Insulation structure of battery cover and battery

Abstract

The present invention relates to the field of battery technology, and in particular to an insulating structure of a cell cover and a cell. The insulating structure of the cell cover includes: an insulating film, on which a fold is formed to divide the insulating film into a first adhesive portion, a second adhesive portion and a third adhesive portion; the second adhesive portion and the third adhesive portion are alternately arranged around the circumference of the first adhesive portion; the first adhesive portion is attached to the cover, the second adhesive portion is bent along the fold so that part of the second adhesive portion is attached to the first surface of the shell, and the third adhesive portion is bent along the fold so that it is attached to the second surface of the shell. The present invention can achieve insulation protection for the cover and allow part of the insulating film to be attached to the shell of the cell, so that the connection between the cover and the shell can be effectively covered, and the insulation effect meets the requirements of the whole package, so as to achieve the purpose of reducing costs and increasing efficiency; in addition, the pasting area is increased, the pasting strength is improved, and the problems of warping and falling off are avoided, thereby ensuring the insulation effect and production efficiency of the cell.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to an insulating structure of a battery cover and a battery. Background Art

[0002] Lithium-ion batteries are currently widely used in various fields such as transportation power supply, power storage power supply, new energy storage power supply, aerospace and military industry, etc., due to their large capacity, high operating voltage, strong charge retention ability, and long cycle life. The structure of lithium-ion batteries includes: cover plate, shell, pole group, electrolyte, etc. The external insulation of the shell is usually achieved by spraying insulating materials, wrapping with insulating tape, etc., and the insulation of the cover is usually achieved by pasting insulating top cover patches.

[0003] At present, in order to improve the density of the entire battery pack, the thickness of single cells is getting thinner and thinner, which makes the size of the cover smaller and smaller. In addition, the cover also integrates poles, explosion-proof valves, cell temperature sensing areas, etc. that need to be avoided, resulting in the effective bonding area between the insulating top cover patch and the cover getting smaller and smaller. As a result, in the cell manufacturing process and subsequent grouping processes, the insulating top cover patch often warps and falls off, seriously affecting the insulation effect and production efficiency of the cell. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a battery cover insulation structure and a battery cell, so as to solve the problem that the cover insulation method of pasting insulating top cover patches is prone to warping and falling off, affecting the insulation effect and production efficiency of the battery cell.

[0005] A first aspect of the present invention provides a cell cover plate insulation structure, comprising an insulation film, wherein a fold is formed on the insulation film to divide the insulation film into a first adhesive portion, a second adhesive portion and a third adhesive portion;

[0006] The second adhesive portion and the third adhesive portion are alternately arranged around the circumference of the first adhesive portion; the first adhesive portion is attached to the cover plate, the second adhesive portion is bent along the fold so that part of the second adhesive portion is attached to the first surface of the shell, and the third adhesive portion is bent along the fold so that it is attached to the second surface of the shell.

[0007] Preferably, an edge portion is formed at an end portion of the second adhesive portion in the first direction, and after the second adhesive portion is attached to the first surface, the second adhesive portion is bent so that the edge portion is attached to the second surface.

[0008] Preferably, the third adhesive portion is attached to the upper layer of the hemming portion.

[0009] Preferably, a notch is provided between the edging portion and the third adhesive portion; before the second adhesive portion is bent, the length dimension of the notch in the first direction is H, 3mm≤H≤6mm, and the width dimension of the notch in the second direction is G, 0.2mm≤G≤0.3mm.

[0010] Preferably, before being bent along the fold, the dimension of the second adhesive portion in the second direction is E, 2.5 mm ≤ E ≤ 10 mm, and the dimension of the third adhesive portion in the first direction is F, 2.5 mm ≤ F ≤ 10 mm.

[0011] Preferably, E=F.

[0012] Preferably, the two second adhesive portions are symmetrically arranged on both sides of the first adhesive portion in the second direction; and the two third adhesive portions are symmetrically arranged on both sides of the first adhesive portion in the first direction.

[0013] Preferably, an avoidance hole is provided on the first adhesive portion.

[0014] Preferably, the cell cover plate insulation structure is a cylindrical structure formed by winding, and the cylindrical structure includes a plurality of the insulation films.

[0015] A second aspect of the present invention provides a battery cell, comprising the battery cell cover plate insulation structure described in any of the above technical solutions.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The cell cover insulation structure of the present invention has an insulation film with a fold formed on it to divide the insulation film into a first adhesive portion, a second adhesive portion and a third adhesive portion; the first adhesive portion is attached to the cover, the second adhesive portion is bent along the fold so that part of the second adhesive portion is attached to the first surface of the shell, and the third adhesive portion is bent along the fold so that it is attached to the second surface of the shell, thereby achieving insulation protection for the cover and allowing part of the insulation film to be attached to the shell of the cell, so that the connection between the cover and the shell can be effectively covered, and the insulation effect meets the requirements of the whole package, thereby achieving the purpose of reducing costs and increasing efficiency; in addition, the adhesive area is increased, the adhesive strength is improved, and problems such as warping and falling off are avoided, thereby ensuring the insulation effect and production efficiency of the cell.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of an insulating film in a cell cover plate insulating structure in an expanded state provided by an embodiment of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at the middle Q;

[0022] Figure 3 A schematic diagram of the size and position of some structures on the insulating film in the cell cover plate insulating structure provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure in which an insulating film is coated on a cover plate and a shell of a battery cell in a battery cell cover plate insulation structure provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of a structure in which the insulating structure of a cell cover plate provided by an embodiment of the present invention is wound into a cylindrical shape.

[0025] Icons: 1-insulating film; 10-crease; 11-first adhesive portion; 12-second adhesive portion; 121-edging portion; 13-third adhesive portion; 14-notch; 15-avoidance hole; 2-cutting film; 20-groove; 21-pointed corner; 30-cover plate; 40-shell; 41-first surface; 42-second surface; D1-first direction; D2-second direction. DETAILED DESCRIPTION

[0026] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0027] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0028] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0029] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0030] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0031] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0032] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0033] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0034] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0035] According to a first aspect of the present invention, a cell cover plate insulation structure is provided, which includes an insulation film 1 .

[0036] Hereinafter, the specific structure of the insulating structure of the cell cover plate 30 according to the present embodiment will be described.

[0037] In this embodiment, the insulating film 1 can be a flexible insulating tape, and the insulating film 1 includes an insulating substrate layer and an insulating adhesive layer in its thickness direction, so that the insulating film 1 can be directly adhered to the surface of the battery cover 30 and the battery shell 40.

[0038] Specifically, Figure 1 and Figure 4 As shown, a fold 10 is formed on the insulating film 1 to divide the insulating film 1 into a plurality of regions including a first pasting portion 11, a second pasting portion 12 and a third pasting portion 13. Figure 1 The dotted line in the figure indicates the position of the fold 10 . When the cell cover 30 is a rectangular structure, the fold 10 is a rectangular frame structure corresponding to the outer edge of the cell cover 30 .

[0039] More specifically, the second pasting portion 12 and the third pasting portion 13 are alternately arranged around the circumference of the first pasting portion 11, that is, the first pasting portion 11 is arranged in the middle of the insulating film 1, and the second pasting portion 12 and the third pasting portion 13 are arranged around the circumference of the first pasting portion 11, wherein a plurality of second pasting portions 12 and third pasting portions 13 are provided, and are arranged in the order of the second pasting portion 12, the third pasting portion 13, the second pasting portion 12, and the third pasting portion 13 on the circumference of the first pasting portion 11; wherein the first pasting portion 11 is attached to the surface of the cover plate 30 facing the outside of the battery cell, and the second pasting portion 11 is bent along the fold 10. The second adhesive portion 12 allows part of the second adhesive portion 12 to be attached to the first surface 41 of the shell 40, and the third adhesive portion 13 is bent along the fold 10 to be attached to the second surface 42 of the shell 40, thereby achieving insulation protection for the cover plate 30 and allowing part of the insulating film 1 to be attached to the shell 40 of the battery cell, so that the connection between the cover plate 30 and the shell 40 can be effectively covered by the insulating film 1, and the insulation effect meets the requirements of the entire package, thereby achieving the purpose of reducing costs and increasing efficiency; in addition, the adhesive area is increased, the adhesive strength is improved, and problems such as warping and falling off are avoided, thereby ensuring the insulation effect and production efficiency of the battery cell.

[0040] The shell 40 of the battery cell is a rectangular shell 40, so that the shell 40 has four side surfaces, two of which are two first surfaces 41 opposite to each other, and the other two side surfaces are two second surfaces 42 opposite to each other. The second surface 42 is arranged adjacent to the first surface 41, and the area of ​​the first surface 41 is greater than the area of ​​the second surface 42.

[0041] Furthermore, if Figure 1 and Figure 4 As shown, the second adhesive portion 12 is formed with a rim portion 121 at the end in the first direction D1. After the second adhesive portion 12 is attached to the first surface 41, the second adhesive portion 12 is bent so that the rim portion 121 is attached to the second surface 42. In this way, the rim portion 121 and the third adhesive portion 13 are attached to the second surface 42 together, thereby achieving full coverage of the side surface of the shell 40, improving the adhesive strength of the insulating film 1, improving the insulation effect, and also improving the wrinkles or warping of the second adhesive portion 12 to a certain extent. Preferably, the rim portion 121 is formed into a right-angled trapezoidal structure, so that the rim portion 121 has a pointed portion at the end in the length direction of the second adhesive portion 12, so that the second adhesive portion 12 can be separated from the third adhesive portion 13, and it can also avoid the rim portion 121 from being attached crookedly or wrinkled.

[0042] In a preferred embodiment, Figure 4 As shown, the third adhesive portion 13 is attached to the upper layer of the edging portion 121, so that the edging portion 121 is wrapped inside the third adhesive portion 13, thereby preventing the edging portion 121 from warping, thereby effectively preventing the insulating film 1 from falling off the battery cell.

[0043] Furthermore, in this embodiment, if Figure 1 and Figure 2 As shown, a notch 14 is provided between the edge portion 121 and the third adhesive portion 13, so that the edge portion 121 is conveniently attached to the second surface 42, and the adaptability of the insulating film 1 is improved to a certain extent, so that the insulating film 1 can be applied to a battery cover 30 with a relatively longer size; specifically, as Figure 2 As shown, before the second adhesive portion 12 is bent, the length dimension of the notch 14 in the first direction D1 is H, 3mm≤H≤6mm, so as to avoid wrinkles on the second adhesive portion 12 and ensure the insulation performance of the insulating film 1. The width dimension of the notch 14 in the second direction D2 is G, 0.2mm≤G≤0.3mm, so as to avoid wrinkles on the edge portion 121 and ensure the insulation performance of the insulating film 1. What is important is that the insulation effect of the corner position where the cover plate 30 and the shell 40 overlap after the insulating film 1 is pasted can be ensured.

[0044] It should be noted that the first direction D1 is perpendicular to the second direction D2 , the first direction D1 is the length direction of the cover plate 30 , and the second direction D2 is the width direction of the cover plate 30 .

[0045] Preferably, if Figure 1 and Figure 2 As shown, before the insulating film 1 is bent along the fold 10, the size of the second adhesive portion 12 in the second direction D2 is E, 2.5mm≤E≤10mm, thereby ensuring the adhesive strength of the insulating film 1 and reducing costs; before the insulating film 1 is bent along the fold 10, the size of the third adhesive portion 13 in the first direction D1 is F, 2.5mm≤F≤10mm, thereby ensuring the adhesive strength of the insulating film 1 and avoiding material waste.

[0046] In a preferred embodiment, Figure 4 As shown, E=F, so that after the insulating film 1 is pasted, the second pasting portion 12 and the third pasting portion 13 attached to the shell 40 are flush with one end away from the cover plate 30, which reduces the risk of warping to a certain extent and ensures the insulation effect.

[0047] Furthermore, in this embodiment, if Figure 3As shown, the two second adhesive portions 12 are symmetrically arranged on both sides of the first adhesive portion 11 in the second direction D2, and the two second adhesive portions 12 have the same size in the second direction D2, both of which are E; the width dimension of the cover plate 30 is B (i.e., the width dimension of the first adhesive portion 11 in the second direction D2), unit mm; the width dimension of the insulating film 1 in the second direction D2 is D, unit mm; E=(DB) / 2, so that the first adhesive portion 11 is arranged at the middle position of the insulating film 1 in the second direction D2; the two third adhesive portions 13 are symmetrically arranged on both sides of the first adhesive portion 11 in the first direction D1, and the two third adhesive portions 13 have the same size in the first direction D1, both of which are F; the length dimension of the cover plate 30 is A (i.e., the length dimension of the first adhesive portion 11 in the first direction D1), unit mm; the length dimension of the insulating film 1 in the first direction D1 is C, unit mm; F=(CA) / 2, so that the first adhesive portion 11 is arranged at the middle position of the insulating film 1 in the first direction D1, to ensure the adhesive reliability of the insulating film 1.

[0048] In this embodiment, if Figures 1 to 4 As shown, the first adhesive portion 11 is provided with an avoidance hole 15, which is a through-hole structure penetrating the insulating film 1, so that the pole, explosion-proof valve and / or injection hole on the cover plate 30 can be avoided, so that the pole, explosion-proof valve and / or injection hole on the cover plate 30 can be exposed, meeting the use requirements of the cover plate 30. The shape, number and position of the avoidance hole 15 are set according to the structure of the cover plate 30.

[0049] In a preferred embodiment, Figure 5 As shown, the insulating structure of the cell cover plate 30 is a tubular structure formed by winding a whole cutting film 2, and the tubular structure includes multiple insulating films 1. When in use, the cutting film 2 is unfolded from the tubular structure and cut to obtain the insulating film 1 attached to each cover plate 30.

[0050] Specifically, the third adhesive portion 13 is arranged on both sides of the cutting film 2 in the width direction, and M-shaped grooves 20 are provided on both sides of the cutting film 2 in the width direction, so that sharp corners 21 are provided at both ends of the cutting film 2 in the width direction, and the line between the two sharp corners 21 in the width direction of the cutting film 2 is the position for cutting the insulating film 1. It should be noted that Figure 5 The structure in the middle dotted frame is the insulating film 1 for pasting the battery cell.

[0051] The following tests are performed on the pasting quality of the insulating films 1 with different sizes of H, G, E and F after being attached to the battery cells. The specific results are shown in Table 1.

[0052] Table 1

[0053]

[0054] Note: “ / ” in the table means that the insulation test and appearance inspection are qualified after the insulation film 1 is pasted.

[0055] Referring to the parameters in the table, it can be seen that in Example 3, Example 4, Example 8 and Example 9, the insulation film 1 was not found to be warped or wrinkled after the battery cells were pasted, and the insulation test was qualified to meet the use requirements of the battery cells, and the yield rate was improved, which proved to a certain extent that the parameter limit range of 2.5mm≤E≤10mm, 2.5mm≤F≤10mm, 3mm≤H≤6mm and 0.2mm≤G≤0.3mm can ensure the insulation effect of the battery cells. In Example 1 and Example 2, since the parameters of E and F are too small, the edge portion 121 is prone to wrinkles, resulting in an increase in the proportion of warping problems; and in Examples 5 to 7, since the size of H is too small, the insulation performance of the insulation film 1 is reduced, and the defective rate of the insulation test is increased.

[0056] According to an insulating structure of a battery cover provided by the present invention, a fold is formed on the insulating film to divide the insulating film into a first adhesive portion, a second adhesive portion and a third adhesive portion; the first adhesive portion is attached to the cover, the second adhesive portion is bent along the fold so that part of the second adhesive portion is attached to the first surface of the shell, and the third adhesive portion is bent along the fold so that it is attached to the second surface of the shell, thereby achieving insulation protection for the cover and allowing part of the insulating film to be attached to the shell of the battery cell, so that the connection between the cover and the shell can be effectively covered, and the insulation effect meets the requirements of the whole package, thereby achieving the purpose of reducing costs and increasing efficiency; in addition, the adhesive area is increased, the adhesive strength is improved, and problems such as warping and falling off are avoided, thereby ensuring the insulation effect and production efficiency of the battery cell.

[0057] A battery cell provided by the present invention includes the battery cell cover plate insulation structure as described above, the insulation film has a large coating area and high bonding strength, the insulation effect meets the requirements of the entire package, reduces costs, and ensures the insulation effect and production efficiency of the battery cell.

[0058] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A cell cover plate insulation structure, characterized in that: The insulating film is pasted on the surface of the cover plate and the housing, and a fold is formed on the insulating film to divide the insulating film into a first pasting portion, a second pasting portion, and a third pasting portion; The second adhesive portion and the third adhesive portion are alternately arranged around the circumference of the first adhesive portion; the first adhesive portion is attached to the cover plate, the second adhesive portion is bent along the fold so that part of the second adhesive portion is attached to the first surface of the shell, and the third adhesive portion is bent along the fold so that it is attached to the second surface of the shell; The second adhesive portion is formed with an edge portion at an end portion in the first direction. After the second adhesive portion is attached to the first surface, the second adhesive portion is bent so that the edge portion is attached to the second surface. The edge portion is formed into a right-angled trapezoidal structure, so that the edge portion is formed with a pointed portion at an end portion in the length direction of the second adhesive portion. The cell cover plate insulation structure is a cylindrical structure formed by winding a whole cut film, and the cylindrical structure includes a plurality of the insulation films; The third adhesive portion is arranged on both sides of the cutting film in the width direction, and M-shaped grooves are provided on both sides of the cutting film in the width direction, so that sharp corners are arranged at both ends of the cutting film in the width direction, and the line between the two sharp corners in the width direction of the cutting film is the position for cutting the insulating film; The third adhesive portion is attached to the upper layer of the hemming portion; A notch is provided between the hemming portion and the third adhesive portion; before the second adhesive portion is bent, the length dimension of the notch in the first direction is H, 3mm≤H≤6mm, and the width dimension of the notch in the second direction is G, 0.2mm≤G≤0.3mm; Before being bent along the fold, the dimension of the second adhesive portion in the second direction is E, 2.5 mm ≤ E ≤ 10 mm, and the dimension of the third adhesive portion in the first direction is F, 2.5 mm ≤ F ≤ 10 mm.

2. The cell cover plate insulation structure according to claim 1, characterized in that: E=F.

3. The cell cover plate insulation structure according to claim 1, characterized in that: The two second adhesive portions are symmetrically arranged on both sides of the first adhesive portion in the second direction; and the two third adhesive portions are symmetrically arranged on both sides of the first adhesive portion in the first direction.

4. The cell cover plate insulation structure according to claim 1, characterized in that: The first adhesive portion is provided with an avoidance hole.

5. A battery cell, characterized in that: The invention comprises the cell cover plate insulation structure as claimed in any one of claims 1 to 4.

Images