KR-20260065464-A - BATTERY PACK

KR20260065464AKR 20260065464 AKR20260065464 AKR 20260065464AKR-20260065464-A

Abstract

A battery pack is disclosed. A battery pack according to one embodiment of the present invention may include: a bottom cover assembly; a battery module installed on the upper surface of the bottom cover assembly; a top cover assembly positioned above the battery module, the top cover assembly having a fluid path formed therein and an injection hole communicating with the fluid path and facing the battery module; a hole cover coupled to the lower surface of the top cover assembly and sealing the injection hole; and a support fixed between the hole cover and the battery module and supporting the hole cover.

Inventors

정동익
박주훈
김수열
석헌기
황원필

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260508
Application Date: 20250131
Priority Date: 20241101

Claims (13)

Bottom cover assembly; A battery module installed on the upper surface of the above-mentioned bottom cover assembly; A top cover assembly positioned above the battery module, comprising a fluid channel formed inside and an injection hole communicating with said fluid channel and facing said battery module; A hole cover coupled to the lower surface of the top cover assembly and sealing the injection hole; and, A battery pack including a support that is fixed between the hole cover and the battery module and supports the hole cover.
In Article 1, The above hole cover is, Battery pack having a sheet shape.
In Article 1, The above support is, A battery pack containing a material having elasticity.
In Paragraph 3, The above support is, A battery pack compressed between the above hole cover and the above battery module.
In Article 1, The above support is, A battery pack containing metal material.
In Article 1, The above battery module is: A modular case that provides internal space and is equipped with a top plate; and, It includes a battery cell located inside the above module case, and The above support is, A battery pack coupled to the upper surface of the top plate.
In Article 6, A battery pack in which the above support and the above top plate are integrally formed.
In Article 1, The above support is, A battery pack having a connecting hole facing the hole cover.
In Article 8, A battery pack configured such that the injection hole and the connection hole communicate when a thermal event occurs.
In Article 8, The above battery module is: A modular case that provides internal space and is equipped with a top plate; and, It includes a battery cell located inside the above module case, and The above top plate is, A battery pack having an inlet hole communicating with the injection hole above.
In Article 1, The injection hole above is, A battery pack including a section whose diameter increases toward the top.
In Article 1, The above top cover assembly is: A lower plate with an injection hole formed therein; and, It includes an upper plate positioned on top of the lower plate, and The space between the injection hole and the upper surface of the lower plate is, Battery pack that is filleted or chamfered.
An automobile comprising a battery pack according to any one of claims 1 to 12.

Description

Battery Pack The present invention relates to a battery pack. As the demand for portable electronic products such as smartphones, tablet PCs, and smartwatches increases significantly and electric vehicles become increasingly widespread, research on batteries installed in them, particularly secondary batteries capable of repeated charging and discharging, is actively underway. Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to charge and discharge freely with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density. These lithium secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. The lithium secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing, namely a battery case, that seals and houses the electrode assembly together with an electrolyte. Generally, lithium secondary batteries can be classified according to the shape of the casing into can-type secondary batteries, in which the electrode assembly is embedded in a metal can, and pouch-type secondary batteries, in which the electrode assembly is embedded in a pouch of aluminum laminate sheet. Recently, secondary batteries are widely used for driving or energy storage not only in small devices such as portable electronic devices but also in medium-to-large devices such as electric vehicles and Energy Storage Systems (ESS). A single battery module can be formed by housing multiple such secondary batteries together inside a module case while electrically connected. In this case, each secondary battery included in a single battery module can be referred to as a battery cell. Furthermore, multiple such battery modules can be connected to form a single battery pack. However, when a battery pack contains multiple battery modules, and each module contains multiple battery cells, it may be vulnerable to thermal chain reactions between modules or cells. For example, if an event such as thermal runaway occurs within a single battery module, it is necessary to suppress the propagation of this runaway to other battery modules or cells. If the propagation of thermal runaway between modules or cells is not properly suppressed, an event originating in a specific module or cell may trigger a chain reaction of thermal reactions in other modules or cells, potentially causing explosions or fires, or significantly amplifying their scale. In particular, if an event such as thermal runaway occurs in a single battery module, gases or flames may be randomly released to the outside. If the release of such gases or flames is not properly controlled, they may be released toward other battery modules, potentially causing a thermal chain reaction in those modules. Specifically, module terminals may be located on the front side of a battery module to provide electrical connections to other battery modules or battery packs, such as module busbars. Therefore, if flames are released toward the front of such a battery module, they can damage the module terminals within the battery pack and cause an electrical short circuit. Furthermore, since other battery modules may be located in front of a specific battery module, if flames are released toward the front of that module, the emitted flames may spread toward other modules, making it easy for fire to spread between battery modules. If thermal propagation between battery modules or between battery cells is not properly controlled, a rapid voltage drop in the battery module or battery pack may occur. This can lead to a sudden shutdown of the device equipped with the battery module or battery pack, causing unexpected damage. For example, if a sudden voltage drop in the battery pack occurs while an electric vehicle is in operation, there may not be enough time to move the electric vehicle to a safe location. Furthermore, if thermal propagation between battery modules or battery cells is not properly controlled and a fire or explosion occurs suddenly, there is a high possibility of causing casualties to users. For example, if thermal runaway occurs in an electric vehicle and a certain amount of time is not secured before it progresses into a full-scale fire, the occupants may not be able to escape safely. 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 m