Dɛn ne nokware-bere sohwɛ?
Ɛsɛ sɛ BMS hu nea ɛrekɔ so wɔ pack no mu. Voltage wɔ cell biara mu, current nyinaa, ɔhyew wɔ mmeae pii. Saa data yi ba bere nyinaa, ɛnyɛ nhwɛsode pɛnkoro wɔ bere ne bere mu. Ɛno yɛ ankasa-bere sohwɛ.
Voltage susuw .
Eyi ne baabi a ɛka dodow no ara kɔ wɔ BMS nhyehyɛe mu.
Nkwammoaa anaa parallel kuw biara hia n’ankasa voltage sense line a ɛsan kɔ analog front end IC so. Sɛ 16S pack a ɛyɛ nea wotumi di ho dwuma. Sɛ wopɛ 100s + EV pack a, worehwɛ AFE chips pii daisy-abɔ mu, nkitahodi a atew ne ho wɔ wɔn ntam, ne wiring harness a egye mmɔdenbɔ ankasa na ama woafa ɔkwan a ɛho tew so. Noise pickup yɛ ɔko a ɛkɔ so daa. Nkate a ɛkɔ akyiri yɛ adwuma sɛ antenna. Twisted pairs boa. Sɛ wode kɔ soro-mprempren akwan fi nkate nhama ho a, ɛboa kɛse.
AFE accuracy spec no ho hia kɛse sen sɛnea nkurɔfo hwɛ kwan. NMC nkwammoaa no wɔ ebia 1.4V a wotumi de di dwuma voltage range. Wɔ 4.2V wo ho yɛ ma. Wɔ 4.25V no wore plating lithium na worekum nkwammoaa no. Ɛno yɛ 50mV a ɛwɔ margin. Sɛ wo AFE wɔ ±15mV pɛpɛɛpɛ a woahyew dedaw denam bɛboro fã wo sikasɛm nhyehyɛe so wɔ susudua mfomso nkutoo so. Eyi nti na High-voltage packs a efi lithium battery pack a ɛfata biara mu no de AFES-6815, 6813 a ne bo yɛ den no di dwuma, saa tier no. Wɔn a wɔn bo yɛ mmerɛw no yɛ adwuma yiye ma 4s power tool packs. Ɛnyɛ sɛ ɛyɛ traction.
LFP yɛ bɔne fafiri kɛse wɔ soro awiei nanso voltage curve no yɛ flat wɔ mfinimfini araa ma SOC estimation yɛ den. Wohia pɛpɛɛpɛyɛ pa esiane biribi foforo nti.
Foforɔ
Hall effect sensor anaa shunts. Asa ahorow no yɛ nea anyinam ahoɔden atew ne ho a ɛma adwini no yɛ mmerɛw. Shunts yɛ pɛpɛɛpɛ nanso ɛte mprempren kwan no mu, enti BMS sensing circuit hia sɛ edi common-mode voltage a ɛne pack voltage yɛ pɛ no ho dwuma. Ɛnyɛ ade ketewaa bi wɔ 400V nhyehyɛe so.
Shunts nso sɛe tumi. 100μΩ shunt wɔ 500A so tew 50mV na ɛhyew 25W. Ɛno ne ɔhyew a ɛsɛ sɛ wudi ho dwuma. Na shunt resistance drifts ne temperature, enti mprempren akenkan no drifts nso gye sɛ wotua ka. cheap BMS designs no nyɛ saa. Afei Soc nantew kɔ da koro mu na obiara nnim nea enti a ɛte saa.
Ahoɔhyeɛ
Thermistors yɛ nea ne bo nyɛ den. Placement yɛ ɔfã a ɛyɛ den.
Ebia na pack bi wɔ cells 200 nanso 6-8 temperature sensor ahorow pɛ. Ɛhe na wɔkɔ? Nkwammoaa a ɛwɔ geometric center no mu no yɛ hyew sen biara efisɛ ɔhyew afoforo atwa ho ahyia. Nkwammoaa a ɛbɛn casing no hwere ɔhyew ma ambient. Nkwammoaa a ɛbɛn busbars no fa ɔhyew a wɔayɛ no fi nkitahodi ahorow a ɛwɔ hɔ mprempren no mu. Lithium battery system yɛfoɔ bi a ɔreyɛ eyi no yɛ CFD yie anaasɛ anyɛ yie koraa no, ɔhyew nhwɛsoɔ a ɛyɛ mmerɛw ansa na ɔde ne ho ahyɛ sensor mmeaeɛ. Wɔn a wɔaka no de thermistor biako to module biara mu na wɔwɔ anidaso sɛ wobenya nea eye sen biara.
Ɛsɛ sɛ sensor no ka nkwammoaa no. Ɛnyɛ sɛ ɛrehuruw wɔ mframa mu wɔ baabi a ɛbɛn nkwammoaa no. Ɛkame ayɛ sɛ mframa mu hyew a ɛwɔ ɔdan a wɔabɔ ho ban mu no nkyerɛ wo hwee wɔ nkwammoaa no ani hyew ho. Yɛahu nsonsonoe 8-10 wɔ mframa ne nkwammoaa ani wɔ packs a ɛte sɛ nea ɛyɛ fɛ wɔ krataa so.
Thermal interface nneɛma nso ho hia. thermistor ne cell can ntam nkitahodi a ɛyɛ dry no wɔ ɔhyew a ɛkɔ soro. Akenkan no di nokwasɛm akyi. Bere a sensor no kyerɛ 45℃no, ebia nkwammoaa no wɔ 52℃ne foro dedaw.
Nea BMS no de data no yɛ .
Soc estimation ne ade titiriw. Coulomb a wɔkan no ka bom wɔ bere a ɛkɔ so no mu. OCV lookup correlates home voltage to state of charge. Kalman filters anaa nea ɛte saa ka abien no bom. Eyinom mu biara nyɛ adwuma pɛpɛɛpɛ. Coulomb Counting drifts ɛfiri sɛ mprempren susudua no nyɛ pɛpɛɛpɛ na worentumi nhu nokware mfiase no da. OCV lookup hia pack no sɛ ɛbɛhome kakra a ɛnsi wɔ adwumayɛ a ɛkɔ so mu. Kalman filter no boa nanso ɛyɛ papa te sɛ cell model a wɔde asi so no ara pɛ, na nkwammoaa no nyin.
SOH akontaabu kwan a ɛresɛe. Tumi no yera, resistance nkɔso. Eyi taa kyerɛ sɛ bere ne bere mu no, wɔde charge anaa discharge a wɔahyɛ so a wɔde bɛtoto ho na wɔde atoto nea wɔde gyina so no ho. Nhyehyɛe ahorow bi bɔ mmɔden sɛ ebebu akontaa wɔ intanɛt so afi adwumayɛ ho nsɛm mu. Ɛsono nea efi mu ba.
Ahobammɔ ho ntease yɛ mmerɛw. Voltage a ɛkorɔn dodo, gyae charge. Ɛba fam dodo, gyae discharging. Mprempren a ɛkorɔn dodo, twa nkitahodi no mu. Ɔhyew a ɛkorɔn dodo, derate anaasɛ disconnect. Eyinom yɛ threshold ntotoho ara kwa. Sɛ wonya thresholds no yie a, ɛgye adwene bi-Too tight na wo false-tu mmirika daa, ɛyɛ loose dodo na wo ma cells no sɛe.
Kari a wɔkari pɛ .
Nkwammoaa no mu paapae bere a bere kɔ so no. Passive balancing hyew fi ahoɔden a ɛboro so denam resistors so, mpɛn pii no wɔ 50-100mA. Ɛyɛ brɛoo. Wɔ nnɔnhwerew 4 charge cycle cycle passive balancing mu no betumi akɔ 200-400mAh. Sɛ wo cells no yɛ 2000mAh a ɛkari pɛ a ɛno deɛ ɛrentwa.
Active balancing transfers charge a ɛwɔ nkwammoaa ntam a wɔde inductors anaa capacitors di dwuma. ntɛmntɛm, ɛyɛ adwuma yiye, ɛyɛ adwuma yiye, ne bo yɛ den, ɛyɛ den. Wɔ mfiridwuma mu lithium battery ano aduru a packs cycle hard da biara da, active balancing yɛ ntease. Sɛ pack a ɛte 50% soc so dodow no ara a ɛtɔ mmere bi a wɔde di dwuma no, passive yɛ fine.
Nkutahodie
betumi bɔs ma kar ahorow. Modbus ma stationary. abien no nyinaa yɛ adwuma. Paw nea nhyehyɛe no nkae no de di dwuma biara.
Cloud connectivity no te sɛ nea eye wɔ krataa so. Wɔ nnwuma mu no, mmeae no fã wɔ nwura cellular signal na installer no ansiesie fist amma abɔnten antenna. Local data logging with periodic upload yɛ adwuma yiye ma aguadi lithium battery provider deployments dodow no ara sen sɛ wobɛfa no sɛ constant connectivity.
gyinapɛn ahorow .
ISO 6469 ne un ece r100 ma kar. UL 9540 ma baabi a wɔde nneɛma gu. OSHA ne mpɔtam hɔ ogya ho mmara a ɛfa mmeae a wɔbɔ ka wɔ mfiridwuma ho. Ɛsɛ sɛ lithium battery OEM hokafo hu nea ɛfa wo botae gua no ho. Isolation monitoring ahwehwɛde ahorow a ɛwɔ kar gyinapɛn ahorow mu no ma nkurɔfo kɔ soro sen biribi foforo biara wɔ dodow a wɔyɛ mu.
Real-bere a wɔde hwɛ nneɛma so no nyɛ nea wotumi paw. Asɛmmisa no ne sɛnea wuhia pɛpɛɛpɛyɛ ne nea ɛyɛ nwonwa, na ɛno gyina nkwammoaa no, nea wɔde di dwuma, ne nea ebefi mu aba sɛ ɛbɛma ayɛ mfomso no so.
