Battery Cover Venting Structure for Water-Safe Power Tools
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Solution Overview
Problem
Existing electric power tools, such as chainsaws, face issues with water ingress at connection terminals due to rainwater and heat accumulation within the housing, leading to potential battery malfunction.
Innovation Solution
The design includes a battery compartment with an upward-facing gap and a rotatable cover that exposes this gap to the outside, preventing water ingress and dissipating heat generated by the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the battery pack is covered by the cover to prevent water ingress, then water protection is improved, but heat accumulation inside the housing increases
Solution Approach 1:
The cover is segmented into a main body portion that covers the battery pack and a separate protrusion portion that extends upward. This segmentation allows the cover to provide water protection while the protrusion portion creates an open space for heat dissipation, resolving the contradiction between sealing and ventilation.
Solution Approach 2:
The cover has different structural characteristics at different locations: the main body provides sealing for water protection, while the protrusion portion creates an open, ventilated space. This local differentiation allows simultaneous achievement of water protection and heat dissipation.
2Reliability
If the housing is sealed to prevent water contact with connection terminals, then electrical safety is improved, but heat dissipation from the battery pack is restricted
Solution Approach 1:
The sealing structure is segmented such that the main body of the cover provides electrical sealing for connection terminals, while the protrusion portion creates an independent ventilated space. This allows electrical safety to be maintained while heat dissipation is enabled through the protrusion opening.
Solution Approach 2:
The protrusion portion acts as an intermediary structure that mediates between the sealed housing and the need for heat dissipation. It provides a controlled opening that allows air flow for cooling while maintaining the overall sealed structure for electrical safety.
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 configuration effectively prevents water from contacting connection terminals and dissipates heat, ensuring the battery operates safely and reliably.
Implementation Method 1
a battery compartment configured to form a gap opening upward with respect to a battery in a state where the battery is inserted from above
Data Source
AI summary
An electric power tool is provided that is configured to prevent water such as rainwater from coming into contact with connection terminals to which a battery is electrically connected, while also suppressing accumulation of heat generated by the battery. The electric power tool includes a main body section including: a battery compartment configured to form a gap opening upward with respect to the battery in a state where the battery is inserted from above, and a cover attached to the battery compartment so as to cover the battery from above, the cover being configured to expose the gap to outside when attached to the battery compartment; and an electric work section provided at a front side of the main body section and configured to operate with power supplied from the battery.