20S 24S 60V 72V 75A smart BMS for Battery Rental Replacement

This FY•X high quality 20S 24S 60V 72V 75A smart BMS for Battery Rental Replacement is a BMS specially designed by Huizhou Feiyu New Energy Technology Co., Ltd. for electric bicycle battery packs in the rental market. It is suitable for 20-cell lithium batteries with different chemical properties, such as lithium ion, lithium polymer, lithium iron phosphate, etc.

The BMS is equipped with a GPRS module, which can promptly report the battery pack positioning information and the corresponding voltage, current, temperature, and protection status information of the battery pack. It supports powerful functions such as remote lossless upgrade of firmware and remote locking of the battery pack.

It has a CAN communication interface that can be used to set various protection voltage, current, temperature and other parameters, which is very flexible. And the charging cabinet is identified through CAN communication. Non-designated charging cabinets cannot charge the battery pack normally. The charging cabinet is supported to upgrade the firmware function of the BMS through CAN communication without loss. The protection board has strong load capacity and the maximum sustainable discharge current can reach 75A.

Functional characteristics

● 20 batteries are protected in series.

● Charging and discharging voltage, current, temperature and other protection functions.

● Output short circuit protection function.

●Two-channel battery temperature, BMS ambient temperature, FET temperature detection and protection.

● Passive balancing function.

● Accurate SOC calculation and real-time estimation.

● Protection parameters can be adjusted through the host computer.

● CAN communication can monitor battery pack information through the host computer or other instruments.

● Multiple sleep modes and wake-up methods.

● With HALL detection function (discharge control).

● With HALL detection function (address coding).

Physical reference picture

Figure 1: BMS front view, for reference only

Figure 2: Physical picture of the back of BMS, for reference only  

Electrical parameters (Ta = 25 ℃.)

Note: 1. Different chips have different power consumption;

The above parameters are recommended values and users can modify them according to actual applications.

BMS principle block diagram

Figure 7: Protection principle block diagram

PCB size structure diagram            

Figure 12: Dimensions after assembly:: 140*80 Unit: mm Tolerance: ±0.5mm

Protection board thickness: less than 20mm (including components)

Port Definition (the picture does not match the actual object and is for reference only)

Figure 11: Protection board wiring diagram

Port definition description:

Figure 12: 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.

Preparation: As shown in Figure 11, 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: Connect the P-/C- wire to the P-/C- terminal 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 positive terminal of the battery pack to B+ of the protection board;

Step 4: Connect the battery pack and battery rows to J7 on the protection board;

Step 5: Connect the battery pack and battery rows to J3 of the protection board;

Step 6: Charge and activate.

Steps to remove the protective plate:

Step 1: Disconnect all chargers\loads

Step 2: Unplug the battery pack and battery strip connector J3;

Step 3: Unplug the battery pack and battery strip connector J7;

Step 4: Remove the connecting wire connecting the positive pole of the battery pack from the B+ terminal of the protective plate

Step 5: Remove the connecting wire connecting the negative pole of the battery pack from the B- terminal of the protective plate

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

BOM list of main components

Note: If SMD transistor: MOS tube is out of stock, our company may replace it with other models with similar specifications, and we will communicate and confirm.

ordering information

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

2 Protection board model - (This protection board model is Fish24S001, 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 20S battery packs);

4 Charging current value - 75A means the maximum support for continuous charging is 75A;

5 Discharge current value - 75A means the maximum support for continuous charging is 75A;

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, this product C stands for CAN communication;

9 Hardware version - V1.1 means the hardware version is version 1.1.

10 The model number of this protection board is: WH-Fish24S001-20S-75A-75A-100R-4-C-V1.1. 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 a battery aging cabinet to measure the voltage of each cell in the battery pack, otherwise 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 severely degraded and may even be damaged. In order not to damage the battery, the user should not charge the battery for a long time (the battery pack capacity is greater than 15AH, and the storage exceeds 1 Months) When not in use, it needs to be charged regularly to replenish the battery; when in use, it must be charged in time within 12 hours after being discharged to prevent the battery from being discharged to 0V due to self-consumption. Customers are required to have an obvious sign on the battery casing that the user regularly maintains 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 the model or brand of some materials according to the order materials without further notification.

7. The short-circuit protection function of this management system is suitable for a variety of application scenarios, but it does not guarantee that it can be short-circuited under any conditions. When the total internal resistance of the battery pack and short-circuit loop is less than 40mΩ, the battery pack capacity exceeds the rated value by 20%, the short-circuit current exceeds 1500A, the inductance of the short-circuit loop is very large, or the total length of the short-circuited wire is very long, please test by yourself to determine whether This management system can be used.

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 before it can be used.

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. After assembling the battery pack and management system, if you find no voltage output or failure to charge when you power on for the first time, please check whether the wiring is correct.