KR-20260067575-A - Battery Pack

Abstract

According to exemplary embodiments, a battery pack having an immersion cooling method is provided. The battery pack comprises a pack housing including a base plate and a lid; a plurality of battery cell assemblies housed within the pack housing; and a coolant that at least partially fills the pack housing, wherein each of the plurality of battery cell assemblies comprises a plurality of battery cells and a plurality of spacer assemblies between the plurality of battery cells, and each of the plurality of spacer assemblies comprises a pair of spacers and a plurality of strip pads between the pair of spacers.

Inventors

• 임채원

Assignees

• 주식회사 엘지에너지솔루션

Dates

Publication Date

20260513

Application Date

20241106

Claims (15)

1. Pack housing including a base plate and a lead; A plurality of battery cell assemblies housed within the above-mentioned pack housing; and The above pack housing includes a coolant that at least partially fills, and Each of the above plurality of battery cell assemblies includes a plurality of battery cells and a plurality of spacer assemblies between the plurality of battery cells, and A battery pack in which each of the above plurality of spacer assemblies comprises a pair of spacers and a plurality of strip pads between the pair of spacers.
2. In paragraph 1, A battery pack characterized in that each of the above pair of spacers has a plurality of openings penetrating in the thickness direction of the spacers.
3. In paragraph 2, A battery pack characterized in that both surfaces of the battery cell are in contact with the opening.
4. In paragraph 2, A battery pack characterized in that each of the plurality of openings is a slot-shaped opening extending along the longitudinal direction of the battery cell.
5. In paragraph 2, A battery pack characterized in that the plurality of openings are arranged at regular intervals in the width direction of the battery cell.
6. In paragraph 2, A battery pack characterized in that the above plurality of openings are plurality of through holes.
7. In paragraph 6, A battery pack characterized in that the plurality of through holes are arranged in a matrix.
8. In paragraph 2, A battery pack characterized in that the above pair of spacers are metal or plastic plates.
9. In paragraph 2, A battery pack characterized in that the above-mentioned opening is filled with the above-mentioned coolant.
10. In paragraph 1, A battery pack characterized in that the coolant is insulating oil.
11. In paragraph 2, A battery pack characterized in that each of the plurality of strip pads is located between the plurality of openings in the width direction of the battery cell.
12. In Paragraph 11, A battery pack characterized in that the plurality of strip pads are compression pads extending along the longitudinal direction of the battery cell.
13. In paragraph 2, A battery pack characterized in that the plurality of strip pads are pressed against the surface of the spacer, and a cooling channel is formed by the surface of the spacer and the surface of the strip pads.
14. In Paragraph 13, A battery pack characterized in that the cooling channel is in communication with the opening.
15. In paragraph 1, A battery pack characterized in that the height of the plurality of spacer assemblies is equal to the widthwise length of the battery cell assembly.

Description

Battery Pack The present invention relates to a battery pack, and more specifically, to a battery pack having an immersion cooling method. 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. Various cooling technologies are applied to battery packs to effectively counter thermal runaway phenomena. For example, Patent Document 1 proposes an immersion cooling system that can increase the heat exchange area and resolve the problem of high temperature in the center of the cell by forming a plurality of cooling channels through which a cooling fluid flows in a surface pressure pad stacked between battery cells. However, conventional immersion cooling methods had limitations, such as the difficulty of forming cooling channels in the pad itself and the risk of the channels becoming blocked due to the characteristics of the pad. FIG. 1 is a perspective view showing a battery pack according to an exemplary embodiment of the present invention. Figure 2 is a plan view of Figure 1. Figure 3 is a cross-sectional view along line 1A-1A' of Figure 2. Figure 4 is a cross-sectional view along line B-B' of Figure 3. Fig. 5 is a partially exploded perspective view of Fig. 3. FIG. 6 is a cross-sectional view along line 1A-1A' of a battery pack according to another exemplary embodiment of the present invention. Figure 7 is a cross-sectional view along line C-C' of Figure 6. Fig. 8 is a partially exploded perspective view of Fig. 6. 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 perspective view showing a battery pack according to an exemplary embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a cross-sectional view along line 1A-1A' of FIG. 2, FIG. 4 is a cross-sectional view along line B-B' of FIG. 3, and FIG. 5 is a partially exploded perspective view of FIG. 3. Referring to FIGS. 1 to 5, the battery pack (100) may include a pack housing (110), a plurality of battery cell assemblies (120), an adhesive layer (131, 133), and a coolant (140). The pack housing (110) may provide a space for mounting a battery cell assembly (120). The pack housing (110) may include a base plate (111), side walls (112, 113, 114, 115) and a lead (116). Two directions substantially parallel to the mounting surface (111M) of the base plate (111) are defined as the X direction and the Y direction. The mounting surface (111M) of the base plate (111) may face a plurality of battery cell assemblies (120). A direction substantially perpendicular to the mounting surface (111M) of the base plate (111) is defined as the Z direction. Each of the X d