Battery Array Charging Voltage Control
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Solution Overview
Problem
Existing methods for charging a battery array with multiple series-connected lithium-ion batteries face challenges in achieving full capacity while preventing voltage imbalances, as they either require complex circuitry for independent charging or suspend charging when a battery's voltage exceeds the maximum specified voltage, leading to insufficient charging of other batteries.
Innovation Solution
A method that monitors the voltage of each battery cell at a prescribed sampling rate and reduces the charging power by adjusting the voltage or current when any battery exceeds the maximum specified voltage, allowing continuous charging while maintaining all batteries below the maximum voltage threshold, thereby ensuring the battery array is fully charged efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging is suspended when any battery voltage exceeds maximum specified voltage, then battery voltage control is improved, but charge capacity is reduced
Solution Approach 1:
The charging current is dynamically adjusted based on real-time voltage monitoring. When any battery cell voltage exceeds the maximum specified voltage, the charging current is reduced to a lower level rather than completely suspending charging, allowing the system to adapt to voltage changes and continue charging other batteries that have not reached maximum voltage.
Solution Approach 2:
The charging parameters (current level) are changed based on voltage conditions. The system transitions between different charging current levels: a first charging current when all batteries are below maximum voltage, and a second reduced charging current when any battery exceeds maximum voltage, optimizing both voltage control and charge capacity.
2Productivity
If independent charging circuits are used for each battery, then charge capacity is improved, but device complexity increases
Solution Approach 1:
A single charging circuit serves multiple battery cells simultaneously through series connection. The charging circuit applies charging current to all batteries in sequence, and the control unit monitors voltages of all cells and adjusts the charging parameters accordingly, eliminating the need for separate independent charging circuits for each battery.
Solution Approach 2:
Multiple battery cells are merged into a series-connected battery array that shares a common charging circuit. The individual battery voltages are monitored and controlled through a unified control system that adjusts the charging current based on the state of any individual cell, combining monitoring and control functions into a single integrated system.
Data Source
AI summary
The method of charging a battery array performs constant current, constant voltage charging of a battery array while detecting the voltage of each battery. The battery array is a plurality of series connected batteries. The charge method detects the voltage of each battery cell at a prescribed sampling rate. When the voltage of any battery cell exceeds a preset maximum specified voltage, charging power is reduced for constant current, constant voltage charging of the battery array.