Electric storage device and method for charging same
First Claim
1. An electric storage device comprising:
- SOC calculation section for calculating, in the case where a battery voltage of a lithium ion storage battery during charge has reached a predetermined value, a charge rate of a lithium ion storage battery when the battery voltage has reached the predetermined value;
voltage difference calculation section for calculating, based on no-load characteristics of the lithium ion storage battery, a battery voltage difference corresponding to a difference between the charge rate calculated by the SOC calculation section and a preset charge rate during lithium deposition;
charge complete voltage calculation section for calculating a charge complete voltage that is a criterion for determining whether or not to complete the charge, by adding the battery voltage difference calculated by the voltage difference calculation section to the battery voltage when the battery voltage has reached the predetermined value; and
charge control section for completing the charge of the lithium ion storage battery when the battery voltage of the lithium ion storage battery has reached the charge complete voltage;
wherein the charge complete voltage calculation section resets a maximum allowable voltage as a new charge complete voltage when the charge complete voltage calculated based on the battery voltage difference calculated by the voltage difference calculation section is higher than the maximum allowable voltage preset according to specifications of the lithium ion storage battery, and the charge control section completes the charge of the lithium ion storage battery when the battery voltage of the lithium ion storage battery has reached the reset new charge complete voltage.
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Accused Products
Abstract
Provided are: an electric storage device having improved reliability in charging a storage battery; and a charging method. This electric storage device is provided with: an SOC calculation section which calculates a charge rate when a battery voltage reached a predetermined value, in the cases where the battery voltage reached the predetermined value when a lithium ion storage battery is being charged; a voltage difference calculation section, which calculates a battery voltage difference corresponding to a difference between the charge rate and a charge rate at which lithium is deposited; a charge complete voltage calculation means, which calculates a charge complete voltage by adding the voltage difference to the battery voltage obtained when the battery voltage reached the predetermined value; and a charge control means, which completes the charging of the lithium ion storage battery in the cases where the battery voltage reached the charge complete voltage.
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Citations
5 Claims
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1. An electric storage device comprising:
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SOC calculation section for calculating, in the case where a battery voltage of a lithium ion storage battery during charge has reached a predetermined value, a charge rate of a lithium ion storage battery when the battery voltage has reached the predetermined value; voltage difference calculation section for calculating, based on no-load characteristics of the lithium ion storage battery, a battery voltage difference corresponding to a difference between the charge rate calculated by the SOC calculation section and a preset charge rate during lithium deposition; charge complete voltage calculation section for calculating a charge complete voltage that is a criterion for determining whether or not to complete the charge, by adding the battery voltage difference calculated by the voltage difference calculation section to the battery voltage when the battery voltage has reached the predetermined value; and charge control section for completing the charge of the lithium ion storage battery when the battery voltage of the lithium ion storage battery has reached the charge complete voltage; wherein the charge complete voltage calculation section resets a maximum allowable voltage as a new charge complete voltage when the charge complete voltage calculated based on the battery voltage difference calculated by the voltage difference calculation section is higher than the maximum allowable voltage preset according to specifications of the lithium ion storage battery, and the charge control section completes the charge of the lithium ion storage battery when the battery voltage of the lithium ion storage battery has reached the reset new charge complete voltage. - View Dependent Claims (2, 3, 4)
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5. A charging method comprising:
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charge rate calculation processing by an SOC calculation section of calculating, in the case where a battery voltage of a lithium ion storage battery during charge has reached a predetermined value, a charge rate of the lithium ion storage battery when the battery voltage has reached the predetermined value; voltage difference calculation processing of calculating, based on no-load characteristics of the lithium ion storage battery, a battery voltage difference corresponding to a difference between the charge rate calculated by the SOC calculation section and a preset charge rate during lithium deposition; charge complete voltage calculation processing of calculating a charge complete voltage that is a criterion for determining whether or not to complete the charge, by adding the battery voltage difference to the battery voltage when the battery voltage has reached the predetermined value; and charge control processing of completing the charge of the lithium ion storage battery when the battery voltage of the lithium ion storage battery has reached the charge complete voltage; wherein the charge complete voltage calculation processing resets a maximum allowable voltage as a new charge complete voltage when the charge complete voltage calculated based on the battery voltage difference calculated by the voltage difference calculation processing is higher than the maximum allowable voltage preset according to specifications of the lithium ion storage battery, and the charge control processing completes the charge of the lithium ion storage battery when the battery voltage of the lithium ion storage battery has reached the reset new charge complete voltage.
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Specification