18650 Battery Explosion-Proof Cap with PTC & Aluminum Tab (18#Z Structure)

Packaging Options
Model Selection:
18#Z Cap with PTC & Welded Tab (15 x 3 x 0.15 mm) – 100 pcs/pack

Product Description
18650 Battery Explosion-Proof Cap / Safety Combination Cap (with PTC & Tab)

Application:
Designed for 18650 cylindrical lithium-ion batteries (Capacity Type). This component serves as the top seal and primary safety mechanism, featuring a “Straight Seal” 18#Z structure.

Key Features:
* Dual Safety Protection: Equipped with a PPTC thermistor for over-current/temperature protection and an aluminum explosion-proof disc (vent) to release pressure under extreme conditions.
* Pre-Welded Tab: Comes with a pre-welded aluminum tab (15 mm x 3 mm x 0.15 mm) for convenient battery assembly and connection.
* High Durability: The steel cap is made of nickel-plated carbon steel, passing a 5-hour salt spray test (Grade 10) to ensure corrosion resistance.
* Precise Activation: Engineered with specific pressure thresholds for circuit breaking (0.9-1.4 MPa) and bursting (1.8-2.5 MPa) to prevent battery explosions.

Technical Specifications (Performance):
* Open Circuit Pressure: 0.9 – 1.4 MPa
* Burst Pressure: 1.8 – 2.5 MPa
* PTC Resistance: 12 – 15 mOhm
* Cap Internal Resistance: 12 – 20 mOhm
* PTC Current Rating: Non-trip 3.0 A | Trip 6.0 A
* Max Rating: Voltage 15 V | Current 40 A
* Trip Time (10 A): < 8 seconds

Material & Component Specifications (Dimensions):
* Steel Cap: 16.38 x 1.8 x 0.5 mm (Nickel-plated Carbon Steel)
* Sealing Ring: 17.45 x 4.3 x 0.5 mm (White PP)
* Explosion-Proof Disc: 16.35 x 1.32 x 0.3 mm (Aluminum)
* PPTC Thermistor: 16.35 x 10.1 x 0.3 mm (Cu, Ni, PE, C)
* Connecting Plate: 12.85 x 1.23 x 0.5 mm (Aluminum)
* Spacer Ring: 13.2 x 0.90 x 0.3 mm (High-Temp Material)
* Welding Tab: 15 x 3 x 0.15 mm (Aluminum)

Storage Conditions:
* Temperature: 0-35deg C
* Humidity: <= 75% RH
* Shelf Life: 1 Year