Battery Pack Charge-Blocking Unit for Overcharge Protection
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Solution Overview
Problem
Existing battery packs for electric power tools lack effective mechanisms to inhibit overcharging, which can lead to safety issues and reduced operational effectiveness due to the absence of reliable overcharge-blocking mechanisms, especially in scenarios where high currents are involved.
Innovation Solution
A battery pack incorporating a charge-blocking unit, a voltage sensing and balancing circuit, and a microcomputer that detects abnormal conditions such as abnormal analog-to-digital conversion, voltage, and temperature, and outputs a charge control signal to inhibit charging through a fuse and switch configuration, ensuring safe operation by preventing overcharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a battery pack operates without an overcharge-blocking mechanism to maintain simplicity and reduce cost, then device complexity is reduced, but safety and reliability deteriorate due to potential overcharging issues
Solution Approach 1:
The patent introduces a charge-blocking unit as an intermediary component between the battery cell and charging terminal. This unit includes a fuse, heating resistor, and switch that physically block charge flow when abnormal conditions are detected, providing reliable overcharge protection without requiring complex continuous control mechanisms
Solution Approach 2:
The battery pack's own battery management circuitry detects abnormal conditions (voltage, temperature, current) and automatically activates the charge-blocking unit to prevent overcharging. The system monitors itself and takes corrective action without external intervention, maintaining safety while keeping the control mechanism relatively simple
2Reliability
If multiple sensing circuits and control mechanisms are added to detect abnormal conditions and prevent overcharging, then safety and reliability are improved, but device complexity increases due to additional components
Solution Approach 1:
The patent combines multiple sensing functions (voltage sensing, temperature sensing, current sensing) and the charge-blocking control into a single integrated battery management system. By merging these functions into one coordinated system rather than separate independent mechanisms, the patent achieves comprehensive overcharge protection while minimizing the increase in device complexity
Solution Approach 2:
The battery management circuitry performs multiple functions simultaneously: it monitors voltage, temperature, and current conditions, determines abnormal states, and controls the charge-blocking unit. This multi-functional approach eliminates the need for separate dedicated circuits for each monitoring and control task, reducing overall system complexity while maintaining reliable protection
Data Source
AI summary
A battery pack includes a battery cell, a charge-blocking unit, a voltage sensing and balancing circuit, and a microcomputer, the microcomputer including a controller that detects at least one selected from the group of abnormal analog-to-digital conversion, abnormal voltage, and abnormal temperature of the battery cell, the controller outputting a charge control signal to the charge-blocking unit to inhibit charging of the battery cell.