At a recent technology sharing meeting, Hozon Motors, one of the new car brands, shared the three major technical dimensions currently covered by its products, including three-electric systems, intelligent driving, and what the official calls "... Emotional care” smart cockpit. Among them, in the sharing of the three-power system, this start-up car company boldly chose the NCM811 ternary lithium battery that is currently hotly discussed in the industry on the battery technology route. Regarding this choice, the official also gave a multi-dimensional explanation. As well as speculations on the route of battery technology selection in the next market.

　　What is NCM811 ternary lithium battery?

　　Regarding the lithium iron phosphate and ternary lithium batteries used in new energy vehicles, they are two types of battery technology routes that we have often popularized and compared in the past few years. Since 2017, the current global new energy vehicles have completely switched from lithium iron phosphate to ternary lithium. To this day, the former has almost become a loser in the technological process, and the market has been completely replaced by ternary lithium. Occupied by the battery.

　　NCM811 is one of the most cutting-edge development routes for ternary lithium batteries. NCM represents its main components nickel (Ni) cobalt (Co) manganese (Mn), while 811 represents the ratio of the three components 0.8:0.1 :0.1. Before NCM811, 523 and 622 ratios were the main ternary lithium battery production routes in the market. The core of choosing the ratio was to increase the content of nickel (Ni) and reduce the content of cobalt (Co). At a technical level, higher nickel can meet the larger discharge ratio and relative density (specific capacity) of the battery core, but the most critical thing is to make the cost of the battery core lower by continuously reducing the cobalt content.

　　In the past few years, the global price of cobalt has broken through the ceiling with the explosion of the new energy vehicle market. This has also made it difficult to reduce the cost of battery pack manufacturing (and even the possibility of malicious monopoly), which has also restricted vehicle terminals. Selling price. From the perspective of battery manufacturers to car companies, how to reduce dependence on cobalt is the key to controlling the entire cost chain. Therefore, the 811 ratio has become the ternary lithium battery route that everyone yearns for. Is this a step that can be buried? Success equals risk and reward.

　　You can compromise on everything, except "safety"

　　The advantages and disadvantages of various ratios of ternary lithium batteries are not the focus of this issue. Let’s jump directly to the core link - what are the pain points in the mass production application of NCM811 batteries? In fact, the most critical thing is how to control the high nickel ( Ni) safety issues under the ratio, which is why many car companies dare not choose NCM811 ternary lithium batteries. Considering safety is the bottom line for all car companies in the process of evaluating technology advancement.

　　Stability, thermal runaway and cycle life are three problems surrounding the historical issues of NCM811 batteries, and also directly involve key product reliability when applied to new energy vehicles. In the past, for safety reasons, car companies still tended to choose a conservative 523 or 622 ratio when choosing ternary lithium batteries. Even a few years ago, the safety risks of NCM811 batteries failed to pass the country's mandatory safety certification.

　　However, as more and more domestic battery companies and car companies invest in the research and development and testing of NCM811 batteries, their safety control has also been significantly improved in the past two years. In addition, policies have increased the energy density requirements of battery packs. As NCM811 continues to rise, it has become an unavoidable route, and it is only a matter of time before it enters the market on a large scale. Strengthening production and strengthening battery system management have been left to battery manufacturers and car companies respectively.

　　The Hezhong U, which just debuted at the Shanghai Auto Show, has announced that it will use NCM811 ternary lithium batteries. At the technical communication meeting, Deng Xiaoguang, deputy director of the Hezhong Automotive Engineering Institute, also highlighted the courage to choose this battery route at this point in 2019. necessary and ensure the highest safety level standards. As all new energy vehicle companies are pursuing the issue of "lightweight battery systems", NCM811 batteries are also a technology development trend.

　　In addition, he also mentioned that in order to meet the energy density and lightweight of the battery system, the NCM811 battery can also be used with targeted PACK packaging technology to achieve "increased capacity and weight reduction". On the Hezhong U model, the energy density of its battery pack is Reaching 180wh/kg also allows its comprehensive cruising range to exceed 500km. This battery life result is inseparable from the help of NCM811 battery, and there is even more room for improvement in the next few years.

　　Disappearance of subsidies and changes in battery technology route

　　The choice of battery route has always been strongly related to government subsidies. The decision to abandon lithium iron phosphate and choose ternary lithium is also due to the subsidy requirements and transfer of energy density. In the 2019 subsidies, the increase in the threshold for vehicle energy consumption coefficient also prompted the choice of battery technology route to continue to shift towards low energy consumption and high density. But everything has two sides. There are also rumors currently suggesting that after subsidies are completely stopped next year, car companies will return to the direction of "cost and benefit". At present, when the price of cobalt remains high, since there is no inducement of "subsidy", will you go back and choose lower-cost lithium iron phosphate batteries?

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