Several specifications of lithium battery packs

Perhaps the first and most important statement we can make about battery packaging is this: there is no standard size lithium-ion battery pack and there is not likely to be one in the near future.

Crucial factors for the characteristics and service life of a lithium-ion battery are, among other things, cell chemistry, the build quality of the battery cells, and the usage profile. The maximum depth of discharge of lithium-ion batteries can reach up to 100 percent, most batteries on the market, however, range between 70 and 95 percent.

Lithium-ion cells of various form factors, such as cylindrical, prismatic, or pouch cells, are integrated into battery modules, several modules are combined into a battery pack through serial and parallel connection of cells.

The Volt pack, branded “Voltec” by GM uses a total of 288 lithium-ion pouch-type cells assembled into four modules. Each cell is separated by a plastic frame on one side and an aluminum cooling fin on the other side.

The cells are also subject to degradation (loss of capacity and performance due to ageing), which can be taken into account in the product life cycle. Crucial factors for the characteristics and service life of a lithium-ion battery are, among other things, cell chemistry, the build quality of the battery cells, and the usage profile.

Power and energy. Typically, Lithium-ion battery packs operate at a C-rate of 0.5-2. Buffer storages in combination with renewable energies, load management (peak shaving), grid services (especially frequency control), emergency power supply.