Secondary Battery Temperature Hold After Charging to Prevent Lithium Plating
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Solution Overview
Problem
Secondary batteries, such as lithium ion batteries, face challenges in diagnosis and management, particularly during periods of low environmental temperatures where internal resistance increases and voltage reaches upper limits quickly, making it difficult to obtain sufficient measurement data for accurate state estimation and evaluation.
Innovation Solution
Implementing a temperature control method after charging, where the battery's temperature is maintained within a predetermined range (lower-limit to upper-limit temperature) in the second period following a diagnosis in the first period, to prevent lithium metal precipitation and manage the battery safely even when diagnosis is difficult.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the secondary battery is charged at low environmental temperatures, then the voltage reaches upper-limit quickly, but sufficient measurement data cannot be obtained for accurate internal state estimation
Solution Approach 1:
The system performs preliminary diagnosis during periods when sufficient measurement data can be obtained (first period), stores the diagnosed internal state information, and uses this stored information to manage the battery during periods when diagnosis is difficult (second period). This preliminary action allows accurate state estimation even when real-time measurement data is insufficient due to low temperature charging conditions.
2Duration of action of moving object
If the secondary battery is used for a long time, then the battery provides sustained power, but the internal state varies and deterioration occurs making diagnosis difficult
Solution Approach 1:
The system periodically diagnoses the battery internal state when sufficient measurement data is available, updates the stored diagnosis information, and uses this feedback loop to continuously improve state estimation accuracy over time. This allows reliable diagnosis even as the battery deteriorates with long-term use.
3Productivity
If temperature control is not performed after charging, then the battery can be used immediately, but lithium metal precipitation may occur causing safety issues
Solution Approach 1:
The system performs preliminary temperature control after charging when lithium metal precipitation is predicted, maintaining the battery at appropriate temperatures to prevent precipitation. This preliminary safety measure allows the battery to be used safely afterward, balancing productivity with reliability.
Data Source
AI summary
In an embodiment, a management method of a secondary battery is provided. In the management method, temperature control of the secondary battery is executed in a second period after a first period in which the secondary battery is diagnosed, when the secondary battery is charged under a charge condition under which precipitation of lithium metal in the secondary battery is predicted based on a diagnosis result in the first period. In the temperature control of the secondary battery, a temperature of the secondary battery after a time point of an end of charge under the charge condition in the second period is kept in a predetermined temperature range of a lower-limit temperature to an upper-limit temperature.