Battery cell pre-welding production line based on magnetic suspension conveying

Abstract

The invention discloses a battery cell pre-welding production line based on magnetic suspension conveying, and relates to the technical field of battery cell processing, and the battery cell pre-welding production line comprises a rack, a magnetic suspension conveying line, a feeding device, a welding device and a discharging device; a feeding station, a welding station and a discharging station are formed on the machine frame. The magnetic suspension conveying line is arranged on the rack, the conveying path of the magnetic suspension conveying line sequentially passes through the feeding station, the welding station and the discharging station, and the magnetic suspension conveying line is used for conveying battery cells; the feeding device is arranged on the feeding station and is used for conveying battery cells to the magnetic suspension conveying line; the welding device is arranged at the welding station and is used for welding tabs on the battery cells; the discharging device is arranged on the discharging station and used for discharging the battery cells on the magnetic suspension conveying line. And through more reasonable process design, the production takt is improved, and the occupied space of equipment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of battery core processing, and in particular to a battery core pre-welding production line based on magnetic levitation transportation. Background Art

[0002] During the processing of square batteries, the tabs on the battery cells need to be pre-welded. For rectangular battery cells with tabs located at opposite ends of the battery cells, traditional tab pre-welding equipment is not suitable, otherwise there will be problems with inaccurate pre-welding, and corresponding design is required for its structure; in addition, the stepping conveyor method or belt chain conveyor method has a too complex and bloated structure, occupies a large space on the equipment table, and cannot meet the requirements of higher production efficiency. Summary of the invention

[0003] The main purpose of the present invention is to propose a battery pre-welding production line based on magnetic suspension conveying, aiming to

[0004] To achieve the above object, the present invention proposes a cell pre-welding production line based on magnetic levitation transportation, the cell pre-welding production line comprising:

[0005] The frame is formed with a loading station, a welding station and an unloading station;

[0006] A magnetic levitation transport line is arranged on the frame, the transport path of the magnetic levitation transport line passes through the loading station, the welding station and the unloading station in sequence, and the magnetic levitation transport line is used to transport the battery core;

[0007] A feeding device, arranged at the feeding station, for conveying the battery cells to the magnetic suspension transport line;

[0008] A welding device, disposed at the welding station, for welding the tabs on the battery core; and

[0009] The unloading device is arranged at the unloading station and is used to unload the battery cells on the magnetic suspension transport line.

[0010] In one embodiment, the welding device comprises:

[0011] An ultrasonic welding machine, arranged corresponding to the welding station, for respectively welding the positive and negative electrodes of the battery cell tabs; and

[0012] A welding fixture is used to transfer the battery core between the magnetic levitation transport line and the ultrasonic welding machine.

[0013] In one embodiment, the welding stations are provided in plurality, the plurality of welding stations include a positive electrode welding station and a negative electrode welding station, and the corresponding welding devices are provided in plurality, the plurality of welding devices include:

[0014] A positive electrode ultrasonic welding machine is provided corresponding to the positive electrode welding station and is used to weld the positive electrode tab of the battery cell; and

[0015] A negative electrode ultrasonic welding machine is provided corresponding to the negative electrode welding station and is used for welding the negative electrode tab of the battery cell.

[0016] In one embodiment, the welding device comprises:

[0017] The frame is also provided with a cutting station between the welding station and the blanking station;

[0018] The battery pre-welding production line also includes:

[0019] The tab cutting mechanism is arranged at the cutting station, and is used for cutting the positive and negative tabs of the battery cell.

[0020] In one embodiment, the magnetic levitation transport line comprises:

[0021] The frame is also provided with a sweeping station between the cutting station and the blanking station;

[0022] The battery pre-welding production line also includes:

[0023] The leveling mechanism is arranged at the leveling station, and the leveling mechanism includes a plurality of groups of first pressing plates and second pressing plates arranged opposite to each other, and at least one of the pressing plates is movably arranged to flatten the battery cell tabs when approaching another pressing plate.

[0024] In one embodiment, a cleaning station is formed on the frame and is located between the sweeping station and the unloading station.

[0025] The battery cell pre-welding production line also includes:

[0026] A cleaning mechanism is arranged at the cleaning station, and is used for cleaning the cleaned battery cells.

[0027] In one embodiment, the frame is further formed with an inspection station and an NG classification station which are sequentially arranged between the welding station and the unloading station;

[0028] The battery cell pre-welding production line also includes:

[0029] A visual inspection component, including a visual camera, which is movably arranged at the inspection station to inspect the welding effect of the tabs and identify unqualified cells;

[0030] The NG classification mechanism is arranged at the NG classification station and comprises a first picking-up part, wherein the first picking-up part is used to transfer unqualified battery cells on the magnetic levitation transport line.

[0031] In one embodiment, the frame is further provided with a buffer station and a material replenishing station which are sequentially arranged between the detection station and the unloading station;

[0032] The battery cell pre-welding production line also includes:

[0033] A cache mechanism, arranged corresponding to the cache station, for pre-storing qualified battery cells;

[0034] The feeding mechanism is arranged corresponding to the feeding station, and includes a second picking part, and the second picking part is used to pick up the qualified battery cells and correspondingly replenish the battery cells transported by the NG classification mechanism.

[0035] In one embodiment, the frame is further provided with a turning station between the welding station and the unloading station.

[0036] The battery cell pre-welding production line further includes a turning device, which includes:

[0037] A flip base, arranged corresponding to the flip station;

[0038] A first slide, disposed on the flip base and extending along a first direction;

[0039] a second slide, movably mounted on the first slide and extending along a second direction, wherein the extension direction of the second slide intersects with the extension direction of the first slide;

[0040] A rotating mechanism, one end of which is rotatably mounted on the second slide, and the other end of which is rotatably mounted with 2N flip fixtures;

[0041] Sensor, used to identify the positive and negative poles of the battery cell to be flipped;

[0042] Wherein, the flipping fixture is used to flip every two of the battery cells so that the positive and negative poles are arranged opposite to each other.

[0043] In one embodiment, the frame is further provided with a short circuit detection station between the loading station and the welding station;

[0044] The battery cell pre-welding production line also includes:

[0045] A short circuit testing mechanism is arranged corresponding to the short circuit detection station, and comprises a testing probe, wherein the testing probe is movably arranged in the short circuit testing mechanism to contact the battery cell.

[0046] In the technical solution of the present invention, the loading device, the welding device and the unloading device are arranged in sequence along the magnetic levitation transport line. The magnetic levitation transport line can connect multiple devices in series as one. Multiple devices successively perform battery cell loading, battery cell welding and battery cell unloading to realize the automated, intelligent and efficient operation of the battery cell pre-welding production line. The table space is reduced and the production rhythm is improved through the annular layout of the mechanism line and a more reasonable process design. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0048] Figure 1 A structural schematic diagram of an embodiment of a battery cell pre-welding production line based on magnetic levitation transportation provided by the present invention;

[0049] Figure 2 for Figure 1 Schematic diagram of the structure of the magnetic levitation conveyor line;

[0050] Figure 3 for Figure 1 Structural schematic diagram of the middle feeding device;

[0051] Figure 4 for Figure 1 The structural diagram of the weighing mechanism;

[0052] Figure 5 for Figure 1 Schematic diagram of the structure of the medium thickness measuring mechanism;

[0053] Figure 6 for Figure 1 Structural diagram of the medium short circuit detection mechanism;

[0054] Figure 7 for Figure 1 The structural diagram of the welding device;

[0055] Figure 8 for Figure 1 A schematic diagram of the structure of the middle tab cutting mechanism;

[0056] Fig. 9 for Figure 1 Structural diagram of the middle sweeper mechanism;

[0057] Fig.10 for Figure 1 Schematic diagram of the structure of the visual detection component;

[0058] Fig.11 for Figure 1 A schematic diagram of the structure of the cache mechanism;

[0059] Fig.12 for Figure 1 A schematic diagram of the structure of the middle flip device;

[0060] Fig.13 for Figure 1 Schematic diagram of the structure of the middle feeding device.

[0061] Description of Figure Numbers:

[0062] 1000. Cell pre-welding production line based on magnetic levitation conveying; 01. Rack; 02. Magnetic levitation conveying line; 021. Guide rail; 022. Cell fixture; 03. Loading device; 031. Loading base; 032. First mechanical arm; 033. Loading fixture; 04. Unloading device; 041. Unloading base; 042. First slide rail; 043. Second mechanical arm; 044. Unloading fixture; 05. Welding device; 051. Ultrasonic welding machine; 0511. Casing; 0512. Welding platform; 0513. Welding head; 0514. Driving device; 0515. Positive ultrasonic welding machine; 0516. Negative ultrasonic welding machine; 06. Weighing mechanism; 061. Weighing base; 062. Weighing fixture; 063. Weighing device; 0 7. Thickness measuring mechanism; 071. Thickness measuring base; 072. Thickness measuring fixture; 073. Pressing plate; 08. Visual inspection component; 081. Visual camera; 09. Cache mechanism; 10. NG classification mechanism; 11. Short-circuit test mechanism; 111. Test probe; 112. Abutment portion; 113. Short-circuit drive device; 12. Flipping device; 121. Flipping base; 122. First slide; 123. Second slide; 124. Rotating mechanism; 125. Flipping fixture; 126. Sensor; 13. Tab cutting mechanism; 131. Pressing cutting plate; 132. Pressing cutting plate; 133. Cutting drive mechanism; 14. Sweeping mechanism; 141. First pressing plate; 142. Second pressing plate; 143. Sweeping drive motor; 15. Cleaning mechanism.

[0063] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0066] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0067] For rectangular cells with tabs located at opposite ends of the cell, traditional tab pre-welding equipment is not suitable, otherwise there will be problems with inaccurate pre-welding, and corresponding design is required for its structure; in addition, the stepping conveyor or belt chain conveyor structure is too complex and bloated, the equipment table space is large, and it cannot meet the requirements of higher production efficiency.

[0068] To this end, the present invention proposes a battery cell pre-welding production line 1000 based on magnetic levitation transportation, aiming to improve the production cycle and reduce the space occupied by equipment through a more reasonable process design.

[0069] See also Figure 1 In one embodiment of the present invention, the battery cell pre-welding production line includes a frame 01, a magnetic levitation transport line, a loading device 03, a welding device 05 and a unloading device 04; the frame 01 is formed with a loading station, a welding station and an unloading station; the magnetic levitation transport line is arranged on the frame 01, and the conveying path of the magnetic levitation transport line passes through the loading station, the welding station and the unloading station in sequence, and the magnetic levitation transport line is used to convey battery cells; the loading device 03 is arranged at the loading station to convey battery cells to the magnetic levitation transport line; the welding device 05 is arranged at the welding station to weld the pole ear on the battery cell; the unloading device 04 is arranged at the unloading station to unload the battery cells on the magnetic levitation transport line.

[0070] In the technical solution of the present invention, the loading device 03, the welding device 05 and the unloading device 04 are arranged in sequence along the magnetic levitation transport line. The magnetic levitation conveyor line 02 can connect multiple devices in series. Multiple devices successively perform battery cell loading, battery cell welding and battery cell unloading to realize the automated, intelligent and efficient operation of the battery cell pre-welding production line. Through the annular layout of the mechanism line and a more reasonable process design, the table space is reduced and the production rhythm is improved.

[0071] See also Figure 2 In one embodiment of the present invention, the magnetic levitation transport line includes a guide rail 021 and at least one battery cell fixture 022. The guide rail 021 is provided on the frame 01. The extension path of the guide rail 021 passes through the loading station, the welding station and the unloading station in sequence. A magnetic levitation stator is provided on the guide rail 021; the at least one battery cell fixture 022 is provided with a magnetic levitation mover, and the magnetic levitation mover is magnetically suspended and connected to the magnetic levitation stator, so that the battery cell fixture 022 is magnetically suspended and installed on the guide rail 021, and the battery cell fixture 022 is used to carry the battery cell. It can be understood that in one embodiment of the present application, only one magnetic levitation transport line is provided, and the magnetic levitation transport line passes through the loading station, the welding station and the unloading station to transport semi-finished battery cells. In another embodiment of the present application, two magnetic levitation transport lines are provided, the two magnetic levitation transport lines are arranged at an interval, and the two magnetic levitation transport lines can realize cross-transportation with each other to avoid the entire line from being shut down when one of the magnetic levitation transport lines or the production equipment fails. Among them, when the loading device 03 loads the battery cell onto the magnetic levitation conveyor line 02, the battery cell clamp 022 clamps the battery cell and passes through the loading station, the welding station and the unloading station in sequence, and a magnetic levitation stator is fixedly set on the guide rail 021, and a magnetic levitation mover is set under the battery cell clamp 022. The magnetic force between the magnetic levitation stator and the magnetic levitation mover repulses each other, so that the battery cell clamp 022 is suspended on the guide rail 021, and power is generated by the magnetic field to push the battery cell carrier to move along the guide rail 021, thereby avoiding physical contact between the traditional conveyor belt and the battery cell, reducing friction and wear, and enhancing durability. In order to enhance the accuracy of the battery cell displacement, the magnetic levitation transport line can also be connected to a control system for accurately controlling the position and speed of the battery cell clamp 022 to ensure accurate transmission of the battery cell on the production line.

[0072] Specifically, the battery cell fixture 022 includes a fixture base and a limiting assembly; it is understandable that a plurality of battery cell fixtures 022 are provided on the magnetic levitation transport line, and the plurality of battery cell fixtures 022 can be arranged in sequence and at intervals on the magnetic levitation transport line, so that the welding device 05 can clamp and process each battery cell respectively; in another embodiment of the present invention, in order to improve the production rhythm, some devices will process multiple battery cells at the same time, and for this purpose, the multiple battery cells can be divided into multiple groups, the battery cells in each group of battery cells are connected in sequence, and the battery cells in each group are arranged at intervals, so as to facilitate the processing of multiple battery cells at the same time; in addition, the limiting assembly is arranged on the fixture base, and a magnetic levitation mover is arranged under the fixture base, and the limiting assembly includes A first limiting portion and a second limiting portion are arranged horizontally opposite to each other, wherein at least the second limiting portion is movably arranged in a direction approaching or away from the first limiting portion, so as to limit the battery cell together with the first limiting portion; it is understandable that only one of the first limiting portion and the second limiting portion can be moved, or the first limiting portion and the second limiting portion can move toward each other to clamp the battery cell together; specifically, a square groove can be adaptively formed on the clamp base to accommodate the battery cell and further prevent the battery cell from shaking; it is understandable that due to the shape of the processed battery cell being uncertain, the groove can also be set to other shapes, as long as it is compatible with the battery cell shell, and the present invention is not limited here.

[0073] In order to better load the battery cells, please refer to Figure 3 In one embodiment of the present invention, the loading device 03 includes a loading base 031 and a first robotic arm 032; the loading base 031 is arranged at the loading station; one end of the first robotic arm 032 is rotatably mounted on the loading base 031, and the other end is provided with at least one loading fixture 033 for clamping the battery cell and transporting it to the magnetic levitation transport line; when the battery cell of the previous process is transported, the first robotic arm 032 rotates in the horizontal direction to move the loading fixture 033 to the battery cell Above, after the loading fixture 033 clamps the battery cell, the first robotic arm 032 turns back to the top of the magnetic levitation conveyor line 02, and makes the loading fixture 033 correspond to the battery cell fixture 022. When the battery cell fixture 022 also clamps the battery cell, the loading fixture 033 releases the clamping to complete the battery cell loading. In order to better adjust the loading position of the battery cell and better correspond to the magnetic levitation conveyor line, the loading fixture 033 and the first robotic arm 032 can also be set to be rotatably connected.

[0074] Specifically, the loading clamp 033 includes two relatively arranged loading battery cell jaws, and a loading clamp driving assembly that drives the two loading battery cell jaws to move closer to or away from each other. The loading clamp driving assembly can be a cylinder or a screw structure, and the present invention does not impose any restrictions on this, as long as it can drive the loading battery cell jaws to move in a straight line; in this embodiment, each of the loading battery cell jaws includes at least one clamping arm, and the clamping arm is formed with a convex portion facing the other relatively arranged loading battery cell jaw at the free end away from the first mechanical arm 032, the clamping arm is used to clamp the side wall of the battery cell, and the convex portion is used to support the bottom of the battery cell to prevent the battery cell from falling during the clamping process, thereby increasing the reliability of clamping; it can be understood that the more clamping arms there are, the more stable the clamping effect on the battery cell, and the specific number can be set according to actual needs. The present invention does not impose any restrictions on the specific number of the clamping arms.

[0075] It is understandable that there will inevitably be unqualified cells among the cells being fed, which are not suitable for welding. It is necessary to pre-inspect the cells being fed to avoid damage to the equipment. For this purpose, please refer to Figure 4 In one embodiment of the present invention, a weighing station is formed on the frame 01 between the loading station and the welding station, and the cell pre-welding production line further comprises a weighing mechanism 06, the weighing mechanism 06 comprises a weighing base 061, a weighing device 063 and a weighing fixture 062, the weighing base 061 is arranged at the weighing station; the weighing device 063 is arranged at the weighing base 061 to measure the weight of the cell; the weighing fixture 062 is movably mounted to the weighing base 06 1, used to transfer the battery cell between the magnetic suspension transport line and the weighing device 063; when the battery cell is transported to the weighing station by the magnetic suspension conveying line 02, the weighing fixture 062 clamps the battery cell to the weighing device 063, and the weighing device 063 weighs the battery cell and detects whether the weight meets the preset value range. When the weight of the battery cell is within the preset value range, the weighing fixture 062 clamps the battery cell and puts it back on the magnetic suspension conveying line 02. The weighing device 063 can be an electronic scale or a balance, and the present invention does not limit this, as long as it can weigh the battery cell;

[0076] Specifically, the weighing clamp 062 can be an electromagnet or a negative pressure device for selectively sucking or releasing the battery cell, or it can be the first manipulator. The present invention does not limit this, as long as it can clamp the battery cell to complete the transfer between the magnetic levitation transport line and the weighing station.

[0077] In addition, in order to better test the battery, please refer to Figure 5In one embodiment of the present invention, a thickness measuring station located between the loading station and the welding station is further formed on the frame 01, and the cell pre-welding production line further includes a thickness measuring mechanism 07, the thickness measuring mechanism 07 includes a thickness measuring base 071, a thickness measuring device and a thickness measuring transfer fixture, the thickness measuring base 071 is arranged at the thickness measuring station, the thickness measuring device is arranged at the thickness measuring base 071, and is used to measure the thickness of the cell, including a thickness measuring fixture 072, the thickness measuring fixture 072 includes at least one group of two pressing plates 073 arranged opposite to each other, at least one pressing plate 073 in each group is movably arranged, and is used to press the cell in the process of approaching the other pressing plate 073; the thickness measuring transfer fixture is movably installed on the thickness measuring base 071, and is used to transfer the cell between the magnetic levitation transport line and the thickness measuring device. When the battery cell is transported to the thickness measuring station by the magnetic suspension conveyor line 02, the thickness measuring transfer fixture clamps the battery cell onto the thickness measuring fixture 072, and at least one of the two pressing plates 073 presses the battery cell in the process of approaching the other pressing plate 073. The thickness measuring device also includes a rangefinder and a pressure sensor. The rangefinder is used to measure the distance between the two pressing plates 073, so as to obtain the thickness of the battery cell and determine whether the thickness meets the preset value range. The thickness measuring transfer fixture transfers the qualified battery cell back to the magnetic suspension conveyor line 02. Feed line 02; the pressure sensor is arranged on one side of a pressure plate 073 facing the other pressure plate 073. When the pressure of the pressure sensor exceeds a threshold value during the process of the two pressure plates 073 approaching each other, it indicates that the two pressure plates 073 have pressed the battery cells tightly. At this time, distance measurement can be performed. By setting the pressure sensor, damage to the battery cells can be avoided and the yield rate can be improved. It can be understood that the two pressure plates 073 can move towards each other, or one of the pressure plates 073 can remain stationary while the other pressure plate 073 approaches. The present invention does not impose any limitation on this.

[0078] Specifically, the thickness measuring fixture 072 can be an electromagnet or a negative pressure device for selectively sucking or releasing the battery cell, or it can be the first manipulator. The present invention does not impose any limitation on this, as long as it can clamp the battery cell to complete the transfer between the magnetic levitation transport line and the thickness measuring station.

[0079] See also Figure 6In one embodiment of the present invention, a short-circuit detection station is formed on the frame between the loading station and the welding station; the battery cell pre-welding production line also includes a short-circuit test mechanism 11, which is arranged corresponding to the short-circuit detection station, and includes a test probe 111, and the test probe 111 is movably arranged on the short-circuit test mechanism 11 to contact the battery cell. Specifically, the short-circuit test mechanism 11 also includes an abutment portion 112 and a short-circuit driving device 113, and the abutment portion 112 is sharp at one end close to the battery cell, so as to press the battery cell during the short-circuit test, and does not affect the resistance of the battery cell, thereby avoiding affecting the test results and improving the test accuracy; it can be understood that the abutment portion 112 can also be arranged in a plane at one end close to the battery cell, so as to more reliably press the battery cell. After the battery cell is transported to the short-circuit detection station by the magnetic levitation conveyor line 02, the test probe 111 contacts the battery cell and is powered on to test whether the battery cell is short-circuited, further ensuring whether the battery cell meets the pre-welding requirements; it can be understood that the test probe 111 can also be integrated on the thickness measuring base 071 or the weighing base 061, so as to measure whether the battery cell is short-circuited when measuring the thickness or weighing the battery cell, thereby reducing the process, improving the production cycle and reducing the space of the battery cell pre-welding production line.

[0080] It is important to understand that ultrasonic welding is a welding technology that uses high-frequency vibration energy to generate frictional heat on the contact surface, thereby melting the material and forming a strong connection. Ultrasonic welding can be completed in a few milliseconds, greatly improving production efficiency, which is very important for mass-produced batteries. In addition, ultrasonic welding does not require additional solder or flux, reducing costs and simplifying the welding process, which also reduces environmental pollution and waste disposal costs.

[0081] See also Figure 7 In one embodiment of the present invention, the welding device 05 includes a welding base 051, an ultrasonic welding machine 052 and a welding fixture: the welding base 051 is arranged corresponding to the welding station; the ultrasonic welding machine 052 is arranged on the welding base 051, and is used to weld the positive and negative poles of the battery cell tabs respectively; the welding fixture is movably installed on the welding base 051, and is used to transport the battery cell between the magnetic levitation conveyor line and the ultrasonic welding machine 052. When the battery cell is transported to the welding station, the welding fixture transports the battery cell from the magnetic levitation conveyor line 02 to the welding station, and the ultrasonic welding machine 052 pre-welds the four positions of the positive and negative tabs of the battery cell in turn, thereby ensuring that the tabs will not be lifted and improving the welding quality.

[0082] Specifically, in one embodiment of the present invention, the ultrasonic welding machine 051 includes a housing 0511, a welding platform 0512, a welding head 0513 and a driving device 0514; an ultrasonic energy generating unit is provided inside the housing, the welding platform 0512 is used to accommodate the battery cell, the welding head 0513 is located outside the housing and connected to the ultrasonic energy generating unit, and the driving device 0514 is used to drive the welding head 0513 to approach the welding station; the ultrasonic energy generating unit generates a high-frequency alternating current signal and converts the electrical signal generated by the ultrasonic generator into mechanical vibration, the welding head 0513 is connected to the ultrasonic energy generating unit, thereby transmitting ultrasonic vibration, when the battery cell is transported from the magnetic levitation conveyor line 02 to the welding platform 0512, the driving device 0514 drives the welding head 0513 to approach the battery cell, and transmits the ultrasonic vibration to the battery cell, and welds the four positions of the positive and negative ears of the battery cell. In addition, it is understandable that during the welding process, the battery cell is prone to shaking. For this reason, the welding platform 0512 is formed with a groove, and the groove is adapted to the battery cell to accommodate the battery cell and prevent it from moving in the horizontal plane and affecting the welding effect.

[0083] In one embodiment of the present invention, the welding stations are provided in plurality, including a positive electrode welding station and a negative electrode welding station, and the corresponding welding devices 05 are provided in plurality, including a positive electrode ultrasonic welding machine 0515 and a negative electrode ultrasonic welding machine 0516. The positive electrode ultrasonic welding machine 0515 is provided corresponding to the positive electrode welding station to weld the positive electrode tab of the battery cell; the negative electrode ultrasonic welding machine 0516 is provided corresponding to the negative electrode welding station to weld the negative electrode tab of the battery cell. When the battery cell is transported to the welding station, it is necessary to pre-weld the four positions of the battery cell tabs in turn, and it can be understood that the positive and negative tabs of the battery cell are made of different materials, and the required welding processes are also different. For this reason, the welding device 05 includes a positive ultrasonic welding machine 0515 and a negative ultrasonic welding machine 0516, which are used to weld the positive and negative tabs of the battery cell respectively; in another embodiment of the present invention, since welding takes the longest time, in order to improve the production cycle, a plurality of positive ultrasonic welding machines 0515 and negative ultrasonic welding machines 0516 can be set up, and arranged in turn along the magnetic levitation conveyor line 02, and the plurality of positive ultrasonic welding machines 0515 can be driven by the same driving device 0514 to weld a plurality of battery cells at the same time; accordingly, the plurality of negative ultrasonic welding machines 0516 can also be driven by the same driving device 0514 to weld a plurality of battery cells at the same time, to ensure the consistency of welding quality and improve welding efficiency.

[0084] Since the battery cell tabs are of different lengths, in order to ensure that the tab sizes of all battery cells are consistent and facilitate subsequent assembly, please refer to Figure 8 In one embodiment of the present invention, a cutting station is formed on the frame 01 between the welding station and the unloading station, and the battery cell pre-welding production line also includes a tab cutting mechanism 13, which is arranged at the cutting station. When the battery cell is transported to the cutting station, the cutting mechanism cuts the excess part of the battery cell tab. Specifically, the cutting mechanism includes a downward pressing cutting plate 131, an upper cutting plate 132 and a cutting drive mechanism 133. The downward pressing cutting mechanism and the upper cutting mechanism are arranged at intervals in the horizontal direction, and at least a portion of the battery cell pole ear is placed in the interval. The cutting drive mechanism 133 drives the downward pressing cutting plate 131 and the upper cutting plate 132 to approach each other in the vertical direction, thereby cutting the battery cell pole ear; it should be noted that the cutting drive mechanism 133 can be driven by a cylinder or a motor, and the present invention does not impose any restrictions on this, as long as it can drive the downward pressing cutting plate 131 and the upper cutting plate 132 to move in a straight line.

[0085] It is understandable that when the battery cell tabs are welded, they will deform. Fig. 9 In one embodiment of the present invention, a leveling station is formed on the frame 01 between the welding station and the unloading station, and the battery cell pre-welding production line also includes a leveling mechanism 14, which is arranged at the leveling station, including a plurality of groups of first pressing plates 141 and second pressing plates 142 arranged opposite to each other, and a leveling drive motor 143 for driving the first pressing plates 141 and the second pressing plates 142, at least one of the pressing plates is movably arranged to flatten the battery cell tabs when approaching another pressing plate, thereby reducing the risk of short circuit caused by sharp edges or protrusions, improving the safety of the battery cell, and ensuring good electrical contact between the tabs and the connecting components, thereby improving the efficiency and reliability of current transmission.

[0086] Furthermore, after the battery cell tabs are welded and cut, there will be residual debris and other impurities, which will affect the connection quality of the tabs. For this reason, in one embodiment of the present invention, a cleaning station is formed on the frame 01 between the cutting station and the unloading station, and the battery cell pre-welding production line also includes a cleaning mechanism 15, which is arranged at the cleaning station to clean the battery cells after being leveled; specifically, the cleaning mechanism 15 includes a brush and a driving mechanism, the brush is arranged corresponding to the cleaning station, and the driving mechanism is used to drive the brush to reciprocate horizontally above the battery cell tabs, thereby removing impurities on the battery cell tabs. In another embodiment of the present invention, the cleaning structure may also include a fan, which is arranged corresponding to the cleaning station to blow away the impurities.

[0087] See also Fig.10 In one embodiment of the present invention, the frame is further formed with an inspection station and an NG classification station which are sequentially arranged between the welding station and the unloading station; the battery cell pre-welding production line also includes a visual inspection mechanism and an NG classification mechanism 10, the visual inspection component includes a visual camera, the visual camera is movably arranged at the inspection station, for inspecting the welding effect of the tab and identifying unqualified battery cells; the NG classification mechanism 10 is movably arranged between the inspection station and the cache station, and includes a first picking portion, the first picking portion is used to transfer unqualified battery cells on the magnetic levitation transport line.

[0088] After the welding of the battery cell is completed, the welding quality of the battery cell needs to be inspected. In order to more comprehensively inspect the welding quality, the present invention provides a visual inspection component 08, and the visual inspection component 08 includes a visual camera 081, and the visual camera 081 is a 2D camera. By collecting the plane image of the battery cell welding point, the dot track of the battery cell welding area and whether there is a missing weld or a weld through are identified. In addition, it can be understood that in another embodiment of the present invention, in order to facilitate the subsequent assembly of the battery cell, the battery cell tabs will be cut, so the 2D camera will also detect the size of the tabs; in another embodiment of the present invention, the visual camera 081 can also be a 3D camera, so as to collect the plane image and three-dimensional image of the battery cell welding point to comprehensively evaluate the battery cell welding quality.

[0089] When the visual inspection component 08 identifies unqualified battery cells, the first picking part 101 picks up the corresponding battery cells and transfers them to a special NG transport line according to the reasons for the unqualified battery cells, so as to reprocess the unqualified battery cells and reduce waste. It should be noted that the first picking part 101 has many structural forms, such as a clamping claw or a negative pressure nozzle, and the present invention is not limited to this, as long as it can stably pick up the battery cells.

[0090] See also Fig.11 In one embodiment of the present invention, a cache station and a replenishing station are formed on the frame and are arranged in sequence between the inspection station and the unloading station; the battery cell pre-welding production line also includes a cache mechanism and a replenishing mechanism: the cache mechanism is arranged corresponding to the cache station, for pre-storing qualified battery cells; the replenishing mechanism is arranged corresponding to the replenishing station, and includes a second picking part, and the second picking part is used to pick up the qualified battery cells and replenish the battery cells transferred by the NG sorting mechanism 10.

[0091] When unqualified cells are transported in the magnetic levitation conveyor line 02, there are empty spaces in the cell fixture 022, which will cause empty grabbing during the subsequent unloading process. For this reason, in one embodiment of the present invention, the feeding mechanism is provided. After the NG classification mechanism 10 removes unqualified cells, the second picking part 111 picks up qualified cells in the cache mechanism 09 and transports them to the empty spaces of the cell fixture 022 of the magnetic levitation conveyor line 02. It can be understood that the cache mechanism 09 can be at least one group of separately placed cell fixtures 022 or a grid adapted to the cell. The present invention does not limit the specific structure of the cache mechanism 09, as long as it can store the unqualified cells.

[0092] See also Fig.12In one embodiment of the present invention, in order to facilitate blanking and processing in the subsequent process, it is necessary to arrange every two positive and negative electrodes of the battery cell opposite to each other. For this purpose, a flipping station located between the welding station and the blanking station is also formed on the frame 01. The battery cell pre-welding production line also includes a flipping device 12, and the flipping device 12 includes a flipping base 121, a first slide 122, a second slide 123, a rotating mechanism 124 and a sensor 126: the flipping base 121 is arranged corresponding to the flipping station; the first slide 122 is arranged on the flipping base 121 and extends along a first direction; the second slide 123 is movably installed on the first slide 122 and extends along a second direction, and the extension direction of the second slide 123 intersects with the extension direction of the first slide 122, so that the two slides are not in a co-linear state or a parallel state, so that the rotating mechanism 124 has at least two active directions to ensure its range of activity; one end of the rotating mechanism 124 is rotatably installed on The second slide 123 has 2N flipping clamps 125 rotatably installed at the other end. It can be understood that there are an even number of the flipping clamps 125, and every two of the flipping clamps 125 are correspondingly arranged to flip the battery cell during the rotation of the flipping clamp 125. In the present embodiment, each rotating mechanism 124 is provided with two flipping clamps 125. The flipping clamps 125 can be two clamps that can approach each other, or can be negative pressure suction nozzles. The present invention does not limit this, as long as it can stably pick up the battery cell; the sensor 126 is used to identify the positive and negative poles of the battery cell to be flipped; wherein, the flipping clamp 125 is used to flip every two of the battery cells to the positive and negative poles are arranged relative to each other; when the magnetic levitation transport line transports the battery cell to the flipping station, the rotating mechanism 124 approaches the battery cell through the first slide 122 and the second slide 123, and the flipping clamps 125 clamp the battery cell in turn, and rotate every two of the battery cells to the positive and negative poles to be arranged relative to each other, so as to facilitate unloading and subsequent processing.

[0093] Specifically, it is necessary to understand that in order to distinguish the positive and negative poles of the battery cell, the positive and negative pole ears of the battery cell have different colors, and the sensor 126 can be a color sensor, which identifies the positive and negative poles of the battery cell by identifying the colors of the positive and negative pole ears of the battery cell, and then determines whether the positive and negative poles of each two battery cells are set correspondingly; in this embodiment, the positive pole of the battery cell is blue and the negative pole is red, and the present invention is not limited to this, as long as it is easy to distinguish. In another embodiment of the present invention, since the positive and negative poles of the battery cell are of different materials, thicknesses or lengths, the sensor 126 can be a visual sensor, which is identified by identifying the appearance of the positive and negative poles of the battery cell. The present invention does not limit the type of sensor, as long as it can identify the positive and negative poles of the battery cell.

[0094] In addition, in order to better cut the battery cells, please refer to Fig.13 In one embodiment of the present invention, the unloading device 04 includes an unloading base 041, a first slide rail 042 and a second robotic arm 043; the unloading base 041 is arranged at the unloading station; the first slide rail 042 is arranged on the unloading base 041; the second robotic arm 043 is slidably mounted on the first slide rail 042, and includes at least one unloading fixture 044, which is used to clamp the battery cell on the magnetic levitation transport line and transport it to the next station; when the battery cell of the magnetic levitation transport line is transported, the second robotic arm 043 slides in the horizontal direction along the first slide rail 042 to move the unloading fixture 044 to the top of the battery cell, and the unloading fixture 044 corresponds to the battery cell fixture 022. When the battery cell fixture 022 releases the clamping of the battery cell, the unloading fixture 044 turns back to the top of the next transport line, and then releases the clamping of the battery cell to complete the unloading.

[0095] Specifically, the unloading clamp 044 includes two unloading battery cell clamps arranged opposite to each other, and an unloading battery cell clamp driving assembly for driving the two unloading battery cell clamps to move closer to or away from each other. In the present embodiment, each of the unloading battery cell clamps includes at least one clamping arm, and the clamping arm is formed with a convex portion facing the other unloading battery cell clamp arranged opposite to each other at the free end away from the second mechanical arm 043. The clamping arm is used to clamp the side wall of the battery cell, and the convex portion is used to support the bottom of the battery cell to prevent the battery cell from falling during the clamping process, thereby increasing the reliability of clamping. It can be understood that the more clamping arms there are, the more stable the clamping effect on the battery cell is. The specific number can be set according to actual needs, and the present invention does not limit the specific number of the clamping arms.

[0096] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery pre-welding production line based on magnetic levitation transportation, It is characterized in that The battery pre-welding production line has a plurality of workstations, including a loading workstation, a welding workstation and a unloading workstation sequentially arranged in the battery cell conveying direction. The battery cell pre-welding production line includes: frame; A magnetic levitation transport line is arranged on the frame, the transport path of the magnetic levitation transport line passes through the loading station, the welding station and the unloading station in sequence, and the magnetic levitation transport line is used to transport the battery core; A feeding device, arranged at the feeding station, for conveying the battery cells to the magnetic suspension transport line; A welding device, disposed at the welding station, for welding the tabs of the battery cell; and The unloading device is arranged at the unloading station and is used to unload the battery cells on the magnetic suspension transport line.

2. The battery core pre-welding production line based on magnetic levitation transportation as claimed in claim 1, It is characterized in that The welding device comprises: An ultrasonic welding machine, arranged corresponding to the welding station, for respectively welding the positive and negative electrodes of the battery cell tabs; and A welding fixture is used to transfer the battery core between the magnetic levitation transport line and the ultrasonic welding machine.

3. The battery core pre-welding production line based on magnetic levitation transportation as claimed in claim 2, It is characterized in that The welding stations are provided in a plurality, the plurality of welding stations include a positive electrode welding station and a negative electrode welding station, and the corresponding welding devices are provided in a plurality, the plurality of welding devices include: A positive electrode ultrasonic welding machine is provided corresponding to the positive electrode welding station and is used to weld the positive electrode tab of the battery cell; and A negative electrode ultrasonic welding machine is provided corresponding to the negative electrode welding station and is used for welding the negative electrode tab of the battery cell.

4. The battery core pre-welding production line based on magnetic levitation transportation as claimed in claim 1, It is characterized in that The frame is also provided with a cutting station between the welding station and the blanking station; The battery cell pre-welding production line also includes: The tab cutting mechanism is arranged at the cutting station, and is used for cutting the positive and negative tabs of the battery cell.

5. The battery core pre-welding production line based on magnetic levitation transportation as claimed in claim 4, It is characterized in that The frame is also provided with a sweeping station between the cutting station and the blanking station; The battery cell pre-welding production line also includes: The leveling mechanism is arranged at the leveling station, and the leveling mechanism includes a plurality of groups of first pressing plates and second pressing plates arranged opposite to each other, and at least one of the pressing plates is movably arranged to flatten the battery cell tabs when approaching another pressing plate.

6. The battery core pre-welding production line based on magnetic levitation transportation as claimed in claim 5, It is characterized in that The frame is provided with a cleaning station between the sweeping station and the unloading station. The battery pre-welding production line also includes: A cleaning mechanism is arranged at the cleaning station, and is used for cleaning the cleaned battery cells.

7. The battery core pre-welding production line based on magnetic levitation transportation as claimed in claim 1, It is characterized in that The frame is also provided with an inspection station and an NG classification station which are arranged in sequence between the welding station and the unloading station; The battery cell pre-welding production line also includes: A visual inspection component, including a visual camera, which is movably arranged at the inspection station to inspect the welding effect of the tabs and identify unqualified cells; The NG classification mechanism is arranged at the NG classification station and comprises a first picking-up part, wherein the first picking-up part is used to transfer unqualified battery cells on the magnetic levitation transport line.

8. The battery core pre-welding production line based on magnetic levitation transportation as claimed in claim 7, It is characterized in that The frame is also provided with a buffer station and a material replenishing station which are sequentially arranged between the detection station and the unloading station; The battery pre-welding production line also includes: A cache mechanism, arranged corresponding to the cache station, for pre-storing qualified battery cells; The feeding mechanism is arranged corresponding to the feeding station, and includes a second picking part, and the second picking part is used to pick up the qualified battery cells and correspondingly replenish the battery cells transported by the NG classification mechanism.

9. The battery core pre-welding production line based on magnetic levitation transportation as claimed in claim 1, It is characterized in that The frame is also provided with a turning station between the welding station and the blanking station. The battery cell pre-welding production line further includes a turning device, which includes: A flip base, arranged corresponding to the flip station; A first slide, disposed on the flip base and extending along a first direction; a second slide, movably mounted on the first slide and extending along a second direction, wherein the extension direction of the second slide intersects with the extension direction of the first slide; A rotating mechanism, one end of which is rotatably mounted on the second slide, and the other end of which is rotatably mounted with 2N flip fixtures; Sensor, used to identify the positive and negative poles of the battery cell to be flipped; Wherein, the flipping fixture is used to flip every two of the battery cells so that the positive and negative poles are arranged opposite to each other.

10. The battery core pre-welding production line based on magnetic levitation transportation as claimed in claim 1, It is characterized in that The frame is also provided with a short circuit detection station between the loading station and the welding station; The battery cell pre-welding production line also includes: A short circuit testing mechanism is arranged corresponding to the short circuit detection station, and comprises a testing probe, wherein the testing probe is movably arranged in the short circuit testing mechanism to contact the battery cell.

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