Pole sealing structure and battery cover plate structure thereof

Abstract

The utility model provides a pole sealing structure and a battery cover plate structure thereof, the pole sealing structure comprises a pole, upper plastic cement, a light aluminum plate, lower plastic cement, a sealing ring and a riveting block, the pole sequentially penetrates through the lower plastic cement, the light aluminum plate and the upper plastic cement from bottom to top, the upper end of the pole is riveted through the riveting block, an annular boss is arranged at the bottom of a pole hole of the upper plastic cement, and the sealing ring is arranged on the boss. The smooth aluminum plate is provided with an annular groove matched with the boss, the inner side face of the boss is provided with a chamfer, the sealing ring is arranged on the pole in a sleeving mode, the outer side of the sealing ring is matched with the lower plastic, the smooth aluminum plate and the upper plastic, and the upper end of the sealing ring abuts against the surface of the chamfer. The positive pole and the negative pole of the battery cover plate structure are connected by adopting the pole sealing structure. The sealing structure is additionally provided with the chamfered boss, the chamfered boss can be in close contact with the sealing ring after assembly, and a certain compression amount can be formed, so that external electrolyte can be prevented from polluting the pole, and the reject ratio in the battery manufacturing process is reduced.

Description

Technical Field

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

[0002] like Figure 1 and Figure 2 As shown, a sealing ring 7 is used outside the pole 1 to achieve sealing between the upper plastic 2 and the plain aluminum plate 3. After the riveted battery cover is assembled, an assembly gap will exist on the contact surface 8 (see the red line in the figure) between the upper plastic 2 and the plain aluminum plate 3. During the battery manufacturing process, when the electrolyte is injected, the electrolyte will overflow. After flowing to the vicinity of the pole 1, the electrolyte will pass through the assembly gap 8 to connect the pole 1 and the plain aluminum plate 3, forming a path between the battery pole and the shell, thereby causing poor battery insulation. Utility Model Content

[0003] The technical problem to be solved by the present invention is: in order to overcome the deficiency of the assembly gap between the upper plastic and the plain aluminum plate in the prior art, the present invention provides a pole sealing structure and a battery cover structure thereof, which can avoid the problem of poor battery insulation caused by electrolyte contamination of the pole and improve the yield rate in the battery production process.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a pole sealing structure, including a pole, an upper plastic, a plain aluminum plate, a lower plastic, a sealing ring and a rivet block, the pole passes through the lower plastic, the plain aluminum plate and the upper plastic in sequence from bottom to top, the upper end of the pole is riveted by the rivet block, the bottom of the pole hole of the upper plastic is provided with an annular boss, the plain aluminum plate is provided with a ring groove matching the boss, the inner side surface of the boss is provided with a chamfer, the sealing ring is sleeved on the pole, the outer side of the sealing ring matches the lower plastic, the plain aluminum plate and the upper plastic, and the upper end of the sealing ring abuts against the chamfered surface.

[0005] Furthermore, the width C1 of the chamfer is in the range of 0.1-1 mm, the height C2 is in the range of 0.1-1.2 mm, the height H of the boss is in the range of 0.2-1 mm, and the inclination angle α of the chamfer is in the range of 20°-80°.

[0006] Furthermore, when the upper end of the sealing ring contacts the chamfered surface, the compression amount of the sealing ring is in a range of 20% to 50%.

[0007] Furthermore, in order to avoid rotation, a positioning structure is provided on the contact surface between the upper plastic and the plain aluminum plate. The positioning structure includes a positioning column / positioning hole provided on the bottom surface of the upper plastic, and the plain aluminum plate is provided with a positioning hole / positioning column that cooperates with the positioning column / positioning hole.

[0008] Preferably, there are two positioning posts and two positioning slots, which are symmetrically arranged along the radial direction.

[0009] A battery cover structure includes a positive electrode column, a negative electrode column, a positive electrode sealing ring, a negative electrode sealing ring, a lower plastic, a plain aluminum plate, a positive electrode upper plastic, a negative electrode upper plastic, a positive electrode rivet block, and a negative electrode rivet block. The connection between the positive electrode column, the positive electrode sealing ring and the lower plastic, the plain aluminum plate, and the positive electrode upper plastic, as well as the connection between the negative electrode column, the negative electrode sealing ring and the lower plastic, the plain aluminum plate, and the negative electrode upper plastic, all adopt the above-mentioned electrode sealing structure, and the upper end of the positive electrode column is riveted by the positive electrode rivet block, and the upper end of the negative electrode column is riveted by the negative electrode rivet block.

[0010] Furthermore, in order to facilitate the positioning and installation between the upper plastic and the bare aluminum plate, the bare aluminum plate is provided with a positive electrode positioning groove that matches the shape of the upper plastic of the positive electrode, and a negative electrode positioning groove that matches the shape of the upper plastic of the negative electrode. During assembly, the upper plastic of the positive electrode is embedded in the positive electrode positioning groove.

[0011] The beneficial effect of the present invention is that the present invention provides a pole sealing structure and a battery cover structure thereof, which add a chamfered boss. After assembly, the chamfer can be in close contact with the sealing ring and can form a certain amount of compression, thereby isolating the external electrolyte from contaminating the pole and reducing the defective rate in the battery manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 It is a schematic diagram of a conventional pole sealing structure in the prior art.

[0014] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at the assembly gap.

[0015] Figure 3 It is a cross-sectional schematic diagram of the pole sealing structure of the present utility model.

[0016] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure at the assembly gap.

[0017] Figure 5 It is a schematic diagram of the structure of the plastic.

[0018] Figure 6 It is a schematic diagram of the cross-sectional structure of the upper plastic.

[0019] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure at point A in the middle.

[0020] Figure 8 This is a schematic diagram of the positioning holes on the bare aluminum plate.

[0021] Figure 9 It is a schematic diagram of the battery cover structure of the present utility model.

[0022] Figure 10 yes Figure 9 Schematic cross-section of the positive electrode column side of the battery cover structure.

[0023] Figure 11 yes Figure 9 Schematic cross-section of the negative electrode column side of the battery cover structure.

[0024] In the figure: 1. Pole, 1a. Positive pole, 1b. Negative pole, 2. Upper plastic, 2a. Positive upper plastic, 2b. Negative upper plastic, 2.1. Pole hole, 2.2. Boss, 2.3. Chamfer, 2.4. Positioning column, 3. Plain aluminum plate, 3.1. Positioning hole, 3.2. Positive positioning groove, 3.3. Negative positioning groove, 4. Lower plastic, 5. Riveting block, 5a. Positive riveting block, 5b. Negative riveting block, 7. Sealing ring, 7a. Positive sealing ring, 7b. Negative sealing ring, 8. Contact surface. DETAILED DESCRIPTION

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating the basic structure of the present invention only in a schematic manner. They therefore only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) are intended solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0026] like Figure 3 and Figure 4 As shown, a pole sealing structure of the present invention includes a pole 1, an upper plastic 2, a plain aluminum plate 3, a lower plastic 4, a sealing ring 7 and a rivet block 5. The pole 1 passes through the lower plastic 4, the plain aluminum plate 3 and the upper plastic 2 from bottom to top, and the upper end of the pole 1 is riveted by the rivet block 5. The bottom of the pole hole 2.1 of the upper plastic 2 is provided with an annular boss 2.2, and the plain aluminum plate 3 is provided with a ring groove that cooperates with the boss 2.2. The inner side surface of the boss 2.2 is provided with a chamfer 2.3. The sealing ring 7 is sleeved on the pole 1, and the outer side of the sealing ring 7 cooperates with the lower plastic 4, the plain aluminum plate 3 and the upper plastic 2, and the upper end of the sealing ring 7 abuts against the surface of the chamfer 2.3. Figure 3The area indicated by the green line is the improved contact surface 88, which is pressed onto the sealing ring 7 at the chamfer 2.3, so that the two are in close contact, avoiding assembly gaps, thereby isolating external electrolyte from contaminating the electrode through the assembly gap; when the upper end of the sealing ring 7 abuts the surface of the chamfer 2.3, the compression range of the sealing ring 7 is between 20% and 50%.

[0027] like Figure 5-Figure 7 As shown, the width C1 of the chamfer 2.3 ranges from 0.1-1 mm, the height C2 ranges from 0.1-1.2 mm, the height H of the boss 2.2 ranges from 0.2-1 mm, and the inclination angle α of the chamfer 2.3 ranges from 20° to 80°, more preferably, 30°, 45° or 60°.

[0028] like Figure 5 and Figure 8 As shown, the contact surface 8 between the upper plastic 2 and the bare aluminum plate 3 is also provided with a positioning structure. This positioning structure comprises a positioning post 2.4 / positioning hole 3.1 disposed on the bottom surface of the upper plastic 2. The bare aluminum plate 3 is provided with a positioning hole 3.1 / positioning post 2.4 that cooperates with the positioning post 2.4 / positioning hole 3.1. In this embodiment, there are two positioning posts 2.4 and two positioning slots, each symmetrically arranged along the radial direction. The positioning post 2.4 is disposed on the bottom surface of the upper plastic 2, and the positioning hole 3.1 is disposed in the bare aluminum plate 3. Preferably, the positioning hole 3.1 is a blind hole.

[0029] like Figures 9-11 As shown, a battery cover structure includes a positive electrode column 1a, a negative electrode column 1b, a positive electrode sealing ring 7a, a negative electrode sealing ring 7b, a lower plastic 4, a plain aluminum plate 3, a positive electrode upper plastic 2a, a negative electrode upper plastic 2b, a positive electrode rivet block 5a and a negative electrode rivet block 5b, wherein the connection between the positive electrode column 1a, the positive electrode sealing ring 7a and the lower plastic 4, the plain aluminum plate 3, and the positive electrode upper plastic 2a, as well as the connection between the negative electrode column 1b, the negative electrode sealing ring 7b and the lower plastic 4, the plain aluminum plate 3, and the negative electrode upper plastic 2b, all adopt the above-mentioned electrode sealing structure, and the upper end of the positive electrode column 1a is riveted by the positive electrode rivet block 5a, and the upper end of the negative electrode column 1b is riveted by the negative electrode rivet block 5b. In order to facilitate the positioning and installation between the upper plastic and the bare aluminum plate 3, the bare aluminum plate 3 is provided with a positive electrode positioning groove 3.2 that matches the shape of the upper plastic 2a of the positive electrode, and a negative electrode positioning groove 3.3 that matches the shape of the upper plastic 2b of the negative electrode. During assembly, the upper plastic 2a of the positive electrode is embedded in the positive electrode positioning groove 3.2. There are two positive and negative poles, so there are also two pole holes 2.1 on the bare aluminum plate 3; the directions of the positioning holes 3.1 at the positive and negative poles on the bare aluminum plate 3 can be the same or different. In this embodiment, Figure 9 The directions of the positioning holes 3.1 on the positive electrode side and the positioning holes 3.1 on the negative electrode side are different.

[0030] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the scope of the present invention. The technical scope of this 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 sealing structure, characterized in that: It includes a pole, an upper plastic, a plain aluminum plate, a lower plastic, a sealing ring and a rivet block. The pole passes through the lower plastic, the plain aluminum plate and the upper plastic from bottom to top in sequence. The upper end of the pole is riveted by the rivet block. The bottom of the pole hole of the upper plastic is provided with an annular boss. The plain aluminum plate is provided with a ring groove that cooperates with the boss. The inner side surface of the boss is provided with a chamfer. The sealing ring is sleeved on the pole. The outer side of the sealing ring cooperates with the lower plastic, the plain aluminum plate and the upper plastic, and the upper end of the sealing ring abuts against the chamfered surface.

2. The pole sealing structure according to claim 1, wherein: The width C1 of the chamfer is in the range of 0.1-1 mm, the height C2 is in the range of 0.1-1.2 mm, the height H of the boss is in the range of 0.2-1 mm, and the inclination angle α of the chamfer is in the range of 20°-80°.

3. The pole sealing structure according to claim 2, wherein: When the upper end of the sealing ring contacts the chamfered surface, the compression amount of the sealing ring is in a range of 20% to 50%.

4. The pole sealing structure according to any one of claims 1 to 3, characterized in that: A positioning structure is also provided on the contact surface between the upper plastic and the bare aluminum plate. The positioning structure includes a positioning column / positioning hole provided on the bottom surface of the upper plastic. The bare aluminum plate is provided with a positioning hole / positioning column that cooperates with the positioning column / positioning hole.

5. The pole sealing structure according to claim 4, wherein: There are two positioning posts and two positioning slots, which are symmetrically arranged along the radial direction.

6. A battery cover structure, characterized in that: It includes a positive electrode column, a negative electrode column, a positive electrode sealing ring, a negative electrode sealing ring, a lower plastic, a plain aluminum plate, a positive electrode upper plastic, a negative electrode upper plastic, a positive electrode rivet block and a negative electrode rivet block, wherein the connection between the positive electrode column, the positive electrode sealing ring and the lower plastic, the plain aluminum plate, and the positive electrode upper plastic, as well as the connection between the negative electrode column, the negative electrode sealing ring and the lower plastic, the plain aluminum plate, and the negative electrode upper plastic all adopt the electrode column sealing structure according to any one of claims 1 to 5, and the upper end of the positive electrode column is riveted by the positive electrode rivet block, and the upper end of the negative electrode column is riveted by the negative electrode rivet block.

7. The battery cover structure according to claim 6, wherein: The plain aluminum plate is provided with a positive electrode positioning groove matching the shape of the plastic on the positive electrode, and a negative electrode positioning groove matching the shape of the plastic on the negative electrode. During assembly, the plastic on the positive electrode is embedded in the positive electrode positioning groove.

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