Webinar: Deep dive into third-party lab test results
HTML-код
- Опубликовано: 24 июл 2024
- QuantumScape CTO and Co-Founder Tim Holme is joined by battery expert and Professor of Mechanical Engineering at Carnegie Mellon Venkat Viswanathan, to review and discuss the significance of 3rd-party lab test results.
Complete test report from Mobile Power Solutions available here - www.quantumscape.com/wp-conte...
Webinar presented live on Nov. 18, 2021. 
Наука
Venkat is also a technical consultant @ Quantumscape. Is it really independent ?
36:12
Although they showed the charge and discharge curves including the charge rest, the IR drops are extremely large. In addition, their large voltage drop after the charge was observed. Those imply that their battery doesn't fit any automotive requirements. It would be difficult to reduce the dc impedance.
They might need another innovation for this.
these numbers are certainly promising when they're compared with other commercial products. the key really is how to mass produce with low costs.
How does it look for mass production of the batteries?
Great presentation, thank you. Two questions:
1. What are QuantumScape's milestones for 2022?
2. How is the plating of lithium managed as it passes through the separator; how does it stay uniform and what would happen to the battery performance if the plating is not absolutely flat (if anything)?
They apply pressure to keep the lithium plating uniform.
So around 2025-6 there should be cars with Solid State Batteries like these which should allow for longer BEV range and there should be commercially available cars with 1000 kilometers of range, yes?
Yes..
10 years from now, these batteries will be in everything. Li-Ion will be obsolete.
The future looks awesome!
Agreed! cant wait for QS to start mass producing these batteries
We’re see how fast mast production happens
@Dee Cee,
I wish I can share your enthusiasm, but here is what I see from the test data:
1. Average 1h charging voltage: 3.95 V
2. Average 1h current: 3 mAh/cm2
3. Layer area 7cm x 8.5 cm = 59.5 cm2
4. Layer thickness 0.29 mm. This comprise of 240 microns cathode materials, 20 microns each for current collector plates and 10 microns of the ceramic membrane. There is no anode.
5. The volume of one layer: 0.029 x 59.5 = 1.726 cm3 or 0.001726 L
6. 1h charging energy: 3.95 V x 3 mA/cm2 x 59.5 cm2 = 705.08 mWh = 0.705 Wh.
7. Energy density: 0.705/0.001726 = 408 Wh/L.
The energy density of QS ssb is much lower than any current lithium ion battery on the market. This is a very bad news for QS investor.
Am I wrong here ? Please show me if I am wrong.
@@KukabooraWhy, because the separator layer is thicker? Lack of a liquid electrolyte or anode should make SSB's significantly more energy dense than Li-Ion.
this is future battery
Next Theranos ?
We’re see
I wonder which automotive company gave the target of 800 cycles before 80% SoH. The best in class NMC gives >2500 cycles, LFP gives >4000 cycles for the same conditions. I wonder whats the gravitimetric energy density. Its not mentioned any where. Coulombic efficiency, hysteresis, normalized voltage are not really decision making parameters. Additional data to throw at people and confuse more.
there's something to do with packaging and material use when it comes to gravimetric and volumetric energy density. gravimetric energy density can go up to 600wh/kg in one of their presentations.
since the energy density is much greater, 800 cycles of solid state batteries yields pretty much the same mileage with 2500 cycles from lithium ion batteries
I personally think they are just lying. I have spoken to some of their former employees and they have nothing good to say about the battery tech. I will beleive when the battery is out. Until then im staying out
I before E except after C