Pole piece extension testing device

Abstract

The utility model relates to a pole piece extension testing device which is used for testing the extension state of a pole piece and comprises a testing frame and a tensioning piece, the testing frame is provided with a horizontal testing surface, and the edge of one side of the horizontal testing surface is a reference edge; a reference straight line I and a reference straight line II which extends from the reference edge of the reference straight line I to the inside of the reference straight line I and is vertically intersected with the reference straight line I are arranged on the horizontal test surface; one end of the pole piece is fixed on the horizontal test surface, the other end of the pole piece crosses the reference edge and vertically extends downwards, and two ends of the reference straight line II are aligned with one side of the length direction of the pole piece; and the tensioning piece is fixed at the other end of the pole piece so as to tension the pole piece. The device is simple in structure, convenient and efficient to operate and capable of rapidly testing the extension state of the pole piece.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, in particular to a pole piece extension testing device. Background Art

[0002] With the development of new energy vehicles, lithium-ion batteries have gained widespread application, and the lithium battery industry has promising growth prospects both domestically and internationally. Electrodes are a crucial component of lithium-ion batteries, consisting of a coated area (where active material is applied) and a blank area (where no active material is applied). During the electrode manufacturing process, the blank area is stretched to a predetermined thickness before the tabs are cut to accommodate subsequent battery production.

[0003] In lithium battery production, the difference between the extension of the electrode foil and the extension of the coating area is a critical parameter. When the foil extension is less than the extension of the coating area, it is likely that the foil has not been fully extended, which can easily cause the tabs to stick to the edges. When the foil extension is greater than the extension of the coating area, the foil is over-extended, which can easily lead to low electrode strength and easy breakage. Existing electrode production lacks such tools to test the electrode's extension state. This makes it impossible to obtain the electrode's extension state and provide guidance data for existing production, resulting in low production yield and inability to improve efficiency. Utility Model Content

[0004] Based on this, in order to solve the technical problems in which the existing electrode production lacks such tools that can test the extension state of the electrode, the extension state of the electrode cannot be obtained, and guidance data cannot be provided for the existing production, resulting in low production yield and inability to improve efficiency, the utility model provides a electrode extension measurement device.

[0005] The utility model provides a pole piece extension test device, which is used to test the extension state of the pole piece, and includes a test frame and a tensioning piece. The test frame has a horizontal test surface, and one side edge of the horizontal test surface is a reference edge. The horizontal test surface is provided with a reference straight line 1 and a reference straight line 2 extending from its reference edge toward its interior and perpendicularly intersecting with the reference straight line 1; one end of the pole piece is fixed on the horizontal test surface, and the other end of the pole piece extends vertically downward across the reference edge, and both ends of the reference straight line 2 are aligned with one side of the length direction of the pole piece; the tensioning piece is fixed to the other end of the pole piece to tension the pole piece.

[0006] The utility model provides a horizontal test surface by arranging a test frame, so that the electrode to be tested is laid flat on the horizontal test surface, and at the same time, the electrode to be tested is tensioned and taut by a tensioning member, and the first side edge of the electrode in the length direction close to its fixed end and the position close to the reference edge are aligned with the reference straight line 2. The extension state of the electrode can be judged by observing the coincidence of the first side edge in the length direction of the electrode with the intersection of the reference straight line 1 and the reference straight line 2: if the first side edge in the length direction of the electrode coincides with the intersection of the reference straight line 1 and the reference straight line 2, it means that the extension of the foil is consistent with the extension of the coating area; if the first side edge in the length direction of the electrode deviates from the intersection of the reference straight line 1 and the reference straight line 2, it means that the extension of the coating area is greater than the extension of the foil; if the first side edge in the length direction of the electrode covers the intersection of the reference straight line 1 and the reference straight line 2, it means that the extension of the foil is greater than the extension of the coating area.

[0007] As a further improvement to the above-mentioned solution of the present invention, a third reference line is provided on the horizontal test surface near the end of the second reference line away from the reference edge. The third reference line intersects the second reference line at right angles and is aligned with the fixed end of the electrode. The provision of the third reference line facilitates adjustment of the alignment between the fixed end of the electrode and the second reference line.

[0008] As a further improvement of the above solution of the present invention, a tape is pasted on the horizontal test surface, and one end of the electrode is fixed to the horizontal test surface by the tape.

[0009] As a further improvement of the above solution of the present invention, the pole piece extension testing device further includes an adjusting member for driving the pole piece to move, and the adjusting member is installed at the reference edge position.

[0010] As a further improvement to the above-mentioned solution of the present invention, the adjustment member includes a guide rod, a support roller, and an adjustment unit. The guide rod is fixed to the test frame at both ends and is perpendicular to reference line two. The support roller is slidably mounted on the guide rod and driven by the adjustment unit to slide on the guide rod. The other end of the pole piece extends vertically downward across the support roller. The support roller is driven by the adjustment unit to slide on the guide rod, thereby moving the pole piece mounted thereon so that the edge of the pole piece is aligned with reference line two.

[0011] As a further improvement of the above solution of the present invention, the top surface of the support roller and the horizontal test surface are in the same horizontal plane, ensuring that the pole piece strip will not float away from the test board or be scratched by the corners of the test board.

[0012] As a further improvement to the above-mentioned solution of the present invention, the adjustment unit includes a screw and a handwheel. Both ends of the screw are rotatably mounted on the test frame, and the screw is threadedly connected to two shift forks. The two shift forks are respectively fixedly connected to the two ends of the support roller, and the handwheel is fixedly connected to one end of the screw. With this arrangement, when the handwheel is turned, the screw rotates, causing the two shift forks to move, thereby causing the support roller to slide on the guide rod, thereby causing the pole piece on the support roller to move.

[0013] As a further improvement of the above-mentioned scheme of the present invention, two relatively arranged fixed plates are fixed on the test stand at the reference edge position, the two fixed plates are directly provided with connecting plates and the two ends of the connecting plates are respectively fixed to the two fixed plates, the two ends of the guide rod are respectively fixedly connected to the two fixed plates, and the two ends of the screw rod are respectively rotatably connected to the two fixed plates through bearings.

[0014] As a further improvement of the above solution of the present invention, the tensioning member includes a fixing clamp and a weight. The fixing clamp is clamped at the other end of the pole piece, and the weight is connected to the fixing clamp via a rope.

[0015] As a further improvement of the above solution of the present invention, the test stand includes a test board and multiple supporting legs. The test board is arranged horizontally and its top surface forms a horizontal test surface. The multiple supporting legs are connected to the bottom of the test board to support the test board.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model provides a horizontal test surface by setting up a test frame, so that the electrode to be tested is laid flat on the horizontal test surface, and at the same time, the electrode to be tested is tensioned and taut by a tensioning member, and the first side edge of the electrode in the length direction close to its fixed end and the position close to the reference edge are aligned with the reference straight line 2. By observing the coincidence of the first side edge in the length direction of the electrode and the intersection of the reference straight line 1 and the reference straight line 2, the extension state of the electrode can be judged: if the first side edge in the length direction of the electrode coincides with the intersection of the reference straight line 1 and the reference straight line 2, it means that the extension of the foil is consistent with the extension of the coating area; if the first side edge in the length direction of the electrode deviates from the intersection of the reference straight line 1 and the reference straight line 2, it means that the extension of the coating area is greater than the extension of the foil; if the first side edge in the length direction of the electrode covers the intersection of the reference straight line 1 and the reference straight line 2, it means that the extension of the foil is greater than the extension of the coating area. The utility model has a simple structure, convenient and efficient operation, and can quickly test the extension state of the electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a pole piece extension testing device proposed in an embodiment of the present utility model;

[0019] Figure 2A schematic structural diagram of an adjusting member in a pole piece extension testing device proposed in an embodiment of the present utility model;

[0020] Figure 3 This is a working principle diagram of a pole piece extension testing device proposed in an embodiment of the present utility model.

[0021] Figure numerals: 100, pole piece; 200, test plate; 210, horizontal test surface; 211, scale; 212, reference line two; 213, reference line three; 214, tape; 220, support leg; 300, tensioner; 310, fixing clamp; 320, weight; 400, adjustment member; 410, guide rod; 420, support roller; 430, screw rod; 440, handwheel; 450, shift fork; 460, fixing plate; 470, connecting plate; 480, bearing. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to facilitate a more thorough and comprehensive understanding of the disclosure of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0024] In view of the lack of such tools in the current electrode production, the inability to test the electrode extension state, the inability to provide guidance data for existing production, resulting in low production yield and inability to improve efficiency, this embodiment provides a electrode extension measurement device. Figure 1 A pole piece extension test device of this embodiment includes a test frame and a tensioning member 300, and may also include an adjusting member 400.

[0025] The test stand is used to provide a horizontal test surface 210 for placing the electrode 100. In this embodiment, the test stand includes a test board 200 and four support legs 220. The test board 200 is arranged horizontally and its top surface forms a horizontal test surface 210. In this embodiment, the test board 200 is a rectangular plate body, and the horizontal test surface 210 is also rectangular. The four support legs 220 are respectively connected to the four corners of the bottom of the test board 200 to keep the test board 200 horizontal. In order to facilitate the movement of the test device, rollers can also be installed at the bottom of each support leg 220. Reference straight line one, reference straight line two 212 and reference straight line three 213 are engraved on the test board 200. Reference straight line one and reference straight line three 213 are both arranged along the width direction of the test board 200, and reference straight line one and reference straight line three 213 are arranged in parallel and spaced apart. In this embodiment, reference line 1 is set in the middle position of the test board 200. To facilitate the test of the extended state of the electrode 100, a scale 211 can be fixed at the position of reference line 1. The zero scale line of scale 211 is located at the intersection of reference line 1 and reference line 2 212. One side of the zero scale line of scale 211 is the positive scale part, and the other side of the zero scale line of scale 211 is the negative scale part. Reference line 2 212 is arranged along the length direction of the test board 200 and its length is equal to the length of the test board 200. That is, the two ends of reference line 212 extend to the two end edges of the length direction of the test board 200 respectively. Reference line 2 212 intersects reference line 1 and reference line 3 213 perpendicularly. In this embodiment, a tape 214 is attached to the horizontal test surface 210 at the position of reference line 3 213.

[0026] The tensioning member 300 is used to tension the pole piece 100 during testing. In this embodiment, the tensioning member 300 includes a fixing clamp 310 and a weight 320. The weight 320 is connected to the fixing clamp 310 via a rope. The specific use of the tensioning member 300 will be described later in conjunction with the testing of the pole piece 100.

[0027] The adjusting member 400 is fixed to one end edge of the horizontal test surface 210 in the longitudinal direction. In this embodiment, for the convenience of description, the one end edge of the horizontal test surface 210 to which the adjusting member 400 is fixed is defined as the reference edge. Figure 2The adjusting member 400 includes a guide rod 410, a support roller 420, an adjusting unit, two fixed plates 460, and a connecting plate 470. The two fixed plates 460 are arranged parallel to each other and fixed to the test plate 200. The connecting plate 470 is disposed between the two fixed plates 460 and connected to the two fixed plates 460 at both ends. The guide rod 410 is disposed between the two fixed plates 460, with both ends of the guide rod 410 fixedly connected to the two fixed plates 460 and having a smooth surface. The support roller 420 is slidably mounted on the guide rod 410, and the top surface of the support roller 420 is in the same horizontal plane as the horizontal test surface 210. The adjustment unit is used to drive the support roller 420 to slide on the guide rod 410. The adjustment unit includes a screw rod 430 and a handwheel 440. The screw rod 430 is arranged between two fixed plates 460 and parallel to the guide rod 410. The ends of the screw rod 430 are rotatably connected to the two fixed plates 460 via bearings 480. Two shift forks 450 are threadedly connected to the screw rod 430, and the two shift forks 450 are respectively fixedly connected to the ends of the support roller 420. The handwheel 440 is fixedly connected to one end of the screw rod 430. With this arrangement, when the handwheel 440 is turned, the screw rod 430 rotates, causing the two shift forks 450 to move, thereby causing the support roller 420 to slide on the guide rod 410.

[0028] Next, combine Figure 3 The testing principle of this embodiment is described.

[0029] Take the electrode piece 100 after stretching and with the same foil width as the coating width, align one end of the electrode piece 100 with the reference line 3 213 and align the first side edge of the electrode piece 100 in the length direction with the reference line 212, and use tape 214 to stick the end of the electrode piece 100 on the horizontal test surface 210;

[0030] Then, the electrode piece 100 is laid flat along the direction of the second reference line 212 and the other end of the electrode piece 100 is extended downward after crossing the support roller 420 so that the electrode piece 100 covers the positive scale portion of the scale 211. The top surface of the support roller 420 and the horizontal test surface 210 are in the same horizontal plane to ensure that the electrode piece 100 strip does not float away from the test board 200 or is scratched by the corners of the test board 200.

[0031] The fixing clamp 310 is clamped on the other end of the electrode 100. The electrode 100 is kept taut under the action of the weight 320. At this time, the force point of the electrode 100 is at the boundary between the coating and the foil. Then, the support roller 420 is driven to slide on the guide rod 410 by turning the hand wheel 440, so that the first side edge of the length direction of the electrode 100 near the support roller 420 is aligned with the reference line 212. The extension state of the electrode 100 is judged by observing the overlap between the first side edge of the length direction of the foil of the electrode 100 and the zero scale line position of the scale 211:

[0032] A. If the first side edge of the electrode 100 foil in the longitudinal direction coincides with the zero scale line of the scale 211, that is, the first side edge of the electrode 100 foil in the longitudinal direction coincides with the second reference line 212, it indicates that the extension of the foil is consistent with the extension of the coating area;

[0033] B. If the first side edge of the electrode 100 in the foil length direction is located on the positive scale portion of the scale 211, the first side edge of the electrode 100 in the foil length direction does not coincide with the second reference line 212, that is, the electrode 100 deviates from the second reference line 212, indicating that the coating area extension is greater than the foil extension;

[0034] C. If the first side edge of the electrode 100 in the length direction of the foil is located on the positive and negative parts of the scale 211, the first side edge of the electrode 100 in the length direction of the foil does not coincide with the second reference line 212, that is, the electrode 100 covers the second reference line 212, indicating that the extension of the foil is greater than the extension of the coating area.

[0035] D. The difference between the extension of the foil and the extension of the coating area can also be determined by the distance the foil deviates from the zero mark of the scale 211. At the same time, the weight of the weight 320 can be adjusted to meet different requirements for different foils.

[0036] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component. When a component is considered to be "fixed to" another component, it may be directly fixed to the other component or there may be a central component.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A pole piece extension test device for testing the extension state of a pole piece (100), characterized in that: The invention comprises a test frame and a tensioning member (300), wherein the test frame has a horizontal test surface (210), and one side edge of the horizontal test surface (210) is a reference edge. The horizontal test surface (210) is provided with a reference straight line 1 and a reference straight line 2 (212) extending from the reference edge to the inside thereof and perpendicularly intersecting the reference straight line 1; one end of the pole piece (100) is fixed on the horizontal test surface (210), and the other end of the pole piece (100) extends vertically downward across the reference edge, and both ends of the reference straight line 2 (212) are aligned with one side of the length direction of the pole piece (100); The tensioning member (300) is fixed to the other end of the pole piece (100) to tension the pole piece (100).

2. The pole piece extension test device according to claim 1, characterized in that: A reference straight line three (213) is provided on the horizontal test surface (210) at an end position close to the reference straight line two (212) away from the reference edge, and the reference straight line three (213) intersects the reference straight line two (212) perpendicularly and is aligned with the fixed end of the pole piece (100).

3. The pole piece extension testing device according to claim 1, characterized in that: A scale (211) is provided on the horizontal test surface (210), one side of the scale (211) is aligned with the reference straight line 1, and the zero scale line of the scale (211) coincides with the intersection point of the reference straight line 1 and the reference straight line 2 (212), one side of the zero scale line of the scale (211) is a positive scale portion, and the other side of the zero scale line of the scale (211) is a negative scale portion.

4. The pole piece extension testing device according to claim 1, characterized in that: An adhesive tape (214) is adhered to the horizontal test surface (210), and one end of the electrode (100) is fixed to the horizontal test surface (210) via the adhesive tape (214).

5. The pole piece extension testing device according to claim 1, characterized in that: The pole piece extension testing device further comprises an adjusting member (400) for driving the pole piece (100) to move, and the adjusting member (400) is installed at the reference edge position.

6. The pole piece extension testing device according to claim 5, characterized in that: The adjusting member (400) comprises a guide rod (410), a support roller (420) and an adjusting unit. Both ends of the guide rod (410) are fixed on the test frame and the guide rod (410) is perpendicular to the second reference line (212). The support roller (420) is slidably mounted on the guide rod (410) and driven by the adjusting unit to slide on the guide rod (410). The top surface of the support roller (420) and the horizontal test surface (210) are in the same horizontal plane. The other end of the pole piece (100) crosses the support roller (420) and extends vertically downward.

7. The pole piece extension testing device according to claim 6, characterized in that: The adjustment unit comprises a screw rod (430) and a hand wheel (440), both ends of the screw rod (430) are rotatably mounted on the test frame, and two shift forks (450) are threadedly connected to the screw rod (430), the two shift forks (450) are respectively fixedly connected to the two ends of the support roller (420), and the hand wheel (440) is fixedly connected to one end of the screw rod (430).

8. The pole piece extension testing device according to claim 6, characterized in that: The adjusting member (400) further includes two fixing plates (460) and a connecting plate (470), the two fixing plates (460) are arranged opposite to each other and both fixing plates (460) are fixed on the test frame, the connecting plate (470) is located on the two fixing plates (460), and the connecting plate (470) is directly provided with the connecting plate (470), and the two ends of the connecting plate (470) are respectively fixed to the two fixing plates (460), the two ends of the guide rod (410) are respectively fixedly connected to the two fixing plates (460), and the two ends of the screw rod (430) are respectively rotatably connected to the two fixing plates (460) through bearings (480).

9. The pole piece extension testing device according to claim 1, characterized in that: The tensioning member (300) comprises a fixing clamp (310) and a weight (320), wherein the fixing clamp (310) is clamped on the other end of the pole piece (100), and the weight (320) is connected to the fixing clamp (310) via a rope.

10. The pole piece extension testing device according to claim 1, characterized in that: The test stand comprises a test plate (200) and a plurality of support legs (220). The test plate (200) is arranged horizontally and its top surface forms a horizontal test surface (210). The plurality of support legs (220) are all connected to the bottom of the test plate (200) to support the test plate (200).

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