Dongwon Systems starts mass production of metal cans for 21700-type cylindrical batteries

By Park Sae-jin Posted : April 19, 2022, 10:52 Updated : April 19, 2022, 10:52

[Courtesy of Dongwon Systems]

SEOUL -- Dongwon Systems, the packaging solution developer wing of South Korea's Dongwon Group, has started the mass production of metal can-shaped casings for 21700-type batteries that have about 30 percent more capacity than 18650-type high-performance batteries.
While ordinary prismatic lithium-ion batteries are packaged inside flexible and soft polymer casings, cylindrical batteries are encased inside metal cans. The tube-shaped batteries have a smaller energy capacity than their polymer-encased brothers but the metal can batteries are easier to manage. When a battery pack's cell fails, the malfunctioning cylinder cell can be replaced with another one while conventional battery packs have to be replaced with another pack.
Cylindrical batteries are being popularized in the electric vehicle sector for their easy maintenance characteristics. Also, the metal can batteries can withstand high internal pressures without deforming. An ordinary lithium-ion battery would swell and explode when pressure is built inside the pack. Also, tube-shaped batteries can be produced at a much faster rate and cheaper than other prismatic batteries.
Dongwon Systems said 19 that the company has set up a manufacturing facility for 21700 cans (21mm X 70mm) for secondary batteries and started sales in March 2022. The company developed a technique to beef up the corrosion resistance capability of 21700 battery cans in January, after the company acquired battery can maker MKC in April 2021.
"We plan to upgrade our secondary battery can-making capability to prepare for increased global demands by adding more production lines," Dongwon Systems said in a statement on April 19.
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