Lamination device

Abstract

The utility model provides a lamination device. The lamination device comprises: a positive plate preparation unit for providing a positive plate; the negative plate preparation unit is used for providing a negative plate; the appearance detection unit comprises a defect detection part and a size detection part; the resistance detection unit is used for detecting the resistance of the positive plates and / or the negative plates and classifying the positive plates and / or the negative plates according to the measured resistance values, and the resistance values of the positive plates and / or the negative plates belonging to the same category are in the same value range; and the lamination unit is used for receiving the positive plates and the negative plates of the same type and completing lamination operation. According to the lamination device provided by the technical scheme of the utility model, the problem of poor lamination core consistency caused by possible inconsistency of film resistors of positive and negative electrode unit sheets in produced lamination cores when the conventional lamination device is used for lamination can be solved.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and more specifically, to a stacking device. Background Technology

[0002] Lithium-ion batteries have become the preferred power source for portable electronic devices, electric vehicles, and large-scale energy storage systems due to their high energy density, long cycle life, and low self-discharge rate. In the manufacturing process of lithium-ion batteries, battery stacking is one of the key technological steps, directly affecting performance indicators such as capacity, internal resistance, and consistency. Current lithium-ion battery stacking methods mainly employ "Z"-type stacking technology. This technology stacks the positive electrode, separator, and negative electrode in a specific order and angle to form the core of the battery, namely the battery cell. However, although "Z"-type stacking technology performs well in improving the structural stability and space utilization of battery cells, it still faces some challenges in actual production. Using existing stacking devices, the film resistance of the positive and negative electrode units in the produced cell may be inconsistent, resulting in poor cell consistency. Utility Model Content

[0003] The main objective of this invention is to provide a stacking device that can solve the problem that the film resistance of the positive and negative electrode units in the stacked core produced by using existing stacking devices may be inconsistent, resulting in poor core consistency.

[0004] To achieve the above objectives, this utility model provides a stacking device, comprising: a positive electrode preparation unit for providing positive electrode sheets; a negative electrode preparation unit for providing negative electrode sheets; an appearance inspection unit, including a defect detection unit and a size detection unit; a resistance detection unit for detecting the resistance of the positive electrode sheets and / or negative electrode sheets, and classifying the positive electrode sheets and / or negative electrode sheets according to the measured resistance values, wherein the resistance values ​​of positive electrode sheets and / or negative electrode sheets belonging to the same category are within the same value range; and a stacking unit for receiving positive electrode sheets and negative electrode sheets of the same category and completing the stacking operation.

[0005] The above settings can improve the consistency of the cells obtained after lamination by the lamination unit.

[0006] Furthermore, the stacking device also includes a thickness detection unit. The resistance detection unit and the thickness detection unit are arranged sequentially along the electrode conveying direction. The thickness detection unit is used to detect the thickness of positive electrode sheets and / or negative electrode sheets with resistance values ​​belonging to the same category, and to perform secondary classification of positive electrode sheets and / or negative electrode sheets with resistance values ​​belonging to the same category based on the measured thickness values. The thickness values ​​of positive electrode sheets and / or negative electrode sheets with thickness values ​​belonging to the same category are within the same value range. The stacking unit is used to receive positive electrode sheets and negative electrode sheets with thickness values ​​belonging to the same category and complete the stacking operation.

[0007] The above settings can further improve the consistency of the cells obtained after lamination by the lamination unit.

[0008] Furthermore, the stacking device also includes a thickness detection unit. The thickness detection unit and the resistance detection unit are arranged sequentially along the conveying direction of the electrode sheets. The thickness detection unit is used to detect the thickness of the positive electrode sheet and / or negative electrode sheet, and classify the positive electrode sheet and / or negative electrode sheet according to the measured thickness value. The resistance detection unit is used to detect the resistance of the positive electrode sheet and / or negative electrode sheet whose thickness values ​​belong to the same category, and perform secondary classification of the positive electrode sheet and / or negative electrode sheet whose thickness values ​​belong to the same category according to the measured resistance value.

[0009] The above settings can further improve the consistency of the cells obtained after lamination by the lamination unit.

[0010] Furthermore, the thickness detection unit includes a thickness detection section, a first robotic arm, and at least two first temporary storage sections. The thickness detection section is used to detect the thickness of the positive electrode sheet and / or the negative electrode sheet. Each first temporary storage section is used to temporarily store different types of positive electrode sheets or negative electrode sheets. The first robotic arm is used to transport the positive electrode sheet and / or the negative electrode sheet to the first temporary storage section of the corresponding type.

[0011] The above settings enable the detection and classification of electrode thickness.

[0012] Furthermore, the resistance detection unit includes a resistance detection section, a second robotic arm, and at least two second temporary storage sections. The resistance detection section is used to detect the resistance of the positive electrode and / or the negative electrode. Each second temporary storage section is used to temporarily store different types of positive or negative electrode. The second robotic arm is used to transport the positive electrode and / or the negative electrode to the second temporary storage section of the corresponding type.

[0013] The above settings enable resistance detection and classification of the electrodes.

[0014] Furthermore, the resistance detection unit includes a resistance detection section and a thickness detection unit. The resistance detection section is used to detect the resistance of the positive electrode and / or negative electrode, and classify the positive electrode and / or negative electrode according to the measured resistance value. The thickness detection unit is used to detect the thickness of the positive electrode and / or negative electrode with the same resistance value, and classify the positive electrode and / or negative electrode with the same resistance value a second time according to the measured thickness value. The thickness values ​​of the positive electrode and / or negative electrode with the same thickness value are within the same value range. The stacking unit is used to receive the positive electrode and negative electrode with the same thickness value and complete the stacking operation.

[0015] The above settings can further improve the consistency of the cells obtained after lamination by the lamination unit.

[0016] Furthermore, both the positive electrode preparation unit and the negative electrode preparation unit include a cutting unit and an unwinding unit. The unwinding unit is used to unwind the material roll, and the cutting unit is located at the output end of the unwinding unit and is used to cut the material roll.

[0017] The above settings enable the cutting of electrode sheets.

[0018] Furthermore, the lamination device also includes at least two correction units, with at least one correction unit provided on each of the opposite sides of the lamination unit.

[0019] With the above settings, at least two electrodes can be corrected simultaneously, which can improve the stacking efficiency.

[0020] Furthermore, the stacking device also includes a rejection unit, which is configured in correspondence with the appearance inspection unit. The rejection unit is used to reject the unqualified positive electrode and / or negative electrode detected by the appearance inspection unit.

[0021] With the above settings, electrode sheets that are defective or dimensionally incorrect as detected by the appearance inspection unit can be rejected.

[0022] Furthermore, there are two appearance inspection units, two resistance detection units, and two stacking units. The positive electrode preparation unit, one of the two appearance inspection units, and one of the two resistance detection units form a first preparation branch. The negative electrode preparation unit, the other of the two appearance inspection units, and the other of the two resistance detection units form a second preparation branch. The first preparation branch and the second preparation branch are spaced apart along the first direction. The two stacking units are arranged side by side between the first preparation branch and the second preparation branch.

[0023] The above settings can improve stacking efficiency.

[0024] The present invention includes a positive electrode preparation unit, a negative electrode preparation unit, an appearance inspection unit, and a resistance detection unit. A defect detection unit detects defects on the electrodes (positive and / or negative electrodes), and a size detection unit measures the size of the electrodes to determine if the size meets requirements. The resistance detection unit measures the resistance of the electrodes and classifies them according to the measured resistance values, grouping electrodes with resistance values ​​within the same range together. Since the classification is based on resistance values, positive and negative electrodes of the same category refer to identical positive and negative electrodes with resistance values ​​within the same range. A stacking unit receives positive and negative electrodes of the same category and performs Z-shaped stacking. By including the resistance detection unit, the present invention classifies the electrodes before stacking, thus improving the consistency of the cells obtained after stacking. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof.

[0026] In the picture:

[0027] Figure 1 A schematic diagram of the stacking device according to an embodiment of the present invention is shown.

[0028] The above figures include the following reference numerals:

[0029] 10. Positive electrode preparation unit; 20. Negative electrode preparation unit; 30. Thickness detection unit; 40. Resistance detection unit; 41. Second conveyor belt; 50. Stacking unit; 60. Cutting unit; 70. Unwinding unit; 80. Rejection unit; 90. First conveyor belt; 100. Tracking unit. Detailed Implementation

[0030] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] like Figure 1 As shown, this utility model provides a stacking device, which includes: a positive electrode preparation unit 10 for providing positive electrode sheets; a negative electrode preparation unit 20 for providing negative electrode sheets; an appearance inspection unit, including a defect detection unit and a size detection unit; a resistance detection unit 40 for detecting the resistance of the positive electrode sheets and / or negative electrode sheets, and classifying the positive electrode sheets and / or negative electrode sheets according to the measured resistance values, wherein the resistance values ​​of positive electrode sheets and / or negative electrode sheets belonging to the same category are within the same value range; and a stacking unit 50 for receiving positive electrode sheets and negative electrode sheets of the same category and completing the stacking operation.

[0032] In this embodiment, the defect detection unit is used to detect defects (such as dark marks, bright spots, dark spots, bubbles, etc.) on the electrode sheets (positive electrode sheets and / or negative electrode sheets), and the size detection unit is used to detect the size of the electrode sheets. The size detection unit can determine whether the size of the electrode sheets meets the requirements. The resistance detection unit 40 is used to detect the resistance of the electrode sheets and can classify the electrode sheets according to the measured resistance values, that is, classifying the electrode sheets whose resistance values ​​are within the same range into one category. Since the classification is based on the range of resistance values, positive and negative electrode sheets of the same category refer to positive and negative electrode sheets whose resistance values ​​are within the same range. The stacking unit 50 is used to receive positive and negative electrode sheets of the same category and can perform Z-shaped stacking. By setting the resistance detection unit 40, the electrode sheets can be classified before stacking, which can improve the consistency of the cells obtained after the stacking operation by the stacking unit 50.

[0033] In one embodiment, the appearance detection unit is a CCD camera.

[0034] In one embodiment of this utility model, the stacking device further includes a thickness detection unit 30, a resistance detection unit 40, and a thickness detection unit 30 arranged sequentially along the electrode conveying direction. The thickness detection unit 30 is used to detect the thickness of positive and / or negative electrode sheets with resistance values ​​belonging to the same category, and to perform secondary classification of positive and / or negative electrode sheets with resistance values ​​belonging to the same category based on the measured thickness values. The thickness values ​​of positive and / or negative electrode sheets with thickness values ​​belonging to the same category are within the same value range. The stacking unit 50 is used to receive positive and negative electrode sheets with thickness values ​​belonging to the same category and complete the stacking operation.

[0035] In this embodiment, the thickness detection unit 30 is used to detect the thickness of the electrode sheets (positive electrode sheets and / or negative electrode sheets). The thickness detection unit 30 can determine whether the electrode sheet thickness meets the requirements. Since the positive electrode sheets and / or negative electrode sheets, after being classified by the resistance detection unit 40, are then subjected to thickness detection by the thickness detection unit 30, and those with thickness values ​​within the same range are classified into the same category, electrode sheets with thickness values ​​belonging to the same category also have resistance values ​​belonging to the same category. This further improves the consistency of the battery cells obtained after the stacking operation by the stacking unit 50.

[0036] like Figure 1As shown, in one embodiment of the present invention, the stacking device further includes a thickness detection unit 30. The thickness detection unit 30 and the resistance detection unit 40 are arranged sequentially along the conveying direction of the electrode sheets. The thickness detection unit 30 is used to detect the thickness of the positive electrode sheet and / or the negative electrode sheet, and classify the positive electrode sheet and / or the negative electrode sheet according to the measured thickness value. The resistance detection unit 40 is used to detect the resistance of the positive electrode sheet and / or the negative electrode sheet whose thickness values ​​belong to the same category, and perform secondary classification of the positive electrode sheet and / or the negative electrode sheet whose thickness values ​​belong to the same category according to the measured resistance value.

[0037] In this embodiment, the thickness detection unit 30 is used to detect the thickness of the electrode sheet, and the thickness detection unit 30 can determine whether the electrode sheet thickness meets the requirements. Since the positive electrode sheet and / or negative electrode sheet after being classified by the thickness detection unit 30 are then subjected to resistance detection by the resistance detection unit 40, and the resistance values ​​belonging to the same range are classified into the same category, the electrode sheets with resistance values ​​belonging to the same category also have the same thickness value, which can further improve the consistency of the battery cell obtained after the stacking operation by the stacking unit 50.

[0038] In one embodiment of the present invention, the thickness detection unit 30 includes a thickness detection section, a first robotic arm, and at least two first temporary storage sections. The thickness detection section is used to detect the thickness of the positive electrode sheet and / or the negative electrode sheet. Each first temporary storage section is used to temporarily store different types of positive electrode sheets or negative electrode sheets. The first robotic arm is used to transport the positive electrode sheet and / or the negative electrode sheet to the first temporary storage section of the corresponding type.

[0039] The above settings enable the detection and classification of electrode thickness.

[0040] In one embodiment, the thickness detection unit is an ultrasonic thickness gauge.

[0041] In one embodiment of the present invention, the resistance detection unit 40 includes a resistance detection section, a second robotic arm, and at least two second temporary storage sections. The resistance detection section is used to detect the resistance of the positive electrode and / or the negative electrode. Each second temporary storage section is used to temporarily store different types of positive electrode or negative electrode. The second robotic arm is used to transport the positive electrode and / or the negative electrode to the second temporary storage section of the corresponding type.

[0042] The above settings enable resistance detection and classification of the electrodes.

[0043] In one embodiment, the resistance detection unit is a resistance detector.

[0044] In one embodiment, the second temporary storage section is a box.

[0045] In one embodiment, the resistance detection unit 40 includes a resistance detection section and a thickness detection unit 30. The resistance detection section is used to detect the resistance of the positive electrode and / or negative electrode, and classify the positive electrode and / or negative electrode according to the measured resistance value. The thickness detection unit 30 is used to detect the thickness of the positive electrode and / or negative electrode with the same resistance value, and classify the positive electrode and / or negative electrode with the same resistance value a second time according to the measured thickness value. The thickness values ​​of the positive electrode and / or negative electrode with the same thickness value are within the same range.

[0046] In this embodiment, the resistance detection unit 40 can simultaneously perform resistance detection and thickness detection on the electrode. During detection, resistance detection is performed first, followed by thickness detection. Since the positive and / or negative electrode sheets classified by the resistance detection unit 40 are then subjected to thickness detection by the thickness detection unit 30, and those with thickness values ​​within the same range are classified into the same category, the electrode sheets with thickness values ​​in the same category also have resistance values ​​in the same category. This further improves the consistency of the battery cells obtained after the stacking operation by the stacking unit 50.

[0047] like Figure 1 As shown, in one embodiment of the present invention, both the positive electrode preparation unit 10 and the negative electrode preparation unit 20 include a cutting unit 60 and an unwinding unit 70. The unwinding unit 70 is used to unwind the material roll, and the cutting unit 60 is disposed at the discharge end of the unwinding unit 70 and is used to cut the material roll.

[0048] In this embodiment, the material roll can be a positive electrode material roll or a negative electrode material roll. The cutting unit 60 cuts the positive electrode material roll to form a positive electrode sheet, and the cutting unit 60 cuts the negative electrode material roll to form a negative electrode sheet. Through the above settings, the cutting of the electrode sheet can be achieved.

[0049] It should be noted that the unwinding unit 70 and the cutting unit 60 adopt existing technology, and their specific structures will not be described in detail here.

[0050] like Figure 1 As shown, in one embodiment of the present invention, the stacking device further includes at least two correction units 100, and at least one correction unit 100 is provided on each of the opposite sides of the stacking unit 50.

[0051] With the above settings, at least two electrodes can be corrected simultaneously, which can improve the stacking efficiency.

[0052] It should be noted that the correction unit 100 adopts existing technology, and its specific structure will not be described in detail here.

[0053] like Figure 1As shown, in one embodiment of the present invention, the stacking device further includes a rejection unit 80, which is configured in correspondence with the appearance inspection unit. The rejection unit 80 is used to reject the unqualified positive electrode and / or negative electrode detected by the appearance inspection unit.

[0054] With the above settings, electrode sheets that are defective or dimensionally incorrect as detected by the appearance inspection unit can be rejected.

[0055] like Figure 1 As shown, in one embodiment of the present invention, there are two appearance inspection units, two resistance detection units 40, and two stacking units 50. The positive electrode preparation unit 10, one of the two appearance inspection units, and one of the two resistance detection units 40 form a first preparation branch. The negative electrode preparation unit 20, the other of the two appearance inspection units, and the other of the two resistance detection units 40 form a second preparation branch. The first preparation branch and the second preparation branch are spaced apart along a first direction. The two stacking units 50 are arranged side by side between the first preparation branch and the second preparation branch.

[0056] The above settings can improve stacking efficiency.

[0057] like Figure 1 As shown, in one embodiment of the present invention, the stacking device further includes two first conveyor belts 90 and four second conveyor belts 41. The two first conveyor belts 90 are respectively arranged corresponding to the first material preparation branch and the second material preparation branch. The first conveyor belts 90 are used to transport the electrode sheets to the appearance inspection unit and the resistance detection unit 40. The two second conveyor belts 41 are arranged corresponding to the first conveyor belts 90 of the first material preparation branch, and the other two second conveyor belts 41 are arranged corresponding to the first conveyor belts 90 of the second material preparation branch. The second conveyor belts 41 are used to transport the electrode sheets on the corresponding first conveyor belts 90 to the stacking unit 50.

[0058] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: A positive electrode preparation unit, a negative electrode preparation unit, an appearance inspection unit, and a resistance detection unit are provided. The defect detection unit is used to detect defects on the electrode sheets (positive and / or negative electrode sheets), and the size detection unit is used to detect the size of the electrode sheets, thereby determining whether the electrode sheet size meets the requirements. The resistance detection unit is used to detect the resistance of the electrode sheets and can classify the electrode sheets according to the measured resistance values, that is, grouping those with resistance values ​​within the same range into one category. Since the classification is based on the range of resistance values, positive and negative electrode sheets of the same category refer to positive and negative electrode sheets with resistance values ​​within the same range. The stacking unit is used to receive positive and negative electrode sheets of the same category and can perform Z-shaped stacking. By providing the resistance detection unit, this application can classify the electrode sheets before stacking, thus improving the consistency of the cells obtained after stacking by the stacking unit.

[0059] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0060] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stacking device, characterized in that, include: A positive electrode preparation unit (10) is used to provide positive electrode sheets; A negative electrode preparation unit (20) is used to provide negative electrode sheets. Both the positive electrode preparation unit (10) and the negative electrode preparation unit (20) include a cutting unit (60) and an unwinding unit (70). The unwinding unit (70) is used to unwind the material roll. The cutting unit (60) is located at the discharge end of the unwinding unit (70) and is used to cut the material roll. The appearance inspection unit includes a defect inspection section and a size inspection section, wherein the appearance inspection unit is a CCD camera; The resistance detection unit (40) includes a resistance detection section, which is used to detect the resistance of the positive electrode and / or the negative electrode, and classify the positive electrode and / or the negative electrode according to the measured resistance value. The resistance values ​​of the positive electrode and / or the negative electrode belonging to the same category are in the same value range. The resistance detection section is a resistance detector. The stacking unit (50) is used to receive the positive electrode and the negative electrode of the same type and to complete the stacking operation.

2. The stacking device according to claim 1, characterized in that, The stacking device further includes a thickness detection unit (30). The resistance detection unit (40) and the thickness detection unit (30) are arranged sequentially along the electrode conveying direction. The thickness detection unit (30) is used to detect the thickness of the positive electrode and / or the negative electrode with the same resistance value, and to perform secondary classification of the positive electrode and / or the negative electrode with the same resistance value according to the measured thickness value. The thickness values ​​of the positive electrode and / or the negative electrode with the same thickness value are in the same range. The stacking unit (50) is used to receive the positive electrode and the negative electrode with the same thickness value and complete the stacking operation.

3. The stacking device according to claim 1, characterized in that, The stacking device further includes a thickness detection unit (30), and the thickness detection unit (30) and the resistance detection unit (40) are arranged sequentially along the conveying direction of the electrode sheets. The thickness detection unit (30) is used to detect the thickness of the positive electrode sheet and / or the negative electrode sheet, and classify the positive electrode sheet and / or the negative electrode sheet according to the measured thickness value. The resistance detection unit (40) is used to detect the resistance of the positive electrode sheet and / or the negative electrode sheet whose thickness value belongs to the same category, and perform secondary classification of the positive electrode sheet and / or the negative electrode sheet whose thickness value belongs to the same category according to the measured resistance value.

4. The stacking device according to claim 3, characterized in that, The thickness detection unit (30) includes a thickness detection section, a first robotic arm, and at least two first temporary storage sections. The thickness detection section is used to detect the thickness of the positive electrode and / or the negative electrode. Each of the first temporary storage sections is used to temporarily store the positive electrode or the negative electrode of different categories. The first robotic arm is used to transport the positive electrode and / or the negative electrode to the first temporary storage section of the corresponding category.

5. The stacking apparatus according to claim 1 or 2, characterized in that, The resistance detection unit (40) further includes a second robotic arm and at least two second temporary storage units. Each second temporary storage unit is used to temporarily store different types of positive electrode sheets or negative electrode sheets. The second robotic arm is used to transport the positive electrode sheet and / or the negative electrode sheet to the second temporary storage unit of the corresponding type.

6. The stacking apparatus according to claim 1, characterized in that, The resistance detection unit (40) further includes a thickness detection unit (30), which is used to detect the thickness of the positive electrode and / or the negative electrode with the same resistance value, and to perform secondary classification of the positive electrode and / or the negative electrode with the same resistance value according to the measured thickness value. The thickness values ​​of the positive electrode and / or the negative electrode with the same thickness value are in the same range. The stacking unit (50) is used to receive the positive electrode and the negative electrode with the same thickness value and to complete the stacking operation.

7. The stacking apparatus according to any one of claims 1 to 3, characterized in that, The stacking device further includes at least two correction units (100), and at least one correction unit (100) is provided on each of the opposite sides of the stacking unit (50).

8. The stacking apparatus according to any one of claims 1 to 3, characterized in that, The stacking device further includes a rejection unit (80), which is configured in correspondence with the appearance inspection unit. The rejection unit (80) is used to reject the unqualified positive electrode and / or negative electrode detected by the appearance inspection unit.

9. The stacking apparatus according to any one of claims 1 to 4, characterized in that, There are two of each of the appearance inspection unit, the resistance detection unit (40) and the stacking unit (50). The positive electrode preparation unit (10), one of the two appearance inspection units and one of the two resistance detection units (40) form a first preparation branch. The negative electrode preparation unit (20), the other of the two appearance inspection units and the other of the two resistance detection units (40) form a second preparation branch. The first preparation branch and the second preparation branch are spaced apart along a first direction. The two stacking units (50) are arranged side by side between the first preparation branch and the second preparation branch.

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