バッテリーセパレータ、バッテリーセパレータのための準備方法、バッテリー、および端末

Japanese Patent JP7403680

B2

Embodiments of this application provide a battery separator, including a poly olefin-based porous separator, where the polyolefin-based porous separator includes polyethylene resin, an elongation rate of the polyolefin-based porous separator in an MD direction is greater than 120%, an elongation rate in a TD direction is greater than 120%, and for the polyolefin-based porous separator, crystallinity at a first-time temperature rise of polyethylene that is measured by using a differential scanning calorimeter is less than 65%, crystallinity at a second-time temperature rise is less than 55%, and a difference between the crystallinity at the first-time temperature rise and the crystallinity at the second-time temperature rise is less than 12%. The battery separator features a high elongation rate and a low temperature of closing a pore. When a battery cell is mechanically abused, a risk of separator breakage can be reduced by implementing embodiments of this application. In addition, a separator pore can be closed in advance when the battery cell is in thermal abuse, to improve safety of the battery cell. Embodiments of this application further provide a preparation method for a battery separator, and a battery and a terminal that use the battery separator.

WO/2018/164054	POLYOLEFIN MICROPOROUS MEMBRANE
WO/2013/146402	BATTERY SEPARATOR AND METHOD FOR PRODUCING SAME
JP6404401	High Melting Point Microporous Lithium Ion Rechargeable Battery Separator and Manufacturing Method and Usage

▲張▼ 新枝
▲ドン▼ 耀明
high clouds
▲陽▼ ▲東▼方
Seo Fan
▲謝▼ 封超
Lee Jeong-jie

JP2022552702A

December 22, 2023

March 04, 2021

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HUAWEI TECHNOLOGIES CO.,LTD.

H01M50/417; H01M50/247; H01M50/403; H01M50/449; H01M50/489

JP2005343957A
JP2019143142A

WO2014126079A1

Katsugo Akazawa
Ikudai Kubota

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