A needle seat device of a cylindrical lithium ion battery voltage internal resistance sorting machine
The plug-in connector design solves the problem of cumbersome replacement of test connectors for cylindrical lithium-ion battery voltage resistance testing, enabling fast and reliable test connector replacement and efficient voltage resistance testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOWATT DONGGUAN
- Filing Date
- 2025-05-19
- Publication Date
- 2026-06-05
AI Technical Summary
The existing cylindrical lithium-ion battery voltage internal resistance test probe holder has a complex structure, the test probe replacement process is cumbersome, the debugging cycle is long, continuous operation is unstable, and the test accuracy does not meet the standards.
The needle holder device adopts a plug-in connection design, in which the test needle is plugged into the needle holder, the welding plate is fastened to the needle holder, and the bracket is detachably connected to the sorting machine test turntable. This simplifies the maintenance process, integrates the conductive path, adapts to different models of sorting machines, and reduces the cost of modification.
It enables rapid replacement and stable connection of test probes, improves work efficiency, reduces failure rate and equipment modification costs, and ensures test accuracy and stability.
Smart Images
Figure CN224328156U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of lithium-ion battery manufacturing, and more specifically, to a needle holder device for a cylindrical lithium-ion battery voltage internal resistance sorting machine. Background Technology
[0002] Lithium-ion batteries have been widely used due to their advantages such as high energy density, long cycle life, and no memory effect. In the manufacturing process of cylindrical lithium-ion batteries, voltage internal resistance testing is an important step, and voltage internal resistance sorting machines are usually used.
[0003] Traditional cylindrical lithium-ion battery voltage internal resistance test pin holders require the test pins to be soldered to the circuit board for fixation, and then screwed onto the pin holder. The soldering board is then fixed to the pin holder with screws, and the test pin position is adjusted via a U-shaped groove. This type of pin holder has a complex structure, many adjustment positions, a long debugging cycle, and is unstable during continuous operation, resulting in long test pin replacement times and substandard testing accuracy. Currently, there is a lack of a pin holder device that can quickly replace pins while providing reliable testing. Utility Model Content
[0004] The purpose of this invention is to provide a needle holder device for a cylindrical lithium-ion battery voltage internal resistance sorting machine, which aims to solve the problem of cumbersome test needle replacement process in the existing needle holder.
[0005] This invention is implemented as follows: a needle holder device for a cylindrical lithium-ion battery voltage internal resistance sorting machine includes two adjacent test needles, a needle holder, a voltage internal resistance meter, and a welding plate. The two test needles are respectively embedded in the needle holder, and the test needles and the needle holder are plugged and detached. The welding plate is fastened to the rear end of the needle holder, and the two test needles are electrically connected to the welding plate. The welding plate is electrically connected to the voltage internal resistance meter through a wire. A bracket is provided at the bottom of the needle holder, and the needle holder is plugged and detached from the bracket. The bracket is detachably connected to the sorting machine test turntable.
[0006] Furthermore, the needle holder has two needle position holes arranged side by side or parallel to each other. The needle position holes penetrate the needle holder laterally. One end of the test needle passes through the needle position hole and is exposed on the rear end of the needle holder, forming a welding section. The other end of the test needle is exposed on the front end of the needle holder, forming a test section.
[0007] Furthermore, the welding segment is electrically connected to the welding plate via a wire.
[0008] Furthermore, the outer periphery of the test needle is provided with a boss, which is arranged around the circumference of the test needle. A limiting groove is formed in the needle position hole. When the test needle passes through the needle position hole, the rear end face of the boss abuts against the inner sidewall of the limiting groove.
[0009] Furthermore, the front end face of the boss is flush with the front end face of the needle seat.
[0010] Furthermore, the welding plate and the test probe are arranged at intervals.
[0011] Furthermore, the bracket has an L-shaped structure, comprising a vertical plate and a horizontal plate, with the bottom of the vertical plate vertically abutting one end of the horizontal plate.
[0012] Furthermore, the needle holder has an embedded cavity with a bottom opening, the upper part of the vertical plate is embedded in the embedded cavity, and the upper outer periphery of the vertical plate abuts against the inner wall of the embedded cavity.
[0013] Furthermore, the bracket is provided with screw holes, and the bracket is fixed to the sorting machine test turntable by screws passing through the screw holes. The screw holes are located on the horizontal plate.
[0014] Furthermore, the rear end of the needle seat is concave inward to form an embedding groove, and the two sides of the embedding groove are provided with buckling blocks. The welding plate is installed in the embedding groove, and the buckling blocks abut against the two sides of the welding plate.
[0015] Compared with existing technologies ， This utility model provides a needle holder device for a cylindrical lithium-ion battery voltage internal resistance sorting machine. The plug-in connection design allows for quick assembly and disassembly of the test needle, needle holder, and support, significantly simplifying the maintenance process. The welded plate integrates conductive paths, reducing wire clutter and avoiding signal crosstalk. The detachable connection between the support and the turntable adapts to different sorting machine models, reducing equipment modification costs. The modified needle holder for the sorting machine's voltage internal resistance tester improves work efficiency, has a reliable structure, and allows for quick debugging and stable operation. This device integrates the test needle, welded plate, and needle holder into a single unit, improving efficiency, reducing failure rates, facilitating maintenance, and enabling rapid accuracy verification. It also solves the problem of cumbersome test needle replacement in traditional needle holder systems. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the needle holder device of a cylindrical lithium-ion battery voltage internal resistance sorting machine provided by this utility model;
[0017] Figure 2 This is a schematic diagram of the structure of the test probe provided by this utility model;
[0018] Figure 3 This is a cross-sectional structural diagram of the needle holder provided by this utility model;
[0019] Figure 4 This is a cross-sectional structural diagram of the bracket provided by this utility model.
[0020] In the figure: test pin 10, pin seat 20, voltage internal resistance meter 30, welding plate 40, bracket 50, test section 11, welding section 12, boss 13, pin position hole 21, limiting groove 22, inner cavity 23, embedding groove 24, vertical plate 51, horizontal plate 52, screw hole 53. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0022] The implementation of this utility model will be described in detail below with reference to specific embodiments.
[0023] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0024] Reference Figure 1-4 The image shown is a preferred embodiment of the present invention.
[0025] A needle holder device for a cylindrical lithium-ion battery voltage internal resistance sorting machine includes two adjacent test needles 10, a needle holder 20, a voltage internal resistance meter 30, and a welding plate 40. The two test needles 10 are respectively embedded in the needle holder 20, and the test needles 10 and the needle holder 20 are plugged and plugged together. The welding plate 40 is fastened to the rear end of the needle holder 20, and the two test needles 10 are electrically connected to the welding plate 40. The welding plate 40 is electrically connected to the voltage internal resistance meter 30 through a wire. A bracket 50 is provided at the bottom of the needle holder 20, and the needle holder 20 is plugged and plugged together with the bracket 50. The bracket 50 is detachably connected to the sorting machine test turntable.
[0026] The aforementioned needle holder device for a cylindrical lithium-ion battery voltage resistance sorting machine utilizes a pluggable connection design to enable rapid assembly and disassembly of the test needle 10, needle holder 20, and bracket 50, significantly simplifying the maintenance process. The welding plate 40 integrates conductive paths, reducing wire clutter and preventing signal crosstalk. The detachable connection between the bracket 50 and the turntable adapts to different sorting machine models, reducing equipment modification costs. Modifying the needle holder 20 of the sorting machine's voltage resistance tester improves work efficiency, ensures reliable structure, and allows for rapid debugging and stable operation. This device integrates the test needle 10, welding plate 40, and needle holder 20 into a single unit, improving efficiency, reducing failure rate, facilitating maintenance, and enabling rapid accuracy verification. It also solves the problem of cumbersome test needle 10 replacement in the needle holder 20.
[0027] The test probe 10 measures φ2.6*40mm, is made of brass, has a gold-plated surface, a three-pointed tip, and has an elasticity of 500g.
[0028] Two test pins 10 are embedded in the pin holder 20 without the need for welding;
[0029] The welding plate 40 is fastened to the rear end of the needle holder 20 without the need for screws.
[0030] The voltage internal resistance meter 30 is a HIOKI BT3562 instrument.
[0031] The pin holder 20 is made of polyoxymethylene (POM), which has excellent mechanical properties, strong wear resistance, and good insulation.
[0032] In this embodiment, the needle holder 20 has two needle position holes 21 arranged side by side or parallel to each other. The needle position holes 21 penetrate the needle holder 20 laterally. One end of the test needle 10 passes through the needle position hole 21 and is exposed on the rear end of the needle holder 20, forming a welding section 12. The other end of the test needle 10 is exposed on the front end of the needle holder 20, forming a test section 11. The welding sections 12 of the two test needles 10 are respectively connected to the welding plate 40 by wires. The welding plate 40 leads out wires to the input terminal of the voltage internal resistance meter 30.
[0033] The transversely penetrating needle hole 21 ensures that the test needle 10 is assembled in a straight line, avoiding poor contact caused by oblique insertion; the split welding section 12 (rear end) and test section 11 (front end) design isolate the welding heat-affected zone, extend the probe life, and adapt to the electrode spacing requirements of various cylindrical batteries with diameters of 15-25mm.
[0034] Welding section 12 is electrically connected to welding plate 40 via wires.
[0035] In this embodiment, a boss 13 is provided on the outer periphery of the test needle 10. The boss 13 is arranged around the circumference of the test needle 10. A limiting groove 22 is formed in the needle position hole 21. When the test needle 10 passes through the needle position hole 21, the rear end face of the boss 13 abuts against the inner sidewall of the limiting groove 22.
[0036] The interference fit between the boss 13 and the limiting groove 22 forms a mechanical self-locking mechanism to prevent the test needle 10 from retracting or rotating, and the axial tensile strength is greater than 50N; ensuring the consistency of the battery tab contact area.
[0037] In this embodiment, the front end face of the boss 13 is arranged flush with the front end face of the needle seat 20.
[0038] The front face of the boss 13 is flush with the needle seat 20 to form a reference plane, which ensures the control of the extension length tolerance of the test section 11, improves the uniformity of contact pressure, and avoids measurement drift caused by unilateral wear.
[0039] In this embodiment, the welding plate 40 and the test probe 10 are arranged at intervals. This utilizes air insulation to prevent high-voltage breakdown, while also increasing heat dissipation space and preventing the welding plate 40 from deforming due to high temperatures.
[0040] In this embodiment, the bracket 50 has an L-shaped structure and includes a vertical plate 51 and a horizontal plate 52. The bottom of the vertical plate 51 is vertically connected to one end of the horizontal plate 52.
[0041] The bracket 50 is L-shaped, made of stainless steel, and 2mm thick. The vertical position of the test probe 10 can be adjusted, and the screw hole 53 can be used to adjust the left and right and front and back positions of the test probe 10.
[0042] In this embodiment, the needle holder 20 has an embedded cavity 23 with a bottom opening, the upper part of the vertical plate 51 is embedded in the embedded cavity 23, and the upper outer periphery of the vertical plate 51 abuts against the inner sidewall of the embedded cavity 23.
[0043] The tight fit between the embedded cavity 23 and the vertical plate 51 enables three-dimensional positioning. The bottom opening design of the needle seat 20 facilitates quick insertion and removal from the bracket 50, and also facilitates the cleaning of metal shavings, reducing the risk of short circuits.
[0044] In this embodiment, the bracket 50 has screw holes 53. The bracket 50 is fixed to the sorting machine test turntable by screws passing through the screw holes 53. The screw holes 53 are located on the horizontal plate 52. In this way, the needle seat 20 is embedded and fixed in the bracket 50, and the bracket 50 and the sorting machine test turntable are fixed by screws passing through the screw holes 53.
[0045] In this embodiment, the rear end of the needle seat 20 is concave inward to form an embedding groove 24, and the two sides of the embedding groove 24 are provided with buckling blocks. The welding plate 40 is installed in the embedding groove 24, and the buckling blocks abut against the two sides of the welding plate 40.
[0046] The trapezoidal cross section (45° inclination angle) of the embedded groove 24 forms a bidirectional limiting with the buckle block. The installation force only needs 10N to lock the welding plate 40, and the pull-out force is >30N. The elastic deformation of the buckle block is ≤0.2mm, and it can support more than 5,000 repeated disassembly and assembly without failure, improving maintenance efficiency by 5 times.
[0047] Specific usage method: When the test needle 10 is replaced, use an electrochrome plating iron to melt the separation between the solder section 12 and the wire, and the test needle 10 is removed from the needle holder 20. The tail end of the new test needle 10 is inserted into the needle position hole 21 of the needle holder 20. The boss 13 of the test needle 10 is flush with the front end face of the needle holder 20. After the two test needles 10 are inserted, the wire is covered with insulating heat shrink tubing, and the wire is re-soldered with an electrochrome plating iron. The insulating heat shrink tubing shrinks at the solder section 12.
[0048] 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 and improvements 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 needle holder device for a cylindrical lithium-ion battery voltage internal resistance sorting machine, characterized in that, The device includes two adjacent test pins, a pin holder, a voltage internal resistance meter, and a welding plate. The two test pins are respectively embedded in the pin holder and are plugged into each other. The test pins and the pin holder are connected by a plug-in connection. The welding plate is fastened to the rear end of the pin holder and is electrically connected to the welding plate. The welding plate is electrically connected to the voltage internal resistance meter through a wire. The bottom of the pin holder is provided with a bracket, and the pin holder is plugged into the bracket. The bracket is detachably connected to the sorting machine test turntable.
2. The needle holder device of a cylindrical lithium-ion battery voltage internal resistance sorting machine as described in claim 1, characterized in that, The needle holder has two needle position holes arranged side by side or parallel to each other. The needle position holes penetrate the needle holder laterally. One end of the test needle passes through the needle position hole and is exposed on the rear end of the needle holder, forming a welding section. The other end of the test needle is exposed on the front end of the needle holder, forming a test section.
3. The needle holder device of a cylindrical lithium-ion battery voltage internal resistance sorting machine as described in claim 2, characterized in that, The welding section and the welding plate are electrically connected by a wire.
4. The needle holder device of a cylindrical lithium-ion battery voltage internal resistance sorting machine as described in claim 3, characterized in that, The outer periphery of the test needle is provided with a boss, which is arranged around the circumference of the test needle. A limiting groove is formed in the needle position hole. When the test needle passes through the needle position hole, the rear end face of the boss abuts against the inner sidewall of the limiting groove.
5. The needle holder device of a cylindrical lithium-ion battery voltage internal resistance sorting machine as described in claim 4, characterized in that, The front face of the boss is flush with the front face of the needle seat.
6. The needle holder device of a cylindrical lithium-ion battery voltage internal resistance sorting machine as described in claim 1, characterized in that, The welding plate and the test probe are arranged at intervals.
7. The needle holder device for a cylindrical lithium-ion battery voltage internal resistance sorting machine as described in any one of claims 1 to 6, characterized in that, The bracket has an L-shaped structure and includes a vertical plate and a horizontal plate. The bottom of the vertical plate is vertically connected to one end of the horizontal plate.
8. The needle holder device of a cylindrical lithium-ion battery voltage internal resistance sorting machine as described in claim 7, characterized in that, The needle holder has an embedded cavity with a bottom opening, the upper part of the vertical plate is embedded in the embedded cavity, and the outer periphery of the upper part of the vertical plate abuts against the inner wall of the embedded cavity.
9. The needle holder device of a cylindrical lithium-ion battery voltage internal resistance sorting machine as described in claim 8, characterized in that, The bracket has screw holes, and the bracket is fixed to the sorting machine test turntable by screws passing through the screw holes. The screw holes are located on the horizontal plate.
10. The needle holder device of a cylindrical lithium-ion battery voltage internal resistance sorting machine as described in any one of claims 1 to 6, characterized in that, The rear end of the needle seat has an inwardly concave groove, and the two sides of the groove have protruding latching blocks. The welding plate is installed in the groove, and the latching blocks abut against the two sides of the welding plate.