KR-20260062693-A - Battery Pack

Abstract

According to exemplary embodiments of the present invention, a battery pack is provided that embodies a technical concept of cooling from the upper side and venting gas from the lower side of the battery pack. The battery pack comprises: a pack case having a venting space; at least one battery unit housed inside the pack case above the venting space; and a cooling plate that seals the upper surface of the pack case, is closely coupled to the battery unit, and has a cooling circulation channel.

Inventors

• 장혁균
• 김수열
• 박주훈
• 박기찬

Assignees

• 주식회사 엘지에너지솔루션

Dates

Publication Date

20260507

Application Date

20241029

Claims (15)

1. Pack case having a venting space; At least one battery unit housed inside the pack case above the venting space; and A battery pack comprising a cooling plate that seals the upper surface of the pack case and is coupled to the battery unit.
2. In paragraph 1, The above pack case is, base plate and, A side plate surrounding the above base plate, and It includes a venting plate spaced apart from the base plate, and A battery pack having the venting space at the bottom of the venting plate.
3. In paragraph 2, The above venting plate is a battery pack having a plurality of openings communicating with the battery unit and the venting space.
4. In paragraph 3, A battery pack characterized in that the above-mentioned opening is a venting hole.
5. In paragraph 2, A battery pack characterized in that the above-mentioned venting plate is an uneven plate having an opening formed therein, and a venting channel is formed by the uneven shape.
6. In paragraph 1, The above pack case is a battery pack having a venting device formed on the side of the pack case that communicates with the venting space at a position higher than the position of the venting space.
7. In paragraph 1, A battery pack comprising a cooling plate having a water injection hole in a position facing the battery unit and a meltable plug that closes the water injection hole.
8. In Paragraph 7, The above-mentioned meltable plug is melted by an abnormal temperature rise of the battery unit, causing the water injection hole to open, and coolant flows out from the opened water injection hole and is supplied to the battery unit.
9. In Paragraph 7, A battery pack characterized in that the coolant supplied to the above battery unit flows into the above venting space.
10. In Paragraph 7, A battery pack characterized by having a water supply passage formed on the upper part of the battery unit at a position corresponding to the above-mentioned meltable plug.
11. In Paragraph 7, The above battery unit is provided in multiple units, and A battery pack characterized in that the above-mentioned water supply holes are formed in an equal number for each battery unit.
12. In paragraph 1, The above cooling plate is provided with an inlet and an outlet for the inflow and outflow of cooling water, and the battery pack includes a cooling circulation path connected to the inlet and the outlet.
13. In Paragraph 12, A battery pack characterized in that the cooling circulation path is a meandering path that passes through the plurality of battery units at least once.
14. In paragraph 1, The above battery unit is a battery pack comprising a battery module in which a cell assembly is accommodated.
15. In paragraph 1, The above battery unit is a battery pack comprising a cell block of a modular structure in which at least part or all of the upper surface of the cell assembly is open.

Description

Battery Pack The present invention relates to a battery pack, and more specifically, to a battery pack that implements the technical concept of so-called upper cooling and lower venting, wherein cooling is performed on the upper side of the pack and venting is performed on the lower side of the pack. As technology development and demand for mobile devices and electric vehicles increase, the demand for secondary batteries as an energy source is rapidly growing. A secondary battery is a battery capable of repeated charging and discharging, and multiple battery modules, each containing multiple battery cells housed in a module frame, are mounted in electric vehicles or the like to form a battery pack. Recently, to increase the energy density of battery packs, Cell-to-Pack (CTP) battery packs are being developed, which eliminate battery modules and configure the battery pack by installing battery cells directly into the battery pack case. Battery cells within a battery pack may be exposed to heat or flames due to the charging and discharging process or external impact. When such events occur, a phenomenon called thermal runaway, in which heat or flames generated in one cell propagate to adjacent cells, can lead to a chain reaction of explosions in the battery pack. To effectively counter thermal runaway phenomena in battery packs, various cooling and gas venting technologies are applied to the battery packs. For example, Patent Document 1 proposes a battery pack that injects cooling water directly into the ignited battery cell from the upper side of the battery pack to prevent the spread of a flame ignited in a battery cell within the battery pack. However, in the case of existing battery packs, the venting design technology was insufficient, so the venting gas generated by thermal runaway could not be properly isolated and discharged, which had limitations in delaying thermal propagation to adjacent banks or adjacent modules. FIG. 1 is a schematic diagram of a battery pack according to an exemplary embodiment of the present invention. Figure 2 is a schematic diagram illustrating the thermal propagation (TP) prevention effect in the battery pack of Figure 1. FIG. 3 is a schematic diagram of a battery pack according to another exemplary embodiment of the present invention. Figure 4 is a schematic diagram illustrating the thermal propagation (TP) prevention effect in the battery pack of Figure 3. Figure 5 is a schematic plan view of the cooling plate of the battery pack of Figure 3. Figure 6 is a schematic plan view of another cooling plate of the battery pack of Figure 3. FIG. 7 is an exploded perspective view of a battery pack according to another exemplary embodiment of the present invention. FIG. 8 is a detailed exploded perspective view of the battery module of FIG. 7. Figure 9 is a partial cross-sectional view of Figure 7. FIG. 10 is a schematic diagram of another battery pack according to an exemplary 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 claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application. In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted. Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion. (1st embodiment) FIG. 1 is a schematic diagram of a battery pack (100) according to an exemplary embodiment of the present invention, and FIG. 2 is a schematic diagram for explaining the heat propagation (TP) prevention effect in the battery pack (100) of FIG. 1. In FIG. 1, the battery pack (100) of the present invention schematically shows a lower venting structure in which a venting gas is discharged from a venting space (111) on the lower side, along with upper cooling in which