Battery Powered Chainsaw Thermal Management via Segmented Cells
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Solution Overview
Problem
Battery-operated tools face challenges such as battery storage, power management, and thermal management, which affect their performance and efficiency, particularly in high-load applications like chainsaws.
Innovation Solution
A battery-powered handheld tool with a control board that includes a multipurpose terminal for device detection and communication, an electronic brake mechanism, and a thermal management system, along with a control algorithm for motor power control, to enhance performance and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery operated tools use high-power batteries to increase motor output, then power and performance are improved, but thermal management becomes more difficult and battery storage safety deteriorates
Solution Approach 1:
The battery system is divided into multiple individual battery cells rather than using a single large battery. This segmentation allows for distributed thermal management, where each cell can be monitored and cooled independently, reducing the risk of thermal runaway spreading and improving overall thermal control efficiency.
Solution Approach 2:
A battery management system (BMS) is introduced as an intermediary between the battery cells and the motor load. The BMS regulates power distribution, monitors cell temperatures, and controls charging/discharging rates, thereby managing thermal loads and preventing overheating while maintaining high power output capability.
2Duration of action of moving object
If battery capacity is increased to extend runtime, then duration of action is improved, but device weight and storage space requirements increase
Solution Approach 1:
The battery system uses multiple modular battery cells that can be independently managed. This allows the tool to optimize power distribution across cells, extending effective runtime through intelligent power management rather than simply increasing total battery capacity, thereby avoiding excessive weight gain.
Solution Approach 2:
The system dynamically adjusts operating parameters such as motor power output, PWM duty cycle, and battery discharge rates based on thermal conditions and power demands. This allows the tool to maximize runtime by operating at optimal efficiency points rather than constant high power, extending duration without proportionally increasing battery capacity and weight.
3Power
If high current is drawn from battery to increase motor power, then motor output is improved, but battery current capacity requirements and thermal loads increase
Solution Approach 1:
The system uses pulse-width modulation (PWM) to deliver power to the motor in controlled pulses rather than continuous high current. This periodic action allows the motor to achieve high average power output while the battery experiences intermittent current draws with cooling intervals, reducing peak current capacity requirements and thermal management demands.
Solution Approach 2:
A motor controller with PWM capability serves as an intermediary between the battery and motor. It converts lower-current periodic signals into high-power motor operation through efficient switching, allowing the battery to deliver average power at manageable current levels while the motor receives the high instantaneous power needed for high output.
Data Source
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AI summary
Embodiments provide methods, apparatuses, and systems for battery operated tools, such as chainsaws, are provided. In accordance with embodiments herein, a chainsaw may include various components, such as a control board having a controller, a battery terminal block, a motor, a brake switch, a trigger switch, and/or other components. In various embodiments, components of the battery operated tool are provided that improve the capabilities and/or operation of the tool.