Extended-range battery pack system of battery electric vehicle

Abstract

The invention provides an extended-range battery pack system of a battery electric vehicle, and relates to the technical field of battery electric vehicles. The extended-range battery pack system of the battery electric vehicle comprises a main battery system and an extended-range battery pack system which are connected in parallel through a high-voltage switch, wherein the extended-range battery pack system adopts a voltage platform, and a battery model and the number of designed strings of the voltage platform are the same as those of the main battery system, so that the voltage platform is matched with the main battery system; and the extended-range battery pack system is configured with auxiliary management boards, and the auxiliary management boards are used for collecting voltage and temperature of each battery pack in the extended-range battery pack system, uploading data to a BMS (battery management system) mainframe of the main battery system, performing computation and judgment in the BMS mainframe, controlling the high-voltage parallel-connection switch and managing inputting and removal of the extended-range battery packs. The battery electric vehicle is powered by the battery packs at ordinary time, and keeps higher energy conversion efficiency; and when farther travelling is required, the extended-range battery pack system can be mounted at any time, due to the smaller configuration capacity of each extended-range battery pack, the vehicle cannot be driven by the extended-range battery pack system independently, and accordingly, the original battery packs and the extended-range battery packs are connected in parallel to supply power to the vehicle.

Description

technical field [0001] The invention relates to the technical field of pure electric vehicles, in particular to a range-extending battery pack system for pure electric vehicles. Background technique [0002] At present, automobiles have become an indispensable means of transportation in people's life and work. At the same time, problems such as oil crisis, environmental pollution, and air haze have also plagued people's lives. Therefore, the development and research of new energy vehicles has become a hot spot in the development of the automobile industry. The advantages of pure electric vehicles with zero emissions and low operating costs have become one of the key development directions for new energy vehicles. [0003] The disadvantages of current pure electric vehicles: short mileage, inconvenient charging, high vehicle price, restricting the promotion of pure electric vehicles. The cruising range can be increased by increasing the capacity of the battery pack. One of t...

AI Technical Summary

Problems solved by technology

[0003] However, the current disadvantages of pure electric vehicles: short mileage, inconvenient charging, high vehicle price, restricting the promotion of pure electric vehicles

The cruising range can be increased by increasing the capacity of the battery pack. One of the solutions is to greatly increase the energy density of the battery. At this stage, pure electric vehicles mostly use lithium batteries as the power source, and in a short period of time, they rely on greatly increasing the energy of lithium batteries. It is still very difficult to solve the problem of short mileage of electric vehicles due to density

The second solution is to increase the number of batteries, and the design of the battery pack is limited by the design of the vehicle and other restrictions, so that a larger capacity cannot be designed

[0004] When a pure electric vehicle is designed to have more cruising range, it needs to configure a battery pack with a large capacity. The positioning of pure electric vehicles is mainly for urban transportation and short-distance driving, and a large-capacity battery pack will increase the weight of the vehicle. At the same time, the vehicle body is limited and the cost is limited. , are not good solutions

However, when the designed cruising range is within 200km, pure electric vehicles cannot meet the demand when a long-distance travel is required.

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