Re: [情報] 三星Note 7為何爆炸?真相揭秘:設計太激
※ 引述《Lsamia (samia)》之銘言:
: 原文是在這邊
: https://goo.gl/3vxg0v
: Aggressive design caused Samsung Galaxy Note 7 battery explosions
: http://news.sina.com.tw/article/20161205/19651634.html
: 心得:
: 不過這個看起來也不知道大家是不是都會採用同樣的規範
: 間距要預留到0.5mm以上,但要說被擠到出意外那可能要干涉到挺多的
: 這樣子要過落摔這些劇烈震盪的測試應該就比較會容易先出問題?
: 之前好像還沒有人嘗試過把手機摔到爆的測試來看看
: 可能最後還是要看三叔自己要怎麼來說明問題惹
: 或者也多拆幾家看看大家是不是都這麼嚴謹採用這個規範
原文的意思根本不是這樣 也根本不是摔到的結果
當然我們也不知道Instrumental的分析對不對 但絕對不是這篇心得寫的這樣
重點是這段Footnote:
When batteries are charged and discharged, chemical processes cause the
lithium to migrate and the battery will mechanically swell. Any battery
engineer will tell you that it’s necessary to leave some percentage of
ceiling above the battery, 10% is a rough rule-of-thumb, and over time the
battery will expand into that space. Our two-month old unit had no ceiling:
the battery and adhesive was 5.2 mm thick, resting in a 5.2 mm deep pocket.
There should have been a 0.5 mm ceiling. This is what mechanical engineers
call line-to-line -- and since it breaks such a basic rule, it must have been
intentional. It is even possible that our unit was under pressure when we
opened it.
一般來說 電池充放電反應會導致鋰離子的移動 電池會自己逐漸膨脹
電池工程師們會告訴你 一般來說他們會抓10%餘裕空間給電池合理膨脹變大保持安全
Instrumental的工程師手上拿到的兩個月舊的Note 7 電池總計大概是5.2mm厚,
裝在一個5.2mm的電池壁裡面 一般來說 應該要有個0.5mm的餘裕
但是在我們拿到的Note 7裡面是完全裝滿的 違反了這個設計常規肯定是刻意的
有個可能性是 在我們打開Note 7之前 他就已經是受壓膨脹狀態
http://imgur.com/NTMb7e7
有興趣的人可以比較之前起火點是不是這邊
TL;DR: 三星為了拚空間沒有給電池合理的空間餘裕
因此電極本身就處於一個受壓狀態 受壓一段時間後電極就絕緣破壞燒起來了
外部受力是加速這過程 但是根本因素是聰明反被聰明誤的機構設計
--
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※ 編輯: kira925 (133.51.101.148), 12/05/2016 12:28:16
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※ 編輯: kira925 (133.51.101.148), 12/05/2016 12:36:05
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※ 編輯: kira925 (133.51.101.148), 12/05/2016 13:13:45
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