High-capacity lithium batteries tend to make everything in life better. No longer must you interact with your fellow human beings if your car battery goes flat in the carpark.

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You can jump the car yourself, with a compact device that fits in your glovebox. [Big Clive] decided to pull one apart and peek inside, and it’s quite the illuminating experience. The first thing to note is there is almost no protection at all for the lithium battery inside. The output leads connect the lithium pack inside directly to the car battery, save for some diodes in series to prevent the car’s alternator backcharging the pack.

[Clive] demonstrates this by short circuiting the pack, using a copper pipe as a test load to measure the current output. The pack briefly delivers 500 amps before the battery gives up the ghost, with one of the cells swelling up and releasing the magic smoke. The teardown then continues, with [Clive] gingerly peeling back the layers of insulation around the cells, getting right down to the conductive plates inside.

It’s a tough watch, but thankfully nothing explodes and [Clive]’s person remains intact. If you’ve never seen inside a lithium cell before, this is a real treat. The opened pack is even connected to a multimeter and squeezed to show the effect of the physical structure on output. It would be interesting to compare various brands of jump starter; we imagine some have more protection than others. Regardless, be aware that many on the market won’t save you from yourself. Be careful out there,.

Video after the break. • • • • Posted in Tagged,,,, Post navigation. BigClive is an idiot. “I wonder what kind of protection there is”.

Of course there is none! The lithium cells are say 3Ah and hopefully 40C so can safely handle about 120A. Noti iz filjma garri potter dlya fortepiano. Starting a car is a 200-300A nominal business.

So where do you put your current limit? Set the limit at 120A and the car won’t start.

Set the limit at 200 and some cars will start. Set the limit at 300A and you don’t get any protection. What’s the use? Then implementation. Say your current limit and/or over-discharge circuit has a 2mOhm resistance.

You’ll be getting 400mV or 80W of heat in the circuit. Where are you going to leave that waste heat?

When it’s fully charged, there is about 11V * 3Ah or about 120kJ of energy in the system. If you short circuit that, where is that energy going to go? I’ll tell you the answer: Into heat inside the system. The system will heat up and catch fire.

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