Battery: Chevrolet Bolt EV vs Chevrolet Spark EV

2017 Chevrolet Bolt EV in orange

GM’s electric cars use LG Chem cells for their batteries. These cells are considered by GM’s competitor Renault-Nissan CEO, Carlos Ghosn as top notch. I understand why.

Let’s make a quick comparison between Chevrolet Bolt EV and Chevrolet Spark EV batteries.

 

Chevrolet Bolt EV battery

 

The Chevrolet Bolt EV battery is made with 288 (96s3p) LG Chem cells, each cell seems to be rated at 55 Ah and 3,75 V. This represents a total of 59,4 kWh (288 x 55 Ah x 3,75 V). The battery volume is 285 L and the mass is 435 kg, this means an energy density of 208 Wh/L and 136 Wh/kg at the battery level, not cell. The Chevrolet Spark EV battery is made with 192 (96s2p) LG Chem cells, each cell is rated at 27 Ah and 3,75 V. This represents a total of 19,44 kWh (192 x 27 Ah x 3,75 V). The battery volume is 135 L and the mass is 215 kg, this means an energy density of 144 Wh/L and 90 Wh/kg at the battery level, not cell..

 

Chevrolet Spark EV battery

 

While the Chevrolet Spark EV battery is made with 192 (96s2p) LG Chem cells, each cell is rated at 27 Ah and 3,75 V. This represents a total of 19,44 kWh (192 x 27 Ah x 3,75 V). The battery volume is 135 L and the mass is 215 kg, this means an energy density of 144 Wh/L and 90 Wh/kg at the battery level, not cell.

 

Back to comparing the batteries…

Both batteries have liquid active thermal control that is very important to keep the battery at ideal temperature, since high temperatures damage the cells.

We know that the Spark EV’s small 19,44 kWh battery can handle high charge and discharge rates, since it can provide 120 kW – 105 kW are intended to the motor – and can take up to 50 kW in CCS DC fast chargers. While Bolt’s 59,4 kWh battery can provide at least 150 kW to the electric motor and something more to the electronics.

What is still unknown is how fast the Bolt’s battery can be charged in a CCS fast charger. GM has been saying that this electric car with more than 200 miles EPA range will charge at 90 miles per 30 minutes. This means that a complete charge would take more than an hour in a CCS fast charger. But we have to take in mind that GM has to say this because virtually every CCS charger in the USA is limited to 50 kW and GM doesn’t want a class action lawsuit.

Since in Europe we already have a few 150 kW CCS fast chargers, Opel might reveal how fast the Ampera-e can actually charge. Anything less than 100 kW is a major letdown, 120 kW would be great.

 

Update: LG Chem rates Chevrolet Bolt EV’s battery capacity at 57 kWh.

 

 

More info:

http://media.chevrolet.com/content/media/us/en/chevrolet/vehicles/spark-ev/2016/_jcr_content/iconrow/textfile/file.res/16-PG-Chevrolet-Spark-EV.pdf

http://media.chevrolet.com/media/us/en/chevrolet/news.detail.html/content/Pages/news/us/en/2016/Jan/naias/chevy/0111-bolt-du.html

This Post Has One Comment

  1. Espero bem que seja capaz de carregar a pelo menos 100kW..porque carregar a 50kW só seria um autêntico tiro no pé…

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