KR-20260063958-A - BATTERY PACK

KR20260063958AKR 20260063958 AKR20260063958 AKR 20260063958AKR-20260063958-A

Abstract

According to exemplary embodiments, a pack housing is provided. The pack housing comprises: a bottom plate; a cross beam on the bottom plate; a plurality of bolts fastened to the bottom plate; and a plurality of shafts fastened to the cross beam, wherein each of the plurality of shafts overlaps a corresponding bolt in a direction perpendicular to the bottom plate.

Inventors

김광모
정혜미
이정훈
이주형

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (13)

Pack housing including a base plate and a side wall perpendicular to the base plate; Battery cell assembly on the above pack housing; A thermally degradable adhesive layer interposed between the battery cell assembly and the base plate; and A battery pack including a frame cover on the battery cell assembly above.
In paragraph 1, A battery pack characterized in that the decomposition temperature of the above-mentioned thermally decomposable adhesive layer is different from the melting temperature of the above-mentioned flame cover.
In paragraph 1, A battery pack characterized in that the decomposition temperature of the thermally decomposable adhesive layer is lower than the melting temperature of the flame cover.
In paragraph 1, A battery pack characterized in that the decomposition temperature of the above-mentioned thermally decomposable adhesive layer is in the range of 100°C to 200°C.
In paragraph 1, A battery pack characterized by the melting temperature of the above-mentioned flame cover being 300℃ or higher.
In paragraph 1, A battery pack characterized by the above-described battery cell assembly comprising battery cells and thermal separators interposed between the battery cells.
In paragraph 6, A battery pack characterized in that the decomposition temperature of the thermally decomposable adhesive layer is different from the melting temperature of each of the thermal separators.
In paragraph 6, A battery pack characterized in that the decomposition temperature of the thermally decomposable adhesive layer is lower than the melting temperature of each of the thermal separators.
In paragraph 6, A battery pack characterized in that the melting temperature of each of the above thermal separators is 300°C or higher.
In paragraph 6, A battery pack characterized by having two or more of the battery cells between two adjacent thermal separators.
In paragraph 6, A battery pack characterized by the above thermal separators alternating with the above battery cells.
In paragraph 1, A battery pack characterized in that the above-mentioned pyrolytic adhesive layer comprises a polymer resin.
In paragraph 1, A battery pack characterized in that the above-mentioned pyrolytic adhesive layer comprises polyurethane.

Description

Battery Pack The present invention relates to a battery pack. 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. The trend in the technological development of secondary batteries for mobility is the improvement of energy density and safety. The safety of secondary batteries for mobility is critical as it is directly related to the lives of passengers. The safety of secondary batteries can be achieved through mechanical robustness, the reliability of electrical insulation, and the delay of heat transfer in the event of a thermal runaway event. FIG. 1 is a plan view showing a battery pack according to exemplary embodiments. Figure 2 is a cross-sectional view taken along the cutting line 1A-1A' of Figure 1. FIG. 3 is a diagram showing the effect of a battery pack according to exemplary embodiments. FIG. 4 is a plan view showing a battery pack according to other 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 plan view showing a battery pack (100) according to exemplary embodiments. Figure 2 is a cross-sectional view taken along the cutting line 1A-1A' of Figure 1. Referring to FIGS. 1 and 2, the battery pack (100) may include a pack housing (110), battery cell assemblies (120), thermally degradable adhesive layers (130), and a flame cover (140). In FIG. 1, the lid (118) of the pack housing (110) and the flame cover (140) are omitted to indicate the arrangement between the components of the battery pack (100). The battery pack (100) may be a final product mounted in an application such as a vehicle. The pack housing (110) may provide a space for mounting battery cell assemblies (120). The pack housing (110) may include a bottom plate (111), side walls (112, 113, 114, 115), a center beam (116), cross beams (117), and a lead (118). Here, two directions substantially parallel to the mounting surface (111M) of the base plate (111) are defined as the X direction and the Y direction, and a direction substantially perpendicular to the mounting surface (111M) of the base plate (111) is defined as the Z direction. The X direction, the Y direction, and the Z direction may be substantially perpendicular to each other. The mounting surface (111M) may face the battery cell assemblies (120). The base plate (111) may have a flat shape. The base plate (111) may include metal. Side walls (112, 113, 114, 115) may be located at the edges of the bottom plate (111). Side walls (112, 113, 114, 115) may be attached to the bottom plate (111). Side walls (112, 113, 114, 115) may be fixed to the bottom plate (111) by methods such as bolting and welding. Side walls (112, 113, 114, 115) may comprise metal. The side walls (112, 113) may be substantially perpendicular to the Y direction. The side walls (112, 113) may be spaced apart from each other in the Y direction. The side walls (114, 115) may be substantially perpendicular to the X direction. The side walls (114, 115) may be spaced apart from each other in the X dir