Battery Management System (BMS) and driving method thereof

• US 20080091364A1
• Filed: 08/01/2007
• Published: 04/17/2008
• Est. Priority Date: 10/16/2006
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Choi, Soo-Seok, Park, Ho-Young, Lee, Young-Jo, Kim, Beom-Gyu, Seo, Se-Wook, Lim, Gye-Jong, Yun, Han-Seok, Tae, Yong-Jun
• Granted Patent: US 7,680,613 B2
• Time in Patent Office: Days
• US Class Current: 702/63
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A Battery Management System (BMS) includes a sensing unit and a Micro Control Unit (MCU). The sensing unit measures a battery current, a battery voltage, and a battery temperature. The MCU determines a State of Charge (SOC) reset point based on the measured battery current and voltage. The BMS determines a battery overcharge state using a current integration result after the SOC reset point is reached. The MCU includes an SOC calculator and a full charge determining unit. The SOC calculator transmits a present current integration value upon detecting the SOC reset point. The full charge determining unit receives the present current integration value, integrates the current using the measured battery current, and determines that the battery is being overcharged when the current integration value reaches a predetermined battery rating

Claims

1. A Battery Management System (BMS) comprising:

a sensing unit to measure a battery current, a battery voltage, and a battery temperature; and

a Micro Control Unit (MCU) to determine a State of Charge (SOC) reset point based on the measured battery current and voltage;

wherein the BMS determines a battery overcharge state based on a current integration result after the SOC reset point.

2. The BMS of claim 1, wherein the SOC reset point corresponds to the battery current and the battery voltage.

3. The BMS of claim 1, wherein the MCU comprises:

an SOC calculator to transmit a present current integration value in response to detecting the SOC reset point; and

a full charge determining unit to receive the present current integration value, to integrate the current using the measured battery current, and to determine that the battery is being overcharged in response to a current integration value reaching a predetermined battery capacity rating.

4. The BMS of claim 3, further comprising a protection circuit to turn off a main switch to disconnect the battery from a power source in response to a determination that the battery is being overcharged.

5. A method of driving a Battery Management System (BMS), the method comprising:

detecting a State of Charge (SOC) reset point;

integrating a measured battery current until a current integration value corresponding to the SOC reset point reaches a battery capacity rating in response to an SOC reset condition reaching the SOC reset point and a reset operation is required;

comparing a current integration result and the battery capacity rating; and

determining that a battery is being overcharged in response to the current integration result being equal to the battery capacity rating.

6. The method of claim 5, further comprising stopping charging of the battery in response to a determination that the battery is being overcharged.