Battery Interface Circuit Managing Voltage Class Mismatch
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Solution Overview
Problem
Existing electrical devices require multiple battery packs of specific voltage classes, limiting flexibility and necessitating multiple purchases, with potential for overvoltage damage and reduced service life due to equalizing currents in parallel connections.
Innovation Solution
An electrical device with a control or regulating circuit that connects exchangeable battery packs in series or parallel to maintain a maximum permissible voltage, allowing flexible use of different voltage classes while preventing overvoltage and equalizing currents, and dynamically switches between packs based on temperature and charge state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery packs of different voltage classes are connected in parallel to increase power, then the power output is improved, but equalizing currents arise between battery packs causing reduced service life and potential damage
Solution Approach 1:
The system segments the battery connection control by voltage class, automatically identifying and separating battery packs into different voltage groups. This prevents direct parallel connection of mismatched voltage classes, eliminating equalizing currents while still allowing parallel operation within the same voltage class to achieve high power output.
Solution Approach 2:
The control circuit acts as an intermediary between battery packs and the power tool, managing the connection logic. It detects voltage classes and configures series/parallel connections appropriately, preventing harmful equalizing currents while enabling safe parallel operation for high-power applications.
2Duration of action of moving object
If battery packs of higher voltage class are used to extend operating time, then the operating duration is improved, but the risk of overvoltage damage increases
Solution Approach 1:
The system dynamically configures battery connections based on detected voltage classes and the specific power tool's requirements. It adaptively switches between series and parallel configurations, ensuring the output voltage always matches the tool's maximum permissible voltage while maximizing operating time through optimal battery pack utilization.
Solution Approach 2:
The control circuit receives feedback from voltage class detection and continuously monitors battery pack characteristics. Based on this feedback, it automatically adjusts the connection configuration to prevent overvoltage conditions while extending operating time through intelligent battery management.
3Power
If multiple battery packs are connected in series to increase voltage, then the voltage output is improved, but the complexity of managing different voltage classes increases
Solution Approach 1:
The control circuit performs self-service by automatically detecting voltage classes and configuring series connections without user intervention. The system autonomously identifies which battery packs should be connected in series to achieve the required voltage, eliminating the need for users to manually manage complex multi-voltage configurations.
Solution Approach 2:
The system changes connection parameters (series/parallel configuration) based on detected voltage class parameters. It automatically adjusts the electrical connection topology to match the combined voltage of connected battery packs with the power tool's requirements, simplifying voltage management through automatic parameter adaptation.
4Device complexity
If a single battery interface design is used for all voltage classes, then the device complexity is reduced, but the adaptability to different voltage classes is limited
Solution Approach 1:
The system achieves universality through a single battery interface design that can accommodate battery packs of different voltage classes. The control circuit provides multi-functionality by automatically detecting voltage classes and configuring appropriate series or parallel connections, enabling one interface design to serve multiple voltage requirements without requiring separate specialized interfaces.
Data Source
AI summary
An electrical device includes a control or regulating circuit and a plurality of electromechanical battery interfaces configured to supply the electrical device with a maximum permissible operating voltage using at least one exchangeable battery pack, which is releasably accommodated by the electromechanical battery interfaces. The electromechanical battery interfaces are configured such that exchangeable battery packs of at least two different voltage classes can be accommodated. The control or regulating circuit electrically connects several exchangeable battery packs of a lower voltage class in series and/or in parallel such that a resulting battery voltage does not exceed the maximum permissible supply voltage.