DEVMO 18650 4S Protection Board BMS PCM User Manual

Zavedení

This manual provides detailed instructions for the safe and effective use of the DEVMO 18650 4S Protection Board (BMS/PCM). This board is designed to manage and protect 4-series (4S) 18650 Lithium-ion battery packs, ensuring their longevity and safe operation by preventing overcharge, over-discharge, and over-current conditions.

Bezpečnostní informace

Always observe the following safety precautions when working with the BMS board and battery packs:

• Ensure all connections are correct before applying power. Incorrect wiring can damage the board, batteries, or connected devices.
• Pracujte v dobře větraném prostoru.
• Používejte vhodné osobní ochranné prostředky (OOP), jako jsou ochranné brýle.
• Avoid short-circuiting the battery terminals or the BMS output.
• Nepřekračujte stanovený objemtage a aktuální hodnocení.
• Chraňte desku před vlhkostí a extrémními teplotami.
• If the board or battery pack shows signs of damage, overheating, or unusual behavior, disconnect power immediately.

Vlastnosti produktu

• High-accuracy voltage detekční obvod.
• Low standby current consumption.
• Charger terminal utilizes high voltage zařízení.
• Built-in three-stage over-current detection circuit (over-current 1, over-current 2, or load short circuit).
• MOS transistor control for battery charge and discharge.
• Short circuit protection with automatic recovery.
• Cell balancing functionality for 4S battery packs.

Specifikace

Pokyny pro instalaci a zapojení

The DEVMO 4S BMS board requires careful wiring to ensure proper function and battery protection. Refer to the images below for visual guidance on connection points.

Figure 1: DEVMO 18650 4S Protection Board (Component Side)

This image displays the top side of the DEVMO 18650 4S Protection Board, highlighting the various connection pads and electronic components. Key labels visible include B+, B-, B1, B2, B3, P+, and P-, which are crucial for wiring the battery pack and charger/load.

Figure 2: DEVMO 18650 4S Protection Board (Solder Side)

This image shows the bottom side of the DEVMO 18650 4S Protection Board, revealing the solder pads and voltage markings such as 11.1V, 14.8V, 7.4V, and 3.7V, which correspond to the cell connection points for balancing.

Kroky zapojení:

1. Battery Pack Connection (B- and B+):
   • Connect the negative terminal of your 4S battery pack to the B- pad on the BMS board.
   • Connect the positive terminal of your 4S battery pack to the B+ pad on the BMS board.
2. Cell Balancing Connections (B1, B2, B3):

   These connections are crucial for the BMS to monitor and balance individual cells within the 4S pack. Ensure these are connected in sequence:

   • Connect the positive terminal of the 1st cell (or the negative terminal of the 2nd cell) to the B1 pad. This point should be approximately 3.7V from B-.
   • Connect the positive terminal of the 2nd cell (or the negative terminal of the 3rd cell) to the B2 pad. This point should be approximately 7.4V from B-.
   • Connect the positive terminal of the 3rd cell (or the negative terminal of the 4th cell) to the B3 pad. This point should be approximately 11.1V from B-.

   Poznámka: Voltage markings on the board (3.7V, 7.4V, 11.1V, 14.8V) correspond to the nominal voltages at these connection points relative to B-.

3. Charger/Load Connection (P- and P+):
   • Connect the negative terminal of your charger or load to the P- pad on the BMS board.
   • Connect the positive terminal of your charger or load to the P+ pad on the BMS board.

   Important: The BMS may not show voltage output on P+ and P- until a charger is connected for the first time to activate the protection circuit. This is a common behavior for many BMS boards.

After wiring, double-check all connections for polarity and correct sequencing before applying power.

Provozní principy

The DEVMO 4S BMS operates by continuously monitoring the voltage of each cell in the battery pack, as well as the overall pack current. Its primary functions include:

• Ochrana proti přebití: Prevents individual cells from being charged beyond their safe voltage limit (4.25-4.35V), extending battery life and preventing damage.
• Ochrana proti nadměrnému vybití: Disconnects the load if any cell's voltage drops below the safe minimum (2.3-3.0V), preventing irreversible damage to the cells.
• Ochrana proti nadproudu: Limits the current drawn from or supplied to the battery pack to prevent damage from excessive loads or charging currents. This includes short-circuit protection.
• Vyrovnávání buněk: During charging, the BMS balances the voltage of each cell, ensuring that all cells reach full charge simultaneously and preventing imbalances that can reduce pack capacity and lifespan.

Údržba

The DEVMO 4S BMS board is designed for low maintenance. However, following these guidelines can help ensure its longevity:

• Udržujte desku čistou a bez prachu a nečistot.
• Avoid exposing the board to excessive moisture or corrosive environments.
• Regularly inspect wiring connections for looseness or corrosion.
• Store the board and connected battery pack in a cool, dry place when not in use.

Odstraňování problémů

Podpora

For further assistance or inquiries regarding your DEVMO 18650 4S Protection Board, please contact DEVMO customer support through the platform where the product was purchased. While specific warranty details are not provided, general product support is available for operational issues and technical guidance.

Please have your product model number (18650 4S Protection Board BMS PCM) and purchase details ready when contacting support.