Service life estimation method for lead storage battery and power source system
First Claim
1. A service life estimation method for a lead storage battery,the method to be implemented by an estimation unit that estimates an estimated remaining service life of the lead storage battery, comprising:
- a storage step of storing an integral discharge threshold A that is a reference for determination of a service life of the lead storage battery under a standard condition with predetermined values of a surface temperature, a charge current, and a discharge current of the lead storage battery;
a calculation step of calculating an integral discharged capacity B by replacing the accumulated value of discharged capacity when the lead storage battery deteriorates to a level under actual conditions including actually measured values of the surface temperature, the charge current, and the discharge current of the lead storage batterywith an accumulated value of discharged capacity when the lead storage battery would deteriorate under said standard condition to substantially the same level as said deterioration level under the actual condition, anda subtraction step of obtaining a differential electric quantity A−
B by subtracting the integral discharged capacity B from the integral discharge threshold A; and
an estimation step of estimating the estimated remaining service life of the lead storage battery by using the differential electric quantity.
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Abstract
An estimation unit that estimates an estimated remaining service life of the lead storage battery implements: a storage step of storing an integral discharge threshold A that is a reference for determination of a service life of the lead storage battery under a standard condition with predetermined values of a surface temperature, a charge current, and a discharge current of the lead storage battery; a calculation step of calculating an integral discharged capacity B that represents an accumulated value of a discharged capacity of the lead storage battery under the actual conditions such as giving deterioration that same order as that occurring when the lead storage battery is repeatedly discharged under the standard conditions; a subtraction step of obtaining a differential electric quantity A−B by subtracting the integral discharged capacity B from the integral discharge threshold A; and an estimation step of estimating the estimated remaining service life of the lead storage battery by using the differential electric quantity.
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Citations
28 Claims
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1. A service life estimation method for a lead storage battery,
the method to be implemented by an estimation unit that estimates an estimated remaining service life of the lead storage battery, comprising: -
a storage step of storing an integral discharge threshold A that is a reference for determination of a service life of the lead storage battery under a standard condition with predetermined values of a surface temperature, a charge current, and a discharge current of the lead storage battery; a calculation step of calculating an integral discharged capacity B by replacing the accumulated value of discharged capacity when the lead storage battery deteriorates to a level under actual conditions including actually measured values of the surface temperature, the charge current, and the discharge current of the lead storage battery with an accumulated value of discharged capacity when the lead storage battery would deteriorate under said standard condition to substantially the same level as said deterioration level under the actual condition, and a subtraction step of obtaining a differential electric quantity A−
B by subtracting the integral discharged capacity B from the integral discharge threshold A; andan estimation step of estimating the estimated remaining service life of the lead storage battery by using the differential electric quantity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power source system, comprising:
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a lead storage battery as a power source; a charging device that charges the lead storage battery; and an estimation unit that estimates a remaining service life of the lead storage battery, wherein the estimation unit stores an integral discharge threshold A that is a reference for determination of a service life of the lead storage battery under a standard condition with predetermined values of a surface temperature, a charge current, and a discharge current of the lead storage battery, said estimation unit obtains an accumulated value of integral discharged capacity B by replacing the accumulated value of discharged capacity when the lead storage battery deteriorates to a level under actual conditions including actually measured values of the surface temperature, the charge current, and the discharge current of the lead storage battery with an accumulated value of discharged capacity when the lead storage battery would deteriorate under said standard condition to substantially the same level as said deterioration level under the actual condition, and said estimation unit estimates a remaining service life of the lead storage battery with the use of difference between the integral discharge threshold A and the integral discharged capacity B. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification