Combined welding device for batteries

Abstract

The invention discloses a combined welding device for batteries, and relates to the technical field of battery welding. The device comprises a supporting table which can move horizontally and is used for placing a battery pack; a welding part is arranged on the upper portion and comprises two welding heads with the adjustable distance, and the nickel sheet and the electrode are welded through resistance heat; the welding head achieves accurate pressure control through a downward pressing sliding rod, an electromagnet and a tension spring system, and welding stability is ensured. The device adopts an electric cylinder, a driving motor and a centrifugal force adjusting mechanism to flexibly adjust the distance between a welding head and an electrode to adapt to different battery cell sizes; transverse and longitudinal sliding rods are matched to realize convenient positioning of the battery pack; the device is compact in structure, flexible to operate, capable of remarkably improving the welding efficiency and quality and suitable for welding requirements of various battery packs.

Description

Technical Field

[0001] The invention relates to the technical field of battery welding, in particular to a combined welding device for a battery. Background Art

[0002] Existing battery combination welding devices usually use fixed welding heads, and the welding position and pressure are adjusted manually or by simple mechanical structures. They are widely used in welding electrodes and nickel sheets of battery packs. However, the existing technology has significant disadvantages. First, the spacing between the welding heads is difficult to adjust, and it is difficult to adapt to battery packs with different cell diameters, which limits the versatility of the device. Secondly, the pressure control of the nickel sheet and the electrode during welding is not accurate, and the welding point is often not firm due to insufficient contact area, affecting the electrical performance and safety of the battery pack. Third, when adjusting the distance between the welding head and the electrode, the existing device relies on manual operation or simple mechanical lifting, and the adjustment range is limited, which cannot meet the welding requirements of non-standard cells. Fourth, the horizontal positioning of the battery pack mostly relies on manual handling, which is inefficient and labor-intensive, especially for large battery packs. These shortcomings cause the existing welding devices to exhibit poor adaptability, low efficiency and unstable quality when dealing with the welding needs of diversified battery packs. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a combined welding device for batteries, comprising a support platform that can move horizontally, the support platform is used to place the battery group to be welded, a welding part is arranged above the support platform, the welding part comprises two parallel welding heads, the two welding heads are used to weld the nickel sheet and the battery electrode together by resistance heat; the two welding heads are respectively slidably mounted on two welding head adjustment plates, each welding head adjustment plate is fixedly mounted with four downward pressing sliding rods, each downward pressing sliding rod is surrounded by a downward pressing tension spring and a retaining tension spring, all the downward pressing sliding rods are slidably mounted on the downward pressing support plate, wherein the two ends of the retaining tension spring are fixedly matched with the welding head adjustment plate and the downward pressing support plate, one end of the downward pressing tension spring is fixed to the downward pressing support plate, the other end of the downward pressing tension spring is fixed with an electromagnet, the electromagnet is slidably sleeved on the downward pressing sliding rod, and a passive suction ring is fixed at one end of the downward pressing sliding rod away from the welding head adjustment plate, and the passive suction ring cooperates with the magnetic force of the electromagnet.

[0004] Preferably, each welding head adjustment plate is provided with a slide rail, the top end of the welding head is slidably installed inside the slide rail, and the top end of the welding head is fixedly matched with the welding head adjustment plate through a nut locking assembly, so that the position of the welding head inside the slide rail can be adjusted, thereby realizing the adjustment of the distance between the two welding heads.

[0005] Preferably, the downward pressure support plate is fixedly mounted on the bow-shaped frame, the bow-shaped frame is slidably mounted on the welding frame, an electric cylinder is also fixedly mounted on the welding frame, and the end of the telescopic rod of the electric cylinder is movably connected to the bow-shaped frame through a connecting rod; an insulating partition is also fixedly mounted in the middle of the lower surface of the downward pressure support plate, and the insulating partition is used to separate the two welding head adjustment plates.

[0006] Preferably, the welding frame is fixedly mounted on the welding arm, the welding arm is slidably mounted on two parallel vertical sliding rods, the two vertical sliding rods are fixedly mounted on the base frame, the first drive motor is also fixedly mounted on the base frame, and a rotating shaft is fixedly mounted on the output shaft of the first drive motor, wherein the welding arm and the rotating shaft are slidably matched.

[0007] Preferably, a protective cover is fixedly mounted on the base frame, and the protective cover is sleeved on the outside of the rotating shaft and the two vertical sliding rods. The inner wall top surface of the protective cover is fixedly matched with the top ends of the two vertical sliding rods, and the inner wall top surface of the protective cover is rotationally matched with the top end of the rotating shaft.

[0008] Preferably, a fixed collar is fixedly mounted on the top of the rotating shaft, a spline collar is rotatably mounted on the welding arm, and the spline collar is sleeved on the rotating shaft in a spline sliding manner, wherein the spline collar rotates circumferentially on the welding arm.

[0009] Preferably, a plurality of elastic strips are elastically connected between the opposite surfaces of the fixed collar and the spline collar in a circular equidistant array, a counterweight block is fixedly mounted in the middle of each elastic strip, and an inclined surface is arranged on the counterweight block.

[0010] Preferably, a bottom frame is fixedly installed on the base frame, and two parallel transverse sliding rods are fixedly installed on the inner side of the bottom frame. Both transverse sliding rods are slidably sleeved with transverse sliding sleeves, and two parallel longitudinal sliding rods are fixedly installed between the two transverse sliding sleeves, and bottom sliding platforms are slidably installed on the two longitudinal sliding rods.

[0011] Preferably, four support platform guide rods are fixedly installed on the lower surface of the support platform, and the four support platform guide rods are slidably matched with the bottom sliding table plate. A threaded sleeve is fixedly installed at the center position of the lower surface of the support platform, and the threaded sleeve is slidably matched with the bottom sliding table plate. A screw rod is threadedly inserted in the axial position of the threaded sleeve, and the screw rod is fixedly installed on the output shaft of the second drive motor. The second drive motor is suspended and fixed to the lower surface of the bottom sliding table plate through a second drive motor bracket.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can accurately adjust the distance between the two welding heads through the sliding adjustment of the welding head in the slide rail and the fixing of the nut locking assembly to adapt to battery packs with different cell diameters. Compared with the fixed or manually adjusted welding heads in the prior art, the present invention significantly improves the versatility of the device, avoids the problem of replacing equipment or re-debugging due to changes in the cell size, reduces production costs, improves welding efficiency, and is particularly suitable for the production needs of diversified battery packs; (2) The present invention adopts an electromagnet, a downward pressing sliding rod and a downward pressing tension spring system to drive the welding head downward by electromagnetic force before welding, apply uniform pressure, and ensure that the nickel sheet is fully in contact with the electrode. Compared with the problem of inaccurate pressure control and insufficient contact area in the prior art, the present invention significantly improves the firmness of the welding point and the stability of the current path through the elastic force adjustment of the tension spring and the dynamic control of the electromagnet, reduces the welding defect rate, and improves the safety and service life of the battery pack; (3) The present invention can flexibly adjust the vertical distance between the welding head and the electrode through the electric cylinder, the first drive motor and the centrifugal force adjustment mechanism, combined with the dynamic movement of the spline ring and the elastic strip. Compared with the single lifting and lowering adjustment method in the prior art, the present invention achieves a wider range of distance adaptability through multi-level adjustment (electric cylinder sliding, motor-driven centrifugal force adjustment), which is particularly suitable for welding non-standard battery cells with large length changes, and enhances the flexibility and production adaptability of the device; (4) The present invention is equipped with a horizontal slide bar, a longitudinal slide bar and a bottom sliding table, and cooperates with the sliding design of the support table to achieve rapid horizontal positioning of the battery pack. Compared with the large battery pack positioning method in the prior art that relies on manual handling, the present invention significantly improves the positioning efficiency through a mechanical sliding structure, reduces the labor intensity of operators, and is particularly suitable for the welding process of large battery packs, improving the automation level and overall production efficiency of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the bottom frame of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the structure at A in the middle; Figure 4 It is a structural schematic diagram of the threaded casing of the present invention; Figure 5 It is a structural schematic diagram of the welding joint of the present invention.

[0014] In the figure: 101-base frame; 102-protective cover; 103-first drive motor; 104-vertical sliding rod; 105-welding arm; 106-welding frame; 107-rotating shaft; 108-spline collar; 109-insulating partition; 110-counterweight block; 111-inclined surface; 112-elastic strip; 113-fixing collar; 114-bottom frame; 115-lateral sliding rod; 116-lateral sliding sleeve; 117-longitudinal sliding rod; 118-bottom sliding table; 119-support Table; 120-support table guide rod; 121-threaded sleeve; 122-screw rod; 123-second drive motor; 124-second drive motor bracket; 125-electric cylinder; 126-connecting rod; 127-bow frame; 128-downward support plate; 129-downward sliding rod; 130-passive suction ring; 131-electromagnet; 132-downward tension spring; 133-holding tension spring; 134-welding head adjustment plate; 135-welding head; 136-nut locking assembly; 137-slide rail. DETAILED DESCRIPTION

[0015] The following is combined with Figure 1-5 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0016] The present invention provides a combined welding device for batteries, comprising a support platform 119 capable of horizontal movement, the support platform 119 being used to place a battery pack to be welded, a welding portion being arranged above the support platform 119, the welding portion comprising two parallel welding heads 135, the two welding heads 135 being used to weld a nickel sheet and a battery electrode together by means of resistance heat; the two welding heads 135 are respectively slidably mounted on two welding head adjustment plates 134, each welding head adjustment plate 134 being fixedly mounted with four downward pressing sliding rods 129, each downward pressing sliding rod 129 being surrounded by a downward pressing tension spring 132 and a retaining tension spring 133, all the downward pressing sliding rods 129 are slidably installed on the downward pressing support plate 128, wherein the two ends of the retaining tension spring 133 are fixedly matched with the welding head adjustment plate 134 and the downward pressing support plate 128, one end of the downward pressing tension spring 132 is fixed to the downward pressing support plate 128, and the other end of the downward pressing tension spring 132 is fixed with an electromagnet 131, the electromagnet 131 is slidably sleeved on the downward pressing sliding rod 129, and a passive suction ring 130 is fixed at one end of the downward pressing sliding rod 129 away from the welding head adjustment plate 134, and the passive suction ring 130 cooperates with the electromagnet 131 magnetically. Each welding head adjustment plate 134 is provided with a slide rail 137, and the top end of the welding head 135 is slidably mounted inside the slide rail 137, and the top end of the welding head 135 is fixedly matched with the welding head adjustment plate 134 through a nut locking assembly 136, so that the position of the welding head 135 inside the slide rail 137 can be adjusted to achieve the adjustment of the distance between the two welding heads 135. The downward pressure support plate 128 is fixedly mounted on the bow frame 127, and the bow frame 127 is slidably mounted on the welding frame 106. The welding frame 106 is also fixedly mounted with an electric cylinder 125, and the end of the telescopic rod of the electric cylinder 125 is movably connected to the bow frame 127 through a connecting rod 126; wherein the middle part of the lower surface of the downward pressure support plate 128 is also fixedly mounted with an insulating partition 109, and the insulating partition 109 is used to separate the two welding head adjustment plates 134. The welding frame 106 is fixedly mounted on the welding arm 105, and the welding arm 105 is slidably mounted on two parallel vertical sliding rods 104, and the two vertical sliding rods 104 are fixedly mounted on the base frame 101. The first driving motor 103 is also fixedly mounted on the base frame 101, and the rotating shaft 107 is fixedly mounted on the output shaft of the first driving motor 103, wherein the welding arm 105 is slidably matched with the rotating shaft 107. The base frame 101 is also fixedly mounted with a protective cover 102, which is sleeved on the outer side of the rotating shaft 107 and the two vertical sliding rods 104, and the inner wall top surface of the protective cover 102 is fixedly matched with the top ends of the two vertical sliding rods 104, and the inner wall top surface of the protective cover 102 is rotatably matched with the top end of the rotating shaft 107. A fixed ring 113 is fixedly installed on the top of the rotating shaft 107, and a spline ring 108 is rotatably installed on the welding arm 105. The spline ring 108 is sleeved on the rotating shaft 107 in a spline sliding manner, wherein the spline ring 108 can only rotate circumferentially on the welding arm 105 and cannot move circumferentially.A plurality of elastic strips 112 are elastically connected between the fixed collar 113 and the opposite surfaces of the spline collar 108 in a circular equidistant array, and a counterweight block 110 is fixedly installed in the middle of each elastic strip 112, and an inclined surface 111 is provided on the counterweight block 110. A bottom frame 114 is fixedly installed on the bottom frame 101, and two parallel transverse sliding rods 115 are fixedly installed on the inner side of the bottom frame 114, and transverse sliding sleeves 116 are slidably sleeved on the two transverse sliding rods 115, and two parallel longitudinal sliding rods 117 are fixedly installed between the two transverse sliding sleeves 116, and bottom sliding platforms 118 are slidably installed on the two longitudinal sliding rods 117. Four support platform guide rods 120 are fixedly installed on the lower surface of the support platform 119, and the four support platform guide rods 120 are slidably matched with the bottom sliding table 118. A threaded sleeve 121 is fixedly installed at the center position of the lower surface of the support platform 119, and the threaded sleeve 121 is slidably matched with the bottom sliding table 118. A screw rod 122 is threadedly inserted in the axial position of the threaded sleeve 121. The screw rod 122 is fixedly installed on the output shaft of the second drive motor 123. The second drive motor 123 is suspended and fixed to the lower surface of the bottom sliding table 118 through a second drive motor bracket 124.

[0017] The working principle of a combined welding device for a battery disclosed in the present invention is as follows: place the battery pack on a support table 119 (the battery pack is composed of multiple battery cells), first weld and connect one side of the electrode of the battery pack through a nickel sheet, and then turn it over to weld the inner side of the electrode (the welding method can be customized according to needs, whether in series or parallel). Due to the different welding positions, it is necessary to align the welding point with the welding head 135, and the welding head 135 with the electrode of the battery, and adjust the distance between the two welding heads 135 according to the different diameters of the battery cells. When welding, apply current to the two welding heads 135 (usually 1000~5000A, when passing through the metal contact surface in a short time (1~10ms), the contact resistance and the metal body resistance work together to generate Joule heat).

[0018] During welding, the two welding heads 135 need to clamp the nickel sheet between the electrodes of the two battery cells. This requires controlling the first drive motor 103. The first drive motor 103 drives the two welding heads 135 to move vertically so that the welding heads 135 press the nickel sheet onto the electrode. Then, the two welding heads 135 are energized to melt the nickel sheet and the electrode material through Joule heat, thereby welding them together. In order to ensure the stability of welding and the stability of the current path, it is necessary to apply pressure to the welding head 135 before the welding head 135 is energized, so that the welding head 135 can squeeze the nickel sheet onto the electrode (increase the actual contact area, because if it is not squeezed, it will cause bumps on the surface between the nickel sheet and the electrode, resulting in a decrease in the actual contact area). The shading process requires starting all the electromagnets 131. The electromagnet 131 generates magnetic force to attract the passive suction ring 130. After the passive suction ring 130 is attracted by the electromagnet 131, it will drive the downward pressing sliding rod 129 to move downward. In this process, the downward pressing sliding rod 129 will drive the welding head adjustment plate 134 to move downward, and the welding head adjustment plate 134 will drive the welding head 135 to move downward, so that the welding head 135 is in contact with the nickel sheet. At the same time, due to the existence of the downward pressure spring 132, when the passive suction ring 130 and the electromagnet 131 attract each other, the electromagnet 131 will pull the downward pressure spring 132, causing the downward pressure spring 132 to stretch and deform (the elastic force of the downward pressure spring 132 is greater than the elastic force of the retaining spring 133, and the retaining spring 133 provided here is only used to maintain the distance between the welding head adjustment plate 134 and the downward pressure support plate 128 when the electromagnet 131 is not energized, thereby playing a resetting role). At this time, the downward pressure sliding rod 129 will be subjected to the tensile force of the passive suction ring 130 and the electromagnet 131 from the downward pressure spring 132, and this tensile force will be transmitted to the welding head 135 through the welding head adjustment plate 134, thereby allowing the welding head 135 to squeeze the nickel sheet onto the battery motor.

[0019] To change the position of the electrodes of the battery cells at different positions of the battery pack, it is only necessary to drag the bottom sliding table 118 and the support table 119. By sliding the transverse sliding sleeve 116 on the transverse sliding rod 115 and the bottom sliding table 118 on the longitudinal sliding rod 117, the horizontal movement of the battery pack can be achieved (if the battery pack is very large, manual transportation is very laborious); according to the length of each battery cell in the battery pack, the second drive motor 123 is controlled, the second drive motor 123 drives the screw rod 122 to rotate, the screw rod 122 drives the threaded sleeve 121 to axially displace the screw rod 122, and the threaded sleeve 121 drives the support table 119 to move, thereby adjusting the distance between the support table 119 and the bottom sliding table 118, that is, the distance between the support table 119 and the welding head 135 (such as welding battery packs with different lengths of batteries), ensuring the distance between the welding head 135 and the electrode (the welding head 135 can be driven to move downward by pressing the sliding rod 129 downward, and contact and squeeze the electrode). Alternatively, the electric cylinder 125 is controlled, and the telescopic rod of the electric cylinder 125 drives the bow frame 127 to slide on the welding frame 106 through the connecting rod 126, thereby changing the distance between the welding head 135 and the electrode and increasing the adjustment range.

[0020] If the length variation of the battery cell is large, the first drive motor 103 is started at this time (under normal conditions, the first drive motor 103 is in a stopped state, so that the welding arm 105 is maintained at a default height, at which the distance between the welding head 135 and the electrode can be suitable for most conventional battery cell models). When welding non-standard battery cells, the first drive motor 103 is started, and the output shaft of the first drive motor 103 drives the rotating shaft 107 to rotate, and the rotating shaft 107 drives the spline ring 108 and the fixed ring 113 to rotate, and the spline ring 108 and the fixed ring 113 drive the elastic strip 112 to rotate, and the counterweight block 110 on the elastic strip 112 will rotate. The rotation of the counterweight block 110 will be subjected to centrifugal force, and the elastic strip 112 will be pulled outward by the centrifugal force. As a result, the distance between the spline ring 108 and the fixed ring 113 is reduced, and the welding arm 105 is driven to slide upward on the vertical sliding rod 104. At the same time, in addition to the centrifugal force, the counterweight block 110 is also subjected to air resistance under the action of the inclined surface 111, which includes air resistance in the same direction as the centrifugal force (the component of resistance). The welding arm 105 drives the welding frame 106 to move, and the welding frame 106 drives the two welding heads 135 on the welding head adjustment plate 134 to move, so as to adjust the distance between the welding head 135 and the electrode (it is necessary to keep the speed of the output shaft of the first drive motor 103 constant to ensure that the welding head 135 stays at a certain position, and the greater the speed of the output shaft of the first drive motor 103, the greater the displacement of the welding head 135).

Claims

1. A combined welding device for a battery, characterized in that: It comprises a support platform (119) capable of horizontal movement, the support platform (119) is used to place a battery pack to be welded, a welding portion is arranged above the support platform (119), the welding portion comprises two parallelly arranged welding heads (135), and the two welding heads (135) are used to weld the nickel sheet and the battery electrode together by means of resistance heat; The two welding heads (135) are respectively slidably mounted on the two welding head adjustment plates (134), and four downward pressing sliding rods (129) are fixedly mounted on each welding head adjustment plate (134). Each downward pressing sliding rod (129) is surrounded by a downward pressing tension spring (132) and a retaining tension spring (133). All the downward pressing sliding rods (129) are slidably mounted on the downward pressing support plate (128), wherein the two ends of the retaining tension spring (133) are in contact with the welding head adjustment plate (134). ) and a downward pressing support plate (128) are fixedly matched, one end of the downward pressing tension spring (132) is fixed to the downward pressing support plate (128), the other end of the downward pressing tension spring (132) is fixed with an electromagnet (131), the electromagnet (131) is slidably sleeved on the downward pressing sliding rod (129), and a passive suction ring (130) is fixed to one end of the downward pressing sliding rod (129) away from the welding head adjustment plate (134), and the passive suction ring (130) and the electromagnet (131) are magnetically matched.

2. A battery combined welding device according to claim 1, characterized in that: Each welding head adjustment plate (134) is provided with a slide rail (137), and the top end of the welding head (135) is slidably mounted inside the slide rail (137). The top end of the welding head (135) is fixedly matched with the welding head adjustment plate (134) via a nut locking assembly (136), so that the position of the welding head (135) inside the slide rail (137) can be adjusted, thereby achieving adjustment of the distance between the two welding heads (135).

3. A battery combined welding device according to claim 2, characterized in that: The pressing support plate (128) is fixedly mounted on the arch frame (127), the arch frame (127) is slidably mounted on the welding frame (106), an electric cylinder (125) is also fixedly mounted on the welding frame (106), and the end of the telescopic rod of the electric cylinder (125) is movably connected to the arch frame (127) via a connecting rod (126); an insulating partition (109) is also fixedly mounted in the middle of the lower surface of the pressing support plate (128), and the insulating partition (109) is used to separate the two welding head adjustment plates (134).

4. A battery combined welding device according to claim 3, characterized in that: The welding frame (106) is fixedly mounted on the welding arm (105), the welding arm (105) is slidably mounted on two parallel vertical sliding rods (104), the two vertical sliding rods (104) are fixedly mounted on the base frame (101), a first driving motor (103) is also fixedly mounted on the base frame (101), a rotating shaft (107) is fixedly mounted on the output shaft of the first driving motor (103), wherein the welding arm (105) and the rotating shaft (107) are slidably matched.

5. A battery combined welding device according to claim 4, characterized in that: A protective cover (102) is also fixedly mounted on the base frame (101). The protective cover (102) is sleeved on the outer sides of the rotating shaft (107) and the two vertical sliding rods (104). The top surface of the inner wall of the protective cover (102) is fixedly matched with the top ends of the two vertical sliding rods (104). The top surface of the inner wall of the protective cover (102) is rotationally matched with the top end of the rotating shaft (107).

6. A battery combined welding device according to claim 5, characterized in that: A fixed collar (113) is fixedly mounted on the top of the rotating shaft (107), and a spline collar (108) is rotatably mounted on the welding arm (105). The spline collar (108) is sleeved on the rotating shaft (107) in a spline sliding manner, wherein the spline collar (108) rotates circumferentially on the welding arm (105).

7. A battery combined welding device according to claim 6, characterized in that: A plurality of elastic strips (112) are elastically connected between the opposite surfaces of the fixed collar (113) and the spline collar (108) in a circular equidistant array, a counterweight (110) is fixedly mounted in the middle of each of the elastic strips (112), and an inclined surface (111) is provided on the counterweight (110).

8. A battery combined welding device according to claim 7, characterized in that: A bottom frame (114) is fixedly mounted on the bottom frame (101), two parallel transverse sliding rods (115) are fixedly mounted on the inner side of the bottom frame (114), transverse sliding sleeves (116) are slidably sleeved on the two transverse sliding rods (115), two parallel longitudinal sliding rods (117) are fixedly mounted between the two transverse sliding sleeves (116), and bottom sliding platforms (118) are slidably mounted on the two longitudinal sliding rods (117).

9. A battery combined welding device according to claim 8, characterized in that: Four support platform guide rods (120) are fixedly mounted on the lower surface of the support platform (119), and the four support platform guide rods (120) are slidably matched with the bottom sliding platform (118). A threaded sleeve (121) is fixedly mounted at the center position of the lower surface of the support platform (119), and the threaded sleeve (121) is slidably matched with the bottom sliding platform (118). A screw rod (122) is threadedly inserted at the axis position of the threaded sleeve (121), and the screw rod (122) is fixedly mounted on the output shaft of the second drive motor (123). The second drive motor (123) is suspended and fixed on the lower surface of the bottom sliding platform (118) through a second drive motor bracket (124).

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