FET-Driven Battery Converter Control to Prevent Overdischarge
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Solution Overview
Problem
Batteries are prone to overdischarge due to continuous voltage consumption by DC-DC converters, leading to reduced lifespan, and there is a need for a technology to control the converter operation to prevent this.
Innovation Solution
A battery management apparatus with a converter unit and a converter driving unit that can be controlled to a shutdown mode when not in use, using a FET and FET control unit to manage the battery voltage and prevent unnecessary consumption, and a control unit to manage the operation state of the relay based on the converter mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DC-DC converter is continuously driven to supply power to the battery management system, then the power supply to the BMS is maintained, but the battery voltage is continuously consumed leading to overdischarge
Solution Approach 1:
The patent implements periodic action by controlling the DC-DC converter to operate in alternating active and standby modes. The converter is activated only when power supply is needed and deactivated when not needed, creating a periodic on-off operation pattern that prevents continuous energy consumption while maintaining reliable power supply to the BMS system.
Solution Approach 2:
The patent applies dynamics by making the converter's operation state changeable between active and standby modes based on real-time power supply needs. The converter driving unit dynamically adjusts the converter's operation state according to whether power supply is required, transforming the static continuous operation into a dynamic adaptive operation that optimizes energy consumption.
2Reliability
If the converter is kept in active mode to ensure power supply, then the BMS receives continuous power, but the battery lifespan is reduced due to overdischarge
Solution Approach 1:
The patent implements feedback control where the converter driving unit monitors the power supply status and battery state, then adjusts the converter's operation mode accordingly. When power supply is not needed, the system receives feedback to switch the converter to standby mode, preventing unnecessary battery discharge and extending battery lifespan while maintaining reliable power supply when needed.
Solution Approach 2:
The system applies self-service by automatically managing the converter's operation modes based on its own power supply needs without external intervention. The converter driving unit autonomously determines when to activate or deactivate the converter based on whether the BMS requires power, enabling the system to self-regulate energy consumption and protect battery lifespan.
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 controlling the converter operation, minimizing voltage consumption and extending the battery's lifespan.
Implementation Method 1
The converter driving unit may include a FET connected between the node and the converter unit and configured to control the operation mode of the converter driving unit by sending the battery voltage input from the node to the converter unit according to an operation state
Data Source
AI summary
A battery management apparatus according to an embodiment of the present disclosure includes a converter unit electrically connected to a node between a battery and one 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 output the predetermined voltage based on an operation mode; and a converter driving unit connected to the node to receive the battery voltage from the battery and for controlling the operation mode of the converter unit to a shutdown mode in which the converter unit is inactivated or a wakeup mode in which the battery voltage is applied as a driving power to activate the converter unit according to whether a converter driving signal is input from the outside.