Battery composed of cells with spliced tabs, tooling and method of use

Abstract

The application discloses a battery composed of battery cells with spliced connecting pieces, a tool and a use method, and aims to solve the problem that a long tab needs to be arranged during the connection of the battery cell with a pole, and the excess part needs to be cut after welding, thus causing an additional process and waste. The application comprises two battery cells and a top cover, the tabs of the battery cells are fixedly connected with connecting pieces, the two connecting pieces are oppositely arranged and the edges of the opposite edges are attached, and the connecting pieces are welded with the pole of the battery top cover. The spliced connecting piece can save the length of the tab during the connection with the battery cell, and the operation of removing the excess part after welding is cancelled.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery production, more particularly, it relates to a battery composed of battery cells with spliced tabs, tooling and method of use. BACKGROUND

[0002] The functional components of a battery include battery cells, tabs and poles, the battery cells draw current through the tabs, and the tabs are electrically connected to the poles, and the current is generated after the poles of the battery and the load form a closed loop.

[0003] A battery generally has two battery cells, and both battery cells have tabs. Currently, the related technology generally uses an integral tab to weld with two oppositely arranged tabs of the same polarity.

[0004] Chinese Patent No. CN216462755U, entitled "A super-welding machine tab battery cell positioning device", discloses a super-welding machine tab battery cell positioning device, which includes a support frame, an electric cell positioning mechanism, a driving mechanism for driving the electric cell positioning mechanism to move, and a pressure head mechanism for fixing the tab. The electric cell is arranged in the limiting space formed by the electric cell positioning mechanism, and the pressure head mechanism is arranged on one side of the electric cell positioning mechanism. The electric cell positioning mechanism includes a limiting plate, and the driving mechanism includes a horizontal cylinder for driving the limiting plate to move. Each limiting plate corresponds to a horizontal cylinder, and three limiting plates form a U-shaped structure. The U-shaped structure and the pressure head mechanism form a limiting space for placing the electric cell.

[0005] The disadvantage of this method is that in order to weld the tabs and the tabs, a longer tab needs to be prepared, and after welding, the excess part of the tab needs to be cut off. In order to reduce the waste of this part of the process, the present application aims to realize a battery composed of battery cells with spliced tabs and tooling to reduce the consumption of tabs and reduce costs. SUMMARY

[0006] The present application overcomes the shortcomings of the current battery cells in the connection process with the poles, which requires a longer tab to be set, and the excess part needs to be cut after welding, resulting in additional processes and waste. The present application provides a battery composed of battery cells with spliced tabs, tooling and method of use, which only needs a shorter tab and does not need to be cut after welding, saving processes and reducing tab waste.

[0007] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0008] A battery composed of battery cells with spliced tabs, including two battery cells and a top cover, the tabs of the battery cells are fixedly connected with tabs, the two tabs are oppositely arranged and the edges of the opposite edges are fitted, and the tabs are welded and connected with the poles of the battery top cover.

[0009] The internal structure of the double-cell battery is as follows: the double cells are connected with the positive and negative poles through the two pole lugs respectively, and then the positive poles of the two cells are connected with each other through two connecting pieces, and the negative poles are connected with each other, and then the connecting pieces are welded with the pole columns. The existing connecting piece is an integral structure, and the two ends thereof are connected with the corresponding pole lugs of the cells. This method requires that the pole lug be long, so that the pole lug can be hung on the welding plane in the flat state of the cell. For the wider type of cell, the pole lug needs to be longer. Since the corresponding pole lugs of the two cells need to be connected at the same time, the pole lug also needs to be wide, so that the connecting piece can be reliably stacked on the pole lug, which will generate an unstacked area of the pole lug, and this part needs to be cut off. On the basis of the above, the application provides a battery of a cell using a spliced connecting piece. The pole lugs of the two cells are connected with a connecting piece respectively, and then the two connecting pieces are butted and welded with the pole column, so that the two connecting pieces are fixedly connected with the pole column respectively. The abutting of the opposite edges of the two connecting pieces is conducive to expanding the contact area between the connecting piece and the pole column, so that it is similar to the non-spliced connecting piece in the contact area and has similar electrical performance. The above structure saves materials and processes without losing electrical performance.

[0010] As a preferred, the spliced joint formed by the two connecting pieces is linear. The opposite edges of the two connecting pieces are straight edges, and the opposite edges of the two connecting pieces are complementary.

[0011] As a preferred, the welding areas of the two connecting pieces and the pole column are the same. This structure divides the current passing through the two connecting pieces, avoiding the situation that the local overcurrent is too large to cause the fuse to be blown.

[0012] A welding tool for a battery composed of a spliced connecting piece of a cell, comprising a positioning part for positioning two cells and a top cover, and a welding part provided above the jig table, the welding part is provided with a welding pressure nozzle, the welding pressure nozzle is abutted on the two connecting pieces, and the welding pressure nozzle and the connecting pieces form a sealed cavity, and the welding part is provided with a negative pressure mechanism for vacuumizing the sealed cavity to collect foreign matters.

[0013] The positioning part of the welding tool is used for positioning the battery cell. Since the tabs on the battery cell and the corresponding connecting pieces are fixed by ultrasonic or laser welding in the previous process, the good products generated in the previous process will be naturally in the edge fitting state if they are well positioned and the connecting pieces are unfolded. Therefore, the tool only needs to be positioned and positioned to achieve the precision requirement of the edge fitting of the two connecting pieces. The advantage of indirectly positioning the battery cell compared to directly positioning the connecting piece is that the connecting piece itself has a certain flexibility and weak bending resistance. Directly positioning and welding the connecting piece may cause the connecting piece not to be completely unfolded, which may cause stress concentration. In the subsequent use process, the temperature rise of the battery and the corrosion of the electrolyte may cause the connecting piece to be easily detached, affecting the service life of the battery. The welding part mainly includes a welding pressure nozzle for positioning the connecting piece. The welding pressure nozzle is performed after the positioning of the positioning part. The downward pressure of the welding pressure nozzle will generate a sealed cavity with the connecting piece, separating the welding area from the non-welding area. The welding material and foreign matter generated in the welding area will not enter the non-welding area, especially the battery cell position. The sealed cavity is also conducive to using negative pressure means to suck out the welding material and foreign matter therein, keeping the inside of the quasi-assembled battery clean, thereby improving the consistency and reliability of the battery.

[0014] As a preferred, the welding pressure nozzle comprises a pressure nozzle mounting plate, an inner pressure nozzle and an outer pressure nozzle elastically connected to the pressure nozzle mounting plate, the outer pressure nozzle is sleeved outside the inner pressure nozzle, the pressure nozzle mounting plate is provided with a vertically arranged guide hole, the inner pressure nozzle is provided with a guide column, and the guide column and the guide hole are in sliding fit. The outer pressure nozzle and the inner pressure nozzle bear the functions of positioning the two connecting pieces and forming the sealed cavity. The outer pressure nozzle adopts elastic connection, which is to match the different thicknesses of the positive and negative connecting pieces, improve the compatibility, and also reduce the precision requirement of the tool assembly.

[0015] As a preferred, the welding part further comprises a distance sensor for detecting the distance. The distance sensor is electrically connected to the corresponding driving structure, the driving structure controls the lifting of the welding pressure nozzle, and through the control of the distance sensor, the collision between the welding part and the battery cell is avoided.

[0016] As preferred, the positioning part comprises a positioning plate and a containing plate, the positioning plate is provided with a plurality of positioners near the outer edge position, the positioners comprise fixed positioners and adjustable positioners, the fixed positioners and the adjustable positioners are respectively arranged at opposite positions of the positioning plate, and the two ends in the length direction and the two ends in the width direction of the containing plate respectively abut against the positioners. The positioning plate positions the containing plate, for the welding tool, the positioning plate is relatively fixed, and the containing plate is relatively movable, which is beneficial to the access to the assembly line conveyor belt. The two ends of the containing plate can have handles to improve portability. The positioning plate has positioners for positioning the battery cell. The fixed positioners and the adjustable positioners are arranged opposite to each other on the two sides in the length direction and the width direction of the containing plate. One end of the containing plate abuts against the fixed positioner, and the other end is adjusted by the adjustable positioner and abuts against the containing plate, so as to realize the positioning of the containing plate. The adjustable positioner can comprise a positioner base fixed on the positioning plate and a positioner abutting block threadedly connected to the positioner base. The positioner abutting block is telescopic by rotating the threaded shaft of the positioner abutting block. Alternatively, the positioner abutting block is connected to the positioner base in a telescopic manner by applying air pressure or hydraulic pressure to the positioner base, and the pressure is converted into the pressure of the positioner abutting block abutting against the containing plate.

[0017] As preferred, the center position of the containing plate is provided with a top cover support passing hole, the corresponding position of the positioning plate is fixedly connected with a top cover support, and part of the outer edge of the top cover support extends upward to form a limiting flange, and the outer edge of the top cover abuts against the limiting flange. The above structure improves the positioning mode of the battery top cover. The upwardly arranged bottom surface of the battery top cover is arranged at a position corresponding to the middle positions of the two battery cells and is also the middle position of the containing plate. The limiting flange limits the length and width directions of the battery top cover, and only allows the battery top cover to move away from the containing plate in the vertical direction.

[0018] As preferred, a plurality of limiting guide pieces are symmetrically installed on the left and right sides of the containing plate, and the three side surfaces of the battery cell abut against the limiting guide pieces, and the other side surface abuts against the limiting flange. The limiting guide piece has a bending section which is outwardly bent to reduce the difficulty of the battery cell entering.

[0019] A use method of a welding tool of a battery composed of a plurality of battery cells connected by a spliced tab, comprising the following steps:

[0020] S1: positioning the battery cell and the top cover by the positioning part;

[0021] S2: lowering the welding part to abut against the tab by the welding nozzle;

[0022] S3: welding a plurality of welding sections, and the total length of the welding sections is more than 60 mm;

[0023] S4: drawing negative pressure on the sealed cavity formed by the welding nozzle and the mounting plate for a period of time;

[0024] S5: moving up the welding part, taking out the integrated battery cell and top cover from the tooling.

[0025] Through the above steps, good positioning of the spliced connecting piece and separation welding can be realized, and in this process, the foreign matter is absorbed, the reliability and consistency of the battery are improved, and the yield of the battery is improved.

[0026] Compared with the prior art, the beneficial effects of the present application are: (1) the spliced connecting piece can save the length of the tab in the process of connecting with the battery cell, cancel the operation of deleting the excess part after welding, reduce the cost and steps; (2) the tooling separates the welding area and the non-welding area by using the welding pressure nozzle during welding, and removes the foreign matter generated during welding by forming a sealed cavity to support the negative pressure suction form, thereby maintaining the good performance of the battery and improving its reliability. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the front view of the present application;

[0028] Figure 2 is the exploded view of the present application;

[0029] Figure 3 is a structural schematic view of the welding protruding nozzle of the present application;

[0030] Figure 4 is a sectional view of the welding protruding nozzle of the present application;

[0031] Figure 5 is a structural schematic view of the positioning part of the present application;

[0032] Figure 6 is a sectional view of another embodiment of the welding protruding nozzle.

[0033] In the drawings:

[0034] Battery cell 1, top cover 2, tab 3, connecting piece 4, welding pressure nozzle 5, pressure nozzle mounting plate 6, inner pressure nozzle 7, outer pressure nozzle 8, guide hole 9, guide column 10, distance sensor 11, positioning plate 12, supporting plate 13, fixed positioner 14, adjustable positioner 15, top cover support through hole 16, top cover support 17, limiting flange 18, limiting guide 19, spring column 20, upper top plate 21, pole column 22, pad 23, pressure relief hole 24. DETAILED DESCRIPTION

[0035] The present disclosure will be further described below in conjunction with the drawings and examples.

[0036] Example 1:

[0037] A battery composed of a battery cell 1 with a spliced connecting piece 4, as shown in Figure 5As shown, including two electric core 1 and top cover 2, the tab 3 of electric core 1 is fixedly connected with the connecting piece 4, specifically, the tab 3 is connected with the connecting piece 4 by welding means, wherein the welding can adopt laser welding or ultrasonic welding, in the specific application process, the ultrasonic welding means is preferred. The two connecting pieces 4 are oppositely arranged and the edges of the opposite edges are fitted, the connecting piece 4 is welded with the pole 22 of the battery top cover 2, the root of the pole 22 is rectangular, and the root of the pole 22 is welded with the two connecting pieces 4. The connecting piece 4 has a plurality of recesses for the part connected with the root of the pole 22, which is suitable for laser welding.

[0038] The tab 3 of the two electric core 1 is connected with a connecting piece 4, and then the two connecting pieces 4 are butt jointed and welded with the pole 22, so that the two connecting pieces 4 are fixedly connected with the pole 22. The opposite edges of the two connecting pieces 4 are fitted, which is beneficial to enlarge the contact area between the connecting piece 4 and the pole 22, so that it is similar to the connecting piece 4 which is not spliced, and has similar electrical performance. The above structure saves material and process under the premise of not losing electrical performance.

[0039] In some embodiments, the spliced joint formed by splicing the two connecting pieces 4 is linear. The opposite edges of the two connecting pieces 4 are straight edges, and the opposite edges of the two connecting pieces 4 are complementary. Wherein, the straight line is along the direction of the central axis of the length direction of the pole 22. In other embodiments, the straight line and the central axis of the length direction of the pole 22 have an included angle greater than 0 degrees and less than 90 degrees.

[0040] The spliced joint formed by splicing the two connecting pieces 4 is curved. The opposite edges of the two connecting pieces 4 are curved edges, and the opposite edges of the two connecting pieces 4 are complementary. Wherein, the curve is a wavy line or an arc line protruding towards the connecting piece 4.

[0041] In other embodiments, the edges of the two connecting pieces 4 are sawtooth-shaped.

[0042] In some embodiments, the overlapping area of the two connecting pieces 4 and the pole 22 is the same.

[0043] Referring to Figure 1In combination with 2 to 4, a welding tool for assembling a battery composed of a plurality of battery cells 1 and a plurality of connecting pieces 4, the tool comprises a positioning part for positioning the battery cells 1 and the top cover 2, and a welding part arranged above the tool table, the welding part is provided with a welding pressure nozzle 5, the welding pressure nozzle 5 is attached to the two connecting pieces 4, and the welding pressure nozzle 5 and the connecting pieces 4 form a sealed cavity, and the welding part is provided with a negative pressure mechanism for vacuumizing the sealed cavity to collect foreign matters. The welding pressure nozzle 5 comprises a pressure nozzle mounting plate 6, an inner pressure nozzle 7 and an outer pressure nozzle 8 elastically connected to the pressure nozzle mounting plate 6, the outer pressure nozzle 8 is sleeved outside the inner pressure nozzle 7, the pressure nozzle mounting plate 6 is provided with a vertically arranged guide hole 9, the inner pressure nozzle 7 is provided with a guide column 10, and the guide column 10 and the guide hole 9 are in sliding fit. The outer pressure nozzle 8 and the inner pressure nozzle 7 are used for positioning the two connecting pieces 4 and forming the sealed cavity. The outer pressure nozzle 8 is elastically connected, which is used for matching the different thicknesses of the positive and negative connecting pieces 4, improving the compatibility, and reducing the precision requirement of the tool assembly. The outer pressure nozzle 8 is larger at the top and smaller at the bottom, the horizontal cross section is a rectangular ring body, and the inner edge corner position is provided with a rounded corner. In some embodiments, the outer pressure nozzle 8 and the inner pressure nozzle 7 are fixedly connected through fasteners, and the top and bottom are the same. The bottom edge of the outer pressure nozzle 8 abuts against the outer edge of the pole 22 for positioning and sealing.

[0044] Referring to Figure 1 As shown, the welding part further comprises a distance sensor 11 for detecting the distance. The distance sensor 11 is electrically connected to the corresponding driving structure, the driving structure controls the lifting of the welding pressure nozzle 5, and through the control of the distance sensor 11, the collision between the welding part and the battery cell 1 is avoided. In some embodiments, the pressure nozzle mounting plate 6 is installed at the middle position of the upper top plate 21, and the distance sensor 11 is arranged at the position corresponding to the battery cell 1 of the upper top plate 21, because the battery cell 1 is the highest and is most likely to collide. On the basis of the above, in some embodiments, the positions corresponding to the battery cell 1 on both sides of the upper top plate 21 are provided with distance sensors 11 as redundancy.

[0045] The positioning part of the welding tool is used to position the battery cell 1. Since the tabs 3 on the battery cell 1 and the corresponding connecting pieces 4 are fixed by ultrasonic or laser welding in the previous process, the good product generated in the previous process will be well positioned, and the connecting pieces 4 will be naturally in the edge fitting state. Therefore, the tool only needs to be positioned and positioned, and the edge fitting precision of the two connecting pieces 4 can be realized. The advantage of indirectly positioning the battery cell 1 compared to directly positioning the connecting pieces 4 is that the connecting pieces 4 themselves have a certain flexibility and weak bending resistance. Directly positioning the connecting pieces 4 for welding may cause the connecting pieces 4 not to be completely stretched, which may cause stress concentration. In the subsequent use process, the temperature rise of the battery and the corrosion of the electrolyte may cause the connecting pieces 4 to be easily detached, affecting the service life of the battery. The welding part mainly includes a welding pressure nozzle 5 for positioning the connecting pieces 4. The welding pressure nozzle 5 is pressed after the positioning of the positioning part, and the pressing will generate a sealed cavity with the connecting pieces 4, separating the welding area from the non-welding area. The welding material and foreign matter generated in the welding area will not enter the non-welding area, especially the battery cell 1 position. The sealed cavity is also conducive to using negative pressure means to suck out the welding material and foreign matter therein, keeping the inside of the quasi-assembled battery clean, thereby improving the consistency and reliability of the battery.

[0046] Referring to Figure 5As shown, the positioning part includes a positioning plate 12 and a containing plate 13. The positioning plate 12 is provided with a plurality of positioners near the outer edge position. The positioners include fixed positioners 14 and adjustable positioners 15, which are arranged at opposite positions of the positioning plate 12. The containing plate 13 is abutted by the positioners at both ends in the length direction and both ends in the width direction. The positioning plate 12 positions the containing plate 13. For the welding tool, the positioning plate 12 is relatively fixed, and the containing plate 13 is relatively movable, which is beneficial to the access to the assembly line conveyor belt. The two ends of the containing plate 13 have handles in some embodiments, which improves portability. The positioning plate 12 has positioners for positioning the battery cell 1. The fixed positioners 14 and the adjustable positioners 15 are arranged at both sides of the containing plate 13 in the length direction and the width direction. One end of the containing plate 13 is abutted by the fixed positioner 14, and the other end is adjusted by the adjustable positioner 15 and abutted by the adjustable positioner 15. The positioning of the containing plate 13 is realized through the above structure. In some embodiments, the adjustable positioner 15 includes a positioner base fixed on the positioning plate 12 and a positioner abutting block threadedly connected to the positioner base. The positioner abutting block is extended or retracted by rotating the threaded shaft of the positioner abutting block. In other embodiments, the positioner abutting block is connected to the positioner base in a telescopic manner through a pneumatic or hydraulic manner. The pressure is applied to the positioner base, and the pressure is converted to the pressure output by the positioner abutting block and abutted on the containing plate 13. The center position of the containing plate 13 is provided with a top cover support passing hole 16. The corresponding position of the positioning plate 12 is fixedly connected with a top cover support 17 through a corresponding pad 23. The corner point of the top surface of the top cover support 17 is upwardly extended to form a limiting flange 18. The outer edge of the battery top cover 2 is abutted by the limiting flange 18. The above structure improves the positioning mode of the battery top cover 2. The bottom surface of the battery top cover 2 is upwardly arranged at a position corresponding to the middle position of the two battery cells 1 and is also the middle position of the containing plate 13. The limiting flange 18 limits the length and width directions of the battery top cover 2, and only allows the battery top cover 2 to move away from the containing plate 13 in the vertical direction. A plurality of limiting guide pieces 19 are symmetrically arranged at the left and right sides of the containing plate 13. The three side surfaces of the battery cell 1 are abutted by the limiting guide pieces 19, and the other side surface is abutted by the limiting flange 18. The limiting guide piece 19 has a bending section which is outwardly bent to reduce the difficulty of the battery cell 1 entering. The limiting guide piece 19 is in the shape of L.

[0047] A method for using the welding tool for the battery composed of the battery cell 1 and the spliced connecting piece 4. The steps include:

[0048] S1: The positioning part positions the battery cell 1 and the top cover 2.

[0049] S2: The welding part is lowered to abut the connecting piece 4 by the welding pressure nozzle 5.

[0050] S3: A plurality of welding sections are welded, and the total length of the welding sections exceeds 60 mm.

[0051] S4: Apply a negative pressure to the sealing cavity formed by the welding nozzle 5 and the mounting plate and maintain it for a certain period of time;

[0052] S5: Move the welding part upward and take out the integrated battery cell 1 and top cover 2 from the tooling.

[0053] Through the above steps, good positioning of the splicing type connecting piece 4 can be achieved, and separated welding thereof can be realized. In this process, foreign matter can be sucked, improving the reliability and consistency of the battery and the yield rate of the battery.

[0054] Among them, in some embodiments, the shape of the welding segment is continuous. The welding segment is arranged in a serpentine shape on the two connecting pieces 4 and passes through the joint at least twice, and the distances passed by the welding segments on the two connecting pieces 4 are the same. In some other embodiments, the welding segment is a closed-loop shape connected end to end. In still some other embodiments, there are several parallel and equally long welding segments evenly distributed on the two connecting pieces 4.

[0055] Embodiment 2:

[0056] The difference between this embodiment and Embodiment 1 is as follows:

[0057] Refer Figure 6 As shown, the outer nozzle 8 is elastically connected to the nozzle mounting plate 6 through the spring column 20, and the inner nozzle 7 is fixedly connected to the nozzle mounting plate 6. The cross-sections of the outer nozzle 8 are of equal size, and the cross-sections of the inner nozzle 7 are of equal size. The outer nozzle 8 is sleeved outside the inner nozzle 7, and the outer wall of the inner nozzle 7 abuts against the inner wall of the outer nozzle 8. A pressure relief hole 24 is provided at a position near the top of the inner nozzle 7. Without external force, a part of the outer nozzle 8 extends out of the inner nozzle 7, and a part of the pressure relief hole 24 of the inner nozzle 7 extends out of the outer nozzle 8. When the welding nozzle 5 abuts against the connecting plate, the inner nozzle 7 advances relative to the outer nozzle 8, and the pressure relief hole 24 is shielded, creating a sealed environment. When the welding nozzle 5 disengages from the connecting plate, the inner nozzle 7 fixedly connected to the nozzle mounting plate 6 first disengages from the connecting plate, while the outer nozzle 8 maintains the fit with the positioning part under the action of the spring part. The top of the inner nozzle 7 gradually extends out of the outer nozzle 8, and the pressure relief hole 24 comes into contact with the atmospheric pressure, and the sealed environment of the sealing cavity is destroyed.

[0058] The function of this structure is that the welding nozzle 5 forms a negative pressure environment with the negative pressure mechanism. To separate the welding nozzle 5 from the connecting piece 4, either the negative pressure mechanism needs to be separated from the top of the welding nozzle 5, or the air needs to be returned to make the internal air pressure close to the normal atmospheric pressure, or it needs to be directly pulled away forcefully. The first and third methods will generate corresponding pulling forces, which may cause damage to the connecting piece 4, and the second method may cause the backflow of foreign matter. Through this structure, the damage to the connecting piece 4 caused by forceful pulling can be eliminated. The structure is simple, and the internal sealing structure is automatically destroyed as the welding nozzle 5 rises, eliminating the pulling force.

[0059] The above embodiments are only the preferred schemes of the present application, and do not limit the present application in any form. Other variations and modifications can be made without departing from the technical solutions recited in the claims.

Claims

1. A welding fixture for a battery composed of cells with spliced ​​connecting pieces, characterized in that, The welding part is arranged above the jig table and is provided with a welding pressing nozzle which is attached to the two connecting tabs, and the welding pressing nozzle and the connecting tabs enclose a sealed cavity, and the welding part draws vacuum on the sealed cavity through a negative pressure mechanism to collect foreign matter. The positioning part includes a positioning plate and a supporting plate, the positioning plate is provided with a plurality of positioners near the outer edge position, the positioners include fixed positioners and adjustable positioners, the fixed positioners and the adjustable positioners are arranged at opposite positions of the positioning plate respectively, and the two ends in the length direction and the two ends in the width direction of the supporting plate abut against the positioners respectively. The center position of the supporting plate is provided with a top cover support passing hole, the corresponding position of the positioning plate is fixedly connected with a top cover support, and part of the outer edge of the top cover support extends upward to form a limiting flange. The left and right sides of the supporting plate are symmetrically provided with a plurality of limiting guide pieces, and the three sides of the battery cell abut against the limiting guide pieces, and the other side abuts against the limiting flange.

2. The welding jig for the battery composed of the battery cells connected by the tab according to claim 1, wherein The welding pressing nozzle includes a pressing nozzle mounting plate, an inner pressing nozzle and an outer pressing nozzle elastically connected to the pressing nozzle mounting plate, the outer pressing nozzle is sleeved outside the inner pressing nozzle, the pressing nozzle mounting plate is provided with a vertical guide hole, the inner pressing nozzle is provided with a guide column, and the guide column and the guide hole are in sliding fit.

3. The welding tool for the battery of the electric chip group connected by the splicing tab according to claim 1, characterized in that, The welding part further includes a distance sensor for detecting distance.

4. A method of using a welding jig for a battery composed of a plurality of battery cells based on the tabbing type connection sheet according to claim 1, characterized by, The method includes the following steps: S1: the positioning part positions the battery cell and the top cover; S2: the welding part is lowered to attach the connecting tabs with the welding pressing nozzle; S3: a plurality of welding sections are welded, and the total length of the welding sections exceeds 60mm; S4: negative pressure is drawn on the sealed cavity formed by the welding pressing nozzle and the mounting plate and maintained for a period of time; S5: the welding part is moved upward, and the integrated battery cell and top cover are taken out from the tooling.

5. A battery consisting of a cell having a tab with a splice made by a method of using a welding tool according to claim 4, characterized in that, The method includes two battery cells and a top cover, the tab of the battery cell is fixedly connected with a connecting tab, the two connecting tabs are arranged opposite to each other and the edges of the opposite edges are attached, and the connecting tab and the pole of the battery top cover are welded.

6. The battery of claim 5, wherein the battery is a battery composed of a plurality of battery cells connected in series by the tab. The splicing joint formed by splicing the two connecting tabs is linear.

7. The battery of claim 5, wherein the battery is a battery composed of a plurality of battery cells connected in series by the tab. The welding area of the two connecting tabs and the pole is the same.

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