Real-time clock synchronization circuit of battery management system and method thereof

Abstract

The invention discloses a real-time clock synchronization circuit of a battery management system and a method thereof. The real-time clock synchronization circuit comprises a battery management module, a main controller module and an external communication interface module, wherein the battery management module, the main controller module and the external communication interface module are connected in sequence through buses; the battery management module is used for carrying out unified control and management on multiple strings of batteries in a battery pack; the main controller module is used for controlling and managing an integral clock monitoring circuit; and the external communication interface module is used for providing an information interaction channel for carrying out time synchronization with external equipment. According to the real-time clock synchronization circuit of the battery management system, which is provided by the invention, additional arrangement of an onboard battery for power supply of a clock chip is not needed and the clock chip is arranged in a distributed manner, so that the accuracy for timing of the clock chip and the clock self-synchronizing alignment function are improved.

Description

technical field [0001] The invention relates to the field of battery management systems, in particular to a real-time clock monitoring circuit and method for the battery management system. Background technique [0002] At this stage, the power battery or energy storage battery system is generally equipped with a battery management system, and in general, the battery system requires the battery management system to have the function of recording the historical faults of the battery system, and accurately record the time when the historical fault data occurs. [0003] At present, the battery management system adopts a solution similar to other traditional electronic control equipment, and uses a combination of a small battery and a clock chip circuit to realize a real-time clock circuit. Among them, the clock chip has many IC-level solutions, and the supporting small battery uses To provide power supply for the clock chip when the battery management system is not working, to e...

AI Technical Summary

Problems solved by technology

[0005] (1) There is a bottleneck in the life of the small battery that powers the clock chip. In applications like industrial or new energy vehicles, it is difficult for such batteries to meet the life requirements of the product

During the use of the product, due to the problem of the battery itself, it cannot provide stable power to the clock chip, causing the clock chip to work abnormally;

[0006] (2) If the battery management system is a part of automotive electronics, the quality level of electronic components is required to meet AECQ standards, and the current small battery products are not as good as traditional electronic components in terms of materials, operating temperature requirements and other conditions. It is suitable to be used alone as an internal device of an electronically controlled power supply, and there are quality risks;

[0007] (3) When the clock chip itself fails, because there is no reference object, it is impossible to accurately judge whether the clock chip is working abnormally

Such failures have adverse effects on the later user experience and system optimization design

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