Hardware Battery Protection Circuit for Overcharge Prevention
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Solution Overview
Problem
Existing battery management systems (BMS) in electric motor vehicles face challenges in maintaining battery cell performance and effectively controlling charging and discharging, particularly due to software errors and hardware limitations that can lead to overcharge or overdischarge issues, which can degrade battery health and safety.
Innovation Solution
A battery management system that includes a reference voltage generator, comparator, and switch configured to control current flow based on battery voltage comparisons, using hardware to manage battery charging and discharging without software control, ensuring safe operation by blocking current flow when voltage thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If software control is used to manage battery charging and discharging, then the system can implement complex control logic and monitoring functions, but the system becomes vulnerable to software errors and hardware limitations that can lead to overcharge or overdischarge issues
Solution Approach 1:
The control system is segmented into two independent parts: a software-based BMS for complex control logic and monitoring, and a hardware-based protection circuit for critical safety functions. The hardware circuit independently monitors battery voltage and current, and can immediately block charging/discharging operations without relying on software, thus preventing overcharge and overdischarge even when software fails.
Solution Approach 2:
A hardware protection circuit acts as an intermediary safety layer between the battery and the software control system. This hardware circuit continuously monitors battery parameters and can directly control switching elements to prevent dangerous conditions, serving as a mediator that ensures safety regardless of software state.
2Reliability
If hardware protection circuits are added to prevent overcharge and overdischarge, then battery safety is improved, but the device complexity increases
Solution Approach 1:
The hardware protection circuit is designed to autonomously monitor battery parameters and trigger protection mechanisms without requiring external software intervention. The circuit self-regulates by comparing battery voltage/current against preset thresholds and automatically controlling switching elements, eliminating the need for complex centralized control while maintaining high reliability.
Solution Approach 2:
The patent replaces software-based control mechanisms with hardware-based electrical circuits for critical safety functions. By using analog voltage comparison and current sensing circuits instead of software algorithms, the system achieves reliable protection with simpler, more direct electrical mechanisms that are inherently more responsive and fail-safe.
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 maintains battery health by preventing overcharge and overdischarge through hardware-controlled switching, enhancing safety and efficiency by using hardware to manage battery power supply directly, thus overcoming software limitations and potential errors in conventional BMS systems.
Implementation Method 1
a reference voltage generator connected in parallel to the battery and configured to generate a reference voltage
Implementation Method 2
a comparator for comparing a battery voltage from a terminal of the battery with a reference voltage output by the reference voltage generator
Implementation Method 3
a switch for blocking a current flow of the battery according to an output signal generated by the comparator
Implementation Method 4
a transistor that is configured to turn on in response to the output signal generated by the comparator in order to open the switch
Data Source
AI summary
A battery management system (BMS) in which a battery protection circuit controls a main switch using hardware without software control, thereby coping with troubles in the BMS or software errors.