Roll core testing device and roll core assembly

Abstract

The utility model describes a roll core testing device and a roll core assembly, the roll core testing device comprises a cylinder having a cavity, at least one end of the cylinder is provided with an opening communicated with the cavity along the axial direction of the cylinder, and the opening is used for a roll core to enter the cavity; and the pigment layer is arranged on the inner wall of the cylinder and surrounds the inner wall of the cylinder by a circle in the circumferential direction of the cylinder, and the pigment layer is used for being coated on the surface of the roll core when making contact with the roll core. According to the structure, the deformed roll core enters the cavity, the area with the large diameter of the roll core can abut against the inner wall of the cylinder, and the surface of the roll core can be coated with the pigment layer on the inner wall. Therefore, a worker can master the specific position where the diameter of the roll core exceeds the standard by observing the area, coated with the pigment, of the surface of the roll core, the test result is visual, the accuracy is high, and the whole operation process is convenient and rapid.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a winding core testing device and a winding core assembly. Background Art

[0002] In cylindrical lithium-ion batteries, the core of the battery cell is wound around the positive and negative electrode sheets, along with the separator, into a cylindrical structure. This wound core is then placed into a similarly cylindrical casing. However, due to external forces during processing and storage, the core can sometimes deform, sometimes becoming elliptical. This can cause the larger diameter of the core to become lodged in the casing opening, making it difficult to insert.

[0003] In existing technology, because core deformation is difficult to visually observe, workers typically use calipers to measure the core around the entire circumference to determine where the diameter exceeds the standard. However, because the core is relatively soft and elastic, workers can temporarily deform the core when holding it or measuring with calipers, resulting in inaccurate measurements. Utility Model Content

[0004] In view of the above existing situation, the present invention provides a winding core testing device and a winding core assembly to more intuitively and accurately determine at which position the diameter of the winding core exceeds the standard.

[0005] In the first aspect, the utility model provides a roll core analysis device, which includes: a cylinder having a cavity, and an opening connected to the cavity is provided at at least one end of the cylinder along the axial direction of the cylinder, and the opening is used for allowing the roll core to enter the cavity; a pigment layer is arranged on the inner wall of the cylinder, and along the circumference of the cylinder, the pigment layer is arranged around the inner wall of the cylinder, and the pigment layer is used to be coated on the surface of the roll core when in contact with the roll core.

[0006] Optionally, the cylinder includes a first end and a second end that are oppositely arranged; the opening includes a first opening opened at the first end and a second opening opened at the second end, and both the first opening and the second opening are connected to the cavity.

[0007] Optionally, the pigment layer covers the entire area of ​​the inner wall.

[0008] Optionally, the inner wall of the cylinder includes a pigment area and a blank area, and the pigment area is arranged close to the inner wall, the blank area is connected to the side of the pigment area away from the opening, and the pigment area is provided with the pigment layer.

[0009] Optionally, the core testing device also includes a guide member, which is connected to at least one end of the cylinder, and the guide member has a guide cavity, which is interconnected with the cavity and the external space; the guide member includes a first port and a second port relative to each other, the first port is connected to the cylinder, and the second port is located at the end away from the cylinder, and the diameter of the second port is larger than that of the first port.

[0010] Optionally, the cross section of the guide gradually increases in a direction away from the cylinder.

[0011] Optionally, the inner wall of the guide is provided with a transition surface connected to the cylinder, and the transition surface is an arc-shaped structure.

[0012] Optionally, the guide member is integrally formed with the cylinder.

[0013] In a second aspect, the present invention provides a winding core assembly, which includes a winding core and the winding core testing device as described above.

[0014] Optionally, the inner diameter of the cylinder is equal to the maximum outer diameter of the winding core.

[0015] The core analysis device of the present invention includes a cylinder and a pigment layer. The cylinder has a cavity, and along the axial direction of the cylinder, at least one end of the cylinder is provided with an opening connected to the cavity, the opening being used to allow the core to enter the cavity. The pigment layer is provided on the inner wall of the cylinder and, along the circumference of the cylinder, surrounds the inner wall of the cylinder. The pigment layer is used to coat the surface of the core when in contact with the core. Specifically, when a deformed core enters the cavity, the larger diameter area of ​​the core will contact the inner wall of the cylinder, and the pigment layer on the inner wall will coat the surface of the core. Thus, by observing the pigment-coated area on the core surface, a staff member can determine the specific location of the core where the diameter exceeds the standard, making the test results more intuitive. Compared to traditional caliper measurement, the core measurement device used in the present invention is more efficient, and the entire operation process is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0017] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0018] Figure 1 Schematic diagram showing the overall structure of the core testing device involved in this application.

[0019] Figure 2 It is a schematic diagram showing the overall structure of the core assembly involved in this application.

[0020] Figure 3 2 is a cross-sectional view showing a core testing device according to the present application.

[0021] Figure 4 2 is another schematic diagram showing the overall structure of the core testing device involved in this application.

[0022] Figure 5 is another cross-sectional view showing the core testing device involved in the present application.

[0023] Reference numerals: 10, core test device; 20, core; 1, cylinder; 11, blank area; 2, pigment layer; 3, guide; 31, transition surface. DETAILED DESCRIPTION

[0024] Below, with reference to the accompanying drawings, the preferred embodiments of the present application are described in detail. In the following description, the same symbols are given to the same components, and repeated descriptions are omitted. In addition, the accompanying drawings are only schematic diagrams, and the ratio of the dimensions of the components to each other or the shapes of the components may be different from the actual ones. It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0025] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0026] Reference Figure 1 and Figure 2 The present application provides a core testing device 10 comprising a cylinder 1 and a pigment layer 2. The cylinder 1 has a cavity. An opening is provided at at least one end of the cylinder 1, communicating with the cavity, along its axial direction. The opening is configured to allow a core 20 to enter the cavity. The pigment layer 2 is disposed on the inner wall of the cylinder 1 and circumferentially surrounds the inner wall of the cylinder 1. The pigment layer 2 is configured to coat the surface of the core 20 when in contact with the core 20.

[0027] According to the above structure, when the deformed core 20 enters the cavity, the larger diameter area of ​​the core 20 will contact the inner wall of the cylinder 1, and the pigment layer 2 on the inner wall will be coated on the surface of the core 20. Therefore, by observing the pigment-coated area on the core 20 surface, the staff can determine the specific location of the core 20 where the diameter exceeds the standard, making the test results intuitive and highly accurate. Compared with traditional caliper measurement, the core testing device 10 used in this application is more efficient in measuring the core 20, and the entire operation process is convenient and quick.

[0028] Specifically, the core testing device 10 is formed by pre-coating a layer of paint on the inner wall of the cylinder 1 to form a pigment layer 2. Since the specific location of the deformation and protrusion of the core 20 cannot be determined, the pigment layer 2 needs to be arranged around the inner wall of the cylinder 1 so that any deformed and protruding area of ​​the core 20 in the circumferential direction can contact the inner wall of the cylinder 1. In other words, any deformed and protruding area of ​​the core 20 in the circumferential direction can contact the pigment layer 2, so that the pigment is coated on the surface of the core 20. Figure 4 When testing the core 20, the operator places the deformed core 20 into the cavity through the opening of the cylinder 1. When the deformed portion of the core 20 contacts the pigment layer 2, the paint is applied to the surface of the core 20. The core 20 is then removed from the opening, where it is now coated. In this way, the pigmented areas on the core 20 surface visually indicate the actual diameter of the core 20, indicating which parts exceed the specified dimensional standards. The operator can quickly observe and record these pigmented areas, accurately determining which parts of the core 20 exceed the specified diameter. This method improves the efficiency of analyzing and testing the deformed core 20. It should be understood that since the deformed core 20 typically assumes an elliptical structure when deformed, the radius of each area of ​​the deformed core 20 varies, relative to the center of the core 20. Therefore, when the deformed core 20 contacts the pigment layer 2, the depth of the pigment applied to areas of the deformed core 20 with varying degrees of protrusion also varies. The paint on the core 20's surface directly indicates the degree of protrusion, significantly improving the accuracy of the test results. In subsequent work, staff will understand the location and degree of deformation of the core 20 and can manually shape the core 20 by rounding it to fit within the battery cell casing.

[0029] In some examples, the pigment layer 2 can be made of water-based paint or powder paint. When the core 20 comes into contact with the pigment layer 2, this type of paint easily adheres to the core 20. In addition, this type of paint is easy to wipe off. When the core 20 is adjusted to a suitable roundness through steps such as rounding, the paint attached to the surface of the core 20 can be wiped off. This does not affect the performance of the core 20. It should be noted that when applying the paint to the inner wall, attention should be paid to the uniformity of the coating so that a pigment layer 2 of uniform thickness can be formed. This ensures that when the deformed and protruding area of ​​the core 20 is in frictional contact with the inner wall, the paint can be evenly applied to the surface of the core 20. Among them, the pigment layer 2 is applied to the core 20, which can also be understood as the paint of the pigment layer 2 being transferred to the surface of the core 20.

[0030] In some embodiments, the cylinder 1 includes a first end and a second end that are arranged opposite to each other; the opening includes a first opening opened at the first end and a second opening opened at the second end, and the first opening and the second opening are both connected to the cavity. According to this structure, the cylinder 1 is through-through in the axial direction. When testing the core 20, the core 20 can be placed into the cavity from the first opening and then removed from the second opening. Of course, the core 20 can also be placed into the cavity from the second opening and then removed from the first opening. Specifically, it can also be understood that after the staff inserts the core 20 into one of the openings, the core 20 can pass through the cavity and be removed from the other opening. Therefore, openings are provided at both ends of the cylinder 1, which makes it easier for the staff to operate when testing the core 20. There is no need to complete both the insertion and removal operations at the same opening, thereby making the testing operation smoother and the testing process more flexible and efficient.

[0031] In other examples, the cylinder 1 may also be provided with an opening at only one end, through which the operations of inserting and removing the winding core 20 are completed.

[0032] In some embodiments, the pigment layer 2 covers the entire inner wall. Therefore, when the core 20 is inserted into the cavity, the deformed and protruding areas of the core 20 will come into frictional contact with the inner wall of the cylinder 1 both during insertion and removal. Because the entire inner wall is covered with the pigment layer 2, the deformed and protruding areas of the core 20 are fully in contact with the pigment layer 2, allowing the pigment to be fully coated on the surface of the core 20. This allows the deformed and protruding areas of the core 20 to be clearly adhered to by the pigment, allowing the operator to visually observe the deformed and protruding areas of the core 20.

[0033] By adopting this method, the deformed and protruding areas of the core 20 are in frictional contact with the inner wall of the cylinder 1 during both the process of entering the cavity and being removed, thereby fully coating the surface of the core 20 with pigment. This ensures that the deformed and protruding areas of the core 20 are clearly covered with pigment, allowing workers to visually observe the deformed and protruding areas of the core 20, thereby improving production efficiency and product quality.

[0034] In other embodiments, the pigment layer 2 covers a portion of the inner wall, thereby reducing material usage and lowering costs. Typically, the pigment layer 2 can be formed by coating the inner wall of the cylinder 1 with pigment. Covering a portion of the inner wall reduces coating time and improves efficiency. It should be noted that while the pigment layer 2 covers a portion of the inner wall, the pigment layer 2 still surrounds the inner wall of the cylinder 1.

[0035] Reference Figure 5 In some embodiments, the inner wall of the cylinder 1 includes a pigmented area and a blank area 11, with the pigmented area positioned adjacent to the inner wall and the blank area 11 connected to the pigmented area on the side facing away from the opening. The pigmented area is provided with a pigment layer 2. Specifically, taking the example of a cylinder 1 having an opening at one end, when the cylinder 1 is placed into the cavity through the opening, it passes through the pigmented area. The deformed and protruding areas of the core 20 can then frictionally contact the pigment layer 2, thereby coating the core 20 with pigment. When the core 20 is subsequently removed from the opening, the core 20 again passes through the pigmented area, frictionally contacting the pigment layer 2 again, and coating the core 20 with pigment. Thus, the location of the pigmented area allows the core 20 to adhere to pigment when it is removed, making the pigmented areas of the core 20 more noticeable and allowing workers to visually observe the deformed and protruding areas of the core 20. On the contrary, it can be understood that if the blank area 11 is set in the area close to the opening and the pigment area is connected to the side of the blank area 11 away from the opening, the roll core 20 that has been coated with pigment will rub against the blank area 11 when it is taken out, so that the pigment coated in the pigment area will adhere to the blank area 11 again. After the roll core 20 is taken out, the color of the pigment on the roll core 20 is not obvious, which is not convenient for observation.

[0036] Reference Figure 5 In some examples, when the cylinder 1 has openings at both ends, the inner wall of the cylinder 1 can be provided with two pigmented areas, one adjacent to each opening. The blank area 11 is then positioned between the two pigmented areas. This allows the core 20 to be removed from either end and come into frictional contact with the pigment layer 2, thereby coating the core 20 with pigment.

[0037] Reference Figure 1 and Figure 2In some embodiments, the core testing device 10 further includes a guide member 3 . The guide member 3 is connected to at least one end of the cylinder 1 and defines a guide cavity that interconnects the cavity and the external space. The guide member 3 includes a first port and a second port. The first port is connected to the cylinder 1, while the second port is located at the end facing away from the cylinder 1. The second port has a larger diameter than the first port. Specifically, the first port can be connected to the opening of the cylinder 1, and the first port and the opening of the cylinder 1 are the same size. This allows the core 20 to pass through the guide cavity and then into the cavity when it is inserted. Because the second port has a larger diameter than the first port, the core 20 can more easily enter the guide cavity. The structure of the guide member 3 serves to guide the core 20. Conversely, without the guide member 3 , aligning the core 20 with the opening of the cylinder 1 when the core 20 enters the cylinder 1 is time-consuming and labor-intensive.

[0038] In some examples, when both ends of the cylinder 1 are provided with openings, guide members 3 may be provided at both ends. In other examples, when both ends of the cylinder 1 are provided with openings, a guide member 3 may be provided at only one end, and when inserting the winding core 20, it can be inserted from one end of the guide member 3.

[0039] In some embodiments, the cross-section of the guide member 3 gradually increases as it moves away from the cylinder 1. It can be understood that the guide member 3 can form a trumpet-shaped structure. As the core 20 enters the guide cavity and advances toward the cavity of the cylinder 1, the guide cavity component becomes smaller. This can also be understood as the guide member 3 gradually tightening. In particular, the inner wall of the guide member 3 may abut the core 20 as it approaches the cylinder 1. Thus, the guide member 3 can gradually constrain and shape the core 20, allowing it to more smoothly enter the cavity of the cylinder 1.

[0040] Reference Figure 3 In some embodiments, the inner wall of the guide 3 is provided with a transition surface connected to the cylinder 1, and the transition surface has an arc-shaped structure. Specifically, because the core 20 is wound with the positive electrode sheet, the negative electrode sheet, and the separator, the top and bottom of the core 20 have a stacked structure. In this embodiment, the design of the transition surface prevents the positive electrode sheet, the negative electrode sheet, or the separator at the bottom or top of the core 20 from warping when the core 20 enters the cylinder 1.

[0041] In some embodiments, the guide 3 is integrally formed with the cylinder 1. This eliminates any noticeable gaps at the connection between the guide 3 and the cylinder 1, reducing potential wear points and preventing damage to the core 20. Furthermore, the integrally formed structure enhances the overall strength and durability of the core testing device 10.

[0042] The present application also provides a core assembly, which includes a core 20 and the core testing device 10 as described above.

[0043] In some embodiments, the inner diameter of cylinder 1 is equal to the maximum outer diameter of core 20. For example, if the standard diameter of core 20 is 17.5 mm ± 0.2 mm, the inner diameter of cylinder 1 is 17.7 mm. Once core 20 is inserted into cylinder 1, the larger diameter portion is coated with pigment layer 2, allowing workers to visually identify the larger diameter portion of core 20.

[0044] In summary, using the core testing device 10 of the present application, when the deformed core 20 enters the cavity, the larger diameter area of ​​the core 20 will contact the inner wall of the cylinder 1, and the pigment layer 2 on the inner wall will be coated on the surface of the core 20. Therefore, by observing the pigment-coated area on the core 20 surface, the operator can determine the specific location of the core 20 where the diameter exceeds the standard, making the test results more intuitive. Compared to traditional caliper measurements, the core testing device 10 used in the present invention measures the core 20 with higher efficiency and accuracy, and the entire operation process is convenient and quick.

[0045] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0046] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0047] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0048] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

[0049] Although the present invention has been described in detail above with reference to the accompanying drawings and embodiments, it should be understood that the above description does not limit the present invention in any form. Those skilled in the art may modify and alter the present invention as needed without departing from the spirit and scope of the present invention, and such modifications and alterations are intended to fall within the scope of the present invention.

Claims

1. A core testing device, characterized in that: include: A cylinder having a cavity, wherein at least one end of the cylinder is provided with an opening communicating with the cavity along the axial direction of the cylinder, and the opening is used for allowing the winding core to enter the cavity; The pigment layer is arranged on the inner wall of the cylinder and surrounds the inner wall of the cylinder along the circumference of the cylinder. The pigment layer is used to be coated on the surface of the core when in contact with the core.

2. The core testing device according to claim 1, characterized in that: The cylinder includes a first end and a second end disposed opposite to each other; The opening includes a first opening opened at the first end and a second opening opened at the second end, and both the first opening and the second opening are communicated with the cavity.

3. The core testing device according to claim 1, characterized in that: The pigment layer covers the entire area of ​​the inner wall.

4. The core testing device according to claim 1, characterized in that: The inner wall of the cylinder includes a pigment area and a blank area, and the pigment area is arranged close to the inner wall, the blank area is connected to the side of the pigment area away from the opening, and the pigment area is provided with the pigment layer.

5. The core testing device according to any one of claims 1 to 4, characterized in that: The core testing device further includes a guide member, at least one end of the cylinder is connected to the guide member, the guide member has a guide cavity, and the guide cavity is interconnected with the cavity and the external space; The guide member includes a first port and a second port opposite to each other, the first port is connected to the cylinder, the second port is located at an end away from the cylinder, and the diameter of the second port is larger than that of the first port.

6. The core testing device according to claim 5, characterized in that: The cross section of the guide gradually increases in a direction away from the cylinder.

7. The core testing device according to claim 5, characterized in that: The inner wall of the guide is provided with a transition surface connected to the cylinder, and the transition surface is an arc-shaped structure.

8. The core testing device according to claim 5, characterized in that: The guide is integrally formed with the cylinder.

9. A core assembly, characterized in that: The invention comprises a winding core and a winding core testing device as claimed in any one of claims 1 to 8.

10. The winding core assembly according to claim 9, characterized in that: The inner diameter of the cylinder is equal to the maximum outer diameter of the winding core.

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