Pole group centering detection device

Abstract

The utility model discloses a pole group centering detection device, which comprises a pole group fixing support, a micrometer caliper and a datum plate, wherein the pole group fixing support is used for fixing a pole group to be detected after core combination; the micrometer caliper is mounted on the pole group fixing support and is used for measuring the side surface of the pole group to be detected after core combination; and the datum plate is mounted on the pole group fixing support and is used for zeroing the micrometer caliper. According to the invention, the centering degree of the pole group can be accurately measured.

Description

Technical Field

[0001] The utility model relates to the technical field of pole group detection devices, in particular to a pole group alignment detection device. Background Art

[0002] In the lithium-ion battery production process, the wound electrode assembly undergoes preheating, hot pressing, and X-raying. The connecting tabs are then ultrasonically welded, followed by laser welding of the battery cover. Finally, the core is assembled, wrapped in Mylar film, and then placed into the battery case for press assembly. The offset of the electrode assembly relative to the battery cover in both the length and width directions after the assembly is called the electrode assembly centering.

[0003] The pole group alignment is affected by the relative position of the tab and the connecting piece during ultrasonic welding, the relative position of the connecting piece and the battery cover during laser welding, and the alignment of the pole group during core assembly. Problems in any of the processes will cause the pole group alignment to be unqualified.

[0004] Poor electrode assembly alignment can impact the Mylar wrapping process and the subsequent shell insertion and press-fitting steps. Excessive electrode assembly alignment can cause the Mylar wrap to shift or fail to wrap, leading to poor Mylar meltability. Furthermore, the electrode assembly can be easily scratched during shell insertion, making it difficult to align the battery cover and shell during press-fitting. Even if alignment is achieved, the electrode assembly and cover inside the battery will remain misaligned, potentially causing tab tearing and other issues.

[0005] Therefore, the measurement and inspection of the electrode group alignment is the key to ensuring the quality and yield of normal battery production.

[0006] In existing battery production processes, there is no suitable solution for measuring electrode assembly centering. Measurement is typically performed visually or using a square ruler. These methods suffer from inaccurate and poor measurement accuracy. Therefore, a new electrode assembly centering detection device is needed to accurately and precisely measure electrode assembly centering. Utility Model Content

[0007] In view of the problems pointed out in the background art that the existing pole group centering detection scheme has inaccurate measurement and poor measurement accuracy, the utility model provides a pole group centering detection device, thereby accurately and highly precisely measuring the pole group centering.

[0008] To achieve the above purpose, the technical solutions provided by the present invention are as follows:

[0009] A device for detecting the centering degree of a pole group comprises a pole group fixing bracket for fixing the pole group after the core is closed to be tested, a screw micrometer installed on the pole group fixing bracket for measuring the side surface of the pole group after the core is closed to be tested, and a reference plate installed on the pole group fixing bracket for zeroing the screw micrometer.

[0010] Among them, the electrode group fixing bracket includes a base plate, and two adjacent sides of the upper end surface of the base plate are provided with L-shaped fixing frames extending upward, and a long-side movable splint with an adjustable position is provided at a position opposite to the long side of the L-shaped fixing frame, and a short-side movable splint with an adjustable position is provided at a position opposite to the short side of the L-shaped fixing frame. The L-shaped fixing frame, the long-side movable splint, and the short-side movable splint form a structure with an adjustable size for fixing the electrode group battery cover plate after the core to be tested is closed.

[0011] The upper end surface of the base plate is provided with a first horizontal sliding limit groove and a second longitudinal sliding limit groove, the lower end of the short side movable splint is provided with a first sliding block slidably connected to the first sliding limit groove, and the lower end of the long side movable splint is provided with a second sliding block slidably connected to the second sliding limit groove, and screw holes are respectively provided on the short side movable splint and the long side movable splint, and positioning screws are provided in the screw holes, and the bottom plate is tightened by rotating the positioning screws to fix the positions of the short side movable splint and the long side movable splint and the bottom plate.

[0012] Wherein, the first sliding block and the second sliding block are both dovetail blocks, and correspondingly, the first sliding limiting groove and the second sliding limiting groove are both dovetail grooves.

[0013] The reference plates include a long side reference plate provided on a long side of the L-shaped fixing frame and a short side reference plate provided on a short side of the L-shaped fixing frame.

[0014] Wherein, longitudinal support rods are respectively provided at both ends and the bending part of the L-shaped fixing frame, and the two support rods at the position opposite to the long side of the L-shaped fixing frame are provided with long side adjustable rods that can be adjusted up and down, and the long side adjustable rods are provided with a first screw micrometer, and the two support rods at the position opposite to the short side of the L-shaped fixing frame are provided with short side adjustable rods that can be adjusted up and down, and the short side adjustable rods are provided with a second screw micrometer.

[0015] Among them, the first micrometer and the second micrometer both include a test plate, a micrometer body and a sliding ring; the test plate is installed at the detection head of the micrometer body, and the bottom of the test plate is connected to the sliding ring, and the sliding rings of the first micrometer and the second micrometer are respectively slidably connected to the long-side adjustable rod and the short-side adjustable rod.

[0016] Wherein, second U-shaped guide rail blocks are provided at both ends of the long-side adjustable rod, and first longitudinal guide rails slidably connected to the second U-shaped guide rail blocks are provided on the support rods at corresponding positions.

[0017] Wherein, first U-shaped guide rail blocks are provided at both ends of the short-side adjustable rod, and second longitudinal guide rails slidably connected to the first U-shaped guide rail blocks are provided on the support rods at corresponding positions.

[0018] The upper ends of the three support rods are connected to an L-shaped upper end connecting frame through fixing screws.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] This application can achieve accurate and precise measurement of pole group alignment.

[0021] In addition, the adjustable long-side movable clamping plate and short-side movable clamping plate enable the present application to adapt to various models and sizes of the tested core rear electrode group, and the positioning screws can ensure that the position of the tested core rear electrode group is fixed during the test process.

[0022] In addition, the first micrometer and the second micrometer can respectively move horizontally on the long-side adjustable rod and the short-side adjustable rod, and the long-side adjustable rod and the short-side adjustable rod can respectively move vertically, so that measurement of any position on the side of the pole group can be achieved. At the same time, two micrometers corresponding to the long side and short side of the pole group can be set to achieve simultaneous measurement, thereby improving measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A first schematic diagram of the structure of a pole group alignment detection device provided in an embodiment of the present application;

[0024] In the figure, fixing screw 1, upper end connecting frame 2, first micrometer screw 3, long side adjustable rod 4, pole group fixing bracket 5, long side reference plate 6, first sliding limit groove 7, short side movable clamping plate 8, long side movable clamping plate 9, second sliding limit groove 10, short side reference plate 11, short side adjustable rod 12, second micrometer screw 13;

[0025] Figure 2 A schematic diagram of the structure of the electrode group fixing bracket provided in an embodiment of the present application;

[0026] In the figure, a first longitudinal guide rail 14 and a second longitudinal guide rail 15;

[0027] Figure 3 A schematic structural diagram of a short-side movable splint provided in an embodiment of the present application;

[0028] In the figure, the first sliding block 16;

[0029] Figure 4 A schematic diagram of the structure of the long side movable splint provided in an embodiment of the present application;

[0030] In the figure, the second sliding block 18;

[0031] Figure 5 A schematic diagram of the structure of the short-side adjustable rod provided in an embodiment of the present application;

[0032] In the figure, the first U-shaped guide rail block 17;

[0033] Figure 6 A schematic diagram of the structure of the long-side adjustable rod provided in an embodiment of the present application;

[0034] In the figure, the second U-shaped guide rail block 19;

[0035] Figure 7 A schematic structural diagram of a first micrometer screw and a second micrometer screw provided in an embodiment of the present application;

[0036] In the figure, the test plate 301, the micrometer screw body 302, and the sliding collar 303;

[0037] Figure 8 A schematic diagram of a first state of a pole group detected by the pole group alignment detection device of the present application;

[0038] In the figure, the back electrode group 20 of the core to be tested;

[0039] Figure 9 This is a schematic diagram of the second state of the pole group detected by the pole group alignment detection device of the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood broadly. For example, they can refer to fixed connection or set, detachable connection or set, or integral connection or set, and can refer to direct connection or indirect connection. Those skilled in the art can understand the specific meanings of the above terms in this patent based on specific circumstances.

[0043] like Figures 1-9 The figure shows the structure of the embodiment provided by the present utility model.

[0044] Example 1

[0045] This embodiment provides a pole group alignment detection device, including a pole group fixing bracket 5 for fixing the pole group 20 after the core is closed to be tested, a screw micrometer installed on the pole group fixing bracket 5 for measuring the side of the pole group 20 after the core is closed to be tested, and a reference plate installed on the pole group fixing bracket 5 for zeroing the screw micrometer.

[0046] The above solution provides a device for detecting electrode assembly centering. The electrode assembly fixing bracket 5 can be used to secure the length and width of the battery cover of the electrode assembly 20 after the cores are assembled, thereby fixing the position of the electrode assembly 20 after the cores are assembled. A reference plate is provided to zero the micrometer screw using the side of the battery cover as a reference. The micrometer screw is then moved to the measurement position, rotated to contact the end face of the electrode assembly, and the reading is taken. The reading on the other end face is then measured to calculate the electrode assembly centering. This device provides high measurement precision and accuracy.

[0047] It should be noted that the electrode group 20 after the core is tested includes a battery cover and an electrode group connected thereto. During testing, the battery cover of the electrode group after the core is tested is placed downward on the upper end surface of the bottom plate.

[0048] Example 2

[0049] This embodiment is an improvement on Example 1. This embodiment provides a specific structure of a pole group fixing bracket 5, comprising a base plate, with L-shaped fixing brackets extending upwardly disposed on two adjacent sides of the upper end surface of the base plate. An adjustable long-side movable clamping plate 9 is disposed opposite the long side of the L-shaped fixing bracket, and an adjustable short-side movable clamping plate 8 is disposed opposite the short side of the L-shaped fixing bracket. The L-shaped fixing bracket, long-side movable clamping plate 9, and short-side movable clamping plate 8 form an adjustable structure for securing the battery cover of the pole group 20 after the cells are assembled and tested.

[0050] This structure can be used to detect the centering degree of pole groups of various models and sizes.

[0051] Example 3

[0052] This embodiment provides a base plate structure based on the above embodiment, wherein the upper end surface of the base plate is provided with a first transverse sliding limit groove 7 and a second longitudinal sliding limit groove 10, the lower end of the short side movable splint 8 is provided with a first sliding block 16 that is slidably connected to the first sliding limit groove 7, and the lower end of the long side movable splint 9 is provided with a second sliding block 18 that is slidably connected to the second sliding limit groove 10, the short side movable splint 8 and the long side movable splint 9 are respectively provided with screw holes, and positioning screws are provided in the screw holes, which are used to rotate and tighten the base plate to fix the positions of the short side movable splint 8 and the long side movable splint 9 and the base plate.

[0053] The above structure can realize smooth position adjustment of the short side movable clamping plate 8 and the long side movable clamping plate 9, and can be fixed after adjustment, thereby facilitating the fixation of the battery cover plate of the electrode group after the core is tested.

[0054] Preferably, the first sliding block 16 and the second sliding block 18 are both dovetail blocks, and correspondingly, the first sliding limiting groove 7 and the second sliding limiting groove 10 are both dovetail grooves. With this structure, a longitudinal limiting function is achieved.

[0055] Example 4

[0056] Based on the above embodiment, this embodiment provides a reference plate structure comprising a long-side reference plate 6 disposed on the long side of the L-shaped fixture and a short-side reference plate 11 disposed on the short side of the L-shaped fixture. This reference plate can implement the zeroing function of the micrometer screw, ensuring the accuracy of test data.

[0057] Correspondingly, in this embodiment, longitudinal support rods are respectively provided at both ends and the bending portion of the L-shaped fixing frame, and the two support rods at the positions opposite to the long sides of the L-shaped fixing frame are provided with long side adjustable rods 4 that can be adjusted up and down, and the long side adjustable rods 4 are provided with a first micrometer screw 3, and the two support rods at the positions opposite to the short sides of the L-shaped fixing frame are provided with short side adjustable rods 12 that can be adjusted up and down, and the short side adjustable rods 12 are provided with a second micrometer screw 13.

[0058] By utilizing this structure, the two side end faces of the electrode group can be measured simultaneously, thereby improving the measurement efficiency.

[0059] In addition, the upper ends of the three support rods are connected to an L-shaped upper end connecting frame 2 by fixing screws 1. This structure can improve the stability of the support rods.

[0060] Preferably, in this embodiment, an improved structure of a threaded side micrometer is also adopted. Specifically, the first micrometer 3 and the second micrometer 13 each include a test plate 301, a micrometer body 302 and a sliding ring 303; the test plate 301 is installed at the detection head of the micrometer body 302, and a sliding ring 303 is connected to the bottom thereof, and the sliding rings 303 of the first micrometer 3 and the second micrometer 13 are slidably connected to the long-side adjustable rod 4 and the short-side adjustable rod 12 respectively.

[0061] It should be noted that the micrometer screw body 302 is purchased from outside and adopts existing technology. Therefore, its structure and implementation principle will not be described in detail.

[0062] It should be noted that, by utilizing the improved screw micrometer structure, a test plate is added to the detection head of the micrometer to facilitate fitting the pole group measurement data. At the same time, a sliding ring 303 is added at the bottom to cooperate with the adjustable rod to achieve horizontal movement.

[0063] Example 5

[0064] Based on the above embodiment, this embodiment provides specific structures of the long-side adjustable rod and the short-side adjustable rod, wherein the long-side adjustable rod 4 is provided with a second U-shaped guide block 19 at both ends, and the support rod at the corresponding position is provided with a first longitudinal guide rail 14 that is slidably connected to the second U-shaped guide block 19. The short-side adjustable rod 12 is provided with a first U-shaped guide block 17 at both ends, and the support rod at the corresponding position is provided with a second longitudinal guide rail 15 that is slidably connected to the first U-shaped guide block 17.

[0065] It should be noted that the above structure can realize the movement of the long-side adjustable rod and the short-side adjustable rod in the vertical direction. In addition, it should be noted that there is a certain friction between the guide rail block and the guide rail, so that the height position can only be adjusted when external force is applied, and the position will not change under the action of its own gravity.

[0066] In addition, the components that come into contact with the battery, such as the L-shaped fixing frame, the long-side movable splint 9, the short-side movable splint 8, the bottom plate, the test plate, etc., are made of non-metallic composite materials, such as plastic materials such as Peek, and the remaining components are made of stainless steel, which can effectively prevent scratches and other defects on the battery cover and electrode group.

[0067] When assembling the present application, the micrometer screw is loaded on the adjustable rod through the sliding collar, the adjustable rod is assembled on the corresponding guide rail through the guide rail block, and then the L-shaped upper end connecting frame is installed and tightened with the positioning screw.

[0068] During the test, the battery cover of the electrode group to be tested is placed downward on the upper plane of the bottom plate, so that the battery cover is close to the right angle position of the L-shaped fixing frame, and the long side movable splint and the short side movable splint are pushed to be close to the battery cover respectively, and then the position of the splint is fixed with fixing screws. The battery cover is fixed by the structure surrounded by the L-shaped fixing frame, the long side movable splint, and the short side movable splint. Then the micrometer is opened and moved to the corresponding reference plate, so that the test plate is close to the reference plate surface, and the zero button is pressed. Finally, the micrometer is moved to the position to be tested, and the knob is rotated to make the test plate close to the side of the electrode group. The data is read. After measuring a certain number of data on the two sides in turn, the other two sides of the electrode group are replaced for measurement. Data collection requires collecting data from four sides. After collecting the data, the absolute value of the data corresponding to the two sides is divided by 2 to obtain the centering value of the long side or short side of the electrode group. It should be noted that the calculation method is a well-known technology, and this application does not involve innovation of the method.

[0069] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A pole group alignment detection device, characterized in that: It comprises a pole group fixing bracket (5) for fixing the pole group (20) after the core is closed to be measured, a micrometer screw mounted on the pole group fixing bracket (5) for measuring the side of the pole group (20) after the core is closed to be measured, and a reference plate mounted on the pole group fixing bracket (5) for zeroing the micrometer screw; The electrode group fixing bracket (5) comprises a bottom plate, and two adjacent sides of the upper end surface of the bottom plate are provided with L-shaped fixing brackets extending upward, and a long side movable clamping plate (9) with adjustable position is provided at a position opposite to the long side of the L-shaped fixing bracket, and a short side movable clamping plate (8) with adjustable position is provided at a position opposite to the short side of the L-shaped fixing bracket. The L-shaped fixing bracket, the long side movable clamping plate (9), and the short side movable clamping plate (8) form a structure with adjustable size for fixing the battery cover plate of the electrode group (20) to be tested after the core is closed; The two ends and the bending part of the L-shaped fixing frame are respectively provided with longitudinal support rods, the two support rods at positions opposite to the long sides of the L-shaped fixing frame are provided with long side adjustable rods (4) that can be adjusted up and down, and the long side adjustable rods (4) are provided with first micrometer screws (3), and the two support rods at positions opposite to the short sides of the L-shaped fixing frame are provided with short side adjustable rods (12) that can be adjusted up and down, and the short side adjustable rods (12) are provided with second micrometer screws (13); The first micrometer screw (3) and the second micrometer screw (13) both comprise a test plate (301), a micrometer screw body (302), and a sliding collar (303); the test plate (301) is installed at the detection head of the micrometer screw body (302), and the bottom of the test plate (301) is connected to the sliding collar (303); the sliding collar (303) of the first micrometer screw (3) and the second micrometer screw (13) are respectively slidably connected to the long-side adjustable rod (4) and the short-side adjustable rod (12).

2. A pole group alignment detection device according to claim 1, characterized in that: The upper surface of the bottom plate is provided with a first transverse sliding limit groove (7) and a second longitudinal sliding limit groove (10); the lower end of the short side moving splint (8) is provided with a first sliding block (16) slidingly connected to the first sliding limit groove (7); the lower end of the long side moving splint (9) is provided with a second sliding block (18) slidingly connected to the second sliding limit groove (10); screw holes are respectively provided on the short side moving splint (8) and the long side moving splint (9); positioning screws are provided in the screw holes, and the bottom plate is tightened by rotating the positioning screws to fix the positions of the short side moving splint (8) and the long side moving splint (9) and the bottom plate.

3. The pole group alignment detection device according to claim 2, characterized in that: The first sliding block (16) and the second sliding block (18) are both dovetail blocks, and correspondingly, the first sliding limiting groove (7) and the second sliding limiting groove (10) are both dovetail grooves.

4. The pole group alignment detection device according to claim 1, characterized in that: The reference plate comprises a long side reference plate (6) arranged on the long side of the L-shaped fixing frame and a short side reference plate (11) arranged on the short side of the L-shaped fixing frame.

5. The pole group alignment detection device according to claim 1, characterized in that: Second U-shaped guide rail blocks (19) are provided at both ends of the long-side adjustable rod (4), and first longitudinal guide rails (14) are provided on the support rods at corresponding positions and are slidably connected to the second U-shaped guide rail blocks (19).

6. The pole group alignment detection device according to claim 1, characterized in that: The two ends of the short-side adjustable rod (12) are provided with first U-shaped guide rail blocks (17), and the support rods at corresponding positions are provided with second longitudinal guide rails (15) that are slidably connected to the first U-shaped guide rail blocks (17).

7. The pole group alignment detection device according to claim 1, characterized in that: The upper ends of the three support rods are connected to an L-shaped upper end connecting frame (2) via fixing screws (1).

Images