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Thermal composite laminated soft package lithium ion battery and preparation method thereof

A lithium-ion battery, laminated technology, applied in secondary batteries, secondary battery repair/maintenance, secondary battery charging/discharging, etc. The problem of uneven heating of the sheet can be solved, and the effect of uniform electrochemical performance, consistent adhesion of the separator, and consistent electrochemical performance can be achieved

Inactive Publication Date: 2021-02-12
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of uneven heating of the pole pieces and uneven adhesion of the diaphragm during the hot pressing process of the traditional laminated lithium-ion battery, which leads to poor cycle performance of the battery cell and potential safety hazards, the invention provides a battery with good heating uniformity. , Good cell cycle performance, good safety performance thermal composite laminated soft pack lithium-ion battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) During the stacking process, set up 3 rolls of separator, one roll of positive electrode sheet, one roll of negative electrode sheet, and one roll of heat conduction member (copper foil); after cutting the positive electrode sheet to the set size of the positive electrode sheet, place it on the first Roll the diaphragm, overheat the roller together with the diaphragm, bond and fix it on the diaphragm, and then cut the diaphragm to form the positive electrode unit;

[0028] (2) After cutting the negative electrode roll to the size of the negative electrode sheet, place it on the second roll of separator, overheat the roll with the separator, bond and fix it on the separator, and then cut the separator to form the negative electrode unit;

[0029] (3) After cutting the pole roll (copper foil) of the heat conduction element to the set size, place it on the third roll of diaphragm, overheat and press the roll together with the diaphragm, bond and fix it on the diaphragm,...

Embodiment 2

[0033] (1) During the stacking process, set up 3 rolls of diaphragm, one roll of positive electrode sheet, one roll of negative electrode sheet, and one roll of heat conduction member (aluminum foil); after cutting the positive electrode sheet to the set size of the positive electrode sheet, place it on the first roll On the diaphragm, overheat the roller together with the diaphragm, bond and fix it on the diaphragm, and then cut the diaphragm to form a positive electrode unit;

[0034] (2) After cutting the negative electrode roll to the size of the negative electrode sheet, place it on the second roll of separator, overheat the roll with the separator, bond and fix it on the separator, and then cut the separator to form the negative electrode unit;

[0035] (3) After cutting the pole roll (aluminum foil) of the heat-conducting element to the set size, place it on the third roll of diaphragm, overheat the roll with the diaphragm, bond and fix it on the diaphragm, and then cut ...

Embodiment 3

[0039](1) During the stacking process, set up 3 rolls of separator, one roll of positive electrode sheet, one roll of negative electrode sheet, and one roll of heat conduction member (nickel foil); after cutting the positive electrode sheet to the set size of the positive electrode sheet, place it in the first Roll the diaphragm, overheat the roller together with the diaphragm, bond and fix it on the diaphragm, and then cut the diaphragm to form the positive electrode unit;

[0040] (2) After cutting the negative electrode roll to the size of the negative electrode sheet, place it on the second roll of separator, overheat the roll with the separator, bond and fix it on the separator, and then cut the separator to form the negative electrode unit;

[0041] (3) After cutting the pole roll (nickel foil) of the heat conduction element to the set size, place it on the third roll of diaphragm, overheat and press the roll together with the diaphragm, bond and fix it on the diaphragm, ...

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PUM

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Abstract

The invention relates to the technical field of lithium ion batteries, and provides a thermal composite laminated soft package lithium ion battery and a preparation method thereof in order to solve the problems of poor battery cell cycle performance and potential safety hazards caused by non-uniform pole piece heating and non-uniform diaphragm adhesive force in the hot pressing process of a traditional laminated lithium ion battery. The thermal composite laminated soft package lithium ion battery comprises a roll core, an electrolyte, a positive tab, a negative tab and an aluminum-plastic filmbag, the roll core comprises a plurality of positive units and negative units which are stacked in a crossed manner, and a heat conduction piece unit adhered to the outermost layer, and the heat conduction piece unit is insulated from the positive units and the negative units. The heat conduction piece unit is arranged in the battery, so that the uniformity of the thermal compounding bonding force can be obviously improved, the electrochemical performance of each part of the battery is uniform, and potential safety hazards such as black spots and lithium precipitation are avoided. And in thecharge-discharge cycle of the battery, the temperature difference caused by different heat dissipation capacities of all parts of the battery cell can be reduced, and the cycle performance and the safety performance of the battery cell are improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a heat-composite laminated soft-pack lithium-ion battery and a preparation method thereof. Background technique [0002] A lithium-ion battery is a secondary battery (rechargeable battery) that works primarily by moving lithium ions between the positive and negative electrodes. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] According to the different assembly methods of pole pieces, the preparation process of lithium-ion batteries usually has two process routes: winding and stacking. The winding process is to fix the positive and negative electrode sheets, se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M10/0525H01M10/44
CPCH01M10/0585H01M10/0525H01M10/446Y02E60/10Y02P70/50
Inventor 刘涛张志剑宋明饶绍建
Owner WANXIANG 123 CO LTD