CN218362802U - Auxiliary device for laser welding of battery and battery cell tab - Google Patents

Abstract

The application relates to the technical field of batteries, in particular to a battery and an auxiliary device for laser welding of battery core lugs. The battery core electrode lug and the battery end cover in the battery are directly welded and fixed through laser welding without a switching piece, and at least two welding parts of the electrode lug on the battery core electrode lug are arranged at intervals, so that the continuous heating time of the battery end cover can be effectively shortened, and the occurrence of the thermal deformation condition of the battery end cover is reduced. Because the battery end cover is difficult to be out of shape, in the laser welding process, the effective fusion width of the battery core lug and the battery end cover can be improved, the conductive capacity of the battery core lug and the battery end cover is improved, and compared with the conventional mode of connecting the battery end cover and the battery core lug through the adapter plate, the battery in the application does not need to adopt the adapter plate, reduces the welding procedure, improves the processing efficiency of the battery, and reduces the cost of raw materials.

Description

Auxiliary device for laser welding of battery and battery cell tab

Technical Field

The application relates to the technical field of batteries, in particular to a battery and an auxiliary device for laser welding of battery core lugs.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

The battery includes electric core, battery case and end cover, is provided with utmost point post on the end cover, for the ease of being connected of electric core and utmost point post, sets up the switching piece usually between electric core and the utmost point post, switching piece and electric core utmost point ear welded fastening, and with utmost point post welding. When the switching piece is welded, the switching piece and the electrode lug of the battery core are positioned and then welded, and then the switching piece and the battery end cover are positioned and then welded, so that the welding process is more, the production efficiency of the battery is low, and the cost of raw materials is improved.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application aims to provide a battery, which is used for solving the technical problems of low battery production efficiency and high cost caused by the connection of a battery core tab and a battery end cover through a switching piece in the conventional battery;

another purpose of the embodiment of this application still lies in providing an auxiliary device is used in welding of supplementary battery core utmost point ear and battery end cover welded battery core utmost point ear laser.

The first aspect provides a battery, which comprises a battery cell and a battery end cover, wherein the battery cell is provided with a battery cell tab, the battery end cover comprises a cover body and a pole arranged on the cover body, the battery cell tab is provided with a tab welding part, the tab welding part and the pole are fixed through laser welding, and at least two tab welding part intervals on the battery cell tab are arranged.

In the scheme that one kind probably implements, utmost point post includes the cylinder and fixes the switching utmost point post board in cylinder one end, and switching utmost point post board includes the plate body and is in the utmost point ear welding platform of plate body dorsad cylinder one side, and the plate body is fixed with the cylinder, and utmost point ear welding platform sets up two at least, and adjacent utmost point ear welding platform interval sets up in order to form heat dissipation channel between adjacent utmost point ear welding platform, and utmost point ear welding platform corresponds at least one utmost point ear welded part, utmost point ear welding platform and corresponding utmost point ear welded part welded fastening.

In one possible embodiment, the tab welding stations correspond to the tab welding portions one to one.

In one possible implementation scheme, the tab welding portions on the battery cell tabs are arranged in a linear shape, the tab welding portions are in a strip shape, and the extending direction of the tab welding portions is consistent with the arrangement direction of the tab welding portions.

In a possible implementation scheme, the thickness of the battery cell tab is 0.4mm to 0.6mm, and the effective fusion width of the battery cell tab and the battery post is 1.4mm to 1.6mm.

According to the second aspect of the application, still provide a battery core utmost point ear laser welding auxiliary device, include:

the battery comprises a base, wherein a battery cell positioning structure for positioning and supporting a battery cell and an end cover positioning structure for positioning and supporting a battery end cover are arranged on the base;

the pressure head is arranged on the base and above the end cover positioning structure and used for applying pressure to the lugs of the battery core, the pressure head is provided with at least two welding avoidance holes corresponding to the welding parts of the lugs in any one possible embodiment of the first aspect, and the welding avoidance holes are arranged at intervals; the welding avoidance holes penetrate through the pressure head up and down and are used for aligning to the corresponding lug welding parts so that laser can be used for welding through the lug welding parts;

and the pressing mechanism is configured on the base and used for applying acting force to the pressure head to enable the pressure head to press the battery core tab and the battery end cover together.

In the scheme that the utility model provides an perhaps implement, electric core utmost point ear laser welding auxiliary device still includes the pressure head seat, and the direction removes the configuration on the base from top to bottom of pressure head seat, pressure head seat and pressure head clearance fit set up elastic buffer between pressure head seat and the pressure head, and the pressure head seat passes through elastic buffer and applys the effort to the pressure head, hold-down mechanism applys the effort to the pressure head through compressing tightly the pressure head seat.

In a possible implementation scheme, the cell tab laser welding auxiliary device includes an anti-drop bolt, and the anti-drop bolt is fixed with one of the pressure head seat and the pressure head and is in stop fit with the other one of the pressure head seat and the pressure head through a bolt head of the anti-drop bolt.

In a possible implementation scheme, the pressure head comprises downward convex lugs, the number of the lugs corresponds to the number of the welding avoidance holes in a one-to-one mode, the adjacent lugs are arranged at intervals, and the welding avoidance holes penetrate through the lugs.

In the scheme that a probably was implemented, end cover location structure was the end cover constant head tank, and the tank bottom of end cover constant head tank is provided with the end cover through-hole, and the utmost point post that the end cover of end cover supplied the battery stretches into.

In a possible embodiment, the base comprises a base body and an adapter plate for fixing at the laser welding station, wherein the adapter plate and the base body are arranged up and down and are positioned by a vertically extending positioning pin, so that the base body can be separated from the adapter plate upwards.

The beneficial effect of this application: the battery core lug in the battery and the battery end cover are directly welded and fixed through laser welding without a switching piece, and at least two lug welding parts are arranged on the battery core lug at intervals, so that the continuous heating time of the battery end cover can be effectively shortened, and the occurrence of the thermal deformation condition of the battery end cover is reduced. Because the battery end cover is difficult to be out of shape, in the laser welding process, the effective fusion width of the battery core lug and the battery end cover can be improved, the conductive capacity of the battery core lug and the battery end cover is improved, and compared with the conventional mode of connecting the battery end cover and the battery core lug through the adapter plate, the battery in the application does not need to adopt the adapter plate, reduces the welding procedure, improves the processing efficiency of the battery, and reduces the cost of raw materials.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic position diagram of a laser welding apparatus and a cell tab laser welding auxiliary device shown in an embodiment of a battery of the present application;

fig. 2 is a schematic diagram illustrating a state where a cell, a cell end cap and a cell tab laser welding auxiliary device are assembled together according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a base shown in an embodiment of the battery of the present application;

fig. 4 is a top view of a cell, a cell end cap, and a cell tab laser welding assist apparatus shown in an embodiment of the present application after being assembled together;

FIG. 5 isbase:Sub>A cross-sectional view taken along A-A in FIG. 4;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 4;

fig. 7 is a state diagram of a cell tab and a cell end cap during welding in an embodiment of the battery of the present application;

fig. 8 is a top view of a cell tab and a cell end cap shown in an embodiment of a battery of the present application during welding;

FIG. 9 isbase:Sub>A cross-sectional view taken along A-A in FIG. 8;

FIG. 10 is a cross-sectional view taken along line B-B of FIG. 8;

description of reference numerals:

1. an electric core; 11. a battery core tab; 111. a tab welding part; 2. a battery end cap; 21. a cover body; 22. a pole column; 221. a cylinder; 222. switching pole column plates; 2221. a plate body; 2222. a tab welding station; 2223. a heat dissipation channel; 23. an inner side seal ring; 24. an outer seal ring; 25. an inner plastic part; 26. an outer plastic part; 3. a base; 31. a battery cell positioning groove; 311. a notch; 32. an end cap locating slot; 33. an end cap through hole; 331. A large-size section; 332. a small-sized section; 34. a base body; 35. a patch panel; 351. a fixing hole; 36. positioning pins; 37. an operating handle; 38. a guide post; 39. an adjusting block; 391. a long hole; 392. the adjusting block is raised; 4. a press head seat; 41. the pressing head seat avoidance hole; 5. a pressure head; 51. an anti-drop bolt; 52. welding the avoidance hole; 53. A bump; 6. an elastic buffer member; 7. a pressing mechanism; 71. an elbow clip force application elastic head; 8. provided is a laser welding device.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

According to a first aspect of the present application, there is provided a battery, as shown in fig. 1 to 10, which includes a battery core 1, a battery case, and a battery end cap 2. The battery cell 1 is a laminated battery cell which comprises a positive plate, a negative plate and a diaphragm. The battery cell 1 is provided with a battery cell tab 11, and the battery cell tab 11 is formed by flat welding of 54 layers of lead-out pole pieces. Two battery core tabs 11 are also arranged, and are respectively a positive tab and a negative tab. The battery end cover 2 is fixed with a battery case which is cylindrical. In this embodiment, there are two battery end covers 2, which are a positive end cover and a negative end cover, respectively, and the two battery end covers 2 are disposed at two ends of the battery case.

As shown in fig. 10, the battery end cap 2 includes a cap body 21, a post 22 provided on the cap body 21, an inner seal ring 23, an outer seal ring 24, an inner plastic member 25, and an outer plastic member 26.

The inner sealing ring 23 and the outer sealing ring 24 are sleeved on the pole 22. Inner plastic part 25 is located inside cover 21 and outer plastic part 26 is located outside cover 21.

As shown in fig. 7, the cell tab 11 has a tab welding portion 111, and the tab welding portion 111 is fixed to the electrode post 22 by laser welding. At least two tab welding portions 111 on the cell tabs 11 are arranged at intervals. In this embodiment, three tab welding portions 111 are provided at intervals.

The tab welding portion 111 is provided in plural, and the battery end cap 2 and the tab welding portion 111 are less heated and less deformed during laser welding. Can suitably improve laser welding device's power, and then increase effective the melting width of battery end cover 2 and electric core utmost point ear 11 splice, effectively melt wide increase back, can improve the current capacity of utmost point post 22 and electric core utmost point ear 11 on the battery end cover 2, reduce to generate heat, can also strengthen the connection reliability of battery end cover 2 and electric core utmost point ear 11.

In this embodiment, the thickness of the battery tab 11 is 0.4mm to 0.6mm, and the effective fusion width of the battery tab 11 and the terminal 22 is 1.4mm to 1.6mm.

In order to facilitate the arrangement, in this embodiment, the tab welding portions 111 on the cell tabs 11 are arranged in a straight line. The tab welding parts 111 have a bar shape, and the extending direction of the tab welding parts 111 is identical to the arrangement direction of the respective tab welding parts 111.

In this embodiment, the pole 22 includes a cylinder 221 and a transition pole plate 222 fixed to one end of the cylinder 221. Cylinder 221 is fixed to transfer pole cylinder plate 222 by friction welding. The adapting pole column plate 222 includes a plate body 2221 and tab welding tables 2222 located on one side of the plate body 2221 opposite to the column body 221, the plate body 2221 is fixed to the column body 221, at least two tab welding tables 2222 are provided, and adjacent tab welding tables 2222 are spaced apart from each other to form a heat dissipation channel 2223 between the adjacent tab welding tables 2222. In this embodiment, the heat dissipation channel 2223 is a heat dissipation groove formed by the adjacent tab welding tables and the plate body. The tab welding lands 2222 correspond to the tab welding portions 111 one by one, and the tab welding lands 2222 are welded and fixed to the corresponding tab welding portions 111. The heat dissipation channels 2223 between adjacent tab welding lands 2222 can facilitate the flow of heat, prevent the deformation of the battery end cap 2 caused by the excessively high temperature of the battery end cap 2 during welding, and further improve the heat resistance of the battery end cap.

In order to facilitate the welding of battery end cover 2 and electric core utmost point ear 11, this application still provides an electric core utmost point ear laser welding auxiliary device, electric core utmost point ear laser welding auxiliary device includes base 3, as shown in fig. 3, be equipped with the end cover location structure who is used for the electric core location structure of location support electric core 1 and is used for location support battery end cover 2 on the base 3, in this embodiment, electric core location structure is the electric core constant head tank 31 with the adaptation of electric core 1 shape, end cover location structure is the end cover constant head tank 32 with the adaptation of battery end cover 2 shape. In order to facilitate taking and placing the battery cell 1, a notch 311 is formed in the side wall of the cell positioning groove 31, and the battery cell 1 can be taken out by directly contacting the side surface of the battery cell 1 through the notch 311.

In order to facilitate heat dissipation of the battery end cover 2 during laser welding and facilitate taking out of the battery end cover 2, an end cover through hole 33 is formed in the bottom of the end cover positioning groove 32, in the embodiment, the end cover through hole 33 is a step hole which comprises a large-size section 331 and a small-size section 332, after the battery end cover 2 is positioned and placed in the end cover positioning groove 32, the column body 221 of the pole column 22 extends into the large-size section 331, a certain space is reserved between the lower end face of the column body 221 and the small-size section 332 for heat supply flow and dissipation, and when the battery end cover 2 needs to be taken out, the ejector rod can extend into the small-size section 332 to take out the battery end cover 2. The stepped hole is beneficial to heat dissipation of the battery end cover 2 during welding, the thermal deformation of the battery end cover 2 is reduced, and the battery end cover 2 is convenient to take out and position.

The base 3 comprises a base body 34 and an adapter plate 35 for fixing at a laser welding station, wherein the adapter plate 35 and the base body 34 are arranged up and down and are positioned by a positioning pin 36 arranged vertically, so that the base body 34 can be separated from the adapter plate 35 upwards. The positioning pin 36 is fixed to the adapter plate 35. In order to facilitate the separation of the seat body 34 from the adapter plate 35, an operating handle 37 is provided on the seat body 34. The operating handle 37 is provided in two, one at the front end of the seat body 34 and the other at the rear end of the seat body 34. The adapter plate 35 is provided with a fixing hole 351 for fixing on a table top at a laser welding station.

And a pressure head seat 4 and a pressure head 5 are arranged above the end cover positioning groove 32, and the pressure head 5 is used for applying pressure to the battery core tab 11. The press head 5 is arranged on the press head seat 4 in an up-and-down guiding manner. As shown in fig. 5, the pressure head base 4 is disposed on the base 3 so as to be vertically guided, an elastic buffer 6 is provided between the pressure head base 4 and the pressure head 5, and the pressure head base 4 applies an urging force to the pressure head 5 via the elastic buffer 6. In this embodiment, the elastic buffer 6 is a coil spring. A guide post 38 is fixed on the base 3, and a guide hole which is in up-and-down guide sliding fit with the guide post 38 is arranged on the press head seat 4.

In this embodiment, the anti-disengaging bolt 51 is fixed on the pressure head 5, the anti-disengaging bolt 51 penetrates through the pressure head base 4, and the bolt head of the anti-disengaging bolt 51 is in blocking fit with the pressure head base 4, so as to limit the distance of relative movement between the pressure head 5 and the pressure head base 4. The press head 5 is matched with the press head seat 4 in an up-and-down guiding way through an anti-drop bolt 51.

The elastic buffer member 6 is sleeved on the periphery of the anti-falling bolt 51, one end of the elastic buffer member 6 is pressed against the pressure head 5, and the other end of the elastic buffer member 6 is pressed against the spiral head of the anti-falling bolt 51.

The pressure head 5 is provided with a welding avoidance hole 52, and the welding avoidance hole 52 penetrates through the pressure head 5 up and down; the welding avoiding hole 52 is used for aligning with a tab welding part 111 on the battery cell tab 11, so that laser can be welded through the tab welding part 111; the number of the welding escape holes 52 is the same as the number of the tab welding parts 111, and the welding escape holes 52 correspond to the tab welding parts 111 one to one. The pressing head 5 includes downwardly protruding projections 53, the number of projections 53 corresponds to the number of welding avoidance holes 52 one by one, adjacent projections 53 are spaced apart, and the welding avoidance holes 52 pass through the projections 53. In this embodiment, the ram 5 is integrally formed, and the bump 53 is in a frustum shape in order to facilitate the demolding of the bump 53.

In this embodiment, the pressure head seat 4 is provided with a pressure head seat avoidance hole 41 vertically opposite to the welding avoidance hole.

The auxiliary device for laser welding of the battery cell tabs comprises a pressing mechanism 7, wherein the pressing mechanism 7 is configured on the base 3 and used for applying acting force to the pressure head 5 to enable the pressure head 5 to compress the battery cell tabs 11. The pressing mechanism 7 applies acting force to the pressing head 5 by pressing the pressing head seat 4. In this embodiment, the pressing mechanism 7 is an elbow clip. An elbow clip force application elastic head 71 is fixed on the elbow clip and is used for applying pressure to the pressure head seat 4.

As shown in fig. 1 to 4, an adjusting block 39 capable of adjusting the position back and forth is disposed at the rear end of the seat body 34, the adjusting block 39 is fixed on the seat body 34 by a bolt, a long hole 391 extending back and forth is disposed on the adjusting block 39, and the bolt passes through the long hole 391 to fix the adjusting block 39. Position around through adjusting regulating block 39 can adapt to different electric core 1's size, also can finely tune electric core 1 position around. The left end and the right end of the adjusting block 39 are both provided with adjusting block bulges 392 protruding upwards, and two long holes are arranged and penetrate through the adjusting block bulges 392.

In this embodiment, two elbow clamps are in the left and right sides of electric core constant head tank 31 respectively, and the sliding fit that leads from top to bottom of pressure headstock 4 and guide post 38 to pressure headstock 4 upwards removes and can separate with guide post 38, and elbow clamp and pressure headstock 4 do not all influence the installation of electric core 1 and battery end cover 2 and take out like this, are favorable to improving getting of electric core utmost point ear 11 and battery end cover 2 and put efficiency, and then improve the production efficiency of battery.

The welding process of the battery core tab 11 and the battery end cover 2 is as follows: the outer side face of the battery end cover 2 faces downwards, the inner side face of the battery end cover faces upwards and is positioned in the end cover positioning groove 32, the battery core 1 is positioned in the battery core positioning groove 31, the battery core tabs 11 are located on the upper side of the battery end cover 2, the three tab welding parts 111 of the battery core tabs 11 correspond to the three tab welding tables 2222 on the battery end cover 2 respectively, then the pressing head 5 and the pressing head seat 4 which are assembled together are arranged on the guide column 38, pressure is applied to the pressing head seat 4 through the elbow clamp, the protruding blocks 53 on the pressing head 5 press the battery core tabs 11, the three tab welding parts 111 of the battery core tabs 11 are vertically opposite to the welding avoiding holes 52 on the protruding blocks 53, and the laser welding equipment 8 is operated to weld the battery core tabs 11 through the welding avoiding holes 52. In the welding process, since the tab welding portion 111 is arranged in a line, the traveling path of the welding head of the laser welding apparatus 8 is also in a line.

After the welding is accomplished, loosen the elbow and press from both sides, take off pressure head 5 and pressure headstock 4, tak eoff away can with battery end cover 2 and electric core 1.

To sum up, the battery core tab 11 and the battery end cover 2 of this application battery are directly welded, can effectively reduce the welding process of battery core tab 11 and battery end cover 2, have cancelled the switching piece back simultaneously, have saved the material. The welding position of the battery core tab 11 and the battery end cover 2 is discontinuously arranged, so that the rapid heat dissipation of the battery end cover 2 during laser welding is facilitated, and the deformation of the battery end cover 2 caused by heat generated by laser welding is reduced. Because the influence of being heated of battery end cover 2 is less, can suitably improve laser welding equipment 8's power, and then help improving effective melting width of battery end cover 2 and electric core utmost point ear 11 welding position, improve electric conductive property between electric core utmost point ear 11 and the battery end cover 2, and then reduce generating heat of welding position, improve the installation nature of battery.

In some embodiments of the present application, the arrangement and placement of the welding region of the cell tab may be in a triangular shape, an S-shape, or other shapes as required. The number of the tab welding parts can also be adjusted according to the needs, for example, two, four, five or any other number of the tab welding parts are arranged.

In one embodiment, the post is an integrated structure, and the post body and the switching post plate are integrally formed. In one embodiment, one side surface of the pole adapter plate welded with the pole lug is a plane. In one embodiment, two electrode welding stations correspond to one electrode tab welding portion, and two electrode welding stations are provided. In one embodiment, four tab welding portions are provided, and four corresponding pole welding stations are provided. In one embodiment, the number of the leading-out pole pieces of the battery tab can be 20-60, and the corresponding thickness of the battery core tab is adjusted according to the requirement.

In one embodiment, the pressing mechanism adopts a pressing air cylinder or an electric push rod. In one embodiment, the end cover positioning structure may be a plurality of end cover positioning pillars disposed on the base, the end cover positioning pillars are in positioning fit with the edges of the end cover, and similarly, the electric core positioning structure may be a plurality of electric core positioning pillars, and the electric core positioning pillars are in positioning fit with the edges of the electric core.

In one embodiment, the pressure head is directly matched with the guide column in a guide sliding mode, and a pressure head seat is not needed. In one embodiment, the pressure head and the pressure head seat are directly matched in a vertically guiding and sliding manner, and a spiral spring is arranged between the pressure head and the pressure head seat. In one embodiment, a pressure head guide post is arranged between the pressure head and the pressure head seat, the pressure head and the pressure head seat are in sliding fit through the lower half section guided by the pressure head guide post, and a spiral spring is sleeved on the upper half section of the pressure head guide post.

In one embodiment, the bottom surface of the end cover positioning groove is a complete plane, and when the battery end cover is taken out, the battery end cover is directly taken out from the upper part.

In one embodiment, the lower side surface of the pressure head is a plane and is simultaneously contacted with the welding parts of the lugs.

In a second aspect, an embodiment of an auxiliary device for laser welding of battery cell tabs is further provided, where the structure of the auxiliary device for laser welding of battery cell tabs is the same as that of the auxiliary device for laser welding of battery cell tabs described in any specific embodiment of the above battery, and is not described in detail.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (11)

1. The utility model provides a battery, includes electric core (1) and battery end cover (2), and electric core (1) has electric core utmost point ear (11), and battery end cover (2) are including lid (21) and utmost point post (22) of setting on lid (21), and its characterized in that, electric core utmost point ear (11) have utmost point ear welded part (111), and utmost point ear welded part (111) are fixed through laser welding with utmost point post (22), utmost point ear welded part (111) interval on electric core utmost point ear (11) sets up two at least.

2. The battery according to claim 1, wherein the pole (22) comprises a cylinder (221) and a switching pole column plate (222) fixed at one end of the cylinder (221), the switching pole column plate (222) comprises a plate body (2221) and at least two tab welding tables (2222) arranged on one side of the plate body (2221) opposite to the cylinder (221), the plate body (2221) is fixed with the cylinder (221), the tab welding tables (2222) are arranged at least two, the adjacent tab welding tables (2222) are arranged at intervals to form a heat dissipation channel (2223) between the adjacent tab welding tables (2222), the tab welding tables (2222) correspond to at least one tab welding part (111), and the tab welding tables (2222) are welded and fixed with the corresponding tab welding parts (111).

3. The battery according to claim 2, wherein the tab welding stages (2222) correspond one-to-one to the tab welding portions (111).

4. The battery according to claim 1, 2 or 3, wherein the tab welding portions (111) of the cell tabs (11) are arranged in a straight line shape, the tab welding portions (111) are in a strip shape, and the extending direction of the tab welding portions (111) is consistent with the arrangement direction of the tab welding portions (111).

5. The battery according to claim 1, 2 or 3, characterized in that the thickness of the cell tab (11) is 0.4mm-0.6mm, and the effective melt width of the cell tab (11) and the pole (22) is 1.4mm-1.6mm.

6. A cell tab laser welding assist device for assisting in welding a battery end cap (2) of a battery to a cell tab (11) as defined in any of claims 1-5, comprising:

the battery cell positioning structure is used for positioning and supporting the battery cell (1) and the end cover positioning structure is used for positioning and supporting the battery end cover (2) are arranged on the base (3);

the pressure head (5) is arranged on the base (3) and above the end cover positioning structure and used for applying pressure to the battery cell tabs (11), the pressure head (5) is provided with welding avoiding holes (52) corresponding to the tab welding parts (111), and at least two welding avoiding holes (52) are arranged at intervals; the welding avoidance holes (52) penetrate through the pressure head (5) up and down, and the welding avoidance holes (52) are used for aligning to the corresponding tab welding parts (111) so that laser can be welded through the tab welding parts (111);

and the pressing mechanism (7) is configured on the base (3) and is used for applying acting force to the pressure head (5) to enable the pressure head (5) to press the battery core tab (11) and the battery end cover (2) together.

7. The cell tab laser welding auxiliary device according to claim 6, wherein the cell tab laser welding auxiliary device further comprises a pressure head seat (4), the pressure head seat (4) is configured on the base (3) in a vertically guiding manner, the pressure head seat (4) is movably matched with the pressure head (5), an elastic buffer member (6) is arranged between the pressure head seat (4) and the pressure head (5), the pressure head seat (4) applies an acting force to the pressure head (5) through the elastic buffer member (6), and the pressing mechanism (7) applies an acting force to the pressure head (5) by pressing the pressure head seat (4).

8. The cell tab laser welding auxiliary device according to claim 7, wherein the cell tab laser welding auxiliary device comprises an anti-drop bolt (51), and the anti-drop bolt (51) is fixed with one of the pressure head seat (4) and the pressure head (5) and is in stop fit with the other of the pressure head seat (4) and the pressure head (5) through a bolt head of the anti-drop bolt (51).

9. The cell tab laser welding auxiliary device according to claim 6, 7 or 8, wherein the pressure head (5) comprises downward-protruding bumps (53), the number of the bumps (53) corresponds to the number of the welding avoidance holes (52), the adjacent bumps (53) are arranged at intervals, and the welding avoidance holes (52) penetrate through the bumps (53).

10. The cell tab laser welding auxiliary device according to claim 6, 7 or 8, wherein the end cover positioning structure is an end cover positioning groove (32), an end cover through hole (33) is formed in the bottom of the end cover positioning groove (32), and the end cover through hole (33) is used for the pole (22) of the battery end cover (2) to extend into.

11. The cell tab laser welding auxiliary device according to claim 6, 7 or 8, characterized in that the base (3) comprises a base body (34) and an adapter plate (35) for fixing at the laser welding station, the adapter plate (35) and the base body (34) are arranged above and below and are positioned by a vertically extending positioning pin (36), so that the base body (34) can be separated from the adapter plate (35) upwards.

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