Battery case screw detection tool

Abstract

The utility model discloses a battery case screw detection tool comprising a pedestal used for installing a product positioning module, a contact detection module and a detection module. The product positioning module is used for installing and positioning a to-be-detected product; the contact detection module is used for detecting whether screws are neglected to be installed on the to-be-detected product and comprises a plurality of groups of contact detection columns and a detection column displacement feedback assembly, the contact detection columns directly face to-be-detected screw holes in the to-be-detected product, and the diameters of the contact detection columns are smaller than those of the to-be-detected screw holes; the detection column displacement feedback assembly judges whether a screw is neglected to be installed in the to-be-detected screw hole at the position according to the maximum relative displacement of the contact detection column extending into the to-be-detected screw hole; and the driving module is arranged at one end of the product positioning module or the contact detection module. According to the utility model, whether the screw is neglected is detected automatically, so that the influence of human subjective factors is effectively avoided, and the detection accuracy and the detection efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery production and testing technology, and in particular to a tooling for testing battery casing screws. Background Technology

[0002] The global market demand for batteries in end-use electronic products is enormous, and the requirements for battery production quality are becoming increasingly stringent. All electronic products undergo various tests before leaving the factory to ensure stable battery quality. The battery casing provides physical protection and structural support for the internal battery cells, while also serving as electrical insulation and preventing the leakage of air and moisture. If screws on the battery casing are missing, it can easily cause the casing to wobble, affecting the overall structural strength and stability of the battery. The internal cells are also more susceptible to deterioration due to compression and oxidation, and may even experience electrolyte leakage, affecting the normal use of the battery. Therefore, checking for missing screws on the battery casing is particularly important.

[0003] Existing inspection methods often rely on manual visual inspection, which is inefficient and prone to missed or incorrect detections. This fails to effectively intercept products with loose or missing screws, significantly impacting battery quality stability. Therefore, there is an urgent need to design a dedicated inspection fixture for battery casing screws to avoid human error, improve inspection accuracy and efficiency, ensure stable battery quality throughout the production process, and further enhance battery yield and production efficiency. Summary of the Invention

[0004] The purpose of this utility model is to provide a tooling for inspecting battery casing screws, which solves the problems of low inspection efficiency and frequent missed or incorrect judgments that often occur when using manual visual inspection.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A tooling for inspecting battery casing screws, comprising:

[0007] The base is used to install the product positioning module, contact detection module, and contact detection module.

[0008] The product positioning module is used to install and position the product under test.

[0009] The contact detection module is used to detect whether a screw is missing on the product under test. It includes several sets of contact detection posts and a detection post displacement feedback component. The contact detection posts are directly facing the screw holes to be tested on the product under test and the diameter of the contact detection posts is smaller than the diameter of the screw holes to be tested. The detection post displacement feedback component determines whether a screw hole to be tested is missing at that position based on the maximum relative displacement of the contact detection posts extending into the screw holes to be tested.

[0010] The drive module is located at one end of the product positioning module or the contact detection module, and is used to drive one of the modules to move closer to or further away from the other module.

[0011] Furthermore, the detection column displacement feedback assembly includes a mounting plate, a first contact conductive copper block and a guide post fixed on the mounting plate, a sliding block slidably connected to the guide post, a second contact conductive copper block fixed on the sliding block and positioned opposite the first contact conductive copper block, and a spring sleeved on the guide post; wherein the two ends of the spring abut against the mounting plate and the sliding block respectively, and the contact detection column is fixed on the sliding block; when the spring is in its natural state, there is no contact between the first contact conductive copper block and the second contact conductive copper block;

[0012] The first and second contact conductive copper blocks are disposed on the feedback circuit, which is also provided with an indicator light. When the first and second contact conductive copper blocks are in contact, the indicator light is in the first state; when the first and second contact conductive copper blocks are not in contact, the indicator light is in the second state. The indicator light has different colors in the first and second states.

[0013] Furthermore, the first contact conductive copper block end face includes a central area and an edge area, and micro protrusions are provided on both the central area and the edge area, and the density of micro protrusions on the central area is greater than the density of micro protrusions on the edge area.

[0014] The indicator light is a tri-color light and also includes a third state; when the center area of ​​the first contact conductive copper block is in contact with the second contact conductive copper block, the indicator light is in the first state; when the edge area of ​​the first contact conductive copper block is in contact with the second contact conductive copper block, the indicator light is in the third state; when the first contact conductive copper block and the second contact conductive copper block are not in contact, the indicator light is in the second state; the indicator light has different colors in the first state, the second state and the third state.

[0015] Furthermore, the central region is a plane, the edge region is an arc surface, and the plane of the central region is tangent to the arc surface of the edge region.

[0016] Furthermore, it also includes a sliding positioning module, which includes a guide rail fixed on the base and a slide block slidably connected on the guide rail. The slide block is fixed to the output end of the drive module, and the product positioning module or contact detection module is installed on the slide block.

[0017] The base or guide rail is fixed with a limiting block to limit the maximum displacement of the slide.

[0018] Furthermore, the drive module includes a drive cylinder, and the output end of the drive cylinder is connected to the contact detection module;

[0019] The product positioning module is fixed on the base. The product positioning module is provided with a mounting slot. The mounting slot has a groove surface that matches at least part of the product under test, so that the mounting slot can support and position the product under test.

[0020] Furthermore, a protective cover located above the drive module is fixed on the base.

[0021] Furthermore, it also includes a start button for controlling the contact detection module and the start of the contact detection module, and an emergency stop button for controlling the contact detection module and the stop of the contact detection module;

[0022] A housing is located below the base.

[0023] Furthermore, handles are rotatably connected to both sides of the box; the base and the box are hinged on one side, and a buckle is provided on the other side between the base and the box.

[0024] Furthermore, the detection column displacement feedback component also includes a buzzer. When the first contact conductive copper block and the second contact conductive copper block are in contact, the buzzer does not work; when the first contact conductive copper block and the second contact conductive copper block are not in contact, the buzzer works and issues an alarm.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In this invention, a drive module induces a relative displacement between the product under test and the contact detection module. The detection column displacement feedback component determines whether a screw is missing from the screw hole at that location based on the maximum relative displacement of the contact detection column extending into the screw hole. If the maximum relative displacement is too large, it is determined that no screw is present in the screw hole, meaning a screw is missing. This invention automates the detection of missing screws, effectively avoiding the influence of subjective human factors and improving detection accuracy and efficiency.

[0027] In this invention, the maximum relative displacement of the contact detection post extending into the screw hole under test is converted into the contact status of the first and second conductive copper blocks, and further converted into the working state of the indicator light. Operators can intuitively determine whether a screw is missing from the product under test by observing the indicator light's working state. Specifically, when a screw is installed in the screw hole, the contact detection post will press against the screw head and compress its stroke backward, causing the first and second conductive copper blocks to come into contact with each other. At this time, their circuit loop is connected, and the indicator light is in the first state. When no screw is installed in the screw hole, the contact detection post will not compress its stroke, and the indicator light is in the second working state. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0030] Figure 1 This is a three-dimensional schematic diagram of the battery casing screw inspection fixture of this utility model;

[0031] Figure 2 This is a three-dimensional schematic diagram of the battery casing screw inspection fixture of this utility model with the protective cover removed.

[0032] Figure 3 This is a schematic diagram showing the connection of the drive module, sliding positioning module, and contact detection module of this utility model.

[0033] Figure 4 This is a schematic diagram of the contact detection module of this utility model during the detection of the contact detection module, wherein the mounting plate of the contact detection module is hidden.

[0034] Figure 5 This is a schematic diagram of the contact detection module of this utility model with the mounting plate hidden.

[0035] Figure 6 This is a top view of the contact detection module of this utility model.

[0036] Figure 7 This is a schematic diagram of the end face of the first contact conductive copper block of this utility model.

[0037] Figure 8 This is a schematic diagram of the first contact conductive copper block of this utility model.

[0038] Illustrations: 100, base; 110, housing; 111, handle; 112, buckle; 120, protective cover;

[0039] 200. Product positioning module;

[0040] 300. Contact detection module; 310. Contact detection column; 320. Detection column displacement feedback component; 321. Mounting plate; 322. Guide column; 323. First contact conductive copper block; 3231. Central area; 3232. Edge area; 324. Sliding block; 325. Second contact conductive copper block; 326. Spring; 327. Indicator light;

[0041] 400. Driver module;

[0042] 500. Sliding positioning module; 510. Guide rail; 520. Slide block; 530. Limit block;

[0043] 600. Product to be tested;

[0044] 710. Start button; 720. Emergency stop button. Detailed Implementation

[0045] To make the utility model's objectives, features, and advantages more apparent and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0046] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0047] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0048] Example 1:

[0049] This embodiment provides a battery casing screw inspection fixture for detecting whether battery casing screws are missing, combined with... Figures 1-2As shown, the battery casing screw inspection fixture includes a base 100, a product positioning module 200, a contact detection module 300, a drive module 400, and a sliding positioning module 500. The base 100 is used to mount the product positioning module 200, the contact detection module 300, the drive module 400, and the sliding positioning module 500.

[0050] The product positioning module 200 is used to install and position the product under test 600. Before checking whether any screws are missing from the product under test 600, the product under test 600 must first be installed onto the product positioning module 200. In this embodiment, the product positioning module 200 is fixed on the base 100. The product positioning module 200 is provided with a mounting groove for supporting and positioning the product under test 600. The mounting groove has a groove surface that at least partially matches the product under test 600, so that the mounting groove supports and positions the product under test 600. When installing and positioning the product under test 600, the product under test 600 is directly placed into the mounting groove. On the one hand, this is convenient to pick up and put down, which can reduce some additional clamping mechanisms or even eliminate the need for additional clamping mechanisms. On the other hand, the mounting groove has a groove surface that at least partially matches the product under test 600, which can prevent the product under test 600 from being placed backwards, thus affecting the test.

[0051] The contact detection module 300 is used to detect whether a screw is missing on the product under test 600. It includes several sets of contact detection posts 310 and a detection post displacement feedback component 320. The contact detection posts 310 are directly facing the screw holes to be tested on the product under test 600 and the diameter of the contact detection posts 310 is smaller than the diameter of the screw holes to be tested. The detection post displacement feedback component 320 determines whether a screw hole to be tested is missing a screw based on the maximum relative displacement of the contact detection posts 310 extending into the screw holes to be tested. When the maximum relative displacement is too large, it is determined that there is no screw in the screw hole to be tested, that is, a screw hole is missing a screw.

[0052] In this embodiment, combined with Figures 3-5As shown, the detection column displacement feedback assembly 320 of this utility model includes a mounting plate 321, a first contact conductive copper block 323 and a guide post 322 fixed on the mounting plate 321, a sliding block 324 slidably connected on the guide post 322, a second contact conductive copper block 325 fixed on the sliding block 324 and positioned opposite the first contact conductive copper block 323, and a spring 326 sleeved on the guide post 322; wherein the two ends of the spring 326 abut against the mounting plate 321 and the sliding block 324 respectively, and the spring 326 is used to reset the sliding block 324 and the second contact conductive copper block 325 after the product under test 600 is detected; the contact detection column 310 is fixed on the sliding block 324; when the spring 326 is in its natural state, the first contact conductive copper block 323 and the second contact conductive copper block 325 are not in contact. The first conductive copper block 323 and the second conductive copper block 325 are disposed on the feedback circuit, which is also equipped with an indicator light 327. When the first conductive copper block 323 and the second conductive copper block 325 are in contact, the indicator light 327 is in a first state; when the first conductive copper block 323 and the second conductive copper block 325 are not in contact, the indicator light 327 is in a second state. The indicator light 327 has different colors in the first and second states. In this embodiment, the indicator light 327 displays green in the first state and red in the second state. That is, the indicator light 327 displays green when a screw is detected and red when no screw is detected. When a screw is installed in the screw hole to be tested, the contact detection post 310 will push against the screw head and compress its stroke backward, and the first conductive copper block 323 and the second conductive copper block 325 will come into contact with each other. At this time, their circuit loop is connected, and the indicator light 327 is in the first state; when no screw is installed in the screw hole to be tested, the contact detection post 310 will not compress its stroke, and the indicator light 327 is in the second working state. In this invention, the maximum relative displacement of the contact detection column extending into the screw hole to be tested is converted into the contact status of the first and second conductive copper blocks, and further converted into the working status of the indicator light. Workers can intuitively determine whether a screw is missing from the product under test by observing the working status of the indicator light. The detection column displacement feedback component 320 also includes a buzzer. When the first conductive copper block 323 and the second conductive copper block 325 are in contact, the buzzer does not work; when the first conductive copper block 323 and the second conductive copper block 325 are not in contact, the buzzer works to issue an alarm, increasing the audible alarm to remind workers and avoiding delays that could affect overall work efficiency.

[0053] A drive module 400 is disposed at one end of the product positioning module 200 or the contact detection module 300, and is used to drive one of the product positioning module 200 and the contact detection module 300 to move closer to or farther away from the other module, that is, to drive the product positioning module 200 and the contact detection module 300 to move relatively closer to or farther away from each other. In this embodiment, combined with Figure 6 As shown, the drive module 400 includes a drive cylinder, and the output end of the drive cylinder is connected to the contact detection module 300. The drive cylinder drives the contact detection module 300 to move. When the product under test 600 needs to be detected, the output end of the drive cylinder drives the contact detection module 300 to move closer to the product under test 600. After the detection is completed, the output end of the drive cylinder drives the contact detection module 300 to move away from the product under test 600.

[0054] Combination Figure 6 As shown, the sliding positioning module 500 includes a guide rail 510 fixed on the base 100 and a slide block 520 slidably connected on the guide rail 510. The slide block 520 is fixed to the output end of the drive module 400, and the product positioning module 200 or the contact detection module 300 is mounted on the slide block 520. The guide rail 510 serves as a guide, and the slide block 520 moves along the guide rail 510. In this embodiment, one end of the slide block 520 is fixed to the output end of the drive module 400, and the other end is fixed to the mounting plate 321 on the contact detection module 300, that is, the contact detection module 300 is mounted on the slide block 520. A limiting block 530 is fixed on the base 100 or guide rail 510 to limit the maximum displacement of the slide 520. When the slide 520 moves to the limiting block 530, if there is no screw in the screw hole to be tested, the first contact conductive copper block 323 and the second contact conductive copper block 325 will not contact each other. The setting of the limiting block 530 avoids that even if there is no screw in the screw hole to be tested, the excessive displacement of the slide 520 will cause the first contact conductive copper block 323 and the second contact conductive copper block 325 to contact each other, thus affecting the test results.

[0055] The battery casing screw testing fixture of this utility model also includes a start button 710 for controlling the start of the contact detection module 300 and an emergency stop button 720 for controlling the stop of the contact detection module 300. After the product to be tested 600 is installed, pressing the start button 710 will start the test. In case of an emergency during the test, such as equipment failure, the emergency stop button 720 can be pressed to stop the equipment.

[0056] In addition, a protective cover 120 is fixed on the base 100 above the drive module 400 for protecting the drive module 400. A box body 110 is provided below the base 100. Circuits and other components can be arranged in the box body 110, such as gas pipelines supporting the drive cylinders. Since these are well-known to those skilled in the art, no further details will be provided here. That is, the box body 110 can function to accommodate other components. Handles 111 are rotatably connected to both sides of the box body 110, facilitating handling, and the rotatable connection also facilitates the storage of the handles 111. One side between the base 100 and the box body 110 is connected by hinge, and a buckle 112 is provided on the other side between the base 100 and the box body 110. That is, the base 100 acts as the lid of the box body 110 here, facilitating subsequent opening of the box body 110 to maintain and repair the components inside the box body 110.

[0057] Embodiment 2:

[0058] This embodiment provides a battery case screw detection tooling for detecting whether the battery case screws are missing and whether the screws are installed in place. As shown in combination with Figures 6-7 This embodiment is different from Embodiment 1 in that: the end face of the first contact conductive copper block 323 includes a central area 3231 and an edge area 3232. Micro-protrusions are provided on both the central area 3231 and the edge area 3232, and the density of the micro-protrusions on the central area 3231 is greater than that on the edge area 3232. The micro-protrusions on the central area 3231 and the edge area 3232 are formed by laser etching. When the central area 3231 of the first contact conductive copper block 323 contacts the second contact conductive copper block 325, due to the large density of the micro-protrusions on the central area 3231, the contact area between the central area 3231 and the second contact conductive copper block 325 is large, and the overall resistance value after the first contact conductive copper block 323 and the second contact conductive copper block 325 are connected is small; when the edge area 3232 of the first contact conductive copper block 323 contacts the second contact conductive copper block 325, due to the small density of the micro-protrusions on the edge area 3232, the contact area between the edge area 3232 and the second contact conductive copper block 325 is small, and the overall resistance value after the first contact conductive copper block 323 and the second contact conductive copper block 325 are connected is large. The indicator light 327 is a three-color light, which has three display states and can display three different colors respectively.

[0059] During the process of detecting the screw installation status on the battery casing using the battery casing screw detection fixture in this embodiment, when a screw is installed in the screw hole to be tested and the screw is installed in place, the contact detection post 310 will push against the screw head and compress the stroke backward. The first contact conductive copper block 323 and the second contact conductive copper block 325 will come into contact with each other. Since the screw in the screw hole to be tested is installed in place, the screw in the screw hole to be tested will not tilt or shake. The first contact conductive copper block 323 and the second contact conductive copper block 325 are both in a completely horizontal state. At this time, the central area 3231 of the first contact conductive copper block 323 is in contact with the second contact conductive copper block 325, and their circuit loop is connected. After the first contact conductive copper block 323 and the second contact conductive copper block 325 are connected, the overall resistance value is small, and the indicator light 327 is in the first state. In this embodiment, there is a gap between the sliding block 324 and the guide post 322, allowing the sliding block 324 to tilt slightly relative to the guide post 322. The guide post 322 is smaller than the screw hole size, further allowing it to tilt slightly relative to the screw hole. When a screw is installed in the screw hole to be tested, but not fully installed, the contact detection post 310 will press against the screw head and compress its stroke. The first contact conductive copper block 323 and the second contact conductive copper block 325 will then contact each other. Because the screw in the screw hole to be tested is not fully installed, it will tilt or wobble. The second contact conductive copper block 325 will also be tilted due to the tilt of the screw in the hole. At this time, the edge area 3233 of the first contact conductive copper block 323 contacts the second contact conductive copper block 325, connecting their circuit loops. Furthermore, the overall resistance value is high after the first and second contact conductive copper blocks 323 and 325 are connected, and the indicator light 327 is in the third state. When no screw is installed in the screw hole to be tested, the contact detection post 310 will not compress its stroke, the first contact conductive copper block 323 and the second contact conductive copper block 325 will not be in contact, and the indicator light 327 will be in the second working state. The indicator light 327 has different colors in the first, second, and third states. In this embodiment, the indicator light 327 displays green in the first state, red in the second state, and yellow in the third state. This embodiment includes a microcontroller for controlling the state of the indicator light 327 based on the overall resistance value of the first contact conductive copper block 323 and the second contact conductive copper block 325. Specifically, the microcontroller triggers the PWM modulation module through an internal threshold comparison mechanism to control the duty cycle of different colored carriers in the indicator light 327, thereby controlling the color of the indicator light 327.

[0060] In this embodiment, the central area 3231 is a plane, and the edge area 3232 is an arc surface, with the plane of the central area 3231 and the arc surface of the edge area 3232 being tangent. If the first contact conductive copper block 323 and the second contact conductive copper block 325 are relatively tilted when in contact, the arc surface design of the edge area 3232 amplifies the tilting behavior during contact through curvature geometric constraint mechanics, making the relative tilt more pronounced. Simultaneously, the tangency ensures a smooth transition during tilting. In addition to detecting whether a screw is missing, this embodiment can also detect whether the screw is installed correctly, facilitating further assessment of the screw installation by staff, enabling appropriate decisions and ultimately improving the installation quality of the battery casing.

[0061] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tooling for inspecting battery casing screws, characterized in that, include: The base (100) is used to install the product positioning module (200), the contact detection module (300), and the contact detection module (300). Product positioning module (200) is used to install and position the product under test (600). The contact detection module (300) is used to detect whether a screw is missing on the product under test (600). It includes several sets of contact detection posts (310) and a detection post displacement feedback component (320). The contact detection posts (310) are facing the screw hole to be tested on the product under test (600) and the diameter of the contact detection posts (310) is smaller than the diameter of the screw hole to be tested. The detection post displacement feedback component (320) determines whether a screw hole to be tested is missing a screw based on the maximum relative displacement of the contact detection posts (310) extending into the screw hole to be tested. A drive module (400) is disposed at one end of the product positioning module (200) or the contact detection module (300) and is used to drive one of the product positioning module (200) or the contact detection module (300) to move closer to or further away from the other module.

2. The battery casing screw inspection fixture according to claim 1, characterized in that, The detection column displacement feedback assembly (320) includes a mounting plate (321), a first contact conductive copper block (323) and a guide post (322) fixed on the mounting plate (321), a sliding block (324) slidably connected on the guide post (322), a second contact conductive copper block (325) fixed on the sliding block (324) and facing the first contact conductive copper block (323), and a spring (326) sleeved on the guide post (322); wherein the two ends of the spring (326) abut against the mounting plate (321) and the sliding block (324) respectively, and the contact detection column (310) is fixed on the sliding block (324); when the spring (326) is in its natural state, the first contact conductive copper block (323) and the second contact conductive copper block (325) do not contact each other; The first contact conductive copper block (323) and the second contact conductive copper block (325) are disposed on the feedback circuit, and the feedback circuit is also provided with an indicator light (327). When the first contact conductive copper block (323) and the second contact conductive copper block (325) are in contact, the indicator light (327) is in the first state; when the first contact conductive copper block (323) and the second contact conductive copper block (325) are not in contact, the indicator light (327) is in the second state. The indicator light (327) has different colors in the first state and the second state.

3. The battery casing screw inspection fixture according to claim 2, characterized in that: The first contact conductive copper block (323) end face includes a central area (3231) and an edge area (3232). Both the central area (3231) and the edge area (3232) are provided with micro protrusions, and the density of micro protrusions on the central area (3231) is greater than the density of micro protrusions on the edge area (3232). The indicator light (327) is a tri-color light and also includes a third state; when the central area (3231) of the first contact conductive copper block (323) is in contact with the second contact conductive copper block (325), the indicator light (327) is in the first state; when the edge area (3232) of the first contact conductive copper block (323) is in contact with the second contact conductive copper block (325), the indicator light (327) is in the third state; when the first contact conductive copper block (323) and the second contact conductive copper block (325) are not in contact, the indicator light (327) is in the second state; the indicator light (327) has different colors in the first state, the second state and the third state.

4. The battery casing screw inspection fixture according to claim 3, characterized in that: The central area (3231) is a plane, the edge area (3232) is an arc surface, and the plane of the central area (3231) is tangent to the arc surface of the edge area (3232).

5. The battery casing screw inspection fixture according to claim 1, characterized in that: It also includes a sliding positioning module (500), which includes a guide rail (510) fixed on the base (100) and a slide (520) slidably connected on the guide rail (510). The slide (520) is fixed to the output end of the drive module (400), and the product positioning module (200) or the contact detection module (300) is mounted on the slide (520). A limiting block (530) is fixed on the base (100) or guide rail (510) to limit the maximum displacement of the slide (520).

6. The battery casing screw inspection fixture according to claim 1, characterized in that: The drive module (400) includes a drive cylinder, and the output end of the drive cylinder is connected to the contact detection module (300); The product positioning module (200) is fixed on the base (100). The product positioning module (200) is provided with a mounting groove. The mounting groove has a groove surface that at least partially matches the product under test (600) so that the mounting groove can support and position the product under test (600).

7. The battery casing screw inspection fixture according to claim 6, characterized in that: A protective cover (120) located above the drive module (400) is fixed on the base (100).

8. The battery casing screw inspection fixture according to claim 1, characterized in that: It also includes a start button (710) for controlling the start of the contact detection module (300) and the contact detection module (300), and an emergency stop button (720) for controlling the stop of the contact detection module (300) and the contact detection module (300). A housing (110) is provided below the base (100).

9. The battery casing screw inspection fixture according to claim 8, characterized in that: The box (110) is rotatably connected to handles (111) on both sides; the base (100) and the box (110) are hinged on one side, and a buckle (112) is provided on the other side between the base (100) and the box (110).

10. The battery casing screw inspection fixture according to claim 2, characterized in that: The detection column displacement feedback component (320) also includes a buzzer. When the first contact conductive copper block (323) and the second contact conductive copper block (325) are in contact, the buzzer does not work; when the first contact conductive copper block (323) and the second contact conductive copper block (325) are not in contact, the buzzer works and issues an alarm.

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