GM has always been pretty good about showing us the details of its technology. Now it’s showing off the upcoming Bolt’s electric powertrain in a series of detailed photos.

The Bolt represents the pinnacle of GM’s electric technology, and it’s particularly interesting to see how that has been steadily improving. We get an up-close look at the Bolt’s battery pack, and a side-by-side shot of the new pack compared to those used in the Volt and the Spark EV. A cutaway shot of the power unit shows how the electric motor and transmission are integrated to save space and weight.

Greg Smith, Engineering Group Manager, Electrification, left, Tim Grewe, General Director, Electrification, center, and Stephen Poulos, Global Chief Engineer, Electrification, right, discuss their work with a Chevrolet Bolt EV battery pack. (Photo by Jeffrey Sauger for General Motors)

A Chevrolet Bolt EV battery pack, far right, is compared to battery packs from, left to right, a first generation Volt, a second generation Volt, and a Spark EV. (Photo by Jeffrey Sauger for General Motors)

A Chevrolet Bolt EV battery pack. (Photo by Jeffrey Sauger for General Motors)

A Chevrolet Bolt EV battery pack. (Photo by Jeffrey Sauger for General Motors)

A Chevrolet Bolt EV battery pack. (Photo by Jeffrey Sauger for General Motors)

A Chevrolet Bolt EV drive unit. (Photo by Jeffrey Sauger for General Motors)

A Chevrolet Bolt EV drive unit. (Photo by Jeffrey Sauger for General Motors)

Source: GM via CNET