Battery Overload Notification for Power Tools
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Solution Overview
Problem
Existing electric power tools with overload protection functions do not provide users with advance notice of when the tool will stop due to battery overload, leading to inconvenient and unexpected tool shutdowns.
Innovation Solution
An apparatus for an electric power tool that includes a detection unit to monitor battery load conditions, a determination unit to assess overload states, a calculation unit to estimate the remaining time until overload protection activates, and a notification unit to inform the user of this time, allowing for proactive action to prevent tool shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overload protection function is implemented to detect and interrupt discharge path when battery reaches overload state, then battery protection is improved, but user convenience deteriorates due to unexpected tool shutdown without advance notice
Solution Approach 1:
The notification unit provides advance notice to the user before the protection unit interrupts the discharge path. This preliminary action allows the user to be informed of the upcoming shutdown and take appropriate measures, resolving the contradiction by maintaining battery protection while improving user convenience through advance warning.
2Device complexity
If only load level indication is provided using indicator elements, then device complexity is reduced, but information completeness deteriorates as user cannot know remaining time until overload protection activation
Solution Approach 1:
The notification unit serves multiple functions: it can display both the current load level and the remaining time until overload protection activation using the same indicator elements. This multi-functionality resolves the contradiction by providing complete information without increasing device complexity.
3Loss of information
If calculation unit estimates remaining time until overload state based on detection unit data, then user awareness is improved, but device complexity increases due to additional calculation functionality
Solution Approach 1:
The calculation unit is integrated with the existing detection unit and notification unit, combining multiple functions into a unified control system. The calculation unit processes detection data and provides time estimates through the same notification interface, resolving the contradiction by providing enhanced information while minimizing the increase in device complexity through functional integration.
Data Source
AI summary
An apparatus for an electric power tool includes a detection unit, a determination unit, a protection unit, a calculation unit, and a notification unit. The calculation unit calculates a time-equivalent value representing a remaining time until a load condition of a battery reaches an overload state, in which the protection unit interrupts a discharge path, based on the result of the detection by the detection unit. The notification unit notifies a user of the electric power tool of a remaining time until the protection unit interrupts the discharge path based on the time-equivalent value calculated by the calculation unit.