Polymer li-ion batteries are widely applied into many fields: mobile phones, notebook, camcorder, wearable electronics electronic cigarette, bluetooth earphone, wireless communication equipment, portable DVD, electric toothbrush, space flight, aviation, ship communication, petrol oil, gas well, oil pipe-line automatic inspection ocean inspection. earthquake inspection, GPS tracking and satellite locating system ,remote sensing and telemetry, aeromodelling, lawn mower, electric boat, power tools and other new electronic products.