Separator and battery

Abstract

The application discloses an insulating sheet and a battery. The insulating sheet is used for covering at least part of the surface of an electric core (100) for insulation and isolation. The insulating sheet (200) has a connecting surface (210) for connecting with at least part of the surface of the electric core (100). The connecting surface (210) comprises a first region (211) and a second region (212) connected with each other. The first region (211) is arranged on the inner side of the second region (212). Both the first region (211) and the second region (212) are provided with a plurality of diffusion grooves (213) which are in communication with each other. The distribution density of the diffusion grooves (213) in the first region (211) is greater than that of the diffusion grooves (213) in the second region (212). The above scheme can solve the problem that the related art insulating sheet is prone to residual gas during the attaching process, thereby affecting the yield of the battery.

Description

Technical Field

[0001] This application belongs to the field of battery design technology, specifically relating to a separator and a battery. Background Technology

[0002] Spacers (such as Mylar sheets) are widely used in battery design. In specific applications, spacers are used to protect the battery cells by covering them with the spacers, providing insulation and preventing the cells from easily coming into contact with other electronic components during operation, which could easily lead to short circuits. However, during the process of attaching the spacers to the surface of the cells, gas may remain between the spacers and the cells, causing the spacers to wrinkle or lift, which can easily affect the battery yield. Utility Model Content

[0003] This utility model discloses a separator and a battery to solve the problem that the separator in the related technology is prone to residual gas during the bonding process, which affects the yield of the battery.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: In a first aspect, this application discloses an insulating sheet for covering at least a portion of the surface of a battery cell for insulating isolation, the insulating sheet having a connection surface for connecting with at least a portion of the surface of the battery cell; The connecting surface includes a first region and a second region connected together. The first region is located inside the second region. Both the first region and the second region are provided with a plurality of interconnected diffusion grooves. The distribution density of the diffusion grooves located in the first region is greater than the distribution density of the diffusion grooves located in the second region.

[0005] Secondly, this application discloses a battery comprising at least one cell, adhesive, and the aforementioned separator, wherein the separator covers at least a portion of the surface of the cell, and the connecting surface is connected to at least a portion of the surface of the cell via the adhesive.

[0006] The technical solution adopted in this utility model can achieve the following technical effects: The separator disclosed in this application improves upon the structure of separators in related technologies by providing multiple interconnected diffusion grooves in both the first and second regions of the separator's connection surface. Furthermore, the distribution density of the diffusion grooves in the first region is greater than that in the second region, and the first region is positioned inside the second region. This structure allows gas between the connection surface of the separator and the surface of the battery cell to diffuse more easily and quickly in the first region, minimizing gas retention. This also allows the adhesive to diffuse more easily and quickly from the first region (higher diffusion groove density) to the second region (lower diffusion groove density), and then dissipate through the diffusion grooves in the second region to the outside of the connection surface and the battery cell surface. This minimizes gas buildup and improves battery yield. Attached Figure Description

[0007] Figure 1 This is an exploded view of the battery disclosed in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the isolation component disclosed in the embodiments of this application; Figure 3 This is a partial structural schematic diagram of the first region disclosed in the embodiments of this application; Figure 4 This is a partial structural schematic diagram of the second region disclosed in an embodiment of this application, wherein, Figure 3 , Figure 4 The small and medium circles represent the flow of the bubbles.

[0008] Explanation of reference numerals in the attached figures: 100-cell, 200 - Isolation plate, 210 - Connecting surface, 211 - First region, 212 - Second region, 213 - Diffusion groove, 201 - Diffusion mesh 300-Frame 400 - Circuit protection components 500-cover plate. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0010] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0011] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0012] Please refer to Figures 1 to 4 This application discloses an insulating sheet 200, which is used to cover at least a portion of the surface of a battery cell 100 for insulation and protection of the battery cell 100. The insulating sheet 200 has a connecting surface 210 for connecting with the surface of the battery cell 100. That is, when the insulating sheet 200 covers at least a portion of the surface of the battery cell 100, the connecting surface 210 is connected with at least a portion of the surface of the battery cell 100. Specifically, the connecting surface 210 can be connected with at least a portion of the surface of the battery cell 100 by adhesive.

[0013] The connecting surface 210 includes a first region 211 and a second region 212 connected to each other. The first region 211 is located inside the second region 212. The first region 211 may be located at the center of the connecting surface 210. Both the first region 211 and the second region 212 are provided with a plurality of interconnected diffusion grooves 213, so that when the insulating sheet 200 covers at least part of the surface of the battery cell 100, the adhesive between the connecting surface 210 and the surface of the battery cell 100 can be contained in the diffusion grooves 213 and can diffuse in the diffusion grooves 213. The gas between the connecting surface 210 and the surface of the battery cell 100 can form bubbles and can diffuse in the diffusion grooves 213 with the flow of adhesive.

[0014] At the same time, the distribution density of the diffusion grooves 213 located in the first region 211 is greater than that of the diffusion grooves 213 located in the second region 212, that is, the number of diffusion grooves 213 per unit area in the first region 211 is greater than the number of diffusion grooves 213 per unit area in the second region 212.

[0015] The insulating sheet disclosed in this application improves the structure of the insulating sheet 200 involved in related technologies by providing multiple interconnected diffusion grooves 213 in both the first region 211 and the second region 212. Furthermore, by making the distribution density of the diffusion grooves 213 in the first region 211 greater than that in the second region 212, and by placing the first region 211 inside the second region 212, this structure ensures that after the insulating sheet 200 is attached to the surface of the battery cell 100, the distribution density of the diffusion grooves 213 in the first region 211 is greater than that in the second region 212. With a distribution density of 3, the gas between the connection surface 210 and the surface of the cell 100 can diffuse more easily and quickly in the first region 211, minimizing gas stagnation. As a result, the adhesive can diffuse more easily and quickly from the first region 211, where the distribution density of the diffusion groove 213 is high, to the second region 212, where the distribution density of the diffusion groove 213 is low. Then, it is discharged outside the surface of the connection surface 210 and the cell 100 through the diffusion groove 213 in the second region 212, so as to eliminate the gas between the surface of the connection surface 210 and the surface of the cell 100 as much as possible, avoid the formation of bubbles, and thus help improve the yield of the battery.

[0016] Furthermore, as mentioned above, since this structure eliminates gas between the connection surface 210 and the surface of the cell 100 as much as possible, this structure can minimize the possibility of gas remaining between the separator 200 and the cell 100, which could cause the separator 200 to wrinkle or warp, thereby improving the yield of the battery.

[0017] In a further technical solution, at least some of the diffusion grooves 213 intersect to form a diffusion network. The diffusion network can have multiple diffusion grids 201 distributed in the first region 211 and the second region 212. The diffusion grids 201 can be triangular diffusion grids. The distribution density of the triangular diffusion grids in the first region 211 can be greater than the distribution density of the triangular diffusion grids in the second region 212. That is, the number of triangular diffusion grids per unit area in the first region 211 is greater than the number of triangular diffusion grids per unit area in the second region 212. This allows the gas between the connecting surface 210 and the surface of the cell 100 to diffuse more easily and quickly from the first region 211 to the second diffusion region 212 with the flow of adhesive, thereby discharging it outside the surface of the connecting surface 210 and the cell 100, and minimizing the formation of bubbles between the connecting surface 210 and the surface of the cell 100, which would affect the yield of the battery.

[0018] In addition, the triangular diffusion grid can more naturally guide the direction changes of the fluid adhesive and gas, allowing the gas to diffuse between the diffusion grooves 213. This gives the gas a more flexible diffusion path, further reducing the risk of gas being trapped in the diffusion grooves 213, causing air bubbles on the surface of the connection surface 210 and the cell 100, which would affect the yield of the battery.

[0019] In one embodiment, at least some of the diffusion grooves 213 can be parallel to each other and extend along the length direction of the connecting surface 210. The length direction of the connecting surface 210 can be perpendicular to the width direction of the connecting surface 210, and the length of the connecting surface 210 can be greater than the width of the connecting surface 210. In this case, the connecting surface 210 can be a square surface. This structure can avoid the problem of the gas diffusion path in the length direction of the connecting surface 210 being easily prolonged due to the bending extension of the connecting surface 210 along the length direction of the connecting surface 210 by using the diffusion grooves 213 extending along the length direction of the connecting surface 210. This allows the gas to be better guided to diffuse along the length direction of the connecting surface 210 with the flow of the adhesive, so that the gas can be more easily discharged to the outside of the connecting surface 210 and the surface of the battery cell 100.

[0020] Furthermore, the width of the diffusion groove 213 extending along the length direction of the connecting surface 210 can be greater than the width of the diffusion groove 213 extending along the direction intersecting the length direction of the connecting surface 210. The width direction of the diffusion groove 213 can be perpendicular to the extension direction of the diffusion groove 213 and parallel to the connecting surface 210, thereby helping to reduce the resistance of gas as it diffuses with the adhesive in the diffusion groove 213 extending along the length direction of the connecting surface 210, so as to further reduce the risk of gas being trapped in the diffusion groove 213.

[0021] In an optional technical solution, the multiple diffusion grooves 213 may include a first group of diffusion grooves 213, a second group of diffusion grooves 213, and a third group of diffusion grooves 213. The first group of diffusion grooves 213 may be parallel to each other, the second group of diffusion grooves 213 may be parallel to each other, and the third group of diffusion grooves 213 may be parallel to each other. The first group of diffusion grooves 213, the second group of diffusion grooves 213, and the third group of diffusion grooves 213 may intersect each other, so that the gas can diffuse more flexibly among the three groups of diffusion grooves 213 with the flow of adhesive, thereby reducing the risk of gas being trapped in the diffusion grooves 213.

[0022] Meanwhile, the extension direction of the first set of diffusion grooves 213 can be parallel to the length direction of the connecting surface 210, and the extension directions of the second set of diffusion grooves 213 can be symmetrical to those of the third set. The axis of symmetry between the extension directions of the second and third sets of diffusion grooves 213 can be parallel to the width direction of the connecting surface 210, so that the diffusion grid 201 can be an isosceles triangular diffusion grid. In this case, the central axis of the isosceles triangular diffusion grid can be parallel to the width direction of the connecting surface 210, that is, the axis of symmetry between the extension directions of the second and third sets of diffusion grooves 213 can be parallel to the central axis of the isosceles triangular diffusion grid. This structure helps guide the adhesive to carry the gas more smoothly through the diffusion grooves 213, allowing the gas to enter and leave the diffusion grooves 213 more evenly, and distributing the gas more uniformly within the diffusion grooves 213, thereby helping to reduce the flow resistance of the adhesive.

[0023] In a further technical solution, the multiple diffusion grooves 213 may include a first group of diffusion grooves 213, a second group of diffusion grooves 213, a third group of diffusion grooves 213, and a fourth group of diffusion grooves 213. The first group of diffusion grooves 213 may be parallel to each other, the second group of diffusion grooves 213 may be parallel to each other, the third group of diffusion grooves 213 may be parallel to each other, and the fourth group of diffusion grooves 213 may be parallel to each other. The first group of diffusion grooves 213, the second group of diffusion grooves 213, and the third group of diffusion grooves 213 may intersect each other and may be evenly distributed in the first region 211 and the second region 212. The fourth group of diffusion grooves 213 may be distributed in the first region 211 and may intersect with the first group of diffusion grooves 213, the second group of diffusion grooves 213, and the third group of diffusion grooves 213.

[0024] Meanwhile, the extension direction of the first group of diffusion grooves 213 can be parallel to the length direction of the connecting surface 210, the extension direction of the second group of diffusion grooves 213 can be symmetrical to the extension direction of the third group of diffusion grooves 213, the axis of symmetry between the extension directions of the second group of diffusion grooves 213 and the extension direction of the third group of diffusion grooves 213 can be parallel to the width direction of the connecting surface 210, and the extension direction of the fourth group of diffusion grooves 213 can be parallel to the width direction of the connecting surface 210, so that the diffusion grid 201 of the first region 211 can include an isosceles triangular diffusion grid, and each isosceles triangular diffusion grid of the first region 211 can be divided into two right-angled triangular diffusion grids to increase the distribution density, and the diffusion grid 201 of the second region 212 can be an isosceles triangular diffusion grid, so that the distribution density of the diffusion grid 201 in the first region 211 can be greater than the distribution density of the diffusion grid 201 in the second region 212.

[0025] In this case, the central axis of the isosceles triangular diffusion grid in the first region 211 can be parallel to the width direction of the connecting surface 210, the central axis of the isosceles triangular diffusion grid in the second region 212 can be parallel to the width direction of the connecting surface 210, and the central axis of the isosceles triangular diffusion grid in the first region 211 can divide each isosceles triangular diffusion grid into two right-angled triangular diffusion grids.

[0026] Specifically, in this structure, since the first group of diffusion grooves 213, the second group of diffusion grooves 213, the third group of diffusion grooves 213, and the fourth group of diffusion grooves 213 are all distributed in the first region 211, and the first group of diffusion grooves 213, the second group of diffusion grooves 213, and the third group of diffusion grooves 213 are all distributed in the second region 212, the distribution density of the diffusion grid 201 in the first region 211 can be greater than the distribution density of the diffusion grid 201 in the second region 212. This allows the first region 211 to have a larger number of diffusion grooves 213. At the same time, since the fourth group of diffusion grooves 213 can intersect with the first group of diffusion grooves 213, the second group of diffusion grooves 213, and the third group of diffusion grooves 213, the intersection of the diffusion grooves 213 in the first region 211 is smoother. This allows the gas to diffuse more smoothly between the diffusion grooves 213 along with the glue, thereby further reducing the flow damping of the glue and indirectly reducing the diffusion damping of the gas.

[0027] Of course, in other embodiments, the distribution density of the diffusion grid 201 in the first region 211 can be greater than that in the second region 212 by increasing the number of the first group of diffusion grooves 213, the second group of diffusion grooves 213 and the third group of diffusion grooves 213 distributed in the first region 211.

[0028] Furthermore, the distances between adjacent diffusion grooves 213 in the first group of diffusion grooves 213, the distances between adjacent diffusion grooves 213 in the second group of diffusion grooves 213, the distances between adjacent diffusion grooves 213 in the third group of diffusion grooves 213, and the distances between adjacent diffusion grooves 213 in the fourth group of diffusion grooves 213 can all be equal, so that the sizes of the isosceles triangular diffusion grids in the first region 211 and the isosceles triangular diffusion grids in the second region 212 are equal, and the sizes of the right-angled triangular diffusion grids in the first region 211 are equal, thereby allowing gas and glue to enter or leave the diffusion grooves 213 more evenly, and thus allowing gas and glue to be distributed more evenly in the diffusion grooves 213.

[0029] Optionally, the angle between the extension direction of the second set of diffusion grooves 213 and the extension direction of the third set of diffusion grooves 213 can be 60 degrees, so that the isosceles triangular diffusion grid in the first region 211 and the isosceles triangular diffusion grid in the second region 212 can both be equilateral triangular diffusion grids, which is beneficial to further improve the uniformity of gas and glue entering or leaving the diffusion grooves 213, and further improve the uniformity of gas and glue distribution in the diffusion grooves 213.

[0030] In this embodiment, the depth of the diffusion groove 213 located in the first region 211 can be less than the depth of the diffusion groove 213 located in the second region 212, and the depth direction of the diffusion groove 213 can be perpendicular to the connecting surface 210. This structure allows the pressure of the diffusion groove 213 located in the first region 211 to be greater than the pressure of the diffusion groove 213 located in the second region 212, thereby making it easier for gas to diffuse from the diffusion groove 213 in the first region 211 to the diffusion groove 213 in the second region 212, which helps to further reduce the risk of gas retention.

[0031] Optionally, the ratio between the depth of the diffusion groove 213 in the first region 211 and the depth of the diffusion groove 213 in the second region 212 can be 1:2. Specifically, the depth of the diffusion groove 213 in the first region 211 can be 20 micrometers, and the depth of the diffusion groove 213 in the second region 212 can be 40 micrometers. In this embodiment, there is no limitation on the specific depth of the diffusion groove 213 in the first region 211 and the specific depth of the diffusion groove 213 in the second region 212.

[0032] In one embodiment, there can be two second regions 212, which can be respectively located on opposite sides of the first region 211. The side of the second region 212 facing the first region 211 can be the inner side of the second region 212. In this case, the first region 211 can be the central region of the connecting surface 210, and the two second regions 212 can be the two end regions of the connecting surface 210. This structure is relatively simple, easy to manufacture, and helps to reduce costs.

[0033] In another embodiment, the second region 212 can be an annular region, surrounding the first region 211. The first region 211 can be located at the center of the second region 212. In this case, the first region 211 can be the central region of the connecting surface 210. In this structure, gas can diffuse relatively evenly from the first region 211 to the second region 212 surrounding the first region 211 along with the adhesive. Specifically, the second region 212 can be a rectangular annular region, and correspondingly, the first region 211 can be a rectangular region.

[0034] Based on the separator 200 disclosed in the embodiments of this application, this application further discloses a battery. The disclosed battery includes at least one cell 100, adhesive, and the separator 200 as described in any of the above embodiments. The separator 200 covers at least a portion of the surface of the cell 100, and the connecting surface 210 is connected to at least a portion of the surface of the cell 100 by adhesive. In this case, the adhesive can be accommodated in the diffusion groove 213. Specifically, the separator 200 can be a Mylar sheet, and this application does not limit the specific type of separator 200.

[0035] Furthermore, the battery may also include a frame 300, a circuit protection component 400, and a cover plate 500. The battery cell 100, the circuit protection component 400, and the cover plate 500 may all be disposed within the frame 300. The cover plate 500 and the frame 300 may form an accommodating space. The circuit protection component 400 may be disposed within the accommodating space. The battery cell 100 may be electrically connected to the circuit protection component 400. The separator 200 may cover at least a portion of the battery cell 100, the frame 300, the circuit protection component 400, and the cover plate 500. In this structure, the separator 200 may be connected to the frame 300, thereby improving the connection stability of the separator 200.

[0036] Optionally, there can be two insulating sheets 200, which can cover the two opposite surfaces of the battery cell 100 respectively to achieve better insulation and isolation effect.

[0037] In this application embodiment, the battery can be a laptop battery, tablet battery, etc., and this application embodiment does not limit the specific type of battery.

[0038] The above embodiments of this utility model focus on describing the differences between the various embodiments. As long as the different optimization features of the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be described in detail here.

[0039] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. An insulating sheet for covering at least a portion of the surface of a battery cell (100) for insulating isolation, characterized in that, The insulating sheet (200) has a connection surface (210) for connecting with at least a portion of the surface of the battery cell (100). The connecting surface (210) includes a first region (211) and a second region (212) connected to each other. The first region (211) is located inside the second region (212). Both the first region (211) and the second region (212) are provided with a plurality of interconnected diffusion grooves (213). The distribution density of the diffusion grooves (213) located in the first region (211) is greater than the distribution density of the diffusion grooves (213) located in the second region (212).

2. The isolation sheet according to claim 1, characterized in that, At least some of the diffusion grooves (213) intersect to form a diffusion network, the diffusion network having a plurality of diffusion grids (201) distributed in the first region (211) and the second region (212), the diffusion grids (201) being triangular diffusion grids, the distribution density of the triangular diffusion grids located in the first region (211) being greater than the distribution density of the triangular diffusion grids located in the second region (212).

3. The isolation sheet according to claim 2, characterized in that, At least some of the diffusion grooves (213) are parallel to each other and extend along the length direction of the connecting surface (210), the length direction of the connecting surface (210) is perpendicular to the width direction of the connecting surface (210), and the length of the connecting surface (210) is greater than the width of the connecting surface (210).

4. The isolation sheet according to claim 3, characterized in that, The plurality of diffusion grooves (213) include a first group of diffusion grooves (213), a second group of diffusion grooves (213) and a third group of diffusion grooves (213). The first group of diffusion grooves (213) are parallel to each other, the second group of diffusion grooves (213) are parallel to each other, the third group of diffusion grooves (213) are parallel to each other, and the first group of diffusion grooves (213), the second group of diffusion grooves (213) and the third group of diffusion grooves (213) intersect each other. The extension direction of the first group of diffusion grooves (213) is parallel to the length direction of the connecting surface (210). The extension direction of the second group of diffusion grooves (213) is symmetrical to the extension direction of the third group of diffusion grooves (213). The axis of symmetry between the extension directions of the second group of diffusion grooves (213) and the extension directions of the third group of diffusion grooves (213) is parallel to the width direction of the connecting surface (210), so that the diffusion grid (201) is an isosceles triangular diffusion grid.

5. The isolation sheet according to claim 3, characterized in that, The plurality of diffusion grooves (213) include a first group of diffusion grooves (213), a second group of diffusion grooves (213), a third group of diffusion grooves (213) and a fourth group of diffusion grooves (213). The first group of diffusion grooves (213) are parallel to each other, the second group of diffusion grooves (213) are parallel to each other, the third group of diffusion grooves (213) are parallel to each other, and the fourth group of diffusion grooves (213) are parallel to each other. The first group of diffusion grooves (213), the second group of diffusion grooves (213), and the third group of diffusion grooves (213) intersect each other and are all distributed in the first region (211) and the second region (212). The fourth group of diffusion grooves (213) is distributed in the first region (211) and intersects with the first group of diffusion grooves (213), the second group of diffusion grooves (213), and the third group of diffusion grooves (213). The extension direction of the first group of diffusion grooves (213) is parallel to the length direction of the connecting surface (210). The extension direction of the second group of diffusion grooves (213) is symmetrical to the extension direction of the third group of diffusion grooves (213). The axis of symmetry between the extension direction of the second group of diffusion grooves (213) and the extension direction of the third group of diffusion grooves (213) is parallel to the width direction of the connecting surface (210). The extension direction of the fourth group of diffusion grooves (213) is parallel to the width direction of the connecting surface (210), so that the distribution density of the diffusion grid (201) located in the first region (211) is greater than the distribution density of the diffusion grid (201) located in the second region (212).

6. The isolation sheet according to claim 3, characterized in that, The width of the diffusion groove (213) extending along the length direction of the connecting surface (210) is greater than the width of the diffusion groove (213) extending along the direction intersecting the length direction of the connecting surface (210). The width direction of the diffusion groove (213) is perpendicular to the extension direction of the diffusion groove (213) and parallel to the connecting surface (210).

7. The isolation sheet according to claim 1, characterized in that, The depth of the diffusion groove (213) located in the first region (211) is less than the depth of the diffusion groove (213) located in the second region (212), and the depth direction of the diffusion groove (213) is perpendicular to the connecting surface (210).

8. The isolation sheet according to claim 1, characterized in that, There are two second regions (212), which are respectively located on opposite sides of the first region (211). The side of the second region (212) facing the first region (211) is the inner side of the second region (212).

9. The isolation sheet according to claim 1, characterized in that, The second region (212) is an annular region, which surrounds the first region (211).

10. A battery, characterized in that, The device includes at least one battery cell (100), adhesive, and a separator (200) as described in any one of claims 1-9, the separator (200) covering at least a portion of the surface of the battery cell (100), and the connecting surface (210) being connected to at least a portion of the surface of the battery cell (100) by the adhesive.

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