Winding machine and battery cell capacity division method

Abstract

The present invention relates to the field of battery technology, and provides a winding machine and a capacity division method for a battery cell, wherein the winding machine includes a positive electrode sheet unwinding wheel and a winding wheel, wherein a positive electrode sheet unwinding end, a transmission section, and a winding end are sequentially formed between the positive electrode sheet unwinding wheel and the winding wheel along the winding direction, and further includes: a thickness gauge, installed at the positive electrode sheet unwinding end, suitable for measuring the surface density of the positive electrode sheet; a first marking device, located downstream of the winding wheel along the winding direction, the first marking device is connected to the thickness gauge, and suitable for forming a capacitance mark corresponding to the surface density on the battery cell. According to the winding machine of the embodiment of the present invention, the capacity division of the battery cell can be achieved during the winding process, thereby shortening the process flow, reducing the production time, reducing the production cost, and improving the accuracy of the capacity division; in addition, it can adapt to different winding machine specifications, thereby better adapting to production, facilitating control, and facilitating automation.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a winding machine and a capacity division method of a battery cell. Background Art

[0002] Lithium-ion secondary batteries have the advantages of high specific energy, high voltage platform, long life, and no pollution, so they are widely used in portable electronic products, hybrid / pure electric vehicles, energy storage power stations and other fields. The consistency of lithium-ion batteries has an important impact on the capacity, performance and safety of the battery pack. For different application scenarios, it is usually necessary to group the single cells, and connect them in series or in parallel so that they can be used together. During the charging and discharging process of the battery pack, if single cells of different capacities are used in groups, some of the single cells may be overcharged and other single cells may be undercharged. Therefore, it is very important to improve the accuracy of the capacity classification of the single cells.

[0003] At present, the traditional method of cell capacity division is as follows: use a capacity division cabinet to collect the capacity of the cell charge and discharge to determine the capacity. However, this capacity division method usually requires more capacity division cabinets, the capacity of the capacity division is greatly affected by temperature, and there are often certain differences between cabinet points, which will have a certain impact on the accuracy of the capacity division data; and the capacity division cabinet occupies a large space, which increases the investment in the factory; in addition, the capacity division process is time-consuming, prolongs the production cycle, increases labor costs, and overall increases the cost of battery production. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a winding machine that shortens the process flow, reduces production time, reduces production costs, and improves the accuracy of volume separation, and can better adapt to production, facilitate control, and easily realize automation.

[0005] The invention also provides a method for dividing the capacity of a battery cell.

[0006] A winding machine according to a first embodiment of the present invention comprises:

[0007] A positive electrode sheet unwinding wheel and a rewinding wheel, wherein a positive electrode sheet unwinding end, a transmission section and a rewinding end are sequentially formed between the positive electrode sheet unwinding wheel and the rewinding wheel along the winding direction;

[0008] A thickness gauge, installed at the unwinding end of the positive electrode sheet, suitable for measuring the surface density of the positive electrode sheet;

[0009] A first marking device is located downstream of the winding wheel along the winding direction, the first marking device is connected to the thickness gauge, and is suitable for forming a capacitance mark corresponding to the surface density on the battery core.

[0010] According to the winding machine of the embodiment of the present invention, the capacity of the battery cell is obtained by measuring the surface density of the positive electrode sheet with a thickness gauge, which can omit the process flow of dividing the capacity of the battery cell by a capacity dividing cabinet in the related art. On the one hand, the capacity of the battery cell can be divided during the winding process, so that the winding process and the capacity dividing process can be carried out simultaneously, thereby shortening the process flow, reducing the production time, and reducing the production cost. On the other hand, it can avoid the problem of inaccurate measurement caused by external factors such as cabinet point and temperature when the battery cell is divided by a capacity dividing cabinet, thereby improving the accuracy of capacity division. In addition, the thickness gauge and the first marking device can also be flexibly and quickly installed on the winding machine without affecting the normal operation of the winding machine, so that it can adapt to different winding machine specifications, and then better adapt to production, facilitate control, and easy to realize automation.

[0011] According to one embodiment of the present invention, it also includes:

[0012] The battery cell placement plate is located downstream of the winding wheel along the winding direction and is suitable for placing battery cells. The first marking device is located above the battery cell placement plate.

[0013] According to one embodiment of the present invention, it also includes:

[0014] The sensing device is connected to the thickness gauge, installed at the unwinding end of the positive electrode sheet, and is located upstream of the thickness gauge along the winding direction, and is suitable for controlling the opening and closing of the thickness gauge.

[0015] According to one embodiment of the present invention, it also includes:

[0016] A control component is connected to the thickness gauge and the first marking device respectively, and is suitable for receiving the surface density signal of the thickness gauge, determining the capacitance of the battery cell based on the surface density signal to form a capacitance signal, and sending the capacitance signal to the first marking device.

[0017] According to one embodiment of the present invention, the control component comprises:

[0018] A controller connected to the thickness gauge and adapted to receive the surface density signal;

[0019] A computing device is connected to the controller and the first marking device respectively, and is suitable for determining the capacitance of the battery cell based on the surface density signal to form a capacitance signal, and sending the capacitance signal to the first marking device.

[0020] According to an embodiment of the present invention, the computing device has a display screen, and the display screen is suitable for displaying the capacitance of the battery cell.

[0021] According to one embodiment of the present invention, it also includes:

[0022] a second marking device, connected to the controller and mounted on the transmission section, adapted to receive the surface density signal and mark the positive electrode sheet to form a surface density mark;

[0023] A signal scanning device is connected to the computing device and installed at the winding end, and is suitable for scanning the surface density mark and transmitting the surface density signal to the computing device.

[0024] The capacity division method of the battery cell according to the second aspect of the present invention is implemented based on the winding machine according to the first aspect of the present invention, and includes the following steps:

[0025] Measuring the surface density of the positive electrode sheet by the thickness gauge;

[0026] The control component receives the surface density signal of the thickness gauge and determines the capacitance of the battery cell based on the surface density signal;

[0027] The first marking device receives a capacitance signal and forms the capacitance mark on the battery cell based on the capacitance signal.

[0028] According to the capacity division method of the battery cell of the embodiment of the present invention, the capacity of the battery cell is obtained by measuring the surface density of the positive electrode sheet by a thickness gauge, which can omit the process flow of using a capacity division cabinet to divide the capacity of the battery cell in the related art. On the one hand, the capacity division of the battery cell can be achieved during the winding process, so that the winding process and the capacity division process can be carried out simultaneously, thereby shortening the process flow, reducing the production time, and reducing the production cost. On the other hand, it can avoid the problem of inaccurate measurement caused by external factors such as cabinet point and temperature when the battery cell is divided by using a capacity division cabinet, thereby improving the accuracy of capacity division. In addition, the thickness gauge and the first marking device can also be flexibly and quickly installed on the winding machine without affecting the normal operation of the winding machine, so that it can adapt to different winding machine specifications, and thus better adapt to production, facilitate control, and facilitate automation.

[0029] According to one embodiment of the present invention, before the step of measuring the surface density of the positive electrode sheet by the thickness gauge, the method further includes:

[0030] The sensing device senses the conductive area of ​​the positive electrode sheet and controls the thickness gauge to start;

[0031] The sensing device senses the non-conductive area of ​​the positive electrode sheet and controls the thickness gauge to be turned off.

[0032] According to one embodiment of the present invention, the step of the control component receiving the surface density signal of the thickness gauge and determining the capacitance of the battery cell based on the surface density signal includes:

[0033] A second marking device receives the surface density signal and marks the surface density signal on the positive electrode sheet to form a surface density mark;

[0034] The signal scanning device scans the surface density mark and transmits the surface density signal to the computing device.

[0035] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a structural schematic diagram of the winding machine provided by the present invention;

[0038] Figure 2 It is a schematic flow chart of the method for dividing the capacity of a battery cell provided by the present invention.

[0039] Reference numerals:

[0040] 1. Positive electrode unwinding wheel; 2. Rewinding wheel; 3. Thickness gauge; 4. First marking device;

[0041] 5. Battery cell placement board; 6. Sensing device; 7. Controller; 8. Calculation device; 9. Second marking device; 10. Signal scanning device; 11. Display; 12. Battery cell. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0045] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0047] The winding machine according to the first embodiment of the present invention will be described below with reference to the accompanying drawings.

[0048] like Figure 1As shown, the winding machine according to the embodiment of the present invention comprises: a positive electrode sheet unwinding wheel 1, a winding wheel 2, a thickness gauge 3 and a first marking device 4. A positive electrode sheet unwinding end, a transmission section and a winding end are sequentially formed between the positive electrode sheet unwinding wheel 1 and the winding wheel 2 along the winding direction; the thickness gauge 3 is installed at the positive electrode sheet unwinding end, and is suitable for measuring the surface density of the positive electrode sheet; the first marking device 4 is located downstream of the winding wheel 2 along the winding direction, and the first marking device 4 is connected to the thickness gauge 3, and is suitable for forming a capacitance mark corresponding to the surface density on the battery cell 12.

[0049] According to the winding machine of the embodiment of the present invention, the capacity of the battery cell 12 is obtained by measuring the surface density of the positive electrode sheet through the thickness gauge 3, which can omit the process flow of using a capacity dividing cabinet to divide the capacity of the battery cell in the related technology. On the one hand, the capacity of the battery cell 12 can be divided during the winding process, so that the winding process and the capacity dividing process can be carried out simultaneously, thereby shortening the process flow, reducing the production time, and reducing the production cost. On the other hand, it can avoid the problem of inaccurate measurement caused by external factors such as cabinet point and temperature when the battery cell is divided by using a capacity dividing cabinet, thereby improving the accuracy of capacity division. In addition, the thickness gauge 3 and the first marking device 4 can also be flexibly and quickly installed on the winding machine without affecting the normal operation of the winding machine, so that it can adapt to different winding machine specifications, and then better adapt to production, facilitate control, and easy to realize automation.

[0050] According to an embodiment of the present invention, the winding direction refers to the direction in which the positive electrode sheet is unwound from the positive electrode sheet unwinding wheel 1 and is wound into the battery cell 12 by the winding wheel 2. The positive electrode sheet unwinding end, the transmission section and the winding end are arranged upstream, midstream and downstream in sequence along the winding direction.

[0051] A positive electrode sheet is wound on the positive electrode sheet unwinding wheel 1, and a plurality of hanging shafts for supporting the positive electrode sheet are arranged between the positive electrode sheet unwinding wheel 1 and the winding wheel 2. The positive electrode sheet is unwound from the positive electrode sheet unwinding wheel 1, passes through the positive electrode sheet unwinding end, the transmission section and the winding end in sequence, and is wound into a battery cell 12 via the winding wheel 2.

[0052] According to an embodiment of the present invention, the connection in the above-mentioned "the first marking device 4 is connected to the thickness gauge 3" includes a direct connection and an indirect connection, that is, the first marking device 4 can be directly connected to the thickness gauge 3, or the first marking device 4 can be indirectly connected to the thickness gauge 3 through a control component.

[0053] According to an embodiment of the present invention, since the capacity of a lithium-ion battery is provided by the active material on the positive electrode sheet, the capacity of the battery cell 12 is related to the size, material composition, content of the main material and gram capacity of the main material of the positive electrode sheet, and the capacity of the battery cell 12 is directly proportional to the surface density, size, content of the main material and gram capacity of the main material of the positive electrode sheet. Therefore, when the physical quantities such as the size of the positive electrode sheet, the content of the main material and the gram capacity of the main material have been determined, the capacity of the battery cell 12 can be further calculated by measuring the surface density of the positive electrode sheet, thereby obtaining the capacitance value of the battery cell 12.

[0054] In one embodiment of the present invention, the thickness gauge 3 is located at the unwinding end of the positive electrode sheet, and the first marking device 4 is located downstream of the winding wheel 2 along the winding direction. After the positive electrode sheet is unwound by the positive electrode sheet unwinding wheel 1, the thickness gauge 3 measures the surface density of the positive electrode sheet, and then the capacity of the battery cell 12 can be calculated based on the surface density of the positive electrode sheet and other known data. After the positive electrode sheet is wound by the winding wheel 2 to form the battery cell 12, the first marking device 4 marks the capacity of the battery cell 12 on the shell of the battery cell 12 to form a capacitance mark, thereby realizing the capacity division of the battery cell 12 during the winding process.

[0055] In one embodiment of the present invention, the thickness gauge 3 may be a radiographic thickness gauge (radiographs include α, β, γ, etc.), which is fixed to the positive electrode sheet unwinding end of the winding machine through a bracket. Of course, the thickness gauge 3 may also be other types of thickness gauges, which are not specifically limited in the present invention, as long as the thickness gauge 3 can measure the surface density of the positive electrode sheet.

[0056] like Figure 1 As shown, according to one embodiment of the present invention, the winding machine further includes:

[0057] The cell placement plate 5 is located downstream of the winding wheel 2 along the winding direction and is suitable for placing the cell 12. The first marking device 4 is located above the cell placement plate 5. In this way, the first marking device 4 is arranged above the wound cell 12, so that the first marking device 4 can mark the wound cell 12. For example, the cell placement plate 5 is located at the rear side of the winding wheel 2, and the first marking device 4 can be a printer, a plotter, etc. Of course, the present invention is not particularly limited here, as long as the first marking device 4 can mark the cell 12.

[0058] like Figure 1 As shown, according to one embodiment of the present invention, the winding machine further includes:

[0059] The sensing device 6 is connected to the thickness gauge 3, installed at the unwinding end of the positive electrode sheet, and is located upstream of the thickness gauge 3 along the winding direction, and is suitable for controlling the opening and closing of the thickness gauge 3. In this way, by controlling the switch of the thickness gauge 3 through the sensing device 6, the surface density of the positive electrode sheet can be measured more accurately, thereby improving the accuracy of the capacity division. For example, the sensing device 6 is located at the front side of the thickness gauge 3, and the positive electrode sheet first passes through the sensing device 6 and then passes through the thickness gauge 3.

[0060] In one embodiment of the present invention, since the positive electrode sheet has a conductive area and a non-conductive area, and the capacity of the battery cell 12 is related to the surface density of the conductive area of ​​the positive electrode sheet, when the sensing device 6 senses the conductive area of ​​the positive electrode sheet, the thickness gauge 3 is turned on and measures the surface density of the conductive area of ​​the positive electrode sheet; when the sensing device 6 senses the non-conductive area of ​​the positive electrode sheet, the thickness gauge 3 is turned off.

[0061] According to one embodiment of the present invention, the winding machine further comprises:

[0062] The control component is connected to the thickness gauge 3 and the first marking device 4 respectively, and is adapted to receive the surface density signal of the thickness gauge 3, determine the capacitance of the battery cell 12 based on the surface density signal to form a capacitance signal, and send the capacitance signal to the first marking device 4. In this way, the capacitance of the battery cell 12 can be calculated by the control component.

[0063] According to an embodiment of the present invention, the thickness gauge 3 transmits the measured surface density of the positive electrode sheet to the control component in the form of a surface density signal, and the control component then calculates the capacitance of the battery cell 12 using the surface density of the positive electrode sheet and other data. The control component sends the capacitance of the battery cell 12 in the form of a capacitance signal to the first marking device 4, and the first marking device 4 marks the capacitance of the battery cell 12 on the shell of the battery cell 12 to form a capacitance mark.

[0064] like Figure 1 As shown, according to one embodiment of the present invention, the control assembly includes: a controller 7 and a computing device 8. The controller 7 is connected to the thickness gauge 3 and is suitable for receiving the surface density signal; the computing device 8 is respectively connected to the controller 7 and the first marking device 4, and is suitable for determining the capacitance of the battery cell 12 based on the surface density signal to form a capacitance signal, and sending the capacitance signal to the first marking device 4. In this way, a modular structure inside the control assembly can be realized, which is convenient for the maintenance and replacement of the control assembly.

[0065] In one embodiment of the present invention, when the computing device 8 receives the surface density signal, the computing device 8 stores data such as the size of the positive electrode sheet, the content of the main material and the gram capacity of the main material, and then through further calculations, the capacitance of the battery cell 12 can be determined.

[0066] like Figure 1As shown, according to one embodiment of the present invention, the computing device 8 has a display screen, and the display screen is suitable for displaying the capacitance of the battery cell 12. In this way, it is convenient for the staff to check and record the capacitance of the battery cell 12. For example, the computing device 8 can be a computer. Of course, the present invention is not particularly limited here, as long as the computing device 8 can determine the capacitance of the battery cell 12.

[0067] like Figure 1 As shown, according to one embodiment of the present invention, the winding machine further includes: a second marking device 9 and a signal scanning device 10. The second marking device 9 is connected to the controller 7, and is suitable for receiving the surface density signal and marking the positive electrode sheet to form a surface density mark; the signal scanning device 10 is connected to the calculation device 8, and is suitable for scanning the surface density mark and transmitting the surface density signal to the calculation device 8. In this way, it is convenient to record the information of the battery cell 12 in the production process, so that the entire winding process of the battery cell 12 can be traced.

[0068] like Figure 1 As shown, according to one embodiment of the present invention, the second marking device 9 is installed at the transmission section, and the signal scanning device 10 is installed at the winding end. In this way, it is easy to assemble.

[0069] According to an embodiment of the present invention, the positive electrode sheet passes through the sensing device 6, the thickness gauge 3, the second marking device 9, and the signal scanning device 10 in sequence, and is finally rolled into the battery cell 12 by the winding wheel 2, and the first marking device 4 then performs capacitance marking on the battery cell 12. After the positive electrode sheet passes through the thickness gauge 3, the thickness gauge 3 transmits the surface density signal to the controller 7, and the controller 7 then transmits the surface density signal to the second marking device 9. The second marking device 9 marks the surface density on the positive electrode sheet to form a surface density mark. When the positive electrode sheet passes through the signal scanning device 10, the signal scanning device 10 scans the surface density mark on the positive electrode sheet to obtain a surface density signal. The signal scanning device 10 transmits the surface density signal to the calculation device 8. The calculation device 8 determines the capacitance of the battery cell 12 based on the surface density signal, and transmits the capacitance of the battery cell 12 to the first marking device 4 in the form of a capacitance signal. Finally, the positive electrode sheet is rolled up to obtain the battery cell 12, and the first marking device 4 marks the battery cell 12 to form a capacitance mark.

[0070] In one embodiment of the present invention, the controller 7 can be connected to the traceability system to achieve traceability of the battery cell 12, and the entire production process information of the battery cell 12 can be gathered in the controller 7, thereby facilitating recording and summarizing the production process information of the battery cell 12.

[0071] like Figure 1As shown, according to one embodiment of the present invention, the thickness gauge 3 is connected to the display 11, and the display 11 is suitable for displaying the surface density of the positive electrode sheet. In this way, it is convenient for the staff to check and record the data of the positive electrode sheet. For example, the staff can timely find the abnormal situation of the positive electrode sheet according to the data on the display 11, and use the controller 7 to automatically remove the abnormal positive electrode sheet data information.

[0072] According to one embodiment of the present invention, the first marking device 4 and the second marking device 9 may be inkjet printers, which have a simple structure, low cost, and are convenient for marking the battery cell 12 and the positive electrode sheet.

[0073] The specific structure and working process of a winding machine according to a specific embodiment of the present invention are described below with reference to the accompanying drawings.

[0074] like Figure 1 As shown, a sensing device 6, a thickness gauge 3, a second marking device 9 and a signal scanning device 10 are sequentially arranged between the positive electrode sheet unwinding wheel 1 and the winding wheel 2. The sensing device 6 and the thickness gauge 3 are located at the unwinding end of the positive electrode sheet and are respectively connected to a display 11, on which operation keys are arranged; the second marking device 9 is located in the transmission section, and the signal scanning device 10 is located at the winding end. A cell placement plate 5 is arranged behind the winding wheel 2, and the first marking device 4 is fixed above the cell placement plate 5 by a bracket.

[0075] The thickness gauge 3 is a radiographic thickness gauge, the second marking device 9 is a pole piece inkjet printer, the first marking device 4 is an inkjet printer, and the signal scanning device 10 is a scanner. The first marking device 4 and the signal scanning device 10 are connected to the computing device 8 respectively.

[0076] The specific working process of the winding machine is described below according to an embodiment of the present invention.

[0077] like Figure 1As shown, the positive electrode sheet is first installed on the positive electrode sheet unwinding wheel 1. The positive electrode sheet passes through the various hanging shafts of the winding machine during normal winding. After the winding process starts, the sensing device 6 senses the conductive area of ​​the positive electrode sheet, the thickness gauge 3 is turned on and measures the surface density of the positive electrode sheet, and the thickness gauge 3 sends the surface density signal to the display 11 and the controller 7 respectively. The operator can detect the abnormal situation of the electrode sheet in time according to the data on the display 11, and the controller 7 can record and collect the surface density data of the positive electrode sheet, and can automatically eliminate the abnormal surface density data. Subsequently, the controller 7 sends the surface density data to the second marking device 9, and the second marking device 9 sprays the code onto the positive electrode sheet. The positive electrode sheet enters the subsequent process along the conveyor belt, and the signal scanning device 10 scans the QR code on the positive electrode sheet, and transmits the surface density data contained in the QR code to the calculation device 8 through the controller 7, so that the calculation device 8 can calculate the amount of dressing for each positive electrode sheet, and further input the design capacity and tolerance into the calculation device 8 through the formula and the gram capacity of the main material. The calculation device 8 can then accurately calculate the capacitance of each battery cell 12, and the calculated capacitance can be directly sprayed onto the corresponding battery cell 12 through the first marking device 4.

[0078] It should be noted that some contents are described in detail in the winding machine provided in the first aspect embodiment, and the contents in all the winding machine embodiments are also applicable to the battery cell capacity division method provided in the second aspect embodiment. In order to avoid repetition, the battery cell capacity division method provided in the second aspect embodiment is not described in detail.

[0079] The following describes a method for dividing the capacity of a battery cell according to an embodiment of the second aspect of the present invention with reference to the accompanying drawings. The method for dividing the capacity of a battery cell is implemented by a winding machine according to an embodiment of the first aspect of the present invention.

[0080] like Figure 2 As shown, the method for dividing the capacity of a battery cell according to an embodiment of the present invention includes the following steps:

[0081] Step 100, measuring the surface density of the positive electrode sheet by a thickness gauge 3;

[0082] Step 200, the control component receives the surface density signal of the thickness gauge 3, and determines the capacitance of the battery cell 12 based on the surface density signal;

[0083] Step 300: The first marking device 4 receives the capacitance signal and forms a capacitance mark on the battery cell 12 based on the capacitance signal.

[0084] According to the capacity division method of the battery cell of the embodiment of the present invention, the capacity of the battery cell 12 is obtained by measuring the surface density of the positive electrode sheet through the thickness gauge 3, which can omit the process flow of using a capacity division cabinet to divide the battery cell in the related art. On the one hand, the capacity division of the battery cell 12 can be achieved during the winding process, so that the winding process and the capacity division process can be carried out simultaneously, thereby shortening the process flow, reducing the production time, and reducing the production cost. On the other hand, it can avoid the problem of inaccurate measurement caused by external factors such as cabinet point and temperature when the battery cell is divided by using a capacity division cabinet, thereby improving the accuracy of capacity division. In addition, the thickness gauge 3 and the first marking device 4 can also be flexibly and quickly installed on the winding machine without affecting the normal operation of the winding machine, so that it can adapt to different winding machine specifications, and thus better adapt to production, facilitate control, and facilitate automation.

[0085] According to one embodiment of the present invention, before the step 100 of measuring the surface density of the positive electrode sheet by the thickness gauge 3, the method further includes:

[0086] The sensing device 6 senses the conductive area of ​​the positive electrode sheet and controls the thickness gauge 3 to turn on;

[0087] The sensing device 6 senses the non-conductive area of ​​the positive electrode sheet and controls the thickness gauge 3 to be turned off.

[0088] According to one embodiment of the present invention, the control component receives the surface density signal of the thickness gauge 3, and the step 200 of determining the capacitance of the battery cell 12 based on the surface density signal includes:

[0089] The second marking device 9 receives the surface density signal and marks the surface density signal on the positive electrode sheet to form a surface density mark;

[0090] The signal scanning device 10 scans the area density mark and transmits the area density signal to the calculation device 8 .

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A winding machine, comprising a positive electrode sheet unwinding wheel and a winding wheel, wherein a positive electrode sheet unwinding end, a transmission section and a winding end are sequentially formed between the positive electrode sheet unwinding wheel and the winding wheel along the winding direction, and the winding wheel is used to wind up the positive electrode sheet into a battery cell, characterized in that: Also includes: A thickness gauge, installed at the unwinding end of the positive electrode sheet, suitable for measuring the surface density of the positive electrode sheet; A first marking device, located downstream of the winding wheel along the winding direction, the first marking device is connected to the thickness gauge and is suitable for forming a capacitance mark corresponding to the surface density on the battery cell to achieve capacitance division; Also includes: a control component, connected to the thickness gauge and the first marking device, respectively, adapted to receive an area density signal from the thickness gauge, determine the capacitance of the battery cell based on the area density signal to form a capacitance signal, and send the capacitance signal to the first marking device; The control component comprises: A controller connected to the thickness gauge and adapted to receive the surface density signal; A computing device is connected to the controller and the first marking device respectively, and is suitable for determining the capacitance of the battery cell based on the surface density signal to form a capacitance signal, and sending the capacitance signal to the first marking device.

2. The winding machine according to claim 1, characterized in that Also includes: The battery cell placement plate is located downstream of the winding wheel along the winding direction and is suitable for placing battery cells. The first marking device is located above the battery cell placement plate.

3. The winding machine according to claim 1, characterized in that Also includes: The sensing device is connected to the thickness gauge, installed at the unwinding end of the positive electrode sheet and located upstream of the thickness gauge along the winding direction, and is suitable for controlling the opening and closing of the thickness gauge.

4. The winding machine according to claim 1, characterized in that The computing device has a display screen, and the display screen is suitable for displaying the capacitance of the battery cell.

5. The winding machine according to claim 1, characterized in that: Also includes: a second marking device, connected to the controller and mounted on the transmission section, adapted to receive the surface density signal and mark the positive electrode sheet to form a surface density mark; A signal scanning device is connected to the computing device and installed at the winding end, and is suitable for scanning the surface density mark and transmitting the surface density signal to the computing device.

6. A method for dividing the capacity of a battery cell of a winding machine according to any one of claims 1 to 5, characterized in that: The steps include: Measuring the surface density of the positive electrode sheet by the thickness gauge; The control component receives the surface density signal of the thickness gauge and determines the capacitance of the battery cell based on the surface density signal; The first marking device receives a capacitance signal and forms the capacitance mark on the battery cell based on the capacitance signal.

7. The method for dividing the capacity of a battery cell according to claim 6, characterized in that: Before the step of measuring the surface density of the positive electrode sheet by the thickness gauge, the method further includes: The sensing device senses the conductive area of ​​the positive electrode sheet and controls the thickness gauge to start; The sensing device senses the non-conductive area of ​​the positive electrode sheet and controls the thickness gauge to be turned off.

8. The method for dividing the capacity of a battery cell according to claim 6, characterized in that: The step of the control component receiving the surface density signal of the thickness gauge and determining the capacitance of the battery cell based on the surface density signal comprises: A second marking device receives the surface density signal and marks the surface density signal on the positive electrode sheet to form a surface density mark; The signal scanning device scans the surface density mark and transmits the surface density signal to the computing device.

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