Control signal generation circuit and battery management system using the same

• US 7,830,122 B2
• Filed: 08/14/2009
• Issued: 11/09/2010
• Est. Priority Date: 09/08/2005
• Status: Expired due to Fees

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Seo, Se-Wook, Lim, Gye-Jong, Yun, Han-Seok
• Primary Examiner(s): Tso; Edward
• Assistant Examiner(s): BOATENG, ALEXIS ASIEDUA
• Application Number:
  US12/541,344
• Publication Number:
  US 20100001694A1
• Time in Patent Office: 452 Days
• Field of Search: 320/134, 320/104, 320/128, 320/107, 320/136, 320/137, 320/125, 320/138, 320/116, 320/119, 320/118, 320/155, 320/132, 320/121, 307/10.7, 307/149, 307/150, 702/63, 324/426, 324/433
• US Class Current: 320/134
• CPC Class Codes: H02J 7/0019 using switched or multiplexed charge circuits
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A control signal generating circuit used in a battery management system may stably generate a control signal. The control signal generating circuit includes a first signal line transmitting a first control signal having an on-level or an off-level, a second signal line transmitting a second control signal having an on-level or an off-level, and a third signal line transmitting a third control signal having an on-level or an off-level. In addition, the control signal generating circuit includes a transistor including a first electrode coupled to the first signal line and a second electrode applied with the off-level. The transistor electrically connects the first and second electrodes and converts the first control signal into a fourth control signal by being turned on based on the second and third control signals. Finally, the control signal generating circuit includes a circuit unit generating a fifth control signal having the on-level when the second and third control signals are input and have the off-level.

Claims

1. A battery management system coupled to a battery formed with a pack having a plurality of battery cells including first and second battery cells, the battery management system comprising:

a control signal generator outputting a first control signal, and second, third, and fourth control signals having a first level at different timing from the first control signal;

first and second relays respectively transmitting cell voltages of the first and second battery cells by being turned on in response to the first level of the first and second control signals;

a third relay transmitting the cell voltage transmitted through one of the first and second relays in response to the third control signal with the first level;

a charging unit storing the cell voltage transmitted from the third relay;

a fourth relay transmitting the stored cell voltage of the charging unit in response to the first level of the fourth control signal; and

an A/D converter converting the cell voltage transmitted through the fourth relay into digital data,

wherein the control signal generator makes the first and second control signals to be a second level excluding the first level when the fourth control signal is the first level and makes the third control signal to be the second level.

2. The battery management system of claim 1, wherein the control signal generator comprises:

a common electrode having a potential of the second level;

a first transistor including a first electrode applied with the first control signal, a second electrode coupled to the common electrode, and a first control electrode applied with the fourth control signal, and electrically connecting the first and second electrodes by being turned on when the fourth control signal is the first level; and

a second transistor including a third electrode applied with the second control signal, a fourth electrode coupled to the common electrode, and a second control electrode applied with the fourth control signal, and electrically connecting the third and fourth electrodes by being turned on when the fourth control signal is the first level.

3. The battery management system of claim 2, wherein the first control signal is input through a predetermined resistor to the first electrode and the second control signal is input through a predetermined resistor to the second electrode.

4. The battery management system of claim 2, wherein the fourth control signal is input through a predetermined resistor to the first electrode and the fourth control signal is input through a predetermined resistor to the second electrode.

5. A battery management system including a plurality of battery cells, the system comprising:

a main control unit controlling the operation of the battery cells;

a control signal generator connected to the main control unit and transmitting a plurality of control signals;

a cell voltage measurer measuring analog voltages of the battery cells based on the control signals transmitted from the control signal generator and outputting analog voltage values of the battery cells; and

an analog/digital converter converting the analog voltage values received from the cell voltage measurer into digital data and outputting the digital data to the main control unit,

wherein the main control unit prevents a simultaneous transmission of stored cell voltages of the battery cells to the analog/digital converter based on the digital data received from the analog/digital converter.