今天因為要秀東西給朋友看 一拿在手上 怪怪 怎麼底部彎彎的
翻開底部一看 挖~~~~
底下的電池居然變身了
這禮拜天將會送這台去水果店(幸好當初有買apple care)
不過當這種問題發生 既使過保apple也要換一顆新的吧?
P.S:有點想要直接去買顆新電池 然後把這顆電池保留下來 因為我從沒見過這樣的狀況
有影片有真相
http://s89.photobucket.com/albums/k205/ ... 2297_2.flv
版主: Alex Tsai、ross_tt、bryanchang、digdog
我今天拿著電池跑去soho區的apple store 一個金髮妹妹看到我的電池後evenwu 寫:我的也是這樣
結果拿去優仕,答案是不能換的~
看來是因為設計或是製造問題,造成電池被充過頭,結果就是電池裡面的鯉離子結晶膨脹而造成損壞的現象。The problem has to do with the chemistry of lithium ion batteries, which reacts unfavorably to overcharging.
“There are strict limits on how much current can be put through a lithium-ion cell,” explains Sadoway. “During normal charging, you never see metallic lithium, which is inherently unstable. But during overcharging, the lithium builds up faster than it can dissipate. The result is that metallic lithium plates up on the anode. At the same time, the cathode becomes an oxidizing agent and loses stability.”
The big danger, says Sadoway, is that this chemical reaction is accompanied by heat and-- as every engineer knows -- warm gas occupies more space, which is what causes the battery to swell.
The bulging battery is now, in essence, a ticking time bomb.
As a safeguard, today’s battery engineers normally design in internal charging circuits, using charger ICs and vendor-supplied reference designs. Rather than controlling the charging directly, these internal battery pack circuits prevent an overcharge. And if they detect a limit, they shut down the battery.
Design of these circuits can be tricky, as consumers can accidentally connect the wrong power adaptor to a device. So engineers need to plan for almost any contingency.
And if they’ve been designing for nickel-metal-hydride batteries in the past, they need to throw the existing charger out as it will be incompatible with the new design. Apple learned that lesson the hard way in the early 1990s with a laptop that was designed for use with either a nickel-metal-hydride or lithium-ion battery. To save space, Sony (the battery maker) put the charging protocols on the motherboard and supplied a single charger.
Problem was nickel-metal-hydride charges at a much higher rate than lithium-ion. Ouch.