Battery Degradation Calculation via Voltage Segmentation

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Solution Overview

Problem

Existing battery degradation measurement methods for eco-friendly vehicles are inadequate, as they fail to accurately determine capacity degradation due to increased internal resistance, are limited by specific temperature conditions, and are sensitive to sensor errors, especially when measuring batteries in vehicles.

Innovation Solution

An apparatus and method that calculate battery degradation by analyzing voltage change rates and characteristics based on temperature, dividing behavior information into sections to determine charging capacity and degradation degrees, and outputting the final degradation as a combination of characters, voices, and graphics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If internal resistance measurement method is used to determine battery degradation, then degradation state can be determined, but it cannot accurately determine capacity degradation due to increased internal resistance and is inappropriate for eco-friendly vehicles

Engineering Contradiction:

Improvebattery degradation measurement accuracyVSAvoidcapacity degradation determination reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent changes the measurement parameters from internal resistance to voltage characteristics under specific temperature and charging conditions. By measuring voltage at different states of charge and temperatures, the system calculates capacity degradation without relying on internal resistance measurements, thus resolving the contradiction between measurement feasibility and capacity degradation accuracy.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces voltage characteristics as an intermediary parameter to indirectly determine capacity degradation. Instead of directly measuring capacity or using internal resistance, the system uses voltage measurements under controlled conditions as a mediator to calculate degradation, making the measurement both feasible and accurate for mounted batteries.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If battery degradation is measured under specific temperature conditions with constant current charging, then calculation can be performed, but the calculation is limited and does not reflect voltage characteristics based on temperature change

Engineering Contradiction:

Improvecalculation implementation simplicityVSAvoidtemperature condition adaptability

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent segments the temperature range into multiple specific temperature conditions (e.g., 10°C, 20°C, 30°C, 40°C, 50°C) and performs separate voltage measurements at each temperature. This segmentation allows the system to capture temperature-dependent voltage characteristics while maintaining simple constant current charging procedures at each temperature point.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent makes the measurement system dynamic by adapting the voltage measurement process to different temperature conditions. The system dynamically selects appropriate temperature points and adjusts measurement parameters based on actual operating conditions, enabling versatile temperature adaptability while maintaining implementation simplicity through standardized measurement protocols.

Inventive Principle:

Principle #15Dynamics

3Productivity

If current integrated quantities are compared in specific voltage region, then degradation calculation can be made, but calculation accuracy sensitively reacts to sensor errors during current integration

Engineering Contradiction:

Improvedegradation calculation efficiencyVSAvoidcalculation accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent replaces the mechanical integration of current measurements with a voltage-based calculation method. Instead of integrating current over time and comparing quantities, the system uses voltage measurements at different states of charge to calculate capacity degradation, thereby eliminating sensitivity to current sensor errors and integration inaccuracies.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent creates a voltage-based copy of the capacity measurement process. Rather than directly measuring and integrating current to determine capacity, the system uses voltage characteristics as a proxy or copy that reflects capacity information, providing an alternative measurement path that is less sensitive to sensor errors.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS10330737B2Apparatus and method for calculating degradation degree

Publication Date: 2019.06.25 HYUNDAI MOTOR CO LTD

AI summary

An apparatus for calculating a degradation degree is provided and includes a battery and a measurer that senses the battery to generate behavior information. The apparatus further includes a calculator that divides the behavior information into a plurality of sections and calculates a behavior change quantity in each section and/or charging capacity in each section of the behavior information in each section. The calculator uses the behavior change quantity in each section and the charging capacity in each section to determine the degradation degrees of the battery in each section, and use the degradation degrees of the battery within each section to generate a final degradation degree of the battery.