Insulating film assembly and battery

Abstract

This utility model belongs to the field of battery technology and discloses an insulating film assembly and a battery. The insulating film assembly is connected to a battery cell. The battery cell includes a first side surface, a second side surface, and a bottom surface. The area of ​​the first side surface is smaller than the area of ​​the second side surface. The insulating film assembly includes a first insulating film, a second insulating film, and a gasket. The first insulating film covers the first side surface and the bottom surface; the second insulating film covers the second side surface and the bottom surface. The first and second insulating films partially overlap to form an overlapping area, which is located on the bottom surface. The gasket abuts against the bottom of the battery cell. The first and second insulating films can restrict the position of the gasket, reduce metal debris and other foreign matter introduced during welding, and improve cutting and assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an insulating film assembly and a battery. Background Technology

[0002] A battery consists of a casing, a cell, and a top cover. To protect the cell and ensure an insulated connection between the cell and the casing, an insulating film is usually wrapped around the cell before it is placed in the casing, and a gasket is placed at the bottom of the cell to separate the cell from the casing and prevent the battery from short-circuiting.

[0003] Currently, the insulating film of square battery cells is usually designed as a single piece. The insulating film is cut into shape, folded and wrapped around the side and bottom of the battery cell. Fixing components are welded to the top or side of the insulating film, and the insulating film is welded to the gasket to fix the position of the insulating film inside the battery.

[0004] However, since the insulating film needs to be welded and fixed in many places, foreign objects such as metal shavings can easily be introduced during the multiple melting and welding process, causing the battery cell to expand. In addition, since the battery cell size is diverse, the size of the insulating film to be cut also needs to be adjusted, which may generate a lot of scrap material, thereby increasing production costs. There is a problem that the one-piece design of the insulating film is not convenient for cutting and assembly. Utility Model Content

[0005] The purpose of this invention is to provide an insulating film assembly and a battery to solve the problem that one-piece insulating films are inconvenient to cut and assemble.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, an insulating film assembly is provided for connection to a battery cell, the battery cell including a first side surface, a second side surface, and a bottom surface, the area of ​​the first side surface being smaller than the area of ​​the second side surface, the insulating film assembly including: a first insulating film covering the first side surface and the bottom surface; a second insulating film covering the second side surface and the bottom surface, the first insulating film and the second insulating film partially overlapping to form an overlapping area, the overlapping area being disposed on the bottom surface; and a gasket abutting against the bottom of the battery cell.

[0008] Preferably, the edge of the overlapping region is equidistant from both ends of the first insulating film; and / or, the edge of the overlapping region is equidistant from both ends of the second insulating film.

[0009] Preferably, both the first insulating film and the second insulating film are rectangular structures.

[0010] Preferably, the bottom surface length of the battery cell is L1, the bottom surface width of the battery cell is W1, the height of the battery cell is H1, the length of the first insulating film is L2, and L2 > 2H1 + L1, and the length of the second insulating film is L3, and L3 > 2H1 + W1.

[0011] Preferably, the insulating film assembly further includes a first fixing member and a second fixing member, the first fixing member being connected to the first insulating film and the second fixing member being connected to the second insulating film, and both the first fixing member and the second fixing member being connected to the battery cell to restrict the position of the first insulating film and the second insulating film.

[0012] Preferably, the first fastener is welded to the first insulating film; and / or, the second fastener is welded to the second insulating film.

[0013] In a second aspect, a battery includes a cell, a housing, a top cover, and an insulating film assembly as described above, wherein the cell is disposed inside the housing, the first insulating film and the second insulating film are both disposed between the housing and the cell, and the gasket is configured to be interference-fitted with the housing.

[0014] Preferably, the insulating film assembly further includes a first fixing member and a second fixing member, the first fixing member being connected to the first insulating film and the second fixing member being connected to the second insulating film. The insulating film assembly also includes a riveting part, which is disposed on at least one of the first fixing member and the second fixing member. The top cover is connected to a lower plastic, and the riveting part is riveted to the lower plastic.

[0015] Preferably, multiple riveting parts are provided, and the multiple riveting parts are respectively provided on the first fixing member and the second fixing member.

[0016] Preferably, the plurality of riveted portions are spaced apart.

[0017] The beneficial effects of this utility model are:

[0018] An insulating film assembly is connected to a battery cell. The battery cell includes a first side surface, a second side surface, and a bottom surface. The area of ​​the first side surface is smaller than the area of ​​the second side surface. The insulating film assembly includes a first insulating film, a second insulating film, and a gasket. The first insulating film covers the first side surface and the bottom surface. The second insulating film covers the second side surface and the bottom surface. The first insulating film and the second insulating film partially overlap to form an overlapping area, which is located on the bottom surface. The gasket abuts against the bottom of the battery cell.

[0019] In this way, the first and second insulating films partially overlap, which can limit the gasket, save the step of welding the gasket, and reduce the introduction of foreign objects such as metal debris, thereby improving the safety and reliability of the battery. The overlapping and cross-shaped first and second insulating films have simple shapes, reduce the difficulty of cutting and assembly, improve work efficiency, and reduce production costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the battery cell structure in one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the assembly of the first insulating film and the second insulating film in one embodiment of the present invention;

[0022] Figure 3 This is a front view of the first insulating film in one embodiment of the present invention;

[0023] Figure 4 This is a front view of the second insulating film in one embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the insulating film assembly in one embodiment of the present invention;

[0025] Figure 6 This is a side sectional view of a battery in one embodiment of the present invention.

[0026] In the picture:

[0027] 1. First insulating film; 2. Second insulating film; 21. Overlapping area; 3. First fixing member; 4. Second fixing member; 5. Riveting part; 6. Battery cell; 61. First side; 62. Second side; 63. Bottom surface; 7. Lower plastic; 71. Positioning hole. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] See Figures 1 to 5 This utility model provides an insulating film assembly connected to a battery cell 6. The battery cell 6 includes a first side surface 61, a second side surface 62, and a bottom surface 63. The area of ​​the first side surface 61 is smaller than the area of ​​the second side surface 62, that is, the first side surface 61 is the narrow side of the battery cell 6, and the second side surface 62 is the wide side of the battery cell 6. The insulating film assembly includes a first insulating film 1, a second insulating film 2, and a gasket. The first insulating film 1 covers the first side surface 61 and the bottom surface 63; the second insulating film 2 covers the second side surface 62 and the bottom surface 63. The first insulating film 1 and the second insulating film 2 partially overlap to form an overlapping area 21, which is located on the bottom surface 63; the gasket abuts against the bottom of the battery cell 6.

[0033] In this embodiment, the area of ​​the overlapping region 21 is equal to the area of ​​the bottom surface 63. The first insulating film 1 and the second insulating film 2 are both disposed between the pad and the battery cell 6 to support the first insulating film 1, the second insulating film 2 and the battery cell.

[0034] Thus, the gasket abuts against the bottom of the cell 6, which can save the step of welding the gasket and reduce the introduction of foreign objects such as metal debris, thereby improving the safety and reliability of the battery. The first insulating film 1 and the second insulating film 2 are partially overlapped and covered to cover the cell 6, which can simplify the shape of the first insulating film 1 and the second insulating film 2, and make it easier to adjust the size of the first insulating film 1 or the second insulating film 2 according to the different sizes of the cell 6, thereby reducing production costs and improving cutting and assembly efficiency.

[0035] It is understandable that the area of ​​the overlapping area 21 can also be larger than the area of ​​the bottom surface 63. That is, after the first insulating film 1 and the second insulating film 2 cover the battery cell 6, the positions of the first insulating film 1 and the second insulating film 2 corresponding to the side edges of the battery cell 6 overlap. The first insulating film 1 and the second insulating film 2 can be connected by means of hot melting, adhesive bonding, etc. The connection method of the first insulating film 1 and the second insulating film 2 can be adjusted according to actual needs, which will not be elaborated here.

[0036] See Figure 2 In some embodiments, the edge of the overlapping region 21 is equidistant from both ends of the first insulating film 1, and the edge of the overlapping region 21 is equidistant from both ends of the second insulating film 2. That is, the first insulating film 1 and the second insulating film 2 are symmetrically arranged on the battery cell 6 to avoid poor local insulation performance of the battery cell 6 and improve the assembly effect of the insulating film assembly.

[0037] In this way, the first insulating film 1 and the second insulating film 2 can stably cover the first side 61, the second side 62 and the bottom surface 63 of the battery cell 6, improve the insulation performance of the insulating film assembly, and facilitate the fixing of the first insulating film 1 and the second insulating film 2 on the top surface of the battery cell 6, thereby improving assembly efficiency and simplifying the assembly process.

[0038] It is understood that the first insulating film 1 can be disposed on the side of the second insulating film 2 facing the battery cell 6, or on the side of the second insulating film 2 away from the battery cell 6. That is, the first insulating film 1 can be stacked on top of the second insulating film 2, or it can be stacked on the bottom of the second insulating film 2.

[0039] See Figure 2 In some embodiments, both the first insulating film 1 and the second insulating film 2 are rectangular structures.

[0040] In this embodiment, the first insulating film 1 and the second insulating film 2 are stacked in a cross shape, and the overlapping area 21 is rectangular. When the first insulating film 1 and the second insulating film 2 cover the battery cell 6, the projection of the overlapping area 21 covers the projection of the bottom surface 63 of the battery cell 6 along the height direction of the battery cell 6.

[0041] In this way, by overlapping the first insulating film 1 and the second insulating film 2, and then placing the battery cell 6 in the overlapping area after assembling the gasket, the battery cell 6 can be initially positioned with the gasket, the first insulating film 1, and the second insulating film 2, simplifying the assembly steps, reducing foreign matter such as metal shavings introduced during the molten welding process, and improving the safety and reliability of the battery. Since both the first insulating film 1 and the second insulating film 2 are rectangular, the cutting difficulty can be reduced, the cutting efficiency can be improved, and the length and width of the first insulating film 1 and the second insulating film 2 can be adjusted according to different battery cell 6 sizes, reducing the scrap generated during the cutting process and reducing the waste disposal process, thereby reducing production costs.

[0042] See Figures 1 to 4In some embodiments, the bottom surface 63 of the battery cell 6 has a length of L1, a width of W1, a height of H1, a length of L2 for the first insulating film 1 (where L2 > 2H1 + L1), and a length of L3 for the second insulating film 2 (where L3 > 2H1 + W1). That is, after the first insulating film 1 and the second insulating film 2 cover the battery cell 6, the ends of the first insulating film 1 and the second insulating film 2 both protrude from the top surface of the battery cell 6.

[0043] In this embodiment, the width of the first insulating film 1 is greater than the width W1 of the bottom surface 63 of the battery cell 6, and the width of the second insulating film 2 is greater than the length L1 of the bottom surface 63 of the battery cell 6, so that the first insulating film 1 and the second insulating film 2 can cover the first side surface 61 and the second side surface 62, thereby improving the reliability of the insulating film assembly.

[0044] Thus, both the first insulating film 1 and the second insulating film 2 have excess portions that can be fixedly connected to the battery cell 6, preventing the first insulating film 1 or the second insulating film 2 from shifting during assembly and subsequent use, thereby reducing the risk of short circuit.

[0045] See Figure 5 and Figure 6 In some embodiments, the insulating film assembly further includes a first fixing member 3 and a second fixing member 4. The first fixing member 3 is connected to the first insulating film 1, and the second fixing member 4 is connected to the second insulating film 2. Both the first fixing member 3 and the second fixing member 4 are connected to the battery cell 6 to limit the position of the first insulating film 1 and the second insulating film 2.

[0046] In this embodiment, two first fixing members 3 and two second fixing members 4 are respectively provided. The two first fixing members 3 are respectively fixedly disposed at both ends of the first insulating film 1, and the two first fixing members 3 are respectively fixedly connected to the two oppositely disposed first side surfaces 61. The two second fixing members 4 are respectively fixedly disposed at both ends of the second insulating film 2, and the two second fixing members 4 are respectively fixedly connected to the two oppositely disposed second side surfaces 62, so that the first insulating film 1 and the second insulating film 2 are both fixedly disposed on the battery cell 6.

[0047] In this way, the first fixing member 3 and the second fixing member 4 can fix the position of the first insulating film 1 and the second insulating film 2 on the cell 6, prevent the first insulating film 1 and the second insulating film 2 from shifting, improve the stability of the insulating film assembly, simplify the assembly process, and improve the safety and reliability of the battery.

[0048] It is understandable that the position and quantity of the first fastener 3 and the second fastener 4 can be adjusted according to actual needs, and will not be listed in detail here.

[0049] See Figure 1 and Figure 5In some embodiments, the first fixing member 3 is welded to the first insulating film 1, and the second fixing member 4 is welded to the second insulating film 2. In this embodiment, the length direction of the first fixing member 3 is parallel to the width direction of the first insulating film 1, and the length direction of the second fixing member 4 is parallel to the width direction of the second insulating film 2. The end edges of the first fixing member 3 and the first insulating film 1 are spaced apart, and the end edges of the second fixing member 4 and the second insulating film 2 are spaced apart. After the first insulating film 1 and the second insulating film 2 respectively cover the first side 61 and the second side 62, the first fixing member 3 is disposed on the first side 61, and the second fixing member 4 is disposed on the second side 62.

[0050] Thus, by setting the first fixing member 3 and the second fixing member 4, the positions of the first insulating film 1 and the second insulating film 2 can be restricted, thereby restricting the position of the gasket, simplifying the assembly and welding process, reducing foreign objects such as metal shavings introduced during the molten welding process, and improving the safety and reliability of the battery; the first fixing member 3 and the second fixing member 4 are respectively set on the first side 61 and the second side 62, which can effectively utilize the space on the first side 61 and the second side 62 of the cell 6, avoid assembly interference with other structures set on the top surface of the cell 6, and improve the assembly effect.

[0051] It is understandable that the first fixing member 3 and the second fixing member 4 can be rivets, buckles, or other structures that can fix the first insulating film 1 and the second insulating film 2. They will not be listed in detail here.

[0052] See Figure 5 and Figure 6 This utility model also provides a battery, including a cell 6, a casing (not shown in the figure), a top cover (not shown in the figure), and an insulating film assembly. The cell 6 is disposed inside the casing, and the first insulating film 1 and the second insulating film 2 are both disposed between the casing and the cell 6. Further, in some embodiments, the gasket is interference-fitted with the casing.

[0053] Thus, after the battery cell 6 equipped with the insulating film assembly is installed in the housing, the housing can restrict the position of the gasket due to the interference fit between the gasket and the housing, saving the step of welding the gasket and avoiding the introduction of more metal debris and other foreign objects during multiple melting and welding processes; the first insulating film 1 and the second insulating film 2 are arranged crosswise and fixed by the first fixing member 3 and the second fixing member 4 respectively, which can improve the stability of the first insulating film 1 and the second insulating film 2 in the housing and improve the assembly effect.

[0054] It is understandable that the gasket can also be attached to the first insulating film 1 or the second insulating film 2. The connection method between the gasket and the first insulating film 1 or the second insulating film 2 can be adjusted according to actual needs, and will not be listed in detail here.

[0055] See Figure 5 and Figure 6 In some embodiments, the insulating film assembly further includes a riveting portion 5, which is disposed on at least one of the first fixing member 3 and the second fixing member 4. The top cover is connected to a lower plastic 7, and the riveting portion 5 is riveted to the lower plastic 7. Further, multiple riveting portions 5 are provided, and the multiple riveting portions 5 are respectively disposed on the first fixing member 3 and the second fixing member 4.

[0056] In this embodiment, the lower plastic 7 has a positioning hole 71, and the riveting part 5 is connected with a rivet. The rivet passes through the positioning hole 71 to achieve a fixed connection between the lower plastic 7 and the riveting part 5.

[0057] Thus, the riveting of the riveting part 5 to the lower plastic 7 restricts the relative positions of the first insulating film 1, the second insulating film 2 and the lower plastic 7, saves welding steps, and allows the first insulating film 1, the second insulating film 2 and the gasket to be stably placed in the housing, and the first insulating film 1 and the second insulating film 2 to be tightly attached to the first side 61 and the second side 62 respectively, so that the battery cell 6 is insulated from the housing and the assembly efficiency is improved.

[0058] See Figure 5 In some embodiments, multiple riveted portions 5 are spaced apart.

[0059] In this embodiment, two riveting parts 5 are connected to a first fixing member 3, and two riveting parts 5 are connected to a second fixing member 4. The positioning holes 71 are set one-to-one with the riveting parts 5.

[0060] Thus, multiple riveting parts 5 can improve the connection stability between the second insulating film 2 and the battery cell 6, so that the first insulating film 1 and the second insulating film 2 are tightly attached to the outer wall of the battery cell 6, and prevent the first insulating film 1 and the second insulating film 2 from loosening or shifting when inserted into the casing; by fixing the first insulating film 1 and the second insulating film 2 to the battery cell 6 through the riveting parts 5, the first fixing part 3 and the second fixing part 4 can simplify the structure of the first insulating film 1 and the second insulating film 2, and facilitate cutting and assembly.

[0061] Understandably, the number of riveted parts 5 can be adjusted according to actual needs, and will not be listed in detail here.

[0062] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An insulating film assembly, characterized by comprising: Connected to a battery cell (6), the battery cell (6) includes a first side surface (61), a second side surface (62), and a bottom surface (63), wherein the area of ​​the first side surface (61) is smaller than the area of ​​the second side surface (62), and the insulating film assembly includes: A first insulating film (1) is provided, which covers the first side surface (61) and the bottom surface (63); A second insulating film (2) is provided to cover the second side surface (62) and the bottom surface (63). The first insulating film (1) and the second insulating film (2) partially overlap to form an overlapping area (21), which is located on the bottom surface (63). A gasket is placed against the bottom of the battery cell (6).

2. The insulating film assembly of claim 1, wherein, The edge of the overlapping region (21) is equidistant from both ends of the first insulating film (1); and / or, the edge of the overlapping region (21) is equidistant from both ends of the second insulating film (2).

3. The insulating film assembly of claim 1, wherein, Both the first insulating film (1) and the second insulating film (2) are rectangular structures.

4. The insulating film assembly of claim 3, wherein, The length of the bottom surface (63) of the battery cell (6) is L1, the width of the bottom surface (63) of the battery cell (6) is W1, the height of the battery cell (6) is H1, the length of the first insulating film (1) is L2, and L2 > 2H1 + L1, and the length of the second insulating film (2) is L3, and L3 > 2H1 + W1.

5. The insulating film assembly of claim 1, wherein, The insulating film assembly further includes a first fixing member (3) and a second fixing member (4). The first fixing member (3) is connected to the first insulating film (1), and the second fixing member (4) is connected to the second insulating film (2). Both the first fixing member (3) and the second fixing member (4) are connected to the battery cell (6) to restrict the position of the first insulating film (1) and the second insulating film (2).

6. The insulating film assembly of claim 5, wherein, The first fastener (3) is welded to the first insulating film (1); and / or, the second fastener (4) is welded to the second insulating film (2).

7. A battery, characterized by The device includes a battery cell (6), a housing, a top cover, and an insulating film assembly as described in any one of claims 1-6, wherein the battery cell (6) is disposed inside the housing, the first insulating film (1) and the second insulating film (2) are both disposed between the housing and the battery cell (6), and the gasket is configured to be interference-fitted with the housing.

8. The battery of claim 7, wherein, The insulating film assembly further includes a first fixing member (3) and a second fixing member (4), the first fixing member (3) being connected to the first insulating film (1) and the second fixing member (4) being connected to the second insulating film (2). The insulating film assembly further includes a riveting part (5), the riveting part (5) being disposed on at least one of the first fixing member (3) and the second fixing member (4). The top cover is connected to a lower plastic (7), and the riveting part (5) is riveted to the lower plastic (7).

9. The battery of claim 8, wherein, The riveting part (5) is provided in multiple ways, and the multiple riveting parts (5) are respectively provided on the first fixing member (3) and the second fixing member (4).

10. The battery of claim 9, wherein, Multiple riveting portions (5) are spaced apart.

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