A tooling for measuring the internal resistance of a cylindrical or square battery.

Abstract

This invention provides a fixture for measuring the internal resistance of cylindrical or square batteries. It includes a housing and, sequentially arranged within the housing, a first drive assembly, a bracket, a lifting platform, and a second drive assembly. The first drive assembly is connected to the bracket, and drives the bracket to move laterally closer to the battery under test on the lifting platform. The lifting platform is used to raise and lower the battery under test so that the battery's terminals and corresponding two probes are on the same horizontal plane. The telescopic end of the second drive assembly is close to the lifting platform, and the other end is mounted on the side wall of the housing. This fixture for measuring the internal resistance of cylindrical or square batteries can adjust the vertical and horizontal positions of the bracket and the height of the lifting platform according to the battery's shape, size, and terminal position, aligning the probes with the positive and negative terminals of the battery under test. This enables the measurement of the internal resistance of batteries of various sizes and models, greatly expanding the application range of the fixture.

Description

Technical Field

[0001] This utility model belongs to the field of battery resistance detection technology, and in particular relates to a tooling for measuring the internal resistance of cylindrical or square batteries. Background Technology

[0002] In today's energy sector, lithium-ion and sodium-ion batteries have been widely used in electric vehicles, electric bicycles, power tools, energy storage systems, and many other fields due to their advantages such as high specific energy, long cycle life, safety, and environmental friendliness. These batteries usually exist as single cells, but since the energy of a single cell is limited, in order to meet the demand for large capacity and high power in practical applications, multiple batteries are often connected in series and parallel to form battery packs.

[0003] However, the performance of a battery pack is not simply determined by the linear sum of the performance of its individual cells, but rather exhibits the "barrel effect," meaning the overall performance of the battery pack is limited by the worst-performing individual cell. Therefore, to ensure excellent performance of the battery pack, the performance of the individual cells must be at a similar level. This requires that each cell be rigorously sorted before being connected in series or parallel to form a pack, selecting cells whose capacity, voltage, internal resistance, and other key parameters are within acceptable ranges for combination.

[0004] In the battery sorting process, capacity parameters can generally be measured during the battery formation stage, while voltage and internal resistance parameters require other specialized measurement methods. Currently, in the battery assembly production process, two methods are commonly used to measure voltage and internal resistance: one is manual handheld probe measurement, which, although simple, has significant drawbacks. It not only wastes a lot of manpower but also has low measurement efficiency, making it difficult to meet the needs of large-scale production; the other is using a sorting machine of a fixed size and model. Although this method has relatively high measurement efficiency, when facing experiments or changing to other battery types, the fixed nature of the sorting machine cannot flexibly adapt to the measurement needs of different battery sizes and models, thus leading to measurement failures. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model aims to propose a tooling for measuring the voltage and internal resistance of cylindrical or square batteries. This tooling can solve the problem of measuring the voltage and internal resistance of cylindrical or square batteries of various sizes and models, while reducing the labor intensity of production personnel holding probes. It meets the high-efficiency and flexible requirements for battery voltage and internal resistance measurement in the battery production process, provides strong support for the accurate sorting of batteries, and thus ensures the performance stability of battery packs.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] A fixture for measuring the internal resistance of a cylindrical or square battery includes a housing and a drive assembly I, a bracket, a lifting platform, and a drive assembly II, which are sequentially arranged within the housing. The drive assembly I is connected to the bracket for limiting the battery under test and drives the bracket to move horizontally towards the battery under test on the lifting platform. The lifting platform is used to lift the battery under test so that the terminal of the battery under test is on the same horizontal plane as the two corresponding probes. The telescopic end of the drive assembly II is close to the lifting platform, and the other end is installed on the side wall of the housing.

[0008] When the terminals of the battery to be tested are located on both sides of the battery, one probe is mounted on the bracket, and the height of this probe on the bracket is adjustable; the other probe is mounted on the second drive assembly, and the position of this probe on the second drive assembly is adjustable.

[0009] When the terminal of the battery to be tested is located on one side of the battery, both probes are mounted on the second drive assembly, and the position of the probes on the second drive assembly is adjustable.

[0010] Furthermore, the drive assembly includes a lead screw, a handle, and a slide rail. The handle is mounted on one end of the lead screw and is rotatably mounted on the side wall of the housing. The lead screw nut is mounted on the other end. The lead screw nut is connected to the lower part of the bracket. The bottom of the bracket is slidably mounted on the slide rail, and the slide rail is mounted on the bottom of the housing.

[0011] Furthermore, the bottom of the bracket is provided with a sliding groove that matches the slide rail.

[0012] Furthermore, the height of the bracket is adjustable; the bracket includes a bracket body, a mounting base, studs, and a limiting nut. The mounting base is provided on the side of the bracket body near the lifting platform. The two ends of the mounting base are slidably connected to two studs respectively. The two studs are respectively installed on both sides of the bracket body, and each stud is provided with a limiting nut for adjusting the height of the mounting base and limiting its position.

[0013] Furthermore, the bracket body is provided with a vertical waist-shaped hole 2 for fixing the mounting base 1.

[0014] Furthermore, when a probe is installed on the bracket, the bracket body is provided with a vertical waist-shaped hole for installing the probe, and the mounting base is an L-shaped plate with an L-shaped hole for installing the probe.

[0015] Furthermore, the lifting platform includes a base plate, a scissor lift frame, and a positioning plate. The base plate is mounted on the housing, the scissor lift frame is mounted on the base plate, and the positioning plate is mounted on the top of the scissor lift frame.

[0016] Furthermore, the positioning plate is provided with a limiting groove one for limiting the cylindrical battery to be tested and a limiting groove two for guiding the horizontal part of the mounting base one.

[0017] Furthermore, the second drive assembly includes a cylinder, a second mounting base, and a cylinder bracket. The fixed end of the cylinder is mounted on the side wall of the housing, the telescopic end is mounted on the second mounting base, and the bottom is mounted on the bottom of the housing via the cylinder bracket. The second mounting base is provided with a longitudinal waist-shaped hole along its longitudinal direction for adjusting the position of the probe.

[0018] Furthermore, both probes are electrically connected to an external voltage and internal resistance meter.

[0019] Compared with existing technologies, the tooling for measuring the internal resistance of cylindrical or square batteries described in this utility model has the following advantages:

[0020] (1) The tooling for measuring the internal resistance of cylindrical or square batteries described in this utility model can be flexibly adjusted according to the shape (cylindrical or square) and size of the battery. By adjusting the up, down, left and right positions of the bracket and the height of the lifting platform, the probe can be aligned with the positive and negative terminals of the battery to be tested, thereby realizing the measurement of the internal resistance of batteries of various sizes and models. This greatly expands the application range of the tooling, enabling it to meet the diverse and personalized measurement needs in the battery production process, and effectively solves the limitations of existing measurement methods when facing different batteries.

[0021] (2) The fixture for measuring the internal resistance of cylindrical or square batteries described in this utility model can measure batteries with terminals on both sides or the same side. For batteries with terminals on both sides, the fixture can accurately align probe one and probe two with the terminals on both sides of the battery by adjusting the left and right positions of the bracket and the height of the lifting platform, ensuring the accuracy of the measurement. For batteries with terminals on the same side, simply remove probe two, install probe three on the drive assembly two, and adjust the distance between probe two and probe three to correspond to the spacing between the battery terminals. This fixture can seamlessly switch between measuring batteries with different terminal layouts without the need to purchase additional special equipment or make complex modifications, greatly improving the versatility and practicality of the fixture and reducing the equipment and management costs for enterprises. Attached Figure Description

[0022] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0024] Figure 2A schematic diagram of the support structure provided for an embodiment of this utility model;

[0025] Figure 3 A schematic diagram of the stud structure provided in an embodiment of this utility model;

[0026] Figure 4 A schematic diagram of the lifting platform structure provided in this embodiment of the utility model;

[0027] Figure 5 A schematic diagram of the scissor lift structure provided in this embodiment of the utility model;

[0028] Figure 6 This is a schematic diagram of the overall structure of Example 2.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Housing; 2. Drive assembly one; 21. Lead screw; 22. Handle; 23. Slide rail; 3. Bracket; 31. Bracket body; 311. Vertical oblong hole one; 312. Vertical oblong hole two; 32. Mounting seat one; 33. Stud; 34. Limit nut; 4. Lifting platform; 41. Base plate; 42. Scissor lift frame; 421. Horizontal shaft one; 422. Adjusting rod; 423. Scissor arm one; 424. Scissor arm two; 425. Horizontal shaft two; 426. Horizontal shaft three; 43. Positioning plate; 431. Limit groove one; 432. Limit groove two; 5. Drive assembly two; 51. Cylinder; 52. Mounting seat two; 521. Longitudinal oblong hole; 53. Cylinder bracket; 54. Throttle valve; 55. Solenoid valve; 56. Pressure regulating valve; 6. Probe one; 7. Probe two; 8. Probe three. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] Example 1

[0036] like Figures 1 to 5 As shown, a fixture for measuring the internal resistance of a cylindrical or square battery includes a housing 1 and a drive assembly 2, a bracket 3, a lifting platform 4, and a drive assembly 5 arranged sequentially within the housing 1. The drive assembly 2 is connected to the bracket 3, which is used to limit the battery under test, and drives the bracket 3 to move laterally closer to the battery under test on the lifting platform 4. The lifting platform 4 is used to lift the battery under test so that the terminal of the battery under test is at the same horizontal plane as the probe at the telescopic end of the drive assembly 5. The telescopic end of the drive assembly 5 is close to the lifting platform 4 and drives the probe to move laterally to contact the terminal of the battery under test. The other end is mounted on the side wall of the housing 1.

[0037] The fixture for measuring the internal resistance of cylindrical or square batteries described in this utility model has a lifting platform 4 with a support 3 and a drive assembly 5 on both sides. By adjusting the height of the lifting platform 4, the terminal of the battery to be tested is made to be at the same horizontal plane as the probe on the drive assembly 5. By adjusting the height of the support 3, the support 3 is limited to the battery to be tested. When the probe is installed on the support 3, the height of the support 3 is adjusted to make the probe and the terminal of the battery to be tested at the same horizontal plane. By moving the drive assembly 5 laterally, the probe on it comes into contact with the terminal of the battery to be tested, thus realizing the measurement of the internal resistance of batteries of various sizes and models.

[0038] In a preferred embodiment of the present invention, the housing 1 includes a bottom plate and three side plates connected to the bottom plate, wherein a handle is installed on each of two opposite side plates.

[0039] In actual use, no baffles are provided on the top and front of the housing 1, making it easy for operators to operate. In battery production sites or laboratory environments, it is often necessary to adjust the position of the measuring fixture according to the production layout or experimental requirements. Handles are installed on the two opposite side plates of the housing 1, allowing operators to easily lift and move the fixture by holding the handles with both hands, without the need for additional handling tools or multiple people working together, greatly improving the efficiency and flexibility of fixture handling.

[0040] In a preferred embodiment of the present invention, the drive assembly 2 includes a lead screw 21, a handle 22, and a slide rail 23. The handle 22 is installed at one end of the lead screw 21 and is rotatably mounted on the side wall of the housing 1. The lead screw nut is installed at the other end. The lead screw nut is connected to the lower part of the bracket 3. The bottom of the bracket 3 is slidably mounted on the slide rail 23. The slide rail 23 is installed at the bottom of the housing 1.

[0041] In actual use, the handle 22 is a Phillips head handle, and the slide rail 23 is 200mm-300mm long. Rotating the handle 22 drives the lead screw 21 to rotate, causing the lead screw nut on the lead screw 21 to move the bracket 3 left and right along the slide rail 23, bringing the bracket 3 closer to the battery to be tested on the lifting platform 4, thus limiting the battery's movement. The slide rail 23 of the same specification provides stable guidance and support for the movement of the bracket 3, avoiding measurement errors caused by the bracket 3 shaking or shifting.

[0042] In a preferred embodiment of this utility model, the bracket 3 includes a bracket body 31, a mounting base 32, studs 33, and a limiting nut 34. The mounting base 32 is provided on the side of the bracket body 31 near the lifting platform 4. The two ends of the mounting base 32 are slidably connected to two studs 33 respectively. The two studs 33 are respectively installed on both sides of the bracket body 31, and each stud 33 is provided with a limiting nut 34 for adjusting the height of the mounting base 32 and limiting its position.

[0043] In practical use, the stud 33 and the limiting nut 34 work together to provide stable support for the movement and positioning of the mounting base 32. When adjusting the probe height, the mounting base 32 slides smoothly along the stud 33 without any shaking or jamming.

[0044] In a preferred embodiment of the present invention, the bracket body 31 is provided with a vertical waist-shaped hole 311 for mounting a probe and a vertical waist-shaped hole 312 for fixing a mounting base 32. The bottom of the bracket body 31 is provided with a sliding groove adapted to the slide rail 23. Both the slide rail 23 and the sliding groove are U-shaped structures.

[0045] The mounting base 32 is an L-shaped plate, and the mounting base 32 is provided with an L-shaped hole for mounting the probe.

[0046] In practical use, the lower part of the stud 33 is mounted on the base plate of the bracket body 31. Two nuts are threaded onto the lower part of the stud 33, located at the upper and lower ends of the base plate of the bracket body 31, respectively, facilitating the installation and removal of the stud 33. The contact area between the mounting base 32, the bracket body 31, and the probe is covered with an insulating plate. The mounting base 32 and the bracket body 31 are fixed by bolts passing through the vertical oblong hole 312. When the probe is installed on the bracket 3, the probe detection end is located on the side of the mounting base 32 closest to the lifting platform 4, and the other end passes through the L-shaped hole and the vertical oblong hole 311 before being fitted with a nut. By tightening the nut, the nut abuts against the bracket body 31, thereby fixing the probe.

[0047] When the probe position needs to be adjusted, adjust the position of the limit nut 34 on the stud 33, adjust the height of the mounting base 32 and the probe mounted on the mounting base 32, tighten the bolts on the mounting base 32 and the vertical oblong hole 312 and the nut on the probe. The vertical oblong hole 311 and the vertical oblong hole 312 guide the up and down movement of the probe and the mounting base 32 respectively.

[0048] In a preferred embodiment of the present invention, the lifting platform 4 includes a base plate 41, a scissor lift frame 42, and a positioning plate 43. The base plate 41 is mounted on the housing 1, the scissor lift frame 42 is mounted on the base plate 41, and the positioning plate 43 is mounted on the top of the scissor lift frame 42.

[0049] In actual use, the lifting height of the lifting platform 4 ranges from 45 to 150 mm. By adjusting the scissor lift frame 42, the positioning plate 43 can be moved vertically, thus allowing the battery placed on the positioning plate 43 to adapt to measurement needs at different heights.

[0050] In a preferred embodiment of the present invention, the scissor lift frame 42 includes two sets of symmetrically arranged telescopic units and adjusting rods 422. The middle parts of the two sets of telescopic units are hinged by two horizontal shafts 421. Both horizontal shafts 421 are threadedly connected to the adjusting rods 422. The thread directions of the adjusting rods 422 and the two horizontal shafts 421 are opposite.

[0051] Each telescopic unit includes two vertically arranged scissor arms 423 and 424, and two horizontal shafts 425 and 426. Both scissor arms 423 and 424 are X-shaped. The upper end of each of the two scissor arms 423 is slidably connected to the positioning plate 43 via the horizontal shaft 425, and the other end of each of the two scissor arms 424 is hinged to the positioning plate 43. The lower end of each of the two scissor arms 424 is slidably connected to the base plate 41 via the horizontal shaft 426, and the other end of each of the two scissor arms 424 is hinged to the base plate 41.

[0052] In actual use, the top surface of the base plate 41 is provided with a connecting plate for sliding connection with the second scissor arm 424, and the connecting plate is provided with an oblong hole for sliding the third horizontal axis 426; the bottom surface of the positioning plate 43 is provided with a connecting plate for sliding connection with the first scissor arm 423, and the connecting plate is provided with an oblong hole for sliding the second horizontal axis 425. By rotating the adjusting rod 422, the distance between the two first horizontal axes 421 is adjusted, thereby adjusting the height of the lifting platform 4 so that the terminal of the battery to be tested on the lifting platform 4 is at the same horizontal plane as the probe on the second drive assembly 5.

[0053] In a preferred embodiment of the present invention, the positioning plate 43 is provided with a limiting groove 431 for limiting the cylindrical battery to be tested and a limiting groove 432 for accommodating the horizontal part of the mounting base 32.

[0054] In actual use, by setting the limiting groove 431, the cylindrical battery to be tested is located within the limiting groove 431 and will not slide. By setting the limiting groove 432, when the drive component 2 moves the bracket 3 laterally, the horizontal part of the mounting base 32 aligns with the limiting groove 432 and moves along the limiting groove 432, so that the height of the mounting base 32 can be quickly adjusted.

[0055] In a preferred embodiment of this utility model, the second drive assembly 5 includes a cylinder 51, a second mounting base 52, a cylinder bracket 53, a throttle valve 54, a solenoid valve 55, and a pressure regulating valve 56. The fixed end of the cylinder 51 is mounted on the side wall of the housing 1, the telescopic end is mounted on the second mounting base 52, and the bottom is mounted on the bottom of the housing 1 through the cylinder bracket 53. The second mounting base 52 is provided with a longitudinal oblong hole 521 for adjusting the position of the probe along its longitudinal direction. The cylinder 51 is used in conjunction with the throttle valve 54, the solenoid valve 55, and the pressure regulating valve 56 for adjusting and controlling the gas.

[0056] In practical use, the position of the probe can be adjusted through the longitudinal oblong hole 521 so that the probe and the terminal of the battery under test are on the same center line; the cylinder 51 drives the probe to move laterally and contact the terminal of the battery under test. In this embodiment, the cylinder 51 is preferably a three-axis cylinder with cylinder diameters of 12mm, 16mm, and 20mm, and an adjustable stroke of 20-50mm. The throttle valve 54 is matched with the cylinder, the solenoid valve 55 is preferably a two-position five-way solenoid valve, and the pressure regulating valve 56 has a pressure regulating range of 0.05-0.9MPa.

[0057] In a preferred embodiment of this utility model, a probe 6 is mounted on the drive assembly 2 5, and a probe 7 is mounted on the bracket 3. Both probe 6 and probe 7 are electrically connected to an external voltage and internal resistance meter.

[0058] This embodiment is used to measure batteries with terminals on both sides. During use, the battery to be tested is placed on the lifting platform 4. The height of the lifting platform 4 is adjusted by rotating the adjusting rod 422 according to the height of the battery, so that the battery terminals and probe 6 are at the same horizontal level. The bracket 3 is moved by rotating the handle 22, so that the distance between probe 7 and probe 6 is 20-30mm greater than the length of the battery. The height of probe 7 is then adjusted by the bracket 3, so that probe 7 is at the same horizontal level as the battery terminals. Probe 6 is moved laterally by the cylinder 51, so that probe 6 and probe 7 contact the terminals on both sides of the battery. The internal resistance value of the battery is measured using a voltage internal resistance meter.

[0059] Specific implementation examples:

[0060] A cylindrical battery with terminals on both sides, a diameter of 34mm, and a length of 140mm, is measured. The battery is placed on a lifting platform 4, with the battery portion positioned within the limiting groove 431. The height of the lifting platform 4 is adjusted so that one terminal of the battery is level with probe 6. The height of mounting base 32 and probe 7 is adjusted by adjusting the height limiting nut 34, ensuring that probe 7 is at the same height as the other terminal of the battery. The left and right positions of the bracket 3 are adjusted by turning handle 22, so that the distance between probe 7 and probe 6 is 25mm greater than the battery length (140mm). The cylinder 51 is pushed out by the solenoid valve 55, causing probes 6 and 7 to contact the terminals on both sides of the battery. The internal resistance value of the battery is read from a voltage resistance meter connected to probes 6 and 7.

[0061] A square battery with terminals on both sides is measured. The battery is 25mm high, 260mm long (in the terminal direction), and 110mm wide. The battery is placed flat on a lifting platform 4. The height of the lifting platform 4 is adjusted so that one terminal of the battery is level with probe 6. The height of mounting base 32 and probe 7 is adjusted using the height limit nut 34 so that probe 7 is at the same height as the other terminal of the battery. The left and right positions of the bracket 3 are adjusted by turning handle 22 so that the distance between probe 7 and probe 6 is 25mm greater than the battery length (260mm). The cylinder 51 is pushed out by the solenoid valve 55, so that probe 6 and probe 7 contact the positive and negative terminals on both sides of the battery, respectively. The internal resistance value of the battery is read from a voltage resistance meter connected to probes 6 and 7.

[0062] Example 2

[0063] In a preferred embodiment of this utility model, the driving component 2 5 is equipped with probe 1 6 and probe 3 8. Probe 1 6 and probe 3 8 are arranged in parallel and are both electrically connected to an external voltage internal resistance meter. In this case, probe 2 7 is not installed on the bracket 3.

[0064] In practical use, such as Figure 6 As shown, probe 38 and probe 16 are both mounted on mounting base 2 52, and the nuts on probe 38 and probe 16 are tightened respectively, so that probe 38, probe 16 and the longitudinal waist-shaped hole 521 on both sides of mounting base 2 52 are locked together, and the contact area between mounting base 2 52 and probe 38 and probe 16 is covered with an insulating board.

[0065] This second embodiment is used to measure batteries with terminals on the same side. During use, the battery to be tested is placed on the lifting platform 4. The height of the lifting platform 4 is adjusted by rotating the adjusting rod 422 according to the height of the battery, so that the battery terminals are on the same horizontal plane as probes 6 and 8. The height limit nut 34 is adjusted so that the horizontal part of the mounting base 32 is aligned with the limit groove 432 on the positioning plate 43. The handle 22 is turned to adjust the left and right position of the bracket 3 so that the distance between the vertical part of the mounting base 32 and probe 6 is 25mm greater than the length of the battery. The positions of probes 6 and 8 on the mounting base 52 are adjusted so that they are aligned with the two terminals of the battery. Probes 6 and 8 are moved laterally by the cylinder 51 until they contact the terminals on the same side of the battery. The internal resistance value of the battery is measured using a voltage internal resistance meter.

[0066] Specific implementation examples:

[0067] A cylindrical battery with terminals on the same side, 40mm in diameter and 135mm in length, is measured. Probe 2 (7) is removed, and the battery is placed on the lifting platform 4. The height of the lifting platform 4 is adjusted so that the battery terminals to be tested are on the same horizontal plane as probes 1 (6) and 3 (8). The height limit nut 34 is adjusted so that the horizontal part of the mounting base 1 (32) aligns with the limit groove 2 (432) on the positioning plate 43. The handle 22 is turned to adjust the left and right position of the bracket 3 so that the distance between the vertical part of the mounting base 1 (32) and probe 1 (6) is 25mm greater than the battery length (135mm). The distance between probes 1 (6) and 3 (8) is adjusted according to the battery terminal spacing so that probes 1 (6) and 3 (8) are aligned with the two terminals of the battery to be tested. Probes 1 (6) and 3 (8) are moved laterally by cylinder 51 until they contact the terminals on the same side of the battery to be tested. The internal resistance value of the battery is measured using a voltage internal resistance meter.

[0068] A square battery with terminals on the same side is measured. The terminals are 200mm long, 44mm thick, and 120mm wide (in the terminal direction). The battery is placed on a lifting platform 4, and the height of the platform is adjusted so that the battery terminals and probes 6 and 8 are on the same horizontal plane. The height limit nut 34 is adjusted so that the horizontal part of the mounting base 32 is aligned with the limit groove 432 on the positioning plate 43. The handle 22 is turned to adjust the left and right position of the bracket 3 so that the distance between the vertical part of the mounting base 32 and probe 6 is 25mm greater than the battery length (200mm). The positions of probes 6 and 8 on the mounting base 52 are adjusted so that they are aligned with the two terminals of the battery. Probes 6 and 8 are moved laterally by cylinder 51 until they contact the terminals on the same side of the battery. The internal resistance value of the battery is measured using a voltage internal resistance meter.

[0069] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tooling for measuring the internal resistance of a cylindrical or square battery, characterized in that: The device includes a housing (1) and a drive assembly (2), a bracket (3), a lifting platform (4), and a drive assembly (5) arranged sequentially within the housing (1). The drive assembly (2) is connected to the bracket (3) for limiting the battery to be tested and drives the bracket (3) to move horizontally closer to the battery to be tested on the lifting platform (4). The lifting platform (4) is used to lift the battery to be tested so that the terminal post of the battery to be tested is on the same horizontal plane as the two corresponding probes. The telescopic end of the drive assembly (5) is close to the lifting platform (4), and the other end is installed on the side wall of the housing (1). When the terminals of the battery to be tested are located on both sides of the battery, one probe is installed on the bracket (3), and the height of the probe on the bracket (3) is adjustable. The other probe is installed on the drive assembly (5), and the position of the probe on the drive assembly (5) is adjustable. When the terminal of the battery to be tested is located on one side of the battery, both probes are mounted on the second drive assembly (5), and the position of the probes on the second drive assembly (5) is adjustable.

2. The fixture for measuring the internal resistance of a cylindrical or square battery according to claim 1, characterized in that: The drive assembly 1 (2) includes a lead screw (21), a handle (22) and a slide rail (23). The handle (22) is installed at one end of the lead screw (21) and is rotatably installed on the side wall of the housing (1). The lead screw nut is installed at the other end. The lead screw nut is connected to the lower part of the bracket (3). The bottom of the bracket (3) is slidably installed on the slide rail (23). The slide rail (23) is installed at the bottom of the housing (1).

3. The fixture for measuring the internal resistance of a cylindrical or square battery according to claim 2, characterized in that: The bottom of the bracket (3) is provided with a sliding groove that is compatible with the slide rail (23).

4. The fixture for measuring the internal resistance of a cylindrical or square battery according to claim 1, characterized in that: The height of the bracket (3) is adjustable; the bracket (3) includes a bracket body (31), a mounting base (32), studs (33) and a limiting nut (34). The mounting base (32) is provided on the side of the bracket body (31) near the lifting platform (4). The two ends of the mounting base (32) are slidably connected to two studs (33). The two studs (33) are respectively installed on both sides of the bracket body (31), and each stud (33) is provided with a limiting nut (34) for adjusting the height of the mounting base (32) and limiting it.

5. The fixture for measuring the internal resistance of a cylindrical or square battery according to claim 4, characterized in that: The bracket body (31) is provided with a vertical waist-shaped hole (312) for fixing the mounting base (32).

6. The fixture for measuring the internal resistance of a cylindrical or square battery according to claim 4, characterized in that: When a probe is installed on the bracket (3), the bracket body (31) is provided with a vertical waist-shaped hole (311) for installing the probe, and the mounting base (32) is an L-shaped plate with an L-shaped hole for installing the probe.

7. The fixture for measuring the internal resistance of a cylindrical or square battery according to claim 1, characterized in that: The lifting platform (4) includes a base plate (41), a scissor lift frame (42) and a positioning plate (43). The base plate (41) is installed on the housing (1). The scissor lift frame (42) is installed on the base plate (41). The positioning plate (43) is installed on the top of the scissor lift frame (42).

8. The fixture for measuring the internal resistance of a cylindrical or square battery according to claim 7, characterized in that: The positioning plate (43) is provided with a limiting groove 1 (431) for limiting the cylindrical battery to be tested and a limiting groove 2 (432) for accommodating the horizontal part of the mounting base 1 (32).

9. The fixture for measuring the internal resistance of a cylindrical or square battery according to claim 1, characterized in that: The second drive assembly (5) includes a cylinder (51), a second mounting base (52), and a cylinder bracket (53). The fixed end of the cylinder (51) is mounted on the side wall of the housing (1), the telescopic end is mounted on the second mounting base (52), and the bottom is mounted on the bottom of the housing (1) through the cylinder bracket (53). The second mounting base (52) has a longitudinal waist-shaped hole (521) for adjusting the position of the probe along its longitudinal direction.

10. The fixture for measuring the internal resistance of a cylindrical or square battery according to claim 1, characterized in that: Both probes are electrically connected to an external voltage and internal resistance meter.

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