Power Pack Series Balancing Circuit for Voltage Imbalance
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Solution Overview
Problem
Battery systems with interconnected batteries face performance issues due to variations in capacity, self-discharge rates, and impedance, leading to voltage imbalances and potential system failure when drawing high current.
Innovation Solution
A power pack design featuring parallel and series groups of power sources with a series balancing circuit that balances voltage across the series groups, allowing power sources to recharge each other and disconnecting underperforming sources to maintain system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple batteries are connected in series to increase voltage and power output, then the power capability of the system is improved, but voltage imbalances occur due to variations in battery capacity, self-discharge rates, and impedance
Solution Approach 1:
The battery system is divided into multiple parallel groups, where each group contains batteries connected in series. This segmentation allows independent voltage balancing within each parallel group while maintaining overall system power output, resolving the contradiction between power capability and voltage balance.
Solution Approach 2:
A series balancing circuit is introduced as an intermediary component between batteries in series connections. This circuit actively monitors and adjusts voltage levels across individual batteries, preventing voltage imbalances from developing while maintaining the high power output capability of series connections.
2Power
If high current is drawn from the battery system to meet power demands, then the power delivery capability is improved, but individual batteries may fail due to voltage dropping to dangerously low levels
Solution Approach 1:
The series balancing circuit performs preliminary voltage equalization across all batteries before high current draw occurs. By pre-balancing the voltage levels and continuously monitoring during operation, the system prevents any single battery from dropping to dangerously low voltage levels even under high power delivery conditions.
3Adaptability or versatility
If batteries with different capacities and characteristics are used to optimize system performance, then the adaptability and power capability are improved, but the complexity of managing voltage balance increases
Solution Approach 1:
The series balancing circuit automatically detects and corrects voltage imbalances without requiring external intervention or complex management systems. The circuit self-regulates by redirecting current flow between batteries based on their individual voltage levels, enabling the system to handle diverse battery configurations while maintaining simplicity in operation.
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 power pack effectively balances voltage across both parallel and series groups, preventing voltage imbalances and system failures, ensuring stable operation even with varying battery performance.
Implementation Method 1
a series balancing circuit configured to balance the voltage of the power sources in one of the series groups such that one or more power sources in the series group recharges one or more other power sources in the same series group
Data Source
AI summary
The power pack includes a plurality of parallel groups. Each parallel group includes a plurality of electrical power sources connected in parallel. The pack also includes a plurality of series groups. Each series group connects in series one of the power sources from each of the parallel groups. The pack also includes a series balancing circuit configured to balance the voltage of the power sources in one of the series groups such that one or more power sources in the series group recharges one or more other power sources in the same series group.