What BMS Chipset Do I Need? | BMS Design Series Part 03.1 | Battery Managment System
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- เผยแพร่เมื่อ 31 พ.ค. 2024
- In this video, we discuss the different types of BMS chipsets. This is part 03, segment one of the chip set subject.
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#battery #pcb #engineering #bms - วิทยาศาสตร์และเทคโนโลยี
Amazing an interesting video,
I just encountered a new issue on my battery-powered hardware. when the battery is first inserted, the battery holder springs create a series of loose contact phenomenon (similar to a switch debounce). The protection IC doesn't immediately see the battery voltage at its full value but a sequence of pulsating values instead. The battery protection IC interprets this as an over-discharged situation and therefore disconnects the battery from the rest of the circuit to prevent draining the battery further and making recharging impossible. I have confirmed this by probing the control pin that's responsible for the over-discharge pass FET. This happens randomly and is very seldom though. To reset the IC, plugging in the charger even just for a while will do the trick as mentioned on the datasheet. This problem wasn't anticipated during the design phase and I haven't even found a single discussion of this on the internet - might be a first of its own. My solution is to delay the power up of the protection IC using a larger capacitance on its VCC until the battery voltage stabilizes. Perhaps a small cap across the battery negative and system ground will bootstrap it also.
i also did a functional tester that tests the charging of a single 18650 batt at the nominal, overcharged, and overdischarged conditions. but instead of using an actual battery on the jig, i used an adjustable buck converter with different voltages to emulate those three conditions. i forgot to consider the battery profile (CC/CV) and it doesn't work. any tips to emulate the battery using a buck?
Great content! I'd love to see you design a retrofit BMS with a built-in charger and a USB-C PD port. I see no reason for standalone tool battery chargers for home use nowadays. Just plug in a 20V-capable USB-PD laptop charger and go. Heck, even in professional tools I'm sure it would be appreciated if the tool could be easily recharged from the 12/24VDC cigarette lighter port in a car using the same adapter as a laptop/phone. Also, I'd probaby refer to your design as a starting point if I'd need to make a device with a 3S pack. Even better if you'd publish your design under something like a CC BY-SA license.
That's an interesting idea. Built in charging might be something worth looking into for a future battery project. I am considering releasing the design as open source on github, but I haven't decided yet.
Please make a tutorial about BQ769x0 AFE Chip BMS System.
That could possibly be a later video series if an application comes up.
@@eetengineer Hopefully soon
Great content
Thanks for watching