CN209578605U - Tab welding hold-down mechanism - Google Patents

Abstract

The utility model relates to a tab welding pressing mechanism, which is used for pressing the tab on the conductive connecting member during the welding process of the tab and the conductive connecting piece. The tab welding pressing mechanism comprises: a base, a Compression assembly and elastic support assembly. The pressing component is rotatably connected to the base, and the pressing component includes a pressing head for pressing the tabs against the conductive connecting piece. The elastic support assembly is used to elastically support the base and the pressing assembly, when the pressure head is pressed, the pressure head rotates relative to the base, and the elastic support assembly can be elastically deformed to An elastic support force is provided between the base and the pressing head. When welding the tabs and the busbars, the tab welding mechanism in the present application makes the tabs and the busbars fit perfectly, thereby improving the welding quality.

Description

Tab welding pressing mechanism

technical field

The utility model relates to the technical field of battery processing, in particular to a welding and pressing mechanism for tabs.

Background technique

New energy vehicles provide energy through power batteries. The battery module of the power battery is formed by connecting a number of single cells in series and parallel through conductive connectors.

Among them, the single cell is provided with tabs for conducting electricity, and the bus bar is a common conductive connector used to electrically connect the tabs on different single cells. Commonly, the connection methods of tabs and conductive connectors include welding, screwing and mechanical crimping. Among them, power batteries are divided into soft-pack batteries and hard-shell batteries according to the battery form. Soft-pack batteries have the characteristics of flexible design, light weight, low internal resistance, not easy to explode, many cycles, and high energy density. The energy density of the power battery is improved, and the gap between the cruising range and the fuel vehicle is further narrowed.

Since the battery module is composed of several single cells in series and parallel through conductive connectors, most of the soft pack batteries on the market are connected in series and parallel between the single cells through bus bars. Usually, when welding the tabs and the busbars, the tabs of several single cells are pressed together on the busbars by means of integral pressing. Due to the poor consistency of the soft pack battery, the positions and angles of the tabs that overlap the busbar after bending are different, which leads to these tabs not in the same plane, and the overall pressing method makes these tabs unable to be completely It is closely attached to the busbar, which leads to the problem of virtual welding, and finally leads to a poor welding effect.

Utility model content

Based on this, it is necessary to provide a tab welding pressing mechanism for the above technical problems.

A tab welding and pressing mechanism is used for pressing the tab on the conductive connector during the welding process of the tab and the conductive connector, and the tab welding and pressing mechanism comprises:

base;

a pressing assembly, rotatably connected to the base, the pressing assembly including a pressing head for pressing the tabs on the conductive connector; and

An elastic support assembly for elastically supporting the base and the pressing assembly, when the pressure head is pressed, the pressure head rotates relative to the base, and the elastic support assembly can be elastically deformed to An elastic support force is provided between the base and the pressing head.

In one of the embodiments, the pressing head is in the shape of an elongated bar, so that the tabs on one single cell can be pressed against the conductive connector.

In one embodiment, there are two groups of the elastic support components, which are respectively disposed on both sides of the pressing component and the rotating shaft of the base.

In one embodiment, the pressing assembly further includes a mounting piece, the mounting piece is rotatably connected to the base, and the pressing head is fixedly connected to the mounting piece.

In one embodiment, there is a gap between the mounting member and the base, and the elastic support component is disposed in the gap.

In one embodiment, both sets of the elastic support components are provided with a pre-pressure, and the pre-pressure value is greater than the gravity value of the pressing component.

In one of the embodiments, the indenter is made of red copper.

In one of the embodiments, the tab welding pressing mechanism further includes a torque feedback component, the torque feedback component is connected to the base, and the torque feedback component is used for driving the pressing component to move, so as to move the tab Press down on the conductive connector.

In one embodiment, the torque feedback assembly includes a servo drive unit, a screw movement unit and a guide unit, one end of the screw movement unit is connected to the servo drive unit, the other end is connected to the pressing assembly, the The servo drive unit is set with a maximum torque value, and the servo drive unit drives the pressing assembly to move along the guide unit through the screw motion unit. When the movement resistance of the servo drive unit reaches the maximum torque After the value is set, the servo drive unit stops driving the pressing assembly to move.

In one embodiment, the welding and pressing mechanism of the pole lug further includes a torque feedback component and a moving component, the base is fixed to the moving component, and the moving component is used to drive the pressing component to move to move the pole The ear is pressed against the conductive connector, and the torque feedback component is a force sensor provided on the pressing component.

Beneficial effects: the indenter presses on the product, the indenter rotates relative to the base according to the shape of the product surface, and elastically deforms through the elastic support component to provide elastic support between the base and the indenter, so that the tab welding pressure The tightening mechanism can adapt to the shape of the product surface, so that the tabs and busbars fit perfectly, which improves the welding quality.

Description of drawings

1 is a schematic diagram of the overall structure of a tab welding device in an embodiment of the application;

2 is a schematic structural diagram of a product position correction mechanism in a tab welding device according to an embodiment of the application;

3 is a schematic diagram of the state of a product in an embodiment of the application during welding;

4 is a schematic structural diagram of a product positioning mechanism of a tab welding device in an embodiment of the application;

5 is a schematic structural diagram of a welding mechanism of a tab welding device and a tab welding pressing mechanism in an embodiment of the application;

6 is a partial structural schematic diagram of a tab welding pressing mechanism of a tab welding device according to an embodiment of the application;

Fig. 7a and Fig. 7b are schematic diagrams of two different working states of the tab welding pressing mechanism shown in Fig. 6;

FIG. 8 is a schematic diagram of the state when the tab welding pressing mechanism of the tab welding device presses the product according to an embodiment of the application;

9 is a schematic structural diagram of a tab welding pressing mechanism of a tab welding device in another embodiment of the present application;

FIG. 10 is a schematic structural diagram of a torque feedback component of a tab welding device according to an embodiment of the present application.

Reference numerals: 10, product; 11, first side; 12, second side; 13, third side; 14, fourth side; 100, rack; 200, conveying mechanism; 210, guide rail assembly; 220, tray Component; 300, welding mechanism; 400, product position correction mechanism; 410, mounting plate; 420, first drive assembly; 431, first clamp finger; 432, second clamp finger; 440, second drive assembly; 450, gantry frame; 500, product positioning mechanism; 510, abutting plate; 520, third drive assembly; 521, output end; 522, servo motor; 523, screw slider mechanism; 600, tab welding and pressing mechanism; 610, Base; 620, pressing component; 621, pressing head; 6211, pressing surface; 622, mounting piece; 623, clearance; 630, elastic support component; 640, rotating shaft; 650, torque feedback component; 651, servo drive unit ; 652, screw motion unit; 6521, sliding block; 653, guide unit; 700, servo moving mechanism; 800, CCD positioning mechanism.

Detailed ways

In order to facilitate the understanding of the present utility model, the present utility model will be described more fully below with reference to the related drawings. The preferred embodiments of the present utility model are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure will be provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only.

As shown in FIG. 1 , FIG. 1 shows a schematic diagram of the overall structure of a tab welding device in an embodiment of the present application. The tab welding device includes a frame 100 , a conveying mechanism 200 , a welding mechanism 300 and a product position correction mechanism 400 . Among them, the frame 100 is used as a carrier for carrying each sub-mechanism of the tab welding device. The tab welding mechanism 300 is used for welding the tabs of the battery module to the conductive connector.

Among them, the battery module includes a number of single cells, the single cells are divided into positive and negative electrodes, and the tabs are metal conductors that lead out the positive and negative electrodes from the single cells. Several single cells are connected in series and parallel to form a battery module. The series-parallel connection between the single cells is connected by conductors. It is common to use the bus bar as a conductive connector, and the tabs on different single cells are electrically connected to the bus bar, thereby realizing the single cell. wear in parallel between.

Wherein, the conveying mechanism 200 is used for conveying products, and the products in this application refer to one or more of a battery module, a single cell, a tab, and a bus bar. The product position correction mechanism 400 is used to correct the position of the products in the conveying mechanism 200 to ensure that the products are placed in an accurate posture during welding. When the tabs are welded to the busbar by the welding mechanism 300, the welding position is accurate , and the product position correction mechanism 400 clamps the product during the welding process to prevent the product from moving during the welding process, so as to improve the stability of the welding process and the welding accuracy.

As shown in FIG. 2 , FIG. 2 is a schematic structural diagram of a product position correction mechanism 400 in one embodiment. The product position correction mechanism 400 includes a mounting plate 410 , a first drive assembly 420 , clamping fingers 431 , 432 and a second drive assembly 440 . The first driving assembly 420 is used to drive the mounting plate 410 to move up and down relative to the rack 100 . Both the second driving assembly 440 and the gripping fingers are disposed on the mounting plate 410 , and move up and down synchronously with the mounting plate 410 . The clamping fingers include a first clamping finger 431 and a second clamping finger 432 that are slidably mounted on the mounting plate 410 . For example, when the product moves on the conveying mechanism 200 to the position below the product position correcting mechanism 400, the positional accuracy of the product on the conveying mechanism 200 is low. During welding, the welding mechanism 300 is prone to misalignment of the welding position, resulting in welding deviation. The first driving assembly 420 drives the mounting plate 410 to descend and approach the product, the second driving assembly 440 drives the first clamping finger 431 and the second clamping finger 432 to move to the middle synchronously and move closer together, the first clamping finger 431 and the second clamping finger 432 It is close to and clamped on both sides of the product, so as to move the product on the conveying mechanism 200 to the middle of the product position correcting mechanism 400 .

In one embodiment, referring to FIG. 2 , the product position correction mechanism 400 includes a gantry 450 mounted on the rack 100 . Optionally, the rack 100 is provided with two product position correction mechanisms 400 , that is, extremely The ear welding device can include two welding stations, and during welding, the two welding stations perform welding at the same time, which greatly improves the work efficiency.

In one of the embodiments, both the first drive assembly 420 and the second drive assembly 440 are air cylinders. The air cylinder has the advantages of fast response speed and stable clamping force. When the product position correction mechanism 400 is working, it can ensure fast response and improve work efficiency. Specifically, the second driving assembly 440 may be a bidirectional cylinder, the bidirectional cylinder has two output ends that move in opposite directions, the first clamping finger 431 and the second clamping finger 432 are respectively installed on the two output ends, when the second driving When the assembly 440 is working, the first clamping finger 431 and the second clamping finger 432 can approach and move away synchronously. The first clamping finger 431 and the second clamping finger 432 synchronously move toward the middle to clamp the product, which can ensure that the product can be accurately fixed in the middle of the product position correction mechanism 400 after the position correction, so that the welding structure can accurately find the position of the product. Position of welding.

In some embodiments, the second driving assembly 440 may also be a lead screw controlled by a servo motor. The lead screw has two opposite threads, and the two segments of the lead screw are respectively connected with moving blocks. When the servo motor drives the lead screw to rotate When , the two moving blocks can approach and move away synchronously with respect to the screw rod, and the first clamping finger 431 and the second clamping finger 432 are respectively fixed on the two moving blocks.

Referring to FIG. 3 , FIG. 3 is a schematic diagram of the state of the product 10 during welding in one embodiment. The product 10 includes a first side 11 , a second side 12 , a third side 13 and a fourth side 14 , and the first clamping finger 431 is against the Holding on the second side 12 of the product 10, the second clamping finger 432 abuts against the fourth side 14 of the product 10, so that the position of the product 10 is corrected to the middle of the product position correction mechanism 400. During the welding process, the first clamp The fingers 431 and the second clamping fingers 432 always hold the product 10 to prevent the product from being deviated in posture or position during the welding process.

Referring to FIG. 1 , the tab welding device further includes a product positioning mechanism 500 and a tab welding pressing mechanism 600 (see FIG. 3 ). 3 , during welding, the product positioning mechanism 500 abuts against the third side 13 of the product 10 , and the tab welding pressing mechanism 600 presses the product from the first side 11 of the product 10 , that is, through the tab welding pressing mechanism 600 compresses the tabs and the busbars, and then welds the product 10 on the first side 11 of the product 10 through the welding mechanism 300 to realize the connection of the tabs and the busbars. In some embodiments, the tabs are arranged on both sides of the battery module, that is, the first side 11 and the third side 13 of the battery module are both provided with tabs. At this time, after welding the tabs on the first side 11 Afterwards, the product is rotated by 180° to realize the welding of tabs and busbars on the third side 13 of the product. By arranging the product positioning mechanism 500, the product positioning mechanism 500 is pressed against the third side 13 of the product, so as to prevent the product from moving and offset when the tab welding pressing mechanism 600 approaches the product and presses against the product.

Specifically, referring to FIG. 4 , FIG. 4 is a schematic structural diagram of a product positioning mechanism 500 in one embodiment. Product positioning mechanism 500 includes abutment plate 510 and third drive assembly 520 . The third driving assembly 520 is used for driving the abutting plate 510 to move relative to the frame 100 to abut against the third side 13 of the product 10 , and then the tab welding and pressing mechanism 600 approaches and abuts against the first side 11 of the product . The first drive assembly 420 , the second drive assembly 440 and the third drive assembly 520 all include an output end for linear motion, and the abutting plate 510 is fixed on the output end 521 of the third drive assembly 520 . In one embodiment, the third driving assembly 520 includes a servo motor 522 and a screw-slider mechanism 523 driven by the servo motor 522 . The block moves in a straight line, and the abutting plate 510 is connected to the slider (ie, the output end 521 ), and moves closer to or away from the product under the drive of the slider. When the product moves under the product position correction mechanism 400, the third driving component 520 drives the abutting plate 510 to approach the product and abut the product, and then the tab welding and pressing mechanism 600 is pressed on the product, thereby realizing Position correction of products and clamping before welding. In some embodiments, the third drive assembly 520 may also be an air cylinder or a hydraulic cylinder.

As shown in FIG. 5 , FIG. 5 is a schematic structural diagram of the welding mechanism 300 and the tab welding pressing mechanism 600 in one embodiment. Referring to FIG. 3 , during welding, the product 10 is preferably pressed on the product 10 by the tab welding and pressing mechanism 600 to realize the positioning of the product 10 , and then the product 10 is welded by the welding mechanism 300 .

As shown in FIG. 6 , FIG. 6 is a partial structural schematic diagram of a tab welding pressing mechanism 600 in one embodiment. During the welding process, the tab welding pressing mechanism 600 is used to press the tab on the conductive connector. The tab welding pressing mechanism 600 includes a base 610 , a pressing component 620 and an elastic supporting component 630 . Wherein, the pressing component 620 is rotatably connected to the base 610, and the pressing component 620 includes a pressing head 621 for pressing the tabs against the conductive connecting piece. 7a and 7b are schematic diagrams of two different working states of the tab welding and pressing mechanism 600 shown in FIG. 6, respectively. Due to the different positions and angles of the tabs on the product 10 that overlap the bus bars after bending, these tabs are no longer in the same plane, and are connected to the base 610 through the pressing assembly 620 in rotation, so that the pressing The assembly 620 can be adjusted according to the specific shape and position of the tabs to ensure that the pressing assembly 620 can contact the tabs on the product. The elastic support component 630 is used to elastically support the base 610 and the pressing component 620. When the pressure head 621 is pressed, the pressure head 621 rotates relative to the base 610, and the elastic support component 630 can be elastically deformed, so that the base 610 and the pressure head 621 can be elastically deformed. Provide elastic support in between.

For example, the elastic support component 630 may be a spring or other part with a certain elastic support force. In one embodiment, referring to FIG. 7a and FIG. 7b , there may be two elastic support assemblies 630, which are respectively disposed on both sides of the pressing assembly 620 and the rotating shaft 640 of the base 610, and two elastic support assemblies 630 of each elastic support assembly 630. The ends are respectively fixed to the base 610 and the pressing assembly 620 . Of course, both ends of each elastic support component 630 may also only be supported on the base 610 and the pressing component 620 .

For another example, a group of elastic support components 630 may also be provided. For example, a group of elastic support components 630 is provided at one end of the rotation shaft 640 of the pressing component 620 and the base 610, and the two ends of the elastic support component 630 are respectively fixed to the base 610 and the pressing component 610. Tighten assembly 620.

For another example, the rotatable connection between the pressing component 620 and the base 610 can be understood as the pressing component 620 in the above embodiment is rotatably connected to the base 610 through the solid rotating shaft 640, and can also be understood as the pressing component 620 and the base There are virtual reels between 610. For example, the pressing component 620 and the base 610 are only physically connected by the elastic supporting component 630 , and there is no solid rotating shaft 640 . The relative rotation between the pressing component 620 and the base 610 is realized by the elastic deformation of the elastic supporting component 630 . .

In the embodiment in which the elastic support assemblies 630 are respectively provided on both sides of the rotating shaft 640 , the elastic support assemblies 630 are provided with pre-pressure. The value of the pre-pressure is greater than the gravity value of the pressing assembly 620 . When the tab welding and pressing mechanism 600 moves along the horizontal plane in the posture shown in FIG. 7a to clamp the product, under the gravity of the pressing component 620, the pressing component 620 will rotate downward relative to the rotating shaft 640, By setting the value of the pre-pressure of the elastic support component 630 to be greater than the gravity of the pressing component 620, the tab welding pressing mechanism 600 can maintain a horizontal state when the product is not pressed, that is, the use of the pressing head 621 The pressing surface 6211 of the pressed product 10 is kept vertical. In some embodiments, the tab welding pressing mechanism 600 can also move in a vertical direction to compress the product 10, and at this time, the pressing surface 6211 is substantially on a horizontal plane. During operation, the tab welding and pressing mechanism 600 adapts to the position of the tab according to the different positions of the tabs on the product, and the pressing assembly 620 uses the rotating shaft 640 as a reference to adapt to the position of the tab to ensure that the indenter 621 and the tab are to the greatest extent possible. At this time, the elastic support component 630 plays the role of flexibly adapting to the inclination angle of the tabs.

As shown in FIG. 8 , FIG. 8 shows a state schematic diagram of the tab welding pressing mechanism 600 pressing the product 10 in one embodiment. Product 10 is a soft-pack battery, and the soft-pack battery is composed of several single cells arranged in a horizontal direction. The left and right sides of each cell are provided with tabs. The indenter 621 is elongated. The elongated pressing head 621 can press the tabs on one single cell at a time. If the tabs on one side of the one-time integral soft-pack battery are pressed tightly, the tabs of some single cells may not be pressed because the shape and position of the tabs on each single cell may be different. . During welding, the tab on a single cell is pressed against the bus bar by the tab welding and pressing structure, and then the tab and the bus bar are welded by the welding mechanism 300; then the tab welding pressing mechanism 600 is used. Transfer and press the tabs on another single cell, thus completing the welding of the tabs and busbars on the entire pouch battery in turn.

In some embodiments, referring to FIG. 6 , the pressing assembly 620 further includes a mounting member 622 , the mounting member 622 is rotatably connected to the base 610 , and the pressing head 621 is fixedly connected to the mounting member 622 . Optionally, referring to FIG. 7 a , there is a gap 623 between the mounting member 622 and the base 610 , and the elastic support component 630 is disposed in the gap 623 . Referring to FIG. 9, FIG. 9 shows a schematic structural diagram of the tab welding and pressing mechanism 600 in another embodiment. In FIG. 9, there is no gap between the mounting member 622 and the base 610, and the two ends of the elastic support component 630 are respectively Fixed on the base 610 and the mount 622 .

In some embodiments, the indenter 621 is made of red copper. Due to the high instantaneous temperature during the compression welding process. The indenter 621 presses the tabs and the busbar in close contact. Since red copper has good thermal conductivity, its heat dissipation effect is better, which ensures the quality and effect of welding.

Referring to FIG. 5 , in some embodiments, the tab welding pressing mechanism 600 further includes a torque feedback assembly 650 , the torque feedback assembly 650 is connected to the base 610 , and the torque feedback assembly 650 is used to drive the pressing assembly 620 to move to press the tabs tighter than the conductive connector. For example, referring to FIG. 10 , FIG. 10 is a schematic structural diagram of the torque feedback assembly 650 in one embodiment. The torque feedback assembly 650 includes a servo drive unit 651 , a screw motion unit 652 and a guide unit 653 . One end of the screw moving unit 652 is connected to the servo drive unit 651 through a gear transmission structure, and one end of the sliding block 6521 of the screw moving unit 652 is connected to the pressing component 620 . Specifically, the sliding block 6521 is connected to the pressing component 620 through the base 610 . The servo drive unit 651 can be, for example, a servo motor. In addition to outputting torque, the servo motor can also receive feedback torque, that is to say, the resistance of the movement of the sliding block 6521 can be received by the servo motor. The servo drive unit 651 is set with a maximum torque value. The servo drive unit 651 drives the pressing component 620 to move along the guide unit 653 through the screw movement unit 652. When the pressing head 621 of the pressing component 620 presses against the product, it slides The motion resistance on the block 6521 will rise sharply. When the motion resistance of the sliding block 6521 is greater than the maximum torque value set by the servo drive unit 651, the servo drive unit 651 stops driving the pressing component 620 to move, and the pressing component 620 presses stably. The force remains pressed against the product. Due to the low mechanical strength of the soft-pack battery, the pressing force of the pressing element 620 on the product can be controlled by the torque feedback component 650, thereby preventing the soft-pack battery from being deformed and damaged by a large pressing force.

In other embodiments (not shown), the tab welding pressing mechanism includes a moving component and a torque feedback component. The torque feedback component in this embodiment may be a force sensor, and the force sensor is disposed on the pressing component 620 . The moving assembly is, for example, a three-axis servo moving assembly. The moving assembly is disposed on the frame 100 , and the moving assembly is used to drive the pressing assembly 620 to move relative to the frame 100 to press the tabs against the conductive connectors.

In some embodiments, referring to FIG. 5 , the tab welding device includes a servo moving mechanism 700 , wherein the servo moving mechanism 700 can be used as the moving component in the above-mentioned embodiments. The servo moving mechanism 700 is a three-axis translation device, which can drive the driven member to move on three axes of XYZ. The tab welding device further includes a CCD positioning mechanism 800 . The CCD positioning mechanism 800 , the tab welding pressing mechanism 600 and the welding mechanism 300 are all arranged on the servo moving mechanism 700 . The CCD positioning mechanism 800 is used to detect the position information of the welding part of the product, and the servo moving mechanism 700 is used to drive the welding mechanism 300 to perform welding on the welding part of the product according to the position information. During welding, the product on the conveying mechanism 200 is positioned by the CCD positioning mechanism 800 to ensure the accuracy of the pressing position of the product position correction mechanism 400 and the accuracy of the welding position of the welding mechanism 300 to prevent the occurrence of pressure deviation or welding deviation. Phenomenon.

In some embodiments, referring to FIG. 1 , the conveying mechanism 200 includes a rail assembly 210 disposed on the rack 100 and a tray assembly 220 moving along the rail assembly 210 . The conveying mechanism 200 further includes a lifting and rotating assembly (not shown in the figure), and the lifting and rotating assembly is arranged below the product position correction mechanism 400. When the tray assembly 220 moves under the product position correction mechanism 400, the lifting and rotating assembly moves the tray. The assembly 220 is jacked up, and then the positioning, clamping and welding processes are performed to prevent the tray assembly 220 from moving relative to the guide rail assembly 210 during the positioning, clamping and welding. After welding the tabs on one side of the product, the lifting and rotating assembly rotates the tray assembly 220 by 180°, and then continues the positioning, clamping and welding process.

In some embodiments, the jacking and rotating assembly may include, for example, a cylinder or a rotating assembly disposed on the top of the cylinder, and the rotating assembly includes a rotating disk and a motor, and the electric motor is used to drive the rotating disk to rotate. The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present utility model, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the utility model patent. It should be pointed out that for those of ordinary skill in the art, some modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for this utility model shall be subject to the appended claims.

Claims (10)

1. a kind of tab welding hold-down mechanism, in tab and conducting connecting part welding process, tab to be pressed on conduction On connector, which is characterized in that the tab welding hold-down mechanism includes:

Pedestal；

It holds down assembly, is rotationally connected with the pedestal, it is described to hold down assembly including for tab to be pressed in conducting connecting part Pressure head；And

Resilient support assemblies, for flexibly support the pedestal and it is described hold down assembly, it is described when the pressure head is under pressure Relative to the base rotation, the resilient support assemblies elastic deformation can occur for pressure head, in the pedestal and the pressure Elastic anchorage force is provided between head.

2. tab welding hold-down mechanism according to claim 1, which is characterized in that the pressure head is strip, so that one Tab in a single battery core is pressed on conducting connecting part.

3. tab welding hold-down mechanism according to claim 1, which is characterized in that the resilient support assemblies have two groups, And it is separately positioned on the two sides to hold down assembly with the rotation axis of the pedestal.

4. tab welding hold-down mechanism according to claim 3, which is characterized in that described hold down assembly further includes installation Part, the installation part are rotationally connected with the pedestal, and the pressure head is fixedly connected on the installation part.

5. tab welding hold-down mechanism according to claim 4, which is characterized in that between the installation part and the pedestal With gap, the resilient support assemblies are set in the gap.

6. tab welding hold-down mechanism according to claim 3, which is characterized in that resilient support assemblies described in two groups are all provided with It is equipped with precompression, the precompressed force value is greater than the gravity value to hold down assembly.

7. tab welding hold-down mechanism described in -6 any one according to claim 1, which is characterized in that the pressure head is by red copper It is made.

8. tab welding hold-down mechanism described in -6 any one according to claim 1, which is characterized in that the tab welding pressure Tight mechanism further includes torque-feedback component, and the torque-feedback component connects the pedestal, and the torque-feedback component is for driving The dynamic movement that holds down assembly, is pressed in conducting connecting part for tab.

9. tab welding hold-down mechanism according to claim 8, which is characterized in that the torque-feedback component includes servo Driving unit, screw rod moving cell and pilot unit, screw rod moving cell one end connect the servo drive unit, another It holds down assembly described in the connection of end, the servo drive unit is set with maximum moment value, and the servo drive unit passes through described It holds down assembly described in the driving of screw rod moving cell and is moved along the pilot unit, when the resistance of motion of the servo drive unit After reaching the maximum moment value, the servo drive unit stops the movement that holds down assembly described in driving.

10. tab welding hold-down mechanism described in -6 any one according to claim 1, which is characterized in that the tab welding Hold-down mechanism further includes torque-feedback component and moving assembly, and the pedestal is fixed on the moving assembly, the moving assembly For driving the movement that holds down assembly tab is pressed in conducting connecting part, the torque-feedback component is set on the pressure Force snesor on tight component.