Battery Management System(4)

 

Battery Management System(4)

 

BMS Data Acquisition

Let’s examine the above feature block from its center. The number one function of the BMS is to reveal the Battery for which it wishes to measure three essential parameters which include the voltage, modern and temperature from every cell in the battery p.C.. We realize that Battery  fashionbeautypalace   packs are fashioned via connecting many cells in series or parallel configuration, just like the Tesla has eight,256 cells wherein ninety six cells are linked in collection and 86 are linked in parallel to form a %. If a set of cells are linked in collection then we have to degree voltage across every cellular however contemporary for the complete set might be same seeing that  techgeeksblogger   current can be identical in a chain circuit. Similarly while a fixed of cells are connected in parallel we need to measure only the complete voltage since the voltage across each cell might be equal when connected in parallel. The beneath picture indicates a fixed of cells related in series, you can notice the voltage and temperature being measured for person cells and percent cutting-edge is measured as an entire.

“How to degree cellular voltage in BMS?”

Since a standard EV has a big quantity of cells connected collectively,  triotechdigital   it is a chunk tough to measure the person cellular voltage of a battery p.C.. But best if we know the person mobile voltage we will carry out cell balancing and offer cell safety. To read the voltage price of a cell an ADC is used. But the complexity involved is excessive since the batteries are linked in series. Meaning the terminals across the voltage is measured must be modified each time. There are many approaches to try this concerning relays, muxes and so forth. Apart from this there may be additionally some battery control IC like MAX14920 which may be used to measure man or woman cell voltages of multiple cells (12-16) connected in collection.

“How to measure mobile Temperature for BMS?”

Apart from cellular temperature, from time to time the  computertechreviews   BMS also need to degree the bus temperature and motor temperature considering everything works on a excessive modern-day. The maximum common element used to measure the temperature is called a NTC, which stands for Negative temperature Co-efficient (NTC). It is much like a resistor but it adjustments (decreases) its resistance based on the temperature around it. By measuring the voltage throughout this tool and by means of the usage of a easy ohms law we are able to calculate the resistance and for that reason the temperature.

Multiplexed Analog Front Finish (AFE) for Cell Voltage and  techwadia. Temperature Measurement

Measuring mobile voltage can get complicated since it requires high accuracy and might additionally inject switching noises from mux aside from this each cellular is attached to a resistor thru a transfer for cell balancing. To triumph over these troubles an AFE – Analog Front give up IC is used. An AFE has integrated Mux, buffer and ADC module with excessive accuracy. It should effortlessly measure the voltage and temperature with not unusual mode and transfer the facts to the primary microcontroller.