| 00:06.16 | DocScrutinizer05 | >>electrochemical cells with actual polymer electrolytes, which however have not reached full commercialization and are still a topic of research<< I wonder how obsolete this statement is. Prolly I could try to find out that it been written to wikipedia a 8 years ago, but I'm too lazy |
| 00:11.54 | DocScrutinizer05 | hmmph https://en.wikipedia.org/wiki/Research_in_lithium-ion_batteries |
| 00:14.37 | DocScrutinizer05 | also https://en.wikipedia.org/wiki/Lithium-ion |
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| 01:19.25 | arossdotme-planb | arr so the protection boards are call BMS |
| 01:19.29 | arossdotme-planb | *called |
| 01:22.49 | arossdotme-planb | 1st find http://www.aliexpress.com/item/4S-20A-11-1V-li-ion-BMS-PCM-battery-protection-board-bms-pcm-for-lithium-LicoO2/32388217872.html?ws_ab_test=searchweb201556_3,searchweb201644_4_10001_10002_10005_301_10006_10003_10004_62,searchweb201560_8,searchweb1451318400_6150 |
| 01:33.49 | arossdotme-planb | for a 4s4p 16AH pack this looks like a good candidate http://www.aliexpress.com/item/4S-16A-11-1V-li-ion-BMS-PCM-battery-protection-board-bms-pcm-with-balancing-for/32392606560.html?ws_ab_test=searchweb201556_3,searchweb201644_4_10001_10002_10005_301_10006_10003_10004_62,searchweb201560_8,searchweb1451318400_6150 |
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| 02:53.54 | roh | arossdotme-planb: important note: rc packs dont have balancers built-in like your notebook battery has |
| 03:03.09 | arossdotme-planb | or right the BMS does that? so i would need to buy a BMS that also has balancers built-in |
| 03:03.20 | arossdotme-planb | or=oh |
| 03:03.50 | arossdotme-planb | urrg i mean... |
| 03:04.12 | arossdotme-planb | rephrase: i would need to buy a BMS that also has balancers built-in |
| 03:09.10 | arossdotme-planb | roh, got any info i could educate my self as to why rc packs dont last so long? i thought it was because they where pushed hard. being constantly discharged to 3.0v, even extra fast charged and used very near to there discharge rate limit. |
| 03:09.57 | arossdotme-planb | append to 1st question in prev post: ...so long due to there build/quality ? |
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| 03:51.42 | roh | also i can recommend a book.. i dont know if its available online or in english... let me search for a link |
| 03:52.11 | roh | http://www.batteriebuch.de/ |
| 03:52.30 | roh | seems only to be german. sadly not online but print on demand |
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| 04:04.34 | arossdotme-planb | thanks |
| 04:19.44 | arossdotme-planb | roh, this protection board has a built in balancer what do you think? http://www.aliexpress.com/item/4S-16A-11-1V-li-ion-BMS-PCM-battery-protection-board-bms-pcm-with-balancing-for/32392606560.html?ws_ab_test=searchweb201556_3,searchweb201644_4_10001_10002_10005_301_10006_10003_10004_62,searchweb201560_8,searchweb1451318400_6150 |
| 04:22.34 | roh | ive seen both from china... worst thinkable crap and proper engineered equipment.. difficult to tell without buying one and taking it apart sometimes |
| 04:23.39 | roh | the bms must match the cutoff-values of the cells you are using. this one looks like a simple one which 'burns off' what the good cells have more than the worst one to level the pack (which is ok, most packs do that)) |
| 04:39.23 | arossdotme-planb | so theres more advanced bms boards available... any recommendations? |
| 04:43.49 | roh | not really.. ive seen some integrated ones in ebike packs which seemed nice |
| 04:44.10 | roh | but thats 48V 10Ah area stuff |
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| 04:45.03 | roh | i use from i got from a partially broken bionx ebike pack. it even has some step up and down converters. |
| 04:47.04 | roh | one is doing the charging from a 26V 3.5A dc supply into a pack which needs around 50-52V charge end voltage. so its a big step-up converter. the other one is fried, it did the ~48V discharge to ~6V stepdown for the bike lighting. its even configurable via the bus and the controller inside the pack |
| 04:53.12 | arossdotme-planb | ok |
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| 04:57.49 | arossdotme-planb | re using 18650 cells to make a pack. as the protected ones are 3x the price (ouch!). could i have two protection boards and have two 4s1p packs that i put in parallel. each pack has its own protechion board. would this setup have any problems? the advance being that instead of having cell sets in parrel where i dont know if one of the cells is not balanced, the 4S1P + protection board X2 will take care of that? |
| 04:58.17 | arossdotme-planb | advance=advantage |
| 05:09.36 | roh | using cells from not the same batch is not a good idea in general. |
| 05:09.49 | roh | especially when using them in parallel |
| 05:10.12 | roh | you need protection per pack, not neccessary per cell |
| 05:10.52 | roh | protection means overvoltage, undervoltage, overcurrent lockout |
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| 12:58.21 | arossdotme-planb | roh, thats what i mean, as the cells dont have protechion built in, I could add it with a BSM for each series cell lot |
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| 16:37.12 | roh | arossdotme-planb: i see.. well.. i think its better to only have one bms. not one per chain |
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| 17:53.12 | arossdotme-planb | roh, ok, idk |
| 17:53.24 | arossdotme-planb | arrgh its not easy :| |
| 17:53.53 | arossdotme-planb | why does a sony laptop protection board have a 8bit microchip? http://www.datasheetcatalog.com/datasheets_pdf/M/3/7/5/M37515M4-XXXHP.shtml |
| 18:09.18 | arossdotme-planb | oh yea, with my prev,prev post i meant with cells that is hopefully/had better be from the same batch, from the same order. |
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