Electrode material winding device

Abstract

This specification relates to an embodiment of an electrode material winding apparatus that winds an electrode material by processing an electrode material without electrode tabs in an impregnation area where an electrolyte can be injected, and by winding the electrode material in a manner where electrode tabs are only placed in a specific area outside the impregnation area, thereby winding the electrode material by injecting electrolyte through the impregnation area.

Description

Technical Field

[0001] The embodiments in this specification relate to an electrode material winding apparatus for processing and winding electrode materials into cores. Background Technology

[0002] Unlike primary batteries, rechargeable batteries can be recharged and can be miniaturized and increased in capacity, thus attracting significant research and development in recent years. With the increasing technological development and demand for mobile devices, the demand for rechargeable batteries as an energy source has risen sharply.

[0003] Secondary batteries are classified according to the shape of their casings into coin-shaped batteries, cylindrical batteries, square batteries, and pouch batteries. The electrode assembly installed inside the casing of a secondary battery is a charge-discharge power generation element composed of a stacked structure of positive electrode / separator / negative electrode. Electrode assemblies are broadly classified into: jelly roll type (where a separator membrane is sandwiched between sheet-like positive and negative electrodes coated with active material and then wound up); stacked type (where multiple positive and negative electrodes are sequentially stacked while the separator membrane is sandwiched); and stacked / folded type (where a unit cell of the stacked type is wound with a long separator membrane). Among these, the jelly roll type electrode assembly is widely used due to its ease of manufacture and high energy density per unit weight.

[0004] On the other hand, Korean Patent Publication No. 10-2021-0058892 (published on May 24, 2021) (hereinafter referred to as prior art) discloses a technique for electrode connection of a core-type electrode assembly in which a foil extending from an electrode protrudes towards the upper and lower end faces of a core, thereby electrically connecting the protruding foil to a connecting tab (electrode plate). As described in the prior art, a conventional core is configured as follows: an electrode, processed into a foil extending towards the end face of the core, is wound, and the protruding foil is folded to form an electrode tab, thereby electrically connecting to the connecting tab at the upper end face. Such a structure... Figure 1 exemplified.

[0005] Figure 1 As an example illustrating the shape of the upper surface of a conventional core as described in existing literature, the diagram shows the foil, corresponding to the electrode tabs, protruding and folded. Figure 1 As shown, in conventional cores, the protruding foil is folded, thus covering the upper surface of the core. This structure limits the gaps for electrolyte injection. Therefore, additional processes or equipment are required for electrolyte injection and impregnation, increasing the complexity and cost of secondary battery manufacturing. Furthermore, the difficulty in electrolyte injection and impregnation leads to issues with product performance and quality.

[0006] In other words, the traditional wound core structure presents challenges in electrolyte injection and impregnation, requiring additional processes and equipment, thus increasing production time and costs. Furthermore, it cannot guarantee the performance and quality of rechargeable batteries, thereby limiting their application and applicability in various fields. Summary of the Invention

[0007] Technical issues

[0008] The objective of this invention is to overcome the limitations of the prior art as described above.

[0009] Therefore, this specification aims to provide an embodiment in which electrolyte can be easily injected during the manufacture of a secondary battery.

[0010] In addition, the present invention aims to provide an embodiment in which the impregnation of electrolyte can be achieved without the need for additional processes and equipment for impregnating electrolyte.

[0011] In addition, the present invention provides an embodiment in which the electrode tabs can be accurately configured as the electrode material is wound.

[0012] Meanwhile, the present invention provides an embodiment of flexibly winding electrode material according to the winding state.

[0013] means of solving technical problems

[0014] In order to solve the problems mentioned above, the solution of the embodiments of this specification is to wind the electrode material in such a way that an impregnation area is formed on the end face of the core of the winding electrode material.

[0015] Specifically, the electrode material is processed in a manner in which no electrode tabs are provided in the impregnation area where the electrolyte can be injected, and the electrode material is wound in a manner in which electrode tabs are provided only in specific areas other than the impregnation area.

[0016] That is, the embodiments of this specification solve the above problems by processing the electrode material without placing electrode tabs in the impregnation area where the electrolyte can be injected, and winding the electrode material in a manner that places electrode tabs only in specific areas other than the impregnation area, thereby injecting the electrolyte through the impregnation area.

[0017] Such technical features can be applied to electrode material production processes, electrode material production methods, electrode material winding processes, electrode material winding methods, and secondary battery manufacturing systems, etc. This specification provides an embodiment of an electrode material winding apparatus that uses the above-mentioned technical features as a solution.

[0018] In an embodiment of an electrode material winding apparatus that uses the above-mentioned technical features as a means to solve the problem, the electrode material winding apparatus includes: a processing section that processes the end of the electrode material in such a way that electrode tabs connected to an electrode plate are formed in a predetermined pattern at one or more of the upper and lower ends; a winding section that winds the electrode material into a cylindrical core; a guiding section that contacts the winding surface of the electrode material and applies pressure to the winding surface in such a way that the electrode tabs are positioned in a specific area corresponding to a portion of one or more end faces of the upper and lower surfaces of the core; a detection section that detects the insertion length of the electrode material from the front end of the winding section; and a control section that determines the configuration state of the electrode tabs based on the detection result of the detection section and adjusts the pressure by controlling the position of the guiding section based on the determination result.

[0019] In this embodiment, the electrode material includes: an electrode divided into a positive electrode and a negative electrode; and a separation membrane that separates the positive electrode and the negative electrode.

[0020] In the embodiment, the processing unit processes the end portion by forming the electrode tab at the end portion corresponding to the electrode.

[0021] In the embodiments, the aforementioned pattern is a pattern based on the position of the electrode tabs corresponding to the aforementioned specific region.

[0022] In the embodiments, the aforementioned pattern is a pattern formed by alternating groups of formed electrode tabs and groups of unformed electrode tabs.

[0023] In the embodiment, the processing part makes engravings on the end, so that the electrode tab is formed into the specified pattern.

[0024] In the embodiment, the processing part processes the end in the following manner: the electrode tabs are formed in the specified pattern, and when the electrode material is wound, the arrangement of the electrode tabs forms a specified shape on the end face.

[0025] In the embodiment, the aforementioned specified shape is a shape in which blank areas are formed on both sides of the aforementioned specific area, and fewer than a specified number of the aforementioned electrode tabs are disposed in the aforementioned blank areas.

[0026] In this embodiment, the guide portion includes: a rolling portion that contacts the winding surface to guide the winding of the electrode material; and a driving portion that is controlled by the control portion to move the position of the rolling portion.

[0027] In this embodiment, the control unit determines the configuration status at predetermined intervals to control the position of the guide unit.

[0028] In the embodiment, the control unit adjusts the pressure by maintaining, moving forward or backward the position of the guide unit according to the judgment result.

[0029] In the embodiment, the control unit adjusts the position of the guide portion to increase the pressure by moving it forward toward the winding portion, and adjusts the position of the guide portion to decrease the pressure by moving it backward from the winding portion.

[0030] In the embodiment, the control unit calculates any one of the specification values ​​of the core based on the detection results, compares the specification value with the reference value of the number of winding turns based on the electrode material, and determines whether the correction of the configuration state is required based on the comparison results.

[0031] In the embodiment, when the difference between the above-mentioned specification value and the above-mentioned reference value is less than the first reference, the control unit determines that there is no need to correct the above-mentioned configuration state and maintains the position of the above-mentioned guide.

[0032] In the embodiment, when the difference between the above-mentioned specification value and the above-mentioned reference value is greater than or equal to a first reference, the control unit determines that the above-mentioned configuration state needs to be corrected and moves the position of the above-mentioned guide unit.

[0033] In the embodiment, when the specification value is greater than the reference value, the control unit moves the position of the guide portion toward the winding portion.

[0034] In the embodiment, the control unit determines the forward distance of the guide unit based on the degree to which the specification value is greater than the reference value.

[0035] In the embodiment, when the specification value is less than the reference value, the control unit moves the position of the guide portion backward from the winding portion.

[0036] In the embodiment, the control unit determines the retraction distance of the guide unit based on the degree to which the specification value is less than the reference value.

[0037] In the embodiment, when the difference between the above-mentioned specification value and the above-mentioned reference value is greater than or equal to a second reference, the control unit determines that it is necessary to further correct the above-mentioned specified pattern and changes the settings of the processing unit. The second reference is a reference that exceeds the above-mentioned first reference.

[0038] The embodiments of the electrode material winding device described above are not limited to the above content, and may also include embodiments described in the following detailed description or deduced / derived from the detailed description.

[0039] Invention Effects

[0040] The electrode material winding apparatus of the embodiment processes and winds the electrode material in a manner that forms an impregnation area through which electrolyte can be injected without the provision of electrode tabs, thereby allowing electrolyte injection to be easily performed through the impregnation area.

[0041] This facilitates the injection of electrolyte, thereby improving the impregnation properties of the electrolyte and allowing for the injection and impregnation of the electrolyte without the need for additional processes and equipment for injection and impregnation.

[0042] In addition, electrolyte injection and impregnation can be carried out without additional processes and equipment, which not only simplifies the manufacturing process but also reduces the time and cost required in the manufacturing process.

[0043] Furthermore, the pressure applied to the winding surface is adjusted based on the judgment of the configuration state of the electrode tabs, thereby accurately configuring the electrode tabs and flexibly winding the electrode material according to the winding state.

[0044] This allows for the accurate division of the connection area with the electrode plate and the immersion area for the injected electrolyte, preventing serpentine winding. It not only improves the safety and reliability of core production but also ensures product quality and performance.

[0045] The effects of the above-described electrode material winding apparatus are not limited to these, and may also include the effects described in the following embodiments or those that can be deduced / derived from the embodiments. Attached Figure Description

[0046] Figure 1 This is an example diagram showing the shape of the upper surface of a conventional core.

[0047] Figure 2 This is a structural diagram of the electrode material winding device in an embodiment.

[0048] Figure 3a It is shown Figure 2 Figure a illustrates a specific implementation of the electrode material winding device.

[0049] Figure 3b yes Figure 2 Figure b shows an example of a specific implementation of the electrode material winding device.

[0050] Figure 4 This is an illustrative diagram showing the shape of the core wound by the electrode material winding apparatus of the embodiment.

[0051] Figure 5 This is an illustrative diagram illustrating an electrode material processed by an electrode material winding apparatus according to an embodiment.

[0052] Figure 6This is an illustrative diagram showing a prescribed pattern of electrode material processed by the electrode material winding apparatus of the embodiment.

[0053] Figures 7a to 7d These are illustrative figures a to d illustrating the end face shape of a core wound by the electrode material winding apparatus of the embodiment.

[0054] Figure 8 This is a sequence diagram showing the order in which the position of the guide portion of the electrode material winding apparatus of an embodiment is adjusted. Detailed Implementation

[0055] Hereinafter, with reference to the accompanying drawings, the embodiments disclosed in this specification will be described in detail. Regardless of the numbering of the drawings, the same or similar constituent elements will be given the same reference numerals, and repeated descriptions of them will be omitted. When describing the embodiments disclosed in this specification, if it is determined that a detailed description of the relevant known technology would obscure the essence of the embodiments disclosed in this specification, its detailed description may be omitted.

[0056] In addition, the accompanying drawings are provided to help to easily understand the embodiments disclosed in this specification. The technical ideas disclosed in this specification are not limited to the contents of the drawings, but include all modifications, equivalents and substitutions that fall within the scope of the ideas and techniques of this invention.

[0057] First, refer to Figures 2 to 3b The structure of the electrode material winding device of the embodiment will be described.

[0058] The aforementioned electrode material winding device (hereinafter referred to as the winding device) refers to a device for processing and winding electrode materials to manufacture cores.

[0059] Here, the aforementioned core refers to an assembly that is formed into a cylindrical structure by winding strip-type / plate-type electrode material as an electrode assembly installed inside a secondary battery.

[0060] Such a winding device includes multiple process units that can process and wind electrode materials supplied from the outside through an automated process.

[0061] like Figure 2 As shown, the winding device 100 includes a processing unit 10, a winding unit 20, a guiding unit 30, a detection unit 40, and a control unit 50.

[0062] The aforementioned processing section 10 may be a device that processes the aforementioned electrode material into a shape that can be wound in the aforementioned winding section 20.

[0063] The winding section 20 can be an apparatus for winding the electrode material processed in the processing section 10 to produce a cylindrical core.

[0064] The aforementioned guide portion 30 may be a device that applies pressure to the electrode material wound in the aforementioned winding portion 20 to guide the winding of the electrode material.

[0065] The detection unit 40 may be a device for detecting the length of the electrode material fed from the processing unit 10 into the winding unit 20.

[0066] The control unit 50 may be a device that controls the overall operation of the winding device 100 by controlling the driving of the processing unit 10, the winding unit 20, the guiding unit 30 and the detection unit 40 respectively.

[0067] Thus, the specific implementation of the winding apparatus 100, which includes the processing unit 10, the winding unit 20, the guiding unit 30, the detection unit 40, and the control unit 50 for processing and winding the electrode material M, is as follows: Figure 3a and Figure 3b As shown.

[0068] like Figure 3a As shown, in the winding apparatus 100, the processing unit 10 receives the electrode material M from the external electrode material supply unit UW and processes the electrode material M into a shape that can be wound in the winding unit 20. During the winding unit 20 winding the electrode material M processed by the processing unit 10, the guide unit 30 guides the winding of the electrode material M. When the detection unit 40 detects the insertion length of the electrode material M into the winding unit 20 and transmits it to the control unit 50, the control unit 50 controls the driving of the winding unit 20 and the guide unit 30 according to the insertion length.

[0069] Here, the electrode material supply unit UW can be a winding device that winds the electrode material M into a cylindrical shape and supplies the wound electrode material M to the processing unit 10.

[0070] On the other hand, such as Figure 3b As shown, the winding device 100, which includes the processing unit 10, the winding unit 20, the guide unit 30, the detection unit 40, and the control unit 50, may also include one or more devices or equipment for processing, transporting, arranging, and winding the electrode material, in addition to the processing unit 10, the winding unit 20, the guide unit 30, the detection unit 40, and the control unit 50.

[0071] In this case, such as Figure 3b As shown, multiple rollers for transporting and arranging the electrode material M can be dispersedly arranged.

[0072] like Figure 4As shown, the winding device 100 described above winds the electrode material M to manufacture a core JR.

[0073] In the winding apparatus 100 described above, the processing unit 10 processes the electrode material M by forming electrode tabs T connected to the electrode plate in a predetermined pattern at one or more of the upper and lower ends. The winding unit 20 winds the electrode material M into a cylindrical core JR. The guide unit 30 contacts the winding surface of the electrode material M and applies pressure to the winding surface in such a way that the electrode tabs T are disposed in a specific region SZ corresponding to a portion of one or more end faces of the upper and lower surfaces of the core JR. The detection unit 40 detects the insertion length of the electrode material M from the front end of the winding unit 20. The control unit 50 determines the configuration state of the electrode tabs T based on the detection result of the detection unit 40 and adjusts the pressure by controlling the position of the guide unit 30 based on the determination result, thereby winding the electrode material M into a cylindrical core JR. Figure 4 The aforementioned core JR is shown.

[0074] Below, refer to Figures 4 to 8 Specific embodiments of the winding device 100 described above will be described.

[0075] In the winding apparatus 100 described above, the processing section 10 processes the ends in such a way that electrode tabs T connected to the electrode plate are formed in a predetermined pattern at one or more of the upper and lower ends of the electrode material M.

[0076] That is, the aforementioned processing unit 10 processes one or more of the upper and lower ends of the aforementioned electrode material M, thereby achieving the following: Figure 5 As shown, the electrode tab T can be formed on the end in the prescribed pattern.

[0077] Therefore, when the electrode material M is wound in the winding section 20, as Figure 4 As shown, the electrode tab T, which is formed in the above-described pattern, protrudes toward the end face of the winding core JR.

[0078] The aforementioned processing unit 10 is driven by the control unit 50 and processes the aforementioned end in a manner that forms the aforementioned electrode tab T in a predetermined pattern according to one or more of the upper and lower ends of the aforementioned electrode material M.

[0079] That is, the processing of the electrode material M of the processing unit 10 is controlled by the control unit 50.

[0080] Furthermore, the aforementioned pattern can be changed via the control unit 50.

[0081] like Figure 5As shown, the electrode material M may include electrodes MP and MN divided into a positive electrode MP and a negative electrode MN, and a separation membrane MS separating the positive electrode MP and the negative electrode MN.

[0082] Here, the electrode material M is formed to divide the positive electrode MP, the separation membrane MS, and the negative electrode MN, with the positive electrode MP, the separation membrane MS, and the negative electrode MN each wound in one turn.

[0083] That is, the positive electrode (MP) of the electrode material M is wound once, the separation membrane MS is wound once on the portion where the positive electrode MP is wound, and the negative electrode MS is wound once on the portion where the separation membrane MS is wound.

[0084] The electrode material M is formed to divide the positive electrode MP, the separation membrane MS, and the negative electrode MN in a manner corresponding to the number of turns of the winding core JR.

[0085] That is, the electrode material M is divided into multiple positive electrodes MP, multiple separation membranes MS, and multiple negative electrodes MN.

[0086] The electrode material M is formed into the electrodes MP and MN and the separation membrane MS in the order of being wound in the winding section 20.

[0087] The aforementioned electrode material M forms a negative electrode MN between a positive electrode MP and the next positive electrode MP.

[0088] In addition, the aforementioned electrode material M forms a positive electrode MP between one negative electrode MN and the next negative electrode MN.

[0089] In this case, the electrode material M is formed in the order in which the separation membrane MS is disposed between the positive electrode MP and the negative electrode MN.

[0090] That is, in the electrode material M, the positive electrode MP and the negative electrode MN are arranged alternately, and the separation membrane MS is arranged between the positive electrode MP and the negative electrode MN respectively.

[0091] Therefore, when the electrode material M is wound in the winding section 20, it is wound in the order of positive electrode MP - separation membrane MS - negative electrode MN - separation membrane MS - positive electrode MP.

[0092] On the other hand, in the electrode material M, the lengths of the electrodes MP and MN and the separation membrane MS are different depending on their position (location).

[0093] In this case, as the position corresponding to the initial number of turns of the aforementioned core JR moves closer to the position corresponding to the subsequent number of turns, the lengths of the aforementioned electrodes MP and MN and the aforementioned separation membrane MS will increase.

[0094] In this case, the lengths of the electrodes MP and MN and the separation membrane MS will increase proportionally to the diameter or circumference of the core JR.

[0095] The aforementioned processing unit 10 processes the aforementioned end in such a way that the aforementioned electrode tab T is formed at the end of the portion corresponding to the aforementioned electrodes MP and MN.

[0096] That is, the aforementioned electrode tab T is formed at one or more of the positive electrode MP and the negative electrode MN in the aforementioned electrode material M.

[0097] When the processing unit 10 processes the positive electrode MP by forming the electrode tab T at the end of the positive electrode MP, the upper end of the positive electrode MP can be processed by forming the electrode tab T at the upper end of the positive electrode MP.

[0098] In addition, when the processing unit 10 processes the electrode tab T at the end of the negative electrode MN, the lower end of the negative electrode MN is processed in a manner that forms the electrode tab T at the lower end of the negative electrode MN.

[0099] That is, the electrode tab T is formed at the upper end of the positive electrode MP and at the lower end of the negative electrode MN.

[0100] Therefore, when the electrode material M is wound, the electrode tab T of the positive electrode MP protrudes from the upper end face of the core JR, and the electrode tab T of the negative electrode MN protrudes from the lower end face of the core JR.

[0101] In this case, on the upper end face of the aforementioned core JR, the protruding electrode tab T is connected to the positive electrode plate, and on the lower end face of the aforementioned core JR, the protruding electrode tab T is connected to the negative electrode plate.

[0102] The aforementioned processing unit 10 processes one or more of the upper end of the positive electrode MP and the lower end of the negative electrode MN in such a manner that the electrode tab T is formed at one or more of the upper end of the positive electrode MP and the lower end of the negative electrode MN.

[0103] For ease of explanation, the following description will focus on an example where the processing unit 10 processes the upper end of the positive electrode MP and the electrode tab T is formed at the upper end of the positive electrode MP. The specific implementation of the winding device 100 can be an example where the electrode tab T is formed at the lower end of the negative electrode MN and an example where the electrode tab T is formed at the upper end of the positive electrode MP and the lower end of the negative electrode MN respectively. The following description can be applied to other embodiments with the same or modified forms.

[0104] The aforementioned processing section 10 processes the aforementioned ends in such a manner that the electrode tab T is formed in the aforementioned predetermined pattern at one or more of the upper end of the aforementioned positive electrode MP and the lower end of the aforementioned negative electrode MN.

[0105] The aforementioned pattern may be a pattern set according to the position of the electrode tab T corresponding to the aforementioned specific region SZ.

[0106] That is, the aforementioned pattern can be the pattern at the position where the electrode tab T is disposed in the specific region SZ when the electrode material M is wound.

[0107] Here, as Figure 4 As shown, the specific region SZ, as a part of the end face, is the region corresponding to the area connected to the electrode plate.

[0108] That is, the electrode tab T is disposed in the specific region SZ, thereby enabling it to be connected to the electrode plate in the specific region SZ.

[0109] The aforementioned specific region SZ can be the region corresponding to the area welded to the aforementioned electrode plate.

[0110] That is, the specific region SZ can be formed according to the area welded to the electrode plate.

[0111] The aforementioned specific region SZ can be formed in multiple ways on the aforementioned end face.

[0112] In this case, such as Figure 4 As shown, the aforementioned specific regions SZ are formed at four points in the cross direction.

[0113] On the other hand, in the aforementioned specific region SZ, the aforementioned electrode tabs T can be folded in the same direction.

[0114] That is, the electrode tabs T disposed in the aforementioned specific region SZ can be folded in the same direction to form the aforementioned specific region SZ.

[0115] Preferably, the electrode tab T is folded toward the center of the core JR, thereby overlapping a portion with the electrode tabs disposed at the front and back.

[0116] Thus, the aforementioned specific region SZ is formed in a shape where the aforementioned electrode tab T is folded, causing a portion of the adjacent electrode tabs to be stacked.

[0117] like Figure 6 As shown, the aforementioned pattern can be a pattern formed by alternating groups of forming groups TP that form one or more of the aforementioned electrode tabs T and groups of not forming groups EP that do not form the aforementioned electrode tabs T.

[0118] Here, the aforementioned pattern may include multiple of the aforementioned forming groups TP and the aforementioned non-forming groups EP.

[0119] That is, the above-mentioned pattern can be formed into multiple of the above-mentioned forming groups TP, and the above-mentioned unformed group EP is formed between the above-mentioned forming groups TP.

[0120] Therefore, the aforementioned pattern can be formed into a shape having a distance or more between the aforementioned forming groups TP.

[0121] Here, the aforementioned forming group TP is formed at the position corresponding to the aforementioned specific region SZ, and the aforementioned unformed group EP is formed at the position corresponding to the blank region NZ outside the aforementioned specific region SZ.

[0122] Therefore, when the electrode material M is wound, the forming group TP forms the specific region SZ on the end face, and the unforming group EP forms the blank region NZ on the end face.

[0123] On the other hand, in the above-mentioned pattern, the position and number of the electrode tabs T, and the interval between the forming groups TP are different depending on the position (location) of the electrode material T.

[0124] In this case, as the position corresponding to the initial number of turns of the aforementioned core JR moves closer to the position corresponding to the subsequent number of turns, the number of electrode tabs T formed and / or the interval between the aforementioned forming groups TP will increase.

[0125] In this case, the number of electrode tabs T formed and / or the spacing between the forming groups TP increase proportionally to the diameter or circumferential length of the core JR.

[0126] The aforementioned processing section 10 makes engravings on the aforementioned end, so that the aforementioned electrode tab T is formed into the aforementioned specified pattern.

[0127] That is, the aforementioned processing section 10 processes the aforementioned end marks in such a way that the aforementioned electrode tab T is formed into the aforementioned predetermined pattern.

[0128] The aforementioned processing section 10 processes the aforementioned end in the following manner: the aforementioned electrode tab T is formed into the aforementioned predetermined pattern, and when the aforementioned electrode material M is wound, the arrangement of the aforementioned electrode tab T forms a predetermined shape on the aforementioned end face.

[0129] Therefore, when the electrode material M is wound in the winding section 20, as Figure 4 As shown, the electrode tab T, which is formed in the above-described pattern, protrudes toward the end face and forms a defined shape.

[0130] The aforementioned shape may be a shape in which the aforementioned blank area NZ is formed on both sides of the aforementioned specific area SZ, and the aforementioned blank area NZ is provided with a number of the aforementioned electrode tabs T less than a specified number.

[0131] Here, the aforementioned blank area SZ can be any area that is different from the aforementioned specific area SZ, and has fewer than the aforementioned specified number of electrode tabs T.

[0132] The aforementioned specified shape refers to the shape formed on the end face JRF of the aforementioned core JR according to the aforementioned specified pattern, such as... Figure 7a As shown, it is a shape in which multiple specific regions SZ are formed and blank regions NZ are formed on both sides of the specific regions SZ.

[0133] In this case, the aforementioned defined shape is formed by dividing the aforementioned specific region SZ and the aforementioned blank region NZ into a fan shape. The division of the aforementioned specific region SZ and the aforementioned blank region NZ is visible through the aforementioned electrode tab T protruding from the aforementioned specific region SZ.

[0134] On the other hand, the aforementioned shape can also be formed as... Figure 7a The examples shown are different from the examples shown in this case, such as Figure 7b As shown, the aforementioned specific region SZ and the aforementioned blank region NZ are each formed into 3, or as follows: Figure 7c As shown, the four specific regions SZ form a cross, and the blank regions NZ are formed between the four specific regions SZ, or as shown in the diagram. Figure 7d As shown, the aforementioned specific region SZ and the aforementioned blank region NZ are each formed as two.

[0135] Thus, when the electrode tab T is formed in the specified pattern at the end and the specified shape is formed on the end face JRF in the form of dividing the specific region SZ and the blank region NZ, the electrode plate is welded to the specific region SZ and electrically connected to the electrode tab T, and electrolyte is injected through the blank region NZ.

[0136] In the winding apparatus 100, the winding section 20 winds the electrode material M, which is formed with the electrode tab T in the prescribed pattern, into a cylindrical core JR.

[0137] The aforementioned winding section 20 is composed of a hollow cylindrical rotating body. When the electrode material M is inserted, it rotates in the direction in which the electrode material M is inserted and winds the electrode material M around its circumference.

[0138] The aforementioned winding section 20 winds the aforementioned electrode material M in turns.

[0139] In this case, the electrode material M is wound in one turn.

[0140] In addition, the aforementioned winding section 20 winds the electrode material M in units comprising multiple turns.

[0141] In this case, the electrode material M is wound in sets of four turns each, by winding the positive electrode MP, the separation membrane MS, the negative electrode MN, and the separation membrane MS in one winding.

[0142] The winding section 20 is driven by the control section 50 to wind the electrode material M into the core JR.

[0143] That is, the winding of the electrode material M of the winding section 20 can be controlled by the control unit 50.

[0144] In this case, the winding portion 20 receives pressure from the guide portion 30 and winds the electrode material M.

[0145] In the winding device 100, the guide portion 30 contacts the winding surface of the electrode material M and applies pressure to the winding surface, so that the electrode tab T is disposed in the specific region SZ.

[0146] The aforementioned guide portion 30 includes: a rolling portion 31, which contacts the aforementioned winding surface to guide the winding of the aforementioned electrode material M; and a drive portion 32, which is controlled by the aforementioned control portion 50 to move the position of the aforementioned rolling portion 31.

[0147] The aforementioned rolling part 31 is made of a cylindrical structure of elastic material and is in contact with the aforementioned winding surface.

[0148] The rolling part 31 contacts the winding surface and applies pressure to the winding surface during the winding of the electrode material M to maintain the elasticity of the electrode material M.

[0149] Thus, the rolling part 31 applies pressure to the winding surface to guide the winding of the electrode material M, so that the electrode material M is wound flatly onto the winding part 20.

[0150] The aforementioned rolling part 31 is composed of a cylindrical rotating body that rotates together with the winding part 20 to wind the electrode material M and applies pressure to the winding surface.

[0151] In this case, the rolling part 31 is driven by the control part 50, thereby guiding the winding of the electrode material M.

[0152] That is, the rotation of the rolling part 31 is controlled by the control unit 50.

[0153] In addition, when the winding part 20 rotates to wind the electrode material M, the rolling part 31 rotates by friction with the winding surface and applies pressure to the winding surface.

[0154] As the diameter of the core JR increases, the rolling section 31 moves further back from the winding section 20, thereby changing the pressure applied to the winding surface.

[0155] As the diameter of the core JR increases, the distance between the winding portion 20 and the rolling portion 31 decreases. When the pressure applied to the winding surface increases, the electrode material M may not be able to be wound accurately due to the increased pressure. Therefore, as the diameter of the core JR increases, the rolling portion 31 moves further back from the winding portion 20, thereby adjusting the pressure applied to the winding surface.

[0156] In this case, the rolling part 31 retracts from the winding part 20 due to the force pushed out from the winding surface through contact with the winding surface.

[0157] Furthermore, the aforementioned rolling section 31 changes position via the aforementioned driving section 32.

[0158] The drive unit 32 may be a servo motor provided on either side of the roll unit 31 in a manner that is combined with the roll unit 31.

[0159] The aforementioned drive unit 32 is driven in any axial direction, causing the position of the aforementioned roll unit 31 to move in the aforementioned axial direction.

[0160] In this case, the rolling part 31 is driven in the direction of the winding part 20 to move its position in the direction of the winding part 20, or it is driven in the opposite direction of the winding part 20 to move its position in the opposite direction of the winding part 20.

[0161] The drive unit 32 is driven by the control unit 50, thereby moving the position of the rolling unit 31.

[0162] That is, the position movement of the rolling part 31 of the drive unit 32 can be controlled by the control unit 50.

[0163] Thus, by moving the position of the rolling part 31, the pressure applied to the winding surface by the drive part 32 is changed, and the guide part 30 adjusts the pressure applied to the winding surface, so that the electrode tab T is disposed in the specific region SZ.

[0164] In this case, when it is necessary to increase the pressure applied to the winding surface, the drive unit 32 is driven to bring the position of the rolling part 31 closer to the winding part 20, thereby increasing the pressure applied to the winding surface. When it is necessary to reduce the pressure applied to the winding surface, the drive unit 32 is driven to move the position of the rolling part 31 away from the winding part 20, thereby reducing the pressure applied to the winding surface.

[0165] In the winding device 100 described above, the detection unit 40 may be an encoder that detects the insertion length inserted from the front end of the winding unit 20.

[0166] The detection unit 40 is driven by the control unit 50 to detect the insertion length.

[0167] The detection unit 40 detects the insertion length of the electrode material M from the processing unit 10 to the winding unit 20 and transmits the detection result to the control unit 50.

[0168] Therefore, the control unit 50 calculates the total length (total amount) of the electrode material M that is fed into the winding unit 20 based on the detection results, and determines the configuration state based on the calculation results.

[0169] In the winding apparatus 100, the control unit 50 determines the configuration state on the end face JRF based on the detection result of the detection unit 40, and adjusts the pressure applied to the winding surface by controlling the position of the guide unit 30 based on the determination result.

[0170] In this case, if it is determined that the above configuration state needs to be corrected, the position of the guide 30 is moved to change the pressure applied to the winding surface.

[0171] The control unit 50 determines the configuration status at predetermined intervals to control the position of the guide unit 30.

[0172] The aforementioned predetermined period, serving as the determination period for the aforementioned configuration state in the aforementioned control unit 50, may be based on the period of the turns or winding units of the aforementioned winding unit 20.

[0173] In this case, when the winding portion 20 winds the electrode material M in sets of 4 turns, the specified period can be set to 1 turn or 1 set.

[0174] When the specified period is set to 1 turn, the control unit 50 determines the configuration state and controls the position of the guide 30 every time the winding unit 20 winds one turn. When the specified period is set to 4 turns, the control unit 50 determines the configuration state and controls the position of the guide 30 every time the winding unit 20 winds 4 turns.

[0175] Therefore, the control unit 50 adjusts the pressure at the specified intervals.

[0176] The aforementioned period can also be set to any number of revolutions.

[0177] In this case, it can be set to 10 turns, and the control unit 50 determines the configuration state and controls the position of the guide 30 every 10 turns of the winding part 20.

[0178] On the other hand, the aforementioned period can be set to different periods depending on the time or the aforementioned length of investment.

[0179] In this case, the initial winding of the electrode material M is set to period A, and the subsequent winding of the electrode material M is set to period B, which is smaller than A.

[0180] In this case, compared with the initial winding when the diameter of the core JR is small, the cycle of the control unit 50 determining the configuration state and the position control of the guide unit 30 during subsequent windings becomes shorter.

[0181] Therefore, during subsequent windings where the diameter of the aforementioned core JR increases, making the winding of the aforementioned electrode material M more difficult, the number of pressure adjustments increases, thereby enabling accurate and stable winding.

[0182] The aforementioned cycle can be set arbitrarily by the user and can also be changed during the operation of the winding device 100.

[0183] Thus, based on the result of judging the above configuration state, the control unit 50, which controls the position of the guide 30, maintains, moves forward or backward on the position of the guide 30 according to the above judgment result, thereby adjusting the pressure.

[0184] That is, the control unit 50 can maintain, move forward or backward the position of the guide unit 30 according to whether the above configuration state requires correction, thereby adjusting the pressure.

[0185] In this case, the control unit 50 determines whether the configuration state needs correction every specified period, and maintains, moves forward or backward the position of the guide unit 30 every specified period, thereby adjusting the pressure.

[0186] The control unit 50 moves the position of the guide 30 toward the winding section 20 to increase the pressure, and moves the position of the guide 30 backward from the winding section 20 to decrease the pressure.

[0187] That is, when it is determined that the above configuration state needs to be corrected, the control unit 50 moves the position of the guide 30 toward the winding part 20 to increase the pressure, or moves the position of the guide 30 backward from the winding part 20 to decrease the pressure.

[0188] The control unit 50 calculates any one of the specification values ​​of the core JR based on the detection results, compares the specification value with the reference value based on the number of winding turns of the electrode material M, and determines the configuration state based on the comparison results.

[0189] In addition, the control unit 50 calculates the specification value based on the detection results, compares the specification value with the reference value based on the number of turns of the electrode material M, and determines whether the correction of the configuration state is required based on the comparison results.

[0190] Here, the control unit 50 can determine whether the electrode tab T is disposed in the specific region SZ based on the comparison result.

[0191] That is, the control unit 50 compares the specification value and the reference value, and determines whether to wind the electrode tab T into the specific region SZ based on the difference between the specification value and the reference value.

[0192] The above specification values ​​can be any of the specifications of the above-mentioned core JR.

[0193] The aforementioned specifications may include, for example, one or more of the following: diameter, circumference length, end face width, circumferential surface width, and weight of the aforementioned core JR.

[0194] The aforementioned reference value can be a value set (or stored) in tabular form based on the aforementioned specification value of the aforementioned number of winding turns.

[0195] In this case, if the above reference value is the reference value for the circumference length of the above core JR, then 1 turn can be set as a[mm], 2 turns as b[mm], and n turns as n[mm].

[0196] The above-mentioned specifications are preferably the diameter or radius of the above-mentioned core JR.

[0197] In this case, the aforementioned reference value can be the reference diameter or radius of the aforementioned core JR based on the aforementioned number of winding turns.

[0198] That is, the control unit 50 determines the configuration state based on the diameter or radius of the core JR.

[0199] In this case, if the calculated diameter (specification value) is consistent with the reference diameter, it is determined that the electrode material M is wound according to the reference, and thus the electrode tab T is wound in the specific region SZ according to the reference. If the calculated diameter (specification value) is inconsistent with the reference diameter, it is determined that the electrode material M is not wound according to the reference, and the electrode tab T is not wound in the specific region SZ according to the reference.

[0200] The control unit 50 calculates the total length (total amount) of the electrode material M that is fed into the winding unit 20 based on the detection results, and calculates the specification value based on the calculated results and the current number of winding turns.

[0201] In this case, the above specification value can be calculated based on the above input length relative to the above current number of winding turns.

[0202] Thus, the control unit 50 calculates the specification value based on the calculated result and the current number of winding turns, determines whether the configuration state needs correction based on the comparison result between the specification value and the reference value, and controls the position of the guide unit 30 based on the determination result.

[0203] If the difference between the above-mentioned specification value and the above-mentioned reference value is less than the first reference, the control unit 50 determines that it is not necessary to correct the above-mentioned configuration state, thereby maintaining the position of the guide unit 30.

[0204] Here, the difference between the above specification value and the above benchmark value represents the absolute value.

[0205] That is, if the absolute value of the difference between the above-mentioned specification value and the above-mentioned reference value is less than the first reference, the control unit 50 determines that the electrode material M is wound according to the reference and the electrode tab T is arranged in the above-mentioned specific region SZ according to the reference, and thus determines that the above-mentioned arrangement state does not need to be corrected.

[0206] Therefore, the control unit 50 determines that there is no need to correct the configuration state and adjust the pressure, thereby maintaining the position of the guide unit 30.

[0207] If the difference between the above-mentioned specification value and the above-mentioned reference value is greater than or equal to the first reference, the control unit 50 determines that the above-mentioned configuration state needs to be corrected, and thereby moves the position of the guide unit 30.

[0208] That is, if the absolute value of the difference between the above-mentioned specification value and the above-mentioned reference value is greater than or equal to the first reference value, the control unit 50 determines that the electrode material M is not wound according to the reference value and the electrode tab T is not positioned in the above-mentioned specific region SZ according to the reference value, and thus determines that the configuration state needs to be corrected.

[0209] Therefore, when it is determined that the above configuration state needs to be corrected and the above pressure needs to be adjusted, the control unit 50 moves the position of the guide unit 30 forward or backward.

[0210] At this time, when the above specification value is greater than the above reference value, the control unit 50 causes the position of the guide 30 to move towards the winding unit 20.

[0211] That is, when the specified value is greater than or equal to the first reference value, the control unit 50 determines that the pressure is less than the appropriate pressure for the current number of winding turns, the electrode material M is loosely wound, the specified value becomes greater than the reference value, and the configuration state needs to be corrected, so that the position of the guide 30 moves toward the winding unit 20 and is adjusted to increase the pressure applied to the winding surface.

[0212] Therefore, the control unit 50 determines that the configuration state needs to be corrected and the pressure needs to be adjusted. If the specified value is greater than the reference value, the position of the guide 30 is moved towards the winding part 20 to increase the pressure.

[0213] In this case, the control unit 50 determines the forward distance of the guide unit 30 based on how much the specification value is greater than the reference value.

[0214] That is, the control unit 50 adjusts the degree of pressure increase by changing the forward distance of the guide unit 30 according to the degree of difference between the specification value and the reference value.

[0215] In this case, if the difference between the above-mentioned specification value and the above-mentioned reference value is A, the forward distance of the above-mentioned guide 30 can be determined as X, and the pressure is increased by a. If the difference between the above-mentioned specification value and the above-mentioned reference value is greater than A by B, the forward distance of the above-mentioned guide 30 can be determined as Y, which is greater than X, and the pressure is increased by b, which is greater than a.

[0216] Furthermore, when the aforementioned specification value is less than the aforementioned reference value, the aforementioned control unit 50 causes the position of the aforementioned guide 30 to retract from the aforementioned winding part 20.

[0217] That is, when the specified value is smaller than the first reference value, the control unit 50 determines that the pressure is greater than the appropriate pressure for the current number of winding turns, the electrode material M is tightly wound, the specified value becomes smaller than the reference value, and the configuration state needs to be corrected, thereby adjusting the position of the guide 30 to move back from the winding part 20 to reduce the pressure applied to the winding surface.

[0218] Therefore, if it is determined that the above configuration state needs to be corrected and the pressure needs to be adjusted, and if the above specification value is less than the above reference value, the control unit 50 moves the position of the guide 30 back from the winding part 20 to reduce the pressure.

[0219] In this case, the control unit 50 determines the retraction distance of the guide unit 30 based on the degree to which the specification value is less than the reference value.

[0220] That is, the control unit 50 adjusts the degree of pressure reduction by changing the retraction distance of the guide unit 30 according to the degree of difference between the specification value and the reference value.

[0221] In this case, when the difference between the above-mentioned specification value and the above-mentioned reference value is C, the forward distance of the above-mentioned guide 30 is determined to be P, so as to reduce the pressure by c. When the difference between the above-mentioned specification value and the above-mentioned reference value is greater than C by D, the backward distance of the above-mentioned guide 30 is determined to be greater than P by Q, so as to reduce the pressure by greater than C by d.

[0222] On the other hand, if the difference between the above-mentioned specification value and the above-mentioned reference value is greater than or equal to a second reference beyond the first reference, the control unit 50 determines that the above-mentioned specified pattern needs to be further corrected, thereby changing the settings of the processing unit 10.

[0223] That is, when the difference between the above specification value and the above reference value is greater than or equal to the second reference, the control unit 50 determines that it is necessary to further adjust the formation position of the above electrode tab T to correct the above configuration state, thereby changing the settings of the above processing unit 10.

[0224] In this case, the control unit 50 can change the setting of the specified pattern to change the formation position of the electrode tab T.

[0225] The process described above, which adjusts the pressure applied to the winding surface by controlling the position of the guide portion 30, is in accordance with... Figure 8 The process is carried out in the order shown.

[0226] First, when the detection unit 40 detects the insertion length (S10), the detection unit 40 transmits the detection result to the control unit 50.

[0227] When the above detection result is received, the control unit 50 calculates the above specification value based on the detection result (S20), compares the above specification value with the above reference value (S30), and controls the position of the guide unit 30 based on the comparison result (S80a to S80c).

[0228] Based on the comparison between the above-mentioned specification value and the above-mentioned reference value (S30), if the above-mentioned specification value is consistent with the above-mentioned reference value, the position of the above-mentioned guide part 30 is maintained (S80c).

[0229] That is, when the above specification value is consistent with the above reference value, the control unit 50 maintains the position of the guide 30 (S80c) and maintains the pressure applied to the winding surface.

[0230] On the other hand, in the case where the specification value and the reference value are inconsistent, the absolute value of the difference between the specification value and the reference value is compared with the first reference (S40), and the position of the guide 30 is moved (S80a or S80b) or maintained (S80c) according to the comparison result.

[0231] That is, when the above-mentioned specification value is inconsistent with the above-mentioned reference value, the control unit 50 moves the position of the guide 30 forward or backward (S80a or S80b) according to the comparison result of the above-mentioned absolute value and the above-mentioned first reference (S40), increases or decreases the pressure or maintains the position of the guide 30 (S80c) to maintain the pressure.

[0232] Based on the comparison between the absolute value and the first reference (S40), if the absolute value is less than the first reference, the position of the guide portion 30 is maintained (S80c).

[0233] That is, when the absolute value is less than the first reference, the control unit 50 maintains the position of the guide unit 30 (S80c) and maintains the pressure applied to the winding surface.

[0234] If the absolute value is greater than or equal to the first reference, the absolute value is compared with the second reference (S50), and the position of the guide 30 is advanced (S80a) or retracted (S80) according to the comparison result.

[0235] That is, when the absolute value is greater than or equal to the first reference, the control unit 50 increases or decreases the pressure by moving the position of the guide unit 30 forward or backward (S80a or S80b) based on the comparison result of the absolute value and the second reference (S50).

[0236] If the absolute value is less than the second reference, the size of the specification value and the reference value is compared (S60), and the position of the guide 30 is moved forward (S80a) or backward (S80) according to the comparison result.

[0237] That is, when the absolute value is less than the second reference, the control unit 50 moves the position of the guide 30 forward or backward (S80a or S80b) according to the comparison result of the specification value and the reference value (S60), thereby increasing or decreasing the pressure.

[0238] On the other hand, if the absolute value is greater than or equal to the second reference (S50), and the setting of the processing unit 10 is changed (S70), the size of the specification value and the reference value are compared (S60).

[0239] That is, when the absolute value is greater than or equal to the second reference, the control unit 50 changes the setting of the specified pattern (S70). After changing the processing of the processing unit 10, the position of the guide unit 30 is moved forward or backward (S80a or S80b) according to the comparison result of the size of the specification value and the reference value (S60), thereby increasing or decreasing the pressure.

[0240] Based on the comparison of the above-mentioned specification value and the above-mentioned reference value (S60), if the above-mentioned specification value is greater than the above-mentioned reference value, the position of the above-mentioned guide 30 is advanced (80a).

[0241] That is, when the above specification value is greater than the above reference value, the control unit 50 moves the position of the guide unit 30 forward (S80a) to increase the pressure.

[0242] Based on the comparison of the above-mentioned specification value and the above-mentioned reference value (S60), if the above-mentioned specification value is less than the above-mentioned reference value, the position of the above-mentioned guide 30 is moved back (80b).

[0243] That is, when the above specification value is less than the above reference value, the control unit 50 moves the position of the guide unit 30 back (S80b) to reduce the pressure.

[0244] The winding device 100 adjusts the pressure and winds the electrode material M through such a process, thereby enabling the electrode tab T to be positioned in the specific region SZ while winding the electrode material M.

[0245] The above description describes an embodiment of the winding device 100. However, various modifications can be made to the described embodiments without departing from the scope of the present invention. The scope of the present invention is not limited to the described embodiments, but should be defined according to the following claims and their equivalents.

[0246] [Symbol Explanation]

[0247] 10: Processing section; 20: Winding section

[0248] 30: Guidance Department 40: Testing Department

[0249] 50: Control unit; 100: Electrode material winding device

Claims

1. An electrode material winding device that winds an electrode material, the electrode material winding device characterized by comprising: a processing portion that processes an end portion of the electrode material in a prescribed pattern so as to form an electrode tab connected to an electrode plate at the end portion; a winding portion that winds the electrode material into a cylindrical core; a guide portion that contacts a winding surface at which the electrode material is wound, and applies pressure to the winding surface so that the electrode tab is disposed in a specific region corresponding to a portion of one or more of an upper surface and a lower surface of the core; a detection portion that detects a feed length of the electrode material fed from a front end of the winding portion; and a control portion that judges a disposition state of the electrode tab based on a result of detection by the detection portion, and controls a position of the guide portion to adjust the pressure based on a result of the judgment.

2. The electrode material winding device according to claim 1, characterized in that the electrode material includes: an electrode that is divided into a positive electrode and a negative electrode; and a separator that separates the positive electrode and the negative electrode.

3. The electrode material winding device according to claim 2, characterized in that the processing portion processes the end portion so as to form the electrode tab at a portion corresponding to the electrode.

4. The electrode material winding device according to claim 1, characterized in that the prescribed pattern is a pattern based on a position of the electrode tab corresponding to the specific region.

5. The electrode material winding device according to claim 4, characterized in that the prescribed pattern is a pattern in which one or more formed groups in which the electrode tab is formed and unformed groups in which the electrode tab is not formed are alternately formed.

6. The electrode material winding device according to claim 1, characterized in that the processing portion scores the end portion so that the electrode tab is formed in the prescribed pattern.

7. The electrode material winding device according to claim 1, characterized in that the processing portion processes the end portion so that the electrode tab is formed in the prescribed pattern, and disposition of the electrode tab forms a prescribed shape in the end surface when the electrode material is wound.

8. The electrode material winding device according to claim 7, characterized in that the prescribed shape is a shape in which blank regions are formed on both sides of the specific region, and less than a prescribed number of the electrode tabs are disposed in the blank regions.

9. The electrode material winding device according to claim 1, characterized in that the guide portion includes: a rolling portion that contacts the winding surface and guides winding of the electrode material; and a drive portion that is moved by the control portion to move a position of the rolling portion.

10. The electrode material winding device according to claim 1, characterized in that the control portion maintains, advances, or retracts the position of the guide portion based on the result of the judgment, thereby adjusting the pressure. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 11. The electrode material winding device according to claim 10, wherein the control section adjusts the position of the guide section to increase the pressure by advancing the position of the guide section toward the winding section, and adjusts the position of the guide section to decrease the pressure by retreating the position of the guide section from the winding section.

12. The electrode material winding device according to claim 1, wherein the control section calculates any one of the specification values of the winding core from the detection result, compares the specification value with a reference value based on the number of winding turns of the electrode material, and determines whether or not correction of the arrangement state is needed based on the comparison result.

13. The electrode material winding device according to claim 12, wherein in a case where a difference between the specification value and the reference value is less than a first reference, the control section determines that the position of the guide section is maintained without correcting the arrangement state.

14. The electrode material winding device according to claim 12, wherein in a case where the difference between the specification value and the reference value is the first reference or more, the control section determines that the position of the guide section is moved to correct the arrangement state.

15. The electrode material winding device according to claim 14, wherein when the specification value is greater than the reference value, the control section advances the position of the guide section toward the winding section.

16. The electrode material winding device according to claim 15, wherein the control section determines an advancing distance of the guide section according to a degree by which the specification value is greater than the reference value.

17. The electrode material winding device according to claim 14, wherein when the specification value is less than the reference value, the control section retreats the position of the guide section from the winding section.

18. The electrode material winding device according to claim 17, wherein the control section determines a retreating distance of the guide section according to a degree by which the specification value is less than the reference value.

19. The electrode material winding device according to claim 14, wherein in a case where the difference between the specification value and the reference value is a second reference or more, the control section determines that the arrangement pattern is further corrected by changing the setting of the processing section, the second reference being a reference exceeding the first reference. ​ ​ ​ ​ ​ ​ ​ ​ ​

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