KR-102963049-B1 - Pouch-type Battery Cell Having Gas Venting Function And Battery Module Including It

Abstract

The present invention relates to a pouch-type battery cell equipped with a gas venting function and a battery module including the same. Specifically, the invention relates to a pouch-type battery cell and a battery module including the same, comprising: a case made of a laminate sheet including an inner resin layer, a metal layer, and an outer resin layer; an electrode assembly housed in the case; an electrode tab located on the side of the electrode assembly; an electrode lead having one side connected to the electrode tab and the other side protruding to the outside of the case; and a lead film provided on the upper and lower surfaces of the electrode lead, wherein a gas release inducing film is interposed between the electrode lead and the lead film, or between the inner resin layer of the case and the lead film.

Inventors

• 강태영

Assignees

• 주식회사 엘지에너지솔루션

Dates

Publication Date

20260511

Application Date

20220816

Priority Date

20220204

Claims (13)

1. A case made of a laminate sheet comprising an inner resin layer, a metal layer, and an outer resin layer; Electrode assembly housed in the above case; Electrode tab located on the side of the electrode assembly; One side of an electrode lead connected to the electrode tab and the other side protruding to the outside of the case; and The electrode lead comprises lead films provided on the upper and lower surfaces of the electrode lead, A gas release inducing film is interposed between the electrode lead and the lead film, or between the internal resin layer of the case and the lead film, and The melting temperature of the gas release inducing film is lower than the melting temperature of the internal resin layer of the case or the melting temperature of the lead film, and A pouch-type battery cell characterized in that the gas release inducing film is positioned in a strip shape along the width direction of the lead film and is located only in a portion of the area between the electrode lead and the lead film, wherein one edge overlaps with the edge of the lead film located inside the case, while the other edge does not extend to the other edge of the lead film .
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3. In paragraph 1, A pouch-type battery cell characterized in that the above gas release-inducing film comprises one or more of polypropylene, polyethylene, polyethylene acrylic acid, polybutylene, polyurethane, and polyimide.
4. In paragraph 1, A pouch-type battery cell characterized in that the above-mentioned gas release-inducing film is a chemical-resistant material.
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10. In paragraph 1, A pouch-type battery cell characterized in that the area of the gas release inducing film is equal to or smaller than the portion where the case and the lead film overlap.
11. In paragraph 1, A pouch-type battery cell characterized in that the above gas release inducing film is interposed between the electrode lead and the lead film, and between the internal resin layer of the case and the lead film.
12. A battery module comprising a pouch-type battery cell as described in any one of claims 1, 3, 4, and 10 to 11.
13. A battery pack comprising the battery module described in paragraph 12.

Description

Pouch-type battery cell having gas venting function and battery module including it The present invention relates to a pouch-type battery cell equipped with a gas venting function and a battery module including the same. Specifically, the invention relates to a pouch-type battery cell equipped with a gas venting function and a battery module including the same, wherein a film that melts at a relatively lower temperature than the lead film and the internal resin layer of the case is provided in the sealing portion where the electrode lead is located, thereby enabling the rapid release of gas from the case and further inducing the direction of release. Recently, the demand for rechargeable batteries capable of storing generated electrical energy is increasing due to air pollution caused by the use of fossil fuels and the development of alternative energy sources resulting from energy depletion. Rechargeable rechargeable batteries are being closely utilized in daily life, such as in mobile devices, electric vehicles, and hybrid electric vehicles. Rechargeable batteries, which serve as an indispensable energy source for various electronic devices in modern society, are seeing increased capacity requirements due to the growing usage and complexity of mobile devices and the development of electric vehicles. While multiple battery cells are arranged in small devices to meet user demand, vehicles utilize battery modules that electrically connect multiple battery cells, or battery packs equipped with multiple such modules. Meanwhile, thermal runaway can occur in battery cells due to various causes such as overcharging, overcurrent, or external impact. In other words, the temperature of the battery cell rises abnormally, triggering a chemical reaction and consequently generating a large amount of gas. Consequently, if the generated gas is not released quickly, the battery cell may explode, which can cause secondary damage by impacting nearby battery cells. FIG. 1 is a plan view showing a battery cell according to the prior art. Referring to FIG. 1, the battery cell according to the prior art comprises a cell case (10), an electrode assembly (20) housed in the cell case (10), an electrode tab (30) located on the side of the electrode assembly (20), an electrode lead (40) having one side connected to the electrode tab (30) and the other side protruding outward from the cell case (10), a lead film (50) located on the upper and lower surfaces of the electrode lead (40), and a gas discharge tube (60) embedded in the lead film (50). In the conventional battery cell, when high-temperature heat and gas are generated in the electrode assembly (20) housed inside the battery cell due to overcharging, overcurrent, and external impact, the gas is discharged to the outside through the gas discharge pipe (60) to prevent secondary damage. According to this conventional technology, the safety of the battery cell can be increased by releasing gas when an event occurs, but the lead film (50) must be unnecessarily large due to the gas release tube (60), and since the gas release tube (60) relies on the adhesive strength of the lead film (50), the gas release tube (60) may detach when an external impact is applied, and as a result, the overall sealing strength may be reduced. In particular, since a pressure greater than the sealing force of the lead film (50) is required for gas to be discharged through the gas discharge pipe (60) when an event occurs, it may be difficult to discharge before a large amount of gas is generated. FIG. 1 is a plan view of a battery cell according to the prior art. FIG. 2 is a plan view of a battery cell according to a preferred first embodiment of the present invention. Figure 3 is a cross-sectional view enlarged by cutting part A of Figure 2. FIG. 4 is a plan view of a battery cell according to a preferred second embodiment of the present invention. Figure 5 is a cross-sectional view enlarged by cutting part B of Figure 4. FIG. 6 is a plan view of a battery cell according to a preferred third embodiment of the present invention. Figure 7 is a cross-sectional view enlarged by cutting section C of Figure 6. FIG. 8 is a plan view of a battery cell according to a preferred fourth embodiment of the present invention. FIG. 9 is a plan view of a battery cell according to a preferred fifth embodiment of the present invention. FIG. 10 is a cross-sectional view of a portion of a battery cell according to a preferred sixth embodiment of the present invention. FIG. 11 is a cross-sectional view of a portion of a battery cell according to a preferred seventh embodiment of the present invention. 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