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Strain Gauge-Based Analysis of Charge-Discharge Behavior and Degradation Characteristics in 18650 Lithium-Ion Batteries
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DOI：10.3795/KSME-A.2026.50.4.303.png)
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Abstract
En 中文
This study aims to diagnose the early-stage degradation of 18650 lithium-ion batteries by conducting 20 constant-current/constant-voltage (CC-CV) charge-discharge cycles on both new (N.C.) and used (U.C.) cells. During the charge-discharge processes, strain was measured by attaching a strain gauge to the central region of the cell casing, while the voltage response was simultaneously monitored. The N.C. exhibited nearly constant strain behavior and reversible elastic deformation throughout all cycles. In contrast, the U.C. showed an increase in maximum strain, accumulation of residual strain, and pronounced nonlinear hysteresis, confirming the progression of internal structural degradation. Although both cells maintained similar voltage ranges under protection circuit module (PCM) control and appeared to show no apparent performance degradation, the strain response of the U.C. clearly revealed early degradation signals. These findings suggest that casing strain-based measurements provide an effective and non-destructive approach for diagnosing internal damage in lithium-ion batteries that is difficult to identify using electrical signals alone.
Keywords:
Lithium-Ion Battery
Strain Measurement
Casing Deformation
Charge-Discharge Cycling
Early Degradation Diagnosis
Residual Strain
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0.2
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87
Citations:
308
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