Battery Physical Self-Discharge Detection Using Pulse Current
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Solution Overview
Problem
Current self-discharge testing methods for batteries are time-consuming and difficult to implement, especially in distinguishing between physical and chemical self-discharge, requiring low-temperature storage to eliminate chemical self-discharge effects.
Innovation Solution
A method and device utilizing short-duration pulse currents with specific parameters to charge a battery and measure open-circuit voltage changes, distinguishing physical self-discharge by observing continuous voltage decline, and employing machine learning for parameter optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional self-discharge testing methods or constant-voltage direct measurement methods are used, then self-discharge current can be measured, but the testing time is long (several minutes to several hours) and it cannot quickly distinguish physical self-discharge from chemical self-discharge
Solution Approach 1:
The patent applies periodic action by using short-duration pulse currents with specific pulse widths and pulse periods to charge the battery under test. The pulse current is applied periodically rather than continuously, allowing the system to observe voltage responses during pulse intervals and rest intervals. This periodic charging approach enables rapid distinction between physical and chemical self-discharge within seconds by analyzing voltage change trends during the periodic cycles, dramatically reducing testing time from minutes/hours to seconds while maintaining detection accuracy.
2Measurement precision
If low-temperature storage is used to eliminate chemical self-discharge effects for distinction, then physical self-discharge can be identified, but the testing cost increases due to low-temperature control requirements
Solution Approach 1:
The patent applies parameter changes by utilizing the different response characteristics of physical and chemical self-discharge to pulse current parameters. Instead of changing temperature conditions, the method changes the electrical parameters (pulse width, pulse period, amplitude) of the charging current. Physical self-discharge responds differently to pulse current compared to chemical self-discharge, allowing distinction through voltage trend analysis during pulse charging. This approach eliminates the need for low-temperature storage equipment while maintaining the ability to distinguish between the two types of self-discharge.
3Measurement precision
If low-temperature storage is used to eliminate chemical self-discharge effects, then physical self-discharge can be distinguished, but the device complexity increases due to temperature control requirements
Solution Approach 1:
The patent applies the taking out principle by extracting and utilizing only the essential electrical response characteristics of the battery to distinguish physical self-discharge. Instead of requiring a complex temperature control system to eliminate chemical self-discharge effects, the method extracts the voltage response information during pulse current charging and analyzes the voltage change trends. This extraction approach isolates the detection function from the temperature control function, eliminating the need for complex thermal management equipment while maintaining distinction accuracy.
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
Enables rapid detection of physical self-discharge without low-temperature storage, reducing testing time and cost while improving accuracy through frequency response differentiation.
Implementation Method 1
outputting a corresponding short-duration pulse current to charge a battery under test according to preconfigured parameters
Implementation Method 2
one is physical self-discharge, mainly caused by microscopic physical short circuits and weakly correlated with temperature
Data Source
AI summary
A method, device, and medium for battery physical self-discharge detection are provided. Related to the field of battery monitoring technology and used to detect whether a battery has physical self-discharge, the present disclosure addresses issues of long testing time and difficulty in implementation with current self-discharge detection practice, provides a battery physical self-discharge testing method, leverages frequency response characteristics of battery physical self-discharge and chemical self-discharge to perform self-discharge detection, and rapidly screens whether the battery has physical self-discharge by monitoring a battery voltage change trend. The testing time is short for determining whether a battery has physical self-discharge. It does not need low-temperature storage, reduces implementation difficulty and cost, and better meets requirements of practical battery self-discharge testing scenarios.