Pole piece processing device and pole piece processing method

Abstract

The embodiment of the application provides a kind of pole piece processing device and pole piece processing method, pole piece processing device includes: cutting mechanism is provided with cutting position;Traction mechanism;Position information acquisition device is used to detect the position information of adjacent two pole lug of the material belt in the feeding direction;Processor is electrically connected with the cutting mechanism, the traction mechanism and the position information acquisition device respectively, the processor is used to obtain the distance between adjacent two pole lug in the material belt according to the position information, and according to the distance control the traction mechanism moves the material belt, so that the center line of adjacent two pole lug is opposite to the cutting position, controls the cutting mechanism along the center line of adjacent two pole lug and cuts, to obtain pole piece.Adjacent two pole lug between the error can be shared to adjacent two pole piece, to reduce the influence of pole lug error on pole piece size precision, to improve the overall pole piece alignment of bare battery when lamination.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pole piece processing, and in particular to a pole piece processing device and a pole piece processing method. BACKGROUND

[0002] Lithium batteries play an increasingly important role as the energy source of new energy vehicles. With the continuous development of the new energy industry, designers are constantly pursuing the energy density and space utilization of batteries, and the battery cell is moving towards large size. Batteries made by using the pole piece cutting and stacking process have the advantages of low internal resistance, high discharge rate, high capacity and energy density, and convenient thickness control, and therefore are more and more widely used.

[0003] However, in the traditional pole piece cutting machine, the cutting size accuracy of the pole piece is mainly composed of the CCD positioning accuracy and the rotation accuracy of the traction roller. The error existing in the ear-to-ear distance of the material belt cannot be handled, which affects the cutting size accuracy of the pole piece. SUMMARY

[0004] The pole piece processing device and the pole piece processing method provided by the embodiments of the present application can reduce the influence of the ear-to-ear distance error on the cutting size accuracy of the pole piece, thereby improving the size accuracy of the pole piece.

[0005] The pole piece processing device provided by the embodiments of the present application comprises:

[0006] A cutting mechanism is provided with a cutting position, and the cutting mechanism is used to cut the material belt.

[0007] A traction mechanism is capable of moving the material belt towards the cutting mechanism.

[0008] A position information acquisition device is used to detect the position information of the adjacent two ears of the material belt in the feeding direction.

[0009] A processor is electrically connected with the cutting mechanism, the traction mechanism and the position information acquisition device, respectively. The processor is used to acquire the distance between the adjacent two ears in the material belt according to the position information, and control the traction mechanism to move the material belt towards the cutting mechanism according to the distance, so that the center line between the adjacent two ears is opposite to the cutting position, and the cutting mechanism is controlled to cut the material belt along the center line between the adjacent two ears to obtain a pole piece. The center line intersects with the feeding direction.

[0010] In some embodiments, the position information acquisition device comprises two CCD cameras, and the detection fields of view of the two CCD cameras are sequentially arranged along the feeding direction of the material belt.

[0011] In some embodiments, both of the CCD cameras are arranged before the cutting mechanism in the feeding direction of the material strip, and each of the CCD cameras is configured to detect the coordinates of the edge lines of the two adjacent tabs approaching each other or the coordinates of the two edge lines of one tab in the feeding direction.

[0012] In some embodiments, the position information acquisition device comprises a CCD camera arranged before the cutting mechanism in the feeding direction of the material strip, and the CCD camera is configured to detect the coordinates of the edge lines of the two adjacent tabs approaching each other or the coordinates of the two edge lines of one tab in the feeding direction.

[0013] In some embodiments, the traction mechanism comprises a driving member arranged between the cutting mechanism and the position information acquisition device.

[0014] In some embodiments, the position information acquisition device further comprises a light-emitting member arranged above the material strip perpendicular to the feeding direction, and the light-emitting member is configured to emit light towards the material strip to develop the tabs in the material strip.

[0015] Embodiments of the present application also provide a tab processing method, comprising:

[0016] obtaining the distance between the two adjacent tabs in the feeding direction of the material strip;

[0017] controlling the movement of the material strip according to the distance to make the center line between the two adjacent tabs opposite to the cutting position;

[0018] cutting the material strip along the center line between the two adjacent tabs to obtain a tab.

[0019] In some embodiments, the tab has a preset width in the feeding direction.

[0020] The controlling of the movement of the material strip according to the distance to make the center line between the two adjacent tabs opposite to the cutting position comprises:

[0021] respectively obtaining two shoulder width errors of a first tab away from the cutting position among the two adjacent tabs in the material strip;

[0022] controlling the movement of the material strip by a first distance according to the preset width and the two shoulder width errors of the first tab, and the first distance is equal to the sum of the preset width and the two shoulder width errors.

[0023] In some embodiments, the controlling of the movement of the material strip according to the distance to make the center line between the two adjacent tabs opposite to the cutting position further comprises:

[0024] obtaining two shoulder widths and a tab width of a second tab of the two adjacent tabs in the material strip away from the cutting position in a feeding direction of the material strip;

[0025] controlling the material strip to move a second distance according to the two shoulder widths and the tab width of the second tab, the second distance being equal to a sum of the two shoulder widths and the tab width.

[0026] In some embodiments, the obtaining the distance between the two adjacent tabs in the material strip in the feeding direction comprises:

[0027] obtaining coordinates of a line of approach of the two adjacent tabs in the material strip;

[0028] calculating a difference between the coordinates of the line of approach of the two adjacent tabs to obtain the distance between the two adjacent tabs.

[0029] In the tab processing device and the tab processing method provided by the embodiments of the present application, the distance between the two adjacent tabs in the material strip in the feeding direction is measured to determine the dimensional error between the two adjacent tabs, and then the material strip is controlled to move to a center line between the two adjacent tabs opposite the cutting position according to the real-time error, so that the error between the two adjacent tabs is distributed to the two adjacent tabs, thereby reducing the influence of the tab error on the dimensional accuracy of the tabs and improving the overall tab alignment of the bare battery cell when the tabs are stacked. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 A first structure diagram of the material strip provided by the embodiments of the present application.

[0032] Figure 2 A structure diagram of the tab provided by the embodiments of the present application.

[0033] Figure 3 A structure diagram of the arrangement of the tabs in the battery cell provided by the embodiments of the present application.

[0034] Figure 4 A first structure diagram of the tab processing device provided by the embodiments of the present application.

[0035] Figure 5 A second structure diagram of the tab processing device provided by the embodiments of the present application.

[0036] Figure 6A first flowchart of the pole piece processing method provided in the embodiments of the present application.

[0037] Figure 7 A second structural diagram of the material belt provided in the embodiments of the present application.

[0038] Figure 8 A third structural diagram of the material belt provided in the embodiments of the present application.

[0039] Figure 9 A second flowchart of the pole piece processing method provided in the embodiments of the present application.

[0040] Figure 10 A fourth structural diagram of the material belt provided in the embodiments of the present application.

[0041] Figure 11 A fifth structural diagram of the material belt provided in the embodiments of the present application.

[0042] Explanation of reference signs

[0043] 1 - material belt 10 - tab 10a - first tab

[0044] 10b - second tab 12 - pole piece 13 - battery cell

[0045] 2 - pole piece processing device 21 - cutting mechanism 22 - traction mechanism

[0046] 220 - driving member 23 - position information acquisition device 230 - CCD camera

[0047] 232 - light emitting member 24 - processor A1 - first shoulder width

[0048] A2 - second shoulder width B - tab width C - tab pitch

[0049] C1 - tab pitch C2 - tab pitch C3 tab pitch

[0050] C4 - tab pitch SC - standard pitch L1 - first distance

[0051] L2 - second distance X - feeding direction DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0053] Please refer toFigure 1 and Figure 2 , Figure 1 This is a schematic diagram of the first structure of the material strip provided in the embodiments of this application. Figure 2 This is a schematic diagram of the electrode structure provided in an embodiment of this application. This application provides an electrode processing apparatus used in the electrode processing process. It should be noted that the electrode processing apparatus in this embodiment can be applied to the electrode cutting-stacking process, that is, cutting a certain length of strip 1 to form an electrode 12, and then stacking multiple electrodes 12 to form a battery. To facilitate the storage of the strip 1 of a certain length, the strip 1 is usually wound up. During the cutting process of the strip 1, the strip 1 can be placed on a fixed reel, and the strip processing apparatus can stretch the strip 1 to flatten the wound strip 1, then feed it, position it, and then cut it. The strip 1 may include an electrode portion 11 and multiple tabs 10. The electrode portion 11 may be a long strip-shaped structure, and the multiple tabs 10 may be evenly arranged on one side of the electrode portion. After cutting to obtain electrode sheets 12, each electrode sheet 12 has a tab 10 at one end, and the center line of the tab 10 may coincide with the center line of the electrode sheet 12 in the width direction of the electrode sheet. Please refer to... Figure 1 and Figure 2 And see Figure 3 , Figure 3 This is a schematic diagram of the structure of the battery cell provided in the embodiment of this application. Multiple electrode sheets 12 with tabs 10 are then stacked to obtain a battery cell 13. After the battery cell 13 is packaged, a battery is obtained.

[0054] In the existing technology, the dimensional accuracy of electrode cutting mainly consists of CCD positioning accuracy and traction roller rotation accuracy. It cannot handle the error in the spacing between the electrode tabs of the material strip, which affects the dimensional accuracy of the cut electrode.

[0055] To address the aforementioned issues, this application provides an improvement to the electrode processing apparatus, which will be described below from two perspectives: the structural composition of the electrode processing apparatus and the electrode processing method.

[0056] For example, please refer to Figures 1 to 3 And see Figure 4 , Figure 4This is a schematic diagram of a first structure of the electrode processing apparatus provided in an embodiment of this application. The electrode processing apparatus 2 may include a cutting mechanism 21, a traction mechanism 22, a position information acquisition device 23, and a processor 24. The cutting mechanism 21 is provided with a cutting position and is used to cut the material strip 1. The traction mechanism 22 can drive the material strip 1 to move towards the cutting mechanism 21. The position information acquisition device 23 is used to detect the position information of two adjacent tabs 10 of the material strip 1 in the feeding direction X. The processor 24 is electrically connected to the cutting mechanism 21, the traction mechanism 22 and the position information acquisition device 23 respectively. The processor 24 is used to obtain the distance between two adjacent tabs 10 in the material belt 1 according to the position information, and control the traction mechanism 22 to drive the material belt 1 to move towards the cutting mechanism 21 according to the distance, so that the center line between the two adjacent tabs 10 is opposite to the cutting position. The processor 24 controls the cutting mechanism 21 to cut the material belt 1 along the center line between the two adjacent tabs 10 to obtain the electrode sheet 12. The center line intersects the feeding direction X, and more specifically, the center line is perpendicular to the feeding direction X.

[0057] By measuring the distance between two adjacent tabs 10 of the material strip 1 in the feeding direction, the dimensional error between the two adjacent tabs 10 can be determined. Then, based on the dimensional error, the material strip 1 is controlled to move until the center line between the two tabs 10 is opposite to the cutting position. The material strip 1 is then cut along the center line between the two tabs 10. This can distribute the error between the two adjacent tabs 10 to the two adjacent electrode sheets 12, thereby reducing the impact of the tab 10 error on the dimensional accuracy of the electrode sheet 12 and improving the overall electrode alignment of the bare cell during stacking.

[0058] For example, the cutting mechanism 21 may include a cutting section for cutting and a driving section for driving the cutting section. The driving section may be electrically connected to the cutting section, and the cutting section may perform cutting engagement under the drive of the driving section, thereby cutting the material strip 1 to obtain the electrode sheet 12. The cutting mechanism 21 has a cutting position, which can align the position of the positioned material strip 1 with the cutting position, thereby achieving precise cutting of the material strip 1.

[0059] The traction mechanism 22 can drive the material strip 1 towards the cutting mechanism 21. For example, the traction mechanism 22 may include a drive member 220 and traction rollers. Two traction rollers can be positioned opposite each other on the upper and lower sides of the material strip 1, that is, on both sides perpendicular to the large surface direction of the material strip 1. The two traction rollers can flatten the material strip 1, preventing wrinkles. The two traction rollers also rotate in opposite directions to drive the material strip 1 towards the cutting mechanism 21. The drive member 220 is used to drive the rotation of the traction rollers. For example, the drive member 220 may include a motor, such as a servo motor or a stepper motor. Of course, the drive member 220 may also include other components, which will not be described in detail here. In the feeding direction X of the material strip 1, the drive member 220 can be positioned before the cutting mechanism 21.

[0060] Please combine Figure 4 And see Figure 5 , Figure 5 This is a second structural schematic diagram of the electrode processing apparatus provided in this application embodiment. The position information acquisition device 23 is used to detect the position information of two adjacent tabs 10 in the material strip 1. For example, the position information acquisition device 23 can detect the coordinates of the adjacent edges of two adjacent tabs 10 in the material strip 1, and the processor 24 can calculate the distance between the two adjacent tabs 10 based on the aforementioned coordinates. For example, the position information acquisition device 23 may include at least one CCD camera 230. In the feeding direction X of the material strip 1, the CCD camera 230 is positioned before the cutting mechanism 21. For example, in the feeding direction X of the material strip 1, all CCD cameras 230 may be positioned before the drive member 220. When the position information acquisition device 23 includes one CCD camera 230, the CCD camera 230 is used to acquire the coordinates of the adjacent edges of two adjacent tabs and / or the coordinates of two edges of one tab along the feeding direction, thereby enabling time-division acquisition of the position information of two adjacent tabs 10. When the position information acquisition device 23 includes two CCD cameras 230, the detection fields of the two CCD cameras 230 are arranged sequentially along the feeding direction X of the material strip 1. It can be understood that the sequential arrangement of the two detection fields of view can be due to a distance between them, partial overlap, or direct contact. The line connecting the center points of the detection fields of view of the two CCD cameras 230 can be parallel to the feeding direction of the material strip 1 to ensure the accuracy of the detected tab 10 position information. The two CCD cameras 230 are used to detect the coordinates of the adjacent edges of two adjacent tabs 10 in the material strip 1, thereby simultaneously acquiring the position information of two adjacent tabs 10. The CCD camera 230 can also be used to acquire the coordinates of two edges of a tab along the feeding direction, thereby acquiring the position information and width of the tab. Of course, the position information acquisition device 23 can also include other types of position sensors, such as fiber optic sensors. Designers can choose the type of sensor as needed, and should not assume that the sensor can only be a CCD camera.

[0061] In addition, the CCD camera 230 can also acquire the distance between the two sides of a tab 10 along the feeding direction to facilitate the calculation of the width of the tab 10.

[0062] As an example, the position information acquisition device 23 may further include a light-emitting element 232, which is disposed above the material strip 1 perpendicular to the feeding direction X, i.e., on one side of the large surface of the material strip 1. The light-emitting element 232 is used to emit light toward the material strip 1 to develop the tabs 10 in the material strip 1, thereby facilitating the CCD camera 230 to capture the edge lines of the tabs 10. As an example, the light-emitting element 232 can be various types of lamps.

[0063] For example, the processor 24 can be the control center of the electrode processing apparatus 2. The processor 24 is electrically connected to the cutting mechanism 21, the traction mechanism 22, and the position information acquisition device 23 to receive position information of two adjacent tabs 10 in the material strip 1, process the position information to obtain the distance between the two adjacent tabs 10 in the material strip 1, control the traction mechanism 22 to move the material strip 1 according to the distance, so that the center line between the two adjacent tabs 10 is aligned with the cutting position, and finally control the cutting mechanism 21 to cut the material strip 1 along the center line of the two adjacent tabs 10 to obtain the electrode 12. It can be understood that the processor 24 controls the timing of the operation of the traction mechanism 22 and the cutting mechanism 21 according to the obtained distance between the two adjacent tabs 10, thereby achieving precise positioning and cutting of the material strip 1. For example, the processor 24 can be a chip or an integrated circuit, on which control algorithms and logic can be integrated to control the operation of the electrode processing apparatus 2.

[0064] To more clearly explain the principle of error allocation in the embodiments of this application, the following explanation will be given from the perspective of electrode processing method.

[0065] For example, please refer to Figures 1 to 5 And see Figure 6 This application also provides an electrode processing method, including:

[0066] 101. Obtain the distance between two adjacent tabs of the material strip in the feeding direction.

[0067] In actual manufacturing, dimensional errors can easily exist between adjacent tabs 10 in the feeding direction X of the material strip 1. Therefore, the distance between two adjacent tabs 10, for example, denoted as the tab spacing C, is first obtained and compared with the standard spacing SC between two adjacent tabs 10 to determine the dimensional error between them. This dimensional error can then be distributed across two adjacent electrode sheets 12, thereby reducing the impact of the tab 10's dimensional error on the cutting dimensions of the electrode sheets 12 and improving the overall alignment when the electrode sheets 12 are stacked.

[0068] 102. Control the movement of the conveyor belt according to the distance so that the center line between two adjacent tabs is aligned with the cutting position.

[0069] 103. Cut the strip along the center line between two adjacent tabs to obtain the electrode sheet.

[0070] Regarding steps 102 and 103:

[0071] The dimensional error between adjacent tabs 10 can be distributed to adjacent electrode plates 12. The conveyor belt 1 can be moved so that the centerline between two adjacent tabs 10 is aligned with the cutting position, effectively distributing the error between the two tabs 10 evenly across the two adjacent electrode plates 12. For example, when the tab spacing C between two adjacent tabs 10 is equal to the standard spacing SC, cutting is performed along the centerline between the two tabs 10. In this case, the error between the two tabs 10 is 0, and the shoulder widths of the two adjacent tabs 10 are equal, both being C / 2. As another example, when the tab spacing C between two adjacent tabs 10 is equal to the sum of the standard spacing SC and the error D, i.e., C = SC + D, cutting is performed along the centerline between the two adjacent tabs 10. The shoulder widths of the two adjacent tabs 10 are also equal, and these two shoulder widths are (SC + D) / 2 respectively. It should be noted that the shoulder width of the tab 10 is also a part of the width of the electrode 12. Since the tab 10 protrudes from the end of the electrode 12, the length of the edge line on one side of the tab 10 and the edge line of the electrode 12 on the same side of the tab 10 along the feeding direction X of the material belt 1 is also a part of the width of the electrode 12. The size of the electrode 12 along the feeding direction X of the material belt 1 is taken as the width of the electrode 12.

[0072] Please see Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of a second structure of the material strip provided in an embodiment of this application. Figure 8 This is a schematic diagram of a third structure of the strip provided in this application embodiment. For example, when the spacing between any two adjacent tabs fluctuates, assuming the actual values ​​of the tab spacing C between consecutive adjacent tabs 10 are SC, SC+0.3 mm, SC, and SC-0.3 mm respectively, where 0.3 is the error D. In this case, the tab spacing C = SC between two tabs on the electrode 1 and electrode 2 can be obtained through two CCD cameras 230 and processor 24. Processor 24 controls traction mechanism 22 to move the strip 1 by a preset width W of the electrode, so that the center line between two adjacent tabs on the electrode 1 and electrode 2 is located on the straight line where the cutting position is located, thereby obtaining the width W1 of electrode 1 as the preset width W. Similarly, the width W2 of electrode 2 is W+0.15, the width W3 of electrode 3 is W+0.15, and the width W4 of electrode 4 is W-0.15. Therefore, using the positioning and cutting method of this application embodiment, the electrode width accuracy is W+ / -0.15. If the traditional CCD positioning tab is used and the traction mechanism travels a fixed length, the widths of electrode 1 to electrode 4 are W, W+0.3, W, and W-0.3, respectively. At this time, the electrode width accuracy is W+ / -0.3, so the positioning accuracy is higher in this embodiment.

[0073] For example, when the distance between any two adjacent tabs remains constant, assuming the actual values ​​of the tab distance C between consecutive adjacent tabs 10 are SC+0.3 mm, SC+0.3 mm, SC+0.3 mm, and SC+0.3 mm respectively, referring to the above-described method of moving the material strip 1, the shoulder width on both sides of each tab can be SC / 2+0.15 mm respectively. Compared to the traditional positioning method, the shoulder widths on both sides of the tab are SC / 2 and SC / 2+0.3 mm respectively, meaning that the embodiment of this application can further reduce the shoulder width error of the tabs.

[0074] In summary, the electrode processing method of this application embodiment can improve the width accuracy of the sliced ​​electrode when the electrode tab spacing of the strip 1 fluctuates, and can improve the electrode tab shoulder width accuracy when the electrode tab spacing is stable and without fluctuation.

[0075] Please combine Figures 4 to 8 And see Figure 9 , Figure 9 This is a schematic diagram of the second process of the electrode processing method provided in an embodiment of this application. An embodiment of this application also provides an electrode processing method, including:

[0076] 201. Obtain the coordinates of the edges of two adjacent tabs in the material strip that are close to each other.

[0077] 202. Calculate the difference in coordinates of the edges of two adjacent electrodes that are close together, so as to obtain the distance between the two adjacent electrodes.

[0078] Regarding steps 201 and 202:

[0079] The distance between two adjacent tabs 10 along the feed direction X in the feed belt 1 can be obtained by detecting the coordinates of the two tabs 10 near their respective edges. This can be achieved by using two sensors to simultaneously obtain the coordinates of the two tabs 10 near their respective edges, or by using a single sensor to obtain the coordinates of the two tabs 10 near their respective edges in a time-division manner. By calculating the difference between the coordinates of the two adjacent tabs 10 near their respective edges, the distance between the two tabs 10 can be obtained. This difference is then compared with the standard spacing SC to determine the error between the two adjacent tabs 10. The distance the feed belt 1 moves is controlled based on this error.

[0080] 203. Obtain the two shoulder width errors of the first tab, which is furthest from the cutting position, among two adjacent tabs in the strip.

[0081] 204. The material belt is moved a first distance according to the preset width and the two shoulder width errors of the first tab. The first distance is equal to the sum of the preset width and the two shoulder width errors.

[0082] Regarding steps 203 and 204:

[0083] Please see Figure 10 ,Figure 10 This is a schematic diagram of the fourth structure of the material strip provided in the embodiments of this application. The control of the moving distance of the material strip 1 can be divided into two methods: In the first method, it is known that the electrode 12 has a preset width W along the feeding direction X. At this time, it is only necessary to know the two shoulder width errors of the electrode tabs 10 in the electrode 12 to know the distance that the material strip 1 needs to be controlled to move, which is the sum of the preset width W and the two shoulder width errors. Thus, the dimensional error between adjacent electrode tabs 10 can be distributed to the two adjacent electrode sheets 12 to improve the overall dimensional accuracy of the electrode sheet 12.

[0084] For example, the shoulder width errors of the first electrode 10a, which is furthest from the cutting position among two adjacent electrodes 10 in the feed strip 1, such as the first shoulder width error D1 and the second shoulder width error D2. In the feeding direction X, the first shoulder width error D1 can be half the difference between the electrode spacing C1 between the first electrode 10a and the previous electrode along the feeding direction X and the standard spacing SC, that is, D1 = (C1 - SC) / 2. Correspondingly, the second shoulder width error D2 can be half the difference between the electrode spacing C2 between the first electrode 10a and the next electrode along the feeding direction X and the standard spacing SC, that is, D2 = (C2 - SC) / 2. At this time, the state of the feed strip 1 is that the electrode piece 12 where the next electrode of the first electrode 10a is located has been cut from the feed strip 1. The next action is to locate the position of the first electrode 10a and then cut off the electrode piece 12 corresponding to the first electrode 10a.

[0085] Based on the preset width W and the two shoulder width errors D1 and D2 between the first electrode tab 10a and the first electrode tab 10a, the material strip 1 is moved a first distance L1. The first distance L1 is equal to the sum of the preset width W and the two shoulder width errors, that is, L1 = W + D1 + D2 = W + (C1 + C2 - 2SC) / 2. It can be understood that moving the material strip 1 along the feeding direction X by the first distance L1 will make the center line of the first electrode tab 10a and its previous electrode tab align with the cutting position. At this time, cutting the material strip 1 can obtain the electrode sheet 12 with the first electrode tab 10a.

[0086] It should be noted that in this case, there is no need to consider the size error of the first tab 10a itself; it is only necessary to distribute the error between the two tabs 10.

[0087] 205. Obtain the shoulder width and the width of the second electrode ear that is furthest from the cutting position among two adjacent electrode ears in the material strip.

[0088] 206. Control the material belt to move a second distance based on the two shoulder widths and the width of the second electrode ear. The second distance is equal to the sum of the two shoulder widths and the sum of the electrode ear width.

[0089] Regarding steps 205 and 206:

[0090] Please seeFigure 11 , Figure 11 This is a fifth structural schematic diagram of the conveyor belt provided in the embodiments of this application. In the second method, the width of one tab and the two shoulder widths of this tab can be obtained separately, thereby controlling the distance the conveyor belt 1 moves. For example, the two shoulder widths of the second tab 10b, which is furthest from the cutting position among two adjacent tabs 10 in the conveyor belt 1, such as the first shoulder width A1 and the second shoulder width A2, and the tab width B of the second tab 10b, can be obtained. In the feeding direction X, the first shoulder width A1 can be calculated by the tab distance C3 between the second tab 10b and the previous tab, i.e., A1 = C3 / 2. The second shoulder width A2 can be calculated by the tab distance C4 between the second tab 10b and the next tab, i.e., the second shoulder width A2 = C4 / 2. The tab width B can be calculated based on the coordinates of the two opposite edges of the second tab 10b along the feeding direction X. The conveyor belt 1 can be moved a second distance L2 based on the two shoulder widths of the second tab 10b and the tab width B. The second distance L2 is equal to the sum of the two shoulder widths and the tab width B, that is, L2 = A1 + A2 + B = (C3 + C4) / 2 + B. In this case, the error of the tab width B itself can also be taken into account.

[0091] In the electrode processing apparatus 2 and electrode processing method provided in this application embodiment, by measuring the distance between two adjacent tabs 10 of the material strip 1 in the feeding direction, the dimensional error between the two adjacent tabs 10 can be determined. Then, based on the real-time error, the material strip 1 is controlled to move to the center line between the two tabs 10 and the cutting position, so that the error between the two adjacent tabs 10 can be distributed to the two adjacent electrodes 12, thereby reducing the impact of the tab 10 error on the dimensional accuracy of the electrode 12, and improving the overall electrode alignment of the bare cell during stacking.

[0092] The electrode processing apparatus and electrode processing method provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application, and the descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A pole piece processing apparatus characterized by, The application relates to a method for processing a pole piece, comprising the following steps: a cutting mechanism is arranged with a cutting position, and the cutting mechanism is used for cutting a material belt; a traction mechanism is used for moving the material belt towards the cutting mechanism; a position information acquisition device is arranged with a CCD camera, which is used for detecting the coordinates of the edge lines of two adjacent tabs in the material belt and / or the coordinates of the two edge lines of a tab along the feeding direction; a processor is electrically connected with the cutting mechanism, the traction mechanism and the position information acquisition device, the pole piece has a preset width along the feeding direction, the processor is used for acquiring the distance between the two adjacent tabs in the material belt, and two shoulder width errors of a first tab away from the cutting position in the two adjacent tabs in the material belt are respectively acquired, wherein the shoulder width errors are respectively half of the difference between the tab interval of the first tab and the standard interval along the feeding direction X and half of the difference between the tab interval of the first tab and the standard interval along the feeding direction X. The processor controls the traction mechanism to move the material belt to the cutting mechanism by a first distance according to the preset width and the two shoulder width errors of the first tab, so that the center line between the two adjacent tabs is opposite to the cutting position, wherein the first distance is equal to the sum of the preset width and the two shoulder width errors. The processor controls the cutting mechanism to cut the material belt along the center line between the two adjacent tabs, so as to obtain a pole piece; wherein the center line intersects the feeding direction.

2. The pole piece processing apparatus of claim 1, wherein The position information acquisition device comprises two CCD cameras, and the detection fields of the two CCD cameras are sequentially arranged along the feeding direction of the material belt.

3. The pole piece processing apparatus of claim 2, wherein In the feeding direction of the material belt, the two CCD cameras are arranged before the cutting mechanism, and the two CCD cameras are respectively used for detecting the coordinates of the edge lines of the two adjacent tabs in the material belt and / or the coordinates of the two edge lines of a tab along the feeding direction.

4. The pole piece processing apparatus of claim 1, wherein The position information acquisition device comprises one CCD camera, and the CCD camera is arranged before the cutting mechanism in the feeding direction of the material belt, and the CCD camera is used for acquiring the coordinates of the edge lines of the two adjacent tabs and / or the coordinates of the two edge lines of a tab along the feeding direction.

5. The pole piece processing apparatus according to any one of claims 1 to 4, characterized by, The traction mechanism comprises a driving member, and the driving member is arranged between the cutting mechanism and the position information acquisition device.

6. The pole piece processing apparatus according to any one of claims 1 to 4, characterized by The position information acquisition device further comprises a light-emitting member, the light-emitting member is arranged above the material belt perpendicular to the feeding direction, and the light-emitting member is used for emitting light towards the material belt to develop the tabs in the material belt.

7. A method of processing an electrode sheet, characterized by, The application further relates to a pole piece processing method comprising the following steps: acquiring the distance between two adjacent tabs in the material belt along the feeding direction; acquiring two shoulder width errors of a tab away from the cutting position in the two adjacent tabs in the material belt; controlling the material belt to move according to the first distance, so that the center line between the two adjacent tabs is opposite to the cutting position; The material belt is cut along a center line between the two adjacent tabs to obtain a pole piece.

8. The pole piece processing method according to claim 7, characterized by, The pole piece has a preset width in the feeding direction; The moving of the material belt according to the first distance is to make the center line between the two adjacent tabs opposite to the cutting position, which includes: According to the distance and the preset width, two shoulder width errors of a first tab away from the cutting position among the two adjacent tabs in the material belt are obtained respectively; According to the preset width and the two shoulder width errors of the first tab, the material belt is moved by a first distance, and the first distance is equal to the sum of the preset width and the two shoulder width errors.

9. The pole piece processing method according to claim 7 or 8, characterized by, The distance between the two adjacent tabs in the feeding direction of the material belt is obtained, which includes: The coordinates of the edges of the two adjacent tabs in the material belt are obtained; The difference between the coordinates of the edges of the two adjacent tabs is calculated to obtain the distance between the two adjacent tabs.

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