JP-2026514322-A - Battery packs and automobiles containing them

JP2026514322AJP 2026514322 AJP2026514322 AJP 2026514322AJP-2026514322-A

Abstract

A battery pack and an automobile including the same are disclosed. A battery pack according to one embodiment of the present invention includes a plurality of battery modules in which a plurality of battery cells are stacked, a pack case in which the plurality of battery modules are housed, and a lid member coupled to the pack case, wherein at least one of the lid members is formed to be deformable and has a double structure. [Selection Diagram] Figure 3

Inventors

キム，クァンモ
チョン，ヘミ

Assignees

エルジーエナジーソリューションリミテッド

Dates

Publication Date: 20260511
Application Date: 20250103
Priority Date: 20240227

Claims (14)

Multiple battery modules, each consisting of multiple battery cells stacked on top of each other, A pack case in which the aforementioned multiple battery modules are housed, Includes a lid member that connects to the pack case, The battery pack is characterized in that the lid member is composed of a double structure in which at least one is formed to be deformable.
The aforementioned lid member is A first lid, in which at least one side is formed to be deformable, The battery pack according to claim 1, further comprising a second lid spaced at a predetermined interval from the first lid.
The battery pack according to claim 2, characterized in that the first lid is located on the inside and the second lid is located on the outside.
The aforementioned pack case is The lower frame on which the aforementioned multiple battery modules are mounted, A side frame extending upward from the edge of the lower frame, An inner frame extending upward from the inside of the lower frame and connected to the side frame, Includes a partition frame coupled to the inner frame and interposed between the plurality of battery modules, The battery pack according to claim 3, characterized in that at least one of the inner frame and the partition frame has a fastening joint portion formed therein, to which the second lid is fastened.
The fastening joint is, A protruding portion that protrudes from at least one of the inner frame and the partition wall frame, The battery pack according to claim 4, characterized in that it includes a fastening hole formed in the protruding portion.
The battery pack according to claim 5, characterized in that the first lid has a through hole formed at a position corresponding to the protruding portion.
The battery pack according to claim 6, characterized in that the through-hole of the first lid passes through the protruding portion, and the first lid contacts at least one of the inner frame and the partition frame.
The battery pack according to claim 4, characterized in that the second cover is located above the first cover and fastened to the fastening coupling portion.
The battery pack according to claim 2, characterized in that the first lid is fastened at its edge, and deformation occurs in the portion excluding the edge due to vent gas generated by the battery cell, thereby forming a movement passage.
The battery pack according to claim 2, characterized in that the first lid is deformed within the gap formed between it and the second lid.
The battery pack according to claim 2, characterized in that a vent portion is formed in the pack case.
The aforementioned vent section is, A vent hole through which vent gas generated from the aforementioned battery cell is discharged, The battery pack according to claim 11, further comprising a vent valve that closes the vent hole and is opened when the internal pressure of the pack case exceeds a preset value.
The battery pack according to claim 12, characterized in that the first lid is deformed to form a movement passage, and the vent gas moves to the vent section through the movement passage.
An automobile comprising at least one battery pack according to any one of claims 1 to 13.

Description

This invention relates to a battery pack and an automobile including the same, and more particularly, to a battery pack and an automobile including the same in which heat is uniformly diffused and gas is smoothly discharged when a thermal event occurs. This application claims priority under Korean Patent Application No. 10-2024-0028132, filed on February 27, 2024, and all information disclosed in the specification and drawings of said application is incorporated herein. Generally, a secondary battery refers to a battery that can be repeatedly charged and discharged, such as lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The most basic secondary battery cells can provide an output voltage of approximately 2.5V to 4.2V. Recently, as such battery cells have been applied to devices requiring high output voltage and large charging capacity, such as electric vehicles and energy storage systems (ESS), battery modules, which are constructed by connecting multiple battery cells in series, parallel, or a combination of series and parallel, and battery packs, which are constructed by further connecting such battery modules in series, parallel, or a combination of series and parallel, are becoming widely used. Lithium-ion batteries have gained attention due to their advantages, such as high operating voltage and significantly higher energy density. However, because they use organic electrolytes, overcharging can induce overcurrent and overheating, potentially leading to explosions and fires. Various types of rechargeable batteries include battery modules, which are equipped with a module case capable of protecting battery cells and in which multiple battery cells are stacked and placed in the module case, and battery packs, which include multiple battery modules. Figure 1 is a cross-sectional view of a conventional battery pack. Referring to Figure 1, in the case of a conventional battery pack 1, the lid member 3 that connects to the pack case 2 is fixed to the battery module 4 by fastening members 5 such as bolts, either in contact with or in close proximity to it. That is, in the conventional battery pack 1, because one lid member 3 is firmly fixed to the pack case 2, there is no margin or buffer space formed for the heat or gas from the flame to move even if a flame occurs. In this state, if a flame occurs in the battery cell 6, the heat from the flame is blocked by the cover member 3 and does not dissipate, instead concentrating inside the battery module 4 where the flame originated. Furthermore, the gas generated inside the battery module 4 is not released, increasing the internal pressure and raising the likelihood of explosion of the battery module 4 or the battery pack 1. In this scenario, if an explosion occurs in the battery module 4 where the flame originated, the flame may spread to other battery modules 4, causing a thermal runaway phenomenon. If the flame escapes to the outside due to such a thermal runaway phenomenon, there is a risk of burns to the driver of the electric vehicle or putting them in a dangerous situation. Alternatively, there is a problem in that the battery module 4 or battery pack 1 may be damaged or completely burned due to a chain reaction of flames caused by flame propagation, making it difficult to ensure the safety of the battery module 4 or battery pack 1. This is a cross-sectional view of a conventional battery pack.This is a perspective view of a battery pack according to one embodiment of the present invention.This is a perspective view of a disassembled battery pack according to one embodiment of the present invention.This figure shows how the first lid is attached to the pack case.This is an enlarged view of section B in Figure 4.This is a plan view showing a battery pack with the cover member removed, according to one embodiment of the present invention.This diagram shows the vent portion of a battery pack according to one embodiment of the present invention.This figure shows the vent holes in the vent section of Figure 7.This is a cross-sectional view along line A-A' in Figure 2.This figure shows the deformation of the first lid in Figure 9.This is a diagram illustrating an automobile including a battery pack according to each embodiment of the present invention. The following describes preferred embodiments of the present invention in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and the claims should not be interpreted in their ordinary or dictionary sense, but rather in accordance with the principle that the inventor himself can appropriately define the concepts of terms in order to best describe the invention, and in accordance with the meaning and concepts of the technical idea of the present invention. Therefore, the embodiments described herein and the configurations shown in the drawings represent only one of the most pr