20S 72V 25A Hardware BMS Dual Lithium Ion Battery Packs for E-Unicycles

This FY•X advanced 20S 72V 25A Hardware BMS Dual Lithium Ion Battery Packs for E-Unicycles is a protective plate solution specially designed by Huizhou Feiyu New Energy Technology Co., Ltd. for unicycle 20-string battery packs; it can be applied to different chemical properties.Lithium batteries, such as lithium ion, lithium polymer, etc. The protection board has strong load capacity, and the maximum continuous current can be 30A.

FY•X 20S 72V 25A Hardware BMS Dual Lithium Ion Battery Packs for E-Unicycles Functional characteristics

● 20 batteries are protected in series;

● Charging and discharging voltage, temperature and other protection functions;

● Discharge alarm function;

● The switch controls the on/off function.

● Shut down to reduce power consumption.

Physical reference picture

Figure 1: BMS front view (for reference only, the actual object shall prevail)

Figure 2: Physical picture of the back of BMS

Electrical Characteristic (Ta = 25 ℃.)

Function Description

1. Turn on the machine: Connect the ON/OFF terminal to the 200K resistor of the light touch switch to B+). Short press the switch for 1 second to turn on the machine. The P+ and P- output ports have output and can be discharged normally;

2. Shut down: Press and hold the switch for 20-30 seconds, the P+ and P- output ports will turn off the output, and the discharge will stop;

3. Secondary FUSE fuse condition: The charging circuit current for abnormal charging detection is 210~450mA or more, and the charging overvoltage condition is met. The FUSE fuses with a delay of more than 10 seconds. Once the FUSE fuses, it cannot be restored and needs to be replaced.

4. Cell overcharge protection and recovery: When the voltage of any cell is higher than the cell overcharge protection setting value, and the duration reaches the cell overcharge delay, the system enters the overcharge protection state and turns off the charging MOS. The battery cannot be charged.

After the cell overcharge protection, when the voltage of all cells drops below the cell overcharge recovery value, the overcharge protection state is released.

5. Monomer over-discharge protection and recovery: After power-on, when the lowest node voltage is lower than the monomer over-discharge protection setting value, the alarm signal will be output after a delay of 5-10 seconds. When the continuous alarm time reaches 25-30 seconds, the system Enter the over-discharge protection state, turn off the discharge MOS, and cannot discharge the battery. If the over-discharge protection state lasts for more than 30 seconds, the microcontroller will power off and enter deep sleep.

After the cell over-discharge protection occurs, charging the battery pack can release the over-discharge protection state.

6. Charging temperature protection: BMS has a battery core temperature detection NTC, which is placed near the battery core for battery core temperature detection.

Charging high and low temperature protection and recovery

When the NTC detects that the temperature of the cell surface is higher than the set high temperature protection temperature or lower than the set low temperature protection temperature, and the duration reaches the charging temperature delay (6-10 seconds), the system enters the charging temperature protection state. The charging MOSFET is turned off, and the battery pack cannot be charged in this state.

When the temperature of the cell surface drops to the high temperature recovery set value or is higher than the low temperature recovery set value, the BMS recovers from the high temperature state and can be recharged.

7. Discharge temperature protection:

Discharge high and low temperature protection and recovery

When the NTC detects that the temperature of the cell surface is higher than the set high temperature protection temperature or lower than the set low temperature protection temperature, and the duration reaches the discharge temperature delay (6-10 seconds), the system enters the discharge temperature alarm state. When the continuous alarm time reaches 25-30 seconds, the system enters the discharge temperature protection state, the discharge MOSFET is turned off, and the battery pack cannot be discharged in this state.

BMS principle block diagram

Figure 7: Protection schematic diagram

PCB size structure diagram

Figure 8: Dimensions 108.5*86.8 Unit: mm Tolerance: ±0.5mm

Protection board thickness: less than 10mm (including components)

Front wiring diagram            

Back wiring diagram

Port Definition

Figure 9: Protection board wiring diagram (for reference, the actual product shall prevail)

Port definition description:：

Figure 10: Schematic diagram of battery connection sequence

Precautions for connecting the protective board and the battery core

Warning: When connecting the protective plate to the battery cells or removing the protective plate from the battery pack, the following connection sequence and regulations must be followed; if operations are not performed in the required order, the components of the protective plate will be damaged, resulting in the protective plate being unable to protect the battery. core, causing serious consequences.

If the parallel machine is being charged in the car, it is necessary to disconnect the negative pole of the car, otherwise the charging may not be protected or the BMS may be damaged.

Preparation: According to the definition shown in Figure 9, connect the corresponding voltage detection cable to the corresponding battery core. Please pay attention to the order in which the sockets are marked.

Steps to install protective board:

Step 1: Weld the P, C-, CTRL, ONF, PG, UD- lines to the corresponding positions of the protection board without connecting the charger and load.

Step 2: Connect the negative pole of the battery pack to B- of the protection board;

Step 3: Connect the battery pack and battery rows to J1 of the protection board;

Step 4: Connect the positive terminal of section 10 of the battery pack to B10 of the protection board;

Step 5: Connect the battery pack and battery rows to J2 of the protection board;

Step 6: Connect the positive terminal of the battery pack to B+ of the protection board;

Steps to remove the protective plate:

Step 1: Disconnect all chargers\loads

Step 2: Remove the connecting wire connecting the positive electrode of the battery pack from the B+ pad of the protective plate

Step 3: Unplug the battery pack and battery strip connector J2;

Step 4: Remove the connecting wire connecting section 10 of the battery pack from the B10 pad of the protective board

Step 5: Unplug the battery pack’s battery strip connector J1;

Step 6: Remove the connecting wire connecting the negative electrode of the battery pack from the B- pad of the protective plate

Additional notes: Please pay attention to electrostatic protection during production operations.

BOM list of main components

Note: If SMD transistors and MOS tubes are out of stock, our company may replace them with other models of similar specifications.

Ordering information

1 Huizhou Feiyu New Energy Technology Co., Ltd. logo;

2 Protection board model - (This protection board model is Fish20S001, other types of protection boards are marked, there is no limit to the number of characters in this item)

3. The number of battery strings supported by the required protection board - (this model of protection board is suitable for 17S battery packs);

4 Charging current value - 10A means the maximum support for continuous charging is 10A;

5 Discharge current value - 30A means maximum support for continuous 30A charging;

6 Balance resistance size - fill in the value directly, for example, 100R, then the balance resistance is 100 ohms;

7 Battery type - one digit, the specific serial number indicates the battery type as follows;

8 Communication method - one letter represents a communication method, I represents IIC communication, U represents UART communication, R represents RS485 communication, C represents CAN communication, H represents HDQ communication, S represents RS232 communication, 0 represents no communication, product UC Represents UART+CAN dual communication;

9 Hardware version - V1.0 means the hardware version is version 1.0.

10 The model number of this protection board is: WH-Fish20S001-20S-5A-30A-0-4-0-V1.4. Please place the order according to this model number when placing bulk orders.

Also note:

1. When performing charge and discharge tests on the battery pack with the protective board installed, please do not use the battery aging cabinet to measure the voltage of each cell in the battery pack, otherwise there may be

The protective board and battery may be damaged. .

2. This protection board does not have a 0V charging function. Once the battery reaches 0V, the battery performance will be seriously degraded and may even be damaged. In order not to

If the battery is damaged, the user needs to charge it regularly to replenish the power when not in use for a long period of time (battery pack capacity is greater than 15AH, storage exceeds 1 month); and

After being discharged during use, it must be charged in time within 12 hours to prevent the battery from being discharged to 0V due to self-consumption. Customers are required to have a clear label on the battery casing.

Display the user's instructions for regular maintenance of the battery.

3. This protection board does not have reverse charging protection function. If the polarity of the charger is reversed, the protection board may be damaged.

4. This protective board shall not be used in medical products or products that may affect personal safety.

5. Our company will not be responsible for any accidents caused by the above reasons during the production, storage, transportation and use of the product.

6. This specification is a performance confirmation standard. If the performance required by this specification is met, our company will change some materials according to the order materials.

The model or brand of the material will not be notified separately.

7. This management system has no discharge overcurrent and short circuit protection functions. Please test by yourself to determine whether you can use this management system.

8. When welding battery leads, there must be no wrong connection or reverse connection. If it is indeed connected incorrectly, the circuit board may be damaged and needs to be retested to pass the test.

It can be used later.

9. During assembly, the management system should not directly contact the surface of the battery core to avoid damaging the circuit board. The assembly must be firm and reliable.

10. During use, be careful not to touch the lead tips, soldering iron, solder, etc. on the components on the circuit board, otherwise the circuit board may be damaged.

Pay attention to anti-static, moisture-proof, waterproof, etc. during use.

11. Please follow the design parameters and usage conditions during use, and the values in this specification must not be exceeded, otherwise the management system may be damaged. Place the battery pack

After being combined with the management system, if you find no voltage output or no power when powering on for the first time, please check whether the wiring is correct.

Note: After your company receives the prototype and specifications, please reply promptly. If there is no reply within 7 days, our company will regard your company as having recognized the specifications and send the prototype. If your order exceeds 50 PCS, you need to sign back the acknowledgment letter. If you do not sign back, our company will also regard your company as having approved this specification and send the sample machine. The pictures in the specification are of general models and may be slightly different from the sample delivered. Huizhou Feiyu New Energy Technology Co., Ltd. reserves the right of final interpretation of this specification.