Balance Correction Circuit Control for Voltage Equalization
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Solution Overview
Problem
Existing balance correcting circuits for electricity storage systems may take longer to equalize voltages when moving electric charges from low-voltage to high-voltage cells, potentially causing uneven voltage distribution and reduced system efficiency due to differences in internal resistance between cells.
Innovation Solution
A balance correcting apparatus and system that includes a motor, braking signal generator, state transition signal generator, and switching devices to control the balance correcting circuit's operation, specifically stopping the circuit from moving charges from low-voltage to high-voltage cells by limiting power supply when a state transition signal is received, thereby preventing voltage drop and promoting equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the balance correcting circuit operates continuously to equalize voltages, then voltage equalization is achieved, but the equalization time increases when moving charges from low-voltage to high-voltage cells
Solution Approach 1:
The control device predicts rapid voltage changes based on accelerator/decelerator operations and preemptively adjusts or stops the balance correcting circuit before voltage imbalance occurs. This prevents the need for lengthy equalization operations by counteracting potential voltage differences before they fully develop.
Solution Approach 2:
The balance correcting circuit operates dynamically based on real-time driving conditions. The control device adjusts the circuit's operation state (on/off) according to accelerator/decelerator signals and predicted voltage changes, making the system adaptive rather than static, thereby optimizing equalization speed under varying conditions.
2Reliability
If the balance correcting circuit moves charges from low-voltage to high-voltage cells, then voltage equalization is attempted, but the equalization process becomes slower and less efficient
Solution Approach 1:
Instead of always moving charges from high-voltage to low-voltage cells (conventional approach), the control device intelligently determines the charge flow direction based on predicted voltage changes. When rapid discharge is predicted, it may temporarily allow or facilitate charge movement that optimizes equalization speed, even if it appears counterintuitive, thereby improving overall equalization efficiency.
Solution Approach 2:
The control device changes operational parameters (charge flow direction, circuit on/off state) based on real-time conditions including accelerator/decelerator operations and voltage differential predictions. This dynamic parameter adjustment optimizes the equalization process speed and efficiency under different operating scenarios.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents voltage imbalance by stopping the balance correcting circuit from moving charges from low-voltage to high-voltage cells, thereby maintaining efficient voltage equalization and extending the lifespan of electricity storage cells.
Implementation Method 1
an inductor having one end that is electrically connected to a connection point between one end of the first electricity storage cell and one end of the second electricity storage cell
Implementation Method 2
a first switching device that is electrically connected between the other end of the inductor and the other end of the first electricity storage cell, a second switching device that is electrically connected between the other end of the inductor and the other end of the second electricity storage cell
Data Source
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AI summary
A balance correcting circuit is prevented from moving charges from a low-voltage electricity storage cell to a high-voltage electricity storage cell in a electricity storage system. The balance correcting circuit includes an inductor, a first switching device, a second switching device, and a control signal generating unit that supplies a control signal to the first and second switching devices to turn on and off the first and second switching devices so that the first switching device and the second switching device are alternately turned on and off. The control signal generating unit stops generating the control signal when receiving a state transition signal indicating that the electricity storage system transitions to and temporarily stays in a charging state while the electricity storage system is operating.