Lithium Iron Phosphate (LiFePO₄) Battery Technology

All Rokion trucks are equipped with lithium iron phosphate (LiFePO₄) battery power charging technology. This technology is the safest reusable battery technology available and SHOULD NOT be confused with lithium polymer, lithium cobalt or lithium magnesium battery technologies that can be unstable and hazardous to operate if not managed properly.

Unlike lead acid batteries, LiFePO₄ batteries do not discharge gas during charge cycles, eliminating the need for unique ventilation systems. LiFePO₄ batteries are safe, require no maintenance, and are a reliable energy storage device.

The Battery Module itself is made up of sealed battery cells that can be arranged to fit a variety of power requirements. These battery cells are not user serviceable and are sealed inside the battery module, offering an additional level of operator and passenger safety.

The Battery Module is internally fused so that, in the unlikely event of a short circuit, the fuse will open and safely isolate the power within that module. In this instance, the failed battery module would be swapped out for a spare module and then sent back to Rokion for repair. Replacing a Battery Module this way allows for the highest amount of safety for both operators and maintenance personnel and requires no special training or tools to replace a Battery Module.

Battery Management System (BMS)

All Rokion trucks contain a sophisticated Battery Management System (or BMS) which is responsible for monitoring and controlling all power systems to ensure the utmost level of operator safety is achieved. The BMS constantly monitors the battery system to protect it from excess charge or discharge current, or from voltage that might be unintentionally applied.

The BMS is responsible for monitoring the Battery Module voltages, currents, temperatures, state of charge, and states of health of each individual cell and of the Battery Module as a whole. If safety limits are exceeded, the BMS will shut down either the electrical load or the battery power charging system, whichever is causing the condition. Temperature is monitored and the vehicle discharge or charge state is controlled by the BMS as an additional safety feature. The BMS also calculates the current level of charge, which is displayed on the User Interface Module along with indicators from the BMS for low battery pack and full battery pack conditions.

Battery Charger

Rokion trucks are equipped with SAE J1772 Charge Connectors. The SAE J1772 battery power charging system is a North American standard used to charge the vast majority of electric vehicles in North America. This ensures that no special adapters or proprietary components are required when introducing a Rokion vehicle into an operation.

There are multiple levels of safety redundancy in place when charging a Rokion truck:

• The charger itself is not a typical lead acid battery charger; it is designed to be intelligent and to detect any problems with the battery pack, shutting itself down if necessary.
• The BMS monitors each cell as well as the pack as a whole and is capable of disconnecting the charger via a relay.
• A relay within the charger requires power in order to operate. In the event that control power is lost, the battery power charging system is disabled.

Rokion has made every effort to ensure the battery power charging system is as safe and as user-friendly as possible.