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Model Li-48/60

Model Li-36/60

 

General

The Models Li-48/60 and Li-36/60 are complete and integrated Lithium Ion Battery products. It is suitable for use in powering 48 and 36 Volt low speed leisure applications (such as golf carts) electric vehicles. Lithium Boost technologies, Inc has developed and owned the intellectual property (IP).

 

Batteries

This product utilized best-in-class CALB CA series 60AH LiFePo4 cells. Each unit requires 15 (48V) and 11 (36V) cells, each with a 60 Amp-Hour rating. The Lithium-Ion cells are the same safe type used in most new full size electric vehicles. The cells are configured and installed to minimize space requirements in the vehicle. Cells are charged to approximately 3.65 volts when full, and in use drops down into the 3.4 to 3.3 volt range until completely discharged at about 2.95 volts.

The weight of the system is approximately 92 lbs for 48V and 68 lbs for the 36 Volts. When used correctly, the cells are warranted for 4 years; 3 years full replacement and the fourth year prorated.

 

Charger

For optimum performance it is important that the cells are kept charge balanced with one another. To accomplish this quickly and efficiently, the charging function consists of 15 (48V) and 11 (36V) individual chargers functioning in concert, all of which are mounted together in a charger module. This arrangement insures each cell receives a full charge as indicated by its individual charge indicator light turning from red to green. Each individual charger delivers 10-12 amps during most of the charge cycle, and tapers off to a trickle charge near the end of charge. The 10A charger module accepts AC power in the range of 100-240 Volts, 50-60 Hz. Charge time for fully discharged (80% DOD) cells is approximately 9-10 hours.

 

Battery Management System  (BMS)

The function of the BMS is to enable vehicle operation when all the cell voltages are in the acceptable range (>=2.95 volts). Conversely it will disable it when any cell voltage remains too low for an extended period of time. Low voltage excursions for short periods are common when starting from a stop and on steep grades, especially when cell energy is low. These are caused by internal cell resistances under load and are tolerated by the BMS. Our proprietary technology is able to differentiate between a normal work load low voltage variation state and a complete discharge of the system below 2.95 volts. The system (BMS) will switch to a discharge mode when determining a discharge state.

The BMS also features a “limp home” mode actuated by a push button switch. This can be invoked if the vehicle is shut down because the cell voltages are too low. It allows a one-time additional three minutes of operation to move the vehicle to a better location. The limp home function is re-enabled when the cells are recharged.

The BMS monitors cell voltages through wires connected to them. A complete set of wiring is provided with the product, along with wiring diagrams and installation instructions. A customized gauging system for Lithium technology is provided.



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