Insulating film assembly for battery cell and battery cell

Abstract

The battery cell is provided with a shell, the shell comprises a shell body and a top cover, at least one of two opposite ends of the shell body is provided with an opening, the top cover covers the opening, an explosion-proof valve is arranged on the top cover, the insulating film assembly comprises a first insulating film, the first insulating film comprises a body part and a shielding part, the shielding part is arranged on the body part, and the first insulating film is arranged on the shielding part. The body part wraps the peripheral wall of the shell body, the shielding part is connected with the end, close to the top cover, of the body part, and the shielding part is used for being folded towards the top cover and attached to the outer side of the anti-explosion valve. According to the insulating film assembly for the battery cell, the shell body and the anti-explosion valve can be protected, the safety performance of the battery cell is ensured, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field more particularly, relate to a kind of insulating film subassembly and electric core for electric core. BACKGROUND

[0002] In the related art, the explosion-proof valve patch is pasted on the top cover. In the process of electric core wire, the explosion-proof valve patch is easily polluted by the electrolyte of the electric core, affected by temperature, etc., so that the adhesion between the explosion-proof valve patch and the top cover is reduced. In the subsequent module stacking, battery pack process and even use process, the explosion-proof valve patch is prone to fall off, which reduces the safety performance of the electric core and causes the battery pack to have a safety hazard. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. To this end, one object of the utility model is to provide an insulating film subassembly for an electric core. The insulating film subassembly for the electric core can protect the shell body and the explosion-proof valve, ensure the safety performance of the electric core, and reduce production costs.

[0004] Another object of the utility model is to provide an electric core with the above-mentioned insulating film subassembly.

[0005] According to the insulating film subassembly for the electric core of the utility model embodiment, the electric core has a shell, the shell includes a shell body and a top cover, at least one end of the shell body has an open port, the top cover is arranged on the open port, the top cover is provided with an explosion-proof valve, and the insulating film subassembly includes a first insulating film. The first insulating film includes a body part and a shielding part. The body part wraps the outer peripheral wall of the shell body. The shielding part is connected to one end of the body part close to the top cover. The shielding part is used to fold towards the top cover and is attached to the outside of the explosion-proof valve.

[0006] According to the insulating film subassembly for the electric core of the utility model embodiment, the body part of the first insulating film wraps the outer peripheral wall of the shell body. The shielding part of the first insulating film is connected to one end of the body part close to the top cover. The shielding part is used to fold towards the top cover and is attached to the outside of the explosion-proof valve. The first insulating film can protect the explosion-proof valve while achieving insulation protection of the shell body. This avoids the problem of reduced adhesion of the explosion-proof valve patch pasted on the top cover in the related art due to process effects, and ensures the safety performance of the electric core. In addition, it is beneficial to reduce the assembly process and reduce production costs.

[0007] In addition, the insulating film subassembly for the electric core according to the above-mentioned embodiment of the utility model can also have the following additional technical features:

[0008] According to some embodiments of the utility model, the first flange and the second flange are connected with the first insulating film respectively, which is located on both sides of the shell body in the thickness direction.

[0009] According to some embodiments of the utility model, the overlapping width of the first flange and the second flange is 3mm-5mm in the extending direction of the first flange and the second flange.

[0010] According to some embodiments of the utility model, the first flange and the second flange are connected with the first insulating film respectively, which is located on both sides of the shell body in the thickness direction.

[0011] According to some embodiments of the utility model, the first insulating film further comprises: a folding part, which is connected with one end of the body part close to the top cover, is used for folding towards the top cover and is attached to the outer wall surface of the top cover, and is connected with the shielding part.

[0012] According to some embodiments of the utility model, the length of the folding part folding towards the top cover is greater than or equal to 2.5mm.

[0013] According to some embodiments of the utility model, the insulating film assembly further comprises: a second insulating film, which is attached to one side of the top cover away from the shell body, and part of the second insulating film overlaps with the folding part.

[0014] According to some embodiments of the utility model, the second insulating film is provided with a relief hole, and the relief hole is opposite to the shielding part.

[0015] According to some embodiments of the utility model, the second insulating film is provided with a relief hole, and the relief hole is opposite to the shielding part.

[0016] According to the battery cell of the embodiment of the utility model, the outer peripheral wall of the shell body is wrapped by the body part of the first insulating film, one end of the body part of the first insulating film close to the top cover is connected with the shielding part, the shielding part is used for being folded towards the top cover and being attached to the outside of the explosion-proof valve, so that the first insulating film can protect the explosion-proof valve while realizing the insulation protection of the shell body, the problem that the explosion-proof valve patch attached to the top cover is easily affected by the process to reduce the attachment force and cause the problem of warping and falling off in the subsequent process is avoided, the safety performance of the battery cell is ensured, and the assembly process is facilitated, and the production cost is reduced.

[0017] According to some embodiments of the utility model, the shell body and the top cover are welded.

[0018] The additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0020] Figure 1 is a structural schematic view of the battery cell according to the embodiment of the utility model;

[0021] Figure 2 is Figure 1 the enlarged structural schematic view of the place A in the circle.

[0022] REFERENCE NUMERALS

[0023] 100, insulating film assembly; 200, battery cell;

[0024] 10, first insulating film; 11, body part; 12, shielding part; 13, folding part; 121, first folding edge; 122, second folding edge;

[0025] 20, second insulating film; 21, avoiding hole;

[0026] 30, top cover. DETAILED DESCRIPTION

[0027] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as the limitation of the utility model.

[0028] In the description of the utility model, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0029] In the description of the utility model, "first feature", "second feature" can include one or more features, the meaning of "multiple" is two or more, and "above" or "below" the first feature in the second feature can include direct contact of the first and second features, or can include that the first and second features are not in direct contact but are in contact through another feature between them, and "above", "above" and "above" of the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.

[0030] The insulating film assembly 100 for the battery cell 200 according to the embodiment of the utility model is described below with reference to the drawings.

[0031] Referring to Figure 1 With Figure 2 As shown in the figure, the battery cell 200 according to the embodiment of the utility model comprises a shell and an insulating film assembly 100 for the battery cell 200 according to the embodiment of the utility model, the shell comprises a shell body and a top cover 30, at least one end of the shell body has an open port, and the top cover 30 is arranged on the open port, which facilitates the assembly of the pole group of the battery cell 200, is conducive to improving the assembly efficiency, and can protect the pole group through the shell to avoid damage caused by the exposure of the pole group, which is conducive to prolonging the service life of the pole group. The top cover 30 is provided with an explosion-proof valve, when the battery cell 200 occurs thermal runaway, the gas in the shell can be discharged through the explosion-proof valve, realizing pressure relief and exhaust, releasing the internal pressure of the battery cell 200, and ensuring the safety of the battery cell 200. The insulating film assembly 100 for the battery cell 200 according to the embodiment of the utility model comprises a first insulating film 10.

[0032] Specifically, the first insulating film 10 comprises a body part 11, the body part 11 wraps the outer peripheral wall of the shell body, which can realize the insulation protection of the first insulating film 10 to the outer peripheral wall of the shell body, avoid short circuit problem, is conducive to improving the safety and reliability of the battery cell 200, ensures the safety of personnel, and can prevent the shell body from being worn, scratched and the like, which is conducive to prolonging the service life.

[0033] In some embodiments, the shell body and the top cover 30 are welded, which can ensure reliable connection of the shell body and the top cover 30, so that the shell body and the top cover 30 can form a closed space for protecting the pole group, ensure good protection effect on the pole group, and reduce production cost.

[0034] In the related art, the explosion-proof valve patch is pasted on the top cover, and in the process of the battery cell line, such as battery cell liquid injection, high-temperature baking, top cover and shell body welding and other processes, the explosion-proof valve patch is easily polluted by the electrolyte of the battery cell, affected by temperature and the like, so that the adhesion of the explosion-proof valve patch and the top cover is reduced, and in the subsequent module stacking, battery pack process and even use process, the explosion-proof valve patch is prone to falling off, thereby reducing the safety performance of the battery cell and causing the battery pack to have a safety hazard.

[0035] Therefore, in the utility model, as Figure 1 And Figure 2 As shown in the figure, the first insulating film 10 further includes a shielding part 12 connected to one end of the body part 11 close to the top cover 30, the shielding part 12 can be folded towards the top cover 30, and the shielding part 12 can be pasted on the outside of the explosion-proof valve, so that the shielding part 12 can protect the explosion-proof valve and avoid damage caused by exposure, ensuring the safety of the battery cell 200. At the same time, it can avoid the problem that the explosion-proof valve patch pasted on the top cover in the related art is easily affected by the process and the adhesion is reduced, and the problem of warping and falling off occurs subsequently, thereby ensuring the safety performance of the battery cell 200, and reducing the process of pasting the explosion-proof valve patch on the top cover 30, which is conducive to reducing the production cost.

[0036] In some embodiments, the battery cell 200 further includes an insulating sheet wrapped around the outer peripheral wall of the pole group, which can protect the pole group and prevent the pole group from contacting the shell to cause internal short circuit of the battery cell 200 and other problems, ensuring the safety of the battery cell 200.

[0037] In some embodiments, the battery cell 200 can be a lithium ion battery, which has the advantages of large capacity, high working voltage, strong charge retention capability, long cycle life and the like, and can be widely applied in various fields such as transportation power supply, power storage power supply, new energy storage power supply, aerospace and military industry, to meet the required use requirements.

[0038] According to the insulating film assembly 100 of the embodiment of the utility model, the body part 11 of the first insulating film 10 wraps the outer peripheral wall of the shell body, one end of the body part 11 of the first insulating film 10 is connected with the shielding part 12 close to the top cover 30, the shielding part 12 is used for being folded towards the top cover 30 and being attached to the outer side of the explosion-proof valve, so that the first insulating film 10 can protect the explosion-proof valve while realizing the insulation protection of the shell body, the problem that the explosion-proof valve patch attached on the top cover is easily affected by the process to reduce the attachment force and cause the problem of warping and falling in the subsequent process is avoided, the safety performance of the battery cell 200 is ensured, and the assembly process is facilitated, and the production cost is reduced.

[0039] According to the battery cell 200 of the embodiment of the utility model, the body part 11 of the first insulating film 10 wraps the outer peripheral wall of the shell body, one end of the body part 11 of the first insulating film 10 is connected with the shielding part 12 close to the top cover 30, the shielding part 12 is used for being folded towards the top cover 30 and being attached to the outer side of the explosion-proof valve, so that the first insulating film 10 can protect the explosion-proof valve while realizing the insulation protection of the shell body, the problem that the explosion-proof valve patch attached on the top cover is easily affected by the process to reduce the attachment force and cause the problem of warping and falling in the subsequent process is avoided, the safety performance of the battery cell 200 is ensured, and the assembly process is facilitated, and the production cost is reduced.

[0040] In some embodiments of the utility model, as shown in Figure 2 The shielding part 12 includes a first flange 121 and a second flange 122, the first flange 121 and the second flange 122 are connected with the body part 11 on both sides of the explosion-proof valve respectively, the connection between the shielding part 12 and the body part 11 can be realized, the first flange 121 and the second flange 122 extend towards the direction close to each other, and the first flange 121 and the second flange 122 are connected, so that the first flange 121 and the second flange 122 can reliably protect the explosion-proof valve, and the structure of the shielding part 12 is simple, the shielding part 12 is facilitated to be processed, and the attachment efficiency is improved.

[0041] According to some embodiments of the utility model, as shown in Figure 2As shown, the overlapping width of the first flange 121 and the second flange 122 in the extending direction of the first flange 121 and the second flange 122 is 3mm-5mm, that is, the overlapping width of the first flange 121 and the second flange 122 in the extending direction of the first flange 121 and the second flange 122 is W1 and satisfies 3mm≤W1≤5mm. Within the above size range, the reliable adhesion of the first flange 121 and the second flange 122 can be ensured, and problems such as separation can be avoided, the reliable protection of the explosion-proof valve can be ensured, and when the battery cell 200 is in thermal runaway, the problem that the adhesion strength of the first flange 121 and the second flange 122 is too large to cause the gas in the shell to be difficult to rush out of the explosion-proof valve can be avoided, and the use safety of the battery cell 200 can be ensured. For example, in some specific embodiments, the overlapping width of the first flange 121 and the second flange 122 in the extending direction of the first flange 121 and the second flange 122 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0042] In some embodiments, as shown in Figure 1 With Figure 2 As shown, the first flange 121 and the second flange 122 are connected with the first insulating film 10 located on both sides in the shell body thickness direction (for example, the front-back direction shown in Figure 1 As shown, the first flange 121 and the second flange 122 are connected with the first insulating film 10 located on both sides in the shell body thickness direction (for example, the front-back direction shown in

[0043] It should be noted that, for the convenience of description, the "upper", "lower", "front" and "rear" directions in the utility model are based on the positional relationship shown in the drawings, and are not limited to the actual application process.

[0044] According to some embodiments of the utility model, as shown in Figure 2 As shown, the first insulating film 10 further comprises a folding part 13, the folding part 13 is connected with one end of the body part 11 close to the top cover 30, the folding part 13 can be folded towards the top cover 30, and the folding part 13 is attached to the outer wall surface of the top cover 30, which can ensure the adhesion reliability and positioning accuracy of the first insulating film 10 and the shell, avoid the problem of warping of the first insulating film 10, avoid the problem of secondary reattachment after production, improve the production efficiency, thereby improving the stability and reliability of the insulating film assembly 100, and ensuring the quality of the battery cell 200. In addition, the folding part 13 is connected with the shielding part 12, which can improve the connection strength of the shielding part 12, ensure the reliable adhesion of the shielding part 12, avoid problems such as warping and falling off, and ensure the use safety of the battery cell 200.

[0045] In some embodiments, the shell body has two open ends, and two top covers 30 are arranged on the two open ends respectively, one of the two top covers 30 is provided with an explosion-proof valve, and different shell setting requirements can be achieved. The body part 11 is annular and arranged on the outer wall of the shell body, which can achieve the insulation protection requirement of the shell body. The two ends of the body part 11 towards the two open ends are connected with two folding parts 13, respectively. The two folding parts 13 are folded towards the top cover 30 on the same side and arranged on the outer wall of the top cover 30 on the same side, which ensures the reliable connection of the first insulation film 10 and the shell.

[0046] In addition, as shown in Figure 2 , one end of the body part 11 close to the top cover 30 provided with the explosion-proof valve (for example, the upper end shown in Figure 2 ) is provided with a shielding part 12, the shielding part 12 is connected with the folding part 13 on the same side, which ensures the connection strength of the shielding part 12. The shielding part 12 can be folded towards the top cover 30 and arranged on the outer side of the explosion-proof valve, which realizes the protection of the explosion-proof valve and ensures the safety of the battery cell 200.

[0047] In some embodiments, as shown in Figure 2 , the length of the folding part 13 folded towards the top cover 30 is greater than or equal to 2.5 mm, that is, the length of the folding part 13 folded towards the top cover 30 is W2 and satisfies W2≥2.5 mm. Within the above size range, the folding part 13 and the top cover 30 have sufficient bonding area, which guarantees the connection strength of the folding part 13 and the top cover 30, thereby ensuring the adhesion reliability of the first insulation film 10. For example, in some specific embodiments, the length of the folding part 13 folded towards the top cover 30 can be 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0048] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 , the insulation film assembly 100 further comprises a second insulation film 20, the second insulation film 20 is arranged on the side of the top cover 30 away from the shell body, and part of the second insulation film 20 overlaps with the folding part 13. The second insulation film 20 can realize the insulation protection of the side of the top cover 30 away from the shell body, avoid the short circuit problem caused by the contact between the top cover 30 and the external metal, and improve the safety and reliability of the battery cell 200. In addition, the second insulation film 20 can prevent the top cover 30 from being worn or scratched, which is beneficial to prolong the service life.

[0049] In some embodiments, as shown in Figure 1 and Figure 2As shown, the second insulating film 20 is provided with a relief hole 21, the relief hole 21 is opposite to the shielding part 12, so that the relief hole 21 can avoid the explosion-proof valve, when the battery cell 200 occurs thermal runaway, the second insulating film 20 can avoid the problem that the gas in the shell is blocked to cause the gas in the shell not to be easily rushed out from the explosion-proof valve, and ensure the use safety of the battery cell 200.

[0050] The other constitution and operation of the insulating film assembly 100 and the battery cell 200 according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0051] In the description of the present application, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] In the description of the present application, the description of the terms "embodiment", "specific embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, the scope of the present application is defined by the claims and their equivalents.

Claims

1. An insulation film assembly for an electrical cell, characterized by, The electric core has a shell, the shell includes a shell body and a top cover, at least one end of the shell body has an open mouth, the top cover is arranged on the open mouth, the top cover is provided with an explosion-proof valve, the insulation film assembly includes: The first insulation film includes a body part and a shielding part, the body part wraps the outer peripheral wall of the shell body, and the shielding part is connected to one end of the body part close to the top cover, and the shielding part is used for being folded towards the top cover and being attached to the outside of the explosion-proof valve.

2. The insulation film assembly for an electrical cell of claim 1, wherein, The shielding part includes: The first flange and the second flange are respectively connected to the body part on both sides of the explosion-proof valve, extend towards each other, and are connected.

3. The insulation film assembly for an electrical cell of claim 2, wherein, In the extension direction of the first flange and the second flange, the overlapping width of the first flange and the second flange is 3mm-5mm.

4. The insulation film assembly for an electrical cell of claim 2, wherein, The first flange and the second flange are respectively connected to the first insulation film on both sides of the shell body in the thickness direction.

5. The insulation film assembly for an electrical cell of claim 1, wherein, The first insulation film further includes: The folding part is connected to one end of the body part close to the top cover, is used for being folded towards the top cover and being attached to the outer wall surface of the top cover, and is connected to the shielding part.

6. The insulating film assembly for an electrical cell of claim 5, wherein, The length of the folding part folded towards the top cover is greater than or equal to 2.5mm.

7. The insulating film assembly for an electrical cell of claim 5, wherein, The insulation film assembly further includes: The second insulation film is attached to one side of the top cover away from the shell body, and part of the second insulation film overlaps the folding part.

8. The insulating film assembly for an electrical cell of claim 7, wherein, The second insulation film is provided with a relief hole opposite to the shielding part.

9. An electric cell characterized by It includes: The shell includes a shell body and a top cover, at least one end of the shell body has an open mouth, the open mouth is covered with the top cover, and the top cover is provided with an explosion-proof valve, The insulation film assembly for the electric core according to any one of claims 1-8, the body part wraps the outer peripheral wall of the shell body, the shielding part is connected to one end of the body part close to the top cover, and the shielding part is used for being folded towards the top cover and being attached to the outside of the explosion-proof valve.

10. The electric cell of claim 9, wherein, The shell body and the top cover are welded.

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