I am trying to discharge the battery as fast as possible. what I am thinking of is applying cuk converter to discharge.
Beside that what is the best converter for high-speed discharge, heat management.

+ And I found that there is an Over discharge protection circuit in Litium batteries. How can I disable the protection as a discharge circuit?

 

I am trying to discharge the battery as fast as possible. what I am thinking of is applying cuk converter to discharge.
Beside that what is the best converter for high-speed discharge, heat management.

+ And I found that there is an Over discharge protection circuit in Litium batteries. How can I disable the protection as a discharge circuit?

Welcome to AAC.

What are you trying to accomplish by doing this?

Why are you discharging batteries?
What is the advantage of using a boost converter to discharge batteries instead of a simply resistive load?

Disabling protection doesn't make any sense and is dangerous. The protection circuit is there for a reason, it's not optional. It sets maximum limits for current and voltage to avoid damaging the battery and possible fires and explosions that can result.

 

Welcome to AAC.

What are you trying to accomplish by doing this?

Why are you discharging batteries?
What is the advantage of using a boost converter to discharge batteries instead of a simply resistive load?

Disabling protection doesn't make any sense and is dangerous. The protection circuit is there for a reason, it's not optional. It sets maximum limits for current and voltage to avoid damaging the battery and possible fires and explosions that can result.

Welcome to AAC.

What are you trying to accomplish by doing this?

Why are you discharging batteries?
What is the advantage of using a boost converter to discharge batteries instead of a simply resistive load?

Disabling protection doesn't make any sense and is dangerous. The protection circuit is there for a reason, it's not optional. It sets maximum limits for current and voltage to avoid damaging the battery and possible fires and explosions that can result.

I proposed an idea for a school project to rapidly discharge the residual power of used batteries while minimizing losses due to heat energy during the process.

 

I proposed an idea for a school project to rapidly discharge the residual power of used batteries while minimizing losses due to heat energy during the process.

OK, first, with the moderator hat on:

Your thread has been moved to the Homework Help forum. AAC rules limit the sort of help that can be given with coursework related questions to guidance based on your own work. For this reason, all such questions are required to be posted in the Homework Help forum as a clear indication of their nature.

I will respond to the content in a separate post.

 

I proposed an idea for a school project to rapidly discharge the residual power of used batteries while minimizing losses due to heat energy during the process.

Well, let's see what's going on here. I think you need to consider a few things, so here are some questions.

How is a "loss" defined? Alternatively, how can we define "efficiency"?
What does "discharge" mean, and in the context what does "power" mean?
When "discharging" "power", what happens? That is, what is the required result of power being "used"?
What units are used to specify power? What other units are they readily convertible to?

These questions, when carefully considered, should suggest a problem with your proposal. Think about it.

 

to rapidly discharge the residual power of used batteries while minimizing losses due to heat energy during the process.

Where do you think the energy stored in the battery will go?

 

Well, let's see what's going on here. I think you need to consider a few things, so here are some questions.

How is a "loss" defined? Alternatively, how can we define "efficiency"?
What does "discharge" mean, and in the context what does "power" mean?
When "discharging" "power", what happens? That is, what is the required result of power being "used"?
What units are used to specify power? What other units are they readily convertible to?

These questions, when carefully considered, should suggest a problem with your proposal. Think about it.

First of all I appreciate your comments.

1. My idea is to extract electric energy from spent batteries and use it to charge other batteries. I considered the Cuk converter because, although not entirely certain, preliminary research suggests that it minimizes power losses.
2. The term 'power' refers to the remaining electrical energy, and it signifies discharging the residual power in discarded batteries.
3. Consequently, I thought that by using a converter to discharge the battery at an output voltage higher than its own, it would discharge rapidly.
4. 'Voltage: input voltage and output voltage are the units to measure

 

Where do you think the energy stored in the battery will go?

It may depends on purpose. if it is connected to the ground it would go to the ground

 

First of all I appreciate your comments.

1. My idea is to extract electric energy from spent batteries and use it to charge other batteries. I considered the Cuk converter because, although not entirely certain, preliminary research suggests that it minimizes power losses.
2. The term 'power' refers to the remaining electrical energy, and it signifies discharging the residual power in discarded batteries.
3. Consequently, I thought that by using a converter to discharge the battery at an output voltage higher than its own, it would discharge rapidly.
4. 'Voltage: input voltage and output voltage are the units to measure

My idea is to extract electric energy from spent batteries and use it to charge other batteries. I considered the Cuk converter because, although not entirely certain, preliminary research suggests that it minimizes power losses.

The term 'power' refers to the remaining electrical energy, and it signifies discharging the residual power in discarded batteries.

You didn't answer my first question: How is a "loss" defined? Alternatively, how can we define "efficiency"?

I will add: Why would you charge other batteries? What will be done with the charged batteries?

Consequently, I thought that by using a converter to discharge the battery at an output voltage higher than its own, it would discharge rapidly.

What are the limiting factors when charging batteries? How would increasing the voltage of the source battery make things go faster?

'Voltage: input voltage and output voltage are the units to measure

You are dealing with a very technical area, and words have specific and formal meanings. "Power" is one of those words. It is important that you not switch back and forth between formal and informal uses while talking about this.

"Voltage" is not a unit of Power. It is one term in the equation to calculate power. This may seem trivial but it is essential that you understand the differences between voltage, current, and power to be successful in understanding the higher level things you want to work on.

 

It may depends on purpose. if it is connected to the ground it would go to the ground

Uh, no.

 

I am trying to discharge the battery as fast as possible.

Commonly known as an explosion.

 

I am trying to discharge the battery as fast as possible. what I am thinking of is applying cuk converter to discharge.
Beside that what is the best converter for high-speed discharge, heat management.

+ And I found that there is an Over discharge protection circuit in Litium batteries. How can I disable the protection as a discharge circuit?

Hi,

You need to understand why there is such a limit to begin with.
If the cell is limited to some discharge current it is because that is what the manufacturer decided to do in order to keep the cell from overheating. If the cell overheats, you get some very nasty and very dangerous effects, such as fire or explosion.

What the main issue is all about is the internal resistance of the battery combined with the discharge or charging current. It the current is allowed to go too high, the internal resistance and the current level produce what is sometimes called power heating, and that heating causes the cell temperature rise.
These kinds of cells also have what is known as thermal runaway. That is when the temperature of the cell actually causes the temperature to rise even more. This can easily lead to a fire, but not just any fire. It would be a fire that is very hard to control, so that means very hard to extinguish. It could actually burst into flames and of course that could easily start other things in the home on fire too.

Believe me, you do not want this to happen. Read around the web about how these cells behave and see for yourself. There are a lot of videos that show what happens when a cell starts on fire. It doesn't just burn like wood or paper, it actually shoots fire out like a blow torch, and it can last for several minutes.

This is one of the reasons why there are laws about what circumstances these cells can be allowed to fly on airplanes. When you go to the post office these days (in the US) you have to sign something that states whether or not you are shipping something with Li-ion (or similar) cells in it. That's so they can limit how they ship them.

Really bad idea. If you can't live without doing this, then you need to set up a special environment where the cells are allowed to burn off any way they wish. That would mean most likely doing this outside in a wide-open area where they cannot cause anything else to start on fire like a car or house, or even catch trees or bush on fire.

 

My idea is to extract electric energy from spent batteries and use it to charge other batteries.

There is generally not enough energy left in "spent" batteries to make it worth the cost, time, and effort to try to extract it.

 

Hello again,

People have used the Joule Thief LED circuit to drain batteries that are so low in energy that they are not useable in any other application anymore. I think it is a big waste of time also, unless maybe you have a million batteries to drain.

These days you can get AA batteries for a pretty decent price on Amazon and other places. If you really hate wasting energy though, then get some good rechargeable cells like the Eneloop series. You can use them over and over again. This means that if there is any energy left in them once they are charged again you can use them again so that tiny left-over energy isn't really wasted.

 

Many Lithium-Ion or Li-PO battery cells do not have have a protection circuit because the product they are used in have the protection circuit.

Therefore if the discharge current or charging voltage is too high then the battery explodes in flames.
If a Lithium-Ion or Li-PO battery cell is discharged lower than 3V then its life is shortened. If it is discharged below 2.5V then it is destroyed and it might explode when attempted to be charged.