Method, device and battery production system for quickly determining tab pitch size

Abstract

The embodiment of the present application discloses a kind of method for quickly determining tab spacing size, device and battery production system, for solving the technical problem of low efficiency and waste material in prior art, which needs to carry out core test paper and observe tab alignment condition multiple times to confirm the distance between tabs.The embodiment of the present application includes the following steps: S1, obtain the cross-sectional view of the winding core formed by the diaphragm and the tab of the full tab winding;S2, mark the preset tab position on the cross-sectional view of the winding core, then measure the cross-sectional view to obtain the distance between every two adjacent preset tab positions in the length direction of the tab.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, in particular to a method and device for quickly determining the distance between tabs and a battery production system. BACKGROUND

[0002] In recent years, the industry related to new energy has developed very rapidly. Lithium-ion battery technology has been widely applied in the fields of electric vehicles, base station energy storage, electric tools, etc. The market demand for its performance and capacity has further increased. In order to improve the power performance, more and more batteries currently use full-tab technology. On this basis, in order to further improve the energy density, multi-tab technology has gradually evolved. Multi-tab technology can be realized by stacking or winding process. Since the current stacking process has the disadvantages of low production efficiency and more powder falling from the pole piece, the multi-tab winding technology is still the most mainstream at present.

[0003] Since the arc length of the pole piece in the wound core differs greatly at the inner and outer corner, the distance between the tabs is not a fixed value. Although the existing technology has an empirical formula for the distance between the tabs, which can be used as a reference for technical personnel, there is still a difference between the model and the actual situation. Therefore, the production of the current multi-tab battery must go through one or more trial winding processes to determine the die-cutting size of the pole piece. The specific process is as follows: first, the pole piece is die-cut according to the existing empirical formula for the distance between the tabs, and a plurality of tabs arranged along the length direction of the pole piece are obtained on the pole piece. Then, the pole piece and the separator are wound for trial. Next, the technical personnel check the alignment of the tabs of the wound core. If the tabs are aligned in the thickness direction of the wound core, the distance between the tabs can be determined, and the batch die-cutting of the pole piece can be carried out. If the alignment is not good, the technical personnel need to adjust the distance between the tabs one by one, and then die-cut the new pole piece according to the adjusted data. Then, the alignment of the tabs is detected by winding. If the alignment is still not good, the process is repeated until the tabs of the wound core are completely aligned, and then the distance between the tabs is confirmed, and the subsequent batch die-cutting of the pole piece can be started. As can be seen from the above specific process, the material, equipment standby and personnel energy are all wasted, and the production efficiency of the existing battery is greatly reduced.

[0004] Therefore, it has become an important research topic for those skilled in the art to find a technical solution to solve the above technical problems. SUMMARY

[0005] The embodiments of the present application disclose a method and device for quickly determining the distance between tabs and a battery production system, which are used to solve the technical problems in the prior art that the distance between the tabs needs to be confirmed by winding the core for trial and observing the alignment of the tabs, resulting in low efficiency and waste of materials.

[0006] The embodiment of the present application provides a method for quickly determining the size of tab spacing, comprising the following steps:

[0007] S1, obtaining a cross-sectional view of a winding cell formed by winding of a diaphragm and full-tab tab;

[0008] S2, marking preset tab positions on the cross-sectional view of the winding cell, and then measuring the cross-sectional view to obtain the distance between every two adjacent preset tab positions in the length direction of the tab.

[0009] Optionally, the step S1 specifically comprises:

[0010] The cross-sectional view of the winding cell formed by winding of the diaphragm and the full-tab tab is obtained by an image capturing device.

[0011] Optionally, the image capturing device is an optical lens device, an ultrasonic imaging device, an X-ray device or a micro-industrial CT device.

[0012] Optionally, the step S2 specifically comprises:

[0013] According to the tab position, size and quantity required by the battery specification, a preset quantity of preset tab positions are marked on the cross-sectional view of the winding cell, and then the cross-sectional view is measured to obtain the distance between every two adjacent preset tab positions in the length direction of the tab.

[0014] Optionally, the quantity n of the preset tab positions is greater than or equal to 2, and the plurality of preset tab positions are arranged in the length direction of the tab.

[0015] Optionally, the step S2 further comprises:

[0016] The cross-sectional view is measured, and the distance between the preset tab position closest to the head end of the tab and the head end of the tab and the distance between the preset tab position closest to the tail end of the tab and the tail end of the tab in the length direction of the tab are obtained.

[0017] Optionally, in the step S2, the cross-sectional view is measured by image size measurement software to obtain the distance between every two adjacent preset tab positions in the length direction of the tab.

[0018] The embodiment of the present application provides a device for quickly determining the size of tab spacing, comprising:

[0019] An image acquisition module is configured to obtain a cross-sectional view of a winding cell formed by winding of a diaphragm and full-tab tab;

[0020] An image analysis processing module is configured to mark preset tab positions on a cross-sectional view of the wound battery cell, and then measure the cross-sectional view to obtain a distance between every two adjacent preset tab positions in a length direction of the tab.

[0021] The battery production system comprises a control unit, a die-cutting unit, a winding unit, and a device for quickly determining tab pitch size.

[0022] The die-cutting unit and the device for quickly determining tab pitch size are in communication connection with the control unit.

[0023] Optionally, the die-cutting unit is configured to perform die-cutting processing on the tab to form tabs on the tab.

[0024] The winding unit is configured to wind the separator and the tab after the tabs are formed to form a wound battery cell.

[0025] The control unit is configured to receive a control signal from the device for quickly determining tab pitch size and control the die-cutting unit and the winding unit to operate.

[0026] From the above technical solution, it can be seen that the embodiments of the present application have the following advantages:

[0027] In the embodiment, the cross-sectional view of the wound battery cell is marked with preset tab positions, and then the cross-sectional view is measured to obtain a distance between every two adjacent preset tab positions in a length direction of the tab, so that the die-cutting size of the tab can be accurately and quickly confirmed, and problems such as material waste, low production efficiency, and large quality fluctuation caused by repeated trial winding, standby equipment, and manual errors can be effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0029] Figure 1 A flowchart of a method for quickly determining tab pitch size provided in the embodiments of the present application;

[0030] Figure 2 A cross-sectional view of a wound battery cell and a tab in a method for quickly determining tab pitch size provided in the embodiments of the present application;

[0031] Figure 3This is a schematic diagram of the structure of the electrode sheet and the diaphragm before winding in a method for quickly determining the electrode tab spacing size provided in an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of a battery production system provided in an embodiment of the present invention;

[0033] Illustrations: A, Electrode; A1, First Electrode; A2, Second Electrode; B, Winded Cell; C, Cross-sectional View of Winded Cell; E, Separator; J, Preset Tab Position; J1, First Preset Tab Position; Jn-1, (n-1)th Preset Tab Position; Jn, nth Preset Tab Position; Dn-1, Distance from Jn to Jn-1; K1, Distance from J1 to the Beginning End of Electrode; Kn, Distance from Jn to the End of Electrode; h, Distance the Separator is Raised. Detailed Implementation

[0034] This invention discloses a method, apparatus, and battery production system for rapidly determining the distance between tabs, which solves the technical problem in the prior art that requires multiple core test rolls and observation of tab alignment to confirm the distance between tabs, resulting in low efficiency and material waste.

[0035] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely 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.

[0036] Example 1

[0037] Please see Figures 1 to 3 The present invention provides a method for rapidly determining the electrode spacing size, comprising the following steps:

[0038] S1. Obtain a cross-sectional view of a wound cell consisting of a diaphragm and full-tab electrode sheets. Specifically, the full-tab electrode sheets can be considered as uncut electrode sheets in the prior art.

[0039] S2. Mark the predetermined tab positions on the cross-sectional view of the wound cell, and then measure the cross-sectional view to obtain the distance between every two adjacent predetermined tab positions along the length direction of the electrode sheet. Specifically, please refer to... Figure 2 One of the distances measured in the cross-sectional view is Dn-1, which is the distance between two adjacent preset electrode positions along the length of the electrode.

[0040] In the embodiment, the tab position is preset by marking the cross-sectional view of the wound cell, and then the cross-sectional view is measured to obtain the distance between every two adjacent preset tab positions in the length direction of the tab, so that the die-cut size of the tab can be accurately and quickly confirmed, and the problems of material waste, low production efficiency, and large quality fluctuation caused by repeated trial, equipment standby, and manual error can be effectively avoided.

[0041] Further, the step S1 in the embodiment specifically includes:

[0042] The cross-sectional view of the wound cell wound by the separator and the tab with full tabs is obtained by the image capturing device.

[0043] Specifically, the image capturing device is an optical lens device, an ultrasonic imaging device, an X-ray device, or a miniature industrial CT device.

[0044] It should be noted that the cross-sectional view of the wound cell can be directly obtained by the image capturing device. Design personnel can select a suitable type of image capturing device for operation according to the actual situation, and the specific type of the image capturing device is not limited in the embodiment.

[0045] Further, the step S2 in the embodiment specifically includes:

[0046] According to the tab position, size, and number required by the battery specification, a preset number of preset tab positions are marked on the cross-sectional view of the wound cell, and then the cross-sectional view is measured to obtain the distance between every two adjacent preset tab positions in the length direction of the tab.

[0047] It should be noted that since the battery has various specifications and models, the tab position, size, and number in each battery are different. Therefore, in the embodiment, the cross-sectional view of the wound cell is mainly marked with a preset number of preset tab positions according to the above three specific parameters in the battery. In actual situations, the technical personnel can pre-record the specific parameters of the tab position, size, and number in each battery into the computer system, and then select the matching reference system, i.e., the preset number of preset tab positions, for the wound cell according to the battery specification to be produced.

[0048] Further, the number n of the preset tab positions in the embodiment is greater than or equal to 2, and the plurality of preset tab positions are arranged in the length direction of the tab.

[0049] It should be noted that, as shown in Figure 2 , the wound cell structure in Figure 2 has a total of three preset tab positions, i.e., Figure 2n can be 3, and Dn-1 is D2, where D2 is the distance between the third preset tab position J3 and the second preset tab position J2. The distance D2 can be directly obtained by measuring the cross-sectional view. Then, the designer can confirm the distance between the third tab and the second tab on the tab according to the above D2, and cut the tab according to the distance.

[0050] Further, the step S2 in the embodiment further includes:

[0051] The cross-sectional view is measured to obtain the distance between the closest preset tab position to the leading end of the tab and the leading end of the tab, and the distance between the closest preset tab position to the trailing end of the tab and the trailing end of the tab in the length direction of the tab.

[0052] It should be noted that, as Figure 2 shown, Figure 2 there are three preset tab positions in the wound cell structure in the embodiment, i.e. Figure 2 n can be 3, where the first preset tab position J1 is closest to the leading end of the tab, the distance between the first preset tab position and the leading end of the tab is K1, the third preset tab position J3 is closest to the trailing end of the tab, and the distance between the third preset tab position and the trailing end of the tab is K3. The designer can confirm the distance between the first tab and the leading end of the tab and the distance between the last tab and the trailing end of the tab when cutting the tab according to the above K1 and K3.

[0053] Further, in the step S2 of the embodiment, the cross-sectional view is measured by the image size measurement software to obtain the distance between every two adjacent preset tab positions in the length direction of the tab.

[0054] It should be noted that the above image size measurement software is a commonly used measurement software in the prior art, and the embodiment will not be described in detail. The distance between two adjacent preset tab positions on the tab in the wound cell can be directly measured by the above image size measurement software.

[0055] The above is a detailed description of the specific process of the method for quickly determining the tab distance size provided by the embodiment. The above method will be further described based on the above content with an actual example as follows:

[0056] As Figure 3 shown, first, a first tab with full tabs, a second tab with full tabs, and a separator are prepared, and the three are wound to form a wound cell. The separator is located between the first tab and the second tab to separate the two, and the width of the separator is the largest (the Y direction size is the largest).

[0057] Then, in order to match the image capture device used in the embodiment, the diaphragm is intentionally lifted by a distance h during the winding process described above, so that when the cross-sectional image of the wound battery is obtained by the image capture device, the bottom edge of the diaphragm will not affect the image, and a high-quality, clear and complete cross-sectional view image can be obtained.

[0058] Finally, the cross-sectional view of the wound battery is imported into a computer system, and the preset tab position is marked on the cross-sectional view. The image size measurement software is used for measurement, and the distance between the two adjacent preset tab positions on the pole piece in the wound battery can be output.

[0059] Embodiment two

[0060] Referring to Figures 2 to 4 The device for quickly determining the tab distance provided in the embodiment of the application is designed based on the method in embodiment one, and specifically includes:

[0061] An image acquisition module is configured to acquire a cross-sectional view of a wound battery wound by a diaphragm and a pole piece with full tabs;

[0062] An image analysis processing module is configured to mark a preset tab position on the cross-sectional view of the wound battery, and then measure the cross-sectional view to obtain the distance between every two adjacent preset tab positions in the length direction of the pole piece.

[0063] It should be noted that through the above design, the die-cutting size of the pole piece can be accurately and quickly determined, and problems such as material waste, low production efficiency, and large quality fluctuations caused by repeated trial winding, standby equipment, and manual errors can be effectively avoided.

[0064] Embodiment three

[0065] Referring to Figures 2 to 4 The battery production system provided in the embodiment of the application includes a control unit, a die-cutting unit, a winding unit, and the device for quickly determining the tab distance described in embodiment two.

[0066] The die-cutting unit and the device for quickly determining the tab distance are in communication connection with the control unit.

[0067] The die-cutting unit is configured to perform die-cutting processing on the pole piece to form tabs on the pole piece.

[0068] The winding unit is configured to wind the diaphragm and the pole piece with the formed tabs to form a wound battery.

[0069] The control unit is configured to receive a control signal from the device for quickly determining the distance between the tabs, and control the die-cutting unit and the winding unit to operate.

[0070] It should be noted that the specific working principle of the battery production system in the embodiment is as follows: from the content of the first embodiment and the second embodiment, it can be known that the device for quickly determining the distance between the tabs in the embodiment can quickly determine the distance between every two adjacent preset tab positions of the tab in the length direction, thereby determining the die-cutting size of the tab. Then, after the control unit receives the information of the die-cuting size of the tab, the control unit controls the die-cutting unit to perform die-cutting work on the tab to form tabs on the tab, and after the die-cutting process is completed, the control unit controls the winding unit to wind the separator and the tab with the tabs to form a wound battery cell.

[0071] Further, after the production of the current wound battery cell is completed, the wound battery cell can also be sent to the image acquisition module in the device for quickly determining the distance between the tabs. The image acquisition module can acquire a cross-sectional view of the wound battery cell, and then the image analysis processing module can analyze and process the cross-sectional view to determine the tab alignment of the wound battery cell. Through the above operation, the die-cutting size of the tab in the next wound battery cell can be fed back, thereby achieving the purpose of real-time online adjustment.

[0072] The above describes in detail the method, device and battery production system for quickly determining the distance between the tabs. For those skilled in the art, according to the idea of the embodiment of the present application, the specific implementation and application range can be changed. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A method for quickly determining tab pitch size, characterized by, The method comprises the following steps: S1, obtaining a cross-sectional view of a winding cell formed by winding a diaphragm and a tab of a full tab; S2, marking a preset tab position on the cross-sectional view of the winding cell, and then measuring the cross-sectional view to obtain the distance between every two adjacent preset tab positions in the length direction of the tab.

2. The method of quickly determining tab pitch size according to claim 1, wherein, The step S1 specifically comprises: Obtaining a cross-sectional view of a winding cell formed by winding a diaphragm and a tab of a full tab through an image capturing device.

3. The method of quickly determining tab pitch size according to claim 2, wherein, The image capturing device is an optical lens device, an ultrasonic imaging device, an X-ray device or a miniature industrial CT device.

4. The method of quickly determining tab pitch size according to claim 1, wherein, The step S2 specifically comprises: According to the tab position, size and quantity required by the battery specification, a preset quantity of preset tab positions are marked on the cross-sectional view of the winding cell, and then the cross-sectional view is measured to obtain the distance between every two adjacent preset tab positions in the length direction of the tab.

5. The method of quickly determining tab pitch size according to claim 4, wherein, The number n of the preset tab positions is greater than or equal to 2, and a plurality of the preset tab positions are arranged in the length direction of the tab.

6. The method of quickly determining tab pitch size of claim 1, wherein, The step S2 further comprises: The cross-sectional view is measured, and the distance between the first end of the tab and the preset tab position closest to the first end of the tab and the distance between the last end of the tab and the preset tab position closest to the last end of the tab are obtained.

7. The method of quickly determining tab pitch size of claim 1, wherein, In the step S2, the cross-sectional view is measured by image size measurement software to obtain the distance between every two adjacent preset tab positions in the length direction of the tab.

8. An apparatus for quickly determining tab pitch size, comprising: It comprises: An image acquisition module for acquiring a cross-sectional view of a winding cell formed by winding a diaphragm and a tab of a full tab; An image analysis processing module for marking a preset tab position on the cross-sectional view of the winding cell, and then measuring the cross-sectional view to obtain the distance between every two adjacent preset tab positions in the length direction of the tab.

9. A battery production system characterized by comprising: It comprises a control unit, a die-cutting unit, a winding unit and the device for quickly determining the tab spacing size according to claim 8. The die-cutting unit and the device for quickly determining the tab spacing size are both in communication connection with the control unit.

10. The battery production system according to claim 9, characterized by, The die-cutting unit is used for die-cutting processing of the tab to form a tab on the tab; The winding unit is used for winding the diaphragm and the tab after the tab is formed to form a winding cell; The control unit is used for receiving a control signal from the device for quickly determining the tab spacing size and controlling the operation of the die-cutting unit and the winding unit.

Images