KR-102962588-B1 - FRAME STRUCTURE FOR POUCH-TYPE BATTERY AND SECONDARY BATTERY INCLUDING SAME

KR102962588B1KR 102962588 B1KR102962588 B1KR 102962588B1KR-102962588-B1

Abstract

The present invention relates to a frame structure for a pouch-type battery, comprising: a frame having a rim shape with a hollow space for accommodating an electrode assembly in the center; and a fixing member for fixing the electrode assembly accommodated in the hollow space to the frame.

Inventors

권명빈

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20210929

Claims (10)

A frame with a rim shape having a hollow in the center for accommodating an electrode assembly; and A fixing member for fixing the electrode assembly accommodated in the above hollow to the frame; comprising The above fixing member is a means for fixing the electrode assembly and the frame by simultaneously winding them in a direction perpendicular to the longitudinal direction of the frame, Frame structure for pouch-type batteries.
In Article 1, The above frame is A structure including an internal stopper that protrudes from the rim toward the hollow and supports the received electrode assembly. Frame structure for pouch-type batteries.
In Article 1, The above frame is A first groove for fitting an electrode tab on both edges perpendicular to the longitudinal direction so that the electrode tab of the above electrode assembly is exposed to the outside, Frame structure for pouch-type batteries.
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In Article 1, In the case where two or more of the above-mentioned fixing members are included, Winding the above-mentioned fixed members symmetrically to the left and right with respect to the 1/2 point in the longitudinal direction of the frame, Frame structure for pouch-type batteries.
In Article 1, The above frame is A second groove for fitting the fixing member into both edges parallel to the longitudinal direction so as to be fixed in close contact with the frame and the electrode assembly, Frame structure for pouch-type batteries.
In Article 6, The above second groove is Symmetrically positioned on both edges parallel to the longitudinal direction of the above frame, Positioned symmetrically to the left and right with respect to the halfway point of the above frame, Frame structure for pouch-type batteries.
In Article 1, The above-mentioned frame structure for a pouch-type battery is A cover frame further comprising covering at least one of the upper and lower surfaces of the above-mentioned electrode assembly, Frame structure for pouch-type batteries.
In Article 1, The above frame includes an insulating material, Frame structure for pouch-type batteries.
Electrode assembly; A frame structure for a pouch-type battery according to any one of claims 1 to 3 and claims 5 to 9; and A pouch case accommodating the electrode assembly and the frame structure for the pouch-type battery; comprising Secondary battery.

Description

Frame structure for pouch-type battery and secondary battery including the same The present invention relates to a frame structure for a pouch-type battery and a secondary battery including the same. As the range of applications for secondary batteries gradually expands from small electronic devices to medium-to-large electric vehicles and energy storage systems, research and development on lithium secondary batteries is continuing with the goals of high capacity, high energy density, and long lifespan. The above secondary battery can be manufactured in various ways depending on its shape, and can be typically classified into cylindrical, prismatic, and pouch types based on its shape. Among these, the pouch-type secondary battery is manufactured by having a plate-shaped battery cell structure in which positive and negative leads are formed at the ends, and by housing an electrode assembly consisting of a positive electrode, a negative electrode, and a separator placed between them inside a pouch case, adding an electrolyte, and sealing it by applying vacuum pressure. The pouch-type secondary battery can primarily be used in the form of a stack cell structure in which multiple unit cells are stacked according to the output capacity required by each device. Unlike cylindrical or prismatic batteries that use thick metal materials, the above pouch-type secondary battery can be freely bent, making it easy to modify its shape according to the product, resulting in excellent space efficiency. It also has the advantage of having a large charging capacity due to high energy density per unit area, despite having a small weight and volume and economical manufacturing costs. However, while the aforementioned pouch-type secondary battery has the advantage of being able to flexibly change its shape through free bending, it is pointed out as a disadvantage that it is vulnerable to external impact or pressure, making it prone to electrode damage. Additionally, there is a possibility of dimensional defects occurring during the stacking process due to the material characteristics of the separator within the pouch and the stacking tolerances that occur when stacking the separator and the electrode. Specifically, during the alignment process, the separator is difficult to use as an alignment reference due to its soft material properties, and the electrode may be obscured by the previously stacked separator. Furthermore, dimensional changes in the electrode assembly caused by the stacking tolerances between the separator and the electrode make it prone to errors even when used as an alignment reference, leading to the problem of dimensional defects. To solve the above problem, a case was proposed in which a housing is formed by assembling two or more frames that protect a cell stack; however, it was pointed out that there is a problem in that it cannot flexibly respond to swelling phenomena or cases where the overall thickness of the stack cell increases significantly due to a large number of electrodes stacked, as the number of components is large, assembly is complex, and the standardized shape. Therefore, there is a need for research and development on devices or improvement methods that can prevent electrode damage even when external pressure is applied to the stack cells of pouch-type batteries and prevent dimensional defects caused by electrode stacking tolerances, thereby improving the stability and production yield of pouch-type batteries. Figure 1 illustrates a conventional stacking process prior to the application of a frame structure. Figure 2 schematically illustrates the stacking process of the present invention with a frame structure applied. FIG. 3 shows (a) a perspective view and (b) a plan view of one embodiment of the frame structure of the present invention. FIG. 4 shows (a) a perspective view and (b) a plan view of one embodiment of the frame structure of the present invention. FIG. 5 shows (a) a perspective view, (b) a plan view, and (c) a usage example of one embodiment of the frame structure of the present invention. Preferred embodiments are provided to aid in understanding the present invention, but the following embodiments are provided only to facilitate a better understanding of the invention and do not limit the invention thereto. Furthermore, the size or shape of components depicted in the drawings may be exaggerated for clarity and convenience of explanation, and terms specifically defined in consideration of the configuration and operation of the present invention may vary according to the intent or convention of the user or operator, and the definitions of such terms must be based on the content throughout this specification. The present invention will be described in detail below with reference to the attached drawings. It has been pointed out as a limitation in the manufacturing of conventional pouch-type batteries that the electrode assembly is vulnerable to external impact and highly suscept