Dɛn ne depth of discharge?

Depth of discharge yɛ ɔha biara mu nkyekyɛmu a woatwe afiri batere mu. Sɛ wohyɛ aseɛ wɔ full na wo tu mmirika kɔ fam kɔ ​​20% a, ɛno yɛ 80% DOD. Ɛyɛ mmerɛw sɛnea ɛsɛ.

Nea enti a obiara dwen dodow yi ho ne cycle life. Battery datasheet biara ma wo cycle rating, nanso saa rating no nkyerɛ hwee a wunnim DOD a wɔsɔɔ hwɛe wɔ no. Cell rated for 4000 cycles at 50% DOD betumi ama wo 1200 cycles pɛ sɛ woretu mmirika no akɔ empty bere biara a. Mehunuu sɛ projects get hearned by this. Obi specs nhyehyɛe a egyina asɛmti kyinhyia nɔma a ɔnkenkan fine print, na mfe abien akyi no pack no yɛ toast.

The tradeoff obiara mpɛ sɛ ɔka ho asɛm .

Adeɛ no nie. Sallow cycling trɛw nkwa mu, nanso ɛkyerɛ nso sɛ woretua tumi a wode di dwuma da no ho ka. 100 kWh nhyehyɛe a anohyeto wom 60% DOD ma wo 60 kWh wɔ cycle biara mu. Anka wubetumi atɔ pack ketewaa bi na woatu mmirika no denneennen. Sɛ́ ebia ntease wom sɛ ɛno yɛ nea ntease wom no gyina nkwammoaa ho ka, ɛka a wɔbɔ wɔ nneɛma foforo a wɔde besi ananmu, beae a wɔhwɛ so, ne nneɛma afoforo bɛyɛ dunum so. Amansan nyinaa mmuae biara nni hɔ.

LFP nkwammoaa asesa akontaabu a ɛwɔ eyi so no. Mfeɛ anum a atwam no, na NMC a ɔde bɛkɔ 90% DoD no rebisa ɔhaw. Cathode fã no hwe ase. Oxygen loss, structure degradation, wɔn a wɔtaa susuw sɛ wɔyɛ wɔn no nyinaa. LFP nni saa huammɔdi modes no wɔ DOD a ɛkorɔn mu. Wubetumi apia no denneennen a asotwe koro no ara na ɛwɔ hɔ. Ɛno nti na stationary storage projects pii atu akɔ LFP ɛwom mpo sɛ ahoɔden a ɛyɛ den no yɛ bɔne sen saa.

Nea ekum nkwammoaa a ɛwɔ DoD a ɛkorɔn mu ankasa .

Anode fã no nya adwennwen wɔ tebea a ɛwɔ charge window no ano abien no nyinaa mu. Down a ɛbɛn zero no, woretwe lithium afi graphite a ɛpɛ sɛ ɛkura mu ankasa no mu. SEI layer no mu paapae na ɛyɛ nsakrae. Bere biara a ɛbɛyɛ nsakrae no, edi lithium pii na tumi a ɛwɔ mu no so tew. Ɛbɛn 100%, titiriw bere a woabɔ ka ntɛmntɛm no, wode wo ho to asiane mu sɛ wobɛbɔ wo ho ban. Nneɛma a ɛtra so no mu biara nyɛ papa mma nkwa tenten.

Cathode a ɛsɛe no gyina chemistry so kɛse. NMC111 yɛ nea ɛyɛ den sen NMC811 wɔ ahoɔden a ɛkorɔn mu, nanso NMC811 ma wunya ahoɔden a ɛyɛ den. Nickel cathodes a ɛkorɔn-Nickel no pɛ sɛ wogyae oxygen bere a woayɛ wɔn delithiate no atwam wɔ beae pɔtee bi. Saa oxygen no ne electrolyte yɛ adwuma na ɛma ɔhyew ba. Kɔ so yɛ saa na nkwammoaa no nyin ntɛmntɛm.

Mfiridwuma mu adwennwen ho hia sen sɛnea nnipa dodow no ara hu. Graphite hohoro bere a wo lithiate no. Silicon anodes no hohoro kɛse mpo. Deep cycling kyerɛ sɛ nsakrae kɛse bɛba, adwennwen kɛse wɔ electrode coatings no so, ɛyɛ hokwan kɛse sɛ delamination anaasɛ particle cracking. Silicon a ɛyɛ foforo-blend anodes no bi wɔ ɔhaw ankasa wɔ eyi ho.

Sɛnea nhyehyɛe ahorow di DOD anohyeto ahorow ho dwuma .

Battery sohwɛ nhyehyɛe biara wɔ Min ne Max SOC setpoints. BMS no remma wo nkɔ saa mfɛnsere no akyi. Nea adetɔfoɔ no frɛ no "0%" wɔ wɔn display so no, ebia ɛyɛ 5% anaa 10% ankasa SOC. Nea wɔfrɛ no "100%" no betumi ayɛ 95%. Wɔn a wɔyɛ no yɛ eyi de si wɔ margin.

Nsɛnnennen no ne sɛ tumi no yera bere a bere kɔ so no. Nkwammoaa a efii ase wɔ 100 AH no betumi ayɛ 85 AH wɔ mfe abiɛsa akyi. Sɛ wo BMS da so ara de mfitiaseɛ tumi boɔ no redi dwuma a, wo DOD akontabuo no yɛ mfomsoɔ. Nhyehyɛe pa recalibrate bere ne bere mu. nhyehyɛe ahorow a ne bo yɛ mmerɛw no nyɛ saa.

Temperature tow safe foforo gu mu nkwammoaa a ɛwɔ 0℃no betumi de ne tumi a wɔahyɛ no 60% pɛ ama sɛ wobɔ mmɔden sɛ wobɛtwe 100% DOD mpo a. Lithium no ntumi nkɔ ntɛmntɛm sɛnea ɛsɛ. Nhyehyɛe ahorow bi sɛe DOD anohyeto no ara bere a awɔw aba no. Afoforo nso ma wobɔ mmɔden na wudi nkogu ara kwa.

Nea meka kyerɛ adetɔfo .

Wɔ grid storage ho no, 80% DOD yɛ fɛ standard. Wo nya decent utilization a wonkum nkwammoaa no. Revenue stacking applications a ɛhia cycle pii da biara no betumi akɔ 70% de akora nkwa so. Backup power a ɛtra hɔ idle mmere dodow no ara betumi atɔ 90% anaa nea ɛboro saa wɔ mmere a ɛntaa nsi a ɛho hia no mu.

Owia a wɔde sie a wɔte mu no taa yɛ 80-90%. Tesla Powerwall no bɛyɛ 100% a wobetumi de adi dwuma, nanso wɔde wɔn ankasa nkwammoaa ne wɔn ankasa warranty akontaabu redi dwuma. Nnipa a wɔto so abiɛsa a wɔde wɔn ho hyɛ mu no taa yɛ nea ɛyɛ katee kɛse.

EV ahorow no nyinaa wɔ asase mfonini no so. 0-100% a wɔada no adi wɔ wo dashboard so no ne cell anohyeto ankasa nhyia. Wɔn a wɔyɛ no de tumi a ɛwɔ hɔ no sie n’afã abien no nyinaa. Sɛnea ɛdɔɔso no gyina pack nhyehyɛe ne sɛnea wɔn warranty nsusuwii ahorow no yɛ basabasa no so.

Nea ɛwɔ asɛm no mu ne sɛ DOD yɛ nhyehyɛe a wɔpaw, ɛnyɛ nɔma a wɔahyɛ da ayɛ. Wogyina sikasɛm, asiane a wɔde gyina ano, ne ahwehwɛde ahorow a wɔde di dwuma so na ɛpaw. Obiara a ɔbɛka akyerɛ wo sɛ mmuaeɛ baako a ɛteɛ wɔ hɔ ma tebea biara no anyɛ projects a ɛdɔɔso.