US-12620653-B2 - Battery and method for producing same

Abstract

Disclosed is a battery including: a battery can including a cylinder portion including an opening edge portion at one end portion thereof and a bottom portion closing the other end portion of the cylinder portion; an electrode body housed in the cylinder portion; and a sealing member fixed to the cylinder portion to seal an opening of an opening edge portion. The sealing member includes a lid portion covering the opening of the opening edge portion. A first engagement portion is formed in the end portion of the cylinder portion on the opening edge portion side, and a second engagement portion is formed in an end portion of the lid portion on an outer circumferential side. A first surface of the first engagement portion and a second surface of the second engagement portion are bonded, with the first surface and the second surface overlapping each other.

Inventors

• Kazumichi Shimizu
• Koji Funami
• Hiroshi Takasaki

Assignees

• PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Dates

Publication Date

20260505

Application Date

20191227

Priority Date

20181228

Claims (4)

1. 1 . A battery comprising: a battery can that includes a cylinder portion and a bottom portion, the cylinder portion having an opening edge portion at one of end portions of the cylinder portion, the other one of the end portions of the cylinder portion being closed by the bottom portion; an electrode body that is housed in the cylinder portion; and a sealing member that is fixed to the cylinder portion to seal an opening of the opening edge portion, wherein the sealing member includes a lid portion that covers the opening, a first engagement portion is formed in the end portion of the cylinder portion on an opening edge portion side, a second engagement portion is formed in an end portion of the lid portion on an outer circumferential side, a first surface of the first engagement portion and a second surface of the second engagement portion are bonded to each other, with the first surface and the second surface overlapping each other, the opening edge portion includes a first portion that is bent and extends outward of the cylinder portion in a radial direction that is perpendicular to an axial direction of the cylinder portion, and the first portion forms the first engagement portion, the first surface and the second surface are inclined obliquely with respect to the radial direction and the axial direction, the end portion of the cylinder portion on the opening edge portion side and the end portion of the lid portion on the outer circumferential side are bonded via an alloy portion, and the alloy portion contains iron and nickel, with a nickel content in the alloy portion of 1.4 mass % or more, an entirety of the end face of the lid portion on the outer circumferential side is covered with the alloy portion, or a portion of the end face of the lid portion on the outer circumferential side is covered with the alloy portion and a remaining portion of the end face of the lid portion on the outer circumferential side is covered with a first nickel layer, and a portion of the end face of the lid portion on the outer circumferential side is covered with the first nickel layer, a main surface of the lid portion that constitutes an outer surface of the lid portion is covered with a second nickel layer, and the first nickel layer is thicker than the second nickel layer.
2. 2 . A battery comprising: a battery can that includes a cylinder portion and a bottom portion, the cylinder portion having an opening edge portion at one of end portions of the cylinder portion, the other one of the end portions of the cylinder portion being closed by the bottom portion; an electrode body that is housed in the cylinder portion; and a sealing member that is fixed to the cylinder portion to seal an opening of the opening edge portion, wherein the sealing member includes a lid portion that covers the opening, a first engagement portion is formed in the end portion of the cylinder portion on an opening edge portion side, a second engagement portion is formed in an end portion of the lid portion on an outer circumferential side, a first surface of the first engagement portion and a second surface of the second engagement portion are bonded to each other, with the first surface and the second surface overlapping each other, the opening edge portion includes a first portion that is bent and extends outward of the cylinder portion in a radial direction that is perpendicular to an axial direction of the cylinder portion, and the first portion forms the first engagement portion, the first surface and the second surface are inclined obliquely with respect to the radial direction and the axial direction, the end portion of the cylinder portion on the opening edge portion side and the end portion of the lid portion on the outer circumferential side are bonded via an alloy portion, and the alloy portion contains iron and nickel, with a nickel content in the alloy portion of 1.4 mass % or more, a main surface of the lid portion that constitutes an outer surface of the lid portion is covered with a second nickel layer, and the second nickel layer is formed in a first region and a second region, the first region being located adjacent to the alloy portion, and the second region being located adjacent to the first region and opposite to the alloy portion, and the second nickel layer formed in the first region is thicker than the second nickel layer formed in the second region.
3. 3 . The battery in accordance with claim 1 , wherein either one of the first surface and the second surface includes a region that does not overlap the other one of the first surface and the second surface and is exposed to outside.
4. 4 . The battery in accordance with claim 2 , wherein either one of the first surface and the second surface includes a region that does not overlap the other one of the first surface and the second surface and is exposed to outside.

Description

CROSS-REFERENCE OF RELATED APPLICATIONS This application is the U.S. National Phase under 35 U.S.C. § 371 of International Patent Application No. PCT/JP2019/051607, filed on Dec. 27, 2019, which in turn claims the benefit of Japanese Application Nos. 2018-248606 and 2018-248605, both filed on Dec. 28, 2018, the entire disclosures of which Applications are incorporated by reference herein. TECHNICAL FIELD The present invention relates to a battery and a method for producing the same. BACKGROUND ART As a method for sealing an opening of a battery can after an electrode body is housed into the battery can, a method as disclosed in Patent Literature 1 is known in which an annular groove is formed by recessing the vicinity of the opening of the battery case (battery can) inward, thereafter, a gasket and a sealing plate are placed on an upper portion of the groove portion, and a crimp portion is formed by crimping an opening end portion of the battery case onto the sealing plate with the gasket interposed therebetween. CITATION LIST Patent Literature [PTL 1] Laid-Open Patent Publication No. H7-105933 SUMMARY OF INVENTION Technical Problem However, in the battery that includes the groove portion and the crimp portion, a sealing member is placed on the groove portion, and the crimp portion is formed on the sealing member with the gasket interposed therebetween, and thus the dimension in the height direction of the battery tends to be large in the vicinity of the sealing plate. Accordingly, there is a limitation on increasing the energy density of the battery. Solution to Problem An aspect of the present invention relates to a battery including: a battery can that includes a cylinder portion and a bottom portion, the cylinder portion having an opening edge portion at one of end portions of the cylinder portion, the other one of the end portions of the cylinder portion being closed by bottom portion; an electrode body that is housed in the cylinder portion; and a sealing member that is fixed to the cylinder portion to seal an opening of the opening edge portion, wherein the sealing member includes a lid portion that covers the opening, a first engagement portion is formed in the end portion of the cylinder portion on an opening edge portion side, a second engagement portion is formed in an end portion of the lid portion on an outer circumferential side, and a first surface of the first engagement portion and a second surface of the second engagement portion are bonded to each other, with the first surface and the second surface overlapping each other. Another aspect of the present invention relates to a method for producing a battery, the method including: a step of preparing a battery can that includes a cylinder portion and a bottom portion, the cylinder portion having an opening edge portion at one of end portions of the cylinder portion, the other one of the end portions of the cylinder portion being closed by the bottom portion; a step of preparing a sealing member that includes a lid portion that covers an opening of the opening edge portion; and a welding step of welding the sealing member to the battery can, wherein the battery can includes, in the opening edge portion, a first surface that is inclined obliquely with respect to a radial direction of the cylinder portion and is formed by the opening edge portion being bent, the lid portion includes, in an end portion of the lid portion on an outer circumferential side, a second surface that is inclined obliquely with respect to an axial direction of the cylinder portion, and the welding step is a step of placing the sealing member on the battery can in which an electrode body is housed so as to close the opening edge portion, pressing the first surface of the cylinder portion against the second surface of the lid portion such that they overlap each other, and bonding the first surface of the cylinder portion and the second surface of the lid portion to each other by welding. Advantageous Effects of Invention According to the present invention, it is possible to easily achieve a battery with a high energy density. Novel features of the present invention are set forth in the appended claims. However, the configuration and details of the present invention, as well as other objects and features of the present invention, will be further understood with reference to the following detailed description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS FIG. 1A is a schematic diagram showing an example of a method for bonding a lid portion and an opening edge portion in a battery according to an embodiment of the present invention. FIG. 1B is a schematic diagram showing an example of the method for bonding the lid portion and the opening edge portion in the battery according to the embodiment of the present invention. FIG. 1C is a schematic diagram showing an example of the method for bonding the lid portion and the opening edge portion in the battery accordi