Synchronized Battery Management Circuit for Low-Loss Voltage Balancing
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Solution Overview
Problem
Conventional energy storage devices experience significant power loss during voltage balancing due to variance in switching timings of switches, leading to inefficient voltage balancing operations.
Innovation Solution
A battery management circuit is introduced for each set of battery cells connected in series, featuring a control circuit that synchronizes connection operations with other battery management circuits, reducing power loss by ensuring synchronized switching without signal transmission lines, thereby minimizing unnecessary current flow and power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If voltage balancing operation is performed using conventional techniques, then voltage balancing is achieved, but great power loss occurs
Solution Approach 1:
The patent divides the voltage balancing control into independent battery management circuits, each managing a specific battery cell. Each circuit has its own control switch and capacitor, allowing independent optimization of switching operations to minimize power loss during voltage balancing operations.
Solution Approach 2:
The control circuit determines the optimal switching timing in advance by monitoring battery voltage levels and predicting when voltage balancing will be needed. This preliminary assessment allows the system to prepare switching operations to minimize power loss before the actual balancing occurs.
2Loss of energy
If switching operations are performed without synchronization, then operation simplicity is maintained, but variance in switching timings causes power loss
Solution Approach 1:
The control circuit continuously monitors battery voltage levels and uses this feedback to adjust switching timing. Each battery management circuit receives feedback from its associated battery cell and automatically synchronizes its switching operations with other circuits, eliminating the need for complex external synchronization signals while minimizing power loss.
Solution Approach 2:
Each battery management circuit autonomously determines its switching timing based on its own battery's voltage levels and the operational status of other circuits. This self-service approach allows each circuit to independently optimize its operations while maintaining synchronization, reducing overall system complexity.
3Loss of energy
If connection operations are performed asynchronously, then response speed is faster, but unnecessary current flow increases power loss
Solution Approach 1:
The control circuit performs preliminary assessment of battery voltage levels and predicts optimal switching timing before actual voltage balancing is needed. This advance preparation allows the system to execute switching operations at precisely the right moment, minimizing unnecessary current flow and power loss while maintaining fast response speed.
Data Source
AI summary
A battery management circuit that is provided for each of sets of battery cells connected in series in an energy storage device including the sets of the battery cells and at least one capacitor, and that includes: a positive connection terminal to be connected to a positive electrode of a corresponding one of the sets of the battery cells; a negative connection terminal to be connected to a negative electrode of the corresponding one of the sets of the battery cells; a capacitor connection terminal to be connected to a terminal of the at least one capacitor; and a control circuit that controls a connection operation of connecting the positive connection terminal or the negative connection terminal to the capacitor connection terminal, and causes the battery management circuit to perform the connection operation in synchronization with the connection operation of another battery management circuit among battery management circuits.