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Wireless transmission of internal hazard signals in Li-ion batteries

Abstract

High-capacity lithium-ion batteries (LIBs) play a critical role as power sources across diverse applications, including portable electronics, electric vehicles (EVs) and renewable-energy-storage systems1. However, there is growing concern about the safety of integrated LIB systems, with reports of up to 9,486 incidents between 2020 and 2024 (ref. 2). To ensure the safe application of commercial LIBs, it is essential to capture internal signals that enable early failure diagnosis and warning. Monitoring non-uniform temperature and strain distributions within the jelly-roll structures of the battery provides a promising approach to achieving this goal3,4. Here we propose a miniaturized and low-power-consumption system capable of accurate sensing and wireless transmission of internal temperature and strain signals inside LIBs, with negligible influence on its performance. The acquisition of internal temperature signals and the area ratio between initial internal-short-circuited regions and battery electrodes enables quantitative analysis of thermal fusing and thermal runaway phenomena, leading to the evaluation of the intensity of battery thermal runaway and recognition of thermal abuse behaviours. This work provides a foundation for designing next-generation smart LIBs with safety warning and failure positioning capabilities.

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Fig. 1: An implantable sensing system for accurate sensing and wireless transmission of internal temperature and strain signals inside the LIBs.
Fig. 2: Operando measurement of internal strain and temperature.
Fig. 3: Localization of mechanical failure in cylindrical batteries.
Fig. 4: Detection of thermal failure in prismatic batteries.

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Data availability

The main data generated or analysed during this study are included in this article, the Extended Data and the Supplementary information. All other relevant data of this study are available from the corresponding author on request.

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Acknowledgements

This work was supported by the National Key R&D Program of China (grant no. 2021YFB2401900).

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Authors and Affiliations

Authors

Contributions

J.F., C.L. and N.L. wrote the manuscript. L.S. designed and built the chips. J.F. and C.L. designed and built the batteries. L.Y. and X.-G.Y. designed the experiments. J.F. and C.L. carried out the experiments and performed 3D numerical simulations. B.D. and S.H. built the backpropagation neural network model. X.F. optimized the thermal runaway experiments. J.F., C.L. and N.L. analysed and interpreted the results. H.J., H.L., W.-L.S. and H.-S.C. assisted in results interpretation and feedback. W.-L.S. assisted with figure creation. H.-S.C. conceived the idea, supervised the project and analysed the data. H.G. and D.F. supervised the project. All authors contributed to the preparation of the manuscript.

Corresponding authors

Correspondence to Wei-Li Song, Lei Sun or Hao-Sen Chen.

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The authors declare no competing interests.

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Nature thanks Jiangong Zhu and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

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Extended data figures and tables

Extended Data Fig. 1 Communication principle and reliability of the implantable sensing system.

a, Circuit diagram of the implantable sensing system integrated with a strain sensor connected to a Wheatstone bridge. b, Principle of signal modulation. c, The ratio of power consumption of wireless transmission with different types of battery for mode 1. Battery 1, Battery 2 and Battery 3 are 26Ah-Tesla, 190Ah-BYD and 280Ah-CATL, respectively. The data are retrieved from the media releases of Tesla, BYD and CATL. d, The stability of temperature sensors in an electrolyte environment over 70 days. e,f, Optical pictures of temperature (e) and strain (f) sensors before and after immersing in electrolyte. g,h, Calibration results of the implantable sensing systems for the temperature (g) and strain sensors (h).

Extended Data Fig. 2 Integration process of implantable sensing systems.

a, The size of the strain sensor. b, Schematic illustration of the integrated sensor processes. c,d, Pictures of the integrated temperature sensor (c) and strain sensor (d) processes. e,f, Pictures of chip–sensor–battery integrated design in prismatic (e) and cylindrical (f) batteries. The sizes of the thin-film temperature and strain sensors are 60 × 8 × 0.05 mm3 and 70 × 5 × 0.05 mm3, respectively (50 μm: thickness of the dried slurry from active materials, binders and conductive agents on the current collectors).

Extended Data Fig. 3 The impact of implanting sensing systems on battery performance.

ac, EIS (a), DRT (b) and resistance (c) of prismatic batteries with and without (w/ and w/o, respectively) the implantable sensing system. df, EIS (d), DRT (e) and resistance (f) of cylindrical batteries with and without the implantable sensing system. g,h, Charge—discharge curves (g) and rate performance (h) of prismatic batteries with and without the implantable sensing system. i,j, Charge—discharge curves (i) and rate performance (j) of cylindrical batteries with and without the implantable sensing system.

Extended Data Fig. 4 The cost analysis of implantable sensing systems (details in Supplementary information).

a, The costs of the sensors and chips. b, The costs for different types of battery. c,d, The cost ratios of implantable sensing systems for temperature (c) and strain (d) sensors in different types of battery.

Extended Data Fig. 5 Decoupling electrochemically induced and thermally induced strain for prismatic batteries.

a, Strain responses in different layers of the prismatic batteries to temperature in the thermal loading experiment. b,c, Internal temperature and strain of prismatic batteries at currents of 1.0 C (b) and 2.0 C (c). df, Decoupled strain and temperature for prismatic batteries at currents of 0.5 C (d), 1.0 C (e) and 2.0 C (f).

Extended Data Fig. 6 Decoupling electrochemically induced and thermally induced strain in cylindrical batteries.

a, Strain responses in different layers of cylindrical batteries to temperature during the thermal loading experiment. b,c, Internal temperature and strain of cylindrical batteries at currents of 1.0 C (b) and 2.0 C (c). df, Decoupled strain and temperature for cylindrical batteries at currents of 0.5 C (d), 1.0 C (e) and 2.0 C (f).

Extended Data Fig. 7 Internal inhomogeneous strain in different layers of cylindrical batteries.

af, Internal strain in different winding layers during cycles at the rate of 0.2 C: 4th and 15th layers (a); 5th and 15th layers (b); 9th and 15th layers (c); 11th and 15th layers (d); 13th layer (e); 14th layer (f). g, The spiral-wound structure geometric model of cylindrical batteries. h, Schematic diagram of load and constraints. i, Circumferential strain contour of Al current collector by simulation.

Extended Data Fig. 8 Electrode fracture in cylindrical batteries.

a, Picture of electrode fracture in a positive electrode. b, X-ray tomography image of the battery with electrode fracture. c,d, Evolution of internal strain in pristine battery (c) and battery with pre-set fracture (d). e, Circumferential strain contours of the battery with pre-set fracture. f, BP neural network training and testing loss in electrode fracture localization.

Extended Data Fig. 9 ISC in prismatic batteries.

a, Schematic illustration of the ISC device principle. b, Equivalent circuit of the ‘short-circuit electronic resistance’. c, Pictures of the ISC device within the battery. d, Pictures of ISC positions after ISC triggering in case 1. eg, ISC simulation of case 1 (details in Supplementary information). h,i, Post-mortem pictures of the battery after global thermal runaway of case 2.

Extended Data Fig. 10 Voltage and temperature responses of prismatic batteries with winding jelly roll at different α values during ISC.

a, α = 0.00000776 (70 Ah). b, α = 0.00000776 (70 Ah). c, α = 0.00031 (50 Ah). d, α = 0.00037 (70 Ah). e, α = 0.00061 (0.9 Ah). f, α = 0.00067 (0.81 Ah). g,h, Post-mortem pictures at α = 0.00061 and α = 0.00067.

Supplementary information

Supplementary Information (download DOCX )

This file contains Supplementary Text, Supplementary Figs. 1–12, Supplementary Tables 1–8 and Supplementary References.

Supplementary Video 1 (download MP4 )

Wireless transmission of internal temperature and strain signals in lithium-ion batteries.

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Fan, J., Liu, C., Li, N. et al. Wireless transmission of internal hazard signals in Li-ion batteries. Nature 641, 639–645 (2025). https://doi.org/10.1038/s41586-025-08785-7

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