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. 2021 Feb 17;21(4):1397. doi: 10.3390/s21041397

Figure 4.

Figure 4

External vs. internal cell temperature difference by fiber Bragg grating (FBG) sensors: (a) temperature change from internal and external measurements of Li-ion pouch cell under 5 C-rate discharge/charge [118]; (b) internal cell and ambient temperature data of Li-ion coin cell under C/20 rate [119].