Mosfet getting really hot

[littlebill]

So i am very confused and now stuck at a crossroad.

I am building a powerbank system that uses a 2s2p liion with dual bms's to run a set of boost converters to get to 12.4v

I purchased. IRLB4132 due to the low RDS on value, or so I thought.

When pushing 10A through this IRL (max amperage for design) with a gate to source 1M resistor, and a 10ohm, gate resistor (to deal with ringing?)

This thing is getting over 250F in ambient according to my thermal camera.

I don't understand what I did wrong. I looked at various mosfets for BMS, that are tiny compared to this thing, and are barely getting over ambient (my 8A bms's barely get warm)

what am i doing wrong.

https://www.aliexpress.us/item/3256807388204026.html?spm=a2g0o.order_list.order_list_main.65.13701802M6blkN&gatewayAdapt=glo2usa

[edavid]

I don't understand what I did wrong.

If you bought them on AliExpress, there could be anything inside the package.  Most likely it is a much smaller and cheaper part that has been remarked.

However, what is the V_GS?

[littlebill]

based on the offical data sheet.

RDS(on) max
(@ VGS = 10V) 3.5 m
(@ VGS = 4.5V) 4.5 m

but even if that was the case, why is it the bms module which cost me a whopping 81c, is not even warm passing close to the same current?

[edavid]

based on the offical data sheet.

RDS(on) max
(@ VGS = 10V) 3.5 m
(@ VGS = 4.5V) 4.5 m

No, I mean what is the measured V_GS in your circuit?

but even if that was the case, why is it the bms module which cost me a whopping 81c, is not even warm passing close to the same current?

Please post your schematic.

[littlebill]

To close this out since I asked for the post to be deleted.

The Mosfets were fake. I ordered a set from Mouser with 1.5mohm RDS, I went from 295F at 10A to 5 degree's over ambient.

[eTobey]

No, dont delete it! Its valueable information for others!

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