US 2009/0153104 A1Published application

Charging method

AssigneeSanyo Electric Co., Ltd.

InventorsShinichi Matsuura, Atsushi Kawasumi

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Abstract

A charging method includes first and second charging steps to charge a lithium-ion battery. In the first charging step, a temperature rise gradient of the battery to a current is detected. A battery temperature when the battery is charged to a first predetermined capacity is predicted based on the gradient. A charging current is controlled based on the predicted temperature. The battery is charged, at a current that brings a battery temperature lower than a predetermined temperature, to the first predetermined capacity. In the second charging step, a temperature rise gradient of the battery is detected. A battery temperature when the battery is charged to a second predetermined capacity is predicted based on the gradient. A charging current is controlled based on the predicted temperature. The battery is charged, at a current that brings the temperature of the battery lower than the predetermined temperature, to the second predetermined capacity.

Claims13

Dependent claims

A constant-voltage and constant-current lithium-ion rechargeable battery charging method comprising:

a first charging step that detects, at a current that is currently applied to a battery to be charged, a temperature rise gradient of the battery, predicts a battery temperature when the battery will be charged to a first predetermined capacity based on the detected temperature rise gradient, controls a charging current based on the predicted temperature, and charges the battery at a current that brings a temperature of the battery lower than a predetermined temperature to the first predetermined capacity;
and
a second charging step that, after the battery is charged to the first predetermined capacity, detects, at a current that is currently applied to the battery to be charged, a temperature rise gradient of the battery, predicts a battery temperature when the battery will be charged to a second predetermined capacity based on the temperature rise gradient, controls a charging current based on the predicted temperature, and charges the battery at a current that brings a temperature of the battery lower than the predetermined temperature to the second predetermined capacity.

Dependencies are inferred from the claim text.