Tension control system of battery pole piece and battery coating equipment

Abstract

The invention relates to the technical field of batteries, particularly provides a tension control system of a battery pole piece and battery coating equipment, and aims to solve the problem of accurately detecting the tension of the battery pole piece. In order to achieve the purpose, the system provided by the invention comprises a tension fluctuation detection module and a tension control module, and the relative position between the tension fluctuation detection module and a transmission mechanism of the battery pole piece is fixed; the tension fluctuation detection module is used for detecting the distance between the tension fluctuation detection module and the battery pole piece on the transmission mechanism and acquiring the tension fluctuation actual value of the battery pole piece according to the distance; the tension control module is used for determining the adjusting quantity of the tension adjusting mechanism according to the tension fluctuation actual value and the target range of the tension fluctuation of the battery pole piece, and controlling the tension adjusting mechanism to adjust the tension of the battery pole piece according to the adjusting quantity; the target range is the tension fluctuation range of the battery pole piece under the condition that the tension of the battery pole piece is uniformly distributed. Based on the system, the tension change of the battery pole piece can be accurately detected, and uniform tension distribution of the battery pole piece can be ensured.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pole piece tension control system and a battery coating device. Background Art

[0002] The production of lithium battery pole pieces includes multiple processes such as stirring, coating, rolling, slitting, and sheeting. Among them, coating is the most important part of pole piece production. Coating mainly involves applying the slurry to a foil (such as copper foil or aluminum foil, etc.), and then drying it to form an electrode sheet. The tension of the electrode sheet is then tested using a tension detection roller, and the tension of the electrode sheet is then controlled based on the test results, so that the tension on the electrode sheet is evenly distributed. If the tension on the electrode sheet is unevenly distributed, it may cause abnormalities such as vertical stripes, dark marks, and bulging tendons on the electrode sheet, which will ultimately affect the service life of the lithium battery.

[0003] The slurry drying process during drying will affect the surface tension of the foil, which may cause uneven tension on the foil surface. However, the tension detection roller cannot effectively detect the tension changes caused by slurry drying, and cannot effectively control the uniform distribution of tension on the electrode sheet, which ultimately affects the quality of the electrode sheet.

[0004] Accordingly, the art needs a new technical solution to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present application is proposed to solve or at least partially solve the technical problem of accurately detecting and controlling the tension of the electrode sheet in the battery coating process.

[0006] In a first aspect, a tension control system for a battery pole piece is provided, the system being applied to a battery manufacturing device, the battery manufacturing device comprising a transmission mechanism and a tension adjustment mechanism for the battery pole piece, the system comprising a tension fluctuation detection module and a tension control module, the relative position between the tension fluctuation detection module and the transmission mechanism being fixed;

[0007] The tension fluctuation detection module is used to detect the distance between itself and the battery pole piece on the transmission mechanism, and obtain the actual value of the tension fluctuation of the battery pole piece according to the distance;

[0008] The tension control module is used to determine the adjustment amount of the tension adjustment mechanism according to the actual value of the tension fluctuation and the target range of the battery electrode tension fluctuation, and

[0009] Controlling the tension adjustment mechanism to adjust the tension of the battery electrode sheet according to the adjustment amount so that the actual value of the tension fluctuation is within the target range;

[0010] Wherein, the target range is the tension fluctuation range of the battery electrode when the tension of the battery electrode is evenly distributed.

[0011] In a technical solution of the tension control system of the battery pole piece, the tension fluctuation detection module is used to:

[0012] If the distance is outside the normal distance range, obtaining an actual value of the tension fluctuation of the battery electrode according to the distance;

[0013] Wherein, the normal distance range is: the distance range between the tension fluctuation detection module and the battery pole piece when the tension of the battery pole piece is evenly distributed.

[0014] In a technical solution of the tension control system of the battery pole piece, the tension fluctuation detection module includes a distance sensor and an electromagnetic proportional valve;

[0015] The distance sensor is used to detect the distance between the tension fluctuation detection module and the battery electrode, and convert the distance into an electrical signal;

[0016] The electromagnetic proportional valve is used to convert the electrical signal into a pressure value, and the tension fluctuation detection module is used to use the pressure value as the actual value of the tension fluctuation.

[0017] In a technical solution of the tension control system of the above-mentioned battery pole piece, the distance sensor is an infrared distance measuring sensor.

[0018] In a technical solution of the tension control system of the battery pole piece, the tension fluctuation detection module is used to: if the electrical signal is outside the signal range [A, B], control the electromagnetic proportional valve to convert the electrical signal into a pressure value;

[0019] in,

[0020] A is the lower limit value of the electric signal, which is the electric signal obtained by converting the minimum normal distance by the distance sensor, and the minimum normal distance is the minimum distance between the tension fluctuation detection module and the battery electrode when the tension of the battery electrode is evenly distributed;

[0021] B is the upper limit value of the electrical signal, which is an electrical signal obtained by converting the maximum normal distance by the distance sensor. The maximum normal distance is the maximum distance between the tension fluctuation detection module and the battery pole piece when the tension of the battery pole piece is evenly distributed.

[0022] In a technical solution of the tension control system of the battery pole piece, the target range of the tension fluctuation is obtained by:

[0023] Converting the lower limit value A of the electrical signal into a first pressure value through the electromagnetic proportional valve, and taking the first pressure value as the minimum value of the target range;

[0024] Converting the electrical signal upper limit value B into a second pressure value through the electromagnetic proportional valve, and taking the second pressure value as the maximum value of the target range;

[0025] A target range of the tension fluctuation is obtained according to the minimum value and the maximum value.

[0026] In one technical solution of the tension control system of the battery pole piece, the tension control module is used to:

[0027] Obtaining a deviation between the actual value of the tension fluctuation and the target range of the tension fluctuation;

[0028] A PI operation is performed on the deviation to determine the adjustment amount of the tension adjustment mechanism.

[0029] In one technical solution of the tension control system of the battery pole piece, the tension control module is used to:

[0030] Obtaining the minimum and maximum values ​​of the target range;

[0031] Obtaining a first deviation between the actual value of the tension fluctuation and the minimum value, and / or obtaining a second deviation between the actual value of the tension fluctuation and the maximum value;

[0032] A PI operation is performed on the first deviation and / or the second deviation to determine the adjustment amount.

[0033] In a second aspect, a battery coating device is provided, wherein the battery coating device comprises a transmission mechanism for a battery pole piece, a tension adjustment mechanism, and a tension control system for the battery pole piece provided in the first aspect.

[0034] In a technical solution of the above-mentioned battery coating equipment, the battery pole piece is a battery pole piece dried by the battery coating equipment, and the tension fluctuation detection module in the tension control system is used to detect the distance between itself and the dried battery pole piece.

[0035] The above one or more technical solutions of the present application have at least one or more of the following beneficial effects:

[0036] In a technical solution for implementing the tension control system of the battery pole piece provided in the present application, the tension control system is applied to a battery manufacturing device, the battery manufacturing device includes a transmission mechanism and a tension adjustment mechanism of the battery pole piece, the tension control system includes a tension fluctuation detection module and a tension control module, and the relative position between the tension fluctuation detection module and the transmission mechanism is fixed. The tension fluctuation detection module is used to detect the distance between itself and the battery pole piece on the transmission mechanism, and obtain the actual value of the tension fluctuation of the battery pole piece according to the distance; the tension control module is used to determine the adjustment amount of the tension adjustment mechanism according to the actual value of the tension fluctuation and the target range of the tension fluctuation of the battery pole piece, and control the tension adjustment mechanism to adjust the tension of the battery pole piece according to the adjustment amount, so that the actual value of the tension fluctuation is within the target range; wherein the target range is the tension fluctuation range of the battery pole piece when the tension of the battery pole piece is evenly distributed.

[0037] When the relative position between the tension fluctuation detection module and the transmission mechanism is fixed, if the tension of the battery pole piece on the transmission mechanism changes, the distance between the battery pole piece and the tension fluctuation detection module will also change. Whether it is a slight tension change or a significant tension change, it can be detected by the distance between the battery pole piece and the tension fluctuation detection module, so that the tension of the battery pole piece can be accurately adjusted. Based on this, when coating through the battery coating equipment, even if the tension on the foil surface changes due to the drying of the slurry, it can be accurately detected by the above scheme and the tension on the foil surface can be evenly distributed. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The disclosure of the present application will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. Among them:

[0039] Figure 1 is a schematic diagram of the main structure of a battery pole piece tension control system according to an embodiment of the present application;

[0040] Figure 2 It is a schematic diagram of a process of controlling the tension of a battery pole piece in a coating process using the tension control system provided by the present application according to an embodiment of the present application;

[0041] Figure 3 The invention relates to a process of controlling the tension of a battery pole piece in a rolling process by using a tension control method provided by the prior art. DETAILED DESCRIPTION

[0042] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0043] In the description of this application, a "module" may include hardware, software, or a combination of both. A module may include hardware circuits, various suitable sensors, communication ports, and memory, and may also include software components, such as program code, or a combination of software and hardware. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B.

[0044] An embodiment of the tension control system of the battery pole piece provided in the present application is described below.

[0045] In this embodiment, the tension control system is applied to battery manufacturing equipment. The battery manufacturing equipment may include a transmission mechanism and a tension adjustment mechanism for battery pole pieces. The transmission mechanism is used to transmit the battery pole pieces, and the tension adjustment mechanism is used to adjust the tension of the battery pole pieces. The production of lithium battery pole pieces includes multiple processes such as stirring, coating, rolling, slitting, and sheeting. Coating, rolling and other processes require the tension of the battery pole pieces to be controlled to ensure that the tension distribution of the battery pole pieces is uniform. If the above-mentioned process that requires tension control of the battery pole pieces is described as a target process, the battery manufacturing equipment can be understood as equipment used to achieve the target process. For example, the battery manufacturing equipment can be a coating equipment or a rolling equipment.

[0046] See attached Figure 1 , Figure 1 The main structure of a battery pole piece tension control system according to an embodiment of the present application is exemplified. Figure 1 As shown, in this embodiment, the tension control system may include a tension fluctuation detection module and a tension control module, and the relative position between the tension fluctuation detection module and the transmission mechanism in the battery manufacturing equipment is fixed. The battery pole piece can be placed on the transmission mechanism, and the transmission mechanism can drive the battery pole piece to move in the transmission direction to realize the transmission of the battery pole piece. The above relative position can be understood as the relative position of the tension fluctuation detection module and the battery manufacturing equipment in the vertical direction, and the vertical direction is the direction perpendicular to the above transmission direction. If the relative position between the tension fluctuation detection module and the transmission mechanism is fixed, the distance between the tension fluctuation detection module and the transmission mechanism in the above vertical direction is also fixed. Figure 1 The d1 in the figure represents the distance between the tension fluctuation detection module and the transmission mechanism in the vertical direction, and this distance d1 remains unchanged.

[0047] The tension fluctuation detection module and the tension control module are described below.

[0048] 1. Explain the tension fluctuation detection module.

[0049] In this embodiment, the tension fluctuation detection module is used to detect the distance between itself and the battery pole piece on the transmission mechanism, and obtain the actual value of the tension fluctuation of the battery pole piece according to the distance.

[0050] The distance between the tension fluctuation detection module and the battery pole piece on the transmission mechanism can also be understood as the distance in the vertical direction. Figure 1 The d2 in represents this distance. If the tension of the battery pole piece changes, it will cause the battery pole piece to deform, and after the deformation, the distance d2 between the battery pole piece and the tension fluctuation detection module will also change. Therefore, the change value or fluctuation value of the distance d2 can be used to determine the change value or fluctuation value of the tension of the battery pole piece.

[0051] 2. Explain the tension control module.

[0052] In this embodiment, the tension control module is used to determine the adjustment amount of the tension adjustment mechanism according to the actual value of the tension fluctuation and the target range of the battery pole piece tension fluctuation, and control the tension adjustment mechanism to adjust the tension of the battery pole piece according to the adjustment amount so that the actual value of the tension fluctuation is within the target range. The target range is the tension fluctuation range of the battery pole piece when the tension of the battery pole piece is evenly distributed.

[0053] When determining the target range, a person skilled in the art can use the tension fluctuation detection module to obtain the actual values ​​of tension fluctuation of different battery pole pieces multiple times when the tension of the battery pole piece is evenly distributed, and then obtain the minimum and maximum values ​​of the actual values ​​of tension fluctuation, and determine the minimum and maximum values ​​of the target range respectively according to the minimum and maximum values, and then obtain the target range. In addition, uniform tension distribution can be understood as the tensions at different positions on the battery pole piece are relatively close, and the differences are relatively small. For example, the tension deviation at different positions on the battery pole piece is less than a preset deviation threshold. When setting the specific value of the deviation threshold, a person skilled in the art can perform tension detection on a large number of different battery pole pieces with even tension distribution, determine the maximum value of the tension deviation on the battery pole piece, and set the value of the above deviation threshold according to the maximum value.

[0054] The following is a description of how to determine the adjustment amount of the tension adjustment mechanism.

[0055] Specifically, in this embodiment, an automatic control technology can be used to determine the adjustment amount of the tension adjustment mechanism according to the actual value of the tension fluctuation and the target range of the battery electrode tension fluctuation. For example, the above target range is used as a reference signal, the actual value of the tension fluctuation is used as a feedback signal, the tension adjustment mechanism is used as a controlled object, and the adjustment amount of the tension adjustment mechanism is used as the control amount of the controlled object. Then, the deviation between the reference signal and the feedback signal is obtained, and the deviation is processed by an automatic control algorithm to obtain the adjustment amount of the tension adjustment mechanism. In some embodiments, the automatic control algorithm can be a PI (proportional integral) operation, that is, an IP operation is performed on the above deviation to obtain the adjustment amount of the tension adjustment mechanism.

[0056] In some embodiments, the tension control module can determine the adjustment amount of the tension adjustment mechanism in the following manner: obtain the minimum and maximum values ​​of the target range; obtain the first deviation between the actual value of the tension fluctuation and the minimum value, and / or obtain the second deviation between the actual value of the tension fluctuation and the maximum value; perform PI operation on the first deviation and / or the second deviation to determine the adjustment amount. If only the first deviation is subjected to PI operation to determine the adjustment amount, then after adjusting the tension based on the adjustment amount, it can be ensured that the actual value of the tension fluctuation is greater than the minimum value of the target range; if only the second deviation is subjected to IP operation to determine the adjustment amount, then after adjusting the tension based on the adjustment amount, it can be ensured that the actual value of the tension fluctuation is less than the maximum value of the target range. If the first deviation and the second deviation are subjected to PI operation to determine the adjustment amount at the same time, then after adjusting the tension based on the adjustment amount, it can be ensured that the actual value of the tension fluctuation is greater than the minimum value of the target range and less than the maximum value of the target range, that is, it falls within the target range. Therefore, if the actual value of the tension fluctuation is required to be greater than the minimum value of the target range, the PI operation can be performed on the first deviation; if the actual value of the tension fluctuation is required to be less than the maximum value of the target range, the PI operation can be performed on the second deviation; if the actual value of the tension fluctuation is required to fall within the target range, the PI operation can be performed on the first deviation and the second deviation.

[0057] Based on the above-mentioned tension control system, when the relative position between the tension fluctuation detection module and the transmission mechanism remains unchanged, the tension of the battery electrode can be accurately adjusted by utilizing the distance between the tension fluctuation detection module and the battery electrode on the transmission mechanism to ensure uniform tension distribution of the battery electrode.

[0058] Next, the embodiment of the tension control system of the battery pole piece provided in the present application will be described.

[0059] In some embodiments of the present application, the tension fluctuation detection module can be used to perform the following operations:

[0060] If it is detected that the distance between the tension fluctuation detection module and the battery pole piece on the transmission mechanism is outside the normal distance range, it indicates that the tension distribution of the battery pole piece is uneven and needs to be adjusted. Therefore, the actual value of the tension fluctuation of the battery pole piece can be obtained according to the distance. Furthermore, the tension control module can control the tension adjustment mechanism to adjust the tension according to the actual value of the tension fluctuation.

[0061] If the above distance is detected to be within the normal distance range, it indicates that the tension distribution of the battery pole piece is uniform and does not need to be adjusted. Therefore, the actual value of the tension fluctuation of the battery pole piece can be obtained without using the distance. Furthermore, the tension control module will not control the tension adjustment mechanism to adjust the tension.

[0062] The above-mentioned normal distance range is: the distance range between the tension fluctuation detection module and the battery pole piece when the tension of the battery pole piece is evenly distributed.

[0063] Based on the above method, the distance between the tension fluctuation detection module and the battery pole piece on the transmission mechanism can be used to quickly determine whether the tension of the battery pole piece is evenly distributed. In the case of uneven distribution, the actual value of the tension fluctuation can be obtained, and then the tension adjustment mechanism can be controlled to perform tension adjustment, which can not only ensure that the tension of the battery pole piece is evenly distributed, but also avoid frequent control of the tension adjustment mechanism.

[0064] In some embodiments according to the present application, the tension fluctuation detection module may include a distance sensor and an electromagnetic proportional valve. The distance sensor and the electromagnetic proportional valve are described below.

[0065] 1. Explain the distance sensor.

[0066] In this embodiment, the distance sensor can be used to detect the distance between the tension fluctuation detection module and the battery pole piece, and convert the distance into an electrical signal. The distance sensor can detect the distance between itself and the battery pole piece on the transmission mechanism, and use this distance as the distance between the tension fluctuation detection module and the battery pole piece.

[0067] In this embodiment, a conventional sensor capable of realizing distance detection may be used, and in some embodiments, an infrared distance measuring sensor may be used. Based on the infrared distance measuring sensor, the distance can be detected quickly and accurately without contacting the battery electrode.

[0068] 2. Explain the solenoid proportional valve.

[0069] In this embodiment, the electromagnetic proportional valve can be used to convert the electrical signal obtained by the distance sensor into a pressure value, and this pressure value is the actual value of the tension fluctuation obtained by the tension fluctuation detection module.

[0070] In this embodiment, a conventional electromagnetic proportional valve may be used.

[0071] Further, in some embodiments of the present application, the tension fluctuation detection module having a distance sensor and an electromagnetic proportional valve can also be used to perform the following operations:

[0072] If it is detected that the electrical signal obtained by the distance sensor is outside the signal range [A, B], it indicates that the tension distribution of the battery electrode is uneven and needs to be adjusted. Therefore, the electromagnetic proportional valve can be controlled to convert the electrical signal obtained by the distance sensor into a pressure value. Furthermore, the tension control module can control the tension adjustment mechanism to adjust the tension according to the pressure value (i.e., the actual value of the tension fluctuation).

[0073] If the electrical signal obtained by the distance sensor is detected to be within the signal range [A, B], it indicates that the tension of the battery electrode is evenly distributed and does not need to be adjusted. Therefore, the electromagnetic proportional valve may not be controlled to convert the electrical signal obtained by the distance sensor into a pressure value. Furthermore, the tension control module will not control the tension adjustment mechanism to adjust the tension.

[0074] The signal range [A, B] is explained below.

[0075] A is the lower limit value of the electrical signal. The lower limit value of the electrical signal is the electrical signal obtained by converting the minimum normal distance through the distance sensor. The minimum normal distance is the minimum distance between the tension fluctuation detection module and the battery pole piece when the tension of the battery pole piece is evenly distributed.

[0076] B is the upper limit value of the electrical signal. The upper limit value of the electrical signal is the electrical signal obtained by converting the maximum normal distance through the distance sensor. The maximum normal distance is the maximum distance between the tension fluctuation detection module and the battery pole piece when the tension of the battery pole piece is evenly distributed.

[0077] Based on the above method, the electrical signal obtained by the distance sensor can be used to quickly determine whether the tension of the battery pole piece is evenly distributed. In the case of uneven distribution, the electromagnetic proportional valve is controlled to obtain the pressure value (i.e. the actual value of the tension fluctuation), and then the tension adjustment mechanism is controlled to adjust the tension. This can not only ensure that the tension of the battery pole piece is evenly distributed, but also avoid frequent control of the tension adjustment mechanism.

[0078] Further, in some embodiments of the present application, a tension fluctuation detection module having a distance sensor and an electromagnetic proportional valve can be used, and a target range of tension fluctuation can be determined in the following manner. It should be noted that when the target range is used to determine the adjustment amount of the tension adjustment mechanism, the target range obtained in the following manner can be called, and it is not necessary to obtain the target range in the following manner each time the target range is used.

[0079] Specifically, when determining the target range of tension fluctuation, the lower limit value A of the electric signal can be converted into a first pressure value through the electromagnetic proportional valve, and the first pressure value is used as the minimum value of the target range; the upper limit value B of the electric signal can be converted into a second pressure value through the electromagnetic proportional valve, and the second pressure value is used as the maximum value of the target range; finally, the target range of tension fluctuation is obtained based on the minimum value and the maximum value. Based on the above method, the electromagnetic proportional valve can be used to conveniently and accurately obtain the target range of tension fluctuation.

[0080] The following is combined with Figure 2 and attached Figure 3 , the tension control process of the present application and the prior art is described. Among them, Figure 2 The process of controlling the tension of a battery pole piece in a coating process by using the tension control system provided by the present application is exemplified; Figure 3 The process of controlling the tension of battery pole sheets in a rolling process by using the tension control method provided by the prior art is exemplified. The prior art is a tension control method disclosed in a patent application with a patent number of 202111195514.3 and a publication number of CN113894164A.

[0081] like Figure 2 As shown, when the tension control system provided by the present application is used to control the tension of the battery pole piece in the coating process, the infrared distance measuring sensor can detect the distance between itself and the battery pole piece on the transmission mechanism, and convert the distance into an electrical signal; if the electrical signal is outside the signal range [A, B], the electromagnetic proportional valve is controlled to convert the electrical signal into a pressure value (i.e., the actual value of the tension fluctuation). The tension control module can determine the adjustment amount of the tension adjustment mechanism according to the actual value of the tension fluctuation, and send the adjustment amount to the tension driver of the tension adjustment mechanism. The tension driver can control the tension adjustment mechanism to change the tension of the battery pole piece according to the adjustment amount.

[0082] like Figure 3 As shown, when the tension control system provided by the prior art is used to control the tension of the battery pole piece in the rolling process, the signal output by the tension sensor is detected by the tension detection module, and the detection result is sent to the main control module. The tension adjustment amount is obtained by the integral separation fuzzy PID controller in the main control module, and then the tension adjustment amount is sent to the execution module for tension adjustment. Among them, the tension sensor is a PD2525 through-axis tension sensor. This method only controls the tension of the battery pole piece in the rolling process, and cannot effectively detect the tension change caused by the drying of the slurry, so it is impossible to effectively control the uniform distribution of the tension on the battery pole piece, which ultimately affects the quality of the battery pole piece.

[0083] The following is a description of an embodiment of the battery coating equipment provided in the present application.

[0084] In some embodiments according to the present application, the battery coating equipment may include a transmission mechanism for the battery pole piece, a tension adjustment mechanism, and a tension control system for the battery pole piece described in the above system embodiment. The transmission mechanism and the tension adjustment mechanism are both conventional mechanisms of the battery coating equipment. For the control process between the tension control system and the transmission mechanism and the tension adjustment mechanism, refer to the above system embodiment.

[0085] In some embodiments, the battery pole piece is a battery pole piece dried by a battery coating device, and the tension fluctuation detection module in the tension control system is used to detect the distance between itself and the dried battery pole piece. Then, the tension of the battery pole piece is adjusted according to the distance, which can effectively avoid the uneven distribution of tension of the battery pole piece due to drying, and the occurrence of abnormal conditions such as vertical stripes, dark marks, and bulging tendons.

[0086] So far, the technical solution of the present application has been described in conjunction with an embodiment shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A tension control system for a battery pole piece, characterized in that: The system is applied to battery manufacturing equipment, the battery manufacturing equipment includes a transmission mechanism and a tension adjustment mechanism for battery pole pieces, the system includes a tension fluctuation detection module and a tension control module, and the relative position between the tension fluctuation detection module and the transmission mechanism is fixed; The tension fluctuation detection module is used to detect the distance between itself and the battery pole piece on the transmission mechanism, and obtain the actual value of the tension fluctuation of the battery pole piece according to the distance; The tension control module is used to determine the adjustment amount of the tension adjustment mechanism according to the actual value of the tension fluctuation and the target range of the battery electrode tension fluctuation, and Controlling the tension adjustment mechanism to adjust the tension of the battery electrode sheet according to the adjustment amount so that the actual value of the tension fluctuation is within the target range; Wherein, the target range is the tension fluctuation range of the battery electrode when the tension of the battery electrode is evenly distributed.

2. The system according to claim 1, characterized in that The tension fluctuation detection module is used for: If the distance is outside the normal distance range, obtaining an actual value of the tension fluctuation of the battery electrode according to the distance; Wherein, the normal distance range is: the distance range between the tension fluctuation detection module and the battery pole piece when the tension of the battery pole piece is evenly distributed.

3. The system according to claim 1, characterized in that The tension fluctuation detection module includes a distance sensor and an electromagnetic proportional valve; The distance sensor is used to detect the distance between the tension fluctuation detection module and the battery electrode, and convert the distance into an electrical signal; The electromagnetic proportional valve is used to convert the electrical signal into a pressure value, and the tension fluctuation detection module is used to use the pressure value as the actual value of the tension fluctuation.

4. The system according to claim 3, characterized in that The distance sensor is an infrared distance measuring sensor.

5. The system according to claim 3, characterized in that The tension fluctuation detection module is used for: If the electrical signal is outside the signal range [A, B], the electromagnetic proportional valve is controlled to convert the electrical signal into a pressure value; in, A is the lower limit value of the electric signal, which is an electric signal obtained by converting the minimum normal distance by the distance sensor, and the minimum normal distance is the minimum distance between the tension fluctuation detection module and the battery electrode when the tension of the battery electrode is evenly distributed; B is the upper limit value of the electrical signal, which is an electrical signal obtained by converting the maximum normal distance by the distance sensor. The maximum normal distance is the maximum distance between the tension fluctuation detection module and the battery pole piece when the tension of the battery pole piece is evenly distributed.

6. The system according to claim 5, characterized in that The target range of tension fluctuation is obtained by: Converting the lower limit value A of the electrical signal into a first pressure value through the electromagnetic proportional valve, and taking the first pressure value as the minimum value of the target range; Converting the electrical signal upper limit value B into a second pressure value through the electromagnetic proportional valve, and taking the second pressure value as the maximum value of the target range; A target range of the tension fluctuation is obtained according to the minimum value and the maximum value.

7. The system according to claim 1, characterized in that The tension control module is used for: Obtaining a deviation between the actual value of the tension fluctuation and the target range of the tension fluctuation; A PI operation is performed on the deviation to determine the adjustment amount of the tension adjustment mechanism.

8. The system according to claim 7, characterized in that The tension control module is used for: Obtaining the minimum and maximum values ​​of the target range; Obtaining a first deviation between the actual value of the tension fluctuation and the minimum value, and / or obtaining a second deviation between the actual value of the tension fluctuation and the maximum value; A PI operation is performed on the first deviation and / or the second deviation to determine the adjustment amount.

9. A battery coating device, characterized in that: The battery coating equipment comprises a transmission mechanism for battery pole pieces, a tension adjustment mechanism and a tension control system for battery pole pieces according to any one of claims 1 to 8.

10. The battery coating equipment according to claim 9, characterized in that: The battery pole piece is a battery pole piece that has been dried by the battery coating equipment, and the tension fluctuation detection module in the tension control system is used to detect the distance between itself and the dried battery pole piece.

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