The relationship between lithium power batteries and electric vehicles

Aug 23, 2019   Pageview:38

A few days ago, jianghuai released a new electric car iEV6S, which boasts a cruising range of 255 kilometers. Such a small car can go so far, although I know this is a theoretical value, but I see some automobile media websites have carried out a cruise mileage test on it, using 51% of electricity to run about 130 kilometers, if so calculated, the actual run of 200 kilometers should not be a problem. Some friends may ask, what technology will give electric cars more cruising range?


Media test results


The battery


This is the best solution for range. Some earlier electric cars use lithium iron phosphate batteries. The theoretical cruising range of electric cars is about 100 kilometers, which is enough to buy food for commuting. If I drive this kind of electric car to and from work, I will not be afraid enough and be ready to push the car at any time.


But to get a longer range, you have to offer more batteries, but that adds to the cost and, crucially, the weight, so the efficiency ratio isn't very high. Later, to solve this problem, a high-tech but not epoch-making product came out -- ternary material battery. Tesla, the current leader in electric cars, USES the same material, which can increase the range of an electric car without changing the number of batteries. Some people may ask why it is so amazing. Here's why.


Different battery density


Lithium iron phosphate battery has a capacity and density of 110mAh/g and 140Wh/kg, while lithium ternary battery has a capacity and density of 160mAh/g and 220Wh/kg. The data are immediately comparable. Tri-lithium battery has the advantages of high energy density and high density of vibration, but it also has the disadvantage of poor high temperature resistance. Therefore, we can often see the news of tesla's spontaneous combustion or combustion after impact before. Speaking of which, I have to say the battery technology used by jianghuai in the iEV6S. Tesla has a battery capacity of 70-90 KWH, while the iEV6S has a battery capacity of 33 KWH.


Why doesn't the battery hold half as much as tesla's?


This treatment method is mainly for the purpose of better cost control. The battery management and cooling system independently developed by jianghuai has been able to meet relevant safety standards. As long as the car is large and long enough, the battery pack can be added to reach the same level with tesla. But the cost will be too high. For example, the 85 KWH version of tesla costs about $40,000 to put the whole panel on the chassis... So for our city for the purpose of the car, it is not necessary.


And can see on the Internet other electric vehicle battery capacity, although the e6 has a terrible 100 kilowatt-hours of data, but it USES lithium iron phosphate batteries, it is sinking in the ternary material weight battery, so under the same condition it will be more electricity, if it wants to increase the range will be adding more battery pack, also will become heavier and consume more energy. Other mainstream domestic electric vehicles using ternary lithium batteries, such as chery eQ and baic EV200, are around 22 and 30 KWH respectively.


Analysis: the relationship between lithium battery power and electric vehicle range


But the "self-stability" of the lithium iron phosphate battery is the highest of any mainstream electric car battery type. Because of this, domestic electric car brands byd and roewe still insist on using lithium iron phosphate batteries. But last year byd also said publicly that it was starting to look at ternary lithium batteries.


After talking about the main reasons for the increase in cruise miles, let's move on to technologies that can assist vehicles in driving longer distances.


Kinetic energy recovery


Since batteries aren't a particularly big technological breakthrough right now, look elsewhere. Engineers found trolley lose part of kinetic energy in the braking process, if this part of the kinetic energy recovery back, for electric vehicles limited driving ability is sure to increase, then the kinetic energy recovery system is made, and applied in most of the electric vehicle, when the vehicle deceleration and braking force, generated by the friction not wasted, but the will power to recharge the battery recycling, makes the vehicle can run time longer. I asked some engineers, and they told me that this configuration would increase the range by about 10 percent.


Simply put: "recycling."


Battery management system


This management system will not directly affect the electric vehicle's range but indirectly. If you think, if you run in an electric vehicle and find that the remaining battery power is not displayed, the cooling fan in the battery box does not work, which causes the protection mode to be turned on and no longer provides electricity, and you find that the battery power is not charged when you want to charge the electric vehicle, these difficulties are mostly caused by problems in the battery management system. So a trusted battery management system is also necessary. It can help vehicles effectively detect energy, monitor the working state of the battery, ensure charging function, monitoring and recording functions.


conclusion


I don't think any number of assistive systems can make a significant difference in the range of an electric car. One could argue the graphene, nuclear power, the hydrogen can these materials are fundamentally the method to solve the problem, I also think that they can solve the fundamental problem, but as I know, there is no car seems to carry these technologies under the conditions of production, if the future energy production, the new energy car is no longer for certain range of the problem.


The page contains the contents of the machine translation.

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