Pressure mapping technology has several other uses to test lithium-ion battery durability and design, including from within different operating environments (e.g: responses to airplane cabin pressure changes), high-speed impacts, and other tests.
Figure 1: Display of peak pressure changes while a lithium-ion battery is in use within a device. As shown in Figure 1, a pressure mapping sensor was positioned between an electronic device and a lithium-ion battery to capture changes in pressure under different operating conditions.
Imposing a higher pretension force normally causes the surface pressure of lithium metal batteries to increase. This is because the pretension force enables the components inside the battery to come into closer contact, increasing the contact pressure between the surfaces.
The pressure increase improves the cycle life of lithium metal, reduces lithium’s migration curvature in the diaphragm, and avoids direct contact between the positive and anode electrodes that can cause internal short circuit in the battery. 2. Experiments 2.1. Experiment Subjects and Experiment Platforms
The performance impacts of constant pressure on lithium-ion pouch cell is relatively unknown. As previously discussed, constant pressure research has been previously focused on low amplitude (< 40 N Jiang et al. ) or amplitudes above 1 MPa for lithium-metal chemistries .
As battery designers know, safety vents are necessary in lithium-ion battery designs to dissipate rising temperatures that can lead to thermal runaway. However, any defects in the vents can cause the temperature and an unsafe amount of pressure to build up in the battery.