Battery RSOC Calibration via Current Integration Feedback
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Solution Overview
Problem
Current electronic devices with rechargeable batteries lack a verification mechanism to confirm the accuracy of battery capacity estimates, leading to potential errors due to factors like temperature, aging, and load, which can affect the fully charged capacity calculation.
Innovation Solution
An electronic device with a capacity measuring unit and microprocessor that integrates battery current using a sensing resistor and calculates capacity differences to calibrate the fully charged capacity based on specific states, such as full charge or discharge, and time offline, ensuring accurate relative state-of-charge (RSOC) calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gas-gauge integrates current to calculate battery capacity, then the battery capacity can be displayed and transmitted to the system, but there is no verification mechanism to confirm the accuracy of the battery capacity estimate
Solution Approach 1:
The patent implements a feedback mechanism by comparing the gas-gauge's estimated capacity with the actual capacity measured by the capacity measuring unit. The system continuously monitors the difference between estimated and actual capacity, and uses this feedback to calibrate the gas-gauge's fully charged capacity value, thereby improving measurement accuracy over time
Solution Approach 2:
The patent introduces a capacity measuring unit as an intermediary verification mechanism. This unit independently measures actual battery capacity through voltage detection and integration, serving as a mediator to verify and calibrate the gas-gauge's estimates, thus providing the needed verification mechanism
2Ease of operation
If the fully charged capacity is used for RSOC calculation, then the RSOC can be displayed, but errors occur due to temperature, aging, and load factors affecting the fully charged capacity calculation
Solution Approach 1:
The patent dynamically adjusts the fully charged capacity parameter based on detected battery states (temperature, aging, load conditions). When the battery is in a specific state, the system calibrates the fully charged capacity by comparing estimated and actual capacity, thereby adapting the parameter to current conditions and improving RSOC calculation accuracy
Solution Approach 2:
The patent performs preliminary calibration of the fully charged capacity by detecting specific battery states (fully charged, fully discharged, or offline for predetermined period) before RSOC calculation. This preliminary action establishes an accurate baseline capacity value that accounts for temperature, aging, and load factors, ensuring subsequent RSOC calculations are precise
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
The solution provides a mechanism to accurately calibrate battery capacity, reducing errors and enabling timely detection of battery aging, temperature changes, or damage by adjusting the fully charged capacity when capacity differences exceed a predetermined threshold, thus improving battery state estimation.
Implementation Method 1
The capacity measuring unit includes a sensing resistor, measures the battery current of the battery device using the sensing resistor
Data Source
AI summary
An electronic device includes a battery device, a capacity measuring unit, and a microprocessor. The battery device outputs its remaining capacity and fully charged capacity. The capacity measuring unit includes a sensing resistor, measures the battery current of the battery device using the sensing resistor, and integrates the battery current to obtain the actual capacity. The microprocessor stores the fully charged capacity. When the battery device is in a specific state, the microprocessor calculates the capacity difference between the remaining capacity and the actual capacity. The microprocessor calibrates the fully charged capacity according to the ratio of the capacity difference to the remaining capacity.