National Physical Laboratory

Detection of internal defects in lithium ion batteries using lock-in thermography.

Robinson, J B*, Engebretsen, E*, Finegan, D P*, Darr, J*, Hinds, G, Shearing, P R*, Brett, D J L*
ECS Electrochem. Lett., 2015, 4, (9), A106-A109
NPL Doc. Ref:
PDB: 7670 | DDB: 7064
Document Type:
Periodical article

Note: An asterisk after an author's name indicates a non-NPL author.


Effective thermal management is essential for maximising performance and durability of Li-ion batteries. Infrared thermal imaging is an established technique for studying temperature distribution in real-time with high spatial resolution; however, dynamic thermal imaging offers greater sensitivity, the ability to correct for emissivity variation and identify heat transfer mechanisms and internal defects. Here, for the first time, lock-in thermography using a thermal imaging camera is applied to Li-ion batteries to investigate the effect of periodic electro-thermal stimulation on the amplitude and phase response of both new and aged Li-ion pouch cells. We demonstrate the effectiveness of this technique in the detection of gas pockets formed during cell aging and propose its application in the identification of a range of internal defects in operational systems and validation of thermal models.

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