CN116213931A

CN116213931A - Lithium ion battery core protection plate and laser welding method thereof

Info

Publication number: CN116213931A
Application number: CN202310305288.2A
Authority: CN
Inventors: 肖大红; 齐振伟; 何旭辉; 黄斌; 刘长昊
Original assignee: Fullymax Battery Co ltd
Current assignee: Fullymax Battery Co ltd
Priority date: 2023-03-24
Filing date: 2023-03-24
Publication date: 2023-06-06

Abstract

The application provides a lithium ion battery core protection plate and a laser welding method thereof. According to the laser welding method for the lithium ion battery core protection plate, the laser welding device is used for welding, the battery core and the protection plate are sequentially loaded on the carrier plate, the carrier plate is placed on the positioning plate, and the metal induction switch sequentially sends starting instructions to the air cylinder and the laser emission device; the cylinder drives the sliding block and the pressing and holding melon to move towards the lug direction of the battery cell according to the starting instruction, so that the pressing and holding melon presses the lug of the battery cell at the welding position of the protection plate, and the laser emission device emits laser beams to the laser avoidance window according to the starting instruction, and the laser beams act at the welding position of the lug and the protection plate. According to the method, the metal inductive switch simultaneously controls the starting actions of the air cylinder and the laser emission device, so that the clamping and clamping efficiency is improved, the phenomenon that the operation efficiency is low due to the traditional manual starting switch or the pedal starting switch is effectively avoided, the welding efficiency is improved, and a strong magnet structure is not required to be additionally arranged.

Description

Lithium ion battery core protection plate and laser welding method thereof

Technical Field

The invention relates to the technical field of welding of lithium ion protection plates, in particular to a lithium ion battery core protection plate and a laser welding method thereof.

Background

When producing lithium ion battery core, need to weld fixing to the utmost point ear of battery core and protection shield to realize the fixed of battery core and protection shield. At present, conventional practice, as shown in fig. 1, is to manually open the melon pressing on the clamp, then place the protection board and the battery core in the clamp respectively, because the clamp is provided with a powerful magnet, the melon pressing is made of metal material, when the melon pressing is manually pressed down by a user, the melon pressing can be subjected to the suction force of the powerful magnet, so that the melon pressing can well press and attach the lug of the battery core and the place where the protection board needs to be welded on the clamp, the lug of the battery core and the protection board are fixed, then, the assembled clamp is manually placed on the laser welding equipment to be welded, as shown in fig. 2, finally, the switch of the laser welding equipment is pressed down, so that the laser can penetrate the small window on the melon pressing to the place where the lug and the protection board need to be welded, and the lug and the protection board are welded together, and the welding fixation of the lug and the protection board is realized.

However, because be equipped with powerful magnet on the anchor clamps for need great power when opening the press melon, thereby cause the clamping and get the clamp slower, for example patent number CN214641270U discloses a magnetism for lithium cell welding process inhale location tool, has complex operation, and the clamping is got the clamp slower, thereby causes welding efficiency lower. In addition, when the assembled clamp is manually placed on the laser welding equipment to be welded, the laser welding can be performed only by a manual starting switch or a pedal starting switch, so that the problem of lower operation efficiency exists, and the welding efficiency is further reduced.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide the lithium ion battery core protection plate and the laser welding method thereof, wherein the lithium ion battery core protection plate has the advantages of simpler and more convenient battery core taking and placing operation, high welding efficiency and high welding starting precision, and a strong magnetic adsorption-free structure.

The aim of the invention is realized by the following technical scheme:

the laser welding method for the lithium ion battery core protection plate adopts a laser welding device for welding, the laser welding device comprises a carrier, a pressing component and a laser emission device, the carrier is used for placing the protection plate and the battery core, the pressing component is used for pressing the tab of the battery core at the welding position of the protection plate, the laser emitted by the laser emission device is used for penetrating through the pressing component and irradiating the welding position of the protection plate,

the carrier comprises a carrier plate and a positioning plate, wherein the positioning plate is provided with a metal induction switch, the carrier plate is used for placing a protection plate and a battery cell, the carrier plate is provided with a triggering part, the triggering part is used for triggering the metal induction switch, and the metal induction switch is electrically connected with a control end of the laser emission device;

the pressing component comprises an air cylinder, a linear slide rail, a slide block and a pressing melon, wherein the slide block is arranged on the linear slide rail in a sliding manner, the telescopic end of the air cylinder is connected with the slide block, the air cylinder is used for pushing the slide block to perform reciprocating displacement on the linear slide rail, the control end of the air cylinder is electrically connected with the metal induction switch, the pressing melon is connected with the slide block, and the pressing melon is provided with a laser avoidance window;

The laser welding method of the lithium ion battery core protection plate comprises the following steps:

sequentially loading the battery core and the protection plate on the carrier plate so that the tab of the battery core is correspondingly placed at a position corresponding to the welding position of the protection plate;

placing the carrier plate on the positioning plate, and enabling a triggering part of the carrier plate to be in triggering contact with a metal induction switch of the positioning plate, so that the metal induction switch sequentially sends a starting instruction to the air cylinder and the laser emission device;

the cylinder drives the sliding block and the pressing and holding melon to move towards the lug direction of the battery cell according to the starting instruction, and the pressing and holding melon presses and holds the lug of the battery cell at the welding position of the protection plate, so that the welding position of the protection plate is exposed in the laser avoidance window;

and the laser emission device emits laser beams to the laser avoidance window according to the starting instruction, and the laser beams act on the welding positions of the electrode lugs and the protection plates so as to perform welding operation.

In one embodiment, the cylinder is pressed down at a speed of 100mm/min to 300mm/min.

In one embodiment, two pressing and holding melons are arranged on the sliding block at intervals.

In one embodiment, the number of the sliding blocks, the sliding guide rails and the air cylinders is two, the sliding blocks and the sliding guide rails are arranged in one-to-one correspondence, the telescopic end of each air cylinder is connected with one sliding block, and each pressing melon is connected with one sliding block.

In one embodiment, the pressing assembly further comprises two connecting rods, the number of the sliding blocks and the number of the sliding guide rails are two, the sliding blocks and the sliding guide rails are arranged in one-to-one correspondence, the connecting rods are respectively connected with the two sliding blocks, and the telescopic ends of the air cylinders are connected with the connecting rods.

In one embodiment, the connecting rod comprises a first connecting rod and a second connecting rod, the telescopic end of the air cylinder is connected with the first end of the first connecting rod, the second end of the first connecting rod is rotationally connected with the middle part of the second connecting rod, the first end of the second connecting rod is in swinging connection with one of the sliding blocks, and the second end of the second connecting rod is in swinging connection with the other sliding block.

In one embodiment, the pressing assembly further comprises two mounting seats, each mounting seat is in threaded connection with one sliding block, and each pressing melon is in threaded connection with one mounting seat.

In one embodiment, the carrier plate is provided with a first placing groove and a second placing groove, the first placing groove is used for placing the battery cell, the second placing groove is used for placing the protection plate, and a tab support partition part is further arranged between the first placing groove and the second placing groove.

In one embodiment, the pressing melon comprises a connecting seat, an adjusting plate and a pressing claw, wherein the pressing claw is connected with the connecting seat through the adjusting plate, and the connecting seat is connected with the sliding block.

The lithium ion battery core protection plate is obtained by welding by adopting the laser welding method of the lithium ion battery core protection plate in any embodiment.

Compared with the prior art, the invention has at least the following advantages:

1) According to the lithium ion battery cell protection plate laser welding method, as the support plate is provided with the trigger part, the positioning plate is provided with the metal induction switch, when a user places the loaded support plate on the positioning plate, the trigger part of the support plate can be contacted with the metal induction switch of the positioning plate, so that the metal induction switch can sequentially send starting instructions to the cylinder and the laser emission device, at the moment, a cylinder starting signal is sent out first to control the cylinder to move, thereby driving the sliding block, the mounting piece and the pressing melon to move towards the direction of the electrode lug of the battery cell, further enabling the pressing melon to press the electrode lug of the battery cell at the welding position of the protection plate, ensuring that the welding position of the protection plate can be exposed in the laser avoidance window, after the cylinder finishes the action, then sending starting instructions to the laser emission device, so that the laser emission device can emit laser beams to the laser avoidance window, and further enabling the laser beams to act on the welding position of the electrode lug and the protection plate, and further realizing the welding fixation of the electrode lug and the protection plate, thus, the welding efficiency is improved, the conventional welding device is further improved, compared with the conventional welding device is started up, the efficiency is improved, the welding efficiency is improved, compared with the conventional welding device is started up, and the welding efficiency is further, and the welding efficiency is improved, thereby ensuring the welding quality of the tab and the protective plate.

2) According to the laser welding method for the lithium ion battery core protection plate, the linear sliding rail is adopted, so that the phenomenon that the pressure-deflection phenomenon can not occur when the pressure-maintaining melon is moved can be well ensured, the welding window of the pressure-maintaining melon can be well pressed at the welding position of the protection plate, the accurate alignment of the welding window and the welding position is further ensured, the phenomenon that the virtual welding occurs in welding is effectively avoided, and the welding quality of the electrode lug and the protection plate is further improved.

3) According to the laser welding method for the lithium ion battery cell protection plate, the pressing melon is arranged on the pressing component, so that a user does not need to manually open the pressing melon when loading and unloading the battery cell and the protection plate, the operation flow is simplified, the structure of the carrier plate becomes simple and easy to operate, the clamping and clamping efficiency is greatly improved, and the welding efficiency of the protection plate and the battery cell is further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flow chart of the conventional clamping operation of a lithium ion battery cell protection plate;

FIG. 2 is a schematic view of a conventional laser welding apparatus according to the present invention;

fig. 3 is a flowchart of a laser welding method for a lithium ion battery core protection plate according to an embodiment of the invention

FIG. 4 is a schematic view illustrating a directional structure of a laser welding apparatus according to an embodiment of the present invention;

fig. 5 is an enlarged view at a shown in fig. 4;

FIG. 6 is a schematic view illustrating a directional structure of a laser welding apparatus according to an embodiment of the present invention;

fig. 7 is an enlarged view at B shown in fig. 6;

FIG. 8 is a schematic diagram illustrating a direction structure of a dual cylinder pressure holding assembly according to an embodiment of the present invention;

FIG. 9 is a schematic diagram illustrating a direction structure of a single cylinder pressing assembly according to an embodiment of the present invention;

FIG. 10 is a schematic view of a partial one-way structure of a single cylinder pressure holding assembly according to an embodiment of the present invention;

FIG. 11 is a schematic view of a part of the single cylinder hold down assembly of FIG. 10 in another orientation;

fig. 12 is an enlarged view at C shown in fig. 11;

FIG. 13 is a schematic view of a cylinder, connecting rod and slider connection structure according to an embodiment of the present invention;

fig. 14 is an enlarged view of D shown in fig. 13;

FIG. 15 is a schematic view illustrating a direction of a melon pressing device according to an embodiment of the present invention;

Fig. 16 is a schematic view illustrating a structure of a second connecting rod in one direction according to an embodiment of the invention.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In order to better understand the technical scheme and beneficial effects of the present application, the present application is further described in detail below with reference to specific embodiments.

Referring to fig. 4 to 6, in the laser welding method for the lithium ion battery cell protection plate according to the embodiment, the laser welding device 10 is used for welding, the laser welding device 10 includes a carrier 100, a pressing assembly 200 and a laser emitting device 300, the carrier 100 is used for placing the protection plate 500 and the battery cell 400, the pressing assembly 200 is used for pressing the tab of the battery cell 400 at the welding position of the protection plate 500, and the laser emitted by the laser emitting device 300 is used for passing through the pressing assembly 200 and irradiating the welding position of the protection plate 500 so as to realize the welding of the tab of the battery cell 400 and the protection plate 500; since the carrier 100 includes the carrier plate 110 and the positioning plate 120, the positioning plate 120 is provided with the metal inductive switch 121, the carrier plate 110 is used for placing the protection plate 500 and the battery cell 400, the carrier plate 110 is provided with the triggering portion 111, and the metal inductive switch 121 is electrically connected with the control end of the laser emitting device 300.

Referring to fig. 7, the pressing assembly 200 includes an air cylinder 210, a linear sliding rail 220, a sliding block 230 and a pressing melon 240, the sliding block 230 is slidably disposed on the linear sliding rail 220, a telescopic end of the air cylinder 210 is connected with the sliding block 230, the air cylinder 210 is used for pushing the sliding block 230 to perform reciprocating displacement on the linear sliding rail 220, a control end of the air cylinder 210 is electrically connected with the metal inductive switch 121, the pressing melon 240 is connected with the sliding block 230, and the pressing melon 240 is provided with a laser avoidance window 2431.

When a user places the carrier plate 110 on the positioning plate 120, the triggering part 111 is firstly contacted with the triggering metal induction switch 121, so that the triggering metal induction switch 121 can sequentially send out a starting signal to the air cylinder 210 and the laser emission device 300, at this time, the triggering metal induction switch 121 firstly sends out an actuating signal to control the air cylinder 210 to move, thereby driving the sliding block 230, the mounting piece and the pressing holder 240 to move towards the tab direction of the electric core 400, further enabling the pressing holder 240 to press the tab of the electric core 400 to the welding position of the protecting plate 500, ensuring that the welding position of the protecting plate 500 can be exposed in the laser avoidance window 2431, after the air cylinder 210 finishes the action, then the metal induction switch 121 can send a starting instruction to the laser emission device 300, so that the laser emission device 300 can emit a laser beam to the laser avoidance window 2431, and further enable the laser beam to act on the welding position of the tab and the protecting plate 500, and further realizing the laser welding fixation of the tab and the protecting plate 500.

Further, by adopting the linear slide rail 220, the phenomenon that the pressure deflection of the pressure maintaining melon 240 does not occur during movement can be well ensured, so that the welding window of the pressure maintaining melon 240 can be well pressed at the welding position of the protection plate 500, further, the accurate alignment of the welding window and the welding position is ensured, the phenomenon of cold welding is effectively avoided, and the welding quality of the electrode lugs and the protection plate 500 is improved.

Further, since the pressing melon 240 is disposed on the pressing component 200, a user does not need to manually open the pressing melon 240 when loading and unloading the battery cell 400 and the protection board 500, so that the operation flow is simplified, the structure of the carrier plate 110 becomes simple and easy to operate, the efficiency of clamping and clamping is greatly improved, and the welding efficiency of the protection board 500 and the battery cell 400 is further improved.

Referring to fig. 3, specifically, the laser welding method of the lithium ion battery cell protection plate includes the following steps:

and S101, sequentially loading the battery cell 400 and the protection plate 500 on the carrier plate 110, so that the tab of the battery cell 400 is correspondingly placed at a position corresponding to a welding position of the protection plate 500, and loading the battery cell 400 and the protection plate 500 is realized.

It should be noted that, since the pressing melon 240 is disposed on the pressing component 200, a user does not need to manually open the pressing melon 240 when loading and unloading the battery cell 400 and the protection board 500, so that the operation flow is simplified, and the structure of the carrier plate 110 becomes simple and easy to operate, thereby greatly improving the efficiency of clamping and picking up the clamp.

S102, placing the carrier plate 110 on the positioning plate 120, and enabling the triggering part 111 of the carrier plate 110 to trigger and contact with the metal induction switch 121 of the positioning plate 120, so that the metal induction switch 121 sequentially sends starting instructions to the air cylinder 210 and the laser emitting device 300, namely, when the triggering part 111 contacts with the metal induction switch 121, the metal induction switch 121 firstly sends a signal for starting the air cylinder 210, and then sends a signal for starting the laser emitting device 300 after the air cylinder 210 moves, thereby effectively avoiding the phenomenon of lower operation efficiency caused by the traditional manual starting switch or the pedal starting switch, further improving the welding efficiency, improving the welding starting precision, and ensuring the welding quality of the electrode lug and the protection plate 500 well. In one embodiment, the triggering portion 111 is a sensing metal block to implement triggering actions of the triggering portion 111 and the sensing switch.

S103, the air cylinder 210 drives the sliding block 230 and the pressing and holding melon 240 to move towards the lug direction of the battery cell 400 according to the starting instruction, and the pressing and holding melon 240 presses the lug of the battery cell 400 at the welding position of the protection plate 500, so that the welding position of the protection plate 500 is exposed in the laser avoidance window 2431, the automatic starting action of the metal inductive switch 121 on the air cylinder 210 is realized, the automatic starting precision of the metal inductive switch 121 on the air cylinder 210 is ensured, the welding efficiency of the lug of the battery cell 400 and the protection plate 500 is improved, and the welding quality of the lug and the protection plate 500 is effectively ensured.

S104, the laser emission device 300 emits laser beams to the laser avoidance window 2431 according to the starting instruction, the laser beams act on the welding positions of the electrode lugs and the protection plate 500 to perform welding operation, so that the metal induction switch 121 can automatically start the laser emission device 300, the automatic starting precision of the metal induction switch 121 to the laser emission device 300 is ensured, the laser beams can well penetrate through the laser avoidance window 2431, the laser beams can act on the welding positions of the electrode lugs and the protection plate 500 to achieve welding fixation of the electrode lugs of the battery cell 400 and the protection plate 500, and therefore, the welding efficiency is improved, and the welding quality is effectively ensured.

In the above-mentioned laser welding method for lithium ion battery core protection plate, since the carrier plate 110 is provided with the trigger portion 111, the positioning plate 120 is provided with the metal induction switch 121, when the loaded carrier plate 110 is placed on the positioning plate 120 by a user, the trigger portion 111 of the carrier plate 110 can be in contact with the metal induction switch 121 of the positioning plate 120, so that the metal induction switch 121 can sequentially send a start command to the cylinder 210 and the laser emitting device 300, at this time, a start signal of the cylinder 210 is sent to control the cylinder 210 to move, so as to drive the slider 230, the mounting piece and the holding melon 240 to move towards the tab of the battery core 400, so that the holding melon 240 can press the tab of the battery core 400 against the welding position of the protection plate 500, so as to ensure that the welding position of the protection plate 500 can be exposed in the laser avoiding window 2431, and after the cylinder 210 completes the operation, the metal induction switch 121 sends a start command to the laser emitting device 300, so that the laser emission device 300 can emit laser beams to the laser avoidance window 2431, and the laser beams can act on the welding position of the lug and the protection plate 500, and further the laser welding fixation of the lug and the protection plate 500 is realized, thus, the laser welding of the lug and the protection plate 500 can be rapidly completed by directly using the metal induction switch 121, the triggering part 111, the cylinder 210 and the laser emission device 300 in cooperation, a powerful magnet structure is not needed to be additionally arranged, so that the cylinder 210 can quickly drive the press-holding melon 240 to move, thereby improving the clamping and clamping efficiency, further improving the welding efficiency, and the phenomenon that the operation efficiency is lower due to the traditional manual starting switch or the foot starting switch is effectively avoided, further improving the welding efficiency, and improves the welding start precision, thereby well ensuring the welding quality of the tab and the protection plate 500.

According to the laser welding method for the lithium ion battery core protection plate, the linear slide rail 220 is adopted, so that the phenomenon that the pressure maintaining melon 240 is biased in moving can be well ensured, the welding window of the pressure maintaining melon 240 can be well pressed at the welding position of the protection plate 500, the accurate alignment of the welding window and the welding position is further ensured, the phenomenon of cold welding is effectively avoided, and the welding quality of the tab and the protection plate 500 is further improved. Further, since the pressing melon 240 is disposed on the pressing component 200, a user does not need to manually open the pressing melon 240 when loading and unloading the battery cell 400 and the protection board 500, so that the operation flow is simplified, and the structure of the carrier plate 110 becomes simple and easy to operate, thereby greatly improving the efficiency of clamping and fetching.

In one embodiment, the pressing speed of the cylinder 210 is 100 mm/min-300 mm/min, so as to ensure that the cylinder 210 can balance and reliably drive the sliding block 230 to slide on the sliding guide rail for linear reciprocating displacement, thereby effectively avoiding the phenomenon that the pressing melon 240 is easy to incline when reciprocating displacement is performed, further ensuring that the laser avoidance window 2431 on the pressing melon 240 can be well pressed on the welding position of the protection plate 500, so as to realize accurate alignment of the welding position of the laser avoidance window 2431 and the protection plate 500, and especially match the width of the laser avoidance window 2431 which is larger than the lug, so that the laser beams emitted by the subsequent laser emitting device 300 can be ensured to fall in the laser avoidance window 2431, so as to ensure that the laser beams emitted by the laser emitting device 300 can completely pass through the laser avoidance window 2431 and act on the welding position of the protection plate 500, thereby not only improving the laser utilization rate of the laser emitting device 300, but also improving the welding quality of the lug and the protection plate 500.

It should be noted that, because the tab is a thin metal sheet, and one end of the tab is connected to the heavier battery cell 400, the position where the tab is connected to the battery cell 400 is easy to be broken, deformed or displaced under the action of too large external force. If the speed of the cylinder 210 is greater than 300mm/min, the pressure at the welding position of the tab and the protection plate 500 caused by the pressing of the pressing melon 240 is too high, so that the position of the connection position of the tab and the battery cell 400 is easy to be broken, deformed or shifted, and the phenomenon of cold welding is easy to occur, thereby reducing the welding quality of the tab and the protection plate 500. If the pressing speed of the cylinder 210 is less than 100mm/min, the pressing speed is low, so that the welding efficiency is affected, and the pressing pressure is low, so that the pressure-maintaining melon 240 cannot be ensured to well adhere the tab to the welding position of the protection plate 500, and the welding quality of the tab and the protection plate 500 is reduced. Therefore, when the speed of the cylinder 210 is controlled to be 100-300 mm/min, the force of the cylinder 210 can be effectively ensured to be relatively proper, so that the pressure of the pressure maintaining melon 240 to the welding position of the tab and the protection plate 500 can not be too high, the pressure maintaining melon 240 can be ensured to smoothly press the tab to the welding position of the protection plate 500, the phenomenon of cold joint is effectively avoided, and the welding quality of the tab and the protection plate 500 is further improved.

In one preferred embodiment, the laser emission device is located below the carrier plate, and the cylinder 210 drives the sliding block 230 and the pressing and holding melon 240 to move upwards towards the tab direction of the battery cell 400 according to the starting instruction, so that the laser emission device can perform the reverse welding on the tab and the protection plate 500, the phenomenon that the spark during welding is directly splashed on the surface of the battery cell 400 to damage the battery cell 400 is effectively avoided, and the welding quality of the tab and the protection plate 500 is more effectively ensured.

As shown in fig. 5 and 8, in one embodiment, the carrier plate 110 is provided with a first placement groove 112 and a second placement groove 113, the first placement groove 112 is used for placing the battery cell 400, the second placement groove 113 is used for placing the protection plate 500, and a tab support partition 114 is further disposed between the first placement groove 112 and the second placement groove 113. Further, the tab support partition 114 is a hemispherical deformation member, on one hand, the tab support partition 114 is ensured to have better elasticity for the hemispherical deformation member, and the pressing and holding melon 240 can be effectively prevented from being released under pressure during pressing, so that friction force between the tab and the protection plate 500 and between the tab and the pressing and holding melon 240 can be effectively reduced, and thus, the scraping of the tab and the protection plate 500 can be effectively avoided, and the lithium ion battery core protection plate with good quality can be obtained.

In order to ensure that the tab support partition 114 has better supporting force and elastic force, in a preferred embodiment, the tab support partition 114 is convexly disposed in the first placement groove 112, and the thickness of the tab support partition 114 after elastic compression is flush with the first placement groove 112, so that under the condition that the pressing melon 240 can be effectively prevented from scraping the tab and the protection board 500 when being pressed down, the pressing melon 240 can be flush with the first placement groove 112 when the tab is pressed down on the protection board 500, so that the pressing melon 240 can be pressed on the protection board 500 smoothly and reliably. Further, the tab support partition 114 is a hemispherical silica gel deformation member.

It can be appreciated that the tab support partition 114 is added between the first placing groove 112 and the second placing groove 113, so that the tab support partition 114 can provide better support for the connection position of the tab and the battery cell 400, and thus the phenomenon that the connection position of the tab and the battery cell 400 is easily broken, deformed or shifted due to too large pressure of the welding position of the tab and the battery cell 500 when the tab 240 is pressed down by the pressing and holding melon 240 is effectively avoided, so that the tab can be pressed down by the pressing and holding melon 240 smoothly at the welding position of the protection plate 500.

Further, as shown, in one embodiment, the tab support partitions 114 are height-adapted to the tab position in the cell 400. It can be appreciated that, since the height of the tab support partition 114 is adapted to the height of the tab at the position of the battery cell 400, when the battery cell 400 is placed in the first placement groove 112, the tab support partition 114 is just flush with the tab, so as to ensure that the pressure retaining melon 240 can smoothly press the tab at the welding position of the protection plate 500.

In one embodiment, the battery cell 400 is a square battery cell 400, and the surface of the tab support partition 114, which is close to the pressing melon 240, is provided with a plane, so as to ensure that when the square battery cell 400 is placed in the first placing groove 112, the plane of the tab support partition 114 can provide a smoother support for the tab, so that the pressing melon 240 can better ensure that the tab can be pressed on the welding part of the protection plate 500 smoothly, and the welding quality of the tab and the protection plate 500 is further improved.

In one embodiment, when the pressing and holding melon 240 is pressed down on the welding position of the tab and the protection plate 500, one end of the pressing and holding melon 240 is flush with the edge of the tab support partition 114, so as to ensure that the pressing and holding melon 240 can comprehensively press the tab placed on the welding position of the protection plate 500, thus better ensuring that the pressing and holding melon 240 can smoothly press the tab on the welding position of the protection plate 500, so that the laser beam can be better used on the welding position of the tab and the protection plate 500.

In one embodiment, the first placement groove 112 is matched with the battery cell 400, that is, the depth of the first placement groove 112 is equal to the thickness of the battery cell 400, so that when the battery cell 400 is placed in the first placement groove 112, the battery cell 400 is flush with the end surface of the notch of the first placement groove 112, so that the battery cell 400 can be ensured to fall into the first placement groove 112 comprehensively, the situation that the battery cell 400 is not easy to move when the press-holding melon 240 is pressed down can be effectively avoided, and the tab of the battery cell 400 can be well pressed down at the welding position of the protection plate 500 when the press-holding melon 240 is pressed down, so that the welding quality of the tab and the protection plate 500 is improved; meanwhile, the battery cell 400 is flush with the end face of the notch of the first placing groove 112, so that a user can take out the battery cell quickly, and the operation efficiency of taking the clamp is improved.

Likewise, in one embodiment, the second placement groove 113 is matched with the protection plate 500, that is, the depth of the second placement groove 113 is equal to the thickness of the protection plate 500, so as to ensure that when the protection plate 500 is placed in the second placement groove 113, the protection plate 500 is flush with the end surface of the notch of the second placement groove 113, on one hand, when the pressure maintaining melon 240 is pressed down, the tab of the battery cell 400 can be well pressed at the welding position of the protection plate 500, so that the welding quality of the tab and the protection plate 500 is improved; on the other hand, the protective plate 500 is not positioned too deep in the second placing groove 113, so that the user can take out the protective plate more quickly, and the efficiency of the clip taking operation is improved.

As shown in fig. 8 and 15, in one embodiment, the pressing jaw 240 includes a connection base 241, an adjusting plate 242, and a pressing claw 243, the pressing claw 243 is connected to the connection base 241 through the adjusting plate 242, and the connection base 241 is connected to the slider 230. It can be appreciated that, by adding the adjusting plate 242 between the pressing claw 243 and the connecting seat 241, a user can adjust the connection position of the adjusting plate 242 and the pressing claw 243 according to the actual position of the tab on the battery cell 400, so as to ensure that the pressing claw 243 can fully press the tab onto the welding portion of the protection plate 500, thereby improving the adaptability of the pressing assembly 200 to different battery cell 400 specifications.

In one embodiment, the width of the pressing claw 243 is larger than the width of the tab, so as to ensure that the pressing claw 243 can fully press the tab against the welding position of the protection plate 500, and thus ensure that the pressing claw 243 can smoothly press the tab against the welding position of the protection plate 500.

As shown in fig. 15, in one embodiment, the pressing assembly 200 further includes a locking member, the adjusting plate 242 is provided with a plurality of first adjusting holes, each first adjusting hole is sequentially provided along the length direction of the adjusting plate 242, the connecting seat 241 is provided with a plurality of second adjusting holes, each second adjusting hole is sequentially provided along the extending direction of the connecting seat 241, the locking member is located in one first adjusting hole and one second adjusting hole, so as to realize detachable connection of the pressing claw 243 and the adjusting plate 242, so, when a user needs to adjust the position of the pressing claw 243, the position of the locking member in the first adjusting hole and the position of the second adjusting hole can be selected according to the position of an actual tab, so that adjustment of different positions of the pressing claw 243 can be realized, and the user can also replace the corresponding pressing claw 243 according to the needs of the actual tab of the battery cell 400, thereby further improving the adaptability of the pressing assembly 200 to different battery cell 400 specifications, facilitating the replacement of the damaged pressing claw 243, and saving the maintenance cost. In this embodiment, two pressing and holding devices 240 are provided, and the two pressing and holding devices 240 are disposed on the slider 230 at intervals. It can be appreciated that, since the tabs of the battery cell 400 are two, i.e., the positive tab and the negative tab, and the positive tab and the negative tab are separately disposed. Therefore, in order to ensure that the two tabs can be well pressed against the welding part of the protection plate 500 by the holding-down tabs 240, the two holding-down tabs 240 are arranged in one-to-one correspondence with the two tabs, so that the two holding-down tabs 240 can be well pressed against the welding part of the protection plate 500.

As shown in fig. 8, in order to better control the pressing effect of the two pressing and holding devices 240 on the two tabs, in one embodiment, the number of the sliding blocks 230, the sliding guide rails and the air cylinders 210 is two, each sliding block 230 is arranged in one-to-one correspondence with each sliding guide rail, the telescopic end of each air cylinder 210 is connected with one sliding block 230, and each pressing and holding device 240 is connected with one sliding block 230.

It can be understood that, by arranging two sliders 230, two sliding guide rails and two cylinders 210, each holding-down melon 240 can be correspondingly arranged by one slider 230, one sliding guide rail and one cylinder 210, so that two holding-down melons 240 can be ensured to be separately arranged, the two cylinders 210 can be independently controlled to make reciprocating displacement on the sliding guide rails by the two holding-down melons 240, the two holding-down melons 240 are ensured to be pressed down to avoid interference with each other, so that two lugs can be better controlled to be smoothly pressed at the welding position of the protection plate 500, and particularly when the heights of the welding points of the protection plate 500 are inconsistent or the heights of two lugs of the battery cell 400 are inconsistent, the separately arranged two holding-down melons 240 can be better pressed on the welding points of the protection plate 500, so that the welding quality of the lugs and the protection plate 500 is improved, the welding quality of the holding-down assembly 200 for the protection plate 500 with inconsistent heights of the welding points of the left and the right and the lugs is further improved, and the welding quality of the protection plate 500 is also compatible.

Because the two pressing and holding devices 240 in the above embodiment are separately arranged, although it can be ensured that the two pressing and holding devices 240 are pressed down to avoid interference with each other, so as to better adapt to the protection plate 500 with inconsistent heights of the left and right welding points and the inconsistent heights of the two tabs, the movement of the two cylinders 210 increases the complexity of controlling the metal inductive switch 121, namely, when the left and right welding points are inconsistent, the pressing speeds of the two different cylinders 210 need to be set, so that the operation and structure are complex; on the other hand, the cost of equipment and operation is increased. Therefore, in one embodiment, as shown in fig. 9, the pressing assembly 200 further includes two connecting rods 250, the number of the sliding blocks 230 and the number of the sliding rails are two, each sliding block 230 is arranged in one-to-one correspondence with each sliding rail, the connecting rods 250 are respectively connected with the two sliding blocks 230 to ensure that the two sliding blocks 230 are connected into a whole through the connecting rods 250, the telescopic ends of the air cylinders 210 are connected with the connecting rods 250 to ensure that one air cylinder 210 can drive the two sliding blocks 230 to move simultaneously, so that one air cylinder 210 can drive the two pressing retainers 240 to move simultaneously, on one hand, the simplification of the control of the metal inductive switch 121 can be ensured, and therefore, the operation is simple, the structure is compact, and on the other hand, the equipment and running cost can be reduced.

Further, in order to ensure that the single cylinder 210 controls the two holding-down devices 240 to accommodate the welding conditions of the protection plate 500 with inconsistent heights of the left and right welding points and the welding conditions of inconsistent heights of the two tabs, in one embodiment, as shown in fig. 10 and 11, the connecting rod 250 includes a first connecting rod 251 and a second connecting rod 252, the telescopic end of the cylinder 210 is connected with the first end of the first connecting rod 251, the second end of the first connecting rod 251 is rotatably connected with the middle part of the second connecting rod 252, the first end of the second connecting rod 252 is in swinging connection with one of the sliding blocks 230, and the second end of the second connecting rod 252 is in swinging connection with the other sliding block 230.

It can be appreciated that, since the second end of the first connecting rod 251 is rotatably connected to the middle portion of the second connecting rod 252, the first end of the second connecting rod 252 is swingably connected to one of the sliders 230, and the second end of the second connecting rod 252 is swingably connected to the other slider 230, so that the first end of the second connecting rod 252 and the second end of the second connecting rod 252 can be supported by the middle portion of the second connecting rod 252, and the two holding fingers 240 can swing up and down with the middle portion of the second connecting rod 252 as a supporting point, thereby forming an automatic balancing structure. That is, when the telescopic end of the cylinder 210 stretches in the direction approaching to the tab, the first connecting rod 251 is pushed by an external force to drive the two sliding blocks 230 to slide on the corresponding sliding guide rails at the same time, so that the two holding-down fingers 240 can be driven to press the welding position of the tab and the protection plate 500, the two holding-down fingers 240 can swing left and right on the second connecting rod 252 to better adapt to the protection plate 500 with inconsistent heights of the left and right welding points and the welding situation with inconsistent heights of the two tabs, so as to ensure that the two holding-down fingers 240 can be flatly pressed on the left and right welding points of the protection plate 500, and therefore, under the condition of ensuring that the holding-down assembly 200 is simple to operate and compact in structure, the suitability of the holding-down assembly 200 for the protection plate 500 with inconsistent heights of the left and right welding points and the welding quality of the welding of the tab and the protection plate 500 is also improved.

In one embodiment, the first end of the first connecting rod 251 is formed with a telescopic cavity, and the telescopic end of the air cylinder 210 is movably disposed in the telescopic cavity, so as to realize connection between the telescopic end of the air cylinder 210 and the first end of the first connecting rod 251, thereby enabling the air cylinder 210 to drive the first connecting rod 251 to perform reciprocating displacement.

As shown in fig. 10 and 11, in one embodiment, the pressing assembly 200 further includes three rotation shafts, namely a first rotation shaft 281, a second rotation shaft 282 and a third rotation shaft 283, wherein the second end of the first connection rod 251 is provided with a first rotation hole 2511, the middle of the second connection rod 252 is provided with a second rotation hole 2521, the first rotation shaft 281 passes through the first rotation hole 2511 and the second rotation hole 2521, and the first rotation shaft 281 is rotatably disposed in the first rotation hole 2511 and the second rotation hole 2521 to realize the rotation connection of the first connection rod 251 and the second connection rod 252, the first end of the second connection rod 252 is provided with a first swinging hole 2522, the two sliders 230 are respectively a first slider 231 and a second slider 232, the first end of the first slider 231 is provided with a second swinging hole 2611, the second rotation shaft 282 passes through the first swinging hole 2522 and the second swinging hole 2611, the second rotation shaft 281 passes through the first rotation hole 2522 and the second swinging hole 2521, the first rotation shaft 281 is rotatably disposed in the first rotation hole 2521 and the second rotation hole 2521, the first rotation shaft 281 is rotatably disposed in the first rotation hole 2511 and the second rotation hole 2521, so as to realize the rotation connection of the first slider 231 and the second connection rod 252, the first end of the first slider 252 is provided with a second rotation shaft 252 is provided with a second swinging hole 2613, the second slider is rotatably disposed in the second rotation hole 2613 and a third rotation hole is rotatably disposed in the second rotation hole 2623, and a fourth rotation hole is rotatably disposed in the second rotation hole 2623, and is rotatably connected with the second slider is rotatably provided with a third slider hole, and has a fourth rotation hole is rotatably provided in rotation hole, and is rotatably and is capable of a rotation shaft main, and is rotatably independently rotatably and rotatably connected.

As shown in fig. 11, in one embodiment, the rotation shaft is a flat-head pin, so as to ensure high flexibility of rotation among the first connecting rod 251, the second connecting rod 252, the first slider 231 and the second slider 232, and ensure that no jamming occurs when the two holding-down buttons 240 and the second connecting rod 252 swing.

As shown in fig. 13, 14 and 16, in one embodiment, the first swinging hole 2522 and the third swinging hole 2523 are U-shaped holes, and the first rotating hole 2511 and the second rotating hole 2521 are circular holes, so that the first connecting rod 251 can relatively smoothly push the sliding block 230 to perform reciprocating displacement on the sliding guide rail under the pushing of the air cylinder 210, and meanwhile, the second rotating shaft 282 and the third rotating shaft 283 can swing well on the second connecting rod 252 without jamming phenomenon, so as to ensure that the two holding-down fingers 240 can reliably and stably press the two lugs on the welding part of the protecting plate 500.

As shown in fig. 13 and 14, in one embodiment, the second rotating shaft 282 forms a first gap 293 in the first swing hole 2522 and the second swing hole 2611, so as to ensure that the second rotating shaft 282 swings in the first swing hole 2522 and the second swing hole 2611 with high flexibility.

In one embodiment, the third rotation shaft 283 has a second gap 294 formed in the third and fourth swing holes 2523 and 2621 to ensure a high flexibility of swinging the third rotation shaft 283 in the third and fourth swing holes 2523 and 2621.

In order to avoid that the two lugs cannot be pressed against the welding part of the protection plate 500 smoothly by the two pressing and holding-down buttons 240 when the swing amplitude of the second rotating shaft 282 and the third rotating shaft 283 is larger, the first gap 293 is set to be 0.1-5 mm, and the second gap 294 is set to be 0.1-5 mm, so that the amplitude of the second rotating shaft 282 and the third rotating shaft 283 is effectively ensured to be smaller, and the two pressing and holding-down buttons 240 can be pressed against the welding part of the protection plate 500 smoothly. In a preferred embodiment, both the first gap 293 and the second gap 294 are 0.1mm.

If the left-right swing width of the two holding-down fingers 240 is large, it is not preferable to ensure that the two holding-down fingers 240 can smoothly press the two tabs against the welding portion of the protection plate 500. Therefore, in one embodiment, the first slider 231 is formed with a first swing limit groove 2613, a second swing hole 2611 communicated with the first swing limit groove 2613 is formed in the first swing limit groove 2613, a second swing hole 2621 communicated with the second slider 232 is formed in the second swing limit groove 2623, a first end of the second connecting rod 252 is located in the first swing limit groove 2613 and is formed with a third gap 296, a second end of the second connecting rod 252 is located in the second swing limit groove 2623 and is formed with a fourth gap 297, the second rotating shaft 282 is rotatably arranged in the first swing hole 2522, the second swing hole 2611 and the first swing limit groove 2613, and the third rotating shaft 283 is rotatably arranged in the third swing hole 2523, the fourth swing hole 2621 and the second swing limit groove 2623, so that small-amplitude swing of the second connecting rod 252 can occur in the first swing limit groove 2613 and the second swing limit groove 2623 under the action of the cylinder 210, and therefore the two press-smooth guide rails 240 can slide on the two guide rails reliably and can be pressed against each other to ensure that the two guide rails are not pressed against each other in a proper manner, and the two guide rails are well pressed against each other, and the two guide plates are kept at the same level.

Further, in order to ensure that the two pressing and holding melons 240 swing on the sliding guide rail more stably and reliably, in one embodiment, the fourth gap 297 is 0.5 mm-8 mm, and the fourth gap 297 is 0.5 mm-8 mm, so as to ensure that the second connecting rod 252 can only slightly swing in the second swing limiting groove 2623 and the first swing limiting groove 2613, thereby ensuring that the two pressing and holding melons 240 swing more stably. In a preferred embodiment, the gap between the second connecting rod 252 and the first swing limiting groove 2613 and the second swing limiting groove 2623 is 1.1mm.

In one embodiment, the sliding guide is a precise linear sliding rail, and the sliding block 230 is a precise linear sliding block 230, so as to ensure that one air cylinder 210 can reliably and balanced drive two pressing and holding melons 240 to slide, thereby effectively avoiding that the two pressing and holding melons 240 can accurately and downwardly press the welding position of the electrode lug and the protection plate 500.

Further, in order to ensure that one air cylinder 210 can reliably and balanced drive two holding-down devices 240 to slide, as shown in fig. 14 and 16, in one embodiment, a fixing portion 2524 protrudes outward from the middle of the second connecting rod 252, and the fixing portion 2524 is provided with a second rotation hole 2521 to ensure that the second connecting rod 252 can better rotate with the second end of the first connecting rod 251, i.e. the fixing portion 2524 provides better support for the rotation of the second connecting rod 252 and the first connecting rod 251, so as to ensure that the air cylinder 210 can reliably and balanced drive two holding-down devices 240 to slide.

As shown in fig. 10 to 13, in one embodiment, the pressing assembly 200 further includes two limiting members for blocking the falling of the second rotating shaft 282 and the third rotating shaft 283. It can be appreciated that the first slider 231 is provided with a first locking hole, the second slider 232 is provided with a second locking hole, the two limiting members are respectively a first limiting member 292 and a second limiting member 295, the first locking hole is disposed adjacent to the second swinging hole 2611, the second locking hole is disposed adjacent to the fourth swinging hole 2621, the first limiting member 292 is disposed in the first locking hole and leaves a fifth gap with the second rotating shaft 282, the second limiting member 295 is disposed in the second locking hole and leaves a sixth gap with the third rotating shaft 283, so that the first limiting member 292 and the second limiting member 295 can effectively block the phenomenon that the second rotating shaft 282 and the third rotating shaft 283 easily fall out during swinging. In the present embodiment, the projection of the first limiting member 292 on the first slider 231 is at least partially located in the first locking hole, and the projection of the second limiting member 295 on the second slider 232 is at least partially located in the second locking hole, so as to ensure that the first limiting member 292 and the second limiting member 295 can effectively block the second rotating shaft 282 and the third rotating shaft 283 from falling off. It will be appreciated that the stop may be a bolt or a stop rivet.

Further, the first locking hole and the second locking hole are threaded holes, so that the first limiting piece 292 is screwed to the first locking hole, the second limiting piece 295 is screwed to the second locking hole, and then the first limiting piece 292 is reliably mounted on the first slider, and the second limiting piece 295 is reliably mounted on the second slider 232.

It should be noted that, if the first limiting member 292 and the second rotating shaft 282 have no fifth gap, and the second limiting member 295 and the third rotating shaft 283 have no sixth gap, the first limiting member 292 and the second limiting member 295 limit the swinging of the second rotating shaft 282 and the third rotating shaft 283, so that the two pressing and holding melons 240 are easy to get stuck or cannot find a stable effect, therefore, the fourth gap 297 is left between the first limiting member 292 and the second rotating shaft 282 and the fifth gap is left between the second limiting member 295 and the third rotating shaft 283 by controlling the first limiting member 292 and the second rotating shaft 282, and thus, under the condition of ensuring that the two pressing and holding melons 240 have better swinging flexibility, the first limiting member 292 and the second limiting member 295 can better block the phenomenon that the second rotating shaft 282 and the third rotating shaft 283 easily fall out during swinging, thereby ensuring that one cylinder 210 can drive the two pressing and holding melons 240 to move stably and evenly, so as to ensure that the two pressing and holding melons 240 can press the welding position of the protecting plate 500 smoothly.

Further, in a preferred embodiment, the first and second limiting

members

292 and 295 are bolts with caps to ensure that the caps of the bolts can better block the second and third

rotating shafts

282 and 283 from easily falling out during swinging.

In one embodiment, the size of the fifth gap is not greater than the depth of the second swing hole 2611, and the size of the sixth gap is not greater than the depth of the third swing hole 2523, so as to ensure that the first limiting member 292 and the second limiting member 295 can effectively block the falling phenomenon of the second rotating shaft 282 and the third rotating shaft 283, and also consider the flexibility and the stability of the swinging of the two holding-down devices 240.

In one embodiment, the pressing assembly 200 further includes two mounting seats, each mounting seat is in threaded connection with a sliding block 230, each pressing melon 240 is in threaded connection with one mounting seat, so as to realize detachable connection among the mounting seat, the sliding block 230 and the pressing melon 240, so that a user can replace the corresponding pressing melon 240 according to the needs of the actual battery cell 400 electrode lug, the suitability of the pressing assembly 200 to different battery cell 400 specifications is improved, and the user can replace the damaged sliding block 230, the mounting seat or the pressing melon 240 conveniently, so that the maintenance cost is saved better.

As shown in fig. 8, in one embodiment, the two mounting seats are a first mounting seat 261 and a second mounting seat 262, the two cylinders 210 are a first cylinder 210 and a second cylinder 210, the two press-holding melons 240 are a first press-holding melon 240 and a second press-holding melon 240, the telescopic end of the first cylinder 210 is connected with the first mounting seat 261, the first mounting seat 261 is in threaded connection with the first slider 231 and the first press-holding melon 240 respectively, so as to realize the sliding control of the first cylinder 210 on the first press-holding melon 240, the telescopic end of the second cylinder 210 is connected with the second mounting seat 262, and the second mounting seat 262 is in threaded connection with the second slider 232 and the second press-holding melon 240 respectively, so as to realize the sliding control of the second cylinder 210 on the second press-holding melon 240, thereby realizing the independent control of the two press-holding melons 240.

To ensure that the hold down assembly 200 swings reliably and smoothly on the sliding rail to better accommodate the welding of a variety of different cell sizes 400. As shown in fig. 9, in one embodiment, the two mounting seats are a first mounting seat 261 and a second mounting seat 262, referring to fig. 13 and 14, the first mounting seat 261 is formed with a first swing limit groove 2613 and a first locking hole, the first swing limit groove 2613 is formed with a second swing hole 2611, the second swing hole 2611 is disposed adjacent to the first locking hole, the second mounting seat 262 is formed with a second swing limit groove 2623 and a second locking hole, the second swing limit groove 2623 is formed with a fourth swing hole 2621, and the fourth swing hole 2621 is disposed adjacent to the second locking hole, the first end of the second connecting rod 252 and the second end of the second connecting rod 252 are respectively located in the first swing limit groove 2613 and the second swing limit groove 2623, the first end of the second connecting rod 252 is formed with a first swing hole 2522, the second end of the second connecting rod 252 is formed with a second swing hole 2611, the second rotating shaft 282 is rotatably disposed in the first swinging hole 2522, the second swinging hole 2611 and the first swinging limiting groove 2613, and the third rotating shaft 283 is rotatably disposed in the third swinging hole 2523, the fourth swinging hole 2621 and the second swinging limiting groove 2623, so as to ensure that the second connecting rod 252 can slightly swing in the first swinging limiting groove 2613 and the second swinging limiting groove 2623, and since the first limiting piece 292 is disposed in the first locking hole, the first limiting piece 292 is used for blocking the second rotating shaft 282 from falling, the second limiting piece 295 is disposed in the second locking hole, and the second limiting piece 295 is used for blocking the third rotating shaft 283 from falling, thus ensuring that one cylinder 210 can reliably and stably drive the two press-holding melons 240 to smoothly press the two polar ears to the welding position of the protection plate 500, to better adapt to the soldering conditions of a plurality of different specification cells 400.

It should be noted that, in order to ensure that the two holding-down melons 240 and the second connecting rod 252 do not get stuck when swinging, the rotating shafts of the present application are all fixed by flat head pins to ensure that the two holding-down melons 240 have higher flexibility, but the second rotating shaft 282 and the third rotating shaft 283 are easy to fall off when being used for a long time, therefore, the present application can effectively avoid the phenomenon that the second rotating shaft 282 and the third rotating shaft 283 fall off easily when swinging for a long time by adding the first limiting member 292 and the second limiting member 295 near the second rotating shaft 282 and the third rotating shaft 283, and simultaneously cooperate with the use of the two sliding blocks 230 to ensure that the two sliding blocks 230 can block the other ends of the second rotating shaft 282 and the third rotating shaft 283, therefore, the two ends of the second rotating shaft 282 and the third rotating shaft 283 can be completely blocked, and the phenomenon that the second rotating shaft 282 and the third rotating shaft 283 easily fall off when swinging for a long time can be effectively avoided, so that the phenomenon that the second rotating shaft 282 and the third rotating shaft 283 easily fall off can be effectively avoided under the condition that the two pressing and holding melons 240 have higher swinging flexibility, the stability that one air cylinder 210 drives the two pressing and holding melons 240 to move can be effectively ensured, and the two pressing and holding melons 240 can be automatically balanced when being pressed down, so that the welding condition that the heights of left welding point and the right welding point are inconsistent or the heights of two polar lugs are inconsistent can be well adapted.

As shown in fig. 11 and 12, in one embodiment, the first swing limit groove 2613 and the second swing limit groove 2623 are both U-shaped grooves. It can be appreciated that by providing the first swing limiting groove 2613 and the second swing limiting groove 2623 as U-shaped grooves, the first swing limiting groove 2613 can perform sandwich swinging on the first end of the second connecting rod 252, the second swing limiting groove 2623 can perform sandwich swinging on the second end of the second connecting rod 252, especially, the first end of the second connecting rod 252 is matched with the first end of the second connecting rod 252 to be located in the first swing limiting groove 2613 and form a third gap 296, the second end of the second connecting rod 252 is located in the second swing limiting groove 2623 and form a fourth gap 297, the second rotating shaft 282 is formed with a first gap 293 in the first swing hole 2522 and the second swing hole 2611, and the third rotating shaft 283 is formed with a second gap 294 in the third swing hole 2523 and the fourth swing hole 2621, so that the two press-holding melons 240 can perform reliable and stable swinging on the sliding guide rail, and the two press-holding melons 240 can be ensured to be balanced automatically when being pressed down, so that the welding points of the two press-holding melons can be better adapted to the welding points of the lithium ion welding quality of the protection plates or the lithium ion welding plates can be ensured to be better welded. Further, in one embodiment, the second rotating hole 2521 is located at the middle position of the second connecting rod 252 to ensure that the two pressing jaws 240 can swing more smoothly when the cylinder 210 is pushed.

As shown in fig. 12, in one embodiment, a U-shaped embedded groove 2512 is formed at a first end of the first connecting rod 251, a first rotation hole 2511 is formed in the U-shaped embedded groove 2512, a fixing portion 2524 of the second connecting rod 252 is embedded in the U-shaped embedded groove 2512, a second rotation hole 2521 is formed in the fixing portion 2524, and the first rotation shaft 281 is located in the first rotation hole 2511, the U-shaped embedded groove 2512 and the second rotation hole 2521, so as to ensure that the first end of the first connecting rod 251 can wrap the fixing portion 2524 of the second connecting rod 252 in the U-shaped embedded groove 2512, thus ensuring that the cylinder 210 can reliably and stably drive the second connecting rod 252, the two mounting seats and the two holding-down levers 240 to swing on the linear guide rails during operation, thereby ensuring that the holding-down assembly 200 operates more stably. Further, the fixing portion 2524 is formed with a seventh gap in the U-shaped embedded groove 2512, so as to ensure a certain flexibility between the first connecting rod 251 and the second connecting rod 252, so as to ensure that the holding assembly 200 can smoothly, stably and reliably move precisely on the linear guide rail, so as to ensure that the two holding fingers 240 can accurately and smoothly press the two tabs on the protection plate 500 with inconsistent heights of the left and right welding points, and to better ensure the welding quality of the tabs and the protection plate 500. The method is particularly suitable for application of the lithium ion battery core protection plate with inconsistent square left and right welding.

The application also provides a lithium ion battery core protection plate, which is prepared by adopting the laser welding method of the lithium ion battery core protection plate in any embodiment. It can be appreciated that by the laser welding method for the lithium ion battery core protection plate, the operation is simple, the lithium ion battery core protection plate with good welding quality and high welding efficiency can be quickly prepared, and meanwhile, the welding of battery cores 400 with different product specifications can be adapted, and the welding method is particularly suitable for welding conditions of inconsistent heights of left and right welding points and inconsistent heights of two tabs.

1) In the above-mentioned laser welding method for lithium ion battery core protection plate, since the carrier plate 110 is provided with the trigger portion 111, the positioning plate 120 is provided with the metal induction switch 121, when the loaded carrier plate 110 is placed on the positioning plate 120 by a user, the trigger portion 111 of the carrier plate 110 can be in contact with the metal induction switch 121 of the positioning plate 120, so that the metal induction switch 121 can sequentially send a start command to the cylinder 210 and the laser emitting device 300, at this time, a start signal of the cylinder 210 is sent to control the cylinder 210 to move, so as to drive the slider 230, the mounting piece and the holding melon 240 to move towards the tab of the battery core 400, so that the holding melon 240 can press the tab of the battery core 400 against the welding position of the protection plate 500, so as to ensure that the welding position of the protection plate 500 can be exposed in the laser avoiding window 2431, and after the cylinder 210 completes the operation, the metal induction switch 121 sends a start command to the laser emitting device 300, so that the laser emission device 300 can emit laser beams to the laser avoidance window 2431, and the laser beams can act on the welding position of the lug and the protection plate 500, and further the laser welding fixation of the lug and the protection plate 500 is realized, thus, the laser welding of the lug and the protection plate 500 can be rapidly completed by directly using the metal induction switch 121, the triggering part 111, the cylinder 210 and the laser emission device 300 in cooperation, a powerful magnet structure is not needed to be additionally arranged, so that the cylinder 210 can quickly drive the press-holding melon 240 to move, thereby improving the clamping and clamping efficiency, further improving the welding efficiency, and the phenomenon that the operation efficiency is lower due to the traditional manual starting switch or the foot starting switch is effectively avoided, further improving the welding efficiency, and improves the welding start precision, thereby well ensuring the welding quality of the tab and the protection plate 500.

2) According to the laser welding method for the lithium ion battery core protection plate, the linear slide rail 220 is adopted, so that the phenomenon that the pressure maintaining melon 240 is biased in moving can be well ensured, the welding window of the pressure maintaining melon 240 can be well pressed at the welding position of the protection plate 500, the accurate alignment of the welding window and the welding position is further ensured, the phenomenon of cold welding is effectively avoided, and the welding quality of the tab and the protection plate 500 is further improved.

3) According to the laser welding method for the lithium ion battery cell protection plate, the press-holding melon 240 is arranged on the press-holding assembly 200, so that a user does not need to manually open the press-holding melon 240 when loading and unloading the battery cell 400 and the protection plate 500, the operation flow is simplified, the structure of the carrier plate 110 becomes simple and easy to operate, the clamping and clamping efficiency is greatly improved, and the welding efficiency of the protection plate 500 and the battery cell 400 is further improved.

The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The laser welding method for the lithium ion battery core protection plate adopts a laser welding device for welding, the laser welding device comprises a carrier, a pressing component and a laser emission device, the carrier is used for placing the protection plate and the battery core, the pressing component is used for pressing the tab of the battery core at the welding position of the protection plate, the laser emitted by the laser emission device is used for penetrating through the pressing component and irradiating the welding position of the protection plate,

2. The laser welding method of the lithium ion battery cell protection plate according to claim 1, wherein the cylinder is pressed down at a speed of 100-300 mm/min.

3. The laser welding method for the lithium ion battery cell protection plate according to claim 1, wherein two pressing and holding pieces are arranged on the sliding block at intervals.

4. The method for laser welding of lithium ion battery cell protection plates according to claim 3, wherein the number of the sliding blocks, the sliding guide rails and the air cylinders is two, the sliding blocks and the sliding guide rails are arranged in one-to-one correspondence, the telescopic end of each air cylinder is connected with one sliding block, and each pressing melon is connected with one sliding block.

5. The method for laser welding of lithium ion battery cell protection plates according to claim 3, wherein the pressing assembly further comprises two connecting rods, the number of the sliding blocks and the number of the sliding guide rails are two, the sliding blocks and the sliding guide rails are arranged in one-to-one correspondence, the connecting rods are respectively connected with the two sliding blocks, and the telescopic ends of the air cylinders are connected with the connecting rods.

6. The method of claim 5, wherein the connecting rod comprises a first connecting rod and a second connecting rod, the telescopic end of the cylinder is connected with the first end of the first connecting rod, the second end of the first connecting rod is rotatably connected with the middle part of the second connecting rod, the first end of the second connecting rod is in swinging connection with one of the sliding blocks, and the second end of the second connecting rod is in swinging connection with the other sliding block.

7. The method of any one of claims 4-6, wherein the press-holding assembly further comprises two mounting bases, each of the mounting bases is screwed with one of the sliders, and each of the press-holding fixtures is screwed with one of the mounting bases.

8. The laser welding method of the lithium ion battery cell protection plate according to claim 1, wherein the carrier plate is provided with a first placing groove and a second placing groove, the first placing groove is used for placing a battery cell, the second placing groove is used for placing a protection plate, and a tab support partition part is further arranged between the first placing groove and the second placing groove.

9. The laser welding method of the lithium ion battery cell protection plate according to claim 1, wherein the pressing melon comprises a connecting seat, an adjusting plate and a pressing claw, the pressing claw is connected with the connecting seat through the adjusting plate, and the connecting seat is connected with the sliding block.

10. A lithium ion battery core protection plate, characterized in that the lithium ion battery core protection plate is obtained by welding by adopting the laser welding method of the lithium ion battery core protection plate in any one of claims 1 to 9.