A power battery film pasting tension control system and a tension control method

Abstract

This invention discloses a tension control system and method for power battery film application, relating to the field of film application control technology. It includes a testing module, a data acquisition module, a parameter setting module, a parameter optimization module, and a decision-making module. Before the film application process begins, the testing module performs temperature testing on the film material to be tested, obtaining a processing reference table for the film material at different temperatures. Before the actual film application process, the theoretical setting parameters under these temperature conditions are matched with the surface temperature of the film material to be processed in the processing reference table. Tension control is then performed based on these theoretical setting parameters, achieving dynamic tension adjustment according to the surface temperature of the film material to be processed. This prevents the deformation of the film material from exceeding the standard range, improves the success rate of film application, and optimizes the film application effect.

Description

Technical Field

[0001] This invention relates to the field of film application control technology, specifically a power battery film application tension control system and tension control method. Background Technology

[0002] Battery film application involves covering the surface of the battery with a special insulating protective film to achieve electrical insulation between the positive and negative electrodes of the cell and between the cell and the casing, thus preventing internal short circuits from the source and ensuring battery safety. At the same time, it can protect the electrode plates from scratches, dust and moisture damage, stabilize the cell structure, improve assembly accuracy and battery cycle life, and is a necessary step to ensure the compliance and reliability of power batteries.

[0003] However, during actual processing, after the power battery film application equipment has been running for a period of time, due to the gradual accumulation of mechanical heat in the equipment itself and the temperature conduction of the rollers at the film application station, the temperature of the film material that has not been transported to the film application station rises, resulting in a decrease in the elastic modulus. At this time, under the same tension conditions, the deformation will exceed the standard range, and dimensional deviations will occur during film application. How to adjust the tension according to the real-time temperature is a problem that we need to solve. To this end, we now provide a power battery film application tension control system and tension control method. Summary of the Invention

[0004] The purpose of this invention is to provide a power battery film tension control system and tension control method.

[0005] The objective of this invention can be achieved through the following technical solution: a power battery film tension control system, comprising a testing module, a data acquisition module, a parameter setting module, a parameter optimization module, and a decision module;

[0006] The testing module is used to test the membrane material to be tested and obtain a processing comparison table of the membrane material to be tested;

[0007] The data acquisition module is used to acquire the basic battery parameters of the battery to be processed and the membrane parameters of the membrane material to be processed.

[0008] The parameter setting module is used to obtain the corresponding theoretical setting parameters based on the battery basic parameters and film parameters and the processing reference table, and to generate the equipment setting parameters of the film application equipment based on the obtained theoretical setting parameters and film parameters.

[0009] The parameter optimization module is used to tension the film to be processed by the film application equipment according to the set equipment parameters, and generate optimization adjustment instructions based on the tensioning results;

[0010] The decision module is used to optimize and adjust the device settings parameters according to the generated optimization and adjustment instructions.

[0011] Furthermore, the testing process for the membrane material to be tested includes:

[0012] Set different temperature test ranges, and establish corresponding temperature test conditions based on the different temperature test ranges set.

[0013] Under different temperature test conditions, adjust the operating parameters of the film application equipment so that the elongation of the film sample under test reaches the standard elongation that meets the requirements of the film application process, and record the tension value of the film sample under test at the corresponding time. Repeat the test and take the average of several sets of tension values ​​as the standard tension value under the corresponding temperature test conditions.

[0014] The operating parameters of the film-applying equipment for each test were also summarized to obtain the average value of the corresponding operating parameters, which were used as the standard operating parameters corresponding to the standard tension value.

[0015] The test results were summarized to obtain a processing comparison table of battery type, standard elongation, temperature test conditions, standard tension value, and standard operating parameters.

[0016] Furthermore, the data acquisition module consists of several data acquisition terminals, which are deployed in the feeding unit;

[0017] The membrane parameters are collected by the data acquisition terminal deployed in the feeding unit. The membrane parameters include the initial roll diameter of the membrane material to be processed, the real-time roll diameter of the membrane material to be processed, the surface temperature of the membrane material to be processed, and the elongation.

[0018] Furthermore, the process of generating the equipment setting parameters for the film application device includes:

[0019] Based on the basic parameters of the battery to be processed, the corresponding battery type is obtained by searching the processing reference table and marking the standard elongation corresponding to the matched battery type.

[0020] The surface temperature of the film material to be processed is matched with the various temperature test conditions corresponding to the battery type, and then the standard tension value and standard operating parameters corresponding to the matched temperature test conditions are marked.

[0021] Set the standard tension value and standard operating parameters corresponding to this battery type and temperature test conditions as the theoretical setting parameters for the film application equipment;

[0022] Based on the obtained theoretical and membrane parameters, the equipment setting parameters for the film application device are generated.

[0023] Furthermore, the process of tensioning the film material to be processed using the laminating equipment according to the set equipment parameters includes:

[0024] Set the rotation time according to the standard elongation and the equipment settings;

[0025] The film-applying equipment is controlled to run at the standard rotation speed of the feeding unit and the standard rotation speed of the film-applying unit for a certain period of time before stopping, and the elongation is measured.

[0026] Furthermore, the process of generating optimized adjustment instructions based on the tensioning results includes:

[0027] The obtained elongation is compared with the standard elongation to obtain the elongation deviation value;

[0028] Set a difference threshold range. If the elongation deviation value is within the difference threshold range, the film application operation will be performed directly on the battery to be processed.

[0029] If the elongation deviation is greater than the upper limit of the difference threshold range, the first optimization adjustment command is generated.

[0030] If the elongation deviation is less than the lower limit of the difference threshold range, a second optimization adjustment command is generated.

[0031] Furthermore, the process of optimizing and adjusting the equipment settings parameters based on the generated optimization and adjustment instructions includes:

[0032] When the first optimization adjustment command is generated, the fine-tuning target value is calculated based on the elongation deviation value and the difference threshold.

[0033] Calculate the speed compensation value based on the fine-tuning target value;

[0034] The speed compensation value is applied to the feeding unit, and the rotation speed compensation value of the feeding unit is calculated.

[0035] The new rotation speed of the feeding unit is generated based on the rotation speed compensation value of the feeding unit, the elongation deviation value is obtained, and the compensation time is calculated.

[0036] After the feeding unit of the film laminating equipment operates at the new feeding unit's rotation speed for a compensation time, the new elongation is obtained and recorded as... and will Updated to ;

[0037] When the second optimization adjustment command is generated, the stretched portion of the membrane material to be processed is discarded, and the unstretched portion of the membrane material to be processed is re-discharged.

[0038] Furthermore, a method for controlling the tension of a power battery film includes the following steps:

[0039] Test the membrane material to be tested and obtain a processing comparison table of the membrane material to be tested;

[0040] Obtain the basic parameters of the battery to be processed and the membrane parameters of the membrane material to be processed;

[0041] Based on the battery's basic parameters and the membrane parameters, the corresponding theoretical setting parameters are obtained based on the processing reference table. The equipment setting parameters of the film application equipment are then generated based on the obtained theoretical setting parameters and membrane parameters.

[0042] The film-applying equipment tensions the film material to be processed according to the set equipment parameters, and generates optimization adjustment instructions based on the tensioning results;

[0043] The device settings parameters are optimized and adjusted according to the generated optimization and adjustment instructions.

[0044] Compared with the prior art, the beneficial effects of the present invention are:

[0045] This invention uses a testing module to test the temperature of the film material before the film application process begins, obtaining a processing reference table for the film material at different temperatures. Before the actual film application process, the theoretical setting parameters under this temperature condition are matched with the surface temperature of the film material in the processing reference table. Tension control is then performed based on the theoretical setting parameters, enabling dynamic adjustment of tension according to the surface temperature of the film material. This avoids the deformation of the film material exceeding the standard range, improves the success rate of film application, and optimizes the film application effect.

[0046] The parameter optimization module compares the elongation of the membrane material to be processed with the standard elongation to verify the implementation effect of tensioning the membrane material under the theoretically set parameters. If the verification effect is not ideal, the decision module optimizes and adjusts the equipment setting parameters or eliminates tensioning operations that exceed the standard range to further improve the success rate of membrane application. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0048] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation

[0049] like Figure 1 As shown, a power battery film tension control system includes a testing module, a data acquisition module, a parameter setting module, a parameter optimization module, and a decision module.

[0050] The testing module is used to test the membrane material under test and obtain a processing comparison table of the membrane material under test. The process includes:

[0051] Obtain the basic parameters of the power battery under test for testing, and determine the standard elongation that meets the requirements of the film application process based on the basic parameters of the battery.

[0052] Set different temperature test ranges, and establish corresponding temperature test conditions based on the different temperature test ranges set.

[0053] Under different temperature test conditions, adjust the operating parameters of the film application equipment so that the elongation of the film sample under test reaches the standard elongation that meets the requirements of the film application process, and record the tension value of the film sample under test at the corresponding time. Repeat the test and take the average of several sets of tension values ​​as the standard tension value under the corresponding temperature test conditions.

[0054] The operating parameters of the film-applying equipment for each test were also summarized to obtain the average value of the corresponding operating parameters, which were used as the standard operating parameters corresponding to the standard tension value.

[0055] The test results were summarized to obtain a processing comparison table of battery type, standard elongation, temperature test conditions, standard tension value, and standard operating parameters.

[0056] It should be further explained that, in the specific implementation process, the film-applying equipment is equipped with a feeding unit and a film-coating unit. An infrared sensing terminal is also provided at the feeding unit to obtain the first initial roll diameter and the first real-time roll diameter of the film sample to be tested. It should be noted that the film sample to be tested is composed of several single-layer films. The first initial roll diameter is the total outer diameter of the film sample to be tested, and the first real-time roll diameter refers to the outer diameter recorded when the film sample to be tested gradually decreases during use.

[0057] The standard operating parameters of the laminating equipment are specifically the standard rotation speed of the feeding unit and the standard rotation speed of the laminating unit. It should be noted that after the laminating equipment has been running for a period of time, due to the gradual accumulation of mechanical heat in the equipment itself and the temperature conduction of the rollers at the laminating station, the temperature of the film material that has not been transported to the laminating station rises, resulting in a decrease in the elastic modulus. At this time, under the same tension conditions, the elongation of the film material will exceed the standard range, and dimensional deviations will occur during lamination. When the temperature test value rises, a lower tension value should be used to tension the film material to avoid the situation where the elongation of the film material exceeds the standard range, resulting in film material damage or over-tensioning and a deterioration in the protective effect.

[0058] The data acquisition module is used to acquire the basic battery parameters of the battery to be processed and the membrane parameters of the membrane material to be processed. The process includes:

[0059] The data acquisition module consists of several data acquisition terminals, which are deployed in the feeding unit;

[0060] The membrane parameters are collected by the data acquisition terminal deployed in the feeding unit. The membrane parameters include the initial roll diameter of the membrane material to be processed, the real-time roll diameter of the membrane material to be processed, the surface temperature of the membrane material to be processed, and the elongation.

[0061] The initial roll diameter of the film material to be processed is denoted as... The real-time roll diameter of the film material to be processed is recorded as follows: .

[0062] The parameter setting module is used to obtain corresponding theoretical setting parameters based on the battery's basic parameters and the film parameters, using a processing lookup table. It then generates equipment setting parameters for the film-applying device based on these theoretical and film parameters. The process includes:

[0063] Based on the basic parameters of the battery to be processed, the corresponding battery type is obtained by searching the processing reference table and marking the standard elongation corresponding to the matched battery type.

[0064] The surface temperature of the film material to be processed is matched with the various temperature test conditions corresponding to the battery type, and then the standard tension value and standard operating parameters corresponding to the matched temperature test conditions are marked.

[0065] Set the standard tension value and standard operating parameters corresponding to this battery type and temperature test conditions as the theoretical setting parameters for the film application equipment;

[0066] The theoretical parameters include standard rotation speed, standard rotation speed of the coating unit, first initial roll diameter, first real-time roll diameter, and standard elongation.

[0067] Specifically:

[0068] The standard rotational speed of the feeding unit corresponding to the surface temperature of the battery and the film material to be processed is denoted as . The standard rotational speed of the coating unit is denoted as... The first initial volume diameter is denoted as The first real-time volume diameter is denoted as The standard elongation is denoted as L;

[0069] Based on the obtained theoretical and membrane parameters, the equipment setting parameters for the laminating device are generated. These parameters include the rotation speed of the feeding unit and the rotation speed of the laminating unit, denoted as follows: and ,in:

[0070] ;

[0071] .

[0072] The parameter optimization module is used to tension the film material to be processed by the film-applying equipment according to the set equipment parameters, and generate optimization adjustment instructions based on the tensioning results. The process includes:

[0073] Step S401: Set the rotation time according to the standard elongation and the equipment setting parameters, denoted as t. ;

[0074] Step S402: Control the laminating equipment to run at the standard rotation speed of the feeding unit and the standard rotation speed of the laminating unit for the specified time, then stop. Obtain the elongation amount and record it as... ;

[0075] Step S403: Compare the obtained elongation with the standard elongation to obtain the elongation deviation value, which is denoted as... ,but ;

[0076] Step S404: Set the difference threshold range to , The difference threshold is set based on the physical properties of the film to be processed;

[0077] If the elongation deviation is within the difference threshold range, the film application process will be carried out directly on the battery to be processed.

[0078] If the elongation deviation is greater than the upper limit of the difference threshold range, the first optimization adjustment command is generated.

[0079] If the elongation deviation is less than the lower limit of the difference threshold range, a second optimization adjustment command is generated.

[0080] The decision-making module is used to optimize and adjust the equipment settings parameters according to the generated optimization and adjustment instructions. The process includes:

[0081] When the first optimization adjustment command is generated, the fine-tuning target value is calculated based on the elongation deviation value and the difference threshold, denoted as . ,but ;

[0082] The speed compensation value is calculated based on the fine-tuning target value and denoted as follows: ,but ;

[0083] It should be noted that if the elongation of the film laminating equipment still does not reach the standard range after executing the theoretically set parameters, it is because the rotation speed of the feeding unit and the rotation speed of the laminating unit are not fed back to the linear speed at both ends of the film to be processed in the correct proportion, that is, slippage occurs. When the surface of the roller that holds the film roll to be processed is severely worn or there is oil on the surface of the film to be processed, slippage may occur between the film and the roller surface, causing the rotation speed to not be fed back to the linear speed at both ends of the film to be processed in the normal proportion. At this time, the linear speed at both ends of the film to be processed can be compensated by finely adjusting the rotation speed to increase, so that the film to be processed can be stretched to the standard elongation.

[0084] The speed compensation value is applied to the feeding unit, and the speed compensation value of the feeding unit is calculated and denoted as follows. ,but ;

[0085] A new rotational speed for the feeding unit is generated based on the rotational speed compensation value of the feeding unit, denoted as . and will Updated to Obtain the elongation deviation value, calculate the compensation time, and denot it as... ,but ;

[0086] After the feeding unit of the film laminating equipment operates at the new feeding unit's rotation speed for a compensation time, the new elongation is obtained and recorded as... and will Updated to Return to step S403.

[0087] When the second optimization adjustment command is generated, the stretched portion of the membrane material to be processed is discarded, and the unstretched portion of the membrane material to be processed is re-produced, thus invalidating this tensioning task.

[0088] In another embodiment of the present invention, a method for controlling the tension of a power battery film is also disclosed, comprising:

[0089] Step S1: Test the membrane material to be tested and obtain the processing comparison table of the membrane material to be tested;

[0090] Step S2: Obtain the basic parameters of the battery to be processed and the membrane parameters of the membrane material to be processed;

[0091] Step S3: Based on the battery basic parameters and film parameters, obtain the corresponding theoretical setting parameters according to the processing reference table, and generate the equipment setting parameters of the film application equipment according to the obtained theoretical setting parameters and film parameters.

[0092] Step S4: Tension the film to be processed using the film application equipment according to the set equipment parameters, and generate optimization adjustment instructions based on the tensioning results;

[0093] Step S5: Optimize and adjust the equipment settings parameters according to the generated optimization and adjustment instructions.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any modifications or equivalent substitutions made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A power battery film tension control system, characterized in that, It includes a testing module, a data acquisition module, a parameter setting module, a parameter optimization module, and a decision-making module; The testing module is used to test the membrane material to be tested and obtain a processing comparison table of the membrane material to be tested; The data acquisition module is used to acquire the basic battery parameters of the battery to be processed and the membrane parameters of the membrane material to be processed. The parameter setting module is used to obtain the corresponding theoretical setting parameters based on the battery basic parameters and film parameters and the processing reference table, and to generate the equipment setting parameters of the film application equipment based on the obtained theoretical setting parameters and film parameters. The parameter optimization module is used to tension the film to be processed by the film application equipment according to the set equipment parameters, and generate optimization adjustment instructions based on the tensioning results; The decision module is used to optimize and adjust the device settings parameters according to the generated optimization and adjustment instructions.

2. The power battery film tension control system according to claim 1, characterized in that, The testing process for the membrane material to be tested includes: Set different temperature test ranges, and establish corresponding temperature test conditions based on the different temperature test ranges set. Under different temperature test conditions, adjust the operating parameters of the film application equipment so that the elongation of the film sample under test reaches the standard elongation that meets the requirements of the film application process, and record the tension value of the film sample under test at the corresponding time. Repeat the test and take the average of several sets of tension values ​​as the standard tension value under the corresponding temperature test conditions. The operating parameters of the film-applying equipment for each test were also summarized to obtain the average value of the corresponding operating parameters, which were used as the standard operating parameters corresponding to the standard tension value. The test results were summarized to obtain a processing comparison table of battery type, standard elongation, temperature test conditions, standard tension value, and standard operating parameters.

3. The power battery film tension control system according to claim 2, characterized in that, The data acquisition module consists of several data acquisition terminals, which are deployed in the feeding unit; The membrane parameters are collected by the data acquisition terminal deployed in the feeding unit. The membrane parameters include the initial roll diameter of the membrane material to be processed, the real-time roll diameter of the membrane material to be processed, the surface temperature of the membrane material to be processed, and the elongation.

4. The power battery film tension control system according to claim 3, characterized in that, The process of generating the equipment setting parameters for the film application device includes: Based on the basic parameters of the battery to be processed, the corresponding battery type is obtained by searching the processing reference table and marking the standard elongation corresponding to the matched battery type. The surface temperature of the film material to be processed is matched with the various temperature test conditions corresponding to the battery type, and then the standard tension value and standard operating parameters corresponding to the matched temperature test conditions are marked. Set the standard tension value and standard operating parameters corresponding to this battery type and temperature test conditions as the theoretical setting parameters for the film application equipment; Based on the obtained theoretical and membrane parameters, the equipment setting parameters for the film application device are generated.

5. A power battery film tension control system according to claim 4, characterized in that, The process of tensioning the film material to be processed using the laminating equipment according to the set equipment parameters includes: Set the rotation time according to the standard elongation and the equipment settings; The film-applying equipment is controlled to run at the standard rotation speed of the feeding unit and the standard rotation speed of the film-applying unit for a certain period of time before stopping, and the elongation is measured.

6. A power battery film tension control system according to claim 5, characterized in that, The process of generating optimized adjustment instructions based on the tensioning results includes: The obtained elongation is compared with the standard elongation to obtain the elongation deviation value; Set a difference threshold range. If the elongation deviation value is within the difference threshold range, the film application operation will be performed directly on the battery to be processed. If the elongation deviation is greater than the upper limit of the difference threshold range, the first optimization adjustment command is generated. If the elongation deviation is less than the lower limit of the difference threshold range, a second optimization adjustment command is generated.

7. A power battery film tension control system according to claim 6, characterized in that, The process of optimizing and adjusting the equipment settings parameters according to the generated optimization and adjustment instructions includes: When the first optimization adjustment command is generated, the fine-tuning target value is calculated based on the elongation deviation value and the difference threshold. Calculate the speed compensation value based on the fine-tuning target value; The speed compensation value is applied to the feeding unit, and the rotation speed compensation value of the feeding unit is calculated. The new rotation speed of the feeding unit is generated based on the rotation speed compensation value of the feeding unit, the elongation deviation value is obtained, and the compensation time is calculated. After the feeding unit of the film laminating equipment operates at the new feeding unit's rotation speed for a compensation time, the new elongation is obtained and recorded as... and will Updated to ; When the second optimization adjustment command is generated, the stretched portion of the membrane material to be processed is discarded, and the unstretched portion of the membrane material to be processed is re-discharged.

8. A method for controlling the tension of a power battery film according to any one of claims 1 to 7, comprising the following steps: Test the membrane material to be tested and obtain a processing comparison table of the membrane material to be tested; Obtain the basic parameters of the battery to be processed and the membrane parameters of the membrane material to be processed; Based on the battery's basic parameters and the membrane parameters, the corresponding theoretical setting parameters are obtained based on the processing reference table. The equipment setting parameters of the film application equipment are then generated based on the obtained theoretical setting parameters and membrane parameters. The film-applying equipment tensions the film material to be processed according to the set equipment parameters, and generates optimization adjustment instructions based on the tensioning results; The device settings parameters are optimized and adjusted according to the generated optimization and adjustment instructions.

Images