Dynamic Battery Cell Voltage Balancing Circuit
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Solution Overview
Problem
Conventional battery balancing circuits face challenges in efficiently balancing cell voltage values of series-connected cells, as they generate a constant current regardless of cell voltage magnitude, leading to inefficient voltage balancing.
Innovation Solution
A battery control circuit that includes connection terminals for positive electrodes, a ground terminal for the lowest cell, a control circuit to select terminals, and a current generation circuit that supplies varying terminal currents based on cell voltage values, allowing for dynamic balancing of cell voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a constant current is generated by the current generator, then the current flows to the terminal connected to the positive electrode of the cell, but it is difficult to efficiently balance the cell voltage values of each of the plurality of cells
Solution Approach 1:
The patent applies dynamics by making the current value adaptive rather than constant. The current generation circuit dynamically adjusts the current value flowing to each cell terminal based on the cell voltage magnitude detected by the control circuit. This allows the balancing system to adapt to different cell voltage conditions, improving balancing efficiency by directing higher currents to cells with higher voltages and lower currents to cells with lower voltages.
Solution Approach 2:
The patent changes the parameter of current value from a fixed constant to a variable parameter that depends on cell voltage magnitude. The control circuit detects the voltage of each cell and adjusts the current value accordingly, transforming the electrical parameter to achieve optimal balancing performance across cells with different voltage levels.
2Device complexity
If a constant current flows regardless of cell voltage value, then the circuit structure is simple, but the voltage balancing time is extended
Solution Approach 1:
The patent introduces dynamic current adjustment based on cell voltage detection, which accelerates the voltage convergence process. By making the current value responsive to cell voltage conditions, the system reduces the time required to balance cell voltages without requiring a fundamentally more complex circuit architecture.
Solution Approach 2:
The control circuit implements feedback by detecting the voltage of each cell and using this information to adjust the current value supplied to each cell terminal. This feedback mechanism enables the system to automatically optimize the balancing process, reducing convergence time while maintaining a relatively simple overall circuit structure.
Data Source
AI summary
A battery control circuit controls a balance of cell voltage values of cells coupled in series, and includes connection terminals respectively coupling to a positive electrode of a corresponding cell, a ground terminal coupled to an internal ground of the battery control circuit and coupling to a negative electrode of a cell located at a lowest stage of the cells, a control circuit to select, from the connection terminals, at least one connection terminal coupled to the internal ground via an internal current path of the battery control circuit, and a current generation circuit to supply a terminal current whose current value varies according to the cell voltage value of the cell whose positive electrode is coupled to the at least one of the connection terminals selected by the control circuit, from the at least one of the connection terminals to the internal ground via the internal current path.