Pole piece manufacturing method, cutting device and rolling and cutting all-in-one machine

Abstract

The pole piece manufacturing method comprises the steps that a material belt is manufactured, the material belt comprises material distribution areas, a material total area and blank areas, the material distribution areas, the material total area and the blank areas extend in the belt conveying direction, the material distribution areas are located on the two sides of the material belt, the material total area is arranged between the material distribution areas, and the blank areas are reserved on the two sides of the material total area; the cutting mechanism is used for cutting the total material area into pole piece material belts, and each pole piece material belt comprises two adjacent material distribution areas and a blank area; at least two cutting mechanisms in one cutting procedure cut the blank area of one pole piece material belt at intervals, and the blank area and the two adjacent material distribution areas form single pole pieces respectively; and the winding mechanism of one winding process winds the single pole piece formed in one cutting process. Compared with the prior art, part of the winding mechanism and other devices between the slitting mechanism and the winding mechanism are reduced, the function loss is reduced, and meanwhile the utilization rate of the material belt can be increased.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and particularly relates to a method for manufacturing a pole piece, a cutting device, and a roll pressing and cutting integrated machine. Background Art

[0002] With the rapid development of lithium batteries, the requirements for the quality and production capacity of lithium battery products are getting higher and higher. During the preparation process, a coating area and an empty foil area are set on a strip of material. The empty foil area is slit by a slitting device to form a number of identical pole piece sub-strips. Then, the empty foil area on each pole piece sub-strip is cut by a corresponding cutting device to form pole tabs, and the pole tabs and the corresponding coating area enclose to form a finished product.

[0003] For the production capacity requirement, the height of the pole tab cutting generally exceeds the width of the empty foil area, which will inevitably form a large amount of waste, resulting in waste of foil material and increased cost.

[0004] Refer to Figure 1 , Chinese Patent CN116053394A discloses a method for manufacturing a pole piece and a method for manufacturing a battery. Three total coating areas and four empty foil areas are formed by leaving a margin on the strip of material, and they are arranged at intervals. During processing, first, a slitting device is arranged in the middle of the three total coating areas to slit the three total coating areas to form two pole piece strips in the middle and two single-sided coated strips at the edges; for the two single-sided coated strips, a cutting device is arranged in the empty foil area of the single-sided coated strip to cut the pole tabs to form two finished products; for the two pole piece strips in the middle, a set of symmetrically arranged cutting devices is provided to cut the pole tabs to form four finished products.

[0005] Although the utilization rate of the strip of material has been improved, obviously, there are the following two problems: Problem 1: There is still a large amount of waste after cutting the single-sided coated strip. Problem 2: The distribution of the cutting units on the single-sided coated strip is not concentrated, which affects the winding efficiency of the finished product and the overall compactness of the device.

[0006] The information disclosed in this background art section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] The technical problem to be solved by the present invention is: how to reduce the waste rate and improve the winding efficiency of the finished product and the structural compactness.

[0008] The present invention solves the above technical problems by the following technical means:

[0009] The present invention claims to protect a method for manufacturing a pole piece, which includes manufacturing a material tape. The material tape includes a material separation area, a total material area, and a blank area that extend along the tape running direction. The material separation areas are located on both sides of the material tape. The total material area is arranged between the material separation areas, and blank areas are reserved on both sides of the total material area;

[0010] A slitting mechanism slits the total material area to form pole piece tape strips. Each pole piece tape strip includes two adjacent material separation areas and a blank area;

[0011] At least two cutting mechanisms in one cutting process perform spaced cutting on the blank area of one pole piece tape strip, respectively forming pole piece single pieces with the two adjacent material separation areas;

[0012] A winding mechanism in one winding process winds the pole piece single pieces formed in one cutting process.

[0013] The present invention mainly realizes three advantages through the reasonable distribution of the material separation area, the total material area, and the blank area on the material tape. After being slit by the slitting mechanism, the formed pole piece tape strips all include two adjacent material separation areas and a blank area; then, in cooperation with at least two cutting mechanisms in one cutting process performing spaced cutting on the blank area of one pole piece tape strip, bidirectional cutting can be achieved for each blank area. Advantage one: The utilization rate of the material tape is high; Advantage two: Compared with the prior art, the formed pole piece single pieces are arranged more compactly in the present invention, which means that on a material tape of the same width, more pole piece single pieces can be cut in the present invention; Advantage three: The winding mechanism in one winding process can wind the pole piece single pieces formed in one cutting process, which also indicates that the two pole piece single pieces formed on one pole piece tape strip can be wound on the same winding mechanism. Therefore, compared with the prior art, a part of the winding mechanism and other devices between the slitting mechanism and the winding mechanism are reduced. While reducing the functional loss, the utilization rate of the material tape can also be increased.

[0014] Preferably, the width of the material separation area is d1, and the width of the total material area is d2, where d2 = 2d1.

[0015] The slitting mechanism slits in the middle of the total material area, dividing one total material area into two material separation areas without waste loss.

[0016] Preferably, the width of the blank area is greater than the cutting height of the cutting mechanism.

[0017] The width of the blank area being greater than the cutting height of the cutting mechanism is used to ensure the yield.

[0018] Preferably, edges are reserved on the material tape at the outer edges of the material separation areas, and the slitting mechanism cuts and removes the edges.

[0019] Edge trimming can prevent the problem of reduced yield caused by the bending of both sides of the material tape.

[0020] The present invention claims to protect a cutting device, which is applied to a method for manufacturing pole pieces. The method includes a slitting mechanism, a cutting mechanism, and a winding mechanism through which a material tape sequentially flows along the tape running direction. The material tape includes a material separation area, a total material area, and a blank area that extend along the tape running direction. The material separation areas are located on both sides of the material tape, the total material area is arranged between the material separation areas, and blank areas are reserved on both sides of the total material area;

[0021] A slitting mechanism is arranged in the middle of the total material area. The cutting direction of the slitting mechanism is the same as the tape running direction. The number of blank areas corresponds to the cutting processes. The cutting processes are arranged in sequence along a first direction, and the first direction is perpendicular to the tape running direction. Along the tape running direction, cutting processes are correspondingly arranged behind the previous cutting process. One set of cutting mechanisms is arranged at each cutting process, and a set of cutting mechanisms is arranged at intervals along the tape running direction. The direction of a set of cutting mechanisms is the same as the first direction. A winding mechanism is arranged at the winding process.

[0022] By providing a cutting device that matches the material tape, a method for manufacturing pole pieces is realized. In fact, the numbers of the total material area and the blank area in the present invention are not fixed. At the same time, the number of single pole pieces produced is also not fixed and can be defined independently according to actual requirements. Therefore, based on the changes in the material tape, the numbers of the slitting mechanism, the cutting mechanism, and the winding mechanism can change accordingly, with high applicability and wide generality.

[0023] Preferably, the cutting edge of the slitting mechanism faces the middle and the edge of the total material area.

[0024] When the slitting mechanism is located at the edge, it can remove the edge. When the slitting mechanism is located in the middle of the total material area, it can divide the total material area into two material separation areas.

[0025] Preferably, the cutting edges of a set of cutting mechanisms are spaced from each other along the tape running direction, and the outer edge of the cutting edge of the cutting tool assembly and the edge of the corresponding material separation area enclose a shape to be cut. The width of the shape to be cut is the cutting height of the cutting mechanism.

[0026] A set of cutting mechanisms are spaced from each other, achieving the maximum degree of cutting of the blank area on the basis of ensuring the product qualification rate and improving the utilization rate of the material tape.

[0027] The present invention claims to protect a roll pressing and cutting integrated machine, which applies a cutting device and includes a roll pressing device and a buffer device. Along the tape running direction, a material tape sequentially flows through the roll pressing device, the buffer device, and the cutting device. Among them, the roll pressing device is configured to adjust the thickness error of the material tape, and the buffer device is configured to adjust the interval time for the material tape to flow through the roll pressing device and the cutting device.

[0028] The setting of the rolling device is mainly to adjust the thickness error of the material belt, so that the size of the material belt entering the cutting device meets the cutting requirements. Then, in cooperation with the buffer device, the interval time for the material belt to flow through the rolling device and the cutting device is adjusted, so that the rhythms of the rolling device and the cutting device are consistent. Compared with the separate processes of rolling and cutting on the market, it not only reduces the costs caused by the repeated winding and unwinding processes, but also ensures the continuous operation of the rolling and cutting integrated machine, reduces the problem of waste due to splicing of the material belt, and improves the yield rate.

[0029] The buffer device includes a first driving component and a buffer roller component. The first driving component is configured to drive the buffer roller component to abut against the material belt to generate a moving action in the first direction.

[0030] The buffer device mainly drives the buffer roller component to abut against the material belt to generate a moving action in the first direction through the first driving component. Any power source that can achieve linear movement on the market can be used as the first driving component, with high replaceability and high applicability.

[0031] Preferably, the rolling device includes an upper roller component, a lower roller component and a second driving component. The material belt is located between the upper roller component and the lower roller component. The second driving component is configured to drive the upper roller component and / or the lower roller component to generate a moving action of moving away from or approaching each other.

[0032] The rolling device adjusts the thickness of the material belt by squeezing the material belt through the separation and approach of the upper roller component and the lower roller component, so as to ensure that the material belt entering the cutting device meets the cutting size.

[0033] Preferably, it further includes an unwinding device and a thickness measuring device. Along the material belt running direction, the material belt sequentially flows through the unwinding device, the rolling device, the thickness measuring device, the buffer device and the cutting device. Among them, the unwinding device is configured to unwind the material belt, and the thickness measuring device is configured to monitor the thickness error of the material belt.

[0034] The unwinding device is used for unwinding the material belt, and common bobbins and shafts on the market can be used. The thickness measuring device is used to measure the thickness of the material belt, mainly to test whether the adjustment error of the rolling device is within the specified range to ensure the consistency of the material belt thickness.

[0035] Preferably, it further includes a recycling device, which is below the cutting edge of the slitting mechanism and the cutting edge of the cutting mechanism.

[0036] The recycling device recycles the waste materials formed by the slitting mechanism and the cutting mechanism.

[0037] Preferably, it further includes a tension device. The tension device is located on both sides of the thickness measuring device and between the unwinding device and the rolling device. The tension device is configured to adjust the tension value of the material belt at the position to be tensioned.

[0038] The tension device is mainly used to adjust the tension value of the material belt at the position to be tensioned, and is not limited to a specific position. The tension device is preferably a tension system, which generally consists of three parts: a tension control device, a tension transmission device, and a tension detection device. Specifically, during implementation, after being detected by the tension detection device, it is regulated by the tension control device, so that the tension transmission device makes corresponding adjustments to the material belt. This is prior art and will not be elaborated further.

[0039] Preferably, it further includes a deviation rectification device, which is located in front of the roll pressing device, in front of the slitting mechanism, and in front of the cutting mechanism along the direction of the material belt running.

[0040] The deviation rectification device is not limited to a specific position. Preferably, it is a deviation rectification system, which generally includes a deviation rectification controller, a deviation rectification inductor, a deviation rectification frame, and a driver. Specifically, during implementation, after being sensed by the deviation rectification inductor, it is regulated by the deviation rectification controller, so that the driver makes corresponding adjustments to the material belt. This is prior art and will not be elaborated further.

[0041] Preferably, it further includes a reversing roller device, which is located at the position where the material belt needs to be reversed. The reversing roller device is configured to adjust the conveying direction of the material belt.

[0042] The reversing roller device is not limited to a specific position. Preferably, it is a passing roller, and the axis of the passing roller is parallel to the width of the material belt. In addition to adjusting the conveying direction of the material belt, the passing roller can also support the material belt. Description of the Drawings

[0043] Figure 1 is a schematic structural diagram of a roll pressing and cutting integrated machine in Embodiment 1 of the present invention;

[0044] Figure 2 is a schematic diagram of a method for manufacturing a pole piece in Embodiment 2 of the present invention;

[0045] Figure 3 is a schematic diagram of the first material belt in Embodiment 2 of the present invention;

[0046] Figure 4 is a schematic diagram of the first pole piece material belt in Embodiment 2 of the present invention;

[0047] Figure 5 is a schematic diagram of a single piece of the first pole piece in Embodiment 2 of the present invention;

[0048] Figure 6 is a schematic diagram of the second material belt in Embodiment 2 of the present invention;

[0049] Figure 7 is a schematic diagram of the second pole piece material belt in Embodiment 2 of the present invention;

[0050] Figure 8 is a schematic diagram of a single piece of the second pole piece in Embodiment 2 of the present invention.

[0051] 10. Slitting mechanism; 11. Cutting mechanism; 12. Rewinding mechanism;

[0052] 20. Upper roll assembly; 21. Lower roll assembly;

[0053] 30. First drive assembly; 31. Buffer roll assembly;

[0054] 4. Unwinding device; 5. Thickness measuring device;

[0055] 61. Third tension system; 62. First tension system; 63. Second tension system;

[0056] 71. First deviation rectification system; 72. Second deviation rectification system; 73. Third deviation rectification system;

[0057] 81. First reversing roll system; 82. Second reversing roll system; 83. Third reversing roll system; 84. Fourth reversing roll system; 85. Fifth reversing roll system; 86. Sixth reversing roll system;

[0058] 911. First material belt; 9111. First total material area; 91111. First sub - material area; 9112. First edge; 9113. First blank area; 91131. First upper tab; 91132. First lower tab;

[0059] 91. First pole piece belt;

[0060] 9. First single pole piece;

[0061] 9a. Second single pole piece; 9111a. Second total material area; 9113a. Second blank area; 91131a. Second tab; Detailed implementation mode

[0062] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0063] Embodiment 1

[0064] Refer to Figure 1, this embodiment claims to protect a roll pressing and cutting integrated machine, which includes a cutting device, a roll pressing device, a buffer device, a unwind device 4, a thickness measuring device 5, a recycling device, a tension device, a deviation rectifying device, and a reversing roller device. Along the material belt running direction, the material belt sequentially flows through the unwind device 4, the roll pressing device, the thickness measuring device 5, the buffer device, and the cutting device. Among them, the unwind device 4 is configured to unwind the material belt, and the thickness measuring device 5 is configured to monitor the thickness error of the material belt. The unwind device can use common cartridges and spindles on the market. The thickness measuring device is used to measure the thickness of the material belt, mainly to test whether the adjustment error of the roll pressing device is within the specified range to ensure the consistency of the material belt thickness.

[0065] Further, the roll pressing device is configured to adjust the thickness error of the material belt. The roll pressing device includes an upper roll assembly 20, a lower roll assembly 21, and a second driving assembly. The material belt is located between the upper roll assembly 20 and the lower roll assembly 21. The second driving assembly is configured to drive the upper roll assembly 20 and / or the lower roll assembly 21 to move away from or close to each other. The roll pressing device adjusts the thickness of the material belt by squeezing the material belt through the separation and approach of the upper roll assembly 20 and the lower roll assembly 21 to ensure that the material belt entering the cutting device meets the cutting size. The setting of the roll pressing device is mainly to adjust the thickness error of the material belt so that the size of the material belt entering the cutting device meets the cutting requirements. Then, in cooperation with the buffer device, the interval time for the material belt to flow through the roll pressing device and the cutting device is adjusted to make the rhythm of the roll pressing device and the cutting device consistent. Compared with the separate processes of roll pressing and cutting on the market, it not only reduces the cost caused by the repeated winding and unwinding processes, but also ensures the continuous operation of the roll pressing and cutting integrated machine, reduces the problem of waste of the material belt due to splicing, and improves the yield.

[0066] Further, the buffer device is used to adjust the interval time for the material belt to flow through the roll pressing device and the cutting device. The buffer device includes a first driving assembly 30 and a buffer roll assembly 31. The first driving assembly 30 is configured to drive the buffer roll assembly 31 to move the material belt along the first direction. The buffer device mainly drives the buffer roll assembly 31 to move the material belt along the first direction by the first driving assembly 30. Any power source that can achieve linear movement on the market can be used as the first driving assembly 30, with high replaceability and high applicability.

[0067] Further, the cutting device includes a slitting mechanism 10, a cutting mechanism 11, and a winding mechanism 12 through which the material belt sequentially flows along the running direction of the material belt. The material belt includes a material separation area, a total material area, and a blank area that extend along the running direction of the material belt. The material separation areas are located on both sides of the material belt, the total material area is arranged between the material separation areas, and blank areas are reserved on both sides of the total material area;

[0068] A slitting mechanism 10 is arranged in the middle of the total material area. The cutting edge of the slitting mechanism 10 faces the middle and the edge of the total material area. Edge cutting can prevent the problem of reduced yield caused by the bending of both sides of the material tape. By slitting in the middle of the total material area, the slitting mechanism 10 divides one total material area into two sub-material areas without waste loss. The cutting direction of the slitting mechanism 10 is the same as the tape running direction. The blank area corresponds to the number of cutting processes and winding processes. The cutting processes and winding processes are arranged in sequence along the first direction, and the first direction is perpendicular to the tape running direction. A set of cutting mechanisms 11 is arranged at the cutting process. The set of cutting mechanisms 11 is arranged at intervals along the tape running direction and is spaced from each other. On the basis of ensuring the yield, the maximum degree of cutting of the blank area is achieved, and the utilization rate of the material tape is improved. A winding mechanism 12 is arranged at the winding process. The cutting edges of the set of cutting mechanisms 11 are spaced from each other along the tape running direction, and the outer edge of the cutting edge of the cutting tool assembly and the edge of the corresponding sub-material area enclose a shape to be cut. The width of the shape to be cut is the cutting height of the cutting mechanism 11.

[0069] The present invention mainly realizes three advantages through the reasonable distribution of the sub-material area, the total material area and the blank area on the material tape. After being slit by the slitting mechanism 10, the formed pole piece tape includes two adjacent sub-material areas and a blank area; then, at least two cutting mechanisms 11 of a cutting process are used to cut the blank area of a pole piece tape at intervals, so that bidirectional cutting can be realized for each blank area. Advantage one: The utilization rate of the material tape is high; Advantage two: Compared with the prior art, the single-piece arrangement of the pole pieces formed by the present invention is more compact, which means that on a material tape of the same width, the present invention can cut out more single pole pieces; Advantage three: The winding mechanism 12 of a winding process can wind the single pole pieces formed by a cutting process, which also means that the two single pole pieces formed on a pole piece tape can be wound on the same winding mechanism 12. Therefore, compared with the prior art, a part of the winding mechanism 12 and other devices between the slitting mechanism 10 and the winding mechanism 12 are reduced, and while reducing the functional loss, the utilization rate of the material tape can also be increased.

[0070] Further, a recycling device is arranged below the cutting edge of the slitting mechanism 10 and below the cutting edge of the cutting mechanism 11. The recycling device is preferably a waste material recycling and dust removal system for recycling the waste materials formed by the slitting mechanism 10 and the cutting mechanism 11.

[0071] Further, the tension device is configured to adjust the tension value of the material belt at the position to be tensioned. The tension device is preferably a tension system, which generally consists of three parts: a tension control device, a tension transmission device, and a tension detection device. Specifically, during implementation, after being detected by the tension detection device, it is regulated by the tension control device, enabling the tension transmission device to perform corresponding adjustments on the material belt. This is prior art and will not be elaborated further. Along the tape running direction, the tension device located between the unwinding device 4 and the roll pressing device is defined as the third tension system 61, and the tension devices located on both sides of the thickness measuring device 5 are respectively defined as the first tension system 62 and the second tension system 63.

[0072] Further, the deviation rectifying device is preferably a deviation rectifying system, which generally includes a deviation rectifying controller, a deviation rectifying inductor, a deviation rectifying frame, and a driver. Specifically, during implementation, after being sensed by the deviation rectifying inductor, it is regulated by the deviation rectifying controller, enabling the driver to perform corresponding position adjustments on the material belt. This is prior art and will not be elaborated further. Along the tape running direction, the deviation rectifying device on the front side of the roll pressing device is defined as the first deviation rectifying system 71, the deviation rectifying device on the front side of the slitting mechanism 10 is defined as the second deviation rectifying system 72, and the deviation rectifying device on the front side of the cutting mechanism 11 is defined as the third deviation rectifying system 73.

[0073] Further, the reversing roller device is preferably a guide roller, and the axis of the guide roller is parallel to the width of the material belt. In addition to adjusting the conveying direction of the material belt, the guide roller can also support the material belt. Along the tape running direction, the positions to be reversed include the front side of the third tension system 61, both sides of the buffer device, the front side of the second deviation rectifying system 72, and both sides of the cutting mechanism 11. The reversing roller device located on the front side of the third tension system 61 is defined as the first reversing roller system 81. Along the tape running direction, the reversing roller devices on both sides of the buffer device are respectively defined as the second reversing roller system 82 and the third reversing roller system 83. The reversing device on the front side of the second deviation rectifying system 72 is defined as the fourth reversing roller system 84. Along the tape running direction, the reversing devices on both sides of the cutting mechanism 11 are respectively defined as the fifth reversing roller system 85 and the sixth reversing roller system 86.

[0074] In actual use, a roll pressing and cutting integrated machine in this embodiment goes through the following stages;

[0075] The first stage, the unwinding stage. The material belt is unwound by the unwinding device 4, rectified by the first deviation rectifying system 71, reversed by the first reversing roller system 81, and then the tension value of the material belt is adjusted by the third tension system 61.

[0076] The second stage, the roll pressing device 2 acts. The second driving assembly drives the upper roll assembly 20 and / or the lower roll assembly 21 to move away from or close to each other to adjust the thickness error of the material belt.

[0077] In the third stage, the thickness measuring device 5 functions. The material belt passes through the first tension system 62 and the second tension system 63 to adjust the tension value of the material belt. The thickness measuring device 5 located between the second tension system 62 and the second tension system 63 monitors the thickness of the material belt.

[0078] In the fourth stage, the buffer device 3 functions. The material belt is reversed by the second reversing roller system 82, and the buffer device 3 is started. The first driving component 30 drives the buffer roller assembly 31 to contact the material belt to generate a moving action along the first direction, adjusting the interval time for the material belt to flow through the rolling device 2 and the cutting device, so that the production beats of the rolling device 2 and the cutting device are consistent. The buffered material belt enters the next stage after being reversed by the third reversing roller system 83 and the fourth reversing roller system 84.

[0079] In the fifth stage, the cutting device functions. The material belt is corrected by the second deviation correction system 72, and forms a pole piece material belt when flowing through the slitting mechanism 10. After the pole piece material belt is reversed by the fifth reversing roller system 85, it is corrected by the third deviation correction system 73. Each pole piece enters a set of cutting mechanisms 11 in a cutting process. The single pole pieces after cutting are reversed by the sixth reversing roller system 86, and the single pole pieces formed in a cutting process are wound by the winding mechanism 12 of a winding process.

[0080] Embodiment 2

[0081] Refer to Figure 2 , this embodiment provides a method for manufacturing a pole piece, applying the cutting device in Embodiment 1, including:

[0082] S1. Manufacturing a material belt. The material belt includes a material separation area, a total material area, and a blank area that extend along the running direction of the belt. The material separation areas are located on both sides of the material belt. Margins are reserved on the material belt at the outer edges of the material separation areas. The total material area is arranged between the material separation areas. Among them, the width of the material separation area is d1, and the width of the total material area is d2, where d2 = 2d 1， Blank areas are reserved on both sides of the total material area, and the width of the blank area is greater than the cutting height of the cutting mechanism 11.

[0083] S2. The slitting mechanism 10 cuts off the edges of the slitting mechanism 10, and slits the total material area to form a pole piece material belt. Each pole piece material belt includes two adjacent material separation areas and a blank area.

[0084] S3. At least two cutting mechanisms 11 in a cutting process perform spaced cutting on the blank area of a pole piece material belt, respectively forming single pole pieces with the two adjacent material separation areas.

[0085] S4. The winding mechanism 12 of a winding process winds the single pole pieces formed in a cutting process.

[0086] Refer to Figures 3 to 5, Further, a specific application scenario of the method for manufacturing a pole piece is provided, which is used for manufacturing a lithium battery pole piece. The material tape is a foil, and the cutting mechanism 11 is preferably a laser cutting system, specifically including:

[0087] Step 1: Manufacture a first material tape 911. First material zones 91111 are respectively arranged on both sides of the first material tape 911. A first edge 9112 is reserved on the first material tape 911 at the outer edge of the first material zones 91111. The width of the first edge 9112 is preferably 2 mm. Two first total material zones 9111 and three first blank zones 9113 are arranged between the first material zones 91111; the first total material zones 9111 and the first blank zones 9113 are arranged at intervals; wherein, the width of the first material zone 91111 is d1, the width of the first total material zone 9111 is d2, d2 = 2d1, the width of the first blank zone 9113 is greater than the cutting height of the cutting mechanism 11, and the width of the first blank zone 9113 is preferably X, X = h + 2 mm, where h is the cutting height of the cutting mechanism 11.

[0088] Step 2: The slitting mechanism 10 slits and removes the first edge 9112, and slits the first total material zone 9111 to form three first pole piece material tapes 91. Each first pole piece material tape 91 includes two adjacent first material zones 91111 and one first blank zone 9113.

[0089] Step 3: At least two cutting mechanisms 11 in one cutting process perform spaced cutting on the first blank zone 9113 of one first pole piece material tape 91 to form two groups of pole ears, namely a first upper pole ear 91131 and a first lower pole ear 91132. The first upper pole ear 91131 and the first material zone 91111 located above form a first single pole piece 9, and the first lower pole ear 91132 and the first material zone 91111 located below form a first single pole piece 9.

[0090] Step 4: The winding mechanism 12 in one winding process winds the first single pole piece 9 formed in one cutting process.

[0091] Further, compare the pole piece manufacturing method of Solution 1 with the pole piece manufacturing method of the present invention in terms of the total area size comparison and utilization rate comparison of the foil required for manufacturing the same number and same size of single pole pieces. Among them, Solution 1 is the pole piece manufacturing method of the prior art.

[0092] First, compare the total area of the foil required by Solution 1 and the present invention.

[0093] Refer to Figures 6 to 8 , and calculate the total area S1 of the foil required by Solution 1.

[0094] Confirm the size of the single piece 9a of the second electrode sheet to be manufactured, the width d2' of the second total material area 9111a, the length L' of the second total material area 9111a, the height h' of the second tab 91131a, the area s' of a single second tab 91131a, and take the number of second tabs 91131a in the single piece 9a of the second electrode sheet within 1m as n' as an example. According to the formula S' = d2' * L' + s' * n', calculate the total area S' of the single piece 9a of the second electrode sheet.

[0095] Confirm the width of the second blank area 9113a for manufacturing the single piece 9a of the second electrode sheet. According to the formula X' = h' + 2mm, where X' is the width of the second blank area 9113a and h' is the height of the second tab 91131a.

[0096] Confirm the total foil area S1 required for manufacturing the single piece 9a of the second electrode sheet. According to the formula S1 = (3 * d2' + 4 * X') * L', where L' is the length of the second total material area 9111a and d2' is the width of the second total material area 9111a.

[0097] Refer to Figures 3 to 5 , calculate the total foil area S2 required for the present invention.

[0098] Confirm the size of the single piece 9 of the first electrode sheet to be manufactured, the width d2 of the first total material area 9111, the length L of the first total material area 9111, the height h of the first tab, the area s of a single first tab, and take the number of first tabs in the single piece of the first electrode sheet within 1m as n as an example. According to the formula S = d2 * L + s * n, calculate the total area S of the single piece 9 of the first electrode sheet.

[0099] Confirm the width of the first blank area 9113 for manufacturing the single piece 9 of the first electrode sheet. According to the formula X = h + 2mm, where X is the width of the first blank area 9113 and h is the height of the first tab. Since the same number and the same size of single pieces of electrode sheets are manufactured as an example, therefore X = X', and h = h'.

[0100] Confirm the total foil area S2 required for manufacturing the single piece 9 of the first electrode sheet. According to the formula S2 = (3 * d2 + 3 * X + 4) * L, where L is the length of the first total material area 9111 and d2 is the width of the first total material area 9111.

[0101] Take the manufacture of the same number and the same size of single pieces of electrode sheets as an example. Therefore, d2 = d2', L = L', h' = h, X = X', S = S', s = s', n' = n. Respectively take d2 as 20mm, 250mm, and 300mm, L as 1000mm, h as 18mm, s as 450mm 2 , n as 30, and calculate the total foil area S2 required for the present invention and the total foil area S required for the first solution respectively to form Table 1.

[0102] Table 1

[0103]

[0104] Secondly, compare the foil utilization rate required by Solution 1 with that of the present invention.

[0105] Calculate the foil utilization rate η' required by Solution 1. According to the formula η' = S' / S1, where S is the total area of a single piece of the second pole piece 9a, and S1 is the total area of the foil required to manufacture a single piece of the second pole piece 9a.

[0106] Calculate the foil utilization rate η required by the present invention. According to the formula η = S / S2, where S is the total area of a single piece of the first pole piece 9, and S2 is the total area of the foil required to manufacture a single piece of the first pole piece 9.

[0107] Take d2 as 20 mm, 250 mm, and 300 mm respectively, L as 1000 mm, h as 18 mm, and s as 450 mm 2 , and n as 30, calculate the foil utilization rate η' required by Solution 1 and the foil utilization rate η, and form Table 2.

[0108] Table 2

[0109]

[0110] It can be seen that when manufacturing single pieces of pole pieces with the same quantity and the same size, the total area of the foil required is less, and the utilization rate of the foil is higher, the waste formed is less, and as the width of the total material area increases, the foil utilization rate is higher.

[0111] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for manufacturing an electrode sheet, characterized in that, It includes manufacturing a material tape. The material tape includes a material separation area, a total material area, and a blank area that extend along the tape running direction. The material separation areas are located on both sides of the material tape. The total material area is arranged between the material separation areas, and blank areas are reserved on both sides of the total material area. The slitting mechanism (10) slits the total material area to form pole piece tapes. Each pole piece tape includes two adjacent material separation areas and a blank area. At least two cutting mechanisms (11) in one cutting process perform spaced cutting on the blank area of one pole piece tape to respectively form pole piece single pieces with the two adjacent material separation areas. The winding mechanism (12) in one winding process winds the pole piece single pieces formed in one cutting process.

2. The method for manufacturing a pole piece according to claim 1, characterized in that The width of the material separation area is d1, and the width of the total material area is d2, where d2 = 2d1.

3. A method for manufacturing a pole piece according to claim 1, characterized in that, The width of the blank area is greater than the cutting height of the cutting mechanism (11).

4. A method for manufacturing an electrode sheet according to claim 1, characterized in that, Edges are reserved on the material tape at the outer edges of the material separation areas, and the slitting mechanism (10) slits and removes the edges.

5. A cutting device, applied to a method for manufacturing a pole piece according to any one of claims 1 to 4, characterized in that It includes a slitting mechanism (10), a cutting mechanism (11), and a winding mechanism (12) that the material tape sequentially passes through along the tape running direction. The material tape includes a material separation area, a total material area, and a blank area that extend along the tape running direction. The material separation areas are located on both sides of the material tape. The total material area is arranged between the material separation areas, and blank areas are reserved on both sides of the total material area. A slitting mechanism (10) is arranged in the middle of the total material area. The cutting direction of the slitting mechanism (10) is the same as the tape running direction. The number of blank areas corresponds to the cutting processes. The cutting processes are arranged in sequence along the first direction. The first direction is perpendicular to the tape running direction. Along the tape running direction, cutting processes are correspondingly arranged at the rear side of the cutting processes. One set of cutting mechanisms (11) is arranged at one cutting process. One set of cutting mechanisms (11) is arranged at intervals along the tape running direction. The direction of one set of cutting mechanisms (11) is the same as the first direction. A winding mechanism (12) is arranged at the winding process.

6. The cutting device according to claim 5, characterized in that, The cutting edge of the slitting mechanism (10) faces the middle and the edges of the total material area.

7. A cutting device according to claim 5, characterized in that, The cutting edges of one set of cutting mechanisms (11) are spaced from each other along the tape running direction, and the outer edge of the cutting blade assembly of the cutting mechanism (11) and the edge of the corresponding material separation area enclose a shape to be cut. The width of the shape to be cut is the cutting height of the cutting mechanism (11).

8. A roll pressing and cutting integrated machine, applying a cutting device according to any one of claims 5 to 7, characterized in that It includes a rolling device and a buffer device. Along the tape running direction, the material tape sequentially passes through the rolling device, the buffer device, and the cutting device. Among them, the rolling device is configured to adjust the thickness error of the material tape, and the buffer device is configured to adjust the interval time for the material tape to pass through the rolling device and the cutting device.

9. The integrated roll pressing and cutting machine according to claim 8, characterized in that, The buffer device includes a first driving component (30) and a buffer roller component (31). The first driving component (30) is configured to drive the buffer roller component (31) to abut against the material tape to generate a moving action along the first direction.

10. A roll pressing and cutting integrated machine according to claim 8, wherein, The rolling device includes an upper roller component (20), a lower roller component (21), and a second driving component. The material tape is located between the upper roller component (20) and the lower roller component (21). The second driving component is configured to drive the upper roller component (20) and / or the lower roller component (21) to generate a moving action of moving away from or approaching each other.

11. A roll pressing and cutting integrated machine according to claim 8, characterized in that, It further includes an unwinding device (4) and a thickness measuring device (5). Along the tape running direction, the material tape sequentially flows through the unwinding device (4), the rolling device, the thickness measuring device (5), the buffer device and the cutting device. Among them, the unwinding device (4) is configured to unwind the material tape, and the thickness measuring device (5) is configured to monitor the thickness error of the material tape.

12. The integrated roller pressing and cutting machine according to claim 8, characterized in that, It further includes a recycling device, which is below the cutting edge of the slitting mechanism (10) and the cutting edge of the cutting mechanism (11) of the recycling device.

13. A roll pressing and cutting integrated machine according to any one of claims 8 to 11, characterized in that, It further includes a tension device, which is located on both sides of the thickness measuring device (5) and between the unwinding device (4) and the rolling device. The tension device is configured to adjust the tension value of the material tape at the position to be tensioned.

14. A roll pressing and cutting integrated machine according to any one of claims 8 to 11, characterized in that, It further includes a deviation rectifying device, which is located on the front side of the rolling device, the front side of the slitting mechanism (10) and the front side of the cutting mechanism (11) along the tape running direction.

15. A roll pressing and cutting integrated machine according to any one of claims 8 to 11, characterized in that, It further includes a reversing roller device, which is located at the position where the material tape is to be reversed. The reversing roller device is configured to adjust the conveying direction of the material tape.

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