Apparatus and method for preventing overcharge of secondary battery
AssigneeLG Chem, Ltd.
InventorsJung-Hyun NAM, Jeong-Wook KIM, Wong-Ki YOON, Suk-Hoon LEE
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Abstract
An apparatus and method for preventing overcharge of a secondary battery that prevents the overcharge of a Starting Lighting Ignition (SLI) battery, which can be applied to both a regulated system with a voltage regulator and an unregulated system without a voltage regulator, by regulating the voltage applied to the cell assembly.
Claims15
An apparatus for preventing overcharge of a cell assembly provided in a battery pack, the battery pack including at least one secondary battery, the apparatus comprising:
- a voltage measuring unit configured to measure a voltage across the cell assembly;
- a charging FET provided on a charge/discharge line electrically connecting one of a negative terminal of the cell assembly and a positive terminal of the cell assembly to one of a negative terminal of the battery pack and a positive terminal of the battery pack, the charging FET being configured to control the conduction of a charge current flowing in the charge/discharge line;
- a bypass resistor connected in parallel to the charging FET on a bypass line, the bypass line electrically connecting two terminals of the charging FET, and the bypass resistor being configured to cause the charge current to flow according to an opening/closing operation of the charging FET;
- and
- a processor configured to:
- receive the voltage across the cell assembly from the voltage measuring unit, and
- control the opening/closing operation of the charging FET based on the voltage across the cell assembly.
A method for preventing overcharge of a cell assembly provided in a battery pack, the battery pack including at least one secondary battery, the method comprising:
- measuring a voltage across the cell assembly;
- receiving the voltage across the cell assembly measured by the step of measuring voltage,
- controlling an opening/closing operation of a charging FET based on the voltage across the cell assembly,
- wherein the charging FET is provided on a charge/discharge line, the charge/discharge line electrically connecting one of a negative terminal of the cell assembly and a positive terminal of the cell assembly to one of a negative terminal of the battery pack and a positive terminal of the battery pack;
- controlling, by the charging FET, the conduction of a charge current flowing in the charge/discharge line;
- and
- controlling the opening/closing operation of the charging FET to cause the charge current to flow through a bypass resistor connected in parallel to the charging FET on a bypass line, the bypass line electrically connecting two terminals of the charging FET.
Dependencies are inferred from the claim text.