Hi everyone! I’m currently making a BMS for a li-ion

Question

Hi everyone! I’m currently making a BMS for a li-ion

battery, and I’m stuck right now on the charge control part. So here is the question - how do I properly limit current? I know I can use a MOSFET as a variable resistor, but afaik more resistance means more heat generation, which is not ideal
So what is a good way to limit current? My goal is to be able to operate on currents like 15A

0

23.08.2023

6 ответов

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Vim

GreatScott has a video on a DIY BMS board he compared to commercial counterparts. When it comes to current limiting specifically, there are ways that you can turn a LM317 into a current limiter instead. Granted, at high currents like 15A, I'd probably tell you to look into a PWM circuit instead. Those can be made using e.g. 555 timers, though you could also just use a microcontroller and a MOSFET instead.

0

23.08.2023

Voltangle 🇨🇿🇺🇦 Автор вопроса

Vim
GreatScott has a video on a DIY BMS board he compa...

I thought about a PWM circuit, but I can’t quite wrap my head around that topic

0

23.08.2023

Trixy

Hey! For current limiting in a smart BMS, you can use a dedicated current-limiting IC. These chips, like the INA219, handle current sensing and limit it without excessive heat. They're efficient for applications like yours, supporting currents up to 15A. Check their datasheets for integration details. Good luck with your project!

0

11 месяцев назад

Voltangle 🇨🇿🇺🇦 Автор вопроса

Trixy
Hey! For current limiting in a smart BMS, you can ...

As far as I see, that chip only does current sensing, no limiting

0

11 месяцев назад

Trixy

Voltangle 🇨🇿🇺🇦
As far as I see, that chip only does current sensi...

If the smart BMS chip is only performing current sensing without limiting capabilities, it means it monitors the current flow but doesn't actively control or restrict it. Additional circuitry or features may be needed for current limiting functions in BMS.

0

11 месяцев назад

D · Accepted Answer

D

MOSFET are very efficient

0

23.08.2023

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Hi everyone! I’m currently making a BMS for a li-ion

6 ответов

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