Cooling plate injection joining method for electric vehicle battery case frame

Abstract

To provide a cooling plate injection joining method for an electric vehicle battery case frame.SOLUTION: A cooling plate injection joining method includes: a cooling plate preparation step in which an electric vehicle battery case and a cooling plate are prepared, and injection object fixing holes are formed in the battery case and the cooling plate; a mold mounting step in which the electric vehicle battery case and the cooling plate are pre-assembled and mounted on an injection mold to form a space communicating with an injection object fixing hole; an injection step in which a predetermined injection object material is injected into an injection molding space and the injection object fixing hole of the injection mold; and a joining completion step of removing the electric vehicle battery case from the injection mold.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cold plate injection joining method, and more particularly to a cold plate injection joining method for an electric vehicle battery case frame. [Background technology]

[0002] During the electric vehicle battery case production process, the battery case frame and the cooling plate are joined by welding as shown in FIG.

[0003] Specifically, the electric vehicle battery case frame, made of aluminum material, is joined to the cooling plate by FSW welding.

[0004] During production, the strong pressure and rotation, which are characteristics of FSW welding, can cause deformation of the product, which leads to problems with existing methods such as dimensional defects and high investment costs for FSW welding machines.

[0005] Therefore, there is a need for a technology that can solve the problems associated with the conventional technology mentioned above. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent Publication No. 10-1277453 (Registration Date: June 17, 2013) Summary of the Invention [Problem to be solved by the invention]

[0007] The object of the present invention is to provide a cooling plate injection joining method that can increase process efficiency by changing the joining process of a battery case frame and a cooling plate during the production process of an electric vehicle battery case, and reduce production costs and improve quality through structural improvement. [Means for solving the problem]

[0008] To achieve the above object, a cooling plate injection joining method for an electric vehicle battery case frame according to one aspect of the present invention is a method for joining a battery case frame and a cooling plate during an electric vehicle battery case production process, and may include a cooling plate preparation step of preparing the electric vehicle battery case and a cooling plate, and forming injection material fixing holes in the battery case and the cooling plate; a mold mounting step of pre-assembling the electric vehicle battery case and the cooling plate and mounting them on an injection mold to form an injection molding space of a predetermined volume that forms a space communicating with the injection material fixing holes; an injection step of filling the injection molding space and the injection material fixing holes of the injection mold with a predetermined injection material; and a joining completion step of removing the electric vehicle battery case from the injection mold.

[0009] In one embodiment of the present invention, the cooling plate preparing step may include a first fixing hole forming step of forming first fixing holes that are recessed from a portion of the electric vehicle battery case in contact with the cooling plate to a predetermined depth in a vertical direction inside the electric vehicle battery case and are continuously formed along an edge of an upper end surface of the electric vehicle battery case.

[0010] In one embodiment of the present invention, the cooling plate preparing step may include a second fixing hole forming step of forming a plurality of second fixing holes in a cooling plate contacting an upper surface of the electric vehicle battery case at positions corresponding to the first fixing holes and spaced apart from one another along an edge of an upper surface of the electric vehicle battery case.

[0011] In one embodiment of the present invention, the mold mounting step may include a fixing hole aligning step of mounting a cooling plate on an upper surface of the electric vehicle battery case, and then aligning and fixing a first fixing hole and a second fixing hole.

[0012] In one embodiment of the present invention, the mold mounting step may include: an injection mold inserting step of mounting the cooling plate and the electric vehicle battery case in the injection mold in a form surrounding an upper surface of the electric vehicle battery case on which the cooling plate is mounted; and an injection mold position fixing step of fixing a position of the injection mold by separating an upper surface of the cooling plate from an inner upper surface of the injection mold by a preset distance. Effect of the Invention

[0013] As described above, according to the cooling plate injection joining method for an electric vehicle battery case frame of the present invention, by including a cooling plate preparation step, a mold mounting step, an injection step, and a joining completion step that perform specific processes, the joining process of the battery case frame and the cooling plate can be changed during the electric vehicle battery case production process, thereby fundamentally preventing problems caused by welding deformation and increasing process efficiency. As a result, a cooling plate injection joining method can be provided that can reduce production costs and improve quality through structural improvement. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a process diagram illustrating a state in which a battery case frame and a cooling plate are joined during a production process of an electric vehicle battery case according to the prior art. [Diagram 2] 3 is a flowchart showing a cold plate injection bonding method according to an embodiment of the present invention. [Diagram 3] 3 is a flowchart specifically illustrating a mold mounting step of the cold plate injection bonding method of FIG. 2. [Figure 4] 3 is a cross-sectional view showing an electric vehicle battery case, a cooling plate, and an injection mold prepared by the cooling plate injection joining method according to one embodiment of the present invention of FIG. 2. [Diagram 5] 5 is a cross-sectional view showing a cooling plate injection joining structure completed by the structure shown in FIG. 4. [Figure 6] FIG. 3 is a cross-sectional view showing an electric vehicle battery case, a cooling plate, and an injection mold prepared by a cooling plate injection joining method according to still another embodiment of the present invention of FIG. 2. [Figure 7] FIG. 7 is a cross-sectional view showing a cooling plate injection joining structure completed by the structure shown in FIG. 6. [Figure 8] FIG. 3 is a cross-sectional view showing an electric vehicle battery case, a cooling plate, and an injection mold prepared by a cooling plate injection joining method according to still another embodiment of the present invention of FIG. 2. [Figure 9] FIG. 9 is a cross-sectional view showing a cooling plate injection joining structure completed by the structure shown in FIG. 8. [Figure 10] FIG. 3 is a cross-sectional view showing an electric vehicle battery case, a cooling plate, and an injection mold prepared by a cooling plate injection joining method according to still another embodiment of the present invention of FIG. 2. [Figure 11] FIG. 11 is a cross-sectional view showing a cooling plate injection joining structure completed by the structure shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. Prior to this, the terms and words used in the present specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as being consistent with the technical ideas of the present invention.

[0016] Throughout this specification, when a member is said to be "on" another member, this includes not only when the member is in contact with the other member, but also when there is another member between the two members. Throughout this specification, when a part is said to "include" a certain component, this does not mean to exclude other components, but means that the part may further include other components, unless otherwise specified.

[0017] FIG. 2 shows a flow chart illustrating a cold plate injection bonding method according to one embodiment of the present invention.

[0018] Referring to FIG. 2, the cooling plate injection joining method (S100) according to the present embodiment is a method for joining a battery case frame and a cooling plate 120 during the production process of an electric vehicle battery case 110, and includes a cooling plate preparation step (S110), a mold mounting step (S120), an injection step (S130), and a joining completion step (S140) that perform specific processes. This allows the joining process of the battery case frame and the cooling plate 120 during the production process of the electric vehicle battery case 110 to be changed to increase process efficiency, and the cooling plate injection joining method (S100) can be provided that can reduce production costs and improve quality through structural improvements.

[0019] Hereinafter, each step of the cooling plate injection bonding method (S100) according to the present embodiment will be described in detail with reference to the drawings.

[0020] FIG. 3 is a flow chart specifically illustrating the die mounting step of the cold plate injection bonding method of FIG. 2, and FIGS. 4 to 11 are process diagrams corresponding to each step.

[0021] 10 and 11, in the cooling plate preparation step (S110) according to the present embodiment, a battery case 110 for an electric vehicle and a cooling plate 120 are prepared, and injection fixing holes are formed in the battery case and the cooling plate 120.

[0022] Specifically, the cooling plate preparation step (S110) may include a first fixing hole forming step (S111) and a second fixing hole forming step (S113) that perform specific processes. The first fixing hole forming step (S111) performs a process of forming a first fixing hole 111 that is recessed from a portion of the electric vehicle battery case 110 that contacts the cooling plate 120 into the electric vehicle battery case 110 in a vertical direction by a predetermined depth and is continuously formed along the upper end surface edge of the electric vehicle battery case 110. The second fixing hole forming step (S113) performs a process of forming a plurality of second fixing holes that are formed in the cooling plate 120 that contacts the upper surface of the electric vehicle battery case 110, at positions corresponding to the first fixing holes 111, and are continuously spaced apart from each other along the upper end surface edge of the electric vehicle battery case 110.

[0023] In the mold mounting step (S120) according to this embodiment, the electric vehicle battery case 110 and the cooling plate 120 are pre-assembled and mounted in the injection mold 130, and a process of forming an injection molding space of a predetermined volume that forms a space communicating with the injection fixing hole is performed.

[0024] Specifically, the mold mounting step (S120) according to the present embodiment may include a fixing hole aligning step (S121), an injection mold inserting step (S122), and an injection mold position fixing step (S123) that perform specific steps. The fixing hole aligning step (S121) performs a process of mounting the cooling plate 120 on the upper surface of the electric vehicle battery case 110, fixing the cooling plate through the fixing gap 114 of the electric vehicle battery case 110, and aligning and fixing the positions of the first fixing hole 111 and the second fixing hole 121. The injection mold inserting step (S122) performs a process of mounting the cooling plate 120 on the injection mold 130 in a form surrounding the upper surface of the electric vehicle battery case 110 on which the cooling plate 120 is mounted, and the cooling plate 120 serves as a protective cover for the upper surface of the electric vehicle battery case 110. The injection mold position fixing step (S123) performs a process of fixing the position of the injection mold 130 by separating the upper surface of the cooling plate 120 from the inner upper surface of the injection mold 130 by a preset distance.

[0025] In the injection step (S130) according to this embodiment, the cooling plate 120 is mounted on the injection mold 130 in a form surrounding the upper surface of the electric vehicle battery case 110 on which the cooling plate 120 is mounted, and the cooling plate 120 serves as a protective cover for the upper surface of the electric vehicle battery case 110.

[0026] In the joining completion step (S140) according to this embodiment, a process of removing the electric vehicle battery case 110 from the injection mold 130 is performed.

[0027] 4 to 7, 10 and 11 are structures in which the injected material protects the cooling plate 120 and no separate undercover is required, whereas the structures disclosed in Figs. 8 and 9 are structures in which a separate undercover is required to protect the cooling plate 120.

[0028] FIG. 10 is a cross-sectional view showing an electric vehicle battery case, a cooling plate, and an injection mold prepared by a cold plate injection joining method according to yet another embodiment of the present invention, and FIG. 11 is a cross-sectional view showing a cold plate injection joining structure completed by the structure shown in FIG. 10.

[0029] Referring to these drawings, the injection mold 130 according to this embodiment may have a structure that completely surrounds the outer periphery of the electric vehicle battery case 110 and the outer periphery of the cooling plate 120. In this case, the injection material injected through the injection gate 131 of the injection mold 130 is injected into the outer periphery of the electric vehicle battery case 110 and the upper surface of the cooling plate 120 to form a structure, and the cooling plate 120 may be fixed to the electric vehicle battery case 110.

[0030] At this time, a fixing gap 140 capable of fixing the cooling plate 120 is formed in the frame of the electric vehicle battery case 110 having an aluminum profile structure, so that the cooling plate 120 and the frame of the electric vehicle battery case 110 can be stably fixed.

[0031] In this case, the injection material surrounds the aluminum frame and is also filled inside the profile structure frame, improving the strength of the entire structure, preventing water leakage, and ensuring a stable connection between each frame. In other words, the injection material plays a role of connecting the frames, as well as a role of an undercover and a role of connecting the cooling plate.

[0032] As described above, according to the cooling plate injection joining method (S100) for an electric vehicle battery case frame of the present invention, by performing specific processes including a cooling plate preparation step (S110), a mold mounting step (S120), an injection step (S130), and a joining completion step (S140), it is possible to provide a cooling plate injection joining method (S100) that can change the joining process of the battery case frame and the cooling plate 120 during the production process of the electric vehicle battery case 110 to increase process efficiency, reduce production costs through structural improvement, and improve quality.

[0033] Although the above detailed description of the present invention has been described with reference to only specific embodiments thereof, it is to be understood that the present invention is not limited to the specific forms set forth in the detailed description, but rather includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention as defined by the appended claims.

[0034] In other words, the present invention is not limited to the specific embodiments and explanations described above, and various modifications can be made by anyone having ordinary knowledge in the technical field to which the present invention belongs without departing from the gist of the present invention as claimed in the claims, and such modifications are within the scope of protection of the present invention. [Explanation of symbols]

[0035] S100: Cooling plate injection joining method S110: Cooling plate preparation stage S111: First fixed hole formation step S113: Second fixed hole formation step S120: Mold installation stage S121: Fixed hole alignment step S122: Injection mold insertion stage S123: Injection mold position fixing stage S130: Injection stage S140: Joining completion stage 110: Electric vehicle battery case 111: First fixed hole 112: Edge groove 114: Fixed gap 120: Cooling plate 121: Second fixed hole 130: Injection mold 131: Ejection gate 132:Groove forming part 140: Injection molding section

Claims

1. A method for joining a battery case frame and a cooling plate (120) during a production process of an electric vehicle battery case (110), comprising: A cooling plate preparation step (S110) of preparing the electric vehicle battery case (110) and a cooling plate (120) and forming injection fixing holes in the battery case and the cooling plate (120); A mold mounting step (S120) in which the electric vehicle battery case (110) and the cooling plate (120) are pre-assembled and mounted on the injection mold (130) to form an injection molding space of a predetermined volume that forms a space communicating with an injection fixing hole; An injection step (S130) of filling a predetermined injection material into the injection molding space and the injection material fixing hole of the injection mold (130); and The method for injection bonding a cooling plate includes a bonding completion step (S140) of removing the electric vehicle battery case (110) from the injection mold (130).

2. The cooling plate preparation step (S110) includes:

2. The cooling plate injection joining method according to claim 1, further comprising: a first fixing hole forming step (S111) of forming a first fixing hole (111) that is recessed to a predetermined depth in a vertical direction inside the electric vehicle battery case (110) from a portion of the electric vehicle battery case (110) that contacts the cooling plate (120) and is continuously formed along an upper end surface edge of the electric vehicle battery case (110).

3. The cooling plate preparation step (S110) includes:

3. The cooling plate injection joining method according to claim 2, further comprising: a second fixing hole forming step (S113) of forming a plurality of second fixing holes in the cooling plate (120) contacting the upper surface of the electric vehicle battery case (110) at positions corresponding to the first fixing holes (111) and continuously spaced at regular intervals along the edge of the upper surface of the electric vehicle battery case (110).

4. The mold mounting step (S120) includes:

4. The cooling plate injection joining method according to claim 3, further comprising: a fixing hole aligning step (S121) of mounting the cooling plate (120) on an upper surface of the electric vehicle battery case (110), fixing the cooling plate through a fixing gap (114) of the electric vehicle battery case (110), and aligning and fixing the positions of a first fixing hole (111) and a second fixing hole (121).

5. The mold mounting step (S120) includes: An injection mold inserting step (S122) in which the cooling plate (120) is mounted on the injection mold (130) in a form surrounding the upper surface of the mounted electric vehicle battery case (110) so that the cooling plate (120) serves as a protective cover for the upper surface of the electric vehicle battery case (110); and 5. The method of claim 4, further comprising: an injection mold position fixing step (S123) of fixing the position of the injection mold (130) by separating the upper surface of the cooling plate (120) from an inner upper surface of the injection mold (130) by a preset distance.

6. The injection step (S130) includes: Injection bonding the upper surface of the cooling plate (120) and the fixed gap (114); 6. The method of claim 5, further comprising filling the injection material into the injection molding space and the injection material fixing hole of the injection mold (130) with a predetermined injection material, and also filling the fixing gap (114) of the cooling plate (120) with the injection material.

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