Can a Power Bank Explode? Solid-State Nail Penetration Test and PSE Certification Explained

News stories about power banks catching fire have not been rare these past couple of years: flames, heavy smoke, aircraft diverted mid-flight. So when solid-state power banks started marketing themselves as fire-resistant, you probably asked the obvious question. Is this genuinely safer, or the same claim in new packaging?

The short answer: under defined test conditions, solid-state cells are substantially safer than conventional liquid lithium cells. The difference is that a solid electrolyte replaces the single component most willing to feed a fire. But solid-state does not mean safe under every condition. This article uses real third-party test data to show where the safety difference sits, what the test conditions were, and which claims hold up.

Why liquid batteries burn: the root cause first

A conventional lithium cell is layered like a mille-feuille: cathode, separator, anode, stacked in sequence and soaked in an organic liquid electrolyte. That liquid is the problem.

When a cell ages, takes a physical impact, or the charging circuit loses control and overcharges it, a punctured separator lets the cathode and anode short. The heat from that short rapidly heats the organic liquid around it. Heated, the electrolyte vaporizes, meets oxygen in the air, and burns fiercely. That process is called thermal runaway, and once it starts there is almost no way to stop it other than removing heat.

What a solid-state battery does is take the liquid out. A solid electrolyte, or a semi-solid gel, does not flow, so even with the separating layer breached there is no fuel to keep combustion spreading. One way to picture it: the dangerous core of a conventional cell is a bucket of oil, and a solid-state cell swaps that bucket for dry sand.

The nail penetration test: the most direct safety test, and how to read it

The nail penetration test simulates a foreign object piercing a cell and causing an internal short. It is one of the most intuitive ways to assess battery safety.

TITANSHIELD's Chemitox results

TITANSHIELD solid-state power banks were sent to the Chemitox Hokuto LiB Test Center in Japan for third-party nail penetration testing, conducted 2025-11-07, report No.251692.

Test conditions: 3 mm steel nail, penetration speed 1 mm/s, full penetration of the cell, following the Chemitox laboratory's nail penetration setup.

Results:

All three outcomes are negative: no smoke, no rupture, no fire. Temperature on the 5,000 mAh cell barely moved, which means the energy released at the moment of the short was effectively contained by the solid structure.

The honest boundary: a 3 mm nail is not a blanket guarantee

One thing needs to be said plainly. The Chemitox test used a 3 mm steel nail at 1 mm/s with full penetration, which is that laboratory's nail penetration setup. Worth adding: nail penetration is an abuse test, not one of the statutory items in JIS C 62133-2, the standard PSE relies on (that standard uses forced internal short circuit, crush and similar methods). It is independent verification TITANSHIELD commissioned on top of mandatory certification. A thicker nail, a faster speed, or repeated penetrations could all produce a different result.

The correct statement is this: under the conditions of this third-party nail penetration test, TITANSHIELD's solid-state cells performed substantially better than conventional liquid lithium cells.

Claims that a battery is safe under any condition are off the table. No battery can do that, and saying so misleads people. What solid-state cells are worth is raising the safety threshold and making a dangerous event in everyday use significantly less likely. They do not take the risk to zero.

PSE certification: one of Japan's strictest battery safety standards

PSE is the mandatory certification under Japan's Electrical Appliance and Material Safety Act. Lithium batteries fall under JIS C 62133-2: 2020. That standard covers overcharge, over-discharge, short circuit, crush, high-temperature exposure and other extreme scenarios.

TITANSHIELD's PSE certification was completed by WALTEK Testing Group, an authorized body in Japan, certified 2025-12-22.

There are two PSE marks. The round PSE is mostly supplier self-declaration. The diamond PSE covers stricter, specified electrical products, which must be certified by a third-party body recognized by Japan's Ministry of Economy, Trade and Industry before they can be sold in Japan. What TITANSHIELD holds is the diamond PSE, certified by the third-party body WALTEK.

CCC, China's mandatory certification: TITANSHIELD's third mark

After PSE in Japan, TITANSHIELD solid-state power banks also obtained China Compulsory Certification (CCC). CCC is not a voluntary quality badge. It is a safety threshold a power bank must clear to enter the Chinese market, comparable in rigor to Taiwan's BSMI and Japan's PSE.

GB 31241-2022 is China's current mandatory safety standard for power banks. Its test framework covers five main areas:

1. Thermal abuse: the cell is held at 130°C (266°F) for 30 minutes and watched for fire or rupture. This tests cell stability at extreme temperature.

2. Nail penetration: a steel nail is driven through a fully charged cell to assess thermal runaway control after a short. This is the most direct simulation of physical damage.

3. Short circuit protection: an external short is created between the terminals to test whether the protection circuit cuts current within a reasonable time.

4. Over-discharge protection: the cell is discharged past its safe voltage floor to confirm the electrolyte does not break down from excessive discharge.

5. Overcharge protection: the cell is charged to twice its rated voltage to test whether the overcharge protection intervenes before fire or rupture.

TITANSHIELD has passed both CCC (China) and PSE (Japan), two national mandatory certifications, and meets the BSMI requirements for sale in Taiwan. What that represents is not a single sticker, but third-party verification of the whole design, from cell chemistry through to the protection circuit.

Solid-state vs liquid: the core safety differences

That last row matters. No commercial battery is absolutely safe under all conditions. What a solid-state cell gives you is a much lower chance of trouble during normal use, an accidental drop, or physical damage within the tested conditions. That gap is real, and there is test data behind it.

FAQ

Q1: Can a solid-state power bank never explode?

That is not a claim anyone should make. Under the third-party nail penetration conditions (3 mm steel nail at 1 mm/s), the solid-state cells produced no smoke and no fire, and are substantially safer than liquid lithium. A thicker object, a larger physical impact, or a flawed circuit design would still carry risk. The right way to read it: solid-state raises the safety threshold considerably, it does not clear the risk to zero.

Q2: What is the difference between PSE, BSMI and CCC?

All three are national mandatory certifications for entering their own markets, with similar test items that do not transfer between them. BSMI is issued by Taiwan's Bureau of Standards, Metrology and Inspection and is required for power banks sold in Taiwan. PSE is certification under Japan's Electrical Appliance and Material Safety Act, required for export to Japan. CCC is China Compulsory Certification, the threshold for the Chinese market, applying GB 31241-2022. TITANSHIELD holds PSE and CCC, both with verifiable certificate numbers, and meets Taiwan's BSMI requirements. On the wireless charging side, TITANSHIELD Pro also holds official WPC Qi2.2 certification (QI-ID: 27410), which can be checked in the WPC public database.

Q3: Where does the 3 mm nail come from, and is it a formal safety standard?

A common misunderstanding to clear up first: JIS C 62133-2, which PSE relies on, and the international IEC 62133, do not test batteries by nail penetration at all. They use forced internal short circuit, crush and similar methods. Nail penetration is a widely used industry abuse test, typically with nail diameters between 3 mm and 8 mm. The 3 mm TITANSHIELD commissioned from Chemitox simulates a cell pierced by a sharp metal object, such as a power bank punctured after a drop. So the correct reading is this: the nail penetration test is independent third-party verification TITANSHIELD arranged on top of mandatory certification, to show how solid-state cells behave under extreme physical damage. It is not a statutory JIS or PSE test item.

Q4: Are there restrictions on flying with TITANSHIELD?

TITANSHIELD 5,000 mAh (19 Wh) and 10,000 mAh (38.5 Wh) are both well under the 100 Wh ICAO limit, so they travel in carry-on baggage with no special declaration. US rules follow the same shape: power banks go in carry-on only, up to 100 Wh with no approval needed, 100 to 160 Wh with airline approval, and above 160 Wh not permitted. For the current rules in detail, see the full guide to flying with a solid-state power bank.

Q5: Plenty of products claim to be solid-state. How do you tell?

Two things. First, whether there is a third-party test report at all (nail penetration, PSE, BSMI and so on), which body issued it, and on what date. Second, whether the Wh rating is clearly marked, since a compliant power bank has to carry its watt-hour figure on the body. If a product only claims "solid-state" in text and cannot produce a report, treat it with caution.

Q6: How does a solid-state cell's structure differ from a conventional one?

A conventional liquid cell uses an organic liquid electrolyte, which flows readily and vaporizes and burns when heated. A solid-state cell uses a solid or gel electrolyte with very little flow, so after a short the heat dissipates comparatively slowly and a chain reaction is harder to start. For a deeper look at the structural differences, see our full breakdown of solid-state cell structure.

What to look for when you buy

You do not need to memorize the safety specs. Three things are enough when buying a power bank:

1. Check for a certification number (the basic threshold for legal sale in its market)
2. Look for a clear Wh marking on the body (if it is missing, skip the product whatever else it claims)
3. Ask the maker for a nail penetration report or certificate numbers from multiple countries (PSE, CCC and others you can actually verify)

TITANSHIELD's 5,000 mAh and 10,000 mAh models hold the Chemitox nail penetration report (No.251692), PSE certification (WTF25X10284942 / WTF25X10284943) and CCC certification (5,000 mAh certificate number 2025100914641049). TITANSHIELD Pro additionally holds official WPC Qi2.2 wireless charging certification (QI-ID: 27410). All of these are publicly verifiable. If you are looking for a solid-state power bank with a third-party nail penetration report, or want more capacity, the TITANSHIELD 10,000 mAh carries the same full set of third-party reports.

For the broader logic of choosing a solid-state power bank, start with our solid-state power bank buying guide.

Solid as a titanium mountain, which is why it is worth taking anywhere.