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Laminated battery preparation method capable of improving needling safety performance

A safety performance, lamination technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of uncontrollable cycle or rate performance, battery capacity reduction, cost increase, etc., to achieve significant production practical significance, reduce The effect of generating heat and improving the safety performance of acupuncture

Inactive Publication Date: 2019-06-07
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, changing the way of internal materials will lead to uncontrollable cycle or rate performance change, and changing the way of external structure will lead to a decrease in battery capacity and an increase in cost

Method used

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  • Laminated battery preparation method capable of improving needling safety performance
  • Laminated battery preparation method capable of improving needling safety performance
  • Laminated battery preparation method capable of improving needling safety performance

Examples

Experimental program
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Effect test

preparation example Construction

[0027] see figure 1 , the invention provides a method for preparing a laminated battery capable of improving acupuncture safety performance, the method comprising the following steps:

[0028] The first step: Before preparing the preset laminated battery, measure the maximum current withstand value of the tab on the positive electrode sheet to be used for the preset laminated battery. The preset laminated battery for the pre-equipment is: the user wants to obtain , a laminated battery with a preset battery capacity and a preset maximum required discharge current; the maximum current withstand value of the tab on the positive plate to be used in the preset laminated battery is the power-on of the tab on the positive plate when a power failure occurs Current size;

[0029] In terms of specific implementation, the preset laminated battery can be any kind of laminated battery that the user wants to obtain, has a preset battery capacity and a preset maximum required discharge curr...

Embodiment 1

[0054] In Example 1, using a method for preparing a stacked battery that can improve the safety performance of needle punching provided by the present invention, the model 4360143 battery of the ternary material NCM622 stack is processed, and the detailed steps are as follows:

[0055] In the first step, since the positive electrode of the battery uses a current collector of 15 μm aluminum foil with a grade of 8021, two aluminum lugs with a width of 2mm are made out of the coated positive electrode, and the single electrode is made into a 4360143 similar battery. With the same weight of electrolyte, two positive tabs are drawn on the single pole piece battery. Use the charging and discharging equipment to charge the simulated battery with a gradient of 0.5A and increase the current. The initial current is 1A. When the current is 10.5A, the battery will be powered off and cannot continue to charge. Repeat three times, and the current is all within 10.5±0.5A, so it is determined...

Embodiment 2

[0061] In Example 2, using a method for preparing a stacked battery that can improve the safety performance of acupuncture provided by the present invention, the model of the ternary material NCM811 stacked battery is 4360143, and the detailed steps are as follows:

[0062] In the first step, since the positive electrode of the battery uses a current collector of 15 μm aluminum foil with a grade of 8021, two aluminum lugs with a width of 2mm are made out of the coated positive electrode, and the single electrode is made into a 4360143 similar battery. With the same weight of electrolyte, two positive tabs are drawn out on the single pole piece battery. Use the charging and discharging equipment to charge the simulated battery with a gradient of 0.5A and increase the current. The initial current is 1A. When the current is 10.5A, the battery will be powered off and cannot continue to charge. Repeat three times, and the current is all within 10.5±0.5A, so it is determined that th...

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Abstract

The invention discloses a laminated battery preparation method capable of improving needling safety performance. The method comprises steps: 1, before preparation of a preset laminated battery, the maximum current withstanding value of a lead on a positive electrode sheet which is about to be adopted by the preset laminated battery is measured; 2, according to the preset battery capacity of the preset laminated battery and the preset maximum demand discharge current, the maximum demand discharge current of each positive electrode sheet on the preset laminated battery is correspondingly calculated and acquired, and besides, according to the maximum current withstanding value of the lead on the positive electrode sheet, the minimum cross-sectional area of the lead on each positive electrodesheet is calculated and acquired; 3, a positive electrode sheet lead with the minimum cross-sectional area is processed and acquired; 5, a battery electrode group is prepared and acquired; and 5, thepreset laminated battery is prepared and acquired. During the process with needling short circuit to enable large current to pass through for the battery, the lead is fused, passing of the current isfurther blocked, the heat generation amount inside the battery in the case of needling short circuit can be reduced significantly, and the battery needling safety performance is effectively enhanced.

Description

technical field [0001] The invention relates to the technical field of battery safety, in particular to a preparation method of a laminated battery capable of improving acupuncture safety performance. Background technique [0002] In recent years, with the continuous development of wireless power devices, people's demand for lithium-ion battery capacity has continued to increase. However, with the increase in capacity, the safety performance of batteries has attracted more and more attention. Among the many battery safety tests, the acupuncture safety test is the most difficult test item to pass. [0003] In order to meet the needling performance, current batteries often use internal material changes or external structure changes to improve their safety performance. Among them, changing the way of internal materials will lead to uncontrollable cycle or rate performance changes, and changing the way of external structure will lead to a decrease in battery capacity and an in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M2/26H01M2/34H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 陈英龙成龙高金辉张俊玉伍绍中
Owner TIANJIN LISHEN BATTERY
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