Tab bending assembly, tab bending device and battery cell winding equipment

Abstract

The utility model discloses a tab bending assembly, a tab bending device and battery cell winding equipment, the tab bending assembly comprises a connecting rod, the connecting rod is provided with a rotatable roller, and the roller is used for bending a tab of a battery cell; the air blowing pipe is mounted on the connecting rod, and the air blowing pipe is used for blowing the tab to be bent towards the axis of the battery cell. According to the technical scheme provided by the invention, the bending reliability of the tab can be improved, so that the yield of the battery cell is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of battery manufacturing equipment, and specifically relates to a tab bending assembly, a tab bending device, and a battery cell winding device. Background Art

[0002] During the manufacturing process of lithium batteries, the material strip (including positive electrode sheets, negative electrode sheets and separators) needs to be wound to form a battery cell.

[0003] Several pole tabs are set or formed on the positive electrode sheet and the negative electrode sheet, and the multiple pole tabs are cut into a pole tab of small width on the pole sheet by laser, and only a slit of, for example, 0.1 mm or other width is cut between the pole tabs. During the winding process of the pole sheet, it is necessary to use a roller to bend the multiple pole tabs on the pole sheet inward toward the axis direction of the battery cell (that is, the center direction of the cross section of the battery cell). Because the pole tabs on the pole sheet may have turned outward (that is, away from the center direction of the cross section of the battery cell) before the pole sheet reaches the winding needle, if the roller continues to bend the pole tabs, the pole tabs will eventually turn outward, affecting the reliability of the pole tab bending, thereby reducing the battery cell yield.

[0004] Therefore, it is necessary to improve the tab bending assembly. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a tab bending assembly, a tab bending device and a battery cell winding device.

[0006] According to a first aspect of an embodiment of the present application, a tab bending assembly is provided, comprising:

[0007] A connecting rod, wherein a rotatable roller is mounted on the connecting rod, and the roller is used to bend the tab of the battery cell;

[0008] An air blowing pipe is installed on the connecting rod and is used to blow the tab to bend it toward the axis of the battery cell.

[0009] Optionally, in the conveying direction of the pole piece, the blowing port of the blowing pipe is located upstream of the roller.

[0010] Optionally, the roller has a rolling surface, the rolling surface is used to abut against the tab, the rolling surface has an edge line, and the projection of the edge line along the first direction at least partially falls into the blowing port of the blowing pipe.

[0011] Optionally, the air pipe is mounted on the connecting rod via an air pipe fixing clamp.

[0012] Optionally, the connecting rod is fixed to the connecting rod locking block, and the connecting rod locking block is slidably connected to the first support through a first guide rod. A first elastic member is arranged between the connecting rod locking block and the first support, and the first elastic member provides a pre-tightening force to make the roller have a movement tendency along the first direction approaching the pole ear.

[0013] Optionally, the tab bending assembly further includes:

[0014] a fixed block, the first support being rotatably connected to the fixed block;

[0015] A second elastic member is provided between the first support and the fixed block, and provides a pre-tightening force to cause the roller to move toward the tab along a second direction; the first direction intersects with the second direction.

[0016] According to a second aspect of an embodiment of the present application, a tab bending device is provided, comprising:

[0017] At least two tab bending assemblies as described in any of the above items;

[0018] A second support, the tab bending assembly is connected to the second support;

[0019] A first driving member is connected to the second support, and the first driving member can drive the second support to move closer to or away from the axis of the battery cell.

[0020] Optionally, the tab bending device further comprises a third support, the third support being slidably connected to the second support via a second guide rod, and at least two tab bending assemblies are mounted on the third support;

[0021] The second support is equipped with a second driving member, which can drive the third support to move the roller toward or away from the axis of the battery cell.

[0022] Optionally, the fixing block of the tab bending assembly is provided with a waist-shaped hole, the axis of the waist-shaped hole extends along the distance direction between the two tab bending assemblies, and the third support is provided with multiple locking holes, and the locking piece is inserted into the waist-shaped hole and the locking hole and then locked, and the fixing block can adjust the distance between the two tab bending assemblies through the waist-shaped hole and the locking hole.

[0023] Optionally, the tab bending device further includes a cutter assembly, a pressure roller assembly, a third drive member and a fourth drive member, the cutter assembly slidingly cooperates with the second support, the pressure roller assembly sliding cooperates with the second support, the third drive member is installed on the second support, the fourth drive member is installed on the second support, the third drive member is used to drive the cutter assembly to move, the fourth drive member is used to drive the pressure roller assembly to move, and the cutter assembly is located between the tab bending assembly and the pressure roller assembly.

[0024] According to a third aspect of an embodiment of the present application, a battery cell winding device is provided, comprising:

[0025] A turret, on which a winding needle is mounted, for winding the strip into a battery cell;

[0026] As described in any one of the above-mentioned tab bending devices, the tab bending assembly of the tab bending device can bend the tab.

[0027] One technical effect of the embodiment of the present application is that, since the air blow pipe and the roller are installed on the connecting rod together, the air blow pipe blows the tabs to bend toward the axis L of the battery cell, that is, toward the center of the end face of the battery cell, and the roller presses against the tabs to bend them. In this way, even if the tabs of the electrode sheet have already turned outward before being wound by the winding needle, these turned-out tabs will first be blown back to the inward-turned state toward the axis of the battery cell by the air blow pipe, and then the connecting rod will drive the roller to press against the tabs to bend them, ensuring that the tabs of the battery cell are bent to the inward-turned state during the winding process of the battery cell. Therefore, the bending reliability of the tabs is improved, and the yield rate of the wound battery cell is also correspondingly improved.

[0028] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0030] Figure 1 A three-dimensional diagram of a tab bending assembly in an embodiment of the present application;

[0031] Figure 2 This is a front view of the tab bending assembly in an embodiment of the present application;

[0032] Figure 3 A top view of the tab bending assembly in an embodiment of the present application;

[0033] Figure 4 Schematic diagram of the working state of two tab bending assemblies in an embodiment of the present application;

[0034] Figure 5 for Figure 4 A partial enlarged view of

[0035] Figure 6 Schematic diagram of the projection relationship between the air outlet and the edge line;

[0036] Figure 7 This is a schematic diagram of the working status of the tab bending device in one embodiment of the present application.

[0037] Description of reference numerals:

[0038] 100, tab bending assembly; 101, connecting rod; 102, roller; 103, air blow pipe; 1031, air blow port; 104, air pipe fixing clamp; 105, rolling surface; 106, gap; 107, connecting rod locking block; 108, first support; 109, first guide rod; 110, first elastic member; 111, fixing block; 1111, waist-shaped hole; 1112, protrusion; 112, rotating shaft; 113, second elastic member; 114, edge line;

[0039] 200, tab bending device; 201, second support; 202, first drive member; 203, third support; 2031, locking hole; 204, second guide rod; 205, second drive member; 206, cutter assembly; 207, pressure roller assembly; 208, third drive member; 209, fourth drive member; 210, mounting plate; 211, slide rail;

[0040] 300, rolling needle;

[0041] 400, battery cell; 401, tab. DETAILED DESCRIPTION

[0042] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0043] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0044] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0045] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0046] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0047] It should be noted that although the material strips, battery cells, tabs, pole pieces, diaphragms, etc. are described in this application, the purpose is only to more clearly illustrate the working principles of the tab bending assembly 100, the tab bending device 200 and the winding equipment. The material strips, battery cells, tabs, pole pieces, and diaphragms cannot be regarded as part of the tab bending assembly 100, the tab bending device 200 and the winding equipment.

[0048] First of all, it should be noted that the first direction, the second direction and the third direction mentioned in the embodiments of the present application are directions that intersect with each other in three-dimensional space. This is to illustrate the relative position relationship. Please refer to the specific drawings. The direction description is only for the convenience of explaining the embodiments of the present application and is not a limitation.

[0049] In the following description, each driving component can adopt various driving modes such as motor screw driving, cylinder driving, etc.

[0050] like Figures 1 to 4 As shown, according to the first aspect of an embodiment of the present application, a tab bending assembly 100 is provided, comprising: a connecting rod 101, wherein the connecting rod 101 is equipped with a rotatable roller 102, and the roller 102 is used to bend the tab 401 of the battery cell 400; and an air blow pipe 103, wherein the air blow pipe 103 is installed on the connecting rod 101, and the air blow pipe 103 is used to blow the tab 401 toward the axis of the battery cell 400 to bend it.

[0051] Specifically, the connecting rod 101 mainly plays a supporting role for the roller 102, and can also support the air blowing pipe 103 in the embodiment described below. After the roller 102 is installed on the connecting rod 101, the roller 102 can rotate around its own axis, so that the tab 401 is bent during the winding process of the battery cell 400. The air blowing pipe 103 is externally connected to an air supply mechanism, so that the air blowing pipe 103 can blow air towards the tab 401. The air blowing pipe 103 is installed on the connecting rod 101 and can move synchronously with the roller 102 as the connecting rod 101 moves, thereby cooperating with the roller 102 to complete the bending of the tab 401. The air blowing pipe 103 is used to blow the tab 401 to bend toward the axis L of the battery cell 400, that is, to bend toward the center of the end face of the battery cell 400. In this way, even if the pole tabs 401 of the electrode sheet have been turned outward before being wound by the winding needle 300, these turned-out pole tabs 401 will be blown back to the inward-turned state bent toward the axis of the battery cell 400 by the blowing tube 103, and the roller 102 will abut the pole tabs 401 for the final bending, ensuring that the pole tabs 401 of the battery cell 400 are bent to the inward-turned state during the battery cell winding process. Therefore, the bending reliability of the pole tabs 401 is improved, and the yield rate of the wound battery cell 400 is also improved accordingly.

[0052] In one embodiment of the present application, in the conveying direction of the electrode, that is, in the direction of the electrode toward Figure 4 In the direction of the winding needle 300 being transported for winding, the blowing port 1031 of the blowing pipe 103 is located upstream of the roller 102.

[0053] Specifically, the pole piece is facing Figure 4 In the direction of conveying and winding by the winding needle 300, the blowing port 1031 of the blowing tube 103 is located upstream of the roller 102, which means that the relative position of the blowing port 1031 and the roller 102 is designed so that the pole tab 401 is blown through the blowing port 1031 before it abuts against the roller 102, so that the pole tab 401 is bent toward the axis L of the battery cell 400, ensuring that all the pole tabs 401 will not turn outward.

[0054] like Figures 1 to 3 As shown, in the embodiment of the present application, the air pipe 103 is installed on the connecting rod 101 through the air pipe fixing clamp 104.

[0055] Specifically, the air pipe fixing clamp 104 can be in the form of a clamp or a pipe clamp. The air pipe 103 is mounted on the connecting rod 101 through the air pipe fixing clamp 104, so that the relative position between the air port 1031 of the air pipe 103 and the roller 102 can be adjusted, and the tab bending assembly 100 is easy to assemble.

[0056] like Figure 1 、 Figure 3 、 Figure 4 and Figure 5 、 Figure 6As shown, the roller 102 has a rolling surface 105 for contacting the tab 401 . The rolling surface 105 has an edge line 114 , and the projection of the edge line 114 along the first direction at least partially falls into the blowing port 1031 of the blowing pipe 103 .

[0057] Specifically, if Figure 5 As shown, in the working state, the rolling surface 105 of the roller 102 is used to abut the tab 401 of the battery cell 400, applying pressure to the tab 401, causing the tab 401 to bend toward the axis L of the battery cell 400. The rolling surface 105 has an edge line 114, which can be regarded as the dividing line between the roller 102 and the connecting rod 101, and there is a gap 106 between the edge line 114 and the connecting rod 101. The blowing port 1031 is located on the side of the roller 102 away from the axis L of the battery cell 400. Figure 6 As shown, for example, by adjusting the air tube fixing clamp 104, or positioning the roller 102 and the air blowing tube 103 at the beginning of installation, the projection of the edge line 114 along the first direction (which is also the axial direction of the connecting rod 101), that is, the orthographic projection of the edge line 114 onto the plane perpendicular to the first direction, at least partially falls into the air blowing port 1031 of the air blowing tube 103. In this way, due to the separation of the edge line 114, the air flow blown out of the air blowing port 1031 ( Figure 5 The airflow is divided after encountering the roller 102. Part of the airflow flows through the gap 106 between the connecting rod 101 and the roller 102, generating air pressure at the top of the tab 401, and the other part of the airflow flows through the rolling surface 105, generating air pressure on the side of the tab 401, thereby ensuring that the outward-turned tab 401 will be blown toward the axis L of the battery cell 400 and turned inward.

[0058] like Figures 1 to 4 As shown, in an embodiment of the present application, the connecting rod 101 is fixed to the connecting rod locking block 107, the connecting rod locking block 107 is slidingly connected to the first support 108 through the first guide rod 109, and a first elastic member 110 is arranged between the connecting rod locking block 107 and the first support 108, and the first elastic member 110 provides a pre-tightening force to make the roller 102 generate a movement trend along the first direction close to the pole ear 401.

[0059] Specifically, the connecting rod 101 is inserted into the connecting rod locking block 107 and locked in place. The connecting rod locking block 107 is also fixedly connected to a first guide rod 109, which passes through a through-hole in the first support 108, thereby achieving a sliding fit between the connecting rod locking block 107 and the first support 108. In this embodiment of the present application, two first guide rods 109 are used, but the number of first guide rods 109 can be increased or decreased as needed. Furthermore, the connecting rod 101 itself can also serve as the first guide rod 109 as needed. A first elastic member 110 is sleeved onto one of the first guide rods 109 and positioned between the connecting rod locking block 107 and the first support 108. In other embodiments of the present application, the first elastic member 110 can also be sandwiched between the connecting rod locking block 107 and the first support 108. The first elastic member 110 can be a coil spring, an air spring, a spring clip, or the like.

[0060] like Figure 4 As shown, when the first support 108 needs to drive the roller 102 to move in the first direction (i.e., the axial direction of the connecting rod 101) to approach the tab 401, the first elastic member 110 will provide a preload force between the first support 108 and the connecting rod locking block 107. This preload force will push the connecting rod locking block 107 to move in the first direction, thereby pushing the connecting rod 101 and the roller 102 to generate a movement trend in the first direction toward the tab 401. When the roller 102 abuts against the tab 401 to bend the tab 401, the first elastic member 110 will also provide a preload force in the first direction to the roller 102, so that the roller 102 can always abut against the tab 401.

[0061] like Figures 1 to 4 As shown, in this embodiment of the present application, the tab bending assembly 100 further includes a fixed block 111 and a second elastic member 113. The first support 108 is rotatably connected to the fixed block 111; the second elastic member 113 is disposed between the first support 108 and the fixed block 111. The second elastic member 113 provides a preload force to cause the roller 102 to move toward the tab 401 in a second direction. The first direction and the second direction intersect.

[0062] Specifically, the first support 108 can rotate around the rotating shaft 112. The rotating shaft 112 can be a shaft fixed on the first support 108, and the rotating shaft 112 rotates with the fixed block 111; the rotating shaft 112 can also be a shaft fixed on the fixed block 111, and the rotating shaft 112 rotates with the first support 108; the rotating shaft 112 can also be an independent shaft, which passes through the through hole of the first support 108 and is fastened to the fixed block 111. Therefore, as long as the rotating shaft 112 can realize the rotational connection between the first support 108 and the fixed block 111, the specific form is not limited. The second elastic member 113 can be a coil spring, a spring, or other element that can provide elastic force. As Figure 1 and Figure 3As shown, the fixing block 111 is provided with a protrusion 1112 , and the second elastic member 113 is provided between the protrusion 1112 and the first support 108 .

[0063] exist Figure 4 In the process of winding, if the pole piece moves along the axis L of the battery cell 400 (ie, along Figure 4 The second direction of movement is shown), the tab 401 generates a pressing force on the roller 102 along the second direction (i.e., the direction of the axis L of the battery cell 400), and the roller 102 correspondingly generates a movement tendency along the second direction away from the tab 401. The second elastic member 113 provides a pre-tightening force at this time, so that the roller 102 generates a movement tendency along the second direction close to the tab 401. The roller 102 always maintains contact with the tab 401 and bends, so it will not collide with the subsequent tab 401 to be bent, thereby avoiding the tab 401 to be bent from turning outward, improving the tab bending reliability, and improving the battery cell yield.

[0064] like Figure 7 As shown, according to the second aspect of the present application, a tab bending device 200 is provided, comprising at least two of the above-mentioned tab bending assemblies 100; a second support 201, wherein the tab bending assembly 100 is connected to the second support 201; and a first driving member 202, wherein the first driving member 202 is connected to the second support 201, and the first driving member 202 can drive the second support 201 close to or away from the axis L of the battery cell 400.

[0065] Specifically, if Figure 4 As shown, during the process of winding the strip by the winding needle 300 to form the battery cell 400, the two tab bending assemblies 100 are respectively used to bend the tabs 401 at both ends of the battery cell 400. The first driving member 202 is connected to the second support 201. The first driving member 202 can drive the second support 201 to move toward or away from the axis of the battery cell 400 (i.e., the first direction), thereby simultaneously driving the two tab bending assemblies 100 to move.

[0066] When the tab 401 needs to be bent, the first driver 202 first drives the two tab bending assemblies 100 to simultaneously move closer to the axis L of the battery cell 400, entering the bending state. As the battery cell 400 is wound, the diameter of the battery cell 400 gradually increases. The first driver 202 can drive the two tab bending assemblies 100 to move simultaneously away from the axis L of the battery cell 400 to adapt to the gradually increasing diameter of the battery cell 400.

[0067] In one embodiment, the first driving member 202 can be driven by a motor guide rail, a motor screw, a gear transmission or a chain transmission. The first driving member 202 can be installed on the mounting plate 210, and the second support 201 slides with the slide rail 211 on the mounting plate 210.

[0068] like Figure 7 As shown, in one embodiment of the present application, the tab bending device 200 further includes a third support 203. The third support 203 is slidably connected to the second support 201 via a second guide rod 204, and at least two tab bending assemblies 100 are mounted on the third support 203. The second support 201 is mounted with a second driving member 205, which can drive the third support 203 to move the roller 102 toward or away from the axis L of the battery cell 400.

[0069] Specifically, in this embodiment, the tab bending assembly 100 is not directly connected to the second support 201, but is first installed on the third support 203, and then indirectly connected to the second support 201 through the third support 203. The second guide rod 204 is fixedly connected to the third support 203, and the second guide rod 204 passes through the through hole of the second support 201 and can slide in the through hole. Therefore, the third support 203 can slide relative to the second support 201, and accordingly, the two tab bending assemblies 100 can also slide relative to the second support 201. Taking the second driving member 205 as an example, the movable end of the cylinder piston rod is installed on the second support 201, and the cylinder body of the cylinder is installed on the third support 203. The extension and retraction of the piston rod can drive the third support 203 to slide relative to the second support 201, thereby causing the roller 102 to move in the first direction toward or away from the axis L of the battery cell 400. The two tab bending assemblies 100 move synchronously, so that the tabs 401 at both ends of the battery cell 400 can be bent synchronously. In other embodiments of the present application, the second driving member 205 can also drive the third support 203 through a structure such as a motor screw.

[0070] like Figure 1 、 Figure 3 、 Figure 4 and Figure 7 As shown, the fixing block 111 of the tab bending assembly 100 is provided with a waist-shaped hole 1111, the axis of which extends along the distance between the two tab bending assemblies 100. The third support 203 is provided with a plurality of locking holes 2031, and the locking member is inserted into the waist-shaped hole 1111 and the locking hole 2031 and then locked. The fixing block 111 can adjust the distance between the two tab bending assemblies 100 through the waist-shaped hole 1111 and the locking hole 2031.

[0071] Specifically, the locking member can be a bolt or a bayonet. A waist-shaped hole 1111 is formed on the fixing block 111. The axis of the waist-shaped hole 1111 extends along the distance between the two tab bending assemblies, that is, the long axis of the waist-shaped hole 1111 extends along the second direction. The locking member can pass through the waist-shaped hole 1111, so that the locking member can move relative to the locking position of the waist-shaped hole 1111 to adjust the distance between the two tab bending assemblies 100, thereby accommodating material strips of different sizes. The third support 203 is provided with a plurality of locking holes 2031, at least two of which are arranged along the second direction. The locking piece is inserted into the waist-shaped hole 1111 and the locking hole 2031 and then locked. By adjusting the locking position of the locking piece relative to the waist-shaped hole 1111 and inserting the locking piece into different locking holes 2031 in the second direction, the distance between the two tab bending assemblies 100 can be adjusted to adapt to material strips of different sizes and the winding of battery cells 400 of different lengths.

[0072] like Figure 7 As shown, the tab bending device 200 further includes a cutter assembly 206, a pressure roller assembly 207, a third driving member 208, and a fourth driving member 209. The cutter assembly 206 is in sliding engagement with the second support 201, the pressure roller assembly 207 is in sliding engagement with the second support 201, the third driving member 208 is mounted on the second support 201, and the fourth driving member 209 is mounted on the second support 201. The third driving member 208 is used to drive the cutter assembly 206 to move, and the fourth driving member 209 is used to drive the pressure roller assembly 207 to move. The cutter assembly 206 is located between the tab bending assembly 100 and the pressure roller assembly 207.

[0073] Specifically, the cutter assembly 206 is used to cut the material strip, and the pressure roller assembly 207 is used to fix the material strip when the cutter assembly 206 cuts the material strip, thereby facilitating cutting. The cutter assembly 206 and the pressure roller assembly 207 can both slide with the second support 201 through guide rods, guide rails, etc. The third drive member 208 and the fourth drive member 209 are both mounted on the second support 201. The third drive member 208 and the fourth drive member 209 can be driven by a cylinder or a motor screw. The third drive member 208 can drive the cutter assembly 206 to move relative to the second support 201 to approach the material strip and cut it. The fourth drive member 209 can drive the pressure roller assembly 207 to move relative to the second support 201 to approach the material strip and press the material strip tightly and securely.

[0074] In the third direction, the tab bending assembly 100 and the pressure roller assembly 207 are respectively located on both sides of the cutter assembly 206, so that the pressure roller assembly 207 can press and fix the material strip, and the cutter assembly 206 can cut the pressed material strip.

[0075] According to a third aspect of an embodiment of the present application, a battery cell winding apparatus is provided, comprising a turret and the aforementioned tab bending apparatus 200. A winding needle 300 is mounted on the turret, and is used to wind a material strip (including a pole piece and a separator) into a battery cell 400. The turret can be rotated so that the winding needle 300 is positioned at a winding station, a finishing and gluing station, or a blanking station. The tab bending assembly 100 of the tab bending apparatus 200 is capable of bending the tab 401.

[0076] Specifically, the battery cell winding equipment operates as follows: the positive electrode sheet, negative electrode sheet, and separator are transported via the material strip loading mechanism to the winding needle 300 located at the winding station, where they are clamped. In the first direction, the first drive member 202 drives the second support 201 toward the winding needle 300, while the second drive member 205 drives the third support toward the winding needle 300. Driven by the connecting rod 101, the roller 102 and the air blow pipe 103 synchronously approach the winding needle 300. The winding needle 300 rotates to wind the battery cell 400. Before the roller 102 contacts the tab 401, the air blow pipe 103 bends the tab 401 toward the axis L of the battery cell 400. Therefore, if a tab 401 is turned outward, it will be blown inward by the air blow pipe 103, and then the roller 102 bends the tab 401 on the battery cell 400. During the winding process of the battery cell 400, the diameter of the battery cell 400 gradually increases. The first drive member 202 can drive the second support 201 to gradually move away from the axis L of the battery cell 400 to accommodate the gradually increasing diameter of the tab 401. When winding is completed, the first drive member 202 drives the second support 201 to move away from the winding needle 300, so that the tab bending assembly 100 exits the winding station. By rotating the turret, the battery cell 400 that has been wound at the winding station reaches the finishing and gluing station. At this time, a section of the strip will exist between the finishing and gluing station and the winding station. The fourth drive member drives the pressure roller assembly 207 to move in the first direction to compress this section of the strip, and then the third drive member 208 drives the cutter assembly 206 to move in the first direction to cut the strip. After cutting is completed, the winding needle 300 located at the finishing and gluing station rotates to complete the winding, and the empty winding needle 300 located at the winding station continues to repeat the above-mentioned winding process. The battery cell 400 that has completed the final gluing arrives at the unloading station as the turret rotates, and the completed battery cell 400 is unloaded.

[0077] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A tab bending assembly (100), characterized in that: include: A connecting rod (101), wherein the connecting rod (101) is provided with a rotatable roller (102), and the roller (102) is used to bend the tab (401) of the battery cell (400); An air blowing pipe (103) is installed on the connecting rod (101), and the air blowing pipe (103) is used to blow the tab (401) toward the axis of the battery core (400) to bend it.

2. The tab bending assembly (100) according to claim 1, characterized in that: In the conveying direction of the pole piece, the blowing port (1031) of the blowing pipe (103) is located upstream of the roller (102).

3. The tab bending assembly (100) according to claim 1, characterized in that: The roller (102) has a rolling surface (105), the rolling surface (105) is used to abut against the tab (401), the rolling surface (105) has an edge line (114), and the projection of the edge line (114) along the first direction at least partially falls into the blowing port (1031) of the blowing pipe (103).

4. The tab bending assembly according to claim 1, characterized in that: The air blowing pipe (103) is mounted on the connecting rod (101) via an air pipe fixing clamp (104).

5. The tab bending assembly according to claim 1, characterized in that: The connecting rod (101) is fixed to the connecting rod locking block (107), and the connecting rod locking block (107) is slidably connected to the first support (108) through a first guide rod (109). A first elastic member (110) is provided between the connecting rod locking block (107) and the first support (108), and the first elastic member (110) provides a pre-tightening force to enable the roller (102) to generate a movement trend along the first direction close to the pole ear (401).

6. The tab bending assembly according to claim 5, characterized in that: Also includes: a fixed block (111), wherein the first support (108) is rotatably connected to the fixed block (111); a second elastic member (113), the second elastic member (113) being arranged between the first support (108) and the fixed block (111), the second elastic member (113) providing a pre-tightening force to cause the roller (102) to generate a movement trend toward the tab (401) along a second direction; The first direction intersects the second direction.

7. A tab bending device (200), characterized in that: include: At least two tab bending assemblies (100) according to any one of claims 1 to 6; a second support (201), the tab bending assembly (100) being connected to the second support (201); A first driving member (202) is connected to the second support (201), and the first driving member (202) is capable of driving the second support (201) to move closer to or away from the axis of the battery cell (400).

8. The tab bending device according to claim 7, characterized in that: It also includes a third support (203), the third support (203) being slidably connected to the second support (201) via a second guide rod (204), and at least two tab bending assemblies (100) being mounted on the third support (203); The second support (201) is equipped with a second driving member (205), and the second driving member (205) can drive the third support (203) to move the roller (102) toward or away from the axis of the battery cell (400).

9. The tab bending device according to claim 8, characterized in that: The fixing block (111) of the tab bending assembly (100) is provided with a waist-shaped hole (1111), the axis of which extends along the distance direction between the two tab bending assemblies (100), and the third support (203) is provided with a plurality of locking holes (2031). The locking member is inserted into the waist-shaped hole (1111) and the locking hole (2031) and then locked. The fixing block (111) can adjust the distance between the two tab bending assemblies (100) through the waist-shaped hole (1111) and the locking hole (2031).

10. The tab bending device according to claim 7, characterized in that: The tab bending device (200) further includes a cutter assembly (206), a pressure roller assembly (207), a third drive member (208) and a fourth drive member (209); the cutter assembly (206) is in sliding cooperation with the second support (201); the pressure roller assembly (207) is in sliding cooperation with the second support (201); the third drive member (208) is mounted on the second support (201); the fourth drive member (209) is mounted on the second support (201); the third drive member (208) is used to drive the cutter assembly (206) to move; the fourth drive member (209) is used to drive the pressure roller assembly (207) to move; the cutter assembly (206) is located between the tab bending assembly (100) and the pressure roller assembly (207).

11. A battery core winding device, characterized in that: include: A turret, wherein a winding needle (300) is installed on the turret, and the winding needle (300) is used to wind the material strip into a battery core (400); According to the tab bending device (200) according to any one of claims 7 to 10, the tab bending assembly (100) of the tab bending device (200) is capable of bending the tab (401).

Images