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Thermal safety battery and method for making same

A safety and battery technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve the problems of poor thermal safety of batteries, achieve the effect of preventing large-area instantaneous short circuit, remarkable effect, and simple operation

Active Publication Date: 2007-02-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a battery with high thermal safety and a preparation method thereof in order to overcome the disadvantage of poor thermal safety of batteries in the prior art

Method used

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  • Thermal safety battery and method for making same

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preparation example Construction

[0026] The present invention also provides a method for preparing the above-mentioned thermally safe battery, which includes preparing the positive electrode sheet and the negative electrode sheet of the battery, and fixing one end of the positive electrode sheet, the negative electrode sheet, and the diaphragm layer through adhesive tape to prepare an electrode group, and then the obtained electrode The group and the electrolyte are sealed in the battery case, wherein the width relationship of the positive electrode sheet, the negative electrode sheet and the separator layer satisfies W to ≥3 mm, and W n ≥W p , where W to =W s -W n -W bo , W n Represents the width of the negative plate, W p Represents the width of the positive plate, W s Represents the width of the diaphragm layer, W to Represents the exposed width of one end of the diaphragm layer, W bo Represents the exposed width of the other end of the diaphragm layer, preferably W to = 3-15 mm. Usually, W bo ...

Embodiment 1

[0032] This embodiment is used to illustrate the lithium ion secondary battery provided by the present invention and its preparation method.

[0033] (1) Preparation of positive electrode sheet

[0034] 100 g LiCoO 2 , 5 grams of conductive agent acetylene black and 5 grams of adhesive polyvinylidene fluoride (PVDF) are uniformly mixed in 55 ml of N-methylpyrrolidone (NMP) and then evenly coated on both sides of an aluminum foil with a thickness of 20 microns. After 120 ° C Dried in a vacuum oven, rolled, and cut into pieces to obtain a length of 370 mm and a width of 43.0 mm (W p ), a positive electrode sheet with a thickness of 140 microns. The amount of coating is such that each positive electrode sheet contains 5.8 grams of LiCoO 2 .

[0035] (2) Preparation of negative electrode sheet

[0036] 100 grams of negative electrode active material artificial graphite and 9 grams of binder PVDF are uniformly mixed in 45 milliliters of NMP, and then evenly coated on both side...

Embodiment 2

[0040] This embodiment is used to illustrate the lithium ion secondary battery provided by the present invention and its preparation method.

[0041] (1) Preparation of positive electrode

[0042] 100 g LiCoO 2 , 5 grams of conductive agent acetylene black and 5 grams of adhesive polyvinylidene fluoride (PVDF) are uniformly mixed in 55 ml of N-methylpyrrolidone (NMP) and then evenly coated on both sides of an aluminum foil with a thickness of 20 microns. After 120 ° C Dried in a vacuum oven, rolled, and cut into pieces to obtain a length of 370 mm and a width of 42.0 mm (W p ), a positive electrode with a thickness of 140 microns. Coated in such an amount that the resulting positive electrode contained 5.8 grams of LiCoO 2 .

[0043] (2) Preparation of negative electrode

[0044] 100 grams of negative electrode active material artificial graphite and 9 grams of binder PVDF are uniformly mixed in 40 milliliters of NMP, and then evenly coated on both sides on a copper foil ...

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Abstract

The invention relates to a thermal safety battery, which comprises electrode group and electrolyte, both sealed in the battery frame. Wherein, the electrode group comprises anode plate, cathode plate and the separating layer, while their widths meet Wto>=3mm, Wn>=Wp, and Wto=Ws-Wn-Wbo, Wn is the width of cathode plate, Wp is the width of anode plate, Ws is the width of separating layer, Wto is the exposed width at one end of separating layer, and Wbo is the exposed width at another end of separating layer.

Description

technical field [0001] The invention relates to a heat-safe battery and a preparation method thereof. Background technique [0002] Generally speaking, a battery is composed of an electrode group and an electrolyte contained in a battery case. The electrode group is composed of a positive electrode sheet, a negative electrode sheet, and a separator layer separating the positive electrode sheet and the negative electrode sheet. The separator layer is usually made of Modified polyethylene felt, polypropylene felt, vinylon felt or nylon felt and wettable polyolefin microporous membrane are welded or bonded composite membrane. At the same time, in order to ensure that the wound electrode group can be smoothly placed into the metal battery case, adhesive tape is usually pasted on the bottom of the electrode group to fix the separator layer. With the continuous development of batteries, the energy density of batteries has also been improved unprecedentedly. On the other hand, du...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M4/02H01M10/38H01M10/40H01M4/13H01M10/0525H01M10/058H01M50/463
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 肖峰孙华军
Owner BYD CO LTD
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