Any interest in a battery pack?

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User avatar
scrappyjoe
Posts: 14
Joined: Sun Oct 30, 2016 8:02 pm

Tue Feb 28, 2017 9:01 pm

Hello,

I was wondering if there was any interest in a LiFePo4 18650-based battery that could serve as a UPS for the LP? The idea would be to build a battery holder that accepts a micro-usb input for charging and has a 2-pin output for powering the LP via the CN2 headers.

So, the flow of power would be:

Wall Mains --- > USB Cable ---> Battery --- CN2 connector ---> LattePanda

There would be no special power-down / auto shutoff functionality. It would just provide power until it runs out of juice, and it would make sure the right voltage arrived all the time.

LiFePO4 18650 batteries come in about 1500mAh sizes, at 3.3V, so it would only provide enough power to keep things going for a short while and I would have to build in a 5V step-up.

It this something I should work on? Alternatively, does something like this exist?

User avatar
LattePanda
Site Admin
Posts: 2549
Joined: Wed Jan 20, 2016 9:09 am

Wed Mar 01, 2017 2:41 am

sounds like a great idea. do you have any prototypes/concept photos/schematics you could share at this stage? nothing currently exists to my knowledge
Enjoy Tinkering with LattePanda ! :lol:

User avatar
space cops
Posts: 14
Joined: Fri Sep 30, 2016 6:36 pm

Sun Mar 05, 2017 7:21 pm

I personally made the latte panda work under battery with this
https://www.amazon.com/TalentCell-Recha ... DH9F127NTT

along side a 5 dollar 5v 3a UBEC. it can keep the lattepanda going for 5-6 hours on constant load

User avatar
LattePanda
Site Admin
Posts: 2549
Joined: Wed Jan 20, 2016 9:09 am

Mon Mar 06, 2017 2:52 am

space cops wrote:I personally made the latte panda work under battery with this
https://www.amazon.com/TalentCell-Recha ... DH9F127NTT

along side a 5 dollar 5v 3a UBEC. it can keep the lattepanda going for 5-6 hours on constant load
thanks for sharing. how was the UBEC connected to the LP? USB or CN2?
Enjoy Tinkering with LattePanda ! :lol:

User avatar
Lutz
Posts: 214
Joined: Mon Apr 18, 2016 4:30 am
Location: Germany, NRW

Mon Mar 06, 2017 12:53 pm

scrappyjoe wrote:Hello,

I was wondering if there was any interest in a LiFePo4 18650-based battery that could serve as a UPS for the LP? The idea would be to build a battery holder that accepts a micro-usb input for charging and has a 2-pin output for powering the LP via the CN2 headers.

So, the flow of power would be:

Wall Mains --- > USB Cable ---> Battery --- CN2 connector ---> LattePanda

There would be no special power-down / auto shutoff functionality. It would just provide power until it runs out of juice, and it would make sure the right voltage arrived all the time.

LiFePO4 18650 batteries come in about 1500mAh sizes, at 3.3V, so it would only provide enough power to keep things going for a short while and I would have to build in a 5V step-up.

It this something I should work on? Alternatively, does something like this exist?
LattePanda wrote:sounds like a great idea. do you have any prototypes/concept photos/schematics you could share at this stage? nothing currently exists to my knowledge
We have somthing like this under development.

Input voltage 8-24V (NO overvoltage protection, only for industrial power supplies, NOT for car or ships !)
LiPo charger for different batteries
5V/max.8A Output
3.3V/max.8A Output
additional STM32F0xx microcontroller, connected to CPU-COM1 and CPU-I2C
PowerOn-Button at STM32F0, Controller can power on LP
STM32F0 can monitor CPU-1.8V to detect "power off"
PWM-Output for 24V/5V-Fan from STM32
additional 24V/1A MOSFET-Outputs from STM32
additional Arduino connectors
10W mono Audio amplifier

Controller software is monitoríng PMIC, CPU voltage, communication over RS485 with simple protocol
Better would be using I2C but we have no Win10 Driver for it.

disadvantage : PCB is 195mm x 100mm big
PCB_2.JPG
PCB_2.JPG (196.43 KiB) Viewed 11506 times
I can ask my boss for cooperation with an other company. Maybe with slightly different specifications...

User avatar
billymac
Posts: 7
Joined: Thu Mar 09, 2017 12:43 pm

Thu Mar 09, 2017 1:34 pm

I was thinking of making a 18650 based pack for my panda using 2 or 4 cells
Since the cell voltage is a little under 5v (4.8 I think) I am not sure if I can run the panda with that or not.
I assume I would need to put the 4 cells in series/parallel to get a total of 9.6 then regulate it down to 5.
That way, the voltage would say at 5v longer when the cells start to discharge.
I already have a battery charge module with voltage, current and cutoff pots I can use but I am not sure how I should hook it up.
If I was using 1 or more cells in parallel, I assume I could simply run the adapter into the input (8 - 30v) then put the panda and battery in parallel on the output and set it to 4.8v?
Assuming the bat will charge up to 4.8, then stop charging and if I unplug the charger, the panda will work for a while until the voltage drops too much.
If I use the 9.6 volt method, I assume I would need a buck converter on the output going into the panda?
Or is there already a capable voltage regulator on the panda that would allow me to drive it with 9.6 directly?

User avatar
ED209
Posts: 222
Joined: Tue Apr 19, 2016 3:31 pm

Wed Mar 15, 2017 5:23 pm

scrappyjoe wrote:Hello,

I was wondering if there was any interest in a LiFePo4 18650-based battery that could serve as a UPS for the LP? The idea would be to build a battery holder that accepts a micro-usb input for charging and has a 2-pin output for powering the LP via the CN2 headers.

So, the flow of power would be:

Wall Mains --- > USB Cable ---> Battery --- CN2 connector ---> LattePanda

There would be no special power-down / auto shutoff functionality. It would just provide power until it runs out of juice, and it would make sure the right voltage arrived all the time.

LiFePO4 18650 batteries come in about 1500mAh sizes, at 3.3V, so it would only provide enough power to keep things going for a short while and I would have to build in a 5V step-up.

It this something I should work on? Alternatively, does something like this exist?
I considered similar solution before. The best solution in the market right now is directly purchasing the PCBA module, which is designed for 5v 2A power bank. Then you just need to connect the 18650 battery with holder to this 5v booster and wiring the output to CN2 on LattePanda. As a standard power bank solution, it comes with charging function and port.

Exp. http://www.ebay.com/itm/5V-2-1A-1A-2A-M ... SwOgdYvRcN
http://www.ebay.com/itm/Green-Power-Ban ... OSw4CFYm~Z~

The only problem I know is it's better to choose a quality one!....

What do you think?

User avatar
ED209
Posts: 222
Joined: Tue Apr 19, 2016 3:31 pm

Wed Mar 15, 2017 5:25 pm

Lodin_Erikson wrote:
scrappyjoe wrote:Hello,

I was wondering if there was any interest in a LiFePo4 18650-based battery that could serve as a UPS for the LP? The idea would be to build a battery holder that accepts a micro-usb input for charging and has a 2-pin output for powering the LP via the CN2 headers.

So, the flow of power would be:

Wall Mains --- > USB Cable ---> Battery --- CN2 connector ---> LattePanda

There would be no special power-down / auto shutoff functionality. It would just provide power until it runs out of juice, and it would make sure the right voltage arrived all the time.

LiFePO4 18650 batteries come in about 1500mAh sizes, at 3.3V, so it would only provide enough power to keep things going for a short while and I would have to build in a 5V step-up.

It this something I should work on? Alternatively, does something like this exist?
LattePanda wrote:sounds like a great idea. do you have any prototypes/concept photos/schematics you could share at this stage? nothing currently exists to my knowledge
We have somthing like this under development.

Input voltage 8-24V (NO overvoltage protection, only for industrial power supplies, NOT for car or ships !)
LiPo charger for different batteries
5V/max.8A Output
3.3V/max.8A Output
additional STM32F0xx microcontroller, connected to CPU-COM1 and CPU-I2C
PowerOn-Button at STM32F0, Controller can power on LP
STM32F0 can monitor CPU-1.8V to detect "power off"
PWM-Output for 24V/5V-Fan from STM32
additional 24V/1A MOSFET-Outputs from STM32
additional Arduino connectors
10W mono Audio amplifier

Controller software is monitoríng PMIC, CPU voltage, communication over RS485 with simple protocol
Better would be using I2C but we have no Win10 Driver for it.

disadvantage : PCB is 195mm x 100mm big
PCB_2.JPG
I can ask my boss for cooperation with an other company. Maybe with slightly different specifications...
WOW... This looks REALLY powerful.. Will you guys sell it on your company e-store?

User avatar
LattePanda
Site Admin
Posts: 2549
Joined: Wed Jan 20, 2016 9:09 am

Wed Mar 29, 2017 10:54 am

DF is also working on a solution, looking to be released in about 4 months (although timescales are subject to change as you probably know...)

Including but not limited to:

7-12v input
Arduino shield compatiblity
Gravity sensor compatibility
Analog and digital GPIO
3.3 and 5v conversion
i2c
prototyping space
Enjoy Tinkering with LattePanda ! :lol:

User avatar
UtahMadMike
Posts: 4
Joined: Fri Feb 24, 2017 9:02 pm

Fri Apr 07, 2017 8:15 pm

We have been developing a smart battery pack for some time. POC is done and now we are looking to send it to production. It's smart. . . It will notify the SBC when the battery is low and monitor the SBC health.

See: https://www.youtube.com/watch?v=a-Jkjn02fYY

Image

Patent application: 62/328,236

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