Pole structure and secondary battery top cover thereof

Abstract

The utility model relates to the technical field of battery top cover production processes, in particular to a pole structure and a secondary battery top cover thereof. The utility model provides a pole structure which comprises a positive pole body, a negative pole body, a positive pole, a negative pole, a positive pole and a negative pole, a compression sealing part is arranged on the column middle part in a sleeving manner; according to the utility model, the compressed sealing rings are arranged on the positive and negative pole bodies, so that the effect of replacing upper plastic for sealing and insulating is realized, the production cost is reduced, the occupied space of the upper plastic is reduced, and the capacity of the single cell is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of battery top cover production technology, in particular to a pole structure and a secondary battery top cover thereof. Background Art

[0002] The main parts of the existing secondary battery top cover include positive and negative electrode posts, sealing rings, plain aluminum sheets, positive and negative electrode upper plastics, and positive and negative electrode lower plastics. The positive and negative electrode posts are sealed mainly by applying a certain force to compress the sealing ring to a certain amount before injection molding the positive and negative electrode upper plastics, and at the same time, a circle of grooves will be added in the middle of the post by a CNC machine; the upper plastic will flow into the groove by injection molding (glue pouring), and the force compressing the lower plastic will be released after the upper plastic is formed. At this time, due to the clamping effect of the upper plastic, the sealing ring maintains the compression amount and does not rebound.

[0003] The pole described above needs to be processed by CNC to add an additional groove for force bearing, which increases the cost of the pole and makes it easy for metal chips to be hidden in the groove. Therefore, the pole described above is an I-shaped pole, which is difficult to process and needs to be processed by CNC. During CNC processing, metal chips or unremoved metal wires will inevitably exist. Therefore, this method has two risks:

[0004] The metal wire causes a short circuit during the injection molding process, resulting in failure of the top cover insulation. The cost and production capacity of this method are seriously insufficient.

[0005] Due to the presence of plastic during injection molding and the sealing ring hidden inside, the above structure will inevitably result in defective products without sealing rings passing the airtightness test due to false sealing of the plastic, resulting in more cost losses.

[0006] Therefore, how to achieve pole sealing and maintain a large capacitance is a technical problem that needs to be solved urgently in this field. Utility Model Content

[0007] The utility model provides a pole structure and a secondary battery top cover thereof to solve the above technical problems.

[0008] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides a pole structure, including: a positive and negative pole column, which includes a column bottom, a column middle, a column top and a column chamfered portion from bottom to top; and a compression sealing portion is sleeved on the column middle portion; the compression sealing portion includes a rubber ring; the rubber ring includes a first ring layer and a second ring layer arranged up and down, and the outer diameter of the second ring layer is greater than the outer diameter of the first ring layer.

[0009] Furthermore, the bottom of the column is a rectangular block, and the middle part of the column, the top part of the column and the chamfered part of the column are all frustum.

[0010] Furthermore, the width of the bottom of the column is greater than the diameter of the middle of the column and the top of the column, and the diameter of the middle of the column is smaller than the diameter of the top of the column.

[0011] The utility model also provides a secondary battery top cover, comprising: a plain aluminum sheet, a surface of which is provided with a pole hole suitable for placing the positive and negative pole columns as described in any one of claims 1 to 4, and an outer diameter of the second circle layer is the same as the inner diameter of the pole hole, the second circle layer is arranged in the pole hole, and the plain aluminum sheet is exposed by the first circle layer.

[0012] Furthermore, a lower plastic is provided on the bottom surface of the smooth aluminum sheet, a convex portion is provided on the lower plastic, and a first limiting portion is provided on the convex portion.

[0013] Furthermore, a sunken platform matched with the protruding portion is arranged on the bottom surface of the bare aluminum sheet around the pole hole, and a second limiting portion is arranged on the sunken platform.

[0014] Furthermore, the second limiting portion is an annular groove, and the first limiting portion is an annular protrusion.

[0015] Furthermore, the second limiting portion is an annular protrusion, and the first limiting portion is an annular groove.

[0016] Compared with the prior art, the embodiments of the utility model have the following beneficial effects: by arranging compressed sealing rings on the positive and negative poles, the effect of replacing the upper plastic sealing insulation is achieved, the production cost is reduced, the space occupied by the upper plastic is reduced, and the capacity of the single battery cell is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 A three-dimensional diagram of a preferred embodiment of a pole structure of the utility model;

[0019] Figure 2 A three-dimensional cross-sectional view of a preferred embodiment of a pole structure of the utility model;

[0020] Figure 3 A three-dimensional diagram of a preferred embodiment of a secondary battery top cover of the utility model;

[0021] Figure 4 It is a three-dimensional cross-sectional view of a preferred embodiment of a secondary battery top cover of the utility model;

[0022] Figure 5 It is a three-dimensional diagram of the optimal embodiment of the lower plastic of the utility model.

[0023] Among them, 1. plain aluminum sheet; 11. pole hole; 12. sink; 13. second limiting part; 2. positive and negative pole columns; 21. bottom of column; 22. middle of column; 23. top of column; 24. chamfered part of column; 3. lower plastic; 31. raised part; 32. first limiting part; 4. compression sealing part; 41. first circle layer; 42. second circle layer. DETAILED DESCRIPTION

[0024] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0025] See also Figure 1 , Figure 1 This is a stereogram of the optimal embodiment of a pole structure of the utility model. Figure 1 As shown, at least one embodiment provides a pole structure, including: a positive and negative pole pole body 2, which includes a pole bottom 21, a pole middle 22, a pole top 23 and a pole chamfered portion 24 from bottom to top; and a compression sealing portion 4 is sleeved on the pole middle 22, and the compression sealing portion 4 is used to replace the upper plastic.

[0026] See also Figure 2 , Figure 2 This is a three-dimensional cross-sectional view of the optimal embodiment of a pole structure of the utility model. Figure 2 As shown, the positive and negative pole columns 2 are composed of a column bottom 21, a column middle 22, a column top 23 and a column chamfered portion 24, wherein the column top 23 and the column chamfered portion 24 are formed by riveting, and the compression seal portion 4 is put on before riveting, and the compression seal portion 4 is in an uncompressed state after riveting. The column bottom 21 is a rectangular block, the column middle 22, the column top 23 and the column chamfered portion 24 are all truncated cones, the width of the column bottom 21 is greater than the diameters of the column middle 22 and the column top 23, and the diameter of the column middle 22 is smaller than the diameter of the column top 23.

[0027] Please continue reading Figure 2 .like Figure 2 As shown, the composition structure of the compression seal part 4 is described in detail below. The compression seal part 4 includes a rubber ring. At this time, the rubber ring is in a compressed state, and its compression amount is 15%-45%. The rubber ring includes a first ring layer 41 and a second ring layer 42 arranged up and down, and the outer diameter of the second ring layer 42 is larger than the outer diameter of the first ring layer 41. The compressed rubber ring replaces the upper plastic, and the space where the upper plastic is located is removed.

[0028] Please continue reading Figure 1 Combined with Figure 3 to Figure 4 , Figure 3 A three-dimensional diagram of a preferred embodiment of a secondary battery top cover of the utility model; Figure 4This is a three-dimensional cross-sectional view of the optimal embodiment of a secondary battery top cover of the utility model. Figure 1 , Figure 3 to Figure 4 As shown, some embodiments further provide a secondary battery top cover, comprising: a bare aluminum sheet 1, a pole hole 11 suitable for placing the positive and negative poles 2 is opened on its surface, a sink 12 adapted to the protrusion 31 is arranged around the pole hole 11 on the bottom surface of the bare aluminum sheet 1, and a second limiter 13 is arranged on the sink 12. The outer diameter of the second ring layer 42 is the same as the inner diameter of the pole hole 11, the second ring layer 42 is arranged in the pole hole 11, and the first ring layer 41 exposes the bare aluminum sheet 1.

[0029] Please continue reading Figure 3 Combined with Figures 4 to 5 , Figure 5 This is a stereogram of the best embodiment of the lower plastic of the utility model. Figure 3 to Figure 4 As shown. The bottom surface of the light aluminum sheet 1 is provided with a lower plastic 3, a protrusion 31 is provided at the lower plastic 3, and a first limiting portion 32 is provided on the protrusion 31. The second limiting portion 13 is an annular groove, and the first limiting portion 32 is an annular protrusion. The second limiting portion 13 is an annular protrusion, and the first limiting portion 32 is an annular groove. The second limiting portion 13 and the first limiting portion 32 cooperate with each other to achieve an anti-twist effect.

[0030] In summary, the utility model achieves the effect of replacing the upper plastic sealing insulation by arranging compressed sealing rings on the positive and negative electrode columns 2, thereby reducing production costs, reducing the space occupied by the upper plastic, and increasing the capacity of the single battery cell. By arranging the second limiting portion 13 and the first limiting portion 32, an anti-twisting effect is achieved, thereby enhancing the assembly stability of the battery cover.

[0031] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A pole structure, characterized in that: include: The positive and negative electrode columns (2) include, from bottom to top, a column bottom (21), a column middle (22), a column top (23) and a column chamfered portion (24); and A compression sealing portion (4) is sleeved on the middle portion (22) of the column; The compression sealing portion (4) comprises a rubber ring, and the rubber ring comprises a first ring layer (41) and a second ring layer (42) arranged up and down, and the outer diameter of the second ring layer (42) is greater than the outer diameter of the first ring layer (41).

2. The pole structure according to claim 1, characterized in that: The column bottom (21) is a rectangular block, and the column middle (22), column top (23) and column chamfered portion (24) are all truncated cones.

3. The pole structure according to claim 1, characterized in that: The width of the column bottom (21) is greater than the diameters of the column middle (22) and the column top (23), and the diameter of the column middle (22) is smaller than the diameter of the column top (23).

4. A secondary battery top cover, characterized in that: include: A bare aluminum sheet (1) having a pole hole (11) on its surface suitable for placing the positive and negative pole columns (2) as claimed in any one of claims 1 to 3, and The outer diameter of the second ring layer (42) is the same as the inner diameter of the pole hole (11); the second ring layer (42) is arranged in the pole hole (11); and the first ring layer (41) exposes the bare aluminum sheet (1).

5. The secondary battery top cover according to claim 4, characterized in that: The bottom surface of the smooth aluminum sheet (1) is provided with a lower plastic (3), and the lower plastic (3) is provided with a protrusion (31), and The raised portion (31) is provided with a first limiting portion (32).

6. The secondary battery top cover according to claim 5, characterized in that: The bottom surface of the bare aluminum sheet (1) is provided with a sink (12) around the pole hole (11) and adapted to the protrusion (31); and A second limiting portion (13) is provided on the sinking platform (12).

7. The secondary battery top cover according to claim 6, characterized in that: The second limiting portion (13) is an annular groove, and the first limiting portion (32) is an annular protrusion.

8. The secondary battery top cover according to claim 7, characterized in that: The second limiting portion (13) is an annular protrusion, and the first limiting portion (32) is an annular groove.

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