Tool setting device and lithium ion battery diaphragm splitting machine with tool setting device

Abstract

The invention discloses a tool setting device which comprises an adjusting mechanism, the adjusting mechanism is connected with a plurality of upper tool blades, a lower tool shaft is arranged on one side of the adjusting mechanism, a plurality of grooves are formed in the lower tool shaft, lower tool blades are arranged in the grooves, and the adjusting mechanism is used for adjusting the positions and the rotating directions of the upper tool blades. And the upper cutter blade and the lower cutter blade can form a shearing area in the groove. According to the tool setting device, the driving assembly in the tool setting device can be matched with a control system, automatic tool setting of the lithium ion battery diaphragm splitting machine is achieved, manual intervention is reduced, operation simplicity and production efficiency are improved, the tool setting error rate and diaphragm cutting size deviation can be reduced, and the performance and quality of a battery assembled subsequently are improved; the positioning mechanism can ensure the stability of the diaphragm in the tool setting and slitting process, and displacement of the diaphragm is avoided; the upper cutter blade can be accurately adjusted through the driving assembly, and an instruction of a control system can be responded in time.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion battery manufacturing, and in particular to a knife setting device and a lithium ion battery diaphragm slitting machine using the same. Background Art

[0002] As an efficient, lightweight and rechargeable energy storage device, lithium-ion batteries have been widely used in many fields, from portable electronic devices such as mobile phones and laptops to large energy systems such as electric vehicles and energy storage power stations. Lithium-ion batteries play a vital role. As a key inner component of lithium-ion batteries, the performance and quality of lithium-ion battery separators directly affect the safety, cycle life and energy density of batteries. The main function of lithium-ion battery separators is to separate the positive and negative electrodes of the battery to prevent short circuits between the two electrodes.

[0003] In the production process of lithium-ion battery separators, wide separators need to be cut into finished products of different widths and lengths as needed. When adjusting the knife setting device in the existing slitting machine, the operation is complicated and the precision requirements are high, which requires the operator to have high skills and experience. Inexperienced workers are prone to slow knife setting or knife setting errors. This not only affects production efficiency and increases production costs, but also easily leads to separator size deviation, affecting battery performance and quality. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of the above-mentioned background technology and to provide a knife setting device and a lithium-ion battery diaphragm slitting machine using the same.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A knife setting device comprises: an adjustment mechanism, wherein the adjustment mechanism is connected to a plurality of upper knife blades, a lower knife shaft is arranged on one side of the adjustment mechanism, the lower knife shaft is provided with a plurality of grooves, and the lower knife blades are arranged in the grooves, and the adjustment mechanism is used to adjust the position and direction of the upper knife blades so that the upper knife blades and the lower knife blades can form a shearing area in the grooves.

[0007] As a further solution of the present invention: the adjustment mechanism includes a plurality of drive components, the drive components are connected to the upper knife blade, the drive components are used to drive the upper knife blade to rotate, and the drive components include a servo motor and a ball screw.

[0008] As a further solution of the present invention: the adjusting mechanism comprises a second cylinder, the telescopic end of the second cylinder is connected to the upper knife shaft, the upper knife shaft is connected to the driving assembly as a linear guide structure, and the driving assembly cooperates with the upper knife shaft to adjust the distance between two adjacent upper knife blades.

[0009] As a further solution of the present invention: the driving assembly is connected to a sensor, and the sensor is used to detect the distance between the upper knife blade and the diaphragm.

[0010] A lithium-ion battery diaphragm slitting machine comprises: a frame, the frame is connected to a knife setting device, a control system, the control system is used to analyze and calculate the signal received from the sensor, generate a calculation result, and adjust the movement of an upper knife blade based on the calculation result, the control system comprises an interface circuit unit, the interface circuit unit is connected to the knife setting device, the interface circuit unit is connected to a data acquisition unit, the data acquisition unit is used to collect the signal sent by the sensor, the data acquisition unit is connected to a data processing unit, the data processing unit calculates the displacement of the upper knife blade through an algorithm, the interface circuit unit is connected to a motion control unit, and the motion control unit is connected to an adjustment mechanism through the interface circuit unit.

[0011] As a further solution of the present invention: the frame is connected to a positioning mechanism, and the positioning mechanism is used to fix the unwinding position of the diaphragm.

[0012] As a further solution of the present invention: the positioning mechanism includes a fixing frame, the fixing frame is connected to the first cylinder, the telescopic end of the first cylinder is connected to a clamping block, and the clamping block is used to clamp the diaphragm roller.

[0013] As a further solution of the present invention: the frame is connected to the guide roller.

[0014] Beneficial effects of the present invention:

[0015] (1) In the present invention, the driving assembly in the tool setting device can cooperate with the control system to realize automatic tool setting of the lithium-ion battery diaphragm slitting machine, reduce manual intervention, improve operational simplicity and production efficiency, and also reduce the tool setting error rate and dimensional deviation of diaphragm cutting, thereby improving the performance and quality of the subsequently assembled batteries.

[0016] (2) In the present invention, the positioning mechanism can ensure the stability of the diaphragm during the knife alignment and slitting process and prevent the diaphragm from being displaced.

[0017] (3) In the present invention, the upper blade can be precisely adjusted through the drive assembly, and the instructions of the control system can be responded to in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a structural schematic diagram of a lithium-ion battery separator slitting machine of the present invention;

[0020] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 It is a structural schematic diagram of a control system in a lithium-ion battery diaphragm slitting machine of the present invention;

[0022] Figure 4 The present invention is a structural schematic diagram of a lithium-ion battery separator slitting machine in use.

[0023] In the figure: 1. frame; 2. positioning mechanism; 21. fixing frame; 22. first cylinder; 23. clamping block; 3. guide roller; 4. adjusting mechanism; 41. second cylinder; 42. upper knife shaft; 5. upper knife blade; 6. lower knife shaft; 7. lower knife blade; 8. sensor. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 2 As shown, the present invention is a tool setting device, comprising: an upper blade 5 and a lower blade 7. After the upper blade 5 and the lower blade 7 are set, they rotate relative to each other so that the edges of the blades can contact each other to form a shear force. The contact point between the upper blade 5 and the lower blade 7 is the shear force action area. The blades will generate cutting force at the contact point, thereby causing the diaphragm between the upper blade 5 and the lower blade 7 to be sheared.

[0026] The knife setting device includes an adjusting mechanism 4, and the adjusting mechanism 4 includes a plurality of driving components, and the driving components are connected to the upper knife blade 5 and are used to drive the upper knife blade 5 to rotate.

[0027] Specifically, the driving assembly includes a servo motor and a ball screw. The ball screw is a mechanical element that converts rotational motion into linear motion and has the characteristics of high efficiency and low friction. In this embodiment, a coupling is used to connect the output shaft of the servo motor to the nut of the ball screw. When the servo motor rotates, the ball screw is rotated through the coupling. The upper blade 5 can be installed on the slider of the ball screw, and the slider moves linearly under the movement of the screw.

[0028] Furthermore, the drive assembly is also connected to a sensor 8, which uses a laser displacement sensor to detect the position of the upper blade 5 in real time and accurately, thereby obtaining the distance between the upper blade 5 and the diaphragm, thereby improving the accuracy of the knife setting. Specifically, the adjustment mechanism 4 also includes a second cylinder 41, the telescopic end of the second cylinder 41 is connected to the upper blade shaft 42, and the upper blade shaft 42 is connected to the drive assembly as a straight guide structure, so that the upper blade 5 can move along the axial direction of the upper blade shaft 42 when moving in a straight line, thereby realizing the cooperation between the drive assembly and the upper blade shaft 42 to adjust the distance between two adjacent upper blades 5.

[0029] In this embodiment, the second cylinder 41 can drive the upper blade shaft 42 to move horizontally, thereby driving the upper blade 5 to move closer to or away from the lower blade 7 .

[0030] In addition, a lower knife shaft 6 is also arranged on one side of the adjustment mechanism 4, and a plurality of grooves are provided on the lower knife shaft 6, and a lower knife blade 7 is arranged in the groove. The lower knife blade 7 is connected to a servo motor, and the servo motor can drive the lower knife blade 7 to rotate, and the outer diameter of the lower knife blade 7 is equal to the outer diameter of the lower knife shaft 6, so that the diaphragm can be cut on the surface of the lower knife shaft 6.

[0031] In this embodiment, the adjustment mechanism 4 can first adjust the position and direction of the upper blade 5 through the driving component, so that the upper blade 5 and the lower blade 7 can form a shearing area in the groove. When the diaphragm passes through the surface of the lower blade shaft 6, the upper blade 5 and the lower blade 7 rotate in opposite directions in the shearing area, thereby cutting the diaphragm into the desired width.

[0032] See also Figure 1-Figure 3 As shown, a lithium-ion battery separator slitting machine comprises: a frame 1, and the frame 1 is connected to a knife setting device.

[0033] The frame 1 is connected to the positioning mechanism 2, which is used to fix the unwinding position of the diaphragm. The positioning mechanism 2 includes a fixed frame 21, which is fixedly installed on the frame 1, and the fixed frame 21 is connected to the first cylinder 22. The telescopic end of the first cylinder 22 is connected to the clamp 23, and the clamp 23 can clamp the diaphragm roll as a clamp. Specifically, the diaphragm roll is placed on the fixed frame 21, and the first cylinder 22 drives the clamp 23 to move, and the clamp 23 pushes the diaphragm roll to one side until one end of the diaphragm roll is pressed against the fixed frame 21. In some other embodiments, a first cylinder 22 can also be set at each end of the diaphragm roll, and accordingly, each first cylinder 22 is connected to a clamp 23, and then the diaphragm roll is firmly clamped from both sides to ensure that the diaphragm does not move during the knife alignment and slitting process. The frame 1 is also connected to the guide roller 3, which is located below the upper knife shaft 42 and the lower knife shaft 6, and is used to guide the diaphragm on the diaphragm roll.

[0034] See also Figure 3As shown, a lithium-ion battery diaphragm slitting machine is also provided with a control system, which is used to analyze and calculate the signal received from the sensor 8, generate a calculation result, and adjust the movement of the upper knife blade 5 based on the calculation result.

[0035] Specifically, the control system includes an interface circuit unit, which is connected to the tool setting device. The interface circuit unit is provided with a plurality of expansion interfaces to facilitate integration of the tool setting device into the control system.

[0036] Furthermore, the interface circuit unit is connected to the data acquisition unit, and the data acquisition unit is used to collect the signal sent by the sensor 8. The interface circuit unit is electrically connected to the sensor 8 through the expansion interface, so that the sensor 8 converts the detected position data of the upper blade 5 into an electrical signal and transmits it to the data acquisition unit, and the data acquisition unit converts the format of the received electrical signal to generate a digital signal.

[0037] The data acquisition unit is connected to the data processing unit, and the data processing unit calculates the displacement of the upper blade 5 through an algorithm. There are usually two types of displacement algorithms, one is absolute displacement calculation, and the other is relative displacement calculation. Absolute displacement calculation: If the sensor 8 adopts an absolute position sensor, the current position information of the upper blade 5 can be directly read. Relative displacement calculation: If the sensor 8 adopts a relative position sensor (such as an incremental encoder), it is necessary to record the last position and calculate the displacement by subtracting the last position from the current position. In this embodiment, the laser displacement sensor used by the sensor 8 is an absolute position sensor. In addition, the data processing unit will also process the data detected by the sensor 8 through a filtering algorithm (such as a Kalman filter, a low-pass filter) to obtain smoother and more accurate displacement data.

[0038] The data processing unit is connected to the motion control unit, the interface circuit unit is connected to the motion control unit, and the interface circuit unit is electrically connected to the regulating mechanism 4 via the expansion interface, so that the motion control unit can be connected to the regulating mechanism 4 via the interface circuit unit.

[0039] Specifically, after the data processing unit calculates the displacement of the upper blade 5, it transmits the data signal of the displacement to the motion control unit. After receiving the data signal of the displacement, the motion control unit performs error calculation and uses the PID algorithm to calculate the control output to adjust the servo motor drive signal in the drive component. That is, the proportional-integral-differential (PID) control algorithm is used to control the movement of the upper blade 5. PID can automatically adjust the output of the servo motor in the drive component and the output of the second cylinder 41 according to the difference (error) between the set target position (or displacement) and the current position of the upper blade 5, so that the upper blade 5 moves to the target position.

[0040] Error calculation:

[0041] Error = target position - current position information

[0042] Control output:

[0043] Control output = K P Error + K i ∫ Error dt+K d d(error) / dt

[0044] Among them, K P , K i , K d They are the proportional, integral and derivative gains of the PID controller respectively.

[0045] In addition, the control system is also equipped with a human-computer interaction interface to facilitate operators to set parameters and monitor the tool setting process.

[0046] The inventors found that in the complex operation of lithium-ion battery diaphragm slitting machines, the adjustment of the knife-setting device requires the operator to have high skills and experience, and human errors are prone to occur during the operation. The slow speed of manual knife setting will increase the equipment downtime on the production line, reduce the utilization rate of the equipment, and thus affect the efficiency of the entire production process. In addition, due to inaccurate knife setting, the diaphragm will have uneven edges and excessive burrs. These problems are likely to cause electrode short circuits and electrolyte leakage during the battery assembly process. If the positive and negative poles of the battery are short-circuited, the battery will quickly heat up, catch fire or even explode, posing a huge safety hazard to the user, thereby affecting the safety and service life of the battery.

[0047] It can be understood that the drive assembly in the tool setting device can cooperate with the control system to realize automatic tool setting of the lithium-ion battery diaphragm slitting machine, reduce manual intervention, improve operation convenience and production efficiency, and also reduce the tool setting error rate and dimensional deviation of diaphragm cutting, thereby improving the performance and quality of the subsequent assembled batteries.

[0048] See also Figure 1 , Figure 4As shown, when in use, the diaphragm roll is placed on the fixed frame 21, the diaphragm roll is clamped by the positioning mechanism 2, the diaphragm starts to unwind, the sensor 8 detects the distance between the upper knife blade 5 and the diaphragm, the data acquisition unit converts the received signal of the sensor 8 into a digital signal and transmits it to the data processing unit for analysis, the data processing unit calculates the displacement, the motion control unit sends an instruction to the adjustment mechanism 4 after receiving the data signal of the displacement, and the servo motor in the drive assembly moves the upper knife blade 5 laterally after receiving the instruction, so that the distance between two adjacent upper knife blades 5 meets the width requirement of the diaphragm, and the second After receiving the command, the cylinder 41 drives the upper knife shaft 42 to move horizontally, so that the blade of the upper knife blade 5 is embedded in the shearing area in the groove of the lower knife shaft 6. At this time, the knife alignment is completed, and the diaphragm is cut into the required width. During the cutting process, the sensor 8 continues to monitor the position of the upper knife blade 5, and the control system determines whether the distance deviation of the upper knife blade 5 exceeds the threshold. If it exceeds the threshold, the position of the upper knife blade 5 needs to be adjusted, thereby solving the problem of low cutting accuracy caused by manual adjustment of the tool position in the slitting device in the prior art, thereby improving production efficiency and product quality. When the slit diaphragm is rolled up to a preset length by the winding mechanism in the frame 1 (a meter can be equipped to assist in monitoring), the diaphragm is cut off.

[0049] Working principle: When in use, the diaphragm roll is placed on the fixed frame 21, the diaphragm roll is clamped by the positioning mechanism 2, the diaphragm starts to unwind, the sensor 8 detects the distance between the upper knife blade 5 and the diaphragm, the data acquisition unit converts the received signal of the sensor 8 into a digital signal and transmits it to the data processing unit for analysis, the data processing unit calculates the displacement, the motion control unit sends an instruction to the adjustment mechanism 4 after receiving the data signal of the displacement, the servo motor in the drive assembly moves the upper knife blade 5 laterally after receiving the instruction, so that the distance between the two adjacent upper knife blades 5 meets the width requirement of the diaphragm, the second cylinder 41 drives the upper knife shaft 42 to move horizontally after receiving the instruction, so that the blade of the upper knife blade 5 is embedded in the shearing area in the groove of the lower knife shaft 6, at this time the knife alignment is completed, and the diaphragm is cut into the required width, and when the cut diaphragm is rolled up to a preset length by the winding mechanism in the frame 1 (a meter can be provided for auxiliary monitoring), the diaphragm is cut.

[0050] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A tool setting device, characterized in that: include: An adjusting mechanism (4), wherein the adjusting mechanism (4) is connected to a plurality of upper knife blades (5); A lower knife shaft (6) is arranged on one side of the adjustment mechanism (4), the lower knife shaft (6) is provided with a plurality of grooves, and lower knife blades (7) are arranged in the grooves; The adjustment mechanism (4) is used to adjust the position and direction of the upper blade (5) so that the upper blade (5) and the lower blade (7) can form a shearing area in the groove.

2. A tool setting device according to claim 1, characterized in that: The adjusting mechanism (4) comprises a plurality of driving components, wherein the driving components are connected to the upper blade (5), and the driving components are used to drive the upper blade (5) to rotate, and the driving components comprise a servo motor and a ball screw.

3. A tool setting device according to claim 2, characterized in that: The adjustment mechanism (4) comprises a second cylinder (41), the telescopic end of the second cylinder (41) is connected to an upper knife shaft (42), the upper knife shaft (42) is connected to the driving assembly as a linear guide structure, and the driving assembly cooperates with the upper knife shaft (42) to adjust the distance between two adjacent upper knife blades (5).

4. A tool setting device according to claim 2, characterized in that: The driving assembly is connected to a sensor (8), and the sensor (8) is used to detect the distance between the upper knife blade (5) and the diaphragm.

5. A lithium-ion battery separator slitting machine, characterized in that: include: A frame (1), the frame (1) being connected to a tool setting device according to any one of claims 1 to 4; A control system, the control system being used to analyze and calculate the received signal sent by the sensor (8), generate a calculation result, and adjust the movement of the upper blade (5) based on the calculation result; The control system comprises an interface circuit unit, and the interface circuit unit is connected to the tool setting device; The interface circuit unit is connected to a data acquisition unit, and the data acquisition unit is used to collect signals sent by the sensor (8); The data acquisition unit is connected to a data processing unit, and the data processing unit calculates the displacement of the upper blade (5) through an algorithm; The interface circuit unit is connected to the motion control unit, and the motion control unit is connected to the regulating mechanism (4) via the interface circuit unit.

6. The lithium-ion battery separator slitting machine according to claim 5, characterized in that: The frame (1) is connected to a positioning mechanism (2), and the positioning mechanism (2) is used to fix the unwinding position of the diaphragm.

7. The lithium-ion battery separator slitting machine according to claim 6, characterized in that: The positioning mechanism (2) comprises a fixing frame (21), the fixing frame (21) is connected to a first cylinder (22), the telescopic end of the first cylinder (22) is connected to a clamping block (23), and the clamping block (23) is used to clamp the diaphragm roller.

8. The lithium-ion battery separator slitting machine according to claim 5, characterized in that: The frame (1) is connected to the guide roller (3).

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