Top cover plate structure of ultra-thin pole of square battery

Abstract

The utility model discloses a top cover plate structure of an ultra-thin pole of a square battery, which relates to the technical field of batteries and comprises a top cover plate, a positive pole assembly, a negative pole assembly and a sealing assembly, a positive pole assembly hole and a negative pole assembly hole are symmetrically arranged at two ends of the top cover plate, and the sealing assembly and the positive pole assembly are sequentially assembled in the positive pole assembly hole. A sealing assembly and a cathode assembly are sequentially assembled in the cathode assembly hole, an anti-explosion hole is fixedly formed in the center of the top cover plate, an anti-explosion valve is arranged in the anti-explosion hole, an anti-explosion valve protection patch is fixedly arranged on the upper surface of the anti-explosion valve, and a matched lower insulating plate is fixed below the top cover plate through a hot melting technology. C-shaped rubber coating openings are formed in the ultra-thin positive pole and the ultra-thin negative pole, rubber coating of the pole is facilitated, a protrusion is designed at the bottom of the pole, the protruding part is embedded into a notch of the top cover piece, then the torsion of the top cover is improved, the size of the pole is compressed through the ultra-thin positive pole and the ultra-thin negative pole, the capacity space of a battery cell is increased, and the energy density of the battery cell is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically a square battery extremely thin pole top cover plate structure. BACKGROUND

[0002] Battery top cover technology is a key technology in the field of battery manufacturing, especially in the electric vehicle and new energy vehicle industry, the design and manufacturing of battery top cover have a crucial influence on the safety, performance and life of the battery. As the external protective layer of the battery pack, the battery top cover needs to have high strength, light weight and corrosion resistance and other characteristics. It not only needs to protect the battery inside from the damage of the external environment, but also needs to play the role of power-off protection and active valve opening pressure reduction when the battery fails.

[0003] In the prior art, the positive and negative poles usually penetrate the top cover plate on both sides, the positive and negative poles are large in size, thereby causing the problems of high cost and low energy density of the battery cell, and the number of required top cover production parts is large, the assembly efficiency of the production line is low, and it is difficult to meet the size tolerance requirement after assembly. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a square battery extremely thin pole top cover plate structure to solve the above problems.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A square battery extremely thin pole top cover plate structure, including top cover plate, positive electrode assembly, negative electrode assembly, sealing assembly, the both ends of top cover plate are symmetrically provided with positive electrode assembly hole and negative electrode assembly hole, the sealing assembly and the positive electrode assembly are sequentially assembled in the positive electrode assembly hole, the sealing assembly and the negative electrode assembly are sequentially assembled in the negative electrode assembly hole, the central part of top cover plate is fixedly provided with explosion-proof hole, the explosion-proof valve is arranged in the explosion-proof hole, the upper surface of explosion-proof valve is fixedly provided with explosion-proof valve protection patch, the lower part of top cover plate is fixed with adaptive lower insulating plate by hot melting process.

[0007] As a further scheme of the utility model: the positive electrode assembly includes extremely thin positive pole and positive electrode upper plastic, the extremely thin positive pole is in the shape of a thin sheet circle, four C-shaped glue covering openings are symmetrically arranged on the periphery of the extremely thin positive pole, and the extremely thin positive pole is sleeved in the positive electrode upper plastic.

[0008] As a further scheme of the utility model: the bottom of the extremely thin positive pole is provided with a first positive electrode protrusion with a certain width in the central part, and the bottom of the extremely thin positive pole is provided with a first positive electrode groove for placing a welding pressure ring at a certain distance from the first positive electrode protrusion.

[0009] As a further scheme of the utility model: four first arc-shaped protrusions are symmetrically arranged on the upper surface of the positive electrode assembly hole.

[0010] As a further scheme of the utility model: the negative electrode assembly comprises an extremely thin negative electrode column and a negative electrode upper plastic, the extremely thin negative electrode column is in a sheet circular shape, four C-shaped glue covering openings are symmetrically arranged on the periphery of the extremely thin negative electrode column, and the extremely thin negative electrode column is sleeved in the negative electrode upper plastic.

[0011] As a further scheme of the utility model: a first negative electrode protrusion with a certain width is arranged at the bottom center of the extremely thin negative electrode column, and a first negative electrode groove for placing a welding pressure ring is arranged at the bottom of the extremely thin negative electrode column at a certain distance from the first negative electrode protrusion.

[0012] As a further scheme of the utility model: the extremely thin negative electrode column is composed of aluminum and copper, the top of the extremely thin negative electrode column is made of aluminum, and the bottom of the extremely thin negative electrode column is made of copper.

[0013] As a further scheme of the utility model: four second arc-shaped protrusions are symmetrically arranged on the upper surface of the negative electrode assembly hole.

[0014] As a further scheme of the utility model: two welding pressure ring holes are arranged on the lower insulating plate corresponding to the positive electrode assembly hole and the negative electrode assembly hole, and welding pressure rings are arranged in the welding pressure ring holes.

[0015] As a further scheme of the utility model: the welding pressure ring is in a circular ring shape, and a sheet extending outward is arranged around the bottom of the circular ring of the welding pressure ring.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1、In the utility model, the volume of the pole is compressed by the extremely thin positive electrode column and the extremely thin negative electrode column, thereby reducing the production cost of the positive and negative electrode columns, compressing the physical space of the top cover assembly, improving the capacity space of the battery cell, and increasing the energy density of the battery cell.

[0018] 2、In the utility model, the C-shaped glue covering openings are arranged on the extremely thin positive electrode column and the extremely thin negative electrode column, which facilitates the glue covering of the pole, and the protrusions are designed at the bottom of the pole, and the protruding parts are embedded in the top cover sheet slot, thereby improving the torsion of the top cover

[0019] 3、In the utility model, the reverse welding is adopted, that is, the welding pressure ring is arranged at the bottom of the lower insulating plate to fix the entire top cover sheet, and the sealing ring is compressed, thereby achieving the sealing effect, compressing the volume of the top cover assembly, and further improving the energy density of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of the utility model;

[0021] Figure 2 It is a sectional view schematic view of the positive electrode assembly in the utility model;

[0022] Figure 3 It is a sectional view schematic view of the negative electrode assembly in the utility model;

[0023] Figure 4 It is a three-dimensional assembly drawing of the positive electrode assembly in the utility model;

[0024] Figure 5 It is a three-dimensional assembly drawing of the negative electrode assembly in the utility model

[0025] In the drawing: 11, very thin positive electrode column; 12, positive electrode upper plastic; 13, positive electrode assembly hole; 21, very thin negative electrode column; 22, negative electrode upper plastic; 23, negative electrode assembly hole; 31, explosion-proof hole; 32, explosion-proof valve; 33, explosion-proof protection patch; 4, sealing ring; 5, top cover plate; 6, lower insulating plate; 7, welded pressure ring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0027] Please refer to Figures 1-5 In the embodiments of the utility model, a square battery very thin pole top cover plate structure comprises a top cover plate 5, a positive electrode assembly, a negative electrode assembly and a sealing assembly 4. Positive electrode assembly holes 13 and negative electrode assembly holes 23 are symmetrically formed at both ends of the top cover plate 5. The sealing assembly 4 and the positive electrode assembly are sequentially assembled in the positive electrode assembly holes 13. The sealing assembly 4 and the negative electrode assembly are sequentially assembled in the negative electrode assembly holes 23. An explosion-proof hole 31 is fixedly formed in the center of the top cover plate 5. An explosion-proof valve 32 is arranged in the explosion-proof hole 31. An explosion-proof valve protection patch 33 is fixedly arranged on the upper surface of the explosion-proof valve 32. An adaptive lower insulating plate 6 is fixedly arranged below the top cover plate 5 by a hot melting process.

[0028] The positive electrode assembly comprises a very thin positive electrode column 11 and a positive electrode upper plastic 12. The very thin positive electrode column 11 is in the shape of a thin sheet circle. Four C-shaped rubber coating openings are symmetrically formed around the very thin positive electrode column 11. The very thin positive electrode column 11 is sleeved in the positive electrode upper plastic 12.

[0029] The bottom of the extremely thin positive pole is provided with a first positive protrusion with a certain width in the middle.

[0030] The upper surface of the positive assembly hole is symmetrically provided with four first arc-shaped protrusions with a certain interval.

[0031] The extremely thin negative pole is made of aluminum and copper, the top of the extremely thin negative pole is made of aluminum, and the bottom of the extremely thin negative pole is made of copper.

[0032] The bottom of the extremely thin negative pole is provided with a first negative protrusion with a certain width in the middle.

[0033] The extremely thin negative pole is made of aluminum and copper, the top of the extremely thin negative pole is made of aluminum, and the bottom of the extremely thin negative pole is made of copper.

[0034] The upper surface of the negative assembly hole is symmetrically provided with four second arc-shaped protrusions with a certain interval.

[0035] The lower insulating plate is provided with two welding ring holes corresponding to the positive assembly hole and the negative assembly hole, and the welding ring holes are respectively provided with welding rings.

[0036] The welding ring is in the shape of a ring, and the bottom of the ring is provided with a thin sheet extending outward.

[0037] The positive pole is thinned to form an extremely thin positive pole, and the extremely thin positive pole is coated with a positive upper plastic to form a positive assembly. Similarly, the extremely thin negative pole is coated with a negative upper plastic to form a negative assembly. The positive assembly, the negative assembly and the sealing ring are respectively assembled with the positive assembly hole and the negative assembly hole in the top cover plate. The central part of the top cover plate is also provided with an explosion-proof valve and an explosion-proof patch. The bottom of the top cover plate is assembled with the lower insulating plate and is fixed by heat melting. The lower insulating plate is provided with holes corresponding to the positive assembly hole and the negative assembly hole for placing welding rings. The welding rings are respectively welded and fixed with the positive assembly and the negative assembly. The sealing ring is compressed to achieve sealing effect.

[0038] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A square battery extremely thin and extremely pillar top cover plate structure, comprising a top cover plate (5), a positive electrode assembly, a negative electrode assembly, a sealing assembly (4), characterized in that: The top cover plate (5) is symmetrically provided with a positive assembly hole (13) and a negative assembly hole (23) at both ends, the positive assembly hole (13) is sequentially provided with the sealing assembly (4) and the positive assembly, the negative assembly hole (23) is sequentially provided with the sealing assembly (4) and the negative assembly, the central part of the top cover plate (5) is fixedly provided with an explosion-proof hole (31), the explosion-proof hole (31) is provided with an explosion-proof valve (32), the upper surface of the explosion-proof valve (32) is fixedly provided with an explosion-proof valve protection patch (33), and the lower part of the top cover plate (5) is fixedly provided with a matched lower insulating plate (6) by a hot melting process.

2. The square battery pole thin top cover plate structure according to claim 1, characterized in that: The positive assembly comprises an extremely thin positive pole (11) and a positive upper plastic (12), the extremely thin positive pole (11) is in a sheet circular shape, four C-shaped glue covering openings are symmetrically provided on the periphery of the extremely thin positive pole (11), and the extremely thin positive pole (11) is sleeved in the positive upper plastic (12).

3. The square battery pole thin top cover plate structure according to claim 2, characterized in that: A first positive protrusion with a certain width is arranged at the bottom of the extremely thin positive pole (11), and a first positive groove for placing a welding pressure ring (7) is arranged at a certain distance from the first positive protrusion.

4. The square battery extremely thin and extremely short post top cover plate structure according to any one of claims 1-3, characterized in that: Four first arc-shaped protrusions are symmetrically provided on the upper surface of the positive assembly hole (13), and there is a certain interval between the first arc-shaped protrusions.

5. The square battery pole thin top cover plate structure according to claim 1, characterized in that: The negative assembly comprises an extremely thin negative pole (21) and a negative upper plastic (22), the extremely thin negative pole (21) is in a sheet circular shape, four C-shaped glue covering openings are symmetrically provided on the periphery of the extremely thin negative pole (21), and the extremely thin negative pole (21) is sleeved in the negative upper plastic (22).

6. The square battery pole thin top cover plate structure according to claim 5, characterized in that: A first negative protrusion with a certain width is arranged at the bottom of the extremely thin negative pole (21), and a first negative groove for placing a welding pressure ring (7) is arranged at a certain distance from the first negative protrusion.

7. The square battery pole thin top cover plate structure according to claim 6, characterized in that: The extremely thin negative pole (21) is composed of aluminum and copper, the top part of the extremely thin negative pole (21) is made of aluminum, and the bottom part of the extremely thin negative pole (21) is made of copper.

8. The square battery pole thin top cover plate structure according to claim 1, characterized in that: Four second arc-shaped protrusions are symmetrically provided on the upper surface of the negative assembly hole (23), and there is a certain interval between the second arc-shaped protrusions.

9. The square battery pole thin top cover plate structure according to claim 1, characterized in that: The lower insulating plate (6) is provided with two welding pressure ring holes corresponding to the positive assembly hole (13) and the negative assembly hole (23), and a welding pressure ring (7) is arranged in each welding pressure ring hole.

10. The square battery pole thin top cover plate structure according to claim 9, characterized in that: The welding pressure ring (7) is in a circular ring shape, and a sheet extending outward is arranged around the bottom circular ring of the welding pressure ring (7).

Images