CN212113909U - A lamination device for improving the folds of lithium-ion battery separators - Google Patents

Abstract

The utility model relates to a lamination device for improving the folds of a lithium ion battery diaphragm, which comprises a body, and the body is provided with a positive electrode sheet feeding device, a negative electrode sheet feeding device, a diaphragm unwinding mechanism, a roller set and a moving lamination two diaphragm smoothing rollers are movably arranged on the body between the positive electrode sheet feeding device and the negative electrode sheet feeding device, and the diaphragm smoothing rollers are located above the moving lamination table and reciprocate up and down relative to the moving lamination table Movement to smooth out folds in the diaphragm during lamination. The utility model provides a lamination device for improving the folds of the diaphragm of the lithium ion battery, which can improve the folds of the diaphragm during the lamination process of the lithium ion battery and improve the quality of the electric core.

Description

A lamination device for improving the folds of lithium-ion battery separators

technical field

The utility model relates to the technical field of lithium battery manufacturing equipment, in particular to a lamination device for improving the folds of a lithium ion battery diaphragm.

Background technique

Lithium-ion soft pack batteries have the characteristics of good safety performance, light weight, high capacity, high energy density, and flexible design. Relying on the advantages of high energy density and high safety, the use of lithium-ion pouch power batteries in new energy vehicles has been rapidly promoted, and the market share of pouch power batteries has continued to increase.

Lithium-ion power batteries have large capacity, and are mostly produced by lamination in the production process. That is, after the positive and negative pole pieces are corrected by positioning, they are transferred to the lamination table, placed on the pressed diaphragm, and then passed through the lamination table. Move to the other end, and naturally pull the diaphragm to cover the pole piece, so that the diaphragm moves in a zigzag shape. By placing the positive and negative plates respectively, and moving repeatedly, after the core package reaches the required number of layers, cut off the diaphragm to obtain the required number of layers. product. When using the traditional lamination production process, the lamination machine mainly relies on the weight of the floating roller to control the tension of the diaphragm. This control method cannot ensure that the tension of the diaphragm continues to be constant. Once the control speed of the diaphragm tension cannot keep up with the speed of the lamination , it will cause the diaphragm stacked into the core package to be uneven, the diaphragm will be wrinkled, and the quality of the battery will be affected.

At present, the company produces a battery cell with a long length (greater than 400mm). Due to the long length of this type of lithium-ion battery and the wide diaphragm, the existing equipment cannot be effective in the lamination process during the production of the lamination process. Controlling the tension and flatness of the diaphragm makes it easy for the diaphragm to wrinkle during the lamination process, and the later production cannot eliminate the wrinkle of the diaphragm, which affects the quality of the cell.

Utility model content

In order to solve the deficiencies of the prior art, the utility model provides a lamination device for improving the folds of the lithium ion battery diaphragm, so as to improve the folds produced during the lamination process and improve the quality of the battery cells. In order to achieve the above object, the technical scheme of the present utility model is achieved in this way:

A lamination device for improving the folds of a lithium ion battery diaphragm, comprising a body, the body is provided with a positive electrode sheet feeding device, a negative electrode sheet feeding device, a diaphragm unwinding mechanism and a roller set; the diaphragm unwinding mechanism and The roller group is arranged on the upper end of the body, the diaphragm unwinding mechanism is placed with a coiled diaphragm, the coiled diaphragm is unwound through the diaphragm unwinding mechanism, and then the tension is released through the roller group; the bottom of the body is provided with a moving stack. The sheet table, the positive electrode sheet feeding device and the negative electrode sheet feeding device are all arranged above the moving lamination table, the positive electrode sheet feeding device and the negative electrode sheet feeding device are reciprocating up and down, back and forth, the moving stack The sheet table can be moved to the right under the positive electrode sheet feeding device and the negative electrode sheet feeding device through left and right reciprocating motion; two diaphragm smoothing rollers are movably arranged on the body between the positive electrode sheet feeding device and the negative electrode sheet feeding device , the two diaphragm smoothing rollers are arranged in parallel on the left and right, and the two diaphragm smoothing rollers are located above the moving lamination stage and reciprocate up and down relative to the moving lamination stage; the moving lamination stage is movably arranged to clamp the diaphragm the U clip.

Further, the moving lamination stage includes a lamination stage body, left and right servos, slide rails and support columns, the left and right servos are arranged at the bottom of the body, and the output shafts of the left and right servos are connected with horizontally arranged slide rails. The lamination table body is fixed on the upper end of the support column, the lower end of the support column is movably connected to the slide rail, and the left and right servo controls the support column to reciprocate left and right on the slide rail, thereby controlling the lamination stage body to move to the positive electrode sheet feeding device and the Directly below the negative electrode feeding device.

Further, the U clip is movably arranged on the lamination stage body, and two U clips are respectively provided at the front end and the rear end of the lamination stage body.

Further, the two diaphragm smoothing rollers are respectively movably arranged on the body through a bracket.

Further, the front-to-rear width of the diaphragm smoothing roller is equal to or wider than the front-to-rear width of the diaphragm.

Further, a plurality of colloidal particles are evenly arranged on the diaphragm smoothing roller.

Further, the body of the lamination table is also provided with a diaphragm cutting device, and after the lamination is completed, the last layer of diaphragm is cut off.

Further, the diaphragm cutting device adopts a thermal cutting method to cut the diaphragm, and the diaphragm cutting device includes an upper and lower servo, a resistance wire and a temperature control system, and the upper and lower servo controls the resistance wire to reciprocate up and down relative to the lamination table body, The temperature control system is connected with the resistance wire and controls the heating of the resistance wire.

Compared with the prior art, the lamination device for improving the folds of the diaphragm of a lithium ion battery provided by the present invention has the following advantages: when producing a battery cell with a longer cell length and a wider diaphragm, the tension of the incoming material of the diaphragm is not high; Evenly, it is easy to cause the diaphragm to wrinkle. By setting the diaphragm smoothing roller to smooth the diaphragm, the wrinkle problem can be well improved.

Description of drawings

The accompanying drawings that constitute a part of the present invention are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

Fig. 1 is the front view of the overall structure of the utility model;

Figure 2 is a top view of the lamination table body;

The up and down, left and right, and front and back mentioned in this article are all based on the up and down, left and right, and front and back indicated in the accompanying drawings;

Description of reference numerals: 1-body; 2-diaphragm unwinding mechanism; 3-diaphragm; 4-roller set; 5-support; 6-diaphragm smoothing roller; 7-support column; 8-slide rail; 9-left and right Servo; 10-U clip; 11- Lamination table body; 12- Positive electrode sheet feeding device; 13- Positive electrode sheet; 14- Negative electrode sheet feeding device; 15- Negative electrode sheet.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the drawings. The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a reference to the present invention. Create limitations. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or It can be connected in one piece; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

A lamination device for improving the folds of a lithium-ion battery diaphragm, as shown in Figures 1 to 2, includes a body 1, and the body 1 is provided with a positive electrode sheet feeding device 12, a negative electrode sheet feeding device 14, and a diaphragm unwinding. Mechanism 2 and roller group 4; the diaphragm unwinding mechanism 2 and the roller group 4 are arranged on the upper end of the body 1, the diaphragm unwinding mechanism 2 is placed with a rolled diaphragm 3, and the rolled diaphragm 3 is released through the diaphragm. The roll mechanism 2 is unwound, and then the tension is released through the roller group 4; the bottom of the body 1 is provided with a moving lamination table, and the positive electrode sheet feeding device 12 and the negative electrode sheet feeding device 14 are both arranged above the moving lamination table. , the positive electrode sheet feeding device 12 and the negative electrode sheet feeding device 14 reciprocate up and down, back and forth; the moving lamination table includes the lamination table body 11, the left and right servos 9, the slide rails 8 and the support columns 7, so The left and right servos 9 are arranged at the bottom of the body 1, the output shafts of the left and right servos 9 are connected with horizontally arranged slide rails 8, the lamination table body 11 is fixed on the upper end of the support column 7, and the lower end of the support column 7 is movably connected to the upper end of the support column 7. On the slide rail 8, the slide rail 8 is a lead screw, and the left and right servos 9 control the support column 7 to reciprocate left and right on the slide rail 8 through forward and reverse rotation, thereby controlling the lamination table body 11 to move to the positive electrode sheet feeding. The device 12 and the negative electrode sheet feeding device 14 are directly below; two U clips 10 are respectively provided at the front and rear ends of the lamination stage body 11. At 11:00, the U clip 10 presses the diaphragm 3, the positive electrode sheet 13 or the negative electrode sheet 15 in the order of "out→up→in→down"; the lamination table body 11 is also provided with a diaphragm cutting device, the diaphragm The cutting device cuts off the diaphragm 3 by means of thermal cutting. The diaphragm cutting device includes an upper and lower servo, a resistance wire and a temperature control system. The upper and lower servo controls the resistance wire to reciprocate up and down relative to the lamination table body 11. The resistance wire is connected and the temperature of the resistance wire is controlled. After the lamination is completed, the diaphragm cutting device cuts off the last layer of diaphragm 3 .

Two diaphragm smoothing rollers 6 are movably arranged on the body 1 between the positive electrode sheet feeding device 12 and the negative electrode sheet feeding device 14 , the two diaphragm smoothing rollers 6 are arranged in parallel on the left and right, and the two diaphragm smoothing rollers 6 The two diaphragm smoothing rollers 6 are located above the moving lamination stage and reciprocate up and down relative to the moving lamination stage to smooth the diaphragm 3 during the lamination process. wrinkle; the width in the front-rear direction of the diaphragm smoothing roller 6 is equal to or wider than the width in the front-rear direction of the diaphragm 3; the diaphragm smoothing roller 6 is evenly provided with a plurality of colloidal particles, which can further improve the diaphragm smoothing roller 6 Smoothing effect on diaphragm 3.

When in use, the diaphragm 3 passes between the two diaphragm smoothing rollers 6, and then spreads on the lamination table body 11. The U clip 10 clamps the first layer of diaphragm 3. When the lamination table body 11 moves to the right, the right The diaphragm smoothing roller 6 on the side lowers and presses the diaphragm 3, and the movement of the diaphragm 3 drives the rotation of the diaphragm smoothing roller 6, thereby smoothing the wrinkles of the diaphragm 3; A negative electrode sheet 15 is placed on the diaphragm 3 of the lower stacking table body 11, and the U clip 10 presses the negative electrode sheet 15 and the diaphragm 3 in the order of "out→up→in→down". The feeding device 14 returns to the position of taking the film upwards and backwards; when the lamination table body 11 moves to the left, the right diaphragm smoothing roller 6 is reset, the left diaphragm smoothing roller 6 falls, and the next layer of diaphragm 3 is smoothed ; Then the positive electrode sheet feeding device 12 puts a positive electrode sheet 13 on the stacking table body 11 forward and downward, and then the U clip 10 presses the stacked on the The negative electrode sheet 15 , the separator 3 and the positive electrode sheet 13 on the lamination table body 11 . The above process is repeated, and when the number of laminated layers reaches the set requirement, the diaphragm cutting device heats the resistance wire to cut off the last layer of diaphragm 3 .

The utility model is provided with a diaphragm smoothing roller 6, which can smooth out the wrinkles of the diaphragm 3 caused by the uneven tension of the diaphragm 3 during the lamination process, greatly improve the problem of the diaphragm 3 wrinkle in the lamination process, and realize the core-packed diaphragm after lamination. 3 Flat, improve the quality of the battery.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the within the scope of protection of the present invention.

Claims (8)

1. A lamination device for improving the folds of the diaphragm of a lithium ion battery, comprising a body (1), on which the body (1) is provided with a positive electrode sheet feeding device (12), a negative electrode sheet feeding device (14), and a diaphragm discharge device; A coiling mechanism (2) and a roller group (4); the diaphragm unwinding mechanism (2) and the roller group (4) are arranged on the upper end of the body (1), and a coil is placed on the diaphragm unwinding mechanism (2). The installed diaphragm (3), the coiled diaphragm (3) is unwound through the diaphragm unwinding mechanism (2), and then the tension is released through the roller set (4); it is characterized in that: the bottom of the body (1) is provided with a moving Stacking table, the positive electrode sheet feeding device (12) and the negative electrode sheet feeding device (14) are both arranged above the moving stacking table, the positive electrode sheet feeding device (12) and the negative electrode sheet feeding device (14) ) are reciprocating up and down, back and forth, and the moving lamination stage moves to the positive electrode sheet feeding device (12) and the negative electrode sheet feeding device (14) directly under the positive electrode sheet feeding device (14) through the left and right reciprocating motion; the positive electrode sheet feeding device (12) ) and the negative electrode sheet feeding device (14), two diaphragm smoothing rollers (6) are movably arranged on the body (1), the two diaphragm smoothing rollers (6) are arranged in parallel on the left and right, and the two diaphragm smoothing rollers (6). (6) Both are located above the moving lamination stage and reciprocate up and down relative to the moving lamination stage; the moving lamination stage is movably provided with a U clip (10) for clamping the diaphragm (3). 2 . The lamination device for improving the folds of the lithium ion battery diaphragm according to claim 1 , wherein the movable lamination stage comprises a lamination stage body ( 11 ), left and right servos ( 9 ), slide rails ( 2 . 3 . 8) and a support column (7), the left and right servos (9) are arranged at the bottom of the body (1), the output shafts of the left and right servos (9) are connected with horizontally arranged slide rails (8), and the lamination stage The main body (11) is fixed on the upper end of the support column (7), the lower end of the support column (7) is movably connected to the slide rail (8), and the left and right servos (9) control the support column (7) to act on the slide rail (8). Left and right reciprocating motions, so as to control the lamination stage body (11) to move directly below the positive electrode sheet feeding device (12) and the negative electrode sheet feeding device (14). 3. The lamination device for improving the folds of the lithium ion battery diaphragm according to claim 2, wherein the U clip (10) is movably arranged on the lamination stage body (11), and the lamination stage body ( 11) The front and rear ends are respectively provided with two U clips (10). 4. A lamination device for improving the folds of a lithium ion battery diaphragm according to claim 1, wherein the two diaphragm smoothing rollers (6) are respectively movably arranged on the body (1) through a bracket (5). . 5. A lamination device for improving the folds of a lithium ion battery diaphragm according to claim 1, wherein the front and rear width of the diaphragm smoothing roller (6) is equal to or wider than the front and rear width of the diaphragm (3). 3) front and rear width. 6 . The lamination device for improving the folds of a lithium ion battery diaphragm according to claim 1 , wherein a plurality of colloidal particles are evenly arranged on the diaphragm smoothing roller ( 6 ). 7 . 7. A lamination device for improving the folds of a lithium ion battery diaphragm according to claim 2, characterized in that: the lamination table body (11) is also provided with a diaphragm cutting device, and after lamination is completed, the final A layer of diaphragm (3) is cut. 8. A lamination device for improving the folds of a lithium-ion battery diaphragm according to claim 7, characterized in that: the diaphragm cutting device cuts the diaphragm (3) by means of thermal cutting, and the diaphragm cutting device comprises an upper and lower servo , A resistance wire and a temperature control system, the upper and lower servo control resistance wire reciprocates up and down relative to the lamination table body (11), and the temperature control system is connected with the resistance wire and controls the temperature rise of the resistance wire.

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