▎ 摘　　要

NOVELTY - Heat absorbing composite material comprises a first organic material and a second organic material which are uniformly mixed, where the first organic material contains at least one of acid anhydride group, ester group, isocyanate group, aldehyde group, the second organic material contains hydroxy group, carboxy group, amino and the heat-absorbing composite material is suitable for being set on the outer surface of the electric core. USE - The heat absorbing composite material is useful in lithium-ion battery unit (claimed). ADVANTAGE - The composite material: is being set on the outer surface of the electric core to improve the safety of lithium-ion battery unit. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing the heat-absorbing composite structure, comprising uniformly mixing the heat-absorbing composite material with a fiber substrate to obtain a mixture, and hot pressing the mixture to obtain the heat absorbing composite structure, and heat absorbing composite structure is suitable for attaching on the outer surface of the electric core; heat absorption composite structure, is prepared by the above preparation method; and lithium-ion battery unit, comprising a casing and multi electric cores located in the casing, and the outer surface of the electric core is provided with the heat-absorbing composite structure, preferably, outer surface of casing inner surface is further provided with heat absorbing composite structure.