Insulating film for battery, and battery

Abstract

An insulating film (100) for a battery, and the battery. The insulating film comprises a first sub-insulating film (10) and a second sub-insulating film (20) which are integrated and arranged in a first direction (X direction), wherein the first sub-insulating film (10) is provided with a first positioning hole (11), and the second sub-insulating film (20) is provided with a second positioning hole (21); and the first positioning hole (11) is a circular hole, the connecting line between the center point of the first positioning hole (11) and the center point of the second positioning hole (21) is a first extending straight line, and the extension direction of the second positioning hole (21) is the same as the extension direction of the first extending straight line.

Description

Insulating film for battery and battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202420015371.6 and application date of January 3, 2024, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to, but is not limited to, the field of battery technology, and in particular to an insulating film for a battery and a battery having the insulating film for a battery. Background Art

[0004] In the related art, during the battery manufacturing process, a membrane structure needs to be wrapped around the outside of the bare cell to ensure insulation between the bare cell and the aluminum shell. The membrane structure has positioning holes, and the positioning holes need to be coordinated 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 scratches, flanging, wrinkles and other defects in the membrane structure during the loading and assembly process, which in turn leads to low production yield. In addition, it will also lead to poor battery safety and prone to safety accidents.

[0005] Application Contents

[0006] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0007] To this end, one purpose of the present application is to propose an insulating film for a battery, which can cooperate smoothly and reliably with the tooling, is conducive to improving the yield rate, and can improve the safety of battery use.

[0008] The present application further proposes a battery.

[0009] According to the insulating film for a battery of the present application, the insulating film includes a first sub-insulating film and a second sub-insulating film that 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.

[0010] According to the insulating film for batteries of the present application, during the production process, after the first positioning hole is positioned with the tooling, since the second positioning hole is a compensation hole with 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 adverse problems (such as scratches, flanging, etc.) of the insulating film, which is beneficial to improving the yield rate, and can also improve the safety of battery use and reduce the probability of safety accidents.

[0011] In some examples of the present application, an extending direction of the first extending straight line has an angle with the first direction.

[0012] In some examples of the present application, 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 one of a circular hole and a compensation hole, and the second direction is perpendicular to the first direction.

[0013] In some examples of the present application, 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 a 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 circular hole or compensation hole; the line connecting the center point of the third positioning hole and the center point of the fourth positioning hole is a second extension straight line, the first extension straight line and the second extension straight line have the same extension direction, 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.

[0014] In some examples of the present application, 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.

[0015] In some examples of the present application, 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.

[0016] In some examples of the present application, 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.

[0017] In some examples of the present application, 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.

[0018] In some examples of the present application, at least one indentation is provided on the insulating film for bending the insulating film, and along the second direction of the insulating film, the width dimension of the indentation is C, satisfying the relationship: 0.5mm≤C≤1mm.

[0019] The battery according to the present application includes the above-mentioned insulating film for a battery.

[0020] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of a first embodiment of an insulating film according to an embodiment of the present application;

[0022] FIG2 is a schematic diagram of a second embodiment of an insulating film according to an embodiment of the present application;

[0023] FIG3 is a schematic diagram of a third embodiment of the insulating film according to the embodiment of the present application;

[0024] FIG4 is a schematic diagram of a fourth embodiment of the insulating film according to the embodiment of the present application;

[0025] FIG5 is a schematic diagram of a fifth embodiment of an insulating film according to an embodiment of the present application;

[0026] FIG6 is a schematic diagram of an insulating film according to an embodiment of the present application.

[0027] Reference numerals:

[0028] Insulating film 100;

[0029] First sub-insulating film 10; first positioning hole 11; third positioning hole 12; fifth positioning hole 13;

[0030] Second sub-insulating film 20; second positioning hole 21; fourth positioning hole 22;

[0031] Base material layer 30; Adhesive layer 31; Indentation 32. DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present application. 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 application and are not to be construed as limiting the present application.

[0033] An insulating film 100 for a battery according to an embodiment of the present application will be described below with reference to FIG. 1 to FIG. 6 .

[0034] As shown in Figures 1 to 6, the insulating film 100 according to an embodiment of the present application includes a first sub-insulating film 10 and a second sub-insulating film 20 that are integrally arranged, and the first sub-insulating film 10 and the second sub-insulating film 20 are arranged along the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1). As some embodiments of the present application, along the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1), an end of the first sub-insulating film 10 close to the second sub-insulating film 20 is connected to an end of the second sub-insulating film 20 close to the first sub-insulating film 10.

[0035] The first sub-insulating film 10 has a first positioning hole 11, which 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. The second sub-insulating film 20 has a second positioning hole 21, which 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 shown in some embodiments of the present application, with reference to Figures 1-5, the compensation hole can be configured as a racetrack-shaped hole. The racetrack-shaped hole can be understood as a rectangular hole with semicircular holes on both sides of the rectangular hole.

[0036] 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 line, and the extension direction of the second positioning hole 21 is the same as the extension direction of the first extension line. As some embodiments of the present application, referring to Figures 1 and 2, the extension direction of the first extension line can have an angle with the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1). In other words, the extension direction of the first extension line is not parallel to the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1), and the second positioning hole 21 is extended along the extension direction of the first extension line.

[0037] As some embodiments of the present application, as shown in Figures 3 to 5, the extension direction of the first extension line may be parallel to the first direction of the insulating film 100 (ie, the X direction shown in Figure 1), and the second positioning hole 21 is extended along the extension direction of the first extension line.

[0038] In the existing technology, 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 subject to 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 easily causes the membrane structure to be scratched, flanging, wrinkled and other adverse problems.

[0039] 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 of the battery cell, resulting in poor battery safety and prone to safety accidents.

[0040] 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.

[0041] This can be understood by comparison. If the second positioning hole 21 is also a circular 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, because 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 scratches, flanging, wrinkles and other defects on the insulating film 100. By constructing the second positioning hole 21 as a compensation hole with the same extension direction as the first extension 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 defects (such as scratches, flanging, etc.) on the insulating film 100.

[0042] 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 .

[0043] As shown in some embodiments of the present application, referring to Figures 1-5 , 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. The first, second, third, and fourth quadrants of the rectangular coordinate system are used to distinguish the locations of the first positioning hole 11 and the second positioning hole 21. The first sub-insulating film 10 is located in the first and fourth quadrants, and the second sub-insulating film 20 is located in the second and third quadrants. The vertical dashed lines in Figures 1-5 can be understood as the two axes of the rectangular coordinate system.

[0044] For example, referring to Figures 1 and 2, the extension direction of the first extension straight line may have an angle with the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1), and the second positioning hole 21 is extended along the extension direction of the first extension straight line. The second positioning hole 21 may be located in the second quadrant, and the first positioning hole 11 may be located in the fourth quadrant.

[0045] For example, referring to Figures 3-5, the extension direction of the first extension straight line can be parallel to the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1), and 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.

[0046] 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.

[0047] In some embodiments of the present application, as shown in Figures 1 and 2, the extension direction of the first extension straight line and the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1) may have an angle. As some embodiments of the present application, the 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 is extended along the extension direction of the first extension straight line. This arrangement enables the first positioning hole 11 and the second positioning hole 21 to cooperate with the positioning posts 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 identified through manual observation or through identification by the positioning posts of the tooling, it can be found that the insulating film 100 is placed upside down, thereby enabling the first positioning hole 11 and the second positioning hole 21 to have an anti-foolproof function.

[0048] It should be noted that the insulating film 100 can be wrapped around the surface of the battery cell. The insulating film 100 has a first surface and a second surface that are opposite to each other, with different roughness levels. Furthermore, one of the surfaces may be provided with an indentation 32. If the insulating film 100 is placed upside down, it will result in defective products. Therefore, by providing the first and second positioning holes 11 and 21 with foolproof features, loading consistency can be improved, significantly reducing the probability of the insulating film 100 being installed upside down on the battery cell, thereby improving the yield rate.

[0049] As shown in some embodiments of the present application, referring to Figures 3-5 , the extension direction of the first extension line can be parallel to the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1 ), and the second positioning hole 21 can be arranged to extend along the extension direction of the first extension 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. 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. This can also provide the first positioning hole 11 and the second positioning hole 21 with a fool-proof function, which is conducive to improving the yield rate.

[0050] In some embodiments of the present application, as shown in Figures 2 to 5, 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 constructed as a through hole, along the second direction of the insulating film 100 (that is, the Y direction shown in 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 compensation hole.

[0051] As some embodiments of the present application, as shown in Figure 2, the extension direction of the first extension straight line may have an angle with the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1), and 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 first quadrant, the third positioning hole 12 may be constructed as a circular hole, and the third positioning hole 12 may be spaced apart from the first positioning hole 11 along the second direction of the insulating film 100 (i.e., the Y direction shown in Figure 1).

[0052] As some embodiments of the present application, the extension direction of the first extension straight line may have an angle with the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1), and the third positioning hole 12 may be arranged 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 constructed as a circular hole, and the third positioning hole 12 may be spaced apart from the second positioning hole 21 along the second direction of the insulating film 100 (i.e., the Y direction shown in Figure 1).

[0053] As some embodiments of the present application, as shown in Figures 3 to 5, the extension direction of the first extension straight line can be parallel to the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1), and the third positioning hole 12 can be arranged in the first sub-insulating film 10. Specifically, the third positioning hole 12 can be located in the fourth quadrant, and the third positioning hole 12 can be constructed as a circular hole (as shown in Figure 3) or a compensation hole (as shown in Figures 4 and 5). The third positioning hole 12 can be spaced apart from the first positioning hole 11 along the second direction of the insulating film 100 (i.e., the Y direction shown in Figure 1).

[0054] 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-fouling role, 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.

[0055] The second direction of the insulating film 100 (ie, the Y direction shown in FIG. 1 ) is perpendicular to the first direction of the insulating film 100 (ie, the X direction shown in FIG. 1 ).

[0056] In some embodiments of the present application, as shown in Figures 3-5, the first sub-insulating film 10 may have a third positioning hole 12, and along the second direction of the insulating film 100 (i.e., the Y direction shown in Figure 1), the 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, and the fourth positioning hole 22 may be set through 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 constructed as a through hole, and along the second direction of the insulating film 100 (i.e., the Y direction shown in 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 one of a circular hole and a compensation hole, and the fourth positioning hole 22 may be the other of a circular hole and a compensation hole.

[0057] 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 directions of the first extension straight line and the second extension straight line can be the same. As some embodiments of the present application, referring to Figures 3-5, the extension direction of the first extension straight line can be parallel to the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1), and the extension direction of the second extension straight line can also be parallel to the first direction of the insulating film 100 (i.e., the X direction shown in Figure 1).

[0058] 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. 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.

[0059] As some embodiments of the present application, as shown in Figure 3, the third positioning hole 12 is a circular hole, and the fourth positioning hole 22 is a compensation hole. Along the second direction of the insulating film 100 (i.e., the Y direction shown in Figure 1), the third positioning hole 12 and the first positioning hole 11 are spaced apart, and the second positioning hole 21 and the fourth positioning hole 22 are spaced apart. Moreover, 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.

[0060] As some embodiments of the present application, referring to Figures 4 and 5, the third positioning hole 12 is a compensation hole, and the fourth positioning hole 22 is a circular hole. Along the second direction of the insulating film 100 (i.e., the Y direction shown in Figure 1), the third positioning hole 12 is spaced apart from the first positioning hole 11, and the second positioning hole 21 is spaced apart from the fourth positioning hole 22. Moreover, 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.

[0061] 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.

[0062] In some embodiments of the present application, as shown in Figure 5, 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.

[0063] In 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. In some embodiments of the present application, as shown in FIG5 , 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 line.

[0064] 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-fouling role, 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.

[0065] 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.

[0066] In some embodiments of the present application, as shown in Figures 1-5, the compensation hole can be configured as a rectangular hole, or the compensation hole can be configured as a circular 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 configured as a racetrack-shaped hole, in which the width of the rectangular hole is the same as the diameter of the semicircular hole. By configuring the compensation hole as a rectangular hole, a circular 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 post of the tooling, which is beneficial to reducing the probability of defects (such as scratches, flanging, etc.) of the insulating film 100 and improving the yield rate.

[0067] In some embodiments of the present application, as shown in Figure 6, along the thickness direction of the insulating film 100 (i.e., the Z direction shown in Figure 6), the insulating film 100 may include a stacked substrate layer 30 and an adhesive layer 31, and the substrate layer 30 is suitable for being adhered to the battery cell through the adhesive layer 31.

[0068] In the prior art, after the membrane is wrapped around the outside of the bare 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 wrapping around the bare cell once) so that the membrane is wrapped around the outside of the bare cell. This method makes it difficult to make the membrane fit the bare 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 cell is placed in the shell, the warped part is easily scratched by the mouth of the shell. After the scratch, the bare cell and the shell may come into contact at the wound, resulting in a risk of short circuit, thereby leading to serious safety accidents. In addition, the bare 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 cell expands, thereby affecting the working performance of the bare cell.

[0069] 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 on the battery cell, the substrate layer 30 can be well adhered 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 adhered 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.

[0070] In some embodiments of the present application, as shown in Figures 1 to 5, 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 can 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.

[0071] 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. A and B may satisfy the relationship: 0.4 ≤ A / B ≤ 1.5. In other words, 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.

[0072] 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 can 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 can 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 40 μm, the thickness of the insulating film 100 at the indentation 32 can be 60 μm, 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 30 μm, the thickness of the insulating film 100 at the indentation 32 can be 70 μm, 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.

[0073] This arrangement can make the ratio of 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 bent more easily, 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 wrapping process, thereby further improving the yield rate.

[0074] 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.

[0075] In some embodiments of the present application, along the second direction of the insulating film 100 (i.e., the Y direction shown in FIG1 ), the 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. This configuration can make the width dimension of the indentation 32 reasonable, and during the process of wrapping the insulating film 100 around the battery cell, the insulating film 100 can be more easily bent, enabling a smooth and stable process of wrapping the insulating film 100 around the battery cell.

[0076] According to the battery of the embodiment of the present application, 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.

[0077] 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 device or element referred to 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.

[0078] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0079] In the description of this application, “plurality” means two or more.

[0080] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0081] In the description of this application, a first feature “on”, “above” 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.

[0082] Throughout this specification, reference to terms such as "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 present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0083] Although the embodiments of the present application 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 purpose of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An insulating film for a battery, the insulating film comprising a first sub-insulating film and a second sub-insulating film that are integrated and arranged in a first direction of the insulating film, the first sub-insulating film having a first positioning hole, and the second sub-insulating film having a second positioning hole; The first positioning hole is a circular hole, the second positioning hole is a compensation hole, a connection line between the center point of the first positioning hole and the center point of the second positioning hole is a first extension line, and an extension direction of the second positioning hole is the same as an extension direction of the first extension line.

2. The insulating film for a battery according to claim 1, wherein, The extension direction of the first extension line has an included angle with the first direction.

3. The insulating film for a battery according to claim 1 or 2, wherein, The insulating film has a third positioning hole, along a second direction of the insulating film, the third positioning hole is spaced from the first positioning hole or the second positioning hole, the third positioning hole is one of 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, wherein, The first sub-insulating film has the third positioning hole, along the second direction, the third positioning hole is spaced from the first positioning hole, the second sub-insulating film has a fourth positioning hole, along the second direction, the second positioning hole is spaced from the fourth positioning hole, and the fourth positioning hole is the other of a circular hole or a compensation hole; A connection line between the center point of the third positioning hole and the center point of the fourth positioning hole is a second extension line, the extension direction of the first extension line is the same as the extension direction of the second extension 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 line.

5. The insulating film for a battery according to claim 4, wherein The insulating film has a fifth positioning hole, and the center point of the fifth positioning hole is located on the first extension line or the second extension line.

6. The insulating film for a battery according to any one of claims 1-5, wherein, The compensation hole is a rectangular hole or an arc-shaped hole; or the compensation hole is a rectangular hole, and semi-circular holes are provided on both sides of the rectangular hole.

7. The insulating film for a battery according to any one of claims 1-6, wherein, Along the thickness direction of the insulating film, the insulating film comprises a stacked base material layer and an adhesive layer, and the base material layer is adapted to be pasted on the battery cell through the adhesive layer.

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

5.

9. The insulating film for a battery according to any one of claims 1-8, wherein, At least one indentation is provided on the insulating film for bending the insulating film, along the second direction of the insulating film, a width dimension of the indentation is C, satisfying the relation: 0.5 mm ≤ C ≤ 1 mm.

10. A battery, comprising the insulating film for a battery according to any one of claims 1-9.

Images