Battery RSOC Reporting with Temperature Compensation
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Solution Overview
Problem
Temperature variations affect the accuracy of battery capacity measurements, leading to inaccurate reporting of the relative state of charge (RSOC) in battery-operated devices, as capacity changes with temperature, causing confusion for users.
Innovation Solution
A battery monitoring system that includes a temperature sensor, a fuel gauge system, and a processing unit to adjust the reported RSOC based on temperature and charging conditions, suspending updates when temperature changes occur and resuming when conditions stabilize, ensuring accurate RSOC reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RSOC is computed based on capacity value without temperature compensation, then the computation is simple, but the RSOC reporting accuracy deteriorates due to temperature effects
Solution Approach 1:
The system changes the parameter used for RSOC computation from fixed capacity value to temperature-compensated capacity value. The fuel gauge system retrieves temperature data, determines corresponding capacity values from lookup tables at different temperatures, and uses these adjusted values for RSOC computation, thereby improving accuracy while maintaining computational efficiency
Solution Approach 2:
The patent introduces temperature data and capacity value lookup tables as intermediary elements between the actual battery state and the RSOC computation. The fuel gauge system acts as an intermediary that processes temperature information and translates it into corrected capacity values, which then feed into the RSOC calculation, improving measurement precision without significantly increasing system complexity
2Measurement precision
If RSOC is continuously updated regardless of temperature changes, then the reporting is frequent, but the accuracy deteriorates during temperature transitions
Solution Approach 1:
The system dynamically adjusts the RSOC update behavior based on temperature conditions. When temperature changes are detected, the system suspends RSOC updates to prevent inaccurate reporting during capacity transitions. Once temperature stabilizes, the system resumes normal update operations, creating a dynamic update strategy that adapts to thermal conditions
Solution Approach 2:
The system takes preliminary action by detecting temperature changes before they significantly affect capacity measurements. Upon detecting a temperature change, the system proactively suspends RSOC updates to prevent the propagation of inaccurate data, rather than waiting for errors to manifest in the reported values
Data Source
AI summary
Various embodiments of the present technology may comprise methods and apparatus to determine an RSOC value of a battery. The methods and apparatus may comprise utilizing various parameters, such as voltage, current, and/or temperature to calculate the RSOC of the battery. In various embodiments, the methods and apparatus may display one of an actual RSOC and a reported RSOC. In various embodiments, the methods and apparatus may further detect changes in the relevant parameter(s), adjust the reported RSOC of the battery accordingly, and report the adjusted RSOC.