Battery Pack Impedance Detection for Adaptive Power Tool Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power tools fail to optimize performance based on the diverse characteristics of different battery packs, such as cell count, chemistry, age, temperature, and state of health, leading to suboptimal usage of battery capacity and efficiency.
Innovation Solution
A power tool system that includes a controller with sensing circuits to detect battery pack voltage and current, determining impedance and controlling motor operations based on battery pack characteristics, allowing for adaptive power management and optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the power tool uses a fixed operation mode for all battery packs, then the device complexity is reduced, but the power output and efficiency cannot be optimized for different battery characteristics
Solution Approach 1:
The system performs preliminary detection of battery pack impedance characteristics when the battery is connected to the tool. This preliminary action allows the controller to identify battery type, capacity, and health status before operation begins, enabling subsequent optimization of power output and operational parameters based on the detected characteristics without adding complex user-facing controls
Solution Approach 2:
The system continuously monitors battery pack impedance during operation and uses this feedback to dynamically adjust motor control parameters, power delivery, and operational modes. This closed-loop feedback mechanism enables real-time optimization of power output and efficiency based on actual battery performance without requiring complex manual intervention
2Reliability
If the power tool continuously monitors battery parameters, then the reliability and safety are improved, but the energy consumption increases
Solution Approach 1:
The system performs battery parameter monitoring at periodic intervals rather than continuously, measuring impedance at key moments such as battery connection, during operational phases, and at shutdown. This periodic monitoring approach maintains reliable detection of battery status and safety conditions while significantly reducing the energy consumption associated with continuous sensing and data processing
3Productivity
If the power tool optimizes performance for each battery pack type, then the productivity is improved, but the ease of operation decreases due to complex control algorithms
Solution Approach 1:
The system automatically detects battery pack characteristics and self-adjusts operational parameters without requiring user input or intervention. The controller autonomously selects appropriate power delivery modes, motor control strategies, and safety parameters based on detected battery impedance, maintaining ease of operation while optimizing productivity through adaptive performance tuning
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
Enables the power tool to adjust its operation according to the specific battery pack characteristics, optimizing power output, runtime, and efficiency, while also providing user alerts and safety features like temperature management.
Implementation Method 1
determine a battery pack impedance based on the first measurement of battery pack voltage, the second measurement of battery pack voltage, and the current from the battery pack
Data Source
AI summary
A device, such as a power tool, configured to receive a battery pack that is operable to determine a type of battery pack that is attached to the device. When the battery pack is connected to the device, the device is configured to determine an impedance of the battery pack. Based on the determined impedance of the battery pack, the device is capable of detecting the particular type of battery pack that has been attached. In some embodiments, the device is configured to be controlled based on the type of battery pack that has been detected by the device.