CN219123424U - Battery cells, batteries, electrical equipment and welding equipment - Google Patents

Abstract

Embodiments of the present application provide a battery cell, a battery, electrical equipment, and welding equipment. The first aspect of the embodiment of the present application provides a battery cell, including a casing, the casing is formed with an opening; an electrode assembly, the electrode assembly is located in the casing, the electrode assembly includes a first tab, and the first tab is provided with multiple layers; The end cover, the end cover covers the opening; the first electrode terminal is arranged on the end cover; and the first current collector is used to connect the first tab and the first electrode terminal; wherein, the first current collector includes a first connection section , the first connection section extends between the multi-layer first tabs and is connected to the first tabs. The first connection section provided by the first aspect of the embodiment of the present application extends into the first tab, which improves the reliability of the battery cell.

Description

Battery cells, batteries, electrical equipment and welding equipment

technical field

The embodiments of the present application relate to the field of batteries, and in particular to a battery cell, a battery, electrical equipment, and welding equipment.

Background technique

The battery cell has the advantages of small size, high energy density, high power density, many cycle times and long storage time, and is widely used in some electronic equipment, electric vehicles, electric toys and electric equipment, for example, the battery cell It is widely used in mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools.

With the continuous development of technology, higher requirements are put forward for the performance of battery cells. The market requires that battery cells must have sufficient reliability. How to improve the reliability of battery cells has become an urgent problem to be solved.

Utility model content

In view of the above problems, embodiments of the present application provide a battery cell, a battery, electrical equipment, and welding equipment, which can improve the reliability of the battery cell.

In the first aspect, the embodiment of the present application provides a battery cell, including a casing, the casing is formed with an opening; an electrode assembly, the electrode assembly is located in the casing, the electrode assembly includes a first tab, and the first tab is provided with a multi-layer an end cover, the end cover covers the opening; a first electrode terminal, the first electrode terminal is disposed on the end cover; and a first current collector, the first current collector is used to connect the first tab and the first electrode terminal. The first current collector includes a first connection section, which extends into between the first tab layers and is connected to the first tab.

By inserting the first connecting segment between the layers of the first tab, there are tabs on both sides of the first connecting segment, compared to the case where the multi-layer first tabs are all on one side of the first connecting segment In the welding process, the number of lug layers that need to be penetrated on one side of the first connection section is reduced, reducing the possibility of false welding problems and improving the reliability of the battery cell.

According to some embodiments of the first aspect of the present application, the difference in the number of layers of the first tabs on both sides of the first connecting segment is less than six.

By setting the difference in the number of layers of the first tabs on both sides of the first connection section to be less than 6, the difference in the number of layers of the first tabs on both sides of the first connection section during welding is not much different, and the welding time is almost the same. Avoiding the situation that the number of layers of the first tab on one side is much smaller than that on the other side, resulting in the problem of welding through the first tab on the side with fewer layers during welding.

According to some embodiments of the first aspect of the present application, the first current collector further includes a second connecting section and a third connecting section that are bent to each other, and the third connecting section is arranged between the electrode assembly and the end cap and connected to the first connecting section.

One electrode terminal connection, the first tab is set towards the inner wall of the housing, the second connecting section is arranged between the first tab O and the inner wall of the housing and connects the first connecting section and the third connecting section, the second connecting section is perpendicular to first party

The first direction is the direction in which the first tab is led out from the electrode assembly.

The third connection section is connected to the first electrode terminal, and the second connection section is connected to the first connection section and the third connection section, so that the electric energy generated by the electrode assembly is guided to the outside of the battery cell through the first connection section.

5 According to some embodiments of the first aspect of the present application, the first connection section protrudes from the second connection section toward

towards the surface of the first lug.

By arranging the first connection section to protrude from the surface of the second connection section facing the first tab, the first connection section can have a structure that can extend into the first tab layer.

According to some embodiments of the first aspect of the present application, the first connecting section and the second connecting section are integrated into an O-shape.

The integral molding of the first connecting section and the second connecting section can simplify the manufacturing process of the first connecting section and the second connecting section, and also enhance the connection strength between the first connecting section and the second connecting section.

According to some embodiments of the first aspect of the present application, the winding of the first tab is arranged in multiple layers, and the first connecting section is located at the winding center of the first tab.

5 By setting the first connecting section at the winding center of the first tab, the winding center has more clearance space relative to other positions of the first tab, and this space can make it easier for the first connecting section to be inserted into the first tab. Tabs improve assembly efficiency.

According to some embodiments of the first aspect of the present application, the first connecting segment is spaced apart from the corner of the first tab.

The risk of interference between the first connecting section and the corner is reduced by setting the first connecting section at a distance from the corner, and the assembly efficiency is improved.

According to some embodiments of the first aspect of the present application, the electrode assembly further includes a second tab, and the second tab is opposite in polarity to the first tab; the battery cell further includes a second electrode terminal and a second current collector, The second current collector includes a bent terminal connection part and a tab connection part, the terminal connection part is arranged between the electrode assembly and the end cover and connected to the second electrode terminal, and the tab connection part faces the casing from the terminal connection part The bottom wall of the body extends and connects to the second tab, and the first connecting section and the tab connecting portion are arranged perpendicular to each other.

The second electrode terminal and the second tab are connected by setting the second current collector, so that electric energy is guided to the outside of the battery cell through the second electrode terminal. By arranging the first connection section and the tab connection portion perpendicular to each other, the assembly of the battery cells can be better achieved without wasting the internal space of the battery cells, and also avoiding interference with other components and causing reliability problems.

According to some embodiments of the first aspect of the present application, the material of the first current collector includes aluminum or aluminum alloy.

When aluminum or aluminum alloy is used as the material of the first current collecting piece, the first current collecting piece is made of the same material as the first tab, which is more conducive to realizing the welding of the first current collecting piece and the first tab.

In a second aspect, an embodiment of the present application provides a battery, and the battery includes a battery cell.

The battery using the battery monomer reduces the possibility of false welding and improves the reliability of the battery.

In a third aspect, embodiments of the present application provide an electric device, where the electric device includes a battery cell.

The electrical equipment using the battery cell reduces the possibility of false welding and improves the reliability of the electrical equipment.

In a fourth aspect, an embodiment of the present application provides a welding device. The welding device includes a first welding head and a second welding head. Both the first welding head and the second welding head are equipped with ultrasonic transmitters. The first welding head and the second welding head The welding head is used to weld the parts to be welded.

By setting the welding equipment with two welding heads, the two welding heads can be used to weld the welded parts at the same time. Using the welding equipment to weld the battery cells can improve the welding efficiency, reduce the possibility of false welding, and improve the reliability of the battery cells.

According to some embodiments of the fourth aspect of the present application, the first welding head and the second welding head are respectively arranged on both sides of the piece to be welded, and the piece to be welded includes the first connecting section of the first current collector and multiple electrode assemblies. The first tab of the layer, the first connection section is located between the first tabs of the layers.

By arranging the first welding head and the second welding head to be respectively located on both sides of the first connection section and the multi-layer first tab, the number of tab layers that need to be welded by each welding head on both sides of the first connection section is reduced , can improve welding efficiency, reduce the possibility of false welding, and improve the reliability of battery cells.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the accompanying drawings on the premise of not paying creative efforts.

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

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

Fig. 2 is a schematic structural diagram of a battery provided by some embodiments of the present application;

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

Fig. 4 is a schematic structural diagram of an end cap provided in some embodiments of the present application;

Fig. 5 is a schematic structural diagram of a current collecting member and a tab provided in some embodiments of the present application;

Fig. 6 is a schematic diagram of welding equipment provided by some embodiments of the present application;

The attached figures are as follows: Icon: 1000-vehicle; 100-battery; 200-motor; 300-controller; 101-box; 1011-first part; 1012-second part; A-battery unit; ;11-opening; 12-inner wall; 2-electrode assembly; 21-first tab; 211-corner; 212-winding center; 22-second tab; 3-end cover; 4-first electrode terminal ;5-the second electrode terminal; 6-the first current collector; 61-the first connection section; 62-the second connection section; 63-the third connection section; 7-the second current collector; 71-the tab connection 72-terminal connection part; X-first direction; Y-second direction; Z-third direction; 81-first welding head; 82-second welding head; 83-ultrasonic transmitter.

Detailed ways

The implementation manner of the present application will be further described in detail below with reference to the drawings and embodiments. The detailed description and drawings of the following embodiments are used to illustrate the principles of the application, but not to limit the scope of the application, that is, the application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise specified, the meaning of "plurality" is more than two; the terms "upper", "lower", "left", "right", "inner", " The orientation or positional relationship indicated by "outside" and so on are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a reference to this application. Application Restrictions. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

The orientation words appearing in the following description are the directions shown in the figure, and do not limit the specific structure of the application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

In the embodiment of the present application, the battery cell may be a secondary battery, and the secondary battery refers to a battery cell that can be charged to activate the active material and continue to be used after the battery cell is discharged.

The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead storage batteries, etc., the embodiment of the present application This is not limited.

A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a battery cell, active ions (such as lithium ions) are intercalated and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the short circuit of the positive and negative electrodes and allow active ions to pass through.

In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode collector and a positive electrode active material disposed on at least one surface of the positive electrode collector.

As an example, the positive electrode current collector has two opposing surfaces in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposing surfaces of the positive electrode current collector.

As an example, a metal foil or a composite current collector may be used as the positive electrode current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming metal materials (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate ester, polybutylene terephthalate, polystyrene, polyethylene, etc.)

In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

As an example, the negative electrode current collector has two opposing surfaces in its own thickness direction, and the negative electrode active material is disposed on any one or both of the two opposing surfaces of the negative electrode current collector.

As an example, a metal foil or a composite current collector may be used as the negative electrode current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The composite current collector may include a polymer material base layer and a metal layer. Composite current collectors can be formed by metal materials (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver and silver alloys, etc.) on polymer material substrates (such as polypropylene, polyethylene terephthalate ester, polybutylene terephthalate, polystyrene, polyethylene, etc.)

In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

In some embodiments, the separator is a separator. The present application has no particular limitation on the type of the isolation membrane, and any known porous structure isolation membrane with good chemical stability and mechanical stability can be selected.

As an example, the main material of the isolation film may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator can be a single-layer film or a multi-layer composite film, without any particular limitation. When the separator is a multilayer composite film, the materials of each layer may be the same or different, and there is no particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

In some embodiments, the shape of the electrode assembly may be cylindrical, flat or polygonal.

In some embodiments, the electrode assembly is provided with tabs, which can conduct current from the electrode assembly. Tabs include positive tabs and negative tabs.

In some embodiments, a battery cell may include a housing. The casing is used to encapsulate components such as electrode assemblies and electrolytes. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell or other shaped battery cells, and the prismatic battery cell includes a prismatic battery cell, a blade-shaped battery cell, a multi The prismatic battery and the polygonal prismatic battery are, for example, hexagonal prismatic batteries, etc., which are not particularly limited in this application.

In some embodiments, the casing includes an end cover and a casing, the casing is provided with an opening, and the end cover closes the opening to form a closed space for containing the electrode assembly, electrolyte and other substances. The housing may have one or more openings. One or more end caps can also be provided.

In some embodiments, at least one electrode terminal is provided on the casing, and the electrode terminal is electrically connected to the tab. The electrode terminals can be directly connected to the tabs, or can be indirectly connected to the tabs through transition parts. The electrode terminals can be arranged on the end cap or on the casing.

The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module of higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in parallel through the busbar.

In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

In some embodiments, the battery may be a battery pack, the battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, part of the box may become at least part of the floor of the vehicle, or part of the box may become at least part of the cross and side members of the vehicle.

In some embodiments, a battery may be an energy storage device. Energy storage devices include energy storage containers, energy storage electric cabinets, etc.

The technical solutions described in the embodiments of the present application are applicable to various electric devices using batteries, such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, vehicles, ships and spacecraft, etc., for example, spacecraft Including airplanes, rockets, space shuttles and spaceships etc.

With the continuous development of technology, the market puts forward higher requirements on the performance of battery cells. The market requires that battery cells must have sufficient reliability. However, when the battery cells are ultrasonically welded, there is a problem of false welding in the tabs, which affects the reliability of the battery cells.

Therefore, how to reduce the possibility of false welding and improve the reliability of the battery cells has become a problem that is constantly explored by those skilled in the art.

Based on the above considerations, the embodiment of the present application designs a battery cell, a battery, an electrical device, and a welding device. The first aspect of the embodiment of the present application provides a battery cell, including a casing, the casing is formed with an opening; an electrode assembly, the electrode assembly is located in the casing, the electrode assembly includes a first tab, and the first tab is provided with multiple layers; The end cover, the end cover covers the opening; the first electrode terminal is arranged on the end cover; and the first current collector is used to connect the first tab and the first electrode terminal; wherein, the first current collector includes a first connection section , the first connection section extends between the multi-layer first tabs and is connected to the first tabs.

After setting the first connection section to extend between the first tabs, there are tabs on both sides of the first connection section. Compared with the situation where the multi-layer first tabs are on one side of the first connection section, The number of tab layers that need to be penetrated during the welding process is reduced, reducing the possibility of false welding problems and improving the reliability of the battery cell.

It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use battery cells. However, for the sake of brevity, the following embodiments take electric vehicles as examples illustrate.

For example, as shown in Figure 1, Figure 1 shows a vehicle 1000 according to an embodiment 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 Automobiles or extended-range vehicles, etc. A battery 100 , a controller 300 and a motor 200 may be provided inside the vehicle 1000 , and the controller 300 is used to control the battery 100 to supply power to the motor 200 . For example, the battery 100 may be provided at the bottom or front or rear 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 , for a circuit system of the vehicle 1000 , for example, for starting, navigating, and working power requirements of the vehicle 1000 . In another embodiment 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 .

In order to meet different power requirements, the battery 100 may include a plurality of battery cells A, where the multiple battery cells A may be connected in series, in parallel or in parallel, and the hybrid connection refers to a mixture of series and parallel connections. The battery 100 may also be called a battery pack. Optionally, please combine Figure 2 and Figure 3. Figure 2 shows a battery, and Figure 3 shows a battery cell A. Multiple battery cells A can be connected in series, in parallel, or in combination. A battery module, a plurality of battery modules are connected in series, in parallel or in series to form the battery 100 . That is to say, a plurality of battery cells A may directly form the battery 100 , or may first form a battery module, and the battery module then forms the battery 100 .

The battery 100 may include a plurality of battery cells A. As shown in FIG. The battery 100 may also include a box body 101 (or called a cover body). The inside of the box body 101 is a hollow structure, and a plurality of battery cells A are accommodated in the box body 101 . The box body 101 may include two parts for accommodating (refer to FIG. 2 ), referred to here as a first part 1011 and a second part 1012 respectively, and the first part 1011 and the second part 1012 are fastened together. The shapes of the first part 1011 and the second part 1012 may be determined according to the combined shape of a plurality of battery cells A, and each of the first part 1011 and the second part 1012 may have an opening. For example, both the first part 1011 and the second part 1012 can be hollow cuboids and each has only one face as an open face, the opening of the first part 1011 and the opening of the second part 1012 are arranged oppositely, and the first part 1011 and the second part 1012 are interlocked Combined to form a box 101 with a closed chamber. Among the first part 1011 and the second part 1012, one can also be a cuboid with an opening, and the other can be an end cap structure to close the opening of the cuboid. A plurality of battery cells A are connected in parallel, in series or mixed, and placed in the box 101 formed by fastening the first part 1011 and the second part 1012 .

Optionally, the battery 100 may also include other structures. For example, the battery 100 may further include a confluence part, which is used to realize electrical connection between a plurality of battery cells A, such as parallel connection, series connection or mixed connection. Specifically, the current-combining component can realize the electrical connection between the battery cells A by connecting the electrode terminals of the battery cells A. Further, the bus member may be fixed to the electrode terminal of the battery cell A by welding. The electric energy of the plurality of battery cells A can be further drawn out through the box body 101 through the conductive mechanism. Optionally, the conduction means can also belong to the current-collecting part.

Please refer to FIG. 3 to FIG. 4 , in the first aspect, the embodiment of the present application provides a battery cell A, including a casing 1, the casing 1 is formed with an opening 11; an electrode assembly 2, the electrode assembly 2 is located in the casing 1, The electrode assembly 2 includes a first tab 21, the first tab 21 is provided with multiple layers; an end cover 3, the end cover 3 covers the opening 11; a first electrode terminal 4, the first electrode terminal 4 is arranged on the end cover 3; and a second A current collector 6 , the first current collector 6 is used to connect the first tab 21 and the first electrode terminal 4 . The first current collector 6 includes a first connection section 61 , and the first connection section 61 protrudes between multiple layers of the first tab 21 and is connected to the first tab 21 .

The first tab 21 may be a positive tab or a negative tab, which is not limited here.

Multi-layer means that there are multiple first tabs 21 and they are stacked together.

The first electrode terminal 4 may be a positive electrode terminal or a negative electrode terminal, corresponding to the polarity of the first tab 21 . For example, when the first tab 21 is a positive tab, the first electrode terminal 4 is a positive electrode terminal.

In some embodiments, the first electrode terminal 4 is insulated from the end cap 3 .

The first electrode terminal 4 is connected to the first tab 21 through the first current collector 6 , so that electric energy is guided to the outside of the battery cell A through the first electrode terminal 4 .

The first connection section 61 is a component on the first current collector 6 for connecting the first tab 21 and the first current collector 6 .

The first connection section 61 extending between the multiple layers of the first tab 21 means that the first connection section 61 is inserted into the length direction of the end cover 3 , that is, inserted between the multiple layers of the first tab 21 in the Y direction. The first connection section 61 extends between the multiple layers of the first tab 21 , the first connection section 61 divides the tab into two parts, and the first connection section 61 is clamped by the two parts of the tab.

By extending the first connection section 61 between the layers of the first tab 21, there are tabs on both sides of the first connection section 61. In the case of one side, the number of lug layers that need to be penetrated on one side of the first connecting section 61 during the welding process is reduced, reducing the possibility of false welding and improving the reliability of the battery cell A.

Referring to FIG. 5 , in some embodiments, the difference in the number of layers of the first tab 21 on both sides of the first connecting section 61 is less than six.

The first side of the two sides is divided by the first connecting section 61 and faces the side in the positive X direction, and the second side is divided by the first connecting section 61 and faces the side in the negative X direction.

The difference in the number of layers is the difference between the number of tab layers on the first side of the first connecting section 61 and the number of tab layers on the second side of the first connecting section 61 .

In some embodiments, the difference in the number of layers of the first tab 21 on both sides of the first connecting segment 61 may be 5, 4, 3, 2 or 1.

In some embodiments, the difference between the number of layers of the first lug 21 on both sides of the first connecting segment 61 is zero, so that the number of layers of the first tab on the first side of the first connecting segment 61 is equal to that on the second side of the first connecting segment 61 The number of ear layers.

By setting the difference in the number of layers of the first tabs 21 on both sides of the first connection section 61 to be less than 6, the difference in the number of layers of the first tabs 21 on both sides of the first connection section 61 during welding is not much different, and the welding time is almost same. This avoids the situation that the number of layers of the first tab 21 on one side is much smaller than that on the other side, resulting in the problem that the first tab 21 on the side with fewer layers is welded through during welding.

Referring to FIG. 3 to FIG. 4 , in some embodiments, the first current collector 6 further includes a second connecting segment 62 and a third connecting segment 63 that are bent to each other, and the third connecting segment 63 is disposed between the electrode assembly 2 and the Between the end caps 3 and connected to the first electrode terminal 4, the first tab 21 is disposed toward the inner wall 12 of the housing 1, and the second connecting section 62 is disposed between the first tab 21 and the inner wall 12 of the housing 1 and connected to the second A connection section 61 and a third connection section 63 , the second connection section 62 is perpendicular to the first direction Y, which is the direction in which the first tab 21 is led out from the electrode assembly 2 .

Mutual bending means that the second connecting section 62 can be bent at a certain angle with the third connecting section 63 , preferably perpendicularly. Here, vertical refers to an approximate vertical state, rather than a definition of absolute vertical in the strict sense.

The inner wall 12 is a shell wall facing the shell 1 along the extending direction of the first tab 21 .

The first direction Y refers to the arrangement direction of the body part and the first tab 21. The body part is the area where the electrode assembly 2 is provided with an active material layer (not shown in the figure), and the electrode assembly 2 is a region coated with an active material layer. The region forms a first tab 21, and the first tab 21 is led out from the main body.

By setting the third connection section 63 to connect with the first electrode terminal 4, the second connection section 62 connects the first connection section 61 and the third connection section 63, so that the electric energy generated by the electrode assembly 2 is guided to the battery through the first connection section 61 Exterior of Monomer A.

Referring to FIG. 3 to FIG. 4 , in some embodiments, the first connecting segment 61 protrudes from the surface of the second connecting segment 62 facing the first tab 21 .

The protrusion of the first connecting section 61 means that the first connecting section 61 has a raised structure on the second connecting section 62 , and the structure may be a cuboid, a cube or a cylinder, which is not further limited here.

By arranging the first connecting section 61 to protrude from the surface of the second connecting section 62 facing the first tab 21 , the first connecting section 61 can have a structure that can extend into the layers of the first tab 21 .

Please refer to FIG. 3 to FIG. 4 , in some embodiments, the first connecting section 61 and the second connecting section 62 are integrally formed.

The connection method of the first connection section 61 and the second connection section 62 may be an integral molding method such as integral injection molding or stamping.

The integral formation of the first connecting section 61 and the second connecting section 62 can simplify the manufacturing process of the first connecting section 61 and the second connecting section 62 and also enhance the connection strength between the first connecting section 61 and the second connecting section 62 .

In some embodiments, the first connection section 61 and the second connection section 62 are separately connected, and the separate connection may be welding or riveting, which is not further limited here.

Referring to FIG. 5 , in some embodiments, the first tab 21 is wound and arranged in multiple layers, and the first connecting section 61 is located at the winding center 212 of the first tab 21 .

The first pole piece, the second pole piece and the diaphragm are wound to form the electrode assembly 2, the electrode assembly 2 includes the first tab 21 of the multi-layer structure formed by winding, and the relative center with a gap after winding is the winding center 212.

By setting the first connecting section 61 at the winding center 212 of the first tab 21, the winding center 212 has more clearance space relative to other positions of the first tab 21, and this space can make the first connecting section 61 more spaced. It is easy to insert into the first tab 21, improving assembly efficiency.

Referring to FIG. 5 , in some embodiments, the first connecting section 61 is spaced apart from the corner 211 of the first tab 21 .

The corner 211 is the corner of two winding bends generated by the winding of the first tab 21 .

The spaced setting means that the first connecting section 61 and the corner 211 are set at a relative distance in the Z direction.

By setting the first connecting section 61 at a distance from the corner 211 , the risk of interference between the first connecting section 61 and the corner 211 is reduced and assembly efficiency is improved.

3 to 4, in some embodiments, the electrode assembly 2 further includes a second tab 22, and the second tab 22 is opposite in polarity to the first tab 21; the battery cell A also includes a second electrode terminal 5 and the second current collector 7, the second current collector 7 includes a bent terminal connection part 72 and a tab connection part 71, the terminal connection part 72 is arranged between the electrode assembly 2 and the end cover 3 and connected to the second The electrode terminals 5 are connected, and the tab connecting portion 71 extends from the terminal connecting portion 72 toward the bottom wall of the housing 1 and connects to the second tab 22 . The first connecting section 61 and the tab connecting portion 71 are arranged perpendicular to each other.

The polarity of the second tab 22 is opposite to that of the first tab 21 , which means that when the first tab 21 is a positive tab, the second tab 22 is a negative tab. Or, when the first tab 21 is a negative tab, the second tab 22 is a positive tab.

The second electrode terminal 5 may be a positive electrode terminal or a negative electrode terminal, corresponding to the polarity of the second tab 22 . For example, when the second tab 22 is a negative tab, the second electrode terminal 5 is a negative electrode terminal.

The second current collector 7 connects the second electrode terminal 5 and the second tab 22 , and the second current collector 7 can guide electric energy from the electrode assembly 2 to the outside of the battery cell A.

The terminal connecting portion 72 connects the second electrode terminal 5 and the tab connecting portion 71 .

Interval setting means that in the Y direction, the second current collecting piece 7 is spaced from the first current collecting piece 6 .

The tab connection part 71 is used to connect with the second tab 22 .

Being perpendicular to each other means that the projection of the first connecting section 61 in the Y direction and the projection of the tab connecting portion 71 in the Y direction are perpendicular to each other.

The second electrode terminal 5 is connected to the second tab 22 by setting the second current collector 7 , so that electric energy is guided to the outside of the battery cell A through the second electrode terminal 5 . By arranging the first connection section and the 61 tab connection part 71 perpendicular to each other, the assembly of the battery cell A can be better achieved without wasting the internal space of the battery cell A, and also avoiding interference with other components that may lead to reliability question.

Referring to FIG. 3 to FIG. 4 , in some embodiments, the material of the first current collector 6 includes aluminum or aluminum alloy.

When aluminum or aluminum alloy is used as the material of the first current collecting piece 6, the first current collecting piece 6 is made of the same material as the first tab 21, which is more conducive to realizing the welding of the first current collecting piece 6 and the first tab 21 .

In a second aspect, the embodiment of the present application provides a battery 100 , and the battery 100 includes a battery cell A.

The battery 100 using the battery cell A reduces the possibility of false welding and improves the reliability of the battery 100 .

In a third aspect, the embodiment of the present application provides an electric device, and the electric device includes a battery unit A.

The electrical equipment using the battery cell A reduces the possibility of false welding and improves the reliability of the electrical equipment.

In the fourth aspect, please refer to FIG. 6 , the embodiment of the present application provides a welding device, the welding device includes a first welding head 81 and a second welding head 82, and both the first welding head 81 and the second welding head 82 are provided with ultrasonic emission The device 83, the first welding head 81 and the second welding head 82 are used for welding the parts to be welded.

In some embodiments, the first welding head 81 and the second welding head 82 can be set on the same side, and can also be set on the opposite side; when the first welding head 81 and the second welding head 82 are set on the same side, the first The other side corresponding to the welding head 81 and the second welding head 82 is a welding seat.

In some embodiments, please refer to FIG. 6 , the first welding head 81 and the second welding head 82 are arranged on opposite sides, and the workpiece to be welded is placed in the middle of the first welding head 81 and the second welding head 82 .

By setting the welding equipment with two welding heads, the two welding heads can be used to weld the welded parts at the same time. Using this welding equipment to weld the battery cell A can improve the welding efficiency, reduce the possibility of false welding, and improve the reliability of the battery cell A. sex.

According to some embodiments of the fourth aspect of the present application, the first welding head 81 and the second welding head 82 are respectively arranged on both sides of the piece to be welded, and the piece to be welded includes the first connecting section 61 of the first current collector 6 and the The multi-layer first tabs 21 of the electrode assembly 2 , the first connecting section 6 is located between the multi-layer first tabs 21 .

By setting the first welding head 81 and the second welding head 82 respectively located on both sides of the first connecting section 61 and the multi-layer first tab 21, the parts on both sides of the first connecting section 61 that need to be welded by each welding head The number of layers of the first tab 21 is reduced, which can improve the welding efficiency, reduce the possibility of false welding, and improve the reliability of the battery cell A.

The embodiment of the present application provides a battery cell A. Please refer to FIGS. The casing 1 is formed with an opening 11, the electrode assembly 2 is located in the casing 1, the electrode assembly 2 includes a first tab 21, and the first tab 21 is provided with multiple layers; the end cover 3 covers the opening 11; the first electrode terminal 4 is provided In the end cover 3, the first current collector 6 is used to connect the first tab 21 and the first electrode terminal 4, the first current collector 6 includes a first connecting section 61, and the first connecting section 61 extends into the first tab 21 between multiple layers and connected to the first tab 21, so that there are tabs on both sides of the first connecting section 61. Compared with the situation where the multi-layer first tabs 21 are all on one side of the first connecting section 61, The number of tab layers that need to be penetrated during the welding process is reduced, reducing the possibility of false welding, and improving the reliability of the battery cell A. Referring to FIG. 5 , the number of layers of tabs on both sides of the first connecting section 61 is the same, so that the welding time on both sides of the first connecting section 61 is almost the same. The first current collector 6 also includes a second connecting section 62 and a third connecting section 63 which are bent and arranged on each other. The third connecting section 63 is arranged between the electrode assembly 2 and the end cap 3 and is connected to the first electrode terminal 4 . The first tab 21 is arranged towards the inner wall 12 of the housing 1, the second connecting section 62 is arranged between the first tab 21 and the inner wall 12 of the housing 1 and connects the first connecting section 61 and the third connecting section 63, and the second connecting section 62 Segment 62 is perpendicular to the first direction Y. The second connection section 62 connects the first connection section 61 and the fifth third connection section 63 , so that the electric energy generated by the electrode assembly 2 is guided to the outside of the battery cell A through the first connection section 61 . Please refer to FIG. 3 to FIG. 4 , in some embodiments, the first connecting section 61 and the second connecting section 62 are integrally formed. The integral molding can simplify the manufacturing process of the first connection section 61 and the second connection section 62 , and also enhance the connection strength between the first connection section 61 and the second connection section 62 . See Figure 5 again,

In some embodiments, the first tab 21 is wound and arranged in multiple layers, and the first connecting segment 61 is located at the winding center 212 of the first tab 0 21 . The first connecting section 61 is spaced apart from the corner 211 of the first tab 21 . roll

There are more clearance spaces around the center 212 relative to other positions of the first tab 21 , which can make it easier for the first connecting segment 61 to be inserted into the first tab 21 , improving assembly efficiency. The first connection section 61 is spaced apart from the corner 211 , thereby reducing the risk of interference between the first connection section 61 and the corner 211 , and improving assembly efficiency.

5 Please refer to Fig. 3 to Fig. 4 again, the electrode assembly 2 also includes a second tab 22, and the second tab 22 is opposite in polarity to the first tab 21; the battery cell A also includes a second electrode terminal 5 and a second The current collector 7, the second current collector 7 includes a bent terminal connection part 72 and a tab connection part 71, the terminal connection part 72 is arranged between the electrode assembly 2 and the end cover 3 and connected to the second electrode terminal 5 , the tab connection part 71 is connected by the terminal

The connecting portion 72 extends toward the bottom wall of the housing 1 and connects to the second tab 22 , and the first connecting section 61 and the tab connecting portion 71 are arranged perpendicularly to each other. The second current collector 7 connects the second electrode terminal 5 and the second tab 22, so that

Electric energy is guided to the outside of the battery cell A through the second electrode terminal 5 . The first connection section and the 61 lug connection portion 71 are arranged perpendicular to each other, which can better realize the assembly of the battery cell A without wasting the internal space of the battery cell A, and avoid interference with other components and cause reliability problems. Material of the first current collector 6

Aluminum or aluminum alloy. The first tab 21 is a positive tab, and the material of the positive tab is aluminum. When aluminum is used as the material of the first current collector 5, the material of the first current collector 6 is the same as that of the first tab 21, which is more conducive to realizing the first current collector. Welding of a current collector 6 and the first tab 21 .

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 (13)

1. A battery cell, characterized in that it comprises: a housing formed with an opening; An electrode assembly, located in the casing, the electrode assembly includes a first tab, and the first tab is provided with multiple layers; an end cap covering the opening; a first electrode terminal disposed on the end cap; and a first current collector, used to connect the first tab and the first electrode terminal; Wherein, the first current collector includes a first connection section, and the first connection section extends between multiple layers of the first tabs and is connected to the first tabs. 2 . The battery cell according to claim 1 , wherein the difference in the number of layers of the first tabs on both sides of the first connecting section is less than 6. 3 . 3. The battery cell according to claim 1, wherein the first current collector further comprises a second connecting section and a third connecting section which are bent to each other, and the third connecting section is arranged on the Between the electrode assembly and the end cover and connected to the first electrode terminal, the first tab is set toward the inner wall of the housing, and the second connecting section is set between the first tab and the Between the inner wall of the housing and connect the first connecting section and the third connecting section, the second connecting section is perpendicular to the first direction, the first direction is that the first tab is connected by the electrode The direction in which the component is exported. 4 . The battery cell according to claim 3 , wherein the first connection section protrudes from a surface of the second connection section facing the first tab. 5 . The battery cell according to claim 3 , wherein the first connection section and the second connection section are integrally formed. 6 . The battery cell according to claim 1 , wherein the first tab is wound in multiple layers, and the first connection section is located at the winding center of the first tab. 7 . The battery cell according to claim 6 , wherein the first connecting section is spaced apart from the corner of the first tab. 8 . 8. The battery cell according to any one of claims 1-7, wherein the electrode assembly further comprises a second tab, the polarity of which is opposite to that of the first tab; The battery cell also includes a second electrode terminal and a second current collector, the second current collector includes a bent terminal connection portion and a tab connection portion, the terminal connection portion is disposed on the electrode assembly Between the end cover and the second electrode terminal, the tab connection part extends from the terminal connection part toward the bottom wall of the housing and connects to the second tab. A connecting segment and the tab connecting portion are arranged perpendicularly to each other. 9. The battery cell according to any one of claims 1-7, wherein the material of the first current collector includes aluminum or aluminum alloy. 10. A battery, comprising the battery cell according to any one of claims 1-9. 11. An electrical device, comprising the battery cell according to any one of claims 1-9. 12. A welding device, characterized in that it comprises a first welding head and a second welding head, the first welding head and the second welding head are all provided with ultrasonic transmitters, the first welding head and the second welding head The second welding head is used for welding the parts to be welded. 13. The welding device according to claim 12, wherein the first welding head and the second welding head are respectively arranged on both sides of the piece to be welded, and the piece to be welded comprises a first current collector The first connection section of the electrode assembly and the multi-layer first tab of the electrode assembly, the first connection section is located between the multi-layer first tabs.

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