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Method of preventing short circuiting in a lithium ion battery

A lithium-ion battery, charging process technology, applied in circuits, battery electrodes, secondary batteries, etc., can solve problems such as short circuits

Inactive Publication Date: 2005-09-07
CELGARD LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At point 18, the anode 12 and cathode 16 will touch causing a short circuit

Method used

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  • Method of preventing short circuiting in a lithium ion battery
  • Method of preventing short circuiting in a lithium ion battery
  • Method of preventing short circuiting in a lithium ion battery

Examples

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Embodiment Construction

[0012] Referring to the drawings, wherein like numerals indicate like elements, FIG. 1 shows a prior art battery 10 .

[0013] The battery 10 is a conventional lithium-ion battery, cylindrical or prismatic. The anode is a lithiated intercalation compound (mostly carbon-based (e.g., coke and / or graphite), but can also be a metal oxide (e.g., WO 2 , MoO 2 , TiS 2 )). Preferably, the anode is a lithiated coke or graphite compound. The separator is a microporous polyolefin membrane preferably having a thickness of less than or equal to about 1 mil (25 microns). The separator can be a monolayer film made of polyolefins, including polyethylene (LDPE, LLDPE, HDPE, UHMWPE, and combinations thereof), or a polyolefin, including polyethylene (low density polyethylene (LDPE), Linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), ultra-high molecular weight polyethylene (UHMWPE) and their combinations), polypropylene, polybutene, polymethylpentene and their copoly...

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Abstract

The invention is a method for preventing short circuiting in a lithium ion battery. The battery has an anode made of intercalation compound, a cathode made of an intercalation compound, and a separator having a thickness of 25 microns or less sandwiched between the anode and the cathode. The method includes the steps of rounding or beveling the edge portion of the cathode, so that during charging when the anode and cathode expand and squeeze the separator, the rounded or beveled edge portion of the cathode cannot cut the separator.

Description

technical field [0001] The present invention relates to the prevention of short circuits in lithium ion batteries by rounding or beveling the cathode of the lithium ion battery. Background technique [0002] Short circuits are a well-known problem in lithium-ion batteries. A short circuit occurs when the anode and cathode make physical contact. A separator placed between the anode and cathode prevents contact between the two. However, the partition may be damaged. This can occur due to damage to the battery (eg, crushing or puncturing), damage during manufacturing (eg, puncturing of the separator), dendrite growth, or damage during charging. Preventing damage to the separator during charging is the focus of the present invention. [0003] During charging, the anode, i.e. the intercalation compound (mostly carbon-based (e.g., coke and / or graphite), but also metal oxides (e.g., WO 2 , MoO 2 , TiS 2 )), receiving from the cathode that intercalation compound (mostly metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/50H01M4/505H01M4/52H01M4/525H01M10/0525H01M10/36H01M10/42H01M50/586
CPCH01M10/4235H01M2/34Y02E60/122H01M4/505H01M10/0525H01M4/525H01M4/131Y10T29/49108H01M50/586E01D2/02E01D2101/28
Inventor 张正铭
Owner CELGARD LLC
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