Insulating film, battery cell and electric equipment

Abstract

The utility model discloses an insulating film, a battery cell and electric equipment, and relates to the technical field of electric equipment. The insulating film comprises a first film, a second film, a third film, a fourth film and a fifth film, the second film is arranged on one side of the first film, the second film is connected with the first film, and the joint of the second film and the first film can be bent. The third diaphragm is arranged on the side, away from the second diaphragm, of the first diaphragm, the third diaphragm is connected with the first diaphragm, and the joint of the third diaphragm and the first diaphragm can be bent. The fourth diaphragm is arranged on the side, adjacent to the second diaphragm, of the first diaphragm, the fourth diaphragm is located between the second diaphragm and the third diaphragm, the fourth diaphragm is connected with the first diaphragm, the fifth diaphragm is arranged on the side, away from the fourth diaphragm, of the first diaphragm, the fifth diaphragm is located between the second diaphragm and the third diaphragm, and the fifth diaphragm is connected with the first diaphragm. The condition of aluminum leakage at the bottom of the battery cell can be avoided, and the insulation safety performance of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and in particular to an insulating film, a battery cell and electrical equipment. Background Art

[0002] Usually, the battery shell is made of metal, usually aluminum. In order to ensure the insulation between the battery cell and the battery shell and avoid short circuits and safety risks, the battery cell is usually wrapped with an insulating film before being placed in the battery shell to isolate the battery cell and the shell and avoid short circuits.

[0003] The current packaging method for battery cells is ring packaging, that is, the insulating film is wrapped around the side of the battery cell. This packaging method cannot completely cover the bottom and is prone to aluminum leakage, so there is a huge safety hazard. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide an insulating film, a battery cell and an electrical device, aiming to solve the technical problems in the prior art.

[0005] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] In a first aspect, an embodiment of the present application provides an insulating film, including:

[0007] First diaphragm;

[0008] A second diaphragm, the second diaphragm is arranged on one side of the first diaphragm, the second diaphragm is connected to the first diaphragm, and the connection between the second diaphragm and the first diaphragm is bendable;

[0009] A third diaphragm, the third diaphragm is arranged on a side of the first diaphragm away from the second diaphragm, the third diaphragm is connected to the first diaphragm, and the connection between the third diaphragm and the first diaphragm is bendable;

[0010] A fourth diaphragm, the fourth diaphragm is arranged on a side of the first diaphragm adjacent to the second diaphragm, the fourth diaphragm is located between the second diaphragm and the third diaphragm, the fourth diaphragm is connected to the first diaphragm, and the connection between the fourth diaphragm and the first diaphragm can be bent;

[0011] A fifth diaphragm, wherein the fifth diaphragm is arranged on a side of the first diaphragm away from the fourth diaphragm, the fifth diaphragm is located between the second diaphragm and the third diaphragm, the fifth diaphragm is connected to the first diaphragm, and the connection between the fifth diaphragm and the first diaphragm is bendable.

[0012] In one embodiment of the first aspect, a first connection section is formed at a connection between the second diaphragm and the first diaphragm, and the first connection section includes:

[0013] A first folding line, the first folding line is arranged on a side of the first film sheet close to the second film sheet;

[0014] a second folding line, the second folding line being arranged on a side of the first folding line close to the fourth membrane sheet;

[0015] A third folding line, wherein the third folding line is arranged on a side of the first folding line close to the fifth membrane, the third folding line is parallel to and opposite to the second folding line, and the distance between the second folding line and the third folding line is equal to the width of the battery cell to be coated.

[0016] In one embodiment of the first aspect, a second connecting section is formed between the third diaphragm and the first diaphragm, and the second connecting section includes:

[0017] a fourth folding line, the fourth folding line being arranged on a side of the first diaphragm close to the third diaphragm, and the distance between the first folding line and the fourth folding line being equal to the thickness of the battery cell;

[0018] a fifth folding line, the fifth folding line being arranged on a side of the fourth folding line close to the fourth membrane sheet, and the second folding line being arranged corresponding to the fifth folding line;

[0019] The sixth folding line is arranged on a side of the fourth folding line close to the fifth diaphragm, the sixth folding line is parallel to and opposite to the fifth folding line, the third folding line is arranged corresponding to the sixth folding line, and the distance between the fifth folding line and the sixth folding line is equal to the width of the battery cell.

[0020] In one embodiment of the first aspect, the insulating film further comprises:

[0021] A first cutting line, wherein the first cutting line is arranged between the fourth film sheet and the second film sheet, the first cutting line is used to separate the second film sheet from the fourth film sheet, and the distance between the first cutting line and the second folding line is set to a first distance c, which satisfies: 0.5 mm ≤ c ≤ 3 mm;

[0022] a second cutting line, the second cutting line is arranged between the fourth film sheet and the third film sheet, the second cutting line is used to separate the third film sheet and the fourth film sheet, and the distance between the first cutting line and the fifth folding line is set to a second distance c 1 , meet: 0.5mm≤c 1 ≤3mm;

[0023] A third cutting line is provided between the fifth film sheet and the second film sheet, the third cutting line is used to separate the second film sheet from the fifth film sheet, and the distance between the third cutting line and the third folding line is set to a third distance c 2 , meet: 0.5mm≤c 2 ≤3mm;

[0024] a fourth cutting line, the fourth cutting line being arranged between the fifth film sheet and the third film sheet, the fourth cutting line being used to separate the third film sheet from the fifth film sheet, and the distance between the fourth cutting line and the sixth folding line being set to a fourth distance c 3 , meet: 0.5mm≤c 3 ≤3mm.

[0025] In one embodiment of the first aspect, the first distance c and the second distance c 1 , the third distance c 2 and the fourth distance c 3 are equal in size, and the length of the first cutting line is b, the length of the second cutting line is b 1 , the length of the third cutting line is b 2 and the length of the fourth cutting line is b 3 , satisfying: b = b 1 =b 2 =b 3 .

[0026] In one embodiment of the first aspect, the distance between the first cutting line and the second cutting line is a, the thickness of the battery cell is T, and the following condition is satisfied: T / 4≤a≤T.

[0027] In one embodiment of the first aspect, the total width of the insulating film is B, the length of the first cutting line is b, and the width of the battery cell is W, satisfying: B=W+2×(b+c);

[0028] The total length of the insulating film is A, the thickness of the battery cell is T, the height of the battery cell is H, and the width of the extended area is e, satisfying: A=T+2H+e;

[0029] The width e of the extended region satisfies: e≥5 mm, and the insulating film of the portion of the extended region width e is used to be folded and wrapped on the top cover of the battery cell.

[0030] In a second aspect, an embodiment of the present application provides a battery cell, comprising the insulating film described in any of the above embodiments, wherein the battery cell has a rectangular parallelepiped structure, and the battery cell comprises a bottom surface and a top cover arranged opposite to each other, and a first side surface, a second side surface, a third side surface, and a fourth side surface arranged between the bottom surface and the top cover;

[0031] The first side surface is arranged opposite to the second side surface, the third side surface is arranged opposite to the fourth side surface, the area of ​​the first side surface is equal to the area of ​​the second side surface, the area of ​​the third side surface is equal to the area of ​​the fourth side surface, and the area of ​​the first side surface is greater than the area of ​​the third side surface.

[0032] In one embodiment of the second aspect, the first membrane is coated on the bottom surface;

[0033] The second film is coated on the first side surface, the area of ​​the second film close to the third side surface and protruding from the first side surface is correspondingly folded and coated on the third side surface, and the area of ​​the second film close to the fourth side surface and protruding from the first side surface is correspondingly folded and coated on the fourth side surface;

[0034] The third membrane is coated on the second side surface, the area of ​​the third membrane close to the third side surface and protruding from the second side surface is correspondingly folded and coated on the third side surface, and the area of ​​the third membrane close to the fourth side surface and protruding from the second side surface is correspondingly folded and coated on the fourth side surface;

[0035] The fourth diaphragm is coated on the third side and overlaps with a portion of the second diaphragm to form a first overlapping area, and overlaps with a portion of the third diaphragm to form a second overlapping area;

[0036] The fifth film is coated on the fourth side surface, and overlaps with a portion of the second film to form a third overlapping area, and overlaps with a portion of the third film to form a fourth overlapping area.

[0037] In a third aspect, an embodiment of the present application provides an electrical device, comprising the battery cell described in any of the above embodiments.

[0038] Compared with the prior art, the beneficial effects of the present application are as follows: the present application proposes an insulating film, a battery cell and an electrical device. The insulating film includes a first diaphragm, a second diaphragm, a third diaphragm, a fourth diaphragm and a fifth diaphragm. The second diaphragm is arranged on one side of the first diaphragm, the second diaphragm is connected to the first diaphragm, and the connection between the second diaphragm and the first diaphragm can be bent. The third diaphragm is arranged on one side of the first diaphragm away from the second diaphragm, the third diaphragm is connected to the first diaphragm, and the connection between the third diaphragm and the first diaphragm can be bent. The fourth diaphragm is arranged on one side of the first diaphragm adjacent to the second diaphragm, the fourth diaphragm is located between the second diaphragm and the third diaphragm, the fourth diaphragm is connected to the first diaphragm, and the connection between the fourth diaphragm and the first diaphragm can be bent. The fifth diaphragm is arranged on one side of the first diaphragm away from the fourth diaphragm, the fifth diaphragm is located between the second diaphragm and the third diaphragm, the fifth diaphragm is connected to the first diaphragm, and the connection between the fifth diaphragm and the first diaphragm can be bent. The present application arranges the second diaphragm, the third diaphragm, the fourth diaphragm and the fifth diaphragm along the circumference of the first diaphragm, and connects the second diaphragm, the third diaphragm, the fourth diaphragm and the fifth diaphragm to the first diaphragm, thereby fully covering the bottom and the arc edge of the bottom of the battery cell, thereby avoiding aluminum leakage from the bottom of the battery cell and improving the insulation safety performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of the unfolded structure of the insulating film in the present application is shown;

[0041] Figure 2 Another schematic diagram of the expanded structure of the insulating film in the present application is shown;

[0042] Figure 3 Another schematic diagram of the expanded structure of the insulating film in the present application is shown;

[0043] Figure 4 Another schematic diagram of the structure of the insulating film in the present application is shown;

[0044] Figure 5 A schematic diagram of the three-dimensional structure of an uncoated battery cell in the present application is shown;

[0045] Figure 6Another schematic diagram of the three-dimensional structure of an uncoated battery cell in the present application is shown;

[0046] Figure 7 Another schematic diagram of the three-dimensional structure of an uncoated battery cell in the present application is shown;

[0047] Figure 8 A schematic diagram of the three-dimensional structure of the battery cell in this application is shown;

[0048] Fig. 9 Another schematic diagram of the three-dimensional structure of the battery cell in the present application is shown;

[0049] Fig.10 Another three-dimensional structural schematic diagram of the battery cell in the present application is shown.

[0050] Description of main component symbols:

[0051] 100-insulating film; 110-first diaphragm; 120-second diaphragm; 121-first connecting section; 1211-first folding line; 1212-second folding line; 1213-third folding line; 130-third diaphragm; 131-second connecting section; 1311-fourth folding line; 1312-fifth folding line; 1313-sixth folding line; 140-fourth diaphragm; 141-first cutting line; 142-second cutting line; 150-fifth diaphragm; 151-third cutting line; 152-fourth cutting line; 200-battery cell; 201-first side surface; 202-second side surface; 203-third side surface; 204-fourth side surface; 205-top cover; 206-bottom surface; 210-first overlapping area; 220-second overlapping area; 230-third overlapping area; 240-fourth overlapping area. DETAILED DESCRIPTION

[0052] The embodiments of the present application 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 application, and cannot be understood as limiting the present application.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides an insulating film 100. The insulating film 100 includes a first diaphragm 110, a second diaphragm 120, a third diaphragm 130, a fourth diaphragm 140 and a fifth diaphragm 150.

[0058] Among them, the second diaphragm 120 is arranged on one side of the first diaphragm 110, the second diaphragm 120 is connected to the first diaphragm 110, and the connection between the second diaphragm 120 and the first diaphragm 110 can be bent, that is, in this embodiment, the second diaphragm 120 is folded through the connection, so that the second diaphragm 120 is covered on the side of the battery cell, and the first diaphragm 110 is covered on the bottom of the battery cell.

[0059] In addition, the third diaphragm 130 is disposed on a side of the first diaphragm 110 away from the second diaphragm 120 , and the third diaphragm 130 is connected to the first diaphragm 110 , and the connection between the third diaphragm 130 and the first diaphragm 110 is bendable.

[0060] Specifically, in this embodiment, the connection between the third film and the first film 110 is bent so that the third film 130 is folded and wrapped around a side surface of the battery cell opposite to the second film 120 .

[0061] The fourth diaphragm 140 is disposed on a side adjacent to the first diaphragm 110 and the second diaphragm 120, the fourth diaphragm 140 is located between the second diaphragm 120 and the third diaphragm 130, the fourth diaphragm 140 is connected to the first diaphragm 110, and the connection between the fourth diaphragm 140 and the first diaphragm 110 is bendable.

[0062] Specifically, in this embodiment, the connection between the fourth film and the first film 110 is bent so that the fourth film 140 is folded and coated on one side of the battery cell adjacent to the second film 120 .

[0063] In addition, the fifth diaphragm 150 is arranged on a side of the first diaphragm 110 away from the fourth diaphragm 140, the fifth diaphragm 150 is located between the second diaphragm 120 and the third diaphragm 130, the fifth diaphragm 150 is connected to the first diaphragm 110, and the connection between the fifth diaphragm 150 and the first diaphragm 110 can be bent.

[0064] Specifically, in this embodiment, the fifth membrane 150 is folded and wrapped around a side surface of the battery cell 200 opposite to the fourth membrane 140 by bending the connection between the fifth membrane and the first membrane 110 .

[0065] In the related art, the general packaging method of the battery cell is a ring-shaped packaging, in which the insulating film 100 is wrapped around the side of the battery cell. This packaging method cannot completely cover the bottom, which is prone to aluminum leakage and poses a great safety hazard.

[0066] In this embodiment, the insulating film 100 includes a first diaphragm 110, a second diaphragm 120, a third diaphragm 130, a fourth diaphragm 140 and a fifth diaphragm 150. In this embodiment, the second diaphragm 120, the third diaphragm 130, the fourth diaphragm 140 and the fifth diaphragm 150 are arranged along the circumference of the first diaphragm 110, and the second diaphragm 120, the third diaphragm 130, the fourth diaphragm 140 and the fifth diaphragm 150 are connected to the first diaphragm 110, thereby fully covering the bottom of the battery cell and the arc edge of the bottom, thereby avoiding aluminum leakage from the bottom of the battery cell and improving the insulation safety performance of the battery cell.

[0067] Alternatively, if Figure 1 , Figure 2 and Figure 3As shown, the connection between the second film sheet 120 and the first film sheet 110 forms a first connection section 121 , and the first connection section 121 includes a first folding line 1211 , a second folding line 1212 and a third folding line 1213 .

[0068] The first folding line 1211 is arranged on a side of the first diaphragm 110 close to the second diaphragm 120 , the second folding line 1212 is arranged on a side of the first folding line 1211 close to the fourth diaphragm 140 , and the third folding line 1213 is arranged on a side of the first folding line 1211 close to the fifth diaphragm 150 .

[0069] Specifically, the third folding line 1213 is parallel to and opposite to the second folding line 1212. Optionally, the distance between the second folding line 1212 and the third folding line 1213 is equal to the width of the battery cell to be coated.

[0070] Alternatively, if Figure 1 , Figure 2 and Figure 3 As shown, a second connecting section 131 is formed between the third film sheet 130 and the first film sheet 110 , and the second connecting section 131 includes a fourth folding line 1311 , a fifth folding line 1312 and a sixth folding line 1313 .

[0071] The fourth folding line 1311 is disposed on a side of the first diaphragm 110 close to the third diaphragm 130 , and the distance between the first folding line 1211 and the fourth folding line 1311 is equal to the thickness of the battery cell.

[0072] The fifth folding line 1312 is disposed on a side of the fourth folding line 1311 close to the fourth film sheet 140 , and the second folding line 1212 is disposed corresponding to the fifth folding line 1312 .

[0073] In addition, the sixth folding line 1313 is disposed on a side of the fourth folding line 1311 close to the fifth film sheet 150 , and the sixth folding line 1313 is parallel to and opposite to the fifth folding line 1312 .

[0074] The third folding line 1213 and the sixth folding line 1313 are arranged correspondingly, and the distance between the fifth folding line 1312 and the sixth folding line 1313 is equal to the width of the battery cell.

[0075] In this embodiment, the first folding line 1211, the second folding line 1212, the third folding line 1213, the fourth folding line 1311, the fifth folding line 1312 and the sixth folding line 1313 are aligned with the contour edge of the bottom of the battery cell, so that the first membrane 110 completely covers the bottom of the battery cell, thereby avoiding aluminum leakage from the bottom of the battery cell and further improving the insulation safety of the battery cell.

[0076] It should be noted that the first diaphragm 110 , the second diaphragm 120 , the third diaphragm 130 , the fourth diaphragm 140 and the fifth diaphragm 150 of the present embodiment are, for example, integrally formed.

[0077] Alternatively, if Figure 1 and Figure 3 As shown, the insulating film 100 further includes a first cutting line 141 , a second cutting line 142 , a third cutting line 151 and a fourth cutting line 152 .

[0078] The first cutting line 141 is disposed between the fourth film sheet 140 and the second film sheet 120. The first cutting line 141 of this embodiment is used to separate the second film sheet 120 from the fourth film sheet 140.

[0079] Specifically, cutting is performed along the first cutting line 141 to separate the second film sheet 120 from the fourth film sheet 140 .

[0080] Optionally, the distance between the first cutting line 141 and the second folding line 1212 is set to a first distance c, and the range of the first distance c is, for example, 0.5 mm to 3 mm.

[0081] Optionally, the first distance c is, for example, 0.5 mm, 1 mm or 3 mm.

[0082] In addition, the second cutting line 142 is disposed between the fourth film sheet 140 and the third film sheet 130. The second cutting line 142 of this embodiment is used to separate the third film sheet 130 from the fourth film sheet 140.

[0083] Specifically, the third film sheet 130 is cut from the fourth film sheet 140 along the second cutting line 142 .

[0084] Optionally, the distance between the first cutting line 141 and the fifth folding line 1312 is set to a second distance c 1 , and the second distance c 1 The range is 0.5mm~3mm.

[0085] Optionally, the second distance c 1 For example, 0.5 mm, 1 mm or 3 mm.

[0086] The third cutting line 151 is disposed between the fifth film sheet 150 and the second film sheet 120 . In this embodiment, the second film sheet 120 and the fifth film sheet 150 are separated by the third cutting line 151 .

[0087] Specifically, cutting is performed along the third cutting line 151 to separate the second film sheet 120 from the fifth film sheet 150 .

[0088] Optionally, the distance between the third cutting line 151 and the third folding line 1213 is set to a third distance c 2 , wherein the third distance c 2 The range is 0.5mm~3mm.

[0089] Optionally, the third distance c 2 For example, 0.5 mm, 1 mm or 3 mm.

[0090] Optionally, the fourth cutting line 152 is disposed between the fifth film sheet 150 and the third film sheet 130, the fourth cutting line 152 is used to separate the third film sheet 130 from the fifth film sheet 150, and the distance between the fourth cutting line 152 and the sixth folding line 1313 is set to a fourth distance c 3 , the fourth distance c 3 The range is 0.5mm~3mm.

[0091] Optionally, the fourth distance c 3 For example, 0.5 mm, 1 mm or 3 mm.

[0092] It should be noted that if Figure 1 , Figure 3 and Figure 4 As shown, the first distance c and the second distance c 1 , the third distance c 2 and the fourth distance c 3 are equal in size, and the first cutting line 141, the second cutting line 142, the third cutting line 151 and the fourth cutting line 152 are equal in length.

[0093] It should be noted that the distance between the first cutting line 141 and the second cutting line 142 is equal to the distance between the third cutting line 151 and the fourth cutting line 152 .

[0094] Optionally, the distance between the first cutting line 141 and the second cutting line 142 is less than the thickness of the battery cell and greater than one quarter of the thickness of the battery cell, and the distance between the third cutting line 151 and the fourth cutting line 152 is less than the thickness of the battery cell and greater than one quarter of the thickness of the battery cell.

[0095] Optionally, the distance between the first cutting line 141 and the second cutting line 142 is, for example, a, and the thickness of the battery cell is T, then a satisfies T / 4≤a≤T.

[0096] Optionally, in this embodiment, the distance between the first cutting line 141 and the second folding line 1212 is set to a first width, and the total width of the insulating film 100 is equal to twice the sum of the length of the first cutting line 141 and the first width and the sum of the battery cell width.

[0097] Specifically, if Figure 1 , Figure 3 and Figure 4 As shown, the total width of the insulating film 100 is, for example, B=W+2×(b+c), where B is the total width of the insulating film 100, W is the width of the battery cell, b is the length of the first cutting line 141, and c is the first width, that is, the distance between the first cutting line 141 and the second folding line 1212. The range of c is 0.5 mm ≤ c ≤ 3 mm, and optionally, c is, for example, 0.5 mm, 1 mm, or 3 mm.

[0098] In addition, the total length of the insulating film 100 is equal to the sum of the thickness of the battery cell, twice the height of the battery cell, and the width of the extension region.

[0099] Among them, the width of the extended area is greater than or equal to 5 mm, and in this embodiment, the insulating film 100 of the extended area is folded and covered on the top cover of the battery cell, so that the insulating film 100 is stably wrapped on the battery cell and is not easy to fall off, thereby improving the insulation safety of the battery cell.

[0100] Specifically, the total length of the insulating film 100 is calculated by, for example, A=T+2H+e, where A is the total length of the insulating film 100, T is the thickness of the battery cell, H is the height of the battery cell, and e is the width of the extended region. The range of e is e≥5 mm. Optionally, e is, for example, 5 mm.

[0101] It should be noted that the present embodiment does not limit the width of the extension area, and the width of the extension area can be designed according to actual production conditions.

[0102] like Figure 8 , Fig. 9 and Fig.10As shown, this embodiment provides a battery cell 200 having the insulating film 100 described in any of the above embodiments, and thus having all the beneficial effects of the insulating film 100, which will not be described in detail here.

[0103] Specifically, if Figure 5 , Figure 6 and Figure 7 As shown, the battery cell 200 of this embodiment has a rectangular structure, and the battery cell 200 includes a bottom surface 206 and a top cover 205 that are arranged opposite to each other, and a first side surface 201, a second side surface 202, a third side surface 203 and a fourth side surface 204 that are arranged between the bottom surface 206 and the top cover 205.

[0104] Among them, the first side surface 201 is arranged opposite to the second side surface 202, the third side surface 203 is arranged opposite to the fourth side surface 204, and the area of ​​the first side surface 201 is equal to the area of ​​the second side surface 202, the area of ​​the third side surface 203 is equal to the area of ​​the fourth side surface 204, and the area of ​​the first side surface 201 is greater than the area of ​​the third side surface 203.

[0105] Alternatively, if Figure 8 , Fig. 9 and Fig.10 As shown, the first membrane 110 is coated on the bottom surface 206, and the edge of the bottom surface 206 is arranged corresponding to the first connecting section 121 and the second connecting section 131. That is, in this embodiment, the first folding line 1211, the second folding line 1212, the third folding line 1213, the fourth folding line 1311, the fifth folding line 1312 and the sixth folding line 1313 are fitted with the edge contour of the bottom surface 206 of the battery cell 200, so that the first membrane 110 completely covers the bottom surface 206 of the battery cell 200 and its edge arc, thereby avoiding aluminum leakage from the bottom of the battery cell 200 and further improving the insulation safety performance of the battery cell 200.

[0106] In addition, the second membrane sheet 120 is wrapped around the first side surface 201 , and the area of ​​the second membrane sheet 120 close to the third side surface 203 and protruding from the first side surface 201 is correspondingly folded and wrapped around the third side surface 203 , and the area of ​​the second membrane sheet 120 close to the fourth side surface 204 and protruding from the first side surface 201 is correspondingly folded and wrapped around the fourth side surface 204 .

[0107] In addition, the third membrane 130 is wrapped around the second side 202, and the area of ​​the third membrane 130 close to the third side 203 and protruding from the second side 202 is correspondingly folded and wrapped around the third side 203, and the area of ​​the third membrane 130 close to the fourth side 204 and protruding from the second side 202 is correspondingly folded and wrapped around the fourth side 204.

[0108] In the related art, the U-shaped package is a packaging method for the battery cell 200. Compared with the ring-shaped package, the insulation safety of the U-shaped package is improved, but the number of overlapping layers in the width direction of the battery cell 200 is five, which makes the width of the battery cell 200 larger and affects the assembly of the module.

[0109] In this embodiment, if Figure 8 As shown, the fourth film 140 is wrapped around the third side 203 , and overlaps with the portion of the second film 120 folded on the third side 203 to form a first overlapping area 210 , and overlaps with the portion of the third film 130 folded on the third side 203 to form a second overlapping area 220 .

[0110] It should be noted that the first overlapping area 210 and the second overlapping area 220 both have three overlapping layers, wherein the three layers of the first overlapping area 210 are two layers formed by folding the second film 120 on the third side 203 and a fourth film 140 overlapping the second film 120.

[0111] In addition, the three layers of the second overlapping area 220 are respectively two layers formed by folding the third film 130 on the third side surface 203, and a fourth film 140 overlapped on the third film 130. Therefore, the influence of the film on the width of the battery cell 200 is reduced, the assembly effect and capacity of the battery cell 200 are improved, and the assembly performance of the module is improved.

[0112] Among them, Fig. 9 As shown, the fifth film 150 is coated on the fourth side surface 204 , and overlaps with a portion of the second film 120 to form a third overlapping area 230 , and overlaps with a portion of the third film 130 to form a fourth overlapping area 240 .

[0113] It should be noted that the third overlapping area 230 and the fourth overlapping area 240 both have three overlapping layers, wherein the three layers of the third overlapping area 230 are respectively two layers formed by folding the second membrane 120 on the fourth side 204 and a fifth membrane 150 overlapped on the second membrane 120.

[0114] In addition, the three layers of the fourth overlapping area 240 are respectively two layers formed by folding the third membrane 130 on the fourth side 204, and a layer of fifth membrane 150 overlapping the third membrane 130, which further reduces the influence of the membrane on the width of the battery cell 200, improves the assembly effect and capacity of the battery cell 200, and improves the assembly of the module.

[0115] This embodiment provides an electrical device having the battery cell 200 described in any of the above embodiments, and thus having all the beneficial effects of the battery cell 200, which will not be described in detail here.

[0116] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 schematic representations 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0117] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An insulating film, characterized in that: include: First diaphragm; A second diaphragm, the second diaphragm is arranged on one side of the first diaphragm, the second diaphragm is connected to the first diaphragm, and the connection between the second diaphragm and the first diaphragm is bendable; A third diaphragm, the third diaphragm is arranged on a side of the first diaphragm away from the second diaphragm, the third diaphragm is connected to the first diaphragm, and the connection between the third diaphragm and the first diaphragm is bendable; A fourth diaphragm, the fourth diaphragm is arranged on a side of the first diaphragm adjacent to the second diaphragm, the fourth diaphragm is located between the second diaphragm and the third diaphragm, the fourth diaphragm is connected to the first diaphragm, and the connection between the fourth diaphragm and the first diaphragm can be bent; A fifth diaphragm, wherein the fifth diaphragm is arranged on a side of the first diaphragm away from the fourth diaphragm, the fifth diaphragm is located between the second diaphragm and the third diaphragm, the fifth diaphragm is connected to the first diaphragm, and the connection between the fifth diaphragm and the first diaphragm is bendable.

2. The insulating film according to claim 1, wherein The connection between the second diaphragm and the first diaphragm forms a first connection section, and the first connection section includes: A first folding line, the first folding line is arranged on a side of the first film sheet close to the second film sheet; a second folding line, the second folding line being arranged on a side of the first folding line close to the fourth membrane sheet; A third folding line, wherein the third folding line is arranged on a side of the first folding line close to the fifth membrane, the third folding line is parallel to and opposite to the second folding line, and the distance between the second folding line and the third folding line is equal to the width of the battery cell to be coated.

3. The insulating film according to claim 2, characterized in that A second connecting section is formed between the third diaphragm and the first diaphragm, and the second connecting section includes: a fourth folding line, the fourth folding line being arranged on a side of the first diaphragm close to the third diaphragm, and the distance between the first folding line and the fourth folding line being equal to the thickness of the battery cell; a fifth folding line, the fifth folding line being arranged on a side of the fourth folding line close to the fourth membrane sheet, and the second folding line being arranged corresponding to the fifth folding line; The sixth folding line is arranged on a side of the fourth folding line close to the fifth diaphragm, the sixth folding line is parallel to and opposite to the fifth folding line, the third folding line is arranged corresponding to the sixth folding line, and the distance between the fifth folding line and the sixth folding line is equal to the width of the battery cell.

4. The insulating film according to claim 3, characterized in that The insulating film further comprises: A first cutting line, wherein the first cutting line is arranged between the fourth film sheet and the second film sheet, the first cutting line is used to separate the second film sheet from the fourth film sheet, and the distance between the first cutting line and the second folding line is set to a first distance c, which satisfies: 0.5 mm ≤ c ≤ 3 mm; A second cutting line, the second cutting line is arranged between the fourth film sheet and the third film sheet, the second cutting line is used to separate the third film sheet from the fourth film sheet, and the distance between the first cutting line and the fifth folding line is set to a second distance c1, satisfying: 0.5 mm ≤ c1 ≤ 3 mm; A third cutting line, the third cutting line is arranged between the fifth film sheet and the second film sheet, the third cutting line is used to separate the second film sheet from the fifth film sheet, and the distance between the third cutting line and the third folding line is set to a third distance c2, satisfying: 0.5 mm ≤ c2 ≤ 3 mm; A fourth cutting line, wherein the fourth cutting line is arranged between the fifth film sheet and the third film sheet, the fourth cutting line is used to separate the third film sheet from the fifth film sheet, and the distance between the fourth cutting line and the sixth folding line is set to a fourth distance c3, satisfying: 0.5mm≤c3≤3mm.

5. The insulating film according to claim 4, characterized in that The first distance c, the second distance c1, the third distance c2 and the fourth distance c3 are equal in size, and the length of the first cutting line is b, the length of the second cutting line is b1, the length of the third cutting line is b2 and the length of the fourth cutting line is b3, satisfying: b=b1=b2=b3.

6. The insulating film according to claim 4, characterized in that The distance between the first cutting line and the second cutting line is a, the thickness of the battery cell is T, and the following relationship is satisfied: T / 4≤a≤T.

7. The insulating film according to claim 4, characterized in that The total width of the insulating film is B, the length of the first cutting line is b, and the width of the battery cell is W, satisfying: B=W+2×(b+c); The total length of the insulating film is A, the thickness of the battery cell is T, the height of the battery cell is H, and the width of the extended area is e, satisfying: A=T+2H+e; The width e of the extended region satisfies: e≥5 mm, and the insulating film of the portion of the extended region width e is used to be folded and wrapped on the top cover of the battery cell.

8. A battery cell comprising the insulating film according to any one of claims 1 to 7, characterized in that: The battery cell has a rectangular parallelepiped structure, and the battery cell includes a bottom surface and a top cover which are arranged opposite to each other, and a first side surface, a second side surface, a third side surface and a fourth side surface which are arranged between the bottom surface and the top cover; The first side surface is arranged opposite to the second side surface, the third side surface is arranged opposite to the fourth side surface, the area of ​​the first side surface is equal to the area of ​​the second side surface, the area of ​​the third side surface is equal to the area of ​​the fourth side surface, and the area of ​​the first side surface is greater than the area of ​​the third side surface.

9. The battery cell according to claim 8, characterized in that: The first membrane is coated on the bottom surface; The second film is coated on the first side surface, the area of ​​the second film close to the third side surface and protruding from the first side surface is correspondingly folded and coated on the third side surface, and the area of ​​the second film close to the fourth side surface and protruding from the first side surface is correspondingly folded and coated on the fourth side surface; The third membrane is coated on the second side surface, the area of ​​the third membrane close to the third side surface and protruding from the second side surface is correspondingly folded and coated on the third side surface, and the area of ​​the third membrane close to the fourth side surface and protruding from the second side surface is correspondingly folded and coated on the fourth side surface; The fourth diaphragm is coated on the third side and overlaps with a portion of the second diaphragm to form a first overlapping area, and overlaps with a portion of the third diaphragm to form a second overlapping area; The fifth film is coated on the fourth side surface, and overlaps with a portion of the second film to form a third overlapping area, and overlaps with a portion of the third film to form a fourth overlapping area.

10. An electrical device, characterized in that: The invention comprises the battery cell as claimed in claim 9.

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