Safety of lithium iron phosphate batteries:
The chemical properties of lithium iron phosphate materials are very stable, especially at high temperature. Even at a very high temperature, it cannot decompose and release oxygen. Therefore, the safety function of lithium iron phosphate battery is very good, and it is not easy to be exposed to risks such as incineration and blasting. Coupled with a reasonable structural design, its safety has been further improved, so that the battery in the impact, acupuncture, short circuit and other circumstances are not burning and blasting. After the lithium iron phosphate battery is fully charged, the battery is quickly pierced with steel nails with a diameter of 8 mm, and the voltage and temperature changes of the battery are recorded together.
At the initial stage of the nail piercing, the battery voltage drops rapidly due to the internal short circuit, and the battery temperature rises due to the required amount of heat released. However, after the puncture, the internal vacuum of the battery decreased significantly, resulting in short-circuit touch part deformation and poor touch. At this moment, no more heat is released, so the voltage tends to be stable and the temperature of the battery only rises slightly.
Energy density of lithium iron phosphate battery:
Component energy density is an important indicator of battery function. After 20 Ah lithium iron phosphate battery is fully charged, it is discharged from 0.3c to 2.0v at a multiple rate. The energy released by the battery can be obtained by integrating the discharge curve. After integral calculation, the lithium iron phosphate battery of 20 Ah emits 70.7 Wh of energy, while the battery component is 580 g, so the component energy density of lithium iron phosphate battery can be calculated to be 121.90 Wh/kg.
Discharge of lithium iron phosphate battery at different temperatures:
Due to the large regional differences in the use of electric vehicles, there is a lower temperature in the northern winter weather conditions, and the lower temperature is bound to have a certain impact on the function of the battery. Therefore, in order to understand the lithium iron phosphate battery discharge function at low temperature, test of 20 Ah lithium iron phosphate power battery in - 20 ℃, respectively - 10 ℃ and 0 ℃, 25 ℃ and 55 ℃ under the deposite 20 h, then in the low temperature environment to 0.3 c discharge (in normal temperature 0 to 3 c discharge capacity of 100%).
Lithium iron phosphate batteries can only be released under a 20 ℃ in room temperature about 55% capacity, therefore it can occur in use for electric cars. But actually very clear about the single battery with temperature decrease discharge capacity is more, and about electric vehicles, generally for hundreds of batteries together, surely will release heat when battery operation, the temperature of the battery at the moment is bound to rise, and thus for actual use of the battery pack, low temperature discharge problem is not very serious. During the test, because the specific surface area of a single battery is large, the temperature in the whole test process is basically the same as the environment, so the discharge capacity is greatly affected.
Under the high temperature lithium iron phosphate battery less affected, such as relative 25 ℃ at 55 ℃ battery discharge capacity only slightly to add.
Indicated after the above discussion, the lithium iron phosphate battery has long cycle life, high safety Sui because lithium iron phosphate battery with energy density in the whole production process does not use lead, cadmium, mercury, hexavalent chromium toxic heavy metal elements such as materials, battery packaging materials do not contain polybrominated biphenyls (PCBS) and polybrominated diphenyl ether, lithium iron phosphate batteries are also more environmentally friendly. Therefore, lithium iron phosphate battery in electric vehicles and large-scale chemical energy storage category will have a broader use.
Lithium iron phosphate battery these advantages you like which one? Like me, I prefer the safety of lithium iron phosphate battery, but the battery is safe, so I can rest assured when using it. Check out the site map to learn more about what you like about lithium iron phosphate batteries.
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