EV Range Display Control for Battery Deterioration
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Solution Overview
Problem
Users of electric vehicles experience a sense of incompatibility due to the rapid decrease in travelable distance caused by secondary battery deterioration, which is not accurately reflected in the display until the capacity retention ratio falls below a predetermined value, leading to a mismatch between perceived and actual battery health.
Innovation Solution
A display device with a control unit that manages the display of EV travelable distance and battery deterioration index, ensuring a slower initial decrease until the capacity retention ratio reaches a predetermined value, thereby minimizing user discomfort by synchronizing the display changes with the battery's actual state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the EV travelable distance is displayed based on the actual capacity retention ratio from the beginning, then the display accurately reflects the battery deterioration state, but the user experiences a sense of incompatibility due to the rapid initial decrease in travelable distance
Solution Approach 1:
The system performs preliminary action by maintaining the EV travelable distance at an initial value for a predetermined period after vehicle delivery, before the capacity retention ratio falls below a threshold. This preliminary maintenance of display values prevents the user from experiencing rapid initial decreases, while still enabling accurate deterioration display once the threshold is reached.
2Stability of the object's composition
If the capacity retention ratio threshold is set low, then the EV travelable distance remains stable for longer, but the display becomes less responsive to actual battery deterioration
Solution Approach 1:
The system changes the parameter of capacity retention ratio threshold to optimize the transition point. By setting the threshold to a specific value (e.g., 80%), the system achieves a balance where the EV travelable distance remains stable during the warranty period while becoming responsive to deterioration only when the battery actually degrades to a noticeable level.
3Measurement precision
If the EV travelable distance decreases rapidly to reflect quick battery deterioration, then the display accurately shows battery health, but the user feels incompatible with the quick decrease from purchase time
Solution Approach 1:
The system applies beforehand cushioning by maintaining the EV travelable distance at its initial value for a predetermined period or until a threshold is reached. This cushioning effect protects the user from experiencing rapid decreases early in the vehicle's life, while still enabling accurate deterioration reflection once the cushioning period ends.
Data Source
AI summary
A display device includes: a display unit configured to display an index corresponding to a deterioration state of a secondary battery and an EV travelable distance; and a control unit configured to control display of the display unit such that a first decreasing amount by which the EV travelable distance displayed on the display unit decreases with the elapse of time until a predetermined condition has been satisfied is less than a second decreasing amount by which the EV travelable distance displayed on the display unit decreases with the elapse of time after the predetermined condition has been satisfied.