Calculating the State of Health for a Lithium Ion Battery System

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Күн бұрын

A battery's State of Health is critical to understanding how a battery degrades as it is charged and discharged over time. This degradation is caused by the increasing impedance of the cells. This video explains how this is calculated and some easier ways to understand how a Battery Management System monitors and reports this information.
Topics Covered
State of Health
Discharge Cycles
State of Health Capacity
State of Health Impedance
ESR
Estimated Range Remaining
Range Calculations
Battery Capacity Fade Effect
State of health, or SOH, is commonly defined as the total capacity of the battery pack today divided by the total beginning of life capacity, given in units of Amp Hours. We explain how this is calculated by the Battery Management System and why understanding state of health is important for a system. State of health explains the degradation of the battery over a number of discharge cycles.
We also look at State of Health impedance as well as the more common State of Health capacity. Over time, the ESR, or impedance, of the cell will grow. This increasing impedance decreases the state of health. A battery management system looks at both of these calculations to understand how a battery pack ages. This changes how the range of a battery pack is calculate for an electric vehicle.
For more information, visit staflsystems.com

Пікірлер: 34

@boiboi3732 3 жыл бұрын

this guy should be a lector. his explanation is very easy to understand. thank you bro. You deserve more view bro

@dhadumia Жыл бұрын

Thank you for sharing such knowledge! And so crisp and clear explanation!

@tonymunn 3 жыл бұрын

Thank you. My understanding of Li-Ion batteries and BMS' has been greatly increased.

@staflsystems 3 жыл бұрын

Thank you!

@hamidalsaid6474 Жыл бұрын

Phenomenal way of explanation!. Well done Erik

@lindsayshantharubia8671 3 жыл бұрын

You are just awesome!!! The concepts are not just clear but the way you teach also intrigues me to learn more from you, !!

@jws3925 3 жыл бұрын

This video series is excellent! Thank you for producing them. I did a little research on the products you offer and it appears you are most geared towards larger system such as those found in EV and large scale off site situations. Since my solar system is very small in comparison (remote cabin) I don't think any of your products would be appropriate. However, the knowledge from these videos is really valuable. I am presently using an Overkill BMS and, so far so good but it appears your BMS products are a completely different "animal."

@ncm122 3 жыл бұрын

Very informative and easy to understand

@hardhikk5938 3 жыл бұрын

this is really very helpful thank you.....!

@ketanpatel4799 Жыл бұрын

very well explained and informative.. thanks

@Phemakorn Жыл бұрын

Thank you so much. It's clear.

@KPsCoaching-sv6pw Жыл бұрын

Excellent.... Very informative video....

@mouncefsenhaji8205 3 жыл бұрын

You are the best ! thank you so much ! Any videos about the kalman filter ?

@robertobasf 3 жыл бұрын

Hi, how the vehicle calculate the ESR along the time to evaluate the SOH?

@vtorsi610 4 жыл бұрын

If the 70% SOC is measured in units of amp-hours then you would have LESS THAN 112 miles ( = 160 miles x 70% SOC ) remaining, due to the lower voltage and therefore lower energy. Whereas, SOC(energy) would be ~112 miles, until "empty" ...

@awh243 8 ай бұрын

THANKYOU SIR

@bharathsk2007 Жыл бұрын

Is it possible to measure the temperature of battery cell with the help of measured internal impedance of the battery? EIS method

@whoknowswhodoesnt 7 ай бұрын

This explanation is superb, thank you. And could you please elaborate on how one can measure the actual battery capacity, for example of an electric car?

@ncm122 3 жыл бұрын

I hope you can create a video, on recommending when to change a 12v lead acid battery. what is the critical SOH threshold that i can still charge my car battery and stretch my wallet further before i change a new car battery

@sohailansariadvocate 2 жыл бұрын

impressive

@mikkaeldunlop1291 5 ай бұрын

Sir Erik, how did you derive the 160Miles from the current max range I am a little bit confused? Can you help?

@michaelgap1 Жыл бұрын

In another video you go into details of SOC(capacity) and SOC(energy). Wouldn't this distinction also be important here? What is the relationship of SOH(c) to SOH(e)? And just multiplying 70% SOC(c) with the remaining range seems like a mistake due to the same effect. Could you explain it here as a comment? Thank you!

@pavletrubajic5269 11 ай бұрын

well he took soh into consideration,you would have to calculate the soh first in order to get the right results,think of it as a relationship between soh and soc,soh is the first thing to calculate and with that result you go on into calculation with soc,he couldnt multiply the 160 iles with 70% if he didnt get those 160 by calculating the soh first,you need the soh to get the soc or range remaining whatever it is, so its not a mistake,maybe you were confused with the soc telling it was 70% and it wasnt labeled as energy or capacity, idk i hope i helped

@sureshkumar-cc1jq 2 жыл бұрын

Great Work Sir, God bless for you time spending to explain the concept. Please apply Kalman filter and show the estimated range of drive.

@waleedaftab4464 7 күн бұрын

I have a Li-ion battery say 10AH. How can i estimate its state of health. is this possible, then how?

@earnmoney5219 Жыл бұрын

Good

@focusdreamsmyself.1232 Жыл бұрын

How to know SOH % Calculation?

@virtualdrive8619 3 жыл бұрын

Am I the only one here who feels that Stafl looks like 'Bruce Banner' from the movie 'The Incredible Hulk' ? :)

@mayurbalwani7277 3 жыл бұрын

Nah. Looks like a Lite version of Tom Cruise! 😂

@PavolFilek 8 ай бұрын

SOH for capacity and for impedance is not one static value. If you have temps. range -15 - 60 *C and capacity 300 Ah and you want to calculate SOH, you have to calculate / 60 - ( -15 ) x 300 === 22500 point LUT / look up table /, because for each SOC and temp, impedance is different number.