E-Truck Lithium Battery System Case
Zhongyi Lithium batteries are used in various trucks, from commercial delivery vehicles to medium-sized electric trucks, as well as refrigerated transport vehicles for transporting food and medicine. For truck fleets, reducing reliance on fossil fuels can ensure long-term cost savings and sustained energy costs, thereby mitigating price fluctuations associated with gasoline or diesel vehicles.
Lithium Battery System Introduction
The system is composed of 48 modules and a box including line contactors, precharge contactor, precharge resistor, fuses, VMU and BMS.
Interface between VMU and BMS:
+12V, 0V: the supply of the BMS from VMU is isolated from chassis. Characteristics: +12V, 900mA.
CAN bus: CAN L and CAN H. This CAN is dedicated to the link between VMU and BMS.
EM: this signal from BMS is connected to the VMU ground input. This allows the closing of the line contactors and their opening if safe needed.
IGN: this VMU+12V output wakes up the BMS.
The CAN bus is used to exchange data between VMU and BMS.
Characteristics of the CAN bus:
- CAN 2.0B
- 250kbits/s
Lithium Battery System Parameter
| one battery system | 48pcs powermodule-12.8V150Ah in series |
| system nominal voltage | 614.4V |
| System nominal capacity | 150Ah |
| Battery System Configuration | |
| Battery Module Type | PowerModule-12.8V150Ah |
| Number of Modules in Series | 48 |
| Number of Modules in Parallel | 1 |
| Total Number of Battery Modules | 48 |
| Type of Modules Interconnect | Series strings in Parallel |
| Battery Management Unit Type | BMS_LV(10-150V) |
| CAN bus speed | 250Kbits/s |
| VMU Present | Yes |
| BMS Control Over Discharge Path Contactor | Yes |
| BMS Control Over Charge Path Contactor | Yes |
| Using Same Contactor for Charge/Discharge Path | No |
| Feedback Sense Coil for Discharge Path Contactor | Yes NC |
| Feedback Sense Coil for Charge Path Contactor | Yes NC |
| Feedback Sense Coil for Discharge Path Pre-charge Auxiliary Contactor | No |
| Feedback Sense Coil for Charge Path Pre-charge Auxiliary Contactor | No |
| How to Open Charge or Discharge Contactor for Protection | BMS Cut Off Directly |
| BMS Fault (0V = Normal, 12V = Fault) | Yes |
| 12 Volt Ignition Enable (0V = Sleep, 12 V = Enable Battery) | Yes |