Protection against battery discharge. Custom Li-ion powered design.
Good day. This year I have completed a project that I have been thinking about for a long time.
It is an electronic protection of the lithium-ion battery (3s 12 V) against excessive discharge and, consequently, against permanent damage. The whole is in the form of a printed circuit board with a multi-turn potentiometer to adjust the operating voltage. The exact diagram and principle of operation are presented in this episode.
Comments
Hello What immediately catches the eye - the use of through-hole components instead of SMD. It is a pity, the board could be smaller and much simpler. There are also a lot of tall elements, which also... [Read more]
Of course, the circuit could be on SMD elements, but for now I'm at the design level on THT elements. The thermistor could be added by adding one more TL431 chip with a few resistors to the project.... [Read more]
With all due respect, building such a system is actually pointless in my opinion. There are ready-made "hardware secondary protection" circuits, which are tiny, quite cheap, with a handful of small elements... [Read more]
PLN 30? As I checked a month ago, the delivery itself cost about PLN 45 - PLN 60. What shipping option have you chosen that the costs are so low? greetings AND. [Read more]
It has become a bit more expensive recently. I paid $ 12.66 for 10 100x100 tiles at the end of September, which is about PLN 50 at today's rate. Shipping $ 7.66, or about PLN 30. As of today, the cheapest... [Read more]
On the other hand, you can build a protection system from a handful of small elements (6-7), where the largest is the mosfet that cuts off the power supply. Somewhere after this forum there is a protection... [Read more]
Without a balancer? The cells in the package will be consumed quickly. [Read more]
@ RAF96 the plates were made very nicely and if you want to make them in THT technology, do them. I hope that someday you will start making projects in SMD technology. [Read more]
Active balancer will be added, it came yesterday, no problem to apply it. @krzysiekkrm If we give up the light that lights up when the protection is connected to the battery, this current will drop even... [Read more]
It's nice that someone else does something on their own. I used to like to design and do these things myself. Now, in the era of Chinese bms modules with a 3s balancer for PLN 7 on ali and PLN 15... [Read more]
Just here THT is very well designed. I don't see the need for SMD everywhere. If the author wanted to do a spider and pour resin over it, that's great. [Read more]
And do a security greater than the package itself, because there is no need to push smd? A completely pointless approach. If there were to be a bms and a charger there, maybe, but such a size is absolutely... [Read more]
Are we still talking about amateur projects? I don't think it matters here. [Read more]
Does amateur mean that it should have no utility and may not be thought out? A bit of logic in that. As an amateur, you can do something really cool that can be used normally. Reduce a bit, a little smd... [Read more]
The main purpose of the protection circuit is not to protect the battery from under-voltage (UV) conditions. Li-ion battery protection is mainly used for over-voltage (OV) protection during charge and... [Read more]
The fuse, located right next to the basket with cells, protects against short-circuit and the flow of too much current. [Read more]