Method for realizing non-stop sheet insertion in battery cell winding process and battery cell winding equipment

Abstract

The invention relates to a method for realizing non-stop sheet insertion in a cell winding process and cell winding equipment in the field of new energy battery manufacturing, and the method comprises the following steps: 1, setting a reference angle, 2, obtaining a sheet insertion starting angle, 3, calculating a sheet insertion starting absolute angle B, 4, obtaining a sheet insertion ending absolute angle D, and 5, calculating a sheet insertion ending absolute angle D; 6, generating an electronic cam motion curve; and 7, completing non-stop insertion of the battery cell. Through angle parameters and an electronic cam technology, accurate control over the sheet inserting process is achieved, the battery cell winding quality and efficiency are improved, non-stop sheet inserting in the battery cell winding process is achieved, and therefore the production efficiency of lithium batteries is remarkably improved, meanwhile, the battery cell winding continuity and stability are guaranteed, sheet inserting parameters can be flexibly adjusted, and the production efficiency of the lithium batteries is improved. The method is suitable for the winding process of battery cells with different specifications and requirements, the flexibility and applicability of the method are improved, and the method has good universality and practical value.

Description

Technical Field

[0001] The present invention relates to the field of new energy battery manufacturing, and in particular to a method for realizing non-stop cell insertion during a cell winding process and a cell winding device. Background Art

[0002] In the manufacturing process of lithium batteries, the role of automatic winding machines is crucial. Its core function is to accurately wind the battery's pole pieces and separators into battery cells. During the winding process of the battery cell, the insertion of the plug has a decisive influence on the final quality and safety performance of the battery cell.

[0003] Specifically, the winding step requires that the battery cell must be wound uniformly and the end surface must be kept flat. At the same time, the winding length and diameter must also be strictly controlled to ensure that the capacity and size of the battery can meet the established design requirements. If the battery cell is wound tightly, it will not only make it difficult for the electrolyte to penetrate, but it may also cause excessive pressure inside the battery cell, resulting in adverse consequences such as wrinkles or deformation. Therefore, it is particularly important to insert the insert in time during the winding process to adjust the winding tightness of the battery cell.

[0004] The main function of the plug is to adjust the tightness of the battery cell during the winding process, thereby effectively preventing a series of problems caused by tight winding of the battery cell. By inserting the plug in a scientific and reasonable manner and removing the plug after winding is completed, the area where the plug is inserted and removed during the winding process of the battery cell can maintain appropriate tightness, which is conducive to the full penetration of the electrolyte and ensures the uniform distribution of the substances inside the battery cell.

[0005] In the prior art, the battery cell winding equipment usually adopts the process of inserting the tabs after stopping the machine. This process requires that after the battery cell is wound to a certain number of turns, the movement of the winding mechanism is stopped, and then the program controls the tab insertion mechanism to insert the tab into the periphery of the battery cell that has been wound to a certain number of turns, and then the winding mechanism is controlled to continue to complete the subsequent winding action, and after the subsequent winding action is completed, the tab insertion mechanism is controlled to remove the tab. However, this process has obvious problems. First, the insertion of the tab during shutdown will interrupt the continuity of the battery cell winding, resulting in low production efficiency. Secondly, if the timing, position and method of inserting the tab are not properly controlled, the tab will contact the battery cell when it is horizontally inserted into the battery cell, which can easily cause damage to the battery cell and affect the performance and safety of the battery cell.

[0006] At present, the industry urgently needs a method that can achieve accurate insertion without stopping the machine. However, since the insert itself will sag due to its own weight, the battery cell and insert are in a dynamic state during high-speed winding. During high-speed winding, the insert is located at different positions of the battery cell and the spacing between the battery cells is different. Therefore, it is difficult for the insert to accurately align with the best insertion position, which can easily lead to the insert position error during the dynamic insertion process. In severe cases, it may even damage the already wound pole piece. Therefore, how to accurately capture the best time to insert the insert, accurately control the movement trajectory of the insert mechanism, and keep it synchronized with the winding needle mechanism in a high-speed winding and complex and changeable production environment has become a technical problem that needs to be solved urgently. Summary of the invention

[0007] The first purpose of the present invention is to solve the above defects and provide a method for inserting chips without stopping the battery cell winding process, which realizes the non-stop insertion of chips during the battery cell winding process and significantly improves the production efficiency of lithium battery cell winding.

[0008] The first object of the present invention is achieved by the following methods:

[0009] A method for realizing non-stop cell insertion during cell winding, the method comprising the following steps:

[0010] The first step is to set the reference angle. The reference angle is defined as the angle at which the winding needle of the winding needle mechanism rotates. At this time, the reference angle is set to 0°.

[0011] The second step is to obtain the starting angle of inserting the sheet, control the servo motor of the needle winding mechanism, and make the needle of the needle winding mechanism rotate in the normal winding direction. At this time, the sheet inserting mechanism is driven by the needle winding mechanism to rotate synchronously until it is observed that the sheet of the sheet inserting mechanism deviates in the direction away from the needle winding under the action of its own gravity and centrifugal force. Then, the needle winding mechanism is controlled to stop rotating, and the rotation angle A of the needle winding mechanism at this time is obtained. The rotation angle A of the needle winding mechanism is calculated from the reference angle. After taking the remainder of the rotation angle A and 360°, the starting angle a of the sheet inserting mechanism at the beginning of the sheet inserting action is obtained;

[0012] The third step is to set the number of turns of the inserting mechanism to the Nth turn, which is the number of turns of the needle winding mechanism. When the needle winding mechanism drives the inserting mechanism to rotate to the Nth turn, the inserting mechanism starts the inserting action, and the absolute angle B at the start of the insertion is calculated using the formula N*360°+a.

[0013] The fourth step is to obtain the stroke angle C of the inserting mechanism when the inserting mechanism realizes the entire inserting action. The stroke angle C refers to the angle of rotation of the needle winding mechanism during the period from the start of the inserting action to the completion of the inserting action, and the absolute angle D of the end of the inserting action is obtained by using the formula B+C;

[0014] Step 5: Obtain the total stroke L of the inserting mechanism from the start of the inserting action to the completion of the inserting action;

[0015] Step 6: Generate an electronic cam motion curve at the PLC program setting end according to the stroke angle C set in the fourth step and the total stroke L set in the fifth step. The electronic cam motion curve is used to control the inserting piece of the inserting mechanism to realize horizontal inserting motion according to the trajectory of the electronic cam through the program.

[0016] The seventh step, during the cell winding process, when the rotation angle of the winding needle mechanism reaches the absolute angle B for the start of insertion, the program controls the insertion mechanism to drive the insertion piece to be inserted horizontally into the cell being wound by the winding needle according to the electronic cam motion curve generated in the sixth step, until the rotation angle of the winding needle mechanism reaches the absolute angle D for the end of insertion, thus completing the cell insertion without stopping the machine.

[0017] Furthermore, in the first step, when the reference angle is set, the winding needle of the winding needle mechanism and the inserting blade of the inserting blade mechanism are controlled to be perpendicular to the horizontal plane.

[0018] Furthermore, in the second step, the starting insertion angle a obtained by taking the remainder of the rotation angle A and 360° is less than 90°.

[0019] Furthermore, in the fourth step, the stroke angle C is not greater than 180°. Within the stroke angle C, it is necessary to ensure that the insertion action from the beginning to the completion of the insertion action does not interfere with the normal winding action of the battery cell.

[0020] Furthermore, in the third step, the parameter N for starting the insertion action is an integer value preset according to the battery cell specifications and winding requirements.

[0021] Furthermore, when the winding needle of the winding needle mechanism reaches the starting absolute angle B, the winding needle servo motor is used as the main axis and the inserting sheet servo motor is used as the slave axis to couple the electronic cam relationship.

[0022] Furthermore, in the sixth step, a two-dimensional coordinate system is established with the stroke angle C as the maximum value of the horizontal coordinate and the total stroke L as the maximum value of the vertical coordinate. A motion curve from the origin to the end point of the insert is drawn in the established two-dimensional coordinate system as the electronic cam motion curve of the insert mechanism. The angle corresponding to the origin in the motion curve is the starting absolute angle B, and the angle corresponding to the end point is the ending absolute angle D.

[0023] A second object of the present invention is to provide a battery cell winding device for realizing non-stop cell insertion during the battery cell winding process.

[0024] The second object of the present invention is achieved by the following methods:

[0025] The battery cell winding device comprises a winding needle mechanism, a sheet inserting mechanism, a servo motor and a PLC controller, wherein the PLC controller is configured to execute a method for inserting sheets without stopping the battery cell winding process.

[0026] Furthermore, the inserting piece mechanism includes a driving device and an inserting piece, and the driving device is used to drive the inserting piece to move in a horizontal direction.

[0027] Furthermore, it also includes a sensor for detecting the rotation angle of the needle winding mechanism, and the sensor is connected to the PLC controller to transmit the detected rotation angle information to the PLC controller.

[0028] The beneficial effects produced by the present invention are as follows:

[0029] 1) By obtaining the key angle parameters of the inserting mechanism and the winding needle mechanism, the start and end absolute angles of the inserting mechanism are calculated, and the motion control curve of the inserting mechanism is generated by using the electronic cam technology. During the winding process of the battery cell, when the rotation angle of the winding needle reaches the preset value, the inserting mechanism and the winding needle mechanism are controlled to move synchronously to achieve accurate insertion of the inserting mechanism. Since the inserting mechanism will be deviated in the direction away from the winding needle under the action of its own gravity and centrifugal force during the rotation process of the stroke angle C, that is, during this process, the inserting mechanism will deviate in the direction away from the winding needle, ensuring that the inserting mechanism will not interfere with the normal winding action of the battery cell within the total stroke L from the start of the inserting action to the completion of the inserting action, thereby achieving the action process of inserting the inserting mechanism while winding, so as not to damage the battery cell being wound due to the wrong position of the inserting mechanism or improper inserting mechanism;

[0030] 2) The precise control of the insertion process is achieved through angle parameters and electronic cam technology, the quality and efficiency of the battery cell winding are improved, and the non-stop insertion during the battery cell winding process is achieved, thereby significantly improving the production efficiency of lithium batteries, while ensuring the continuity and stability of the battery cell winding. The method of the present invention can flexibly adjust the insertion parameters and is suitable for battery cell winding processes of different specifications and requirements, which increases the flexibility and applicability of the method and has good versatility and practical value;

[0031] 3) The PLC controller is used to realize automatic control, which reduces the difficulty and cost of manual operation and improves the automation level and production efficiency of the production line. The battery cell winding equipment of the present invention integrates the above method and has the characteristics of high efficiency, accuracy and stability. It is suitable for the production of large-scale lithium battery cells and has important application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional structural schematic diagram of a state in which the inserting blade and the rolling needle of the rolling needle mechanism and the inserting blade mechanism of the present invention are both perpendicular to the horizontal plane;

[0033] Figure 2It is a schematic diagram of the three-dimensional structure of the needle winding mechanism and the inserting sheet mechanism of the present invention, in which the inserting sheet falls in a direction away from the needle winding mechanism;

[0034] Figure 1 and Figure 2 In the figure, the markings are as follows: 1- rolling needle, 2- insert piece.

[0035] Figure 3 The electronic cam motion curve diagram generated in Example 1 of the method for realizing non-stop chip insertion during the battery core winding process of the present invention;

[0036] Figure 4 The electronic cam motion curve diagram generated in Example 2 of the method for realizing non-stop chip insertion during the battery core winding process of the present invention;

[0037] Figure 5 The electronic cam motion curve diagram generated in Example 3 of the method for realizing non-stop chip insertion during the battery cell winding process of the present invention;

[0038] Figure 6 This is a graph of the electronic cam motion curve generated in Example 4 of the method for realizing non-stop chip insertion during the battery cell winding process of the present invention. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] In this embodiment, refer to Figure 1-Figure 6 The method for realizing non-stop cell insertion during the cell winding process specifically implemented includes the following steps:

[0041] The first step is to set the reference angle. The reference angle is defined as the angle when the winding needle 1 of the winding needle mechanism rotates to a certain angle. At this time, the reference angle is set to 0°. In this embodiment, when setting the reference angle, the winding needle 1 of the winding needle mechanism and the inserting blade 2 of the inserting blade mechanism are controlled to be perpendicular to the horizontal plane. The reference angle is used to obtain the starting angle of the winding needle 1 of the winding needle mechanism, and the reference angle when the inserting blade 2 of the inserting blade mechanism is vertically upward. The reference angle is set to 0°, and the starting angle of the winding needle 1 of the winding needle mechanism is also set to 0°, so that when the reference angle is 0°, the inserting blade 2 of the inserting blade mechanism and the winding needle 1 of the winding needle mechanism are both perpendicular to the horizontal plane.

[0042] The second step is to obtain the starting angle of the inserting sheet, control the servo motor of the needle winding mechanism, and make the needle 1 of the needle winding mechanism rotate in the normal winding direction. At this time, the inserting sheet mechanism is driven by the needle winding mechanism to rotate synchronously. The rotation angle A of the needle winding mechanism is calculated from the reference angle. The current angle of the needle winding mechanism 1 gradually increases from the reference angle of 0° until the inserting sheet 2 of the inserting sheet mechanism is observed to deviate in the direction away from the needle winding under the action of its own gravity and centrifugal force, and then the needle winding mechanism is controlled to stop rotating. At this time, it is necessary to pay attention to the insertion sheet 2 of the inserting sheet mechanism falling away from the needle winding. At this moment, the insertion sheet 2 of the inserting sheet mechanism will deviate in the direction away from the needle winding under the action of its own gravity and centrifugal force, and obtain the rotation angle A of the needle winding mechanism at this time. The rotation angle A is the total angle after the needle winding rotates a certain number of times. Because the winding speed of the needle winding is fast enough, the insertion sheet cannot be observed to deviate in the first circle. That is to say, when the insertion sheet is observed to deviate, the needle winding has been wound several times, and the rotation angle A has reached several multiples of 360°.

[0043] By taking the remainder of the rotation angle A and 360°, the starting insertion angle a at which the insertion mechanism starts the insertion action is obtained. The starting insertion angle is the angle remaining after dividing the rotation angle A by several complete circles. The starting insertion angle a obtained by taking the remainder of the rotation angle A and 360° is less than 90°.

[0044] In the third step, the program sets the number of turns of the inserting mechanism to start the inserting action as the Nth turn, and the Nth turn is the number of turns of the winding needle mechanism. When the winding needle mechanism drives the inserting mechanism to rotate to the Nth turn, the inserting mechanism starts the inserting action, and the formula N*360°+a is used to calculate the absolute angle B at the start of the insertion.

[0045] The fourth step is to obtain the stroke angle C of the plug-in mechanism's plug-in 2 in realizing the entire plug-in action. The stroke angle C is not greater than 180°. Within the stroke angle C, it is necessary to ensure that the plug-in does not interfere with the normal cell winding action from the start of the plug-in action to the completion of the plug-in action. The stroke angle C refers to the angle of rotation of the winding needle mechanism during the period from the start of the plug-in action to the completion of the plug-in action, and the absolute angle D of the plug-in end is obtained using the formula B+C. The absolute angle D of the plug-in end refers to the total angle of rotation from the start of the needle mechanism to the completion of the complete plug-in action.

[0046] The fifth step is to obtain the total stroke L of the insert 2 of the insert mechanism from the start of the insert action to the completion of the insert action. The total stroke L refers to the horizontal movement stroke of the insert during the entire process of the servo motor of the insert mechanism driving the insert from the initial position to the completion of the insert action.

[0047] Step 6: Based on the above parameters, an electronic cam is generated on the PLC side to control the inserting blade 2 of the inserting mechanism to realize horizontal inserting action. Specifically, the electronic cam motion curve is generated on the PLC program setting side according to the stroke angle C set in the fourth step and the total stroke L parameters in the fifth step. The electronic cam motion curve is used to control the inserting blade 2 of the inserting mechanism to realize horizontal inserting action according to the trajectory of the electronic cam through the program. When the winding needle 1 of the winding needle mechanism reaches the starting absolute angle B, the electronic cam relationship is coupled with the winding needle servo motor as the main axis and the inserting blade servo motor as the slave axis.

[0048] The seventh step, during the cell winding process, when the rotation angle of the winding needle 1 of the winding needle mechanism reaches the absolute angle B at the beginning of the insertion, the program controls the insertion mechanism to drive the insertion sheet to be inserted into the cell being wound by the winding needle along the horizontal direction according to the electronic cam motion curve generated in the sixth step. At this time, the insertion sheet is pushed horizontally to the periphery of the cell until the rotation angle of the winding needle 1 of the winding needle mechanism reaches the absolute angle D at the end of the insertion sheet. The cell is inserted without stopping the machine, and the cell winding is continued while the sheet is inserted, so that the electrode sheet and the diaphragm continue to be wound around the sheet and the periphery of the cell to the expected number of turns. Finally, the cell winding is completed, and the sheet is removed by the insertion mechanism, and the electrode sheet and the diaphragm are cut off by the cutting mechanism.

[0049] Example 1: First, the reference angles when the inserting blade 2 of the inserting mechanism is vertically upward and the winding needle 1 of the winding needle mechanism is vertically upward are set to 0°, and then the servo motor of the winding needle mechanism is controlled to rotate the winding needle at a preset speed. When the winding needle rotates to 780°, it is observed that the inserting blade begins to deviate in the direction away from the winding needle under the action of its own gravity and centrifugal force. At this time, the winding needle stops rotating, and the current winding needle rotation angle A is recorded as 780°. The modulus of 780° and 360° is obtained to obtain the starting inserting blade angle a as 60°. Then, the number of turns of the inserting blade mechanism starting to insert the blade is set to the 6th turn. According to the formula: 6*360+60°, the absolute angle B of the inserting blade starting is calculated to be 2220°. Then, the stroke angle C of the inserting blade mechanism completing the entire inserting action is set to 180°. According to the formula: B+C corresponds to 2220°+180°, the absolute angle D of the inserting blade ending is calculated to be 2400°. At the same time, the total stroke L of the inserting mechanism from the initial position to the inserting completion position is recorded as 190 mm. Based on the above parameters, an electronic cam is generated on the PLC end, with the stroke angle C of 180° as the maximum value of the horizontal coordinate and the total stroke L of 190 mm as the maximum value of the vertical coordinate, to establish a two-dimensional coordinate system, such as Figure 3As shown, a motion curve from the origin to the end point of the insertion is drawn in the established two-dimensional coordinate system as the electronic cam motion curve of the insertion mechanism. The angle corresponding to the origin in the motion curve is the starting absolute angle B, which is 2220°, and the angle corresponding to the end point is the ending absolute angle D, which is 2400°. When the winding needle rotates to 2220°, the electronic cam coupling is performed with the winding needle servo motor as the main axis and the insertion servo motor as the slave axis. In the normal cell winding process, when the winding needle rotates to 2220°, the insertion mechanism starts to insert the sheet under the control of the electronic cam; when the winding needle rotates to 2400°, the insertion mechanism completes the insertion action, realizing the non-stop insertion. While inserting the sheet, the cell winding is continued, so that the pole piece and the diaphragm continue to be wound around the insertion sheet and the cell to the expected number of turns, and finally the cell winding is completed, and the insertion sheet is pulled out by the insertion mechanism, and the pole piece and the diaphragm are cut off by the cutting mechanism.

[0050] Example 2: First, the reference angles when the inserting sheet 2 of the inserting sheet mechanism is vertically upward and the winding needle 1 of the winding needle mechanism is vertically upward are set to 0°, and then the servo motor of the winding needle mechanism is controlled to rotate the winding needle at a preset speed. When the winding needle rotates to 1160°, it is observed that the inserting sheet begins to deviate away from the winding needle under the action of its own gravity and centrifugal force. At this time, the winding needle stops rotating, and the current winding needle rotation angle A is recorded as 1160°. The modulus of 1160° and 360° is obtained to obtain the starting inserting sheet angle a of 80°. Since the sizes of the pole pieces and diaphragms of different types of battery cells are different, the sizes and weights of the inserting sheets used are also different. Therefore, the inserting sheet angle a corresponding to different types of battery cells is also different. The inserting sheet angle a needs to be reset for the winding process of different types of battery cells. Then, the number of turns of the inserting sheet mechanism is set to the 5th turn. According to the formula: 5*360+80°, the inserting sheet starting absolute angle B is calculated to be 1880°. Then set the stroke angle C of the insert mechanism to complete the entire insert action to 160°. According to the formula: B+C corresponds to 2220°+180°, the absolute angle D of the insert end is calculated to be 2040°. At the same time, the total stroke L of the insert mechanism from the initial position to the insert completion position is recorded as 190mm. Based on the above parameters, an electronic cam is generated on the PLC end, with the stroke angle C of 160° as the maximum value of the horizontal coordinate and the total stroke L of 190mm as the maximum value of the vertical coordinate, to establish a two-dimensional coordinate system, such as Figure 4As shown, a motion curve from the origin to the end point of the insert is drawn in the established two-dimensional coordinate system as the electronic cam motion curve of the insert mechanism. The angle corresponding to the origin in the motion curve is the starting absolute angle B, which is 1880°, and the angle corresponding to the end point is the ending absolute angle D, which is 2040°. When the winding needle rotates to 1880°, the electronic cam coupling is performed with the winding needle servo motor as the main axis and the insert servo motor as the slave axis. In the normal cell winding process, when the winding needle rotates to 1880°, the insert mechanism starts inserting the sheet under the control of the electronic cam; when the winding needle rotates to 2040°, the insert mechanism completes the insert action, realizing the non-stop inserting. While inserting the sheet, the cell winding is continued, so that the pole piece and the diaphragm continue to be wound around the insert and the cell to the expected number of turns, and finally the cell winding is completed, and the insert is pulled out by the insert mechanism, and the pole piece and the diaphragm are cut off by the cutting mechanism.

[0051] Example 3: First, set the reference angles of the inserting mechanism's inserting blade 2 and the winding needle 1 to 0°, then control the winding needle mechanism's servo motor to rotate the winding needle at a preset speed. When the winding needle rotates to 1510°, it is observed that the inserting blade begins to deviate away from the winding needle under its own gravity and centrifugal force. At this time, the winding needle stops rotating, and the current winding needle rotation angle A is recorded as 1510°. The modulus of 1510° and 360° is obtained to obtain the starting inserting blade angle a of 70°. Since the sizes of pole pieces and diaphragms of different types of battery cells are different, the sizes and weights of the inserting blades used are also different. Therefore, the inserting blade angle a corresponding to different types of battery cells is also different. The inserting blade angle a needs to be reset for the winding process of different types of battery cells. Then set the inserting blade mechanism's starting inserting blade number parameter to the 7th turn. According to the formula: 7*360+70°, the inserting blade's starting absolute angle B is calculated to be 2590°. Then set the stroke angle C of the insert mechanism to complete the entire insert action to 140°. According to the formula: B+C corresponds to 2590°+140°, the absolute angle D of the insert end is calculated to be 2730°. At the same time, the total stroke L of the insert mechanism from the initial position to the insert completion position is recorded as 190mm. Based on the above parameters, an electronic cam is generated on the PLC end, with the stroke angle C of 140° as the maximum value of the horizontal coordinate and the total stroke L of 190mm as the maximum value of the vertical coordinate, to establish a two-dimensional coordinate system, such as Figure 5As shown, a motion curve from the origin to the end point of the insert is drawn in the established two-dimensional coordinate system as the electronic cam motion curve of the insert mechanism. The angle corresponding to the origin in the motion curve is the starting absolute angle B, which is 2590°, and the angle corresponding to the end point is the ending absolute angle D, which is 2730°. When the winding needle rotates to 2590°, the electronic cam coupling is performed with the winding needle servo motor as the main axis and the insert servo motor as the slave axis. In the normal cell winding process, when the winding needle rotates to 2590°, the insert mechanism starts inserting the sheet under the control of the electronic cam; when the winding needle rotates to 2730°, the insert mechanism completes the insert action, realizing the non-stop inserting, and the cell winding is continued while the sheet is inserted, so that the pole piece and the diaphragm continue to be wound around the insert and the cell to the expected number of turns, and finally the cell winding is completed, and the insert is pulled out by the insert mechanism, and the pole piece and the diaphragm are cut off by the cutting mechanism.

[0052] Example 4: First, set the reference angles of the inserting mechanism's inserting blade 2 vertically upward and the winding needle 1 vertically upward to 0°, then control the winding needle mechanism's servo motor to rotate the winding needle at a preset speed. When the winding needle rotates to 445°, it is observed that the inserting blade begins to deviate away from the winding needle under its own gravity and centrifugal force. At this time, the winding needle stops rotating, and the current winding needle rotation angle A is recorded as 445°. The modulus of 445° and 360° is obtained to obtain the starting inserting blade angle a of 85°. Since the sizes of pole pieces and diaphragms wound by different types of battery cells are different, the sizes and weights of the inserting blades used are also different. Therefore, the inserting blade angle a corresponding to different types of battery cells is also different. The inserting blade angle a needs to be reset for the winding process of different types of battery cells. Then set the inserting blade mechanism's starting inserting blade number parameter to the 5th turn. According to the formula: 5*360+85°, the inserting blade's starting absolute angle B is calculated to be 1885°. Then set the stroke angle C of the insert mechanism to complete the entire insert action to 120°. According to the formula: B+C corresponds to 1885°+120°, the absolute angle D of the insert end is calculated to be 2005°. At the same time, the total stroke L of the insert mechanism from the initial position to the insert completion position is recorded as 190mm. Based on the above parameters, an electronic cam is generated on the PLC end, with the stroke angle C of 120° as the maximum value of the horizontal coordinate and the total stroke L of 190mm as the maximum value of the vertical coordinate, to establish a two-dimensional coordinate system, such as Figure 6As shown, a motion curve from the origin to the end point of the inserting sheet is drawn in the established two-dimensional coordinate system as the electronic cam motion curve of the inserting sheet mechanism. The angle corresponding to the origin in the motion curve is the starting absolute angle B, which is 1885°, and the angle corresponding to the end point is the ending absolute angle D, which is 2005°. When the winding needle rotates to 1885°, the electronic cam coupling is performed with the winding needle servo motor as the main axis and the inserting sheet servo motor as the slave axis. In the normal cell winding process, when the winding needle rotates to 1885°, the inserting sheet mechanism starts inserting the sheet under the control of the electronic cam; when the winding needle rotates to 2005°, the inserting sheet mechanism completes the inserting action, realizing the non-stop inserting sheet. While inserting the sheet, the cell winding is continued, so that the pole piece and the diaphragm continue to be wound around the inserting sheet and the cell to the expected number of turns, and finally the cell winding is completed, and the inserting sheet is pulled out by the inserting sheet mechanism, and the pole piece and the diaphragm are cut off by the cutting mechanism.

[0053] In addition, the present embodiment further provides a battery cell winding device, including a winding needle mechanism, a sheet inserting mechanism, a servo motor and a PLC controller, wherein the PLC controller is configured to execute a method for inserting sheets without stopping the battery cell winding process. A sensor for detecting the rotation angle of the winding needle mechanism is also included, and the sensor is connected to the PLC controller to transmit the detected rotation angle information to the PLC controller.

[0054] The parameters that need to be controlled in the method of realizing non-stop insertion during the battery cell winding process can all be recorded and adjusted through the PLC controller, such as setting the adjustment reference angle, recording the adjustment rotation angle A, recording the adjustment start insertion angle a, recording the adjustment insertion start absolute angle B, recording the adjustment stroke angle C, recording the adjustment insertion end absolute angle D, recording the adjustment insertion action stroke L and generating and entering the electronic cam motion curve.

[0055] The winding needle mechanism is controlled by a winding needle servo motor to rotate the winding needle. The inserting plate mechanism includes a driving device and an inserting plate. The driving device of the inserting plate mechanism is composed of an inserting plate servo motor. The driving device is used to drive the inserting plate to move in the horizontal direction. The inserting plate servo motor cooperates with the electronic cam to realize the inserting action.

[0056] PLC controller is used for automatic control, and angle parameters and electronic cam technology are used to achieve precise control of the insertion process, which improves the quality and efficiency of battery cell winding and realizes non-stop insertion during battery cell winding, thereby significantly improving the production efficiency of lithium batteries. At the same time, the continuity and stability of battery cell winding are guaranteed, the difficulty and cost of manual operation are reduced, and the automation level and production efficiency of the production line are improved. It has the characteristics of high efficiency, accuracy and stability, is suitable for large-scale production and manufacturing of lithium battery cells, and has important application value.

[0057] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as the protection scope of the present invention.

Claims

1. A method for inserting cells without stopping the cell winding process, characterized in that The method comprises the following steps: The first step is to set the reference angle. The reference angle is defined as the angle at which the winding needle of the winding needle mechanism rotates. At this time, the reference angle is set to 0°. The second step is to obtain the starting angle of inserting the sheet, control the servo motor of the needle winding mechanism, and make the needle of the needle winding mechanism rotate in the normal winding direction. At this time, the sheet inserting mechanism is driven by the needle winding mechanism to rotate synchronously until it is observed that the sheet of the sheet inserting mechanism deviates in the direction away from the needle winding under the action of its own gravity and centrifugal force. Then, the needle winding mechanism is controlled to stop rotating, and the rotation angle A of the needle winding mechanism at this time is obtained. The rotation angle A of the needle winding mechanism is calculated from the reference angle. After taking the remainder of the rotation angle A and 360°, the starting angle a of the sheet inserting mechanism at the beginning of the sheet inserting action is obtained; The third step is to set the number of turns of the inserting mechanism to the Nth turn, which is the number of turns of the needle winding mechanism. When the needle winding mechanism drives the inserting mechanism to rotate to the Nth turn, the inserting mechanism starts the inserting action, and the absolute angle B at the start of the insertion is calculated using the formula N*360°+a. The fourth step is to obtain the stroke angle C of the inserting mechanism when the inserting mechanism realizes the entire inserting action. The stroke angle C refers to the angle of rotation of the needle winding mechanism during the period from the start of the inserting action to the completion of the inserting action, and the absolute angle D of the end of the inserting action is obtained by using the formula B+C; Step 5: Obtain the total stroke L of the inserting mechanism from the start of the inserting action to the completion of the inserting action; Step 6: Generate an electronic cam motion curve at the PLC program setting end according to the stroke angle C set in the fourth step and the total stroke L set in the fifth step. The electronic cam motion curve is used to control the inserting piece of the inserting mechanism to realize horizontal inserting motion according to the trajectory of the electronic cam through the program. The seventh step, during the cell winding process, when the rotation angle of the winding needle mechanism reaches the absolute angle B for the start of insertion, the program controls the insertion mechanism to drive the insertion piece to be inserted horizontally into the cell being wound by the winding needle according to the electronic cam motion curve generated in the sixth step, until the rotation angle of the winding needle mechanism reaches the absolute angle D for the end of insertion, thus completing the cell insertion without stopping the machine.

2. According to claim 1, the method for realizing non-stop cell insertion during the cell winding process is characterized in that: In the first step, when setting the reference angle, the winding needle of the winding needle mechanism and the inserting blade of the inserting blade mechanism are controlled to be perpendicular to the horizontal plane.

3. The method for realizing non-stop chip insertion during the battery cell winding process according to claim 2, characterized in that: In the second step, the starting insertion angle a obtained by taking the remainder of the rotation angle A and 360° is less than 90°.

4. The method for realizing non-stop chip insertion during the battery cell winding process according to any one of claims 1 to 3, characterized in that: In the fourth step, the stroke angle C is not greater than 180°. Within the stroke angle C, it is necessary to ensure that the insertion action from the beginning to the completion of the insertion action does not interfere with the normal winding action of the battery cell.

5. The method for realizing non-stop chip insertion during the battery cell winding process according to any one of claims 1 to 3, characterized in that: In the third step, the parameter N for starting the insertion action is an integer value preset according to the battery cell specifications and winding requirements.

6. The method for realizing non-stop chip insertion during the battery cell winding process according to any one of claims 1 to 3, characterized in that: When the winding needle of the winding needle mechanism reaches the starting absolute angle B, the winding needle servo motor is used as the main axis and the inserting sheet servo motor is used as the slave axis to couple the electronic cam relationship.

7. The method for realizing non-stop chip insertion during the battery cell winding process according to any one of claims 1 to 3, characterized in that: In the sixth step, a two-dimensional coordinate system is established with the stroke angle C as the maximum value of the horizontal coordinate and the total stroke L as the maximum value of the vertical coordinate. A motion curve from the origin to the end point of the insert is drawn in the established two-dimensional coordinate system as the electronic cam motion curve of the insert mechanism. The angle corresponding to the origin in the motion curve is the starting absolute angle B, and the angle corresponding to the end point is the ending absolute angle D.

8. A battery cell winding device, characterized in that: The invention comprises a winding needle mechanism, a sheet inserting mechanism, a servo motor and a PLC controller, wherein the PLC controller is configured to execute the method for inserting sheets without stopping the battery cell winding process described in any one of claims 1 to 7.

9. The battery cell winding device according to claim 8, characterized in that: The inserting piece mechanism comprises a driving device and an inserting piece, and the driving device is used for driving the inserting piece to move in a horizontal direction.

10. The battery cell winding device according to claim 8 or 9, characterized in that: It also includes a sensor for detecting the rotation angle of the needle winding mechanism, and the sensor is connected to the PLC controller and is used to transmit the detected rotation angle information to the PLC controller.

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