Insulating film assembly for battery and battery having same

Abstract

The battery is provided with a shell, the shell comprises a shell body and a top cover, at least one of the two opposite ends of the shell body is provided with an opening, the top cover covers the opening of the shell body, and the insulating film assembly comprises a first insulating film, a second insulating film and a third insulating film, the first insulating film comprises a body part and a turnover part, the body part is attached to the side, away from the shell body, of the top cover, the turnover part is connected to the peripheral wall of the body part, and the turnover part is used for being turned over towards the shell body and attached to the outer wall face of the shell body. According to the insulating film assembly for the battery, the bonding reliability and the positioning accuracy of the first insulating film and the shell can be guaranteed, the problem of warping of the first insulating film is avoided, the problem of secondary re-bonding after production is avoided, the production efficiency is improved, the stability and the reliability of the insulating film assembly for the battery are further improved, and the production cost is reduced. And the battery quality is ensured.

Description

Technical Field

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

[0002] In the related art, insulating parts are usually attached to the outer surfaces of the battery shell and the top cover to play the role of insulation and protection to form a complete battery structure. Among them, the shell body is usually wrapped with a blue film, and a certain margin is often left on the end of the blue film facing the top cover so that the blue film can be folded toward the top cover surface, and then a top cover patch is attached to the top cover. However, the part of the blue film folded toward the top cover surface is often not firm enough and is prone to warping and other problems, resulting in low reliability of the top cover patch and the battery is prone to quality problems. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an insulating film assembly for a battery, which can ensure the reliability of the bonding between the first insulating film and the shell, avoid the problems of warping and secondary re-bonding, improve stability and reliability, and ensure the quality of the battery.

[0004] The utility model also provides a battery, which comprises the above-mentioned insulating film assembly for the battery.

[0005] According to an insulating film assembly for a battery according to an embodiment of the utility model, the battery has a shell, the shell includes a shell body and a top cover, at least one of the two opposite ends of the shell body has an open opening, the top cover is covered on the open opening of the shell body, the insulating film assembly includes: a first insulating film, the first insulating film includes a main body portion and a folding portion, the main body portion is attached to a side of the top cover away from the shell body, the folding portion is connected to the outer peripheral wall of the main body portion, and the folding portion is used to fold toward the shell body and attached to the outer wall surface of the shell body.

[0006] According to the insulating film assembly for a battery according to the embodiment of the utility model, the insulating film assembly includes a first insulating film, the first insulating film includes a main body and a folding portion, the main body is attached to the side of the top cover away from the shell body, the folding portion is connected to the outer peripheral wall of the main body, and the folding portion is used to fold toward the shell body and attached to the outer wall surface of the shell body, thereby ensuring the bonding reliability and positioning accuracy between the first insulating film and the shell, avoiding the problem of warping of the first insulating film, avoiding the problem of secondary re-attachment after production, improving production efficiency, and then improving the stability and reliability of the insulating film assembly for the battery, ensuring the quality of the battery.

[0007] In addition, the insulating film assembly for a battery according to the utility model may also have the following additional technical features:

[0008] In some embodiments, the outer contour of the main body is flush with the outer contour of the top cover, the main body is substantially formed in a rectangular shape, and the folded portion extends along the circumferential direction of the main body.

[0009] In some embodiments, along the circumferential direction of the main body, the folded portion is provided with notches at four corners corresponding to the main body.

[0010] In some embodiments, a length of the folded portion folded toward the shell body is a, and a satisfies: 2mm≤a≤8mm.

[0011] In some embodiments, a pole is penetrated on the top cover, and the main body has a pole avoidance hole opposite to the pole; and / or, an explosion-proof valve is provided on the top cover, and the main body has an explosion-proof valve avoidance hole for avoiding the explosion-proof valve; and / or, an injection hole is provided on the top cover, and the main body has an injection hole avoidance hole for avoiding the injection hole.

[0012] In some embodiments, the insulating film assembly further includes: a second insulating film, the second insulating film wrapping the outer wall surface of the shell body, a portion of the second insulating film overlapping the folding portion and located on the side of the folding portion away from or close to the shell body.

[0013] In some embodiments, both opposite ends of the shell body are open, there are two top covers, there are two first insulating films corresponding to the two top covers, and the second insulating film is surrounded in a ring shape and attached to the outer peripheral wall of the shell body.

[0014] In some embodiments, the single layer thickness of the insulating film assembly is 80 μm-150 μm.

[0015] According to an embodiment of the utility model, the battery includes: a shell, the shell includes a shell body and two top covers, at least one of the two opposite ends of the shell body has an open opening, and the top cover is covered on the open opening of the shell body; the above-mentioned insulating film assembly for the battery, the main body part is attached to the side of the top cover away from the shell body, the folding part is connected to the outer peripheral wall of the main body part, and the folding part is used to fold toward the shell body and attached to the outer wall surface of the shell body.

[0016] According to the battery of the embodiment of the utility model, by providing the above-mentioned insulating film assembly for the battery, the insulating film assembly includes a first insulating film, the first insulating film includes a main body and a folding portion, the main body is attached to the side of the top cover away from the shell body, the folding portion is connected to the outer peripheral wall of the main body, and the folding portion is used to fold toward the shell body and attached to the outer wall surface of the shell body, thereby ensuring the bonding reliability and positioning accuracy of the first insulating film and the shell, avoiding the problem of warping of the first insulating film, avoiding the problem of secondary re-attachment after production, improving production efficiency, and then improving the stability and reliability of the insulating film assembly for the battery, ensuring the quality of the battery.

[0017] In addition, the battery according to the utility model may also have the following additional technical features:

[0018] In some embodiments, the length of the battery is 300 mm-1000 mm, the width of the battery is 50 mm-150 mm, and the thickness of the battery is 12 mm-25 mm.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a three-dimensional diagram of a battery according to an embodiment of the utility model;

[0022] Figure 2 is an exploded diagram of a battery according to an embodiment of the utility model;

[0023] Figure 3 It is a front view of a first insulating film of an insulating film assembly for a battery according to an embodiment of the utility model, wherein the folded portion is not folded toward the shell body;

[0024] Figure 4 is a three-dimensional diagram of a first insulating film of an insulating film assembly for a battery according to an embodiment of the utility model;

[0025] Figure 5 It is a front view of the insulating film assembly for a battery according to an embodiment of the utility model and the top cover, wherein the folded portion is not folded toward the shell body and is indicated by the section line;

[0026] Figure 6 This is a front view of the insulating film assembly for a battery and the top cover according to an embodiment of the utility model;

[0027] Figure 7 It is a right side view of the first insulating film of the insulating film assembly for a battery according to an embodiment of the utility model in cooperation with the shell;

[0028] Figure 8 It is a top view of the cooperation between the first insulating film and the shell of the insulating film assembly for the battery according to the embodiment of the utility model.

[0029] Reference numerals:

[0030] 100. Battery;

[0031] 10. Shell; 101. Pole group;

[0032] 1. Shell body; 11. Open mouth;

[0033] 2. Top cover; 21. Pole; 22. Explosion-proof valve; 23. Liquid injection hole;

[0034] 20. Insulating film assembly;

[0035] 3. first insulating film; 31. main body; 311. pole avoidance hole; 32. folding part; 321. notch;

[0036] 4. Second insulating film. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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, an electrical connection, or a communication; 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 the present invention can be understood according to specific circumstances.

[0041] The insulating film assembly 20 for the battery 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0042] like Figure 2 As shown, the battery 100 has a shell 10, in which an electrode group 101 is arranged. The shell 10 includes a shell body 1 and a top cover 2. At least one of the two opposite ends of the shell body 1 has an open opening 11. The top cover 2 covers the open opening 11 of the shell body 1 and is welded to the shell body 1 to isolate the internal and external environments of the battery 100, thereby playing a sealing role.

[0043] Specifically, refer to the attached Figure 2 and attached Figure 6 As shown, the insulating film assembly 20 includes a first insulating film 3, and the first insulating film 3 includes a main body 31 and a folded portion 32. The main body 31 is attached to the side of the top cover 2 away from the shell body 1, and can insulate the battery 100 from the side of the top cover 2 away from the shell body 1, thereby preventing the top cover 2 from contacting with external metal, avoiding short circuit, and preventing wear and scratching of the shell 10. Further, refer to the attached Figure 2 and attached Figure 4 The folding portion 32 is connected to the outer peripheral wall of the main body 31, and is used to fold toward the shell body 1 and be attached to the outer wall surface of the shell body 1, thereby ensuring the bonding reliability and positioning accuracy between the first insulating film 3 and the shell 10, avoiding the problem of warping of the first insulating film 3, avoiding the problem of secondary re-bonding after production, improving production efficiency, and further improving the stability and reliability of the insulating film assembly 20 for the battery 100, thereby ensuring the quality of the battery 100.

[0044] It should be noted that, compared with the prior art of using a top cover patch to insulate the top cover, the price of the first insulating film 3 used in the utility model is relatively low, which can reduce the production cost of the insulating film assembly 20 for the battery 100, thereby reducing the production and processing cost of the battery 100.

[0045] According to the insulating film assembly 20 for the battery 100 according to the embodiment of the utility model, the insulating film assembly 20 includes a first insulating film 3, and the first insulating film 3 includes a main body portion 31 and a folding portion 32. The main body portion 31 is attached to the side of the top cover 2 away from the shell body 1, and the folding portion 32 is connected to the outer peripheral wall of the main body portion 31. The folding portion 32 is used to fold toward the shell body 1 and be attached to the outer wall surface of the shell body 1, thereby ensuring the bonding reliability and positioning accuracy of the first insulating film 3 and the shell 10, avoiding the problem of warping of the first insulating film 3, avoiding the problem of secondary re-bonding after production, improving production efficiency, and then improving the stability and reliability of the insulating film assembly 20 for the battery 100, and ensuring the quality of the battery 100.

[0046] In some embodiments of the present invention, refer to the attached Figure 5 As shown, the outer contour of the main body 31 is flush with the outer contour of the top cover 2, the main body 31 is generally formed into a rectangle, and the folded portion 32 extends along the circumferential direction of the main body 31, which can ensure the coverage area of ​​the main body 31 for the top cover 2, ensure the insulation protection effect of the first insulating film 3 for the top cover 2, reduce the probability of high-voltage arcing, and thus improve the safety and reliability of the battery 100.

[0047] In a further embodiment of the present invention, refer to the attached Figure 3 and attached Figure 4 As shown, along the circumferential direction of the main body 31, the folding portion 32 is provided with notches 321 at the four corners corresponding to the main body 31, which can facilitate the folding of the folding portion 32 toward the shell body 1, avoid folding and overlapping of the folding portion 32 itself, avoid affecting the reliability of the connection between the first insulating film 3 and the shell 10, and ensure the aesthetics of the insulating film assembly 20.

[0048] In some embodiments of the present invention, refer to the attached Figure 7 and attached Figure 8 As shown, the length of the folded portion 32 folded toward the shell body 1 is a, and a satisfies: 2mm≤a≤8mm, which can ensure a sufficient fitting area between the folded portion 32 and the shell body 1, ensure the connection strength between the folded portion 32 and the shell body 1, and thus ensure the reliability of the first insulating film 3. For example, the length a of the folded portion 32 folded toward the shell body 1 can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm.

[0049] In some embodiments of the present invention, refer to the attached Figure 5 and attached Figure 6 As shown, the top cover 2 is provided with a pole 21, and the current inside the battery 100 can be transmitted to the outside through the pole 21 to play a guiding role. The main body 31 has a pole avoidance hole 311 opposite to the pole 21 to avoid the pole 21 and ensure the normal transmission of current.

[0050] Further, see Attachment Figure 2 As shown, the top cover 2 is provided with an explosion-proof valve 22, and the body 31 is provided with an explosion-proof valve avoidance hole for avoiding the explosion-proof valve 22. The setting of the explosion-proof valve 22 can discharge the high-temperature and high-pressure gas inside the battery 100 to avoid fire and cause serious safety accidents, thereby improving the safety performance of the battery 100. Optionally, the top cover 2 is a plain aluminum sheet, and the explosion-proof valve 22 is welded to the top cover 2 by laser.

[0051] Further, see Attachment Figure 2 As shown, the top cover 2 is provided with a liquid injection hole 23 , and the main body 31 is provided with a liquid injection hole avoidance hole for avoiding the liquid injection hole 23 , and electrolyte can be injected into the battery 100 through the liquid injection hole 23 .

[0052] In some embodiments of the present invention, refer to the attached Figure 1 and attached Figure 2 As shown, the insulating film assembly 20 also includes a second insulating film 4, which wraps the outer wall surface of the shell body 1. Part of the second insulating film 4 overlaps with the folding portion 32 and is located on the side of the folding portion 32 away from or close to the shell body 1. It can be understood that when the insulating film assembly 20 is attached to the shell body 10, the main body 31 is first attached to the side of the top cover 2 away from the shell body 1, and then the folding portion 32 is folded toward the shell body 1 and attached to the outer wall surface of the shell body 1, and then the outer surface of the shell body 1 is wrapped with the second insulating film 4, so as to ensure the insulation protection performance of the insulating film assembly 20 for the shell 10, improve the safety and reliability of the battery 100, and ensure personnel safety.

[0053] Of course, the utility model is not limited to this. The outer surface of the shell body 1 can also be wrapped with the second insulating film 4 first, and then the main body 31 is attached to the side of the top cover 2 away from the shell body 1, and finally the folded portion 32 is folded toward the shell body 1 and attached to the outer wall surface of the shell body 1. This can also ensure the insulation protection performance of the insulating film assembly 20 for the shell 10, improve the safety and reliability of the battery 100, and ensure personnel safety.

[0054] In a further embodiment of the present invention, refer to the attached Figure 2As shown, the two opposite ends of the shell body 1 are open, there are two top covers 2, the positive electrode column and the negative electrode column are respectively penetrated on the two top covers 2, there are two first insulating films 3 corresponding to the two top covers 2, the second insulating film 4 is surrounded in a ring shape and attached to the outer peripheral wall of the shell body 1, and the two ends of the second insulating film 4 along the axial direction of the shell body 1 overlap with the folded parts 32 of the two first insulating films 3 respectively to ensure the insulation performance of the battery 100.

[0055] In some embodiments of the utility model, the single layer thickness of the insulating film assembly 20 is 80μm-150μm, which can ensure the insulation and pressure resistance of the insulating film assembly 20. For example, the single layer thickness of the insulating film assembly 20 can be 80μm or 110μm. In a specific example, the single layer thickness of the insulating film assembly 20 is 110μm, the tensile strength is greater than 150Mpa, and the elongation is greater than 50%. The insulating film assembly 20 is attached to the surface of the aluminum alloy, and after standing for 20 minutes, the parameters are tested with a tensile machine. The peel strength of the blue film is 3.5N / cm-6.5N / cm, and the shear strength is greater than 0.5Mpa, thereby ensuring the insulation and pressure resistance of the insulating film assembly 20.

[0056] The utility model further provides a battery 100 having the insulating film assembly 20 for the battery 100 of the above embodiment.

[0057] like Figure 2 As shown, the battery 100 according to the embodiment of the present invention includes a housing 10 and the above-mentioned insulating film assembly 20 for the battery 100 .

[0058] Specifically, refer to the attached Figure 2 As shown, the shell 10 includes a shell body 1 and two top covers 2. At least one of the two opposite ends of the shell body 1 has an open opening 11. The top cover 2 covers the open opening 11 of the shell body 1 and is welded to the shell body 1 to isolate the internal and external environments of the battery 100, thereby playing a sealing role.

[0059] Further, see Attachment Figure 2 and attached Figure 6 As shown, the main body 31 is attached to the side of the top cover 2 away from the shell body 1, which can insulate the battery 100 from the side of the top cover 2 away from the shell body 1, prevent the top cover 2 from contacting with external metal, avoid short circuit, and prevent the shell 10 from being worn and scratched. Figure 2 and attached Figure 4As shown, the folding portion 32 is connected to the outer peripheral wall of the main body portion 31, and the folding portion 32 is used to fold toward the shell body 1 and be attached to the outer wall surface of the shell body 1, so as to ensure the bonding reliability and positioning accuracy of the first insulating film 3 and the shell 10, avoid the problem of warping of the first insulating film 3, avoid the problem of secondary re-bonding after production, improve production efficiency, and further improve the stability and reliability of the insulating film assembly 20 used for the battery 100, thereby ensuring the quality of the battery 100.

[0060] According to the battery 100 of the embodiment of the utility model, the insulating film assembly 20 for the battery 100 is provided as mentioned above, and the insulating film assembly 20 includes a first insulating film 3, and the first insulating film 3 includes a main body portion 31 and a folding portion 32, the main body portion 31 is attached to the side of the top cover 2 away from the shell body 1, and the folding portion 32 is connected to the outer peripheral wall of the main body portion 31, and the folding portion 32 is used to be folded toward the shell body 1 and attached to the outer wall surface of the shell body 1, so as to ensure the bonding reliability and positioning accuracy of the first insulating film 3 and the shell 10, avoid the problem of warping of the first insulating film 3, avoid the problem of secondary re-bonding after production, improve production efficiency, and then improve the stability and reliability of the insulating film assembly 20 for the battery 100, and ensure the quality of the battery 100.

[0061] In some embodiments of the present invention, refer to the attached Figure 1 As shown, the length of the battery 100 is 300mm-1000mm, the width of the battery 100 is 50mm-150mm, and the thickness of the battery 100 is 12mm-25mm, which is convenient for the arrangement of the battery 100 and can realize the de-modularization of the battery 100, making the arrangement of the battery 100 more compact and simpler. For example, the length of battery 100 may be 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm or 1000mm, the width of battery 100 may be 50mm, 70mm, 80mm, 100mm, 120mm, 140mm or 150mm, and the thickness of battery 100 is 12mm, 15mm, 17mm, 19mm, 22mm, 24mm or 25mm. In a specific example, the length of battery 100 is 500mm, the width of battery 100 is 120mm, and the thickness of battery 100 is 16mm.

[0062] The insulating film assembly 20 for the battery 100 and other structures and operations of the battery 100 according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0063] 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 utility model. 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.

[0064] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An insulating film assembly for a battery, It is characterized in that The battery has a shell, the shell includes a shell body and a top cover, at least one of the two opposite ends of the shell body has an open opening, the top cover is arranged on the open opening of the shell body, and the insulating film assembly includes: The first insulating film includes a main body and a folding portion, wherein the main body is attached to a side of the top cover away from the shell body, the folding portion is connected to an outer peripheral wall of the main body, and the folding portion is used to be folded toward the shell body and attached to an outer wall surface of the shell body.

2. The insulating film assembly for a battery according to claim 1, It is characterized in that The outer contour of the main body is flush with the outer contour of the top cover. The main body is substantially formed in a rectangular shape. The folded portion extends along the circumferential direction of the main body.

3. The insulating film assembly for a battery according to claim 2, It is characterized in that Along the circumferential direction of the main body, the folded portion is provided with notches at four corners corresponding to the main body.

4. The insulating film assembly for a battery according to claim 1, It is characterized in that The length of the folded portion folded toward the shell body is a, and a satisfies: 2mm≤a≤8mm.

5. The insulating film assembly for a battery according to claim 1, It is characterized in that The top cover is provided with a pole, and the main body is provided with a pole avoidance hole opposite to the pole; And / or, the top cover is provided with an explosion-proof valve, and the main body is provided with an explosion-proof valve avoidance hole for avoiding the explosion-proof valve; And / or, the top cover is provided with a liquid injection hole, and the main body is provided with a liquid injection hole avoidance hole for avoiding the liquid injection hole.

6. The insulating film assembly for a battery according to claim 1, It is characterized in that The insulating film assembly further comprises: A second insulating film, wherein the second insulating film wraps the outer wall surface of the shell body, and a portion of the second insulating film overlaps with the folded portion and is located on a side of the folded portion that is away from or close to the shell body.

7. The insulating film assembly for a battery according to claim 6, It is characterized in that The two opposite ends of the shell body are open, there are two top covers, there are two first insulating films corresponding to the two top covers, and the second insulating film is surrounded in a ring shape and attached to the outer peripheral wall of the shell body.

8. The insulating film assembly for a battery according to claim 1, It is characterized in that The single layer thickness of the insulating film assembly is 80 μm-150 μm.

9. A battery, It is characterized in that include: A shell, the shell comprising a shell body and two top covers, at least one of the two opposite ends of the shell body having an open opening, and the top cover is arranged to cover the open opening of the shell body; According to the insulating film assembly for a battery according to any one of claims 1 to 8, the main body portion is attached to a side of the top cover away from the shell body, the folding portion is connected to the outer peripheral wall of the main body portion, and the folding portion is used to fold toward the shell body and attached to the outer wall surface of the shell body.

10. The battery according to claim 9, It is characterized in that The length of the battery is 300mm-1000mm, the width of the battery is 50mm-150mm, and the thickness of the battery is 12mm-25mm.

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