KR-20260068123-A - BATTERY CELL, MANUFACTURING METHOD AND MANUFACTURING SYSTEM THEREFOR, BATTERY AND ELECTRIC DEVICE

KR20260068123AKR 20260068123 AKR20260068123 AKR 20260068123AKR-20260068123-A

Abstract

The present application provides a battery cell and a method for manufacturing the same, a manufacturing system, a battery, and an electric device. A battery cell according to an embodiment of the present application comprises: a housing having an opening and a pressure reduction mechanism that operates to release internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a critical value; an electrode assembly received in the housing and comprising a body portion and a tab portion protruding from the body portion; and a cover assembly for covering and joining the opening, wherein a first recess is formed on one side facing the electrode assembly and abutting the body portion, in which at least a portion of the tab portion is received. The cover assembly is provided with at least one first passage, and the first passage communicates the space between the electrode assembly and the housing with the first recess to guide gas inside the first recess into the space between the electrode assembly and the housing and to act on the pressure reduction mechanism. The first passage can reduce the risk of safety accidents by reducing the gas accumulated between the electrode assembly and the cover assembly.

Inventors

푸 위지에

Assignees

컨템포러리 엠퍼렉스 테크놀로지 (홍콩) 리미티드

Dates

Publication Date: 20260513
Application Date: 20210623

Claims (15)

In battery cells, A housing comprising a bottom plate and a side plate, wherein the bottom plate is located on one side of a body portion away from a cover assembly, the side plate is connected to the bottom plate and an end cap, and a pressure reducing mechanism is disposed on the bottom plate to release internal pressure or temperature when the internal pressure or temperature of a battery cell reaches a critical value, and the housing is provided with an opening; An electrode assembly accommodated in the above housing and comprising a body portion and a tab portion protruding from the body portion; and A cover assembly for covering and joining the above-mentioned opening, comprising a first recess formed on one side facing the body portion and opposite the electrode assembly, wherein at least a portion of the tab portion is received therein. The above cover assembly is provided with at least one first passage, and the first passage communicates the space between the electrode assembly and the housing with the first recess to guide gas inside the first recess into the space between the electrode assembly and the housing and to act on the pressure reduction mechanism. The cover assembly includes two first protrusions protruding from the lower wall of the first concave portion, and in a first direction, the first concave portion is located between the two first protrusions, and The first protrusion above contacts the body part, and A battery cell having, in the first direction, at least one first protrusion having at least one first passage that penetrates the first protrusion along the first direction and communicates with the space between the electrode assembly and the housing.
In Article 1, A battery cell having at least one second concave portion formed on one side of the first protrusion moving away from the body portion, wherein the second concave portion forms at least a part of the first passage.
In Article 1, The above first passage comprises a first through hole and/or a first groove, a battery cell.
In Article 1, The cover assembly further includes a second protrusion that protrudes from the lower wall of the first concave portion, contacts the body portion, and is located between the two first protrusions. A battery cell comprising a first portion and a second portion, each located on both sides of the second protrusion along the first direction, wherein the first portion is a first portion and a second portion, respectively.
In Paragraph 4, A battery cell having a second passage in which the first part and the second part are connected at the second protrusion.
In Article 1, The cover assembly further includes two third protrusions protruding from the lower wall of the first concave portion, and in a second direction perpendicular to the first direction, the first concave portion is located between the two third protrusions. A battery cell in which the third protrusion abuts the body part, and both ends of the third protrusion are each connected to the two second protrusions.
In Article 1, The electrode assembly is a wound or laminated structure comprising a cathode plate, an anode plate, and a separator that isolates the cathode plate and the anode plate, and A battery cell wherein the outer surface of the electrode assembly comprises two wide surfaces and two narrow surfaces, wherein the area of the wide surfaces is larger than the area of the narrow surfaces, the two wide surfaces are arranged opposite each other along a second direction, and the two narrow surfaces are arranged opposite each other along a first direction perpendicular to the second direction.
In Article 7, A battery cell having a first gap between the narrow surface and the housing, a second gap between the wide surface and the housing, wherein the size of the first gap is larger than the size of the second gap.
In Article 8, A battery cell in which the first passage above connects the first gap and the first concave portion.
In any one of paragraphs 1 through 9, A battery cell comprising: an end cap that covers and joins the opening of the cover assembly; and an insulating member located on one side of the end cap facing the body portion, in contact with the body portion, and having the first concave portion formed on the side facing the body portion.
In Article 10, It further includes an insulating film that covers and wraps the body portion and isolates the body portion from the housing so as to be electrically insulated, wherein the end facing the end cap surrounds the outer side of the insulating member and is connected to the insulating member. A battery cell having a second through hole disposed opposite to the first passage so as to be in communication with the first passage in the insulating film.
A battery comprising a battery cell according to any one of claims 1 to 9.
An electric device comprising a battery according to Article 12 for providing electric energy.
A step of providing a housing comprising a bottom plate and a side plate, wherein the bottom plate is located on one side of a body portion away from a cover assembly, the side plate is connected to the bottom plate and an end cap, and a pressure reducing mechanism is disposed on the bottom plate and an opening is provided; A step of providing an electrode assembly comprising a body portion and a tab portion protruding from the body portion; A step of providing a cover assembly having a first concave portion formed on one side; The step of connecting the above cover assembly to the above electrode assembly; and The method includes the step of placing the electrode assembly into the housing and joining the cover assembly to cover the opening; The cover assembly is formed with a first recess on one side facing the body portion and facing the electrode assembly, in which at least a portion of the tab portion is received; the cover assembly is provided with at least one first passage that communicates the space between the electrode assembly and the housing with the first recess, thereby guiding gas inside the first recess into the space between the electrode assembly and the housing and acting on the pressure reduction mechanism; the pressure reduction mechanism operates when the internal pressure or temperature of the battery cell reaches a critical value to release the internal pressure or temperature. The cover assembly includes two first protrusions protruding from the lower wall of the first concave portion, and in a first direction, the first concave portion is located between the two first protrusions, and The first protrusion above contacts the body part, and A method for manufacturing a battery cell, wherein, in the first direction, at least one first protrusion is provided with at least one first passage that penetrates the first protrusion along the first direction and communicates with the space between the electrode assembly and the housing.
A first providing device comprising a bottom plate and a side plate, wherein the bottom plate is located on one side of a body portion away from a cover assembly, the side plate is connected to the bottom plate and an end cap, and a housing having a pressure reducing mechanism disposed on the bottom plate and an opening provided therein; A second providing device for providing an electrode assembly including a body portion and a tab portion protruding from the body portion; A third providing device that provides a cover assembly having a first concave portion formed on one side; A first assembly device for connecting the above cover assembly to the above electrode assembly; and A second assembly device comprising inserting the electrode assembly into the housing and joining the cover assembly by covering the opening; The cover assembly is formed with a first recess on one side facing the body portion and facing the electrode assembly, in which at least a portion of the tab portion is received; the cover assembly is provided with at least one first passage that communicates the space between the electrode assembly and the housing with the first recess, thereby guiding gas inside the first recess into the space between the electrode assembly and the housing and acting on the pressure reduction mechanism; the pressure reduction mechanism operates when the internal pressure or temperature of the battery cell reaches a critical value to release the internal pressure or temperature. The cover assembly includes two first protrusions protruding from the lower wall of the first concave portion, and in a first direction, the first concave portion is located between the two first protrusions, and The first protrusion above contacts the body part, and A battery cell manufacturing system, wherein, in the first direction, at least one first protrusion is provided with at least one first passage that penetrates the first protrusion along the first direction and communicates with the space between the electrode assembly and the housing.

Description

Battery cell and its manufacturing method, manufacturing system, battery and electric device The present application relates to the field of battery technology, and more specifically, to a battery cell and a method for manufacturing the same, a manufacturing system, a battery, and an electric device. Battery cells are widely used in electronic devices such as mobile phones, laptops, electric bicycles, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools. Battery cells may include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, and alkali zinc-manganese secondary battery cells. In the advancement of battery technology, safety issues are an undeniable concern alongside the improvement of battery cell performance. If the safety of a battery cell cannot be guaranteed, it becomes unusable. Therefore, determining how to enhance battery safety is an urgent technical challenge that must be addressed in battery technology. In order to more clearly explain the technical solution according to the embodiments of the present application, we will briefly introduce the accompanying drawings that should be referenced when describing the embodiments of the present application. However, the following accompanying drawings are merely some embodiments of the present application, and it is obvious that a person skilled in the art can derive other drawings from these drawings without creative effort. FIG. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application. FIG. 2 is a schematic exploded view of a battery according to some embodiments of the present application. Figure 3 is a schematic structural diagram of the battery module shown in Figure 2. FIG. 4 is a schematic exploded view of a battery cell according to some embodiments of the present application. FIG. 5 is a schematic structural diagram of an electrode assembly of a battery cell according to some embodiments of the present application. FIG. 6 is a schematic structural diagram of an electrode assembly of a battery cell according to another embodiment of the present application. FIG. 7 is a schematic cross-sectional view of a battery cell according to some embodiments of the present application. Figure 8 is an enlarged schematic diagram of a battery cell in circular A shown in Figure 7. FIG. 9 is a schematic structural diagram of an insulating member of an end cap assembly of a battery cell according to some embodiments of the present application. FIG. 10 is a schematic structural diagram of an insulating member of an end cap assembly of a battery cell according to another embodiment of the present application. FIG. 11 is another schematic cross-sectional view of a battery cell according to some embodiments of the present application. FIG. 12 is a schematic cross-sectional view of a battery cell according to another embodiment of the present application. Figure 13 is an enlarged schematic diagram of a battery cell in circular B shown in Figure 12. FIG. 14 is a schematic flowchart of a method for manufacturing a battery cell according to some embodiments of the present application. FIG. 15 is a schematic block diagram of a manufacturing system for a battery cell according to some embodiments of the present application. In the attached drawing, the size is not drawn according to the actual scale. Hereinafter, in order to clarify the purpose, technical solution, and advantages of the embodiments of the present application, the technical solution according to the embodiments of the present application will be clearly described with reference to the attached drawings. Of course, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments of the present application, all other embodiments obtained by a person skilled in the art without creative effort will fall within the scope of protection of the present application. All technical and scientific terms used in this application, unless otherwise defined, have the meaning generally understood by those skilled in the art to which this application pertains. Terms used in the specification of this application are merely for describing specific embodiments and are not intended to limit this application. Furthermore, the terms “comprising” and “having,” and any variations thereof, in the specification, claims, and brief description of the drawings of this application are intended to encompass non-exclusive inclusions. Terms such as “first,” “second,” etc., in the specification and claims of this application or in the drawings described above are used to distinguish different objects and are not intended to describe a specific order or master-servant relationship. The term "Examples" as used in this application means that specific features, structures, or characteristics described in connection wi