A non-contact type IV detection device for battery piece

Abstract

The utility model discloses a kind of battery piece non-contact IV detection devices, comprising: conveying module, for conveying battery piece to detection station, including feeding suction disc and conveying belt;Non-contact signal acquisition module, including several circular contact points arranged on contact point moving platform;The circular contact point is spaced 1-2mm with battery piece measuring point, and its top generates 1-2mm electron beam when working, with the positive and negative electrode of battery piece in non-contact mode and gathers electric signal;Positioning module, including positioning camera and contact point moving platform, the positioning camera is used to identify battery piece position and adjust the position of circular contact point by contact point moving platform;Light source module provides analog light for battery piece to make battery piece produce photovoltaic effect;Signal processing module is used to analyze the electric signal and output IV test data.Compared with existing battery piece detection system, the utility model simplifies test tooling, and optimizes mechanical structure.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a non-contact IV detection device for battery cells. Background Technology

[0002] BC batteries, or back-contact batteries, are a type of battery structure where all electrodes are located on the back of the cell. The positive and negative electrodes of a BC battery are alternately distributed on the back of the cell, with strict physical isolation between them to prevent short circuits caused by conduction at the negative electrode. Key features include: no grid lines obstructing the front of the cell, increasing the light-receiving area and thus improving efficiency; and no soldering on the front of the cell during module packaging, resulting in a more aesthetically pleasing appearance.

[0003] IV testing of solar cells is used to evaluate their performance. The testing machine uses fixtures to clamp the solar cells and connects them via probes. These probes are connected to the positive and negative terminals to measure current or voltage. The IV testing machine collects the test data to calculate the cell's electrical performance. Therefore, during testing, the fixtures must accurately clamp the solar cells; otherwise, the probes may not be properly aligned when connected to the cells, affecting the testing process and potentially causing damage to the probes due to accidental contact.

[0004] Current voltage testing of solar cells requires a probe to contact the cell to form an electrical circuit. This necessitates using a probe or a metal plate to connect the cell and obtain the open-circuit voltage across the positive and negative terminals. This method is not suitable for testing fully junction cells and is also difficult to test other non-finished cell samples. Furthermore, the current measurement method requires a separate station for the probe to press down and contact the cell for measurement, which is time-consuming and complex.

[0005] Traditional testing methods, which use physical probes to contact the positive and negative terminals of the solar cell to form an electrical circuit (such as the contact scheme between the pressure pin 364 and the test circuit board 333 in CN119176375A), have significant drawbacks:

[0006] 1. Risk of mechanical damage: Pressing down with the probe can easily cause microcracks or breakage of brittle solar cells;

[0007] 2. Limited testing accuracy: Misalignment between the probe and the grid line can easily cause poor contact, affecting the accuracy of the current / voltage signal;

[0008] 3. Efficiency bottleneck: The probe raising and lowering action takes a long time, with a single CT test taking ≥0.85 seconds;

[0009] 4. Limited applicability: It is difficult to adapt to high-precision electrode structures such as full back junction batteries (BC batteries).

[0010] Although existing technologies, such as CN119176375A, employ flexible clamping modules and dual-vision positioning to optimize contact accuracy, they still rely on physical contact for conduction and cannot completely eliminate the aforementioned problems. Therefore, there is an urgent need for a non-contact, wear-free, and highly efficient IV testing solution. Utility Model Content

[0011] The technical problem to be solved by this utility model is to provide a non-contact IV testing device for battery cells, which can simplify the testing tooling and optimize the mechanical structure.

[0012] To solve the above-mentioned technical problems, this utility model discloses a non-contact IV detection device for battery cells, comprising:

[0013] The conveying module, used to transport battery cells to the testing station, includes a feeding suction cup and a conveyor belt;

[0014] The non-contact signal acquisition module includes several circular contact points set on a contact moving platform; the circular contact points are spaced 1-2 mm apart from the battery cell measurement points, and generate an electron beam of 1-2 mm at their top during operation, which conducts to the positive and negative terminals of the battery cell in a non-contact manner and acquires electrical signals.

[0015] The positioning module includes a positioning camera and a contact point moving platform. The positioning camera is used to identify the position of the battery cell and the contact point moving platform is used to adjust the position of the circular contact point.

[0016] The light source module provides simulated illumination to the solar cells to enable them to produce the photovoltaic effect.

[0017] The signal processing module is used to analyze the electrical signal and output IV test data.

[0018] As an optional implementation, the electron beam at the circular contact point corresponds to the positive and negative measurement points of the back junction cell, and is used for non-contact conduction of the positive and negative electrodes of the cell.

[0019] As another alternative implementation, the contact moving platform adjusts the position of the circular contact point on the horizontal plane to match the battery cell measurement point without performing any upward or downward pressing actions.

[0020] As another optional implementation, the light source module is a xenon lamp or an LED array, and the irradiation intensity is adjustable.

[0021] As another alternative implementation, the battery cell is a full back junction battery.

[0022] As another alternative implementation, the detection device performs the detection in a vacuum environment.

[0023] As another alternative implementation, a miniature field emission cathode array is integrated on the top of the circular contact point for electron beam emission.

[0024] As another alternative implementation, a Faraday cup collector is provided at the bottom of the circular contact point to capture the electron beam and convert it into an electric current signal.

[0025] Compared with the prior art, the embodiments of this utility model have the following beneficial effects:

[0026] This utility model embodiment is based on non-contact conduction through a 1-2mm electron beam at a circular contact point, eliminating the risk of microcracks caused by traditional probe pressing; by omitting the probe pressing / rebound action, the test tooling is simplified, and the test CT time can be significantly reduced, thereby increasing production capacity; the non-contact design supports testing of full back junction batteries and other vulnerable samples. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a non-contact IV detection device for battery cells disclosed in an embodiment of this utility model;

[0029] Figure 2 This is another structural schematic diagram of a non-contact IV detection device for battery cells disclosed in an embodiment of this utility model. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] See Figures 1-2 This utility model discloses a non-contact IV detection device for battery cell A, comprising:

[0032] The conveying module, used to transport battery cell A to the testing station, includes a feeding suction cup 1 and a conveyor belt 2;

[0033] The non-contact signal acquisition module includes several circular contact points 41 disposed on the contact moving platform 4; the circular contact points 41 are spaced 1-2 mm apart from the measurement points of the battery cell A, and generate an electron beam of 1-2 mm at their top during operation, so as to conduct and acquire electrical signals with the positive and negative terminals of the battery cell A in a non-contact manner.

[0034] The positioning module includes a positioning camera 3 and a contact moving platform 4, which is used to identify the position of the battery cell A and adjust the position of the circular contact point 41 through the contact moving platform 4;

[0035] Light source module 5 provides simulated illumination to solar cell A to enable solar cell A to produce a photovoltaic effect;

[0036] A signal processing module (not shown in the attached figure) is used to analyze the electrical signal and output IV test data.

[0037] In this embodiment, the feeding suction cup 1 is used to convey the battery cell A to the conveyor belt 2; the positioning camera 3 is used to photograph and position the battery cell A. After positioning, the contact moving platform 4 adjusts its X-axis and Y-axis positions accordingly, aligning the circular contact point 41 with the measurement point position of the battery cell A; the light source provides light energy to the battery cell A; the distance between the circular contact point 41 and the battery cell A is 1mm-2mm. In working mode, the circular contact point 41 only undergoes minor adjustments to its X-axis and Y-axis positions for positioning the battery cell A. When the circular contact point 41 is working, a 1mm-2mm electron beam is generated at the top of the contact point. The electron beam corresponds to the positive and negative measurement points of the battery cell. When the light source illuminates the battery cell A, the positive and negative electrodes on the back of the battery cell A will generate current and voltage. The electron beam at the top of the circular contact point 41 conducts the positive and negative electrodes of the battery cell A. The voltage and current signals are then processed and analyzed to obtain test data. The entire process is as follows: the feeding suction cup 1 conveys the battery cell A to the conveyor belt 2; after being positioned by the positioning camera 3, the battery cell A is conveyed to the measurement position; after being illuminated by the light source, the cylindrical contact collects the signal and transmits the signal to the processor; the conveyor belt 2 then conveys the battery cell A to the next position. Compared with the current TOPCon, HJT, and BC battery measurement methods, this utility model embodiment eliminates the probe pressing and lowering process, simplifies the testing fixture, and reduces the replacement of probes and probe arrays, thus reducing costs and increasing efficiency; at the same time, it reduces the time required for testing; the existing test CT time is at most 0.85 seconds / test (including the time for probe pressing, probe rebound, and simulated sunlight exposure), while the CT time of this utility model testing mechanism can reach 0.2 seconds / test, significantly increasing production capacity.

[0038] This utility model embodiment is based on a circular contact point 41 through a 1-2mm electron beam non-contact conduction, eliminating the risk of microcracks caused by traditional probe pressing; by omitting the probe pressing / rebound action, the test tooling is simplified, the test CT time can be significantly reduced, thereby increasing production capacity; the non-contact design supports the testing of full back junction batteries and other vulnerable samples.

[0039] In an optional embodiment, the electron beam at the circular contact point 41 corresponds to the positive and negative measurement points of the back junction cell, used for non-contact connection of the positive and negative electrodes of cell A. The electron beam and electrode positions are dynamically matched, avoiding test errors caused by traditional probe positioning deviations.

[0040] In another optional embodiment, the contact moving platform 4 adjusts the position of the circular contact point 41 on the horizontal plane to match the measurement point of the battery cell A, without performing any upward or downward pressing action. This eliminates the probe lifting mechanism, simplifying the structure.

[0041] In another optional embodiment, the light source module is a xenon lamp or an LED array with adjustable illumination intensity.

[0042] In another optional embodiment, the solar cell A is a full back junction cell. The non-contact conduction scheme solves the problem of probe misalignment caused by the high-density electrode distribution of full back junction cells.

[0043] In yet another optional embodiment, a tray 6 for holding the battery cells is also included.

[0044] In another alternative embodiment, the conveyor belts 2 are arranged in two parallel sections, with the belt portions of the two conveyor belts 2 respectively contacting both sides of the battery cell to expose the electrode portion in the middle.

[0045] In yet another alternative embodiment, the detection device performs the detection in a vacuum environment. The vacuum environment prevents gas ionization from interfering with the electron beam, ensuring accurate current acquisition.

[0046] In yet another alternative embodiment, a miniature field emission cathode array is integrated on top of the circular contact point 41 for electron beam emission.

[0047] In another alternative embodiment, the bottom of the circular contact point 41 is provided with a Faraday cup collector for capturing the electron beam and converting it into an electric current signal.

[0048] Optionally, a negative high-voltage generator may also be included for outputting an adjustable DC voltage from -1kV to -5kV, which controls the electron beam length (to match a 1-2mm distance) via pulse width modulation (PWM).

[0049] Optionally, a transimpedance amplifier (TIA) may also be included to convert the microcurrent captured by the Faraday cup collector into a voltage signal.

[0050] The contents disclosed in this utility model embodiment are merely preferred embodiments of this utility model and are only used to illustrate the technical solutions of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A non-contact IV detection device for battery cells, characterized in that, include: The conveying module, used to transport battery cells to the testing station, includes a feeding suction cup and a conveyor belt; The non-contact signal acquisition module includes several circular contact points set on a contact moving platform; the circular contact points are spaced 1-2 mm apart from the battery cell measurement points, and generate an electron beam of 1-2 mm at their top during operation, which conducts to the positive and negative terminals of the battery cell in a non-contact manner and acquires electrical signals. The positioning module includes a positioning camera and a contact point moving platform. The positioning camera is used to identify the position of the battery cell and the contact point moving platform is used to adjust the position of the circular contact point. The light source module provides simulated illumination to the solar cells to enable them to produce the photovoltaic effect. The signal processing module is used to analyze the electrical signal and output IV test data.

2. The apparatus according to claim 1, characterized in that, The electron beam at the circular contact point corresponds to the positive and negative measurement points of the back junction battery, and is used for non-contact conduction of the positive and negative electrodes of the battery cell.

3. The apparatus according to claim 1, characterized in that, The contact moving platform adjusts the position of the circular contact point on the horizontal plane to match the battery cell measurement point without performing any upward or downward pressing actions.

4. The apparatus according to claim 1, characterized in that, The light source module is a xenon lamp or an LED array, and the irradiation intensity is adjustable.

5. The apparatus according to claim 1, characterized in that, The battery cell is a full back junction battery.

6. The apparatus according to claim 1, characterized in that, The detection device performs the detection in a vacuum environment.

7. The apparatus according to claim 1, characterized in that, The top of the circular contact point is integrated with a miniature field emission cathode array for electron beam emission.

8. The apparatus according to claim 1, characterized in that, The bottom of the circular contact point is equipped with a Faraday cup collector for capturing the electron beam and converting it into an electric current signal.

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