Battery management system for low-speed electric vehicle

Abstract

The invention discloses a battery management system for a low-speed electric vehicle. The battery management system comprises a master control part and a sampling part, wherein the master control part and the sampling part are communicated with each other; the master control part comprises a central processing unit, a power conversion module, a relay control module, an RS232 module, a system clock, a storage device, a total voltage and insulation detection module, a current detection module, a CAN0 module, a CAN1 module, a CAN2 module and a plurality of isolators; the sampling part comprises a balancing control module, a heat management module, a voltage detection module, a temperature detection module and a CAN module. According to the battery management system, an inner circuit adopts an element dispensing technology and a glue spray technology. The battery management system for the low-speed electric vehicle has complete detection and protection measures for a battery pack, so that the service life of the battery pack is prolonged and management of the battery pack is highly-efficient; each voltage balancing unit in the balancing control module adopts dual redundant design, so that the condition of over discharge of a lithium battery due to failure of a balancing power device is prevented, and the system has strong vibration resistance.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a battery management system for low-speed electric vehicles. Background technique [0002] As a type of new energy vehicles, the development of low-speed electric vehicles in the market is basically the same as that of high-speed electric vehicles. New energy vehicles are mainly based on lithium batteries. Lithium batteries are the main energy source of pure electric vehicles. It achieves perfect management. At present, BMS (battery management system) manufacturers have different technologies. They adopt dual standards for the generation of low-speed electric vehicle BMS and high-speed electric vehicle BMS, and do not pay attention to the performance requirements of low-speed electric vehicle BMS. However, as a travel tool for 4 or 2 people, low-speed electric vehicles actually have stricter requirements on BMS; because the environment of low-speed electric vehicles is...

AI Technical Summary

Problems solved by technology

Therefore, there is no BMS specially developed for low-speed vehicles on the market. The existing BMS for low-speed electric vehicles has a short service life and is prone to batch problems; and the management efficiency of lithium batteries is low, which makes lithium batteries have a short service life. There are security risks

[0004] Passive equalization circuits are currently widely used in BMS. The principle is that the sampling chip transmits the voltage of all monomers to the main control part through communication. Lithium battery cells are each discharged with a power resistor to achieve the effect of balancing the entire battery pack. However, if the equalization circuit or control circuit fails, resulting in a balanced short circuit, it will cause over-discharge of the lithium battery and cause the entire battery pack to be balanced. Not available

[0005] In addition, BMS manufacturers have a very simple management strategy for low-speed electric vehicles. They believe that the use standards of low-speed electric vehicles are low, and they have little consideration for passenger experience, and have not made targeted design for the anti-vibration level of BMS.

Therefore, when low-speed electric vehicles are used on poor road conditions for a long time, the BMS is often easily damaged due to poor anti-vibration ability

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