High voltage distribution box for inside of battery pack of electric vehicle

Abstract

The invention provides a high voltage distribution box for the inside of a battery pack of an electric vehicle. The high voltage distribution box is mounted at the inside of the battery pack of the electric vehicle and comprises a box body and a box cover, wherein the box body is provided with a battery pack total positive terminal, a battery pack total negative terminal, a battery pack output positive terminal, a battery pack output negative terminal, a direct-current fast-charge positive terminal, a direct-current fast-charge negative terminal, a signal control connector, a high-voltage low-current connector, a high and low voltage integrated circuit board, a control unit (comprising a total positive line control contactor, a total negative line control contactor, a direct-current fast-charge positive control contactor, a pre-charge contactor and a PTC (Positive Temperature Coefficient) positive control contactor), a protection unit (comprising a contactor closing state monitoring circuit and a fuse protector), a current sensing unit (comprising a high-precision current sensor IC (Integrated Circuit)) and an overheating alarm unit (comprising a thermistor and an operational IC).The high voltage distribution box provided by the invention is innovated in the aspects of circuit structure, manufacturability, shock resistance, current sensing precision, overheating protection andcontactor closing monitoring, and the space can be saved by 30%.

Description

technical field [0001] The invention belongs to the technical application field of new energy vehicles, and is characterized in that it is a high-voltage power distribution box used in battery packs of new energy electric vehicles. Background technique [0002] The country is vigorously promoting new energy vehicles, and the market share is increasing year by year. As an important part of the electronic control of new energy electric vehicles, high-voltage power distribution boxes are receiving more and more attention. In the past, the high-voltage power distribution box for new energy electric vehicles has the following defects: the circuit is built with copper bars, which takes up a lot of space, it is inconvenient to put it in the battery pack, it needs to be installed externally, the assembly process is complicated and the efficiency is low; the error of the induction coil current sensor is large ; There is no overheating alarm of the high-voltage power distribution box...

AI Technical Summary

Problems solved by technology

In the past, the high-voltage power distribution box for new energy electric vehicles has the following defects: the circuit is built with copper bars, which takes up a lot of space, it is inconvenient to put it in the battery pack, it needs to be installed externally, the assembly process is complicated and the efficiency is low; the error of the induction coil current sensor is large ; There is no overheating alarm of the high-voltage power distribution box, and there are potential safety hazards; the confirmation of the closed state of the main positive and negative line contactor contacts, and the confirmation of the closed state of the contactor's auxiliary contacts cannot accurately reflect the closed state of the contactor's main contacts. There are potential safety hazards; the high-voltage power distribution box has no temperature monitoring, and there are potential safety hazards

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