Today we're going to talk about battery winding process. Choosing the right equipment is sometimes the key to doing a good job, especially when it comes to research and manufacturing lithium ion batteries. We, TOB New Energy, as a global professional lithium battery equipment supplier in particular understand this truth.
This cylindrical cell winding machine is mainly used for 18650, 21700, 26650, 26700, 32650 cells.
TOB-JR135-P pouch cell semi-automatic winder machine is used for winding battery anode and cathode with separator together in the research of Li-ion Pouch cell batteries.
Here are a few key points need to pay attention to when we during the 18650 lithium battery winding process.
1.Humidity control ≤1%RH Purpose: To prevent water absorption in the battery winding process of cathode and anode electrode, resulting in poor zero voltage, self-discharge and bad cycling performance;
Method:calculate the dew point and the temperature got the value.
2. Powder control≤100，000pc/ft3，(detect diameter is 0.5um)
Objective: To prevent dust from being involved in the electrode during winding, resulting in short circuit, overheat, fire and self-discharge of the cell.
Methods: Dust tester was used.
3. Abnormal cutting burr
Process requirement:electrode ≤8um tabs burr≤12um
Adverse effects: Burr of electrode or tabs exceeding process requirements may cause burr to Pierce diaphragm, short circuit of anode and cathode, overheat of electric cell, explosion may occur in serious cases, and serious safety hazard exists.
4. The coverage of cathode and anode
Process requirements: the alignment of cathode and anode is 0.75mm
Alignment of anode with separator 1.5mm
Adverse effects: The alignment of cathode and anode maybe cause anode not wrap the cathode when the cell charge, the Li-ion come out of the cathode will not find the corresponding graphite to be embedded, which causes the free lithium ions in the battery cell to accumulate on the anode and produce dendrites. The dendrites puncture the separator and cause internal short circuit, thus causing potential safety hazards.
The alignment between anode and the separator over the process requirement maybe will cause the anode be squeezed and deformed. Part of the powder on the electrode fall out, during the charge the cell will expand, and the powder will puncture the separator cause cathode and anode inner short circuit and cause the safety hazard.
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