1. Prodotto finitoview
The Youmile 5S 20A 18V 21V Li-Ion Lithium Battery Charger Protection Board (BMS) is designed for 5-series lithium-ion battery packs, primarily used in power tools. It integrates a specialized IC to monitor real-time voltage, charge/discharge current, and ambient temperature for each battery cell. This board ensures the longevity and safety of your battery pack by providing multiple protection functions.
Figure 1: The Youmile 5S 20A BMS board, accompanied by a nickel strip and a DC male cable, as included in the package.
2. Contenuto della confezione
- 1 x 5S Lithium Battery Charging Protection Board
- 1 x 39-inch (1m) Nickel Strip
- 1 x DC Male Cable
3. Specifiche
| Parametro | Valore |
|---|---|
| Volume di caricatage | 18V / 21V |
| Working State Current | 25µA (at 25°C) |
| Stand-by State Current | 6µA (at 25°C) |
| Single Cell Charge Voltage | 3.8V / 4.25V |
| Temperatura di conservazione | -40°C to 125°C (RH≤75%) |
| Temperatura di esercizio | -40°C to 85°C (RH≤75%) |
| Corrente di scarica continua | 8-20A |
| Discharge Main Circuit Internal Resistance | 30 ± 5mΩ |
| Temperatura di protezione | 70 ± 5 ° C |
| Temperatura di recupero | 55 ± 5 ° C |
| Dimensioni (circa) | 46 mm x 40 mm (1.81 pollici x 1.57 pollici) |
Figure 2: Approximate dimensions of the BMS board.
4. Configurazione e installazione
Proper wiring is crucial for the correct and safe operation of the BMS board. Always ensure power is disconnected before making any connections.
Schema elettrico
Refer to the wiring diagram below for connecting the battery cells to the BMS board. The board is designed for 5-series lithium-ion batteries.
Figure 3: Detailed wiring diagram for connecting the 5-series battery cells to the BMS board. Ensure correct polarity and sequence for each cell connection.
Punti di connessione:
- B+: Battery Positive (Overall positive terminal of the battery pack)
- B-: Battery Negative (Overall negative terminal of the battery pack)
- B1: Connection point for the positive terminal of the 1st battery cell.
- B2: Connection point for the positive terminal of the 2nd battery cell.
- B3: Connection point for the positive terminal of the 3rd battery cell.
- B4: Connection point for the positive terminal of the 4th battery cell.
The provided nickel strip can be used for making robust connections between battery cells and to the BMS terminals. The DC male cable is for connecting a charger to the board's DC input jack.
Figura 4: un example of the BMS board integrated into a battery pack for a power tool, demonstrating the wired connections to individual battery cells.
Nota importante sulla sicurezza: Incorrect wiring can damage the BMS board, battery cells, or connected devices, and may pose a fire hazard. If you are unsure about the wiring process, seek assistance from a qualified professional.
5. Funzionamento
Once properly installed, the BMS board operates automatically to protect your battery pack during charging and discharging cycles. Its primary functions include:
- Protezione da sovraccarico: Prevents individual cells from being charged beyond their safe voltage limit, extending battery life.
- Protezione da scarica eccessiva: Interrompe la scarica quando le celle raggiungono il loro volume minimo sicurotage, preventing deep discharge damage.
- Protezione da sovracorrente: Limits the current drawn from the battery pack to prevent damage from excessive loads.
- Protezione da cortocircuito: Immediately cuts off power in the event of a short circuit, protecting the battery and connected equipment.
- Protezione da sovratemperatura: Monitors the board's temperature and shuts down operation if it exceeds safe limits (70 ± 5°C), resuming when it cools down (55 ± 5°C).
The low power consumption of the board (working current approx. 25µA, stand-by current approx. 6µA) ensures minimal drain on the battery when not in active use.
6. Manutenzione
The Youmile BMS board is designed for reliable operation with minimal maintenance. To ensure optimal performance and longevity:
- Keep the board clean and free from dust and debris.
- Avoid exposing the board to excessive moisture or extreme temperatures outside its specified operating range.
- Regularly inspect all wiring connections for looseness or corrosion, especially if the battery pack is subjected to vibrations or frequent handling.
- Store the battery pack with the BMS in a cool, dry place when not in use.
7. Risoluzione Dei Problemi
If you encounter issues with your BMS board or battery pack, consider the following troubleshooting steps:
No Charge/Discharge:
- Controllare il cablaggio: Verify all connections (B+, B-, B1, B2, B3, B4) are secure and correctly wired according to the diagram. Incorrect wiring is a common cause of malfunction.
- Volume cella della batteriatage: Misurare il volumetage of each individual battery cell. If any cell is significantly out of balance or below its minimum voltage, the BMS may enter a protection state.
- Over-current/Short Circuit: Disconnect the load and charger. Check for any short circuits in the wiring or the connected device. The BMS may have activated its over-current or short-circuit protection.
Surriscaldamento:
- Controllo del carico: Ensure the continuous discharge current does not exceed the specified 20A. Excessive load can cause the board to overheat.
- Ventilazione: Ensure adequate airflow around the BMS board, especially if it's enclosed within a battery pack.
- Resistenza interna: High internal resistance in battery cells or poor connections can lead to heat generation.
If the issue persists after performing these checks, it may indicate a faulty BMS board or battery cells. Professional assistance may be required.
8. Garanzia e supporto
For information regarding returns or specific product support, please refer to the purchase platform or contact the seller directly. The standard return policy for this product is 14 days from the date of purchase.
For technical inquiries or further assistance, please reach out to YoumileDirect, the seller of this product.
