CN114204226B - Tab pre-folding tool and tab pre-folding method - Google Patents

Abstract

The invention relates to the technical field of tab prefolding, and discloses a tab prefolding tool and a tab prefolding method. The lug pre-folding tooling includes: a fixed seat; a plurality of moving blocks, which are located on one side of the fixed seat and can form a round hole, and each moving block can move along the radial direction of the round hole; telescopic components are located on the fixed seat away from On one side of the moving block, the movable end of the telescopic assembly is connected to each moving block through a connecting line. When the movable end of the telescopic assembly is retracted inward, multiple moving blocks can move at the same speed along the radial direction of the circular hole toward the center of the circle. direction, and at the same time, the mobile block bends the tabs of the battery cells that are in contact with the mobile block. The lug pre-folding tool disclosed by the present invention realizes the synchronous movement of multiple moving blocks through the expansion and contraction of the telescopic assembly. When the distance from the center of the fixed seat to each moving block changes from large to small, the The tabs are bent with the push of the moving block, and the operation is simple.

Description

Tab pre-folding tooling and tab pre-folding method

technical field

The invention relates to the technical field of tab pre-folding, in particular to a tab pre-folding tool and a tab pre-folding method.

Background technique

With the pursuit of high-energy and high-rate performance of power batteries, multi-tab cells have emerged. At present, there are mainly two molding methods for multi-tab cells: one is kneading, and this molding method will A lot of metal shavings are produced, which will reduce the safety performance of the battery, thus affecting the use of the battery; the other is flattening. Before flattening, the tabs need to be pre-folded. If the tabs are not pre-bent The flattened tab will be bent multiple times. On the one hand, the bent tab will affect the welding effect, and on the other hand, it will increase the space occupied by the flattened tab. Therefore, there is an urgent need for a Tooling capable of pre-folding tabs before flattening.

Contents of the invention

Based on the above, the object of the present invention is to provide a tab pre-folding tooling and a tab pre-folding method, which solves the problem of pre-folding the tab before flattening the tab, and improves the tab after flattening. Excellent welding effect, reducing the space occupied by the flattened tabs.

For reaching above-mentioned purpose, the present invention adopts following technical scheme:

A tab pre-folding tool, comprising: a fixed seat; a plurality of moving blocks, located on one side of the fixed seat, the plurality of moving blocks can surround a circular hole centered on the center of the fixed seat, each Each of the moving blocks can move radially along the circular hole; the telescopic assembly is located on the side of the fixed seat away from the moving block, and the movable end of the telescopic assembly is connected to each of the moving blocks through a When the movable end of the telescopic assembly stretches out, a plurality of the moving blocks can move at the same speed along the radial direction of the circular hole in a direction away from the center of the circle; the movable end of the telescopic assembly moves toward When retracting, the plurality of moving blocks can move at the same speed along the radial direction of the circular hole toward the center of the circle, and at the same time, the moving blocks can bend extremely ear.

As a preferred solution of the tab pre-folding tool, the tab pre-folding tool also includes an elastic member, one end of the elastic member is connected to the fixed seat, and the other end of the elastic member is connected to the moving block , the elastic member can be compressed when the movable end of the telescopic assembly stretches out, and the elastic member can reset the moving block so that the movable end of the telescopic assembly can be retracted inward.

As a preferred solution of tab pre-folding tooling, the moving block is provided with a first cylindrical groove extending radially along the circular hole, and the fixed seat is provided with a groove facing the first cylindrical groove. The second cylindrical groove of the groove, one end of the elastic member extends into the first cylindrical groove and is connected with the moving block, and the other end of the elastic member extends into the second cylindrical groove and connected to the mount.

As a preferred solution of the lug pre-folding tooling, the moving block is a fan-shaped ring block, and a plurality of the moving blocks can be spliced to form an annular disc, and the inner hole of the annular disc is the circular hole.

As a preferred solution of the lug pre-folding tooling, the moving block is provided with rolling wheels, and the fixed base is provided with guide rails extending radially along the circular hole, and the rolling wheels can move along the guide rails. scroll.

As a preferred solution for tab pre-folding tooling, guide rollers are provided on the fixed seat, one end of the connecting wire is fixed on the moving block, and the other end of the connecting wire goes around the guide roller and The movable ends of the telescopic components are connected.

As a preferred solution of tab pre-folding tooling, the fixing seat is a first disc, and the telescopic assembly includes: a sleeve fixed on the fixing seat; a sliding piece, one end of which is slidably connected to the sleeve ; The second disc is arranged at the other end of the slider, and the connection lines connected with each of the moving blocks are fixed on the second disc.

As a preferred solution of the lug pre-folding tooling, the center of the fixed seat is provided with a bending groove and a plurality of positioning grooves communicating with the bending groove, each of the moving blocks is located in one of the In the positioning groove, the circular hole surrounded by a plurality of moving blocks is set facing the bending groove.

A tab pre-folding method, suitable for the tab pre-folding tool described in any of the above schemes, including:

The movable end of the telescopic assembly protrudes outwards, and the plurality of moving blocks move with the telescopic assembly at the same speed along the radial direction of the circular hole and move away from the center of the circle until reaching the center of the fixed seat increasing the distance value to each of said moving blocks to a first preset distance value;

Extending the tabs of the batteries into the pre-folded grooves surrounded by a plurality of moving blocks and attaching them to the moving blocks;

The movable end of the telescopic assembly is retracted inwardly, and the plurality of moving blocks move with the telescopic assembly at the same speed along the radial direction of the circular hole toward the center of the circle, and the moving blocks push the tabs Bending occurs, and at the same time, the distance from the center of the fixed seat to each of the moving blocks decreases.

As a preferred solution of the pre-folding method of the tab, the fixing seat is provided with a bending groove facing the round hole, and when the tab of the battery core is inserted into the pre-folding groove, the The end of the tab is spaced apart from the bottom wall of the bending groove.

The beneficial effects of the present invention are: the lug pre-folding tool disclosed by the present invention realizes the synchronous movement of multiple moving blocks through the expansion and contraction of the telescopic assembly, so that the distance value from the center of the fixed seat to each moving block changes. When the distance from the center of the seat to each moving block changes from large to small, the lugs in contact with the moving block will bend as the moving block pushes, thus realizing the pre-folding of the tabs of the battery. Adjusting the variation of the distance from the center of the fixed seat to each moving block can change the bending angle of the tab, which is easy to operate and greatly reduces the force of the tooling on the lateral cutting of the tab when pre-folding the tab, increasing the The yield rate of the pre-folded tabs solves the problem of pre-folding the tabs before flattening the tabs, improves the welding effect of the flattened tabs, and reduces the space occupied by the flattened tabs .

The tab pre-folding method disclosed by the invention is simple to operate and easy to implement, and realizes rapid bending of the tab of the electric core.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those skilled in the art, other drawings can also be obtained according to the content of the embodiment of the present invention and these drawings without any creative effort.

Fig. 1 is a schematic diagram of the moving block, rolling wheel and ring of the lug pre-folding tool provided by the specific embodiment of the present invention;

Fig. 2 is a top view of the tab pre-folding tool provided by the specific embodiment of the present invention in the first state;

Fig. 3 is a side view of the tab pre-folding tool provided by the specific embodiment of the present invention in the first state;

Fig. 4 is a top view of the tab pre-folding tool provided by the specific embodiment of the present invention in the second state;

Fig. 5 is a side view of the tab pre-folding tool provided by the specific embodiment of the present invention in the second state.

In the picture:

11. Fixing seat; 1101, second cylindrical groove; 1102, bending groove; 1103, positioning groove; 12, guide roller;

20. Round hole; 21. Moving block; 201. First cylindrical groove; 22. Rolling wheel; 23. Ring;

3. Telescopic component; 31. Sleeve; 32. Slider; 33. Second disk;

4. Connecting line;

5. Elastic parts.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only the technical solutions of the present invention. Some, but not all, embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance. Wherein, the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

This embodiment provides a tab pre-folding tool, as shown in Figures 1 to 5, including a fixed seat 11, twenty-four moving blocks 21 and a telescopic assembly 3, and the twenty-four moving blocks 21 are located on the sides of the fixed seat 11 On one side, twenty-four moving blocks 21 can surround a circular hole 20 centered on the center of the fixed seat 11, each moving block 21 can move radially along the circular hole 20, and the telescopic assembly 3 is located on the fixed seat 11 away from On one side of the moving block 21, the movable end of the telescopic assembly 3 is connected with each moving block 21 by a connection line 4. When the movable end of the telescopic assembly 3 stretches out, twenty-four moving blocks 21 can move along the same speed. The radial direction of the circular hole 20 moves away from the center of the circle; when the movable end of the telescopic assembly 3 is retracted inwardly, the twenty-four moving blocks 21 can move at the same speed along the radial direction of the circular hole 20 towards the direction of the center of the circle, At the same time, the moving block 21 can bend the tabs of the battery cells abutting against the moving block 21 . It should be noted that, in other embodiments of the present invention, the number of moving blocks 21 is not limited to twenty-four in this embodiment, and can also be other numbers, and these moving blocks 21 can be surrounded by a fixed base 11 The center of is the circular hole 20 of the center of circle, and the specific number of moving blocks 21 is set according to actual needs.

The lug pre-folding tooling of this embodiment is suitable for presetting the lugs of multi-lug cylindrical cells. The moving blocks 21 can move at the same speed along the radial direction of the circular hole 20 toward the direction away from the center of the circle. Twenty-four moving blocks 21 surround a similar circular pre-folding groove until the center of the fixed seat 11 reaches each moving block. The distance value of 21 is increased to the first preset distance value, and then the cylindrical battery core is clamped by the fixed tooling, so that the tabs at the end of the cylindrical battery core protrude into the pre-folding groove and fit with the moving block 21, and the telescopic assembly 3 The movable end of the movable end is retracted inward, and the twenty-four moving blocks 21 move along the radial direction of the circular hole 20 toward the center of the circle at the same speed with the telescopic assembly 3, and the moving blocks 21 push the tabs to bend, and at the same time, the fixed seat The distance from the center of 11 to each moving block 21 decreases until twenty-four moving blocks 21 enclose a circular hole 20, at which point the radius of the circular hole 20 decreases to a second preset distance value. By changing the first preset distance value and/or the second preset distance value, the difference between the two changes, that is, changing the moving distance of the moving block 21, so as to realize the change of the bending angle of the tab of the battery cell, To meet the needs of users to bend the tabs of the battery to different angles.

It should be noted that the above-mentioned fixing tooling belongs to the prior art, as long as it can clamp the cylindrical battery cell and fix the position of the cylindrical battery cell relative to the fixing seat 11, the fixing tooling can be obtained through outsourcing, and will not be repeated here. .

The lug pre-folding tooling provided in this embodiment realizes the synchronous movement of multiple moving blocks 21 through the expansion and contraction of the telescopic assembly 3, so that the distance value from the center of the fixed seat 11 to each moving block 21 changes. When the distance value is changed by When changing from large to small, the tabs in contact with the moving block 21 will be bent with the push of the moving block 21, thus realizing the pre-folding of the tabs of the battery cells. By adjusting the variation of the distance value, the poles can be changed. The bending angle of the lug is easy to operate. When pre-folding the tab, it greatly reduces the force of the tooling on the lateral cutting of the tab, increases the yield of the pre-folded tab, and solves the problem of flattening the tab before flattening the tab. The problem of pre-folding improves the welding effect of the flattened tab and reduces the space occupied by the flattened tab.

As shown in Figure 2 and Figure 4, the tab pre-folding tooling of this embodiment also includes an elastic member 5, which is a spring, one end of the elastic member 5 is connected to the fixed seat 11, and the other end of the elastic member 5 is connected to the movable The blocks 21 are connected, and the elastic member 5 can be compressed when the movable end of the telescopic assembly 3 stretches out, and the elastic member 5 can reset and move the block 21 so that the movable end of the telescopic assembly 3 can be retracted inwardly. That is to say, when the elastic member 5 is in the compressed state, the active force of the elastic member 5 on the moving block 21 is towards the center of the circular hole 20, once the force of the telescopic assembly 3 on the moving block 21 through the connecting wire 4 is removed, the elastic member 5 will The moving block 21 can be pushed to move along the radial direction of the circular hole 20 toward the center of the circle, so that the moving block 21 is reset. At this time, the distance from the center of the fixed seat 11 to each moving block 21 is the smallest, and twenty-four moving blocks 21 A round hole 20 is surrounded, and at the same time, the movable end of the telescopic assembly 3 connected to the moving block 21 through the connecting wire 4 resets.

Further, as shown in Figure 1, the moving block 21 of this embodiment is provided with a first cylindrical groove 201 extending radially along the circular hole 20, as shown in Figures 2 and 4, the fixed seat 11 is provided with Facing the second cylindrical groove 1101 of the first cylindrical groove 201, one end of the elastic member 5 extends into the first cylindrical groove 201 and is connected with the moving block 21, and the other end of the elastic member 5 extends into the second cylindrical groove 1101 and connected with the fixed seat 11, the first cylindrical groove 201 and the second cylindrical groove 1101 can play a guiding role during the compression of the elastic member 5 and the elongation of the elastic member 5, so that the length of the elastic member 5 is always along the The radial extension of the circular hole 20 ensures that the moving block 21 can move along the radial direction of the circular hole 20 . The diameter of the first cylindrical groove 201 of this embodiment, the diameter of the second cylindrical groove 1101 and the diameter of the elastic member 5 are all the same, and the depth of the first cylindrical groove 201 is the same as that of the second cylindrical groove 1101. A cylindrical groove 201 is located at the center of the side of the moving block 21 to ensure that the moving block 21 can move smoothly along the radial direction of the circular hole 20 under the push of the elastic member 5, reducing the inclination of the moving block 21 during the movement. crooked possibility.

As shown in Figures 2 and 4, the fixed seat 11 of this embodiment is a first disc, the moving block 21 is a fan-shaped ring block, and twenty-four moving blocks 21 can be spliced to form an annular disc, and the inner hole of the annular disc for circular holes. Specifically, the sector ring block in this embodiment is formed by dividing the ring disc into 24 equal parts. The center of the fixing seat 11 of this embodiment is provided with a bending groove 1102 and a plurality of positioning grooves 1103 communicating with the bending groove 1102, and the opening of each second cylindrical groove 1101 is set towards the positioning groove 1103, Each moving block 21 is located in a positioning groove 1103, and the pre-folding groove surrounded by twenty-four moving blocks 21 is set opposite to the bending groove 1102, and the positioning groove 1103 provided can be increased when bending the tab. The depth of the tab protruding into the positioning groove 1103 ensures the bending effect of the tab.

As shown in Fig. 1, Fig. 2 and Fig. 4, the moving block 21 of the present embodiment is provided with a rolling wheel 22, and the fixed seat 11 is provided with a guide rail (not shown) extending radially along the circular hole 20, The scroll wheel 22 can roll along the guide rail. Specifically, two rows of rolling wheels 22 are provided on each moving block 21 , and two rows of rolling wheels 22 can improve the smoothness of moving the moving block 21 on the fixed base 11 . In other embodiments, a slide rail extending radially along the circular hole 20 may also be provided on the fixed base 11 , and a slide groove corresponding to the slide rail is provided on the moving block 21 , so that the moving block 21 can slide along the slide rail.

In order to reduce the wear and tear on the connecting wire 4 of the fixing seat 11, as shown in Figures 2 to 5, the fixing seat 11 of this embodiment is provided with a guide roller 12, and one end of the connecting wire 4 is fixed on the moving block 21, and the connecting wire The other end of 4 walks around guide roller 12 and links to each other with the movable end of telescoping assembly 3. Each moving block 21 of the present embodiment is provided with two rings 23, and the rings 23 are located at the outer ring of the circular disk formed by the splicing of the moving blocks 21. The planes are parallel, one end of the connecting wire 4 is fixed on the ring 23 , and the other end of the connecting wire 4 bypasses the guide roller 12 and is fixedly connected with the movable end of the telescopic assembly 3 . It should be noted that the guide rollers 12 in Fig. 3 and Fig. 5 are not all drawn, but only the guide rollers 12 located at both ends of the fixing seat 11 when the lug pre-folding tool is viewed from the side.

As shown in Fig. 3 and Fig. 5, the telescopic assembly 3 of the present embodiment includes a sleeve 31, a slider 32 and a second disk 33, the sleeve 31 is fixed on the holder 11, and one end of the slider 32 is connected to the sleeve 31. Sliding connection, the second disc 33 is arranged on the other end of the sliding member 32 , and the connecting wire 4 connecting the second disc 33 with each moving block 21 is fixed on the second disc 33 . Specifically, the sleeve 31 is a cylinder, and the slider 32 includes a sliding shaft and a piston. The piston is fixed on one end of the sliding shaft and is connected with the sliding force of the cylinder. The pressure realizes that the sliding shaft and the piston drive the second disk 33 to move in the horizontal direction, so that the moving block 21 moves along the radial direction of the fixed seat 11 . In other embodiments, the structure of the telescoping assembly 3 is not limited to the limitation of this embodiment, and can also be a combined structure of a linear drive and a second disc 33, and the second disc 33 is arranged on the movable side of the linear drive. At the end, the linear drive member can be a hydraulic cylinder or an electric push rod, etc., which can be selected by those skilled in the art according to actual needs.

This embodiment also provides a tab pre-folding method, which is suitable for the tab pre-folding tool described in the above technical solution, including:

The movable end of the telescopic assembly 3 protrudes outwards, and a plurality of moving blocks 21 move with the telescopic assembly 3 at the same speed along the radial direction of the circular hole 20 toward the direction away from the center of the circle until the center of the fixed seat 11 reaches each moving block 21 The distance value of is increased to the first preset distance value;

Extend the tabs of the cell into the pre-folded groove surrounded by a plurality of moving blocks 21 and attach them to the moving blocks 21;

The movable end of the telescopic assembly 3 is retracted inwardly, and the plurality of moving blocks 21 move along the radial direction of the circular hole 20 toward the center of the circle at the same speed with the telescopic assembly 3. The moving blocks 21 push the tabs to bend, and at the same time, fix The distance from the center of the seat 11 to each moving block 21 decreases.

The tab pre-folding method provided in this embodiment is simple to operate and easy to realize, and realizes quick bending of the tab of the battery cell.

The fixing seat 11 of this embodiment is provided with a bending groove 1102 facing the round hole 20. When the tab of the battery cell is inserted into the pre-folding groove, the end of the tab is spaced from the bottom wall of the bending groove 1102. It is provided to prevent the end of the tab from rubbing against the bending groove 1102 to be damaged during the process of bending the tab.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (10)

1. Lug pre-folding frock, its characterized in that includes:

a fixed seat (11);

the movable blocks (21) are positioned on one side of the fixed seat (11), the movable blocks (21) can enclose a round hole (20) taking the center of the fixed seat (11) as a circle center, and each movable block (21) can move along the radial direction of the round hole (20);

the telescopic assembly (3) is positioned on one side of the fixed seat (11) deviating from the movable blocks (21), the movable end of the telescopic assembly (3) is connected with each movable block (21) through a connecting wire (4), when the movable end of the telescopic assembly (3) extends outwards, the plurality of movable blocks (21) can move at the same speed along the radial direction of the round hole (20) far away from the circle center, and the plurality of movable blocks (21) enclose a circular pre-folding groove until the distance value from the center of the fixed seat (11) to each movable block (21) is increased to a first preset distance value; the electrode lugs of the battery core extend into the pre-folding groove and are attached to the movable block (21); when the movable end of the telescopic assembly (3) is retracted inwards, the plurality of moving blocks (21) can move along the radial direction of the round hole (20) at the same speed towards the direction close to the circle center, meanwhile, the moving blocks (21) can bend the lugs of the battery cell which is in butt joint with the moving blocks (21), the distance value from the center of the fixed seat (11) to each moving block (21) is reduced until the plurality of moving blocks (21) enclose the round hole (20), at the moment, the radius of the round hole (20) is reduced to a second preset distance value, and the difference value between the first preset distance value and/or the second preset distance value is changed, so that the bending angle of the lugs of the battery cell is changed;

the center of the fixed seat (11) is provided with a bending groove (1102), and a pre-bending groove formed by the surrounding of the moving blocks (21) is opposite to the bending groove (1102).

2. The tab pre-folding tool according to claim 1, further comprising an elastic piece (5), wherein one end of the elastic piece (5) is connected with the fixing seat (11), the other end of the elastic piece (5) is connected with the moving block (21), the elastic piece (5) can be compressed when the movable end of the telescopic assembly (3) extends outwards, and the elastic piece (5) can reset the moving block (21) to enable the movable end of the telescopic assembly (3) to retract inwards.

3. The tab pre-folding tool according to claim 2, wherein the moving block (21) is provided with a first cylindrical groove (201) extending along the radial direction of the round hole (20), the fixed seat (11) is provided with a second cylindrical groove (1101) opposite to the first cylindrical groove (201), one end of the elastic piece (5) extends into the first cylindrical groove (201) and is connected with the moving block (21), and the other end of the elastic piece (5) extends into the second cylindrical groove (1101) and is connected with the fixed seat (11).

4. The tab pre-folding tool according to claim 1, wherein the moving block (21) is a sector annular block, a plurality of moving blocks (21) can be spliced to form an annular disc, and an inner hole of the annular disc is the round hole (20).

5. The tab pre-folding tool according to claim 1, wherein a rolling wheel (22) is arranged on the moving block (21), a guide rail extending along the radial direction of the round hole (20) is arranged on the fixed seat (11), and the rolling wheel (22) can roll along the guide rail.

6. The tab pre-folding tool according to claim 1, wherein a guide roller (12) is arranged on the fixed seat (11), one end of the connecting wire (4) is fixed on the moving block (21), and the other end of the connecting wire (4) bypasses the guide roller (12) and is connected with the movable end of the telescopic assembly (3).

7. The tab pre-folding tool according to claim 6, wherein the fixing base (11) is a first disc, and the telescopic assembly (3) comprises:

a sleeve (31) fixed on the fixed seat (11);

a slider (32) having one end slidably connected to the sleeve (31);

and a second disc (33) provided at the other end of the slider (32), and the connection line (4) connected to each of the moving blocks (21) is fixed to the second disc (33).

8. The tab pre-folding tool according to claim 1, wherein a plurality of positioning grooves (1103) communicated with the bending grooves (1102) are formed in the center of the fixing seat (11), each moving block (21) is located in one positioning groove (1103), and round holes (20) surrounded by the moving blocks (21) are opposite to the bending grooves (1102).

9. A tab pre-folding method, which is suitable for the tab pre-folding tool according to any one of claims 1 to 8, and comprises:

the movable end of the telescopic assembly (3) extends outwards, and the plurality of moving blocks (21) move along the radial direction of the round hole (20) along the direction away from the circle center at the same speed along with the telescopic assembly (3) until the distance value from the center of the fixed seat (11) to each moving block (21) increases to a first preset distance value;

extending the electrode lugs of the battery cells into a pre-folded groove surrounded by a plurality of moving blocks (21) and attaching the electrode lugs to the moving blocks (21);

the movable end of the telescopic assembly (3) is retracted inwards, the movable blocks (21) move along the radial direction of the round hole (20) towards the direction close to the circle center at the same speed along with the telescopic assembly (3), the movable blocks (21) push the lugs to bend, and meanwhile, the distance value from the center of the fixing seat (11) to each movable block (21) is reduced.

10. The method for pre-folding the tab according to claim 9, wherein the fixing base (11) is provided with a bending groove (1102) opposite to the round hole (20), and when the tab of the battery cell extends into the pre-folding groove, the end of the tab is spaced from the bottom wall of the bending groove (1102).

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