BATTERY MANAGING DEVICE AND THE METHOD OF USING THE SAME

• US 20100259226A1
• Filed: 01/15/2010
• Published: 10/14/2010
• Est. Priority Date: 01/16/2009
• Status: Abandoned Application

• Current Assignee: BYD Company Limited, Shanghai BYD Electric Vehicle Company Limited (BYD Company Limited)
• Original Assignee: BYD Company Limited
• Inventors: Deng, Linwang, Wu, Xuejian, Zhang, Jianhua
• Application Number:
  US12/688,317
• Publication Number:
  US 20100259226A1
• Time in Patent Office: Days
• US Class Current: 320/150
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: H02J 7/007194 of the battery
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

A battery managing device includes a charger operatively coupled to a battery, and a single chip configured to determine a charging voltage and a charging current of the battery, which correlate to a residual capacitance of the battery. The single chip is configured to control the charger to charge the battery in accordance with the determined charging voltage and charging current. A method of managing battery charging using a single chip and a charger coupled to a battery includes (1) using a single chip to determine a charging voltage and a charging current of the battery, which correlate to a residual capacitance of the battery, and (2) controlling the charger to charge the battery in accordance with the determined charging voltage and charging current.

Claims

1. A battery managing device, comprising:

a charger operatively coupled to a battery;

a single chip configured to determine a charging voltage and a charging current of the battery, which correlate to a residual capacitance of the battery; and

the single chip configured to control the charger to charge the battery in accordance with the determined charging voltage and charging current.

2. The battery managing device according to claim 1 further comprising:

a capacitance detecting module configured to detect a residual capacitance of the battery;

an A/D converting module; and

wherein the capacitance detecting module is operatively coupled to the A/D converting module and the A/D converting module is operatively coupled to the single chip.

3. The battery managing device according to claim 1 further comprising:

a current detecting module;

a memorizing module;

an A/D converting module; and

wherein the current detecting module is operatively coupled to the A/D converting module, the A/D converting module is operatively coupled to the single chip, and the memorizing module is operatively coupled to the single chip.

4. A method of managing battery charging using a single chip and a charger coupled to a battery, comprising:

(1) using a single chip to determine a charging voltage and a charging current of the battery, which correlate to a residual capacitance of the battery; and

(2) controlling the charger to charge the battery in accordance with the determined charging voltage and charging current.

5. The method according to claim 4, further comprising:

providing a capacitance detecting module;

providing an A/D converting module;

operatively coupling the capacitance detecting module and the A/D converting module; and

operatively coupling the A/D converting module and the single chip, wherein the residual capacitance of the battery in step (1) is detected by the capacitance detecting module.

6. The method according to claim 4, further comprising

providing a current detecting module;

providing a memorizing module;

providing an A/D converting module;

operatively coupling the current detecting module to the A/D converting module;

operatively coupling the A/D converting module to the single chip; and

operatively coupling the memorizing module to the single chip.

7. The method according to claim 6, wherein the step (1) further comprises:

(1-1) obtaining an original residual capacitance of the battery from the memorizing module, and determining an original charging voltage and an original charging current, which correlates to the original residual capacitance;

(1-2) determining present charging voltage and a present charging current, which correlate to the present residual capacitance of the battery.

8. The method according to claim 7, wherein determining the original residual capacitance in step (1-1) further comprises:

(1-1-1) obtaining an amount of the capacitance which has been drained from the battery, which is equal to an integral value of the discharging voltage and the discharging current calculated by the single chip;

(1-1-2) subtracting the amount of the capacitance which has been drained from the battery from a total capacitance of the battery to obtain the original residual capacitance;

(1-1-3) storing the original residual capacitance in the memorizer module; and

(1-1-4) obtaining the original residual capacitance from the memorizer module when the battery is charged.

9. The method according to claim 7, wherein the present residual capacitance in step (1-2) further comprises:

(1-2-1) obtaining the amount of the capacitance which has been stored in the battery when the battery is charged;

(1-2-2) obtaining the present residual capacitance by adding the original residual capacitance and the amount of the capacitance which has been stored in the battery when the battery is charged; and

wherein

an amount of charge stored in the battery is equal to the integral value of the charging voltage and the charging current.

10. The method according to claim 9, further comprising:

(3) determining whether the battery is fully charged;

(3-1) controlling the charger to stop charging the battery when the battery is fully charged; and

(3-2) controlling the charger to continue charging the battery when the battery is not fully charged.

11. The method according to claim 10, further comprising:

providing a voltage detecting module;

operatively coupling the voltage detecting module to the A/D converting module; and

determining whether the voltage of a battery monomer reaches the rated voltage.

12. The method according to claim 11, further comprising:

providing a temperature detecting module;

operatively coupling the temperature detecting module to the A/D converting module;

wherein the step (1) and step (2) further include;

(s-1) dividing series-wound battery monomers into a plurality of battery groups and detecting the temperature of each battery monomer and battery group;

(s-2) determining whether the temperature of one of the battery monomers and battery groups reaches the predetermined safe temperature;

(s-3) terminating charging the battery if the temperature of one of the battery monomers and battery groups reaches the predetermined safe temperature; and

(s-4) continuing to charge the battery if the temperature of any battery monomer and any battery group does not reach the predetermined safe temperature.