Battery system containing phase change material-containing capsules in interior configuration thereof

Abstract

Provided is a battery system in which an interior part of a battery structure includes particles (phase-change particles) containing materials (phase-change materials) having a high latent heat of phase change at a specific temperature, contained in a capsule made of an inert material. The battery system in accordance with the present invention can prolong a service life of the battery by inhibiting temperature elevation inside the battery under normal operating conditions without substantial effects on size, shape and performance of the battery, and further, can inhibit the risk of explosion resulting from a sharp increase in temperature inside the battery under abnormal operating conditions, thereby contributing to battery safety.

1 . A battery system in which an interior part of a battery structure includes particles (phase-change particles) containing materials (phase-change materials) having a high latent heat of phase change at a specific temperature, contained in a capsule made of an inert material;
 wherein the outer surface of the phase-change particles is coated with a conductive material.   
     
     
         2 . The battery system according to  claim 1 , wherein the battery system is a lithium secondary battery. 
     
     
         3 . The battery system according to  claim 1 , wherein the phase-change material is paraffin. 
     
     
         4 . The battery system according to  claim 1 , wherein the specific temperature is in the range of 0° C. to 120° C. 
     
     
         5 . The battery system according to  claim 4 , wherein the specific temperature is in the range of 40° C. to 120° C. 
     
     
         6 . The battery system according to  claim 1 , wherein the conductive material is a metal, carbon black, or a conductive polymer selected from the group consisting of polypyrrol, polyaniline, polyacetylene and their derivatives. 
     
     
         7 . The battery system according to  claim 1 , wherein the phase-change particle are included in an electrode active material. 
     
     
         8 . The battery system according to  claim 1 , wherein the phase-change particles have a particle diameter of 0.1 to 1000 μm.