CN-119050495-B - Cylindrical full-tab battery and preparation method thereof

Abstract

A cylindrical full-tab battery and a preparation method thereof belong to the technical field of secondary batteries. The cylindrical all-tab battery comprises a current collecting cover, an all-tab winding core, a cylindrical conductive shell with one open end and used for winding the core into the shell and filling electrolyte, and an insulating ring for isolating and insulating the cylindrical conductive shell at the open end and the current collecting cover, wherein the all-tab winding core is provided with an anode tab end and a cathode tab end at two axial ends, one tab end is welded with the current collecting cover, and the other tab end is welded with the closed end and the all-tab winding core. The invention can improve the product performance and the product production efficiency.

Inventors

• LIU LIBO
• LI HUIJIA
• LI HONG

Assignees

• 广纳铭尚新能源科技(苏州)有限公司

Dates

Publication Date

20260508

Application Date

20240906

Claims (7)

1. 1. The preparation method of the cylindrical all-lug battery is characterized by comprising the following steps of: The method comprises the steps of respectively coating positive electrode active materials and negative electrode active materials on two electrode plate substrates to prepare a first electrode plate and a second electrode plate, wherein one of the first electrode plate and the second electrode plate is used as the positive electrode plate and provided with a positive electrode active material region and a positive electrode blank region, and the other is used as the negative electrode plate and correspondingly provided with a negative electrode active material region and a negative electrode blank region; Cell rolling groove: the winding core is put into the shell and then grooved; Welding the positive electrode tab end, namely welding and fixing the positive electrode tab end of the full-tab winding core with the current collecting cover through electromagnetic pulse welding, and sleeving an insulating ring after welding the positive electrode tab end with the current collecting cover; welding the negative electrode tab end, namely welding and fixing the negative electrode tab end of the full-tab winding core with the cylindrical conductive shell through electromagnetic pulse welding; filling electrolyte, namely filling the electrolyte into a gap between the cylindrical conductive shell and the current collecting cover after welding the positive electrode tab end and the negative electrode tab end; sealing the cylindrical conductive shell and the current collecting cover after filling electrolyte; forming the battery with the sealed package to obtain a cylindrical full-tab battery; the electromagnetic pulse welding process comprises the steps of welding current of 200-1000 kA, voltage of 10-16 kV and frequency of 10-15 kHz.
2. 2. The method according to claim 1, wherein the pressure of the electrolyte is 0.1 to 0.9kgf/m 2 .
3. 3. The method of manufacturing according to claim 1, wherein the current collecting cover comprises: The conducting cover body is internally fixed with a lining, a closed space is formed between the conducting cover body and the lining, and an explosion-proof structure is arranged on the lining; and the collecting ring is fixedly connected with the conductive cover body and is sealed by a sealing piece.
4. 4. The method according to claim 3, wherein the explosion-proof structure comprises a pressure relief hole and an explosion-proof sheet, the pressure relief hole is formed in the lining, and the explosion-proof sheet is arranged on one side of the pressure relief hole away from the closed space.
5. 5. The method of claim 3, wherein the liner is welded to one tab end of the full tab winding core.
6. 6. The method of claim 1, wherein the tab end welded to the manifold cap has a width equal to a width of the manifold ring.
7. 7. A cylindrical full tab battery characterized by being manufactured by the manufacturing method of any one of claims 1 to 6.

Description

Cylindrical full-tab battery and preparation method thereof Technical Field The invention relates to a technology in the field of secondary batteries, in particular to a cylindrical full-tab battery and a preparation method thereof. Background Cylindrical batteries are excellent in battery uniformity, energy density, durability, and the like, and have wide application in various fields. In particular to a cylindrical full-tab battery which has higher power performance and wider application field. As such, the structural design and manufacturing requirements for cylindrical batteries are also high. The current collecting cover plate structure of the cylindrical battery comprises an insulating part, a lug welding switching piece and other structures, and the working procedures of lug flattening or cutting and stacking, switching piece welding, switching piece bending, welding sealing and the like are required to be completed in the manufacturing of the battery, so that the operation is complex, and the influence on the production efficiency is large. The rubbing and folding process is easy to rub the diaphragm and further cause self-discharge and short circuit of the battery, the cutting and folding process needs to increase equipment for cutting and stacking the electrode lugs by laser, the cost is increased, welding slag is easy to generate in the electrode lugs by laser cutting to cause internal short circuit and self-discharge of the battery, rubbing and folding surfaces and current collector adapter pieces are required to be welded, the internal short circuit and the self-discharge of the battery are easy to be caused by burning the diaphragm and residual welding slag, and metal welding slag is easy to generate in the welding process of the electrode lugs, so that the problems of self-discharge, short circuit and the like of the cylindrical battery are solved, and the problems of poor consistency and reduced durability of the battery are important primes. The present invention has been made to solve the above-mentioned problems occurring in the prior art. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a cylindrical all-tab battery and a preparation method thereof, which can improve the product performance and the production efficiency. The invention relates to a cylindrical full-tab battery, comprising: a collecting cover; The full-tab winding core is provided with a positive tab end and a negative tab end at two axial ends, wherein one tab end is welded with the current collecting cover; The cylindrical conductive shell is arranged at the opening end and the current collecting cover in a closed way and is isolated and insulated through an insulating ring, and the closed end is welded and connected with the other tab end on the full tab winding core. In some preferred embodiments, the current collecting cover includes a conductive cover body and a current collecting ring; a lining is fixed on the inner side of the conductive cover body, a closed space is formed between the lining and the conductive cover body, and an explosion-proof structure is arranged on the lining; the collecting ring is fixedly connected with the conductive cover body and is sealed by a sealing piece. In some preferred embodiments, the explosion-proof structure comprises a pressure release hole and an explosion-proof piece, the pressure release hole is arranged on a lining, the explosion-proof piece is arranged on one side of the pressure release hole away from the closed space, the aperture size of the pressure release hole is designed according to the battery capacity and the explosion-proof pressure, the explosion-proof piece releases pressure to the outside of the closed space through the pressure release hole when the explosion-proof piece is subjected to pressure blasting, so that the explosion of the battery is prevented, and preferably, the lining is welded and connected with one tab end of the full tab winding core. In some preferred embodiments, the tab end, which is welded to the manifold cap, has a width that matches the width of the manifold ring. Preferably, the width of the tab end is the same as that of the collector ring, and the thickness of the collector ring is preferably 0.3-0.5 mm, for example, 0.3mm, 0.4mm, 0.5mm, etc. In some preferred embodiments, the full-tab winding core comprises a first diaphragm, a first electrode plate, a second diaphragm and a second electrode plate which are arranged in a stacked mode and wound, wherein one of the first electrode plate and the second electrode plate is used as a positive electrode plate and provided with a positive electrode active material area and a positive electrode blank area, the other one of the first electrode plate and the second electrode plate is used as a negative electrode plate and correspondingly provided with a negative electrode active material area and a negative electrode blank area, the positive electrode bl