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Layered secondary battery

A storage battery and negative electrode technology, applied in secondary batteries, small-size batteries/battery packs, large-size batteries/battery packs, etc., can solve the problem of separators electrically contacting the shell, etc.

Active Publication Date: 2011-10-05
ENVISION AESC ENERGY DEVICES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Separators used in these batteries may experience heat shrink and may electrically contact the case

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0060] A slurry consisting of 63 parts by mass of lithium-manganese composite oxide, 4.2 parts by mass of acetylene black (number average particle size of 7 μm), 2.8 parts by mass of polyvinylidene fluoride, and 50 parts by mass of N-methyl-2-pyrrolidone.

[0061] The slurry was applied across the width of the 20 micron thick, 150 mm wide aluminum foil as a current collector and intermittently along the length of the foil over a length of 130 mm, with the uncoated length being 20mm. The coated collector was dried and pressed to form a 180 micron thick positive electrode active material layer.

[0062] An electrode lead terminal of 13 mm wide by 17 mm long was formed in each uncoated area so that the positive electrode was coated in its 65 mm wide by 125 mm long area.

[0063] Each positive electrode was covered with a 25 micron thick polypropylene separator and bonded to the separator by heat fusion on the 1.5 mm end of the positive electrode.

[0064] Next, a 30-micron-thi...

example 1

[0068] Ten lithium ion batteries were produced in the same manner as in Example 1, except that the synthetic resin tape with an adhesive layer was not applied across the junction area of ​​the separator. In the same overcharge test, 4 of the Li-ion cells produced produced smoke when charged to 25V at 1C current.

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Abstract

Provided are layered secondary batteries with improved overcharge characteristics. In the layered secondary batteries, a laminate of stacked battery elements is sealed with an outer packaging film. In the laminate, either a plate-like positive electrode or plate-like negative electrode is housed in a bag-shaped separator such that the direction of lead-out of the positive electrode lead terminal or the negative electrode lead terminal coincides with the mechanical direction of the separator, a synthetic resin film that crosses the edge that coincides with the mechanical direction of the separator, the adhesion strength of which is greater than the heat-shrink stress of the separator and the softening point of which is higher than that of the separator, is glued on both outside surfaces of the bag-shaped separator, and the positive or negative electrode housed in the bag-shaped separator and the counterelectrode that is not contained in the bag-shaped separator are in opposition.

Description

technical field [0001] The present invention relates to a stacked secondary battery containing a battery element obtained by stacking a flat plate-shaped positive electrode and a negative electrode, the battery element being sealed in a film-shaped case. A positive or negative electrode is contained in a pouch-shaped separator and stacked with the corresponding counter electrode. Background technique [0002] Lithium-ion batteries and other large charge-discharge capacity batteries are widely used in a variety of portable battery-powered devices, including cellular phones. Efficient accumulators with a large charge-discharge capacity are also required in such applications as electric vehicles, electric bicycles, electric tools and electrical energy storage. [0003] These high-power batteries use a stacked battery in which a flat positive electrode and a flat negative electrode are stacked together with a separator disposed between the flat positive electrode and the flat n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/02H01M2/18H01M10/0585H01M10/04H01M50/105H01M50/178H01M50/466H01M50/55
CPCY02E60/122H01M10/0525H01M2/1673H01M10/0436H01M2/30H01M10/0585H01M2/08H01M2/0212H01M2/18H01M2/0275Y02T10/7011H01M2/0207H01M2/06Y02E60/10H01M50/46Y02P70/50H01M50/105H01M50/466H01M50/55H01M50/178Y02T10/70
Inventor 大道寺孝夫座间浩一
Owner ENVISION AESC ENERGY DEVICES LTD
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