Battery module

Abstract

The invention provides a battery module. The battery module comprises a plurality of single batteries, a frame and a protection plate, wherein the plurality of single batteries are sequentially arranged along an arrangement direction, the frame is used for accommodating and fixing the plurality of single batteries, the protection plate is arranged between the frame and the plurality of single batteries so that the frame and the single batteries are isolated along a side surface of a vertical direction F, the protection plate comprises an expansible graphite plate and an insulation sealing film, the expansible graphite plate comprises a substrate and expansible graphite particles, the substrate is formed from an adhesive, the expansible graphite particles are distributed in the substrate, and the insulation sealing film at least wraps one side, facing the single batteries, of the expansible graphite plate so that the plurality of single batteries are separated from the expansible graphite plate. In the battery module according to the invention, the volume is instantaneously expanded after the expansible graphite plate of the protection plate meets high temperature when a certain single battery generates thermal runaway, heat transferred to the other single batteries which are not in out-of control by the frame can be reduced during the expansion process, thermal runaway spreading is prevented or reduced, and the safety of the battery module is improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a battery module. Background technique [0002] Compared with other traditional secondary batteries, lithium-ion batteries have the advantages of high specific energy and excellent power performance. Therefore, lithium-ion batteries are not only maturely applied in the field of electronic consumer products, but also gradually expanded in the fields of new energy vehicles, electric cruise ships and energy storage. With the gradual expansion of lithium-ion batteries to applications with high energy and high power requirements, the large-scale group use of lithium-ion batteries has become an inevitable trend of its development. However, the safety issue is one of the important obstacles to the large-scale application of lithium-ion batteries. Due to the material system and structural characteristics, under the conditions of overcharge, overdischarge, overheating, mechanical extrusion, acu...

AI Technical Summary

Problems solved by technology

Due to the limitation of the length of the lithium-ion battery module, the space available for heat insulation design between the cells is often very small. Ultra-insulation materials with a thermal conductivity as low as 0.02w / (m k) are difficult to prevent the spread of thermal diffusion. Similar to the existing designs of Tesla and Rawlinson, it is extremely difficult to prevent the spread of thermal runaway

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