| 摘要 |
PROBLEM TO BE SOLVED: To provide a temperature estimation method and a temperature estimation device capable of estimating the temperature of a lead acid battery accurately while charging.SOLUTION: In the temperature estimation method, calorific value Qis determined based on the internal resistance value and the charging current of a lead acid battery, by using a first internal resistance from the start of charging until the charging voltage reaches a predetermined value, and using a second internal resistance larger than the first internal resistance when the charging voltage reaches a predetermined value. The temperature of a lead acid battery, while charging, is determined according to a formula T=(1-α)×t+α×T+[(1-α)/&bgr;]×Q, where Tis the estimated temperature of a lead acid battery, Tis the temperature of a lead acid battery immediately before estimating the T, Qis the calorific value of a lead acid battery, tis the atmospheric temperature of a lead acid battery, and α and &bgr; are the coefficients representing thermal radiation and independent from the calorific value. |
