Abstract:
PURPOSE: A battery cooling system is provided to reduce vortex within a battery, to enhance distribution property through uniform cooling flow rate supply, and to prevent the temperature rise of a specific cell. CONSTITUTION: A battery cooling system using a pressure reduction structure includes an air flow manifold with section change and a vent plate(5). The flow manifold enables the increase of a flow rate as cooling air flowing into the bottom of the battery in which unit cells are laminated is distanced from an inlet and also the increase of a flow rate as cooling air passing through the top of the battery flows into an outlet. The vent plate has at least one vent hole(6) for discharging the cooling air.
Abstract:
PURPOSE: A cross-linked ceramic-coated separator is provided to suppress thermal shrinkage at a high temperature due to heat resistance and mechanical property of ceramic materials and to improve resistance to external penetration. CONSTITUTION: A method for manufacturing a cross-linked ceramic-coated separator containing an ionic polymer comprises the steps of: (i) preparing a polymer solution by dissolving an ionic polymer in a solvent; (ii) preparing inorganic dispersion by dispersing ceramic particles and functional inorganic compounds in a solvent; (iii) uniformly mixing a hardener and an initiator into the two obtained solutions; (iv) applying the coating material solution to one side or both sides of a porous film substrate; (v) cross-linking the coated substrate through thermal polymerization or UV irradiation; and (vi) drying the manufactured separators.
Abstract:
PURPOSE: An olivine type positive active material for a lithium second battery is provided to produce a lithium secondary battery with high energy density due to a carbon coating layer with high conductivity. CONSTITUTION: An olivine type positive active material for a lithium second battery comprises a core material represented by chemical formula 1: Li_xM_yM'_zXO_(4-w)B_w and a carbon coating layer with high conductivity which surrounds the core material. The carbon coating layer includes at least one or two kinds of carbon precursor selected from polyvinylpyrrolidone, water-soluble polymer and conductive polymer.
Abstract:
PURPOSE: A tube type battery is provided to obtain emission effect of heat generated in a central part of each battery by connecting each battery in serials and in parallel. CONSTITUTION: A tube type battery is prepared by forming a cooling passage to an outer material(12) covering a battery unit. The battery unit comprises a positive electrode plate, negative electrode plate and separator. The cooling passage is formed by penetrating a through hole(14) along lengthwise direction at the center of exterior material for a fuel cell.
Abstract:
A method of preparing a positive active material is provided to save the production costs by not using inexpensive inert gas, to produce micro-sized particles with excellent crystallinity, and to cause no environmental contamination by using water as solven. A method of preparing a positive active material comprises the steps of: mixing a lithium precursor, transition metal precursor and phosphor precursor with a carbon precursor; after supplying the mixture with deionized water to a high pressure reactor(10), raising the temperature and pressure until they reach the supercritical water state in the high pressure reactor; after moving the materials synthesized by the supercritical water reaction in the high pressure reactor, to a cooling tank(20), cooling quickly while ejecting the synthesized materials, to grow the crystal to the circumference of the carbon precursor; and filtering the particles obtained from the crystal growth though a filter to obtain the C/LiMPO4 positive active material.