Lithium battery management system

Abstract

The invention discloses a lithium battery management system, which comprises N voltage acquisition circuits used for acquiring charging and discharging information of a lithium battery cell, wherein the voltage acquisition circuit comprises an analog front-end module and a displacement cache module; each analog front-end module of the N voltage acquisition circuits is cascaded with a micro-controlmodule through the corresponding displacement cache module, the time sequence switching of the voltage acquisition circuits is achieved to perform monitoring and management on each battery cell of the lithium battery, and except for the first-stage voltage acquisition circuit, a level switching circuit is connected between the displacement cache module and the micro-control module of the other voltage acquisition circuits. By using the analog front-end module, the cost is lower than that of the same digital front end on the market, an expensive isolation chip is saved, and the cost is furtherreduced; and a low-voltage control signal is converted into a control signal of a high-end cascade chip through the level switching module, the isolation problem of a high-voltage circuit and a weak-current circuit does not need to be considered, and the high-voltage problem and the failure problem of an isolation chip are avoided.

Description

technical field [0001] The invention relates to the field of battery management, in particular to a lithium battery management system. Background technique [0002] With the rapid development of the new energy industry, the battery management system, which is the main component of the lithium battery, has also developed rapidly. At the same time of rapid development, problems such as battery fire and explosion often broke out, and more and more people have a cautious and skeptical attitude towards the use of lithium batteries. In this regard, the current market has higher and higher requirements for battery management systems. It is necessary to control costs and pursue high performance. It is also necessary to "abstract" batteries into images. A good battery management system must ensure safety and reliability. It is also necessary to prolong the life of the battery, and to make users feel at ease, worry-free, and at ease. [0003] At present, the battery management syste...

AI Technical Summary

Problems solved by technology

[0005] Digital front-end chip cascading solution, the current mainstream smart battery management system solution, this solution uses multiple chips to be cascaded, and then a microcontroller communicates with each chip. It needs to strictly deal with communication isolation and signal isolation issues, and Microcontrollers require relatively rich peripheral resources. In addition, the cost of this solution is high, mainly focusing on digital front-end chips and communication and signal isolation chips.

[0006] The hardware front-end chip cascading scheme is also the current mainstream scheme. Although this scheme is low in cost, it has poor flexibility and extremely low intelligence. For example, it cannot change protection parameters and time, cannot obtain basic data such as battery voltage and temperature, and cannot Compatible with different cell systems, etc., which brings great inconvenience to production material preparation and after-sales service

[0007] In fact, there are many analog front-end chips on the market. These chips only output analog signals to the microcontroller to collect basic data of the battery. Moreover, such chips have obvious advantages in price compared with digital front-end chips, but the current analog front-end chips For single use only

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