公開討論鋰電C數的疑團[有數據啦]

http://www.rctech.net/forum/elec ... po-shoot-out-4.html

自己慢慢睇.

原帖由 AMAT 於 2009-2-10 01:16 發表

                               
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冇人知你點試,大家又點知點解會爆呢?

影張相又可以代表到你O既測試得正確?

係呀!!我成曰作嘢架!!
btw...唔該唔好喺你私密區討論我想你幫手畫logo件事!!呢d係咪""商業秘密""!!

原帖由 AMAT 於 2009-2-10 01:37 發表

                               
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http://www.rctech.net/forum/elec ... po-shoot-out-4.html

自己慢慢睇.

Rctech咪又係英文工房..............信佢!!

FROM SMC

Were very fortunate to have a great partnership with our Lipo manufacturer so I can ask them many questions and understand what makes a for a better Lipo.

So far I know that the materials used and the C rate will have an impact on cycle life. Our 24C packs use 60% Japanese matrials and 40% Chinese. This allows us to keep the price low on these packs. Our 25C , 28C and 40C+ packs use 80% Japanese and 20% Chinese materials. This makes the price higher but also means the packs will have maximum cycle life.

So when buying a Lipo for racing there should be 2 things to consider. One is performance and the other is cycle life.

Our manufacturer has done some cycle life testing for us and it consists of 100 consecutive cycles at 20C discharge and you then calculate the capacity drop in percentage.

Our new 40C+ cell stayed at 90% after 100 cycles. We tested a competitors cell and it was at 74%.

Here is what I would reccomend for a good test that would give the comsumers/racers the info they need to better help them choose a Lipo.

1 - C rate and capacity test to see if what the manufacturer claims is true.

2 - GFX cycle info to show the numbers and graph at 35 amps.

3 - Cycle life test to show how the packs hold up.

If a magazine wants to do these tests and need help I would gladly help them.

FROM SMC AGAIN

The cycle life test if very hard to do as our supplier does it consecutively using an expensive charger/discharger system.

C rate will have an impact on the cycle life but materials used and how they are used will have the biggest impact.

Below are screenshots of the cycle results on the cycle life test. The equipment encountered an issue and needed to be restarted after a 10 minute delay. So there was 40 cycles done in a row then 67 more cycles done after the the issue.

This is using a 40C+ as you can see cycle one the pack had 4840mAh and on cycle 66 which is actually cycle 106 the capacity is 4354 so this means it retained 89.9% of it's capacity after 106 consecutive cycles.

SMC提供O既數據CHART

SMC意見係,C數反映O既係電本身O既質素,C數越高O既電,不單止代表放電電流高,仲代表住佢O既CYCLE RATE.
C數高應該係可以代表佢係CYCLE多次後,容量仍然一定O既維持.

C數越高O既電,不單止代表放電電流高,仲代表住佢O既CYCLE RATE.
咁究竟係咪C數越高O既電,代表放電電流高先!!

原帖由 sunnychan 於 2009-2-10 01:33 發表

                               
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我記得上次係大陸放果d椰子咁大個煙花...點完火之後我仲跑得快過架3.5R

炸唔炸得晒個魚塘先 ...

原帖由 馮馮ymc 於 2009-2-10 01:49 發表

                               
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C數越高O既電,不單止代表放電電流高,仲代表住佢O既CYCLE RATE.
咁究竟係咪C數越高O既電,代表放電電流高先!!

係,C數係解放電電流指數.但係要同容量一齊計.

2800MAH 30C, 唔一定大電流過5000MAH 20C.

原帖由 sunnychan 於 2009-2-10 00:23 發表

                               
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我自己就要耐用!(當要係要爆同有持久力)...因為我一個月都可能行成百排電..排排都GTB Lipo-Cut (6.25v)

So when buying a Lipo for racing there should be 2 things to consider. One is performance and the other is cycle life.

我o既方針無錯

原帖由 sunnychan 於 2009-2-10 01:54 發表

                               
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So when buying a Lipo for racing there should be 2 things to consider. One is performance and the other is cycle life.

我o既方針無錯

所以我講咗好多次,排電C數高,唔係解電壓高,只係指佢電流高.
當然,亦都可以表示出佢用料O既質素比較好.

一開始已經係咁講.

原帖由 kiev 於 2009-2-10 01:52 發表

                               
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炸唔炸得晒個魚塘先 ...

$30玩可以令我跑得快過3.5R...你話勁唔勁
足足跑左5次

鋰電測試~

                               
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1. BY 7.4V 6000mah 25C+, 2. IP 7.4V 5000mah, 3. Team C 7.4V 5000mah  30c
測試完, 全部只行左 around 6~8 mins ,
因為set個cut-off高小小先 2S 先平行到....

所謂爆, 大家三隻差唔多, 開始時平路 wheelie...
唔知點解 IP尾速快 DD, TeamC, By差唔多...
然後全程Full雞, 吾知點 BY 行左 4 圈又出現腳軟又慢左, ip 尾速都係快 DD, TeamC 無差別..

再番 home 睇電壓, 都 OK~~~可能  BY 得 22C, 會腳軟~~

                               
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以上只是個人測試, 非任何第三者立場

[ 本帖最後由 manju 於 2009-2-10 13:53 編輯 ]

原帖由 sunnychan 於 2009-2-10 01:54 發表

                               
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So when buying a Lipo for racing there should be 2 things to consider. One is performance and the other is cycle life.

我o既方針無錯

冇錯....如果就你ge方針發展........舊電 應該唔會平~~!.....貴ge未必一定乎合你要求~~~~~不過平野似乎更加冇可能lo

http://www.test-pad.com/bts2002HS.asp

測試用機器

原帖由 AMAT 於 2009-2-10 01:53 發表

                               
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係,C數係解放電電流指數.但係要同容量一齊計.

2800MAH 30C, 唔一定大電流過5000MAH 20C.

22c5000同30c5000係咪後者大d呀???

原帖由 manju 於 2009-2-10 01:58 發表

                               
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鋰電測試~

                               
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http://i209.photobucket.com/albums/bb112/manju2/RC/P10309 ...

正呀!!咁試到啦!!22c係差d架喎!!但唔見得30C好囉!!仲要貴很多!!

原帖由 馮馮ymc 於 2009-2-10 02:02 發表

                               
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22c5000同30c5000係咪後者大d呀???

係,後者比前者電流可輸出量大.

原帖由 manju 於 2009-2-10 01:58 發表

                               
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鋰電測試~

                               
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http://i209.photobucket.com/albums/bb112/manju2/RC/P10309 ...

我用IP 3800 35C GTB Lipo-cut (6.25V), 幾十次回來看都係 ~3.2/cell 正負約0.01~0.07v)
所以我覺得好Match...講緊玩左幾十次..算係咁

原帖由 sunnychan 於 2009-2-10 02:10 發表

                               
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我用IP 3800 35C GTB Lipo-cut (6.25V), 幾十次回來看都係 ~3.2/cell 正負約0.01~0.07v)
所以我覺得好Match...講緊玩左幾十次..算係咁

貴d都抵~~