Method for controlling separator tension in stacking device, and stacked battery

Abstract

A method for controlling tension of a separator (101) in a stacking device, and a stacked battery. The stacking device comprises a separator unwinding mechanism (100), a separator tensioning mechanism (200), a separator buffering mechanism (300), a fixed roller (400), a separator pair-roller mechanism (500), and a stacking table (700). The separator (101) sequentially passes through the separator tensioning mechanism (200), the separator buffering mechanism (300), the fixed roller (400), the separator pair-roller mechanism (500), and the stacking table (700). The control method comprises: determining a starting position (X1), a first intermediate position (X2) and an end position (X3) of a separator pair-roller mechanism (500) during a movement process, the first intermediate position (X2) being located between the starting position (X1) and the end position (X3), and when the separator pair-roller mechanism (500) is located at the first intermediate position (X2), the length of a separator (101) from a fixed roller (400) to the starting position (X1) on a stacking table (700) being the shortest length (S101); during movement of the separator pair-roller mechanism (500) from the starting position (X1) to the first intermediate position (X2), controlling the maximum damping tension of the separator tensioning mechanism (200) to be a first tension (F1) (S102); during movement of the separator pair-roller mechanism (500) from the first intermediate position (X2) to the end position (X3), controlling the maximum damping tension of the separator tensioning mechanism (200) to be a second tension (F2), the first tension (F1) being greater than the second tension (F2) (S103).

Description

Lamella device diaphragm tension control method and lamella battery

[0001] The present application claims priority to the Chinese patent application No. 2024113773980, filed on September 29, 2024, and entitled "Lamella device diaphragm tension control method and lamella battery", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of lithium batteries, in particular to a lamella device diaphragm tension control method and a lamella battery. BACKGROUND

[0003] In the process of laminating, the lamella device has large tension fluctuations due to reasons such as signal transmission, structural limitations, motion acceleration and deceleration, friction between the diaphragm and the roller, and the like. The diaphragm tension mechanism needs to swing in real time to ensure that the diaphragm tends to the tension setting value in real time. The existing lamella device diaphragm tension control technology uses a mathematical model to calculate the length change of the diaphragm between the diaphragm buffer mechanism and the laminating table caused by the lateral movement of the roller mechanism during the laminating process, and transmits it to the diaphragm buffer mechanism in real time, so as to ensure that the diaphragm buffer mechanism compensates for the length change of the diaphragm in real time, and ensures the length of the diaphragm to ensure the tension. In fact, because of the structure of the diaphragm buffer mechanism, the lateral movement also pulls the diaphragm before and after the position, although the diaphragm is pulled less because the diaphragm unwinding mechanism is stationary, but it will still cause the travel of the diaphragm buffer mechanism and the actual diaphragm length to be mismatched, causing the diaphragm tension to fluctuate. SUMMARY

[0004] The present application provides a lamella device diaphragm tension control method that can accurately recover and release the diaphragm length between the diaphragm buffer mechanism and the laminating table in time.

[0005] In a first aspect, the present application provides a lamella device diaphragm tension control method, the lamella device comprising a diaphragm unwinding mechanism, a diaphragm tension mechanism, a diaphragm buffer mechanism, a fixed roller, a diaphragm roller mechanism and a laminating table; the diaphragm unwinding mechanism is used to release the diaphragm, and the diaphragm passes through the diaphragm tension mechanism, the diaphragm buffer mechanism, the fixed roller, the diaphragm roller mechanism and the laminating table in turn; the tension mechanism is used to set the damping tension to adjust the diaphragm tension; the diaphragm buffer mechanism is used to buffer the diaphragm released by the diaphragm unwinding mechanism; the diaphragm roller mechanism is used to drive the diaphragm to move linearly and reciprocally, and to fold the diaphragm;

[0006] The control method comprises:

[0007] determining a start position, a first intermediate position and an end position of the diaphragm-roller mechanism in a movement process, the first intermediate position being between the start position and the end position, and the length of the diaphragm from the fixed roller to the start position of the laminating table being the shortest when the diaphragm-roller mechanism is at the first intermediate position;

[0008] controlling the maximum damping tension of the diaphragm tension mechanism to be a first tension during the movement of the diaphragm-roller mechanism from the start position to the first intermediate position;

[0009] controlling the maximum damping tension of the diaphragm tension mechanism to be a second tension during the movement of the diaphragm-roller mechanism from the first intermediate position to the end position, the first tension being greater than the second tension.

[0010] The present application realizes diaphragm variable tension control by setting the first tension and the second tension of the diaphragm tension mechanism. The first tension refers to the maximum damping tension of the diaphragm tension mechanism that can be pulled by the diaphragm during the movement of the diaphragm-roller mechanism from the start position to the first intermediate position, and the second tension refers to the maximum damping tension of the diaphragm tension mechanism that can be pulled by the diaphragm during the movement of the diaphragm-roller mechanism from the first intermediate position to the end position, and the first tension is greater than the second tension. When the diaphragm tension mechanism is set to the first tension, the diaphragm between the diaphragm tension mechanism and the laminating table is not easy to pull the diaphragm tension mechanism, and the length of the diaphragm between the diaphragm buffer mechanism and the laminating table can be accurately recovered and released by the diaphragm buffer mechanism in time, ensuring the consistency of the length of the diaphragm recovered by the diaphragm buffer mechanism and the reduced length of the diaphragm between the diaphragm buffer mechanism and the laminating table. At the same time, the diaphragm between the diaphragm unwinding mechanism and the diaphragm tension mechanism is not pulled, improving the accuracy of the length of the diaphragm released by the diaphragm unwinding mechanism. When the diaphragm tension mechanism is set to the second tension, the diaphragm can pull the diaphragm tension mechanism to move, making it difficult for the diaphragm tension to change greatly, reducing the amplitude of tension fluctuation, maintaining the tension state of the diaphragm between the diaphragm buffer mechanism and the laminating table, and making it difficult for the diaphragm to wrinkle during the laminating process.

[0011] In the second aspect, the present application also provides a laminated battery laminated by the method of the first aspect.

[0012] The diaphragm passes through the diaphragm unwinding mechanism, the diaphragm tension mechanism, the diaphragm buffer mechanism, the fixed roller, the diaphragm roller pair mechanism and the laminating table in sequence. First, the starting position, the first intermediate position and the end position of the diaphragm roller pair mechanism in the movement process are determined. In the process that the diaphragm roller pair mechanism moves from the starting position to the first intermediate position, the maximum damping tension of the diaphragm tension mechanism is controlled to be the first tension. In the process that the diaphragm roller pair mechanism moves from the first intermediate position to the end position, the maximum damping tension of the diaphragm tension mechanism is controlled to be the second tension. The first tension is greater than the second tension. The diaphragm length between the diaphragm buffer mechanism and the laminating table is accurately recovered or released by the diaphragm buffer mechanism, so as to ensure the consistency between the diaphragm length released by the diaphragm buffer mechanism and the actual diaphragm length reduced or increased between the diaphragm buffer mechanism and the laminating table, ensure that the diaphragm on the laminating table is smooth and wrinkle-free, and form a laminated battery. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background art, the drawings needed to be used in the embodiments of the present application or the background art will be described below.

[0014] Fig. 1 is a schematic diagram of the movement of the diaphragm from the starting position to the end position driven by the diaphragm roller pair mechanism in the present application;

[0015] Fig. 2 is a flow chart of the control method in the present application;

[0016] Fig. 3 is a schematic diagram of the movement of the diaphragm from the end position to the starting position driven by the diaphragm roller pair mechanism in the present application;

[0017] Fig. 4 is a detailed schematic diagram of the movement of the diaphragm from the starting position to the end position driven by the diaphragm roller pair mechanism in the present application;

[0018] Fig. 5 is a schematic diagram of the theoretical relationship between the diaphragm tension and the first tension and the second tension under the diaphragm tension control method of the laminating equipment in the present application;

[0019] Fig. 6 is a schematic diagram of the actual relationship between the diaphragm tension and the first tension and the second tension under the diaphragm tension control method of the laminating equipment in the present application.

[0020] Legend of reference signs: 100-diaphragm unwinding mechanism, 101-diaphragm, 200-diaphragm tension mechanism, 300-diaphragm buffer mechanism, 400-fixed roller; 500-diaphragm roller pair mechanism, 501-upper movable roller, 502-lower movable roller; 700-laminating table; F1-first tension, F2-second tension. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings.

[0022] The application provides a method for controlling the tension of a diaphragm of a lamination device. Referring to FIG. 1, the lamination device comprises a diaphragm unwinding mechanism 100, a diaphragm tension mechanism 200, a diaphragm buffer mechanism 300, a fixed roller 400, a diaphragm roller pair mechanism 500 and a lamination table 700.

[0023] The diaphragm unwinding mechanism 100 releases the diaphragm 101 by rotating, and the diaphragm 101 sequentially passes through the diaphragm tension mechanism 200, the diaphragm buffer mechanism 300, the fixed roller 400, the diaphragm roller pair mechanism 500 and the lamination table 700. The diaphragm tension mechanism 200 is located between the diaphragm unwinding mechanism 100 and the diaphragm buffer mechanism 300. After the diaphragm unwinding mechanism 100 releases a corresponding length of the diaphragm 101 and the diaphragm buffer mechanism 300 buffers the corresponding length of the diaphragm 101, the diaphragm roller pair mechanism 500 starts to laminate the diaphragm 101 by reciprocating linear motion.

[0024] The diaphragm tension mechanism 200 is used to set damping tension to adjust the tension of the diaphragm 101, and the tension of the diaphragm 101 is precisely controlled by swinging.

[0025] The diaphragm buffer mechanism 300 is used to buffer the diaphragm 101 released by the diaphragm unwinding mechanism 100, and the precise length of the diaphragm 101 is recovered and released by transverse movement.

[0026] The fixed roller 400 and the lamination table 700 are fixed, and the diaphragm roller pair mechanism 500 drives the diaphragm 101 to move linearly between the fixed roller 400 and the lamination table 700. The upper movable roller 501 of the diaphragm roller pair mechanism 500 is close to the fixed roller 400 and is used to collect the diaphragm 101, and the lower movable roller 502 of the diaphragm roller pair mechanism 500 is close to the fixed roller 400 and is used to release the diaphragm 101 for folding.

[0027] Referring to FIG. 2, the control method comprises the following steps.

[0028] S101, determining the starting position X1, the first intermediate position X2 and the terminal position X3 of the diaphragm roller pair mechanism 500 in the movement process, the first intermediate position X2 being located between the starting position X1 and the terminal position X3, the length of the diaphragm 101 from the fixed roller 400 to the starting position of the lamination table 700 being the shortest length when the diaphragm roller pair mechanism 500 is located at the first intermediate position X2, and A+B+C1 being the minimum value at this time. The reciprocating linear movement process of the diaphragm roller pair mechanism 500 is as follows:

[0029] The diaphragm 101 drives the diaphragm roller pair mechanism 500 to move from the starting position X1 to the terminal position X3, passing through the first intermediate position X2. As shown in FIG. 1, A is the length of the diaphragm between the fixed roller 400 and the upper movable roller 501 of the diaphragm roller pair mechanism 500, B is the length of the diaphragm in the diaphragm roller pair mechanism 500, and C1 is the length of the diaphragm between the lower movable roller 502 of the diaphragm roller pair mechanism 500 and the starting position of the lamination table 700.

[0030] Table 1

[0031] As shown in Table 1, the lamination device is affected by environmental factors and equipment parameter factors in actual operation process, and there are six special positions. Please refer to FIG. 4, when the diaphragm roller mechanism 500 is located at the starting position X1, A is the maximum value; when the diaphragm roller mechanism 500 is located at the X5 position, C1 is the minimum value; when the diaphragm roller mechanism 500 is located at the X6 position, A+B+C1 is equal to the value of A+B+C1 at the X5 position; there is a position between the X5 position and the X6 position that makes the value of A+B+C1 minimum, which is the first intermediate position X2; when the diaphragm roller mechanism 500 is located at the X7 position, A is the minimum value; when the diaphragm roller mechanism 500 is located at the end position X3, the values of C1 and A+B+C1 are the maximum values.

[0032] In combination with FIG. 1 and FIG. 4, the diaphragm tension state of the starting position X1 in FIG. 1 corresponds to X1 in FIG. 5, the diaphragm tension state of the end position X3 in FIG. 1 corresponds to X3 in FIG. 5, and the diaphragm tension state of the first intermediate position X2 in FIG. 1 corresponds to X2 in FIG. 5.

[0033] S102, during the movement of the diaphragm roller mechanism 500 from the starting position X1 to the first intermediate position X2, the maximum damping tension of the diaphragm tension mechanism 200 is controlled to be the first tension F1. When the diaphragm tension mechanism 200 is set to the first tension F1, the diaphragm between the diaphragm tension mechanism 200 and the lamination table 700 is not easy to pull the diaphragm tension mechanism 200, and the diaphragm length between the diaphragm buffer mechanism 300 and the lamination table 700 can be accurately recovered and released by the diaphragm buffer mechanism 300 in time, ensuring the consistency of the diaphragm length recovered by the diaphragm buffer mechanism 300 and the actual diaphragm length between the diaphragm buffer mechanism 300 and the lamination table 700. At the same time, it will not pull the diaphragm between the diaphragm unwinding mechanism 100 and the diaphragm tension mechanism 200, improving the accuracy of the diaphragm length released by the diaphragm unwinding mechanism 100.

[0034] S103, during the movement of the diaphragm roller mechanism 500 from the first intermediate position X2 to the end position X3, the maximum damping tension of the diaphragm tension mechanism 200 is controlled to be the second tension F2, and the first tension F1 is greater than the second tension F2. When the diaphragm tension mechanism 200 is set to the second tension F2, the diaphragm 101 can pull the diaphragm tension mechanism 200 to move, so that the diaphragm tension is difficult to change greatly, the tension fluctuation amplitude is reduced, the diaphragm tension state between the diaphragm buffer mechanism 300 and the lamination table 700 is maintained, and the diaphragm is difficult to produce wrinkles during the lamination process.

[0035] In the process that the diaphragm roller mechanism 500 moves from the starting position X1 to the first intermediate position X2, the first tension F1 is greater than or equal to the diaphragm tension. When the first tension F1 is greater than or equal to the diaphragm tension, the diaphragm 101 between the diaphragm tension mechanism 200 and the laminating table 700 is not easy to pull the diaphragm tension mechanism 200, and the diaphragm length between the diaphragm buffer mechanism 300 and the laminating table 700 can be accurately recovered and released by the diaphragm buffer mechanism 300 in time, keeping the consistency of the diaphragm length recovered by the diaphragm buffer mechanism 300 and the actual diaphragm length between the diaphragm buffer mechanism 300 and the laminating table 700. At the same time, it will not pull the diaphragm between the diaphragm unwinding mechanism 100 and the diaphragm tension mechanism 200, improving the accuracy of the diaphragm length released by the diaphragm unwinding mechanism 100.

[0036] In the process that the diaphragm roller mechanism 500 moves from the first intermediate position X2 to the terminal position X3, the second tension F2 is less than or equal to the diaphragm tension. When the second tension F2 is less than or equal to the diaphragm tension, the diaphragm 101 can pull the diaphragm tension mechanism 200 to move, reduce the tension fluctuation of the diaphragm 101 in the laminating process, keep the diaphragm tension state between the diaphragm buffer mechanism 300 and the laminating table 700, and make it difficult for the diaphragm to produce wrinkles in the laminating process.

[0037] The first tension F1 is 1.5-2 times the second tension F2. In the laminating equipment, the elasticity of the diaphragm is a very important characteristic, which directly affects the performance and safety of the lithium battery. When the difference between the first tension F1 and the second tension F2 is too large, the diaphragm elasticity is easy to fail. When the difference between the first tension F1 and the second tension F2 is too small, it is not enough to make the diaphragm tension mechanism 200 convert from the first tension F1 to the second tension F2. When the first tension F1 is 1.5-2 times the second tension F2, the diaphragm tension mechanism 200 has sufficient time to convert from the first tension F1 to the second tension F2, and can also avoid diaphragm elasticity failure, keep the diaphragm tension state between the diaphragm buffer mechanism 300 and the laminating table 700, make it difficult for the diaphragm to produce wrinkles in the laminating process, and also improve the thickness uniformity of the diaphragm in the production process.

[0038] It can be understood that the diaphragm elasticity refers to the ability of the diaphragm to deform under the action of external force under a certain working pressure and to restore to its original shape and size after the external force is removed.

[0039] The time for the diaphragm roller mechanism 500 to move from the starting position X1 to the first intermediate position X2 is less than or equal to 0.3 seconds. In the actual lamination process, the change of the diaphragm tension is relatively lagging, and it takes a certain time for the diaphragm tension to become large, while the first tension F1 is a fixed value. If the diaphragm roller mechanism 500 moves for too long, it may cause the diaphragm tension to reach the first tension F1, thereby pulling the diaphragm tension mechanism 200 and causing the diaphragm to generate a larger tension fluctuation, making it difficult for the diaphragm length between the diaphragm buffer mechanism 300 and the lamination table 700 to be accurately recovered and released by the diaphragm buffer mechanism 300 in time. And since the first tension F1 is 1.5-2 times the second tension F2, the movement time of 0.3s is not enough to make the diaphragm tension reach the first tension F1, so that the diaphragm tension mechanism 200 is not easy to be pulled.

[0040] In the process of moving the diaphragm roller mechanism 500 from the starting position to the first intermediate position X2, the length of the diaphragm 101 between the diaphragm buffer mechanism 300 and the lamination table 700 gradually decreases, and the value of A+B+C1 gradually decreases at this time. The diaphragm buffer mechanism 300 synchronously recovers the corresponding length of the diaphragm to make the diaphragm between the diaphragm buffer mechanism 300 and the lamination table 700 tight. In this process, the diaphragm buffer mechanism 300 synchronously recovers the corresponding length of the diaphragm without pulling the diaphragm in front of its position, i.e. the diaphragm between the diaphragm tension mechanism 200 and the diaphragm unwinding mechanism 100, to ensure the consistency of the length of the diaphragm recovered by the diaphragm buffer mechanism 300 and the actual length of the diaphragm between the diaphragm buffer mechanism 300 and the lamination table 700.

[0041] In the process of moving the diaphragm roller mechanism 500 from the first intermediate position X2 to the end position X3, the length of the diaphragm between the diaphragm buffer mechanism 300 and the lamination table 700 gradually increases, and the diaphragm buffer mechanism 300 synchronously releases the diaphragm 101 to compensate for the length of the diaphragm required by the diaphragm buffer mechanism 300 and the lamination table 700. In this process, the length of the diaphragm between the diaphragm buffer mechanism 300 and the lamination table 700 is accurately released by the diaphragm buffer mechanism 300 in time, ensuring the consistency of the length of the diaphragm released by the diaphragm buffer mechanism 300 and the actual length of the diaphragm between the diaphragm buffer mechanism 300 and the lamination table 700, and ensuring that the diaphragm on the lamination table is smooth and wrinkle-free.

[0042] As shown in FIG. 5, during the movement of the diaphragm pair roller mechanism 500 from the first intermediate position to the terminal position, the rate of change of the diaphragm tension is greater than the rate of change of the diaphragm tension during the movement of the diaphragm pair roller mechanism 500 from the starting position to the first intermediate position. During the movement of the diaphragm pair roller mechanism 500 from the first intermediate position X2 to the terminal position X3, the diaphragm tension decreases. In order to make the diaphragm tension less likely to change greatly, reduce the amplitude of the tension fluctuation, maintain the tension state of the diaphragm between the diaphragm buffer mechanism 300 and the lamination table 700, and make the diaphragm less likely to wrinkle during lamination, the diaphragm tension mechanism 200 sets the second tension F2. Since the second tension F2 is less than or equal to the diaphragm tension, the rate of change of the diaphragm tension during the movement of the diaphragm pair roller mechanism 500 from the first intermediate position X2 to the terminal position X3 is greater than the rate of change of the diaphragm tension during the movement of the diaphragm pair roller mechanism 500 from the starting position X1 to the first intermediate position X2, which can avoid large tension fluctuations during diaphragm lamination.

[0043] It is worth noting that, as shown in FIG. 6, in actual lamination, due to the influence of the production equipment, both the process of setting the first tension F1 and the process of switching from the first tension F1 to the second tension F2 require a certain displacement for buffering, and the rate of change of the diaphragm tension during these two processes is greater than the rate of change of the diaphragm tension. At the same time, during the movement of the diaphragm pair roller mechanism 500 from the first intermediate position X2 to the terminal position X3, there may be a position X0 that makes the diaphragm tension equal to the second tension F2, so that the diaphragm 101 can pull the diaphragm tension mechanism 200 and reduce the amplitude of the diaphragm tension fluctuation.

[0044] In another embodiment, as shown in FIG. 3, the diaphragm 101 moves the diaphragm pair roller mechanism 500 from the terminal position X3 to the starting position X1, passing through the second intermediate position X4, and C2 is the length of the diaphragm between the lower movable roller 502 of the diaphragm pair roller mechanism 500 and the end position of the lamination table 700.

[0045] The diaphragm tension mechanism 200 is used to set a damping tension to adjust the tension of the diaphragm 101, and precise control of the diaphragm tension is achieved through swinging;

[0046] The diaphragm buffer mechanism 300 is used to buffer the diaphragm 101 released by the diaphragm unwinding mechanism 100, and precise length recovery and release of the diaphragm 101 are achieved through horizontal movement;

[0047] The fixed roller 400 and the lamination table 700 are fixed, and the diaphragm pair roller mechanism 500 drives the diaphragm 101 to move linearly between the fixed roller 400 and the lamination table 700. Among them, the upper movable roller 501 of the diaphragm pair roller mechanism 500 is close to the fixed roller 400, which is used to collect the diaphragm 101, and the lower movable roller 502 of the diaphragm pair roller mechanism 500 is close to the fixed roller 400, which is used to release the diaphragm 101 for folding.

[0048] The control method comprises:

[0049] The control method comprises:

[0050] In the process of moving the diaphragm roller mechanism 500 from the end position X3 to the second intermediate position X4, the maximum damping tension of the diaphragm tension mechanism 200 is controlled to be the first tension F1. When the diaphragm tension mechanism 200 is set to the first tension F1, the diaphragm between the diaphragm tension mechanism 200 and the laminating table 700 is not easy to pull the diaphragm tension mechanism 200, and the length of the diaphragm between the diaphragm buffer mechanism 300 and the laminating table 700 can be accurately recovered and released by the diaphragm buffer mechanism 300 in time, ensuring the consistency of the diaphragm length recovered by the diaphragm buffer mechanism 300 and the actual reduced length of the diaphragm between the diaphragm buffer mechanism 300 and the laminating table 700. At the same time, the diaphragm between the diaphragm unwinding mechanism 100 and the diaphragm tension mechanism 200 is not pulled, improving the accuracy of the diaphragm length released by the diaphragm unwinding mechanism 100.

[0051] In the process of moving the diaphragm roller mechanism 500 from the second intermediate position X4 to the starting position X1, the maximum damping tension of the diaphragm tension mechanism 200 is controlled to be the second tension F2, and the first tension F1 is greater than the second tension F2. When the diaphragm tension mechanism 200 is set to the second tension F2, the diaphragm 101 can pull the diaphragm tension mechanism 200 to move, reduce the tension fluctuation of the diaphragm in the laminating process, and maintain the tension state of the diaphragm between the diaphragm buffer mechanism 300 and the laminating table 700,

[0052] In the process of moving the diaphragm roller mechanism 500 from the end position X3 to the second intermediate X4 position, the first tension F1 is greater than or equal to the diaphragm tension. When the first tension F1 is greater than or equal to the diaphragm tension, the diaphragm 101 between the diaphragm tension mechanism 200 and the laminating table 700 is not easy to pull the diaphragm tension mechanism 200, and the length of the diaphragm between the diaphragm buffer mechanism 300 and the laminating table 700 can be accurately recovered and released by the diaphragm buffer mechanism 300 in time, maintaining the consistency of the diaphragm length recovered by the diaphragm buffer mechanism 300 and the actual reduced length of the diaphragm between the diaphragm buffer mechanism 300 and the laminating table 700. At the same time, the diaphragm between the diaphragm unwinding mechanism 100 and the diaphragm tension mechanism 200 is not pulled, improving the accuracy of the diaphragm length released by the diaphragm unwinding mechanism 100.

[0053] In the process that the diaphragm roller mechanism 500 moves from the second intermediate position X4 to the starting position X1, the second tension F2 is less than or equal to the diaphragm tension. When the second tension F2 is less than or equal to the diaphragm tension, the diaphragm 101 can pull the diaphragm tension mechanism 200 to move, reduce the tension fluctuation of the diaphragm 101 in the laminating process, keep the diaphragm tension state between the diaphragm buffer mechanism 300 and the laminating table 700, and make the diaphragm less likely to wrinkle in the laminating process.

[0054] The first tension F1 is 1.5-2 times the second tension F2. In the laminating equipment, the elasticity of the diaphragm is a very important characteristic, which directly affects the performance and safety of the lithium battery. When the difference between the first tension F1 and the second tension F2 is too large, the elasticity of the diaphragm is easily lost. When the difference between the first tension F1 and the second tension F2 is too small, the diaphragm tension mechanism 200 is not enough to convert from the first tension F1 to the second tension F2. When the first tension F1 is 1.5-2 times the second tension F2, the time for the diaphragm tension mechanism 200 to convert from the first tension F1 to the second tension F2 is sufficient, the elasticity of the diaphragm can be avoided to be lost, the diaphragm tension state between the diaphragm buffer mechanism 300 and the laminating table 700 can be kept, the diaphragm is less likely to wrinkle in the laminating process, and the thickness uniformity of the diaphragm in the production process can be improved.

[0055] The time for the diaphragm roller mechanism 500 to move from the end position X3 to the second intermediate position X4 is less than or equal to 0.3 seconds. In the actual laminating process, the change of the diaphragm tension is relatively lagging, and it takes a certain time for the diaphragm tension to increase. The first tension F1 is a fixed value. If the diaphragm roller mechanism 500 moves for too long, the diaphragm tension may reach the first tension F1, thereby pulling the diaphragm tension mechanism 200 and causing the diaphragm to have a large tension fluctuation. The diaphragm length between the diaphragm buffer mechanism 300 and the laminating table 700 is less likely to be accurately recovered and released by the diaphragm buffer mechanism 300 in time. Moreover, since the first tension F1 is 1.5-2 times the second tension F2, the movement time of 0.3s is not enough for the diaphragm tension to reach the first tension F1, so that the diaphragm tension mechanism 200 is not easily pulled.

[0056] In the process that the diaphragm roller mechanism 500 moves from the end position X3 to the second intermediate position X4, the diaphragm 101 length between the diaphragm buffer mechanism 300 and the laminating table 700 gradually decreases, and the value of A+B+C2 gradually decreases at this time. The diaphragm buffer mechanism 300 synchronously recovers the corresponding length of the diaphragm to make the diaphragm between the diaphragm buffer mechanism 300 and the laminating table 700 tight. In this process, the diaphragm buffer mechanism 300 synchronously recovers the corresponding length of the diaphragm without pulling the diaphragm in front of its position, i.e., the diaphragm between the diaphragm tension mechanism 200 and the diaphragm unwinding mechanism 100, to ensure the consistency of the diaphragm length recovered by the diaphragm buffer mechanism 300 and the actual diaphragm length between the diaphragm buffer mechanism 300 and the laminating table 700.

[0057] During the movement of the diaphragm roller mechanism 500 from the second intermediate position X4 to the starting position X1, the diaphragm length between the diaphragm buffer mechanism 300 and the laminating table 700 gradually increases, and the value of A+B+C2 gradually increases,

[0058] The diaphragm buffer mechanism 300 synchronously releases the diaphragm 101 to compensate for the diaphragm length increase between the diaphragm buffer mechanism 300 and the laminating table 700. During this process, the diaphragm length between the diaphragm buffer mechanism 300 and the laminating table 700 is accurately released by the diaphragm buffer mechanism 300, ensuring the consistency of the diaphragm length released by the diaphragm buffer mechanism 300 and the actual diaphragm length increase between the diaphragm buffer mechanism 300 and the laminating table 700, and ensuring the stability and smoothness of the diaphragm on the laminating table.

[0059] During the movement of the diaphragm roller mechanism 500 from the second intermediate position X4 to the starting position X1, the change rate of the decrease of the diaphragm tension is greater than the change rate of the increase of the diaphragm tension during the movement of the diaphragm roller mechanism 500 from the end position X3 to the second intermediate position X4. During the movement of the diaphragm roller mechanism 500 from the second intermediate position X4 to the starting position X1, the diaphragm tension decreases. To control the fluctuation of the diaphragm tension and ensure the stability and smoothness of the diaphragm on the laminating table 700, the diaphragm tension mechanism 200 sets the second tension F2. Since the second tension F2 is less than or equal to the diaphragm tension, the change rate of the decrease of the diaphragm tension during the movement of the diaphragm roller mechanism 500 from the second intermediate position X4 to the starting position X1 is greater than the change rate of the increase of the diaphragm tension during the movement of the diaphragm roller mechanism 500 from the end position X3 to the second intermediate position X4, so as to avoid a large tension fluctuation of the diaphragm 101 during lamination.

[0060] In another aspect, the application also provides a laminated battery, which is laminated by the above implementation steps. The diaphragm sequentially passes through the diaphragm unwinding mechanism 100, the diaphragm tension mechanism 200, the diaphragm buffer mechanism 300, the fixed roller 400, the diaphragm roller mechanism 500 and the laminating table. First, the starting position, the first intermediate position and the end position of the diaphragm roller mechanism 500 during movement are determined. During the movement of the diaphragm roller mechanism 500 from the starting position to the first intermediate position, the maximum damping tension of the diaphragm tension mechanism 200 is controlled to be the first tension. During the movement of the diaphragm roller mechanism 500 from the first intermediate position to the end position, the maximum damping tension of the diaphragm tension mechanism 200 is controlled to be the second tension, and the first tension is greater than the second tension. The diaphragm length between the diaphragm buffer mechanism 300 and the laminating table 700 is accurately recovered or released by the diaphragm buffer mechanism 300 in time, ensuring the consistency of the diaphragm length released by the diaphragm buffer mechanism 300 and the actual diaphragm length decrease or increase between the diaphragm buffer mechanism 300 and the laminating table 700, ensuring the stability and smoothness of the diaphragm on the laminating table, and forming a laminated battery.

[0061] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0062] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0065] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method of controlling the tension of a separator film for a laminating apparatus, characterized by, The lamination device comprises a diaphragm unwinding mechanism, a diaphragm tension mechanism, a diaphragm buffer mechanism, a fixed roller, a diaphragm roller pair mechanism and a lamination table; the diaphragm unwinding mechanism is used to release the diaphragm, which passes through the diaphragm tension mechanism, the diaphragm buffer mechanism, the fixed roller, the diaphragm roller pair mechanism and the lamination table in sequence; the tension mechanism is used to set the damping tension to adjust the diaphragm tension; the diaphragm buffer mechanism is used to buffer the diaphragm released by the diaphragm unwinding mechanism; The diaphragm roller pair mechanism is used to drive the diaphragm to realize the folding of the diaphragm through linear reciprocating motion; The control method comprises: determining the starting position, the first intermediate position and the end position of the diaphragm roller pair mechanism in the movement process; the first intermediate position is located between the starting position and the end position, and the length of the diaphragm from the fixed roller to the starting position of the lamination table is the shortest when the diaphragm roller pair mechanism is located at the first intermediate position; controlling the maximum damping tension of the diaphragm tension mechanism to be the first tension during the movement of the diaphragm roller pair mechanism from the starting position to the first intermediate position; controlling the maximum damping tension of the diaphragm tension mechanism to be the second tension during the movement of the diaphragm roller pair mechanism from the first intermediate position to the end position, and the first tension is greater than the second tension.

2. The method of claim 1, wherein, The first tension is greater than the diaphragm tension during the movement of the diaphragm roller pair mechanism from the starting position to the first intermediate position. And / or The second tension is less than or equal to the diaphragm tension during the movement of the diaphragm roller pair mechanism from the first intermediate position to the end position.

3. The method according to claim 1 or 2, characterized in that, The first tension is 1.5-2 times the second tension; And / or The time for the diaphragm roller pair mechanism to move from the starting position to the first intermediate position is less than or equal to 0.3 seconds.

4. The method of claim 1, wherein, The length of the diaphragm between the diaphragm buffer mechanism and the lamination table gradually decreases during the movement of the diaphragm roller pair mechanism from the starting position to the first intermediate position, and the diaphragm is recovered synchronously through the diaphragm buffer mechanism to make the diaphragm between the diaphragm buffer mechanism and the lamination table taut.

5. The method according to claim 1 or 4, characterized in that, The length of the diaphragm between the diaphragm buffer mechanism and the lamination table increases during the movement of the diaphragm roller pair mechanism from the first intermediate position to the end position, and the diaphragm is released through the diaphragm buffer mechanism to compensate for the required diaphragm length due to the increase of the diaphragm length between the diaphragm buffer mechanism and the lamination table.

6. The method of claim 1, wherein, The change rate of the diaphragm tension during the movement of the diaphragm roller pair mechanism from the first intermediate position to the end position is greater than the change rate of the diaphragm during the movement of the diaphragm roller pair mechanism from the starting position to the first intermediate position.

7. The method of claim 1, wherein, The diaphragm roller pair mechanism will pass through a second intermediate position during the movement from the end position to the starting position; the second intermediate position is located between the starting position and the end position, and the length of the diaphragm from the fixed roller to the end position of the lamination table is the shortest when the diaphragm roller pair mechanism is located at the second intermediate position; controlling the maximum damping tension of the separator tension mechanism to be the first tension during the movement of the separator roller mechanism from the end point position to the second intermediate position; controlling the maximum damping tension of the separator tension mechanism to be the second tension during the movement of the separator roller mechanism from the second intermediate position to the start point position.

8. The method of claim 7, wherein, the first tension is greater than or equal to the separator tension during the movement of the separator roller mechanism from the end point position to the second intermediate position; and / or the second tension is less than or equal to the separator tension during the movement of the separator roller mechanism from the second intermediate position to the start point position.

9. The method of claim 7, wherein, the time of the movement of the separator roller mechanism from the end point position to the second intermediate position is less than or equal to 0.3 seconds.

10. The method of claim 7, wherein, the length of the separator between the separator buffer mechanism and the laminated plate gradually decreases during the movement of the separator roller mechanism from the end point position to the second intermediate position, and the separator is synchronously recovered by the separator buffer mechanism to make the separator between the separator buffer mechanism and the laminated plate taut.

11. The method according to claim 7 or 10, characterized in that, the length of the separator between the separator buffer mechanism and the laminated plate gradually increases during the movement of the separator roller mechanism from the second intermediate position to the start point position, and the separator is released by the separator buffer mechanism to compensate for the length of the separator required by the length of the separator between the separator buffer mechanism and the laminated plate.

12. The method of claim 7, wherein, the tension of the separator gradually decreases during the movement of the separator roller mechanism from the second intermediate position to the start point position, and the rate of change is greater than the rate of change of the tension of the separator during the movement of the separator roller mechanism from the end point position to the second intermediate position.

13. A stacked battery, characterized by the laminated battery is laminated by the method of any one of claims 1-12.

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