Power Lithium Battery refers to the battery that provides power for transportation vehicles, which is generally relative to the small battery that provides energy for portable electronic equipment;
However, ordinary lithium battery is a primary battery with lithium metal or lithium alloy as negative electrode material and non-aqueous electrolyte solution, which is different from rechargeable battery lithium ion battery
and lithium ion polymer battery.
Different batteries: In the case of new batteries, use a discharge meter to test the battery capacity. The capacity of the general power lithium battery is 1000-About 1500 mAh;
The capacity of ordinary lithium batteries is above 2000 mAh, and some can reach 3400 mAh.
A 4200mAh power lithium battery can emit electricity in just a few minutes, but ordinary lithium batteries can't do it at all, so the discharge capacity of ordinary lithium batteries cannot be compared with that of power lithium batteries.
The biggest difference between power lithium battery and ordinary lithium battery lies in its high discharge power and specific energy.
Since the power lithium battery is mainly used for vehicle energy supply, it has higher discharge power than ordinary batteries.
The characteristics of lithium-powered batteries are described as follows :(1)The working voltage of the single battery is as high as 3.
7V is 3 times that of nickel-cadmium battery, nickel-hydrogen battery and nearly 2 times that of lead-acid battery, which is also an important reason for the high specific energy of lithium power battery.
Therefore, when forming a power battery pack with the same voltage, the number of series connections used by lithium power batteries will be much less than that of lead-acid batteries and nickel-hydrogen batteries. (2)
It is light in weight and large in specific energy, up to 150Wh/Kg, which is 2 times that of nickel-hydrogen battery and 4 times that of lead-acid battery, so its weight is 1/3 to 1/4 of that of lead-acid battery with the same energy, from this point of view, lithium battery consumes less resources, and due to the large reserves of elements used in lithium manganate batteries, the price of lead-acid and nickel-hydrogen batteries may rise further, the cost of lithium-powered batteries is further reduced. (3)
The volume is small, up to 400Wh/L, and the volume is 1/2 to 1/3 of that of lead-acid batteries.
The design conditions, design space and possibility of more reasonable structure and more beautiful appearance are provided.
At present, due to the limitation of the volume and weight of lead-acid batteries, designers' design ideas are greatly constrained, resulting in the structure and appearance of electric bicycles at this stage being 'one side by one', similar and monotonous. (4)
The cycle life is long and the number of cycles can reach 1000.
Based on the capacity of 60%, the number of 100% charging and discharging cycles of the battery pack can reach more than 600 times, and the service life can reach 3-
Five years, the life span is about two to three times that of lead-acid batteries.
With the innovation of technology and the improvement of equipment, the battery life will be 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)
The allowable working temperature range is wide, the low temperature performance is good, and the lithium power battery can be used in-
20 ° C ~ Working between 55 ° C, especially suitable for low temperature use, while aqueous solution battery (Such as lead-acid batteries, nickel-hydrogen batteries)
At low temperature, the performance will be greatly reduced due to poor fluidity of electrolyte. (7)
There is no memory effect, so it is not necessary to discharge like nickel-cadmium battery or nickel-hydrogen battery before each charging, and it can be charged anytime and anywhere.
The depth of battery charge and discharge 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. Take the power lithium battery made of lithium ferrous phosphate and ordinary lithium battery as examples, although the whole positive and negative electrode material system and structure are the same, however, the positive and negative electrode material particles of the power lithium battery are finer than the ordinary type, increase the surface area, accelerate the chemical reaction rate, and the diaphragm material and electrolyte used have better conductivity, in addition, the power of the positive and negative electrodes is also more than the ordinary type to reduce the internal resistance of the electrode and meet the larger current.
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