Battery cell, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device. The battery cell includes a housing, an insulating film, and a buffer. The insulating film is arranged on the outer side of the shell and wraps at least part of the shell, a through hole is formed in the insulating film, at least part of the buffering piece is arranged in the through hole, and the buffering piece is connected to at least one of the shell and the insulating film. According to the battery monomer provided by the embodiment of the invention, the through hole is formed in the insulating film, and at least part of the buffer piece is arranged in the through hole, so that the space occupied by the buffer piece is increased, the space utilization rate of the battery monomer is increased, and the energy density is improved; the buffer piece can provide a larger buffer space for expansion of the shell, so that the influence on other surrounding battery monomers is reduced, and the risk of failure of the battery structure is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] How to improve energy density is an important research direction in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device. The battery cell provided in the embodiments of the present application can improve the energy density.

[0005] The embodiment of the present application provides a battery cell, the battery cell comprising a shell, an insulating film and a buffer. The insulating film is arranged on the outer side of the shell and covers at least a portion of the shell, the insulating film is provided with a through hole, the buffer is at least partially arranged in the through hole, and the buffer is connected to at least one of the shell and the insulating film.

[0006] A battery cell provided in an embodiment of the present application has an insulating film provided with a through hole and a buffer component at least partially arranged in the through hole, thereby increasing the space occupied by the buffer component, improving the space utilization rate of the battery cell, and improving the energy density. When the electrode assembly inside the battery cell expands and thus causes the outer shell to expand, the buffer component can provide a larger buffer space for the expansion of the outer shell, reducing the impact on other surrounding battery cells, and further reducing the risk of battery cell failure.

[0007] In some embodiments, the buffer has a thickness greater than a thickness of the insulating film.

[0008] By making the buffer component have a thickness greater than that of the insulating film, the buffering capacity of the buffer component can be improved, the expansion force of the battery cell can be reduced, and the risk of battery cell failure can be reduced.

[0009] In some embodiments, the outer periphery of the buffer is connected to the hole wall of the through hole.

[0010] The buffer can seal the through hole, thereby improving the insulation effect between the buffer and the through hole, thereby improving the insulation effect of the battery cell, and can improve the connection strength between the buffer and the hole wall of the through hole.

[0011] In some embodiments, the insulating film and the buffer are connected by at least one of bonding and welding. The bonding process and the welding process are easy to implement. The bonding or welding method can improve the connection strength between the insulating film and the buffer and simplify the connection process between the insulating film and the buffer.

[0012] In some embodiments, the thermal conductivity of the buffer is lower than the thermal conductivity of the housing.

[0013] The buffer has a low thermal conductivity, which can reduce the transfer of heat inside the battery cell and reduce the risk of the battery cell affecting other surrounding battery cells or the box body.

[0014] In some embodiments, the housing includes two first side walls, the two first side walls are arranged opposite to each other along the thickness direction of the battery cell, and at least one of the first side walls is connected to a buffer.

[0015] During the charging process of the battery cell, the battery cell expands greatly along its thickness direction. By arranging a buffer on at least one first side wall, the expansion of the electrode assembly can be effectively absorbed, thereby reducing the expansion force of the electrode assembly.

[0016] In some embodiments, the battery cell also includes an electrode assembly housed in the outer shell, the electrode assembly includes a straight portion and two bent portions, the two bent portions are respectively located at two ends of the straight portion, and the arrangement direction of the two bent portions is perpendicular to the thickness direction; in the arrangement direction, the two ends of the buffer exceed the straight portion.

[0017] During the charging process of the battery cell, the electrode assembly is more likely to expand in the straight portion. The buffer can cover the area where the electrode assembly is prone to expand and the first side wall is prone to expand, effectively improving the rationality of the position arrangement of the buffer, thereby improving the buffer effect of the buffer.

[0018] In some embodiments, the first sidewall includes a first region covered by an insulating film and a second region covered by a buffer, and the first region surrounds the second region.

[0019] When the insulating film is coated, an allowable error is provided, and the installation of the buffer component also avoids the corner area, thereby reducing the assembly difficulty of the insulating film coating and the buffer component installation.

[0020] In some embodiments, the shell includes two second side walls and four bent walls, the two second side walls are arranged opposite to each other along a first direction, the first direction is perpendicular to the thickness direction, and the first side wall and the second side wall are connected by the bent wall; the first area includes a first part connected to the bent wall, and the size of the first part along the first direction is 1mm-10mm.

[0021] The position of the bent wall can be avoided, so that the buffer component has better flatness, the difficulty of assembling the buffer component is reduced, and the buffering effect of the buffer component is guaranteed.

[0022] In some embodiments, the housing includes a shell and an end cover, the shell has an opening at one end along the second direction, and the end cover covers the opening; the shell includes a first side wall, a second side wall and a bent wall; the first area also includes a second part, and the second part is located on a side of the second area close to the end cover along the second direction; the size of the second part along the second direction is less than or equal to the size of the first part along the first direction.

[0023] A margin of error is provided for connecting the insulating film to the shell, which reduces the difficulty of alignment during the assembly process and improves the assembly efficiency of the battery cell.

[0024] An embodiment of the present application provides a battery, comprising a battery cell of any of the above embodiments.

[0025] A battery provided in an embodiment of the present application provides a larger buffer space for the expansion of each battery cell through the arrangement of battery cells, thereby reducing the risk of battery structure failure.

[0026] An embodiment of the present application provides an electrical device, comprising a battery in any of the above embodiments.

[0027] An electric device provided in an embodiment of the present application improves the reliability of the battery, reduces the operation and maintenance cost of the electric device, and improves the user experience through the setting of the battery.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0030] Figure 1 It is a structural schematic diagram of a vehicle embodiment of the present application;

[0031] Figure 2 is an exploded schematic diagram of a battery embodiment of the present application;

[0032] Figure 3 is a schematic structural diagram of a battery cell of an embodiment of the present application;

[0033] Figure 4 It is a structural schematic diagram of a part of the structure of a battery cell in an embodiment of the present application;

[0034] Figure 5 is a structural schematic diagram of another part of the structure of a battery cell in an embodiment of the present application;

[0035] Figure 6 It is a cross-sectional schematic diagram of an embodiment of a battery cell of the present application.

[0036] The reference numerals in the specific implementation manner are as follows:

[0037] 1 vehicle;

[0038] 10 batteries;

[0039] 100 battery cells; X thickness direction; Y first direction; Z second direction;

[0040] 110 housing;

[0041] 111 housing; 111a first side wall; 1111 first area; A1 first part; A2 second part; 1112 second area; 111b second side wall; 111c bent wall;

[0042] 112 end cap;

[0043] 120 insulating film;

[0044] 121 through hole;

[0045] 130 buffer parts;

[0046] 140 electrode assembly;

[0047] 141 straight part;

[0048] 142 bending portion;

[0049] 200 cabinets;

[0050] 20 motors;

[0051] 30 controllers. DETAILED DESCRIPTION

[0052] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0053] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0054] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0055] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0056] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0059] The battery includes multiple battery cells, and buffers are installed between the battery cells. The battery cells may expand during operation and squeeze the surrounding battery cells. The function of the buffer is to buffer the expansion force of the battery cells. However, in the related art, the buffer takes up insufficient space, and the thickness of the buffer is relatively small, which increases the risk of battery structure failure.

[0060] Based on the above considerations, in order to solve the above problems, it is found through research that the above problems can be solved by improving the structure of the battery cell, and specifically a battery cell is proposed, the battery cell includes a shell, an insulating film and a buffer. The insulating film is arranged on the outside of the shell and covers at least part of the shell, the insulating film is provided with a through hole, the buffer is at least partially arranged in the through hole, and the buffer is connected to at least one of the shell and the insulating film.

[0061] In a battery cell provided by an embodiment of the present application, an insulating film is provided with a through hole and a buffer is at least partially arranged in the through hole, thereby increasing the space occupied by the buffer, improving the space utilization rate of the battery cell, and increasing the energy density. When the electrode assembly inside the battery cell expands and thus the outer shell expands, the buffer can provide a larger buffer space for the expansion of the outer shell, reducing the impact on other surrounding battery cells and reducing the risk of battery structure failure.

[0062] The electrical devices mentioned in the embodiments of the present application may be vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes airplanes, rockets, space shuttles, and spacecrafts, etc.; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0063] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0064] Please refer to Figure 1 As shown, Figure 1It is a schematic diagram of the structure of an embodiment of a vehicle of the present application. Vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 10 is arranged inside the vehicle 1, and the battery 10 can be arranged at the bottom, head or tail of the vehicle 1. The battery 10 can be used to power the vehicle 1. For example, the battery 10 can be used as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 30 and a motor 20. The controller 30 is used to control the battery 10 to power the motor 20, for example, for the starting, navigation and driving power requirements of the vehicle 1.

[0065] Please refer to Figure 2 As shown, Figure 2 1 is an exploded schematic diagram of an embodiment of a battery 10 of the present application. The battery 10 mentioned in the embodiment of the present application refers to a single physical module including one or more battery cells 100 to provide higher voltage and capacity.

[0066] In some embodiments, the battery 10 may be a battery 10 module. When there are multiple battery cells 100, the multiple battery cells 100 are arranged and fixed to form a battery 10 module.

[0067] In some embodiments, the battery 10 may be a battery 10 pack, which includes a case 200 and a battery cell 100 , wherein the battery cell 100 or a battery 10 module is accommodated in the case 200 .

[0068] In some embodiments, the box 200 may be a part of the chassis structure of the vehicle 1. For example, part of the box 200 may become at least a part of the floor of the vehicle 1, or part of the box 200 may become at least a part of the cross beam and longitudinal beam of the vehicle 1.

[0069] In some embodiments, the battery 10 may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0070] Please refer to Figures 3 to 5 As shown, Figure 3 is a schematic structural diagram of a battery cell 100 according to an embodiment of the present application. Figure 4 is a structural diagram of a part of the structure of a battery cell 100 in an embodiment of the present application, Figure 5 It is a structural diagram of another part of the structure of a battery cell 100 in an embodiment of the present application.

[0071] The embodiment of the present application provides a battery cell 100, which includes a housing 110, an insulating film 120, and a buffer 130. The insulating film 120 is disposed on the outer side of the housing 110 and covers at least a portion of the housing 110, the insulating film 120 is provided with a through hole 121, the buffer 130 is at least partially disposed in the through hole 121, and the buffer 130 is connected to at least one of the housing 110 and the insulating film 120.

[0072] As an example, the battery cell 100 may be a cylindrical battery cell 100, a prismatic battery cell 100, a soft-pack battery cell 100 or a battery cell 100 of other shapes, the prismatic battery cell 100 includes a square-shell battery cell 100, a blade-shaped battery cell 100, a polygonal battery 10, and the polygonal battery 10 is, for example, a hexagonal battery 10, etc.

[0073] Optionally, the housing 110 includes a shell 111 and an end cover 112, and the end cover 112 is covered on the shell 111. The end cover 112 refers to a component that covers the opening of the shell 111 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cover 112 can be adapted to the shape of the shell 111 to match the shell 111. Optionally, the end cover 112 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cover 112 is not easily deformed when squeezed and collided, so that the battery cell 100 can have a higher structural strength and the safety performance can also be improved.

[0074] The shell 111 is a component used to cooperate with the end cap 112 to form the internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 140, the electrolyte and other components. The shell 111 and the end cap 112 can be independent components, and an opening can be set on the shell 111, and the internal environment of the battery cell 100 is formed by covering the opening with the end cap 112 at the opening. Without limitation, the end cap 112 and the shell 111 can also be integrated. Specifically, the end cap 112 and the shell 111 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 111, the end cap 112 covers the shell 111. The shell 111 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 111 can be determined according to the specific shape and size of the electrode assembly 140. The shell 111 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0075] The insulating film 120 is a thin film that can ensure good electrical insulation and is used to insulate the battery cell 100 from the surrounding environment.

[0076] Optionally, the through hole 121 is provided through the insulating film 120 along the thickness of the insulating film 120 , and the shape of the through hole 121 includes but is not limited to a rectangular parallelepiped, a cube, a cylinder or other special shapes.

[0077] The buffer 130 includes but is not limited to a solid pad (such as a rubber pad) or a hollow structure (such as an air bag). When the electrode assembly 140 expands, the housing 110 compresses the buffer 130 so as not to squeeze the surrounding battery cells 100. The buffer 130 may be located entirely or partially in the through hole 121.

[0078] The buffer 130 may be connected to the housing 110 or to the insulating film 120 , or the buffer 130 may be connected to both the housing 110 and the insulating film 120 . Optionally, the buffer 130 may be connected to both the housing 110 and the insulating film 120 .

[0079] Optionally, the buffer member 130 includes an insulating material, and the buffer member 130 and the insulating film 120 insulate the battery cell 100 from the external environment.

[0080] The battery cell 100 provided in one embodiment of the present application increases the space occupied by the buffer 130 by providing the through hole 121 in the insulating film 120 and at least partially providing the buffer 130 in the through hole 121, thereby improving the space utilization rate of the battery cell 100 and the energy density. When the electrode assembly 140 inside the battery cell 100 expands so that the housing 110 expands, the buffer 130 can provide a larger buffer space for the expansion of the housing 110, reduce the impact on other surrounding battery cells 100, and reduce the risk of failure of the battery cell 100.

[0081] In some embodiments, the thickness of the buffer 130 is greater than the thickness of the insulating film 120 .

[0082] Since stress and strain are positively correlated when the materials are the same, the thicker the buffer 130 is, the larger the expansion space that can be provided.

[0083] The thickness of the buffer member 130 is greater than that of the insulating film 120 and can be adjusted according to actual conditions.

[0084] In a battery cell 100 provided in an embodiment of the present application, the buffering capacity of the buffer 130 can be improved by setting the thickness of the buffer 130 to be greater than the thickness of the insulating film 120, thereby reducing the risk of structural failure of the battery 10 due to insufficient thickness of the buffer 130, which makes it insufficient for the buffer 130 to absorb the expansion force of the outer shell 110 when the outer shell 110 expands.

[0085] In some embodiments, the outer periphery of the buffer 130 is connected to the hole wall of the through hole 121 .

[0086] The connection method between the outer periphery of the buffer member 130 and the hole wall of the through hole 121 includes but is not limited to bonding, welding, etc.

[0087] A battery cell 100 provided in an embodiment of the present application is connected to the hole wall of the through hole 121 through the outer periphery of the buffer 130, so that the buffer 130 can seal the through hole 121, thereby improving the insulation effect between the buffer 130 and the through hole 121, thereby improving the insulation effect of the battery cell 100, and can improve the connection strength between the buffer 130 and the hole wall of the through hole 121.

[0088] In some embodiments, the insulating film 120 and the buffer member 130 are connected by at least one of bonding and welding.

[0089] Optionally, the insulating film 120 and the buffer member 130 are connected by insulating glue.

[0090] In a battery cell 100 provided in an embodiment of the present application, the insulating film 120 and the buffer member 130 are connected by at least one of bonding and welding, so the connection process is simplified, the required equipment is relatively simple and the cost is low.

[0091] In some embodiments, the thermal conductivity of the buffer 130 is lower than the thermal conductivity of the housing 110 .

[0092] A low thermal conductivity means that the material has stronger thermal insulation ability. Materials with low thermal conductivity have good thermal insulation properties and can effectively reduce heat transfer.

[0093] In a battery cell 100 provided in an embodiment of the present application, the thermal conductivity of the buffer 130 is set lower than the thermal conductivity of the outer shell 110, so that the thermal conductivity of the buffer 130 is lower, which can reduce the transfer of heat inside the battery cell 100 and reduce the risk of thermal impact of the battery cell 100 on other surrounding battery cells 100 or the box 200.

[0094] In some embodiments, the housing 110 includes two first side walls 111 a , which are disposed opposite to each other along a thickness direction X of the battery cell 100 , and a buffer 130 is connected to at least one of the first side walls 111 a .

[0095] For example, if the housing 111 of the battery cell 100 has a rectangular parallelepiped shape, the thickness direction X of the battery cell 100 refers to the arrangement direction of the large surface of the housing 111 .

[0096] A buffer 130 is connected to one or both of the first side walls 111 a .

[0097] In a battery cell 100 provided in an embodiment of the present application, since the electrode assembly 140 is prone to expand in the thickness direction X during charging, a buffer member 130 is provided on at least one first side wall 111a to effectively absorb the expansion of the electrode assembly 140, thereby reducing the expansion force of the electrode assembly 140.

[0098] Please refer to Figure 6 As shown, Figure 6 1 is a cross-sectional schematic diagram of an embodiment of a battery cell 100 of the present application. In some embodiments, the battery cell 100 further includes an electrode assembly 140 accommodated in the housing 110, the electrode assembly 140 includes a straight portion 141 and two bent portions 142, the two bent portions 142 are respectively located at two ends of the straight portion 141, and the arrangement direction of the two bent portions 142 is perpendicular to the thickness direction X; in the arrangement direction, the two ends of the buffer 130 exceed the straight portion 141.

[0099] Optionally, in the arrangement direction, both ends of the buffer member 130 do not exceed the bending portion 142 .

[0100] Optionally, the arrangement direction is parallel to the first direction Y.

[0101] In a battery cell 100 provided in an embodiment of the present application, since the electrode assembly 140 is more likely to expand in the straight portion 141, by arranging the buffer member 130 so that both ends thereof extend beyond the straight portion 141 in the arrangement direction, the area where the electrode assembly 140 is prone to expand and the first side wall 111a is prone to expand can be covered, thereby effectively improving the rationality of the position arrangement of the buffer member 130 and thus improving the buffering effect of the buffer member 130.

[0102] In some embodiments, the first sidewall 111 a includes a first region 1111 covered by the insulating film 120 and a second region 1112 covered by the buffer 130 , and the first region 1111 surrounds the second region 1112 .

[0103] A battery cell 100 provided in an embodiment of the present application provides an allowable error when wrapping the insulating film 120 by setting the first area 1111 surrounding the second area 1112. The installation of the buffer 130 also avoids the corner area, reducing the assembly difficulty of wrapping the insulating film 120 and installing the buffer 130.

[0104] In some embodiments, the housing 110 includes two second side walls 111b and four bent walls 111c, the two second side walls 111b are arranged opposite to each other along a first direction Y, the first direction Y is perpendicular to the thickness direction X, the first side wall 111a and the second side wall 111b are connected by the bent wall 111c; the first area 1111 includes a first part A1 connected to the bent wall 111c, and the size of the first part A1 along the first direction Y is 1mm-10mm.

[0105] Optionally, the first side wall 111 a , the second side wall 111 b , and the bent wall 111 c comprise an integrated structure.

[0106] The size of the first portion A1 along the first direction Y includes 1 mm, 3 mm, 5 mm, 7 mm, 10 mm, etc.

[0107] When the dimension of the first part A1 along the first direction Y includes 1mm, the buffer 130 can avoid the position of the bending wall 111c, so that the buffer 130 is relatively flat during installation, which improves the fitting effect between the buffer 130 and the second area 1112 of the first side wall 111a, and the second area 1112, that is, the area occupied by the buffer 130, is relatively large, which can improve the buffering effect of the buffer 130; when the dimension of the first part A1 along the first direction Y includes 5mm, the buffer 130 can maintain a large distance from the bending wall 111c, and the area of ​​the buffer 130 is also large, and it has a better buffering effect; when the dimension of the first part A1 along the first direction Y includes 10mm, the distance between the buffer 130 and the bending wall 111c is relatively large, and the material of the buffer 130 can be saved, and the buffering effect is better.

[0108] A battery cell 100 provided in an embodiment of the present application can avoid the position of the bending wall 111c by setting the size of the first part A1 along the first direction Y, so that the buffer 130 has better flatness, reduces the difficulty of assembling the buffer 130, and ensures the buffering effect of the buffer 130.

[0109] In some embodiments, the housing 110 includes a shell 111 and an end cover 112, the shell 111 has an opening at one end along the second direction Z, and the end cover 112 covers the opening; the shell 111 includes a first side wall 111a, a second side wall 111b and a bent wall 111c; the first area 1111 also includes a second part A2, and the second part A2 is located on a side of the second area 1112 close to the end cover 112 along the second direction Z; the size of the second part A2 along the second direction Z is less than or equal to the size of the first part A1 along the first direction Y.

[0110] Optionally, the second portion A2 may also be disposed on a side of the second region 1112 along the second direction Z away from the end cover 112 .

[0111] A dimension of the second portion A2 along the second direction Z is less than or equal to 5 mm.

[0112] The size of the second portion A2 along the second direction Z is 0.1 mm, 0.5 mm, 1 mm, 2 mm, 4 mm, 5 mm, etc.

[0113] The battery cell 100 provided in one embodiment of the present application provides a margin of error for connecting the insulating film 120 to the shell 111 through the provision of the second portion A2, thereby reducing the difficulty of alignment during the assembly process and improving the assembly efficiency of the battery cell 100.

[0114] The embodiment of the present application provides a battery cell 100, including a shell 110, an insulating film 120 and a buffer 130. The insulating film 120 is arranged on the outer side of the shell 110 and covers at least a portion of the shell 110. The insulating film 120 is provided with a through hole 121. The buffer 130 is at least partially arranged in the through hole 121, and the buffer 130 is connected to at least one of the shell 110 and the insulating film 120. The thickness of the buffer 130 is greater than the thickness of the insulating film 120. The outer periphery of the buffer 130 is connected to the hole wall of the through hole 121. The shell 110 includes two first side walls 111a, the two first side walls 111a are arranged opposite to each other along the thickness direction X of the battery cell 100, and the two first side walls 111a are connected to the buffer 130. The battery cell 100 further includes an electrode assembly 140 accommodated in the housing 110. The electrode assembly 140 includes a straight portion 141 and two bent portions 142. The two bent portions 142 are respectively located at the two ends of the straight portion 141. The arrangement direction of the two bent portions 142 is perpendicular to the thickness direction X. In the arrangement direction, the two ends of the buffer 130 exceed the straight portion 141 and do not exceed the bent portions 142. The housing 110 includes two second side walls 111b and four bent walls 111c. The two second side walls 111b are arranged opposite to each other along a first direction Y. The first direction Y is perpendicular to the thickness direction X. The first side wall 111a and the second side wall 111b are connected by the bent wall 111c. The first region 1111 includes a first portion A1 connected to the bent wall 111c. The size of the first portion A1 along the first direction Y is 1mm-10mm. The shell 110 includes a shell 111 and an end cover 112. The shell 111 has an opening at one end along the second direction Z, and the end cover 112 covers the opening. The shell 111 includes a first side wall 111a, a second side wall 111b and a bent wall 111c. The first area 1111 also includes a second part A2, and the second part A2 is located on a side of the second area 1112 along the second direction Z close to the end cover 112; the size of the second part A2 along the second direction Z is 0mm-5mm.

[0115] An embodiment of the present application provides a battery 10, comprising a battery cell 100 of any of the above embodiments.

[0116] A battery 10 provided in an embodiment of the present application provides a larger buffer space for the expansion of each battery cell 100 through the arrangement of the battery cells 100, thereby reducing the risk of structural failure of the battery 10.

[0117] An embodiment of the present application provides an electrical device, comprising a battery 10 according to any of the above embodiments.

[0118] An electric device provided in an embodiment of the present application improves the reliability of the battery 10 , reduces the operation and maintenance cost of the electric device, and improves the user experience through the provision of the battery 10 .

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: shell; An insulating film, disposed on the outer side of the shell and covering at least a portion of the shell, wherein the insulating film is provided with a through hole; The buffer is at least partially disposed in the through hole, and the buffer is connected to at least one of the housing and the insulating film.

2. The battery cell according to claim 1, characterized in that: The buffer member has a thickness greater than that of the insulating film.

3. The battery cell according to claim 1, characterized in that: The outer periphery of the buffer is connected to the hole wall of the through hole.

4. The battery cell according to claim 1, characterized in that: The insulating film and the buffer member are connected by at least one of bonding and welding.

5. The battery cell according to claim 1, characterized in that: The thermal conductivity of the buffer is lower than the thermal conductivity of the housing.

6. The battery cell according to claim 1, characterized in that: The housing comprises two first side walls, and the two first side walls are arranged opposite to each other along the thickness direction of the battery cell; At least one of the first side walls is connected to the buffer component.

7. The battery cell according to claim 6, characterized in that: The battery cell further includes an electrode assembly contained in the housing, wherein the electrode assembly includes a straight portion and two bent portions, wherein the two bent portions are respectively located at two ends of the straight portion; The arrangement direction of the two bent portions is perpendicular to the thickness direction; in the arrangement direction, both ends of the buffer member exceed the straight portion.

8. The battery cell according to claim 6, characterized in that: The first side wall includes a first region covered by an insulating film and a second region covered by the buffer member, and the first region surrounds the second region.

9. The battery cell according to claim 8, characterized in that: The housing comprises two second side walls and four bent walls, the two second side walls are arranged opposite to each other along a first direction, the first direction is perpendicular to the thickness direction, and the first side wall and the second side wall are connected by the bent wall; The first region includes a first portion connected to the bending wall, and a size of the first portion along the first direction is 1 mm-10 mm.

10. The battery cell according to claim 9, characterized in that: The housing comprises a shell and an end cover, wherein one end of the shell along the second direction has an opening, and the end cover covers the opening; The housing comprises the first side wall, the second side wall and the bending wall; The first region further includes a second portion, the second portion being located on a side of the second region close to the end cap along the second direction; A size of the second portion along the second direction is smaller than or equal to a size of the first portion along the first direction.

11. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 10.

12. An electrical device, characterized in that: Comprising the battery of claim 11.

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