Battery top cover structure

Abstract

The utility model provides a battery top cover structure which comprises a pole body, a sealing ring, a top cover piece and lower plastic, the top cover piece is fixed with the lower plastic in an attached mode, two welding holes for installing the pole body are formed in the top cover piece, the welding holes penetrate through the lower plastic, and the sealing ring is installed below the pole body. An annular plastic body is arranged outside the pole body in an injection molding mode, the pole body is connected with a welding ring through the plastic body, the plastic body is attached to the inner wall of the welding hole and the surface of the pole body, and the welding ring is welded and fixed to the welding hole. The welding ring and the pole body are subjected to independent injection molding to form the plastic body, and then the plastic body is welded with the top cover plate, so that the problem that the pole body and the welding ring are easy to deform is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery top cover structure. BACKGROUND

[0002] The existing square battery cover plate adopts the mode of injection molding of the pole and the welding ring in order to provide the overcurrent, resistance, torsion and thrust capacity of the battery cell.

[0003] In the prior art, the welding ring and the top cover sheet are welded and then injection molded, and due to the structural limitation, the welding ring and the pole are relatively thin in thickness and are prone to deformation after injection molding. UTILITY MODEL CONTENTS

[0004] The utility model discloses a battery top cover structure, which is formed by separately injection molding the welding ring and the pole body and then welding the pole body and the welding ring with the top cover sheet, thereby solving the problem of deformation of the pole body and the welding ring.

[0005] The utility model discloses a battery top cover structure, which is formed by separately injection molding the welding ring and the pole body and then welding the pole body and the welding ring with the top cover sheet, thereby solving the problem of deformation of the pole body and the welding ring.

[0006] The pole body is injection molded with an annular plastic body on the outside and is connected with the welding ring through the plastic body, the plastic body abuts against the inner wall of the welding hole and the surface of the pole body, and the welding ring is welded and fixed with the welding hole.

[0007] Further, the middle part of the top cover sheet is installed on the explosion-proof valve, and the explosion-proof valve film is attached to the top cover sheet.

[0008] Further, the welding hole of the top cover sheet has an annular connecting seat, the inner wall of the connecting seat has an inclined surface, and the lower end of the welding ring has a certain spacing with the inclined surface, and the welding ring is welded with the inner wall of the connecting seat.

[0009] Further, the bottom part of the welding hole of the top cover sheet has an inwardly extending bottom edge for abutting against the sealing ring.

[0010] Further, the pole body is convex, the plastic body is sleeved on the outer surface of the pole body, the upper side of the plastic body has a first recess with an outward opening for clamping the welding ring, and the lower inner side of the welding ring has a second recess with an inward opening for clamping the lower side convex part of the pole body.

[0011] Further, the inner wall of the plastic body abuts against the surface of the pole body.

[0012] Further, the lowermost end of the plastic body abuts against the bottom edge, and the distance between the lowermost end of the plastic body and the bottom surface of the pole body is 0.7±0.05mm.

[0013] Further, the compression amount of the sealing ring is 0.7±0.125mm, the diameter of the sealing ring is smaller than the diameter of the plastic body, the lower surface of the sealing ring abuts against the bottom edge, and the upper surface of the sealing ring abuts against the lower end of the pole body.

[0014] Further, the pole body has two kinds, namely a positive pole and a negative pole, and the plastic body has two kinds, namely a conductive plastic sleeved on the positive pole and an insulating plastic sleeved on the negative pole.

[0015] Further, the lower side of the top cover sheet has a connecting hole, the upper surface of the lower plastic has a connecting column corresponding to the connecting hole, and the connecting hole and the connecting column are inserted to fix the top cover sheet and the lower plastic.

[0016] Compared with the prior art, the application has the advantages that the welding ring and the pole body are separately injection molded to form the plastic body, and then the plastic body is welded with the top cover sheet, thereby solving the problem of easy deformation of the pole body and the welding ring. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of a top cover structure;

[0018] Figure 2 is an exploded schematic view of a top cover structure;

[0019] Figure 3 is a sectional view of a top cover sheet;

[0020] Figure 4 is a sectional view of a top cover structure;

[0021] Figure 5 is a schematic view of the connection between a top cover sheet and a lower plastic;

[0022] In the figure, 1 is a top cover sheet, 11 is an inclined surface, 12 is a connecting seat, 13 is a bottom edge, 14 is a welding hole, 15 is a connecting hole, 2 is a lower plastic, 21 is a connecting column, 31 is a positive pole, 311 is a conductive plastic, 3111 is a first groove, 3112 is a second groove, 32 is a negative pole, 321 is an insulating plastic, 4 is an explosion-proof valve film, 41 is an explosion-proof valve, 5 is a welding ring, and 6 is a sealing ring. DETAILED DESCRIPTION

[0023] The following is a specific embodiment of the application and further describes the technical scheme of the application in combination with the drawings.

[0024] As Figures 1-5As shown, a battery top cover structure includes a pole body, a sealing ring 6, a top cover sheet 1 and a lower plastic 2, the top cover sheet 1 is fixedly attached to the lower plastic 2, two welding holes 14 are formed in the top cover sheet 1 for mounting the pole body and the welding holes 14 penetrate the lower plastic 2, the sealing ring 6 is mounted below the pole body, characterized in that,

[0025] The pole body is externally injection molded with an annular plastic body and is connected with a welding ring 5, the plastic body abuts against the inner wall of the welding hole 14 and the surface of the pole body, and the welding ring 5 is welded and fixed with the welding hole 14.

[0026] Further, the middle part of the top cover sheet 1 is mounted to the explosion-proof valve 41 and the explosion-proof valve 41 sticker film 4 is attached thereto.

[0027] Further, the welding hole 14 of the top cover sheet 1 has an annular connecting seat 12, the inner wall of the connecting seat 12 has a slope 11 and the lower end of the welding ring 5 has a certain distance from the slope 11, and the welding ring 5 is welded with the inner wall of the connecting seat 12. By arranging a slope 11 on the inner wall of the connecting seat 12 of the top cover sheet 1, the laser welding can be prevented from penetrating through the gap and burning the plastic body. At the same time, the welding ring 5 is positioned and welded with the connecting seat 12 of the top cover sheet 1, which ensures the center distance and avoids the pole body being pressed. Compared with the traditional positioning method, the structure of the positioning sheet is saved and the cost is saved.

[0028] Further, the bottom of the welding hole 14 of the top cover sheet 1 has an inwardly extending bottom edge 13 for abutting against the sealing ring 6. The sealing ring 6 is placed alone on the bottom edge 13 of the welding hole 14 of the top cover sheet 1, which avoids air leakage caused by poor welding such as welding holes.

[0029] Further, the pole body is convex, the plastic body is sleeved on the outer surface of the pole body, the upper side of the plastic body has a first recess 3111 with an outward opening for clamping the welding ring 5, and the lower inner side of the welding ring 5 has a second recess 3112 with an inward opening for clamping the lower side convex part of the pole body.

[0030] Further, the inner wall of the plastic body abuts against the surface of the pole body. The positioning sheet is removed in the present application, the plastic body abuts against the surface of the pole body, the contact area is increased, the conductive area of the positive pole 31 is increased, the resistance value in the production process is more stable, and the yield is improved.

[0031] Further, the lowermost end of the plastic body abuts against the bottom edge 13, and the distance between the lowermost end of the plastic body and the bottom surface of the pole body is 0.7±0.05mm.

[0032] Further, the compression amount of the sealing ring 6 is 0.7±0.125mm, the diameter of the sealing ring 6 is smaller than the diameter of the plastic body, and the lower surface of the sealing ring 6 abuts against the bottom edge 13, and the upper surface of the sealing ring 6 abuts against the lower end of the pole body.

[0033] Further, the pole body has two kinds, namely the positive pole 31 and the negative pole 32, and the plastic body has two kinds, namely the conductive plastic 311 sleeved on the positive pole 31 and the insulating plastic 321 sleeved on the negative pole 32.

[0034] Further, the lower side of the top cover sheet 1 has a connecting hole 15, the upper surface of the lower plastic 2 has a connecting column 21 corresponding to the connecting hole 15, and the connecting hole 15 and the connecting column 21 are inserted to fix the top cover sheet 1 and the lower plastic 2.

[0035] The battery top cover structure firstly installs the pole body and the welding ring 5, separately injection-molds the plastic body to combine the pole body and the welding ring 5, then installs the pole body into the welding hole 14 to make the welding ring 5 contact with the connecting seat 12, performs welding operation, abuts the sealing ring 6 against the bottom edge 13 of the welding hole 14 before welding to provide the lower end surface of the pole body to abut against, and compresses the sealing ring 6 to realize sealing after welding, so that the battery top cover structure firstly welds the welding ring 5 and the pole body through separate injection molding, and then welds on the top cover sheet 1, which accelerates the production capacity compared with the traditional injection molding process of the top cover sheet 1.

[0036] The technical scheme of the battery top cover structure provided by the application is significantly different from the prior art, and the parts not involved in the technical scheme of the application are the same as or can be realized by the prior art, and thus will not be described herein.

[0037] The technical scheme in the above embodiments has clearly and completely described the content of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

Claims

1. A battery top cover structure, comprising a pole, a sealing ring, a top cover sheet, and a lower plastic, wherein the top cover sheet is fixedly attached to the lower plastic, the top cover sheet is provided with two welding holes for mounting the pole, and the welding holes penetrate the lower plastic, the sealing ring is mounted below the pole, and is characterized in that: An annular plastic body is injection-molded on the outside of the pole body and a welding ring is connected via the plastic body. The plastic body abuts against the inner wall of the welding hole and the surface of the pole body, and the welding ring is fixed to the welding hole by welding.

2. The battery top cover structure according to claim 1, characterized in that: The middle part of the top cover sheet is installed on the explosion-proof valve and an explosion-proof valve film is pasted on it.

3. The battery top cover structure according to claim 1, characterized in that: The welding hole of the top cover sheet is provided with an annular connecting seat, the inner wall of the connecting seat is provided with an inclined surface, and a certain distance is provided between the lower end of the welding ring and the inclined surface, and the welding ring is welded to the inner wall of the connecting seat.

4. The battery top cover structure according to claim 3, characterized in that: The bottom of the welding hole of the top cover plate has a bottom edge which extends inwards and is for the sealing ring to abut against.

5. The battery top cover structure according to claim 4, characterized in that: The pole body is convex, and the plastic body is sleeved on the outer surface of the pole body. The upper side of the plastic body has a first groove with an opening facing outward for the welding ring to be engaged, and the lower inner side of the welding ring has a second groove with an opening facing inward to engage the convex part of the lower side of the pole body.

6. The battery top cover structure according to claim 1, characterized in that: The inner wall of the plastic body is in contact with the surface of the pole body.

7. The battery top cover structure according to claim 4, characterized in that: The lowermost end of the plastic body abuts against the bottom edge, and the distance between the lowermost end of the plastic body and the bottom surface of the pole body is 0.7±0.05 mm.

8. The battery top cover structure according to claim 7, characterized in that: The compression amount of the sealing ring is 0.7±0.125 mm, the diameter of the sealing ring is smaller than the diameter of the plastic body, the lower surface of the sealing ring abuts against the bottom edge, and the upper surface of the sealing ring abuts against the lower end of the pole body.

9. The battery top cover structure according to claim 6, characterized in that: The pole body has two types, namely a positive pole and a negative pole. The plastic body has two types, namely a conductive plastic sleeved on the positive pole and an insulating plastic sleeved on the negative pole.

10. The battery top cover structure according to claim 1, characterized in that: The lower side of the top cover sheet is provided with a connecting hole, the upper surface of the lower plastic is provided with a connecting column corresponding to the connecting hole, and the connecting hole and the connecting column are plugged into each other to fix the top cover sheet and the lower plastic.

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