Battery Pack Microcontroller Failure Detection Circuit
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Solution Overview
Problem
Existing battery packs with lithium ion batteries require complex circuits to determine protection circuit failure, making them economically inefficient and prone to safety issues if the protection circuit fails.
Innovation Solution
A battery pack design that uses a micro-controller and analog front-end to detect voltage and control input switches, allowing for failure determination without a dedicated failure judging circuit, thereby maintaining a simple circuit structure and improving safety through software changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated failure judging circuit is provided to determine protection circuit failure, then safety is improved, but circuit structure becomes complex and economic efficiency deteriorates
Solution Approach 1:
The failure determination function is merged with the existing protection circuit components. The micro-controller unit (MCU) that already exists for battery management is extended to perform both protection control and failure determination functions, eliminating the need for separate dedicated failure judging circuitry while maintaining safety monitoring capabilities
Solution Approach 2:
The analog front-end and input switches are designed to serve multiple functions: they are used for normal voltage detection during battery operation, and the same components are utilized for failure determination by applying test voltages and analyzing responses. This multi-functionality reduces the need for additional dedicated components
2Reliability
If a dedicated failure judging circuit is provided, then failure determination capability is improved, but manufacturing cost increases
Solution Approach 1:
The failure determination circuitry is combined with existing protection circuit components rather than being manufactured as separate dedicated units. The same analog front-end, input switches, and micro-controller are used for both normal operation and failure testing, reducing component count and manufacturing complexity
Solution Approach 2:
The protection circuit performs self-diagnosis by using its own components to test itself. The micro-controller controls input switches to apply test voltages and analyzes the responses through the existing analog front-end, enabling the circuit to determine its own failure status without requiring external dedicated testing equipment
3Ease of manufacture
If the circuit structure is simplified by removing dedicated failure circuits, then manufacturing cost decreases, but failure determination capability may be compromised
Solution Approach 1:
The existing protection circuit components are designed with multi-functionality, serving both normal voltage detection during battery operation and failure determination through controlled testing. The analog front-end and input switches can operate in both modes, maintaining failure determination capability while using the same hardware infrastructure
Solution Approach 2:
The system implements feedback-based failure determination where the micro-controller applies test voltages through input switches, monitors the responses through the analog front-end, and analyzes the feedback signals to determine component status. This closed-loop approach ensures reliable failure detection using existing circuitry
Data Source
AI summary
The battery pack is provided with an analog front-end that detects battery voltage, and a micro-controller connected to the analog front-end that accepts analog voltage signals from the analog front-end as input. The micro-controller switches voltage signals input from the analog front-end to determine failure of the analog front-end or the micro-controller.