Sealing pins and cover plate assemblies

Abstract

This application provides a sealing pin and cover assembly. The sealing pin is suitable for sealing the electrolyte filling hole of a battery. The sealing pin includes a sealing section and a mating section connected to each other. The sealing section is interference-fitted with the electrolyte filling hole. The mating section is also interference-fitted with the electrolyte filling hole. The side wall of the mating section is provided with a venting space, which is connected to the interior of the battery. In this application, the mating section of the sealing pin and the electrolyte filling hole are interference-fitted, which can ensure the installation stability and reliability of the sealing pin in the electrolyte filling hole during the process of drawing negative pressure and introducing helium gas into the battery. This improves the sealing pin's resistance to external interference factors and avoids problems such as the sealing pin becoming misaligned, falling off, or causing blockage of the venting space, thereby ensuring smooth gas flow.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a sealing nail and cover assembly. Background Technology

[0002] After the battery completes its second electrolyte filling, the sealing pin needs to be pre-installed into the filling hole. Then, negative pressure is applied to the inside of the battery, and helium gas is introduced. Finally, the sealing pin is fully embedded into the filling hole to achieve a final seal. The sealing pin typically consists of a sealing section to seal the filling hole and a mating section to ensure gas flow. To ensure a good seal, the sealing section has an interference fit with the filling hole, while the mating section has a clearance fit, forming a venting channel. However, due to dimensional discrepancies between the sealing section and the mating section, the sealing section may block the filling hole during helium gas introduction, affecting the normal flow of helium. Utility Model Content In view of the above, this application aims to provide a sealing nail and cover plate assembly to solve some or all of the above-mentioned technical problems.

[0003] In view of the above objectives, a first aspect of this application provides a sealing pin suitable for sealing the liquid injection hole of a battery, the sealing pin comprising a sealing section and a mating section connected to each other; The sealing section is interference-fitted with the injection hole; the fitting section is interference-fitted with the injection hole, and the side wall of the fitting section is provided with a venting space, which is connected to the interior of the battery.

[0004] Based on the same inventive concept, a second aspect of this application also provides a cover plate assembly, including a cover plate body; And a sealing pin as described in any one of the first aspects, the sealing pin being interference-fitted with the injection hole.

[0005] As can be seen from the above, the sealing pin and cover plate assembly provided in this application includes a sealing section and a mating section that can be interference-fitted with the liquid injection hole, and the mating section is provided with a venting space that communicates with the inside of the battery. By making the mating section interference-fitted with the liquid injection hole, the installation stability and reliability of the sealing pin in the liquid injection hole can be ensured during the process of drawing negative pressure and introducing helium into the battery, the resistance of the sealing pin to external interference factors can be improved, and problems such as the sealing pin being skewed, falling off, or causing blockage of the venting space can be avoided, thus ensuring the smooth flow of gas. Attached Figure Description

[0006] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0007] Figure 1 This is a schematic diagram of a close-fitting nail in a related technology; Figure 2 This is a cross-sectional view of a sealing pin in related technologies; Figure 3 This is a schematic diagram of the sealing pin in the pre-installed state in related technologies; Figure 4 This is a schematic diagram of the sealing pin in a sealed state in related technologies; Figure 5 This is a schematic diagram of the first type of sealing nail at a first angle in an embodiment of this application; Figure 6 This is a schematic diagram of the first type of sealing nail at a second angle in an embodiment of this application; Figure 7 This is a cross-sectional view of the mating section of the first type of sealing nail in the embodiments of this application; Figure 8 This is a schematic diagram of the guide segment of the first type of sealing nail in the embodiments of this application; Figure 9 This is a schematic diagram of the sealing nail in the pre-installed state in an embodiment of this application; Figure 10 This is a schematic diagram of the sealing nail in a sealed state in an embodiment of this application; Figure 11 This is a schematic diagram of the sealing pin in the encapsulation state in an embodiment of this application; Figure 12 This is a schematic diagram of the second type of sealing nail in an embodiment of this application; Figure 13 This is a cross-sectional view of the mating section of the second type of sealing nail in an embodiment of this application; Figure 14 This is a schematic diagram of the guide segment of the second type of sealing nail in the embodiments of this application; Figure 15 This is a schematic diagram of the third type of sealing nail in the embodiments of this application; Figure 16 This is a cross-sectional view of the mating section of the third type of sealing nail in the embodiments of this application.

[0008] Explanation of reference numerals in the attached figures: 1. Sealing pin; 101. Sealing section; 102. Mating section; 102a. Mating surface; 102b. Ventilation surface; 1021. First mating area; 1022. Second mating area; 103. Guide section; 1031. Guide area; 104. Ventilation space; 1041. Through groove; 10411. First opening area; 1042. Groove; 10421. Second opening area; 1043. Sub-ventilation area; 1044. Third opening area; 105. Limiting groove; 2. Injection hole; 3. Cover plate body; 301. Countersunk hole; 4. Sealing components. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0010] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0011] Figure 1 The content shown is a schematic diagram of sealing nail 1, such as... Figure 1 As shown, the sealing pin 1 may include a sealing section 101 for sealing the injection hole 2 and a mating section 102 connected thereto. To ensure a sealing effect, the sealing section 101 and the injection hole 2 are interference-fitted, while the mating section 102 and the injection hole 2 are clearance-fitted, forming a venting channel. Figure 1 and Figure 2 Taking the sealing nail shown as an example, Figure 2 This is a cross-sectional view of the sealing nail 1. The circumferential side of the mating section 102 of the sealing nail 1 is alternately provided with multiple mating surfaces 102a and venting surfaces 102b. The mating surface 102a is clearance-fitted with the side wall of the injection hole 2, and the venting surface 102b and the injection hole 2 form a ventilation channel, so as to use the ventilation channel to perform operations such as drawing negative pressure on the battery and introducing helium.

[0012] Figure 3 and Figure 4 The diagrams shown illustrate the pre-installed and sealed states of the sealing pin 1. In practice, after the battery undergoes secondary electrolyte injection, the sealing pin 1 is first pre-installed into the injection hole 2. Since a venting channel is formed between the mating section 102 and the injection hole 2, a helium test is required after battery manufacturing to ensure the battery's sealing performance and quality. Therefore, after pre-installing the sealing pin 1 into the injection hole 2, a negative pressure is drawn into the battery through the formed venting channel, and helium gas is introduced. After the helium gas is introduced, the sealing pin 1 is fully embedded into the injection hole 2 to achieve a final seal, facilitating subsequent helium testing of the battery. However, the application of the aforementioned sealing pin 1 may affect battery yield, especially in the pre-installed state of the sealing pin 1. Before performing negative pressure extraction and helium gas introduction operations, the mating section 102 of the sealing pin 1 needs to be installed in the injection hole 2. During this period, if the battery is transported, the sealing pin 1 may become misaligned or even fall off due to vibration or other interference factors, affecting the sealing effect of the sealing pin 1 on the injection hole 2. In addition, when using the ventilation channel for negative pressure extraction and helium gas introduction, especially during the helium gas introduction stage, due to the dimensional deviation between the sealing section 101 and the mating section 102, the sealing section 101 may block part of the injection hole 2 under the action of gas pressure, reducing the smoothness of helium gas delivery in the ventilation channel, and thus affecting the helium gas injection effect.

[0013] This application provides a sealing pin 1, which is suitable for sealing the liquid injection hole 2 of a battery. The sealing pin 1 includes a sealing section 101 and a mating section 102 connected to each other. The sealing section 101 is interference-fitted with the liquid injection hole 2. The mating section 102 is interference-fitted with the liquid injection hole 2. The side wall of the mating section 102 is provided with a venting space 104, which is connected to the interior of the battery.

[0014] Figure 5 and Figure 6 This is a schematic diagram of the sealing pin 1 at different angles. Specifically, the sealing pin 1 provided in this application includes a sealing section 101 and a mating section 102 connected to each other, used to seal the battery's liquid injection hole 2. Figures 9-11 This is a schematic diagram of the sealing pin 1 in the pre-installed state, the sealed state, and the encapsulated state; as shown. Figure 7 As shown, the mating section 102 is provided with a venting space 104. When the sealing pin 1 is in the pre-installed state, the sealing section 101 of the sealing pin 1 does not enter the injection hole 2, and its mating section 102 is interference-fitted with the injection hole 2, so it does not effectively seal the injection hole 2. At this time, the part of the venting space 104 located on the side wall of the mating section 102 is exposed relative to the injection hole 2, so that the venting space 104 can be connected to the outside of the battery, thereby connecting the inside of the battery with the outside. Figure 10 and Figure 11As shown, when the sealing pin 1 is in a sealed state, the sealing section 101 enters the injection hole 2. Since both are interference-fitted with the injection hole 2, the sealing section 101 can block the upper port of the injection hole 2, while the fitting section 102 passes through the injection hole 2 and has at least partially entered the battery. At this time, the ventilation space 104 is no longer connected to the outside of the battery, so that the sealing pin 1 can effectively seal the injection hole 2.

[0015] For example, the sealing section 101 and the mating section 102 of the sealing nail 1 can be manufactured using an integral process, ensuring the integrity of the sealing nail 1 structure and its sealing effect. To ensure the sealing performance and service life of the sealing nail 1, corrosion-resistant materials, such as rubber, can be selected.

[0016] In specific implementation, such as Figure 9 As shown, after the battery completes the secondary electrolyte injection, the sealing pin 1 can be pre-inserted into the injection hole 2 so that the mating section 102 is in a pre-installed state. Since the mating section 102 of the sealing pin 1 and the injection hole 2 are interference fits, compared with transition fits or clearance fits, the interference fit can enhance the firmness of the sealing pin 1 in the injection hole 2, avoid assembly problems such as skewing or falling off during the transfer stage, and improve the resistance to external vibration and other interference. In addition, in order to ensure that operations such as drawing negative pressure and introducing helium can be performed when the sealing pin 1 is in the pre-installed state, the ventilation space 104 of the mating section 102 is connected to the inside of the battery. In this way, when the sealing pin 1 is in the pre-installed state, the ventilation space 104 can form a vent structure with the side wall of the injection hole 2, so as to connect the internal and external environment of the battery to perform the drawing negative pressure and introducing helium operations. Meanwhile, since the mating section 102 and the injection hole 2 adopt an interference fit, the stability of the mating section 102 and the injection hole 2 is improved in the pre-installed state, which helps to reduce the interference of the sealing nail 1 during the gas pressure transmission process and prevent it from sliding or shifting during the negative pressure extraction or helium passage process, so as to prevent the sealing section 101 from moving and causing the gas port structure to be closed, thus ensuring the smooth flow of gas.

[0017] Furthermore, such as Figure 10 As shown, after the negative pressure extraction or helium gas introduction stage is completed, the pusher of the pin insertion device can be used to apply a pushing force to the sealing pin 1, so that the sealing section 101 of the sealing pin 1 at least partially enters the injection hole 2. At this time, the sealing pin 1 switches from the pre-installed state to the sealed state. Since the sealing section 101 of the sealing pin 1 is interference-fitted with the injection hole 2, the sealing section 101 can seal the upper port of the injection hole 2 after entering the injection hole 2. In this stage, the mating section 102 passes through the injection hole 2 and has at least partially entered the battery. The ventilation space 104 is no longer connected to the outside of the battery, so that the sealing section 101 can effectively seal the injection hole 2.

[0018] In some embodiments, the ventilation space 104 includes a through groove 1041 formed in the mating section 102. The through groove 1041 extends through the mating section 102 along a height direction perpendicular to the mating section 102 to form two opposing first opening areas 10411 on the sidewall of the mating section 102. The through groove 1041 divides the sidewall of the mating section 102 into two opposing first mating areas 1021. The ratio of the curvature of each first opening area 10411 to the curvature of a first mating area 1021 is within 0.25 to 0.5.

[0019] Specifically, when the sealing pin 1 is in the pre-installed state, the inside of the battery can be connected to the external environment through the ventilation space 104, so as to perform operations such as drawing negative pressure into the battery and introducing helium gas. Figures 9-11 As shown, the ventilation space 104 may include a through groove 1041 disposed in the mating section 102. The through groove 1041 penetrates the mating section 102 along a direction perpendicular to its height. Thus, the through groove 1041 can form first vents on opposite sides of the sidewall of the mating section 102 for connecting to the outside of the battery, and a second vent at the bottom of the sealing nail 1 for connecting to the inside of the battery. Through the first and second vents, the through groove 1041 can establish communication with the inside and outside of the battery respectively, ensuring that the battery can be subjected to negative pressure extraction and helium gas introduction. Additionally, as... Figure 5 and Figure 6 As shown, a through groove 1041 is opened in the mating section 102 as a ventilation space 104, which can also simplify the overall structure of the sealing nail 1 and reduce the precision requirements for the manufacturing of the sealing nail 1.

[0020] When the sealing pin 1 is in a sealed state within the injection hole 2, such as Figure 10 At least a portion of the sealing section 101 of the sealing nail 1 enters the injection hole 2, and a portion of its mating section 102 enters the battery interior. The portion of the through groove 1041 located on the side wall of the mating section 102 is no longer connected to the outside of the battery, so that the sealing section 101 blocks the upper port of the injection hole 2, thereby isolating the battery interior from the external environment and achieving effective sealing of the injection hole 2.

[0021] Because the mating section 102 of the sealing pin 1 is interference-fitted with the injection hole 2, a large force needs to be applied to the sealing pin 1 to assemble the mating section 102 into the injection hole 2, which increases the difficulty of assembling the sealing pin 1. Figure 9 and Figure 10As shown, the through groove 1041 located at the bottom of the mating section 102 of the sealing nail 1 penetrates its sidewall along the height direction perpendicular to the mating section 102, so as to divide the mating section 102 into two relatively spaced sub-matting parts, and the two sub-matting parts are located on opposite sides of the through groove 1041. When the mating section 102 is pre-installed into the injection hole 2, the sidewall of the injection hole 2 will apply a compressive force to the two sub-matting parts, causing the two sub-matting parts to deform in the direction of the through groove 1041, so that the mating section 102 is easier to assemble into the injection hole 2, further reducing the assembly difficulty of the sealing nail 1.

[0022] Furthermore, Figure 7 This is a cross-sectional view of the mating section 102 of the sealing nail 1 in this embodiment, as shown below. Figures 5-7 As shown, the through groove 1041 extends through the mating section 102 along a direction perpendicular to its height, dividing the mating section 102 into two parts, namely two sub-matting parts. The through groove 1041 can form two opposing first opening areas 10411 on the sidewall of the mating section 102, and can divide the sidewall of the mating section 102 into two opposing first mating areas 1021. The mating section 102 is press-fitted with the inner sidewall of the injection hole 2 through the first mating areas 1021 to increase the installation stability of the mating section 102 within the injection hole 2. When the sealing pin 1 is in a pre-installed state, the venting space 104 can be connected to the outside of the battery through the first opening area 10411 to facilitate operations such as drawing negative pressure and introducing helium. Furthermore, as... Figure 8 As shown, for the mating section 102, the ratio of the curvature of a first opening area 10411 on the side wall of the mating section 102 to the curvature of a first mating area 1021 can be controlled within 0.25 to 0.5. This can ensure the reliability of the mating between the mating section 102 and the injection hole 2, and also ensure that the ventilation space 104 has good ventilation performance.

[0023] As an alternative embodiment, the ventilation space 104 includes two oppositely spaced grooves 1042, which are formed on the sidewall of the mating section 102 to create two opposite second opening areas 10421 on the sidewall of the mating section 102. The two grooves 1042 divide the sidewall of the mating section 102 into two opposite second mating areas 1022, and the ratio of the curvature of each second opening area 10421 to the curvature of a second mating area 1022 is within 0.25 to 0.5.

[0024] Specifically, when the sealing nail 1 is pre-installed inside the injection hole 2, the inside of the battery can be connected to the external environment through the ventilation space 104, so as to perform operations such as drawing negative pressure and introducing helium into the battery. Figure 10 The content shown is a schematic diagram of the sealing nail 1 in this embodiment, such as... Figure 12As shown, the ventilation space 104 may include two grooves 1042 that are spaced apart from each other. The two grooves 1042 are respectively opened on opposite sides of the mating section 102. For the grooves 1042, when the sealing nail 1 is in the pre-installed state, each groove 1042 can form a third air port on opposite sides of the side wall of the mating section 102 to connect to the outside of the battery, and a fourth air port is formed at the bottom of the sealing nail 1 to connect to the inside of the battery. Through the third air port and the fourth air port, the grooves 1042 can establish a communication relationship with the inside and outside of the battery respectively, ensuring that the battery can be evacuated and helium gas introduced.

[0025] When the sealing pin 1 is in a sealed state in the injection hole 2, at least a portion of the sealing section 101 of the sealing pin 1 enters the injection hole 2, and a portion of its mating section 102 enters the battery interior. The portion of the groove 1042 located on the side wall of the mating section 102 is no longer connected to the outside of the battery, so that the sealing section 101 blocks the upper port of the injection hole 2, thereby isolating the battery interior from the external environment and achieving effective sealing of the injection hole 2.

[0026] Furthermore, Figure 13 This is a cross-sectional view of the mating section 102 of the sealing nail 1 in this embodiment, as shown below. Figure 12 and Figure 13 As shown, two grooves 1042 are recessed on the sidewall of the mating section 102 to divide the mating section 102 into two parts. The two grooves 1042 can form two opposing second opening areas 10421 on the sidewall of the mating section 102, and can also divide the sidewall of the mating section 102 into two opposing second mating areas 1022. The mating section 102 is press-fitted with the inner wall of the injection hole 2 through the second mating areas 1022 to increase the installation stability of the mating section 102 within the injection hole 2. When the sealing pin 1 is in the pre-installed state, the venting space 104 can be connected to the outside of the battery through the second opening area 10421 to facilitate operations such as drawing negative pressure and introducing helium. Furthermore, as... Figure 13 As shown, for the mating section 102, the ratio of the curvature of a second opening area 10421 to the curvature of a second mating area 1022 on the side wall of the mating section 102 can be controlled within 0.25 to 0.5. This can ensure the reliability of the mating between the mating section 102 and the injection hole 2, and also ensure that the ventilation space 104 has good ventilation performance. For example, the groove 1042 can adopt a balanced groove structure, that is, the end of the groove 1042 near the sealing section 101 is closed, and the end away from the sealing section 101 is open. This can reduce the processing difficulty of the groove 1042 and ensure that the formed ventilation space 104 meets the functional requirements of the sealing nail 1 in different states.

[0027] In some embodiments, the sealing pin 1 further includes a guide section 103 connected to the end of the mating section 102 away from the sealing section 101, and the radial dimension of the guide section 103 decreases along the height direction of the mating section 102; the ventilation space 104 extends through the guide section 103 along the height direction of the mating section 102 to form two opposing third opening areas 1044 on the sidewall of the guide section 103, dividing the sidewall of the guide section 103 into two opposing guide areas 1031, and the ratio of the curvature of each third opening area 1044 to the curvature of a guide area 1031 is within 0.25 to 0.5.

[0028] like Figure 5 and Figure 6 as well as Figures 9-11 As shown, the sealing pin 1 also includes a guide section 103 for guiding the mating section 102 into the injection hole 2 in a pre-installed state. The guide section 103 is located at the end of the mating section 102 away from the sealing section 101. When the sealing pin 1 is installed into the injection hole 2, the guide section 103 allows the mating section 102 and the sealing section 101 to enter the injection hole 2 sequentially, reducing the difficulty of introducing the sealing pin 1 into the injection hole 2 and improving the assembly efficiency of the sealing pin 1.

[0029] like Figure 5 and Figure 6 ,as well as Figures 9-11 As shown, along the arrangement direction of the sealing section 101, mating section 102, and guiding section 103 of the sealing pin 1, the guiding section 103 can be configured as a frustum-shaped structure with a gradually decreasing cross-sectional area (i.e., radial dimension along the height direction of the mating section 102), which facilitates the rapid insertion of the sealing pin 1 into the injection hole 2. Furthermore, along the height direction of the mating section 102, a venting space 104 extends through the guiding section 103 to form two opposing third opening regions 1044 on the sidewall of the guiding section 103, thereby connecting the venting space 104 with the interior of the battery through the third opening regions 1044.

[0030] Furthermore, Figure 8 and Figure 14 These are all schematic diagrams of the guide section 103 of the sealing pin 1, such as... Figure 8 and 14 As shown, for the guide section 103, after the ventilation space 104 penetrates the mating section 102 along the height direction, the sidewall of the guide section 103 can be divided into two opposing guide areas 1031. By controlling the ratio of the arc of each third opening area 1044 to the arc of a guide area 1031 within 0.25 to 0.5, the ventilation space 104 can be guaranteed to have good ventilation performance, and the guide section 103 can also have sufficient guide areas 1031 so that the guide section 103 and the mating section 102 can enter the injection hole 2 in sequence.

[0031] In some embodiments, the diameter of the sealing section 101 is the same as the diameter of the mating section 102; such as Figure 5 and Figure 6 ,as well as Figures 9-12 As shown, by setting the diameter of the sealing section 101 of the sealing nail to be equal to the diameter of the mating section 102, the flatness of the outer surface of the sealing nail 1 can be guaranteed, and the sealing section 101 and the mating section 102 can be prevented from affecting the fit between the connection between them and the injection hole 2 when the sealing nail 1 is in a sealed state due to the difference in diameter, thereby ensuring the sealing performance of the sealing nail 1.

[0032] As an alternative embodiment, the cross-section of the mating section 102 perpendicular to the height direction of the mating section 102 is elliptical, and the orthographic projection of the cross-section in the height direction of the mating section 102 is tangent to the orthographic projection of the sealing section 101. The ventilation space 104 includes two sub-ventilation areas 1043, which are arranged on opposite sides of the mating section 102 in the minor axis direction of the cross-section.

[0033] In some cases, the sealing pin 1 needs to have a larger ventilation space 104 to improve ventilation efficiency. Specifically, when the sealing pin 1 is in the pre-installed state in the injection hole 2, the inside of the battery can be connected to the outside of the battery through the ventilation space 104 on the mating section 102, so as to facilitate operations such as drawing negative pressure into the battery and introducing helium. Figure 15 and Figure 16 This is a schematic diagram of the sealing nail 1 and a cross-sectional view of its mating section 102 in this embodiment, as shown below. Figure 15 and Figure 16 The cross-section of the mating section 102 along its height direction is elliptical, and the orthographic projection of this cross-section in the height direction of the mating section 102 is tangent to the orthographic projection of the sealing section 101. Therefore, the mating section 102 connected to the end of the sealing section 101 is an elliptical cylindrical structure. When the mating section 102 of the sealing nail 1 is in a pre-installed state in the injection hole 2, the side wall portion of the mating section 102 corresponding to the long axis end of the elliptical cross-section is interference-fitted with the injection hole 2, which can ensure the stability of the mating section 102 in the injection hole 2. Meanwhile, the ventilation space 104 may include two sub-ventilation zones 1043, which are located on the sidewalls of the mating section 102 and are set on opposite sides of the minor axis of the elliptical cross-section. Since the orthographic projection of the cross-section of the mating section 102 is tangent to the orthographic projection of the sealing section 101, the mating area between the mating section 102 and the injection hole 2 can be reduced, the space of the two sub-ventilation zones 1043 can be increased, the sealing pin 1 can be prevented from falling off in the pre-installed state, and sufficient ventilation space 104 can be formed between the sealing pin 1 and the injection hole 2, which is beneficial to improving the smoothness and transmission efficiency of gas flow during the negative pressure extraction and helium introduction process.

[0034] It should be noted that the space of the sub-ventilation zone 1043 can be indirectly adjusted by changing the size of the mating section 102 of the sealing nail 1 in this embodiment, which will not be elaborated here.

[0035] When the sealing pin 1 is in a sealed state in the injection hole 2, at least a portion of the sealing section 101 of the sealing pin 1 enters the injection hole 2, and a portion of its mating section 102 enters the battery. At this time, the portions of the two sub-venting zones 1043 located on the side wall of the mating section 102 are no longer connected to the outside of the battery, so that the sealing section 101 blocks the upper port of the injection hole 2, thereby isolating the inside of the battery from the external environment and achieving effective sealing of the injection hole 2.

[0036] In some embodiments, the sealing section 101 is provided with a limiting groove 105 for providing a mating position for the insertion device, the limiting groove 105 being located away from the sealing section 101 and away from the mating section 102.

[0037] After the battery is fully charged with helium, a pushing force can be applied to the sealing section 101 of the sealing pin 1 using a pin insertion device. The pusher pin of the pin insertion device pushes the sealing section 101 into the injection hole 2, allowing it to enter and seal its upper port. To ensure the sealing pin 1 moves stably along the injection hole 2 during insertion, as follows... Figure 5 , Figures 9-11 As shown, a limiting groove 1042 can be provided at the end of the sealing section 101 away from the mating section 102. The limiting groove 1042 can be adapted to the working end of the pusher in the pin insertion device to prevent the pusher from slipping or moving during the application of force, thereby ensuring the stability of the sealing pin 1 installation and the sealing effect on the injection hole 2.

[0038] Furthermore, after helium is filled into the battery, the internal pressure of the battery increases. Since the sealing pin 1 is made of elastic material, the top of its sealing section 101 may form a small bulge due to the pressure, which may affect the subsequent sealing of the injection hole 2. To address this, by setting a limiting groove 1042 at the end of the sealing section 101 away from the mating section 102, the deformation of the top of the sealing section 101 can be buffered, the degree of deformation at the top can be reduced, and the subsequent sealing of the injection hole 2 can be carried out smoothly.

[0039] Based on the same inventive concept, this application also provides a cover plate assembly, which includes a cover plate body 3, the cover plate body 3 having an injection hole 2 for injecting electrolyte, and a sealing pin 1 as described in any of the above embodiments, wherein the sealing pin 1 is interference-fitted with the injection hole 2.

[0040] Specifically, regarding the cover assembly, the cover assembly provided in this application is used to isolate and encapsulate the battery casing; such as Figures 7 to 9As shown, the cover plate assembly may include a cover plate body 3 and a sealing pin 1. The cover plate body 3 has an injection hole 2, which is used as an injection channel for electrolyte. The sealing pin 1 and the injection hole 2 are interference fit. When the sealing pin 1 enters the injection hole 2, the injection hole 2 can be effectively sealed by the sealing pin 1.

[0041] Furthermore, since the cover plate assembly includes the sealing nail 1 described in any of the above embodiments, it possesses all the advantages and beneficial effects of the cover plate assembly, which will not be repeated here.

[0042] For example, the cover assembly can be formed of materials such as aluminum alloy, which can improve the overall strength of the cover assembly.

[0043] For example, in addition to the cover body 3, the cover assembly may also include structures such as a lower plastic part and an upper plastic part for insulating the cover body 3, which will not be described in detail here.

[0044] In some embodiments, the top of the cover plate body 3 is provided with a countersunk hole 301 that communicates with the injection hole 2, and the diameter of the countersunk hole 301 is larger than the diameter of the sealing section 101.

[0045] To ensure that the sealing pin 1 functions appropriately under different conditions, the structure of the injection hole 2 needs to be compatible with the structure of the sealing pin 1. Specifically, such as... Figures 9-11 As shown, the top of the cover plate body 3 is provided with a countersunk hole 301 that communicates with the liquid injection hole 2. The diameter of the countersunk hole 301 is larger than the diameter of the sealing section 101. In this way, when the sealing nail 1 is in the pre-installed state in the liquid injection hole 2, a gap structure communicating with the ventilation space 104 will be formed between the countersunk hole 301 and the sealing section 101. Through the gap structure and the ventilation space 104, negative pressure can be drawn and helium can be injected into the battery.

[0046] In some embodiments, a sealing member 4 for sealing the sealing nail 1 is provided in the countersunk hole 301. The diameter of the sealing block is larger than the diameter of the injection hole 2 and is fixedly connected to the cover plate body 3.

[0047] During battery use, the gas generated during operation may increase internal pressure. To prevent the sealing pin 1 from falling out of the injection hole 2 due to prolonged pressure, further reinforcement measures can be taken for the sealing pin 1. For example... Figure 11 As shown, when the sealing nail 1 is sealed using the sealing component 4, since the diameter of the injection hole 2 is larger than that of the injection hole 2, a stepped structure is formed between them. In this way, by setting the sealing component 4 with a diameter larger than that of the injection hole 2 in the countersunk hole 301 and fixedly connected to the cover plate body 3, the sealing nail 1 can be sealed and reinforced, further enhancing the installation firmness of the sealing nail 1 in the injection hole 2 and ensuring its sealing reliability to the injection hole 2.

[0048] For example, the sealing block can be made of the same material as the cover plate body 3, such as aluminum alloy, and the cover plate body 3 and the sealing component 4 can be connected by welding to ensure material consistency.

[0049] Furthermore, when the sealing component 4 is fixedly connected to the cover plate body 3 by welding, since the diameter of the sealing component 4 is larger than the diameter of the injection hole 2, it can effectively shield and isolate the welding area, which can prevent the heat generated during the welding process from being directly conducted to the sealing nail 1, prevent the sealing nail 1 from being damaged by heat, and ensure its structural integrity and sealing performance.

[0050] Based on the same inventive concept, this application also provides a battery, including a cover assembly as described in any of the above embodiments.

[0051] Specifically, in addition to the cover plate assembly mentioned above, the battery also includes a casing, an electrode assembly, positive and negative terminal subassemblies, etc. The casing has an opening, and the cover plate assembly is connected to the casing and encloses it to form a cavity, which is the internal space of the battery, used to accommodate the electrode assembly and electrolyte. The positive and negative terminal subassemblies are disposed on the cover plate assembly and are electrically connected to the electrode assembly inside the cavity to form the battery's circuit structure, which will not be described in detail here.

[0052] Furthermore, since the battery possesses the cover assembly described in any of the above embodiments, it has all the advantages and beneficial effects of the cover assembly, which will not be repeated here.

[0053] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0054] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0055] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0056] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0057] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0058] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A sealing spike suitable for sealing a filling hole of a battery, characterized in that, The sealing pin includes a sealing section and a mating section that are connected together; The sealing section is interference-fitted with the injection hole; the fitting section is interference-fitted with the injection hole, and the side wall of the fitting section is provided with a venting space, which is connected to the interior of the battery.

2. The sealing nail according to claim 1, characterized in that, The ventilation space includes a through groove formed in the mating section, the through groove penetrating the mating section along a direction perpendicular to the height of the mating section, so as to form two opposing first opening areas on the side wall of the mating section; The through groove divides the sidewall of the mating section into two opposing first mating areas, and the ratio of the curvature of each first opening area to the curvature of the first mating area is within 0.25 to 0.

5.

3. The sealing nail according to claim 1, characterized in that, The ventilation space includes two grooves that are spaced apart from each other. The two grooves are formed on the side wall of the mating section to form two opposing second opening areas on the side wall of the mating section, respectively. The two grooves divide the sidewall of the mating section into two opposing second mating areas, and the ratio of the curvature of each second opening area to the curvature of a second mating area is within 0.25 to 0.

5.

4. The sealing nail according to claim 1, characterized in that, It also includes a guide section connected to the end of the mating section away from the sealing section, wherein the radial dimension of the guide section decreases along the height direction of the mating section; The ventilation space extends through the guide section along the height of the mating section, forming two opposing third opening areas on the sidewall of the guide section, thus dividing the sidewall of the guide section into two opposing guide areas. The ratio of the curvature of each of the third opening regions to the curvature of one of the guide regions is within 0.25 to 0.

5.

5. The sealing nail according to any one of claims 2 to 4, characterized in that, The diameter of the sealing section is the same as the diameter of the mating section.

6. The sealing nail according to claim 1, characterized in that, The cross-section of the mating section perpendicular to its height direction is elliptical, and the orthographic projection of this cross-section along the height direction of the mating section is tangent to the orthographic projection of the sealing section. The ventilation space includes two sub-ventilation zones, which are located on opposite sides of the mating section along the minor axis of the cross-section.

7. The sealing nail according to claim 1, characterized in that, The sealing section has a limiting groove for providing a docking position for the insertion device, and the limiting groove is located at the end of the sealing section away from the mating section.

8. A cover plate assembly, characterized in that, include: The cover plate body has an injection hole for injecting electrolyte; And a sealing pin as described in any one of claims 1-6, wherein the sealing pin is interference-fitted with the injection hole.

9. The cover plate assembly according to claim 8, characterized in that, The top of the cover plate body has a countersunk hole that communicates with the injection hole. The diameter of the countersunk hole is larger than the diameter of the sealing section.

10. The cover plate assembly according to claim 9, characterized in that, The countersunk hole is provided with a sealing element for sealing the sealing nail. The diameter of the sealing element is larger than the diameter of the injection hole, and it is fixedly connected to the cover plate body.

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