Ny dingana farany amin’ny famokarana batterie lithium dia ny manara-maso sy manara-maso ny batterie lithium mba hiantohana ny tsy fitovian’ny mody batterie sy ny fahombiazan’ny mody batterie. Araka ny fantatry ny rehetra, ny maody misy batterie miaraka amin’ny tsy fitoviana avo lenta dia manana fiainana lava kokoa, fa ny maodely tsy miovaova dia mora amin’ny fiampangana be loatra sy ny fivoahana tafahoatra noho ny fiantraikan’ny siny, ary ny fihenan’ny fiainan’ny batterie dia haingana. Ohatra, ny fahafahan’ny batterie samihafa dia mety hiteraka halalin’ny fivoahana samihafa amin’ny tady batterie tsirairay. Ny bateria manana fahaiza-manao kely sy tsy mahomby dia ho tonga amin’ny famandrihana feno mialoha. Vokatr’izany dia tsy afaka mahatratra ny fanjakana feno ny bateria manana fahafaha-manao lehibe sy tsara. Ny boltsan’ny batterie tsy mifanaraka dia mahatonga ny batterie tsirairay ao anaty tady mifanandrify hifampitondra. Ny batterie miaraka amin’ny voltase avo kokoa dia mameno ny batterie amin’ny voltase ambany kokoa, izay manafaingana ny fahasimban’ny batterie ary mandany ny angovon’ny tady batterie manontolo. Ny bateria manana tahan’ny famotsorana tena avo dia manana fatiantoka lehibe. Ny tahan’ny famotsorana tena tsy mifanaraka dia miteraka fahasamihafan’ny sata voampanga sy ny tanjaky ny bateria, izay misy fiantraikany amin’ny fiasan’ny tadin’ny bateria. Ary noho izany ireo fahasamihafan’ny bateria ireo, ny fampiasana maharitra dia hisy fiantraikany amin’ny fiainan’ny module manontolo.

Ny sary

FIG. 1.OCV- operating voltage – polarization voltage diagram

Ny fanasokajiana ny bateria sy ny fitiliana dia ny fisorohana ny fandefasana ny bateria tsy mifanaraka amin’ny fotoana iray ihany. Ny fanoherana ao anaty batterie sy ny fitsapana famotsorana tena dia tsy maintsy atao. Amin’ny ankapobeny, ny fanoherana anatiny dia mizara ho fanoherana anatiny ohm sy fanoherana anatiny polarization. Ny fanoherana anatiny Ohm dia misy akora electrode, electrolyte, fanoherana ny diaphragm ary fanoherana ny fifandraisana amin’ny ampahany tsirairay, ao anatin’izany ny impedance elektronika, impedance ionika ary impedance fifandraisana. Polarization fanoherana anatiny dia manondro ny fanoherana nateraky ny polarization nandritra ny electrochemical fanehoan-kevitra, anisan’izany ny electrochemical polarization fanoherana anatiny sy ny fifantohana polarization fanoherana anatiny. Ny fanoherana ohmic amin’ny bateria dia voafaritra amin’ny totalin’ny conductivity ny bateria, ary ny fanoherana ny polarization ny bateria dia voafaritra amin’ny alàlan’ny diffusion diffusion coefficient an’ny lithium ion ao amin’ny fitaovana mavitrika electrode. Amin’ny ankapobeny, ny fanoherana anatiny amin’ny bateria lithium dia tsy azo sarahina amin’ny famolavolana dingana, ny fitaovana mihitsy, ny tontolo iainana ary ny lafiny hafa, izay hodinihina sy adika etsy ambany.

First, process design

(1) Ny famolavolana electrode tsara sy ratsy dia manana votoaty ambany amin’ny conductive agent, ka miteraka fifindran’ny elektronika lehibe eo amin’ny fitaovana sy ny mpanangona, izany hoe, impedance elektronika avo. Mafana haingana kokoa ny bateria litium. Na izany aza, izany dia tapa-kevitra ny famolavolana ny bateria, ohatra, ny hery bateria mba handray ny tahan’ny zava-bita, dia mitaky ampahany ambony kokoa ny conductive mpandraharaha, mety ho lehibe tahan’ny fiampangana sy ny fivoahana. Ny batterie capacité dia kely kokoa ny fahafaha-manao, ny taham-pitaovana tsara sy ratsy dia ho avo kokoa. Ireo fanapahan-kevitra ireo dia raisina amin’ny fiandohan’ny famolavolana ny bateria ary tsy azo ovaina mora foana.

(2) there is too much binder in the positive and negative electrode formula. The binder is generally a polymer material (PVDF, SBR, CMC, etc.) with strong insulation performance. Although the higher proportion of binder in the original ratio is beneficial to improve the stripping strength of the poles, it is disadvantageous to the internal resistance. In the battery design to coordinate the relationship between binder and binder dosage, which will focus on the dispersion of binder, that is, slurry preparation process, as far as possible to ensure the dispersion of binder.

(3) Ny akora dia tsy mitovy miparitaka, ny conductive agent dia tsy miparitaka tanteraka, ary ny rafitra tambajotra conductive tsara dia tsy miforona. Araka ny asehon’ny sary 2, ny A dia ny trangan’ny fanaparitahana ratsy ny mpitari-dalana, ary ny B dia ny fiparitahana tsara. Rehefa mitovy ny habetsaky ny conductive agent, dia hisy fiantraikany amin’ny fiparitahan’ny conductive agent sy ny fanoherana anatiny ny bateria ny fiovan’ny fizotry ny fihetsehana.

Sary 2. Ny fanaparitahana ratsy ny fitaovana enti-mitondra (A) Fiparitahana mitovitovy amin’ny fitaovana enti-mitondra (B)

(4) Tsy levona tanteraka ny binder, ary misy poti micelle sasany, ka miteraka fanoherana avo lenta amin’ny bateria. Na inona na inona fampifangaroana maina, fampifangaroana semi-maina na fampifangaroana mando, dia ilaina ny famongorana tanteraka ny vovobony. Tsy afaka mikatsaka fahombiazana be loatra isika ary tsy miraharaha ny fepetra takian’ny tanjona izay ilain’ny binder amin’ny fotoana iray vao levona tanteraka.

(5) Ny hakitroky ny electrode compaction dia hisy fiantraikany amin’ny fanoherana anatiny ny bateria. Ny hakitroky ny electrode plate dia kely, ary ny porosity eo amin’ny poti ao anatin’ny takelaka electrode dia avo, izay tsy mety amin’ny fifindran’ny elektronika, ary ny fanoherana anatiny ny bateria dia avo. Rehefa mipetaka be loatra ny takelaka electrode, dia mety hihoatra ny poti-pofona electrode, ary lasa lava kokoa ny lalan’ny fifindran’ny elektrôna aorian’ny fanorotoroana, izay tsy mifanaraka amin’ny fiampangana sy ny famoahana ny bateria. Zava-dehibe ny mifidy ny tsara compaction hakitroky.

(6) Bad welding between positive and negative electrode lug and fluid collector, virtual welding, high battery resistance. Appropriate welding parameters should be selected during welding, and welding parameters such as welding power, amplitude and time should be optimized through DOE, and the quality of welding should be judged by welding strength and appearance.

(7) poor winding or poor lamination, the gap between the diaphragm, positive plate and negative plate is large, and the ion impedance is large.

(8) Ny electrolyte bateria dia tsy tafiditra tanteraka ao amin’ny electrodes sy ny diaphragm tsara sy ratsy, ary tsy ampy ny famatsiam-bola amin’ny famolavolana electrolyte, izay hitarika ho amin’ny impedance ionika lehibe amin’ny bateria.

(9) The formation process is poor, the graphite anode surface SEI is unstable, affecting the internal resistance of the battery.

(10) Ny hafa, toy ny tsy fahampian’ny fonosana, ny tsy fahampian’ny sofina amin’ny sofina, ny fahatapahan’ny bateria ary ny hamandoana avo lenta, dia misy fiantraikany lehibe amin’ny fanoherana anatiny ny bateria lithium.

Second, materials

(1) Ny fanoherana ny fitaovana anode sy anode dia lehibe.

(2) Influence of diaphragm material. Such as diaphragm thickness, porosity size, pore size and so on. Thickness is related to internal resistance, the thinner the internal resistance is smaller, so as to achieve high power charge and discharge. As small as possible under a certain mechanical strength, the thicker the puncture strength is the better. The pore size and pore size of diaphragm are related to the impedance of ion transport. If the pore size is too small, it will increase the ion impedance. If the pore size is too large, it may not be able to completely isolate the fine positive and negative powder, which will easily lead to short circuit or be pierced by lithium dendrite.

(3) Influence of electrolyte material. The ionic conductivity and viscosity of the electrolyte are related to the ionic impedance. The greater the ionic transfer impedance, the greater the internal resistance of the battery, and the more serious the polarization in the charging and discharging process.

(4) Ny fiantraikan’ny fitaovana PVDF tsara. Ny ampahany ambony amin’ny PVDF na ny lanjany molekiola avo dia hitarika amin’ny fanoherana avo lenta amin’ny bateria lithium.

(5) Ny fiantraikan’ny fitaovana conductive tsara. Ny fifantenana ny karazana conductive mpandraharaha dia manan-danja ihany koa, toy ny SP, KS, conductive graphite, CNT, graphene, sns, noho ny morphology samy hafa, ny conductivity fampisehoana ny lithium bateria dia somary hafa, dia tena zava-dehibe ny mifidy. ny conductive mpandraharaha manana conductivity avo ary mety ho ampiasaina.

(6) ny fiantraikan’ny tsara sy ny ratsy pole sofina fitaovana. Ny hatevin’ny sofin’ny pole dia manify, ny conductivity dia mahantra, ny fahadiovan’ny fitaovana ampiasaina dia tsy avo, ny conductivity dia mahantra, ary ny fanoherana anatiny ny bateria dia avo.

(7) ny foil varahina dia oxidized sy welded ratsy, ary ny aluminium foil fitaovana manana conductivity mahantra na oxide eo amin’ny ambonin’ny, izay hitarika ho amin’ny avo anatiny fanoherana ny bateria.

Ny sary

Fomba hafa

(1) Internal resistance test instrument deviation. The instrument should be checked regularly to prevent inaccurate test results caused by inaccurate instrument.

(2) Ny fanoherana anaty batterie tsy ara-dalàna vokatry ny fampandehanana tsy mety.

(3) Poor production environment, such as loose control of dust and moisture. Workshop dust exceeds the standard, will lead to the increase of internal resistance of the battery, self-discharge aggravated. Workshop moisture is high, will also be detrimental to lithium battery performance.