Parallel Battery SOC Estimation With Separate Battery Models
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Solution Overview
Problem
Existing methods for calculating the state of charge (SOC) of batteries in electronic devices with multiple connected batteries are inaccurate, especially as batteries age, and often require complex calculations and high power consumption.
Innovation Solution
A battery status calculating system that uses a first electronic device to manage one battery and a second electronic device to manage another battery connected in parallel, employing different battery-modeling schemes to accurately calculate the SOC of each battery and integrate them into a single SOC value, reducing complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ECT modeling scheme is used to calculate battery SOC, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The battery pack is divided into multiple individual batteries, each managed by separate electronic devices. Each device calculates SOC for its own battery using simplified methods, then results are aggregated. This segments the complex ECT calculation into smaller, manageable units that can use less complex algorithms.
Solution Approach 2:
The patent introduces an intermediary approach where basic SOC values are calculated using simpler methods first, then these intermediate results are combined and adjusted to achieve the final accurate SOC. This avoids direct complex ECT calculations while maintaining accuracy through staged processing.
2Measurement precision
If ECT modeling scheme is used to calculate battery SOC, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The power consumption burden is segmented across multiple electronic devices, each handling only a portion of the total calculation load. This distribution reduces the energy each individual device must consume compared to a single device performing all ECT calculations.
Solution Approach 2:
The patent employs simpler, less energy-intensive calculation methods that may have lower individual accuracy but when combined provide sufficient overall accuracy. These simpler methods consume less power and are used as the primary calculation approach.
3Device complexity
If current integration scheme is used to calculate battery SOC, then device complexity is reduced, but measurement precision deteriorates as battery ages
Solution Approach 1:
The patent merges multiple simple SOC calculation results from different batteries into a comprehensive SOC value. By combining these simpler calculations with additional adjustment factors and multiple measurement points, the system achieves higher overall accuracy while maintaining relative simplicity in individual calculation units.
Solution Approach 2:
The system incorporates feedback mechanisms where SOC calculations are continuously refined based on actual battery performance data, temperature readings, and usage patterns. This feedback loop compensates for the limitations of simpler calculation methods and maintains accuracy as batteries age.
Data Source
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AI summary
A battery status calculating system includes a first electronic device including a first sensor for sensing first information including voltage, current, and temperature of a first battery of a battery pack; and a first controller including a processor and a memory storing instructions, wherein the instructions are executed to cause the processor to receive second information including voltage, current, and temperature of a second battery of the battery pack, wherein the second battery is connected in parallel with the first battery, obtain a first State Of Charge (SOC) and a first State Of Health (SOH) of the first battery based on the first information by a battery-modeling, obtain a second SOC and a second SOH of the second battery based on the second information using the battery-modeling; and calculate a SOC of the battery pack based on the first SOC, the first SOH, the second SOC, and the second SOH.