Spot welding machine for assembling lithium battery

Abstract

The utility model relates to the technical field of lithium battery production, in particular to a spot welding machine for assembling a lithium battery. Comprising a shell, a spot welding assembly is arranged in the shell, and the spot welding assembly comprises a servo electric cylinder fixedly installed on the upper side wall of the shell. According to the spot welding device, when the lifting assembly drives the movable plate to move vertically, the cylinders on the extending frames and the guide grooves in the movable plate move relatively, the inclined grooves in the guide grooves push the cylinders to move transversely, the distance between every two adjacent cylinders is adjusted at equal intervals, the cylinders drive the corresponding extending frames and the spot welding guns to move, and therefore the spot welding effect is achieved. The distance between every two adjacent spot welding guns is adjusted according to the distance between every two adjacent lithium battery cells, so that the spot welding machine is suitable for a lithium battery pack formed by arranging lithium batteries of different sizes together, when the vertical plate drives the multiple spot welding guns to move downwards, the multiple spot welding guns conduct spot welding on the multiple lithium batteries, and therefore the spot welding efficiency is improved. And the spot welding efficiency of the spot welding machine on the lithium battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production technology, and more specifically, to a spot welding machine for assembling lithium batteries. Background Technology

[0002] Lithium batteries generally use manganese dioxide as the positive electrode material, metallic lithium or its alloy metals as the negative electrode material, and a non-aqueous electrolyte solution. In daily life, lithium batteries are increasingly used in a wide range of fields. The connection technology between the positive and negative electrodes of lithium batteries is particularly critical, and spot welding is one of the most commonly used methods. Before spot welding, several lithium batteries are arranged and combined into a lithium battery pack 2. By placing the lithium battery pack 2 inside the spot welding machine, the spot welding machine can spot weld multiple lithium batteries at once, which significantly improves the spot welding efficiency of lithium batteries.

[0003] The utility model patent with authorization publication number CN222002173U provides a lithium battery spot welding device. Its technical solution includes a housing and a lithium battery. A T-shaped rod is slidably connected to the outside of the housing. A groove is formed on the outside of the T-shaped rod, and a rocker arm is slidably connected to the inside of the groove. A motor is fixedly connected to the outside of the housing, and the rocker arm is fixedly connected to the output end of the motor. An adjustment component is provided on the outside of the T-shaped rod, including a spot welding gun and a Z-shaped plate. A spring is fixedly connected to the outside of the housing, and a placement plate is fixedly connected to the end of the spring. An L-shaped connecting rod is symmetrically rotatably connected to the outside of the placement plate. By setting the adjustment component, the rotary knob is adjusted according to the size of the lithium battery to be spot welded. The arc groove drives the spot welding gun to spot weld the lithium battery. This device is applicable to lithium batteries of different sizes and solves the problem of difficulty in adjusting the spacing of the spot welding heads.

[0004] With the popularization of new energy vehicles and the rapid development of the energy storage market, the market demand for the energy density of lithium batteries is increasing. Since the energy density of a single lithium battery is limited, factories combine multiple lithium batteries to store more energy in a smaller volume, thereby improving the battery's energy density. The spot welding device provided in the aforementioned patent has only two spot welding guns on its receiving block, forming a group. The adjustment component can only adjust the distance between the two spot welding guns in that group. When spot welding a lithium battery pack 2 composed of multiple lithium batteries arranged together, if the number of single-row lithium batteries in the lithium battery pack 2 exceeds two, the spot welding device provided in the aforementioned patent needs to... Two or more receiving blocks are used in parallel, and two or more sets of spot welding guns are used in parallel to simultaneously spot weld several lithium batteries in the same row. However, when two or more sets of spot welding guns are used in parallel, if the spacing between the two spot welding guns in the same group is adjusted by adjusting the component, there will be a situation where the spacing between the two spot welding guns in the same group is different from the spacing between the spot welding guns in the two adjacent groups. This causes several sets of spot welding guns used in parallel to be unable to accurately spot weld several lithium batteries in the same row. Therefore, the spot welding device provided by the above patent needs to spot weld several lithium batteries in the same row multiple times, resulting in low spot welding efficiency of the device for lithium battery pack 2 composed of multiple lithium batteries arranged together. Utility Model Content

[0005] The purpose of this invention is to provide a spot welding machine for lithium battery assembly, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, one objective of this utility model is to provide a spot welding machine for lithium battery assembly, comprising a housing, inside which a spot welding assembly is provided. The spot welding assembly includes a servo cylinder fixedly mounted on the upper side wall of the housing. The lower end of the piston rod of the servo cylinder passes through the upper side wall of the housing and is fixedly connected to a vertical plate. Several extension frames are slidably arranged in a horizontal array on one side of the vertical plate. A spot welding gun is fixedly mounted on the lower end of each extension frame. A movable plate is provided on the side of the extension frame away from the vertical plate. A lifting assembly for driving the movable plate to move vertically is provided on the vertical plate. The moving plate has several guide grooves horizontally, the number of which is odd. The guide groove in the middle is a vertical groove, and the rest are inclined grooves. The inclined grooves are less inclined the farther away from the vertical groove. The inclined grooves are symmetrically distributed around the vertical groove as the central axis. A cylinder is fixedly installed on the side of the extension frame away from the vertical plate. The cylinders are slidably installed inside the guide grooves. The lithium battery pack is placed on the bottom surface inside the housing. The position of the row of lithium batteries at the edge of the lithium battery pack corresponds one-to-one with the position of the spot welding guns. A pushing mechanism is provided on the bottom surface inside the housing.

[0007] As a further improvement to this technical solution, the lifting assembly includes two lead screws that are vertically rotatably mounted on one side of the upright plate. A servo motor for driving the lead screw to rotate is fixed at the upper end of the lead screw. The servo motor is fixedly mounted on the upright plate by a mounting bracket. Nuts are fixedly connected to both sides of the movable plate, and the two nuts are threaded onto the two lead screws respectively.

[0008] As a further improvement to this technical solution, two horizontally arranged guide rails are fixedly installed on the side of the upright plate near the extension frame, and two sliders are fixedly connected on the side of the extension frame near the upright plate. The two sliders are slidably arranged inside the two guide rails respectively.

[0009] As a further improvement to this technical solution, the pushing mechanism includes an electric telescopic rod fixedly installed on the bottom surface inside the housing. One end of the piston rod of the electric telescopic rod is fixedly connected to a push plate, and the side of the push plate away from the electric telescopic rod contacts the side of the lithium battery pack away from the upright plate.

[0010] As a further improvement to this technical solution, movable grooves are provided near both ends of the push plate. A movable block is slidably arranged inside the movable groove. A clamping plate is fixedly connected to the end of the movable block away from the electric telescopic rod. The lower side wall of the clamping plate contacts the bottom surface inside the housing. The sides of the two clamping plates that are close to each other contact the opposite sides of the lithium battery pack. A threaded rod is rotatably arranged laterally on the side wall of the push plate. Two threaded grooves with opposite directions are opened on the threaded rod. The two movable blocks are threadedly connected to the two threaded grooves respectively.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This lithium battery assembly spot welding machine, when the lifting assembly drives the movable plate to move vertically, the cylinders on the extension frame and the guide grooves on the movable plate move relative to each other. The inclined grooves in the guide grooves push the cylinders to move laterally, so that the distance between two adjacent cylinders can be adjusted equally. The cylinders drive the corresponding extension frame and spot welding guns to move, thereby adjusting the distance between two adjacent spot welding guns according to the distance between two adjacent lithium battery cells. This makes the spot welding machine suitable for lithium battery packs composed of lithium batteries of different sizes arranged together. When the upright plate drives several spot welding guns to move downward, several spot welding guns spot weld several lithium batteries, improving the spot welding efficiency of the spot welding machine for lithium batteries. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0015] Figure 3This is a schematic diagram of the structure of the spot welding assembly of this utility model;

[0016] Figure 4 This is a partial structural schematic diagram of the spot welding assembly of this utility model;

[0017] Figure 5 This is a schematic diagram of the material pushing mechanism of this utility model;

[0018] Figure 6 This is a partial structural diagram of the feeding mechanism of this utility model.

[0019] The meanings of the labels in the diagram are as follows:

[0020] 1. Housing; 2. Lithium battery pack;

[0021] 3. Spot welding assembly; 31. Servo electric cylinder; 32. Vertical plate; 321. Guide rail; 33. Extension frame; 331. Cylinder; 332. Slider; 34. Movable plate; 341. Guide groove; 35. Lead screw; 36. Servo motor; 37. Spot welding gun;

[0022] 4. Pushing mechanism; 41. Electric telescopic rod; 42. Push plate; 421. Movable groove; 43. Moving block; 44. Clamping plate; 45. Threaded rod. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] Please see Figures 1-6As shown, one of the objectives of this embodiment is to provide a spot welding machine for assembling lithium batteries, including a housing 1. A lithium battery pack 2, composed of several rectangular arrays of lithium batteries, is placed on the bottom surface inside the housing 1. A spot welding assembly 3 is provided inside the housing 1. The spot welding assembly 3 includes a servo cylinder 31 fixedly mounted on the upper side wall of the housing 1. The lower end of the piston rod of the servo cylinder 31 passes through the upper side wall of the housing 1 and is fixedly connected to a vertical plate 32. The vertical plate 32 moves vertically when the piston rod of the servo cylinder 31 extends and retracts. At the same time, two slide rails are symmetrically fixed on both sides inside the housing 1. The slide rails are vertically arranged, and the two sides of the vertical plate 32 are respectively slidably arranged inside the two slide rails. To ensure stability during vertical movement, the upright plate 32 is restricted to vertical movement only. Several extension frames 33 are horizontally arranged and slidably mounted on one side of the upright plate 32. Two horizontally arranged guide rails 321 are fixed vertically on the side of the upright plate 32 near the extension frames 33. Two sliders 332 are fixedly connected to the side of the extension frames 33 near the upright plate 32. The two sliders 332 are slidably mounted inside the two guide rails 321. The guide rails 321 restrict the sliding path of the sliders 332, and the sliders 332 are tilting T-shaped blocks. The T-shaped sliders 332 and the guide rails 321 cooperate to restrict the separation of the extension frames 33 from the upright plate 32, ensuring that the extension frames 33 remain within the upright plate 32. A stable sliding mechanism is provided on one side. A spot welding gun 37 is fixedly installed at the lower end of the extension frame 33. The positions of a row of lithium batteries located at the edge of the lithium battery pack 2 correspond one-to-one with the positions of several spot welding guns 37. When the piston rod of the servo cylinder 31 extends, the piston rod of the servo cylinder 31 drives the upright plate 32, the extension frame 33 and the spot welding gun 37 to move vertically downward. When the gun head at the lower end of the spot welding gun 37 contacts the top of the corresponding lithium battery, the spot welding gun 37 performs spot welding on the lithium battery. At the same time, a pushing mechanism 4 is provided on the bottom surface inside the housing 1. The pushing mechanism 4 contacts the side of the lithium battery pack 2 away from the upright plate 32. The pushing mechanism 4 is used to push the lithium battery pack 2 to move laterally, so that the lithium battery... The side of the battery pack 2 that contacts the pusher mechanism 4 is close to the upright plate 32. After the spot welding gun 37 completes the spot welding of the lithium battery, the operator controls the piston rod of the servo cylinder 31 to retract, so that the piston rod of the servo cylinder 31 drives the upright plate 32, the extension frame 33 and the spot welding gun 37 to move vertically upward. Then the operator controls the pusher mechanism 4 to push the lithium battery pack 2 until the row of lithium batteries adjacent to the row of spot welded lithium batteries moves to the position corresponding to several spot welding guns 37 and stops. The above steps are repeated so that the spot welding gun 37 can spot weld several lithium batteries in the lithium battery pack 2. This spot welding machine can quickly spot weld several lithium batteries, improving the spot welding efficiency of lithium batteries.

[0026] The structure of the feeding mechanism 4 is described in detail below, with reference to... Figure 5 and Figure 6The feeding mechanism 4 includes an electric telescopic rod 41 fixedly installed on the bottom surface inside the housing 1. One end of the piston rod of the electric telescopic rod 41 is fixedly connected to a push plate 42. The side of the push plate 42 away from the electric telescopic rod 41 contacts the side of the lithium battery pack 2 away from the vertical plate 32. When the piston rod of the electric telescopic rod 41 extends, the piston rod of the electric telescopic rod 41 drives the push plate 42 to move laterally towards the vertical plate 32. The moving push plate 42 pushes the lithium battery pack 2 to move synchronously, thereby gradually pushing the multiple rows of lithium batteries in the lithium battery pack 2 to the position corresponding to the spot welding gun 37. At the same time, movable grooves 4 are opened on the push plate 42 near both ends. 21. A movable block 43 is slidably arranged inside the movable slot 421. A clamping plate 44 is fixedly connected to one end of the movable block 43 away from the electric telescopic rod 41. The lower side wall of the clamping plate 44 contacts the bottom surface inside the housing 1. The sides of the two clamping plates 44 that are close to each other contact the opposite sides of the lithium battery pack 2. The two clamping plates 44 restrict the relative movement between the lithium battery pack 2 and the push plate 42, ensuring that the push plate 42 can push several lithium batteries in the lithium battery pack 2 to the position corresponding to the spot welding gun 37, so that the spot welding gun 37 can accurately spot weld all the lithium batteries in the lithium battery pack 2, ensuring the spot welding quality of the lithium battery pack 2 by the spot welding machine.

[0027] Since the lithium battery pack 2 is assembled from multiple lithium batteries, the different sizes of the lithium batteries will result in different spacing between adjacent lithium battery cells in the lithium battery pack 2. If the spacing between adjacent spot welding guns 37 cannot be adjusted equidistantly according to the spacing between adjacent lithium battery cells in the lithium battery pack 2, the spot welding guns 37 will be unable to accurately spot weld the lithium battery cells, resulting in poor spot welding of the lithium batteries. To solve this problem, a movable... The movable plate 34 is provided with a lifting assembly on the upright plate 32 for vertically moving the movable plate 34. Several guide grooves 341 are horizontally formed on the movable plate 34. The number of guide grooves 341 is odd. The middle guide groove 341 is a vertical groove, and the remaining guide grooves 341 are inclined grooves. The inclination of the inclined grooves decreases as they are further away from the vertical groove. The inclined grooves are symmetrically distributed around the vertical groove as a central axis, and the spacing between the guide grooves 341 at the same height is the same. The spacing between the upper ends of the guide grooves 341 is greater than... The spacing between the lower ends of the guide grooves 341 is such that a cylinder 331 is fixedly installed on the side of the extension frame 33 away from the upright plate 32. Several cylinders 331 are slidably disposed inside several guide grooves 341. When the lifting assembly drives the movable plate 34 to move vertically, relative movement occurs between the guide grooves 341 and the corresponding cylinders 331. The cylinders 331 slide inside their respective guide grooves 341. Because the extension frame 33, cylinders 331, and slider 332 can only move laterally under the restriction of the guide rail 321, the cylinders... During the sliding process of 331 inside the corresponding guide groove 341, the inner wall of the inclined groove pushes the corresponding cylinder 331 to move laterally, so that the distance between two adjacent cylinders 331 can be adjusted equally. The moving cylinder 331 drives the corresponding extension frame 33 and spot welding gun 37 to move laterally, so that the distance between two adjacent spot welding guns 37 can be adjusted equally. The operator can adjust the distance between two adjacent spot welding guns 37 according to the distance between two adjacent lithium battery cells, so that the spot welding machine is suitable for lithium battery packs 2 composed of lithium batteries of different sizes arranged together.

[0028] The following details the structure of the lifting assembly, please refer to... Figure 3 The lifting assembly includes two lead screws 35, each vertically rotatably mounted on one side of the upright plate 32. A servo motor 36 is fixed to the upper end of each lead screw 35 to drive its rotation. The rotation direction of the output shaft of the servo motor 36 is adjustable. The servo motor 36 is fixedly mounted on the upright plate 32 via a mounting bracket. Nuts are fixedly connected to both sides of the movable plate 34. Two nuts are threadedly connected to the two lead screws 35. After the two servo motors 36 start synchronously, their output shafts drive the lead screws 35 to rotate. Through the threaded connection between the lead screws 35 and the nuts, the two nuts cause the movable plate 34 to move vertically. This allows the movable plate 34 to adjust the distance between two adjacent spot welding guns 37, making the spot welding machine suitable for lithium battery packs 2 of different sizes.

[0029] Meanwhile, a threaded rod 45 is laterally rotatably mounted on the side wall of the push plate 42. The threaded rod 45 has two threaded grooves in opposite directions. Two moving blocks 43 are threadedly connected to the two threaded grooves respectively. When the operator rotates the threaded rod 45, the two moving blocks 43 are positioned relative to each other through the threaded connection between the two moving blocks 43 and the two threaded grooves. The moving moving blocks 43 drive the corresponding clamping plates 44 to move synchronously, so that the operator can adjust the distance between the two clamping plates 44 according to the size of the lithium battery pack 2. The two clamping plates 44 can limit the lithium battery packs 2 of different sizes, ensuring that the push plate 42 can push several lithium batteries in the lithium battery pack 2 to the position corresponding to the spot welding gun 37, thus ensuring the spot welding quality of the lithium battery pack 2.

[0030] In use, the operator places the lithium battery pack 2, consisting of several lithium batteries arranged together, onto the bottom surface inside the housing 1, positioning the lithium battery pack 2 between two clamping plates 44, and ensuring that one side of the lithium battery pack 2 contacts the side of the push plate 42 closest to the upright plate 32. The operator then rotates the threaded rod 45 to bring the two clamping plates 44 closer together until both sides of the clamping plates 44 are in contact with the lithium battery pack 2. Simultaneously, the operator starts two servo motors 36, adjusting the distance between two adjacent spot welding guns 37 according to the distance between two adjacent lithium battery cells in the lithium battery pack 2, until the lithium... The row of lithium batteries furthest from the push plate 42 on battery pack 2 corresponds one-to-one with the positions of several spot welding guns 37. Then, the piston rod of the electric telescopic rod 41 extends and drives the spot welding guns 37 to move downward. The spot welding guns 37 at the lowest position spot weld the lithium batteries. After the spot welding guns 37 finish spot welding the lithium batteries, the piston rod of the servo cylinder 31 retracts and drives the spot welding guns 37 to move upward. Then, the push plate 42 pushes the lithium battery pack 2 until the next row of lithium batteries moves to the position corresponding to the several spot welding guns 37. The above steps are repeated so that the spot welding guns 37 spot weld several lithium batteries in the lithium battery pack 2.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A spot welder for assembling lithium batteries comprising a housing (1), characterized in that: The inside of the shell (1) is provided with a spot welding assembly (3), the spot welding assembly (3) includes a servo cylinder (31) fixedly installed on the upper side wall of the shell (1), the lower end of the piston rod of the servo cylinder (31) penetrates through the upper side wall of the shell (1) and is fixedly connected with a vertical plate (32), a plurality of extension frames (33) are transversely arranged on one side of the vertical plate (32), the lower end of the extension frame (33) is fixedly provided with a spot welding gun (37), and the side of the extension frame (33) away from the vertical plate (32) is provided with a movable plate (34), the vertical plate (32) is provided with a lifting assembly for driving the movable plate (34) to move vertically, a plurality of guide grooves (341) are transversely formed in the movable plate (34), the number of the guide grooves (341) is odd, the guide groove (341) located in the middle is a vertical groove, the remaining guide grooves (341) are inclined grooves, the inclination of the inclined groove farther away from the vertical groove is smaller, and the plurality of inclined grooves are symmetrically distributed about the vertical groove as the central axis, a plurality of cylinders (331) are fixedly arranged on the side of the extension frame (33) away from the vertical plate (32), a plurality of the cylinders (331) are respectively slidably arranged in the plurality of guide grooves (341), the lithium battery pack (2) is placed on the bottom surface in the inside of the shell (1), and the positions of a row of lithium batteries located at the edge in the lithium battery pack (2) correspond one-to-one to the positions of the plurality of spot welding guns (37), and a material pushing mechanism (4) is arranged on the bottom surface in the inside of the shell (1).

2. The spot welder for assembling lithium batteries according to claim 1, characterized in that: The lifting assembly includes two lead screws (35) vertically rotatably arranged on one side of the vertical plate (32), the upper end of the lead screw (35) is fixedly connected with a servo motor (36) for driving the lead screw (35) to rotate, the servo motor (36) is fixedly installed on the vertical plate (32) through a mounting frame, and the two sides of the movable plate (34) are fixedly connected with nuts, and the two nuts are respectively threadedly connected to the two lead screws (35).

3. The spot welder for assembling lithium batteries according to claim 1, characterized in that: The vertical plate (32) is fixedly provided with two transversely arranged guide rails (321) on the side close to the extension frame (33), the extension frame (33) is fixedly connected with two sliding blocks (332) on the side close to the vertical plate (32), and the two sliding blocks (332) are slidably arranged in the two guide rails (321).

4. The spot welder for assembling lithium batteries according to claim 1, characterized in that: The material pushing mechanism (4) includes an electric telescopic rod (41) fixedly installed on the bottom surface in the inside of the shell (1), one end of the piston rod of the electric telescopic rod (41) is fixedly connected with a push plate (42), and the side of the push plate (42) away from the electric telescopic rod (41) is in contact with the side of the lithium battery pack (2) away from the vertical plate (32).

5. The spot welder for assembling lithium batteries according to claim 4, characterized in that: The movable slot (421) is slidably provided with a moving block (43) inside, one end of the moving block (43) away from the electric telescopic rod (41) is fixedly connected with a clamping plate (44), the lower side wall of the clamping plate (44) is in contact with the bottom surface inside the shell (1), the sides of the two clamping plates (44) close to each other are respectively in contact with the opposite sides of the lithium battery pack (2), the side wall of the push plate (42) is horizontally rotatably provided with a threaded rod (45), two threaded grooves with opposite directions are formed in the threaded rod (45), and the two moving blocks (43) are respectively screwed on the two threaded grooves.

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