Tab cutting device and method for soft package lithium battery

Abstract

The invention provides a tab cutting device and method for a soft package lithium battery, and relates to the field of lithium battery manufacturing. The device is composed of a cutter driving mechanism, a lower cutter mechanism, an upper cutter mechanism, a CCD mechanism and a bare battery cell feeding mechanism. A lower cutter base comprises a first sliding groove, a second sliding groove, a base, a second linear guide rail, a second left side vertical plate, a second hole, a spring stop block, a first hole and a scraper mounting plate. A knife grinding unit comprises a first dull polish roller, a first buffer piece, a first spring, a first shaft, a second shaft, a second spring, a second buffer piece, a second dull polish roller, a second roller shaft and a first roller shaft. The device has self-adaptive capacity, comprises a cutter self-adaptive welding position, a scraper unit fool-proof leftover material, a knife grinding unit grinding cutter and automatic gap adjustment, and solves the technical problem of tab wiredrawing in a tab cutting procedure in a lithium battery manufacturing process.

Description

technical field [0001] The invention relates to the field of lithium battery manufacturing, in particular to a tab cutting device and method for soft-pack lithium batteries. Background technique [0002] Power batteries for new energy vehicles are divided into hard-shell batteries and soft-pack batteries. Soft-pack batteries are mainly composed of positive electrodes, negative electrodes, separators, electrolytes, and aluminum-plastic films. The positive electrodes, negative electrodes, and separators are wound into bare cells. The end is designed with tabs, which are divided into positive tabs (Al) and negative tabs (Cu). The tabs need to be welded together with the Tab as the metal contact point for charging and discharging the battery. Before the tab and tab are welded, tab pre-welding and tab cutting processes are required. The purpose of tab pre-welding is to close the tab to avoid false welding (insufficient tension) during final welding. The purpose of tab cutting is ...

AI Technical Summary

Problems solved by technology

[0003] The current problem is that the lug wire drawing problem often occurs in the tab cutting process, and the tab wire drawing is pressed into the seal, resulting in a short circuit or a micro short circuit between the negative electrode (Cu) and the aluminum layer of the aluminum plastic film, and the short circuit cell is directly damaged by the insulation resistance. The tester picks out the cells, which increases the cost of the company; the micro-short-circuit cells have the risk of leakage, and if they flow into the market, there is a risk of causing corrosion and leakage of the cells, reducing the life of the cells, and bringing great benefits to customers, companies and new energy companies. bad influence on business

[0007] 3. The lug cutting cutter is passivated, and the continuous cutting will lead to the lug drawing;

[0008] 4. The gap between the upper cutter and the lower cutter fluctuates, the gap is too large, and the cutting is continuous, resulting in wire drawing of the tabs

[0009] Chinese patent CN 203644864 U discloses a tab automatic welding, cutting and gluing equipment, the upper cutter cylinder drives the upper cutter, the lower cutter cylinder drives the lower cutter, and the upper cutter and the lower cutter move relatively along the linear slide rail. Tab cutting, but there is no tab wire drawing prevention mechanism, there is a risk of tab wire drawing; Chinese patent CN 109759845 A discloses a fully automatic lithium battery tab cutting ultrasonic welding equipment, the cutting cylinder drives the cutter to press down and cut Tab coil material, the tab coil material is cut into tab pieces of a certain size, the cutter chute controls the cutter to only move up and down, but there is no tab wire drawing prevention mechanism, there is a risk of tab wire drawing; Chinese patent CN 209272905 U discloses an automatic cutting and welding device for battery tabs. The tab strip extends between the tab cutter seat and the tab cutter, and the tab cutting cylinder drives the tab cutter to move downward to cut the tab strip into single The lug piece of the tab, but there is no tab wire drawing prevention mechanism, there is a risk of tab wire drawing

Therefore, there is an urgent need for a tab cutting device and method for soft-pack lithium batteries to solve the current tab cutting problem of tab wire drawing, to reduce the manufacturing cost of power batteries, and reduce the risk of battery cell corrosion and leakage. This kind of tab cutting device for soft pack batteries is not available in the market

Images