Secondary battery with an improved safety

A secondary battery, battery technology, applied in small-sized batteries/battery packs, lithium batteries, battery pack components, etc., can solve safety problems and other issues, and achieve the effect of suppressing heat generation and improving safety

Active Publication Date: 2006-08-23
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The series of exothermic reactions caused by this heat can cause safety concerns
[0009] Although the safety problem in the overcharged state can be solved by adding additives to the non-aqueous electrolyte,

Method used

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  • Secondary battery with an improved safety
  • Secondary battery with an improved safety
  • Secondary battery with an improved safety

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] 1M LiPF with an EC:EMC ratio of 1:2 6 solution as electrolyte, artificial graphite as anode, and LiCoO 2 used as the positive electrode. A 383562-sized lithium polymer cell was then fabricated by conventional methods, enclosed within an aluminum composite package. In this packing step, in order to connect the aluminum layer of the packing to the positive terminal, a part of the end film covering the positive terminal is removed, and then a metal aluminum sheet is inserted into the removed part and thermally fused. Batteries were produced in this way.

Embodiment 2

[0083] A battery was manufactured in the same manner as in Example 1, except that a metallic nickel sheet was inserted to connect the negative terminal to the aluminum layer of the package.

Embodiment 3

[0085] 1M LiPF with an EC:EMC ratio of 1:2 6 solution as electrolyte, artificial graphite as anode, and LiCoO 2 used as the positive electrode. A 383562-sized lithium polymer cell was then fabricated by conventional methods, enclosed within an aluminum composite package. In this packaging step, a part of the outer polymer layer of the packaging is removed to expose the aluminum layer to the outside, and then the exposed aluminum layer and the positive terminal are respectively welded to the aluminum sheet so that they are electrically connected to each other. Batteries were produced in this way.

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PUM

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Abstract

The present invention provides a secondary battery comprising a battery package which encloses the outer perimeter of the secondary battery and covers the entire outer surface of positive and negative electrodes and a portion of each terminal of the positive and negative electrodes, wherein the battery package is formed of a laminate film comprising an outer polymer layer, an inner aluminum layer and an adhesive layer formed on a portion of the inner surface of the aluminum layer, the aluminum layer of the battery package being electrically connected with either of the positive and negative terminals. In another aspect, the invention provides a secondary battery comprising a battery package which encloses the outer perimeter of the secondary battery and covers the entire outer surface of positive and negative electrodes and a portion of each terminal of the positive and negative electrodes, wherein the battery package is formed of a laminate film comprising an outer polymer layer, an inner aluminum layer and an adhesive layer formed on a portion of the inner surface of the aluminum layer, and further comprises at least one electrically conductive metal foil on at least one of the outer upper and lower surfaces thereof, and each of the electrically conductive metal foil is electrically connected with either of the positive and negative terminals. In the inventive secondary battery, current occurring in conditions such as nail penetration can flow to either the aluminum layer of the package or the metal foil outside the package so as to inhibit heat generation inside the battery, thus improving the safety of the battery.

Description

technical field [0001] The present invention relates to a secondary battery enclosed within a new battery packaging structure that improves battery safety. More specifically, the packaging of the present invention can be used in lithium secondary batteries, especially lithium polymer batteries. Background technique [0002] Recently, lithium secondary batteries using nonaqueous electrolytes have been increasingly used as power sources for portable electronic devices due to their high voltage, high capacity, high output, and low weight. However, such lithium secondary batteries have a safety problem, and research to try to solve the problem is underway. When a lithium secondary battery is overcharged, excess lithium flows out of the positive electrode and enters the negative electrode, while highly reactive lithium metal deposits on the surface of the negative electrode and makes the positive electrode thermally unstable. This causes a rapid exothermic reaction due to a dec...

Claims

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Application Information

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IPC IPC(8): H01M2/30H01M2/34
CPCY02E60/122Y02E60/10H01M10/052H01M50/124H01M50/543H01M50/572H01M50/119H01M50/121
Inventor 柳德铉安谆昊李汉浩李在宪张民哲郑俊溶
Owner LG ENERGY SOLUTION LTD
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