Insulating part, battery cover plate and battery

Abstract

The utility model relates to the technical field of batteries, and discloses an insulating part, a battery cover plate and a battery, the insulating part comprises a main body which is hollow to form a pole accommodating groove; protruding parts are arranged on the inner wall face, facing the pole containing groove, of the main body, and the protruding parts are continuously arranged on the whole thickness of the inner wall face in the thickness direction of the main body; and / or, a protruding part is arranged on the outer wall surface, deviating from the pole accommodating groove, of the main body, and the protruding part is continuously arranged on the whole thickness of the outer wall surface in the thickness direction of the main body. According to the utility model, the protruding part is arranged, so that the pole and the cover plate body can be in interference fit with the insulating part, thereby ensuring that both the pole and the cover plate body are in close contact with the insulating part to form an access, and realizing stable positive pole weak conduction.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an insulating member, a battery cover and a battery. Background Art

[0002] In the current lithium-ion battery field, an insulating member (such as upper plastic) is usually provided between the top cover sheet and the pole to realize the positioning and assembly of the pole on the top cover sheet, and to play an insulating role between the pole and the top cover sheet. At the same time, in order to detect the short circuit of the battery cell and prevent the corrosion of the shell, the plastic on the positive electrode contains carbon fiber components, and the positive pole and the top cover sheet both achieve weak conduction by contacting the plastic on the positive electrode (conductive) at the same time. In addition, in order to ensure the sealing of the pole assembly part, a sealing ring is added between the pole and the top cover sheet, and the assembly sealing of the pole is achieved by compressing the sealing ring. However, the sealing ring will rebound slightly after being compressed and assembled. At this time, the positive pole and the top cover sheet will have a gap with the plastic on the positive electrode in the Z direction, and the positive pole and the top cover sheet are gap-assembled with the plastic on the positive electrode in the X and Y directions (such as Figures 1 to 3 As shown), this will cause a short circuit between the positive electrode column and the top cover sheet, making it impossible to achieve weak conduction. Utility Model Content

[0003] In view of this, the utility model provides an insulating member, a battery cover plate and a battery to solve the problem in the prior art that a gap between the pole, the top cover plate and the insulating member forms a short circuit and weak conduction cannot be achieved.

[0004] In the first aspect, the utility model provides an insulating part for a battery cover, comprising: a main body, which is hollow to form a pole receiving groove; the main body is provided with a protrusion on the inner wall surface facing the pole receiving groove, and the protrusion is continuously provided over the entire thickness of the inner wall surface along the thickness direction of the main body; and / or the main body is provided with a protrusion on the outer wall surface away from the pole receiving groove, and the protrusion is continuously provided over the entire thickness of the outer wall surface along the thickness direction of the main body.

[0005] Beneficial effect: By providing the protrusion, the pole and the cover body can be interference-fitted with the insulating member, thereby ensuring that the pole and the cover body are in close contact with the insulating member to form a passage, thereby achieving stable positive electrode weak conduction.

[0006] In an optional embodiment, a plurality of the protrusions are arranged at intervals on the inner wall surface along the circumference of the main body; and / or a plurality of the protrusions are arranged at intervals on the outer wall surface along the circumference of the main body; and / or both the inner wall surface and the outer wall surface are provided with the protrusions, and the protrusions located on the inner wall surface and the protrusions located on the outer wall surface are arranged opposite to each other.

[0007] Beneficial effects: By arranging a plurality of protruding portions along the circumference of the main body, the insulating member is stably connected to the pole column and the cover plate body in the circumferential direction, ensuring the positioning function of the insulating member, preventing the pole column from shifting, reducing the short-circuit risk, and ensuring that the electrodes of the battery have a stable resistance value;

[0008] The protruding portions on the inner wall surface and the outer wall surface are arranged opposite to each other, ensuring balanced stress on the inner and outer sides of the main body, and preventing large deformation from affecting the positioning effect and weak conduction effect of the insulating member.

[0009] In an optional embodiment, the protruding portion is arranged on the inner wall surface, and the thickness of the protruding portion protruding from the inner wall surface is t, satisfying 0.02 mm ≤ t ≤ 0.1 mm; and / or, the protruding portion is arranged on the outer wall surface, and the thickness of the protruding portion protruding from the outer wall surface is t, satisfying 0.02 mm ≤ t ≤ 0.1 mm.

[0010] Beneficial effects: While ensuring the positioning effect and weak conduction effect of the insulating member, it ensures the smooth assembly of the insulating member with the pole column and the cover plate body, and prevents the insulating member from being damaged by extrusion.

[0011] In an optional embodiment, along the circumference of the main body, the width of the protruding portion is w, satisfying 3 mm ≤ w ≤ 10 mm.

[0012] Beneficial effects: While ensuring the positioning effect and weak conduction effect of the insulating member, it ensures the smooth assembly of the insulating member with the pole column and the cover plate body, and prevents the insulating member from being damaged by extrusion.

[0013] In an optional embodiment, the insulating member further includes a partition structure. The partition structure is arranged at one end of the main body in the thickness direction. The outer circumference of the partition structure is connected to the main body, and a communication hole is formed by enclosing the inner circumference of the partition structure. The communication hole is communicated with the pole column receiving groove.

[0014] Beneficial effects: By arranging the partition structure, the isolation between the pole column and the cover plate body is further realized.

[0015] In an optional embodiment, the inner wall surface is provided with the protruding portion, and the inner edge angle at one end of the protruding portion away from the partition structure forms an R-angle structure; and / or, the outer wall surface is provided with the protruding portion, and the outer edge angle at one end of the protruding portion close to the partition structure forms an R-angle structure.

[0016] Beneficial effects: By arranging the R-angle structure, the insulating member is prevented from being damaged by extrusion during the assembly process of the insulating member with the pole column and the cover plate body.

[0017] In an optional embodiment, the radius of the R-angle structure ranges from 0.1 mm to 0.4 mm.

[0018] Beneficial effects: While avoiding extrusion damage to the insulating part during the assembly process of the insulating part with the pole column and the cover plate body, the positioning effect and weak conduction effect of the insulating part are ensured.

[0019] In an alternative embodiment, the main body is perpendicularly arranged with respect to the partition structure, the outer wall surface is provided with the protruding part, and the included angle between the surface of the protruding part away from the main body and the partition structure is α, satisfying 85° ≤ α ≤ 90°.

[0020] Beneficial effects: During the assembly process of the insulating part with the pole column and the cover plate body, the insulating part can be extruded more and more tightly, increasing the contact force between the insulating part and the pole column and the cover plate body, and improving the positioning effect and weak conduction effect of the insulating part.

[0021] In a second aspect, the present invention further provides a battery cover plate, including: a cover plate body, provided with a pole column hole; the above-mentioned insulating part, the insulating part is arranged in the pole column hole; a pole column, passing through the pole column hole and the pole column receiving groove, and the insulating part is in interference fit with the pole column and the cover plate body through the protruding part.

[0022] In a third aspect, the present invention further provides a battery, including the above-mentioned battery cover plate. Description of the drawings

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is an overall structural schematic diagram of an insulating part in the prior art;

[0025] Figure 2 It is a cross-sectional view of a battery cover plate in the xz plane in the prior art;

[0026] Figure 3 It is for Figure 2 The partial enlarged schematic diagram of A in

[0027] Figure 4 It is a structural schematic diagram of an insulating part according to an embodiment of the present invention;

[0028] Figure 5 It is for Figure 4 The top view of the insulating part shown in

[0029] Figure 6 It is forFigure 5 A schematic diagram of the cross-sectional structure along the BB direction (only part is shown);

[0030] Figure 7 A cross-sectional view of a battery cover plate of an embodiment of the utility model in an xz plane;

[0031] Figure 8 for Figure 7 A partial enlarged schematic diagram of C in the middle.

[0032] Description of reference numerals:

[0033] 1. Main body; 11. Pole accommodating groove; 2. Protruding portion; 21. R-angle structure; 3. Separation structure; 31. Connecting hole; 10. Insulating member; 20. Cover body; 30. Pole; 40. Sealing ring. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0035] Combine the following Figures 4 to 8 , describing an embodiment of the utility model.

[0036] According to an embodiment of the present utility model, on the one hand, an insulating member 10 is provided, which is used for a battery cover, such as Figures 4 to 6 As shown, it includes: a main body 1, which is hollow to form a pole accommodating groove 11; a protrusion 2 is provided on the inner wall surface of the main body 1 facing the pole accommodating groove 11, and the protrusion 2 is continuously provided on the entire thickness of the inner wall surface along the thickness direction of the main body 1; and / or a protrusion 2 is provided on the outer wall surface of the main body 1 away from the pole accommodating groove 11, and the protrusion 2 is continuously provided on the entire thickness of the outer wall surface along the thickness direction of the main body 1.

[0037] By providing the protrusion 2, the pole 30 and the cover body 20 can be interference-fitted with the insulating member 10, thereby ensuring that the pole 30 and the cover body 20 are in close contact with the insulating member 10 to form a passage, thereby achieving stable positive electrode weak conduction.

[0038] Please note that Figure 4 and Figure 6, the convex portion 2 is continuously provided in the entire thickness direction of the inner wall surface and / or the outer wall surface of the main body 1, that is, the convex portion 2 is a continuous whole along the thickness direction. The related art discloses an insulating member 10 with reinforcing ribs provided on the inner wall surface and / or the outer wall surface of the main body 1, and the reinforcing ribs are provided in sections along the thickness direction. It can be understood that reference can be made to Figure 8 , when the insulating member 10 in the above related art is fitted with the pole column 30 and the cover plate body 20, along the thickness direction, the main body 1 is prone to break between adjacent reinforcing ribs, and the outer side of the top of the main body 1 does not contact the cover plate body 20. The breakage causes bending, resulting in the top of the main body 1 turning outwards, reducing the contact area between the inner reinforcing ribs and the outer peripheral surface of the pole column 30, resulting in a reduction in the positioning effect and the weak conduction effect of the insulating member 10; moreover, the segmented reinforcing ribs will cause differences in the flatness of the outer surface of a single reinforcing rib, resulting in differences in the tightness of contact between each reinforcing rib and the pole column 30 and the cover plate body 20, which will also affect the positioning effect and the weak conduction effect of the insulating member 10.

[0039] In one embodiment, as Figure 4 and Figure 5 shown, along the circumferential direction of the main body 1, a plurality of convex portions 2 are provided at intervals on the inner wall surface; along the circumferential direction of the main body 1, a plurality of convex portions 2 are provided at intervals on the outer wall surface. By arranging the convex portions 2 in a plurality along the circumferential direction of the main body 1, the insulating member 10 is stably connected to the pole column 30 and the cover plate body 20 along the circumferential direction, ensuring the positioning function of the insulating member 10, preventing the pole column 30 from shifting, reducing the short-circuit risk, and ensuring that the electrodes of the battery have a stable resistance value.

[0040] Specifically, as Figure 5 shown, the outer contour of the main body 1 is a square structure with rounded corners at the four corners, that is, the main body 1 has four straight sides, as Figure 5 shown, one convex portion 2 is correspondingly provided on the inner side and the outer side of each straight side. Of course, a plurality of convex portions 2 can also be provided on the inner side and / or the outer side of each straight side.

[0041] In other alternative embodiments, the outer contour of the main body 1 can also be other shaped structures, such as a circular structure, and the number and arrangement positions of the convex portions 2 can be specifically set according to actual needs.

[0042] In this embodiment, as Figure 4 and Figure 5 shown, convex portions 2 are provided on both the inner wall surface and the outer wall surface of the main body 1. Of course, in other alternative embodiments, convex portions 2 can be provided only on the inner wall surface of the main body 1, or only on the outer wall surface of the main body 1.

[0043] In one embodiment, as Figure 4 and Figure 5As shown, protruding portions 2 are provided on both the inner wall surface and the outer wall surface, and the protruding portions 2 on the inner wall surface and the protruding portions 2 on the outer wall surface are arranged opposite to each other. Arranging the protruding portions 2 on the inner wall surface and the outer wall surface opposite to each other ensures balanced stress on the inner and outer sides of the main body 1, avoiding large deformation and affecting the positioning effect and weak conduction effect of the insulating part 10.

[0044] In one embodiment, as Figure 5 shown, the protruding portion 2 is provided on the inner wall surface, and the thickness of the protruding portion 2 protruding from the inner wall surface is t, satisfying 0.02 mm ≤ t ≤ 0.1 mm; the protruding portion 2 is provided on the outer wall surface, and the thickness of the protruding portion 2 protruding from the outer wall surface is t, satisfying 0.02 mm ≤ t ≤ 0.1 mm. While ensuring the positioning effect and weak conduction effect of the insulating part 10, it ensures the smooth assembly of the insulating part 10 with the pole column 30 and the cover plate body 20, and avoids extrusion damage to the insulating part 10.

[0045] It should be noted that controlling the wall thickness t of the protruding portion 2 is also controlling the interference amount between the insulating part 10 and the pole column 30 and the cover plate body 20. If the value of t is too small, that is, the interference amount is too small, the extrusion force between the insulating part 10 and the pole column 30 and the cover plate body 20 will become smaller, resulting in a reduction in the positioning effect and weak conduction effect of the insulating part 10; if the value of t is too large, that is, the interference amount is too large, it will affect the assembly process of the insulating part 10 with the pole column 30 and the cover plate body 20, and it is easy to squeeze and damage the insulating part 10.

[0046] In one embodiment, as Figure 5 shown, along the circumferential direction of the main body 1, the width of the protruding portion 2 is w, satisfying 3 mm ≤ w ≤ 10 mm. While ensuring the positioning effect and weak conduction effect of the insulating part 10, it ensures the smooth assembly of the insulating part 10 with the pole column 30 and the cover plate body 20, and avoids extrusion damage to the insulating part 10. Specifically, if the value of w is too small, the contact area between the insulating part 10 and the pole column 30 and the cover plate body 20 will be too small, resulting in a reduction in the positioning effect and weak conduction effect of the insulating part 10; if the value of w is too large, it will affect the assembly process of the insulating part 10 with the pole column 30 and the cover plate body 20, and it is easy to squeeze and damage the insulating part 10.

[0047] In one embodiment, as Figures 4 to 6 shown, the insulating part 10 further includes a partition structure 3. The partition structure 3 is provided at one end of the main body 1 in the thickness direction. The outer periphery of the partition structure 3 is connected to the main body 1, and the inner periphery of the partition structure 3 encloses a communication hole 31, and the communication hole 31 is communicated with the pole column receiving groove 11. By providing the partition structure 3, the isolation between the pole column 30 and the cover plate body 20 is further realized.

[0048] In one embodiment, as Figure 6As shown in the figure, a convex portion 2 is provided on the inner wall surface of the main body 1, and an inner side edge angle at one end of the convex portion 2 away from the partition structure 3 forms an R-angle structure 21; a convex portion 2 is provided on the outer wall surface of the main body 1, and an outer side edge angle at one end of the convex portion 2 close to the partition structure 3 forms an R-angle structure 21. By providing the R-angle structure 21, it is possible to prevent the insulating member 10 from being damaged by extrusion during the assembly process of the insulating member 10 with the pole column 30 and the cover plate body 20.

[0049] It should be noted that, please refer to Figure 6 , the inner side edge angle at the upper end of the convex portion 2 located on the inner wall surface forms an R-angle structure 21, and the outer side edge angle at the lower end of the convex portion 2 located on the outer wall surface forms an R-angle structure 21.

[0050] In one embodiment, the radius of the R-angle structure 21 ranges from 0.1 mm to 0.4 mm. While preventing the insulating member 10 from being damaged by extrusion during the assembly process of the insulating member 10 with the pole column 30 and the cover plate body 20, the positioning effect and weak conduction effect of the insulating member 10 are ensured. Specifically, if the radius of the R-angle structure 21 is too small, it will still affect the assembly process of the insulating member 10 with the pole column 30 and the cover plate body 20, and it is easy to cause the insulating member 10 to be damaged by extrusion; if the radius of the R-angle structure 21 is too large, it will cause the contact area between the convex portion 2 and the pole column 30 and the cover plate body 20 to decrease, affecting the positioning effect and weak conduction effect of the insulating member 10.

[0051] In one embodiment, as Figure 6 shown, the main body 1 is perpendicularly arranged with the partition structure 3, a convex portion 2 is provided on the outer wall surface, and the included angle between one side of the convex portion 2 away from the main body 1 and the partition structure 3 is α, satisfying 85° ≤ α ≤ 90°. That is to say, the outer side surface of the convex portion 2 can be gradually inclined outward from one end close to the partition structure 3 to the end away from the partition structure 3, and the degree of inclination does not exceed 5°. During the assembly process of the insulating member 10 with the pole column 30 and the cover plate body 20, the insulating member 10 can be squeezed more and more tightly, increasing the contact force between the insulating member 10 and the pole column 30 and the cover plate body 20, and improving the positioning effect and weak conduction effect of the insulating member 10.

[0052] In one embodiment, the insulating member 10 is upper plastic.

[0053] According to an embodiment of the present invention, on the other hand, a battery cover plate is also provided. As Figure 7 and Figure 8 shown, it includes: a cover plate body 20, provided with a pole column hole; the above-mentioned insulating member 10, the insulating member 10 is arranged in the pole column hole; a pole column 30, passing through the pole column hole and the pole column receiving groove 11, and the insulating member 10 is in interference fit with the pole column 30 and the cover plate body 20 through the convex portion 2.

[0054] Specifically, as Figure 8As shown, the terminal post hole is a stepped hole, the protruding portion 2 is in contact with the hole wall of the outermost hole section of the stepped hole, and the partition structure 3 is in contact with the step surface corresponding to the outermost hole section of the stepped hole.

[0055] In one embodiment, as Figure 8 shown, the battery cover plate further includes a sealing ring 40. The sealing ring 40 is disposed in the terminal post hole and around the terminal post 30, and the sealing ring 40 is compressively disposed between the terminal post 30 and the cover plate body 20.

[0056] According to an embodiment of the present invention, on the other hand, a battery is further provided, including the above-mentioned battery cover plate.

[0057] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. An insulating member for a battery cover, characterized in that: include: A main body (1), wherein the main body (1) is hollow and configured to form a pole receiving groove (11); The main body (1) is provided with a protrusion (2) on the inner wall surface facing the pole accommodating groove (11), and the protrusion (2) is continuously provided over the entire thickness of the inner wall surface along the thickness direction of the main body (1); and / or the main body (1) is provided with a protrusion (2) on the outer wall surface facing away from the pole accommodating groove (11), and the protrusion (2) is continuously provided over the entire thickness of the outer wall surface along the thickness direction of the main body (1).

2. The insulating member according to claim 1, characterized in that Along the circumference of the main body (1), the inner wall surface is provided with a plurality of protrusions (2) at intervals; and / or, Along the circumference of the main body (1), the outer wall surface is provided with a plurality of protrusions (2) at intervals; and / or, The inner wall surface and the outer wall surface are both provided with the protruding portion (2), and the protruding portion (2) located on the inner wall surface and the protruding portion (2) located on the outer wall surface are arranged opposite to each other.

3. The insulating member according to claim 1 or 2, characterized in that: The protrusion (2) is arranged on the inner wall surface, and the wall thickness of the protrusion (2) protruding from the inner wall surface is t, satisfying 0.02mm≤t≤0.1mm; and / or, The protruding portion (2) is arranged on the outer wall surface, and the wall thickness of the protruding portion (2) protruding from the outer wall surface is t, satisfying 0.02mm≤t≤0.1mm.

4. The insulating member according to claim 1 or 2, characterized in that: Along the circumference of the main body (1), the width of the protrusion (2) is w, satisfying 3mm≤w≤10mm.

5. The insulating member according to claim 1 or 2, characterized in that: The insulating member (10) further comprises a partition structure (3), wherein the partition structure (3) is arranged at one end of the main body (1) in the thickness direction, the outer periphery of the partition structure (3) is connected to the main body (1), and the inner periphery of the partition structure (3) is surrounded to form a connecting hole (31), and the connecting hole (31) is connected to the pole accommodating groove (11).

6. The insulating member according to claim 5, characterized in that The inner wall surface is provided with the protrusion (2), and the inner edge of one end of the protrusion (2) away from the partition structure (3) forms an R-angle structure (21); and / or, The outer wall surface is provided with the protruding portion (2), and the outer corner of the protruding portion (2) at one end close to the partition structure (3) forms an R-angle structure (21).

7. The insulating member according to claim 6, characterized in that: The radius of the R-angle structure (21) ranges from 0.1 mm to 0.4 mm.

8. The insulating member according to claim 5, characterized in that: The main body (1) and the partition structure (3) are arranged perpendicularly, the outer wall surface is provided with the protrusion (2), and the angle between the side of the protrusion (2) away from the main body (1) and the partition structure (3) is α, satisfying 85°≤α≤90°.

9. A battery cover, characterized in that: include: The cover plate body (20) is provided with a pole hole; The insulating member (10) according to any one of claims 1 to 8, wherein the insulating member (10) is arranged in the pole hole; The pole (30) is inserted into the pole hole and the pole receiving groove (11), and the insulating member (10) is interference-fitted with the pole (30) and the cover plate body (20) through the protruding portion (2).

10. A battery, characterized in that: Including the battery cover plate as claimed in claim 9.

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