Multi-Voltage Battery Pack Switching for Mixed-Voltage Power Tools
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Solution Overview
Problem
Conventional battery packs typically output a single or dual voltage, making them inadequate for power tools with different rated voltages, necessitating a solution that can provide multiple voltage outputs to accommodate various tools.
Innovation Solution
An electric energy storage device with a housing containing N battery units, switches, and a control unit that connects the units in parallel or series to output at least three different voltages, utilizing a micro control unit and driver to manage the switches and achieve the required voltage configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a battery pack outputs a single or dual voltage, then the device complexity is low, but the adaptability to different power tools is insufficient
Solution Approach 1:
The battery pack employs dynamic voltage switching capability through control units that can change the output voltage configuration in real-time based on the power tool's requirements. The system transitions from a static single-voltage design to a dynamic multi-voltage system, enabling the same battery pack to adapt to different voltage requirements (18V, 36V, 54V, 72V) by reconfiguring the connection of multiple battery units through switches and control circuits.
Solution Approach 2:
The invention changes the electrical parameter (output voltage) of the battery pack by altering the connection configuration of internal battery units. By using switches to reconfigure battery units in series or parallel arrangements, the system can output different voltages (18V, 36V, 54V, 72V) from the same physical battery pack, thereby achieving multi-voltage adaptability without requiring multiple separate battery packs.
2Adaptability or versatility
If multiple battery packs with different voltages are used, then the adaptability to different power tools is improved, but the loss of time for changing battery packs increases
Solution Approach 1:
The battery pack is designed with multi-functionality to serve multiple voltage requirements (18V, 36V, 54V, 72V) from a single device. The control unit detects the power tool's voltage requirement and automatically configures the appropriate connection mode of battery units, enabling one battery pack to replace multiple single-voltage battery packs and eliminate the need for manual battery pack changes.
Solution Approach 2:
The system performs preliminary configuration of battery unit connections based on pre-determined voltage requirements. The control unit is pre-programmed with switching logic to automatically configure the appropriate series or parallel connection mode before power delivery, ensuring rapid voltage adaptation without requiring manual intervention or time-consuming battery pack changes.
3Adaptability or versatility
If switches and control units are added to enable multi-voltage output, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The battery pack is segmented into multiple independent battery units (first battery unit, second battery unit, third battery unit, fourth battery unit) that can be independently connected through switches. This segmentation allows flexible reconfiguration of the battery system to achieve different voltage outputs (18V, 36V, 54V, 72V) while maintaining modular architecture that simplifies control and reduces overall system complexity.
Data Source
AI summary
An electric energy storage device, the electric energy storage device configured to be detachably coupled with an electrical device, the electric energy storage device comprises a housing, N sets of battery units received in the housing, N being a composite number, each battery unit comprising at least one battery cell, a plurality of switches, each switch connected to the output end of two different battery units, a control unit electrically connected to the switches and configured to control the switches to switch on or off in order to connect the battery units in parallel or series, wherein the electric energy storage device can output at least three different voltages. The electric energy storage device can be used for different types of power tools with different voltage requirements.