Multi-Voltage Battery Pack Switching for Electric Tools
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Solution Overview
Problem
Existing electric tools require different voltage battery packs, leading to high costs and resource wastage due to the need for multiple battery pack types to accommodate tools with varying rated voltages.
Innovation Solution
An electric energy storage device with four energy units of the same rated voltage, divided into two energy modules, allowing for output voltages of three kinds through parallel and series connections, and a socket with control parts to manage these connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different battery packs are prepared for electric tools with different rated voltages, then each battery pack can provide the correct voltage for its corresponding tool, but the cost increases and resources are wasted
Solution Approach 1:
The patent implements a universal battery pack design that can provide multiple voltage outputs (18V, 36V, 54V) through a single pack by using series-parallel switching of four energy units. This allows one battery pack to replace multiple voltage-specific packs, enabling compatibility across different tool voltage platforms while maintaining reliable voltage matching through controlled connection configurations.
Solution Approach 2:
The patent employs dynamic switching mechanisms (parallel switches and series switches) that can reconfigure the connection state of energy units between parallel and series configurations. This dynamic reconfiguration allows the battery pack to adapt its output voltage based on the tool's requirements, transforming a static voltage output system into a flexible, multi-voltage system.
2Adaptability or versatility
If a single battery pack with multiple voltage outputs is designed, then adaptability to different tool voltages improves and costs reduce, but device complexity increases due to multiple switches and control parts
Solution Approach 1:
The patent divides the battery pack into four discrete energy units organized in two modules, each with independent parallel and series switching capability. This segmentation allows flexible reconfiguration without requiring a completely complex global switching system, as each module can be controlled independently to achieve the desired voltage output.
Solution Approach 2:
The patent combines multiple switching functions (parallel switching and series switching) into an integrated control system within the socket, where control parts manage both types of switches simultaneously. This merging of control functions reduces the overall system complexity compared to having separate independent control systems for each switching type.
Data Source
AI summary
An electric energy storage device comprises four energy units with a same rated voltage and a socket. The four energy units are divided into two energy modules, each energy module is provided with two energy units, and each energy module is provided with a positive electrode and a negative electrode. The socket including four voltage output terminals respectively connected to the positive and negative electrodes of the two energy modules, and the socket is also provided with two control parts which respectively control the two energy units in the two corresponding energy modules to switch between parallel state and series state.