Wanem Em Karent Mejamen?
Husat manmeri i bin wok wantaim BMS i bin lukimSOCol riding we i no wankain olsem trupela samting. Bateri i soim 30% na forklift i dai wantu tasol. O em i winim 80% na kalap stret i go long ful. Lukluk long wanpela forklift forum na bai yu painim ol toktok long "bateri i soim 100% tasol em i no inap stat" o "wantu tasol em i pas long 25% SOC." Ating em i 'cell imbalance', 'bad balancing algorithm', o ol 'BMS bugs'. Tasol planti taim ol i no save tingim wanpela samting: ating mak bilong nau yet i no stret.
Putim wanpela 'precision resistor' wantaim 'circuit', skelim 'voltage drop', yusim Ohm's Law. Ol i kolim dispela 'resistor' olsem 'shunt'.
Ol EV na ol indastriel bateri sistem i save yusim ol 'shunt' insait long 25μΩ i go inap 100μΩ. Bilong wanem i daunbilo tru? Pusim 600A i go insait long wanpela 0.5mΩ shunt na yu lukim 180W bilong hat i lus. Dispela hat i mas go long wanpela hap. Planti prodaksen ikwipmen i gat ol 'thermal pathways' klostu long 'current sensing assembly' bilong stretim dispela hevi.
Ol 'hall effect sensor' i save skelim 'magnetic field' we i kamap long 'current flow' na i no save putim insait long 'main circuit'. Ol i wokim-insait long 'galvanic isolation'. Tasol stretpela wok i save bagarap long liklik karent-wanpela 1000A-reit Hall module we i gat 10A i ken soim planti taim moa asua winim long 500A. Planti BMS disain i save yusim Hall olsem bek-ap, wantaim ol shunt i save mekim namba wan sensing.
Instantaneous current em i hap tasol bilong piksa. BMS i nidim SOC, we i min olsem em i mas bungim karent long taim-coulomb kaunim. Sampling i gat nois na ofset. Ranim inap longpela taim na ol asua bai kamap planti. Ol sistem tru i save bungim 'coulomb counting' wantaim 'open-circuit voltage cross-checks, o yusim Kalman filtering. Kipim SOC error insait long 5% em i wanpela komon mak.
Wok bilong kamapim ol sel long faktori i nidim gutpela 'current accuracy' winim 'runtime BMS'. Fomesen karent i save afektim SEI leia kwaliti, we i save afektim sel konsistensi long olgeta hap. Ol 'production floor' i save yusim ol 'high-precision shunts wantaim 24-bit ADCs. Lab-greid tes i yusim ol fluxgate sensa-ppm-level accuracy, tasol i gat bikpela pe.
Wanem rot yu mas yusim i dipen long aplikesen. Ol 'forklift' i save lukim ol 'peak currents' bilong sampela handet amps taim ol i apim-BMS i mas karim ol dispela 'spike' na i no gat ol giaman 'trip'. Ol golf kat i save pulim liklik karent tasol ol i ken stap nating inap planti mun, olsem na skelim ol liklik self-discharge karent i bikpela samting moa.
