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 the insulating film includes a plurality of insulating film partitions. Two opposite surfaces of the insulating film partition are an inner surface and an outer surface, and the inner surface of the insulating film partition is used for covering an electrode assembly of the battery monomer. At least one insulating film subarea is provided with a fool-proof mark, the positive sequence outline of the fool-proof mark is located on the outer surface of the insulating film subarea, and the positive sequence outline of the fool-proof mark is different from the negative sequence outline of the fool-proof mark. According to the insulating film, the battery monomer and the battery, the insulating film subareas of the insulating film are provided with the fool-proof marks, and the fool-proof marks can assist in identifying the inner surfaces and the outer surfaces of the insulating film subareas, so that the condition that the insulating film is reversely mounted is avoided, and 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, and the safety and reliability requirements of battery cells are also increasingly improved.

[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, battery failure or safety accidents.

[0004] However, the existing insulation film has a single structure, and problems such as misassembly and reverse assembly are prone to occur during assembly, which affects the production efficiency of the battery and may also pose a potential threat to the performance and safety of the battery. Therefore, how to correctly install the insulation film has become a technical problem to be solved. CONTENT OF THE UTILITY MODEL

[0005] In view of the above problems, the embodiments of the present application provide an insulation film, which is provided with a foolproof mark on the insulation film partition, and the normal sequence profile of the foolproof mark is displayed on the outer surface of the insulation film partition. When the insulation film is installed, the foolproof mark can assist in identifying the inner surface and the outer surface of the insulation film partition, thereby avoiding the reverse assembly of the insulation film and facilitating the correct installation of the insulation film. The embodiments of the present application also provide a battery cell and a battery provided with the insulation film.

[0006] In one aspect of the embodiments of the present application, an insulation film applied to a battery cell is provided, which includes a plurality of insulation film partitions. The opposite surfaces of the insulation film partition are an inner surface and an outer surface, and the inner surface of the insulation film partition is used to cover the electrode assembly of the battery cell. At least one insulation film partition is provided with a foolproof mark, and the normal sequence profile of the foolproof mark is located on the outer surface of the insulation film partition. The normal sequence profile of the foolproof mark is different from the reverse sequence profile of the foolproof mark.

[0007] The foolproof mark on the insulation film can assist in identifying the inner surface and the outer surface of the insulation film partition, thereby avoiding the reverse assembly of the insulation film and ensuring the correct installation of the insulation film, which is conducive to improving the efficiency of the insulation film installation. After the insulation film is installed, whether the normal sequence profile of the foolproof mark is displayed on the outside can also be used to detect whether the insulation film is installed reversely, thereby further ensuring the correct installation of the insulation film.

[0008] In an optional manner, the foolproof mark is provided on the insulation film partition with the largest surface area among the plurality of insulation film partitions.

[0009] The method is convenient for processing the fool-proof mark and makes the fool-proof mark more convenient to view.

[0010] In an alternative method, the fool-proof mark is stamped from the inner surface of the insulation film partition to the outer surface of the insulation film partition. The forward sequence profile of the fool-proof mark is a forward sequence convex profile on the outer surface of the insulation film partition, and the reverse sequence profile of the fool-proof mark is a reverse sequence concave profile on the inner surface of the insulation film partition.

[0011] The method processes the fool-proof mark by stamping, which is low in cost and convenient to process, and the visibility of the formed fool-proof mark is strong and easy to view.

[0012] In an alternative method, the insulation film is a transparent insulation film. The fool-proof mark is printed by laser, and the transparency of the fool-proof mark is lower than that of the area on the transparent insulation film which is not provided with the fool-proof mark.

[0013] The method processes the fool-proof mark by laser printing, which is higher in automation and higher in processing precision of the fool-proof mark, and the visibility of the fool-proof mark is strong and easy to view.

[0014] In an alternative method, the fool-proof mark includes fool-proof text and / or fool-proof patterns.

[0015] The method can make the fool-proof mark more recognizable and more attractive to the attention of the operator.

[0016] In an alternative method, a score line is arranged between each adjacent two insulation film partitions to enable each adjacent two insulation film partitions to be relatively bent along the score line.

[0017] In the method, the score line provides a guiding action when the insulation film partition is bent, so that the bending area between the adjacent two insulation film partitions is concentrated near the score line, so that the shape of the insulation film after bending is more regular, and the bending process is easier to achieve.

[0018] In an alternative method, the score line is a virtual line stamped.

[0019] The method can make the score line provide a guiding action for the bending of the insulation film partition while avoiding excessive cutting of the insulation film when the score line is stamped.

[0020] In an alternative method, at least one insulation film partition is provided with a positioning hole to fix and install the insulation film through the positioning hole.

[0021] In the method, the insulation film partition is provided with a positioning hole, which is convenient for positioning and installing the insulation film relative to other insulation parts, can ensure the installation precision of the insulation film, and is not prone to large installation errors.

[0022] In another aspect of the embodiments of the present application, a battery cell includes an electrode assembly, a case, and the above-mentioned insulation film. The insulation film is located between the electrode assembly and the case, and the inner surface of each insulation film partition of the insulation film covers the electrode assembly to separate the electrode assembly from the case.

[0023] The insulation film of the battery cell is provided with a fool-proof mark. The normal sequence profile of the fool-proof mark is located on the outer surface of the insulation film partition, and the normal sequence profile of the fool-proof mark is different from the reverse sequence profile of the fool-proof mark. When the insulation film is installed, the inner surface and the outer surface of the insulation film can be easily identified through the fool-proof mark, and the situation of the insulation film being installed in reverse can be avoided, so as to ensure the correct installation of the insulation film and improve the accuracy and efficiency of the assembly of the battery cell.

[0024] In another aspect of the embodiments of the present application, a battery is provided, which includes a plurality of the above-mentioned battery cells.

[0025] The battery includes the battery cells, and the insulation film is provided in each of the battery cells. The insulation film is provided with a fool-proof mark. The normal sequence profile of the fool-proof mark is located on the outer surface of the insulation film partition, and the normal sequence profile of the fool-proof mark is different from the reverse sequence profile of the fool-proof mark. When the battery cell is assembled, the inner surface and the outer surface of the insulation film can be easily identified through the fool-proof mark, and the situation of the insulation film being installed in reverse can be avoided, so as to ensure the correct installation of the insulation film, improve the accuracy and efficiency of the assembly of the battery cell, and further reduce the overall assembly period of the battery.

[0026] In the insulation film, the battery cell and the battery provided by the embodiments of the present application, the insulation film partition of the insulation film is provided with a fool-proof mark. The normal sequence profile of the fool-proof mark is located on the outer surface of the insulation film partition, and the normal sequence profile of the fool-proof mark is different from the reverse sequence profile of the fool-proof mark. When the insulation film is correctly installed, the inner surface of the insulation film partition faces the electrode assembly, the outer surface of the insulation film partition is away from the electrode assembly, and the normal sequence profile of the fool-proof mark is displayed outward. When the insulation film is installed, the fool-proof mark can assist in identifying the inner surface and the outer surface of the insulation film partition, so that the operator can identify the inner surface and the outer surface of the insulation film partition through the normal sequence profile of the fool-proof mark, avoid the situation of the insulation film being installed in reverse, ensure the correct installation of the insulation film, and be beneficial to improving the efficiency of the installation of the insulation film. After the insulation film is installed, whether the normal sequence profile of the fool-proof mark is displayed outward can also be used to detect whether the insulation film is installed in reverse, so as to further ensure the correct installation of the insulation film.

[0027] The above description is only a summary of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the embodiments of the present application, 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 obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings described in the following embodiments are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0029] Figure 1 A structural schematic diagram of an insulating film according to an embodiment of the present application is shown from a perspective of an outer surface of a partition of the insulating film.

[0030] Figure 2 A structural schematic diagram of an insulating film according to an embodiment of the present application is shown from a perspective of an inner surface of a partition of the insulating film.

[0031] Figure 3 A schematic diagram of insulating film line etching according to an embodiment of the present application is shown.

[0032] Figure 4 A structural schematic diagram of an insulating film according to an embodiment of the present application is shown after the insulating film is bent with the outer surface of the partition of the insulating film facing outward.

[0033] Figure 5 A structural schematic diagram of an insulating film according to an embodiment of the present application is shown after the insulating film is bent with the inner surface of the partition of the insulating film facing outward.

[0034] Reference signs:

[0035] 10, partition of insulating film; 11, inner surface; 12, outer surface;

[0036] 20, line; 30, positioning hole; 40, fool-proof mark. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0038] 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 of the specification of the application is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0039] The terms "comprise" and "have" and any variations thereof in the specification and in the claims and the accompanying drawings mean "including, but not limited to" and the terms "a" or "an" do not exclude the presence of more than one.

[0040] 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. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0041] The term "and / or", merely describes association between associated objects, and means that there can be three relationships, for example, A and / or B, can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0042] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the insulating film, the battery cell and the battery of the application. For example, in the description of the 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 indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the 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 application.

[0043] In addition, the expressions of the indicating directions used to describe the operation and structure of each component of the insulating film, the battery cell and the battery of the embodiment, such as X direction, Y direction and Z direction, are not absolute but relative, and although these indications are appropriate when each component of the insulating film, the battery cell and the battery is in the position shown in the drawings, these directions should be interpreted differently to correspond to the changes when these positions change.

[0044] In addition, the terms "first", "second", and the like in the specification and claims of the application or the above drawings are used to distinguish different objects, and are not used to describe a particular order, and can explicitly or implicitly include one or more of the features.

[0045] In the description of the present application, the meaning of "a plurality of" is two or more (including two), and the meaning of "a plurality of groups" is two or more groups (including two groups).

[0046] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense. For example, the "connection" or "connection" of the mechanical structure can mean a physical connection, such as a fixed connection, for example, a fixed connection by a fixing member, such as a screw, bolt or other fixing member; the physical connection can also be a detachable connection, such as a mutual clamping or clamping connection; the physical connection can also be integrally connected, such as welding, bonding or integrally formed connection. The "connection" or "connection" of the circuit structure can mean electrical connection or signal connection, such as direct connection, that is, physical connection, or indirect connection through at least one intermediate element, as long as the circuit is connected, and can also be the internal connection of two elements; signal connection can also mean signal connection through media medium, such as radio waves. 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.

[0047] The insulating film provided by the embodiment of the present application is applied to the battery monomer, and the battery monomer 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.

[0048] 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 charging and discharging of the battery monomer. 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, which 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 a conductive role.

[0049] The insulating film is a thin film structure, which can separate the electrode assembly and the shell to prevent the electrode assembly and the shell from contacting and avoid short circuit. The insulating film is generally made of a material with good insulation and corrosion resistance, for example, the insulating film can usually be made of polypropylene (PP, Polypropylene) or polyethylene (PE, Polyethylene) and the like. Moreover, the insulating film can be a semi-transparent insulating film or a transparent insulating film.

[0050] The insulating film comprises a plurality of insulating film partitions 10, which can be specifically as shown in Figure 1 and Figure 2 Figure 1 ​This is a schematic diagram of the structure of an insulating film as shown in the embodiment of this application, viewed from the outer surface of the insulating film partition. Figure 2 This is a schematic diagram of the structure of an insulating film according to an embodiment of this application, viewed from the inner surface of a partition in the insulating film. Wherein, Figure 1 and Figure 2 The multiple insulating film sections 10 are separated by scribe lines 20.

[0051] The insulating film partition 10 is a local area of ​​the insulating film, and each insulating film partition 10 corresponds to a different outer surface on the electrode assembly. The correspondence between each insulating film partition 10 and each outer surface of the electrode assembly can be one-to-one, meaning that one outer surface of the electrode assembly can be covered by one insulating film partition 10. Alternatively, the correspondence between the insulating film partition 10 and the electrode assembly can be many-to-one, meaning that multiple insulating film partitions 10 can simultaneously cover the same outer surface of the electrode assembly.

[0052] The intersections of multiple insulating film sections 10 can be bent to fold the insulating film into a box structure that fits the electrode assembly, so that each insulating film section 10 precisely covers each outer surface of the electrode assembly. An alternative approach is as follows: Figure 1 , Figure 2 As shown, a scribe line 20 can be provided between each two adjacent insulating film partitions 10 so that each two adjacent insulating film partitions 10 can be bent relative to each other along the scribe line 20.

[0053] The engraving lines 20 can be formed between each pair of adjacent insulating film sections 10 by means of punching or etching. When the insulating film section 10 is bent, the engraving lines 20 provide guidance during the bending process, so that the bending area between two adjacent insulating film sections 10 is concentrated near the engraving lines 20, making the shape of the insulating film after bending more regular and the bending process easier to achieve.

[0054] The shape of the engraving 20 can be set to a straight line, dashed line, or other structural form as needed. One feasible method is as follows: Figure 1 and Figure 2 As shown, the scribe line 20 is set as a dotted line formed by punching, so that the scribe line 20 can guide the bending of the insulating film partition 10 while avoiding excessive cutting during punching of the scribe line 20, which would damage the insulating film.

[0055] In this embodiment, the two opposite sides of the insulating film partition 10 are the inner surface 11 and the outer surface 12. The inner surface 11 of the insulating film partition 10 is used to cover the electrode assembly of the battery cell, and the outer surface 12 of the insulating film partition 10 is used to be away from the electrode assembly and opposite to the outer casing.

[0056] When stamping engraving lines 20, it can be like Figure 3 As shown, Figure 3This is a schematic diagram of punching etched lines on an insulating film according to an embodiment of this application. The etched lines 20 can be punched along the direction from the outer surface 12 of the insulating film partition 10 to the inner surface 11 of the insulating film partition, making it easier for the insulating film partition 10 to bend from the outer surface 12 to the inner surface 11.

[0057] When installing the insulating film, the correct installation method will cause the inner surface 11 to face the electrode assembly and the outer surface 12 to face away from the electrode assembly. For example, when the insulating film is bent into a structure that wraps around the electrode assembly by stamping, it can be stamped from the outer surface 12 of the insulating film partition 10 to the inner surface 11 of the insulating film partition 10 so that each insulating film partition 10 can be reliably attached to the electrode assembly.

[0058] To ensure installation accuracy when installing the insulating film, one optional method is as follows: Figure 1 and Figure 2 As shown, a positioning hole 30 can be provided on at least one insulating film partition 10 to fix the insulating film in place. Specifically, for example, a 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 components such as the base plate that can support the insulating film and the electrode assembly through the positioning hole 30, and the insulating film can be fixed to the base plate by means of heat fusion or the like, so as to achieve the positioning and installation of the insulating film.

[0059] In this method, the insulating film partition 10 is provided with positioning holes 30, which facilitates the positioning and installation of the insulating film relative to other insulating components, ensuring the installation accuracy of the insulating film and preventing excessive installation errors.

[0060] In this embodiment, to avoid the difficulty in distinguishing between the inner surface 11 and the outer surface 12 of the insulating film partition 10, a foolproof mark 40 can be provided on at least one insulating film partition 10. Specific implementation methods are as follows: Figure 1 and Figure 2 As shown, at least one insulating film partition 10 is provided with a foolproof mark 40, the positive sequence outline of the foolproof mark 40 is located on the outer surface 12 of the insulating film partition 10, and the positive sequence outline of the foolproof mark 40 is different from the negative sequence outline of the foolproof mark 40.

[0061] The foolproof marking 40 provided on the insulating film partition 10 has a specific outline that is easy to identify. Furthermore, the forward outline of the foolproof marking 40 is different from the reverse outline of the foolproof marking 40, so as to avoid affecting the identification of the inner surface 11 and the outer surface 12 when the forward and reverse outlines of the foolproof marking 40 are the same.

[0062] The normal sequence profile of the fool-proof mark 40 and the reverse sequence profile of the fool-proof mark 40 are mirror images of each other. The normal sequence profile of the fool-proof mark 40 conforms to the reading habit of the operator. The normal sequence profile of the fool-proof mark 40 is located on the outer surface 12 of the insulation film partition 10, and the normal sequence profile of the fool-proof mark 40 is displayed outward when the insulation film is correctly installed, as shown in Figure 4 , Figure 4 Fig. 2 is a structural schematic view of the insulation film after being bent, with the outer surface of the insulation film partition facing outward, according to an embodiment of the present application. At this time, the normal sequence profile of the fool-proof mark 40 faces outward away from the electrode assembly, and the operator can easily recognize the fool-proof mark 40 visually, and thus knows that the installation mode of the insulation film at this time is correct.

[0063] The reverse sequence profile of the fool-proof mark 40 does not conform to the reading habit of the operator. The normal sequence profile of the fool-proof mark 40 faces the electrode assembly when the insulation film is installed reversely, and can be specifically as shown in Figure 5 , Figure 5 Fig. 3 is a structural schematic view of the insulation film after being bent, with the inner surface of the insulation film partition facing outward, according to an embodiment of the present application. At this time, the operator cannot see the normal sequence profile of the fool-proof mark 40, and can only see the reverse sequence profile of the fool-proof mark 40, and thus knows that the installation mode of the insulation film at this time is incorrect.

[0064] As shown in Figure 1 and Figure 2 , the fool-proof mark 40 can include fool-proof text and / or fool-proof patterns, so that the fool-proof mark 40 is more recognizable and can attract more attention of the operator. For example, the fool-proof mark 40 can be a text mark of "1234" arranged in accordance with the usual reading order, as shown in Figure 1 and Figure 2 .

[0065] In the embodiment, since the normal sequence profile of the fool-proof mark 40 is different from the reverse sequence profile of the fool-proof mark 40, the recognition effect can be enhanced, and even when the insulation film is of transparent or semi-transparent material, the operator or the camera on the automatic production line can recognize the inner surface 11 and the outer surface 12 of the insulation region by recognizing the profile of the fool-proof mark 40, so as to judge whether the installation mode of the insulation film is correct, to ensure the correct installation of the insulation film and improve the installation efficiency of the insulation film. In addition, after the insulation film is installed on the electrode assembly, whether the insulation film is installed reversely can also be checked by checking whether the normal sequence profile of the fool-proof mark 40 is displayed outward, so as to further ensure the correctness of the installation of the insulation film.

[0066] In the embodiment, the fool-proof mark 40 can be arranged on any insulation film partition 10. For example, an optional mode is as shown in Figure 1As shown, the fool-proof mark 40 can be arranged on the insulating film partition with the largest surface area, so as to facilitate the processing of the fool-proof mark 40 and make the fool-proof mark 40 more easily viewed.

[0067] The fool-proof mark 40 can be processed by printing, laser printing, etc., so as to form a structure with convexity and concavity or a frosted mark structure.

[0068] For example, in an alternative way, the fool-proof mark 40 is printed from the inner surface 11 of the insulating film partition 10 to the outer surface 12 of the insulating film partition 10. The forward sequence profile of the fool-proof mark 40 is a forward sequence convex profile on the outer surface 12 of the insulating film partition 10, and the reverse sequence profile of the fool-proof mark 40 is a reverse sequence concave profile on the inner surface 11 of the insulating film partition 10.

[0069] In this way, the printing process of the fool-proof mark 40 has a stamping action, which can be completed by a stamping die with the shape of the fool-proof mark 40. After the fool-proof mark 40 is printed from the inner surface 11 of the insulating film partition 10 to the outer surface 12 of the insulating film partition 10, the outer surface 12 of the insulating film partition 10 forms a convex forward sequence profile, i.e., a forward sequence convex profile, and the outer surface 12 of the insulating film partition 10 forms a concave reverse sequence profile, i.e., a reverse sequence concave profile.

[0070] This way processes the fool-proof mark 40 by printing, which is low in cost and convenient to process, and the visibility of the fool-proof mark 40 is strong and easy to view.

[0071] In another alternative way, the insulating film is a transparent insulating film. The fool-proof mark 40 is printed by laser, and the transparency of the fool-proof mark 40 is lower than that of the area on the transparent insulating film without the fool-proof mark 40. In specific implementation, the fool-proof mark 40 can be printed by laser to have a frosted structure, so that the transparency of the fool-proof mark 40 is lower than that of the area on the transparent insulating film without the fool-proof mark 40.

[0072] This way processes the fool-proof mark 40 by laser printing, which is higher in automation and higher in processing precision of the fool-proof mark 40, and the visibility of the fool-proof mark 40 is strong and easy to view.

[0073] The first embodiment above describes an insulating film, and the second embodiment below describes a battery cell including the insulating film of the first embodiment, as follows.

[0074] The battery cell includes an electrode assembly, a case, and the above-mentioned insulating film. The insulating film is located between the electrode assembly and the case, and the inner surfaces of the insulating film partitions of the insulating film cover the electrode assembly to separate the electrode assembly and the case.

[0075] The specific structure of the insulating film corresponds to the insulating film of the aforementioned embodiments, and the specific structure of the insulating film is described with reference to the description of the insulating film in any one of the embodiments related to the insulating film. Similarities are not described in detail in this embodiment.

[0076] The insulating film of the battery cell is provided with a foolproof mark. The normal sequence profile of the foolproof mark is located on the outer surface of the insulating film partition, and the normal sequence profile of the foolproof mark is different from the reverse sequence profile of the foolproof mark. When the insulating film is installed, the inner surface and the outer surface of the insulating film can be easily identified by the foolproof mark, and the situation of the insulating film being installed in reverse can be avoided, ensuring correct installation of the insulating film and improving the accuracy and efficiency of the battery cell assembly.

[0077] In addition, the third embodiment of the present application also provides a battery, which includes a plurality of battery cells as described in the above-mentioned second embodiment.

[0078] The battery can be a battery pack or a battery module. When the above-mentioned battery is a battery pack, the battery pack specifically includes a battery management system (BMS, Battery Management System) and a plurality of the above-mentioned battery cells. The plurality of battery cells 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 a battery pack. The above-mentioned battery management system controls and monitors the working state of each battery cell. In addition, the plurality of battery cells can be first connected in series and / or in parallel, and form a battery module with the module management system. Then, a plurality of battery modules are electrically connected in series, in parallel, or in a mixed manner of series and parallel, and are collectively connected with the battery management system to form a battery pack.

[0079] Among them, the plurality of battery cells in the above-mentioned battery pack or battery module can be installed on a support structure such as a box, a frame, a bracket, etc. The battery cells can be electrically connected through bus components such as busbars. The above-mentioned battery cell can be a lithium ion battery, a sodium ion battery, or a magnesium ion battery, and its external profile can be a cylinder, a flat body, a cuboid, or other shapes, but it is not limited to this.

[0080] The specific structure of the battery cell corresponds to the battery cell of the aforementioned embodiments, and the specific structure of the battery cell is described with reference to the description of the insulating film in any one of the embodiments related to the battery cell. Similarities are not described in detail in this embodiment.

[0081] The battery has battery monomers, and the battery monomers are provided with insulating films, the insulating films are provided with fool-proof marks, the normal sequence profile of the fool-proof mark is located on the outer surface of the insulating film partition, and the normal sequence profile of the fool-proof mark is different from the reverse sequence profile of the fool-proof mark. When assembling the battery monomers, the inner surface and the outer surface of the insulating film can be easily identified through the fool-proof mark, the situation of the insulating film being installed reversely is avoided, the correct installation of the insulating film is ensured, the accuracy and the efficiency of the assembly of the battery monomers are improved, and the overall assembly cycle of the battery is reduced.

[0082] In summary, in the above-described insulating film, the battery monomer and the battery, the insulating film partition of the insulating film is provided with the fool-proof mark, the normal sequence profile of the fool-proof mark is located on the outer surface of the insulating film partition, and the normal sequence profile of the fool-proof mark is different from the reverse sequence profile of the fool-proof mark. When the insulating film is correctly installed, the inner surface of the insulating film partition faces the electrode assembly, the outer surface of the insulating film partition is away from the electrode assembly, and the normal sequence profile of the fool-proof mark is displayed outward. When the insulating film is installed, the fool-proof mark can assist in identifying the inner surface and the outer surface of the insulating film partition, so that the operator can identify the inner surface and the outer surface of the insulating film partition through the normal sequence profile of the fool-proof mark, the situation of the insulating film being installed reversely is avoided, the correct installation of the insulating film is ensured, and the efficiency of the installation of the insulating film is improved. After the insulating film is installed, whether the normal sequence profile of the fool-proof mark is displayed outward can also be used to detect whether the insulating film is installed reversely, so as to further ensure the correct installation of the insulating film.

[0083] Those skilled in the art can understand that, although some embodiments herein do not include certain features included in other embodiments, the combination of features of different embodiments is still within the scope of the present application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0084] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to 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 insulating film comprises a plurality of insulating film partitions; The opposite surfaces of the insulating film partitions are inner surfaces and outer surfaces, and the inner surfaces of the insulating film partitions are used to cover the electrode assembly of the battery cell; At least one of the insulating film partitions is provided with a fool-proof mark, and the normal sequence profile of the fool-proof mark is located on the outer surface of the insulating film partition; the normal sequence profile of the fool-proof mark is different from the reverse sequence profile of the fool-proof mark.

2. The insulating film according to claim 1, characterized by The fool-proof mark is arranged on the insulating film partition with the largest surface area among the plurality of insulating film partitions.

3. The insulating film according to claim 1, characterized by The fool-proof mark is embossed from the inner surface of the insulating film partition to the outer surface of the insulating film partition; The normal sequence profile of the fool-proof mark is a normal sequence convex profile located on the outer surface of the insulating film partition; and the reverse sequence profile of the fool-proof mark is a reverse sequence concave profile located on the inner surface of the insulating film partition.

4. The insulating film according to claim 1, characterized by The insulating film is a transparent insulating film; The fool-proof mark is printed by laser, and the transparency of the fool-proof mark is lower than that of the area of the transparent insulating film without the fool-proof mark.

5. The insulating film according to claim 1, characterized by The fool-proof mark comprises fool-proof words and / or fool-proof patterns.

6. The insulating film according to claim 1, characterized by A score line is arranged between each two adjacent insulating film partitions, so that each two adjacent insulating film partitions can be relatively bent along the score line.

7. The insulating film according to claim 6, characterized by The score line is a virtual line formed by embossing.

8. The insulating film according to claim 1, characterized by At least one of the insulating film partitions is provided with a positioning hole, so that the insulating film can be fixedly installed through the positioning hole.

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

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

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