KR-20260062792-A - BATTERY MODULE COMPRISING A DEVICE FOR PREVENTING VENTING

KR20260062792AKR 20260062792 AKR20260062792 AKR 20260062792AKR-20260062792-A

Abstract

The present invention relates to a battery module comprising a plurality of pouch-type battery cells, each comprising an electrode assembly, a storage portion for housing the electrode assembly, a terrace portion forming the edge of the storage portion, and a sealing portion located outside the terrace portion, wherein a guide portion having a predetermined shape is interposed between the pouch-type battery cells, and one side of the guide portion is positioned to extend to the vicinity of the sealing portion.

Inventors

박윤우
배상현

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20250429
Priority Date: 20241029

Claims (11)

A battery module comprising a plurality of pouch-type battery cells, each comprising an electrode assembly, a storage portion for housing the electrode assembly, a terrace portion forming the edge of the storage portion, and a sealing portion located outside the terrace portion. A battery module characterized by having a guide portion having a predetermined shape interposed between the above pouch-type battery cells, wherein one side of the guide portion is positioned to extend to the vicinity of the sealing portion.
In paragraph 1, A battery module characterized in that one side of the guide portion extends to the boundary point of the sealing portion and the terrace portion.
In paragraph 2, A battery module characterized in that the above guide portion is positioned with respect to the sealing portion in the direction in which the electrode lead of the pouch-type battery cell protrudes.
In paragraph 3, A battery module characterized in that the guide member is positioned on one side and/or the other side of the sealing portion.
In paragraph 2, A battery module characterized in that the distance between one surface of the guide portion facing the sealing portion and one surface of the sealing portion among the guide portions is smaller than the depth of the storage portion.
In paragraph 2, A battery module characterized by the corner portion of the guide portion having a rounded shape with a predetermined radius of curvature.
In paragraph 2, A battery module characterized by the above guide portion being positioned between the sealing portions of a pair of pouch-type battery cells located adjacent to each other.
In Paragraph 7, A battery module characterized by the above guide portion simultaneously facing the sealing portions of a pair of pouch-type battery cells located adjacent to each other.
In paragraph 2, A battery module characterized by the above guide portion having a cuboid shape.
A battery pack comprising a battery module according to any one of claims 1 to 9.
A device comprising a battery module according to any one of claims 1 to 9.

Description

Battery module comprising a guide section for preventing venting The present invention relates to a battery module including a guide portion for preventing venting, and more specifically, to a battery module including a guide portion capable of preventing or delaying venting of a pouch-type battery cell sealing portion when a pouch-type battery cell expands. Rechargeable batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, etc. Generally, the operating voltage of a rechargeable battery unit cell is about 2.0V to 5.0V, and if a higher output voltage is required, a cell assembly can be formed by connecting multiple unit cells in series. Considering the output voltage and capacity, a battery module can be formed by connecting cell assemblies in series and/or parallel, and a battery pack can be manufactured using multiple battery modules. Meanwhile, secondary batteries can be classified into cylindrical, prismatic, and pouch types depending on the shape of the battery case. Among these, the pouch type is attracting significant attention due to its ability to be stacked with high integration density, high energy density per unit weight, low cost, and ease of deformation. A pouch-type battery cell refers to a battery cell in which the battery case is made of a laminated sheet, and the electrode assembly is embedded inside the battery case. Since gas is generated inside battery cells during usage processes such as charging and discharging, potentially causing the battery case to expand and explode, various technologies are being proposed to enhance the safety of pouch-type battery cells. FIG. 1 is an enlarged cross-sectional view of a part of a battery module according to the prior art, and FIG. 2 is a drawing for explaining the case where gas is generated inside a pouch-type battery cell housed in a battery module according to the prior art. Referring to FIGS. 1 and 2, a plurality of pouch-type battery cells (100) housed inside a module case (not shown) are electrically connected to a bus bar (210) provided in an ICB assembly (200). When gas is generated inside the pouch-type battery cell (100) and the internal pressure increases, the sealing portion (40) may be deformed or damaged as the storage portion (20) that houses the electrode assembly and the terrace portion (30) that forms the edge of the storage portion (20) expand. In this regard, Patent Document 1 relates to a pouch-type battery cell including a venting control means for a sealing portion, wherein a venting control means is provided in the direction in which an electrode lead protrudes from the sealing portion of a pouch-type battery case, and the venting control means controls the opening and closing of the sealing portion according to the internal gas pressure of the pouch-type battery case. In the case of Patent Document 1, there is a separate means for controlling the opening and closing of the sealing portion itself, and the opening and closing means maintains the seal by physical compression rather than conventional thermal compression. In order to use the venting control means, individual precise mechanical design considering the material, strength, etc., of each pouch-type battery case is required. Patent Document 2 includes a guard unit installed facing at least a portion of the terrace portion and at least a portion of the sealing portion to delay damage to the sealing portion of the battery cell. The guard unit of Patent Document 2 has a shape facing more than half of the total length of the terrace portion and the sealing portion with respect to the longitudinal direction of the battery cell. In the case of Patent Document 2, in accordance with the general common sense that the supporting force increases when a large portion is physically supported, the guard unit is limited to facing more than half of the total length of the terrace portion and the ceiling portion. However, when a guard unit according to Patent Document 2 is added, the volume that expands in the terrace section, etc. is limited, so the overall volume that can expand is reduced. In other words, due to the limited total volume, the internal pressure of the battery cell may increase more quickly. FIG. 1 is an enlarged cross-sectional view of a part of a battery module according to the prior art. FIG. 2 is a diagram illustrating the case where gas is generated inside a pouch-type battery cell housed in a battery module according to the prior art. Figure 3 is a plan view illustrating a pouch-type battery cell. FIG. 4 is an enlarged cross-sectional view of a part of a battery module according to one embodiment of the present invention. FIG. 5 is a cross-sectional perspective view of a battery module according to one embodiment of the present invention. FIG. 6 is a conceptual diagram illustrating a guide portion constituting a battery module according to one embodiment of the present inve