Battery cell insulating film, battery and battery pack

Abstract

The utility model provides a battery cell insulating film, a battery and a battery pack. The battery cell insulating film comprises an insulating film split body, the insulating film split body is constructed to be used for wrapping a battery cell, the insulating film split body is provided with a first side and a second side which are oppositely arranged in the first direction, the first side and / or the second side are / is provided with a notch, and the notch penetrates through the insulating film split body in the thickness direction of the insulating film split body. According to the technical scheme, the battery core insulating film can solve the problem that bubbles are generated between a battery and a blue film in the coating process of the blue film in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a cell insulating film, a battery, and a battery pack. Background Technology

[0002] Blue film, a common insulating material, is widely used for the external coating of battery cells to provide electrical isolation and mechanical protection between the cells and the battery pack casing and other cells. However, with the continuous advancement of battery technology and the expansion of application areas, such as new energy vehicles and energy storage systems, higher requirements are placed on the stability, safety, and efficiency of battery packs. Especially in vibration environments, the structural stability of the battery pack directly affects its performance and lifespan. However, in the existing blue film coating process, air bubbles are generated between the battery and the blue film, requiring re-peeling and rework. After peeling, a large area of ​​residual adhesive is left on the battery surface, which needs to be cleaned before re-applying the film, resulting in low production efficiency. Utility Model Content

[0003] The main objective of this invention is to provide a cell insulating film, a battery, and a battery pack that can solve the problem of air bubbles being generated between the battery and the blue film during the coating process in the prior art.

[0004] To achieve the above objectives, according to one aspect of the present invention, a battery cell insulating film is provided, comprising: an insulating film split, the insulating film split being configured to cover a battery cell, the insulating film split having a first side and a second side disposed opposite to each other along a first direction, the first side and / or the second side being provided with a notch, the notch penetrating the insulating film split along the thickness direction of the insulating film split.

[0005] The above design allows for easier venting during the film application process, preventing air bubbles. It also significantly reduces operational complexity and improves production efficiency. Furthermore, the notch design provides a channel for the structural adhesive to directly bond the battery cell while ensuring insulation of the main components. This allows the structural adhesive to adhere more effectively to the designated areas of the battery cell during encapsulation, enhancing the bond strength and stability between the battery cell and the pack. In particular, it effectively prevents the structural adhesive from detaching under vibration or impact conditions.

[0006] Furthermore, both the first and second sides are provided with notches, and the notch on the first side and the notch on the second side are mirror-symmetrically arranged.

[0007] The above settings enable balanced air venting during the film application process. At the same time, the symmetrically arranged notches help to position the battery cells during the wrapping process, ensuring accurate positioning of the battery cells within the film and reducing wrinkles and unevenness.

[0008] Furthermore, at least two notches are provided on both the first and second sides, and the notches on the same side are spaced apart along the second direction.

[0009] The above setup provides more air venting paths, which helps to remove air more evenly during the film application process and reduces the formation of air bubbles. On the other hand, each notch can serve as a bonding window for structural adhesive, enhancing the bonding strength and stability between the cell and the pack. Furthermore, since the notches are spaced apart, localized material accumulation during the film application process can be reduced, lowering the likelihood of wrinkles. The space around each notch can stretch and adapt to the shape of the cell more freely, avoiding wrinkles caused by excessive compression or stretching of the material.

[0010] Furthermore, the notch includes a first side, a second side, and a third side that are connected in sequence and form a U-shaped structure. Along the second direction, the insulating film segment includes two oppositely arranged short sides. The first side and the third side are located on opposite sides of the second side. The third side is located between the short side on its own side and the second side, and there is a first preset distance between the third side and the short side on its own side. The value of the first preset distance is in the range of 25mm to 50mm.

[0011] The above settings can prevent air from being trapped during the coating process, greatly reduce the formation of air bubbles, and improve the tightness of the adhesion between the cell insulation film and the cell surface.

[0012] Furthermore, the insulating film is divided into multiple parts, which are connected sequentially and integrally formed. Between two adjacent insulating film parts, the notches on the sides of the two insulating film parts that are close to each other are joined.

[0013] The above settings help achieve precise cutting and rapid wrapping, improving production efficiency and the consistency of finished products.

[0014] Furthermore, along the second direction, the insulating film has a first end and a second end arranged opposite to each other, and the battery cell has a third end and a fourth end arranged opposite to each other. The first end is configured to protrude from the third end by a second preset distance, and the second end is configured to protrude from the fourth end by a second preset distance. The value of the second preset distance is in the range of 5mm to 10mm.

[0015] The above setup ensures that the edges of the insulating film section fully cover the battery cell, while avoiding waste caused by an excessively long insulating film section.

[0016] Furthermore, the area of ​​the gap on the insulating film segment accounts for 5% to 10%.

[0017] By implementing the above settings, the use of separate insulating film materials can be reduced while ensuring the overall insulation performance of the cell insulating film. This avoids material waste caused by excessive notches and helps to reduce production costs.

[0018] Furthermore, the insulating film is provided with explosion-proof valve clearance holes.

[0019] The above settings ensure that the explosion-proof valve can still work normally after being covered with the battery cell insulation film, and will not be obstructed by the battery cell insulation film, thus being able to release the internal pressure of the battery cell normally.

[0020] According to another aspect of the present invention, a battery is provided, comprising: a cell insulating film as described above; a cell, wherein the cell insulating film covers the outer periphery of the cell.

[0021] According to another aspect of the present invention, a battery pack is provided, comprising: the battery described above.

[0022] By applying the technical solution of this utility model, this application provides notches on the first and / or second sides of the insulating film. On the one hand, this allows for easier air venting during the film application process, preventing the generation of air bubbles. On the other hand, it significantly reduces the operational complexity of the film application process and improves production efficiency. Furthermore, the notch design can provide a channel for the structural adhesive to directly bond the battery cell while ensuring insulation of the main parts of the battery cell. In this way, during battery cell encapsulation, the structural adhesive can be more effectively bonded to the designated area of ​​the battery cell, enhancing the bonding strength and stability between the battery cell and the pack. Especially under vibration or impact conditions, it can effectively prevent the structural adhesive from falling off. Attached Figure Description

[0023] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0024] Figure 1 A schematic diagram of the battery structure of an embodiment of the present invention is shown (before the insulating film is separated and covers the battery cell);

[0025] Figure 2 A partial structural schematic diagram of the battery cell insulating film according to an embodiment of the present invention is shown;

[0026] Figure 3 The diagram shows a structural schematic of a battery according to an embodiment of the present invention (after the insulating film is separately wrapped around the battery cell);

[0027] Figure 4 This diagram shows a battery from another angle (after the insulating film has been separately wrapped around the battery cell) according to an embodiment of the present invention.

[0028] The above figures include the following reference numerals:

[0029] 10. Insulating film in sections; 11. Notch; 111. First side; 112. Second side; 113. Third side; 12. Short side; 13. Explosion-proof valve clearance hole; 14. Square frame; 20. Battery cell; 21. Explosion-proof valve. Detailed Implementation

[0030] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] See also Figures 1 to 4 As shown, the present invention provides a battery cell insulating film, which includes an insulating film body 10, the insulating film body 10 being configured to cover a battery cell 20, the insulating film body 10 having a first side and a second side disposed opposite to each other along a first direction, the first side and / or the second side being provided with a notch 11, the notch 11 penetrating the insulating film body 10 along the thickness direction of the insulating film body 10.

[0032] In this embodiment, the first direction refers to the width direction of the insulating film component 10, the second direction refers to the length direction of the insulating film component 10, and the first direction is perpendicular to the second direction. The thickness direction of the insulating film component 10 refers to the direction perpendicular to the width direction of the insulating film component 10. Figure 1 The orientation of the paper.

[0033] Existing non-porous insulating films require additional processing steps to remove air during lamination, resulting in low production efficiency. This application addresses this by providing notches 11 on the first and / or second sides of the insulating film section 10. This allows for easier air removal during lamination, preventing air bubbles from forming. It also significantly reduces operational complexity and improves production efficiency. Furthermore, the notch 11 design provides a channel for direct bonding of the structural adhesive to the battery cell 20 while ensuring insulation of the main components. This allows the structural adhesive to adhere more effectively to the designated areas of the battery cell 20 during encapsulation, enhancing the bond strength and stability between the battery cell 20 and the pack. Especially under vibration or impact conditions, it effectively prevents the structural adhesive from detaching.

[0034] like Figure 1 As shown, in one embodiment of the present invention, notches 11 are provided on both the first side and the second side, and the notches 11 provided on the first side and the notches 11 provided on the second side are mirror-symmetrically arranged.

[0035] In this embodiment, the mirror-symmetrical notches 11 are designed to achieve balanced air venting during the film application process. When the cell insulation film is tightly attached to the cell 20, air can be simultaneously discharged from the symmetrical notches 11, preventing air from accumulating under the cell insulation film and forming bubbles. At the same time, the symmetrically arranged notches 11 help to position the cell 20 during the wrapping process, ensuring that the cell 20 is accurately positioned within the cell insulation film and reducing wrinkles and unevenness.

[0036] In addition, the battery cell insulating film of this application includes multiple insulating film sections 10, and the multiple insulating film sections 10 are connected in sequence on the sides with notches 11. The battery cell insulating film is rolled up as a whole. When in use, the insulating film sections 10 can be cut off individually. This symmetrical notch 11 design only requires one cut in the middle during the cutting process of the roll material, which reduces the complexity of cutting compared with asymmetrical or multiple independent notches 11.

[0037] like Figure 1 As shown, in one embodiment of the present invention, at least two notches 11 are provided on both the first and second sides, and the notches 11 on the same side are spaced apart along the second direction.

[0038] With the above settings, on the one hand, more air venting paths can be provided, which helps to remove air more evenly during the film application process and reduce the formation of air bubbles. On the other hand, each notch 11 can serve as a bonding window for structural adhesive, enhancing the bonding strength and stability between the battery cell 20 and the pack. Furthermore, since the notches 11 are spaced apart, local accumulation of material during the film application process can be reduced, lowering the possibility of wrinkles. The space around each notch 11 can stretch and adapt to the shape of the battery cell 20 more freely, avoiding wrinkles caused by excessive compression or stretching of the material.

[0039] See also Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the notch 11 includes a first side 111, a second side 112, and a third side 113 that are connected in sequence and form a U-shaped structure. Along the second direction, the insulating film body 10 includes two oppositely arranged short sides 12. The first side 111 and the third side 113 are located on opposite sides of the second side 112. The third side 113 is located between the short side 12 on its own side and the second side 112. The third side 113 has a first preset distance from the short side 12 on its own side. The value of the first preset distance is in the range of 25mm to 50mm.

[0040] In this embodiment, the U-shaped notch 11 serves as an effective venting channel, preventing air from accumulating during the wrapping process, significantly reducing bubble formation, and improving the tightness of the adhesion between the cell insulation film and the surface of the cell 20. A first preset distance of 2.5mm to 3.5mm exists between the third side 113 and the short side 12 on its own side. This distance effectively controls the deformation of the cell insulation film during the wrapping process; too small a distance may cause excessive compression or wrinkling of the insulation film components 10 during wrapping.

[0041] See also Figure 1 and Figure 2 As shown, in one embodiment of the present invention, there are multiple insulating film components 10, which are sequentially connected and integrally formed. Between two adjacent insulating film components 10, the notches 11 on the sides of the two insulating film components 10 that are close to each other are joined.

[0042] In this embodiment, multiple insulating film components 10 are sequentially connected and integrally formed. For storage, they can be unfolded or rolled up. For use, they can be cut along the second direction from the joint of the notches 11 between two adjacent insulating film components 10. On automated production lines, this design facilitates precise cutting and rapid wrapping, improving production efficiency and the consistency of finished products.

[0043] In one embodiment of this utility model, along the second direction, the insulating film split 10 has a first end and a second end arranged opposite to each other, and the battery cell 20 has a third end and a fourth end arranged opposite to each other. The first end is configured to protrude from the third end by a second preset distance, and the second end is configured to protrude from the fourth end by a second preset distance. The value range of the second preset distance is 5mm to 10mm.

[0044] The above settings ensure that the edge of the insulating film detachment 10 fully covers the battery cell 20, while avoiding waste caused by the insulating film detachment 10 being too long.

[0045] In one embodiment of this utility model, the area of ​​the notch 11 on the insulating film split 10 accounts for 5% to 10%.

[0046] With the above settings, a 5% to 10% area ratio of the gap 11 can reduce the use of insulation film components 10 while ensuring the overall insulation performance of the cell insulation film, thus avoiding material waste caused by excessive gaps 11 and helping to reduce production costs.

[0047] See also Figures 1 to 3 As shown, in one embodiment of the present invention, an explosion-proof valve clearance hole 13 is provided on the insulating film body 10.

[0048] The above settings ensure that the explosion-proof valve 21 can still work normally after being covered with the cell insulation film, and will not be obstructed by the cell insulation film, thus being able to release the internal pressure of the cell 20 normally.

[0049] See also Figure 1 , Figure 3 and Figure 4 As shown, according to another aspect of the present invention, a battery is also provided, comprising: a cell insulating film as described above; a cell 20, wherein the cell insulating film covers the outer periphery of the cell 20.

[0050] In this embodiment, the battery cell insulating film has all the technical solutions and effects of the above-mentioned cell insulating film, which will not be repeated here.

[0051] In one embodiment, at least two notches 11 are provided on both the first and second sides. The notches 11 are U-shaped, and the notches 11 on the same side are spaced apart along the second direction. The notches 11 on the first side and the notches 11 on the second side are arranged in a one-to-one correspondence. An insulating film section 10 is used to cover one battery cell 20. Figure 1 Before the coating, the battery cell 20 is placed on the insulating film split 10. After the battery cell 20 is coated, the notch 11 on the first side and the corresponding notch 11 on the second side are connected to form a square frame 14 on the bottom surface of the battery cell 20.

[0052] According to another aspect of the present invention, a battery pack is also provided, comprising: the battery described above.

[0053] In this embodiment, the battery pack has all the technical solutions and effects of the above-mentioned batteries, which will not be repeated here.

[0054] As can be seen from the above description, the above embodiments of this utility model achieve the following technical effects: By setting notches on the first and / or second sides of the insulating film, this application allows for easier air venting during the film application process, avoiding the generation of air bubbles. On the other hand, it can significantly reduce the operational complexity of the film application process and improve production efficiency. Furthermore, the notch design can provide a channel for the structural adhesive to directly bond the battery cell while ensuring the insulation of the main parts of the battery cell. In this way, when the battery cell is packaged, the structural adhesive can be more effectively bonded to the designated area of ​​the battery cell, enhancing the bonding strength and stability between the battery cell and the pack. Especially under vibration or impact conditions, it can effectively prevent the structural adhesive from falling off.

[0055] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery cell insulating film, characterized in that, include: An insulating film component (10) is configured to cover a battery cell (20). The insulating film component (10) has a first side and a second side disposed opposite to each other along a first direction. The first side and / or the second side are provided with a notch (11) that penetrates the insulating film component (10) along the thickness direction of the insulating film component (10).

2. The cell insulating film according to claim 1, characterized in that, Both the first side and the second side are provided with the notch (11), and the notch (11) provided on the first side and the notch (11) provided on the second side are mirror-symmetrically arranged.

3. The cell insulating film according to claim 2, characterized in that, Both the first side and the second side are provided with at least two notches (11), and the notches (11) located on the same side are spaced apart along the second direction.

4. The cell insulating film according to claim 3, characterized in that, The notch (11) includes a first side (111), a second side (112), and a third side (113) that are connected in sequence and form a U-shaped structure. Along the second direction, the insulating film segment (10) includes two oppositely arranged short sides (12). The first side (111) and the third side (113) are located on opposite sides of the second side (112). The third side (113) is located between the short side (12) on its own side and the second side (112). The third side (113) has a first preset distance from the short side (12) on its own side. The value of the first preset distance is in the range of 25mm to 50mm.

5. The cell insulating film according to any one of claims 1 to 4, characterized in that, The insulating film components (10) are multiple, and the multiple insulating film components (10) are connected in sequence and integrally formed. Between two adjacent insulating film components (10), the notches (11) on the side of the two insulating film components (10) that are close to each other are joined.

6. The cell insulating film according to any one of claims 1 to 4, characterized in that, Along the second direction, the insulating film segment (10) has a first end and a second end arranged opposite to each other, and the battery cell (20) has a third end and a fourth end arranged opposite to each other. The first end is configured to protrude from the third end by a second preset distance, and the second end is configured to protrude from the fourth end by a second preset distance. The value of the second preset distance is in the range of 5mm to 10mm.

7. The cell insulating film according to any one of claims 1 to 4, characterized in that, The area of ​​the notch (11) on the insulating film segment (10) is 5% to 10%.

8. The cell insulating film according to any one of claims 1 to 4, characterized in that, An explosion-proof valve clearance hole (13) is provided on the insulating film section (10).

9. A battery, characterized in that, include: The cell insulation film as described in any one of claims 1 to 8; The battery cell (20) has an insulating film covering its outer periphery.

10. A battery pack, characterized in that, include: The battery according to claim 9.

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