What is Battery Protection Mode?

Battery protection mode is a feature that mainly protects the battery by limiting the amount of battery charging, battery charging speed, etc. to prolong the life of the battery. The Battery Protection Mode is a feature that adds a Battery Management System (BMS) inside the battery to supervise the battery to ensure that the battery meets the safety specifications and to ensure that the battery will not be damaged. If the BMS monitors any abnormal state of the battery, it will enter the protection mode (over-voltage protection, under-voltage protection, high-temperature protection, etc.) to maximize the life of the battery. The specific battery protection modes and solutions are as follows:

1. Undervoltage protection

Under-voltage protection is mainly due to insufficient voltage of the battery when charging, the battery management system (BMS) will enter into the under-voltage protection mode, and the battery will not be able to charge, which will cause the battery to be undercharged. We need to use a multimeter to measure the voltage at both ends of the battery to confirm that the battery voltage is too low, and then use a charger with an activation function to charge the battery to about 12V or 24V. (Note: The multimeter is used by inserting the red lead into the terminal labeled voltage V, and the black lead into the terminal labeled COM, then select the direct current (DC) mode, usually there are three dots underneath, and then select the measurement range, and then measure the battery).

2. High voltage protection

If the charging voltage is too high or the voltage of the battery is too high, the battery management system (BMS) will also enter the battery high-voltage protection mode, and it will cut off the function of the battery, so the battery will not be overheated inside the battery because of the high voltage, which will lead to thermal runaway or fire. If the voltage of the battery is too high, we need to disconnect the power supply, so that the voltage of the battery is restored to a safe level.

3. High temperature protection

Generally lithium batteries have a battery protection mode, under normal circumstances lithium batteries can withstand a short period of high temperature conditions, but if the temperature is too high it will activate the high temperature protection mode of the battery management system, to prevent further increases in temperature, which affects the service life of the battery. We can place the battery in a dry, well-ventilated area, you can also reduce the load on the battery, so that the battery returns to normal temperature before use. another approach is to choose a high temperature battery solution.

4. Low temperature protection

You can use the app to check the information of the battery to confirm that the battery has a low-temperature protection mode, in a low-temperature environment, the capacity and discharge ability of the battery will be reduced, and in serious cases, it will lead to crystallization inside the battery, which will cause great damage to the battery. In the event of low temperature protection, the battery should be placed in a warm environment until the battery returns to normal temperature and can be used.

5. Current protection

When a battery is overloaded or short-circuited, the battery management system (BMS) will show current protection to protect the battery from short-circuits and excessive loads that may damage the battery cells. In this case it is necessary to disconnect the load to avoid the effects of excessive loads, and the current protection mode will be disconnected when the battery can be used normally after the normal state is restored.

6. Battery itself and related line protection

When the battery itself fails, such as battery breakage, battery aging, battery internal resistance is too large, etc., the battery management system will start the protection mode, temporarily stop the battery function, when the fault is repaired, the battery can be used normally. If the connection harness of the battery is broken, fractured, etc., the battery will also be in protection mode, and you need to check the battery itself and the related wiring.

Do all batteries have a battery protection mode?

No. Battery protection mode is mainly applicable to lithium batteries, and some deep cycle batteries also have battery protection mode. Lead-acid batteries are cheaper and need our daily maintenance, such as (avoiding overcharging, avoiding over-discharging, refilling electrolyte or distilled water, physical inspection of the battery, etc.), power generation is mainly based on lead-acid chemistry, while lithium-ion batteries and deep-cycle batteries are more expensive, and the use of a battery management system can maximize the protection of the battery and prolong the battery’s service life.

Role of Battery Protection Mode

Battery protection is mainly for lithium-ion batteries and deep cycle batteries, to prevent the battery current is too large, short circuit, excessive load phenomenon, there will be extreme temperature conditions, the battery itself and the related line failure, etc., will trigger the battery protection mode, you can maximize the protection of the battery, to extend the service life of the battery.

Conclusion:

Battery protection mode can maximize the protection of our batteries, when we use the battery can maximize the best performance of the battery, to extend the life of the battery. Not all batteries have battery protection mode, we can choose the most suitable battery according to our need