Tool structure for rubberizing lithium ion battery

Abstract

The utility model aims to provide a tool structure for rubberizing a lithium ion battery. The tool structure comprises a connecting bracket, a pneumatic telescopic device, an adhesive tape, a connector II and a connector I, wherein the connector II and the connector I are respectively connected with the connecting bracket and the pneumatic telescopic device. The first connector and the second connector are each provided with a negative pressure hole, and the negative pressure holes are used for adsorbing the adhesive tape. The negative pressure hole is additionally formed in the second connector, so that the action area of suction force can be increased, and the suction force of each position point can be reduced on the premise that effective suction of the adhesive tape is guaranteed. Therefore, the damage to the tab caused by pulling the adhesive tape by negative pressure suction force is reduced. According to the rubberizing tool structure for the lithium ion battery, on the basis that rubberizing is carried out at the joint of the top end of the roll core and the tab, and the rubberizing position and the rubberizing force are accurately controlled, the tab can be prevented from being deformed by negative pressure tension, and further damage to a battery core structure in the subsequent core combining process is prevented.

Description

Technical Field

[0001] The utility model relates to the field of glue sticking tooling, and more specifically, to the field of a glue sticking tooling structure for the top end of a lithium battery coil core. Background Art

[0002] Lithium battery is a rechargeable battery that uses lithium metal or lithium ions as the positive electrode material of the battery. The battery cell is the core component of the lithium battery, mainly composed of positive and negative electrodes, separators, electrolytes and cores. The core is the winding structure inside the battery cell, which is used to support and fix the positive and negative electrodes, separators and electrolyte components of the battery cell. Stacking multiple positive electrodes, negative electrodes, separator layers and cores together to improve the energy density and output performance of the battery cell by winding or stacking is called a core.

[0003] Patent number CN 215119165 U discloses a lithium battery cell structure, in which the electrode sheets of the positive and negative electrodes extend out to form a part called a pole ear. A connecting piece is ultrasonically welded in the pole ear between the two winding cores. Multiple winding cores are connected by pole ears and connecting pieces to improve the energy density and output performance of the battery cell. The design and manufacturing quality of the pole ears will directly affect the performance and safety of the battery. They need to have good conductivity and stable connection performance to ensure that the battery can stably transmit electrical energy during use.

[0004] In order to prevent the tabs from loosening due to vibration during use, and to prevent the tabs inside the battery from contacting other components and causing internal short circuits in the battery, it is usually necessary to stick high-temperature resistant tape at the connection between the top of the winding core and the tabs. Figure 1 As shown, it includes a connecting bracket, a pneumatic telescopic device, and a connector 1 and a connector 2 connected to the connecting bracket and the pneumatic telescopic device respectively. The connector 1 is provided with a negative pressure hole for adsorbing the tape. The connecting bracket and the pneumatic telescopic device are moved so that the tape is bonded to the intersection of the winding core, the pole ear and the connecting piece. After the connection is completed, when the pneumatic telescopic device is retracted, the negative pressure hole on the connector 1 causes a pulling force to be applied to the tape at that position, which easily causes the pole ear at the corresponding position to be deformed by the force, affecting the performance of the battery cell. In addition, during the core bonding process, the pole ear is easily torn by the bonded tape after deformation, thereby causing further damage to the battery cell structure. If the negative pressure system is turned off after the pasting is completed, the negative pressure system will be frequently switched on and off, which will consume more additional energy. In addition, it takes a long time to stabilize the negative pressure system at the set negative pressure value. Frequent switching will affect the performance stability of the negative pressure system and will also accelerate the loss of equipment. Utility Model Content

[0005] The utility model aims to provide a tooling structure for gluing lithium-ion batteries, which can not only glue the top of the winding core and the connection between the pole ear and realize precise control of the gluing position and the gluing force, but also prevent the pole ear from being deformed by negative pressure tension and prevent further damage to the battery cell structure during the subsequent core assembly process.

[0006] The utility model is realized through the following technical solutions:

[0007] A tooling structure for gluing lithium-ion batteries, comprising a connecting bracket, a pneumatic telescopic device, a tape, and a second connector and a first connector respectively connected to the connecting bracket and the pneumatic telescopic device, characterized in that both the first connector and the second connector are provided with negative pressure holes for adsorbing the tape.

[0008] The negative pressure hole for adsorbing the tape is provided on both the connector 1 and the connector 2. Adding the negative pressure hole on the connector 2 can increase the effective area of ​​the suction force, and can reduce the suction force at each position point while ensuring the effective adsorption of the tape. This reduces the damage to the tab caused by the negative pressure suction pulling the tape.

[0009] In addition, after the tape is bonded, since the top of the winding core and the pole ear connected thereto are both subject to suction caused by negative pressure, compared with the design in which a single position point acts on the pole ear, adding a position point of action at the top of the winding core can achieve force balance and avoid deformation of the pole ear due to unbalanced force.

[0010] This type of gluing tooling structure for lithium-ion batteries can not only perform gluing at the connection between the top of the winding core and the pole ear and realize precise control of the gluing position and gluing force, but also prevent the pole ear from being deformed by negative pressure tension and prevent further damage to the battery cell structure during the subsequent core assembly process.

[0011] As a preferred embodiment of the present invention, the negative pressure holes are provided in plurality and are evenly distributed on the first connector and the second connector.

[0012] A plurality of small negative pressure holes are evenly arranged on the connector 1 and the connector 2, which can produce a more uniform negative pressure effect and prevent the pole ear from being deformed due to uneven force and affecting the performance of the battery cell. Compared with large-diameter negative pressure holes, small negative pressure holes are more conducive to removing impurities in the air and preventing larger particles of impurities from entering the negative pressure system through the negative pressure holes and affecting the normal operation of the device. This design can also increase the stability of the system. Even if one of the negative pressure holes has a problem, the entire system can still operate normally. Therefore, compared with a large negative pressure hole, multiple small negative pressure holes can usually provide better effects and more flexible control in a negative pressure system.

[0013] As a preferred embodiment of the present invention, arc corners are provided on the connector 1 for protecting the adhesive tape from being scratched.

[0014] The edge line of the contact surface between the adhesive tape and the connector 1 is provided with a rounded corner, which can reduce the sharpness of the corners or edges of the workpiece, thereby preventing the adhesive tape from being cut by the sharp edge part during the advancement of the pneumatic telescopic device, thereby affecting the adhesive bonding. In addition, it can also prevent the surface of the battery cell from being scratched by the sharp edge part of the connector 1, thereby improving the product yield.

[0015] As a preferred embodiment of the present invention, a moving device is connected to the connecting bracket, and the moving device includes a T-shaped screw rod and a nut. The nut is connected to the connecting bracket, and the connecting bracket is driven to move linearly by rotating the T-shaped screw rod and cooperating with the nut.

[0016] The T-shaped screw is a mechanical transmission element with a T-shaped cross-section, and is often used to convert rotational motion into linear motion. The T-shaped screw is usually used in conjunction with the nut to form a moving device. When the T-shaped screw rotates, the nut moves along the thread of the T-shaped screw, thereby achieving linear forward and backward movement of the nut. The connecting bracket 1 is connected to the nut to drive the linear forward and backward movement of the connecting bracket 1, thereby achieving approach and distance to the winding core.

[0017] This type of mobile device can achieve higher linear positioning accuracy by controlling the rotation angle, and is suitable for applications that require precise position control. In addition, the transmission assembly composed of the T-screw and the nut can withstand larger radial and axial loads, and because the contact area between the T-screw and the nut is large, it has a longer service life and a lower wear rate. While ensuring the consistency of the movement direction of the connecting bracket each time, the service life of the device can be extended while ensuring that the system can work normally. At the same time, the structural design of the T-screw and the nut makes the transmission assembly have a self-locking feature, which can prevent the influence of external forces from causing position deviation and increase the stability of the device structure.

[0018] As a preferred embodiment of the present invention, the moving device further includes a stepping motor connected to the T-shaped lead screw and driving the T-shaped lead screw to rotate.

[0019] Inaccurate control of the moving path of the connecting bracket may result in damage to the connecting head 2 and the winding core or failure of the adhesive tape to effectively bond to the desired bonding surface. The stepper motor is an electric motor that can accurately control the rotation angle and can accurately control the rotation angle of the T-shaped screw rod. The combination of the stepper motor, the T-shaped screw rod and the nut can achieve accurate positioning of the connecting bracket, thereby ensuring effective bonding of the adhesive tape and extending the service life of the device.

[0020] As a preferred embodiment of the utility model, the pneumatic telescopic device includes a fixed part, a cylinder and a piston rod located inside the fixed part, one end of the piston rod is connected to the connecting head 1, a positioning block is provided on the piston rod, and the fixed part is provided with a limiting groove for the positioning block to move and limit the action thread of the connecting head 1.

[0021] The cylinder drives the piston rod to perform linear reciprocating motion, thereby driving the connector 1 connected to one end of the piston rod to perform linear reciprocating motion. The piston rod is provided with a positioning block, which cooperates with the limiting groove on the fixing part to limit the moving distance of the connector 1, thereby preventing the connector 1 from being pushed by the cylinder to impact the pole ear, thereby causing the pole ear and the connecting sheet to bend, affecting the performance of the battery cell.

[0022] As a preferred embodiment of the present invention, the length range of the limiting groove is between 45% and 50% of the thickness of the winding core.

[0023] The thickness of the tab is negligible compared to the thickness of the entire core. The length range of the limit groove is set between 45% and 50% of the core thickness, thereby limiting the maximum movable range of the connector 1 to slightly less than half the core thickness, thereby further preventing the connector 1 from being pushed by the cylinder to impact the tab, thereby causing the tab and the connecting piece to bend, affecting the performance of the battery cell, and at the same time, ensuring that the tape can be effectively bonded to the bonding surface.

[0024] The utility model has the following beneficial effects:

[0025] 1. Adding the negative pressure hole on the second connector can increase the effective area of ​​suction. Under the premise of ensuring effective adsorption of the tape, the suction force at each position point can be reduced, thereby reducing the damage to the tab caused by the negative pressure suction pulling the tape.

[0026] 2. A plurality of small negative pressure holes are evenly arranged on the connector 1 and the connector 2, which can produce a more uniform negative pressure effect and prevent the tabs from being deformed due to uneven force, thereby affecting the performance of the battery cell.

[0027] 3. A rounded corner is provided at the edge line of the contact surface between the adhesive tape and the connector 1, which can reduce the sharpness of the corners or edges of the workpiece, thereby preventing the adhesive tape from being cut by the sharp edge part during the advancement of the pneumatic telescopic device.

[0028] 4. The moving device can achieve higher linear positioning accuracy by controlling the rotation angle, thereby realizing precise control of the moving position of the second connector.

[0029] 5. The structural design of the T-shaped screw rod and nut makes the transmission assembly have a self-locking feature, which can prevent the position from being offset due to the influence of external forces and increase the stability of the device structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the existing glue sticking tooling;

[0031] Figure 2 It is a schematic diagram of the improved tooling structure;

[0032] Figure 3 Schematic diagram of the negative pressure hole distribution position;

[0033] Figure 4 is a schematic diagram of the structure of the mobile device;

[0034] Figure 5 It is a schematic diagram of the structure of a pneumatic telescopic device.

[0035] In the figure: 1', existing connecting bracket, 2', existing pneumatic telescopic device, 31', existing connecting head 1, 32', existing connecting head 2, 1, connecting bracket, 2, pneumatic telescopic device, 21, fixing part, 22, piston rod, 23, positioning block, 24, limiting groove, 31, connecting head 1, 32, connecting head 2, 4, negative pressure hole, 5, battery cell, 51, winding core, 52, pole ear, 53, connecting piece, 6, tape, 7, moving device, 71, T-shaped screw rod, 72, nut, 73, stepping motor. DETAILED DESCRIPTION

[0036] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0037] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0038] like Figure 1 As shown, the existing glue sticking tooling includes an existing connection bracket 1', an existing pneumatic telescopic device 2', and an existing connector 1 31' and an existing connector 2 32' respectively connected to the existing connection bracket 1' and the existing pneumatic telescopic device 2'. The existing connection bracket 1' and the pneumatic telescopic device 2' allow the tape to be bonded to the interface between the winding core, the pole ear and the connecting piece. After the bonding is completed, when the existing pneumatic telescopic device 2' is retracted, the negative pressure hole on the connector 1 causes a pulling force to be applied to the tape at that position, which can easily cause the pole ear at the corresponding position to be deformed by the force, thus affecting the performance of the battery cell. Moreover, during the core assembly process, the pole ear is easily torn by the bonding tape after being deformed, thereby causing further damage to the battery cell structure.

[0039] The improved glue sticking tooling is as follows Figure 2 , 4 As shown, the rotation angle of the T-shaped screw rod 71 is precisely controlled by the stepper motor 73, thereby precisely controlling the nut 72 on the T-shaped screw rod 71 to make linear movements up and down. The nut 72 is connected to one end of the connecting bracket 1. Figure 3 As shown, multiple and evenly distributed negative pressure holes 4 are provided on the connector 1 31 and the connector 2 32, and the negative pressure holes 4 are used to adsorb the tape 6. Adding negative pressure holes 4 on the connector 2 32 can increase the effective area of ​​suction, and can reduce the suction force at each position point while ensuring effective adsorption of the tape 6. Thus, the damage to the tab 52 caused by the negative pressure suction pulling the tape 6 is reduced.

[0040] The stepper motor 73 on the moving device 7 drives the connecting bracket 1, the connecting head 1 31, the connecting head 2 32 and the adhesive tape 6 to move linearly up and down, so that part of the adhesive tape 6 can be effectively bonded to the surface of the winding core 51. Figure 5 As shown, the cylinder (not shown) drives the piston rod to make linear motion, thereby driving the connector 31 connected to one end of the piston rod to move closer to the pole ear 52. The piston rod is provided with a positioning block 23, which cooperates with the limiting groove 24 on the fixing part 21, limiting the maximum movable range of the connector 31 to slightly less than half the thickness of the winding core 51, thereby further preventing the connector 31 from being pushed by the cylinder to impact the pole ear 52, thereby causing the pole ear 52 and the connecting piece 53 to bend, affecting the performance of the battery cell 5, and at the same time, it can also ensure that the tape 6 can be effectively bonded to the bonding surface.

[0041] A negative pressure system with greater power than that at connector one 31 can be selected at connector two 32, so that the negative pressure suction at connector two 32 is greater than the negative pressure suction on connector one 31. With such a design structure, when the operator controls the pneumatic telescopic device 2 to advance downward, part of the tape 6 at connector one 31 will not separate from connector two 32 due to being adsorbed by the greater suction force. The smoothness of the glue sticking action is ensured, which helps to improve the operating stability of the glue sticking tooling structure for lithium-ion batteries. In addition, the winding core 51 has a stronger bending resistance than the pole ear 52 and the connecting piece 53. Under the premise of ensuring that the tape 6 can be adsorbed, more suction is shared at connector two 32, which can reduce the suction of connector one 31 accordingly, thereby avoiding deformation and damage to the pole ear 52 by the negative pressure suction when the glue sticking action is completed.

[0042] The edge line of the contact surface between the adhesive tape 6 and the connector 31 is provided with a rounded corner, which can reduce the sharpness of the corners or edges of the workpiece, thereby preventing the adhesive tape 6 from being cut by the sharp edge portion during the advancement of the pneumatic telescopic device 2, thereby affecting the adhesive bonding. In addition, it can also prevent the surface of the battery cell 5 from being scratched by the sharp edge portion of the connector 31, thereby improving the product yield.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tooling structure for gluing lithium-ion batteries, comprising a connecting bracket (1), a pneumatic telescopic device (2), an adhesive tape (6), and a second connecting head (32) and a first connecting head (31) respectively connected to the connecting bracket (1) and the pneumatic telescopic device (2), characterized in that: Negative pressure holes (4) are provided on the connector 1 (31) and the connector 2 32 for adsorbing the adhesive tape (6).

2. The gluing tooling structure for lithium-ion batteries according to claim 1, characterized in that: The negative pressure holes (4) are provided in plurality and are evenly distributed on the first connector (31) and the second connector (32).

3. The gluing tooling structure for lithium-ion batteries according to claim 1, characterized in that: The connector 1 (31) is provided with arc corners for protecting the adhesive tape (6) from being scratched.

4. The gluing tooling structure for lithium-ion batteries according to claim 1, characterized in that: The connecting bracket (1) is connected to a moving device (7), the moving device (7) comprising a T-shaped screw rod (71) and a nut (72), the nut (72) being connected to the connecting bracket (1), and the connecting bracket (1) is driven to move linearly by rotating the T-shaped screw rod (71) and cooperating with the nut (72).

5. The gluing tooling structure for lithium-ion batteries according to claim 4, characterized in that: The moving device (7) further comprises a stepping motor (73) connected to the T-shaped lead screw (71) and driving the T-shaped lead screw (71) to rotate.

6. A tooling structure for gluing lithium-ion batteries according to any one of claims 1 to 5, characterized in that: The pneumatic telescopic device (2) comprises a fixed part (21), a cylinder and a piston rod (22) located inside the fixed part (21), one end of the piston rod (22) being connected to the first connector (31), a positioning block (23) being provided on the piston rod (22), and a limiting groove (24) being provided on the fixed part (21) for the positioning block (23) to move and for limiting the action thread of the first connector (31).

7. The gluing tooling structure for lithium-ion batteries according to claim 6, characterized in that: The length of the limiting groove (24) is in the range of 45% to 50% of the thickness of the winding core.

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