Underwater device lithium battery system and underwater device

Abstract

The invention relates to the technical field of batteries, and discloses an underwater device lithium battery system and an underwater device. The lithium battery system comprises a battery shell, a plurality of battery modules, an insulating thermal isolation unit, a thermal insulation plate and a fixed guide rail, the plurality of battery modules are arranged in the battery shell, the fixed guide rail is used for fixing the plurality of battery modules, each battery module comprises a battery cell and a nickel sheet arranged on the battery cell, and the nickel sheet is arranged on the battery cell. The plurality of battery modules are connected in series and in parallel through the nickel sheets, the heat insulation plates are arranged between the adjacent battery modules, the positive electrode and the negative electrode of each battery module are provided with the insulation heat isolation units, and each insulation heat isolation unit comprises an insulation plate, a directional heat conduction plate and a fireproof plate which are sequentially stacked; the insulation plate is in contact with the battery module, the fireproof plate is in contact with the heat insulation plate, and the directional heat conduction plate is used for heat dissipation in the horizontal direction and heat isolation in the thickness direction.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium battery system for an underwater device and an underwater device. Background technique [0002] The safety of the lithium battery system is mainly reflected in the thermal safety caused by the thermal runaway of the battery, which is manifested in two forms of fire and explosion. Battery thermal runaway is caused by the fact that the heat generation rate of the battery is much higher than the heat dissipation rate, and a large amount of heat is accumulated and not dissipated in time. The heat released after the partial thermal runaway of a single cell spreads to the surroundings, which will heat the surrounding batteries and possibly cause the thermal runaway of the surrounding batteries, that is, the diffusion of thermal runaway in the battery pack. The energy released by a single battery after thermal runaway is limited, but if a chain reaction occurs and the expan...

AI Technical Summary

Problems solved by technology

The energy released by a single battery after thermal runaway is limited, but if a chain reaction occurs that causes thermal runaway to expand, the energy of the entire battery pack will be released through thermal runaway, which will cause great danger

Therefore, when the thermal runaway occurs locally in the lithium battery, it is necessary to thermally isolate the faulty cell in time to avoid the thermal spread of the thermal runaway to the surrounding batteries, which will cause more serious safety accidents.

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