Battery Charging Control With Pre-Cooling for Deteriorated Cells
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Solution Overview
Problem
Battery deterioration leads to accelerated degradation due to increased resistance and heat generation during external charging, resulting in reduced maximum capacity and shorter charging times.
Innovation Solution
A charging control device that acquires battery information, derives an estimated charging time based on this information, and calculates a difference time between the estimated and set charging times. The device then performs external charging while cooling the battery throughout the difference time and charging throughout the estimated time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If external charging is performed on a deteriorated battery, then charging speed increases, but heat generation increases and battery deterioration accelerates
Solution Approach 1:
The cooling operation is performed before the charging operation to proactively reduce battery temperature. The control device calculates a cooling period based on the difference between estimated charging time (from battery information) and set charging time, then executes cooling during this period before charging begins. This preliminary cooling action prevents heat generation during charging while maintaining the desired charging speed.
2Loss of time
If external charging is performed on a deteriorated battery, then charging time decreases, but battery deterioration accelerates due to extended high SOC duration
Solution Approach 1:
The control device performs cooling before charging to extend the overall time profile. By calculating the difference between estimated charging time (derived from battery information indicating deterioration) and set charging time, the device schedules cooling during this difference period, thereby reducing the duration the battery spends at high SOC and slowing deterioration.
3Reliability
If cooling is performed before charging, then battery temperature decreases and deterioration decelerates, but total time required increases
Solution Approach 1:
The control device dynamically adjusts the cooling period duration based on battery information parameters. It calculates the cooling time as the difference between estimated charging time (derived from battery capacity and deterioration state) and set charging time. This parameter-based adjustment ensures cooling is performed only long enough to achieve the necessary temperature reduction, minimizing total time while effectively decelerating deterioration.
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
This approach reduces the duration of high state of charge (SOC) in deteriorated batteries, minimizes heat generation, and effectively decelerates battery deterioration, allowing for full charging within the set time.
Implementation Method 1
the battery is to be cooled throughout the difference time
Data Source
AI summary
A charging control device includes an acquirer, a first deriver, a second deriver, and an executer. The acquirer is configured to acquire battery information regarding a battery. The first deriver is configured to derive an estimated charging time estimated as time to be taken to charge the battery in external charging of the battery. The estimated charging time is derived based on the battery information. The second deriver is configured to derive a difference time between the estimated charging time and a set charging time set as time for which the external charging of the battery is to be performed. The executer is configured to perform the external charging of the battery such that the battery is to be cooled throughout the difference time and the battery is to be charged throughout the estimated charging time.