I'm back now.
I want to say, thanks MrPhoton very much for this thread, and thanks everyone here very much for your attention to this topic.
Exploring the answer to this question is also a learning experience for me! So, thanks MrPhoton!
EVE replied to me today, and I will sort out their replies as follows:
1. About the code of the production date in the serial number:
We can’t directly find its production date through the serial number on the cell. It’s just a code. We can send this code to EVE. They can inquire all information about the cell through EVE internal software---(mens system) ,from the raw material to the finished product to send out to customers. Of course, the production date is included.
2. About the production date:
This involves EVE's production process.
The production date represented by the serial number on the cell refers to the date when it is put into raw materials and made into semi-finished products.
After being made into a semi-finished product, it will sit for a period of time (there is no special regulation for the specific siting time, the only criterion is whether it passes the test). Generally, the longer the siting time, the more accurate and stable the data.
After EVE receives customers' orders, they will use the semi-finished products that have passed the test manufacture to the finished products, and then test, match, and send out. In order to distinguish, we can define this date as the "manufacturing date"
Through EVE's inquiry, the semi-finished production date of the two "66" cells (02YCB66728600JACH0002569, 02YCB66728400JACG0021411) sent by MrPhoton is December 17, 2020. We ordered the batch cells at the end of June 2021 and received them in July, which means they have siting for about half a year.
3. About "66" and "71":
EVE replied that they are exactly the same cell, only due to the need of the new energy vehicle announcement file (their statement is very professional, sorry, I don't quite understand that), the cells are marked with the two numbers.
Through above 1 and above 2, we could know that if the serial numbers of the cells one customer received is almost or completely continuous, it will be untrue. Unless they are not really grade A, and not matched.
EVE matches the cells only based the test data, not based on the serial numbers.
4. About the "5.6AH" I mentioned
For grade A cells, meeting the specifications is the minimum requirement. So, I am not saying that its actual capacity can allow 280-5.6=274.4AH.
No, its actual capacity is around 289AH.
It's just that EVE has its own standard for matching. For the same group cells, they have strict regulations on the internal resistance difference, voltage difference and capacity difference. 5.6AH is the largest capacity difference allowed in their standard.
5.About the cells supply:
We report our estimated monthly demand to EVE, so they will reserve those for us.
In fact.according to our experience working with EVE, for real grade A cells, it will always be available, just with occasional delays in delivery.
EVE also asked me to convey to everyone, they kindly invited all of you to visit their factory!
This is a very helpful, nice and open platform. If all of you have any other questions, please feel free to contact me, through private conversation, email or Alibaba,all is ok.
Kind regards,
Amy