Tesla Battery Supplier PANASONIC, Has a Solid-State Cell Ready – It's Not for Cars

Overview

Panasonic (a Tesla battery supplier) announced a solid-state battery cell aimed at high-heat/industrial and medical applications, not EVs.

Key Technical Points

Temperature durability

• The sample cell is designed to operate at 150°C (302°F).
• This is an improvement over a previous 125°C limit.

Cell format

• Panasonic moved from coin-shaped cells to small rectangular cells.
• Rectangular format should make integration easier for product designers.

Solid electrolyte / chemistry (likely)

• Panasonic did not publicly disclose the exact solid electrolyte material.
• However, Panasonic’s statements about sharing technology with its regular lithium-ion batteries, along with industry context (e.g., Toyota and Maxell pursuing sulfide electrolytes), strongly suggests a:
  • sulfide-based all-solid-state lithium-ion approach

Why that matters:

• Pros: sulfide solid electrolytes are associated with good heat tolerance and fast charging.
• Cons: they are harder and more expensive to manufacture at scale.

Why 150°C Matters (Use Cases)

• Conventional liquid lithium-ion batteries often degrade above ~60°C and may require cooling (and can present fire risks).
• A battery tolerating 150°C could be used with less/no cooling in environments such as:
  • Steam-sterilized hospital instruments
  • Tire-pressure sensors
  • Factory robots near heat sources

Go-to-Market Timeline

• Sample shipments: Oct–Dec (this year)
• Mass production: 1–2 years later
• Likely product rollout: around 2027–2028, mainly in:
  • Medical devices
  • Robots
  • (Not cars)

Performance and Why It’s Not an EV Breakthrough

Earlier performance claims (from 2023)

Media reports previously suggested:

• 10–80% charge in ~3 minutes
• Tens of thousands of cycles (vs. ~3,000 for typical Li-ion)

However, those numbers are not officially updated for this new sample.

Missing critical specifications

Panasonic has not published official numbers for the new cell’s:

• Lifetime / cycle life
• Energy density
• Cost

Energy density concern

• Panasonic’s best current liquid Li-ion cells are about 800 Wh/L, targeting ~1,000 Wh/L by 2031 using silicon.
• Reporting suggests the solid-state cell has significantly lower energy density than Panasonic’s best NMC liquid Li-ion cells.
• Since energy density drives EV range, the conclusion is that this cell is not yet a practical solid-state EV battery.

What Panasonic Likely Builds for EVs Instead

The discussion contrasts the solid-state effort with Panasonic’s EV-focused lithium-ion roadmap:

• A lithium-ion anode-less design (no anode) is claimed to deliver about 25% more energy in the same space by end of 2027.
• The video translates this into potential range improvements (example given):
  • ~+145 km / +90 mi in a Tesla Model Y configuration

Main Sources / Speakers

• Panasonic Energy Chief Technology Officer (announced at a battery trade show in Japan; unnamed in subtitles)
• Video narrator/host (Electric Viking channel) providing analysis and comparisons