A battery management system real-time clock synchronization circuit and method thereof

Abstract

The invention discloses a real-time clock synchronization circuit of a battery management system and a method thereof, wherein the circuit includes a battery management module, a main controller module and an external communication interface module, and the battery management module, the main controller module and the external communication interface The modules are sequentially connected in the form of a bus, wherein the battery management module is used to uniformly control and manage multiple strings of batteries in the battery pack, and the main controller module is used to control and manage the overall clock monitoring circuit. The external communication interface module is used to provide an information exchange channel for time synchronization with external devices. The real-time clock synchronization circuit of the battery management system proposed by the present invention does not need to add an additional onboard battery to power the clock chip, and the clock chip adopts a distributed arrangement to improve the timing accuracy of the clock chip and the clock self-synchronization alignment function.

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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