Battery pack

Abstract

A battery pack including a plurality of battery modules according to an embodiment of the present invention may include a case, a partition wall partitioning the inside of the case into a plurality of compartments, a plurality of battery modules disposed in the plurality of compartments, a cover covering the plurality of compartments above the partition wall, and a flameproof sheet disposed between the partition wall and the cover and deforming in form according to the movement of the cover.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0097612, filed on August 4, 2022, and all of the contents disclosed in the document of the Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a battery pack including a flame retardant sheet.

Background Art

[0003] In response to environmental pollution and depletion of oil resources, research and development on power generation based on environmentally friendly energy sources are being conducted. In particular, research on secondary batteries is actively underway, and research is being conducted from various viewpoints such as materials, structures, processes, and systems of secondary batteries.

[0004] From a structural perspective, secondary batteries can be managed in modules and packs. Secondary battery cells gather to form a battery module, and battery modules gather to form a battery pack. During the charge and discharge process of secondary batteries, a large amount of gas may be generated or ignition may occur in the secondary battery cells, and stability management related to this is necessary.

[0005] According to the prior art, when the lead (or cover) expands due to the gas internal pressure of the battery pack, the compartment structure of the module is released, and there is a risk of increased danger due to the generation of a flow path through which flame or gas can diffuse.

Summary of the Invention

Problems to be Solved by the Invention

[0006] The problem to be solved by the present invention is to provide a battery pack in which the compartment structure can be maintained even when the cover moves due to an increase in the internal pressure of the battery pack.

Means for Solving the Problems

[0007] A battery pack including a plurality of battery modules according to an embodiment of the present invention may include a case, a partition wall partitioning the interior of the case into a plurality of compartments, a plurality of battery modules disposed in the plurality of compartments, a cover covering the plurality of compartments above the partition wall, and a flame retardant sheet whose form is deformed according to the movement of the cover between the partition wall and the cover.

Advantages of the Invention

[0008] According to a preferred embodiment of the present invention, the compartment structure can be maintained even when the structure is deformed due to an increase in internal pressure.

[0009] According to a preferred embodiment of the present invention, it is possible to prevent flames or gas from diffusing through the flow path formed by the structural deformation.

Brief Description of the Drawings

[0010]

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Modes for Carrying Out the Invention

[0011] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention can be realized in several different forms and is not limited or restricted by the following embodiments.

[0012] To clearly explain the present invention, detailed descriptions of parts not related to the explanation or related known technologies that may unnecessarily obscure the gist of the present invention are omitted, and when adding reference signs to the components of each drawing in this specification, the same or similar reference signs are assigned to the same or similar components throughout the specification.

[0013] Also, the terms or words used in this specification and the claims should not be construed as being limited to their customary or dictionary meanings. In accordance with the principle that the inventor can appropriately define the concept of the terms in order to explain his own invention in the best way, they should be construed as meanings and concepts consistent with the technical idea of the present invention.

[0014] FIG. 1 is a perspective view of a battery pack 1 according to an embodiment of the present invention, and FIG. 2 is a plan view of the battery pack 1 with the cover 40 omitted according to an embodiment of the present invention.

[0015] The battery pack 1 can include a plurality of battery modules 2. The battery module 2 can be provided inside the battery pack 1 so as to be electrically connectable to the outside of the battery pack 1.

[0016] Referring to FIG. 1, the battery pack 1 can include a case 10. The case 10 can form a part of the appearance of the battery pack 1. For example, the case 10 can form the lower and side portions of the battery pack 1.

[0017] The battery pack 1 can include a cover 40. The cover 40 can cover the open upper part of the case 10. For example, the cover 40 can be arranged in a form that covers the upper part of the case 10. In other words, the cover 40 can cover a plurality of compartments 30 described later above the partition wall 20 described later.

[0018] The case 10 and the cover 40 can define an internal space in which the battery module 2 can be accommodated. For example, the case 10 forms the side and lower parts of the battery pack 1, and the cover 40 can form the upper part of the battery pack 1 while covering the open upper part of the case 10. The space surrounded by the case 10 and the cover 40 can form an internal space in which the battery module 2 can be accommodated.

[0019] The battery pack 1 can include a plurality of compartments 30. For example, the plurality of compartments 30 may be formed to accommodate the battery module 2 in the internal space of the battery pack 1 and to accommodate each of the battery modules 2 in an independent space.

[0020] The battery pack 1 can include a partition wall 20. For example, the partition wall 20 can partition the inside of the case 10 into a plurality of compartments 30. In other words, the partition wall 20 can be arranged in a form that crosses the internal space of the battery pack 1 so that the inside of the battery pack 1 (or the case 10) is partitioned (or divided) into a plurality of compartments 30.

[0021] The battery module 2 can be arranged (or accommodated) in a plurality of compartments 30. For example, each of the battery modules 2 may be arranged in each of the plurality of compartments 30, but is not limited thereto.

[0022] The battery pack 1 can include a flame retardant sheet 50. The flame retardant sheet 50 can be disposed between the partition wall 20 and the cover 40. For example, the flame retardant sheet 50 may be disposed along the upper portion of the partition wall 20 between the partition wall 20 and the cover 40. In other words, the flame retardant sheet 50 can be coupled to each of the partition wall 20 and the cover 40 between the partition wall 20 and the cover 40. By being disposed along the upper portion of the partition wall 20, the flame retardant sheet 50 can suppress the transition of flames or gas between the plurality of compartments 30.

[0023] FIG. 3 is a side view showing the arrangement of the flame retardant sheet 50 according to an embodiment of the present invention, and FIG. 4 is a side view showing the morphological deformation of the flame retardant sheet 50 according to an embodiment of the present invention.

[0024] The flame retardant sheet 50 can be attached to the partition wall 20 and the cover 40. For example, the upper sheet portion 50-1 of the flame retardant sheet 50 may be attached to the cover 40. Also, the lower sheet portion 50-2 of the flame retardant sheet 50 may be attached to the partition wall 20. The flame retardant sheet 50 can be installed in a folded state. For example, the flame retardant sheet 50 may be installed in a folded state under pressure by the partition wall 20 and the cover 40 between the partition wall 20 and the cover 40.

[0025] The battery pack 1 can include an upper adhesive member 61 and a lower adhesive member 62. For example, the upper adhesive member 61 and the lower adhesive member 62 may be double-sided tapes. The upper adhesive member 61 can attach the flame retardant sheet 50 (or the upper sheet portion 50-1) to the cover 40. The lower adhesive member 62 can attach the flame retardant sheet 50 (or the lower sheet portion 50-2) to the partition wall 20.

[0026] The flame retardant sheet 50 can be deformed in shape. For example, the flame retardant sheet 50 can be deformed in shape according to the movement of the cover 40 between the partition wall 20 and the cover 40. The flame retardant sheet 50 can be provided in a corrugated or folded state between the partition wall 20 and the cover 40. As a specific example, when the cover 40 moves upward due to the increase in the internal pressure of the plurality of compartments 30 by the plurality of battery modules 2, the flame retardant sheet can be expanded upward. By expanding the flame retardant sheet 50, even when the cover 40 moves upward, the movement of flame or gas between the plurality of compartments 30 can be suppressed. In other words, the flame retardant sheet 50 can prevent the diffusion of flame or gas through the flow path formed by the structural deformation between the compartments 30.

[0027] FIG. 5 is a side view of the battery pack 1a according to another embodiment of the present invention, FIG. 6 is a side view showing the arrangement of the flame retardant sheet 50a according to another embodiment of the present invention, and FIG. 7 is a side view showing the morphological deformation of the flame retardant sheet 50a according to another embodiment of the present invention.

[0028] The battery pack 1a can include an extension portion 21a. For example, the extension portion 21a may be a portion extending from the partition wall 20a. Specifically, the extension portion 21a can extend upward so as to penetrate the cover 40a from the partition wall 20a.

[0029] The battery pack 1a can include a support member 22a. For example, the support member 22a may be attached to the extension portion 21a. The support member 22a can be attached in a form surrounding the extension portion 21a.

[0030] The support member 22a can be attached to the extension part 21a and provided so as to support the cover 40a from above. For example, the cover 40a may be located between the support member 22a and the flameproof sheet 50a. The support member 22a can be attached to the extension part 21a so as to be able to support the cover 40a from above such that the movement of the cover 40a is suppressed to a predetermined extent. In this case, when the cover 40a moves upward, the support member 22a can suppress the movement of the cover 40a to a predetermined extent.

[0031] The flameproof sheet 50a can be fitted into the extension part 21a. For example, the flameproof sheet 50a may be formed with holes penetrating in the vertical direction so as to be fitted into the extension part 21a. In other words, the flameproof sheet 50a can be folded or expanded according to the movement of the cover 40a in a state where it is fitted into the extension part 21a.

[0032] The flameproof sheet 50a can be expanded or folded along the extension direction of the extension part 21a. For example, the upper part 50-1a of the sheet of the flameproof sheet 50a may be attached to the cover 40a, and the lower part 50-2a of the sheet may be attached to the partition wall 20a. When the cover 40a moves upward due to an increase in internal pressure by a plurality of battery modules 2, the flameproof sheet 50a can be expanded along the extension direction of the extension part 21a (e.g., upward from the partition wall 20a). Or, among the sections where the flameproof sheet 50a is expanded, a section expanded along the extension direction of the extension part 21a can be included. The flameproof sheet 50a can be expanded or folded along the extension direction of the extension part 21a according to the movement of the cover 40a in a state where it is fitted into the extension part 21a. Even when the cover 40a is lifted due to an increase in internal pressure, the movement of flame or gas between a plurality of compartments (e.g., 30) can be suppressed by the blocking of the flameproof sheet 50a.

[0033] FIG. 8 is a side view of a battery pack 1a in which an increase in internal pressure has occurred according to another embodiment of the present invention.

[0034] When the cover 40a is lifted due to the increase in internal pressure by the battery module 2, the support member 22a can support (or pressurize) the cover 40a from above to suppress the movement of the cover 40a. When a greater increase in internal pressure occurs due to the battery module 2, the support member 22a may detach from the extension portion 21a. Even in this case, the flame retardant sheet 50a can be spread along the moving cover 40a. Since the flame retardant sheet 50a is spread or folded in response to the movement of the cover 40a, it is possible to block the movement paths of flames and gases between the compartments 30.

[0035] Between a plurality of compartments (e.g., 30) inside the battery packs 1, 1a, when the lead (or cover) expands due to internal pressure and the compartment structure is released, a flow path through which flames or gases can diffuse may be generated, increasing the risk. The flame retardant sheets 50, 50a can maintain the compartment structure even when the structure is deformed due to an increase in internal pressure as described above. Thereby, since the diffusion of flames or gases through the flow path formed by the structural deformation is prevented, the stability of the battery packs 1, 1a can be improved.

[0036] As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereby, and various implementations are possible within the scope of the technical idea of the present invention and the equivalent scope of the claims described below by those having ordinary knowledge in the technical field to which the present invention pertains.

Explanation of Reference Numerals

[0037] 1, 1a: Battery pack 2: Battery module 10, 10a: Case 20, 20a: Partition wall 21, 21a: Extension portion 22, 22a: Support member 30, 30a: A plurality of compartments 40, 40a: Cover 50, 50a: Flame retardant sheet 50-1, 50-1a: Sheet upper part 50-2, 50-2a: Lower part of the sheet 61: Upper bonding member 62: Lower bonding member

Claims

1. A battery pack including a plurality of battery modules, comprising: a case; a partition wall partitioning the interior of the case into a plurality of compartments; a plurality of battery modules disposed in the plurality of compartments; a cover covering the plurality of compartments above the partition wall; a battery pack including a flame retardant sheet disposed between the partition wall and the cover and deforming in form according to the movement of the cover.

2. The battery pack according to claim 1, wherein the flame retardant sheet is installed in a folded state between the partition wall and the cover.

3. The flame retardant sheet is: The battery pack according to claim 1, which is spread upward when the cover moves upward due to an increase in internal pressure caused by the plurality of battery modules.

4. The flame retardant sheet is: an upper sheet portion attached to the cover; The battery pack according to any one of claims 1 to 3, including a lower sheet portion attached to the partition wall.

5. The flame retardant sheet is: The battery pack according to any one of claims 1 to 3, which is disposed along the upper portion of the partition wall to suppress the transition of flame or gas between the plurality of compartments.

6. The battery pack according to any one of claims 1 to 3, further including an upper adhesive member for attaching the flame retardant sheet to the cover and a lower adhesive member for attaching the flame retardant sheet to the partition wall.

7. The flame retardant sheet is: The battery pack according to any one of claims 1 to 3, which suppresses the movement of flame or gas between the plurality of compartments.

8. The battery pack according to any one of claims 1 to 3, further including an extension portion extending upward so as to penetrate the cover from the partition wall and a support member attached to the extension portion and supporting the cover from above.

9. The flame retardant sheet is: The battery pack according to claim 8, in which a hole penetrating in the vertical direction is formed so as to be fitted into the extension portion.

10. The flame retardant sheet is: The upper part is attached to the cover, The lower part is attached to the partition wall, The battery pack according to claim 9, which is spread along the extension direction of the extension portion when the cover moves upward due to an increase in internal pressure caused by the plurality of battery modules. ​ ​

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