a shell cover 12, the shell body 11 has an opening 110, and the shell cover 12 covers the opening 110. The first shell wall 13 comprises the shell cover 12. That is, the pole component 2 is installed on the shell cover 12.

[0240] In the above technical solution, the shell body 11 further comprises a supporting plate located between the wall opposite to the opening 110 of the shell body 11 and the electrode component 3, so as to support and protect the electrode component 3.

[0241] In the above technical solution, the pole component 2 can be arranged on the wall of the shell body 11 opposite to the opening 110, or the pole component 2 can be arranged on the shell cover 12, so as to realize flexible arrangement of the pole component 2.

[0242] Please refer again to Figure 5 In some embodiments, the battery monomer 102 further comprises an insulating film 7, which can wrap the active material coating part 31, so as to improve the insulation reliability between the active material coating part 31 and the shell component 1, reduce or prevent the contact between the active material coating part 31 and the shell component 1 from causing corrosion of the shell component 1, reduce the leakage problem of the electrolyte caused by corrosion of the shell component 1, and improve the reliability of the battery monomer 102.

[0243] Please refer again to Figure 5 In some embodiments, the battery monomer 102 further comprises an insulating support 9 arranged between the active material coating part 31 and the first shell wall 13, and the end of the pole component 2 close to the electrode component 3 is located in the inner ring area of the insulating support 9. In the above technical solution, by arranging the insulating support 9, the insulation between the active material coating part 31 of the electrode component 3 and the clamping structure can be realized, and the insulation between the active material coating part 31 of the electrode component 3 and the first shell wall 13 can also be realized, which is beneficial to improve the reliability of the battery monomer 102.

[0244] Please refer again to Figure 3 In some embodiments, the first shell wall 13 is provided with a pressure relief device 6, which can realize pressure relief and exhaust when opened.

[0245] In the above technical solution, one pole component 2 can be arranged on the first shell wall 13, and the pressure relief device 6 and the pole component 2 can be arranged at intervals in the length direction of the first shell wall 13. Two pole components 2 can also be arranged on the first shell wall 13, and the two pole components 2 and the pressure relief device 6 can be arranged at intervals in the length direction of the first shell wall 13, and the pressure relief device 6 can be located between the two pole components 2.

[0246] Please refer again to Figure 2According to some embodiments of the present application, the present application further provides a battery device 100 comprising the battery cell 102 according to any of the above embodiments.

[0247] In the technical solutions of the embodiments of the present application, the battery cell 102 can reduce the production difficulty, improve the production efficiency, and further improve the energy density of the battery device 100.

[0248] For example, the battery device 100 can further comprise a busbar component, and the plurality of battery cells 102 are electrically connected by the busbar component. In this way, the series and / or parallel connection of the plurality of battery cells 102 can be achieved. For example, when the plurality of battery cells 102 are connected in series, the pole component 2 of the anode of one battery cell 102 is connected to the pole component 2 of the cathode of the next battery cell 102 by a busbar component, and the pole component 2 of the cathode of the battery cell 102 is connected to the pole component 2 of the anode of the previous battery cell 102 by another busbar component.

[0249] For example, in combination with the drawings, the battery device 100 comprises a box 101, and the plurality of battery cells 102 are accommodated in the box 101. The bottom of the box 101 is a box bottom plate. The pole component 2 is arranged on the side of the housing component 1 facing the box bottom plate, or on the side of the housing component 1 away from the box bottom plate.

[0250] During use of the battery device 100, for example, during vehicle use, the box bottom plate is located at the bottom of the box 101 in the direction of gravity. Therefore, when the pole component 2 is arranged on the side of the housing component 1 facing the box bottom plate, it means that the pole component 2 is located at the bottom of the housing component 1 in the direction of gravity. At this time, the battery cell 102 is in an inverted state, and the product of pressure relief is sprayed in a direction away from the passenger compartment, which is safer. When the pole component 2 is arranged on the side of the housing component 1 away from the box bottom plate, it means that the pole component 2 is located at the top of the housing component 1 in the direction of gravity. At this time, the battery cell 102 is in a normal state, and the electrolyte is not easy to leak. Therefore, the orientation of the battery cell 102 and the box 101 can be flexibly arranged.

[0251] According to some embodiments of the present application, the present application further provides a power consuming device, which comprises the battery cell 102 according to the above embodiments, or comprises the battery device 100 according to the above embodiments, and the battery device 100 is used to provide electric energy for the power consuming device.

[0252] The power consuming device can be any of the devices or systems using the battery device 100.

[0253] By adopting the battery device 100, the performance of the electric device can be improved, and the electric device has a compact structure, which is beneficial to the structural design of the electric device.

[0254] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery, which comprises: a housing component comprising a first housing wall; a pole component connected to the first housing wall; an electrode component accommodated in the housing component and comprising an active material coating part and a conductive part connected to the active material coating part; wherein one end of the pole component towards the active material coating part has a first part and a second part, the distance between the first part and the active material coating part is greater than the distance between the second part and the active material coating part in the height direction of the active material coating part, the conductive part is at least partially located between the first part and the active material coating part, and the conductive part is connected to the second part or a position of the first part close to the second part.

2. The battery cell of claim 1, wherein, The first part and the second part are connected through a transition part.

3. The battery cell of claim 2, wherein, One end of the pole component towards the active material coating part has a first accommodating groove, and the groove opening of the first accommodating groove is arranged towards the active material coating part; The first accommodating groove comprises a first groove bottom wall and a first groove peripheral wall, the first groove bottom wall is arranged opposite to the groove opening of the first accommodating groove, the first groove peripheral wall surrounds the first groove bottom wall, the first part is located on the first groove bottom wall, the transition part is located on the first groove peripheral wall, the second part is located outside the groove opening of the first accommodating groove, and a part of the conductive part is located in the first accommodating groove and another part is located outside the groove opening of the first accommodating groove to be connected to the second part.

4. The battery cell of claim 3, wherein, The second part and the first accommodating groove are arranged in the width direction of the pole component, and in the width direction of the pole component, the transition part gradually approaches the active material coating part from the groove bottom wall to the second part.

5. The battery cell of claim 1, wherein, The first part and the second part are adjacent and arranged at an angle.

6. The battery cell of claim 5, wherein, One end of the pole component towards the active material coating part has a second accommodating groove, and the groove opening of the second accommodating groove is arranged towards the active material coating part; The second accommodating groove comprises a second groove bottom wall and a second groove peripheral wall, the second groove bottom wall is arranged opposite to the groove opening of the second accommodating groove, the second groove peripheral wall surrounds the second groove bottom wall, the first part is located on the second groove bottom wall, the second part is located on the second groove peripheral wall, and the conductive part is at least partially located in the second accommodating groove to be connected to the second part.

7. The battery cell of claim 1, wherein, One end of the pole component towards the active material coating part has a pole end face, the pole end face comprises an inclined surface gradually away from the active material coating part in the width direction of the pole component, and the first part and the second part are both located on the inclined surface.

8. The battery cell of claim 7, wherein, One end of the pole component towards the active material coating part has a third accommodating groove, and the groove opening of the third accommodating groove is arranged towards the active material coating part; The third accommodating groove includes a first groove side wall and a second groove side wall oppositely arranged in a width direction of the pole piece component, the first groove side wall gradually moves away from the second groove side wall in a direction close to the active material coating part, the first part and the second part are both located at the first groove side wall, and the conductive part is at least partially located in the third accommodating groove to be connected with the second part.

9. The battery cell of claim 1, wherein, The pole piece component has an accommodating groove at one end thereof facing the active material coating part, and an opening of the accommodating groove is arranged to face the active material coating part; The conductive part is at least partially located in the accommodating groove, the first part is located at a groove wall of the accommodating groove, and the second part is located at the groove wall of the accommodating groove or outside the opening of the accommodating groove.

10. The battery cell of claim 9, wherein, The accommodating groove has a depth of H, the conductive part includes a close-together part and a connecting part arranged in an extension direction thereof, the close-together part is connected between the active material coating part and the connecting part, the connecting part is at least partially located in the accommodating groove, and the connecting part has a thickness of h, H is greater than or equal to twice h.

11. The battery cell of claim 9, wherein, The second part is located outside the opening of the accommodating groove, and a width difference between the second part and a width of a connecting position of the connecting part and the second part is greater than or equal to 5 mm.

12. The battery cell of claim 9, wherein, The pole piece component includes: A pole body, the first part and the second part are arranged at the pole body; An adapter structure, the adapter structure surrounds the pole body and is connected with the first shell wall; An insulating sealing structure, the insulating sealing structure is insulating and sealingly fitted between the adapter structure and the pole body; The accommodating groove is defined by the pole body, or the accommodating groove is formed by the pole body and the insulating sealing structure.

13. The battery cell of claim 12, wherein, The second portion is located outside the notch of the accommodating groove, the width of the second portion is L1, the width of the one end of the pole body near the active material coating portion is L2, the depth of the accommodating groove is H, (L2-L1) 2 greater than or equal to three times H 2 .

14. The battery cell of any one of claims 1-13, wherein, The pole piece component includes: A pole body, the first part and the second part are arranged at the pole body; An adapter structure, the adapter structure surrounds the pole body and is connected with the first shell wall; An insulating sealing structure, the insulating sealing structure is insulating and sealingly fitted between the adapter structure and the pole body.

15. The battery cell of claim 14, wherein, The adapter structure includes an adapter ring and a clamping piece, the adapter ring is arranged outside the clamping piece and is connected with the first shell wall, and the clamping piece includes: A first clamping part; A second clamping part, oppositely arranged with the first clamping part in a thickness direction of the first shell wall, and the first clamping part and the second clamping part jointly define a first clamping groove, an opening of the first clamping groove faces the pole body, so that the first clamping groove clamps the pole body, and the insulating sealing structure is at least partially arranged between the pole body and an inner wall of the first clamping groove.

16. The battery cell of claim 15, wherein, The first clamping part is connected to a side of the second clamping part away from the electrode component, and the pole piece component further includes: An outer insulating piece, at least partially covering a side of the first clamping part away from the first clamping groove.

17. The battery cell of claim 14, wherein, The pole body includes: A main body part; An inner extension part, located at a side of the adapter structure close to the active material coating part and connected with the main body part; An outer extension part, located at a side of the adapter structure away from the active material coating part and connected with the main body part; The main body, the inner extension and the outer extension together define a second clamping groove, an opening of the second clamping groove faces the adapter structure, so that the second clamping groove clamps the adapter structure, and the insulation sealing structure is arranged at least partially between the adapter structure and an inner wall of the second clamping groove.

18. The battery cell of claim 17, wherein, The insulation sealing structure comprises: an inner insulation member arranged at least partially between the outer extension and a side of the adapter structure away from the electrode component; a sealing member arranged at least partially between the inner extension and a side of the adapter structure close to the electrode component, and in contact with the inner insulation member; The adapter structure or the inner extension is provided with a positioning protrusion, and the sealing member has a positioning groove matched with the positioning protrusion.

19. The battery cell of claim 18, wherein, The positioning protrusion is arranged at a side of the adapter structure close to the electrode component, and is located at a radial middle part or a radial inner side of the adapter structure.

20. The battery cell of claim 18, wherein, The positioning protrusion is arranged at a side of the inner extension close to the adapter structure, and is located at a radial outer side of the inner extension.

21. The battery cell of any one of claims 1-20, wherein, The conductive part comprises a converging part and a connecting part arranged in an extending direction of the conductive part, the converging part is connected to an end of the active material coating part facing the first shell wall, and the connecting part is connected to the pole column component; The connecting part comprises a first connecting part and a second connecting part, the first connecting part is connected between the converging part and the second connecting part, the first connecting part is located between the first part and the converging part, and the second connecting part is connected to the second part or a position of the first part close to the second part.

22. The battery cell of claim 21, wherein, The first connecting part comprises a first bending section and a second bending section connected to each other, the first bending section is connected to the converging part and a first opening groove is defined between the first bending section and the converging part, the second bending section is connected to the second connecting part and a second opening groove is defined between the second bending section and the second connecting part, openings of the first opening groove and the second opening groove are arranged at an included angle and are spaced apart in a thickness direction of the first shell wall.

23. The battery cell of claim 21, wherein, The converging part, the first connecting part and the second connecting part define a third opening groove.

24. The battery cell of claim 21, wherein, The conductive part comprises a tab, the tab comprises a plurality of tab pieces stacked and arranged, and the converging part and the connecting part are formed by different parts of the tab.

25. The battery cell of claim 24, wherein, The plurality of tab pieces are converged and connected to form the second connecting part at a position of the converging part away from the active material coating part. A connection structure of the plurality of tab pieces at the second connecting part is a long strip extending along a length direction of the pole column component.

26. The battery cell of claim 21, wherein, The conductive part comprises: a tab connected to an end of the active material coating part close to the first shell wall, and the tab comprises a plurality of tab pieces stacked and arranged; a conductive member connected between the tab and the pole column body, the conductive member forms at least part of the connecting part, and at least part of the tab forms the converging part.

27. The battery cell of claim 26, wherein, The conductive member has a slot, and the tab is at least partially inserted into the slot.

28. The battery cell of claim 26, wherein, The conductive member comprises a transition piece, the transition piece comprises a plurality of transition foil pieces stacked and arranged, so that the transition piece is deformable.

29. The battery cell of any one of claims 1-28, wherein, The shell member comprises a shell body having an opening and a shell cover covering the opening; the first shell wall comprises a wall body arranged opposite to the opening of the shell body, and / or the first shell wall comprises the shell cover.

30. A battery device, characterized by A battery cell according to any one of claims 1-29.

31. An electrical device, comprising: A battery cell according to any one of claims 1-29; or, a battery device according to claim 30.

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