US-20260128459-A1 - BATTERY PACK AND VEHICLE INCLUDING THE SAME

US20260128459A1US 20260128459 A1US20260128459 A1US 20260128459A1US-20260128459-A1

Abstract

A battery pack includes: a cell assembly including a plurality of battery cells; and a bottom frame disposed on one side of the cell assembly. 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. The plurality of communication holes are configured to guide a flow direction of a venting gas discharged into the second venting space, to a direction toward the opening.

Inventors

Shin-Young Park
Jong-Mo KANG
Hyun-Soo KWON
Yong-Hwan RO
Sung-won Seo
Moon-Youl Ahn
Sang-Joon Lee
Won-Mo HWANG
Tae-Won HWANG

Assignees

LG ENERGY SOLUTION, LTD.

Dates

Publication Date: 20260507
Application Date: 20250930
Priority Date: 20241104

Claims (20)

1 . A battery pack comprising: a cell assembly including 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 a flow direction of a venting gas discharged into the second venting space, to a direction toward the opening.
2 . The battery pack according to claim 1 , wherein at least one of the plurality of communication holes is formed to be inclined toward the opening.
3 . The battery pack according to claim 1 , wherein a size of each of the plurality of communication holes is larger in an area relatively apart from the opening than in an area relatively close to the opening.
4 . The battery pack according to claim 1 , wherein a density of the plurality of communication holes is higher in an area relatively apart from the opening than in an area relatively close to the opening.
5 . The battery pack according to claim 1 , wherein at least one of the plurality of communication holes is provided with a guide protruding to guide the flow direction of the venting gas discharged into the second venting space, to the direction toward the opening.
6 . The battery pack according to claim 5 , wherein the guide has a shape corresponding to the at least one of the plurality of communication holes, and extends from the at least one of the plurality of communication holes toward the second venting space.
7 . The battery pack according to claim 1 , wherein the opening includes a first opening formed in one end of the third venting space, and a second opening formed in an opposite end of the third venting space, and the plurality of communication holes are provided to be symmetrical with each other toward the first opening and the second opening.
8 . The battery pack according to claim 1 , wherein the bottom frame is disposed underneath the cell assembly.
9 . The battery pack according to claim 1 , further comprising a venting device capable of communicating the third venting space with an outside of the battery pack.
10 . The battery pack according to claim 1 , wherein in the cell assembly, the plurality of battery cells are arranged to be stacked, the first venting space is elongated in a direction parallel to a stacking direction of the plurality of battery cells.
11 . The battery pack according to claim 1 , wherein the bottom frame includes an inner frame disposed on one side of the 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, the first venting space is formed between the cell assembly and the inner frame, the second venting space is formed between the inner frame and the outer frame, and the third venting space is formed inside the routing frame.
12 . The battery pack according to claim 11 , wherein the inner frame includes a side panel partitioning the first venting space and the second venting space, and the plurality of communication holes are formed by perforating the side panel.
13 . A vehicle comprising at least one battery pack according to claim 1 .
14 . A bottom frame disposed on one side of a cell assembly including a plurality of battery cells, 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 a flow direction of a venting gas discharged into the second venting space, to a direction toward the opening.
15 . The bottom frame according to claim 14 , wherein at least one of the plurality of communication holes is formed to be inclined toward the opening.
16 . The bottom frame according to claim 14 , wherein a size of each of the plurality of communication holes is larger in an area relatively apart from the opening than that in an area relatively close to the opening.
17 . The bottom frame according to claim 14 , wherein a density of the plurality of communication holes is higher in an area relatively apart from the opening than that in an area relatively close to the opening.
18 . The bottom frame according to claim 14 , wherein at least one of the plurality of communication holes is provided with a guide protruding to guide the flow direction of the venting gas discharged into the second venting space, to the direction toward the opening.
19 . The bottom frame according to claim 18 , wherein the guide has a shape corresponding to the at least one of the plurality of communication holes, and extends from the at least one of the plurality of communication holes toward the second venting space.
20 . The bottom frame according to claim 14 , wherein the opening includes a first opening formed in one end of the third venting space, and a second opening formed in an opposite end of the third venting space, and the plurality of communication holes are provided to be symmetrical toward the first opening and the second opening.

Description

CROSS REFERENCES TO RELATED APPLICATIONS This application is based on and claims priority from Korean Patent Application No. 10-2024-0154301, filed on Nov. 4, 2024, with the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. TECHNICAL FIELD The present disclosure relates to a battery pack and a vehicle including the same. BACKGROUND Secondary batteries, which are easily applicable to various product types and have a high energy density as electrical characteristics, are widely used not only in portable devices but also in electric vehicles (EV) and hybrid electric vehicles (HEV) that are powered by an electrical power source. Secondary batteries offer the primary advantage of significantly reducing fossil fuel consumption, and furthermore, generate no by-products during the use of energy. Thus, secondary batteries are gaining attention as a new energy source for enhancing environmental sustainability and energy efficiency. Presently, widely used types of secondary batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and so on. In general, according to the shapes of exterior materials, lithium secondary batteries may be classified into can-type secondary batteries, in which an electrode assembly is mounted in a metal can, and pouch-type secondary batteries, in which an electrode assembly is mounted in a pouch of an aluminum laminate sheet. When a high output voltage is required, multiple battery cells may be connected in series to form a battery module or a battery pack. For the purpose of increasing the charge/discharge capacity, multiple battery cells may be connected in parallel, thereby forming a battery module or a battery pack. The number of battery cells included in the battery module or pack may be variously set according to the required output voltage or charge/discharge capacity. When multiple battery cells are connected in series/parallel to form a battery pack, it is common to first form a battery module including at least one battery cell, and then, form a battery pack or a battery rack by adding other components using the formed battery module. Recently, a cell-to-pack type battery pack has been manufactured, in which multiple battery cells are accommodated directly in a pack housing or the like without being modularized. SUMMARY The present disclosure provides a battery pack capable of smooth venting upon the occurrence of a thermal event, and a vehicle including the same. Further, the present disclosure provides a battery pack, in which a thermal propagation phenomenon may be effectively prevented or suppressed, and a vehicle including the same. The objects sought to be achieved by the present disclosure are not limited to those described above, and other objects that are not described herein may clearly be understood by those skilled in the art from the descriptions of the invention herein below. A battery pack according to the present disclosure includes: a cell assembly including a plurality of battery cells; and a bottom frame disposed on one side of the cell assembly. 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. The plurality of communication holes are configured to guide a flow direction of a venting gas discharged into the second venting space, to a direction toward the opening. At least one of the plurality of communication holes may be formed to be inclined toward the opening. A size of each of the plurality of communication holes may be larger in an area relatively apart from the opening than in an area relatively close to the opening. A density of the plurality of communication holes may be higher in an area relatively apart from the opening than in an area relatively close to the opening. At least one of the plurality of communication holes may be provided with a guide protruding to guide the flow direction of the venting gas discharged into the second venting space, to the direction toward the opening. The guide may have a shape corresponding to the at least one of the plurality of communication holes, and extend from the at least one of the plurality of communication holes toward the second venting space. The opening may include a first opening formed at one end of the third venting space, and a second opening formed at an opposite end of the third venting space, and the plurality of communication holes may be provided to be symmetrical with each other toward the first opening and the second opening. The bottom frame may be disposed underneath the cell assembly. The battery pack may further include a venting device capable of communicating the third venting space with an outside of