Battery liquid injection hole structure and battery

Abstract

The invention relates to the technical field of batteries, and discloses a battery liquid injection hole structure and a battery, an upper-stage sealing ring and a lower-stage sealing ring are coaxially arranged in a liquid injection hole, so that the first sealing ring on the upper layer can be pushed away by negative pressure during air exhaust to form a one-way airflow gap, air is quickly exhausted, and external air is prevented from being recharged; during liquid injection, the second sealing ring on the lower layer can be hydraulically pushed away to form a liquid flow gap, so that the electrolyte is smoothly injected and prevented from overflowing; after the working procedure is completed, the double sealing rings are automatically reset, so that double sealing is realized, dust and moisture are prevented from invading, electrolyte leakage caused by sealing failure after the sealing nail is inserted is avoided, and therefore, the vacuum retention rate, the liquid injection stability and the long-term reliability of the battery are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery liquid injection hole structure and a battery. Background Art

[0002] After the existing power battery is rolled into the shell, negative pressure vacuum is first performed through the injection hole on the top cover, and then electrolyte is injected, and finally the injection hole is permanently sealed with a sealing pin.

[0003] In the prior art, the injection hole directly connects the inside and outside of the battery, which has the following defects:

[0004] (1) When pumping air, external air is easily re-injected, affecting the vacuum degree;

[0005] (2) After filling and before sealing, the electrolyte that is not fully soaked is easy to overflow from the filling hole;

[0006] (3) When the sealing pin seal weld fails, the electrolyte that is not fully infiltrated is also easy to overflow from the injection hole;

[0007] (4) If the dust and moisture in the production environment are not strictly controlled, they will enter the battery through the injection hole, causing significant impact on the battery.

[0008] Therefore, there is a need to improve the existing technology.

[0009] The above information is presented as background information only to assist with an understanding of the present disclosure and is not a determination or admission that any of the above may be applicable as prior art with respect to the present disclosure. Summary of the Invention

[0010] The present invention provides a battery liquid injection hole structure and a battery to solve the problems existing in the prior art.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] In a first aspect, the present invention provides a battery liquid filling hole structure, comprising a top cover plate, a first sealing ring and a second sealing ring; wherein,

[0013] The top cover plate is provided with a liquid injection hole, a first channel and a second channel; the first channel and the second channel are respectively arranged around the liquid injection hole from top to bottom, and are respectively connected to the liquid injection hole and the interior of the battery;

[0014] The first sealing ring is located in the first channel and is arranged close to the liquid injection hole to seal the first channel and the liquid injection hole;

[0015] When negative pressure is applied through the injection hole to extract gas from the battery, the gas enters the first channel and pushes the first sealing ring toward the injection hole, causing elastic deformation. This creates an airflow gap between the first channel and the injection hole, allowing the gas to flow out of the battery.

[0016] The second sealing ring is located in the second channel and is arranged away from the liquid injection hole to seal the second channel and the liquid injection hole;

[0017] When electrolyte is injected through the injection hole, the electrolyte enters the second channel and pushes the second sealing ring to produce elastic deformation in a direction further away from the injection hole, thereby forming a liquid flow gap between the second channel and the injection hole, allowing the electrolyte to flow into the interior of the battery.

[0018] Furthermore, the battery liquid filling hole structure further includes a sealing nail;

[0019] The sealing pin is inserted into the liquid injection hole.

[0020] Furthermore, in the battery liquid injection hole structure, the diameter of the sealing nail is larger than the diameter of the liquid injection hole.

[0021] Furthermore, in the battery liquid filling hole structure, the first sealing ring is tightly sleeved on the sealing pin.

[0022] Furthermore, in the battery liquid filling hole structure, the first sealing ring and the second sealing ring are both annular elastic bodies.

[0023] Furthermore, in the battery liquid filling hole structure, the first sealing ring, the second sealing ring and the sealing pin are all made of rubber.

[0024] Furthermore, in the battery liquid injection hole structure, the second channel is connected to the liquid injection hole through a plurality of communication holes distributed at intervals along the circumference of the liquid injection hole.

[0025] Furthermore, in the battery liquid injection hole structure, the top cover plate is provided with a sink at the upper end opening of the liquid injection hole;

[0026] The inner diameter of the sink is larger than the diameter of the liquid injection hole and is used to accommodate the head of the sealing pin so that the head is not higher than the upper surface of the top cover plate.

[0027] Furthermore, in the battery liquid filling hole structure, the bottom surface of the sink is provided with at least one annular sealing rib, and the annular sealing rib is interference-fitted with the lower surface of the sealing nail head to achieve secondary sealing.

[0028] In a second aspect, the present invention provides a battery, characterized in that it includes the battery liquid injection hole structure provided in the first aspect.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a battery filling hole structure and a battery. By coaxially arranging upper and lower sealing rings in the filling hole, the first sealing ring of the upper layer can be pushed open by negative pressure during vacuuming to form a one-way airflow gap, which can quickly exhaust the air and prevent the backflow of external air; during liquid injection, the second sealing ring of the lower layer can be hydraulically pushed open to form a liquid flow gap, so that the electrolyte can be smoothly injected and overflow can be avoided; after the process is completed, the double sealing rings automatically reset to achieve double sealing, preventing the intrusion of dust and moisture and the leakage of electrolyte when the seal fails after the sealing nail is inserted, thereby significantly improving the vacuum retention rate, liquid injection stability and long-term reliability of the battery.

[0031] The present invention has other features and advantages that will be apparent from or will be described in detail in the accompanying drawings and the following detailed description incorporated herein, which together serve to explain certain principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is one of the structural schematic diagrams of a battery liquid filling hole structure provided in the first embodiment of the present invention;

[0034] Figure 2 This is the second structural schematic diagram of a battery liquid filling hole structure provided in the first embodiment of the present invention;

[0035] Figure 3 This is the third structural diagram of a battery liquid injection hole structure provided in the first embodiment of the present invention;

[0036] Figure 4 This is the fourth structural schematic diagram of a battery liquid filling hole structure provided in the first embodiment of the present invention.

[0037] Reference numerals:

[0038] Top cover plate 1, first sealing ring 2, second sealing ring 3, liquid injection hole 4, first channel 5, second channel 6, sealing pin 7, communication hole 8. DETAILED DESCRIPTION

[0039] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0040] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0041] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0042] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0043] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0044] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0045] In this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise specifically limited.

[0046] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0047] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] Example 1

[0049] In view of the aforementioned shortcomings of the existing technology, the applicant, drawing upon years of extensive practical experience and expertise in the design and manufacture of such products, combined with the application of academic theory, has actively engaged in research and innovation, hoping to create a technology that can address these shortcomings. Through continuous research and design, and through repeated trial production and refinement, the present invention has been developed, which possesses truly practical value.

[0050] Please refer to Figure 1-3 , an embodiment of the present invention provides a battery liquid filling hole structure, including a top cover plate 1, a first sealing ring 2 and a second sealing ring 3;

[0051] The top cover plate 1 serves as the foundational support for the entire injection hole structure, meticulously crafted with the injection hole 4, first channel 5, and second channel 6. Specifically, the first channel 5 and second channel 6 are arranged from top to bottom on the top cover plate 1, surrounding the injection hole 4. Furthermore, each of these channels plays an important role in connectivity, connecting the first channel 5 and second channel 6 to the injection hole 4 and the internal space of the battery, respectively, providing the necessary circulation paths for subsequent gas extraction and electrolyte injection operations.

[0052] The first sealing ring 2 is precisely positioned within the first channel 5, near the injection port 4. The primary function of the first sealing ring 2 is to seal the connection between the first channel 5 and the injection port 4, ensuring effective isolation between the battery interior and the external environment when not in operation. When negative pressure is applied through the injection port 4 to extract gas from the battery, the gas enters the first channel 5. Driven by the gas pressure, the first sealing ring 2 elastically deforms, moving closer to the injection port 4. This elastic deformation creates a precisely defined airflow gap between the first channel 5 and the injection port 4. This gap allows for smooth outflow of gas from the battery interior, enabling rapid and efficient extraction. Furthermore, due to the special design and elastic deformation properties of the first sealing ring 2, it effectively prevents external air from re-entering the battery interior through the injection port 4 during the extraction process, ensuring a stable and reliable vacuum level within the battery.

[0053] The second sealing ring 3 is arranged inside the second channel 6, and its position is far away from the injection hole 4. The main function of the second sealing ring 3 is to seal the connection between the second channel 6 and the injection hole 4 to prevent leakage of electrolyte and entry of external impurities in the non-injection state. When it is necessary to inject electrolyte into the battery through the injection hole 4, the electrolyte will first enter the second channel 6. As the electrolyte is continuously injected, its hydraulic pressure will gradually increase, thereby pushing the second sealing ring 3 to produce elastic deformation in the direction of continuing to move away from the injection hole 4. This elastic deformation forms a liquid flow gap between the second channel 6 and the injection hole 4 through which electrolyte can flow. The electrolyte can flow smoothly into the battery through this liquid flow gap, ensuring the stability and efficiency of the electrolyte injection process. At the same time, the elastic deformation characteristics of the second sealing ring 3 can also effectively avoid overflow of electrolyte during the injection process, ensuring the cleanliness and safety of the production site.

[0054] The battery injection hole structure proposed in the embodiment of the present invention realizes a variety of innovative functions by coaxially arranging upper and lower sealing rings, namely the first sealing ring 2 and the second sealing ring 3, in the injection hole 4. During the vacuum operation stage, the negative pressure can push open the upper first sealing ring 2 to form a one-way airflow gap. This design can not only quickly discharge the gas inside the battery, but also effectively prevent the backflow of external air, thereby ensuring the stability of the vacuum degree inside the battery and creating good conditions for subsequent electrolyte injection operations. During the injection operation stage, the hydraulic pressure can push open the lower second sealing ring 3 to form a liquid flow gap, so that the electrolyte can be smoothly injected into the battery, while avoiding the overflow of the electrolyte, thereby improving the accuracy and stability of the injection process. After completing the vacuuming and injection processes, the first sealing ring 2 and the second sealing ring 3 can automatically reset and return to the initial sealing state, thereby realizing double sealing of the injection hole 4. This double sealing mechanism can effectively prevent dust, moisture and other impurities in the production environment from invading the battery. At the same time, even if the seal fails after the sealing pin is inserted, it can prevent electrolyte leakage, thereby significantly improving the battery's vacuum retention rate, liquid injection stability and long-term reliability, providing a strong guarantee for high-quality production and long-term stable use of the battery.

[0055] Please refer to Figure 4 In one implementation of this embodiment, in addition to the key components such as the top cover plate 1, the first sealing ring 2, the second sealing ring 3 mentioned above, the battery filling hole structure also has an additional important component, a sealing nail 7.

[0056] Specifically, the sealing nail 7 is precisely inserted into the interior of the liquid injection hole 4. The sealing nail 7 plays a crucial final sealing role in the entire battery liquid injection hole structure. After completing a series of key processes such as battery vacuuming and electrolyte injection, the sealing nail 7 needs to be inserted into the liquid injection hole 4 to achieve permanent and high-reliability sealing of the liquid injection hole 4. This operation can effectively ensure that the interior of the battery is completely isolated from the external environment, preventing problems such as electrolyte leakage and intrusion of external impurities (such as dust, moisture, etc.) during subsequent battery use, storage, and transportation, thereby ensuring the performance stability and safety of the battery, extending the service life of the battery, and providing solid protection for the reliable operation of the battery under various complex working conditions.

[0057] In one implementation of this embodiment, there are rigorous and critical design considerations for the dimensional relationship between the sealing pin 7 and the injection hole 4 , specifically, the diameter of the sealing pin 7 is larger than the diameter of the injection hole 4 .

[0058] From the perspective of structural design principles, the design of this size difference is not arbitrary, but is based on in-depth consideration to ensure the sealing effect. When the diameter of the sealing nail 7 is larger than the diameter of the injection hole 4, during the operation of inserting the sealing nail 7 into the injection hole 4, the outer wall of the sealing nail 7 will form a close contact with the inner wall of the injection hole 4 with a certain degree of extrusion strength. This close contact forms a reliable mechanical seal structure between the sealing nail 7 and the injection hole 4, which can effectively prevent the electrolyte inside the battery from leaking out through the injection hole 4, and can also prevent dust, moisture and other impurities in the external environment that may have a negative impact on battery performance from entering the battery.

[0059] From the perspective of seal stability and durability, the larger diameter difference provides sufficient elastic deformation space and friction for the seal. During the insertion process, the wall of the injection hole 4 will exert a certain amount of elastic pressure on the sealing pin 7, causing the sealing pin 7 to undergo slight elastic deformation, thereby better fitting the shape of the injection hole 4 and further enhancing the sealing effect. Moreover, this sealing structure formed by the size difference has good vibration and impact resistance. It can maintain the stability of the sealing state when the battery is subjected to external mechanical stress, ensuring that the battery can operate reliably in a variety of complex usage environments.

[0060] In addition, this size design also facilitates operation and quality control during the actual production process. The operator can easily and accurately insert the sealing pin 7 into the liquid injection hole 4, and through intuitive observation and simple testing methods, such as checking the tightness of the fit between the sealing pin 7 and the liquid injection hole 4, determine whether the seal is qualified, thereby effectively improving production efficiency and product quality consistency. In summary, the design of the sealing pin 7 having a diameter larger than the diameter of the liquid injection hole 4 is one of the key technical features in the embodiment of the present invention to ensure the sealing performance of the battery liquid injection hole structure.

[0061] In one implementation of this embodiment, an ingenious and critical design is made for the assembly relationship between the first sealing ring 2 and the sealing pin 7 , specifically, the first sealing ring 2 is tightly sleeved on the sealing pin 7 .

[0062] From an in-depth analysis of the sealing principle, this close-fitting design builds a multi-level, highly reliable sealing barrier. When the sealing pin 7 is inserted into the injection hole 4 to achieve the final seal, the first sealing ring 2, by virtue of its close fit with the sealing pin 7, can effectively fill the tiny gap that may exist between the sealing pin 7 and the inner wall of the injection hole 4. Since the first sealing ring 2 has a certain degree of elasticity and flexibility, it will undergo elastic deformation when squeezed by the sealing pin 7, thereby more tightly wrapping the outer surface of the sealing pin 7, forming a tight static sealing defense line, preventing the electrolyte inside the battery from leaking through the fitting gap between the sealing pin 7 and the injection hole 4.

[0063] During the battery's vacuuming and liquid injection operations, the design of the first sealing ring 2 tightly fitting around the sealing pin 7 also plays an indispensable role. During the vacuuming stage, when negative pressure is applied through the liquid injection hole 4 to extract the gas inside the battery, the first sealing ring 2, under the dual effects of negative pressure and gas flow, will elastically deform toward the liquid injection hole 4 to form an airflow gap for gas to be discharged. However, since it is always tightly fitted to the sealing pin 7, this deformation is within a controllable range, ensuring that after the gas is discharged, the first sealing ring 2 can quickly return to its original shape and fit tightly around the sealing pin 7 again, effectively preventing external air from flowing back into the battery after vacuuming, and maintaining a stable vacuum inside the battery.

[0064] During the injection phase, when the electrolyte is injected into the battery through the injection hole 4, the first sealing ring 2 remains in close contact with the sealing pin 7. Although the second sealing ring 3 elastically deforms under the hydraulic pressure of the electrolyte to form a flow gap for the electrolyte to flow in, the tight fit of the first sealing ring 2 prevents the electrolyte from accidentally seeping into the area between the sealing pin 7 and the first channel 5 during the injection process, avoiding potential safety hazards such as corrosion and short circuits caused by residual electrolyte, thereby ensuring the stability and safety of the battery's internal structure.

[0065] From the perspective of production technology and quality control, the design of the first sealing ring 2 snugly fitting over the sealing pin 7 facilitates standardized, large-scale production and assembly. Operators can accurately fit the first sealing ring 2 onto the sealing pin 7 according to a unified process flow. Simple inspection methods, such as observing the fit between the first sealing ring 2 and the sealing pin 7 and performing sealing performance tests, ensure that the assembly quality meets design requirements, effectively improving production efficiency and product quality stability.

[0066] In summary, the design of the first sealing ring 2 tightly fitting on the sealing pin 7 is a key innovation of the battery filling hole structure in the embodiment of the present invention. It provides a strong guarantee for the sealing performance, production quality and long-term stability of the battery through an ingenious sealing mechanism and a reliable assembly method.

[0067] In one implementation of this embodiment, the structural forms of the first sealing ring 2 and the second sealing ring 3, as well as the material selection of the first sealing ring 2 and the second sealing ring 3 and the sealing pin 7 are rigorously and scientifically set. Specifically, the first sealing ring 2 and the second sealing ring 3 are both designed as annular elastic bodies.

[0068] From a structural and functional perspective, the annular design allows the first and second sealing rings 2 and 3 to perfectly fit within the annular inner walls of the first and second channels 5 and 6 defined in the top cover plate 1, and to form a tight fit with components such as the sealing pins 7. This annular structure creates a continuous, uniform sealing surface at the sealing point, effectively preventing leakage caused by discontinuous sealing surfaces. The properties of the elastomer impart excellent elasticity and flexibility to the first and second sealing rings 2 and 3, enabling them to automatically adjust their sealing properties based on pressure and deformation. During different battery operating stages, such as vacuuming and filling, the first and second sealing rings 2 and 3 elastically deform to adapt to complex operating conditions, maintaining reliable sealing performance. For example, during vacuuming, the first sealing ring 2 deforms appropriately under negative pressure to create an airflow gap, and then quickly returns to its original shape after vacuuming, restoring a tight seal. During filling, the second sealing ring 3 also responds elastically to the hydraulic pressure of the electrolyte, ensuring smooth electrolyte injection while preventing leakage.

[0069] Furthermore, the material of the first sealing ring 2, the second sealing ring 3 and the sealing nail 7 are all selected to be rubber. As a polymer material with excellent comprehensive performance, rubber has a wide range of applications and many advantages in the field of battery sealing. First of all, rubber has excellent elasticity and resilience, which enables the first sealing ring 2, the second sealing ring 3 and the sealing nail 7 to quickly return to their original shape and size after being deformed by external force, thereby ensuring the durability and stability of the sealing effect. Whether it is the assembly operation during the battery production process or the deformation of components caused by temperature changes, mechanical vibrations and other factors during actual use, the rubber seal can adaptively adjust the sealing state with its good elasticity to effectively prevent leakage.

[0070] Secondly, rubber has excellent chemical stability, resisting corrosion from the battery's internal electrolyte and various chemicals in the external environment. Over the long-term use of the battery, the electrolyte may corrode the seals. However, the rubber-made first and second sealing rings 2 and 3, as well as the sealing pins 7, maintain their physical and chemical properties over a long period of time thanks to their chemical stability, ensuring the integrity and reliability of the sealing structure and extending the battery's service life.

[0071] Furthermore, rubber is easy to process and shape. Through sophisticated processes like compression molding and injection molding, seals with complex shapes and precise dimensions can be manufactured, meeting the high-precision seal requirements of battery injection port structures. Furthermore, rubber's relatively low cost helps reduce battery production costs and enhance product competitiveness.

[0072] To sum up, designing the first sealing ring 2 and the second sealing ring 3 as annular elastomers and selecting rubber as the material of the first sealing ring 2, the second sealing ring 3 and the sealing pin 7 is an optimized choice in the embodiment of the present invention after comprehensive consideration of multiple factors such as sealing performance, chemical stability, processing technology and cost.

[0073] In one implementation of this embodiment, an innovative and ingenious design is made for the connecting structure between the second channel 6 and the injection hole 4. Specifically, the second channel 6 and the injection hole 4 are connected through a number of connecting holes 8 distributed at intervals along the circumference of the injection hole 4.

[0074] From the perspective of fluid dynamics and sealing design, an in-depth analysis shows that this layout of the connecting holes 8 has many significant advantages. First, the several connecting holes 8 distributed circumferentially along the injection hole 4 can ensure that the electrolyte flows evenly and stably in the process of flowing from the second channel 6 into the injection hole 4. During the battery injection process, the electrolyte needs to enter the injection hole 4 from the outside through the second channel 6 and then be injected into the battery. If the connection structure is unreasonable, it may cause uneven electrolyte flow and local flow rates to be too fast or too slow, which will not only affect the injection efficiency, but may also have an adverse effect on the internal structure and performance of the battery. The design of circumferentially spaced connecting holes 8 can enable the electrolyte to enter the injection hole 4 from multiple directions at the same time, forming a flow pattern similar to "multi-point injection", effectively avoiding the concentrated impact of the electrolyte in a certain local area, ensuring the uniform distribution of the electrolyte in the injection hole 4, thereby improving the uniformity and stability of the injection, and helping to improve the overall performance and consistency of the battery.

[0075] Secondly, the layout of the connecting holes 8 also has a positive impact on the sealing performance. In the sealing structure of the battery, the second sealing ring 3 is usually arranged at the connection between the second channel 6 and the injection hole 4 to prevent electrolyte leakage. When the connecting holes 8 are distributed circumferentially, the elastic deformation of the second sealing ring 3 can be more evenly distributed around each connecting hole 8 when subjected to the hydraulic pressure of the electrolyte. During the injection process, the electrolyte will exert a certain pressure on the second sealing ring 3, causing it to elastically deform to form a liquid flow gap for the electrolyte to pass through. Because the connecting holes 8 are distributed circumferentially, the deformation of the second sealing ring 3 will also show a uniform and regular state accordingly, rather than local excessive deformation or insufficient deformation. This uniform elastic deformation helps the second sealing ring 3 quickly return to its original shape after the injection is completed, and re-fit tightly at the connection between the second channel 6 and the injection hole 4 to form a reliable seal, effectively preventing electrolyte leakage after the injection is completed, and ensuring the sealing performance and safety of the battery.

[0076] In one embodiment of this invention, the assembly structure of the top cover plate 1 and the sealing pin 7 is meticulously and ingeniously designed to comprehensively enhance the sealing performance and overall reliability of the battery injection hole structure. Specifically, the top cover plate 1 is meticulously provided with a sunken platform structure at the upper opening of the injection hole 4.

[0077] From the perspective of structural design principles, the inner diameter of the sink has been precisely calculated and optimized, and its value is greater than the diameter of the injection hole 4. This design is not arbitrary, but has a clear functional purpose. Its main function is to provide a special accommodation space for the head of the sealing pin 7 to ensure that after the sealing pin 7 is installed in place, its head will not be higher than the upper surface of the top cover plate 1. Such a design is of great significance in many aspects: on the one hand, it can ensure the flatness of the upper surface of the top cover plate 1, avoid interference with the subsequent assembly, use and coordination of the battery with other components due to the protruding head of the sealing pin 7, and ensure the smoothness and stability of the battery during the overall assembly process; on the other hand, the flat upper surface of the top cover plate 1 is beneficial to the safety and reliability of the battery in various use environments, reduces the potential risks of collision, wear and tear caused by protruding components, and extends the service life of the battery.

[0078] Furthermore, in order to further enhance the sealing effect, at least one annular sealing rib is provided on the bottom surface of the sink. These annular sealing ribs are precision machined, and their shape, size and position are strictly controlled and optimized. The annular sealing rib and the lower surface of the head of the sealing pin 7 are assembled by interference fit. Interference fit is a sealing and connection method commonly used in mechanical design. By making the diameter of the annular sealing rib slightly larger than the corresponding diameter of the lower surface of the head of the sealing pin 7, a certain elastic deformation is generated during the assembly process, thereby forming close contact and strong friction between the two. This close contact can effectively prevent the electrolyte inside the battery from leaking out through the gap between the sealing pin 7 and the top cover plate 1, thereby realizing the function of secondary sealing.

[0079] The design of the secondary seal is of great significance in the field of battery sealing. During the use of the battery, it may be affected by various factors, such as temperature changes, mechanical vibrations, pressure fluctuations, etc. These factors may have a certain impact on the primary seal (such as the seal of the sealing ring), resulting in a decrease in sealing performance. The secondary seal formed by the interference fit between the annular sealing rib and the lower surface of the head of the sealing pin 7 can provide additional sealing protection when there is a potential risk of failure of the primary seal, greatly improving the sealing reliability and stability of the battery filling hole structure. Even if the primary seal is damaged to a certain extent, the secondary seal can still effectively prevent electrolyte leakage, ensure the stability of the chemical environment inside the battery, and guarantee the normal performance and safe operation of the battery.

[0080] To sum up, in this embodiment, the top cover plate 1 is provided with a sink at the upper end opening of the liquid injection hole 4, and at least one annular sealing rib is provided on the bottom surface of the sink that is interference fit with the lower surface of the head of the sealing nail 7. This is an innovative design scheme that has been carefully conceived and optimized, and provides a reliable and efficient sealing solution for the battery liquid injection hole structure, which has important practical application value.

[0081] Although the terms "top cover plate," "first sealing ring," and "second sealing ring" are frequently used in this application, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

[0082] Example 2

[0083] An embodiment of the present invention provides a battery, comprising the battery liquid filling hole structure provided in the first embodiment.

[0084] As a key device for energy storage and conversion, batteries play an indispensable role in many areas of modern society, such as electric vehicles, portable electronic devices, and energy storage systems. Their performance, reliability, and safety are directly related to the normal operation and service life of related equipment.

[0085] By integrating the battery injection hole structure of the first embodiment into the battery, the battery inherits all the advantages of the battery injection hole structure while further improving its overall performance. This integrated design not only optimizes the battery's internal structure and increases its energy density and power density, but also provides a strong guarantee for the battery's long-term stable operation. Whether in harsh environments such as high temperature, low temperature, and high humidity, or during frequent charge and discharge cycles, the battery can maintain good performance and reliability, providing users with stable and efficient energy support.

[0086] In summary, the battery provided in the second embodiment of the present invention, which is integrated with the battery liquid injection hole structure in the first embodiment, is an innovative and practical energy storage device, and is expected to be widely used and promoted in the energy field in the future.

[0087] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A battery filling hole structure, characterized in that: It comprises a top cover plate (1), a first sealing ring (2) and a second sealing ring (3); wherein, The top cover plate (1) is provided with a liquid injection hole (4), a first channel (5) and a second channel (6); the first channel (5) and the second channel (6) are respectively arranged around the liquid injection hole (4) from top to bottom, and are respectively connected to the liquid injection hole (4) and the interior of the battery; The first sealing ring (2) is located in the first channel (5) and is arranged close to the injection hole (4) to seal the first channel (5) and the injection hole (4); When negative pressure is applied through the injection hole (4) to extract gas from the battery, the gas enters the first channel (5) and pushes the first sealing ring (2) to elastically deform in a direction closer to the injection hole (4), thereby forming an air flow gap between the first channel (5) and the injection hole (4) to allow the gas to flow out of the battery; The second sealing ring (3) is located in the second channel (6) and is arranged away from the liquid injection hole (4) to seal the second channel (6) and the liquid injection hole (4); When the electrolyte is injected through the injection hole (4), the electrolyte enters the second channel (6) and pushes the second sealing ring (3) to produce elastic deformation in a direction further away from the injection hole (4), thereby forming a liquid flow gap between the second channel (6) and the injection hole (4) for the electrolyte to flow into the interior of the battery.

2. The battery liquid injection hole structure according to claim 1, characterized in that: Also includes a sealing nail (7); The sealing pin (7) is inserted into the liquid injection hole (4).

3. The battery liquid injection hole structure according to claim 2, characterized in that: The diameter of the sealing nail (7) is larger than the diameter of the liquid injection hole (4).

4. The battery liquid injection hole structure according to claim 2, characterized in that: The first sealing ring (2) is tightly sleeved on the sealing pin (7).

5. The battery liquid injection hole structure according to claim 1, characterized in that: The first sealing ring (2) and the second sealing ring (3) are both annular elastic bodies.

6. The battery liquid injection hole structure according to claim 2, characterized in that: The first sealing ring (2), the second sealing ring (3) and the sealing pin (7) are all made of rubber.

7. The battery liquid injection hole structure according to claim 1, characterized in that: The second channel (6) is connected to the liquid injection hole (4) via a plurality of communication holes (8) distributed at intervals along the circumference of the liquid injection hole (4).

8. The battery liquid injection hole structure according to claim 2, characterized in that: The top cover plate (1) is provided with a sink at the upper opening of the liquid injection hole (4); The inner diameter of the sink is larger than the diameter of the injection hole (4) and is used to accommodate the head of the sealing pin (7) so that the head is not higher than the upper surface of the top cover plate (1).

9. The battery liquid filling hole structure according to claim 8, characterized in that: The bottom surface of the sink is provided with at least one annular sealing rib, and the annular sealing rib is interference-fitted with the lower surface of the head of the sealing pin (7) to achieve secondary sealing.

10. A battery, characterized in that: The invention comprises a battery liquid filling hole structure as claimed in any one of claims 1 to 9.

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