KR-20260066371-A - Battery pack and vehicle including the same

KR20260066371AKR 20260066371 AKR20260066371 AKR 20260066371AKR-20260066371-A

Abstract

A battery pack according to the present invention comprises a cell assembly having a plurality of battery cells and a bottom frame disposed on one side of the cell assembly, wherein the bottom frame is provided with a first venting space exposed to the cell assembly, a second venting space communicating with the first venting space through a plurality of communication holes, and a third venting space communicating with the second venting space through at least one opening, and the plurality of communication holes are configured to guide the flow direction of the venting gas discharged into the second venting space toward the opening.

Inventors

박신영
강종모
권현수
노용환
서성원
안문열
이상준
황원모
황태원

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260512
Application Date: 20241104

Claims (13)

A battery pack comprising a cell assembly having a plurality of battery cells and a bottom frame disposed on one side of the cell assembly, In the above bottom frame, A first venting space exposed to the cell assembly, a second venting space communicating with the first venting space through a plurality of communication holes, and a third venting space communicating with the second venting space through at least one opening are provided. The plurality of the above communication holes are, A battery pack characterized by being configured to guide the flow direction of the venting gas discharged into the second venting space toward the opening.
In paragraph 1, At least one of the above-mentioned communication holes is, A battery pack characterized by being formed at an angle toward the above-mentioned opening.
In paragraph 1, The size of the above communication hole is, A battery pack characterized by being formed larger in an area relatively close to the opening than in an area relatively far from the opening.
In paragraph 1, The density of the above communication holes is, A battery pack characterized by being formed larger in an area relatively close to the opening than in an area relatively far from the opening.
In paragraph 1, In at least one of the above communication holes, A battery pack characterized by having a protruding guide portion that can guide the flow direction of the venting gas discharged into the second venting space toward the opening.
In paragraph 5, The above guide part is, A battery pack characterized by having a shape corresponding to the above-mentioned communication hole and extending from the above-mentioned communication hole toward the second venting space.
In paragraph 1, The above opening is, It includes a first opening formed at one end of the third venting space and a second opening formed at the other end, and The plurality of the above communication holes are, A battery pack characterized by being symmetrically provided toward the first opening and the second opening.
In paragraph 1, The above bottom frame is, A battery pack characterized by being positioned at the bottom of the cell assembly.
In paragraph 1, A battery pack characterized by further including a venting device capable of communicating the third venting space and the outside of the battery pack with each other.
In paragraph 1, In the cell assembly above, A plurality of the above battery cells are stacked and arranged together, The above-mentioned first venting space is, A battery pack characterized by being extended in a direction parallel to the stacking direction of a plurality of the battery cells.
In paragraph 1, The above bottom frame is, An inner frame disposed on one side of the above cell assembly; An outer frame disposed on one side of the inner frame; and A routing frame disposed between the inner frame and the outer frame is provided, The above-mentioned first venting space is, It is formed between the cell assembly and the inner frame, and The above second venting space is, It is formed between the inner frame and the outer frame, and The above third venting space is, A battery pack characterized by being formed on the inner side of the routing frame.
In Paragraph 11, The inner frame mentioned above is, It is provided with a side plate portion that partitions the first venting space and the second venting space, and The plurality of the above communication holes are, A battery pack characterized by being formed by perforating the above-mentioned side plate.
An automobile characterized by including at least one battery pack according to any one of claims 1 to 12.

Description

Battery pack and vehicle including the same The present invention relates to a battery pack and an automobile including the same, and more specifically, to a battery pack and an automobile including the same that enables smooth venting when a thermal event occurs and effectively prevents heat transfer phenomena. Secondary batteries, which possess electrical characteristics such as high energy density and high applicability across product groups, are widely applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric sources. These secondary batteries are attracting attention as a new energy source for enhancing eco-friendliness and energy efficiency, not only for the primary advantage of drastically reducing the use of fossil fuels but also because they generate no by-products from energy use. Currently, widely used types of rechargeable batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. Generally, lithium rechargeable batteries can be classified according to the shape of the casing into can-type rechargeable batteries, in which the electrode assembly is housed in a metal can, and pouch-type rechargeable batteries, in which the electrode assembly is housed in a pouch made of aluminum laminate sheets. When a high output voltage is required, multiple battery cells may be connected in series to form a battery module or battery pack. Additionally, to increase charge/discharge capacity, multiple battery cells may be connected in parallel to form a battery module or battery pack. Accordingly, the number of battery cells included in the battery module or pack can be varied depending on the required output voltage or charge/discharge capacity. When configuring a battery pack by connecting multiple battery cells in series or parallel, it is common practice to first construct a battery module containing at least one battery cell, and then use this at least one battery module to add other components to form a battery pack or battery rack. Alternatively, recently, battery packs in the form of a "Cell-to-Pack," in which multiple battery cells are directly housed in a pack housing without modularization, are also being manufactured. However, when a battery pack contains multiple battery cells in this manner, it may be vulnerable to thermal chain reactions between battery cells or battery modules. For example, if a thermal event, such as thermal runaway, occurs in a single battery cell, this thermal event can be transferred to other battery cells or modules. If this thermal transfer phenomenon is not properly suppressed, a thermal event originating in a specific battery cell can trigger a chain reaction in other battery cells or modules, potentially causing major problems such as explosions or fires. 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 appearance of a battery pack according to one embodiment of the present invention. Figure 2 is a perspective view showing the battery pack of Figure 1 disassembled. Figure 3 is a side cross-sectional view showing a part of the AA' section of Figure 1. FIG. 4 is a plan view showing a part of the interior of a battery pack according to one embodiment of the present invention. Figure 5 is a plan view showing an enlarged portion of Figure 4. FIG. 6 is a plan view showing an enlarged portion of the interior of a battery pack according to another embodiment of the present invention. FIG. 7 is a plan view showing an enlarged portion of the interior of a battery pack according to another embodiment of the present invention. FIG. 8 is an enlarged view of the side plate portion of a battery pack according to a modified example of an embodiment of the present invention. FIG. 9 is a cross-sectional perspective view showing a bottom frame of a battery pack according to one embodiment of the present invention. FIG. 10 is a perspective view showing the bottom frame of FIG. 9 exploded. FIG. 11 is a perspective view showing a cell assembly of a battery pack according to one embodiment of the present invention. FIG. 12 is a perspective view showing a vent cover disassembled in a cell assembly of a battery pack according to one embodiment of the present invention. FIG. 13 is a drawing showing a vehicle according to one embodiment of the present invention. 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