System and method for rapidly charging battery while considering thermal stability

• US 10,135,277 B2
• Filed: 11/20/2015
• Issued: 11/20/2018
• Est. Priority Date: 11/16/2015
• Status: Expired due to Fees

• Current Assignee: Kwon Heo
• Original Assignee: TwoMI Co., Ltd.
• Inventors: Heo, Kwon
• Primary Examiner(s): Fantu, Yalkew
• Application Number:
  US15/316,276
• Publication Number:
  US 20170271887A1
• Time in Patent Office: 1,096 Days
• Field of Search: 320153
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• CPC Class Codes: G01R 31/374 with means for correcting the measurement for temperature or ageing
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H02J 7/007194 of the battery
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

The present invention relates to a rapid charging system and a rapid charging method that consider thermal stability, and according to the present invention, a battery may be rapidly charged by determining a charging current based on the environment of the battery and the state of the battery, and the life span of the battery may be prevented from being shortened, the charging efficiency becomes higher, and the charging time may be reduced by preventing degradation of the battery due to the charging efficiency and the reaction heat of the battery.

Claims

1. A method of rapidly charging a battery, the method comprising:

detecting a temperature, by a temperature detection unit;

detecting a voltage of a secondary battery, by a voltage detection unit;

determining whether the voltage of the secondary battery detected through the battery detection unit is lower than a first voltage, by a control unit;

if the voltage of the secondary battery is lower than the first voltage, rapidly primarily charging the secondary battery by applying a temperature compensation factor to a first constant current, by the control unit;

if the voltage of the secondary battery is not lower than the first voltage, determining whether the voltage of the secondary battery is lower than a second voltage that is higher than the first voltage, by the control unit;

if the voltage of the secondary battery is lower than the second voltage, charging the secondary battery by applying the temperature compensation factor to a second constant current, by the control unit;

if the voltage of the secondary battery is not lower than the second voltage, determining whether the voltage of the secondary battery is lower than a third voltage, by the control unit;

if the voltage of the secondary battery is lower than the third voltage, charging the secondary battery by applying the temperature compensation factor to a third constant current, by the control unit; and

if the voltage of the secondary voltage is not lower than the third voltage, terminating the charging operation.

2. The method of claim 1, wherein the first voltage is 4.1 V, the second voltage is 4.15 V, the third voltage is 4.2 V, and the first constant current is 6 to 7 A, the second constant current is 4 to 5 A, and the third content current is 1 to 2 A.

3. The method of claim 1, wherein when the temperature is below zero or 60°

C. or higher, the temperature compensation factor decreases the first to third constant currents by multiplying the first to third constant currents by the temperature compensation factor.

4. A system for rapidly charging a battery, the system comprising:

a temperature detection unit for detecting a temperature;

a power supply unit that supplies electric power for charging a secondary battery;

a charging unit that is connected to the power supply unit to charge the secondary battery;

a voltage detection unit that detects voltage information of the secondary battery and outputs the detected voltage information;

a control unit that determines a charging current based on the temperature detected by the temperature detection unit and the voltage information detected by the voltage detection unit to control the charging unit such that the control unit charges the secondary battery; and

a memory that stores a compensation factor for compensating for a charging current in response to a temperature,

wherein the control unit;

compares the voltage information provided by the voltage detection unit with preset values, and charges the secondary battery by applying the compensation factor to a charging current determined based on the comparison result;

if the voltage of the secondary battery is lower than a first voltage, charges the secondary battery with a first constant current;

if the voltage of the secondary battery is not lower than the first voltage and lower than a second voltage, charges the secondary battery with a second constant current;

if the voltage of the secondary battery is not lower than the second voltage and lower than a third voltage, charges the secondary battery with a third constant current;

if the voltage of the secondary battery is not lower than the third voltage, terminates the charging operation of the secondary battery; and

applies the compensation factor to the first to third constant currents.

5. The system of claim 4, wherein the first voltage is 4.1 V, the second voltage is 4.15 V, the third voltage is 4.2 V, and

wherein the first constant current is 6 to 7 A, the second constant current is 4 to 5 A, and the third content current is 1 to 2 A.

6. A system for rapidly charging a battery, the system comprising:

a temperature detection unit for detecting a temperature;

a power supply unit that supplies electric power for charging a secondary battery;

a charging unit that is connected to the power supply unit to charge the secondary battery;

a voltage detection unit that detects voltage information of the secondary battery and outputs the detected voltage information; and

a control unit that determines a charging current based on the temperature detected by the temperature detection unit and the voltage information detected by the voltage detection unit to control the charging unit such that the control unit charges the secondary battery,

wherein the control unit;

if the voltage of the secondary battery is lower than a first voltage, charges the secondary battery with a first constant current;

if the voltage of the secondary battery is not lower than the first voltage and lower than a second voltage, charges the secondary battery with a second constant current;

if the voltage of the secondary battery is not lower than the second voltage and lower than a third voltage, charges the secondary battery with a third constant current;

if the voltage of the secondary battery is not lower than the third voltage, terminates the charging operation of the secondary battery; and

applies a temperature compensation factor to the first to third constant currents.