Fault determination apparatus and fault determination method...

Details Fault determination apparatus and fault determination method... Fault determination apparatus and fault determination method...

G - Physics

01

R

G01R 31/36 (2006.01)

Patent

CA 2300455

By finding a voltage difference .DELTA.V between the maximum value and the minimum value of voltage of each cell constituting a battery set and then combining the voltage difference .DELTA.V with current I passing through the battery set into a value pair and store a plurality of the value pairs, the relationship between the voltage difference .DELTA.V and the current I is a relation represented by a straight line with the slope .DELTA.R thereof corresponding to an internal-resistance difference. Therefore, fault in the battery set can be determined from the magnitude of the slope .DELTA.R computed by a least- squares method. Fault determination for a battery set is made more accurate because variations in electromotive force caused by charge-and-discharge patterns and by changes in temperature are canceled when the voltage difference .DELTA.V is determined.

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