Custom Lithium Ion / Polymer
House of Batteries manufactures high quality, high performance custom lithium ion (Li-ion) and lithium polymer battery packs and assemblies. Using advanced mechanical and electronic design tools, our expert battery design team will optimize the manufacturability, safety, and reliability of your custom battery packs, giving you the most dependable and cost effective lithium ion or lithium polymer battery pack solution for your needs.
View individual product specifications for custom lithium ion and lithium polymer batteries.
Custom Lithium Ion Battery Packs (Li-Ion Batteries)
Lithium ion (Li-ion) battery packs are an advanced chemistry that provides increased performance over nickel or lead based chemistries at a price premium. Li-ion and lithium polymer batteries can have as much as twice the energy density of NiCd (nickel cadmium), have relatively low self-discharge rates, and are capable of high discharge currents.
The lithium ion chemistry is available in several variations. Lithium cobalt oxide provides the greatest energy density; lithium manganese offers greater safety with lower energy density than lithium cobalt oxide; lithium iron phosphate provides high discharge rate capabilities, as well as long cycle and calendar life. Mixed cathodes can be used to optimize lithium rechargeable cells’ specific performance characteristics.
Because of lithium’s inherent volatility and lithium ion’s high energy density, every lithium ion battery pack and cell requires a special control circuit to manage its upper and lower voltage thresholds and to regulate its operating current and temperature during charge and discharge.
Lithium ion battery technology is always evolving. Better manufacturing techniques continue to bring the cost of lithium ion cells down, and new electrode materials provide improved capacities.
In general, lithium ion charge circuits are of two-stage constant current/constant voltage design. Fully discharged cells take constant current charges at a rate of 1C (1x the rated capacity), until reaching their set voltage of between 3.6 and 4.2 volts (depending on specific chemistry), a process which takes approximately one hour. The batteries’ chargers will then switch to constant voltage, with the current tapering off until the batteries are fully charged—approximately another two hours. The entire charging process is a fairly fast one, at about three hours. Lithium ion batteries may be removed from charge before they’re fully charged, with no side effects. Li-ion batteries cannot be trickle charged, as they do not tolerate overcharge conditions.
Custom Lithium Polymer Battery Packs
Lithium-ion-polymer batteries differ from lithium-ion batteries only in construction—it is not a unique and different chemistry. Li-polymer can be created in an array of chemistries, the most widely used of which is Li-cobalt. The difference in construction over conventional li-ion cells allows for lower cost, safer operation, and flexible packaging options; cells as thin as a credit card are possible. The combination of these factors makes custom lithium polymer battery packs and battery assemblies an increasingly popular choice for a wide range of applications.