Lithium Battery 3.7V Lithium Polymer Battery 3.2V LifePo4 Battery 1.2V Ni-MH Battery Button Coin Battery
3.7V Battery Pack 7.4V Battery Pack 11.1V Battery Pack 14.8V Battery Pack Other Battery Pack
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
Guizhou STD Battery 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.
release time:2023-10-13 Hits: Popular:AG11 battery
What should we pay attention to in the winding process of 18650 lithium battery?
1. Humidity control <1% RH Purpose: Beware of water absorption during the winding process of the positive and negative electrode sheets, 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;
2. Dust control ≤100,000pc/ft3 (test particle size is 0.5um)
Purpose: To prevent dust from being involved in the electrode assembly during winding, causing battery core short circuit, overheating, fire, self-discharge and other defects;
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%
Click for details
Method: Use dust detector;
3. Abnormal cutting burrs
Process requirements: pole piece ≤8um; pole lug burr ≤12um; test method: randomly select 1 PCS battery cells for dissection during the first inspection of each machine in each shift, and test the front and rear ends of the positive and negative pole pieces and the positive electrode according to the "Burr Test Operation Instruction Book" , Negative tab cutting burrs.
Adverse effects: The burrs on the pole pieces or tabs exceeding the process requirements may cause the burrs to pierce the diaphragm, short-circuit the positive and negative poles, cause the battery core to overheat, and may explode in severe cases, posing serious safety hazards.
18650 lithium ion battery winding steps
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%
Click for details
4. Difference in overturning of positive and negative electrode plates
Process requirements: The alignment of positive and negative electrode plates is 0.75?.55mm
The alignment between the negative electrode sheet and the separator is 1?.5mm
Testing method: After changing the roll, random inspection continues with 3PCS cells. Test the alignment according to the "X-RAY Operation Instruction Manual". Adverse effects: 1) The alignment of the positive and negative electrodes exceeds the process specifications, which may cause the negative electrodes not to wrap the positive electrodes, and the positive electrodes are not wrapped around the battery core. During the charging process, the lithium ions released from the positive electrode cannot find the corresponding graphite to embed, causing free lithium ions in the battery core to accumulate on the negative electrode and form dendrites. The dendrites pierce the separator, causing an internal short circuit and posing a safety hazard.
2) If the alignment between the negative electrode sheet and the separator exceeds the process standard, the negative electrode sheet may be squeezed and deformed, and the negative electrode material on the electrode sheet may partially fall off. During the charging process, the battery core will expand, and the powder will pierce the separator, causing an internal short circuit of the positive and negative electrodes, causing safety hazards. hidden danger;
5. The pole piece overturning difference in the winding direction (the length of the outer layer of negative electrode and super positive electrode material, the length of the inner layer of negative electrode and super positive electrode material) test method: every 2 hours, each winding machine randomly inspects the dissection of 3 PCS cells, and uses an eyepiece and a ruler to measure the two Kind of overturning difference size.
Adverse effects: It may cause the negative electrode sheet not to wrap the positive electrode sheet. During the charging process of the battery cell, the lithium ions released from the positive electrode cannot find the corresponding graphite to embed, causing free lithium ions in the battery core to accumulate on the negative electrode and form dendrites. Dendrites pierce the diaphragm and cause an internal short circuit, posing a safety hazard.
18650 lithium ion battery winding steps
6. Short circuit detection
Parameter settings (100V, 25nF250V,
250uA) Test method: use short-circuit sample detection machine during the first inspection of each shift; adverse effects: short-circuit factors such as self-discharge, heating, explosion, etc.: cutting particles, metal dust, burrs, etc. causing diaphragm holes;
Read recommendations:
Good Low-temperature Performance of Lithium-ion Batteries
Last article:18650 battery 3.7v 2200mah.Research on thermal runaway of 18650 lithium battery under 80 conditions
Next article:batteries aaa.US scientists develop new button photovoltaic cells
Popular recommendation
521133 lipo battery company
2023-03-2218650 battery rechargeable
2023-03-22convenient energy storage power supply Manufacturing
2023-05-10Nickel Hydride Batteries
2023-03-22703048 battery
2023-03-2214500 850mAh 3.7V
2022-08-19801620 180mAh 3.7V
2022-08-19701221 120mAh 3.7V
2022-08-1918650 1500mAh 3.7V
2022-06-206F22
2022-08-19Rack-mounted energy storage battery GN-192V 100Ah
2022-09-27R20
2022-12-01Coin Battery CR 2025
2022-09-27Coin Battery LR 927
2022-10-15Lithium-ion battery GN-300
2022-09-2718650 3500mah battery
2023-06-252000mah 18650 battery
2023-06-25AA Carbon battery
2023-06-25602535 lipo battery
2023-06-25CR1220 battery
2023-06-25Charging precautions for forklifts.6LR61 battery
2024-05-29Characteristics of lithium battery separator
2022-11-23Advantages Analysis of Polymer Lithium Batteries
2024-11-05Working Principle of Liquid Lithium - Ion Batteries
2025-05-17How to ensure the consistency of the 18650 battery pack?button cell battery cr1620
2023-09-18Precautions for nickel -hydride battery maintenance.702535 polymer battery
2023-05-18-50 low-temperature rechargeable lithium battery 2.4V-1300mah
2023-09-13Lithium iron phosphate (LiFePO4) lithium battery.energy storage battery for solar system Factory
2023-04-18How to distinguish between energy storage lithium batteries and power lithium batteries.R03 Carbon b
2023-10-10Lithium battery recovery.18650 battery 1800 mah
2023-06-09