Dual-Voltage Battery Pack Terminal Layout for Electric Tools
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Solution Overview
Problem
Existing battery packs require multiple units to accommodate different voltage requirements for various electric tools, increasing user burden and costs, as they lack the ability to efficiently output multiple voltages without step-up/step-down conversion circuits.
Innovation Solution
A battery pack design with two battery cell groups, each with matching positive and negative terminals, connected via six external terminals that allow series or parallel configuration without an electronic conversion circuit, enabling the output of two voltages by changing input/output connections, thereby meeting diverse voltage needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a battery pack uses a single voltage platform, then the device complexity is reduced, but the adaptability to different electric tools is limited
Solution Approach 1:
The battery pack is divided into two separate battery cell groups (first and second groups), each capable of independent connection to the external terminals. This segmentation allows the battery pack to output different voltages by selectively connecting different groups to the terminals, thereby achieving adaptability to different voltage requirements without increasing overall system complexity
Solution Approach 2:
The battery pack is designed with universal six external terminals that can accommodate different connection configurations. By providing multiple connection paths and terminal options, the battery pack can serve multiple voltage platform requirements (18V, 36V, etc.) with a single device design, enhancing versatility without requiring multiple specialized battery packs
2Adaptability or versatility
If multiple battery packs are prepared for different voltages, then the adaptability to different electric tools is improved, but the quantity of components increases
Solution Approach 1:
Multiple battery cell groups that would traditionally require separate battery packs are merged into a single integrated battery pack design. The first and second battery cell groups share common external terminals and housing, allowing users to have one battery pack instead of multiple separate packs, thereby reducing the quantity of components while maintaining voltage platform compatibility
3Adaptability or versatility
If step-up/step-down voltage conversion circuits are used, then the adaptability to different voltages is improved, but the device complexity and costs increase
Solution Approach 1:
The complex step-up/step-down voltage conversion circuits are extracted and removed from the battery pack design. Instead of using electronic conversion, the patent achieves voltage adaptation through direct selective connection of different battery cell groups to external terminals, significantly reducing circuit complexity while maintaining voltage output flexibility
Solution Approach 2:
Electronic voltage conversion systems are replaced with a mechanical/connection-based system. By using physical connection paths and terminal switching rather than electronic conversion circuits, the patent achieves voltage adaptation through structural configuration rather than complex electronic control, thereby reducing device complexity
Data Source
AI summary
The present disclosure provides a battery pack, an electric tool, and a charging device. The battery pack comprising a housing having a connecting portion configured to match and connect to a tool or a charging device, wherein the connecting portion comprises a first connecting terminal, a second connecting terminal, a third connecting terminal, a fourth connecting terminal, a fifth connecting terminal, and a sixth connecting terminal; a first battery cell group and a second battery cell group are disposed in the housing, and a quantity of battery cells electrically connected in series in the first battery cell group is equal to a quantity of battery cells electrically connected in series in the second battery cell group; wherein the first battery cell group has a first positive terminal and a first negative terminal, and the second battery cell group has a second positive terminal and a second negative terminal; wherein the first positive terminal, the first negative terminal, the second positive terminal and the second negative terminal match and correspondingly connect to the second connecting terminal to the fifth connecting terminal, respectively; wherein the sixth connecting terminal functioning as a signal terminal is electrically connected to a control module disposed in the housing; and wherein the first connecting terminal functioning as a charging terminal is electrically connected to a first end of a switch, a second end of the switch is electrically connected to the first positive terminal, and a third end of the switch is electrically connected to the control module. The battery pack can externally output two voltages by changing input/output connection lines matching the six connecting terminals.