Ebike Lithium ion battery expert

[Chris_Luo]

Hi Guys,

This is Chris, i have over seven years experience in design and manufacturing lithium ebike battery.
Let me know if you have any battery issues.

Chris
Check Site: https://www.flionpower.com/blog/ to learn more lithium ebike battery knowledage

 

[major masingil]

Hi Chris, I checked out your link. Does your business sell individual batteries for the standard consumer, or do you mostly partner with other businesses to be their battery supplier?

 

[HumanPerson]

when you click the get in touch get in touch icons they trake you to the same place..facebook takes you back to their websire...so does the
youtube icon and the twitter icon.
I'd be cautious.

 

[Chris_Luo]

Hi Chris, I checked out your link. Does your business sell individual batteries for the standard consumer, or do you mostly partner with other businesses to be their battery supplier?

Hi Major,

We are lithium battery manufacture and foucus on B2B business, i am here to share my lithium battery experience and wish to help solve battery issues, and also i would like to learn the users's feedback here so that we may be able to improve our products.

Let me know if you have any lithium battery issues, i will try my best to deal with it.

 

[major masingil]

@Chris_Luo that's awesome! Being able to ask a battery expert questions is very helpful. I'd like to start right now!

I'm about 95 kg. My 52v 17 5aH battery starts to trigger the Low V setpoint of 43V at about 50-51V even on flat terrain. The battery is 2 years old and I only have charged it between 20-30 times. It's been this way since I bought it. This will happen at any PAS above 30-40% of the motor's capacity. Would you say that is normal to have 6-7 volts of sag at that battery voltage? For me it's like my ride is over when my battery gets to about 50% discharged. I've never discharged the battery past 49-50V resting voltage.

Additionally the battery drops from 58.8V to 58.1 shortly after the charge cycle is finished. But it doesn't drain more quickly than it used to. I'm pretty sure I made one of the battery groups fall out of balance over the winter and I am not sure how to get it balanced.

 

[Chris_Luo]

Hi Major,

We are lithium battery manufacture and foucus on B2B business, i am here to share my lithium battery experience and wish to help solve battery issues, and also i would like to learn the users's feedback here so that we may be able to improve our products.

Let me know if you have any lithium battery issues, i will try my best to deal with it.

when you click the get in touch get in touch icons they trake you to the same place..facebook takes you back to their websire...so does the
youtube icon and the twitter icon.
I'd be cautious.

Hi there,

Thank you very much for point out this link issue, i will fix these.

@Chris_Luo that's awesome! Being able to ask a battery expert questions is very helpful. I'd like to start right now!

I'm about 95 kg. My 52v 17 5aH battery starts to trigger the Low V setpoint of 43V at about 50-51V even on flat terrain. The battery is 2 years old and I only have charged it between 20-30 times. It's been this way since I bought it. This will happen at any PAS above 30-40% of the motor's capacity. Would you say that is normal to have 6-7 volts of sag at that battery voltage? For me it's like my ride is over when my battery gets to about 50% discharged. I've never discharged the battery past 49-50V resting voltage.

Additionally the battery drops from 58.8V to 58.1 shortly after the charge cycle is finished. But it doesn't drain more quickly than it used to. I'm pretty sure I made one of the battery groups fall out of balance over the winter and I am not sure how to get it balanced.

Hi Major,

From your description, it more likely some battery cell inside may failed, this cell failure may casued by poor cell quality or over discharged(battery in low capacity status and had not been charged in time during the winter time may caught high risk to cause overdischarged), cell overdischarged will cause cell failure and then cause voltage gap betweeen the series.

52V batteery is made of 14 Series, each serie's voltage should almost equal when in good condition, the full charged voltage is 58.8V=14*4.2V.
Battery BMS will monitor each serie's voltage to keep it at a safe range, usually around 2.8V/3.0V to 4.2V, the BMS will cut off charge/discharge if any serie's voltage reach 2.8V/3.0V or 4.2V.

->>regard the discharger issue
If the battery is in good condition, each serie voltage shoud be around 3.07V=43V/14 at 43V stage, and 3.64V=51V/14; but the battery trigger the low voltage setpoint at 51V, which means there is a voltage gap betweeen the series, a serie's voltage would drop to 3.0V earlier than other series and trigger the BMS cut off. Then actually the battery can not be real full discharged.

When motor increasing more power, the battery voltage will drop more, a serie's voltage will drop to 3.0V earlier than other series and trigger the BMS cut off.

->>regard the charge issue
When there is a voltage gap betweeen the series, some series will reach 4.2V full charged stage earlier than the lower voltage series and then trigger the BMS cut off charging, then actually the battery can not be real full charged. In this situation, 58.8V is actually from the charger's output, and 58.1V is the real battery voltage.

->>regard the solution
Some perofessional lithium battery repair shop can open the battery and use a balancer to balance the voltage of each series and then see if it can be recovered.

->>regard how to reduce the risk of battery over discharged, you may kindly refer to below post.
https://www.flionpower.com/using-and-storing-lithium-battery-pack-in-proper-methods/

 

[major masingil]

Hi there,

Thank you very much for point out this link issue, i will fix these.

Hi Major,

From your description, it more likely some battery cell inside may failed, this cell failure may casued by poor cell quality or over discharged(battery in low capacity status and had not been charged in time during the winter time may caught high risk to cause overdischarged), cell overdischarged will cause cell failure and then cause voltage gap betweeen the series.

52V batteery is made of 14 Series, each serie's voltage should almost equal when in good condition, the full charged voltage is 58.8V=14*4.2V.
Battery BMS will monitor each serie's voltage to keep it at a safe range, usually around 2.8V/3.0V to 4.2V, the BMS will cut off charge/discharge if any serie's voltage reach 2.8V/3.0V or 4.2V.

->>regard the discharger issue
If the battery is in good condition, each serie voltage shoud be around 3.07V=43V/14 at 43V stage, and 3.64V=51V/14; but the battery trigger the low voltage setpoint at 51V, which means there is a voltage gap betweeen the series, a serie's voltage would drop to 3.0V earlier than other series and trigger the BMS cut off. Then actually the battery can not be real full discharged.

When motor increasing more power, the battery voltage will drop more, a serie's voltage will drop to 3.0V earlier than other series and trigger the BMS cut off.

->>regard the charge issue
When there is a voltage gap betweeen the series, some series will reach 4.2V full charged stage earlier than the lower voltage series and then trigger the BMS cut off charging, then actually the battery can not be real full charged. In this situation, 58.8V is actually from the charger's output, and 58.1V is the real battery voltage.

->>regard the solution
Some perofessional lithium battery repair shop can open the battery and use a balancer to balance the voltage of each series and then see if it can be recovered.

->>regard how to reduce the risk of battery over discharged, you may kindly refer to below post.
https://www.flionpower.com/using-and-storing-lithium-battery-pack-in-proper-methods/

Thanks for your insight Chris. I appreciate the time you spent to answer the questions

 

[Atavar]

If you are looking at product development here is what I would love to see -
A charger that would by default charge to 80% then enter maintenance mode to hold the battery at 80% without charging further.
It would also have a big red supercharge button to fast charge to 100%