CN117673672A

CN117673672A - Battery cell, battery and electricity utilization device

Info

Publication number: CN117673672A
Application number: CN202410132636.5A
Authority: CN
Inventors: 张琦; 谢媛媛
Original assignee: Jiangsu Contemporary Amperex Technology Ltd
Current assignee: Jiangsu Contemporary Amperex Technology Ltd
Priority date: 2024-01-31
Filing date: 2024-01-31
Publication date: 2024-03-08
Anticipated expiration: 2044-01-31
Also published as: CN117673672B

Abstract

The application provides a battery monomer, battery and power consumption device, the battery monomer includes: a housing having a receiving cavity; an electrode assembly disposed in the receiving chamber; and the insulating component is arranged between the shell and the electrode component, the insulating component comprises an insulating film and a buffer piece, the insulating film is used for insulating the electrode component and the shell, the buffer piece is connected with the insulating film and can support the electrode component, and the buffer piece is used for deforming along with expansion of the electrode component. The battery cell provided by the application can reduce the wrinkling probability of the electrode assembly.

Description

Battery cell, battery and electricity utilization device

Technical Field

The present disclosure relates to battery technology, and in particular, to a battery cell, a battery, and an electric device.

Background

The ion battery is used as a green energy source and is widely applied to the fields of electric vehicles, energy storage systems and the like. In the manufacturing process of the battery cell, in order to facilitate assembly and chemical reaction inside the battery cell, a certain space is provided between the electrode assembly of the battery cell and the case.

However, during the charge and discharge of the electrode assembly, the volume of the electrode assembly may be changed to cause wrinkling of the electrode assembly, affecting the reliability of the battery cell.

Disclosure of Invention

In view of the above, the present application provides a battery cell, a battery and an electric device, in which the probability of wrinkling of an electrode assembly in the battery cell is reduced, and the reliability of the battery cell is improved.

In a first aspect, embodiments of the present application provide a battery cell including a housing, an electrode assembly, and an insulating assembly. The housing has a receiving chamber in which the electrode assembly is disposed. The insulating assembly is arranged between the shell and the electrode assembly, the insulating assembly comprises an insulating film and a buffer piece, the insulating film is used for insulating the electrode assembly from the shell, the buffer piece is connected with the insulating film and can support the electrode assembly, the buffer piece is used for deforming along with expansion of the electrode assembly, the insulating film comprises a side wall and a bottom wall, and the buffer piece is located on at least part of the side wall.

The battery monomer that this embodiment provided is connected and can support electrode assembly's setting through the bolster with the insulating film, at first the bolster can play the effect of constraint to electrode assembly, in electrode assembly charging expansion's in-process, because the bolster to electrode assembly's constraint, can produce even restraining force to electrode assembly, make electrode assembly can even inflation when the inflation, reduce electrode assembly local bulge's phenomenon, reduce electrode assembly irregular uncontrollable expansion's probability, and further, because the constraint of bolster makes electrode assembly evenly expand in charging process, reduce electrode assembly local excessive expansion bulge's probability, so in electrode assembly discharging contraction process, can reduce electrode assembly because of local bulge and local wrinkling's probability when the shrink. In addition, because the volume of the electrode assembly can be increased in the continuous charge and discharge process, the buffer piece can be arranged along with the deformation of the electrode assembly in the expansion process, the expansion space of the electrode assembly is not extruded through the deformation of the buffer piece, and the expansion space of the electrode assembly can be yielded through the deformation of the buffer piece, and meanwhile, the expansion electrode assembly can be restrained, so that the problem of circulating water jump caused by overlarge internal stress of the electrode assembly is avoided. The side of the electrode assembly is easy to expand, the buffer piece is arranged on at least part of the side wall and can be adapted to the position where the electrode assembly is easy to expand, materials can be saved, and the buffer piece has good constraint effect.

In some embodiments, the cushioning member comprises a telescoping member, a valve. The telescopic piece is connected with the insulating film, and the telescopic piece encloses with the insulating film to form a cavity, and fluid is arranged in the cavity. The valve is arranged on the telescopic member, the valve comprises an opening state and a closing state, in the closing state, fluid is positioned in the cavity, the volume of the telescopic member is V1, in the opening state, the fluid in the cavity flows out, and the volume of the telescopic member is V2, wherein V2 is less than V1.

The battery monomer that this embodiment provided includes setting of extensible member, valve through the bolster to the valve has open state, closed state, has realized the deformation of bolster at electrode assembly inflation in-process, retrains electrode assembly's inflation process that charges, and the valve is in open state, closed state down, all does not allow the fluid in other regions to get into the extensible member, can keep the inside electrolyte of battery monomer balanced, does benefit to the energy density that maintains battery monomer.

In some embodiments, the fluid comprises a gas and the valve comprises a one-way pneumatic valve.

The battery monomer that this application embodiment provided includes gas through the fluid, and the valve includes the setting of one-way pneumatic valve, does benefit to the deformation that realizes the bolster in the electrode assembly inflation process to can not cause the influence to the battery monomer internal environment.

In some embodiments, the number of cushioning members is a plurality, each cushioning member extending in a first direction, each cushioning member including at least one-way pneumatic valve.

The battery monomer that this application embodiment provided through the setting of a plurality of cushioning members, can improve the restraining force of cushioning members to electrode assembly.

In some embodiments, the side walls include a first side wall and a second side wall, the first side wall is connected to the second side wall, the area of the first side wall is larger than the area of the second side wall, and the buffer is connected to the first side wall.

The battery monomer that this application embodiment provided, through the setting that bolster and first side wall are connected, first side wall corresponds the parcel in electrode assembly's big face, and electrode assembly's big face is the position that the inflation takes place most easily, so sets up for the bolster can play the effect of constraint to electrode assembly accurately, and the bolster is installed the setting easily at first side wall.

In some embodiments, the buffer member is connected to a side of the first sidewall remote from the electrode assembly.

The battery monomer that this application embodiment provided is kept away from the setting that one side of electrode assembly was connected through bolster and first lateral wall, can be convenient for the bolster be connected with the insulating film, and the preparation assembly of insulating assembly of being convenient for can avoid valve to electrode assembly fish tail damage etc..

In some embodiments, the cushioning member comprises at least one of a sheet-like structure or a pouch-like structure.

The battery monomer that this application embodiment provided through setting up the concrete structure of bolster, can select the structure of suitable bolster according to actual conditions, and the flexibility is strong.

In some embodiments, the battery cell further comprises an end cap assembly, wherein the end cap assembly covers the housing and closes the accommodating cavity, and one side of the end cap assembly, which is close to the housing, is connected with the insulating film.

The battery monomer that this application embodiment provided can be fixed in the battery monomer inside through being connected between insulating film and the end cover subassembly to through welding or hot melt connection improved the fastness that insulating film and end cover subassembly are connected.

In some embodiments, the end cap assembly is hot melt or welded to the insulating film.

The battery monomer that this application embodiment provided, end cover subassembly and insulating film pass through hot melt connection or welded connection adaptation in insulating film and end cover subassembly's material, are connected easily.

In a second aspect, embodiments of the present application provide a battery comprising a battery cell of any one of the embodiments described above.

The battery that this embodiment provided through the battery monomer including insulation component, insulation component includes insulation film and the setting of bolster, can reduce the inside battery monomer probability of wrinkling of battery to can reduce the inside stress of battery monomer, reduce the problem of circulating diving, improve the quality of battery.

In a third aspect, an embodiment of the present application provides an electrical device, including a battery according to any one of the embodiments described above.

According to the power utilization device, through the arrangement of the battery, the efficiency of the power utilization device can be improved, the service life of the battery of the power utilization device is prolonged, and the user experience is improved.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic structural view of an embodiment of a vehicle of the present application;

FIG. 2 is an exploded view of one embodiment of a battery of the present application;

FIG. 3 is a schematic view of an embodiment of a battery cell of the present application;

FIG. 4 is a schematic cross-sectional view of one view of an embodiment of a battery cell of the present application;

fig. 5 is a schematic cross-sectional view of another view of an embodiment of a battery cell of the present application.

Reference numerals in the specific embodiments are as follows:

1, a vehicle;

10 batteries;

a 20 controller;

a 30 motor;

100 battery cells;

110 a housing;

120 electrode assemblies;

130 an insulation assembly;

131 an insulating film; 1311 sidewalls; a1 a first side wall; a2 a second sidewall; 1312 a bottom wall;

132 cushioning member; 1321 telescoping member; 1322 valve;

140 end cap assembly;

200 boxes.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

It should be noted that unless otherwise indicated, technical or scientific terms used in the embodiments of the present application should be given the ordinary meanings as understood by those skilled in the art to which the embodiments of the present application belong.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

Furthermore, the technical terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or be integrated; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of embodiments of the present application, unless explicitly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intermediary. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

The electric devices mentioned in the embodiments of the present application may be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys, electric tools, and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric device in particular.

For convenience of explanation, the following examples will be described taking an electric device as an example of a vehicle.

Fig. 1 is a schematic structural view of an embodiment of a vehicle of the present application.

The vehicle 1 can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extending vehicle.

As shown in fig. 1, the internal structure of the vehicle 1 is provided with a battery 10, the battery 10 may be provided at the bottom or the head or the tail of the vehicle 1, the battery 10 may be used for power supply of the vehicle 1, and for example, the battery 10 may be used as an operation power source of the vehicle 1.

The vehicle 1 may include a controller 20 and a motor 30, the controller 20 being configured to control the battery 10 to power the motor 30, for example, for starting, navigating, and operating power requirements during driving of the vehicle 1.

In some embodiments of the present application, the battery 10 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, providing driving power for the vehicle 1 instead of or in part instead of fuel oil or natural gas.

As shown in fig. 2, the battery 10 referred to in the embodiments of the present application refers to a single physical module including one or more battery cells 100 to provide higher voltage and capacity. For example, the battery 10 mentioned in the present application may include a battery 10 module or a battery pack, or the like. The battery 10 generally includes a housing 200 for enclosing one or more battery cells 100. The case 200 can prevent the liquid or other foreign matter from affecting the charge or discharge of the battery cell 100.

In this embodiment, the battery cell 100 may be a secondary battery cell, and the secondary battery cell refers to the battery cell 100 that can activate the active material by charging after the battery cell 100 discharges and continue to be used.

The battery cell 100 may be a lithium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, or the like, which is not limited in this embodiment.

The battery cell 100 generally includes an electrode assembly 120. The electrode assembly 120 includes a positive electrode and a negative electrode. During charge and discharge of the battery cell 100, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode.

In some embodiments, the battery cell 100 further includes an electrolyte that serves to conduct ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in this application, and may be selected according to the need. The electrolyte may be liquid, gel or solid.

In some embodiments, battery cell 100 may include a housing 110. The case 110 is used to encapsulate the electrode assembly 120, electrolyte, and the like. The shell 110 may 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.

In the manufacturing process of the battery cell 100, there is a certain space between the electrode assembly 120 of the battery cell 100 and the case 110 for the convenience of assembly and chemical reaction inside the battery cell 100. However, during the charge and discharge of the electrode assembly 120, the volume of the electrode assembly 120 may be changed, and the space between the electrode assembly 120 and the case 110 may not have a binding force to the electrode assembly 120, which may easily wrinkle the electrode assembly 120.

In order to solve the problem that the electrode assembly 120 is easily wrinkled due to the fact that the volume of the electrode assembly 120 is changed during the charge and discharge of the electrode assembly 120 and the space between the electrode assembly 120 and the case 110 does not have a binding force to the electrode assembly 120 in the related art, it has been found that the above problem can be solved by improving the structure of the battery cell 100.

Referring to fig. 3 to 5, fig. 3 is a schematic structural view of an embodiment of a battery cell of the present application, fig. 4 is a schematic sectional view of an embodiment of a battery cell of the present application from one view angle, and fig. 5 is a schematic sectional view of an embodiment of a battery cell of the present application from another view angle.

The embodiment provides a battery cell 100, which comprises a shell 110, an electrode assembly 120 and an insulation assembly 130. The case 110 has a receiving cavity in which the electrode assembly 120 is disposed. The insulation member 130 is disposed between the case 110 and the electrode assembly 120, the insulation member 130 includes an insulation film 131 and a buffer member 132, the insulation film 131 is configured to insulate the electrode assembly 120 from the case 110, the buffer member 132 is connected with the insulation film 131 and is capable of supporting the electrode assembly 120, and the buffer member 132 is configured to deform as the electrode assembly 120 expands.

The material of the insulating film 131 includes a plastic material, a rubber material, and the like.

In the process of manufacturing the battery cell 100, the insulating member 130 is first coated on the side wall 1311 and the bottom wall 1312 of the electrode assembly 120, and the insulating member 130 has the function of preventing the electrode assembly 120 from being mechanically damaged during the assembly process.

The buffer 132 may be disposed at a side of the insulating film 131 adjacent to the electrode assembly 120, or may be disposed at a side of the insulating film 131 adjacent to the case 110.

The material of the buffer member 132 includes a material body that can be elastically deformed by a predetermined pressure, such as a silicone material, a latex material, or the like. The number of buffers 132 may be one, two, or even more.

The buffer 132 may include one of a balloon and an elastomer.

Alternatively, the buffer 132 is configured to deform as the electrode assembly 120 expands, meaning that the buffer 132 is configured to decrease in volume as the electrode assembly 120 expands.

The battery cell 100 provided in the embodiment of the application is connected with the insulating film 131 through the buffer member 132 and can support the arrangement of the electrode assembly 120, and the buffer member 132 can play a role in restraining the electrode assembly 120. In the related art, since the electrode assembly 120 is restrained with the case 110 without the buffer 132, both sides of the side of the electrode assembly 120 have a large restraining force to restrain the side, the side is positioned in the middle with a small restraining force as compared with both sides of the side, and the side is positioned in the middle and may be expanded too much to bulge during the charging process, and the surface is not smooth and wrinkled at the bulge during the discharging and shrinking process.

However, in the battery cell 100 provided in the embodiment of the present application, in the process of charging and expanding the electrode assembly 120, due to the restraint of the buffer 132 on the electrode assembly 120, a uniform restraining force can be generated on the electrode assembly 120, so that the electrode assembly 120 can be uniformly expanded when expanding, the phenomenon of local swelling of the electrode assembly 120 is reduced, the probability of irregular uncontrollable expansion of the electrode assembly 120 is reduced, and further, due to the restraint of the buffer 132, the electrode assembly 120 is uniformly expanded in the charging process, and the probability of local excessive expansion swelling of the electrode assembly 120 is reduced, so that in the discharging and shrinking process of the electrode assembly 120, the probability of local wrinkling of the electrode assembly 120 due to local swelling can be reduced. In addition, since the volume of the electrode assembly 120 is increased in the continuous charge and discharge process, the buffer member 132 can be set along with the deformation of the electrode assembly 120 in the expansion process, so that the expansion space of the electrode assembly 120 is yielded through the deformation of the buffer member, and the expansion space of the electrode assembly 120 can be restrained at the same time, so that the problem of circulating water jump caused by overlarge internal stress of the electrode assembly 120 is avoided.

In some embodiments, the buffer 132 includes a telescoping member 1321, a valve 1322. The expansion element 1321 is connected to the insulating film 131, and the expansion element 1321 and the insulating film 131 enclose a chamber, in which a fluid is disposed. The valve 1322 is mounted on the expansion member 1321, the valve 1322 includes an open state and a closed state, in the closed state, fluid is located in the chamber, the volume of the expansion member 1321 is V1, in the open state, fluid in the chamber flows out, and the volume of the expansion member 1321 is V2, V2 is less than V1.

The fluid comprises a liquid, a gas, optionally a gas.

The expansion element 1321 and the insulating film 131 may be bonded, welded, or the like, and the expansion element 1321 and the insulating film 131 may be integrally formed.

The battery monomer 100 provided by the embodiment of the application includes the expansion piece 1321 and the valve 1322 through the buffer piece 132, and the valve 1322 has an open state and a closed state, so that the deformation of the buffer piece 132 in the expansion process of the electrode assembly 120 is realized, the charge expansion process of the electrode assembly 120 is restrained, and the valve 1322 does not allow the fluid in other areas to enter the expansion piece 1321 in the open state and the closed state, so that the balance of electrolyte in the battery monomer 100 can be kept, and the energy density of the battery monomer 100 is favorably maintained.

In some embodiments, the fluid comprises a gas, the valve 1322 comprises a one-way pneumatic valve, and the number of cushioning members 132 is a plurality, each cushioning member 132 extending in a first direction, each cushioning member 132 comprising at least one-way pneumatic valve.

The gas does not react with chemical systems such as electrolyte in the motor assembly.

The one-way air pressure valve comprises a spring one-way air pressure valve, a diaphragm one-way air pressure valve and the like.

The number of cushioning members 132 may be two, three, etc., with each cushioning member 132 comprising one, two, or more one-way pneumatic valves.

The battery monomer 100 that this application embodiment provided, through the setting that the fluid includes gas, valve 1322 package one-way pneumatic valve does benefit to the deformation that realizes buffer 132 in electrode assembly 120 inflation process to can not lead to the fact the influence to battery monomer 100 internal environment, the setting of a plurality of buffer 132 can improve buffer 132 to electrode assembly 120's constraint power.

In some embodiments, insulating film 131 includes sidewalls 1311, bottom wall 1312, and buffer 132 is located on at least a portion of sidewalls 1311.

The side wall 1311 of the insulating film 131 is provided around the side surface of the electrode assembly 120, and the buffer 132 may be located on the entire side wall 1311 of the insulating film 131 or may be located on a part of the side wall 1311 of the insulating film 131.

According to the battery cell 100 provided by the embodiment of the application, the side surface of the electrode assembly 120 is easy to expand, the buffer member 132 is located at least in a part of the side wall 1311, and the battery cell can be suitable for the position where the electrode assembly 120 is easy to expand, so that materials can be saved, and the buffer member 132 has a good constraint effect.

In some embodiments, the sidewall 1311 includes a first sidewall A1 and a second sidewall A2, the first sidewall A1 is connected to the second sidewall A2, the area of the first sidewall A1 is larger than the area of the second sidewall A2, and the buffer 132 is connected to the first sidewall A1.

Alternatively, two first side walls A1 and two second side walls A2 are provided, the two first side walls A1 are arranged in parallel, the two second side walls A2 are arranged in parallel, and the first side walls A1 and the second side walls A2 cross in the extending direction.

The battery monomer 100 that this application embodiment provided, through the setting that buffer 132 and first side wall A1 are connected, first side wall A1 corresponds the parcel in electrode assembly 120's big face, and electrode assembly 120's big face is the position that the most easily takes place to expand, so sets up for buffer 132 can play the effect of constraint to electrode assembly 120 accurately, and buffer 132 installs the setting easily at first side wall A1.

In some embodiments, the buffer 132 is connected to a side of the first sidewall A1 remote from the electrode assembly 120.

The battery monomer 100 that this application embodiment provided, through the setting that one side that buffer 132 and first lateral wall A1 kept away from electrode assembly 120 was connected, the buffer 132 of can being convenient for was connected with insulating film 131, the preparation assembly of insulating assembly 130 of being convenient for, can avoid valve 1322 to electrode assembly 120 fish tail damage etc..

In some embodiments, the bumper 132 comprises at least one of a sheet-like structure or a pouch-like structure.

The shape of the sheet structure may be a regular shape or an irregular sheet structure.

Optionally, the buffer member 132 includes a sheet structure, the shape of the sheet structure includes a rectangular structure, the edge of the rectangular structure is connected with the insulating film 131, and an integral structure may be formed between the two structures, or may be connected by bonding, hot melt connection, or the like, fluid is located between the buffer member 132 and the insulating film 131, the valve 1322 is disposed on the buffer member 132, when the valve 1322 is closed, the fluid is located between the buffer member 132 and the insulating film 131, and when the valve 1322 is opened, the fluid flows out and accompanies deformation of the sheet buffer member.

Optionally, the buffer member 132 comprises a bag-like structure, the end of the bag-like structure is connected to the insulating film 131, the connection between the two can be achieved by bonding, hot melt connection, etc., when the valve 1322 is closed, fluid is located between the buffer member 132 and the insulating film 131, and when the valve 1322 is opened, the fluid flows out and accompanies deformation of the bag-like buffer member.

The battery monomer 100 provided in this embodiment of the present application, through setting up the concrete structure of the buffer 132, can select the structure of suitable buffer 132 according to actual conditions, and the flexibility is strong.

In some embodiments, the battery cell 100 further includes an end cap assembly 140, wherein the end cap assembly 140 covers the housing 110 and closes the receiving chamber, and one side of the end cap assembly 140 adjacent to the housing 110 is connected to the insulating film 131.

The connection of the end cap assembly 140 and the insulating film 131 may be connected by at least one of welding or hot melt connection, and the connection sites between the end cap assembly 140 and the insulating film 131 may be one, two, or even more.

The battery cell 100 provided by the embodiment of the application can fix the insulating film 131 inside the battery cell 100 through the connection between the insulating film 131 and the end cover assembly 140, and the firmness of the connection between the insulating film 131 and the end cover assembly 140 is improved through welding or hot melting connection.

In some embodiments, the end cap assembly 140 is thermally fused or welded to the insulating film 131.

The cap assembly 140 may include a cap plate and an insulating plate near one side of the case 110, and the cap assembly 140 may be thermally fusion-connected or welded to the insulating film 131 through the insulating plate.

In the battery unit 100 provided in the embodiment of the application, the end cover assembly 140 and the insulating film 131 are adapted to the materials of the insulating film 131 and the end cover assembly 140 through fusion connection or welding connection, and are easy to connect.

The embodiment of the application provides a battery cell 100, and the battery cell 100 includes a housing 110, an electrode assembly 120, an insulation assembly 130, and an end cap assembly 140. The case 110 has a receiving cavity in which the electrode assembly 120 is disposed, and the cap assembly 140 covers the case 110 and closes the receiving cavity. The electrode assembly 120 is of a cuboid structure, the insulating assembly 130 comprises an insulating film 131 and a buffer member 132, the insulating assembly 130 is arranged between the housing 110 and the electrode assembly 120, the insulating film 131 comprises a first side wall A1, a second side wall A2 and a bottom wall 1312, the area of the first side wall A1 is larger than that of the second side wall A2, the buffer member 132 is located on one side, far away from the electrode assembly 120, of the first side wall A1, the buffer member 132 comprises a telescopic member 1321 and a one-way air pressure valve, the telescopic member 1321 is connected with the first side wall A1 of the insulating film 131, the one-way air pressure valve is arranged on one side, close to the end cover assembly 140, of the telescopic member 1322, and the buffer member 132 extends along the first direction. The inside of the expansion element 1321 can contain gas, and the one-way air pressure valve can release the gas inside the expansion element 1321.

The battery 10 provided in the embodiments of the present application includes the battery cell 100 of any of the embodiments described above.

The battery 10 that this embodiment provided, through the battery monomer 100 including insulating subassembly 130, insulating subassembly 130 includes insulating film 131 and buffer 132's setting, can reduce the inside battery monomer 100 of battery 10 and beat the probability of wrinkling to can reduce the inside stress of battery monomer 100, reduce the problem of circulation diving, improve the quality of battery 10.

The power utilization device provided in the embodiment of the present application includes the battery 10 of any one of the embodiments described above.

According to the power utilization device provided by the embodiment of the application, through the arrangement of the battery 10, the efficiency of the power utilization device can be improved, the service life of the battery 10 of the power utilization device is prolonged, and the user experience is improved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, comprising:

a housing having a receiving cavity;

an electrode assembly disposed in the receiving chamber;

the insulation component is arranged between the shell and the electrode component, the insulation component comprises an insulation film and a buffer piece, the insulation film is configured to insulate the electrode component from the shell, the buffer piece is connected with the insulation film and can support the electrode component, the buffer piece is configured to deform along with expansion of the electrode component, the insulation film comprises a side wall and a bottom wall, and the buffer piece is positioned on at least part of the side wall.

2. The battery cell of claim 1, wherein the buffer comprises:

the telescopic piece is connected with the insulating film, and is enclosed with the insulating film to form a cavity, and fluid is arranged in the cavity;

the valve is arranged on the telescopic piece and comprises an opening state and a closing state, the fluid is located in the cavity in the closing state, the volume of the telescopic piece is V1, the fluid in the cavity flows out in the opening state, and the volume of the telescopic piece is V2, and V2 is smaller than V1.

3. The battery cell of claim 2, wherein the fluid comprises a gas and the valve comprises a one-way pneumatic valve.

4. A battery cell according to claim 3, wherein the number of cushioning members is plural, each cushioning member extending in a first direction, each cushioning member including at least one-way air pressure valve.

5. The battery cell of claim 1, wherein the side wall comprises a first side wall and a second side wall, the first side wall is connected to the second side wall, the first side wall has an area greater than an area of the second side wall, and the buffer is connected to the first side wall.

6. The battery cell of claim 5, wherein the buffer is coupled to a side of the first sidewall remote from the electrode assembly.

7. The battery cell of claim 1, wherein the buffer comprises at least one of a sheet-like structure or a pouch-like structure.

8. The battery cell of claim 1, further comprising an end cap assembly that covers the housing and encloses the receiving chamber, the end cap assembly being connected to the insulating film on a side of the housing that is adjacent to the housing.

9. The battery cell of claim 8, wherein the end cap assembly is thermally fused or welded to the insulating film.

10. A battery comprising the battery cell of any one of claims 1 to 9.

11. An electrical device comprising the battery of claim 10.