Battery inactivation detection device

Details Battery inactivation detection device Battery inactivation detection device

1999-05-14

2001-08-21

Wong, Peter S. (Department: 2838)

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

Reexamination Certificate

active

06278280

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to detection of a cell which has become inactive in a multi-cell battery.
BACKGROUND OF THE INVENTION
When the activity of a battery cell is lost due to minute short-circuits in a multi-cell battery, it is difficult to detect the inactive cell simply from the terminal voltage.
Tokkai Hei 9-84274 published by the Japanese Patent Office in 1997 provides a voltage detecting circuit for each cell, wherein charging/discharging is performed while monitoring the voltage of each cell.
SUMMARY OF THE INVENTION
When a voltage detecting circuit was provided for every cell, the cost of the battery is inevitably increased.
It is therefore an object of this invention to provide a detecting device for detecting a cell which has become inactive.
In order to achieve the above object, this invention provides an inactivity detecting device for detecting a cell which has become inactive in a multi-cell battery comprising plural cells. The device comprises an inactivity detecting circuit connected with a cell in parallel. The inactivity detecting circuit comprises a signal generator and a diode connected in series.
This invention also provides a device for detecting the inactivity of battery modules, each comprising plural cells connected in series, in a multi-cell battery. The device comprises an inactivity detecting circuit connected with a module in parallel. The inactivity detecting circuit comprises a signal generator and a diode connected in series.
This invention also provides a method for detecting an inactivity of a cell in a multi-cell battery comprising plural cells. The method comprises connecting an inactivity detecting circuit with the cell in parallel. The inactivity detecting circuit comprises a signal generator and a diode connected in series. The inactivity of the cell is then detected from a signal generated by the signal generator.
The details as well as other features and advantages of this invention are set forth in the remainder of the specification and are shown in the accompanying drawings.


REFERENCES:
patent: 5469042 (1995-11-01), Riihling
patent: 5705914 (1998-01-01), Morita
patent: 9-84274 (1997-03-01), None

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