Vehicle Battery Capacity Retention Indicator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for evaluating the deterioration of secondary batteries in vehicles are inaccurate due to variations in initial full charge capacities, leading to inconsistent assessment of battery health and potential user dissatisfaction upon delivery of new vehicles.
Innovation Solution
A vehicle system that sets a reference capacity based on a predetermined period after manufacture, using a capacity retention rate calculated as the ratio of the current battery capacity to this reference capacity, displayed on an instrument panel to accurately evaluate battery deterioration and prevent initial low readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the capacity retention rate is calculated using the initial full charge capacity of each secondary battery, then the calculation is simple, but the evaluation accuracy deteriorates due to production tolerances and initial capacity variations
Solution Approach 1:
The patent changes the reference parameter from initial full charge capacity (which varies due to production tolerances) to a standardized reference capacity value. This parameter change eliminates the influence of initial capacity variations while maintaining calculation simplicity, thereby resolving the contradiction between ease of manufacture and measurement precision.
2Measurement precision
If the reference capacity is set based on initial full charge capacity, then the capacity retention rate reflects actual deterioration, but user dissatisfaction increases due to low initial readings upon delivery
Solution Approach 1:
The patent applies preliminary action by setting the reference capacity in advance based on expected deterioration after a predetermined period, rather than using the initial capacity. This allows the capacity retention rate to start at 100% upon delivery and gradually decrease, preventing user dissatisfaction while still accurately reflecting actual deterioration over time.
3Stability of the object's composition
If the capacity retention rate is standardized using a common reference capacity, then the evaluation consistency improves across multiple vehicles, but the relationship with initial capacity variations is lost
Solution Approach 1:
The patent extracts the deterioration component from the total capacity variation by using a standardized reference capacity. This separates the evaluation into two parts: the standardized capacity retention rate for consistent comparison across vehicles, and the initial full charge capacity information that is preserved separately for vehicles with different battery specifications.
Data Source
AI summary
A vehicle includes a secondary battery and a display device. The secondary battery is mounted on the vehicle as a power source. The display device is configured to display an indicator that indicates a capacity retention rate of the secondary battery at a current point in time. The capacity retention rate is a ratio of a capacity of the secondary battery at the current point in time to a reference capacity of the secondary battery. The reference capacity is set in advance based on a virtual capacity of the secondary battery after a lapse of a predetermined period from manufacture of the vehicle.