L-shaped double-station lamination machine for lithium battery cell

Abstract

The application discloses a lithium battery cell L-shaped double-station lamination machine, which comprises a lamination machine table, a left deviation rectifying system, a cell hot-pressing system and a right deviation rectifying system which are sequentially arranged on the lamination machine table, wherein the left deviation rectifying system and the right deviation rectifying system are respectively arranged on the two sides of the lamination machine table, and the cell hot-pressing system is arranged between the left deviation rectifying system and the right deviation rectifying system. The double-station lamination machine realizes multi-station sharing, reduces the equipment size, realizes one-person multi-machine operation, reduces the labor cost, improves the production efficiency, meets the size data of L-shaped cell lamination production requirements, reduces the time for the pole piece moving platform to take the coating single-sided sheet and the length of the screw rod, improves the lamination time and the production efficiency, and the cylinder rack rotating mechanism can greatly reduce the cost, the preheating platform is additionally provided with a spring self-resetting device to prevent delamination and improve the good products.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production equipment technology, specifically to an L-shaped dual-station stacking machine for lithium battery cells. Background Technology

[0002] With the dwindling availability of oil resources, lithium-ion batteries, as a novel and stable energy source, have gained attention from various countries. The first step in battery manufacturing is assembling the cells and electrode sheets into a battery, a process known as cell stacking.

[0003] In traditional stacking machines, the positive electrode calibration table is fixed, and the positive and negative material bins and the upper and lower coating single-sided sheet material bins are arranged vertically. The material handling time for the first and last stacked cells is twice that of normal stacking. The material handling time is long, the lead screw is unstable, and the cell pre-compression rotating platform is driven by the cell to rotate the indexing wheel, which is costly. The pre-compression platform may cause the stacked cells to move, and the robotic arm may cause the cells to delaminate when picking up the cells, resulting in defective products. Summary of the Invention

[0004] To overcome the shortcomings of existing technical solutions, this invention provides an L-shaped dual-station stacking machine for lithium battery cells, which can effectively solve the problems mentioned in the background technology.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A lithium battery cell L-shaped dual-station stacking machine includes a stacking machine table, a left correction system, a cell hot pressing system, and a right correction system sequentially arranged on the stacking machine table. The left and right correction systems are respectively located on both sides of the stacking machine table, and the cell hot pressing system is located between the left and right correction systems. The stacking machine table includes an automatic lifting loading hopper, a positive electrode hopper, a negative electrode hopper, a positive electrode stacking station, a negative electrode stacking station, a separator scraping mechanism, a material handling mechanism, a separator cutting mechanism, and an automatic lifting stacking unloading mechanism. The automatic lifting loading hopper is used to place the upper coated electrode sheet, the lower coated electrode sheet, the positive electrode sheet, and the negative electrode sheet. The positive electrode hopper and the negative electrode hopper are arranged horizontally with the automatic lifting loading hopper. The material handling mechanism includes a positive electrode material handling robot, a negative electrode material handling robot, and a vacuum adsorption module.

[0007] The left correction system includes a left negative electrode calibration table, a left positive electrode moving calibration table, a left single-sided coated electrode transfer robot, a left stacking mechanism, and a left reverse diaphragm mechanism. The left negative electrode calibration table is connected to the left positive electrode moving calibration table. The right correction system includes a right positive electrode moving calibration table, a right negative electrode calibration table, a right single-sided coated electrode transfer robot, a right stacking mechanism, and a right reverse diaphragm mechanism. The right positive electrode moving calibration table is connected to the right negative electrode table. The left and right correction systems also include a calibration station, where the top-coated electrode is placed in the calibration station from the automatic lifting and lowering feeding hopper by the positive electrode picking and placing robot for stacking calibration.

[0008] The battery cell hot pressing system includes a preheating platform, a main battery cell pressing mechanism, a pre-pressing battery cell mechanism, a first battery cell transfer robot, and a second battery cell transfer robot. The main battery cell pressing mechanism is connected to the pre-pressing battery cell mechanism. The first battery cell transfer robot is used for main and pre-pressing transfer of the battery cell, and the second battery cell transfer robot is used for left and right transfer of the battery cell. The preheating platform is also equipped with a battery cell hot pressing robot and a spring reset structure.

[0009] As a further description of the above technical solution, the stacking machine is also equipped with a control screen, which is connected to the diaphragm scraping mechanism, the positive electrode picking and placing robot, the negative electrode picking and placing robot, the vacuum adsorption module, the diaphragm cutting mechanism, and the automatic lifting stacking and unloading mechanism. The diaphragm cutting mechanism includes a diaphragm scraper and a hot cutting knife. The diaphragm scraper attaches the diaphragm to the upper coated electrode. The negative electrode is placed on the diaphragm by the negative electrode picking and placing robot and stacked with the upper coated electrode.

[0010] As a further description of the above technical solution, the vacuum adsorption module includes a vacuum suction cup, which is disposed on the positive electrode picking and placing robot and the negative electrode picking and placing robot. The positive electrode picking and placing robot and the negative electrode picking and placing robot sequentially place the upper coated electrode, the lower coated electrode, the positive electrode and the negative electrode on the calibration station onto the preheating platform for pressing.

[0011] As a further description of the above technical solution, both the left and right reverse diaphragm mechanisms include a stepper motor. The stepper motor is connected to the diaphragm cutting mechanism. The left reverse diaphragm mechanism stretches the diaphragm in the reverse direction by translation through the stepper motor, and the right reverse diaphragm mechanism stretches the diaphragm in the reverse direction by translation through the stepper motor.

[0012] As a further description of the above technical solution, the preheating platform is also provided with a cell hot pressing station, a cell station and a cell clamping robot. The cell clamping robot places the stacked cells in the cell station by flipping them over. The cell hot pressing robot clamps the cells in the cell station for cell hot pressing. The automatic lifting stacking and unloading mechanism is connected to the cell hot pressing robot. The automatic lifting stacking and unloading mechanism includes an automatic lifting stacking and unloading station, which is also equipped with a sensor.

[0013] As a further description of the above technical solution, the left and right reverse diaphragm mechanisms also include a cylinder and a rotating rod, wherein the rotation angle of the rotating rod is 90°.

[0014] As a further description of the above technical solution, both the upper coated electrode and the lower coated electrode are positive electrodes.

[0015] As a further description of the above technical solution, both the left and right single-sided coated electrode transfer robots are connected to a walking module, and the left and right single-sided coated electrode transfer robots can move along the Z-axis, Y-axis and X-axis of the stacking machine via the walking module.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The L-shaped dual-station stacking machine for lithium battery cells of the present invention has at least one of the following beneficial effects during use:

[0018] This dual-station stacking machine enables multiple stations to be shared, reducing equipment size, allowing one person to operate multiple machines, lowering labor costs, and improving production efficiency. It meets the dimensional requirements for L-type battery cell stacking. The robotic arm first picks up the coated single-sided sheet and waits for the calibration table to move. Once the first and last battery cells have been calibrated and moved to the position where the robotic arm has picked up the coated single-sided sheet, the robotic arm places the coated single-sided sheet onto the calibration table, which then returns to zero. This reduces the time required for the electrode moving platform to pick up the coated single-sided sheet and the length of the lead screw. It improves stacking time and production efficiency, and the use of a cylinder rack and pinion rotation mechanism significantly reduces costs. The preheating platform is equipped with a spring self-resetting mechanism to prevent delamination and improve yield. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an L-shaped dual-station stacking machine for lithium battery cells according to the present invention;

[0020] Figure 2 This is a schematic diagram of the first part of the structure of an L-shaped dual-station stacking machine for lithium battery cells according to the present invention;

[0021] Figure 3This is a schematic diagram of the second part of the structure of an L-shaped dual-station stacking machine for lithium battery cells according to the present invention;

[0022] Figure 4 This is a schematic diagram of the third part of an L-shaped dual-station stacking machine for lithium battery cells according to the present invention.

[0023] Numbering on the map:

[0024] 1. Stacking machine; 101. Control panel; 2. Left correction system; 201. Left negative electrode alignment table; 202. Left positive electrode moving alignment table; 203. Left single-sided coated electrode transfer robot; 204. Left stacking mechanism; 205. Left reverse diaphragm mechanism; 3. Right correction system; 301. Right positive electrode moving alignment table; 302. Right negative electrode alignment table; 303. Right single-sided coated electrode transfer robot; 304. Right stacking mechanism; 305. Right reverse diaphragm mechanism; 4. Cell hot pressing system; 401. Cell main pressing mechanism; 402. Cell pre-pressing mechanism; 403. First cell transfer robot; 404. Second cell transfer robot. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] like Figure 1-4 As shown, the present invention provides an L-shaped dual-station stacking machine for lithium battery cells, including a stacking machine table 1, a left correction system 2, a cell hot pressing system 4, and a right correction system 3 sequentially arranged on the stacking machine table 1. The left correction system 2 and the right correction system 3 are respectively arranged on both sides of the stacking machine table 1, wherein the cell hot pressing system 4 is arranged between the left correction system 2 and the right correction system 3. The stacking machine table 1 includes an automatic lifting loading hopper, a positive electrode hopper, a negative electrode hopper, a positive electrode stacking station, a negative electrode stacking station, a separator scraping mechanism, a material picking mechanism, a separator cutting mechanism, and an automatic lifting stacking unloading mechanism. The automatic lifting loading hopper is used to place the upper coated electrode sheet, the lower coated electrode sheet, the positive electrode sheet, and the negative electrode sheet. The positive electrode hopper and the negative electrode hopper are arranged horizontally with the automatic lifting loading hopper. The material picking mechanism includes a positive electrode picking and unloading robot, a negative electrode sheet picking and unloading robot, and a vacuum adsorption module.

[0027] In this embodiment, during use, the upper coated electrode (positive electrode), lower coated electrode (positive electrode), positive electrode, and negative electrode are manually placed into the automatic lifting and feeding hoppers of each electrode. After the electrode spacer is installed, the workstation on the stacking machine 1 stops at the positive electrode stacking position to wait for feeding. Pressing the control panel 101 starts automatic operation. The (first) upper coated electrode (positive electrode) is picked up from the upper coated electrode (positive electrode) lifting hopper by the positive electrode material handling robot and placed on the stacking correction mechanism platform for stacking correction. After correction, the robot picks up the material from the correction platform and places it on the workstation. The stacking machine 1 then opens the vacuum to hold the (first) upper coated electrode (positive electrode). The diaphragm cutting mechanism also includes a diaphragm scraping component, which includes a diaphragm scraper. The diaphragm is scraped from right to left onto the (first) coated electrode (positive electrode) sheet. At the same time, the station moves from the positive electrode stack position to the negative electrode stack position to perform diaphragm correction.

[0028] The (second) negative electrode sheet picking and unloading robot places the (second) negative electrode sheet on the workstation, where it presses the electrode sheet and the separator. The workstation then moves the electrode sheet and separator together to the positive electrode stacking position. The positive electrode picking robot places the (third) positive electrode sheet on the workstation, where it presses the electrode sheet and the separator. This process is repeated until the required number of electrode sheets for stacking is reached. The (last) coating sheet is then placed on the workstation by the robot for pressing and separator cutting. A stepper motor moves and pulls the separator back. The gripping robot then picks up the battery cell from the workstation, flips the stacked battery cell, and sends it to the battery cell hot pressing picking robot at the picking station. The battery cell hot pressing robot picks up the battery cell and places it in the battery cell hot pressing station for hot pressing (the maximum pressure of the gas-liquid booster cylinder is 3 tons). After hot pressing, the unloading robot picks up the battery cell from the hot pressing station and places it in the automatic lifting stacking unloading station. When the stacking height reaches the upper limit, the battery cell is manually collected. This dual-station stacking machine enables multiple stations to be used, reducing equipment size, allowing one person to operate multiple machines, lowering labor costs, improving production efficiency, and meeting the dimensional requirements for L-type cell stacking production.

[0029] The left correction system 2 includes a left negative electrode calibration table 201, a left positive electrode moving calibration table 202, a left single-sided coated electrode transfer robot 203, a left stacking mechanism 204, and a left reverse diaphragm mechanism 205. The left negative electrode calibration table 201 is connected to the left positive electrode moving calibration table 202. The right correction system 3 includes a right positive electrode moving calibration table 301, a right negative electrode calibration table 302, a right single-sided coated electrode transfer robot 303, a right stacking mechanism 304, and a right reverse diaphragm mechanism 305. The right positive electrode moving calibration table 301 is connected to the right negative electrode calibration table 302. The left correction system 2 and the right correction system 3 also include a calibration station, in which the upper coated electrode is placed in the calibration station from the automatic lifting and lowering feeding hopper by the positive electrode picking and placing robot for stacking calibration.

[0030] Traditional positive electrode calibration tables are stationary, with positive and negative material bins and upper and lower coating single-sided sheet material bins arranged vertically. The material retrieval time for the first and last stacked cells is twice as long as normal stacking, resulting in prolonged retrieval time and instability of the lead screw. In this embodiment, the positive electrode calibration table uses horizontally arranged positive and negative material bins and upper and lower coating single-sided sheet material bins. A robotic arm first picks up the coated single-sided sheets and waits for the calibration table to move. Once the first and last cells have been calibrated and moved to the position where the robotic arm has picked up the coated single-sided sheets, the robotic arm places the coated single-sided sheets onto the calibration table, and the calibration table returns to zero. This reduces the time for the electrode moving platform to retrieve coated single-sided sheets and the lead screw length, improving stacking time and increasing production efficiency. After the reverse diaphragm mechanism stacks the battery cells, it cuts the diaphragm with a hot cutter. Then, a transfer robot picks up the battery cells from the stacking table. The reverse diaphragm mechanism is driven by a cylinder to rotate the rotating rod 90 degrees. The stepper motor drives the reverse diaphragm to pull it back to the stacking table, straightens the diaphragm, and begins stacking.

[0031] The battery cell hot pressing system 4 includes a preheating platform, a battery cell main pressing mechanism 401, a battery cell pre-pressing mechanism 402, a first battery cell transfer robot 403, and a second battery cell transfer robot 404. The battery cell main pressing mechanism 401 is connected to the battery cell pre-pressing mechanism 402. The first battery cell transfer robot 403 is used for the main pressing and pre-pressing transfer of the battery cell, and the second battery cell transfer robot 404 is used for the left and right transfer of the battery cell. The preheating platform is also equipped with a battery cell hot pressing robot and a spring reset structure.

[0032] Traditional cell pre-compression rotary platforms rely on cell-driven indexing wheel rotation mechanisms, which are costly. Furthermore, the pre-compression platform can cause the stacked cells to move, leading to cell delamination and defective products when a robotic arm removes the cells. This embodiment employs a cylinder rack and pinion rotation mechanism, significantly reducing costs. Additionally, the preheating platform in this embodiment is equipped with a spring for self-resetting to prevent delamination and improve yield.

[0033] Furthermore, the stacking machine 1 is also equipped with a control screen 101. The control screen 101 is connected to the diaphragm scraping mechanism, the positive electrode picking and placing robot, the negative electrode picking and placing robot, the vacuum adsorption module, the diaphragm cutting mechanism, and the automatic lifting stacking and unloading mechanism. The diaphragm cutting mechanism includes a diaphragm scraper and a hot cutting knife. The diaphragm scraper attaches the diaphragm to the upper coated electrode. The negative electrode is placed on the diaphragm by the negative electrode picking and placing robot and stacked with the upper coated electrode.

[0034] Furthermore, the vacuum adsorption module includes a vacuum suction cup, which is mounted on the positive electrode picking and placing robot and the negative electrode picking and placing robot. The positive electrode picking and placing robot and the negative electrode picking and placing robot sequentially place the upper coated electrode, the lower coated electrode, the positive electrode and the negative electrode on the calibration station onto the preheating platform for pressing.

[0035] Furthermore, both the left reverse diaphragm mechanism 205 and the right reverse diaphragm mechanism 305 include a stepper motor. The stepper motor is connected to the diaphragm cutting mechanism. The left reverse diaphragm mechanism 205 stretches the diaphragm in the reverse direction by translation through the stepper motor, and the right reverse diaphragm mechanism 305 stretches the diaphragm in the reverse direction by translation through the stepper motor.

[0036] Furthermore, the preheating platform is also equipped with a cell hot pressing station, a cell station, and a cell clamping robot. The cell clamping robot places the stacked cells in the cell station by flipping them over. The cell hot pressing robot clamps the cells in the cell station for hot pressing. The automatic lifting and stacking unloading mechanism is connected to the cell hot pressing robot. The automatic lifting and stacking unloading mechanism includes an automatic lifting and stacking unloading station, which is also equipped with a sensor.

[0037] Furthermore, the left anti-diaphragm mechanism 205 and the right anti-diaphragm mechanism 305 also include a cylinder and a rotating rod, the rotating rod having a rotation angle of 90°.

[0038] It should be further noted that both the upper coated electrode and the lower coated electrode are positive electrodes.

[0039] Furthermore, both the left single-sided coated electrode transfer robot 203 and the right single-sided coated electrode transfer robot 303 are connected to a walking module. The left single-sided coated electrode transfer robot 203 and the right single-sided coated electrode transfer robot 303 can move along the Z-axis, Y-axis and X-axis of the stacking machine table 1 through the walking module.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A lithium battery cell L-shaped dual-station stacking machine, characterized in that: The device includes a stacking machine, a left alignment system, a cell hot pressing system, and a right alignment system sequentially arranged on the stacking machine. The left and right alignment systems are respectively located on both sides of the stacking machine, and the cell hot pressing system is located between the left and right alignment systems. The stacking machine includes an automatic lifting loading hopper, a positive electrode hopper, a negative electrode hopper, a positive electrode stacking station, a negative electrode stacking station, a diaphragm scraping mechanism, a material handling mechanism, a diaphragm cutting mechanism, and an automatic lifting stacking unloading mechanism. The automatic lifting loading hopper is used to place the upper coated electrode sheet, the lower coated electrode sheet, the positive electrode sheet, and the negative electrode sheet. The positive electrode hopper and the negative electrode hopper are arranged horizontally with the automatic lifting loading hopper. The material handling mechanism includes a positive electrode material handling robot, a negative electrode material handling robot, and a vacuum adsorption module. The left correction system includes a left negative electrode calibration table, a left positive electrode moving calibration table, a left single-sided coated electrode transfer robot, a left stacking mechanism, and a left reverse diaphragm mechanism. The left negative electrode calibration table is connected to the left positive electrode moving calibration table. The right correction system includes a right positive electrode moving calibration table, a right negative electrode calibration table, a right single-sided coated electrode transfer robot, a right stacking mechanism, and a right reverse diaphragm mechanism. The right positive electrode moving calibration table is connected to the right negative electrode table. The left and right correction systems also include a calibration station, where the top-coated electrode is placed in the calibration station from the automatic lifting and lowering feeding hopper by the positive electrode picking and placing robot for stacking calibration. The battery cell hot pressing system includes a preheating platform, a main battery cell pressing mechanism, a pre-pressing battery cell mechanism, a first battery cell transfer robot, and a second battery cell transfer robot. The main battery cell pressing mechanism is connected to the pre-pressing battery cell mechanism. The first battery cell transfer robot is used for main and pre-pressing transfer of the battery cell, and the second battery cell transfer robot is used for left and right transfer of the battery cell. The preheating platform is also equipped with a battery cell hot pressing robot and a spring reset structure.

2. The lithium battery cell L-type dual-station stacking machine according to claim 1, characterized in that: The stacking machine is also equipped with a control screen, which is connected to the diaphragm scraping mechanism, the positive electrode picking and placing robot, the negative electrode picking and placing robot, the vacuum adsorption module, the diaphragm cutting mechanism, and the automatic lifting stacking and unloading mechanism. The diaphragm cutting mechanism includes a diaphragm scraper and a hot cutting knife. The diaphragm scraper attaches the diaphragm to the upper coated electrode. The negative electrode is placed on the diaphragm by the negative electrode picking and placing robot and stacked with the upper coated electrode.

3. The lithium battery cell L-type dual-station stacking machine according to claim 1, characterized in that: The vacuum adsorption module includes a vacuum suction cup, which is mounted on the positive electrode picking and placing robot and the negative electrode picking and placing robot. The positive electrode picking and placing robot and the negative electrode picking and placing robot sequentially place the upper coated electrode, the lower coated electrode, the positive electrode and the negative electrode on the calibration station onto the preheating platform for pressing.

4. The lithium battery cell L-type dual-station stacking machine according to claim 1, characterized in that: Both the left and right reverse diaphragm mechanisms include stepper motors, which are connected to the diaphragm cutting mechanism. The left reverse diaphragm mechanism uses the stepper motor to stretch the diaphragm in the reverse direction by translation, and the right reverse diaphragm mechanism uses the stepper motor to stretch the diaphragm in the reverse direction by translation.

5. The lithium battery cell L-type dual-station stacking machine according to claim 1, characterized in that: The preheating platform is also equipped with a cell hot pressing station, a cell station, and a cell clamping robot. The cell clamping robot places the stacked cells in the cell station by flipping them over. The cell hot pressing robot clamps the cells in the cell station for hot pressing. The automatic lifting and stacking unloading mechanism is connected to the cell hot pressing robot. The automatic lifting and stacking unloading mechanism includes an automatic lifting and stacking unloading station, which is also equipped with a sensor.

6. The lithium battery cell L-type dual-station stacking machine according to claim 4, characterized in that: The left and right reverse diaphragm mechanisms also include cylinders and rotating rods, with the rotating rods rotating at an angle of 90°.

7. The lithium battery cell L-type dual-station stacking machine according to claim 1, characterized in that: Both the upper coated electrode and the lower coated electrode are positive electrodes.

8. The lithium battery cell L-type dual-station stacking machine according to claim 1, characterized in that: Both the left and right single-sided coated electrode transfer robots are connected to a walking module, which allows them to move along the Z, Y, and X axes of the stacking machine via the walking module.

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