Battery cell, battery, and electric device

Abstract

The embodiment of the present application provides a battery monomer, a battery and an electric equipment. The battery monomer comprises: a shell with a first wall; an electrode assembly arranged in the shell; and an electrode lead-out piece installed on the first wall and used for leading out electric energy of the electrode assembly; wherein the electrode lead-out piece comprises a first surface, a plane where the first surface is located intersects with the first wall, and the first surface is used for being connected with a busbar component. The battery composed of the battery monomer has higher assembly efficiency.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to international patent application PCT / CN2022 / 103107 entitled “Battery Cell, Battery and Electrical Device”, filed on June 30, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0005] In the battery manufacturing process, battery assembly efficiency is a crucial issue. Therefore, improving battery assembly efficiency is a pressing technical problem that needs to be solved in battery technology. Summary of the Invention

[0006] The purpose of this application is to provide a battery cell, a battery, and an electrical device. The battery cell constituted by this application has high assembly efficiency.

[0007] This application is achieved through the following technical solution:

[0008] In a first aspect, this application provides a battery cell, comprising: a housing having a first wall; an electrode assembly disposed within the housing; and an electrode lead-out member mounted on the first wall for drawing out electrical energy from the electrode assembly; wherein the electrode lead-out member includes a first surface, the plane of which intersects with the first wall, and the first surface is used to connect with a busbar component.

[0009] According to the embodiments of this application, the plane containing the first surface of the battery cell intersects with the first wall to facilitate the welding of the busbar component and the electrode lead-out component, thereby improving the assembly efficiency of the battery composed of the battery cell.

[0010] According to some embodiments of this application, the electrode lead-out further includes a second surface, the plane of which the second surface intersects with the first surface, the area of ​​the second surface is D1, the area of ​​the first surface is D2, and the condition 0.1≤D2 / D1≤10 is met.

[0011] In the above scheme, the ratio of the area D2 of the first surface to the area D1 of the second surface satisfies the above relationship, which can balance the energy density and current-carrying area of ​​the battery. When D2 / D1 < 0.1, D2 is too small, the welding area between the busbar and the electrode lead is too small, affecting the current-carrying capacity; or, D1 is too large, the area occupied by the electrode lead in the direction perpendicular to the thickness of the first wall is too large, occupying space of the electrode assembly and affecting the energy density. When 10 < D2 / D1, D2 is too large, the space occupied by the electrode lead in the thickness direction of the first wall is too large, affecting the energy density; or, D1 is too small, the connection area between the electrical connection component (such as the electrode terminal) between the tab and the electrode lead and the electrode lead is too small, affecting the current-carrying capacity.

[0012] According to some embodiments of this application, 0.5 ≤ D2 / D1 ≤ 2.

[0013] In the above scheme, when the ratio of the area D2 of the first surface to the area D1 of the second surface satisfies 0.5≤D2 / D1≤2, compared with 0.1≤D2 / D1<0.5 and 2<D2 / D1≤10, the welding area between the electrode lead and the busbar and the welding area between the electrode lead and the electrode terminal can be further guaranteed, the current carrying capacity is better, and the area occupied by the electrode lead is smaller, resulting in a higher energy density of the battery.

[0014] According to some embodiments of this application, along the thickness direction of the first wall, the size of the first surface is W1, which satisfies 1mm≤W1≤10mm, preferably 2mm≤W1≤5mm.

[0015] In the above scheme, along the thickness direction of the first wall, the size W1 of the first surface satisfies the above relationship, so that the first surface and the busbar component can have a large connection area, so as to facilitate the connection between the first surface and the busbar component.

[0016] According to some embodiments of this application, the electrode lead-out further includes a second surface, the plane of which the second surface intersects with the first surface, the electrode lead-out is disposed on the side of the first wall away from the interior of the battery cell, the electrode lead-out includes a first part and a second part, the first part is electrically connected to the tab of the electrode assembly, the second part is used to connect the busbar component, the second surface is the surface of the first part away from the first wall, and the first surface is the surface of the second part.

[0017] In the above scheme, the electrode lead is disposed on the side of the first wall away from the inside of the battery cell, so as to facilitate the connection between the electrode lead and the busbar component; the first part and the second part are respectively used to realize the connection with the tab and the busbar component, which is beneficial to increase the connection area between the electrode lead and the electrode terminal and the connection area between the electrode lead and the busbar component.

[0018] According to some embodiments of this application, the battery cell further includes: an electrode terminal, wherein the first wall is provided with an electrode lead-out hole, one end of the electrode terminal is connected to the first part, and the other end is electrically connected to the tab of the electrode assembly through the electrode lead-out hole.

[0019] In the above scheme, the first part and the electrode assembly's tabs are electrically connected through electrode terminals to guide the electrical energy of the electrode assembly to the electrode lead-out member, so that the electrode lead-out member can extract the electrical energy of the electrode assembly.

[0020] According to some embodiments of this application, at least a portion of the second portion extends beyond the first portion along the thickness direction of the first wall.

[0021] In the above scheme, at least part of the second part extends beyond the first part to increase the area of ​​the first surface, which facilitates the connection between the second part and the busbar component and increases the connection area.

[0022] According to some embodiments of this application, the first portion and the second portion are arranged along a first direction, the first surface is the surface of the second portion that is opposite to the first portion along the first direction, and the first direction is perpendicular to the thickness direction of the first wall.

[0023] In the above scheme, the first part and the second part are arranged along the first direction, and the first surface is the surface of the second part that is opposite to the first part along the first direction, which facilitates the assembly of the electrode lead-out and the busbar component.

[0024] According to some embodiments of this application, the first portion is parallel to the first wall.

[0025] In the above scheme, the first part is parallel to the first wall, which facilitates the assembly of the first part.

[0026] According to some embodiments of this application, at least a portion of the second portion extends in a direction away from the first wall and beyond the second surface.

[0027] In the above scheme, at least a portion of the second part extends beyond the second surface, such that at least a portion of the second part is located on the side of the second surface away from the first wall, so as to reduce interference between the second part and the first wall when the second part is connected to the busbar component.

[0028] According to some embodiments of this application, the electrode lead-out further includes a third portion, which connects the first portion and the second portion.

[0029] In the above scheme, the third part connects the first part and the second part, so that there can be a certain distance between the first part and the second part, so as to facilitate the connection of the electrode lead-out and the busbar component.

[0030] According to some embodiments of this application, the third part includes a first segment and a second segment, the first segment extending from the first part in a direction away from the first wall, the second segment connecting the first segment and the second part, and a gap forming between the first segment and the second part.

[0031] In the above scheme, a gap is formed between the first section and the second part so that the electrode lead can deform to absorb the expansion stress generated when the battery cell expands.

[0032] According to some embodiments of this application, the second portion extends from the second segment toward the direction close to the first wall, and the first segment, the second segment, and the second portion form a U-shaped structure.

[0033] In the above scheme, the first segment, the second segment, and the second part form a U-shaped structure, which is simple and easy to form.

[0034] According to some embodiments of this application, the battery cell further includes a support member inserted into the gap.

[0035] In the above scheme, the support member is inserted into the gap, and the support member can support the second part when the busbar is connected to the second part, which facilitates the connection between the third part and the busbar.

[0036] According to some embodiments of this application, the opposite sides of the support member are in contact with the first segment and the second portion, respectively.

[0037] In the above scheme, the support member is in contact with the first segment and the second part. The support member can play a limiting role, restricting the positional movement of the second part, so as to facilitate the stable connection between the second part and the busbar component.

[0038] According to some embodiments of this application, the support member is made of insulating material, and extends beyond both ends of the third portion along a second direction, the second direction being perpendicular to the thickness direction of the first wall and parallel to the first surface.

[0039] In the above scheme, the support is made of insulating material, and the support extends beyond both ends of the third part, thus having a good insulation effect.

[0040] According to some embodiments of this application, the battery cell further includes: a first insulating member, at least partially disposed between the first wall and the first portion, to insulate and isolate the first wall and the first portion.

[0041] In the above solution, by disposing at least part of the first insulating element between the first wall and the first part, the first wall and the first part are separated, thereby improving the safety of the battery cell.

[0042] According to some embodiments of this application, the support member is connected to the first insulating member.

[0043] In the above scheme, the support member is connected to the first insulating member, so that the connection between the support member and the first insulating member is stable, so that the support member can support the second part.

[0044] According to some embodiments of this application, along a second direction, the first insulating member extends beyond both ends of the first portion, and the second direction is perpendicular to the thickness direction of the first wall and parallel to the first surface.

[0045] In the above scheme, the first insulating element extends beyond both ends of the first part to provide better insulation between the first part and the first wall.

[0046] According to some embodiments of this application, the battery cell further includes: a second insulating member, at least partially disposed between the second portion and the first wall, to insulate the second portion from the first wall.

[0047] In the above solution, by setting a second insulating element between the second part and the first wall, the second part is insulated and separated from the first wall, thereby improving the safety of the battery cell.

[0048] According to some embodiments of this application, the second insulating member is connected to the first insulating member.

[0049] In the above scheme, the second insulating component is connected to the first insulating component, and the connection between the second insulating component and the first insulating component is stable. The two can be integrally formed to facilitate assembly and positioning.

[0050] According to some embodiments of this application, the end of the second portion away from the second segment abuts against the second insulating member.

[0051] In the above scheme, the end of the second part away from the second segment abuts against the second insulating member, which can restrict the movement of the second insulating member along the thickness direction of the first wall.

[0052] According to some embodiments of this application, along a second direction, the second insulating member extends beyond both ends of the second portion, the second direction being perpendicular to the thickness direction of the first wall and parallel to the first surface.

[0053] In the above scheme, the second insulating element extends beyond both ends of the second part along the second direction, so that the second part has a better insulation effect with the first wall.

[0054] According to some embodiments of this application, the thickness of the first portion is greater than the thickness of the third portion, and / or the thickness of the second portion is greater than the thickness of the third portion.

[0055] In the above embodiments, where the thickness of the first part is greater than the thickness of the third part, the strength of the first part can be enhanced, reducing the risk of the first part being welded through during welding to the electrical connection components (such as electrode terminals) between the first part and the tab and the electrode lead-out, thus meeting welding requirements. Similarly, in embodiments where the thickness of the second part is greater than the thickness of the third part, the risk of the second part being welded through during welding to the busbar component can be reduced, also meeting welding requirements. In embodiments where the thickness of the first part is greater than the thickness of the third part, and the thickness of the second part is greater than the thickness of the third part, both the first and second parts have a relatively large thickness, which can meet welding requirements and reduce the risk of both the first and second parts being welded through.

[0056] According to some embodiments of this application, the first part, the third part, and the second part are arranged sequentially along a first direction, the dimension of the third part along the second direction is greater than the dimension of the first part along the second direction, the dimension of the third part along the second direction is greater than the dimension of the second part along the second direction, and the first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other.

[0057] In the above scheme, since the thickness of the third part is smaller, the size of the third part is the largest compared to the first and second parts along the second direction, which enables the third part to have a larger flow area to meet the flow requirements.

[0058] According to some embodiments of this application, the cross-sectional area of ​​the first part is S1, the cross-sectional area of ​​the third part is S2, and the cross-sectional area of ​​the first part is S3; wherein, 0.2≤S1 / S2≤5, 0.2≤S2 / S3≤5, 0.2≤S1 / S3≤5; preferably, 0.5≤S1 / S2≤2, 0.5≤S2 / S3≤2, 0.5≤S1 / S3≤2.

[0059] In the above scheme, the flow area S1 of the first part, the flow area S2 of the second part, and the flow area S3 of the third part satisfy the above relationship, so that the electrode lead-out component as a whole has better flow capacity. When 0.5≤S1 / S2≤2, 0.5≤S2 / S3≤2, and 0.5≤S1 / S3≤2, the overall flow capacity of the electrode lead-out component is better than that when 0.2≤S1 / S2≤5, 0.2≤S2 / S3≤5, and 0.2≤S1 / S3≤5.

[0060] According to some embodiments of this application, the thickness of the first part is H1, satisfying 0.2mm≤H1≤5mm, preferably 0.5mm≤H1≤4mm; or the thickness of the third part is H2, satisfying 0.2mm≤H2≤2mm, preferably 0.3mm≤H2≤1.2mm; or the thickness of the second part is H3, satisfying 0.2mm≤H3≤5mm, preferably 0.5mm≤H3≤4mm.

[0061] In the above scheme, the thickness H1 of the first part satisfies the above relationship, and the first part is not easy to be soldered through when it has a better flow capacity; the thickness H2 of the third part satisfies the above relationship, and the third part is easy to bend when it has a larger flow area; the thickness H3 of the second part satisfies the above relationship, and the second part is not easy to be soldered through when it has a better flow capacity.

[0062] According to some embodiments of this application, the battery cell further includes: an electrode terminal, wherein the first wall is provided with an electrode lead-out hole, the electrode terminal passes through the electrode lead-out hole, one end of the electrode terminal is connected to the electrode lead-out member, and the other end is electrically connected to the tab of the electrode assembly.

[0063] In the above scheme, the electrode terminals are positioned by passing through the electrode lead-out holes, which facilitates the connection between the electrode terminals and the electrode lead-out parts and the electrode tabs.

[0064] According to some embodiments of this application, the number of electrode terminals and the number of electrode lead-out holes are both multiple, the electrode terminals and the electrode lead-out holes correspond one-to-one, and the electrode lead-out member is provided with a first groove, the first groove being located between two adjacent electrode terminals.

[0065] In the above scheme, both the number of electrode terminals and the number of electrode lead-out holes are multiple, resulting in better current-carrying capacity. The first groove can reduce the weight of the electrode lead-out components without affecting current carrying capacity.

[0066] According to some embodiments of this application, the first groove extends to the edge of the electrode lead-out.

[0067] In the above scheme, the first groove extends to the edge of the electrode lead-out to facilitate the processing of the first groove on the edge of the electrode lead-out, thereby reducing the processing difficulty.

[0068] According to some embodiments of this application, the battery cell further includes: a first insulating member, at least partially disposed between the first wall and the electrode lead, to insulate and isolate the first wall and the electrode lead, the first insulating member including a first protrusion inserted into the first groove.

[0069] In the above scheme, the first insulating element isolates the first wall from the electrode lead-out, thus separating the first wall from the electrode lead-out; the first protrusion is inserted into the first groove to facilitate the positioning of the electrode lead-out.

[0070] According to some embodiments of this application, the first wall includes a third surface facing away from the interior of the battery cell, the third surface having a second protrusion, and the first insulating member including a second groove, the second protrusion being inserted into the second groove.

[0071] In the above scheme, the positioning of the first insulating component is achieved by the cooperation of the second protrusion and the second groove, which facilitates the assembly of the first insulating component with the first wall.

[0072] According to some embodiments of this application, the electrode lead extends beyond the edge of the first wall, and the first surface is located in the portion of the electrode lead that extends beyond the first wall.

[0073] In the above scheme, the electrode lead extends beyond the edge of the first wall. When viewed in a direction perpendicular to the bottom wall, the projection of the first surface does not overlap with the first wall, so as to facilitate the electrical connection between the electrode lead and the bus component.

[0074] According to some embodiments of this application, the electrode lead-out includes a first part and a second part. The first part is electrically connected to the tab of the electrode assembly, and the second part is used to connect the busbar component. The second part extends beyond the edge of the first wall, extends along the thickness direction of the first wall and protrudes from the first part, and the first surface is the surface of the second part facing away from the first part.

[0075] In the above scheme, since the second part is used to connect the busbar component, the second part extends beyond the edge of the first wall, and the first surface is the surface of the second part away from the first part, when the busbar component is connected to the first surface, the busbar component can have a certain distance from the first wall, reducing the risk of interference between the busbar component and the first wall, and reducing the risk of short circuit between the busbar component and the housing, so as to facilitate the assembly of the busbar component and the electrode lead-out component.

[0076] According to some embodiments of this application, the plane containing the first surface is perpendicular to the first wall.

[0077] In the above scheme, the plane where the first surface is located is perpendicular to the first wall, which facilitates the electrical connection between the electrode lead-out and the busbar component.

[0078] According to some embodiments of this application, the outer shell includes a first wall and a second wall disposed opposite to each other along the thickness direction of the first wall, a third wall and a fourth wall disposed opposite to each other along a first direction, and a fifth wall and a sixth wall disposed opposite to each other along a second direction. The areas of the third wall and the fourth wall are both smaller than the area of ​​the first wall, the areas of the third wall and the fourth wall are both smaller than the area of ​​the second wall, the areas of the fifth wall and the sixth wall are both smaller than the area of ​​the first wall, and the thickness direction of the first wall, the first direction, and the second direction are perpendicular to each other.

[0079] According to some embodiments of this application, the housing includes a shell and an end cap, the shell having an opening, the end cap closing the opening, and the first wall being the end cap.

[0080] In the above scheme, the first wall is an end cap, which facilitates the assembly of the electrode lead-out parts.

[0081] Secondly, this application provides a battery, comprising: a housing; a busbar assembly housed within the housing; and a plurality of battery cells as provided in the above embodiments housed within the housing, wherein the plurality of battery cells are stacked along the thickness direction of the first wall, and the electrode leads of the plurality of battery cells are electrically connected through the busbar assembly.

[0082] According to the battery embodiments of this application, the use of the above-described battery cell can improve the assembly efficiency of the electrode leads and the busbar of the battery cell, thereby improving the assembly efficiency of the battery.

[0083] According to some embodiments of this application, in the thickness direction of the first wall, the projection of the end of the confluence component at least partially overlaps with the first wall.

[0084] In the above scheme, the projection of the end of the busbar component at least partially overlaps with the first wall, so as to save assembly space, make the internal components of the battery compact, and improve the energy density of the battery.

[0085] According to some embodiments of this application, the electrode lead-out is welded to the busbar component to form a solder area. Along the thickness direction of the first wall, the size of the first surface is W1, and the size of the solder area is W2, satisfying 0.01≤W2 / W1≤0.5, preferably 0.1≤W2 / W1≤0.3.

[0086] In the above scheme, the ratio of the solder area size W2 to the first surface size W1 satisfies the aforementioned relationship, resulting in better current carrying capacity, higher connection strength, and better safety of the battery cell at the welded joint. If the ratio of the solder area size W2 to the first surface size W1 is too small, it will lead to poor current carrying capacity and insufficient connection strength at the welded joint. When the busbar component and the electrode lead are laser welded, if the ratio of the solder area size W2 to the first surface size W1 is too large, it may cause the local welded position to extend beyond the second part, resulting in the local insulation structure being melted and reducing the safety of the battery cell.

[0087] According to some embodiments of this application, along the second direction, the size of the first surface is F1, and the size of the solder area is F2, satisfying 0.01≤F2 / F1≤0.5, preferably 0.1≤F2 / F1≤0.3, and the second direction is perpendicular to the thickness direction of the first wall and parallel to the first surface.

[0088] In the above scheme, the ratio of the dimension F2 of the solder area in the second direction to the dimension F1 of the first surface in the second direction satisfies the above relationship, which makes the welding part have better current carrying capacity, higher connection strength, and better safety of the battery cell.

[0089] According to some embodiments of this application, the area of ​​the first surface is M1, and the area of ​​the solder area is M2, satisfying 0.01≤M1 / M2≤0.5, preferably 0.1≤M1 / M2≤0.3.

[0090] In the above scheme, the ratio of the area M1 of the first surface to the area M2 of the solder area satisfies the above relationship, and the solder area has better current carrying capacity, higher connection strength, and better safety of the battery cell.

[0091] According to some embodiments of this application, the busbar component includes a bottom wall, two side walls, and two flanges. The two side walls are arranged opposite to each other along the thickness direction of the first wall. The bottom wall connects the two side walls. Each flange extends from the end of the corresponding side wall away from the bottom wall in a direction away from the other side wall. The two flanges are respectively connected to the electrode leads of the two battery cells.

[0092] In the above scheme, the structure of the busbar component facilitates the connection of the busbar component with the first surface of the electrode leads of the two battery cells.

[0093] According to some embodiments of this application, the housing further has a second wall disposed opposite to the first wall, and a first region of the edge of the second wall is recessed to form a recess for accommodating at least a portion of the electrode leads of the battery cell adjacent to the second wall.

[0094] In the above scheme, when multiple battery cells are stacked, the recess can accommodate at least the electrode leads of the battery cell adjacent to the second wall, making reasonable use of the assembly space and enabling the battery to have a high energy density.

[0095] According to some embodiments of this application, the electrode lead extends beyond the edge of the first wall, the first surface is located in the portion of the electrode lead extending beyond the first wall, and the busbar is a flat plate structure.

[0096] In the above scheme, the electrode lead extends beyond the edge of the first wall. When viewed in a direction perpendicular to the bottom wall, the projection of the first surface does not overlap with the first wall, so as to facilitate the electrical connection between the electrode lead and the busbar component. The busbar component has a simple structure, is easy to process and manufacture, and has low manufacturing cost.

[0097] According to some embodiments of this application, the electrode lead is at least partially accommodated in the recess of the battery cell adjacent to the first wall. The electrode lead includes a first portion and a second portion. The first portion is electrically connected to the tab of the electrode assembly. The second portion is used to connect the busbar component. The second portion extends beyond the edge of the first wall and protrudes from the first portion along the thickness direction of the first wall. The first surface is the surface of the second portion facing away from the first portion. The second portion extends beyond the recess of the battery cell adjacent to the first wall in a direction pointing towards the electrode lead along the first wall. The second portion extends beyond the recess of the battery cell adjacent to the first wall. And / or, the housing includes a shell and an end cap. The shell has an opening, and the end cap closes the opening. The first wall is the end cap. In a direction perpendicular to the first surface, the projection of the second portion overlaps with the projection of the shell.

[0098] In the above scheme, the electrode lead is at least partially accommodated in the recess of the battery cell adjacent to the first wall, and the second portion extends beyond the recess of the adjacent battery cell. Therefore, the first surface can have a larger dimension in the thickness direction of the first wall, so that the electrode lead and the first surface have a larger connection area, thereby making the electrode lead and the busbar firmly connected. In the direction perpendicular to the first surface, the projection of the second portion overlaps with the projection of the housing, so that the second portion has a larger dimension in the arrangement direction of the end cap and the housing, thereby making the first surface have a larger area in the arrangement direction of the end cap and the housing, so that the busbar and the electrode lead have a larger connection area, thereby making the busbar and the electrode lead firmly connected.

[0099] According to some embodiments of this application, the battery further includes an insulating layer disposed on the surface of the electrode lead facing the housing, the insulating layer being used to insulate and isolate the electrode lead from the housing.

[0100] In the above scheme, the isolation layer is used to insulate the electrode lead-out component from the outer casing of the adjacent battery cell or the outer casing of the battery cell with the electrode lead-out component, thereby improving the safety of the battery.

[0101] According to some embodiments of this application, along the thickness direction of the first wall, two adjacent electrode leads of two adjacent battery cells have two opposite ends, and the two ends of the busbar are respectively flush with the two ends; and / or, along the second direction, the opposite ends of the busbar are respectively flush with the opposite ends of the electrode leads, and the second direction, the thickness direction of the first wall, and the thickness direction of the busbar are perpendicular to each other.

[0102] In the above scheme, the two ends of the busbar component in the thickness direction of the first wall are respectively flush with the two opposite ends of the two adjacent electrode leads of the two adjacent battery cells, so as to facilitate the positioning of the busbar component and the corresponding electrode leads in the thickness direction of the first wall, and facilitate the connection between the busbar component and the electrode leads; the two opposite ends of the busbar component along the second direction are respectively flush with the two opposite ends of the electrode leads along the second direction, so as to facilitate the positioning of the busbar component and the corresponding electrode leads in the second direction, and facilitate the connection between the busbar component and the electrode leads.

[0103] Thirdly, this application provides an electrical device including a battery cell provided in any of the above embodiments, wherein the battery cell is used to provide electrical energy.

[0104] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0105] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0106] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0107] Figure 2 Exploded views of batteries provided for some embodiments of this application;

[0108] Figure 3 Exploded views of a single battery cell provided in some embodiments of this application;

[0109] Figure 4 A perspective view of an electrode lead-out element provided in some embodiments of this application;

[0110] Figure 5 This is a schematic diagram of the assembly of the electrode lead-out member with the first wall provided in some embodiments of this application;

[0111] Figure 6 This is a schematic diagram of the structure of the electrode lead-out element provided in some embodiments of this application;

[0112] Figure 7 This is a schematic diagram of the structure of the electrode lead-out element provided in some embodiments of this application;

[0113] Figure 8 Schematic diagrams of the structure of electrode leads provided in other embodiments of this application;

[0114] Figure 9 Schematic diagram of the structure of the electrode lead-out element provided in some embodiments of this application;

[0115] Figure 10 Schematic diagram of the structure of the electrode lead-out element provided in some embodiments of this application;

[0116] Figure 11 Schematic diagrams of the structure of the support member, the first insulating member, and the second insulating member provided in some embodiments of this application;

[0117] Figure 12 Cross-sectional views of a portion of the structure of a battery cell provided in some embodiments of this application;

[0118] Figure 13 A side view of an electrode lead provided for other embodiments of this application;

[0119] Figure 14 for Figure 13 Top view;

[0120] Figure 15 A schematic diagram of the flow cross-section of the first part provided for some embodiments of this application;

[0121] Figure 16 A schematic diagram of the flow cross section of the third part provided for some embodiments of this application;

[0122] Figure 17 A schematic diagram of the flow cross section of the second part provided for some embodiments of this application;

[0123] Figure 18 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0124] Figure 19 for Figure 18 Enlarged view of a portion at point A;

[0125] Figure 20 for Figure 2 A magnified view of section B;

[0126] Figure 21 This is a schematic diagram of the structure of the reflow component provided in some embodiments of this application;

[0127] Figure 22 This is a partial structural schematic diagram of a battery provided in some embodiments of this application;

[0128] The accompanying drawings are not drawn to scale.

[0129] Marking Explanation: 100 - Battery; 10 - Housing; 11 - First Sub-Housing; 12 - Second Sub-Housing; 20 - Battery Cell; 21 - Outer Shell; 211 - Housing; 212 - End Cap; 213 - First Wall; 213a - Third Surface; 2131 - Electrode Lead-out Hole; 2132 - Second Protrusion; 214 - Second Wall; 2141 - Recess; 215 - Third Wall; 22 - Electrode Assembly; 221 - Tab; 23 - Electrode Lead-out Member; 23a - Second Surface; 23b - First Surface; 23c - Fifth Surface; 23d - Side Surface; 231 - First Part; 232 - Second Part; 233 - Part 3; 2331 - First section; 2332 - Second section; 234 - First groove; 235 - First through hole; 241 - Support; 242 - First insulating component; 242a - Sixth surface; 242b - Seventh surface; 2421 - First protrusion; 2422 - Second groove; 2423 - Second through hole; 243 - Second insulating component; 25 - Electrode terminal; 26 - Adapter; 27 - Third insulating component; 30 - Busbar component; 31 - Bottom wall; 32 - Side wall; 33 - Flanged part; 40 - Isolating layer; P - Soldering area; 200 - Controller; 300 - Motor; 1000 - Vehicle. Detailed Implementation

[0130] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0131] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0132] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0133] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0134] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0135] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0136] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0137] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the current collector without the coating serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the current collector without the coating serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, multiple positive electrode tabs and multiple negative electrode tabs are stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0138] The battery cell also includes a casing, electrode terminals, and electrode leads. The casing includes a housing and an end cap. The housing has an opening, and the end cap closes the opening. The electrode assembly is disposed within the housing. The electrode terminals pass through the end cap, and the tabs of the electrode assembly are connected to one end of the electrode terminals. The electrode leads are connected to the other end of the electrode terminals. The electrode leads are used to extract electrical energy from the battery cell. The electrode leads have through holes through which power supply terminals pass, and the electrode terminals pass through these through holes and are riveted to the electrode leads.

[0139] The development of battery technology must take into account multiple design factors, such as energy density, discharge capacity, charge-discharge rate and other performance parameters. In addition, battery assembly efficiency also needs to be considered.

[0140] In the prior art, the assembly efficiency of batteries is low, which affects the mass production of batteries. The inventors have found that in the battery production process, the busbar component is usually welded to the end face of the electrode lead that is away from the end cap (i.e., the second surface mentioned below). Since this end face is not convenient for welding the busbar component to the electrode lead, the assembly process between multiple battery cells is complicated, resulting in low battery assembly efficiency.

[0141] In view of this, in order to solve the problem of low battery assembly efficiency caused by low assembly efficiency of the busbar component and electrode lead-out component, the inventors, after in-depth research, designed a battery cell in which the plane on which the electrode lead-out component and the busbar component are connected intersects with the first wall, so as to facilitate the welding of the busbar component and the electrode lead-out component, thereby improving the assembly efficiency of the battery composed of this battery cell.

[0142] The battery cells disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using battery cells and batteries disclosed in this application.

[0143] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0144] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0145] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0146] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0147] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0148] Please refer to Figure 2 , Figure 2This is an exploded view of a battery provided in some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, collectively defining a space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one open end, while the first sub-housing 11 may be a plate-like structure, covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 together define the space. Alternatively, both the first sub-housing 11 and the second sub-housing 12 may be hollow structures with one open side, with the open side of the first sub-housing 11 overlapping the open side of the second sub-housing 12.

[0149] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component 30 for electrical connection between the multiple battery cells 20.

[0150] Among them, the battery cell 20 can be a secondary battery or a primary battery; the battery cell 20 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0151] Please refer to Figure 3 , Figure 3 Exploded views of individual battery cells provided in some embodiments of this application. For example... Figure 3 As shown, the battery cell 20 includes a housing 21, an electrode assembly 22, an electrode lead-out member 23, and an electrode terminal 25. The housing 21 includes a shell 211 and an end cap 212. The shell 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0152] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. The housing 211 can have various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this. This embodiment uses a rectangular parallelepiped shape for the housing 211 as an example.

[0153] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved safety performance. Functional components such as electrode terminals 25 can be provided on end cap 212. Electrode terminals 25 can be used for electrical connection with electrode assembly 22 for outputting or inputting electrical energy into battery cell 20. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 212. The insulating structure can be used to isolate the electrical connection components within the housing 211 from the end cap 212 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0154] Electrode assembly 22 is the component in the battery cell 20 where electrochemical reactions occur. The casing 211 may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body of the cell assembly, while the portions without active material each constitute tabs 221. The positive and negative tabs may be located together at one end of the main body or at opposite ends. During charging and discharging, the positive and negative active materials react with the electrolyte, and the tabs 221 connect to the electrode terminals 25 to form a current loop.

[0155] Electrode lead 23 is a component used to extract electrical energy from the battery cell 20. Electrode lead 23 is connected to electrode terminal 25 and busbar component 30 (see also...). Figure 2It is connected to electrode lead-out component 23.

[0156] An insulating structure is provided between the electrode lead-out 23 and the end cap 212 to insulate and isolate the electrode lead-out 23 and the end cap 212.

[0157] Please see Figure 3 See also Figure 4 , Figure 4 This is a perspective view of the electrode leads provided in some embodiments of this application. Figure 5 This is a schematic diagram illustrating the assembly of an electrode lead-out member with a first wall according to some embodiments of this application. According to some embodiments of this application, a battery cell 20 is provided, comprising a housing 21, an electrode assembly 22, and an electrode lead-out member 23. The housing 21 has a first wall 213, the electrode assembly 22 is disposed within the housing 21, and the electrode lead-out member 23 is mounted on the first wall 213; the electrode lead-out member 23 is used to lead out the electrical energy from the electrode assembly 22. The electrode lead-out member 23 includes a first surface 23b, the plane containing the first surface 23b intersects the first wall 213, and the first surface 23b is used to connect with a busbar component 30 (see [link to application]). Figure 2 )connect.

[0158] The first wall 213 is a wall of the outer shell 21. The first wall 213 and other walls enclose the receiving space of the outer shell 21, and the electrode assembly 22 is disposed in the receiving space.

[0159] In the diagram, the direction indicated by the letter Z is the thickness direction of the first wall 213.

[0160] The first surface 23b is the surface of the electrode lead 23 used for connection with the busbar component 30. The plane containing the first surface 23b intersects the first wall 213. The plane can be parallel to the thickness direction Z of the first wall 213, or it can be inclined to the thickness direction Z of the first wall 213. For example, the angle θ between the plane containing the first surface 23b and the first wall 213 is 60° to 120°; more preferably, the angle θ is 85° to 95°; preferably, the plane containing the first surface 23b can be perpendicular to the first wall 213, that is, the plane containing the first surface 23b can be parallel to the thickness direction Z of the first wall 213, so as to facilitate the connection between the first surface 23b and the busbar component 30. The first surface 23b is the surface of the electrode lead 23 closest to the edge of the first wall 213 along the length direction of the battery cell 20.

[0161] Please refer to Figure 6 The electrode lead-out member 23 can be a block structure, and the first surface 23b of the electrode lead-out member 23 is used to connect with the busbar member 30.

[0162] According to the embodiments of this application, in the battery cell 20, the plane containing the first surface 23b intersects with the first wall 213, facilitating the welding of the busbar component 30 and the electrode lead 23, thereby improving the assembly convenience of the busbar component 30 and the electrode lead 23, and thus improving the assembly efficiency of the battery 100 composed of the battery cell 20. For example, when the plane containing the first surface 23b is perpendicular to the first wall 213, the busbar component 30 and the electrode lead 23 can be welded in a direction parallel to the first wall 213, improving assembly convenience.

[0163] According to some embodiments of this application, the plane containing the first surface 23b is perpendicular to the first wall 213.

[0164] It should be noted that the plane containing the first surface 23b is perpendicular to the first wall 213, meaning that the angle θ between the plane containing the first surface 23b and the first wall 213 is approximately 90°. For example, the angle θ can be 85° to 95°. Specifically, the angle θ can be 85°, 86°, 87°, 88°, 89°, 90°, 91°, 92°, 93°, 94°, or 95°.

[0165] According to some embodiments of this application, such as Figure 4 and Figure 5 As shown, the electrode lead-out component 23 also includes a second surface 23a. The plane containing the second surface 23a intersects with the first surface 23b. The area of ​​the second surface 23a is D1, and the area of ​​the first surface 23b is D2, satisfying 0.1≤D2 / D1≤10.

[0166] When there is a groove, through hole or stepped hole on the second surface 23a, the area of ​​the second surface 23a is the area of ​​the second surface 23a occupied by the groove, through hole or stepped hole removed.

[0167] The first surface 23b is a plane, and the area of ​​the first surface 23b is the area of ​​the plane. The first surface 23b is the surface of the electrode lead 23 used to fit with the busbar component.

[0168] The ratio of the area D2 of the first surface 23b to the area D1 of the second surface 23a satisfies the above relationship, which can balance the energy density and current-carrying area of ​​the battery 100. When D2 / D1 < 0.1, D2 is too small, the welding area between the busbar 30 and the electrode lead 23 is too small, affecting the current-carrying capacity; or, D1 is too large, the area occupied by the electrode lead 23 in the direction perpendicular to the thickness Z of the first wall 213 is too large, occupying the space of the electrode assembly 22 and affecting the energy density. When 10 < D2 / D1, D2 is too large, the space occupied by the electrode lead 23 in the thickness Z of the first wall 213 is too large, affecting the energy density; or, D1 is too small, the connection area between the electrical connection component (such as the electrode terminal) between the tab 221 and the electrode lead 23 and the electrode lead 23 is too small, affecting the current-carrying capacity.

[0169] The second surface 23a is the surface of the electrode lead-out member 23 located outside the outer shell 21, and the second surface 23a protrudes from the first wall 213 along the thickness direction Z of the first wall 213.

[0170] According to some embodiments of this application, 0.5 ≤ D2 / D1 ≤ 2.

[0171] When the ratio of the area D2 of the first surface 23b to the area D1 of the second surface 23a satisfies 0.5≤D2 / D1≤2, compared with 0.1≤D2 / D1<0.5 and 2<D2 / D1≤10, the welding area between the electrode lead 23 and the busbar 30, and the welding area between the electrode lead 23 and the electrode terminal can be further guaranteed, resulting in better overcurrent capacity. Furthermore, the area occupied by the electrode lead 23 is smaller, and the energy density of the battery 100 is greater.

[0172] According to some embodiments of this application, such as Figure 4 and Figure 5 As shown, along the thickness direction Z of the first wall 213, the size of the first surface 23b is W1, which satisfies 1mm≤W1≤10mm, preferably 2mm≤W1≤5mm.

[0173] In the above scheme, along the thickness direction Z of the first wall 213, the size W1 of the first surface 23b satisfies the above relationship, so that the first surface 23b and the busbar component 30 can have a large connection area, so that the first surface 23b and the busbar component 30 can be connected.

[0174] According to some embodiments of this application, such as Figure 4 and Figure 5 As shown, the electrode lead-out member 23 also includes a second surface 23a, the plane containing the second surface 23a intersecting the first surface 23b. The electrode lead-out member 23 is disposed on the first wall 213 away from the battery cell 20 (see [link to documentation]). Figure 3On one side inside, the electrode lead-out member 23 includes a first part 231 and a second part 232. The first part 231 is electrically connected to the tab 221 of the electrode assembly 22, and the second part 232 is used to connect to the busbar component 30 (see [link]). Figure 2 The second surface 23a is the surface of the first part 231 that is away from the first wall 213, and the first surface 23b is the surface of the second part 232.

[0175] The first part 231 and the second part 232 are two components of the electrode lead-out member 23. The first part 231 and the second part 232 realize the electrical connection between the electrode lead-out member 23 and the tab 221 and the busbar 30.

[0176] In the above scheme, the electrode lead-out member 23 is disposed on the side of the first wall 213 facing away from the interior of the battery cell 20, so as to facilitate the connection between the electrode lead-out member 23 and the busbar component 30; the first part 231 and the second part 232 are respectively used to realize the connection with the tab 221 and the busbar component 30, and the first part 231 and the tab 221 can be connected through the electrode terminal 25 (see Figure 3 The connection is beneficial to increase the connection area between the electrode lead-out member 23 and the electrode terminal 25, and the connection area between the electrode lead-out member 23 and the busbar 30.

[0177] like Figure 7 and Figure 9 As shown, according to some embodiments of this application, the battery cell 20 further includes an electrode terminal 25, the first wall 213 is provided with an electrode lead-out hole 2131, one end of the electrode terminal 25 is connected to the first part 231, and the other end of the electrode terminal 25 is electrically connected to the tab 221 of the electrode assembly 22 through the electrode lead-out hole 2131.

[0178] The other end of the electrode terminal 25 can be electrically connected to the tab 221 of the electrode assembly 22 through the electrode lead-out hole 2131. Alternatively, the electrode terminal 25 can be inserted through the electrode lead-out hole 2131, and the end of the electrode terminal 25 near the inside of the outer casing 21 can be electrically connected to the tab 221 of the electrode assembly 22. Or, the adapter 26 can be inserted through the electrode lead-out hole 2131, and the electrode terminal 25 can be electrically connected to the tab 221 of the electrode assembly 22 through the adapter inserted through the electrode lead-out hole 2131.

[0179] The first part 231 and the tab 221 of the electrode assembly 22 are electrically connected through the electrode terminal 25 to guide the electrical energy of the electrode assembly 22 to the electrode lead-out member 23 so that the electrode lead-out member 23 can draw out the electrical energy of the electrode assembly 22.

[0180] According to some embodiments of this application, such as Figure 4 and Figure 5As shown, along the thickness direction Z of the first wall 213, at least part of the second portion 232 extends beyond the first portion 231.

[0181] At least part of the second part 232 extends beyond the first part 231. This can be either a portion of the second part 232 extending beyond the first part 231, or the entire second part 232 extending beyond the first part 231.

[0182] The first part 231 can be perpendicular to the second part 232, that is, the angle between the first part 231 and the second part 232 can be 90°; or, the first part 231 and the second part 232 can also be tilted, and the angle between the first part 231 and the second part 232 can also be an acute angle or an obtuse angle.

[0183] Please refer to Figure 7 The fact that at least part of the second portion 232 extends beyond the first portion 231 can be implemented in various ways. For example, the second portion 232 can be formed by extending the first portion 231 in a direction away from the first wall 213. In this case, the electrode lead-out member 23 is generally in the shape of... shape; The horizontal segment is the first part, 231. The vertical segment is the second part, 232.

[0184] Please refer to Figure 8 Alternatively, the second part 232 can be formed by extending the first part 231 towards the first wall 213, in which case the electrode lead-out part 23 is generally shaped as follows: shape; The horizontal segment is the first part, 231. The vertical section is the second part 232. The first part 231 extends beyond the first wall 213 in the direction close to the second part 232, and the second part 232 extends from the portion of the first part 231 that extends beyond the first wall 213 in the direction close to the first wall 213. At this time, the second part 232 is on the outside of the housing 21, making it easier to connect with the busbar component.

[0185] For example, refer to Figure 8 In the direction perpendicular to the first surface 23b, the projection of the second part 232 overlaps with the projection of the housing 211. That is, the housing 21 includes the housing 211 and the end cap 212, and the first wall 213 is the end cap 212. In the thickness direction of the end cap 212, the second part 232 partially overlaps with the housing 211. The above solution can increase the size of the second part 232, thereby increasing the area of ​​the first surface 23b, which facilitates the welding of the busbar component 30.

[0186] For example, the busbar component 30 has a flat plate structure.

[0187] Please refer to Figure 9Alternatively, the second part 232 can extend from the first part 231 both towards the first wall 213 and away from the first wall 213. In this case, the electrode lead-out part 23 is generally shaped as follows: The horizontal segment is the first part, 231. The vertical section is the second part 232. The second part 232 extends outside the housing 21, making it easier to connect to the busbar and providing a larger weldable area on the first surface 23b.

[0188] For example, refer to Figure 9 In a direction perpendicular to the first surface 23b, the projection of the second portion 232 overlaps with the projection of the housing 211, and along the direction from the first wall 213 toward the electrode lead 23, the second portion 232 extends beyond the recess 2141 of the battery cell 20 adjacent to the first wall 213. This design can increase the size of the second portion 232, thereby increasing the area of ​​the first surface 23b and facilitating the welding of the busbar component 30. For example, the busbar component 30 has a flat plate structure.

[0189] Please refer to Figure 10 For example, the second part 232 is formed by extending from the middle of the first part 231 in a direction away from the first wall 213. At this time, the electrode lead-out part 23 is roughly in the shape of "⊥", the horizontal segment of "⊥" is the first part 231, and the vertical segment of "⊥" is the second part 232.

[0190] In the above scheme, at least part of the second part 232 extends beyond the first part 231 along the thickness direction Z of the first wall 213 to increase the area of ​​the first surface 23b, which facilitates the connection between the second part 232 and the busbar component 30 and increases the connection area.

[0191] Please refer to Figure 7 According to some embodiments of this application, the electrode lead-out 23 extends beyond the edge of the first wall 213, and the first surface 23b is located in the portion of the electrode lead-out 23 that extends beyond the first wall 213.

[0192] like Figure 7 As shown, a portion of the electrode lead-out 23 extends beyond the edge of the first wall 213. When viewed in a direction perpendicular to the first wall 213, a portion of the projection of the electrode lead-out 23 is located outside the first wall 213, and the projection of the first surface 23b does not overlap with the first wall 213, so that the electrode lead-out 23 can be electrically connected to the busbar 30.

[0193] In this scheme, the busbar component 30 can be a flat plate structure. The structure of the busbar component 30 is simple and easy to process and manufacture.

[0194] According to some embodiments of this application, the electrode lead-out member 23 includes a first part 231 and a second part 232. The first part 231 is electrically connected to the tab 221 of the electrode assembly 22. The second part 232 is used to connect to the busbar member 30. The second part 232 extends beyond the edge of the first wall 213. The second part 232 extends along the thickness direction Z of the first wall 213 and protrudes from the first part 231. The first surface 23b is the surface of the second part 232 that faces away from the first part 231.

[0195] The second part 232 and the first part 231 are arranged in a direction parallel to the first wall 213. Along the thickness direction Z of the first wall 213, the projection of the second part 232 does not overlap with the first wall 213.

[0196] Since the second part 232 is used to connect the busbar component 30, and the second part 232 extends beyond the edge of the first wall 213, and the first surface 23b is the surface of the second part 232 that is far away from the first part 231, when the busbar component 30 is connected to the first surface 23b, the busbar component 30 can have a certain distance from the first wall 213, reducing the risk of interference between the busbar component 30 and the first wall 213, and reducing the risk of short circuit between the busbar component 30 and the housing 21, so as to facilitate the assembly of the busbar component 30 and the electrode lead-out component 23.

[0197] According to some embodiments of this application, such as Figure 4 and Figure 5 As shown, the first part 231 and the second part 232 are arranged along the first direction X, the first surface 23b is the surface of the second part 232 that is away from the first part 231 along the first direction X, and the first direction X is perpendicular to the thickness direction Z of the first wall 213.

[0198] In the diagram, the direction indicated by the letter X is the first direction, which can be the length direction of the battery cell 20. When the first surface 23b is perpendicular to the first wall 213, the first direction X is perpendicular to the first surface 23b.

[0199] The first surface 23b is the surface of the electrode lead-out 23 closest to the edge of the first wall 213 in the first direction X.

[0200] The second part 232 may be close to the edge of the first wall 213 relative to the first part 231 in order to facilitate the connection between the busbar 30 and the electrode lead-out 23.

[0201] In the above scheme, the first part 231 and the second part 232 are arranged along the first direction X, and the first surface 23b is the surface of the second part 232 that is away from the first part 231 along the first direction X, which facilitates the assembly of the electrode lead-out member 23 and the busbar 30.

[0202] According to some embodiments of this application, the first portion 231 is parallel to the first wall 213.

[0203] The first part 231 is parallel to the first wall 213, meaning that the thickness direction of the first part 231 is parallel to the thickness direction Z of the first wall 213. When the first wall 212 is a component with a convex bulge, the first part 231 is parallel to the flatter, larger area portion of the first wall 213. The parallelism of the first part 231 to the first wall 213 also means that the first part 231 and the first wall 213 are positioned opposite each other, or that the largest surface of the first part 231 is positioned opposite the first wall 213. It does not mean that both surfaces of the first part 231 along the thickness direction Z of the first wall 213 must be parallel to the first wall 213.

[0204] In the above scheme, the first part 231 is parallel to the first wall 213, which facilitates the assembly of the first part 231.

[0205] According to some embodiments of this application, such as Figure 4 and Figure 5 As shown, at least part of the second portion 232 extends in a direction away from the first wall 213 and beyond the third surface 23a.

[0206] At least a portion of the second portion 232 extends beyond the second surface 23a. This can be a part of the second portion 232 extending beyond the second surface 23a, or the entire second portion 232 extending beyond the second surface 23a.

[0207] The second part 232 can be perpendicular to the plane containing the second surface 23a, that is, the angle between the second part 232 and the second surface 23a can be 90°; or, the plane containing the second part 232 and the second surface 23a can also be inclined, and the angle between the plane containing the second part 232 and the second surface 23a can also be acute or obtuse.

[0208] In the above scheme, at least a portion of the second part 232 extends beyond the second surface 23a along the thickness direction Z of the first wall 213, such that at least a portion of the second part 232 is located on the side of the second surface 23a away from the first wall 213, so as to reduce the interference between the second part 232 and the first wall 213 when the second part 232 is connected to the busbar 30.

[0209] According to some embodiments of this application, such as Figure 4 and Figure 5 As shown, the electrode lead-out component 23 also includes a third part 233, which is connected to the first part 231 and the second part 232.

[0210] The third part 233 is also a component of the electrode lead-out part 23. The third part 233 connects the first part 231 and the second part 232. The third part 233 can be integrally formed with the first part 231 and the second part 232, or the third part 233 can be fixed to the first part 231 and the second part 232, for example, the third part 233 can be welded to the first part 231 and the second part 232. Optionally, the first part 231, the third part 233 and the second part 232 can be integrally formed, for example, the first part 231, the third part 233 and the second part 232 can be stamped or bent.

[0211] In the above scheme, the third part 233 connects the first part 231 and the second part 232, so that there can be a certain distance between the first part 231 and the second part 232, so as to facilitate the connection between the electrode lead-out member 23 and the busbar member 30.

[0212] According to some embodiments of this application, such as Figure 4 and Figure 5 As shown, the third part 233 includes a first segment 2331 and a second segment 2332. The first segment 2331 extends from the first part 231 toward the wall away from the first wall 213 (see [link]). Figure 3 Extending in the direction of ), the second segment 2332 connects the first segment 2331 and the second part 232, and a gap is formed between the first segment 2331 and the second part 232.

[0213] The first segment 2331 and the second segment 2332 are two components of the third part 233. The first segment 2331 extends from the first part 231 toward the first wall 213, that is, the first segment 2331 is located on the side of the first part 231 away from the first wall 213. The second segment 2332 connects the first segment 2331 and the second part 232, and a gap is formed between the first segment 2331 and the second part 232, that is, at least part of the second segment 2332 is located between the first segment 2331 and the second part 232.

[0214] In the above scheme, a gap is formed between the first segment 2331 and the second part 232 so that the electrode lead 23 can deform to absorb the expansion stress generated when the battery cell expands.

[0215] According to some embodiments of this application, such as Figure 4 and Figure 5 As shown, the second part 232 extends from the second segment 2332 toward the first wall 213 (see [reference]). Figure 3 Extending in the direction of ), the first segment 2331, the second segment 2332, and the second part 232 form a U-shaped structure.

[0216] The second part 232 extends from the second segment 2332 toward the first wall 213. The second part 232 may be parallel to the first segment 2331, or the third part 232 may be inclined to the first segment 2331. Optionally, the second part 232 may be parallel to the first segment 2331.

[0217] In the above scheme, the first segment 2331, the second segment 2332 and the second part 232 form a U-shaped structure, which is simple and easy to form.

[0218] Please see Figure 3 See also Figure 11 and Figure 12 , Figure 11 This is a schematic diagram of the structure of the support member, the first insulating member, and the first insulating member provided in some embodiments of this application. Figure 12 This is a cross-sectional view of a partial structure of a battery cell provided in some embodiments of this application. According to some embodiments of this application, the battery cell 20 further includes a support member 241, which is inserted into the gap.

[0219] The support member 241 is inserted into the gap. The support member 241 can support the second part 232 when the busbar 30 is connected to the second part 232, so as to facilitate the connection between the second part 232 and the busbar 30.

[0220] When the support member 241 is inserted into the gap, the support member 241 may contact the surface of the first segment 2331 that forms the gap, or the support member 241 may contact the surface of the second part 232 that forms the gap, or the support member 241 may contact the surface of the first segment 2331 that forms the gap and the surface of the second part 232 that forms the gap.

[0221] According to some embodiments of this application, the two opposite sides of the support member 241 are in contact with the first segment 2331 and the second part 232, respectively.

[0222] like Figure 12 As shown, the two opposite sides of the support member 241 located in the gap are in contact with the surfaces of the first segment 2331 and the second part 232 that form the gap, respectively. The support member 241, in contact with the first segment 2331 and the second part 232, serves as a limiting element, restricting the positional movement of the second part 232 to ensure a stable connection between the second part 232 and the busbar component 30.

[0223] According to some embodiments of this application, the support member 241 is made of insulating material, and extends beyond both ends of the third part 233 along the second direction Y. The first direction Y is perpendicular to the thickness direction Z of the first wall 213 and parallel to the first surface 23b.

[0224] In the diagram, the direction indicated by the letter Y is the second direction, which can be the width direction of the battery cell 20.

[0225] The support component 241 can be made of plastic, rubber, etc.

[0226] The support member 241 is made of insulating material, and the support member 241 extends beyond both ends of the third part 233 along the second direction Y, thus having a good insulating effect.

[0227] According to some embodiments of this application, such as Figure 3 , Figure 11 and Figure 12 As shown, the battery cell 20 also includes a first insulating member 242, at least a portion of which is disposed between the first wall 213 and the first portion 231 to insulate and isolate the first wall 213 and the first portion 231.

[0228] The material of the first insulating component 242 can be plastic, rubber, etc.

[0229] At least a portion of the first insulating member 242 is disposed between the first wall 213 and the first part 231. This can be either a part of the first insulating member 242 disposed between the first wall 213 and the first part 231, or the entire first insulating member 242 disposed between the first wall 213 and the first part 231.

[0230] In the above solution, by disposing at least part of the first insulating member 242 between the first wall 213 and the first part 231, the first wall 213 and the first part 231 are separated, thereby improving the safety of the battery cell 20.

[0231] According to some embodiments of this application, the support member 241 is connected to the first insulating member 242.

[0232] The support member 241 is connected to the first insulating member 242. The support member 241 and the first insulating member 242 can be integrally formed, for example, the support member 241 and the first insulating member 242 can be thermoplastic formed, or the support member 241 and the first insulating member 242 can be snapped or glued.

[0233] In the above scheme, the support member 241 is connected to the first insulating member 242, so that the connection between the support member 241 and the first insulating member 242 is stable, so that the support member 241 can support the second part 232.

[0234] According to some embodiments of this application, along the second direction Y, the first insulating member 242 extends beyond both ends of the first portion 231, and the second direction Y is perpendicular to the thickness direction Z of the first wall 213 and parallel to the first surface 23b.

[0235] The first insulating element 242 extends beyond both ends of the first portion 231 along the second direction Y, so that the first portion 231 and the first wall 213 have a better insulation effect.

[0236] According to some embodiments of this application, such as Figure 3 , Figure 11 and Figure 12 As shown, the battery cell 20 also includes a second insulating member 243, at least a portion of which is disposed between the second portion 232 and the first wall 213 to insulate and isolate the second portion 232 from the first wall 213.

[0237] The material of the second insulating component 243 can be plastic, rubber, etc.

[0238] At least a portion of the second insulating member 243 is disposed between the second part 232 and the first wall 213. This can be a part of the second insulating member 243 disposed between the second part 232 and the first wall 213, or the entire second insulating member 243 disposed between the second part 232 and the first wall 213.

[0239] In the above solution, the second insulating member 243 is disposed between the second part 232 and the first wall 213 to insulate and separate the second part 232 from the first wall 213, thereby improving the safety of the battery cell 20.

[0240] According to some embodiments of this application, the second insulating member 243 is connected to the first insulating member 242.

[0241] The second insulating member 243 is connected to the first insulating member 242. The second insulating member 243 and the first insulating member 242 can be integrally formed, for example, the third insulating member 243 and the first insulating member 242 can be thermoplastically formed, or the second insulating member 243 and the first insulating member 242 can be snapped or bonded.

[0242] In the above scheme, the second insulating member 243 is connected to the first insulating member 242. The connection between the second insulating member 243 and the first insulating member 242 is stable, and the two can be integrally formed to facilitate assembly and positioning.

[0243] According to some embodiments of this application, the end of the second portion 232 that is away from the second segment 2332 abuts against the second insulating member 243.

[0244] The end of the second part 232 away from the second segment 2332 abuts against the second insulating member 243, which can restrict the movement of the second insulating member 243 along the thickness direction Z of the first wall 213.

[0245] According to some embodiments of this application, along the second direction Y, the second insulating member 243 extends beyond both ends of the second portion 232, and the second direction Y is perpendicular to the thickness direction Z of the first wall 213 and parallel to the first surface 23b.

[0246] The second insulating member 243 extends beyond both ends of the second part 232 along the second direction Y, so that the second part 232 has a better insulation effect with the first wall 213.

[0247] Please see Figure 13 , Figure 13 This is a schematic diagram of the structure of an electrode lead provided in some other embodiments of this application. According to some embodiments of this application, the thickness of the first portion 231 is greater than the thickness of the third portion 233, and / or, the thickness of the second portion 232 is greater than the thickness of the third portion 233.

[0248] In the diagram, the dimension indicated by the letter H1 is the thickness of the first part 231, the dimension indicated by the letter H2 is the thickness of the third part 233, and the dimension indicated by the letter H3 is the thickness of the second part 232.

[0249] When the electrode lead-out member 23 is unfolded, the thickness direction of the first part 231, the thickness direction of the second part 232, and the thickness direction of the third part 233 are all parallel to the thickness direction Z of the first wall 213. After the electrode lead-out member 23 is bent, the structure formed by the second part and the third part 233 is U-shaped, so the thickness direction of the third part 233 changes accordingly.

[0250] It should be noted that the thickness of the first part 231 mentioned here refers to the thickness of the first part 231 at the location where no groove, through hole or stepped hole or other structure is provided.

[0251] In embodiments where the thickness of the first part 231 is greater than the thickness of the third part 233, the larger thickness of the first part 231 enhances its strength and reduces the risk of the first part 231 being welded through during welding of the electrical connection components (such as electrode terminals 25) between the first part 231 and the tab 221 and the electrode lead-out member 23, thus meeting welding requirements.

[0252] In the embodiment where the thickness of the second part 232 is greater than the thickness of the third part 233, the larger thickness of the second part 232 can reduce the risk of the second part 232 being welded through when it is welded to the busbar component 30, thus meeting the welding requirements.

[0253] In embodiments where the thickness of the first part 231 is greater than the thickness of the third part 233 and the thickness of the second part 232 is greater than the thickness of the third part 233, both the first part 231 and the second part 232 have a relatively large thickness, which can meet the welding requirements and reduce the risk of the first part 231 and the second part 232 being welded through.

[0254] Please see Figure 13 See also Figure 14 , Figure 14 for Figure 13 A top view. According to some embodiments of this application, the first part 231, the third part 233, and the second part 232 are arranged sequentially along the first direction X. The dimension of the third part 233 along the second direction Y is greater than the dimension of the first part 231 along the second direction Y, and the dimension of the third part 233 along the second direction Y is greater than the dimension of the second part 232 along the second direction Y. The first direction X, the second direction Y, and the thickness direction Z of the first wall 213 are perpendicular to each other.

[0255] The first direction X is the arrangement direction of the first part 231, the third part 233, and the second part 232.

[0256] In the figure, the dimension indicated by the letter L1 is the dimension of the first part 231 along the second direction Y, the dimension indicated by the letter L3 is the dimension of the third part 233 along the third direction Y, and the dimension indicated by the letter L2 is the dimension of the second part 232 along the second direction Y.

[0257] In embodiments where the thickness of the first portion 231 is greater than the thickness of the third portion 233, and / or the thickness of the second portion 232 is greater than the thickness of the third portion 233, since the thickness of the third portion 233 is smaller, the size of the third portion 233 is the largest along the second direction Y compared to the first portion 231 and the second portion 232, which enables the third portion 233 to have a larger flow area to meet the flow requirements.

[0258] Please see Figure 13 and Figure 14 See also Figures 15 to 17 , Figure 15 This is a schematic diagram of the flow cross-section of the first part provided in some embodiments of this application. Figure 16 This is a schematic diagram of the flow cross-section of the third part provided in some embodiments of this application. Figure 17This is a schematic diagram of the flow cross-section of the second part provided in some embodiments of this application. According to some embodiments of this application, the flow cross-sectional area of ​​the first part 231 is S1, the flow cross-sectional area of ​​the third part 233 is S2, and the flow cross-sectional area of ​​the second part 232 is S3; wherein, 0.2≤S1 / S2≤5, 0.2≤S2 / S3≤5, 0.2≤S1 / S3≤5; preferably, 0.5≤S1 / S2≤2, 0.5≤S2 / S3≤2, 0.5≤S1 / S3≤2.

[0259] Optionally, the ratio S1 / S2 of the flow cross-sectional area S1 of the first part 231 and the flow cross-sectional area S2 of the third part 233 can be 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.

[0260] Optionally, the ratio S2 / S3 of the flow cross-sectional area S2 of the third part 233 to the flow cross-sectional area S3 of the second part 232 can be 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.

[0261] Optionally, the ratio S1 / S3 of the flow cross-sectional area S1 of the first part 231 and the flow cross-sectional area S3 of the second part 232 can be 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.

[0262] S1 = H1 * L1, S2 = H2 * L2, S3 = H4 * L3. Wherein, H4 is the dimension of the second part 232 in the thickness direction Z parallel to the first wall 213.

[0263] The current-carrying area S1 of the first part 231, the current-carrying area S2 of the second part 232, and the current-carrying area S3 of the third part 233 satisfy 0.2≤S1 / S2≤5, 0.2≤S2 / S3≤5, and 0.2≤S1 / S3≤5, which makes the electrode lead-out part 23 as a whole have better current-carrying capacity.

[0264] When 0.5≤S1 / S2≤2, 0.5≤S2 / S3≤2, and 0.5≤S1 / S3≤2, the overall current-carrying capacity of the electrode lead-out component 23 is better than that of 0.2≤S1 / S2≤5, 0.2≤S2 / S3≤5, and 0.2≤S1 / S3≤5.

[0265] According to some embodiments of this application, the thickness of the first part 231 is H1, satisfying 0.2mm≤H1≤5mm, preferably 0.5mm≤H1≤4mm; or the thickness of the third part 233 is H2, satisfying 0.2mm≤H2≤2mm, preferably 0.3mm≤H2≤1.2mm; or the thickness of the second part 232 is H3, satisfying 0.2mm≤H3≤5mm, preferably 0.5mm≤H3≤4mm.

[0266] Optionally, the thickness H1 of the first part 231 can be 0.2mm, 0.25mm, 0.5mm, 0.75mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.25mm, 4.5mm, 4.75mm, 5mm, etc.

[0267] Optionally, the thickness H2 of the third part 233 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.

[0268] Optionally, the thickness H3 of the second part 232 can be 0.2mm, 0.25mm, 0.5mm, 0.75mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.25mm, 4.5mm, 4.75mm, 5mm, etc.

[0269] The thickness H1 of the first part 231 satisfies the above relationship. When the first part 231 has a better current carrying capacity, the first part 231 is not easy to be soldered through, thus improving the assembly safety of the battery 100. The thickness H2 of the third part 233 satisfies the above relationship. When the third part 233 has a larger current carrying area, it is easy to bend the third part 233. The thickness H3 of the second part 232 satisfies the above relationship. When the second part 232 has a better current carrying capacity, the second part 232 is not easy to be soldered through, thus improving the assembly safety of the battery 100.

[0270] Compared with 0.2 mm < H1 < 0.5 mm, when 0.5 mm ≤ H1 ≤ 4 mm, the thickness H1 of the first part 231 is not easily welded through, and the battery 100 has high safety during assembly; compared with 4 mm < H1 ≤ 5 mm, when 0.5 mm ≤ H1 ≤ 4 mm, the first part 231 occupies less space in the thickness direction Z of the first wall 213, making the battery 100 have a high energy density.

[0271] Compared with 0.2 mm ≤ H2 < 0.3 mm, when 0.3 mm ≤ H2 ≤ 1.2 mm, the thickness H2 of the third part 233 is relatively thick and not easily broken; compared with 1.2 mm < H2 ≤ 2 mm, when 0.3 mm ≤ H2 ≤ 1.2 mm, the thickness H2 of the third part 233 is relatively thin and easy to bend, facilitating the bending of the third part 233.

[0272] Compared with 0.2 mm ≤ H3 < 0.5 mm, when 0.5 mm ≤ H3 ≤ 4 mm, the thickness H3 of the second part 232 is not easily welded through, and the battery 100 has high safety during assembly; compared with 4 mm < H3 ≤ 5 mm, when 0.5 mm ≤ H3 ≤ 4 mm, the second part 232 occupies less space in the direction perpendicular to the first surface 23b, reducing costs.

[0273] Please refer to Figure 3 and Figure 12 According to some embodiments of the present application, the battery cell 20 further includes an electrode terminal 25. The first wall 213 is provided with an electrode lead-out hole 2131. The electrode terminal 25 passes through the electrode lead-out hole 2131. One end of the electrode terminal 25 is connected to the electrode lead-out member 23, and the other end of the electrode terminal 25 is electrically connected to the tab 221 of the electrode assembly 22.

[0274] The electrode terminal 25 is a conductive component. The electrode terminal 25 can be a cylinder for easy processing and manufacturing. Optionally, the electrode lead-out hole 2131 can be a round hole.

[0275] In the embodiment where the electrode lead-out member 23 is disposed on the side of the first wall 213背离 the interior of the battery cell 20, the electrode terminal 25 passes through the electrode lead-out hole 2131, facilitating the connection between the electrode terminal 25 and the electrode lead-out member 23.

[0276] According to some embodiments of the present application, as Figure 3 and Figure 4 shown, the number of electrode terminals 25 and the number of electrode lead-out holes 2131 are both multiple. The electrode terminals 25 and the electrode lead-out holes 2131 correspond to each other one by one. The electrode lead-out member 23 is provided with a first groove 234, and the first groove 234 is located between two adjacent electrode terminals 25.

[0277] Optionally, the number of electrode terminals 25 and the number of electrode lead-out holes 2131 are both two.

[0278] The first groove 234 is a recessed part of the electrode lead 23, which can reduce the weight of the electrode lead 23.

[0279] The electrode terminals 25 and the electrode lead-out holes 2131 are both multiple, providing excellent current-carrying capacity. The first groove 234 can reduce the weight of the electrode lead-out member 23 without affecting the current-carrying capacity.

[0280] According to some embodiments of this application, such as Figure 4 As shown, the first groove 234 extends to the edge of the electrode lead-out 23.

[0281] The electrode lead-out member 23 includes a second surface 23a, a fifth surface 23c facing the first insulating member 242, and a side surface 23d. The second surface 23a is disposed away from the first wall 213. The second surface 23a and the fifth surface 23c are two surfaces of the electrode lead-out member 23 disposed opposite to each other along the thickness direction Z of the first wall 213. The side surface 23d of the electrode lead-out member 23 connects the second surface 23a and the fifth surface 23c. The first groove 234 is formed by recessing the fifth surface 23c toward the second surface 23a.

[0282] The first groove 234 extending to the edge of the electrode lead 23 means that the first groove 234 extends to the side surface 23d of the electrode lead 23.

[0283] In the above scheme, the first groove 234 extends to the edge of the electrode lead 23 so that the first groove 234 can be processed on the edge of the electrode lead 23, reducing the processing difficulty.

[0284] According to some embodiments of this application, the first groove 234 penetrates through the electrode lead 23 along the thickness direction of the electrode lead 23, thereby reducing the weight of the electrode lead 23.

[0285] Please see Figure 3 and Figure 12 See also Figure 18 and Figure 19 , Figure 18 This is a cross-sectional view of a battery cell provided in some embodiments of this application. Figure 19 for Figure 18 A partial enlarged view at point A. According to some embodiments of this application, the battery cell 20 further includes a first insulating member 242, at least a portion of which is disposed between the first wall 213 and the electrode lead 23 to insulate and isolate the first wall 213 from the electrode lead 23. The first insulating member 242 includes a first protrusion 2421, which is inserted into the first groove 234.

[0286] The first insulating member 242 includes a sixth surface 242a facing away from the first wall 213 and a seventh surface 242b facing the first wall 213, and a first protrusion 2421 protrudes from the sixth surface 242a.

[0287] In the above scheme, the first insulating member 242 is used to insulate and isolate the first wall 213 from the electrode lead-out member 23, thereby separating the first wall 213 from the electrode lead-out member 23; the first protrusion 2421 is inserted into the first groove 234 to facilitate the positioning of the electrode lead-out member 23.

[0288] According to some embodiments of this application, such as Figure 19 As shown, the first wall 213 includes a third surface 213a that is away from the interior of the battery cell 20. The third surface 213a has a second protrusion 2132 to strengthen the first wall 213.

[0289] In some embodiments, the first insulating member 242 includes a second groove 2422, and a second protrusion 2132 is inserted into the second groove 2422.

[0290] The first wall 213 also includes a fourth surface (not shown in the figure) facing the interior of the battery cell 20. The third surface 213a and the fourth surface are two opposing surfaces in the thickness direction Z of the first wall 213. The second protrusion 2132 protrudes from the third surface 213a.

[0291] The second groove 2422 is provided on the seventh surface 242b.

[0292] In the above scheme, the second protrusion 2132 cooperates with the second groove 2422 to position the first insulating member 242, facilitating the assembly of the first insulating member 242 with the first wall 213. Figure 16 As shown, the second groove 2422 can be a through hole.

[0293] The second groove 2422 and the first protrusion 2421 are respectively arranged in the thickness direction Z of the first wall 213 to make reasonable use of the space of the first insulating member 242.

[0294] According to some embodiments of this application, such as Figure 12 As shown, the battery cell 20 also includes an adapter 26, through which the electrode lead 23 can be electrically connected to the tab 221 via the electrode terminal 25 and the adapter 26. For example, as Figure 12 As shown, tab 221 is connected to adapter 26, adapter 26 is connected to electrode terminal 25, and electrode terminal 25 is connected to electrode lead-out member 23, thereby realizing the electrical connection between tab 221 and electrode lead-out member 23.

[0295] like Figure 12As shown, the battery cell 20 also includes a third insulating member 27, which is disposed on the side of the first wall 213 facing the inside of the battery cell 20. The third insulating member 27 is disposed between the first wall 213 and the adapter 26, and is used to insulate and isolate the first wall 213 and the electrode terminal 25.

[0296] Understandably, the battery cell 20 may also not include the adapter 26, in which case the tab is connected to the electrode terminal.

[0297] According to some embodiments of this application, the outer shell 21 includes a first wall 213 and a second wall 214 disposed opposite to each other along the thickness direction Z of the first wall 213, a third wall and a fourth wall disposed opposite to each other along the first direction X, and a fifth wall and a sixth wall disposed opposite to each other along the second direction Y. The areas of the third wall and the fourth wall are both smaller than the area of ​​the first wall 213, the areas of the third wall and the fourth wall are both smaller than the area of ​​the second wall, the areas of the fifth wall and the sixth wall are both smaller than the area of ​​the first wall 213, and the areas of the fifth wall and the sixth wall are both smaller than the area of ​​the second wall 214. The first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

[0298] In some embodiments, the first wall 213 is the wall with the largest area among all the walls of the outer casing 21.

[0299] The battery cell 20 can be rectangular, and the first wall 213 can be the wall with the largest area among all the walls of the battery cell 20. In other words, the large surface of the battery cell 20 is set as the first wall 213. The thickness direction Z of the first wall 213 can be the thickness direction of the battery cell 20.

[0300] It should be noted that, in the above-mentioned wall, the area of ​​the wall is , and when viewed along a direction perpendicular to the wall, the area of ​​the projection of the wall is the area of ​​the wall.

[0301] According to some embodiments of this application, such as Figure 3 As shown, the outer casing 21 includes a housing 211 and an end cap 212. The housing 211 has an opening, and the end cap 212 closes the opening. The first wall 213 is the end cap 212.

[0302] The first wall 213 is an end cap 212, which facilitates the assembly of the electrode lead-out part 23.

[0303] Please see Figure 2 See also Figure 20 and Figure 21 , Figure 20 for Figure 2 A magnified view of part B. Figure 21This is a schematic diagram of the structure of a return current component provided in some embodiments of this application. According to some embodiments of this application, a battery 100 is provided, comprising a housing 10, a current collector 30, and a plurality of battery cells 20 as provided in the above embodiments. The current collector 30 is housed within the housing 10; the plurality of battery cells 20 are housed within the housing 10, and the plurality of battery cells 20 are stacked along the thickness direction Z of the first wall 213, with electrode leads 23 of the plurality of battery cells 20 electrically connected through the current collector 30.

[0304] According to the embodiments of this application, the battery 100 employs the aforementioned battery cell 20, which can improve the assembly efficiency of the electrode lead-out member 23 of the battery cell 20 and the busbar component 30, thereby improving the assembly efficiency of the battery 100.

[0305] According to some embodiments of this application, in the thickness direction Z of the first wall 213, the projection of the end of the busbar 30 at least partially overlaps with the first wall 213.

[0306] The projection of the end of the busbar component 30 at least partially overlaps with the first wall 213 to save assembly space, make the internal components of the battery 100 more compact, and improve the energy density of the battery 100.

[0307] According to some embodiments of this application, such as Figure 20 As shown, the electrode lead-out 23 is welded to the busbar component 30 to form a solder area P. Along the thickness direction Z of the first wall 213, the first surface 23b (see [reference]) Figure 4 The size of the solder area P is W1, and the size of the solder area P is W2, satisfying 0.01≤W2 / W1≤0.5, preferably 0.1≤W2 / W1≤0.3.

[0308] Optionally, the ratio W2 / W1 of the size W2 of the solder area P to the size W1 of the first surface 23b can be 0.01, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, etc.

[0309] The solder mark area P is the area that displays the solder mark formed at the welding position of the electrode lead-out member 23 and the busbar member 30 after the electrode lead-out member 23 is welded together with the busbar member 30.

[0310] The ratio of the dimension W2 of the solder area P to the dimension W1 of the first surface 23b satisfies the above relationship, resulting in better current carrying capacity, higher connection strength, and better safety of the battery cell 20 at the welded joint. If the ratio of the dimension W2 of the solder area P to the dimension W1 of the first surface 23b is too small, it will lead to poor current carrying capacity and insufficient connection strength at the welded joint; if the ratio of the dimension W2 of the solder area P to the dimension W1 of the first surface 23b is too large, it may cause the local welded position to extend beyond the second part, resulting in the local insulation structure being melted, affecting the assembly safety of the battery 100.

[0311] Compared to 0.01≤W2 / W1<0.1, when 0.1≤W2 / W1≤0.3, the welded part has better current carrying capacity and higher connection strength; compared to 0.3<W2 / W1≤0.5, when 0.1≤W2 / W1≤0.3, the welded part and the position where the electrode lead 23 is connected to the tab 221 have a larger overlap area, which makes the welding safety during the assembly of the battery 100 higher.

[0312] According to some embodiments of this application, along the second direction Y, the first surface 23b (see [reference]) Figure 4 The size of the solder area is F1, and the size of the solder area P is F2, satisfying 0.01≤F2 / F1≤0.5, preferably 0.1≤F2 / F1≤0.3. The second direction Y is perpendicular to the thickness direction Z of the first wall 213 and parallel to the first surface 23b.

[0313] Optionally, the ratio F2 / F1 of the dimension F2 of the solder area P in the second direction Y to the dimension F1 of the first surface 23b in the second direction Y can be 0.01, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, etc.

[0314] The ratio of the dimension F2 of the solder area P in the second direction Y to the dimension F1 of the first surface 23b in the second direction Y satisfies the above relationship, resulting in better current carrying capacity, higher connection strength, and better safety of the battery cell 20. If the ratio of the dimension F2 of the solder area P in the second direction Y to the dimension F1 of the first surface 23b in the second direction Y is too small, it will lead to poor current carrying capacity and insufficient connection strength at the solder joint; if the ratio of the dimension F2 of the solder area P in the second direction Y to the dimension F1 of the first surface 23b in the second direction Y is too large, it may cause the local solder joint to extend beyond the second part, resulting in the local insulation structure being melted, affecting the assembly safety of the battery 100.

[0315] Compared to 0.01≤F2 / F1<0.1, when 0.1≤F2 / F1≤0.3, the welded part has better current carrying capacity and higher connection strength; compared to 0.3<F2 / F1≤0.5, when 0.1≤F2 / F1≤0.3, the welded part and the position where the electrode lead 23 is connected to the tab 221 have a larger overlap area, which makes the welding safety during the assembly of the battery 100 higher.

[0316] According to some embodiments of this application, the area of ​​the first surface 23b is M1, and the area of ​​the solder area P is M2, satisfying 0.01≤M1 / M2≤0.5, preferably 0.1≤M1 / M2≤0.3.

[0317] Where M1 = W1 * F1, M2 = W2 * F2.

[0318] Optionally, the ratio M1 / M2 of the area M1 of the first surface 23b to the area M2 of the solder area P can be 0.01, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, etc.

[0319] In the above scheme, the ratio of the area M1 of the first surface 23b to the area M2 of the solder area P satisfies the above relationship, resulting in better current carrying capacity, higher connection strength, and better safety of the battery cell 20 at the solder joint. If the ratio of the area M2 of the solder area P to the area M1 of the first surface 23b is too small, it will lead to poor current carrying capacity and insufficient connection strength at the solder joint. When the busbar component 30 is laser welded to the electrode lead 23, if the ratio of the area M2 of the solder area P to the area M1 of the first surface 23b is too large, it will cause the local welding position to exceed the connection position between the electrode lead 23 and the tab 221, resulting in local insulation structure melting and laser leakage, affecting the assembly safety of the battery 100.

[0320] Compared to 0.01≤M2 / M1<0.2, when 0.2≤M2 / M1≤0.3, the welded part has better current carrying capacity and higher connection strength; compared to 0.3<M2 / M1≤0.5, when 0.2≤M2 / M1≤0.3, the welded part and the position where the electrode lead 23 is connected to the tab 221 have a larger overlap area, which makes the welding safety of the battery 100 assembly process higher.

[0321] According to some embodiments of this application, such as Figure 21As shown, the busbar component 30 includes a bottom wall 31, two side walls 32 and two flanges 33. The two side walls 32 are arranged opposite each other along the thickness direction Z of the first wall 213. The bottom wall 31 connects the two side walls 32. Each flange 33 extends from the end of the corresponding side wall 32 away from the bottom wall 31 in a direction away from the other side wall 32. The two flanges 33 are respectively connected to the electrode leads 23 of the two battery cells 20.

[0322] The bottom wall 31 is connected to two side walls 32 at both ends along the thickness direction Z of the first wall 213, and two flanges 33 are respectively provided with corresponding side walls 32.

[0323] The busbar component 30 has a bent structure, that is, the bottom wall 31, two side walls 32 and two flanges 33 are integrally formed. The side walls 32 are bent relative to the bottom wall 31, and the flanges 33 are bent relative to the side walls 32.

[0324] Multiple battery cells 20 include adjacent first battery cells and second battery cells. A busbar 30 is used to connect the electrode leads 23 of the first battery cell and the electrode leads 23 of the second battery cell. The busbar 30 bypasses the sidewall of the first battery cell that is parallel to the thickness direction Z of the first wall 213, such that one flange 33 of the busbar 30 is connected to the electrode lead 23 of the first battery cell, and the other flange 33 of the busbar 30 is connected to the electrode lead 23 of the second battery cell.

[0325] In the above scheme, the structure of the current collector 30 facilitates the connection between the current collector 30 and the first surface 23b of the electrode lead-out parts 23 of the two battery cells 20, making the internal components of the battery 100 compact.

[0326] According to some embodiments of this application, such as Figure 12 As shown, the housing 21 also has a second wall 214 disposed opposite to the first wall 213. A recess 2141 is formed in a first region of the edge of the second wall 214. When multiple battery cells 20 are stacked, the recess 2141 is used to accommodate at least a portion of the electrode leads 23 of the battery cell 20 adjacent to the second wall 214.

[0327] The second wall 214 and the first wall 213 are two walls of the outer shell 21 that are arranged opposite each other along the thickness direction Z of the first wall 213.

[0328] The first region is the edge of the second wall 214, along the thickness direction Z of the first wall 213, and corresponds to the region of the first wall 213 where the electrode lead-out member 23 is mounted. The first region is recessed towards the first wall 213 along the thickness direction Z of the first wall 213 to form a recess 2141.

[0329] The electrode lead-out 23 of the battery cell 20 adjacent to the second wall 214 may be partially located within the recess 2141, or the electrode lead-out 23 of the battery cell 20 adjacent to the second wall 214 may be entirely located within the recess 2141.

[0330] In some embodiments, the recess depth of the recess 2141 is greater than the height of the electrode lead 23 protruding from the first wall 213. It is understood that the electrode lead 23 of the battery cell 20 adjacent to the second wall 214 may also be partially accommodated within the recess 2141.

[0331] The surface of the second wall 214 may be provided with an insulating layer so that when multiple battery cells 20 are stacked, the second wall 214 is insulated from the electrode leads 23 of the adjacent battery cells 20. The insulating layer may also be provided on the surface of the electrode leads 23 away from the first wall so that when multiple battery cells 20 are stacked, the electrode leads 23 can be insulated from the second wall 214 of the battery cells adjacent to the first wall 213.

[0332] In the above scheme, when multiple battery cells 20 are stacked, the recess 2141 can accommodate the electrode lead-out part 23 of the battery cell 20 adjacent to the second wall 214, making reasonable use of the assembly space so that the battery 100 has a high energy density.

[0333] Please refer to Figure 7 According to some embodiments of this application, the busbar component 30 has a flat plate structure.

[0334] In an embodiment where the electrode lead-out 23 extends beyond the edge of the first wall 213 and the first surface 23b is located in the portion of the electrode lead-out 23 extending beyond the first wall 213, the busbar 30 can be a flat plate structure. The busbar 30 has a simple structure, is easy to process and manufacture, and has low manufacturing cost.

[0335] Please refer to Figure 7 According to some embodiments of this application, the electrode lead-out member 23 is at least partially accommodated in the recess 2141 of the battery cell 20 adjacent to the first wall 213. The electrode lead-out member 23 includes a first portion 231 and a second portion 232. The first portion 231 is electrically connected to the tab 221 of the electrode assembly 22. The second portion 232 is used to connect to the busbar 30. The second portion 232 extends beyond the edge of the first wall 213. The second portion 232 extends along the thickness direction Z of the first wall 213 and protrudes from the first portion 231. The first surface 23b is the surface of the second portion 232 facing away from the first portion 231. The second portion 232 extends beyond the recess 2141 of the battery cell 20 adjacent to the first wall 213.

[0336] The projection of the first surface 23b in a direction perpendicular to the first surface 23b is located outside the recess 2141, so that the busbar component 30 can be connected to the first surface 23b.

[0337] The second portion 232 extending beyond the recess 2141 of the adjacent battery cell 20 means that, when viewed along a direction perpendicular to the first surface 23b, a portion of the projection of the second portion 232 falls into the recess 2141, while another portion of the projection of the second portion 232 is located outside the recess 2141 and along the thickness direction Z of the first wall 213. This projection is located on the side of the recess 2141 away from the first wall 213 of the battery cell 20 opposite to the recess 2141. For example, the battery cell 20 may have a third wall 215 and a fourth wall arranged opposite each other along the first direction X. Taking the third wall 215 as an example, when viewed along a direction perpendicular to the first surface 23b, a portion of the projection of the second portion 232 falls into the recess 2141, while another portion of the projection of the second portion 232 overlaps with the third wall 215.

[0338] According to some embodiments of this application, please refer to Figure 8 , 9 The outer casing 21 includes a housing 211 and an end cap 212. The housing 211 has an opening, and the end cap 212 closes the opening. The first wall is the end cap 212. In a direction perpendicular to the first surface 23b, the projection of the second portion 232 overlaps with the projection of the housing 211.

[0339] When viewed along a direction perpendicular to the first surface 23b, the projection of the second part 232 partially overlaps with the housing 211, resulting in the second part 232 having a larger size in the arrangement direction of the end cap 212 and the housing 211. This, in turn, results in the first surface 23b having a larger area in the arrangement direction of the end cap 212 and the housing 211, thereby enabling the busbar component 30 and the electrode lead-out component 23 to have a larger connection area, and thus ensuring a firm connection between the busbar component 30 and the electrode lead-out component 23.

[0340] In the above scheme, the first surface 23b is located outside the recess 2141 and extends beyond the recess 2141 of the adjacent battery cell 20. The first surface 23b has a large dimension in the thickness direction Z of the first wall 213 so that the electrode lead 23 and the first surface 23b have a large connection area, thereby making the electrode lead 23 firmly connected to the busbar 30.

[0341] Please refer to Figure 22 According to some embodiments of this application, the battery 100 further includes an insulating layer 40, which is disposed on the surface of the electrode lead 23 facing the housing 21, and is used to insulate and isolate the electrode lead 23 from the housing 21.

[0342] The insulating layer 40 is an insulating component. The insulating layer 40 can be adhered to the surface of the electrode lead 23 facing the outer casing 21 of the adjacent battery cell 20, or the insulating layer 40 can be adhered to the surface of the electrode lead 23 facing the outer casing 21 of the battery cell 20 on which the electrode lead 23 is disposed. The insulating layer 40 can be made of plastic or rubber.

[0343] The isolation layer 40 can be disposed on one or more surfaces of the electrode lead 23. The isolation layer 40 can be arranged in an L-shape, and the isolation layer 40 can be disposed on two adjacent surfaces of the electrode lead 23.

[0344] In the above scheme, the isolation layer 40 is provided to insulate the electrode lead 23 from the outer shell 21 of the adjacent battery cell 20 or the outer shell 21 of the battery cell 20 where the electrode lead 23 is provided, thereby improving the safety of the battery 100.

[0345] According to some embodiments of this application, along the thickness direction Z of the first wall 213, two adjacent electrode leads 23 of two adjacent battery cells 20 have two opposite ends, and the two ends of the busbar 30 are respectively flush with the two ends. One end of the busbar 30 is flush with the end of the electrode lead 23 of one of the adjacent battery cells 20 that is close to the first wall 213, and the other end of the busbar 30 is flush with the end of the electrode lead 23 of the other of the adjacent battery cells 20 that is opposite to the first wall 213;

[0346] In some embodiments, along the second direction Y, the opposite ends of the busbar 30 are flush with the opposite ends of the electrode lead-out member 23, and the second direction Y, the thickness direction Z of the first wall 213, and the thickness direction of the busbar 30 are perpendicular to each other.

[0347] The thickness direction of the busbar component 30 can be perpendicular to the first surface 23b.

[0348] For example, along the thickness direction Z of the first wall 213, one end of the busbar 30 is flush with the end of the electrode lead 23 of a battery cell 20 that is close to the first wall 213 of that battery cell 20, and the other end of the busbar 30 is flush with the end of the electrode lead 23 of an adjacent battery cell 20 that is opposite to the first wall 213 of that battery cell 20. In other words, both ends of the busbar 30 are flush with the opposite ends of the two electrode leads 23 of the two battery cells 20, respectively.

[0349] In the above scheme, the two ends of the busbar component 30 in the thickness direction Z of the first wall 213 are respectively flush with the two opposite ends of the electrode leads 23 of the two adjacent battery cells 20, so as to facilitate the positioning of the busbar component 30 and the corresponding electrode leads 23 in the thickness direction Z of the first wall 213, and facilitate the connection between the busbar component 30 and the electrode leads 23; the two opposite ends of the busbar component 30 along the second direction Y are respectively flush with the two opposite ends of the electrode leads 23 along the second direction Y, so as to facilitate the positioning of the busbar component 30 and the corresponding electrode leads 23 in the second direction Y, and facilitate the connection between the busbar component 30 and the electrode leads 23.

[0350] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 provided in any of the above embodiments, the battery cell 20 being used to provide electrical energy.

[0351] The electrical equipment can be any of the aforementioned devices or systems that utilize battery cells 20.

[0352] According to some embodiments of this application, please refer to Figures 2 to 22This application provides a battery cell 20, which is a flat cuboid. The battery cell 20 includes a housing 21, an electrode assembly 22, an electrode lead-out member 23, an electrode terminal 25, a support member 241, a first insulating member 242, and a second insulating member 243. The housing 21 includes a shell 211 and an end cap. The shell 211 has an opening, and the end cap closes the opening. The electrode assembly 22 is disposed inside the shell 211, and the end cap is a first wall 213. The tabs 221 of the electrode assembly 22 extend from both ends of the battery cell 20 along its length. The electrode lead-out member 23 is disposed on the side of the first wall 213 facing away from the interior of the battery cell 20. The first wall 213 is provided with an electrode lead-out hole 2131, and the electrode terminal 25 passes through the electrode lead-out hole 2131. One end of the electrode terminal 25 is electrically connected to the tab 221 via an adapter 26. The electrode lead-out component 23 includes a first part 231, a second part 232, and a third part 233. The first part 231, the third part 233, and the second part 232 are arranged sequentially along a first direction X. The third part 233 includes a first segment 2331 and a second segment 2332. The first segment 2331 extends from the first part 231 in a direction away from the first wall 213. The second segment 2332 connects the first segment 2331 and the second part 232. The second part 232 extends from the second segment 2332 in a direction close to the first wall 213. The second part 232 is parallel to the first part 231. A gap is formed between the first segment 2331 and the second part 232. The first segment 2331, the second segment 2332, and the second part 232 form a U-shaped structure. The first portion 231 has a second surface 23a away from the bottom wall 31, and the second portion 232 has a first surface 23b away from the first portion 231 along a first direction X. The first portion 231 is parallel to the first wall 213, and at least a portion of the second portion 232 extends beyond the second surface 23a along the thickness direction Z of the first wall 213. A support member 241 is inserted into the gap. At least a portion of the first insulating member 242 is disposed between the first wall 213 and the first portion 231 of the electrode lead-out member 23. At least a portion of the second insulating member 243 is disposed between the second portion 232 and the first wall 213. The second insulating member 243, the support member 241, and the first insulating member 242 are integrally formed. The end of the second portion 232 away from the second segment 2332 abuts against the second insulating member 243. The first insulating member 242 is provided with a second through hole 2423 for cooperating with the electrode terminal 25. The electrode lead-out member 23 is provided with a first through hole 235 for cooperating with the electrode terminal 25. The first through hole 235 extends from the fifth surface 23c to the second surface 23a along the thickness direction Z of the first wall 213. The other end of the electrode terminal 25 passes through the second through hole 2423 and is inserted into the first through hole 235. The electrode terminal 25 is riveted to the electrode lead-out member 23. The first surface 23b is parallel to the thickness direction Z of the first wall 213 and is used for welding to the busbar component 30.

[0353] According to the embodiments of this application, the first surface 23b of the battery cell 20 is parallel to the thickness direction Z of the first wall 213, so as to facilitate the welding of the busbar component 30 and the electrode lead-out component 23, thereby improving the assembly efficiency of the battery 100 composed of the battery cell 20.

[0354] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer shell has a first wall; Electrode assembly, disposed within the housing; An electrode lead-out component is installed on the first wall for drawing out the electrical energy of the electrode assembly; The electrode lead-out component includes a first surface, the plane of which intersects with the first wall, and the first surface is used to connect with the busbar component; The electrode lead-out component includes a first part, a second part, and a third part. The first part is connected to the tab of the electrode assembly, the second part is used to connect to the busbar component, the first surface is the surface of the second part, and the third part connects the first part and the second part. The third part includes a first segment and a second segment, the first segment extending from the first part in a direction away from the first wall, the second segment connecting the first segment and the second part, and a gap being formed between the first segment and the second part; The second part extends from the second segment toward the first wall, and the first segment, the second segment, and the second part form a U-shaped structure; The battery cell also includes: A support member is inserted into the gap.

2. The battery cell according to claim 1, characterized in that, The electrode lead-out component further includes a second surface, the plane containing the second surface intersects with the first surface, the area of ​​the second surface is D1, the area of ​​the first surface is D2, and the condition 0.1≤D2 / D1≤10 is met.

3. The battery cell according to claim 2, characterized in that, 0.5≤D2 / D1≤2.

4. The battery cell according to claim 1, characterized in that, Along the thickness direction of the first wall, the dimension of the first surface is W1, which satisfies 1mm≤W1≤10mm.

5. The battery cell according to claim 1, characterized in that, The electrode lead-out component further includes a second surface, the plane of which intersects with the first surface, the electrode lead-out component is disposed on the side of the first wall away from the interior of the battery cell, and the second surface is the surface of the first portion away from the first wall.

6. The battery cell according to claim 5, characterized in that, The battery cell also includes: The electrode terminal has an electrode lead-out hole on the first wall. One end of the electrode terminal is connected to the first part, and the other end is electrically connected to the tab of the electrode assembly through the electrode lead-out hole.

7. The battery cell according to claim 5, characterized in that, Along the thickness direction of the first wall, at least a portion of the second portion extends beyond the first portion.

8. The battery cell according to claim 5, characterized in that, The first part and the second part are arranged along a first direction, the first surface is the surface of the second part that is opposite to the first part along the first direction, and the first direction is perpendicular to the thickness direction of the first wall.

9. The battery cell according to claim 5, characterized in that, The first portion is parallel to the first wall.

10. The battery cell according to claim 5, characterized in that, At least a portion of the second portion extends in a direction away from the first wall and beyond the second surface.

11. The battery cell according to claim 1, characterized in that, The two opposite sides of the support member are in contact with the first segment and the second part, respectively.

12. The battery cell according to claim 1, characterized in that, The support member is made of insulating material and extends beyond both ends of the third part along the second direction, which is perpendicular to the thickness direction of the first wall and parallel to the first surface.

13. The battery cell according to claim 1, characterized in that, The battery cell also includes: A first insulating element is disposed at least partially between the first wall and the first portion to insulate and isolate the first wall from the first portion.

14. The battery cell according to claim 13, characterized in that, The support member is connected to the first insulating member.

15. The battery cell according to claim 13, characterized in that, Along the second direction, the first insulating element extends beyond both ends of the first portion, and the second direction is perpendicular to the thickness direction of the first wall and parallel to the first surface.

16. The battery cell according to claim 13, characterized in that, The battery cell also includes: A second insulating element is at least partially disposed between the second portion and the first wall to insulate the second portion from the first wall.

17. The battery cell according to claim 16, characterized in that, The second insulating element is connected to the first insulating element.

18. The battery cell according to claim 16, characterized in that, The end of the second part away from the second segment abuts against the second insulating member.

19. The battery cell according to claim 16, characterized in that, Along a second direction, the second insulating element extends beyond both ends of the second portion, and the second direction is perpendicular to the thickness direction of the first wall and parallel to the first surface.

20. The battery cell according to claim 1, characterized in that, The thickness of the first part is greater than the thickness of the third part, and / or the thickness of the second part is greater than the thickness of the third part.

21. The battery cell according to claim 20, characterized in that, The first part, the third part, and the second part are arranged sequentially along the first direction. The dimension of the third part along the second direction is greater than the dimension of the first part along the second direction. The dimension of the third part along the second direction is greater than the dimension of the second part along the second direction. The first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other.

22. The battery cell according to claim 20, characterized in that, The cross-sectional area of ​​the first part is S1, the cross-sectional area of ​​the third part is S2, and the cross-sectional area of ​​the second part is S3. Among them, 0.2≤S1 / S2≤5, 0.2≤S2 / S3≤5, and 0.2≤S1 / S3≤5.

23. The battery cell according to claim 1, characterized in that, The thickness of the first part is H1, satisfying 0.2mm ≤ H1 ≤ 5mm; or The thickness of the third part is H2, satisfying 0.2mm ≤ H2 ≤ 2mm; or The thickness of the second part is H3, which satisfies 0.2mm≤H3≤5mm.

24. The battery cell according to claim 1, characterized in that, The battery cell also includes: The electrode terminal has an electrode lead-out hole in the first wall, and the electrode terminal passes through the electrode lead-out hole. One end of the electrode terminal is connected to the electrode lead-out member, and the other end is electrically connected to the tab of the electrode assembly.

25. The battery cell according to claim 24, characterized in that, The number of electrode terminals and the number of electrode lead-out holes are both multiple, and each electrode terminal corresponds to one electrode lead-out hole. Each electrode lead-out member is provided with a first groove, which is located between two adjacent electrode terminals.

26. The battery cell according to claim 25, characterized in that, The first groove extends to the edge of the electrode lead-out.

27. The battery cell according to claim 25, characterized in that, The battery cell also includes: A first insulating element is at least partially disposed between the first wall and the electrode lead-out to insulate and isolate the first wall from the electrode lead-out. The first insulating element includes a first protrusion inserted into the first groove.

28. The battery cell according to claim 27, characterized in that, The first wall includes a third surface facing away from the interior of the battery cell, the third surface having a second protrusion, and the first insulating member including a second groove, the second protrusion being inserted into the second groove.

29. The battery cell according to claim 1, characterized in that, The electrode lead extends beyond the edge of the first wall, and the first surface is located on the portion of the electrode lead that extends beyond the first wall.

30. The battery cell according to claim 29, characterized in that, The electrode lead-out includes a first part and a second part. The first part is electrically connected to the tab of the electrode assembly. The second part is used to connect to the busbar component. The second part extends beyond the edge of the first wall and protrudes from the first part along the thickness direction of the first wall. The first surface is the surface of the second part that faces away from the first part.

31. The battery cell according to claim 1, characterized in that, The plane containing the first surface is perpendicular to the first wall.

32. The battery cell according to claim 1, characterized in that, The outer shell includes a first wall and a second wall arranged opposite each other along the thickness direction of the first wall, a third wall and a fourth wall arranged opposite each other along a first direction, and a fifth wall and a sixth wall arranged opposite each other along a second direction. The areas of the third wall and the fourth wall are both smaller than the area of ​​the first wall, the area of ​​the third wall and the fourth wall are both smaller than the area of ​​the second wall, the area of ​​the fifth wall and the sixth wall are both smaller than the area of ​​the first wall, and the thickness direction of the first wall, the first direction and the second direction are perpendicular to each other.

33. The battery cell according to any one of claims 1-32, characterized in that, The housing includes a shell and an end cap, the shell having an opening, the end cap closing the opening, and the first wall being the end cap.

34. A battery, characterized in that, include: Box; The busbar assembly is housed within the enclosure; A plurality of battery cells as described in any one of claims 1-33 are housed in the housing, the plurality of battery cells are stacked along the thickness direction of the first wall, and the electrode leads of the plurality of battery cells are electrically connected through the busbar component.

35. The battery according to claim 34, characterized in that, In the thickness direction of the first wall, the projection of the end of the confluence component at least partially overlaps with the first wall.

36. The battery according to claim 34, characterized in that, The electrode lead-out is welded to the busbar component to form a solder area. Along the thickness direction of the first wall, the size of the first surface is W1, and the size of the solder area is W2, satisfying 0.01≤W2 / W1≤0.

5.

37. The battery according to claim 36, characterized in that, Along the second direction, the size of the first surface is F1, and the size of the solder area is F2, satisfying 0.01≤F2 / F1≤0.

5. The second direction is perpendicular to the thickness direction of the first wall and parallel to the first surface.

38. The battery according to claim 36, characterized in that, The area of ​​the first surface is M1, and the area of ​​the solder area is M2, satisfying 0.01≤M1 / M2≤0.

5.

39. The battery according to any one of claims 34-38, characterized in that, The current-collecting component includes a bottom wall, two side walls, and two flanges. The two side walls are arranged opposite each other along the thickness direction of the first wall. The bottom wall connects the two side walls. Each flange extends from the end of the corresponding side wall away from the bottom wall in a direction away from the other side wall. The two flanges are respectively connected to the electrode leads of the two battery cells.

40. The battery according to claim 34, characterized in that, The housing also has a second wall disposed opposite to the first wall, and a first region of the edge of the second wall is recessed to form a recess for accommodating at least a portion of the electrode leads of the battery cell adjacent to the second wall.

41. The battery according to claim 40, characterized in that, The electrode lead extends beyond the edge of the first wall, the first surface is located on the portion of the electrode lead that extends beyond the first wall, and the busbar has a flat plate structure.

42. The battery according to claim 41, characterized in that, The electrode lead is at least partially accommodated in the recess of the battery cell adjacent to the first wall. The electrode lead includes a first part and a second part. The first part is electrically connected to the tab of the electrode assembly. The second part is used to connect the busbar component. The second part extends beyond the edge of the first wall and protrudes from the first part along the thickness direction of the first wall. The first surface is the surface of the second part facing away from the first part. Along the direction from the first wall toward the electrode lead, the second portion extends beyond the recess of the battery cell adjacent to the first wall; and / or The housing includes a shell and an end cap. The shell has an opening, and the end cap closes the opening. The first wall is the end cap. In a direction perpendicular to the first surface, the projection of the second portion overlaps with the projection of the shell.

43. The battery according to claim 42, characterized in that, The battery further includes an insulating layer disposed on the surface of the electrode lead facing the housing, the insulating layer being used to insulate and isolate the electrode lead from the housing.

44. The battery according to claim 42, characterized in that, Along the thickness direction of the first wall, two adjacent electrode leads of two adjacent battery cells have two opposite ends, and the two ends of the busbar are respectively flush with the two ends; and / or, Along the second direction, the opposite ends of the busbar component are flush with the opposite ends of the electrode lead-out component, and the second direction, the thickness direction of the first wall, and the thickness direction of the busbar component are perpendicular to each other.

45. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-33, the battery cell being used to provide electrical energy.

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