Lithium ion battery with improved low-temperature charging-discharging performance and preparation method thereof

A lithium ion battery, charging and discharging performance technology, applied in the field of lithium ion battery improving low temperature charging and discharging performance and its preparation field, can solve the problems of battery power exhaustion, reducing battery power capacity, etc., so as to reduce capacity loss and facilitate production. The effect of manufacturing and improving the charge-discharge cycle life

Active Publication Date: 2017-05-17
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that when the battery is in a low temperature state, it is necessary to sacrifice part of the power of the lithium-ion batter

Method used

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  • Lithium ion battery with improved low-temperature charging-discharging performance and preparation method thereof
  • Lithium ion battery with improved low-temperature charging-discharging performance and preparation method thereof
  • Lithium ion battery with improved low-temperature charging-discharging performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A lithium-ion battery with improved low-temperature charge and discharge performance, comprising a bare battery core formed by stacking a positive electrode sheet 1, a separator 3 and a negative electrode sheet 2 sequentially and winding along the same direction, and an electrolyte thereof, and the positive electrode sheet 1 includes a positive electrode The current collector 11 and the positive electrode membrane 12 coated on the positive electrode current collector 11, the negative electrode sheet 2 includes the negative electrode current collector 21 and the negative electrode membrane 22 coated on the negative electrode current collector 21, and one end of the positive electrode current collector 11 is provided with a second A blank area 111, the first blank area 111 is welded with the first conductive terminal 13, one end of the negative electrode current collector 21 is provided with a second blank area 211, and the second blank area 211 is welded with the second co...

Embodiment 2

[0057] A lithium-ion battery with improved low-temperature charge and discharge performance, comprising a bare battery core formed by stacking a positive electrode sheet 1, a separator 3 and a negative electrode sheet 2 sequentially and winding along the same direction, and an electrolyte thereof, and the positive electrode sheet 1 includes a positive electrode The current collector 11 and the positive electrode membrane 12 coated on the positive electrode current collector 11, the negative electrode sheet 2 includes the negative electrode current collector 21 and the negative electrode membrane 22 coated on the negative electrode current collector 21, and one end of the positive electrode current collector 11 is provided with a second A blank area 111, the first blank area 111 is welded with the first conductive terminal 13, one end of the negative electrode current collector 21 is provided with a second blank area 211, and the second blank area 211 is welded with the second co...

Embodiment 3

[0065] Different from Embodiment 1, the other end of the copper foil of the negative current collector 21 is also provided with a third blank area 112 , and the third blank area 112 is also welded with a third conductive terminal 14 . The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery with improved low-temperature charging-discharging performance and a preparation method thereof. The lithium ion battery comprises a naked core which is formed by overlapping a positive plate, an isolating membrane and a negative plate in sequence and winding along the same direction, and electrolyte thereof, wherein the positive plate comprises a positive current collector and a positive diaphragm with which the positive current collector is coated; the negative plate comprises a negative current collector and a negative diaphragm with which the negative current collector is coated; a first blank area is formed at one end of the positive current collector; a first conductive terminal is welded in the first blank area; a second black area is formed at one end of the negative current collector; a second conductive terminal is welded in the second blank area; the other end of the positive current collector and/or the negative current collector is provided with a third blank area; a third conductive terminal is arranged in the third blank area. In the lithium ion battery, the third conductive terminal is arranged on a plate, and is used for heating the battery at a low temperature, so that the battery can be kept at a normal temperature, and the charging-discharging performance of the battery at a low temperature is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery with improved low-temperature charging and discharging performance and a preparation method thereof. Background technique [0002] With the development of new energy technologies, energy storage equipment is required to be able to adapt to a more harsh external environment. Therefore, the applicability of energy storage devices in low temperature environments has received more and more attention. Lithium-ion batteries have high energy density, good rate performance and safety performance, and are environmentally friendly. They are widely used in electronics and new energy vehicles. However, lithium-ion batteries have poor low-temperature performance, especially low-temperature charging performance of lithium-ion batteries. At low temperature (below 0°C), the conductivity of the lithium-ion battery electrolyte is low, and the ohmic ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525H01M10/0587H01M10/44
CPCH01M10/0525H01M10/058H01M10/0587H01M10/44Y02E60/10Y02P70/50
Inventor 陈振王志斌涂健刘喜胡海波
Owner HUNAN LIFANG NEW ENERGY SCI & TECH
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