Insulating film, battery, battery module, battery pack and electric equipment

Abstract

The embodiment of the utility model provides an insulating film, a battery, a battery module, a battery pack and electric equipment. The first end and the second end are two opposite ends of the insulating film; the first indentation is arranged between the first end and the second end and is close to the first end; the second indentation is arranged between the first end and the second end and is close to the second end; the insulation film is used for wrapping at least part of the pole core to be wrapped, the first indentation corresponds to the first edge of the pole core to be wrapped, the second indentation corresponds to the second edge of the pole core to be wrapped, the distance between the first indentation and the second indentation is W12, the distance between the first edge and the second edge of the pole core to be wrapped is T, and T is larger than or equal to 2. And 0 < = W12-T < = 0.5 mm; by limiting the sizes of the insulating film and the pole core to be coated, the insulating film is effectively ensured not to extrude the pole core to be coated when coating the pole core to be coated, and the production quality of the battery is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to an insulating film, a battery, a battery module, a battery pack and electrical equipment. Background Art

[0002] In the prior art, in order to ensure the insulation performance of the battery core and the shell, an insulating film is usually used to cover the core to achieve the purpose of insulation between the core and the shell. However, the current insulating film is easy to squeeze the core when covering the core, resulting in poor battery quality.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Utility Model Content

[0004] One object of the utility model is to provide a new technical solution for an insulating film, a battery, a battery module, a battery pack and an electrical device.

[0005] According to a first aspect of the present utility model, an insulating film is provided, wherein the insulating film comprises:

[0006] a first end and a second end, wherein the first end and the second end are two opposite ends of the insulating film;

[0007] An indentation, the indentation comprising a first indentation and a second indentation, the first indentation being disposed between the first end and the second end and close to the first end; the second indentation being disposed between the first end and the second end and close to the second end;

[0008] The insulating film is used to cover at least part of the pole core to be covered, and the first indentation corresponds to the first edge of the pole core to be covered, the second indentation corresponds to the second edge of the pole core to be covered, and the distance between the first indentation and the second indentation is W 12 , the distance between the first edge and the second edge of the core to be coated is T, and 0≤W 12 -T≤0.5mm.

[0009] Optionally, the indentation further includes a third indentation, the third indentation is arranged between the first indentation and the second indentation and close to the first indentation, and the distance between the first indentation and the third indentation is W. 3 ;

[0010] The third indentation corresponds to the third edge of the core to be coated, the distance between the first edge and the third edge of the core to be coated is W, and 0≤W 3 -W≤0.5mm.

[0011] Optionally, the indentation further includes a fourth indentation, the fourth indentation is arranged between the first indentation and the second indentation and close to the second indentation, and the distance between the second indentation and the fourth indentation is W. 4 ;

[0012] The fourth indentation corresponds to the fourth edge of the electrode core to be coated, the distance between the second edge and the fourth edge of the electrode core to be coated is W, and 0≤W 4 -W≤0.5mm.

[0013] Optionally, the distance between the third indentation and the fourth indentation is W 5 , the distance between the third edge and the fourth edge of the core to be coated is T, and 0≤W 5 -T≤0.5mm.

[0014] Optionally, an overlapping depth of the insulating film portion between the first indentation and the first end and an overlapping depth of the insulating film portion between the second indentation and the second end is greater than or equal to 2 mm.

[0015] Optionally, the thickness of the insulating film is T 1 , and 0.05mm≤T 1 ≤0.2mm.

[0016] Optionally, the depth of the indentation is D, and 0.2T 1 ≤D≤0.8T 1 .

[0017] Optionally, the insulating film is a PP film or a PET film.

[0018] Optionally, the insulating film includes a first film layer, a second film layer and a third film layer, and the second film layer is arranged between the first film layer and the third film layer;

[0019] Wherein, the first film layer is a PP film, the second film layer is a PET film, and the third film layer is a PP film.

[0020] According to a second aspect of the utility model, a battery is provided, comprising a pole core to be coated, a shell and an insulating film as described in any one of the first aspects, wherein the insulating film coats at least a portion of the pole core to be coated, and the shell covers at least a portion of the insulating film.

[0021] Optionally, it further comprises a first cover plate and a second cover plate, wherein the first cover plate and the second cover plate are respectively arranged at two ends of the pole core to be coated.

[0022] Optionally, the thickness of the first cover plate is T 2 , the thickness of the second cover plate is T 3, the distance between the first cover plate and the second cover plate is L 1 ;

[0023] The length of the insulating film is L, 100 mm ≤ L ≤ 2000 mm, and L = L 1 -T 2 -T 3 .

[0024] According to a third aspect of the present invention, a battery module is provided, comprising a battery as described in any one of the second aspects.

[0025] According to a fourth aspect of the present invention, a battery pack is provided, comprising the battery module as described in the third aspect.

[0026] According to the fifth aspect of the utility model, an electrical device is provided, comprising an insulating film as described in any one of the first aspect, or a battery as described in any one of the second aspect, or a battery module as described in the third aspect, or a battery pack as described in the fourth aspect.

[0027] According to the insulating film provided by the embodiment of the utility model, the insulating film includes a first end, a second end and an indentation, the first end and the second end are two opposite ends of the insulating film; the indentation includes a first indentation and a second indentation, the first indentation is arranged between the first end and the second end and close to the first end; the second indentation is arranged between the first end and the second end and close to the second end; wherein the insulating film is used to cover at least part of the pole core, and the first indentation corresponds to the first edge of the pole core to be covered, the second indentation corresponds to the second edge of the pole core to be covered, and the distance between the first indentation and the second indentation is W 12 , the distance between the first edge and the second edge of the core to be coated is T, and 0≤W 12 -T≤0.5mm; by limiting the size of the insulating film and the pole core to be coated, it is effectively ensured that the insulating film does not squeeze the pole core to be coated when coating the pole core, which significantly improves the production quality of the battery.

[0028] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0030] Figure 1 It is a schematic structural diagram of an insulating film in one embodiment of the utility model.

[0031] Figure 2 It is an exploded view of a battery in one embodiment of the utility model.

[0032] Figure 3 It is a schematic structural diagram of an insulating film in another embodiment of the utility model.

[0033] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0034] Figure 5 It is a schematic structural diagram of a pole core and a cover plate in one embodiment of the utility model.

[0035] Figure 6 It is a structural schematic diagram of a cover plate in one embodiment of the utility model.

[0036] Description of reference numerals:

[0037] 1. Insulating film; 101. First film layer; 102. Second film layer; 103. Third film layer; 11. First end; 12. Second end; 13. Indentation; 131. First indentation; 132. Second indentation; 133. Third indentation; 134. Fourth indentation;

[0038] 2. The pole core to be coated; 21. The first edge; 22. The second edge; 23. The third edge; 24. The fourth edge;

[0039] 3. Shell;

[0040] 41. a first cover plate; 42. a second cover plate;

[0041] 5. Adhesive. DETAILED DESCRIPTION

[0042] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0043] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0044] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] According to an embodiment of the present application, an insulating film 1 is provided. Figures 1 to 6 , the insulating film 1 includes a first end 11, a second end 12 and an indentation 13, the first end 11 and the second end 12 are two opposite ends of the insulating film 1; the indentation 13 includes a first indentation 131 and a second indentation 132, the first indentation 131 is arranged between the first end 11 and the second end 12 and is close to the first end 11; the second indentation 132 is arranged between the first end 11 and the second end 12 and is close to the second end 12; wherein the insulating film 1 is used to cover at least part of the pole core 2 to be covered, and the first indentation 131 corresponds to the first edge 21 of the pole core 2 to be covered, the second indentation 132 corresponds to the second edge 22 of the pole core 2 to be covered, and the distance between the first indentation 131 and the second indentation 132 is W12 , the distance between the first edge 21 and the second edge 22 of the core 2 to be coated is T, and 0≤W 12 -T≤0.5mm.

[0049] Specifically, Figures 1 to 3 As shown, the insulating film 1 of the embodiment of the present application is used to cover the large surface and side surfaces of the pole core 2 to be coated, so that after the subsequent shell 3 covers the insulating film 1, the purpose of insulating the pole core 2 to be coated and the shell 3 can be effectively achieved. Of course, on the basis of satisfying the insulation performance between the pole core 2 to be coated and the shell 3, the insulating film 1 can also only cover the large surface of the pole core 2 to be coated, or only cover the side surfaces of the pole core 2 to be coated.

[0050] Among them, Figure 1 As shown, the distance between the first end 11 and the first indentation 131 of the insulating film 1 in the embodiment of the present application is W 1 , the distance between the second end 12 and the second indentation 132 is W 2 , and W 1 =W 2 .

[0051] Furthermore, in the embodiment of the present application, the insulating film 1 covers the pole core 2 to be covered, so that the first indentation 131 corresponds to the first edge 21, and the second indentation 132 corresponds to the second edge 22 of the pole core 2 to be covered. In this way, the distance W between the first indentation 131 and the second indentation 132 is 12 , and the distance T between the first edge 21 and the second edge 22 satisfies 0≤W 12 When -T≤0.5mm, it can effectively ensure that the insulating film 1 does not squeeze the pole core 2 to be coated when coating the pole core 2, thereby significantly improving the production quality of the battery.

[0052] In addition, it should be noted that the large surface of the pole core 2 to be coated described in the embodiment of the present application is the surface where the length direction of the pole core 2 to be coated intersects with the width direction of the pole core 2 to be coated, and the side surface of the pole core 2 to be coated is the surface where the width direction of the pole core 2 to be coated intersects with the height direction of the pole core 2 to be coated, that is, the portion between the first edge 21 and the second edge 22 of the pole core 2 to be coated is one side surface of the pole core 2 to be coated, and the portion between the third edge 23 and the fourth edge 24 of the pole core 2 to be coated is another side surface of the pole core 2 to be coated, the portion between the first edge 21 and the third edge 23 of the pole core 2 to be coated is a large surface of the pole core 2 to be coated, and the portion between the second edge 22 and the fourth edge 24 of the pole core 2 to be coated is another large surface of the pole core 2 to be coated.

[0053] Optionally, the indentation 13 further includes a third indentation 133, the third indentation 133 is disposed between the first indentation 131 and the second indentation 132 and close to the first indentation 131, and the distance between the first indentation 131 and the third indentation 133 is W. 3 ; wherein the third indentation 133 corresponds to the third edge 23 of the pole core 2 to be coated, the distance between the first edge 21 and the third edge 23 of the pole core 2 to be coated is W, and 0≤W 3 -W≤0.5mm.

[0054] Specifically, Figure 1 , Figure 2 and Figure 5 As shown, since the distance between the first edge 21 and the third edge 23 of the electrode core 2 to be coated is W, that is, the width of the large surface of the electrode core 2 to be coated is W, and 0≤W 3 -W≤0.5mm, so after the insulating film 1 between the first indentation 131 and the third indentation 133 partially covers a large surface of the pole core 2 to be coated, the large surface of the pole core 2 to be coated will not be squeezed, further improving the production quality of the battery and the assembly performance of the battery.

[0055] Optionally, the indentation 13 further includes a fourth indentation 134, the fourth indentation 134 is arranged between the first indentation 131 and the second indentation 132 and close to the second indentation 132, and the distance between the second indentation 132 and the fourth indentation 134 is W. 4 ; wherein the fourth indentation 134 corresponds to the fourth edge 24 of the pole core 2 to be coated, the distance between the second edge 22 and the fourth edge 24 of the pole core 2 to be coated is W, and 0≤W 4 -W≤0.5mm.

[0056] Specifically, Figure 1 , Figure 2 and Figure 5 As shown, since the distance between the second edge 22 and the fourth edge 24 of the electrode core 2 to be coated is W, that is, the width of the large surface of the electrode core 2 to be coated is W, and 0≤W 4 -W≤0.5mm, so after the insulating film 1 between the second indentation 132 and the fourth indentation 134 partially covers the other large surface of the pole core 2 to be coated, the other large surface of the pole core 2 to be coated will not be squeezed, further improving the production quality of the battery and the assembly performance of the battery.

[0057] Optionally, the distance between the third indentation 133 and the fourth indentation 134 is W 5, the distance between the third edge 23 and the fourth edge 24 of the core 2 to be coated is T, and 0≤W 5 -T≤0.5mm.

[0058] Specifically, Figure 1 , Figure 2 and Figure 5 As shown, since the distance between the third edge 23 and the fourth edge 24 of the pole core 2 to be coated is T, that is, the height of the side of the pole core 2 to be coated is T, and 0≤W 5 -T≤0.5mm, so when the insulating film 1 between the third indentation 133 and the fourth indentation 134 partially covers the other side of the pole core 2 to be coated, the other side of the pole core 2 to be coated will not be squeezed, further improving the production quality of the battery and the assembly performance of the battery.

[0059] Optionally, an overlapping depth of the insulating film portion between the first indentation and the first end and an overlapping depth of the insulating film portion between the second indentation and the second end is greater than or equal to 2 mm.

[0060] Specifically, Figures 1 to 3 As shown, when the first indentation 131 of the embodiment of the present application corresponds to the first edge 21, the second indentation 132 corresponds to the second edge 22 of the pole core 2 to be coated, and the overlapping depth of the insulating film portion between the first indentation 131 and the first end 11 and the insulating film portion between the second indentation 132 and the second end 12 is greater than or equal to 2 mm, that is, when the distance between the first edge 21 and the second edge 22 is T, the W 1 +W 2 - When T ≥ 2 mm, it is effectively ensured that there is an overlapping portion between the first indentation 131 of the insulating film 1 and the first end 11 and the second indentation 132 and the second end 12 of the insulating film 1, so that the edges of the insulating film 1 can be better hot-melted together, effectively ensuring the coating effect of the insulating film 1 and improving the insulation performance between the pole core 2 to be coated and the shell 3.

[0061] In addition, since there is an overlapping portion between the insulating film 1 portion between the first indentation 131 and the first end 11 and the insulating film 1 portion between the second indentation 132 and the second end 12, the tightness of the insulating film 1 can be adjusted when the insulating film 1 wraps the pole core 2 to be wrapped, so that the wrapping effect of the insulating film 1 can be adjusted according to the adaptability of the application environment of the pole core 2 to be wrapped, which significantly improves the wrapping quality of the insulating film 1 and effectively avoids the situation where the insulating film 1 is easily broken when wrapping the pole core 2 to be wrapped, resulting in poor wrapping effect, thereby greatly improving the production quality of the battery.

[0062] Optionally, the thickness of the insulating film 1 is T 1 , and 0.05mm≤T 1 ≤0.2mm.

[0063] Specifically, when the thickness T of the insulating film 1 is 1 When the thickness T of the insulating film 1 is too large, the insulating film 1 will squeeze the pole core 2 when covering the pole core 2 to be covered. 1 If the value is too small, the insulating film 1 will be broken when covering the pole core 2 to be covered.

[0064] Therefore, in order to ensure the production quality of the prepared battery, the thickness T of the insulating film 1 is preferably 1 The range is 0.05mm~0.2mm.

[0065] Optionally, the depth of the indentation 13 is D, and 0.2T 1 ≤D≤0.8T 1 .

[0066] Specifically, in the embodiment of the present application, the depth range of the indentation 13 is set to 0.2T. 1 ~0.8T 1 , effectively ensuring the integrity of the insulating film 1 when coating the electrode core 2 to be coated, avoiding the problem of the insulating film 1 being broken and causing the quality of the battery to deteriorate. Moreover, the embodiment of the present application sets the depth range of the indentation 13 to 0.2T 1 ~0.8T 1 It also effectively improves the coating efficiency of the insulating film 1 when coating the pole core 2 to be coated, further improving the production efficiency of the battery.

[0067] Optionally, the insulating film 1 is a PP (Polypropylene) film or a PET (Polyethylene Terephthalate) film.

[0068] Specifically, since the PP film has the advantages of light weight, high strength and hardness, and good heat resistance, the use performance of the prepared battery can be effectively improved by setting the insulating film 1 to be a PP film.

[0069] In addition, since the PET film has strong toughness and a high tensile strength and impact strength ratio, the insulating film 1 is set to be a PET film, which can effectively improve the coating efficiency of the insulating film 1 when coating the pole core 2 to be coated.

[0070] Optionally, the insulating film 1 includes a first film layer 101, a second film layer 102 and a third film layer 103, and the second film layer 102 is arranged between the first film layer 101 and the third film layer 103; wherein the first film layer 101 is a PP film, the second film layer 102 is a PET film, and the third film layer 103 is a PP film.

[0071] Specifically, since PP film has the advantages of light weight, high strength and hardness, and good heat resistance, and PET film has strong toughness and a high tensile strength and impact strength ratio, by setting the first film layer 101 of the insulating film 1 to be a PP film, the second film layer 102 to be a PET film, and the third film layer 103 to be a PP film, the performance and coating efficiency of the insulating film 1 can be significantly improved.

[0072] Among them, Figure 4 As shown, the first film layer 101 and the second film layer 102 can be connected together by an adhesive 5, and the second film layer 102 and the third film layer 103 can also be connected together by an adhesive 5. The adhesive can be polyurethane glue, acrylic glue or methacrylate glue, etc.

[0073] According to another embodiment of the present application, a battery is provided, comprising a pole core 2 to be coated, a shell 3 and an insulating film 1 as described in any one of the first aspects, wherein the insulating film 1 coats at least a portion of the pole core 2 to be coated, and the shell 3 covers at least a portion of the insulating film 1.

[0074] Specifically, Figure 2 As shown, the insulating film 1 described in the embodiment of the present application is used to cover at least a portion of the pole core 2 to be coated, and the shell 3 is used to cover at least a portion of the insulating film 1, thereby effectively ensuring the insulation performance between the pole core 2 to be coated and the shell 3.

[0075] Optionally, the battery further includes a first cover plate 41 and a second cover plate 42 , wherein the first cover plate 41 and the second cover plate 42 are respectively disposed at two ends of the pole core 2 to be coated.

[0076] Specifically, Figures 1 to 6As shown, in the embodiment of the present application, the first cover plate 41 and the second cover plate 42 are respectively arranged at the two ends of the pole core 2 to be coated, thereby effectively improving the performance of the battery.

[0077] Optionally, the thickness of the first cover plate 41 is T 2 , the thickness of the second cover plate 42 is T 3 , the distance between the first cover plate 41 and the second cover plate 42 is L 1 ; wherein the length of the insulating film 1 is L, 100mm≤L≤2000mm, and L=L 1 -T 2 -T 3 .

[0078] Specifically, Figures 1 to 6 As shown, since the distance between the first cover plate 41 and the second cover plate 42 of the pole core 2 to be coated in the embodiment of the present application is L 1 , that is, the shoulder height of the battery is L 1 Therefore, in the embodiment of the present application, the length of the insulating film 1 is set to L, 100mm≤L≤2000mm, and L=L 1 -T 2 -T 3 That is, in the embodiment of the present application, the length L of the insulating film 1 is set to be the shoulder height of the battery minus the thickness of the first cover plate 41 and the second cover plate 42, so that after the insulating film 1 covers the pole core 2 to be covered, the end of the insulating film 1 close to the first cover plate 41 can be hot-fused on the first cover plate 41, and the end of the insulating film 1 close to the second cover plate 42 can be hot-fused on the second cover plate 42, thereby effectively improving the stability and reliability of the insulating film 1.

[0079] According to another embodiment of the present application, a battery module is provided. The battery module includes the battery described in the embodiment of the present application.

[0080] According to another embodiment of the present application, a battery pack is provided, which includes the battery module described in the embodiment of the present application.

[0081] According to another embodiment of the present application, an electrical device is provided, which includes the insulating film 1 described in the embodiment of the present application, or includes the battery described in the embodiment of the present application, or includes the battery module described in the embodiment of the present application, or includes the battery pack described in the embodiment of the present application.

[0082] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0083] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An insulating film, characterized in that: include: A first end (11) and a second end (12), wherein the first end (11) and the second end (12) are two opposite ends of the insulating film (1); an indentation (13), the indentation (13) comprising a first indentation (131) and a second indentation (132), the first indentation (131) being arranged between the first end (11) and the second end (12) and being close to the first end (11); the second indentation (132) being arranged between the first end (11) and the second end (12) and being close to the second end (12); The insulating film (1) is used to cover at least a portion of the pole core (2) to be covered, and the first indentation (131) corresponds to the first edge (21) of the pole core (2) to be covered, the second indentation (132) corresponds to the second edge (22) of the pole core (2) to be covered, and the distance between the first indentation (131) and the second indentation (132) is W. 12 , the distance between the first edge (21) and the second edge (22) of the core (2) to be coated is T, and 0≤W 12 -T≤0.5mm.

2. The insulating film according to claim 1, wherein The indentation (13) further comprises a third indentation (133), wherein the third indentation (133) is arranged between the first indentation (131) and the second indentation (132) and is close to the first indentation (131), and the distance between the first indentation (131) and the third indentation (133) is W3; The third indentation (133) corresponds to the third edge (23) of the pole core (2) to be coated, the distance between the first edge (21) and the third edge (23) of the pole core (2) to be coated is W, and 0≤W3-W≤0.5mm.

3. The insulating film according to claim 2, characterized in that The indentation (13) further comprises a fourth indentation (134), wherein the fourth indentation (134) is arranged between the first indentation (131) and the second indentation (132) and is close to the second indentation (132), and the distance between the second indentation (132) and the fourth indentation (134) is W4; The fourth indentation (134) corresponds to the fourth edge (24) of the pole core (2) to be coated, the distance between the second edge (22) and the fourth edge (24) of the pole core (2) to be coated is W, and 0≤W4-W≤0.5mm.

4. The insulating film according to claim 3, characterized in that The distance between the third indentation (133) and the fourth indentation (134) is W5, the distance between the third edge (23) and the fourth edge (24) of the pole core (2) to be coated is T, and 0≤W5-T≤0.5mm.

5. The insulating film according to claim 1, wherein The overlapping depth of the insulating film portion between the first indentation (131) and the first end (11) and the insulating film portion between the second indentation (132) and the second end (12) is greater than or equal to 2 mm.

6. The insulating film according to claim 1, wherein The thickness of the insulating film (1) is T1, and 0.05 mm ≤ T1 ≤ 0.2 mm.

7. The insulating film according to claim 6, characterized in that The depth of the indentation (13) is D, and 0.2T1≤D≤0.8T1.

8. The insulating film according to claim 1, wherein The insulating film (1) is a PP film or a PET film.

9. The insulating film according to claim 1, wherein The insulating film comprises a first film layer (101), a second film layer (102) and a third film layer (103), wherein the second film layer (102) is arranged between the first film layer (101) and the third film layer (103); Wherein, the first film layer (101) is a PP film, the second film layer (102) is a PET film, and the third film layer (103) is a PP film.

10. A battery, characterized in that: It comprises a pole core (2) to be coated, a shell (3) and an insulating film (1) as described in any one of claims 1 to 9, wherein the insulating film (1) coats at least a portion of the pole core (2) to be coated, and the shell (3) covers at least a portion of the insulating film (1).

11. The battery according to claim 10, characterized in that It also comprises a first cover plate (41) and a second cover plate (42), wherein the first cover plate (41) and the second cover plate (42) are respectively arranged at two ends of the pole core (2) to be coated.

12. The battery according to claim 11, characterized in that The thickness of the first cover plate (41) is T2, the thickness of the second cover plate (42) is T3, and the distance between the first cover plate (41) and the second cover plate (42) is L1; Wherein, the length of the insulating film (1) is L, 100mm≤L≤2000mm, and L=L1-T2-T3.

13. A battery module, characterized in that: Comprising a battery as claimed in any one of claims 10 to 12.

14. A battery pack, characterized in that: Comprising the battery module as claimed in claim 13.

15. An electrical equipment, characterized in that: It comprises the insulating film (1) as claimed in any one of claims 1 to 9, or comprises the battery as claimed in any one of claims 10 to 12, or comprises the battery module as claimed in claim 13, or comprises the battery pack as claimed in claim 14.

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