KR-20260062608-A - Manufacturing Method of Battery Cell

KR20260062608AKR 20260062608 AKR20260062608 AKR 20260062608AKR-20260062608-A

Abstract

The present disclosure provides a method for manufacturing a battery cell comprising: a storage step of storing an electrode assembly in a storage portion of a case; a first edge sealing step of sealing a first edge extending along a first direction of the case; a depressurization step of depressurizing the interior of the storage portion; a preliminary sealing step of forming a preliminary sealing portion on a storage portion edge adjacent to the storage portion and located between a second edge extending along a second direction perpendicular to the first direction and the storage portion; and an injection step of injecting an electrolyte into the interior of the storage portion; wherein the preliminary sealing step is performed after the depressurization step, and the preliminary sealing portion includes a sealing area and at least one unsealed area.

Inventors

이종혁
서정민
임종찬
한지수

Assignees

에스케이온 주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (13)

A storage step of storing an electrode assembly in the storage portion of a case; A first edge sealing step for sealing a first edge extending along a first direction of the above case; A pressure reduction step for reducing pressure inside the above storage compartment; A preliminary sealing step of forming a preliminary sealing portion on a storage portion edge adjacent to the storage portion, located between a second edge extending along a second direction perpendicular to the first direction and the storage portion; and An injection step of injecting an electrolyte into the interior of the above-mentioned storage unit; Includes, The above preliminary sealing step is performed after the above pressure reduction step, and The above-mentioned preliminary sealing portion is a method for manufacturing a battery cell comprising a sealing area and at least one unsealed area.
In paragraph 1, The above injection step is a method for manufacturing a battery cell in which an electrolyte is injected into the interior of the storage portion through at least one unsealed area.
In paragraph 1, The above depressurization step is, A method for manufacturing a battery cell comprising the steps of: placing a case containing the electrode assembly inside a chamber; and depressurizing the inside of the chamber.
In paragraph 1, A method for manufacturing a battery cell in which the above-mentioned sealing region and the above-mentioned unsealing region are alternately formed along a second direction.
In paragraph 1, A method for manufacturing a battery cell in which the sealing region is continuously extended along a second direction on both sides of the unsealed region.
In paragraph 1, A method for manufacturing a battery cell in which at least one of the above-mentioned unsealed regions has a length of 2 mm or more in the second direction.
In paragraph 1, A method for manufacturing a battery cell in which the total area of the sealing region is greater than or equal to the total area of the unsealed region.
In paragraph 1, Activation step for performing an activation process; A degassing step for discharging gas from inside the above case to the outside; and A finishing sealing step for sealing the above unsealed area; A method for manufacturing a battery cell further comprising
In paragraph 8, A cutting step performed after the above finishing sealing step, in which the rim of the storage section is cut along a cutting line to correspond to the exterior of the battery cell; A method for manufacturing a battery cell further comprising
In paragraph 1, The above case is a method for manufacturing a battery cell in which a gas receiving portion for collecting gas is formed between the rim of the storage portion and the second rim.
In Paragraph 10, A second edge sealing step for sealing the second edge; A method for manufacturing a battery cell further comprising
In Paragraph 11, Activation step for performing an activation process; A degassing step performed after the second edge sealing step above, for discharging gas inside the case to the outside; and A finishing sealing step for sealing the above unsealed area; Includes more, The above degassing step is a method for manufacturing a battery cell in which a gas discharge hole is formed on one surface of a gas receiving portion to discharge the gas collected in the gas receiving portion to the outside.
In Paragraph 12, A battery cell manufacturing method in which the above preliminary sealing step, the above electrolyte injection step, the above second rim sealing step, and the above degassing step are performed in a reduced pressure state inside a chamber.

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. 1 is a front view of a battery cell manufactured by a battery cell manufacturing method according to one embodiment of the present disclosure. FIG. 2 is a flowchart of a battery cell manufacturing method according to one embodiment of the present disclosure. FIGS. 3a to 3j are conceptual diagrams illustrating a battery cell manufacturing method according to an embodiment shown in FIG. 2. FIG. 4 is a flowchart of a battery cell manufacturing method according to another embodiment of the present disclosure. FIGS. 5a to 5h are conceptual diagrams illustrating a battery cell manufacturing method according to another embodiment shown in FIG. 4. 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 rear in the following description are based on the direction depicted in the drawings, and may be expressed differently if the direction of the object changes. Additionally, in this specification and claims, terms including ordinal numbers, such as "first," "second," etc., may be used to distinguish between components. These ordinal numbers are used to distinguish identical or similar components from one another, and the meaning of the terms should not be limited by the use of such ordinal numbers. For example, the order of use or arrangement of components combined with such ordinal numbers should not be limited by the number. If necessary, each ordinal number may be used interchangeably. Hereinafter, the present disclosure will be described in detail with reference to the attached drawings. However, this is merely illustrative and the present disclosure is not limited to the specific embodiments described illustratively. FIG. 1 is a front view of a battery cell (10a) manufactured by the battery cell manufacturing method (S100 of FIG. 2) according to the present disclosure. Referring to FIG. 1, a battery cell (10a) manufactured by the battery cell manufacturing method (S100 of FIG. 2) according to the present disclosure may include an electrode assembly (100 of FIG. 3a), a cell case (120a), and an electrode lead (110). The electrode assembly (100 in FIG. 3a) may include an anode plate, a cathode plate, and a separator. The separator may be placed between the anode plate and the cathode plate. The electrode lead (110) connected to the electrode assembly (100 in FIG. 3a) may be exposed outside the case (120a). The electrode lead (110) may include an anode lead (110a) electrically connected to a plurality of anode plates and a cathode lead (110b) electrically connected to a plurality of cathode plates. The electrode lead (110) may be disposed on each side of the electrode assembly (100 in FIG. 3A). For example, the anode lead (110a) may be disposed on one side of the electrode assembly (100 in FIG. 3A) and the cathode lead (110b) may be disposed on the other side of the electrode assembly (100 in FIG. 3A). However, the placement position and number of electrode leads (110) can be varied. For example, it is possible for both the anode lead (110a) and the cathode lead (110b) to be disposed on one side of the electrode assembly (100 in FIG.