KR-102963875-B1 - BATTERY MODULE AND BATTERY PACK INCLUDING THE SAME

KR102963875B1KR 102963875 B1KR102963875 B1KR 102963875B1KR-102963875-B1

Abstract

A battery module according to one embodiment of the present invention comprises a battery cell stack having a plurality of battery cells stacked thereon, and a module frame accommodating the battery cell stack, wherein the battery cell comprises a pouch case and an electrode assembly housed within the pouch case, and a foam pad layer for controlling cell swelling is located on the outermost surface of the pouch case.

Inventors

윤현기
문정오

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260511
Application Date: 20200928

Claims (10)

A battery cell stack having multiple battery cells stacked thereon, and It includes a module frame that accommodates the above-mentioned battery cell stack, and The above battery cell includes a pouch case and an electrode assembly housed within the pouch case, and A battery module in which the above pouch case is formed of a laminate sheet, and a foam pad layer for cell swelling control is located on the outermost layer of the above pouch case.
In paragraph 1, The above pouch case is a battery module in which an inner resin layer and a metal layer are sequentially formed in a direction from the electrode assembly toward the outermost layer between the electrode assembly and the outermost layer formed by the foam pad layer.
In paragraph 2, A battery module further comprising an outer resin layer located between the metal layer and the outermost layer.
In Paragraph 3, A battery module further comprising a packaging sheet layer located between the outer resin layer and the outermost layer.
In Paragraph 4, The above packaging sheet layer is formed from nylon or polyethylene terephthalate (PET) material in a battery module.
In Paragraph 3, A battery module in which the inner resin layer, the metal layer, and the outer resin layer are each a PP (polypropylene) layer, an aluminum layer, and a nylon layer.
In paragraph 1, The above foam pad layer is a battery module formed from polyethylene terephthalate (PET) or polyurethane material.
In paragraph 1, Among the battery cells included in the battery cell stack, the battery cell located at the outermost part of the battery cell stack is in contact with the side portion of the module frame, and The battery cell portion in contact with the side portion of the module frame is a battery module, which is the outermost layer formed by the foam pad layer.
In paragraph 8, A battery module having a foam pad layer formed on the outermost surface of the pouch case of each battery cell included in the above battery cell stack.
A battery pack comprising a battery module according to any one of claims 1 to 9.

Description

Battery module and battery pack including the same The present invention relates to a battery module and a battery pack including the same, and more specifically, to a battery module that controls cell swelling and a battery pack including the same. Rechargeable batteries are attracting significant attention as an energy source for various product categories, including mobile devices and electric vehicles. As a promising energy resource capable of replacing conventional products that use fossil fuels, these batteries are gaining prominence as an eco-friendly energy source because they do not generate byproducts during use. Recently, with the increasing need for high-capacity secondary battery structures, including their utilization as energy storage sources, there is a growing demand for battery packs with a multi-module structure that aggregates battery modules in which multiple secondary batteries are connected in series or parallel. Meanwhile, when configuring a battery pack by connecting multiple battery cells in series or parallel, it is common practice to configure a battery module consisting of at least one battery cell and to configure the battery pack by adding other components using this at least one battery module. Such a battery module includes a battery cell stack in which a plurality of battery cells are stacked, a module frame that accommodates the battery cell stack, and a compression pad formed between the module frame and the outermost battery cell of the battery cell stack or between a plurality of battery cells. FIG. 1 is a drawing showing a battery module having a conventional compression pad formed thereon. FIG. 2 is a cross-sectional view taken along the stacking direction of the battery cell stack of FIG. 1. Referring to FIGS. 1 and 2, a compression pad (30) is formed between the outermost battery cell of the battery cell stack (10) and the module frame (20). Although not shown, a compression pad (30) may also be additionally formed between some of the battery cells (11) of the battery cell stack (10). The compression pad (30) can be formed to cover most of the side of the module frame (20) corresponding to the battery cell (11). At this time, when swelling occurs in the battery cells (11), the battery cells (11) may swell as shown in FIG. 2. In the past, even if the compression pad (30) is compressed by pressure, there was a minimum compression thickness (w) at which further compression of the compression pad (30) was not achieved, so there was a problem in that it was difficult to respond flexibly to the swelling phenomenon of the battery cells (11). Figure 1 is a drawing showing a battery module with a conventional compression pad formed thereon. Figure 2 is a cross-sectional view taken along the stacking direction of the battery cell stack of Figure 1. FIG. 3 is an exploded perspective view showing a pouch-type battery cell according to one embodiment of the present invention. Figure 4 is a perspective view showing the assembled pouch-type battery cell of Figure 3. Figure 5 is a cross-sectional view taken along the cutting line A-A' of Figure 4. Figure 6 is a cross-sectional view showing an enlarged view of region P of Figure 5. FIG. 7 is a cross-sectional view showing a battery module including the pouch-type battery cell of FIG. 4. Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification. Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present invention is not necessarily limited to what is illustrated. Thicknesses have been enlarged in the drawings to clearly represent various layers and regions. Additionally, for convenience of explanation, the thickness of some layers and regions has been exaggerated in the drawings. Furthermore, when a part such as a layer, membrane, region, or plate is said to be "on" or "on" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when a part is said to be "directly above" another part, it means that there is no other part in between. Also, saying that a part is "on" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "on" or "on" facing the opposite direction of gravity. Furthermore, throughout the specification, when a part is described as "including" a certain component, this means that, unless sp