Charging method and charging system

Abstract

Use start date-and-time is input by use of U1. Times T1 and T2 to achieve SOC 1 and SOC 2 are set. Charging is started at T2 and is continued until it is determined that SOC 2 is achieved. Thereafter, charging is started at T1 and continued until it is determined that SOC 1 is achieved by the input use start date-and-time.

Description

technical field [0001] The present invention relates to a charging system and a charging method, particularly a charging system and a charging method for charging a secondary battery whose capacity deterioration is more accelerated as the state of charge becomes higher. Background technique [0002] Certain batteries, such as lithium-ion batteries, may experience accelerated capacity degradation when stored in a fully charged state. Lithium-ion batteries are installed in hybrid cars, electric vehicles, and the like. In these cases, the acceleration of capacity degradation may affect distance-to-empty, among other things. [0003] Japanese Patent Application Publication No. 2009-118652 discloses a charging technique for such an in-vehicle battery. This technique includes a communication relay device for communicably connecting an electric vehicle with a power server provided in a user's residence, so that a battery can be charged at a lower electricity price in the user's r...

AI Technical Summary

Problems solved by technology

[0004] However, the technique disclosed in Japanese Patent Application Laid-Open No. 2009-118652 has a problem that since the battery is kept in a fully charged state between the time when charging is completed and the designated time for charging completion, the deterioration of the secondary battery is accelerated.

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