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Functions of Battery Management System

Do It For Me
Monday, 02 August 2021 / Published in Do IT For Me

Functions of Battery Management System

Functions of a Battery Management System for Electric-Powered Cars

  • Battery safety so one can save you operations out of doors its secure running area.
  • Battery tracking via way of means of estimating the battery State of Charge (SoC) and State of Health (SoH) all through charging and discharging.

If the voltage on the enter pin isn’t always a gift then BMS determines the burden attaches itself and it activates the discharging FET. In BMS cell balancing is responsible for its functioning.

Functions of Battery Management System

Source

Types of Cell Balancing

  • Passive cell balancing 
  • Active cell balancing 

In Passive cell balancing, the pass resistors are used to discharge the extra voltage and equalize with different cells.

In the Active cell balancing the extra fee of 1 cell is transferred to some other cell that has a low fee to equalize them. It makes use of fee storing capacitors and inductors.

Functions of Battery Management System

Source

 

Functions of Battery Management System (BMS)

1. Safety Due to the better density of lithium-ion battery packs

There may be an extended hazard of catching fire. So as stated earlier, it’s far crucial to function batteries at rated value. A BMS does these paintings for you. It avoids over-charging and over-discharging of the battery % to increase the battery lifestyles. It additionally gives short-circuit protection, charging and discharging over modern-day protection, anti-opposite charging protection, etc. Modern BMS gears up with Bluetooth and UART communications.

2. Battery Performance Optimization

For a battery to carry out at its best, it functions someplace among the most and minimal rated values, i.e. modern-day, voltage, temperature, etc. As we found out earlier, a BMS allows batteries to function inside those vital rated values. In the case of the battery packs, it allows for preserving identical charging and discharging of the cells. This vastly improves the overall performance of the battery %. Not simplest overall performance however a green Battery Management System is beneficial in enhancing the lifestyles of the battery packs.

3. Health Monitoring and Diagnostics

The charge level of a battery determines the charging and discharging time. A BMS can calculate and indicate the charge withinside the battery.

A BMS tests for the oddity withinside the battery parameter with the aid of using evaluating them with rated values. Also, it’s far able to take corrective moves to boom the fitness of the battery.

Functions of Battery Management System

Source

Secondary Capabilities of (BMS) Battery Management System

  • Balances all of the cells withinside the battery % with the aid of using intelligently bleeding off extra strength from cells which we can charge greater than others. This affords the most quantity of usable strength (capacity) from the battery % because the % is simplest as sturdy because of the weakest cell.
  • Monitors the temperature of the battery % and controls a battery fan to alter the temperature of the %. Additionally, it continuously videoes displays units the output of the fan to make certain it’s far operating properly.
  • Provides real-time statistics and values to different gadgets which include motor controllers, chargers, displays, and facts loggers the use of numerous exceptional strategies (CANBUS, analog outputs, and virtual outputs). Stores mistake codes and complete diagnostic statistics to resource in solving troubles with the battery % have to any problems arise.

Source

Impedance spectroscopy

In an EIS, an AC modern-day functions in the battery, and the voltage reaction to the modern-day, namely, the amplitude and the phase, will then record. By the complicated department of AC voltage with the aid of using AC modern-day, the impedance is obtained. These approaches are repeated for exceptional frequencies, and the residences of the battery’s incomplete variety frequency are obtained.

The dynamic conduct of batteries activates and records itself with the aid of using the EIS take a look at, which offers a particular impedance size in a huge band of frequencies. The EIS takes a look at measures the nonlinearities, in addition to very gradual dynamics directly, as a result, it’s far taken into consideration a unique device to research battery dynamics.

Source

Existing strategies for the State of charge estimation 

Many SOC estimation strategies suggest the ampere-hour approach, the OCV approach, the model-primarily based totally approach, and so forth. The ampere-hour approach is straightforward and smooth to put in force for the calculation of battery SOC for it takes benefit of the definition of SOC. However, it desires a previous understanding of preliminary SOC and suffers from accrued mistakes of noise and size mistakes.

The OCV approach takes benefit of the positive courting among SOC and SOC and takes into consideration its efficiency also.  However, acquiring the OCV desires an extended relaxation time. As a result, it’s far tough to use in real-time applications. Intelligent algorithms, which include fuzzy logic, synthetic neural networks, and so forth, had been studied to estimate the SOC.

Due to the effective cap potential to approximate nonlinear capabilities, those strategies can regularly achieve a terrific estimation of SOC. The connection to masses manages itself via electromagnetic relays known as contactors. The precharge circuit may be both electricity resistors link themselves in collection with the masses till the capacitors charge themselves.

Source

Conclusion

A BMS functions as a precharge gadget permitting a secure manner to attach the battery to exceptional masses and getting rid of the immoderate inrush currents to load capacitors.

To sum up, a battery management system (BMS) is a must in every lithium-ion battery, especially for those used in electric vehicles.

SOURCES

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Tagged under: active cell balancing, amphere hour, cell balancing, impedance, lithium-ion, OCV, passive cell balancing, SOC, SOH

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1 Comment to “ Functions of Battery Management System”

  1. Lithium-Ion Batteries in Electric Vehicles - DoItForMe Tech Community says :Reply
    August 3, 2021 at 3:53 pm

    […] For more articles, CLICK HERE. […]

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