METHOD FOR ESTIMATING BATTERY DEGRADATION
First Claim
1. A method for estimating battery degradation, comprising:
- charging a battery with a constant current/constant voltage mixed charging procedure, wherein the battery is charged in a constant current mode when a terminal voltage of the battery has not reached a charging preset voltage, and the battery is charged in a constant voltage mode when the terminal voltage of the battery has reached the charging preset voltage; and
calculating a degradation index of the battery based on a transition point voltage, a transition point estimated open circuit voltage, a transition point current, and a transition point battery temperature at a transition from the constant current mode to the constant voltage mode during the constant current/constant voltage mixed charging procedure.
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Abstract
A method for estimating battery degradation is provided. In this method, a remaining capacity is obtained by looking up a device characteristic table according to a steady open circuit voltage of a battery. Besides, a constant current is provided to charge the battery, and when a terminal voltage of the battery reaches to a charging preset voltage, a constant voltage is provided to charge the battery. The transition point information at the transition from a constant current mode to a constant voltage mode, which includes a transition point estimated open circuit voltage, a transition point voltage, a transition point current and a transition point battery temperature, is analyzed based on voltage, current, temperature and capacity information measured during the charging process. A battery degradation index is calculated from the transition point information.
21 Citations
12 Claims
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1. A method for estimating battery degradation, comprising:
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charging a battery with a constant current/constant voltage mixed charging procedure, wherein the battery is charged in a constant current mode when a terminal voltage of the battery has not reached a charging preset voltage, and the battery is charged in a constant voltage mode when the terminal voltage of the battery has reached the charging preset voltage; and calculating a degradation index of the battery based on a transition point voltage, a transition point estimated open circuit voltage, a transition point current, and a transition point battery temperature at a transition from the constant current mode to the constant voltage mode during the constant current/constant voltage mixed charging procedure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for estimating battery degradation, comprising:
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charging a battery with a constant current/constant voltage mixed charging procedure, wherein the battery is charged in a constant current mode when a terminal voltage of the battery has not reached a charging preset voltage, and the battery is charged in a constant voltage mode when the terminal voltage of the battery has reached the charging preset voltage; recording a transition point current and a transition point battery temperature when the constant current/constant voltage mixed charging procedure switches from the constant current mode to the constant voltage mode; and detecting a variant current of the battery after the battery is charged in the constant voltage mode for a preset period of time, and calculating a degradation index based on the transition point current, the transition point battery temperature and the variant current. - View Dependent Claims (10, 11, 12)
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Specification