公开(公告)号：US20190189978A1

公开(公告)日：2019-06-20

申请号：US16318865

申请日：2017-07-24

Applicant: NEC ENERGY DEVICES, LTD.

Inventor： Naoyuki IWATA

IPC: H01M2/02 ,  H01M2/08 ,  H01M2/06 ,  H01M10/04

CPC classification number: H01M2/0287 ,  H01M2/02 ,  H01M2/06 ,  H01M2/08 ,  H01M10/04

Abstract: An electrochemical device comprising an electrode assembly in which two types of electrodes are stacked or wound with separators interposed therebetween and an outer container that accommodates the electrode assembly; wherein electrode terminals extend to the outside from within the outer container. The films which cover the electrode assembly overlap each other on the outside of the outer peripheral portion of the electrode assembly, and the outer container is formed by bonding the films to each other. The portion of the films that overlap and are bonded to each other comprises a first sealed portion in which the films overlap and are bonded to each other in an overlapping state with the electrode terminals interposed therebetween, and comprises a second sealed portion in which the films are bonded to each other in a directly overlapping state without interposition of the electrode terminals.

公开(公告)号：US20180183091A1

公开(公告)日：2018-06-28

申请号：US15735791

申请日：2016-06-15

Applicant: NEC ENERGY DEVICES, LTD.

Inventor： Tomoyuki ICHIKAWA ,  Shinsuke ENOMOTO ,  Naoyuki IWATA

IPC: H01M10/058 ,  H01M10/0525 ,  H01M10/0566 ,  H01M4/04

CPC classification number: H01M10/058 ,  G01R31/025 ,  G01R31/3865 ,  H01M4/0447 ,  H01M10/0525 ,  H01M10/0566 ,  H01M10/42 ,  H01M2300/0037

Abstract: A method of manufacturing a lithium-ion secondary battery of the present invention includes at least four steps as follows: an initial charging step of charging the lithium-ion secondary battery, which has not been subjected to initial charging, under a temperature environment ranging of equal to or higher than −20° C. and equal to or lower than 15° C.; an aging step of leaving the lithium-ion secondary battery under a temperature environment ranging of equal to or higher than 30° C. and equal to or lower than 80° C. after the initial charging step; a short circuit detecting step of detecting the presence or absence of a short circuit of the lithium-ion secondary battery by measuring a voltage drop quantity of the lithium-ion secondary battery and comparing the voltage drop quantity with a reference value; and a sorting step of sorting out a lithium-ion secondary battery in which no short circuit is detected.