First, the 21700 battery entered the standard catalog of power battery systems; immediately, BAIC and Nanjing Jinlong equipped Tianjin Lishen's 21700 battery electric logistics vehicle into the 299 batch catalog. This means that the 21700 battery is no longer in the fog, but has mature applications and is recognized.
Compared with the 18650 battery, the 21700 battery has made a lot of progress in terms of cost, energy density and light weight, and it is likely to become the trend of the next cylindrical battery, so it has been sought after by everyone. However, the 21700 battery application market has not yet fully opened, and the remarks about the advantage of the 26650 battery over the 21700 battery have begun to spread.
Recently, Xiaobo, the sales director of Jiangxi Hualiyuan Lithium Energy Technology Co., Ltd., mentioned in a forum: "21700 is only a starting point. The larger specification of 26650 cylindrical battery is the mainstream of the Chinese market in the future." According to its introduction, Huali The source of the 26650 is more advantageous than the 21700 in terms of weight and cost.
It is reported that Hualiyuan 26650 battery price is only 0.8 yuan / wh, while the same system 18650 battery price is 1.0 yuan / wh, the decline rate reached 20%. Compared with the 21700 battery's 5%-10% drop in the 18650 battery, it does have a price advantage. Even after the PACK is grouped, the price is only 1.2 yuan / wh.
In fact, the 26650 battery has received attention, dating back to 6 years. In June 2011, Qianjiang Motorcycle announced that it would spend no more than 80 million yuan to develop lithium batteries in cooperation with K2. The two parties jointly developed and manufactured lithium iron phosphate battery projects, including 18650 and 26650 cylindrical power batteries. The project began mass production in 2015 and sold in small quantities.
In the lithium battery industry, according to the "Automobile Power Battery Industry Standard Conditions" issued by the Ministry of Industry and Information Technology in October 2015, the company and its catalogue (the first batch), the Water Heater 32650 lithium iron phosphate battery and the 26650 ternary battery Successfully selected the first batch of product catalogs.
It can be said that the 26650 battery is similar to the fate of the 21700 battery. Although it has been in the industry for a long time, it has been completely covered by the 18650 battery in the market. The fate of the 21700 battery was slightly better. It met the Tesla president Musk and shouted for it, and the 26650 battery obviously lacked such an opportunity.
But in fact, the physical size of the cylindrical cell increases not only the energy density, but also the cycle life and rate. According to estimates, for every 10% increase in capacity, the cycle life is reduced by about 20%; the charge and discharge rate is reduced by 30 to 40%; and the cell will have a temperature rise of about 20%. If you continue to increase the size, it will increase the risk of battery safety.
Therefore, the lower security and adaptability lead to the failure of the 21700 and larger cylinders such as the 26650 and 32650 batteries to occupy the mainstream market. However, Hua Liyuan said that the company has been able to achieve a temperature rise of less than 10 ° C, in the 3 C discharge rate, the temperature rise is controlled within a safe range.
At a time when the industry is in urgent need of cost reduction, there is a new and reliable way to reduce costs, which will naturally be favored by power battery companies and new energy vehicles. However, like the 21700 battery, it needs to be verified by the market for a long time. The same 26650 is really so beautiful, after the market test, we will know the answer.
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