Flexible pressing claw and lamination stacking machine

Abstract

The utility model discloses a flexible pressing claw and a lamination stacking machine, and relates to the technical field of pressing claws. The device specifically comprises a main body and a flexible check block, the main body comprises a connecting part and a supporting part, and the supporting part protrudes out of the side wall of the connecting part in the first direction; the flexible stop block is connected with the connecting part and covers the attaching end of the connecting part in the second direction; the thin film abuts against the flexible check block and is folded in the second direction to be attached to the outer wall of the supporting part. The supporting part of the connecting part in the first direction and the flexible check block of the connecting part in the second direction jointly make contact with a film on the periphery of the main body, the film makes contact with and is tightly pressed on the flexible check block and the connecting part, the contact area of the flexible pressing claw and the film is increased, and film damage caused by too large pressure is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pressing jaw, especially relates to a flexible pressing jaw and a lamination machine. BACKGROUND

[0002] The assembly mode of lithium ion square battery and soft package battery is generally winding or lamination. With the battery thickness getting thicker and thicker, and the application of silicon negative electrode, the lamination assembly mode with smaller internal stress is paid more and more attention. Lamination needs to use a lamination machine, and the pressing jaw on the lamination machine table is used to press the diaphragm to ensure the alignment of the diaphragm in the lamination process. Therefore, the pressing jaw needs to have certain pressure to press the diaphragm. At the same time, the lamination machine uses diaphragm roll stock, and also needs to maintain certain tension in the lamination process.

[0003] In the prior art, the pressing jaw is flat, and in the lamination process, the pressing jaw directly contacts the diaphragm and applies pressure to meet the lamination operation of the diaphragm. However, in the above scheme, since the flat pressing jaw directly contacts the diaphragm and the contact area is large, the local pressure of the film is too high, which easily damages the diaphragm. At the same time, the lamination machine also has tension, and the diaphragm is easily broken when the pressing jaw is pressed, resulting in low lamination yield.

[0004] Therefore, the present application solves the problem that the local pressure of the pressing jaw is too high and the diaphragm is damaged in the lamination process. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a flexible pressing jaw and a lamination machine, which aims to optimize the structure of the pressing jaw and improve the stress uniformity of the film during lamination, so as to prevent the local pressure of the film from being too high due to the pressing jaw, which causes damage to the film.

[0006] In order to achieve the above purpose, the utility model provides a flexible pressing jaw, which comprises:

[0007] A main body comprising:

[0008] A connecting part;

[0009] A supporting part protruding from the side wall of the connecting part in the first direction;

[0010] A flexible stopper connected with the connecting part, wherein the flexible stopper covers the fitting end of the connecting part in the second direction;

[0011] Wherein, the film is abutted against the flexible stopper and is folded and fitted on the outer wall of the supporting part in the second direction.

[0012] In the above scheme, the flexible stopper is used to replace the original fitting end, and the flexible stopper and the supporting part jointly act to make the film around the main body directly fitted on the flexible stopper and the supporting part, thereby improving the contact area of the film and avoiding the concentration of the pressure of the film, which causes the film to be folded and damaged.

[0013] Further, the connecting portion is integrally formed with the supporting portion.

[0014] Further, the connecting portion has a hollow structure to provide deformation.

[0015] Further, the cross section of the connecting portion is double circular ring, H-shaped or convex-shaped.

[0016] Further, when the connecting portion is double circular ring, two mutually fixed connecting portions are arranged in sequence along the second direction.

[0017] Further, the flexible stopper includes an assembly surface fixed to the connecting portion, and the edge of the assembly surface is smoothly connected with the connecting portion.

[0018] Further, the assembly surface at least partially extends to the hollow structure of the connecting portion.

[0019] Further, the same side of the plurality of supporting portions is located on the same plane along the second direction.

[0020] Further, the connecting portion and the supporting portion are integrally formed.

[0021] The application further discloses a laminating machine, which is provided with the flexible pressing jaw.

[0022] The above technical scheme has the following advantages:

[0023] The flexible pressing jaw and the film are in contact with each other, and the contact area between the flexible pressing jaw and the film is increased, and the local pressure during pressing is effectively dispersed, so that the film is not damaged due to excessive pressure.

[0024] The utility model discloses a hollow structure is used on the connecting portion, makes the connecting portion have certain deformation, when the film is pressed on the connecting portion, the deformation of connecting portion can play the role of buffering to the film, prevents the film from being overstrained, causes the risk of film rupture. BRIEF DESCRIPTION OF DRAWINGS

[0025] The utility model will be explained in detail below in combination with specific embodiments and drawings, wherein:

[0026] Figure 1 It is the structure diagram of the first kind of embodiment of the utility model;

[0027] Figure 2 It is the positive structure diagram of the first kind of embodiment of the utility model;

[0028] Figure 3 It is the structure diagram of the second kind of embodiment of the utility model;

[0029] Figure 4 It is the structure diagram of the third kind of embodiment of the utility model.

[0030] In the drawing: 1, main body;11, connecting portion;12, installation portion;13, hollow structure;14, support portion;2, flexible stopper;21, assembly face. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the utility model will be explained in detail below in combination with drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the utility model, and do not constitute the limitation of the utility model.

[0032] As Figure 1 And Figure 2 Shown, a kind of flexible press jaw, including main body 1 and flexible stopper 2, main body 1 includes connecting portion 11 and support portion 14, support portion 14 protrudes in the first direction on the side wall of connecting portion 11;Flexible stopper 2 is connected with connecting portion 11, and flexible stopper 2 covers the lamination end of connecting portion 11 along the second direction;Wherein, film abuts on flexible stopper 2, and is folded and laminated on the outer wall of support portion 14 along the second direction. Main body 1 is the main part of flexible press jaw, and flexible stopper 2 is connected with main body 1, and is used to replace the place where main body 1 is excessively stressed to film;The first direction and the second direction referred to in the present application are respectively two mutually perpendicular directions of the section of main body 1, and the film abuts on flexible stopper 2, and is folded reversely around flexible stopper 2, and both ends of film abut on support portion 14, so that film lamination is more smooth and flat, to reduce the stress suffered by film.

[0033] Specifically, the main body 1 is composed of the connecting portion 11 and the supporting portion 14, the first direction is the width direction of the connecting portion 11, the second direction is the length direction of the connecting portion 11, the flexible stopper 2 is installed on the two sides of the connecting portion 11 along the second direction, that is, the contact end is the end of the connecting portion 11 in contact with the film, the flexible stopper 2 is used to replace the original contact end, and the flexible stopper 2 and the supporting portion 14 jointly act on the film on the periphery of the main body 1 to directly contact the film on the flexible stopper 2 and the supporting portion 14, thereby increasing the contact area of the film, avoiding the concentration of the pressure of the film, and preventing the film from being damaged due to folding.

[0034] As shown in Figure 1 and Figure 2 , as an embodiment of the present application, the connecting portion 11 and the supporting portion 14 are integrally formed, if the main body 1 is made of metal material, the connecting portion 11 and the supporting portion 14 are preferably integrally formed, such as casting, stamping, in addition, the supporting portion 14 can also be fixed on the connecting portion 11 by welding, but this method is easy to cause the supporting error of the film due to welding deviation, so the integrally formed is preferred.

[0035] As shown in Figures 1 to 4 , the connecting portion 11 has a hollow structure 13 for providing deformation, the connecting portion 11 of the present application is made of metal material, the hollow connecting portion 11 can save materials, and the connecting portion 11 can be deformed under the pressure of the film, when the film is over-tensioned, the connecting portion 11 with deformation can alleviate the tension of the film to prevent the film from being broken due to over-tension. Among them, the hollow structure 13 can adopt any shape, such as profile design according to the track of the connecting portion 11, so that the connecting portion 11 can be bent, or different thicknesses can be designed in different regions of the connecting portion 11 according to the requirement of deformation to form the final hollow structure 13.

[0036] As shown in Figure 1 and Figure 2 , as a first preferred embodiment of the present application, the cross section of the connecting portion 11 is double circular ring shape, that is, ∞ shape, when the connecting portion 11 is double circular ring shape, two mutually fixed connecting portions 11 are arranged in sequence along the second direction, and the two are connected by the mounting portion 12, the mounting portion 12 can be formed by welding or casting, the flexible stopper 2 is installed at the two ends of the connecting portion 11 along the second direction, the supporting portion 14 extends outwardly along the first direction, the supporting portion 14 is close to the flexible stopper 2, so that the flexible stopper 2 and the supporting portion 14 jointly contact and press the film, uniformly disperse the stress of the film and the connecting portion 11, and the middle part of the film does not contact the connecting portion 11 to prevent the film from being damaged due to tension, and the deformation provided by the hollow structure 13 further prevents the film from being damaged due to tension.

[0037] As shown in Figure 3 , as the second embodiment of the present application, the connecting part 11 adopts an I-shaped structure, the connecting part 11 is in a straight strip shape, the supporting part 14 is arranged at both ends of the connecting part 11 along the first direction, the supporting part 14 is arranged on both side walls of the connecting part 11 along the first direction, and the supporting part 14 can be arranged in multiple groups, in this embodiment, two groups of supporting parts 14 are preferably arranged, and the supporting parts 14 are symmetrically arranged with respect to the connecting part 11; the middle part of the connecting part 11 can also adopt a hollow structure 13 to improve the deformation ability of the supporting part 14.

[0038] As shown in Figure 4 , as the third embodiment of the present application, the connecting part 11 can adopt a convex shape, that is, the supporting part 14 protrudes outward from the middle part of the connecting part 11 to support the film, the flexible stopper 2 is arranged at both ends of the connecting part 11 along the second direction, and the flexible stopper 2 and the supporting part 14 jointly support and press the film on the periphery of the main body 1, the connecting part 11 can adopt a hollow structure 13 to improve the deformation ability of the supporting part 14; in this embodiment, only a single supporting part 14 is arranged in the middle part of the connecting part 11 along the first direction.

[0039] As shown in Figure 1 and Figure 2 , the flexible stopper 2 includes an assembly surface 21 fixed to the connecting part 11, and the edge of the assembly surface 21 is smoothly connected to the connecting part 11, wherein the assembly surface 21 is a surface for mutual fixation of the flexible stopper 2 and the connecting part 11, the edge of the assembly surface 21 is connected to the connecting part 11, so that the edge of the assembly surface 21 and the end of the connecting part 11 do not have a gap, thereby improving the tightness of the film lamination, as shown in Figure 4 , the connecting part 11 can be connected to the edge of the flexible stopper 2 in an arc-shaped track to reduce the gap.

[0040] As shown in Figures 2 to 4 , the assembly surface 21 at least partially extends to the hollow structure 13 of the connecting part 11, in order to improve the mounting effect of the flexible stopper 2 and the connecting part 11, the flexible stopper 2 and the connecting part 11 can be fixed in a clamping, bonding or vulcanization integrated manner, if the flexible stopper 2 extends into the hollow structure 13, the contact area of the flexible stopper 2 and the connecting part 11 can be increased, and the connection strength is further improved.

[0041] As shown in Figure 3 and Figure 4 , on the same side of the multiple supporting parts 14 along the second direction, the same side of the multiple supporting parts 14 is located on the same plane, wherein on one direction of the connecting part 11, the contact surface of the multiple supporting parts 14 and the film is located on the same plane, so as to ensure that the film is located on the same horizontal plane, improve the neatness of the film, and increase the contact area of the film and disperse the pressure of the film.

[0042] The connecting portion 11 and / or the supporting portion 14 are made of metal material, in the present application, the connecting portion 11 and the supporting portion 14 can be freely selected between plastic and metal, preferably both are made of metal to improve the structural strength and deformation capacity, the metal material can be aluminum, copper, stainless steel or alloy, etc., the cross section of the flexible stop block 2 can adopt an arc block, the arc surface is in contact with the film to disperse the pressure of the film, the flexible stop block 2 is selected according to the tensile strength of the diaphragm, mainly low-density foam, sponge, flexible silica gel, etc.

[0043] A laminating machine is installed with the flexible pressing jaw as described above, the laminating machine adopts Z-shaped lamination, and the flexible clamping jaw alternately presses the film, and the specific experimental operation is as follows:

[0044] Experiment 1:

[0045] The soft package battery with the model of 7mm*100mm*150mm, the capacity of 10Ah, the nominal voltage of 3.6V, the positive electrode of ternary NCM622, and the negative electrode of artificial graphite is selected. The positive electrode sheet has a length of 123mm, a width of 93mm, and a surface density of 400g / m2; the negative electrode sheet has a length of 126mm, a width of 96mm, and a surface density of 110g / m2. The diaphragm is a gel diaphragm with a thickness of 18um, and the tensile strength is only 14Mpa, which is 4.3% of the tensile strength of 320Mpa in the MD direction of the conventional diaphragm. The laminated positive electrode has 14 layers, and the laminated negative electrode has 15 layers.

[0046] The above positive and negative electrode sheets and diaphragm are assembled by using a semi-automatic laminating machine. During the laminating process, the flexible pressing jaw is inverted 8, which is elliptical, the thickness of the connecting portion 11 is 0.1-1mm, preferably 0.2mm; the material can be an alloy of stainless steel, copper, aluminum and other metal materials, preferably aluminum; the middle part of the connecting portion 11 is a hollow structure 13, so it also has some elasticity. The two sides of the connecting portion 11 have flexible stop blocks 2, mainly foam, sponge, flexible silica gel, etc., preferably foam. The diaphragm tension is set to 200N, the total width of the flexible pressing jaw is 20mm, the total thickness is 2mm, and the total length is 100mm.

[0047] The flexible pressing jaw is installed on the four pressing jaw stations of the laminating machine, and the laminating assembly is completed by 14 layers of positive electrodes, 15 layers of negative electrodes and 32 layers of diaphragms.

[0048] Comparative Example 1:

[0049] The soft package battery has a thickness of 7mm, a width of 100mm, a length of 150mm, a capacity of 10Ah, a nominal voltage of 3.6V, a positive electrode of ternary NCM622, and a negative electrode of artificial graphite. The positive electrode sheet has a length of 123mm, a width of 93mm, and a surface density of 400g / m2; the negative electrode sheet has a length of 126mm, a width of 96mm, and a surface density of 110g / m2. The separator is a gel separator with a thickness of 18um, and the tensile strength is only 14Mpa. The tensile strength of the conventional separator in the MD direction is 320Mpa, which is only 4.3% of that of the conventional separator. The number of positive electrode sheets is 14, and the number of negative electrode sheets is 15. The tension of the separator is set to 200N. The total width of the pressing jaw is 20mm, the total thickness is 1mm, and the total length is 100mm.

[0050] The above positive and negative electrode sheets and the separator are used to complete the lamination assembly by using a semi-automatic lamination machine. The conventional flat pressing jaw is used to start the lamination assembly with 14 layers of positive electrode sheets, 15 layers of negative electrode sheets, and 32 layers of separators.

[0051]

[0052] The results show that, compared with Comparative Example 1, since the flexible pressing jaw is used, the lamination operation of Experimental Example 1 can be normally completed when the separator with low tensile strength is used, while the separator of Comparative Example 1 is broken during lamination, and the lamination core cannot be produced.

[0053] The above only describes preferred embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation, direct / indirect application in other related technical fields under the utility model concept of the utility model, and the contents of the utility model specification and drawings are included in the patent protection range of the utility model.

Claims

1. A flexible pressure gripper, characterized in that, include: The main body (1) includes: Connecting part (11); The support portion (14) protrudes from the side wall of the connecting portion (11) in a first direction; A flexible stop (2) is connected to the connecting part (11), and the flexible stop (2) covers the fitting end of the connecting part (11) along the second direction; The film abuts against the flexible stop (2) and is folded and adhered to the outer wall of the support (14) in the second direction.

2. The flexible pressure gripper as described in claim 1, characterized in that, The connecting part (11) and the supporting part (14) are integrally formed.

3. The flexible pressure gripper as described in claim 1, characterized in that, The connecting part (11) has a hollow structure (13).

4. The flexible pressure gripper as described in claim 1, 2, or 3, characterized in that, The cross-section of the connecting part (11) is double-ring, I-shaped or convex.

5. The flexible pressure gripper as described in claim 4, characterized in that, When the connecting part (11) is a double ring, the two connecting parts (11) that are fixed to each other are arranged in sequence along the second direction.

6. The flexible pressure gripper as described in claim 3, characterized in that, The flexible stop (2) includes an assembly surface (21) fixed to the connecting part (11), and the edge of the assembly surface (21) smoothly transitions with the connecting part (11).

7. The flexible pressure gripper as described in claim 6, characterized in that, The mounting surface (21) has at least a hollow structure (13) that extends partially to the connecting portion (11).

8. The flexible pressure gripper as described in claim 1, characterized in that, Along the second direction, the same side of the plurality of support portions (14) is located on the same plane.

9. The flexible pressure gripper as described in claim 1, characterized in that, The connecting part (11) and the supporting part (14) are integrally formed.

10. A stacking machine, characterized in that, The stacking machine is equipped with flexible pressure claws as described in any one of claims 1 to 9.

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