Winding-type lithium battery and battery cell thereof

A lithium battery, wound-type technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of greatly affecting the electrical performance of the battery and increasing the internal resistance of the battery

Active Publication Date: 2013-08-21
HANGZHOU FUTURE POWER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-temperature resistant diaphragm does not shrink sharply in the range of 140-300 ° C, and the positive and negative electrodes will not have large-area short circuits, which avoids battery fire and explosion, but this solution has a great impact on the electrical performance of the battery
For example, the lithium battery in the Chinese patent with publication number CN1438719A is made of PP / PE / PP diaphragm and porous polyimide diaphragm, wherein the porous polyimide diaphragm has a porosity of 50% to 70% and a pore size of 5 to 15 mm. Micron, the thickness is 25-35 microns. Although the patented lithium battery has high high temperature safety, the design of the double-layer separator will greatly increase the internal resistance of the battery.

Method used

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  • Winding-type lithium battery and battery cell thereof
  • Winding-type lithium battery and battery cell thereof
  • Winding-type lithium battery and battery cell thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of the positive electrode sheet: the positive electrode active material lithium cobaltate, conductive carbon, and polyvinylidene fluoride are mixed and dissolved in the nitrogen methyl pyrrolidone solution in a mass ratio of 98:1:1 to form a slurry, and the slurry is Coated on the aluminum current collector, rolled to 135±3μm after drying and welded tabs to form positive pole pieces;

[0028] Preparation of negative electrode sheet: Dissolve negative electrode active material, conductive carbon and carboxymethyl cellulose sodium in water, then mix with styrene-butadiene rubber binder to form a slurry, and coat it on copper current collector. The negative electrode active material The mass ratio of conductive carbon, carboxymethyl cellulose and styrene-butadiene rubber is 97:1:1:1. After drying, it is rolled to 145±3μm and welded to form a negative electrode sheet.

[0029] The positive electrode sheet, negative electrode sheet and separator are placed at int...

Embodiment 2

[0033] Preparation of the positive electrode sheet: the positive active material lithium cobaltate, conductive carbon, and polyvinylidene fluoride are mixed and dissolved in the nitrogen methyl pyrrolidone solution according to the mass ratio of 98:1:1 to form a slurry, and the slurry is Coated on the aluminum current collector, rolled to 135±3μm after drying and welded tabs to form positive pole pieces;

[0034] Preparation of negative electrode sheet: Dissolve negative electrode active material, conductive carbon and carboxymethyl cellulose sodium in water, then mix with styrene-butadiene rubber binder to form a slurry, and coat it on copper current collector. The negative electrode active material The mass ratio of conductive carbon, carboxymethyl cellulose and styrene-butadiene rubber is 97:1:1:1. After drying, it is rolled to 145±3μm and welded to form a negative electrode sheet.

[0035] The positive electrode sheet, negative electrode sheet and separator are placed at i...

Embodiment 3

[0039] Preparation of the positive electrode sheet: the positive active material lithium cobaltate, conductive carbon, and polyvinylidene fluoride are mixed and dissolved in the nitrogen methyl pyrrolidone solution according to the mass ratio of 98:1:1 to form a slurry, and the slurry is Coated on the aluminum current collector, rolled to 135±3μm after drying and welded tabs to form positive pole pieces;

[0040] Preparation of negative electrode sheet: Dissolve negative electrode active material, conductive carbon and carboxymethyl cellulose sodium in water, then mix with styrene-butadiene rubber binder to form a slurry, and coat it on copper current collector. The negative electrode active material The mass ratio of conductive carbon, carboxymethyl cellulose and styrene-butadiene rubber is 97:1:1:1. After drying, it is rolled to 145±3μm and welded to form a negative electrode sheet.

[0041] The positive electrode sheet, negative electrode sheet and separator are placed at i...

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Abstract

The invention provides a lithium battery with high-temperature safety and a battery cell of the lithium battery. According to the invention, a first diaphragm is arranged between the positive electrode and the negative electrode of an inner layer of the battery cell of the winding-type lithium battery; a second diaphragm is arranged between the positive electrode and the negative electrode at the outermost circle of the battery cell; the hot melting temperature of the first diaphragm is above 260 DEG C; and the hot melting temperature of the second diaphragm is 130-180 DEG C. Because an overlapped arrangement method is not adopted for the first diaphragm and the second diaphragm, the diaphragm with low hot melting temperature is arranged at the outermost circle of the battery cell, and the overlapped area of the two diaphragms is small, influence to the inner resistance and the energy density of the lithium battery is tiny.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a winding lithium battery and its battery core. Background technique [0002] Lithium-ion batteries have been widely used in various electronic products due to their advantages such as high energy density, high output voltage, long cycle life, and low environmental pollution. The structure of lithium-ion batteries mainly includes laminated type and wound type. At present, the battery core of the wound lithium battery includes a positive electrode sheet, a separator, and a negative electrode sheet that are stacked and wound in sequence. The winding end of the positive electrode sheet is integrally formed with a positive electrode ear, and the winding end of the negative electrode is integrally formed with a negative electrode ear. [0003] In recent years, incidents of lithium-ion battery explosions and injuries have become common, most of which are caused by battery th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/0525H01M2/14
CPCY02E60/10Y02P70/50
Inventor 周生强陶裕锋孙征峰曹俊琪龚本利郑长明吕晶
Owner HANGZHOU FUTURE POWER TECH
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