Fast charging lithium battery attracts industry attention

In the new energy automotive industry, technical issues such as difficulty charging and long charging times have been one of the roadblocks for the promotion of electric vehicles. In the case where the charging facility cannot fully satisfy the demand, the core problem of all this is that the charging technology of the electric vehicle is not sufficient to meet the requirement of quick charging. The power car that can meet the fast charging becomes the explicit demand of the industry.

However, new market demand will inevitably lead to new technological innovations and product emergence.

“The second-generation fast-charging Lithium Battery we released this time can shorten the charging time to 15 minutes.” At the 3rd China (Shenzhen) Bus Urban Development Forum in 2013, Zheng Zhuoqun, Director of the Technical Center of Micro-Power Systems Co., Ltd. introduced In the current situation that the universal charging technology of new energy vehicles cannot satisfy the fast charge, the industry needs to make changes.

Advanced power battery technology According to general manager of Micro-Power (Huzhou) Co., Ltd. Comrade Zhi Ming, micro-powered first-generation fast rechargeable battery products - LpTO? lithium titanate battery has more than 900 buses have been cumulative operation of more than 60 million kilometers, while the second-generation product released this time still maintains the characteristics of fast charging capacity and over 10,000 long cycle life, its energy density and economic efficiency have been significantly improved over the previous generation of products. The operation of pure electric buses provides a better energy solution.

"Multiple lithium battery cells have more than 10,000 cycles at room temperature at 6C rate, which is twice that of the best lithium iron phosphate battery in the world. After grouping, it can meet 4C charge rate, which means The battery pack can be fully charged within 15 minutes.” Zheng Zhuoqun introduced, the weight energy density of multiple lithium batteries also reached 120Wh/kg, more than lithium titanate and lithium iron phosphate batteries. The discharge capacity of the multiple lithium battery at low temperatures (minus 20 degrees Celsius) can reach 78% at normal temperature, and it has good low temperature performance.

The introduction of multiple-combined lithium battery products compensates for the shortcomings of fast energy-filled lithium titanate batteries with low energy density and the shortcomings of energy-type lithium iron phosphate and triple battery, and provides a real demand for pure electric vehicle products to truly achieve bus operations. Innovative, more feasible and more economical solutions.

"The improvement of product performance is based on the research and development of basic raw materials." Comrade Gao Ming told "High-tech Li-ion Battery," a multiple-composite lithium battery adopts micro-macro-patented porous composite carbon as the negative electrode material. Its greatest feature lies in its revolutionary achievement of specific surface area. More than 20 times that of conventional graphite, the increased specific surface area and pores also greatly increase the number of lithium ion migration and the number of embedded channels, enabling lithium ions to be rapidly and stably embedded and extracted. This solves the technical bottleneck that has long hindered rapid charging of high energy density graphite negative electrode lithium battery products, and at the same time greatly extended battery life.

This technology also makes the battery safety significantly higher than the traditional graphite anode lithium battery, multi-component lithium battery group has passed the mandatory inspection of the National Bus Quality Supervision and Inspection Center. 9 safety tests, including short circuit, overcharge, overdischarge, heavy object impact, drop, squeeze, acupuncture, high-level simulation, heating, etc., are in full compliance with the national QC/T 743-2006 "Electrical Vehicles Lithium-ion battery" safety standard.

The characteristics of fast charging "Charging slowly and taking a long time are the common problems encountered by most electric cars still in operation." Tong Zhiming believes that the biggest difference between Weihong and other power battery companies is that they deeply understand bus users' solutions to pure electric bus technology. The bottleneck, the need to improve operational efficiency, and the use of their own development capabilities in the field of basic materials chemistry, actively seeking for more feasible solutions for frontline bus users.

Different from the lithium iron phosphate pure electric vehicle, it is necessary to equip the battery required for the entire day and the lithium titanate pure electric vehicle requires frequent station charging. The use of multi-component lithium batteries requires only half a day to operate the required batteries. After the morning of the operation, fast-replenishment can be completed in 15 minutes at noon to satisfy full day operations.

The new generation of multi-component lithium batteries has a higher energy density, which makes the vehicle's driving mileage longer, while the battery weight loss reaches 40%.

The traditional lithium iron phosphate battery pack cannot be quickly charged because the passenger car needs to be equipped with the batteries required for full-day operation. The vehicle-mounted battery pack weighs more than 4 tons; while the multi-cell compound lithium battery technology that can be quickly charged only requires a vehicle-mounted half-day battery. The weight can be reduced by 40% compared with the lithium iron phosphate solution, which significantly reduces the structural load and energy consumption of the vehicle body, improves the safety, and increases the passenger carrying capacity. Fast charge, high efficiency, and long cycle life. "The same fast charge effect no longer requires frequent return charge. All-day operation requires only a quick 15 minute charge at midday break; return to the station in the evening. You can choose to fast charge or use the power grid slow electric slow charge." Comrade Zhiming believes that multiple batteries, long life, less investment in vehicles and charging facilities, can achieve high efficiency operation and maximize economic efficiency.

As an active implementer of the rapid charge technology, micro-macro power system since the beginning of 2011, micro-macro launched the first generation of fast-charging batteries, rapid charging vehicles have launched a large-scale field operations at home and abroad. As of September 2013, Weihong's fast-charging battery system products have been equipped with more than 900 buses and buses, achieving nearly 60 million kilometers of actual operational accumulation.

It is understood that the fast charging station set up at the Chongqing Airport Bus Terminal can be used to quickly charge six pure electric fast-charging buses. The battery pack can be fully charged in 6-8 minutes; more than two years of field operations are fast. The accumulated experience of charging technology, especially in the field of public transportation, has also been recognized by bus customers.

On September 17, a new round of subsidy policies for new energy vehicles has been announced. One of the important new policies in the New Deal requires that the proportion of new energy vehicles that promote urban foreign companies be no less than 30%. This provides a breakthrough opportunity for technology-based companies such as Micro Acer.

"The release of the second-generation fast-charging lithium battery marks another breakthrough in micro-macro technology. The higher energy density, fast charging, and long cycle life make the current bottleneck of electric vehicles a breakthrough. We will very much look forward to this new product being able to speed up the process of traffic electrification.” For the future planning, Comrade Ming said that the turning point of technology leading the market has begun to highlight, and now we can see who can hold it.