Method for solving expansion of winding type battery cell
A battery expansion and winding technology, which is applied in the direction of winding/folding electrodes, circuits, electrical components, etc., can solve the problems of expansion and failure to fit into the battery case, and achieve the effect of excellent mechanical strength
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Embodiment 1
[0035] This embodiment provides a low-expansion wound-type electric core, and the preparation method of the low-expansion wound electric core is as follows:
[0036] (1) Stack the silicon-based negative electrode sheet, PE separator, and NCM positive electrode sheet in sequence. According to the design requirements of the battery, select a suitable winding needle for winding, and fix the obtained winding core with a small piece of PP-based adhesive tape to obtain a roll winding battery;
[0037] (2) Put the above winding cell into a vacuum vapor deposition coating machine, set the evaporation temperature to 150°C, the pyrolysis temperature to 500°C, and the vacuum pressure to 2 millitorr, and use parylene in the winding cell A polymer layer with a thickness of 3 μm was evenly plated on the surface of the polymer to obtain the low expansion rate winding battery core.
Embodiment 2
[0039] This embodiment provides a low-expansion wound-type electric core, and the preparation method of the low-expansion wound electric core is as follows:
[0040] (1) Stack the graphite negative electrode sheet, PE diaphragm and lithium iron phosphate positive electrode sheet in sequence, select a suitable winding needle for winding according to the design requirements of the battery, and fix the obtained winding core with a small piece of PE tape to obtain a roll winding battery;
[0041] (2) Put the above core into a vacuum vapor deposition coating machine, set the evaporation temperature to 170°C, the pyrolysis temperature to 600°C, and the vacuum pressure to 3 millitorr, and use parylene to evenly coat a layer with a thickness of 3 μm. polymer layer to obtain the low-expansion wound-type battery core.
Embodiment 3
[0043] This embodiment provides a low-expansion wound-type electric core, and the preparation method of the low-expansion wound electric core is as follows:
[0044] (1) Stack the silicon-based negative electrode sheet, PE separator, and NCM positive electrode sheet in sequence. According to the design requirements of the battery, select a suitable winding needle for winding, and fix the obtained winding core with a small piece of PP tape to obtain a winding battery cell;
[0045] (2) Put the above core into a vacuum vapor deposition coating machine, set the evaporation temperature to 150°C, the pyrolysis temperature to 500°C, and the vacuum pressure to 2 millitorr, and use parylene to evenly coat a layer with a thickness of 0.5 μm polymer layer to obtain the low expansion rate winding cell.
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