Search

US-12617134-B2 - Cooling plate injection bonding method for electric vehicle battery case frame

US12617134B2US 12617134 B2US12617134 B2US 12617134B2US-12617134-B2

Abstract

Disclosed is a method of bonding a battery case frame and a cooling plate in a process of producing an electric vehicle battery case, including a cooling plate preparation operation of preparing the electric vehicle battery case and the cooling plate and forming injection part fixing holes in the battery case and the cooling plate, a mold seating operation of temporarily assembling the electric vehicle battery case and the cooling plate, seating the temporarily assembled electric vehicle battery case and cooling plate in an injection mold, and forming an injection molding space communicating with the injection part fixing holes and having a predetermined volume, an injection operation of filling the injection molding space of the injection mold and the injection part fixing holes with a preset injection material, and a bonding completion operation of separating the electric vehicle battery case from the injection mold.

Inventors

  • Byungchan KIM

Assignees

  • Byungchan KIM

Dates

Publication Date
20260505
Application Date
20240726
Priority Date
20231102

Claims (6)

  1. 1 . A cooling plate injection bonding method of bonding a battery case frame and a cooling plate ( 120 ) in a process of producing an electric vehicle battery case ( 110 ), the cooling plate injection bonding method comprising: a cooling plate preparation operation (S 110 ) of preparing the electric vehicle battery case ( 110 ) and the cooling plate ( 120 ) and forming injection part fixing holes in the battery case and the cooling plate ( 120 ); a mold seating operation (S 120 ) of temporarily assembling the electric vehicle battery case ( 110 ) and the cooling plate ( 120 ), seating the temporarily assembled electric vehicle battery case ( 110 ) and cooling plate ( 120 ) in an injection mold ( 130 ), and forming an injection molding space communicating with the injection part fixing holes and having a predetermined volume; an injection operation (S 130 ) of filling the injection molding space of the injection mold ( 130 ) and the injection part fixing holes with a preset injection material; and a bonding completion operation (S 140 ) of separating the electric vehicle battery case ( 110 ) from the injection mold ( 130 ).
  2. 2 . The cooling plate injection bonding method of claim 1 , wherein the cooling plate preparation operation (S 110 ) includes a first fixing hole forming operation (S 111 ) of forming first fixing holes ( 111 ) recessed in the electric vehicle battery case ( 110 ) to a predetermined depth from portions of the cooling plate ( 120 ) in contact with the electric vehicle battery case ( 110 ) in a vertical direction of the electric vehicle battery case ( 110 ) and consecutively formed along an edge of an upper end surface of the electric vehicle battery case ( 110 ).
  3. 3 . The cooling plate injection bonding method of claim 2 , wherein the cooling plate preparation operation (S 110 ) includes a second fixing hole forming operation (S 113 ) of forming a plurality of second fixing holes which are consecutively formed in the cooling plate ( 120 ) in contact with an upper surface of the electric vehicle battery case ( 110 ) at locations corresponding to the first fixing holes ( 111 ) and spaced a predetermined interval from each other along the edge of the upper end surface of the electric vehicle battery case ( 110 ).
  4. 4 . The cooling plate injection bonding method of claim 3 , wherein the mold seating operation (S 120 ) includes a fixing hole aligning operation (S 121 ) of mounting the cooling plate ( 120 ) on the upper surface of the electric vehicle battery case ( 110 ), fixing the cooling plate using a fixing gap ( 114 ) of the electric vehicle battery case ( 110 ), aligning locations of the first fixing holes ( 111 ) and the second fixing holes ( 121 ), and fixing the first fixing holes ( 111 ) and the second fixing holes ( 121 ).
  5. 5 . The cooling plate injection bonding method of claim 4 , wherein the mold seating operation (S 120 ) includes: an injection mold insertion operation (S 122 ) of seating the cooling plate ( 120 ) and the electric vehicle battery case ( 110 ) in the injection mold ( 130 ) in a form in which the cooling plate ( 120 ) surrounds the upper surface of the electric vehicle battery case ( 110 ) on which the cooling plate ( 120 ) is mounted such that the cooling plate ( 120 ) serves as a protection cover for the upper surface of the electric vehicle battery cover ( 110 ); and an injection mold location fixing operation (S 123 ) of fixing a location of the injection mold ( 130 ) such that an upper surface of the cooling plate ( 120 ) is spaced a preset distance from an inner upper surface of the injection mold ( 130 ).
  6. 6 . The cooling plate injection bonding method of claim 5 , wherein, in the injection operation (S 130 ): the upper surface of the cooling plate ( 120 ) and the fixing gap ( 114 ) are injection bonded; and the injection molding space of the injection mold ( 130 ) and the injection part fixing holes are filled with a preset injection material, and the fixing gap ( 114 ) is filled with the injection material at the same time.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority from Korean Patent Application No. 10-2023-0149892, filed on Nov. 2, 2023 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. BACKGROUND 1. Field The following description relates to a cooling plate injection bonding method, and more specifically, to a cooling plate injection bonding method for an electric vehicle battery case frame. 2. Description of Related Art In a process of producing an electric vehicle battery case, a battery case frame and a cooling plate are bonded by welding as illustrated in FIG. 1. Specifically, an electric vehicle battery case frame formed of an aluminum material is bonded to a cooling plate by friction stir welding (FSW). Since a product is deformed due to a high pressure and rotation which are characteristics of the FSW during production, there are problems that dimensions of the product are incorrect due to the existing method, and a high investment cost for an FSW welding apparatus is incurred. Accordingly, there is a need for a technology for solving the problems due to the above-described conventional technology. Patent Document (Patent Document 1) Korean Registered Patent Publication No. 10-1277453 (Date of Registration: Jun. 17, 2013) SUMMARY Embodiments of the present invention are directed to providing a cooling plate injection bonding method capable of improving process efficiency by changing a bonding process of a battery case frame and a cooling plate in a process of producing an electric vehicle battery case frame and reducing a production cost and improving quality by improving a structure. In one aspect of the present invention, a cooling plate injection bonding method for an electric vehicle battery case frame is a method of bonding a battery case frame and a cooling plate in a process of producing an electric vehicle battery case and includes a cooling plate preparation operation of preparing the electric vehicle battery case and the cooling plate and forming injection part fixing holes in the battery case and the cooling plate, a mold seating operation of temporarily assembling the electric vehicle battery case and the cooling plate, seating the temporarily assembled electric vehicle battery case and cooling plate in an injection mold, and forming an injection molding space communicating with the injection part fixing holes and having a predetermined volume, an injection operation of filling the injection molding space of the injection mold and the injection part fixing holes with a preset injection material, and a bonding completion operation of separating the electric vehicle battery case from the injection mold. In one embodiment of the present invention, the cooling plate preparation operation may include a first fixing hole forming operation of forming first fixing holes recessed in the electric vehicle battery case to a predetermined depth from portions of the cooling plate in contact with the electric vehicle battery case in a vertical direction of the electric vehicle battery case and consecutively formed along an edge of an upper end surface of the electric vehicle battery case. In one embodiment of the present invention, the cooling plate preparation operation may include a second fixing hole forming operation of forming a plurality of second fixing holes which are consecutively formed in the cooling plate in contact with an upper surface of the electric vehicle battery case at locations corresponding to the first fixing holes and spaced a predetermined interval from each other along the edge of the upper end surface of the electric vehicle battery case. In one embodiment of the present invention, the mold seating operation may include a fixing hole aligning operation of mounting the cooling plate on the upper surface of the electric vehicle battery case, aligning locations of the first fixing holes and the second fixing holes, and fixing the first fixing holes and the second fixing holes. In one embodiment of the present invention, the mold seating operation may include an injection mold insertion operation of seating the cooling plate and the electric vehicle battery case in the injection mold in a form in which the cooling plate surrounds the upper surface of the electric vehicle battery case and an injection mold location fixing operation of fixing a location of the injection mold such that an upper surface of the cooling plate is spaced a preset distance from an inner upper surface of the injection mold. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view illustrating a process of bonding a battery case frame and a cooling plate in a process of producing an electric vehicle battery case. FIG. 2 is a flowchart illustrating a cooling plate injection bonding method according to one embodiment of the present invention. FIG. 3 is a flowchart specifically illustrating a mold seating operation of the coo