Device for accurate detection of remaining discharge capacities of a plurality of batteries
First Claim
1. A charge state detecting device for a battery device comprising:
- a battery device including a plurality of batteries connected in series;
current detection means for detecting current flowing out of said battery device;
voltage detection means for detecting a respective battery voltage of each individual battery of said plurality of batteries;
capacity calculating means for calculating a respective electric power supplying capacity of each individual battery of said plurality of batteries based on said current and said respective battery voltage of each individual battery of said plurality of batteries; and
capacity determination means for determining a minimum capacity among said respective electric power supplying capacities of each individual battery of said plurality of batteries and for setting said minimum capacity as an overall electric power supplying capacity of said battery device.
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Accused Products
Abstract
A charge state detecting device has a battery device including a plurality of batteries connected in series, a current sensor which detects a current flowing from the battery device, and a voltage sensor which detects the voltage of each of the batteries. A main controller calculates a correlation between discharge current and battery voltage, and provides an estimated voltage of each battery of the batteries under a constant energy discharge, based on the correlation. The estimated voltages for the batteries are used for deriving the capacity of each battery with reference to a voltage-capacity characteristic, which is stored in advance. The main controller supplies to a display indicator the minimum one of the derived capacities to warn of an impending need to charge the batteries.
50 Citations
20 Claims
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1. A charge state detecting device for a battery device comprising:
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a battery device including a plurality of batteries connected in series; current detection means for detecting current flowing out of said battery device; voltage detection means for detecting a respective battery voltage of each individual battery of said plurality of batteries; capacity calculating means for calculating a respective electric power supplying capacity of each individual battery of said plurality of batteries based on said current and said respective battery voltage of each individual battery of said plurality of batteries; and capacity determination means for determining a minimum capacity among said respective electric power supplying capacities of each individual battery of said plurality of batteries and for setting said minimum capacity as an overall electric power supplying capacity of said battery device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A charge state detecting device for a battery device including a plurality of batteries, said charge state detecting device comprising:
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an interface that receives detected values relating to a capacity of each of said plurality of batteries to supply electric power; a controller that calculates a plurality of remaining capacity values for each of said plurality of batteries, respectively, based on said detected values, and determines which of said batteries have the least remaining capacity to supply electric power. - View Dependent Claims (17)
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18. A rechargeable device for supplying electric power to a load, comprising:
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a battery device including a plurality of batteries connected in series together; sensors that detect electrical parameters of each of said batteries of said battery device; and a controller coupled to said sensors that determines a plurality of remaining capacity values for each of said plurality of batteries, respectively, based on said detected electrical parameters, and determines which of said plurality of batteries have the least remaining capacity for supplying electric power based on said remaining capacity values. - View Dependent Claims (19, 20)
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Specification