Multi-host communication method and device for battery management system based on level migration

A communication method and a technology of a communication device, which are applied in transmission systems, digital transmission systems, data exchange through path configuration, etc., can solve the problem of the time and temperature of light-emitting diodes that can only transmit signals in one direction, and the digital isolator is expensive, The problem of limited transmission speed of optocoupler can achieve the effect of reducing the space and the number of chip pins, reducing the occupied space and using fewer components

Active Publication Date: 2017-07-14
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, these solutions have the following disadvantages: 1. The optocoupler has limited transmission speed, high power consumption, can only transmit signals in one direction, and the light-emitting diode is susceptible to aging due to the influence of time and temperature; 2. The transformer is large in size and has electromagnetic radiation; 3. , Digital isolators are expensive, and each interface requires a digital isolator, and the scalability is weak

Method used

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  • Multi-host communication method and device for battery management system based on level migration
  • Multi-host communication method and device for battery management system based on level migration
  • Multi-host communication method and device for battery management system based on level migration

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Embodiment 1

[0044] Such as figure 1 As shown, a multi-host communication device for a battery management system based on level shift includes a main controller responsible for battery management algorithm calculation, a battery management chip responsible for battery pack data collection, and a level shift module.

[0045] In this device, a battery management chip monitors the battery parameters of the 4 cells, and the battery management chip transmits the collected cell information to the main controller through TWI (Two-wire Serial Interface) communication. Let it estimate the state of the battery and get the current state of the battery pack. Such as figure 1 As shown, multiple battery management chips are required to manage the batteries after being connected in series. In theory, n can be any integer greater than 0, but due to the limitation of the 7-bit address of the TWI communication method, the communication network based on this level shift method can be up Allows 128 chips to...

Embodiment 2

[0054] Using the TWI multi-master communication mode (non-master-slave mode), the master controller and the battery management chip have the same authority, both belong to the master on the TWI bus, and there is no concept of master polling cycle, as long as the battery management chip finds If there is an abnormal situation, you can immediately upload data to the main controller through the bus. If two or more hosts initiate data transmission at the same time, ordering of communication tasks is achieved through priority arbitration.

[0055] The communication mode in this embodiment is TWI communication, which is a two-wire communication protocol used for serial communication between integrated circuit chips. It connects the chips that need to communicate through two lines of SDA and SCL to form a communication network, and identifies each device according to the address. Since the devices connected to the communication line are in a "wire-AND" relationship and can realize m...

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Abstract

The invention discloses a multi-host communication method and device for a battery management system based on level migration. A TWI multi-host communication mode is adopted. A main controller and a plurality of battery management chips have the same permissions and all belong to the hosts on a TWI bus. As long as the battery management chips find abnormal circumstances, data can be immediately uploaded through the bus to the main controller. If two or more hosts upload data at the same time, communication tasks are sorted through priority arbitration. The device includes a main controller for battery management algorithm calculation, a plurality of battery management chips for battery data collection, and a plurality of level migration modules. The level migration modules implement the effect of level shift. The method and device according to the invention allow the battery information to be uploaded to the main controller in a timely manner through a bi-directional transmission signal, and are more conducive to the diagnosis, protection and maintenance of a faulty battery.

Description

technical field [0001] The invention relates to the technical field of automotive electronics and automotive communication, in particular to a multi-host communication method and device for a battery management system based on level shifting. Background technique [0002] In the face of increasingly serious problems such as energy shortage and environmental pollution, the development of new energy vehicles is an effective way to alleviate the pressure of energy conservation and emission reduction, and new energy vehicle technology has been highly valued. [0003] Since the voltage and energy of a single battery are not enough for electric vehicles to run, the power supply of general electric vehicles is connected by many batteries in series, which requires a special battery management system (Battery Management System, BMS) to monitor the battery. The battery management system is an important part of the battery system. It obtains the current battery status through online mo...

Claims

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Application Information

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IPC IPC(8): H04L12/413H04L12/40H04B3/04
CPCH04B3/04H04L12/40143H04L12/4135Y02T90/16
Inventor 欧奔肖兵肖斌
Owner SOUTH CHINA UNIV OF TECH
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