How much you knew about the E-bike batteries ?

[shemozzle999]

Hi Benson,

Thank you for your reply.

I hope ebike battery construction will change to make them more user friendly.

With our winter approaching and with less riding of the bikes there are longer periods when the battery is not in use.

What level of charge in the battery would you recommend while not in use?

Are there are tips you can suggest to get the maximum number of charge cycles from a battery?

Regards, shemozzle

 

[10mph]

heh.... I have transfered your words and good story to Kelvin...and he refuse to answer why he is called Kelvin this name. yes, Kelvin this name is not special in Chinese Mainland. The culture of Chinese English name is not like you, your English name is given by your parents or relatives. but we are not. the English name was given by ourselves, parents only gave us the Chinese name. And the Chinese can not be translated to English. So... Some of our English name are given by our First English teacher, some are given by ourselves. Just like some USA people want to have a Chinese name when they arrive China, then they will find good given name theirselves. never thinking about the history of the name.

Ok. that's all for the name, you will find more things interesting when you come to China.
Let's go back to the topics. I do not deny there might be some mistake in my post. if you found there are something wrong, you can find it out and correct, I will appreciate it and it will be impressed to everybody here.

Thanks
Benson

Gens Ace battery,
Thank you for explaining that. I will reply to your points later on today after I have done some jobs outside. At least I am now beginning to think that Benson, Robin, Susan, and Kelvin may in fact be separate people in your Commercial Office, who have all copied and posted the identical article on different forums under their own names as the author.

So, belatedly, welcome to this forum from me.

 

[Gens Ace battery]

Hi Benson,

Thank you for your reply.

I hope ebike battery construction will change to make them more user friendly.

With our winter approaching and with less riding of the bikes there are longer periods when the battery is not in use.

What level of charge in the battery would you recommend while not in use?

Are there are tips you can suggest to get the maximum number of charge cycles from a battery?

Regards, shemozzle

Hi Shemozzle,

Yes, Winter is off-season for E-bike riding in some of countries.
For the battery storage problem, I confirmed with our engineers,
charge it over 60% power before you storage it, then charge 1.5 hours with 0.2C charger
every 3 month. Your battery will a nice winter day.

Hope it is useful for you.

Thanks
Benson

 

[shemozzle999]

Maybe that things will improve with the BMS boards now that you and others are producing larger capacity cells, removing the earlier need to parallel up cells to provide high capacity battery packs.
It could not be easy to ensure cell balance when in parallel.

 

[Gens Ace battery]

Maybe that things will improve with the BMS boards now that you and others are producing larger capacity cells, removing the earlier need to parallel up cells to provide high capacity battery packs.
It could not be easy to ensure cell balance when in parallel.

Yes, It need a smart BMS. Now we are planning to build BMS researching group to develop the battery management system. not only for E-bikes, also for other equipment. we are looking for some big and high level circuit solution company. you guys has any ideas or anyone can recommended ?

Thanks
Benson

 

[shemozzle999]

Hi Benson,

If the same RC system of charging the batteries was adopted by the the ebike industry, i.e. connect to the battery via the balance leads, most of the BMS circuitry would be contained in the charger.

The current limit and low voltage cut-out is already taken care of by the ebike controller.

That would leave space in the battery shell to install a monitor, balance, discharge unit that could be operated by the user, they could monitor the condition of the battery and if the cells went out of balance they could press a button and re-balance them or if they want to store the battery they could press a button to discharge them to the recommended storage level, thus keeping the battery in tip top condition and maximising its life.

I would talk to the RC charger manufacturers and discuss the problem them and see if they could build chargers for ebike battery configurations.

The only external thing that would change on the battery would be the charge connector from 2 pin to multiple pin, the number of pins dependant on what voltage is required.

 

[neptune]

I think that this method of charging would be superior, because there would then be no need to scrap a battery because of BMS failure, and vice versa. The only real issue would be the long term reliability of the multi pin connectors. The balance charger would need to have a row of LEDs to show that each and every cell was in fact connecting to the BMS.

 

[Gens Ace battery]

Hi Benson,

If the same RC system of charging the batteries was adopted by the the ebike industry, i.e. connect to the battery via the balance leads, most of the BMS circuitry would be contained in the charger.

The current limit and low voltage cut-out is already taken care of by the ebike controller.

That would leave space in the battery shell to install a monitor, balance, discharge unit that could be operated by the user, they could monitor the condition of the battery and if the cells went out of balance they could press a button and re-balance them or if they want to store the battery they could press a button to discharge them to the recommended storage level, thus keeping the battery in tip top condition and maximising its life.

I would talk to the RC charger manufacturers and discuss the problem them and see if they could build chargers for ebike battery configurations.

The only external thing that would change on the battery would be the charge connector from 2 pin to multiple pin, the number of pins dependant on what voltage is required.

Hi Shemozzle and Neptune,

Another idea for that. maybe we gave too much pressure to battery BMS. If the battery can turn to the RC system, we can cancel the battery BMS directly. do not need the battery BMS anymore. The mainly function of the common BMS is the protection of overcharging and over discharging, short circuit protection and cells balance. The RC battery charger will be responsible the cells balance and overcharging protection. Maybe we can put another 2 function of over discharging and short circuit protection to the E-bike controller. just like the ESC of the RC helicopter. As I know some of the current E-bike controller has the function of over discharging function. then the E-bike battery will be the same as RC battery. It will not be hard for the controller supplier.

but we are only the battery manufacturer, do not have experience for the E-bike controller. if someone who have the ability to design a new project of this kind controller.it will be good.

And it is also risky, we do not know whether the market can accept it or not.
Maybe it is only ours free talking...

Thanks
Benson

 

[shemozzle999]

Hi Benson,

The only problem with doing this is the the RC chargers require a 12v power supply unit to power the charger, usually a modified laptop supply, I do not think that would be acceptable to an ebike user, it would have to be only one unit.

That is why I suggested you talk to the charger manufactures to make a charger just for ebikes using the technology they have already developed. There are already 10/12 cell chargers on the market.

You would have to retain the output fault/shutdown circuit from the BMS although some commercial ebike battery packs have a fused output to protect the battery from direct overload.

This output fault/shutdown circuit could be added to the monitor, discharge and balance unit.

If you want to see how the typical controllers work maybe your guys could have a look at these links provided by another of our members d8veh:

http://www.ebikewheel.com/infineon.pdf

KU63 motor controller


Thanks, shemozzle

 

[shemozzle999]

Here is an example of the monitor, balance and discharge unit currently available to the RC market, shown on the left side of the picture, but is only available upto 6 cells at present:

 

[bigroy]

what you need is one of these. iCharger 3010B « ElectriFlyer