Parallel Relay and Switch Control Circuit for Battery Branch Power Loss Reduction
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Solution Overview
Problem
High power loss and reduced system availability in battery systems due to large currents flowing through battery branches, which are formed by coupling multiple battery cells in series and parallel, leading to inefficiencies in power supply and reception.
Innovation Solution
A control circuit comprising a relay unit and a switch unit, both MOSFET-based, coupled in parallel with the battery branch, and controlled by a control unit to selectively conduct branch currents, reducing equivalent resistance and power loss while ensuring immediate power supply and charging operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery branches are coupled in parallel to form a high power battery system, then the total current supply capability is improved, but the power loss increases due to large current flowing through each branch
Solution Approach 1:
The patent divides the battery system into multiple independent battery branches, each with its own control circuit. This segmentation allows individual control of current distribution across branches, enabling optimization of power loss while maintaining total current supply capability. Each branch can be independently managed to balance the load and reduce overall power loss.
2Reliability
If relay units are used to control battery branches, then the system availability is improved, but the relay device life is reduced due to frequent switching operations
Solution Approach 1:
The patent introduces a control circuit as an intermediary between the control signal and the relay unit. This control circuit intelligently manages the switching operations, optimizing when relays are activated or deactivated. By using the control circuit as a mediator, the system achieves high availability through responsive control while minimizing unnecessary relay switching, thereby extending relay device life.
3Power
If multiple battery branches are used to provide high power, then the power supply capability is improved, but the current flowing through each branch increases leading to higher power loss
Solution Approach 1:
The patent implements dynamic control of battery branches through control circuits that can adjust the operational state of each branch in real-time. This dynamic adjustment allows the system to optimize current distribution across branches based on actual power demands and branch conditions, maintaining high power supply capability while minimizing power loss by actively managing current flow rather than using static configurations.
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 reduces power loss, increases system availability, prolongs the life of relay devices, and provides over-current protection, ensuring efficient and timely power delivery in battery systems.
Implementation Method 1
reducing equivalent resistance and power loss
Implementation Method 2
selectively conduct branch current flowing through the battery branch
Data Source
AI summary
A control circuit of a battery branch in a battery system is provided. The control circuit includes a relay unit, a switch unit and a control unit. The relay unit is coupled to the battery branch. The switch unit is coupled in parallel with the relay unit. The control unit is coupled to the relay unit and the switch unit, and is arranged for controlling switching of the relay unit and the switch unit in order to selectively conduct a branch current flowing through the battery branch. A control method of a battery branch in a battery system is provided. The control method includes the following steps: coupling a relay unit to the battery branch, and coupling a switch unit in parallel with the relay unit; and controlling switching of the relay unit and the switch unit in order to selectively conduct a branch current flowing through the battery branch.