Battery cover assembly, battery and battery testing device

Abstract

This utility model provides a battery cover assembly, a battery, and a battery testing device. The battery cover assembly includes a battery cover, a sealing element, and a light-emitting element. The battery cover has an injection hole; the sealing element is connected to the battery cover to seal the injection hole, and a cavity is formed between the sealing element and the battery cover; the light-emitting element is disposed in the cavity and is used to emit light at the connection between the sealing element and the battery cover. This invention improves upon the technical problem in related technologies where helium gas is injected into the battery to determine the quality of the weld seal, but impurities in the injected helium gas can affect the battery quality.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery cover assembly, a battery, and a battery testing device. Background Technology

[0002] The lithium-ion battery manufacturing process generally includes: slurry preparation, coating, rolling, stacking or winding, assembly, electrolyte injection, formation, helium injection into the injection holes, sealing the injection holes with plugs, sealing and welding the injection holes, electrical performance screening, and packaging. Sealing and welding the injection holes is a crucial step in the lithium-ion battery manufacturing process. The quality of this welding directly affects the battery's sealing performance. Abnormal welding can lead to pinholes in the welding area of ​​the injection hole, resulting in poor sealing and a risk of electrolyte leakage from the injection hole, ultimately causing thermal runaway.

[0003] In related technologies, during lithium battery manufacturing processes, to characterize the sealing quality of the injection port, helium gas is often injected into the battery under negative pressure before sealing the injection port, followed by sealing welding. The battery with the injection port welded is then placed in a helium testing chamber to measure the amount of helium leakage. The amount of leaked helium is used to determine the quality of the weld seal and to assess the battery's sealing performance. However, if the helium injected into the battery is impure, it will affect the battery's quality. Utility Model Content

[0004] The present invention provides a battery cover assembly, a battery, and a battery testing device, which can improve the technical problem in related technologies where helium gas is injected into the battery to determine the welding seal quality, and if the helium gas injected into the battery is impure, it will affect the quality of the battery.

[0005] In a first aspect, embodiments of the present invention provide a battery cover assembly, comprising:

[0006] The battery cover has a liquid injection hole;

[0007] A sealing element is connected to the battery cover to seal the injection hole, and a cavity is formed between the sealing element and the battery cover.

[0008] A light-emitting element is disposed in the cavity and is used to emit light to the connection between the seal and the battery cover.

[0009] In one embodiment, the light-emitting element includes one or more of fluorescent light-emitting elements, phosphorescent light-emitting elements, and electroluminescent elements.

[0010] In one embodiment, the light-emitting element includes a gasket and a light-emitting layer, with at least a portion of the light-emitting layer located on the surface of the gasket for emitting light toward the connection between the seal and the battery cover.

[0011] In one embodiment, the seal is connected to the battery cover by a weld, and the light-emitting element is used to emit light toward the weld.

[0012] In one embodiment, the battery cover assembly includes a sealing element disposed within the injection hole, and the light-emitting element is disposed between the sealing element and the sealing element.

[0013] In one embodiment, the injection hole includes a first opening and a second opening that are connected, the diameter of the first opening being larger than the diameter of the second opening, the sealing element blocking the first opening, and the plugging element blocking the second opening.

[0014] In one embodiment, a stepped surface is formed between the wall of the second opening and the wall of the first opening, and one end face of the sealing member is located on the same plane as the stepped surface to facilitate the installation of the light-emitting element.

[0015] Secondly, embodiments of the present invention provide a battery including the aforementioned battery cover assembly.

[0016] Thirdly, embodiments of this utility model provide a battery detection device, comprising:

[0017] A light-emitting identification element is adapted to emit light from the light-emitting element of the aforementioned battery cover assembly; the light-emitting identification element is adapted to be disposed on the side of the seal opposite to the light-emitting element.

[0018] In one embodiment, the battery detection device further includes a light source adapted to be disposed on the side of the seal opposite to the light-emitting element.

[0019] In one embodiment, the luminescent identification device includes a CCD camera.

[0020] In the embodiments of this utility model, the light-emitting element can emit light. When the seal and battery cover are not sufficiently connected, and the injection hole is not fully sealed, meaning there is a gap at the connection between the seal and the battery cover, the light emitted by the light-emitting element can escape through this gap. When light is detected emanating from the connection between the seal and the battery cover, it indicates that the seal and battery cover are not fully connected. By placing the light-emitting element inside the cavity, it is convenient to identify and detect the sealing performance at the connection between the seal and the battery cover. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a three-dimensional schematic diagram of a battery provided in an embodiment of this utility model.

[0023] Figure 2 This is a top view of the battery provided in an embodiment of this utility model.

[0024] Figure 3 yes Figure 2 Cross-sectional view of L1-L1.

[0025] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0026] Figure 5 This is an exploded view of a portion of the battery structure provided in an embodiment of this utility model.

[0027] Figure 6 yes Figure 5 A magnified view of a section at point B in the middle.

[0028] Figure 7 This is a schematic diagram of the battery testing device provided in an embodiment of the present invention. Detailed Implementation

[0029] 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 skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0030] The lithium battery manufacturing process generally includes: slurry preparation, coating, rolling, stacking or winding, assembly, liquid injection, formation, helium injection into the injection holes, sealing of the injection holes, sealing and welding of the injection holes, electrical performance screening, and packaging.

[0031] The sealing welding of the electrolyte injection port is a crucial step in the lithium battery manufacturing process. The quality of the sealing welding directly affects the battery's airtightness. Abnormal welding may result in weld pinholes in the welding area of ​​the injection port, leading to poor sealing and the risk of electrolyte leakage from the injection port, ultimately causing thermal runaway of the battery.

[0032] In related technologies, during lithium battery manufacturing processes, to characterize the sealing quality of the injection port, helium gas is often injected into the battery under negative pressure before sealing the injection port, followed by sealing welding. The battery with the injection port welded is then placed in a helium testing chamber to measure the amount of helium leakage. The amount of leaked helium is used to determine the quality of the weld seal and to assess the battery's sealing performance. However, if the helium injected into the battery is impure, it will affect the battery's quality.

[0033] To solve at least some of the above-mentioned technical problems, please combine Figure 1 , Figure 2 This application provides a battery cover assembly 1. Please refer to... Figure 3 as well as Figure 4 In some embodiments, the battery cover assembly 1 includes:

[0034] The battery cover 10 has an injection hole 12 that penetrates the battery cover 10;

[0035] A sealing element 30 is connected to the battery cover plate 10 and is used to seal the liquid injection hole 12. A cavity 40 is formed between the sealing element 30 and the battery cover plate 10.

[0036] The light-emitting element 50 is disposed in the chamber 40 and is used to emit light to the connection between the sealing element 30 and the battery cover plate 10.

[0037] In this application, the light-emitting element 50 can emit light. When the seal 30 is not sufficiently connected to the battery cover 10, the injection hole 12 is not fully sealed, meaning there is a gap at the connection between the seal 30 and the battery cover 10, allowing light emitted by the light-emitting element 50 to escape through the gap. When light is observed emanating from the connection between the seal 30 and the battery cover 10, it indicates that the seal 30 and the battery cover 10 are not sufficiently connected. By providing the light-emitting element 50 within the chamber 40, the sealing performance of the connection between the seal 30 and the battery cover 10 can be easily identified and detected. Compared to related technologies where helium is injected into the battery to determine the welding seal quality, and impurities in the injected helium can affect battery quality, this application eliminates the need to inject helium into the battery by providing the light-emitting element 50 within the chamber 40, thus avoiding the problem of impure helium affecting battery quality.

[0038] Furthermore, in the process route of related technologies, there is a step of sealing the injection hole with glue after helium injection. If the glue seals the injection hole, the method of using a helium testing chamber to detect the amount of helium leakage in the battery to characterize the welding quality of the injection hole will fail severely. In this application, even if the glue seals the injection hole, it does not affect the light-emitting element 50 from emitting light at the connection between the sealing element 30 and the battery cover plate 10, thus avoiding the problem of misjudging the sealing performance of the battery and enabling accurate identification and confirmation of the sealing performance of the injection hole.

[0039] The seal 30 can be welded to the battery cover 10.

[0040] After the battery is assembled, its sealing performance needs to be tested. Only batteries that pass the test can leave the factory. When testing the sealing performance of a battery equipped with the battery cover assembly 1 of this application, if light is detected emanating from the connection between the seal 30 and the battery cover 10, the sealing performance between the seal 30 and the battery cover 10 is considered poor. If no light is detected emanating from the connection between the seal 30 and the battery cover 10, the sealing performance between the seal 30 and the battery cover 10 is considered to meet the requirements.

[0041] The luminous duration of the light-emitting element 50 does not need to be set to be long; it is sufficient that the light-emitting element 50 can emit light during the battery sealing performance test. The light-emitting element 50 can emit light autonomously or can be excited to emit light under certain conditions, such as under the excitation of an excitation light source.

[0042] The electrolyte injection hole 12 can penetrate the battery cover 10. It is easily understood that the electrolyte injection hole is a channel reserved during battery manufacturing for injecting electrolyte into the battery. The location of the injection hole varies depending on the type and design of the lithium battery: For cylindrical batteries: the injection hole is usually located at the top of the battery, in a specific position on the battery cap. For prismatic batteries: the injection hole may be located at the edge of the battery cover. For pouch batteries: the injection hole may be at the edge of the aluminum-plastic film encapsulation. After electrolyte injection, the injection hole needs to be sealed by welding, which can be done using laser welding or ultrasonic welding, to effectively prevent electrolyte leakage and the entry of external air and moisture into the battery.

[0043] In some embodiments, the light-emitting element 50 includes one or more of fluorescent light-emitting elements, phosphorescent light-emitting elements, and electroluminescent elements.

[0044] The light-emitting element 50 includes a fluorescent light-emitting element, which emits light through a fluorescent material. The fluorescent material can include inorganic fluorescent materials and organic fluorescent materials. Inorganic fluorescent materials can include rare-earth-doped phosphors (YAG:Ce, ZnS:Ag, etc., where YAG is yttrium aluminum garnet crystal, and YAG:Ce is cerium-doped yttrium aluminum garnet phosphor; ZnS:Ag is silver-doped zinc sulfide phosphor). Organic fluorescent materials can include fluorescent dyes (fluorescein, rhodamine, etc.).

[0045] The fluorescent light-emitting element can be a phosphorescent fluorescent element, which can absorb energy quickly and release it slowly; or it can be a two-agent reactive fluorescent material, which emits light through a chemical reaction with chemical agents. For example, the energy released by the reaction of peroxides and esters can be transferred to fluorescent dye molecules to make them emit light.

[0046] When the light-emitting element 50 includes a phosphorescent light-emitting element, the phosphorescent light-emitting element emits light through a phosphorescent material. The phosphorescent material can include inorganic phosphorescent materials and organic phosphorescent materials. Inorganic phosphorescent materials can include sulfides (ZnS:Cu-doped copper zinc sulfide phosphor) and aluminates (SrAl2O4:Eu,Dy: europium (Eu) and dysprosium (Dy) co-doped strontium aluminate phosphor), etc. Organic phosphorescent materials can include metal complexes (iridium and platinum complexes).

[0047] When the light-emitting element 50 includes an electroluminescent element, the electroluminescent element emits light through an electroluminescent material. The electroluminescent material may include inorganic electroluminescent materials and organic electroluminescent materials. Inorganic electroluminescent materials may include ZnS:Mn (manganese-doped zinc sulfide phosphor), and organic electroluminescent materials may include small molecules (Alq3: aluminum hydroxyquinoline) and polymers (PPV: poly(p-phenylene oxide)).

[0048] The injection hole 12 can penetrate the battery cover 10 along the thickness direction of the battery cover 10.

[0049] In some embodiments, the light-emitting element includes a gasket 51 and a light-emitting layer, at least a portion of which is located on the surface of the gasket for emitting light toward the junction of the seal 30 and the battery cover 10. Attaching the light-emitting layer to the gasket facilitates the installation of the light-emitting element.

[0050] The material of the luminescent layer can include rhodamine or polyfluorene.

[0051] In some embodiments, the seal 30 is connected to the battery cover 10 by a weld, and the light-emitting element 50 is used to emit light to the connection between the seal 30 and the battery cover 10.

[0052] In some embodiments, the battery cover assembly includes a sealing member 20 disposed within the injection hole 12, and a light-emitting element 50 disposed between the sealing member 20 and the sealing member 30. This facilitates the light-emitting element 50 emitting light towards the connection between the sealing member 30 and the battery cover 10.

[0053] In some implementation methods, please refer to Figure 5 as well as Figure 6 The injection hole 12 includes a first opening 121 and a second opening 122 that are connected. The second opening 122 is opened on the side of the first opening 121 away from the sealing member 30. The diameter of the first opening 121 is larger than the diameter of the second opening 122. The sealing member 30 blocks the first opening 121 and the sealing member 20 blocks the second opening 122.

[0054] The second opening 122 is sealed by the sealing element 20. The diameter of the first opening 121 is larger than the diameter of the second opening 122, which facilitates the installation of the sealing element 20.

[0055] The sealing element 30 can be a sealing pin, and the sealing element 20 can be a rubber pin. The rubber plug portion of the rubber pin is interference-fitted with the battery cover plate 10 to plug the second opening 122. After the rubber pin is plugged in, a sealing element 30 is placed on top, which can be made of metal. Then, the sealing element 30 is welded to the battery cover plate 10 to form an internal seal. The welding of the sealing element 30 to the battery cover plate 10 forms an external seal for the sealing element 20.

[0056] In some embodiments, a stepped surface 123 is formed between the wall of the second opening 122 and the wall of the first opening 121. One end face of the sealing member 20 is located on the same plane as the stepped surface 123 to facilitate the installation of the light-emitting element 50. This arrangement allows the end face of the sealing member 20 facing away from the second opening 122 to be on the same plane as the stepped surface 123, enabling the light-emitting element 50 to be installed on the plane of the stepped surface 123, thus providing a larger installation area for the light-emitting element 50.

[0057] In some examples, the end face of the sealing element 20 facing away from the second opening 122 may be on the same plane as the step surface 123 to facilitate the installation of the light-emitting element 50.

[0058] In some embodiments, a glue pin is inserted into the second opening 122, a gasket coated with a light-emitting layer is laid flat on the glue pin, and then the sealing member 30 is sealed and welded to the battery cover plate 10. A CCD camera is used to detect the connection between the sealing member 30 and the battery cover plate 10. If a light-emitting point is identified, it indicates that the seal between the sealing member 30 and the battery cover plate 10 is insufficient, with gaps or openings. If no light-emitting point is identified, it indicates that the seal between the sealing member 30 and the battery cover plate 10 is good.

[0059] In some embodiments, this application also provides a battery including the battery cover assembly described above.

[0060] In some implementation methods, please refer to Figure 7 This application also provides a battery detection device 3, which includes a light-emitting identification element 4. The light-emitting identification element 4 is adapted to identify the light emitted by the light-emitting element of the battery cover assembly as described above. The light-emitting identification element 4 is adapted to be disposed on the side of the sealing member 30 away from the light-emitting element 50.

[0061] The light-emitting element 50 inside chamber 40 emits light towards the connection between the sealing element 30 and the battery cover 10. When the connection between the sealing element 30 and the battery cover 10 is not tightly sealed, and there are defects such as gaps or pinholes, light will be emitted from the connection between the sealing element 30 and the battery cover 10. The light-emitting identification element 4 can detect and identify the light emitted from the connection between the sealing element 30 and the battery cover 10. In other words, when the light-emitting identification element 4 can detect and identify the light emitted from the connection between the sealing element 30 and the battery cover 10, it can be considered that the connection between the sealing element 30 and the battery cover 10 is not tightly sealed, and there are defects such as gaps or pinholes. That is, the sealing welding of the lithium battery does not meet the requirements.

[0062] In some embodiments, the battery detection device 3 further includes a light source 5, which is adapted to be positioned on the side of the sealing member 30 opposite to the light-emitting element 50. The light source can be an LED light source, a laser, etc. The light source can be used in conjunction with the light-emitting identification element 4, making it easier for the light-emitting identification element 4 to identify the light emitted by the light-emitting element 50. The light source can also excite the light-emitting element 50. When there is a gap at the connection between the sealing member 30 and the battery cover plate 10, the light source can enter the light-emitting element 50 inside the chamber 40, causing the light-emitting element 50 to be excited and emit light. That is, when the light-emitting identification element 4 detects the light emitted by the light-emitting element 50, it can be considered that there is a gap at the connection between the sealing member 30 and the battery cover plate 10.

[0063] In some embodiments, the luminescent identification element 4 includes a CCD camera.

[0064] CCD is an abbreviation for "Charge-Coupled Device," a photoelectric conversion device based on semiconductor principles. When the image of a subject is focused onto the CCD chip through a lens, the CCD accumulates a corresponding proportion of charge according to the brightness of the light. Under video timing control, the charge accumulated in each pixel is transferred point by point, and after filtering and amplification, it is converted into a video signal for output. The specific process includes light absorption, electron excitation, charge generation, and charge collection. Photons strike the semiconductor material, exciting electron transitions to generate electron-hole pairs, and the charge is concentrated on the photosensitive element to form an image signal.

[0065] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery cover plate assembly (1), characterized in that, include: The battery cover (10) is provided with an injection hole (12); A sealing element (30) is connected to the battery cover plate (10) to seal the injection hole (12), and a cavity (40) is formed between the sealing element (30) and the battery cover plate (10); A light-emitting element (50) is disposed in the chamber (40) and is used to emit light to the connection between the seal (30) and the battery cover (10).

2. The battery cover plate assembly of claim 1, wherein, The light-emitting element (50) includes one or more of fluorescent light-emitting elements, phosphorescent light-emitting elements, and electroluminescent elements.

3. The battery cover plate assembly of claim 1 or 2, wherein, The light-emitting element (50) includes a gasket (51) and a light-emitting layer, at least a portion of which is located on the surface of the gasket (51) for emitting light at the connection between the seal (30) and the battery cover (10).

4. The battery cover plate assembly of claim 1 or 2, wherein, The sealing element (30) is connected to the battery cover plate (10) by a weld, and the light-emitting element (50) is used to emit light to the weld.

5. The battery cover assembly according to claim 1 or 2, characterized in that, The battery cover assembly includes a sealing element (20) disposed inside the injection hole (12), and a light-emitting element (50) disposed between the sealing element (20) and the sealing element (30).

6. The battery cover assembly according to claim 5, characterized in that, The injection hole (12) includes a first opening (121) and a second opening (122) that are connected. The diameter of the first opening (121) is larger than the diameter of the second opening (122). The sealing element (30) blocks the first opening (121) and the sealing element (20) blocks the second opening (122).

7. The battery cover assembly according to claim 6, characterized in that, A stepped surface (123) is formed between the wall of the second opening (122) and the wall of the first opening (121). One end face of the sealing member (20) is located on the same plane as the stepped surface (123) to facilitate the installation of the light-emitting member (50).

8. A battery (2), characterized in that, Includes the battery cover assembly as described in any one of claims 1-7.

9. A battery testing device (3), characterized in that, include: The light-emitting identification element (4) is adapted to identify light emitted by the light-emitting element of the battery cover assembly as described in any one of claims 1-7; The light-emitting identification element (4) is adapted to be disposed on the side of the seal (30) opposite to the light-emitting element (50).

10. The battery testing device according to claim 9, characterized in that, The battery detection device further includes a light source (5), which is adapted to be disposed on the side of the seal (30) away from the light-emitting element (50).

11. The battery testing device according to claim 9, characterized in that, The luminous identification element (4) includes a CCD camera.

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