Binciken Aikace-aikacen 3.2V 304Ah LF304K LiFePO4 Kwayoyin a Kashe-Grid Solar Systems A ƙasa -20°C

Lokacin gina zaman kanta, kashe-grid photovoltaic (PV) Tsarukan da ke cikin yankuna masu tsananin sanyi-musamman mahalli da ke faɗuwa ƙasa -20°C—ƙananan haƙurin yanayin zafi na baturin ajiyar makamashi shine abin yanke hukunci tsakanin nasarar tsarin da gazawar.. Ɗaukar 3.2V 304Ah LF304K babban tsari mai mahimmanci na aluminum-cased lithium iron phosphate (LiFePO4) tantanin halitta (yawanci ana nufin EVE LF304K) a matsayin nazari, binciko yuwuwar sa da ma'anar ma'ana a cikin yanayin zafi a ko ƙasa da -20 ° C yana da ƙimar injiniya mai mahimmanci..

Binciken Halayen Jiki da Sinadarai

Dangane da ƙayyadaddun batir na EVE da kaddarorin lantarki, Ayyukan batirin LiFePO4 a cikin matsanancin sanyi yana iyakance ta ƙimar watsawar lithium-ion na ciki da dankowar electrolyte..

1. Ayyukan Fitarwa: Kwayoyin LF304K na iya fitarwa a cikin ƙananan yanayin zafi na -20°C; duk da haka, m Ƙarfin da ake amfani da shi yana fama da raguwa mai yawa, juriya na ciki yana ƙaruwa, da fitarwa ƙarfin lantarki plateau faduwa. A lokacin da zazzagewa a 0.2C a -20 ° C, ƙarfin da aka saki yawanci ya kai kawai 70% ku 80% na iya aiki mara kyau a dakin da zafin jiki (25°C).

2. Yankin da aka haramta caji (Mahimmanci): Yana da an haramta shi sosai don cajin baturin ƙasa 0°C (Wasu samfura na musamman masu tsayi/sanyi ana iya ƙididdige su zuwa -10°C, amma don LF304K, 0°C shine madaidaicin ƙofa). Idan mutum yayi ƙoƙarin yin caji a -20 ° C, ƙarfe lithium zai ajiye a saman graphite anode (lithium plating), kafa dendrites wanda zai iya huda mai raba. Wannan yana kaiwa ga gajerun kewayawa na ciki, haifar da guduwar zafi mai tsanani da haɗari na wuta.

Rage Ma'ana: Za a iya amfani da su kai tsaye a ƙasa -20 ° C?

Dangane da halayen da ke sama, za mu iya zana wadannan tabbataccen ƙarshe:

• Ragewa 1: Yiwuwar fitarwa, amma yana buƙatar ƙarin ƙarfin aiki.

  A yanayin zafi ƙasa -20 ° C, lodin tsarin har yanzu na iya jawo wuta daga bankin baturi na LF304K (zaton cewa baturin bai daskarar da shi zuwa matsanancin zafi ba, kamar -30 ° C). Duk da haka, 304Ah za a rage ƙarfin ƙima sosai. Saboda haka, lokacin zayyana tsarin don tsananin sanyi, jimlar ƙarfin bankin baturi dole ne ya wuce 30%-50% don samar da gefen aminci.

• Ragewa 2: An haramta yin caji ba tare da ƙarancin zafin jiki ba.

  Tsarukan kashe-gid na hasken rana sun dogara da nau'ikan PV don cajin batura. A cikin yanayin -20 ° C ba tare da dumama ba, lokacin da rana ta fito kuma mai sarrafa hasken rana yana fitar da halin yanzu, Yin caji kai tsaye zai haifar da lahani na zahiri ga sel.

• Ragewa 3: Dogaro akan BMS tare da sarrafa zafi ya zama dole.

  Don aiki lafiyayye kuma amintacce ƙasa da -20 ° C, tsarin ba zai iya amfani da shi ba “tsirara” batura. Dole ne a sanye shi da tsarin sarrafa baturi (BMS) wanda ya haɗa da matattarar dumama ko tsarin sarrafa zafin jiki na ruwa. Kafin cajin halin yanzu ya isa sel, BMS dole ne ya ba da fifiko ta amfani da makamashi don dumama sel zuwa sama da 0°C (yawanci 5°C–10°C kafin a kunna caji).

Shawarwari na Kanfigareshan don Matsanancin Muhalli

Don tabbatar da tsarin kashe-grid ya tsira daga lokacin hunturu lafiya a -20 ° C ko ƙasa, ana bada shawarar saitin mai zuwa:

• Kwayoyin batir: 3.2V 304LF304K (Girma da aƙalla 30% iya aiki).

• BMS: Allon kariya mai kunna dumama (tare da na'urori masu auna zafin jiki na NTC don jawo dumama ƙasa 0 ° C).

• Insulation: Rufe bankin baturi a cikin akwati tare da kayan kamar kumfa polyurethane don hana asarar zafi da rage yawan amfani da makamashin dumama..

• Mai Kula da Rana: Dole ne ya goyi bayan ramuwar zafin jiki da za'a iya tsarawa da kariyar caji mara zafi (Saitunan DVCC) don samar da wani Layer aminci Layer.

Ƙarshe

Tantanin halitta 3.2V 304Ah LF304K LiFePO4 ba zai iya ba a yi amfani da shi lafiya a cikin ɗanyen yanayin sa don yin aiki mai cikakken zagayowar (caji da fitarwa) a cikin yanayin da ke ƙasa -20 ° C ba tare da kulawar thermal na ƙarin ba. Yayin da ake fitarwa a zahiri yana yiwuwa (duk da raguwar iya aiki), Cajin ƙananan zafin jiki shine cikakken yankin haɗari. Don amfani da waɗannan sel a cikin tsaunuka masu tsayi ko sanyi-yanayin kashe-grid, Dole ne ku ba su kayan da aka keɓe da kuma BMS mai amfani da dumama mai wayo. Ta hanyar amfani da wani yanki na makamashin hasken rana don kula da zafin ciki na sel sama da matakan aminci, kun tabbatar da tsawon tsarin tsarin duka da amincin aiki.

Da fatan za a tuntuɓi mu don ƙarin bayani.