CN217768702U - Battery cell, battery and power consumption device - Google Patents

Abstract

The present application discloses a battery cell, a battery and an electrical device. The battery cell of the embodiment of the present application includes: a casing including a first wall; an electrode assembly accommodated in the casing, the electrode assembly including a flat region and a corner region disposed between the flat region and the first wall; and an insulating member , including an insulating body and an insulating protrusion, along the thickness direction of the first wall, the insulating body is located between the corner area and the first wall, and the insulating protrusion extends from the insulating body along the direction away from the first wall and protrudes out of the insulating body, The protruding size of the insulating protrusion relative to the insulating body is smaller than the size of the corner region in the thickness direction of the first wall. In the technical solutions of the embodiments of the present application, the protruding size of the insulating protrusion relative to the insulating body is smaller than the size of the corner region in the direction of the first wall thickness, which provides space for the expansion and deformation of the electrode assembly and reduces the extrusion of the electrode assembly on the insulating member. The compressive strength ensures the structural stability of the insulating parts and improves the safety performance of the battery.

Description

Battery cells, batteries and electrical devices

technical field

The present application relates to the field of batteries, in particular to a battery cell, a battery and an electrical device.

Background technique

Battery cells are widely used in electronic equipment, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc. The battery cells may include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, secondary alkaline zinc-manganese battery cells, and the like.

In the development of battery technology, how to improve the safety performance of battery cells and ensure the stability and safety of battery cells is also one of the research focuses in this field.

Utility model content

In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can improve the operation stability and safety of the battery cell.

In a first aspect, the present application provides a battery cell, including:

an enclosure including a first wall;

An electrode assembly housed in the casing, the electrode assembly includes a flat area and a corner area disposed between the flat area and the first wall; and

The insulator includes an insulating body and an insulating protrusion. Along the thickness direction of the first wall, the insulating body is located between the corner area and the first wall. The insulating protrusion extends from the insulating body in a direction away from the first wall and protrudes out of the insulating body. In the main body, the size of the insulating protrusion protruding relative to the insulating body is smaller than the size of the corner area in the thickness direction of the first wall.

In the technical solution of the embodiment of the present application, the size of the insulating protrusion protruding relative to the insulating body is smaller than the size of the corner area in the thickness direction of the first wall, so as to provide space for the expansion and deformation of the electrode assembly and reduce the extrusion of the electrode assembly to the insulating part. The compressive strength ensures the structural stability of the insulator and improves the safety performance of the battery.

In some embodiments, the straight region and the corner region are arranged along the first direction, and the electrode assembly further includes a tab, and the tab is led out from the end of the straight region along the second direction. When the electrode assembly arranged in the above manner is deformed, enough space can be provided to prevent extrusion between the electrode assembly and the insulator.

In some embodiments, the chamfering radius of the corner area is R, the dimension of the insulating protrusion protruding from the insulating body is H, and R and H satisfy the relationship: 1.8≤2R/H≤20. By setting a reasonable chamfer radius of the corner area and the protrusion size of the insulating protrusion, controlling the number of coils of the electrode assembly and the thickness of the insulating protrusion can ensure that the electrode assembly has sufficient deformation space and further ensure the structural integrity of the insulating part sex.

In some embodiments, there are multiple electrode assemblies, and the multiple electrode assemblies are arranged along the third direction. The plurality of electrode assemblies are arranged along the third direction, which can ensure a deformation space between the plurality of electrode assemblies and the insulating protrusions, ensure the stability of the operation of the electrode assemblies, and improve the safety performance of the battery cell.

In some embodiments, the number of electrode assemblies is denoted as n, and n, R and H satisfy the relationship: 1.8≤2nR/H≤20. By setting the reasonable number of electrode assemblies, the radius of the chamfer of the electrode assemblies and the thickness of the insulating protrusions, it is possible to ensure that each electrode assembly has sufficient deformation space and ensure the stability of the operation of the electrode assemblies.

In some embodiments, the minimum thickness of the insulating protrusion along the third direction is P, and P, n and R satisfy the relationship: 6≤2nR/P≤80. By setting a reasonable thickness of the insulating protrusions, sufficient space is provided for the deformation of the electrode assembly in the third direction, and at the same time, the structural strength of the insulating protrusions itself is ensured, and the arrangement position and insulation performance of the insulating parts are ensured.

In some embodiments, the minimum distance Q between two adjacent electrode assemblies, the extension length of the insulating body along the third direction is W, the thickness of each electrode assembly along the third direction is T, W, T, n And Q satisfies the relationship: 0.1≤|W–nT–(n–1)Q|≤1. By setting the distance between the two electrode assemblies within a reasonable range, the distance between the electrode assembly and the insulating protrusion in the third direction is ensured to provide enough space for deformation of the electrode assembly.

In some embodiments, the battery cell further includes a protective layer disposed between the electrode assembly and the case and surrounding the electrode assembly. By providing a protective layer, the probability of damage caused by friction during the installation of the electrode assembly is reduced, and the integrity of the electrode assembly is improved.

In some embodiments, the protective layer is connected to the insulating bump. The above scheme has a simple structure and is easy to operate.

In some embodiments, a plurality of thermal melting points distributed at intervals are provided on the insulating protrusion, and the protective layer and the insulating protrusion are connected through the plurality of thermal melting points. The insulation protrusion is connected to the protective layer through the thermal melting point, which improves the connection efficiency of the protective layer while ensuring the stability of the connection.

In some embodiments, the battery cell further includes an adapter, the adapter includes a lug connecting portion extending along the first direction and a pole connecting portion extending along the second direction, at least part of the pole connecting portion is disposed on Between the insulating body and the corner area, the pole connecting portion is arranged between two opposite insulating protrusions, and the pole lug connecting portion is connected to the pole lug. In the above-mentioned technical solution, by arranging a plurality of adapters, the current of the electrode assembly is connected to the end cap, and at the same time, the adapter is arranged between the two insulating protrusions, and the insulating protrusions can be used for positioning , reducing the space it occupies.

In some embodiments, the surface of the insulating body facing the electrode assembly has a receiving groove, the pole connecting portion is disposed in the receiving groove, and the corner area abuts against the pole connecting portion. By providing the receiving groove, the protruding size of the connecting part of the pole along the surface of the insulating body is reduced, and the smoothness of the connection between the corner area and the insulating body is improved.

In some embodiments, a pressure relief mechanism is provided on the first wall, and there are two insulating pieces, and the two insulating pieces are disposed on opposite sides of the pressure relief mechanism. The insulator is provided according to the number of tabs, which can respectively insulate the current of the positive tab and the negative tab, thereby improving safety performance.

In a second aspect, the present application also provides a battery, including the battery cell in the above embodiment.

In a third aspect, the present application further provides an electric device, the electric device includes the battery in the above embodiment, and the battery is used to provide electric energy.

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable , the following specifically cites the specific implementation manner of the present application.

Description of drawings

The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

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

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

Fig. 3 is an explosion schematic diagram of a battery cell in a battery provided by some embodiments of the present application;

Fig. 4 is a schematic structural diagram of a battery cell provided by some embodiments of the present application;

Fig. 5 is the sectional view of A-A section among Fig. 4;

Fig. 6 is a schematic structural diagram of an electrode assembly provided by some embodiments of the present application;

Fig. 7 is the enlarged schematic diagram of circle C in Fig. 5;

Fig. 8 is a schematic structural diagram of a battery cell provided by another embodiment of the present application;

Fig. 9 is the sectional view of B-B section among Fig. 8;

Fig. 10 is an enlarged schematic diagram of circle D in Fig. 9;

Fig. 11 is a schematic structural diagram of a protective layer provided by some embodiments of the present application;

Fig. 12 is a schematic structural diagram of an adapter provided by some embodiments of the present application.

In the drawings, the drawings are not necessarily drawn to scale.

Explanation of reference signs:

1. Vehicle; 2. Battery; 24. Pressure relief mechanism; 25. Electrode terminal; 3. Controller; 4. Motor; 5. Box; 51. First part; 52. Second part; 53. Accommodating space; 6 , battery module; 7, battery cell; 10, electrode unit; 12, tab; X, first direction; Y, second direction; Z, third direction; 22, end cover assembly; 23, shell;

11. Electrode assembly; 1101, flat area; 1102, corner area; 1103, protective layer; 1104, thermal melting point;

20. Shell; 201. First wall; 202. Adapter; 2021. Tab connection; 2022. Pole connection;

21. Opening; 30. Insulation piece; 301. Insulation body; 302. Insulation protrusion.

Detailed ways

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

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

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

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

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

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

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

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

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

The battery cell includes an electrode unit and an electrolyte, the electrode unit includes at least one electrode assembly, and the electrode assembly includes a positive pole piece, a negative pole piece and a separator. A battery cell works primarily by moving metal ions between the positive and negative pole pieces. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collector and a positive electrode protrusion protruding from the positive electrode current collector, and the positive electrode current collector part is coated with a positive electrode active material layer, at least part of the positive electrode convex part is not coated with a positive electrode active material layer, and the positive electrode convex part is used as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, the positive electrode active material layer includes the positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector and a negative electrode protrusion protruding from the negative electrode current collector. part is coated with a negative electrode active material layer, at least part of the negative electrode convex part is not coated with a negative electrode active material layer, and the negative electrode convex part is used as a negative electrode tab. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes the negative electrode active material, and the negative electrode active material may be carbon or silicon. In order to ensure that a large current is passed without fusing, the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together. The material of the spacer can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, which is not limited in the embodiment of the present application.

The technical solutions described in the embodiments of the present application are applicable to the battery 2 and the electric device using the battery 2 . Electric devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and electric tools, and so on. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more. The embodiments of the present application do not impose special limitations on the above-mentioned electrical devices.

In the following embodiments, for the convenience of description, the electric device is taken as an example for description.

Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application. As shown in FIG. 1 , a battery 2 is arranged inside the vehicle 1 , and the battery 2 can be arranged at the bottom, head or tail of the vehicle 1 . The battery 2 can be used for power supply of the vehicle 1 , for example, the battery 2 can be used as an operating power source of the vehicle 1 .

The vehicle 1 may also include a controller 3 and a motor 4 , the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

In some embodiments of the present application, the battery 2 can not only be used as an operating power source for the vehicle 1 , but can also be used as a driving power source for the vehicle 1 to provide driving power for the vehicle 1 instead of or partially replacing fuel oil or natural gas.

Fig. 2 is a schematic exploded view of a battery 2 provided by some embodiments of the present application. As shown in FIG. 2 , the battery 2 includes a box body 5 and a battery module 6 , a plurality of battery cells form the battery module 6 , and the battery module 6 is housed in the box body 5 .

The box body 5 is used to accommodate the battery cells, and the box body 5 may have various structures. In some embodiments, the box body 5 may include a first part 51 and a second part 52, the first part 51 and the second part 52 cover each other, and the first part 51 and the second part 52 jointly define a cavity for accommodating the battery cells. Accommodating space 53 . The second part 52 can be a hollow structure with an open end, the first part 51 is a plate-like structure, and the first part 51 covers the opening side of the second part 52 to form a box body 5 with an accommodation space 53; the first part 51 and the second part The two parts 52 can also be hollow structures with one side open, and the open side of the first part 51 covers the open side of the second part 52 to form the box body 5 with the receiving space 53 . Of course, the first part 51 and the second part 52 can be in various shapes, such as cylinder, cuboid and so on.

In order to improve the sealing performance after the first part 51 and the second part 52 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first part 51 and the second part 52 .

Assuming that the first part 51 covers the top of the second part 52 , the first part 51 can also be called the upper box cover, and the second part 52 can also be called the lower box body.

In the battery 2, there may be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel or in parallel. The hybrid connection means that there are both series and parallel connections among the multiple battery cells. A plurality of battery cells can be directly connected in series or in parallel or mixed together, and then the whole composed of a plurality of battery cells is accommodated in the box 5; of course, it is also possible to first connect a plurality of battery cells in series or parallel or The battery modules 6 are formed by parallel connection, and multiple battery modules 6 are connected in series or in parallel or in series to form a whole, and are housed in the box body 5 .

FIG. 3 is a schematic exploded view of a battery cell 7 in a battery provided by some embodiments of the present application. In some embodiments, there are multiple battery cells 7 , and the multiple battery cells 7 are connected in series, in parallel or in parallel to form the battery module 6 . A plurality of battery modules 6 are connected in series, in parallel or in parallel to form a whole, and accommodated in the box.

The plurality of battery cells 7 in the battery module 6 can be electrically connected through a confluence component, so as to realize parallel connection, series connection or mixed connection of the plurality of battery cells 7 in the battery module 6 .

The battery cell 7 of the embodiment of the present application includes an electrode unit 10 and a casing 20 . The housing 20 includes a housing 23 and an end cap assembly 22 . The housing 23 has an opening 21 , the electrode unit 10 is accommodated in the housing 23 , and the end cover assembly 22 is used to connect the housing 23 and cover the opening 21 .

The electrode unit 10 includes at least one electrode assembly 11 . Exemplarily, the electrode unit 10 in FIG. 3 includes two electrode assemblies 11 . The electrode assembly 11 includes a positive pole piece, a negative pole piece and a separator. The electrode assembly 11 may be a wound electrode assembly, a laminated electrode assembly or other forms of electrode assemblies.

In some embodiments, the electrode assembly 11 is a wound electrode assembly. The positive pole piece, the negative pole piece and the separator are all strip-shaped structures. In the embodiment of the present application, the positive pole piece, the separator, and the negative pole piece can be stacked in sequence and wound more than two times to form the electrode assembly 11 .

In other embodiments, the electrode assembly 11 is a laminated electrode assembly. Specifically, the electrode assembly 11 includes a plurality of positive electrode sheets and a plurality of negative electrode sheets, the positive electrode sheets and the negative electrode sheets are alternately stacked, and the stacking direction is parallel to the thickness direction of the positive electrode sheet and the thickness direction of the negative electrode sheet.

The electrode unit 10 includes at least one electrode assembly 11 . That is to say, in the battery cell 7 , there may be one electrode assembly 11 housed in the casing 23 or a plurality of them.

The housing 23 is a hollow structure with one side open. The end cover assembly 22 covers the opening of the housing 23 and forms a sealed connection to form a housing chamber for housing the electrode unit 10 and the electrolyte.

The housing 23 can be in various shapes, such as cylinder, cuboid and so on. The shape of the casing 23 can be determined according to the specific shape of the electrode unit 10 . For example, if the electrode unit 10 has a cylindrical structure, a cylindrical shell can be selected; if the electrode unit 10 has a rectangular parallelepiped structure, a rectangular parallelepiped shell can be selected. Of course, the end cover assembly 22 can also be of various structures, for example, a plate-like structure or a hollow structure with one end open. Exemplarily, the housing 23 is a cuboid structure, the end cover assembly 22 is a plate structure, and the end cover assembly 22 covers the opening at the top of the housing 23 .

The end cap assembly 22 also includes an electrode terminal 25 . In some embodiments, there are two electrode terminals 25, and the two electrode terminals 25 are respectively defined as a positive electrode terminal and a negative electrode terminal. The positive electrode terminal and the negative electrode terminal are respectively used for electrical connection with the positive ear and the negative ear of the electrode assembly 11 to output the current generated by the electrode assembly 11 .

The end cover assembly 22 also includes a pressure relief mechanism 24 for releasing the internal pressure or temperature of the battery cell 7 when the internal pressure or temperature of the battery cell 7 reaches a predetermined value. Exemplarily, the pressure relief mechanism 24 is located between the positive electrode terminal and the negative electrode terminal, and the pressure relief mechanism 24 may be a component such as an explosion-proof valve, a burst disk, a gas valve, a pressure relief valve, or a safety valve.

In some embodiments, the housing 23 can also be a hollow structure with openings on opposite sides. The end cap assembly 22 includes two end cap assemblies 22, and the two end cap assemblies 22 respectively cover two openings of the casing 23 and are sealingly connected to form an accommodating cavity for accommodating the electrode unit 10 and the electrolyte. In some examples, the positive electrode terminal and the negative electrode terminal may be mounted on the same end cap assembly 22 . In some other examples, the positive electrode terminal and the negative electrode terminal are installed on the two end cap assemblies 22 respectively.

In the battery cell, the electrode assembly is arranged in the casing, and the side of the end cap assembly of the casing facing the electrode assembly can usually be provided with an insulating member to prevent short circuit caused by contact between the end cap assembly and the electrode assembly. Two side edges of the insulator are provided with insulating protrusions extending toward the direction of the electrode assembly, which are used to limit the relative movement between the insulator and the end cap assembly and ensure the insulating effect of the insulator. During the use of the battery, the electrode assembly will expand and deform. When the electrode assembly deforms beyond a certain range along the width direction, it will squeeze the insulating protrusions on the insulator and push the two opposite insulating protrusions away from each other. Direction movement may eventually lead to breakage of insulating parts, resulting in short circuit, and even explosion, fire and other safety accidents, and the safety performance of battery cells will be reduced. On the other hand, the deformation of the electrode assembly will lead to deformation of the shell, and there will be gaps inside the shell, so that the electrolyte cannot completely infiltrate the corner area of the electrode assembly, resulting in faster lithium decomposition in the corner area and reduced battery cycle life.

In order to prevent the above situation from happening, improve the safety of the battery cell operation process and prolong the cycle life of the battery, the inventor has designed a battery cell, including an insulator. The insulator includes an insulating body and an insulating protrusion. In the thickness direction of the cover, the insulating body is located between the corner area and the end cover. The insulating protrusion extends from the insulating body in a direction away from the end cover and protrudes out of the insulating body. The size of the insulating protrusion protruding relative to the insulating body is smaller than that of the corner area Dimension in the thickness direction of the end cap.

In the technical solution of the embodiment of the present application, the size of the insulating protrusion protruding relative to the insulating body is smaller than the size of the corner area in the thickness direction of the end cap, so as to provide space for the expansion and deformation of the electrode assembly 11 and reduce the resistance of the electrode assembly 11 to the insulator. Extrusion strength ensures the structural stability of the insulating part and improves the safety performance of the battery. Specific embodiments of the battery cells in this application will be described in detail below.

Please continue to refer to Figures 4 to 10, Figure 4 is a schematic structural view of the battery cell 7 provided by some embodiments of the present application; Figure 5 is a cross-sectional view of the A-A section in Figure 4; Figure 6 is an electrode assembly provided by some embodiments of the present application 11 is a schematic structural diagram; FIG. 7 is an enlarged schematic diagram of the circle frame C in FIG. 5; FIG. 8 is a schematic structural diagram of a battery cell 7 provided by another embodiment of the present application; FIG. 9 is a cross-sectional view of the B-B section in FIG. 8; FIG. 10 It is an enlarged schematic diagram of circle D in FIG. 9 .

As shown in FIG. 4 and FIG. 5 , the embodiment of the present application provides a battery cell 7 , including: a casing 20 , an electrode assembly 11 and an insulating member 30 . The housing 20 includes a first wall 201 . The electrode assembly 11 is accommodated in the case 20 . The electrode assembly 11 includes a straight region 1101 and a corner region 1102 disposed between the straight region 1101 and the first wall 201 . The insulator 30 includes an insulating body 301 and an insulating protrusion 302. Along the thickness direction of the first wall 201, the insulating body 301 is located between the corner area 1102 and the first wall 201. The insulating protrusion 302 is away from the insulating body 301 along the first wall. The direction of the wall 201 extends and protrudes from the insulating body 301 , and the size of the insulating protrusion 302 protruding relative to the insulating body 301 is smaller than the size of the corner region 1102 in the thickness direction of the first wall 201 .

Specifically, the housing 20 includes a first wall 201 and a casing, and the casing has an opening. The casing may also include two opposite first side walls, a bottom wall and two opposite second side walls. The bottom wall is opposite to the first wall 201 . The above-mentioned housing 20 may form a structure similar to a cuboid. The first wall 201 may be an end cap. The first wall 201 covers the opening and is sealingly connected with the housing to form an accommodating chamber for accommodating the electrode assembly 11 . The casing and the first wall 201 can be made of metal materials to ensure the structural shape of the casing 20 to form protection for the electrode assembly 11 .

The electrode assembly 11 generally includes a pole piece and a separator. The electrode assembly 11 in the embodiment of the present application is formed by winding the stacked pole pieces and the separator along a certain winding direction. The winding direction can be clockwise or counterclockwise. The electrode assembly 11 also includes another corner region 1102 . The two corner regions 1102 are oppositely disposed on two sides of the straight region 1101 .

In some embodiments, the insulating member 30 is generally made of insulating materials with certain elasticity, such as rubber, silica gel, organic resin, and the like. The insulating body 301 can be configured as a strip structure, and one side of the insulating body 301 is bonded to the first wall 201 . The arrangement of the insulating protrusions 302 can reduce the displacement of the insulating body 301 toward the electrode assembly 11 and ensure the insulating effect. And the two insulating protrusions 302 have the same structure and are arranged oppositely along the two sides of the insulating body 301 . The above-mentioned structure can ensure that the force on both sides of the insulating body 301 is balanced, the position of the insulating body 301 is relatively fixed, and the insulation effect is improved.

In the technical solution of the embodiment of the present application, the expansion deformation of the electrode assembly 11 is mainly carried out along the thickness direction. Therefore, the size of the insulating protrusion 302 protruding relative to the insulating body 301 is smaller than the size of the corner area 1102 in the thickness direction of the first wall 201, so as to provide space for the expansion and deformation of the electrode assembly 11 and reduce the extrusion of the electrode assembly 11 to the insulating member 30. The compressive strength ensures the structural stability of the insulator 30 and improves the safety performance of the battery 2 . At the same time, it is ensured that there is enough storage space for the electrolyte in the housing 20 to prevent the electrode pads in the corner area 1102 from being infiltrated by the electrolyte, and reduce the speed at which lithium is decomposed in the corner area 1102 .

In some embodiments of the present application, as shown in FIG. 5 and FIG. 6 , the straight region 1101 and the corner region 1102 are arranged along the first direction X, and the electrode assembly 11 further includes a tab 12, and the tab 12 extends from the straight region 1101 It is drawn out from the end along the second direction Y. The electrode assembly 11 arranged in the above manner can provide enough space for the deformation of the electrode assembly 11 in the thickness direction and prevent the extrusion between the electrode assembly 11 and the insulator 30 .

In some embodiments of the present application, as shown in FIG. 7 , the chamfering radius of the corner region 1102 is R, and the size of the insulating protrusion 302 protruding from the insulating body 301 is H, and R and H satisfy the relationship: 1.8≤2R/ H≤20. By setting a reasonable chamfering radius R of the corner area 1102 and the protrusion size H of the insulating protrusion 302, controlling the number of coils of the electrode assembly 11 and the thickness of the insulating protrusion 302 can ensure that the electrode assembly 11 has sufficient deformation space, The structural integrity of the insulating member 30 and the safety performance of the battery cell 7 are further ensured.

In some embodiments of the present application, as shown in FIG. 8 and FIG. 9 , the number of electrode assemblies 11 in each battery cell 7 is multiple, and the plurality of electrode assemblies 11 are arranged in the casing 20 along the third direction Z. middle. The plurality of electrode assemblies 11 are arranged along the third direction Z, which can ensure a deformation space between the plurality of electrode assemblies 11 and the insulating protrusion 302 , ensure the stability of the operation of the electrode assemblies 11 , and improve the safety performance of the battery cell 7 .

In some embodiments of the present application, the number of electrode assemblies 11 is denoted as n, and n, R and H satisfy the relationship: 1.8≤2nR/H≤20. Wherein, the shapes and structures of the plurality of electrode assemblies 11 are the same, and have equal chamfering radii R of the corner regions 1102 . There may be two or more than two, and the number of battery cells 7 in this exemplary embodiment is set to two. It can be understood that when the number n of electrode assemblies 11 is greater than two, the above calculation formula can also be applied.

By setting a reasonable number n of electrode assemblies 11, the radius R of the chamfer of the electrode assemblies 11, and the thickness H of the insulating protrusion 302, it is possible to ensure that each electrode assembly 11 has sufficient deformation space and ensure the stability of the operation of the electrode assembly 11 .

In some embodiments of the present application, as shown in FIG. 10 , the minimum thickness of the insulating protrusion 302 along the third direction Z is P, and P, n and R satisfy the relationship: 6≤2nR/P≤80. By setting a reasonable thickness of the insulating protrusion 302 , enough space is provided for the deformation of the electrode assembly 11 in the third direction Z, and at the same time, the structural strength of the insulating protrusion 302 itself is ensured, and the arrangement position and insulating performance of the insulating member 30 are ensured.

In some embodiments of the present application, as shown in FIG. 10 , the minimum distance Q between two adjacent electrode assemblies 11, the extension length of the insulating body 301 along the third direction Z is W, and each electrode assembly 11 The thickness along the third direction Z is T, and W, T, n and Q satisfy the relationship: 0.1≤|W–nT–(n–1)Q|≤1. By setting the distance between the two electrode assemblies 11 within a reasonable range, the distance between the electrode assembly 11 and the insulating protrusion 302 in the third direction Z is ensured to provide enough space for the deformation of the electrode assembly 11 .

In some embodiments of the present application, as shown in FIG. 11 , the battery cell 7 further includes a protective layer 1103 , and the protective layer 1103 is disposed between the electrode assembly 11 and the casing (not shown in the figure) and surrounds the electrode assembly 11 . The protective layer 1103 can be made of insulating material with hot-melt properties. The protection layer 1103 may be an organic film layer. The protective layer 1103 and the first wall 201 may be connected by bonding or hot-melt connection. By providing the protective layer 1103 , the probability of damage caused by friction during the installation process of the electrode assembly 11 is reduced, and the integrity of the electrode assembly 11 is improved.

In some embodiments of the present application, the protective layer 1103 is connected to the insulating protrusion 302 . Glue can be coated on the side of the protective layer 1103 facing the insulating member 30 to realize the connection between the protective layer 1103 and the insulating protrusion 302 . The above scheme has a simple structure and is easy to operate.

In some embodiments of the present application, the insulating protrusion 302 is provided with a plurality of thermal melting points 1104 distributed at intervals, and the protective layer 1103 and the insulating protrusion 302 are connected through the plurality of thermal melting points 1104 . The insulation protrusion 302 is connected to the protection layer 1103 through the thermal melting point 1104 , which improves the connection efficiency of the protection layer 1103 while enhancing the connection stability of the protection layer 1103 and the insulation protrusion 302 .

In some embodiments of the present application, as shown in FIG. 12 , the battery cell 7 further includes an adapter 202, and the adapter 202 includes a tab connection portion 2021 extending along the first direction X and a tab connecting portion 2021 extending along the second direction Y. The pole connecting portion 2022, at least part of the pole connecting portion 2022 is arranged between the insulating body 301 and the corner area (not shown in the figure), and the pole connecting portion 2022 is arranged between two oppositely disposed insulating protrusions 302 Between them, the tab connection part 2021 is connected to the tab (not shown). In the above technical solution, by setting a plurality of adapters 202 to connect the current of the electrode assembly and the end cap, and at the same time, setting the adapters 202 between the two insulating protrusions 302, it is possible to use the insulating protrusions 302 for positioning to reduce the space it occupies.

In some embodiments of the present application, the insulating body 301 has a receiving groove on the surface facing the electrode assembly 11 , the pole connecting portion 2022 is disposed in the receiving groove, and a part of the corner area 1102 abuts against the pole connecting portion 2022 . By providing the receiving groove, the protruding size of the pole connecting portion 2022 along the surface of the insulating body 301 is reduced, and the flatness of the connection between the corner area 1102 and the insulating body 301 is improved.

In some embodiments of the present application, the pressure relief mechanism 24 is provided on the first wall 201 , and the number of insulating members 30 is two, and the two insulating members 30 are disposed on opposite sides of the pressure relief mechanism 24 . The insulator 30 is provided according to the number of tabs 12 , which can respectively insulate the current of the positive tab 12 and the negative tab 12 , improving safety performance.

The embodiment of the present application also provides a battery 2, including the battery cell 7 in the above embodiment. The embodiment of the present application also provides an electric device, the electric device includes the battery 2 in the above embodiment, and the battery 2 is used to provide electric energy.

Since the above-mentioned battery 2 and the electric device include the battery cell 7 in the above embodiment, in the battery cell 7 in the embodiment of the present application, the size of the insulating protrusion 302 protruding from the insulating body 301 is smaller than the corner The size of the area 1102 in the thickness direction of the first wall 201 provides space for the expansion and deformation of the electrode assembly 11, reduces the extrusion strength of the electrode assembly 11 against the insulating member 30, ensures the structural stability of the insulating member 30, and improves the safety of the battery 2 performance. Therefore, both the battery 2 and the electric device provided in the embodiment of the present application can achieve the above technical effects.

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

Claims (15)

1. A battery cell, characterized in that it comprises: a housing (20) comprising a first wall (201); An electrode assembly (11), housed in the casing (20), the electrode assembly (11) comprising a straight region (1101) and a straight region (1101) and the first wall (201) between corner areas (1102); and The insulating member (30) includes an insulating body (301) and an insulating protrusion (302), and along the thickness direction of the first wall (201), the insulating body (301) is located between the corner area (1102) and the Between the first wall (201), the insulating protrusion (302) extends from the insulating body (301) in a direction away from the first wall (201) and protrudes from the insulating body (301) The size of the insulating protrusion (302) protruding relative to the insulating body (301) is smaller than the size of the corner region (1102) in the thickness direction of the first wall (201). 2. The battery cell according to claim 1, characterized in that, the straight region (1101) and the corner region (1102) are arranged along the first direction (X), and the electrode assembly (11) is also A tab (12) is included, and the tab (12) is led out from the end of the straight region (1101) along the second direction (Y). 3. The battery cell according to claim 1, characterized in that, the chamfering radius of the corner area (1102) is R, and the insulating protrusion (302) protrudes from the insulating body (301) The size is H, R and H satisfy the relationship: 1.8≤2R/H≤20. 4. The battery cell according to claim 1, characterized in that there are multiple electrode assemblies (11), and the plurality of electrode assemblies (11) are arranged along the third direction (Z). 5 . The battery cell according to claim 4 , wherein the number of the electrode assemblies ( 11 ) is denoted as n, and n, R and H satisfy the relationship: 1.8≤2nR/H≤20. 6. The battery cell according to claim 5, characterized in that, the minimum thickness of the insulating protrusion (302) along the third direction (Z) is P, and P, n and R satisfy the relationship: 6 ≤2nR/P≤80. 7. The battery cell according to claim 5, characterized in that, for the minimum distance Q between two adjacent electrode assemblies (11), the insulating body (301) is along the third direction ( The extension length on Z) is W, the thickness of each electrode assembly (11) along the third direction (Z) is T, and W, T, n and Q satisfy the relationship: 0.1≤|W–nT–( n–1)Q|≤1. 8. The battery cell according to any one of claims 1-7, characterized in that, the battery cell (7) further comprises a protective layer (1103), and the protective layer (1103) is provided on the The electrode assembly (11) is between the casing (20) and surrounds the electrode assembly (11). 9. The battery cell according to claim 8, characterized in that, the protective layer (1103) is connected to the insulating protrusion (302). 10. The battery cell according to claim 9, characterized in that, the insulating protrusion (302) is provided with a plurality of thermal melting points (1104) distributed at intervals, and the protective layer (1103) is insulated from the insulating The protrusions (302) are connected by a plurality of thermal melting points (1104). 11. The battery cell according to claim 2, characterized in that, the battery cell (7) further comprises an adapter (202), and the adapter (202) includes a direction along the first direction ( X) An extended tab connection portion (2021) and a pole connection portion (2022) extending along the second direction (Y), at least part of the pole connection portion (2022) is provided on the insulating body ( 301) and the corner area (1102), and the pole connecting portion (2022) is provided between two oppositely disposed insulating protrusions (302), the pole lug connecting portion (2021) Connect with the pole lug (12). 12. The battery cell according to claim 11, characterized in that, the surface of the insulating body (301) facing the electrode assembly (11) has a receiving groove, and the pole connecting portion (2022) is provided on the surface of the electrode assembly (11). The accommodating groove, the corner area (1102) abuts against the pole connecting portion (2022). 13. The battery cell according to any one of claims 1-7, 9-10, characterized in that a pressure relief mechanism (24) is provided on the first wall (201), and the insulating member ( 30) is two, and the two insulators (30) are oppositely arranged on both sides of the pressure relief mechanism (24). 14. A battery, characterized in that it comprises the battery cell (7) according to any one of claims 1-13. 15. An electric device, characterized in that the electric device comprises the battery (2) according to claim 14, and the battery (2) is used to provide electric energy.

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