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KR-20260064155-A - Battery cell assembly, battery pack and means of transport including the same

KR20260064155AKR 20260064155 AKR20260064155 AKR 20260064155AKR-20260064155-A

Abstract

The battery cell assembly of the present invention comprises a first cell frame accommodating a plurality of first battery cells, a second cell frame accommodating a plurality of second battery cells and arranged to be stacked on one side of the first cell frame, and a screen sheet disposed between the stacked first cell frame and the second cell frame. Each of the first cell frame and the second cell frame is provided with a first coupling portion and a second coupling portion arranged to be coupled to each other upon stacking, and the screen sheet has an insertion hole formed therein for inserting at least one of the first coupling portion and the second coupling portion.

Inventors

  • 안태선
  • 윤형철

Assignees

  • 주식회사 엘지에너지솔루션

Dates

Publication Date
20260507
Application Date
20241031

Claims (11)

  1. Multiple first battery cells; A first cell frame accommodating the plurality of first battery cells; Multiple second battery cells; A second cell frame configured to accommodate the plurality of second battery cells and to be stacked on one side of the first cell frame; and A screen sheet disposed between the stacked first cell frame and the second cell frame; comprising Each of the first cell frame and the second cell frame is provided with a first coupling part and a second coupling part arranged to be coupled to each other when stacked, and A battery cell assembly characterized in that the screen sheet has an insertion hole formed therein so that at least one of the first coupling part and the second coupling part is inserted.
  2. In paragraph 1, The stacked first cell frame and the second cell frame each have a first surface of the first cell frame and a second surface of the second cell frame facing each other, The first surface of the first cell frame is provided with a first-1 coupling part and a first-2 coupling part, and On the second surface of the second cell frame, a 2-1 coupling part provided to be coupled with the 1-1 coupling part and a 2-2 coupling part provided to be coupled with the 1-2 coupling part are provided. A battery cell assembly characterized in that the screen sheet has a plurality of first insertion holes formed therein so that at least a portion of the first-1 coupling portion and the second-1 coupling portion is inserted, and a plurality of second insertion holes formed therein so that at least a portion of each of the first-2 coupling portion and the second-2 coupling portion is inserted.
  3. In paragraph 1, The above screen sheet is, A battery cell assembly characterized by being fixed in a direction perpendicular to the insertion direction, wherein at least one of the first coupling part and the second coupling part is inserted into the insertion hole.
  4. In paragraph 1, Each of the first coupling part and the second coupling part has a column shape protruding from the first cell frame and the second cell frame, A first hole and a second hole are formed extending to the end along the above column, and The first coupling portion of the first cell frame is inserted into and fixed in the second hole of the second coupling portion of the second cell frame, and A battery cell assembly characterized by the first coupling portion of the second cell frame being inserted into and fixed in the second hole of the second coupling portion of the first cell frame.
  5. In paragraph 1, The first cell frame includes a plurality of first support ribs arranged to support one side of the screen sheet, and A battery cell assembly characterized in that the second cell frame includes a plurality of second support ribs arranged to support the other side of the screen sheet.
  6. In paragraph 5, A battery cell assembly characterized in that the first support rib and the second support rib are arranged to support one side and the other side of the screen sheet at corresponding positions.
  7. In paragraph 5, The first cell frame is provided with a plurality of first openings arranged so that the positive terminal and negative terminal of the plurality of first battery cells are exposed to the outside, and The second cell frame is provided with a plurality of second openings arranged so that the positive terminal and negative terminal of the plurality of second battery cells are exposed to the outside, and The first support rib is located between two adjacent first openings, and A battery cell assembly characterized in that the second support rib is positioned between two adjacent second openings.
  8. In Paragraph 7, The above-mentioned first support rib is, It includes a first-1 partition section erected in the stacking direction of the first cell frame and the second cell frame, and a first-2 partition section spaced apart from the first-1 partition section by a predetermined distance. The above second support rib is, A battery cell assembly characterized by including a 2-1 partition section erected in the stacking direction of the 1 cell frame and the 2 cell frame, and a 2-2 partition section spaced apart from the 2-1 partition section by a predetermined distance.
  9. In paragraph 8, A spaced-apart space open on both sides is provided between the above-mentioned first-1 partition and the above-mentioned first-2 partition, and A battery cell assembly characterized by having a spaced-apart space open on both sides between the above-mentioned 2-1 partition and the above-mentioned 2-2 partition.
  10. A battery pack comprising a battery cell assembly according to any one of claims 1 to 9.
  11. A moving means comprising a battery cell assembly according to any one of claims 1 to 9.

Description

Battery cell assembly, battery pack including the same, and means of transport including the same The present invention relates to a battery cell assembly, a battery pack including the same, and a means of transport. More specifically, it relates to a battery cell assembly capable of stably fixing a plurality of battery cells and effectively preventing heat propagation between battery cells, a battery pack including the same, and a means of transport. With the recent rapid growth of the electric vehicle and energy storage system markets, the demand for high-performance and high-safety batteries is increasing significantly. In line with this trend, the battery industry is focusing on the development of battery modules equipped with multiple battery cells. In particular, optimizing the structure of battery modules to provide high energy density and stability is emerging as a critical challenge. One of the methods currently widely used in battery pack manufacturing is the Cell Module Assembly structure. A Cell Module Assembly refers to a form in which multiple battery cells are housed in a cell frame arranged in a specific pattern, with two or more units combined. It offers the advantage of facilitating the design and implementation of battery packs according to required battery capacity or output. In particular, to enhance the efficiency of electrical connections during the manufacturing of Cell Module Assemblies, a method in which the positive terminals are arranged to face each other is frequently used. FIG. 1 is a schematic perspective view showing the appearance of a battery cell assembly (30) in which a conventional general upper cell frame (20) and a lower cell frame (10) are combined with each other. FIG. 2 is a schematic cross-sectional view showing a part of the interior of the battery cell assemblies (30) of FIG. 1. Referring to FIGS. 1 and 2, the lower cell frame (10) and the upper cell frame (20) can each be arranged to be stacked in the vertical direction. The battery cells (3) housed in the upper cell frame (20) and the lower cell frame (10) are inserted and fixed inside the upper cell frame (2) and the lower cell frame (4). At this time, the battery cells (3) housed in the upper cell frame (20) and the lower cell frame (10) may be arranged such that their respective positive terminals (6) face each other. Additionally, the battery cells (3) and the bus bar (14) can be electrically connected through a wire member (12). At this time, the upper cell frame (20) and the lower cell frame (10) are each provided with a first coupling part (9) and a second coupling part (8) for coupling the cell frames (10, 20) to each other. The second coupling part (9) provided at the bottom of the upper cell frame (20) and the first coupling part (8) provided at the top of the lower cell frame (10) can be arranged to be coupled to each other in a male-female manner at corresponding positions. That is, the upper cell frame (20) and the lower cell frame (10) are configured to be coupled to each other by inserting the second coupling part (9) into the internal empty space of the first coupling part (8). However, conventional battery cell assemblies have several significant limitations. First, there is a safety issue that occurs when a battery cell explodes. Since battery cells tend to explode in the direction where the positive terminal (6) is formed, as shown in FIG. 2, in a structure where the positive terminals (6) face each other, flames and flying debris from the explosion of one battery cell can move to the opposite battery cell (3) and directly cause heat propagation. This can lead to a chain reaction of ignition, which can cause serious safety risks. Second, to solve these safety issues, a method of setting a long gap between the upper cell frame (20) and the lower cell frame (10) is used, but this leads to the problem of increasing the size of the entire module. This acts as a major constraint on the miniaturization of the battery module. Third, if the first coupling part (8) and the second coupling part (9) provided in each of the upper cell frame (2) and lower cell frame (4) currently in use have different shapes, it is inevitable to produce two types of separately designed cell frames, which increases the diversity of parts and complicates the assembly process. This may lead to a decrease in production efficiency and an increase in manufacturing costs. Fourth, a method of installing a screen sheet is being considered to prevent flame propagation between the upper cell frame and the lower cell frame in the event of battery cell ignition. However, in this case, it is difficult to stably fix the screen sheet after accurately positioning it in the area facing multiple battery cells, and even after fixing it, problems may arise where the screen sheet deviates from its proper position during the manufacturing process or is deformed by external impact, preventing it from fully performing its role as a screen. There