Insulating film and battery cell

Abstract

The embodiment of the application provides an insulating film and a battery cell, and belongs to the technical field of battery manufacturing. The insulating film comprises: an insulating film body; a crease line group, the crease line group is arranged at intervals on the insulating film body and is at least two, each crease line group comprises at least two parallel and spaced crease lines; the insulating film body is configured to be bent along the crease line, so as to form a transition part corresponding to the crease line group, and the transition part is arranged between the edge of the battery cell and the fillet of the shell. After the insulating film is bent along the crease line, the sharpness of the bending part is low, the possibility of interference or sliding between the bending part of the insulating film and the fillet structure of the shell is reduced, and the insulating film is more easily loaded into the shell.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to an insulating film and a battery cell. Background Technology

[0002] During the battery production process, the battery cells need to be wrapped in an insulating film and then installed in a casing to form a battery cell.

[0003] In the prior art, the cross-section of the battery cell is rectangular, and multiple fold lines are set on the insulating film to match the corresponding edges of the battery cell one by one. The insulating film is folded along the fold lines, which makes it easy to wrap the battery cell.

[0004] However, after the insulating film is wrapped around the battery cell, sharp corners will be formed at the edges of the battery cell, making it difficult to install it into the casing smoothly. Utility Model Content

[0005] This application provides an insulating film and a battery cell to solve the problem in the prior art where the insulating film, after wrapping the battery cell, forms sharp corners at the edges of the battery cell, making it difficult to smoothly install it into the casing.

[0006] In a first aspect, embodiments of this application provide an insulating film, comprising:

[0007] Insulating film body;

[0008] A set of crease lines, wherein at least two crease lines are spaced apart on the insulating film body.

[0009] Each of the aforementioned crease line groups includes at least two parallel and spaced crease lines;

[0010] The insulating film body is configured to be bent along the crease lines to form a transition portion corresponding to the crease line group, the transition portion being disposed between the edge of the battery cell and the rounded corner of the outer casing.

[0011] In one possible implementation, the insulating film provided in this application embodiment forms a transition segment between two adjacent crease lines. The transition segment includes at least two transition segments. There is an angle between two adjacent transition segments and between the transition segment and the insulating film body. The angle is greater than 90° and less than 180°.

[0012] In one possible implementation, the insulating film provided in this application embodiment has the same spacing between two adjacent crease lines within the same crease line group.

[0013] In one possible implementation, the insulating film provided in this application embodiment has an even number of transition segments.

[0014] In one possible implementation, the insulating film provided in this application embodiment has a crease line that is a groove provided along the extending direction of the crease line.

[0015] In one possible implementation, the insulating film provided in this application embodiment has four sets of crease lines spaced apart along the width direction of the insulating film body.

[0016] In one possible implementation, the insulating film provided in this application embodiment has each of the crease lines extending along the length direction of the insulating film body.

[0017] In one possible implementation, the insulating film provided in this application embodiment has each of the crease lines connected to the two edges of the insulating film body along the width direction.

[0018] In one possible implementation, the insulating film provided in this application embodiment,

[0019] There is a first interval between two adjacent sets of crease lines, the first interval being adapted to the length of the battery cell;

[0020] Alternatively, there may be a second gap between two adjacent sets of crease lines, the second gap being adapted to the width of the battery cell;

[0021] Furthermore, each of the two sets of crease lines adjacent to the two edges along the length direction of the insulating film body has a third interval between it and the corresponding edge along the length direction of the insulating film body, and the two third intervals are equal.

[0022] Secondly, embodiments of this application provide a battery cell, including a battery cell, a casing, and any of the aforementioned insulating films. The insulating film covers the outer periphery of the battery cell and is disposed together with the battery cell within the casing.

[0023] The insulating film and battery cell provided in this application embodiment have at least two crease line groups on the insulating film body, each crease line group including at least two crease lines. This allows the insulating film to bend along the crease lines when it is bent to wrap the battery cell, forming a transition portion corresponding to the crease line group. Since each crease line group includes at least two spaced crease lines, after the transition portion is formed, the at least two crease lines can be located on opposite sides of the edge extension direction, thereby mitigating the sharp angle at the edge. Compared to setting only one crease line to form a sharp 90° bending angle at the edge, the transition portion formed after the insulating film is bent along the crease line provided in this application has a lower degree of sharpness and is closer to the rounded corner structure of the outer casing. Therefore, when the battery cell wrapped with the insulating film is installed into the outer casing, the bent part of the insulating film fits more closely with the rounded corner structure of the outer casing, reducing the possibility of interference or slippage between the bent part of the insulating film and the rounded corner structure of the outer casing, making it easier to install into the outer casing. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] Figure 1 This is a schematic diagram of the structure of the insulating film provided in the embodiments of this application;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of an insulating film applied to a battery cell;

[0027] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0028] Figure 4 for Figure 3 A schematic diagram of the bending of the insulating film.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100 - Insulating film; 110 - Insulating film body; 111 - First edge; 112 - Second edge; 113 - Transition portion; 1131 - Transition section; 120 - Crease line group; 121 - Crease line;

[0031] 200 - Cell; 210 - Edge;

[0032] 300 - Outer shell; 310 - Rounded corners.

[0033] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the absence of conflict, the following embodiments and features can be combined with each other.

[0035] In existing technology, the battery cell has a rectangular cross-section, and multiple fold lines are set on the insulating film to match the corresponding edges of the battery cell. During operation, the insulating film is laid flat on the workbench, the battery cell is placed on the insulating film, and the insulating film is folded along the fold lines to wrap the battery cell.

[0036] However, after the insulating film wraps the battery cell, the creases correspond to the edges of the cell, creating sharp corners that align with the edges. The outer casing housing the battery cell has rounded corners at these corresponding edges. When the insulating film-wrapped battery cell needs to be inserted into the casing, the sharp corners of the insulating film can easily slip or interfere at the rounded corners, causing the battery cell to become difficult to insert smoothly.

[0037] To overcome the deficiencies in the prior art, the insulating film and battery cell provided in this application embodiment have at least two crease line groups on the insulating film body, each crease line group including at least two crease lines. This allows the insulating film to bend along the crease lines when it is bent to wrap the battery cell, forming a transition portion corresponding to the crease line group. Since each crease line group includes at least two spaced crease lines, after the transition portion is formed, the at least two crease lines can be located on opposite sides of the edge extension direction, thereby mitigating the sharp angle at the edge. Compared to setting only one crease line to form a sharp 90° bending angle at the edge, the transition portion formed after the insulating film is bent along the crease line provided in this application has a lower degree of sharpness and is closer to the rounded corner structure of the outer casing. Therefore, when the battery cell wrapped with the insulating film is installed into the outer casing, the bent part of the insulating film fits more closely with the rounded corner structure of the outer casing, reducing the possibility of interference or slippage between the bent part of the insulating film and the rounded corner structure of the outer casing, making it easier to install into the outer casing.

[0038] The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the present invention.

[0039] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this application embodiment provides an insulating film 100, comprising:

[0040] Insulating film body 110;

[0041] Crease line group 120, at least two crease line groups 120 are provided at intervals on the insulating film body 110.

[0042] Each crease line group 120 includes at least two parallel and spaced crease lines 121;

[0043] The insulating film body 110 is configured to be bent along the crease line 121 to form a transition portion 113 corresponding to the crease line group 120. The transition portion 113 is used to be disposed between the edge 210 of the cell 200 and the rounded corner 310 of the housing 300.

[0044] It is understood that the insulating film body 110 can be a thin film with a certain degree of flexibility, such as a polypropylene film, polyethylene film, polyimide film, or polyester film. After setting the crease line group 120 on it, the insulating film body 110 can be bent or folded along the crease line group 120.

[0045] The degree of bending of the insulating film body 110 along the crease line group 120 depends on various factors such as the bendability of the insulating film body 110 material, the thickness of the insulating film body 110, the form of the crease line 121 in the crease line group 120, and the depth of the crease line 121. This application does not impose specific restrictions on these factors.

[0046] The crease line group 120 includes at least two crease lines 121, which are distributed on opposite sides of the edge 210 of the cell 200 after the insulating film body 110 forms the transition portion 113. This results in a smoother transition portion 113 at the edge 210 compared to a 90° sharp angle after the insulating film body 110 is bent along the crease lines 121, thereby eliminating the sharp angle structure between the edge 210 of the cell 200 and the rounded corner 310 of the outer casing 300.

[0047] Therefore, the insulating film 100 provided in this embodiment of the application has at least two crease line groups 120 provided on the insulating film body 110, each crease line group 120 including at least two crease lines 121. In this way, when the insulating film 100 is bent and wrapped around the battery cell 200, the insulating film 100 can be bent along the crease lines 121, and a transition portion 113 is formed corresponding to the crease line group 120. Since each crease line group 120 includes at least two spaced crease lines 121, after the transition portion 113 is formed, at least two crease lines 121 are located on opposite sides of the edge 210 extending direction, thereby the transition portion 113 alleviates the sharp corners at the edge 210.

[0048] Compared to simply setting a crease line 121 to form a sharp 90° bend at the edge 210, the transition portion 113 formed by the insulating film 100 in this application after bending along the crease line 121 has a lower sharpness and is closer to the rounded corner 310 structure of the outer casing 300. Therefore, when the battery cell 200 wrapped with the insulating film 100 is installed into the outer casing 300, the bent part of the insulating film 100 fits more closely with the rounded corner 310 structure of the outer casing 300, reducing the possibility of interference or slippage between the bent part of the insulating film 100 and the rounded corner 310 structure of the outer casing 300, and making it easier to install into the outer casing 300.

[0049] In some embodiments, refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a transition section 1131 is formed between two adjacent crease lines 121. The transition section 113 includes at least two transition sections 1131. There is an included angle α between two adjacent transition sections 1131 and between the transition section 1131 and the insulating film body 110. The included angle α is greater than 90° and less than 180°.

[0050] It is understood that by bending the insulating film body 110 along each crease line 121 in the crease line group 120, a transition section 1131 can be formed between two adjacent crease lines 121. That is, a crease line group 120 corresponds to a transition section 113, and N crease lines 121 in the crease line group 120 can correspond to N-1 transition sections 1131 in the transition section 113. The spacing between the two outermost crease lines 121 within the crease line group 120 corresponds to the width of the crease line group 120, so that the width of the crease line group 120 matches the arc length of the rounded corner 310 of the outer shell 300. By coordinating the depth and number of crease lines 121 within the crease line group 120, the radius of curvature of the insulating film body 110 after bending along the crease line group 120 at the transition portion 113 is closer to the radius of curvature at the rounded corner 310 of the outer shell 300, thereby making the transition portion 113 and the rounded corner 310 fit together.

[0051] Specifically, the angle α between two adjacent transition sections 1131 and between the transition section 1131 and the insulating film body 110 is greater than 90° and less than 180°. This allows the transition section 113 to form a curved, arc-shaped structure with a smooth curve, which facilitates fitting with the rounded corner 310 of the outer shell 300. This improves the compatibility between the insulating film 100 and the outer shell 300, reduces assembly difficulties caused by size mismatch, and thus reduces the possibility that the battery cell 200 is difficult to install into the outer shell 300, thereby improving production efficiency.

[0052] Furthermore, in some embodiments, reference is made to Figure 1 As shown, within the same crease line group 120, the spacing between two adjacent crease lines 121 is consistent.

[0053] It is easy to understand that the consistent spacing allows the insulating film body 110 to form a regular and uniform transition portion 113 when bent along the crease line 121, so that the structure of the transition portion 113 can better conform to the shape of the rounded corner 310 of the outer shell 300, thereby adapting the rounded corner 310 of the outer shell 300 to prevent the transition portion 113 from being irregular and difficult to fit with the rounded corner 310 of the outer shell 300 due to different spacing of the crease line 121.

[0054] This creates a regular, rounded corner 310 structure, which allows the insulating film 100 to wrap the battery cell 200 more smoothly and be installed into the housing 300, reducing obstacles and adjustments during assembly and further improving assembly efficiency.

[0055] It should be noted that, since the overall width of a single crease line group 120 needs to correspond to the arc length of the rounded corner 310 of the outer shell 300, as the number of crease lines 121 in the crease line group 120 increases, the spacing between two adjacent crease lines 121 decreases, and the radius of curvature of the resulting transition part 113 structure is closer to the rounded corner 310 of the outer shell 300, and it fits the rounded corner 310 of the outer shell 300 better, but the corresponding processing difficulty will also increase.

[0056] When the number of crease lines 121 in the crease line group 120 is too large, the degree of bending of the insulating film 100 at each crease line 121 in the crease line group 120 will be inconsistent. The crease lines 121 near the edge 210 will be bent significantly, while the crease lines 121 far from the edge 210 will be bent less significantly or not at all, making it difficult to make full use of each crease line 121. Therefore, the number of crease lines 121 needs to be set according to the specific working conditions.

[0057] In specific implementation, refer to Figure 1 and Figure 3 As shown, the number of transition segments 1131 is an even number.

[0058] When the number of transition segments 1131 is even, the number of crease lines 121 in the crease line group 120 corresponding to the transition segment 1131 is odd. At this time, one crease line 121 will be aligned with the edge 210, and the remaining crease lines 121 can be symmetrically distributed on opposite sides of the extension direction of the edge 210. This provides a clear positioning reference for the bending of the insulating film 100, so that the edge 210 can be accurately located at the midpoint of the transition segment 1131 formed by the insulating film body 110. This makes the force on both sides of the edge 210 of the insulating film body 110 more balanced, and makes the subsequent bending operation more accurate, improving production efficiency and product quality consistency.

[0059] Meanwhile, with the crease line 121 that abuts against the edge 210 as the center, the other crease lines 121 are symmetrically distributed, which can better adapt to the rounded corner 310 shape of the outer shell 300, further improving the compatibility between the insulating film 100 and the outer shell 300, thereby forming a tighter and stronger wrapping structure on both sides of the edge 210.

[0060] For example, when there are three crease lines 121 in the crease line group 120, two transition segments 1131 can be formed.

[0061] Furthermore, in specific implementation, the crease line 121 is a groove provided along the extension direction of the crease line 121.

[0062] It is understandable that providing a groove instead of a through hole to form a crease line 121 on the insulating film body 110 can prevent the two opposing surfaces of the insulating film body 110 from connecting at the crease line 121, effectively ensuring the insulation effect of the insulating film 100. Furthermore, the groove can be provided on the side of the insulating film body 110 facing the battery cell 200 to adapt to the bending direction of the insulating film body 110.

[0063] Furthermore, by adjusting the length of the groove along its own extension direction, a continuous long groove can be formed. And by adjusting the spacing between two adjacent grooves, different shapes of crease lines 121 can be formed, such as dotted lines, segmented dotted lines, or dashed lines; this application does not impose any limitations on these shapes. It should be noted that, to ensure that the insulating film body 110 can be smoothly bent along the crease line 121, the length of the groove along its own extension direction must be greater than or equal to the spacing between two adjacent grooves.

[0064] Furthermore, refer to Figure 1 As shown, four crease lines 120 are spaced apart along the width direction of the insulating film body 110. Furthermore, each crease line 121 extends along the length direction of the insulating film body 110.

[0065] With this configuration, the first edge 111 of the insulating film body 110 extends along the length direction of the insulating film body 110, and the second edge 112 of the insulating film body 110 extends along the width direction of the insulating film body 110, which is relatively regular. Furthermore, the crease line group 120 extends parallel to the first edge 111 and is spaced along the second edge 112, so that the insulating film body 110 has a clear directional guide during the bending process, which improves the bending accuracy and efficiency and reduces the possibility of damage to the insulating film 100 or non-adhesive wrapping caused by inaccurate bending direction.

[0066] Furthermore, the battery cell 200 is typically a regular cuboid structure, and its four peripheral surfaces can be pieced together along the edges 210 to form a rectangle. The crease line group 120 extends parallel to the first edge 111 to the second edge 112, which can better correspond to the edges 210 of the battery cell 200. This allows the insulating film 100 to fit more tightly against the outer periphery of the battery cell 200 when wrapping it, making it easier to determine the position of the crease line group 120 and the edge size of the insulating film body 110 according to the size of the battery cell 200, forming a regular and uniform rounded corner 310 structure, thereby better adapting to the rounded corners 310 of the outer casing 300.

[0067] Furthermore, in some embodiments, reference is made to Figure 1 As shown, each crease line 121 extends to both edges of the insulating film body 110 along the width direction.

[0068] The crease line group 120 is parallel to the first edge 111 and extends to the second edge 112 at both ends, so that the insulating film body 110 can be smoothly bent along the crease line 121 and wrap around the outer periphery of the battery cell 200, completely wrapping the battery cell 200 inside the insulating film 100, preventing external substances from contacting the battery cell 200, and enhancing the safety and stability of the battery cell 200.

[0069] Furthermore, during the production process of the insulating film 100, the width of the insulating film 100 strip can be set to be consistent with the size of the second edge 112, and the insulating film 100 strip can be conveyed along the direction of the first edge 111. During the conveying process, the crease line group 120 along the direction of the first edge 111 is continuously processed, and finally the insulating film 100 is cut according to the size of the first edge 111, thereby making the production and processing of the insulating film 100 faster and more efficient.

[0070] Furthermore, in some embodiments, reference is made to Figure 1 As shown, there is a first gap L between two adjacent crease line groups 120, and the first gap L is used to adapt to the length of the battery cell 200;

[0071] Alternatively, there may be a second gap D1 between two adjacent crease line groups 120, the second gap D1 being adapted to the width of the cell 200.

[0072] The four crease lines 120 correspond one-to-one with the four edges 210 of the battery cell 200, as shown in the reference. Figure 1 As shown from left to right, the center distance L between the first crease group 120 and the second crease group 120 is equal to the center distance L between the third crease group 120 and the fourth crease group 120, and corresponds to the dimension in the length direction of the cell 200; while the center distance D1 between the second crease group 120 and the third crease group 120 corresponds to the dimension in the width direction of the cell 200.

[0073] The spacing between adjacent crease line groups 120 corresponds to the width or length dimension of the battery cell 200, ensuring that after the insulating film 100 is bent along the crease line 121, the crease line group 120 precisely corresponds to each edge 210 and effectively wraps around the edge 210 of the battery cell 200. Because the relative positions of the crease line group 120 and the edge 210 are accurate, the insulating film 100, after wrapping the edge 210, forms a transition portion 113 with high consistency and a high degree of matching with the shape of the battery cell 200, ensuring a tight and secure fit between the insulating film 100 and the battery cell 200.

[0074] In addition, the two crease line groups 120 adjacent to the two edges in the length direction of the insulating film body 110 each have a third interval D2 between them and the corresponding edges in the length direction of the insulating film body 110, and the two third intervals D2 are equal.

[0075] When the insulating film 100 wraps the battery cell 200, the consistent third interval D2 makes the structure of the insulating film 100 on both sides of the first edge 111 more symmetrical, which helps to prevent the insulating film 100 from being damaged or deformed due to local stress concentration, and ensures that the insulating film 100 provides continuous and effective insulation protection for the battery cell 200.

[0076] During the production and processing of insulating film 100, consistent spacing facilitates the adoption of standardized production processes and equipment, reducing production difficulty and costs, and improving production efficiency.

[0077] Furthermore, in specific implementation, the length of the first edge 111 (i.e. the length of the insulating film body 110) is greater than or equal to the height of the battery cell 200;

[0078] The length of the second edge 112 (i.e. the width of the insulating film body 110) is greater than or equal to twice the sum of the length and width of the cell 200.

[0079] The first edge 111, with a dimension H greater than or equal to the height of the battery cell 200, ensures that the insulating film 100 completely covers the battery cell 200 in the height direction, providing comprehensive insulation protection for the battery cell 200. Furthermore, the second edge 112, with a dimension (2×L+2×D2+D1), is greater than or equal to twice the sum of the length and width of the battery cell 200. This allows the insulating film 100 to completely surround the battery cell 200 in both the length and width directions, thereby preventing safety hazards such as leakage caused by parts of the battery cell 200 not being covered by the insulating film 100 in the height, length, and width directions.

[0080] The sum of the distances D2 between the two crease line groups 120 near the first edge 111 can be greater than or equal to the center distance D1 between the two crease line groups 120 corresponding to the width of the cell 200, so that the size of the second edge 112 (2×L+2×D2+D1) is greater than or equal to twice the sum of the length and width of the cell 200.

[0081] This application embodiment also provides a battery cell, including a cell 200, a casing 300 and an insulating film 100 as described in any of the above embodiments. The insulating film 100 covers the outer periphery of the cell 200 and is disposed together with the cell 200 inside the casing 300.

[0082] The insulating film 100 has been described in the above embodiments and will not be repeated here.

[0083] The battery cell provided in this application embodiment has at least two crease line groups 120 formed on the insulating film body 110, each crease line group 120 including at least two crease lines 121. This allows the insulating film 100 to bend along the crease lines 121 when it is bent to wrap the battery cell 200, forming a transition portion 113 corresponding to the crease line group 120. Since each crease line group 120 includes at least two spaced crease lines 121, after the transition portion 113 is formed, at least two crease lines 121 are located on opposite sides of the edge 210 extending direction, thereby alleviating the sharp corners at the edge 210 in the transition portion 113.

[0084] Compared to simply setting a crease line 121 to form a sharp 90° bend at the edge 210, the transition portion 113 formed by the insulating film 100 in this application after bending along the crease line 121 has a lower sharpness and is closer to the rounded corner 310 structure of the outer casing 300. Therefore, when the battery cell 200 wrapped with the insulating film 100 is installed into the outer casing 300, the bent part of the insulating film 100 fits more closely with the rounded corner 310 structure of the outer casing 300, reducing the possibility of interference or slippage between the bent part of the insulating film 100 and the rounded corner 310 structure of the outer casing 300, and making it easier to install into the outer casing 300.

[0085] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0086] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0087] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0088] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An insulating film (100) for covering a battery cell (200) inside a housing (300), characterized in that, include: Insulating film body (110); Crease line groups (120), wherein at least two crease line groups (120) are provided at intervals on the insulating film body (110). Each of the crease line groups (120) includes at least two parallel and spaced crease lines (121). The insulating film body (110) is configured to be bent along the crease line (121) to form a transition portion (113) corresponding to the crease line group (120), the transition portion (113) being disposed between the edge (210) of the cell (200) and the rounded corner (310) of the outer casing (300).

2. The insulating film (100) according to claim 1, characterized in that, A transition segment (1131) is formed between two adjacent crease lines (121), the transition portion (113) includes at least two transition segments (1131), there is an angle between two adjacent transition segments (1131) and between the transition segment (1131) and the insulating film body (110), the angle being greater than 90° and less than 180°.

3. The insulating film (100) according to claim 2, characterized in that, Within the same crease line group (120), the spacing between two adjacent crease lines (121) is consistent.

4. The insulating film (100) according to claim 2, characterized in that, The number of transition segments (1131) is an even number.

5. The insulating film (100) according to claim 1, characterized in that, The crease line (121) is a groove provided along the extension direction of the crease line (121).

6. The insulating film (100) according to any one of claims 1-5, characterized in that, Four crease lines (120) are spaced apart along the width direction of the insulating film body (110).

7. The insulating film (100) according to claim 6, characterized in that, Each of the crease lines (121) extends along the length direction of the insulating film body (110).

8. The insulating film (100) according to claim 7, characterized in that, Each of the crease lines (121) extends to both edges of the insulating film body (110) along the width direction.

9. The insulating film (100) according to claim 6, characterized in that, There is a first gap between two adjacent crease line groups (120), the first gap being adapted to the length of the battery cell (200); Alternatively, there may be a second gap between two adjacent sets of crease lines (120), the second gap being adapted to the width of the battery cell (200); Furthermore, the two sets of crease lines (120) adjacent to the two edges of the insulating film body (110) in the length direction each have a third interval between them and the corresponding edges in the length direction of the insulating film body (110), and the two third intervals are equal.

10. A single battery cell, characterized in that, It includes a battery cell (200), a housing (300), and an insulating film (100) as described in any one of claims 1-9, wherein the insulating film (100) covers the outer periphery of the battery cell (200) and is disposed together with the battery cell (200) within the housing (300).

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