Multi-station pole piece automatic stacking system and stacking method

Abstract

The invention relates to a multi-station pole piece automatic stacking system and stacking method, and belongs to the technical field of new energy batteries, and the multi-station pole piece automatic stacking system comprises a positive pole piece stacking assembly, a negative pole piece stacking assembly, a stacking table, a multi-degree-of-freedom micropositioner, N + N groups of visual positioning systems and a multi-rotor linear motor module. The multi-degree-of-freedom micropositioner is mounted at the bottom of the stacking table, and the positive plate stacking assembly and the negative plate stacking assembly are tightly arranged on the two sides of the stacking table respectively. Each of the positive pole piece stacking assembly and the negative pole piece stacking assembly comprises a deviation rectifying table and a large-stroke motion table. And the multi-rotor linear motor modules are respectively arranged above the positive plate stacking assembly and the negative plate stacking assembly. The device is suitable for stacking a plurality of battery cells at the same time, rapid carrying and deviation correction of the pole pieces are achieved through the positive pole piece stacking assembly and the negative pole piece stacking assembly, high-precision staggered stacking of the positive pole pieces and the negative pole pieces is achieved through the multi-degree-of-freedom micropositioner and the multi-rotor linear electronic module, the stacking efficiency, precision and flush degree of the battery cell pole pieces are improved, and the product quality is improved. The quality of the battery is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of production and preparation of blade battery cells, and specifically relates to a multi-station pole piece automated stacking system and a stacking method. Background Art

[0002] At present, the demand for lithium batteries in the new energy market is increasing year by year, and the current manufacturing process of blade battery cells includes a stacking process for battery electrode sheets. This process is to alternate the positive electrode sheets and the negative electrode sheets with the separator in sequence to make a Z-shape stack. After repeating this process many times to reach a certain number of layers, a battery chip is formed.

[0003] Most existing blade battery stacking equipment adopts a single-station method. Only one electrode piece can be transported and placed at a time through the transfer device, and multiple electrode pieces cannot be placed on the stacking table at the same time to stack multiple electrode pieces at the same time. For example, the method proposed in patent CN116864823A can only produce one battery cell at a time, with high production costs and slow speed, which is difficult to meet market demand. Later, a solution for stacking multiple cells at the same time was proposed, such as patent CN220189720U, but the disadvantage is that it is difficult to ensure the flatness of multiple layers of electrode pieces when stacking multiple cells at the same time, and it is impossible to correct the deviation of multiple electrode pieces at the same time. The above problems affect the production efficiency of battery cells, so there is an urgent need to provide a solution. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a multi-station electrode automatic stacking system and stacking method.

[0005] To achieve the above object, the present invention adopts the following scheme: A multi-station electrode sheet automatic stacking system, the stacking system comprises: N groups of positive electrode sheet stacking components, N groups of negative electrode sheet stacking components, N groups of stacking tables, N groups of multi-degree-of-freedom micro-motion tables, N+N groups of visual positioning systems and two groups of multi-motor linear motor modules; wherein, The multi-degree-of-freedom micro-motion platform is installed at the bottom of the stacking platform and is used to adjust the position and angle of the electrode sheets on the stacking platform; the positive electrode sheet stacking assembly and the negative electrode sheet stacking assembly are closely arranged on both sides of the stacking platform, and the positive electrode sheet stacking assembly and the negative electrode sheet stacking assembly both include a deviation correction platform and a large-stroke motion platform; The correction table is installed above the large-stroke motion table to correct the positive and negative pole sheets. The large-stroke motion table moves back and forth between the pole sheet picking position and the pole sheet correction position to transport the positive and negative pole sheets. The two groups of multi-motor linear motor modules are respectively arranged above the positive pole sheet stacking assembly and the negative pole sheet stacking assembly, and N groups of vacuum suction cups are correspondingly arranged under the multi-motor linear electronic modules to grasp the pole sheets. The visual positioning system is arranged on the side of the two groups of multi-motor linear motors close to the stacking table to collect pole sheet images to obtain the position and angle deviation of the pole sheets.

[0006] Furthermore, a connecting mechanism is provided between the deflection correction platform and the large-stroke motion platform. The connecting mechanism consists of bolts and a connecting plate. The connecting plate is fixed to the large-stroke motion platform by bolt connection, and the deflection correction platform is fixed to the connecting plate by threaded connection.

[0007] Furthermore, a vacuum suction cup is correspondingly installed at the bottom of the multi-motor linear motor module, and the installation position is parallel to the plane of the correction platform, which is used to grasp and release the pole piece.

[0008] Furthermore, the visual positioning system is installed on one side of the two sets of multi-motor linear motor modules close to the stacking table, and the main light of the camera is perpendicular to the vacuum suction cup grasping plane.

[0009] The present application also provides a multi-station electrode sheet automated stacking method, including the multi-station electrode sheet automated stacking system as described above, wherein the stacking method steps are as follows: S1: N groups of negative electrode sheet stacking assemblies are closely arranged, and the previous process device is placed at the negative electrode sheet taking position and N negative electrode sheets are placed on the deviation correction table of the corresponding negative electrode sheet stacking assembly; S2: N groups of large-stroke motion tables drive the correction table above them to support the negative electrode sheet and move it to the negative electrode sheet correction position; S3: The visual positioning system obtains the image of each negative electrode sheet respectively, calculates the direction offset of each electrode sheet and feeds it back to the correction platform, which corrects the direction and angle of the negative electrode sheet it supports; S4: The vacuum suction cup absorbs and fixes the pole piece, and the multi-motor linear motor module drives it to move to the pole piece stacking position. The visual positioning system collects images of the pole pieces above the stacking table to obtain the position and posture deviation of the pole pieces; S5: The visual positioning system feeds back the deviation value to the corresponding multi-degree-of-freedom fine-motion stage, which calibrates the position and adjusts the posture of the electrode it supports, and the vacuum suction cup releases the stacked negative electrode; S6: N groups of positive electrode sheet stacking assemblies are closely arranged, and the previous process device is placed at the positive electrode sheet taking position and N positive electrode sheets are placed on the deviation correction table of the corresponding positive electrode sheet stacking assembly; S7: The N-group long-stroke motion table drives the correction table above it to support the positive electrode sheet and move it to the positive electrode sheet correction position; S8: The visual positioning system obtains the image of each electrode piece respectively, calculates the direction offset of each positive electrode piece and feeds it back to the correction platform, which corrects the direction and angle of the positive electrode piece it supports; S9: The vacuum suction cup absorbs and fixes the pole piece, and the multi-motor linear motor module drives it to move to the pole piece stacking position. The visual positioning system collects images of the pole pieces above the stacking table to obtain the position and posture deviation of the pole pieces. S10: The visual positioning system feeds back the deviation value to the corresponding multi-degree-of-freedom fine-motion stage, and the multi-degree-of-freedom fine-motion stage performs position calibration and posture adjustment on the electrode piece it supports, and the vacuum suction cup releases the stacked positive electrode piece.

[0010] Furthermore, the steps between S1 and S5 and the steps between S6 and S10 are performed alternately and simultaneously to meet the alternating high-speed stacking of the positive and negative electrode sheets.

[0011] Furthermore, the movements of the large-stroke motion stage and the multi-degree-of-freedom micro-motion stage are coordinated and controlled, with the position of the initial negative electrode sheet at the bottom layer of the battery cell being used as a positioning reference.

[0012] Beneficial effects of the present invention: The multi-station electrode sheet automated stacking system and stacking method provided by the present invention are suitable for stacking multiple battery cells at the same time. The positive electrode sheet stacking assembly and the negative electrode sheet stacking assembly are used to realize rapid electrode sheet transportation and deviation correction, and a visual positioning system is used to collect images of each electrode sheet to obtain position angle errors, thereby utilizing a multi-degree-of-freedom micro-motion stage and a multi-motor linear electronic module to realize high-precision staggered stacking of positive and negative electrode sheets, significantly improving the efficiency, accuracy and flatness of battery cell electrode sheet stacking. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the multi-station electrode automatic stacking system of the present invention; Figure 2 It is a schematic diagram of a stacking assembly in a multi-station electrode automatic stacking system of the present invention; Figure 3 A schematic diagram of a collaborative control strategy in a multi-station electrode automatic stacking system of the present invention; Reference numerals: 1. Negative pole multi-motor linear motor module; 2. Negative pole visual positioning system; 3. Negative pole sheet stacking assembly; 4. Stacking table; 5. Positive pole sheet stacking assembly; 6. Positive pole visual positioning system; 7. Positive pole multi-motor linear motor module; 8. Multi-degree-of-freedom micro-motion table; 201. Correction table; 202. Large-stroke motion table; DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0016] Embodiment 1:

[0017] like Figure 1 As shown, this embodiment provides a multi-station electrode sheet automatic stacking system, including: N groups of positive electrode sheet stacking assemblies, N groups of negative electrode sheet stacking assemblies, N groups of stacking tables, N groups of multi-degree-of-freedom micro-motion tables, N+N groups of visual positioning systems and two groups of multi-motor linear motor modules. Take N as 8, that is, 8 groups of positive electrode sheet stacking assemblies 5, 8 groups of negative electrode sheet stacking assemblies 3, 8 groups of stacking tables 4, 8 groups of multi-degree-of-freedom micro-motion tables 8, 8 groups of negative electrode visual positioning systems 2, 8 groups of positive electrode visual positioning systems 6, negative electrode multi-motor linear motor module 1 and positive electrode multi-motor linear motor module 7.

[0018] Any set of pole piece stacking components includes: a deflection correction table 201 and a large-stroke motion table 202 , and the deflection correction table 201 is installed above the large-stroke motion table 202 .

[0019] The negative pole multi-motor linear motor module 1 and the positive pole multi-motor linear motor module 7 are arranged above the negative pole sheet stack assembly 3 and the positive pole sheet stack assembly 5 .

[0020] There are 8 sets of vacuum suction cups installed under any set of multi-motor linear motors, which are used to grab the pole pieces supported above the correction table of the corresponding stacking assembly.

[0021] The negative pole visual positioning system 2 is installed on the right side of the negative pole multi-motor linear motor module 1 , and the positive pole visual positioning system 6 is installed on the left side of the positive pole multi-motor linear motor module 7 .

[0022] A connecting mechanism is provided between the deflection correction platform and the long-stroke motion platform. The connecting mechanism consists of bolts and a connecting plate. The connecting plate is fixed to the long-stroke motion platform by bolt connection, and the deflection correction platform is fixed to the connecting plate by threaded connection.

[0023] Furthermore, a vacuum suction cup is correspondingly installed at the bottom of the multi-motor linear motor module, and the installation position is parallel to the plane of the correction platform, which is used to grasp and release the pole piece.

[0024] Furthermore, the visual positioning system is installed on one side of the two sets of multi-motor linear motor modules close to the stacking table, and the main light of the camera is perpendicular to the vacuum suction cup grasping plane.

[0025] Embodiment 2:

[0026] A stacking method of a multi-station electrode automatic stacking system, applicable to the aforementioned multi-station electrode automatic stacking system, comprises the following steps: S1: N groups of negative electrode sheet stacking assemblies 3 are closely arranged, and the previous process device places N negative electrode sheets at a time on the deflection correction table 201 corresponding to the negative electrode sheet stacking assembly 3 at the negative electrode sheet taking position; S2: The N-group long-stroke motion table 202 drives the correction table 201 above it to support the negative electrode sheet and move it to the negative electrode sheet correction position; S3: The negative electrode visual positioning system 2 obtains the image of each electrode piece respectively, calculates the direction offset of each electrode piece and feeds it back to the correction platform 201, and the correction platform 201 corrects the direction and angle of the negative electrode piece it supports.

[0027] S4: The vacuum suction cup absorbs and fixes the pole piece, and the negative pole multi-motor linear motor module 1 drives it to move to the pole piece stacking position. The negative pole visual positioning system 2 collects images of the pole pieces above the stacking table to obtain the position and posture deviation of the pole pieces.

[0028] S5: The negative electrode visual positioning system 2 feeds back the deviation value to the corresponding multi-degree-of-freedom fine-motion stage 8, and the multi-degree-of-freedom fine-motion stage 8 performs position calibration and posture adjustment on the electrode piece it supports, and the vacuum suction cup releases the stacked negative electrode piece.

[0029] S6: N groups of positive electrode sheet stacking assemblies 5 are closely arranged, and the previous process device places N positive electrode sheets at a time on the deflection correction table 201 corresponding to the positive electrode sheet stacking assembly 5 at the positive electrode sheet taking position; S7: The N-group long-stroke motion table 202 drives the deflection correction table 201 above it to support the positive electrode sheet and move it to the positive electrode sheet deflection correction position; S8: The positive electrode visual positioning system 6 obtains the image of each pole piece respectively, calculates the direction offset of each pole piece and feeds it back to the correction platform 201, and the correction platform 201 corrects the direction and angle of the positive pole piece it supports.

[0030] S9: The vacuum suction cup absorbs and fixes the pole piece, and the positive pole multi-motor linear motor module 7 drives it to move to the pole piece stacking position. The positive pole visual positioning system 6 collects the image of the pole piece above the stacking table 4 to obtain the position and posture deviation of the pole piece.

[0031] S10: The positive electrode visual positioning system 6 feeds back the deviation value to the corresponding multi-degree-of-freedom fine-motion stage 8, and the multi-degree-of-freedom fine-motion stage 8 performs position calibration and posture adjustment on the electrode piece it supports, and the vacuum suction cup releases the stacked positive electrode piece.

[0032] In some specific embodiments, Figure 3 As shown, the movement of the pole piece long-stroke motion table and the multi-degree-of-freedom micro-motion table is coordinated and controlled. First, the position of the initial negative pole piece located at the bottom layer of the battery cell is used as the positioning reference, and the long-stroke motion table realizes the long-stroke transportation of the positive and negative pole pieces. By controlling two rows of multi-motor linear motor modules and cooperating with precision vacuum suction cups, high-speed and high-precision transportation of the positive and negative pole pieces is realized. At the same time, the camera matrix at the same workstation cooperates with the correction table and the multi-degree-of-freedom micro-motion table to calibrate the pole piece position and adjust the posture, realizing high-precision motion control at the micron level, so that the positive and negative pole pieces at 8 workstations can be stacked at high speed and with high precision at one time.

[0033] In other more specific embodiments, a connection mechanism is provided between the deflection correction table 201 and the long-stroke motion table 202, and the connection mechanism is composed of bolts and a connection plate. The connection plate is fixed to the long-stroke motion table 202 by bolt connection, and the deflection correction table 201 is fixed to the connection plate by threaded connection. Vacuum suction cups are installed at the bottom of the multi-motor linear motor modules 1 and 7 respectively, and the installation position is parallel to the plane of the deflection correction table 201, which is used to grasp and release the pole pieces. The negative pole visual positioning system 2 is installed on the right side of the negative pole multi-motor linear motor module 1, and the positive pole visual positioning system 6 is installed on the left side of the positive pole multi-motor linear motor module 7. And the main light of the camera is perpendicular to the vacuum suction cup grasping plane. The steps between S1 to S5 and the steps between S6 to S10 are performed alternately and simultaneously to meet the alternating high-speed stacking of positive and negative pole pieces.

[0034] In summary, the multi-station electrode sheet automated stacking system provided by the present invention is suitable for stacking multiple battery cells at the same time. The positive electrode sheet stacking assembly and the negative electrode sheet stacking assembly are used to realize rapid electrode sheet transportation and deviation correction. The multi-degree-of-freedom micro-motion table and the multi-motor linear electronic module are used to realize high-precision staggered stacking of positive and negative electrode sheets, which significantly improves the efficiency, accuracy and flatness of battery cell electrode sheet stacking and ensures the quality of the battery.

[0035] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and various improvements or modifications can be made to these embodiments without departing from the principles and essence of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. All components not specified in the present invention can be implemented using existing technologies.

Claims

1. A multi-station electrode automatic stacking system, characterized in that: The stacking system includes: N groups of positive electrode stacking assemblies, N groups of negative electrode stacking assemblies, N groups of stacking tables, N groups of multi-degree-of-freedom micro-motion tables, N+N groups of visual positioning systems and two groups of multi-motor linear motor modules; wherein, The multi-degree-of-freedom micro-motion platform is installed at the bottom of the stacking platform and is used to adjust the position and angle of the electrode sheets on the stacking platform; the positive electrode sheet stacking assembly and the negative electrode sheet stacking assembly are closely arranged on both sides of the stacking platform, and the positive electrode sheet stacking assembly and the negative electrode sheet stacking assembly both include a deviation correction platform and a large-stroke motion platform; The correction table is installed above the large-stroke motion table to correct the positive and negative pole sheets. The large-stroke motion table moves back and forth between the pole sheet picking position and the pole sheet correction position to transport the positive and negative pole sheets. The two groups of multi-motor linear motor modules are respectively arranged above the positive pole sheet stacking assembly and the negative pole sheet stacking assembly, and N groups of vacuum suction cups are correspondingly arranged under the multi-motor linear electronic modules to grasp the pole sheets. The visual positioning system is arranged on the side of the two groups of multi-motor linear motors close to the stacking table to collect pole sheet images to obtain the position and angle deviation of the pole sheets.

2. A multi-station electrode automatic stacking system according to claim 1, characterized in that: A connecting mechanism is provided between the deflection correction platform and the large-stroke motion platform. The connecting mechanism consists of bolts and a connecting plate. The connecting plate is fixed to the large-stroke motion platform by bolt connection, and the deflection correction platform is fixed to the connecting plate by threaded connection.

3. The multi-station electrode automatic stacking system according to claim 1, characterized in that: A vacuum suction cup is correspondingly installed at the bottom of the multi-motor linear motor module, and the installation position is parallel to the plane of the correction table, which is used to grasp and release the pole piece.

4. The multi-station electrode automatic stacking system according to claim 1, characterized in that: The visual positioning system is installed on one side of the two sets of multi-motor linear motor modules close to the stacking table, and the main light of the camera is perpendicular to the vacuum suction cup grasping plane.

5. A multi-station electrode automatic stacking method, characterized in that: The multi-station electrode automatic stacking system comprises the multi-station electrode automatic stacking system according to any one of claims 1 to 4, wherein the stacking method comprises the following steps: S1: N groups of negative electrode sheet stacking assemblies are closely arranged, and the previous process device is placed at the negative electrode sheet taking position and N negative electrode sheets are placed on the deviation correction table of the corresponding negative electrode sheet stacking assembly; S2: N groups of large-stroke motion tables drive the correction table above them to support the negative electrode sheet and move it to the negative electrode sheet correction position; S3: The visual positioning system obtains the image of each negative electrode sheet respectively, calculates the direction offset of each electrode sheet and feeds it back to the correction platform, which corrects the direction and angle of the negative electrode sheet it supports; S4: The vacuum suction cup absorbs and fixes the pole piece, and the multi-motor linear motor module drives it to move to the pole piece stacking position. The visual positioning system collects images of the pole pieces above the stacking table to obtain the position and posture deviation of the pole pieces; S5: The visual positioning system feeds back the deviation value to the corresponding multi-degree-of-freedom fine-motion stage, which calibrates the position and adjusts the posture of the electrode it supports, and the vacuum suction cup releases the stacked negative electrode; S6: N groups of positive electrode sheet stacking assemblies are closely arranged, and the previous process device is placed at the positive electrode sheet taking position and N positive electrode sheets are placed on the deviation correction table of the corresponding positive electrode sheet stacking assembly; S7: The N-group long-stroke motion table drives the correction table above it to support the positive electrode sheet and move it to the positive electrode sheet correction position; S8: The visual positioning system obtains the image of each electrode piece respectively, calculates the direction offset of each positive electrode piece and feeds it back to the correction platform, which corrects the direction and angle of the positive electrode piece it supports; S9: The vacuum suction cup absorbs and fixes the pole piece, and the multi-motor linear motor module drives it to move to the pole piece stacking position. The visual positioning system collects images of the pole pieces above the stacking table to obtain the position and posture deviation of the pole pieces. S10: The visual positioning system feeds back the deviation value to the corresponding multi-degree-of-freedom fine-motion stage, and the multi-degree-of-freedom fine-motion stage performs position calibration and posture adjustment on the electrode piece it supports, and the vacuum suction cup releases the stacked positive electrode piece.

6. A multi-station electrode automatic stacking method according to claim 5, characterized in that: The steps from S1 to S5 and the steps from S6 to S10 are performed alternately and simultaneously to meet the alternating high-speed stacking of positive and negative electrode sheets.

7. A multi-station electrode automatic stacking method according to claim 5, characterized in that: The movements of the large-stroke motion stage and the multi-degree-of-freedom micro-motion stage are coordinated and controlled, with the position of the initial negative electrode sheet at the bottom layer of the battery cell as the positioning reference.

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