Back-Mounted Power Tool Battery Layout for Weight and Runtime
Find Innovative SolutionsGenerate Solutions
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 boost voltage, and limited flexibility and convenience due to fixed battery configurations and compatibility issues.
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 force of the power tool across the user's body, enabling rotation and adjustable positioning for improved ergonomics and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the voltage of the battery is increased to improve power supply, then the power and efficiency of the power tool system increase, but the weight and size of the battery increase
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 or tool, distributing the weight and allowing flexible configuration based on power needs.
Solution Approach 2:
The battery configuration transitions from a single-dimensional (one battery pack) to multi-dimensional arrangement where multiple battery packs can be stacked or arranged in series/parallel configurations. This allows voltage and capacity to be increased by adding batteries in different spatial arrangements rather than enlarging a single battery.
2Power
If the number of battery cells is increased to achieve high voltage, then the power supplied to the motor increases, but the overall weight and size of the battery increase
Solution Approach 1:
The battery system uses multiple separate battery packs instead of one large battery pack with increased volume. Each pack maintains a manageable size, and when multiple packs are combined for higher voltage operation, the total volume is distributed across separate units rather than concentrated in one large unit.
3Reliability
If the battery is fixed as part of the system to ensure stable power supply, then the reliability improves, but the flexibility and convenience for operating the power tool are reduced
Solution Approach 1:
The battery system transitions from a fixed configuration to a dynamic, reconfigurable system. Battery packs can be attached and detached from the backpack or directly from the power tool, allowing users to adjust the configuration based on task requirements. The system can operate with one or multiple battery packs depending on power needs and runtime requirements.
Solution Approach 2:
The battery packs are designed with universal compatibility across different power tool applications. The same battery pack design can be used in various tools and configurations (single pack, dual packs in series or parallel), making the system adaptable to different power and runtime requirements without requiring tool-specific battery designs.
4Reliability
If the battery package is specially made for a particular type of power tool to ensure compatibility, then the reliability of power supply improves, but the application of the system is limited to particular applications
Solution Approach 1:
The battery packs use standardized connectors and voltage specifications that enable them to be used across multiple power tool types and brands. The universal design allows a single battery pack model to serve multiple functions in different tools (e.g., blowers, trimers, edgers) and can be combined in various configurations to meet different power requirements.
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.