Cutting and rubberizing control method and device for battery roll core diaphragm

Abstract

The invention discloses a cutting and rubberizing control method and device for a battery roll core diaphragm, and the cutting control method for the battery roll core diaphragm comprises the steps: calculating the actual total rotation angle of a winding needle from a first tab to a penultimate tab on a set pole piece of a battery roll core; calculating the difference value between the actual total rotation angle of the winding needle and the total rotation angle of the corresponding perfect winding core; and when the difference value exceeds a set angle threshold value, calculating an actual total rotation angle of the battery roll core diaphragm according to the difference value, and taking the actual total rotation angle as a reference for cutting the diaphragm. According to the invention, the diaphragm in the battery roll core can be accurately cut, so that the yield of winding and rubberizing is effectively improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery production, and particularly relates to a method and device for controlling the cutting and gluing of a separator of a battery core. Background Art

[0002] With the increasingly fierce competition in the lithium battery industry, the requirements for cost control are getting higher and higher, and correspondingly, the requirements for production yield are also continuously increasing. In the same lithium battery core, there are a positive electrode sheet, a negative electrode sheet, and a separator. The winding equipment winds the three materials together and then cuts them. At the end of the cutting, glue is applied to ensure that the core does not come loose. At the same time, the glue has a QR code (Quick Response Code, two-dimensional bar code) storing various information of the corresponding core. Under the existing process level, due to the influence of the thickness fluctuations of the positive and negative electrode sheets and the separator, the tabs of the core will be misaligned, while the glue application position remains fixed. In order to transfer the core normally, the core will be manually or mechanically kneaded. When the tabs are aligned, the glue application position has changed, and the glue application position and the tab misalignment are not bound, resulting in the inability of the subsequent process scanners to scan the code, and thus being discharged as defective products. As energy materials become rarer and rarer, from the perspective of protecting resources and saving material costs, it is very meaningful to reduce waste in the process. Summary of the Invention

[0003] To solve the deficiencies in the prior art, the present invention provides a method and device for controlling the cutting and gluing of a separator of a battery core, which can accurately cut the separator in the battery core, thereby effectively improving the yield of winding and gluing, and thus reducing the process cost.

[0004] To achieve the above object, the technical solution adopted by the present invention is: In the first aspect, a method for controlling the cutting of a separator of a battery core is provided, including: calculating the actual total rotation angle of the winding needle from the first tab to the penultimate tab on the set electrode sheet of the battery core; calculating the difference between the actual total rotation angle of the winding needle and the rotation total angle of the corresponding perfect core; when the difference exceeds the set angle threshold, calculating the actual total rotation angle of the separator of the battery core according to the difference as the reference for cutting the separator.

[0005] The above technical solution can accurately cut the separator in the battery core by calculating the difference between the actual total rotation angle of the winding needle and the rotation total angle of the corresponding perfect core, and calculating the actual total rotation angle of the separator according to the difference as the reference for cutting the separator, thereby effectively improving the yield of winding and gluing, and thus reducing the process cost.

[0006] Further, the set electrode sheet is the negative electrode sheet.

[0007] In the above technical solution, by calculating the actual total rotation angle of the winding needle based on the negative electrode sheet, it is convenient to accurately calculate the actual total rotation angle of the winding needle and improve the calculation accuracy.

[0008] Furthermore, the actual total rotation angle of the separator of the battery core is equal to the sum of the rotation angle of the separator in the corresponding perfect core and the difference value.

[0009] In the above technical solution, by calculating the actual total rotation angle of the separator of the battery core through the sum of the rotation angle of the separator in the corresponding perfect core and the difference value, a method for calculating the actual separator cutting reference is given, and the calculation method is accurate, improving the cutting accuracy of the separator of the battery core.

[0010] Furthermore, the tab misalignment value of the perfect core is zero.

[0011] In the above technical solution, by setting the tab misalignment value of the perfect core, the calculation reference is determined. Since the program preset in the device is based on the theoretical calculation value, there is a difference from the actual operation. Here, based on this difference, the tab misalignment problem is corrected theoretically.

[0012] In a second aspect, a cutting control device for the separator of a battery core is provided, including: a reference calculation module for calculating the actual total rotation angle of the winding needle from the first tab to the penultimate tab on the set electrode sheet of the battery core; a difference calculation module for calculating the difference between the actual total rotation angle of the winding needle and the total rotation angle of the corresponding perfect core; and a separator calculation module for, when the difference exceeds the set angle threshold, calculating the actual total rotation angle of the separator of the battery core according to the difference as the reference for cutting the separator.

[0013] In the above technical solution, by setting a reference calculation module, a difference calculation module and a separator calculation module, the cutting control method for the separator of the battery core is transformed into a cutting control device for the separator of the battery core, realizing product transformation, achieving accurate cutting of the separator of the battery core, thereby effectively improving the yield of winding and gluing, and thus reducing the process cost.

[0014] In a third aspect, a gluing control method for a battery core is provided, including: obtaining the cutting reference of the separator by using the cutting control method for the separator of the battery core described in the first aspect; cutting the separator according to the cutting reference; and gluing the battery core after cutting the separator.

[0015] In the above technical solution, by using the cutting control method for the separator of the battery core described in the first aspect to obtain the cutting reference of the separator, performing the cutting operation under this reference and completing the gluing can effectively improve the yield of winding and gluing, and thus reduce the process cost.

[0016] Fourthly, a battery core pasting control device is provided, including: a diaphragm cutting reference unit for obtaining a cutting reference of the diaphragm by using the cutting control method of the battery core diaphragm described in the first aspect; a cutting unit for cutting the diaphragm according to the cutting reference; and a pasting unit for pasting the battery core after cutting the diaphragm.

[0017] Through the above technical solution, by means of the diaphragm cutting reference unit, the cutting unit and the pasting unit, the product transformation from the battery core pasting control method to the battery core pasting control device is realized, which can effectively improve the yield of winding and pasting, thereby reducing the process cost.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention calculates the total actual rotation angle of the winding needle from the first tab to the penultimate tab on the set electrode sheet of the battery core; calculates the difference between the total actual rotation angle of the winding needle and the rotation angle of the corresponding perfect core; when the difference exceeds the set angle threshold, calculates the total actual rotation angle of the diaphragm of the battery core according to the difference as the cutting reference for the diaphragm; can accurately cut the diaphragm in the battery core, thereby effectively improving the yield of winding and pasting, and thus reducing the process cost. Description of the Drawings

[0019] Figure 1 is a schematic flowchart of the implementation process of a battery core pasting control method provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a battery positive electrode sheet, a negative electrode sheet and a diaphragm wound on a winding needle in an embodiment of the present invention; Figure 3 is a schematic structural diagram of a battery core in an embodiment of the present invention, where (a) is a perfect core and (b) is an actual core; Figure 4 is a schematic plan view of a negative electrode sheet in a battery core in an embodiment of the present invention; Figures 2 to 4 In the figure: 11, diaphragm; 12, positive electrode sheet; 13, negative electrode sheet; 2, winding needle; 31, perfect core; 32, core; 4, tape; 41, two-dimensional code; 5, tab. Detailed Embodiment

[0020] The present invention will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and should not be used to limit the protection scope of the present invention.

[0021] Embodiment 1 As Figures 2 to 4As shown, the separator 11, the positive electrode sheet 12, and the negative electrode sheet 13 are arranged in the order of separator 11, positive electrode sheet 12, separator 11, and negative electrode sheet 13, and then wound around the winding pin 2 to form a battery core. After winding, the separator 11 needs to be cut, and the tail of the separator 11 is fixed with the tape 4 to finally become the core 32. A two-dimensional code 41 (QR code) is set on the tape 4, and various production data of the core are bound.

[0022] During the winding process, due to the thickness changes of the separator 11, the positive electrode sheet 12, and the negative electrode sheet 13 themselves, the ear 5 cannot be aligned after winding. The separator 11 is cut and taped according to the parameters of the perfect core 31. In this way, if the misalignment of the ear 5 exceeds a certain range, the core will be discharged as a defective product; usually, in order to align the ear 5, the core 32 is kneaded manually / machine, but after kneading, the taping position of the tape 4 exceeds the process range, resulting in the subsequent inability to scan the two-dimensional code 41 normally, and thus it is discharged as a defective product.

[0023] In the present invention, by selecting the negative electrode sheet 13, since usually the negative electrode sheet 13 has one more ear 5 than the positive electrode sheet 12 according to the battery design, the winding needle rotation angles a of the d1 to dn-1 ears 5 in the current production are collected and compared with the winding needle rotation angles b of the d1 to dn-1 ears 5 of the perfect core 31 to obtain c = a - b. The rotation angle of the separator 11 compensated by the difference c is then used for cutting and taping. That is, the present invention provides a method for controlling the cutting of the separator of a battery core, including: (a) Calculating the actual total rotation angle of the winding needle from the first ear to the penultimate ear on the set electrode sheet of the battery core; (b) Calculating the difference between the actual total rotation angle of the winding needle and the total rotation angle of the corresponding perfect core; (c) When the difference exceeds the set angle threshold, calculating the actual total rotation angle of the separator of the battery core according to the difference as the benchmark for cutting the separator.

[0024] In the present invention, the set electrode sheet is the negative electrode sheet; the actual total rotation angle of the separator of the battery core is equal to the sum of the rotation angle of the separator in the corresponding perfect core and the difference; the ear misalignment value of the perfect core is zero.

[0025] The traditional solution often faces the situation of choosing either ear misalignment or taping position. As a result, if one is unqualified, both are unqualified. The present invention performs joint closed-loop control on the two items, which will avoid the phenomenon of choosing one of them, improve the qualified rate of the lithium battery manufacturing process, and at the same time, improve the qualified rate of code scanning, thereby reducing costs and bringing economic benefits.

[0026] Embodiment 2 Based on the method for controlling the cutting of a battery core diaphragm described in Embodiment 1, this embodiment provides a device for controlling the cutting of a battery core diaphragm, including: A reference calculation module, configured to calculate the total actual rotation angle of the winding needle from the first tab to the penultimate tab on the set pole piece of the battery core. A difference calculation module, configured to calculate the difference between the total actual rotation angle of the winding needle and the total rotation angle of the corresponding perfect core. A diaphragm calculation module, configured to, when the difference exceeds a set angle threshold, calculate the total actual rotation angle of the battery core diaphragm according to the difference, as the reference for cutting the diaphragm.

[0027] Wherein, the set pole piece is the negative pole piece; the total actual rotation angle of the battery core diaphragm is equal to the sum of the rotation angle of the diaphragm in the corresponding perfect core and the difference; the tab misalignment value of the perfect core is zero.

[0028] Embodiment 3 Based on the method for controlling the cutting of a battery core diaphragm described in Embodiment 1, this embodiment provides a method for controlling the pasting of a battery core, including: obtaining the cutting reference of the diaphragm by using the method for controlling the cutting of the battery core diaphragm described in Embodiment 1; cutting the diaphragm according to the cutting reference; and pasting the battery core after cutting the diaphragm.

[0029] As Figure 1 shown, it is the implementation process of a method for controlling the pasting of a battery core provided by the present invention, specifically including: S1. The current core starts to wind. S2. Calculate the total rotation angle of the winding needle from the first tab to the penultimate tab. S3. Calculate the difference in the total rotation angle from the perfect core (with a tab misalignment value of 0). S4. If the difference exceeds the requirement, feedback to the total rotation angle of the winding needle and diaphragm. S5. The actual total rotation angle of the diaphragm = the rotation angle of the diaphragm of the perfect core + the difference in the rotation angle of the pole piece. S6. After cutting the diaphragm, complete the pasting. S7. The program ends.

[0030] Embodiment 4 Based on the method for controlling the cutting of a battery core diaphragm described in Embodiment 1 and the method for controlling the pasting of a battery core described in Embodiment 3, this embodiment provides a device for controlling the pasting of a battery core, including: A diaphragm cutting reference unit, configured to obtain the cutting reference of the diaphragm by using the method for controlling the cutting of the battery core diaphragm described in Embodiment 1; A cutting unit, configured to cut the diaphragm according to the cutting reference The gluing unit is used to glue the battery core after cutting the diaphragm.

[0031] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A method for controlling the cutting of a battery core membrane, characterized in that: include: Calculate the actual total rotation angle of the winding needle from the first pole ear to the second to last pole ear on the set pole piece of the battery winding core; Calculate the difference between the actual total rotation angle of the winding needle and the total rotation angle of the corresponding perfect winding core; When the difference exceeds the set angle threshold, the actual total rotation angle of the battery core separator is calculated according to the difference, which serves as a reference for cutting the separator.

2. The method for controlling the cutting of the battery core membrane according to claim 1, characterized in that: The electrode is set to be a negative electrode.

3. The method for controlling the cutting of a battery core membrane according to claim 1, characterized in that: The actual total rotation angle of the battery core separator is equal to the sum of the rotation angle of the separator in the corresponding perfect core and the difference.

4. The method for controlling the cutting of a battery core membrane according to claim 1, characterized in that: The tab misalignment value of the perfect winding core is zero.

5. A cutting control device for a battery core membrane, characterized in that: include: A reference calculation module is used to calculate the actual total rotation angle of the winding needle from the first pole ear to the second to last pole ear on the set pole piece of the battery winding core; A difference calculation module, used to calculate the difference between the actual total rotation angle of the winding needle and the total rotation angle of the corresponding perfect winding core; The diaphragm calculation module is used to calculate the actual total rotation angle of the battery core diaphragm according to the difference when the difference exceeds a set angle threshold, as a basis for cutting the diaphragm.

6. The cutting control device for battery core separator according to claim 5, characterized in that: The electrode is set to be a negative electrode.

7. The cutting control device for battery core separator according to claim 5, characterized in that: The actual total rotation angle of the battery core separator is equal to the sum of the rotation angle of the separator in the corresponding perfect core and the difference.

8. The cutting control device for battery core separator according to claim 5, characterized in that: The tab misalignment value of the perfect winding core is zero.

9. A battery core glue control method, characterized in that: include: The cutting control method of the battery core separator according to any one of claims 1 to 4 is used to obtain the cutting reference of the separator; Cutting the diaphragm according to the cutting reference; Glue the battery roll core after cutting the diaphragm.

10. A battery core glue control device, characterized in that: include: A separator cutting reference unit, used to obtain a separator cutting reference by using the battery core separator cutting control method according to any one of claims 1 to 4; A cutting unit, used for cutting the diaphragm according to the cutting reference The gluing unit is used to glue the battery core after the separator is cut.

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