Welding clamping device and pole welding method

Abstract

The present application relates to the technical field of battery modules, and specifically provides a welding clamping device and a pole welding method used in the manufacturing process of battery modules. The welding clamping device includes a copper nozzle mechanism, a slide rail, a clamping drive mechanism and a clamping mechanism; and the copper nozzle mechanism includes multiple groups of copper nozzle assemblies, each group of the copper nozzle assemblies includes a slider, a copper nozzle drive, a fixing member and multiple welding copper nozzles fixed on the fixing member; the slider is driven by the copper nozzle drive member to slide along the track direction of the slide rail, and the fixing members of multiple groups of copper nozzle mechanisms are driven by the slider to move to corresponding clamping positions along the track direction respectively, and then the clamping mechanism is driven by the clamping drive mechanism to clamp the fixing member, so that the multiple welding copper nozzles fixed on the fixing member press the bar onto the pole. Based on the welding clamping device, the position adjustment of multiple groups of copper nozzle assemblies can be realized independently, which improves the alignment accuracy between the welding copper nozzles and the poles of the battery cells.

Description

Technical Field

[0001] The present application relates to the technical field of battery modules, and in particular to a welding clamping device and a pole welding method used in a battery module manufacturing process. Background Art

[0002] The battery module is an important component in the battery system. It is usually composed of several battery cells, connectors, a battery management system (BMS) and a shell. The main function of the battery module is to connect multiple battery cells together, in parallel or in series, to increase the voltage and energy storage capacity of the battery system.

[0003] Laser welding is an important step in the production and manufacturing process of battery modules. Usually, electrical connection between multiple battery cells is achieved by bar welding. Before performing bar welding, the bar is pressed against the pole by a welding copper nozzle to ensure good contact between the two. However, most of the existing welding clamping mechanisms are integral designs. Due to the instability of the thickness of the battery cells and the pressure on the foam between the battery cells, as well as the accumulation of tolerances after the assembly of dozens of battery cells, a large position deviation will occur between the welding copper nozzle and the pole, which will easily lead to the copper nozzle blocking the light and making it impossible to weld or poor welding during the welding process.

[0004] Even if a group-designed welding clamping mechanism is adopted, since it is impossible to ensure that the clamping forces of welding clamping mechanisms in different groups are exactly the same, during the process of the welding clamping mechanism clamping the battery module to be welded, the battery module to be welded is prone to position displacement under the clamping force of the welding clamping mechanism, which may lead to poor welding during the welding process. Summary of the invention

[0005] In view of this, the purpose of the embodiments of the present application is to provide a welding clamping device and a pole welding method to solve the technical problem that the copper nozzle of the existing welding clamping mechanism easily blocks light and cannot weld or welds poorly during the welding process.

[0006] In a first aspect, an embodiment of the present application provides a welding clamping device, the device comprising: a copper nozzle mechanism, a slide rail, a clamping drive mechanism and a clamping mechanism;

[0007] The copper nozzle mechanism comprises a plurality of groups of copper nozzle assemblies, each group of the copper nozzle assemblies comprises a slider, a copper nozzle driving member, a fixing member and a plurality of welding copper nozzles fixed on the fixing member;

[0008] The slider is slidably connected to the slide rail and fixedly connected to the fixing member; the copper nozzle driving member is configured to drive the slider to slide along the track direction of the slide rail; the slider is configured to drive the fixing member to move along the track direction;

[0009] The pressing driving mechanism is configured to drive the pressing mechanism to press the fixing member, so that the welding copper nozzle presses the bar onto the pole;

[0010] Among them, the device also includes: a pressure plate driving component and a module pressure plate arranged above the battery module to be welded; the pressure plate driving component is configured to drive the module pressure plate to approach or move away from the battery module to be welded; and before the clamping driving mechanism drives the clamping mechanism to clamp the copper nozzle mechanism, drives the module pressure plate to clamp the battery module to be welded; the side of the module pressure plate close to the battery module to be welded is configured to fit with the upper surface of the battery module to be welded during the process of the clamping driving mechanism driving the clamping mechanism to clamp the copper nozzle mechanism.

[0011] In the above-mentioned implementation process, the welding clamping device includes a copper nozzle mechanism, a slide rail, a clamping drive mechanism and a clamping mechanism; and the copper nozzle mechanism includes multiple groups of copper nozzle assemblies, each group of the copper nozzle assemblies includes a slider, a copper nozzle drive, a fixing member and multiple welding copper nozzles fixed on the fixing member; the slider is driven by the copper nozzle drive member to slide along the track direction of the slide rail, and the fixing members of multiple groups of copper nozzle mechanisms are driven by the slider to move to corresponding clamping positions along the track direction respectively, and then the clamping mechanism is driven by the clamping drive mechanism to clamp the fixing member, so that the multiple welding copper nozzles fixed on the fixing member press the bar piece on the pole. Based on the welding clamping device, the position adjustment of multiple groups of copper nozzle assemblies can be realized independently, which reduces the influence of the tolerance accumulation after the battery cell assembly on the alignment position between the welding copper nozzle and the battery cell pole, thereby improving the alignment accuracy between the welding copper nozzle and the battery cell pole. It solves the technical problem that the copper nozzle of the existing welding clamping mechanism is prone to block light and cannot weld or weld poorly during welding.

[0012] Secondly, the welding clamping device provided by the present application is provided with a module clamping plate above the battery module to be welded, and before the clamping mechanism clamps the copper nozzle mechanism, the module clamping plate is driven to clamp the battery module to be welded; thereby ensuring that the battery module to be welded will not be displaced due to the clamping force of the clamping mechanism during the process of the clamping driving mechanism driving the clamping mechanism to clamp the copper nozzle mechanism, thereby further improving the welding yield of the battery module to be welded.

[0013] In addition, the welding clamping device provided in the present application can also increase or decrease the number of copper nozzle components included in the copper nozzle mechanism according to actual needs to adapt to more diverse actual welding scenarios, thereby improving the flexibility of the welding clamping device in actual applications.

[0014] Optionally, in an embodiment of the present application, the clamping mechanism includes a plurality of copper nozzle clamping members arranged corresponding to the copper nozzle assembly; the clamping drive mechanism includes a plurality of clamping drive members arranged corresponding to the copper nozzle clamping members; the clamping drive member is configured to drive the copper nozzle clamping member to approach or move away from the fixing member.

[0015] In the above implementation process, since the copper nozzle clamping member and the clamping driving member are both arranged corresponding to the copper nozzle assembly, the uniformity of the clamping force on each copper nozzle assembly can be ensured, and the clamping stability between the welding copper nozzle, the bar piece and the pole is improved. In addition, after increasing or decreasing the number of copper nozzle assemblies, based on multiple copper nozzle clamping members and clamping driving members, the uniformity of the clamping force on each copper nozzle assembly and the clamping stability between the welding copper nozzle, the bar piece and the pole can be guaranteed.

[0016] Optionally, in an embodiment of the present application, the clamping drive member includes a clamping cylinder; the device also includes: a solenoid valve; the solenoid valve is configured to control the piston of the clamping cylinder to advance or retreat so as to drive the copper nozzle clamping member to move closer to or away from the fixing member; wherein each of the clamping cylinders is connected to the solenoid valve via an air pipe of the same length.

[0017] In the above implementation process, the clamping drive includes a clamping cylinder, and each clamping cylinder is connected to the solenoid valve using an air pipe of the same length, and the actions of all the clamping cylinders are uniformly controlled based on the solenoid valve to ensure the consistency of the actions of multiple clamping cylinders. This ensures that each welding copper nozzle can clamp the corresponding bar and pole.

[0018] Optionally, in an embodiment of the present application, the manufacturing material of the module pressing plate includes rubber.

[0019] In the above implementation process, since the manufacturing material of the module pressing plate includes rubber with a large friction coefficient, the friction between the module pressing plate and the surface of the battery module to be welded can be increased, thereby better avoiding the position displacement of the battery module to be welded due to the clamping force of the clamping mechanism.

[0020] Optionally, in an embodiment of the present application, the pressure plate driving component includes: a pressing cylinder, a cylinder fixing plate, a plurality of linear bearings passing through the cylinder fixing plate, and a plurality of pressing guide columns movably arranged in the linear bearings; the pressing piston rod of the pressing cylinder passes through the cylinder fixing plate and is fixedly connected to a side of the module pressing plate away from the battery module to be welded; one end of the pressing guide column is fixedly connected to the module pressing plate; the pressing cylinder is configured to drive the module pressing plate to approach or move away from the battery module to be welded.

[0021] In the above implementation process, since the pressure plate driving component includes a pressing cylinder, a cylinder fixing plate, a plurality of linear bearings passing through the cylinder fixing plate, and a plurality of pressing guide columns movably arranged in the linear bearings; in the process of the pressing cylinder driving the module pressure plate to approach or move away from the battery module to be welded, the movement process of the module pressure plate can be guided based on the pressing guide columns to improve the movement stability of the module pressure plate.

[0022] In a second aspect, an embodiment of the present application further provides a pole welding method, which is applied to the welding clamping device as described in the first aspect above; the welding clamping device includes a copper nozzle mechanism, a slide rail, a clamping drive mechanism and a clamping mechanism; the copper nozzle mechanism includes multiple groups of copper nozzle assemblies, each group of the copper nozzle assemblies includes a slider, a copper nozzle driving member, a fixing member and multiple welding copper nozzles fixed on the fixing member; the method includes:

[0023] Determine the welding position of the copper nozzle of each group of the copper nozzle assembly according to the position of the battery cell pole of the battery module to be welded;

[0024] Based on the copper nozzle driving member driving the sliding block to drive the fixing member to move along the track direction of the slide rail to the copper nozzle welding position;

[0025] Based on the pressing driving mechanism, the pressing mechanism is driven to press the fixing member, so that the welding copper nozzle presses the bar piece onto the pole;

[0026] The welding assembly is used to perform pole welding on the battery module to be welded.

[0027] In the above implementation process, after determining the copper nozzle welding position of each group of copper nozzle assemblies according to the position of the battery cell pole of the battery module to be welded, the slider of each group of copper nozzle assemblies is driven by the copper nozzle driving member to drive the fixing member to move to the copper nozzle welding position along the track direction of the slide rail, and the clamping mechanism is driven to clamp the fixing member at the copper nozzle welding position, so that the welding copper nozzle presses the bar piece on the pole, and then the welding assembly is used to weld the pole of the battery module to be welded. This method can individually control multiple groups of copper nozzle assemblies to move to corresponding copper nozzle welding positions, thereby improving the alignment accuracy between the welding copper nozzle and the battery cell pole. It solves the technical problem that the existing welding clamping mechanism is prone to the phenomenon that the copper nozzle blocks light and cannot weld or the welding is poor during welding.

[0028] Optionally, in an embodiment of the present application, when the welding clamping device also includes a pressure plate driving component and a module pressure plate arranged above the battery module to be welded; before the clamping mechanism is driven by the clamping driving mechanism to clamp the fixing component, the method also includes: based on the pressure plate driving component, driving the module pressure plate to clamp the battery module to be welded; wherein, in the process of the clamping driving mechanism driving the clamping mechanism to clamp the copper nozzle mechanism, a side of the module pressure plate close to the battery module to be welded is in contact with the upper surface of the battery module to be welded.

[0029] In the above-mentioned implementation process, before the clamping mechanism clamps the copper nozzle mechanism, the module pressing plate is driven to clamp the battery module to be welded, so that the side of the module pressing plate close to the battery module to be welded is in contact with the upper surface of the battery module to be welded; thereby ensuring that in the process of the clamping drive mechanism driving the clamping mechanism to clamp the copper nozzle mechanism, the battery module to be welded will not be displaced due to the clamping force of the clamping mechanism.

[0030] Optionally, in an embodiment of the present application, the welding assembly further includes: a welding galvanometer, a galvanometer moving mechanism, and a camera fixed on one side of the welding galvanometer along the track direction of the slide rail; the galvanometer moving mechanism is configured to drive the welding galvanometer to move along the track direction;

[0031] Before determining the copper nozzle welding position of each group of the copper nozzle assemblies according to the cell pole position of the battery module to be welded, the method further includes: driving the welding galvanometer to move along the track direction based on the galvanometer moving mechanism, and controlling the camera to collect module image data during the movement; wherein the module image data includes reference point data; determining the cell pole position according to the module image data and the corresponding relationship between the reference point data and the battery module pole position.

[0032] In the above implementation process, before the module welding process, the pole position and height of each battery module to be welded are detected to obtain the detection data; and the detection data is bound to the module reference point (including the correspondence between the reference point data and the position / height of the battery module pole). The module image data including the reference point data is collected by the camera, and the position of the battery cell pole can be determined based on the module image data and the correspondence between the reference point data and the battery module pole position.

[0033] Optionally, in an embodiment of the present application, the welding galvanometer includes a 3D galvanometer; the welding assembly further includes: a rangefinder fixed on the other side of the welding galvanometer along the track direction of the slide rail;

[0034] The method of using a welding assembly to perform pole welding on the battery module to be welded includes: driving the 3D galvanometer to move along the track direction based on the galvanometer moving mechanism, and controlling the rangefinder to measure the battery cell pole height data during the movement; determining the defocus compensation value of the 3D galvanometer at each pole welding position according to the battery cell pole height data; and adjusting the focal length parameter of the 3D galvanometer at the corresponding pole welding position according to the defocus compensation value.

[0035] In the above implementation process, the battery cell pole height data is measured by a rangefinder, the defocus compensation value of the 3D galvanometer at each pole welding position is determined according to the battery cell pole height data, and the focal length parameters of the 3D galvanometer at the corresponding pole welding position are adjusted according to the defocus compensation value, thereby further improving the welding quality.

[0036] Optionally, in an embodiment of the present application, the battery cell pole height data includes pole height data of multiple target positions; determining the defocus compensation value of the 3D galvanometer at each pole welding position based on the battery cell pole height data includes: determining the reference pole height of the battery module to be welded based on the module image data and the correspondence between the reference point data and the battery module pole height; determining the defocus compensation value of the 3D galvanometer at each pole welding position based on the pole height data of the multiple target positions and the reference pole height.

[0037] In the above implementation process, before the module welding process, the pole position and height of each battery module to be welded are detected to obtain detection data; and the detection data is bound to the module reference point (including the correspondence between the reference point data and the position / height of the battery module pole). According to the module image data and the correspondence between the reference point data and the battery module pole height, the reference pole height of the battery module to be welded can be determined. There is no need to detect the pole height of each battery cell based on the rangefinder, which shortens the actual measurement time of the rangefinder, thereby improving the efficiency of pole welding.

[0038] The beneficial effects of the present application include at least: the welding clamping device can drive the slider to slide along the track direction of the slide rail through the copper nozzle driving member, and the slider drives the fixing members of multiple copper nozzle mechanisms to move to corresponding clamping positions along the track direction respectively, and then the clamping mechanism is driven by the clamping driving mechanism to clamp the fixing member, so that the multiple welding copper nozzles fixed on the fixing member press the bar onto the pole. Since the welding clamping device can independently adjust the position of multiple copper nozzle assemblies, the influence of the tolerance accumulation after the battery cell assembly on the alignment position between the welding copper nozzle and the battery cell pole is reduced, thereby improving the alignment accuracy between the welding copper nozzle and the battery cell pole. The technical problem that the existing welding clamping mechanism is prone to the copper nozzle blocking the light and failing to weld or poor welding during the welding process is solved.

[0039] Secondly, the welding clamping device provided by the present application is provided with a module clamping plate above the battery module to be welded, and before the clamping mechanism clamps the copper nozzle mechanism, the module clamping plate is driven to clamp the battery module to be welded; thereby ensuring that the battery module to be welded will not be displaced due to the clamping force of the clamping mechanism during the process of the clamping driving mechanism driving the clamping mechanism to clamp the copper nozzle mechanism, thereby further improving the welding yield of the battery module to be welded.

[0040] In addition, based on the welding clamping device, the number of copper nozzle components included in the copper nozzle mechanism can be increased or reduced according to actual needs to adapt to more diverse actual welding scenarios, thereby improving the flexibility of the welding clamping device in actual applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A structural schematic diagram of a welding clamping device provided in an embodiment of the present application;

[0043] Figure 2 A schematic diagram of the structure of another welding clamping device provided in an embodiment of the present application;

[0044] Figure 3 A schematic flow chart of a pole welding method provided in an embodiment of the present application;

[0045] Figure 4 A schematic structural diagram of a welding assembly provided in an embodiment of the present application.

[0046] Figure markings: 10-welding clamping device; 101-copper nozzle mechanism; 1010-copper nozzle assembly; 1011-slider; 1012-fixing part; 1013-welding copper nozzle; 102-slide rail; 103-clamping drive mechanism; 1030-clamping drive member; 104-clamping mechanism; 1040-copper nozzle clamping member; 105-pressure plate drive member; 106-module pressure plate. DETAILED DESCRIPTION

[0047] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0049] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0050] See also Figure 1 FIG. 1 is a schematic diagram of the structure of a welding clamping device 10 provided in an embodiment of the present application. It should be noted that: Figure 1 Specifically shown is a schematic diagram of a top view of the welding clamping device 10. The welding clamping device 10 comprises: a copper nozzle mechanism 101, a slide rail 102, a clamping drive mechanism 103 and a clamping mechanism 104;

[0051] The copper nozzle mechanism 101 includes a plurality of copper nozzle assemblies 1010, each of which includes a slider 1011, a copper nozzle driving member, a fixing member 1012, and a plurality of welding copper nozzles 1013 fixed on the fixing member 1012;

[0052] The slider 1011 is slidably connected to the slide rail 102 and fixedly connected to the fixing member 1012; the copper nozzle driving member is configured to drive the slider 1011 to slide along the track direction of the slide rail 102; the slider 1011 is configured to drive the fixing member 1012 to move along the track direction;

[0053] The pressing driving mechanism 103 is configured to drive the pressing mechanism 104 to press the fixing member 1012, so that the welding copper nozzle 1013 presses the bar onto the pole;

[0054] Among them, the welding clamping device 10 also includes: a pressure plate driving component 105 and a module pressure plate 106 arranged above the battery module to be welded; the pressure plate driving component 105 is configured to drive the module pressure plate 106 to approach or move away from the battery module to be welded; and before the clamping driving mechanism 103 drives the clamping mechanism 104 to clamp the copper nozzle mechanism 101, the module pressure plate 106 is driven to clamp the battery module to be welded; the module pressure plate 106 is close to one side of the battery module to be welded, and is configured to fit with the upper surface of the battery module to be welded during the process of the clamping driving mechanism 103 driving the clamping mechanism 104 to clamp the copper nozzle mechanism.

[0055] The copper nozzle mechanism 101 includes a plurality of groups of copper nozzle components 1010 , and the specific implementation method of each group of copper nozzle components 1010 may be the same or may not be completely the same. Figure 1 The positional relationship between the three welding assemblies and the battery modules to be welded is only shown by way of example. Specifically, the number of welding copper nozzles 1013 fixed on the fixing member 1012 in different copper nozzle assemblies 1010, the specific size or shape of the slider 1011, and the length of the fixing member 1012 can be the same or different. The number of welding copper nozzles 1013 fixed on the fixing member 1012 in the copper nozzle assembly 1010 can be 3, 6, 10 or other reasonable values. Figure 1 1013 is fixed on the fixing member 1012 in different copper nozzle assemblies 1010, and the number of the welding copper nozzles 1013 is the same, which is 8. The copper nozzle driving member can be realized by a motor, a cylinder or a hydraulic cylinder. The copper nozzle driving member can drive any slider 1011 to slide along the track direction of the slide rail 102, so as to drive the fixing member 1012 fixedly connected to the slider 1011 to move independently along the above track direction.

[0056] Among them, the slide rail 102 can be realized by a screw-nut structure or a track provided with a linear slide. When the slide rail 102 is realized by a screw-nut structure, the track direction of the slide rail 102 refers to the moving direction of the nut along the screw; when the slide rail 102 is realized by a track provided with a linear slide, the track direction of the slide rail 102 refers to the setting direction of the linear slide. The clamping drive mechanism 103 can be realized by a motor, a cylinder or a hydraulic cylinder. The clamping mechanism 104 can be realized by a clamping plate or a plurality of guide clamping columns. The clamping drive mechanism 103 can be specifically realized by a single clamping drive member or a plurality of clamping drives corresponding to the copper nozzle assembly 1010, and the clamping mechanism 104 can also be specifically realized by a single copper nozzle clamping member or a plurality of copper nozzle clamping members corresponding to the copper nozzle assembly 1010. Figure 1 Specifically, the situation that "the pressing drive mechanism 103 is implemented by a plurality of pressing drive members corresponding to the copper nozzle assembly 1010, and the pressing mechanism 104 is implemented by a plurality of copper nozzle pressing members corresponding to the copper nozzle assembly 1010" is shown. The pressing drive mechanism 103 can drive the pressing mechanism 104 to approach or move away from the fixing member 1012, and by driving the pressing mechanism 104 to approach and press the fixing member 1012, the plurality of welding copper nozzles 1013 fixed on the fixing member 1012 press the bar sheet onto the pole.

[0057] The platen driver 105 can be implemented by a motor, a cylinder or a hydraulic cylinder. The module platen 106 can be made of a material with a large friction coefficient; preferably, a soft material with a large friction coefficient (such as rubber, leather, etc.) can be used. The material of the module platen 106 can be transparent or opaque. Figure 1 It is only schematically shown that the manufacturing material of the module pressing plate 106 is transparent. Specifically, the pressing plate driving member 105 may include a pressing plate cylinder, a pressing plate cylinder fixing plate and a plurality of pressing plate guide columns. One side of the pressing plate cylinder fixing plate is fixedly connected to the piston of the pressing plate cylinder, and the other side is fixedly connected to one end of the pressing plate guide column. The other end of the pressing plate guide column is used to press the module pressing plate 106. By arranging the module pressing plate 106 above the battery module to be welded, and before the clamping mechanism 104 clamps the copper nozzle mechanism 101 (the fixing member 1012 of the middle copper nozzle assembly 1010), the pressing plate driving member 105 drives the module pressing plate 106 to clamp the battery module to be welded; thereby ensuring that in the process of the clamping driving mechanism 103 driving the clamping mechanism 104 to clamp the copper nozzle mechanism 101, the battery module to be welded will not be displaced due to the clamping force of the clamping mechanism 104. By using a module pressing plate 106 made of a material with a large friction coefficient such as rubber, leather or polyformaldehyde, the friction between the module pressing plate 106 and the surface of the battery module to be welded can be increased, thereby better preventing the battery module to be welded from being displaced due to the clamping force of the clamping mechanism 104.

[0058] It can be seen that the welding clamping device 10 provided in the embodiment of the present application includes a copper nozzle mechanism 101, a slide rail 102, a clamping drive mechanism 103 and a clamping mechanism 104; and the copper nozzle mechanism 101 includes multiple groups of copper nozzle assemblies 1010, each group of copper nozzle assemblies 1010 includes a slider 1011, a copper nozzle drive, a fixing member 1012 and multiple welding copper nozzles 1013 fixed on the fixing member 1012; the slider 1011 is driven by the copper nozzle drive member to slide along the track direction of the slide rail 102, and the fixing members 1012 of multiple groups of copper nozzle mechanisms 101 are driven by the slider 1011 to move to corresponding clamping positions along the track direction respectively, and then the clamping drive mechanism 103 drives the clamping mechanism 104 to clamp the fixing member 1012, so that the multiple welding copper nozzles 1013 fixed on the fixing member 1012 press the bar onto the pole. Since the welding clamping device 10 can independently adjust the positions of multiple copper nozzle assemblies 1010, the influence of the tolerance accumulation after the battery cell assembly on the alignment position between the welding copper nozzle 1013 and the battery cell pole is reduced, thereby improving the alignment accuracy between the welding copper nozzle 1013 and the battery cell pole. The technical problem that the existing welding clamping mechanism is prone to the copper nozzle blocking light and failing to weld or poor welding during welding is solved.

[0059] Secondly, the welding clamping device 10 provided in the present application is provided with a module clamping plate 106 above the battery module to be welded, and before the clamping mechanism 104 clamps the copper nozzle mechanism 101, the module clamping plate 106 is driven to clamp the battery module to be welded; thereby ensuring that the battery module to be welded will not be displaced due to the clamping force of the clamping mechanism 104 during the process of the clamping driving mechanism 103 driving the clamping mechanism 104 to clamp the copper nozzle mechanism 101. The welding yield of the battery module to be welded is further improved.

[0060] in, Figure 1 The case where a welding clamping device 10 is provided on one side of the battery module to be welded is shown. For the blade battery module, welding clamping devices 10 can be provided on both sides of the blade battery module to be welded (can be provided at the same welding station, or two different welding stations) to improve the welding efficiency of the battery module to be welded. Specifically, in the case where welding clamping devices 10 located on both sides of the blade battery module to be welded are provided at two different welding stations, respectively, a pole welding clamping operation can be performed on one side of the blade battery module to be welded at the previous welding station; after the pole welding on one side is completed, the blade battery module to be welded is directly transferred to the next welding station by a conveying device; based on the next welding station, a pole welding clamping operation is performed on the other side of the blade battery module to be welded to complete the pole welding clamping operation on both sides of the blade battery module to be welded. In the case where welding clamping devices 10 are respectively arranged on both sides of the blade battery module to be welded at the same welding station, the welding clamping operations on the poles on both sides of the blade battery module to be welded can be simultaneously performed based on the welding clamping devices 10 on both sides, thereby greatly improving the welding efficiency of the blade battery module while ensuring the welding yield.

[0061] Please refer to Figure 2 , Figure 2 A schematic structural diagram of another welding clamping device 10 provided in an embodiment of the present application.

[0062] In some optional embodiments, the clamping mechanism 104 includes a plurality of copper nozzle clamping members 1040 arranged corresponding to the copper nozzle assembly 1010; the clamping drive mechanism 103 includes a plurality of clamping drive members 1030 arranged corresponding to the copper nozzle clamping members 1040; the clamping drive member 1030 is configured to drive the copper nozzle clamping member 1040 to approach or move away from the fixing member 1012.

[0063] Among them, the copper nozzle clamping member 1040 can be realized by a copper nozzle clamping plate or a plurality of copper nozzle clamping guide columns. The clamping drive member 1030 can be realized by a motor, a cylinder or a hydraulic cylinder, etc. This application does not make any specific restrictions on this. Since the copper nozzle clamping member 1040 and the clamping drive member 1030 are both arranged corresponding to the copper nozzle assembly 1010, the uniformity of the clamping force received by each copper nozzle assembly 1010 can be guaranteed, and the clamping stability between the welding copper nozzle 1013, the bar piece and the pole is improved. In addition, after increasing or decreasing the number of copper nozzle assemblies 1010, based on a plurality of copper nozzle clamping members 1040 and the clamping drive member 1030, the uniformity of the clamping force received by each copper nozzle assembly 1010 and the clamping stability between the welding copper nozzle 1013, the bar piece and the pole are provided. Figure 2 It specifically shows the situation that "the clamping mechanism 104 includes a plurality of copper nozzle clamping members 1040 arranged corresponding to the copper nozzle assembly 1010, and the clamping drive mechanism 103 includes a plurality of clamping drive members 1030 arranged corresponding to the copper nozzle clamping members 1040".

[0064] In some optional embodiments, the clamping drive 1030 includes a clamping cylinder; the welding clamping device 10 also includes: a solenoid valve; the solenoid valve is configured to control the piston of the clamping cylinder to advance or retreat so as to drive the copper nozzle clamping member 1040 to move closer to or away from the fixing member 1012; wherein each of the clamping cylinders is connected to the solenoid valve via an air pipe of the same length.

[0065] Wherein, in the case where the copper nozzle clamping member 1040 is implemented by a plurality of copper nozzle clamping guide posts, the welding clamping device 10 may further include a cylinder fixing plate, one end of the plurality of copper nozzle clamping guide posts is fixedly connected to one side of the cylinder fixing plate, and the other end of the plurality of copper nozzle clamping guide posts is used to clamp the corresponding fixing member 1012; the other side of the cylinder fixing plate is fixedly connected to the piston of the clamping cylinder, so that when the piston of the clamping cylinder moves forward or backward, the plurality of copper nozzle clamping guide posts fixed on the cylinder fixing plate are driven to approach or move away from the fixing member 1012. In the process of the plurality of copper nozzle clamping members 1040 successively clamping the fixing member 1012, the fixing member 1012 may be displaced due to the clamping force of the copper nozzle clamping members 1040, resulting in a gap between the fixing member 1012 that completes the clamping operation first and the copper nozzle clamping member 1040, and a cold weld or other poor welding phenomenon may occur. By setting each clamping cylinder to use an air pipe of the same length to connect to the solenoid valve, and uniformly controlling the actions of all clamping cylinders based on the solenoid valve, the consistency of the actions of multiple clamping cylinders can be ensured, thereby ensuring that each welding copper nozzle 1013 can clamp the corresponding bar and pole, thereby further improving the welding quality.

[0066] In some optional embodiments, the module pressing plate 106 is made of rubber. Since the module pressing plate 106 is made of rubber with a large friction coefficient, the friction between the module pressing plate 106 and the surface of the battery module to be welded can be increased, thereby better preventing the battery module to be welded from being displaced due to the clamping force of the clamping mechanism. In addition, the weight of rubber is relatively light, which can reduce the working intensity of the pressing plate driving member 105 and can also isolate current and heat.

[0067] In some optional embodiments, the pressure plate driving component 105 includes: a pressing cylinder, a pressing cylinder fixing plate, a plurality of linear bearings passing through the pressing cylinder fixing plate, and a plurality of pressing guide columns movably arranged in the linear bearings; the pressing piston rod of the pressing cylinder passes through the pressing cylinder fixing plate and is fixedly connected to a side of the module pressing plate 106 away from the battery module to be welded; one end of the pressing guide column is fixedly connected to the module pressing plate 106; the pressing cylinder is configured to drive the module pressing plate 106 to approach or move away from the battery module to be welded.

[0068] Among them, the number of linear bearings can be 2, 4 or other reasonable values, and this application does not make specific restrictions on this. Multiple linear bearings can be evenly arranged on the downward pressure cylinder fixing plate. The downward pressure guide column is fixedly connected to the module pressing plate 106 at one end close to the battery module to be welded. Since the pressing plate driving member 105 includes a downward pressure cylinder, a downward pressure cylinder fixing plate, multiple linear bearings that pass through the downward pressure cylinder fixing plate, and multiple downward pressure guide columns movably arranged in the linear bearings; in the process of the downward pressure cylinder driving the module pressing plate 106 to approach or move away from the battery module to be welded, the movement process of the module pressing plate 106 can be guided based on the downward pressure guide column to improve the movement stability of the module pressing plate 106. The pressing plate driving member 105 can also include multiple limiting columns, and the limiting column is connected to the downward pressure cylinder fixing plate at one end away from the battery module to be welded. Based on the limiting column, the minimum distance between the module pressing plate 106 and the downward pressure cylinder fixing plate can be limited.

[0069] An embodiment of the present application further provides a welding clamping system, the system comprising: two welding clamping devices 10 as described in any one of the first aspects above and arranged in mirror symmetry.

[0070] Among them, the distance between the two mirror-symmetrically arranged welding clamping devices 10 can be adjusted according to the actual battery cell height. The welding clamping system includes two mirror-symmetrically arranged welding clamping devices 10 as described in any of the first aspects above. When the battery module to be welded is realized by a square shell battery module, the welding clamping system can be used to simultaneously realize the pole welding clamping operation of the two square shell battery modules; when the battery module to be welded is realized by a blade battery module, the welding clamping system can be used to simultaneously realize the pole welding clamping operation on both sides of the blade battery module. Therefore, based on the welding clamping system, the welding efficiency of the battery module can be greatly improved.

[0071] It should be understood that the welding clamping system corresponds to the above-mentioned welding clamping device 10 embodiment. The specific functions of the welding clamping system can be found in the description above. To avoid repetition, the detailed description is appropriately omitted here.

[0072] Please refer to Figure 3 , Figure 3 A schematic flow chart of a pole welding method provided in an embodiment of the present application. The pole welding method is applied to a welding clamping device 10 as described in any one of the first aspects above; the welding clamping device 10 comprises a copper nozzle mechanism, a slide rail, a clamping drive mechanism and a clamping mechanism; the copper nozzle mechanism comprises a plurality of copper nozzle assemblies, each of which comprises a slide block, a copper nozzle drive member, a fixing member and a plurality of welding copper nozzles fixed on the fixing member; the method comprises:

[0073] S201, determining the copper nozzle welding position of each group of the copper nozzle assemblies according to the position of the battery cell pole of the battery module to be welded;

[0074] S202, based on the copper nozzle driving member driving the sliding block to drive the fixing member to move along the track direction of the slide rail to the copper nozzle welding position;

[0075] S203, based on the pressing driving mechanism, driving the pressing mechanism to press the fixing member, so that the welding copper nozzle presses the bar onto the pole;

[0076] S204, performing pole welding on the battery module to be welded using a welding assembly.

[0077] Among them, in step S201, the copper nozzle welding position of each group of copper nozzle assemblies can be determined according to the actual welding requirements and the position of the battery pole. Since each group of copper nozzle assemblies includes a plurality of welding copper nozzles fixed on the fixing member, the copper nozzle bias of the plurality of welding copper nozzles in each group of copper nozzle assemblies can be comprehensively considered according to the actual welding requirements and the position of the battery pole, and the copper nozzle welding position with the minimum comprehensive copper nozzle bias (the sum of the copper nozzle biases of the plurality of welding copper nozzles) can be determined. Specifically, the comprehensive copper nozzle bias of the copper nozzle assembly can be reduced by ensuring the alignment accuracy between the welding copper nozzle in the middle position of the copper nozzle assembly and the corresponding battery pole. The specific implementation methods of step S202 and step S203 can refer to the relevant description of the welding clamping device 10 above. In step S204, the welding assembly may include a welding galvanometer, a galvanometer moving mechanism capable of driving the welding galvanometer to move along the track direction; and may also include a laser welding machine for performing welding operations. After the bar is pressed tightly onto the pole using the welding copper nozzle, the laser focus of the laser welding machine can be aligned with the corresponding pole welding position through devices such as welding galvanometers, and the pole welding can be performed on the battery module to be welded.

[0078] In some optional embodiments, when the welding clamping device also includes a pressure plate driving component and a module pressure plate arranged above the battery module to be welded; in S203, before the clamping driving mechanism drives the clamping mechanism to clamp the fixing component, the method also includes: based on the pressure plate driving component driving the module pressure plate to clamp the battery module to be welded; wherein, in the process of the clamping driving mechanism driving the clamping mechanism to clamp the copper nozzle mechanism, a side of the module pressure plate close to the battery module to be welded is in contact with the upper surface of the battery module to be welded.

[0079] Among them, before the clamping mechanism clamps the copper nozzle mechanism, the module pressing plate is driven to clamp the battery module to be welded, so that the side of the module pressing plate close to the battery module to be welded is in contact with the upper surface of the battery module to be welded; thereby ensuring that in the process of the clamping driving mechanism driving the clamping mechanism to clamp the copper nozzle mechanism, the battery module to be welded will not be displaced due to the clamping force of the clamping mechanism. In particular, based on the above-mentioned welding clamping system, that is, including two mirror-symmetrically arranged welding clamping devices 10 as described in any of the above-mentioned first aspects, the pole welding of the blade battery module is realized: since it is necessary to weld the poles on both sides of the blade battery module, in the process of clamping the copper nozzle mechanism based on the clamping mechanisms on both sides, the blade battery module may be displaced due to the clamping mechanisms on both sides successively clamping the copper nozzle mechanism (that is, the welding copper nozzles on both sides successively clamp the poles on both sides), thereby causing a gap between the welding copper nozzle and the telecommunication pole, and may cause a cold weld or other poor welding phenomenon. Based on the welding clamping device and pole welding method provided by the present application, the above-mentioned problems can be well solved.

[0080] Please refer to Figure 4 , Figure 4 A schematic structural diagram of a welding assembly provided in an embodiment of the present application. Figure 4 The relative position relationship between the welding assembly and the welding clamping device 10 is also schematically shown. Figure 4 The optical fiber shown in is used to connect to a laser welding machine.

[0081] In some optional embodiments, the welding assembly further includes: a welding galvanometer, a galvanometer moving mechanism, and a camera fixed on one side of the welding galvanometer along the track direction of the slide rail; the galvanometer moving mechanism is configured to drive the welding galvanometer to move along the track direction;

[0082] Before S201, according to the position of the battery cell pole of the battery module to be welded, determining the copper nozzle welding position of each group of the copper nozzle assembly, the method further includes: driving the welding galvanometer to move along the track direction based on the galvanometer moving mechanism, and controlling the camera to collect module image data during the movement; wherein the module image data includes reference point data; determining the battery cell pole position according to the module image data and the correspondence between the reference point data and the battery module pole position.

[0083] Among them, the galvanometer moving mechanism can be realized by a six-axis robot or a translation axis. The camera can be fixed on any side of the welding galvanometer along the track direction, and this application does not make specific restrictions on this. Because before the module welding process, the pole position and height of each battery module to be welded will be detected to obtain detection data; and the detection data will be bound to the module reference point (including the correspondence between the reference point data and the battery module pole position / height). The module image data including the reference point data is collected by the camera, and the battery cell pole position can be determined based on the module image data and the correspondence between the reference point data and the battery module pole position.

[0084] In some optional embodiments, the welding galvanometer includes a 3D galvanometer; the welding assembly also includes: a rangefinder fixed on the other side of the welding galvanometer along the track direction of the slide rail; S204, using the welding assembly to perform pole welding on the battery module to be welded, including: based on the galvanometer moving mechanism, driving the 3D galvanometer to move along the track direction, and controlling the rangefinder to measure the battery cell pole height data during the movement; determining the defocus compensation value of the 3D galvanometer at each pole welding position according to the battery cell pole height data; adjusting the focal length parameter of the 3D galvanometer at the corresponding pole welding position according to the defocus compensation value.

[0085] in, Figure 4It is just an example to show that the camera is set on the left side of the welding galvanometer and the rangefinder is fixed on the right side of the welding galvanometer. The rangefinder can measure the battery cell pole height data, determine the defocus compensation value of the 3D galvanometer at each pole welding position according to the battery cell pole height data, and adjust the focal length parameters of the 3D galvanometer at the corresponding pole welding position according to the defocus compensation value, thereby further improving the welding quality. Compared with the 2D galvanometer, the 3D galvanometer has an additional lens moving mechanism and an internal focusing function, so that the focal length of the galvanometer can be adjusted in real time according to the defocus compensation value of each pole welding position, and the galvanometer position and focal length of the welding galvanometer can be coupled with the galvanometer moving mechanism. Therefore, the welding operation of the corresponding pole welding position can be completed based on the movement of the welding galvanometer by the laser welding machine, which greatly improves the laser utilization rate and welding efficiency and reduces the pole welding cost.

[0086] In some optional embodiments, the battery cell pole height data includes pole height data of multiple target positions; determining the defocus compensation value of the 3D galvanometer at each pole welding position based on the battery cell pole height data includes: determining the reference pole height of the battery module to be welded based on the module image data and the correspondence between the reference point data and the battery module pole height; determining the defocus compensation value of the 3D galvanometer at each pole welding position based on the pole height data of the multiple target positions and the reference pole height.

[0087] Among them, the cell pole height data may specifically include pole height data of 3 target positions, or may include pole height data of 5 or 6 target positions. The number of target positions may be adjusted according to parameters such as the number of cells included in the actual battery module to be welded and the thickness of the cell. The reference pole height may include height difference data between each cell pole and a reference cell pole (which may be one of the outermost cell poles). Specifically, the defocus compensation value of each pole welding position may be determined based on the average value of pole height data of multiple target positions and the reference pole height. Before the module welding process, the pole position and height of each battery module to be welded are detected to obtain detection data; and the detection data is bound to the module reference point (including the corresponding relationship between the reference point data and the battery module pole position / height). According to the module image data and the corresponding relationship between the reference point data and the battery module pole height, the reference pole height of the battery module to be welded can be determined. There is no need to detect the pole height of each battery cell based on a distance meter, which shortens the actual measurement time of the distance meter and improves the efficiency of pole welding.

[0088] In several embodiments provided by the embodiments of the present application, it should be understood that the disclosed device / system and method can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to the multiple embodiments of the embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and a part of the module, program segment or code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0089] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0090] The above description is only an optional implementation manner of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the embodiments of the present application, which should be covered within the protection scope of the embodiments of the present application.

Claims

1. A welding clamping device, characterized in that: The device comprises: a copper nozzle mechanism, a slide rail, a pressing drive mechanism and a pressing mechanism; The copper nozzle mechanism comprises a plurality of groups of copper nozzle assemblies, each group of the copper nozzle assemblies comprises a slider, a copper nozzle driving member, a fixing member and a plurality of welding copper nozzles fixed on the fixing member; The slider is slidably connected to the slide rail and fixedly connected to the fixing member; the copper nozzle driving member is configured to drive the slider to slide along the track direction of the slide rail; the slider is configured to drive the fixing member to move along the track direction; The pressing driving mechanism is configured to drive the pressing mechanism to press the fixing member, so that the welding copper nozzle presses the bar onto the pole; Wherein, the device further comprises: a pressing plate driving member and a module pressing plate arranged above the battery module to be welded; The pressing plate driving member is configured to drive the module pressing plate to approach or move away from the battery module to be welded; and before the clamping driving mechanism drives the clamping mechanism to clamp the copper nozzle mechanism, drives the module pressing plate to clamp the battery module to be welded; The module pressing plate is close to a side of the battery module to be welded, and is configured to be in contact with the upper surface of the battery module to be welded during the process in which the clamping mechanism drives the clamping mechanism to clamp the copper nozzle mechanism; Wherein, the clamping mechanism comprises a plurality of copper nozzle clamping members arranged corresponding to the copper nozzle assembly; the clamping drive mechanism comprises a plurality of clamping drive members arranged corresponding to the copper nozzle clamping members; the clamping drive member is configured to drive the copper nozzle clamping members to approach or move away from the fixing member; The clamping drive member includes a clamping cylinder; the device also includes: a solenoid valve; the solenoid valve is configured to control the piston of the clamping cylinder to advance or retreat so as to drive the copper nozzle clamping member to approach or move away from the fixing member; wherein each of the clamping cylinders is connected to the solenoid valve via an air pipe of the same length.

2. The device according to claim 1, characterized in that The manufacturing material of the module pressing plate includes rubber.

3. A pole welding method, characterized in that: The method is applied to the welding clamping device as described in claim 1 or 2 above; the welding clamping device comprises a copper nozzle mechanism, a slide rail, a clamping drive mechanism and a clamping mechanism; the copper nozzle mechanism comprises a plurality of copper nozzle assemblies, each of which comprises a slide block, a copper nozzle drive member, a fixing member and a plurality of welding copper nozzles fixed on the fixing member; the method comprises: Determine the welding position of the copper nozzle of each group of the copper nozzle assembly according to the position of the battery cell pole of the battery module to be welded; Based on the copper nozzle driving member driving the sliding block to drive the fixing member to move along the track direction of the slide rail to the copper nozzle welding position; Based on the pressing driving mechanism, the pressing mechanism is driven to press the fixing member, so that the welding copper nozzle presses the bar piece onto the pole; The welding assembly is used to perform pole welding on the battery module to be welded.

4. The method according to claim 3, characterized in that In the case where the welding clamping device further includes a pressing plate driving member and a module pressing plate disposed above the battery module to be welded; Before the pressing mechanism is driven by the pressing driving mechanism to press the fixing member, the method further includes: Based on the pressure plate driving member, the module pressure plate is driven to press the battery module to be welded; wherein, in the process of the pressing driving mechanism driving the pressing mechanism to press the copper nozzle mechanism, the side of the module pressure plate close to the battery module to be welded is in contact with the upper surface of the battery module to be welded.

5. The method according to claim 3 or 4, characterized in that: The welding assembly comprises: a welding galvanometer, a galvanometer moving mechanism, and a camera fixed on one side of the welding galvanometer along the track direction of the slide rail; the galvanometer moving mechanism is configured to drive the welding galvanometer to move along the track direction; Before determining the welding position of the copper nozzles of each group of the copper nozzle assemblies according to the positions of the battery cell poles of the battery module to be welded, the method further includes: Based on the galvanometer moving mechanism, the welding galvanometer is driven to move along the track direction, and the camera is controlled to collect module image data during the movement; wherein the module image data includes reference point data; The cell pole position is determined according to the module image data and the corresponding relationship between the reference point data and the battery module pole position.

6. The method according to claim 5, characterized in that The welding galvanometer includes a 3D galvanometer; the welding assembly also includes: a rangefinder fixed on the other side of the welding galvanometer along the track direction of the slide rail; The method of using a welding assembly to perform pole welding on the battery module to be welded comprises: Based on the galvanometer moving mechanism, the 3D galvanometer is driven to move along the track direction, and the rangefinder is controlled to measure the cell pole height data during the movement; Determine the defocus compensation value of the 3D galvanometer at each pole welding position according to the battery cell pole height data; The focal length parameter of the 3D galvanometer at the corresponding pole welding position is adjusted according to the defocus compensation value.

7. The method according to claim 6, characterized in that The battery cell pole height data includes pole height data of multiple target positions; The step of determining the defocus compensation value of the 3D galvanometer at each pole welding position according to the cell pole height data includes: Determine the reference pole height of the battery module to be welded according to the module image data and the corresponding relationship between the reference point data and the pole height of the battery module; According to the pole height data of the plurality of target positions and the reference pole height, a defocus compensation value of the 3D galvanometer at each pole welding position is determined.

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