Battery Management System(3)

 

Battery Management System(3)

 

Galvanic Isolation: The BMS as a bridge between the Battery % and the ECU of the EV. All the records accrued with the aid of the BMS must be sent to the ECU to be displayed at the instrument cluster or at the dashboard. So the BMS and the ECU have to be constantly communicating maximum through the usual protocol like CAN communique or LIN bus. The BMS layout have to be capable of presenting a galvanic isolation between the battery percent and the ECU. techwadia

Data Logging: It is significant for the BMS to have a big reminiscence financial institution because it has to save a whole lot of statistics. Values like the Sate-of-fitness SOH may be calculated only if the charging records of the battery is thought. So the BMS has to song of the fee cycles and price time of the battery p.C. From the date of connection, and interrupt these statistics whilst required. This also aids in offering after income service or analyzing a trouble with the EV for the engineers.

Accuracy: When a cell is being emotional or discharged the voltage across it will increase or decreases regularly. Unfortunately the discharge curve (Voltage vs time) of a Li battery has flat regions for this reason the alternate in voltage may be very much less. This change must be measured accurately to calculate the cost of SOC or to apply it for mobile balancing. A nicely designed BMS ought to have accuracy as excessive as ±zero.2mV but it need to minimum have an accuracy of 1mV-2mV. Normally a sixteen-bit ADC is used in process.

Processing Speed: The BMS of an has to do lots of wide variety crunching to calculate the fee of SOC, SOH and many others. There are many algorithms to try this, and a few even makes use of system getting to know to get the venture performed. This makes the BMS a processing hungry tool. Apart from this it additionally has to degree the cell voltage across loads of cells and note the subtle adjustments nearly immediately.

Building Blocks of a BMS

There are many unique styles of BMS to be had in the marketplace, you may both layout one for your very own or maybe purchase the Integrated IC that is without difficulty to be had. From a hardware shape angle there are simplest three styles of BMS primarily based on its topology they may be Centralized BMS, disbursed BMS and Modular BMS. However the characteristic of those BMS is all comparable. A time-honored Battery Management machine is illustrated below.

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