Vehicle Battery Deterioration Detection Using Voltage and Control Frequency

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Solution Overview

Problem

Existing methods for determining battery deterioration in vehicles are inaccurate due to factors like state of charge (SOC) and temperature fluctuations, and implementing physical models or AI increases the load of advance preparation.

Innovation Solution

A determination device and method that utilize the frequency of vehicle control prohibition and battery voltage thresholds to assess battery deterioration, avoiding the need for advance preparation and improving accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If rule-based determination using battery voltage is used, then the determination process is simple, but the accuracy of battery deterioration determination is poor

Engineering Contradiction:

Improvedetermination process complexityVSAvoidbattery deterioration determination accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The invention changes the determination parameters from simple voltage threshold checking to a combination of voltage values and frequency of control prohibition. By introducing frequency as an additional parameter and combining it with voltage information, the system achieves more accurate battery deterioration determination while maintaining computational simplicity.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If physical model or AI is used to improve determination accuracy, then the accuracy of battery deterioration determination is improved, but the load of advance preparation such as parameter decision is generated

Engineering Contradiction:

Improvebattery deterioration determination accuracyVSAvoidadvance preparation load

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The invention extracts only the essential features needed for accurate determination: voltage values and frequency of control prohibition. By taking out only these critical parameters from the complex system, the invention achieves high determination accuracy without requiring extensive parameter calibration or advance preparation associated with physical models or AI approaches.

Inventive Principle:

Principle #2Taking out (Extraction)

3Device complexity

If only battery voltage is used for determination, then the determination process is simple, but factors like SOC decrease and temperature decrease cannot be distinguished from battery deterioration

Engineering Contradiction:

Improvedetermination process complexityVSAvoiddifferential diagnosis capability

Core Design Contradiction:

Device complexityVSLoss of information

Solution Approach 1:

The invention uses feedback from the control prohibition frequency, which reflects the cumulative effect of voltage drops below the first threshold. This feedback mechanism provides information about the pattern and persistence of voltage issues, enabling differentiation between temporary causes (SOC decrease, temperature decrease) and permanent battery deterioration.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12529733B2Determination device, determination method, and determination program

Publication Date: 2026.01.20 TOYOTA JIDOSHA KK

AI summary

A determination device includes an acquisition unit configured to acquire information on a state of a battery mounted on a vehicle, the information including information on a voltage value of the battery, and a determination unit configured to determine that the battery is deteriorated based on the information acquired by the acquisition unit, in a case where a frequency of prohibition of control of the vehicle using the battery exceeds a predetermined first threshold value and a voltage of the battery falls below a predetermined second threshold value.