Fault determination apparatus and fault determination method for a battery set
First Claim
1. A fault determination apparatus for a battery set for determining fault of a battery set comprising a plurality of serially connected cells, the apparatus comprising:
- a voltmeter for measuring the voltage of each of the plurality of serially connected cells;
an ammeter for measuring electric current passing through said battery set; and
a fault determination means for receiving input voltage values measured by said voltmeter at a predetermined timing, computing a voltage difference between the maximum and the minimum values of said voltage, inputting the value of electric current measured by said ammeter at the same timing with said predetermined timing, storing a plurality of value pairs containing said electric current and said computed voltage difference, and determining fault of said battery set on the basis of the stored value pairs.
1 Assignment
0 Petitions
Accused Products
Abstract
By finding a voltage difference ΔV between the maximum value and the minimum value of voltage of each cell constituting a battery set and then combining the voltage difference ΔV 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 ΔV and the current I is a relation represented by a straight line with the slope ΔR thereof corresponding to an internal-resistance difference. Therefore, fault in the battery set can be determined from the magnitude of the slope ΔR 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 ΔV is determined.
25 Citations
22 Claims
-
1. A fault determination apparatus for a battery set for determining fault of a battery set comprising a plurality of serially connected cells, the apparatus comprising:
-
a voltmeter for measuring the voltage of each of the plurality of serially connected cells;
an ammeter for measuring electric current passing through said battery set; and
a fault determination means for receiving input voltage values measured by said voltmeter at a predetermined timing, computing a voltage difference between the maximum and the minimum values of said voltage, inputting the value of electric current measured by said ammeter at the same timing with said predetermined timing, storing a plurality of value pairs containing said electric current and said computed voltage difference, and determining fault of said battery set on the basis of the stored value pairs. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A fault determination method for a battery set for determining fault of a battery set comprising a plurality of serially connected cells, the method comprising the steps of;
-
measuring voltage of each of the plurality of cells at a predetermined timing, computing a voltage difference between the maximum and the minimum values of the measured voltage, measuring electric current passing through the battery set at the same timing as said predetermined timing, storing a plurality of value pairs containing the measured electric current and said computed voltage difference, and determining fault of said battery set on the basis of the stored value pairs. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A fault determination apparatus for a battery set for determining fault of a battery set comprising a plurality of serially connected cells, the apparatus comprising:
-
a voltmeter that measures a voltage value of each of the plurality of serially connected cells;
an ammeter that measures electric current passing through the battery set;
an electronic processing device that controls the fault determination apparatus and executes a fault determination process;
a clock generating circuit that outputs a clock signal to the electronic processing device at a predetermined timing; and
a power supply that supplies power to each portion of the fault determination apparatus, wherein the electronic processing device receives input voltage values measured by the voltmeter at the predetermined timing, computes a voltage difference between the maximum and the minimum values of the voltage, receives the value of electric current measured by the ammeter at the predetermined timing, stores a plurality of value pairs containing the electric current and the computed voltage difference, determines fault of the battery set on the basis of the stored pairs and outputs fault determination signals to at least a display.
-
-
16. A fault determination apparatus for a battery set for determining fault of a battery set comprising a plurality of serially connected cells, the apparatus comprising:
-
a voltmeter that measures a voltage of each of the plurality of serially connected cells;
an ammeter that measures electric current passing through the battery set;
an electronic processing device that controls the fault determination apparatus and executes a fault determination process; and
a power supply that supplies power to each portion of the fault determination apparatus, wherein the fault determination process includes, receiving the input voltage values measured by the voltmeter at a predetermined timing interval, computing a voltage difference between the maximum and the minimum voltage values, receiving the value of the electric current measured by the ammeter at the predetermined timing, storing a plurality of value pairs containing the electric current and the computed voltage difference, determining fault of the battery set on the basis of the stored pairs and outputting fault determination signals to at least a display.
-
-
17. A fault determination apparatus for a battery set for determining fault of a battery set comprising a plurality of serially connected cells, the apparatus comprising:
-
a voltmeter that measures a voltage value of each of the plurality of serially connected cells;
an ammeter that measures electric current passing through the battery set;
a power supply that supplies power to each portion of the fault determination apparatus, and a fault determinator that receives voltage values measured by the voltmeter at a predetermined timing, computes a voltage difference between the maximum and minimum values of the voltage, receives the value of electric current measured by the ammeter at the predetermined timing, stores a plurality of value pairs containing the electric current and the computed voltage difference and determines fault of the battery set on the basis of the stored pairs. - View Dependent Claims (18, 19)
-
- 20. An electronic processing apparatus for determining a fault of a battery set comprising a plurality of serially connected cells, wherein the electronic processing apparatus receives voltage values of each of the plurality of serially connected cells at the predetermined timing, computes a voltage difference between the maximum and minimum values of the voltage, receives the value of electric current passing through the battery set at a predetermined timing, stores a plurality of value pairs containing electric current and the computed voltage difference and determines fault of the battery set on the basis of the stored pairs.
Specification