18650 Lithium Battery Wound Step Process What should I pay attention to?

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

1, humidity control≤1% RH purpose: Alert water in the positive and negative pole winding process, resulting in zero voltage, self-discharge, cycle performance; method: calculate the dew point value and temperature value of temperature and humidity value; 2. Dust control≤The purpose of 100,000pc / ft3 (the test particle size is 0.5um) Objective: Amissive dust is involved in the pole group in the wound, causing the battery to short circuit, overheating, fire, self-discharge, etc.

; method: use dust detector; 3, cut Burrow abnormal process requirements: pole piece≤8UM; extreme ear≤12UM; Test method: Each shift is randomly extracted with 1PCS battery, according to the "glitch test operation command" test positive, negative pole front and rear end and positive, negative ear cutting. Adverse effect: polar or extreme ear hairy beyond process requirements may result in burr piercing diaphragms, make positive and negative short circuits, overheating of the battery, can explode seriously, there is a serious safety hazard. 18650 lithium-ion battery winding step 4, positive and negative pole tilt length process requirements: positive, negative electrode pair 齐 齐 0.

75 ?55mm negative electrode sheet and diaphragm ration 1 ?5mm test mode: change the volume after the test continued 3PCS battery "X-Ray Job Commondell" test has a negative impact on the degree of unity: 1) The positive and negative electrode parallelity beyond the process specification may cause the negative electrode film to be unblocked, during the battery charging process, the lithium ion that is not finding it is unable to find The corresponding graphite is embedded, resulting in a free lithium ion in the battery to accumulate dendrites on the negative electrode, and the dendritic crystal puncture diaphragm causes internal short circuits. 2) The negative electrode sheet and the diaphragm return to the process standard may cause the negative electrode sheet to be extruded, and the negative electrical portion on the polar sheet is detached. The core expansion during the charging process, the powder piercing diaphragm causes the positive and negative electrode short-circuit and safety Hidden dangers; 5, the wound direction is tipped (outer negative electrode is super positive electrode length, the inner negative electrode super positive electrode length) Test method: each winding machine is sampled 3PCS cell anatomy, with a mirror and a straightforward Measurement of two types of tip coupons.

Adverse effect: may cause the negative electrode to unblocate the positive electrode sheet, during the battery charging process, the lithium ions that are detached from the positive electrode cannot find the corresponding graphite embedding, resulting in a free lithium ion in the battery to accumulate dendrites on the negative electrode, The dendritic piercing diaphragm causes internal short circuit and there is a safety hazard. 18650 lithium-ion battery winding step 6, short circuit detection parameter setting (100V, 25NF250V, 250UA) test mode: short-circuit sample detection machine with short-circuit samples in each class; adverse effect: self-discharge, fever, explosion and other short circuit factors: cut Particles, metallic dust, burrs, etc.

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