UL 1642 is the safety standard for lithium battery cells intended for use in several applications, including lithium-ion ESS. Many of the required tests are similar to what is required in UL 1973 but focused on the cell’s performance.

UL 1642: Testing

Cells undergo several abuse tests to ensure the battery does not catch fire or explode and, in some tests, must also not vent or leak.

• Electrical: Tests include short circuit, abnormal charging, and forced discharging
• Mechanical: The cell is subjected crush, impact, shock, and vibration testing
• Environmental: Exposure to heating, temperature cycling, and low pressure (altitude)
• Projectile: Exposure to fire to ensure that when becoming projectile, it is unable to penetrate a mesh screen surrounding the cell