How many cells have to be penetrated to create a fire? Just the one: 'if crush or penetration occurs perpendicular to electrode edges, that deformation is like

How many cells have to be penetrated to create a fire? Just the one: 'if crush or penetration occurs perpendicular to electrode edges, that deformation is likely to result in high impedance shorting between electrode layers and initiate cell thermal runaway.'[1] This is an incredibly thorough piece of research: [1] Celina Mikolajczak et all, (2011), Lithium-Ion Batteries Hazard and Use Assessment (p. 57, paragraph 5) Retreived from: http://www.nfpa.org/~/media/Files/Research/Research%20Foundation/Research%20Foundation%20reports/Hazardous%20materials/rflithiumionbatterieshazard.pdf http://www.nfpa.org/~/media/Files/Research/Research%20Founda...