Back-Mounted Power Tool Battery Layout for Higher Power and Lower Fatigue
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Solution Overview
Problem
Conventional battery-powered power tool systems face challenges with limited operation time due to low battery voltage, increased weight and size when trying to enhance power, and limited flexibility and convenience due to fixed battery configurations.
Innovation Solution
A back-mounted power tool system that includes a battery package, a backpack apparatus, and a connecting member, allowing the battery package to be removably coupled to the backpack, distributing the weight and enabling the power tool to rotate, thus reducing user fatigue and increasing operation time and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the voltage of the battery is increased to supply more power to the motor, then the power and efficiency of the power tool system is improved, but the weight and size of the battery increases
Solution Approach 1:
The battery system is divided into multiple separate battery packs that can be used individually or combined. Instead of one large high-voltage battery, the system uses multiple lower-voltage battery packs (e.g., two 18V packs to achieve 36V operation) that can be attached separately to the backpack apparatus, distributing the weight and allowing flexible configuration based on power needs.
Solution Approach 2:
The battery configuration moves from a single-unit vertical stacking approach to a multi-dimensional arrangement where battery packs can be distributed across the backpack apparatus in different orientations and positions. This allows the same total power capacity to be achieved with better weight distribution and balance.
2Power
If the number of battery cells is increased to achieve high voltage, then the power supplied to the motor is increased, but the overall weight and size of the battery and power tool system increases
Solution Approach 1:
The battery system uses multiple separate battery packs instead of one large battery assembly. Each pack contains a manageable number of cells, and the packs are distributed across the backpack apparatus. This segmentation reduces the volume concentration in any single location and allows for more efficient space utilization.
Solution Approach 2:
The battery packs are designed to be universal and interchangeable, capable of being used in different configurations and with different power tools. The same battery packs can be used individually or combined, providing multiple functions and reducing the need for specialized large-volume battery assemblies for different power levels.
3Power
If the battery is made specially for a particular type of power tool, then the power supply is optimized for that tool, but the flexibility and convenience for operating different power tools is reduced
Solution Approach 1:
The battery packs are designed with universal connectors and standardized interfaces that allow them to be used with multiple types of power tools. The same battery packs can be attached to different tools and to different backpack apparatus configurations, providing both optimized power supply and broad adaptability across the power tool system.
Solution Approach 2:
The battery system is designed to be dynamically reconfigurable, allowing users to adjust the number and arrangement of battery packs based on the specific power tool being used and the task requirements. This dynamic configuration maintains power optimization while adapting to different tool and application needs.
4Device complexity
If the battery forms part of the system and cannot be modified, then the system structure is simplified, but the ability to add or reduce battery cells is limited
Solution Approach 1:
The battery system is segmented into modular battery packs that can be independently attached or removed from the backpack apparatus. This segmentation maintains relatively simple system structure while enabling easy modification of battery configuration by simply adding or removing packs without complex internal modifications.
Solution Approach 2:
The battery configuration is made dynamic and adjustable through the use of removable battery packs with standardized interfaces. Users can easily modify the battery configuration by attaching or detaching packs, providing adaptability without requiring complex internal system changes or specialized tools.
Data Source
AI summary
Embodiments of the disclosure are directed to a back-mounted power tool system. The power tool system includes a battery package that can be used on other power tool systems, a backpack apparatus, a power tool, and a connecting member. The backpack apparatus includes a backpack harness to mount the backpack apparatus onto a user's body and a first connector to removably couple the battery package to the backpack apparatus. The power tool includes a motor driven by a power supply from the battery package. The connecting member transfers a weight of the power tool and/or a force received from the power tool to the backpack apparatus by rotatably coupling the power tool to the backpack apparatus. The connecting member further enables the power tool to rotate about a first rotation axis or a second rotation axis, the first rotation axis being perpendicular to the second rotation axis.