Battery Pack Dynamic Current Adjustment for Tool Compatibility
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Solution Overview
Problem
Existing battery packs with reduced internal resistance can supply higher currents than designed for power tools, leading to potential damage or protection mode activation when used with older power tools that are not compatible with the increased power output.
Innovation Solution
A battery pack with a current detection circuit and control unit that adjusts discharge current based on the type of load, using a current adjustment circuit with driver circuits and switch tubes to limit or maximize current output, ensuring compatibility with both old and new power tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery pack uses reduced internal resistance construction to supply higher current, then the power output and endurance are improved, but the compatibility with existing power tools deteriorates and may cause damage or protection mode activation
Solution Approach 1:
The battery pack implements dynamic current adjustment by detecting the load type and automatically adjusting the discharge current within 5 milliseconds. The control unit changes the battery's output characteristics from static to dynamic, allowing it to adapt between high-current modes (for new power tools) and limited-current modes (for old power tools), thereby resolving the contradiction between high power output and broad compatibility
Solution Approach 2:
The invention changes the electrical parameter (discharge current) of the battery pack based on the detected load type. By detecting whether the connected device is an old or new power tool, the system adjusts the current parameter dynamically - limiting current for old tools to prevent damage while maximizing current for new tools to utilize the full power capability, thus achieving both high power and compatibility
2Productivity
If the battery pack supplies high current to new power tools, then the performance and speed are improved, but the risk of damage and protection mode activation increases when used with old power tools
Solution Approach 1:
The battery pack performs preliminary detection of the load type immediately upon connection, before supplying full power. The control unit detects whether the connected device is an old or new power tool within the first 5 milliseconds and pre-adjusts the current limit accordingly. This preliminary action prevents potential damage before it can occur while ensuring new tools receive full performance capability
Solution Approach 2:
The system implements a feedback mechanism where the control unit continuously monitors the load characteristics and adjusts the discharge current based on the detected power tool type. This closed-loop control ensures that the battery pack automatically provides high current for new tools (maximizing productivity) while limiting current for old tools (ensuring reliability and preventing damage)
Data Source
AI summary
A battery pack includes a battery set, a current detection circuit, a control unit, and a current adjustment circuit. The battery set is connected to an output terminal and the output terminal is configured to connect a load. The current detection circuit is configured to detect a discharge current of the battery set. The control unit is connected to the current detection circuit and configured to determine a type of the load based on the discharge current of the battery set and to output a control signal based on the type of the load. The current adjustment circuit is connected to the control unit and configured to adjust the discharge current in response to the control signal.