Battery Pack for Electric Vehicle

Abstract

A battery pack for an electric vehicle, including a battery pack housing, in which a battery pack composed of a plurality of battery modules connected in series and in parallel is installed, and the battery module is composed of a plurality of cylindrical single cells or supercapacitors in series Composed in parallel, the single cells or supercapacitors are fixed in the heat-conducting insulating fixture, and are in close contact with the conductive and heat-conducting components in the heat-conducting and insulating fixture to form an overall heat-conducting area between all the single cells or supercapacitors; the outer surface of the battery module The surface is covered with a heat-conducting insulating layer, and the outer surface of the heat-conducting insulating layer is covered with a fixed heat-conducting plate, and the fixed heat-conducting plate is fixedly connected to a fixed heat-conducting bracket embedded with a heat-conducting channel for exchanging heat with the outside world. The fixed heat conduction bracket is arranged between the battery module and the battery module in the battery pack casing and between the battery module and the battery pack casing. The invention has the beneficial effects of uniform temperature field, high heat dissipation efficiency, safety and reliability, compact structure, low cost and high specific energy of the battery pack.

Description

technical field [0001] The invention relates to a battery pack for an electric vehicle. Background technique [0002] The existing battery packs for electric vehicles, according to the load requirements of electric vehicles, are composed of multiple single cells or super capacitors connected in series and parallel to form modules, and then multiple modules are connected in series and parallel to form a battery pack with a certain voltage and capacity, which are placed in a sealed box A battery pack is formed in the body. The battery pack in the battery pack will generate heat during charging and discharging. If the heat cannot be dissipated in time, it will affect the use of the battery pack and shorten the life of the battery pack. Due to the poor low temperature performance of the battery, the electric vehicle cannot be used normally or the mileage is short, especially when it is charged at low temperature, which directly affects the life of the battery. [0003] Usually...

AI Technical Summary

Problems solved by technology

[0004] Existing large-capacity square or soft-packed batteries have a serious problem of uneven temperature field, and at the same time, the heat dissipation area is limited. With the use of air-cooled devices, the wind resistance of the heat dissipation channel is large and uneven, the heat dissipation energy consumption is large, and the heat dissipation effect is not obvious; the existing battery pack The liquid cooling device is adopted, and the cooling device runs through the battery, which not only increases the cost, reduces the specific energy, increases the difficulty of insulation, but also causes the hidden danger of the safety of the lithium battery pack caused by the reliability of the cooling device; the existing thermal control device basically conducts heat through convection , or through loose contact conduction, the heat conduction efficiency is low and uneven; the existing heat control device uses heat conduction glue and heat conduction oil between the single batteries, but the process is complex, the specific energy is low, the reliability is low, and maintenance is difficult and high cost

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