An electrode stacking device

Abstract

This utility model discloses an electrode stacking device, including a positive electrode transfer device, a negative electrode transfer device, a positive electrode slitting device, a negative electrode slitting device, a first stacking device, a second stacking device, a negative single-sided electrode transfer device, a first separator loading device, and a second separator loading device. The positive electrode slitting device is positioned corresponding to the output end of the positive electrode transfer device, and the negative electrode slitting device is positioned corresponding to the output end of the negative electrode transfer device. The first stacking device and the second stacking device are positioned opposite each other between the positive electrode slitting device and the negative electrode slitting device. The positive and negative electrode sheets on the positive and negative electrode transfer devices are transferred to the first stacking device and the second stacking device, respectively, and the positive and negative electrode sheets are stacked together with a separator to form a battery cell. This utility model can achieve high-speed stacking, high stacking efficiency, and high stacking accuracy.

Description

[0001] This application claims priority to Chinese Patent Application No. 2024229538172, filed on November 29, 2024, entitled "An Electrode Stacking Device". Technical Field

[0002] This utility model relates to the field of battery manufacturing technology, specifically to an electrode stacking device. Background Technology

[0003] Currently, lithium-ion batteries are widely used in consumer electronics, new energy vehicles, and energy storage. With the rapid development of the application market and the continuous improvement of user requirements for products, how to produce lithium-ion batteries with good safety performance, high specific energy, long cycle life, and low cost has become an important research direction in the field of lithium-ion batteries.

[0004] Lithium-ion batteries can be divided into two types based on their manufacturing method: wound and stacked. Wound batteries offer fast processing speed and high efficiency, but they have the following drawbacks: 1. Wound batteries require a certain degree of flexibility in the electrode sheets, resulting in lower electrode areal density and limiting the energy density of individual cells; 2. The reaction at the bending points of the electrode sheets in wound batteries differs from other locations, leading to poor electrode reaction uniformity, affecting performance and even posing safety hazards; 3. To completely enclose the positive electrode, wound batteries leave some ineffective areas on the negative electrode sheet, contributing no capacity and reducing the battery's energy density. In contrast, stacked batteries offer better electrode reaction uniformity, are safer, and allow for thicker electrode coatings, thus increasing the battery's energy density.

[0005] Existing stacking equipment suffers from slow stacking speed and low efficiency, which prolongs the production cycle and increases production costs. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an electrode stacking device that can achieve high-speed stacking, greatly improve stacking efficiency, and improve stacking accuracy.

[0007] The technical solution of this utility model is as follows:

[0008] An electrode stacking device includes a positive electrode transfer device, a negative electrode transfer device, a positive electrode slitting device, a negative electrode slitting device, a first stacking device, a second stacking device, a negative single-sided electrode transfer device, a first separator loading device, and a second separator loading device.

[0009] The die-cut positive and negative electrode sheets are transferred through positive electrode sheet transfer devices and negative electrode sheet transfer devices, respectively.

[0010] The positive electrode sheet separating device is set at the output end of the positive electrode sheet transfer device, and the negative electrode sheet separating device is set at the output end of the negative electrode sheet transfer device. The first stacking device and the second stacking device are arranged opposite to each other between the positive electrode sheet separating device and the negative electrode sheet separating device. The positive electrode sheet and the negative electrode sheet are transferred from the positive electrode sheet transfer device and the negative electrode sheet transfer device to the first stacking device and the second stacking device, respectively. Then, the positive and negative electrode sheets are stacked together with the separator to form a battery cell.

[0011] The negative electrode single-sided sheet transfer device is located on one side of the negative electrode sheet slitting device. It is used to transfer the negative electrode single-sided sheet to the negative electrode sheet slitting device, and then transport it to the first stacking device and the second stacking device to coat the battery cell.

[0012] The first separator loading device is located on one side of the first stacking device, and the second separator loading device is located on one side of the second stacking device, for transporting separators onto the first stacking device and the second stacking device to separate different cells.

[0013] Furthermore, both the positive electrode transfer device and the negative electrode transfer device transfer the die-cut electrodes via belt conveyors.

[0014] Furthermore, the belt conveyor is driven by a main drive motor, a brush assembly is provided below the belt conveyor, and a surface dust removal assembly and an iron removal assembly are provided above the belt conveyor. The brush assembly, surface dust removal assembly, and iron removal assembly are arranged sequentially along the belt conveyor direction.

[0015] Furthermore, the positive electrode sheet separating device and the negative electrode sheet separating device have the same structure, both including a marble base, a linear motor and several separating robotic arms. The linear motor is mounted on the marble base, and the several separating robotic arms are movably mounted on the linear motor. Each separating robotic arm has two suction cup positions, and the electrode sheets are transferred by adsorption through the suction cups. Several electrode sheet buffering platforms are provided between the first stacking device and the second stacking device for electrode sheet buffering during the sheet separation and transfer process.

[0016] Furthermore, the first and second stacking devices have the same structure, both including a positive electrode correction component, a negative electrode correction component, a stacking stage, and a stacking robot. The stacking stage is located between the positive electrode correction component and the negative electrode correction component, and two stacking robots are provided and movably positioned above the positive electrode correction component, the stacking stage, and the negative electrode correction component.

[0017] Furthermore, the positive electrode correction assembly and the negative electrode correction assembly have the same structure, both including an X-axis correction module, a Y-axis correction module and a θ correction motor. The Y-axis correction module is movably mounted on the X-axis correction module, and the θ correction motor is movably mounted on the Y-axis correction module. The electrode is placed on the θ correction motor for correction in three directions.

[0018] Furthermore, the negative electrode single-sided sheet transfer device includes a negative electrode single-sided sheet conveyor belt, a single-sided sheet handling robot, a single-sided sheet feeding robot, and a single-sided sheet buffer belt. The single-sided sheet buffer belt is located on one side of the negative electrode single-sided sheet conveyor belt. The single-sided sheet handling robot and the single-sided sheet feeding robot are movably mounted on the negative electrode single-sided sheet conveyor belt. The single-sided sheet handling robot transports the negative electrode single-sided sheets die-cut by the single-sided sheet making equipment to the negative electrode single-sided sheet conveyor belt. Then, the single-sided sheet feeding robot transports the negative electrode single-sided sheets on the negative electrode single-sided sheet conveyor belt to the single-sided sheet buffer belt for transport by the negative electrode sheet separating device.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides an electrode stacking device, in which the die-cut positive and negative electrode sheets are respectively transferred to the positive electrode sheet separating device and the negative electrode sheet separating device via the positive electrode sheet transfer device and the negative electrode sheet separating device, respectively. The positive electrode sheet separating device and the negative electrode sheet separating device then respectively transport the positive and negative electrode sheets transferred by the positive electrode sheet transfer device and the negative electrode sheet transfer device to the left and right first stacking device and second stacking device. The electrode is stacked with a separator to form a battery cell. After the battery cell is completed, the negative electrode sheet is transported to the first stacking device and the second stacking device through the negative electrode sheet separation device to cover the battery cell. The first stacking device and the second stacking device can stack two or more sets of battery cells at the same time. The battery cells are separated by a separator in the middle. At the same time, it can accommodate multiple sets of battery cell sheets with different shapes. The stacking efficiency of this electrode sheet stacking equipment is high, and the stacking efficiency of a single sheet can be increased to 0.4s. The overall efficiency of the machine is 2PPM higher than that of the existing equipment, which can greatly improve production efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the structure of an electrode stacking device provided by this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the belt conveyor described in this utility model;

[0023] Figure 3 This is a schematic diagram of the positive electrode sheet separation device and the negative electrode sheet separation device of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the first and second lamination devices of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the positive electrode correction assembly and the negative electrode correction assembly of this utility model.

[0026] In the picture:

[0027] 1. Positive electrode sheet transfer device; 2. Negative electrode sheet transfer device; 3. Positive electrode sheet separation device; 4. Negative electrode sheet separation device; 5. First stacking device; 6. Second stacking device; 7. Negative single-sided sheet transfer device; 8. First separator loading device; 9. Second separator loading device; 10. Electrode sheet buffer platform; 11. Belt conveyor; 12. Main drive motor; 13. Brush assembly; 14. Surface dust removal assembly; 15. Iron removal assembly; 31. Base; 32. Linear motor; 33. Segmentation robot; 34. Suction cup; 51. Positive electrode sheet correction assembly; 52. Negative electrode sheet correction assembly; 53. Stacking table; 54. Stacking robot; 511. X-axis correction module; 512. Y-axis correction module; 513. Theta correction motor; 71. Negative single-sided sheet conveyor belt; 72. Single-sided sheet handling robot; 73. Single-sided sheet feeding robot; 74. Single-sided sheet buffer belt. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] To illustrate the technical solution described in this utility model, specific embodiments are described below.

[0030] Example

[0031] Please see Figure 1This embodiment provides an electrode stacking device, including a positive electrode sheet transfer device 1, a negative electrode sheet transfer device 2, a positive electrode sheet separating device 3, a negative electrode sheet separating device 4, a first stacking device 5, a second stacking device 6, a negative single-sided sheet transfer device 7, a first partition plate loading device 8, and a second partition plate loading device 9. Die-cut positive and negative electrode sheets are transferred via the positive electrode sheet transfer device 1 and the negative electrode sheet transfer device 2, respectively. The positive electrode sheet separating device 3 is positioned corresponding to the output end of the positive electrode sheet transfer device 1, and the negative electrode sheet separating device 4 is positioned corresponding to the output end of the negative electrode sheet transfer device 2. The first stacking device 5 and the second stacking device 6 are positioned opposite each other between the positive electrode sheet separating device 3 and the negative electrode sheet separating device 4. The positive electrode sheet separating device 3 and the negative electrode sheet separating device 4 transfer the positive and negative electrode sheets from the positive electrode sheet transfer device 1 and the negative electrode sheet transfer device 2 to the first stacking device 5 and the second stacking device 6, respectively. On the wafer assembly 6, the positive and negative electrode sheets are stacked together with the separator by the first stacking assembly 5 and the second stacking assembly 6 to form a battery cell; the negative electrode single-sided sheet transfer device 7 is set on one side of the negative electrode sheet separating assembly 4, and is used to transfer the negative electrode single-sided sheet to the negative electrode sheet separating assembly 4, and then the negative electrode sheet separating assembly 4 transports it to the first stacking assembly 5 and the second stacking assembly 6 to coat the battery cell; the first separator loading device 8 is set on one side of the first stacking assembly 5, and the second separator loading device 9 is set on one side of the second stacking assembly 6, and is used to transport the separator to the first stacking assembly 5 and the second stacking assembly 6 to separate different battery cells.

[0032] The positive electrode transfer device 1 and the negative electrode transfer device 2 both transfer the die-cut electrodes via a belt conveyor 11. Figure 2 As shown, the belt conveyor 11 is driven by the main drive motor 12. A brush assembly 13 is arranged below the belt conveyor 11, and a surface dust removal assembly 14 and an iron removal assembly 15 are arranged above the belt conveyor 11. The brush assembly 13, the surface dust removal assembly 14, and the iron removal assembly 15 are arranged sequentially along the belt conveying direction. The brush assembly 13 is used to clean the dust on the belt surface, and the surface dust removal assembly 14 and the iron removal assembly 15 are used to remove impurities from the surface of the electrode plates on the belt.

[0033] Specifically, such as Figure 3 As shown, the positive electrode sheet separating device 3 and the negative electrode sheet separating device 4 have the same structure, both including a marble base 31, a linear motor 32 and several separating robotic arms 33. The linear motor 32 is mounted on the marble base 31, and the several separating robotic arms 33 are movably mounted on the linear motor 32. Each separating robotic arm 33 is provided with two suction cup positions, and the electrode sheet is transferred by adsorption through the suction cups 34.

[0034] Among them, a plurality of electrode cache platforms 10 are provided between the first stacking device 5 and the second stacking device 6 for electrode cache during the electrode transfer process.

[0035] Specifically, such as Figure 4 As shown, the first stacking device 5 and the second stacking device 6 have the same structure, both including a positive electrode sheet correction assembly 51, a negative electrode sheet correction assembly 52, a stacking stage 53, and a stacking robot 54. The stacking stage 53 is disposed between the positive electrode sheet correction assembly 51 and the negative electrode sheet correction assembly 52. ​​Two stacking robots 54 are provided and movably disposed above the positive electrode sheet correction assembly 51, the stacking stage 53, and the negative electrode sheet correction assembly 52. Figure 5 As shown, the positive electrode correction assembly 51 and the negative electrode correction assembly 52 have the same structure, both including an X-axis correction module 511, a Y-axis correction module 512, and a θ correction motor 513. The Y-axis correction module 512 is movably mounted on the X-axis correction module 511, and the θ correction motor 513 is movably mounted on the Y-axis correction module 512. The electrode is placed on the θ correction motor 513 for correction in three directions, ensuring that the electrode meets the positional accuracy requirements before entering the stacking table 53, thus improving the cell coverage accuracy. At the same time, the X-axis correction module 511 can actively translate and feed the material, improving the handling efficiency. Then, the stacking robot 54 transports the corrected electrode to the stacking table 53 for stacking. The diaphragm swing roller swings left and right to form a Z-shaped stack to cover the electrode. Since the stacking table 53 is stationary during this process, the accuracy loss problem of large inertia moving parts is reduced, and the cell coverage is improved from the existing ±0.15mm to ±0.1mm.

[0036] The negative electrode single-sided sheet transfer device 7 includes a negative electrode single-sided sheet conveyor belt 71, a single-sided sheet handling robot 72, a single-sided sheet feeding robot 73, and a single-sided sheet buffer belt 74. The single-sided sheet buffer belt 74 is located on one side of the negative electrode single-sided sheet conveyor belt 71. The single-sided sheet handling robot 72 and the single-sided sheet feeding robot 73 are movably mounted on the negative electrode single-sided sheet conveyor belt 71. The single-sided sheet handling robot 72 transports the negative electrode single-sided sheets die-cut by the single-sided sheet making equipment to the negative electrode single-sided sheet conveyor belt 71. Then, the single-sided sheet feeding robot 73 transports the negative electrode single-sided sheets on the negative electrode single-sided sheet conveyor belt 71 to the single-sided sheet buffer belt 74 for transport by the negative electrode sheet separating device 4.

[0037] In summary, this electrode stacking equipment has the following characteristics:

[0038] (1) High stacking efficiency, the single-wafer stacking efficiency can be increased to 0.4s, and the overall machine efficiency is 2PPM higher than the existing equipment, which can greatly improve production efficiency;

[0039] (2) The stacking platform of the stacking device is stationary and is completed by the diaphragm swinging, which improves efficiency and coverage accuracy;

[0040] (3) The electrode correction component of the stacking device can actively feed materials, which improves the handling efficiency.

[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pole piece lamination apparatus, characterized by, The electrode stacking equipment includes: A positive electrode transfer device is configured to supply a series of individual positive electrode sheets along the supply direction; The negative electrode transfer device is arranged opposite to the positive electrode transfer device in the supply direction and configured to supply a series of individual negative electrode sheets along the supply direction; A positive electrode sheet separating device extends in a direction perpendicular to the supply direction and is located downstream of the positive electrode sheet transfer device, configured to receive a series of individual positive electrode sheets from the positive electrode sheet transfer device; A negative electrode sheet separating device extends in a direction perpendicular to the supply direction and is located downstream of the negative electrode sheet transfer device, configured to receive a series of individual negative electrode sheets from the negative electrode sheet transfer device; A first stacking device is disposed between the positive electrode sheet separating device and the negative electrode sheet separating device, and is located on the same side as the positive electrode sheet transfer device. The first stacking device is configured to receive a single positive electrode sheet from the positive electrode sheet separating device and a single negative electrode sheet from the negative electrode sheet separating device, and stack the positive and negative electrode sheets together with a separator to form a battery cell. The second stacking device is disposed between the positive electrode sheet separating device and the negative electrode sheet separating device, and is located on the same side as the negative electrode sheet transfer device. The second stacking device is configured to receive a single positive electrode sheet from the positive electrode sheet separating device and a single negative electrode sheet from the negative electrode sheet separating device, and stack the positive and negative electrode sheets together with the separator to form a battery cell. A negative electrode single-sided sheet transfer device extends in a direction perpendicular to the supply direction and is arranged adjacent to the negative electrode sheet splitting device. It is configured to transfer the negative electrode single-sided sheet to the negative electrode sheet splitting device, and then transport it through the negative electrode sheet splitting device to the first stacking device and the second stacking device to coat the battery cell. A first separator loading device is located on the same side as the first stacking device; a second separator loading device is located on the same side as the second stacking device. The first separator loading device and the second separator loading device are configured to transport separators onto the first stacking device and the second stacking device, respectively, to separate different cells.

2. The pole lamination stacking apparatus of claim 1, wherein: Both the positive electrode transfer device and the negative electrode transfer device transfer the die-cut electrodes via belt conveyors.

3. The pole lamination stacking apparatus of claim 2, wherein: The belt conveyor is driven by a main drive motor. A brush assembly is installed below the belt conveyor, and a surface dust removal assembly and an iron removal assembly are installed above the belt conveyor. The brush assembly, surface dust removal assembly, and iron removal assembly are arranged sequentially along the belt conveyor direction.

4. The pole lamination stacking apparatus of claim 1, wherein: The positive electrode sheet separating device and the negative electrode sheet separating device have the same structure, both including a base, a linear motor and several separating manipulators. The linear motor is mounted on the base, and the several separating manipulators are movably mounted on the linear motor. Each separating manipulator has two suction cup positions, and the electrode sheets are transferred by adsorption through the suction cups. Several electrode sheet buffering platforms are provided between the first stacking device and the second stacking device for electrode sheet buffering during the separating and transfer process.

5. The pole lamination stacking apparatus of claim 1, wherein: The first and second stacking devices have the same structure, both including a positive electrode correction component, a negative electrode correction component, a stacking stage, and a stacking robot. The stacking stage is located between the positive electrode correction component and the negative electrode correction component. Two stacking robots are provided and are movably positioned above the positive electrode correction component, the stacking stage, and the negative electrode correction component.

6. The pole lamination stack apparatus of claim 5, wherein: The positive electrode correction assembly and the negative electrode correction assembly have the same structure, both including an X-axis correction module, a Y-axis correction module and a θ correction motor. The Y-axis correction module is movably mounted on the X-axis correction module, and the θ correction motor is movably mounted on the Y-axis correction module. The electrode is placed on the θ correction motor for correction in three directions.

7. The pole lamination stack apparatus of claim 1, wherein: The negative electrode single-sided sheet transfer device includes a negative electrode single-sided sheet conveyor belt, a single-sided sheet handling robot, a single-sided sheet feeding robot, and a single-sided sheet buffer belt. The single-sided sheet buffer belt is located on one side of the negative electrode single-sided sheet conveyor belt. The single-sided sheet handling robot and the single-sided sheet feeding robot are movably mounted on the negative electrode single-sided sheet conveyor belt. The single-sided sheet handling robot transports the negative electrode single-sided sheets die-cut by the single-sided sheet making equipment to the negative electrode single-sided sheet conveyor belt. Then, the single-sided sheet feeding robot transports the negative electrode single-sided sheets on the negative electrode single-sided sheet conveyor belt to the single-sided sheet buffer belt for transport by the negative electrode sheet separating device.

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