Low-Voltage Battery Functional Reliability Test via Voltage Profile Correlation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods inadequately determine the functional reliability of low-voltage batteries in vehicles, particularly in scenarios where high load currents are required, such as emergency operations, and fail to ensure the battery can maintain a temperature-independent voltage level during load scenarios.
Innovation Solution
A method involving a test pulse with a current intensity less than that of an emergency pulse, where the battery's voltage curve is correlated with predetermined criteria to ensure it meets functional requirements, including maintaining a voltage level, gradient, and difference, to guarantee reliability without falling below a lower voltage limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a test pulse with current intensity comparable to emergency pulses is applied to the battery, then the functional reliability under high load can be accurately assessed, but the battery voltage drops significantly and the test cannot be performed without affecting normal operation
Solution Approach 1:
The patent changes the parameter of test pulse current intensity from emergency-level high current to a reduced, controlled current level. This allows the test to be performed without causing significant voltage drops that would affect normal vehicle operation, while still providing meaningful functional reliability assessment through the correlation method
Solution Approach 2:
The patent introduces an intermediary correlation relationship between reduced test pulse voltage curves and emergency pulse voltage curves. By establishing this correlation through multiple test runs and statistical evaluation, the system can assess emergency performance using milder test conditions that don't disrupt normal operation
2Ease of operation
If the battery is regularly monitored using standard variables (SOC, SOH) and impedance spectroscopy, then the operating state and aging can be determined, but the functional fulfillment under high load currents cannot be reliably predicted
Solution Approach 1:
The patent performs preliminary actions by conducting multiple test pulse measurements under reduced current conditions and establishing correlation data before actual emergency situations occur. This preliminary characterization allows the system to predict emergency performance reliability without needing to subject the battery to actual emergency-level stress during operation
Solution Approach 2:
The patent replaces the mechanical/electrical stress approach (applying actual emergency current loads) with a statistical correlation approach. By substituting physical high-stress testing with mathematical correlation analysis of reduced-stress test data, the system can predict functional fulfillment under high load without actually applying damaging high currents
3Use of energy by moving object
If a test pulse with current intensity less than emergency pulse is used, then the battery can be tested without significant voltage drops, but the test must be correlated with predetermined criteria to ensure functional reliability
Solution Approach 1:
The patent segments the evaluation process into distinct components: voltage curve acquisition during test pulse, correlation relationship establishment from multiple tests, statistical parameter calculation, and predetermined criterion comparison. This segmentation makes the complex evaluation manageable and systematic
Solution Approach 2:
The patent implements feedback by using results from multiple test runs to refine and establish the correlation relationship between reduced test pulse responses and emergency pulse performance. The statistical evaluation of voltage curves from repeated tests provides feedback that enables accurate prediction criteria to be developed
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 a straightforward assessment of battery reliability for meeting load scenarios without voltage drops, ensuring the battery can support safety-relevant systems during emergencies, with criteria adjusted for temperature ranges and energy efficiency through DC/DC converter usage.
Implementation Method 1
a low-voltage battery (LV battery) of an at least partially electrically powered vehicle, which is loaded with a test pulse
Implementation Method 2
with criteria adjusted for temperature ranges and energy efficiency through DC/DC converter usage
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention relates to a method for determining the functional reliability of a battery, in particular a low voltage battery (LV battery) of an at least partially electrically driven vehicle, to which a test pulse is applied. In order to propose a method allowing a function verification by simple means, which function verification demonstrates that the battery fulfills a specifiable load scenario, without falling short of a temperature-independent lower voltage limit, according to the invention, the functional reliability of the battery results from a correlation of the voltage profile on the battery, resulting during the test pulse, together with a specified function request, wherein there is functional reliability if the voltage profile of the battery meets a plurality of independent test criteria during the test pulse.