byd blade battery

[Mark Kinsler]

The claim is that this EV battery can charge in 5 minutes or so.  The usual capacity.of an EV is around 800 kWh @ 400v or 800v.  Where would they get that much current in a charging station or anywhere else?  

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Mark Kinsler

512 East Mulberry Street
Lancaster, Ohio USA 43130
740-503-1973

[Paul Koning]

Is that a "solid state" battery?  There was a WSJ article about this recently.  It seems to be emerging technology, just trying to get into volume production.  Beta testing new batteries in a Chinese product seems like a bad idea.

And yes, this needs new charging stations.  

I think you mixed up units.  Battery capacity tends to be around 100 kWh.  That means high speed chargers, given various inefficiencies, need several hundred kW (not kWh) of power.  The solid state batteries with their long range have higher than usual capacity, which combined with supposedly faster charging calls for a charging station that can deliver roughly a megawatt, most likely at 800 V.  That's a pretty fat charging cable, and quite a power drop from the local utility.

paul

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[Joel Phelps]

I’ve seen the BYD batteries mentioned in the British motoring press.  It sounded like the blade batteries were a way of building the batteries in a format that was more efficient for the anode shape and also for thermal management.  For a long time, just about everything from flashlights and power tools used the 18650 battery format.  It was at least 6 years ago, but I remember a Tesla car being referenced as having thousands of these 18mm diameter by 650mm long batteries.  This seemed to by very typical for EVs and it was unusual when the Nissan leaf had custom sized flat batteries.  I also remember references to prismatic batteries which were supposed to have less wasted space.  BYD is a huge company and they are a battery producer.  They sell a raft of models of electric cars in Europe. 

BMW has recently released dedicated 3 series SUV EV (as opposed to having a gas version sharing the same chassis) and they are about to release a 3 series EV sedan.  The articles reference a battery format that was somehow a significant improvement but there weren’t any details.  The British Magazine Top Gear drove the SUV version across the width of England (London to Lands End) some 480 miles on a single charge.  A couple of years ago a Mercedes prototype damage to beat 1,000 kilometers.

Generally when a EV company references a really fast charging time, it is for the battery to charge from 20% to 80% power.  They all recommend that not charging the batteries to 100% makes them last a lot longer.  

I’ve seen references to at least three companies who are working on “solid state” batteries.  They all seem to have demonstrable prototypes and I have a vague recollection that one was producing a limited number of batteries for an actual product, but whatever it was it wasn’t a vehicle.  I haven’t seen even a prototype vehicle with solid state batteries.

There are sever cars that claim to support 800V charging, but any mention of this is accompanied by mention that 400V is the highest you’ll ever find at a public charger and that most are less than that.  Still, there are a lot of tests of TVs in the British press and quite a lot mention that it’s not unusual to get a 20-80% charge in 15-20 minutes.

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[Mark Kinsler]

Whoops.  That's why my calculations were strange.  Thanks.

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[Mark Kinsler]

I heard a normally-reliable NPR talk show ("On Point") today. It featured two experts on the subject, but I think both may have been compromised in some way.  (Both were Chinese and neither was based in the US, which could imply apparatchiks of the government.)  In any case, my vaporware sensors were activated.  Full charge in 9 minutes, they said.  

Historically battery improvements have been slow and incremental, and we've  heard nothing from other manufacturers or laboratories.  However, bogus claims for storage battery technologies have been frequent and date back to Thomas A. Edison, who was inundated with them.  

1 MW = 10e6 Watts = 800v x 12,500 amperes per charging station.  That doesn't seem realistic.

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[Paul Koning]

On Apr 9, 2026, at 6:19 PM, Mark Kinsler <kins...@gmail.com> wrote:

I heard a normally-reliable NPR talk show ("On Point") today. It featured two experts on the subject, but I think both may have been compromised in some way.  (Both were Chinese and neither was based in the US, which could imply apparatchiks of the government.)  In any case, my vaporware sensors were activated.  Full charge in 9 minutes, they said.  

Historically battery improvements have been slow and incremental, and we've  heard nothing from other manufacturers or laboratories.  However, bogus claims for storage battery technologies have been frequent and date back to Thomas A. Edison, who was inundated with them.  

1 MW = 10e6 Watts = 800v x 12,500 amperes per charging station.  That doesn't seem realistic.

No, but you slipped a decimal point.  The actual current is 1250 A, which is certainly high but doable wiith a fat cable.

paul

[Paul Koning]

> On Apr 9, 2026, at 5:44 PM, Joel Phelps <joel.e...@gmail.com> wrote:
>
> I’ve seen the BYD batteries mentioned in the British motoring press. It sounded like the blade batteries were a way of building the batteries in a format that was more efficient for the anode shape and also for thermal management. For a long time, just about everything from flashlights and power tools used the 18650 battery format. It was at least 6 years ago, but I remember a Tesla car being referenced as having thousands of these 18mm diameter by 650mm long batteries. This seemed to by very typical for EVs and it was unusual when the Nissan leaf had custom sized flat batteries. I also remember references to prismatic batteries which were supposed to have less wasted space. BYD is a huge company and they are a battery producer. They sell a raft of models of electric cars in Europe.

I think Boeing did the same when they created Li batteries for the 787, and had trouble. Yes, prismatic batteries would seem to save space, but it's not so clear given that car propulsion batteries need a cooling system. Cylindrical cells can be stacked pretty closely, and the space left over can carry cooling pipes.

Quite likely the 18650 was picked by Tesla because it was a standard type, so they could just order a suitable number of millions of them and not have to deal with yet another problem, the creation of a whole new manufacturing line just for the batteries. BTW, I'm pretty sure they are 65 mm long, not 650. From pictures I have seen the Tesla battery packs have the batteries nicely arranged standing up vertically, in a number of compartments constructed to act as fire blocks. The resulting pack is also a structural element.

paul

[joel.e...@gmail.com]

Yep, the length is 65mm. I would not be surprised if they are still used in some current cars. At the time when I saw that Tesla was using them, they were the preferred practical solution. I remember seeing articles about using the 18650 format in electric bikes and the wiring design was said to be both somewhat tricky and key to the pack’s performance. There’s probably more than one early Tesla engineer that still has nightmares about designing the wiring for a multiple thousand cell implementation.

> On Apr 10, 2026, at 9:55 AM, Paul Koning <pa0...@gmail.com> wrote:
>
> 

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