EV Battery Charging Schedule Control for Durability and Power Supply
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Solution Overview
Problem
Existing secondary battery management systems for electric vehicles struggle to maintain sufficient battery durability and vehicle convenience, especially when the external storage battery is unavailable, leading to potential issues with electricity supply and battery deterioration.
Innovation Solution
A secondary battery management device that includes a target setting portion, main charging setting portion, discharging setting portion, and sub-charging setting portion, which collectively manage the charging and discharging processes of the secondary battery to achieve a target charging rate while minimizing battery deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high charging rate is applied to the secondary battery, then the charging speed is improved, but the battery durability deteriorates
Solution Approach 1:
The charging process is divided into multiple charging periods with different charging rates. The control device applies a first charging rate during a first charging period and a second charging rate during a second charging period, thereby segmenting the charging process to balance speed and durability.
Solution Approach 2:
The charging rate is dynamically adjusted based on the state of charge and time. The control device changes the charging rate between different periods, making the charging process adaptive rather than static, which allows optimizing both speed and battery health.
2Device complexity
If the storage battery of the power storage unit is unavailable, then the system complexity is reduced, but the electricity supply reliability deteriorates
Solution Approach 1:
The secondary battery in the vehicle is managed autonomously through a control device that automatically adjusts charging rates and schedules without requiring external power storage units. The system serves itself by intelligently managing the battery's charging process based on internal state and external conditions.
Solution Approach 2:
The control device changes operating parameters (charging rates, charging periods) based on the battery's state of charge and environmental conditions. By adjusting these parameters dynamically, the system maintains electricity supply reliability without needing additional external storage batteries.
Data Source
AI summary
A secondary battery management device includes a target setting portion that sets a target charging rate that is a target for a charging rate of a secondary battery mounted in a vehicle, and a target charging rate reaching time that is a time when main charging in which the secondary battery is charged to the target charging rate at a main charging speed is completed; a main charging setting portion that sets a main charging start time when the main charging is started and the main charging speed on the basis of an output of a charger, the target charging rate, and the target charging rate reaching time; at least one of a discharging setting portion that sets a discharging start time when discharging of the secondary battery is started and a discharging speed that is a speed of the discharging, and a sub-charging setting portion that sets a sub-charging start time when sub-charging in which the secondary battery is charged at a sub-charging speed is started and the sub-charging speed; and a charging/discharging execution portion that executes the main charging, the discharging, and the sub-charging in accordance with set details.