阅读说明：本技术 一种用于型材集成电池包下箱体的搅拌摩擦焊工艺 (Friction stir welding process for lower box body of profile integrated battery pack ) 是由 黄铁兴 林桂树 杨礼昌 叶章 卢辉 于 2021-08-05 设计创作，主要内容包括：本发明公开了电池包箱体生产技术领域一种用于型材集成电池包下箱体的搅拌摩擦焊工艺,包括焊接使用的搅拌头,引流块,及焊接工艺参数；所述工艺技术通过结合产品结构,选用特定的搅拌头,以及特定的焊接参数,结合引流块引流,实现型材集成液冷箱端部焊接密封；从而避免人工焊接缺陷引起的产品质量问题,极大程度的提高此类型材集成电池下箱体的安全性；有利于本发明的推广。(The invention discloses a friction stir welding process for a lower box body of a profile integrated battery pack, belonging to the technical field of battery pack box body production, and comprising a stirring head, a drainage block and welding process parameters, wherein the stirring head, the drainage block and the welding process parameters are used for welding; the process technology combines a product structure, selects a specific stirring head and specific welding parameters, and combines drainage of a drainage block to realize welding and sealing of the end part of the profile integrated liquid cooling tank; thereby avoiding the product quality problem caused by the defect of manual welding and greatly improving the safety of the lower box body of the section integrated battery; is beneficial to the popularization of the invention.)

1. The utility model provides a friction stir welding technology that is used for box under section bar integrated battery package, includes liquid cooling bottom plate subassembly (2) and the drainage piece that shutoff subassembly, inside were equipped with the cooling chamber, its characterized in that: the method comprises the following steps:

s1, splicing the plugging component, the liquid cooling bottom plate component (2) and the drainage block into a whole by using a clamp, and closing an opening (21) of a cooling cavity of the liquid cooling bottom plate component (2) by the plugging component;

s2, arranging a drainage block at the connection terminal of the plugging assembly and the liquid cooling bottom plate assembly (2);

s3, the plugging component, the liquid cooling bottom plate component (2) and the drainage block are connected into a whole through spot welding;

s4, pricking the stirring friction welding head (8) into the welded workpiece;

s5, the friction stir welding head (8) rotates to penetrate through the plane along the track of the connecting line and moves to the drainage block to realize welding;

s6, repeating the steps S4-S5 to weld the plugging assembly and the connecting line on the other side of the liquid cooling bottom plate assembly (2);

and S7, cutting and removing the drainage block after welding.

2. The friction stir welding process for the lower box body of the profile integrated battery pack according to claim 1, characterized in that: and in the step S4, the depth of the stirring needle of the friction stir welding head (8) penetrating into the liquid cooling bottom plate assembly (2) is more than half of the thickness of the liquid cooling bottom plate assembly (2), and the shaft shoulder of the friction stir welding head (8) is pressed down to 0.2mm-0.4mm below the upper surface of the liquid cooling bottom plate assembly (2).

3. The friction stir welding process for the lower box body of the profile integrated battery pack according to claim 2, characterized in that: the rotating speed of the friction stir welding head is 1000-.

4. The friction stir welding process for the lower box body of the profile integrated battery pack according to claim 3, wherein the friction stir welding process comprises the following steps: the plugging assembly is provided with a protruding portion (9) which is connected into a whole, and the protruding portion (9) is matched with an opening (21) of a cooling cavity of the liquid cooling bottom plate assembly (2) in shape.

Technical Field

The invention relates to the technical field of battery box production, in particular to a friction stir welding process for a lower box of a profile integrated battery pack.

Background

Friction stir welding is widely applied to various materials, and welding of low-melting-point metals and alloys such as aluminum and magnesium, copper alloys, titanium alloys, steel materials, metal matrix composite materials and dissimilar metals (aluminum/copper, aluminum/magnesium, aluminum/steel and the like) has been successfully realized at present.

At present, the liquid cooling integrated battery box used in the field of commercial vehicles and passenger vehicles mainly comprises a traditional section bar process and an independent liquid cooling plate and FDS locking process.

The existing section liquid cooling integration scheme usually uses a cavity of a section as a liquid cooling circulation flow channel to achieve the effect of cooling a lower box body of a battery; the adopted process is friction stir welding and argon arc welding. The process has the defects of manual work, and the leakage risk exists at the manual ladle welding position.

Based on the technical scheme, the invention designs a friction stir welding process for the lower box body of the profile integrated battery pack to solve the problems.

Disclosure of Invention

The invention aims to provide a friction stir welding process for a lower box body of a profile integrated battery pack, which aims to solve the problem of the risk of liquid leakage at the manual pack welding position in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a friction stir welding technology that is used for box under section bar integrated battery package, includes plugging component, inside liquid cooling bottom plate subassembly and the drainage piece that is equipped with the cooling chamber, includes following steps:

s1, splicing the plugging assembly, the liquid cooling bottom plate assembly and the drainage block into a whole by using a clamp, and closing an opening of a cooling cavity of the liquid cooling bottom plate assembly by the plugging assembly;

s2, arranging a drainage block at the connection terminal of the plugging assembly and the liquid cooling bottom plate assembly;

s3, the plugging component, the liquid cooling bottom plate component and the drainage block are connected into a whole through spot welding;

s4, pricking the friction stir welding head into the workpiece to be welded;

s5, the friction stir welding head rotates to penetrate through the plane along the track of the connecting line and moves to the drainage block to realize welding;

s6, repeating the steps S4-S5 to weld the plugging assembly and the connecting line on the other side of the liquid cooling bottom plate assembly;

and S7, cutting and removing the drainage block after welding.

Preferably, the depth of the stirring needle of the friction stir welding head penetrating into the liquid-cooled bottom plate assembly in the step S4 is more than half of the thickness of the liquid-cooled bottom plate assembly, and the shaft shoulder of the friction stir welding head is pressed to be 0.2mm-0.4mm below the upper surface of the liquid-cooled bottom plate assembly.

Preferably, the rotating speed of the friction stir welding head is 1000-.

Preferably, the plugging assembly is provided with a protruding part which is connected into a whole, and the protruding part is matched with the opening shape of the cooling cavity of the liquid cooling bottom plate assembly.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the penetrating drainage friction stir welding process is used on the box body liquid cooling floor assembly, so that the influence of artificial factors on the product sealing performance is reduced, and the liquid cooling integrated box is safer and more reliable; is beneficial to the popularization of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a side view of the welding process of the present invention;

FIG. 3 is a schematic view illustrating the welding effect of the present invention;

FIG. 4 is a schematic view of a friction stir welding head of the present invention penetrating into a workpiece to be welded;

FIG. 5 is an enlarged view of part A-A of FIG. 1;

FIG. 6 is a schematic view of the opening structure of the liquid-cooled bottom plate assembly and the protrusion of the front blocking cross member according to the present invention.

1. A front plugging beam; 2. a liquid cooled base plate assembly; 21. an opening; 3. the frame is blocked at the back; 4. a drainage block; 5. a drainage block; 6. a drainage block; 7. a drainage block; 8. a friction stir welding head; 9. a raised portion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The utility model provides a friction stir welding technology that is used for box under section bar integrated battery package, includes plugging component, inside liquid cooling bottom plate subassembly 2 and the drainage piece that is equipped with the cooling chamber, includes following step:

s1, splicing the plugging component, the liquid cooling bottom plate component 2 and the drainage block into a whole by using a clamp, and closing the opening 21 of the cooling cavity of the liquid cooling bottom plate component 2 by the plugging component;

s2, arranging the drainage block in the plugging assembly and the liquid cooling bottom plate assembly 2 connection terminal;

s3, the plugging component, the liquid cooling bottom plate component 2 and the drainage block are connected into a whole through spot welding;

s4, pricking the stirring friction welding head 8 into the welded workpiece;

s5, the stirring friction welding head 8 rotates to penetrate through the plane along the track of the connecting line and moves to the drainage block to realize welding;

s6, repeating the steps S4-S5 to weld the plugging assembly and the connecting line on the other side of the liquid cooling bottom plate assembly 2;

and S7, cutting and removing the drainage block after welding.

Further, the depth of the stirring pin of the friction stir welding head 8 penetrating into the liquid-cooled bottom plate assembly 2 in the step S4 is more than half of the thickness of the liquid-cooled bottom plate assembly 2, and the shaft shoulder of the friction stir welding head 8 is pressed down to 0.2mm-0.4mm below the upper surface of the liquid-cooled bottom plate assembly 2.

Further, the rotating speed of the friction stir welding head is 1000-.

Further, the plugging component is provided with a protruding portion 9 which is connected into a whole, the protruding portion 9 is matched with the shape of an opening 21 of a cooling cavity of the liquid cooling bottom plate component 2, and the protruding portion 9 is inserted into the opening 21, so that the relative position between the plugging component and the liquid cooling bottom plate component 2 is guaranteed.

One embodiment of the invention:

the plugging assembly comprises a front plugging cross beam 1 and a rear plugging frame 3, a hollow cooling cavity in the liquid cooling bottom plate assembly 2 is used for flowing cooling liquid, openings 21 on two opposite sides of the liquid cooling bottom plate assembly 2 are used for facilitating hollow processing of the inside, an integrally-formed bulge part 9 is arranged on the right side of the front plugging cross beam 1 and used for being inserted into the opening 21 on the left side of the liquid cooling bottom plate assembly 2 to adapt in shape, align top walls and align bottom walls, and an integrally-formed bulge part 9 is arranged on the left side of the rear plugging frame 3 and used for being inserted into the opening 21 on the right side of the liquid cooling bottom plate assembly 2 to adapt in shape, align top walls and align bottom walls;

the front plugging beam 1, the rear plugging frame 3, the liquid cooling bottom plate assembly 2 and the parts to be welded of the drainage block materials have the same thickness;

placing the front plugging beam 1, the liquid cooling bottom plate assembly 2 and the rear plugging frame 3 in a fixture, inserting the bulge part 9 of the front plugging beam 1 into and plugging the left end opening 21 of the liquid cooling bottom plate assembly 2, inserting the bulge part of the rear plugging frame 3 into and plugging the right end opening 21 of the liquid cooling bottom plate assembly 2, and then clamping by using the fixture to realize the relative fixation of the front plugging beam 1, the liquid cooling bottom plate assembly 2 and the rear plugging frame 3;

the drainage block 4 and the drainage block 7 are respectively arranged at two ends of the connecting wire of the front plugging beam 1 and the liquid cooling bottom plate component 2; the drainage block 5 and the drainage block 6 are respectively arranged at two ends of a connecting wire of the rear plugging frame 3 and the liquid cooling bottom plate assembly 2, and then the drainage block is clamped by a clamp, so that the front plugging beam 1, the liquid cooling bottom plate assembly 2, the rear plugging frame 3 and the four groups of drainage blocks are relatively fixed; at the moment, the front plugging beam 1, the liquid cooling bottom plate assembly 2, the rear plugging frame 3 and the top wall and the bottom wall of the two groups of drainage blocks are mutually parallel and level;

after clamping, the front plugging beam 1, the liquid cooling bottom plate assembly 2, the drainage block 4 and the drainage block 7 are welded and connected into a whole in a spot welding mode, and the rear plugging frame 3, the liquid cooling bottom plate assembly 2, the drainage block 5 and the drainage block 6 are welded and connected into a whole.

For example: the thicknesses of the front plugging beam 1, the liquid cooling bottom plate assembly 2, the rear plugging frame 3 and the drainage block are 11 mm;

placing a front plugging beam 1, a liquid cooling bottom plate assembly 2, a rear plugging frame 3 and four groups of drainage blocks which are connected into a whole on a milling machine and clamping the drainage blocks through a clamp, installing a friction stir welding head 8 on a cutter handle of the milling machine, rotating the friction stir welding head 8 at the speed of 1200r/min and moving the friction stir welding head to the position above the drainage block 4, then descending the friction stir welding head 8 to enable a stirring needle of the friction stir welding head 8 to penetrate into the position 6mm below the top wall of the drainage block 4, pressing a shaft shoulder of the friction stir welding head 8 to the position 0.4mm below the top wall of the drainage block 4, and then linearly moving the friction stir welding head 8 to the drainage block 7 at the position of 600mm/min on the horizontal plane along the connecting line track of the front plugging beam 1 and the liquid cooling bottom plate assembly 2, so as to realize full welding of the connecting line on one side of the front plugging beam 1 and the liquid cooling bottom plate assembly 2;

then the liquid cooling bottom plate component 2, the rear plugging frame 3, the drainage block 5 and the drainage block 6 are fully welded into a whole in the same way;

then, the front plugging beam 1, the liquid cooling bottom plate assembly 2, the rear plugging frame 3, the drainage block 4, the drainage block 5, the drainage block 6 and the drainage block 7 are vertically turned over by 180 degrees and clamped tightly, so that the top wall and the bottom wall can be interchanged;

the full welding of the connecting wire of the front plugging beam 1 and the liquid cooling bottom plate assembly 2 on the other side and the full welding of the connecting wire of the rear plugging frame 3 and the liquid cooling bottom plate assembly 2 on the other side are realized in the same way, and in the process, the stirring pin of the friction stir welding head 8 extends to be more than 5mm below the top wall of the drainage block 4;

the sum of the depths of the stirring pins of the stirring friction welding head 8 which are inserted from the upper side wall and the lower side wall of the drainage block twice is larger than the thickness of the drainage block;

thereby realizing the fixedly connecting of the front plugging beam 1 and the liquid cooling bottom plate component 2 into a whole and sealing and closing the left opening of the cooling cavity of the liquid cooling bottom plate component 2; fixedly connecting the rear plugging frame 3 and the liquid cooling bottom plate assembly 2 into a whole and sealing and closing the right opening of the cooling cavity of the liquid cooling bottom plate assembly 2; the openings at the two sides of the cooling cavity of the liquid cooling bottom plate component 2 are sealed.

Through the drainage piece, outwards draw the welding bead of friction stir welding head 8, flow intact welding bead between shutoff crossbeam 1 and liquid cooling bottom plate subassembly 2 in the front, flow intact welding bead between shutoff frame 3 and liquid cooling bottom plate subassembly 2 in the back, on the drainage piece was stayed to the defect of pricking formation friction stir welding head 8, cut off the drainage piece at last and avoid producing the influence pleasing to the eye.

The stirring pin of the friction stir welding head 8 can also be inserted downwards from the connecting line between the front plugging beam 1 and the liquid cooling bottom plate assembly 2 (the rear plugging frame 3 and the liquid cooling bottom plate assembly 2), and then the friction stir welding head 8 moves linearly along the connecting line to the direction of the drainage block.

The electrical equipment is connected with an external power supply through an external control switch.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.