3.7v 18650 lithium battery

　　Application of 3.7v 18650 lithium battery management system

　　The 3.7v 18650 lithium battery management system has a CAN bus interface. The 3.7v 18650 lithium battery management system communicates with the electric vehicle main controller through the CAN bus interface and can transmit all monitoring data of the 3.7v 18650 lithium battery management system, including total current, maximum voltage of the unit, minimum voltage of the unit, and maximum temperature. Minimum temperature, SOC, total voltage and other data. Based on the data transmitted by the 3.7v 18650 lithium battery management system, the electric vehicle owner controller makes real-time adjustments to the control of the entire vehicle to achieve a more reasonable use of lithium power batteries and extend the service life of lithium power batteries.

　　Main technical indicators of management system

　　1. The management system adopts a modular design with a total of 10 voltage acquisition modules. Each voltage acquisition module has a temperature measurement sensor and a total of 10 temperature measurement points. Current measurement uses an independent module, and voltage collection and current collection are managed and controlled by the host computer. Voltage and current modules are standard modules.

　　2 Cell voltage sampling range 0~5V, sampling accuracy ±15mV,

　　Current sampling range 0~300A, sampling accuracy 1A

　　Temperature sampling range -20℃～80℃, sampling accuracy ±1℃

　　3 control methods

　　Voltage management:

　　When the 3.7v 18650 lithium battery pack is working (discharging), the output is limited: When the voltage of any 3.7v 18650 lithium battery drops to 3.65V (can be set), a flashing LED alarm light is lit to signal the motor controller to limit the output. Stop output: When the voltage of any 3.7v 18650 lithium battery drops to 3.3V (can be set), a relay closure signal is sent to the motor controller to control the motor to stop output. Forced disconnection: When the voltage of any 3.7v 18650 lithium battery drops to 3.0V, a red flashing LED alarm light is illuminated. After a delay of 20S, a relay closing signal is sent out, and the contactor is controlled to cut off the 3.7v 18650 lithium battery discharge main circuit. The relay contacts It is normally open.

　　When the 3.7v 18650 lithium battery pack is being charged, when the voltage of any 3.7v 18650 lithium battery exceeds 4.3V, a red flashing LED alarm light is lit, and the signal is sent to the charger. The charger is controlled to stop charging immediately, or is sent to the motor controller to stop energy. Recycle.

　　Temperature management:

　　When the 3.7v 18650 lithium battery pack is discharging, when any temperature greater than 40°C is detected, a relay closure signal is sent to start the fan. When the temperature is greater than 52°C, a red flashing LED alarm light is illuminated to the motor controller to limit the motor. Controller output. After the fan is started, when the temperature drops to 36°C, the fan stops.

　　When the 3.7v 18650 lithium battery pack is charging, when any temperature is detected to be greater than 40°C, a relay closing signal (the same as the relay above) is sent, the fan is started, and when the temperature is greater than 52°C, a red flashing LED alarm is lit. Light, signal to the charger, stop the charger output. After the fan is started, when the temperature drops to 36°C, the fan stops.

　　The light-emitting diode that lights up when the voltage exceeds 52°C is the same as the light-emitting diode that lights up when the voltage exceeds 4.3V.

　　Current control:

　　When the 3.7v 18650 lithium battery pack is discharging, the discharge current is limited to 90A, and a red flashing LED alarm light is lit. When it exceeds the limit, a signal is sent to the motor controller, and the motor controller limits the output. When the energy feedback current received by the 3.7v 18650 lithium battery pack exceeds 30A, a red flashing LED alarm light is lit and a signal is sent to stop the energy feedback of the motor controller.

　　43.7v 18650 lithium battery management system data upload computer communication

　　The main control module of the management system has a USB output interface, which can realize communication with the computer. The main control module has a CAN2.0B interface that can communicate with other devices through the CAN protocol.

　　Parameter adjustment of the management system can be completed by touching the buttons on the color screen.

　　Computer software can be used to receive 3.7v 18650 lithium battery pack working information at any time. The displayed and recorded content includes single cell voltage, temperature, current, SOC and total voltage. The recording format is Notepad or Excel. Time/voltage (current) and voltage (time)/capacity curves can be drawn and printed based on the recorded data.

　　The management module has a data saving function, which can save the last 3 days of data uploaded to the host computer by the 3.7v 18650 lithium battery pack at any time. The data content includes single cell voltage, charge and discharge current, temperature, and SOC value. The data on the memory can be read by a computer. The memory can be in the form of a flash memory or a memory card. The data can be stored in the memory for a long time.

　　5. The main control module uses a color 5.6-inch or 4.3-inch touch LCD screen, and the data sampling time is 500ms.

　　The accuracy requirement of SOC is ±8%.

　　The operating voltage of the management system is DC12V, which is provided externally.

　　The power consumption of the management system is less than 5W when working and less than 25mW in non-working state.

　　Wherever lithium-ion batteries are used, there is a 3.7v 18650 lithium battery management system. The 3.7v 18650 lithium battery management system, together with green energy, will bring a new dawn to our society.

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