Secondary Battery Power Supply Management for Energy Balance
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Solution Overview
Problem
Secondary battery devices with multiple cells face challenges in efficiently balancing energy storage due to variations in charge, discharge, and temperature, leading to uneven energy distribution, which affects discharge efficiency and can result in overdischarge if cell balance control is prolonged, also increasing power consumption when monitoring and controlling cell voltage.
Innovation Solution
A secondary battery device with a power source supply management unit that includes a timer to periodically turn on and off the power source voltage, using an OR circuit to manage signals from a timer, ignition, and external charger, allowing controlled cell balance operations while minimizing power consumption by varying the timing of power supply based on cell balance control periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If cell balance control is continued to equalize energy in secondary battery cells, then energy balance is improved, but power consumption increases and overdischarge risk increases
Solution Approach 1:
The control device operates in periodic cycles, alternating between cell balance control mode and power saving mode. During cell balance control, the control device monitors voltages and activates equalization circuits. During power saving mode, monitoring is suspended and power consumption is reduced. This periodic operation allows the system to achieve energy balance while managing power consumption constraints.
Solution Approach 2:
The system dynamically switches between different operational states based on real-time conditions. The control device adjusts its behavior by transitioning between active monitoring and power saving modes, and by dynamically controlling the equalization process to prevent overdischarge while maintaining energy balance.
2Reliability
If cell balance control is prolonged to prevent overdischarge, then reliability is improved, but power consumption increases
Solution Approach 1:
The control device continuously monitors the voltage of each secondary battery cell and uses this feedback to control the equalization process. When a cell approaches overdischarge conditions, the system receives feedback and automatically adjusts or stops the equalization current to that cell, preventing overdischarge while minimizing unnecessary power consumption.
Solution Approach 2:
The system applies equalization current selectively and partially to only those cells that require balancing, rather than continuously to all cells. The control device determines which cells need equalization based on voltage comparisons and applies current only during necessary periods, reducing overall power consumption while maintaining reliability.
3Measurement precision
If control device constantly monitors voltages of all secondary battery cells, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The voltage monitoring function operates periodically rather than continuously. The control device monitors voltages during cell balance control periods to maintain measurement precision when needed, then suspends monitoring during power saving periods to reduce power consumption. This periodic monitoring approach balances measurement requirements with power constraints.
Data Source
AI summary
According to one embodiment, the power supply management portion includes a timer configured to output an ON signal every time set by the control circuit, an OR circuit configured to receive supply of an output signal from the timer, an external signal supplied from outside, and a switch control signal output from the control circuit, and a switch circuit configured to switch output of the power source voltage from an external power source according to an output signal from the OR circuit, and the control circuit turns on a switch control signal after confirming which of the output signal from the timer or the external signal has turned on the switch circuit and turns off the switch control signal when both of the output signal from the timer and the signal supplied from outside are turned off.