KR-20260066647-A - Battery cell, battery pack and vehicle including the same

KR20260066647AKR 20260066647 AKR20260066647 AKR 20260066647AKR-20260066647-A

Abstract

A battery cell according to the present invention comprises: an electrode assembly provided by being wound around a winding axis with a separator interposed between electrodes; a cell housing that accommodates the electrode assembly; a terminal disposed on one side of the cell housing and having an exposed portion exposed to the outside of the cell housing and an insertion portion into which at least a portion is inserted into the interior of the cell housing, and electrically connected to the electrode assembly; a ring gasket disposed outside the cell housing and supporting the terminal; and a first support member disposed inside the cell housing, supporting the terminal, and spaced apart from the ring gasket.

Inventors

채상학
김정진
박종훈

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260512
Application Date: 20251104
Priority Date: 20241104

Claims (16)

An electrode assembly provided by being wound around a winding axis with a separator interposed between the electrodes; A cell housing that accommodates the above electrode assembly; A terminal disposed on one side of the cell housing and having an exposed portion exposed to the outside of the cell housing and an inserted portion in which at least a portion is inserted into the interior of the cell housing, and electrically connected to the electrode assembly; A ring gasket disposed outside the cell housing and supporting the terminal; and A battery cell characterized by including a first support member disposed inside the cell housing, supporting the terminal, and spaced apart from the ring gasket.
In paragraph 1, On one side of the cell housing, A first hollow hole is formed through which the above-mentioned insert can pass, and A battery cell characterized in that, when the insertion part is inserted into the first hollow hole, a void space is formed between the inner circumference of the first hollow hole and the outer circumference of the insertion part.
In paragraph 1, The above ring gasket and the above first support member are, A battery cell characterized by being fixedly positioned in the cell housing.
In paragraph 1, Each of the above ring gasket and the above first support member, A second hollow hole and a third hollow hole are formed through which the above-mentioned insert can pass, and The inner diameter of the second hollow hole and the inner diameter of the third hollow hole before the insertion part is penetrated are, A battery cell characterized by being formed smaller than the inner diameter of the second hollow hole and the inner diameter of the third hollow hole in the state where the insertion part is penetrated.
In paragraph 1, The above insert is, A battery cell characterized by being formed such that the diameter decreases as it approaches the electrode assembly.
In paragraph 1, The first support member above is, A battery cell characterized by having elasticity.
In paragraph 1, The first support member above is, A battery cell characterized by being configured to expand when an electrolyte is absorbed.
In paragraph 1, The first support member above is, A battery cell characterized by having insulating properties.
In paragraph 1, The outer diameter of the above ring gasket is, A battery cell characterized by not being smaller than the outer diameter of the exposed portion.
In paragraph 1, The outer diameter of the first support member is, A battery cell characterized by not being smaller than the outer diameter of the electrode assembly.
In Paragraph 10, The above-mentioned first support member is, A battery cell characterized by extending to the inner surface of the cell housing.
In paragraph 1, A battery cell characterized by further including a second support member disposed inside the cell housing on the opposite side of the first support member and supporting the electrode assembly.
In Paragraph 12, The cell housing above is, It has a beading portion formed by being indented inward, and The above second support member is, A battery cell characterized by being disposed on the inner side of the innermost part of the above-mentioned beading portion.
In Paragraph 12, The cell housing above is, It has a beading portion formed by being indented inward, and The above second support member is, A battery cell characterized by being disposed between the upper part of the beading portion and the lower part of the electrode assembly.
A battery pack characterized by including at least one battery cell according to any one of claims 1 to 14.
An automobile characterized by including at least one battery pack according to paragraph 15.

Description

Battery cell, battery pack and vehicle including the same The present invention relates to a battery cell, a battery pack, and a vehicle including the same, and more specifically, to a battery cell, a battery pack, and a vehicle including the same with improved safety and quality. Recently, as the demand for portable electronic products such as laptops, video cameras, and mobile phones has increased rapidly, and the development of electric vehicles, energy storage batteries, robots, and satellites has accelerated, research on high-performance secondary batteries capable of repeated charging and discharging is actively underway. Currently commercialized rechargeable batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to freely charge and discharge with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density. These lithium-ion secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. Additionally, the lithium-ion secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing that seals and encloses the electrode assembly together with an electrolyte. Lithium-ion rechargeable batteries can be classified according to the shape of the battery case into pouch-type rechargeable batteries, in which the electrode assembly is embedded in a pouch made of aluminum laminate sheets, and can-type rechargeable batteries, in which the electrode assembly is embedded in a metal can. Furthermore, can-type rechargeable batteries can be further classified into cylindrical batteries and prismatic batteries depending on the shape of the metal can. These lithium-ion rechargeable batteries are utilized as battery modules or battery packs, which are assembled into a dense structure by overlapping or stacking multiple battery cells—either directly or mounted in cartridges—and then electrically connected to provide high voltage and high current. Meanwhile, conventional cylindrical secondary batteries included a terminal provided in the form of a rivet on one side of a cell housing that accommodates an electrode assembly, and a gasket provided in a form that surrounds the terminal to insulate the terminal from the cell housing. In such conventional cylindrical secondary batteries, the gasket surrounding the terminal could melt when heat was applied to the terminal and its surroundings, such as when welding the terminal. In this case, the terminal could come into contact with an adjacent part of the cell housing having a different polarity, increasing the likelihood of a short circuit and significantly reducing the safety of the secondary battery. In addition, conventional cylindrical secondary batteries could experience pressure variations depending on the location due to swelling of the negative electrode and sliding of the positive and negative electrodes. Furthermore, the pressure in the area where the positive and negative electrodes slide could be lower than that on the winding axis side. Due to these pressure variations, differences in the distribution of the electrolyte amount could occur, resulting in a black band phenomenon at the end of the separator, which could lead to a decrease in the quality of the battery cell. The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a perspective view showing the overall external appearance of a battery cell according to one embodiment of the present invention. FIG. 2 is a side cross-sectional view showing the interior of a battery cell according to one embodiment of the present invention. FIG. 3 is a side view showing an electrode unfolded according to one embodiment of the present invention. Figure 4 is a side cross-sectional view showing an enlarged view of the portion where the electrode is placed in Figure 2. FIG. 5 is a cross-sectional perspective view showing the portion where the electrodes of a battery cell according to one embodiment of the present invention are arranged by cutting and enlarging. FIG. 6 is a side cross-sectional view showing a comparison of the appearance before and after the terminals are coupled to the ring gasket and the first support member in a battery cell according to one embodiment of the present invention. FIG. 7 is a side cross-sectional view show