Battery insulation structure and cylindrical battery

Abstract

The application relates to the field of batteries, in particular to a battery insulation structure and a cylindrical battery. The battery insulation structure is arranged at the side of a pole group, the insulation body is provided with an opening, the opening comprises an assembly hole; a partition is arranged in the assembly hole and divides the assembly hole into two regions of a penetrating region and a mounting region, a tab is bent and fixed in the mounting region after penetrating the insulation body through the penetrating region, so that at least part of the tab is arranged on the side of the partition away from the pole group. The battery insulation structure can position and support the tab, the relative position of the tab after being bent and the battery insulation structure is fixed, the risk of tab reverse insertion and extrusion is reduced, the tab can be accurately mounted in the shell, the tab is prevented from being scratched, and therefore the assembly yield and production efficiency of the cylindrical battery are improved.

Description

Technical Field

[0001] This invention relates to the field of batteries, and in particular to a battery insulation structure and a cylindrical battery. Background Technology

[0002] Cylindrical batteries consist of a casing, electrode assembly, and cap. Insulating sheets are mounted on the electrode assembly, and tabs are located on both sides of the assembly. One tab extends from the electrode assembly, passes through the insulating sheet, and connects to the cap; the other tab extends from the electrode assembly, passes through another insulating sheet, and connects to the casing. Currently, the insulating sheets are annular in shape, which makes it easy for the tabs to be inserted incorrectly or squeezed during the assembly of the insulating sheets and electrode assembly in cylindrical batteries. This makes the tabs easily scratched, thus affecting the assembly yield and efficiency of the cylindrical battery. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a battery insulation structure and a cylindrical battery to solve the problem that in the existing process of assembling insulating sheets and electrode groups, the tabs are easily inserted in reverse and squeezed, which makes the tabs easy to be scratched, thereby affecting the assembly yield and efficiency of cylindrical batteries.

[0004] A first aspect of the present invention provides a battery insulation structure, wherein the battery insulation structure is disposed on the side of an electrode assembly, the battery insulation structure comprising: An insulating body is provided with an opening, the opening including an assembly hole; A separator is disposed within the mounting hole, dividing the mounting hole into two areas: a penetration area and an installation area. The electrode tab passes through the insulating body via the penetration area and is then bent and fixed within the installation area, such that after the electrode tab is installed, at least a portion of the electrode tab is disposed on the side of the separator facing away from the electrode assembly.

[0005] Preferably, the area of ​​the penetration area is smaller than the area of ​​the installation area; And / or, the electrode tab is a negative electrode tab.

[0006] Preferably, the assembly hole is formed as a strip-shaped hole extending along a first direction, and the separator is formed as a rod-shaped structure extending along a second direction, wherein the first direction is perpendicular to the second direction.

[0007] Preferably, the dimension of the penetration area in the first direction is L1, where 0.5mm≤L1≤0.8mm.

[0008] Preferably, the dimension of the mounting area in the second direction is L2, in mm; 0.1mm ≤ L2 - the width dimension of the electrode tab in the second direction ≤ 0.2mm.

[0009] Preferably, the surface of the insulating body facing the electrode group is a first surface, and the surface of the insulating body facing away from the electrode group is a second surface; the dimension of the separator in the thickness direction of the insulating body is smaller than the thickness dimension of the insulating body, and the surface of the separator facing the electrode group and the first surface are coplanar.

[0010] Preferably, in the thickness direction of the insulating body, the distance between the surface of the separator facing away from the pole group and the second surface is h, where 0.2mm≤h≤0.5mm.

[0011] Preferably, the opening further includes multiple connecting holes, which surround the assembly hole and are spaced apart from each other.

[0012] Preferably, the radial dimension of the insulating body is D, in mm; the area of ​​the battery insulation structure projected onto a plane parallel to the insulating body is S1, in mm. 2 The area enclosed by the circumferential outer edge of the insulating body is S2, in mm. 2 ;π×(D / 2) 2 ×10%≤S2-S1≤π×(D / 2) 2 ×15%.

[0013] A second aspect of the present invention provides a cylindrical battery comprising the battery insulation structure described in any of the above technical solutions.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The battery insulation structure of the present invention is disposed on the side of the electrode assembly. The insulation body is provided with an opening, including an assembly hole. A separator is disposed in the assembly hole, dividing the assembly hole into two areas: a through-hole area and an installation area. The electrode tab passes through the insulation body via the through-hole area and is bent and fixed in the installation area. After the electrode tab is installed, at least part of the electrode tab is disposed on the side of the separator facing away from the electrode assembly. This allows the battery insulation structure to position and support the electrode tab, fixing the relative position of the electrode tab with the battery insulation structure after bending. This reduces the risk of electrode tab being inserted backwards or squeezed, and enables the electrode tab to be accurately installed inside the casing, preventing the electrode tab from being scratched. This improves the assembly yield and production efficiency of cylindrical batteries.

[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery insulation structure provided in an embodiment of the present invention; Figure 2 A schematic diagram of the battery insulation structure provided in an embodiment of the present invention from another perspective; Figure 3 for Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the battery insulation structure provided in an embodiment of the present invention from another perspective. Figure 5 For along Figure 4 Cross-sectional view taken at point BB in the middle; Figure 6 This is a schematic diagram of the battery insulation structure and electrode assembly provided in an embodiment of the present invention; Figure 7 This is a cross-sectional view of the battery insulation structure and electrode assembly provided in an embodiment of the present invention; Figure 8 for Figure 7 A magnified structural diagram at point C.

[0018] Icons: 10-Insulating body; 11-Assembly hole; 111-Throughing area; 112-Mounting area; 12-Connecting hole; 101-First surface; 102-Second surface; 20-Separator; 30-Pole group; 31-Pole tab; 40-Battery cap; D1-First direction; D2-Second direction. Detailed Implementation

[0019] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0020] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0021] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0022] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0023] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0024] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that 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 relation terms used herein will be interpreted accordingly.

[0025] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0026] Variations in the shapes shown in the accompanying 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 accompanying drawings, but include changes in shape that may occur during manufacturing.

[0027] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0028] According to a first aspect of the present invention, a battery insulation structure is provided, which includes an insulation body 10 and a separator 20.

[0029] The specific structure of the battery insulation structure according to this embodiment, as described above, will be described below.

[0030] In this embodiment, as Figures 6 to 8 As shown, the electrode assembly 30 of the cylindrical battery is generally formed into a cylindrical structure. The electrode assembly 30 is installed inside the housing, and a battery cap 40 is provided on the open side of the housing, which closes the opening of the housing. The battery insulation structure is provided on the side of the electrode assembly 30 where the tabs 31 are provided, for example, on the side of the electrode assembly 30 in the axial direction; specifically, as shown... Figure 7 As shown, in this embodiment, the battery insulation structure is installed on the side of the electrode group 30 facing away from the battery cap 40 in the axial direction.

[0031] like Figures 1 to 8 As shown, the insulating body 10 is formed as a sheet-like structure or a plate-like structure, such as a circular sheet-like structure or a plate-like structure. The insulating body 10 is provided with an opening, which is a through hole that penetrates the insulating body 10 along the battery axis. Specifically, the opening includes an assembly hole 11 for mounting the tab 31.

[0032] like Figures 1 to 5As shown, the separator 20 is disposed within the mounting hole 11 to divide the mounting hole 11 into two areas: a through-hole area 111 and a mounting area 112. Preferably, the separator 20 is integrally formed with the insulating body 10 to save assembly steps. Specifically, the separator 20 is bent on the side facing the mounting area 112 to achieve effective forming. In other alternative embodiments, the separator 20 and the insulating body 10 can also be formed as separate structures and then assembled by snap-fit ​​or other methods. This allows adjustment of the position of the separator 20 in the mounting hole 11 to accommodate tabs 31 of different sizes.

[0033] Specifically, such as Figures 1 to 8 As shown, the through-hole area 111 corresponds to the position of the electrode lug 31 on the electrode assembly 30. The through-hole area 111 is a through-hole structure, as shown in the figure. Figure 8 As shown, the tab 31 passes through the through-hole area 111, passes through the insulating body 10, and is then bent and fixed in the mounting area 112. After installation, the root of the tab 31 that connects to the electrode group 30 is located in the through-hole area 111. At least a portion of the tab 31 is located on the side of the separator 20 facing away from the electrode group 30. This allows the battery insulation structure to position and support the tab 31, fixing the relative position of the tab 31 to the battery insulation structure after bending. This reduces the risk of the tab 31 being inserted backwards or squeezed, ensuring that the tab 31 is accurately installed inside the casing and preventing scratches on the tab 31. This improves the assembly yield and production efficiency of the cylindrical battery.

[0034] It should be noted that, compared with the traditional annular insulating sheet, the tab 31 in this embodiment is installed in the assembly hole 11. The assembly hole 11 can limit the installation position of the tab 31, so that the position of the tab 31 in the battery insulation structure is determined, thereby improving the subsequent welding yield.

[0035] like Figures 1 to 4 and Figure 8 As shown, the area of ​​the through area 111 is smaller than the area of ​​the mounting area 112, so that the separator 20 can be set close to the root of the tab 31 connected to the electrode group 30. While satisfying the requirement that the mounting area 112 accommodates the tab 31, it improves the support effect of the battery insulation structure on the positioning of the tab 31, and further improves the assembly yield and production efficiency of the cylindrical battery.

[0036] In this embodiment, as Figure 6 and Figure 7 As shown, the tab 31 that mates with the mounting hole 11 is the negative tab, meaning that the battery insulation structure is installed on the negative side of the electrode group 30, and the positive tab is connected to the battery cap 40.

[0037] In this embodiment, as Figures 1 to 5As shown, the mounting hole 11 is formed as a strip-shaped hole extending along the first direction D1, such as a rectangular strip-shaped hole. However, the shape of the mounting hole 11 is not limited to this; it can also be formed as an elongated strip-shaped hole structure combining elliptical, rectangular, and semi-circular shapes, as long as it meets the installation requirements of the tab 31. Figures 1 to 4 As shown, the separator 20 is formed as a rod-shaped structure extending along the second direction D2. Preferably, the two ends of the separator 20 in the length direction are connected to the hole wall of the assembly hole 11, thereby improving the positioning and support reliability of the separator 20 for the tab 31.

[0038] It should be noted that the first direction D1 is perpendicular to the second direction D2. The first direction D1 and the second direction D2 can be the radial direction of the battery, that is, the first direction D1 and the second direction D2 are perpendicular to the axial direction of the battery respectively.

[0039] Furthermore, such as Figure 1 As shown, the dimension of the through area 111 in the first direction D1 is L1, 0.5mm≤L1≤0.8mm. In this way, while ensuring that the separator 20 can play a certain role in positioning and supporting the electrode 31, it is convenient for the electrode 31 to pass through the through area 111 and for the electrode 31 to bend into the installation area 112.

[0040] Furthermore, such as Figure 1 As shown, the dimension of the mounting area 112 in the second direction D2 is L2, in mm; 0.1mm≤L2 - width dimension of the tab 31 in the second direction D2≤0.2mm, that is, the difference between L2 and the width dimension of the tab 31 in the second direction D2 is 0.1mm to 0.2mm. This ensures that there is a gap between the edge of the tab 31 in the second direction D2 and the side wall of the mounting area 112 in the second direction D2, so that the tab 31 can be smoothly installed in the mounting area 112.

[0041] like Figures 1 to 5 and Figure 8 As shown, the surface of the insulating body 10 facing the electrode group 30 is the first surface 101, and the surface of the insulating body 10 facing away from the electrode group 30 is the second surface 102. That is, the two surfaces of the insulating body 10 in its thickness direction are respectively formed as the first surface 101 and the second surface 102. The dimension of the separator 20 in the thickness direction of the insulating body 10 is smaller than the thickness dimension of the insulating body 10. The surface of the separator 20 facing the electrode group 30 and the first surface 101 are coplanar, so that the surface of the separator 20 facing away from the electrode group 30 is set inside the assembly hole 11. This leaves a certain space for the bent electrode tab 31 and further reduces the risk of scratching the electrode tab 31.

[0042] Furthermore, such as Figure 3As shown, in the thickness direction of the insulating body 10, the distance between the surface of the separator 20 facing away from the pole group 30 and the second surface 102 is h, 0.2mm≤h≤0.5mm. This ensures that the structural strength of the separator 20 can meet the support and positioning requirements, and also facilitates the bending of the pole tab 31 into the installation area 112.

[0043] In this embodiment, as Figure 1 , Figure 2 , Figures 4 to 8 As shown, the opening also includes multiple connecting holes 12. These multiple connecting holes 12 surround the assembly hole 11 and are spaced apart from each other, thus meeting the requirement for fluid to pass through, such as the requirement for electrolyte to pass through the connecting holes 12. The connecting holes 12 can be circular, polygonal, or other shapes. The size or shape of the multiple connecting holes 12 can be the same or different, depending on the actual requirements.

[0044] In a preferred embodiment, such as Figures 1 to 4 As shown, the radial dimension of the insulating body 10 in the battery is D, in mm; the area of ​​the battery insulation structure projected onto a plane parallel to the insulating body 10 is S1, in mm. 2 S1 is the sum of the area of ​​the insulating body 10 after removing the mounting hole 11 and the connecting hole 12 and the area of ​​the separator 20; S2 is the area of ​​the region enclosed by the circumferential outer edge of the insulating body 10. The units are mm. 2 That is, the area of ​​the insulating body 10 before the opening is S2; π×(D / 2) 2 ×10%≤S2-S1≤π×(D / 2) 2 ×15% ensures that the electrolyte can fully wet the cells and that the tabs 31 have sufficient insulating area, thus achieving reliable insulation protection of the battery insulation structure within the cylindrical battery.

[0045] The following measures the width dimensions of the tab 31 in the second direction D2 for the conditions 0.5mm≤L1≤0.8mm, 0.1mm≤L2, 0.2mm≤h≤0.5mm, and π×(D / 2). 2 ×10%≤S2-S1≤π×(D / 2) 2 Multiple tests were conducted to assess the reliability within a 15% limit range. Specific test results are shown in Table 1. In the table, the units for D, the width of tab 31 in the second direction D2, L1, L2, and h are all in mm. The units for S2-S1 are also in mm. 2 .

[0046] Table 1

[0047] According to the present invention, a battery insulation structure is disposed on the side of the electrode assembly 30. The insulation body 10 is provided with an opening, including an assembly hole 11. A separator 20 is disposed in the assembly hole 11, dividing the assembly hole 11 into two areas: a through-hole area 111 and an installation area 112. The tab 31 passes through the insulation body 10 via the through-hole area 111 and is bent and fixed in the installation area 112. After the tab 31 is installed, at least a portion of the tab 31 is disposed on the side of the separator 20 facing away from the electrode assembly 30. This allows the battery insulation structure to position and support the tab 31, fixing the relative position of the tab 31 to the battery insulation structure after bending. This reduces the risk of the tab 31 being inserted backwards or squeezed, ensuring that the tab 31 is accurately installed inside the casing and preventing scratches on the tab 31. This improves the assembly yield and production efficiency of cylindrical batteries.

[0048] The cylindrical battery provided by the present invention includes the battery insulation structure as described above, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0049] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A battery insulation structure, characterized in that, The battery insulation structure is disposed on the side of the electrode assembly, and the battery insulation structure includes: An insulating body is provided with an opening, the opening including an assembly hole; A separator is disposed within the mounting hole, dividing the mounting hole into two areas: a penetration area and an installation area. The electrode tab passes through the insulating body via the penetration area and is then bent and fixed within the installation area, such that after the electrode tab is installed, at least a portion of the electrode tab is disposed on the side of the separator facing away from the electrode assembly.

2. The battery insulation structure according to claim 1, characterized in that, The area of ​​the penetration area is smaller than the area of ​​the installation area; And / or, the electrode tab is a negative electrode tab.

3. The battery insulation structure according to claim 1, characterized in that, The assembly hole is formed as a strip-shaped hole extending along a first direction, and the separator is formed as a rod-shaped structure extending along a second direction, with the first direction perpendicular to the second direction.

4. The battery insulation structure according to claim 1, characterized in that, The dimension of the penetration area in the first direction is L1, where 0.5mm≤L1≤0.8mm.

5. The battery insulation structure according to claim 1, characterized in that, The dimension of the mounting area in the second direction is L2, in mm; 0.1mm ≤ L2 - the width dimension of the electrode tab in the second direction ≤ 0.2mm.

6. The battery insulation structure according to claim 1, characterized in that, The surface of the insulating body facing the electrode group is the first surface, and the surface of the insulating body facing away from the electrode group is the second surface; the dimension of the separator in the thickness direction of the insulating body is smaller than the thickness dimension of the insulating body, and the surface of the separator facing the electrode group and the first surface are coplanar.

7. The battery insulation structure according to claim 6, characterized in that, In the thickness direction of the insulating body, the distance between the surface of the separator facing away from the pole group and the second surface is h, where 0.2mm≤h≤0.5mm.

8. The battery insulation structure according to claim 1, characterized in that, The opening also includes multiple connecting holes, which surround the assembly hole and are spaced apart from each other.

9. The battery insulation structure according to claim 1, characterized in that, The radial dimension of the insulating body is D, in mm; the area of ​​the battery insulation structure projected onto a plane parallel to the insulating body is S1, in mm. 2 The area enclosed by the circumferential outer edge of the insulating body is S2, in mm. 2 ;π×(D / 2) 2 ×10%≤S2-S1≤π×(D / 2) 2 ×15%.

10. A cylindrical battery, characterized in that, The battery insulation structure includes any one of claims 1 to 9.

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