Electric vehicle

Abstract

The invention relates to the technical field of electric vehicle driving, in particular to an electric vehicle. Based on a modular battery cell group, a battery management system, a bidirectional energy conversion device and a bus system, independent use and combined use of different battery packs can be realized, the form of the battery pack can be flexibly set, the expandability and the flexibility of the electric vehicle battery system are improved, a user can select and configure the number and model of the battery packs according to requirements, so that the use cost of the electric vehicle battery system can be reduced, waste of battery resources is avoided, the difficulty of electric vehicle charging or battery replacement is reduced, the electric vehicle charging and battery replacement speed is increased, the electric vehicle battery system is more convenient to maintain and overhaul, and the use experience of a user can be improved. In an electric vehicle framework provided by the invention, each battery pack can work independently, plug and play is realized, and idle waste of battery resources is reduced by reasonably configuring the number of the battery packs.

Description

technical field [0001] The present invention relates to the technical field of electric vehicles, in particular to an electric vehicle. Background technique [0002] In the current automobile industry, there are usually two schemes for the battery system of electric vehicles, one is the scheme of the whole high-voltage battery pack; the other is the scheme of series-parallel connection of block-type low-voltage battery packs to form a high-voltage battery pack. [0003] At present, the common high-voltage battery pack is enough to achieve a battery life of about 400km, but the average driving mileage of the car is less than 40km / day, which means that most of the batteries in the whole high-voltage battery pack are relatively idle most of the time, which is invalid The load is heavy, and the charging of the whole high-voltage battery pack takes a long time, the cost is high, and the overall utilization rate is low. In addition, the entire high-voltage battery pack of a repla...

AI Technical Summary

Problems solved by technology

[0003] At present, the common high-voltage battery pack is enough to achieve a battery life of about 400km, but the average driving mileage of the car is less than 40km / day, which means that most of the batteries in the whole high-voltage battery pack are relatively idle most of the time, which is invalid Heavy load, and the whole high-voltage battery pack takes a long time to charge, high cost, and low overall utilization

In addition, the entire high-voltage battery pack of a replaceable electric vehicle must be replaced as a whole, which means that the smallest unit of the backup battery is also a whole high-voltage battery. The load requirements of the replacement equipment are high, and the operation of the replacement machine is difficult.

In order to meet the occasional demand for long cruising range, the solution of the whole high-voltage battery pack has caused idle battery resources, which is a waste of social resources to a certain extent.

[0004] At present, the common block-type low-voltage battery packs are connected in series and parallel to form high-voltage battery packs. In terms of volume and quality, the whole high-voltage battery pack is divided into multiple block-type low-voltage battery packs, which reduces the load requirements of the power exchange equipment. It reduces the difficulty of mechanical operation of the battery replacement equipment, but it still needs to replace all the block low-voltage battery packs at one time, and in order to meet the consistency requirements, the performance indicators such as voltage and power of all block type low-voltage battery packs must be extremely close, which cannot be achieved Plug and play at the single pack level

With the increase of charge and discharge times, the difference between the block battery packs is getting bigger and bigger, which makes it more and more difficult to match the block battery packs.

Since the battery is still replaced by the whole group, the number of spare battery packs cannot be fundamentally reduced, and the effective utilization rate of battery packs is still low, which is still a waste of social resources to a certain extent.

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