Insulating film, battery monomer and battery

Abstract

The embodiment of the utility model provides an insulating film, a battery monomer and a battery, and relates to the field of energy storage. Wherein two opposite surfaces of the insulating film are an inner surface and an outer surface, and the inner surface of the insulating film is used for covering an electrode assembly of the battery monomer. The insulating film is provided with an inner and outer identification part which is used for identifying the inner surface and the outer surface. According to the insulating film, the battery monomer and the battery, the internal and external identification parts of the insulating film can assist in identifying whether the insulating film is reversely mounted, so that correct mounting of the insulating film is ensured.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of energy storage, in particular to an insulation film, a battery cell and a battery. BACKGROUND

[0002] With the continuous development of new energy technology, battery cells such as lithium ion batteries and lithium polymer batteries are increasingly widely used in electric vehicles, portable electronic devices and other power consumption devices. The safety and reliability of battery cells are also increasingly required.

[0003] As a key component in the packaging of battery cells, the insulation film can cover the electrode assembly inside the battery cell, thereby separating the electrode assembly and the shell of the battery cell to prevent short circuit of the battery cell, which can cause battery failure or safety accidents.

[0004] However, the existing insulation film has a single structure, which is prone to misassembly or reverse assembly during assembly, affecting the production efficiency of the battery and potentially threatening the performance and safety of the battery. Therefore, how to correctly install the insulation film has become a technical problem to be solved. Practical new type content

[0005] In view of the above problems, embodiments of the present application provide an insulation film, which is provided with an inside-outside identification part. The inside-outside identification part can assist in identifying whether the insulation film is installed reversely, thereby ensuring correct installation of the insulation film. Embodiments of the present application also provide a battery cell and a battery provided with the insulation film.

[0006] In one aspect of embodiments of the present application, an insulation film is provided, which is applied to a battery cell. The insulation film has an inner surface and an outer surface on opposite sides. The inner surface of the insulation film is used to cover the electrode assembly of the battery cell. The insulation film is provided with an inside-outside identification part, which is used to identify the inner surface and the outer surface.

[0007] The inside-outside identification part of the insulation film can assist in identifying the inner surface and the outer surface of the insulation film, thereby ensuring correct installation of the insulation film, reducing the probability of installation error of the insulation film and improving the installation efficiency of the insulation film.

[0008] In an optional manner, the inside-outside identification part includes a first identification part and a second identification part. The first identification part and the second identification part are spaced apart on the insulation film. The visible profile of the first identification part is different from the visible profile of the second identification part.

[0009] In this manner, the visible profiles of the first identification part and the second identification part of the insulation film are different. The inner surface and the outer surface of the insulation film can be more easily identified through the first identification part and the second identification part, thereby further ensuring correct installation of the insulation film.

[0010] In an alternative, the relative positions of the first identification part and the second identification part can be flipped along with the insulating film.

[0011] In this way, the relative positions of the first identification part and the second identification part are opposite when the insulating film is correctly installed and when the insulating film is installed upside down, so that the relative positions of the first identification part and the second identification part can also assist in identifying the inner surface and the outer surface of the insulating film, making identification more convenient and further ensuring correct installation of the insulating film.

[0012] In an alternative, the insulating film includes a plurality of insulating film partitions. The first identification part and the second identification part are respectively arranged on two insulating film partitions, and the insulating film partition provided with the first identification part is separated from the insulating film partition provided with the second identification part by another insulating film partition.

[0013] In this way, the first identification part and the second identification part are respectively arranged on different insulating film partitions, which is convenient to process, has obvious differences, is easy to compare and view, and has strong visibility.

[0014] In an alternative, the first identification part is a round corner chamfer arranged at the outer edge of the insulating film, and the second identification part is an inclined corner chamfer arranged at the outer edge of the insulating film.

[0015] In this way, the round corner chamfer and the inclined corner chamfer have simple structures and are convenient to process. Moreover, the round corner chamfer and the inclined corner chamfer have obvious differences and are easy for a user to identify. In addition, the corners of the outer edge of the insulating film are arranged as the round corner chamfer and the inclined corner chamfer, so that the insulating film is not easy to have a raised and folded edge when covering the electrode assembly and being loaded into the shell.

[0016] In an alternative, the inner and outer identification part includes a plurality of liquid suction holes, and the plurality of liquid suction holes are asymmetrically arranged on the insulating film. The liquid suction holes are used for electrolyte or gas to pass through.

[0017] In this way, the insulating film is provided with the liquid suction holes, which can supply electrolyte when the insulating film is installed, and is conducive to smooth installation of the insulating film. Moreover, the insulating film can supply the gas generated inside the battery monomer to pass through, which is conducive to gas discharge when the battery monomer is used. In addition, the plurality of liquid suction holes arranged asymmetrically can present an incorrect arrangement mode when the insulating film is installed upside down, which can assist in identifying the inner surface and the outer surface of the insulating film, making identification more convenient and further ensuring correct installation of the insulating film.

[0018] In an alternative, the insulating film includes a plurality of insulating film partitions. A score line is arranged between each two adjacent insulating film partitions, so that each two adjacent insulating film partitions can be bent relative to the score line.

[0019] In this way, the scribe line can provide a guide when the insulating film partitions are bent, so that the bending area between two adjacent insulating film partitions is concentrated near the scribe line, so that the shape of the bent insulating film is more regular, and the bending process is easier to achieve.

[0020] In an alternative way, the scribe line is a virtual line formed by punching.

[0021] In this way, the scribe line can provide a guide when the insulating film partitions are bent, so that the bending area between two adjacent insulating film partitions is concentrated near the scribe line, so that the shape of the bent insulating film is more regular, and the bending process is easier to achieve.

[0022] In an alternative way, the insulating film is provided with a positioning hole for fixing and installing the insulating film through the positioning hole.

[0023] In this way, the insulating film is provided with a positioning hole, which facilitates the positioning and installation of the insulating film relative to other insulating parts, ensures the installation accuracy of the insulating film, and is less likely to have a large installation error.

[0024] Another aspect of the embodiments of the present application provides a battery monomer, which comprises an electrode assembly, a shell, and the above-mentioned insulating film. The insulating film is located between the electrode assembly and the shell, and the inner surface of the insulating film covers the electrode assembly to separate the electrode assembly and the shell.

[0025] The insulating film of the battery monomer is provided with an inside-out identification part, which can assist in identifying whether the insulating film is installed reversely, thereby ensuring the correct installation of the insulating film and improving the accuracy and efficiency of the assembly of the battery monomer.

[0026] Another aspect of the embodiments of the present application also provides a battery, which comprises a plurality of the above-mentioned battery monomers.

[0027] The battery has battery monomers, and the insulating film is provided in these battery monomers. The insulating film is provided with an inside-out identification part, which can assist in identifying whether the insulating film is installed reversely, thereby ensuring the correct installation of the insulating film, improving the accuracy and efficiency of the assembly of the battery monomer, and thereby reducing the overall assembly cycle of the battery.

[0028] The insulating film, the battery monomer, and the battery provided by the embodiments of the present application are provided with an inside-out identification part on the insulating film. When the insulating film is installed, the operator can accurately identify the inner surface and the outer surface of the insulating film through the inside-out identification part, thereby avoiding the situation that the insulating film is installed reversely, ensuring the correct installation of the insulating film, and being conducive to improving the efficiency when the insulating film is installed.

[0029] The above description is only a summary of the technical solutions of the embodiments of the present application. In order to make the technical means of the embodiments of the present application more clearly understood, the embodiments can be implemented according to the content of the description. In order to make the above and other purposes, features and advantages of the embodiments of the present application more apparent and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 A structural schematic diagram of an insulating film according to an embodiment of the present application when the outer surface is outward.

[0032] Figure 2 A structural schematic diagram of an insulating film according to an embodiment of the present application when the inner surface is outward.

[0033] Figure 3 A schematic diagram of insulating film according to an embodiment of the present application.

[0034] Figure 4 A structural schematic diagram of the first identification part of the insulating film according to an embodiment of the present application after being folded with the inner surface outward.

[0035] Figure 5 A structural schematic diagram of the second identification part of the insulating film according to an embodiment of the present application after being folded with the inner surface outward.

[0036] Figure 6 A structural schematic diagram of an insulating film according to an embodiment of the present application when the outer surface is outward.

[0037] Figure 7 A structural schematic diagram of an insulating film according to an embodiment of the present application when the inner surface is outward.

[0038] Reference signs:

[0039] 10, insulating film partition; 11, inner surface; 12, outer surface;

[0040] 20, scribe line; 30, positioning hole; 41, first identification part; 42, second identification part; 50, liquid suction hole. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort should fall into the scope of the present application.

[0042] Unless otherwise defined, 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 herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0043] The terms "comprise", "have" and any variations thereof in the present specification and claims and the accompanying drawings are intended to cover non-exclusive inclusion. The word "one" or "a" does not exclude the presence of more than one.

[0044] 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 "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. A person of ordinary skill in the art will readily recognize from the description, drawings and claims that alternative embodiments of the application can be constructed from the description and figures.

[0045] The term "and / or" in the present application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0046] The orientation words appearing in the following description are the directions shown in the drawings, and do not limit the specific structures of the insulating film, the battery cell and the battery of the present application. For example, in the description of the present application, the orientation or position relationship indicated by the terms "center", "vertical", "horizontal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] In addition, the expressions of the directions for indicating the operation and structure of the insulating film, the battery cell and the battery of the present embodiment, such as the X direction, the Y direction and the Z direction, are not absolute but relative, and although these directions are appropriate when the insulating film, the battery cell and the battery are in the positions shown in the figures, these directions should be interpreted differently when these positions are changed to correspond to the changes.

[0048] In addition, the terms "first", "second", and the like in the description and claims of the present application or the above-mentioned drawings are used to distinguish different objects, and are not used to describe a specific order, which can be explicitly or implicitly included one or more features.

[0049] In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups).

[0050] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, the "connection" or "connection" of the mechanical structure can mean physical connection, for example, the physical connection can be fixed connection, for example, fixed connection by fixing member, for example, fixed connection by screw, bolt or other fixing member; the physical connection can also be detachable connection, for example, mutual clamping or clamping connection; the physical connection can also be integrally connected, for example, welding, bonding or integrally formed connection for connection. The "connection" or "connection" of the circuit structure can mean physical connection, electrical connection or signal connection, for example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, it can also be the connection between two elements; signal connection can be signal connection through circuit, or signal connection through media medium, for example, radio wave. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific situation.

[0051] The insulating film provided by the embodiment of the present application is applied to the battery cell, and the battery cell further comprises a shell and an electrode assembly, the electrode assembly and the insulating film are contained in the battery shell, and the insulating film is used to separate the electrode assembly and the shell.

[0052] The electrode assembly can also be called a bare cell, which is the smallest unit for electrochemical reaction in the battery and is used to realize the charge and discharge of the battery cell. The electrode assembly usually comprises a positive electrode sheet, a negative electrode sheet and a separator separating the positive electrode sheet and the negative electrode sheet. The shell of the battery is injected with electrolyte, and the electrolyte can be soaked into the inside of the electrode assembly to provide ion migration path for the electrochemical reaction of the electrode assembly and play the role of conducting electricity.

[0053] The insulation film is in a thin film structure, which can isolate the electrode assembly and the shell, prevent the electrode assembly from contacting the shell, and avoid short circuit. The insulation film is generally made of a material with good insulation and corrosion resistance, for example, the insulation film can be made of polypropylene (PP) or polyethylene (PE) and the like. In addition, the insulation film can be a translucent or transparent insulation film.

[0054] The insulation film specifically as shown in Figure 1 and Figure 2 , Figure 1 is a structural schematic view of the outer surface of an insulation film provided by the embodiment of the present application when facing outward, Figure 2 is a structural schematic view of the inner surface of an insulation film provided by the embodiment of the present application when facing outward. The opposite surfaces of the insulation film are the inner surface 11 and the outer surface 12. The inner surface 11 of the insulation film is used to cover the electrode assembly of the battery monomer, and the outer surface 12 of the insulation film is used to face away from the electrode assembly and be opposite to the shell.

[0055] As shown in Figure 1 and Figure 2 , the insulation film can include a plurality of insulation film partitions 10. The insulation film partition 10 is a local area of the insulation film, and each insulation film partition 10 corresponds to a different outer surface of the electrode assembly. Among them, Figure 1 and Figure 2 , the plurality of insulation film partitions 10 are separated by score lines 20.

[0056] Each insulation film partition 10 and each outer surface of the electrode assembly can be in a one-to-one correspondence, that is, one insulation film partition 10 can cover one outer surface of the electrode assembly. The insulation film partition 10 and the electrode assembly can also be in a many-to-one correspondence, that is, a plurality of insulation film partitions 10 can simultaneously cover the same outer surface of the electrode assembly.

[0057] The intersection of the plurality of insulation film partitions 10 can be bent to bend the insulation film into a box structure that fits the electrode assembly, so that each insulation film partition 10 covers each outer surface of the electrode assembly. An optional way is shown in Figure 1 , Figure 2 , a score line 20 can be arranged between each adjacent two insulation film partitions 10, so that each adjacent two insulation film partitions 10 can be bent relative to the score line 20.

[0058] The score line 20 can be formed between each two adjacent insulating film partitions 10 by punching or etching. When the insulating film partitions 10 are bent, the score line 20 can provide a guide during the bending process, so that the bending area between the two adjacent insulating film partitions 10 is concentrated near the score line 20, so that the shape of the bent insulating film is more regular, and the bending process is easier to achieve.

[0059] The shape of the score line 20 can be set as a straight line, a dotted line, or the like according to requirements. A feasible way is shown in Figure 1 and Figure 2 The score line 20 is set as a dotted line punched, so that the score line 20 can provide a guide for the bending of the insulating film partition 10, while avoiding excessive cutting of the insulating film when punching the score line 20.

[0060] When punching the score line 20, it can be as shown in Figure 3 , Figure 3 is a schematic diagram of punching a score line on an insulating film according to an embodiment of the present application. The score line 20 can be punched from the outer surface 12 of the insulating film partition 10 to the inner surface 11 of the insulating film partition 10, so that the insulating film partition 10 can be bent more easily from the outer surface 12 to the inner surface 11.

[0061] When installing the insulating film, the correct installation method is that the inner surface 11 of the insulating film faces the electrode assembly, and the outer surface 12 of the insulating film faces outward away from the electrode assembly. For example, when the insulating film is bent into a structure wrapping the electrode assembly by stamping, the insulating film partition 10 can be stamped from the outer surface 12 to the inner surface 11, so that each insulating film partition 10 of the insulating film can be reliably attached to the electrode assembly.

[0062] When installing the insulating film, in order to ensure installation accuracy, an optional way is shown in Figure 1 and Figure 2 A positioning hole 30 can be provided on the insulating film to fix and install the insulating film through the positioning hole 30. For example, the positioning hole 30 can be provided on the insulating film partition 10 corresponding to the bottom surface of the electrode assembly. When installing the insulating film, the insulating film can be aligned and positioned with the insulating member such as a bottom support plate capable of bearing the insulating film and the electrode assembly through the positioning hole 30, and the insulating film can be fixed on the bottom support plate by heat melting or the like, so as to realize the positioning and installation of the insulating film.

[0063] In this way, the positioning hole 30 is provided on the insulating film partition 10, which facilitates the positioning and installation of the insulating film relative to other insulating members, and can ensure the installation accuracy of the insulating film and is not prone to excessive installation errors.

[0064] In this embodiment, in order to avoid the case that it is difficult to distinguish the inner surface 11 of the insulation film partition 10 and the outer surface 12 of the insulation film partition 10, an inner-outer identification part for identifying the inner surface 11 and the outer surface 12 of the insulation film can be arranged on the insulation film.

[0065] The inner-outer identification part is a visible structure with recognition degree that can be viewed, and the operator can specifically identify whether the outward surface of the insulation film is the inner surface 11 or the outer surface 12 through the shape, position, posture and the like of the inner-outer identification part, so as to avoid the case that the insulation film is installed reversely, ensure the correct installation of the insulation film, and be beneficial to improve the efficiency during the installation of the insulation film.

[0066] The structure form of the inner-outer identification part is various, and one optional mode can be as shown in Figure 1 and Figure 2 The inner-outer identification part includes a first identification part 41 and a second identification part 42, the first identification part 41 and the second identification part 42 are arranged at intervals on the insulation film, and the visible contour of the first identification part 41 is different from the visible contour of the second identification part 42.

[0067] The first identification part 41 and the second identification part 42 arranged on the insulation film are structures with obvious visible contour that can be viewed. Moreover, the structure shape of the first identification part 41 and the second identification part 42 is different, so that the visible contour of the first identification part 41 and the second identification part 42 is different, so as to enable the operator to accurately identify the first identification part 41 and the second identification part 42.

[0068] When the insulation film is installed, the operator can compare the first identification part 41 and the second identification part 42 at the same time, judge whether the posture and the position of the first identification part 41 and the second identification part 42 are correct according to the visible contour and the position of the first identification part 41 and the second identification part 42, so as to identify whether the outward surface of the insulation film is the inner surface 11 or the outer surface 12 of the insulation film, know whether the insulation film is installed reversely, ensure the correct installation of the insulation film, reduce the probability of the installation error of the insulation film, and improve the installation efficiency of the insulation film.

[0069] Further, the relative position of the first identification part 41 and the second identification part 42 can also be arranged, and in one optional mode, the relative position of the first identification part 41 and the second identification part 42 can be flipped with the flipping of the insulation film.

[0070] In other words, the relative orientations of the first identification part 41 and the second identification part 42 are opposite from the two viewing angles: looking at the inner surface 11 and looking at the outer surface 12. When the insulating film is installed, the relative orientations of the first identification part 41 and the second identification part 42 when they are away from the electrode assembly on the outer surface 12 of the insulating film will be opposite to the relative orientations when they are facing the electrode assembly on the outer surface 12 of the insulating film.

[0071] For example, when the insulating film is correctly installed, the inner surface 11 of the insulating film faces the electrode assembly, and the outer surface 12 of the insulating film faces away from the electrode assembly. At this time, if the insulating film is not bent, it can be... Figure 1 As shown, the first identification unit 41 is located to the left of the second identification unit 42 from the operator's perspective when viewing the insulating film. When the insulating film is installed backwards, the inner surface 11 of the insulating film faces away from the electrode assembly, and the outer surface 12 of the insulating film faces the electrode assembly. If the insulating film is not bent at this time, it will appear as if... Figure 2 As shown, the first identification unit 41 is located to the right of the second identification unit 42 from the perspective of the operator viewing the insulating film.

[0072] In this method, the relative orientations of the first identification part 41 and the second identification part 42 are reversed when the insulating film is correctly installed and when the insulating film is installed backwards. This allows the relative orientation of the first identification part 41 and the second identification part 42 to also assist in identifying the inner surface 11 and the outer surface 12 of the insulating film, making identification more convenient and further ensuring the correct installation of the insulating film.

[0073] In this embodiment, the first identification part 41 and the second identification part 42 can have many structural forms. For example, the first identification part 41 and the second identification part 42 can be set as a raised structure, a recessed structure, or a special structure at the edge of the insulating film. As long as the user can accurately identify the first identification part 41 and the second identification part 42 through the visible outline of the first identification part 41 and the second identification part 42, it is sufficient.

[0074] For example, one alternative approach is as follows: Figure 1 and Figure 2 As shown, the first identification part 41 is a rounded chamfer on the outer edge of the insulating film, and the second identification part 42 is an angled chamfer on the outer edge of the insulating film.

[0075] In this method, the rounded and beveled chamfers are simple in structure and easy to process. Furthermore, the differences between rounded and beveled chamfers are obvious, making them easy for users to identify. Additionally, by setting the outer edges of the insulating film to rounded and beveled chamfers, the insulating film is less likely to warp or fold when covering the electrode assembly and then being installed into the housing.

[0076] The first identification part 41 and the second identification part 42 can be arranged on the same insulating film partition 10 and located at opposite sides of the insulating film partition 10, or arranged on different insulating film partitions 10.

[0077] An alternative way is shown in Figure 1 and Figure 2 The insulating film includes a plurality of insulating film partitions 10. The first identification part 41 and the second identification part 42 are arranged on two insulating film partitions 10 respectively, and the insulating film partition 10 provided with the first identification part 41 is separated from the insulating film partition 10 provided with the second identification part 42 by another insulating film partition 10.

[0078] Specifically, as shown in Figure 2 , Figure 4 and Figure 5 , Figure 4 is a structural schematic view of the position of the first identification part 41 after the insulating film involved in the embodiments of the present application is folded with the inner surface facing outward, Figure 5 is a structural schematic view of the position of the second identification part 42 after the insulating film involved in the embodiments of the present application is folded with the inner surface facing outward. The insulating film partitions where the first identification part 41 and the second identification part 42 are located can correspond to two opposite sides of the electrode assembly respectively, and after the insulating film is folded, the insulating film partition where the first identification part 41 is located is opposite to the insulating film partition where the second identification part 42 is located.

[0079] In this way, the first identification part 41 and the second identification part 42 are arranged on different insulating film partitions 10 respectively, which is convenient to process, obvious in difference, easy to be viewed and compared, and has strong visibility.

[0080] In addition, a plurality of liquid suction holes 50 can be arranged on the insulating film at intervals, and the liquid suction hole 50 is used for electrolyte or gas to pass through. The specific implementation can be as shown in Figure 6 and Figure 7 A plurality of liquid suction holes 50 are arranged on at least one insulating film partition 10, such as a plurality of liquid suction holes 50 arranged on the insulating film partition 10 corresponding to the bottom surface of the electrode assembly.

[0081] In this way, the liquid suction hole 50 is arranged on the insulating film, which can provide electrolyte to pass through when the insulating film is installed, and is conducive to the smooth installation of the insulating film. Moreover, the insulating film can provide the gas generated inside the battery monomer to pass through, which is conducive to the gas emission when the battery monomer is used.

[0082] The structure of the liquid suction hole 50 has many forms, for example, the liquid suction hole 50 can be arranged as a circular hole, a square hole, etc., which is not limited here. Moreover, the sizes of the plurality of liquid suction holes 50 can be completely the same or different.

[0083] And, the liquid absorbing hole 50 can be arranged to be used for identifying the inner surface 11 and the outer surface 12, so that the liquid absorbing hole 50 constitutes part of the inner-outer identifying part. Exemplarily, one optional way is as shown in Figure 6 and Figure 7 The inner-outer identifying part includes a plurality of liquid absorbing holes 50, and the plurality of liquid absorbing holes 50 are asymmetrically arranged on the insulating film, and the liquid absorbing hole 50 is used for electrolyte or gas to pass through.

[0084] The asymmetric arrangement means that the size or shape of each liquid absorbing hole 50 changes in the arrangement direction, so that the arrangement of the plurality of liquid absorbing holes 50 is different when the insulating film is correctly installed and when the insulating film is installed reversely. When the insulating film is installed, the operator sees the arrangement of the plurality of liquid absorbing holes 50 from two visual angles of looking at the inner surface 11 and looking at the outer surface 12, so as to identify the inner surface 11 and the outer surface 12.

[0085] The plurality of liquid absorbing holes 50 can be arranged in many ways, exemplarily, the size of the plurality of liquid absorbing holes 50 can be gradually increased in the arrangement direction, or the size of the plurality of liquid absorbing holes 50 can be gradually decreased in the arrangement direction, or the shape of the liquid absorbing holes 50 arranged at both ends can be different, such as the liquid absorbing hole 50 at one end is circular and the liquid absorbing hole 50 at the other end is square.

[0086] In this way, the plurality of liquid absorbing holes 50 are asymmetrically arranged in the arrangement direction, and the plurality of liquid absorbing holes 50 can present an incorrect arrangement when the insulating film is installed reversely, so as to assist in identifying the inner surface 11 and the outer surface 12 of the insulating film, and the identification is more convenient, and the correct installation of the insulating film is further ensured.

[0087] In addition, the asymmetrically arranged plurality of liquid absorbing holes 50 can be used simultaneously with the first identifying part 41 and the second identifying part 42 to further enhance the identification effect. Exemplarily, in one feasible way, the plurality of liquid absorbing holes 50 are asymmetrically arranged along the direction of the first identifying part 41 to the second identifying part 42, so that the operator can identify the inner surface and the outer surface of the insulating film through the first identifying part 41, the second identifying part 42 and the liquid absorbing hole 50 at the same time, and the identification is more convenient.

[0088] The first embodiment above describes an insulating film in detail, and the second embodiment below describes a battery cell including the insulating film of the first embodiment, which is as follows.

[0089] The battery cell includes an electrode assembly, a case, and the insulating film described above. The insulating film is located between the electrode assembly and the case, and the inner surface of the insulating film covers the electrode assembly to separate the electrode assembly and the case.

[0090] The specific structure of the insulation film corresponds to the insulation film of the foregoing embodiments, and the specific structure of the insulation film is arranged in the manner described with reference to the description of the insulation film in any one of the embodiments related to the insulation film, and the similar parts will not be described in detail in this embodiment.

[0091] The insulation film of the battery monomer is provided with an inside-out identification part, which can assist in identifying whether the insulation film is installed reversely, thereby ensuring correct installation of the insulation film and improving the accuracy and efficiency of the assembly of the battery monomer.

[0092] In addition, the third embodiment of the present application also provides a battery, which comprises a plurality of battery monomers as described in the second embodiment.

[0093] The battery can be a battery pack or a battery module. When the battery is a battery pack, the battery pack specifically comprises a battery management system (BMS) and a plurality of battery monomers. The plurality of battery monomers can be electrically connected in series, in parallel, or in a mixed manner of series and parallel, and are communicatively connected with the battery management system to form the battery pack, and the battery management system controls and monitors the working state of each battery monomer. In addition, the plurality of battery monomers can be first connected in series and / or in parallel to form a battery module, and then a plurality of battery modules are electrically connected in series, in parallel, or in a mixed manner of series and parallel, and are communicatively connected with the battery management system to form the battery pack.

[0094] The plurality of battery monomers in the battery pack or the battery module can be mounted on a support structure such as a box, a frame, a bracket, etc., and the battery monomers can be electrically connected through bus components such as busbars. The battery monomers can be lithium ion batteries, sodium ion batteries, or magnesium ion batteries, and the external profile thereof can be a cylinder, a flat body, a cuboid, or other shapes, but are not limited thereto.

[0095] The specific structure of the battery monomer corresponds to the battery monomer of the foregoing embodiments, and the specific structure of the battery monomer is arranged in the manner described with reference to the description of the insulation film in any one of the embodiments related to the insulation film, and the similar parts will not be described in detail in this embodiment.

[0096] The battery comprises battery monomers, and the insulation film is provided on each of the battery monomers. The insulation film is provided with an inside-out identification part, which can assist in identifying whether the insulation film is installed reversely, thereby ensuring correct installation of the insulation film, improving the accuracy and efficiency of the assembly of the battery monomer, and reducing the overall assembly cycle of the battery.

[0097] In summary, the insulating film, the battery cell and the battery described above, the insulating film is provided with an inside-out identification part. When installing the insulating film, the operator can accurately identify the inner and outer surfaces of the insulating film through the inside-out identification part, thereby avoiding the situation of installing the insulating film in reverse, ensuring the correct installation of the insulating film, and being conducive to improving the efficiency of the installation of the insulating film.

[0098] Those skilled in the art will appreciate that a combination of features of different embodiments is within the scope of the application and forms different embodiments, even though some embodiments herein do not include certain features included in other embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0099] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An insulating film applied to a battery cell, characterized by, The insulation film has an inner surface and an outer surface, and the inner surface of the insulation film covers the electrode assembly of the battery cell; The insulation film is provided with an inner-outer identification part for identifying the inner surface and the outer surface.

2. The insulating film according to claim 1, characterized by The inner-outer identification part includes a first identification part and a second identification part, and the first identification part and the second identification part are arranged at intervals on the insulation film, and the visible profile of the first identification part is different from that of the second identification part.

3. The insulating film according to claim 2, characterized by The relative positions of the first identification part and the second identification part can be flipped with the flipping of the insulation film.

4. The insulating film according to claim 2, characterized by The insulation film includes a plurality of insulation film sub-zones. The first identification part and the second identification part are arranged on two insulation film sub-zones respectively, and the insulation film sub-zone provided with the first identification part is separated from the insulation film sub-zone provided with the second identification part by another insulation film sub-zone.

5. The insulating film according to claim 2, characterized by The first identification part is a round corner chamfer arranged at the outer edge of the insulation film, and the second identification part is an inclined angle chamfer arranged at the outer edge of the insulation film.

6. The insulating film according to any one of claims 1 to 5, wherein The inner-outer identification part includes a plurality of liquid suction holes, and the plurality of liquid suction holes are arranged asymmetrically on the insulation film, and the liquid suction holes are used for electrolyte or gas to pass through.

7. The insulating film according to claim 1, wherein The insulation film includes a plurality of insulation film sub-zones; and a score line is arranged between each two adjacent insulation film sub-zones to enable each two adjacent insulation film sub-zones to be bent relative to each other along the score line.

8. The insulating film according to claim 7, characterized by The score line is a virtual line formed by punching.

9. A battery cell characterized by, The battery cell includes an electrode assembly, a shell, and the insulation film according to any one of claims 1-8. The insulation film is located between the electrode assembly and the shell, and the inner surface of the insulation film covers the electrode assembly to separate the electrode assembly and the shell.

10. A battery, characterized by The battery includes a plurality of battery cells according to claim 9.

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