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Secondary battery having improved long-term reliability against moisture penetration

A technology for secondary batteries and moisture penetration, applied in the field of secondary batteries, can solve the problems of deterioration of sealing reliability, deterioration of performance of secondary batteries, deterioration of long-term storage stability, etc. Effect

Active Publication Date: 2014-04-30
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, if the sealing area is reduced due to the reduced sealing width, the sealing reliability of the pouch deteriorates, and the long-term storage stability deteriorates due to penetration of external moisture, which leads to deterioration in the performance of the secondary battery

Method used

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  • Secondary battery having improved long-term reliability against moisture penetration
  • Secondary battery having improved long-term reliability against moisture penetration
  • Secondary battery having improved long-term reliability against moisture penetration

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0087] The preparation has a discharge capacity of 5Ah and 30000mm 2 (120mm×250mm) pouch-type secondary battery with a battery area. The basic structure of the pouch-type secondary battery and the image 3 same as shown in .

[0088] A pouch package for manufacturing a secondary battery includes a substrate layer and a thermal bonding layer made of aluminum and modified polypropylene, respectively. The characteristic length of the sealed portion formed at the periphery of the pouch package during the sealing process was calculated to be 19 . At a temperature of 25° C. and a relative humidity of 80%, the content of moisture permeating into the secondary battery in one day was measured to be 0.4566 ppm / day. In addition, the total moisture penetration content for 15 years is estimated proportionally based on the moisture penetration content for that day. As a result of the estimation, the moisture permeation content for 15 years was calculated to be 2500 ppm. Based on the ca...

example 2

[0090] A pouch-type secondary battery was prepared under the same conditions as in Example 1 except that the sealing width of the sealing portion was adjusted during the sealing process of the secondary battery so that the characteristic length of the sealing portion was 18.

[0091] For the secondary battery of Example 2, at a temperature of 25° C. and a relative humidity of 80%, the content of moisture permeating into the secondary battery in one day was measured to be 0.4292 ppm / day. Based on the moisture penetration content for that day, the total moisture penetration content for 15 years was scaled and calculated to be 2350 ppm. In addition, by using the lookup table, the increase in resistance of the secondary battery corresponding to the case in which the moisture permeation content was 2350 ppm was estimated to be 7.40%.

example 3

[0093] A pouch-type secondary battery was prepared under the same conditions as in Example 1, except that the sealing width of the sealing portion was adjusted during the sealing process of the secondary battery so that the characteristic length of the sealing portion was 15.

[0094] For the secondary battery of Example 3, at a temperature of 25° C. and a relative humidity of 80%, the content of moisture penetrating into the secondary battery in one day was measured to be 0.3561 ppm / day. Based on the moisture penetration content for that day, the total moisture penetration content for 15 years was estimated proportionally and calculated as 1950 ppm. In addition, by using the look-up table, the increase in resistance of the secondary battery corresponding to the case in which the moisture permeation content was 1950 ppm was estimated to be 6.1%.

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Abstract

Disclosed in the present invention is a secondary battery having improved long-term reliability against moisture penetration. A pouch-type secondary battery according to the present invention is characterized by comprising: an electrode assembly having an electrode lead attached thereto; and a pouch packing material which accommodates the electrode assembly such that a portion of the electrode lead may be outwardly exposed and which has a sealing portion formed along an edge thereof, wherein the sealing portion has a characteristic length of 10 to 19mm2 / mm. According to the present invention, the characteristic length of the sealing portion of the pouch-type secondary battery is limited to a fixed range, thus limiting as much as possible a reduction in capacity of a secondary battery caused by the area occupied by the sealing portion while improving reliability against moisture penetration which might occur due to the long-term use of the secondary battery.

Description

technical field [0001] The present disclosure relates to a secondary battery, and more particularly, to a secondary battery having improved long-term reliability against moisture permeation. [0002] This application claims priority to Korean Patent Application No. 10-2011-0087808 filed in Korea on Aug. 31, 2011 and Korean Patent Application No. 10-2012-0096130 filed in Korea on Aug. 31, 2012, which disclose The contents are incorporated herein by reference. Background technique [0003] With active use of portable electric products such as video cameras, cellular phones, portable PCs, etc., secondary batteries mainly used as power sources of such products have become more important. In particular, because lithium secondary batteries have a high energy density per unit weight and allow rapid charging compared with other kinds of secondary batteries such as lead storage batteries, nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, etc. , so the lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/08H01M50/105H01M50/119H01M50/121H01M50/124H01M50/141H01M50/178H01M50/548H01M50/557
CPCH01M2/08H01M50/178H01M50/119H01M50/105H01M50/141H01M50/548H01M50/557H01M50/121H01M50/124Y02E60/10Y02P70/50H01M50/183
Inventor 金汝珍崔丞惇朴成焌
Owner LG ENERGY SOLUTION LTD
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