A combined welding device for a battery

Abstract

The present invention discloses a combined welding device for batteries, which relates to the technical field of battery welding; the present invention includes a support platform that can move horizontally and is used to place the battery pack; a welding part is arranged above, including two welding heads with adjustable spacing, and the nickel sheet and the electrode are welded through resistance heat; the welding head realizes precise pressure control through a downward pressing sliding rod, an electromagnet and a tension spring system to ensure welding stability; the device adopts an electric cylinder, a driving motor and a centrifugal force adjustment mechanism to flexibly adjust the distance between the welding head and the electrode to adapt to different cell sizes; the cooperation of the horizontal and vertical sliding rods realizes convenient positioning of the battery pack; the structure of the present invention is compact and the operation is flexible, significantly improving the welding efficiency and quality, and is suitable for the welding requirements of various battery packs.

Description

Technical Field

[0001] The present invention relates to the technical field of battery welding, and particularly to a combined welding device for batteries. Background Art

[0002] Existing combined battery welding devices usually adopt fixed welding heads, and adjust the welding position and pressure manually or through simple mechanical structures, which are widely used in the welding of electrodes and nickel sheets of battery packs. However, the existing technology has significant drawbacks. First, it is difficult to adjust the distance between the welding heads, and it is difficult to adapt to battery packs with different cell diameters, which limits the versatility of the device. Second, the pressure control of the nickel sheet and the electrode during the welding process is not accurate enough, and the welding points are 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 of the existing device, it relies on manual operation or simple mechanical lifting, and the adjustment range is limited, unable to 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 drawbacks result in poor adaptability, low efficiency, and unstable quality of the existing welding device when dealing with the welding requirements of diverse battery packs. Summary of the Invention

[0003] To overcome the defects of the above-mentioned existing technology, the present invention provides the following technical solution: A combined welding device for batteries, including a support table capable of horizontal movement, on which the battery pack to be welded is placed. Above the support table, there is a welding part, and the welding part includes two parallel welding heads, which are used to weld the nickel sheet and the battery electrode together by means of resistance heat; the two welding heads are respectively slidably installed on two welding head adjusting plates, and four downward pressure sliding rods are fixedly installed on each welding head adjusting plate. A downward pressure tension spring and a holding tension spring are wound around each downward pressure sliding rod. All the downward pressure sliding rods are slidably installed on a downward pressure support plate. Among them, both ends of the holding tension spring are fixedly matched with the welding head adjusting plate and the downward pressure support plate. One end of the downward pressure tension spring is fixed to the downward pressure support plate, and the other end of the downward pressure tension spring is fixed with an electromagnet. The electromagnet is slidably sleeved on the downward pressure sliding rod, and a passive suction ring is fixed at the end of the downward pressure sliding rod away from the welding head adjusting plate, and the passive suction ring is magnetically matched with the electromagnet.

[0004] Preferably, a slide rail is provided on each welding head adjusting plate, and 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 adjusting plate through a nut locking assembly, so that the position of the welding head inside the slide rail can be adjusted to realize the adjustment of the distance between the two welding heads.

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

[0006] Preferably, the welding frame is fixedly installed on the welding arm, the welding arm is slidably installed on two vertically arranged parallel sliding rods, the two vertically arranged parallel sliding rods are fixedly installed on the chassis, and a first driving motor is also fixedly installed on the chassis. A rotating shaft is fixedly installed on the output shaft of the first driving motor. Among them, the welding arm is slidably matched with the rotating shaft.

[0007] Preferably, a protective cover is also fixedly installed on the chassis, the protective cover is sleeved outside the rotating shaft and the two vertically arranged parallel sliding rods, the top surface of the inner wall of the protective cover is fixedly matched with the top ends of the two vertically arranged parallel sliding rods, and the top surface of the inner wall of the protective cover is rotatably matched with the top end of the rotating shaft.

[0008] Preferably, a fixed collar is fixedly installed at the top end of the rotating shaft, a spline collar is rotatably installed on the welding arm, and the spline collar is sleeved on the rotating shaft in a spline sliding manner. Among them, 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 manner. A counterweight block is fixedly installed in the middle of each elastic strip, and an inclined surface is provided on the counterweight block.

[0010] Preferably, a bottom frame is fixedly installed on the chassis, two horizontally arranged parallel sliding rods are fixedly installed inside the bottom frame, horizontal sliding sleeves are slidably sleeved on the two horizontally arranged parallel sliding rods, two vertically arranged parallel sliding rods are fixedly installed between the two horizontal sliding sleeves, and a bottom sliding table plate is slidably installed on the two vertically arranged parallel sliding rods.

[0011] Preferably, four support table guide rods are fixedly installed on the lower surface of the support table, the four support table 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 table, the threaded sleeve is slidably matched with the bottom sliding table plate, a lead screw is threadedly inserted and driven at the axis position of the threaded sleeve, and the lead screw is fixedly installed on the output shaft of the second driving motor. The second driving motor is fixedly installed under the bottom sliding table plate through the second driving motor bracket in an overhead manner.

[0012] The present invention has the following beneficial effects compared with the prior art: (1) By sliding and adjusting the welding heads within the slide rails and fixing them with the nut locking assembly, the present invention can accurately adjust the distance between the two welding heads to adapt to battery packs with different cell diameters. Compared with the fixed or manually adjustable welding heads in the prior art, the present invention significantly improves the versatility of the device, avoids the problems of equipment replacement or re - debugging due to changes in cell size, reduces production costs, improves welding efficiency, and is particularly suitable for the production requirements of diversified battery packs; (2) The present invention adopts an electromagnet, a downward - pressing sliding rod, and a downward - pressing tension spring system. Before welding, the welding heads are driven downward by electromagnetic force to apply uniform pressure, ensuring full contact between the nickel sheets and the electrodes. Compared with the problems of inaccurate pressure control and insufficient contact area in the prior art, through the elastic force adjustment of the tension spring and the dynamic control of the electromagnet, the present invention significantly improves the firmness of the welding points and the stability of the current path, reduces the welding defect rate, and improves the safety and service life of the battery pack; (3) Through the electric cylinder, the first driving motor, and the centrifugal force adjustment mechanism, combined with the dynamic movement of the spline sleeve ring and the elastic strip, the present invention can flexibly adjust the vertical distance between the welding heads and the electrodes. Compared with the single lifting adjustment method in the prior art, the present invention realizes a greater range of distance adaptability through multi - level adjustment (electric cylinder sliding, motor - driven centrifugal force adjustment), is particularly suitable for welding non - standard 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 vertical slide bar, and a bottom sliding platen. With the sliding design of the support table, it realizes the rapid horizontal positioning of the battery pack. Compared with the large - battery - pack positioning method relying on manual handling in the prior art, the present invention significantly improves the positioning efficiency through the mechanical sliding structure, reduces the labor intensity of the operators, is particularly applicable to the welding process of large - battery packs, and improves the automation level and overall production efficiency of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 is a schematic diagram of the structure at the bottom frame of the present invention;

[0015] Figure 3 is of the present invention Figure 2 schematic diagram of the structure at position A in;

[0016] Figure 4 is a schematic diagram of the structure at the threaded sleeve of the present invention;

[0017] Figure 5 is a schematic diagram of the structure at the welding head of the present invention.

[0018] In the figure: 101 - chassis; 102 - protective cover; 103 - first driving motor; 104 - vertical sliding rod; 105 - welding arm; 106 - welding frame; 107 - rotating shaft; 108 - spline collar; 109 - insulating partition; 110 - counterweight; 111 - inclined plane; 112 - elastic strip; 113 - fixed collar; 114 - bottom frame; 115 - horizontal sliding rod; 116 - horizontal sliding sleeve; 117 - longitudinal sliding rod; 118 - bottom sliding table board; 119 - support platform; 120 - support platform guide rod; 121 - threaded sleeve; 122 - lead screw; 123 - second driving motor; 124 - second driving motor bracket; 125 - electric cylinder; 126 - connecting rod; 127 - bow-shaped frame; 128 - downward pressure support plate; 129 - downward pressure sliding rod; 130 - passive suction ring; 131 - electromagnet; 132 - downward pressure tension spring; 133 - holding tension spring; 134 - welding head adjusting plate; 135 - welding head; 136 - nut locking assembly; 137 - slide rail. Detailed implementation manners

[0019] The following is combined with the attached Figures 1-5 drawings, and the technical solution of the present invention will be further described through specific implementation manners.

[0020] The present invention provides a combined welding device for batteries, including a support table 119 capable of horizontal movement. The support table 119 is used to place the battery pack to be welded. Above the support table 119, there is a welding part, which includes two parallel welding heads 135. 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 installed on two welding head adjusting plates 134. Four downward pressing sliding rods 129 are fixedly installed on each welding head adjusting plate 134. A downward pressing spring 132 and a holding spring 133 are wound around each downward pressing sliding rod 129. All the downward pressing sliding rods 129 are slidably installed on a downward pressing support plate 128. The two ends of the holding spring 133 are fixedly engaged with the welding head adjusting plate 134 and the downward pressing support plate 128. One end of the downward pressing spring 132 is fixed to the downward pressing support plate 128, and an electromagnet 131 is fixed to the other end of the downward pressing spring 132. The electromagnet 131 is slidably sleeved on the downward pressing sliding rod 129, and a passive suction ring 130 is fixed to the end of the downward pressing sliding rod 129 away from the welding head adjusting plate 134. The passive suction ring 130 is magnetically engaged with the electromagnet 131. A slide rail 137 is provided on each welding head adjusting plate 134. The top end of the welding head 135 is slidably installed inside the slide rail 137, and the top end of the welding head 135 is fixedly engaged with the welding head adjusting 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 realize the adjustment of the distance between the two welding heads 135. The downward pressing support plate 128 is fixedly installed on an arch-shaped frame 127. The arch-shaped frame 127 is slidably installed on a welding frame 106. An electric cylinder 125 is also fixedly installed on the welding frame 106. The end of the telescopic rod of the electric cylinder 125 is movably connected to the arch-shaped frame 127 through a connecting rod 126. The middle of the lower surface of the downward pressing support plate 128 is also fixedly installed with an insulating partition 109, and the insulating partition 109 is used to separate the two welding head adjusting plates 134. The welding frame 106 is fixedly installed on a welding arm 105. The welding arm 105 is slidably installed on two parallel vertical sliding rods 104. The two vertical sliding rods 104 are fixedly installed on a base frame 101. A first driving motor 103 is also fixedly installed on the base frame 101. A rotating shaft 107 is fixedly installed on the output shaft of the first driving motor 103. The welding arm 105 is slidably engaged with the rotating shaft 107. A protective cover 102 is also fixedly installed on the base frame 101. The protective cover 102 is sleeved outside 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 engaged with the top ends of the two vertical sliding rods 104. The top surface of the inner wall of the protective cover 102 is rotatably engaged with the top end of the rotating shaft 107. A fixed collar 113 is fixedly installed at the top end of the rotating shaft 107. A spline collar 108 is rotatably installed on the welding arm 105. The spline collar 108 is sleeved on the rotating shaft 107 in a spline sliding manner. The spline collar 108 can only rotate circumferentially on the welding arm 105 and cannot move circumferentially.A plurality of elastic strips 112 are elastically connected in a circular equidistant array between the opposite surfaces of the fixed collar 113 and the spline collar 108. A counterweight 110 is fixedly installed in the middle of each elastic strip 112, and an inclined surface 111 is provided on the counterweight 110. A bottom frame 101 is fixedly installed with a bottom border 114, and two horizontally sliding rods 115 arranged in parallel are fixedly installed inside the bottom border 114. Horizontally sliding sleeves 116 are slidably sleeved on both of the two horizontally sliding rods 115. Two vertically sliding rods 117 arranged in parallel are fixedly installed between the two horizontally sliding sleeves 116. A bottom sliding table plate 118 is slidably installed on the two vertically sliding rods 117. Four support platform guide rods 120 are fixedly installed on the lower surface of the support platform 119. The four support platform guide rods 120 are in sliding fit with the bottom sliding table plate 118. A threaded sleeve 121 is fixedly installed at the central position of the lower surface of the support platform 119. The threaded sleeve 121 is in sliding fit with the bottom sliding table plate 118. A lead screw 122 is threadedly inserted and driven at the axial position of the threaded sleeve 121. The lead screw 122 is fixedly installed on the output shaft of the second drive motor 123. The second drive motor 123 is fixedly installed on the lower surface of the bottom sliding table plate 118 in a suspended manner through the second drive motor bracket 124.

[0021] The working principle of a battery combination welding device disclosed in the present invention is as follows: Place the battery pack on the support platform 119 (the battery pack is composed of a plurality of battery cells). First, weld and connect one side electrode of the battery pack through a nickel sheet, and then turn it over to weld the other side electrode (the welding method of series or parallel can be customarily selected according to needs). Due to different welding positions, it is necessary to align the welding point with the welding head 135, and align the welding head 135 with the electrode of the battery. According to the different diameters of the battery cells, adjust the distance between the two welding heads 135. Apply current to the two welding heads 135 during welding (usually 1000 - 5000A. When passing through the metal contact surface in a short time (1 - 10ms), Joule heat is generated by the combined action of the contact resistance and the metal body resistance).

[0022] During welding, it is necessary to let the two welding heads 135 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 against the electrodes. Then, the two welding heads 135 are powered on, and the nickel sheet and the electrode material are melted by Joule heat, so as to be welded together. To ensure the stability of welding and the stability of the current path, it is necessary to apply pressure to the welding heads 135 before they are powered on, so that the welding heads 135 squeeze the nickel sheet against the electrodes (increasing the actual contact area, because without squeezing, there will be microscopic unevenness between the nickel sheet and the electrodes, resulting in a decrease in the actual contact area). During the shading process, all the electromagnets 131 need to be activated. The electromagnets 131 generate magnetic force to attract the passive suction ring 130. After the passive suction ring 130 is attracted by the electromagnets 131, it will drive the downward pressure sliding rod 129 to move downward. During this process, the downward pressure 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 heads 135 to move downward, so that the welding heads 135 contact 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 electromagnets 131 attract each other, the electromagnets 131 will pull the downward pressure spring 132, causing the downward pressure spring 132 to be stretched and deformed (the elastic force of the downward pressure spring 132 is greater than the elastic force of the holding spring 133. The holding spring 133 set here is only used to maintain the distance between the welding head adjustment plate 134 and the downward pressure support plate 128 when the electromagnets 131 are not powered on, playing a role in resetting). At this time, the downward pressure sliding rod 129 will be subjected to the pulling force from the passive suction ring 130 and the electromagnets 131 on the downward pressure spring 132. This pulling force will be transmitted to the welding heads 135 through the welding head adjustment plate 134, so that the welding heads 135 squeeze the nickel sheet against the battery electrodes.

[0023] To change the positions of the electrodes of the battery cells at different positions of the battery pack, only need to drag the bottom sliding platen 118 and the support platen 119. Through the sliding of the horizontal sliding sleeve 116 on the horizontal sliding rod 115 and the sliding of the bottom sliding platen 118 on the vertical sliding rod 117, the horizontal movement of the battery pack can be achieved (if the battery pack is very large, manual handling is very laborious); according to the length of each battery cell of the battery pack, control the second driving motor 123. The second driving motor 123 drives the screw rod 122 to rotate, and the screw rod 122 drives the threaded sleeve 121 to displace axially on the screw rod 122. The threaded sleeve 121 drives the support platen 119 to move, so as to adjust the distance between the support platen 119 and the bottom sliding platen 118, that is, the distance between the support platen 119 and the welding head 135 (such as welding battery packs with different lengths of battery cells), and ensure the distance between the welding head 135 and the electrode (it can drive the welding head 135 to move downward by the sliding of the pressing sliding rod 129, and contact and press the electrode). Or control the electric cylinder 125. The telescopic rod of the electric cylinder 125 drives the bow-shaped frame 127 to slide on the welding frame 106 through the connecting rod 126, so as to change the distance between the welding head 135 and the electrode and increase the adjustment range.

[0024] If the change in the length of the battery cells of the battery pack is very large, start the first driving motor 103 at this time (in the normal state, the first driving motor 103 is in the stopped state, so that the welding arm 105 remains at the default height, and the distance between the welding head 135 and the electrode at this height can be applicable to most traditional models of battery cells). When welding non-standard battery cells, start the first driving motor 103. The output shaft of the first driving motor 103 drives the rotating shaft 107 to rotate. The rotating shaft 107 drives the spline collar 108 and the fixed collar 113 to rotate. The spline collar 108 and the fixed collar 113 drive the elastic strip 112 to rotate. The counterweight 110 on the elastic strip 112 will rotate. The rotation of the counterweight 110 will be affected by centrifugal force. The elastic strip 112 is pulled to deform outward by the centrifugal force, resulting in the reduction of the distance between the spline collar 108 and the fixed collar 113. At this time, the welding arm 105 will slide upward on the vertical sliding rod 104. At the same time, in addition to being affected by centrifugal force, the counterweight 110 will also be affected by air resistance under the action of the inclined plane 111, including the air resistance (the component of the resistance) in the same direction as the centrifugal force. 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 adjusting plate 134 to move, realizing the adjustment of the distance between the welding head 135 and the electrode (it is necessary to keep the rotational speed of the output shaft of the first driving motor 103 constant to ensure that the welding head 135 stays at a certain position, and the greater the rotational speed of the output shaft of the first driving motor 103, the greater the displacement of the welding head 135).

Claims

1. A combined welding device for a battery, characterized in that: It includes a support platform (119) capable of horizontal movement, on which a battery pack to be welded is placed. Above the support platform (119), there is a welding part, and the welding part includes two welding heads (135) arranged in parallel. The two welding heads (135) are 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 adjusting plates (134). Four downward pressure sliding rods (129) are fixedly mounted on each welding head adjusting plate (134). A downward pressure tension spring (132) and a holding tension spring (133) are wound around each downward pressure sliding rod (129). All the downward pressure sliding rods (129) are slidably mounted on a downward pressure support plate (128). The two ends of the holding tension spring (133) are fixedly engaged with the welding head adjusting plate (134) and the downward pressure support plate (128). One end of the downward pressure tension spring (132) is fixed to the downward pressure support plate (128), and an electromagnet (131) is fixed to the other end of the downward pressure tension spring (132). The electromagnet (131) is slidably sleeved on the downward pressure sliding rod (129), and a passive suction ring (130) is fixed to the end of the downward pressure sliding rod (129) away from the welding head adjusting plate (134). The passive suction ring (130) is magnetically engaged with the electromagnet (131). A slide rail (137) is provided on each welding head adjusting plate (134). 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 engaged with the welding head adjusting 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 realize the adjustment of the distance between the two welding heads (135). The downward pressure support plate (128) is fixedly mounted on an arch-shaped frame (127). The arch-shaped frame (127) is slidably mounted on a welding frame (106). An electric cylinder (125) is also fixedly mounted on the welding frame (106). The end of the telescopic rod of the electric cylinder (125) is movably connected to the arch-shaped frame (127) through a connecting rod (126). The middle 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 adjusting plates (134).

2. The combined welding device for a battery according to claim 1, characterized in that: The welding frame (106) is fixedly mounted on a welding arm (105). The welding arm (105) is slidably mounted on two vertically arranged parallel sliding rods (104). The two vertically arranged parallel sliding rods (104) are fixedly mounted on a 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). The welding arm (105) is slidably engaged with the rotating shaft (107).

3. The combined welding device for a battery according to claim 2, characterized in that: A protective cover (102) is also fixedly installed on the chassis (101). The protective cover (102) is sleeved outside the rotating shaft (107) and two vertical sliding rods (104). The top surface of the inner wall of the protective cover (102) is fixedly fitted with the tops of the two vertical sliding rods (104), and the top surface of the inner wall of the protective cover (102) is rotatably fitted with the top of the rotating shaft (107).

4. The combined welding device for a battery according to claim 3, wherein: A fixed collar (113) is fixedly installed at the top of the rotating shaft (107). A spline collar (108) is rotatably installed on the welding arm (105). The spline collar (108) is sleeved on the rotating shaft (107) in a spline sliding manner, and the spline collar (108) rotates circumferentially on the welding arm (105).

5. The combined welding device for a battery according to claim 4, 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 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).

6. The combined welding device for a battery according to claim 5, characterized in that: A bottom frame (114) is fixedly installed on the chassis (101). Two parallel horizontal sliding rods (115) are fixedly installed inside the bottom frame (114). Horizontal sliding sleeves (116) are slidably sleeved on the two horizontal sliding rods (115). Two parallel vertical sliding rods (117) are fixedly installed between the two horizontal sliding sleeves (116). A bottom sliding table plate (118) is slidably installed on the two vertical sliding rods (117).

7. The combined welding device for a battery according to claim 6, characterized in that: Four support platform guide rods (120) are fixedly installed on the lower surface of the support platform (119). The four support platform guide rods (120) are slidably fitted with the bottom sliding table plate (118). A threaded sleeve (121) is fixedly installed at the central position of the lower surface of the support platform (119). The threaded sleeve (121) is slidably fitted with the bottom sliding table plate (118). A lead screw (122) is threadedly driven and inserted into the axial position of the threaded sleeve (121). The lead screw (122) is fixedly installed on the output shaft of the second drive motor (123). The second drive motor (123) is fixedly installed on the lower surface of the bottom sliding table plate (118) overhead through the second drive motor bracket (124).

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