Lithium battery charge equalization function -Lithium - Ion Battery Equipment

Lithium battery charge equalization function -Lithium - Ion Battery Equipment

Electric bicycle lithium-ion battery charge balance function

Lithium-ion batteries for electric bicycles have the function of charge balance, mainly because lithium-ion batteries have the advantages of small size, high energy density, no memory effect, long cycle life, and low self-discharge rate.(Lithium - Ion Battery Equipment)

1. The battery matching or the influence of the external environment causes the battery voltage of each battery to be different.

2. When the battery voltage difference between the series groups exceeds the set value, the balance circuit works, starts the balance during the charging process, and discharges the balance resistance to maximize the relative capacity of the battery pack;

3. The balance current is the value of the balance absorption current, thereby reducing the voltage rise speed of the battery. When the voltage difference between the batteries in series is less than the set value, the balancing circuit is prohibited from working.

When charging and discharging a group of electric bicycle lithium-ion batteries, considering the inconsistency of individual batteries, balanced measures can be taken to ensure safety and stability. This paper mainly analyzes the importance of balancing treatment, the realization method and the relationship with protection treatment.

The internal resistance of a high-temperature battery refers to the internal resistance of the battery when the current passes through the battery, which is generally divided into AC internal resistance and DC internal resistance.

1. Since the internal resistance of the rechargeable battery is very small, when measuring the internal resistance of the DC battery, the electrode is easily polarized, and the polarization internal resistance occurs, so the real value of the internal resistance of the rechargeable battery cannot be measured.

2. Measuring the AC internal resistance can eliminate the influence of the polarization internal resistance and obtain the real internal resistance value;

3. The AC internal resistance test method is as follows: use the battery as an active resistor, give the battery a constant current of 1000 Hz and 50ma, and perform a series of processing, such as voltage sampling, rectification and filtering to accurately measure the resistance value.

Blind use of a high-temperature battery can also cause the battery to explode and endanger life, so it is important to understand the performance of the battery.
In a high-temperature battery, if a micro-short circuit occurs, it may cause a large voltage drop during storage, that is, a large self-discharge of the battery. What factors can cause one of these phenomena?

1. The fluid that collects the burr pierces the diaphragm;

2. The width of the diaphragm is improperly designed;

3. There are large particles of powder in the slurry, and the membrane ruptures due to the local overpressure of the membrane after the battery is vacuumized;

4. Insufficient amount of adhesive or poor wettability of powder materials, resulting in insufficient fastness of the coating to the fluid, peeling of the coating and perforated diaphragm.

No matter what active materials, conductive agents, electrolytes and binders are used in high-temperature batteries, if the existence of the above factors will lead to the occurrence of micro-short circuits, we hope to pay attention.



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