3results about How to "Prevent electrolyte leakage" patented technology

Disclosed is a secondary battery. The secondary battery has a structure including an internal core portion containing an electrolyte having a relatively lower crosslinking degree, and surrounded with a peripheral portion containing an electrolyte having a relatively higher crosslinking degree. It is possible to provide an effect of improving both ion conductivity and mechanical properties by virtue of such structural characteristics. In addition, the electrolyte portion having a lower crosslinking degree is confined by the electrolyte having a higher crosslinking degree to provide an effect of preventing electrolyte leakage. In addition, the secondary battery can be obtained by a simple method that includes crosslinking only the peripheral portion before the core portion reaches to a crosslinking temperature and is crosslinked under an environment preheated to the crosslinking temperature or higher. As a result, there is no adverse effect upon the processing efficiency, since any separate device or system line is not required to carry out the crosslinking.

The present invention relates to a method of preparing a secondary battery which includes the steps of (S1) preparing a first gel polymer electrolyte composition including a first oligomer, and a second gel polymer electrolyte composition including a second oligomer; (S2) injecting the first gel polymer electrolyte composition into a battery case, in which an electrode assembly is accommodated, to impregnate inside of the electrode assembly with the first gel polymer electrolyte composition; (S3) injecting the second gel polymer electrolyte composition into the battery case; and (S4) curing the first gel polymer electrolyte composition and the second gel polymer electrolyte composition which have been injected into the battery case, wherein a content of the first oligomer in the first gel polymer electrolyte composition is less than a content of the second oligomer in the second gel polymer electrolyte composition.

The utility model relates to a battery field provides a kind of shell structure for battery, battery and electric equipment.Shell structure for battery includes shell body, recess is formed with on the side of shell body towards upper plastic, recess is recessed along the thickness direction of shell body and extends along the radial direction of shell body.This shell structure for battery can quickly, accurately detect the battery of missing seal, timely find problem battery, avoid defective product to flow into subsequent production link, help to improve the overall production efficiency of battery, reduce the time waste caused by manual inspection or other inefficient detection method, so that the battery on production line can quickly pass through detection link, enter next process, speed up the running speed of entire production process.