Battery Management System Using Surface Pressure for Replacement Selection
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Solution Overview
Problem
Existing battery management systems do not effectively utilize usage history to select a replacement battery that matches the specific driving habits of a vehicle user, particularly for high-rate driving, leading to inadequate battery performance and premature degradation.
Innovation Solution
A battery management system that measures surface pressure to calculate a high-rate driving frequency coefficient, deriving the frequency of high-rate driving and selecting a replacement battery, such as a high-power battery, based on this data, while considering user preferences for acceleration and electric vehicle range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard battery replacement method is used without considering usage history, then the replacement process is simple and quick, but the selected battery may not match the user's driving habits, leading to premature degradation
Solution Approach 1:
The system performs preliminary analysis of usage history (acceleration frequency, high-rate driving frequency, surface pressure data) before battery replacement to pre-determine the appropriate battery specifications. This allows the selection process to be data-driven rather than generic, improving reliability without significantly increasing on-site complexity.
Solution Approach 2:
The system uses feedback from the surface pressure sensor and usage history data to continuously monitor battery condition and driving patterns. This feedback loop enables the system to select replacement batteries that match actual usage characteristics, resolving the contradiction between simple replacement and performance matching.
2Power
If a high-power battery is selected for users with high high-rate driving frequency, then acceleration performance and drivability improve, but battery cost and size increase
Solution Approach 1:
The system changes the battery selection parameter from a generic standard to a customized specification based on the calculated high-rate driving frequency coefficient. By adjusting parameters like maximum discharge current and power rating according to actual usage patterns, the system optimizes the balance between performance and weight/cost.
Solution Approach 2:
The system applies local quality by tailoring battery specifications to individual user needs rather than using a uniform approach. Users with high acceleration demands receive high-power batteries, while others receive appropriately sized batteries, optimizing the power-to-weight ratio for each case.
3Reliability
If usage history monitoring is implemented to select appropriate replacement batteries, then battery degradation is prevented and performance is optimized, but the system complexity and measurement requirements increase
Solution Approach 1:
The battery management system performs self-service by automatically monitoring its own usage conditions through integrated surface pressure sensors and control units. This self-monitoring capability enables the system to track acceleration events and high-rate driving frequency without requiring external monitoring equipment, reducing overall system complexity.
Solution Approach 2:
The surface pressure sensor acts as an intermediary that indirectly measures battery usage conditions. Instead of directly monitoring complex electrical parameters, the system uses surface pressure changes as a proxy indicator of battery stress and usage patterns, simplifying the monitoring approach while maintaining reliability.
Data Source
AI summary
A battery management system includes: measuring a surface pressure of a vehicle-mounted secondary battery (battery cell) for driving the vehicle with a lapse of time; calculating a high-rate driving frequency coefficient on the basis of the measured surface pressure at intervals of a predetermined period (24 hours); deriving a high-rate driving frequency on the basis of the number of times that the calculated high-rate driving frequency coefficient has exceeded a predetermined threshold; and selecting a replacement battery from among batteries including a high-power battery on the basis of the derived high-rate driving frequency.