Solid-State BMS PCBA for High-Current Switching and Thermal Protection
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Solution Overview
Problem
Conventional Battery Management Systems (BMS) for high-current applications face challenges with thermal management, connecting/disconnecting high energy sources, responding to abnormal conditions like short circuits, and ensuring safety due to the bulkiness, high cost, and unreliability of mechanical contactors and fuses, especially in high-vibration environments.
Innovation Solution
Integration of solid-state FETs, current sensing, and other battery management components onto a single printed circuit board assembly (PCBA) with advanced monitoring, driving, protection, and thermal management systems, including solid-state precharge circuits, fast gate turn-off circuits, energy clamping, and redundant overcharge/overvoltage detection, to enhance efficiency, reliability, and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical contactors and fuses are used for high current disconnection, then high current capability is achieved, but device size increases and reliability decreases
Solution Approach 1:
The patent replaces mechanical contactors with solid-state FETs (Field Effect Transistors) that can handle high currents up to 500A. The FETs are mounted on a metal core PCB with direct thermal path to heat sinks, eliminating mechanical moving parts while maintaining high current capability and improving reliability in vibration environments.
Solution Approach 2:
The patent changes the operating parameters by using multiple FETs in parallel configuration to achieve high current handling capability. Each FET operates within its optimal current range, and the parallel arrangement provides both high current capability and reduced individual device stress, improving overall reliability.
2Reliability
If mechanical contactors are used for battery disconnection, then high current handling is achieved, but response time increases
Solution Approach 1:
The patent replaces mechanical contactors with solid-state FETs controlled by microcontroller units (MCUs). The electronic control system can detect abnormal conditions and trigger FET shutdown within microseconds, providing instantaneous protection compared to the slow mechanical actuation of traditional contactors.
Solution Approach 2:
The patent implements monitoring circuits that continuously detect battery voltage, current, and temperature parameters. When abnormal conditions are detected, the system provides feedback to the MCU which immediately triggers the FETs to shut off, creating a closed-loop safety system with rapid response time.
3Reliability
If separate contactor and fuse components are used, then high current capability is achieved, but system complexity increases
Solution Approach 1:
The patent integrates multiple functions into a single unified system: FETs for disconnection, current sensing circuits for monitoring, temperature sensors for thermal management, and protection circuits all mounted on one metal core PCB assembly. This consolidation reduces the number of separate components and interconnections while maintaining high current capability and improving reliability.
Solution Approach 2:
The metal core PCB serves multiple functions simultaneously: it provides mechanical support for high-current FETs, acts as a thermal management system with integrated heat sinks, functions as a current sensing platform with shunt resistors, and serves as the structural backbone for the entire battery management system.
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 results in a more efficient, cost-effective, and reliable BMS that can handle high currents safely and quickly respond to faults, reducing the risk of short circuits and improving thermal management, thus enhancing the overall performance and safety of high-current applications.
Implementation Method 1
solid-state FETs, current sensing, and other battery management components onto a single printed circuit board assembly (PCBA)
Implementation Method 2
current shunt sensor
Implementation Method 3
thermal management systems
Implementation Method 4
thermal management systems
Data Source
AI summary
A Battery Management System (BMS) integrating solid-state relay and current shunt sensor on a single printed circuit board assembly (PCBA), in lieu of traditional electro-mechanical contactors and fuses and external current sensor, is disclosed. The associated monitoring, driving, protection and energy clamping circuitries, and thermal management design to enable high-current and safety-critical applications are also disclosed.