CN215600459U - Insulating film, battery monomer, battery and consumer - 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 surface covering area and a plurality of first side surface covering areas and second side surface covering areas which are alternately arranged, the first side surface covering areas are connected to the short sides of the bottom surface covering area, and the second side surface covering areas are connected to the long sides of the bottom surface covering area; the first side covering area comprises a bottom covering part and two side overlapping parts, the bottom edge of the bottom covering part is connected with one edge of the bottom covering area, and the two side overlapping parts are respectively connected with two second side covering areas on two sides of the first side covering area; the bottom covering parts and the second side covering parts of the first side covering areas are positioned on the same side of the bottom covering area to form an accommodating space, and the two side overlapping parts are overlapped on the bottom covering parts to seal the bottom of the accommodating space. This application can reach waterproof purpose.

Description

Insulating film, battery monomer, battery and consumer

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 receiving more and more attention, and becomes an important component of many electronic products, energy storage products and electric vehicles as a rechargeable lithium ion secondary battery, and the performance of the rechargeable lithium ion secondary battery directly affects the popularization and use of related products.

In the case of a lithium ion battery, in order to prevent moisture from penetrating into the battery cell, a laminated material formed by compounding a layer of metal and two layers of plastic is generally used to wrap the battery cell.

However, the above method of wrapping the battery cells generally cannot solve the problem of waterproofing of the battery in the height direction, resulting in poor waterproofing performance of the lithium battery.

Disclosure of Invention

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

A first aspect of the present application provides an insulating film including a bottom surface covering region and a plurality of first side surface covering regions and second side surface covering regions alternately arranged, a sum of the number of the first side surface covering regions and the second side surface covering regions being equal to the number of sides of the bottom surface covering region, the first side surface covering region being connected to a short side of the bottom surface covering region, or the second side surface covering region being connected to a long side of the bottom surface covering region; wherein the content of the first and second substances,

the first side covering area comprises a bottom covering part and two side overlapping parts, the bottom edge of the bottom covering part is connected with the short edge of the bottom covering area, and the two side overlapping parts are respectively connected with two second side covering areas on two sides of the first side covering area;

the bottom covering parts and the second side covering parts of the first side covering areas are positioned on the same side of the bottom covering area to form an accommodating space, and the two side overlapping parts are overlapped on the bottom covering parts to seal the bottom of the accommodating space.

The first side covering areas and the second side covering areas which comprise the bottom covering parts and the two side overlapping parts are alternately arranged on the same side of the bottom covering area, and the bottom covering parts and the adjacent second side covering areas are combined with the bottom covering areas to form accommodating spaces for accommodating the battery units; in addition, the two side surface overlapping parts are overlapped on the bottom covering part, and the two side surface overlapping parts are respectively connected with the adjacent second side surface covering areas, so that the sealing effect on the accommodating space is realized, the waterproof performance of the insulating film can be improved, and the aim of preventing the battery from being waterproof is fulfilled.

In some embodiments, two side edges of the bottom cover portion are respectively connected to the two side overlapping portions.

Two side edges of the bottom shielding part are respectively connected with the two side surface overlapping parts, so that all parts in the insulating film can be connected into a whole, and the sealing performance of the accommodating space surrounded by the insulating film can be further improved.

In some embodiments, the bottom cover portion comprises a central region and first and second side regions attached to either side of the central region, a side of the first side region being attached to one of the side overlapping portions and a side of the second side region being attached to the other of the side overlapping portions;

the first side area, with the first side area links to each other the side overlap portion the second side area and with the second side area links to each other the side overlap portion all overlaps to be established on the middle zone.

The bottom cover portion and the two side overlapping portions can be connected into a whole through the connection of the side edge of the first side edge region and one of the side overlapping portions and the connection of the side edge of the second side edge region and the other side overlapping portion, and the sealing performance of the structure is improved. Meanwhile, the first side area, the second side area and the side overlapping part are overlapped on the middle area, so that the compactness of the structure can be increased, and the shape of the accommodating space is matched with the battery.

In some embodiments, the side overlap comprises a contiguous upper region and lower region, the lower region covering the entire first side region or the entire second side region;

or, the lower region covers a portion of the first side region or a portion of the second side region, and the rest of the first side region or the rest of the second side region is covered by the upper region.

The lower region partially covers the first side edge region or the second side edge region, and the rest of the first side edge region or the rest of the second side edge region is covered by the upper region, so that the outer sides of the first side edge region and the second side edge region are also provided with a side surface overlapping part, and the adhesive structure on the side surface overlapping part can play a role in fixing the side surface overlapping part on the middle region, thereby improving the firmness of the laminated structure and further improving the sealing property of the insulating film.

In some embodiments, the upper region, the lower region, and the adjacent second side-covering region are integrally connected.

In some embodiments, the sum of the lengths of the edges of the upper region, the lower region, and the second side covering region that are connected is the same as the length of the corresponding edge of the second side covering region, and is connected in alignment.

Through the mode of being connected as an organic whole and the sum of the lengths being equal, the gap between the side surface overlapping part and the second side surface covering area can be avoided, and the aim of water prevention is fulfilled.

In some embodiments, the upper region is rectangular and the lower region is triangular, the length of the side of the upper region connecting the lower region being greater than or equal to the length of the side of the lower region connecting the upper region.

In some embodiments, the side of the side overlapping part far from the second side covering area connected with the side overlapping part has a length less than a first preset length from the other second side covering area.

So as to ensure that a gap is left between the side overlapping part and the other second side covering area, and the overlapping and the later glue sealing of the whole first side covering area are convenient.

In some embodiments, the bottom edge of the bottom cover portion is the same length as the corresponding edge of the bottom cover portion and is aligned with the bottom cover portion.

The existence of a gap between the bottom covering part and the bottom covering area can be avoided to a certain extent, and the aim of water prevention is fulfilled.

In some embodiments, the bottom of the first side covering region is coated with a first cement structure, the bottom edge of the first cement structure is flush with the bottom edge of the first side covering region, and the side edge of the first cement structure is away from the side edge of the first side covering region by a second preset length.

The first glue structure serves the purpose of further sealing the bottom region of the insulating film.

In some embodiments, the height of the first cement structure is greater than the height of the bottom cover portion.

To ensure that the first cement structure can seal the bottom cover portion. So that the first glue structure serves the purpose of further sealing the bottom area of the insulating film.

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

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

The inner wall of the receiving space in the insulating film also needs to be adhesively connected to the battery module, so that a relative fixation of the insulating film to the battery module can be achieved.

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 cell and the above-described insulating film; wherein the content of the first and second substances,

the battery cell is provided with a shell, the bottom wall of the shell is covered with the bottom surface covering area of the insulating film, and the side wall of the shell is covered with the first side surface covering area and the second side surface covering area of the insulating film, so that the battery cell is at least 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 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;

and a second glue structure is coated on a first side surface covering area of the insulating film for coating the battery cells, and the second glue structure is used for connecting the adjacent battery cells.

In some embodiments, the second cement structure is located above the first cement structure of the insulating film in a height direction of the battery cell, and the second cement structure and the first cement structure are spaced by a predetermined distance.

In some embodiments, the viscosity of the second cement structure is greater than the viscosity of the first cement structure, and the water repellency of the second cement structure is lower than the water repellency of the first cement structure.

In some embodiments, the thickness of the second cement structure is greater than the thickness of the first cement structure.

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

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 according to an embodiment of the present application.

Fig. 3 is a schematic structural view of a first side surface covered region in the insulating film according to the embodiment of the present application.

Fig. 4 is a schematic structural diagram of another first side coverage area according to an embodiment of the present application.

Fig. 5 is a schematic structural view of an insulating film provided with a first cement structure according to an embodiment of the present application.

Fig. 6 is a schematic structural view of an insulating film provided with a second cement structure 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, where 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 vertically arranged, the height 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 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, at least one layer of the plurality of battery cells 400 may be stacked along the z direction, and each layer includes a plurality of battery cells 400 arranged at intervals along the x direction.

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

As shown in fig. 1-D, the battery cell 400 includes a battery cell including a casing 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 casing 40 to form a housing of the battery cell 400, the electrode assembly 30 is disposed in the casing 40, and the casing 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 respectively disposed at two ends of the casing 40, and each end cap assembly 10 is provided with one electrode terminal 5.

An explosion-proof component can be further disposed on the end cover plate 10', and when too much gas is in the battery cell 400, the gas in the battery cell 400 is released in time, so as 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 battery cell 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 electrolyte into the battery cell 400, and the through hole may be a circular hole, an elliptical hole, a polygonal hole or a hole with other shapes, and may extend along 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 including a bottom surface covering region 210 and a plurality of first side surface covering regions 220 and second side surface covering regions 230 alternately arranged, the bottom surface covering region 210 being configured to cover a bottom of the battery cell 400; a plurality of first side coverage areas 220 and second side coverage areas 230 are alternately arranged to cover the sides of the battery cell 400, the sum of the number of the first side coverage areas 220 and the number of the second side coverage areas 230 is equal to the number of the sides of the bottom coverage area 210, and each side of the bottom coverage area 210 is connected to one first side coverage area 220 or one second side coverage area 230, specifically, the first side coverage area 220 is connected to the short side of the bottom coverage area 210, and the second side coverage area 230 is connected to the long side of the bottom coverage area 210, so as to ensure that the bottom coverage area 210 is substantially seamlessly connected to the first side coverage area 220 and the second side coverage area 230.

In the embodiment of the present application, a plurality of first side coverage areas 220 and second side coverage areas 230 are located on the same side of the bottom coverage area 210 to form a receiving space. As shown in fig. 2, the accommodation space is used to accommodate the battery cell 400.

In the embodiment of the present application, the first side coverage area 220 includes a bottom cover portion 221 and two side overlapping portions 222, wherein a bottom edge of the bottom cover portion 221 is connected to one edge, for example, a short edge, of the bottom coverage area 210, so as to connect the bottom coverage area 210 and the first side coverage area 220; two side overlapping portions 222 are respectively connected to two second side covering regions 230 on both sides of the first side covering region 220 to realize the connection of the first side covering region 220 and the second side covering region 230.

Further, the bottom cover portions 221 and the second side cover portions 230 of the plurality of first side cover portions 220 are located on the same side of the bottom cover portion 210 to form an accommodating space, and the two side overlapping portions 222 are stacked on the bottom cover portions 221 to seal the bottom of the accommodating space, so that a waterproof effect can be achieved.

According to the insulating film provided by the embodiment of the application, the first side coverage areas 220 and the second side coverage areas 230, which comprise the bottom cover portion 221 and the two side overlapping portions 222, are alternately arranged on the same side of the bottom coverage area 210, and the bottom cover portion 221 and the adjacent second side coverage area 230, in combination with the bottom coverage area 210, can form a containing space for containing a battery cell; in addition, by overlapping the two side overlapping portions 222 on the bottom covering portion 221, the two side overlapping portions 222 are respectively connected to the adjacent second side covering regions 230, so that the accommodating space is sealed, the waterproof performance of the insulating film can be improved, and the purpose of waterproofing the battery cell is achieved.

In practical applications, the connection manner and the stacking manner may be determined according to actual situations. For example, the bottom cover portion 221 and the second side cover portion 230 are respectively connected with the bottom cover portion 210, and the side overlapping portion 222 is connected with the second side cover portion 230; in addition, the overlapping side surface 222 may be provided on one surface of the bottom cover portion 221 by an adhesive structure, so as to be overlapped on the bottom cover portion 221 by an adhesive method.

In the embodiment of the application, in order to fix the battery cell in the accommodating space of the insulating film, an adhesive structure can be arranged on one side of the insulating film close to the accommodating space, so that the insulating film is adhered to the battery cell. Of course, any other way that the cell can be fixedly connected with the insulating film falls within the protection scope of the present application.

In the embodiment of the present application, two side edges of the bottom cover portion 221 are respectively connected to the two side overlapping portions 222, so that each portion of the insulating film can be connected into a whole, and the sealing performance of the accommodating space surrounded by the insulating film can be further increased.

Referring to fig. 3, the bottom cover portion 221 includes a middle region 2211, and a first side region 2212 and a second side region 2213 connected to both sides of the middle region 2211, a side of the first side region 2212 is connected to one of the side overlapping portions 222, and a side of the second side region 2213 is connected to the other side overlapping portion 222. The first side area 2212, the side overlapping portion 222 connected to the first side area 2212, the second side area 2213, and the side overlapping portion 222 connected to the second side area 2213 are all stacked on the middle area 2211.

The bottom cover portion 221 and the two side overlapping portions 222 can be connected into a whole by connecting the side edge of the first side edge region 2212 with one of the side overlapping portions 222 and connecting the side edge of the second side edge region 2213 with the other side overlapping portion 222, so that the sealing performance of the structure is improved. Meanwhile, the first side edge region 2212, the second side edge region 2213 and the side overlapping portion 222 are stacked on the middle region 2211, so that the compactness of the structure can be increased, and the shape of the accommodating space is ensured to be matched with the battery core.

In addition, the middle area 2211 and one side of the side overlapping portion 222 close to the battery core are coated with an adhesive structure, so that the stacked structure can be fixed on the battery core to achieve the purposes of fixing and sealing.

In practical applications, the specific structural forms of the bottom cover portion 221 and the side overlapping portion 222 may be set in various ways according to actual needs, and the embodiment of the present application provides a schematic structural diagram of another insulating film as shown in fig. 4 in addition to the insulating film structure shown in fig. 3.

In the insulating film provided in fig. 4, the side overlapping portion 222 includes an upper region 2221 and a lower region 2222 connected to each other, in which the lower region 2222 covers a part of the first side region 2212 or a part of the second side region 2213, and the rest of the first side region 2212 or the rest of the second side region 2213 is covered by the upper region 2221.

With respect to the insulating film provided in fig. 3, the lower region 2222 covers the entire first side edge region 2212 or the entire second side edge region 2213.

In contrast to the structure of the insulating film shown in fig. 3, in the insulating film shown in fig. 4, the first side edge region 2212 and the second side edge region 2213 further have the side overlapping portion 222, and the adhesive structure on the side overlapping portion 222 can serve to fix the side overlapping portion 222 to the middle region 2211, thereby improving the firmness of the stacked structure and further improving the sealing property of the insulating film.

In order to improve the waterproof property of the insulating film and ensure the integration of the respective parts in the insulating film, the upper region 2221 and the lower region 2222 are integrated with the adjacent second side surface covering regions 230. Also, the sum of the lengths of the sides of the upper area 2221, the lower area 2222 connected to the second side footprint 230 is the same as the length of the corresponding sides of the second side footprint 230, and are connected in alignment. Therefore, a gap between the side overlapping part 222 and the second side covering area 230 can be avoided, and the purpose of water resistance is achieved. The connection may be an adhesive connection or an integral molding, and this is not particularly limited in the embodiments of the present application.

In an alternative implementation of the embodiment of the present application, the upper area 2221 may be rectangular, the lower area 2222 may be triangular, and the length of the side of the upper area 2221 connected to the lower area 2222 is greater than or equal to the length of the side of the lower area 2222 connected to the upper area 2221. Fig. 3 shows a case where the upper region 2221 and the lower region 2222 are connected on the same side, and fig. 4 shows a case where the upper region 2221 has a side length larger than that of the lower region 2222 at the connection point.

It should be noted that, the upper area 2221 and the lower area 2222 may have other structural forms besides the above structural form, for example, a trapezoid, a polygon, etc., and different structural forms may be provided according to actual situations and requirements, which is not limited in this embodiment of the present invention.

Referring to fig. 5, the side of the side overlapping portion 222 away from the second side covering region 230 connected thereto has a length D less than a first preset length from another second side covering region 230. To ensure a gap is left between the side overlapping portion 222 and the other second side covering region 230, so as to facilitate the overlapping and the later sealing of the whole first side covering region 220.

In the embodiment of the present application, in order to further seal the stacked structure, as shown in fig. 5, the bottom of the first side covering region 220 is coated with a first glue structure 510, the bottom edge of the first glue structure 510 is flush with the bottom edge of the first side covering region 220, and the side edge of the first glue structure 510 is spaced from the side edge of the first side covering region 220 by a second preset length. The second predetermined length is required to be smaller than the first predetermined length, so as to ensure that a part of the first glue structure 510 covers the side of the side overlapping portion 222, and the purpose of sealing the side overlapping portion 222 is achieved.

In addition, the height of the first cement structure 510 needs to be larger than the height of the bottom cover portion 221 so as to determine that the first cement structure 510 can seal the bottom cover portion 221. So that the first paste structure 510 serves the purpose of further sealing the bottom region of the insulating film.

In an implementation manner of the embodiment of the present application, the material of the first cement structure 510 may be:

similarly, in order to improve the waterproof property of the insulating film and ensure the integration of the components in the insulating film, the bottom edge of the bottom cover portion 221 has the same length as the corresponding edge of the bottom cover region 210, and is aligned and connected. Therefore, a gap between the bottom cover portion 221 and the bottom surface covering region 210 can be avoided, and the waterproof purpose is achieved.

In the embodiment of the present application, the height of the insulating film is greater than the height of the battery cell 400, and specifically, the heights of the first side surface covering region 220 and the second side surface covering region 230 are greater than the height of the battery cell 400, so as to achieve the purpose of waterproofing the whole battery cell 400 in the height direction.

In practical application, besides the connection relationship among different parts in the insulating film, the inner wall of the accommodating space in the insulating film is required to be connected with the battery cell in an adhesion manner, so that the insulating film and the battery cell can be relatively fixed. Specific bonding sites and bonding methods are not particularly limited in the examples of the present application.

In the embodiment of the present application, the accommodating space of the insulating film may further cover the battery module 300 formed by a plurality of battery cells, besides the battery cells, and the battery cells may be connected in different manners.

In the actual wrapping of the battery module 300, the bottom surface covering region 210 of the insulating film covers the bottom of the battery module 300; the plurality of first and second side covering regions 220 and 230 cover the sides of the battery module 300, and the battery module 300 is housed in the receiving space.

The specific structural form of the insulating film is the same as that of the coating cell 400, and will not be described herein again. Furthermore, the inner wall of the receiving space in the insulating film is also required to be adhesively connected to the battery module 300, so that the insulating film and the battery module 300 can be relatively fixed.

According to the embodiment of the application, the battery core 400 or the battery module 300 is coated by the insulating film, 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 is a waterproof material, for example, the insulating film 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-acrylate 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 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 embodiment of the present application also provides a battery cell, the battery cell includes a battery cell and the above-mentioned insulating film, as shown in fig. 4, the battery cell 400 has a casing, a bottom wall 401 of the casing is covered with a bottom covering area of the insulating film, and a side wall 402 of the casing is covered with a first side covering area and a second side covering area of the insulating film, so that the battery cell is at least partially covered in a containing space of the insulating film. The specific structural form and the arrangement position of the insulating film 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, which includes a plurality of the above-mentioned battery cells. The specific structural form of the battery cell 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 electric core in the battery monomer has the insulating film, plays insulating effect, when preventing that the electric core short circuit condition from taking place, can also play waterproof effect.

On the other hand, this application still provides a battery, including foretell insulating film and a plurality of electric core, a plurality of electric core cladding are in the accommodation space of insulating film, and the electric core interconnect who cladding has the insulating film.

Referring to fig. 6, a first side coverage area of an insulating film for covering the battery cells 400 is coated with a second gel structure 610, and the second gel structure 610 is used to connect adjacent battery cells 400.

In the height direction of the battery cell 400, the second glue structure 610 is located above the first glue structure 510 of the insulating film, and the second glue structure 610 and the first glue structure 510 are spaced by a predetermined distance, so that the second glue structure 610 with a large strength is prevented from pulling the first glue structure 510 to tear the first glue structure 510.

In one implementation of the embodiment of the present application, the viscosity of the second cement structure 610 is greater than the viscosity of the first cement structure 510, and the water repellency of the second cement structure 610 is lower than the water repellency of the first cement structure 510. The first glue structure 510 mainly plays a role of waterproof sealing, and the second glue structure 610 mainly plays a role of connection fixing.

In one embodiment of the present embodiment, to test the water resistance of the second adhesive structure 610, the battery was placed in a metal container containing 0.3-3.5% saline, the height of which was 2-5 mm lower than the total height of the battery; the resistance of the battery may then be measured using a multimeter and if the measured resistance is greater than a preset threshold, such as 1Mohm, the water resistance of the second cement structure 610 is determined to be satisfactory.

Specifically, in the process of measuring the resistance of the multimeter, one end of the stylus can be placed on the surface of the metal cover of the battery, the other end of the stylus can be placed on the surface of the metal container, 0.1V voltage is applied, and the resistance result is recorded, so that the resistance measurement can be completed.

In addition, in order to avoid adhesion between the first cement structures 510 corresponding to the adjacent battery cells 400, the thickness of the second cement structure 610 is greater than that of the first cement structure 510. The specific thickness can be determined according to actual conditions, and the embodiment of the present application is not particularly limited in this respect.

In one embodiment of the present embodiment, the material of the second adhesive structure 610 may be at least one of polyurethane and epoxy resin or a mixture of the two.

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 (21)

1. An insulating film, comprising a bottom surface covering region and a plurality of first side surface covering regions and second side surface covering regions alternately arranged, the sum of the number of the first side surface covering regions and the second side surface covering regions being equal to the number of sides of the bottom surface covering region, the first side surface covering regions being connected to the short sides of the bottom surface covering regions, or the second side surface covering regions being connected to the long sides of the bottom surface covering regions; wherein the content of the first and second substances,

the first side covering area comprises a bottom covering part and two side overlapping parts, the bottom edge of the bottom covering part is connected with the short edge of the bottom covering area, and the two side overlapping parts are respectively connected with two second side covering areas on two sides of the first side covering area;

the bottom covering parts and the second side covering parts of the first side covering areas are positioned on the same side of the bottom covering area to form an accommodating space, and the two side overlapping parts are overlapped on the bottom covering parts to seal the bottom of the accommodating space.

2. The insulating film according to claim 1, wherein both side edges of the bottom cover portion connect the two side overlapping portions, respectively.

3. The insulating film according to claim 2, wherein the bottom cover portion comprises a middle region and a first side region and a second side region connected to both sides of the middle region, a side of the first side region being connected to one of the side overlapping portions, and a side of the second side region being connected to the other of the side overlapping portions;

the first side area, with the first side area links to each other the side overlap portion the second side area and with the second side area links to each other the side overlap portion all overlaps to be established on the middle zone.

4. The insulating film according to claim 3, wherein the side surface overlapping portion includes an upper region and a lower region connected, the lower region covering the entire first side edge region or the entire second side edge region;

or, the lower region covers a portion of the first side region or a portion of the second side region, and the rest of the first side region or the rest of the second side region is covered by the upper region.

5. The insulating film of claim 4, wherein the upper region, the lower region and the adjacent second side-covering region are integrally connected.

6. The insulating film according to claim 5, wherein a sum of lengths of sides of the upper region, the lower region and the second side surface covering region, which are connected to each other, is equal to a length of a side corresponding to the second side surface covering region, and is connected in alignment.

7. The insulating film according to any one of claims 4 to 6, wherein the upper region has a rectangular shape, the lower region has a triangular shape, and a length of a side of the upper region connecting the lower region is greater than or equal to a length of a side of the lower region connecting the upper region.

8. The insulating film according to any one of claims 1 to 6, wherein a length of an edge of the side overlapping portion away from the second side covering region connected thereto from the other second side covering region is less than a first preset length.

9. The insulating film according to any one of claims 1 to 6, wherein the bottom edge of the bottom cover portion and the corresponding edge of the bottom surface covering region have the same length and are aligned and connected.

10. The insulating film according to any one of claims 1 to 6, wherein a bottom of the first side surface covering region is coated with a first cement structure having a base flush with a base of the first side surface covering region, and a side edge of the first cement structure is provided with a second predetermined length from a side edge of the first side surface covering region.

11. The insulating film according to claim 10, wherein a height of the first cement structure is larger than a height of the bottom cap portion.

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

13. The insulating film of claim 12, wherein an inner wall of the receiving space is adhesively connected to the cell or the battery module.

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

15. A battery cell comprising a cell and the insulating film of any one of claims 1-14; wherein the content of the first and second substances,

the battery cell is provided with a shell, the bottom wall of the shell is covered with the bottom surface covering area of the insulating film, and the side wall of the shell is covered with the first side surface covering area and the second side surface covering area of the insulating film, so that the battery cell is at least partially covered in the accommodating space of the insulating film.

16. A battery comprising a plurality of cells according to claim 15.

17. A battery comprising the insulating film according to any one of claims 1 to 14 and a plurality of 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;

and a second glue structure is coated on a first side surface covering area of the insulating film for coating the battery cells, and the second glue structure is used for connecting the adjacent battery cells.

18. The battery of claim 17, wherein the second cement structure is located above the first cement structure of the insulating film in a height direction of the cell, and the second cement structure and the first cement structure are spaced apart by a predetermined distance.

19. The battery of claim 18, wherein the viscosity of the second cement structure is greater than the viscosity of the first cement structure, and the water repellency of the second cement structure is lower than the water repellency of the first cement structure.

20. The battery of claim 18 or 19, wherein the thickness of the second cement structure is greater than the thickness of the first cement structure.

21. An electrical device, comprising: the battery of any one of claims 16-20.

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