CN-115621558-B - Secondary battery

CN115621558BCN 115621558 BCN115621558 BCN 115621558BCN-115621558-B

Abstract

Disclosed is a secondary battery. The secondary battery includes an electrode assembly including a first electrode plate, a second electrode plate, and a separator, a case including a first side having an opening for accommodating the electrode assembly, a cap plate sealing the first side of the case, a first current collector plate disposed between the electrode assembly and the cap plate, a conductive paste electrically connecting the case and the first current collector plate while physically fixing the case and the first current collector plate, a terminal disposed on the second side of the case, and a second current collector plate electrically connecting the second electrode plate and the terminal.

Inventors

CAO SHENGFENG
LI ZHENGYU

Assignees

三星SDI株式会社

Dates

Publication Date: 20260512
Application Date: 20220629
Priority Date: 20210630

Claims (8)

1. A secondary battery, the secondary battery comprising: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; A case including a first side having an opening for accommodating the electrode assembly; a cover plate sealing the first side of the housing; A first current collector plate disposed between the electrode assembly and the cap plate; a conductive paste electrically connecting the case and the first current collector plate while physically fixing the case and the first current collector plate; a terminal arranged on the second side of the housing, and And a second current collector plate electrically connecting the second electrode plate and the terminal.
2. The secondary battery according to claim 1, wherein the conductive paste is located at a region corresponding to a boundary between an inner peripheral surface of the case and an edge of the first current collector plate.
3. The secondary battery according to claim 1, wherein the conductive paste is located between the cap plate and the first current collector plate.
4. The secondary battery according to claim 1, wherein the cap plate includes a receiving portion that provides a space in which the conductive paste is located.
5. The secondary battery according to claim 4, wherein the receiving portion is formed by bending an edge of the cap plate away from the first current collector plate.
6. The secondary battery according to claim 1, wherein the first current collector plate includes a first region in contact with the first electrode plate and a second region in contact with the cap plate, and the first current collector plate is elastically deformably bent such that the first region has a height difference with respect to the second region.
7. The secondary battery according to claim 1, wherein the cap plate has an electrolyte injection hole formed therein.
8. The secondary battery according to claim 1, wherein the case includes a bent portion, and the secondary battery further includes a gasket between the bent portion and the cap plate.

Description

Secondary battery Technical Field Aspects of embodiments of the present disclosure relate to a secondary battery. Background Unlike a primary battery that is not rechargeable, a secondary battery can be charged and discharged. Low-capacity secondary batteries are widely used in small-sized portable electronic devices such as smart phones, function phones, tablet computers, notebook computers, digital cameras, video cameras, etc., while large-capacity secondary batteries are generally used to drive motors of hybrid vehicles, electric vehicles, etc. The secondary battery may include an electrode assembly including a positive electrode and a negative electrode, a case or can accommodating the electrode assembly, terminals connected to the electrode assembly, and other assemblies. The secondary batteries may be classified into a cylindrical type, a prismatic type, and a pouch type according to shapes. The above information disclosed in this background section is provided for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art. Disclosure of Invention According to aspects of embodiments of the present disclosure, a secondary battery having increased sealing strength and improved safety is provided. A secondary battery according to one or more embodiments of the present disclosure may include an electrode assembly including a first electrode plate, a second electrode plate, and a separator, a case including a first side having an opening to accommodate the electrode assembly, a cap plate sealing the first side of the case, a first current collector plate disposed between the electrode assembly and the cap plate, a conductive paste electrically connecting the case and the first current collector plate while physically fixing the case and the first current collector plate, a terminal disposed on the second side of the case, and a second current collector plate electrically connecting the second electrode plate and the terminal. In one or more embodiments, the conductive paste may be located at an area corresponding to a boundary between an inner circumferential surface of the case and an edge of the first current collector plate. In one or more embodiments, the conductive paste may be located between the cover plate and the first current collector plate. In one or more embodiments, the cover plate may include a receiving portion providing a space in which the conductive paste is located. In one or more embodiments, the receiving portion may be formed by bending an edge of the cover plate away from the first current collector plate. In one or more embodiments, the first current collector plate may include a first region in contact with the first electrode plate and a second region in contact with the cap plate, and the first current collector plate is elastically deformably bent such that the first region has a height difference with respect to the second region. In one or more embodiments, the cap plate may have an electrolyte injection hole formed therein. In one or more embodiments, the case includes a bent portion, and the secondary battery further includes a gasket between the bent portion and the cap plate. Drawings Fig. 1 is a schematic cross-sectional view of a secondary battery according to an embodiment of the present disclosure. Fig. 2 is an enlarged view of the area "a" in fig. 1. Fig. 3 is a perspective view of a first current collector plate of a secondary battery according to an embodiment of the present disclosure. Detailed Description Some embodiments of the present disclosure will be described in more detail herein with reference to the accompanying drawings. Embodiments of the present disclosure are provided to more fully explain the present disclosure and the following embodiments may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will convey the aspects and features of the disclosure to those skilled in the art. In addition, in the drawings, the size or thickness of various components may be exaggerated for brevity and clarity. Like numbers refer to like elements throughout. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. In addition, it will be understood that when element a is referred to as being "connected to" element B, element a may be directly connected to element B, or one or more intervening elements C may be present between element a and element B such that element a and element B are indirectly connected to each other. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular is intended to include the plural unless the context clearly indicates otherwise