CN218548747U

CN218548747U - Insulating film, battery and electric device

Info

Publication number: CN218548747U
Application number: CN202223273043.6U
Authority: CN
Inventors: 林文法; 张均; 余明喜; 温耀铃
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-02-28
Anticipated expiration: 2032-12-07

Abstract

The application belongs to the technical field of batteries, and particularly relates to an insulating film, a battery and an electric device, wherein the insulating film is matched with an electrode assembly for use, the electrode assembly comprises a lug and a body, and the lug is connected with the end part of the body and extends outwards towards the body; the insulating film comprises a film body and a convex structure which is connected with the film body and protrudes out of the film body, and the film body is used for coating the body; a connecting area is formed at the connecting position of the body and the lug; the convex structure can push the connecting area towards the inside of the body along the thickness direction of the body; the convex structure is utilized to push the connecting area, so that the increase of the distance between two adjacent layers in the body is slowed down, the risk of lithium precipitation is reduced, the reliability of the electrode assembly is improved, and the long-term reliability of the battery is improved.

Description

Insulating film, battery and electric device

Technical Field

The application belongs to the technical field of batteries, and particularly relates to an insulating film, a battery and an electric device.

Background

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

The battery generally includes a top cap, an electrode assembly, and a case; during assembly, after the electrode assembly is arranged in the shell, the top cover is fixed at the opening of the shell, so that the battery is sealed; the electrode assembly is prone to service reliability problems.

SUMMERY OF THE UTILITY MODEL

The application aims to provide an insulating film, a battery and an electric device, and aims to solve the problem that an electrode assembly is easy to have use reliability.

In a first aspect, an embodiment of the present application provides an insulating film for use with an electrode assembly, the electrode assembly including a tab connected to an end of a body and extending outward of the body; the insulating film comprises a film body and a convex structure which is connected with the film body and protrudes out of the film body, and the film body is used for coating the body; a connecting area is formed at the connecting part of the body and the pole lug; the protruding structure can push the connecting area towards the inside of the body along the thickness direction of the body.

When the insulating film is used, the film body of the insulating film is coated on the body of the electrode assembly, then the insulating film and the electrode assembly are installed in the shell, and the protruding structure on the insulating film is located between the inner wall of the shell and the electrode assembly; and because the junction structure of body and utmost point ear has the joining region, protruding structure can follow the thickness direction of body and support towards the inside of body and push away the junction of body and utmost point ear promptly, consequently, protruding structure can be to utmost point ear play support push away and the supporting role, reduce the deformation offset that the top cap extrudeed utmost point ear, protruding structure also can be to the body play support push away and the supporting role, reduce the deformation offset that causes the body because of utmost point ear deformation offset, thereby slow down the interval grow between the adjacent two-layer in the body, reduce the lithium analysis risk, improve electrode assembly's reliability, improve the long-term reliability of battery.

In one embodiment, the connecting area comprises a body connecting area and a lug connecting area which are connected, wherein the body connecting area is formed on the body, and the lug connecting area is formed on the lug; the protruding structure is used for pushing against at least one of the tab connection area and the body connection area towards the inner part of the body along the thickness direction of the body.

The insulating film of this application embodiment can slow down the interval grow between adjacent two-layer in the body, reduces and educes the lithium risk, improves the reliability that the battery used.

In one embodiment, the protrusion structure includes a body pushing portion and a tab pushing portion; the body pushing part is used for pushing the body connecting area towards the inside of the body along the thickness direction of the body; and/or the pole lug abutting part is used for abutting against and pushing the pole lug connecting area towards the inside of the body along the thickness direction of the body.

In one embodiment, the body abutting part and the lug abutting part are both positioned on the surface of the film body facing the body; or the body abutting part and the lug abutting part are both positioned on the surface of the film body, which is back to the body.

The insulating film of the embodiment of the application can slow down the increase of the distance between two adjacent layers in the body, reduce the risk of lithium precipitation and improve the use reliability of the battery; in addition, the body abutting part and the lug abutting part are positioned on the same surface of the film body, and the processing and the manufacturing are convenient.

In one embodiment, the body pushing portion is connected to the tab pushing portion.

The insulating film of this application embodiment, the body is supported and is pushed the portion and the utmost point ear is supported and push the portion and meet and form a whole, and the body is supported and is pushed the portion and the utmost point ear is supported and push the portion and can butt in the connecting wire department of utmost point ear and body like this, has better restriction effect to the deformation offset of utmost point ear and body, slows down the effect of the interval grow between adjacent two-layer in the body better, and it is littleer to analyse the lithium risk, and the use reliability of battery is better.

In one embodiment, in the body abutting portion and the tab abutting portion, one of the body abutting portion and the tab abutting portion is located on a surface of the film body facing the body, and the other is located on a surface of the film body facing away from the body.

The insulating film of this application embodiment, the body is supported and is pushed portion and utmost point ear and support the relative both sides face that comes that pushes away the portion and be located the film body, and the thickness of multiplicable insulating film, the junction of utmost point ear and body can obtain better supporting effect, and the effect of the interval grow between adjacent two-layer in the body of slowing down is better, and the lithium risk of analyzing is littleer, and the reliability of battery use is better.

In one embodiment, the protruding structure comprises a body abutting portion and a tab abutting portion, the body abutting portion is located on the surface of the film body, which faces away from the body, and the body abutting portion is used for abutting against the inner wall of the shell; the lug abutting part is positioned on the surface of the film body facing the body and is used for abutting with the lug connecting area; or the lug abutting part is positioned on the surface of the film body back to the body and is used for pushing the film body to abut against the lug connecting area.

The insulating film of this application embodiment, utmost point ear support and push away the reliability of pushing away on utmost point ear joining region better, and the effect of the deformation skew of restriction utmost point ear is better, and the effect that slows down the interval grow between adjacent two-layer in the body is better, and the lithium of analyzing risk is littleer, and the reliability of battery use is better.

In one embodiment, a gap is formed between the body-facing surface of the membrane body and the body connection region.

The insulating film of the embodiment of the application, the gap between the film body and the body connecting area can provide an expansion space for the cyclic expansion of the body, the damage of an electrode assembly is reduced, and the use reliability of a battery is improved.

In one embodiment, the thickness of the tab pushing portion is greater than that of the body connecting area.

The insulating film of the embodiment of the application can reduce the damage risk of the electrode assembly in the circulation process on the basis that the distance between two adjacent layers in the body can be reduced.

In one embodiment, the thickness of the tab pushing part is 2mm to 3mm; and/or the thickness of the body pushing part is 0mm to 0.3mm.

The insulating film of the embodiment of the application can effectively reduce the interval between the adjacent two layers in the body and reduce the damage risk of the electrode assembly.

In one embodiment, the tabs include a positive tab and a negative tab; the lug pushing part is provided with an avoiding groove which is used for avoiding a connecting piece which is arranged between the positive lug and the negative lug on the top cover and is connected with the film body.

The insulating film provided by the embodiment of the application can avoid the interference of the lug abutting part and the connecting piece on the shell entering of the electrode assembly due to the arrangement of the avoiding groove.

In one embodiment, the tab pushing portion includes a positive tab pushing section and a negative tab pushing section located at two opposite sides of the avoiding groove, the positive tab pushing section is used for pushing a tab connection area formed on a positive tab, and the negative tab pushing section is used for pushing the tab connection area formed on a negative tab; the distance between the connecting pieces on the two opposite sides of the positive electrode lug on the top cover is L1, and the width of the positive electrode lug is L2; the length of the positive electrode lug pushing section is L3, wherein L2 is more than or equal to L3 is more than or equal to L1; and/or the distance between the connecting pieces positioned at the two opposite sides of the negative pole lug on the top cover is L4, and the width of the negative pole lug is L5; the length of the negative pole lug pushing section is L6, wherein L6 is more than or equal to L5 and less than or equal to L4.

The insulating film of the embodiment of the application can also avoid the influence on the shell entering of the electrode assembly caused by the interference of the connecting piece and the pole lug pushing part under the action of ensuring that the pole lug is stably and reliably pushed and supported.

In one embodiment, the length of the body pushing part is L7, the length of the tab pushing part is L8, and the width of the large surface of the body is L9, wherein L7 is greater than or equal to L8 and is less than or equal to L9.

The insulating film of the embodiment of the application can effectively slow down the space between the adjacent two layers in the body to be enlarged, reduces the phenomenon of lithium precipitation and improves the reliability of the battery.

In one embodiment, the height of the lug pushing part is D1, the height of the bending space of the lug is D2, and the thickness of a connecting piece used for being connected with the membrane body on the top cover is D3; wherein D1 is less than or equal to D2-D3, and/or D1 is more than or equal to 2mm.

The insulating film of this application embodiment, utmost point ear support and push away the portion and can not interfere with the connecting piece and influence electrode assembly's income shell, and in addition, utmost point ear supports to have sufficient support between pushing away portion and the utmost point ear and pushes away the area to can restrict the deformation skew of utmost point ear effectively, thereby slow down the interval grow between the adjacent two-layer in the body effectively, reduce the lithium phenomenon of analyzing, improve the use reliability of battery.

In one embodiment, the height of the body pushing part ranges from 0mm to 5mm.

The insulating film of this application embodiment, the body supports the high scope setting of pushing away the portion in above-mentioned within range, can guarantee that the body receives good support and pushes away the supporting role, and simultaneously, the body supports the portion of pushing away highly can not too much occupy the interior ascending space in Z direction of casing, is favorable to reducing the body circulation inflation in-process and supports the area of pushing away with the body of pushing away the portion, reduces the risk that the body is crushed, also is favorable to improving the energy density of battery.

In one embodiment, in the direction from the body pushing part to the tab pushing part, the part of the film body extending out of the tab pushing part is a connecting part, and the connecting part is used for being connected with a connecting piece on the top cover; the height range of the connecting part is 2mm-3mm.

According to the insulating film of the embodiment of the application, the height range of the connecting part is set in the range, so that the connecting part can be stably and reliably fixed on the connecting part, and the cover of the top cover cannot be influenced by too much redundancy after the connecting part is fixed on the connecting part; if the height of the connecting part is set to be too small, the connecting area of the connecting part and the connecting piece is small, the connecting part and the connecting piece are easy to separate, the fixing reliability of the insulating film is poor, and the use of the battery is seriously influenced; if the height of the connecting part is too large, the connecting part is fixedly connected with the connecting piece, and the connecting part has longer redundancy to influence the covering of the top cover, even the extrusion of the pole lugs and the body, and the use of the battery is seriously influenced.

In one embodiment, the protruding structure is an elastic structure.

According to the insulating film disclosed by the embodiment of the application, the protruding structure has certain elasticity, so that in the electrode assembly circulating process, the compressible body pushing part of the electrode assembly provides an expansion space, the risk that the electrode assembly is crushed is reduced, and the use reliability of a battery is improved.

In one embodiment, the protruding structure comprises a tab abutting portion, the tab abutting portion is located on the surface of the film body facing the body, an arc-shaped groove is formed in the surface of the tab abutting portion facing the tab, the arc-shaped groove is used for being matched with the shape of the tab connection area, and the groove wall of the arc-shaped groove is used for being abutted to the tab connection area.

The utility model provides an insulating film, utmost point ear joining region can laminate the butt mutually with the cell wall of arc wall, and utmost point ear support portion is big with the butt area of utmost point ear, and restriction utmost point ear deformation skew is effectual to can slow down the interval grow between adjacent two-layer in the body more reliably.

In one embodiment, the protruding structure and the membrane body are of an integrated structure; or the convex structure is adhered to the film body; or the convex structure is clamped on the film body.

The insulating film of the embodiment of the application is simple to manufacture and low in manufacturing cost.

In a second aspect, an embodiment of the present application provides a battery including the above-described insulating film.

The battery of this application embodiment adopts foretell insulating film, reduces the lithium of analysing of battery risk, improves the reliability that the battery used, also is favorable to improving the life of battery.

In a third aspect, an embodiment of the present application provides an electric device, which includes the above battery.

The power consumption device of the embodiment of the application adopts the battery, so that the reliability of the battery is high, the service life of the battery is long, and the improvement of the service reliability and the service life of the power consumption device is facilitated.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a battery according to an embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure.

Fig. 4 is a partial cross-sectional view of a battery cell provided in an embodiment of the present application.

Fig. 5 is a partial cross-sectional view of a battery cell provided in an embodiment of the present application.

Fig. 6 is a partial cross-sectional view of a battery cell provided in an embodiment of the present application.

Fig. 7 is a partial cross-sectional view of a battery cell provided in an embodiment of the present application.

Fig. 8 is a partial cross-sectional view of a battery cell provided in an embodiment of the present application.

Fig. 9 is a schematic view of the insulating film shown in fig. 8 from a perspective after it is developed.

Fig. 10 is a schematic view of the insulating film shown in fig. 8 from another viewing angle after it is developed.

Fig. 11 is a schematic view of the structure of fig. 8 from a further viewing angle after the insulating film is developed.

Fig. 12 is a schematic view showing a structure of the insulating film shown in fig. 8 from a further viewing angle after it is developed.

Fig. 13 is a schematic structural diagram of an expanded insulating film according to an embodiment of the present application.

Fig. 14 is a partial cross-sectional view of a battery cell provided in an embodiment of the present application.

Fig. 15 is an exploded view of the battery cell shown in fig. 14.

Fig. 16 is a schematic view of the structure of the insulating film, the top cap and the connection member shown in fig. 15.

Fig. 17 is a schematic view showing another perspective view of the insulating film shown in fig. 14 after being developed.

Fig. 18 is a schematic view showing a structure of the insulating film shown in fig. 14 from a further viewing angle after it is developed.

Fig. 19 is a schematic view of the structure of fig. 14 from a further viewing angle after the insulating film is developed.

Fig. 20 is a schematic view showing a structure of the insulating film shown in fig. 14 from a further viewing angle after it is developed.

Fig. 21 is a schematic view showing a structure of the insulating film shown in fig. 14 from a further viewing angle after it is developed.

Fig. 22 is a schematic view of the structure of fig. 14 from a further viewing angle after the insulating film is developed.

Wherein, in the figures, the respective reference numerals:

1000. a vehicle; 1100. a battery; 1200. a controller; 1300. a motor;

10. a box body; 11. a first portion; 12. a second portion; 20. a battery cell;

21. a top cover; 22. A housing; 23. a conductive member; 24. a connecting member; 241. a first connecting member; 242. a second connecting member; 243. a third connecting member;

100. an electrode assembly; 110. a body; 120. a tab; 121. a positive electrode tab; 122. a negative electrode tab;

111. a first side; 112. a second side surface; 113. a third side; 114. a fifth side surface; 115. a sixth side;

130. a connecting region; 131. a body attachment region; 132. a tab connection area;

200. an insulating film;

210. a membrane body; 211. a front film portion; 212. a rear film section; 213. a bottom film portion; 214. a first folded film portion; 215. a second folded film portion; 216. a third film folding part; 217. a fourth folded film portion;

2111. a connecting portion;

220. a raised structure;

221. a body pushing part; 222. a tab pushing part; 2221. a positive pole tab pushing section; 2222. a negative pole tab pushing section; 2201. an arc-shaped slot; 2202. avoiding the groove.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

Furthermore, the terms "first", "second" and "first" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In the description of the present application, it should be noted that the term "and/or" is only one kind of association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone.

It should be noted that, in the embodiments of the present application, the same reference numerals are used to refer to the same components or parts, and for the same parts in the embodiments of the present application, only one of the components or parts may be used as an example to refer to the reference numeral, and it should be understood that, for other similar components or parts, the reference numerals are also used.

In this application, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

At present, the application of power batteries is more and more extensive from the development of market conditions. 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 and electric automobiles, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The inventors found that one of the main causes of reliability problems with electrode assemblies is: the electrode assembly comprises a body and a tab, wherein the body is of a laminated electrochemical structure, the edge of at least part of layers in the body extends outwards to form the tab, the insulating film is coated outside the body, and the tab is exposed out of the insulating film; the electrode assembly coated with the insulating film is arranged in the shell, the tabs are connected to the top cover after being bent, and the top cover is fixed at the opening of the shell; however, because the space of the bending part of the lug is narrow, the lug is easily extruded by the top cover, and the body can be extruded by the extruded lug to deform and offset, so that the body is layered, and further the space between the adjacent two layers in the body is enlarged, and the problem of reliability such as lithium precipitation occurs.

In order to improve the reliability of the electrode assembly, the inventor designs an insulating film through intensive research, and the protruding structure is arranged on the insulating film, so that the deformation offset of the pole lug extruded by the top cover is reduced by utilizing the pushing effect of the protruding structure on the joint of the pole lug and the body, and/or the deformation offset of the body caused by the deformation offset of the pole lug extruded by the top cover is reduced, thereby slowing down the increase of the distance between two adjacent layers in the body, reducing the lithium precipitation risk, improving the reliability of the electrode assembly and improving the long-term reliability of a battery.

The insulating film disclosed in the embodiment of the present application can be used in, but not limited to, a battery and an electric device including the battery, and the electric device can be, but not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric vehicle, a train, a ship, a spacecraft, and the like. The electric vehicle may include a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc., the electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc. The power utilization device can also be an energy storage system, such as large-scale commercial energy storage, microgrid energy storage, base station products, household uninterruptible power supply energy storage, and the like.

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

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The interior of the vehicle 1000 is provided with a battery 1100, and the battery 1100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 1100 may be used for power supply of the vehicle 1000, and for example, the battery 1100 may serve as an operation power source of the vehicle 1000.

The vehicle 1000 may further include a controller 1200 and a motor 1300, the controller 1200 being configured to control the battery 1100 to power the motor 1300, for example, for start-up, navigation, and operational power requirements while traveling of the vehicle 1000.

In some embodiments of the present application, the battery 1100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery 1100 according to some embodiments of the present disclosure. The battery 1100 includes a case 10 and a battery cell, which is accommodated in the case 10. Wherein the case 10 is used to provide a receiving space for the battery unit, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and

second portions

11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 1100, the number of the battery cells may be multiple, and the multiple battery cells may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection of the multiple battery cells. Specifically, the battery unit may be a battery cell 20 or a battery module, wherein the battery module refers to a module component formed by assembling a plurality of battery cells 20.

In a specific embodiment, the plurality of battery cells 20 may be directly connected in series or in parallel or in series-parallel, and the whole body formed by the plurality of battery cells 20 is accommodated in the case 10; of course, the battery 1100 may also be formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and the whole is accommodated in the box 10. The battery 1100 may also include other structures, for example, the battery 1100 may also include a bus member for achieving electrical connection between the plurality of battery cells 20. Specifically, the battery unit may be a battery cell 20 or a battery module, wherein the battery module refers to a module component formed by assembling a plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 20 may be flat, rectangular, or other shapes, etc.

In the battery 1100, the number of the battery cells 20 may be multiple, and the multiple battery cells 20 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the multiple battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 20 is accommodated in the box body 10; of course, the battery 1100 may also be formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and the whole is accommodated in the box 10. The battery 1100 may also include other structures, for example, the battery 1100 may further include a bus member for achieving electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 20 may be cylindrical, flat, rectangular parallelepiped, or other shapes.

As another embodiment of the battery 1100, the battery 1100 may not include the case 10, but a plurality of battery cells 20 are electrically connected and integrated by a necessary fixing structure to be assembled into an electric device.

Referring to fig. 3, fig. 3 is an exploded schematic view of a battery cell 20 according to some embodiments of the present disclosure. The battery cell 20 refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 20 may include a top cap 21, a case 22, an electrode assembly 100, an insulating film 200, a conductive member 23, and other functional components.

The top cover 21 refers to a member that covers an opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the top cover 21 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the top cover 21 is not easily deformed when being impacted, and the battery cell 20 may have a higher structural strength and improved reliability. The top cover 21 may be provided with a functional member such as a pole. The electrode posts are used to electrically connect with the electrode assembly 100 for outputting or inputting electric energy of the battery cells 20. In some embodiments, a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value may be further disposed on the top cover 21. The top cover 21 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, an insulator may also be provided on the inside of the top cover 21, which may be used to isolate the electrical connections within the housing 22 from the top cover 21 to reduce the risk of short circuits. Illustratively, the insulator may be plastic, rubber, or the like.

The case 22 is an assembly for fitting the top cover 21 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 100, an electrolyte, and other components. The case 22 and the top cover 21 may be separate components, and an opening may be formed in the case 22, and the top cover 21 may cover the opening at the opening to form an internal environment of the battery cell 20. Without limitation, the top cover 21 and the housing 22 may be integrated, and specifically, the top cover 21 and the housing 22 may form a common connecting surface before other components are inserted into the housing, and when it is necessary to seal the interior of the housing 22, the top cover 21 covers the housing 22. The housing 22 may be a variety of shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 100. The material of the housing 22 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present invention is not limited thereto.

The electrode assembly 100 is a component in which electrochemical reactions occur in the battery cell. One or more electrode assemblies 100 may be contained within the case 22. The electrode assembly 100 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having the active material constitute the body 110 of the electrode assembly 100, and the portions of the positive and negative electrode sheets having no active material each constitute the tabs 120, which may be accomplished by a die cutting process or a laser cutting process. The tabs 120 generally include a positive tab 121 and a negative tab 122. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, the connecting member 24 electrically connects the tab 120 to the pole, and the tab 120 connects the pole to form a current loop.

The insulating film 200 is an insulating member covering the electrode assembly 100, and the insulating film 200 may function to reduce scratches of the electrode assembly 100 by the case 22 when the electrode assembly 100 is received in the case and to insulate the electrode assembly from the case 22. The insulating film 200 may also be referred to as a Mylar film, and may be made of a material having a good insulating property, such as PET (Polyethylene terephthalate). Wherein, one insulating film 200 may cover the outside of one or more electrode assemblies 100; two electrode assemblies 100 adjacently arranged in the thickness direction of the electrode assembly 100, and the insulating film 200 covers the two electrode assemblies 100 adjacently arranged, but not limited to this, the number of the electrode assemblies 100 is one, and may be three or more; when the number of the electrode assemblies 100 is plural, the insulating film 200 covers the plural electrode assemblies 100.

As shown in fig. 4, in one embodiment of the present application, there is provided an insulation film 200, the insulation film 200 being used with an electrode assembly 100, the electrode assembly 100 including a tab 120 and a body 110, the tab 120 being connected with an end of the body 110, the tab 120 extending outward of the body 110; the insulating film 200 includes a film body 210 and a protrusion structure 220, the film body 210 is used for covering the body 110; the convex structure 220 is connected with the membrane body 210 and protrudes out of the membrane body 210, and a connection region 130 is formed at the connection position of the body 110 and the tab 120; the protrusion structure 220 can push the connection region 130 toward the inside of the body 110 along the thickness direction of the body 110.

The body 110 refers to an electrochemical structure in a stacked arrangement, wherein the electrochemical structure refers to a structure of components in which electrochemical reactions occur, and the stacking refers to a structure in which components are stacked one on another, and the stacking is a concept of a structure herein, not a process concept, and not a limitation of a manufacturing process, and the electrode assembly 100 is necessarily stacked, for example, as described above, the electrode assembly 100 is mainly formed by winding or stacking the positive and negative electrode sheets, i.e., the stacked structure may be formed by a winding or stacking process. The positive and negative electrode tabs have portions of active material, and the separator constitutes the body 110 of the electrode assembly 100.

The tab 120 refers to a portion of the electrode assembly 100 that does not have an active material and extends out of the body 110, and for example, as described above, the portions of the positive and negative electrode sheets that do not have an active material each form the tab 120, and may be formed by a welding process, a die cutting process, or a laser cutting process.

The tab 120 is connected to an end of the body 110, the tab 120 extends outward from the body 110, and referring to fig. 3, the tab 120 is bent upward and extends from an upper end of the body 110, wherein, it should be noted that the tab 120 may be fixed to the body 110 by welding; the tab 120 may also be integrated with the body 110, and the upper edge of at least some layers of the body 110 may extend outward to form the tab 120, which may be implemented by a die cutting process or a laser cutting process. The body 110 is a laminated structure, the corresponding tab 120 is also a laminated structure, and for a general winding structure, the tab 120 is die-cut one by one circle after being wound on a pole piece; for a typical lamination stack, the pole pieces are die cut one tab 120 on top of the other; of course, the number of die-cut tabs 120 per week or layer may be adjusted as appropriate, where the number of layers is used in this sense, i.e., the number of layers of tabs 120 is related to the number of layers of laminated pole pieces.

The number of layers of the tab 120 may be the number of layers of the positive electrode tab 121 formed by the portion of the laminated positive electrode sheets having no active material forming the electrode assembly 100, or the number of layers of the negative electrode tab 122 formed by the portion of the laminated negative electrode sheets having no active material forming the electrode assembly 100. In one electrode assembly 100, the tabs 120 generally include a positive tab 121 and a negative tab 122, the positive tab 121 and the negative tab 122 are arranged at intervals along the width direction of the body 110, for example, as shown in fig. 3, two electrode assemblies 100 adjacently arranged along the thickness direction of the body 110 are arranged in the casing 22, and the two positive tabs 121 are distributed on two opposite sides of the two electrode assemblies 100 along the thickness direction of the body 110, which is beneficial to reducing the bending height of the tabs 120 and reducing the extrusion of the top cover 21 on the positive tabs 121 compared with the mode that the two positive tabs 121 are located on the same side; the two negative electrode tabs 122 are distributed on two opposite sides of the two electrode assemblies 100 along the thickness direction of the body 110, and this is compared with the mode that the two negative electrode tabs 122 are located on the same side, which is beneficial to reducing the bending height of the negative electrode tabs 122 and reducing the extrusion of the top cover 21 to the negative electrode tabs 122.

Referring to fig. 3, the body 110 has a thickness direction, a height direction and a width direction, wherein the X direction shown in fig. 3 is the thickness direction of the body 110, the Z direction is the height direction of the body 110, and the Y direction is the width direction of the body 110; for convenience of description, respective surfaces of two bodies 110 adjacently disposed in a thickness direction of the body 110 are defined as a first side 111, a second side 112, a third side 113, a fourth side (not illustrated), a fifth side 114, and a sixth side 115, and the first side 111 and the second side 112 are opposite sides of the body 110 in the thickness direction; the third side 113 and the fourth side are opposite sides of the body 110 in the height direction, and the fifth side 114 and the sixth side 115 are opposite sides of the body 110 in the width direction.

The film body 210 is a main body component covered outside the main body 110 on the insulating film 200; specifically, as shown in fig. 9 to 11 and fig. 17 to 20, the film body 210 has a thickness direction, a length direction, and a width direction after being developed, the X1 direction is the thickness direction of the film body 210 after being developed, the Y1 direction is the length direction of the film body 210 after being developed, and the Z1 direction is the width direction of the film body 210 after being developed. The film body 210 includes a front film portion 211, a rear film portion 212, a bottom film portion 213, a first folded film portion 214, a second folded film portion 215, a third folded film portion 216, and a fourth folded film portion 217; the front film portion 211, the bottom film portion 213, and the rear film portion 212 are sequentially connected in the width direction of the film body 210 after being unfolded; the first folded film portion 214 and the second folded film portion 215 are respectively connected to the front film portion 211 along opposite sides of the length direction of the film body 210 after being unfolded, the third folded film portion 216 and the fourth folded film portion 217 are respectively connected to the rear film portion 212 along opposite sides of the length direction of the film body 210 after being unfolded, the first folded film portion 214 and the fourth folded film portion 217 are located on the same side of the front film portion 211, and the second folded film portion 215 and the third folded film portion 216 are located on the same side of the front film portion 211.

The film body 210 is used for coating the body 110; it is understood that the membrane 210 covers the outer surface of the body 110 to insulate the body 110 from the housing 22; illustratively, as shown in fig. 3 and fig. 11, each part of the film body 210 is folded along the dotted line shown in fig. 11 and covers the body 110, the front film portion 211 and the rear film portion 212 respectively cover the first side surface 111 and the second side surface 112 of the body 110, the bottom film portion 213 covers the fourth side surface of the body 110, the second folded film portion 215 and the third folded film portion 216 are folded and connected to together cover the sixth side surface 115, and the first folded film portion 214 and the fourth folded film portion 217 are folded and connected to together cover the fifth side surface 114, so as to achieve the insulating coating of the body 110.

The bump structure 220 refers to a structure protruding above the surface of the film body 210 on the insulating film 200.

The junction of the body 110 and the tab 120 refers to a region where the body 110 and the tab 120 are connected, wherein the connection region 130 may be a partial region or a whole region in the region where the body 110 and the tab 120 are connected.

The protrusion structure 220 can push the connection region 130 toward the inside of the body 110 along the thickness direction of the body 110. For example, as shown in fig. 4, the protrusion structure 220 protrudes out of the surface of the film body 210, when the protrusion structure 220 is located on the surface of the film body 210 facing the body 110, after the film body 210 is wrapped outside the body 110, the protrusion structure 220 directly abuts against the connection point of the tab 120 and the body 110 by using the wrapping force of the film body 210, so as to push the connection region 130 toward the inside of the body 110 along the thickness direction of the body 110; or, when the protruding structure 220 is located on the surface of the film body 210 facing the body 110, after the film body 210 is wrapped outside the body 110 and then is installed in the housing 22, the inner wall film body 210 of the housing 22 further pushes the protruding structure 220 to abut on the connection region 130, so that the connection region 130 is pushed toward the inside of the body 110 along the thickness direction of the body 110; or, when the protruding structure 220 is located on the surface of the film body 210 opposite to the body 110, after the film body 210 is wrapped outside the body 110 and then is installed in the housing 22, the inner wall of the housing 22 pushes against the protruding structure 220, and the protruding structure 220 pushes against the film body 210 and abuts against the connection area 130, so that the connection area 130 is pushed towards the inside of the body 110 along the thickness direction of the body 110.

In the insulating film 200 of the embodiment of the present application, in use, after the film body 210 of the insulating film 200 is covered on the body 110 of the electrode assembly 100, and then the insulating film 200 and the electrode assembly 100 are installed in the case 22, the protruding structure 220 on the insulating film 200 is located between the inner wall of the case 22 and the electrode assembly 100; the connection region 130 is formed at the connection position of the body 110 and the tab 120, and the protruding structure 220 can push the connection region 130 towards the inside of the body 110 along the thickness direction of the body 110, that is, the protruding structure 220 can push the connection position of the body 110 and the tab 120 towards the inside of the body 110 along the thickness direction of the body 110, so that the protruding structure 220 can push and support the tab 120, and reduce the deformation offset of the top cover 21 pressing the tab 120, and the protruding structure 220 can also push and support the body 110, and reduce the deformation offset of the body 110 caused by the deformation offset of the tab 120, thereby reducing the distance between two adjacent layers in the body 110, reducing the risk of lithium precipitation, improving the reliability of the electrode assembly 100, and improving the long-term reliability of the battery.

In another embodiment, as shown in fig. 3, 4 and 9, the front film part 211 and the rear film part 212 are respectively provided with a protruding structure 220, and along the thickness direction of the body 110, the two protruding structures 220 clamp and push the connection portions of the tabs 120 and the body 110 at two opposite sides of the thickness direction of the body 110, so that the problem of the distance between two adjacent layers at two opposite sides of the thickness direction of the body 110 being increased can be effectively solved. More specifically, the two protruding structures 220 are symmetrically arranged, so that the two protruding structures 220 respectively push against the connecting portions of the tab 120 and the body 110, which are located at two opposite sides of the thickness direction of the body 110, in the same structure, so that the two protruding structures 220 can clamp two adjacently arranged electrode assemblies 100, and the effect of limiting deformation and offset is better. Of course, in other embodiments, the front film portion 211 is provided with two protruding structures 220, the two protruding structures 220 respectively abut against the connection between the corresponding positive electrode tab 121 and the body 110 and the connection between the corresponding negative electrode tab 122 and the body 110, and similarly, the rear film portion 212 is also provided with two protruding structures respectively abut against the connection between the corresponding positive electrode tab 121 and the body 110 and the connection between the corresponding negative electrode tab 122 and the body 110.

For convenience of description, the following convex structure 220 on the front film portion 211 is exemplified; of course, the protruding structure 220 on the rear film part 212 may be the same as or different from the protruding structure 220 on the front film part 211, and the specific configuration thereof may be set according to the distribution of the tabs 120 on the electrode assembly 100, which is not limited herein.

In another embodiment of the present application, as shown in fig. 4, 5 and 6 in combination, the connection region 130 of the insulation film 200 is provided to include a body connection region 131 and a tab connection region 132 connected to each other, the body connection region 131 is formed on the body 110, and the tab connection region 132 is formed on the tab 120; the projection structure 220 serves to push at least one of the tab connection region 132 and the body connection region 131 toward the inside of the body 110 in the thickness direction of the body 110.

The body connecting region 131 refers to a region of the body 110 that is pushed against the protrusion structure 220; as shown in fig. 3 and 4, the first side surface 111 and the second side surface 112 are each formed with a body connection region 131 to limit an amount of deformation displacement on opposite sides in the thickness direction of the body 110.

The tab connection region 132 refers to a region of the tab 120 that is pushed against the protrusion structure 220; as shown in fig. 3, tab connection regions 132 are formed on both the positive and

negative tabs

121 and 122 to limit the amount of bending deformation of the positive and

negative tabs

121 and 122.

The protrusion structure 220 is used for pushing at least one of the body connection region 131 and the tab connection region 132 toward the inside of the body 110 in the thickness direction of the body 110, and it can be understood that, as shown in fig. 4, the protrusion structure 220 pushes the tab connection region 132 toward the inside of the body 110 in the thickness direction of the body 110; alternatively, as shown in fig. 5, the protrusion 220 pushes the body connection region 131 toward the inside of the body 110 along the thickness direction of the body 110; alternatively, as shown in conjunction with fig. 8, the projection structure 220 is directed toward both the inner body connection region 131 and the tab connection region 132 of the body 110 in the thickness direction of the body 110.

The protruding structure 220 abuts against and pushes the tab connection region 132 towards the inside of the body 110 along the thickness direction of the body 110, so that the bending deformation offset of the tab 120 is limited, the increase of the distance between two adjacent layers of the body 110 is reduced, and the lithium precipitation risk is reduced.

The protruding structure 220 pushes against the body connection region 131 toward the inside of the body 110 along the thickness direction of the body 110, so that the deformation offset of the body 110 toward the housing 22 due to the bending of the tab 120 can be limited, the increase of the distance between two adjacent layers of the body 110 can be reduced, and the risk of lithium precipitation can be reduced.

Protruding structure 220 is simultaneously along the thickness direction of body 110 towards the inside body joining region 131 and the utmost point ear joining region 132 of body 110, protruding structure 220 can enough reduce the bending deformation offset of utmost point ear 120 like this, can also reduce the deformation offset of body 110, can slow down the interval grow between adjacent two-layer in the body 110 more reliably, reduces and educes the lithium risk.

The insulating film 200 of the embodiment of the application can slow down the distance between two adjacent layers in the body 110, reduce the risk of lithium precipitation and improve the reliability of the battery.

In another embodiment of the present application, the protruding structure 220 of the insulation film 200 is provided to include a body pushing part 221 and a tab pushing part 222; the body pushing portion 221 is configured to push the body connecting region 131 toward the inside of the body 110 along the thickness direction of the body 110; and/or the tab pushing part 222 is used to push the tab connection region 132 toward the inside of the body 110 in the thickness direction of the body 110.

The main body pushing portion 221 is a portion of the protruding structure 220 opposite to the main body 110 when the film body 210 covers the main body 110.

The tab pushing portion 222 is a portion of the protruding structure 220 opposite to the tab 120 when the film body 210 is wrapped on the body 110.

The body pushing portion 221 is configured to push the body connecting region 131 toward the inside of the body 110 along the thickness direction of the body 110; and/or the tab pushing part 222 is used to push the tab connection region 132 toward the inside of the body 110 in the thickness direction of the body 110. It can be understood that, as shown in fig. 5, the body pushing part 221 can push the body connecting area 131 toward the inside of the body 110 along the thickness direction of the body 110; alternatively, as shown in fig. 4, the tab pushing portion 222 can push the tab connection region 132 toward the inside of the body 110 along the thickness direction of the body 110; alternatively, as shown in fig. 8, the tab pushing part 222 can push the tab connecting area 132 toward the inside of the body 110 along the thickness direction of the body 110, and the body pushing part 221 can push the body connecting area 131 toward the inside of the body 110 along the thickness direction of the body 110.

The body pushing portion 221 can push the body connecting region 131 toward the inside of the body 110 along the thickness direction of the body 110, so as to limit the amount of deformation offset of the body 110 toward the casing 22 due to bending of the tab 120, thereby slowing down the increase of the distance between two adjacent layers of the body 110 and reducing the risk of lithium precipitation.

The tab abutting portion 222 can abut against the tab connection region 132 toward the inside of the body 110 along the thickness direction of the body 110, so as to limit the bending deformation offset of the tab 120, further reduce the increase of the distance between two adjacent layers of the body 110, and reduce the risk of lithium precipitation.

The tab pushing portion 222 can push the tab connection region 132 towards the inside of the body 110 along the thickness direction of the body 110, and the body pushing portion 221 can push the body connection region 131 towards the inside of the body 110 along the thickness direction of the body 110, so that the bending deformation offset of the tab 120 can be reduced, the deformation offset of the body 110 can be reduced, the increase of the distance between two adjacent layers in the body 110 can be more reliably reduced, and the risk of lithium precipitation is reduced.

The insulating film 200 of the embodiment of the application can slow down the distance between two adjacent layers in the body 110 to be enlarged, reduce the risk of lithium precipitation and improve the use reliability of the battery.

In another embodiment of the present application, the body pushing part 221 and the tab pushing part 222 of the insulating film 200 are provided on the surface of the film body 210 facing the body 110; alternatively, the body pushing portion 221 and the tab pushing portion 222 are both located on the surface of the film body 210 facing away from the body 110.

The body pushing part 221 and the tab pushing part 222 are both located on the surface of the film body 210 facing the body 110, so that after the film body 210 is coated on the body 110, the tab pushing part 222 can be directly abutted against the tab connection area 132 by using the coating force of the film body 210 to limit the deformation offset of the tab 120, and the body pushing part 221 can be directly abutted against the body connection area 131 by using the coating force of the film body 210 to limit the deformation offset of the body 110, at the moment, a gap can be formed between the film body 210 and the shell 22, and the gap can provide an expansion space for the body 110 in the circulation process, thereby reducing the damage risk of the electrode assembly 100; in addition, the body abutting portion 221 and the tab abutting portion 222 are located on the surface of the film body 210 facing the body 110, and the tab abutting portion 222 can directly abut against the tab connection region 132 by using the abutting force of the shell 22 to the film body 210, so as to limit the deformation offset of the tab 120; the body abutting portion 221 may abut directly on the body connecting region 131 by the abutting force of the housing 22 to the film body 210, so as to limit the deformation offset amount of the body 110.

The body abutting portion 221 and the tab abutting portion 222 are both located on the surface of the film body 210 opposite to the body 110, and the acting force of the shell 22 on the body abutting portion 221 can be used to push the film body 210 to abut on the body connecting region 131, so as to limit the deformation offset of the body 110; the acting force of the casing 22 on the tab pushing portion 222 can also be utilized to push the film body 210 to abut on the tab connection region 132, so as to limit the deformation offset of the tab 120, thereby alleviating the increase of the distance between two adjacent layers in the body 110 and reducing the lithium precipitation phenomenon. When the body abutting portion 221 and the tab abutting portion 222 are both located on the surface of the film body 210 facing away from the body 110, a gap may also be formed between the body abutting portion 221 and the tab abutting portion 222.

The insulating film 200 of the embodiment of the application can slow down the increase of the distance between two adjacent layers in the body 110, reduce the risk of lithium precipitation and improve the use reliability of the battery; in addition, the body pushing part 221 and the tab pushing part 222 are located on the same surface of the film body 210, which is also convenient for processing and manufacturing.

In another embodiment of the present application, the body pushing portion 221 and the tab pushing portion 222 of the insulating film 200 are provided to be connected.

The body abutting portion 221 is connected with the tab abutting portion 222, and it can be understood that the body abutting portion 221 and the tab abutting portion 222 are connected to form a whole, so that the body abutting portion 221 and the tab abutting portion 222 can abut against the connecting line of the tab 120 and the body 110, a better limiting effect is achieved on the deformation offset of the tab 120 and the body 110, the effect of slowing down the increase of the distance between two adjacent layers in the body 110 is better, the lithium analysis risk is smaller, and the use reliability of the battery is better.

In another embodiment of the present application, the insulation film 200 is provided in the body abutting portion 221 and the tab abutting portion 222, one of which is located on the surface of the film body 210 facing the body 110, and the other of which is located on the surface of the film body 210 facing away from the body 110; it can be understood that the body pushing part 221 and the tab pushing part 222 are located on two opposite sides of the film body 210; specifically, the body abutting portion 221 is located on the surface of the film body 210 facing the body 110, and the tab abutting portion 222 is located on the surface of the film body 210 facing away from the body 110; alternatively, the body pushing portion 221 is located on the surface of the film body 210 opposite to the body 110, and the tab pushing portion 222 is located on the surface of the film body 210 facing the body 110.

The insulating film 200 of the embodiment of the application, the body abutting part 221 and the tab abutting part 222 are located on the opposite side surfaces of the film body 210, the thickness of the insulating film 200 can be increased, the joint of the tab 120 and the body 110 can obtain a better supporting effect, the effect of increasing the distance between the two adjacent layers in the body 110 is better, the risk of lithium analysis is smaller, and the reliability of the battery use is better.

In another embodiment, as shown in fig. 7, the body pushing portion 221 is located on the surface of the film body 210 facing the body 110, and the tab pushing portion 222 is located on the surface of the film body 210 facing away from the body 110, so that the body pushing portion 221 abuts on the body connecting region 131; meanwhile, the tab abutting portion 222 abuts against the inner wall of the shell 22, and the tab abutting portion 222 also provides the body abutting portion 221 with an abutting force, so that the reliability of the body abutting portion 221 abutting against the body connecting region 131 is better, the effect of limiting the deformation and the deviation of the body 110 is better, the effect of slowing down the increase of the distance between two adjacent layers in the body 110 is better, the risk of lithium analysis is smaller, and the reliability of the battery use is better. It should be noted that, when the body abutting portion 221 abuts on the body abutting portion 221, the tab abutting portion 222 may abut on the tab connection region 132 by abutting the film body 210, so as to limit the deformation offset of the tab 120; or, the gap between the film body 210 and the tab connection region 132 pushed by the tab pushing portion 222 does not limit the amount of deformation offset of the tab 120, and the body pushing portion 221 limits the amount of deformation offset of the body 110, so as to achieve the effect of slowing down the increase of the distance between two adjacent layers in the body 110.

In another embodiment of the present application, as shown in fig. 14, the protruding structure 220 of the insulation film 200 is provided to include a body abutting portion 221 and a tab abutting portion 222, the body abutting portion 221 is located on a surface of the film body 210 facing away from the body 110, and the body abutting portion 221 is used for abutting against an inner wall of the housing 22; the tab abutting portion 222 is located on the surface of the film body 210 facing the body 110, and the tab abutting portion 222 is used for abutting against the tab connection region 132; alternatively, the tab pushing portion 222 is located on a surface of the film body 210 opposite to the body 110, and the tab pushing portion 222 is used for pushing the film body 210 to abut against the tab connection region 132.

It can be understood that the protrusion structure 220 includes a body abutting portion 221 and a tab abutting portion 222, the body abutting portion 221 is located on a surface of the film body 210 facing away from the body 110, and the body abutting portion 221 is used for abutting against an inner wall of the shell 22; the tab abutting portion 222 is located on the surface of the film body 210 facing the body 110, and the tab abutting portion 222 is used for abutting against the tab connection region 132; after the insulating film 200 and the electrode assembly 100 are inserted into the case, the tab pushing part 222 abuts on the tab connection region 132; meanwhile, the body abutting part 221 abuts against the inner wall of the shell 22, and the body abutting part 221 can also provide an abutting force for the tab abutting part 222, so that the reliability of the tab abutting part 222 abutting against the tab connecting area 132 is better, the effect of limiting deformation and deviation of the tab 120 is better, the effect of slowing down the increase of the distance between two adjacent layers in the body 110 is better, the lithium analysis risk is smaller, and the reliability of battery use is better. When the tab abutting portion 222 abuts on the tab connection region 132, the body abutting portion 221 can abut on the body connection region 131 by the film body 210, so as to limit the deformation offset of the body 110.

In an embodiment, the protrusion structure 220 includes a body abutting portion 221 and a tab abutting portion 222, the body abutting portion 221 is located on a surface of the film body 210 facing away from the body 110, and the body abutting portion 221 is used for abutting against an inner wall of the housing 22; the tab pushing part 222 is located on the surface of the film body 210 opposite to the body 110, and the tab pushing part 222 is used for pushing the film body 210 to abut against the tab connection area 132; after the insulating film 200 and the electrode assembly 100 are placed into the case, the inner wall of the case 22 pushes against the tab pushing portion 222, and the tab pushing portion 222 pushes against the film body 210 to abut against the tab connection region 132; meanwhile, the body abutting portion 221 abuts against the inner wall of the shell 22, and the body abutting portion 221 can provide an acting force for the tab abutting portion 222 to abut against the tab connection area 132, so that the tab abutting portion 222 has better reliability in abutting against and pushing in the tab connection area 132, better effect of limiting deformation and deviation of the tab 120, better effect of slowing down the increase of the distance between two adjacent layers in the body 110, less risk of lithium precipitation and better reliability of battery use. When the tab pushing portion 222 is abutted against the tab connection region 132, the body pushing portion 221 can push the film body 210 against the body connection region 131 to limit the deformation offset of the body 110.

The insulating film 200 of the embodiment of the application has the advantages that the reliability of the tab abutting and pushing part 222 abutting and pushing on the tab connecting area 132 is better, the effect of limiting the deformation and deviation of the tab 120 is better, the effect of slowing down the increase of the distance between the two adjacent layers in the body 110 is better, the lithium precipitation risk is smaller, and the reliability of the battery is better.

In another embodiment of the present application, referring to fig. 14, a gap is formed between the surface of the film body 210 of the insulation film 200 facing the body 110 and the body connection region 131, it can be understood that the film body 210 is not in contact with the body connection region 131, that is, the body pushing portion 221 does not act as a pushing and supporting function for the body connection region 131, and the deformation offset of the body 110 is not limited, but the deformation offset of the tab 120 is limited by the tab pushing portion 222, so that the effect of slowing down the increase of the distance between two adjacent layers in the body 110 can also be achieved.

The insulation film 200 of the embodiment of the present application, the gap between the film body 210 and the body connection region 131, can provide an expansion space for the cyclic expansion of the body 110, reduce the damage of the electrode assembly 100, and improve the reliability of the battery.

In another embodiment of the present application, as shown in fig. 8 and 12 in combination, the tab pushing part 222 of the insulator film 200 is provided with a thickness H1 greater than the thickness H2 of the body connection region 131. It can be understood that, with reference to fig. 8, the thickness of the tab pushing portion 222 refers to the length of the tab pushing portion 222 along the X direction, and the thickness of the body pushing portion 221 refers to the length of the body pushing portion 221 along the X direction; alternatively, as shown in fig. 12 and 13, the thickness of the tab pushing portion 222 is the length of the tab pushing portion 222 along the X1 direction, and the thickness of the body pushing portion 221 is the length of the body pushing portion 221 along the X1 direction.

The insulating film 200 of the embodiment of the application, the compressible space of utmost point ear 120 is big, the compressible space of body 110 is little, the thickness H1 that utmost point ear supported portion 222 is big, it is better to the support effect that pushes away of utmost point ear 120, the effect of interval grow between the adjacent two-layer in slowing down body 110 is better, and the thickness H2 that body supported portion 221 is little, can provide the inflation space in electrode subassembly 100's circulation inflation process, reduce body 110 crushing scheduling problem, the thickness H1 that the utmost point ear supported portion 222 is greater than the setting of the thickness H2 of body joining region 131, on the basis that can slow down interval grow between the adjacent two-layer in body 110, can also reduce the damage risk of electrode subassembly 100 in the circulation process.

In another embodiment of the present application, with reference to fig. 8 and 12, the tab pushing portion 222 of the insulating film 200 is provided with a thickness ranging from 2mm to 3mm; and/or the thickness range of the body pushing part 221 is 0mm to 0.3mm.

In one implementation, the thickness of the tab pushing portion 222 ranges from 2mm to 3mm.

The thickness H1 of the tab abutting portion 222 is set within the above range, so that the tab 120 can be stably and reliably abutted and supported, the distance between two adjacent layers in the body 110 can be effectively reduced, the lithium deposition phenomenon is reduced, and the use reliability of the battery is improved; if the thickness H1 of the tab abutting portion 222 is set too small, it is unable to perform a good abutting and supporting function on the tab 120, and unable to effectively solve the problem of large space between two adjacent layers in the body 110; if the thickness H1 of the tab abutting portion 222 is set too large, the abutting force of the tab abutting portion 222 on the tab 120 is too large, which may cause the tab 120 to be damaged. Specifically, the thickness H1 of the tab pushing part 222 may be 2mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, or 3mm.

In another implementation manner, the thickness of the main body pushing part 221 ranges from 0mm to 0.3mm. The thickness H2 of the body pushing part 221 is set within the above range, and the connection part of the tab 120 and the body 110 can be pushed, so that the distance between two adjacent layers in the body 110 is reduced, and the risk that the body 110 is crushed can also be reduced; if the thickness of the body pushing portion 221 is set too large, the body pushing portion 221 occupies a large space in the thickness direction of the body 110, the circular expansion space of the body 110 is small, and the body pushing portion 221 easily damages the body 110. Specifically, the thickness H2 of the body pushing part 221 may be 0mm, 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, or 0.3mm.

In another implementation manner, the thickness range of the tab pushing part 222 can be set to be 2mm to 3mm, and the thickness range of the body pushing part 221 is set to be 0mm to 0.3mm.

The insulating film 200 of the embodiment of the application can effectively reduce the increase of the distance between two adjacent layers in the body 110, and can also reduce the damage risk of the electrode assembly 100.

In another embodiment of the present application, as shown in fig. 3, 15, 16 and 17 in combination, the tabs 120 of the insulative film 200 are provided to include a positive tab 121 and a negative tab 122; the tab pushing part 222 is configured with an avoiding groove 2202, and the avoiding groove 2202 is used for avoiding the connecting piece 24 which is positioned between the positive electrode tab 121 and the negative electrode tab 122 on the top cover 21 and is used for connecting with the film body 210.

The connecting member 24 is a member disposed on the top cover 21 and used for connecting the film body 210, and as shown in fig. 3, 15, 16 and 17, the connecting member 24 may be a portion of the top cover 21 protruding toward the main body 110, specifically, the connecting member 24 may be a protruding portion on the lower plastic in the top cover 21, and the film body 210 may be fixed on the connecting member 24 by welding or the like, so as to fix the insulating film 200 in the housing 22.

The avoiding groove 2202 is a groove structure provided on the tab pushing portion 222, and the avoiding groove 2202 can accommodate the connecting member 24 to avoid interference between the tab pushing portion 222 and the connecting member 24 and influence on the insertion of the electrode assembly 100; specifically, as shown in fig. 17, the avoiding groove 2202 may penetrate through the tab abutting portion 222 along the Z1 direction, or the avoiding groove 2202 may not penetrate through the tab abutting portion 222 along the Z1 direction, which is specifically set according to the size of the connecting element 24 to ensure that the connecting element 24 does not interfere with the tab abutting portion 222, and is not limited herein.

The insulating film 200 according to the embodiment of the present invention is provided with the avoiding groove 2202, so that it is possible to prevent the interference between the tab abutting portion 222 and the connector 24 from affecting the insertion of the electrode assembly 100.

As shown in fig. 14, 15 and 16, three connectors 24 are disposed on the surface of the top cover 21 facing the body 110, the three connectors 24 are divided into a first connector 241, a second connector 242 and a third connector 243, the first connector 241, the second connector 242 and the third connector 243 are arranged at intervals along the width direction of the body 110, the positive electrode tab 121 is located between the first connector 241 and the second connector 242, the negative electrode tab 122 is located between the second connector 242 and the third connector 243, and the connectors 24 are disposed to provide a plurality of fixing points for the film body 210, so that the fixing effect of the film body 210 is better, wherein the second connector 242 can be accommodated in the avoiding groove 2202 to prevent the electrode tab pushing part 222 from interfering with the connector 24 to affect the case entering of the electrode assembly 100.

In another embodiment of the present application, as shown in fig. 3, fig. 15, fig. 16 and fig. 17, the tab pushing portion 222 of the insulation film 200 includes a positive tab pushing section 2221 and a negative tab pushing section 2222, the positive tab pushing section 2221 and the negative tab pushing section 2222 are respectively located at two opposite sides of the avoiding groove 2202, the positive tab pushing section 2221 is used for pushing the tab connection area 132 formed on the positive tab 121, and the negative tab pushing section 2222 is used for pushing the tab connection area 132 formed on the negative tab 122; the distance between the connecting pieces 24 on the top cover 21 and on the two opposite sides of the positive electrode tab 121 is L1, and the width of the positive electrode tab 121 is L2; the length of the positive electrode tab pushing section 2221 is L3, wherein L2 is equal to or greater than L3 is equal to or less than L1; and/or the distance between the connecting pieces 24 on the top cover 21 and on the two opposite sides of the negative electrode tab 122 is L4, and the width of the negative electrode tab 122 is L5; the length of the negative electrode tab pushing section 2222 is L6, wherein L6 is equal to or greater than L5 and equal to or less than L4.

The positive electrode tab pushing section 2221 refers to a portion of the tab pushing portion 222 for pushing against the tab connecting region 132 of the positive electrode tab 121.

The negative electrode tab pushing section 2222 refers to a portion of the tab pushing portion 222 for pushing against the tab connecting region 132 of the negative electrode tab 122.

The positive electrode tab pushing section 2221 and the negative electrode tab pushing section 2222 are located on two opposite sides of the avoiding groove 2202, respectively, and as shown in fig. 17, the positive electrode tab pushing section 2221 and the negative electrode tab pushing section 2222 are located on two opposite sides of the avoiding groove 2202 along the Y1 direction.

The distance between the connecting members 24 on the top cover 21 on opposite sides of the positive electrode tab 121 is L1, and it can be understood that, as shown in fig. 16, L1 is the distance between the first connecting member 241 and the second connecting member 242 in the Y direction.

The width of the positive electrode tab 121 is L2, and it is understood that L2 is the length dimension of the positive electrode tab 121 in the Y direction, as shown in fig. 16.

The length of the positive electrode tab pushing section 2221 is L3, and it can be understood that, as shown in fig. 18, L3 is the length dimension of the positive electrode tab pushing section 2221 in the Y1 direction.

L2 is greater than or equal to L3 and less than or equal to L1, it can be understood that the length L3 of the positive electrode tab pushing section 2221 is greater than or equal to the width L2 of the positive electrode tab 121, and the length L3 of the positive electrode tab pushing section 2221 is less than or equal to the distance L1 between the first connecting piece 241 and the second connecting piece 242; the length L3 of the positive electrode tab pushing section 2221 is greater than or equal to the width L3 of the positive electrode tab 121, the positive electrode tab 121 can be completely pushed by the positive electrode tab pushing section 2221 in the Y direction, and the positive electrode tab 121 can be stably and reliably pushed, so that the problem that the distance between two adjacent layers in the body 110 is increased is effectively solved; in addition, the length L3 of the positive electrode tab pushing section 2221 is less than or equal to the distance L1 between the first connecting member 241 and the second connecting member 242, the positive electrode tab pushing section 2221 can enter the space between the first connecting member 241 and the second connecting member 242, and the positive electrode tab 121 does not interfere with the first connecting member 241 and the second connecting member 242 to affect the case entering of the electrode assembly 100. Of course, in other embodiments, the length L3 of the positive electrode tab pushing section 2221 is smaller than the width L2 of the positive electrode tab 121, which may be selected according to actual situations, and is not limited herein.

The distance between the connectors 24 on the top cover 21 on opposite sides of the negative electrode tab 122 is L4, and it can be understood that L4 is the distance dimension between the second connector 242 and the third connector 243 in the Y direction as shown in fig. 16.

The width of the negative electrode tab 122 is L5; it is understood that, in conjunction with fig. 16, L5 is a length dimension of the negative electrode tab 122 in the Y direction.

The length of the negative electrode tab pushing section 2222 is L6, and it can be understood that, as shown in fig. 18, L6 is the length dimension of the negative electrode tab pushing section 2222 in the Y1 direction.

L5 is not less than L6 and not more than L4, it can be understood that the length L6 of the negative electrode tab pushing section 2222 is greater than or equal to the width L5 of the negative electrode tab 122, and the length L6 of the negative electrode tab pushing section 2222 is less than or equal to the distance L4 between the second connecting piece 242 and the third connecting piece 243, wherein the length L6 of the negative electrode tab pushing section 2222 is less than or equal to the width L5 of the negative electrode tab 122, the negative electrode tab 122 can be completely pushed by the negative electrode tab pushing section 2222 along the Y direction, and the negative electrode tab 122 can be stably and reliably pushed, thereby effectively solving the problem of the distance between two adjacent layers of the body 110; in addition, the length L6 of the negative electrode tab pushing section 2222 is less than or equal to the distance L4 between the second connecting member 242 and the third connecting member 243, the negative electrode tab pushing section 2222 can enter between the second connecting member 242 and the third connecting member 243, and the negative electrode tab 122 does not interfere with the first connecting member 241 and the second connecting member 242 to affect the case insertion of the electrode assembly 100. Of course, in other embodiments, the length L6 of the negative electrode tab pushing section 2222 may also be smaller than the width L5 of the negative electrode tab 122, which may be selected according to practical situations, and is not limited herein.

In one embodiment, the negative tab pushing section 2222 is used for pushing the tab connection region 132 formed on the negative tab 122; the distance between the connecting pieces 24 on the top cover 21 and on the two opposite sides of the positive electrode tab 121 is L1, and the width of the positive electrode tab 121 is L2; the length of the positive electrode tab pushing section 2221 is L3, wherein L2 is equal to or greater than L3 is equal to or less than L1; or, the distance between the connecting pieces 24 on the top cover 21 and on the two opposite sides of the negative electrode tab 122 is L4, and the width of the negative electrode tab 122 is L5; the length of the negative electrode tab pushing section 2222 is L6, wherein L6 is greater than or equal to L5 and less than or equal to L4; alternatively, the negative electrode tab pushing section 2222 is configured to push against the tab connection area 132 formed on the negative electrode tab 122; the distance between the connecting pieces 24 on the top cover 21 and on the two opposite sides of the positive electrode tab 121 is L1, and the width of the positive electrode tab 121 is L2; the length of the positive electrode tab pushing section 2221 is L3, the distance between the connecting pieces 24 on the top cover 21 at the two opposite sides of the negative electrode tab 122 is L4, and the width of the negative electrode tab 122 is L5; the length of the negative electrode tab pushing section 2222 is L6, wherein L3 is equal to or greater than L2 and equal to or less than L1, and L6 is equal to or greater than L5 and equal to or less than L4.

The insulating film 200 of the embodiment of the present application can also prevent the interference between the connecting member 24 and the tab pushing portion 222 from affecting the insertion of the electrode assembly 100 under the effect of ensuring the tab 120 to be stably and reliably pushed and supported.

In another embodiment of the present application, as shown in fig. 3, 18 and 20, the length of the body pushing portion 221 of the insulation film 200 is L7, the length of the tab pushing portion 222 is L8, and the width of the large surface of the body 110 is L9, wherein L7 is greater than or equal to L8 and less than or equal to L9.

The length of the body pushing portion 221 is L7, and it can be understood that, referring to fig. 20, L7 is the length of the body pushing portion 221 in the Y1 direction, or, in combination with fig. 16, L7 is the length of the body pushing portion 221 in the Y direction.

The length of the tab pushing part 222 is L8, and it can be understood that L8 is the length of the tab pushing part 222 in the Y1 direction, as shown in fig. 18. When the avoidance groove 2202 is formed in the tab pushing part 222, L8 includes a width L5 of the negative electrode tab 122, a width L2 of the positive electrode tab 121, and a width L10 of the avoidance groove 2202; as shown in fig. 18, L10 is a length of the relief groove 2202 in the Y1 direction.

The width of the large surface of the body 110 is L9, for example, as shown in fig. 3, L9 is the length dimension of the first side surface 111 along the Y direction, where it should be noted that if the body 110 is made in a winding manner, the first side surface 111 is a plane, and the fifth side surface 114 and the sixth side surface 115 are arc-shaped surfaces; the body 110 is formed in a laminated manner, and the length of the first side 111 in the Y direction is equal to the width of the body 110.

L8 is greater than or equal to L7 is greater than or equal to L9, it can be understood that the length L7 of the body pushing portion 221 is greater than or equal to the length L8 of the tab pushing portion 222, and the length L7 of the body pushing portion 221 is less than or equal to the width L9 of the large surface of the body 110; the length L7 of the body abutting part 221 is greater than or equal to the length L8 of the tab abutting part 222, and the joint of the positive electrode tab 121 and the body 110 and the joint of the negative electrode tab 122 and the body 110 can be completely abutted by the body abutting part 221 in the Y direction, so that the increase of the distance between two adjacent layers in the body 110 is effectively slowed down, the lithium separation phenomenon is reduced, and the reliability of the battery is improved; in addition, the length L7 of the body pushing portion 221 is less than or equal to the width L9 of the large surface of the body 110, and the body 110 can be completely pushed by the body pushing portion 221 in the Y direction, so that the increase of the distance between two adjacent layers in the body 110 in the Y direction can be effectively alleviated, the increase of the distance between two adjacent layers in the body 110 can be reliably alleviated, the lithium precipitation phenomenon can be reduced, and the reliability of the battery can be improved.

The insulating film 200 of the embodiment of the application can effectively slow down the distance between two adjacent layers in the body 110 to be enlarged, reduce the phenomenon of lithium precipitation and improve the use reliability of the battery.

In another embodiment of the present application, as shown in fig. 14, 18 and 20, the height of the tab pushing portion 222 of the insulation film 200 is D1, the height of the bending space of the tab 120 is D2, and the thickness of the connecting member 24 on the top cover 21 for connecting with the film body 210 is D3; wherein D1 is less than or equal to D2-D3, and/or D1 is more than or equal to 2mm.

The height of tab pushing portion 222 is D1, it can be understood that, referring to fig. 14, D1 is the length dimension of tab pushing portion 222 in the Z direction; alternatively, as shown in fig. 18, D1 is a length dimension of the tab pushing part 222 in the Z1 direction.

The height of the bending space of the tab 120 is D2, and it can be understood that, referring to fig. 14, D2 is the height difference between the surface of the top cover 21 facing the body 110 and the third side 113.

The thickness of the connecting piece 24 is D3; it will be appreciated that, referring to FIG. 14, D3 is the length dimension of the connector 24 in the Z direction.

In one implementation, D1 is not greater than D2-D3, it can be understood that the height D1 of the tab pushing portion 222 is not less than or equal to the difference between the height D2 of the bending space and the thickness D3 of the connecting member 24, so that the tab pushing portion 222 does not interfere with the connecting member 24 to affect the insertion of the electrode assembly 100.

In another implementation manner, D1 is greater than or equal to 2mm, it can be understood that the height D1 of the tab abutting portion 222 is greater than or equal to 2mm, so that a sufficient abutting area is provided between the tab abutting portion 222 and the tab 120, and the deformation and deviation of the tab 120 can be effectively limited, thereby effectively slowing down the increase of the distance between two adjacent layers in the body 110, reducing the phenomenon of lithium precipitation, and improving the use reliability of the battery.

In another implementation, 2mm ≦ D1 ≦ D2-D3;

in the insulating film 200 of the embodiment of the present application, the tab abutting portion 222 does not interfere with the connecting member 24 to affect the entrance of the electrode assembly 100, and meanwhile, the tab abutting portion 222 and the tab 120 have a sufficient abutting area, so as to effectively limit the deformation and offset of the tab 120, thereby effectively slowing down the increase of the distance between two adjacent layers in the body 110, reducing the lithium separation phenomenon, and improving the use reliability of the battery.

In another embodiment of the present application, as shown in fig. 14 and 20, the height of the body pushing part 221 of the insulating film 200 is provided in a range of 0mm to 5mm.

The height D4 of the body pushing portion 221, it can be understood that, as shown in fig. 14, the height D4 of the body pushing portion 221 refers to the length of the body pushing portion 221 in the Z direction; alternatively, as shown in fig. 20, the height D4 of the main body pushing part 221 is a length of the main body pushing part 221 in the Z1 direction.

In the insulating film 200 of the embodiment of the present application, the height range of the body abutting portion 221 is set in the above range, which can ensure that the body 110 receives a good abutting support effect, and meanwhile, the height of the body abutting portion 221 does not occupy too much space in the Z direction in the housing 22, which is beneficial to improving the energy density of the battery, and is also beneficial to reducing the abutting area between the body 110 and the body abutting portion 221 during the cyclic expansion process, and reducing the risk of crushing the body 110.

In another embodiment of the present application, the protruding structure 220 of the insulating film 200 is provided as an elastic structure.

The body pushing portion 221 is an elastic structure, and it can be understood that the protrusion structure 220 is made of an elastic material, specifically, the elastic material can be silica gel, rubber, or other materials. Specifically, at least one of the body abutting portion 221 and the tab abutting portion 222 is made of an elastic material.

In the insulating film 200 of the embodiment of the present application, the protrusion structures 220 have certain elasticity, so that the electrode assembly 100 can compress the protrusion structures 220 to provide an expansion space during the cycling of the electrode assembly 100, thereby reducing the risk of crushing the electrode assembly 100 and improving the use reliability of the battery.

In another embodiment of the present application, as shown in fig. 14 and 18, the insulating film 200 is provided, in the direction from the body abutting portion 221 to the tab abutting portion 222, a portion of the film body 210 extending out of the tab abutting portion 222 is a connection portion 2111, and the connection portion 2111 is used for connecting with the connecting member 24 on the top cover 21; the height range of the connecting part 2111 is 2mm to 3mm.

In the direction from the body pushing portion 221 to the tab pushing portion 222, it can be understood that, referring to fig. 14, the direction from the body pushing portion 221 to the tab pushing portion 222 can refer to the Z direction; alternatively, referring to fig. 18, the Z1 direction can be referred to as the direction from the body pushing portion 221 to the tab pushing portion 222.

The connection portion 2111 is a portion of the film body 210 extending out of the tab pushing portion 222 in the direction from the main body pushing portion 221 to the tab pushing portion 222, and the connection portion 2111 can be connected to the connection member 24 on the top cover 21 to fix the insulation film 200 in the housing 22.

The height D5 of the connection portion 2111, it being understood that, as shown in fig. 14, the height of the connection portion 2111 refers to the length dimension of the connection portion 2111 in the Z direction; alternatively, as shown in fig. 18, the height of the connection portion 2111 refers to the length of the connection portion 2111 in the Z1 direction.

In the insulating film 200 of the embodiment of the present application, the height range of the connection portion 2111 is set in the above range, so that the connection portion 2111 can be stably and reliably fixed to the connection portion 2111, and the connection portion 2111 is fixed to the connection portion 2111 without being redundant to affect the covering of the top cover 21; if the height of the connection portion 2111 is set too small, the connection area between the connection portion 2111 and the connection member 24 is small, the connection portion 2111 and the connection member 24 are easily separated, the fixing reliability of the insulating film 200 is poor, and the use of the battery is seriously affected; if the height of the connecting portion 2111 is set to be too large, the connecting portion 2111 is fixed on the connecting member 24, and the connecting portion 2111 has long redundancy to affect the covering of the top cover 21, even the extrusion of the tab 120 and the body 110, and the use of the battery.

In another embodiment of the present application, as shown in fig. 14 and 21, the protruding structure 220 of the insulation film 200 is provided to include a tab pushing portion 222, the tab pushing portion 222 is located on the surface of the film body 210 facing the body 110, the surface of the tab pushing portion 222 facing the tab 120 is configured with an arc-shaped groove 2201, the arc-shaped groove 2201 is used for adapting to the shape of the tab connection region 132, and the groove wall of the arc-shaped groove 2201 is used for abutting against the tab connection region 132.

The arc-shaped groove 2201 is used to match the shape of the tab connection region 132, and it is understood that the arc-shaped groove 2201 has the same shape or nearly the same shape as the bent portion of the tab 120.

The insulating film 200 of the embodiment of the application, the tab connection area 132 can be attached and abutted with the groove wall of the arc-shaped groove 2201, the abutting area of the tab abutting part 222 and the tab 120 is large, the deformation and deviation effects of the tab 120 are limited, and therefore the distance between two adjacent layers in the body 110 can be more reliably reduced.

In another embodiment of the present application, as shown in fig. 14 and 21 in combination, the protruding structure 220 of the insulating film 200 is provided as an integrated structure with the film body 210; alternatively, the protruding structure 220 is adhered to the film body 210; alternatively, the protrusion 220 is engaged with the film body 210.

The protrusion structure 220 and the membrane body 210 are an integrated structure, and it can be understood that the protrusion structure 220 and the membrane body 210 are manufactured by an integrated forming process, where the integrated forming refers to manufacturing and forming by using an integrated process such as extrusion, injection molding, and die casting. The protruding structure 220 and the film body 210 are integrated, so that the manufacturing process can be saved, the manufacturing cost can be reduced, and the connection reliability of the protruding structure 220 and the film body 210 is good.

The protruding structure 220 is adhered to the film body 210, and it is understood that the protruding structure 220 is adhered to the film body 210 by an adhesive, wherein the adhesive may be glue, structural glue, or the like. The protruding structure 220 and the film body 210 are connected by bonding, so that the connection operation is simple, and the manufacturing cost is reduced.

The protrusion structure 220 is engaged with the film body 210, and it can be understood that the protrusion structure 220 is connected with the film body 210 in an engaging manner, so that the connection operation is simple, and the manufacturing cost is reduced. Specifically, the film body 210 is provided with a clamping groove, and the protruding structure 220 is provided with a buckle which is clamped in the clamping groove; or, the protruding structure 220 is provided with a clamping groove, and the film body 210 is provided with a buckle which is clamped in the clamping groove. Of course, in other embodiments, there are other engaging means to connect the protrusion structure 220 and the film body 210, which are not described herein.

The insulating film 200 of the embodiment of the present application is simple to manufacture and low in manufacturing cost.

In an embodiment, as shown in fig. 4, the protruding structure 220 includes a tab pushing portion 222, the tab pushing portion 222 is disposed on a surface of the film body 210 facing the body 110, the tab pushing portion 222 is disposed on a surface facing the body 110 and has an arc-shaped groove 2201, and the tab connection region 132 abuts against a groove wall of the arc-shaped groove 2201, so as to limit the deformation and offset of the tab 120. The structure is simple, and the processing and the manufacturing are convenient.

In another embodiment, as shown in fig. 5, the protrusion structure 220 includes a body abutting portion 221, the body abutting portion 221 is disposed on a surface of the film body 210 facing the body 110, and the body abutting portion 221 abuts on the body connecting region 131, so as to limit the deformation and the offset of the body 110. The structure is simple, and the processing and the manufacturing are convenient.

In another embodiment, as shown in fig. 6, the protrusion structure 220 includes a tab pushing portion 222 and a body pushing portion 221, the tab pushing portion 222 and the body pushing portion 221 are both located on the surface of the film body 210 facing away from the body 110, the inner wall of the shell 22 pushes the tab pushing portion 222 and the body pushing portion 221, and the tab pushing portion 222 and the body pushing portion 221 push the film body 210 to abut on the tab connection region 132 and the body connection region 131, so as to simultaneously limit the deformation offset of the body 110 and the deformation offset of the tab 120.

In another embodiment, as shown in fig. 7, the protrusion structure 220 includes a tab abutting portion 222 and a body abutting portion 221, the tab abutting portion 222 is located on a surface of the film body 210 facing away from the body 110, the body abutting portion 221 is located on a surface of the film body 210 facing the body 110, the body abutting portion 221 abuts on the body connecting region 131 to limit the deformation and deviation of the body 110, and the tab abutting portion 222 abuts on the tab connecting region 132 to limit the deformation and deviation of the tab 120.

In another embodiment, as shown in fig. 8, the protrusion structure 220 includes a tab pushing portion 222 and a body pushing portion 221, the tab pushing portion 222 and the body pushing portion 221 are both located on the surface of the film body 210 facing the body 110, an arc-shaped groove 2201 is formed on the surface of the tab pushing portion 222 facing the body 110, the tab connection region 132 abuts against the groove wall of the arc-shaped groove 2201, and the body pushing portion 221 abuts against the body connection region 131, so as to limit the deformation offset of the body 110 and the deformation offset of the tab 120 at the same time.

In another embodiment, as shown in fig. 14, the protruding structure 220 includes a tab pushing portion 222 and a body pushing portion 221, the tab pushing portion 222 is located on the surface of the film body 210 facing the body 110, an arc-shaped groove 2201 is formed on the surface of the tab pushing portion 222 facing the body 110, and the tab connection region 132 abuts against and fits with the groove wall of the arc-shaped groove 2201 to limit the deformation and offset of the tab 120; the body pushing part 221 is located on the surface of the film body 210 opposite to the body 110, the inner wall of the shell 22 pushes the body pushing part 221, and the body pushing part 221 pushes the film body 210 to move towards the body 110, and meanwhile, the tab pushing part 222 also pushes the tab 120, so that the tab pushing part 222 can be stably and reliably abutted against the tab 120, and the effect of limiting the deformation and deviation of the tab 120 is better; in addition, a gap is formed between the abutting areas of the membrane body 210 and the body 110, and the gap can provide an expansion space for the cyclic expansion of the body 110, so that the damage of the body 110 is reduced.

In another embodiment of the present application, there is provided a battery including the insulating film 200 described above.

The battery of the embodiment of the application adopts the insulating film 200, so that the lithium precipitation risk of the battery is reduced, the use reliability of the battery is improved, and the service life of the battery is prolonged.

In another embodiment of the present application, there is provided an electric device including the battery described above.

Since the battery in the embodiment of the present application adopts all technical solutions of all the embodiments described above, all the beneficial effects brought by the technical solutions of the embodiments also exist, and are not described in detail herein.

Since the electric device in the embodiment of the present application adopts all technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are also achieved, and are not described in detail herein.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An insulating film for use with an electrode assembly, the electrode assembly including a tab and a body, the tab being connected to an end of the body and extending outwardly of the body; the method is characterized in that:

the insulating film comprises a film body and a protruding structure which is connected with the film body and protrudes out of the film body, and the film body is used for coating the body;

a connecting area is formed at the joint of the body and the tab;

the protruding structure can push the connecting area towards the inside of the body along the thickness direction of the body.

2. The insulating film according to claim 1, wherein: the connecting region comprises a body connecting region and a lug connecting region which are connected, the body connecting region is formed on the body, and the lug connecting region is formed on the lug;

the protruding structure is used for pushing against at least one of the tab connection area and the body connection area towards the inside of the body along the thickness direction of the body.

3. The insulating film according to claim 2, wherein: the protruding structure comprises a body abutting part and a lug abutting part;

the body pushing part is used for pushing the body connecting area towards the inside of the body along the thickness direction of the body; and/or the lug abutting part is used for abutting against the lug connecting area towards the inside of the body along the thickness direction of the body.

4. The insulating film according to claim 3, wherein: the body abutting part and the lug abutting part are both positioned on the surface of the film body facing the body; or the body abutting part and the lug abutting part are both positioned on the surface of the film body, which is back to the body.

5. The insulating film according to claim 4, wherein: the body abutting part is connected with the lug abutting part.

6. The insulating film according to claim 3, wherein: one of the body pushing part and the lug pushing part is positioned on the surface of the film body facing to the body, and the other one of the body pushing part and the lug pushing part is positioned on the surface of the film body back to the body.

7. The insulating film according to claim 3, wherein: the protruding structure comprises a body abutting part and a lug abutting part, the body abutting part is positioned on the surface of the membrane body, which is opposite to the body, and the body abutting part is used for abutting against the inner wall of the shell;

the tab pushing part is positioned on the surface of the film body facing the body and used for being abutted with the tab connecting area; or the lug abutting part is positioned on the surface of the film body, which is back to the body, and is used for abutting and pushing the film body and the lug connecting area.

8. The insulating film according to claim 7, wherein: a gap is formed between the surface of the membrane body facing the body and the body connecting area.

9. The insulating film according to any one of claims 3 to 8, wherein: the thickness of the lug pushing part is larger than that of the body connecting area.

10. The insulating film according to any one of claims 3 to 8, wherein: the thickness of the tab pushing part is 2mm-3mm; and/or the thickness of the body pushing part is 0mm to 0.3mm.

11. The insulating film according to any one of claims 3 to 8, wherein: the tabs comprise a positive tab and a negative tab;

the lug pushing part is provided with an avoiding groove, and the avoiding groove is used for avoiding a connecting piece which is arranged between the positive lug and the negative lug on the top cover and is connected with the film body.

12. The insulating film according to claim 11, wherein: the tab pushing part comprises a positive tab pushing section and a negative tab pushing section which are positioned at two opposite sides of the avoidance groove, the positive tab pushing section is used for pushing the tab connecting area formed on the positive tab, and the negative tab pushing section is used for pushing the tab connecting area formed on the negative tab;

the distance between the connecting pieces on the two opposite sides of the positive electrode lug on the top cover is L1, and the width of the positive electrode lug is L2; the length of the positive electrode lug pushing section is L3, wherein L2 is more than or equal to L3 and less than or equal to L1; and/or the distance between the connecting pieces positioned at two opposite sides of the negative pole lug on the top cover is L4, and the width of the negative pole lug is L5; the length of the negative pole lug pushing section is L6, wherein L6 is more than or equal to L5 and less than or equal to L4.

13. The insulating film according to any one of claims 3 to 8, wherein: the length of the body abutting part is L7, the length of the lug abutting part is L8, the width of the large surface of the body is L9, and L7 is not less than L8 and not more than L9.

14. The insulating film according to any one of claims 3 to 8, wherein: the height of the lug pushing part is D1, the height of the bending space of the lug is D2, and the thickness of a connecting piece used for being connected with the membrane body on the top cover is D3;

wherein D1 is not more than D2-D3; and/or D1 is more than or equal to 2mm.

15. The insulating film according to any one of claims 3 to 8, wherein: the height range of the body pushing part is 0mm to 5mm.

16. The insulating film according to any one of claims 3 to 8, wherein: along the direction from the body abutting part to the lug abutting part, the part of the membrane body extending out of the lug abutting part is a connecting part, and the connecting part is used for being connected with a connecting piece on the top cover; the height range of the connecting part is 2mm-3mm.

17. The insulating film according to any one of claims 1 to 8, wherein: the protruding structure is an elastic structure.

18. The insulating film according to any one of claims 2 to 8, wherein: the protruding structure comprises a lug pushing portion, the lug pushing portion is located on the surface, facing the body, of the film body, an arc-shaped groove is formed in the surface, facing the lug, of the lug pushing portion, the arc-shaped groove is used for being matched with the shape of the lug connection area, and the groove wall of the arc-shaped groove is used for being abutted to the lug connection area.

19. The insulating film according to any one of claims 1 to 8, wherein: the protruding structure and the membrane body are of an integrated structure;

or the convex structure is adhered to the film body;

or the protruding structure is clamped on the film body.

20. A battery, characterized by: comprising the insulating film of claim 19.

21. An electric device, characterized in that: comprising the battery of claim 20.