KR-20260065268-A - Manufacturing Method of Battery Cell

KR20260065268AKR 20260065268 AKR20260065268 AKR 20260065268AKR-20260065268-A

Abstract

The present disclosure provides a method for manufacturing a battery cell, comprising: an activation step of performing an activation process on an unfinished battery cell; a placement step of placing the unfinished battery cell inside a chamber in a first pressure state; a storage part pressurizing step in which the case of the unfinished battery cell includes a storage part in which an electrode assembly is housed, and pressurizing at least one side of the storage part; a chamber depressurizing step of depressurizing the interior of the chamber to a second pressure state; and a degassing step of discharging a gas generated in the activation step to the outside of the unfinished battery cell; wherein the second pressure is lower than the first pressure.

Inventors

이종혁
서정민
임종찬
한지수

Assignees

에스케이온 주식회사

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (13)

An activation step for performing an activation process on an incomplete battery cell; A placement step of placing the unfinished battery cell inside a chamber in a first pressure state; The case of the above-mentioned incomplete battery cell includes a storage portion in which an electrode assembly is housed, and a storage portion pressing step of pressing at least one side of the storage portion; A chamber depressurization step for depressurizing the interior of the chamber to a second pressure state; and A degassing step for discharging the gas generated in the above activation step to the outside of the above incomplete battery cell; Includes, A method for manufacturing a battery cell in which the second pressure is lower than the first pressure.
In paragraph 1, The above-mentioned storage unit pressurization step is performed prior to the above-mentioned chamber depressurization step in a method for manufacturing a battery cell.
In paragraph 1, A method for manufacturing a battery cell in which the first pressure is atmospheric pressure.
In paragraph 1, A method for manufacturing a battery cell in which the second pressure is 1 torr or more and 50 torr or less.
In paragraph 1, A method for manufacturing a battery cell in which the pressurizing pressure of the above-mentioned storage portion pressurizing step is 0.1 kgf/ cm² or more and 10 kgf/ cm² or less.
In paragraph 1, A method for manufacturing a battery cell in which the above degassing step is performed while at least one side of the storage portion is pressed.
In paragraph 1, The above case includes a first edge extending along a first direction and a second edge extending along a second direction perpendicular to the first direction, and A storage rim sealing step performed after the above degassing step, which seals a storage rim located between the second rim and the storage rim, adjacent to the storage rim, and extending along the second direction; A method for manufacturing a battery cell further comprising
In Paragraph 7, A cutting step performed after the above-mentioned storage compartment edge sealing step, in which the storage compartment edge is cut along a cutting line to correspond to the exterior of the finished battery cell; A method for manufacturing a battery cell further comprising
In paragraph 1, The above case includes a gas receiving portion that captures gas generated during the activation step, and The above degassing step is a method for manufacturing a battery cell in which the gas captured in the gas receiving portion is discharged to the outside of the unfinished battery cell.
In Paragraph 9, The above degassing step is a method for manufacturing a battery cell that forms a hole on one surface of the gas receiving portion to discharge gas to the outside.
In Paragraph 9, A method for manufacturing a battery cell in which the above-mentioned storage unit pressurization step is performed simultaneously with the above-mentioned chamber depressurization step or after the above-mentioned chamber depressurization step.
In paragraph 1, The above case includes a first edge extending along a first direction and a second edge extending along a second direction perpendicular to the first direction, and The above degassing step is a method for manufacturing a battery cell in which gas inside the above unfinished battery cell passes through the second rim and is discharged to the outside.
In paragraph 1, A method for manufacturing a battery cell in which the above degassing step is performed simultaneously with the above chamber depressurization step.

Description

Manufacturing Method of Battery Cell The present disclosure relates to a method for manufacturing a battery cell capable of charging and discharging. Unlike primary batteries, secondary batteries (battery cells) offer the convenience of being rechargeable, so they are receiving significant attention as a power source for various mobile devices, electric vehicles, and energy storage devices. Secondary batteries can be manufactured as pouch-type or can-type battery cells. Pouch-type battery cells have a structure in which an electrode assembly is housed inside a flexible pouch case. Can-type battery cells have a structure in which an electrode assembly is housed inside a rigid case and can be composed of cylindrical or prismatic battery cells. Pouch-type battery cells are manufactured by housing an electrode assembly inside a battery case, injecting an electrolyte, and then sealing it. FIG. 1a is a front view of an unfinished battery cell being manufactured by a battery cell manufacturing method according to one embodiment of the present disclosure. FIG. 1b is a front view of a finished battery cell manufactured by a battery cell manufacturing method according to one embodiment. FIG. 2 is a flowchart of a battery cell manufacturing method according to one embodiment. FIG. 3a is a conceptual diagram illustrating a batch step in a battery cell manufacturing method according to one embodiment of FIG. 2. FIGS. 3B and FIGS. 3C are conceptual diagrams illustrating the pressurization step of the housing portion in a battery cell manufacturing method according to one embodiment of FIG. 2. FIG. 3d is a conceptual diagram illustrating the degassing step of a battery cell manufacturing method according to one embodiment of FIG. 2. FIG. 4a is a conceptual diagram illustrating the degassing step of a battery cell manufacturing method according to one embodiment of FIG. 2 from a front view. FIG. 4b is a conceptual diagram illustrating, from the front view, the sealing step of the perimeter of the storage portion in a battery cell manufacturing method according to one embodiment of FIG. 2. FIG. 4c is a conceptual diagram illustrating the cutting step of a battery cell manufacturing method according to one embodiment of FIG. 2 from a front view. FIG. 5 is a photograph of a finished battery cell manufactured by a battery cell manufacturing method according to one embodiment of the present disclosure. FIG. 6 is a photograph of a battery cell according to a comparative example manufactured by omitting the pressurization step of the housing portion in the battery cell manufacturing method according to one embodiment of the present disclosure. FIG. 7 is a front view of an unfinished battery cell being manufactured by a battery cell manufacturing method according to another embodiment of the present disclosure. FIG. 8 is a flowchart of a battery cell manufacturing method according to another embodiment. FIG. 9a is a conceptual diagram illustrating a batch step in a battery cell manufacturing method according to another embodiment of FIG. 8. FIGS. 9b and 9c are conceptual diagrams illustrating the pressurization step of the housing portion in a battery cell manufacturing method according to another embodiment of FIG. 8. FIG. 9d is a conceptual diagram illustrating the degassing step of a battery cell manufacturing method according to another embodiment of FIG. 8. FIG. 10a is a conceptual diagram showing the degassing step of a battery cell manufacturing method according to another embodiment of FIG. 8 from a front view. FIG. 10b is a conceptual diagram illustrating, from the front view, the sealing step of the perimeter of the storage portion in a battery cell manufacturing method according to another embodiment of FIG. 8. FIG. 10c is a conceptual diagram showing the cutting step of a battery cell manufacturing method according to another embodiment of FIG. 8 from a front view. Identical reference numbers or symbols in each drawing attached to this specification represent parts or components that perform substantially the same function. For convenience of explanation and understanding, the same reference numbers or symbols may be used to describe different embodiments. That is, even if components having the same reference number are depicted in multiple drawings, the multiple drawings do not all represent a single embodiment. In the following description, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "comprising" or "constituting" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. In addition, it should be noted in advance that expressions such as upper side, top, lower side, bottom, side, front, and