Battery Charging Profile Diagnosis Using CC-CV Capacity Change
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery technologies lack an effective method to accurately diagnose the state of batteries, particularly in terms of charge capacity, which is crucial for ensuring safety and preventing sudden drops.
Innovation Solution
A battery diagnosing apparatus and method that calculates capacity change rates based on constant current (CC) and constant voltage (CV) capacities using a correction coefficient, enabling non-destructive diagnosis of battery state by comparing these rates against a threshold value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional battery diagnosis methods are used, then the diagnosis process is simple, but the measurement precision of battery state is insufficient
Solution Approach 1:
The battery capacity is segmented into two distinct components: constant current (CC) capacity and constant voltage (CV) capacity. This segmentation allows for separate calculation and analysis of each component, enabling more precise diagnosis of battery state by evaluating the relationship between CC capacity degradation and CV capacity retention, rather than treating battery capacity as a single undifferentiated value.
Solution Approach 2:
The patent performs preliminary charging of the battery to a predetermined voltage before conducting the capacity measurement. This preliminary action ensures that the battery starts from a known state (fully charged to specific voltage), which standardizes the measurement conditions and improves the accuracy and repeatability of the diagnosis results.
2Reliability
If battery diagnosis is performed frequently, then the reliability of battery state monitoring is improved, but the loss of time and operational disruption increases
Solution Approach 1:
The diagnosis method utilizes the battery's normal charging process itself as the measurement opportunity. By calculating CC and CV capacities from charging data that is already being collected during routine charging operations, the system achieves continuous monitoring without requiring separate dedicated diagnosis sessions, thus maintaining high reliability while minimizing time loss and operational disruption.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A battery diagnosing apparatus according to one embodiment of the present disclosure includes: a profile acquisition unit that acquires a charging profile representing a correspondence between a voltage and a current of a battery measured during a charging process; and a control unit that calculates a first constant current (CC) capacity and a first constant voltage (CV) capacity from the charging profile, calculates a capacity change rate for the first CC capacity and the first CV capacity based on a second CC capacity and a second CV capacity stored in advance, and diagnoses a state of the battery based on the calculated capacity change rate and a preset correction coefficient.