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What’s The Difference Between Power Battery And Energy Storage Battery?

Sep. 23, 2019

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A power lithium battery refers to a battery that powers a transportation vehicle, generally compared to a small battery that supplies energy to a portable electronic device; and a common lithium battery is a lithium metal or lithium alloy as a negative electrode material, using non-water The primary battery of the electrolyte solution is different from the lithium ion battery of the rechargeable battery. Different batteries: In the case of new batteries, the battery capacity is tested by a discharge meter. The capacity of a general lithium battery is about 1000-1500 mAh; while the capacity of an ordinary lithium battery is above 2000 mAh, and some can reach 3400 mAh.


Lithium-Ion Battery Rack

Lithium-Ion Battery Rack


A 4200mAh power lithium battery can discharge the power in just a few minutes, but the ordinary lithium battery can not do it completely, so the discharge capacity of the ordinary lithium battery can not be compared with the power lithium battery. The biggest difference between a power lithium battery and a normal lithium battery is that it has a large discharge power and a high specific energy. Since the main use of the power type lithium battery is the vehicle energy supply, it has a higher discharge power than the ordinary battery.


The characteristics of the Lithium Battery are as follows:

(1) The operating voltage of the single cell is up to 3.7V, which is three times that of nickel-cadmium batteries and nickel-hydrogen batteries, and nearly twice that of lead-acid batteries. This is also an important reason for the higher specific energy of lithium-ion batteries. Therefore, when constructing a power battery pack of the same voltage, the number of series connected to the lithium power battery is much smaller than that of the lead acid battery and the nickel hydrogen battery.

(2) Light weight, high specific energy, up to 150Wh/Kg, twice that of Ni-MH batteries, and 4 times that of lead-acid batteries, so the weight is one-third to one-fourth of that of lead-acid batteries of the same energy. From this point of view, lithium-ion battery consumption is less, and because the reserves of elements used in lithium manganate batteries are relatively large, relative lead-acid and nickel-hydrogen batteries may increase prices further, and the cost of lithium-power batteries is further reduced.

(3) The volume is small, the height reaches 400Wh/L, and the volume is one-half to one-third of the lead-acid battery. Provides design conditions, design space and possibilities for a more rational structure and a more aesthetic appearance. At present, due to the limitation of the volume and weight of lead-acid batteries, the designer's design ideas are greatly constrained, resulting in the current structure of the electric bicycle in the structure and appearance of "thousand cars one side", similar similarity, monotonous.

(4) The cycle life is long and the number of cycles can be up to 1000 times. With a capacity of 60%, the battery pack can be charged and discharged 100 times more than 600 times, the service life can reach 3-5 years, and the service life is about two to three times that of lead-acid batteries. With the innovation of technology and the improvement of equipment, the life of the battery will become longer and longer, and the cost performance will be higher and higher.

(5) The self-discharge rate is low, less than 5% per month.

(6) Allowable wide operating temperature range, good low temperature performance, lithium battery can work between -20 ° C ~ +55 ° C, especially suitable for low temperature use, while aqueous batteries (such as lead-acid batteries, nickel-metal hydride batteries) at low temperatures Due to the poor fluidity of the electrolyte, the performance is greatly reduced.

(7) There is no memory effect, so it is not necessary to discharge like a nickel-cadmium battery or a nickel-hydrogen battery before charging, and it can be charged anytime and anywhere. The depth of charge and discharge of the battery has little effect on the life of the battery. It can be fully charged and fully discharged. Our cycle test is full charge and full discharge.


The discharge rate of the power battery can be higher. The power lithium battery of the lithium iron phosphate lithium material and the ordinary lithium battery are taken as an example. Although the entire positive and negative material materials system and structure are the same, the dynamic lithium battery is The particles of the positive and negative materials are smaller than the ordinary type to increase the surface area, accelerate the chemical reaction rate, and the diaphragm material and the electrolyte have better conductivity. In addition, the lure of the positive and negative electrodes is more than the common type. Reduce the internal resistance of the ear and meet more current.


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