Not every battery maker is a household name. There are many small battery manufacturers who are making advanced batteries to power a variety of electric vehicles from golf carts to heavy-duty trucks. Kokam, for example, a Korean company with manufacturing facilities in the United States, has just announced its new XPAND lithium-ion battery system.
The XPAND system uses lithium-nickel-manganese-cobalt battery cells in two basic sizes — 7.1 kWh or 11.4 kWh. The individual packs can be added together for a total of 1.5 megawatt-hours of battery storage, depending on the needs of the customer. The individual packs are liquid cooled, have a lifespan of 6,000+ discharge cycles, and have a maximum energy density of 150 watt-hours per kilogram.
For comparison purposes, the current batteries in the Tesla Model S and Model X have an energy density of around 135 watt-hours per kilogram — although, the batteries for the upcoming Model 3 are expected to have a higher energy density.
Such large lithium-ion battery packs may not be ideal for passenger cars but could be perfect for powering buses and large trucks. Recently, a consortium of mayors from cities across the United States have asked for proposals for such things as electric fire trucks and trash hauling vehicles.