Battery positive electrode foil welding structure

Abstract

The utility model discloses a battery positive electrode foil welding structure which comprises two welding heads arranged oppositely and a positive electrode foil arranged between the two welding heads, each welding head is provided with at least one welding surface, each welding surface is provided with welding teeth, one side, far away from each welding surface, of each welding tooth is provided with a welding spot protruding out of the surface of each welding tooth, and the welding spots are arranged on the welding surfaces of the welding teeth. Driving parts are arranged on one sides of the welding heads, the output ends of the driving parts are connected with the welding heads, the driving parts can drive the welding heads to move in the vertical direction, the driving parts of the two welding heads are arranged on the sides, away from each other, of the two welding heads correspondingly, the two driving parts are used for controlling the two welding heads to move in the directions close to each other correspondingly, and control parts are arranged on the two driving parts correspondingly; the control part is used for controlling the speed of the driving part so as to control the speed of the welding head separating the anode foil. The speed regulating cylinders are arranged on the two welding heads and controlled by the control piece, so that the two welding heads are slowly separated from the positive electrode foil after welding is completed, and the problem of welding cracks of the positive electrode foil during rapid separation is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery welding technical field especially relates to a battery positive pole foil welding structure. BACKGROUND

[0002] In the production process of lithium battery, metal foil is usually selected as current collector, among which aluminum foil is selected as positive pole current collector and copper foil is selected as negative pole current collector. In the production process of battery, the tab as the key part in the battery, its welding performance is crucial to the quality of battery cell. In the current welding process, the positive pole foil welding crack, the positive pole foil fluctuation and other problems frequently occur in the positive pole welding, the positive pole foil welding crack is caused by the too fast separation speed of the welding head of the welding machine after welding from the foil, the positive pole foil welding crack affects the quality of the cell, thereby causing a large number of cells to need rework. SUMMARY

[0003] The utility model discloses a battery positive pole foil welding structure which overcomes the defects in the prior art.

[0004] The utility model discloses a battery positive pole foil welding structure which overcomes the defects in the prior art.

[0005] A battery positive pole foil welding structure, comprising: two oppositely arranged welding heads and a positive pole foil arranged between the two welding heads, at least one welding surface is arranged on the welding head, a welding tooth is arranged on the welding surface, a welding point protruding from the surface of the welding tooth is arranged on the side of the welding tooth away from the welding surface, a driving member is arranged on one side of the welding head, the output end of the driving member is connected with the welding head, the driving member can drive the welding head to move in the vertical direction, the driving members of the two welding heads are arranged on the sides of the two welding heads away from each other, the two driving members are used for respectively controlling the two welding heads to move in the direction of approaching each other, a control member is arranged on each of the two driving members, and the control member is used for controlling the speed of the driving member to control the speed of the welding head separating from the positive pole foil.

[0006] In one embodiment, a mounting seat is arranged on one side of the welding head, the welding head is fixedly mounted on the mounting seat, and the driving member is mounted on the mounting seat, and the output end of the driving member penetrates through the mounting seat and is connected with the welding head.

[0007] In one embodiment, the driving member is a speed regulating cylinder, two speed regulating valves are mounted on the speed regulating cylinder, the two speed regulating valves are a first speed regulating valve and a second speed regulating valve respectively, the first speed regulating valve is used for adjusting the retreat speed of the piston rod of the speed regulating cylinder, and the second speed regulating valve is used for adjusting the advancing speed of the piston rod of the speed regulating cylinder.

[0008] In one of the embodiments, the two welding heads are a first welding head and a second welding head, the first welding head is above the second welding head, the two controllers are a first controller and a second controller, the first controller is arranged on the speed regulating cylinder connected with the first welding head, the second controller is arranged on the speed regulating cylinder connected with the second welding head, the first controller is used to control the speed of the speed regulating cylinder connected with the first welding head, the first controller is electrically connected with the first speed regulating valve and the second speed regulating valve on the speed regulating cylinder connected with the first welding head, the second controller is used to control the speed of the speed regulating cylinder connected with the second welding head, and the second controller is electrically connected with the first speed regulating valve and the second speed regulating valve on the speed regulating cylinder connected with the second welding head.

[0009] In one of the embodiments, the speed of the first welding head and the second welding head when advancing to the positive electrode foil welding position is 800 mm / min.

[0010] In one of the embodiments, the speed of the first welding head when separating from the positive electrode foil after the welding is completed is 20 mm / min, and the speed of the second welding head when separating from the positive electrode foil after the welding is completed is 60 mm / min.

[0011] In one of the embodiments, the speed of the first welding head and the second welding head when retreating after the separation distance of the first welding head and the second welding head from the positive electrode foil reaches 10-15 mm is 800 mm / min.

[0012] In one of the embodiments, the first welding head and the second welding head are provided with a CCD detection mechanism for monitoring the welding work, the two CCD detection mechanisms are used to detect whether the welding work of the first welding head and the second welding head from the positive electrode foil is completed, the CCD detection mechanism on the first welding head is electrically connected with the first controller, and the CCD detection mechanism on the second welding head is electrically connected with the second controller.

[0013] In one of the embodiments, the welding points on the welding tooth are multiple, and the multiple welding points are distributed along the length direction of the welding tooth.

[0014] In one of the embodiments, the feeding direction of the positive electrode foil is provided with a pressing assembly for pressing the positive electrode foil, the pressing assembly comprises an upper pressing block and a lower pressing block, and the upper pressing block and the lower pressing block press the opposite two outer sides of the positive electrode foil respectively.

[0015] Compared with the prior art, the utility model has at least the following advantages:

[0016] The utility model discloses a battery positive pole foil welding structure through setting the speed regulating cylinder on two welding heads, and through the control member adjustment speed regulating cylinder's speed, with the positive pole foil welding separation speed of two welding heads after completing is adjusted, after the first welding head and the second welding head with the positive pole foil welding complete, two welding heads and the positive pole foil slowly separate, and the first welding head and the second welding head with the positive pole foil between adopt different separation speed, thereby solve the problem that the positive pole foil is adhered with the welding head when separating fast and leads to the positive pole foil welding crack. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to make the technical scheme of the embodiments of the utility model clearer, the following will briefly introduce the drawings needed to be used in the embodiments.

[0018] Figure 1 The utility model provides a kind of partial sectional structure schematic diagram of battery positive pole foil welding structure.

[0019] Brief Description of Drawings: 10, welding head;101, first welding head;102, second welding head;11, welding surface;12, welding tooth;121, welding point;20, positive pole foil;30, mounting seat;40, speed regulating cylinder;41, first speed regulating valve;42, second speed regulating valve;50, first controller;60, second controller;70, CCD detection mechanism;80, compression assembly;81, upper pressing block;82, lower pressing block. DETAILED DESCRIPTION

[0020] In order to facilitate understanding the utility model, the following will be more comprehensive to the utility model with reference to relevant drawings.

[0021] A kind of battery positive pole foil welding structure, refer to Figure 1 , including two oppositely arranged welding head 10 and the positive pole foil 20 between two welding head 10, two welding head 10 moves towards each other direction close until with positive pole foil 20 contact carries out welding work.

[0022] Refer to Figure 1 , welding head 10 is equipped with at least one welding surface 11, welding surface 11 is provided with welding tooth 12, welding tooth 12 is provided with welding point 121 on the side away from welding surface 11, welding point 121 is protruding from the surface of welding tooth 12, welding point 121 is the position of welding head 10 and positive pole foil 20 contact and weld, welding point 121 can realize the welding with positive pole foil 20 through.

[0023] Further, refer to Figure 1 , the welding point 121 on welding tooth 12 has multiple, multiple welding points 121 are spaced along the length direction of welding tooth 12.Both sides of two welding head 10 mutually are equipped with multiple welding points 121, to simultaneously carry out welding operation to both sides of positive pole foil 20.

[0024] With reference to Figure 1 One side of the welding head 10 is provided with a mounting seat 30 and a driving member, wherein the welding head 10 is fixedly installed on the mounting seat 30, the driving member is installed on the mounting seat 30, the output end of the driving member passes through the mounting seat 30 and is connected with the welding head 10, and the driving member can drive the welding head 10 to move in the vertical direction. It should be noted that the mounting seat 30 supports the welding head 10 and the driving member, thereby ensuring the stability of the driving member and the welding head 10. The mounting seats 30 and the driving members of the two welding heads 10 are respectively arranged on the sides of the two welding heads 10 away from each other, and the two driving members are used to control the two welding heads 10 to move towards each other.

[0025] With reference to Figure 1 In the embodiment, the driving member is a speed regulating cylinder 40, two speed regulating valves are installed on the speed regulating cylinder 40, and the two speed regulating valves are respectively a first speed regulating valve 41 and a second speed regulating valve 42. The first speed regulating valve 41 is used to adjust the retraction speed of the piston rod of the speed regulating cylinder 40, and the second speed regulating valve 42 is used to adjust the advancing speed of the piston rod of the speed regulating cylinder 40. The advancing speed of the welding head 10 controlled by the speed regulating cylinder 40 is adjusted by controlling the second speed regulating valve 42, thereby improving the speed of the welding head 10 to reach the welding position of the positive electrode foil 20. The first speed regulating valve 41 adjusts the speed of the welding head 10 controlled by the cylinder to leave the welding position of the positive electrode foil 20 after the welding head 10 is welded with the positive electrode foil 20. It should be noted that after the two welding heads 10 are welded with the positive electrode foil 20, the welding head 10 and the positive electrode foil 20 need to be slowly separated, thereby solving the problem that the positive electrode foil 20 is welded and cracked due to the adhesion of the positive electrode foil 20 and the welding head 10 when the two are quickly separated. The first speed regulating valve 41 on the speed regulating cylinder 40 connected with the two welding heads 10 is adjusted to reduce the speed of the two welding heads 10 to separate, thereby reducing the problem of the positive electrode foil 20 being welded and cracked.

[0026] Further, with reference to Figure 1The two speed-adjusting cylinders 40 connected with the two welding heads 10 are respectively provided with a control member, which is used to control the speed of the speed-adjusting cylinder 40 to control the speed of the welding head 10 to separate the positive foil 20. Specifically, the two welding heads 10 are respectively a first welding head 101 and a second welding head 102, and the first welding head 101 is located above the second welding head 102. The two control members are respectively a first controller 50 and a second controller 60; the first controller 50 is arranged on the speed-adjusting cylinder 40 connected with the first welding head 101, and the second controller 60 is arranged on the speed-adjusting cylinder 40 connected with the second welding head 102. Among them, the first controller 50 is used to control the speed of the speed-adjusting cylinder 40 connected with the first welding head 101, and the first controller 50 is electrically connected with the first speed-adjusting valve 41 and the second speed-adjusting valve 42 on the speed-adjusting cylinder 40 connected with the first welding head 101; the second controller 60 is used to control the speed of the speed-adjusting cylinder 40 connected with the second welding head 102, and the second controller 60 is electrically connected with the first speed-adjusting valve 41 and the second speed-adjusting valve 42 on the speed-adjusting cylinder 40 connected with the second welding head 102. It should be noted that the speed of the first welding head 101 and the second welding head 102 advancing to the welding position of the positive foil 20 is 800 mm / min, that is, the first controller 50 and the second controller 60 control the second speed-adjusting valve 42 of the speed-adjusting cylinder 40 connected with the first welding head 101 and the second welding head 102 respectively, so that the descending speed of the first welding head 101 and the second welding head 102 reaches 800 mm / min.

[0027] Referring to Figure 1, the first welding head 101 separates from the positive electrode foil 20 at a speed of 20 mm / min after the welding is completed, and the second welding head 102 separates from the positive electrode foil 20 at a speed of 60 mm / min after the welding is completed. It should be noted that the first welding head 101 and the second welding head 102 move away from each other at a speed of 20 mm / min and 60 mm / min respectively after the welding is completed, and then the first welding head 101 and the second welding head 102 move at a speed of 800 mm / min to return to the original position. By adjusting the separation speed of the first welding head 101 and the second welding head 102 after the welding is completed, the problem of the positive electrode foil 20 being adhered to the first welding head 101 and the second welding head 102 during separation is solved. It should be noted that the welding teeth 12 on the first welding head 101 and the second welding head 102 are different. When the positive electrode foil 20 uses a composite foil instead of a metal foil as the current collector of the electrode, the composite foil cannot be directly welded to the tab due to the presence of the polymer layer. Usually, a transition welding method is used to connect the composite foil and the tab, that is, metal foils are spliced on the upper and lower surfaces of the composite foil, and the metal foils are connected to the composite foil by welding to realize current conduction. The welding teeth 12 on the first welding head 101 and the second welding head 102 in this welding method are different, so the separation speed of the first welding head 101 and the second welding head 102 from the positive electrode foil 20 is different, so as to separate from the positive electrode foil 20 without causing the phenomenon of the positive electrode foil 20 being adhered to the welding head 10.

[0028] Further, referring to Figure 1 , after the first welding head 101 and the second welding head 102 complete the welding with the positive electrode foil 20, the first welding head 101 and the second welding head 102 are separated from the positive electrode foil 20 by a distance of 10-15 mm, and then the first welding head 101 and the second welding head 102 are returned at a speed of 800 mm / min.

[0029] Further, referring to Figure 1 , the first welding head 101 and the second welding head 102 are each provided with a CCD detection mechanism 70 for monitoring the welding work. The two CCD detection mechanisms 70 are used to detect whether the welding work of the first welding head 101 and the second welding head 102 with the positive electrode foil 20 is completed, so as to facilitate the control of the separation speed of the first welding head 101 and the second welding head 102 from the positive electrode foil 20. It should be noted that the CCD detection mechanism 70 on the first welding head 101 is electrically connected to the first controller 50, and the CCD detection mechanism 70 on the second welding head 102 is electrically connected to the second controller 60.

[0030] Further, referring to Figure 1The pressing assembly 80 is arranged in the feeding direction of the positive electrode foil 20, and is used for pressing the positive electrode foil 20, wherein the pressing assembly 80 comprises an upper pressing block 81 and a lower pressing block 82, the upper pressing block 81 and the lower pressing block 82 press two opposite outer sides of the positive electrode foil 20 respectively, and the pressing assembly 80 can fix the position of the positive electrode foil 20, thereby improving the welding quality of the positive electrode foil 20.

[0031] The speed of the speed-adjusting cylinder 40 can be adjusted to adjust the separation speed of the two welding heads 10 after the welding with the positive electrode foil 20 is completed, the two welding heads 10 and the positive electrode foil 20 are slowly separated after the first welding head 101 and the second welding head 102 complete the welding with the positive electrode foil 20, and different separation speeds are adopted between the first welding head 101, the second welding head 102 and the positive electrode foil 20, thereby solving the problem that the positive electrode foil 20 is welded and cracked due to the adhesion between the positive electrode foil 20 and the welding head 10 when the separation is fast.

[0032] The above-mentioned embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that, for ordinary skilled person in the art, without departing from the concept of the utility model, a plurality of deformations and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A welding structure for a battery positive electrode foil, characterized in that, The utility model provides a welding head and a welding device, comprising: Two opposite welding heads (10) and a positive electrode foil (20) between the two welding heads (10), the welding head (10) is provided with at least one welding surface (11), the welding surface (11) is provided with a welding tooth (12), the welding tooth (12) is provided with a welding point (121) protruding from the surface of the welding tooth (12) away from the welding surface (11), one side of the welding head (10) is provided with a driving element, the output end of the driving element is connected with the welding head (10), the driving element can drive the welding head (10) to move in the vertical direction, the driving elements of the two welding heads (10) are respectively arranged on the sides of the two welding heads (10) away from each other, and the two driving elements are used for respectively controlling the two welding heads (10) to move towards each other, and the control elements are arranged on the two driving elements, and the control elements are used for controlling the speed of the driving elements to control the speed of the welding head (10) separating the positive electrode foil (20).

2. The battery positive electrode foil welding structure according to claim 1, wherein One side of the welding head (10) is provided with a mounting seat (30), and the welding head (10) is fixedly installed on the mounting seat (30), and the driving element is installed on the mounting seat (30), and the output end of the driving element penetrates through the mounting seat (30) and is connected with the welding head (10).

3. The battery positive electrode foil welding structure according to claim 1, wherein The driving element is a speed regulating cylinder (40), two speed regulating valves are installed on the speed regulating cylinder (40), the two speed regulating valves are respectively a first speed regulating valve (41) and a second speed regulating valve (42), the first speed regulating valve (41) is used for adjusting the retraction speed of the piston rod of the speed regulating cylinder (40), and the second speed regulating valve (42) is used for adjusting the advancing speed of the piston rod of the speed regulating cylinder (40).

4. The battery positive electrode foil welding structure according to claim 3, wherein The two welding heads (10) are respectively a first welding head (101) and a second welding head (102), the first welding head (101) is located above the second welding head (102), the two control elements are respectively a first controller (50) and a second controller (60), the first controller (50) is arranged on the speed regulating cylinder (40) connected with the first welding head (101), the second controller (60) is arranged on the speed regulating cylinder (40) connected with the second welding head (102), the first controller (50) is used for controlling the speed of the speed regulating cylinder (40) connected with the first welding head (101), the first controller (50) is electrically connected with the first speed regulating valve (41) and the second speed regulating valve (42) on the speed regulating cylinder (40) connected with the first welding head (101), the second controller (60) is used for controlling the speed of the speed regulating cylinder (40) connected with the second welding head (102), and the second controller (60) is electrically connected with the first speed regulating valve (41) and the second speed regulating valve (42) on the speed regulating cylinder (40) connected with the second welding head (102).

5. The battery positive electrode foil welding structure according to claim 4, wherein The advancing speed of the first welding head (101) and the second welding head (102) to the welding position of the positive electrode foil (20) is 800mm / min.

6. The battery positive electrode foil welding structure according to claim 4, wherein The first welding head (101) separates from the positive electrode foil (20) at a speed of 20 mm / min after the welding with the positive electrode foil (20) is completed, and the second welding head (102) separates from the positive electrode foil (20) at a speed of 60 mm / min after the welding with the positive electrode foil (20) is completed.

7. The battery positive electrode foil welding structure according to claim 6, wherein After the separation distance of the first welding head (101) and the second welding head (102) from the positive electrode foil (20) reaches 10-15 mm, the retraction speed of the first welding head (101) and the second welding head (102) is 800 mm / min.

8. The battery positive electrode foil welding structure according to claim 4, wherein The first welding head (101) and the second welding head (102) are each provided with a CCD detection mechanism (70) for monitoring the welding work, and the two CCD detection mechanisms (70) are respectively used for detecting whether the welding work of the first welding head (101) and the second welding head (102) with the positive electrode foil (20) is completed, the CCD detection mechanism (70) on the first welding head (101) is electrically connected with the first controller (50), and the CCD detection mechanism (70) on the second welding head (102) is electrically connected with the second controller (60).

9. The battery positive electrode foil welding structure according to claim 1, wherein The welding points (121) on the welding teeth (12) are multiple, and the multiple welding points (121) are distributed along the length direction of the welding teeth (12).

10. The battery positive electrode foil welding structure according to claim 1, wherein A pressing assembly (80) for pressing the positive electrode foil (20) is arranged in the feeding direction of the positive electrode foil (20), and the pressing assembly (80) comprises an upper pressing block (81) and a lower pressing block (82), and the upper pressing block (81) and the lower pressing block (82) press the two opposite outer sides of the positive electrode foil (20) respectively.

Images