A new photovoltaic cell iv detection probe

Abstract

The utility model relates to battery piece IV detection probe technical field, concretely is a kind of novel photovoltaic battery piece IV detection probe. Including the probe seat cover of connecting gas pipeline, the probe unit being arranged in probe seat cover;Probe unit includes probe cover, probe core and probe head, probe cover is sealingly connected in probe seat cover and located the downstream of gas flow direction, probe core is sealingly slidingly connected in probe cover and probe core both ends all extend out probe cover both ends, the one end of probe core located the upstream of gas flow direction is equipped with the limiting step that can be with probe cover, the one end of probe core located the downstream of gas flow direction is equipped with probe head;The outer diameter of probe head is greater than the inner diameter of probe cover and the one end of probe head located the downstream of gas flow direction is equipped with arc convex point;The one end of probe seat cover located the upstream of gas flow direction is equipped with airtight cavity, probe core can move in airtight cavity and sealingly slidingly relative to probe cover. The mode of barometric pressure drive avoids battery piece damage.

Description

Technical Field

[0001] This utility model relates to the field of IV detection probe technology for solar cells, specifically a novel IV detection probe for photovoltaic solar cells. Background Technology

[0002] In AI testing of solar photovoltaic cells, current testing equipment uses spring-driven probes. The springs connect to the probes and wait for the cell to arrive, at which point the springs are in their natural state. Once the cell is in place, a pressure plate presses down on it, compressing the springs. This spring-driven probe method presents several problems during cell testing. If the pressure of the pressure plate on the cell increases, the springs are compressed further, resulting in a stronger reaction force from the springs on the probes. This force is also difficult to control, easily leading to damage to the cell from the spring's reaction force. In other words, the spring's reaction force on the probe increases with increasing pressure, easily causing surface damage to the cell. Repeated spring compression can also lead to metal fatigue, spring breakage, or jamming. Traditional spring probes cause an 80% damage rate in BC cell testing. If the damage rate reaches 100% with repeated measurements, severe damage can lead to a cell efficiency degradation rate >1.5%. This is particularly problematic for iterative new cell technologies such as BC and HJT, where probe testing of the cell exhibits large fluctuations in measurement repeatability and stability.

[0003] In view of the above, it is urgent to solve the problems of damage caused by the spring reaction force after the probe contacts the battery cell, as well as the poor stability of the test contact. Utility Model Content

[0004] The problem to be solved is to provide a gas-driven non-destructive probe structure to overcome the defects of existing probe testing, replace the spring probe, achieve more stable contact between the probe and the solar cell, avoid contact damage to the solar cell by the probe, and ensure stable test contact.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a novel photovoltaic cell IV testing probe, comprising a probe holder connected to a gas pipeline and a probe unit disposed within the probe holder; the probe unit includes a probe sleeve, a probe core, and a probe head, the probe sleeve being sealed and connected within the probe holder and located downstream in the gas flow direction, the probe core being sealed and slidably connected within the probe sleeve, with both ends of the probe core extending beyond both ends of the probe sleeve, the upstream end of the probe core in the gas flow direction having a limiting step that can abut against the probe sleeve, and the downstream end of the probe core having a probe head; the outer diameter of the probe head is larger than the inner diameter of the probe sleeve, and the downstream end of the probe head in the gas flow direction contacts the solar cell; an airtight cavity is provided at the upstream end of the probe holder in the gas flow direction, and the probe core can move within the airtight cavity and slide sealed relative to the probe sleeve.

[0006] Preferably, the end of the probe sleeve located downstream in the gas flow direction is provided with an annular boss that abuts against the probe seat sleeve.

[0007] Preferably, the outer diameter of the probe core is 0.1 to 0.3 micrometers smaller than the inner diameter of the probe sleeve.

[0008] Preferably, the end of the probe head that contacts the battery cell downstream of the gas flow direction has an arc-shaped protrusion; the diameter of the arc-shaped protrusion is 0.5 to 3 mm.

[0009] Preferably, the probe core is a conductive copper rod with gold plating on the outer surface.

[0010] Preferably, the outer diameter of the limiting step is larger than the inner diameter of the probe sleeve and smaller than the inner diameter of the probe seat sleeve.

[0011] Preferably, the outer diameter of the probe head is larger than the inner diameter of the probe sleeve.

[0012] Compared with existing technologies, this invention provides a novel photovoltaic cell IV testing probe with the following advantages: The probe unit is connected inside a probe holder, which can be connected to a gas source. One end of the limiting step on the conductive probe core of the probe unit serves as a pressure-bearing surface, and the gas pressure directly acts on the pressure-bearing surface to drive the displacement of the conductive probe core. The movement of the conductive probe core drives the movement of the probe head, which is used to contact the photovoltaic cell. The probe holder guides the probe core, maintaining the stability of its movement direction. The detachable probe head facilitates probe head replacement. This invention replaces the traditional spring-driven mechanism. Because the gas pressure is stable, even if the downward pressure of the pressure plate on the cell increases, the force of the probe head on the cell will not increase with the downward pressure, thus avoiding contact damage to the cell. Moreover, the pneumatic drive method is more flexible and eliminates the problem of mechanical spring breakage or jamming. Attached Figure Description

[0013] Figure 1This is an isometric schematic diagram of the probe unit of this utility model;

[0014] Figure 2 This is a schematic cross-sectional view of the probe unit of this utility model;

[0015] Figure 3 This is a schematic diagram of the pin array assembly involved in this utility model;

[0016] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0017] Explanation of reference numerals in the attached drawings: 1. Needle array assembly; 2. Circuit interface; 3. Gas pipeline; 4. Probe seat; 41. Airtight cavity; 5. Probe unit; 51. Probe sleeve; 52. Probe core; 53. Probe head; 54. Arc-shaped protrusion; 55. Limiting step; 56. Annular boss. Detailed Implementation

[0018] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model:

[0019] The purpose of this invention is to address the shortcomings of existing technologies and provide a gas-driven non-destructive probe structure, including a probe sleeve 4 and a probe unit 5. The probe sleeve 4 is connected to a gas pipeline 3, which introduces gas into the probe sleeve 4. The probe unit 5 is disposed within the probe sleeve 4 and located downstream of the gas flow direction. The probe unit 5 includes a probe sleeve 51, a probe core 52, and a probe head 53. The probe sleeve 51 is sealed within the probe sleeve 4 and located downstream of the gas flow direction. The sealing is achieved by the outer diameter of the probe sleeve 51 being 0.1 to 0.3 micrometers larger than the inner diameter of the probe sleeve 4, i.e., the probe sleeve 51 is interference-fitted within the probe sleeve 4. The probe core 52 is slidably sealed within the probe sleeve 51, allowing gas from the gas pipeline 3 to enter the probe sleeve 4, and then the gas pushes the probe core 52 to move. The probe core 52 is a conductive copper rod with a gold-plated outer surface. Both ends of the probe core 52 extend outwards from the probe sleeve 51. The upstream end of the probe core 52 in the gas flow direction has a limiting step 55 that abuts against the upper end of the probe sleeve 51. The upstream end face of the limiting step 55 acts as a pressure-bearing surface to receive gas pressure, thus allowing the probe core 52 to move. The downstream end face of the limiting step 55 acts as a limiting surface, abutting against the upper end of the probe sleeve 51 to limit the length of the probe core 52 extending out of the probe sleeve 51. Therefore, in the design, the outer diameter of the limiting step 55 should be larger than the inner diameter of the probe sleeve 51 and smaller than the inner diameter of the probe base sleeve 4. Generally, the outer diameter of the limiting step 55 is 0.1 to 0.3 microns smaller than the inner diameter of the probe base sleeve 4. The downstream end of the probe core 52 has a probe head 53. The outer diameter of the probe head 53 is larger than the inner diameter of the probe sleeve 51 to ensure that the probe head 53 will not retract into the probe sleeve 51. The probe head 53 has an arc-shaped protrusion 54 at its downstream end in the gas flow direction. The diameter of the arc-shaped protrusion 54 is 0.5-3mm. The arc-shaped protrusion 54 is used to contact the battery cell to be tested. The probe holder 4 has an airtight cavity 41 at its upstream end in the gas flow direction. Gas flows into the gas pipeline 3 into the airtight cavity 41. This gas pushes the pressure-bearing surface of the limiting step 55, enabling the probe core 52 to move within the airtight cavity 41 and slide in a sealed manner relative to the probe holder 51. The sealing and sliding is achieved through mechanical engagement. The outer diameter of the probe core 52 is larger than that of the probe holder 51. The inner diameter of the probe sleeve 51 is 0.1 to 0.3 micrometers smaller, which facilitates the fitting of the probe core 52 into the probe sleeve 51. After the fitting is completed, the two can slide relative to each other. Since the outer diameter of the probe core 52 is 0.1 to 0.3 micrometers smaller than the inner diameter of the probe sleeve 51, this dimensional difference can achieve the sealing effect required in the process. It has been verified that the leakage rate is <0.001L / min under 0.5MPa air pressure. The sealing method between the probe core 52 and the probe sleeve 51 is achieved by precision machining of the parts to maintain a certain gap between the parts, allowing the probe core 52 to slide freely without causing air leakage.The probe sleeve 51 has an annular boss 56 at the downstream end in the gas flow direction, which abuts against the probe seat sleeve 4. The annular boss 56 is integrally formed on the probe sleeve 51, and the outer diameter of the annular boss 56 is larger than the inner diameter of the probe seat sleeve 4, so that the annular boss 56 abuts against the bottom end of the probe seat sleeve 4.

[0020] During assembly, with Figure 4 For example, initially, the probe core 52 does not have the probe head 53 installed at its bottom. First, the probe core 52 is inserted downwards into the probe sleeve 51 from above, with the bottom end of the probe core 52 extending out of the probe sleeve 51. Then, the probe head 53 is installed at the bottom end of the probe core 52. The arc-shaped protrusion 54 is integrally formed on the probe head 53. A mounting hole can be provided on the side of the probe head 53 facing away from the arc-shaped protrusion 54. This mounting hole allows the bottom of the probe core 52 to be fitted in before welding to achieve the connection between the probe core 52 and the probe head 53. Alternatively, the side of the probe head 53 facing away from the arc-shaped protrusion 54 can be directly welded to the bottom of the probe core 52 to achieve the connection. The probe core 52 and the probe head 53 can be connected by cold pressing, hot pressing, welding, or threading, etc., and are not limited to one method. Completing the above process completes the assembly of the probe unit 5. Then, the probe unit 5 is installed into the probe seat sleeve 4. Figure 4 In the demonstration position, the probe unit 5 is inserted into the probe holder 4 from below and upward until the annular boss 56 abuts against the bottom end of the probe holder 4. Then, the annular boss 56 is welded to the bottom end of the probe holder 4 to complete the assembly of the probe structure.

[0021] like Figure 3In the illustrated embodiment, the several probe structures that have been connected are connected to the probe array assembly 1. The gas pipeline 3 is connected to a nitrogen source. The upper end of the probe holder 4 is connected to the gas pipeline 3. Simultaneously, the upper part of the probe holder 4 is also electrically connected to the circuit interface 2, which is connected to the IV tester. Since both the probe holder 4 and the probe unit 5 are made of conductive metal, the arc-shaped protrusion 54, after contacting the battery cell, can conduct current through the probe head 53, probe core 52, probe sleeve 51, and probe holder 4 to the IV tester to obtain the required signal. Test Results: When testing is required, circuit interface 2 is connected to the IV tester, and nitrogen gas is introduced into the gas-tight chamber 41 through gas pipeline 3. The nitrogen gas pressure is maintained at a stable level. The battery cell is placed directly on the probe head 53, contacting the arc-shaped protrusion 54. A pressure plate is placed on the battery cell, pressing it down until it reaches approximately halfway through the probe core 52's travel. After the arc-shaped protrusion 54 contacts the battery cell, the current is conducted through the probe head 53, probe core 52, probe sleeve 51, and probe base 4 to the IV tester. When testing is not required, there is no nitrogen gas in gas pipeline 3, and the probe core 52 can be retracted into the probe sleeve 51 to prevent the excessively long probe core 52 from being exposed and accidentally touched. The probe head 53 and the arc-shaped protrusion 54 are integrally formed by thermoforming, and the connection between the probe head 53 and the probe core 52 can be removed. The probe head 53 can be replaced if necessary. The side of the probe 53 that contacts the battery cell can also be other shapes, not limited to the arc-shaped protrusion 54. If the diameter of the probe 53 is much larger than that of the electrode, a conical contact surface is better. If the diameter of the probe 53 is equal to that of the electrode, an arc shape is better. If the diameter of the probe 53 is smaller than that of the electrode, a flat-head shape can be selected. If better contact with the electrode is required, a staggered needle shape can also be used. Arc-shaped protrusion 54, conical, flat-head, and staggered needle shapes are all types of probes for testing battery cells.

[0022] This novel probe structure replaces the traditional spring probe. The probe core 52 is a conductive copper rod, made of gold-plated copper, reducing weight by 70% by eliminating the spring structure. The pressure-bearing surface of the upper limiting step 55 converts the pneumatic thrust into the displacement of the probe core 52. The integrally formed arc-shaped protrusion 54 of the probe head 53 disperses contact stress, eliminates the risk of damage, and enhances conductivity. The probe head 53 is used to contact the photovoltaic cell, the conductive probe core 52 is used for vertical movement, and the probe sleeve 51 guides the probe core 52 to maintain its vertical vertical movement. The probe sleeve 51 can be a double-layered metal sleeve, with an airtight cavity 41 at the top (the location of the upper part depends on the probe's testing direction; if the probe is testing from bottom to top and the cell is on top, it is at the bottom; if the cell is on the bottom and the probe is on top, it is at the top). This novel structure can achieve a vertical guiding accuracy of 0.001mm. Nitrogen gas, after passing through the gas pipeline 3 and the airtight cavity 41, acts on the pressure-bearing surface of the limiting step 55, thus pushing the probe core 52 to extend vertically. Traditional spring-driven probes will pop out suddenly, and the impact force at the moment of popping out can easily cause impact damage to the surface of the battery cell; while the pneumatic-driven probe is more flexible and the probe core 52 will not pop out suddenly, thus avoiding impact damage to the surface of the battery cell.

[0023] The results of the test comparison between this invention and the traditional spring probe are as follows:

[0024] Experimental data: The structure of this invention was continuously tested 100,000 times on a 130μm thick BC solar cell under a pressure of 0.5Mpa.

[0025]

[0026]

[0027] Compared with existing technologies, this invention solves the problem of contact damage to the photovoltaic cell contact area caused by repeated pressing of the spring probe head, and the problem of insufficient testing stability. It improves measurement stability, reduces the damage rate, increases maintenance efficiency, and saves costs. The pneumatic drive combined with the arc-shaped protrusion of the probe head stabilizes the contact pressure between the probe head and the cell at 0.03 N / mm². 2 This pressure is only 1 / 6 of that of a spring probe, solving the problem that with ordinary spring probes, the deeper the probe is pressed, the greater the pressure between the probe head and the cell surface, causing surface damage or internal microcracks. The air pressure adjustment range is 0.1-1.0MPa, and the probe head extension force is controllable between 0.005-0.09N / mm. 2 It can adapt to battery cells of different thicknesses.

[0028] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A novel photovoltaic cell IV detection probe, characterized in that: The device includes a probe holder (4) connecting to a gas pipeline (3) and a probe unit (5) disposed within the probe holder (4). The probe unit (5) includes a probe sleeve (51), a probe core (52), and a probe head (53). The probe sleeve (51) is sealed and connected within the probe holder (4) and is located downstream in the gas flow direction. The probe core (52) is sealed and slidably connected within the probe sleeve (51), with both ends of the probe core (52) extending beyond both ends of the probe sleeve (51). The probe core (52) is located upstream in the gas flow direction. One end is provided with a limiting step (55) that can abut against the probe sleeve (51), and the probe core (52) is provided with a probe head (53) at the downstream end in the gas flow direction; the outer diameter of the probe head (53) is larger than the inner diameter of the probe sleeve (51) and the downstream end of the probe head (53) is in contact with the battery cell; the probe seat sleeve (4) is provided with an airtight cavity (41) at the upstream end in the gas flow direction, and the probe core (52) can move in the airtight cavity (41) and slide in a sealed manner relative to the probe sleeve (51).

2. The novel photovoltaic cell IV detection probe according to claim 1, characterized in that: The probe sleeve (51) has an annular boss (56) at the downstream end in the gas flow direction that abuts against the probe seat sleeve (4).

3. The novel photovoltaic cell IV detection probe according to claim 1, characterized in that: The outer diameter of the probe core (52) is 0.1 to 0.3 mil smaller than the inner diameter of the probe sleeve (51).

4. The novel photovoltaic cell IV detection probe according to claim 1, characterized in that: The probe head (53) is located downstream of the gas flow direction and has an arc-shaped protrusion (54) at the end that contacts the battery cell; the diameter of the arc-shaped protrusion (54) is 0.5 to 3 mm.

5. The novel photovoltaic cell IV detection probe according to claim 1, characterized in that: The probe core (52) is a conductive copper rod with gold plating on its outer surface.

6. The novel photovoltaic cell IV detection probe according to claim 3, characterized in that: The outer diameter of the limiting step (55) is larger than the inner diameter of the probe sleeve (51) and smaller than the inner diameter of the probe seat sleeve (4).

7. The novel photovoltaic cell IV detection probe according to claim 6, characterized in that: The outer diameter of the probe head (53) is larger than the inner diameter of the probe sleeve (51).

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