Device for testing voltage and internal resistance of cylindrical battery

Abstract

The utility model discloses a voltage internal resistance testing device of a cylindrical battery, which is characterized by comprising a bottom plate and a vertical frame vertically arranged on the bottom plate, the vertical frame is provided with a base capable of vertically moving downwards, the base is provided with two probes which are vertically arranged downwards, and the probes are arranged on the bottom plate. The probe comprises a guide sleeve fixedly connected with the base, a telescopic needle is telescopically arranged in the guide sleeve, and a reset spring is arranged between the inner end of the telescopic needle and the guide sleeve; and the telescopic needle is electrically connected to a voltage internal resistance tester through a wire. The device has the advantages of reasonable structure, convenience in operation and use, stable contact pressure, good test consistency and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production detection, in particular to a voltage internal resistance testing device for a cylindrical battery. Background Art

[0002] At present, with the rapid development of the new energy industry, society has further improved the energy density, safety performance, and fast charging requirements of lithium-ion batteries. As a highly recognized solution, large cylindrical batteries have ushered in a broad market space. At present, when testing the voltage internal resistance of large cylindrical batteries, voltage internal resistance testers and built-in test leads are usually used to test them. During manual testing, the test values ​​vary greatly, the accuracy is poor, and the reproducibility of the test results is low due to the influence of contact pressure. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is: how to provide a voltage internal resistance testing device with reasonable structure, convenient operation and use, stable contact pressure and good test consistency.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A voltage internal resistance test device for a cylindrical battery, characterized in that it comprises a bottom plate and a stand vertically arranged on the bottom plate, the stand being provided with a base that can move vertically downward, the base being provided with two probes that are vertically arranged downward, the probe comprising a guide sleeve fixedly connected to the base, a telescopic needle being telescopically arranged in the guide sleeve, a reset spring being arranged between the inner end of the telescopic needle and the guide sleeve; the telescopic needle is electrically connected to a voltage internal resistance tester through a wire.

[0006] With the above structure, the cylindrical battery is placed vertically on the bottom plate, the two probes are aligned with the positive electrode area and the negative electrode area respectively, the base is moved downward, and the two probes are pressed on the battery, and then the voltage internal resistance tester can be used for testing. Since the probe includes a guide sleeve and a telescopic needle, for batteries with different height differences between the positive and negative electrodes, the telescopic needles of the two probes can be adaptively retracted, thereby ensuring that both probes can make good contact with the corresponding electrodes. For batteries of the same model, the distance that the two probes retract each time remains unchanged, which can ensure that the contact pressure of the same model of cylindrical batteries is similar and the test consistency is good.

[0007] Furthermore, one end of the guide sleeve has a limiting boss protruding radially, and the other end has an external thread; the base has a vertically through-set mounting hole, the guide sleeve passes through the mounting hole, and is fixed to the base by a nut fitted on the external thread.

[0008] Further, at least one of the mounting holes is a strip-shaped hole, and the strip-shaped hole extends along the direction of the connection line of the two probes.

[0009] In this way, the probes can move positions in the strip-shaped holes, so as to adjust the distance between the two probes to meet the detection requirements of cylindrical batteries with different diameters.

[0010] Further, the bottom plate is provided with a first guiding groove arranged horizontally and a second guiding groove arranged longitudinally, and the extension lines of the first guiding groove and the second guiding groove intersect directly below the base; two first limiting blocks are slidably arranged on the first guiding groove, and a second limiting block is slidably arranged on the second guiding groove.

[0011] In this way, the left and right sides of the cylindrical battery can be limited by adjusting the two first limiting blocks, and the front side of the cylindrical battery can be limited by the second limiting block, so that the cylindrical battery can be placed at the detection position more quickly.

[0012] Further, both the first guiding groove and the second guiding groove penetrate through the bottom plate, and the bottom of the bottom plate is provided with two horizontally threaded rods that are coaxially connected and have opposite helix directions. The two horizontally threaded rods have the same length and are arranged along the first guiding groove, and the two first limiting blocks are respectively connected to the nuts of the two horizontally threaded rods; the bottom of the bottom plate is further provided with a longitudinal threaded rod arranged along the second guiding groove, and the second limiting block is connected to the nut of the longitudinal threaded rod.

[0013] In this way, by rotating the horizontally threaded rod and the longitudinal threaded rod, the first limiting block and the second limiting block can be respectively adjusted. Since the helix directions of the two horizontally threaded rods are opposite, the two first limiting blocks will also move synchronously in opposite directions.

[0014] Further, handles are arranged at one ends of the horizontally threaded rod and the longitudinal threaded rod.

[0015] Further, a cylinder is arranged vertically downward on the vertical frame, and the base is installed on the telescopic rod of the cylinder.

[0016] In summary, the utility model has the advantages of reasonable structure, convenient operation and use, stable contact pressure, and good test consistency. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the embodiment.

[0018] Figure 2 It is Figure 1 The enlarged schematic diagram of the dashed part in

[0019] Figure 3 It is a schematic diagram of the structure of the probe.

[0020] Figure 4 It is a schematic cross-sectional structure diagram of a probe. Specific implementation mode

[0021] The following further elaborates on the present utility model in conjunction with embodiments.

[0022] During specific implementation: As Figure 1 and Figure 2 shown, a voltage and internal resistance testing device for a cylindrical battery includes a bottom plate 1 and a vertical frame 2 provided on the bottom plate 1. The frame 2 is provided with a cylinder 5 vertically downward. A base 3 is installed on the telescopic rod of the cylinder 5. The base 3 is provided with two probes 4 vertically downward. As Figure 4 shown, the probe 4 includes a guide sleeve 41 fixedly connected to the base 3. A telescopic needle 42 is telescopically arranged in the guide sleeve 41. A return spring 43 is arranged between the inner end of the telescopic needle 42 and the guide sleeve 41; the telescopic needle 42 is electrically connected to a voltage and internal resistance tester through a wire. As Figure 3 shown, the lower end of the guide sleeve 41 has a limiting boss protruding radially, and the upper end has an external thread; the base 3 is provided with an installation hole vertically penetrating. The guide sleeve 41 passes through the installation hole and is fixed on the base 3 by a nut fitted on the external thread. As Figure 2 shown, one of the installation holes is a strip-shaped hole, and the strip-shaped hole extends along the connection line direction of the two probes 4.

[0023] As Figure 1 shown, the bottom plate 1 is provided with a horizontally arranged first guide groove 11 and a vertically arranged second guide groove 12. The extension lines of the first guide groove 11 and the second guide groove 12 intersect directly below the base 3; Two first limit blocks 13 are slidably arranged on the first guide groove 11, and a second limit block 14 is slidably arranged on the second guide groove 12. Both the first guide groove 11 and the second guide groove 12 penetrate the bottom plate 1. The bottom of the bottom plate 1 has two horizontally arranged screws coaxially connected and with opposite helix directions. The lengths of the two horizontally arranged screws are equal and are arranged along the first guide groove 11. The two first limit blocks 13 are respectively connected to the nuts of the two horizontally arranged screws; The bottom of the bottom plate 1 also has a vertically arranged screw along the second guide groove 12. The second limit block 14 is connected to the nut of the vertically arranged screw. One end of each of the horizontally arranged screw and the vertically arranged screw is provided with a handle. The horizontally arranged screw and the vertically arranged screw are arranged offset in the vertical direction to avoid mutual interference.

[0024] When using the voltage and internal resistance testing device of this embodiment, before testing, first adjust the positions of the first limit block and the second limit block. For the battery model to be tested, arbitrarily select one battery of this model and place it vertically under the substrate. Rotate the horizontal lead screw through the handle to move the two first limit blocks until they contact the cylindrical battery; adjust the front and back positions of the cylindrical battery so that the two probes are aligned with the positive and negative regions of the battery. Rotate the vertical lead screw through the handle to adjust the second limit block to contact the cylindrical battery. Thus, the adjustment of the first limit block and the second limit block is completed. For cylindrical batteries of the same model, the positions of the batteries can be located by using the first limit block and the second limit block, so as to facilitate rapid testing. Specifically, when implementing, for cylindrical batteries of different heights, the proximity switch or Hall sensor can be used to detect the extension length of the cylinder, and the pneumatic control system can be used to control the extension length of the cylinder to meet the testing requirements of cylindrical batteries of different heights.

[0025] The above are only the preferred embodiments of the present invention and do not limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A voltage internal resistance test device for a cylindrical battery, characterized in that: The invention comprises a bottom plate (1) and a stand (2) vertically arranged on the bottom plate (1); a base (3) which can move vertically downward is arranged on the stand (2); two probes (4) which are vertically arranged downward are provided on the base (3); the probes (4) comprise a guide sleeve (41) fixedly connected to the base (3); a telescopic needle (42) is telescopically arranged in the guide sleeve (41); a return spring (43) is arranged between the inner end of the telescopic needle (42) and the guide sleeve (41); and the telescopic needle (42) is electrically connected to a voltage internal resistance tester via a wire.

2. The voltage internal resistance test device of a cylindrical battery as claimed in claim 1, characterized in that: One end of the guide sleeve (41) has a limiting boss formed by radially protruding, and the other end has an external thread; the base (3) has a mounting hole arranged vertically through, the guide sleeve (41) passes through the mounting hole, and is fixed to the base (3) by a nut matched with the external thread.

3. The voltage internal resistance test device of a cylindrical battery as claimed in claim 2, characterized in that: At least one of the mounting holes is a strip-shaped hole, and the strip-shaped hole is extended along the direction of the connection line of the two probes (4).

4. The voltage internal resistance test device of a cylindrical battery as claimed in claim 1, characterized in that: The bottom plate (1) is provided with a first guide groove (11) arranged transversely and a second guide groove (12) arranged longitudinally, and an extension line of the first guide groove (11) and an extension line of the second guide groove (12) intersect directly below the base (3); two first limit blocks (13) are slidably provided on the first guide groove (11), and a second limit block (14) is slidably provided on the second guide groove (12).

5. The voltage internal resistance test device of a cylindrical battery as claimed in claim 4, characterized in that: The first guide groove (11) and the second guide groove (12) both penetrate the base plate (1); the base plate (1) has two coaxially connected horizontal screws with opposite rotation directions at the bottom; the two horizontal screws are of equal length and are arranged along the first guide groove (11); the two first limit blocks (13) are respectively connected to the nuts of the two horizontal screws; the base plate (1) also has a longitudinal screw arranged along the second guide groove (12); the second limit block (14) is connected to the nut of the longitudinal screw.

6. The voltage internal resistance test device of a cylindrical battery as claimed in claim 5, characterized in that: One end of the horizontal screw rod and the longitudinal screw rod is provided with a handle.

7. The voltage internal resistance test device of a cylindrical battery as claimed in claim 1, characterized in that: The stand (2) has a cylinder (5) arranged vertically downward, and the base (3) is mounted on a telescopic rod of the cylinder (5).

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