WO2023178483A1

WO2023178483A1 - Battery cell, manufacturing method and manufacturing equipment therefor, battery, and power consuming apparatus

Info

Publication number: WO2023178483A1
Application number: PCT/CN2022/082062
Authority: WO
Inventors: 曹丹; 柴志生; 谷慧
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2023-09-28
Also published as: CN117157821A

Abstract

The present application provides a battery cell, a manufacturing method and manufacturing equipment therefor, a battery, and a power consuming apparatus, in the technical field of batteries. The battery cell comprises a housing, an end cover, an electrode assembly and a first current collecting component. The housing is provided with an opening. The end cover covers the opening. The electrode assembly is accommodated in the housing, and the electrode assembly comprises a first pole piece, the first pole piece being provided with a first current collecting section which is not coated with an active substance layer. The first current collecting component is located in the housing and is sleeved outside of the electrode assembly, and the first current collecting component is used to connect the end cover and the first current collecting section, such that the end cover is electrically connected to the first pole piece. A battery cell having this structure can decrease vibration of an electrode assembly inside a housing during usage, so that the risk of connection failure of a first current collecting section and an end cover caused by vibration of the electrode assembly is reduced, the service life of the battery cell is prolonged, and the risk of lithium precipitation or internal temperature rise caused by unstable electric connection of the battery cell may be reduced.

Description

Battery cells, manufacturing methods and manufacturing equipment, batteries and electrical devices

Technical field

The present application relates to the field of battery technology, specifically, to a battery cell and its manufacturing method and manufacturing equipment, batteries and electrical devices.

Background technique

Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and small self-discharge coefficient. They are an important part of the development of new energy today. The battery cell is composed of a positive electrode plate, a negative electrode plate and a separator film which are assembled into an electrode assembly (bare cell) by winding or laminating, and then put into the case, then covered with an end cap, and finally injected with electrolyte. obtained later. However, with the continuous development of battery technology, higher requirements have been put forward for the cycle life and safety of batteries. However, batteries in the prior art have a short cycle life, and there are major 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, a battery and a power device, which can effectively reduce potential safety hazards in the later use of the battery.

In a first aspect, embodiments of the present application provide a battery cell, including a casing, an end cover, an electrode assembly and a first current collecting member; the casing has an opening; the end cover is closed with the opening; The electrode assembly is accommodated in the housing, and the electrode assembly includes a first pole piece, the first pole piece has a first current collection section that is not coated with an active material layer; the first current collection member is located on the In the housing and sleeved on the outside of the electrode assembly, the first current collecting member is used to connect the end cover and the first current collecting section to realize the end cover and the first pole piece. Electrical connection.

In the above technical solution, the first current collecting member is placed on the outside of the electrode assembly, and the first current collecting section of the first pole piece is connected to the end cover through the first current collecting member, thereby realizing the electric energy input of the electrode assembly. Or output, the battery cell using this structure can effectively improve the structural stability of the battery cell to reduce the shaking of the electrode assembly in the case during later use, thereby helping to reduce the shaking of the electrode assembly. This causes the risk of connection failure between the first current collecting section of the first pole piece and the end cover. On the other hand, there is no need to realize the input or output of electric energy through a structure connecting the first current collecting section of the first pole piece to the casing. This can effectively alleviate the phenomenon of connection failure between the battery cell casing and the first current collection section when it expands or shrinks and deforms during later use, thereby reducing the risk of unstable or failed electrical connection of the battery cell, thereby having It is conducive to extending the service life of the battery cells, and can effectively reduce the risk of lithium precipitation or internal temperature rise in the battery cells due to unstable electrical connections, thereby reducing potential safety hazards in the later use of the battery cells.

In some embodiments, the first current collecting member includes a first connection part and a second connection part; along the thickness direction of the end cap, the first connection part is located between the end cap and the electrode assembly. The first connection part is connected to the end cover; the second connection part is surrounded by the first connection part, and the second connection part is sleeved on the outside of the electrode assembly and used Connected to the first collecting section.

In the above technical solution, the first current collecting member is provided as a first connection part and a second connection part connected to each other, and the second connection part is surrounded by the first connection part, so as to form the third part of the sleeve structure. The current collecting member adopts this structure. On the one hand, the first current collecting member can improve the assembly stability between the electrode assembly and the first current collecting member. On the other hand, through the structure connecting the first connecting part and the end cover, it can The connection area between the first current collecting component and the end cover is effectively increased, thereby helping to ensure the overcurrent stability of the first current collecting component and the end cover, thereby reducing the risk of local temperature rise due to insufficient overflow.

In some embodiments, the first current collection section forms at least part of the outer circumferential surface of the electrode assembly.

In the above technical solution, at least part of the outer peripheral surface of the electrode assembly is formed by the first current collection section of the first pole piece. That is to say, the first current collection section covers the outer peripheral side of the electrode assembly along the circumferential direction of the electrode assembly. , so that after the first current collecting section is connected to the second connecting portion of the first current collecting member, the electrical connection between the first pole piece and the first current collecting member can be realized. On the one hand, the battery cell adopting this structure does not need Processing the tabs at the end of the electrode assembly for electrical connection with the end cover can effectively reduce the production cost of the battery cells, and can effectively reduce the difficulty of connecting the electrode assembly and the end cover, which is beneficial to improving the battery cell quality. On the other hand, the electrolyte can directly infiltrate the electrode assembly through the end of the electrode assembly, which is beneficial to improving the infiltration effect of the electrode assembly.

In some embodiments, the first current collecting section is welded to the inner peripheral surface of the second connecting part; and/or the end cap is welded to the first connecting part.

In the above technical solution, the first current collecting section and the second connecting part and the end cover and the first connecting part are connected by welding, which is beneficial to improve the connection between the first current collecting section and the second connecting part and the end cover and the first connecting part. The reliability and stability of the connection between parts. In addition, by welding the inner peripheral surfaces of the first current collecting section and the second connecting section, it is beneficial to increase the connection area between the first current collecting section and the second connecting section, thereby ensuring that the first current collecting section and the second connecting part are connected to each other. The flow area between the two connecting parts.

In some embodiments, along the thickness direction of the end cover, the first current collecting section forms an end of the electrode assembly facing away from the end cover; the battery cell further includes a second current collecting member, The second current collecting member is located in the housing and sleeved on the outside of the electrode assembly. The second current collecting member is connected to the second connecting part and the first current collecting section.

In the above technical solution, the first current collecting member of the first pole piece is disposed on an end of the electrode assembly away from the end cover, and the second current collecting member is sleeved on the outside of the electrode assembly to pass the second current collecting member. The second connecting portion connecting the first current collecting section and the first current collecting structure can realize the electrical connection between the first pole piece and the end cover, has a simple structure and is easy to manufacture.

In some embodiments, the second current collecting member includes a third connection part and a fourth connection part; along the thickness direction of the end cover, the third connection part is located on the first current collecting section away from the On one side of the end cap, the third connecting part is connected to the first current collecting section; the fourth connecting part is surrounded by the third connecting part, and the fourth connecting part is sleeved on the The outer side of the electrode assembly is connected to the second connecting portion.

In the above technical solution, the second current collecting member is provided as a third connection part and a fourth connection part connected to each other, and the fourth connection part is surrounded by the third connection part, so as to form the third connection part of the sleeve structure. The second current collecting member adopting this structure can, on the one hand, improve the assembly stability and reliability between the electrode assembly and the second current collecting member, and on the other hand, by connecting the third connection part with the first electrode The structure in which the first current collecting section of the sheet is connected can effectively increase the connection area between the second current collecting component and the first current collecting section, thereby helping to ensure the overflow stability of the second current collecting component and the first current collecting section. , to reduce the risk of local temperature rise due to insufficient overcurrent.

In some embodiments, along the thickness direction of the end cap, parts of the second connection part and parts of the fourth connection part overlap each other and are welded to form an overlapping area.

In the above technical solution, by overlapping and welding the connecting parts of the second connecting part and the fourth connecting part, the connection stability and reliability of the first current collecting member and the second current collecting member can be effectively improved to reduce the risk of There is a risk of desoldering between the first current collecting component and the second current collecting component, and it is beneficial to increase the contact area between the first current collecting component and the second current collecting component to ensure overcurrent stability.

In some embodiments, the first current collecting section is welded to the third connection part; and/or the end cap is welded to the first connection part.

In the above technical solution, the first current collecting section and the third connecting part and the end cover and the first connecting part are connected by welding, which is beneficial to improve the connection between the first current collecting section and the third connecting part and the end cover and the first connecting part. connection stability and reliability between parts.

In some embodiments, the end cap is insulated with electrode terminals; the electrode assembly also includes a second pole piece, the second pole piece has a second current collection section that is not coated with an active material layer, along the In the thickness direction of the end cap, the second current collecting section forms one end of the electrode assembly close to the end cap, and the second current collecting section is used to be connected to the electrode terminal to realize the second pole. The piece is electrically connected to the electrode terminal.

In the above technical solution, the input or output of electric energy of the second pole piece is realized by arranging the second current collection section of the second pole piece at one end of the electrode assembly close to the end cover and connecting it to the electrode terminal on the end cover. The electrode assembly using this structure is conducive to ensuring that there is sufficient ventilation space in the center of the electrode assembly. On the one hand, it is convenient to add electrolyte into the case during later use, and on the other hand, it is convenient for the gas circulation inside the battery cell. , to alleviate the phenomenon that the internal air pressure of the battery cell is too high, thereby helping to improve the safety performance of the battery cell.

In some embodiments, the battery cell further includes an insulating member; the insulating member is disposed between the first current collecting member and the second current collecting section, and the insulating member is configured to insulate and isolate the The first current collecting component and the second current collecting section.

In the above technical solution, an insulating member is provided between the first current collecting member and the second current collecting section of the second pole piece to achieve insulation isolation between the first current collecting member and the second current collecting section, thereby It can effectively alleviate the short circuit phenomenon between the first pole piece and the second pole piece, thereby helping to reduce the risk of internal short circuit in the battery cell.

In some embodiments, the end cap, the first current collecting member and the first current collecting section are made of the same material.

In the above technical solution, by arranging the end cover, the first current collecting member and the first current collecting section to be made of the same material, the interconnection between the components of the same material is facilitated and the manufacturing cost of the battery cells is reduced. Difficulty.

In some embodiments, both the end cap and the first current collecting member are made of copper.

In the above technical solution, by setting the material of the end cover and the first current collecting member to copper, it is beneficial to reduce the resistivity of the end cover and the first current collecting member, thereby effectively reducing the internal resistance of the battery cell. To improve the performance of battery cells.

In a second aspect, embodiments of the present application further provide a battery, including a box and the above-mentioned battery cell; the battery cell is used to be accommodated in the box.

In a third aspect, embodiments of the present application further provide an electrical device, including the above-mentioned battery.

In a fourth aspect, embodiments of the present application also provide a method for manufacturing a battery cell, which includes: providing a case, the case having an opening; providing an end cover; and providing an electrode assembly, the electrode assembly including a first pole piece, The first pole piece has a first current collection section that is not coated with an active material layer;

Provide a first current collecting member; sleeve the first current collecting member on the outside of the electrode assembly, and connect the first current collecting member to the first current collecting section; connect the electrode assembly and The first current collecting member is accommodated in the housing; the end cover is closed on the opening, and the end cover is connected to the first current collecting member.

In a fifth aspect, embodiments of the present application further provide a battery cell manufacturing equipment, including a first providing device, a second providing device, a third providing device, a fourth providing device, a first assembling device, a second assembling device and The third assembly device; the first providing device is used to provide a housing, the housing has an opening; the second providing device is used to provide an end cover; the third providing device is used to provide an electrode assembly, the The electrode assembly includes a first pole piece, the first pole piece has a first current collecting section that is not coated with an active material layer; the fourth providing device is used to provide a first current collecting member; the first assembly device is The first current collecting member is placed on the outside of the electrode assembly, and the first current collecting member is connected to the first current collecting section; the second assembly device is used to assemble the electrode The assembly and the first current collecting member are accommodated in the housing; the third assembly device is used to cover the end cover with the opening, and connect the end cover with the first current collecting member connected.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used 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 therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

Figure 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 a battery provided by some embodiments of the present application;

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

Figure 4 is a cross-sectional view of a battery cell according to some embodiments of the present application;

Figure 5 is a partial enlarged view of position A of the battery cell shown in Figure 4;

Figure 6 is a cross-sectional view of the first current collecting component provided by some embodiments of the present application;

Figure 7 is a cross-sectional view of a battery cell provided by some further embodiments of the present application;

Figure 8 is a partial enlarged view of B of the battery cell shown in Figure 7;

Figure 9 is a schematic diagram of the connection between the first current collecting component and the second current collecting component of the battery cell according to some embodiments of the present application;

Figure 10 is a partial cross-sectional view of a battery cell provided by some embodiments of the present application;

Figure 11 is a schematic flow chart of a manufacturing method of a battery cell provided by some embodiments of the present application;

Figure 12 is a schematic block diagram of battery cell manufacturing equipment provided by some embodiments of the present application.

Icon: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-casing; 211-opening; 22-end cover; 221 -Electrode terminal; 2211-Injection hole; 222-Insulating plastic; 23-Electrode assembly; 231-First current collection section; 232-Second current collection section; 233-Central channel; 24-First current collection component; 241 -First connection part; 2411-through hole; 242-second connection part; 2421-avoidance groove; 243-first accommodation groove; 25-second current collecting member; 251-third connection part; 252-fourth connection 253-second receiving groove; 26-third current collecting member; 27-seal; 28-insulator; 281-first part; 282-second part; 200-controller; 300-motor.

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 Apply for some of the embodiments, not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the technical field of this application; the terms used in the specification of this application are only for describing specific implementations. The purpose of the examples is not intended to limit the application; the terms "including" and "having" and any variations thereof in the description and claims of the application and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or priority relationship.

Reference in this application to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances 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 stated and limited, the terms "installation", "connection", "connection" and "attachment" should be understood in a broad sense. For example, it can be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediate medium; it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The term "and/or" in this application is just an association relationship describing related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, alone There are three situations B. In addition, the character "/" in this application generally indicates that the related 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 simplicity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only illustrative illustrations and should not constitute any limitation to the present application. .

"Plural" appearing in this application means two or more (including two).

In this 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, etc., which are not limited in the embodiments of this application. The battery cell may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present application are not limited to this. Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application are not limited to this.

The battery mentioned in the embodiments of this 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. Batteries generally include a box for packaging one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

The battery cell includes a casing, an electrode assembly and an electrolyte. The casing is used to accommodate the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode piece, a negative electrode piece and an isolation film. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work. 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. The part of the positive electrode current collector that is not coated with the positive electrode active material layer serves as a positive electrode tab to realize the operation through the positive electrode tab. The electrical energy input or output of the positive pole piece. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc. 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. The part of the negative electrode current collector that is not coated with the negative electrode active material layer serves as a negative electrode tab to realize the realization of the negative electrode tab. The electrical energy input or output of the negative pole piece. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon. In order to ensure that large currents can pass through without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

The material of the isolation film can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. In addition, the electrode assembly may have a rolled structure or a laminated structure, and the embodiments of the present application are not limited thereto.

Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and small self-discharge coefficient. They are an important part of the development of new energy today. The battery cell is composed of a positive electrode plate, a negative electrode plate and a separator film which are assembled into an electrode assembly (bare cell) by winding or laminating, and then put into the case, then covered with an end cap, and finally injected with electrolyte. obtained later. However, with the continuous development of battery technology, higher requirements have been put forward for the cycle life and safety of batteries. Therefore, the safety performance of the battery cell determines the safety of the battery during use.

The inventor found that for a general battery cell, the positive electrode piece and the negative electrode piece of the electrode assembly need to be electrically connected to the case or end cover, so that the case or end cover serves as the positive output electrode or negative electrode of the battery cell. Output pole, therefore, the end of the electrode assembly is usually provided with a tab electrically connected to the housing or end cover. The tab is flattened and then welded to the housing or end cover to realize the connection between the electrode assembly and the housing or end cover. However, in this structure, the processing technology of the tabs is more complicated, and the welding between the tabs and the case or end cover is difficult, which leads to the production cost and production efficiency of the battery cells. Cannot be optimized. In the prior art, in order to reduce the difficulty of connection between the electrode assembly and the casing or end cover, the positive current collector of the positive electrode piece of the electrode assembly is first wound around the connecting tube of the end cover, and then the positive electrode piece, The separator and the negative electrode sheet are wound, and then the negative electrode current collector of the negative electrode sheet is wrapped on the outer peripheral side of the electrode assembly along the circumferential direction of the electrode assembly, and the negative electrode current collector is welded to the shell, so that the electrode assembly passes through The casing and end cover realize the positive and negative output poles of the battery cell. However, when the battery cell with this structure expands or shrinks during later use, it will cause the casing to deform, which can easily cause The failure of the connection between the electrode assembly and the casing is not conducive to improving the service life and performance of the battery cell. On the other hand, it is very easy to cause the risk of lithium precipitation or internal temperature rise in the battery cell due to unstable electrical connection. This will lead to greater safety risks in the battery cells during later use.

Based on the above considerations, in order to solve the problem that battery cells have great safety hazards in the later use process, which is not conducive to the safety of consumers, the inventor has designed a battery cell after in-depth research. The battery cell includes The casing, the end cover, the electrode assembly and the first current collecting member. The end cover is closed at the opening of the casing. The electrode assembly and the first current collecting member are both arranged in the casing. The electrode assembly has a first pole piece, and a first current collecting member. The pole piece has a first current collecting section, a first current collecting member is sleeved on the outside of the electrode assembly, and the first current collecting member is connected to the end cover and the first current collecting section.

In the above battery cell, the first current collecting member is placed outside the electrode assembly, and the first current collecting section of the first pole piece is connected to the end cover through the first current collecting member, thereby realizing the electrode assembly. For electric energy input or output, the battery cell using this structure can effectively improve the structural stability of the battery cell to reduce the shaking of the electrode assembly in the case during later use, thus helping to reduce the risk of damage caused by the electrode assembly. The shaking causes the risk of connection failure between the first current collecting section of the first pole piece and the end cover. On the other hand, there is no need to realize the input of electric energy through a structure connecting the first current collecting section of the first pole piece to the casing. output, which can effectively alleviate the phenomenon of connection failure with the first current collection section when the battery cell casing expands or shrinks and deforms during later use, thereby reducing the risk of unstable or failed electrical connection of the battery cell. This will help extend the service life of the battery cells, and can effectively reduce the risk of lithium precipitation or internal temperature rise in the battery cells due to unstable electrical connections, thereby reducing potential safety hazards in the later use of the battery cells.

The battery cells disclosed in the embodiments of the present application can be used in, but are not limited to, electrical devices such as vehicles, ships, or aircrafts. The power supply system of the electrical device can be composed of the battery cells and batteries disclosed in this application. In this way, the risk of lithium precipitation or internal temperature rise of the battery cells during later use can be effectively reduced, thereby improving the use of the battery. safety.

Embodiments of the present application provide an electrical device that uses a battery as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

For the convenience of explanation in the following embodiments, an electric device 1000 according to an embodiment of the present application is used as an example.

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 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The battery 100 is disposed inside the vehicle 1000 , and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 . The battery 100 may be used to power the vehicle 1000 , for example, the battery 100 may serve as an operating power source for the vehicle 1000 . The vehicle 1000 may also include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to provide power to the motor 300 , for example, for starting, navigating and driving 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 also can be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel 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 10 and battery cells 20 , and the battery cells 20 are used to be accommodated in the case 10 . Among them, the box 10 is used to provide an assembly space for the battery cells 20, and the box 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12 . The first box body 11 and the second box body 12 cover each other. The first box body 11 and the second box body 12 share a common An assembly space for accommodating the battery cells 20 is defined. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 is covered with the open side of the second box body 12 so that the first box body 11 and the second box body 11 can be connected to each other. The two box bodies 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side cover of the first box body 11 is closed with the second box body 12 Open side. Of course, the box 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a rectangular parallelepiped, etc.

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

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 is not limited thereto. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes. For example, in FIG. 2 , the battery cell 20 is cylindrical.

According to some embodiments of the present application, refer to Figures 3, 4 and 5. Figure 3 is an exploded view of the structure of the battery cell 20 provided by some embodiments of the present application, and Figure 4 is a structural exploded view of the battery cell 20 provided by some embodiments of the present application. 5 is a partial enlarged view of position A of the battery cell 20 shown in FIG. 4 . The present application provides a battery cell 20. The battery cell 20 includes a case 21, an end cover 22, an electrode assembly 23 and a first current collection member 24. The housing 21 has an opening 211 , and the end cover 22 covers the opening 211 . The electrode assembly 23 is accommodated in the housing 21 . The electrode assembly 23 includes a first pole piece. The first pole piece has a first current collection section 231 that is not coated with an active material layer. The first current collecting member 24 is located in the housing 21 and sleeved on the outside of the electrode assembly 23. The first current collecting member 24 is used to connect the end cover 22 and the first current collecting section 231 to realize the connection between the end cover 22 and the first current collecting section 231. The pole pieces are electrically connected.

The first pole piece has a first current collecting section 231 that is not coated with an active material layer, that is, the first current collecting section 231 is a portion of the first pole piece that is not coated with an active material layer.

It should be noted that the first pole piece may be the positive pole piece of the electrode assembly 23 or the negative pole piece of the electrode assembly 23 . For example, in this embodiment, the first pole piece is the negative pole piece of the electrode assembly 23 .

Optionally, the housing 21 may also be used to contain an electrolyte, such as an electrolytic solution. The housing 21 can have various structural forms. The housing 21 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

When assembling the battery cell 20, the electrode assembly 23 can be first placed into the case 21, and the electrolyte is filled into the case 21, and then the end cap 22 is closed with the opening 211 of the case 21 to form a sealed connection. A sealed space is formed for accommodating the electrode assembly 23 and the electrolyte. For example, the end cover 22 is welded to the housing 21 .

The housing 21 can be in various shapes, such as cylinder, rectangular parallelepiped, etc. The shape of the housing 21 can be determined according to the specific shape of the electrode assembly 23 . For example, if the electrode assembly 23 has a cylindrical structure, a cylindrical structure can be selected; if the electrode assembly 23 has a rectangular parallelepiped structure, a rectangular parallelepiped structure can be selected. Of course, the end cap 22 can also have various structures. For example, the end cap 22 can have a plate-like structure, a hollow structure with an opening 211 at one end, etc. For example, in FIG. 3 , the electrode assembly 23 has a cylindrical structure, and the housing 21 is a cylindrical housing 21 .

It can be understood that the battery cell 20 is not limited to the above structure, and the battery cell 20 can also have other structures. For example, the battery cell 20 includes a shell 21 and two end caps 22. The shell 21 is two opposite structures. The hollow structure of the side opening 211 has an end cap 22 corresponding to cover an opening 211 of the housing 21 and form a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte.

The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. The electrode assembly 23 may include a positive electrode piece, a negative electrode piece, and a separator. The electrode assembly 23 may be a rolled structure formed by winding the positive electrode sheet, the isolation film and the negative electrode sheet, or may be a stacked structure formed by a stacked arrangement of the positive electrode sheet, the isolation film and the negative electrode sheet. For example, in FIG. 3 , the electrode assembly 23 is a rolled structure formed by rolling a positive electrode piece, a separator film, and a negative electrode piece.

In some embodiments, the battery cell 20 may also include a pressure relief mechanism, and the pressure relief mechanism may be installed on the end cover 22 or the housing 21 . 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.

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

By arranging the first current collecting member 24 on the outside of the electrode assembly 23 and connecting the first current collecting section 231 of the first pole piece to the end cover 22 through the first current collecting member 24, the electric energy input of the electrode assembly 23 is achieved. Or output, the battery cell 20 using this structure can effectively improve the structural stability of the battery cell 20 to reduce the shaking of the electrode assembly 23 in the housing 21 during later use, thereby conducive to reducing the Due to the shaking of the electrode assembly 23, there is a risk of connection failure between the first current collecting section 231 of the first pole piece and the end cover 22. On the other hand, there is no need to connect the first current collecting section 231 of the first pole piece to the casing 21. structure to realize the input or output of electric energy, thereby effectively mitigating the phenomenon of connection failure between the casing 21 of the battery cell 20 and the first current collecting section 231 when it expands or shrinks and deforms during later use, thereby reducing the number of battery cells. The risk of unstable electrical connection or failure of the battery cell 20 will be beneficial to extending the service life of the battery cell 20, and can effectively reduce the risk of lithium precipitation or internal temperature rise of the battery cell 20 due to unstable electrical connection, thereby reducing There are potential safety hazards in the later use of the battery cells 20 .

According to some embodiments of the present application, refer to FIGS. 4 and 5 , and please further refer to FIG. 6 , which is a cross-sectional view of the first current collecting member 24 provided in some embodiments of the present application. The first current collecting member 24 includes a first connecting part 241 and a second connecting part 242 . Along the thickness direction of the end cover 22 , the first connection portion 241 is located between the end cover 22 and the electrode assembly 23 , and the first connection portion 241 is connected to the end cover 22 . The second connecting part 242 is arranged around the first connecting part 241 . The second connecting part 242 is sleeved on the outside of the electrode assembly 23 and is used to connect with the first current collecting section 231 .

The first connecting part 241 and the second connecting part 242 jointly define a first receiving groove 243 into which the power supply electrode assembly 23 is inserted close to one end of the end cap 22 in the thickness direction of the end cap 22 so that the second connecting part 242 can Set on the outside of the electrode assembly 23 .

Alternatively, the first connecting part 241 and the second connecting part 242 may be of an integrated structure or a split structure. When the first connecting part 241 and the second connecting part 242 are of an integrated structure, the first connecting part 241 and the second connecting part 242 are formed by a stamping or casting process; when the first connecting part 241 and the second connecting part 242 are separate In the case of a one-piece structure, the first connecting part 241 can be connected to the second connecting part 242 by welding, clamping or bolting.

By arranging the first current collecting member 24 as a first connection part 241 and a second connection part 242 connected to each other, and the second connection part 242 is arranged around the first connection part 241, a first connection part of the sleeve structure is formed. The current collecting member 24 adopts this structure. On the one hand, the first current collecting member 24 can improve the assembly stability between the electrode assembly 23 and the first current collecting member 24. On the other hand, by connecting the first connecting portion 241 with the end cover, The 22-connected structure can effectively increase the connection area between the first current collecting member 24 and the end cover 22, thereby helping to ensure the overcurrent stability of the first current collecting member 24 and the end cover 22, so as to reduce the risk of insufficient overcurrent. There is a risk of local temperature rise.

According to some embodiments of the present application, as shown in FIGS. 3 , 4 and 5 , the first current collecting section 231 forms at least part of the outer peripheral surface of the electrode assembly 23 .

The first current collecting section 231 forms at least part of the outer circumferential surface of the electrode assembly 23 , that is, the current collecting section of the first pole piece of the electrode assembly 23 at the end of the winding continues to extend along the circumferential direction of the electrode assembly 23 , thereby forming the electrode assembly. The first current collecting section 231 on the outer peripheral surface of 23.

For example, in FIG. 4 , the first current collecting section 231 forms the entire outer circumferential surface of the electrode assembly 23 , thereby facilitating improvement of the connection between the first current collecting section 231 and the second connection portion 242 of the first current collecting member 24 . Connection area.

At least part of the outer peripheral surface of the electrode assembly 23 is formed by the first current collecting section 231 of the first pole piece. That is to say, the first current collecting section 231 covers the outer peripheral side of the electrode assembly 23 along the circumferential direction of the electrode assembly 23. Therefore, after the first current collecting section 231 is connected to the second connecting portion 242 of the first current collecting member 24, the electrical connection between the first pole piece and the first current collecting member 24 can be realized. The battery cell using this structure 20 On the one hand, there is no need to process tabs for electrical connection with the end cover 22 at the end of the electrode assembly 23, which can effectively reduce the production cost of the battery cell 20 and effectively reduce the friction between the electrode assembly 23 and the end cover 22. The connection difficulty is beneficial to improving the production efficiency of the battery cell 20 . On the other hand, the electrolyte can directly infiltrate the electrode assembly 23 through the end of the electrode assembly 23 , thereby improving the infiltration effect of the electrode assembly 23 .

In some embodiments, the first current collecting section 231 is welded to the inner peripheral surface of the second connecting portion 242 . And/or, the end cap 22 is welded to the first connecting portion 241 .

For example, the first current collecting section 231 and the second connecting part 242 and the end cover 22 and the first connecting part 241 are all welded. In other embodiments, the first current collecting section 231 and the second connecting part 242 and the end cover 22 and the first connecting part 241 may also be connected in abutting manner.

Welding is used to connect the first current collecting section 231 and the second connecting part 242 as well as the end cover 22 and the first connecting part 241, which is beneficial to improving the connection between the first current collecting section 231 and the second connecting part 242 and the end cover 22 and the first connecting part 242. The connection reliability and stability between the connecting parts 241. In addition, by welding the inner peripheral surfaces of the first current collecting section 231 and the second connecting part 242, it is beneficial to increase the connection area between the first current collecting section 231 and the second connecting part 242, thereby ensuring that the first collecting section 231 and the second connecting part 242 are connected. The flow area between the flow section 231 and the second connecting part 242.

According to some embodiments of the present application, with reference to Figures 7, 8 and 9, Figure 7 is a cross-sectional view of the battery cell 20 provided by some further embodiments of the present application, and Figure 8 is B of the battery cell 20 shown in Figure 7 9 is a partial enlarged view of the first current collecting member 24 and the second current collecting member 25 of the battery cell 20 according to some embodiments of the present application. Along the thickness direction of the end cover 22 , the first current collecting section 231 forms an end of the electrode assembly 23 facing away from the end cover 22 . The battery cell 20 also includes a second current collecting member 25. The second current collecting member 25 is located in the casing 21 and is sleeved on the outside of the electrode assembly 23. The second current collecting member 25 is connected to the second connecting portion 242 and the second current collecting member 25. Episode 231.

Among them, the first current collecting section 231 forms an end of the electrode assembly 23 facing away from the end cover 22 , that is, the first pole piece is formed with a tab for electrical connection with the end cover 22 at an end of the electrode assembly 23 facing away from the end cover 22 , and the tab is The portion of the current collector of the first pole piece that is not coated with the active material layer. The first current collecting section 231 is connected to the second current collecting member 25 , and the second current collecting member 25 is connected to the first current collecting member 24 to achieve electrical connection between the first current collecting section 231 and the end cover 22 .

The first current collecting member 24 of the first pole piece is disposed on an end of the electrode assembly 23 away from the end cover 22 and the second current collecting member 25 is sleeved on the outside of the electrode assembly 23 to pass the second current collecting member. 25 The second connection portion 242 connecting the first current collecting section 231 and the first current collecting structure can realize the electrical connection between the first pole piece and the end cover 22, has a simple structure and is easy to manufacture.

According to some embodiments of the present application, please continue to refer to FIG. 7 , FIG. 8 and FIG. 9 , the second current collecting member 25 includes a third connection part 251 and a fourth connection part 252 . Along the thickness direction of the end cover 22 , the third connecting portion 251 is located on a side of the first current collecting section 231 away from the end cover 22 , and the third connecting portion 251 is connected to the first current collecting section 231 . The fourth connecting part 252 is arranged around the third connecting part 251 . The fourth connecting part 252 is sleeved on the outside of the electrode assembly 23 and connected to the second connecting part 242 .

The third connection part 251 and the fourth connection part 252 jointly define a second receiving groove 253 into which the end of the power supply electrode assembly 23 far away from the end cap 22 in the thickness direction of the end cap 22 is inserted, so that the fourth connection part 252 can Set on the outside of the electrode assembly 23 . After the first current collecting member 24 is connected to the second current collecting member 25, the first receiving groove 243 of the first current collecting member 24 and the second receiving groove 253 of the second current collecting member 25 jointly define a space for receiving the electrode assembly. 23 accommodating cavity.

For example, the second current collecting member 25 is made of copper.

Optionally, the third connecting part 251 and the fourth connecting part 252 may be of an integrated structure or a split structure. When the third connecting part 251 and the fourth connecting part 252 are of an integrated structure, the third connecting part 251 and the fourth connecting part 252 are formed by a stamping or casting process; when the third connecting part 251 and the fourth connecting part 252 are separate In the case of a one-piece structure, the third connecting part 251 can be connected to the fourth connecting part 252 by welding, clamping or bolting.

By arranging the second current collecting member 25 as a third connection part 251 and a fourth connection part 252 connected to each other, and the fourth connection part 252 is surrounding the third connection part 251 , a second part of the sleeve structure is formed. The current collecting member 25 and the second current collecting member 25 adopting this structure can, on the one hand, improve the assembly stability and reliability between the electrode assembly 23 and the second current collecting member 25 , and on the other hand, by connecting the third connecting portion 251 The structure connected to the first current collecting section 231 of the first pole piece can effectively increase the connection area between the second current collecting member 25 and the first current collecting section 231, thereby ensuring that the second current collecting member 25 and the first current collecting section 231 are connected. The overflow stability of the current collecting section 231 is to reduce the risk of local temperature rise due to insufficient overflow.

According to some embodiments of the present application, as shown in FIGS. 8 and 9 , along the thickness direction of the end cover 22 , portions of the second connecting portion 242 and portions of the fourth connecting portion 252 are overlapped and welded to each other to form an overlapping area.

Parts of the second connection part 242 and parts of the fourth connection part 252 overlap each other and are welded, that is, in the thickness direction of the end cover 22 , the part of the fourth connection part 252 extends to the inner circumferential side of the second connection part 242 Or the outer peripheral side, so as to form an overlapping area that overlaps each other, and the overlapping portions of the second connecting portion 242 and the fourth connecting portion 252 are welded to each other. For example, in FIG. 9 , a portion of the fourth connecting portion 252 extends to the inner peripheral side of the second connecting portion 242 to form an overlapping area.

By overlapping and welding the connecting parts of the second connection part 242 and the fourth connection part 252, the connection stability and reliability of the first current collecting member 24 and the second current collecting member 25 can be effectively improved to reduce the first There is a risk of desoldering between the current collecting component 24 and the second current collecting component 25, and it is beneficial to increase the contact area between the first current collecting component 24 and the second current collecting component 25 to ensure overcurrent stability.

In some embodiments, the first current collecting section 231 is welded to the third connecting portion 251 . And/or, the end cap 22 is welded to the first connecting portion 241 .

For example, the first current collecting section 231 and the third connecting part 251 and the end cover 22 and the first connecting part 241 are all welded. In other embodiments, the first current collecting section 231 and the third connecting part 251 and the end cover 22 and the first connecting part 241 may also be connected in abutting manner.

Using welding to connect the first current collecting section 231 and the third connecting part 251 and the end cover 22 and the first connecting part 241 is beneficial to improve the connection between the first current collecting section 231 and the third connecting part 251 and the end cover 22 and the first connecting part 241 . The connection stability and reliability between the connecting parts 241.

According to some embodiments of the present application, please refer to FIG. 10 , which is a partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application. Electrode terminals 221 are installed insulatingly on the end cap 22 . The electrode assembly 23 also includes a second pole piece. The second pole piece has a second current collection section 232 that is not coated with the active material layer. Along the thickness direction of the end cover 22, the second current collection section 232 forms the electrode assembly 23 close to the end cover. At one end of 22 , the second current collection section 232 is used to be connected to the electrode terminal 221 to achieve electrical connection between the second pole piece and the electrode terminal 221 .

The second current collection section 232 forms an end of the electrode assembly 23 close to the end cover 22 , that is, the second pole piece forms a tab for electrical connection with the electrode terminal 221 at an end of the electrode assembly 23 close to the end cover 22 . The polarity of the second pole piece is opposite to that of the first pole piece. In this embodiment, the second pole piece is a positive pole piece.

In the above description, the electrode terminal 221 is insulated and installed on the end cover 22 , that is, the electrode terminal 221 and the end cover 22 are not electrically connected. The electrode terminal 221 and the end cover 22 are two components of the battery cell 20 with opposite polarities.

For example, in Figure 10, a mounting hole is opened on the end cover 22, the electrode terminal 221 is inserted into the mounting hole, and an insulating plastic 222 is provided between the electrode terminal 221 and the end cover 22 to achieve insulation of the electrode terminal 221. Installed on end cap 22. Correspondingly, as shown in FIGS. 6 and 10 , a through hole 2411 through which the power supply terminal 221 passes is formed on the first connecting portion 241 of the first current collecting member 24 so that the electrode terminal 221 can communicate with the second current collecting section. 232 connections.

Optionally, the battery cell 20 may further include a third current collecting member 26. The third current collecting member 26 is disposed in the housing 21, and is located between the electrode terminal 221 and the end cover 22 in the thickness direction. Between the second current collecting sections 232 , the electrode terminal 221 and the second current collecting section 232 are connected through the third current collecting member 26 to realize the electrical connection between the second pole piece and the electrode terminal 221 .

The second current collecting section 232 is welded to the third current collecting member 26 , and the third current collecting member 26 is welded to the electrode terminal 221 . In other embodiments, the second current collecting section 232 can also be in contact with the third current collecting section 232 . Similarly, the current collecting member 26 and the third current collecting member 26 can also be in contact with the electrode terminal 221 to achieve electrical connection between the second pole piece and the electrode terminal 221 . Of course, the second current collecting section 232 and the electrode terminal 221 may also be directly connected, for example, welded or abutted.

For example, the third current collecting member 26 has a disc-shaped structure, and the material of the third current collecting member 26 is aluminum. Of course, in other embodiments, the third current collecting member 26 may have a variety of structures and materials. For example, the third current collecting member 26 may have a polygonal disk-shaped structure, and the third current collecting member 26 may be made of copper or nickel. wait.

In some embodiments, please continue to refer to FIG. 10 , a central channel 233 is formed at the center of the electrode assembly 23 , and an injection hole 2211 is provided on the electrode terminal 221 for injecting electrolyte into the housing 21 . The central channel 233 Connected to the liquid injection hole 2211.

The battery cell 20 further includes a sealing member 27 , which is provided on the electrode terminal 221 , and the sealing member 27 is configured to block the liquid injection hole 2211 .

For example, the sealing member 27 may be made of rubber, silicone or plastic.

By disposing the second current collecting section 232 of the second pole piece at one end of the electrode assembly 23 close to the end cover 22 and connecting it to the electrode terminal 221 on the end cover 22, the input or output of electric energy of the second pole piece is realized. Adopting this structure of the electrode assembly 23 is beneficial to ensuring that there is sufficient ventilation space in the center of the electrode assembly 23. On the one hand, it is convenient to add electrolyte into the casing 21 during later use, and on the other hand, it is convenient to install the battery cells 20. The internal gas circulation can alleviate the phenomenon that the internal air pressure of the battery cell 20 is too high, thereby improving the safety performance of the battery cell 20 .

According to some embodiments of the present application, as shown in FIG. 10 , the battery cell 20 further includes an insulator 28 . The insulating member 28 is disposed between the first current collecting member 24 and the second current collecting section 232 , and the insulating member 28 is configured to insulate and isolate the first current collecting member 24 and the second current collecting section 232 .

The insulating member 28 includes a first part 281 and a second part 282. The first part 281 is located between the first connecting part 241 and the third current collecting member 26 along the thickness direction of the end cover 22. The second part 282 surrounds the first part. 281, the second part 282 is sleeved on the outside of the electrode assembly 23, and the second part 282 is located between the second connection part 242 and the electrode assembly 23 to realize the first current collecting member 24 and the second current collecting section 232 and between the first current collecting member 24 and the third current collecting member 26 .

For example, the material of the insulating member 28 may be rubber, plastic or silicone.

In some embodiments, as shown in FIGS. 6 and 10 , an escape groove 2421 is formed on the inner peripheral surface of the second connecting portion 242 of the first current collecting member 24 . The escape groove 2421 is used to accommodate the second portion of the insulating member 28 . portion 282 to reduce the gap between the second connection portion 242 of the first current collection member 24 and the electrode assembly 23, thereby facilitating the first current collection between the second connection portion 242 of the first current collection member 24 and the first pole piece. Section 231 is connected.

By disposing the insulating member 28 between the first current collecting member 24 and the second current collecting section 232 of the second pole piece, insulation isolation between the first current collecting member 24 and the second current collecting section 232 can be achieved. This effectively alleviates the short circuit phenomenon between the first pole piece and the second pole piece, thereby helping to reduce the risk of internal short circuit in the battery cell 20 .

According to some embodiments of the present application, the end cover 22 , the first current collecting member 24 and the first current collecting section 231 are made of the same material.

By arranging the end cap 22 , the first current collecting member 24 and the first current collecting section 231 to be made of the same material, interconnection between components of the same material is facilitated and the manufacturing difficulty of the battery cell 20 is reduced.

In some embodiments, both the end cap 22 and the first current collecting member 24 are made of copper. Correspondingly, the material of the first current collection section 231 of the first pole piece is also copper. Of course, in other embodiments, the material of the end cap 22 and the first current collecting member 24 may also be nickel or aluminum.

By setting the material of the end cover 22 and the first current collecting member 24 to copper, it is beneficial to reduce the resistivity of the end cover 22 and the first current collecting member 24, thereby effectively reducing the internal resistance of the battery cell 20, so as to Improve the performance of the battery cell 20 .

According to some embodiments of the present application, the present application also provides a battery 100, which includes a box 10 and a battery cell 20 of any of the above solutions. The battery cell 20 is used to be accommodated in the box 10.

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

The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

According to some embodiments of the present application, as shown in Figures 3 to 6, the present application provides a battery cell 20, including a case 21, an end cover 22, an electrode assembly 23, a first current collecting member 24, a third Current collecting member 26 and insulator 28 . The housing 21 has an opening 211, and the end cover 22 covers the opening 211. The end cover 22 is insulated with electrode terminals 221. The electrode assembly 23 is accommodated in the casing 21. The electrode assembly 23 includes a first pole piece and a second pole piece with opposite polarities. The first pole piece has a first current collection section 231 that is not coated with an active material layer. The flow section 231 forms the outer peripheral surface of the electrode assembly 23. The second pole piece has a second current collecting section 232 that is not coated with an active material layer. The second current collecting section 232 forms an end of the electrode assembly 23 close to the end cover 22. The third current collecting section 232 forms an end of the electrode assembly 23 close to the end cover 22. The current collecting member 26 is disposed between the second current collecting section 232 and the end cover 22 along the thickness direction of the end cover 22 . The second current collecting section 232 is connected to the electrode terminal 221 through the third current collecting member 26 . The first current collecting member 24 includes a first connection part 241 and a second connection part 242. The first connection part 241 is provided between the end cap 22 and the electrode assembly 23 along the thickness direction of the end cap 22. The first connection part 241 is connected to The end cover 22 has a second connecting part 242 surrounding the first connecting part 241 and is sleeved on the outside of the electrode assembly 23. The inner peripheral surface of the second connecting part 242 is connected to the first current collector. Segment 231 to achieve electrical connection between the first pole piece and the end cover 22 . A portion of the insulating member 28 is located between the electrode assembly 23 and the second connection portion 242 of the first current collecting member 24 , and a portion of the insulating member 28 is located between the third current collecting member 26 and the first connecting portion of the first current collecting member 24 241, the first current collecting member 24 and the second current collecting section 232 are isolated by insulation.

Embodiments of the present application also provide a manufacturing method of the battery cell 20. Please refer to FIG. 11. FIG. 11 is a schematic flow chart of a manufacturing method of the battery cell 20 provided by some embodiments of the present application. The manufacturing method includes:

S100: Provide a housing 21 with an opening 211;

S200: Provide end cap 22;

S300: Provide an electrode assembly 23. The electrode assembly 23 includes a first pole piece, and the first pole piece has a first current collection section 231 that is not coated with an active material layer;

S400: Provide the first current collecting component 24;

S500: Set the first current collecting member 24 on the outside of the electrode assembly 23, and connect the first current collecting member 24 to the first current collecting section 231;

S600: Accommodate the electrode assembly 23 and the first current collecting member 24 in the housing 21;

S700: Cover the end cap 22 with the opening 211, and connect the end cap 22 with the first current collecting member 24.

It should be noted that the relevant structure of the battery cell 20 manufactured by the manufacturing method provided in the above embodiments can be referred to the battery cell 20 provided in the above embodiments, and will not be described again here.

Embodiments of the present application also provide a manufacturing equipment for battery cells 20. Please refer to FIG. 12. FIG. 12 is a schematic block diagram of manufacturing equipment for battery cells 20 provided by some embodiments of the present application. The manufacturing equipment includes a first providing device, a second providing device, a third providing device, a fourth providing device, a first assembling device, a second assembling device and a third assembling device.

The first providing device is used to provide the housing 21 with the opening 211 . The second providing means is used to provide the end cap 22 . The third providing device is used to provide the electrode assembly 23. The electrode assembly 23 includes a first pole piece, and the first pole piece has a first current collection section 231 that is not coated with an active material layer. The fourth providing device is used to provide the first current collecting member 24 . The first assembly device is used to sleeve the first current collecting member 24 on the outside of the electrode assembly 23 and connect the first current collecting member 24 to the first current collecting section 231 . The second assembly device is used to accommodate the electrode assembly 23 and the first current collecting member 24 in the housing 21 . The third assembly device is used to cover the end cap 22 with the opening 211 and connect the end cap 22 with the first current collecting member 24 .

It should be noted that the relevant structures of the battery cells 20 manufactured by the manufacturing equipment provided in the above embodiments can be referred to the battery cells 20 provided in the above embodiments, and will not be described again here.

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application 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, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims

A battery cell including:

A shell with an opening;

An end cap, covering the opening;

An electrode assembly, accommodated in the housing, the electrode assembly including a first pole piece, the first pole piece having a first current collection section that is not coated with an active material layer; and

A first current collecting member is located in the housing and sleeved on the outside of the electrode assembly. The first current collecting member is used to connect the end cover and the first current collecting section to achieve the above-mentioned The end cap is electrically connected to the first pole piece.
The battery cell according to claim 1, wherein the first current collecting member includes:

A first connection part, along the thickness direction of the end cap, the first connection part is located between the end cap and the electrode assembly, and the first connection part is connected to the end cap;

The second connection part is arranged around the first connection part. The second connection part is sleeved on the outside of the electrode assembly and is used to connect with the first current collecting section.
The battery cell according to claim 2, wherein the first current collecting section forms at least part of an outer peripheral surface of the electrode assembly.
The battery cell according to claim 3, wherein the first current collecting section is welded to the inner peripheral surface of the second connection part; and/or

The end cap is welded to the first connecting part.
The battery cell according to claim 2, wherein along the thickness direction of the end cover, the first current collection section forms an end of the electrode assembly facing away from the end cover;

The battery cell further includes a second current collecting member. The second current collecting member is located in the housing and sleeved on the outside of the electrode assembly. The second current collecting member is connected to the second current collecting member. The connecting part and the first current collecting section.
The battery cell according to claim 5, wherein the second current collecting member includes:

The third connection part is located on the side of the first collector section away from the end cap along the thickness direction of the end cover. The third connection part is connected to the first collector section. flow section;

The fourth connection part is arranged around the third connection part. The fourth connection part is sleeved on the outside of the electrode assembly and connected to the second connection part.
The battery cell according to claim 6, wherein portions of the second connection portion and the fourth connection portion are overlapped and welded to each other along the thickness direction of the end cover to form an overlapping area.
The battery cell according to claim 6 or 7, wherein the first current collecting section is welded to the third connection part; and/or

The end cap is welded to the first connecting part.
The battery cell according to any one of claims 1 to 8, wherein the end cap is insulated with electrode terminals;

The electrode assembly also includes a second pole piece, the second pole piece has a second current collection section that is not coated with the active material layer, and along the thickness direction of the end cap, the second current collection section forms the One end of the electrode assembly is close to the end cap, and the second current collection section is used to be connected to the electrode terminal to achieve electrical connection between the second pole piece and the electrode terminal.
The battery cell according to claim 9, wherein the battery cell further includes:

An insulating member is provided between the first current collecting member and the second current collecting section, and the insulating member is configured to insulate and isolate the first current collecting member and the second current collecting section.
The battery cell according to any one of claims 1 to 10, wherein the end cover, the first current collecting member and the first current collecting section are made of the same material.
The battery cell according to any one of claims 1 to 11, wherein the end cap and the first current collecting member are both made of copper.
A battery including:

box; and

The battery cell according to any one of claims 1 to 12, which is used to be accommodated in the box.
An electrical device comprising the battery according to claim 13.
A method of manufacturing a battery cell, including:

providing a housing having an opening;

End caps provided;

An electrode assembly is provided, the electrode assembly including a first pole piece having a first current collection section that is not coated with an active material layer;

Provide the first collection component;

The first current collecting member is placed on the outside of the electrode assembly, and the first current collecting member is connected to the first current collecting section;

accommodating the electrode assembly and the first current collecting member in the housing;

The end cap is closed on the opening, and the end cap is connected to the first current collecting member.
A battery cell manufacturing equipment, including:

a first providing device for providing a housing, the housing having an opening;

a second providing device for providing an end cap;

a third providing device for providing an electrode assembly, the electrode assembly including a first pole piece having a first current collection section that is not coated with an active material layer;

a fourth providing device for providing the first current collecting member;

a first assembly device for placing the first current collecting member on the outside of the electrode assembly and connecting the first current collecting member to the first current collecting section;

a second assembly device for accommodating the electrode assembly and the first current collecting member in the housing; and

A third assembly device is used to cover the end cap with the opening and connect the end cap with the first current collecting member.