Method for precise estimated secondary battery significant fully discharge capacity
A secondary battery, fully discharged technology, applied in secondary batteries, secondary battery repair/maintenance, battery circuit devices, etc., can solve problems such as hindering accurate monitoring of charging and discharging states of secondary batteries, and inconvenient use.
Inactive Publication Date: 2007-08-29
SAMSUNG SDI CO LTD
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- Application Information
AI Technical Summary
Problems solved by technology
The inaccurate estimation of the continuous effective full discharge capacity hinders the accurate monitoring of the state of charge and discharge of the secondary battery, causing inconvenience in use
Method used
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Embodiment Construction
[0017] Referring to Fig. 1. a secondary battery assembly to which the present invention is applicable includes a secondary battery 11, several field effect transistors (FETs) 12, a protection circuit 13, a resistor 14, a protection device 15, a microcomputer 16. An Electrically Erasable Programmable Read Only Memory (EEPROM) 17 and a thermistor 18.
[0018] The FET 12 is turned on and off by a signal from the protection circuit 13 , controlling charging and discharging of the secondary battery 11 . The protection circuit 13 measures the instantaneous voltage of the secondary battery 11 and measures the instantaneous current of the secondary battery 11 by measuring the current flowing through the resistor 14 . The measured instantaneous current and voltage are transmitted to the microcomputer 16 as digital data. The protection circuit 13 turns on and off the FET 12 according to a control signal received from the microcomputer 16 . The protection device 15 prevents overchargin...
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The invention provides a method of precisely estimating the effective full-discharge capacity of a secondary battery. That effective full-discharge capacity degrades as the secondary battery is repeatedly charged and discharged. The method includes sequentially fully charging a reference secondary battery and fully discharging the reference secondary battery until the reference secondary battery is dead, n times, and simultaneously measuring (i) a constant-voltage period in which the voltage of the reference secondary battery is essentially constant each time the reference secondary battery is fully charged and (ii) full discharge capacity of the reference secondary battery each time the reference secondary battery is fully charged, and storing the constant-voltage periods and corresponding full-discharge capacities measured; and measuring the constant-voltage period each time a secondary battery, essentially identical to the reference secondary battery, is charged, searching the constant-voltage periods stored for the reference secondary battery for the full-discharge capacity corresponding to the constant-voltage period measured for the secondary battery, and setting, for the secondary battery, as an effective full-discharge capacity, the full-discharge capacity of the reference secondary battery stored and corresponding to the constant-voltage period of the secondary battery that has been measured.
Description
technical field [0001] The present invention relates to a method of accurately estimating the effective full discharge capacity of a secondary battery, which decreases in proportion to the degradation of the secondary battery. Background technique [0002] Secondary batteries are widely used in portable electronic devices, such as laptop computers, mobile phones, and video cameras. The state of charge of such a secondary battery can be accurately monitored by determining the relative charge rate, which decreases in proportion to the degradation of the secondary battery. Accurate data must be used for monitoring and controlling the state of charge and state of discharge of the battery. Conventionally, these data are generated by periodically estimating and updating the effective discharge capacity of the secondary battery. [0003] In a conventional method of accurately estimating the effective full discharge capacity of a secondary battery, only the number of charges and d...
Claims
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IPC IPC(8): G01R31/36H01M10/42G01N27/22H01M10/48H02J7/00
CPCG01R31/36G01N27/22
Inventor 刘壮铉
Owner SAMSUNG SDI CO LTD