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Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .
Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales
Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
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release time:2023-10-13 Hits: Popular:AG11 battery
Issues to note during the winding process of 18650 lithium battery Issues to note during the winding process of 18650 lithium battery 1. Objective: To prevent water absorption during the winding process of the positive and negative electrodes, resulting in zero voltage, self-discharge, and poor cycle performance; Method: Calculate the dew point value and Temperature value, the temperature and humidity value is obtained. 2. Dust control
Issues to note during the winding process of 18650 lithium-ion battery
Issues to note during the winding process of 18650 lithium-ion battery
1. Objective: To prevent the positive and negative electrodes from absorbing water during the winding process, resulting in zero voltage, self-discharge, and poor cycle performance;
Method: Calculate the dew point value and temperature value to obtain the temperature and humidity value.
Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%
Charging temperature: -20~45℃ -Discharge temperature: -40~+55℃ -40℃ Support maximum discharge rate: 3C -40℃ 3C discharge capacity retention rate ≥70%
2. Dust control≤100,000PC/ft3 (particle size 0.5um)
Purpose: To prevent dust in the pole group during the winding process, causing short circuit, overheating, fire, self-discharge and other phenomena.
Method: Use dust measuring instrument.
3. Abnormal burr reduction
Process requirements: pole piece ≤8um; pole lug burrs≤12um; Test method: 1 Computer electric cell randomly selects the first one to inspect each machine at each transition, and cuts the burrs on the front and rear ends of the positive and negative electrodes and the positive side of the ear The negative electrode operates according to the burr detection instructions.
Low temperature and high energy density 18650 3350mAh-40℃ 0.5C discharge capacity ≥60%
Charging temperature: 0~45℃ Discharge temperature: -40~+55℃ Specific energy: 240Wh/kg -40℃ Discharge capacity retention rate: 0.5C Discharge capacity ≥ 60%
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Adverse reactions: The burrs on the electrode plates or tabs exceed the technical requirements, which may cause perforation of the separator, short circuit of the positive and negative electrodes, overheating of the battery, explosion in severe cases, and serious safety hazards.
18650 lithium ion battery winding steps
4. The anode and cathode plate covers are not good
Process requirements: The centering of the positive and negative plates is 0.75 to 55 mm.
The negative plate and separator are aligned to 1?5 mm
Testing method: After changing the volume sampling, observe the degree of adverse reactions of 3 consecutive PCS batteries after calibration by There is no corresponding graphite embedded on the front side of the ion, and free accumulation on the cathode dendrites of the lithium-ion battery. The dendrites pierce the separator, causing an internal short circuit, which poses a safety hazard.
2) The alignment between the negative plate and the separator exceeds the technical standard, which may cause the negative plate to be extruded and deformed. Part of the negative electrode material on the electrode plate fell off, and the battery expanded during charging.
5. Covering test method differences (length of outer negative super positive material and inner negative super positive material) of winding pole piece direction: every 2h, each winding machine is sampled for inspection of the core anatomy of 3 PCs, and measured separately Two coverage of different dimensions with eyepieces and rulers.
Adverse reactions: The negative plate cannot cover the positive plate. During the battery charging process, after the lithium ions leave the positive electrode, they cannot find the corresponding graphite embedding, causing the free lithium ions in the battery to accumulate on the negative electrode and dendrites appear. The dendrites puncture the membrane, causing an internal short circuit and endangering safety.
18650 lithium ion battery winding steps
6. Short circuit test
Parameter settings (100V, 25nF250V,
Test method: The short-circuit sample testing machine should be used for initial inspection of each shift; adverse effects: self-discharge, heating, explosion and other short-circuit factors: cutting particles, metal dust, burrs, etc., causing the diaphragm hole to rupture;
7. Glue foil and tab tension
Process requirements: tensile strength≥15N bonding foil area>2/3 welding printing
Test method: Sample 1 PCS battery every 2 hours for tensile test and foil test
Adverse reactions: high internal resistance
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