Battery Swapping SoC Balancing for Accurate Impedance Checks
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Solution Overview
Problem
Existing battery swapping systems lack efficiency in managing state of charge (SoC) and impedance measurement, leading to inefficiencies in battery replacement and power utilization.
Innovation Solution
A battery swapping system with a main controller that adjusts SoC and an impedance measurement device to ensure accurate battery swapping, including a supplemental battery pack for power management and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a battery swapping system manually matches SoC of battery packs to target SoC, then users can control battery charging, but users consume time and effort, and power efficiency is reduced
Solution Approach 1:
The battery swapping system automatically monitors the SoC of battery packs and autonomously charges or discharges them to match the target SoC without requiring user intervention. The system uses controllers to manage the charging/discharging process between battery packs, enabling self-service operation that eliminates manual user involvement while maintaining optimal battery state management
Solution Approach 2:
The system performs preliminary charging or discharging of battery packs before they are needed for swapping operations. By proactively adjusting the SoC of battery packs in advance using other battery packs as power sources, the system ensures that battery packs are ready at the target SoC level, eliminating the need for users to wait or manually manage charging at the point of use
2Device complexity
If surplus power from battery packs is not stored, then the system is simpler, but power efficiency is reduced due to power waste
Solution Approach 1:
Instead of discarding surplus power from battery packs with high SoC, the system recovers this excess energy by transferring it to other battery packs that need charging. The controller manages the power flow to move surplus energy from one battery pack to another, effectively recovering what would otherwise be wasted power and improving overall system energy efficiency
Solution Approach 2:
The system merges the power management functions of multiple battery packs into a unified system where surplus power from one pack is combined with the charging needs of another. This integration allows the system to treat the battery packs as an interconnected energy network, eliminating waste by combining excess power supply with power demand within the same system
3Productivity
If impedance measurement is not performed at the correct SoC, then the process is faster, but measurement accuracy is reduced
Solution Approach 1:
The system performs preliminary adjustments to bring the battery pack SoC close to the target level before impedance measurement is performed. By pre-conditioning the battery pack through controlled charging or discharging operations, the system ensures that the impedance measurement is taken at the optimal SoC state, guaranteeing measurement accuracy without significantly delaying the overall swapping process
Solution Approach 2:
The system continuously monitors the SoC of battery packs and uses this feedback information to determine when impedance measurement should be performed. The controller adjusts the timing of impedance measurements based on real-time SoC data, ensuring measurements are taken at the correct moment when the battery pack reaches the target SoC level, thereby maintaining measurement precision while optimizing process speed
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 system autonomously sets SoC to a target level, optimizing battery swapping and power utilization, reducing waste and improving efficiency by storing surplus power for future use.
Implementation Method 1
electrochemical impedance spectroscopy may be used. The electrochemical impedance spectroscopy may quickly and accurately detect impedance which is a factor hindering electricity transmission when a chemical reaction occurs at an electrode included in the battery
Implementation Method 2
a supplemental battery pack configured to receive and store power from the subject battery pack
Data Source
AI summary
Discussed is a battery swapping system that includes a main controller configured to obtain a subject state of charge (SoC) of a subject battery pack and compare the subject SoC with a target SoC, a supplemental battery pack configured to receive and store power from the subject battery pack when the subject SoC exceeds the target SoC, and an impedance measurement device configured to measure an impedance of the subject battery pack when the subject SoC is approximately equal to the target SoC.