% Another battery pack source for conversions? %
http://english.yonhapnews.co.kr/business/2015/10/04/56/0501000000AEN20151004001200320F.html LG Chem to provide batteries to Yamaha's golf carts 2015/10/04 [email protected] SEOUL, Oct. 4 (Yonhap) -- LG Chem Ltd., South Korea's leading chemicals and battery maker, said Sunday that it has signed a deal to supply lithium-ion (EV) batteries to golf carts made by Japan's Yamaha Motors Company. Under the contract, LG Chem will supply Yamaha Motors with lithium-ion batteries for its golf carts starting from later this year until 2016, the Korean company said, without disclosing a specific amount. The 5.5 kWh battery contained in a pouch is lighter and lasts longer than the lead storage battery, it said. Yamaha is a major Japanese manufacturer of motorcycles, marine products and other motorized products, taking the No. 1 spot in the golf cart market. [© yonhapnews.co.kr] http://www.koreatimes.co.kr/www/news/tech/2015/10/133_187962.html LG wins battery deal with Yamaha Motors 2015-10-04 By Kim Yoo-chul [image / Courtesy of LG Chem http://img.koreatimes.co.kr/upload/newsV2/images/151004_p10_LG.jpg Yamaha's five-seat golf cart is seen in this photo, Sunday. ] LG Chem, the world's leading supplier of car batteries, has signed a battery supplement deal with Yamaha Motors of Japan as the Korean company boosts efforts to diversify. LG will supply round, pouch-style lithium-ion battery packs for Yamaha's golf carts throughout 2016, LG Chem on Sunday. "LG Chem is the first among its chief local rivals, such as SK Innovation and Samsung SDI, to clinch the battery deal with the Japanese company," said C.S. Song, head of LG's public relations team. The 5.5 kilowatt per hour (KWh) battery is 50 percent lighter than a traditional lead storage battery, but offers double the life span, stated LG. "Without additional costs, the LG Chem battery will last for five years and charging time has been cut by 40 percent compared to existing models." Song declined to give financial details such as the value of the latest agreement. But the LG statement said Yamaha was considering expanding the use of LG Chem batteries to other products. Analysts and company officials said this would give a huge boost to LG's battery business and profits. Established in 1955, Yamaha is one of the world's leading golf-cart manufacturers ... Global demand for golf carts is estimated at about 1.5 million units. LG said it would benefit strongly from global car makers' moves to replace lead storage batteries with lithium-ion ones. LG Chem competes mainly with Samsung SDI in the car batteries sector. LG relies on pouch-style batteries, while the Samsung Group's battery unit prefers rectangular batteries. [© koreatimes.co.kr] ... http://www.koreaherald.com/view.php?ud=20151004000308 LG Chem to supply batteries for Yamaha golf carts http://batteryuniversity.com/learn/article/types_of_battery_cells BU-301a: Types of Battery Cells Compare the pros and cons of the cylindrical cell, button cell, prismatic cell and pouch [image / Courtesy of Cadex http://batteryuniversity.com/_img/content/pack6(1).jpg The pouch cell http://batteryuniversity.com/_img/content/pack7(1).jpg Swelling pouch cell ] ... Even though the cylindrical cell does not fully utilize the space by creating air cavities on side-by-side placement, the 18650 has a higher energy density than a prismatic/pouch Li-ion cell ... Pouch Cell In 1995 the pouch cell surprised the battery world with a radical new design. Rather than using a metallic cylinder and glass-to-metal electrical feed-through, conductive foil-tabs are welded to the electrodes and brought to the outside in a fully sealed way. Figure 6 illustrates a pouch cell. Figure 6: The pouch cell The pouch cell offers a simple, flexible and lightweight solution to battery design. Exposure to high humidity and hot temperature can shorten service life. The pouch cell makes the most efficient use of space and achieves a 90–95 percent packaging efficiency, the highest among battery packs. Eliminating the metal enclosure reduces weight but the cell needs some support in the battery compartment. The pouch pack finds applications in consumer, military and automotive applications. No standardized pouch cells exist; each manufacturer designs its own. Pouch packs are commonly Li-polymer and serve well as Power Cells by delivery high current. The capacity is lower than Li-ion in the cylindrical package and the flat-cell may be less durable. Expect 8–10 percent swelling over 500 cycles and make provision in the battery compartment for expansion. It is best not to stack pouch cells on top of each other but to lay them flat side by side. Prevent sharp edges that can stress the pouch cells as they expand. Extreme swelling is a concern. Users of pouch packs have reported up to three percent swelling incidents on a poor batch run. The pressure created can crack the battery cover and in some cases break the display and electronic circuit boards. Discontinue using an inflated battery and do not puncture the bloating cell in close proximity to heat or fire. The escaping gases can ignite. Figure 7 shows a swollen pouch cell. Figure 7: Swelling pouch cell Swelling can occur as part of gas generation. Battery manufacturers are at odds why this happens. A 5mm (0.2”) battery in a hard shell can grow to 8mm (0.3”), more in a foil package. Pouch cells are manufactured by adding a temporary “gasbag” on the side. During the first charge, gases escape into the gasbag, the gasbag is cut off and the pack is resealed as part of the finishing process. Subsequent charges should no longer produce gases. Ballooning indicates that the manufacturing process may have been flawed. The prismatic and pouch cells have the potential for greater energy than the cylindrical format but the technology to produce large formats is not yet mature. The cost per kWh in the prismatic/pouch cell format is still higher than with the 18650 cell. As a comparison, the cost for the Nissan Leaf with Pouch/ Prismatic cells is $455/kWh; best practice (DoE/AABC) with this format is $350/kWh. The lowest price per kWh is the Tesla EV with the 18650 cells. Greenwich Strategy estimates the cost of the Tesla Gen III battery at $290/kWh. Summary Rechargeable batteries are either flooded with the electrodes awash in electrolyte as in the lead acid, or cylindrical as in NiCd, NiMH and Li-ion. Along came the pouch cell, a format that is similar to packaging perishable food. Intended to be cheaper to manufacture and more flexible in form factor, refinements are needed to bring this amazing cell concept to the same performance level of the cylindrical version. In summary: Cylindrical cell has superior performance, good mechanical stability and lends itself to automated manufacturing. The cell cycles well, offers a long calendar life, is low cost, but is heavy and has a low packaging density. Prismatic cell are encased in aluminum or steel for stability. Jelly-rolled or stacked, the cell is space-efficient but costlier to manufacture, less consistent in performance, harder to manage thermally and may have a shorter cycle life than the cylindrical cell. Pouch cell uses laminated architecture in a bag. It is light and cost-effective but exposure to humidity and high temperature can shorten life. A swelling factor of 8 to 10 percent over 500 cycles is normal ... [© 2015 Isidor Buchmann] For EVLN EV-newswire posts use: http://evdl.org/evln/ {brucedp.150m.com} -- View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-LG-5-5kWh-li-ion-pouch-batteries-50-lighter-2x-life-tp4677977.html Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
