On July 18, BYD procurement official wechat
account issued a recruitment announcement, to implement the public
recruitment of suppliers of large cylinder battery automatic baking line
equipment in 2023.
The product recruited by BYD is a fully
automatic contact high vacuum baking line, which is mainly used for cell
baking before liquid injection of large cylindrical batteries. The
production of the battery contains about 21 processes, and the baking
and liquid injection are in the middle of the entire production process.
The
announcement mentioned in the basic qualification requirements of
suppliers that it is preferred to be a listed company, or have the
experience of providing large cylinder battery automatic baking line
equipment supporting products for two listed companies or mainstream
enterprises in the industry in the past three years
In fact, in
the first half of this year, there were rumors that BYD was very
concerned about large cylinder batteries, and Chairman Wang Chuanfu
"personally built a work group to study large cylinder batteries."
Today's large cylinder battery production equipment procurement news is
undoubtedly BYD will soon produce large cylinder battery "solid hammer".
In
August last year, BYD announced a patent for a "six prism" battery.
From the patent diagram, the packaging form of the battery cell is
hexagonal prism, and the past is honeycomb from the top, which is
different from the mainstream square and soft pack batteries on the
market at present, and the cylindrical battery is very close.
The
patent description shows that one end of the shell 1 is open, the shape
of the shell 1 is positive polyprism, the cover body 2 is located at
the above end of the shell 1, the cover body 2 and the shell 1 jointly
define the space to accommodate, the cover body 2 is provided with a
negative terminal 22 and the height of the multiple shells between 60
and 150mm, and the diameter of the inner circle of the shell is between
15 and 60mm.
The patent also mentions: "the height of the shell
can be 90mm, and the diameter of the inner circle of the shell 1 can be
40mm", which may be the preset size of BYD's six-prism battery.
According
to the news that this battery can increase the capacity of the pole
core, and the shell can accommodate more electrolyte to extend the
service life of the pole core, and at the same time, when multiple
batteries are connected to the battery module, it effectively improves
the utilization of external space to avoid short circuit or break of the
battery.
Industry insiders speculate that BYD's battery cell is
based on a large cylindrical battery shell transformation, and will use
lithium iron phosphate chemical system.
