High Performance LiFePO4 Cell and Pack from JerryBattery

[JerryBattery]

Hi All,

I'm new here although I've been visiting this forum since several years ago. After working in the field of electric vehicle, renewable energy and rechargeable battery, I just started my own business by running a website at http://www.ecotownstore.com focusing on EV, LED, Solar, Wind and Battery. It seems that business scope is too wide, but all of the fields have relation to battery, and I've been working in battery field, including NiMH, Lithium-ion, and hydrogen fuel cell, for over 15 years, so that I got familiar with all of them.

Batteries are the core products that I can offer. Generally, what I can offer include:

1. LiFePO4 18650 (1100mAh) cell with discharge rate of 60C;
2. LiFePO4 5AH prismatic cell (Al case) with rate of 80-100C;
3. LiFePO4 8AH prismatic cell (Al case) with rate of 50-60C.
4. LiFePO4 20AH pouch cell with rate of 10C.
5. LiFePO4 40-60AH Prismatic cells (Al case) with rate of 5-10C.
6. LiFePO4 packs assembled with these cells for ebike, motorcycle and ev conversions.

7. Solar chargers for your different applications.

Hope you can be interested in these products.

I can be of your help if you have any questions concerning battery.

Best regards,
Jerry

[DAND214]

Are you just another China based whatever?

Dan

[deVries]

Are you just another China based whatever?

Dan

www.EcoTownStore.com is run by Gerry Electric Co.,Ltd, located at Taizhou city, China.

The major founders of Gerry Electric come from the industries of rechargeable battery, electric vehicle, solar photovoltaic and LED. All of them have more than 10 years of experiences in their industry. We also have one professor, serving as our partner, who specializes in the field of power electronics and carries out R&D work on solar PV controllers and LED drivers.

[mark5]

Trying to browse ecotownstore gives a drive-by download malware warning. Nice try, hacker.

[Jeremy Harris]

The give away that there's something awry here is the quoted discharge rates for those cells. How many cells rated at 80C to 100C do we know of?

I mean, a 5Ah prismatic LiFePO4 cell that has a rated discharge current of 400 A to 500A?

[JerryBattery]

Trying to browse ecotownstore gives a drive-by download malware warning. Nice try, hacker.

The http://www.ecotown-store.com is another doname for this website but now replaced by http://www.ecotownstore.com . The webmaster will check this problem. Please be sure that this is not a malicious website. Thanks.

[JerryBattery]

The give away that there's something awry here is the quoted discharge rates for those cells. How many cells rated at 80C to 100C do we know of?

I mean, a 5Ah prismatic LiFePO4 cell that has a rated discharge current of 400 A to 500A?

Yes, it's true that this 5AH cell is capable for 100C discharge rate.

All of the cells listed are best selected and available. Especially, the 18650 cells are powering several hundred hybrid electric buses in China now.

[boostjuice]

How about some photos/discharge graphs of your actual supposed high C rate cells? All I see on your website is generic pictures of batteries/powertools made by other companies (including motorcycle starter batteries filled with A123 M1 26650 Cells and Emoli cell filled Canadiantire Yardworks cordless tool packs)




Copy and paste of other manufacturers products.....really inspires confidence

[JerryBattery]

Hi Boostjuice,

Yes, you're right. The pictures are not of our own products, but we really make our own packs for our customers. Of course, the number of customers are not yet big enough since we're just starting the business. At least at present stage, we make starter batteries from 12V4.4AH to 24V20AH for one of our customers in Florida. I mentioned on the website that we're not authorized to show the pictures to those starter batteries to other potential customers, so that we copy other pictures from the online resources. Of course, we'll never say we make A123 cells or other brands' cells.

In fact, we're good at making the packs not the battery cases. We only work as OEM for our customers who will be responsible for the battery case design. Please have a look at my image for this forum, that is the picture of the real pack that we make.

I'll ask my customer to see if he is willing to place the pictures of his products on http://www.ecotownstore.com. If yes, I'll put the real pictures on the website ASAP.

Thanks for your notice.

[Spacey]

18650 LiFePO4 1100mAh 60C $3.15

60C!!!???

[JerryBattery]

18650 LiFePO4 1100mAh 60C $3.15

60C!!!???

The 62C discharge curve is attached below.
.

[deVries]

In your graph is that time per second?

IMO, it is not a good idea, business wise, to post pictures of other branded battery makers, so people might assume these are your batteries. Don't do that.

I think you have an excellent understanding of the English language to respond so quickly here. Few vendors do that.

In your graph, assuming time per second, it runs for just 5 seconds. Is this data presented for the purposes of a starter battery?

I'm curious, are you from another country now living in China, or are you from China? Your company name & "Jerry" name have me wondering??? Thanks.

[The Mighty Volt]

The give away that there's something awry here is the quoted discharge rates for those cells. How many cells rated at 80C to 100C do we know of?

I mean, a 5Ah prismatic LiFePO4 cell that has a rated discharge current of 400 A to 500A?

I was just about to say.

60C 18650 LiFePo4? Nah. No chance.

[cwah]

Lifepo4 rated 80-100C? That's way better than the ultimate nano-tech from hobby king in term of discharge rate.

What's the gravimetric density? (wh/kg)

[JerryBattery]

In your graph is that time per second?

IMO, it is not a good idea, business wise, to post pictures of other branded battery makers, so people might assume these are your batteries. Don't do that.

I think you have an excellent understanding of the English language to respond so quickly here. Few vendors do that.

In your graph, assuming time per second, it runs for just 5 seconds. Is this data presented for the purposes of a starter battery?

I'm curious, are you from another country now living in China, or are you from China? Your company name & "Jerry" name have me wondering??? Thanks.

Thanks for your comments. Yesterday I was allowed to put the pictures of our customer's products on the webpage to replace the original pictures of other manufacturers.

We make our own products and distribute other products from other manufacturers to offer a complete product line for our customers. I'll make it clear which are manufactured by ourselves and which are from our suppliers.

Yes, the discharge curve data for 5 seconds is presented for the purpose of a starter battery. We also have the continuous discharge curve for 40C/50C.

I'm from China. My name is Jerry. Thanks.

[JerryBattery]

Lifepo4 rated 80-100C? That's way better than the ultimate nano-tech from hobby king in term of discharge rate.

What's the gravimetric density? (wh/kg)

Oh sorry, the 5ah cell rating 80-100C has very poor gravimetric density (51wh/kg). It is made for some special applications such as starter battery, not hobby things. LiPo is the best choice for hobby.

[deVries]

I'm from China. My name is Jerry. Thanks.

Whomever taught you written English was/is a great teacher.

Tell us what battery/cell sizes & chemistry types you manufacture.

Can you get Genuine (not counterfeit) A123 cells too?

[agniusm]

If it sounds to be to good to be true, it most likely is.

[JerryBattery]

I'm from China. My name is Jerry. Thanks.

Whomever taught you written English was/is a great teacher.

Tell us what battery/cell sizes & chemistry types you manufacture.

Can you get Genuine (not counterfeit) A123 cells too?

The IFR18650 is what we made now. We distribute all other cells after we confirm the peroformance.

A123 has a factory in Changzhou, China and I live in a town close to the factory. However, I do not distribute their cells because I'm not sure whether what I get from them are A-grade cells.

[deVries]

The IFR18650 is what we made now.

Can you give us more performance data on this cell?

1) Some combinations of Cycle(s) (number of charge/discharge) vs Ah capacity remaining vs Voltage Drop/Sag under X-Load(s).

2) Some combinations of Expected Calendar Life vs Ah remaining vs Voltage Drop/Sag under X-Load(s).

3) Some information about charge/discharge C Ratings to optimize performance vs optimizing and extending cycles and calendar life.

Do you have any plans to offer this in a larger Ah form-factor too?

I'm just curious, approximately, how many miles/kilometers are you from the A123 plant. Do you know what cell types are made there?

Thanks.

[liveforphysics]

What is the internal resistance of you 100C cell?

[JerryBattery]

What is the internal resistance of you 100C cell?

less than 5 mohm

[liveforphysics]

What is the internal resistance of you 100C cell?

less than 5 mohm

So, 3.3v with 5mOhm impedance, let's call it 4mOhm impedance even on a 5Ah cell at 100C discharge. 500amps*0.004Ohm =2v of sag on a cell with 3.2-3.3v buffer plateau in discharge. Your loaded voltage at 100C discharge would be 1.2-1.3v, with 600-650watts of power being delivered by the cell for ~1,000watts of power going into heating the cell internally.

If it's a 4mOhm cell, your peak power delivery would come from discharging it at ~81C (the point at which half the cells power is going into heating itself and half the power is leaving the cell to perform work). If it's a 5mOhm cell, the point of peak power output would be 65C (and it will be sagged to 1.65v at this point).

Just as a familiar data point, if we look at a 5Ah 45-90C Nano-Tech cell, it measures about 0.8mOhm Ri, so at 90C discharge it's sag is 0.36v, meaning about 90% of it's stored energy at 90C discharge leaves the cell to be doing work, and 10% goes into internal cell heating.(and they still warm up quite a bit at 90C discharge)

[Sancho's Horse]

My wife is from China. Could you PM me a contact number so that she might speak with you?

Thanks.

[JerryBattery]

The IFR18650 is what we made now.

Can you give us more performance data on this cell?

1) Some combinations of Cycle(s) (number of charge/discharge) vs Ah capacity remaining vs Voltage Drop/Sag under X-Load(s).

2) Some combinations of Expected Calendar Life vs Ah remaining vs Voltage Drop/Sag under X-Load(s).

3) Some information about charge/discharge C Ratings to optimize performance vs optimizing and extending cycles and calendar life.

Do you have any plans to offer this in a larger Ah form-factor too?

I'm just curious, approximately, how many miles/kilometers are you from the A123 plant. Do you know what cell types are made there?

Thanks.

Hi DeVries,

The technical data of the 18650 cell will be sent to your by email and the data will soon be published on my website.

Please tell me your requirements on the larger form cells. Are you refering to the A123 26650 cells?

My home is less than 100km away from A123's plant. Yangtsz river runs between the two cities. I was informed that A123's Changzhou factory only makes the 26650 cells and it does not sell them to distributors or resellers. We purchases some samples from this factory at cost of $10/pc but the test result on the sample cells was not so good, so I believe that what we got were not A-grade cells.