Adjustable bonding roller structure

Abstract

The application discloses a structure of an adjustable supporting welding roller, which is applied to an ultrasonic rolling welding mechanism and comprises a supporting welding roller for supporting a welding part of A-face foil, composite current collector and B-face foil, a composite current collector passing roller for supporting a main body of the composite current collector, a supporting welding shaft core and shaft core locking seats arranged at two ends of the supporting welding shaft core. The supporting welding roller and the composite current collector passing roller are arranged side by side, the supporting welding roller is sleeved on the supporting welding shaft core and can rotate along the central axis of the supporting welding shaft core, at least two eccentric outer circular steps are arranged on the supporting welding shaft core, the central axis of the outer circular step is not coaxial with the central axis of the supporting welding shaft core, and the composite current collector passing roller is sleeved on the outer circular step and can rotate along the central axis of the outer circular step. The adjustable supporting welding roller structure can effectively solve the welding deviation problem and improve the welding quality and welding speed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery, and particularly relates to an adjustable welding roller structure. BACKGROUND

[0002] In the production process of lithium batteries, metal foils are usually selected as current collectors, among which aluminum foils are selected as positive current collectors and copper foils are selected as negative current collectors. In order to improve the energy density and safety of the battery, a composite current collector obtained by compounding a high polymer film and a metal plating layer has gradually attracted attention. However, since the composite current collector includes an insulating layer formed of a high polymer material, the tab of the composite current collector cannot output the current in the battery cell to the electrode terminal, which requires the use of foils (aluminum foils or copper foils) to connect the tab of the composite current collector, so as to output the current in the battery cell.

[0003] A kind of ultrasonic wave rolling welding machine is disclosed in Chinese patent for invention with publication number CN108393573A, which includes main frame bottom plate, vertical frame fixed on main frame bottom plate, main shaft system including ultrasonic welding head, amplitude modulator, transducer, anvil device including anvil ring, upper frame body, lower frame body and driving device. Ultrasonic welding head is arranged in center with anvil ring;The first side of upper frame body is used to install main shaft system and anvil device;The second side of lower frame body is used to install main shaft system and anvil device;And driving device is installed on main frame bottom plate, used to drive lower frame body to move up and down. The ultrasonic wave rolling welding machine realizes continuous welding on workpiece through the cooperation of main shaft system and anvil device.

[0004] However, since the thickness of the stack of the tab end of the composite current collector, the A-side foil and the B-side foil can be different from the thickness of the main body of the composite current collector, the ultrasonic wave rolling welding machine of the above-mentioned scheme uses anvil as welding support, and the height of the support surface of the anvil is consistent. If the thickness of the stack of the tab end of the composite current collector, the A-side foil and the B-side foil is different from the thickness of the main body of the composite current collector, the tension and friction force generated on one side of the stack of the tab end of the composite current collector, the A-side foil and the B-side foil and one side of the main body of the composite current collector during the welding process will be different (i.e. the force is different), which will cause the welding to deviate easily and affect the welding quality. SUMMARY

[0005] In order to overcome the problem that the welding anvil in the existing ultrasonic wave rolling welding machine will cause the welding to deviate easily and affect the welding quality when the height of the support surface of the anvil is consistent and the thickness of the stack of the tab end of the composite current collector, the A-side foil and the B-side foil is different from the thickness of the main body of the composite current collector, the present application provides an adjustable welding roller structure.

[0006] The technical scheme of the present application is as follows:

[0007] The adjustable welding roller structure is applied to the ultrasonic rolling welding mechanism, and comprises a welding roller for supporting the welding part of the A-face foil, the composite current collector and the B-face foil, a composite current collector passing roller for supporting the main body of the composite current collector, a welding shaft core and shaft core locking seats arranged at both ends of the welding shaft core. The welding roller and the composite current collector passing roller are arranged side by side, the welding roller is sleeved on the welding shaft core and can rotate along the central axis of the welding shaft core, at least two eccentric outer circular steps are arranged on the welding shaft core, the central axis of the outer circular step is not coaxial with the central axis of the welding shaft core, and the composite current collector passing roller is sleeved on the outer circular step and can rotate along the central axis of the outer circular step.

[0008] According to the adjustable welding roller structure, the height difference between the highest point of the welding roller and the highest point of the composite current collector passing roller is equal to half of the thickness of the main body of the composite current collector minus the thickness of the B-face foil.

[0009] According to the adjustable welding roller structure, the distance between the central axis of the outer circular step and the central axis of the welding shaft core is 0.3-1mm.

[0010] Further, the distance between the central axis of the outer circular step and the central axis of the welding shaft core is 0.5-1mm.

[0011] According to the adjustable welding roller structure, a welding roller seat is arranged at the connection between the welding roller and the welding shaft core, the welding roller seat is sleeved outside the welding shaft core and can rotate along the central axis of the welding shaft core, the welding roller is sleeved outside the welding roller seat and is fixed with the welding roller seat, and the inner side of the welding roller seat is located inside the composite current collector passing roller.

[0012] Further, the welding roller seat is sleeved outside the welding shaft core through a bearing and can rotate along the central axis of the welding shaft core.

[0013] Further, the outer side of the welding roller is provided with a tab seat, the tab seat, the welding roller and the welding roller seat are fixed together through screws, and the outer diameter of the tab seat is the same as the outer diameter of the welding roller.

[0014] Further, a plurality of first screw holes are circumferentially arranged on the tab seat, a plurality of second screw holes corresponding to the first screw holes are circumferentially arranged on the welding roller, and a plurality of third screw holes corresponding to the first screw holes are circumferentially arranged on the inner side of the welding roller seat, and screws pass through the corresponding first screw holes, second screw holes and third screw holes to fix the tab seat, the welding roller and the welding roller seat together.

[0015] Further, the composite current collector roller is sleeved on the outer circular step through a bearing sleeve.

[0016] Further, the welding shaft core is sleeved through the corresponding shaft core locking seat, and the sleeved part is provided with an adjusting groove for matching an eccentric adjusting tool to rotate the welding shaft core.

[0017] Further, the shaft core locking seat comprises an upper locking block and a lower fixed base, and the junction of the upper locking block and the lower fixed base is provided with a locking hole matched with the two ends of the welding shaft core, and the upper locking block is connected with the lower fixed base through a screw to lock the welding shaft core in the locking hole.

[0018] Further, the four corners of the upper locking block are provided with fourth screw holes, and the top four corners of the lower fixed base are provided with fifth screw holes matched with the corresponding fourth screw holes, and the upper locking block and the lower fixed base are fixed together through a screw passing through the corresponding fourth screw hole and fifth screw hole.

[0019] Further, the welding wheel is provided below with a bearing wheel assembly, and the bearing wheel assembly comprises a bearing base and two bearing wheels rotatably arranged on the bearing base, and the wheel surfaces of the two bearing wheels are respectively in contact with the two sides of the lower wheel surface of the welding wheel.

[0020] Further, the wheel surface width of the bearing wheel is consistent with the wheel surface width of the welding wheel.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1. By arranging the welding wheel and the composite current collector roller side by side, the welding wheel is used to support the welding part of the A-side foil, the composite current collector and the B-side foil, and the composite current collector roller is used to support the main body of the composite current collector, so that the tension and friction generated on one side of the A-side foil, the B-side foil and the tab end of the composite current collector after being overlapped can be the same as the tension and friction generated on one side of the main body of the composite current collector, and the welding deviation problem can be effectively solved, and the welding quality and welding speed can be improved.

[0023] 2. By arranging the outer circular step on the welding shaft core, the height of the composite current collector roller sleeved on the outer circular step can be changed by rotating the welding shaft core, so that the height difference between the highest point of the composite current collector roller and the highest point of the welding wheel can be adjusted to adapt to A-side foils, B-side foils and composite current collectors of different thicknesses, and the versatility of the equipment can be improved.

[0024] 3, set up with shaft core locking seat locking bearing shaft core, avoid in welding over bearing shaft core rotation, only need to adjust the height difference between the highest point of the composite current collector roller and the highest point of the bearing welding wheel, the shaft core locking seat will release the bearing shaft core, so that the bearing shaft core can rotate freely. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to make the technical problems to be solved in the embodiments of the present application, the technical solutions and beneficial effects more clearly, the following will be further described in detail. It should be noted that similar numbers and letters in the following drawings represent similar items, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, it is declared that the following described embodiments are only for explaining the present application, and not for limiting the present application.

[0026] Figure 1 is a structural diagram of the present application;

[0027] Figure 2 is a sectional view of the present application;

[0028] Figure 3 is a side view of the bearing welding shaft core in the present application;

[0029] Figure 4 is a front view of the bearing welding shaft core in the present application;

[0030] Figure 5 is Figure 4 is a sectional view of H-H;

[0031] Figure 6 is a structural diagram of the bearing wheel assembly in the present application.

[0032] In the drawings,

[0033] 1, bearing welding wheel; 2, composite current collector roller; 3, bearing welding shaft core; 31, outer circular step; 32, adjusting groove; 4, shaft core locking seat; 41, upper locking block; 42, lower fixed base; 5, welding wheel seat; 6, lug seat; 7, bearing wheel assembly; 71, bearing base; 72, bearing wheel. DETAILED DESCRIPTION

[0034] In order to make the technical problems to be solved in the embodiments of the present application, the technical solutions and beneficial effects more clearly, the following will be further described in detail. It should be noted that similar numbers and letters in the following drawings represent similar items, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, it is declared that the following described embodiments are only for explaining the present application, and not for limiting the present application.

[0035] It should be noted that the terms "mounting", "arrangement", "connection", "fixing" and the like should be interpreted broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited.

[0036] The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship commonly placed when the product of the application is used, which is only for the convenience of describing the application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. The terms "first", "second", "third", "fourth", "fifth" are only for the purpose of convenient description, and cannot be understood as indicating or implying relative importance or implying the number of technical features. The meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0037] Please refer to Figure 1 、 Figure 2 The embodiment provides an adjustable welding roller structure applied to an ultrasonic rolling welding mechanism, which comprises a welding roller 1 and a composite current collector roller 2 arranged side by side, the welding roller 1 is used for supporting the welding part of an A-face foil, a composite current collector and a B-face foil, the composite current collector roller 2 is used for supporting the main body of the composite current collector, and the height difference between the highest point of the welding roller 1 and the highest point of the composite current collector roller 2 is equal to half the thickness of the main body of the composite current collector minus the thickness of the B-face foil. Since the thickness of the A-face foil, the B-face foil and the tab end of the composite current collector after superposition may be different from the thickness of the main body of the composite current collector, if the height of the welding support surface is consistent and the thickness of the A-face foil, the B-face foil and the tab end of the composite current collector after superposition is different from the thickness of the main body of the composite current collector, the tension and friction force generated on one side of the A-face foil, the B-face foil and the tab end of the composite current collector after superposition and one side of the main body of the composite current collector are different (that is, the stress is different), the welding is easy to deviate, and the welding quality is affected. Through the welding roller 1 and the composite current collector roller 2 arranged as described above, it can be ensured that the tension and friction force generated on one side of the A-face foil, the B-face foil and the tab end of the composite current collector after superposition and one side of the main body of the composite current collector are the same, the welding deviation problem can be effectively solved, and the welding quality and welding speed are improved.

[0038] Please refer to Figures 1 to 5In the embodiment, the adjustable supporting and welding roller structure further comprises a supporting and welding shaft core 3 and a shaft core locking seat 4 arranged at both ends of the supporting and welding shaft core 3. The supporting and welding roller 1 is sleeved on the supporting and welding shaft core 3 and can rotate along the central axis of the supporting and welding shaft core 3. An eccentric outer circular step 31 is arranged on the supporting and welding shaft core 3, and the central axis of the outer circular step 31 is not coaxial with the central axis of the supporting and welding shaft core 3. The composite current collector roll 2 is sleeved on the outer circular step 31 and can rotate along the central axis of the outer circular step 31. By arranging the outer circular step 31 on the supporting and welding shaft core 3, which is not coaxial with the supporting and welding shaft core 3, rotating the supporting and welding shaft core 3 can change the height of the composite current collector roll 2 sleeved on the outer circular step 31, so that the height difference between the highest point of the composite current collector roll 2 and the highest point of the supporting and welding roller 1 can be adjusted to adapt to A-face foil, B-face foil and composite current collector of different thicknesses, and the versatility of the equipment is improved. The shaft core locking seat 4 is used to lock the supporting and welding shaft core 3 to avoid rotating the supporting and welding shaft core 3 during welding. Only when it is necessary to adjust the height difference between the highest point of the composite current collector roll 2 and the highest point of the supporting and welding roller 1, the shaft core locking seat 4 releases the supporting and welding shaft core 3, so that the supporting and welding shaft core 3 can rotate freely.

[0039] Further, the distance between the central axis of the outer circular step 31 and the central axis of the supporting and welding shaft core 3 is 0.3-1mm. Preferably, the distance between the central axis of the outer circular step 31 and the central axis of the supporting and welding shaft core 3 is 0.5-1mm, so that the height adjustment range of the composite current collector roll 2 meets most of the A-face foil, B-face foil and composite current collector on the market.

[0040] Please refer to Figure 1 , Figure 2 Further, a welding roller seat 5 is arranged at the connection between the supporting and welding roller 1 and the supporting and welding shaft core 3. The welding roller seat 5 is sleeved on the outside of the supporting and welding shaft core 3 through a bearing and can rotate along the central axis of the supporting and welding shaft core 3. The supporting and welding roller 1 is sleeved on the outside of the welding roller seat 5 and is fixed with the welding roller seat 5. The inside of the welding roller seat 5 is located inside the composite current collector roll 2. The outside of the supporting and welding roller 1 is provided with a tab seat 6, and the outer diameter of the tab seat 6 is the same as that of the supporting and welding roller 1. The tab seat 6 plays a role in auxiliary supporting the A-face foil, B-face foil and composite current collector. The tab seat 6, supporting and welding roller 1 and welding roller seat 5 are fixed together by screws. Therefore, when the supporting and welding roller 1 needs to be replaced, the screws on the tab seat 6 are unscrewed, and the supporting and welding roller 1 can be taken out and replaced with a new one. Specifically, the tab seat 6 is circumferentially provided with a plurality of first screw holes. The supporting and welding roller 1 is circumferentially provided with a plurality of second screw holes corresponding to the first screw holes. The inside of the welding roller seat 5 is circumferentially provided with a plurality of third screw holes corresponding to the first screw holes. Screws pass through the corresponding first screw holes, second screw holes and third screw holes to fix the tab seat 6, supporting and welding roller 1 and welding roller seat 5 together.

[0041] Further, the composite current collector roller 2 is sleeved on the outer circular step 31 through a bearing sleeve, so that the composite current collector roller 2 can rotate along the central axis of the outer circular step 31, and at least two outer circular steps 31 are arranged on the bearing and welding shaft core 3 to ensure the stability of the rotation of the bearing and welding shaft core 3.

[0042] Please refer to Figure 1 , Figure 2 Further, at least one end of the bearing and welding shaft core 3 passes through the corresponding shaft core locking seat 4, and the passing part is provided with an adjusting groove 32 for rotating the bearing and welding shaft core 3 by matching an eccentric adjusting tool. After the shaft core locking seat 4 is loosened, the eccentric adjusting tool is inserted into the adjusting groove 32, and the bearing and welding shaft core 3 can be easily rotated.

[0043] Please refer to Figure 1 Further, the shaft core locking seat 4 comprises an upper locking block 41 and a lower fixed base 42, and the junction of the upper locking block 41 and the lower fixed base 42 is provided with a locking hole matched with the two ends of the bearing and welding shaft core 3. The upper locking block 41 is connected with the lower fixed base 42 by a screw and locks the bearing and welding shaft core 3 in the locking hole. The bearing and welding shaft core 3 can be loosened by unscrewing the screw, and the bearing and welding shaft core 3 can be rotated at this time. Specifically, the four corners of the upper locking block 41 are provided with fourth screw holes, and the top four corners of the lower fixed base 42 are provided with fifth screw holes matched with the corresponding fourth screw holes. The upper locking block 41 and the lower fixed base 42 can be fixed together by the screw passing through the corresponding fourth screw hole and fifth screw hole.

[0044] Please refer to Figure 1 , Figure 2 , Figure 6 Further, the bearing and welding wheel 1 is provided below with a bearing wheel assembly 7, which plays a role of supporting the bearing and welding wheel 1 during the welding process. Since a certain pressure needs to be given during the ultrasonic welding process, if the lower part of the bearing and welding wheel 1 is not supported, it is easy to cause the bearing and welding shaft core 3 to be bent during the welding process, that is, to affect the welding quality and to need to be replaced frequently. Specifically, the bearing wheel assembly 7 comprises a bearing base 71 and two bearing wheels 72 rotatably arranged on the bearing base 71. The wheel surfaces of the two bearing wheels 72 are respectively in contact with the two sides of the lower wheel surface of the bearing and welding wheel 1, thereby playing a role of supporting the bearing and welding wheel 1 without affecting the normal rotation of the bearing wheel 72. At the same time, the wheel surface width of the bearing wheel 72 is consistent with the wheel surface width of the bearing and welding wheel 1, so that the bearing wheel 72 can be avoided from affecting the composite current collector roller 2 beside it.

[0045] It should be understood that those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

[0046] The patent of the application is exemplarily described above in combination with the drawings, and it is obvious that the implementation of the patent of the application is not limited by the above-mentioned mode, as long as various improvements are made by adopting the method concept and technical scheme of the patent of the application, or the concept and technical scheme of the patent of the application is directly applied to other occasions without improvement, which are all within the protection scope of the patent of the application.

Claims

1. An adjustable welding roller structure, applied in an ultrasonic rolling welding mechanism, characterized in that, The device includes a welding wheel for supporting the welding section of the A-side foil, the composite current collector, and the B-side foil; a composite current collector guide roller for supporting the main body of the composite current collector; a welding shaft core; and shaft core locking seats disposed at both ends of the welding shaft core. The welding wheel and the composite current collector guide roller are arranged side by side. The welding wheel is sleeved on the welding shaft core and can rotate along the central axis of the welding shaft core. The welding shaft core is provided with at least two eccentric outer circular steps. The central axis of the outer circular steps is not coaxial with the central axis of the welding shaft core. The composite current collector guide roller is sleeved on the outer circular steps and can rotate along the central axis of the outer circular steps. The height difference between the highest point of the welding roller and the highest point of the composite current collector roller is equal to half the thickness of the main body of the composite current collector minus the thickness of the B-side foil. At least one end of the welding shaft passes through the corresponding shaft locking seat, and the part that passes through is provided with an adjustment groove that cooperates with the eccentric adjustment tool to rotate the welding shaft. A welding wheel seat is provided at the connection between the welding wheel and the welding shaft. The welding wheel seat is sleeved on the outside of the welding shaft and can rotate along the central axis of the welding shaft. The welding wheel is sleeved on the outside of the welding wheel seat and fixed to the welding wheel seat. The inside of the welding wheel seat is located inside the composite current collector roller. An electrode lug seat is provided on the outside of the welding wheel. The electrode lug seat, the welding wheel, and the welding wheel seat are fixed together by screws, and the outer diameter of the electrode lug seat is the same as the outer diameter of the welding wheel. A load-bearing wheel assembly is provided below the welding wheel. The load-bearing wheel assembly includes a load-bearing base and two load-bearing wheels rotatably mounted on the load-bearing base. The wheel surfaces of the two load-bearing wheels respectively contact the two sides of the lower wheel surface of the welding wheel.

2. The adjustable welding roller structure according to claim 1, characterized in that, The distance between the central axis of the outer circular step and the central axis of the welding core is 0.3-1mm.

3. The adjustable welding roller structure according to claim 1, characterized in that, The electrode holder has a plurality of first screw holes circumferentially arranged, the welding wheel has a plurality of second screw holes circumferentially arranged, corresponding to the first screw holes, and the inner circumferential side of the welding wheel holder has a plurality of third screw holes corresponding to the first screw holes. Screws pass through the corresponding first screw holes, second screw holes, and third screw holes to fix the electrode holder, the welding wheel, and the welding wheel holder together.

4. The adjustable welding roller structure according to claim 1, characterized in that, The shaft locking seat includes an upper locking block and a lower fixed base. The upper locking block and the lower fixed base are provided with locking holes that mate with both ends of the weldable shaft. The upper locking block is connected to the lower fixed base by screws and locks the weldable shaft in the locking holes.

5. The adjustable welding roller structure according to claim 1, characterized in that, The width of the load-bearing wheel is the same as the width of the welding wheel.

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