KR-102963272-B1 - Pouch-Type Battery Cell With Improved Thermal safety

KR102963272B1KR 102963272 B1KR102963272 B1KR 102963272B1KR-102963272-B1

Abstract

The present invention relates to a pouch-type battery cell with improved thermal safety, specifically comprising: an electrode assembly having a pair of electrode tabs on one or both sides; a cell case housing the electrode assembly; a pair of electrode leads, one side of which is connected to the electrode tabs and the other side of which protrudes outside the cell case; a lead film located between the cell case and the electrode leads; and a temperature fuse unit, wherein the temperature fuse unit operates to induce a short circuit when the temperature rises above a predetermined temperature.

Inventors

한현규

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260508
Application Date: 20211130

Claims (11)

An electrode assembly having a pair of electrode tabs on one or both sides; A cell case housing the above electrode assembly; A pair of electrode leads, one end of which is connected to the electrode tab and the other end of which protrudes outside the cell case; A lead film positioned between the cell case and the electrode lead; and Includes a temperature fuse section, When the temperature rises above a predetermined temperature, the temperature fuse unit operates to induce a short circuit, and The above cell case is a laminate structure composed of an outer resin layer, a metal layer, and an inner resin layer, and The above temperature fuse unit is composed of two parts, including a temperature fuse connected when the temperature rises above a predetermined temperature, a first cable extended by a predetermined length from one side of the temperature fuse, and a second cable extended by a predetermined length from the other side of the temperature fuse. A pouch-type battery cell characterized by one temperature fuse section connecting the positive electrode tab and the cell case metal layer, and another temperature fuse section connecting the negative electrode tab and the cell case metal layer.
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In paragraph 1, A pouch-type battery cell characterized in that the above-mentioned temperature fuse is located inside the cell case.
In paragraph 3, A pouch-type battery cell characterized by the above-mentioned temperature fuse being located near the electrode tab.
In paragraph 3, A pouch-type battery cell characterized in that the above-mentioned temperature fuse is in the form of being wrapped by a coating layer.
In paragraph 5, A pouch-type battery cell characterized in that the above-mentioned coating layer is made of a silicone material.
In paragraph 1, A pouch-type battery cell characterized in that the above-mentioned temperature fuse is located outside the cell case.
In Paragraph 7, A pouch-type battery cell characterized in that the above-mentioned temperature fuse is positioned in close contact with the outer surface of the cell case.
In paragraph 8, A pouch-type battery cell characterized in that the above-mentioned temperature fuse is fixed to the outer surface of the pocket portion of the cell case by an adhesive member.
In Paragraph 9, A pouch-type battery cell characterized in that the adhesive member is a thermally conductive material.
In paragraph 1, The cell case comprises an upper case, a lower case located below the upper case, and a sealing portion at the edge of the upper case and the lower case, wherein A pouch-type battery cell characterized by the sealing portion having three or four sides.

Description

Pouch-Type Battery Cell With Improved Thermal Safety The present invention relates to a pouch-type battery cell with improved thermal safety, and specifically, to a pouch-type battery cell with improved thermal safety capable of suppressing ignition, etc., by inducing an external short circuit when the internal temperature of the pouch-type battery cell rises abnormally. With the increasing technological development and demand for mobile devices, rechargeable secondary batteries are being used as an energy source for various mobile devices. Secondary batteries are also attracting attention as an energy source for electric vehicles and hybrid electric vehicles, which are being presented as alternatives to conventional gasoline and diesel vehicles that use fossil fuels. These secondary batteries include known lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. Depending on the shape of the battery case, they are classified into cylindrical and prismatic batteries, in which the electrode assembly is housed in a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is housed in a pouch-type case made of aluminum laminate sheets. Meanwhile, the operating voltage of a single unit battery cell is approximately 2.5V to 4.5V. Therefore, if a higher output voltage is required, multiple battery cells are connected in series to form a battery module or battery pack, or multiple battery cells are connected in parallel to form a battery module or battery pack depending on the required charge/discharge capacity. However, when multiple battery cells are connected, problems such as overload may occur. For example, problems such as the internal temperature of the battery module or battery pack rising due to overload, which amplifies the abnormal state of the battery, are occurring, and to solve these problems, a heat dissipation sheet or heat sink is provided to maintain the battery temperature within a predetermined range. However, even if cooling components such as heat dissipation sheets or heat sinks are provided, safety cannot be guaranteed if the temperature of the battery cell rises rapidly in a short period of time, so countermeasures related to this are required. FIG. 1 is a perspective view of a pouch-type battery cell according to a preferred first embodiment of the present invention. Figure 2 is an exploded view of the pouch-type battery cell of Figure 1 with the upper case separated. Figure 3 is a cross-sectional view showing the view cut along the line A-A' of Figure 1. FIG. 4 is a plan view showing a temperature fuse section according to a preferred first embodiment of the present invention. FIG. 5 is a conceptual diagram illustrating a method of connecting one side cable of a temperature fuse unit to a cell case according to a preferred first embodiment of the present invention. FIG. 6 is a perspective view of a pouch-type battery cell according to a preferred second embodiment of the present invention. Figure 7 is an exploded view of the pouch-type battery cell of Figure 6 with the upper case separated. Figure 8 is a cross-sectional view showing the cut along the line A-A' of Figure 6. Embodiments that enable a person skilled in the art to easily implement the present invention are described in detail below with reference to the attached drawings. However, in describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description is omitted. In addition, the same reference numerals are used for parts having similar functions and operations throughout the drawings. Throughout the specification, when a part is described as being connected to another part, this includes not only cases where they are directly connected, but also cases where they are indirectly connected with other elements in between. Furthermore, unless specifically stated otherwise, the inclusion of a certain component does not exclude other components but implies that additional components may be included. Hereinafter, a pouch-type battery cell with improved thermal safety according to the present invention will be described with reference to the attached drawings. FIG. 1 is a perspective view of a pouch-type battery cell according to a preferred first embodiment of the present invention, FIG. 2 is an exploded perspective view of the pouch-type battery cell of FIG. 1 with the upper case separated, and FIG. 3 is a cross-sectional view showing the cell cut along line A-A' of FIG. 1. As illustrated in FIGS. 1 to 3, the pouch-type battery cell according to the present invention comprises an electrode assembly (100), a cell case (200), an electrode lead (300), a lead film (400), and a temperature fuse part (500). First, the ele