Insulator, secondary battery, and electronic device

Abstract

The utility model provides an insulator, a secondary battery and an electronic device, the insulator comprises a disc body and a plurality of first sinking platforms, the disc body is annular, the excircle radius of the disc body is R, and the radial unilateral width of the disc body is L; the plurality of first sinking tables are arranged on the large surface of the disc body and are positioned in a circular ring-shaped area which takes the center of the disc body as the center; the radius of the inner circle of the annular area is R-L / 2-4 mm, the radius of the outer circle of the annular area is R-L / 2 + 4 mm, and the projection area of the single first sinking table on the large face of the disc body is 0.07-50 mm < 2 >. Wherein the unit of R and L is mm, and R > L > 8mm. According to the insulating part, the technical problem that the warping amount of the existing insulating part is too large can be solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to an insulating component, a secondary battery, and an electronic device. Background Technology

[0002] Insulators are often provided between the end wall of a secondary battery and the electrode assembly, or between the end wall and the current collector. These insulators are used to achieve insulation between the end wall and the electrode assembly, or between the end wall and the current collector. Existing insulators are mostly formed by injection molding, which results in excessive warpage of the finished product, leading to product defects. Therefore, there is a need to provide a new type of insulator, secondary battery, and electronic device. Utility Model Content

[0003] This invention provides an insulating component, a secondary battery, and an electronic device to improve the technical problem of excessive warpage in existing insulating components.

[0004] To achieve the above and other related objectives, a first aspect of this utility model is to provide an insulating component, comprising a disc body and a plurality of first recessed platforms. The disc body is annular, with an outer radius of R and a radial width of L on one side. The plurality of first recessed platforms are disposed on the large surface of the disc body and located within an annular region centered on the center of the disc body. The inner radius of the annular region is RL / 2-4mm, the outer radius is RL / 2+4mm, and the projected area of ​​a single first recessed platform on the large surface of the disc body is 0.07-50mm². 2 Where R and L are in mm, and R > L > 8 mm.

[0005] In one example of the insulating component of this utility model, the thickness of the disc body is 0.4 to 1.2 mm, and the recess depth of the first recessed platform is 0.01 to 0.4 mm.

[0006] In one example of the insulating component of this utility model, the disc body includes a plurality of first reinforcing rib groups, which are evenly arranged in a circumference around the center of the disc body. The large surface area of ​​the disc body is S, and the projected area of ​​the first reinforcing rib group on the large surface is S1, wherein the ratio of S1 to S is 20% to 70%.

[0007] In one example of the insulating component of this utility model, the disc body includes multiple first reinforcing rib groups and multiple second reinforcing rib groups. The multiple first reinforcing rib groups are arranged in a uniform array around the center of the disc body along the circumference. The multiple second reinforcing rib groups surround the outer periphery of the first reinforcing rib groups and are also arranged in a uniform array around the center of the disc body along the circumference. The large surface area of ​​the disc body is S, and the sum of the projected areas of the first reinforcing rib groups and the second reinforcing rib groups on the large surface is S2, wherein the ratio of S2 to S is 20% to 70%.

[0008] In one example of the insulating component of this utility model, at least a portion of the first recessed platform is provided with a second recessed platform. The projection of the second recessed platform on the large surface is circular and it is coaxially arranged with the first recessed platform. The depth of the second recessed platform is 0.01 to 0.2 mm, and the diameter of the second recessed platform is 0.3 to 4 mm.

[0009] In one example of the insulating component of this utility model, the number of the first recessed platforms is 2 to 4, and the multiple first recessed platforms are evenly distributed around the center of the disk body along the circumference.

[0010] In one example of the insulating component of this utility model, the first recessed platform and / or the second recessed platform are circular, the diameter of the first recessed platform is in the range of 0.3 to 8 mm, and the diameter of the second recessed platform is in the range of 0.3 to 4 mm; the difference in distance between any two first recessed platforms and the center of the disk body is ≤5 mm; and / or, the difference in distance between any two second recessed platforms and the center of the disk body is ≤5 mm.

[0011] In one example of the insulating component of this utility model, the first recessed platform is either circular or square, the second recessed platform is located inside the first recessed platform and its shape corresponds to the first recessed platform, and the included angle formed between the lines connecting any adjacent centers of the first recessed platform and the center of the disk body is ≤90°; and / or, the included angle formed between the lines connecting any adjacent centers of the second recessed platform and the center of the disk body is ≤90°.

[0012] In one example of the insulating component of this utility model, at least a portion of the second recessed platform is provided with an injection port mark.

[0013] In one example of the insulating component of this utility model, at least a portion of the first recessed platform is provided with an injection port mark.

[0014] A second aspect of this utility model is to provide a secondary battery, the secondary battery comprising the insulating element described in any of the preceding claims.

[0015] A third aspect of this invention is to provide an electronic device comprising the secondary battery described in any of the preceding claims.

[0016] This utility model relates to an insulating component where the injection port is located within a first recessed platform. Since the first recessed platform is situated in the radial center of the disk body, it not only enables faster injection speeds during the injection molding process but also shortens the time difference for the adhesive to fill both ends radially. This results in a more uniform temperature distribution, reducing warping caused by uneven temperature during cooling and improving the molding quality and consistency of the insulating component. Furthermore, the recessed platform can accommodate any protruding injection port marks, preventing them from protruding from the disk surface and being scraped into the secondary battery, thus improving the safety of the secondary battery. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an example of the secondary battery of this utility model;

[0019] Figure 2 This is a schematic diagram of the electrode assembly structure in an example of the secondary battery of this utility model;

[0020] Figure 3 for Figure 1 A partial enlarged view of the electrode end in an example of a secondary battery of this utility model;

[0021] Figure 4 This is a top view of one embodiment of the secondary battery insulating component of this utility model;

[0022] Figure 5 for Figure 4 Sectional view of AA;

[0023] Figure 6 for Figure 5 A magnified view of a portion of region C in the middle;

[0024] Figure 7 This is a top view of another example of the insulating component of this utility model;

[0025] Figure 8 for Figure 7 A partial sectional view showing the locations of the first and second sinkholes.

[0026] Figure 9 This is a top view of another example of the insulating component of this utility model;

[0027] Figure 10This is a top view of another example of the insulating component of this utility model;

[0028] Figure 11 This is a bottom view of another example of the insulating component of this utility model;

[0029] Figure 12 for Figure 11 A cross-sectional view along the MM direction;

[0030] Figure 13 This is a bottom view of another example of the insulating component of this utility model;

[0031] Figure 14 For Figure 13 A cross-sectional view along the NN direction;

[0032] Figure 15 For Figure 14 A magnified view of a portion of region G in the middle;

[0033] Figure 16 This is a schematic diagram of an example of the battery pack of this utility model;

[0034] Figure 17 This is a schematic diagram of an example of the electronic device of this utility model.

[0035] Component designation explanation:

[0036] 1. Electronic device; 10. Battery pack; 11. Working part; 101. Housing; 102. Housing cover; 100. Secondary battery; 110. Housing; 111. End wall; 1111. Terminal hole; 112. Side wall; 113. Opening; 120. Electrode assembly; 121. Positive electrode; 1211. Positive current collector; 1212. First coated area; 1213. First uncoated area; 122. Separator; 123. Negative electrode; 1231. Negative current collector; 1232. Second coated area; 1233. 124. Uncoated area; 125. Negative electrode tab; 130. Positive electrode tab; 140. Cover plate; 141. Electrode post; 142. Inner flange; 143. Columnar part; 144. Outer flange; 150. Seal; 170. Top plastic; 180. Current collector; 190. Insulator; 191. Disc; 1911. Annular area; 192. First recessed platform; 193. Second recessed platform; 194. Injection port mark; 195. Boss; 196. First reinforcing rib group; 197. Second reinforcing rib group; 198. Center hole. Detailed Implementation

[0037] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0038] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0039] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0040] Please see Figures 1 to 17 This utility model provides an insulating component, a secondary battery, and an electronic device. The insulating component, through a special structural design, can reduce warping caused by uneven temperature during cooling and prevent the glue injection port print from protruding from the disk surface and being scraped into the secondary battery, thereby improving the safety of the secondary battery.

[0041] Please see Figure 1 and Figure 3 The first aspect of this utility model is to provide an insulating member 190, which is used to be disposed between the end wall 111 of the housing and the electrode assembly 120 (when there is no current collector 180), or installed between the end wall 111 and the current collector 180, so that the two are relatively insulated.

[0042] Please see Figures 4 to 6The insulating element 190 includes a disc body 191 and a plurality of first sinkers 192. The disk body 191 is annular, with an outer radius of R and a radial width of L (i.e., the radial distance from the outer edge of the disk body 191 to the outer wall of the inner peripheral protrusion; in other embodiments, the inner periphery of the insulating member 190 may not have a protrusion, in which case L is the radial distance from the outer edge of the disk body to the inner wall of the central hole 198 of the insulating member). Multiple first recessed platforms 192 are disposed on the large surface of the disk body 191 and located within an annular region 1911 centered on the center of the disk body 191. The inner radius of the annular region 1911 is RL / 2-4mm, and the outer radius is RL / 2+4mm. The shape of the first recessed platforms is not limited; their projection on the large surface can be circular, rectangular, square, racetrack-shaped, or other irregular contours, as long as the projected area of ​​a single first recessed platform 192 on the large surface of the disk body 191 is 0.07-50mm². 2 That is, R and L are in mm, and R > L > 8 mm. For example, when R is 15 mm and L is 10 mm, the inner radius of the annular region 1911 is RL / 2 - 4 mm = 15 - 10 / 2 - 4 = 6 mm, and the outer radius is RL / 2 + 4 mm = 15 - 10 / 2 + 4 = 14 mm. The projected area of ​​a single first recessed platform 192 on the large surface of the disk 191 is 0.07 to 50 mm². 2 For example, it can be 0.07mm. 2 25mm 2 Or 50mm 2 This design allows the injection port to be positioned within the first recess 192. Since the first recess 192 is located in the radial center of the disc 191, it not only enables faster injection speeds during molding but also shortens the time difference for the adhesive to fill both ends radially. The temperature distribution is relatively uniform, reducing warping of the insulating component 190 due to uneven temperature during cooling, thus improving the molding quality and consistency of the insulating component 190. Furthermore, by matching the first recess 192 with the injection port, the first recess 192 can accommodate any protruding injection port mark 194, preventing the injection port mark 194 from protruding from the surface of the disc 191 and being scraped into the secondary battery 100, thereby improving the safety of the secondary battery 100.

[0043] Please see Figure 5 and Figure 6In one example of the insulating component 190 of this utility model, the thickness T of the disc body 191 is 0.4 to 1.2 mm, for example, 0.4 mm, 0.8 mm, or 1.2 mm. The recess depth B of the first recessed platform 192 is 0.01 to 0.4 mm, for example, 0.01 mm, 0.2 mm, or 0.4 mm. By controlling the thickness of the disc body 191 and the recess depth of the first recessed platform 192 within the above ranges, not only can the insulation performance of the insulating component 190 be guaranteed, but also a faster injection speed can be achieved during the injection molding process. At the same time, uniform temperature distribution is ensured, and warping caused by excessive thickness gradient during the cooling process of the insulating component 190 is reduced, thereby improving the flatness and dimensional stability of the insulating component 190.

[0044] Please see Figures 7 to 8 In one example of the insulating component 190 of this utility model, a second recessed platform 193 is provided within at least a portion of the first recessed platform 192. The projections of the first recessed platform 192 and the second recessed platform 193 on the large surface are circular, and the second recessed platform 193 is coaxially arranged with the first recessed platform 192. The depth F of the second recessed platform 193 is 0.01 to 0.2 mm, for example, 0.01 mm, 0.1 mm, or 0.2 mm. The diameter D2 of the second recessed platform 193 is 0.3 to 4 mm, for example, 0.3 mm, 2.15 mm, or 4 mm. This design enables a faster injection speed during injection molding while ensuring uniform temperature distribution. This design can form local cooling channels during injection molding, reducing warping caused by excessively high local temperatures, and improving the flatness and dimensional stability of the insulating component 190.

[0045] In one example of the insulating component 190 of this utility model, the number of first recessed platforms 192 is one or more. Preferably, the number of first recessed platforms 192 in this utility model is 2 to 4, for example, 2, 3, or 4. Multiple first recessed platforms 192 are evenly distributed around the center of the disc body 191 along the circumference. This design enables faster injection speeds during injection molding while ensuring uniform temperature distribution. The evenly distributed platforms can connect to multiple injection ports, accelerating the uniformity of plastic flow and reducing warping caused by uneven flow.

[0046] In one example of the insulating component 190 of this utility model, the first recess 192 and / or the second recess 193 are circular. The diameter D1 of the first recess 192 is 0.3 to 8 mm, for example, 0.3 mm, 4.15 mm, or 8 mm. The diameter D2 of the second recess 193 is 0.3 to 4 mm, for example, 0.3 mm, 2.15 mm, or 4 mm. The difference in distance between any two first recesses 192 and the center of the disc 191 is ≤5 mm, for example, 0 mm, 2.5 mm, or 5 mm. The difference in distance between any two second recesses 193 and the center of the disc 191 can also be 0 mm, 2.5 mm, or 5 mm. This design enables faster injection speeds during injection molding while ensuring uniform temperature distribution. This design forms a uniform cooling path during injection molding, reducing warping caused by local temperature differences and improving the flatness and dimensional stability of the insulating component 190.

[0047] Please see Figure 4 In one example of the insulating component 190 of this utility model, the first recessed platform 192 is circular. Please refer to [link / reference]. Figure 9 In another example, the first recessed platform 192 is square. The second recessed platform 193 is located within the first recessed platform 192, and its shape may or may not correspond to the first recessed platform 192. See also... Figure 9 In one example, the first recessed platform 192 is square, and the second recessed platform 193 is circular. Please refer to [link / reference]. Figure 10 In another example, the first recess 192 is square, and the second recess 193 is also square, corresponding to the first recess 192. The angle formed between the lines connecting the centers of any adjacent first recess 192 and the center of the disc 191 is ≤90°, for example, it can be 0°, 45°, or 90°. Similarly, the angle formed between the lines connecting the centers of any adjacent second recess 193 and the center of the disc 191 can also be 0°, 45°, or 90°. This design enables faster injection speeds during injection molding while ensuring uniform temperature distribution. This design also creates a uniform filling path during injection molding, reducing warping caused by localized temperature differences and improving the flatness and dimensional stability of the insulating part 190.

[0048] Please see Figure 8 In one example of the insulating component 190 of this utility model, at least a portion of the second recessed platform 193 has an injection port mark 194 formed therein. When the injection port is located within the second recessed platform 193, the remaining injection port mark will be confined within the recessed area of ​​the platform, thereby preventing the injection port mark from being scratched and falling into the secondary battery 100.

[0049] Please see Figure 6In one example of the insulating component 190 of this utility model, the first recessed platform 192 does not have a second recessed platform 193, and at least a portion of the first recessed platform 192 has an injection port mark 194. By using the first recessed platform as the access position for the injection port, the residual injection port mark can be stored in the corresponding recessed platform. The residual injection port mark will be confined within the recessed area of ​​the platform, thereby preventing the injection port mark from falling into the secondary battery 100 after being scratched.

[0050] Please see Figures 11 to 12 In one example of the insulating component 190 of this utility model, the side of the disc body 191 opposite to the end wall 111 includes a plurality of first reinforcing rib groups 196. These first reinforcing rib groups 196 are evenly arranged in an array around the center of the disc body 191. Each first reinforcing rib group 196 includes multiple reinforcing ribs, which are interconnected to form a mesh structure. The large surface area of ​​the disc body 191 is S, and the sum of the projected areas of all the reinforcing ribs in the first reinforcing rib groups 196 on the large surface is S1. The ratio of S1 to S is 20% to 70%. For example, when S is 100 mm... 2 At this time, S1 can be 20mm. 2 45mm 2 Or 70mm 2 This design not only strengthens the disc 191 through reinforcing ribs, effectively dispersing stress during injection molding and reducing warping of the insulating component 190 due to stress concentration during cooling, thus improving the structural strength and dimensional stability of the insulating component 190 to prevent warping of the disc 191, but also increases the area of ​​the flow channel by the first reinforcing rib group 196, which is conducive to achieving rapid filling of the peripheral area.

[0051] Please see Figures 13 to 15 In one example of the insulating component 190 of this utility model, the disc body 191 includes multiple first reinforcing rib groups 196 and multiple second reinforcing rib groups 197. The first reinforcing rib groups 196 are arranged in an array with the center of the disc body 191 as the center, and the second reinforcing rib groups 197 surround the outer periphery of the first reinforcing rib groups 196 and are evenly arranged in an array along the circumference with the center of the disc body 191 as the center. Both the first reinforcing rib groups 196 and the second reinforcing rib groups 197 include multiple reinforcing ribs. The reinforcing ribs in the multiple first reinforcing rib groups 196 and the reinforcing ribs in the multiple second reinforcing rib groups 197 are interconnected to form a mesh structure, and the bottom wall of each reinforcing rib protrudes from the lower surface of the disc body 191. The distance P from the bottom of the reinforcing rib to the upper surface is greater than the distance Q from the lower surface to the upper surface of the disc body. The large surface area of ​​the disc body 191 is S, and the sum of the projected areas of all the reinforcing ribs in the first reinforcing rib groups 196 and all the reinforcing ribs in the second reinforcing rib groups 197 on the large surface is S2, where the ratio of S2 to S is 20% to 70%. For example, when S is 100mm2 At this time, S2 can be 20mm. 2 45mm 2 Or 70mm 2 It enables faster injection speeds during the injection molding process while ensuring uniform temperature distribution. The double-layer reinforcing rib design further disperses stress during injection molding, reduces warping of the insulating part 190 due to stress concentration during cooling, and significantly improves the structural strength and dimensional stability of the insulating part 190.

[0052] Please see Figures 1 to 3 This utility model provides a secondary battery 100, which, in addition to the insulating component described in any of the above embodiments, typically includes a housing 110, an electrode assembly 120, a terminal post 140, and a sealing component 150.

[0053] Please see Figure 1 The housing 110 includes an end wall 111 and a side wall 112 surrounding the end wall 111. As long as a stable sealing and electrical connection can be formed, the connection between the end wall 111 and the side wall 112 can be achieved in various ways, such as integral stamping, integral casting, or separate welding. The circumference of the side wall 112 is not limited; it can be cylindrical or prismatic, or it can follow any other closed-loop contour that matches the end wall 111. In this embodiment, the outer edge of the end wall 111 is circular, and the side wall 112 is cylindrical, surrounding the outer edge of the end wall 111, with a circular opening 113 formed at the end of the side wall 112 facing away from the end wall 111. A receiving cavity is formed within the housing 110 formed by the end wall 111 and the side wall 112 to accommodate the electrode assembly 120, electrolyte, and other necessary battery components. Specifically, the diameter of the housing 110 can be determined according to the specific size of the electrode assembly 120, such as 18mm, 21mm, or 46mm. The shell 110 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. In order to prevent the shell 110 from rusting during long-term use, a layer of anti-rust material such as metallic nickel can be plated on the surface of the shell 110.

[0054] Please see Figures 1 to 2 The electrode assembly 120 is disposed inside the housing 110 and is a component in the secondary battery 100 where electrochemical reactions occur. The housing 110 may contain one or more electrode assemblies 120. The electrode assembly 120 includes an electrode sheet and a separator 122, which are wound to form a wound structure. Specifically, in this embodiment, the electrode assembly 120 includes a positive electrode sheet 121, a separator 122, and a negative electrode sheet 123 wound axially around the housing 110.

[0055] Please see Figures 1 to 2The positive electrode 121 includes a positive current collector 1211 and a positive active material layer coated on the positive current collector 1211. A first coated area 1212 coated with the positive active material layer and a first uncoated area 1213 uncoated with the positive active material layer are formed on the positive current collector 1211. The first coated area 1212 and the first uncoated area 1213 are arranged along the axial direction of the housing 110. The first uncoated area 1213 extends to one end of the secondary battery 100 in the height direction to the outside of the separator 122 and is bent towards the axis of the housing 110 to form a stacked positive electrode tab 125.

[0056] Please see Figures 1 to 2 The negative electrode 123 includes a negative current collector 1231 and a negative active material layer coated on the negative current collector 1231. A second coated area 1232 coated with the negative active material layer and a second uncoated area 1233 uncoated with the negative active material layer are formed on the negative current collector 1231. The second coated area 1232 and the second uncoated area 1233 are arranged along the axial direction of the housing 110. The second uncoated area 1233 extends to the other end of the secondary battery 100 in the height direction to the outside of the separator 122 and is bent towards the axis of the housing 110 to form a stacked negative electrode tab 124.

[0057] Please see Figures 1 to 2 A separator 122 is disposed between the positive electrode 121 and the negative electrode 123 to isolate the positive and negative active material layers. Taking a lithium-ion secondary battery 100 as an example, the positive current collector 1211 can be made of aluminum, and the positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative current collector 1231 can be made of copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The substrate material of the separator 122 can be polypropylene (PP) or polyethylene (PE), etc. To protect and insulate the battery cell, an insulating film can also be wrapped around the outside of the battery cell. The insulating film can be synthesized from PP, PE, polyethylene terephthalate (PET), polyvinyl chloride (PVC), or other polymer materials.

[0058] Please see Figure 1 and Figure 2Furthermore, in this invention, the positive electrode tab 125 faces the end wall 111 or the opening 113, while the negative electrode tab 124 faces the other end of the housing 110. In this embodiment, the positive electrode tab 125 faces the end wall 111 and is electrically connected to the terminal post 140, making the terminal post 140 positively charged. The negative electrode tab 124 faces the opening 113, and the housing 110 is electrically connected to the negative electrode tab 124, thus becoming negatively charged. However, in another embodiment, the negative electrode tab 124 can be connected to the terminal post 140, and the positive electrode tab 125 can be connected to the housing 110.

[0059] Please see Figure 1 The cover plate 130 is sealed and installed on the opening 113. The outer edge shape of the cover plate 130 corresponds to the shape of the opening 113 and is connected to the side wall 112 to seal the opening 113. The installation method of the cover plate 130 includes, but is not limited to, mechanical sealing or welding sealing. In this embodiment, the cover plate 130 is sealed and plugged on the opening 113 by means of mechanical sealing.

[0060] Please see Figures 1 to 3 The end wall 111 is provided with a pole post hole 1111, and the pole post 140 is installed through the pole post hole 1111 and is insulated from the end wall 111. The end of the pole post 140 facing the electrode assembly 120 passes through the end wall 111 and is directly electrically connected to the positive electrode tab 125 or indirectly connected via a current collector 180. In this embodiment, the pole post 140 is connected to the positive electrode tab 125 via the current collector 180. The structure of the pole post 140 can be any suitable form that can pass through the end wall 111 and be electrically connected to the positive electrode tab 125 of the electrode assembly 120. For example, the cross-section can be circular, square, prismatic, or an irregular contour that can achieve stable conductivity. The shape of the pole post hole 1111 corresponds to the shape of the pole post 140. In this embodiment, the cross-section of the pole post 140 is circular.

[0061] Please see Figures 3 to 7 The electrode post 140 includes a columnar portion 142, an outer flange 143, and an inner flange 141. The columnar portion 142 penetrates the electrode post hole 1111. The cross-section of the columnar portion 142 can be circular, square, prismatic, or other irregular contours that can achieve stable conductivity. Considering better sealing and fitting effects, preferably, the columnar portion 142 is adapted to the electrode post hole 1111, that is, the shape of the electrode post hole 1111 corresponds to that of the columnar portion 142. In this embodiment, the cross-section of the columnar portion 142 is circular. The circular design facilitates processing, assembly, and sealing.

[0062] Please see Figures 3 to 7The outer flange 143 is connected to the end of the columnar portion 142 located outside the end wall 111 and extends radially along the end wall 111. The cross-section of the outer flange 143 can be circular, square, prismatic, or other irregular contours that can achieve stable conductivity, and there is no limitation thereto. The inner flange 141 is located inside the housing 110 and extends from the columnar portion 142 toward the outer periphery of the end wall 111. Specifically, the inner flange 141 is connected to the end of the columnar portion 142 located inside the housing 110 and extends toward the outer edge of the end wall 111 along the side of the end wall 111 facing the inside of the housing 110. The cross-section of the inner flange 141 can be circular, square, prismatic, or other irregular contours that can achieve stable conductivity, and there is no limitation thereto.

[0063] Please see Figures 3 to 5 The sealing element 150 is disposed around the columnar portion 142 and is at least partially clamped between the outer flange 143 and the end wall 111. The shape of the sealing element 150 and its position between the pole post 140 and the end wall 111 are not limited. In this embodiment, the sealing element 150 is an annular sealing ring with a rectangular cross-section. Because a lower plastic 190 for isolating the columnar portion 142 and the pole post hole 1111 is also provided between the end wall 111 and the columnar portion 142, a gap exists between the end wall 111 and the columnar portion 142. Therefore, only a portion of the sealing element 150 near the outer ring is clamped by the outer flange 143 and the end wall 111, while the portion near the inner ring is located between the lower plastic 190 and the outer flange 143. In some other embodiments, the seal 150 is an L-shaped annular sealing ring, comprising a first portion sandwiched between the outer flange 143 and the end wall 111, and a second portion sandwiched between the post portion and the pole hole 1111. The seal 150 is an elastic element with a certain compressibility to achieve a seal between the pole 140 and the end wall 111, thereby preventing leakage between the pole 140 and the end wall 111. The material of the seal 150 can be EPDM rubber, fluorosilicone rubber, or fluororubber, but is not limited to these.

[0064] Please see Figure 16 This utility model also provides a battery pack 10, which includes the secondary battery 100 described above. In one embodiment of the battery pack 10, the battery pack 10 includes a housing 101, a cover 102, and multiple secondary batteries 100. The multiple secondary batteries 100 are placed in the housing 101 and are connected in series or parallel, or a combination of series and parallel connections. The cover 102 covers the housing 101 to protect the multiple secondary batteries 100. It should be noted that, in addition to the secondary battery 100 of this utility model, the battery pack 10 may also include a battery pack thermal management system, circuit board, etc. The battery pack 10 can be a battery module, a battery pack, an energy storage cabinet, etc.; these will not be described in detail here.

[0065] Please see Figure 17 This utility model also provides an electronic device 1, which includes the aforementioned battery pack 10. A working part 11 is electrically connected to the battery pack 10 to obtain electrical power. As an example, the electronic device 1 is a vehicle, which can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, but are not limited thereto. The working part 11 is the vehicle body, and the battery pack 10 is located at the bottom of the vehicle body, providing electrical power for the vehicle's operation or the operation of its internal electrical components. However, in other embodiments, the electronic device 1 can also be a mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; the working part 11 can be a unit component capable of obtaining electrical power from the battery pack 10 and performing corresponding work, such as a fan blade rotation unit or a vacuum cleaner suction unit. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the aforementioned electronic device 1.

[0066] In this invention, the injection port of the insulating component can be located within the first recessed platform. Since the first recessed platform is located in the radial center of the disk body, it not only enables a faster injection speed during injection molding but also shortens the time difference for the adhesive to fill both ends radially. The temperature distribution is relatively uniform, reducing warping caused by uneven temperature during cooling and improving the molding quality and consistency of the insulating component. Furthermore, the injection port's location on the first recessed platform allows it to accommodate any protruding injection port marks, preventing them from protruding from the disk surface and being scraped into the secondary battery, thus improving battery safety. Therefore, this invention effectively overcomes some practical problems in the prior art and has high utilization value and significance. The above embodiments are merely illustrative of the principles and effects of this invention and are not intended to limit it. Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of this invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model shall still be covered by the claims of this utility model.

Claims

1. An insulating member, characterized by, The application relates to an insulating piece for a secondary battery. The disc body is circular, the outer circle radius of the disc body is R, and the single-side width of the disc body in the radial direction is L. A plurality of first sunken platforms are arranged on the large surface of the disc body and located within a circular ring region with the center of the disc body as the center; the inner circle radius of the circular ring region is R-L / 2-4mm, the outer circle radius of the circular ring region is R-L / 2+4mm, and the projection area of a single first sunken platform on the large surface of the disc body is 0.07-50mm 2 ; wherein, the units of R and L are mm, and R>L>8mm.

2. The insulator of claim 1, wherein The thickness of the disc body is 0.4-1.2 mm, the recess depth of the first sunken platform is 0.01-0.4 mm, and glue injection marks are arranged in at least part of the first sunken platform.

3. The insulator of claim 1, wherein The disc body comprises a plurality of first reinforcing rib groups which are arranged in a uniform array along the circumference with the center of the disc body as the center, the area of the large face of the disc body is S, the projection area of the first reinforcing rib group on the large face is S1, and the ratio of S1 to S is 20%-70%.

4. The insulator of claim 1, wherein The disc body comprises a plurality of first reinforcing rib groups which are arranged in a uniform array along the circumference with the center of the disc body as the center, and a plurality of second reinforcing rib groups which are arranged in a uniform array along the circumference with the center of the disc body as the center and surround the outer periphery of the first reinforcing rib group; the area of the large face of the disc body is S, the sum of the projection areas of the first reinforcing rib group and the second reinforcing rib group on the large face is S2, and the ratio of S2 to S is 20%-70%.

5. The insulator of claim 1, wherein At least part of the first sunken platform is provided with a second sunken platform, the projection of the second sunken platform on the large face is circular and coaxially arranged with the first sunken platform, the depth of the second sunken platform is 0.01-0.2 mm, the diameter of the second sunken platform is 0.3-4 mm, and glue injection marks are arranged in at least part of the second sunken platform.

6. The insulator of claim 5, wherein The number of the first sunken platforms is 2-4, and the plurality of first sunken platforms are uniformly distributed along the circumference with the center of the disc body as the center.

7. The insulator of claim 5, wherein The first sunken platform and / or the second sunken platform is circular, the diameter of the first sunken platform ranges from 0.3 mm to 8 mm, the diameter of the second sunken platform ranges from 0.3 mm to 4 mm, the difference between the distances of any two first sunken platforms from the center of the disc body is less than or equal to 5 mm, and / or the difference between the distances of any two second sunken platforms from the center of the disc body is less than or equal to 5 mm.

8. The insulator of claim 5, wherein The first sunken platform is circular or square, the second sunken platform is located in the first sunken platform, the included angle between the line connecting the center of any adjacent first sunken platform and the center of the disc body is less than or equal to 90 degrees, and / or the included angle between the line connecting the center of any adjacent second sunken platform and the center of the disc body is less than or equal to 90 degrees.

9. A secondary battery characterized by comprising: The application relates to an insulating piece for a secondary battery.

10. An electronic device, comprising: The application relates to an insulating piece for a secondary battery.

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