BMS Power-Gating Circuit for Low Idle Battery Pack Drain
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Solution Overview
Problem
Current battery management systems (BMS) face inefficiencies due to high current consumption, particularly when battery packs are left unattended, leading to overdischarge and reduced usable capacity, with insufficient hardware-based solutions to minimize this consumption.
Innovation Solution
A current consumption control circuit is introduced, comprising a logic element, operational amplifiers, MOSFETs, and resistance elements, which generates control signals to manage power supply and minimize current consumption by turning off unnecessary components in the BMS, such as the microcontroller unit (MCU) and power sources, using hardware-based methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery management system components remain active to monitor battery status, then battery safety and monitoring capability are improved, but current consumption increases leading to overdischarge
Solution Approach 1:
The patent implements dynamic power management by making BMS components alternately operate and sleep based on battery status. The control circuit dynamically adjusts the working state of voltage detection circuits and other components, switching between active monitoring and power-saving modes to balance safety requirements with current consumption reduction.
Solution Approach 2:
The patent employs periodic monitoring instead of continuous monitoring. The BMS components perform battery status detection at specific intervals rather than continuously, with the control circuit enabling voltage detection circuits only when needed (e.g., when voltage changes exceed a threshold) and disabling them during stable periods, thereby reducing overall current consumption while maintaining safety.
2Use of energy by moving object
If hardware components are added to control current consumption, then current consumption reduction capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the current consumption control function with the existing battery management system structure. The control circuit integrates voltage detection circuits, comparison circuits, and control switches within the existing BMS framework, combining multiple functions into a unified system rather than adding separate independent control systems, thus limiting the increase in overall complexity.
Solution Approach 2:
The BMS system performs self-control through automatic threshold comparison and state switching. When battery voltage changes exceed a predetermined threshold, the comparison circuit automatically triggers the control circuit to switch components between active and sleep states without external intervention, enabling the system to self-regulate current consumption based on its own operational status.
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 approach effectively reduces current consumption in BMS by using hardware controls to turn off power sources when necessary, thereby preventing overdischarge and maintaining battery health, enhancing the efficiency and longevity of battery packs.
Implementation Method 1
an operation unit including a control circuit, wherein the control circuit includes a plurality of switches, a plurality of operational amplifiers, and a plurality of resistance elements
Implementation Method 2
a MOSFET that is configured to have the output voltage of the operational amplifier as a driving voltage and to output an micro controller unit (MCU) alarm signal
Data Source
AI summary
An apparatus for controlling current consumption of a battery management system (BMS) managing a battery pack, including an input unit including a logic element to which a charger connection signal and an always constant power source off signal are input, an operation unit including a control circuit, the control circuit including a plurality of switches, a plurality of operational amplifiers, and a plurality of resistance elements, and the operation unit generates a current consumption control signal for at least one component in the BMS according to an output of the logic element and an output voltage of the battery pack.