News on March 29, in response to the previously controversial "blade battery" topic, Wang Chuanfu, chairman and president of BYD Group, responded today at the "Super Launch Conference" of Shenzhen TV. Wang Chuanfu said that BYD blade batteries have entered the mass production stage, and blade batteries will change the industry's dependence on ternary batteries, and even the word "self-ignition" can be completely erased from the dictionary of new energy vehicles.
As early as January of this year, Wang Chuanfu disclosed in public that "the blade battery developed by BYD-lithium iron phosphate battery products, will be mass-produced for the first time in March this year at the Chongqing plant, with a range of 600 kilometers." The market was in an uproar. At the same time, BYD's stock price soared, which also caused many questions.
Where is the technical content of the blade battery?
According to BYD's patent solution, the blade battery is a long-cell solution (mainly a square aluminum case), which is a flat design of the battery cell. The length of the blade battery can reach up to 2500mm, which is more than 10 times that of the traditional ordinary lithium iron phosphate battery. Can greatly improve the group efficiency of the battery. And it is not a specific size battery, but a series of batteries with different sizes based on different needs.
He Long, Vice President of BYD Group and Chairman of Fudi Battery, introduced that through the structural innovation of "blade battery", "modules" can be skipped when grouped, which greatly improves the volume utilization rate, and finally achieves more capacity in the same space. Design goals for multiple cells. Compared to traditional battery packs, the volume utilization rate of "blade batteries" has been increased by more than 50%, which means that the range can be increased by more than 50%, reaching the same level of high energy density ternary lithium batteries.
In the case that the battery length is 10 times that of ordinary lithium iron phosphate batteries, how to maintain the strength of the battery? He Long said that BYD's blade battery consists of 100 battery cells, each of which can act as a beam and has high strength. In addition, the blade battery also borrows the principle of honeycomb aluminum plate to strengthen the strength on the original basis.
For the previous market doubts, BYD blade batteries have "acupuncture penetration tests" with traces of cuts. BYD also announced related experimental videos in the program and stated that "there was no cut." "Needle penetration test" is considered to be the most stringent detection method for battery cell safety, and it can simulate the safety of the entire vehicle in the extremely dangerous situation of battery penetration.
In the video released by BYD, under the same test conditions, the ternary lithium battery experienced a dramatic temperature change at the time of acupuncture, and the surface temperature quickly exceeded 500 ° C and began to burn violently. The traditional lithium iron phosphate bulk battery has no open flame and smoke. The surface temperature reaches 200 ℃ ~ 400 ℃; the "blade battery" has no open flame and smoke after penetration, and the battery surface temperature is only about 30 ℃ -60 ℃.
So in this way, safety and high battery life are the core competitiveness of blade batteries.
Wang Chuanfu believes that in the past few years, due to the relatively low energy density, lithium iron phosphate batteries have been thrown away by new energy passenger car manufacturers in the blind pursuit of cruising mileage, compared with ternary lithium batteries with higher energy density but poor thermal stability. Behind him. Based on the advantages of lithium iron phosphate batteries, BYD has never given up re-development of its high safety, high endurance, and long life. "The advent of blade batteries will end the pain points of the industry and force the industry to develop," Wang Chuanfu bluntly stated.
BYD "Han" series will be equipped with blade batteries
At this press conference, BYD also revealed several key information. One is that BYD blade batteries have entered the mass production stage, and Chongqing Fodie Lithium Battery Company has undertaken the production task.
"Today, almost all car brands you can think of are discussing with us the cooperation plan based on blade battery technology." He Long said that all core technologies and components of BYD "Fudi" will also be extended to the entire new energy vehicle industry. Open sharing benefits the industry and consumers.
It is worth noting that BYD announced the establishment of Fudi in March this year in order to further accelerate the external sales of new energy vehicle core components. The established Fodie companies include Fodie Battery Co., Ltd., Fodie Vision Co., Ltd., Fodie Technology Co., Ltd., Fodie Power Co., Ltd., and Fodie Mould Co., Ltd. Among them, Foday Battery Co., Ltd. was registered on May 5, 2019, and its predecessor was BYD Lithium Battery Co., Ltd.
The second key message is that BYD's "Han" series will be equipped with blade batteries. It is expected to be put into production in June this year.
"Blade batteries are only used in BYD pure electric vehicles, and no other models are planned. BYD Han EV, as the flagship car of the Dynasty family, has a range of 605 kilometers under a comprehensive condition and accelerates in 3.9 seconds per 100 kilometers." Wang Chuanfu said.
Wang Chuanfu believes that the future development trend of the battery industry should have three characteristics, the first is high safety and health; the second is long battery life and long life; the third is less dependence on rare metals.
BYD insiders told Sina Finance, "BYD's use of blade batteries to defend the bottom line of safety is our original intention to make blade batteries. The high safety, long battery life, and long life characteristics of blade batteries will renew the development path of power batteries. Pull back on the right path based on safety. "
For the blade battery, Wang Chuanfu himself also gives very high expectations. He believes that the emergence of blade batteries is "correcting" and will lead the global power battery technology route back to the right path, or "completely erase the word spontaneous combustion from the dictionary of new energy vehicles."