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Single battery detection precision, SOC detection precision and single battery 

balance have always been the challenges in battery management, and by far no 

satisfactory solution has been found. Battery management systems developed 

and designed by perfectly target at the above problems and breakthroughs have

been achieved after two-year research especially on precise estimation of 

lithium battery state of charge (SOC), dynamic monitoring of lithium battery 

working conditions as well as single battery balance. Battery management 

systems of Liyun universally adopt American Linear LTC6803 (3rd generation 

battery management test chip). With our unique ideas and innovative algorithm 

for battery management, voltage monitoring precision of our products on single 

battery reaches 0.25% with the SOC precision of less than 5%. 

   In addition, our battery management systems also enjoy powerful communication

functions. The communication interfaces of RS232 and RS485 meet all 

communications demands and the liquid crystal display, in accordance with

customer demands, shows battery power, various parameters and alarm condition. 

Real-time monitoring of single battery voltage, balanced state and battery 

life, together with settings of parameters and protection response, can be 

realized via PC client interface.

  Therefore Liyun`s BMS enjoys immense functional development potential. 

Functional development and modification of sizes can be made in conformity 

with customer demands, such as CAN communication, bluetooth communication,

communication protocol development, SMbus development, data storage, remote

monitoring, network module, kinds of liquid crystal display (touch screen, color 

screen, and LED, etc) and optical coupling independence. 

1、Application & Feature List
LY.BMS.07S40 is Battery Management System (BMS) for power batterypackage, manage up to 7 serial connected Li-ion cells, suitable for E-bike,E-motor and other power battery application with 7S cell supply.Intelligent battery management solution to multi-cell battery pack,enable very long life cycle and ultra low heat dissipation by providingaccurate cell voltage monitor,high-efficiency active cell balance andself-adaptive management method.

2、Feature list:

1. 60mA-200mA efficient real-time active balancing. 

2. Realization of upper computer making parameters and alarm settings 

without change of hardware circuits. 

3. Use of Linear LTC6803 chip, intelligent management plan and maximized 

battery capacity and battery life. 

4. LCD real-timely displays battery conditions and alarm state. 

5. Precise single voltage detection with a precision of 0.25% and a mere 

error of ± 10mV. 

6. Precision of SOC of less than 5%. 

7. Precise temperature measurement. 3-route temperature control and test 

for over 12 series. 

8. Powerful communication functions. RS232/RS485 communication 

interfaces. 

9. BMS with the smallest volume and the highest integration in the industry. 

10. Up tp 100 continuous current,Up to 200A peak current.

PC-end software:
PowerWise provide PC-end software for realtime battery pack status monitor, parameter configuration and data record. LY.BMS is conntected to PC with RS232 interface. When PC is connected to LY.BMS, PC-end software can receive realtime data of the whole battery pack from the LY.BMS.



Realtime Montior can provide realtime data display of battery pack including cell voltage, pack voltage charge/discharge current, pack temperature and LY.BMS status. It can communicate to LY.BMS with RS232 interface, get realtime data from Smart PC during charge and discharge cycle.

In parameter configuration interface, user can easily read/set some parameters of LY.BMS, including overvoltage threshold, over voltageprotection release condition, under voltage threshold, undervoltageprotection release condition, over current threshold, overtemperature threshold and so on.

LCD Display

LCD can display SOC,total Voltage,realtime Current,Temperature,

OC/OV/UV/OT alarm

Email:sales@leoyun.com