Secondary battery system, charging method, and vehicle for charging with three different currents
AssigneeKabushiki Kaisha Toshiba
InventorsNobukatsu Sugiyama, Ena Ishii, Tomokazu Morita, Yumi Fujita
Life of this patent
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Abstract
A secondary battery system includes a secondary battery and a controller. The secondary battery has a charging state including at least first to third sections. The controller controls a current flowing through the secondary battery so as to be smaller than a predetermined current in the first and third sections, and controls the current flowing through the secondary battery so as to be larger than the predetermined current in the second section.
Claims9
A secondary battery system comprising:
- a secondary battery having a continuous charging state including at least first to third sections, wherein the first section is followed by the second section, and the second section is followed by the third section;
- a measurement part that measures a volume change rate of the secondary battery;
- and
- a controller that controls a current flowing through the secondary battery based on the volume change rate of the secondary battery, wherein the controller controls the current flowing through the secondary battery so as to be smaller than a predetermined current in the first and third sections, and controls the current flowing through the secondary battery so as to be larger than the predetermined current in the second section,
- wherein the first section has a first volume change rate, the second section has a second volume change rate, and the third section has a third volume change rate, each one of the first to third volume change rates represents a relationship between a volume of the secondary battery and a charge amount of the secondary battery in a case where the predetermined current flows through the secondary battery, and
- the second volume change rate is different from the first volume change rate and the third volume change rate.
A charging method in a secondary battery having a continuous charging state including at least first to third sections, the first section being followed by the second section, and the second section being followed by the third section,
- the charging method comprising:
- measuring a volume change rate of the secondary battery;
- and
- controlling a current flowing through the secondary battery based on the volume change rate of the secondary battery, wherein the controlling the current comprising:
- controlling a current flowing through the secondary battery so as to be smaller than a predetermined current in the first and third sections;
- and
- controlling the current flowing through the secondary battery so as to be larger than the predetermined current in the second section,
- wherein the first section has a first volume change rate, the second section has a second volume change rate, and the third section has a third volume change rate, each one of the first to third volume change rates represents a relationship between a volume of the secondary battery and a charge amount of the secondary battery in a case where the predetermined current flows through the secondary battery, and
- the second volume change rate is different from the first volume change rate and the third volume change rate.
Dependencies are inferred from the claim text.