AFAIK, the additional shielding around the battery is in the tunnel area and does not provide additional shielding on the bottom of the battery. There are pictures of the installation of the reinforcements and they appear to be only in the tunnel area. The pictures can be seen at
Thanks so much for posting these photos... Very interesting how this process is done.
I might need to investigate my 2012 Volt. I always assumed that since it was delivered to the dealership in May 2012, that the enhancement was done prior to leaving the factory, or that the mod was incorporated into the mid-model year 2012 Volts.
Also, @ Billy, forget the Police TIRES... stay with the low resistance tires. I've had problems with always having to inflate the Goodyear tires on my Volt and I found a plastic bar code label on the Goodyear tires (in of all places) glued onto the tire where it mates with the wheel. It was pretty obvious to me, that the bar code MIGHT be the culprit for my leaking Goodyears. I had them all removed and am having not problems since then... On a side note, I bought a used Volt aluminum wheel on Ebay for $100 and then headed down to the local tire store and instead of buying a Goodyear, I bought a Michelin... I now have a "real" spare to keep in one of the barns at my place, in case I get another flat... and I have had flats from sidewall punctures because of cactus needles.
I'm very suspect that the OP has someone living in his neighborhood related to Rush Limbaugh, and who for spite, is poking holes in the sidewalls of his Volt... It might even be Rush himself, or Glenn Beck, who pecks at Volts.