WO2023133849A1

WO2023133849A1 - Battery cell and manufacturing method and apparatus therefor, battery and power consuming device

Info

Publication number: WO2023133849A1
Application number: PCT/CN2022/072157
Authority: WO
Inventors: 邹洋; 李英; 迟庆魁; 金海族
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-01-14
Filing date: 2022-01-14
Publication date: 2023-07-20
Also published as: CN116982211A

Abstract

The present application relates to the technical field of batteries, and provides a battery cell and a manufacturing method and apparatus therefor, a battery and a power consuming device. The battery cell comprises a housing assembly, an electrode assembly and a current collecting member. The housing assembly comprises an electrode lead-out portion configured to input or output electric energy. The electrode assembly is accommodated in the housing assembly, and comprises a main body portion and a tab portion protruding from the main body portion. The current collecting member is configured to connect the electrode lead-out portion and the tab portion, so that the tab portion is electrically connected to the electrode lead-out portion. The tab portion comprises a plurality of sub-tab portions, the current collecting member is provided with a plurality of avoidance areas, and each avoidance area is configured to allow at least part of one sub-tab portion to pass through, so that the sub-tab portion can be connected to the side of the current collecting member facing away from the main body portion. By means of the battery cell having this structure, the stability of connection between the sub-tab portions and the current collecting member can be improved, and the consistency of the plurality of sub-tab portions connected to the current collecting member can be increased, so that risks of uneven flow guiding and falling of the sub-tab portions are reduced.

Description

Battery cell and its manufacturing method and manufacturing equipment, battery and electrical device

technical field

The present application relates to the field of battery technology, in particular, to a battery cell, a manufacturing method and equipment thereof, a battery and an electrical device.

Background technique

Lithium-ion batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide application range, and small self-discharge coefficient. An important part of. The battery cell of a lithium-ion battery is assembled into an electrode assembly (bare cell) by winding or laminating the positive pole piece, the negative pole piece and the diaphragm, and then put into the casing, and then injected with the electrolyte. However, with the continuous development of lithium-ion battery technology, higher requirements are placed on the quality and safety of lithium-ion batteries. However, the batteries in the prior art have relatively large potential safety hazards during later use, which is not conducive to the safety of consumers.

Contents of the invention

Embodiments of the present application provide a battery cell, a manufacturing method and manufacturing equipment thereof, a battery, and an electrical device, which can effectively reduce potential safety hazards of the battery during use.

In the first aspect, the embodiment of the present application provides a battery cell, including a casing assembly, an electrode assembly, and a current collecting member; the casing assembly includes an electrode lead-out portion for inputting or outputting electric energy; the electrode assembly is accommodated in the In the casing assembly, the electrode assembly includes a main body and a tab protruding from the main body; the current collecting member is accommodated in the casing assembly, and the current collecting member is used to connect the electrode lead-out portion and the tab portion, so that the tab portion is electrically connected to the electrode lead-out portion; wherein, the tab portion includes a plurality of sub-tab portions, and the current collecting member has a plurality of avoidance areas, each The avoidance area is used for allowing at least part of one sub-tab to pass through, so that the sub-tab can be connected to a side of the current collecting member away from the main body.

In the above technical solution, the electrode assembly is provided with a main body and a tab protruding from the main body, the tab includes a plurality of sub-tabs, and the current collecting member has a plurality of avoidance areas, by placing each sub-tab It is installed in an avoidance area, and the sub-tab is connected to the side of the current-collecting member away from the main body after passing through the current-collecting member. On the one hand, the battery cell adopting this structure is conducive to improving the The stability of the connection with the current-collecting member can reduce the risk of falling off between the sub-tab and the current-collecting member during later use, so as to ensure the reliability of the battery cell and help to improve the battery cell service life; on the other hand, it is convenient to connect the sub-tab parts with the current-collecting member during the manufacturing process, which is conducive to improving the consistency of connecting multiple sub-tab parts to the current-collecting member, so as to reduce the contact between the tab part and the current-collecting member. The phenomenon of uneven conduction between the current collecting components can alleviate the phenomenon of temperature rise of the battery cell due to excessive local overcurrent, so as to reduce the safety hazard of the battery cell in the later use process, which is conducive to ensuring consumption. The user is safe to use. In addition, the electrode assembly of the battery cell with this structure does not need to use a flat structure of all tabs, which can effectively alleviate the short circuit of the battery cell caused by the powder particles generated during the flattening of the tabs of the electrode assembly. , and it is beneficial to improve the problems of poor shaping and insufficient diversion area in the flattened tab.

In some embodiments, the current collecting member includes a first connection part and a plurality of second connection parts; the first connection part is used to connect to the electrode lead-out part; the plurality of second connection parts are arranged along the The current collecting member is arranged at intervals in the circumferential direction of the first connection part, the second connection part has at least one avoidance area, and the second connection part is used to connect with the sub-tab part.

In the above technical solution, the current collecting member is provided with a first connecting portion and a plurality of second connecting portions, by arranging a plurality of second connecting portions on the first connecting portion along the circumferential direction of the current collecting member, and each second The connection part has at least one avoidance area, so that on the one hand, it facilitates the connection between the first connection part and the electrode lead-out part of the casing assembly, and on the other hand, the current collecting member can be connected to the sub-pole in a different area of the lug part in the circumferential direction of the current collecting member. The lugs are connected to ensure the stability of the connection between the current collecting member and the lugs.

In some embodiments, the second connecting portion has a plurality of avoidance areas arranged at intervals along the radial direction of the current collecting member.

In the above technical solution, by setting a plurality of avoidance areas arranged at intervals along the radial direction of the current collecting member on the second connecting portion, the multiple sub-tab portions of the tab portion in different regions in the radial direction of the current collecting member It can be connected to the second connecting part after passing through the corresponding avoidance area, so that the connection area between the tab part of the electrode assembly and the current collecting member can be improved, and it is beneficial to ensure the conduction between the tab part and the current collecting member. flow area to reduce the risk of polarization at the lug of the electrode assembly due to insufficient flow conduction area.

In some embodiments, the second connection part includes a confluence section and a plurality of flow guide sections; the confluence section is connected to the first connection part, and the confluence section extends radially of the current collecting member The diversion section is connected to the confluence section, a plurality of confluence sections are arranged at intervals along the radial direction of the current collecting member, and the diversion section extends along the circumferential direction of the current collecting member; wherein, Along the radial direction of the current collecting member, the second connecting portion forms the avoidance area on both sides of the flow guiding section, and the sub-tab portion is connected to the flow guiding section away from the main body side.

In the above technical solution, the second connection part is provided with a confluence section and a plurality of flow guide sections, the confluence section extends along the radial direction of the current collecting member and is connected to the first connection part, The radial intervals are arranged, and the flow guide section extends along the circumferential direction of the current collecting member. The arc-shaped structure extending in the circumferential direction realizes the formation of avoidance areas on both sides of the guide section along the radial direction of the current collecting member for the sub-tab to pass through, and makes the avoidance areas extend along the circumferential direction of the current collecting member , so that the sub-tab part passes through the second connection part of the current collecting member, this structure is simple and easy to realize.

In some embodiments, any one of the flow guide sections in one of the second connecting parts is located on a different circumference from any one of the flow guide sections in the other second connecting part.

In the above technical solution, the flow guide section of each second connection part is arranged on different circumferences, so that the flow guide section of each second connection part can be connected with the tab part of the electrode assembly in the current collecting The sub-tabs located on different circumferences in the radial direction of the component are connected, so that the overall connection area between the current collecting member and the tab can be effectively increased, and the flow guide between the current collecting member and the tab can be further improved. area, in order to reduce the risk of polarization of the tab part of the electrode assembly due to insufficient conduction area.

In some embodiments, the current guiding section is welded to the sub-tab to form a welded portion, and the length of the welded portion in the circumferential direction of the current collecting member is greater than or equal to the corresponding sub-tab 5% of the circumference of the circle in which it is located.

In the above technical solution, the length of the welded part formed by welding the diversion segment and the sub-tab part in the circumferential direction of the current collecting member is set to be not less than 5% of the circumference of the corresponding sub-tab part, that is to say , the welding length between each sub-tab and the current-collecting member is not less than 5% of the circumference of the corresponding sub-tab, which is conducive to improving the welding stability between each sub-tab and the current-collecting member on the one hand, On the other hand, the diversion area between each sub-tab and the current collecting member can be effectively ensured, so as to reduce the risk of temperature rise inside the battery cell caused by excessive local overcurrent at the sub-tab.

In some embodiments, the sub-tab portion extends along the circumferential direction of the current collecting member, and in the circumferential direction of the current collecting member, the sub-tab portion is located at two confluences adjacent to it. Between sections; the sub-tab is provided with a plurality of notches, and the plurality of notches are arranged at intervals along the circumferential direction of the current collecting member. Along the circumferential direction of the current collecting member, the sub-tab A tab segment connected to the flow guide segment is formed between every two adjacent notches.

In the above technical solution, by opening a plurality of gaps arranged at intervals along the circumference of the current collecting member on the sub-tab portion, that is to say, the sub-tab portion is provided with a plurality of gaps at intervals in its extending direction, so as to A tab section is formed between every two adjacent notches for connecting to the side of the guide section away from the main body of the electrode assembly, so that this structure can facilitate the sub-pole passing through the avoidance area on the one hand. The ears are bent so that the sub-tabs can be connected to the flow guide section, and on the other hand, it can effectively alleviate the phenomenon of wrinkles when the sub-tabs are bent and connected to the flow guide section.

In some embodiments, the lengths of the plurality of flow guide segments gradually increase from the inside to the outside in the circumferential direction of the flow collecting member.

In the above technical solution, since the circumference of the plurality of sub-tab parts of the tab portion gradually increases from the inside to the outside along the radial direction of the current collecting member, by increasing the length of the multiple flow guide sections on the current collecting member from The arrangement from inside to outside is increased sequentially to ensure that each diversion section has sufficient length to connect with the corresponding sub-tab, thereby ensuring the connection area between each diversion section and the corresponding sub-tab , in order to achieve uniform conduction between the lug portion and the current collecting member.

In some embodiments, along the radial direction of the current collecting member, the width of the flow guiding section is greater than or equal to the length of the portion of the sub-tab connected to the flow guiding section.

In the above technical solution, by setting the width of the flow guide section in the radial direction of the current collecting member to be not less than the length of the sub-pole ear connected to the flow guide section, that is to say, in the radial direction of the current collecting member, the sub-pole The length of the lugs connected to the diversion section is within the width of the diversion section, which can effectively reduce the redundancy caused by the excessive length of the lugs, and can effectively reduce the redundant sub-lugs inserted into the Risks within the main body of the electrode assembly.

In some embodiments, the width of the confluence section in the circumferential direction of the current collecting member is greater than the width of the flow guiding section in the radial direction of the current collecting member.

In the above technical solution, by setting the width of the confluence section to be greater than the width of the diversion section, the diversion area of the confluence section can be effectively ensured when the diversion section passes through the confluence section, so as to relieve the flow caused by the excessive flow of the confluence section. The phenomenon of temperature rise occurs, which in turn helps to reduce the risk of using the battery cell.

In some embodiments, the first connecting portion is an annular structure extending along the circumferential direction of the current collecting member, and the width of the first connecting portion in the radial direction of the current collecting member is larger than that of the confluent section The width in the circumferential direction of the current collecting member.

In the above technical solution, by setting the width of the first connection part to be greater than the width of the confluence section, the diversion area of the first connection part can be effectively ensured when the confluence section is converging through the first connection part, so as to ease the flow of the first connection. Part of the phenomenon of temperature rise due to excessive overcurrent, which is conducive to reducing the risk of using the battery cell.

In some embodiments, the housing assembly has a wall portion, the wall portion is provided with an electrode extraction hole, the electrode extraction portion is installed in the electrode extraction hole, at least part of the electrode extraction portion protrudes from the The outer side of the wall portion; a plurality of second connecting portions are distributed on the outer peripheral side of the first connecting portion along the circumferential direction of the current collecting member, and the second connecting portion is connected to the first connecting portion.

In the above technical solution, an electrode lead-out hole for installing the electrode lead-out part is opened on the wall of the housing assembly, at least part of the electrode lead-out part protrudes outside the wall, so that electric energy can be input or output through the electrode lead-out part . Wherein, by connecting a plurality of second connecting parts to the outer peripheral side of the first connecting part at intervals along the circumferential direction of the current collecting member, the connection between the first connecting part and the electrode lead-out part is facilitated, and the structure is simple and easy to assemble.

In some embodiments, the housing assembly has a wall portion, and the wall portion is the electrode lead-out portion; a plurality of the second connection portions are distributed on the first connection portion along the circumferential direction of the current collecting member on the inner peripheral side, and the second connecting portion is connected to the first connecting portion.

In the above technical solution, the wall part of the shell assembly is used as the electrode lead-out part to realize the input or output of electric energy, by connecting a plurality of second connection parts to the inner peripheral side of the first connection part at intervals along the circumferential direction of the current collecting member , so as to facilitate the connection between the first connecting portion and the wall portion of the shell assembly, facilitate assembly, and help ensure the connection area between the first connecting portion and the wall portion of the shell assembly.

In some embodiments, the current collecting member further includes a fixing portion, a plurality of second connecting portions are distributed on the outer peripheral side of the fixing portion along the circumferential direction of the collecting member, and the second connecting portions connect on the fixing part and the first connecting part.

In the above technical solution, the current collecting member is further provided with a fixing part, and by arranging a plurality of second connecting parts at intervals along the circumferential direction of the current collecting member on the outer peripheral side of the fixing part, so that the fixing part is located at the inner periphery of the first connecting part side, and the fixing part is connected to the first connecting part through a plurality of second connecting parts, which is beneficial to improve the structural stability and reliability of the current collecting member.

In some embodiments, the housing assembly includes a housing and an end cover; the housing includes a bottom wall and a side wall, the side wall surrounds the bottom wall, and one end of the side wall is connected to the The other end of the side wall surrounds an opening opposite to the bottom wall, the end cover covers the opening, and the wall part is the bottom wall or the end cover.

In the above technical solution, the shell assembly is provided with a shell and an end cover, and one end of the shell forms an opening, and the end cover covers the opening so that the shell assembly can accommodate the electrode assembly. This structure is simple and easy to implement.

In some embodiments, the two ends of the main body in the direction of its extension are provided with the tabs; the housing assembly includes two of the electrode lead-out parts; the battery cell includes two of the A current collecting member, the two current collecting members are respectively located at both ends of the main body, and each of the current collecting members is used to connect one of the tabs and one of the electrode lead-out parts.

In the above technical solution, by arranging two current collecting members in the casing assembly, each current collecting member can be connected to one tab part and one electrode lead-out part, so as to ensure that the two tab parts of the electrode assembly are connected to each other. The connection stability and conduction uniformity between the electrode lead-out parts of the corresponding housing components.

In some embodiments, the main body has a central channel, the central channel extends along the extension direction of the main body, and the central channel runs through both ends of the main body; the battery cell also includes an insulating A supporting piece, the insulating supporting piece is inserted into the central channel, and the two ends of the insulating supporting piece are respectively connected to the two current collecting members.

In the above technical solution, an insulating support is inserted into the central channel of the main body of the electrode assembly, so that the two current collecting members can be connected to both ends of the insulating support, so that the current collecting member can be fixed by the insulating support on the one hand. The position relative to the main body of the electrode assembly facilitates the connection of the sub-tabs of the tabs to the corresponding current collecting members, and on the other hand can increase the stability of the current collecting members assembled in the shell assembly.

In some embodiments, along the extending direction of the main body, the distance between two current collecting members is greater than the length of the main body.

In the above technical solution, by setting the distance between the two current collecting members in the extension direction of the main body to be greater than the length of the main body, a gap between the current collecting member and the main body can be realized, which in turn facilitates the increase of electrolyte Infiltrate the space of the main body of the electrode assembly.

In some embodiments, a mounting portion protrudes from a side of the current collecting member facing the main body, and the insulating support is sheathed on the outside of the mounting portion.

In the above technical solution, by sheathing the insulating support on the outside of the installation part of the current collecting member, it is easy to realize the connection between the insulating support and the current collecting member, which facilitates installation and saves the assembly of battery cells time.

In some embodiments, a mounting portion protrudes from a side of the current collecting member facing the main body, and the mounting portion is sheathed on the outer side of the insulating support.

In the above technical solution, by sheathing the mounting part of the current collecting member on the outside of the insulating support, that is to say, the insulating support is inserted into the mounting part, the battery cell adopting this structure is beneficial to the battery cell without occupying the electrode assembly. The wall thickness of the insulating support can be increased under the premise of the space, that is, the wall thickness of the insulating support can be increased without losing the capacity of the battery cell, which is conducive to improving the structural strength of the insulating support and improving the insulating support. resistance to deformation.

In a second aspect, the embodiment of the present application further provides a battery, including a plurality of the above-mentioned battery cells.

In a third aspect, the embodiment of the present application further provides an electric device, including the above-mentioned battery.

In a fourth aspect, the embodiment of the present application also provides a method for manufacturing a battery cell, including:

providing a housing assembly including an electrode lead-out portion for inputting or outputting electrical energy;

An electrode assembly is provided, the electrode assembly includes a main body and a tab protruding from the main body;

Provide current-collecting components;

installing the electrode assembly within the housing assembly;

connecting the current collecting member to the tab portion;

connecting the electrode lead-out portion to the current collecting member;

Wherein, the tab part includes a plurality of sub-tab parts, and the current collecting member has a plurality of avoidance areas, and each of the avoidance areas is used to allow at least part of one sub-tab part to pass through, so that all The sub-tab portion can be connected to a side of the current collecting member away from the main body portion.

In the fifth aspect, the embodiment of the present application also provides a battery cell manufacturing equipment, including a first providing device, a second providing device, a third providing device, a first assembling device, a second assembling device and a third assembling device; The first providing device is used to provide a casing assembly, and the casing assembly includes an electrode lead-out part for inputting or outputting electric energy; the second providing device is used to provide an electrode assembly, and the electrode assembly includes a main body and a protrusion The ear portion of the main body; the third providing device is used to provide a current collecting member; the first assembly device is used to install the electrode assembly in the shell assembly; the second assembly device It is used to connect the current collecting member to the tab portion; the third assembly device is used to connect the electrode lead-out portion to the current collecting member; wherein, the tab portion includes a plurality of sub-tabs The current collecting member has a plurality of avoidance areas, each of which is used to allow at least part of one sub-tab to pass through, so that the sub-tab can be connected to the current collector A side of the member facing away from the main body.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings that are required in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

Figure 2 is an exploded view of the structure of the battery provided by some embodiments of the present application;

FIG. 3 is an exploded view of the structure of a battery cell provided by some embodiments of the present application;

Fig. 4 is a cross-sectional view of a battery cell provided by some embodiments of the present application;

Fig. 5 is a partial enlarged view of A of the battery cell shown in Fig. 4;

Fig. 6 is a schematic structural diagram of a current collecting member provided by some embodiments of the present application;

Fig. 7 is a bottom view of a current collecting member provided by some embodiments of the present application;

Fig. 8 is a schematic diagram of the connection between the current collecting member and the electrode assembly provided by some embodiments of the present application;

Fig. 9 is a partial enlarged view of the B of the battery cell shown in Fig. 4;

Fig. 10 is a schematic structural diagram of a current collecting member provided in some other embodiments of the present application;

Fig. 11 is a bottom view of a current collecting member provided by some other embodiments of the present application;

Figure 12 is a schematic diagram of the connection between the insulating support and the current collecting member provided by some embodiments of the present application;

Fig. 13 is a partial cross-sectional view of the connection between the insulating support and the current collecting member provided by some embodiments of the present application;

Fig. 14 is a partial cross-sectional view of the connection between the insulating support and the current collecting member provided by some other embodiments of the present application;

FIG. 15 is a schematic flowchart of a method for manufacturing a battery cell provided in some embodiments of the present application;

Fig. 16 is a schematic block diagram of a manufacturing device for a battery cell provided by some embodiments of the present application.

Icons: 1000-vehicle; 100-battery; 10-box; 11-first part; 12-second part; 20-battery unit; 21-shell assembly; 211-housing; 212-end cover; 213-electrode Terminal; 214-insulating plastic; 22-electrode assembly; 221-main body; 222-ear part; 2221-sub-ear part; 2331-convergence section; 2332-flow diversion section; 234-fixed part; 235-installation part; 24-insulation support; 200-controller; 300-motor; 2000-manufacturing equipment; 2200-second providing device; 2300-third providing device; 2400-first assembling device; 2500-second assembling device; 2600-third assembling device.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are the Claim some of the examples, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field of this application; the terms used in this application in the description of the application are only to describe specific implementations The purpose of the example is not intended to limit the present application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and the description of the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific sequence or primary-subordinate relationship.

Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection", "connection" and "attachment" should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

The term "and/or" in this application is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and A and B exist alone. There are three cases of B. In addition, the character "/" in this application generally indicates that the contextual objects are an "or" relationship.

In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are for illustrative purposes only, and should not constitute any limitation to the application .

"Plurality" in this application refers to two or more (including two).

In the present application, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application. The battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application. Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, and the like. A battery generally includes a case for enclosing one or more battery cells or a plurality of battery modules. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive pole piece, a negative pole piece and a separator. A battery cell works primarily by moving metal ions between the positive and negative pole pieces. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode collector without the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. Fluid, the positive electrode current collector not coated with the positive electrode active material layer is used as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode collector without the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. Fluid, the negative electrode current collector not coated with the negative electrode active material layer is used as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon. In order to ensure that a large current is passed without fusing, the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together.

The material of the isolation film may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene). In addition, the electrode assembly may be a wound structure or a laminated structure, which is not limited in the embodiment of the present application.

Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide application range, and small self-discharge coefficient. They are an important part of new energy development. The battery cell of the battery is assembled into an electrode assembly (bare cell) by winding or laminating the positive pole piece, the negative pole piece and the diaphragm, and then put into the casing, and then injected with the electrolyte. However, with the continuous development of battery technology, higher requirements are placed on the quality and safety of batteries. Therefore, the safety performance of the battery cell determines the safety of the battery during use.

The inventors found that for a general battery cell, the electrode assembly needs to be electrically connected to the casing and the electrode terminals mounted on the casing, so that the casing and the electrode terminals serve as the negative output pole and the positive output pole of the battery cell In order to facilitate the electrical connection between the tabs of the electrode assembly and the housing or electrode terminals, current collecting members are usually arranged in the housing, and the tabs are all tabs flattened, so as to realize the connection between the tabs and the terminals through the current collecting members. The casing or the electrode terminals are electrically connected, thereby realizing the electrical connection between the electrode assembly and the casing. However, on the one hand, the battery cells with this structure are prone to powder particles during the flattening process of the tabs, so that the powder particles will cause short circuits in the battery cells, and the tabs have problems such as poor shaping and insufficient conduction area. On the other hand, the welding stability between the tab and the current-collecting member is not high, and the consistency is poor, so it is very easy to cause the phenomenon of desoldering between the tab and the current-collecting member, and it is easy to cause the welding between the tab and the current-collecting member The phenomenon of uneven conduction between them will cause the internal temperature of the battery cell to rise, which will lead to a greater safety hazard in the later use of the battery cell, which is not conducive to the safety of consumers.

Based on the above considerations, in order to solve the problem that there is a large safety hazard in the later use of the battery cell, which is not conducive to the safety of consumers, the inventor has conducted in-depth research and designed a battery cell. The battery cell includes A case assembly, an electrode assembly, and a current collecting member. The housing assembly has electrode leads for inputting or outputting electrical energy. The electrode assembly is arranged in the shell assembly, and the electrode assembly includes a main body and a tab protruding from the main body. The current collecting member is arranged in the shell assembly, and the current collecting member is connected to the electrode lead-out portion and the tab portion, so that the tab portion can be electrically connected to the electrode lead-out portion. Wherein, the tab part includes a plurality of sub-tab parts, the current collecting member has a plurality of avoidance areas, and each avoidance area can allow at least part of a sub-tab part to pass through, and the sub-tab parts are connected after passing through the avoidance area. On the side of the current collecting member away from the main body of the electrode assembly.

In the above-mentioned battery cell, the sub-tab part of the tab part of the electrode assembly is passed through the avoidance area of the current collecting member, and the sub-tab part is connected to the current collecting member after passing through the current collecting member On the side away from the main body, the battery cell adopting this structure is beneficial to improve the connection stability between the sub-pole ear and the current-collecting member, so that the connection between the sub-pole ear and the current-collecting member can be reduced during later use. The risk of falling off between the components ensures the reliability of the battery cells and helps to improve the service life of the battery cells; This is conducive to improving the consistency of the connection of multiple sub-tabs to the current-collecting member, so as to reduce the phenomenon of uneven conduction between the tabs and the current-collecting member, thereby alleviating the failure of the battery cell due to excessive local overcurrent. The phenomenon of temperature rise occurs to reduce the safety hazard of the battery cell in the later use process, which is conducive to ensuring the safety of consumers.

In addition, the electrode assembly of the battery cell with this structure does not need to use a flat structure of all tabs, which can effectively alleviate the short circuit of the battery cell caused by the powder particles generated during the flattening of the tabs of the electrode assembly. , and it is beneficial to improve the problems of poor shaping and insufficient diversion area in the flattened tab.

The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electric devices such as vehicles, ships or aircrafts. The power supply system comprising the battery unit and the battery disclosed in the present application to form the electric device can be used, so that the use safety of the battery can be effectively improved.

The embodiment of the present application provides an electric device using a battery as a power source. The electric device can be, but not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric boat toys, electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, spaceships, etc.

In the following embodiments, for the convenience of description, a vehicle 1000 as an electric device according to an embodiment of the present application is taken as an example for description.

Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle. The interior of the vehicle 1000 is provided with a battery 100 , and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000 . The battery 100 can be used for power supply of the vehicle 1000 , for example, the battery 100 can be used as an operating power source of the vehicle 1000 . The vehicle 1000 may further 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 starting, navigating and running the vehicle 1000 .

In some embodiments of the present application, the battery 100 can not only be used as an operating power source for the vehicle 1000 , but can also be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle 1000 .

Please refer to FIG. 2 , which is an exploded view of the structure of the battery 100 provided by some embodiments of the present application. The battery 100 includes a case body 10 and a battery cell 20 for being housed in the case body 10 . Wherein, the box body 10 is used to provide accommodating space for the battery cells 20 , and the box body 10 may adopt various structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, the first part 11 and the second part 12 jointly define a of accommodation space. The second part 12 can be a hollow structure with one end open, the first part 11 can be a plate-shaped structure, and the first part 11 covers the opening side of the second part 12, so that the first part 11 and the second part 12 jointly define an accommodation space The first part 11 and the second part 12 can also be hollow structures with one side opening, and the opening side of the first part 11 is covered by the opening side of the second part 12 . Of course, the box body 10 formed by the first part 11 and the second part 12 can be in various shapes, such as a cylinder, a cuboid and the like.

In the battery 100 , there may be multiple battery cells 20 , and the multiple battery cells 20 may be connected in series, in parallel or in parallel. The mixed connection means that the multiple battery cells 20 are connected in series and in parallel. A plurality of battery cells 20 can be directly connected in series, in parallel or mixed together, and then the whole composed of a plurality of battery cells 20 is housed in the box 10; of course, the battery 100 can also be a plurality of battery cells 20 The battery modules are firstly connected in series or parallel or in combination, and then multiple battery modules are connected in series or in parallel or in combination to form a whole, which is accommodated in the case 10 . The battery 100 may also include other structures, for example, the battery 100 may also include a bus component for realizing electrical connection between multiple battery cells 20 .

Wherein, each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but not limited thereto. The battery cell 20 may be in the form of a cylinder, a flat body, a cuboid or other shapes. Exemplarily, in FIG. 2 , the battery cell 20 is cylindrical.

According to some embodiments of the present application, please refer to FIG. 3 , FIG. 4 and FIG. 5 , FIG. 3 is an exploded view of the structure of the battery cell 20 provided by some embodiments of the present application, and FIG. 4 is a battery cell provided by some embodiments of the present application. 5 is a partial enlarged view of A of the battery cell 20 shown in FIG. 4 . The present application provides a case assembly 21 of a battery cell 20 , an electrode assembly 22 and a current collecting member 23 . The housing assembly 21 includes an electrode lead-out portion for inputting or outputting electric energy. The electrode assembly 22 is accommodated in the housing assembly 21 , and the electrode assembly 22 includes a main body 221 and a tab 222 protruding from the main body 221 . The current collecting member 23 is accommodated in the housing assembly 21 , and the current collecting member 23 is used to connect the electrode lead-out portion and the tab portion 222 so that the tab portion 222 is electrically connected to the electrode lead-out portion. Wherein, the tab part 222 includes a plurality of sub-tab parts 2221, and the current collecting member 23 has a plurality of avoidance areas 231, and each avoidance area 231 is used for at least part of a sub-tab part 2221 to pass through, so that the sub-tab The part 2221 can be connected to the side of the current collecting member 23 away from the main part 221 .

Wherein, each avoidance area 231 is used to allow at least part of a sub-tab 2221 to pass through, so that the sub-tab 2221 can be connected to the side of the current collecting member 23 away from the main body 221, that is, the sub-tab 2221 After passing through the current collecting member 23 through the avoidance area 231, it is connected to the side of the current collecting member 23 away from the main body 221. The sub-tab portion 2221 and the current collecting member 23 can be welded to each other, or can be in contact with each other, so that the electrodes The assembly 22 forms an electrical connection with the current collecting member 23 , so as to realize current conduction between the electrode assembly 22 and the current collecting member 23 .

Exemplarily, the sub-tab part 2221 is welded to the side of the current collecting member 23 away from the main part 221 .

It should be noted that one end of the electrode assembly 22 is formed with a multi-segment tab extending along the circumference of the current collecting member 23, the tab is the part of the current collector of the pole piece that is not coated with an active material layer, and the multi-segment tab extends along the current collecting member 23. 23 are arranged in sequence in the radial direction. In this embodiment, the sub-tab part 2221 includes at least one section of tab, that is, the sub-tab part 2221 can be one section of tab, or multiple sections of tabs arranged in layers, that is to say, through each avoidance area 231 The passed tab can be one section or multiple sections, and the tab is bent after passing through the avoidance area 231 , so that the tab can be welded to the side of the current collecting member 23 away from the main body 221 .

Wherein, the shell assembly 21 can also be used to accommodate electrolyte, such as electrolyte solution. The housing assembly 21 can be in various structural forms. The material of the shell component 21 can also be various, for example, copper, iron, aluminum, steel, aluminum alloy and so on.

In some embodiments, the housing assembly 21 may include a housing 211 and an end cover 212, the housing 211 is a hollow structure with one side open, the end cover 212 covers the opening of the housing 211 and forms a sealed connection to form a In the sealed space for containing the electrode assembly 22 and the electrolyte. When assembling the battery cell 20 , the electrode assembly 22 can be put into the casing 211 first, and electrolyte is filled into the casing 211 , and then the end cap 212 is closed on the opening of the casing 211 .

The housing 211 can be in various shapes, such as a cylinder, a cuboid, and the like. The shape of the casing 211 may be determined according to the specific shape of the electrode assembly 22 . For example, if the electrode assembly 22 has a cylindrical structure, the cylindrical casing 211 can be selected; if the electrode assembly 22 has a rectangular parallelepiped structure, the rectangular parallelepiped casing 211 can be selected. Of course, the end cap 212 can also be of various structures, for example, the end cap 212 is a plate-shaped structure, a hollow structure with one end open, and the like. Exemplarily, in FIG. 3 , the electrode assembly 22 is a cylindrical structure, and the casing 211 is a cylindrical casing 211 .

It can be understood that the shell assembly 21 is not limited to the above-mentioned structure, and the shell assembly 21 can also have other structures. For example, the shell assembly 21 includes a shell 211 and two end covers 212, and the shell 211 is open on opposite sides. Hollow structure, one end cap 212 correspondingly covers an opening of the casing 211 and forms a sealed connection, so as to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

In this embodiment, the electrode assembly 22 has a positive pole and a negative pole for inputting or outputting electric energy, so as to realize the power supply function of the battery cell 20 . The current collecting member 23 is a part used to connect the tab of the electrode assembly 22 and the electrode lead-out part, so as to realize the electrical connection between the tab and the electrode lead-out part.

The battery cell 20 can have various structures. Exemplarily, in FIG. 3 , the battery cell 20 includes two current collecting members 23, and correspondingly, both ends of the main body 221 of the electrode assembly 22 are provided with tabs. 222 (that is, both ends of the main body 221 have a plurality of tabs, and the tabs at the two ends of the main body 221 are respectively the part of the positive electrode sheet of the electrode assembly 22 that is not coated with the positive active material layer and the negative electrode of the electrode assembly 22. The part of the sheet that is not coated with the negative electrode active material layer, that is to say, the tabs at both ends of the main body 221 are respectively connected to the positive electrode current collector of the positive electrode sheet and the negative electrode current collector of the negative electrode sheet, so that the tabs located at the main body 221 The tabs at both ends can respectively output the positive electric energy and the negative electric energy of the electrode assembly 22), and the shell assembly 21 includes two electrode lead-out parts (the two electrode lead-out parts are respectively used for inputting or outputting the positive electric energy and the negative electric energy of the battery cell 20, The electrode lead-out part can be the shell 211 or the end cover 212, and can also be an electrode terminal connected to the shell 211 or the end cover 212), and each current collecting member 23 is used to electrically connect a pole ear 222 and an electrode lead-out department. Of course, in other embodiments, the battery cell 20 may only include one current collecting member 23, and the current collecting member 23 may be connected to the tab of the positive electrode collector of the positive electrode sheet and used for inputting or outputting the battery cell 20. Between the electrode lead-out parts of the positive electric energy of the positive electrode to realize the electrical connection between the tabs of the positive electrode current collector of the positive electrode sheet and the electrode lead-out parts for inputting or outputting the positive electric energy of the battery cell 20, it can also be connected to the negative electrode Between the lug of the negative electrode current collector of the pole piece and the electrode lead-out part for inputting or outputting the negative electrode electric energy of the battery cell 20, in order to realize the tab of the negative electrode current collector of the negative pole piece and the pole lug for inputting or outputting the battery cell The electrical connection between the electrode lead-out parts of the negative electric energy of 20.

The electrode assembly 22 is a part where electrochemical reactions occur in the battery cell 20 . The electrode assembly 22 may include a positive electrode tab, a negative electrode tab, and a separator. The electrode assembly 22 may be a coiled structure formed by winding a positive pole piece, a separator and a negative pole piece, or a laminated structure formed by stacking a positive pole piece, a separator and a negative pole piece. Exemplarily, in FIG. 3 , the electrode assembly 22 is a wound structure formed by winding a positive pole piece, a separator, and a negative pole piece.

In some embodiments, the battery cell 20 may further include a pressure relief mechanism installed on the end cover 212 . The pressure relief mechanism is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

Exemplarily, the pressure relief mechanism may be a component such as an explosion-proof valve, a burst disk, an air valve, a pressure relief valve, or a safety valve.

The electrode assembly 22 is provided with a main body part 221 and a tab part 222 protruding from the main part 221. The tab part 222 includes a plurality of sub-tab parts 2221, and the current collecting member 23 has a plurality of escape areas 231. The ear part 2221 is pierced in an avoidance area 231, and after passing through the current collecting member 23, the sub-pole ear part 2221 is connected to the side of the current collecting member 23 away from the main part 221. The battery cell 20 with this structure On the one hand, it is beneficial to improve the connection stability between the sub-tab 2221 and the current-collecting member 23, so that the risk of falling off between the sub-tab 2221 and the current-collecting member 23 can be reduced during later use, so as to ensure the stability of the battery cell. The reliability of the body 20 is improved, and it is beneficial to improve the service life of the battery cell 20; on the other hand, it is convenient to connect the sub-pole ear portion 2221 with the current collecting member 23 during the manufacturing process, which is conducive to improving the battery life of multiple sub-poles. The ear part 2221 is connected to the consistency of the current collecting member 23 to reduce the phenomenon of uneven conduction between the tab part 222 and the current collecting member 23, thereby reducing the temperature of the battery cell 20 due to excessive local overcurrent. In order to reduce the safety hazard of the battery cell 20 in the later use process, it is beneficial to ensure the safety of consumers. In addition, the electrode assembly 22 of the battery cell 20 adopting this structure does not need to adopt the structure of flattening all tabs, so that it can effectively relieve the battery cell 20 caused by the powder particles generated during the flattening process of the tabs of the electrode assembly 22 . There is a phenomenon of short circuit, and it is beneficial to improve the problems of poor shaping and insufficient diversion area of the tabs after kneading.

According to some embodiments of the present application, refer to FIG. 5, and please refer further to FIG. 6, FIG. 7 and FIG. The bottom view of the current collecting member 23 provided in some embodiments, FIG. 8 is a schematic diagram of the connection between the current collecting member 23 and the electrode assembly 22 provided in some embodiments of the present application. The current collecting member 23 includes a first connection part 232 and a plurality of second connection parts 233 . The first connection part 232 is used to connect to the electrode lead-out part. A plurality of second connecting portions 233 are arranged on the first connecting portion 232 at intervals along the circumferential direction of the current collecting member 23 , the second connecting portion 233 has at least one avoidance area 231 , and the second connecting portion 233 is used to connect with the sub-tab portion 2221 .

Wherein, a plurality of second connecting portions 233 are arranged at intervals on the first connecting portion 232 along the circumferential direction of the current collecting member 23 , that is, a plurality of second connecting portions 233 are arranged around the center of the collecting member 23 and arranged at intervals on the first connecting portion 232 . portion 232 , that is, the circumferential direction of the current collecting member 23 is the circumferential direction with the central position of the current collecting member 23 .

Exemplarily, the current collecting member 23 is provided with three second connecting portions 233 , and the three second connecting portions 233 are spaced along the circumferential direction of the current collecting member 23 and evenly arranged on the first connecting portion 232 . Certainly, in other embodiments, the number of the second connecting parts 233 may also be two, four, five or six, and so on.

The current collecting member 23 is provided with a first connecting portion 232 and a plurality of second connecting portions 233, by arranging a plurality of second connecting portions 233 on the first connecting portion 232 along the circumferential direction of the current collecting member 23, and each second The connection part 233 has at least one avoidance area 231, so that on the one hand, it facilitates the connection between the first connection part 232 and the electrode lead-out part of the housing assembly 21, and on the other hand, it enables the current collecting member 23 to be connected to the tab part 222 at the center of the current collecting member 23. The sub-tab portions 2221 in different regions in the circumferential direction are connected to ensure the connection stability between the current collecting member 23 and the tab portion 222 .

According to some embodiments of the present application, please refer to FIG. 6 , FIG. 7 and FIG. 8 , the second connecting portion 233 has a plurality of avoidance areas 231 arranged at intervals along the radial direction of the current collecting member 23 .

Wherein, a plurality of avoidance areas 231 are arranged at intervals along the radial direction of the current collecting member 23, that is, the arrangement direction of the plurality of avoidance areas 231 passes through the central position of the current collecting member 23, that is to say, the radial direction of the current collecting member 23 It is a direction from the center of the current collecting member 23 to the edge of the current collecting member 23 or a direction from the edge of the current collecting member 23 to the center of the current collecting member 23 .

By setting a plurality of avoidance areas 231 arranged at intervals along the radial direction of the current collecting member 23 on the second connecting portion 233, the plurality of sub-ear portions 2221 of the tab portion 222 in different regions in the radial direction of the current collecting member 23 It can be connected to the second connecting part 233 after passing through the corresponding avoidance area 231, so that the connection area between the tab part 222 of the electrode assembly 22 and the current collecting member 23 can be increased, and it is beneficial to ensure that the tab part 222 and the current collecting member 23 The flow guide area between the flow members 23 is reduced to reduce the risk of polarization of the tab portion 222 of the electrode assembly 22 due to insufficient flow guide area.

According to some embodiments of the present application, please refer to FIG. 6 and FIG. 7 , the second connecting portion 233 includes a flow converging section 2331 and a plurality of flow guiding sections 2332 . The confluence section 2331 is connected to the first connecting portion 232 , and the confluence section 2331 extends along the radial direction of the current collecting member 23 . The diversion section 2332 is connected to the confluence section 2331 , a plurality of confluence sections 2331 are arranged at intervals along the radial direction of the current collecting member 23 , and the diversion section 2332 extends along the circumferential direction of the current collecting member 23 . Wherein, along the radial direction of the current collecting member 23 , the second connecting portion 233 forms avoidance areas 231 on both sides of the flow guiding section 2332 , and the sub-tab portion 2221 is connected to the side of the flow guiding section 2332 away from the main body 221 .

Wherein, the diversion area 231 is formed on both sides of the flow guide section 2332 in the radial direction of the current collecting member 23, that is, the gaps of the flow guide section 2332 on both sides of the radial direction of the current collecting member 23 can be used for the pole ear portion 222. The sub-tab portion 2221 is pierced, so that the sub-tab portion 2221 can be welded to the corresponding flow guide section 2332 after passing through the escape area 231 .

Exemplarily, each second connecting portion 233 is provided with five flow guiding sections 2332 . In other embodiments, the number of flow guide segments 2332 may also be two, three, four or six, and so on.

It should be noted that, after passing through the avoidance area 231, the sub-tab portion 2221 can be bent along the radial direction of the current collecting member 23 toward the direction close to the center of the current collecting member 23 and then welded to the flow guiding section 2332, or can be welded to the flow guiding section 2332 along the radial direction of the current collecting member 23. The radial direction of the current collecting member 23 is bent in a direction away from the center of the current collecting member 23 and then welded to the flow guiding section 2332 .

The second connection part 233 is provided with a confluence segment 2331 and a plurality of flow guide segments 2332. The confluence segment 2331 extends in the radial direction of the current collecting member 23 and is connected to the first connection part 232. The members 23 are arranged at intervals in the radial direction, and the guide sections 2332 extend along the circumferential direction of the current collecting member 23, that is to say, a plurality of guide sections 2332 are connected to the confluence section 2331 at intervals along the extension direction of the confluence section 2331, and the guide sections 2332 The flow section 2332 is an arc-shaped structure extending along the circumferential direction of the current collecting member 23 , so that avoidance areas 231 for the sub-tabs 2221 to pass through are formed on both sides of the flow guiding section 2332 along the radial direction of the current collecting member 23 , and make the avoidance area 231 extend along the circumference of the current collecting member 23, so that the sub-tab portion 2221 passes through the second connecting portion 233 of the current collecting member 23. This structure is simple and easy to implement.

According to some embodiments of the present application, please refer to FIG. 7 and FIG. on the circumference.

Wherein, any one of the flow guide sections 2332 in one second connecting portion 233 is located on different circumferences from any one of the flow guide sections 2332 in the other second connecting portion 233, that is, in the circumferential direction of the current collecting member 23, each guide section The flow guide sections 2332 are arranged in a dislocation with other flow guide sections 2332 , that is, when each flow guide section 2332 extends along the circumferential direction of the current collecting member 23 , there is no corresponding overlapping flow guide section 2332 .

By arranging the flow guide section 2332 of each second connection part 233 to be located on different circumferences, the flow guide section 2332 of each second connection part 233 can be connected to the tab part 222 of the electrode assembly 22 in the current collecting The sub-tab portions 2221 located on different circumferences in the radial direction of the component 23 are connected, so that the overall connection area between the current collecting member 23 and the tab portion 222 can be effectively increased, and the connection between the current collecting member 23 and the tab portion can be further improved. 222 to reduce the risk of polarization at the tab portion 222 of the electrode assembly 22 due to insufficient flow guide area.

According to some embodiments of the present application, the diversion section 2332 is welded to the sub-tab portion 2221 to form a welded portion, and the length of the welded portion in the circumferential direction of the current collecting member 23 is greater than or equal to the circumference of the corresponding sub-tab portion 2221 5% longer.

Wherein, the length of the welded part in the circumferential direction of the current collecting member 23 is greater than or equal to 5% of the circumference of the corresponding sub-tab 2221, that is, the welding mark formed by welding the current-guiding section 2332 and the sub-tab 2221 is The circumferential length of the current collecting member 23 is greater than or equal to 5% of the circumference of the circumference where the corresponding sub-tab 2221 is located, that is to say, the welding length of each sub-tab 2221 and the current collecting member 23 is not less than the corresponding 5% of the circumference where the sub-pole ear part 2221 is located.

The length of the welded portion formed by welding the diversion section 2332 and the sub-tab portion 2221 in the circumferential direction of the current collecting member 23 is not less than 5% of the circumference of the corresponding sub-tab portion 2221, which is beneficial on the one hand Improve the welding stability between each sub-tab 2221 and the current-collecting member 23, on the other hand, it can effectively ensure the diversion area between each sub-tab 2221 and the current-collecting member 23, so as to reduce the local deformation of the sub-tab 2221 There is a risk of temperature rise inside the battery cell 20 due to excessive overcurrent.

According to some embodiments of the present application, the sub-tab portion 2221 extends along the circumferential direction of the current collecting member 23 , and in the circumferential direction of the current collecting member 23 , the sub-tab portion 2221 is located between two adjacent converging sections 2331 . A plurality of notches are opened on the sub-tab portion 2221, and the plurality of notches are arranged at intervals along the circumferential direction of the current collecting member 23. Along the circumferential direction of the current collecting member 23, the sub-tab portion 2221 is between every two adjacent notches. A tab segment connected to the diversion segment 2332 is formed.

Wherein, in the circumferential direction of the current collecting member 23 , the sub-tab portion 2221 is located between the two adjacent converging sections 2331 , that is, the sub-tab portion 2221 composed of at least one section of the tab is located in the circumferential direction of the current collecting member 23 . It is located between the two converging sections 2331 , so that each sub-tab portion 2221 can pass through the corresponding avoidance area 231 .

Along the circumferential direction of the current collecting member 23, the sub-tab portion 2221 forms a tab segment connected to the flow guide section 2332 between every two adjacent gaps, that is, through a plurality of tabs opened on the sub-tab portion 2221 The notch divides the sub-tab portion 2221 into multiple parts, and each part is a tab segment, that is to say, the sub-tab portion 2221 located between two converging segments 2331 is along the circumferential direction of the current collecting member 23 The discontinuous structure, that is, at least one section of tabs constituting the sub-tab portion 2221 is a discontinuous structure along the circumferential direction of the current collecting member 23 between every two adjacent converging sections 2331 .

By opening a plurality of gaps arranged at intervals along the circumferential direction of the current collecting member 23 on the sub-tab portion 2221 , that is to say, the sub-tab portion 2221 is provided with a plurality of gaps at intervals in its extending direction, so that every adjacent A tab section is formed between the two gaps of the guide section 2332 on the side of the main body 221 away from the electrode assembly 22, so that this structure can facilitate the inspection of the sub-sections after passing through the avoidance area 231 on the one hand. The tab part 2221 is bent so that the sub-tab part 2221 can be connected to the flow guide section 2332, and on the other hand, it can effectively alleviate the wrinkles when the sub-tab part 2221 is bent and connected to the flow guide section 2332 The phenomenon.

According to some embodiments of the present application, as shown in FIG. 7 and FIG. 8 , the lengths of the plurality of flow guide segments 2332 in the circumferential direction of the current collecting member 23 gradually increase from the inside to the outside.

Wherein, the length of the plurality of flow guide sections 2332 in the circumferential direction of the current collecting member 23 increases gradually from the inside to the outside, that is, in the direction from the center position of the flow collecting member 23 to the edge of the flow collecting member 23, the flow guide sections 2332 The arc length increases sequentially.

Since the circumference of the plurality of sub-tab parts 2221 of the tab part 222 increases gradually along the radial direction of the current collecting member 23 from the inside to the outside, the length of the plurality of flow guide segments 2332 on the current collecting member 23 increases from the inside The outer setting is increased in order to ensure that each diversion segment 2332 has sufficient length to connect with the corresponding sub-tab 2221 , thereby ensuring that the distance between each diversion segment 2332 and the corresponding sub-tab 2221 is sufficient. The connecting area is to realize the uniform conduction between the lug portion 222 and the current collecting member 23 .

According to some embodiments of the present application, please continue to refer to FIG. 7 and FIG. 8 , along the radial direction of the current collecting member 23 , the width of the flow guide section 2332 is greater than or equal to the part where the sub-tab portion 2221 is connected to the flow guide section 2332 length.

Wherein, the width of the diversion section 2332 is greater than or equal to the length of the part where the sub-tab 2221 is connected to the diversion section 2332, that is, in the radial direction of the current collecting member 23, the sub-tab 2221 is connected to the diversion section 2332. The length is within the width range of the diversion section 2332 .

By setting the width of the diversion section 2332 in the radial direction of the current collecting member 23 to be not less than the length of the sub-tab part 2221 connected to the diversion section 2332, it is possible to effectively reduce the redundancy caused by the too long tab part 2221 phenomenon, and can effectively reduce the risk of the redundant sub-tab portion 2221 being inserted into the main body portion 221 of the electrode assembly 22 .

According to some embodiments of the present application, please continue to refer to FIG. 7 and FIG. 8 , the width of the confluence section 2331 in the circumferential direction of the current collecting member 23 is greater than the width of the flow guiding section 2332 in the radial direction of the current collecting member 23 .

By setting the width of the confluence section 2331 to be greater than the width of the confluence section 2332, when the confluence section 2332 passes through the confluence section 2331, the diversion area of the confluence section 2331 can be effectively guaranteed to alleviate the excessive flow of the confluence section 2331. The phenomenon of temperature rise occurs, which is beneficial to reduce the use risk of the battery cell 20 .

According to some embodiments of the present application, please continue to refer to FIG. 7 and FIG. The width in the radial direction is greater than the width of the confluence section 2331 in the circumferential direction of the current collecting member 23 .

By setting the width of the first connecting portion 232 to be greater than the width of the converging section 2331, when the converging section 2331 passes through the first connecting portion 232, the diversion area of the first connecting portion 232 can be effectively ensured to relieve the pressure of the first connecting portion. The temperature rise of the 232 due to excessive overcurrent is beneficial to reduce the use risk of the battery cell 20 .

According to some embodiments of the present application, please refer to FIG. 4, FIG. 5 and FIG. Part protrudes from the outside of the wall. A plurality of second connecting portions 233 are distributed on the outer peripheral side of the first connecting portion 232 along the circumferential direction of the current collecting member 23 , and the second connecting portions 233 are connected to the first connecting portion 232 .

Wherein, the housing 211 includes a bottom wall and a side wall, the side wall is surrounded by the bottom wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall forms an opening opposite to the bottom wall, and the end cover 212 is closed. at the opening. The wall can be the bottom wall of the housing 211 or the end cover 212 .

Exemplarily, the wall part is the bottom wall of the end of the housing 211 away from the end cover 212, and the electrode lead-out part is the electrode terminal 213 installed on the end of the housing 211 away from the end cover 212, and protrudes from the outside of the housing 211 , the first connection part 232 is welded to the part of the electrode lead-out part inside the housing 211 to realize the input and output of electric energy. Of course, in other embodiments, the first connecting portion 232 may also abut against the bottom wall of the casing 211 , so that the casing 211 serves as an electrode lead-out portion to realize the input and output of electric energy.

In the battery cell 20 of this structure, the electrode lead-out part (electrode terminal 213) is insulated and installed on the casing 211, that is, the electrode lead-out part (electrode terminal 213) is connected to the casing 211, but the electrode lead-out part (electrode terminal 213) 213 ) is insulated from the housing 211 , that is, there is no electrical conduction between the electrode lead-out part (electrode terminal 213 ) and the housing 211 . Exemplarily, as shown in FIG. 3 , FIG. 4 and FIG. 5 , the electrode lead-out part (electrode terminal 213 ) is riveted to the end of the housing 211 away from the end cover 212 , and the housing assembly 21 may also include insulating plastic 214 , and the insulating plastic 214 is set Between the shell 211 and the electrode lead-out portion (electrode terminal 213 ), the electrode lead-out portion and the shell 211 are isolated, so that the electrode lead-out portion (electrode terminal 213 ) is insulated and installed on the shell 211 .

The wall of the housing assembly 21 is provided with an electrode lead-out hole for installing the electrode lead-out part. At least part of the electrode lead-out part protrudes outside the wall, so that electric energy can be input or output through the electrode lead-out part. Wherein, by connecting a plurality of second connecting parts 233 to the outer peripheral side of the first connecting part 232 at intervals along the circumferential direction of the current collecting member 23, the connection between the first connecting part 232 and the electrode lead-out part is facilitated, and the structure is simple and easy to assemble. .

According to some embodiments of the present application, referring to FIG. 9, FIG. 10 and FIG. 11, FIG. 9 is a partial enlarged view of the B of the battery cell 20 shown in FIG. Schematic diagram of the structure of the flow member 23 , FIG. 11 is a bottom view of the flow collection member 23 provided in some other embodiments of the present application. The case assembly 21 has a wall portion which is an electrode lead-out portion. A plurality of second connecting portions 233 are distributed on the inner peripheral side of the first connecting portion 232 along the circumferential direction of the current collecting member 23 , and the second connecting portions 233 are connected to the first connecting portion 232 .

Optionally, the wall part is an end cover 212, and the first connection part 232 of the current collecting member 23 is welded on the end cover 212 to realize input and output of electric energy. In other embodiments, the first connecting portion 232 may also abut against the end cover 212 . Of course, in other embodiments, the battery cell 20 may also have other structures, for example, the wall portion may also be the bottom wall of the end of the casing 211 away from the end cover 212 . It should be noted that the electrode lead-out part may also be an electrode terminal 213 installed on the casing 211 or the end cover 212, and the electrode terminal 213 is used for inputting or outputting electric energy.

The wall portion of the housing assembly 21 is used as an electrode lead-out portion to realize the input or output of electric energy, by connecting a plurality of second connecting portions 233 to the inner peripheral side of the first connecting portion 232 at intervals along the circumferential direction of the current collecting member 23, thereby It is convenient for the first connecting portion 232 to be connected to the wall of the housing assembly 21 , to facilitate assembly, and to ensure a connection area between the first connecting portion 232 and the wall of the housing assembly 21 .

According to some embodiments of the present application, please refer to FIG. 11 , the current collecting member 23 further includes a fixed portion 234, and a plurality of second connecting portions 233 are distributed on the outer peripheral side of the fixed portion 234 along the circumferential direction of the current collecting member 23. The second connecting portion 233 is connected to the fixing portion 234 and the first connecting portion 232 .

Wherein, the second connecting portion 233 is connected to the fixing portion 234 and the first connecting portion 232, that is, the two ends of the confluence section 2331 of the second connecting portion 233 in the radial direction of the current collecting member 23 are respectively connected to the fixing portion 234 and the first connecting portion. Section 232.

Exemplarily, the fixing portion 234 is an annular structure extending along the circumference of the current collecting member 23 .

By arranging a plurality of second connecting parts 233 at intervals along the circumferential direction of the current collecting member 23 on the outer peripheral side of the fixing part 234, the fixing part 234 is located on the inner peripheral side of the first connecting part 232, and the fixing part 234 is connected to the first connecting part 234. The parts 232 are connected by a plurality of second connecting parts 233 , so as to improve the structural stability and reliability of the current collecting member 23 .

According to some embodiments of the present application, please refer to FIG. 3 , the housing assembly 21 includes a housing 211 and an end cover 212 . The housing 211 includes a bottom wall and a side wall. The side wall is surrounded by the bottom wall. One end of the side wall is connected to the bottom wall. The other end of the side wall forms an opening opposite to the bottom wall. The end cover 212 covers the opening. , the wall is a bottom wall or an end cover 212 .

The housing assembly 21 is provided with a housing 211 and an end cover 212. One end of the housing 211 forms an opening, and the end cover 212 covers the opening so that the housing assembly 21 can accommodate the electrode assembly 22. This structure is simple and easy to implement.

According to some embodiments of the present application, please refer to FIG. 3 and FIG. 4 , both ends of the main body portion 221 in the extending direction are provided with tab portions 222 . The case assembly 21 includes two electrode extraction parts. The battery cell 20 includes two current collecting members 23 , the two current collecting members 23 are respectively located at two ends of the main body portion 221 , and each current collecting member 23 is used to connect a tab portion 222 and an electrode lead-out portion.

Exemplarily, the two electrode lead-out parts are respectively the end cover 212 and the electrode terminal 213 installed on the end of the casing 211 away from the end cover 212, between the electrode assembly 22 and the end cover 212 and between the electrode assembly 22 and the electrode terminal 213 A current collecting member 23 is disposed between them to realize the electrical connection between the electrode assembly 22 and the end cap 212 and the electrical connection between the electrode assembly 22 and the electrode terminal 213 .

By arranging two current collecting members 23 in the housing assembly 21, each current collecting member 23 can be connected to one tab portion 222 and one electrode lead-out portion, thereby ensuring that the two tab portions 222 of the electrode assembly 22 are connected to The connection stability and conduction uniformity between the electrode lead-out parts of the corresponding housing assembly 21 .

According to some embodiments of the present application, refer to FIG. 4 , and please further refer to FIG. 12 , which is a schematic diagram of connection between the insulating support 24 and the current collecting member 23 provided by some embodiments of the present application. The main body portion 221 has a central channel extending along the extension direction of the main body portion 221 , and the central channel runs through two ends of the main body portion 221 . The battery cell 20 further includes an insulating support 24 inserted into the central channel, and two ends of the insulating support 24 are respectively connected to the two current collecting members 23 .

Exemplarily, the material of the insulating support member 24 may be an insulating material such as plastic, plastic or rubber.

By inserting an insulating support in the central channel of the main body part 221 of the electrode assembly 22, the two current collecting members 23 can be connected to both ends of the insulating support 24, so that on the one hand, the insulating support can fix the current collecting member 23 relative to each other. The position of the main body part 221 of the electrode assembly 22 is so as to connect the sub-tab part 2221 of the tab part 222 to the corresponding current collecting member 23, on the other hand, it can increase the stability of the current collecting member 23 assembled in the shell assembly 21 sex.

According to some embodiments of the present application, along the extending direction of the main body 221 , the distance between the two current collecting members 23 is greater than the length of the main body 221 .

Wherein, along the extending direction of the main body 221 , the distance between the two current collecting members 23 is greater than the length of the main body 221 , that is, there is a gap between the current collecting members 23 and the main body 221 in the extending direction of the main body 221 .

By setting the distance between the two current collecting members 23 in the extension direction of the main body portion 221 to be greater than the length of the main body portion 221, a gap can be set between the current collecting member 23 and the main body portion 221, which is conducive to increasing electrolyte infiltration. The space of the main body part 221 of the electrode assembly 22 .

According to some embodiments of the present application, refer to FIG. 13 , which is a partial cross-sectional view of the insulating support 24 connected to the current collecting member 23 provided by some embodiments of the present application. In some embodiments, a mounting portion 235 protrudes from a side of the current collecting member 23 facing the main body portion 221 , and the insulating support 24 is sleeved on the outside of the mounting portion 235 .

Wherein, the insulating support 24 is a hollow structure with open ends, and the mounting portion 235 of the current collecting member 23 is inserted into the insulating supporting member 24 to realize the clamping connection between the insulating supporting member 24 and the current collecting member 23 . Certainly, in other embodiments, the insulating support 24 may also be connected to the insulating support 24 by means of bonding or the like.

Optionally, the installation part 235 may be connected to a side of the first connecting part 232 facing the main body part 221 , or may be connected to a side of the fixing part 234 facing the main body part 221 .

By sheathing the insulating support 24 on the outside of the mounting portion 235 of the current collecting member 23, the connection between the insulating supporting member 24 and the current collecting member 23 is facilitated, which facilitates installation and saves the assembly of the battery cells 20 time.

According to some embodiments of the present application, refer to FIG. 14 , which is a partial cross-sectional view of the connection between the insulating support 24 and the current collecting member 23 provided in some other embodiments of the present application. A mounting portion 235 protrudes from a side of the current collecting member 23 facing the main body portion 221 , and the mounting portion 235 is sleeved on the outer side of the insulating support 24 .

Wherein, the installation portion 235 is a hollow structure with one end open, and the insulating support 24 is inserted into the installation portion 235 to realize the clipping between the insulating support 24 and the current collecting member 23 .

Exemplarily, the insulating support 24 is also a hollow structure with both ends open. Of course, in some embodiments, the insulating support 24 may also be a solid columnar structure.

By sheathing the mounting portion 235 of the current collecting member 23 on the outside of the insulating support, that is to say, the insulating support 24 is inserted into the mounting portion 235, the battery cell 20 with this structure is beneficial to the battery cell 20 without occupying the electrode assembly. 22 under the premise of increasing the wall thickness of the insulating support 24, that is, the wall thickness of the insulating support 24 can be increased without losing the capacity of the battery cell 20, thereby helping to improve the structural strength of the insulating support 24, To improve the deformation resistance of the insulating support 24 .

According to some embodiments of the present application, the present application also provides a battery 100 comprising a plurality of battery cells 20 of any one of the above schemes.

According to some embodiments of the present application, the present application also provides an electric device, including the battery 100 according to any of the above schemes, and the battery 100 is used to provide electric energy for the electric device.

The electric device may be any of the aforementioned devices or systems using the battery 100 .

According to some embodiments of the present application, referring to FIGS. 3-11 , the present application provides a battery cell 20 , including a casing assembly 21 , an electrode assembly 22 , an insulating support 24 and two current collecting members 23 . The casing assembly 21 includes a casing 211, an end cover 212 and an electrode terminal 213. The casing 211 has a bottom wall and a side wall, the side wall is surrounded by the bottom wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall An opening opposite to the bottom wall is enclosed, the end cover 212 covers the opening, and the electrode terminal 213 is installed on the bottom wall of the casing 211 . The electrode assembly 22 includes a main body 221 and two tabs 222. The two tabs 222 protrude from both ends of the main body 221 in the extending direction. The tabs 222 include a plurality of sub-tabs 2221. The ear portion 2221 is composed of at least one pole ear. One current collecting member 23 of the two current collecting members 23 is used to electrically connect the end cap 212 and one tab portion 222, and the other current collecting member 23 is used to electrically connect the electrode terminal 213 to the other tab portion 222. The member 23 includes a first connection part 232 and a plurality of second connection parts 233, the first connection part 232 is connected to the end cap 212 or the electrode terminal 213, and the plurality of second connection parts 233 are arranged at intervals along the circumference of the current collecting member 23. The first connection part 232 and the second connection part 233 include a confluence section 2331 and a plurality of flow guide sections 2332, the confluence section 2331 is connected to the first connection part 232, and the confluence section 2331 extends radially along the current collecting member 23, and the flow guide The section 2332 is connected to the confluence section 2331, and a plurality of confluence sections 2331 are arranged at intervals along the radial direction of the current collecting member 23, and the flow guiding section 2332 extends along the circumferential direction of the current collecting member 23, and along the radial direction of the current collecting member 23, the second The connection part 233 forms avoidance areas 231 on both sides of the flow guide section 2332. The avoidance areas 231 are used for passing the sub-tab 2221 so that the sub-tab 2221 is connected to a side of the flow guide section 2332 away from the main body 221. side. Wherein, any one flow guiding section 2332 in one second connecting portion 233 is located on a different circumference from any one flow guiding section 2332 in another second connecting portion 233 . The insulating support 24 is inserted in the central channel, and the two ends of the insulating support 24 are respectively connected to the two current collecting members 23, so that the distance between the two current collecting members 23 in the extending direction of the main body portion 221 is greater than that of the main body portion 221 length.

The embodiment of the present application also provides a method for manufacturing a battery cell 20 , please refer to FIG. 15 . FIG. 15 is a schematic flowchart of a method for manufacturing a battery cell 20 provided in some embodiments of the present application. The manufacturing method includes:

S100: Provide a shell assembly 21, the shell assembly 21 includes an electrode lead-out part for inputting or outputting electric energy;

S200: provide an electrode assembly 22, the electrode assembly 22 includes a main body part 221 and a tab part 222 protruding from the main body part 221;

S300: providing a current collecting member 23;

S400: installing the electrode assembly 22 in the shell assembly 21;

S500: Connect the current collecting member 23 to the tab part 222;

S600: Connect the electrode lead-out part to the current collecting member 23;

Wherein, the tab part 222 includes a plurality of sub-tab parts 2221, and the current collecting member 23 has a plurality of avoidance areas 231, and each avoidance area 231 is used for at least part of a sub-tab part 2221 to pass through, so that the sub-tab The part 2221 can be connected to the side of the current collecting member 23 away from the main part 221 .

It should be noted that, for the relevant structure of the battery cell 20 manufactured by the manufacturing methods provided in the above embodiments, reference may be made to the battery cell 20 provided in the above embodiments, and details will not be repeated here.

The embodiment of the present application also provides a battery cell 20 manufacturing equipment 2000, please refer to FIG. 16. FIG. 16 is a schematic block diagram of the battery cell 20 manufacturing equipment 2000 provided by some embodiments of the present application. A providing device 2100 , a second providing device 2200 , a third providing device 2300 , a first assembling device 2400 , a second assembling device 2500 and a third assembling device 2600 .

The first providing device 2100 is used for providing the casing assembly 21, and the casing assembly 21 includes an electrode lead-out part for inputting or outputting electric energy. The second providing device 2200 is used for providing the electrode assembly 22 , and the electrode assembly 22 includes a main body 221 and a tab part 222 protruding from the main body 221 . The third providing device 2300 is used to provide the current collecting member 23 . The first assembly device 2400 is used for installing the electrode assembly 22 in the casing assembly 21 . The second assembly device 2500 is used to connect the current collecting member 23 to the lug portion 222 . The third assembly device 2600 is used to connect the electrode lead-out part to the current collecting member 23 .

It should be noted that, for the related structure of the battery cell 20 manufactured by the manufacturing equipment 2000 provided in the above embodiments, reference may be made to the battery cells 20 provided in the above embodiments, and details will not be repeated here.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

The above are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

A battery cell, comprising:

a casing assembly, the casing assembly including an electrode lead-out portion for inputting or outputting electrical energy;

an electrode assembly housed in the housing assembly, the electrode assembly including a main body and a tab protruding from the main body; and

a current collecting member, the current collecting member is accommodated in the housing assembly, and the current collecting member is used to connect the electrode lead-out portion and the tab portion so that the tab portion and the electrode lead-out portion electrical connection;

Wherein, the tab part includes a plurality of sub-tab parts, and the current collecting member has a plurality of avoidance areas, and each of the avoidance areas is used to allow at least part of one sub-tab part to pass through, so that all The sub-tab portion can be connected to a side of the current collecting member away from the main body portion.
The battery cell according to claim 1, wherein the current collecting member comprises:

a first connection part, the first connection part is used to connect to the electrode lead-out part;

A plurality of second connecting parts, the plurality of second connecting parts are arranged on the first connecting part at intervals along the circumference of the current collecting member, the second connecting part has at least one avoidance area, the The second connecting part is used for connecting with the sub-tab part.
The battery cell according to claim 2, wherein the second connecting portion has a plurality of avoidance areas arranged at intervals along the radial direction of the current collecting member.
The battery cell according to claim 3, wherein the second connecting portion comprises:

a confluence section, the confluence section is connected to the first connection part, and the confluence section extends radially of the current collecting member;

a plurality of diversion segments, the diversion segments are connected to the confluence segment, the plurality of diversion segments are arranged at intervals along the radial direction of the current collecting member, and the diversion segments are arranged along the circumference of the current collecting member to extend;

Wherein, along the radial direction of the current collecting member, the second connection part forms the avoidance area on both sides of the flow guide section, and the sub-tab part is connected to the flow guide section away from the side of the main body.
The battery cell according to claim 4, wherein any one of the flow guide sections in one of the second connecting parts is located on a different circumference from that of any one of the flow guide sections in the other second connecting part.
The battery cell according to claim 5, wherein the current guiding section is welded to the sub-tab to form a welded part, and the length of the welded part in the circumferential direction of the current collecting member is greater than or equal to the corresponding 5% of the circumference of the circumference of the sub-tab portion.
The battery cell according to any one of claims 4-6, wherein the sub-pole ear portion extends along the circumferential direction of the current collecting member, and in the circumferential direction of the current collecting member, the sub-pole The ear is located between the two confluent sections adjacent to it;

A plurality of notches are opened on the sub-tab, and the plurality of notches are arranged at intervals along the circumferential direction of the current collecting member, and along the circumferential direction of the current collecting member, each of the sub-tabs A tab segment connected to the flow guide segment is formed between the two gaps.
The battery cell according to any one of claims 4-7, wherein the lengths of the plurality of flow guide segments gradually increase from the inside to the outside in the circumferential direction of the current collecting member.
The battery cell according to any one of claims 4-8, wherein, along the radial direction of the current collecting member, the width of the flow guide section is greater than or equal to that of the sub-tab portion connected to the flow guide The length of the section of the segment.
The battery cell according to any one of claims 4-9, wherein the width of the confluence section in the circumferential direction of the current collecting member is greater than the width of the flow guiding section in the radial direction of the current collecting member .
The battery cell according to any one of claims 4-10, wherein the first connecting portion is a ring structure extending along the circumference of the current collecting member, and the first connecting portion The width of the flow member in the radial direction is greater than the width of the confluence section in the circumferential direction of the flow collecting member.
The battery cell according to any one of claims 2-11, wherein the housing assembly has a wall portion, the wall portion is provided with an electrode lead-out hole, and the electrode lead-out portion is installed in the electrode lead-out hole, so At least part of the electrode lead-out portion protrudes outside the wall;

A plurality of the second connecting portions are distributed on the outer peripheral side of the first connecting portion along the circumferential direction of the current collecting member, and the second connecting portions are connected to the first connecting portion.
The battery cell according to any one of claims 2-11, wherein the housing assembly has a wall portion, and the wall portion is the electrode lead-out portion;

A plurality of the second connecting portions are distributed on the inner peripheral side of the first connecting portion along the circumferential direction of the current collecting member, and the second connecting portions are connected to the first connecting portion.
The battery cell according to claim 13, wherein the current collecting member further includes a fixing portion, and a plurality of the second connecting portions are distributed on the outer peripheral side of the fixing portion along the circumferential direction of the current collecting member, The second connection part is connected to the fixing part and the first connection part.
A battery cell according to claim 12 or 13, wherein the housing assembly comprises a case and an end cap;

The housing includes a bottom wall and a side wall, the side wall surrounds the bottom wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall is connected to the bottom wall. The opening opposite to the bottom wall, the end cover covers the opening, and the wall part is the bottom wall or the end cover.
The battery cell according to any one of claims 1-15, wherein, both ends of the main body in its extending direction are provided with the tabs;

The housing assembly includes two electrode lead-out parts;

The battery cell includes two current-collecting members, the two current-collecting members are located at both ends of the main body, and each current-collecting member is used to connect one of the tabs and one of the tabs. The electrode lead-out part.
The battery cell according to claim 16, wherein the main body has a central channel, the central channel extends along the extending direction of the main body, and the central channel passes through both ends of the main body;

The battery cell further includes an insulating support inserted into the central channel, and two ends of the insulating support are respectively connected to the two current collecting members.
The battery cell according to claim 17, wherein, along an extending direction of the main body part, a distance between two of the current collecting members is greater than a length of the main body part.
The battery cell according to claim 17 or 18, wherein a mounting portion protrudes from a side of the current collecting member facing the main body, and the insulating support is sheathed on the outside of the mounting portion.
The battery cell according to claim 17 or 18, wherein a mounting portion protrudes from a side of the current collecting member facing the main body, and the mounting portion is sleeved on the outside of the insulating support.
A battery comprising a plurality of battery cells according to any one of claims 1-20.
An electrical device comprising the battery according to claim 21.
A method for manufacturing a battery cell, comprising:

providing a housing assembly including an electrode lead-out portion for inputting or outputting electrical energy;

An electrode assembly is provided, the electrode assembly includes a main body and a tab protruding from the main body;

Provide current-collecting components;

installing the electrode assembly within the housing assembly;

connecting the current collecting member to the tab portion;

connecting the electrode lead-out portion to the current collecting member;

Wherein, the tab part includes a plurality of sub-tab parts, and the current collecting member has a plurality of avoidance areas, and each of the avoidance areas is used to allow at least part of one sub-tab part to pass through, so that all The sub-tab portion can be connected to a side of the current collecting member away from the main body portion.
A battery cell manufacturing equipment, comprising:

a first providing device, the first providing device is used for providing a casing assembly, the casing assembly includes an electrode lead-out portion for inputting or outputting electric energy;

A second providing device, the second providing device is used to provide an electrode assembly, the electrode assembly includes a main body and a tab protruding from the main body;

third providing means for providing a current collecting member;

a first assembly device, the first assembly device is used to install the electrode assembly in the housing assembly;

a second assembly device for connecting the current collecting member to the lug portion; and

a third assembling device, the third assembling device is used to connect the electrode lead-out part to the current collecting member;

Wherein, the tab part includes a plurality of sub-tab parts, and the current collecting member has a plurality of avoidance areas, and each of the avoidance areas is used to allow at least part of one sub-tab part to pass through, so that all The sub-tab portion can be connected to a side of the current collecting member away from the main body portion.