System for enhanced lithium-ion battery performance at low...

Details System for enhanced lithium-ion battery performance at low... System for enhanced lithium-ion battery performance at low...

2001-08-09

2004-09-28

Yuan, Dah-Wei (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

With heat exchange feature

C429S149000, C429S153000, C429S159000, C429S163000, C062S457700

Reexamination Certificate

active

06797427

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to battery systems and, more particularly, to a battery system adapted for use at varying temperatures.
2. Description of the Prior Art
Present lithium-ion (Li-ion) cells demonstrate low operating efficiency, and a corresponding low discharge capacity, at temperatures below 20° C. While a Li-ion cell may demonstrate a low discharge capacity at a low temperature, it will recover to a normal discharge capacity when the ambient temperature returns to a higher value.
Li-ion cells generate heat during discharge. Therefore, insulating a Li-ion cell during use at low temperatures causes the cell to demonstrate a higher discharge capacity than if it were uninsulated. However, maintaining the insulation on the cell when the cell is used in a higher temperature environment could have negative effects on the cell because of excess accumulation of heat.
Therefore, there is a need for an apparatus that retains heat in Li-ion cells while operating at relatively low temperatures, and that conducts heat from the cells while operating at higher temperatures.


REFERENCES:
patent: 6192703 (2001-02-01), Salyer et al.
patent: 6468689 (2002-10-01), Hallaj et al.
Datasheet For CoolPhase MPC-120, Lord Chemical Products, Aug. 22, 2001.

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