Thermal compounding and iron removing integrated lamination device for improving diaphragm wrinkles

Abstract

The utility model provides a thermal compounding and iron removal integrated lamination device for improving diaphragm wrinkles, which is suitable for products to be laminated. Comprising a guide rail, a movable lamination table arranged on the guide rail, a positive electrode upper pressing mechanism arranged above the movable lamination table, a negative electrode upper pressing mechanism arranged above the movable lamination table and a diaphragm conveying mechanism, the diaphragm conveying mechanism is arranged between the positive electrode upper pressing mechanism and the negative electrode upper pressing mechanism; the negative electrode upper pressing mechanism comprises a first upper pressing metal plate, a plurality of first suction cups used for adsorbing the products to be laminated to the movable lamination table and a plurality of circles of first electrified coils annularly arranged on the outer side face of the first upper pressing metal plate, and the first suction cups are evenly arranged on the first upper pressing metal plate in a penetrating mode. According to the invention, the integration of thermal compounding between the diaphragm and the pole piece and iron removal of the pole piece is realized by utilizing the phenomena of eddy current heating and electricity-to-magnetism, so that the production efficiency is improved, and the equipment cost investment of a factory is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium ion batteries, and in particular relates to a thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles. Background Art

[0002] In the production process of lithium-ion batteries, after the pole pieces are produced, the positive pole pieces, negative pole pieces and diaphragms are usually assembled into bare cells by winding or laminating. However, regardless of whether winding or laminating is used, a certain tension must be applied to the diaphragm to increase the amount of shrinkage of the diaphragm along the belt direction, resulting in the appearance of the bare cell being uneven and the internal diaphragm wrinkling after the glue is unloaded, which in turn causes quality problems such as low battery capacity and poor cycle performance. In addition, if the pole piece contains iron powder, during the charging process of the lithium-ion battery, the iron on the positive electrode will be oxidized and reduced at the negative electrode to form dendritic iron dendrites. The iron dendrites can easily pierce the diaphragm, causing thermal runaway. Excessive iron content will also seriously deteriorate the cycle performance of the lithium-ion battery.

[0003] At present, in the production process of lithium-ion batteries, the process of thermally compounding the pole piece and the diaphragm is often used to tightly bond the pole piece and the diaphragm together, so as to improve the uneven appearance of the bare battery cell and the wrinkles of the diaphragm.

[0004] Patent application CN108878984A discloses a lithium battery thermal composite Z-shaped stacking device and stacking method. Although the entire Z-shaped stacking process has a high degree of automation, the device and stacking method are complicated to operate. The production of a bare battery cell requires secondary stacking and secondary thermal composite, the flow time between processes is long, and the production efficiency is low.

[0005] Patent application CN115663263A discloses a thermal composite lamination device, in which the first rolling assembly first rolls the positive and negative electrode sheets onto the diaphragm, and then the second rolling assembly rolls the single-layer laminations output by at least two lamination devices after being rolled by the first rolling assembly for a second time to obtain a multi-layer lamination, which improves production efficiency to a certain extent. However, the lamination device uses many and complex components, and an additional iron removal device is required, and the thermal composite and rolling devices are not integrated. Utility Model Content

[0006] The embodiment of the utility model provides an integrated thermal compound and iron removal lamination device for improving diaphragm wrinkles, aiming to solve the problems of internal diaphragm wrinkles, separate settings of thermal compound and iron removal devices, and inconvenience in use during the production process of lithium batteries.

[0007] In order to solve the above problems, the embodiment of the utility model provides a thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles, which is suitable for products to be laminated, including a guide rail, a movable lamination platform arranged on the guide rail, a positive electrode pressing mechanism arranged above the movable lamination platform, a negative electrode pressing mechanism arranged above the movable lamination platform, and a diaphragm conveying mechanism; the diaphragm conveying mechanism is arranged between the positive electrode pressing mechanism and the negative electrode pressing mechanism;

[0008] The negative electrode pressing mechanism includes a first pressing metal plate, several first suction cups for adsorbing the products to be stacked onto the movable stacking table, and several circles of first energized coils arranged on the outer surface of the first pressing metal plate, and several first suction cups are evenly arranged on the first pressing metal plate.

[0009] As a preferred embodiment, several turns of the first energized coils are arranged in parallel with each other; the first energized coils are AC energized coils that have been insulated. The eddy current size inside the first upper pressing metal plate can be adjusted by adjusting the frequency of the AC power of the first energized coils, thereby adjusting the temperature of the first upper pressing metal plate.

[0010] As a preferred embodiment, the integrated thermal composite and iron removal lamination device also includes a plurality of pressing claws for fixing the product to be laminated; when the integrated thermal composite and iron removal lamination device is in working state, the product to be laminated is placed on the movable lamination table, and the plurality of pressing claws are respectively arranged on the end corners of the product to be laminated through mechanical arms.

[0011] As a preferred embodiment, the positive electrode pressing mechanism includes a second pressing metal plate, several second suction cups for adsorbing the products to be stacked onto the movable stacking table, and several circles of second energized coils arranged on the outer surface of the second pressing metal plate, and several second suction cups are evenly arranged on the second pressing metal plate.

[0012] As a preferred embodiment, several turns of the second energized coils are arranged in parallel with each other; the second energized coils are AC energized coils that have been insulated. The eddy current size inside the second upper pressing metal plate can be adjusted by adjusting the frequency of the AC power of the second energized coils, thereby regulating the temperature of the second upper pressing metal plate.

[0013] As a preferred embodiment, the diaphragm conveying mechanism includes a diaphragm, an inflatable shaft, a tension roller and a first buoyancy roller; the diaphragm is wound around the inflatable shaft, and the free end of the diaphragm is sequentially wound around the tension roller and the first buoyancy roller, the tension roller abuts against one side surface of the diaphragm, and the first buoyancy roller abuts against the other side surface of the diaphragm.

[0014] As a preferred embodiment, the diaphragm conveying mechanism further includes a second buoyancy roller, which is disposed between the air shaft and the tension roller; the second buoyancy roller and the first buoyancy roller are both in contact with the same side of the diaphragm.

[0015] As a preferred embodiment, the diaphragm conveying mechanism also includes a third buoyancy roller and a fourth buoyancy roller arranged opposite to each other, and the free end of the diaphragm is arranged between the third buoyancy roller and the fourth buoyancy roller; the fourth buoyancy roller and the first buoyancy roller are both abutted on the same side of the diaphragm; the third buoyancy roller and the tension roller are abutted on the same side of the diaphragm.

[0016] As a preferred embodiment, the positive electrode pressing mechanism and the negative electrode pressing mechanism are symmetrically arranged; and the positive electrode pressing mechanism and the negative electrode pressing mechanism have the same structure.

[0017] As a preferred embodiment, the movable lamination platform is slidably connected to the guide rail; the products to be laminated are one or at least two of positive electrode sheets, negative electrode sheets, diaphragms or bare cells.

[0018] The device of the utility model has the following beneficial effects compared with the prior art: The utility model discloses a thermal compounding and iron removal integrated lamination device for improving the diaphragm wrinkles, and uses the eddy current generated by electromagnetic induction to heat the upper pressing metal plate of the Z-shaped lamination device, so that each pole piece in the lamination process can be evenly thermally compounded with the diaphragm, which can effectively improve the wrinkling phenomenon of each layer of diaphragm, avoid the uneven temperature inside the bare battery cell and incomplete elimination of diaphragm wrinkles caused by hot pressing the bare battery cell as a whole after lamination, realize the integration of thermal compounding and pressurization, and help improve production efficiency. In addition, by utilizing the electromagnetism phenomenon, the pole piece is de-ironed while the lamination is thermally compounded, which reduces the cost of adding an additional iron removal device, realizes the integration of thermal compounding and iron removal, and improves the cycle performance of lithium-ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a front view structural schematic diagram of a thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles according to an embodiment of the present application.

[0021] Figure 2 yes Figure 1Schematic diagram of the structure of the negative electrode pressing mechanism. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0027] Specifically, Figure 1 to Figure 2As shown, the embodiment of the utility model proposes a thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles, which is suitable for the product A to be laminated, including a guide rail 10, a movable lamination platform 20 arranged on the guide rail 10, a positive electrode pressing mechanism 30 arranged above the movable lamination platform 20, a negative electrode pressing mechanism 40 arranged above the movable lamination platform 20, and a diaphragm conveying mechanism 50; the diaphragm conveying mechanism 50 is arranged between the positive electrode pressing mechanism 30 and the negative electrode pressing mechanism 40;

[0028] The negative electrode pressing mechanism 40 includes a first pressing metal plate 41, several first suction cups 42 for adsorbing the product A to be stacked onto the movable stacking table 20, and several circles of first energized coils 43 arranged on the outer surface of the first pressing metal plate 41, and several first suction cups 42 are evenly arranged on the first pressing metal plate 41.

[0029] As a preferred embodiment, several circles of the first energized coils 43 are arranged in parallel with each other; the first energized coils 43 are AC energized coils that have been insulated. The eddy current size inside the first upper pressing metal plate 41 can be adjusted by adjusting the frequency of the AC power of the first energized coils 43, so that the temperature of the first upper pressing metal plate 41 can be controlled.

[0030] As a preferred embodiment, the integrated thermal composite and iron removal lamination device also includes a plurality of pressing claws 60 for fixing the product A to be laminated; when the integrated thermal composite and iron removal lamination device is in working state, the product A to be laminated is placed on the movable lamination table 20, and the plurality of pressing claws 60 are respectively arranged on the end corners of the product A to be laminated through mechanical arms (not marked in the figure).

[0031] As a preferred embodiment, the positive electrode pressing mechanism 30 includes a second pressing metal plate 31, several second suction cups 32 for adsorbing the product A to be stacked onto the movable stacking table 20, and several circles of second energized coils 33 arranged on the outer surface of the second pressing metal plate 31, and several second suction cups 32 are evenly arranged on the second pressing metal plate 31.

[0032] As a preferred embodiment, several turns of the second power-carrying coils 33 are arranged in parallel with each other; the second power-carrying coils 33 are AC power-carrying coils that have been insulated. The eddy current size inside the second upper pressing metal plate 31 can be adjusted by adjusting the frequency of the AC power of the second power-carrying coils 33, so that the temperature of the second upper pressing metal plate 31 can be controlled.

[0033] As a preferred embodiment, the diaphragm conveying mechanism 50 includes a diaphragm 51, an inflatable shaft 52, a tension roller 53 and a first buoyancy roller 54; the diaphragm 51 is wound around the inflatable shaft 52, and the free end of the diaphragm 51 is sequentially wound around the tension roller 53 and the first buoyancy roller 54, the tension roller 53 abuts against one side surface of the diaphragm 51, and the first buoyancy roller 54 abuts against the other side surface of the diaphragm 51.

[0034] As a preferred embodiment, the diaphragm conveying mechanism 50 further includes a second buoyancy roller 55 , which is disposed between the air shaft 52 and the tension roller 53 ; the second buoyancy roller 55 and the first buoyancy roller 54 are both in contact with the same side of the diaphragm 51 .

[0035] As a preferred embodiment, the diaphragm conveying mechanism 50 also includes a third buoyancy roller 56 and a fourth buoyancy roller 57 that are relatively arranged, and the free end of the diaphragm 51 is arranged between the third buoyancy roller 56 and the fourth buoyancy roller 57; the fourth buoyancy roller 57 and the first buoyancy roller 54 are both in contact with the same side of the diaphragm 51; the third buoyancy roller 56 and the tension roller 53 are in contact with the same side of the diaphragm 51.

[0036] As a preferred embodiment, the positive electrode pressing mechanism 30 and the negative electrode pressing mechanism 40 are symmetrically arranged; and the positive electrode pressing mechanism 30 and the negative electrode pressing mechanism 40 have the same structure.

[0037] As a preferred embodiment, the movable lamination platform 20 is slidably connected to the guide rail 10; the product A to be laminated is one or at least two of a positive electrode sheet, a negative electrode sheet, a diaphragm or a bare battery cell.

[0038] In the embodiment of the present application, the positive electrode pressing mechanism 30, the negative electrode pressing mechanism 40 and the diaphragm conveying mechanism 50 can be fixed by a robot arm respectively, or can be fixed by other existing fixing devices.

[0039] When the integrated lamination device for thermal compounding and iron removal of the present application is used for lamination, the operation can be performed according to the following workflow:

[0040] (1) The movable lamination table 20 is moved to the position directly below the negative electrode pressing mechanism 40, and the diaphragm 51 is conveyed to the movable lamination table 20 by the diaphragm conveying mechanism 50 to obtain the diaphragm; the diaphragm is fixed by the pressing claw 60;

[0041] (2) A negative electrode sheet is sucked from the negative electrode sheet material slot by the first suction cup 42 on the negative electrode pressing mechanism 40 and placed on the diaphragm, the mechanical arm is controlled to remove the pressing claw 60, and the first pressing metal plate 41 is controlled by the mechanical arm to fall to the surface of the negative electrode sheet, and the eddy current generated by electromagnetic induction inside the first pressing metal plate 41 wound with the first energized coil 43 is used to achieve thermal recombination between the negative electrode sheet and the diaphragm, and at the same time, the electromagnetism generated by the first energized coil 43 is used to remove iron from the surface of the negative electrode sheet;

[0042] (3) The first upper pressing metal plate 41 is controlled by the robot arm to move upward to separate the first upper pressing metal plate 41 from the negative electrode sheet, and the pressing claw 60 is controlled by the robot arm to be fixed on the end corner of the stacked part of the electrode sheet; the first suction cup 42 is moved upward to separate from the stacked negative electrode sheet;

[0043] (4) The movable lamination table 20 is moved to the position directly below the positive electrode pressing mechanism 30, and at the same time, the diaphragm conveying mechanism 50 covers the negative electrode sheet already laminated on the movable lamination table 20 with the diaphragm 51;

[0044] (5) A positive electrode sheet is sucked from the positive electrode sheet material slot by the second suction cup 32 on the positive electrode pressing mechanism 30 and placed on the diaphragm, the mechanical arm is controlled to remove the pressing claw 60, and the second pressing metal plate 31 is controlled by the mechanical arm to fall to the surface of the positive electrode sheet, and the eddy current generated by electromagnetic induction inside the second pressing metal plate 31 wound with the second energized coil 33 is used to achieve thermal recombination between the positive electrode sheet and the diaphragm, and at the same time, the electromagnetism generated by the second energized coil 33 is used to remove iron from the surface of the positive electrode sheet;

[0045] (6) The second upper pressing metal plate 31 is controlled by the robot arm to move upward to separate the second upper pressing metal plate 31 from the positive electrode sheet, and the pressing claw 60 is controlled by the robot arm to be fixed on the end corner of the stacked part of the electrode sheet; the second suction cup 32 is moved upward to separate from the stacked positive electrode sheet;

[0046] (7) Repeat steps (1) to (6) until a complete bare cell is obtained.

[0047] The utility model discloses a thermal compounding and iron removal integrated lamination device for improving the diaphragm wrinkles, which utilizes the eddy current generated by electromagnetic induction to heat the upper pressing metal plate of the Z-shaped lamination device, so that each pole piece in the lamination process can be uniformly thermally compounded with the diaphragm, which can effectively improve the wrinkling phenomenon of each layer of the diaphragm, avoid the phenomenon of uneven temperature inside the bare battery cell and incomplete elimination of diaphragm wrinkles caused by hot pressing the bare battery cell as a whole after the lamination is completed, realize the integration of thermal compounding and pressurization, and help improve production efficiency. In addition, by utilizing the electromagnetism phenomenon, the pole piece is de-ironed while the lamination is thermally compounded, which reduces the cost of adding an additional iron removal device, realizes the integration of thermal compounding and iron removal, and improves the cycle performance of lithium-ion batteries.

[0048] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles, suitable for products to be laminated, characterized in that: It comprises a guide rail, a movable lamination platform arranged on the guide rail, a positive electrode pressing mechanism arranged above the movable lamination platform, a negative electrode pressing mechanism arranged above the movable lamination platform, and a diaphragm conveying mechanism; the diaphragm conveying mechanism is arranged between the positive electrode pressing mechanism and the negative electrode pressing mechanism; The negative electrode pressing mechanism includes a first pressing metal plate, several first suction cups for adsorbing the products to be stacked onto the movable stacking table, and several circles of first energized coils arranged on the outer surface of the first pressing metal plate, and several first suction cups are evenly arranged on the first pressing metal plate.

2. The thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles according to claim 1 is characterized in that: Several turns of the first energized coil are arranged in parallel with each other; the first energized coil is an AC energized coil that has been insulated.

3. The thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles according to claim 2 is characterized in that: The integrated thermal compounding and iron removal lamination device also includes a plurality of pressing claws for fixing the product to be laminated; when the integrated thermal compounding and iron removal lamination device is in working state, the product to be laminated is placed on the movable lamination table, and the plurality of pressing claws are respectively arranged on the end corners of the product to be laminated through mechanical arms.

4. The thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles according to claim 3 is characterized in that: The positive electrode pressing mechanism includes a second pressing metal plate, several second suction cups for adsorbing the products to be stacked onto the movable stacking table, and several circles of second energized coils arranged on the outer surface of the second pressing metal plate, and several second suction cups are evenly arranged on the second pressing metal plate.

5. The thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles according to claim 4 is characterized in that: Several turns of the second energized coil are arranged in parallel with each other; the second energized coil is an AC energized coil that has been insulated.

6. The thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles according to claim 5 is characterized in that: The diaphragm conveying mechanism includes a diaphragm, an inflatable shaft, a tension roller and a first buoyancy roller; the diaphragm is wound around the inflatable shaft, and the free end of the diaphragm is sequentially wound around the tension roller and the first buoyancy roller, the tension roller abuts against one side surface of the diaphragm, and the first buoyancy roller abuts against the other side surface of the diaphragm.

7. The thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles according to claim 6 is characterized in that: The membrane conveying mechanism further includes a second buoyancy roller, which is disposed between the air shaft and the tension roller; the second buoyancy roller and the first buoyancy roller are both in contact with the same side of the membrane.

8. The thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles according to claim 7 is characterized in that: The diaphragm conveying mechanism also includes a third buoyancy roller and a fourth buoyancy roller arranged opposite to each other, the free end of the diaphragm is arranged between the third buoyancy roller and the fourth buoyancy roller; the fourth buoyancy roller and the first buoyancy roller are both in contact with the same side of the diaphragm; the third buoyancy roller and the tension roller are in contact with the same side of the diaphragm.

9. The thermal composite and iron removal integrated lamination device for improving diaphragm wrinkles according to claim 1 is characterized in that: The positive electrode pressing mechanism and the negative electrode pressing mechanism are symmetrically arranged; and the positive electrode pressing mechanism and the negative electrode pressing mechanism have the same structure.

10. The integrated lamination device for thermal compounding and iron removal for improving diaphragm wrinkles according to claim 1, characterized in that: The movable lamination platform is slidably connected to the guide rail; the products to be laminated are one or at least two of positive electrode sheets, negative electrode sheets, diaphragms or bare cells.

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