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What is special about BYD blade batteries
To say what is the hottest topic in the new energy circle now, it must be the blade battery. BYD's blade battery conference has made its popularity comparable to Tesla. BYD's blade battery "ends the safety pain point of new energy vehicles", "forces the new energy vehicle industry to make changes", and "ternary batteries cannot pass the acupuncture test.
So where is this "blade battery" sacred, is it as good as BYD said? To answer this question, we probably have to start with the most fundamental dispute between "ternary lithium" and "lithium iron phosphate".
As an industry pioneer, BYD was one of the first companies to start playing pure electric models. The story of this was mentioned in Tang DM's review article. Initially, BYD used lithium iron phosphate, which has a deep accumulation in this type of cell technology, but this does not mean that BYD does not have models equipped with ternary lithium batteries. The reason is to mention the controversial new energy source. subsidy policy.
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The new energy subsidy policy can be said to only look at two indicators, one is the comprehensive cruising range, and the other is the battery energy density.
Energy densities between 90-120 Wh/Kg and energy densities greater than 120 Wh/Kg are vastly different subsidies. Because of this near-close bonus, many companies have been unable to think about which battery is better overall, but have chosen ternary lithium batteries with higher energy density that are easier to achieve. Even BYD I am no exception.
So BYD's press conference this time can be said to be so angry that it even beats itself. It's so confident that it feels like it's ready. The news of frequent electric vehicle fires and spontaneous combustion bombards the fragile nerves of consumers, especially many consumers need to charge for a long time in relatively closed underground garages and other scenarios. "Equal trend.
"Blade" refers to the external shape of the battery, and the chemical form is still lithium iron phosphate. The most prominent feature is safety. It can prevent smoke and fire in the puncture experiment, and the surface temperature of the battery can be controlled below 60 degrees, let alone Burns and scalds can be avoided.
In contrast, the ternary lithium battery generally catches fire or even explodes in the puncture experiment; the traditional bulk lithium iron phosphate will also emit smoke, but there is no open flame in the initial stage. This improvement is likely related to the newly designed "blade" form having a larger heat dissipation area and longer loops during short circuits.
Ternary lithium and lithium iron phosphate are the two most common power battery solutions, and there are always debates about which one is better. In fact, they each have their own application scenarios, and there is no need to distinguish between them.
In addition to safety, the biggest advantage of lithium iron phosphate is that it is cheap and easy to obtain, and there is no need to rely on imported raw materials. At the same time, two disadvantages are also very prominent. One is energy density. BYD's lithium iron phosphate is already the best. , close to the theoretical maximum value, but it is only about 150 Wh/Kg, and ternary lithium (NCA\NCM) can reach a near-mass production state of 300 Wh/Kg; second, at temperatures below minus ten degrees, there will be Close to 50% energy decay and affect cycle life.
The high ternary lithium can not be completely said to be a policy reason. Its theoretical maximum energy density can exceed 500 Wh/Kg. In addition, its low temperature performance is much better, below minus ten degrees, and the attenuation is generally less than 20%. Disadvantages It is also very prominent. The positive electrode material is unstable at about 200 degrees Celsius, so the high temperature stability is very poor; the biggest disadvantage is not the lack of safety, but the one element "cobalt" in the "ternary" is a rare metal. need to rely on imports. So on the whole, ternary lithium is suitable for use in high-performance, high-demand luxury cars.
I believe that everyone here has a general understanding of the current battery battle. However, the current situation does not really represent the long-term future. Technology has been advancing, whether lithium iron phosphate can play new tricks, whether ternary lithium can overcome shortcomings, and whether the research on graphene, solid-state batteries, etc. can achieve breakthroughs deserve our constant attention.
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