Vibration of lithium iron phosphate battery

How do vibrational and shock profiles affect lithium-ion batteries?

Lithium-ion batteries are increasingly used in mobile applications where mechanical vibrations and shocks are a constant companion. This work shows how these mechanical loads affect lithium-ion cells. Therefore pouch and cylindrical cells are stressed with vibrational and shock profiles according to the UN 38.3 standard.

What is the maximum frequency a lithium ion battery can vibrate?

In these tests, vibrations can either be random vibrations with an autospectral density of 0.1 g 2 /Hz or swept sine vibrations with a maximum acceleration of 5 g . For lithium-ion batteries in space applications, the NASA requires testing with random vibrations at frequencies between 20 and 2000 Hz with a peak acceleration of 13.65 g.

How do vibrations and shocks affect lithium-ion cells?

We investigated how vibrations and shocks affect lithium-ion cells. Cells were stressed with UN 38.3 profiles as well as real-world vibrational loads. Cells with a tight packaging and fixed internal components showed no damages. Post mortem analyses and μCT revealed a loose mandrel for the tested 18650 cells.

How does mechanical stress affect a lithium ion battery?

In particular, mechanical vibrations and infrequent shock loads affect all parts of a battery including its smallest energy storing part, the accumulator cell, or short cell. Mechanical stress on cell level may cause market durability failures in the long-term and, especially for lithium-ion cells, these failures might pose a safety risk.

Does a lithium ion cell respond to two different states of charge?

One is the vibration generated from the vehicle and the second is the intrusion of external elements in case of accident. In this paper, a commercially available 32,700 lithium ion cell with lithium iron phosphate (LFP) chemistry is studied for its response to both the abuse conditions at two different states of charge (SoC).

How to make lithium-iron phosphate?

Lithium-iron phosphate materials were synthesized by wet-chemical techniques. The phospho-olivine compound LiFePO 4 was prepared by solution route using iron nitrate Fe (NO 3) 3 ·9H 2 O and LiH 2 PO 4 in distilled water. The resulting precursor was heated in an alumina boat at 500 °C for 10 h under Ar/5% H 2 atmosphere to reduce Fe 3+ to Fe 2+.