US-12620631-B2 - Method for manufacturing battery, and battery

US12620631B2US 12620631 B2US12620631 B2US 12620631B2US-12620631-B2

Abstract

A method for manufacturing a battery includes: accommodating a stacked electrode body, in which a separator that has an adhesive layer and an electrode plate are stacked and the electrode plate is bonded to the separator via the adhesive layer, in a case; injecting an electrolytic solution into the case; and reducing the adhesive strength between the electrode plate and the separator at the same time, or around the same time, as the injection of the electrolytic solution.

Inventors

Shigeru Kondou
Kazutaka Nishikawa
Hiroshi Yamashita
Noriaki Yamamoto

Assignees

PANASONIC HOLDINGS CORPORATION
TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date: 20260505
Application Date: 20210310
Priority Date: 20200313

Claims (2)

1 . A method for manufacturing a battery, comprising: accommodating a stacked electrode body, in which a separator that has an adhesive layer and an electrode plate are stacked and the electrode plate is bonded to the separator via the adhesive layer, in a case; injecting an electrolytic solution into the case; and reducing an adhesive strength between the electrode plate and the separator before, during, or after the injection of the electrolytic solution; and wherein the stacked electrode body accommodated in the case is blown with gas so as to reduce the adhesive strength by wind pressure.
2 . The method for manufacturing a battery according to claim 1 , comprising: bonding a part of the electrode plate to the separator.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is the U.S. National Phase under 35 U.S.C. § 371 of International Patent Application No. PCT/JP2021/009538, filed on Mar. 10, 2021, which in turn claims the benefit of Japanese Patent Application No. 2020-043759, filed on Mar. 13, 2020, the entire content of each of which is incorporated herein by reference. BACKGROUND Field of the Invention The present disclosure relates to a method for manufacturing batteries and batteries. Description of the Related Art In recent years, shipments of in-vehicle secondary batteries have been increasing with the spread of electric vehicles (EV), hybrid vehicles (HV), plug-in hybrid vehicles (PHV), and the like. In particular, shipments of lithium-ion secondary batteries are increasing. Further, secondary batteries are becoming widespread not only for in-vehicle use but also as a power source for portable terminals such as laptop computers. Regarding such secondary batteries, for example, Patent Literature 1 discloses producing a stacked electrode body by stacking and thermo-compressing a separator having an adhesive layer and an electrode, and after the stacked electrode body is housed in a case, injecting an electrolytic solution into the case so as to produce a secondary battery. Patent Literature 1: PCT International Publication No. WO 2014/081035 In a secondary battery, an electrode reaction occurs in a state where an electrolytic solution is in contact with an electrode plate. Therefore, when producing a secondary battery, it is necessary to impregnate a stacked electrode body with an electrolytic solution. On the other hand, in order to increase the energy density of a secondary battery, the volume occupied by a stacked electrode body inside a case tends to increase. Therefore, the time required for impregnating a stacked electrode body with an electrolytic solution is increasing. The longer the impregnation time, the longer the production lead time of the secondary battery can be. Further, production facilities may be forced to increase in order to prevent a decrease in the throughput of secondary battery production. SUMMARY OF THE INVENTION In this background, a purpose of the present disclosure is to provide a technique for shortening the impregnation time of a stacked electrode body with an electrolytic solution. One embodiment of the present disclosure relates to a method for manufacturing a battery. This method for manufacturing a battery includes: accommodating a stacked electrode body, in which a separator that has an adhesive layer and an electrode plate are stacked and the electrode plate is bonded to the separator via the adhesive layer, in a case; injecting an electrolytic solution into the case; and reducing the adhesive strength between the electrode plate and the separator at the same time, or around the same time, as the injection. Another embodiment of the present disclosure relates to a battery. This battery includes a stacked electrode body in which a separator having an adhesive layer and an electrode plate are stacked, an electrolytic solution impregnating the stacked electrode body, and a case that accommodates the stacked electrode body and the electrolytic solution. The electrode plate is arranged to face the adhesive layer and has a non-bonded area that is not bonded with the adhesive layer in at least a part of a surface thereof that is facing the adhesive layer. Optional combinations of the aforementioned constituting elements, and implementations of the present disclosure in the form of methods, apparatuses, and systems may also be practiced as additional modes of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS Embodiments will now be described, by way of example only, with reference to the accompanying drawings which are meant to be exemplary, not limiting, and wherein like elements are numbered alike in several Figures, in which: FIG. 1A is a cross-sectional view schematically showing a part of a stacked electrode body used in a method for manufacturing a battery according to the first embodiment; FIG. 1B is a cross-sectional view schematically showing a part of a separator; FIGS. 2A-2B are schematic diagrams for explaining the method for manufacturing a battery according to the first embodiment; FIGS. 3A-3B are schematic diagrams for explaining the method for manufacturing a battery according to the first embodiment; FIGS. 4A-4B are schematic diagrams for explaining the method for manufacturing a battery according to the first embodiment; FIGS. 5A-5B are schematic diagrams for explaining the method for manufacturing a battery according to the first embodiment; and FIG. 6 is a schematic diagram of thermo-compression rollers used in the method for manufacturing a battery according to an exemplary variation. DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present disclosure will be described based on a preferred embodiment with reference to the figures. The embodiments do