What Is SoF In Battery, State Of Function, Methods, Purpose

June 25, 2020January 7, 2023 CS Electrical And Electronics

Hello guys, welcome back to our blog. Here in this article, we will discuss what is SoF in battery (state of function), methods to estimate the state of function in battery, and why SoF estimation is required.

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What Is SoF In Battery

The growth and overall utilization of electric vehicles (EVs) is an essential energy-saving and emission removal step in the domain of transportation, which has been supported by numerous countries and considerable global automobile companies.

The conventional combustion engine established automobile industry is slowly transitioning to EV and HEV or hybrid electric vehicle standards. EVs that take benefit from renewable sources of electricity have been widely acknowledged as important transitional technologies for following-generation transportation.

The power battery pack is an important element of Electric vehicles and is key to the victorious application of EVs. The benefit of (LPBP)s Lithium-ion Power Battery Packs, which have increased energy-to-weight proportions and prolonged working lives, as Electric Vehicle power sources have evolved into an irreversible movement and significant research direction.

Nevertheless, due to the physical and chemical aspects of LPBPs, Battery Management Systems (BMS) are necessary for the arrangement of battery state managing, thermal management, energy managing, and safety management in the lithium-ion battery pack system.

The BMS (battery management system) should stop over-charging or over-discharging under all working requirements spread the cycle life and rescue the lithium-ion battery pack from endless damage, thereby enabling its safe and efficient charging and discharging.

The state variables of lithium-ion battery pack possess direct measurement variables and indirectly computed variables, most of them utilized to explain a special lithium-ion battery pack characteristic.

Nevertheless, if the lithium-ion battery pack is to be estimated completely, the state-of-function (SOF), which can be described as the operating state of the lithium-ion battery pack under precise constraint situations, has special importance. The evaluation of the state of function or SOF is one of the most essential functions of the battery management system (BMS).

Why SoF (state of function) estimation is needed?

The idea of a SOF tailored to the needs of a given application was submitted. In some circumstances, none of the battery-pack state variables, including state of health (SOH), state of charge (SOC), and voltage, can convey to the system, whether or not the battery completes the needs of the assigned application under actual working conditions.

The state of function or SOF is an added figure of value or a set of sculptures of value that delivers details about the ability of the battery to achieve a specific task which is a needle of the functionality or trustworthiness of the system.

Therefore, state of function or SOF conveys jointly the battery state parameters and conditions of a given application. The CS Electrical And Electronics will assume that no public meaning of the state of function or SOF can be made; nevertheless, it can be specified for certain applications.

How to estimate the SoF (state of function)?

The state of function or SOF is described as the process of evaluating the functionality emanated or derived from the transient conduct. Two types of SOF (state of function) are especially elaborated in conjunction with the current-voltage connection curves.

We think that the battery management system or BMS can utilize this fact to adjust its approach, and the state of function or SOF is connected to the mixture of SOH, SOC, and temperature. Nevertheless, the transient manners of the battery with a predefined mix of SOH, SOC, and temperature is not unusual since the conduct will be further, for example, after a time of rest.

The analysis demonstrates that when the dynamic manners can be indicated accurately and the sensual behavior associated with distinct events is understood, this data can be utilized as an intake for battery management or BMS.

It is highlighted that the state of function or SOF is a digital yes or no parameter saying whether the battery pack has sufficient power ability to carry out a selected function (e.g., powering the motor or engine starting).

It utilized the rational values “0” and “1” to convey “no” and “yes”, respectively. If the current voltage is more extensive than the preset voltage, the state of function or SOF is equal to “1”, which indicates that the power need is met; otherwise, the SOF is similar to “0”. The state of function or SOF was described utilizing the next equation related to the overhead logical-variable description:

where P describes the power provided by the battery, P_demands reveals the power demand, and the Pmax reveals the maximum power that can be provided (while the SOC and SOH are “0”, and the working temperature is constant).

The state of charge SOC is always utilized to describe the current state of a battery’s charge, while the SOH is employed to explain the aging conditions of the battery compared to a fresh one. Nevertheless, when we require to characterize the battery pack function state for exact constraint conditions, the state of function or SOF is the most suitable choice.

Therefore, the study of the state of function or SOF has particular importance owing to its academic and applicable value in estimating the battery pack. The latest method to estimate SoF is the Fuzzy Logic Control Algorithm (FLCA).

The FLCA as an intellectual control algorithm utilized for estimating the SOF has an essence. Some specific situations from observed and simulated data is needed to explore the usefulness and importance.

This was about “What Is SoF In Battery“. I hope this article may help you all a lot. Thank you for reading.

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