Battery insulating film

Abstract

According to the structure of a square battery to be wrapped, the battery insulating film is sequentially divided into a battery cell first large surface film, a first windowed film, a battery cell second large surface film, a second windowed film and a battery cell third large surface film from one end to the other end, the first battery cell large surface film, the second battery cell large surface film and the third battery cell large surface film are used for carrying out coating protection on two large surfaces of the square battery cell, the first windowing film correspondingly coats the top surface of the square battery cell, and the second windowing film correspondingly coats the bottom surface of the square battery cell. According to the utility model, the risk of opening and warping caused by excessive folded edges and folded angles due to the battery pack insulating film can be reduced; the insulating film is provided with the large surface film, the large surface side film and the small surface side film, so that the battery can be effectively protected, and the effects of insulation, surface scratch prevention and the like are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery insulation film technical field, especially a kind of battery insulation film. BACKGROUND

[0002] Square power battery can provide energy source for new energy electric vehicle, energy storage cabinet etc.. Square power battery is generally composed of battery pole group, battery cover, battery shell etc., after battery assembly is completed, a layer of insulation film is usually coated on battery large face, side surface, then outer gasket is pasted on battery top, thereby play the role of insulation and prevent battery surface scratch etc.. Current battery insulation film is divided into windowed film and non-windowed film, insulation film is coated by U-shaped film wrapping or back-shaped film wrapping method. But current insulation film has the following shortcomings: film wrapping needs to paste outer gasket on top, increase cost, reduce efficiency. There are cocking and opening defects in insulation film folding edge area, affect the insulation and safety of battery. In the film wrapping process of non-windowed film, film wrapping will generate more folding edge and corner, more folding edge will introduce opening risk of insulation film and battery shell bonding place, there will be battery short circuit risk etc.;Corner will lead to cocking, affect the lamination effect of outer gasket and bottom film. In addition, windowed insulation film is usually windowed in the area attached with battery cover, replace outer gasket, but there will be folding edge and corner when wrapping at the bottom of electric core, which will bring safety hazard. Moreover, the side edge of existing insulation film has no opening, which will lead to too large corner area when wrapping, easily cause the risk of water vapor immersion into battery after battery condensation. SUMMARY

[0003] The utility model aims at overcoming the insufficient and defects of prior art, and provides a battery insulation film with novel structure.

[0004] A kind of battery insulation film, according to the structure of square battery to be wrapped, it is sequentially divided into electric core first large face film, first windowed film, electric core second large face film, second windowed film, electric core third large face film from one end to another end;The electric core first large face film, electric core second large face film, electric core third large face film are used to wrap and protect two large faces of square electric core, the first windowed film is wrapped on the top surface of square electric core, and the second windowed film is wrapped on the bottom surface of square electric core.

[0005] Wherein, the contact area of the electric core first large face film and the electric core first large face is less than the area of the pasted electric core first large face, the contact area of the electric core third large face film and the electric core first large face is less than the area of the pasted electric core first large face, the contact area of the third large face film and the electric core second large face is equal to the area of the pasted electric core second large face, the first large face film and the third large face film are partially overlapped and attached to the electric core first large face, and the second large face film is attached to the electric core second large face.

[0006] The first large surface film of the battery cell comprises a first side film and a second side film which are not attached to the large surface of the battery.

[0007] The first windowing film has positive pole column openings, negative pole column openings, explosion-proof valve openings and two-dimensional code openings, and the openings are located at positions corresponding to the positive and negative pole columns, the explosion-proof valve and the two-dimensional code marking area of the battery, and the size of the openings completely covers the size of the positive and negative pole columns, the explosion-proof valve and the two-dimensional code marking area of the battery.

[0008] The first windowing film comprises a first side film and a second side film which are not attached to the top surface of the battery.

[0009] The second large surface film of the battery cell comprises a third side film and a fourth side film which are not attached to the second large surface of the battery cell.

[0010] The second windowing film has a rectangular opening, and when the second windowing film is attached to the bottom of the battery cell, the rectangular opening of the second windowing film can expose part of the bottom of the battery shell.

[0011] The third large surface film of the battery cell comprises a fifth side film and a sixth side film which are not attached to the first large surface of the battery cell.

[0012] The first windowing film is connected to the first large surface film, and the second windowing film is connected to the second large surface film.

[0013] The first square opening and the second square opening are arranged at the connection position of the first windowing film and the first large surface film.

[0014] The battery insulation film can reduce the risk of opening and warping caused by too many folded edges and corners of the battery pack insulation film.

[0015] The accompanying drawings;

[0016] Figure 1 The battery insulation film provided by the utility model provides a battery insulation film overall structure schematic view.

[0017] Figure 2The utility model provides a battery insulating film big face first, second side film schematic drawing.

[0018] Figure 3 The utility model provides a battery insulating film small face first, second side film schematic drawing.

[0019] Figure 4 The utility model provides a battery insulating film big face third, fourth side film schematic drawing.

[0020] Figure 5 The utility model provides a battery insulating film small face third, fourth side film schematic drawing.

[0021] Figure 6 The utility model provides a battery insulating film big face fifth, sixth side film and coincident area schematic drawing.

[0022] Figure 7 The utility model provides a battery insulating film angle -bent area schematic drawing.

[0023] Figure 8 For Figure 7 The local enlarged view of

[0024] Figure 9 The utility model provides a battery insulating film side coincident area schematic drawing. Specific implementation

[0025] The utility model will be further explained in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and do not limit the utility model.

[0026] Referring to Figure 1 The utility model discloses an insulating film for square battery, and the insulating film is divided into a first large face film of battery core, a first window film, a second large face film of battery core, a second window film and a third large face film of battery core from one end to the other end according to the structure of the square battery to be wrapped.

[0027] In the embodiment of the application, the first and second window films can replace the function of the outer gasket, the insulating film and the outer gasket are integrated, material is saved, the film wrapping efficiency is improved, the edge folding area is reduced, the risk of warping and opening is reduced, the first window film is attached to the top surface of the battery and can expose the positive and negative poles, the explosion-proof valve and the two-dimensional code area, and the second window film is attached to the bottom surface of the battery and can expose part of the bottom of the battery shell.

[0028] In some embodiments of this application, the contact area between the first large surface film 1 of the battery cell and the first large surface of the battery cell is smaller than the area of ​​the first large surface of the battery cell to which it is attached; the contact area between the third large surface film 5 of the battery cell and the first large surface of the battery cell is smaller than the area of ​​the first large surface of the battery cell to which it is attached; the contact area between the third large surface film 5 and the second large surface of the battery cell is equal to the area of ​​the second large surface of the battery cell to which it is attached; the first large surface film 1 and the third large surface film 5 are partially overlapped and attached to the first large surface of the battery cell; and the second large surface film 4 is attached to the second large surface of the battery cell.

[0029] In some embodiments of this application, reference is made to Figure 2 As shown, the first large surface film 1 of the battery cell includes a first side film 11 and a second side film 12 that are not attached to the large surface of the battery. They are located at both ends of the first large surface film of the battery cell and are used to attach to two opposite sides of the battery cell. When the first large surface film 1 of the battery cell is attached from the center line of the first large surface of the battery cell toward the top surface of the battery cell, the first side film 11 and the second side film 12 are not attached to the large surface of the battery cell.

[0030] In some embodiments of this application, the length dimension l1 of the first large surface film 1 of the battery cell and the shoulder height dimension H1 of the battery cell satisfy the following relationship: l1 = H1 * 0.5; the width dimension w1 and the length dimension L1 of the battery cell satisfy the following relationship: w1 = L1. The width dimension w2 of the first side film 11 and the first side film 12 of the large surface film and the width dimension W1 of the battery cell should satisfy the following relationship: w2 = (0.6 ~ 0.8) * W1.

[0031] In some embodiments of this application, the first window film 2 includes multiple openings for exposing the terminals, explosion-proof valve, and QR code on the top of the battery cell. Specifically, the first window film 2 has a positive terminal opening 201, a negative terminal opening 202, an explosion-proof valve opening 203, and a QR code opening 204, which are aligned with the relative positions of the positive and negative terminals, explosion-proof valve, and QR code marking areas of the battery. The size of the opening can completely cover the area of ​​the positive and negative terminals, explosion-proof valve, and QR code marking areas of the battery.

[0032] refer to Figure 3 As shown, in some embodiments of this application, the first window film 2 includes a small first side film 21 and a small second side film 22 that are not attached to the top surface of the battery, located at both ends of the first window film 2.

[0033] In some embodiments of this application, the length dimension l2 of the first window film 2 and the width dimension W1 of the cell satisfy the following relationship: l2 = W1; the width dimension w3 of the first side film 21 and the second side film 22 of the small face and the shoulder height dimension H1 of the battery satisfy the following relationship: w3 = (0.1~0.3) * H1.

[0034] refer to Figure 4As shown, in some embodiments of the present application, the second large surface film 3 of the battery cell includes a third large surface side film 31 and a fourth large surface side film 32 which are not attached to the second large surface of the battery cell. When the second large surface film 3 of the battery cell is attached to the bottom surface of the battery cell along the second large surface of the battery cell, the third large surface side film 31 and the fourth large surface side film 32 are not attached to the second large surface of the battery cell.

[0035] In some embodiments of the present application, the length l3 of the second large surface film 3 of the battery cell satisfies the following relationship with the shoulder height H1 of the battery cell: l3 = H1, and the second large surface film has the same width as the first large surface film of the battery cell. The third large surface side film 31 and the fourth large surface side film 32 have the same width w4 as the first large surface side film and the second large surface side film.

[0036] Referring to Figure 1 , Figure 5 In some embodiments of the present application, the second window film 4 has a large rectangular opening 401. When the second window film 4 is attached to the bottom of the battery cell, the rectangular opening 401 of the second window film is attached to the bottom of the battery cell and can leak out part of the bottom of the battery shell.

[0037] In some embodiments of the present application, the second window film 4 has a part which is not attached to the bottom of the battery cell, including a third small surface side film 41 and a fourth small surface side film 42. The third small surface side film 41 and the fourth small surface side film 42 are arranged at opposite ends of the second window film 4.

[0038] In some embodiments of the present application, the rectangular opening 401 has a length and a width which are 3-5 mm smaller than the length and the width of the bottom of the battery cell, and the rectangular opening is arranged symmetrically with respect to the length and the width of the bottom of the battery cell.

[0039] Referring to Figure 1 , Figure 6 As shown, in some embodiments of the present application, the third large surface film 5 of the battery cell includes a fifth large surface side film 51 and a sixth large surface side film 52 which are not attached to the first large surface of the battery cell. The third large surface film 5 is attached to the center line of the first large surface of the battery cell from the bottom of the battery cell, and overlaps the first large surface film 1 of the battery cell to form an overlapping area 015.

[0040] In some embodiments of the present application, the length l4 of the third large surface film 5 of the battery cell satisfies the following relationship with the shoulder height H1 of the battery cell: l4 = 0.65 * H1. After the third large surface film 5 is completely attached to the first large surface of the battery cell, the third large surface film 5 overlaps the first large surface film 1 of the battery cell to form an overlapping area 015.

[0041] In some embodiments of the present application, the third large surface film 5 of the battery cell has the same width as the first large surface film 1 of the battery cell. The fifth large surface side film and the sixth large surface side film have the same width w5 as the first large surface side film and the second large surface side film.

[0042] Referring to Figure 1 、 Figure 7 As shown in the drawings, in some embodiments of the present application, the first large surface film 1 of the battery cell is provided with a first square opening 121 and a second square opening 122 at the connection with the first window film 2. Similarly, the second large surface film 3 of the battery cell is provided with a third square opening 323, a fourth square opening 324, a fifth square opening 345, and a sixth square opening 346 at the corresponding positions of the first window film 2 and the second window film 4. The third large surface film 5 of the battery cell is provided with a seventh square opening 547 and an eighth square opening 548 at the corresponding positions of the second window film 4.

[0043] Eight square openings are respectively arranged on both sides of the insulation film. The square openings can effectively reduce the size of the overlapping triangular area of the battery side insulation film, reduce the size of the fold angle of the overlapping area of the film, and reduce the risk of warping and the risk of water vapor entering the battery after condensation.

[0044] In some embodiments of the present application, the sizes of the first square opening to the eighth square opening are consistent, and the square opening size l5 and the battery width size W1 satisfy the following relationship: l5 = 0.2W1.

[0045] Specifically, in the embodiment of the present application, when the entire insulation film is attached, the first large surface film 1 of the battery cell is attached from the center line of the first large surface of the battery cell to the top surface of the battery cell, and then the first window film 2 is attached to the top cover of the battery cell through the positive pole opening 201 and the negative pole opening 200. The battery pole passes through the pole opening to attach the insulation film to the top surface of the battery, and the explosion-proof valve and the two-dimensional code are exposed through the explosion-proof valve opening 203 and the two-dimensional code opening 204. Then the second large surface film 3 of the battery cell is attached to the second large surface of the battery cell, and then the second window film is attached to the bottom surface of the battery cell. Finally, the third large surface film 5 of the battery cell is attached to the second large surface of the battery cell, overlapping the first large surface film 1 of the battery cell.

[0046] During the processing of the side film, the first large surface side film 11 and the second large surface side film 12, the fifth large surface side film 51 and the sixth large surface side film 52 can be attached to the first side surface and the second side surface of the battery cell. After attachment, the third large surface side film 31 and the fourth large surface side film 32 are attached to the two side surfaces of the battery cell to form overlapping areas 00 on both sides. Finally, the first small surface side film 21, the second small surface side film 22, the third small surface side film 43, and the fourth small surface side film 44 of the insulation film are attached to the first side surface and the second side surface of the battery cell.

[0047] In some embodiments of the present application, as Figure 8As shown, when the side film is attached, the first side film 21 of the facet is folded to form triangular area one 001 and triangular area two 002 with the first square opening 121 and the third square opening 323; wherein the second side film 22 of the facet is folded to form triangular area three 007 and triangular area four 008 with the second square opening 122 and the fourth square opening 324; wherein the second side film 22 of the facet is folded to form triangular area five 003 and triangular area six 004 with the fifth square opening 345 and the seventh square opening 547; wherein the second side film 22 of the facet is folded to form triangular area seven 005 and triangular area eight 006 with the sixth square opening 346 and the eighth square opening 548.

[0048] The basic principle and main features of the present application and the advantages of the present application are shown and described above, for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or basic characteristics of the present application;

[0049] Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0050] In addition, it should be understood that although the present application is described in the specification, each embodiment only contains one independent technical solution, and the description manner of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A battery insulating film, characterized in that, According to the structure of the square battery to be wrapped, it is divided into the first large surface film, the first window film, the second large surface film, the second window film, and the third large surface film of the battery cell from one end to the other. The first large surface film, the second large surface film, and the third large surface film of the battery cell are used to cover and protect the two large surfaces of the square battery cell. The first window film covers the top surface of the square battery cell, and the second window film covers the bottom surface of the square battery cell.

2. The battery insulating film according to claim 1, characterized in that, The contact area between the first large surface film of the battery cell and the first large surface of the battery cell is smaller than the area of ​​the first large surface of the battery cell to which it is attached. The contact area between the third large surface film of the battery cell and the first large surface of the battery cell is smaller than the area of ​​the first large surface of the battery cell to which it is attached. The contact area between the third large surface film and the second large surface of the battery cell is equal to the area of ​​the second large surface of the battery cell to which it is attached. The first large surface film and the third large surface film are partially overlapped and attached to the first large surface of the battery cell. The second large surface film is attached to the second large surface of the battery cell.

3. The battery insulating film according to claim 1, characterized in that, The first large-area film of the battery cell includes a first side film and a second side film that are not attached to the large surface of the battery, and are used to be attached to two opposite sides of the battery cell.

4. The battery insulating film according to claim 1, characterized in that, The first window film has openings for the positive and negative terminals, the explosion-proof valve, and the QR code. The relative positions of these openings are consistent with the corresponding positive and negative terminals, the explosion-proof valve, and the QR code marking area of ​​the battery. The size of the window completely covers the area of ​​the battery's positive and negative terminals, the explosion-proof valve, and the QR code marking area. After the first window film is attached to the top surface of the battery, the battery's positive and negative terminals, the explosion-proof valve, and the QR code marking area are exposed.

5. The battery insulating film according to claim 1, characterized in that, The first window film includes a small first side film and a small second side film that are not attached to the top surface of the battery.

6. The battery insulating film according to claim 1, characterized in that, The second large surface film of the battery cell includes a third side film and a fourth side film of the large surface that are not attached to the second large surface of the battery cell.

7. The battery insulating film according to claim 1, characterized in that, The second window film has a rectangular opening. When the second window film is attached to the bottom of the battery cell, a portion of the bottom of the battery casing can be exposed after the rectangular opening of the second window film is attached to the bottom of the battery.

8. The battery insulating film according to claim 1, characterized in that, The third large surface film 5 of the battery cell includes a fifth side film and a sixth side film that are not attached to the first large surface of the battery cell.

9. The battery insulating film according to claim 1, characterized in that, The first large face film of the battery cell is provided with a first square opening and a second square opening at the connection between it and the first window film; the second large face film of the battery cell is provided with a third square opening, a fourth square opening, a fifth square opening and a sixth square opening at the corresponding positions of it and the first and second window films; the third large face film of the battery cell is provided with a seventh square opening and an eighth square opening at the corresponding positions of it and the second window film.

10. The battery insulating film according to claim 9, characterized in that, The width of the first to eighth square openings is the same.

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