We supply state of the art energy storage systems (Kokam, Yuntong, Saehan, Winston) for all types of applications including automotive, rail, construction, solar systems, industrial DC energy storage systems, marine, electric scooters, e-bikes etc.
Lithium-ion & Lithium-Polymer Packs
Customised Li-Ion Battery Pack
Battery Pack Engineering for Prototype- & Production Lithium-ion Battery Packs. Battery packs are essential elements of each EV. They are the main and only source of all energy in the vehicle and must respond to the severe requirements of safety longevity and capacity. Several aspects must be taken in consideration when planning a battery pack : temperature, maximum charge and discharge currents, over voltage protections and many others factors normally not addressed by cell manufacturers. E-Transportation offers unique experience resulting from cooperation with the world leading specialists in this area who designed high-end battery management strategies. Our battery packs are based on industrialized Battery Management System (BMS) fulfilling strict automotive requirements and unique mechanical design enabling internal temperature control over a wide range of external weather conditions. We also cooperate with several leading cell manufacturers to develop new lines of products specially designed for automotive markets.
You inform us about the packaging space (or dimensions of the pack) and the number of Amp-hours you need and we manufacture your Prototype. At higher Pack volumes, we arrange to make rotation- or injection moulded battery casings.
Casings with Lid: * For Prototypes, we use glued sheets of PVC, reinforced by L-Profiles * For Production packs, we use Polypropylene casings
Cells: The cells we're using are usually from LiFePO4 or Li-Polymer. These cells are rechargeable Lithium cells which have proven itself in the market. Rechargeable Lithium batteries, with high power, high capacity at high voltages, are the ideal energy alternatives for fuel and traction energy sources for environmental friendly transportation. It is also the optimum power source for mobile-, solar- and wind energy.
BMS: (Battery Management System) There are three main objectives common to all Battery Management Systems * Protect the cells or the battery from damage * Prolong the life of the battery * Maintain the battery in a state in which it can fulfil the functional requirements of the application for which it was specified.
The single unit Lithium-ion Cell Charge & Discharge Controller continuously monitors Over-& Under voltage. These controllers are daisy chained and give two output signals (i.e. Over-& Under voltage) through two different Optocouplers, which can be used to respectively trigger the Battery Charger and Motor Inverter. The Under voltage level is set to 2.5VDC/cell, the Over voltage level is adjustable and as a default set to 4,15VDC/cell. In the cell controllers, cell balancing takes place, so that each cell has the same voltage level as the others.
Optional: * On top of the casing, we mount either (1) standard or (2) temperature sensing blowers. These active cooling fans control the air in the pack, so that temperature of cells remains as stabile as possible. * Battery Charger, dedicated to Pack Voltage, Output Power and type of cells. Output: 50 -320VDC, Input: 230VAC/16A. * Ground Fault Interrupter (Residual Current Device); Protective device, which prevents from electrical shock by interrupting a circuit when there's a difference in the currents in the "hot" and "neutral" wires. Such a situation may occur caused by current leakage through the body of a person who is grounded and accidentally touches the energised part of the circuit * Temperature Monitor, Alarm Buzzer & Relay output; with 10 Sensors sensing the inside Pack temperature, triggering an alarm buzzer and switching a 12 VDC Relay.