Swappable Battery Charging Delay for High-Rate Degradation
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Solution Overview
Problem
Existing battery swap systems do not adequately address the issue of battery degradation during charging, particularly due to high-rate degradation caused by uneven lithium-ion concentration distribution in the electrolyte solution when charged at current values higher than a predetermined level.
Innovation Solution
Implementing a configuration where charging of a swapped-out battery is not initiated until a specific time has elapsed after removal from the vehicle, using a timer to measure the remaining time until high-rate degradation is eliminated, and ensuring communication with a server to manage this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging is performed immediately after battery removal from vehicle, then charging efficiency is improved, but battery degradation increases due to high-rate degradation
Solution Approach 1:
The system performs preliminary action by measuring the time elapsed since battery removal from the vehicle before initiating charging. The control unit checks whether the elapsed time exceeds a predetermined threshold, and only permits charging after this time condition is satisfied. This preliminary time-based check prevents high-rate degradation by ensuring the battery is in a suitable state before charging begins, thus resolving the contradiction between charging efficiency and battery degradation.
2Reliability
If charging is delayed until specific time elapses, then battery degradation is reduced, but charging time increases
Solution Approach 1:
The system applies parameter changes by dynamically adjusting the charging start condition based on the elapsed time parameter. Instead of using a fixed charging schedule, the control unit monitors the time parameter since battery removal and uses this parameter to determine when charging should commence. This parameter-based control optimizes the balance between reducing battery degradation and minimizing charging time loss.
Data Source
AI summary
A battery is a swappable battery for driving an electrified vehicle. Charging of the battery is not started until a specific time (for example, elimination time, certain time) elapses from when the battery is connected to the charging device after being removed from the electrified vehicle. Thus, even when the battery is connected to the charging device after being removed from the electrified vehicle, the charging of the battery is not started until the specific time elapses. The specific time may be a time until high-rate degradation is eliminated. The high-rate degradation is a state in which the battery has an increased internal resistance due to an uneven lithium-ion concentration distribution in an electrolyte solution of the battery caused by charging or discharging including charging or discharging performed at a current value higher than a predetermined current value when the battery is connected to the electrified vehicle.