pack is more promising.
1. With the growth of market demand, the electric vehicle lithium battery industry has exploded rapidly, leading many people in the industry to join the lithium battery team, and the number of factories of the PACK lithium battery testing center has also increased. Cell is on a downward trajectory and the pack is more promising.
2. The lithium ion battery pack has the advantages of high energy density, high voltage, environmental protection, long life and fast charging. The individual cells form a battery and the voltage supplied is between 3V and 3V. Time 4v. and short lifespan.
PACK generally refers to combination batteries. The PACK can be a single battery, such as cell phone batteries, digital camera batteries, MP3, MP4, e batteries.tc., or it may be a series-parallel combined battery, such as laptop batteries, medical equipment batteries, communication power supplies, electric vehicle batteries, emergency power supplies, etc.
Batteries connected in parallel and series should be of the same type and model, and the difference in capacity, internal resistance and voltage should not exceed 2%. The main thing is the consistency of the battery charge and discharge curve (dynamic consistency). But it's difficult to do. Generally, after batteries are combined in parallel and series, the capacity will be lost 2-5%. The more batteries there are, the greater the capacity loss.
Detailed informationA. Overload protection. Batteries of different systems have different overcharge protection voltages. Generally, iron phosphate overload protection andof lithium is 3.65 V to 3.85 V, lithium cobalt oxide and lithium manganate. The overcharge protection voltage of ternary material lithium battery is 4.2V~4.35V.
B. Over-discharge protection, the over-discharge protection voltage of lithium iron phosphate is 2-2.5V, and the other three lithium batteries are 2.3-2.9V.
C. Short circuit protection. Determined by the parameters of the IC and MOSFET. Different integrated circuits and MOSFETs have different short circuit protection values.
D. Overload protection recovery voltage. Integrated circuits all have this function and the recovery voltage is usually 0.1-0.2V lower than the protection voltage.
E. Overdischarge protection recovery voltage. Some integrated circuits do not have this function. After uDo not overdischarge, it must be restored by charging.
F. Short circuit protection delay time. Usually ten milliseconds.
Function G. Balance. Some applications require equalization functionality. Since the battery discharge current is large, balancing is difficult to achieve. Currently, load balancing is mainly used. The purpose of balancing is to ensure that each battery can be fully charged, extend its life and maximize its function.