Roller-pressing pressure control method, apparatus and system

Abstract

A roller-pressing pressure control method, apparatus and system. The method comprises: when an edge region of a cathode sheet is located at a roller-pressing position point, which is on an anode strip and is for an upper roller, reducing the roller-pressing pressure of the upper roller for the anode strip, such that the roller-pressing pressure of the upper roller for the anode strip is less than an initial pressure value; and when a non-edge region of the cathode sheet is located at the roller-pressing position point, which is on the anode strip and is for the upper roller, maintaining the roller-pressing pressure of the upper roller for the anode strip at the initial pressure value, wherein the non-edge region of the cathode sheet is the region of the cathode sheet other than the edge region.

Description

Roller pressure control method, device and system

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410706790.9, filed on June 3, 2024, entitled “Roller pressure control method, device and system”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a roller pressure control method, device and system. BACKGROUND

[0004] In the production process of power batteries, the two sides of the anode material belt are covered with upper and lower cathode sheets, which need to be processed by a roller, i.e., the upper and lower cathode sheets are pressed on the anode material belt. However, after passing through the roller, the edge region of the cathode sheet is crushed, resulting in a wire drawing phenomenon in the edge region of the cathode sheet.

[0005] SUMMARY

[0006] The present application provides a roller pressure control method, device and system to solve the problem of the edge region of the cathode sheet being crushed after passing through the roller, resulting in a wire drawing phenomenon in the edge region of the cathode sheet.

[0007] In a first aspect, the present application provides a roller pressure control method applied to a lamination device, the lamination device comprising an upper roller and a lower roller for pressing an anode material belt, and a detection unit, wherein the upper roller and the lower roller are oppositely arranged, the anode material belt is arranged between the upper roller and the lower roller, a plurality of cathode sheets are arranged on the two sides of the anode material belt in turn and staggered, the rotation direction of the upper roller and the lower roller matches the moving direction of the anode material belt, the upper roller and the lower roller cooperate to press the cathode sheets on the anode material belt, a plurality of cut holes are arranged on the anode material belt, and one cathode sheet is included between two adjacent cut holes, the detection unit is used to detect the cut holes on the anode material belt; the method comprises:

[0008] In the case that the edge region of the cathode sheet is located at the roller pressing position point of the upper roller on the anode material belt, the roller pressing pressure of the upper roller on the anode material belt is reduced, so that the roller pressing pressure of the upper roller on the anode material belt is less than the initial pressure value;

[0009] In the case that the non-edge region of the cathode sheet is located at the roller pressing position point of the upper roller on the anode material belt, the roller pressing pressure of the upper roller on the anode material belt is maintained at the initial pressure value, and the non-edge region of the cathode sheet is a region of the cathode sheet other than the edge region;

[0010] wherein, in a case where the edge region of the cathode sheet is located at the press roller position point of the upper roller on the anode strip, reducing the press roller pressure of the upper roller on the anode strip comprises:

[0011] in a case where the detection unit detects the cut hole on the anode strip, obtaining a first running distance of the upper roller at present;

[0012] obtaining a first distance between the cut hole and the press roller position point of the upper roller on the anode strip;

[0013] obtaining a second distance obtained by adding a preset distance to a distance from the cut hole to an adjacent cathode sheet;

[0014] subtracting the second distance from the first distance to obtain a target distance;

[0015] determining a second running distance according to a sum of the first running distance and the target distance;

[0016] in a case where the upper roller runs to the second running distance, reducing the press roller pressure of the upper roller on the anode strip from an initial pressure value to a first pressure value, wherein, in a case where the upper roller runs to the second running distance, the edge region of the cathode sheet is located at the press roller position point of the upper roller on the anode strip.

[0017] In the embodiments of the present application, by the above-mentioned manner, the initial pressure value is used for the press roller in the non-edge region of the cathode sheet, and the press roller pressure value is reduced in the edge region of the cathode sheet, so that the problem of the edge of the cathode sheet being pressed and the cathode sheet being damaged due to the large press roller pressure and the problem of the edge of the cathode sheet being drawn can be avoided while the normal press roller processing of the cathode sheet is met, thereby further reducing the loss rate of the cathode sheet and improving the quality of the cathode sheet.

[0018] In an embodiment of the present application, in a case where the upper roller runs to the second running distance, reducing the press roller pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value comprises:

[0019] in a case where the upper roller runs to the second running distance, gradually reducing the press roller pressure of the upper roller on the anode strip until, in a case where the upper roller continues to run for the second distance, the press roller pressure of the upper roller on the anode strip is reduced to the first pressure value.

[0020] In the embodiments of the present application, the press roller pressure of the upper roller on the anode strip is gradually reduced from the initial pressure value to the first pressure value within the interval in which the upper roller continues to run for the second distance, so that the problem of the edge of the cathode sheet being pressed and the cathode sheet being damaged due to the large press roller pressure and the problem of the edge of the cathode sheet being drawn can be avoided.

[0021] In an embodiment of the present application, in the case that the non-edge region of the cathode sheet is located at the position point of the pressure roller of the upper roller on the anode strip, the pressure of the pressure roller of the upper roller on the anode strip is kept at the initial pressure value, comprising:

[0022] In the case that the upper roller runs to a third running distance, the pressure of the pressure roller of the upper roller on the anode strip is increased from the first pressure value to the initial pressure value, so that in the case that the non-edge region of the cathode sheet is located at the position point of the pressure roller of the upper roller on the anode strip, the pressure of the pressure roller of the upper roller on the anode strip is kept at the initial pressure value, and the third running distance is the sum of the second running distance and a second distance.

[0023] In an embodiment of the present application, in the case that the upper roller runs to a third running distance, the pressure of the pressure roller of the upper roller on the anode strip is gradually increased from the first pressure value to the initial pressure value, so that in the case that the non-edge region of the cathode sheet is located at the position point of the pressure roller of the upper roller on the anode strip, the pressure of the pressure roller of the upper roller on the anode strip is kept at the initial pressure value, to meet the normal pressure roller processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0024] In an embodiment of the present application, in the case that the upper roller runs to a third running distance, the pressure of the pressure roller of the upper roller on the anode strip is increased from the first pressure value to the initial pressure value, comprising:

[0025] In the case that the upper roller runs to a third running distance, the pressure of the pressure roller of the upper roller on the anode strip is gradually increased until the pressure of the pressure roller of the upper roller on the anode strip is increased to the initial pressure value in the case that the upper roller continues to run for a second distance.

[0026] In an embodiment of the present application, in the case that the upper roller runs to a third running distance, the pressure of the pressure roller of the upper roller on the anode strip is gradually increased from the first pressure value to the initial pressure value, so that in the case that the non-edge region of the cathode sheet is located at the position point of the pressure roller of the upper roller on the anode strip, the pressure of the pressure roller of the upper roller on the anode strip is kept at the initial pressure value, to meet the normal pressure roller processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0027] In an embodiment of the present application, the lower roller is fixed, and the upper roller can move towards or away from the lower roller;

[0028] In the case that the upper roller runs to a second running distance, the pressure of the pressure roller of the upper roller on the anode strip is decreased from an initial pressure value to a first pressure value, comprising:

[0029] In a case where the upper roller runs to the second strip distance, the upper roller is controlled to move away from the lower roller to reduce the pressure roller pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value.

[0030] In the embodiments of the present application, the pressure roller pressure of the upper roller on the anode strip is adjusted by adjusting the distance between the upper roller and the lower roller, which is simple in implementation and can save hardware cost.

[0031] In an embodiment of the present application, the lamination device further comprises a motor for driving the movement of the upper roller.

[0032] In a case where the upper roller runs to the second strip distance, the upper roller is controlled to move away from the lower roller to reduce the pressure roller pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value.

[0033] In a case where the upper roller runs to the second strip distance, the motor is controlled to rotate according to a first corresponding relationship, so that the upper roller moves away from the lower roller to reduce the pressure roller pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value, and the first corresponding relationship comprises a corresponding relationship between the rotation angle of the motor and the pressure roller pressure of the upper roller on the anode strip.

[0034] In the embodiments of the present application, the first corresponding relationship can be obtained by calibrating the corresponding relationship between the distance of the movement of the upper roller and the pressure roller pressure of the upper roller on the anode strip, and the rotation angle of the motor is adjusted according to the first corresponding relationship, so as to realize high-precision control of the pressure roller pressure applied to the anode strip.

[0035] In an embodiment of the present application, the lamination device further comprises first and second inclined iron sliding blocks that are engaged with each other, the first inclined iron sliding block is connected to the upper roller through a connecting mechanism, and the second inclined iron sliding block is connected to the motor.

[0036] The rotation of the motor drives the movement of the second inclined iron sliding block, the movement of the second inclined iron sliding block drives the movement of the first inclined iron sliding block, and the first inclined iron sliding block drives the upper roller to move away from the lower roller or drives the upper roller to move along the direction towards the lower roller.

[0037] In the embodiment of the present application, the first inclined iron slider drives the upper roller to move away from the lower roller to reduce the pressure roller pressure of the upper roller on the anode strip from an initial pressure value to a first pressure value, or the first inclined iron slider drives the upper roller to move towards the lower roller to increase the pressure roller pressure of the upper roller on the anode strip from the first pressure value to the initial pressure value, so that the initial pressure value is used for pressure rolling in the non-edge area of the cathode sheet, and the pressure roller pressure value is reduced in the edge area of the cathode sheet, which can meet the normal pressure rolling process of the cathode sheet, and avoid the problem of scratching the cathode sheet due to large pressure roller pressure in the edge of the cathode sheet.

[0038] In an embodiment of the present application, a pressure sensor is arranged on the upper roller, and the method further comprises:

[0039] The value of the pressure roller pressure of the upper roller on the anode strip is obtained through the pressure sensor.

[0040] In the embodiment of the present application, a pressure sensor is arranged on the upper roller, and the value of the pressure roller pressure of the upper roller on the anode strip is obtained through the pressure sensor, so that the calibration personnel can intuitively know the corresponding pressure roller pressure of the motor rotation angle during calibration, and the pressure sensor can be used to collect the pressure roller pressure in real time when monitoring whether the pressure roller pressure applied by the upper roller is abnormal, so as to facilitate the monitoring of the pressure roller pressure.

[0041] In a second aspect, the embodiment of the present application provides a pressure roller pressure control device applied to a laminating device, wherein the laminating device comprises an upper roller and a lower roller for pressure rolling of an anode strip, and a detection unit, wherein the upper roller and the lower roller are arranged oppositely, the anode strip is arranged between the upper roller and the lower roller, a plurality of cathode sheets are arranged on both sides of the anode strip in turn and staggeredly, the rotation direction of the upper roller and the lower roller matches the moving direction of the anode strip, the upper roller and the lower roller cooperate to pressure roll the cathode sheets on the anode strip, a plurality of cut holes are arranged on the anode strip, and one cathode sheet is included between two adjacent cut holes, and the detection unit is used for detecting the cut holes on the anode strip; the pressure roller pressure control device comprises:

[0042] A first adjusting module is configured to reduce the pressure roller pressure of the upper roller on the anode strip when the edge area of the cathode sheet is located at the pressure rolling position point of the anode strip by the upper roller, so that the pressure roller pressure of the upper roller on the anode strip is less than an initial pressure value;

[0043] The second adjusting module is configured to keep the pressure of the upper roller on the anode strip at the initial pressure value when the non-edge region of the cathode sheet is located at the pressure roller position point of the upper roller on the anode strip, the non-edge region of the cathode sheet being a region of the cathode sheet other than the edge region;

[0044] The first adjusting module comprises:

[0045] The first obtaining sub-module is configured to obtain a first running distance of the upper roller on the anode strip when the detection unit detects the cut hole on the anode strip.

[0046] The second obtaining sub-module is configured to obtain a first distance between the cut hole and the pressure roller position point of the upper roller on the anode strip.

[0047] The third obtaining sub-module is configured to obtain a second distance obtained by adding a preset distance to a distance from the cut hole to an adjacent cathode sheet.

[0048] The fourth obtaining sub-module is configured to obtain a target distance by subtracting the second distance from the first distance.

[0049] The fifth obtaining sub-module is configured to determine a second running distance according to a sum of the first running distance and the target distance.

[0050] The first adjusting sub-module is configured to decrease the pressure of the upper roller on the anode strip from the initial pressure value to a first pressure value when the upper roller runs to the second running distance, wherein the edge region of the cathode sheet is located at the pressure roller position point of the upper roller on the anode strip when the upper roller runs to the second running distance.

[0051] In the embodiments of the present application, the initial pressure value is used for the pressure roller in the non-edge region of the cathode sheet, and the pressure roller pressure value is decreased in the edge region of the cathode sheet, so that the problem of the edge of the cathode sheet being pressed and causing the edge of the cathode sheet to be pulled due to the large pressure roller pressure can be avoided while the normal pressure roller processing of the cathode sheet is met, thereby further reducing the loss rate of the cathode sheet and improving the quality of the cathode sheet.

[0052] In an embodiment of the present application, the first adjusting sub-module is specifically configured to gradually decrease the pressure of the upper roller on the anode strip when the upper roller runs to the second running distance, until the pressure of the upper roller on the anode strip is decreased to the first pressure value when the upper roller continues to run for the second distance.

[0053] In the embodiment of the present application, the pressure of the upper roller on the anode strip is gradually reduced from the initial pressure value to the first pressure value in the interval that the upper roller continues to run for the second distance, which can avoid the problem that the edge of the cathode sheet is pressed and the edge of the cathode sheet is pulled due to the large pressure of the pressure roller.

[0054] In an embodiment of the present application, the second adjusting module includes a second adjusting submodule, configured to increase the pressure of the upper roller on the anode strip from the first pressure value to the initial pressure value when the upper roller runs for a third running distance, so that the pressure of the upper roller on the anode strip is kept at the initial pressure value when the non-edge area of the cathode sheet is located at the pressure roller position point of the upper roller on the anode strip, and the third running distance is the sum of the second running distance and the second distance.

[0055] In the embodiment of the present application, the pressure of the upper roller on the anode strip is gradually increased from the first pressure value to the initial pressure value when the upper roller runs for the third running distance, so that the pressure of the upper roller on the anode strip is kept at the initial pressure value when the non-edge area of the cathode sheet is located at the pressure roller position point of the upper roller on the anode strip, to meet the normal pressure roller processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0056] In an embodiment of the present application, the second adjusting submodule is specifically configured to gradually increase the pressure of the upper roller on the anode strip when the upper roller runs for the third running distance, until the pressure of the upper roller on the anode strip is increased to the initial pressure value when the upper roller continues to run for the second distance.

[0057] In the embodiment of the present application, the pressure of the upper roller on the anode strip is gradually increased from the first pressure value to the initial pressure value when the upper roller runs for the third running distance, so that the pressure of the upper roller on the anode strip is kept at the initial pressure value when the non-edge area of the cathode sheet is located at the pressure roller position point of the upper roller on the anode strip, to meet the normal pressure roller processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0058] In an embodiment of the present application, the lower roller is fixed, and the upper roller can move along the direction towards or away from the lower roller.

[0059] The first adjusting submodule includes:

[0060] The first adjusting unit is configured to, in a case where the upper roller runs to the second strip distance, control the upper roller to move away from the lower roller to reduce the pressure of the upper roller on the anode strip from the initial pressure value to a first pressure value.

[0061] In the embodiments of the present application, the pressure of the upper roller on the anode strip is adjusted by adjusting the distance between the upper roller and the lower roller, which is simple to implement and can save hardware costs.

[0062] In an embodiment of the present application, the lamination device further comprises a motor for driving the movement of the upper roller.

[0063] The first adjusting unit is specifically configured to, in a case where the upper roller runs to the second strip distance, control the motor to rotate according to a first corresponding relationship, so that the upper roller moves away from the lower roller to reduce the pressure of the upper roller on the anode strip from the initial pressure value to a first pressure value. The first corresponding relationship includes a corresponding relationship between the rotation angle of the motor and the pressure of the upper roller on the anode strip.

[0064] In the embodiments of the present application, the first corresponding relationship can be obtained by calibrating the corresponding relationship between the distance of the movement of the upper roller and the pressure of the upper roller on the anode strip, and the rotation angle of the motor is adjusted according to the first corresponding relationship, so as to realize high-precision control of the pressure applied to the anode strip.

[0065] In an embodiment of the present application, the lamination device further comprises a first inclined iron sliding block and a second inclined iron sliding block that are engaged with each other. The first inclined iron sliding block is connected to the upper roller through a connecting mechanism, and the second inclined iron sliding block is connected to the motor.

[0066] The rotation of the motor drives the movement of the second inclined iron sliding block, the movement of the second inclined iron sliding block drives the movement of the first inclined iron sliding block, and the first inclined iron sliding block drives the upper roller to move away from the lower roller or drives the upper roller to move along the direction towards the lower roller.

[0067] In the embodiments of the present application, the first inclined iron sliding block drives the upper roller to move away from the lower roller to reduce the pressure of the upper roller on the anode strip from the initial pressure value to a first pressure value, or the first inclined iron sliding block drives the upper roller to move along the direction towards the lower roller to increase the pressure of the upper roller on the anode strip from the first pressure value to the initial pressure value. This realizes the use of the initial pressure value for pressure rolling in the non-edge area of the cathode sheet and the reduction of the pressure rolling pressure value in the edge area of the cathode sheet, which can meet the normal pressure rolling process of the cathode sheet while avoiding the problem of pressure injury of the cathode sheet due to large pressure rolling pressure in the edge of the cathode sheet, causing the wire drawing of the edge of the cathode sheet.

[0068] In an embodiment of the present application, the upper roller is provided with a pressure sensor, and the pressure roller pressure control device further comprises:

[0069] The acquisition module is configured to acquire, by the pressure sensor, a value of the pressure roller pressure of the upper roller on the anode material belt.

[0070] In an embodiment of the present application, the upper roller is provided with a pressure sensor, and the value of the pressure roller pressure of the upper roller on the anode material belt is acquired by the pressure sensor. During calibration, the calibration personnel can intuitively know the pressure roller pressure corresponding to the motor rotation angle. When monitoring whether the pressure roller pressure applied by the upper roller is abnormal, the pressure sensor can be used to collect the pressure roller pressure in real time, so as to facilitate monitoring of the pressure roller pressure.

[0071] In a third aspect, an embodiment of the present application provides a pressure roller pressure control system, comprising a laminated sheet device and a controller. The laminated sheet device comprises an upper roller and a lower roller for pressure rolling of an anode material belt, and a detection unit. The upper roller and the lower roller are oppositely arranged, the anode material belt is arranged between the upper roller and the lower roller, a plurality of cathode sheets are arranged on two surfaces of the anode material belt in sequence and staggered, the rotation direction of the upper roller and the lower roller matches the moving direction of the anode material belt, the upper roller and the lower roller cooperate to pressure roll the cathode sheets on the anode material belt, and the anode material belt is a composite belt comprising an upper separator, a lower separator and an anode sheet. The anode sheet is located between the upper separator and the lower separator. The anode material belt is provided with a plurality of cut holes. Each cut hole comprises one cathode sheet. The detection unit is configured to detect the cut holes on the anode material belt.

[0072] The controller is configured to, in a case where an edge region of the cathode sheet is located at a pressure roller position point of the upper roller on the anode material belt, reduce the pressure roller pressure of the upper roller on the anode material belt, so that the pressure roller pressure of the upper roller on the anode material belt is less than an initial pressure value.

[0073] In a case where a non-edge region of the cathode sheet is located at the pressure roller position point of the upper roller on the anode material belt, the pressure roller pressure of the upper roller on the anode material belt is maintained as the initial pressure value. The non-edge region of the cathode sheet is a region of the cathode sheet other than the edge region.

[0074] The controller is further configured to:

[0075] In a case where the detection unit detects the cut hole on the anode material belt, the controller is configured to acquire a first running distance of the upper roller.

[0076] The controller is further configured to acquire a first distance between the cut hole and the pressure roller position point of the upper roller on the anode material belt.

[0077] a second distance obtained by adding a preset distance to the distance from the hole to the adjacent cathode sheet;

[0078] a target distance obtained by subtracting the second distance from the first distance;

[0079] determining a second strip distance according to the sum of the first strip distance and the target distance;

[0080] decreasing the pressure of the upper roller on the anode strip from the initial pressure value to a first pressure value when the upper roller runs to the second strip distance, wherein the edge region of the cathode sheet is located at the pressure position of the upper roller on the anode strip when the upper roller runs to the second strip distance.

[0081] In the embodiments of the present application, the initial pressure value is used for the non-edge region of the cathode sheet, and the pressure value of the upper roller is decreased in the edge region of the cathode sheet, so that the edge of the cathode sheet is not pressed and the problem of the edge of the cathode sheet being pulled is avoided, thereby further reducing the loss rate of the cathode sheet and improving the quality of the cathode sheet.

[0082] In an embodiment of the present application, the controller is further configured to gradually decrease the pressure of the upper roller on the anode strip until the pressure of the upper roller on the anode strip is decreased to the first pressure value when the upper roller continues to run for the second distance.

[0083] In the embodiments of the present application, the pressure of the upper roller on the anode strip is gradually decreased from the initial pressure value to the first pressure value in the interval in which the upper roller continues to run for the second distance, so that the edge of the cathode sheet is not pressed and the problem of the edge of the cathode sheet being pulled is avoided.

[0084] In an embodiment of the present application, the controller is further configured to increase the pressure of the upper roller on the anode strip from the first pressure value to the initial pressure value when the upper roller runs to a third strip distance, so that the pressure of the upper roller on the anode strip is maintained at the initial pressure value when the non-edge region of the cathode sheet is located at the pressure position of the upper roller on the anode strip, and the third strip distance is the sum of the second strip distance and a second distance.

[0085] In the embodiment of the present application, in the case that the upper roller runs to the third strip running distance, the pressure of the upper roller on the anode strip is gradually increased from the first pressure value to the initial pressure value, so that in the case that the non-edge area of the cathode sheet is located at the pressure roller position point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is kept as the initial pressure value, so as to meet the normal pressure roller processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0086] In an embodiment of the present application, the controller is further configured to gradually increase the pressure of the upper roller on the anode strip in the case that the upper roller runs to the third strip running distance, until the pressure of the upper roller on the anode strip is increased to the initial pressure value in the case that the upper roller continues to run for a second distance.

[0087] In the embodiment of the present application, in the case that the upper roller runs to the third strip running distance, the pressure of the upper roller on the anode strip is gradually increased from the first pressure value to the initial pressure value, so that in the case that the non-edge area of the cathode sheet is located at the pressure roller position point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is kept as the initial pressure value, so as to meet the normal pressure roller processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0088] In an embodiment of the present application, the lower roller is fixed, and the upper roller is movable in the direction towards or away from the lower roller.

[0089] The controller is further configured to control the upper roller to move in the direction away from the lower roller in the case that the upper roller runs to the second strip running distance, so as to decrease the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value.

[0090] In the embodiment of the present application, the pressure of the upper roller on the anode strip is adjusted by adjusting the distance between the upper roller and the lower roller, which has a simple implementation and can save hardware cost.

[0091] In an embodiment of the present application, the laminating device further comprises a motor for driving the movement of the upper roller.

[0092] The controller is further configured to control the motor to rotate according to a first corresponding relationship in the case that the upper roller runs to the second strip running distance, so as to move the upper roller in the direction away from the lower roller, and decrease the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value, the first corresponding relationship comprising a corresponding relationship between the rotation angle of the motor and the pressure of the upper roller on the anode strip.

[0093] In the embodiments of the present application, the first corresponding relationship can be obtained by calibrating the corresponding relationship between the distance of the movement of the upper roller and the pressure roller pressure of the upper roller on the anode material belt, and the motor rotation angle is adjusted according to the first corresponding relationship, so as to realize high-precision control of the pressure roller pressure applied on the anode material belt.

[0094] In an embodiment of the present application, the lamination device further comprises a first inclined iron sliding block and a second inclined iron sliding block which are engaged with each other, the first inclined iron sliding block is connected with the upper roller through a connecting mechanism, and the second inclined iron sliding block is connected with the motor.

[0095] The motor drives the movement of the second inclined iron sliding block, the movement of the second inclined iron sliding block drives the movement of the first inclined iron sliding block, and the first inclined iron sliding block drives the movement of the upper roller in a direction away from the lower roller or in a direction towards the lower roller.

[0096] In the embodiments of the present application, the first inclined iron sliding block drives the movement of the upper roller in a direction away from the lower roller, so as to reduce the pressure roller pressure of the upper roller on the anode material belt from an initial pressure value to a first pressure value, or the first inclined iron sliding block drives the movement of the upper roller in a direction towards the lower roller, so as to increase the pressure roller pressure of the upper roller on the anode material belt from the first pressure value to the initial pressure value, so as to realize pressure roller processing on the non-edge area of the cathode sheet with the initial pressure value and reduce the pressure roller pressure value on the edge area of the cathode sheet, which can meet the normal pressure roller processing of the cathode sheet, and avoid the edge of the cathode sheet being pressed due to large pressure roller pressure, so as to cause the problem of wire drawing of the edge of the cathode sheet.

[0097] In an embodiment of the present application, a pressure sensor is arranged on the upper roller, and the controller is further configured to acquire the value of the pressure roller pressure of the upper roller on the anode material belt through the pressure sensor.

[0098] In the embodiments of the present application, the pressure sensor is arranged on the upper roller, and the value of the pressure roller pressure of the upper roller on the anode material belt is acquired through the pressure sensor, which can help the calibrating personnel to intuitively know the corresponding pressure roller pressure of the motor rotation angle during calibration, and the pressure sensor can be used to collect the pressure roller pressure in real time when monitoring whether the pressure roller pressure applied by the upper roller is abnormal, so as to facilitate the monitoring of the pressure roller pressure.

[0099] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0100] The features, advantages, and technical and artistic effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0101] Fig. 1 is a flowchart of a method for controlling pressure of a press roller according to an embodiment of the present application;

[0102] Fig. 2 is a schematic diagram of a partial structure of a lamination device according to an embodiment of the present application;

[0103] Fig. 3 is a schematic diagram of a partial structure of a lamination device according to an embodiment of the present application;

[0104] Fig. 4 is a schematic diagram of a relationship between a running distance of an upper roller and pressure of a press roller according to an embodiment of the present application;

[0105] Fig. 5 is a flowchart of a method for controlling pressure of a press roller according to an embodiment of the present application;

[0106] Fig. 6 is a schematic diagram of a structure of a press roller pressure control device according to an embodiment of the present application;

[0107] Fig. 7 is a schematic diagram of a structure of a press roller pressure control system according to an embodiment of the present application.

[0108] Detailed description of reference numerals: 1, anode strip; 2, upper roller; 3, lower roller; 4, cathode sheet; 5, press roller position point; 6, detection unit; 7, hole; 8, interval; 9, first inclined iron sliding block; 10, second inclined iron sliding block; 11, connecting mechanism; 12, pressure sensor; 41, first edge region; 42, second edge region; L, target distance; A, first distance; B, second distance; F, running direction of the strip. DETAILED DESCRIPTION

[0109] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0110] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as "comprise" and "have" and any variations such as "comprises" and "has" is intended to cover a non-exclusive inclusion; the use herein of terms such as "first", "second" and the like is intended to distinguish between similar objects and is not intended to designate a particular order or a particular priority.

[0111] In the production process of the power battery, the two surfaces of the anode material belt are covered with cathode sheets, which are the upper cathode sheet and the lower cathode sheet respectively. The anode material belt drives the upper cathode sheet and the lower cathode sheet to pass through the gap between the upper roller and the lower roller. Under the cooperation of the upper roller and the lower roller, the upper cathode sheet and the lower cathode sheet are subjected to roller pressing treatment, that is, the upper cathode sheet and the lower cathode sheet are pressed on the anode material belt. However, after the roller pressing treatment, if the roller pressing force is too large, the edge region of the cathode sheet is easy to be pressed and damaged, resulting in the phenomenon of wire drawing in the edge region of the cathode sheet.

[0112] Based on the above problems, the application provides a roller pressing force control method. On the one hand, when the non-edge region of the cathode sheet is located at the roller pressing position point of the upper roller on the anode material belt, the roller pressing force of the upper roller on the anode material belt is kept as an initial pressure value to satisfy the normal force roller pressing treatment of the cathode sheet and press the cathode sheet on the anode material belt.

[0113] On the other hand, when the edge region of the cathode sheet is located at the roller pressing position point of the upper roller on the anode material belt, the roller pressing force of the upper roller on the anode material belt is reduced to avoid the edge of the cathode sheet being pressed and damaged due to the large roller pressing force, thereby further reducing the loss rate of the cathode sheet and improving the quality of the cathode sheet.

[0114] The roller pressing force control method provided by the embodiments of the application will be introduced first in combination with the accompanying drawings.

[0115] Figure 1 is a flowchart of a pressure control method of a compression roller according to an embodiment of the present application, and Figure 2 shows a laminating device according to an embodiment of the present application. As shown in Figure 2, the laminating device includes an anode tape 1, an upper roller 2 and a lower roller 3. The upper roller and the lower roller are oppositely arranged, and the anode tape is arranged between the upper roller and the lower roller. A plurality of cathode sheets 4 are arranged on both sides of the anode tape in an alternating manner. The rotation direction of the upper roller and the lower roller matches the moving direction of the anode tape. For example, as shown in Figure 2, the upper roller 2 rotates clockwise, the lower roller 3 rotates counterclockwise, and the anode tape 1 moves from right to left. The upper roller 2 and the lower roller 3 cooperate to compress the cathode sheets 4 on the anode tape 1. For example, the position of the lower roller 3 is fixed, and the upper roller 2 moves upward relative to the lower roller 3 to increase the distance between the upper roller 2 and the lower roller 3, thereby reducing the force acting on the anode tape 1 by the upper roller 2 and the lower roller 3. Of course, the upper roller 2 can be fixed, and the lower roller 3 can move upward relative to the upper roller 2, which is not limited herein. It should be noted that the upper roller 2 and the lower roller 3 are relative concepts, and the "upper" and "lower" in the upper roller 2 and the lower roller 3 do not constitute a positional limitation. The upper roller 2 and the lower roller 3 can be vertically arranged, or can be horizontally arranged. The interval between adjacent cathode sheets 4 on the same side of the anode tape 1 can be the same, and the vertical projection of the cathode sheets 4 on different sides of the anode tape 1 on the anode tape 1 has an interval, and the interval can be the same.

[0116] The pressure control method of the compression roller provided by the present application is applied to a laminating device. As shown in Figure 1, the pressure control method of the compression roller provided by the present application includes the following steps 101-102.

[0117] In step 101, when the edge region of the cathode sheet is located at the compression position of the upper roller on the anode tape, the compression pressure of the upper roller on the anode tape is reduced, so that the compression pressure of the upper roller on the anode tape is less than the initial pressure value.

[0118] The anode tape can be a composite tape including an upper separator, a lower separator and an anode sheet, wherein the anode sheet is located between the upper separator and the lower separator.

[0119] The edge region of the cathode sheet can refer to the region where the edge of the cathode sheet is located, as shown in FIG. 2, both the edge region 41 and the edge region 42 of the cathode sheet 4 are edge regions of the cathode sheet 4, in order to distinguish the two edge regions of the cathode sheet 4, the first edge region 41 and the second edge region 42 are used for identification. The number 5 is the pressing roller position point of the upper roller 2 on the anode strip 1, in the case that the first edge region 41 or the second edge region 42 of the cathode sheet 4 is located at the pressing roller position point 5, the pressing roller pressure of the upper roller 2 on the anode strip 1 is reduced, for example, in the case that the lower roller 3 is fixed, the upper roller 2 is controlled to move away from the lower roller 3 to reduce the pressing roller pressure of the upper roller 2 on the anode strip 1, so that the pressing roller pressure of the upper roller 2 on the anode strip 1 is less than the initial pressure value.

[0120] Specifically, as shown in FIG. 3, the stack device further comprises a detection unit 6, a plurality of cut holes 7 are provided on the anode strip 1, and one cathode sheet 4 is included between adjacent two cut holes 7. The detection unit 6 is used for detecting the cut holes 7 on the anode strip 1, wherein the cathode sheet 4 included between adjacent two cut holes 7 can be located on any one side of the anode strip 1, and in FIG. 3, the two cathode sheets 4 adjacent to the cut holes 7 can be located on different sides of the anode strip 1. The cathode sheets 4 located on different sides of the anode strip 1 have a spacing 8 between the vertical projections of the cathode sheets 4 on the anode strip 1, and the cut holes 7 are located in the region where the spacing 8 of the anode strip 1 is located.

[0121] In the case that the edge region of the cathode sheet is located at the pressing roller position point of the upper roller on the anode strip, the pressing roller pressure of the upper roller on the anode strip is reduced, comprising the following steps:

[0122] In the case that the detection unit detects the cut hole on the anode strip, the first running distance of the upper roller is obtained;

[0123] The first distance between the cut hole and the pressing roller position point of the upper roller on the anode strip is obtained;

[0124] The second distance obtained by adding a preset distance to the distance from the cut hole to the adjacent cathode sheet is obtained;

[0125] The target distance is obtained by subtracting the second distance from the first distance;

[0126] The second running distance is determined according to the sum of the first running distance and the target distance.

[0127] It should be noted that the second distance can be slightly greater than the distance from the cutout to the adjacent cathode sheet, for example, the second distance is the distance from the cutout to the adjacent cathode sheet plus a preset distance, so that when adjusting the pressure roller pressure subsequently, the edge area of the cathode sheet (including the first edge area 41 and the second edge area 42) will reach the pressure roller position point before the adjustment starts, and when the edge area of the cathode sheet reaches the pressure roller position point, the pressure roller pressure has been adjusted to a smaller pressure value. Exemplarily, the preset distance can be greater than 0 and less than 20% of the length of the cathode sheet, which can be flexibly adjusted according to actual conditions, and is not limited here.

[0128] In the case where the upper roller runs to the second running distance, the pressure roller pressure of the upper roller on the anode tape is reduced from the initial pressure value to the first pressure value, wherein in the case where the upper roller runs to the second running distance, the edge area of the cathode sheet is located at the pressure roller position point of the upper roller on the anode tape.

[0129] In the above, as shown in FIG. 3, the target distance L is the first distance A minus the second distance B, and the second running distance L1 is the first running distance M plus the target distance L. In the case where the detection unit 6 detects the cutout 7 on the anode tape 1, the current distance that the upper roller 2 has run is the first running distance M. The upper roller 2 continues to rotate, and the anode tape 1 also moves with the cathode sheet 4. When the upper roller 2 runs L again, i.e., the upper roller 2 runs to the second running distance L1, the second edge area 42 of the cathode sheet 4 is located at the pressure roller position point 5 of the upper roller 2 on the anode tape. At this time, the pressure roller pressure of the upper roller 2 on the anode tape 1 is triggered to be reduced from the initial pressure value to the first pressure value.

[0130] In the embodiment, in the case where the edge area of the cathode sheet is located at the pressure roller position point of the upper roller on the anode tape, the pressure roller pressure of the upper roller on the anode tape is triggered to be reduced from the initial pressure value to the first pressure value, so as to reduce the pressure roller pressure of the upper roller on the anode tape, avoid the edge of the cathode sheet being pressed and causing the problem of wire drawing at the edge of the cathode sheet due to large pressure roller pressure.

[0131] In step 102, in the case where the non-edge area of the cathode sheet is located at the pressure roller position point of the upper roller on the anode tape, the pressure roller pressure of the upper roller on the anode tape is maintained at the initial pressure value, and the non-edge area of the cathode sheet is an area of the cathode sheet other than the edge area.

[0132] In the case that the non-edge area of the cathode sheet 4 is located at the pressing roller position point 5 of the upper roller, the cathode sheet 4 can be normally pressed, for example, the upper roller normally presses the cathode sheet 4 with the initial pressing force value, in which case, the pressing force of the upper roller on the anode strip is kept at the initial pressing force value. For example, in the case that the position of the lower roller is fixed, the upper roller is controlled to move away from the lower roller to reduce the pressing force of the upper roller on the anode strip, so that after the pressing force of the upper roller on the anode strip is less than the initial pressing force value, the upper roller is controlled to move towards the lower roller again to restore the initial position of the upper roller, so that the pressing force of the upper roller on the anode strip is the initial pressing force value.

[0133] In the embodiment, in the case that the edge area of the cathode sheet is located at the pressing roller position point of the upper roller on the anode strip, the pressing force of the upper roller on the anode strip is reduced to be less than the initial pressing force value; in the case that the non-edge area of the cathode sheet is located at the pressing roller position point of the upper roller on the anode strip, the pressing force of the upper roller on the anode strip is kept at the initial pressing force value, the non-edge area of the cathode sheet is the area of the cathode sheet other than the edge area. In this way, the non-edge area of the cathode sheet is pressed with the initial pressing force value, and the edge area of the cathode sheet is pressed with a reduced pressing force value, which can meet the normal pressing process of the cathode sheet, avoid the edge of the cathode sheet being pressed too hard and causing the edge of the cathode sheet to be pulled, thereby further reducing the loss rate of the cathode sheet and improving the quality of the cathode sheet.

[0134] In the case that the upper roller runs to the second strip distance, the pressing force of the upper roller on the anode strip is reduced from the initial pressing force value to the first pressing force value, which includes:

[0135] In the case that the upper roller runs to the second strip distance, the pressing force of the upper roller on the anode strip is gradually reduced until the upper roller continues to run for the second distance, and the pressing force of the upper roller on the anode strip is reduced to the first pressing force value.

[0136] Specifically, the gradual reduction of the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value can be achieved by gradually reducing the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value. The process of reducing the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value requires a very small period of time, during which the upper roller 2 continues to rotate and the anode strip 1 also continues to move. When the pressure of the upper roller on the anode strip is reduced to the first pressure value, the upper roller 2 continues to run for a second distance. For example, the pressure of the upper roller on the anode strip is reduced from the initial pressure value of 300 MPa to 50 MPa within 1 mm (the second distance is 1 mm) of the upper roller running, as shown in the curve in FIG. 4, where the abscissa represents the running distance of the upper roller (the distance is a relative distance), and the ordinate represents the pressure of the upper roller. As can be seen from FIG. 4, the initial pressure value is 300 MPa, and the pressure of the upper roller is reduced from the initial pressure value of 300 MPa to 50 MPa within 1 mm (the second distance is 1 mm) of the upper roller running.

[0137] In the embodiment, the gradual reduction of the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value within the range of the upper roller running for the second distance can avoid the problem of the edges of the cathode sheet being pressed and causing the edges of the cathode sheet to be pulled due to the large pressure of the upper roller on the anode strip.

[0138] In another embodiment of the present application, when the non-edge region of the cathode sheet is located at the pressure roller position point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is maintained at the initial pressure value, comprising:

[0139] When the upper roller runs to a third running distance, the pressure of the upper roller on the anode strip is increased from the first pressure value to the initial pressure value, so that when the non-edge region of the cathode sheet is located at the pressure roller position point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is maintained at the initial pressure value, and the third running distance is the sum of the second running distance and the second distance.

[0140] For the sake of clear description, the lower roller and other components are not shown in FIG. 3. As shown in FIG. 3, the third running distance L2 is the sum of the second running distance L1 and the second distance B. When the upper roller 2 runs to the third running distance L2, the hole 7 of the anode strip 1 is located at the pressure roller position point 5. At this time, the pressure of the upper roller 2 on the anode strip 1 is increased. Since the increase in the pressure of the upper roller on the anode strip requires a period of time, during which the upper roller 2 continues to rotate and the anode strip 1 also continues to move, within the period of time during which the pressure of the upper roller on the anode strip is increased from the first pressure value to the initial pressure value, the first edge region 41 of the cathode sheet 4 located behind the hole 7 moves to the pressure roller position point 5. The upper roller 2 continues to rotate, and the anode strip 1 continues to move. After the pressure of the upper roller on the anode strip is restored to the initial pressure value, the non-edge region of the cathode sheet 4 is located at the pressure roller position point 5 of the upper roller 2, so that the pressure of the upper roller 2 on the non-edge region of the cathode sheet 4 is the initial pressure value.

[0141] In the embodiment, in the case that the upper roller runs to the third strip distance, the pressure of the upper roller on the anode strip is increased from the first pressure value to the initial pressure value, so that in the case that the non-edge area of the cathode sheet is located at the pressure position point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is kept as the initial pressure value, so as to meet the normal pressure processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0142] In the embodiment, in the case that the upper roller runs to the third strip distance, the pressure of the upper roller on the anode strip is increased from the first pressure value to the initial pressure value, so that in the case that the non-edge area of the cathode sheet is located at the pressure position point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is kept as the initial pressure value, so as to meet the normal pressure processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0143] In the case that the upper roller runs to the third strip distance, the pressure of the upper roller on the anode strip is gradually increased until the pressure of the upper roller on the anode strip is increased to the initial pressure value in the case that the upper roller continues to run for the second distance.

[0144] Specifically, the pressure of the upper roller on the anode strip is gradually increased from the first pressure value to the initial pressure value. The process of increasing the pressure of the upper roller on the anode strip from the first pressure value to the initial pressure value needs a very small time period, and in this time period, the upper roller continues to rotate and the anode strip also continues to move. When the pressure is increased to the initial pressure value, the upper roller continues to run for the second distance. For example, the curve shown in FIG. 4 is used to control the decreasing process of the pressure, the horizontal axis in FIG. 4 is the distance that the upper roller 2 continues to run, and the vertical axis is the pressure. As shown in FIG. 4, the first pressure value is 50 Mpa, and the initial pressure value is 300 Mpa. In the case that the upper roller runs to the third strip distance, the pressure is gradually increased, and in the range that the upper roller continues to run for 1 mm (the second distance is 1 mm), the pressure is increased from the first pressure value 50 Mpa to the initial pressure value 300 Mpa. After the pressure is increased to the initial pressure value, the non-edge area of the cathode sheet also moves to the pressure position point. In this case, the initial pressure value can be used to process the non-edge area of the cathode sheet.

[0145] In the embodiment, in the case that the upper roller runs to the third strip distance, the pressure of the upper roller on the anode strip is increased from the first pressure value to the initial pressure value, so that in the case that the non-edge area of the cathode sheet is located at the pressure position point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is kept as the initial pressure value, so as to meet the normal pressure processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0146] In another embodiment of the present application, the lower roller is fixed, and the upper roller is movable in a direction towards or away from the lower roller;

[0147] In the case where the upper roller runs to the second running distance, the pressure of the upper roller on the anode strip is reduced from the initial pressure value to the first pressure value, comprising:

[0148] In the case where the upper roller runs to the second running distance, the upper roller is controlled to move in a direction away from the lower roller to reduce the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value.

[0149] In the present embodiment, the pressure of the upper roller on the anode strip is adjusted by adjusting the distance between the upper roller and the lower roller, which is simple in implementation and can save hardware cost.

[0150] Exemplarily, the lamination device further comprises a motor driving the movement of the upper roller;

[0151] In the case where the upper roller runs to the second running distance, the upper roller is controlled to move in a direction away from the lower roller, comprising:

[0152] In the case where the upper roller runs to the second running distance, the motor is controlled to rotate according to a first corresponding relationship, so that the upper roller moves in a direction away from the lower roller to reduce the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value, the first corresponding relationship comprising a corresponding relationship between the rotation angle of the motor and the pressure of the upper roller on the anode strip.

[0153] Specifically, the upper roller is controlled to move by the motor to adjust the pressure of the upper roller on the anode strip by adjusting the distance between the upper roller and the lower roller, and the first corresponding relationship can be determined in a pre-calibration manner, as shown in FIG. 2, the upper roller 2 is provided with a pressure sensor 12, the value of the pressure of the upper roller 2 on the anode strip 1 is obtained by the pressure sensor 12, so as to determine whether the motor needs to drive the upper roller 2 to move up or down to adjust the value of the pressure, to realize closed-loop feedback control. In addition, during calibration, the calibration personnel can intuitively know the corresponding pressure of the motor rotation angle, and when monitoring whether the pressure of the upper roller is abnormal, the pressure sensor 12 can also be used to collect the pressure in real time, so as to facilitate the monitoring of the pressure.

[0154] In the present embodiment, the first corresponding relationship is obtained by calibrating the corresponding relationship between the distance of the movement of the upper roller and the pressure of the upper roller on the anode strip, and the rotation angle of the motor is adjusted according to the first corresponding relationship, so as to realize high-precision control of the pressure applied to the anode strip.

[0155] Exemplarily, as shown in FIG. 2, the lamination device further comprises a first cam slide 9 and a second cam slide 10 which are engaged with each other, the first cam slide 9 is connected with the upper roller 2 through a connecting mechanism 11, and the second cam slide 10 is connected with the motor (not shown in FIG. 2);

[0156] The motor rotates to drive the second cam slide 10 to move, the second cam slide 10 drives the first cam slide 9 to move, and the first cam slide 9 drives the upper roller 2 to move away from the lower roller 3, so as to reduce the pressure roller pressure of the upper roller 2 on the anode strip 1 from an initial pressure value to a first pressure value, or the first cam slide 9 drives the upper roller 2 to move along the direction towards the lower roller 3, so as to increase the pressure roller pressure of the upper roller 2 on the anode strip 1 from the first pressure value to the initial pressure value, so as to realize that the initial pressure value is adopted for pressure roller in the non-edge area of the cathode sheet, and the pressure roller pressure value is reduced in the edge area of the cathode sheet, which can meet the normal pressure roller processing of the cathode sheet, and avoid that the edge of the cathode sheet is pressed due to large pressure roller pressure, so as to cause the problem of wire drawing of the edge of the cathode sheet.

[0157] The pressure roller pressure control method provided by the present application is illustrated as follows. Please refer to FIG. 5, which is a flowchart of the pressure roller pressure control method provided by the embodiment of the present application, as shown in FIG. 5, the method comprises the following steps:

[0158] In step 501, when the hole cutting sensor (i.e. the detection unit) senses the hole cutting position, the current position M of the upper roller is latched (i.e. the first walking distance M of the upper roller is acquired);

[0159] In step 502, the trigger position (i.e. the second walking distance L1, L1 is L+M) is calculated according to the distance (L+B as shown in FIG. 3) between the hole cutting sensor and the pressure roller position point and the first walking distance M;

[0160] In step 503, when the upper roller runs to the position of the second walking distance L1, the motor is triggered to drive the upper roller to move upwards according to the corresponding relationship shown in FIG. 4, so as to reduce the pressure roller pressure;

[0161] In step 504, the hole cutting follows the anode strip to run, when the upper roller runs to the third walking distance (the distance from the pressure roller position point exceeds L1), the motor is triggered to drive the upper roller to move downwards according to the corresponding relationship shown in FIG. 4, the motor quickly returns to the standby position, the pressure roller is pressed down, the pressure roller pressure is increased, the flowchart is ended, and the next cycle is prepared.

[0162] Through the above process, the edge area of the cathode sheet is lifted, which can effectively avoid the phenomenon of pressing and wire drawing of the edge of the cathode sheet, and compared with the cylinder control, the high-speed linear motor control can be adopted, the response time is faster, which can be improved from 30 ms to less than 10 ms.

[0163] Please refer to Figure 6, which is a structural schematic diagram of the pressure roller pressure control device provided by the embodiment of the application. As shown in Figure 6, the pressure roller pressure control device 600 comprises:

[0164] The pressure roller pressure control device is applied to a lamination device, the lamination device comprises an upper roller and a lower roller for pressing a positive electrode material belt, and a detection unit, wherein the upper roller and the lower roller are oppositely arranged, the positive electrode material belt is arranged between the upper roller and the lower roller, a plurality of negative electrode sheets are arranged on two surfaces of the positive electrode material belt in sequence and staggered, the rotating direction of the upper roller and the lower roller matches the moving direction of the positive electrode material belt, the upper roller and the lower roller cooperate to press the negative electrode sheets on the positive electrode material belt, a plurality of cut holes are arranged on the positive electrode material belt, and one negative electrode sheet is included between two adjacent cut holes, the detection unit is used for detecting the cut holes on the positive electrode material belt, and the pressure roller pressure control device comprises:

[0165] A first adjusting module 601 is configured to reduce the pressing pressure of the upper roller on the positive electrode material belt when the edge region of the negative electrode sheet is located at the pressing position point of the upper roller on the positive electrode material belt, so that the pressing pressure of the upper roller on the positive electrode material belt is less than an initial pressure value.

[0166] A second adjusting module 602 is configured to keep the pressing pressure of the upper roller on the positive electrode material belt as the initial pressure value when the non-edge region of the negative electrode sheet is located at the pressing position point of the upper roller on the positive electrode material belt, the non-edge region of the negative electrode sheet being a region of the negative electrode sheet other than the edge region.

[0167] The first adjusting module 601 comprises:

[0168] A first obtaining sub-module is configured to obtain a first running distance of the upper roller on the positive electrode material belt when the detection unit detects the cut hole on the positive electrode material belt.

[0169] A second obtaining sub-module is configured to obtain a first distance between the cut hole and the pressing position point of the upper roller on the positive electrode material belt.

[0170] A third obtaining sub-module is configured to obtain a second distance obtained by adding a preset distance to the distance from the cut hole to the adjacent negative electrode sheet.

[0171] A fourth obtaining sub-module is configured to obtain a target distance by subtracting the second distance from the first distance.

[0172] A fifth obtaining sub-module is configured to determine a second running distance according to the sum of the first running distance and the target distance.

[0173] The first adjusting sub-module is configured to, in a case where the upper roller runs to a second running distance, decrease the pressure of the upper roller on the anode strip from an initial pressure value to a first pressure value, wherein, in the case where the upper roller runs to the second running distance, the edge region of the cathode sheet is located at the pressure position point of the upper roller on the anode strip.

[0174] In the embodiments of the present application, by the above manner, the initial pressure value is used for the pressure on the non-edge region of the cathode sheet, and the pressure value is decreased on the edge region of the cathode sheet, so that the problem of the edge of the cathode sheet being pressed and the cathode sheet being damaged due to the large pressure of the pressure roller can be avoided, and the problem of the edge of the cathode sheet being pulled due to the large pressure of the pressure roller can be avoided, thereby further reducing the loss rate of the cathode sheet and improving the quality of the cathode sheet. Specifically, in a case where the edge region of the cathode sheet is located at the pressure position point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is decreased from the initial pressure value to the first pressure value, so that the pressure of the upper roller on the anode strip is decreased, and the problem of the edge of the cathode sheet being pressed and the cathode sheet being damaged due to the large pressure of the pressure roller can be avoided.

[0175] In an embodiment of the present application, the first adjusting sub-module is specifically configured to, in a case where the upper roller runs to a second running distance, gradually decrease the pressure of the upper roller on the anode strip until, in a case where the upper roller continues to run for a second distance, the pressure of the upper roller on the anode strip is decreased to the first pressure value.

[0176] In the embodiments of the present application, the pressure of the upper roller on the anode strip is gradually decreased from the initial pressure value to the first pressure value within the interval in which the upper roller continues to run for a second distance, so that the problem of the edge of the cathode sheet being pressed and the cathode sheet being damaged due to the large pressure of the pressure roller can be avoided, and the problem of the edge of the cathode sheet being pulled can be avoided.

[0177] In an embodiment of the present application, the second adjusting module 602 includes a second adjusting sub-module configured to, in a case where the upper roller runs to a third running distance, increase the pressure of the upper roller on the anode strip from the first pressure value to the initial pressure value, so that, in a case where the non-edge region of the cathode sheet is located at the pressure position point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is maintained as the initial pressure value, and the third running distance is the sum of the second running distance and a second distance.

[0178] In the embodiment of the present application, in the case that the upper roller runs to the third strip distance, the pressure of the upper roller on the anode strip is gradually increased from the first pressure value to the initial pressure value, so that in the case that the non-edge area of the cathode sheet is located at the pressure position point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is kept as the initial pressure value, so as to meet the normal pressure processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0179] In an embodiment of the present application, the second adjusting sub-module is specifically configured to gradually increase the pressure of the upper roller on the anode strip in the case that the upper roller runs to the third strip distance, until the pressure of the upper roller on the anode strip is increased to the initial pressure value in the case that the upper roller continues to run for a second distance.

[0180] In the embodiment of the present application, in the case that the upper roller runs to the third strip distance, the pressure of the upper roller on the anode strip is gradually increased from the first pressure value to the initial pressure value, so that in the case that the non-edge area of the cathode sheet is located at the pressure position point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is kept as the initial pressure value, so as to meet the normal pressure processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0181] In an embodiment of the present application, the lower roller is fixed, and the upper roller is movable in the direction towards or away from the lower roller;

[0182] The first adjusting sub-module comprises:

[0183] The first adjusting unit is configured to control the upper roller to move away from the lower roller in the case that the upper roller runs to the second strip distance, so as to decrease the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value.

[0184] In the embodiment of the present application, the pressure of the upper roller on the anode strip is adjusted by adjusting the distance between the upper roller and the lower roller, which has a simple implementation and can save hardware cost.

[0185] In an embodiment of the present application, the laminating device further comprises a motor for driving the movement of the upper roller;

[0186] The first adjusting unit is specifically configured to control the motor to rotate according to a first corresponding relationship in the case that the upper roller runs to the second strip distance, so as to move the upper roller away from the lower roller, and decrease the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value, the first corresponding relationship comprising a corresponding relationship between the rotation angle of the motor and the pressure of the upper roller on the anode strip.

[0187] In the embodiment of the present application, the first corresponding relationship can be obtained by calibrating the corresponding relationship between the distance of the movement of the upper roller and the pressure of the pressure roller on the anode strip, and the motor rotation angle is adjusted according to the first corresponding relationship, so as to realize high-precision control of the pressure of the pressure roller on the anode strip.

[0188] In an embodiment of the present application, the lamination device further comprises a first inclined iron sliding block and a second inclined iron sliding block which are engaged with each other, the first inclined iron sliding block is connected with the upper roller through a connecting mechanism, and the second inclined iron sliding block is connected with the motor.

[0189] The motor drives the movement of the second inclined iron sliding block, the movement of the second inclined iron sliding block drives the movement of the first inclined iron sliding block, and the first inclined iron sliding block drives the movement of the upper roller away from the lower roller or along the direction towards the lower roller.

[0190] In the embodiment of the present application, the first inclined iron sliding block drives the movement of the upper roller away from the lower roller to reduce the pressure of the pressure roller on the anode strip from an initial pressure value to a first pressure value, or the first inclined iron sliding block drives the movement of the upper roller towards the lower roller to increase the pressure of the pressure roller on the anode strip from the first pressure value to the initial pressure value, so as to realize the pressure of the pressure roller on the non-edge area of the cathode sheet with the initial pressure value and the reduced pressure value on the edge area of the cathode sheet. Thus, the normal pressure processing of the cathode sheet can be met, and the edge of the cathode sheet is prevented from being pressed and causing the problem of wire drawing on the edge of the cathode sheet due to the large pressure of the pressure roller.

[0191] In an embodiment of the present application, a pressure sensor is arranged on the upper roller, and the pressure roller pressure control device further comprises:

[0192] The acquisition module is configured to acquire the value of the pressure of the pressure roller on the anode strip through the pressure sensor.

[0193] In the embodiment of the present application, the pressure sensor is arranged on the upper roller, and the value of the pressure of the pressure roller on the anode strip is acquired through the pressure sensor. During the calibration, the calibrating personnel can intuitively know the corresponding pressure of the motor rotation angle, and when monitoring whether the pressure of the pressure roller applied by the upper roller is abnormal, the pressure sensor can be used to collect the pressure of the pressure roller in real time, so as to monitor the pressure of the pressure roller.

[0194] Figure 7 shows a pressure roller pressure control system provided by an embodiment of the present application. As shown in Figure 7, the pressure roller pressure control system 700 includes a laminated sheet device 701 and a controller 702. The laminated sheet device 701 includes an upper roller and a lower roller for pressing an anode strip, and a detection unit. The upper roller and the lower roller are oppositely arranged, and the anode strip is arranged between the upper roller and the lower roller. A plurality of cathode sheets are arranged on both sides of the anode strip in a staggered manner. The rotation direction of the upper roller and the lower roller matches the moving direction of the anode strip. The upper roller and the lower roller cooperate to press the cathode sheets on the anode strip. The anode strip is provided with a plurality of cut holes. Each cut hole includes one cathode sheet. The detection unit is configured to detect the cut holes on the anode strip.

[0195] The controller 702 is configured to, when the edge region of the cathode sheet is located at the pressing position of the upper roller on the anode strip, reduce the pressing pressure of the upper roller on the anode strip, so that the pressing pressure of the upper roller on the anode strip is less than the initial pressing value.

[0196] When the non-edge region of the cathode sheet is located at the pressing position of the upper roller on the anode strip, the pressing pressure of the upper roller on the anode strip is maintained at the initial pressing value. The non-edge region of the cathode sheet is a region other than the edge region of the cathode sheet.

[0197] The controller 702 is further configured to:

[0198] When the detection unit detects the cut hole on the anode strip, the controller 702 is configured to acquire a first strip running distance of the upper roller that has been run.

[0199] The controller 702 is configured to acquire a first distance between the cut hole and the pressing position of the upper roller on the anode strip.

[0200] The controller 702 is configured to acquire a second distance obtained by adding a preset distance to the distance from the cut hole to the adjacent cathode sheet.

[0201] The controller 702 is configured to subtract the second distance from the first distance to obtain a target distance.

[0202] The controller 702 is configured to determine a second strip running distance according to the sum of the first strip running distance and the target distance.

[0203] When the upper roller runs to the second strip running distance, the controller 702 is configured to reduce the pressing pressure of the upper roller on the anode strip from the initial pressing value to a first pressing value. When the upper roller runs to the second strip running distance, the edge region of the cathode sheet is located at the pressing position of the upper roller on the anode strip.

[0204] In the embodiments of the present application, by the above manner, the initial pressure value is used for the roller pressing in the non-edge area of the cathode sheet, and the roller pressing pressure value is reduced in the edge area of the cathode sheet, so that the problem of the edge of the cathode sheet being pressed and causing the edge of the cathode sheet to be drawn due to the large roller pressing pressure can be avoided while the normal roller pressing process of the cathode sheet is met, thereby further reducing the loss rate of the cathode sheet and improving the quality of the cathode sheet. Specifically, in a case where it is detected that the edge area of the cathode sheet is located at the roller pressing position point of the upper roller on the anode strip, the roller pressing pressure of the upper roller on the anode strip is reduced from the initial pressure value to the first pressure value, so that the roller pressing pressure of the upper roller on the anode strip is reduced, and the problem of the edge of the cathode sheet being pressed and causing the edge of the cathode sheet to be drawn due to the large roller pressing pressure is avoided.

[0205] In an embodiment of the present application, the controller 702 is further configured to gradually reduce the roller pressing pressure of the upper roller on the anode strip in a case where the upper roller runs to the second running distance, until the roller pressing pressure of the upper roller on the anode strip is reduced to the first pressure value in a case where the upper roller continues to run for the second distance.

[0206] In the embodiments of the present application, the roller pressing pressure of the upper roller on the anode strip is gradually reduced from the initial pressure value to the first pressure value in the interval in which the upper roller continues to run for the second distance, so that the problem of the edge of the cathode sheet being pressed and causing the edge of the cathode sheet to be drawn due to the large roller pressing pressure can be avoided.

[0207] In an embodiment of the present application, the controller 702 is further configured to increase the roller pressing pressure of the upper roller on the anode strip from the first pressure value to the initial pressure value in a case where the upper roller runs to a third running distance, so that the roller pressing pressure of the upper roller on the anode strip is maintained as the initial pressure value in a case where the non-edge area of the cathode sheet is located at the roller pressing position point of the upper roller on the anode strip, and the third running distance is the sum of the second running distance and the second distance.

[0208] In the embodiments of the present application, the roller pressing pressure of the upper roller on the anode strip is increased from the first pressure value to the initial pressure value in a case where the upper roller runs to the third running distance, so that the roller pressing pressure of the upper roller on the anode strip is maintained as the initial pressure value in a case where the non-edge area of the cathode sheet is located at the roller pressing position point of the upper roller on the anode strip, so as to meet the normal roller pressing process of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0209] In an embodiment of the present application, the controller 702 is further configured to gradually increase the pressure of the upper roller on the anode strip when the upper roller runs to a third strip distance, until the pressure of the upper roller on the anode strip increases to the initial pressure value when the upper roller continues to run for a second distance.

[0210] In an embodiment of the present application, the pressure of the upper roller on the anode strip is gradually increased from the first pressure value to the initial pressure value when the upper roller runs to a third strip distance, so that the pressure of the upper roller on the anode strip is maintained at the initial pressure value when the non-edge area of the cathode sheet is located at the pressure position of the upper roller on the anode strip, to meet the normal pressure processing of the cathode sheet, meet the process requirements of the cathode sheet, and improve the quality of the cathode sheet.

[0211] In an embodiment of the present application, the lower roller is fixed, and the upper roller is movable in a direction towards or away from the lower roller.

[0212] The controller 702 is further configured to control the upper roller to move away from the lower roller when the upper roller runs to a second strip distance, to reduce the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value.

[0213] In an embodiment of the present application, the distance between the upper roller and the lower roller is adjusted to adjust the pressure of the upper roller on the anode strip, which is simple to implement and can save hardware costs.

[0214] In an embodiment of the present application, the laminating device 701 further comprises a motor for moving the upper roller.

[0215] The controller 702 is further configured to control the motor to rotate according to a first corresponding relationship when the upper roller runs to a second strip distance, so that the upper roller moves away from the lower roller, to reduce the pressure of the upper roller on the anode strip from the initial pressure value to the first pressure value, the first corresponding relationship comprising a corresponding relationship between the rotation angle of the motor and the pressure of the upper roller on the anode strip.

[0216] In an embodiment of the present application, the first corresponding relationship can be obtained by calibrating the corresponding relationship between the distance of the upper roller movement and the pressure of the upper roller on the anode strip, and the rotation angle of the motor is adjusted according to the first corresponding relationship, so as to realize high-precision control of the pressure of the upper roller on the anode strip.

[0217] In an embodiment of the present application, the laminating device 701 further comprises a first inclined iron sliding block and a second inclined iron sliding block which are engaged with each other, the first inclined iron sliding block is connected with the upper roller through a connecting mechanism, and the second inclined iron sliding block is connected with the motor.

[0218] The motor rotates to drive the second inclined iron sliding block to move, the second inclined iron sliding block drives the first inclined iron sliding block to move, and the first inclined iron sliding block drives the upper roller to move away from the lower roller or drives the upper roller to move towards the lower roller.

[0219] In an embodiment of the present application, the first inclined iron sliding block drives the upper roller to move away from the lower roller to reduce the pressure of the upper roller on the anode strip from an initial pressure value to a first pressure value, or the first inclined iron sliding block drives the upper roller to move towards the lower roller to increase the pressure of the upper roller on the anode strip from the first pressure value to the initial pressure value, so that the initial pressure value is used for pressure rolling in the non-edge area of the cathode sheet, and the pressure value is reduced in the edge area of the cathode sheet, which can meet the normal pressure rolling process of the cathode sheet, and avoid the edge of the cathode sheet being pressed due to large pressure, thereby preventing the problem of wire drawing in the edge of the cathode sheet.

[0220] In an embodiment of the present application, a pressure sensor is arranged on the upper roller, and the controller 702 is further configured to acquire the pressure value of the upper roller on the anode strip through the pressure sensor.

[0221] In an embodiment of the present application, a pressure sensor is arranged on the upper roller, and the pressure value of the upper roller on the anode strip is acquired through the pressure sensor, so that the pressure sensor can be used to acquire the pressure value corresponding to the rotation angle of the motor during calibration, and the pressure sensor can be used to acquire the pressure value in real time when monitoring whether the pressure value applied by the upper roller is abnormal, thereby facilitating the monitoring of the pressure value.

[0222] It should be noted that the specific structure and working principle of the laminating device 701 can be shown in FIGS. 2 and 3, and refer to the foregoing description, which will not be described here.

[0223] It should be noted that the present application is not limited to the specific configurations and processes described above and shown in the drawings. For the sake of brevity, detailed descriptions of known methods are omitted herein. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order of the steps, after understanding the spirit of the present application.

[0224] The functional blocks shown in the structural block diagrams above can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, and the like. When implemented in software, the elements of the present application are program or code segments that are used to perform the required tasks. The program or code segments can be stored in a machine-readable medium, or transmitted through a data signal carried in a carrier wave over a transmission medium or communication link. A "machine-readable medium" includes any medium that can store or transport information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like. The code segments can be downloaded via computer networks such as the Internet, intranets, and the like.

[0225] It is also important to note that the examples mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the examples, or in an order different from the examples, or several steps can be performed simultaneously.

[0226] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks. These computer program instructions can also be stored in a computer readable medium that can direct a computer, other programmable data processing apparatus, or other devices to operate in a particular manner, such that the instructions stored in the computer readable medium produce an article of manufacture including instructions which implement the function / act specified in the flowchart and / or block diagram block or blocks.

[0227] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method of controlling pressure of a press roll applied to a lamination device, the lamination device including an upper roll and a lower roll that press a roll of anode material, and a detection unit, wherein, The upper roller and the lower roller are oppositely arranged, the anode strip is arranged between the upper roller and the lower roller, a plurality of cathode sheets are arranged on two surfaces of the anode strip in sequence and staggered, the rotating direction of the upper roller and the lower roller matches the moving direction of the anode strip, the upper roller and the lower roller cooperate to press the cathode sheets on the anode strip, a plurality of cut holes are arranged on the anode strip, and one cathode sheet is arranged between two adjacent cut holes, and the detection unit is used for detecting the cut holes on the anode strip. The method comprises: In a case where the edge region of the cathode sheet is located at the pressing position point of the upper roller on the anode strip, the pressing force of the upper roller on the anode strip is reduced, so that the pressing force of the upper roller on the anode strip is less than the initial pressing force value; In a case where the non-edge region of the cathode sheet is located at the pressing position point of the upper roller on the anode strip, the pressing force of the upper roller on the anode strip is kept as the initial pressing force value, and the non-edge region of the cathode sheet is a region of the cathode sheet other than the edge region; In a case where the edge region of the cathode sheet is located at the pressing position point of the upper roller on the anode strip, the pressing force of the upper roller on the anode strip is reduced, comprising: In a case where the detection unit detects the cut hole on the anode strip, a first running distance of the upper roller is obtained; A first distance between the cut hole and the pressing position point of the upper roller on the anode strip is obtained; A second distance obtained by adding a preset distance to the distance from the cut hole to the adjacent cathode sheet is obtained; The first distance is subtracted from the second distance to obtain a target distance; A second running distance is determined according to the sum of the first running distance and the target distance; In a case where the upper roller runs to the second running distance, the pressing force of the upper roller on the anode strip is reduced from the initial pressing force value to a first pressing force value, and in the case where the upper roller runs to the second running distance, the edge region of the cathode sheet is located at the pressing position point of the upper roller on the anode strip.

2. The press roll pressure control method according to claim 1, wherein In a case where the upper roller runs to the second running distance, the pressing force of the upper roller on the anode strip is reduced from the initial pressing force value to a first pressing force value, comprising: In a case where the upper roller runs to the second running distance, the pressing force of the upper roller on the anode strip is gradually reduced, until the pressing force of the upper roller on the anode strip is reduced to the first pressing force value when the upper roller continues to run the second distance.

3. The press roll pressure control method of claim 1 wherein, In a case where the non-edge region of the cathode sheet is located at the pressing position point of the upper roller on the anode strip, the pressing force of the upper roller on the anode strip is kept as the initial pressing force value, comprising: In a case where the upper roller runs to a third strip distance, the pressure of the upper roller on the anode strip is increased from the first pressure value to the initial pressure value, so that in a case where the non-edge area of the cathode sheet is located at the pressure point of the upper roller on the anode strip, the pressure of the upper roller on the anode strip is maintained at the initial pressure value, and the third strip distance is the sum of the second strip distance and a second distance.

4. The press roll pressure control method according to claim 3, wherein In a case where the upper roller runs to a third strip distance, the pressure of the upper roller on the anode strip is increased from the first pressure value to the initial pressure value, including: In a case where the upper roller runs to a third strip distance, the pressure of the upper roller on the anode strip is gradually increased until the upper roller continues to run for a second distance, and the pressure of the upper roller on the anode strip is increased to the initial pressure value.

5. The press roll pressure control method of claim 1 wherein, The lower roller is fixed, and the upper roller is movable in a direction towards or away from the lower roller; In a case where the upper roller runs to a second strip distance, the pressure of the upper roller on the anode strip is reduced from an initial pressure value to a first pressure value, including: In a case where the upper roller runs to a second strip distance, the upper roller is controlled to move away from the lower roller to reduce the pressure of the upper roller on the anode strip from an initial pressure value to a first pressure value.

6. The press roll pressure control method of claim 5, wherein, The laminating device further comprises a motor for moving the upper roller; In a case where the upper roller runs to a second strip distance, the upper roller is controlled to move away from the lower roller, including: In a case where the upper roller runs to a second strip distance, the motor is controlled to rotate according to a first corresponding relationship, so that the upper roller moves away from the lower roller to reduce the pressure of the upper roller on the anode strip from an initial pressure value to a first pressure value, and the first corresponding relationship comprises a corresponding relationship between the rotation angle of the motor and the pressure of the upper roller on the anode strip.

7. The press roll pressure control method of claim 6 wherein, The laminating device further comprises a first inclined iron sliding block and a second inclined iron sliding block that engage with each other, the first inclined iron sliding block is connected to the upper roller through a connecting mechanism, and the second inclined iron sliding block is connected to the motor; The motor rotates to drive the second inclined iron sliding block to move, the movement of the second inclined iron sliding block drives the first inclined iron sliding block to move, and the first inclined iron sliding block drives the upper roller to move away from the lower roller or drives the upper roller to move towards the lower roller.

8. The press roll pressure control method according to any one of claims 1-7, wherein, The upper roller is provided with a pressure sensor, and the method further comprises: The pressure sensor obtains the value of the pressure of the upper roller on the anode strip.

9. A pressure control device for a press roll, applied to a lamination device, the lamination device including an upper roll and a lower roll that press a roll of anode material, and a detection unit, wherein, The upper roller and the lower roller are oppositely arranged, the anode strip is arranged between the upper roller and the lower roller, a plurality of cathode sheets are arranged on two surfaces of the anode strip in sequence and staggeredly, rotating directions of the upper roller and the lower roller are matched with a moving direction of the anode strip, the upper roller and the lower roller cooperate to press the cathode sheet on the anode strip, a plurality of cut holes are arranged on the anode strip, and one cathode sheet is included between two adjacent cut holes, and the detection unit is used for detecting the cut hole on the anode strip. The first adjusting module is used for reducing the pressing force of the upper roller on the anode strip when the edge region of the cathode sheet is located at the pressing position point of the upper roller on the anode strip, so that the pressing force of the upper roller on the anode strip is less than the initial pressing value. The second adjusting module is used for keeping the pressing force of the upper roller on the anode strip as the initial pressing value when the non-edge region of the cathode sheet is located at the pressing position point of the upper roller on the anode strip, and the non-edge region of the cathode sheet is a region of the cathode sheet except the edge region. The first adjusting module comprises: The first obtaining sub-module is used for obtaining a first running distance of the upper roller when the detection unit detects the cut hole on the anode strip. The second obtaining sub-module is used for obtaining a first distance between the cut hole and the pressing position point of the upper roller on the anode strip. The third obtaining sub-module is used for obtaining a second distance obtained by adding a preset distance to a distance from the cut hole to an adjacent cathode sheet. The fourth obtaining sub-module is used for obtaining a target distance by subtracting the second distance from the first distance. The fifth obtaining sub-module is used for determining a second running distance according to a sum of the first running distance and the target distance. The first adjusting sub-module is used for reducing the pressing force of the upper roller on the anode strip from the initial pressing value to a first pressing value when the upper roller runs to the second running distance, and the edge region of the cathode sheet is located at the pressing position point of the upper roller on the anode strip.

10. A press roll pressure control system, the system comprising a lamination device and a controller, the lamination device comprising an upper roll and a lower roll that press an anode ribbon, and a detection unit, wherein, The upper roller and the lower roller are oppositely arranged, the anode strip is arranged between the upper roller and the lower roller, a plurality of cathode sheets are arranged on two surfaces of the anode strip in sequence and staggeredly, rotating directions of the upper roller and the lower roller are matched with a moving direction of the anode strip, the upper roller and the lower roller cooperate to press the cathode sheet on the anode strip, a plurality of cut holes are arranged on the anode strip, and one cathode sheet is included between two adjacent cut holes, and the detection unit is used for detecting the cut hole on the anode strip. The controller is used for reducing the pressing force of the upper roller on the anode strip when the edge region of the cathode sheet is located at the pressing position point of the upper roller on the anode strip, so that the pressing force of the upper roller on the anode strip is less than the initial pressing value. In a case where the non-edge area of the cathode sheet is located at the position point of the pressure roller of the upper roller on the anode strip, the controller keeps the pressure roller pressure of the upper roller on the anode strip at the initial pressure value, the non-edge area of the cathode sheet being an area of the cathode sheet other than the edge area; The controller is further configured to: In a case where the cutting hole on the anode strip is detected by the detection unit, acquire a first running distance of the upper roller; acquire a first distance between the cutting hole and the position point of the pressure roller of the upper roller on the anode strip; acquire a second distance obtained by adding a preset distance to a distance from the cutting hole to an adjacent cathode sheet; subtract the second distance from the first distance to obtain a target distance; determine a second running distance according to a sum of the first running distance and the target distance; in a case where the upper roller runs to the second running distance, reduce the pressure roller pressure of the upper roller on the anode strip from the initial pressure value to a first pressure value, wherein, in the case where the upper roller runs to the second running distance, the edge area of the cathode sheet is located at the position point of the pressure roller of the upper roller on the anode strip.

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