Battery SOC-OCV Curve Acquisition With Intermittent Charging
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Solution Overview
Problem
Conventional methods for acquiring the SOC-OCV characteristic curve of a secondary battery are time-consuming and inefficient, as they only provide a single index representing battery deterioration, failing to accurately assess the state of deterioration.
Innovation Solution
A system and method that employs intermittent and continuous charging modes to measure open circuit voltage (OCV) and capacity, generating an SOC-OCV characteristic curve by storing and combining data from multiple charging cycles, thereby reducing measurement time and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional continuous charging method is used to acquire SOC-OCV characteristic curve, then measurement completeness is improved, but time consumption increases significantly
Solution Approach 1:
The patent applies periodic action by implementing intermittent charging with regular intervals. The charge control unit performs charging at predetermined intervals rather than continuously, allowing the battery to rest between charging periods. This periodic charging approach enables OCV measurements to be taken at multiple SOC points across different charging cycles, eventually building a complete SOC-OCV characteristic curve over time without requiring continuous charging sessions.
2Measurement precision
If multiple charging cycles are performed to acquire complete SOC-OCV data, then measurement completeness is improved, but battery degradation increases
Solution Approach 1:
By using periodic intermittent charging instead of continuous charging, the battery undergoes rest periods between charging intervals. These rest periods reduce thermal stress and chemical degradation that would occur during continuous charging. The systematic arrangement of charging at predetermined intervals allows complete SOC-OCV data acquisition while minimizing cumulative degradation through reduced charging duration and thermal exposure.
Solution Approach 2:
The patent maintains continuity of useful action by systematically accumulating OCV-SOC data points across multiple intermittent charging cycles. Rather than requiring a single continuous charging session, the system continuously gathers characteristic curve data over time through repeated intermittent charging, ensuring complete measurement coverage while allowing the battery to recover between cycles.
3Loss of time
If intermittent charging with OCV measurement is used, then time consumption is reduced, but measurement completeness deteriorates
Solution Approach 1:
The charge control unit implements periodic charging at predetermined intervals across multiple cycles. Each charging interval allows OCV measurement at specific SOC points. By systematically repeating this process, the system accumulates OCV data across the entire SOC range (0-100%) over multiple cycles, ensuring complete characteristic curve acquisition despite the intermittent nature of individual charging sessions.
Solution Approach 2:
The system performs preliminary charging actions at predetermined intervals to reach specific SOC thresholds before measurements are taken. By planning charging intervals in advance and stopping at predetermined SOC points, the system efficiently collects necessary data points without requiring continuous charging, thus reducing total time while maintaining measurement completeness.
Data Source
AI summary
A battery characteristic acquisition system includes a charge control unit, a measuring unit, a storage unit, and a characteristic curve generating unit. The charge control unit charges a battery. The measuring unit measures an OCV before the start of charging of the battery and a charged capacity charged from the start of charging to the completion of charging to full charge, and calculates an SOC at the start of charging by subtracting the measured charged capacity from the full charge capacity of the secondary battery. The storage unit stores the OCV and the SOC obtained from a plurality of times of measurement and calculation. The characteristic curve generating unit generates an SOC-OCV curve of the battery using a plurality of OCVs and remaining capacities.