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Lithium secondary battery

A lithium secondary battery and electrolyte technology, applied in secondary batteries, lithium storage batteries, batteries, etc., can solve problems such as electrolyte leakage

Pending Publication Date: 2021-07-23
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when manufacturing a smart card or the like equipped with a lithium secondary battery, the lithium secondary battery is compressed during the above-mentioned thermal lamination, and the electrolyte solution filled inside the battery may leak to the outside of the battery.

Method used

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Embodiment Construction

[0031] figure 1 It is a cross-sectional view showing the configuration of lithium secondary battery 1 according to one embodiment of the present invention. figure 2 is a plan view of the lithium secondary battery 1 . figure 1 In the diagram, the lithium secondary battery 1 and its configuration are drawn thicker than they actually are in order to make the drawing easier to understand. should be explained, figure 1 In , a part of the structure on the nearer side and the back side than the cross section is shown together. image 3 is also the same.

[0032] The lithium secondary battery 1 is a small and thin battery. The planar shape of the lithium secondary battery 1 is, for example, substantially rectangular. For example, the longitudinal length of the lithium secondary battery 1 in plan view is 10 mm to 46 mm, and the lateral length is 10 mm to 46 mm. The thickness of the lithium secondary battery 1 (ie, figure 1 The thickness in the vertical direction) is, for exampl...

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Abstract

An external body (6) of a lithium secondary battery (1) includes a coated region (67) and an outer peripheral region (68). The coated region (67) is a rectangular region in which a positive electrode (2), a separator (4), and a negative electrode (3) overlap in an overlapping direction. The outer peripheral region (68) is a rectangular frame-like region that surrounds the coated region (67). First regions (681) of the outer peripheral region (68) are belt-like regions that extend along a pair of long sides (691). In the first regions (681), a first sheet portion (65) and a second sheet portion (66) are bonded. A second region (682) is a belt-like region that extends along the coated region (67) between at least one of the pair of the first regions (681) and the coated region (67). In the second region (682), the first sheet portion (65) and the second sheet portion (66) contact each other or are in close proximity to each other without being bonded. Thus, leakage of an electrolyte (5) outside the lithium secondary battery (1) can be suppressed.

Description

technical field [0001] The present invention relates to a thin lithium secondary battery. Background technique [0002] Conventionally, thin batteries have been mounted on various devices and used as power supply sources. For example, Japanese Patent Application Laid-Open No. 2016-139494 (Document 1) discloses a laminated battery including a laminated member obtained by laminating two films, and a single cell accommodated between the two films. In this laminated battery, the peripheral portion of the laminated member is folded for the purpose of reducing the size of the battery storage space in a device on which the laminated battery is mounted. [0003] Also, in the laminated exterior battery of JP-A-2015-153513 (Document 2), both side portions of the laminated exterior are bent at 90° for the purpose of improving space efficiency. In the laminated exterior battery disclosed in Japanese Patent Laid-Open No. 2009-32612 (Document 3), both side portions of the laminated film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M10/052H01M50/103H01M50/247H01M50/105
CPCH01M4/131Y02E60/10Y02P70/50H01M10/0525H01M10/0585H01M50/105H01M2004/028H01M4/0471H01M2220/30H01M4/505H01M4/525H01M50/14H01M50/124H01M50/178H01M10/058H01M10/052H01M50/238H01M50/553
Inventor 日比野真彦水上俊介中西贵大藤田雄树
Owner NGK INSULATORS LTD
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