Battery Pack Converter Wakeup Control to Prevent Overdischarge
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Solution Overview
Problem
Batteries in battery packs are prone to overdischarge due to continuous voltage consumption by DC-DC converters, even when disconnected from the load, which reduces their lifespan.
Innovation Solution
A battery management apparatus that controls the operation mode of a converter unit based on battery voltage, switching to a shutdown mode when the voltage falls below a certain level to prevent unnecessary discharge, using a converter driving unit to compare the battery voltage with a preset criterion and adjust the operation mode accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DC-DC converter is continuously driven to supply power to the BMS, then the BMS can always receive power, but the battery voltage is continuously consumed leading to overdischarge
Solution Approach 1:
The converter is operated periodically rather than continuously. The control unit monitors battery voltage and activates the converter only when voltage exceeds a threshold, otherwise keeping it in shutdown mode. This periodic operation ensures the BMS receives power when needed while preventing continuous voltage consumption that leads to overdischarge.
Solution Approach 2:
The converter's operation state is dynamically adjusted based on real-time battery voltage conditions. The system transitions between active and shutdown modes depending on whether the battery voltage meets the threshold requirement, optimizing the balance between power supply reliability and energy conservation.
2Loss of energy
If the converter is kept in shutdown mode to conserve battery voltage, then overdischarge is prevented, but the BMS may not receive sufficient power when needed
Solution Approach 1:
The control unit continuously monitors battery voltage and uses this feedback to determine converter operation. When voltage drops below the threshold, the converter is shut down to conserve energy. When voltage rises above the threshold, the converter is activated to ensure reliable power supply to the BMS, creating a responsive feedback control system.
Solution Approach 2:
The system uses the battery's own voltage state to control its own power conversion operation. The converter automatically activates or shuts down based on the battery's voltage level, enabling the system to self-regulate power consumption and supply without external intervention.
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
This solution effectively prevents battery overdischarge by minimizing voltage consumption, thereby extending the battery's lifespan and reducing the risk of degradation.
Implementation Method 1
a converter unit electrically connected to a first node between a battery and one end of a positive electrode relay connected in series to the battery and configured to convert a voltage of the battery into a predetermined voltage and output the predetermined voltage based on an operation mode
Data Source
AI summary
A battery management apparatus according to an embodiment of the present disclosure includes a converter unit electrically connected to a first node between a battery and a first end of a positive electrode relay connected in series to the battery and for converting a voltage of the battery into a predetermined voltage and outputting the predetermined voltage based on an operation mode; and a converter driving unit connected to the first node to receive the battery voltage from the battery and for controlling the operation mode of the converter unit based on the battery voltage to a shutdown mode in which the converter unit is inactivated or a wakeup mode in which the converter unit is activated.