Kodi Overvoltage N'chiyani?
Ndinalandira foni kuchokera kwa ophatikiza paketi ku Ohio Lachiwiri lapitalo. Anali ndi paketi ya 14S LFP yomwe idabwera kuchokera ku solar install ndi ma cell awiri akuwerenga 3.91V. LFP. Osawona chilichonse pamwamba pa 3.65V pakugwiritsa ntchito bwino. Maselo amawoneka bwino kuchokera kunja koma titang'ambika chimodzi chojambula cha cathode chinali chitasanduka bulauni m'mphepete. Kuwonongeka kwachabechabe chapamwamba.
Zinapezeka kuti anali kugwiritsa ntchito {{0}chaja ya asidi. Makasitomala adasinthanitsa chifukwa choyambiriracho chinafa. Chaja ya lead{{3}acid 48V imatulutsa 58.4V float. Pa paketi ya 14S LFP yomwe imagwira ntchito mpaka 4.17V pa selo. Sivuto la lead{10}acid. Vuto lalikulu la LFP.
Zoterezi zimachitika kwambiri kuposa momwe anthu amavomerezera.
Overvoltage imatanthauza kukankhira selo kupyola voteji yake yovomerezeka kwambiri. Chiwerengero chimadalira chemistry. NMC ndi NCA pamwamba pa 4.20V. Mitundu ina yamphamvu ya NMC yamphamvu kwambiri ndi 4.35V koma amenewo ndi ma cell apadera ndipo muyenera kudziwa zomwe mukuchita nawo. Chemistry ya LFP ili ndi denga la 3.65V. LTO ili pafupi ndi 2.85V. Nambala izi zimachokera ku deta ya ogulitsa ma cell. Musanyalanyaze iwo ndipo mudzakhala ndi mavuto.
Kuwonongeka kwa maselo amkati
Zomwe zimachitika mkati mwa cell pakutha kwamagetsi sizovuta. Zinthu za cathode zimafuna kusiya okosijeni mukamakakamiza kwambiri lithiamu. Mpweya umenewo umakhudzidwa ndi electrolyte. Pakadali pano zitsulo za lithiamu zimayamba kukwera pamtunda wa anode chifukwa graphite siyingathe kuyamwa ayoni mwachangu. Kuyikapo ndi koyipa pazifukwa ziwiri. Ndizosasinthika kuwonongeka kwa mphamvu ndipo zimapanga ma dendrites omwe amatha kufupikitsa cell mkati.
Anthu ambiri amaganiza kuti pali malire omangidwa mu 4.20V spec. Palibe.
Opanga ma cell amaika malirewo pomwe kunyozeka kumakhala kosavomerezeka. Kupita ku 4.25V kamodzi mwina ndikwabwino. Kupita kumeneko mkombero uliwonse udzapha selo mu mikombero mazana angapo mmalo mwa zikwi zingapo. Kupita pamwamba pa 4.30V ndipo mwina simungapeze maulendo angapo. Ndawona ma cell akufutukuka pa 4.35V pambuyo polipira kamodzi. Zimatengera cell.
Udindo wa BMS
BMS ikuyenera kugwira izi. Selo lililonse mu paketi limakhala ndi waya wake wozindikira. Chip cha AFE chimawerengera ma voltages onse a cell ndikufanizira ndi poyambira. Selo likadutsa, kulipiritsa kumayima. Zosavuta.
Kupatula BMS ikhoza kulephera. Ndawona matabwa a BMS okhala ndi zolumikizira zoziziritsa kukhosi pazolumikizira waya. Selo imodzi imasiya kupereka lipoti ndipo firmware imasintha kukhala ziro m'malo molemba zolakwika. Ndawona tchipisi ta AFE zomwe zimatuluka kuchokera ku cal chifukwa cha kutentha. TI's BQ76940 nthawi zambiri imakhala yolimba koma BQ76925 yakale inali ndi zovuta ndikusintha kwamkati. Tchipisi zotsika mtengo za China AFE zitha kukhala paliponse.
Kulinganiza zinthu n’kofunika kwambiri kuposa mmene anthu amaganizira. Paketi yokhala ndi ma cell khumi motsatizana idzakhala ndi kufalikira kwina. Selo imodzi imagunda zonse patsogolo pa ena. Ngati kusanja kukuchedwa kwambiri, cell yayitali imakhala pa 4.20V pomwe yapano imayendabe mu paketi. Mphamvu yamagetsi pa seloyo imakwera. Ndi kusanja kwapang'onopang'ono mumachepetsedwa ndi kuchuluka kwa kutentha komwe mungathe kutaya kudzera muzitsulo zoletsa magazi. Mapangidwe ambiri amayendetsa 50mA mpaka 100mA yotsalira pano. Ngati ma cell anu sakufanana ndi maperesenti angapo, izi sizingakhale zokwanira.
Kuchita bwino kumasuntha ma charger kuchokera ku ma cell apamwamba kupita ku ma cell otsika m'malo mowotcha. Zokwera mtengo. Zambiri zovuta. Ndizomveka pamapaketi akulu pomwe mphamvu zotayika zimawonjezera kapena pamapulogalamu omwe simungathe kulekerera kufalikira kulikonse.
Mapangidwe a charger ndi theka lina la equation. Chosinthira chosinthira chokhala ndi malingaliro osasamala chidzapitilira pakulemetsa. Ndayezera ma charger omwe amazimitsa 42.5V pomwe paketi imakoka zosakwana 100mA pafupi ndi kutha kwa charger. Theka lowonjezera la volt lomwe limagawidwa pama cell khumi ndi 50mV iliyonse. Osati tsoka koma zimaphatikizana ndi kulolerana kwina.
Kulipirira kutentha mu charger kumafunikanso. Ma cell a lithiamu amayenera kulipira kutsika kwamagetsi kukatentha. Ma charger ena amasintha ma CV potengera chotenthetsera. Ambiri otsika mtengo samatero. Phukusi lomwe likukhala padzuwa pa 45C ndikulipiritsa mpaka 4.20V wamba pa selo likulitsidwa bwino.
Magawo awiri achitetezo ndi abwino kuposa amodzi. BMS imayang'ana ma voltages a cell. IC yoteteza yachiwiri imatha kuyang'ana pakiti yamagetsi ndikudula FET ngati china chake chalakwika. Kwa paketi ya Ohio yomwe idayambitsa zokambirana zonsezi, palibe. Anali ndi BMS yosayankhula yomwe imangokhalira kulinganiza. Palibe chitetezo. Makasitomala adaganiza kuti charger ingayigwire. Lingaliro loipa.
Mapangidwe Owunika
Ngati mukupanga mapaketi mndandanda wazoyang'ana ndi waufupi kwambiri.
- Gwiritsani ntchito BMS yokhala ndi cell yeniyeni-level OVP.
- Khazikitsani malire ndi malire, mwina 4.18V ya NMC.
- Onetsetsani kuti kulinganiza kumatha kuyenderana ndi kufalikira kwa cell yanu.
- Konzani chojambulira pa envulopu yake yogwiritsira ntchito osati kutentha kwa chipinda pa benchi.
- Onjezani njira yachiwiri yachitetezo ngati pulogalamuyo ikuvomereza.
Phukusi la Ohio likumangidwanso ndi BMS yoyenera komanso chojambulira cha LFP. Maphunziro okwera mtengo. Zikanakhala zoipitsitsa. Palibe amene anavulala ndipo palibe chomwe chinagwira moto. Sikuti nthawi zonse nkhanizi zimatha.
