Chii chinonzi Overvoltage?
Ndakatambira runhare kubva kumubatanidzwa wepakiti muOhio neChipiri chapfuura. Vaive ne14S LFP pack iyo yakadzoka kubva kune solar install ine maseru maviri achiverenga 3.91V. LFP. Haufanire kuona chero chinhu chiri pamusoro pe3.65V mukushandiswa kwakajairwa. Masero aitaridzika zvakanaka kubva kunze asi patakatsemuka rimwe rakavhurika cathode foil yaive yaita brown kumacheto. Classic overcharge kukuvara.
Zvinoratidza kuti vaishandisa lead{{0}asidhi charger. Mutengi akachinjanisa nekuti yekutanga yakafa. Lead{{3}asidhi 48V charger inodzima 58.4V kutatarika. Pane 14S LFP paki inoshanda kusvika ku4.17V pasero. Harisi dambudziko kune lead{10}asidhi. Dambudziko guru reLFP.
Chinhu cherudzi urwu chinoitika kupfuura zvinobvumwa nevanhu.
Overvoltage zvinoreva kusundidzira sero kupfuura iyo yakanyanya rated charge voltage. Nhamba yacho inoenderana nemakemikari. NMC uye NCA kumusoro kunze pa4.20V. Mamwe emhando dzeNMC dzepamusoro-dzine simba dzakapihwa ku4.35V asi aya maseru akasarudzika uye unofanirwa kuziva zvauri kuita nawo. LFP chemistry ine 3.65V sirin'i. LTO inenge 2.85V. Nhamba idzi dzinobva kune yesero mutengesi dhatabheti. Usavasiya uye uchava nematambudziko.
Kuparara kwemasero emukati
Chii chinoitika mukati mesero pane overvoltage haina kuoma. Iyo cathode zvinhu inoda kusiya okisijeni paunomanikidza yakawandisa lithium kubva mairi. Okisijeni iyoyo inopindirana ne electrolyte. Zvichakadaro, lithium simbi inotanga kubuda pamusoro peanode nekuti graphite haigone kutora maion nekukurumidza zvakakwana. Iyo plating yakaipa nekuda kwezvikonzero zviviri. Iyo isingadzoreki kurasikirwa kwesimba uye inogadzira madendrites anogona kupedzisira apfupisa sero mukati.
Vanhu vazhinji vanofunga kuti kune margin yakavakirwa muiyo 4.20V spec. Hapana.
Vagadziri vemasero vanoisa muganhu iwoyo panguva iyo kuderedzwa kunenge kusingatenderwi. Kuenda ku4.25V kamwe chete kungangove kwakanaka. Kuenda ikoko kutenderera kwega kwega kunouraya sero mumazana mashoma ekutenderera panzvimbo pezviuru zvishoma. Kuenda pamusoro pe4.30V uye iwe unogona kusawana mazana mashoma kutenderera. Ndakaona maseru achizvimba pa4.35V mushure mekubhadharisa kamwe chete. Zvinoenderana nesero.
Basa reBMS
Iyo BMS inofanirwa kubata izvi. Sero rega rega riri mupakiti rinowana waya yaro yekunzwisisa. Iyo AFE chip inoverenga ese maseru voltages uye inoenzanisa inopesana nechikumbaridzo. Kana chero sero rikapfuura, kuchaja kunomira. Pretty simple.
Kunze kwekuti BMS inogona kukundikana. Ndakaona BMS mabhodhi ane inotonhora solder majoini pane pfungwa waya yekubatanidza. Sero rimwe rinomira kutaura uye iyo firmware inomira kune zero pane kumisa mhosva. Ndakaona machipisi eAFE anodonha kunze kwecal pamusoro pekupisa. TI's BQ76940 kazhinji yakasimba asi iyo yekare BQ76925 yaive nenyaya nekuchinja kwemukati referensi. Yakachipa Chinese AFE machipisi anogona kunge ari kwese kwese.
Kuenzanisa kunokosha kupfuura kufunga kunoita vanhu. Paki ine maseru gumi munhevedzano ichave nekumwe kupararira muhukuru. Sero rimwe rinorova full charge pamberi pemamwe. Kana kuenzanisa kuri kunonoka sero rakakwirira rinogara pa4.20V apo ikozvino inoramba ichiyerera ichipinda mupakiti. Magetsi ari pasero iroro anokwira. Ne passive balancing iwe unoganhurwa nehuwandu hwekupisa kwaunogona kudurura kuburikidza nezvinodzivirira kubuda ropa. Mazhinji madhizaini anomhanya 50mA kusvika 100mA chiyero chazvino. Kana masero ako akakanganiswa neanopfuura mashoma muzana anogona kunge asina kukwana.
Active balancing inofambisa charge kubva kumaseru akakwirira kuenda kumasero akaderera pane kuipisa. Zvimwe zvinodhura. Zvakawanda zvakaoma. Zvine musoro kune makuru mapaketi uko simba rakaraswa rinowedzera kumusoro kana kune maapplication kwausingakwanise kushivirira chero kugona kupararira.
Charger design ndiyo imwe hafu ye equation. Iyo switching converter ine sloppy mhinduro regulation ichapfuura pane yakaremerwa mutoro. Ndakayera majaja anoburitsa 42.5V kana paki ichikwevera isingasviki 100mA padyo nekupera kwechaji. Iyo yekuwedzera hafu yevolti yakagoverwa mumaseru gumi ndeye 50mV imwe neimwe. Haisi njodzi asi inowedzera pamwe nekumwe kushivirira.
Muripo wetembiricha muchaja zvine basa zvakare. Lithium maseru anofanira kuchaja kune yakaderera voltage kana kuchipisa. Mamwe majaja anogadzirisa iyo CV setpoint yakavakirwa pane thermistor. Zvizhinji zvakachipa hazviiti. Paki yakagara muzuva pa45C ichichajwa kune yakajairwa 4.20V pasero iri kunyatsochajiswa.
Zviviri zvekudzivirira zviri nani pane imwe. Iyo BMS inotarisa maseru voltages. Yechipiri yekudzivirira IC inogona kutarisa pack voltage uye kucheka FET kana chimwe chinhu chikatadza. YeOhio pack yakatanga iyi nhaurirano yese, hapana yaivepo. Vaive neBMS mbeveve yaiita kubalance chete. Hapana dziviriro. Mutengi akafunga kuti charger yaizozvibata. Kufungidzira kwakaipa.
Dhizaini Yekutarisa
Kana iwe uri kugadzira mapakeji iwo ekutarisa ipfupi.
- Shandisa BMS ine cell chaiyo-level OVP.
- Seta chikumbaridzo neimwe margin, pamwe 4.18V yeNMC.
- Ita shuwa kuenzanisa kunogona kuenderana nesero rako rakapararira.
- Kodzera charger mukati mehamvuropu yayo yekushandisa kwete chete pakamuri temp pabhenji.
- Wedzera yechipiri nzira yekudzivirira kana application ichiipembedza.
Iyo Ohio paki iri kuvakwa patsva neBMS chaiyo uye charger yakatsanangurwa yeLFP. Chidzidzo chinodhura. Zvingave zvakanyanya. Hapana akakuvara uye hapana chakabata moto. Hazvisizvo nguva dzose kuti nyaya idzi dzinopera sei.
