Internal short detection apparatus for secondary-battery, internal short detection method for secondary-battery, battery-pack, and electronic equipment
First Claim
1. A secondary-battery internal short detection apparatus which detects an internal short in a secondary-battery, comprising:
- an electricity-quantity storage circuit which stores a reference electricity-quantity necessary for charging the secondary-battery from a first voltage to a second voltage higher than the first voltage;
an electricity-quantity accumulation circuit which measures an accumulative electricity-quantity necessary for charging the secondary-battery from the first voltage to the second voltage; and
an internal short detection circuit which compares the accumulative electricity-quantity measured by the electricity-quantity accumulation circuit and the reference electricity-quantity stored in the electricity-quantity storage circuit, if the accumulative electricity-quantity is larger than the reference electricity-quantity, then decides that an internal short is generated, and if the accumulative electricity-quantity is equal to, or smaller than, the reference electricity-quantity, then decides that an internal short is not generated and rewrites the reference electricity-quantity stored in the electricity-quantity storage circuit into the accumulative electricity-quantity.
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Accused Products
Abstract
A secondary-battery internal short detection apparatus is provided which is capable of precisely detecting an internal short being generated in a secondary-battery. In this apparatus: an electricity-quantity storage circuit stores in advance a reference electricity-quantity necessary for charging the secondary-battery from a first voltage to a second voltage; an electricity-quantity accumulation circuit measures an accumulative electricity-quantity necessary for charging the secondary-battery from the first voltage to the second voltage; and an internal short detection circuit compares the accumulative electricity-quantity measured by the electricity-quantity accumulation circuit and the reference electricity-quantity stored in the electricity-quantity storage circuit, if the accumulative electricity-quantity is larger than the reference electricity-quantity, then decides that an internal short is generated, and if the accumulative electricity-quantity is equal to, or smaller than, the reference electricity-quantity, then without deciding that an internal short is generated, rewrites the reference electricity-quantity stored in the electricity-quantity storage circuit into the accumulative electricity-quantity.
51 Citations
11 Claims
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1. A secondary-battery internal short detection apparatus which detects an internal short in a secondary-battery, comprising:
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an electricity-quantity storage circuit which stores a reference electricity-quantity necessary for charging the secondary-battery from a first voltage to a second voltage higher than the first voltage;
an electricity-quantity accumulation circuit which measures an accumulative electricity-quantity necessary for charging the secondary-battery from the first voltage to the second voltage; and
an internal short detection circuit which compares the accumulative electricity-quantity measured by the electricity-quantity accumulation circuit and the reference electricity-quantity stored in the electricity-quantity storage circuit, if the accumulative electricity-quantity is larger than the reference electricity-quantity, then decides that an internal short is generated, and if the accumulative electricity-quantity is equal to, or smaller than, the reference electricity-quantity, then decides that an internal short is not generated and rewrites the reference electricity-quantity stored in the electricity-quantity storage circuit into the accumulative electricity-quantity. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11)
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6. A secondary-battery internal short detection method for detecting an internal short in a secondary-battery, comprising:
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an electricity-quantity accumulating step of measuring an accumulative electricity-quantity necessary for charging the secondary-battery from a first voltage to a second voltage higher than the first voltage;
an electricity-quantity comparing step of comparing the accumulative electricity-quantity measured in the electricity-quantity accumulating step and a reference electricity-quantity which is stored in advance in an electricity-quantity storage circuit and is necessary for charging the secondary-battery from the first voltage to the second voltage;
an internal short detecting step of deciding that an internal short is generated, if the accumulative electricity-quantity is larger than the reference electricity-quantity in the electricity-quantity comparing step; and
a reference electricity-quantity rewriting step of deciding that an internal short is not generated and rewriting the reference electricity-quantity stored in the electricity-quantity storage circuit into the accumulative electricity-quantity, if the accumulative electricity-quantity is equal to, or smaller than, the reference electricity-quantity in the electricity-quantity comparing step.
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Specification