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KR-102963179-B1 - A Battery Cell Having a Venting Gas Inducing Part On a Lead Film And a Battery Module Including It

KR102963179B1KR 102963179 B1KR102963179 B1KR 102963179B1KR-102963179-B1

Abstract

The present invention relates to a battery cell having a venting gas induction portion provided in a lead film and a battery module including the same. Specifically, the invention relates to a battery cell having a venting gas induction portion provided in a lead film 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 one or more molten portions having a pattern shape are formed in the lead film.

Inventors

  • 홍슬기

Assignees

  • 주식회사 엘지에너지솔루션

Dates

Publication Date
20260508
Application Date
20220225

Claims (12)

  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 includes lead films provided on the upper and lower surfaces, One or more molten portions having a pattern shape are formed in the above lead film, and A battery cell characterized in that the molten portion has a shape in which the width narrows from the inner edge of the lead film toward the outer direction.
  2. delete
  3. In paragraph 1, A battery cell characterized in that the melting temperature of the above-mentioned molten portion is lower than the melting temperature of the above-mentioned lead film.
  4. In paragraph 3, A battery cell characterized in that the molten part is a thermoplastic material.
  5. In paragraph 3, A battery cell characterized in that the above-mentioned molten part is a material having chemical resistance.
  6. In paragraph 3, A battery cell characterized by the above-mentioned molten portion comprising one or more of polyimide, polypropylene, polyethylene, polyethylene terephthalate, polyvinyl chloride, and high-density polyethylene.
  7. In paragraph 6, A battery cell characterized by the above-mentioned molten portion having a plasticizer added.
  8. In paragraph 1, A battery cell characterized by the above shape being triangular.
  9. In paragraph 1, A battery cell characterized by the above shape being semicircular.
  10. In paragraph 1, A battery cell characterized by the above-mentioned shape being a trapezoid.
  11. A battery module comprising a battery cell described in any one of claims 1, 3 through 10.
  12. A battery pack comprising the battery module described in paragraph 11.

Description

A battery cell having a venting gas inducing part on a lead film and a battery module including it The present invention relates to a battery cell having a venting gas induction portion provided on a lead film and a battery module including the same. Specifically, the invention relates to a battery cell having a venting gas induction portion provided on a lead film that can induce the direction of discharge of venting gas when gas is generated within a case by providing a melting portion that melts at a relatively lower temperature than the lead film on the lead film. 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, high-temperature heat or venting gas is generated in battery cells due to various causes such as overcharging, overcurrent, or external impact, and if the venting gas is not released outside the battery cell, the battery cell may explode, causing impact to nearby battery cells and resulting in secondary damage. FIG. 1 is a perspective view showing a battery cell according to the prior art. Referring to FIG. 1, the battery cell according to the prior art includes a pouch case (10), an electrode assembly (20) housed in the pouch case (10), an electrode lead (30) having one side of the electrode assembly (20) connected to the electrode assembly (20) and the other side protruding outward from the pouch case (10), and a sealant (40) surrounding the electrode lead (30), wherein a notch (41) is formed in the sealant (40). In a battery cell according to the prior art, when high temperature heat and venting gas are generated due to overcharging, overcurrent, and external impact in the electrode assembly (20) housed inside the battery cell, the notch (41) of the sealant (40) breaks and the venting gas is released to the outside, thereby preventing secondary damage. According to this conventional technology, the safety of the battery cell can be increased by releasing the venting gas when the venting gas is generated, but there is a problem that the sealing of the pouch case (10) is not formed in the part where the notch (41) is formed, so the sealing retention force may be reduced. FIG. 1 is a perspective view showing a battery cell according to the prior art. FIG. 2 is a top view of a battery cell according to a preferred first embodiment of the present invention. Figure 3 is a cross-sectional view showing a vertical cut along the line A-A' of Figure 2. Figure 4 is an enlarged perspective view of a lead film positioned in close contact with an electrode lead in the battery cell of Figure 2. FIG. 5 is a top view of a battery cell according to a preferred second embodiment of the present invention. FIG. 6 is a top view of a battery cell according to a preferred third 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 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 battery cell having a venting gas induction portion provided on a lead film according to the present invention and a battery module including the same will be described with reference to the attached drawings. FIG. 2 is a top view of a battery cell according to a preferred first embodiment of the present invention, FIG. 3 is a cross-sectional view taken vertically along line