鋰電的差,放,保養及使用

有見鋰電係RC界愈黎愈受歡迎, 可惜坊間對鋰電既使用及保養方面, 並無清晰既指引, 因為唔正確使用鋰電會引黎嚴重後果, 輕則電毀, 重則會有財物, 人命傷亡, 因為鋰電一旦燃燒, 溫度可高達1000'c, 並唔可以講笑.所以係度希望可以令大家了解多一點關於鋰電既問題.

依家係市面流通既鋰電, 人人都叫Li-po, 其實就係 Lithium-polymer , 鋰聚合物電池, 屬於第二代
鋰電池, 相比起第一代鋰電, 即係Lithium-ion, 鋰離子電池, 無論係放電輸出, 容量同工作溫度上,
都有長足既改善. 由於物理原故, 鋰電對電壓, 溫度都非常敏感, 我將會以差, 放, 使用,保養四方面
再討論.

差電 : 緊記, 每粒/片/鋰電池, 電壓上限係4.235v, 通常市面既鋰電差機大約每cell 4.2v就會cut ,
如果有得set, 4.1v就好停, 因為電壓一過臨界值, 鋰電入面既電解質就會分解, 此為對電池不可逆轉既破壞, 導致電池容量,電壓減少. 如果繼續為電池充電, 鋰離子會在電池內layer層
積蓄, 型成Lithium Plating, , 引至內部短路, 跟著係有大量氣體放出, 因為氣體並無氧份, 所以
電池會彭漲, 直至保護層爆裂, 空氣進入, 之後就係可怕既燃燒.....
所以見到鋰電有漲既績像, 為自身安全著想, 唔好再用喇.
至於差電既電流, 電上面通常都會印有recommand current, 通常都建議2A, 不過好多人都唔理,
用5A去差, 基本上問題唔大, 不過要留意唔好俾排電既溫度過45'c就ok
新電的話最好用2A差開頭果幾次, 等排電適應下先.

放電 : 鋰電因為無電池記憶特性, 所以係唔需要放電, 而且鋰電漏電情況大約每月只係
電池儲存量既5-10% , 相比Ni-mh 既30%, 可謂相當優秀.  但緊記電壓要保持係2.8v以上,
但因為每間電池廠標准盡不相同, 所以我會建議3.0-3.2v比較保險. 因為電池電壓過低
亦會對電池內化學物質做成破壞, 減少電壓同儲電量. 好多差機都有storage mode,
可以放心使用.

保養 : 其實保養好簡單, 每次充電前, 留意電池有無破損, 彭漲, 差電線有無損壞, 正負極
唔好攪錯等. 差電時, 儲藏時都一定要用Li-po sack , 因為一旦起火, 佢真係救到你.

使用 : 上面提過鋰電應用電壓大約由4.2v至3v, 如果閣下既ESC有 Li-po cut , 可以set到 3.2v - 3.4v
cut 電, 如果無Li-po cut 既功能, 可以用外置既 device, 不過, 其實鋰電既放電(輸出)效率係好高,
基本上由4.2v開始至大約3.6v, 都接近成一水平線, 換句話說, 即係電壓係呢個range, 都有相近
表現(爆炸力). 當你覺得架車開始林林地, 即係話電壓可能已經低過3.6v, 要停喇.

另外, 鋰電既最佳工作溫度範圍大約係20'c - 55'c, 過熱會令鋰電池造成永久性容量, 電壓上
既破壞. 所以玩油車就唔好用鋰電黎做接收電.

以上既資料係我係外國網站睇完再自行總結, 如有錯漏歡迎指正.

加返少少...
保養 > 唔好差滿黎存放, 差到大概3.8V -4.0V /CELL 就OK, 每隔一個月拎出黎CHECK 下。

非常有用. thank you so much. .

有見鋰電係RC界愈黎愈受歡迎, 可惜坊間對鋰電既使用及保養方面, 並無清晰既指引, 因為唔正確使用鋰電會引黎嚴重後果, 輕則電毀, 重則會有財物, 人命傷亡, 因為鋰電一旦燃燒, 溫度可高達1000'c, 並唔可以講笑.所以係度 ...
kc001 發表於 2009-6-8 19:17

                               
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如果見到鋰電有漲既績像,應該點樣處置呢?

thks for your sharing

4# ERICVIVI


係外國網站, 有人提過將舊鋰電用Light Bulb放電至1v, 用鹽水浸佢兩個星期, 就可以當普通垃圾處理.
唔知堅唔堅, 但係我知依家有d寫字樓同屋苑, 都有鋰電回收箱, 大家可以搵搵.

thanks for the information!

這個post 文章kcoo1 兄 解釋了好多鋰電問題. 若內容真確. 版主不如考慮下  highlight 及置頂. 等多0的版友看到.

4# ERICVIVI


係外國網站, 有人提過將舊鋰電用Light Bulb放電至1v, 用鹽水浸佢兩個星期, 就可以當普通垃圾處理.
唔知堅唔堅, 但係我知依家有d寫字樓同屋苑, 都有鋰電回收箱, 大家可以搵搵.
kc001 發表於 2009-6-8 21:04

                               
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Thanks.

好長細!!感謝!!

very good!
thx

好有用~~thanks~~

Dear RC fans and lipo user, pls also see this :

http://bbs.rc-evo.com/viewthread ... &extra=page%3D1

don't go away if u are charging it !!

找到個pdf 教點去處理 沒用的lipo.  

** DISPOSAL OF LIPO BATTERIES **
Unlike NiCd batteries, lithium-polymer batteries are environmentally friendly.
For safety reasons, it’s best that LiPo cells be fully discharged before disposal (however,
if physically damaged it is NOT recommended to discharge LiPo cells before disposal -
see below for details). The batteries must also be cool before proceeding with disposal
instructions. To dispose of LiPo cells and packs:
1. If any LiPo cell in the pack has been physically damaged, resulting
in a swollen cell or a split or tear in a cell’s foil covering, do NOT discharge the battery.
Jump to step 5.
2. Place the LiPo battery in a fireproof container or bucket of sand.
3. Connect the battery to a LiPo discharger. Set the discharge cutoff
voltage to the
lowest possible value. Set the discharge current to a C/10 value, with “C” being the
capacity rating of the pack. For example, the “1C” rating for a 1200mAh battery is 1.2A,
and that battery’s C/10 current value is (1.2A / 10) can be used,
such as a power resistor or set of light bulbs as long as the discharge current doesn’t
exceed the C/10 value and cause an overheating condition.
For LiPo packs rated at 7.4V and 11.1V , connect a 150 ohm resistor with a power rating
of 2 watts (commonly found at Radio Shack)to the pack’s positive and negative terminals
to safely discharge connecting it to an ESC/ motor system and allowing the motor to run
indefinitely until no power remains to further cause the system to function.
4. Discharge the battery until its voltage reaches 1.0V per cell or
lower. For resistive load type discharges, discharge the battery for up to 24 hours.
5. Submerse the battery into bucket or tub of salt water. This container should have a lid,
but it should not need to be air-tight. Prepare a plastic container (do not use metal) of cold
water. And mix in 1/2 cup of salt per gallon of water. Drop the battery into the salt water.
Allow the battery to remain in the tub of salt water for at least 2 weeks.
6. Remove the LiPo battery from the salt water, wrap it in newspaper or paper towels and
place it in the normal trash. They are landfill safe.

From post #1 "所以我會建議3.0-3.2v比較保險"

Better keep it at 3.7v per cell for storage. Most charger storage mode is 3.7v also.

If your charger do not have storage mode, charge it back with 1000-1500mah, on a 4000mah battery for example, should be safe.

找到個pdf 教點去處理 沒用的lipo.  

** DISPOSAL OF LIPO BATTERIES **
Unlike NiCd batteries, lithium-polymer batteries are environmentally friendly.
For safety reasons, it’s best that LiPo cells b ...
pskyng 發表於 2009-6-9 16:13

                               
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係 TeamTrinity既網站都有相同既廢置鋰電方法, 我諗應該信得過.

nice post man!!!1

好有用~thx師兄

8# pskyng


Agree! very useful for new player like me! Thks Ching for such information!!!

THANKS FOR SHARING!!