Battery case and battery pack

Abstract

The invention relates to the field of electric vehicles, in particular to a battery pack casing and a battery pack for pressure balancing of power battery packs and condensation prevention. The battery pack shell is composed of a battery tray, an upper cover, a connector, an explosion-proof vent valve and a seal; the installation surface of the explosion-proof vent valve is provided with a seal, which is installed on the rear end plane of the battery tray and realizes the sealing of the mating interface. The above-mentioned upper cover is installed on the battery tray through the connecting piece, and the sealing piece is used to realize the sealing of the mating interface. The inner cavity of the battery pack shell can only exchange gas with the outside through the explosion-proof vent valve. The explosion-proof breathable valve plays a role of gas exchange to make the air pressure inside the cavity of the rear frame equal to the air pressure outside the battery pack shell. The invention has the advantages of stable performance and low cost.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a battery pack casing and a battery pack capable of balancing the pressure of a power battery pack and preventing condensation. Background technique [0002] In order to ensure the service life and safety of the power battery, the power battery pack installed outside the passenger compartment of the electric vehicle needs to have good waterproof and dustproof performance, and usually a closed space is constructed for the power battery by the shell components and seals; Due to the influence of factors such as cell heating and changes in the external environment of the vehicle during the charging and discharging process, the airtight battery pack needs to breathe with the outside to ensure the pressure balance inside and outside the box, thus ensuring the reliability of the sealing structure; the existing technology generally adopts waterproof and breathable ventilation. The membra...

AI Technical Summary

Problems solved by technology

[0002] In order to ensure the service life and safety of the power battery, the power battery pack installed outside the passenger compartment of the electric vehicle needs to have good waterproof and dustproof performance. Usually, a closed space is constructed for the power battery by the shell components and seals; Influenced by factors such as the heating of the battery cell and the change of the external environment of the vehicle during the charging and discharging process, the airtight battery pack needs to breathe with the outside to ensure the pressure balance inside and outside the box, thereby ensuring the reliability of the sealed structure; the existing technology generally adopts waterproof and breathable The membrane realizes gas exchange inside and outside the battery pack. Although the waterproof and breathable membrane can prevent liquid water from entering the battery pack, it cannot prevent external water vapor from entering the battery pack. When the air humidity inside the battery pack is high, condensation may occur as the temperature of the battery pack decreases. Exposure, which in turn brings corrosion, insulation problems and even the risk of short circuit;

[0003] CN107994181A proposes a venting valve solution with a desiccant, which absorbs water vapor in the battery pack through the desiccant, but needs to detect the state of the desiccant and replace it regularly, resulting in cumbersome operation and high cost of use

[0004] CN211480119U proposes to integrate an evaporator in the breathable valve of the battery pack to dehumidify the gas in the breathing range of the battery pack, which has the problems of complex structure and high cost

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