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

Pending Publication Date: 2022-03-18
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the stress of the winding core itself prepared by the above method, it may expand to a certain extent after being placed for a period of time, making it impossible to fit into the battery case. Therefore, a method to inhibit the expansion of the winding battery is to very necessary

Method used

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  • Method for solving expansion of winding type battery cell
  • Method for solving expansion of winding type battery cell

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

According to the method for solving expansion of the wound battery cell and the application of the method, a layer of polymer is deposited on the surface of the wound battery cell through a vacuum gas phase deposition method to form the wound cell fixing layer, the effect of limiting expansion of the wound cell is achieved, and the efficiency of the shell entering procedure of the wound battery is improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a method for solving the expansion of wound electric cores. Background technique [0002] The winding battery is highly respected because of its easy mechanization, faster speed, more guaranteed uniformity, and is conducive to mass production. The manufacturing method of the winding type core is to align and stack the negative electrode-diaphragm-positive electrode in order, wind it on the winding needle, and then stick the edge with adhesive tape to obtain the core. The adhesive tape can only be used for pasting The place acts as a limit and cannot guarantee a controlled expansion of the core body. [0003] CN110474104A discloses a wound electric core and a battery using the wound electric core. The wound electric core includes a wound first pole piece, a second pole piece and a first separator between the two pole pieces , both the first pole piece and the second pole piece h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/04
CPCH01M10/0587H01M10/0431Y02E60/10Y02P70/50
Inventor 彭燕秋袁中直刘金成刘建华
Owner EVE ENERGY CO LTD
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