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Secondary cell

A technology for secondary batteries and battery cans, applied in secondary batteries, batteries, lithium batteries, etc., can solve the problems of low sealing speed and high cost of laser devices, and achieve fast double seam processing, high energy density, and excellent operability Effect

Inactive Publication Date: 2013-02-06
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the case of the sealing method using laser welding, the cost of the laser device is high and the sealing speed is low

Method used

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Examples

Experimental program
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Effect test

Embodiment ）

[0084] [Produce positive electrode plate]

[0085] LiFePO to be used as positive electrode active material 4 (88% by weight), carbon black (5% by weight) as a conductive material, styrene-butadiene rubber (6% by weight) as a binder (binding material), and Carboxymethyl cellulose (1% by weight) is mixed; N-methyl-2-pyrrolidone is appropriately added as a solvent to prepare a slurry; and the slurry is evenly coated on an aluminum foil (thickness: 20 μm) on both surfaces, and dry. The obtained article was compressed using rolling and cut to a predetermined size, thereby producing a plate-shaped positive electrode plate 2 .

[0086] The resulting positive electrode plate measured 150 mm x 340 mm and had a thickness of 400 μm. Fifty such positive electrode plates 2 were used.

[0087] [Generation of negative plate]

[0088] Natural graphite (98% by weight) used as a negative electrode active material, styrene-butadiene rubber (1% by weight) used as a binder (binding material), a...

Embodiment 1）

[0101] adopted according to figure 2 The structure of the secondary battery RB1A in the aforementioned first embodiment is shown, and a design with a corner radius of 20 is adopted. The secondary battery is double seamed and sealed. In this process, a polyolefin-based sealant having resistance to electrolyte is applied to the seamed portion, and double seaming is performed.

Embodiment 2）

[0103] adopted according to image 3 The shown structure of the secondary battery RB1B of the aforementioned second embodiment adopts a can structure in which the seam protrudes in the longitudinal direction, and adopts a design with a radius of 20 at the corner. The secondary battery is double seamed and sealed. In this process, a polyolefin-based sealant having resistance to electrolyte is applied to the seamed portion, and double seaming is performed.

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Abstract

Provided is a secondary cell in which the production takt time can be improved, airtightness of a cell canister is exhibited, cell capacity can be increased, and excellent handling properties can be obtained. A secondary cell comprising an electrode group (1); an exterior case (11); and a cell canister (10) comprising the exterior case (11) and a lid member (12), the interior of which canister being filled with an electrolyte, and airtightness being achieved; the secondary cell being constituted such that the cell canister (10) comprises a electrode group accommodating part and a peripheral edge section in which the exterior case (11) and the lid member (12) are double-seamed and sealed; and the peripheral edge section is provided so as to bulge outward from the electrode group accommodating part, and has an appropriately sized corner R corresponding to the plate thickness of plates to be double-seamed and exhibiting airtightness.

Description

technical field [0001] The present invention relates to a secondary battery, and particularly to a secondary battery having a battery can structure that seals a battery can for accommodating an electrode group in a reliable manner, that is portable and has excellent handling performance. Background technique [0002] In recent years, lithium secondary batteries have been used as batteries for powering cellular phones, notebook computers, and other portable electronic instruments because the batteries have high energy density and can be reduced in size and weight. Also, since a high capacity can be obtained, the battery is attracting interest as a motor drive power source for electric vehicles (EV), hybrid electric vehicles (HEV), and the like, and as a storage battery for storing electrical energy. [0003] The above-mentioned lithium secondary battery has a configuration in which an electrode group in which a positive electrode plate and a negative electrode plate are arra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M2/04H01M10/052H01M50/15H01M50/169
CPCH01M2/0469H01M2/02Y02E60/122H01M10/0525H01M2/0408Y02E60/12H01M10/052H01M2/04Y02T10/7011H01M2220/30Y02E60/10Y02P70/50H01M50/15H01M50/169
Inventor 佃至弘冈野哲之
Owner SHARP KK
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