CN218917041U - Pulling force detection device and battery production line - Google Patents
Pulling force detection device and battery production line Download PDFInfo
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- CN218917041U CN218917041U CN202222742214.9U CN202222742214U CN218917041U CN 218917041 U CN218917041 U CN 218917041U CN 202222742214 U CN202222742214 U CN 202222742214U CN 218917041 U CN218917041 U CN 218917041U
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Abstract
The utility model relates to the technical field of detection equipment, and discloses a tension detection device and a battery production line, wherein the tension detection device is used for detecting welding tension between a first workpiece and a second workpiece and comprises the following components: the fixing mechanism is used for fixing the first workpiece; the clamping mechanism is used for clamping the second workpiece, and the clamping force detection assembly is arranged on the clamping mechanism and is used for adjusting the clamping force applied to the second workpiece so that the real-time clamping force is kept stable; and the moving mechanism is used for driving the clamping mechanism and the second workpiece to move for tension detection. According to the tension detection device and the battery production line, the fixing mechanism, the clamping mechanism and the moving mechanism are arranged to detect the welding tension between the first workpiece and the second workpiece, so that the detection accuracy is improved; the clamping force detection assembly is arranged, so that the clamping force applied to the second workpiece by the clamping mechanism is controllable, and the detection accuracy is improved.
Description
Technical Field
The utility model relates to the technical field of detection equipment, in particular to a tension detection device and a battery production line.
Background
At present, the cylindrical battery is popular in the field of new energy batteries and is favored by the market. The welding quality of the steel shell spot bottom is critical to the influence of internal resistance in the performance of the battery cell. The existing lithium battery industry spot bottom welding tension detection is basically divided into two modes, namely a mode of inverting an electric core, namely whether the electrode lug and the steel shell are reliably welded or not is measured by detecting the displacement of the winding core through the dead weight of the winding core, and the mode has the problem that the accuracy of judgment is influenced on the external diameter of the incoming material of the winding core; another way is to judge the tensile force value under the specified displacement, this way feeds back the tensile force value to judge whether the welding result meets the technological requirement to judge the welding reliability by setting the rising specified distance, this way has the following problems: the detection of the tension value is to indirectly collect the value of the sensor, and the value collected after the change of the clamping force can influence the accuracy of the test result.
The existing spot bottom welding tension detection mode has the problems of low detection accuracy and easy misjudgment and missed judgment.
Disclosure of Invention
The utility model provides a tension detection device and a battery production line, which are used for solving the problems of low detection accuracy and easiness in misjudgment and omission of judgment in a spot-bottom welding tension detection mode in the prior art.
The utility model provides a tension detection device for detecting welding tension between a first workpiece and a second workpiece, wherein the first workpiece and the second workpiece are welded and connected, and the tension detection device comprises:
a fixing mechanism for fixing the first workpiece;
the clamping mechanism is used for clamping the second workpiece, the clamping force detection assembly is arranged on the clamping mechanism and used for detecting the real-time clamping force of the clamping mechanism on the second workpiece, and the clamping mechanism is used for adjusting the clamping force applied to the second workpiece so that the real-time clamping force is kept stable;
the clamping mechanism is connected to the moving mechanism, and the moving mechanism is used for driving the clamping mechanism and the second workpiece to move relative to the first workpiece to carry out tension detection.
According to the tension detection device provided by the utility model, the real-time clamping force forms static friction force on the second workpiece, and the clamping mechanism is used for adjusting the clamping force applied to the second workpiece so that the static friction force is smaller than the theoretical maximum bearing tension between the first workpiece and the second workpiece;
the moving mechanism is used for moving a preset distance, and the preset distance is larger than the theoretical maximum movable distance of the second workpiece relative to the first workpiece;
and the tension detection device judges whether the welding tension meets the requirement according to the state of the first workpiece and/or the second workpiece after the moving mechanism moves.
The tension detection device provided by the utility model further comprises a distance detection assembly, a tension detection assembly and a tension detection assembly, wherein the distance detection assembly is used for detecting the actual displacement of the second workpiece;
and the tension detection device judges that the welding tension meets the requirement when the actual displacement is smaller than or equal to the theoretical maximum movable distance.
According to the tension detection device provided by the utility model, the fixing mechanism comprises the first driving structure and the fixing piece connected with the first driving structure, the first driving structure is used for driving the fixing piece to move up and down, the fixing piece is pressed on the first workpiece, and the fixing piece is provided with the hollowed-out part corresponding to the second workpiece.
According to the tension detection device provided by the utility model, the clamping mechanism comprises the second driving structure and the clamping jaw assembly connected with the second driving structure, the clamping jaw assembly comprises two jaw bodies, the second driving structure is used for driving the two jaw bodies to move in opposite directions or in opposite directions, and the clamping force detection assembly is arranged between the two jaw bodies.
According to the tension detection device provided by the utility model, the two claw bodies are respectively provided with the mounting grooves on the opposite side surfaces, the positions of the mounting grooves on the two claw bodies correspond to each other, and the clamping force detection assembly comprises the pressure sensor which is arranged at the mounting grooves.
According to the tension detection device provided by the utility model, the second driving structure comprises the first motor, the bidirectional screw rod and the first transmission pair, the first motor is connected with the bidirectional screw rod, two sections of threads with opposite rotation directions are arranged on the bidirectional screw rod, the first transmission pair is respectively connected with the two sections of threads with opposite rotation directions in a threaded manner, and the two claw bodies are connected with the two first transmission pairs in a one-to-one correspondence manner.
According to the tension detection device provided by the utility model, the second driving structure is arranged on the mounting plate, the mounting plate is connected with the moving mechanism, and a linear sliding rail structure is further arranged between the first transmission pair and the mounting plate.
According to the tension detection device provided by the utility model, the moving mechanism comprises a second motor, a unidirectional screw rod and a second transmission pair, the second motor is connected with the unidirectional screw rod, the unidirectional screw rod is in threaded connection with the second transmission pair, and the clamping mechanism is connected with the second transmission pair.
The utility model also provides a battery production line, which comprises the tension detection device.
According to the tension detection device and the battery production line, the fixing mechanism, the clamping mechanism and the moving mechanism are arranged, and the welding tension between the first workpiece and the second workpiece is detected through the matched movement of the fixing mechanism, the clamping mechanism and the moving mechanism, so that compared with the traditional method of detecting the welding tension by adopting the inverted battery cell, the welding tension detection device and the battery production line are beneficial to more accurately controlling parameters such as the moving distance and the like in the detection process, and further beneficial to improving the detection accuracy; and set up clamping force detection component for clamping force that fixture applyed the second work piece is controllable, can avoid influencing the problem of testing result accuracy because the clamping force changes, is favorable to improving the accuracy of detection.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an overall schematic diagram of a tension detecting apparatus provided by the present utility model;
FIG. 2 is a schematic structural view of a fixing mechanism according to the present utility model;
FIG. 3 is a schematic view of a clamping mechanism according to the present utility model;
fig. 4 is a schematic structural view of a moving mechanism provided by the present utility model.
Reference numerals:
1: a fixing mechanism; 101: a first driving structure; 102: a fixing member; 103: a hollowed-out part; 2: a clamping mechanism; 201: a first motor; 202: a two-way screw rod; 203: a first transmission pair; 204: a claw body; 205: a mounting groove; 206: a pressure sensor; 207: a linear slide rail structure; 208: a coupling; 209: a bearing; 3: a moving mechanism; 301: a second motor; 302: a unidirectional screw rod; 303: a second transmission pair; 304: an optoelectronic switch; 4: a mounting plate; 5: a distance detection assembly; 6: a first support base; 7: a second support base; 8: a steel shell; 9: and a battery cell.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The tension detecting apparatus and the battery production line of the present utility model are described below with reference to fig. 1 to 4.
Referring to fig. 1, the present embodiment provides a tension detecting apparatus for detecting a welding tension between a first workpiece and a second workpiece, the first workpiece and the second workpiece being welded, the tension detecting apparatus including: a fixing mechanism 1 for fixing the first workpiece; the clamping mechanism 2 is used for clamping the second workpiece, the clamping force detection component is arranged on the clamping mechanism 2 and used for detecting the real-time clamping force of the clamping mechanism 2 on the second workpiece, and the clamping mechanism 2 is used for adjusting the clamping force applied to the second workpiece so that the real-time clamping force is kept stable; and the moving mechanism 3 is connected with the clamping mechanism 2 and is used for driving the clamping mechanism 2 and the second workpiece to move relative to the first workpiece to detect the tensile force.
The tension detection device provided by the embodiment is used for detecting welding tension between two workpieces, the two workpieces can be a first workpiece and a second workpiece, the first workpiece and the second workpiece are welded and connected, and the tension detection device can be used for detecting whether the welding tension between the first workpiece and the second workpiece meets the requirement.
Specifically, when welding tension detection is performed, the position of the first workpiece is fixed through the fixing mechanism 1, then the second workpiece is clamped through the clamping mechanism 2, the clamping mechanism 2 and the second workpiece are driven to move relative to the first workpiece under the action of the moving mechanism 3, namely, the second workpiece is pulled to be far away from the first workpiece for tension detection, and whether the welding tension meets the requirement is judged through parameters, such as the moving distance and/or the tension value applied to the second workpiece, in the moving process of the second workpiece relative to the first workpiece.
And this embodiment is equipped with clamping force detection component on fixture 2, and clamping force detection component can detect the real-time clamping force that fixture 2 applyed to the second work piece, can control fixture 2 according to clamping force detection component's detection information and adjust the clamping force to the second work piece to make the clamping force that applys to the second work piece controllable. When welding tension is detected, the real-time clamping force applied to the second workpiece by the clamping mechanism 2 can be controlled to be stable, namely, the real-time clamping force is a fixed value, so that the problem of accuracy of a detection result caused by the change of the clamping force can be avoided, and the accuracy of detection is improved.
According to the tension detection device provided by the embodiment, the fixing mechanism 1, the clamping mechanism 2 and the moving mechanism 3 are arranged, and the welding tension between the first workpiece and the second workpiece is detected through the matched movement of the fixing mechanism 1, the clamping mechanism 2 and the moving mechanism, so that the welding tension is detected in an inverted mode compared with the existing mode of adopting the battery cell 9, the parameters in the detection process such as the moving distance and the like can be controlled more accurately, and the detection accuracy can be improved; and set up clamping force detection component for clamping force that fixture 2 applyed the second work piece is controllable, can avoid influencing the problem of testing result accuracy because the clamping force changes, is favorable to improving the accuracy of detection.
Further, the tension detecting device provided in this embodiment is provided with the fixing mechanism 1, the clamping mechanism 2 and the moving mechanism 3, which can be controlled electrically, and is also beneficial to realizing automatic welding tension detection.
According to some embodiments of the utility model, the real-time clamping force forms a static friction force on the second workpiece, and the clamping mechanism 2 is configured to adjust the clamping force applied to the second workpiece such that the static friction force is less than a theoretical maximum bearing tension between the first workpiece and the second workpiece. I.e. the clamping force exerted by the clamping mechanism 2 on the second workpiece causes a static friction between the second workpiece and the clamping mechanism 2, which static friction serves to stabilize the relative position between the clamping mechanism 2 and the second workpiece, preventing relative movement between the second workpiece and the clamping mechanism 2.
The clamping force of the clamping mechanism 2 on the second workpiece is adjustable, and the clamping force applied by the clamping mechanism 2 on the second workpiece can be adjusted, so that the static friction force between the clamping mechanism 2 and the second workpiece is smaller than the theoretical maximum bearing tension. The theoretical maximum bearing tension is the maximum tension value which can be born when the welding of the first workpiece and the second workpiece meets the requirement. When the welding of the first workpiece and the second workpiece meets the requirement, the position of the first workpiece is kept fixed, and when a pulling force value smaller than or equal to the theoretical maximum bearing pulling force is applied to the second workpiece, the welding part between the first workpiece and the second workpiece is not damaged.
Further, the moving mechanism 3 is configured to move a preset distance, where the preset distance is greater than a theoretical maximum movable distance of the second workpiece relative to the first workpiece. After the moving mechanism 3 moves, the tension detecting device determines whether the welding tension meets the requirement according to the state of the first workpiece and/or the second workpiece.
Namely, the first workpiece and the second workpiece are welded and connected, but the second workpiece still has a certain displacement space relative to the first workpiece, and the second workpiece can move a certain distance relative to the first workpiece. The theoretical maximum movable distance is the maximum distance that the second workpiece can move relative to the first workpiece when the welding of the first workpiece and the second workpiece meets the requirements. When the welding of the first workpiece and the second workpiece meets the requirement, the position of the first workpiece is kept fixed, and when the distance of moving the second workpiece is smaller than or equal to the theoretical maximum movable distance, the welding part between the first workpiece and the second workpiece is not damaged; when the distance of the second workpiece is greater than the theoretical maximum movable distance, the welded part between the first workpiece and the second workpiece is damaged.
In the embodiment, the static friction force between the clamping mechanism 2 and the second workpiece is smaller than the theoretical maximum bearing tension force, so that when the moving distance of the moving mechanism 3 is larger than the theoretical maximum movable distance in the process that the moving mechanism 3 drives the clamping mechanism 2 to move, if the welding between the first workpiece to be detected and the second workpiece meets the requirement, the second workpiece and the clamping mechanism 2 are prevented from continuously moving integrally under the action of the actual welding tension force, the second workpiece is separated from the clamping mechanism 2, and the welding part between the first workpiece and the second workpiece is not damaged; if the welding between the first workpiece to be measured and the second workpiece does not meet the requirement, the actual welding tension cannot prevent the second workpiece from moving integrally with the clamping mechanism 2, at this time, the second workpiece can move integrally with the clamping mechanism 2, so that the moving distance of the second workpiece is greater than the theoretical maximum movable distance, and the welding part between the first workpiece and the second workpiece can be damaged.
Based on this, the tension detecting device can determine whether the welding tension meets the requirement according to the state of the first workpiece and/or the second workpiece after the moving mechanism 3 drives the clamping mechanism 2 to move for a preset distance.
According to some embodiments of the present utility model, the tension detecting apparatus further includes a distance detecting component 5 for detecting an actual displacement of the second workpiece; and the tension detection device judges that the welding tension meets the requirement when the actual displacement is smaller than or equal to the theoretical maximum movable distance. The embodiment provides a specific judgment method for tension detection, namely a distance detection assembly 5 is arranged and is used for detecting the actual displacement of a second workpiece in the process of moving a preset distance by a moving mechanism 3; if the actual displacement of the second workpiece is smaller than or equal to the theoretical maximum movable distance, the actual welding tension between the first workpiece and the second workpiece is indicated to prevent the second workpiece and the moving mechanism 3 from integrally moving to a preset distance, and at the moment, the actual welding tension can be judged to meet the requirement.
Further, if the actual displacement amount of the second workpiece is larger than the theoretical maximum movable distance, it is indicated that the actual welding tension between the first workpiece and the second workpiece cannot prevent the second workpiece from integrally moving with the moving mechanism 3 beyond the theoretical maximum movable distance, and it is determined that the welding tension does not meet the requirement.
Further, the actual displacement amount of the second workpiece is the maximum displacement amount of the second workpiece during the movement of the movement mechanism 3. For example, when the welding tension satisfies the requirement, the second workpiece moves integrally with the moving mechanism 3 during the movement of the moving mechanism 3, and then the second workpiece may be separated from the clamping mechanism 2 and may return to the initial position, and at this time, the maximum displacement amount during the movement of the second workpiece is the actual displacement amount.
The tension detection device provided by the embodiment not only can improve the accuracy of welding tension detection, effectively improve the conditions of easy misjudgment and missed judgment of the existing detection mode, but also can not cause irreversible damage to the involutory product in the detection process, solves the problem that the accuracy of tension and distance setting in the existing detection mode for judging the tension value under the specified displacement is easy to cause damage to good products after passing through a tension detection station, and is favorable for improving the product qualification rate and reducing the reworking product rate.
Further, in other embodiments, the tension detecting device may further determine whether the welding tension meets the requirement according to other states of the first workpiece and/or the second workpiece, for example, may analyze a state of a welding portion between the first workpiece and the second workpiece after the moving mechanism 3 moves by a preset distance, and determine that the welding tension meets the requirement when the state of the welding portion meets the preset requirement; and when the state of the welding part does not meet the preset requirement, judging that the welding tension does not meet the requirement. The basis for judging whether the welding tension meets the requirement by the tension detection device is not particularly limited, and the purpose of distinguishing qualified products from unqualified products is achieved.
According to the tension detecting apparatus of some embodiments of the present utility model, referring to fig. 2, the fixing mechanism 1 includes a first driving structure 101 and a fixing member 102 connected to the first driving structure 101, where the first driving structure 101 is used to drive the fixing member 102 to move up and down, and the fixing member 102 is pressed against the first workpiece. When welding tension is detected, the first driving structure 101 can drive the fixing piece 102 to move downwards, and the fixing piece 102 is pressed on the first workpiece, so that the first workpiece is fixed in the height direction. The moving mechanism 3 can drive the clamping mechanism 2 and the second workpiece to move upwards.
And the fixing piece 102 is provided with a hollowed-out part 103 corresponding to the second workpiece. The hollowed-out part 103 is a corresponding avoiding part of the fixing piece 102, which corresponds to the second workpiece, so that the fixing piece 102 can be well pressed and fixed on the first workpiece, and the second workpiece can move relative to the first workpiece through the hollowed-out part 103, thereby facilitating tension detection.
Further, the first driving structure 101 includes a cylinder structure. The cylinder structure can drive the fixing piece 102 to move along a straight line, so that the first workpiece is pressed and fixed. The cylinder structure may be vertically arranged to drive the fixing member 102 to move up and down. In other embodiments, the first driving structure 101 may also be other structures capable of driving the fixing member 102 to move up and down, such as a linear sliding table, a screw nut, and the like, which are not limited in particular.
According to some embodiments of the present utility model, referring to fig. 3, the clamping mechanism 2 includes a second driving structure and a clamping jaw assembly connected to the second driving structure, where the clamping jaw assembly includes two jaw bodies 204, the second driving structure is used to drive the two jaw bodies 204 to move toward or away from each other, and the clamping force detecting assembly is disposed between the two jaw bodies 204.
The two claw bodies 204 of the clamping jaw assembly can move towards each other, namely, the two claw bodies 204 move close to each other, so that a second workpiece can be clamped; the two jaws 204 can also be moved away from each other, i.e. the two jaws 204 can be moved away from each other, so that the second workpiece can be released. The clamping force detection assembly is capable of detecting a clamping force between two of the jaws 204 between the two jaws 204. The second driving structure can drive the two claw bodies 204 to move to adjust the clamping force between the two claw bodies 204, namely, the clamping force applied by the clamping jaw to the second workpiece is adjusted, so that the real-time clamping force is controllable.
According to the tension detecting device of some embodiments of the present utility model, the two claw bodies 204 are respectively provided with mounting grooves 205 on opposite sides, the positions of the mounting grooves 205 on the two claw bodies 204 correspond to each other, and the clamping force detecting assembly includes a pressure sensor 206, and the pressure sensor 206 is disposed at the mounting groove 205.
That is, the side of each jaw 204 opposite to the other jaw 204 is provided with a mounting groove 205, and the positions of the two mounting grooves 205 on the two jaw 204 correspond to each other, that is, when the closing space of the two jaw 204 is zero, the two mounting grooves 205 can be connected, so that a mounting space of the clamping force detection assembly is formed between the two jaw 204 at the mounting groove 205. The clamping force detecting component may be a pressure sensor 206, where the pressure sensor 206 may be installed at the installation groove 205, and when the two claw bodies 204 clamp the second workpiece, the pressure sensor 206 abuts between the two claw bodies 204 to detect the pressure between the two claw bodies 204, and the pressure is the clamping force applied by the claw bodies 204 to the second workpiece.
Specifically, the pressure sensor 206 may be mounted in one of the mounting grooves 205, and when the two claw bodies 204 move toward each other to clamp the second workpiece, the pressure sensor 206 may abut against the two claw bodies 204.
According to the tension detecting device of some embodiments of the present utility model, the second driving structure includes a first motor 201, a bidirectional screw rod 202, and a first transmission pair 203, where the first motor 201 is connected to the bidirectional screw rod 202, two threads with opposite rotation directions are provided on the bidirectional screw rod 202, the two threads with opposite rotation directions are respectively connected to the first transmission pair 203 by threads, and two claw bodies 204 are connected to the two first transmission pairs 203 in a one-to-one correspondence.
The present embodiment provides a specific arrangement structure of the second driving structure, where the second driving structure may adopt a screw-nut structure, specifically, the first motor 201 may be in transmission connection with the bidirectional screw 202 through the coupling 208, the first motor 201 may drive the bidirectional screw 202 to rotate, and the bidirectional screw 202 rotates to drive the two first transmission pairs 203 to move in opposite directions or in opposite directions, so as to drive the two claw bodies 204 to move in opposite directions or in opposite directions.
According to some embodiments of the utility model, the second driving structure is mounted on a mounting plate 4, and the mounting plate 4 is connected to the moving mechanism 3. That is, the second driving structure may be connected to the moving mechanism 3 through the mounting plate 4, and the moving mechanism 3 may drive the mounting plate 4 and the second driving structure to move integrally. A linear sliding rail structure 207 is also arranged between the first transmission pair 203 and the mounting plate 4. The linear slide rail can be arranged on the mounting plate 4, and the first transmission pair 203 is in sliding connection with the linear slide rail, so that linear movement of the first transmission pair 203 can be well limited, and the stability of adjusting the interval between the two claw bodies 204 can be improved. The direction of the linear slide structure 207 may be parallel to the axial direction of the bi-directional screw 202.
In other embodiments, the second driving structure may be other types, such as a clamping jaw cylinder, which has two jaw bodies 204 and can drive the two jaw bodies 204 to move toward or away from each other. The specific form of the second driving structure is not limited.
According to the tension detecting device of some embodiments of the present utility model, referring to fig. 4, the moving mechanism 3 includes a second motor 301, a unidirectional screw 302, and a second transmission pair 303, the second motor 301 is connected to the unidirectional screw 302, the unidirectional screw 302 is screwed to the second transmission pair 303, and the clamping mechanism 2 is connected to the second transmission pair 303. The embodiment provides a specific setting structure of the moving mechanism 3, the moving mechanism 3 may adopt a screw-nut structure, specifically, the second motor 301 may be connected with the unidirectional screw 302 through the coupling 208, the unidirectional screw 302 is provided with threads with identical rotation directions, the second motor 301 drives the unidirectional screw 302 to rotate, and the unidirectional screw 302 rotates to drive the second transmission pair 303 to move along the unidirectional screw 302, so that the second transmission pair 303 can drive the clamping mechanism 2 to move.
Specifically, the second transmission pair 303 may be fixedly connected to the mounting plate 4, so that the second transmission pair 303 can drive the mounting plate 4 and the second driving structure to integrally move. The first motor 201 of the second driving structure may be fixed on the mounting plate 4, and the bidirectional screw 202 may be rotatably connected with the mounting plate 4 through a bearing 209, so as to realize connection between the second driving structure and the mounting plate 4.
According to some embodiments of the utility model, the moving mechanism 3 is configured to drive the clamping mechanism 2 to move up and down, and the distance detecting component 5 is disposed at a position corresponding to the height of the second workpiece. So as to detect the real-time position of the second workpiece and thereby obtain the actual displacement.
Further, the fixing mechanism 1 may be disposed on the first support 6, and the moving mechanism 3 may be disposed on the second support 7. By providing the first support seat 6 and the second support seat 7, each mechanism can perform the detection process more smoothly. The distance detecting assembly 5 may be provided on the second support 7. The distance detection component 5 may be a distance sensor.
According to some embodiments of the utility model, a battery production line includes a tension detecting device according to any one of the embodiments. Namely, the tension detection device can be used in battery production to detect the welding tension of a welding process in the battery production process. Specifically, the tension detection device can be used for detecting the spot bottom welding tension of the battery cell 9 and the steel shell 8. The battery production line can comprise a conveying line body, a welding tension detection station is arranged on the conveying line body, a tension detection device can be arranged at the station, and when a product to be detected is conveyed to the station along the conveying line body, automatic welding tension detection is carried out on the product to be detected.
On the basis of the above embodiment, in order to further solve the problems of misjudgment, missed judgment, detection failure and the like of the automatic welding tension detection station in the automatic spot welding equipment for the steel shell 8, the embodiment provides a spot bottom welding tension detection device for detecting spot bottom welding tension of the battery cell 9 and the steel shell 8. The spot bottom welding tension detecting device provided in this embodiment, as shown in fig. 1, is integrally divided into three parts, namely, a clamping mechanism 2, a moving mechanism 3 and a fixing mechanism 1. The fixing mechanism 1 in fig. 2 can be a steel shell 8 of which the pressing device mainly acts to fix the tested battery cell 9; in fig. 3, the clamping mechanism 2 mainly functions to apply a fixed clamping force to the tab of the incoming material cell 9 by using the high-precision pressure sensor 206 and the servo motor in cooperation; the moving mechanism 3 in fig. 4 may be an upward moving device, which mainly acts to lift the clamping mechanism 2 by a specified displacement amount through motor driving; the distance sensor in fig. 1 mainly has the function of accurately measuring the actual displacement of the winding core in the test process after the steel shell 8 is fixed in height, the clamping force of the tab is constant, and the upward displacement of the clamping mechanism 2 is set.
Specifically, the measured battery cell 9 moves to a tension detection procedure, and the cylinder structure in fig. 2 drives the pressing fixing piece 102 to complete the fixing of the measured battery cell 9 in the height direction of the steel shell 8; the servo motor in fig. 3, namely the first motor 201, acts, the clamping action of the electrode lug of the battery cell 9 is completed through the cooperation of the bidirectional screw rod 202 transmission pair and the linear slide rail pair, namely the linear slide rail structure 207, the servo motor is controlled through the high-precision pressure sensor 206, the constant clamping force in the detection process is realized, and the theoretical maximum bearing tension of the welding point of the inner electrode lug is considered in the setting of the clamping force.
The servo motor in fig. 4, namely the second motor 301, acts to complete the upward movement of the clamping mechanism 2 by a preset distance through the screw drive pair, wherein the preset distance considers the theoretical maximum movable distance of the inner tab design movement, and the preset distance is larger than the theoretical maximum movable distance of the inner tab design. The second motor 301 may be provided with a control switch for controlling the start and stop of the second motor 301 according to a set preset distance, so as to realize accurate control of the moving distance of the moving mechanism 3. Specifically, the control switch may be a photoelectric switch 304, where the photoelectric switch 304 is disposed on a moving path of the second transmission pair 303, and the second motor 301 is controlled to start or stop by detecting a position of the second transmission pair 303. The position of the upward movement and the origin position are confirmed by the photoelectric switch 304.
In the distance sensor shown in fig. 1, the initial winding core position is detected before the upward movement, the actual displacement of the winding core is calculated by a difference value in the detection process, the actual displacement comparison value is set by considering the maximum movable distance H of the tab theory, and the comparison value is equal to the maximum movable distance of the tab theory. When the qualified product, namely the OK product passes through, the actual welding tension is larger than the static friction force applied to the lug by the set constant clamping force, the lug and the clamping jaw slide, and the actual displacement is detected to be less than or equal to H; when the unqualified products, namely NG products (unwelded, cold welded and overselded), pass, the actual displacement of the winding core is larger than the theoretical maximum movable distance (i.e. more than H) of the inner tab design because the actual welding tension is smaller than the static friction force applied to the tab by the set constant clamping force.
Further, the tension detecting device provided in this embodiment is used for detecting the spot bottom welding tension of the battery core 9 and the steel shell 8, and can also be used for judging whether the inner tab of the battery core 9 is in cold joint with the steel shell 8. Namely, for the battery cell structure of the bipolar lug, two lugs are required to be welded with the steel shell 8, and the existing spot bottom welding tension detection mode is not easy to detect the cold joint condition between the inner lug and the steel shell 8 in the two lugs. The specific detection process for detecting the cold joint condition between the bipolar lug and the steel shell 8 by the tension detection device provided by the embodiment is as follows:
when the battery cell 9 is of a monopole ear structure, setting the theoretical maximum bearing tension as the maximum tension value which can be born when the monopole ear welding meets the requirement; setting a theoretical maximum movable distance to be the maximum distance that the battery cell 9 can move relative to the steel shell 8 when the welding of the monopole lug meets the requirement; therefore, the clamping force and the preset distance are set according to the theoretical maximum bearing tension and the theoretical maximum movable distance, and the welding tension of the monopole lug is detected.
When the battery cell 9 is of a bipolar ear structure, setting the theoretical maximum bearing tension as the maximum tension value which can be born when the bipolar ear welding meets the requirement; setting a theoretical maximum movable distance to be the maximum distance that the battery cell 9 can move relative to the steel shell 8 when the bipolar lug welding meets the requirements; therefore, the clamping force and the preset distance are set according to the theoretical maximum bearing tension and the theoretical maximum movable distance, and the welding tension of the bipolar lug is detected. When the welding tension meets the requirement as a judgment result, namely no cold joint exists between the inner tab and the steel shell 8; when the welding tension does not meet the requirement as a judging result, the virtual welding exists between the inner tab and the steel shell 8 and/or the welding tension of the two tabs is unqualified, and the welding is judged to be unqualified at the moment.
The theoretical maximum bearing tension when the battery cell 9 is in a bipolar ear structure is larger than the theoretical maximum bearing tension when the battery cell 9 is in a monopolar ear structure; the theoretical maximum movable distance when the cell 9 is in the bipolar ear configuration is smaller than the theoretical maximum movable distance when the cell 9 is in the monopolar ear configuration.
The tension detecting device provided by the embodiment designs constant clamping force, drives the clamping mechanism 2 to move by a preset distance by using the moving mechanism 3, judges welding tension by using actual displacement, and can realize accurate detection. The spot bottom welding tension detection device provided by the embodiment adopts a high-precision position sensor and a pressure sensor 206, and realizes the accuracy of a tension detection procedure through constant clamping force of a test station and accurate position measurement; the device solves the problems of unwelded, cold joint, overselded and the like of an automatic welding tension detection station in automatic spot-welding equipment of a battery cell 9 of a steel shell 8, and improves the accuracy of welding tension online detection in the actual production process; the primary qualification rate of the product is improved, and the reworking rate is reduced; indirection also increases the performance requirements of the cell 9.
In the above embodiment, the tension detecting device is configured to detect a spot-bottom welding tension of the steel shell 8 of the battery cell 9, that is, the first workpiece is the steel shell 8, and the second workpiece is the battery cell 9; in other embodiments, the tension detecting device may also be used to detect welding tension of other welding processes, i.e. the specific types of the first workpiece and the second workpiece are not limited.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A tension detection apparatus for detecting a welding tension between a first workpiece and a second workpiece, the first workpiece and the second workpiece being in welded connection, the tension detection apparatus comprising:
a fixing mechanism for fixing the first workpiece;
the clamping mechanism is used for clamping the second workpiece, the clamping force detection assembly is arranged on the clamping mechanism and used for detecting the real-time clamping force of the clamping mechanism on the second workpiece, and the clamping mechanism is used for adjusting the clamping force applied to the second workpiece so that the real-time clamping force is kept stable;
the clamping mechanism is connected to the moving mechanism, and the moving mechanism is used for driving the clamping mechanism and the second workpiece to move relative to the first workpiece to carry out tension detection.
2. The tension sensing device of claim 1, wherein the real-time clamping force creates a static friction force on the second workpiece, the clamping mechanism being configured to adjust the clamping force applied to the second workpiece such that the static friction force is less than a theoretical maximum bearing tension between the first workpiece and the second workpiece;
the moving mechanism is used for moving a preset distance, and the preset distance is larger than the theoretical maximum movable distance of the second workpiece relative to the first workpiece;
and the tension detection device judges whether the welding tension meets the requirement according to the state of the first workpiece and/or the second workpiece after the moving mechanism moves.
3. The tension detecting apparatus according to claim 2, further comprising a distance detecting assembly for detecting an actual displacement amount of the second workpiece;
and the tension detection device judges that the welding tension meets the requirement when the actual displacement is smaller than or equal to the theoretical maximum movable distance.
4. The tension detecting device according to claim 1, wherein the fixing mechanism comprises a first driving structure and a fixing piece connected to the first driving structure, the first driving structure is used for driving the fixing piece to move up and down, the fixing piece is pressed on the first workpiece, and the fixing piece is provided with a hollowed-out part corresponding to the second workpiece.
5. The tension testing device of any one of claims 1-4, wherein the clamping mechanism comprises a second drive structure and a jaw assembly coupled to the second drive structure, the jaw assembly comprising two jaws, the second drive structure configured to drive the two jaws to move toward or away from each other, the clamping force testing assembly being disposed between the two jaws.
6. The tension testing device of claim 5, wherein the two jaw bodies are respectively provided with mounting grooves on opposite sides, the mounting grooves on the two jaw bodies are positioned correspondingly, and the clamping force testing assembly comprises a pressure sensor arranged at the mounting grooves.
7. The tension detecting device according to claim 5, wherein the second driving structure comprises a first motor, a bidirectional screw rod and a first transmission pair, the first motor is connected with the bidirectional screw rod, two sections of threads with opposite rotation directions are arranged on the bidirectional screw rod, the two sections of threads with opposite rotation directions are respectively connected with the first transmission pair in a threaded manner, and the two claw bodies are connected with the two first transmission pairs in a one-to-one correspondence manner.
8. The tension testing device of claim 7, wherein the second driving structure is mounted on a mounting plate, the mounting plate is connected to the moving mechanism, and a linear sliding rail structure is further arranged between the first transmission pair and the mounting plate.
9. The tension testing device of any one of claims 1-4, wherein the moving mechanism comprises a second motor, a unidirectional screw, and a second drive pair, the second motor is connected to the unidirectional screw, the unidirectional screw is threadably connected to the second drive pair, and the clamping mechanism is connected to the second drive pair.
10. A battery production line comprising a tension detecting device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222742214.9U CN218917041U (en) | 2022-10-18 | 2022-10-18 | Pulling force detection device and battery production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222742214.9U CN218917041U (en) | 2022-10-18 | 2022-10-18 | Pulling force detection device and battery production line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218917041U true CN218917041U (en) | 2023-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222742214.9U Active CN218917041U (en) | 2022-10-18 | 2022-10-18 | Pulling force detection device and battery production line |
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| Country | Link |
|---|---|
| CN (1) | CN218917041U (en) |
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2022
- 2022-10-18 CN CN202222742214.9U patent/CN218917041U/en active Active
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