Assembled battery tray and assembly method thereof

Abstract

The present invention discloses an assembled battery tray and an assembly method thereof, comprising a frame longitudinal beam and a frame transverse beam for enclosing a frame. The frame frame is provided with a tray bottom plate on an inner circle, the tray bottom plate comprises a plurality of spliced ​​bottom plates which are sequentially spliced ​​in the length direction of the frame longitudinal beam, a welding carrier bar corresponding to the spliced ​​bottom plate is provided on the frame longitudinal beam along the length direction, the spliced ​​bottom plate comprises a welding plastic deformation body corresponding to the welding carrier bar on the side wall facing the frame longitudinal beam, the welding plastic deformation body is guided and slidably assembled in the direction of the frame longitudinal beam relative to the welding carrier bar, and a weld based on a sliding plane is formed between the welding carrier bar and the welding plastic deformation body, and the weld positions can be made to be on the same plane through the guided and slidably assembled of a plurality of spliced ​​bottom plates and the welding carrier bar.

Description

Technical Field

[0001] The invention belongs to the field of battery trays, and in particular relates to an assembled battery tray and an assembly method thereof. Background Art

[0002] The battery tray is used to install and support the battery pack. It consists of a frame and a tray bottom plate. The edge of the tray bottom plate is assembled and welded to the frame. However, since the tray bottom plate is a large-area integral structure, the deformation of the bottom plate itself is difficult to guarantee, so that the weld position at the edge of the bottom plate cannot be completely on the same plane in the normal direction of the bottom plate. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an assembled battery tray and an assembly method thereof, which can form a weld based on a sliding plane through a plurality of spliced ​​bottom plates and a welding carrier bar guide sliding assembly, so that the weld positions are on the same plane.

[0004] Technical solution: To achieve the above purpose, the technical solution of the present invention is as follows:

[0005] An assembled battery tray comprises a frame longitudinal beam and a frame transverse beam for enclosing a frame. The frame frame is provided with a tray bottom plate on the inner circle. The tray bottom plate comprises a plurality of spliced ​​bottom plates which are spliced ​​in sequence in the length direction of the frame longitudinal beam. The frame longitudinal beam is provided with a welding carrier bar corresponding to the spliced ​​bottom plate along the length direction. The spliced ​​bottom plate comprises a welding plastic deformation body corresponding to the welding carrier bar on the side wall facing the frame longitudinal beam. The welding plastic deformation body is guided and slidably assembled relative to the welding carrier bar in the direction of the frame longitudinal beam, and a weld based on a sliding plane is formed between the welding carrier bar and the welding plastic deformation body.

[0006] Furthermore, the welding plastic deformation body includes an inner plastic deformation strip located in the inner cavity of the battery tray and an outer plastic deformation strip located at the bottom of the battery tray. The inner plastic deformation strip and the outer plastic deformation strip are arranged in parallel and spaced apart in the normal direction of the splicing base plate, and form a welding groove that can be used for the movable embedding of the welding carrier strip.

[0007] Furthermore, the side surfaces of the welding carrier strip facing the inner plastic deformation strip and the outer plastic deformation strip are fusion welding carrier surfaces, and the side surfaces of the inner plastic deformation strip and the outer plastic deformation strip corresponding to the fusion welding carrier surfaces are fusion welding surfaces. A welding surface parallel to the spliced ​​base plate is formed between the fusion welding carrier surfaces and the fusion welding surfaces. In the welding state, at least one of the fusion welding surfaces is attached and bonded to the fusion welding carrier surface in a molten state.

[0008] Furthermore, the outer plastic deformation strip is subjected to thermoplastic deformation and collapses on the welding carrier strip, and the fusion welding surface corresponding to the outer plastic deformation strip is fusion welded to the welding carrier strip.

[0009] Furthermore, the inner plastic deformation strip and the welding carrier strip are independently arranged in close contact.

[0010] Furthermore, the welding carrier strip includes a compensation surface between two groups of fusion welding carrier surfaces, the bottom surface of the welding groove is parallel to the compensation surface and the gap is set to the compensation surface, and a compensation gap is formed between the compensation surface and the bottom surface of the groove.

[0011] Furthermore, a receiving groove is concavely provided on one side of the compensation surface corresponding to the outer plastic deformation strip, and the receiving groove is connected to the welding carrier surface corresponding to the outer plastic deformation strip, and the receiving groove receives and holds the molten material.

[0012] Furthermore, the welding plastic body is made of the same material as the spliced ​​bottom plate and is an integrally formed structure.

[0013] A method for assembling an assembled battery tray comprises the following steps:

[0014] S1: Place two sets of frame longitudinal beams in the same plane with parallel spacing;

[0015] S2: Slide each spliced ​​bottom plate in turn between two sets of frame longitudinal beams through the welding carrier strip guide, and form a pallet bottom plate by splicing a plurality of spliced ​​bottom plates;

[0016] S3: welding the assembled bottom plates and frame longitudinal beams to form a whole. During the welding process, the welding plastic deformation is heated to a temperature close to and lower than the melting point of the welding plastic deformation. Meanwhile, the heat is transferred to the welding carrier bar, and the welding plastic deformation is heated until the welding plastic deformation undergoes plastic deformation and collapses on the welding carrier bar.

[0017] S4: applying an extrusion force in the normal direction of the spliced ​​bottom plate, so that the weld plastic deformation body in the collapsed state and the weld carrier bar are squeezed and contacted with each other, and the two are bonded and attached to each other on the contact surface. After the predetermined extrusion time, the weld plastic deformation body and the weld carrier bar are naturally cooled;

[0018] S5: Assemble the frame cross beam with the two frame longitudinal beams respectively to enclose a ring-shaped frame, and weld the enclosed frame, the pallet bottom plate, and the pallet bottom plate and the frame cross beam.

[0019] Furthermore, only the outer plastic deformation strip is heated, so that the outer plastic deformation strip undergoes plastic deformation and collapses on the welding carrier strip, and the inner plastic deformation strip is deformed to be in close contact with the welding carrier strip by applying a normal load.

[0020] Beneficial effect: The present invention uses multiple splicing base plates and welding carrier strips for guiding sliding assembly. After the splicing is completed, the splicing base plates are welded to the welding carrier strips, and the welding surface is a sliding plane, thereby being able to form a weld based on the sliding plane, so that the weld positions are on the same plane. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0022] Attached Figure 2 It is a three-dimensional schematic diagram of the present invention from a top perspective in an assembled state;

[0023] Attached Figure 3 It is a schematic diagram of the structure enlargement of the local A of the present invention;

[0024] Attached Figure 4 It is a three-dimensional schematic diagram of the bottom view of the present invention in an assembled state;

[0025] Attached Figure 5 It is a schematic diagram of the structure enlargement of part B of the present invention;

[0026] Attached Figure 6 It is a schematic diagram of the structure enlargement of the local C of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] As attached Figure 1 To Attachment Figure 6 As shown, an assembled battery tray includes a frame longitudinal beam 1 and a frame cross beam 2 for enclosing a frame, the frame frame inner circle is provided with a tray bottom plate, the tray bottom plate includes a plurality of splicing bottom plates 3 sequentially spliced ​​in the length direction of the frame longitudinal beam 1, the opposite surfaces of adjacent splicing bottom plates are splicing surfaces 6, the splicing surfaces 6 are continuous concave and convex surfaces, the splicing surfaces of two adjacent splicing bottom plates are butted and fitted with each other, the frame longitudinal beam 1 is provided with a welding carrier strip 4 corresponding to the splicing bottom plate 3 along the length direction, the welding carrier strip 4 is used as a reference position for welding, and the splicing bottom plate 3 is facing The side wall toward the frame longitudinal beam 1 includes a welding plastic deformation body 5 corresponding to the welding carrier bar 4. The welding plastic deformation body 5 is guided and slidably assembled relative to the welding carrier bar 4 in the direction of the frame longitudinal beam. A plurality of splicing base plates 3 are guided and slidably assembled with the welding carrier bar 4. The splicing base plates 3 are welded to the welding carrier bar after splicing to form a fused whole after assembly, wherein the welding surface is a sliding plane. Since the splicing base plates are guided and slid relative to the sliding plane, a weld based on the sliding plane is formed between the welding carrier bar and the welding plastic deformation body, so that the welds are on the same plane.

[0029] The welding plastic deformation body 5 includes an inner plastic deformation strip 11 located in the inner cavity of the battery tray and an outer plastic deformation strip 11 located at the bottom of the battery tray. The inner plastic deformation strip 11 and the outer plastic deformation strip 12 are arranged at parallel intervals in the normal direction of the splicing base plate 3, and form a welding groove that can be used for the welding carrier bar 4 to be movably embedded. The splicing base plate 3 is guided and slid by the welding groove and the welding carrier bar 4, and is also self-positioned in the normal direction of the splicing base plate through the welding groove and the welding carrier bar, without the need for additional positioning tooling.

[0030] As attached Figure 3 and attached Figure 6 As shown, the side of the welding carrier strip 4 facing the inner plastic deformation strip 11 and the outer plastic deformation strip 11 is the fusion welding carrier surface 4a, and the side of the inner plastic deformation strip 11 and the outer plastic deformation strip 11 corresponding to the fusion welding carrier surface is the fusion welding surface, and the fusion welding carrier surface and the fusion welding surface constitute a welding surface parallel to the spliced ​​bottom plate. In the prior art, the edge contour of the tray bottom plate and the inner wall of the frame frame are welded by stirring welding, and the formed welding surface is parallel to the normal of the tray bottom plate, and the weld is subjected to the same force direction as the bottom plate, which is more prone to fatigue cracking. In this solution, the welding surface is parallel and coplanar with the bottom plate, and the force direction of the bottom plate loaded with the battery pack is perpendicular to the welding surface, which can greatly reduce the fatigue cracking phenomenon at the weld and ensure its welding stability.

[0031] In the welded state, at least one of the weld surfaces is attached to and bonded to the weld carrier surface in a molten state, or both weld surfaces are welded to the weld carrier surface 4 a.

[0032] Preferably, the outer plastic deformation strip 12 is plastically deformed by heat and collapses on the welding carrier strip 5, and only the fusion welding surface corresponding to the outer plastic deformation strip 12 is fusion welded to the welding carrier strip. The outer plastic deformation strip 12 and the welding carrier strip are welded to form a weld, so that the spliced ​​bottom plate 3 and the frame longitudinal beam can be connected and their connection strength can be guaranteed. The weld located at the bottom of the pallet can also be waterproof to prevent the aqueous solution from penetrating into the gap between the spliced ​​bottom plate and the frame longitudinal beam.

[0033] The several spliced ​​bottom plates 3 and the frame longitudinal beams 1 are welded to form a whole. During the welding process, the welding plastic deformation body 5 is heated, and the heating temperature is close to and lower than the melting point temperature of the welding plastic deformation body. At the same time, the heat is transferred to the welding carrier bar 4, and the heating is performed until the welding plastic deformation body undergoes plastic deformation and collapses on the welding carrier bar 4.

[0034] An extrusion force is applied in the normal direction of the spliced ​​base plate, so that the collapsed welding plastic deformation body 5 and the welding carrier bar 4 are squeezed and contacted with each other, and the two are bonded and attached to each other on the contact surface. After the predetermined extrusion time, the welding plastic deformation body and the welding carrier bar are allowed to cool naturally.

[0035] The inner plastic deformation strip 11 and the welding carrier strip 4 are independently fitted and contacted, that is, the inner plastic deformation strip 11 and the welding carrier strip 4 are not welded, and the sliding contact surface for relative sliding during assembly is still maintained. The inner plastic deformation strip 11 constitutes a limit strip and is supported by the welding carrier strip 4 to ensure the supporting strength of the bottom plate on the frame longitudinal beam. At the same time, the independent fitting contact between the two parts can also provide deformation compensation space for the deformation of the spliced ​​bottom plate or the frame longitudinal beam during use, and can also release deformation stress after welding.

[0036] Only the outer plastic deformation strip 12 is heated, so that the outer plastic deformation strip 12 is plastically deformed and collapsed on the welding carrier strip 4, and the inner plastic deformation strip 11 is deformed to be in close contact with the welding carrier strip 4 by applying a normal load.

[0037] The welding carrier strip 4 includes a compensation surface 4b located between two groups of fusion welding carrier surfaces 4a. The bottom surface of the welding groove is parallel to the compensation surface 4b and a gap is set at the compensation surface 4b. A compensation gap is formed between the compensation surface 4b and the bottom surface of the groove, which is used to provide a deformation compensation space for the deformation of the spliced ​​bottom plate or the frame longitudinal beam, thereby reducing the shear force on the weld seam during deformation.

[0038] A plurality of accommodating grooves 7 are recessed on one side of the compensation surface 4b corresponding to the outer plastic deformation strip 12, and the accommodating grooves 7 are connected to the fusion welding carrier surface corresponding to the outer plastic deformation strip 12. During welding, external force squeezes the outer plastic deformation body 12, so that the material body of the outer plastic deformation body is deformed and squeezed into the accommodating grooves 7. The accommodating grooves 7 receive and accommodate the molten molten material, which can increase the welding contact area. At the same time, spot welding can also be performed on the side of the splicing base plate facing the compensation surface, thereby increasing the welding position different from the direction of the fusion welding surface 4a. The planes where the plurality of spot welding points formed by the plurality of splicing base plates 3 in the length direction of the welding carrier strip and the weld plane where the fusion welding carrier surface 4a are located are located on two mutually perpendicular walls of the welding carrier strip, which can bear transverse shear force and longitudinal load, thereby greatly improving the welding strength.

[0039] The welding plastic deformation body 5 is made of the same material as the splicing base plate 3, such as aluminum, and the welding plastic deformation body 5 and the splicing base plate 3 are an integrally formed structure, which ensures their integrity and integrity and improves their overall strength after assembly.

[0040] A method for assembling an assembled battery tray comprises the following steps:

[0041] S1: placing two sets of frame longitudinal beams 1 in parallel and at a distance in the same plane;

[0042] S2: sequentially guide and slide each spliced ​​bottom plate 3 between two sets of frame longitudinal beams through the welding carrier strip, and a plurality of spliced ​​bottom plates 3 are spliced ​​together to form a pallet bottom plate;

[0043] S3: welding the assembled bottom plates 3 and the frame longitudinal beams 1 to form a whole. During the welding process, the welding plastic deformation 5 is heated to a temperature close to and lower than the melting point of the welding plastic deformation. At the same time, the heat is transferred to the welding carrier bar 4, and the welding plastic deformation is heated until the welding plastic deformation undergoes plastic deformation and collapses on the welding carrier bar 4.

[0044] S4: applying an extrusion force in the normal direction of the spliced ​​bottom plate, so that the weld plastic deformation 5 in the collapsed state and the weld carrier strip 4 are squeezed and contacted with each other, and the two are mutually bonded and attached on the contact surface. After the predetermined extrusion time, the weld plastic deformation and the weld carrier strip are naturally cooled;

[0045] S5: Assemble the frame cross beam 2 with the two frame longitudinal beams respectively to enclose a ring-shaped frame, and weld the enclosed frame, the pallet bottom plate, and the pallet bottom plate and the frame cross beam.

[0046] Furthermore, only the outer plastic deformation strip 12 is heated, so that the outer plastic deformation strip 12 undergoes plastic deformation and collapses on the welding carrier strip 4 , and the inner plastic deformation strip 11 is deformed to be in close contact with the welding carrier strip 4 by applying a normal load.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An assembled battery tray, comprising a frame longitudinal beam (1) and a frame transverse beam (2) for enclosing a frame, wherein the inner circle of the frame is provided with a tray bottom plate, characterized in that: The pallet bottom plate comprises a plurality of spliced ​​bottom plates (3) spliced ​​in sequence in the length direction of the frame longitudinal beam (1); a welding carrier strip (4) corresponding to the spliced ​​bottom plates (3) is arranged on the frame longitudinal beam (1) along the length direction; a welding plastic deformation member (5) corresponding to the welding carrier strip (4) is included on the side wall of the spliced ​​bottom plate (3) facing the frame longitudinal beam (1); the welding plastic deformation member (5) is guided and slidably assembled relative to the welding carrier strip (4) in the direction of the frame longitudinal beam, and a weld based on a sliding plane is formed between the welding carrier strip and the welding plastic deformation member; The welding plastic deformation body (5) comprises an inner plastic deformation strip (11) located in the inner cavity of the battery tray and an outer plastic deformation strip (12) located at the bottom of the battery tray, wherein the inner plastic deformation strip (11) and the outer plastic deformation strip (12) are arranged in parallel with each other in the normal direction of the splicing bottom plate (3) and form a welding groove capable of being used for the movable embedding of the welding carrier strip (4); The side of the welding carrier strip (4) facing the inner plastic deformation strip (11) and the outer plastic deformation strip (12) is a fusion welding carrier surface (4a), and the side of the inner plastic deformation strip (11) and the outer plastic deformation strip (12) corresponding to the fusion welding carrier surface is a fusion welding surface, and the fusion welding carrier surface and the fusion welding surface form a welding surface parallel to the splicing bottom plate. In the welding state, at least one of the fusion welding surfaces is attached to and bonded to the fusion welding carrier surface in a molten state; The outer plastic deformation strip (12) is plastically deformed by heat and collapses onto the welding carrier strip (4), and the fusion welding surface corresponding to the outer plastic deformation strip (12) is fusion welded onto the welding carrier strip.

2. The assembled battery tray according to claim 1, characterized in that: The inner plastic deformation strip (11) and the welding carrier strip (4) are independently arranged in close contact with each other.

3. The assembled battery tray according to claim 1, characterized in that: The welding carrier strip (4) includes a compensation surface (4b) located between two groups of fusion welding carrier surfaces (4a); the bottom surface of the welding groove is parallel to the compensation surface (4b) and a gap is set at the compensation surface (4b); a compensation gap is formed between the compensation surface (4b) and the bottom surface of the groove.

4. The assembled battery tray according to claim 3, characterized in that: A receiving groove (7) is concavely provided on a side of the compensation surface (4b) corresponding to the outer plastic deformation strip (12), and the receiving groove (7) is connected to the welding carrier surface corresponding to the outer plastic deformation strip (12), and the receiving groove (7) receives and contains the molten material.

5. The assembled battery tray according to claim 1, characterized in that: The welding plastic body (5) and the spliced ​​bottom plate (3) are made of the same material and are an integrally formed structure.

6. The method for assembling an assembled battery tray according to claim 1, characterized in that: The following steps are involved: S1: placing two sets of frame longitudinal beams (1) in a parallel spacing manner in the same plane; S2: sequentially slide each spliced ​​bottom plate (3) between two sets of frame longitudinal beams through the guide of the welding carrier strip, and form a pallet bottom plate by splicing a plurality of spliced ​​bottom plates (3); S3: welding the assembled bottom plates (3) and the frame longitudinal beams (1) to form a whole. During the welding process, the welding plastic deformation (5) is heated to a temperature close to but lower than the melting point of the welding plastic deformation. At the same time, heat is transferred to the welding carrier bar (4) and the welding plastic deformation is heated until the welding plastic deformation undergoes plastic deformation and collapses on the welding carrier bar (4). S4: applying an extrusion force in the normal direction of the spliced ​​bottom plate, so that the weld plastic deformation (5) in the collapsed state and the weld carrier strip (4) are mutually extruded and contacted, and the two are mutually bonded and attached on the contact surface. After the extrusion is performed for a predetermined time, the weld plastic deformation and the weld carrier strip are naturally cooled; S5: Assemble the frame cross beam (2) with the two frame longitudinal beams to form a ring-shaped frame, and weld the frame frame, the tray bottom plate, and the tray bottom plate and the frame cross beam.

7. The method for assembling an assembled battery tray according to claim 6, characterized in that: In step S3, only the outer plastic deformation strip (12) is heated, so that the outer plastic deformation strip (12) undergoes plastic deformation and collapses on the welding carrier strip (4), and the inner plastic deformation strip (11) is deformed to be in close contact with the welding carrier strip (4) by applying a normal load.

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