Method of state-of-charge indication by measuring the thickness

Details Method of state-of-charge indication by measuring the thickness Method of state-of-charge indication by measuring the thickness

1994-07-07

1995-08-01

Dougherty, Thomas M.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 48, H01M 1048

Patent

active

054382491

ABSTRACT:
The state of charge of a cell that has flexible packaging and that expands and contracts with variations in state of charge is determined by measuring changes in thickness of the cell. The invention is particularly applicable to cells having a flat geometry. A battery having a state-of-charge indicator includes at least one battery cell free to expand and contract with variations in state of charge of the battery cell and a device for measuring expansion or contraction of the battery cell, a resulting measurement indicating the state of charge of the battery cell. By measuring expansion or contraction of the battery the state of charge of a battery may be readily detected. The measurement may be directly displayed so as to be visually observable, or a signal containing measurement information may be sent to a remote location to be displayed or used for control purposes. Expansion or contraction of the battery may be measured in various ways, including measuring physical displacement of the cell package or measuring a change in pressure exerted upon a member as a result of the expansion or contraction of the battery.

REFERENCES:
patent: 3933526 (1976-01-01), Rackin
patent: 4689544 (1987-08-01), Stadnick et al.
patent: 4879190 (1989-11-01), Lundsgaard
patent: 4895773 (1990-01-01), Bones et al.
patent: 4925751 (1990-05-01), Shackle et al.
patent: 4935317 (1990-06-01), Fauteux et al.
patent: 4997732 (1991-03-01), Austin et al.
patent: 5011501 (1991-04-01), Shackle et al.
patent: 5260638 (1993-11-01), Hirahara

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