CN214848798U - Insulating film, battery cell, battery and electric equipment - Google Patents

Abstract

The embodiment of the application provides an insulating film, a single battery, a battery and electric equipment, wherein the insulating film comprises a bottom covering area and a plurality of side covering areas, and the number of the side covering areas is equal to the number of edges of the bottom covering area; the side covering area comprises a side covering area and a side overlapping area connected to two side edges of the side covering area, and the bottom edge of the side covering area is connected with one edge of the bottom covering area; the side covering areas are arranged on the same side of the bottom covering area to form an accommodating space; the adjacent side overlapping areas of the adjacent side covering areas are overlapped and fixed on the side covering area of one side covering area, so that the bottom of the accommodating space is closed. The insulating film provided by the embodiment of the application can achieve the waterproof purpose.

Description

Insulating film, battery cell, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to an insulating film, a battery monomer, a battery and electric equipment.

Background

With the increasing environmental pollution, the new energy industry is more and more concerned by people, and the lithium battery is used as an important component of many electronic products, energy storage products and electric vehicles, and the performance of the lithium battery directly influences the popularization and the application of related products. The lithium battery is classified according to the lithium battery outer packaging material, and the lithium battery can be mainly divided into a metal shell lithium battery and a soft package battery.

In the case of a metal-clad lithium battery, in order to prevent a short circuit of a case outside the metal-clad lithium battery, it is generally necessary to wrap an insulating film on the surface of the case of the metal-clad lithium battery.

However, the existing insulating film generally has a problem of water permeation after wrapping the battery, resulting in poor waterproof performance of the insulating film.

Disclosure of Invention

The application provides an insulating film, battery monomer, battery and consumer can improve the waterproof performance of insulating film.

A first aspect of the present application provides an insulating film including a bottom covering region and a plurality of side covering regions, the number of the side covering regions being equal to the number of sides of the bottom covering region; wherein the content of the first and second substances,

the side covering area comprises a side covering area and a side overlapping area connected with two side edges of the side covering area, and the bottom edge of the side covering area is connected with one edge of the bottom covering area;

the side covering areas are arranged on the same side of the bottom covering area to form an accommodating space;

and the adjacent side overlapping areas of the adjacent side covering areas are overlapped and fixed on the side covering area of one of the side covering areas so as to seal the bottom of the accommodating space.

In some embodiments, the side covering regions are integrally connected to the bottom covering region, and adjacent side covering regions are integrally connected.

In some embodiments, the length of the bottom edge of the side covering region is the same as the length of the corresponding edge of the bottom covering region, and the side covering regions are connected in alignment.

In some embodiments, adjacent said side overlapping regions are integrally connected.

In some embodiments, the side overlapping region is a triangular overlapping region, a first side of the triangular overlapping region is connected with the side covering region, and a second side bottom of the triangular overlapping region is integrally connected with a second side bottom of the adjacent side overlapping region.

In some embodiments, the second side of the triangular overlapping region is equal in length to the second side of the adjacent side overlapping region and is connected to the second side of the side overlapping region in alignment.

In some embodiments, the accommodating space is used for covering the battery cells or the battery module.

In some embodiments, the inner wall of the accommodating space is adhesively connected to the battery cell or the battery pack.

In some embodiments, when the accommodating space is used for covering the cuboid type battery cells, the adjacent side surface overlapping regions are overlapped and fixed on the side surface covering regions covering the front surfaces of the cuboid type battery cells to form protrusions on the front surfaces of the cuboid type battery cells.

In some embodiments, adjacent said side overlap regions of adjacent said side cover regions form a multi-layer embossment.

In some embodiments, the material of the insulating film is a waterproof material.

According to a second aspect of the present application, there is provided a battery cell comprising a case and the above-described insulating film; wherein the content of the first and second substances,

the bottom wall of the shell is covered with the bottom covering area of the insulating film, and the side wall of the shell is covered with the side covering area of the insulating film, so that the battery monomer is partially covered in the accommodating space of the insulating film.

According to a third aspect of the present application, there is provided a battery comprising a plurality of the above-described battery cells.

According to a fourth aspect of the present application, there is provided a battery including the above-described insulating film and a plurality of battery cells; wherein the content of the first and second substances,

the plurality of battery cells are wrapped in the accommodating space of the insulating film.

According to a fifth aspect of the present application, there is provided an electric device including: the battery is described above.

According to the insulating film provided by the embodiment of the application, the accommodating space is formed by enclosing the bottom covering area and the plurality of side covering areas by covering the battery monomer or the battery module; the bottom edge of the side covering area is connected with one side of the bottom covering area, the adjacent side overlapping areas of the adjacent side covering areas are overlapped and fixed on the side covering area of one side covering area, so that the bottom of the accommodating space can be sealed, the waterproof purpose is achieved, the space can be saved, and the cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.

Fig. 1-a is a schematic structural diagram of an electrical device according to an embodiment of the present disclosure.

Fig. 1-B is a schematic structural diagram of a battery according to an embodiment of the present disclosure.

Fig. 1-C is a schematic structural view of a battery module according to an embodiment of the present disclosure.

Fig. 1-D is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of an insulating film before being coated according to an embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of an insulating film coated according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of another insulating film before being coated according to the embodiment of the present application.

Fig. 5 is a schematic structural diagram of another insulating film before being coated according to the embodiment of the present application.

Fig. 6 is a schematic structural view of another insulation film-covered battery module according to an embodiment of the present application.

Fig. 7 is an exploded view of the structure of fig. 6 according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative of the present application, and are not intended to limit the scope of the present application, and therefore: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the description and claims of this application and the description of the figures are intended to cover non-exclusive inclusions.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Furthermore, the terms "first," "second," and the like in the description and claims of the present application or in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, and may explicitly or implicitly include one or more of the features.

In the description of the present application, unless otherwise specified, "plurality" means two or more (including two), and similarly, "plural groups" means two or more (including two).

In the description of the present application, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., "connected" or "connected" of a mechanical structure may refer to a physical connection, e.g., a physical connection may be a fixed connection, e.g., a fixed connection by a fastener, such as a screw, bolt, or other fastener; the physical connection can also be a detachable connection, such as a mutual clamping or clamping connection; the physical connection may also be an integral connection, for example, a connection made by welding, gluing or integrally forming the connection. "connected" or "connected" of circuit structures may mean not only physically connected but also electrically connected or signal-connected, for example, directly connected, i.e., physically connected, or indirectly connected through at least one intervening component, as long as the circuits are in communication, or communication between the interiors of two components; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

In order to clearly describe the respective orientations in the following embodiments, terms of orientation may be used, for example, the directions of the respective orientations of the battery are defined as a coordinate system in fig. 1-D, the x direction represents the length direction of the battery cell 400, the y direction is perpendicular to the x direction in the horizontal plane, represents the width direction of the battery cell 400, and the z direction is perpendicular to the x direction and the y direction, and represents the height direction of the battery. Further, the expressions of the directions indicated for explaining the operation and configuration of each member of the battery of the present embodiment, such as the x direction, the y direction, and the z direction, described above are not absolute but relative, and although these indications are appropriate when each member of the battery is in the position shown in the drawings, when the positions are changed, the directions should be interpreted differently to be changed correspondingly.

With the same orientation in mind, in the description of the present application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientation or positional relationship illustrated in the drawings for convenience in describing the present application and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present application.

The rechargeable battery may be referred to as a secondary battery or a power battery, and at present, a relatively widely used rechargeable battery is a lithium battery, for example, but not limited to, a lithium-sulfur battery, a sodium lithium-ion battery, or a magnesium-ion battery. For convenience of description, the rechargeable battery may be collectively referred to herein as a battery.

In the present application, a battery is generally formed by connecting and combining a plurality of battery cells, and the battery cells may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are also not limited in the embodiment of the application.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative pole mass flow body, and the negative pole mass flow body protrusion in the negative pole mass flow body of coating the negative pole active substance layer not coating the negative pole active substance layer, and the negative pole mass flow body of not coating the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The battery in the embodiment of the application can be applied to various electric devices which can provide power sources by electric energy. The electric device can be, but is not limited to, an electric automobile, an electric train, an electric bicycle, a golf cart, an unmanned aerial vehicle, a ship, or the like. The electric device may be a device powered by a battery alone or a hybrid device. The battery provides electric energy for the power consumption device to drive electric actuator through the motor and advance.

For example, as shown in fig. 1-a, which is a schematic structural diagram of an electric device according to an embodiment of the present application, the electric device may be an automobile, the automobile may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or an extended range automobile. The automobile includes a battery 200, a controller 210, and a motor 220. The battery 200 is used to supply power to the controller 210 and the motor 220 as an operation power source and a driving power source of the automobile, for example, the battery 200 is used for a power demand for operation at the start, navigation and running of the automobile. For example, the battery 200 supplies power to the controller 210, the controller 210 controls the battery 200 to supply power to the motor 220, and the motor 220 receives and uses the power of the battery 200 as a driving power source of the automobile, instead of or in part replacing fuel or natural gas to provide driving power for the automobile.

In order to achieve higher functions of the battery to meet the use requirement, the battery 200 may include a plurality of battery modules electrically connected to each other, as shown in fig. 1-B, the battery 200 includes a first case 201, a second case 202, and a plurality of battery modules 300, wherein the first case 201 and the second case 202 are fastened to each other, and the plurality of battery modules 300 are arranged in a space enclosed by the first case 201 and the second case 202. In some embodiments, the first case 201 and the second case 202 are hermetically connected.

As shown in fig. 1-C, the battery module 300 includes a plurality of battery cells 400, and the plurality of battery cells 400 may be electrically connected in series, in parallel, or in series-parallel to achieve a larger current or voltage, wherein the series-parallel refers to a combination of series connection and parallel connection. For example, as shown in fig. 1-C, the battery cells 400 may be placed upright, the height direction of the battery cells 400 coincides with the z-direction, the length direction of the battery cells 400 coincides with the x-direction, and a plurality of battery cells 400 are arranged side by side in the y-direction along the width direction thereof; alternatively, the battery cells 400 may be laid flat, the width direction of the battery cells 400 is consistent with the z direction, the length direction of the battery cells 400 is consistent with the x direction, and the plurality of battery cells 400 may be stacked in the z direction in at least one layer, each layer including a plurality of battery cells 400 arranged at intervals in the x direction.

In order to make it clear to those skilled in the art of the improvement of the present application, the overall structure of the battery cell 400 will be described first.

As shown in fig. 1-D, the battery cell 400 includes a case 40, an electrode assembly 30, and an end cap assembly 10, the end cap assembly 10 includes an end cap plate 10 ', the end cap plate 10' is connected (e.g., welded) to the case 40 to form a housing of the battery cell 400, the electrode assembly 30 is disposed in the case 40, and the case 40 is filled with an electrolyte. The battery cell 400 may have a cubic or rectangular parallelepiped shape.

The electrode assembly 30 may be provided singly or in plurality according to the actual use requirement. As shown in fig. 1-D, at least two independently wound electrode assemblies 30 may also be provided within the cell. The electrode assembly 30 may form the main body part by winding or stacking a first pole piece, a second pole piece, and a separator between the adjacent first and second pole pieces together, wherein the separator is an insulator between the adjacent first and second pole pieces. In this embodiment, the first pole piece is exemplarily described as a positive pole piece, and the second pole piece is a negative pole piece. The positive active material is coated on the coating region of the positive electrode tab, and the negative active material is coated on the coating region of the negative electrode tab. A plurality of uncoated regions extending from the coated region of the body portion are laminated as tabs. The electrode assembly 30 includes two tabs 301, i.e., a positive electrode tab and a negative electrode tab. The positive tab extends from the coated area of the positive pole piece and the negative tab extends from the coated area of the negative pole piece.

The end cap assembly 10 is disposed on top of the electrode assembly 30, and as shown in fig. 1-D, the end cap assembly 10 includes an end cap plate 10 'and two electrode terminals 5, the two electrode terminals 5 are a positive electrode terminal and a negative electrode terminal, respectively, one connecting member 20 is disposed corresponding to each electrode terminal 5, and the connecting member 20 is located between the end cap plate 10' and the electrode assembly 30.

For example, a tab 301 of the electrode assembly 30 is located at the top in fig. 1-D, and a positive tab is connected to a positive terminal through one connecting member 20 and a negative tab is connected to a negative terminal through the other connecting member 20. Alternatively, the battery cell 400 may include two end cap assemblies 10 disposed at both ends of the case 40, respectively, and one electrode terminal 5 is disposed on each of the end cap assemblies 10.

The end cover plate 10' may further be provided with an explosion-proof member, so that when too much gas is in the battery cell 400, the gas in the battery cell 400 is released in time to avoid explosion.

The end cover plate 10 'is provided with an exhaust hole which can be arranged at the middle position of the end cover plate 10' along the length direction. The explosion-proof component comprises a pressure relief mechanism 6, the pressure relief mechanism 6 is arranged on the exhaust hole, the pressure relief mechanism 6 is hermetically arranged on the exhaust hole in a normal state, when the single battery 400 expands to enable the air pressure in the shell to rise to exceed a preset value, the pressure relief mechanism 6 is actuated to be opened, and the air is released outwards through the pressure relief mechanism 6.

In some embodiments, as shown in fig. 1-D, the end cap plate 10 'is provided with a through hole for injecting an electrolyte into the battery cell 400, and the through hole may be a circular hole, an elliptical hole, a polygonal hole, or another hole, and may extend in the height direction of the end cap plate 10'. The end cover plate 10' is provided with a liquid injection member 2 for sealing the through hole.

As shown in fig. 2 and 3, an embodiment of the present application provides an insulating film for covering a battery cell 400, the insulating film 200 includes a bottom covering region 210 and a plurality of side covering regions 220, the bottom covering region 210 is used for covering the bottom of the battery cell 400; the plurality of side cover regions 220 are formed to cover the sides of the battery cells 400, the number of the side cover regions 220 is equal to the number of sides of the bottom cover region 210, and one side cover region 220 is connected to each side of the bottom cover region 210, thereby ensuring the connection between the bottom cover region 210 and the side cover regions 220.

The side cover region 220 provided in the embodiment of the present application includes a side cover region 221 and a side overlap region 222 connected to two side edges of the side cover region 221, wherein a bottom edge of the side cover region 221 is connected to one edge of the bottom cover region 210, so as to connect the bottom cover region 210 and the side cover region 220.

In the embodiment of the present invention, the plurality of side cover regions 220 are respectively disposed on the same side of the bottom cover region 210 to form an accommodating space. As shown in fig. 2, the receiving space is used to receive the battery cell 400.

The plurality of side cover regions 220 are disposed on the same side of the bottom cover region 210, the adjacent side overlap regions 222 of the adjacent side cover regions 220 overlap with each other, and the overlapping portion may be fixed to one of the side cover regions 221 of the adjacent side cover regions 220, so that the bottom of the receiving space is sealed to prevent water.

In the embodiment of the present application, the side covering regions 221 and the bottom covering region 210 are integrally connected, so that there is no gap between the side covering regions 221 and the bottom covering region 210, thereby preventing liquid such as water from flowing into the accommodating space between the side covering regions 221 and the bottom covering region 210.

Specifically, the length of the bottom edge of the side surface covering region 221 may be the same as the length of the corresponding edge of the bottom covering region 210, and the bottom edge and the corresponding edge of the bottom covering region 210 are aligned and connected, so that all the positions on each edge of the bottom covering region 210 are connected with the side surface covering region 221 as a whole, thereby preventing gaps from existing on the edges of the bottom covering region 210, and achieving the purpose of preliminary water resistance. The connection may be an adhesive connection or an integral molding, and this is not particularly limited in the embodiments of the present application.

On the basis of realizing the above-mentioned preliminary waterproof, in the embodiment of the present application, the adjacent side covering regions 220 are connected as an organic whole, specifically, the adjacent side overlapping regions 222 are connected as an organic whole, so that the side covering regions 220 are connected as an organic whole, and the purpose of further waterproofing is achieved.

Specifically, the adjacent side overlapping regions 222 may be completely connected into a whole, for example, the adjacent side overlapping regions 222 are connected from surface to surface; partial regions of the adjacent overlapping side regions 222 may be integrally connected, for example, edges of the adjacent overlapping side regions 222 may be integrally connected. The embodiment of the present application is not particularly limited to this. The specific manner of connecting the two components together is not limited.

In practical applications, the shape of the side overlapping region 222 may be various, such as triangular, other polygonal, etc. When the side overlapping area 222 is a triangular overlapping area, the first side 2221 of the triangular overlapping area is connected with the side covering area 221, and the bottom of the second side 2222 of the triangular overlapping area is connected with the bottom of the second side of the adjacent side overlapping area 222 into a whole, so that no gap is formed at the joint of the adjacent side covering areas 220, and the purpose of water proofing is achieved.

Specifically, the second side of the triangular overlapping region may be equal to the second side of the adjacent side overlapping region 222 and aligned with each other, so that no gap exists in the accommodating space.

It should be noted that, when the side overlapping region 222 is another polygon, one of two adjacent sides of the polygon may be connected to the side covering region 221, and the other side of the polygon needs to be connected to the adjacent side overlapping region 222, and the connection is ensured to be sealed, so that there is no water seepage at the bottom of the accommodating space.

In practical applications, in addition to the connection between different regions inside the insulating film 200, the inner wall of the accommodating space in the insulating film 200 needs to be adhesively connected with the battery cell 400, so that the relative fixation between the insulating film 200 and the battery cell 400 can be realized. Specific bonding sites are not particularly limited in the examples of the present application.

Fig. 2 and 3 show a case where the cubic battery cell 400 is covered with the insulating film 200. Fig. 4 and 5 show a case where the insulating film 200 covers the rectangular parallelepiped type battery cell 400, and unlike the case where the rectangular parallelepiped type battery cell 400 is covered with the insulating film 200, adjacent side surface overlapping regions 222 overlap each other when the rectangular parallelepiped type battery cell 400 is covered with the insulating film 200, and may be fixed on the side surface covering region 221 covering the front surface of the rectangular parallelepiped type battery cell 400 to form a protrusion 510 on the front surface of the rectangular parallelepiped type battery cell 400. The protrusion 510 may provide a space for the middle region of the battery cell 400 to expand, so as to prevent the battery cell 400 from being damaged by extrusion with the adjacent battery cell 400 due to expansion. The front surface of the rectangular parallelepiped battery cell 400 is a surface composed of the long sides of the rectangular parallelepiped battery cell 400 and the sides in the height direction, and may be referred to as the large surface of the rectangular parallelepiped battery cell 400.

In practical applications, the overlapped adjacent side overlapping regions 222 may be further folded and overlapped for multiple times, so that multiple layers of protrusions 510 may be formed to reserve more space for the middle region of the battery cell 400 to expand. Furthermore, a cushion pad or a heat insulation pad may be disposed on the front surface of the rectangular parallelepiped battery cell 400, which is not the protrusion 510, so that the failed battery cell 400 and the normal battery cell 400 may be isolated while protecting the battery cell 400.

Referring to fig. 6, in the embodiment of the present invention, the insulating film 200 may cover the battery module 300 composed of a plurality of battery cells, in addition to the battery cell 400, and the plurality of battery cells may be connected in different manners.

In practical use, the bottom footprint 210 of the insulating film 200 covers the bottom of the battery module 300; the plurality of side cover regions 220 cover the sides of the battery module 300, the number of the side cover regions 220 is equal to the number of sides of the bottom cover region 210, and one side cover region 220 is connected to each side of the bottom cover region 210, thereby ensuring the connection of the bottom cover region 210 and the side cover regions 220.

The specific structural form of the side surface covering region 220 is the same as that of the covering battery unit 400, and is not described herein again.

It should be noted that, in the process of covering the battery module 300, the specific fixing position of the protrusion 510 may not be considered, that is, the adjacent side overlapping regions 222 of the adjacent side covering regions 220 may overlap with each other, and the overlapping portion may be bent and fixed on any one of the side covering regions 221 of the adjacent side covering regions 220.

In the embodiment of the present invention, after the battery module 300 is covered with the insulating film 200, it is necessary to attach the fixing end plate 710 and the side plate 720 to the outer wall of the side surface of the insulating film 200 to position the insulating film 200 and prevent the insulating film 200 from being deformed.

In practical applications, in addition to the connection between the various regions inside the insulating film 200, the inner wall of the receiving space in the insulating film 200 needs to be adhesively connected to the battery module 300, so that the relative fixation between the insulating film 200 and the battery module 300 can be achieved. Wherein the insulating film 200 and the battery module 300 may be adhesively connected by a structural adhesive.

According to the embodiment of the application, the battery module 300 is coated by the insulating film 200, so that the insulating effect is achieved, meanwhile, the waterproof effect can be achieved, the cost is low, and the occupied space is small.

It should be emphasized that the material of the insulating film 200 is a waterproof material, for example, the insulating film 200 is formed by compounding a substrate and an adhesion layer, wherein the substrate can be a polymer material such as polyethylene, polypropylene, polyethylene terephthalate, polyamide, styrene-propylene copolymer, polystyrene, polyamide, etc.; the adhesion layer can be made of polymer materials such as acrylate, epoxy resin, polyurethane, amino resin, phenolic resin and the like.

In practical applications, the thickness of the insulating film 200 may be 25-400 um, and the thickness of the optional substrate may be 20-200 um, such as 50 um; the thickness of the adhesion layer can be 5-200 um, such as 20 um.

On the other hand, the present application also provides a battery cell, wherein the battery cell 400 comprises a housing and the insulating film 200, the bottom wall of the housing is covered with the bottom covering area of the insulating film 200, and the side wall of the housing is covered with the side covering area of the insulating film 200, so that the battery cell 400 is partially covered in the accommodating space of the insulating film 200. The specific structural form and the arrangement position of the insulating film 200 have been described in detail in the above embodiments, and the detailed description of the embodiment is omitted.

In another aspect, the present application further provides a battery including a plurality of the battery cells 400. The specific structural form of the battery cell 400 has been described in detail in the above embodiments, and details of this embodiment are not repeated.

To sum up, the battery that this application embodiment provided, through setting up foretell battery monomer, the outside cladding of the free casing of battery has the insulating film, plays insulating effect, when preventing that the battery monomer short circuit condition from taking place, can also play waterproof effect.

On the other hand, the present application further provides a battery, which includes the above-mentioned insulating film 200 and a plurality of battery cells, the plurality of battery cells are wrapped in the accommodating space of the insulating film 200, and the plurality of battery cells constitute the above-mentioned battery module 300. The specific structural form and connection relationship between the battery module 300 and the insulating film 200 have been described in detail in the above embodiments, and the description thereof is omitted in this embodiment.

On the other hand, the application also provides an electric device, which comprises the battery, wherein the battery is used for providing electric energy. The specific structural form and the working principle of the battery have been described in detail in the above embodiments, and this is not described again in this embodiment.

The above-mentioned subject matters and features of the embodiments of the present application can be referred to each other, and those skilled in the art can flexibly combine technical features of different embodiments to form further embodiments when the structure allows.

The insulating film, the battery cell, the battery and the electric device provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are merely provided to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims (15)

1. An insulating film, comprising a bottom covering region and a plurality of side covering regions, the number of side covering regions being equal to the number of sides of the bottom covering region; wherein the content of the first and second substances,

the side covering area comprises a side covering area and a side overlapping area connected with two side edges of the side covering area, and the bottom edge of the side covering area is connected with one edge of the bottom covering area;

the side covering areas are arranged on the same side of the bottom covering area to form an accommodating space;

and the adjacent side overlapping areas of the adjacent side covering areas are overlapped and fixed on the side covering area of one of the side covering areas so as to seal the bottom of the accommodating space.

2. The insulating film of claim 1, wherein the side cover regions are integrally connected to the bottom cover region, and adjacent side cover regions are integrally connected.

3. The insulating film of claim 2, wherein the length of the bottom edge of the side surface covering region is the same as the length of the corresponding edge of the bottom covering region, and the side surface covering regions are aligned and connected.

4. The insulating film according to claim 2, wherein adjacent side overlap regions are integrally connected.

5. The insulating film according to claim 1, wherein the side surface overlapping region is a triangular overlapping region, a first side of the triangular overlapping region is connected to the side surface covering region, and a second side bottom of the triangular overlapping region is integrally connected to a second side bottom of the adjacent side surface overlapping region.

6. The insulating film according to claim 5, wherein the second sides of the triangular overlapping regions are equal in length to and aligned with the second sides of the adjacent side overlapping regions.

7. The insulating film according to claim 1, wherein the receiving space is used to cover a battery cell or a battery module.

8. The insulating film according to claim 7, wherein an inner wall of the receiving space is adhesively connected to the battery cell or the battery module.

9. The insulating film according to claim 8, wherein when the receiving space is used to cover a rectangular parallelepiped battery cell, adjacent side surface overlapping regions are fixed in an overlapping manner on the side surface covering regions covering the front surfaces of the rectangular parallelepiped battery cells to form projections on the front surfaces of the rectangular parallelepiped battery cells.

10. The insulating film according to claim 9, wherein adjacent side overlap regions of adjacent side cover regions form a multi-layer projection.

11. The insulating film according to claim 1, wherein a material of the insulating film is a water-repellent material.

12. A battery cell comprising a case and the insulating film according to any one of claims 1 to 11; wherein the content of the first and second substances,

the bottom wall of the shell is covered with the bottom covering area of the insulating film, and the side wall of the shell is covered with the side covering area of the insulating film, so that the battery monomer is partially covered in the accommodating space of the insulating film.

13. A battery comprising a plurality of cells according to claim 12.

14. A battery comprising the insulating film according to any one of claims 1 to 11 and a plurality of battery cells; wherein the content of the first and second substances,

the plurality of battery cells are wrapped in the accommodating space of the insulating film.

15. An electrical device, comprising: a battery as claimed in claim 13 or 14.

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