Battery Degradation Identification from Capacity-Voltage Cycle Data
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Solution Overview
Problem
Current methods for analyzing lithium-ion battery degradation require specialized testing equipment and involve fully charging or discharging the battery, leading to high costs and complex processes, which are not suitable for real-world scenarios where batteries are typically not fully charged or discharged.
Innovation Solution
A method that identifies battery degradation by acquiring battery data related to cycle counts, including capacities and voltages, and processing these data to determine capacity and voltage sets, allowing for degradation assessment without specialized equipment, using incremental voltage units and fitting processes to identify degradation coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specialized testing equipment and full charging/discharging methods are used for battery degradation analysis, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses battery management system data (capacity, voltage, current) as a simplified copy or representation of the actual battery state, eliminating the need for complex specialized testing equipment while maintaining degradation analysis capability through mathematical processing of these surrogate measurements
Solution Approach 2:
The patent replaces physical mechanical testing equipment with an electronic data processing system that uses existing battery management system data, substituting complex hardware-based measurement with software-based analysis of electrical parameters
2Measurement precision
If full charging or discharging is required before analysis, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent uses partial charging/discharging data from normal battery operation instead of requiring complete charge/discharge cycles, analyzing degradation based on a portion of the battery's operational data which is sufficient for accurate assessment without the time cost of full cycles
Solution Approach 2:
The patent continuously collects and stores battery data during normal operation in advance, so that degradation analysis can be performed immediately without waiting for full charge/discharge cycles to complete, as the necessary data is already accumulated from ongoing usage
3Measurement precision
If full charging or discharging is required, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent enables continuous battery degradation monitoring by using data from ongoing normal battery operation, allowing multiple batteries to be analyzed simultaneously and continuously without interrupting their normal use, thereby significantly increasing analysis throughput compared to batch processing after full cycles
4Measurement precision
If specialized testing equipment is used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent makes the battery system self-diagnostic by using its own existing data (capacity, voltage, current from the battery management system) to perform degradation analysis, eliminating the need for external specialized equipment and complex operational procedures while maintaining analysis accuracy
Data Source
AI summary
A method, apparatus, medium and electronic device for identifying degradation degree of battery. The method includes: acquiring battery data corresponding to a current cycle count, wherein the battery data comprise battery capacities and battery voltages of the battery; acquiring, based on the battery capacities and the battery voltages, capacity differences corresponding to the battery voltages; acquiring, based on the battery voltages and the capacity differences, a surge set of the capacity differences and a voltage set corresponding to the surge set; and identifying a degree of the battery degradation based on the surge set and the voltage set, to obtain an identification result related to the current cycle count. The method can identify the degree of battery degradation without applying other specialized testing equipment, thereby reducing the cost of identifying the degree of degradation, thereby simplifying the process.