Ol as bilong bateri i senis na i go bikpela bihain long 'cycling'
Kampani bilong ol 'lithium polymer battery' we i gat nem long wol-JXBT
Bihain long 'cycling', ol as bilong bateri i senis na i go bikpela:
'Pole piece expansion' i bruk i go long 'physical' na 'chemical expansion';
1. Ekspansen bilong bodi:
Risen analisis bilong winding sel:
Bihain long ol i bin 'grate' o 'cycling' inap sampela wik, 'medium-' na '-smol sais 'winding lithium polymer battery' i save senis long 'thickness' bilong en. Bihain long ol i sasim na rausim bateri, bikos long senis bilong samting (bikpela hap bilong 'pole piece' na 'isolation film'), insait bilong sel i liklik tumas long kona, na 'stress concentration' i kamap long bikpela bilong sel, na dispela i mekim na 'cell pole piece' i tanim na sel i benk na senis;
2. Kemikel ekspansen:
As bilong kemikel i kamap ples klia olsem 'pole piece' i go bikpela;
Tiknes bilong 'lithium-ion' bateri sel i go antap taim ol i sasim, na dispela i kamap bikos 'negative electrode' i go bikpela. Positif elektrod ekspansen reit em 2~4% tasol, na negitiv elektrod em i save kamap long 'graphite', 'binder', na 'conductive carbon'. Ekspansen reit bilong 'graphite material' yet i save kamap long 10%. Ol bikpela samting we i save mekim senis long 'graphite negative electrode expansion rate' em: SEI film formation, State of charge (SOC) na ol narapela samting.
(wanpela). SEI film formation: Long taim bilong namba wan sasim na discharge bilong ol lithium ion bateri, electrolyte i save go insait long wanpela ridaksen riaksen long ol 'graphite particles' long 'solid-liquid interface', na kamapim wanpela 'passivation layer' (SEI film) we i karamapim pes bilong 'electrode material'. Generesen bilong SEI film i mekim 'anode thickness' i go antap tru, na bikos long SEI film, 'thickness' bilong sel i go antap long samting olsem 4%. Long lukluk bilong long-taim saikel proses, bihainim fisikel straksa na spesifik pes bilong ol narapela narapela grafait, saikel proses bai kamap long dissolusen bilong SEI na dainamik proses bilong nupela SEI prodaksen. Olsem, 'flake graphite' i gat bikpela 'expansion rate' moa long 'spherical graphite'.
(b). Long taim bilong 'cycle' bilong 'charged state cell', 'volume expansion' bilong 'graphite anode' na 'cell SOC' i gat gutpela 'periodic function relationship', olsem, taim ol 'lithium ions' i stap insait long 'graphite' (sel SOC i go antap), volium i save go bikpela isi isi Taim ol 'lithium ions' i lusim 'graphite anode', sel SOC i save go daun isi isi na isi isi volium bilong anoit i go antap i go daun.
(c). (3)Long lukluk bilong kompaksen densiti bilong samting, kompaksen densiti i gat bikpela impak long 'graphite anode'. Long taim bilong 'cold pressing' bilong 'pole piece', bikpela 'compressive stress' i save kamap insait long 'graphite anode film layer'. Dispela 'stress' i save kukim long bikpela hat insait long narapela 'pole piece'. Em i hat long lusim dispela wok olgeta. Taim ol i sasim na rausim bateri long olgeta taim, bikos long wok bung bilong putim na rausim litiam aion, 'electrolyte swelling' bilong 'adhesive', na ol narapela samting, 'membrane stress' i save lusim long taim bilong 'cycle' na 'expansion rate' i go antap. Long narapela sait, 'compaction density' i makim sais bilong 'pore volume' bilong 'anode membrane layer'. Pore volium insait long 'membrane layer' em i bikpela, we inap long kisim gut 'expanded volume' bilong 'pole piece'. Volium bilong ol hul i liklik. Taim hap bilong pos i go bikpela, i no gat inap spes long kisim dispela samting i go bikpela. Volium we i kamap, long dispela taim, inap long go autsait tasol long 'membrane layer', we ol i kolim olsem volium i go bikpela bilong 'anode sheet'.
(d). Ol narapela samting: strong bilong glu (strong bilong glu bilong intafes namel long glu, ol liklik hap bilong grafait, konduktiv kabon na karent kolekta), mak bilong sasim na rausim, strong bilong glu na elektrolaiit long swel, seip bilong ol liklik hap bilong grafait Bulk density bilong en na volium bilong en i go antap long taim hap bilong glu i bagarap saikel i gat sampela samting long 'anode expansion'.
Kalkulesen bilong 'expansion rate':
(Teknes bilong bateri bihain long ol i skruim-Tiknes bilong bateri pastaim long ol i skruim)/Teknes bilong bateri pastaim long ol i skruim * 100%
'Expansion coefficient' em i 'physical characteristics' bilong bateri, na 'cycle life' em i 'electrochemical characteristics'. I no gat wanpela stretpela rilesensip namel long tupela. Laip bilong bateri i makim namba bilong ol taim yu ken yusim bateri planti taim.
Ol samting bilong testim dispela saikel: 1C sasim na discharge karent, 300 saikel, bateri i no lik, nogat paia, nogat pairap, na bateri kapasiti i winim o wankain olsem 80%, we i soim olsem em i kwalifait.
Taim yumi tingim laspela prodak, sapos bateri i go bikpela i no bagarapim yusim bilong prodak (eksampel, bateri i go bikpela i no mekim haus bilong prodak i go bikpela/sekim kes), na bihain long saikel i bungim ol kain kain spesifikasen, bateri i ken yusim nomol;
