Single-Cell Battery Pack Interface for 170W Handheld Tools
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Solution Overview
Problem
Conventional single cell battery packs are unable to provide sufficient power for many applications, particularly handheld power tools, and face challenges in miniaturization due to power, control circuitry, and efficient power transmission requirements.
Innovation Solution
A power tool system comprising a handheld power tool and a single cell battery pack that includes a stem portion, a base portion, a terminal, and a single battery cell connected to the terminal, capable of producing a maximum output power of at least 170 watts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional single cell battery packs are used, then miniaturization of form factors is achieved, but sufficient power for handheld power tools cannot be provided
Solution Approach 1:
The patent utilizes battery cells with nominal voltages of 3.6V or 4.0V, representing a parameter change from conventional lower voltage cells. This voltage increase enables single cells to deliver sufficient power (at least 170 watts) while maintaining a compact form factor, directly resolving the contradiction between miniaturization and power output capability
2Volume of moving object
If single cell battery pack is used, then form factor miniaturization is achieved, but control circuitry and power transmission efficiency become problematic
Solution Approach 1:
The patent extracts and eliminates the need for complex control circuitry by designing a system where the single battery cell directly connects to the motor through simplified terminals. This extraction of unnecessary circuitry reduces device complexity while maintaining the compact form factor, resolving the contradiction between miniaturization and control system complexity
3Power
If conventional battery packs are used, then power transmission is adequate, but efficient power transmission to motor and control circuitry via terminal is compromised
Solution Approach 1:
The patent merges the battery cell terminals directly with the power transmission path to the motor, eliminating intermediate connection components. This merging of functions improves power transmission efficiency by reducing resistance and connection points, while also simplifying the overall terminal structure rather than complicating it
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
The system effectively powers handheld power tools with a maximum output power of at least 170 watts, addressing the limitations of conventional single cell battery packs in terms of power and miniaturization.
Implementation Method 1
a single battery cell connected to the terminal and configured to provide a maximum output power of at least 170 watts via the terminal
Data Source
AI summary
A system including a power tool and a battery pack. The system includes a power tool including a housing. The housing includes a battery pack interface that includes a first battery pack terminal and a first retaining element. The power tool also includes an electric motor and a controller. The electric motor includes an inner stator, an outer rotor, and a fan. A battery pack includes a base, a stem, a second retaining element, and a single battery cell connected to a second battery pack terminal. The battery pack produces at least a 170 watt output. The stem of the battery pack is configured to be inserted into the battery pack interface of the power tool. The second retaining element is configured to engage the first retaining element. The controller is and configured to control power supplied from the second battery pack terminal to the electric motor.