Electrified Vehicle Charging Control for Battery Degradation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As electrified vehicles age, the battery input electric power limit is set low to suppress deterioration, limiting their performance and overall vehicle performance.
Innovation Solution
A control device sets a higher charging current input limit based on the vehicle's cumulative use index, such as traveling distance or years of use, to maintain battery performance and suppress degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery input electric power limit value is set to a small value to suppress deterioration, then the progress of deterioration of the battery is suppressed, but the battery performance and vehicle performance cannot be sufficiently exhibited
Solution Approach 1:
The patent applies dynamics by making the battery input electric power limit value adjustable rather than fixed. The control device dynamically changes the limit value based on the vehicle use ratio, allowing the system to adapt between conservative mode (low limit for durability) and performance mode (high limit for capability) depending on whether the vehicle is new or aged
Solution Approach 2:
The patent changes the parameter of battery input electric power limit value based on the vehicle use ratio. When the vehicle use ratio is high (indicating an older vehicle), the limit value is set higher to maintain performance, while when the ratio is low (newer vehicle), the limit is set lower to suppress deterioration
2Reliability
If the battery input electric power limit value is set to a small value, then the progress of deterioration of the battery is suppressed, but the vehicle lifetime is shortened
Solution Approach 1:
The system dynamically adjusts the battery input limit based on vehicle age (use ratio). Older vehicles receive higher limits to extend their usable lifetime, while newer vehicles receive lower limits to ensure long-term durability, thereby optimizing the overall service life of the vehicle fleet
Solution Approach 2:
The control device preliminarily determines the appropriate battery input limit based on the calculated vehicle use ratio before charging operations begin. This preliminary assessment allows the system to proactively set optimal limits that balance deterioration suppression with lifetime extension
Data Source
AI summary
An electrified vehicle includes an electric motor configured to output power for traveling, an electric power storage device configured to supply electric power to the electric motor, and a control device configured to set an input limit as a maximum value of a charging current in charging the electric power storage device using electric power from an external power supply. The control device is configured to set a greater value as the input limit when a vehicle use ratio as a proportion of a use index indicating a degree of cumulative use of the vehicle to a prescribed maximum value of the use index is large than when the vehicle use ratio is small.