Battery welding device, battery and control system

Abstract

The embodiment of the invention provides a battery welding device, and relates to the technical field of batteries. The fixing assembly is used for limiting the battery on the supporting assembly and driving the battery to rotate; the visual sensor is used for shooting the end face of the battery and outputting a compensation signal according to the end face of the battery; and then the supporting assembly responds to the compensation signal to conduct height adjustment, so that the laser gun head is used for welding the shell and the top cover of the battery after the height adjustment of the supporting assembly is conducted. According to the method, the height compensation process is guided through vision, so that the battery welding focus is kept on the same point, the state consistency of a molten pool can be effectively controlled, the out-of-focus amount fluctuation caused by circle run-out is avoided, the abnormities such as pseudo soldering and weld penetration are avoided, the welding quality is improved, and the safety risk is reduced.

Description

Technical Field

[0001] This specification relates to the technical field of batteries. Specifically, it relates to battery welding technology in the technical field of batteries. More specifically, it relates to a battery welding device, a battery, and a control system. Background Art

[0002] With the development of new energy technology, the requirement for the stability of batteries is getting higher and higher, and the welding process of batteries is particularly critical for stability.

[0003] During the welding process of cylindrical batteries, the roundness of the cylindrical batteries will change after the covers are closed. A large circular runout during rotation will cause a change in the defocus amount, ultimately leading to an unstable molten pool, resulting in defects such as pores, insufficient soldering, and poor airtightness in the weld seam. Such defects pose a risk of liquid leakage during subsequent use, and the batteries cannot meet the safety requirements after long-term use, affecting the stability and safety of the batteries. Summary of the Invention

[0004] The embodiments of this specification provide a battery welding device and a battery to achieve a highly dynamically adjustable welding process and improve the reliability of the welded battery.

[0005] To achieve the above technical objectives, the embodiments of this specification provide the following technical solutions:

[0006] In a first aspect, an embodiment of this specification provides a battery welding device, including:

[0007] A support assembly, a fixing assembly, a vision sensor, and a laser gun head;

[0008] Among them, the support assembly is used to hold the battery; the fixing assembly is used to restrict the battery on the support assembly and drive the battery to rotate; the vision sensor is used to photograph the end face of the battery and output a compensation signal according to the end face of the battery; the support assembly adjusts its height in response to the compensation signal; the laser gun head is used to weld the housing and the top cover of the battery after the support assembly adjusts its height.

[0009] Optionally, in a possible implementation, the support assembly includes:

[0010] A power driving mechanism, a telescopic rod, a support base, and a lifting wheel;

[0011] The power driving mechanism is connected to the first end of the telescopic rod, the second end of the telescopic rod is connected to the bottom of the support base, and the lifting wheel is arranged on the support base;

[0012] The lifting wheel is used to support the rotation of the battery, and the power driving mechanism is used to drive the telescopic rod to adjust the height in response to the compensation signal.

[0013] Optionally, in a possible implementation manner, the device further includes:

[0014] A plurality of slide rails;

[0015] The support base is configured with limit holes having the same number as the slide rails, and the aperture of the limit holes corresponds to the diameter of the slide rails;

[0016] The slide rails are slidably connected to the support base based on the limit holes.

[0017] Optionally, in a possible implementation manner, the device further includes:

[0018] A plurality of sliding grooves;

[0019] The number of the sliding grooves corresponds to the lifting wheels, and the lifting wheels slide along the groove bodies of the sliding grooves.

[0020] Optionally, in a possible implementation manner, the device further includes:

[0021] A first bracket;

[0022] The first bracket includes a first arm, a bracket base, and a second arm. The first arm and the second arm stand at both ends of the bracket base;

[0023] One end of the first arm is movably connected to the laser gun head, the other end of the first arm is connected to the bracket base, and the visual sensor is configured on the first arm;

[0024] The support assembly is configured on the bracket base;

[0025] One end of the second arm is configured with the fixing assembly so that the fixing assembly is located above the support assembly, and the other end of the second arm is connected to the bracket base.

[0026] Optionally, in a possible implementation manner, the device further includes:

[0027] A first distance measuring component;

[0028] The first distance measuring component is configured on the side of the laser gun head. The first distance measuring component is used to measure the position change of any point on the end face arc of the battery and generate a point displacement signal; and / or

[0029] The device includes:

[0030] Second ranging component;

[0031] The second ranging component is disposed on the side of the laser gun head, and the second ranging component is used to measure the height change of the support component and generate a height change signal.

[0032] Optionally, in a possible implementation manner, the device further includes:

[0033] Discharge component;

[0034] The discharge component screens the battery in response to a control instruction output by a control algorithm, and the control algorithm is configured based on at least one of the compensation signal, the point displacement signal, and the height change signal.

[0035] Optionally, in a possible implementation manner, the device further includes:

[0036] Second bracket, first receiving groove, discharge push rod, conveyor belt, and second receiving groove;

[0037] One end of the second bracket is configured with the discharge push rod, the first receiving groove is supported by the second bracket, one end of the conveyor belt is docked with the first receiving groove, and the other end of the conveyor belt is docked with the second receiving groove;

[0038] The discharge push rod is used to push the battery transferred by the discharge component from the first receiving groove into the conveyor belt, the conveyor belt is used to transport the battery to the second receiving groove, and the second receiving groove is used to recycle the battery.

[0039] In a second aspect, an embodiment of the present specification provides a battery screening method, including:

[0040] Obtain detection information corresponding to a battery welding task, where the detection information includes at least one of a compensation signal, a point displacement signal, and a height change signal. The compensation signal is determined by a vision sensor through roundness detection of the end face of the battery, the point displacement signal is determined by a first ranging component through measuring the position change of any point on the end face arc of the battery, and the height change signal is determined by a second ranging component through measuring the height change of the support component;

[0041] Output characteristic parameters based on the detection information;

[0042] Control the discharge component to screen the battery according to the characteristic parameters.

[0043] In a third aspect, an embodiment of this specification further provides a computing device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the battery screening method described above is implemented.

[0044] In a fourth aspect, an embodiment of this specification further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the battery screening method described above is implemented.

[0045] In a fifth aspect, an embodiment of this specification provides a computer program product or a computer program. The computer program product includes a computer program, which can be stored in a computer-readable storage medium or in the cloud. The processor of the computer device reads the computer program, and when the processor executes the computer program, the steps of the above-mentioned battery screening method are implemented.

[0046] As can be seen from the above technical solutions, the battery welding device provided by the embodiment of this specification uses a support assembly to hold the battery; a fixing assembly is used to limit the battery on the support assembly and drive the battery to rotate; and a vision sensor is used to capture the end face of the battery and output a compensation signal according to the end face of the battery. Furthermore, the support assembly responds to the compensation signal to adjust its height, so that the laser gun head is used to weld the battery case and the top cover after the height of the support assembly is adjusted. Through the process of vision-guided height compensation, the welding focus of the battery is kept at the same point, which can effectively control the consistency of the molten pool state, avoid the defocus amount fluctuation caused by circular runout, avoid abnormalities such as virtual welding and welding through, improve the welding quality, and reduce the safety risk. Description of the Drawings

[0047] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of this specification. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0048] Figure 1 Schematic structural diagram of a battery welding device provided for an embodiment of this specification;

[0049] Figure 2 Schematic structural diagram of another battery welding device provided for an embodiment of this specification;

[0050] Figure 3 Schematic structural diagram of another battery welding device provided for an embodiment of this specification;

[0051] Figure 4 Schematic structural diagram of another battery welding device provided for an embodiment of this specification;

[0052] Figure 5 Schematic flow diagram of a battery screening method provided for an embodiment of this specification;

[0053] Figure 6 Schematic scenario diagram of a battery screening method provided for an embodiment of this specification;

[0054] Figure 7 Schematic scenario diagram of a battery screening method provided for an embodiment of this specification;

[0055] Figure 8 Schematic scenario diagram of a battery screening method provided for an embodiment of this specification;

[0056] Figure 9 Schematic structural diagram of a battery screening device provided for an embodiment of this specification;

[0057] Figure 10 Schematic structural diagram of a computing device provided for an embodiment of this specification.

[0058] In the above-mentioned drawings, the following reference numerals are included: support assembly 101, fixing assembly 102, vision sensor 103, and laser gun head 104; power driving mechanism 1011, telescopic rod 1012, support base 1013, and lifting wheel 1014; slide rail 1015, limit hole 1016; first bracket 105, first arm 1051, bracket base 1052, and second arm 1053; first ranging assembly 201; second ranging assembly 202; discharging assembly 301; second bracket 302, first receiving groove 303, discharging push rod 304, conveyor belt 305, and second receiving groove 306. Detailed implementation manners

[0059] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this specification should have the ordinary meanings understood by those of ordinary skill in the field to which this specification belongs. The "first", "second", and similar terms used in the embodiments of this specification do not denote any order, quantity, or importance, but are only used to avoid confusion of components.

[0060] Unless otherwise required by the context, throughout the specification, "a plurality of" means "at least two", and "comprising" is construed in an open, inclusive sense, that is, "including, but not limited to". In the description of the specification, terms such as "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" are intended to indicate that specific features, structures, materials, or characteristics related to the embodiment or example are included in at least one embodiment or example of the present specification. The schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0061] Next, the technical solutions in the embodiments of the present specification will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present specification. Obviously, the described embodiments are only a part of the embodiments of the present specification, rather than all the embodiments. Based on the embodiments in the present specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present specification.

[0062] With the development of new energy technologies, the requirements for the stability of batteries are getting higher and higher, and the welding process of batteries is particularly crucial for stability.

[0063] During the welding process of cylindrical batteries, the roundness of the cylindrical battery will change after the cover is closed, and large circular runout during rotation will cause the defocus amount to change, ultimately resulting in unstable molten pools, and defects such as pores, false soldering, and poor airtightness in the weld seam. Such defects pose a risk of liquid leakage during subsequent use, and the battery cannot meet the safety requirements after long-term use, affecting the stability and safety of the battery.

[0064] To solve the above problems, the embodiments of the present specification provide a battery welding device. Next, the battery welding device provided by the embodiments of the present specification will be described exemplarily in conjunction with the accompanying drawings.

[0065] As Figure 2 shown, Figure 2 is a schematic flow diagram of a battery welding device provided by an embodiment of the present specification; the battery welding device includes:

[0066] a support assembly 101, a fixing assembly 102, a vision sensor 103, and a laser gun head 104;

[0067] Specifically, the support assembly 101 is used to receive the battery, that is, after the battery is loaded, it is placed on the support assembly 101, and the height of the battery can be controlled to change by changing the height of the support assembly 101.

[0068] The fixing component 102 is used to limit the battery above the supporting component 101 and drive the battery to rotate. Among them, the fixing component 102 needs to drive the battery to rotate around its axis, that is, the fixing component 102 has rolling friction on the battery surface. In addition, considering that the battery needs to be allowed to rotate, it can be seen that the battery in this embodiment is a cylindrical battery.

[0069] Specifically, the fixing component can be a pressing wheel or a track belt and other components with a pressing function. Considering that the battery rotates during the fixing process, a motor can be configured to drive the pressing wheel or the track belt to rotate. In addition, in order to buffer during pressing, avoid direct pressing from causing battery damage, and adapt to the process of adjusting the battery height, a spring can be configured for the fixing component. At this time, it can be called a spring-driven pressing wheel or a spring-driven track belt, or it can also be other spring-driven components with a pressing function.

[0070] In addition, the vision sensor 103 is used to photograph the end face of the battery and output a compensation signal after analyzing the image of the end face of the photographed battery. Among them, the vision sensor 103 is a vision sensor for image analysis, which mainly realizes target recognition, feature extraction and data analysis through optical signal capture and processing. The specific forms can include: global / rolling shutter CMOS / CCD sensors (capturing static or dynamic images with high resolution, suitable for industrial inspection and motion tracking), high dynamic range (HDR) sensors (enhancing the detail restoration of bright and dark contrast scenes, such as autonomous driving environment perception), multi-spectral / hyperspectral sensors (capturing specific band information outside the visible light for agriculture, remote sensing or material analysis), event cameras (based on asynchronous pixel response, only recording changes in light intensity, good at processing high-speed dynamic scenes), and embedded AI vision modules (integrating algorithm hardware acceleration to complete target detection or classification in real time).

[0071] In a possible scenario, the vision sensor 103 is a CCD camera, which is connected to a visual graphics screen. The shooting accuracy of the CCD camera is 0.01 mm, and the visual graphics screen displays the roundness curve simulated during the roundness-rotation process.

[0072] Therefore, by photographing the end face of the battery through the above vision sensor, generating roundness data, simulating it into a curve with the battery rotation speed as the abscissa, and sending it to the processor PLC, the supporting component 101 is controlled to move up and down according to the simulated curve to compensate for the height difference.

[0073] It can be understood that the process of outputting the compensation signal according to the end face of the battery can be executed by a processor. The processor can be integrated in the camera or a specific configured processing terminal, which is not limited here.

[0074] Through the above process of outputting a compensation signal based on the end face of the battery, the support assembly 101 adjusts its height in response to the compensation signal, and then the laser gun head 104 is used to weld the battery case and the top cover after the support assembly 101 adjusts its height.

[0075] In a possible scenario, the support assembly 101 is as Figure 1 shown, and specifically includes:

[0076] A power drive mechanism 1011, a telescopic rod 1012, a support base 1013, and a lifting wheel 1014;

[0077] Among them, the power drive mechanism 1011 can be a servo motor or other power mechanisms with drive functions. In the following embodiments, the servo motor 1011 is taken as an example for illustration.

[0078] The servo motor 1011 is connected to the first end of the telescopic rod 1012, the second end of the telescopic rod 1012 is connected to the bottom of the support base 1013, and the lifting wheel 1014 is arranged on the support base 1013;

[0079] Specifically, the lifting wheel 1014 is used to support the rotation process of the battery, and the servo motor 1011 is used to drive the telescopic rod 1012 to adjust its height in response to the compensation signal. For example, the center position at the bottom of the telescopic rod 1012 is connected to a servo motor or a drive cylinder to control the up and down displacement of the support base 1013. Preferably, a servo motor with a displacement accuracy of 0.01 mm is used for control.

[0080] Therefore, after the battery is loaded onto the lifting wheel 1014, the spring-driven pressure wheel presses down to position the battery. Due to the configuration of the spring, the spring-driven pressure wheel can adapt to the height adjustment process of the support base to achieve the process of dynamic positioning. That is, during the sealing welding process of the cylindrical battery, the battery is mainly supported by four lifting wheels 1014. The battery case adds a spring-driven pressure wheel to drive the battery to rotate. The laser gun head 104 is located above, and light is emitted at the joint of the battery case and the top cover for welding. During the welding process, the positions of the laser gun head 104 and the bottom lifting wheel 1014 of the battery are both fixed.

[0081] In another possible scenario, in order to avoid the welding position deviation caused by the lateral displacement of the support base 1013 and thus deteriorate the welding quality, lateral limiting can be performed. Specifically, as Figure 2 shown, Figure 2 is a schematic structural diagram of another battery welding device provided for an embodiment of this specification; that is, the support assembly 101 further includes:

[0082] Multiple slide rails 1015;

[0083] Specifically, the support base 1013 is configured with the same number of limiting holes 1016 as the number of slide rails 1015. The aperture diameter of the limiting holes 1016 corresponds to the diameter of the slide rails 1015; and the slide rails 1015 are slidably connected to the support base 1013 based on the limiting holes 1016. That is, the slide rails 1015 are connected around the support base 1013, and the slide rails 1015 are perpendicular to the welding plane tangent to the battery housing where the welding points are located, with an accuracy of 90 ± 0.1°, ensuring that there is no horizontal offset during the up and down displacement of the support base 1013.

[0084] In another possible scenario, to adapt to batteries of different diameters, the support assembly 101 further includes:

[0085] A plurality of sliding grooves;

[0086] Specifically, the number of sliding grooves corresponds to the lifting wheels 1014. The sliding grooves are used to support the lifting wheels 1014 for lateral sliding, that is, the distance between the two lifting wheels 1014 arranged radially for the battery can be adjusted, so as to adapt to the use of various different specifications of batteries. After adjusting the distance, the position of the lifting wheels 1014 can be fixed by fasteners. For ease of operation, the two lifting wheels 1014 on the same side of the battery central axis can be connected to achieve synchronous sliding, and / or linkage can be achieved between the two lifting wheels 1014 arranged radially for the battery, ensuring that the battery is always supported at the middle position of the support base 1013. Among them, the stroke of the sliding groove needs to be between one-third and one-half of the battery diameter, that is, less than one-half and greater than one-third, so as to achieve stable fixation of the battery, that is, the distance between the two lifting wheels 1014 arranged radially for the battery is less than the battery diameter and greater than two-thirds of the battery diameter.

[0087] Optionally, the lifting wheels 1014 can be made of polyether ether ketone (PEEK) material, which has the characteristics of wear resistance and can avoid rolling friction. Combining the relationship between the set distance of the two lifting wheels 1014 and the overall diameter of the cylinder, the stability and consistency of the battery during the welding process can be improved.

[0088] Furthermore, in order to avoid detection errors caused by errors in compensation signals, this embodiment is also configured with a ranging system for calibrating the height adjustment process. The specific structure is as Figure 3 shown, Figure 3 is a schematic structural diagram of another battery welding device provided for an embodiment of this specification; that is, the battery welding device can further include:

[0089] The first ranging component 201;

[0090] The first ranging component 201 is configured on the side of the laser gun head 104. The first ranging component 201 is used to measure the position change of any point on the end face arc of the battery and generate a point displacement signal.

[0091] In addition, the battery welding device may further include:

[0092] A second ranging component 202;

[0093] The second ranging component 202 is disposed on the side of the laser gun head 104. The second ranging component 202 is used to measure the height change of the support component 101 and generate a height change signal.

[0094] It can be understood that the first ranging component 201 and the second ranging component 202 can be configured simultaneously or alternatively; they can be configured on the same side of the laser gun head 104 or on different sides of the laser gun head 104, which is not limited herein.

[0095] The specific forms of the above-mentioned first ranging component 201 and second ranging component 202 may include: ultrasonic, infrared, lidar, millimeter-wave radar, ToF camera, proximity sensor, encoder, capacitive, inductive.

[0096] Specifically, in the welding scenario, there may be interference from high temperature, smoke and strong light. Therefore, the ranging component needs to have strong anti-interference ability. Therefore, the preferred ranging component usually needs to have high precision (millimeter level), anti-strong light / smoke interference, fast response and high temperature resistance characteristics. For example, models using short-wave infrared (SWIR) laser or phase-type ToF technology can work stably in the welding strong light and splash environment, detect the weld position, workpiece deformation or the distance of the welding head in real time, and adjust the welding path through high-speed feedback.

[0097] For example, a laser rangefinder is installed on the same side of the laser gun head 104 to monitor the position change of a certain fixed point of the battery during the actual welding process and generate a signal curve. That is, the welding process detection is composed of the laser gun head 104, laser rangefinder 1, and laser rangefinder 2. The laser rangefinders are installed on both sides of the laser gun head 104. Laser rangefinder 1 detects the displacement of a certain fixed point of the battery before welding, and laser rangefinder 2 detects the height change of the support base 1013, and the detection accuracy is 0.01 mm.

[0098] In another possible scenario, the vision sensor 103 and the support component 101 can be integrally configured, such as Figure 4 shown Figure 4 is a schematic structural diagram of another battery welding device provided by an embodiment of this specification; that is, the battery welding device further includes:

[0099] A first bracket 105;

[0100] Specifically, the first bracket 105 includes a first arm 1051, a bracket base 1052, and a second arm 1053. The first arm 1051 and the second arm 1053 stand at both ends of the bracket base 1052;

[0101] One end of the first arm 1051 is movably connected to the laser gun head 104, the other end of the first arm 1051 is connected to the bracket base 1052, and a vision sensor 103 is configured on the first arm 1051;

[0102] A support assembly 101 is configured on the bracket base 1052;

[0103] One end of the second arm 1053 is configured with a fixing assembly 102 so that the fixing assembly 102 is located above the support assembly 101, and the other end of the second arm 1053 is connected to the bracket base 1052. Of course, according to needs, the second arm 1053 can be set to be height-adjustable, or a lift-adjustable mechanism such as a rack and pinion, a worm and worm gear, a telescopic rod, etc. can be provided between the fixing assembly 102 and the second arm 1053 to achieve the height position adjustment of the fixing assembly 102.

[0104] Among them, since one end of the first arm 1051 is movably connected to the laser gun head 104, the height of the laser gun head 104 can be adjusted, that is, the gun head height compensation can be equivalent to the bottom height compensation, thereby improving the consistency of the welding process and avoiding the difference in laser intensity caused by different heights during the welding process.

[0105] According to needs, the vision sensor 103 can be configured to be vertically position-adjustable on the first arm 1051 to adapt to batteries of various specifications.

[0106] In addition, in Figure 4 the structure shown, the battery welding device further includes:

[0107] A discharge assembly 301;

[0108] The discharge assembly 301 screens the batteries in response to the control instructions output by the control algorithm, and the control algorithm is configured based on at least one of the compensation signal, the point displacement signal, and the height change signal.

[0109] Specifically, the discharge assembly 301 can be a fixture, a clamping robot, or other components with the function of moving the battery. The discharge assembly 301 can be configured as a separate device or integrated on the second arm 1053, which is not limited here.

[0110] Further, for the process of discharging the battery, that is, the screening process of the battery, a receiving assembly can be configured for the screened battery. The receiving assembly includes:

[0111] The second bracket 302, the first receiving groove 303, the discharging push rod 304, the conveyor belt 305, and the second receiving groove 306;

[0112] One end of the second bracket 302 is configured with the discharging push rod 304. The first receiving groove 303 is supported by the second bracket 302. One end of the conveyor belt 305 is docked with the first receiving groove 303, and the other end of the conveyor belt 305 is docked with the second receiving groove 306;

[0113] The discharging push rod 304 is used to push the battery transferred by the discharging assembly 301 from the first receiving groove 303 into the conveyor belt 305. The conveyor belt 305 is used to transport the battery to the second receiving groove 306, and the second receiving groove 306 is used to recycle the battery.

[0114] Considering that the conveyor belt 305 is in a moving state during the process of pushing the battery from the first receiving groove 303 into the conveyor belt 305, in order to avoid the deviation of the walking path of the battery at this time; therefore, baffles can be provided on both sides of the conveyor belt 305 along the pushing direction of the discharging push rod 304 to prevent the battery from falling off the conveyor belt 305 before reaching the second receiving groove 306. The baffle can be added to the mounting bracket of the conveyor belt 305 or to the edge of the surface of the conveyor belt 305. At this time, the baffle can be a skirt or a plurality of equally spaced strips, and the setting of the skirt or the strips does not affect the movement of the conveyor belt 305.

[0115] To ensure the orderly arrangement of the batteries in the second receiving groove 306, a transfer mechanism can be added above the outlet end of the first receiving groove 303 and the feeding end of the conveyor belt 305. The transfer mechanism can be a mechanism similar to a two-way opening and closing access control swing gate or a flap valve structure; or a partition plate can be provided on the surface of the conveyor belt 305. The partition plate extends along the pushing direction of the discharging push rod 304 and is equally spaced around the movement direction of the conveyor belt 305.

[0116] In addition, after the selected batteries are transported to the first receiving groove 303, further verification can be carried out, such as comparing the signals obtained by the ranging component, and then transporting them to the second receiving groove 306 for the collection and management of the batteries.

[0117] In summary, in this embodiment, the support component 101 receives the battery; the fixing component 102 is used to position the battery on the support component 101 and drive the battery to rotate; the vision sensor 103 is used to capture the end face of the battery and analyze and process the image of the end face of the battery to output a compensation signal; furthermore, the support component 101 responds to the compensation signal to adjust its height, so that the laser gun head 104 is used to weld the battery case and the top cover after the height of the support component 101 is adjusted. Through the process of vision-guided height compensation, the welding focus of the battery is kept at the same point, which can effectively control the consistency of the molten pool state, avoid the defocus amount fluctuation caused by circular runout, avoid abnormalities such as false soldering and welding through, improve the welding quality, and reduce the safety risk.

[0118] The above embodiment introduces the welding process of height adjustment according to the multi-dimensional detection of the battery. During the multi-dimensional detection process, unqualified batteries can be screened out. The screening process will be described below. As Figure 5 shown, Figure 5 is a schematic flow chart of a battery screening method provided by an embodiment of this specification; it includes the following steps:

[0119] 501. Obtain the detection information corresponding to the battery welding task. The detection information includes at least one of a compensation signal, a point displacement signal, and a height change signal. The compensation signal is determined by the vision sensor 103 through circularity detection by capturing the end face of the battery. The point displacement signal is determined by the first distance measurement component 201 by measuring the position change of any point on the end face arc of the battery. The height change signal is determined by the second distance measurement component 202 by measuring the height change of the support component 101.

[0120] In this embodiment, the compensation signal is the circularity simulation curve of the battery end face captured by the CCD, which represents the fitting compensation height line, code name: H.

[0121] The point displacement signal is the detection of the height of the battery vertex during the welding process by the laser rangefinder 1 (the first distance measurement component 201), which represents the defocus deviation line, code name: Z.

[0122] The height change signal is the detection of the actual compensation height change during the welding process of the detection base platform by the laser rangefinder 2 (the second distance measurement component 202), which represents the actual compensation line, code name: Y.

[0123] By combining and calculating the above different curves, the welding result of the battery cell is determined. For example, select one signal for determination; or select multiple signals for combined determination.

[0124] 502. Output characteristic parameters based on the detection information.

[0125] In this embodiment, the characteristic parameters are the threshold parameters configured based on the above compensation signal, point displacement signal, and height change signal.

[0126] Specifically, for the calculation of the characteristic parameters corresponding to the compensation signal, it can be the difference between the maximum value of the fitting compensation height and the minimum value of the fitting compensation height, which is used to represent the extreme value of the roundness deviation of the battery end face. The larger this value is, the greater the possibility that the battery end face bounces during rotation.

[0127] For example, for the screening (NG) algorithm in this scenario, the following can be obtained Figure 6 the data shown Figure 6 is a schematic diagram of the scenario of a battery screening method provided by an embodiment of this specification; for the battery roundness NG algorithm, it is obtained that

[0128] If the maximum value of the fitting compensation height - the minimum value of the fitting compensation height ≥ 1.2 mm, that is, H(max) - H(min) ≥ 1.2 mm, then it is determined that the roundness is NG, and the battery is discharged to the NG slot (the first receiving slot 303 or the second receiving slot 306).

[0129] In a possible scenario, for the above screening threshold of 1.2 mm, different screening values can be configured according to different materials of the housing (or different quality requirements); that is, the influence of the defocus amount on the stability of the molten pool during welding is different for different materials. For example, since materials with higher melting points and expansion coefficients are less sensitive to the welding process, their screening thresholds can be configured larger.

[0130] For scenarios with different battery specifications, the thickness of the battery can be determined. The larger the thickness, the larger the screening threshold that can be configured. Or for scenarios with different quality requirements, the higher the specified airtightness of the battery, the smaller the screening threshold that can be configured, so as to achieve the dynamic screening process of the battery.

[0131] Through the combination of vision and algorithm, battery cores with abnormal roundness dimensions can be effectively detected. For this part of the batteries, rework can be carried out to improve the process quality yield and reduce cost losses.

[0132] In addition, for the calculation of the characteristic parameters corresponding to the point displacement signal, it can be the difference between the fitting compensation height value and the actual compensation value, that is, to avoid the compensation error caused by the information conduction - execution time delay. Specifically, the following can be obtained Figure 7 the data shown Figure 7 is a schematic diagram of the scenario of a battery screening method provided by an embodiment of this specification; the figure shows the results of the actual compensation NG algorithm.

[0133] That is, at the same abscissa, if the fitting compensation height value - the actual compensation value ≥ 0.5 mm, that is, △H - △Y ≥ 0.5 mm, then it is determined that the compensation fails, and the battery is discharged to the NG slot.

[0134] Among them, 0.5mm is the screening value, which reflects the error tolerance for information conduction - execution delay. The higher the battery quality requirement, the smaller this value can be configured.

[0135] In addition, for the calculation of the characteristic parameters corresponding to the height change signal, it can be the maximum defocus deviation and the minimum defocus deviation, which corroborate with the roundness fitting process. The roundness fitting process (compensation signal) is the overall fitting dimension, while the calculation of the defocus deviation is the single - point execution dimension, thus realizing a comprehensive battery screening process.

[0136] Specifically, the algorithm configuration process can obtain Figure 8 the data shown, Figure 8 which is a schematic diagram of the scenario of a battery screening method provided by an embodiment of this specification; that is, for the calculation of the defocus deviation NG algorithm:

[0137] If the maximum defocus deviation - the minimum defocus deviation ≥ 0.2mm, that is, Z(max) - Z(min) ≥ 0.5mm, then it is determined that the defocus deviation is NG, and the battery is discharged to the NG slot.

[0138] Among them, 0.5mm is the screening value, which can also be expressed as a percentage. For example, the single - point error does not exceed 5%; this ranging process can detect the actual circular run - out during the welding process, indirectly reflecting the welding stability and screening out defective products.

[0139] 503. Control the discharge component to screen the battery according to the characteristic parameters.

[0140] In this embodiment, through the calculation of the threshold parameters configured based on the above - mentioned compensation signal, point displacement signal, and height change signal, targeted screening can be carried out.

[0141] Specifically, in combination with Figure 4 the device shown, a progressive processing process of characteristic parameters can be carried out. For example, the discharge component judges according to the characteristic parameters of the compensation signal. If the conditions are met, the battery is transferred to the first receiving slot 303, and then the characteristic parameters of the point displacement signal or the height change signal are judged in the first receiving slot 303. If the conditions are met, the discharge push rod 304 is controlled to transfer the battery to the second receiving slot 306; thus realizing a NG algorithm review process with two - time responses, avoiding mis - processing caused by the error of a single algorithm, and improving the accuracy of battery screening.

[0142] It should be noted that each of the multiple embodiments in this specification emphasizes the parts different from other embodiments, and the embodiments can be mutually explained. Any combination of the multiple embodiments by those skilled in the art based on general technical knowledge is covered within the scope disclosed in this specification.

[0143] In an exemplary embodiment of the present specification, a screening device 900 is further provided. As Figure 9 shown, Figure 9 This is a schematic diagram of the functional modules of the battery screening device provided in an embodiment of the present specification. The screening device 900 includes:

[0144] An acquisition unit 901, configured to acquire detection information corresponding to a battery welding task, where the detection information includes at least one of a compensation signal, a point displacement signal, and a height change signal. The compensation signal is determined by a vision sensor through circularity detection of the end face of the battery. The point displacement signal is determined by a first ranging component through measuring the position change of any point on the end face arc of the battery. The height change signal is determined by a second ranging component through measuring the height change of the support component;

[0145] A processing unit 902, configured to output characteristic parameters based on the detection information;

[0146] The processing unit 902 is further configured to control the discharge component to screen the batteries according to the characteristic parameters

[0147] Specifically, the acquisition unit and the processing unit in this embodiment may correspond to physical components. For example, the processing unit may be a processing module such as a CPU, a GPU, or an FPGA. The specific selection of the physical components may be any component and combination of components with the above functions. The specific manner depends on the actual scenario and is not limited herein.

[0148] The above screening device determines the qualification of the battery through multi-dimensional detection information obtained during the welding process of the battery, can monitor the welding process of the battery in real time, and immediately exclude the batteries that may not meet the welding requirements, improving the reliability of the battery.

[0149] For the specific limitations of the battery screening device, reference can be made to the limitations of the battery screening device in the above text, which will not be elaborated here. Each unit module in the above screening device can be implemented in whole or in part through software, hardware, and their combinations. The above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0150] Another embodiment of the present application further proposes a computing device. Refer to Figure 10 shown. An exemplary embodiment of the present specification further provides a computing device, including: a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it executes the steps in the battery screening device according to various embodiments of the present specification described above.

[0151] The internal structure of the computing device can be as follows Figure 10 As shown, the computing device includes a processor, a memory, a network interface, and an input device connected via a system bus. Among them, the processor of the computing device is used to provide computing and control capabilities. The memory of the computing device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computing device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, it performs the steps in the battery screening device according to various embodiments of this specification described in the above embodiments of this specification.

[0152] The processor may include a main processor, and may also include a baseband chip, a modem, etc.

[0153] The memory stores a program for implementing the technical solution of the present invention, and may also store an operating system and other key services. Specifically, the program may include program code, and the program code includes computer operation instructions. More specifically, the memory may include a read-only memory (ROM), other types of static storage devices that can store static information and instructions, a random access memory (RAM), other types of dynamic storage devices that can store information and instructions, a disk memory, a flash memory, etc.

[0154] The processor may be a general-purpose processor, such as a general-purpose central processing unit (CPU), a microprocessor, etc., or an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present invention. It may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0155] The input device may include a device for receiving user input data and information, such as a keyboard, a mouse, a camera, a scanner, a light pen, a voice input device, a touch screen, a pedometer, or a gravity sensor, etc.

[0156] The output device may include a device for allowing outputting information to the user, such as a display screen, a printer, a speaker, etc.

[0157] The communication interface may include any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, a radio access network (RAN), a wireless local area network (WLAN), etc.

[0158] The processor executes the program stored in the memory and calls other devices, which can be used to implement each step of any battery screening device provided in the above embodiments of the present application.

[0159] The computing device may further include a display component and a voice component. The display component may be a liquid crystal display screen or an electronic ink display screen. The input device of the computing device may be a touch layer covering the display component, or a button, a trackball or a touchpad provided on the housing of the computing device, or an external keyboard, a touchpad or a mouse, etc.

[0160] Those skilled in the art can understand that Figure 10 the structure shown in is only a block diagram of some structures related to the solution of this specification, and does not constitute a limitation on the computing device to which the solution of this specification is applied. The specific computing device may include more or fewer components than those shown in the figure, or combine some components, or have a different component layout.

[0161] In addition to the above methods and devices, the battery screening device provided in the embodiments of this specification may also be a computer program product, which includes a computer program. When the computer program is run by a processor, the processor executes the steps in the battery screening device according to various embodiments of this specification described in the "Exemplary Method" section above.

[0162] The computer program product may be written in any combination of one or more programming languages to write program code for performing the operations of the embodiments of this specification. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's device, executed as an independent software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0163] In addition, the embodiments of this specification further provide a computer-readable storage medium, on which a computer program is stored. The computer program is executed by a processor to perform the steps in the battery screening device according to various embodiments of this specification described in the "Exemplary Method" section above.

[0164] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in this specification can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (SynchLink) DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0165] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0166] The above-described embodiments merely represent several implementation manners of this specification. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the solutions provided by the embodiments of this specification. It should be noted that for those of ordinary skill in the art, without departing from the concept of this specification, several modifications and improvements can still be made, and these all belong to the protection scope of this specification. Therefore, the protection scope of the patent of this specification should be subject to the appended claims.

Claims

1. A battery welding device, characterized in that, Comprising: A support component, a fixing component, a vision sensor, and a laser gun head; Wherein, the support component is used to hold the battery; The fixing component is used to limit the battery on the support component and drive the battery to rotate; the vision sensor is used to photograph the end face of the battery and output a compensation signal according to the end face of the battery; the support component adjusts its height in response to the compensation signal; the laser gun head is used to weld the shell and the top cover of the battery after the support component adjusts its height.

2. The device according to claim 1, characterized in that, The support component includes: A power driving mechanism, a telescopic rod, a support base, and a lifting wheel; The power driving mechanism is connected to the first end of the telescopic rod, the second end of the telescopic rod is connected to the bottom of the support base, and the lifting wheel is arranged on the support base; The lifting wheel is used to support the rotation process of the battery, and the power driving mechanism is used to drive the telescopic rod to adjust its height in response to the compensation signal.

3. The device according to claim 2, characterized in that, The device further includes: A plurality of slide rails; The support base is provided with a limiting hole having the same number as the slide rails, and the aperture of the limiting hole corresponds to the diameter of the slide rails; The slide rails are slidably connected to the support base based on the limiting holes.

4. The device according to claim 2, wherein The device further includes: A plurality of sliding grooves; The number of the sliding grooves corresponds to the lifting wheels, and the lifting wheels slide along the groove bodies of the sliding grooves.

5. The device according to claim 1, characterized in that, The device further includes: A first bracket; The first bracket includes a first arm, a bracket base, and a second arm. The first arm and the second arm stand at both ends of the bracket base; One end of the first arm is movably connected to the laser gun head, the other end of the first arm is connected to the bracket base, and the vision sensor is arranged on the first arm; The support component is arranged on the bracket base; One end of the second arm is provided with the fixing component so that the fixing component is located above the support component, and the other end of the second arm is connected to the bracket base.

6. The device according to claim 1, characterized in that, The device further includes: A first distance measuring component; The first distance measuring component is arranged on the side of the laser gun head. The first distance measuring component is used to measure the position change of any point on the end face arc of the battery and generate a point displacement signal; and / or The device includes: A second distance measuring component; The second distance measuring component is arranged on the side of the laser gun head. The second distance measuring component is used to measure the height change of the support component and generate a height change signal.

7. The device according to claim 6, characterized in that The device further includes: A discharging component; The discharging component screens the battery in response to a control instruction output by a control algorithm, and the control algorithm is configured based on at least one of the compensation signal, the point displacement signal, and the height change signal.

8. The device according to claim 7, characterized in that The device further includes: A second bracket, a first receiving groove, a discharging push rod, a conveyor belt, and a second receiving groove; One end of the second bracket is provided with the discharging push rod, the first receiving groove is supported by the second bracket, one end of the conveyor belt is docked with the first receiving groove, and the other end of the conveyor belt is docked with the second receiving groove; The discharge push rod is used to push the battery transferred by the discharge assembly from the first receiving groove into the conveyor belt, and the conveyor belt is used to transport the battery to the second receiving groove, and the second receiving groove is used to recycle the battery.

9. A battery, characterized in that, Comprising: A housing and a top cover, and the housing and the top cover are welded by the battery welding device according to any one of claims 1-9.

10. A control system of a battery welding device, characterized in that, Comprising: A memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor is configured to: Obtain detection information corresponding to a battery welding task, the detection information including at least one of a compensation signal, a point displacement signal, and a height change signal, the compensation signal being determined by a vision sensor through circularity detection of the end face of the battery, the point displacement signal being determined by a first distance measurement component through measuring the position change of any point on the end face arc of the battery, and the height change signal being determined by a second distance measurement component through measuring the height change of the support component; Output characteristic parameters based on the detection information; Control the discharge assembly to screen the battery according to the characteristic parameters.

Images