Battery End Voltage Controller for Low Temperature Operation
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Solution Overview
Problem
Lithium-ion batteries experience increased impedance due to low temperature and high charge/discharge cycles, leading to voltage drops and reduced operational periods.
Innovation Solution
A battery apparatus with an end voltage controller that adjusts the discharge end voltage based on the battery's condition, including temperature and charge/discharge history, to extend the dischargeable period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery is used in a low temperature environment or for many charge/discharge cycles, then the impedance of the battery cell increases, but the voltage drop increases and the operable period becomes shorter
Solution Approach 1:
The end voltage is dynamically adjusted based on battery conditions (temperature and charge/discharge cycles) rather than being fixed. The microcomputer modifies the end voltage threshold according to detected temperature and cycle count, allowing the discharge termination point to adapt to changing battery characteristics and extend the operable period.
Solution Approach 2:
The patent changes the end voltage parameter based on temperature and charge/discharge cycle conditions. By modifying this critical parameter, the system compensates for increased impedance effects, thereby extending the usable discharge period while maintaining reliable operation under varying conditions.
2Power
If the impedance of the battery cell is increased due to temperature and cycle conditions, then the voltage drop is induced, but the dischargeable period becomes shorter
Solution Approach 1:
The end voltage parameter is changed based on impedance-affecting conditions (temperature and cycles). This parameter modification compensates for the voltage drop caused by increased impedance, effectively extending the dischargeable period without sacrificing power output reliability.
3Ease of operation
If the same end voltage is used regardless of battery conditions, then the control is simple, but the operable period becomes shorter when impedance increases
Solution Approach 1:
The control system transitions from static (fixed end voltage) to dynamic (adjustable end voltage based on conditions). The microcomputer automatically modifies the end voltage threshold according to temperature and cycle detection, extending the operable period while maintaining ease of operation through automated control.
Data Source
AI summary
A battery apparatus is provided, in which even if a battery thereof is used under the low temperature environment or the battery has been charged/discharged many times, by changing and setting the end voltage that ends the discharge from the battery cell on the basis of the property of the battery, the dischargeable period can be extended. A battery apparatus for controlling an operation by detecting a charge/discharge state of a battery cell, which is chargeable/dischargeable, to supply a power source voltage to an electronic apparatus, includes: end voltage setting means for setting an end voltage that ends the discharge from the battery cell on the basis of a discharge property of the battery cell; and an end a voltage controller for varying and controlling a setting of the end voltage in accordance with a condition of the battery cell being used.