Battery Cell Balancing Control With Split Timer Power Supply
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Solution Overview
Problem
The existing battery management devices for hybrid electric vehicles and electric vehicles face high power consumption during voltage balancing due to the use of separate timers powered by different sources, which affects reliability and efficiency.
Innovation Solution
A battery management device with a cell controller and control unit that includes a main timer for measuring elapsed time and a stop management unit to stop the cell controller when the main timer is abnormal, using distinct power supplies for the main timer and control unit, thereby reducing power consumption during balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate timers are provided in both the voltage equalization circuit and control means, then reliability in balancing is improved, but power consumption during balancing increases
Solution Approach 1:
The patent divides the timing function into two separate components: a main timer in the control means and a sub timer in the voltage equalization circuit. This segmentation allows the sub timer to operate independently using local power supply, while the main timer uses a different power source, thereby maintaining reliability through distributed timing functions while reducing overall power consumption during balancing operations.
2Ease of operation
If the vehicle is stopped for voltage balancing, then balancing can be performed, but high power consumption and heat dissipation issues occur
Solution Approach 1:
The patent implements periodic balancing operations that can be executed during vehicle stops. The main timer controls the overall balancing schedule, while the sub timer manages individual equalization cycles. This periodic approach allows balancing to occur during naturally occurring stop periods without requiring continuous high-power operation, thereby reducing overall energy loss and heat dissipation.
Data Source
AI summary
To improve reliability in balancing while suppressing power consumption during balancing. A battery management device 1 includes cell cons 41 and 42 that perform balancing for adjusting voltages of a plurality of battery cells 2 that are secondary batteries, and a control unit 3 that controls the cell cons 41 and 42. The cell con 41 includes the main timer 412 that measures the elapsed time for stopping the cell con 41, and the stop management unit 413 that stops the cell con 41 when the main timer 412 is abnormal. In the battery management device 1, the battery cell 2 that supplies power to the main timer 412 and the stop management unit 413, and the lead storage battery 7 that supplies power to the control unit 3 are power supplies different from each other.