Composite material power battery pack having damage perception effect and preparation method thereof

Abstract

The invention discloses a composite material power battery pack having a damage perception effect and a preparation method thereof. A joint part of a power battery base and an upper cover is pressed tightly and sealed through a connecting piece; a U-shaped groove is formed in the middle of the bottom part of the base; a plurality of piezoelectric sensors parallel to the U-shaped groove are all arranged in the middle of a composite layer of the base and the upper cover; the two ends of each piezoelectric sensor are respectively integrated on each plug-and-socket hole and the plug-and-socket holes are connected with a detecting and measuring instrument; a cable lead-out device is mounted in a side wall hole of the base. Die pressing on the base and the upper cover is carried out by adoptinga female die and a male die, and a die release agent, an outer carbon fiber layer, a glass fiber layer, sensor layers implanted into the piezoelectric sensors and an inner carbon fiber layer are sequentially laid in the female die; the quantity of fiber layers and angles of the fibers are calculated and determined according to load conditions; the die release agent, the outer carbon fiber layer, the glass fiber layer, the sensor layers, and the inner carbon fiber are put into the male die coated with the die release agent after being laid and are pressed tightly and solidified. The composite material power battery pack disclosed by the invention has the characteristics of low cost, light weight and massive production, and can be applied to shells of power batteries of all pilotless aircraft, aircraft, all electric automobiles and the like.

Description

technical field [0001] The invention relates to a power battery pack and a preparation method thereof, in particular to a damage-sensing composite power battery pack and a preparation method thereof. Background technique [0002] The power battery pack is a component used to safely carry the power battery in an electric vehicle. Its safety is very important. The traditional power battery pack is made of steel. As electric vehicles have higher and higher requirements for various indicators, the lightweight of vehicles It has become a main development direction, and the lightweight of the battery pack structure has also become the main goal. At present, high-strength steel, aluminum alloy and composite materials are mainly used as lightweight new materials for battery pack lightweighting, and the effect is very significant. In particular, the composite material structure can reduce the weight by 50% compared with traditional metal materials, so it is more and more widely used....

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Problems solved by technology

[0003] At present, the patents related to composite power battery packs mainly include ZL201620578424.0 "a power battery pack box structure" by Li Ruifeng and others. has declined; Ningde Times New Energy Technology Co., Ltd. ZL201621061423.5 "Power Battery Pack Top Cover Structure" proposes a SMC composite power battery top cover, which can reduce the weight of the battery pack, but the battery pack body structure is still It is made of metal; ZL201320884689.X "a composite battery insulation box" of Chengdu Kaimai Technology Co., Ltd. uses metal, insulation layer, and composite materials to insulate the power battery, which is convenient for the energy and heat management and control of the battery; US2014352886A1 " Battery pack case assembly for electric and hybrid vehicles using a plastic composite and a method for manufacturing the same” introduced a power battery structure and manufacturing method; Zhao Zizhou’s ZL201610188261.X “A Lithium Battery Pack” introduced a lithium battery pack for The modified carbon fiber composite frame of the battery is good for heat dissipation and has a flame retardant function

There are many patents for composite power battery packs, but no patents with damage sensing function have been applied for

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