Frontier Aspects: BMW's research on batteries and battery materials

by:CTECHi     2021-08-14

Lithium Grid News: Recently, the share prices of Tesla and BYD have fluctuated somewhat. All the way down, Tesla has fallen by 100 dollars, and BYD has also fallen by 10 dollars. As new energy vehicles enter the second half, everyone's eyes are on the technological development of batteries. The patience of the country is limited, and the patience of investors is limited. Live a good life now, without a breakthrough in the battery level, the current boom is like a mirror.

Talking about business, a while ago, BMW announced that it would invest 200 million euros to establish a battery cell Ru0026D center in Munich, and begin to get involved in cell-level technology verification and development. This Ru0026D center will have 200 engineers and will be in Opened in the spring of 2019.

This time is also based on a material from earlier in 2017. Let’s take a look at BMW’s research on future battery materials and power batteries. With Dr. Peter Lamp’s lecture materials and some informative releases in various places.

Look at the conclusion first. The most important thing is energy density u0026 cost. Every link must be improved and optimized

As we go deeper, the Pack-level technology has become a small piece

The core challenge of battery cell design is to ensure that the safety level of EUCAR Level remains unchanged. The compromise of density, fast charging speed and cost can partly sacrifice the number of cycles (future cell design does not need to emphasize this number blindly).

In the short term, energy density and cost are more important. In the long run, the charging speed becomes more and more important under the conditions of determining the priority of the two.

The strategy to increase energy density is to leap on the electrolyte to find a way, and the other is the traditional evolution route

Remarks: From the current radical battery energy density requirements, The former takes too long, and the latter has a great risk in the process of commercialization

As the energy density increases, the number of cycles may be worse, and we all need to divide Electrolyte stability, active material stability, and gas production in the reaction are evaluated. The basic parameters may not be enough by experimentation. In the future, we need to communicate with Johnny Duo

Cathode material technology route: According to BMW’s view, NMC’s u200bu200broute looks reliable. Other research fields may be very hot, but it may not be possible.

Ni-rich NMC Existing problems: cycle life, characteristics and safety

The following is the beginning of the Amway carbon nanotube silicon composite anode and cathode NCM

Electrode design

The research and development center will conduct research on the different chemical components of the battery cell to verify that the Below are the performance of these batteries, the difference between slow charging and fast charging, the size and volume of the battery, and so on. Previously, BMW put a lot of testing in the third-party TUV laboratory, but this time it basically took the research and development of battery cells back to the company.

Picture BMW Battery Ru0026D Center

BMW’s battery Ru0026D is different from the traditional ones that rely on university research, battery cell suppliers, and material suppliers. Instead, the design, development and verification of the cell level can be completed independently and quickly. Rely on high-end researchers to do some IP, thoroughly understand the design and process differences at the cell level, and configure some trial-produced cell capabilities. There is also a cooperation with Solid Power in the front-end development of solid-state batteries.

Research on graph batteries

Summary: Future research depends on the roadmap of the actual product. reference.

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