KR-20260065203-A - BATTERY CELL AND BATTERY PACK INCLUDING THE SAME

KR20260065203AKR 20260065203 AKR20260065203 AKR 20260065203AKR-20260065203-A

Abstract

The technical concept of the present invention provides a battery pack comprising: a base frame including a first through hole; a battery cell on the base frame; and a first rupture cover covering the first through hole of the base frame; wherein the battery cell comprises: a cell case provided on a bottom facing the base frame and including a second through hole vertically superimposed on the first through hole of the base frame; a thermal expansion pad provided within the cell case and including a thermal foam material; and an electrode assembly provided within the cell case and disposed between the thermal expansion pad and the first rupture cover.

Inventors

박민수
정혜미
이정훈
김광모

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (15)

Cell case including through holes; A rupture cover covering the through hole of the cell case above; A thermal expansion pad provided within the cell case and comprising a thermal foam material; and An electrode assembly provided within the cell case and disposed between the thermal expansion pad and the rupture cover; A battery cell containing
In Article 1, The above thermal expansion pad is configured to expand above a predetermined temperature to press the electrode assembly toward the rupture cover, and The above rupture cover is configured to rupture by the electrode assembly pressed against the thermal expansion pad, and A battery cell characterized by the electrode assembly being configured to be discharged to the outside of the cell case through the ruptured rupture cover.
In Article 1, A battery cell characterized in that the length of the through hole in the cell case along the first direction is greater than the length of the electrode assembly along the first direction.
In Article 1, A battery cell characterized by further including an external conductive terminal coupled to the cell case and electrically connected to the electrode assembly.
In Paragraph 4, The above cell case is, A bottom plate provided below the electrode assembly and to which the rupture cover is attached; A perimeter wall surrounding the electrode assembly; and A cap plate provided on the electrode assembly and coupled with the external conductive terminal; A battery cell characterized by including
In Article 1, A battery cell characterized by the above-mentioned thermal foam material comprising expanded graphite.
A base frame including a first through hole; Battery cells on the base frame above; and A first rupture cover covering the first through hole of the base frame; Includes, The above battery cell is, A cell case provided on a floor facing the base frame and including a second through hole vertically superimposed on the first through hole of the base frame; A thermal expansion pad provided within the cell case and comprising a thermal foam material; and An electrode assembly provided within the cell case and disposed between the thermal expansion pad and the first rupture cover; A battery pack including
In Article 7, A battery pack characterized in that the length of the first through hole of the base frame in the first direction is greater than the length of the electrode assembly in the first direction.
In Article 7, A battery pack characterized in that the length of the second through hole of the cell case in the first direction is greater than the length of the electrode assembly in the first direction.
In Article 7, A battery pack characterized in that the battery cell further includes a second rupture cover coupled to the cell case to cover the second through hole of the cell case.
In Article 10, The above thermal expansion pad is configured to expand above a predetermined temperature to press the electrode assembly downward, and The first rupture cover and the second rupture cover are configured to rupture by the electrode assembly pressed downward by the thermal expansion pad, and A battery pack characterized by the electrode assembly being configured to be discharged downward from the base frame through the ruptured first rupture cover and the ruptured second rupture cover.
In Article 7, The above cell case is, A bottom plate provided below the electrode assembly and having the second through hole; A perimeter wall surrounding the electrode assembly; and A cap plate provided on the electrode assembly above; Includes, A battery pack characterized by the battery cell being coupled to the cap plate and further including an external conductive terminal electrically connected to the electrode assembly.
In Article 7, A battery pack characterized by further including a cooling structure in contact with the battery cell.
In Article 13, A battery pack characterized in that the above-described cooling structure includes a channel configured to allow a cooling fluid to flow.
In Article 7, A battery pack characterized by the above-mentioned thermal foam material including expanded graphite.

Description

Battery cell and battery pack including the same The present invention relates to a battery cell and a battery pack including the same. Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility. As rechargeable batteries are increasingly used in mobility, demands for their safety are rising. Given that accidents such as fires involving rechargeable batteries in mobility applications can endanger the lives of drivers, research into technologies to enhance battery safety is indispensable. FIG. 1 is a perspective view showing a battery cell according to exemplary embodiments. FIG. 2 is a bottom view showing a battery cell according to exemplary embodiments. Figure 3 is a cross-sectional view of a battery cell along the line III-III' of Figure 1. Figure 4 is a cross-sectional view showing a battery cell in which a thermal event occurred. FIG. 5 is a cross-sectional view showing a battery pack according to exemplary embodiments. Figure 6 is an enlarged view showing a magnified portion of the battery pack of Figure 5. Figure 7 is a cross-sectional view showing a battery pack in which a thermal event occurred. FIG. 8 is a schematic diagram showing an electric vehicle equipped with a battery pack according to exemplary embodiments. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application. In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted. Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion. (1st embodiment) FIG. 1 is a perspective view showing a battery cell (100) according to exemplary embodiments. FIG. 2 is a bottom view showing a battery cell (100) according to exemplary embodiments. FIG. 3 is a cross-sectional view of the battery cell (100) along the line III-III' of FIG. 1. Referring to FIGS. 1 to 3, the battery cell (100) may include a cell case (110), an electrode assembly (120), external conductive terminals (130), a cell rupture cover (140), and a thermal expansion pad (150). The cell case (110) may provide an internal space (119) for accommodating an electrode assembly (120). For example, the cell case (110) may have a cuboidal shape. The cell case (110) may include a bottom plate (111), a perimeter wall (112) extending along the perimeter of the bottom plate (111), and a cap plate (113) coupled to the perimeter wall (112). The bottom plate (111) may extend along a first horizontal direction (e.g., X-axis direction) and a second horizontal direction (e.g., Y-axis direction). The cap plate (113) may extend along a first horizontal direction (e.g., X-axis direction) and a second horizontal direction (e.g., Y-axis direction). The perimeter wall (112) may extend vertically (e.g., in the Z-axis direction) between the bottom plate (111) and the cap plate (113) and may be joined to the perimeter of the bottom plate (111) and the perimeter of the cap plate (113). The perimeter wall (112) may extend continuously along the perimeter of the bottom plate (111) and the perimeter of the cap plate (113) to surround the electrode assembly (120). The cell case (110) may comprise metal. For example, the cell case (110) may comprise aluminum. In exemplary embodiments, the ce