A high current probe set

Abstract

The utility model discloses a kind of high current probe groups, including three groups of connected plastic seat, the inside of three groups The plastic seat is equipped with current needle stem, modular design is adopted, especially probe assembly part, such as first current needle head and second current needle head are designed as detachable or independent replacement structure, this solves the problem that traditional probe head and stem integrated structure need overall replacement or disassembly repair when maintaining, significantly reduce maintenance cost and working time;Through design makes that third current needle head and current needle stem can be separately formed and separately electroplated, this design allows current needle head to adopt copper alloy material, and current needle stem can adopt aluminum alloy and other suitable materials, without increasing the complexity of electroplating process because of different materials, so that ordinary electroplating factory on market can be produced, reduce production cost and process difficulty.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically a high-current probe group. Background Technology

[0002] During the production of power batteries or energy storage batteries, charging and discharging tests are required during the formation and capacity testing stage. The industry faces the following two technical deficiencies:

[0003] On the one hand, the probe head and rod currently used in the market are combined into a single structure. When the probe contact head reaches the end of its service life, it is necessary to remove the entire probe from the equipment and replace it with a brand new probe, or disassemble all the parts of the old probe and re-repair the contact head. After the contact head is repaired, the probe must be reassembled. The workload and cost of the entire repair process are very large.

[0004] On the other hand, the current probes currently used in the market are initially processed into semi-finished shapes, and then the current probes and current rods are combined to form the finished product shape. Finally, the whole assembly is electroplated. However, the electroplating process requires that the current probes and current rods be made of copper alloy materials to be suitable for common electroplating processes. If the copper alloy material of the current probes and the aluminum alloy material of the current rods are combined into one electroplating unit, the electroplating process will be more complicated. Most electroplating factories in the market do not have this electroplating process. It is necessary to change the product structure so that the current probes and current rods are formed and electroplated separately before being combined into one unit. This satisfies the requirement that the current probes and current rods are made of different materials, and also meets the requirements that ordinary electroplating factories in the market can produce. Therefore, we need to propose a high-current probe assembly. Utility Model Content

[0005] The purpose of this invention is to provide a high-current probe assembly to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A high-current probe assembly includes three interconnected plastic bases. Each of the three plastic bases has a current probe rod installed inside. A probe assembly is installed at the bottom of each current probe rod. Two sets of locking nuts are threaded onto the top outer wall of each current probe rod. Large springs are fitted onto the bottom outer wall of each of the three current probe rods. The tops of the three large springs are fixedly installed to the bottom of the three plastic bases. A gasket is fixedly fitted onto the outer wall of the middle current probe rod. The bottom of one of the large springs abuts against the top of the gasket. T-shaped isolation sleeves are inserted into the tops of each of the three current probe rods.

[0008] The probe assembly includes a first current needle, inside which a current needle rod seat is inserted. The top of the current needle rod seat is riveted to the bottom of the current needle rod. A first voltage needle rod is inserted inside the current needle rod seat and the current needle rod. The bottom of the first voltage needle rod extends into the interior of the first current needle and abuts against the first voltage needle. The top of the first voltage needle rod extends out and is located above the current needle rod. A first isolation sleeve is embedded inside the bottom of the first current needle. The first voltage needle is snapped into the interior of the first isolation sleeve. A left connecting sleeve and a right connecting sleeve that cooperate with each other are snapped into the top outer wall of the first current needle. The left connecting sleeve and the right connecting sleeve are snapped into and fixed to the bottom outer wall of the current needle rod by two sets of pins.

[0009] Two sets of first isolation rings are symmetrically fixedly sleeved on the bottom outer wall of the first voltage needle rod. One set is located inside the current needle rod seat, and the other set is located inside the current needle rod. A first spring is fixedly installed between the two sets of first isolation rings, and the first spring is sleeved on the outer wall of the first voltage needle rod.

[0010] The probe assembly includes a second current needle, which is detachably sleeved on the bottom outer wall of the current needle rod. A locking bolt is provided between the second current needle and the current needle rod. A second isolation sleeve is inserted inside the second current needle, and a second voltage needle is inserted inside the second isolation sleeve. An isolation tube is inserted into the inner wall of the bottom of the current needle rod, and the top of the second voltage needle extends through the second isolation sleeve into the interior of the isolation tube. A plastic pin is inserted into the side wall of the isolation tube, penetrating the interior of the second voltage needle. A second voltage needle rod is inserted into the top of the isolation tube, and the bottom of the second voltage needle rod abuts against the top of the second voltage needle. The top of the second voltage needle rod extends out above the current needle rod.

[0011] The bottom outer wall of the second voltage needle rod is symmetrically fitted with two sets of second isolation rings, and a second spring is fixedly installed between the two sets of second isolation rings, with the second spring sleeved on the outer wall of the second voltage needle rod.

[0012] The second current needle has a bolt hole on one side that matches the locking bolt, and an abutting slope on the bottom side wall of the current needle rod. One end of the locking bolt passes through the bolt hole and abuts against the abutting slope. A flat orientation surface is provided on the side of the current needle rod away from the abutting slope. A limiting plane that matches the flat orientation surface is provided on the inner side wall of the second current needle.

[0013] The probe assembly includes a third current needle, a third isolation sleeve installed inside the bottom of the third current needle, and the inside of the top of the third current needle riveted to the bottom of the current needle rod. A third voltage needle is slidably inserted inside the third isolation sleeve, and a third voltage needle rod is integrally formed on the top of the third voltage needle. The top of the third voltage needle rod extends through the third isolation sleeve, the third current needle, and the current needle rod to the top of the current needle rod. Two sets of positioning grooves are symmetrically opened on the inner wall of the top of the third current needle, and positioning pins are inserted into the interior of both sets of positioning grooves. The top sidewalls of the two sets of positioning pins abut against the bottom outer wall of the current needle rod.

[0014] The inner sidewall of the third current needle has two sets of symmetrical riveting grooves at the bottom. The bottom outer wall of the current needle rod has a riveting protrusion that matches the riveting groove. The riveting protrusion is riveted to the inside of the riveting groove.

[0015] A third isolation ring is fixedly sleeved on the bottom outer wall of the third voltage needle rod, and a third spring is fixedly installed on the bottom of the third isolation ring. The third spring is sleeved on the outer wall of the third voltage needle rod, and the bottom of the third spring abuts against the top of the third isolation ring.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. The high current probe assembly of this utility model adopts a modular design. In particular, the probe components, such as the first current needle and the second current needle, are designed to be detachable or replaceable independently. This solves the problem that the traditional probe head and rod are integrated and need to be replaced or disassembled for repair during maintenance, which significantly reduces maintenance costs and working time.

[0018] 2. This utility model is designed so that the third current needle and the current needle rod can be formed and electroplated separately. This design allows the current needle to be made of copper alloy, while the current needle rod can be made of aluminum alloy or other suitable materials. There is no need to increase the complexity of the electroplating process due to different materials, so that ordinary electroplating factories can produce it, reducing production costs and process difficulty. Attached Figure Description

[0019] Figure 1 This is a side view of the three-dimensional structure of the present invention;

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 3 This is a schematic diagram of the exploded structure of the probe assembly in Embodiment 1 of this utility model;

[0022] Figure 4 This is a schematic diagram of the exploded structure of the probe assembly in Embodiment 2 of this utility model;

[0023] Figure 5 This is a schematic diagram of the exploded structure of the probe assembly in Embodiment 3 of this utility model;

[0024] Figure 6 These are schematic diagrams of the probe assemblies in three embodiments of this utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the second current needle and current needle rod in Embodiment 2 of this utility model;

[0026] Figure 8 This is a three-dimensional structural diagram of the plastic base of this utility model;

[0027] Figure 9 This utility model Figure 2 Enlarged structural diagram at point A;

[0028] Figure 10 This utility model Figure 2 Enlarged structural diagram at point B;

[0029] Figure 11 This is a cross-sectional structural diagram of the probe assembly in Embodiment 1 of this utility model.

[0030] In the diagram: 1. Plastic base; 2. Current needle rod; 3. Probe assembly; 31. First current needle; 32. Current needle rod base; 33. First voltage needle rod; 34. First isolation sleeve; 35. First voltage needle; 36. First isolation ring; 37. First spring; 38. Left connecting sleeve; 39. Right connecting sleeve; 310. Second current needle; 311. Second isolation sleeve; 312. Second voltage needle; 313. Isolation sleeve; 314. Plastic pin; 315. Second voltage needle rod; 316. Second isolation ring; 317. Second spring; 318. Locking bolt; 319. Third current needle; 320. Third isolation sleeve; 321. Third voltage needle; 322. Third voltage needle rod; 323. Third isolation ring; 324. Third spring; 325. Positioning pin; 326. Riveting groove; 4. Locking nut; 5. T-shaped isolation sleeve; 6. Large spring. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figure 1-11 This utility model provides a technical solution:

[0033] Example 1:

[0034] A high-current probe assembly includes: three interconnected plastic bases 1, each of the three plastic bases 1 having a current probe 2 installed inside, a probe assembly 3 installed at the bottom of the current probe 2, two sets of locking nuts 4 threaded onto the top outer wall of the current probe 2, a large spring 6 fitted onto the bottom outer wall of each of the three sets of current probe 2, the tops of the three sets of large springs 6 being fixedly installed to the bottoms of the three plastic bases 1 respectively, and a gasket fixedly fitted onto the outer wall of the middle set of current probe 2, with the bottom of one set of large springs 6 abutting against the top of the gasket, and a T-shaped isolation sleeve 5 inserted into the top of each of the three sets of current probe 2.

[0035] The three sets of plastic bases 1 are connected in an integrated or spliced ​​structure to form an overall frame. The plastic bases are made of engineering plastics with high temperature resistance and excellent insulation properties (such as PBT, PA66, PPS), or can be common models on the market. They provide a stable installation base for the current probe rods and isolate electrical interference between the three sets of current probe rods. The current probe rods are made of high conductivity materials (such as red copper, copper alloy, aluminum alloy, etc. with nickel plating) to ensure high current transmission efficiency. The high current probe group can be used in combination, or it can be used individually or in any combination by disconnecting the connection points of the three sets of plastic bases 1. The large spring 6 is made of high-strength alloy material and has a large elastic deformation range. Its top is fixed to the plastic base 1, and its bottom is connected to the left side through a gasket (or directly). The sleeve 38 provides overall cushioning when the probe assembly 3 contacts the test piece, absorbing the impact force during testing. The large spring 6 buffers and protects the probe assembly 3 and the test piece, avoiding damage caused by hard contact. After the probe assembly 3 contacts the test piece, the large spring compresses a certain stroke to generate the required contact force. The "T"-shaped structure of the T-shaped isolation sleeve 5 can axially limit it, preventing it from falling off the top of the current needle rod 2. The material is made of highly insulating plastic, physically isolating the voltage needle rod from the top output end of the current needle rod 2. The inner wall is precision polished to reduce frictional resistance when sliding with the voltage needle rod, ensuring smooth extension and retraction. The T-shaped structure has both positioning and insulation functions, and the low-friction design ensures the sensitive extension and retraction of the voltage needle rod, improving the response speed of the probe in dynamic testing.

[0036] In an optional embodiment: the probe assembly 3 includes a first current needle 31, a current needle rod seat 32 is inserted inside the first current needle 31, the top of the current needle rod seat 32 is riveted to the bottom of the current needle rod 2, and a first voltage needle rod 33 is inserted inside the current needle rod seat 32 and the current needle rod 2. The bottom of the first voltage needle rod 33 extends into the interior of the first current needle 31 and abuts against a first voltage needle 35. The top of the first voltage needle rod 33 extends out from the current needle rod 2 and is located above the current needle rod 2. A first isolation sleeve 34 is embedded inside the bottom of the first current needle 31. The first voltage needle 35 is snapped into the interior of the first isolation sleeve 34. A left connecting sleeve 38 and a right connecting sleeve 39 that cooperate with each other are snapped into the top outer wall of the first current needle 31. The left connecting sleeve 38 and the right connecting sleeve 39 are snapped and fixed to the bottom outer wall of the current needle rod 2 by two sets of pins.

[0037] It should be noted that the current needle holder 32 and the current needle 2 are riveted using a cold pressing process to ensure a low-impedance connection of their conductive paths; alternatively, they can be configured as an integral molding structure, with the first isolation sleeve 34 made of a high-temperature resistant insulating material (such as ceramic, polytetrafluoroethylene, or engineering plastic) to physically isolate the first voltage needle 35 and the first current needle 31 to prevent short circuits; the left and right connecting sleeves adopt a symmetrical split design, which can wrap around the top of the first current needle 31 from both sides and be snapped into the current needle 2 with pins to achieve rapid assembly and positioning of the probe assembly 3 and the current needle 2.

[0038] It is worth noting that the connection between the current needle holder 32 and the first current needle 31 can be set as spherical to spherical, plane to plane, or cone to cone. When the end face of the probe head is at an angle to the battery plane, this structure has a universal adjustment function, so that the probe head automatically adjusts the angle to fit completely with the battery plane.

[0039] Two sets of first isolation rings 36 are symmetrically fixedly sleeved on the bottom outer wall of the first voltage needle rod 33. One set is located inside the current needle rod seat 32, and the other set is located inside the current needle rod 2. A first spring 37 is fixedly installed between the two sets of first isolation rings 36, and the first spring 37 is sleeved on the outer wall of the first voltage needle rod 33.

[0040] It should be noted that the two sets of first isolation rings 36 respectively cooperate with the inner walls of the current needle holder 32 and the current needle 2 to limit the radial wobble of the first voltage needle 33 and ensure the stability of axial extension and contraction; the first spring 37 provides a reset force for the voltage needle, pushing it back to its initial position after the test pressure disappears, avoiding needle jamming. The double isolation rings improve the guiding accuracy of the voltage needle, and the spring reset function ensures the reliability of repeated use of the probe, which is suitable for automated high-frequency testing scenarios.

[0041] Example 2:

[0042] A high-current probe assembly includes: three interconnected plastic bases 1, each of the three plastic bases 1 having a current probe 2 installed inside, a probe assembly 3 installed at the bottom of the current probe 2, two sets of locking nuts 4 threaded onto the top outer wall of the current probe 2, a large spring 6 fitted onto the bottom outer wall of each of the three sets of current probe 2, the tops of the three sets of large springs 6 being fixedly installed to the bottoms of the three plastic bases 1 respectively, and a gasket fixedly fitted onto the outer wall of the middle set of current probe 2, with the bottom of one set of large springs 6 abutting against the top of the gasket, and a T-shaped isolation sleeve 5 inserted into the top of each of the three sets of current probe 2.

[0043] The probe assembly 3 includes a second current needle 310, which is detachably sleeved on the bottom outer wall of the current needle rod 2. A locking bolt 318 is provided between the second current needle 310 and the current needle rod 2. A second isolation sleeve 311 is inserted inside the second current needle 310. A second voltage needle 312 is inserted inside the second isolation sleeve 311. An isolation tube 313 is inserted into the inner wall of the bottom of the current needle rod 2. The top of the second voltage needle 312 extends through the second isolation sleeve 311 into the interior of the isolation tube 313. A plastic pin 314 is inserted into the side wall of the isolation tube 313, penetrating the interior of the second voltage needle 312. A second voltage needle rod 315 is inserted into the top of the isolation tube 313, and the bottom of the second voltage needle rod 315 abuts against the top of the second voltage needle 312. The top of the second voltage needle rod 315 extends out to the top of the current needle rod 2, which is located above the current needle rod 2.

[0044] It should be noted that the second current needle 310 adopts a detachable sleeve structure for easy needle replacement; the locking bolt 318 fixes the second current needle 310 to the current needle rod 2 through radial pressure, and together with the isolation sleeve 313 and the plastic pin 314 (insulating material), it not only fixes the axial position of the second voltage needle 312, but also isolates its electrical connection with the current path; the abutment design between the second voltage needle rod 315 and the second voltage needle 312 allows for a certain range of axial expansion and contraction to accommodate contact errors during testing. The detachable structure improves the convenience of maintenance and replacement, the plastic pin 314 achieves dual functions of insulation and positioning, and the telescopic voltage path design enhances the fault tolerance of test contact, making it suitable for diverse test scenarios.

[0045] In an optional embodiment: two sets of second isolation rings 316 are symmetrically fixedly sleeved on the bottom outer wall of the second voltage needle rod 315, and a second spring 317 is fixedly installed between the two sets of second isolation rings 316, and the second spring 317 is sleeved on the outer wall of the second voltage needle rod 315.

[0046] It should be noted that the second isolation ring 316 is made of insulating material and is used to separate the second spring 317 from the inner wall of the current needle rod 2 to prevent the spring from conducting electricity and causing a short circuit. The second spring 317 is made of corrosion-resistant alloy material and is in a pre-compressed state under natural conditions, providing a continuous downward elastic force to the second voltage needle rod 315, ensuring that the second voltage needle 312 is in close contact with the test point. The isolation ring ensures electrical safety, and the pre-compressed spring design ensures that the voltage needle always maintains reliable contact, reducing signal interruption caused by vibration or slight displacement and improving test stability.

[0047] In an optional embodiment: a bolt hole adapted to the locking bolt 318 is provided on one side of the second current needle 310, and an abutting slope is provided on the bottom side wall of the current needle rod 2. One end of the locking bolt 318 passes through the bolt hole and abuts against the abutting slope. A flat orientation surface is provided on the side of the current needle rod 2 away from the abutting slope. A limiting plane adapted to the flat orientation surface is provided on the inner side wall of the second current needle 310. When the current needle rod 2 is inserted into the second current needle 310, the current needle rod 2 is inserted through the flat orientation surface and abuts against the limiting plane. The locking bolt 318 locks the other side of the current needle rod 2.

[0048] It should be noted that the contact surface between the abutting bevel and the locking bolt 318 is precision machined. When the locking bolt 318 is tightened, its end generates an axial component force along the bevel, pulling the second current needle 310 towards the bottom of the current needle rod 2, achieving dual fixation in both the radial and axial directions. The inner wall of the bolt hole is provided with anti-slip threads to enhance the anti-loosening ability of the locking bolt. The bevel abutting structure makes the fixing force more uniform, avoiding excessive local stress that could cause component deformation. The dual fixing effect prevents the second current needle 310 from loosening due to heat expansion during high-current testing, thus improving structural stability.

[0049] Example 3:

[0050] A high-current probe assembly includes: three interconnected plastic bases 1, each of the three plastic bases 1 having a current probe 2 installed inside, a probe assembly 3 installed at the bottom of the current probe 2, two sets of locking nuts 4 threaded onto the top outer wall of the current probe 2, a large spring 6 fitted onto the bottom outer wall of each of the three sets of current probe 2, the tops of the three sets of large springs 6 being fixedly installed to the bottoms of the three plastic bases 1 respectively, and a gasket fixedly fitted onto the outer wall of the middle set of current probe 2, with the bottom of one set of large springs 6 abutting against the top of the gasket, and a T-shaped isolation sleeve 5 inserted into the top of each of the three sets of current probe 2.

[0051] The probe assembly 3 includes a third current needle 319. A third isolation sleeve 320 is installed inside the bottom of the third current needle 319, and the inside of the top is riveted to the bottom of the current needle rod 2. A third voltage needle 321 is slidably inserted inside the third isolation sleeve 320, and a third voltage needle rod 322 is integrally formed on the top of the third voltage needle 321. The top of the third voltage needle rod 322 extends through the third isolation sleeve 320, the third current needle 319 and the current needle rod 2 to the top of the current needle rod 2. Two sets of positioning grooves are symmetrically opened on the inner wall of the top of the third current needle 319. Positioning pins 325 are inserted into the inside of both sets of positioning grooves, and the top sidewalls of the two sets of positioning pins 325 abut against the bottom outer wall of the current needle rod 2.

[0052] It should be noted that the riveting of the third current needle 319 and the current needle rod 2 adopts a multi-contact design, which increases the conductive contact area and reduces the temperature rise during high current transmission; the third voltage needle 321 and the third voltage needle rod 322 are integrally formed, reducing assembly errors and improving the continuity of voltage signal transmission; the positioning pin 325 is embedded in the positioning groove and abuts against the outer wall of the current needle rod 2, restricting the radial rotation of the third current needle 319 and ensuring assembly concentricity. The integrally formed structure reduces signal transmission loss, the multi-contact riveting reduces contact resistance, and the positioning pin 325 design ensures component concentricity, making it suitable for high-precision voltage testing scenarios.

[0053] In an optional embodiment: the bottom of the inner sidewall of the third current needle 319 is provided with two sets of riveting grooves 326 symmetrically, and the bottom outer wall of the current needle rod 2 is provided with a riveting protrusion that matches the riveting groove 326, and the riveting protrusion is riveted to the inside of the riveting groove 326.

[0054] It should be noted that the riveting groove 326 and the riveting protrusion adopt a complementary wedge structure. During riveting, mechanical pressure causes the protrusion to plastically deform and fill the groove, forming an irreversible mechanical lock and conductive connection. The two sets of symmetrically distributed riveting structures ensure uniform force distribution and avoid relative offset between the third current needle 319 and the current needle rod 2. The riveting structure not only ensures the strength of the mechanical connection but also ensures the low impedance characteristics of the conductive path. The symmetrical design improves the torsional performance of the overall structure and is suitable for testing in high vibration environments.

[0055] In an optional embodiment: a third isolation ring 323 is fixedly sleeved on the bottom outer wall of the third voltage needle rod 322, and a third spring 324 is fixedly installed on the bottom of the third isolation ring 323. The third spring 324 is sleeved on the outer wall of the third voltage needle rod 322, and the bottom of the third spring 324 abuts against the top of the third isolation sleeve 320.

[0056] It should be noted that the third isolation ring 323 isolates the third spring 324 from the inner wall of the third current needle 319, preventing the spring from conducting current; the third spring 324 provides buffering force when the third voltage needle rod 322 extends and retracts. Its elastic coefficient has been optimized to ensure close contact between the third voltage needle 321 and the test point, while avoiding excessive pressure damage to the test surface. The isolation ring ensures electrical safety, and the spring buffering design balances contact pressure and test protection, extending the service life of the probe and the test piece.

[0057] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-current probe assembly, characterized in that, The device includes three interconnected plastic bases (1), each of which has an internal current needle rod (2). The bottom of the current needle rod (2) is equipped with a probe assembly (3). The top outer wall of the current needle rod (2) is threaded with two sets of locking nuts (4). The bottom outer wall of each of the three sets of current needle rods (2) is fitted with a large spring (6). The top of each of the three sets of large springs (6) is fixedly installed to the bottom of the three sets of plastic bases (1). The outer wall of the middle set of current needle rods (2) is fixedly fitted with a gasket. The bottom of one set of large springs (6) abuts against the top of the gasket. The top of each of the three sets of current needle rods (2) is inserted with a T-shaped isolation sleeve (5).

2. The high-current probe assembly according to claim 1, characterized in that: The probe assembly (3) includes a first current needle (31), a current needle rod seat (32) is inserted inside the first current needle (31), the top of the current needle rod seat (32) is riveted to the bottom of the current needle rod (2), and a first voltage needle rod (33) is inserted inside the current needle rod seat (32) and the current needle rod (2). The bottom of the first voltage needle rod (33) extends into the interior of the first current needle (31) and abuts against the first voltage needle (35). The top of the current needle rod (2) extends out and is located above the current needle rod (2). A first isolation sleeve (34) is embedded inside the bottom of the first current needle (31). The first voltage needle (35) is snapped into the interior of the first isolation sleeve (34). The top outer wall of the first current needle (31) is snapped with a left connecting sleeve (38) and a right connecting sleeve (39) that cooperate with each other. The left connecting sleeve (38) and the right connecting sleeve (39) are snapped and fixed to the bottom outer wall of the current needle rod (2) by two sets of pins.

3. A high-current probe assembly according to claim 2, characterized in that: Two sets of first isolation rings (36) are symmetrically fixedly sleeved on the bottom outer wall of the first voltage needle rod (33). One set is located inside the current needle rod seat (32), and the other set is located inside the current needle rod (2). A first spring (37) is fixedly installed between the two sets of first isolation rings (36), and the first spring (37) is sleeved on the outer wall of the first voltage needle rod (33).

4. A high-current probe assembly according to claim 1, characterized in that: The probe assembly (3) includes a second current needle (310), which is detachably sleeved on the bottom outer wall of the current needle rod (2). A locking bolt (318) is provided between the second current needle (310) and the current needle rod (2). A second isolation sleeve (311) is inserted inside the second current needle (310). A second voltage needle (312) is inserted inside the second isolation sleeve (311). An isolation sleeve (313) is inserted into the inner wall of the bottom of the current needle rod (2). The top of the second voltage needle (312) extends through the second isolation sleeve (311) into the interior of the isolation sleeve (313). A plastic pin (314) that penetrates the interior of the second voltage needle (312) is inserted into the side wall of the isolation sleeve (313). The top of the isolation sleeve (313) is inserted with the second voltage needle rod (315), and the bottom of the second voltage needle rod (315) abuts against the top of the second voltage needle (312). The top extends out a current needle rod (2) located above the current needle rod (2).

5. A high-current probe assembly according to claim 4, characterized in that: The bottom outer wall of the second voltage needle rod (315) is symmetrically fitted with two sets of second isolation rings (316), and a second spring (317) is fixedly installed between the two sets of second isolation rings (316), and the second spring (317) is fitted on the outer wall of the second voltage needle rod (315).

6. A high-current probe assembly according to claim 4, characterized in that: The second current needle (310) has a bolt hole on one side that matches the locking bolt (318), and the bottom side wall of the current needle rod (2) has an abutting slope. One end of the locking bolt (318) passes through the bolt hole and abuts against the abutting slope. The side of the current needle rod (2) away from the abutting slope has a flat orientation surface. The inner side wall of the second current needle (310) has a limiting plane that matches the flat orientation surface.

7. A high-current probe assembly according to claim 1, characterized in that: The probe assembly (3) includes a third current needle (319), a third isolation sleeve (320) is installed inside the bottom of the third current needle (319), and the inside of the top is riveted to the bottom of the current needle rod (2). A third voltage needle (321) is slidably inserted inside the third isolation sleeve (320), and a third voltage needle rod (322) is integrally formed on the top of the third voltage needle (321). The top of the third voltage needle rod (322) extends through the third isolation sleeve (320), the third current needle (319) and the current needle rod (2) to the top of the current needle rod (2). Two sets of positioning grooves are symmetrically opened on the inner wall of the top of the third current needle (319). Positioning pins (325) are inserted into the inside of both sets of positioning grooves, and the top sidewalls of the two sets of positioning pins (325) abut against the bottom outer wall of the current needle rod (2).

8. A high-current probe assembly according to claim 7, characterized in that: The inner sidewall of the third current needle (319) is symmetrically provided with two sets of riveting grooves (326) at the bottom. The bottom outer wall of the current needle rod (2) is provided with a riveting protrusion that matches the riveting groove (326). The riveting protrusion is riveted to the inside of the riveting groove (326).

9. A high-current probe assembly according to claim 7, characterized in that: The bottom outer wall of the third voltage needle rod (322) is fixedly sleeved with a third isolation ring (323), and the bottom of the third isolation ring (323) is fixedly installed with a third spring (324). The third spring (324) is sleeved on the outer wall of the third voltage needle rod (322), and the bottom of the third spring (324) abuts against the top of the third isolation sleeve (320).

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