Mechanism of particle ejection of lithium-ion batteries during thermal runaway. The above mechanisms indicate that the high-speed spouting gases carry the solid particles during the cell venting.
Based on the deduction of momentum principles, the derivative parameters pertaining to velocity, pressure, density, and compressibility during the battery ejection process were derived from the force and mass loss rate. Given the rapid fluctuation of the ejection process, a high sampling frequency is imperative.
In order to determine the continuous ejection parameters of high energy-density battery thermal runaway, the canister experiment approach has been developed [ 7, , , , ]. In this approach, the LIB sample is placed inside the canister and heated until TR occurs.
It was found that the solids and electrolyte vapours occupied the major release of venting materials, which were calculated as 7.19 g and 3.15 g, respectively, for the primary ejection. Subsequently, the battery mass presented a persistent decline until the internal decomposition reactions ended, and the battery went into a cooling stage.
In Fig. 6 (b), it is observed that the total ejection velocity of the battery thermal runaway reaches its peak of 210.86 m/s at 8.012 s. Similarly, in Fig. 6 (a), the mass loss rate reaches its peak of 0.041 kg/s at 6.012 s.
The mass loss attributed to the ejection of battery materials is a significant characteristic of the TR process for LIBs, which involves the conservation and conversion of multiphase and multicomponent.
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1 College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, China; 2 Gansu Engineering Laboratory of Electrolyte Material for Lithium-Ion Battery, Lanzhou, China; The development of lithium …
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