Cell The smallest electrochemical current-producing unit of a battery. The cell consists of two electrodes, an electrolyte, a separator, and a housing. When the battery discharges, the stored chemical energy is transformed into electrical energy by means of the electrochemical redox reaction.
Battery An interconnected group of several cells. In primary batteries the reactions during the discharge process are partially or completely irreversible. In other words, the battery cannot be recharged.
Rechargeable battery A secondary battery in which the discharge reactions are largely reversible. As a result, it is possible to transform chemical energy into electrical energy and vice versa multiple times.
Lithium battery A primary battery in which lithium (Li) is used as the active material in the negative electrode.
Lithium-ion battery A general term for a rechargeable battery based on lithium compounds. The reactive materials in the negative and in the positive electrode and in the electrolyte contain lithium ions. Lithium-ion rechargeable batteries have a higher specific energy than other types of rechargeable batteries. Because deep discharging or overcharging causes them to lose capacity, they need electronic protection circuits.
Lithium-polymer battery A special type of lithium-ion rechargeable battery in which the electrolyte is a solid or gelatinous polymer-based foil. This enables a more open design, for example one that is especially flat. This type of battery is mainly used in electric vehicles.