WO2023070949A1

WO2023070949A1 - Integrated electrode structure capable of rapid curing and sealing, and manufacturing method therefor

Info

Publication number: WO2023070949A1
Application number: PCT/CN2022/071441
Authority: WO
Inventors: 陈喻斯
Original assignee: 广东维都利新能源有限公司
Priority date: 2021-10-27
Filing date: 2022-01-11
Publication date: 2023-05-04
Also published as: CN114050362A

Abstract

The present invention discloses an integrated electrode structure capable of rapid curing and sealing, comprising an integrated electrode body. The integrated electrode body comprises a positive electrode made from a first metal conductor, and a negative electrode made from a second metal conductor. The negative electrode is arranged above the positive electrode. An insulating layer is coated between the positive electrode and the negative electrode. The insulating layer is rapidly cured by using a curing device. The cured insulating layer, the positive electrode and the negative electrode together form the integrated electrode body. A housing is welded and fixed below the integrated electrode body. A battery cell is arranged between the integrated electrode body and the housing. One end of the battery cell is provided with a positive tab, and the other end is provided with a negative tab. The positive electrode is fixedly connected to the positive tab, and the negative electrode is fixedly connected to the negative tab. By means of the present invention, manufacturing time is saved, manufacturing efficiency is improved, the yield of the battery is improved, the rate of rejection caused by sealing is reduced, and the method is suitable for batch production.

Description

A fast curing and sealing integrated electrode structure and manufacturing method

technical field

The invention relates to the technical field of lithium battery electrodes, in particular to a rapidly solidified and sealed integrated electrode structure and a manufacturing method.

Background technique

In order to seal the electrolyte in the existing steel case batteries, a sealing rubber ring is usually installed between the positive electrode case cover and the negative electrode. The sealing rubber ring not only prevents the internal electrolyte from flowing out, but also prevents Conductive media such as water droplets from the outside enter the inside of the battery, and at the same time play an insulating role, that is, to prevent the conduction between the positive electrode case cover and the negative electrode electrode. However, the manufacture of the sealing rubber ring is complicated, the waterproof performance is still limited, and the sealing effect is not good. There is still a very big security risk.

In addition, in the process of assembling the positive cover, the negative electrode and the sealing rubber ring, it is necessary to separately perform riveting, ceramic sintering, glue pressing, and sealing of a sealing rubber ring placed between the positive cover and the negative electrode. Sealing technology such as apron pier seal buckle edge; the above-mentioned processes have low working efficiency, long production cycle, and easy wear and tear between parts. Among them, the pier seal and riveting are achieved by mechanical extrusion, and the seal is prone to mechanical chronic rebound leakage. High-temperature ceramics The sintering and sealing cycle is long, the high temperature sintering causes the deformation of the parts and the variation of the density of the parts, the process is complicated, the cost is high, the efficiency is slow, and the time is long.

At the same time, in the process of pier sealing and riveting, the positive cover and the negative electrode are likely to be pressed too deeply under the condition of excessive external force, resulting in mechanical damage, thus directly squeezing the battery core, resulting in the failure of the battery core. The damage of the battery will lead to the risk of powder falling off inside the battery and short circuit.

technical solution

The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and provide a fast curing and sealing integrated electrode structure and manufacturing method; save manufacturing time, improve manufacturing efficiency, improve battery yield, and reduce scrap due to sealing rate, suitable for mass production.

To achieve the above object, the present invention provides a fast-curing and sealed integrated electrode structure, including an integrated electrode body, which includes a positive electrode made of a first metal conductor and a negative electrode made of a second metal conductor An electrode, a negative electrode is installed above the positive electrode, and an insulating layer is coated between the positive electrode and the negative electrode; the insulating layer is quickly cured by a curing device; the cured insulating layer, positive electrode and The negative electrodes together form an integrated electrode body; a housing is welded and fixed under the integrated electrode body; a battery cell is installed between the integrated electrode body and the housing; a positive ear is installed at one end of the battery cell, and a A negative electrode ear is provided, the positive electrode is fixedly connected to the positive electrode ear, and the negative electrode is fixedly connected to the negative electrode ear.

Preferably, the insulating layer is made of a shadowless adhesive material member, a sealant material member, an epoxy resin material member or an adhesive material member; it is coated between the positive electrode and the negative electrode by spraying, dripping or smearing .

Preferably, a heating component and an ultraviolet emitting component are installed inside the curing device; the insulating layer can be quickly cured.

Preferably, 50 to 100 integrated electrode bodies are accommodated inside the curing device.

Preferably, the integrated electrode body is mounted on a steel-cased cylindrical battery, a steel-cased prismatic battery and a steel-cased needle-shaped battery.

Preferably, the integrated electrode body and the housing are connected by external peripheral welding; a weld seam is formed between the electrode body and the housing.

Preferably, the positive electrode includes a ring-shaped positive electrode side and a convex positive electrode in the middle; An annular insulating layer is installed between the negative electrodes; the upper surface of the middle convex positive electrode is higher than the upper surface of the negative electrode; the outer diameter of the side of the annular positive electrode is smaller than the outer diameter of the annular insulating layer, and the annular The outer diameter of the side of the positive electrode is larger than the inner diameter of the annular insulating layer, and the outer diameter of the annular insulating layer is smaller than the outer diameter of the negative electrode; a shell is welded and fixed under the negative electrode.

Preferably, a groove is provided at the bottom of the middle convex positive electrode; an insulating protrusion is provided on one side of the annular insulating layer, and a negative electrode is installed on one side of the insulating protrusion; the top of the insulating protrusion is The surface is flush with the top surface of the negative electrode.

Preferably, the positive electrode is a ring-shaped positive electrode; the negative electrode is circular, and a circular negative electrode is installed above the ring-shaped positive electrode; a circular negative electrode is installed between the circular positive electrode and the circular negative electrode. Annular insulating layer; the outer diameter of the annular positive electrode is greater than the outer diameter of the annular insulating layer, the inner diameter of the annular positive electrode is smaller than the inner diameter of the annular insulating layer, and the circular negative electrode is greater than the inner diameter of the annular insulating layer; smaller than the annular insulating layer The outer diameter of the layer, the shell is welded and fixed under the annular positive electrode.

The present invention also provides a method for manufacturing the aforementioned fast-curing and sealed integrated electrode structure, comprising the following steps:

Step S1: using the first metal conductor to punch and press a sheet-shaped positive electrode; using the second metal conductor to punch and press to make a sheet-shaped negative electrode;

Step S2: placing the negative electrode above the positive electrode; and coating an insulating layer between the negative electrode and the positive electrode;

Step S3: put the positive electrode, the negative electrode and the insulating layer together into the curing device to cure the insulating layer; obtain the integrated electrode body;

Step S4: An electric core is installed under the integrated electrode body; the positive lug on the electric core is welded and fixedly connected to the positive electrode, and the negative lug on the electric core is welded and fixedly connected to the negative electrode;

Step S5: a casing is welded and fixed under the integrated electrode body; and the cell is sealed.

Beneficial effect

1. The present invention integrates the positive electrode, the negative electrode and the insulating layer together to form an integrated electrode body, and as a component of the lithium battery, it is placed on the top of the lithium battery; the integrated electrode body is made modular; it is beneficial to the lithium battery As long as the battery cell is installed on the lower part of the integrated electrode body, and the shell is welded around the lower part of the integrated electrode body, the battery cell can be sealed to form a lithium battery. The electrode body can be mass-manufactured modularly. When connecting the sealed shell, it only needs to be welded around the shell; the connection is simple, which saves manufacturing time, improves manufacturing efficiency, improves the battery yield, and reduces the risk of damage due to sealing. The scrap rate is suitable for mass production.

2. The present invention is coated with an insulating layer between the positive electrode and the negative electrode; omits the step of compressing the sealing rubber ring between the positive electrode case cover and the negative electrode case cover in the prior art, improves the manufacturing process, and reduces The difficulty of manufacturing is reduced, so that the integrated electrode body can be mass-produced, without requiring individual press-fitting one by one as in the prior art; the production time is greatly saved, and the production efficiency is improved.

3. The insulating layer of the present invention is coated between the positive electrode and the negative electrode by spraying, dripping or smearing, and the insulating layer is made of thermosetting material or light curing material, and is equipped with heating components and ultraviolet rays inside. The curing device of the emitting part can quickly cure the insulating layer; the curing device can accommodate multiple integrated electrode bodies, and cure 50 to 100 integrated electrode bodies at a time, which can greatly reduce costs and improve production efficiency, and is more suitable for large quantities Production.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of an integrated electrode body provided by Embodiment 1 of the present invention;

2 is a schematic structural view of a lithium battery including an integrated electrode body provided by Embodiment 1 of the present invention;

Fig. 3 is a schematic structural view of the integrated electrode body provided by Embodiment 2 of the present invention;

4 is a schematic structural diagram of a lithium battery including an integrated electrode body provided by Embodiment 2 of the present invention;

Fig. 5 is a schematic structural view of the integrated electrode body provided by Embodiment 3 of the present invention;

FIG. 6 is a schematic structural view of a lithium battery including an integrated electrode body provided by Embodiment 3 of the present invention.

Included in the figure are:

1-integrated electrode body, 2-positive electrode, 3-negative electrode, 4-insulation layer, 6-shell, 5-cell, 51-positive ear, 52-negative ear, 7-welding seam, 21-ring positive electrode Electrode side, 22-middle convex positive electrode, 24-groove, 41-insulation protrusion, 25-ring positive electrode.

Embodiments of the present invention

The technical solutions in this embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in this embodiment of the present invention. Obviously, the described embodiment is an embodiment of the present invention, not all This embodiment. Based on this implementation manner in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

Embodiment one

Please refer to FIG. 1 and FIG. 2 , Embodiment 1 of the present invention provides a fast-curing and sealed integrated electrode structure.

As shown in Figure 1, the integrated electrode structure includes an integrated electrode body 1, and the integrated electrode body 1 includes a positive electrode 1 made by punching or integrally forming a first metal conductor and a positive electrode 1 made by punching or integrally forming a second metal conductor. Out of the negative electrode 3, the first metal conductor and the second metal conductor are generally different metal conductors, and may also be composite metal material components.

As shown in Figure 1, in this embodiment, a negative electrode 3 is installed above the positive electrode 2, and in other embodiments, a negative electrode 3 may also be installed below the positive electrode 2, in a word, the The upper and lower relationship between the positive electrode 2 and the negative electrode 3, as well as the definitions of the positive electrode 2 and the negative electrode 3 are easy to imagine, and can be interchanged, and can also be determined according to the actual situation. The present invention is not limited. All are protection scope of the present invention.

As shown in Figure 1, an insulating layer 4 is coated between the positive electrode 2 and the negative electrode 3; specifically, the insulating layer 4 is coated on the positive electrode 2 and the negative electrode 3 by spraying, dripping or smearing. In this way, manual or manipulator can be used to carry out batch coating, which is suitable for mass production and can save production time; the present invention adopts the technology of coating insulating layer; The steps between the positive electrode case cover and the negative electrode case cover improve the manufacturing process and reduce the manufacturing difficulty, so that the integrated electrode body 1 can be mass-produced without requiring individual press-fitting one by one as in the prior art; It greatly saves production time and improves production efficiency.

Further, the insulating layer 4 can be made of heat-curable material or light-curable material, so that it can be cured quickly under the conditions of light and heating; further, the insulating layer 4 is made of shadowless adhesive material components, sealant Material member, epoxy resin material member or adhesive material member; After the insulating layer 4 is coated between the positive electrode 2 and the negative electrode 3, it is put into a curing unit equipped with a heating part and an ultraviolet light emitting part as a whole. Fast curing is carried out in the device; thus, the cured insulating layer 4, positive electrode 2 and negative electrode 3 together form an integrated electrode body 1; further, the inside of the curing device can accommodate multiple integrated electrode bodies 1, once Curing 50 to 100 integrated electrode bodies can greatly reduce costs, improve production efficiency, and is more suitable for mass production.

As shown in Figure 2, a casing 6 is welded and fixed under the integrated electrode body 1; specifically, the integrated electrode body 1 and the casing 6 are connected by external peripheral welding; the electrode body 1 and the casing 6 to form a weld 7; further, the edge of the negative electrode 3 is welded together with the casing 6, so that the casing 6 is also the negative electrode of the lithium battery; further, the integrated electrode body 1 and the casing An electric core 5 is also installed between the bodies 6; one end of the electric core 5 is equipped with a positive pole ear 51, and the other end is equipped with a negative pole ear 52, and the positive electrode 2 is fixedly connected with the positive pole ear 51, and the negative pole ear 52 are fixedly welded on the bottom of the housing 6.

As shown in Figure 1, the positive electrode 2, the negative electrode 3 and the insulating layer 4 are integrated together to form an integrated electrode body 1, and as an integral part of the lithium battery, it is placed on the top of the lithium battery; thus, the integrated electrode body 1 Modularization; it is beneficial to the rapid assembly of the modularization of the lithium battery. Specifically, as long as the battery cell 5 is connected to the lower part of the integrated electrode body 1, and the casing 6 is welded around the lower part of the integrated electrode body 1, the battery can be assembled. The core 5 is sealed to form a lithium battery. With the above structure, batch modular manufacturing can be carried out when manufacturing the integrated electrode body 1. When connecting the sealed casing 6, only one circle of welding is required around the casing 6; the connection is simple, The manufacturing time is saved, the manufacturing efficiency is improved, the battery yield is improved, the scrap rate due to sealing is reduced, and it is suitable for mass production.

Specifically, the specific structure of the electrode body 1, as shown in Figure 1, the positive electrode 2 includes a ring-shaped positive electrode side 21 and a central convex positive electrode 22; the negative electrode 3 is ring-shaped, and the ring-shaped positive electrode A negative electrode 3 is installed above the electrode side 21, and an annular insulating layer 4 is installed between the annular positive electrode side 21 and the negative electrode 3; the upper surface of the middle convex positive electrode 22 is higher than the negative electrode 3 The upper surface of the upper surface; the outer diameter of the annular positive electrode side 21 is less than the outer diameter of the annular insulating layer 4, the outer diameter of the annular positive electrode side 21 is greater than the inner diameter of the annular insulating layer 4, and the outer diameter of the annular insulating layer 4 The outer diameter is smaller than that of the negative electrode 3 ; a casing 6 is welded and fixed below the negative electrode 3 .

In other embodiments, the integrated electrode body 1 is installed on a steel-cased cylindrical battery, a steel-cased prismatic battery, and a steel-cased needle-shaped battery.

Embodiment two

Please refer to FIG. 3 and FIG. 4 , Embodiment 2 of the present invention provides a fast-curing and sealed integrated electrode structure.

Embodiment 2 is basically the same as Embodiment 1, except that in order to reduce costs, the positive electrode 1 in this embodiment is produced by a stamping process. In order to better adapt to the stamping process, the positive electrode 1 has made certain adaptations. change; the bottom of the middle convex positive electrode 22 is also provided with a groove 24 formed after punching; it can also reduce the weight of the positive electrode 1 to a certain extent and reduce the manufacturing cost.

As shown in Figure 3; one side of the annular insulating layer 4 is provided with an insulating protrusion 41, and one side of the insulating protrusion 41 is provided with a negative electrode 3; further, the top surface of the insulating protrusion 41 is connected to the negative electrode 3. The top surface is flush; an insulating protrusion 41 is installed to block the negative electrode 3 from approaching the central convex positive electrode 22, which can prevent the negative electrode 3 from being connected to the central convex positive electrode 22, and reduce the occurrence of lithium battery short circuit. Improve the safety of lithium batteries.

Embodiment three

Referring to FIG. 5 and FIG. 6 , Embodiment 3 of the present invention provides a fast-curing and sealed integrated electrode structure.

The third embodiment is basically the same as the first embodiment, except that as shown in Figure 5; in order to further reduce the cost, the positive electrode 1 in this embodiment is produced by a stamping process, and the positive electrode 2 is a ring-shaped positive electrode 25; The negative electrode 3 is covered above the annular positive electrode 25 and is circular; an annular insulating layer 4 is arranged between the annular positive electrode 25 and the circular negative electrode 3; the outer diameter of the annular positive electrode 25 is larger than The outer diameter of the annular insulating layer 4, the inner diameter of the annular positive electrode 25 is smaller than the inner diameter of the annular insulating layer 4, and the circular negative electrode 3 is greater than the inner diameter of the annular insulating layer 4; less than the outer diameter of the annular insulating layer 4.

As shown in Figure 6; a housing 6 is welded and fixed below the annular positive electrode 25; thus the housing 6 is also the positive pole of the lithium battery; further, a device is installed between the integrated electrode body 1 and the housing 6 There is a battery cell 5; one end of the battery cell 5 is equipped with a positive pole ear 51, and the other end is equipped with a negative pole ear 52, the negative pole ear 52 is fixedly connected to the upper negative electrode 3, and the positive pole ear 51 is fixedly welded on the shell The bottom of body 6.

Embodiment four

Embodiment 4 of the present invention provides a method for manufacturing a fast-curing sealed integrated electrode structure as described in Embodiment 1, including the following steps.

Step S1: using the first metal conductor to stamp or integrally form the sheet-shaped positive electrode 1; using the second metal conductor to stamp or integrally form the sheet-shaped negative electrode 3.

Step S2: place the negative electrode 3 on the positive electrode 2; and coat the insulating layer 4 between the negative electrode 3 and the positive electrode 2.

Specifically, the insulating layer 4 is coated between the positive electrode 2 and the negative electrode 3 by spraying, dripping or smearing.

Further, the insulating layer 4 can be made of heat-curable material or light-curable material, so that it can be cured quickly under the conditions of light and heat.

Furthermore, the insulating layer 4 is made of shadowless glue material, sealant material, epoxy resin material or adhesive material.

Step S3: put the positive electrode 2, the negative electrode 3 and the insulating layer 4 into a curing device to cure the insulating layer 4; and obtain the integrated electrode body 1.

Specifically, after the insulating layer 4 is coated between the positive electrode 2 and the negative electrode 3, it is put into a curing device equipped with a heating component and an ultraviolet emitting component as a whole for rapid curing; thus, after the curing The insulating layer 4, the positive electrode 2 and the negative electrode 3 together form an integrated electrode body 1.

Further, the interior of the curing device can accommodate multiple integrated electrode bodies 1, and 50 to 100 integrated electrode bodies can be cured at one time, which can greatly reduce costs and improve production efficiency, and is more suitable for mass production.

Step S4: An electric core 5 is installed under the integrated electrode body 1; the positive ear 51 on the electric core 5 is welded and fixedly connected to the positive electrode 2, and the negative ear 52 on the electric core 5 is welded to the negative electrode 3 Fixed connection.

Specifically, since the positive electrode 2 and the negative electrode 3 in the integrated electrode body 1 block each other, it is inconvenient to simultaneously connect the positive electrode ear 51 and the negative electrode ear 52 to the positive electrode 2 and the negative electrode 3 installed above; Connect the positive tab 51 or the negative tab 52 to the lower end of the casing 6, so that the connection can be made more conveniently and the connection needs can be met.

Step S5: The casing 6 is welded and fixed under the integrated electrode body 1; the battery cell 5 is sealed.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims

A rapidly curing and sealed integrated electrode structure, characterized by comprising an integrated electrode body (1), the integrated electrode body (1) comprising a positive electrode (2) made of a first metal conductor and a positive electrode (2) made of a second metal conductor The prepared negative electrode (3), the negative electrode (3) is installed above the positive electrode (2), and an insulating layer (4) is coated between the positive electrode (2) and the negative electrode (3); The insulating layer (4) is rapidly cured by a curing device; the cured insulating layer (4), the positive electrode (2) and the negative electrode (3) together form an integrated electrode body (1); the integrated electrode body (1) The casing (6) is welded and fixed at the bottom; the battery cell (5) is installed between the integrated electrode body (1) and the casing (6); the positive electrode is installed at one end of the battery cell (5) The other end of the ear (51) is equipped with a negative ear (52), the positive electrode (2) is fixedly connected to the positive ear (51), and the negative electrode (3) is fixedly connected to the negative ear (52).
The fast-curing and sealed integrated electrode structure according to claim 1, characterized in that, the insulating layer (4) is made of a shadowless adhesive material member, a sealant material member, an epoxy resin material member or an adhesive material A component; coated between the positive electrode (2) and the negative electrode (3) by means of spraying, dripping or smearing.
The fast-curing and sealed integrated electrode structure according to claim 2, characterized in that a heating component and an ultraviolet emitting component are installed inside the curing device; and the insulating layer (4) is quickly cured.
The fast-curing and sealed integrated electrode structure according to claim 3, characterized in that 50 to 100 integrated electrode bodies (1) are accommodated inside the curing device.
The fast-curing and sealed integrated electrode structure according to claim 1, characterized in that the integrated electrode body (1) is installed on a steel-cased cylindrical battery, a steel-cased square battery and a steel-cased needle-shaped battery.
A fast-curing and sealed integrated electrode structure according to claim 1, characterized in that, the integrated electrode body (1) is connected to the shell (6) by means of external peripheral welding; the electrode body (1 ) and the shell (6) to form a weld (7).
A fast-curing and sealed integrated electrode structure according to claim 1, characterized in that, the positive electrode (2) includes a ring-shaped positive electrode side (21) and a convex positive electrode (22) in the middle; the negative electrode The electrode (3) is ring-shaped, and a negative electrode (3) is installed above the ring-shaped positive electrode side (21), and a ring-shaped insulation is installed between the ring-shaped positive electrode side (21) and the negative electrode (3). layer (4); the upper surface of the middle convex positive electrode (22) is higher than the upper surface of the negative electrode (3); the outer diameter of the annular positive electrode side (21) is smaller than that of the annular insulating layer (4) Outer diameter, the outer diameter of the annular positive electrode side (21) is larger than the inner diameter of the annular insulating layer (4), and the outer diameter of the annular insulating layer (4) is smaller than the outer diameter of the negative electrode (3); the negative electrode A casing (6) is welded and fixed under the electrode (3).
A fast-curing and sealed integrated electrode structure according to claim 7, characterized in that, a groove (24) is provided at the bottom of the middle convex positive electrode (22); the annular insulating layer (4) is a An insulating protrusion (41) is provided on one side, and a negative electrode (3) is installed on one side of the insulating protrusion (41); the top surface of the insulating protrusion (41) is flush with the top surface of the negative electrode (3).
The fast-curing and sealed integrated electrode structure according to claim 1, characterized in that, the positive electrode (2) is an annular positive electrode (25); the negative electrode (3) is circular, and the annular A circular negative electrode (3) is installed above the positive electrode (25); an annular insulating layer (4) is installed between the annular positive electrode (25) and the circular negative electrode (3); the annular positive electrode The outer diameter of (25) is larger than the outer diameter of the annular insulating layer (4), the inner diameter of the annular positive electrode (25) is smaller than the inner diameter of the annular insulating layer (4), and the circular negative electrode (3) is larger than the annular insulating layer The inner diameter of (4) is smaller than the outer diameter of the annular insulating layer (4), and the casing (6) is welded and fixed under the annular positive electrode (25).
A method for manufacturing a fast-curing sealed integrated electrode structure according to any one of claims 1 to 9, characterized in that it comprises the following steps:

Step S1: stamping a sheet-shaped positive electrode (1) using the first metal conductor; stamping and pressing a sheet-shaped negative electrode (3) using the second metal conductor;

Step S2; placing the negative electrode (3) above the positive electrode (2); and coating the insulating layer (4) between the negative electrode (3) and the positive electrode (2);

Step S3: put the positive electrode (2), the negative electrode (3) and the insulating layer (4) into the curing device to cure the insulating layer (4); obtain the integrated electrode body (1);

Step S4: a cell (5) is installed under the integrated electrode body (1); the positive tab (51) on the cell (5) is welded and fixedly connected to the positive electrode (2), and the cell ( 5) The negative electrode ear (52) on the top is welded and fixedly connected with the negative electrode (3);

Step S5: The casing (6) is welded and fixed under the integrated electrode body (1); the cell (5) is sealed.