Lithium ion battery using prismatic can with recessed surfaces

Details Lithium ion battery using prismatic can with recessed surfaces Lithium ion battery using prismatic can with recessed surfaces

2000-08-22

2003-10-07

Kalafut, Stephen (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Plural concentric or single coiled electrode

C429S176000

Reexamination Certificate

active

06630270

ABSTRACT:

BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a prismatic lithium ion battery, more particularly to a prismatic lithium ion battery, wherein a jelly roll of a lithium ion battery is mounted and electrolyte is infused into a prismatic can.
(b) Description of the Related Art
The conventional cylindrical lithium ion battery is undergoing a transition into a rectangular shape for use in smaller and thinner portable electronic appliances while at the same time the battery used in such portable electronic appliances is being changed from a nickel hydrogen battery to a lithium ion battery.
However, when comparing prismatic lithium ion batteries with cylindrical lithium ion batteries, the prismatic battery packs have post-assembly charge and discharge cycles problems causing damage to themselves as well as the electronic appliance in which they are used. Additionally, during the initial charge and discharge these prismatic batteries generate gas so that pressure can build up in the battery. Furthermore, when the repeated charges and discharges cause electrode swelling, the external surface of the protective can is deformed so that there is a great amount of swelling with the result of deteriorating the safety characteristics of the battery.
Therefore, a method for restraining can swelling due to gas pressure or electrode expansion caused by charging and discharging is required for conventional prismatic battery cans.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a prismatic lithium ion battery which improves the safety of a battery itself as well as that of the battery pack by using a can which can withstand the internal pressure of a battery. This is done in order to restrain the swelling of a can surface so that battery volume changes due to electrode expansion and internal battery pressure increases are contained.
Furthermore, it is an other object of the present invention to improve the battery cycle life characteristics by alleviating jelly roll deformations caused by the expansion and contraction of a lithium ion battery jelly roll due to continuous charging and discharging so that the lithium metal can be uniformly and stably adsorbed in and detached from a jelly roll.


REFERENCES:
patent: 5549717 (1996-08-01), Takeuchi et al.
patent: 5556722 (1996-09-01), Narukawa et al.
patent: 5803933 (1998-09-01), Kilb
patent: 6083640 (2000-07-01), Lee et al.
patent: 6232015 (2001-05-01), Wyser
patent: 6-352649 (1994-12-01), None
patent: 10-284015 (1998-10-01), None

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