Checking jig and winding device

Abstract

The embodiment of the utility model provides a verification jig and a winding device, the verification jig is used in the winding device, the winding device comprises a winding needle and two clamping needles, the winding needle is used for winding an electrode assembly and comprises two first grooves, the first grooves are recessed inwards from the outer circumferential surface of the winding needle, and the two first grooves are arranged at intervals in the radial direction of the winding needle; the two clamping needles are used for respectively extending into the two first grooves and opening the electrode assembly; the checking jig is provided with a second groove, the checking jig is configured to be arranged in the first groove, the two opposite side walls of the second groove are used for extending into the first groove and abutting against the two opposite side faces of the first groove in a one-to-one mode, and the second groove is used for containing the clamping needle and allowing the clamping needle to penetrate through the checking jig in the axial direction of the winding needle; a containing space is formed between the two side walls and is larger than the size of the clamping needle in the first direction, and the first direction is parallel to the arrangement direction of the two side faces. According to the invention, the yield of the electrode assembly can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more particularly, to a calibration jig and a winding device. Background Art

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] In the development of battery technology, how to improve the yield rate of electrode assemblies in battery cells is a research direction in battery technology. Utility Model Content

[0004] The present application provides a calibration jig and a winding device, which can improve the yield rate of electrode assemblies.

[0005] An embodiment of the present application provides a calibration jig for use in a winding device, the winding device including a winding needle and two clamping needles, the winding needle being used to wind the electrode assembly and including two first grooves, the first groove being recessed inward from the outer circumference of the winding needle, the two first grooves being spaced apart along the radial direction of the winding needle; the two clamping needles being used to respectively extend into the two first grooves and to spread the electrode assembly; the calibration jig is provided with a second groove, the calibration jig being configured to be able to be set in the first groove, the two opposite side walls of the second groove being used to extend into the first groove and to abut against the two side faces opposite to the first groove one by one, the second groove being used to accommodate the clamping needle and allowing the clamping needle to pass through the calibration jig along the axial direction of the winding needle, the two side walls having an accommodation spacing, the accommodation spacing being greater than the size of the clamping needle along the first direction, the first direction being parallel to the arrangement direction of the two side faces.

[0006] In the above technical solution, the calibration jig of the embodiment of the present application is provided with a second groove, and uses whether the two side walls of the second groove in the calibration jig smoothly extend between the clamping needle and the side surface to detect the upper and lower centering of the clamping needle. The result is more accurate than the visual inspection, and the position accuracy of the clamping needle is improved, thereby reducing the cracking problem of the inner ring electrode when the clamping needle is subsequently opened, and improving the yield rate of the electrode assembly.

[0007] In some embodiments, the two side walls have the same size along the arrangement direction of the two side walls.

[0008] In the above technical solution, the position accuracy of the inspection clamping needle is improved.

[0009] In some embodiments, an end of the side wall away from the bottom wall of the second groove includes a guide surface, and the guide surface is used to guide the side wall into between the clamping needle and the side surface.

[0010] In the above technical solution, a guide surface is provided to facilitate the side wall to enter between the clamping needle and the side surface, thereby improving the inspection efficiency.

[0011] In some embodiments, the end of the side wall away from the bottom wall of the second groove also includes a buffer surface, which is connected to the guide surface at an angle and is located on the side of the guide surface close to the clamping needle, and the buffer surface is parallel to the first direction.

[0012] In the above technical solution, the provision of the buffer surface can reduce the problem of possible injury to the operator caused by the sharp end of the side wall when only the guide surface is provided, thereby improving the reliability of the calibration fixture.

[0013] In some embodiments, at least one side wall is provided with a scale portion, which extends in the depth direction of the second groove. The calibration jig is used to abut against the preset position of the winding needle. When the calibration jig abuts against the preset position of the winding needle, the second groove is configured to accommodate the outer edge of the bottom wall of the clamping needle facing away from the first groove, and the scale portion is set to have a projection on the clamping needle along the first direction covering the maximum tolerance position allowed for the outer edge of the clamping needle.

[0014] In the above technical solution, the scale portion is configured to project onto the clamping needle along the first direction to cover the maximum tolerance position allowed for the outer edge of the clamping needle, and the size of the outer edge of the clamping needle relative to the scale portion is measured to determine whether the left-right centering of the two clamping needles meets the requirements, thereby realizing the inspection of the left-right centering of the two clamping needles, further improving the position accuracy of the clamping needles, thereby reducing the problem of cracking of the inner ring electrode when the two clamping needles are spread apart, and improving the yield rate of the electrode assembly.

[0015] In some embodiments, the preset position includes a bottom wall of the first groove, and the end of the side wall is used to abut against the bottom wall of the first groove.

[0016] In the above technical solution, the end of the side wall is used to abut against the bottom wall of the first groove, which is more convenient to use.

[0017] In some embodiments, the scale portion extends from the opening of the second groove at least to the bottom wall of the second groove.

[0018] In the above technical solution, the measuring range of the scale part is large and the application scenarios are wide.

[0019] In some embodiments, the calibration jig includes a main body and a convex portion, the main body is provided with a second groove and includes a side wall, the main body is provided with a convex portion on at least one side along the first direction, the preset position includes the outer edge of the winding needle, and the convex portion is used to abut against the outer edge of the winding needle.

[0020] In the above technical solution, the preset position is set as the outer edge of the winding needle, which makes it easier for the operator to check whether the calibration fixture is stuck in the preset position, thereby improving the accuracy of the inspection result.

[0021] In some embodiments, when the calibration jig is against a preset position of the winding needle, the bottom wall of the second groove is located outside the first groove.

[0022] In the above technical solution, the applicable scope of the calibration fixture can be increased.

[0023] In some embodiments, when the calibration jig is against a preset position of the winding needle, the bottom wall of the second groove is configured to be located at a maximum tolerance position allowed for the outer edge of the clamping needle.

[0024] In the above technical solution, when the outer edge of the clamping needle exceeds the maximum allowable tolerance, the calibration fixture will not be able to reach the preset position. Therefore, it can be directly determined that the left and right centering of the clamping needle does not meet the requirements, thereby improving the calibration efficiency.

[0025] In the second aspect, an embodiment of the present application also provides a winding device, including a winding needle, two clamping needles and a calibration jig. The winding needle is used to wind the electrode assembly. The winding needle includes two first grooves, the first grooves are recessed inward from the outer circumference of the winding needle, and the two first grooves are arranged at intervals along the radial direction of the winding needle; the two clamping needles are used to extend into the two first grooves respectively and stretch the electrode assembly; the calibration jig is provided with a second groove, and the calibration jig is configured to be able to be set in the first groove, and the two opposite side walls of the second groove are used to extend into the first groove and abut against the two side faces opposite to the first groove one by one, the second groove is used to accommodate the clamping needle and allow the clamping needle to pass through the calibration jig along the axial direction of the winding needle, and there is an accommodation spacing between the two side walls, the accommodation spacing is greater than the size of the clamping needle along the first direction, and the first direction is parallel to the arrangement direction of the two side faces. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0027] Figure 1 A schematic structural diagram of a winding device provided in some embodiments of the present application;

[0028] Figure 2 A schematic diagram of the structure of a calibration fixture provided in some embodiments of the present application;

[0029] Figure 3 Another structural schematic diagram of a winding device provided in some embodiments of the present application;

[0030] Figure 4 for Figure 3 Enlarged view at point A.

[0031] The reference numerals for the specific embodiments are as follows:

[0032] 100. Winding device;

[0033] 1. Winding needle; 11. First groove; 12. Side; 13. Outer edge; 14. Bottom wall of the first groove;

[0034] 2. Clamping needle; 21. Outer edge; 22. Mounting portion; 23. Insertion portion;

[0035] 3. Calibration fixture; 31. Second groove; 32. Side wall; 321. Scale portion; 322. Guide surface; 323. Buffer surface; 33. Main body; 34. Protrusion; 35. Bottom wall of second groove;

[0036] X, first direction. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0039] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0042] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0043] The term "plurality" used in this application refers to two or more (including two).

[0044] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell primarily relies on the movement of metal ions between the positive and negative electrode sheets to operate. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode tab connected to the positive coating area. The positive coating area is coated with the positive active material layer, while the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, which is coated on the surface of the negative electrode current collector. The negative electrode current collector includes a negative electrode coating region and a negative electrode tab connected to the negative electrode coating region. The negative electrode coating region is coated with the negative electrode active material layer, while the negative electrode tab is not coated with the negative electrode active material layer. The negative electrode current collector can be made of copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0045] During the electrode assembly winding process, a winding pin is used to wind the positive electrode sheet, separator, and negative electrode sheet. Once winding is complete, a clamping pin is used to pick up the electrode assembly. Specifically, two clamping pins extend into the corresponding grooves of the winding pins. After the winding pin is pulled out, the two clamping pins stretch the electrode assembly outward, moving the electrode assembly to the next step.

[0046] Typically, the grooves of the winding pins are large. If the clamping pins are not within the predetermined area within the grooves, for example, they are located above or below the predetermined area, that is, if the vertical alignment of the clamping pins is abnormal, the two clamping pins will be stretched apart, causing the upper and lower semicircles of the electrode assembly to be uneven. This will cause uneven force on the electrode assembly, cracking the inner electrode sheet of the electrode assembly, and reducing the yield rate of the electrode assembly. The current method of verifying whether the clamping pins are within the predetermined area is usually visual inspection, which is not very accurate.

[0047] In view of this, the present application provides a calibration jig, which checks the upper and lower centering of the clamping needle by checking whether the two side walls of the first groove of the calibration jig can extend between the clamping needle and the side of the first groove. Compared with visual inspection, the accuracy of the inspection can be improved, that is, the position accuracy of the clamping needle is improved, thereby reducing the problem of cracking of the electrode sheet when the clamping needle is opened, and improving the yield rate of the electrode assembly.

[0048] Figure 1 A schematic structural diagram of a winding device provided in some embodiments of the present application; Figure 2 A schematic diagram of the structure of a calibration fixture provided in some embodiments of the present application; Figure 3 Another structural schematic diagram of the winding device provided in some embodiments of the present application.

[0049] like Figure 1-Figure 3 As shown, an embodiment of the present application provides a calibration jig 3 for use in a winding device 100. The winding device 100 includes a winding needle 1 and two clamping needles 2. The winding needle 1 is used to wind the electrode assembly and includes two first grooves 11 recessed inward from the outer circumference of the winding needle 1. The two first grooves 11 are spaced radially apart along the winding needle 1. The two clamping needles 2 are configured to extend into the two first grooves 11 and spread the electrode assembly apart. The calibration jig 3 includes a second groove 31 configured to be positioned within the first groove 11. The opposing sidewalls 32 of the second groove 31 are configured to extend into the first groove 11 and abut against the opposing sidewalls 12 of the first groove 11. The second groove 31 is configured to accommodate the clamping needles 2 and allow them to pass through the calibration jig 3 axially along the winding needle 1. A spacing is defined between the two sidewalls 32. The spacing is greater than the dimension of the clamping needles 2 along a first direction X, which is parallel to the arrangement direction of the two sidewalls 12.

[0050] In the embodiment of the present application, the two first grooves 11 are arranged at intervals along the radial direction of the winding needle 1 , that is, the two first grooves 11 are arranged at intervals along the diameter direction of the winding needle 1 .

[0051] The two side walls 32 of the calibration fixture 3 of the embodiment of the present application may have the same or different dimensions along the first direction X. The arrangement direction of the two side surfaces 12 of the embodiment of the present application refers to the arrangement direction from one side surface 12 to the other side surface 12 .

[0052] The side wall 32 of the embodiment of the present application may abut against the bottom wall 14 of the first groove, or may have a distance therebetween.

[0053] Optionally, the two side walls 32 are configured to fit in a one-to-one relationship with the two side surfaces 12 .

[0054] The accommodation spacing between the two side walls 32 in the embodiment of the present application refers to the sum of the size required to accommodate the clamping needle 2 in the first direction X and the size deviation in the first direction X when allowing the clamping needle 2 to extend into the first groove 11.

[0055] The calibration jig 3 of the present embodiment inspects the portion of the clamping needle 2 inserted into the first groove 11. For example, the clamping needle 2 includes a mounting portion 22 and an insertion portion 23. The mounting portion 22 is used to mount the clamping needle 2, and the insertion portion 23 is used to insert into the first groove 11. The calibration jig 3 is used to inspect the insertion portion 23. The cross-sectional dimensions of the insertion portion 23 are smaller than those of the mounting portion 22.

[0056] During calibration, the calibration jig 3 of the embodiment of the present application is inserted into the first groove 11. If the two side walls 32 of the calibration jig 3 are smoothly inserted between the clamping needle 2 and the side surface 12, it means that the upper and lower centering degrees of the clamping needle 2 meet the requirements. Otherwise, if the requirements are not met, the machine needs to be stopped to provide feedback and notify personnel to handle the matter.

[0057] The calibration jig 3 of the embodiment of the present application is provided with a second groove 31, and uses the two side walls 32 of the second groove 31 in the calibration jig 3 to smoothly extend between the clamping needle 2 and the side surface 12 to detect the upper and lower centering of the clamping needle 2. The result is more accurate than the visual inspection, and the position accuracy of the clamping needle 2 is improved, thereby reducing the cracking problem of the inner ring electrode when the clamping needle 2 is subsequently opened, and improving the yield rate of the electrode assembly.

[0058] Figure 4 for Figure 3 Enlarged view at point A.

[0059] See also Figure 4 In some embodiments, the accommodation spacing is h1, the size of the clamping needle 2 along the first direction X is h2, and h1 and h2 satisfy: 1.5mm≤h1-h2≤2.5mm.

[0060] Optionally, the value of h1-h2 may be 1.5 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.4 mm or 2.5 mm.

[0061] The value of h1-h2 is limited to greater than or equal to 1.5 mm to increase the allowable extension deviation of the clamping needle 2 in the first direction X. The value of h1-h2 is limited to less than or equal to 2.5 mm to improve the position accuracy of the clamping needle 2 along the first direction X and further reduce the problem of cracking of the electrode assembly.

[0062] In some embodiments, h1 and h2 satisfy: 1.8 mm ≤ h1 - h2 ≤ 2.2 mm.

[0063] Optionally, the value of h1-h2 may be 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm or 2.2 mm.

[0064] The value of h1-h2 is limited to greater than or equal to 1.8 mm to further increase the allowable extension deviation of the clamping needle 2 in the first direction X. The value of h1-h2 is limited to less than or equal to 2.2 mm to further improve the position accuracy of the clamping needle 2 along the first direction X and reduce the problem of cracking of the electrode assembly.

[0065] In some embodiments, the two side walls 32 have the same size along the arrangement direction of the two side walls 32 .

[0066] During verification, the arrangement direction of the two side walls 32 is parallel to the first direction X.

[0067] Optionally, the two side walls 32 are symmetrically arranged.

[0068] This arrangement is used to improve the position accuracy of the inspection needle 2.

[0069] In some embodiments, one end of the side wall 32 away from the bottom wall 35 of the second groove includes a guide surface 322 , and the guide surface 322 is used to guide the side wall 32 to enter between the clamping needle 2 and the side surface 12 .

[0070] The end of the side wall 32 of the embodiment of the present application may include only the guide surface 322, or may include other surfaces in addition to the guide surface 322. Figure 2 Taking the upper side wall 32 as an example, the guide surface 322 is inclined upward from left to right, that is, the size thereof in the first direction X gradually increases from left to right. Figure 2 Taking the lower side wall 32 as an example, the guide surface 322 is inclined downward from left to right, and also presents a trend of gradually increasing in size in the first direction X from left to right.

[0071] The guide surface 322 in the embodiment of the present application can be a flat surface or a curved surface.

[0072] The guide surface 322 is provided to facilitate the side wall 32 to enter between the clamping needle 2 and the side surface 12, thereby improving the inspection efficiency.

[0073] In some embodiments, the end of the side wall 32 away from the bottom wall 35 of the second groove also includes a buffer surface 323, the buffer surface 323 is connected to the guide surface 322 at an angle, and is located on the side of the guide surface 322 close to the clamping needle 2, and the buffer surface 323 is parallel to the first direction X.

[0074] The buffer surface 323 in the embodiment of the present application can be a flat surface or a curved surface.

[0075] Optionally, the buffer surface 323 is a plane and perpendicular to the depth direction of the second groove 31 .

[0076] Providing the buffer surface 323 can reduce the problem of possible injury to the operator caused by the sharp end of the side wall 32 when only the guide surface 322 is provided, thereby improving the reliability of the calibration fixture 3.

[0077] In some embodiments, at least one side wall 32 is provided with a scale portion 321, which extends along the depth direction of the second groove 31. The calibration jig 3 is used to abut against the preset position of the winding needle 1. When the calibration jig 3 abuts against the preset position of the winding needle 1, the second groove 31 is configured to accommodate the outer edge of the clamping needle 2 away from the bottom wall 14 of the first groove, and the scale portion 321 is set to a projection on the clamping needle 2 along the first direction X to cover the maximum tolerance position allowed for the outer edge 21 of the clamping needle 2.

[0078] The scale portion 321 in the embodiment of the present application may be an adhesive layer, an etching layer, or may be formed by other methods.

[0079] Exemplarily, the precision of the scale portion 321 is 1 mm.

[0080] The calibration fixture 3 of the embodiment of the present application is against the preset position of the winding needle 1, that is, the scale part 321 is located at a certain position relative to the winding needle 1 before measurement. In this way, the scale part 321 can accurately measure the size of the outer edge 21 of the clamping needle 2 relative to the scale part 321.

[0081] The maximum tolerance position allowed for the outer edge 21 in the embodiment of the present application refers to the maximum left or right deviation position allowed for the outer edge 21 .

[0082] In the embodiment of the present application, the depth direction of the second groove 31 refers to the direction from the opening of the second groove 31 to the bottom wall 35 of the second groove. When the inspection jig is in the preset position of the winding pin 1, the position of the bottom wall 35 of the second groove should at least meet the maximum tolerance allowed by the outer edge 21. If the outer edge 21 of the clamping pin 2 interferes with the bottom wall 35 of the second groove, causing the inspection jig 3 to not be in the preset position, the position of the clamping pin 2 needs to be adjusted.

[0083] The second groove 31 of the embodiment of the present application accommodates the outer edge 21 of the clamping needle 2 away from the bottom wall 14 of the first groove, wherein the outer edge 21 of the clamping needle 2 away from the bottom wall 14 of the first groove refers to the outer edge 21 of the clamping needle 2 facing the opening side of the first groove 11.

[0084] When using the calibration jig 3 of the embodiment of the present application, the calibration jig 3 is placed against the preset position of the winding needle 1. If the calibration jig 3 cannot be placed in the preset position, it may be that the vertical alignment of the clamping needle 2 does not meet the requirements, or the outer edge 21 of the clamping needle 2 interferes with the bottom wall 35 of the second groove. In both cases, the position of the clamping needle 2 needs to be adjusted. If the calibration jig 3 is placed in the preset position, check the size of the outer edge 21 of one clamping needle 2 relative to the scale portion 321 and record it, for example, the size is L1. Then check the size of the outer edge 21 of the other clamping needle 2 relative to the scale portion 321 and record it, for example, the size is L2. If |L1-L2|≤L3, the left and right alignment of the clamping needle 2 meets the requirements. Otherwise, it does not meet the requirements and the position of the clamping needle 2 needs to be readjusted until it meets the requirements. The value of L3 depends on the actual usage. Optionally, 0.5mm≤L3≤1.5mm. Further, 0.75mm≤L3≤1mm.

[0085] Exemplarily, the scale value of the scale portion 321 gradually increases along the direction from the open end of the side wall 32 to the bottom wall 35 of the second groove. When the outer edge 21 of the clamping needle 2 exceeds the maximum allowable tolerance position, it means that the clamping needle 2 is relatively close to the outside and is prone to cracking the inner ring pole piece when it is stretched. When the scale values corresponding to the outer edges 21 of the two clamping needles 2 differ greatly, the amplitudes of the inner ring pole pieces stretched by the two clamping needles 2 are obviously different, so that the inner ring pole pieces are unevenly stressed, which can also lead to cracking problems. The scale portion 321 of the calibration jig 3 will calibrate these problems and improve the left and right centering accuracy of the clamping needle 2.

[0086] The scale portion 321 is set to project along the first direction X onto the clamping needle 2 to cover the maximum tolerance position allowed for the outer edge 21 of the clamping needle 2. The size of the outer edge 21 of the clamping needle 2 relative to the scale portion 321 is measured to determine whether the left and right centering of the two clamping needles 2 meets the requirements, thereby realizing the inspection of the left and right centering of the two clamping needles 2, further improving the position accuracy of the clamping needle 2, thereby reducing the problem of cracking of the inner ring electrode when the two clamping needles 2 are spread apart, and improving the yield rate of the electrode assembly.

[0087] In some embodiments, the predetermined position includes the bottom wall 14 of the first groove, and the end of the side wall 32 is configured to abut against the bottom wall 14 of the first groove.

[0088] The end portion of the side wall 32 in the embodiment of the present application refers to an end of the side wall 32 located at the opening of the second groove 31 .

[0089] The end of the side wall 32 abuts against the bottom wall 14 of the first groove, which makes it more convenient to use.

[0090] In some embodiments, the scale portion 321 extends from the opening of the second groove 31 at least to the bottom wall 35 of the second groove.

[0091] In this way, the measuring range of the scale portion 321 is larger and its application scenarios are wider.

[0092] In some embodiments, the calibration jig 3 includes a main body 33 and a protrusion 34. The main body 33 is provided with a second groove 31 and includes a side wall 32. The main body 33 is provided with a protrusion 34 on at least one side along the first direction X. The preset position includes the outer edge 13 of the winding needle 1, and the protrusion 34 is used to abut against the outer edge 13 of the winding needle 1.

[0093] The protrusion 34 of the embodiment of the present application can be integrally formed with the main body 33, or can be connected by welding or other methods.

[0094] The shape of the protrusion 34 in the embodiment of the present application can be a cuboid, a triangular pyramid, or a special shape.

[0095] Optionally, two opposite sides of the main body 33 along the first direction X are provided with protrusions 34 .

[0096] The outer edge 13 of the winding needle 1 in the embodiment of the present application refers to the outer edge 13 of the winding needle 1 close to the opening of the first groove 11 .

[0097] The preset position is set as the outer edge 13 of the winding needle 1, so that the operator can easily check whether the verification jig 3 is stuck in the preset position, thereby improving the accuracy of the inspection result.

[0098] In some embodiments, when the calibration jig 3 is in contact with the preset position of the winding needle 1 , the bottom wall 35 of the second groove is located outside the first groove 11 .

[0099] Such an arrangement can increase the applicable scope of the calibration fixture 3.

[0100] In some embodiments, when the calibration jig 3 is against the preset position of the winding needle 1 , the bottom wall 35 of the second groove is configured to be located at the maximum tolerance position allowed for the outer edge 21 of the clamping needle 2 .

[0101] When the outer edge 21 of the clamping needle 2 exceeds the maximum allowable tolerance, the calibration fixture 3 will be unable to reach the preset position. Therefore, it can be directly determined that the left and right centering of the clamping needle 2 does not meet the requirements, thereby improving the inspection efficiency.

[0102] In some embodiments, when the calibration jig 3 is against the preset position of the winding needle 1 , the height of the bottom wall 35 of the second groove relative to the outer edge 13 of the winding needle 1 is a, and a satisfies: 0mm≤a≤1mm.

[0103] In the embodiment of the present application, the height of the bottom wall 35 of the second groove relative to the outer edge 13 of the winding needle 1 is the maximum tolerance position allowed for the outer edge 21 of the clamping needle 2 .

[0104] The height of the bottom wall 35 of the second groove implemented in this application relative to the outer edge 13 of the winding needle 1 refers to the distance between the bottom wall 35 of the second groove and the outer circumferential line of the winding needle 1, which is equivalent to the first groove 11 being closed by the outer circumferential line, and the distance between the bottom wall 35 of the second groove and the outer circumferential line of the seal.

[0105] Optionally, the value of a can be 0 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm or 1 mm.

[0106] The height of the bottom wall 35 of the second groove relative to the outer edge 13 of the winding needle 1 is limited to less than or equal to 1 mm. When the clamping needle 2 exceeds 1 mm outside the first groove 11, the verification fixture 3 cannot reach the preset position. Therefore, it can be directly determined that the left and right centering of the clamping needle 2 does not meet the requirements, thereby improving the inspection efficiency.

[0107] In some embodiments, a satisfies: 0.5 mm ≤ a ≤ 1 mm.

[0108] Optionally, the value of a can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm.

[0109] By limiting the height of the bottom wall 35 of the second groove relative to the outer edge 13 of the winding needle 1 to be greater than or equal to 0.5 mm, the applicable range of the calibration jig 3 can be further improved.

[0110] Secondly, embodiments of the present application further provide a winding device 100 comprising a winding needle 1, two clamping needles 2, and a calibration jig 3. The winding needle 1 is used to wind the electrode assembly and includes two first grooves 11 recessed inward from the outer circumference of the winding needle 1. The two first grooves 11 are spaced radially apart along the winding needle 1. The two clamping needles 2 are configured to extend into the two first grooves 11 and spread the electrode assembly. The calibration jig 3 includes a second groove 31 configured to be positioned within the first groove 11. The opposing sidewalls 32 of the second groove 31 are configured to extend into the first groove 11 and abut against the opposing sidewalls 12 of the first groove 11. The second groove 31 is configured to accommodate the clamping needles 2 and allow them to pass through the calibration jig 3 axially along the winding needle 1. A spacing is defined between the two sidewalls 32, which is greater than the dimension of the clamping needles 2 along a first direction X, parallel to the arrangement of the two sidewalls 12.

[0111] See also Figures 1-4 The present application provides a calibration jig 3 for use in a winding device 100. The winding device 100 includes a winding needle 1 and two clamping needles 2. The winding needle 1 is used to wind the electrode assembly. The winding needle 1 includes two first grooves 11, which are recessed inward from the outer circumference of the winding needle 1 and spaced radially apart from each other. The two clamping needles 2 are used to extend into the two first grooves 11 and spread the electrode assembly apart. The calibration jig 3 is provided with a second groove 31. The calibration jig 3 is configured to be disposed in the first groove 11. The two opposing sidewalls 32 of the second groove 31 are used to extend into the first groove 11 and abut against the two opposing side surfaces 12 of the first groove 11. The second groove 31 is used to accommodate the clamping needles 2 and allow the clamping needles 2 to pass through the calibration jig 3 along the axial direction of the winding needle 1. A spacing is defined between the two sidewalls 32. The spacing is greater than the dimension of the clamping needle 2 along a first direction X. The first direction X is parallel to the arrangement direction of the two side surfaces 12. The two side walls 32 have the same dimensions along the direction in which they are arranged. At least one side wall 32 is provided with a scale portion 321 extending in the depth direction of the second groove 31. The calibration jig 3 is used to abut against the preset position of the winding needle 1. When the calibration jig 3 is abutting against the preset position of the winding needle 1, the second groove 31 is configured to accommodate the outer edge of the clamping needle 2 facing away from the bottom wall 14 of the first groove. The scale portion 321 is configured so that its projection on the clamping needle 2 along the first direction X covers the maximum tolerance position allowed for the outer edge 21 of the clamping needle 2. The calibration jig 3 includes a main body 33 and a protrusion 34. The main body 33 is provided with the second groove 31 and includes side walls 32. The main body 33 is provided with a protrusion 34 on at least one side along the first direction X. The preset position includes the outer edge 13 of the winding needle 1. The protrusion 34 is used to abut against the outer edge 13 of the winding needle 1. When the calibration jig 3 is in contact with the preset position of the winding needle 1 , the bottom wall 35 of the second groove is configured to be located at the maximum tolerance position allowed for the outer edge 21 of the clamping needle 2 .

[0112] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A calibration jig for use in a winding device, the winding device comprising a winding needle and two clamping needles, the winding needle being used to wind an electrode assembly and comprising two first grooves, the first grooves being recessed inwardly from the outer circumference of the winding needle, the two first grooves being spaced apart along the radial direction of the winding needle; the two clamping needles being used to respectively extend into the two first grooves and spread the electrode assembly; characterized in that: The calibration jig is provided with a second groove, and the calibration jig is configured to be able to be set in the first groove. The two opposite side walls of the second groove are used to extend into the first groove and abut against the two side surfaces opposite to the first groove one by one. The second groove is used to accommodate the clamping needle and allow the clamping needle to pass through the calibration jig along the axial direction of the winding needle. There is an accommodation spacing between the two side walls, and the accommodation spacing is greater than the size of the clamping needle along the first direction, and the first direction is parallel to the arrangement direction of the two side surfaces.

2. The calibration fixture according to claim 1, characterized in that: The two side walls have the same size along the arrangement direction of the two side walls.

3. The calibration fixture according to claim 1, characterized in that: One end of the side wall away from the bottom wall of the second groove includes a guide surface, and the guide surface is used to guide the side wall to enter between the clamping needle and the side surface.

4. The calibration fixture according to claim 3, characterized in that: One end of the side wall away from the bottom wall of the second groove also includes a buffer surface, which is connected to the guide surface at an angle and is located on the side of the guide surface close to the clamping needle. The buffer surface is parallel to the first direction.

5. The calibration jig according to any one of claims 1 to 4, characterized in that: At least one of the side walls is provided with a scale portion, which extends along the depth direction of the second groove. The calibration jig is used to abut against the preset position of the winding needle. When the calibration jig abuts against the preset position of the winding needle, the second groove is configured to accommodate the outer edge of the bottom wall of the clamping needle away from the first groove, and the scale portion is set to have a projection on the clamping needle along the first direction covering the maximum tolerance position allowed for the outer edge of the clamping needle.

6. The calibration jig according to claim 5, characterized in that: The preset position includes the bottom wall of the first groove, and the end of the side wall is used to abut against the bottom wall of the first groove.

7. The calibration jig according to claim 5, characterized in that: The scale portion extends from the opening of the second groove at least to the bottom wall of the second groove.

8. The calibration jig according to claim 5, characterized in that: The calibration jig includes a main body and a convex portion, the main body is provided with the second groove and includes the side wall, the main body is provided with the convex portion on at least one side along the first direction, the preset position includes the outer edge of the winding needle, and the convex portion is used to abut against the outer edge of the winding needle.

9. The calibration jig according to claim 5, characterized in that: When the calibration jig is against the preset position of the winding needle, the bottom wall of the second groove is located outside the first groove.

10. The calibration jig according to claim 5, characterized in that: When the calibration jig is against the preset position of the winding needle, the bottom wall of the second groove is configured to be located at a maximum tolerance position allowed for the outer edge of the clamping needle.

11. A winding device, characterized in that: include: A winding needle for winding the electrode assembly, the winding needle comprising two first grooves, the first grooves being recessed inward from the outer circumference of the winding needle, the two first grooves being spaced apart along the radial direction of the winding needle; two clamping needles, used to respectively extend into the two first grooves and open the electrode assembly; The calibration jig is provided with a second groove, and the calibration jig is configured to be able to be set in the first groove. The two opposite side walls of the second groove are used to extend into the first groove and abut against the two side surfaces opposite to the first groove one by one. The second groove is used to accommodate the clamping needle and allow the clamping needle to pass through the calibration jig along the axial direction of the winding needle. There is an accommodation spacing between the two side walls, and the accommodation spacing is greater than the size of the clamping needle along the first direction, and the first direction is parallel to the arrangement direction of the two side surfaces.

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