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
View PDF2 Cites 5 Cited by
  • 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 preparati

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Thermal safety battery and method for making same

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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 ...

Example Embodiment

[0031] Example 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...

Example Embodiment

[0039] Example 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 sid...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap