Yuav ua li cas cov diiodes txwv rov qab cov roj teeb hauv BMS?

一, cov phom sij thiab kev tiv thaiv uas yuav tsum tau tso tawm
Rov qab tawm ntawm lub roj teeb hais txog qhov tshwm sim uas qhov zoo thiab tsis zoo ntawm lub roj teeb nrog lub zog lossis lub zog los ntws tawm hauv kev coj rov qab. Hauv Lithium roj teeb siv roj teeb lithium roj teeb, thim rov qab tuaj yeem ua rau cov txiaj ntsig loj hauv qab no:

Kev puas tsuaj rau roj teeb qauv: ntau tshaj tawm ntawm lithium ions rau ntawm qhov tsis zoo electrode cov ntaub ntawv lithium dendode, tho qhov separator thiab ua rau muaj kev luv luv ntawm Circuit Court;
Risk of thermal runaway: Reverse current generates Joule heat, accelerates electrolyte decomposition, and may cause fire or explosion;
System level malfunction: Reverse voltage may damage precision components such as BMS main control chip and AFE (analog front-end).
Raws li cov cai ntawm GB / T 38661-2020 txheem, BMS yuav tsum muaj kev ncaj ncees nyob rau hauv ISO7637 mem tes kuaj. Qhov kev ua kom nruj ua kom muaj kev tiv thaiv cov tub ntxhais ua cov kws tiv thaiv kev tiv thaiv kev tiv thaiv.

2, Lub ntsiab cai qhia txog Diode Anti Rov Qab Tawm
1. Qhov yooj yim unidirectional mchicism
Cov yam ntxwv tseem ceeb ntawm Diode yog cia tam sim no kom ntws los ntawm anode (a) rau cathode (k) thaum thaiv hauv kev coj rov qab. Tom qab txuas cov Diode hauv koob nrog BMS lub zog ntawm lub davhlau ya nyob twg, thaum lub zog polarity yog qhov tseeb, cov diode yog nyob rau hauv ib qho chaw pib ua, cia li hla dhau los; Thaum lub zog hluav taws xob tau thim rov qab, cov diode txiav tawm hauv kev thim rov qab, thaiv txoj kev tam sim no.

Cov Ntaub Ntawv Thov Raug Cai:
Lub rooj tsavxwm tswj hwm ntawm Tesla Qauv ntawm Tesla Qauv 3 adopts diode (sma pob, rov qab withstand voltage 40v) raws li anti rov qab txuas cov khoom sib txuas. Cov txheej txheem no siv cov voltage qis rau hauv qab cov yam ntxwv ntawm 0.3v, uas yog 40 d ua ntej, uas yog 40%

2. Kev tiv thaiv kev tiv thaiv ntawm cov hluav taws xob kev kub siab (TVs)
Cov txheej txheem Diode yooj yim muaj ob qho kev tsis sib haum:

Thim rov qab withstand voltage txwv (zoo tib yam ib txwm muaj<200V)
Tsis muaj peev xwm daws nrog kev kub siab - voltage pulses
Yog li ntawd, kev lag luam feem ntau adopts ib qho kev tiv thaiv ib qho kev tiv thaiv architecture ntawm "TVs + Diode":

TVs Diode: parallel txuas nrog lub hwj chim tso tawm davhlau ya nyob twg, nrog lub sijhawm teb ntawm<1ps, can clamp transient high voltage to a safe range in nanoseconds (such as SMCJ series can clamp 1000V pulse to 53.9V);
Anti rov qab Diode: series txuas nrog lub nraub qaum ntawm TVs, lub luag haujlwm rau kev thim rov qab txiav cov haujlwm.
Piv txwv ntawm BMS tsim rau qee yam hluav taws xob cia khoom:
Hauv 48v system, 6600W TVS (Clamp Voltage 35.5V) ntim rau hauv kev ua-218ab yog ua ke nrog 400v voltage resistant Diode. Cov txheej txheem no tau dhau mus rau ISO7637 mem tes 5A Test (Tsim cov txheej txheem siab hloov tshiab ntawm 35v thaum lub sij hawm 12v thaum lub sij hawm thim rov qab voltage ntawm -100V.

3, cov lus tseem ceeb rau kev xaiv ntaus ntawv
1. Thim kev voltage kam (vrrm)
Yuav tsum muaj raws li:

VRRM ntau dua los yog sib npaug rau 1.2 × vsystem_max
Piv txwv li, hauv 60v roj teeb system, donges nrog VRRM ntau dua lossis sib npaug ntawm 72V yuav tsum tau xaiv. Kev siv tshuaj qib qib tau tseem yuav tsum xav txog qhov yuav tsum tau ntawm -14V Nruam Rov Qab Voltage hauv ISO16750 tus qauv.

2. Forward Conduction Voltage Poob (VF)
Nyob rau hauv cov xwm txheej siab tam sim no, VF ncaj qha cuam tshuam cov txheej txheem txuag hluav taws xob:

Cov Silicon Diodon Diode: 0.7-1.1V (poob mus txog 70-110W ntawm 100a)
Schottky diode: 0.2-0.5v (poob txo los ntawm 60%)
Synchronous rectification mos lub tswv yim:<0.1V (but requires complex driving circuit)
Kev lag luam cov ntaub ntawv:
Thaum muaj kev tso tawm tam sim no ntawm 200a, siv schottky diodes tuaj yeem txo rau 100W thaum tshav kub kub, ua rau 30% txo qis hauv BMS cov nqi kub dissipation.
4, kev lag luam qauv thiab thev naus laus zis
1. Kev sib cav ntau dua ntawm lub cev hloov cov kev daws teeb meem
Txawm hais tias PMOs Anti cov ntaub ntawv txuas txuas rov qab muaj qhov zoo ntawm XOOM Voltage nco (ntawm) tuaj yeem qis li 0.5m ω), nws muaj peb qhov kev tsis txaus ntseeg:

Thim rov qab withstand voltage txwv (hom kev kawm txog kev lag luam pmos feem ntau<100V)
Cov nqi siab dua (3-5 zaug siab dua cov diodes ntawm tib qho kev tshwj xeeb)
Muaj ib qho hluav taws xob poob qis thaum lub sijhawm txiav disconection
Cov ntaub ntawv ntsuas ntsuas:
Kev kuaj ntshav bms tau pom tias thaum lub zog muab cov tshuaj volutage kom poob ntawm tus nqi ntawm 10V / MS, uas yuav ua rau muaj kev tiv thaiv tsis zoo ntawm kev ua tsis tau zoo; Cov txheej txheem Diode tuaj yeem txiav tam sim ntawd lub Circuit Court.

2. Fusion daim ntawv thov ntawm cov khoom siv tshiab
Kev lag luam yog tshawb txog cov kev daws teeb meem hauv qab no:

Sic Schottky Diode: voltage withstand nce rau 650V, VF txo mus rau 0.8v, haum rau siab- voltage ceev them rau cov xwm txheej ceev;
Ntse ntsoos diode module: sib txuas lus rov qab nrhiav kom tau, thiab xwm txheej qhia txog kev ua haujlwm, yooj yim BMS tsim;
Mem cov thev naus laus zis: Siv cov tshuab ntsuas microelectromechanical kom ua tiav cov kev thaiv tsis muaj kev ploj mus, tab sis tam sim no tus nqi yog qhov siab dhau.
3. Qhov kev txhawb nqa lub luag haujlwm ntawm cov qauv thiab cov cai
ISO 26262 Kev Nyab Xeeb Kev Nyab Xeeb: Xav kom tiv thaiv kev rov qab los tiv thaiv kab mob kom muaj asil {{} b theem refundancy tsim;
GB / T 38031-2021: Nws yog qhov xav tau meej meej uas yuav tsum tau hais tias BMS txiav tawm ntawm Circuit Court nyob rau hauv 1 thib ob thaum txuas rau hauv qab;
UL 2580: Nws yog cov txheej txheem uas tau hais tias cov roj teeb uas yuav tsum muaj cov peev txheej bidirectional tam sim no.
5, Raug Daim Ntawv Teev Kev Ntsuam Xyuas
1. BMS rau lub zog hluav taws xob tshiab
BYD hniav roj teeb BMS Engy tau txais peb {}}}}}}}}}}}}}} schottky diode fuse "tus kheej rov qab fuse":

Qib 1: 1500W TV GR Clamp Chanient Helvage
Ob Theem: 40v Schottky Diode Rov Qab Cutoff
Theem 3: PPTC siv tau overcurrent tus kheej kev tiv thaiv tus kheej rov qab
Cov phiaj xwm no tau dhau tag nrho cov kev ntsuas mem tes raws li ISO7637, nrog kev tiv thaiv rov qab teb tsawg dua 50ns.

2. Lub Zog Cia Lub Tshuab BMS
Catl's 48V Zog Cia BMS Ua tau zoo adopters a "rov qab} {2} Rov qab los ntawm" Diode "

Them Txoj Kev: PMOS tiav PUSTAL Voltage Tee Conduction
Kev Tawm Txoj Kev: DOOMOE muab kev sib cais
Nqi Txhim Kho Kom Ua Kom Zoo Dua: Tshem Mos Hloov Los Ntawm Diodes, txo cov nqi zog los ntawm 18%
6, Technological cov kev sib tw thiab kev cob qhia kev cob qhia
Kev lag luam tam sim no yog ntsib ob qho kev tsis sib haum xeeb:

Kev ntsuas kev ua haujlwm tau zoo thiab kev nyab xeeb: Tsawg VF cov khoom siv (xws li gan dodes) muaj cov nqi siab;
High voltage trend: The 800V platform requires protective devices to withstand voltage>1000v, thaum lub sij hawm ntau tshaj plaws clubage ntawm cov TV uas twb muaj lawm tsuas yog 660v xwb.
Yav tom ntej Technological kev loj hlob yuav tsom rau:

Cov ntawv thov loj ntawm cov khoom bandgap ntau (SIC / GAN);
Digital tiv thaiv thev naus laus zis (xws li AI raws li kev ua txhaum cai);
Qauv qauv tsim qauv (xws li IP tus IP uas ua raws li cov autosar specifications).