Beyond the Misunderstood Power Bank: Unveiling the True Potential of Portable Power Station
fast electric skateboard lipo charging system (bms + cc/vc psu)
by：CTECHi
2020-04-23
Charging of lithium-
The ion battery back, usually found in DIY electric skateboards and bicycles, is usually done with a balance charger, such as the IMAX b6.
These chargers can be set-
It is suitable for various battery packs, but they usually require external power supply, which is large in size and does not charge fast.
This specification will introduce a new charging system for electric skateboard batteries.
I will introduce how to connect the cheap BMS (
Battery Management System
For the battery pack of an electric skateboard, and how to convert cheap but powerful power supplies to a battery charger by applying a current limit to it.
This battery charging system can also be suitable for electric bicycles, even with pre-made laptop-
This is a very portable and convenient solution.
This video will introduce the basics of this structure.
This is not a step. by-
But it will cover up the foundation of the system.
Choose the best place on eBay to find a BMS for your LiPo pack.
They usually cost around $16 and have a variety of different unit configurations.
You need a cell with a rating of how many LiPo cells are in your series. (
I have 6 series so I will use 6 s BMS).
It is very important to select BMS with \"balance unit\" function.
Some BMS units are labeled incorrectly and are actually just a protection circuit.
These BMS boards usually have current-cutoff as well.
The current cuts don\'t matter-off is.
These current ends at about 30 amps, which is still too low for an electric skateboard that can reach 100 amps.
Use the cheapest BMS that meets the number of LiPo cells and has a balance function.
This is the link I used to search.
Select power on eBay these cheap power supplies are equipped with a potentiometer that can adjust the voltage range and give or accept about 20%.
You need a power supply that can be set to a higher voltage than the full charge voltage of the battery pack.
For example, my 6 s system is fully charged at 25. 2 volts.
The 24 v power supply can provide 25 v power supply. 2 volts.
Here is a list of typical power supplies, voltage ranges, and the number of batteries that can be charged: you will need to select the power supply that will suit your number of batteries.
In addition, a voltage regulation potentiometer can be replaced to give you a larger voltage range, however, it is not recommended to exceed the maximum voltage as it will damage some capacitors.
Unexpected operation may result from lower than the preset voltage.
The wattage of the power supply will affect the speed at which you charge the battery (
More information later).
You can also use the preset power supply to charge the skateboard, which is in the form of a laptop-
Power brick style.
All you need to do is choose one for your specific cell count.
These power supplies are usually cheaper on Amazon, but they tend to have lower currentratings.
Connect the BMS to the battery pack by welding the connection above.
Normally there is a chart on the eBay seller page that you can follow.
However, since we will go beyond the current limit of BMS, you can weld the ESC line directly to the battery.
You can also use gold if you want your system to be modular-
An plated bullet connector that connects everything together.
You also need to weld some kind of connector at the input of BMS.
Here is the cheapest option for about $0. 70.
This Jack is used on electronic devicesGO boards.
However, I decided to buy something more durable.
To prevent accidental shorts, it is recommended to use female jacks on the skateboard side.
The first step in converting the power supply is to set the voltage to the maximum voltage of the battery pack.
I am using the 6 s battery pack so I will set it to 4. 2v * 6 = 25. 2v.
Unfortunately, these Chinese power supplies are used for audio applications and are usually set to 130% of the rated constant output (
To be able to handle bass-drums).
So if we plug the power into the BMS, the battery will proportional the current to the total resistance * difference in the voltage (
AKA, it will melt the power supply in a short time).
So we need to go into BMS and find a way to reduce the current limit a little. I reverse-
Controlling the engineering part of the circuit near the chip, I found that adding a 10 k Ohm potentiometer to the pin of the R35 allows me to adjust the current.
The potentiometer is very sensitive, but it seems to work very well.
This resistor seems to be the same on other power supplies, and on real MeanWell power supplies it is often referred to as \"R33 mod \".
I weld the potentiometer with some very long wires and take it outside the power supply so it can be adjusted later.
To make this power more of a real-
Looking at the charger, I decided to add an LED toggle switch and an ammeter (current meter)
According to the schematic diagram above.
Both of these things are cheap!
I didn\'t use any connection this time, I just welded everything according to that chart.
You have to be careful when connecting the ammeter, the current has to flow in a specific way, otherwise it will short circuit
Circuit with power input!
I also added the power plug that was cut off from the old computer line.
I suggest you choose a ground plug because it will safely ground the power supply in the event of an accident.
Then I cut it with a jigsaw puzzle and then hot-Sticky some high
The density foam together made a beautiful box for my power supply.
It seems to get hot even if the battery is not charged, so I drilled some big holes in it to ventilate (
Just a precaution, I don\'t think I really need them).
I glued the current.
Set the potentiometer to the side of the shell and use heat-
Shrink the pipe to cover all contacts.
You should have calibrated the voltage so far, but just in case, double
Check before proceeding.
Plug the power into the skateboard/bike and flip the on switch.
If you have an ammeter, it should show some numbers.
If you don\'t, you need to connect an ammeter between the skateboard and the PSU.
Then screw-
Use the potentiometer to set the driver of the current limit.
Do not set it to the rated current of the power supply.
You need to take the wattage of your power (
Mine is 120 watts)
, And divided by the maximum voltage of the battery (120 watts / 25. 2v = ~4. 76 amps).
You will then get the current limit that should be set.
Don\'t worry if your power supply exceeds the current limit for a minute or two.
It produces more heat than expected.
You can use the potentiometer to reduce the current limit to 0. And that\'s it!
Enjoy the new fast charger!
To roughly calculate how long it will take to charge, divide the battery capacity by the current limit you set.
Your Ansible will be charged in a few hours. (
Keep in mind that this starts with 3 v per cell.
If you only discharge to the nominal voltage, your actual charging time will actually be less).
Also, note on using LED buttons.
When you connect to the PSU, the LED light is powered by a battery while the PSU does not get the power.
This means that the LED will slowly drain your battery (
But don\'t worry, BMS will completely stop them from draining water! )
The LED will only light up if you connect the battery or turn on the switch.
The ion battery back, usually found in DIY electric skateboards and bicycles, is usually done with a balance charger, such as the IMAX b6.
These chargers can be set-
It is suitable for various battery packs, but they usually require external power supply, which is large in size and does not charge fast.
This specification will introduce a new charging system for electric skateboard batteries.
I will introduce how to connect the cheap BMS (
Battery Management System
For the battery pack of an electric skateboard, and how to convert cheap but powerful power supplies to a battery charger by applying a current limit to it.
This battery charging system can also be suitable for electric bicycles, even with pre-made laptop-
This is a very portable and convenient solution.
This video will introduce the basics of this structure.
This is not a step. by-
But it will cover up the foundation of the system.
Choose the best place on eBay to find a BMS for your LiPo pack.
They usually cost around $16 and have a variety of different unit configurations.
You need a cell with a rating of how many LiPo cells are in your series. (
I have 6 series so I will use 6 s BMS).
It is very important to select BMS with \"balance unit\" function.
Some BMS units are labeled incorrectly and are actually just a protection circuit.
These BMS boards usually have current-cutoff as well.
The current cuts don\'t matter-off is.
These current ends at about 30 amps, which is still too low for an electric skateboard that can reach 100 amps.
Use the cheapest BMS that meets the number of LiPo cells and has a balance function.
This is the link I used to search.
Select power on eBay these cheap power supplies are equipped with a potentiometer that can adjust the voltage range and give or accept about 20%.
You need a power supply that can be set to a higher voltage than the full charge voltage of the battery pack.
For example, my 6 s system is fully charged at 25. 2 volts.
The 24 v power supply can provide 25 v power supply. 2 volts.
Here is a list of typical power supplies, voltage ranges, and the number of batteries that can be charged: you will need to select the power supply that will suit your number of batteries.
In addition, a voltage regulation potentiometer can be replaced to give you a larger voltage range, however, it is not recommended to exceed the maximum voltage as it will damage some capacitors.
Unexpected operation may result from lower than the preset voltage.
The wattage of the power supply will affect the speed at which you charge the battery (
More information later).
You can also use the preset power supply to charge the skateboard, which is in the form of a laptop-
Power brick style.
All you need to do is choose one for your specific cell count.
These power supplies are usually cheaper on Amazon, but they tend to have lower currentratings.
Connect the BMS to the battery pack by welding the connection above.
Normally there is a chart on the eBay seller page that you can follow.
However, since we will go beyond the current limit of BMS, you can weld the ESC line directly to the battery.
You can also use gold if you want your system to be modular-
An plated bullet connector that connects everything together.
You also need to weld some kind of connector at the input of BMS.
Here is the cheapest option for about $0. 70.
This Jack is used on electronic devicesGO boards.
However, I decided to buy something more durable.
To prevent accidental shorts, it is recommended to use female jacks on the skateboard side.
The first step in converting the power supply is to set the voltage to the maximum voltage of the battery pack.
I am using the 6 s battery pack so I will set it to 4. 2v * 6 = 25. 2v.
Unfortunately, these Chinese power supplies are used for audio applications and are usually set to 130% of the rated constant output (
To be able to handle bass-drums).
So if we plug the power into the BMS, the battery will proportional the current to the total resistance * difference in the voltage (
AKA, it will melt the power supply in a short time).
So we need to go into BMS and find a way to reduce the current limit a little. I reverse-
Controlling the engineering part of the circuit near the chip, I found that adding a 10 k Ohm potentiometer to the pin of the R35 allows me to adjust the current.
The potentiometer is very sensitive, but it seems to work very well.
This resistor seems to be the same on other power supplies, and on real MeanWell power supplies it is often referred to as \"R33 mod \".
I weld the potentiometer with some very long wires and take it outside the power supply so it can be adjusted later.
To make this power more of a real-
Looking at the charger, I decided to add an LED toggle switch and an ammeter (current meter)
According to the schematic diagram above.
Both of these things are cheap!
I didn\'t use any connection this time, I just welded everything according to that chart.
You have to be careful when connecting the ammeter, the current has to flow in a specific way, otherwise it will short circuit
Circuit with power input!
I also added the power plug that was cut off from the old computer line.
I suggest you choose a ground plug because it will safely ground the power supply in the event of an accident.
Then I cut it with a jigsaw puzzle and then hot-Sticky some high
The density foam together made a beautiful box for my power supply.
It seems to get hot even if the battery is not charged, so I drilled some big holes in it to ventilate (
Just a precaution, I don\'t think I really need them).
I glued the current.
Set the potentiometer to the side of the shell and use heat-
Shrink the pipe to cover all contacts.
You should have calibrated the voltage so far, but just in case, double
Check before proceeding.
Plug the power into the skateboard/bike and flip the on switch.
If you have an ammeter, it should show some numbers.
If you don\'t, you need to connect an ammeter between the skateboard and the PSU.
Then screw-
Use the potentiometer to set the driver of the current limit.
Do not set it to the rated current of the power supply.
You need to take the wattage of your power (
Mine is 120 watts)
, And divided by the maximum voltage of the battery (120 watts / 25. 2v = ~4. 76 amps).
You will then get the current limit that should be set.
Don\'t worry if your power supply exceeds the current limit for a minute or two.
It produces more heat than expected.
You can use the potentiometer to reduce the current limit to 0. And that\'s it!
Enjoy the new fast charger!
To roughly calculate how long it will take to charge, divide the battery capacity by the current limit you set.
Your Ansible will be charged in a few hours. (
Keep in mind that this starts with 3 v per cell.
If you only discharge to the nominal voltage, your actual charging time will actually be less).
Also, note on using LED buttons.
When you connect to the PSU, the LED light is powered by a battery while the PSU does not get the power.
This means that the LED will slowly drain your battery (
But don\'t worry, BMS will completely stop them from draining water! )
The LED will only light up if you connect the battery or turn on the switch.
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