Lithium-ion battery electrode chu eng nge ni?
Electrode slitting hmanga siam a ni.
Slitting hi mechanical processing-ah chuan shearing an ti a, cutting tools form ang chuan oblique-blade shearing, flat-blade shearing, rotary shearing (or roll cutting), leh disc shearing te ang chi shearing method-ah then theih a ni.
Oblique-blade shearing-ah chuan a chunglam leh a hnuai lam inkar ah angle fixed a awm a, inclination angle chu a tlangpuiin 1℃~ 6℃a ni. A tlangpuiin, a chunglam blade chu a inclined a, Figure 7-2(a)-ah hian kan hmu a. A chung leh a hnuai blade te chu parallel an nih loh avangin cutting direction zawh zawngin force a awm a, chu chuan awlsam takin cut edge chu a tichhe thei a ni. Mahse, shearing area chu a tlem a, shearing force leh energy hmanna chu flat-blade shearing aiin a tlem zawk a, chuvangin shearing thick plate lian leh lian tak tak shearing machine-a shearing atan hman a ni a, a tlangpuiin electrode slitting atan hman a ni lo.
Flat-blade shearing hian oblique-blade shearing nen structure inang a nei a, a chung leh a hnuai lam blade edge te chu parallel an nih loh chuan, Figure 7-2(b)-ah hian kan hmu a ni. Distortion awm lovin cutting a hmu a, cutting quality tha tak a nei a, mahse shearing force hi a lian hle a, a tam zawk chu shearing machine te tak te leh blanking te thin plate leh films[1-2] atan hman a ni a, electrode cross-cutting atan pawh hman a ni bawk.
Rotary shearing pawh hi arc-edge roll cutting an ti bawk a, chu chuan arc-shaped edge nei tools a hmang a ni. Tools te hian fixed axes pahnih vel rotate leh rolling hmangin shearing process chu an ti zo a, Figure 7-2(C)-ah hian kan hmu a. A bik takin fixed-Length cross-cutting, head leh tail cross-cutting, leh edge slitting te tihhlawhtlin nan hman a ni. A tlangpuiin, medium leh thick plate shearing-ah chuan quality sang tak, energy hman tlem, dam rei, leh output sang tak a nei a ni [3].
Disc shearing chu disc-shaped cutter wheel pahnih, a chunga pakhat leh a hnuaia pakhat, figure 7-3-a kan hmuh ang hian continuous rotation hmanga tihfel a ni. Shearing lai hian uncoiled electrode sheet chu disc cutter opening-ah a lut a, a cut hnuah strip tam takah a then a ni[1]. Disc shearing hi plate te tak te, film te tak te, leh metal foils te longitudinal slitting atan hman a ni nasa hle.
Lithium-ion battery siamnaah chuan electrode sheet-a longitudinal cutting (slitting) hian disc shearing a hmang tlangpui a, cross-cutting hian flat-blade shearing a hmang thung. Automated production lines hian slitting an ti hmasa a, chutah chuan cross-cutting an ti leh thin. A tlangpuiin, a hnuaia thil mamawh te hi lithium-ion battery electrode sheets slitting-ah dah a ni:
1 Electrode sheet-a dimension sang tak accuracy;
2 Electrode sheet kilte chu a flat a, burr a awm lo va, a chhiat tlem a, electrode coating layer pawh a chhia lo;
3 Yield sang leh production efficiency sang.
Electrode sheet hmanga siam chhuah a ni.
Plastic materials atan chuan shearing process hi stage pathum ah then theih a ni[5-6]:
1 Blade chu plate chhungah a press tan a, a cut inkar plate material chu plastic deformation leh flow a tawk a, plastic deformation tamna chu plastic strain limit a thlen thlengin a kal a ni. Hei hi stage hmasa ber an ti a. He stage chhung hian plate material chu sheared a ni a, shear surface smooth tak a siam a, Figure 7-4(a) en rawh.
2 Blade chu plate chhungah a press chhunzawm zel a, a cut inkar ah chuan nucleate, propagate leh plate material ah a lut a. Cut inkar plate material chu tensile stress action hnuaiah tearing a tawk a, upper leh lower blades chu horizontal plane khatah a awm thlengin. Hei hi second stage an ti a. He stage-ah hian plate material chu a chhe tawh a, dull fracture surface a siam a, Figure 7-4(b) leh (c) en rawh;
3 Blade chu a press down chhunzawm zel. Plastic flow avang hian a cut inkar plate material chu blade te inzawmkhawmna gap te tak te ah extrude a ni. Blade cuts overlap a san chuan gap-a plate material chu a phelh a, a chhuah a, a sir lamah burr a siam a, Figure 7-4(d) en la, hmanrua a inthen thlengin. Hei hi burr formation stage an ti a. Tool separation process chhung hian tools hian plate material-ah smoothing emaw extruding effect a nei ang a, chu chuan dull fracture surface leh burrs te morphology a siam ang a, mahse a danglamna chu a tlem hle.
Cutting hnua shear cross-section chu Figure 7-5-ah hian a lang a, chu chu hmun thum a awm a: shear surface smooth, dull fracture surface, leh edge burr Dull fracture surface hi brittle fracture surface an ti bawk. A zau zawng hi material plasticity nen a inzawm a ni. Plasticity tha zawk nei material tan chuan dull fracture surface a te zawk a, a smooth shear surface a lian zawk a, metal flow siam chhuah a tam zawk a, chu chuan burrs a ti awlsam zawk a ni. A lehlamah chuan brittle materials tan chuan shear surface smooth a awm lo.
