EV Battery SOC Display Mapping for Temperature-Aware Charge Indication
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Solution Overview
Problem
Existing electrified vehicles display the battery state of charge (SOC) without considering temperature changes and external charging conditions, leading to driver complaints about undercharged or discharged batteries due to safety margins.
Innovation Solution
A battery control method that determines lower and upper limit reference points based on battery temperature and charging status, using inflection points to adjust the real SOC into a display SOC through specific equations, and outputs this adjusted SOC via devices like clusters or HUDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery SOC is displayed as the real SOC value, then the display accuracy is improved, but the driver may complain that the battery is not fully charged or discharged due to safety margins
Solution Approach 1:
The patent transforms the real SOC value into a display SOC value by applying parameter changes based on temperature conditions and charging/discharging states. The controller adjusts the SOC display range dynamically, expanding it when temperature is low or high to compensate for safety margins, thereby maintaining driver satisfaction while preserving accurate underlying measurements
2Reliability
If the battery usage range is limited to safety margins (5%-97%), then the battery reliability is improved, but the display SOC range is reduced causing driver complaints
Solution Approach 1:
The patent introduces an additional dimension to the SOC display by creating a mapping between real SOC and display SOC values. This dimensional transformation allows the display to show an expanded range (0%-100%) while the actual battery operation remains within safe limits (5%-97%), effectively resolving the contradiction between safety and display versatility
3Ease of operation
If the SOC display range is expanded beyond the real range, then the driver satisfaction is improved, but the SOC measurement precision may be compromised
Solution Approach 1:
The patent introduces an intermediary transformation process between real SOC measurement and display SOC presentation. The controller acts as an intermediary that applies conditional adjustment algorithms based on temperature and charging state, preserving the precision of real SOC measurement while adapting the display range to satisfy driver expectations
Data Source
AI summary
Proposed are an electrified vehicle in which a real state of charge (SOC) of a battery is converted into a display SOC based on conditions such as a change in temperature of the battery, whether the battery is charged by an external power source, and a battery control method of the electrified vehicle. Particularly, a lower limit reference point, an upper limit reference point, and an inflection point are determined, a corresponding relationship between a real SOC and a display SOC is determined based on the lower limit reference point, the upper limit reference point, and the inflection point, and the real SOC is capable of being converted into the display SOC based on the corresponding relationship.