Battery pre-weld system and battery pre-weld method

Abstract

The application discloses a battery pre-welding system and a battery pre-welding method. The battery pre-welding system comprises a conveying assembly, a ranging assembly and a pre-welding assembly. The conveying assembly comprises a battery carrier for carrying a battery to be welded and a conveying device for driving the battery carrier to move in a first direction, and the conveying assembly has a ranging station and a pre-welding station. The ranging assembly is arranged at the ranging station and comprises a ranging device for obtaining actual distance information of a plurality of positions of a welding surface to be welded in the first direction to a preset reference surface. The pre-welding assembly is arranged at the pre-welding station and comprises a laser galvanometer mirror for welding a plurality of welding positions of the welding surface to be welded. The control assembly is electrically connected with the ranging device and the pre-welding assembly, and is used for adjusting the distance between the laser focal point of the laser galvanometer mirror and the welding surface to be welded according to the actual distance information when the laser galvanometer mirror is controlled to weld the welding position. The battery pre-welding system according to the embodiment of the application is convenient for improving the welding effect.

Description

Technical Field

[0001] This invention relates to the field of battery welding, and in particular to a battery pre-welding system and a battery pre-welding method. Background Technology

[0002] In the production process of new energy lithium batteries, welding is required at multiple welding points on the surface of the battery to be welded. The battery to be welded is carried by a battery carrier and transported at high speed by a conveyor assembly. Due to unavoidable deviations in the design, production, installation, and operation of the battery carriers, it is impossible to guarantee the mechanical consistency of all battery carriers. During high-speed operation of the battery carriers, the amount of laser defocusing occurs when the batteries to be welded on different battery carriers receive the welding process, resulting in uneven laser energy during the welding process and thus affecting the welding effect. Summary of the Invention

[0003] This invention provides a battery pre-welding system and a battery pre-welding method, which facilitates the improvement of welding quality in the pre-welding process of batteries to be welded.

[0004] In a first aspect, the present invention provides a battery pre-welding system for pre-welding the surface of a battery to be welded. The battery pre-welding system includes: a transmission component, comprising a battery carrier for carrying the battery to be welded and a transport device for moving the battery carrier along a first direction; the transmission component having a ranging station and a pre-welding station arranged along the first direction; a ranging component disposed at the ranging station, the ranging component including a ranging device for acquiring actual distance information from multiple positions of the surface to be welded in the first direction to a preset reference surface, the preset reference surface being a surface perpendicular to a second direction, the second direction being orthogonal to the first direction; a pre-welding component disposed at the pre-welding station, the pre-welding component including a laser galvanometer for welding multiple positions of the surface to be welded; and a control component electrically connected to the ranging device and the pre-welding component, the control component being used to adjust the distance of the laser focus of the laser galvanometer relative to the surface to be welded according to the actual distance information when controlling the laser galvanometer to weld the positions to be welded.

[0005] According to an embodiment of the battery pre-welding system of the present invention, the transmission component has a ranging station and a pre-welding station arranged along a first direction. When the battery carrier carries the battery to be welded to the ranging station, the ranging device can acquire the actual distance information from multiple positions of the surface to be welded in the first direction to a preset reference surface. Subsequently, when the battery carrier carries the battery to be welded to the pre-welding station, the control component controls the laser galvanometer to weld at the position to be welded, and the control component adjusts the distance between the laser focus of the laser galvanometer and the surface to be welded according to the actual distance information. Even if there are structural or dimensional deviations in the battery carrier, or deviations in the standard placement position of the battery to be welded relative to the battery carrier, the control component can adjust the distance between the laser focus of the laser galvanometer and the surface to be welded in real time when controlling the laser galvanometer to weld at the position to be welded, compensating for the aforementioned possible deviations, thereby ensuring the uniformity of laser energy at multiple welding positions, and thus facilitating improved welding results.

[0006] According to the foregoing embodiment of the first aspect of the present invention, the battery carrier is provided with a triggering part, the ranging component further includes a first positioning detection element, the first positioning detection element is electrically connected to the control component, and the transport device transmits the battery carrier to the first initial position of the ranging station, so that the triggering part triggers the first positioning detection element.

[0007] According to any of the foregoing embodiments of the first aspect of the present invention, the ranging device includes a plurality of displacement sensors arranged along the first direction on the preset reference surface. When the battery to be welded is located at the ranging station, the plurality of displacement sensors face the surface to be welded, and each displacement sensor is capable of detecting the actual distance information from a detection point on the surface to be welded relative to the second direction to the preset reference surface.

[0008] According to any of the foregoing embodiments of the first aspect of the present invention, the ranging device includes a three-dimensional image acquisition unit and an image processing unit. The three-dimensional image acquisition unit is used to acquire an image of the relative position of the surface to be welded and the preset reference surface. The image processing unit is electrically connected to the image acquisition unit and the control component. The image processing unit obtains actual distance information from multiple positions of the surface to be welded along the first direction to the preset reference surface based on the image.

[0009] According to any of the foregoing embodiments of the first aspect of the present invention, the battery carrier is provided with a triggering unit, and the pre-welding assembly further includes a second positioning detection element and a position coordinate acquisition element. The second positioning detection element and the position coordinate acquisition element are electrically connected to the control component. The transport device transmits the battery carrier to the second initial position of the pre-welding station, such that the triggering unit triggers the second positioning detection element, and the position coordinate acquisition element is able to acquire the coordinate position of the battery carrier relative to the second initial position along the first direction.

[0010] According to any of the foregoing embodiments of the first aspect of the present invention, the pre-welding assembly further includes a reciprocating drive device, the reciprocating drive device being electrically connected to the control assembly, the laser galvanometer being disposed on the reciprocating drive device, and the reciprocating drive device being used to drive the laser galvanometer to move along the second direction.

[0011] According to any of the foregoing embodiments of the first aspect of the present invention, the laser galvanometer is a three-dimensional laser galvanometer, and the control component is able to obtain the actual welding trajectory corresponding to the battery to be welded based on the actual distance information, and obtain the three-dimensional coordinates of the laser focus corresponding to each position to be welded based on the actual welding trajectory, wherein the three-dimensional coordinates of the laser focus are used to control the three-dimensional laser galvanometer to weld the position to be welded.

[0012] In a second aspect, embodiments of the present invention provide a battery pre-welding method. The battery pre-welding method pre-welds the surface of the battery to be welded using a battery pre-welding system according to any of the foregoing embodiments of the first aspect of the present invention. The battery pre-welding method includes: controlling the transport device to transport the battery carrier carrying the battery to be welded to the ranging station; obtaining actual distance information from multiple positions of the surface to be welded in the first direction to the preset reference surface through the ranging device; obtaining the actual welding trajectory corresponding to the battery to be welded based on the actual distance information; controlling the transport device to transport the battery carrier carrying the battery to be welded to the pre-welding station; and adjusting the distance between the laser focus of the laser galvanometer and the surface to be welded based on the actual welding trajectory, and controlling the laser galvanometer to weld the position to be welded.

[0013] According to any of the foregoing embodiments of the second aspect of the present invention, the ranging device includes a plurality of displacement sensors arranged along the first direction on the preset reference surface. When the battery to be welded is located at the ranging station, the plurality of displacement sensors face the surface to be welded. Each displacement sensor is capable of detecting the actual distance information from a detection point on the surface to be welded relative to it along the second direction to the preset reference surface. Obtaining the actual distance information from multiple positions of the surface to be welded in the first direction to the preset reference surface through the ranging device includes: detecting multiple actual distance information from multiple detection points on the surface to be welded to the preset reference surface through the plurality of displacement sensors, wherein each detection point is opposite to a corresponding displacement sensor along the second direction.

[0014] According to any of the foregoing embodiments of the second aspect of the present invention, the battery carrier is provided with a triggering unit, and the ranging component further includes a first positioning detection element, the first positioning detection element being electrically connected to the control component. The transport device transmits the battery carrier to a first initial position of the ranging station, causing the triggering unit to trigger the first positioning detection element. The control component includes a data acquisition module, the data acquisition module being electrically connected to the plurality of displacement sensors and the first positioning detection element. Obtaining the actual distance information from the plurality of positions of the surface to be welded in the first direction to the preset reference surface through the ranging device includes: the data acquisition module periodically scanning whether the first positioning detection element is triggered; when the triggering unit triggers the first positioning detection element, collecting the distance sensing data of the plurality of displacement sensors as the actual distance information.

[0015] According to any of the foregoing embodiments of the second aspect of the present invention, the control component includes a calculation module, and the control component obtains the actual welding trajectory corresponding to the battery to be welded based on the actual distance information by: the calculation module fitting the actual distance information with a standard welding trajectory to obtain the actual welding trajectory.

[0016] According to any of the foregoing embodiments of the second aspect of the present invention, the control component further includes a flight welding control module and a compensation motion control module, the flight welding control module and the compensation motion control module being electrically connected to the calculation module. The pre-welding component further includes a reciprocating drive device, the reciprocating drive device being electrically connected to the compensation motion control module. The laser galvanometer is disposed on the reciprocating drive device, the reciprocating drive device being used to drive the laser galvanometer to move along the second direction. The flight welding control module is electrically connected to the laser galvanometer. The control component adjusts the distance between the laser focus of the laser galvanometer and the surface to be welded according to the actual welding trajectory, and controls the laser galvanometer... The welding process of the laser galvanometer at the position to be welded includes: the calculation module decomposing the actual welding trajectory according to the standard welding trajectory to obtain flight welding data and compensation data, wherein the flight welding data includes the two-dimensional coordinate data of the laser focus corresponding to each position to be welded on the preset reference plane, and the compensation data includes the displacement deviation between the actual welding trajectory and the standard welding trajectory at each position to be welded in the second direction; the flight welding control module controls the laser galvanometer to weld at the position to be welded according to the flight welding data; and the compensation motion control module controls the reciprocating drive device to drive the laser galvanometer to move along the second direction according to the compensation data.

[0017] According to any of the foregoing embodiments of the second aspect of the present invention, the ranging device includes a three-dimensional image acquisition unit and an image processing unit. The step of obtaining the actual distance information from multiple positions of the surface to be welded in the first direction to the preset reference surface through the ranging device includes: acquiring an image of the relative position of the surface to be welded and the preset reference surface through the three-dimensional image acquisition unit; and obtaining the actual distance information from multiple positions of the surface to be welded in the first direction to the preset reference surface based on the image.

[0018] According to any of the foregoing embodiments of the second aspect of the present invention, the laser galvanometer is a three-dimensional laser galvanometer, and the control component adjusts the distance between the laser focus of the laser galvanometer and the surface to be welded according to the actual welding trajectory, and controls the laser galvanometer to weld the position to be welded, including: the control component obtains the three-dimensional coordinates of the laser focus corresponding to each position to be welded according to the actual welding trajectory; and controls the three-dimensional laser galvanometer to weld the position to be welded by the three-dimensional coordinates of the laser focus.

[0019] According to the battery pre-welding method of the present invention, a control transport device transmits a battery carrier carrying the battery to be welded to a ranging station, and obtains actual distance information from multiple positions of the surface to be welded in a first direction to a preset reference surface through a ranging device. After obtaining the actual distance information, the control component obtains the actual welding trajectory corresponding to the battery to be welded based on the actual distance information. When the control transport device transmits the battery carrier carrying the battery to be welded to the pre-welding station, the control component adjusts the distance between the laser focus of the laser galvanometer and the surface to be welded according to the actual welding trajectory, and controls the laser galvanometer to weld at the position to be welded. Even if there are structural or dimensional deviations in the battery carrier, or deviations in the standard placement position of the battery to be welded relative to the battery carrier, the control component can adjust the distance between the laser focus of the laser galvanometer and the surface to be welded in real time when controlling the laser galvanometer to weld at the position to be welded, to compensate for the above-mentioned possible deviations, thereby ensuring the uniformity of laser energy at multiple welding positions, and thus facilitating improved welding results. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the first embodiment of the battery pre-welding system of the present invention;

[0022] Figure 2 This is a schematic diagram of the battery pre-welding system of the present invention when the battery carrier arrives at the pre-welding station;

[0023] Figure 3 This is a flowchart of the first embodiment of the battery pre-welding method of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure when a standard battery is transferred to the ranging station in the first embodiment of the battery pre-welding method of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the battery to be welded being transferred to the ranging station in the first embodiment of the battery pre-welding method of the present invention;

[0026] Figure 6 This is a schematic diagram of the second embodiment of the battery pre-welding system of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 110 - Transmission component; 110a - Ranging station; 110b - Pre-welding station; 111 - Battery carrier; 111a - Trigger unit; 112 - Transport device;

[0029] 120 - Distance measuring component; 121 - Distance measuring device; 1211 - Displacement sensor; 1212 - 3D image acquisition component; 1213 - Image processing component; 122 - First positioning detection component;

[0030] 130 - Pre-welded component; 131 - Laser galvanometer; 131' - Three-dimensional laser galvanometer; 132 - Second positioning detection component; 133 - Position coordinate acquisition component; 134 - Reciprocating drive device;

[0031] 140 - Control component; 141 - Data acquisition module; 142 - Calculation module; 143 - Flight welding control module; 144 - Compensation motion control module;

[0032] 200 - Battery to be soldered; 210 - Surface to be soldered;

[0033] 300 - Standard battery; 310 - Standard solderable surface;

[0034] BS - Preset reference plane;

[0035] X - First direction; Y - Second direction.

[0036] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0039] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0040] This invention provides a battery pre-soldering method. Figure 1 This is a schematic diagram of the structure of the first embodiment of the battery pre-welding system of the present invention. The battery pre-welding system is used to pre-weld the surface 210 of the battery 200 to be welded. In this embodiment, the battery pre-welding system includes a transmission component 110, a ranging component 120, a pre-welding component 130, and a control component 140.

[0041] The transfer assembly 110 includes a battery carrier 111 for carrying the battery 200 to be welded and a transport device 112 for moving the battery carrier 111 along a first direction X. The transfer assembly 110 has a ranging station 110a and a pre-welding station 110b arranged along the first direction X. Figure 1 This is a schematic diagram of the structure when the battery carrier 111 arrives at the ranging station 110a. The transport device 112 can be a linear transmission structure, a transport robot, etc. In some embodiments, the transport device 112 can drive the battery carrier 111 to be transported at a high speed of 300-400 mm / s along the first direction X.

[0042] The ranging component 120 is disposed at the ranging station 110a. The ranging component 120 includes a ranging device 121, which is used to acquire the actual distance information from multiple positions of the surface to be welded 210 in the first direction X to a preset reference plane BS. The preset reference plane BS is a plane perpendicular to the second direction Y, and the second direction Y is orthogonal to the first direction X.

[0043] Figure 2 This is a schematic diagram of the battery pre-welding system of the present invention when the battery carrier arrives at the pre-welding station, according to the first embodiment. The pre-welding assembly 130 is disposed at the pre-welding station 110b. The pre-welding assembly 130 includes a laser galvanometer 131, which is used to weld multiple positions of the surface to be welded 210.

[0044] The control component 140 is electrically connected to the ranging device 121 and the pre-welding component 130. The control component 140 is used to adjust the distance between the laser focus of the laser galvanometer 131 and the surface to be welded 210 according to the actual distance information when the laser galvanometer 131 is controlling the welding of the position to be welded.

[0045] According to an embodiment of the battery pre-welding system of the present invention, the transmission component 110 has a ranging station 110a and a pre-welding station 110b arranged along a first direction X. When the battery carrier 111 carries the battery 200 to be welded to the ranging station 110a, the ranging device 121 can acquire the actual distance information from multiple positions of the surface 210 to be welded in the first direction X to a preset reference surface. Subsequently, when the battery carrier 111 carries the battery 200 to be welded to the pre-welding station 110b, the control component 140 controls the laser galvanometer 131 to weld the positions to be welded, and the control component 140 adjusts the distance between the laser focus of the laser galvanometer 131 and the surface 210 to be welded according to the actual distance information. Even if the battery carrier 111 has structural or dimensional deviations, or if the battery 200 to be welded deviates from the standard placement position of the battery carrier 111, the control component 140 can adjust the distance between the laser focus of the laser galvanometer 131 and the surface to be welded 210 in real time when controlling the laser galvanometer 131 to weld the position to be welded, to compensate for the above-mentioned possible deviations, thereby ensuring the uniformity of laser energy for multiple welding positions, and thus facilitating the improvement of welding effect.

[0046] In some embodiments, the battery carrier 111 is provided with a triggering part 111a, and the ranging component 120 further includes a first positioning detection element 122. The first positioning detection element 122 is electrically connected to the control component 140. The transport device 112 transmits the battery carrier 111 to the first initial position of the ranging station 110a, causing the triggering part 111a to trigger the first positioning detection element 122. In this embodiment, the triggering part 111a is a baffle disposed on the battery carrier 111, for example, disposed at the front end of the battery carrier 111 along the first direction X. In this embodiment, the first positioning detection element 122 can be a photoelectric switch, such as a U-shaped photoelectric switch.

[0047] In some embodiments, the ranging device 121 includes a plurality of displacement sensors 1211, which are arranged along a first direction X on a preset reference plane BS. Figure 1 When the battery to be welded 200 is located at the ranging station 110a, multiple displacement sensors 1211 face the surface to be welded 210. Each displacement sensor 1211 can detect the actual distance information from the detection point on the surface to be welded 210 relative to the second direction Y to the preset reference plane BS.

[0048] In some embodiments, the battery carrier 111 is provided with a triggering part 111a, and the pre-welding assembly 130 further includes a second positioning detection element 132 and a position coordinate acquisition element 133. The second positioning detection element 132 and the position coordinate acquisition element 133 are electrically connected to the control assembly 140. The transport device 112 transmits the battery carrier 111 to the second initial position of the pre-welding station 110b, so that the triggering part 111a triggers the second positioning detection element 132, and the position coordinate acquisition element 133 can acquire the coordinate position of the battery carrier 111 relative to the second initial position along the first direction X. In this embodiment, the second positioning detection element 132 can be a photoelectric switch, such as a U-shaped photoelectric switch. In this embodiment, the position coordinate acquisition element 133 is, for example, a magnetic grating reader. After the triggering part 111a triggers the second positioning detection element 132, the magnetic grating reader can acquire the coordinate position of the battery carrier 111 relative to the second initial position along the first direction X according to the encoder position.

[0049] In some embodiments, the pre-welded assembly 130 further includes a reciprocating drive device 134, which is electrically connected to the control assembly 140. A laser galvanometer 131 is disposed on the reciprocating drive device 134, which drives the laser galvanometer 131 to move along the second direction Y. The reciprocating drive device 134 can be any known reciprocating drive device. In one example, the reciprocating drive device 134 includes a linear transmission member extending along the second direction Y and a drive motor, which drives the laser galvanometer 131 to move along the second direction Y via the linear transmission member.

[0050] In some embodiments, the control component 140 includes a data acquisition module 141, which is electrically connected to a plurality of displacement sensors 1211 and a first positioning detection element 122. The data acquisition module 141 is used to acquire actual distance information through the plurality of displacement sensors 1211. In some embodiments, the data acquisition module 141 is configured to periodically scan whether the first positioning detection element 122 is triggered, and when the triggering unit 111a triggers the first positioning detection element 122, it acquires the distance sensing data of the plurality of displacement sensors 1211 as the actual distance information.

[0051] In this embodiment, the data acquisition module 141 is, for example, a data acquisition card. The data acquisition card repeatedly scans the signal of the first positioning detection element 122 in the manner of a hardware clock. When the first positioning detection element 122 is triggered by the triggering unit 111a, it acquires the distance sensing data of multiple displacement sensors 1211 as the actual distance information. After sending the actual distance information outward, the data acquisition card re-enters the mode of repeatedly scanning the signal of the first positioning detection element 122.

[0052] In some embodiments, the control component 140 includes a calculation module 142, which is used to obtain an actual welding trajectory by fitting the actual distance information with a standard welding trajectory. In this embodiment, the calculation module 142 may be a computer.

[0053] In some embodiments, the control component 140 further includes a flight welding control module 143 and a compensation motion control module 144, which are electrically connected to the calculation module 142. The reciprocating drive device 134 is electrically connected to the compensation motion control module 144, and the flight welding control module 143 is electrically connected to the laser galvanometer 131.

[0054] In some embodiments, the calculation module 142 decomposes the actual welding trajectory according to the standard welding trajectory to obtain flight welding data and compensation data. The flight welding data includes the two-dimensional coordinate data of the laser focus corresponding to each welding position on the preset reference plane BS, and the compensation data includes the displacement deviation between the actual welding trajectory and the standard welding trajectory at each welding position in the second direction Y.

[0055] The flight welding control module 143 is used to control the laser galvanometer 131 to weld at the position to be welded based on the flight welding data. The flight welding control module 143 is, for example, a flight control card.

[0056] The compensation motion control module 144 is used to control the reciprocating drive device 134 to drive the laser galvanometer 131 to move along the second direction Y according to the compensation data. The compensation motion control module 144 is, for example, a motion control card.

[0057] This invention also provides a battery pre-welding method, which pre-welds the surface 210 of the battery 200 to be welded using the battery pre-welding system of any of the foregoing embodiments.

[0058] Figure 3 This is a flowchart of a first embodiment of the battery pre-soldering method of the present invention. The battery pre-soldering method of this embodiment uses the battery pre-soldering system of the first embodiment described above to pre-solder the solderable surface 210 of the battery 200 to be soldered. The battery pre-soldering method of this embodiment includes steps S110 to S150.

[0059] In step S110, the control transport device 112 transfers the battery carrier 111 carrying the battery to be welded 200 to the ranging station 110a.

[0060] In step S120, the actual distance information from multiple positions of the surface to be welded 210 in the first direction X to the preset reference surface BS is obtained by the ranging device 121.

[0061] In step S130, the control component 140 obtains the actual welding trajectory corresponding to the battery to be welded 200 based on the actual distance information.

[0062] In step S140, the control transport device 112 transfers the battery carrier 111 carrying the battery to be welded 200 to the pre-welding station 110b.

[0063] In step S150, the control component 140 adjusts the distance between the laser focus of the laser galvanometer 131 and the surface to be welded 210 according to the actual welding trajectory, and controls the laser galvanometer 131 to weld the position to be welded.

[0064] In some embodiments, the ranging device 121 includes a plurality of displacement sensors 1211, which are arranged along a first direction X on a preset reference surface BS. When the battery to be welded 200 is located at the ranging station 110a, the plurality of displacement sensors 1211 face the surface to be welded 210. Each displacement sensor 1211 can detect the actual distance information from the detection point on the surface to be welded 210 opposite to the preset reference surface BS along the second direction Y.

[0065] Step S120, which involves obtaining the actual distance information from multiple positions of the surface to be welded 210 in the first direction X to the preset reference plane BS via the ranging device 121, may include: detecting multiple actual distance information from multiple detection points on the surface to be welded 210 to the preset reference plane BS via multiple displacement sensors 1211, wherein each detection point is opposite to a corresponding displacement sensor 1211 along the second direction Y.

[0066] In some embodiments, the battery carrier 111 is provided with a triggering part 111a, and the ranging component 120 further includes a first positioning detection element 122. The first positioning detection element 122 is electrically connected to the control component 140. The transport device 112 transmits the battery carrier 111 to the first initial position of the ranging station 110a, causing the triggering part 111a to trigger the first positioning detection element 122. The control component 140 includes a data acquisition module 141, which is electrically connected to a plurality of displacement sensors 1211 and the first positioning detection element 122.

[0067] Step S120, which involves acquiring the actual distance information from multiple positions of the surface to be welded 210 in the first direction X to the preset reference plane BS via the ranging device 121, may include: the data acquisition module 141 periodically scanning whether the first positioning detection element 122 is triggered; and when the triggering unit 111a triggers the first positioning detection element 122, acquiring distance sensing data from multiple displacement sensors 1211 as the actual distance information.

[0068] In some embodiments, the control component 140 includes a calculation module 142. The step S130 of the control component 140 obtaining the actual welding trajectory corresponding to the battery to be welded 200 based on the actual distance information may include: the calculation module 142 fitting the actual distance information with the standard welding trajectory to obtain the actual welding trajectory.

[0069] In some embodiments, the control component 140 further includes a flight welding control module 143 and a compensation motion control module 144, which are electrically connected to the calculation module 142. The pre-welding component 130 further includes a reciprocating drive device 134, which is electrically connected to the compensation motion control module 144. A laser galvanometer 131 is disposed on the reciprocating drive device 134, which drives the laser galvanometer 131 to move along the second direction Y. The flight welding control module 143 is electrically connected to the laser galvanometer 131.

[0070] The step S150, in which the control component 140 adjusts the distance between the laser focus of the laser galvanometer 131 and the surface to be welded 210 according to the actual welding trajectory, and controls the laser galvanometer 131 to weld the position to be welded, may include: the calculation module 142 decomposing the actual welding trajectory according to the standard welding trajectory to obtain flying welding data and compensation data, wherein the flying welding data includes the two-dimensional coordinate data of the laser focus corresponding to each position to be welded on the preset reference plane BS, and the compensation data includes the displacement deviation between the actual welding trajectory and the standard welding trajectory at each position to be welded in the second direction Y; the flying welding control module 143 controls the laser galvanometer 131 to weld the position to be welded according to the flying welding data; and the compensation motion control module 144 controls the reciprocating drive device 134 to drive the laser galvanometer 131 to move along the second direction Y according to the compensation data.

[0071] In some embodiments, before step S110, in which the control transport device 112 transfers the battery carrier 111 carrying the battery to be welded 200 to the ranging station 110a, the battery pre-welding method further includes calibrating the ranging device 121 using a standard battery.

[0072] Figure 4 This is a schematic diagram of the structure when a standard battery is transferred to the ranging station in the first embodiment of the battery pre-welding method of the present invention. Taking the first positioning detection element 122 as the coordinate reference point along the first direction X, the distances from multiple displacement sensors 1211 to the first positioning detection element 122 along the first direction X are measured and used as the detection coordinates of each displacement sensor 1211. In this embodiment, taking the ranging device 121 including four displacement sensors 1211 as an example, the four detection coordinates X1base, X2base, X3base, and X4base corresponding to the four displacement sensors 1211 can be obtained respectively.

[0073] The transport device 112 transports the battery carrier 111 carrying the standard battery 300 to the first initial position of the ranging station 110a. When the triggering unit 111a triggers the first positioning detection element 122, multiple displacement sensors 1211 detect multiple standard distance information from multiple detection points on the standard welding surface 310 of the standard battery 300 to the preset reference plane BS. Each detection point is opposite to a corresponding displacement sensor 1211 along the second direction Y. In this embodiment, four displacement sensors 1211 collect four corresponding standard distance information Y1base, Y2base, Y3base, and Y4base. At the same time, the laser focal axis coordinate Yweild of the welding position on the standard welding surface 310 along the second direction Y is obtained.

[0074] Figure 5 This is a schematic diagram of the structure of the battery to be welded being transferred to the ranging station in the first embodiment of the battery pre-welding method of the present invention. The transport device 112 transfers the battery carrier 111 carrying the battery to be welded 200 to the first initial position of the ranging station 110a. When the triggering unit 111a triggers the first positioning detection element 122, multiple displacement sensors 1211 detect multiple actual distance information from multiple detection points on the surface 210 to be welded of the battery 200 to the preset reference plane BS. Each detection point is opposite to a corresponding displacement sensor 1211 along the second direction Y. In this embodiment, four displacement sensors 1211 collect four corresponding actual distance information Y1, Y2, Y3, and Y4.

[0075] At this point, at least some compensation data can be obtained. In the compensation data, the displacement deviations at the positions of the four displacement sensors 1211 are calculated as (Y1-Y1base), (Y2-Y2base), (Y3-Y3base), and (Y4-Y4base).

[0076] Subsequently, the transport device 112 transfers the battery carrier 111 carrying the battery to be welded 200 to the second initial position of the pre-welding station 110b, so that when the triggering part 111a triggers the second positioning detection element 132, the compensation motion control module 144 controls the reciprocating drive device 134 to drive the laser galvanometer 131 to move along the second direction Y according to the compensation data. For example, when the coordinate acquisition unit 133 acquires the coordinates of the battery carrier 111 traveling along the first direction X to X1base, the laser focus along the second direction Y is adjusted in real time to (Yweild + Y1 - Y1base); when the coordinate acquisition unit 133 acquires the coordinates of the battery carrier 111 traveling along the first direction X to X2base, the laser focus along the second direction Y is adjusted in real time to (Yweild + Y2 - Y2base); when the coordinate acquisition unit 133 acquires the coordinates of the battery carrier 111 traveling along the first direction X to X3base, the laser focus along the second direction Y is adjusted in real time to (Yweild + Y3 - Y3base); when the coordinate acquisition unit 133 acquires the coordinates of the battery carrier 111 traveling along the first direction X to X4base, the laser focus along the second direction Y is adjusted in real time to (Yweild + Y4 - Y4base).

[0077] According to the battery pre-welding method of the present invention, the control transport device 112 transports the battery carrier 111 carrying the battery 200 to be welded to the ranging station 110a, and the ranging device 121 acquires the actual distance information from multiple positions of the surface 210 to be welded in the first direction X to the preset reference plane BS. After acquiring the actual distance information, the control component 140 acquires the actual welding trajectory corresponding to the battery 200 to be welded based on the actual distance information. After the control transport device 112 transports the battery carrier 111 carrying the battery 200 to be welded to the pre-welding station 110b, the control component 140 adjusts the distance between the laser focus of the laser galvanometer 131 and the surface 210 to be welded according to the actual welding trajectory, and controls the laser galvanometer 131 to weld at the position to be welded. Even if the battery carrier 111 has structural or dimensional deviations, or if the battery 200 to be welded deviates from the standard placement position of the battery carrier 111, the control component 140 can adjust the distance between the laser focus of the laser galvanometer 131 and the surface to be welded in real time when controlling the laser galvanometer 131 to weld the position to be welded, to compensate for the above-mentioned possible deviations, thereby ensuring the uniformity of laser energy for multiple welding positions, and thus facilitating the improvement of welding effect.

[0078] Figure 6 This is a schematic diagram of the structure of a second embodiment of the battery pre-soldering system of the present invention. The battery pre-soldering system includes a transmission component 110, a ranging component 120, a pre-soldering component 130, and a control component 140. Some parts of the structure of the battery pre-soldering system in the second embodiment are the same as those in the first embodiment. The differences between the two will be described below, while the similarities will not be described in detail.

[0079] In the second embodiment, the ranging device 121 includes a three-dimensional image acquisition unit 1212 and an image processing unit 1213. The three-dimensional image acquisition unit 1212 is used to acquire images of the relative positions of the surface to be welded 210 and a preset reference surface BS. The image processing unit 1213 is electrically connected to the image acquisition unit and the control component 140, and obtains the actual distance information of multiple positions of the surface to be welded 210 along the first direction X to the preset reference surface BS based on the images.

[0080] In the first embodiment described above, the laser galvanometer 131 is a two-dimensional laser galvanometer. Through the two-dimensional laser galvanometer and the Y-axis compensation of the motion compensation control module 144, Y-axis compensation can be adapted to various deviation conditions ranging from small to large.

[0081] In the second embodiment, the laser galvanometer is a three-dimensional laser galvanometer 131', and the pre-welding assembly 130 may not include the reciprocating drive device 134. The control assembly 140 can obtain the actual welding trajectory corresponding to the battery 200 to be welded based on the actual distance information, and obtain the three-dimensional coordinates of the laser focus corresponding to each position to be welded based on the actual welding trajectory. The three-dimensional coordinates of the laser focus are used to control the three-dimensional laser galvanometer 131' to weld the position to be welded.

[0082] Of course, in some other embodiments, when using the three-dimensional laser galvanometer 131' as the laser galvanometer, the compensation motion control module 144 and the reciprocating drive device 134 can be selectively retained. In this way, the Y-axis compensation of the three-dimensional laser galvanometer 131' and the compensation motion control module 144 can be combined. When the error between the battery to be welded 200 and the standard battery 300 is within a relatively small range, the Y-axis compensation can be directly performed through the internal action of the three-dimensional laser galvanometer 131'. When the error is within a large range, the compensation motion control module 144 and the reciprocating drive device 134 can be used for Y-axis compensation, making the Y-axis compensation method more flexible.

[0083] In conjunction with the battery pre-soldering system of the second embodiment described above, the present invention provides a battery pre-soldering method of the second embodiment. The differences between the battery pre-soldering method of the second embodiment and the battery pre-soldering method of the first embodiment will be described below, while the similarities will not be described in detail.

[0084] Since the ranging device 121 includes a three-dimensional image acquisition unit 1212 and an image processing unit 1213, the step of obtaining the actual distance information of multiple positions of the surface to be welded 210 in the first direction X to the preset reference surface BS through the ranging device 121 may include: obtaining an image of the relative position of the surface to be welded 210 and the preset reference surface BS through the three-dimensional image acquisition unit 1212; and obtaining the actual distance information of multiple positions of the surface to be welded 210 in the first direction X to the preset reference surface BS based on the image.

[0085] Since the laser galvanometer is a three-dimensional laser galvanometer 131', the control component 140 can adjust the distance between the laser focus of the laser galvanometer and the surface to be welded 210 according to the actual welding trajectory, and control the laser galvanometer to weld the position to be welded. This step may include: the control component 140 obtains the three-dimensional coordinates of the laser focus corresponding to each position to be welded according to the actual welding trajectory; and controls the three-dimensional laser galvanometer 131' to weld the position to be welded by the three-dimensional coordinates of the laser focus.

[0086] According to the battery pre-welding method of the present invention, the control transport device 112 transmits the battery carrier 111 carrying the battery 200 to be welded to the ranging station 110a, and the ranging device 121 acquires the actual distance information from multiple positions of the surface 210 to be welded in the first direction X to the preset reference plane BS. After acquiring the actual distance information, the control component 140 acquires the actual welding trajectory corresponding to the battery 200 to be welded based on the actual distance information. After the control transport device 112 transmits the battery carrier 111 carrying the battery 200 to be welded to the pre-welding station 110b, the control component 140 adjusts the distance between the laser focus of the laser galvanometer and the surface 210 to be welded according to the actual welding trajectory, and controls the laser galvanometer to weld at the position to be welded. Even if the battery carrier 111 has structural or dimensional deviations, or if the battery 200 to be welded deviates from the standard placement position of the battery carrier 111, the control component 140 can adjust the distance between the laser focus of the laser galvanometer and the surface to be welded in real time when controlling the laser galvanometer to weld the position to be welded, to compensate for the above-mentioned possible deviations, thereby ensuring the uniformity of laser energy for multiple welding positions, thus facilitating the improvement of welding effect.

[0087] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A battery pre-welding system for pre-welding the surfaces of a battery to be welded, characterized in that, The battery pre-welding system includes: The transmission assembly includes a battery carrier for carrying the battery to be welded and a transport device for moving the battery carrier along a first direction. The transmission assembly has a ranging station and a pre-welding station arranged along the first direction. The battery carrier is provided with a triggering part. A ranging component is disposed at the ranging station. The ranging component includes a ranging device and a first positioning detection element. The ranging device includes multiple displacement sensors arranged along a first direction on a preset reference surface. The ranging device is used to acquire the actual distance information from multiple positions of the surface to be welded in the first direction to the preset reference surface. The preset reference surface is a surface perpendicular to a second direction, which is orthogonal to the first direction. When the battery to be welded is located at the ranging station, the multiple displacement sensors face the surface to be welded. Each displacement sensor is used to detect the actual distance information from a detection point on the surface to be welded relative to the second direction to the preset reference surface. When the transport device transmits the battery carrier to the first initial position of the ranging station, the triggering unit triggers the first positioning detection element. A pre-welding assembly is provided at the pre-welding station. The pre-welding assembly includes a laser galvanometer, which is used to weld multiple positions on the surface to be welded. A control component is electrically connected to the ranging device, the first positioning detection element, and the pre-welding component. The control component is used to adjust the distance between the laser focus of the laser galvanometer and the surface to be welded according to the actual distance information when controlling the laser galvanometer to weld the position to be welded. The control component includes a data acquisition module and a calculation module. The data acquisition module is electrically connected to the plurality of displacement sensors and the first positioning detection element. The calculation module is used to fit the actual distance information with the standard welding trajectory to obtain the actual welding trajectory, and to decompose the actual welding trajectory according to the standard welding trajectory to obtain flight welding data and compensation data. The control components also include a flight welding control module and a compensation motion control module, which are electrically connected to the computing module. The pre-welded assembly also includes a reciprocating drive device, which is electrically connected to the compensation motion control module. The laser galvanometer is disposed on the reciprocating drive device, and the reciprocating drive device is used to drive the laser galvanometer to move along the second direction. The flight welding control module is electrically connected to the laser galvanometer. The flight welding control module is used to control the laser galvanometer to weld the position to be welded according to the flight welding data. The compensation motion control module is used to control the reciprocating drive device to drive the laser galvanometer to move along the second direction according to the compensation data. The data acquisition module is used to periodically scan whether the first positioning detection element is triggered, and when the first positioning detection element is triggered by the triggering part, it acquires the distance sensing data of the multiple displacement sensors as the actual distance information; The flight welding data includes two-dimensional coordinate data of the laser focus corresponding to each welding position on the preset reference plane, and the compensation data includes the displacement deviation between the actual welding trajectory and the standard welding trajectory at each welding position in the second direction.

2. The battery pre-welding system as described in claim 1, characterized in that, The ranging device includes a three-dimensional image acquisition unit and an image processing unit. The three-dimensional image acquisition unit is used to acquire an image of the relative position of the surface to be welded and the preset reference surface. The image processing unit is electrically connected to the image acquisition unit and the control component. The image processing unit obtains the actual distance information of multiple positions of the surface to be welded along the first direction to the preset reference surface based on the image.

3. The battery pre-welding system as described in claim 1, characterized in that, The pre-welding assembly further includes a second positioning detection element and a position coordinate acquisition element. The second positioning detection element and the position coordinate acquisition element are electrically connected to the control component. The transport device transmits the battery carrier to the second initial position of the pre-welding station, so that the triggering part triggers the second positioning detection element. The position coordinate acquisition element can acquire the coordinate position of the battery carrier relative to the second initial position along the first direction.

4. The battery pre-welding system as described in claim 1, characterized in that, The laser galvanometer is a three-dimensional laser galvanometer. The control component can obtain the actual welding trajectory corresponding to the battery to be welded based on the actual distance information, and obtain the three-dimensional coordinates of the laser focus corresponding to each position to be welded based on the actual welding trajectory. The three-dimensional coordinates of the laser focus are used to control the three-dimensional laser galvanometer to weld the position to be welded.

5. A battery pre-welding method, characterized in that, The battery pre-welding method pre-welds the surface of the battery to be welded using the battery pre-welding system as described in claim 1, and the battery pre-welding method includes: The transport device is controlled to transfer the battery carrier carrying the battery to be welded to the ranging station; The distance measuring device acquires the actual distance information from multiple positions of the surface to be welded in the first direction to the preset reference surface. The control component obtains the actual welding trajectory corresponding to the battery to be welded based on the actual distance information. The transport device is controlled to transfer the battery carrier carrying the battery to be welded to the pre-welding station; The control component adjusts the distance between the laser focus of the laser galvanometer and the surface to be welded according to the actual welding trajectory, and controls the laser galvanometer to weld the position to be welded.

6. The battery pre-welding method as described in claim 5, characterized in that, The ranging device includes multiple displacement sensors arranged along the first direction on the preset reference surface. When the battery to be welded is located at the ranging station, the multiple displacement sensors face the surface to be welded. Each displacement sensor can detect the actual distance information from a detection point on the surface to be welded, which is opposite to the preset reference surface along the second direction. The step of obtaining the actual distance information from multiple positions of the surface to be welded in the first direction to the preset reference surface through the ranging device includes: The multiple displacement sensors detect multiple actual distance information from multiple detection points on the surface to be welded to the preset reference surface, with each detection point corresponding to one displacement sensor along the second direction.

7. The battery pre-welding method as described in claim 6, characterized in that, The battery carrier is equipped with a triggering unit, and the ranging component includes a first positioning detection element, which is electrically connected to the control component. The transport device transmits the battery carrier to the first initial position of the ranging station, causing the triggering unit to activate the first positioning detection element. The control component includes a data acquisition module, which is electrically connected to the plurality of displacement sensors and the first positioning detection element. The step of obtaining the actual distance information from multiple positions of the surface to be welded in the first direction to the preset reference surface through the ranging device includes: The data acquisition module periodically scans whether the first positioning detection element has been triggered. When the triggering unit triggers the first positioning detection element, distance sensing data from the plurality of displacement sensors is collected as the actual distance information.

8. The battery pre-welding method as described in claim 6, characterized in that, The control component obtains the actual welding trajectory corresponding to the battery to be welded based on the actual distance information, including: The calculation module obtains the actual welding trajectory by fitting the actual distance information with the standard welding trajectory.

9. The battery pre-welding method as described in claim 8, characterized in that, The control component adjusts the distance between the laser focus of the laser galvanometer and the surface to be welded according to the actual welding trajectory, and controls the laser galvanometer to weld the position to be welded, including: The calculation module decomposes the actual welding trajectory according to the standard welding trajectory to obtain flight welding data and compensation data. The flight welding data includes the two-dimensional coordinate data of the laser focus corresponding to each welding position on the preset reference plane. The compensation data includes the displacement deviation between the actual welding trajectory and the standard welding trajectory at each welding position in the second direction. The flight welding control module controls the laser galvanometer to weld the position to be welded based on the flight welding data; The compensation motion control module controls the reciprocating drive device to drive the laser galvanometer to move along the second direction based on the compensation data.

10. The battery pre-welding method as described in claim 5, characterized in that, The ranging device includes a three-dimensional image acquisition unit and an image processing unit. The step of acquiring the actual distance information from multiple positions of the surface to be welded in the first direction to the preset reference surface via the ranging device includes: The three-dimensional image acquisition device acquires an image of the relative position between the surface to be welded and the preset reference surface; The image processing unit obtains the actual distance information from multiple positions of the surface to be welded along the first direction to the preset reference surface based on the image.

11. The battery pre-welding method as described in claim 10, characterized in that, The laser galvanometer is a three-dimensional laser galvanometer. The control component adjusts the distance between the laser focus of the laser galvanometer and the surface to be welded according to the actual welding trajectory, and controls the laser galvanometer to weld the position to be welded, including: The control component obtains the three-dimensional coordinates of the laser focus corresponding to each of the welding positions based on the actual welding trajectory. The three-dimensional laser galvanometer is controlled by the three-dimensional coordinates of the laser focus to weld the position to be welded.

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