Lithium battery welding jig assembly and lithium battery welding method

Abstract

The invention relates to the technical field of lithium battery welding, and provides a lithium battery welding jig assembly and a lithium battery welding method.The lithium battery welding jig assembly comprises a jig, a first positioning support and a second positioning support; the jig comprises a supporting box and a cover plate, the supporting box comprises a bottom plate, a first vertical plate and a second vertical plate, multiple rows and multiple columns of welding operation through holes are formed in the bottom plate, and a first nickel sheet supporting table is arranged on the inner side surface of the bottom plate between the adjacent welding operation through holes in each column; a second nickel sheet supporting table is arranged on the inner side surface of the bottom plate between the adjacent welding operation through holes in each row, the first nickel sheet supporting table is connected with a first barrier strip and a second barrier strip, and the second nickel sheet supporting table is connected with a third barrier strip and a fourth barrier strip; the first positioning support is positioned on the surface of the inner side of the bottom plate, a positioning through hole is formed in the first positioning support, the first positioning support is provided with a blocking piece, and the lithium battery welding jig assembly achieves accurate positioning of the nickel piece and the battery.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery welding, and more specifically, to a lithium battery welding jig assembly and a lithium battery welding method. Background Art

[0002] At present, lithium batteries, as a high-performance, high-energy-density battery, require the use of highly conductive and plastic metal materials to connect electrodes. Nickel sheets have excellent conductivity and plasticity. Connecting electrodes can increase the conduction area of ​​the internal current of the battery, thereby maximizing the electrical performance of the battery. At the same time, nickel sheets connected to lithium batteries can also improve the continuity and scalability of the battery. Therefore, during the production process of lithium batteries, nickel sheets need to be welded, but the nickel sheets and the battery welding surface cannot be completely tightly matched, which will cause defects such as cold welding or explosions. When the nickel sheet is not positioned accurately, there are problems such as welding deviation. Existing fixtures still have problems with inaccurate positioning and offset during welding. Summary of the invention

[0003] In view of this, the present application provides a lithium battery welding jig assembly to solve the technical problem of welding deviation caused by inaccurate positioning of the lithium battery welding jig assembly in the prior art.

[0004] The present application provides a lithium battery welding jig assembly, characterized in that the lithium battery welding jig assembly comprises a jig, a first positioning bracket and a second positioning bracket; The jig includes a support box and a cover plate, the support box includes a bottom plate, a first vertical plate and a second vertical plate connected to both sides of the bottom plate in a width direction, the cover plate is detachably connected to the first vertical plate and the second vertical plate to enclose a battery accommodating cavity with the support box, a plurality of rows and columns of welding operation through holes are formed on the bottom plate, a plurality of welding operation through holes on each column are sequentially arranged at intervals along a first straight line direction, a plurality of welding operation through holes on each row are sequentially arranged at intervals along a second straight line direction, the first straight line direction is perpendicular to the second straight line direction, and a plurality of welding operation through holes in each column are arranged on the inner side surface of the bottom plate between adjacent welding operation through holes A first nickel sheet support platform, a second nickel sheet support platform is arranged on the inner side surface of the bottom plate between adjacent welding operation through holes in a plurality of welding operations on each row, the first nickel sheet support platform is respectively connected with a first stopper and a second stopper extending away from the bottom plate on both sides of the second straight line direction, and a corresponding section of the nickel sheet supported on the first nickel sheet support platform can be limited between the first stopper and the second stopper, the second nickel sheet support platform is respectively connected with a third stopper and a fourth stopper extending away from the bottom plate on both sides of the first straight line direction, and a corresponding section of the nickel sheet supported on the second nickel sheet support platform can be limited between the third stopper and the fourth stopper; The first positioning bracket is positioned on the inner surface of the base plate, and has positioning through holes corresponding to the number and positions of the welding operation through holes, and the diameter of the positioning through holes is larger than the diameter of the welding operation through holes. A blocking plate is provided on the side of the first positioning bracket facing the base plate corresponding to the position of each positioning through hole, and the blocking plate supports the area on the inner surface of the base plate where the first nickel sheet support platform and the second nickel sheet support platform are not provided, and the blocking plate extends a protrusion along the radial direction of the corresponding positioning through hole, and the projection of the protrusion along the axial direction of the corresponding positioning through hole is located in the corresponding positioning through hole, and the positioning through hole is used to accommodate the end of the battery to be welded, and the blocking plate is used to block and support the end face of the battery to be welded accommodated in the corresponding positioning through hole.

[0005] Further, the protruding height of the first baffle relative to the bottom plate is higher than the protruding height of the second baffle relative to the bottom plate, the first nickel sheet support platforms between adjacent welding operation through holes in a plurality of welding operations on the same column are aligned along a first straight line direction, the first baffles of the first nickel sheet support platforms between adjacent welding operation through holes in a plurality of welding operations on the same column are aligned along a first straight line direction, the second baffles of the first nickel sheet support platforms between adjacent welding operation through holes in a plurality of welding operations on the same column are aligned along a first straight line direction, and the protruding height of the third baffle relative to the bottom plate is higher than the protruding height of the fourth baffle relative to the bottom plate. At the protruding height of the base plate, the second nickel sheet support platforms between adjacent welding operation through holes in multiple welding operations on the same row are aligned along the second straight line direction, the third baffles of the second nickel sheet support platforms between adjacent welding operation through holes in multiple welding operations on the same row are aligned along the second straight line direction, and the fourth baffles of the second nickel sheet support platforms between adjacent welding operation through holes in multiple welding operations on the same row are aligned along the second straight line direction, and the extending height of the inner surface of the baffle plate facing away from the base plate is higher than the protruding height of the first baffle relative to the base plate and the protruding height of the third baffle relative to the base plate.

[0006] Furthermore, the first nickel sheet support platform between adjacent welding operation through holes in the multiple welding operations on each column forms an arc surface aligned along the axial direction of the welding operation through holes with the walls of the adjacent welding operation through holes on both sides along the first straight line direction, and the second nickel sheet support platform between adjacent welding operation through holes in the multiple welding operations on each row forms an arc surface aligned along the axial direction of the welding operation through holes with the walls of the adjacent welding operation through holes on both sides along the second straight line direction.

[0007] Furthermore, a first magnet is embedded in the first nickel sheet support platform, and an end face of the first magnet is flush with a surface of the first nickel sheet support platform located between the first baffle bar and the second baffle bar; a second magnet is embedded in the second nickel sheet support platform, and an end face of the second magnet is flush with a surface of the second nickel sheet support platform located between the third baffle bar and the fourth baffle bar.

[0008] Furthermore, the first positioning bracket is provided with four retaining plates arranged at 90° intervals around the axial direction of the corresponding positioning through holes at positions corresponding to each positioning through hole on one side facing the base plate, and the four retaining plates are respectively the first retaining plate, the second retaining plate, the third retaining plate and the fourth retaining plate in the clockwise direction, and the first retaining plate, the second retaining plate, the third retaining plate and the fourth retaining plate of each of the four positioning through holes arranged adjacent to each other along the rectangular array form a rectangular array, and the first retaining plate, the second retaining plate, the third retaining plate and the fourth retaining plate forming the rectangular array are used to extend into the limiting holes on the nickel sheet to be welded, and the limiting holes on the nickel sheet to be welded are located between the rectangles surrounded by the axes of the four batteries arranged adjacent to each other along the rectangular array, and the retaining plates include a retaining plate along The first edge extending in the first straight direction, the second edge extending in the second straight direction, and the arc edge connected between the first edge and the second edge, the first edge and the second edge of the first stop plate, the second stop plate, the third stop plate and the fourth stop plate are respectively located on the same rectangle, the arc edges of the first stop plate, the second stop plate, the third stop plate and the fourth stop plate respectively form four arc chamfers of the same rectangle, the first positioning bracket is a rectangular plate, the four edges of the rectangular plate are provided with first arc avoidance notches corresponding to the positions between adjacent stop plates, the four corners of the rectangular plate form second arc avoidance notches, and the rectangular plate forms a circular avoidance through-hole between the first stop plate, the second stop plate, the third stop plate and the fourth stop plate forming a rectangular array.

[0009] Furthermore, the first vertical plate and the second vertical plate are provided with a magnetic attraction part and a protruding rod portion facing the cover plate, and the cover plate has a magnetically attracted part corresponding to the magnetic attraction part and a limiting hole corresponding to the protruding rod portion. When the cover plate is connected to the support box, the magnetically attracted part on the cover plate is magnetically matched with the magnetic attraction part, and the protruding rod portion is located in the limiting hole. The first vertical plate is also connected to a handle relative to the outside of the battery accommodating cavity.

[0010] Furthermore, a groove is formed on the inner surface of the bottom plate, the first positioning bracket is limited by the side wall of the groove and positioned on the inner surface of the bottom plate, and the first nickel sheet support platform and the second nickel sheet support platform are arranged on the groove.

[0011] Furthermore, the lithium battery welding jig assembly also includes an L-shaped reinforcing metal plate, which is connected to the end surface of at least one of the first vertical plate and the second vertical plate and is located between the bottom plate and the cover plate.

[0012] Furthermore, the cover plate is formed with a welding operation through hole, a first nickel sheet support platform and a second nickel sheet support platform, the second positioning bracket is positioned on the inner surface of the cover plate and is provided with a positioning through hole and a blocking plate, which are consistent with the position and size of the first positioning bracket. The first positioning bracket and the second positioning bracket are both plastic parts.

[0013] In addition, the present invention also provides a lithium battery welding method, wherein the lithium battery welding method is implemented using the above-mentioned lithium battery welding fixture assembly, and the lithium battery welding method comprises the steps of: a. Place the first nickel sheet to be welded on the bottom plate of the jig, so that the corresponding sections of the first nickel sheet to be welded are supported on the corresponding first nickel sheet support platform and the second nickel sheet support platform and are correspondingly limited between the first stop bar and the second stop bar or between the third stop bar and the fourth stop bar; b. Place a first positioning bracket on the bottom plate of the fixture, so that the first positioning bracket is positioned on the inner surface of the bottom plate, and the first retaining piece, the second retaining piece, the third retaining piece and the fourth retaining piece forming a rectangular array on the first positioning bracket extend into the limiting hole on the first nickel sheet to be welded so that the first nickel sheet to be welded forms a limiting position with the first positioning bracket; c. Select a desired positioning through hole in the positioning through hole of the first positioning bracket and place the battery to be welded therein, so that the first end of the battery to be welded enters the positioning through hole and contacts the first nickel sheet to be welded and is abutted by the corresponding first retaining sheet, second retaining sheet, third retaining sheet and fourth retaining sheet; d. Place the second nickel sheet to be welded on the cover plate of the jig, so that the corresponding sections of the second nickel sheet to be welded are supported on the corresponding first nickel sheet support platform and second nickel sheet support platform on the cover plate and are correspondingly limited between the first stop bar and the second stop bar or between the third stop bar and the fourth stop bar; e. Place a second positioning bracket on the cover plate of the jig, so that the second positioning bracket is positioned on the inner surface of the cover plate, and the first retaining piece, the second retaining piece, the third retaining piece and the fourth retaining piece forming a rectangular array on the second positioning bracket extend into the limiting hole on the second nickel sheet to be welded so that the second nickel sheet to be welded forms a limiting position with the second positioning bracket; f. Cover the cover plate on the support box, so that the second end of the battery to be welded enters the positioning through hole of the second positioning bracket and contacts the second nickel sheet to be welded and is abutted by the corresponding first retaining sheet, second retaining sheet, third retaining sheet and fourth retaining sheet, and the magnetically attracted portion on the cover plate is magnetically matched with the magnetic member, and the protruding rod is inserted into the limiting hole; g. Place the jig on the workstation of the automatic lithium battery welding machine so that the bottom plate of the jig is supported on the workstation, the cover plate of the jig is located directly above the bottom plate, and the second end of each battery to be welded is welded to the second nickel sheet to be welded through the welding operation through hole on the cover plate, and then support the cover plate of the jig on the workstation so that the bottom plate of the jig is located directly above the bottom plate, and weld the first end of each battery to be welded to the first nickel sheet to be welded through the welding operation through hole on the bottom plate to form a welded lithium battery module; or, support the cover plate of the jig on the workstation so that the bottom plate of the jig is located directly above the bottom plate, and weld the first end of each battery to be welded to the first nickel sheet to be welded through the welding operation through hole on the bottom plate, and then place the jig on the workstation of the automatic lithium battery welding machine so that the bottom plate of the jig is supported on the workstation so that the cover plate of the jig is located directly above the bottom plate, and weld the second end of each battery to be welded to the second nickel sheet to be welded through the welding operation through hole on the cover plate to form a welded lithium battery module; h. Separate the cover plate from the support box, shake the welded lithium battery module, and remove it from the bottom plate along the combined direction formed by the first direction, the second direction and the third direction, wherein the first direction is the direction from the first baffle on the bottom plate to the second baffle, the second direction is the direction from the third baffle on the bottom plate to the fourth baffle, and the third direction is the direction facing away from the inner surface of the bottom plate.

[0014] Compared with the prior art, in the lithium battery welding jig assembly provided by the present invention, since a first nickel sheet support platform is provided on the inner surface of the bottom plate between adjacent welding operation through holes in multiple welding operations on each column, and a second nickel sheet support platform is provided on the inner surface of the bottom plate between adjacent welding operation through holes in multiple welding operations on each row, the first nickel sheet support platform and the second nickel sheet support platform provide good support for the nickel sheet to be welded, and the corresponding section of the nickel sheet supported on the first nickel sheet support platform is limited by the first and second stop bars, and the corresponding section of the nickel sheet supported on the second nickel sheet support platform is limited by the third and fourth stop bars, so as to The nickel sheet is precisely positioned, and the battery to be welded is precisely positioned by the first positioning bracket, thereby achieving precise positioning of the nickel sheet and the battery, facilitating the accuracy of subsequent welding operations between the nickel sheet and the battery, and will not cause the nickel sheet to be welded and the battery to be misaligned, or at least can alleviate the phenomenon of misalignment between the nickel sheet to be welded and the battery. In addition, the retaining sheet is supported on the area on the inner surface of the base plate where the first nickel sheet support platform and the second nickel sheet support platform are not provided, and the space between the first nickel sheet support platform and the second nickel sheet support platform is fully utilized to accommodate the retaining sheet, thereby avoiding interference between the retaining sheet and the first nickel sheet support platform and the second nickel sheet support platform, thereby avoiding interference between the retaining sheet and the nickel sheet supported by the base plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a partial structural schematic diagram of a lithium battery welding jig assembly in an embodiment of the present application during the process of setting a nickel sheet and a battery to be welded; Figure 2 for Figure 1 The enlarged view of point A in the middle; Figure 3 for Figure 1 The enlarged view of point B in the middle; Figure 4 A three-dimensional schematic diagram of a first positioning bracket in a lithium battery welding jig assembly according to an embodiment of the present application; Figure 5 This is a schematic diagram of the partial structure of a lithium battery welding jig assembly according to an embodiment of the present application after the welding of the nickel sheet and the battery to be welded is completed and the cover plate is removed; Figure 6 This is a three-dimensional schematic diagram of a lithium battery welding jig assembly according to an embodiment of the present application after the nickel sheet and the battery to be welded are completed; Figure 7 This is a cross-sectional view of a lithium battery welding jig assembly according to an embodiment of the present application after the nickel sheet and the battery are welded. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. One or more embodiments of the present application are exemplarily given in the drawings to make the understanding of the technical solution disclosed in the present application more accurate and thorough. However, it should be understood that the present application can be implemented in a variety of different forms and is not limited to the embodiments described below.

[0018] The same or similar numbers in the drawings of the present application correspond to the same or similar parts; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0019] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B.

[0020] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0021] See also Figures 1 to 3 , Figure 6 and Figure 7 According to one aspect of the present invention, a lithium battery welding jig assembly is provided, wherein the lithium battery welding jig assembly includes a jig, a first positioning bracket 300 and a second positioning bracket 400; The fixture includes a support box 100 and a cover plate 200. The support box 100 includes a bottom plate 101, a first vertical plate 102 and a second vertical plate 103 connected on both sides of the bottom plate 101 in the width direction. The cover plate 200 is detachably connected to the first vertical plate 102 and the second vertical plate 103 to enclose a battery accommodating cavity 23 with the support box 100. A plurality of rows and columns of welding operation through holes 1 are formed on the bottom plate 101. The plurality of welding operation through holes 1 on each column are sequentially arranged along a first straight line direction L1 (the first straight line direction L1 can specifically be the width direction of the bottom plate 101). The plurality of welding operation through holes 1 on each row are sequentially arranged along a second straight line direction L2 (the second straight line direction L2 can specifically be the length direction of the bottom plate 101). The first straight line direction L1 is perpendicular to the second straight line direction L2. The adjacent welding holes in the plurality of welding operations on each column are arranged in a spaced relationship. A first nickel sheet support platform 500 is provided on the inner surface of the bottom plate 101 between the operation through holes 1, and a second nickel sheet support platform 600 is provided on the inner surface of the bottom plate 101 between the adjacent welding operation through holes 1 in each row of multiple welding operations. The first nickel sheet support platform 500 is respectively connected with a first stopper 501 and a second stopper 502 extending away from the bottom plate 101 on both sides of the second straight line direction L2, and the corresponding section of the nickel sheet supported on the first nickel sheet support platform 500 can be limited between the first stopper 501 and the second stopper 502. The second nickel sheet support platform 600 is respectively connected with a third stopper 601 and a fourth stopper 602 extending away from the bottom plate 101 on both sides of the first straight line direction L1, and the corresponding section of the nickel sheet supported on the second nickel sheet support platform 600 can be limited between the third stopper 601 and the fourth stopper 602; The first positioning bracket 300 is positioned on the inner surface of the base plate 101. The first positioning bracket 300 has positioning holes 2 corresponding to the number and position of the welding operation through holes 1. The diameter of the positioning through holes 2 is larger than the diameter of the welding operation through holes 1. The first positioning bracket 300 is provided with a blocking piece 700 on the side facing the base plate 101 corresponding to the position of each positioning through hole 2. The blocking piece 700 supports the area on the inner surface of the base plate 101 where the first nickel sheet support platform 500 and the second nickel sheet support platform 600 are not provided. The blocking piece 700 extends a protrusion 701 along the radial direction of the corresponding positioning through hole 2. The projection of the protrusion 701 along the axial direction of the corresponding positioning through hole 2 is located in the corresponding positioning through hole 2. The positioning through hole 2 is used to accommodate the end of the battery 3 to be welded, and the blocking piece 700 is used to block and support the end face of the battery 3 to be welded accommodated in the corresponding positioning through hole 2.

[0022] In the lithium battery welding jig assembly provided by the present invention, since a first nickel sheet support platform 500 is provided on the inner surface of the bottom plate 101 between adjacent welding operation through holes 1 in multiple welding operations on each column, and a second nickel sheet support platform 600 is provided on the inner surface of the bottom plate 101 between adjacent welding operation through holes 1 in multiple welding operations on each row, the first nickel sheet support platform 500 and the second nickel sheet support platform 600 provide good support for the nickel sheet to be welded on the one hand, and on the other hand, the corresponding section of the nickel sheet supported on the first nickel sheet support platform 500 is limited by the first stop bar 501 and the second stop bar 502, and the corresponding section of the nickel sheet (for example, the first nickel sheet to be welded 17) supported on the second nickel sheet support platform 600 is limited by the third stop bar 601 and the fourth stop bar 602, so as to The nickel sheet to be welded is precisely positioned, and the battery 3 to be welded is precisely positioned by the first positioning bracket 300, thereby realizing precise positioning of the nickel sheet and the battery, facilitating the accuracy of subsequent welding operations between the nickel sheet and the battery, and will not cause the phenomenon of the nickel sheet to be welded and the battery being misaligned, or at least can alleviate the phenomenon of the nickel sheet to be welded and the battery being misaligned. In addition, the blocking sheet 700 is supported on the area on the inner surface of the base plate 101 where the first nickel sheet support platform 500 and the second nickel sheet support platform 600 are not provided, and the space between the first nickel sheet support platform 500 and the second nickel sheet support platform 600 is fully utilized to accommodate the blocking sheet 700, thereby avoiding interference between the blocking sheet 700 and the first nickel sheet support platform 500 and the second nickel sheet support platform 600, and further avoiding interference between the blocking sheet 700 and the nickel sheet supported by the base plate 101.

[0023] See also Figure 2 and Figure 3According to a preferred embodiment of the present application, the protruding height of the first stopper 501 relative to the bottom plate 101 is higher than the protruding height of the second stopper 502 relative to the bottom plate 101, so as to avoid the phenomenon that the nickel sheet is difficult to be taken out later due to the excessive bite force of the corresponding section of the nickel sheet being limited when the first stopper 501 and the second stopper 502 are at the same height when the lithium battery module after welding is taken out, and it is convenient to quickly take out the nickel sheet when shaking the nickel sheet. The first nickel sheet support platform 500 between the adjacent welding operation through holes 1 in the multiple welding operations on the same column is aligned along the first straight line direction L1, and the multiple welding operations on the same column are The first stopper 501 of the first nickel sheet support platform 500 between the adjacent welding operation through holes 1 in the welding operation is aligned along the first straight line direction L1, and the second stopper 502 of the first nickel sheet support platform 500 between the adjacent welding operation through holes 1 in the multiple welding operations on the same column is aligned along the first straight line direction L1, and the protruding height of the third stopper 601 relative to the bottom plate 101 is higher than the protruding height of the fourth stopper 602 relative to the bottom plate 101, so as to avoid the corresponding section of the nickel sheet being bitten when the third stopper 601 and the fourth stopper 602 are at the same height when the lithium battery module after welding is taken out later. The combined force is too strong and the nickel sheet is difficult to remove. In order to facilitate the quick removal of the nickel sheet by shaking the nickel sheet, the second nickel sheet support platform 600 between the adjacent welding operation through holes 1 in the multiple welding operations on the same row is aligned along the second straight line direction L2, the third blocking bar 601 of the second nickel sheet support platform 600 between the adjacent welding operation through holes 1 in the multiple welding operations on the same row is aligned along the second straight line direction L2, the fourth blocking bar 602 of the second nickel sheet support platform 600 between the adjacent welding operation through holes 1 in the multiple welding operations on the same row is aligned along the second straight line direction L2, and the blocking sheet 700 is The extension height of the inner surface facing away from the bottom plate 101 is higher than the protruding height of the first baffle 501 relative to the bottom plate 101 and the protruding height of the third baffle 601 relative to the bottom plate 101, so as to ensure that the battery 3 to be welded blocked by the blocking sheet 700 will not produce unnecessary interference contact with the first baffle 501, the second baffle 502, the third baffle 601 and the fourth baffle 602, thereby ensuring the precise positioning of the battery 3 to be welded, because the end face of the battery 3 to be welded will be in an outward convex shape toward its center, which can ensure that the middle position of the end face of the battery 3 to be welded is in good contact with the nickel sheet to achieve subsequent welding operations.

[0024] See also Figure 2According to one embodiment of the present application, the first nickel sheet support platform 500 between adjacent welding operation through holes 1 in multiple welding operations on each column forms an arc surface 22 aligned along the axial direction of the welding operation through hole 1 with the wall surface of the adjacent welding operation through hole 1 on both sides along the first straight direction L1, and the second nickel sheet support platform 600 between adjacent welding operation through holes 1 in multiple welding operations on each row forms an arc surface 22 aligned along the axial direction of the welding operation through hole 1 with the wall surface of the adjacent welding operation through hole 1 on both sides along the second straight direction L2. In this way, it is ensured that the first nickel sheet support platform 500 and the second nickel sheet support platform 600 can have the maximum size as much as possible without causing any interference to the welding operation through hole 1, thereby ensuring that the subsequent welding operation through the welding operation through hole 1 is carried out smoothly.

[0025] See also Figure 2 According to an embodiment of the present application, a first magnet 4 is embedded in the first nickel sheet support platform 500, and the end face of the first magnet 4 is flush with the surface of the first nickel sheet support platform 500 located between the first baffle 501 and the second baffle 502. A second magnet 5 is embedded in the second nickel sheet support platform 600, and the end face of the second magnet 5 is flush with the surface of the second nickel sheet support platform 600 located between the third baffle 601 and the fourth baffle 602. The first magnet 4 and the second magnet 5 can respectively adsorb the corresponding sections of the nickel sheet supported on the first nickel sheet support platform 500 and the second nickel sheet support platform 600, further improving the stability and reliability of the first nickel sheet support platform 500 and the second nickel sheet support platform 600 in supporting and limiting the nickel sheet.

[0026] See also Figure 3 and Figure 4According to one embodiment of the present application, four retaining pieces 700 are arranged at 90° intervals around the axial direction of the corresponding positioning through hole 2 on one side of the first positioning bracket 300 facing the bottom plate 101. The four retaining pieces 700 are arranged in a clockwise direction as follows: a first retaining piece 6, a second retaining piece 7, a third retaining piece 8 and a fourth retaining piece 9. The first retaining piece 6, the second retaining piece 7, the third retaining piece 8 and the fourth retaining piece 9 of the four positioning through holes 2 adjacently arranged along the rectangular array (preferably a square array) form a rectangular array (preferably a square array), forming a rectangular The first retaining piece 6, the second retaining piece 7, the third retaining piece 8 and the fourth retaining piece 9 of the array are used to extend into the limiting hole 20 (the limiting hole 20 can be a rectangular hole, preferably a square hole) on the nickel sheet to be welded (for example, the first nickel sheet to be welded 17), and the limiting hole 20 on the nickel sheet to be welded is located between the rectangles surrounded by the axes of the four batteries arranged adjacent to each other along the rectangular array. The retaining piece 700 includes a first edge 702 extending along the first straight line direction L1 and a second edge 703 extending along the second straight line direction L2 and an arc edge 704 connected between the first edge 702 and the second edge 703. The first side 702 and the second side 703 of each of the nickel sheet 6, the second nickel sheet 7, the third nickel sheet 8 and the fourth nickel sheet 9 are located on the same rectangle (preferably a square), and the same rectangle is just located in the four nickel sheet support platforms arranged adjacent to each other along the rectangular array (for example, the first nickel sheet support platform 500, the second nickel sheet support platform 600, the first nickel sheet support platform 500 and the second nickel sheet support platform 600 arranged clockwise), and can be parallel to the corresponding nickel sheet support platforms, and the arc sides 704 of the first nickel sheet 6, the second nickel sheet 7, the third nickel sheet 8 and the fourth nickel sheet 9 form the same rectangle. The first positioning bracket 300 has four arc chamfers, and the four sides of the rectangular plate are provided with first arc-shaped avoidance gaps 10 corresponding to the positions between the adjacent retaining pieces 700. The four corners of the rectangular plate form second arc-shaped avoidance gaps 11. The rectangular plate forms circular avoidance holes 12 between the first retaining piece 6, the second retaining piece 7, the third retaining piece 8 and the fourth retaining piece 9 forming a rectangular array. The first arc-shaped avoidance gap 10, the second arc-shaped avoidance gap 11 and the circular avoidance hole 12 can avoid the structures such as the mounting columns in the fixture, so that the first positioning bracket 300 will not interfere with these structures.

[0027] According to one embodiment of the present application, the first vertical plate 102 and the second vertical plate 103 are provided with a magnetic attraction member 13 and a protruding rod portion 14 facing the cover plate 200, and the cover plate 200 has a magnetically attracted portion corresponding to the magnetic attraction member 13 and a limiting hole corresponding to the protruding rod portion 14. When the cover plate 200 is connected to the support box 100, the magnetically attracted portion on the cover plate 200 is magnetically matched with the magnetic attraction member 13, and the protruding rod portion 14 is located in the limiting hole. The first vertical plate 102 is also connected to the outside of the battery accommodating cavity 23 with a handle 15. The magnetic attraction member 13 and the magnetically attracted portion can be magnets, which facilitates the cover plate 200 to be quickly connected to the support box 100.

[0028] In addition, a groove 16 is formed on the inner surface of the base plate 101, and the first positioning bracket 300 is stopped and limited by the side wall 21 of the groove 16 and positioned on the inner surface of the base plate 101, so that the first positioning bracket 300 can be accurately positioned relative to the inner surface of the base plate 101. Since the nickel sheet is also accurately positioned relative to the inner surface of the base plate 101, the nickel sheet and the first positioning bracket 300 are accurately positioned, and finally the nickel sheet and the battery limited to the first positioning bracket 300 are accurately positioned. The first nickel sheet support platform 500 and the second nickel sheet support platform 600 are arranged on the groove.

[0029] In addition, the lithium battery welding jig assembly also includes an L-shaped reinforced metal plate 21, which is connected to the end surface of at least one of the first positioning bracket 300 and the second positioning bracket 400 and is located between the base plate 101 and the cover plate 200. The L-shaped reinforced metal plate 21 can be connected to the first vertical plate 102 and the second vertical plate 103 by structures such as bolts.

[0030] According to a preferred embodiment of the present application, a welding operation through hole 1, a first nickel sheet support platform 500 and a second nickel sheet support platform 600 are formed on the cover plate 200, and the second positioning bracket 400 is positioned on the inner surface of the cover plate 200 and is provided with a positioning through hole 2 and a blocking plate 700 that are consistent with the position and size on the first positioning bracket 300. The first positioning bracket 300 and the second positioning bracket 400 are both plastic parts, which will not cause unnecessary collision and wear on the battery and the nickel sheet. In this embodiment, the corresponding structure on the cover plate 200 has the same advantages and functions as the corresponding structure on the base plate 101, and the second positioning bracket 400 has the same advantages and functions as the first positioning bracket 300, which will not be repeated here.

[0031] For reference Figures 1 to 7 According to another aspect of the present invention, a lithium battery welding method is also provided, wherein the lithium battery welding method is implemented using the above-mentioned lithium battery welding fixture assembly, and the lithium battery welding method comprises the steps of: a. Place the first nickel sheet 17 to be welded on the bottom plate 101 of the fixture, so that the corresponding sections of the first nickel sheet 17 to be welded are supported on the corresponding first nickel sheet support platform 500 and second nickel sheet support platform 600 and are correspondingly limited between the first stop bar 501 and the second stop bar 502 or between the third stop bar 601 and the fourth stop bar 602; b. Place the first positioning bracket 300 on the bottom plate 101 of the fixture, so that the first positioning bracket 300 is positioned on the inner surface of the bottom plate 101, and the first retaining piece 6, the second retaining piece 7, the third retaining piece 8 and the fourth retaining piece 9 forming a rectangular array on the first positioning bracket 300 extend into the limiting hole on the first nickel sheet to be welded 17 so that the first nickel sheet to be welded 17 and the first positioning bracket 300 form a limiting position; c. Select a desired positioning through hole 2 from the positioning through hole 2 of the first positioning bracket 300 and place the battery 3 to be welded therein, so that the first end of the battery 3 to be welded enters the positioning through hole 2 and contacts the first nickel sheet 17 to be welded and is abutted by the corresponding first retaining sheet 6, second retaining sheet 7, third retaining sheet 8 and fourth retaining sheet 9; d. Place the second nickel sheet 18 to be welded on the cover plate 200 of the jig, so that the corresponding sections of the second nickel sheet 18 to be welded are supported on the corresponding first nickel sheet support platform 500 and second nickel sheet support platform 600 on the cover plate 200 and are correspondingly limited between the first stop bar 501 and the second stop bar 502 or between the third stop bar 601 and the fourth stop bar 602; e. Place the second positioning bracket 400 on the cover plate 200 of the fixture, so that the second positioning bracket 400 is positioned on the inner surface of the cover plate 200, and the first retaining piece 6, the second retaining piece 7, the third retaining piece 8 and the fourth retaining piece 9 forming a rectangular array on the second positioning bracket 400 extend into the limiting hole on the second nickel sheet 18 to be welded so that the second nickel sheet 18 to be welded forms a limiting position with the second positioning bracket 400; f. Cover the cover plate 200 on the support box 100, so that the second end of the battery 3 to be welded enters the positioning through hole 2 of the second positioning bracket 400 and contacts the second nickel sheet 18 to be welded and is abutted by the corresponding first abutment sheet 6, second abutment sheet 7, third abutment sheet 8 and fourth abutment sheet 9, and the magnetically attracted portion on the cover plate 200 is magnetically matched with the magnetic attraction member 13, and the protruding rod portion 14 is inserted into the limiting hole; g. Place the jig on the workstation of the lithium battery automatic welding machine so that the bottom plate 101 of the jig is supported on the workstation, and the cover plate 200 of the jig is located directly above the bottom plate 101. The second end of each battery 3 to be welded is welded to the second nickel sheet 18 to be welded through the welding operation through hole 1 on the cover plate 200. Then, support the cover plate 200 of the jig on the workstation so that the bottom plate 101 of the jig is located directly above the bottom plate 101. The first end of each battery 3 to be welded is welded to the first nickel sheet 17 to be welded through the welding operation through hole 1 on the bottom plate 101 to form a welded lithium battery module; or, support the cover plate 200 of the jig on the workstation so that the bottom plate 101 of the jig is Located directly above the bottom plate 101, the first end of each battery 3 to be welded is welded to the first nickel sheet 17 to be welded through the welding operation through hole 1 on the bottom plate 101, and then the jig is placed on the workstation of the lithium battery automatic electric welding machine, so that the bottom plate 101 of the jig is supported on the workstation, and the cover plate 200 of the jig is located directly above the bottom plate 101, and the second end of each battery 3 to be welded is welded to the second nickel sheet 18 to be welded through the welding operation through hole 1 on the cover plate 200 to form a welded lithium battery module. When there are multiple lithium battery modules, the multiple lithium battery modules can also be connected in series in a side-standing arrangement through redundant nickel sheets (such as the third nickel sheet 19 to be welded); h. Separate the cover plate 200 from the support box 100, and shake the welded lithium battery module to make it detach from the bottom plate 101 and be taken out along the combined direction formed by the first direction, the second direction and the third direction, wherein the first direction is the direction from the first baffle 501 on the bottom plate 101 to the second baffle 502, the second direction is the direction from the third baffle 601 on the bottom plate 101 to the fourth baffle 602, and the third direction is the direction facing away from the inner surface of the bottom plate 101.

[0032] It should be noted that the above embodiments only express the preferred implementation of the present application, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the present application. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present application, such as combining different features in various embodiments, etc., which should all fall within the scope of protection of the present application.

Claims

1. A lithium battery welding fixture assembly, characterized in that: The lithium battery welding jig assembly comprises a jig, a first positioning bracket and a second positioning bracket; The jig includes a support box and a cover plate, the support box includes a bottom plate, a first vertical plate and a second vertical plate connected to both sides of the bottom plate in a width direction, the cover plate is detachably connected to the first vertical plate and the second vertical plate to enclose a battery accommodating cavity with the support box, a plurality of rows and columns of welding operation through holes are formed on the bottom plate, a plurality of welding operation through holes on each column are sequentially arranged at intervals along a first straight line direction, a plurality of welding operation through holes on each row are sequentially arranged at intervals along a second straight line direction, the first straight line direction is perpendicular to the second straight line direction, and a plurality of welding operation through holes in each column are arranged on the inner side surface of the bottom plate between adjacent welding operation through holes A first nickel sheet support platform, a second nickel sheet support platform is arranged on the inner side surface of the bottom plate between adjacent welding operation through holes in a plurality of welding operations on each row, the first nickel sheet support platform is respectively connected with a first stopper and a second stopper extending away from the bottom plate on both sides of the second straight line direction, and a corresponding section of the nickel sheet supported on the first nickel sheet support platform can be limited between the first stopper and the second stopper, the second nickel sheet support platform is respectively connected with a third stopper and a fourth stopper extending away from the bottom plate on both sides of the first straight line direction, and a corresponding section of the nickel sheet supported on the second nickel sheet support platform can be limited between the third stopper and the fourth stopper; The first positioning bracket is positioned on the inner surface of the base plate, and has positioning through holes corresponding to the number and positions of the welding operation through holes, and the diameter of the positioning through holes is larger than the diameter of the welding operation through holes. A blocking plate is provided on the side of the first positioning bracket facing the base plate corresponding to the position of each positioning through hole, and the blocking plate supports the area on the inner surface of the base plate where the first nickel sheet support platform and the second nickel sheet support platform are not provided, and the blocking plate extends a protrusion along the radial direction of the corresponding positioning through hole, and the projection of the protrusion along the axial direction of the corresponding positioning through hole is located in the corresponding positioning through hole, and the positioning through hole is used to accommodate the end of the battery to be welded, and the blocking plate is used to block and support the end face of the battery to be welded accommodated in the corresponding positioning through hole.

2. The lithium battery welding jig assembly according to claim 1, characterized in that: The protruding height of the first stopper relative to the bottom plate is higher than the protruding height of the second stopper relative to the bottom plate, the first nickel sheet support platforms between adjacent welding operation through holes in a plurality of welding operations on the same column are aligned along a first straight line direction, the first stopper of the first nickel sheet support platform between adjacent welding operation through holes in a plurality of welding operations on the same column are aligned along a first straight line direction, the second stopper of the first nickel sheet support platform between adjacent welding operation through holes in a plurality of welding operations on the same column are aligned along a first straight line direction, the protruding height of the third stopper relative to the bottom plate is higher than the protruding height of the fourth stopper relative to the The protruding height of the bottom plate, the second nickel sheet support platform between adjacent welding operation through holes in multiple welding operations on the same row are aligned along the second straight line direction, the third baffle of the second nickel sheet support platform between adjacent welding operation through holes in multiple welding operations on the same row are aligned along the second straight line direction, and the fourth baffle of the second nickel sheet support platform between adjacent welding operation through holes in multiple welding operations on the same row are aligned along the second straight line direction, and the extension height of the baffle plate facing away from the inner surface of the bottom plate is higher than the protruding height of the first baffle relative to the bottom plate and the protruding height of the third baffle relative to the bottom plate.

3. The lithium battery welding jig assembly according to claim 2, characterized in that: The first nickel sheet support platform between adjacent welding operation through holes in the multiple welding operations on each column forms an arc surface aligned along the axial direction of the welding operation through holes with the walls of the adjacent welding operation through holes on both sides along the first straight line direction, and the second nickel sheet support platform between adjacent welding operation through holes in the multiple welding operations on each row forms an arc surface aligned along the axial direction of the welding operation through holes with the walls of the adjacent welding operation through holes on both sides along the second straight line direction.

4. The lithium battery welding jig assembly according to claim 3, characterized in that: A first magnet is embedded in the first nickel sheet support platform, and an end surface of the first magnet is flush with a surface of the first nickel sheet support platform located between the first baffle bar and the second baffle bar. A second magnet is embedded in the second nickel sheet support platform, and an end surface of the second magnet is flush with a surface of the second nickel sheet support platform located between the third baffle bar and the fourth baffle bar.

5. The lithium battery welding jig assembly according to claim 4, characterized in that: The positions of the positioning through holes on one side of the first positioning bracket facing the bottom plate are provided with four blocking pieces arranged at 90° intervals around the axial direction of the corresponding positioning through holes, and the four blocking pieces are respectively the first blocking piece, the second blocking piece, the third blocking piece and the fourth blocking piece in the clockwise direction, and the first blocking piece, the second blocking piece, the third blocking piece and the fourth blocking piece of the four positioning through holes arranged adjacent to each other along the rectangular array form a rectangular array, and the first blocking piece, the second blocking piece, the third blocking piece and the fourth blocking piece forming the rectangular array are used to extend into the limiting holes on the nickel sheet to be welded, and the limiting holes on the nickel sheet to be welded are located between the rectangles surrounded by the axes of the four batteries arranged adjacent to each other along the rectangular array, and the blocking pieces include a first blocking piece along the first straight line. The first edge extending in the straight line direction and the second edge extending in the second straight line direction and the arc edge connected between the first edge and the second edge, the first edge and the second edge of the first stop plate, the second stop plate, the third stop plate and the fourth stop plate are respectively located on the same rectangle, and the arc edges of the first stop plate, the second stop plate, the third stop plate and the fourth stop plate form four arc chamfers of the same rectangle, the first positioning bracket is a rectangular plate, and the four edges of the rectangular plate are provided with first arc avoidance notches corresponding to the positions between adjacent stop plates, and the four corners of the rectangular plate form second arc avoidance notches, and the rectangular plate forms a circular avoidance through-hole between the first stop plate, the second stop plate, the third stop plate and the fourth stop plate forming a rectangular array.

6. The lithium battery welding jig assembly according to claim 5, characterized in that: The first vertical plate and the second vertical plate are provided with magnetic parts and protruding rods facing the cover plate, and the cover plate has a magnetically attracted part corresponding to the magnetic part and a limiting hole corresponding to the protruding rod. When the cover plate is connected to the support box, the magnetically attracted part on the cover plate is magnetically matched with the magnetic part, and the protruding rod is located in the limiting hole. The first vertical plate is also connected to a handle relative to the outside of the battery accommodating cavity.

7. The lithium battery welding jig assembly according to claim 6, characterized in that: A sink groove is formed on the inner surface of the bottom plate, the first positioning bracket is limited by the side wall of the sink groove and positioned on the inner surface of the bottom plate, and the first nickel sheet support platform and the second nickel sheet support platform are arranged on the sink groove.

8. The lithium battery welding jig assembly according to claim 7, characterized in that: The lithium battery welding fixture assembly also includes an L-shaped reinforcing metal plate, which is connected to the end surface of at least one of the first vertical plate and the second vertical plate and is located between the bottom plate and the cover plate.

9. The lithium battery welding jig assembly according to claim 8, characterized in that: The cover plate is formed with a welding operation through hole, a first nickel sheet support platform and a second nickel sheet support platform that are consistent with the position and size of the base plate; the second positioning bracket is positioned on the inner surface of the cover plate and is provided with a positioning through hole and a blocking plate that are consistent with the position and size of the first positioning bracket; the first positioning bracket and the second positioning bracket are both plastic parts.

10. A lithium battery welding method, characterized in that: The lithium battery welding method is implemented by using the lithium battery welding jig assembly according to claim 9, and the lithium battery welding method comprises the steps of: a. Place the first nickel sheet to be welded on the bottom plate of the jig, so that the corresponding sections of the first nickel sheet to be welded are supported on the corresponding first nickel sheet support platform and the second nickel sheet support platform and are correspondingly limited between the first stop bar and the second stop bar or between the third stop bar and the fourth stop bar; b. Place a first positioning bracket on the bottom plate of the fixture, so that the first positioning bracket is positioned on the inner surface of the bottom plate, and the first retaining piece, the second retaining piece, the third retaining piece and the fourth retaining piece forming a rectangular array on the first positioning bracket extend into the limiting hole on the first nickel sheet to be welded so that the first nickel sheet to be welded forms a limiting position with the first positioning bracket; c. Select a desired positioning through hole in the positioning through hole of the first positioning bracket and place the battery to be welded therein, so that the first end of the battery to be welded enters the positioning through hole and contacts the first nickel sheet to be welded and is abutted by the corresponding first retaining sheet, second retaining sheet, third retaining sheet and fourth retaining sheet; d. Place the second nickel sheet to be welded on the cover plate of the jig, so that the corresponding sections of the second nickel sheet to be welded are supported on the corresponding first nickel sheet support platform and second nickel sheet support platform on the cover plate and are correspondingly limited between the first stop bar and the second stop bar or between the third stop bar and the fourth stop bar; e. Place a second positioning bracket on the cover plate of the jig, so that the second positioning bracket is positioned on the inner surface of the cover plate, and the first retaining piece, the second retaining piece, the third retaining piece and the fourth retaining piece forming a rectangular array on the second positioning bracket extend into the limiting hole on the second nickel sheet to be welded so that the second nickel sheet to be welded forms a limiting position with the second positioning bracket; f. Cover the cover plate on the support box, so that the second end of the battery to be welded enters the positioning through hole of the second positioning bracket and contacts the second nickel sheet to be welded and is abutted by the corresponding first retaining sheet, second retaining sheet, third retaining sheet and fourth retaining sheet, and the magnetically attracted portion on the cover plate is magnetically matched with the magnetic member, and the protruding rod is inserted into the limiting hole; g. Place the jig on the workstation of the automatic lithium battery welding machine so that the bottom plate of the jig is supported on the workstation, the cover plate of the jig is located directly above the bottom plate, and the second end of each battery to be welded is welded to the second nickel sheet to be welded through the welding operation through hole on the cover plate, and then support the cover plate of the jig on the workstation so that the bottom plate of the jig is located directly above the bottom plate, and weld the first end of each battery to be welded to the first nickel sheet to be welded through the welding operation through hole on the bottom plate to form a welded lithium battery module; or, support the cover plate of the jig on the workstation so that the bottom plate of the jig is located directly above the bottom plate, and weld the first end of each battery to be welded to the first nickel sheet to be welded through the welding operation through hole on the bottom plate, and then place the jig on the workstation of the automatic lithium battery welding machine so that the bottom plate of the jig is supported on the workstation so that the cover plate of the jig is located directly above the bottom plate, and weld the second end of each battery to be welded to the second nickel sheet to be welded through the welding operation through hole on the cover plate to form a welded lithium battery module; h. Separate the cover plate from the support box, shake the welded lithium battery module, and remove it from the bottom plate along the combined direction formed by the first direction, the second direction and the third direction, wherein the first direction is the direction from the first baffle on the bottom plate to the second baffle, the second direction is the direction from the third baffle on the bottom plate to the fourth baffle, and the third direction is the direction facing away from the inner surface of the bottom plate.

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