EP-4738540-A1 - BATTERY DEVICE

EP4738540A1EP 4738540 A1EP4738540 A1EP 4738540A1EP-4738540-A1

Abstract

Disclosed herein relates to a battery device including: a base frame; a plurality of cell assemblies provided on the base frame, each including a plurality of battery cells; an inner frame provided on the base frame and disposed between the plurality of cell assemblies; a thermally conductive adhesive layer attaching the plurality of cell assemblies to the base frame; and a first thermal barrier pad containing a first thermally expandable material, disposed between each of the plurality of cell assemblies and the inner frame.

Inventors

PARK, JEONG HOON
SHIN, JU HWAN

Assignees

LG Energy Solution, Ltd.

Dates

Publication Date: 20260506
Application Date: 20250520

Claims (12)

A battery device comprising: a base frame; a plurality of cell assemblies provided on the base frame, each including a plurality of battery cells; an inner frame provided on the base frame and disposed between the plurality of cell assemblies; a thermally conductive adhesive layer attaching the plurality of cell assemblies to the base frame; and a first thermal barrier pad containing a first thermally expandable material, disposed between each of the plurality of cell assemblies and the inner frame.
The battery device of claim 1, wherein a portion of the first thermal barrier pad is provided between the inner frame and the thermally conductive adhesive layer.
The battery device of claim 1, wherein the first thermal barrier pad is connected to the thermally conductive adhesive layer.
The battery device of claim 1, further comprising: a second thermal barrier pad disposed within the thermally conductive adhesive layer and containing a second thermally expandable material.
The battery device of claim 4, wherein the second thermal barrier pad comprises a plurality of first holes filled with the thermally conductive adhesive layer.
The battery device of claim 5, wherein the thermally conductive adhesive layer is in direct contact with the base frame and the plurality of battery cells.
The battery device of claim 4, wherein the second thermal barrier pad has a mesh structure.
The battery device of claim 4, wherein the second thermal barrier pad comprises: a base layer comprising a plurality of second holes; and a thermal expandable layer extending along the base layer and containing the second thermally expandable material.
The battery device of claim 8, wherein the base layer has a mesh structure.
The battery device of claim 1, wherein the first thermally expandable material comprises expanded graphite.
The battery device of claim 1, wherein the base frame comprises a cooling channel configured to allow a cooling fluid to flow.
The battery device of claim 1, further comprising: a top frame covering the plurality of cell assemblies, wherein the top frame is spaced apart from the plurality of cell assemblies with a venting space in between.

Description

[Technical Field] The present disclosure relates to a battery device. This application claims the benefit of Korean Patent Application No. 10-2024-0067704, filed on May 24, 2024, the disclosure of which is incorporated herein by reference. [Background] Unlike primary batteries, secondary batteries can be charged and discharged a plurality of times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, due to improvements in energy density and economies of scale, the manufacturing cost per unit capacity of secondary batteries has decreased dramatically. As the range of battery electric vehicles (BEVs) has increased to levels comparable to fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility. As secondary batteries are used in mobility applications, the demand for their safety has increased. If accidents such as fires occur in secondary batteries used in mobility, they can endanger the life of the driver. Therefore, research on technologies to enhance the safety of secondary batteries is indispensable. [Summary] [Technical Problem] The technical problem that the present disclosure aims to solve is to provide a battery device. [Technical Solution] To solve the aforementioned problems, the technical concept of the present disclosure provides a battery device including: a base frame; a plurality of cell assemblies provided on the base frame, each including a plurality of battery cells; an inner frame provided on the base frame and disposed between the plurality of cell assemblies; a thermally conductive adhesive layer attaching the plurality of cell assemblies to the base frame; and a first thermal barrier pad containing a first thermally expandable material, disposed between each of the plurality of cell assemblies and the inner frame. In exemplary embodiments, a portion of the first thermal barrier pad is provided between the inner frame and the thermally conductive adhesive layer. In exemplary embodiments, the first thermal barrier pad is connected to the thermally conductive adhesive layer. In exemplary embodiments, the battery device further includes a second thermal barrier pad disposed within the thermally conductive adhesive layer and containing a second thermally expandable material. In exemplary embodiments, the second thermal barrier pad includes a plurality of first holes filled with the thermally conductive adhesive layer. In exemplary embodiments, the thermally conductive adhesive layer is in direct contact with the base frame and the plurality of battery cells. In exemplary embodiments, the second thermal barrier pad has a mesh structure. In exemplary embodiments, the second thermal barrier pad includes: a base layer including a plurality of second holes; and a thermal expandable layer extending along the base layer and containing a second thermally expandable material. In exemplary embodiments, the base layer has a mesh structure. In exemplary embodiments, the first thermally expandable material includes expanded graphite. In exemplary embodiments, the base frame includes a cooling channel configured to allow a cooling fluid to flow. In exemplary embodiments, the battery device further includes: a top frame covering the plurality of cell assemblies, wherein the top frame is spaced apart from the plurality of cell assemblies with a venting space in between. [Advantageous Effects] According to exemplary embodiments of the present disclosure, the battery device includes a thermal barrier pad containing a thermally expandable material, thereby preventing or suppressing the transfer of heat emitted from a cell assembly experiencing a thermal event to other cell assemblies through a frame. By preventing or suppressing heat transfer between cell assemblies, the safety and reliability of the battery device can be improved. The effects that can be obtained from the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by one having ordinary knowledge in the technical field to which the exemplary embodiments of the present disclosure belong from the following description. In other words, unintended effects of practicing the exemplary embodiments of the present disclosure can also be derived from the exemplary embodiments of the present disclosure by one having ordinary knowledge in the technical field. [Brief Description of the Drawings] FIG. 1 is a cross-sectional view showing a battery device according to exemplary embodiments of the present disclosure.FIG. 2 is a cross-sectional view of the battery device taken along line II-II' of FIG. 1.FIG. 3 is a cross-sectional view showing a battery device in which a thermal event has occurred.FIG. 4 is a cross-sectional view showing a battery device according to exemplary embodiments of the present disclosure.FIG.