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Lithium ion secondary battery and method for manufacturing the same

A technology of secondary battery and manufacturing method, which is applied in secondary battery, electrolyte storage battery manufacturing, battery pack components and other directions, can solve problems such as diaphragm size deviation, and achieve the effect of suppressing deviation

Inactive Publication Date: 2016-10-12
AUTOMOTIVE ENERGY SUPPLY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shrinkage will cause a deviation in the size of the diaphragm

Method used

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  • Lithium ion secondary battery and method for manufacturing the same
  • Lithium ion secondary battery and method for manufacturing the same
  • Lithium ion secondary battery and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] The PP porous material of Example 1 was irradiated (ie, crosslinked) with a predetermined irradiation dose of electron beams.

[0130] The separator of Example 1 is a crosslinked separator obtained by cutting the crosslinked PP porous material with a hot knife at 200°C.

[0131] In Example 1, the heat shrinkage rate of the sample 1 after being left to stand in the atmosphere of 150 degreeC for 1 hour was 1%, and the variation of the dimension of the cut surface of the sample 2 was 0.02 mm.

[0132] In addition, in Example 1, the region located 2 mm from the cut surface of sample 2 (for example, image 3 The porosity of the area P1) is about 50%, and it is located in the area 0.1 mm away from the cut surface of the sample 2 (for example image 3 The porosity of the region P2) is about 0%.

Embodiment 2

[0134] The PP porous material of Example 2 was irradiated with electron beams at a lower dose than that of Example 1 (that is, crosslinked).

[0135] The separator of Example 2 is a crosslinked separator obtained by cutting the crosslinked PP porous material with a hot knife at 200°C.

[0136] In Example 2, the heat shrinkage rate of the sample 1 after being left in the atmosphere of 150 degreeC for 1 hour was 3%, and the variation of the dimension of the cut surface of the sample 2 was 0.05 mm.

[0137] In addition, in Example 2, the area located 2 mm from the cut surface of the sample 2 (for example, image 3 The porosity of the area P1) is about 50%, and it is located in the area 0.1 mm away from the cut surface of the sample 2 (for example image 3 The porosity of the region P2) is about 0%.

[0138] Compared with Example 1, in Example 2, the thermal shrinkage rate of Sample 1 and the dimension of the cut surface of Sample 2 are more varied.

Embodiment 3

[0140] The PP porous material of Example 3 was irradiated with electron beams at a lower dose than that of Example 2 (that is, crosslinked).

[0141] The separator of Example 3 is a crosslinked separator obtained by cutting the crosslinked PP porous material with a hot knife at 200°C.

[0142] In Example 3, the heat shrinkage rate of the sample 1 after being left to stand in the atmosphere of 150 degreeC for 1 hour was 10%, and the variation of the dimension of the cut surface of the sample 2 was 0.08 mm.

[0143] In addition, in Example 3, the area located 2 mm from the cut surface of sample 2 (for example, image 3 The porosity of the area P1) is about 50%, and it is located in the area 0.1 mm away from the cut surface of the sample 2 (for example image 3 The porosity of the region P2) is about 0%.

[0144] Compared with Example 1 and Example 2, in Example 3, the thermal shrinkage rate of Sample 1 and the dimension of the cut surface of Sample 2 are more varied.

[0145]...

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Abstract

The invention relates to a lithium ion secondary battery and a method for manufacturing the same. The lithium ion secondary battery includes: a positive electrode extending along a first direction; a negative electrode extending along the first direction and disposed opposite to the positive electrode along a second direction orthogonal to the first direction; and a separator with a crosslinked structure, extending along the first direction and provided between the positive electrode and the negative electrode. The separator includes an opposite region opposite to the positive electrode and the negative electrode along the second direction, and a surplus region not opposite to the positive electrode and / or the negative electrode along the second direction, and the surplus region has lower porosity than the opposite region.

Description

[0001] Cross References to Related Applications [0002] This application claims the priority of Japanese Patent Application No. 2015-062115 submitted to the Japan Patent Office on March 25, 2015, and therefore the entire content of said Japanese Patent Application is incorporated herein by reference. technical field [0003] The invention relates to a lithium ion secondary battery and a manufacturing method thereof. Background technique [0004] A lithium ion secondary battery includes a power generating element including a stacked positive electrode, a separator, and a negative electrode. [0005] The separator has a function of retaining an electrolytic solution for ensuring lithium ion conductivity between the positive electrode and the negative electrode, and a function of preventing short circuit between the positive electrode and the negative electrode. In order to realize the function, the separator is fabricated in a manner sufficiently large (ie, in a manner inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/18H01M10/0525H01M10/058H01M50/406H01M50/417H01M50/463
CPCH01M10/0525H01M10/058H01M50/463H01M50/417H01M50/406H01M10/0585Y02E60/10H01M50/46Y02P70/50
Inventor 坂口真一郎木村爱佳水田政智
Owner AUTOMOTIVE ENERGY SUPPLY
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