NiMH No.7 battery

　　Where will the future NiMH No.7 battery technology route go?

　　1. What is NCM811 ternary lithium NiMH No.7 battery?

　　This may be a very boring technology sharing article, but at this time before the subsidy is withdrawn, it may change the direction of the next new energy market. NiMH No.7 battery is one of the technical routes most closely related to new energy vehicles. Regardless of the manufacturing cost of the entire vehicle or the actual product life, energy consumption and lightweight, the choice of NiMH No.7 battery technology route is very important for a car company. Extremely critical.

　　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 termed "... 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 NiMH No.7 battery that is currently hotly discussed in the industry on the NiMH No.7 battery technology route. Regarding this choice, the official also gave a multi-dimensional explanation. As well as speculations on the route of NiMH No.7 battery technology selection in the next market.

　　●What is NCM811 ternary lithium NiMH No.7 battery?

　　Lithium iron phosphate and ternary lithium batteries used in new energy vehicles are two types of NiMH No.7 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 NiMH No.7 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 NiMH No.7 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 NiMH No.7 battery core, but the most critical thing is to make the cost of the NiMH No.7 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 NiMH No.7 battery pack manufacturing (and even the possibility of malicious monopoly), which has also restricted vehicle terminals. Selling price. From the perspective of NiMH No.7 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 NiMH No.7 battery route that everyone yearns for. Is this a step that can be buried? Success equals risk and reward.

　　As strict as the NCM811 ratio is the NCA ratio currently used by Tesla Model 3, in which the cobalt content is even lower, accounting for only 0.5 (0.8:1.5:0.5). The choice of technical routes between NCM811 and NCA has also been one of the most discussed topics in the industry in the past year. However, the latter has more difficult production process requirements and transformation of the production line. NCM811 has become a short-term choice. The most promising direction is inside. However, judging from the current expiration period of China’s new energy subsidy policy, changes in cobalt prices after 2020 will truly determine which of the two cutting-edge NiMH No.7 battery technologies will be adopted more.

　　After entering 2019, judging from the research and development plans of many domestic NiMH No.7 battery companies, NCM811 has been officially put on the plan. At this technical communication meeting of Hezhong Automobile, it was also mentioned that the Hezhong U, which will be launched at the end of this year, will use the NCM811 ternary lithium NiMH No.7 battery supplied by CATL, becoming the first batch of NCM811 batteries in the current market. One of the new energy vehicle companies.

　　But for car companies, facing the advancement of NCM811 NiMH No.7 battery technology route, it is obviously not feasible to just rely on NiMH No.7 battery manufacturers. Whether they have done a good job in technical evaluation of mass-produced models, and whether they have done a good job in electronic control systems and safety strategies With sufficient preparation, choosing NCM811 batteries with equal risks and returns is definitely not a "use-it-all" idea.

　　2. Only “security” cannot be compromised

　　●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 of mass production application of NCM811 batteries? In fact, the most critical thing is how to control safety issues under high nickel (Ni) ratio. This is also the reason 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 the key product reliability applied in 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 NiMH No.7 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 NiMH No.7 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 NiMH No.7 battery system management have been left to NiMH No.7 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 NiMH No.7 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 NiMH No.7 battery systems", NCM811 batteries are also a technology development trend.

　　Deng Xiaoguang mentioned that for new energy vehicles, NiMH No.7 battery energy density and vehicle energy consumption are always the direction of technical efforts. The sooner we prepare for the NCM811 technical route, the sooner we can platform the NiMH No.7 battery pack system. The safety and stability issues involved will also be polished on product consistency with suppliers, and management strategies will be formulated on the NiMH No.7 battery control system for the discharge characteristics of NCM811, such as increasing the control of charging rate and implementing a ladder charging strategy. .

　　In addition, he also mentioned that in order to meet the energy density and lightweight of the NiMH No.7 battery system, the NCM811 NiMH No.7 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 NiMH No.7 battery pack is Reaching 180wh/kg also allows its comprehensive cruising range to exceed 500km. This NiMH No.7 battery life result is inseparable from the help of NCM811 NiMH No.7 battery, and there is even more room for improvement in the next few years.

　　●Disappearance of subsidies and changes in NiMH No.7 battery technology route

　　2019 is the last year for new energy vehicles to receive state subsidies. In the first half of the year, many companies have made it clear that they are fully prepared to give up subsidies during product development and use the hard power of their products to change the market. Therefore, in this technology sharing meeting of Hezhong Automobile, although the official also mentioned that the smart cockpit concept and the technical route setting of autonomous driving are also the main selling points of its next products, but in my opinion, in terms of NCM811 NiMH No.7 battery In terms of selection, Hezhong is one step ahead of the market. There are risks but there are rewards.

　　The choice of NiMH No.7 battery route has always been strongly related to government subsidies. The abandonment of lithium iron phosphate and the choice of 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 NiMH No.7 battery technology route to continue to shift towards low energy consumption and high density. But everything has two sides. There are also rumors that suggest that after subsidies are completely stopped next year, car companies will return to the direction of "cost and benefit". At a time when cobalt prices remain high, now that there is no "subsidy" inducement, will you go back and choose lower-cost lithium iron phosphate batteries?

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