US-12627009-B2 - Secondary battery

US12627009B2US 12627009 B2US12627009 B2US 12627009B2US-12627009-B2

Abstract

A secondary battery includes a bare cell including an electrode assembly, an electrode tab drawn upwardly from the electrode assembly, and a pouch surrounding the electrode assembly, the electrode tab being exposed to an outside through the pouch, a protection circuit module (PCM) connected to the electrode tab, a case holder disposed between the pouch and the PCM to support the PCM, a case top on the bare cell, the PCM and the case holder being covered by the case top, a case bottom at a bottom side of the bare cell, and a plate attached to a side surface of the bare cell, the plate being coupled to the case top and the case bottom.

Inventors

Moo Ryong BAEK

Assignees

SAMSUNG SDI CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20221227
Priority Date: 20211230

Claims (15)

1 . A secondary battery, comprising: a bare cell including an electrode assembly, an electrode tab drawn upwardly from the electrode assembly, and a pouch surrounding the electrode assembly, the electrode tab being exposed to an outside through the pouch; a protection circuit module (PCM) connected to the electrode tab; a case holder between the pouch and the PCM to support the PCM, the case holder extending along a width of the bare cell, and the case holder having an avoidance portion recessed at a lower corner of the case holder; a case top on the bare cell, the PCM and the case holder being covered by the case top; a case bottom at a bottom side of the bare cell; and a plate attached to a side surface of the bare cell, the plate being coupled to the case top and the case bottom, wherein the case holder has a structure of a frame surrounding a hollow interior, a portion of the case holder separating the hollow interior from the PCM being a portion of the frame, wherein the frame includes two long sides parallel to each other and to a major surface of the PCM, the two long sides being separated from each other by the hollow interior, and one of the two long sides separating the hollow interior from the PCM, and wherein the avoidance portion connects ends of the two long sides of the frame, the avoidance portion having a triangular shape.
2 . The secondary battery as claimed in claim 1 , wherein the pouch includes a terrace portion overlapping at a top of the electrode assembly, the case holder being on the terrace portion.
3 . The secondary battery as claimed in claim 1 , wherein the case holder includes ribs crossing the hollow frame.
4 . The secondary battery as claimed in claim 1 , wherein the case holder includes a protrusion protruding upwardly from an upper surface of the case holder facing the PCM, the protrusion being in contact with the PCM.
5 . The secondary battery as claimed in claim 1 , wherein the electrode tab extends upwardly beyond the pouch and is bent between the PCM and the case holder.
6 . The secondary battery as claimed in claim 1 , further comprising an adhesion member on a side surface of the bare cell, the plate being attached to the side surface of the bare cell by the adhesion member.
7 . The secondary battery as claimed in claim 1 , wherein the case top includes any one of a projecting part and a groove, and the plate has the other one of the projecting part and the groove, the projecting part being inserted into the groove.
8 . The secondary battery as claimed in claim 1 , wherein the case bottom has any one of a projecting part and a groove, and the plate has the other one of the projecting part and the groove, the projecting part being inserted into the groove.
9 . A secondary battery, comprising: a bare cell including an electrode assembly, an electrode tab drawn upwardly from the electrode assembly, and a pouch surrounding the electrode assembly, the electrode tab being exposed to an outside through the pouch; a protection circuit module (PCM) connected to the electrode tab; a case holder between the pouch and the PCM to support the PCM, the case holder including a hollow interior, a portion of the case holder separating the hollow interior from the PCM and supporting the PCM; a case top on the bare cell, the PCM and the case holder being covered by the case top; a case bottom at a bottom side of the bare cell; and a plate attached to a side surface of the bare cell, the plate being coupled to the case top and the case bottom wherein the case holder has a structure of a frame surrounding the hollow interior, the portion of the case holder separating the hollow interior from the PCM being a portion of the frame, wherein the frame includes two long sides parallel to each other and to a major surface of the PCM, the two long sides being separated from each other by the hollow interior, and one of the two long sides separating the hollow interior from the PCM, and wherein the case holder includes ribs extending through the hollow interior between the two long sides, the ribs being spaced apart from each other and perpendicular to the two long sides of the frame.
10 . The secondary battery as claimed in claim 9 , wherein the case holder includes ribs extending through the hollow interior of the frame.
11 . The secondary battery as claimed in claim 9 , wherein the frame further includes an avoidance portion connecting ends of the two long sides of the frame, the avoidance portion having a triangular shape.
12 . The secondary battery as claimed in claim 11 , wherein the triangular shape is oriented with a sharp end pointing away from the hollow interior.
13 . The secondary battery as claimed in claim 9 , wherein the portion of the case holder separates an entire bottom surface of the PCM from the hollow interior, the PCM being directly on the portion of the case holder.
14 . The secondary battery as claimed in claim 9 , wherein the PCM is directly on an upper portion of the case holder, the hollow interior being between the upper portion of the case holder and a lower portion of the case holder.
15 . The secondary battery as claimed in claim 14 , wherein the case holder includes a protrusion protruding upwardly from the upper portion of the case holder toward the PCM, the protrusion being perpendicular to the upper portion of the case holder and contacting the PCM.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to and the benefit of Korean Patent Application No. 10-2021-0192762, filed on Dec. 30, 2021, in the Korean Intellectual Property Office, the contents of which in its entirety are herein incorporated by reference. BACKGROUND 1. Field An embodiment of the present disclosure relates to a secondary battery. 2. Description of the Related Art Unlike a primary battery that cannot be charged, a secondary battery is a battery that can be charged and discharged. Low-capacity secondary batteries may be used in portable small electronic devices, e.g., mobile phones and camcorders, and large-capacity secondary batteries may be used as power sources for driving motors, e.g., in hybrid and electric vehicles. The secondary batteries may be classified into, e.g., a cylindrical shape, a prismatic shape, a pouch type, and the like, according to their external shape. Among those batteries, a pouch type secondary battery, which wraps an electrode assembly by using a pouch, is advantageous in view of its high energy density and space utilization, but may be relatively vulnerable to external impact. SUMMARY A secondary battery according to an embodiment of the present disclosure may include a bare cell including an electrode assembly, an electrode tab drawn upwardly from the electrode assembly, and a pouch surrounding the electrode assembly so as to allow the electrode tab to be exposed to the outside; a PCM connected to the electrode tab; a case holder disposed between the pouch and the PCM to support the PCM; a case top installed to receive the PCM and the case holder; a case bottom disposed at a lower side of the bare cell; and a plate attached to a side surface of the bare cell and coupled to the case top and the case bottom. In addition, by including a first pouch member surrounding one side of the electrode assembly and a second pouch member surrounding the opposite side of the electrode assembly, the pouch has a terrace portion to which the first pouch member and the second pouch member are bonded along the circumference thereof, and the case holder may be disposed on the terrace portion. In addition, the case holder may extend over the entire width of the bare cell, and an avoidance portion may be formed in which left and right lower corners are partially deleted or recessed. In addition, the case holder may be formed in the structure of a hollow. In addition, the case holder may have ribs formed to cross the hollow. In addition, the case holder may have a protrusion upwardly protruding from an upper surface facing the PCM and being in contact with the PCM. In addition, the electrode tab may extend upward beyond the pouch and be bent between the PCM and the case holder. In addition, the secondary battery may further include an adhesion member disposed on the side surface of the bare cell, and the plate may be attached to the side surface of the bare cell by means of the adhesion member. In addition, the case top may have any one of a projecting part and a groove or hole, and the plate may have the other one of the projecting part and the groove and the hole, and thus the projecting part can be inserted into the groove or hole. In addition, the case bottom may have any one of a projecting part and a groove or hole, and the plate may have the other one of the projecting part and the groove or hole, and thus the projecting part can be inserted into the groove or hole. BRIEF DESCRIPTION OF DRAWINGS Features will become apparent to those of skill in the art by describing in detail exemplary embodiments with reference to the attached drawings, in which: FIG. 1 is an exploded view illustrating a secondary battery according to an embodiment of the present disclosure. FIGS. 2 to 11 illustrate stages in a process of assembling a secondary battery according to an embodiment of the present disclosure. DETAILED DESCRIPTION Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, they may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey exemplary implementations to those skilled in the art. In the drawing figures, the dimensions of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when a layer or element is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. In addition, it will also be understood that when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present. Like reference numerals refer to like elements throughout. As used herein, the term “and/or” includes any and all combinations of