Battery Leakage Current Detection via Voltage Drop Measurement
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Solution Overview
Problem
Current battery safety monitoring systems do not effectively check for leakage currents, which can lead to battery faults such as overheating or fire, despite existing methods for detecting overcharge, over-discharge, and temperature issues.
Innovation Solution
A method and apparatus that determine a battery's leakage current by measuring the voltage drop between its electrodes over time, comparing it to a preset threshold, and prompting the user or sending data to a server if the leakage current is excessive, ensuring uninterrupted power supply and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional battery monitoring methods (detecting charging/discharging voltage and current) are used, then overcharge, over-discharge, and over-temperature can be detected, but leakage current inside the battery cannot be properly detected
Solution Approach 1:
The patent introduces an intermediary measurement approach by measuring voltage at two different time points (V1 at time T1 and V2 at time T2) and using the voltage difference over time to indirectly detect leakage current. This mediator method allows leakage current detection without directly measuring the difficult-to-detect leakage current itself.
Solution Approach 2:
The battery itself provides the measurement signal by maintaining its own charge state, allowing the system to use the battery's own voltage characteristics over time to detect its own leakage current, eliminating the need for external test equipment.
2Reliability
If the battery continuously supplies power to the electronic device, then uninterrupted power supply is maintained, but leakage current cannot be detected
Solution Approach 1:
The system performs periodic leakage current detection by temporarily switching off the battery's power supply at specific intervals (when voltage threshold is met or at predetermined times) to measure voltage change over time. This periodic interruption allows detection while maintaining overall power supply continuity for the device.
Solution Approach 2:
The system checks predetermined conditions (voltage threshold, time duration, power adapter connection status) before initiating leakage current detection, ensuring that detection only occurs when safe and appropriate, thereby maintaining power supply continuity under normal operating conditions.
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
Effectively detects and prevents battery faults by identifying high leakage currents, ensuring user safety and enabling manufacturers to collect fault data for performance improvement.
Implementation Method 1
a voltage parameter, which is a difference between voltages of the battery at two different time moments
Data Source
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AI summary
Embodiments of this application disclose a battery leakage current check method, apparatus, and circuit, and relate to the battery field, so as to check for a leakage current inside a battery. The battery leakage current check method includes: when a power adapter supplies power to an electronic device, controlling the battery to stop supplying power to the electronic device; obtaining a voltage parameter and a duration parameter, where the voltage parameter is a difference between voltages of the battery at two different moments, and the duration parameter is duration between the two different moments; and determining, based on the voltage parameter and the duration parameter, whether a leakage parameter of the battery meets a preset condition. The embodiments of this application are applied to battery leakage current check.