Large-Cylindrical LFP Battery Pack for High-Output Outdoor Tools
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Solution Overview
Problem
Cordless power tools require battery packs with higher output characteristics, such as increased power, capacity, and charging/discharging rates to match the performance of engine tools, which existing battery technologies struggle to achieve effectively.
Innovation Solution
A battery pack design featuring a housing with a cell module comprising cylindrical lithium iron phosphate cells, a bracket with a support and guide structure, and connection pole pieces, optimized for high capacity and weight efficiency, with a terminal assembly for secure electrical connection, and a handle for user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery pack uses larger diameter cells (≥3 cm) to increase capacity and power output, then the power and capacity meet the requirements for outdoor moving devices, but the battery pack weight increases (≥9 kg)
Solution Approach 1:
The patent changes the physical parameters of the battery cells by specifying a minimum diameter of 3 cm and a length-to-width ratio of at least 0.7, which optimizes the power-to-weight ratio for outdoor moving device applications
Solution Approach 2:
The patent employs lithium iron phosphate cells which utilize composite material structures to achieve high capacity and power output while managing the weight constraint through advanced material composition
2Quantity of substance
If battery pack uses larger diameter cells (≥3 cm) to increase capacity, then the capacity meets the requirements (≥20 Ah), but the battery pack dimensions increase
Solution Approach 1:
The patent specifies precise dimensional parameters for the cells (diameter ≥3 cm, length-to-width ratio ≥0.7) to optimize the capacity-to-volume ratio, ensuring high capacity while controlling the overall battery pack dimensions for practical applications
3Power
If battery pack uses high discharging current capability (≥30 A) to match engine tool performance, then the power output is sufficient, but the thermal management and safety challenges increase
Solution Approach 1:
The patent selects lithium iron phosphate chemistry and specifies cell dimensional parameters that inherently provide better thermal stability and safety characteristics, enabling high discharging current (≥30 A) while managing thermal challenges through material selection rather than additional cooling systems
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 battery pack provides a high-capacity, high-discharge current solution that meets the power requirements of outdoor moving devices and other electric tools, offering improved performance and usability while maintaining a robust and efficient design.
Implementation Method 1
a cell module mounted in the housing and comprising a plurality of cells. Each one of the plurality of cells is cylindrical and a diameter of the each one of the plurality of cells is greater than or equal to 3 cm
Implementation Method 2
the plurality of cells are lithium iron phosphate cells
Implementation Method 3
each one of the plurality of connection pole pieces is connected to at least two ones of the plurality of cells, the each one of the plurality of connection pole pieces is connected to the at least two ones of the plurality of cells through welding
Data Source
AI summary
A battery pack for powering an outdoor moving includes: a housing mounted to the outdoor moving device and supported by the outdoor moving device; and a cell module mounted to the housing and including multiple cells. A cell is cylindrical and the diameter of the cell is greater than or equal to 3 cm.