Battery SOC Determination Using Voltage and Power Parameters
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Solution Overview
Problem
Existing methods for determining battery state of charge (SOC) in terminal apparatuses, such as mobile phones and tablets, face accuracy issues due to cumulative detection errors in coulometer methods and large voltage fluctuations in voltage detection methods, requiring complex correction circuits and algorithms.
Innovation Solution
A method and device that determine battery SOC by calculating a basic SOC based on current voltage, and adjusting it using rated and maximum power consumption parameters, along with actual SOC at a reference time, to ensure accuracy and cycle detection, incorporating a voltage-charge amount corresponding relationship and charging status updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If voltage detection method is used to determine battery SOC, then detection speed is fast, but measurement precision deteriorates due to large voltage fluctuations
Solution Approach 1:
The patent uses feedback by continuously monitoring voltage fluctuations and comparing them against expected ranges. When voltage deviation exceeds the threshold, the system triggers a correction mechanism that adjusts the SOC calculation, thereby maintaining precision while preserving the fast response of voltage detection.
Solution Approach 2:
The patent dynamically changes the parameter used for SOC calculation based on voltage stability. When voltage is stable, it uses voltage-based SOC; when voltage fluctuates significantly, it switches to or corrects with coulometer-based SOC, thus adapting to different operating conditions to maintain both speed and precision.
2Measurement precision
If coulometer method is used to determine battery SOC, then measurement precision is improved, but device complexity increases due to cumulative detection errors requiring correction circuits
Solution Approach 1:
The patent implements feedback by monitoring voltage deviations and using them to correct cumulative errors in the coulometer method. Instead of complex hardware correction circuits, it uses a feedback algorithm that adjusts the SOC calculation when voltage deviation exceeds a threshold, simplifying the device while maintaining precision.
Solution Approach 2:
The patent introduces voltage deviation as an intermediary parameter that mediates between the coulometer method and voltage detection method. This intermediary triggers correction only when necessary, avoiding the need for continuously complex correction circuits while maintaining measurement precision.
3Measurement precision
If complex correction algorithms are used to improve SOC accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies partial correction rather than continuous complex algorithms. It only activates correction when voltage deviation exceeds a predefined threshold, using a simple conditional check and basic adjustment calculation instead of continuously running complex algorithms, thus improving precision without significantly increasing device complexity.
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
This approach enhances SOC detection accuracy by correcting deviations and providing a reliable, cycle-based SOC determination, reducing the need for complex correction circuits and algorithms, and stabilizing charge amount calculations.
Implementation Method 1
a battery is an indispensable part of a terminal apparatus, such as a mobile phone, a tablet computer, and the like, to provide power for operation of the apparatus
Implementation Method 2
detecting a voltage of the battery of the terminal apparatus at the current time; and determining the basic SOC at the current time based on the voltage of the battery at the current time
Data Source
AI summary
A method for determining a battery state of charge (SOC) includes: determining a basic SOC of a battery of a terminal apparatus at a current time; determining rated and maximum power consumption parameters of the terminal apparatus in a time period between the current time and a reference time previous thereto; determining a reference SOC at the current time based on the rated power consumption parameter and an actual SOC at the reference time; determining a minimum SOC at the current time based on the maximum power consumption parameter and the actual SOC at the reference time; and judging whether the basic SOC is between the minimum SOC and the actual SOC at the reference time or not, and if yes, determining the basic SOC as an actual SOC at the current time, and if not, determining the actual SOC at the current time based on the reference and basic SOC.