Insulating film for battery and battery

Abstract

The insulating film comprises a first sub-insulating film and a second sub-insulating film which are integrated and arranged along a first direction, the first sub-insulating film is provided with a first positioning hole, and the second sub-insulating film is provided with a second positioning hole; the first positioning hole is a round hole, the connecting line of the center point of the first positioning hole and the center point of the second positioning hole is a first extending straight line, and the extending direction of the second positioning hole is the same as the extending direction of the first extending straight line. Therefore, in the production process, after the first positioning hole and the tool are positioned, due to the fact that the second positioning hole is the compensation hole in the same extension direction as the first extension straight line, the second positioning hole can achieve the compensation function so as to compensate the tolerance of the insulating film, and the second positioning hole can be matched with the tool; therefore, the probability of bad problems (such as scratches and flanging) of the insulating film can be reduced, the yield can be improved, the use safety of the battery can be improved, and the probability of safety accidents can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an insulating film for a battery and a battery having the insulating film for a battery. Background Art

[0002] In the related art, during the battery manufacturing process, a layer of membrane structure needs to be wrapped around the outside of the bare battery cell to ensure the insulation between the bare battery cell and the aluminum shell. The membrane structure has positioning holes, and the positioning holes need to cooperate with the tooling during the loading and assembly of the membrane structure. However, since the tooling is a machined part with a small tolerance, and the membrane structure is restricted by its shape and material, the spacing tolerance between the positioning holes is large, which leads to the loading and assembly process of the membrane structure, which is prone to scratches, flanging, wrinkles and other defects on the membrane structure, resulting in a low production yield. In addition, it will also lead to poor safety of battery use and prone to safety accidents. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide an insulating film for a battery, which can smoothly and reliably cooperate with a tooling, is conducive to improving the yield rate, and can improve the safety of the battery.

[0004] The utility model further provides a battery.

[0005] According to the insulating film for a battery of the utility model, the insulating film includes a first sub-insulating film and a second sub-insulating film which are integrated and arranged along a first direction of the insulating film, the first sub-insulating film has a first positioning hole, and the second sub-insulating film has a second positioning hole; the first positioning hole is a circular hole, and the second positioning hole is a compensation hole, the line connecting the center point of the first positioning hole and the center point of the second positioning hole is a first extension straight line, and the extension direction of the second positioning hole is the same as the extension direction of the first extension straight line.

[0006] According to the insulating film for batteries of the utility model, during the production process, after the first positioning hole is positioned with the tooling, since the second positioning hole is a compensation hole having the same extension direction as the first extension straight line, the second positioning hole can realize a compensation function to compensate for the tolerance of the insulating film, so that the second positioning hole can cooperate with the tooling, thereby reducing the probability of the insulating film having adverse problems (such as scratches, flanging, etc.), which is beneficial to improving the yield rate, and can also improve the safety of battery use and reduce the probability of safety accidents.

[0007] In some examples of the present invention, an extension direction of the first extension straight line has an angle with the first direction.

[0008] In some examples of the present invention, the insulating film has a third positioning hole, and along the second direction of the insulating film, the third positioning hole is spaced apart from the first positioning hole or the second positioning hole, the third positioning hole is a circular hole or a compensation hole, and the second direction is perpendicular to the first direction.

[0009] In some examples of the present invention, the first sub-insulating film has the third positioning hole, and along the second direction, the third positioning hole is spaced apart from the first positioning hole, and the second sub-insulating film has the fourth positioning hole, and along the second direction, the second positioning hole is spaced apart from the fourth positioning hole, and the fourth positioning hole is another kind of a circular hole or a compensation hole; the line connecting the center point of the third positioning hole and the center point of the fourth positioning hole is the second extension straight line, the first extension straight line has the same extension direction as the second extension straight line, and the extension direction of the compensation hole in the third positioning hole and the fourth positioning hole is the same as the extension direction of the second extension straight line.

[0010] In some examples of the present invention, the insulating film has a fifth positioning hole, and a center point of the fifth positioning hole is located on the first extension straight line or the second extension straight line.

[0011] In some examples of the present invention, the compensation hole is a rectangular hole or an arc-shaped hole; or the compensation hole is a rectangular hole, and both sides of the rectangular hole have semicircular holes.

[0012] In some examples of the present invention, along the thickness direction of the insulating film, the insulating film includes a stacked substrate layer and an adhesive layer, and the substrate layer is suitable for being adhered to the battery cell of the battery through the adhesive layer.

[0013] In some examples of the present invention, at least one indentation is provided on the insulating film for bending the insulating film. Along the thickness direction of the insulating film, the depth of the indentation is A, and the thickness of the insulating film at the indentation is B, satisfying the relationship: 0.4≤A / B≤1.5.

[0014] In some examples of the present invention, at least one indentation is provided on the insulating film for the insulating film to bend, and along the second direction of the insulating film, the width dimension of the indentation is C, satisfying the relationship: 0.5mm≤C≤1mm.

[0015] The battery according to the utility model comprises the above-mentioned insulating film for battery.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic diagram of a first embodiment of the insulating film according to an embodiment of the utility model;

[0019] Figure 2 is a schematic diagram of a second embodiment of the insulating film according to the embodiment of the utility model;

[0020] Figure 3 is a schematic diagram of a third embodiment of the insulating film according to the embodiment of the utility model;

[0021] Figure 4 is a schematic diagram of a fourth embodiment of the insulating film according to the embodiment of the utility model;

[0022] Figure 5 is a schematic diagram of a fifth embodiment of the insulating film according to the embodiment of the utility model;

[0023] Figure 6 It is a schematic diagram of the insulating film according to an embodiment of the utility model.

[0024] Reference numerals:

[0025] Insulating film 100;

[0026] A first sub-insulating film 10; a first positioning hole 11; a third positioning hole 12; a fifth positioning hole 13;

[0027] second sub-insulating film 20; second positioning hole 21; fourth positioning hole 22;

[0028] Base material layer 30; Adhesive layer 31; Indentation 32. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] Reference below Figure 1-Figure 6 An insulating film 100 for a battery according to an embodiment of the present invention is described.

[0031] like Figure 1-Figure 6 As shown, the insulating film 100 according to the embodiment of the present invention includes a first sub-insulating film 10 and a second sub-insulating film 20 which are integrally arranged, and along a first direction (ie, Figure 1 The first sub-insulating film 10 and the second sub-insulating film 20 are arranged. As some embodiments of the present application, along the first direction (ie, the X direction) of the insulating film 100 Figure 1 In the X direction shown in the figure, one end of the first sub-insulating film 10 close to the second sub-insulating film 20 is connected to one end of the second sub-insulating film 20 close to the first sub-insulating film 10.

[0032] The first sub-insulating film 10 has a first positioning hole 11, and the first positioning hole 11 can be set through the first sub-insulating film 10 along the thickness direction of the first sub-insulating film 10, that is, the first positioning hole 11 can be configured as a through hole, and the second sub-insulating film 20 has a second positioning hole 21, and the second positioning hole 21 can be set through the second sub-insulating film 20 along the thickness direction of the second sub-insulating film 20, that is, the second positioning hole 21 can be configured as a through hole. The first positioning hole 11 is a circular hole, and the second positioning hole 21 is a compensation hole, wherein the compensation hole can be configured as a rectangular hole, or the compensation hole can be configured as a circular arc hole, or, as some embodiments of the present application, refer to Figure 1-5 As shown, the compensation hole can be constructed as a racetrack-shaped hole, which can be understood as a rectangular hole, and both sides of the rectangular hole are semicircular holes.

[0033] The line connecting the center point of the first positioning hole 11 and the center point of the second positioning hole 21 is a first extension straight line, and the extension direction of the second positioning hole 21 is the same as the extension direction of the first extension straight line. Figure 1 and Figure 2 As shown, the extending direction of the first extension straight line is consistent with the first direction of the insulating film 100 (ie Figure 1 In other words, the extending direction of the first extension straight line and the first direction of the insulating film 100 (ie, the X direction shown in FIG. 1 ) may have an included angle. Figure 1 The second positioning hole 21 is not parallel to the X direction shown in the figure, and the second positioning hole 21 is extended along the extension direction of the first extension straight line.

[0034] As some embodiments of this application, refer to Figure 3-Figure 5 As shown, the extending direction of the first extension straight line is consistent with the first direction of the insulating film 100 (ie Figure 1 The first extension line may be parallel to the X direction shown in the figure, and the second positioning hole 21 is extended along the extension direction of the first extension line.

[0035] In the prior art, in the actual production process, the positioning holes on the membrane structure need to cooperate with the positioning columns of the tooling to carry out the loading and assembly process of the membrane structure. However, since the tooling is a machined part, the tolerance of the tooling is small, and the membrane structure is generally made of PP (polypropylene) and is very thin. The membrane structure is restricted by its shape, size and material, and the spacing tolerance between the positioning holes is large, which leads to the loading and assembly process of the membrane structure, which is easy to cause scratches, flanging, wrinkles and other defects on the membrane structure.

[0036] It is understandable that if the insulating film 100 is scratched, the probability of contact between the battery cell and the shell will increase, thereby increasing the probability of short circuit in the battery cell, resulting in poor safety of the battery and prone to safety accidents.

[0037] In the present application, by constructing the second positioning hole 21 as a compensation hole with the same extension direction as the first extension straight line, the second positioning hole 21 can realize a compensation function to compensate for the tolerance of the insulating film 100, so as to reduce the spacing tolerance between the first positioning hole 11 and the second positioning hole 21, so that the second positioning hole 21 can cooperate with the positioning column of the tooling.

[0038] This can be understood by comparison. If the second positioning hole 21 is also a round hole, assuming that the spacing tolerance between the two positioning posts of the tooling is ±0.3mm, and the insulating film 100 is subject to the shape, size and material, the spacing tolerance between the first positioning hole 11 and the second positioning hole 21 is ±0.5mm. After the first positioning hole 11 is positioned with the positioning post of the tooling, since the spacing tolerance between the first positioning hole 11 and the second positioning hole 21 is greater than the spacing tolerance between the two positioning posts of the tooling, the second positioning hole 21 cannot cooperate with the positioning post of the tooling, which can easily cause the insulating film 100 to be scratched, flanging, wrinkled and other defects. By constructing the second positioning hole 21 as a compensation hole with the same extension direction as the first extension straight line, after the first positioning hole 11 is positioned with the positioning post of the tooling, the second positioning hole 21 can smoothly cooperate with the positioning post of the tooling, thereby reducing the probability of the insulating film 100 having defects (such as scratches, flanging, etc.).

[0039] It should be explained that the first sub-insulating film 10 and the second sub-insulating film 20 can also be understood as dividing the insulating film 100 into two parts, so as to facilitate the identification and understanding of the positions of the first positioning hole 11 and the second positioning hole 21 .

[0040] As some embodiments of this application, refer to Figure 1-Figure 5As shown, a rectangular coordinate system can be established on the insulating film 100, the origin of the rectangular coordinate system is the center point of the insulating film 100, and the first quadrant, second quadrant, third quadrant, and fourth quadrant of the rectangular coordinate system are used to distinguish the setting positions of the first positioning hole 11 and the second positioning hole 21. The first sub-insulating film 10 is located in the first quadrant and the fourth quadrant, and the second sub-insulating film 20 is located in the second quadrant and the third quadrant. Figure 1-Figure 5 The vertical dotted lines in the figure can be understood as the two axes of the rectangular coordinate system.

[0041] For example, refer to Figure 1 and Figure 2 As shown, the extending direction of the first extension straight line is consistent with the first direction of the insulating film 100 (ie Figure 1 The second positioning hole 21 is extended along the extension direction of the first extension straight line, the second positioning hole 21 can be located in the second quadrant, and the first positioning hole 11 can be located in the fourth quadrant.

[0042] For example, refer to Figure 3-Figure 5 As shown, the extending direction of the first extension straight line is consistent with the first direction of the insulating film 100 (ie Figure 1 The second positioning hole 21 is extended along the extension direction of the first extension straight line, the second positioning hole 21 can be located in the second quadrant, and the first positioning hole 11 can be located in the first quadrant.

[0043] Therefore, during the production process, after the first positioning hole 11 is positioned with the tooling, since the second positioning hole 21 is a compensation hole with the same extension direction as the first extension straight line, the second positioning hole 21 can realize the compensation function to compensate for the tolerance of the insulating film 100, so that the second positioning hole 21 can cooperate with the tooling, thereby reducing the probability of the insulating film 100 having adverse problems (such as scratches, flanging, etc.), which is beneficial to improving the yield rate, and can also improve the safety of battery use and reduce the probability of safety accidents.

[0044] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the extending direction of the first extension straight line is consistent with the first direction of the insulating film 100 (ie Figure 1The second positioning hole 21 may be located in the second quadrant, the first positioning hole 11 may be located in the fourth quadrant, and the second positioning hole 21 may be extended along the extension direction of the first extension straight line. In this way, the first positioning hole 11 and the second positioning hole 21 cooperate with the positioning column of the tooling to accurately locate the position of the insulating film 100. Moreover, if the insulating film 100 is placed upside down, whether it is through manual observation and identification or through the positioning column of the tooling, it can be found that the insulating film 100 is placed upside down, so that the first positioning hole 11 and the second positioning hole 21 have an anti-foolproof function.

[0045] It should be noted that the insulating film 100 can be wrapped on the surface of the battery cell. The insulating film 100 has a first surface and a second surface relative to each other. The roughness of the first surface and the second surface is different. In addition, one of the surfaces is also provided with an indentation 32 structure. If the insulating film 100 is placed upside down, defective products will be produced. Therefore, by making the first positioning hole 11 and the second positioning hole 21 have a foolproof function, the consistency of loading can be improved, and the probability of the insulating film 100 being reversely assembled on the battery cell can be greatly reduced, which is conducive to improving the yield rate.

[0046] As some embodiments of this application, refer to Figure 3-Figure 5 As shown, the extending direction of the first extension straight line is consistent with the first direction of the insulating film 100 (ie Figure 1 The second positioning hole 21 is arranged to extend in the extension direction of the first extension straight line, and the second positioning hole 21 can be located in the second quadrant, and the first positioning hole 11 can be located in the first quadrant. Moreover, the distance between the second positioning hole 21 and the left edge of the insulating film 100 is different from the distance between the first positioning hole 11 and the right edge of the insulating film 100, so that the first positioning hole 11 and the second positioning hole 21 can have a foolproof function, which is conducive to improving the yield rate.

[0047] In some embodiments of the present invention, Figure 2-Figure 5 As shown, the insulating film 100 may have a third positioning hole 12, and the third positioning hole 12 may be arranged through the insulating film 100 along the thickness direction of the insulating film 100, that is, the third positioning hole 12 may be configured as a through hole, along the second direction (i.e. Figure 1 The third positioning hole 12 may be spaced apart from the first positioning hole 11, or the third positioning hole 12 may be spaced apart from the second positioning hole 21, and the third positioning hole 12 may be a circular hole or a compensating hole.

[0048] As some embodiments of this application, refer to Figure 2 As shown, the extending direction of the first extension straight line is consistent with the first direction of the insulating film 100 (ie Figure 1The third positioning hole 12 may be disposed in the first sub-insulating film 10. Specifically, the third positioning hole 12 may be located in the first quadrant. The third positioning hole 12 may be configured as a circular hole. The third positioning hole 12 may be aligned with the first positioning hole 11 along the second direction (i.e., Figure 1 The Y direction shown in the figure) interval setting.

[0049] As some embodiments of the present application, the extending direction of the first extension line is consistent with the first direction of the insulating film 100 (ie Figure 1 The third positioning hole 12 may be disposed in the second sub-insulating film 20. Specifically, the third positioning hole 12 may be located in the third quadrant. The third positioning hole 12 may be configured as a circular hole. The third positioning hole 12 may be disposed in the second direction (i.e., the X direction) of the insulating film 100. Figure 1 The Y direction shown in the figure) interval setting.

[0050] As some embodiments of this application, refer to Figure 3-Figure 5 As shown, the extending direction of the first extension straight line is consistent with the first direction of the insulating film 100 (ie Figure 1 The third positioning hole 12 may be arranged in the first sub-insulating film 10. Specifically, the third positioning hole 12 may be located in the fourth quadrant. The third positioning hole 12 may be configured as a circular hole (eg, Figure 3 as shown) or compensation holes (as Figure 4 , Figure 5 As shown), the third positioning hole 12 can be aligned with the first positioning hole 11 along the second direction of the insulating film 100 (ie Figure 1 The Y direction shown in the figure) interval setting.

[0051] By setting the third positioning hole 12, the third positioning hole 12 can play a positioning role, and the third positioning hole 12 can also play an anti-fool effect, thereby reducing the probability of the insulating film 100 having adverse problems (such as scratches, flanging, etc.), which is beneficial to improving the yield rate, and can also improve the safety of battery use and reduce the probability of safety accidents.

[0052] The second direction of the insulating film 100 (i.e. Figure 1 The Y direction shown in FIG. 1 is the same as the first direction of the insulating film 100 (ie, Figure 1 The X direction shown is perpendicular to the

[0053] In some embodiments of the present invention, Figure 3-Figure 5 As shown, the first sub-insulating film 10 may have a third positioning hole 12, along the second direction (ie, Figure 1The third positioning hole 12 may be spaced apart from the first positioning hole 11, and the second sub-insulating film 20 may have a fourth positioning hole 22, which may penetrate the second sub-insulating film 20 along the thickness direction of the second sub-insulating film 20, that is, the fourth positioning hole 22 may be configured as a through hole, along the second direction (i.e. Figure 1 The second positioning hole 21 may be spaced apart from the fourth positioning hole 22, wherein the third positioning hole 12 may be a circular hole or a compensating hole, and the fourth positioning hole 22 may be a circular hole or another compensating hole.

[0054] The line connecting the center point of the third positioning hole 12 and the center point of the fourth positioning hole 22 is the second extension straight line. The extension direction of the first extension straight line and the second extension straight line may be the same. As some embodiments of the present application, refer to Figure 3-Figure 5 As shown, the extending direction of the first extension straight line is consistent with the first direction of the insulating film 100 (ie Figure 1 The extending direction of the second extension straight line is parallel to the first direction of the insulating film 100 (ie, the X direction shown in FIG. 1 ). Figure 1 The X direction shown) can also be parallel.

[0055] The extension direction of the compensation holes in the third positioning hole 12 and the fourth positioning hole 22 is the same as the extension direction of the second extension straight line. It can be understood that if the third positioning hole 12 is a circular hole, the fourth positioning hole 22 is a compensation hole, and if the fourth positioning hole 22 is a circular hole, the third positioning hole 12 is a compensation hole. Regardless of whether the third positioning hole 12 is a compensation hole or the fourth positioning hole 22 is a compensation hole, the extension direction of the compensation holes in the third positioning hole 12 and the fourth positioning hole 22 is the same as the extension direction of the second extension straight line.

[0056] As some embodiments of this application, refer to Figure 3 As shown, the third positioning hole 12 is a circular hole, and the fourth positioning hole 22 is a compensation hole, which is formed along the second direction (i.e. Figure 1 The third positioning hole 12 is spaced apart from the first positioning hole 11, the second positioning hole 21 is spaced apart from the fourth positioning hole 22, and the extension direction of the first extension straight line, the extension direction of the second extension straight line, and the first direction of the insulating film 100 are parallel to each other. The third positioning hole 12 can be located in the fourth quadrant, and the fourth positioning hole 22 can be located in the third quadrant.

[0057] As some embodiments of this application, refer to Figure 4 and Figure 5 As shown, the third positioning hole 12 is a compensation hole, and the fourth positioning hole 22 is a circular hole, along the second direction (ie, Figure 1The third positioning hole 12 is spaced apart from the first positioning hole 11, the second positioning hole 21 is spaced apart from the fourth positioning hole 22, and the extension direction of the first extension straight line, the extension direction of the second extension straight line, and the first direction of the insulating film 100 are parallel to each other. The third positioning hole 12 can be located in the fourth quadrant, and the fourth positioning hole 22 can be located in the third quadrant.

[0058] Such a configuration can ensure accurate positioning of the insulating film 100 during the production process, reduce the probability of the insulating film 100 having defects (such as scratches, flanging, etc.), and help improve the yield rate.

[0059] In some embodiments of the present invention, Figure 5 As shown, the insulating film 100 may have a fifth positioning hole 13, and the fifth positioning hole 13 may be arranged through the insulating film 100 along the thickness direction of the insulating film 100, that is, the fifth positioning hole 13 may be constructed as a through hole, and the center point of the fifth positioning hole 13 may be located on the first extension straight line, or the center point of the fifth positioning hole 13 may be located on the second extension straight line.

[0060] As some embodiments of the present application, the fifth positioning hole 13 may be located in the first sub-insulating film 10, or the fifth positioning hole 13 may be located in the second sub-insulating film 20. As some embodiments of the present application, refer to Figure 5 As shown, the fifth positioning hole 13 may be located in the first sub-insulating film 10 , and the fifth positioning hole 13 may be located in the fourth quadrant, and the center point of the fifth positioning hole 13 may be located on the second extension straight line.

[0061] By setting the fifth positioning hole 13, the fifth positioning hole 13 can play a positioning role, and the fifth positioning hole 13 can also play an anti-fool effect, thereby reducing the probability of the insulating film 100 having adverse problems (such as scratches, flanging, etc.), which is beneficial to improving the yield rate, and can also improve the safety of battery use and reduce the probability of safety accidents.

[0062] As some embodiments of the present application, in the first positioning hole 11, the second positioning hole 21, the third positioning hole 12, the fourth positioning hole 22, and the fifth positioning hole 13, the diameter of the round hole can be any value between 3 mm and 5 mm, and in the first positioning hole 11, the second positioning hole 21, the third positioning hole 12, the fourth positioning hole 22, and the fifth positioning hole 13, the length of the runway hole can be any value between 5 mm and 10 mm, and the width of the runway hole can be any value between 3 mm and 5 mm.

[0063] In some embodiments of the present invention, Figure 1-Figure 5As shown, the compensation hole can be constructed as a rectangular hole, or the compensation hole can be constructed as an arc hole, or the compensation hole can be a rectangular hole, and both sides of the rectangular hole can have semicircular holes, that is, the compensation hole can be constructed as a racetrack-shaped hole, in which the width of the rectangular hole is the same as the diameter of the semicircular hole. By constructing the compensation hole as a rectangular hole, an arc hole or a racetrack-shaped hole, the arrangement of the compensation hole can be reasonable, and the compensation hole can be better matched with the positioning column of the tooling, which is beneficial to reduce the probability of the insulating film 100 having adverse problems (such as scratches, flanging, etc.), and is beneficial to improve the yield rate.

[0064] In some embodiments of the present invention, Figure 6 As shown, along the thickness direction of the insulating film 100 (ie Figure 6 The insulating film 100 may include a stacked substrate layer 30 and an adhesive layer 31 , wherein the substrate layer 30 is suitable for being adhered to the battery cell through the adhesive layer 31 .

[0065] In the prior art, after the membrane is wrapped around the outside of the bare battery cell, the two joints of the membrane are fixed by tape (this can be understood as one side of the membrane is stationary, and the other side is fixed to one side of the membrane by tape after being wrapped around the bare battery cell once), so that the membrane is wrapped around the outside of the bare battery cell. This method makes it difficult to make the membrane fit the bare battery cell well, and it will cause some part of the membrane (such as the tape fitting part) to warp up. In this way, when the bare battery cell is installed in the shell, the warped part is easily scratched by the mouth of the shell. After scratching, there is a risk of short circuit between the bare battery cell and the shell at the wound, thereby causing serious safety accidents. In addition, the bare battery cell will expand during use. Since the tape itself has a certain thickness, the force at the tape will be inconsistent with the force at other places when the bare battery cell expands, thereby affecting the working performance of the bare battery cell.

[0066] In the present application, an adhesive layer 31 is provided on the surface of the substrate layer 30, so that when the substrate layer 30 is pasted to the battery cell, the substrate layer 30 can be well attached to the surface of the battery cell, which can reduce the probability of a certain part of the substrate layer 30 being lifted up, thereby reducing the probability of the lifted substrate layer 30 being scratched by the shell when the battery cell is installed in the shell, which is beneficial to improving the yield rate. In addition, the thickness of the substrate layer 30 attached to various parts of the battery cell surface can be made highly consistent, so that the force at various parts can be made consistent when the battery cell expands, which is beneficial to improving the performance of the battery cell.

[0067] In some embodiments of the present invention, Figure 1-Figure 5As shown, at least one indentation 32 may be provided on the insulating film 100 for bending the insulating film 100. It should be noted that the insulating film 100 may be wrapped around the outside of the battery cell. Taking the battery cell of a square lithium-ion blade battery as an example, four indentations 32 may be provided on the insulating film 100 for bending the insulating film 100, so that the insulating film 100 can be easily bent, thereby enabling the process of wrapping the insulating film 100 around the battery cell to be smooth and stable.

[0068] Along the thickness direction of the insulating film 100, the depth of the indentation 32 may be A, and the thickness of the insulating film 100 at the indentation 32 may be B, and A and B may satisfy the relationship: 0.4≤A / B≤1.5. That is, the ratio of the depth of the indentation 32 to the thickness of the insulating film 100 at the indentation 32 may be any value between 0.4 and 1.5, for example, the ratio of the depth of the indentation 32 to the thickness of the insulating film 100 at the indentation 32 may be, but is not limited to, 0.4, 0.8, 1.2, 1.5, etc.

[0069] Taking the thickness of the insulating film 100 as 100 μm as an example, when the depth of the indentation 32 is 60 μm, the thickness of the insulating film 100 at the indentation 32 may be 40 μm, and the ratio of the depth of the indentation 32 to the thickness of the insulating film 100 at the indentation 32 is 1.5; when the depth of the indentation 32 is 50 μm, the thickness of the insulating film 100 at the indentation 32 may be 50 μm, and the ratio of the depth of the indentation 32 to the thickness of the insulating film 100 at the indentation 32 is 1.5. The ratio of the thickness is 1; when the depth of the indentation 32 is 40μm, the thickness of the insulating film 100 at the indentation 32 can be 60μm, and the ratio of the depth of the indentation 32 to the thickness of the insulating film 100 at the indentation 32 is 0.67; when the depth of the indentation 32 is 30μm, the thickness of the insulating film 100 at the indentation 32 can be 70μm, and the ratio of the depth of the indentation 32 to the thickness of the insulating film 100 at the indentation 32 is 0.429.

[0070] This arrangement can make the ratio between the depth of the indentation 32 and the thickness of the insulating film 100 at the indentation 32 reasonable. In the process of wrapping the insulating film 100 on the battery cell, the insulating film 100 can be more easily bent, and the process of wrapping the insulating film 100 on the battery cell can be smooth and stable. Moreover, in the process of wrapping the insulating film 100 on the battery cell, it is not easy to pull the diaphragm of the battery cell, which can reduce the probability of the diaphragm being offset due to the coating process, thereby further improving the yield rate.

[0071] In addition, it should be noted that by making the positioning hole have a fool-proof function, it can be ensured that the indentation 32 faces the battery cell, thereby ensuring the smooth progress of the production process.

[0072] In some embodiments of the present invention, along the second direction (i.e. Figure 1The width dimension of the indentation 32 may be C, and C may satisfy the relationship: 0.5 mm ≤ C ≤ 1 mm. In other words, the width dimension of the indentation 32 may be any value between 0.5 mm and 1 mm. For example, the width dimension of the indentation 32 may be, but is not limited to, 0.5 mm, 0.75 mm, 1 mm, etc. Such a setting may make the width dimension of the indentation 32 reasonable, and in the process of wrapping the insulating film 100 on the battery cell, the insulating film 100 may be easier to bend, and the process of wrapping the insulating film 100 on the battery cell may be smooth and stable.

[0073] According to the battery of the embodiment of the utility model, including the above-mentioned insulating film 100 for the battery, during the production process, after the first positioning hole 11 is positioned with the tooling, since the second positioning hole 21 is a compensation hole with the same extension direction as the first extension straight line, the second positioning hole 21 can realize the compensation function to compensate for the tolerance of the insulating film 100, so that the second positioning hole 21 can cooperate with the tooling, thereby reducing the probability of the insulating film 100 having adverse problems (such as scratches, flanging, etc.), which is beneficial to improving the yield rate, and can also improve the safety of battery use and reduce the probability of safety accidents.

[0074] In the description of the present invention, 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 invention 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 invention.

[0075] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0076] In the description of the present invention, "plurality" means two or more.

[0077] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0078] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0080] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An insulating film for a battery, characterized in that: The insulating film includes a first sub-insulating film and a second sub-insulating film which are integrally arranged along a first direction of the insulating film, the first sub-insulating film has a first positioning hole, and the second sub-insulating film has a second positioning hole; The first positioning hole is a circular hole, the second positioning hole is a compensation hole, a line connecting the center point of the first positioning hole and the center point of the second positioning hole is a first extension straight line, and an extension direction of the second positioning hole is the same as an extension direction of the first extension straight line.

2. The insulating film for a battery according to claim 1, characterized in that: An extending direction of the first extending straight line forms an angle with the first direction.

3. The insulating film for a battery according to claim 1, characterized in that: The insulating film has a third positioning hole, and along the second direction of the insulating film, the third positioning hole is spaced apart from the first positioning hole or the second positioning hole, the third positioning hole is a circular hole or a compensation hole, and the second direction is perpendicular to the first direction.

4. The insulating film for a battery according to claim 3, characterized in that: The first sub-insulating film has the third positioning hole, and along the second direction, the third positioning hole is spaced apart from the first positioning hole; the second sub-insulating film has the fourth positioning hole, and along the second direction, the second positioning hole is spaced apart from the fourth positioning hole, and the fourth positioning hole is another of a circular hole and a compensation hole; The line connecting the center point of the third positioning hole and the center point of the fourth positioning hole is the second extension straight line, the first extension straight line has the same extension direction as the second extension straight line, and the extension direction of the compensation holes in the third positioning hole and the fourth positioning hole is the same as the extension direction of the second extension straight line.

5. The insulating film for a battery according to claim 4, characterized in that: The insulating film has a fifth positioning hole, and a center point of the fifth positioning hole is located on the first extending straight line or the second extending straight line.

6. The insulating film for a battery according to claim 1, characterized in that: The compensation hole is a rectangular hole or an arc-shaped hole; or the compensation hole is a rectangular hole, and both sides of the rectangular hole have semicircular holes.

7. The insulating film for a battery according to claim 1, characterized in that: Along the thickness direction of the insulating film, the insulating film includes a stacked substrate layer and an adhesive layer, and the substrate layer is suitable for being adhered to the battery cell of the battery through the adhesive layer.

8. The insulating film for a battery according to any one of claims 1 to 7, characterized in that: At least one indentation is provided on the insulating film for bending the insulating film. Along the thickness direction of the insulating film, the depth of the indentation is A, and the thickness of the insulating film at the indentation is B, satisfying the relationship: 0.4≤A / B≤1.

5.

9. The insulating film for a battery according to any one of claims 1 to 7, characterized in that: At least one indentation is provided on the insulating film for the insulating film to bend, and along the second direction of the insulating film, the width dimension of the indentation is C, satisfying the relationship: 0.5mm≤C≤1mm.

10. A battery, characterized in that: The invention comprises an insulating film for a battery according to any one of claims 1 to 9.

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