Hand-Held Power Tool Fanless Battery Cooling via Dynamic Airflow
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Solution Overview
Problem
Hand-held power tools, such as hammer drills, face inefficiencies in cooling both the storage battery and electric drive motor, leading to potential performance and functionality issues due to heat generation during operation.
Innovation Solution
The integration of a tool housing with strategically located vent portions and a flow control mechanism allows the cooling fan to direct airflow either through the storage battery or the drive motor, or both, with a change-over flap and temperature sensors to regulate airflow based on temperature readings, ensuring effective cooling without a separate cooler for the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a separate cooler is provided in the storage battery, then the storage battery can be cooled independently, but the device complexity increases
Solution Approach 1:
The patent merges the cooling function for both the storage battery and drive motor into a single integrated cooling system. The cooling fan draws air through a common airflow path that passes through both the storage battery and the drive motor, eliminating the need for separate coolers and reducing overall system complexity while maintaining effective cooling for both components.
2Adaptability or versatility
If a change-over flap with multiple switch positions is used, then airflow can be distributed flexibly between storage battery and drive motor, but the device complexity increases
Solution Approach 1:
The patent employs a dynamic flow control mechanism with a change-over flap that can be actuated by a control device to adjust airflow distribution in real-time. The flap can be positioned in multiple switch positions to direct airflow preferentially to either the storage battery or drive motor based on their respective cooling needs, providing adaptability while using a relatively simple mechanical implementation.
Solution Approach 2:
The flow control mechanism incorporates temperature sensors that monitor the temperatures of both the storage battery and drive motor, providing feedback to the control device. Based on this feedback, the control device actuates the change-over flap to adjust airflow distribution dynamically, ensuring optimal cooling for both components without requiring complex manual intervention.
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
This solution provides improved cooling efficiency for both the storage battery and the drive motor, preventing critical temperature rises and maintaining tool performance by dynamically controlling airflow distribution based on temperature needs.
Implementation Method 1
the fanless storage battery being designed to be force-cooled by means of a volume flow generated by the cooling fan of the hand-held power tool
Data Source
AI summary
A hand-held power tool, in particular a hammer drill or a combination hammer, is disclosed. The hand-held power tool includes a tool housing which has a receiving recess designed to replaceably receive a storage battery or a power supply unit. The hand-held power tool has an electric drive motor with a cooling fan. The tool housing has a first vent portion which is located in the receiving recess and through which a volume flow generated by the cooling fan can be guided.