Battery cell insulating ring structure

Abstract

The utility model relates to an insulating ring, in particular to a battery core insulating ring structure, which comprises an annular base body, the annular base body is arranged around a pole by a circle, the annular base body is provided with a buckle along a first direction, and the buckle can be mutually clamped with the edge of the pole; the buckle is provided with a first expansion part extending towards a second direction and a second expansion part extending towards a third direction, the first expansion part and the second expansion part form a first groove, and the edge of the pole is wrapped in the first groove. According to the battery core insulating ring structure disclosed by the utility model, the mounting stability can be ensured, and meanwhile, the negative influence on the battery core caused by excessive glue can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to an insulating ring, especially to a battery cell insulating ring structure. BACKGROUND

[0002] In the structure of lithium battery, an insulating piece is needed to insulate the negative electrode of lithium battery from the aluminum shell, and the insulating piece also plays a role in limiting the compression amount of the sealing ring. There are two common forms of insulating pieces at present: the first one is shown in the invention patent application for lithium battery packaging shell and lithium battery with the publication number CN107768555A. The insulating piece in this patent is in a cylindrical shape. In general, the insulating piece and the pole are placed in direct contact and installed. This installation method may cause the insulating piece to shake due to the fact that the spacer cannot be completely fixed, which is risky. The second one is shown in the Chinese utility model patent for a cylindrical battery top cover assembly with the publication number CN220934245U. The sealing piece in this patent is fixed by injection molding. This fixing method can ensure the stability of the installation of the sealing piece, but it is prone to overflow, requires a high degree of flatness of the installation surface, and has a high production cost.

[0003] Therefore, it is necessary to improve the insulating ring structure in the battery cell. CONTENT OF THE UTILITY MODEL

[0004] In order to overcome the deficiencies in the prior art, the utility model provides a battery cell insulating ring structure to facilitate the installation and fixation of the insulating ring.

[0005] The utility model discloses a kind of battery cell insulating ring structures, including annular matrix, the annular matrix is arranged around pole, the annular matrix is provided with buckle along first direction, the buckle can be mutually clamped with the edge of pole.

[0006] Preferably, the buckle has a first extension part extending in a second direction and a second extension part extending in a third direction, the first extension part and the second extension part form a first groove, and the first groove covers the edge of the pole.

[0007] Preferably, the pole includes a first part and a second part, and the cross-sectional area of the first part is smaller than that of the second part.

[0008] Preferably, one end of the second part is inwardly retracted to form a second groove, a flange is formed above the second groove, the first groove covers the flange, and the end of the second extension part extends into the second groove.

[0009] Preferably, one side surface of the second part is an inclined surface, and one side surface of the second extension part is an inclined surface.

[0010] Preferably, the length of the second extension part in the third direction is defined as L, wherein 0.3mm≤L≤0.5mm.

[0011] Preferably, the distance between one end of the first extension part and one end of the second part is defined as L2, wherein L2≥0.5mm.

[0012] Preferably, the annular base is made of PP material.

[0013] The beneficial effects of the utility model are:

[0014] (1) The insulating ring is fixed with the pole through the buckle, which can ensure the relative fixation of the insulating ring and the pole, thereby avoiding the risk caused by excessive deviation of the insulating ring and improving the safety performance of the battery cell.

[0015] (2) The insulating ring is fixed with the pole through the buckle, which is simpler in process compared with the existing installation mode of integrally molded by injection molding, and avoids the influence of glue overflow on the product. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The utility model discloses the installation schematic diagram of insulating ring in battery cell;

[0017] Figure 2 The utility model discloses the structure schematic diagram (the direction of looking up) of insulating ring;

[0018] Figure 3 The utility model discloses the structure schematic diagram (the direction of looking up) of insulating ring;

[0019] Figure 4 The utility model discloses the structure schematic diagram of pole and insulating ring cooperation installation;

[0020] Figure 5 The utility model discloses the structure schematic diagram of pole;

[0021] Figure 6 The utility model discloses the structure schematic diagram of pole and insulating ring cooperation;

[0022] In the drawing, 1, annular base;2, pole;3, buckle;4, first extension part;5, second extension part;6, first recess;7, first part;8, second part;9, second recess;10, flange. DETAILED DESCRIPTION

[0023] The principles and characteristics of the utility model are described below in combination with the drawings Figure 1 to the drawings Figure 6 and examples, and the examples are only used to explain the utility model and are not used to limit the scope of the utility model.

[0024] It should be noted that in the following embodiments, the terms "first", "second", and "third" are used only to distinguish the various technical features and should not be construed as indications or implications.

[0025] In this invention, the electrode post 2 includes a first portion 7 and a second portion 8, with the second portion 8 disposed below the first portion 7. The cross-sectional area of ​​the first portion 7 is smaller than that of the second portion 8. The second portion 8 is located inside the battery cell, while the first portion 7 extends outwards to form the electrode post body. In this embodiment, both the first portion 7 and the second portion 8 are cylindrical; in other preferred embodiments, the first portion 7 and the second portion 8 may also be other shapes such as regular polygons or ellipses.

[0026] An insulating ring structure for a battery cell includes an annular base 1, which surrounds a terminal post 2. The annular base 1 should match the shape of the second portion 8 of the terminal post 2. In this embodiment, since the second portion 8 is cylindrical, the annular base 1 is annular. The annular base 1 is provided with a snap fastener 3 along a first direction. One or more snap fasteners 3 can be provided (four in this embodiment). When there is only one snap fastener 3, a complete annular structure is formed; when multiple snap fasteners 3 are arranged in an array, adjacent snap fasteners 3 are spaced apart. The snap fasteners 3 can engage with the edge of the terminal post 2, specifically with the edge of the second portion 8. The first direction mentioned above is the peripheral direction. Figure 1 The X direction in the diagram is the circumferential direction of the annular matrix 1.

[0027] The latch 3 has a first extension 4 extending in a second direction and a second extension 5 extending in a third direction. The second direction mentioned above refers to the attachment... Figure 6 The Y direction is the axial direction of the annular matrix 1; the third direction is the attached direction. Figure 6 The Z direction in the figure is the radial direction of the annular matrix 1. Based on the attached... Figure 6 As shown in the positional relationship, the thickness of the lower part of the first extension 4 is greater than the thickness of the upper part. The first extension 4 and the second extension 5 form a first groove 6, which covers the edge portion of the pole post 2 (i.e., the edge portion of the second section 8).

[0028] In order to mate with the first groove 6, the bottom end of the second portion 8 of the pole post 2 (based on the attached) Figure 6 (As shown in the positional relationship) the second groove 9 is formed by inward contraction, the flange 10 is formed above the second groove 9, the first groove 6 covers the flange 10 therein, and the end of the second extension 5 extends into the second groove 9.

[0029] To facilitate the installation of the insulating ring and the pole post 2, one of the upper sides of the flange 10 (based on the attached) Figure 6 The positional relationship shown is an inclined surface; the lower side of the second extension 5 (based on the attached) is an inclined surface. Figure 6The lower side of the second extending part 5 and the upper side of the flange 10 are both inclined surfaces, and the buckle 3 is gradually expanded until the second extending part 5 falls into the second groove 9 under the action of the inclined surfaces.

[0030] The length of the second extending part 5 in the third direction is defined as L (see the attached drawings) and 0.3mm≤L≤0.5mm. Figure 6 If L is less than 0.3mm, the clamping effect will be affected and the heat after the welding of the current collector plate and the pole 2 may melt the buckle 3; if L is greater than 0.5mm, the force during the installation and clamping will be too large and the staff will not be able to operate. In order to prevent the insulation ring from affecting the welding when the current collector plate is welded, L2 (see the attached drawings) should also be ensured to be ≥0.5mm, that is, the distance between the bottom end of the first extending part 4 and the second part 8. ​

[0031] In the embodiment, the annular base body 1 is made of PP, and in the other preferred embodiments, the annular base body 1 can also be made of common PI, PET and other materials.

[0032] The above only describes the preferred embodiments of the utility model and is not used to limit the utility model, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.​

Claims

1. An electric cell insulating ring structure, characterized by, The application relates to a ring-shaped base (1) which is arranged around a pole (2) and which is provided with a clasp (3) in a first direction, the clasp (3) being capable of being clamped with the edge of the pole (2).

2. The cell insulator ring structure of claim 1, wherein, The clasp (3) has a first extension (4) extending in a second direction and a second extension (5) extending in a third direction, the first extension (4) and the second extension (5) forming a first groove (6), the first groove (6) covering the edge of the pole (2).

3. The cell insulator ring structure of claim 2, wherein, The pole (2) comprises a first part (7) and a second part (8), the cross-sectional area of the first part (7) being smaller than that of the second part (8).

4. The cell insulator ring structure of claim 3, wherein, One end of the second part (8) is inwardly retracted to form a second groove (9), the upper part of the second groove (9) forming a flange (10), the first groove (6) covering the flange (10), and the end of the second extension (5) extending into the second groove (9).

5. The cell insulator ring structure of claim 4, wherein, One side of the second part (8) is an inclined surface, and one side of the second extension (5) is an inclined surface.

6. The cell insulator ring structure of claim 2, wherein, The length of the second extension (5) in the third direction is defined as L, wherein 0.3mm<=L<=0.5mm.

7. The cell insulator ring structure of claim 3, wherein, The distance between one end of the first extension (4) and one end of the second part (8) is defined as L2, wherein L2>=0.5mm.

8. The cell insulator ring structure of any of claims 1-7, wherein, The ring-shaped base (1) is made of PP.

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