Battery testing device and testing method

Abstract

The invention provides a battery testing device and method, and the device comprises a top electrode assembly which is used for being in contact conduction with a top point of a to-be-tested battery, and the top electrode assembly comprises a first contact surface which is used for being attached to the to-be-tested battery; the bottom electrode assembly is used for being in contact conduction with a bottom point position of a to-be-tested battery, the bottom electrode assembly comprises a second contact surface used for being attached to the to-be-tested battery, and test point positions corresponding to printing contacts of the to-be-tested battery are distributed on the first contact surface; a containing space is formed between the top electrode assembly and the bottom electrode assembly, and the top electrode assembly and the bottom electrode assembly are each provided with a test interface used for being connected with an external test device. Surface contact with a to-be-tested battery is realized through the flexible contact surfaces on the top electrode assembly and the bottom electrode assembly, so that nondestructive testing is realized; test point positions can be designed according to printing contacts of different batteries, the whole assembly does not need to be replaced, and various battery types can be adapted; the structure is simple and operation is convenient.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery testing device and testing method. Background Technology

[0002] The development of photovoltaic technology has driven the widespread application of large-area thin-film batteries such as crystalline silicon and perovskite tandem in new energy and other fields, making their electrical performance testing crucial.

[0003] Existing battery testing equipment is complex in structure, easily damages batteries, and has poor compatibility, which affects testing efficiency and accuracy. Summary of the Invention

[0004] In view of this, the present invention proposes a battery testing device and testing method, the specific scheme of which is as follows:

[0005] In its first part, the present invention provides a battery testing device, the device comprising:

[0006] A top electrode assembly is used to make contact with the top point of the battery under test. The top electrode assembly includes a first contact surface for bonding with the battery under test. Test points corresponding to the printed contacts of the battery under test are distributed on the first contact surface.

[0007] A bottom electrode assembly is used to make contact with a bottom point of the battery under test, and the bottom electrode assembly includes a second contact surface for bonding with the battery under test;

[0008] The top electrode assembly and the bottom electrode assembly form a receiving space for placing the battery under test, and the top electrode assembly and / or the bottom electrode assembly are respectively provided with at least one test interface for connecting an external test device.

[0009] In an optional embodiment, the device further includes a pressure fixing component located on the side of the top electrode assembly away from the bottom electrode assembly, the pressure fixing component being used to apply a downward pressure toward the bottom electrode assembly to the top electrode assembly, thereby causing the top electrode assembly to fit tightly against the battery under test.

[0010] In an optional embodiment, the pressure fixing assembly includes a third contact surface for engaging with the top electrode assembly, the third contact surface having flexible contacts distributed to match the top electrode assembly.

[0011] In an optional embodiment, the pressure fixing component is made of high-transparency quartz glass, and the light transmittance of the pressure fixing component is ≥90%.

[0012] In an optional embodiment, the top electrode assembly includes a middle portion and a busbar portion, the middle portion being used to make contact with the battery under test and to conduct current to the busbar portion, and the busbar portion being used to make contact with the bottom electrode assembly.

[0013] In an optional embodiment, a limiting groove for limiting the battery under test is provided on the side of the bottom electrode assembly facing the top electrode assembly.

[0014] In an optional embodiment, the material of the first contact surface includes a gold-plated copper surface, and the material of the second contact surface includes a gold-plated copper surface.

[0015] In an alternative embodiment, the top electrode assembly includes at least a flexible structure.

[0016] In an optional embodiment, an insulating portion is provided on the side of the bottom electrode assembly away from the top electrode assembly.

[0017] In the second part, this invention proposes a battery testing method, the method comprising:

[0018] Place the battery under test in the limiting groove of the bottom electrode assembly so that the bottom of the battery under test is in full contact with the bottom electrode assembly;

[0019] Align the top electrode assembly with the printed contacts on the top of the battery under test so that the test points of the top electrode assembly make corresponding contact with the printed contacts of the battery under test;

[0020] Pressure is applied to the top electrode assembly through the flexible contacts of the pressure fixing component to ensure that the top electrode assembly is in close contact with the battery under test;

[0021] External testing equipment can be connected via the test interface on the top electrode assembly and / or the bottom electrode assembly.

[0022] Beneficial effects:

[0023] This invention achieves surface contact with the battery under test through flexible contact surfaces on the top and bottom electrode assemblies, enabling non-destructive testing. Furthermore, the test points on the top and bottom electrode assemblies can be designed according to the printed contacts of different batteries, eliminating the need to replace the entire assembly and adapting to various battery types. The structure is simple and the operation is convenient. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the battery testing device according to an embodiment of the present invention;

[0025] Figure 2 This is a three-dimensional structural schematic diagram of the top electrode assembly according to an embodiment of the present invention;

[0026] Figure 3 This is a three-dimensional structural schematic diagram of the bottom electrode assembly according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic flowchart of the battery testing method according to an embodiment of the present invention.

[0028] Reference numerals: 1-Top electrode assembly; 10-First contact surface; 11-Middle part; 12-Chumbnail part; 2-Bottom electrode assembly; 20-Second contact surface; 21-Limiting groove; 22-Insulating part; 3-Pressure fixing assembly; 30-Third contact surface. Detailed Implementation

[0029] In the following, various embodiments of the invention will be described more fully. The invention may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the invention to the specific embodiments disclosed herein, but rather the invention should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments disclosed herein.

[0030] The terminology used in the various embodiments disclosed herein is for the purpose of describing particular embodiments only and is not intended to limit the various embodiments disclosed herein. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments disclosed herein pertain. The terms (such as those defined in commonly used dictionaries) are to be interpreted as having the same meaning as in the context of the relevant technical field and are not to be interpreted as having an idealized or overly formal meaning, unless clearly defined in the various embodiments disclosed herein.

[0031] Example 1

[0032] This embodiment presents a battery testing device, as shown in the attached instruction manual. Figure 1 As shown, the device includes:

[0033] The top electrode assembly 1 is used to make contact with the top point of the battery under test. The top electrode assembly 1 includes a first contact surface 10 for bonding with the battery under test. Test points corresponding to the printed contacts of the battery under test are distributed on the first contact surface 10.

[0034] Bottom electrode assembly 2 is used to make contact with the bottom point of the battery under test, and the bottom electrode assembly 2 includes a second contact surface 20 for bonding with the battery under test;

[0035] The top electrode assembly 1 and the bottom electrode assembly 2 form a receiving space for placing the battery under test, and the top electrode assembly 1 and / or the bottom electrode assembly 2 are respectively provided with at least one test interface for connecting an external test device.

[0036] Specifically, the top electrode assembly 1 is used to make contact with the top point of the battery under test, thereby enabling the lead-out of the top electrode. The top electrode assembly 1 includes a first contact surface 10 for bonding with the battery under test. The first contact surface 10 can be made of gold-plated copper and has an overall flexible design. Copper, as a good conductor of electricity, can ensure stable current transmission and reduce resistance loss, thereby ensuring the accuracy of electrical parameters such as current and voltage during the test. The overall flexibility of the first contact surface 10 can avoid mechanical damage when in contact with the battery, providing good protection for the battery and enabling non-destructive testing. Furthermore, the contact between the first contact surface 10 and the battery is a surface contact, which, compared to the point contact of traditional probes, can conduct current more evenly, reduce the possibility of poor contact, and make the test results more reliable.

[0037] Furthermore, the top electrode assembly 1 can be patterned one-to-one with the printed contacts of different batteries under test, thus being compatible with various types of batteries such as crystalline silicon batteries and crystalline silicon perovskite tandem batteries. The first contact surface 10 is patterned to correspond one-to-one with the printed contacts of the battery under test (such as crystalline silicon batteries or perovskite tandem batteries), achieving surface contact conduction.

[0038] The bottom electrode assembly 2 is used to make contact with the bottom point of the battery under test, leading out the bottom electrode. The bottom electrode assembly 2 includes a second contact surface 20 for adhering to the battery under test. The second contact surface 20 contacts the surface of the battery under test, thereby achieving a stable and reliable electrical connection. The second contact surface 20 is made of gold-plated copper, and its shape and thickness can be adjusted according to the battery size. Its area is larger than that of the battery sheet, ensuring full contact at the bottom. The second contact surface 20 is designed with a conductive structure that matches the bottom electrode of the battery, directly contacting the bottom of the battery to lead out the bottom electrode. Furthermore, a limiting groove 21 is provided on the side of the bottom electrode assembly 2 facing the top electrode assembly 1 for limiting the battery under test, so as to accurately place the battery under test and avoid displacement during the test. The top electrode assembly 1 and the bottom electrode assembly 2 form a receiving space for placing the battery under test, which not only ensures the stable placement of the battery, but also facilitates the installation and removal of the battery by the operator.

[0039] Furthermore, at least one test interface is provided on the top electrode assembly 1 and / or the bottom electrode assembly 2 for connecting to external testing devices (such as multimeters or efficiency testers). The test interfaces adopt a standardized design, facilitating quick connection with various testing instruments and improving testing efficiency. Specifically, a four-wire method can be used, with current and voltage lines led out through the top planar electrode and the bottom gold-plated copper base, respectively, reducing the influence of contact resistance on the test results.

[0040] In an optional embodiment, the device further includes a pressure fixing component 3 located on the side of the top electrode assembly 1 away from the bottom electrode assembly 2. The pressure fixing component 3 is used to apply a downward pressure toward the bottom electrode assembly 2 to the top electrode assembly 1, thereby making the top electrode assembly 1 fit tightly against the battery under test.

[0041] The pressure fixing component 3 applies a stable downward pressure to the top electrode component 1 to ensure that the top electrode component 1 is in close contact with the battery under test, thereby improving the test accuracy.

[0042] Specifically, the pressure fixing component 3 can be made of high-transparency quartz glass with a light transmittance of ≥90%, ensuring that light can fully penetrate during the test and reducing the impact of light shading on the test results. It also possesses excellent mechanical strength and chemical stability, enabling it to withstand pressure for extended periods without deformation or damage. The high-transparency quartz glass material, combined with the ultra-thin design of the top electrode component 1 (approximately 0.1mm thick), minimizes the obstruction of incident light, making it suitable for collimated or diffused light testing environments.

[0043] Furthermore, the pressure fixing component 3 is provided with a third contact surface 30 that matches the top electrode component 1. Flexible contacts corresponding to the pattern on the first contact surface 10 are attached to the third contact surface 30. These flexible contacts can be designed with a strip-shaped or droplet-shaped elastic structure, made of elastic materials such as silicone or rubber, and can deform when pressure is applied. This ensures a tight and undamaged contact between the top electrode component 1 and the printed contacts of the battery under test, and allows the downward pressure to be evenly distributed across the entire contact surface, avoiding battery damage or poor contact caused by excessive local pressure. The flexible contacts on the third contact surface 30 can be arranged according to the printed contact patterns of different batteries without replacing the entire component, improving the device's compatibility with different types of batteries such as crystalline silicon batteries and perovskite batteries.

[0044] During testing, the pressure fixing component 3 applies a stable and adjustable downward pressure to the top electrode assembly 1 via a precision mechanical structure (such as a spring, screw, or pneumatic device). This downward pressure causes the flexible contacts to deform and fit tightly against the printed contacts of the top electrode assembly 1 and the battery under test, thereby ensuring the stability and reliability of the electrical connection. Simultaneously, the use of high-transparency quartz glass reduces the impact of light shading on the test results, improving the accuracy and repeatability of the test.

[0045] In an optional embodiment, as shown in the appendix to the specification... Figure 2 As shown, the top electrode assembly 1 includes a middle part 11 and a current-collecting part 12. The middle part 11 is used to make contact with the battery under test and conduct electricity to the current-collecting part 12. The current-collecting part 12 is used to make contact with the bottom electrode assembly 2.

[0046] The middle section 11 is the core area of ​​the top electrode assembly 1 that directly contacts and conducts with the top points of the battery under test. It is responsible for collecting the current generated by the battery and channeling it to the current collector 12. The contact surface of the middle section 11 adopts a highly patterned gold-plated copper surface design, and its pattern perfectly matches the printed contact layout on the top of the battery under test, ensuring that each contact can achieve precise one-to-one contact. This not only improves the stability of the contact but also avoids the mechanical damage that may be caused by traditional probe contact.

[0047] The intermediate section 11 is made entirely of flexible materials, such as silicone or elastic metal sheets, which can adapt to battery surfaces of different shapes and sizes while maintaining good conductivity, ensuring tight and uniform contact. Furthermore, the intermediate section 11 is designed with efficient current collection paths, which quickly converge the current generated at various points on the battery to the current collection section 12, reducing current loss during transmission and improving the accuracy of testing.

[0048] The busbar 12 is a critical area in the top electrode assembly 1 used to receive current from the intermediate section 11 and further conduct it to the bottom electrode assembly 2, ensuring the integrity and stability of the test circuit. Specifically, the busbar 12 can be made of a wide conductive material, such as a gold-plated copper plate, with its width and thickness optimized to withstand the large current from the intermediate section 11 without overheating or voltage drop, ensuring the stability and efficiency of the current during the merging process. Furthermore, the contact surface of the busbar 12 can be specially treated (such as gold or silver plating) to improve its conductivity and corrosion resistance. Simultaneously, its surface is designed with contact points that match the bottom electrode assembly 2, ensuring tight contact and stable conduction. The size and shape of the busbar 12 can be adjusted according to the interface requirements of the test equipment to ensure stable connection with external circuitry while avoiding obstruction of the contact area between the intermediate section 11 and the battery, thus ensuring the integrity of the battery's light-receiving area.

[0049] Furthermore, the bottom electrode assembly 2 includes a busbar, and the busbar 12 contacts the busbar to connect to an external testing device.

[0050] Specifically, the busbar is a conductive component integrated on the bottom electrode assembly 2. Made of copper, which possesses excellent conductivity and stability, it effectively reduces losses during current transmission, ensuring the accuracy of the test signal. Its main function is to centrally collect and aggregate the current conducted by the top electrode assembly 1, forming a stable current output node.

[0051] The busbar 12 forms physical contact with the busbar copper platform of the bottom electrode assembly 2 (e.g., direct bonding or elastic pressing), which not only ensures the current conduction between the top electrode assembly 1 and the bottom electrode assembly 2, but also realizes the directional transmission of current from "battery under test → middle part of top electrode 11 → busbar 12 → bottom electrode assembly 2" through the precise docking of the busbar 12 and the busbar copper platform.

[0052] In practical applications, the edges of the busbar 12 can be wrapped with insulating material to prevent current leakage or short circuits. Simultaneously, its surface can be covered with a protective layer to prevent physical damage or chemical corrosion during testing.

[0053] During testing, the current generated by the battery under test is first precisely collected through the patterned contact surface of the intermediate section 11, and then rapidly converges to the current collection section 12 along the designed current collection path inside the intermediate section 11. The current collection section 12 then further conducts the converged current to the bottom electrode assembly 2, thus completing the construction of the entire test circuit. This not only improves the accuracy and stability of the test, but also simplifies the test process and increases test efficiency. In addition, the application of flexible materials and the patterned contact surface design of the intermediate section 11, as well as the wide conductive material and optimized contact surface design of the current collection section 12, enable this device to adapt to solar cells of different sizes and types, further enhancing the compatibility and wide applicability of the test. The integrated design of the intermediate section 11 and the current collection section 12 reduces the number of current transmission nodes and lowers the contact resistance, making current conduction more efficient during the test, especially suitable for current extraction from large-area solar cells.

[0054] In an optional embodiment, as shown in the appendix to the specification... Figure 3As shown, a positioning groove 21 for positioning the battery under test is provided on the side of the bottom electrode assembly 2 facing the top electrode assembly 1. The size of the positioning groove 21 is adapted to the shape of the battery under test (such as a crystalline silicon battery or a perovskite tandem battery), and its depth is usually designed to be slightly less than the battery thickness. This ensures stable placement of the battery and prevents it from shifting due to external force or contact pressure during testing, while also maintaining the contact conductivity between the top electrode assembly 1 and the top of the battery. Furthermore, the edges of the positioning groove 21 can be rounded to avoid sharp corners scratching the battery edges, further enhancing the protection of the battery.

[0055] In an optional embodiment, the first contact surface 10 is made of gold-plated copper, and the second contact surface 20 is also made of gold-plated copper. The gold-plated copper surface of the first contact surface 10 is patterned to correspond one-to-one with the printed contacts on the top of the battery under test, achieving efficient current conduction through surface contact. The gold-plated copper surface of the second contact surface 20 is an integral structure with an area larger than the bottom of the battery, ensuring full contact and conductivity with the bottom of the battery. The gold plating not only enhances the conductivity and oxidation resistance of the contact surface, extending the component's lifespan, but also reduces contact resistance, improves the accuracy of test data, and is compatible with the testing needs of various battery types, including crystalline silicon cells and perovskite tandem cells.

[0056] In an optional embodiment, the top electrode assembly 1 at least partially comprises a flexible structure. For example, the planar electrode is made entirely of a flexible conductive material, allowing it to better conform to the subtle undulations of the battery surface when in contact, ensuring a tight surface contact. This avoids the localized scratches caused by uneven contact pressure of traditional rigid probes or electrodes, making it particularly suitable for battery types with fragile surfaces such as perovskite tandem cells, effectively enabling non-destructive testing. Simultaneously, the flexible structure can adapt to batteries of different thicknesses or with minor deformations, improving compatibility and stability during testing.

[0057] In an optional embodiment, an insulating portion 22 is provided on the side of the bottom electrode assembly 2 away from the top electrode assembly 1. The insulating portion 22 may be made of insulating material (such as plastic, ceramic, etc.) to isolate the bottom electrode assembly 2 from the external test platform or other conductive components, preventing current leakage or external electromagnetic interference from affecting the accuracy of the test results. In addition, the insulating portion 22 can also provide structural support for the bottom electrode assembly 2, enhance the stability of the overall device, and avoid safety hazards to operators caused by accidental conductivity of the bottom electrode, especially when performing high voltage or high current tests, further improving operational safety.

[0058] Example 2

[0059] This embodiment proposes a battery testing method, as shown in the appendix to the instruction manual. Figure 4As shown, the method includes:

[0060] Place the battery under test (BUT) into the limiting groove of the bottom electrode assembly, ensuring full contact between the bottom of the BUT and the bottom electrode assembly. Smoothly place the BUT (such as a crystalline silicon battery or a perovskite tandem battery) into the limiting groove of the bottom electrode assembly. The size of the limiting groove should precisely match the shape of the battery to prevent displacement during testing. During placement, ensure that the bottom of the battery is in full contact with the gold-plated copper surface (second contact surface) of the bottom electrode assembly to guarantee stable conduction of the bottom electrode and lay the foundation for subsequent current transmission.

[0061] Align the top electrode assembly with the printed contacts on the top of the battery under test, so that the test points of the top electrode assembly correspond to the printed contacts of the battery under test; align the test points (first contact surface) of the top electrode assembly with the printed contacts on the top of the battery under test one-to-one. The contact surface of the top electrode assembly is made of gold-plated copper and is patterned to adapt to the contact arrangement of different batteries, achieving conductive connection with the top of the battery through surface contact. For crystalline silicon perovskite tandem batteries, the top electrode assembly can directly contact the perovskite active layer without additional solder wires, avoiding damage to the sensitive layer.

[0062] Pressure is applied to the top electrode assembly via the flexible contacts of the pressure fixing component to ensure a tight fit between the top electrode assembly and the battery under test. A pressure fixing component (high-transparency quartz glass plate) is placed over the top electrode assembly, with its bottom flexible contacts (strip-shaped or droplet-shaped elastic structures) contacting the surface of the top electrode assembly. Downward pressure is applied by the weight of the plate itself or by an external adjustment structure, causing the flexible contacts to deform and tightly fit the top electrode assembly against the battery's printed contacts, reducing contact resistance and ensuring stable current conduction. The pressure can be flexibly adjusted according to the battery type to avoid damaging the battery due to excessive pressure.

[0063] External testing devices are connected via the test interfaces on the top electrode assembly and / or the bottom electrode assembly. External testing equipment (such as an efficiency meter, multimeter, etc.) is connected using a four-wire method through the test interfaces on the top and bottom electrode assemblies. The current-carrying section of the top electrode assembly leads the current from the middle section, while the bottom electrode assembly leads the bottom current through a gold-plated copper electrode plate, enabling precise measurement of electrical parameters such as battery efficiency, current, voltage, and resistance. During testing, the high light transmittance of the high-transmittance quartz glass pressure plate reduces the obstruction of incident light, adapting to collimated or diffused light environments and ensuring the accuracy of test results.

[0064] This method has a simple operation process, requires no complicated welding or mechanical adjustment, and can achieve non-destructive testing of different types of batteries, effectively solving the problems of severe light shading, cumbersome operation, and easy damage to batteries in traditional testing schemes.

[0065] This invention achieves surface contact with the battery under test through flexible contact surfaces on the top and bottom electrode assemblies, enabling non-destructive testing. Furthermore, the test points on the top and bottom electrode assemblies can be designed according to the printed contacts of different batteries, eliminating the need to replace the entire assembly and adapting to various battery types. The structure is simple and the operation is convenient.

Claims

1. A battery testing device, characterized in that, The device includes: A top electrode assembly is used to make contact with the top point of the battery under test. The top electrode assembly includes a first contact surface for bonding with the battery under test. Test points corresponding to the printed contacts of the battery under test are distributed on the first contact surface. A bottom electrode assembly is used to make contact with a bottom point of the battery under test, and the bottom electrode assembly includes a second contact surface for bonding with the battery under test; The top electrode assembly and the bottom electrode assembly form a receiving space for placing the battery under test, and the top electrode assembly and / or the bottom electrode assembly are respectively provided with at least one test interface for connecting an external test device.

2. The battery testing apparatus according to claim 1, characterized in that, The device further includes a pressure fixing component located on the side of the top electrode assembly away from the bottom electrode assembly. The pressure fixing component is used to apply downward pressure toward the bottom electrode assembly to the top electrode assembly, thereby making the top electrode assembly fit tightly against the battery under test.

3. The battery testing apparatus according to claim 2, characterized in that, The pressure fixing assembly includes a third contact surface for engaging with the top electrode assembly, and the third contact surface is provided with flexible contacts that match the top electrode assembly.

4. The battery testing apparatus according to claim 2, characterized in that, The pressure fixing component is made of high-transparency quartz glass, and the light transmittance of the pressure fixing component is ≥90%.

5. The battery testing apparatus according to claim 1, characterized in that, The top electrode assembly includes a middle section and a current-collecting section. The middle section is used to make contact with the battery under test and conduct electricity to the current-collecting section. The current-collecting section is used to make contact with the bottom electrode assembly.

6. The battery testing apparatus according to claim 1, characterized in that, A limiting groove for limiting the position of the battery under test is provided on the side of the bottom electrode assembly facing the top electrode assembly.

7. The battery testing apparatus according to claim 1, characterized in that, The first contact surface is made of gold-plated copper, and the second contact surface is made of gold-plated copper.

8. The battery testing apparatus according to claim 1, characterized in that, The top electrode assembly includes at least a flexible structure.

9. The battery testing apparatus according to claim 1, characterized in that, An insulating portion is provided on the side of the bottom electrode assembly away from the top electrode assembly.

10. A battery testing method, characterized in that, The method includes: Place the battery under test in the limiting groove of the bottom electrode assembly so that the bottom of the battery under test is in full contact with the bottom electrode assembly; Align the top electrode assembly with the printed contacts on the top of the battery under test so that the test points of the top electrode assembly make corresponding contact with the printed contacts of the battery under test; Pressure is applied to the top electrode assembly through the flexible contacts of the pressure fixing component to ensure that the top electrode assembly is in close contact with the battery under test; External testing equipment can be connected via the test interface on the top electrode assembly and / or the bottom electrode assembly.

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