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KR-20260065304-A - Battery Lower Case

KR20260065304AKR 20260065304 AKR20260065304 AKR 20260065304AKR-20260065304-A

Abstract

The present invention relates to a battery bottom case and achieves the effect of guaranteeing the corresponding performance of products with a sealed design that fundamentally prevents moisture penetration, which causes bottom corrosion, through End of Life (EOL) inspection.

Inventors

  • 방석준
  • 허승
  • 오미선
  • 이채은

Assignees

  • 현대자동차주식회사
  • 기아 주식회사

Dates

Publication Date
20260508
Application Date
20241101

Claims (7)

  1. A cooling plate comprising a cooling top plate having an air inlet formed on one side, and a cooling bottom plate having a cooling channel formed therein, with an inlet port formed at one end of the cooling channel penetrating the cooling top plate and an outlet port formed at the other end penetrating the cooling top plate; and A lower housing having a shape corresponding to the above cooling plate and welded to the above cooling plate; including, Battery bottom case.
  2. In paragraph 1, The above cooling plate is, An inlet port insertion hole in which the inlet port is inserted on the above-mentioned side; and A discharge port insertion hole formed on one side thereof into which the discharge port is inserted, Battery bottom case.
  3. In paragraph 1, The outer surface of the inlet port and the circumference of the inlet port insertion hole are welded together, and The outer surface of the discharge port and the circumference of the discharge port insertion hole are welded together. Battery bottom case.
  4. In paragraph 1, The above cooling plate is, A first weld formed on the edge; Includes more, The above cooling plate is, A second weld formed on the edge; Includes more, The lower housing above is, A third weld formed on the edge; including, Battery bottom case.
  5. In paragraph 1, The above air inlet is, A welded wing portion is formed on the outer surface, and The above welded wing portion is, welded to the above cooling plate, Battery bottom case.
  6. In paragraph 4, The above first to third welds are Joined by brazing welding while overlapping each other Battery bottom case.
  7. In paragraph 1, The above air inlet is, A cooling top plate formed thereon, and formed on the inner side of a frame member provided around the upper perimeter of the cooling top plate. Battery bottom case.

Description

Battery Lower Case The present invention relates to a battery lower case. Secondary batteries, which possess electrical characteristics such as high energy density and high applicability across product groups, are widely applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric sources. These secondary batteries are attracting attention as a new energy source for enhancing eco-friendliness and energy efficiency, not only for the primary advantage of drastically reducing the use of fossil fuels but also because they generate no by-products from energy consumption. A high-voltage battery system is defined as a collection of battery cells, which are assemblies of electrodes, assembled into a battery with the capacity required by an electric vehicle. It typically consists of multiple battery cells, various metal components that support them, and components such as connection boards and foam pads that establish electrical connections between individual cells. Recently, various additional components are being added to meet requirements such as thermal runaway and wireless communication. The cooling plate for cooling the electric vehicle battery is manufactured through a brazing process of a flat top plate and a bottom plate forming a flow path, and forms the bottom of the case through welding with the frame member; a lower case is assembled underneath to protect it. In conventional bottom cases, if airtightness is not maintained between the cooling plate mounted on the lower end of the battery module and the bottom plate, moisture may penetrate and cause corrosion of the cooling plate. To prevent these problems, a method is used to seal the cooling plate and bottom plate by welding to prevent moisture penetration; however, in the current structure, it is difficult to conduct airtightness tests on the bottom case through welding, so a solution is needed to resolve this issue. The matters described above as background technology are intended only to enhance understanding of the background of the present invention and should not be construed as an acknowledgment that they constitute prior art already known to those skilled in the art. FIG. 1 is an exploded view of a battery case including a battery lower case according to an embodiment of the present invention. FIG. 2 is a drawing illustrating an air inlet provided in the cooling plate of a battery lower case according to an embodiment of the present invention. FIG. 3 is a drawing illustrating a cooling top plate, a cooling bottom plate, and a bottom housing of a battery bottom case according to an embodiment of the present invention. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Terms including ordinal numbers, such as “first,” “second,” etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. The term “and/or” is used to include any combination of the multiple items in question. For example, “A and/or B” means including all three cases, such as “A,” “B,” and “A and B.” When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. In the description of the embodiments, the statement that each layer (film), region, pattern, or structure is formed "on" or "under" the substrate, each layer (film), region, pad, or pattern includes both direct formation and formation through another layer. The criteria for "on" or "under" are based on the appearance depicted in the drawings for convenience and are used merely to indicate the relative positional relationship between components for convenience; they should not be understood as limiting the actual positions of the components. For example, "on B" merely indicates that B is depicted on A in the drawings unless otherwise stated or if, due to the attributes of A or B, A must be positioned on B. In actual products, B may be positioned under A, or B and A may be arranged side by side. Additionally, the thickness or size of each layer (film), region, pattern, or structure in the drawings may be modified for clarity and convenience of explanation, so they do not fully reflect the actual size. The terms used in thi