Battery charging method
First Claim
1. A method for charging a battery, comprising the steps of:
- detecting a battery temperature at the start of the charging;
setting a value of an upper limit of the battery temperature during charging;
determining a maximum value for a battery charge current such that said battery temperature during charging does not exceed said value of the upper limit of the battery temperature, based on said battery temperature at the start of the charging and characteristics of battery temperature increase caused by charge current; and
charging said battery based on said maximum value for the battery charge current.
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Accused Products
Abstract
A reduction in charging time is achieved while suppressing any deterioration in the lifetime of the battery. A battery temperature increase margin is determined from the battery temperature at charge commencement and the upper limit value of the battery temperature. Moreover, the target charging capacity is determined from the initial state of charge at charge commencement and the target state of charge at charge completion. Furthermore, a value of an upper limit of the battery temperature increase is determined from these. Then, the battery charge current maximum value is set by map referral based on the value of an upper limit of the battery temperature increase such that the temperature of the battery during charging does not exceed the upper limit value. A driver performs the battery charging using a charge current value that has been set on the basis of the battery charge maximum value.
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Citations
3 Claims
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1. A method for charging a battery, comprising the steps of:
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detecting a battery temperature at the start of the charging;
setting a value of an upper limit of the battery temperature during charging;
determining a maximum value for a battery charge current such that said battery temperature during charging does not exceed said value of the upper limit of the battery temperature, based on said battery temperature at the start of the charging and characteristics of battery temperature increase caused by charge current; and
charging said battery based on said maximum value for the battery charge current. - View Dependent Claims (2, 3)
determining an amount of current for charging the battery based on the battery state of charge at the start of the charging and the battery state of charge at charge completion;
determining a battery temperature increase margin from said battery temperature at the start of the charging and said value of the upper limit of the battery temperature;
determining a value of an upper limit of the battery temperature increase per unit of charge amount from said amount of current for charging the battery and said battery temperature increase margin; and
determining said maximum value for the battery charge current based on said value of the upper limit of the battery temperature increase per unit of charge amount and an amount of a decrease in the battery temperature caused by a battery cooling device.
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Specification