Lamination mechanism of lithium ion battery

Abstract

The utility model discloses a lamination mechanism of a lithium ion battery, which belongs to the technical field of battery lamination and comprises a piece conveying component, a piece stacking component and a piece stacking component, a pressing cutter is arranged on each of the two sides of the surface of the lamination table in the transmission direction of the pole piece units; the sheet feeding assembly is arranged between the sheet conveying assembly and the sheet stacking table; the sheet feeding assembly comprises two sheet feeding rollers with opposite rotating directions, and a sheet passing gap is reserved between the two sheet feeding rollers; the pole piece conveying assembly conveys the pole piece units from the pole piece conveying assembly to the lamination table through the pole piece passing gap; the lifting assembly is connected with the lamination table and enables the lamination table to move up and down; and the translation assembly is connected with the lifting assembly and enables the lamination table to translate back and forth along with the lifting assembly in the transmission direction of the pole piece units. According to the utility model, the pole pieces are transferred by the piece feeding rollers instead of a traditional clamping jaw mechanism, so that the piece feeding process is simplified, and the piece laminating efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery stacking, in particular to a stacking mechanism for a lithium ion battery. Background Art

[0002] Lithium-ion batteries are currently widely used in 3C digital, new energy vehicles and energy storage industries. In the production process of lithium-ion batteries, there are two main methods for preparing core packages: stacking process and winding process. The advantages of winding process: high production efficiency and good control of pole piece diaphragm tension, disadvantages: poor safety and poor unit volume capacity; the advantages of stacking process: high safety and high unit volume capacity, disadvantages: low production efficiency and poor diaphragm tension control.

[0003] For safety reasons, battery cells are mainly produced by stacking. There is a production capacity bottleneck in the stacking process. The current stacking process generally adopts Z-stack and stacking methods. Regardless of Z-stack or stack, the stacking speed is relatively slow and cannot improve production efficiency. In view of this, it is necessary to optimize the stacking machine structure.

[0004] For example, a Chinese patent document with the announcement number CN112635809B discloses a method for stacking battery cells, which uses a battery electrode stacking device to stack the battery electrodes. The battery electrode stacking device includes a heat sealing unit, a cache unit, a stacking unit and a drive unit. Among them, the stacking unit is placed downstream of the cache unit and is used to fold the battery electrodes. The stacking unit includes a turret mechanism and a stacking platform. The turret mechanism includes a turntable and a clamp. The clamp can clamp the battery electrode, and the turntable can drive the clamp to rotate onto the stacking platform. However, the patent uses a clamp structure to transport the electrode to the stacking platform, and the sheet delivery process is relatively cumbersome, which reduces the stacking efficiency. Utility Model Content

[0005] The utility model aims to provide a lamination mechanism for lithium-ion batteries, which solves the problem that in the prior art, the lamination machine transfers the pole pieces to the lamination table through a clamping claw structure, the feeding process is relatively cumbersome, and the lamination efficiency is reduced.

[0006] In order to achieve the above-mentioned object, the utility model provides a lamination mechanism for a lithium-ion battery, comprising a sheet transport assembly, which is used to transport a pole piece unit;

[0007] A lamination table, on the surface of which a pressing knife is arranged on both sides of the transmission direction of the pole piece unit;

[0008] A sheet feeding assembly is arranged between the sheet conveying assembly and the laminating table; the sheet feeding assembly comprises two sheet feeding rollers with opposite rotation directions, and a sheet passing gap is left between the two sheet feeding rollers; the sheet feeding assembly transfers the pole sheet unit from the sheet conveying assembly to the laminating table through the sheet passing gap;

[0009] A lifting assembly connected to the stacking table and causing the stacking table to move up and down;

[0010] The translation assembly is connected to the lifting assembly and enables the lamination platform to translate back and forth along with the lifting assembly in the transmission direction of the pole piece unit.

[0011] Furthermore, the film feeding assembly is arranged above the laminating table, and two film feeding rollers are arranged up and down and the two film feeding rollers are arranged axially in parallel.

[0012] Furthermore, the film conveying assembly includes conveying rollers and a conveying belt. The conveying belt is sleeved on the outside of a plurality of conveying rollers, and the conveying belt is provided with a plurality of vacuum negative pressure suction cup holes.

[0013] Furthermore, the vacuum negative pressure suction cup holes are arranged in 3 to 5 rows along the width direction of the conveyor belt, and the distance between two adjacent vacuum negative pressure suction cup holes in each row is 2 mm to 10 mm.

[0014] Furthermore, the lifting assembly includes a first driving member and a first follower, the first follower is connected to the first driving member, the stacking platform is connected to the first follower, and the first driving member drives the first follower to lift the stacking platform.

[0015] Furthermore, the first driving member is a lifting motor, and the first driven member includes a lifting screw and a vertical plate slide rail. The lifting screw is movably connected to the vertical plate slide rail, and the lifting motor drives the lifting screw to rotate to move the vertical plate slide rail up and down; the stacking table is connected to the vertical plate slide rail.

[0016] Furthermore, the translation assembly includes a second driving member and a second driven member, the second driven member is connected to the second driving member, and the lifting assembly is connected to the second driven member.

[0017] Furthermore, the second driving member is a translation motor, and the second driven member includes a translation screw, a translation slide rail and a translation table, the translation slide rail is arranged below the translation table, the translation screw is movably connected to the translation slide rail, the lifting assembly is installed on the translation table, and the translation motor drives the translation screw to translate the lifting assembly.

[0018] Furthermore, it also includes a core stacking alignment detection component, which is located above the lamination table and is used to detect the alignment of the core stacking during the lamination process.

[0019] Furthermore, the core stack alignment detection component includes a plurality of CCD cameras, and the CCD cameras take pictures during the stacking process to detect the alignment of the core stack.

[0020] Compared with the existing known technologies, the technical solution provided by the utility model has the following beneficial effects:

[0021] (1) The utility model is a lamination mechanism for lithium-ion batteries. The feeding assembly transfers the electrode unit from the sheet conveying assembly to the lamination platform through two oppositely-directed feeding rollers. The two oppositely-directed feeding rollers can provide transmission power for the electrode unit, replacing the traditional method of gripping the electrode unit with a clamp, simplifying the feeding process and increasing the lamination speed. Moreover, the sheet-passing gap between the two feeding rollers can position the electrode unit, making it easy to align it with the electrode unit output by the sheet conveying assembly.

[0022] (2) In the stacking mechanism of a lithium-ion battery of the utility model, the lifting assembly can adjust the height of the stacking platform according to the stacking height of the pole piece unit, and the compatibility is strong. The translation assembly can make the stacking platform move forward and backward in the transmission direction of the pole piece unit, so that the stacking position can be adjusted during stacking, thereby improving the stacking efficiency.

[0023] (3) In the stacking mechanism of a lithium-ion battery of the utility model, the sheet feeding assembly is located above the stacking platform, so that sufficient space is left between the sheet feeding assembly and the stacking platform to prevent the sheet feeding assembly from interfering with the stacking work. Two sheet feeding rollers are arranged up and down and axially parallel, so that the sheet feeding gap can be more easily aligned with the pole piece unit output by the sheet feeding assembly, and the tension of the pole piece unit can also be increased.

[0024] It will be apparent that elements or features described above in the context of a single embodiment may be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In the drawings, the sizes and proportions do not represent the sizes and proportions of actual products. The drawings are merely illustrative, and some non-essential elements or features are omitted for clarity.

[0026] Figure 1 It is a structural schematic diagram of the lamination mechanism of an embodiment of the utility model;

[0027] Figure 2 This is a diagram of the stacking state of the pole piece units of an embodiment of the utility model;

[0028] Figure 3 It is a structural schematic diagram of a conveyor belt in an embodiment of the utility model.

[0029] Description of Reference Numerals

[0030] 100, film transport assembly; 110, conveyor roller; 120, conveyor belt; 121, vacuum negative pressure suction cup hole; 200, stacking table; 210, press knife; 300, pole piece unit; 400, film feeding assembly; 410, film feeding roller; 500, lifting assembly; 510, lifting motor; 520, lifting screw; 530, vertical plate slide; 600, translation assembly; 610, translation motor; 620, translation screw; 630, translation slide; 640, translation table; 700, core stacking alignment detection assembly; 710, CCD camera. DETAILED DESCRIPTION

[0031] The present invention will be described in detail with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0032] Example

[0033] Reference Figure 1-Figure 3 , this embodiment provides a stacking mechanism for a lithium-ion battery, comprising the following components:

[0034] The film transport assembly 100 is used to transport the pole piece unit 300;

[0035] The lamination table 200 has a pressing knife 210 disposed on both sides of the transmission direction of the pole piece unit 300. The pressing knife 210 can achieve the pressing and loosening of the pole piece unit 300 by moving up and down;

[0036] The film feeding assembly 400 is disposed between the film transport assembly 100 and the film stacking platform 200; the film feeding assembly 400 includes two film feeding rollers 410 with opposite rotation directions, and a film passing gap is left between the two film feeding rollers 410;

[0037] A lifting assembly 500, which is connected to the laminating table 200 and enables the laminating table 200 to move up and down;

[0038] The translation assembly 600 is connected to the lifting assembly 500 and enables the lamination platform 200 to translate back and forth along with the lifting assembly 500 in the transmission direction of the pole piece unit 300 .

[0039] The feeding assembly 400 transfers the pole piece unit 300 from the feeding assembly 100 to the laminating table 200 through the sheet gap; the feeding assembly 400 transfers the pole piece unit 300 from the feeding assembly 100 to the laminating table 200 through two feeding rollers 410 with opposite directions. The two feeding rollers 410 with opposite directions can provide transmission power for the pole piece unit 300, replacing the traditional transportation method of gripping the pole piece unit 300 with a clamp, simplifying the feeding process and improving the laminating speed. Moreover, the sheet gap between the two feeding rollers 410 can position the pole piece unit 300, which is convenient for alignment with the pole piece unit 300 output by the feeding assembly 100. Moreover, the lifting assembly 500 can adjust the height of the laminating table 200 according to the laminating height of the pole piece unit 300, and has strong compatibility. The translation assembly 600 can make the laminating table 200 move forward and backward in the transmission direction of the pole piece unit 300, so that the laminating position can be adjusted during laminating, thereby improving the laminating efficiency.

[0040] Furthermore, in this embodiment, if Figure 1 As shown, the sheet feeding assembly 400 is arranged above the lamination platform 200, so that there is sufficient space between the sheet feeding assembly 400 and the lamination platform 200 to prevent the sheet feeding assembly 400 from interfering with the lamination work. Two sheet feeding rollers 410 are arranged up and down and the two sheet feeding rollers 410 are arranged axially parallel. The sheet feeding gap can be more easily aligned with the pole piece unit 300 output by the sheet feeding assembly 100, and the tension of the pole piece unit 300 can also be increased.

[0041] Specifically, Figure 1 and Figure 2 As shown, the film conveying assembly 100 includes a conveying roller 110 and a conveying belt 120. The conveying belt 120 is sleeved on the outside of a plurality of conveying rollers 110. The conveying rollers 110 rotate under the drive of the driving mechanism. The conveying belt 120 can rotate around the conveying rollers 110 as the conveying rollers 110 rotate, and the pole piece unit 300 moves with the conveying belt 120. Considering the stability of the pole piece unit 300 when it moves, the conveying belt 120 is provided with a plurality of vacuum negative pressure suction cup holes 121. The vacuum negative pressure suction cup generates an adsorption force on the surface of the conveying belt 120, thereby enhancing the adsorption of the pole piece unit 300 and improving the stability of the pole piece unit 300 when it is transported.

[0042] It should be noted that the widths of the pole piece units 300 of batteries of different specifications are different, and the adsorption force of the conveyor belt 120 on pole piece units 300 of different sizes should also vary, and the variation of the adsorption force can be achieved by adjusting the number of vacuum negative pressure suction cup holes 121. In this embodiment, the vacuum negative pressure suction cup holes 121 are arranged in 3 to 5 rows along the width direction of the conveyor belt 120, and the spacing between two adjacent vacuum negative pressure suction cup holes 121 in each row is 2 mm to 10 mm.

[0043] In this embodiment, the lifting assembly 500 includes a first driving member and a first driven member, the first driven member is connected to the first driving member, the laminating platform 200 is connected to the first driven member, and the first driving member drives the first driven member to lift the laminating platform 200. Specifically, as Figure 1 As shown, the first driving member is a lifting motor 510, and the first driven member includes a lifting screw 520 and a vertical plate slide 530. The lifting screw 520 is movably connected to the vertical plate slide 530. The lifting motor 510 drives the lifting screw 520 to rotate so that the vertical plate slide 530 moves up and down; the stacking platform 200 is connected to the vertical plate slide 530, and the vertical plate slide 530 moves up and down to drive the stacking platform 200 to move up and down. In addition, the first driving member can also adopt a mechanism such as a hydraulic rod or an electric push rod, and the first driven member is correspondingly changed to a component that adapts to the hydraulic rod or the electric push rod, so that the stacking platform 200 can move up and down.

[0044] In this embodiment, the translation assembly 600 includes a second driving member and a second driven member, the second driven member is connected to the second driving member, and the lifting assembly 500 is connected to the second driven member. Figure 1 As shown, the second driving member is a translation motor 610, and the second driven member includes a translation screw 620, a translation rail 630, and a translation table 640. The translation rail 630 is arranged below the translation table 640, and the translation screw 620 is movably connected with the translation rail 630. The lifting assembly 500 is installed on the translation table 640. The translation motor 610 drives the translation screw 620 to translate the lifting assembly 500. In addition, the second driving member can also use components such as hydraulic rods or electric push rods. Correspondingly, the second driven member can use components that conform to the movement principle of hydraulic rods or electric push rods, which can achieve left and right translation of the stacking table 200.

[0045] In this embodiment, the lamination mechanism further includes a core stacking alignment detection assembly 700, which is located above the lamination platform 200 and is used to detect the alignment of the core stacking during the lamination process. Figure 1As shown, the stacking core alignment detection component 700 includes several CCD cameras 710, and the CCD cameras 710 take photos to detect the alignment of the stacked cores during the stacking process. The stacking platform 200 can be translated left and right under the action of the translation component 600. The pole piece unit 300 falls on the stacking platform 200 and is pressed by the right-side pressing knife 210. The left-side pressing knife 210 opens in advance. After the right-side pressing knife 210 presses, the stacking platform 200 moves rightward at the same speed as the sheet feeding roller 410 spits out the sheet. When the pole piece unit 300 is completely ejected and falls on the stacking platform 200, the left-side pressing knife 210 immediately starts to press. After the pressing is completed, the stacking platform 200 reaches the right limit position. At this position, the stacking platform 200 will be stationary due to the response time of the translation motor 610. At the same time, the upper CCD camera 710 takes photos to detect the stacking alignment. After the detection is qualified, the stacking platform 200 moves leftward and returns to the splicing position, and the above action is repeated.

[0046] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The protection scope of the present invention is limited only by the claims. Thanks to the teachings of the present invention, those skilled in the art will easily recognize that alternative structures to the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. A stacking mechanism for a lithium-ion battery, characterized in that: include A film transport assembly (100) for transporting a pole piece unit (300); A lamination table (200) having a pressing knife (210) disposed on its surface on both sides of the transmission direction of the pole piece unit (300); A film feeding assembly (400) is arranged between the film transport assembly (100) and the laminating table (200); the film feeding assembly (400) comprises two film feeding rollers (410) with opposite rotations, and a film passing gap is left between the two film feeding rollers (410); the film feeding assembly (400) transfers the pole piece unit (300) from the film transport assembly (100) to the laminating table (200) through the film passing gap; A lifting assembly (500) connected to the lamination platform (200) and causing the lamination platform (200) to move up and down; The translation assembly (600) is connected to the lifting assembly (500) and enables the lamination platform (200) to translate forward and backward along with the lifting assembly (500) in the transmission direction of the pole piece unit (300).

2. A stacking mechanism for a lithium-ion battery according to claim 1, characterized in that: The film feeding assembly (400) is arranged above the film stacking platform (200), and the two film feeding rollers (410) are arranged up and down and the two film feeding rollers (410) are arranged axially in parallel.

3. A stacking mechanism for a lithium-ion battery according to claim 1, characterized in that: The film transport assembly (100) comprises a transport roller (110) and a transport belt (120). The transport belt (120) is sleeved on the outside of a plurality of transport rollers (110). The transport belt (120) is provided with a plurality of vacuum negative pressure suction cup holes (121).

4. A stacking mechanism for a lithium-ion battery according to claim 3, characterized in that: The vacuum negative pressure suction cup holes (121) are arranged in 3 to 5 rows along the width direction of the conveyor belt (120), and the distance between two adjacent vacuum negative pressure suction cup holes (121) in each row is 2 mm to 10 mm.

5. The stacking mechanism of a lithium-ion battery according to claim 1, characterized in that: The lifting assembly (500) comprises a first driving member and a first driven member, the first driven member is connected to the first driving member, the lamination platform (200) is connected to the first driven member, and the first driving member drives the first driven member to lift the lamination platform (200).

6. A stacking mechanism for a lithium-ion battery according to claim 5, characterized in that: The first driving member is a lifting motor (510), and the first driven member includes a lifting screw (520) and a vertical plate slide rail (530). The lifting screw (520) is movably connected to the vertical plate slide rail (530). The lifting motor (510) drives the lifting screw (520) to rotate so that the vertical plate slide rail (530) moves up and down; the stacking platform (200) is connected to the vertical plate slide rail (530).

7. A stacking mechanism for a lithium-ion battery according to claim 1, characterized in that: The translation assembly (600) comprises a second driving member and a second driven member, the second driven member is connected to the second driving member, and the lifting assembly (500) is connected to the second driven member.

8. A stacking mechanism for a lithium-ion battery according to claim 7, characterized in that: The second driving member is a translation motor (610), and the second driven member comprises a translation lead screw (620), a translation slide rail (630) and a translation table (640); the translation slide rail (630) is arranged below the translation table (640); the translation lead screw (620) is movably connected to the translation slide rail (630); the lifting assembly (500) is installed on the translation table (640); and the translation motor (610) drives the translation lead screw (620) to translate the lifting assembly (500).

9. The stacking mechanism of a lithium-ion battery according to claim 1, characterized in that: It also comprises a core stacking alignment detection component (700), which is located above the lamination platform (200) and is used to detect the alignment of the core stacking during the lamination process.

10. A stacking mechanism for a lithium-ion battery according to claim 9, characterized in that: The core stack alignment detection component (700) comprises a plurality of CCD cameras (710), and the CCD cameras (710) take photos during the lamination process to detect the alignment of the core stack.

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