Dual-Battery Pack Switching for Tool Power and USB Charging
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Solution Overview
Problem
Traditional dual-voltage lithium battery packs primarily power electric tools but lack functionality to charge external devices, limiting their application in various scenarios.
Innovation Solution
A battery pack power supply system incorporating a first and second battery set, a switch control circuit with electronic switches, a main control chip, a wake-up circuit, a USB circuit, and a self-locking circuit, allowing the battery sets to be connected in series or parallel, and enabling power output for external device charging through a USB interface with voltage step-down and current-limiting capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional dual-voltage lithium battery pack is designed to power electric tools only, then the device structure remains simple, but the adaptability and versatility are limited
Solution Approach 1:
The battery pack is designed to perform multiple functions: powering electric tools through the electric tool interface and charging external devices through the USB interface. The switch control circuit and main control chip enable the battery pack to adapt between different power supply modes (series connection for higher voltage to electric tools, parallel connection for lower voltage to USB devices), thereby achieving multi-functionality and expanding adaptability without requiring completely separate systems.
2Adaptability or versatility
If the battery pack provides both series and parallel connection capabilities for dual-voltage output, then the versatility is improved, but the device complexity increases due to additional electronic switches and control circuits
Solution Approach 1:
The patent replaces mechanical switching methods (such as physical connectors or mechanical relays) with electronic switches controlled by a main control chip. The switch control circuit uses electronic components (MOSFETs or similar semiconductor switches) to achieve series and parallel connections of battery groups, which are controlled digitally by the main control chip based on detection signals. This substitution reduces mechanical wear, improves switching speed, and enables more precise control while managing the complexity through integrated circuit design.
3Adaptability or versatility
If the battery pack enables power output to external devices, then the versatility is improved, but the reliability may be compromised without proper protection mechanisms
Solution Approach 1:
The main control chip continuously detects the working state of the battery pack, including voltage levels, current flow, and connection status. Based on this feedback, the control chip dynamically adjusts the switching state of the electronic switches to ensure safe operation. For example, when the battery pack is connected to an electric tool, the control chip detects the connection and configures the appropriate voltage output; when connected to a USB device, it detects the USB interface and switches to parallel connection mode for lower voltage output, thereby maintaining reliability through real-time monitoring and adaptive control.
Solution Approach 2:
The self-locking circuit is designed to automatically disable the electronic switches when the switch control circuit is disabled or in fault conditions, preventing potential harmful effects such as short circuits or uncontrolled power discharge. This preliminary protective measure ensures that even if the main control chip fails or the switch control circuit becomes unstable, the battery pack remains safe and cannot cause damage, thereby prioritizing system reliability and safety.
Data Source
AI summary
The present disclosure provides a battery pack power supply system and a battery pack power supply method. The battery pack power supply system comprises: a first battery set and a second battery set; a switch control circuit connected with electronic switches, to control the first battery set and the second battery set to be connected in series or in parallel; and a main control chip connected with the first battery set, the second battery set, and the switch control circuit, respectively, to control the electronic switches to be open or closed to discharge the first battery set and the second battery set; a wake-up circuit connected with the main control chip, to wake up the entire battery pack power supply system; a USB circuit connected with the first battery set, the second battery set, and the main control chip, respectively, to output power for charging an external device under the control of the main control chip; and a self-locking circuit connected with the switch control circuit, to disable the electronic switches when the switch control circuit is prohibited.