A sealing ring folding riveting top cover

Abstract

The utility model discloses a kind of sealing ring fold riveting top cover, base plate and support frame installed in the lower side of base plate, positive electrode and negative electrode are equipped on the base plate, the pole of positive electrode and negative electrode is installed in the mounting hole inside of base plate, sealing ring is equipped between the base plate and pole, the upper end of the pole is equipped with pressing plate, and insulating plate is equipped between the lower end surface of pressing plate and the upper end surface of base plate, one end of the sealing ring is located between base plate and pole, the other end of sealing ring is located between base plate and pressing plate. The sealing ring of the sealing ring fold riveting top cover not only forms sealing in the radial direction and axial direction of base plate and pole, but also is compressed under riveting force by its upper end, effective second resealing is formed between the upper end surface of base plate and the lower end surface of pressing plate. This completely solves the problem that electrolyte seeps into the gap between pressing plate and base plate in conventional structure, and improves the sealing property.

Description

Technical Field

[0001] This utility model relates to the field of battery component technology, and more specifically, to a sealing ring folding and riveting top cover for batteries. Background Technology

[0002] With the rapid development of electric vehicles and portable electronic devices, the demand for batteries with high energy density, long lifespan, and high safety is increasing. In the battery manufacturing process, especially for batteries using a riveted structure to connect the terminals and the top cover (substrate), the sealing performance of the top cover is crucial. In traditional riveted battery top cover structures, a sealing ring is typically placed between the substrate and the terminal (rivet) to prevent electrolyte leakage from the connection. However, this single sealing ring method mainly focuses on the radial and axial mating areas between the substrate and the terminal, often failing to effectively form a reliable seal between the upper side of the substrate and the pressure plate.

[0003] Specifically, in existing riveted top cover designs, the positive and negative electrode posts pass through the substrate and are fixed by pressure plates during riveting. During the electrolyte filling process, due to structural defects, electrolyte may seep from the outside of the battery into the gap between the pressure plates and the substrate. Once the electrolyte enters these tiny gaps, under conditions such as prolonged battery use or temperature changes, the salts contained within may crystallize. These crystals not only occupy valuable space and affect the tight fit of components, but more importantly, they may form conductive paths between electrodes or between components at different potentials, leading to micro-short circuits inside the battery, and even causing premature battery failure or safety incidents.

[0004] Furthermore, traditional designs also face similar sealing challenges when installing and sealing the positive electrode weak conductor plate and the negative electrode insulating plate. How to ensure the sealing integrity between these components and the top cover while guaranteeing connection strength through riveting is a problem that existing technologies urgently need to solve. Therefore, there is a lack of a riveted top cover structure in the current technology that can simultaneously solve the sealing problems between the electrode post and the substrate, as well as between the upper side of the substrate and the pressure plate. Utility Model Content

[0005] The purpose of this invention is to solve the sealing defects of traditional riveted battery top covers in the prior art. That is, a single sealing ring can only form a seal between the substrate and the terminal post, but cannot form an effective seal between the upper side of the substrate and the pressure plate. This causes the electrolyte to seep into the gap between the pressure plate and the substrate during liquid injection, which in turn causes electrolyte crystallization and may lead to a short circuit in the battery.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A sealing ring folding and riveting top cover includes: a base plate and a support frame installed on the lower side of the base plate. The base plate is provided with a positive electrode and a negative electrode. The poles of the positive electrode and the negative electrode are installed inside the mounting holes of the base plate. A sealing ring is provided between the base plate and the poles. A pressure plate is provided at the upper end of the poles. An insulating plate is provided between the lower end face of the pressure plate and the upper end face of the base plate.

[0008] One end of the sealing ring is located between the substrate and the pole post, and the other end of the sealing ring is located between the substrate and the pressure plate.

[0009] Furthermore, the space between the lower end face of the substrate and the pole post is a first space, the space between the inner wall of the mounting hole and the side of the pole post is a second space, and the space between the upper end face of the substrate and the lower end face of the pressure plate is a third space.

[0010] Furthermore, the first space, the second space, and the third space cooperate with the sealing ring.

[0011] Furthermore, the lower end of the sealing ring is located inside the first space, the middle part of the sealing ring is located inside the second space, and the upper end of the sealing ring is located inside the third space.

[0012] Furthermore, the upper end of the inner wall of the mounting hole is chamfered, the pressure plate is chamfered at the corresponding position of the sealing ring, and the upper end of the sealing ring is chamfered at the corresponding position of the pressure plate.

[0013] Furthermore, a weak conductive plate is provided between the positive electrode pressure plate and the substrate, and an insulating plate is provided between the negative electrode pressure plate and the substrate.

[0014] Beneficial effects: Compared with the prior art, this application has the following advantages:

[0015] 1. By raising the sidewall of the sealing ring, with one end positioned between the substrate and the electrode post, and the other end extending upwards between the substrate and the pressure plate, a second layer of sealing is achieved during the riveting process. This seal not only forms radial and axial seals between the substrate and the electrode post, but also, through its upper end being folded and compressed under the riveting force, forms an effective second seal between the upper surface of the substrate and the lower surface of the pressure plate. This completely solves the problem of electrolyte seeping into the gap between the pressure plate and the substrate in traditional structures, fundamentally eliminating the risk of battery short circuits caused by electrolyte crystallization.

[0016] 2. This utility model utilizes the chamfer design on the pressure plate and the base plate to precisely guide the sealing ring to fold and compress during the riveting process, ensuring that the sealing ring can efficiently and accurately form a tight seal in the target area, thereby improving the reliability and consistency of the seal.

[0017] 3. This utility model achieves dual sealing between the electrode post and the substrate, as well as between the pressure plate and the substrate, through a cleverly designed sealing ring. This simplifies the structure, avoids the complexity of using multiple independent sealing components, and improves the long-term stability and safety of the battery. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the sealing ring folded and riveted top cover according to this utility model;

[0019] Figure 2 This is a cross-sectional view of the sealing ring folded and riveted top cover according to this utility model;

[0020] Figure 3 This is a schematic diagram of the pre-riveting structure of the sealing ring folded riveted top cover according to this utility model;

[0021] Figure 4 This is a partially enlarged schematic diagram of the sealing ring folded and riveted top cover according to this utility model after riveting;

[0022] Reference numerals: 1-substrate, 101-mounting hole, 102-first space, 103-second space, 104-third space, 2-support frame, 3-pole post, 4-sealing ring, 5-insulating plate, 6-pressure plate, 7-weak guide plate. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Example 1

[0025] Reference Figure 1 and Figure 2 As shown, this utility model provides a sealing ring folding and riveting top cover, which includes a base plate 1 and a support frame 2 mounted on the lower side of the base plate 1. The base plate 1 is provided with a positive electrode and a negative electrode for a battery. The positive and negative electrode posts 3 are installed inside the mounting holes 101 of the base plate 1. In order to achieve a reliable seal, a sealing ring 4 is provided between the base plate 1 and the electrode posts 3. In addition, a pressure plate 6 is provided at the upper end of the electrode posts 3, and an insulating plate 5 is provided between the lower end face of the pressure plate 6 and the upper end face of the base plate 1.

[0026] The core feature of this invention lies in the unique design and positioning of the sealing ring 4. Specifically, one end of the sealing ring 4 is located between the substrate 1 and the terminal post 3, providing a basic seal in the radial and axial directions as the terminal post 3 passes through the substrate 1. More importantly, the other end of the sealing ring 4 extends upwards, located between the substrate 1 and the pressure plate 6. During the riveting assembly process, when the pressure plate 6 is subjected to clamping force, the upwardly extending portion of the sealing ring 4 will fold and compress under the action of the pressure plate 6 and the substrate 1, thereby forming an additional, reliable sealing layer between the lower end face of the pressure plate 6 and the upper end face of the substrate 1. This dual sealing mechanism greatly enhances the sealing performance of the riveted top cover during battery electrolyte filling and long-term use, effectively preventing electrolyte from seeping in from the gaps on the upper side of the substrate 1, thus avoiding the risk of battery short circuit caused by electrolyte crystallization.

[0027] Example 2

[0028] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the sealing ring folding and riveting top cover of this utility model further details the mating space between the sealing ring 4 and the various components of the top cover. Specifically, the space between the lower end face of the base plate 1 and the pole post 3 is defined as the first space 102. This space is used to accommodate the downwardly extending portion of the sealing ring 4, providing radial and axial sealing to the pole post 3. The space between the inner wall of the mounting hole 101 and the side of the pole post 3 is defined as the second space 103. This space is mainly used to guide and mate the middle portion of the sealing ring 4, ensuring the correct position of the sealing ring 4 within the mounting hole 101, and providing radial support and sealing. The space between the upper end face of the base plate 1 and the lower end face of the pressure plate 6 is defined as the third space 104. This space is the key area where the upwardly extending portion of the sealing ring 4 folds over after riveting to form a second seal.

[0029] To ensure that the sealing ring 4 can fully exert its sealing function, the first space 102, the second space 103, and the third space 104 are all tightly fitted with the sealing ring 4. More specifically, from bottom to top, the lower end of the sealing ring 4 is precisely located inside the first space 102, ensuring a seal between the pole post 3 and the lower part of the substrate 1. The middle part of the sealing ring 4 is located inside the second space 103, closely fitting the inner wall of the mounting hole 101, providing a stable mid-section seal. The upper end of the sealing ring 4 is located inside the third space 104. This part is key to achieving the folding seal; its structure and material design allow it to fold upward and outward when the riveting is pressed, and then be compressed between the pressure plate 6 and the substrate 1 to form a tight sealing surface.

[0030] To further optimize the folding effect of the sealing ring 4, the preferred embodiment of this invention further includes: a chamfer on the upper end of the inner wall of the mounting hole 101, used to guide the sealing ring 4 to smoothly transition and unfold during the upward process. A chamfer is also provided at the position corresponding to the sealing ring 4 on the pressure plate 6. This chamfer applies a guiding force to the upper end of the sealing ring 4 during riveting, causing it to fold outward. Simultaneously, a chamfer is also provided at the upper end of the sealing ring 4 corresponding to the pressure plate 6. This chamfer, in conjunction with the chamfer of the pressure plate 6, further optimizes the uniformity of force during the folding process, ensuring that the sealing ring 4 can be stably and completely folded and compressed within the third space 104, thereby achieving a more reliable sealing effect. These chamfer designs are key structures ensuring the smooth folding of the sealing ring to form an effective seal, reducing assembly difficulty and improving sealing reliability.

[0031] Example 3

[0032] This invention also optimizes the connection requirements for the positive and negative electrodes of the battery. Specifically, for the positive electrode, a weak conductive plate 7 is provided between the pressure plate 6 and the substrate 1. To ensure the seal between the weak conductive plate 7 and the substrate 1, the folded portion of the sealing ring 4 also functions in this area, ensuring the integrity of the seal between the weak conductive plate 7 and the substrate 1 through its own elastic deformation and riveting pressure. For the negative electrode, an insulating plate 5 is provided between the pressure plate 6 and the substrate 1. Similarly, the folded structure of the sealing ring 4 is also applied between the insulating plate 5 and the substrate 1 to form a reliable seal, preventing electrolyte from entering the gap between the insulating plate and the substrate, thereby avoiding the risk of short circuit or leakage that may be caused by this.

[0033] This design ensures that both the weak conductive plate 7 of the positive electrode and the insulating plate 5 of the negative electrode achieve effective double sealing protection at their connection points with the substrate 1 through the same cleverly designed sealing ring 4. This not only simplifies the number of components in the battery top cover, reduces production costs and assembly complexity, but more importantly, significantly improves the long-term sealing reliability of the entire battery top cover and the safety of the battery. This invention, through a unified sealing scheme, takes into account the special structures and sealing requirements of both the positive and negative electrodes, demonstrating the universality and efficiency of its design.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sealing ring folding and riveting top cover, characterized in that, include: A substrate (1) and a support frame (2) installed on the lower side of the substrate (1). The substrate (1) is provided with a positive electrode and a negative electrode. The poles (3) of the positive electrode and the negative electrode are installed inside the mounting holes (101) of the substrate (1). A sealing ring (4) is provided between the substrate (1) and the poles (3). A pressure plate (6) is provided at the upper end of the poles (3), and an insulating plate (5) is provided between the lower end face of the pressure plate (6) and the upper end face of the substrate (1). One end of the sealing ring (4) is located between the substrate (1) and the pole post (3), and the other end of the sealing ring (4) is located between the substrate (1) and the pressure plate (6).

2. The sealing ring folded riveted top cover according to claim 1, characterized in that: The space between the lower end face of the substrate (1) and the pole post (3) is the first space (102), the space between the inner wall of the mounting hole (101) and the side of the pole post (3) is the second space (103), and the space between the upper end face of the substrate (1) and the lower end face of the pressure plate (6) is the third space (104).

3. The sealing ring folding and riveting top cover according to claim 2, characterized in that: The first space (102), the second space (103) and the third space (104) cooperate with the sealing ring (4).

4. The sealing ring folding and riveting top cover according to claim 3, characterized in that: The lower end of the sealing ring (4) is located inside the first space (102), the middle part of the sealing ring (4) is located inside the second space (103), and the upper end of the sealing ring (4) is located inside the third space (104).

5. The sealing ring folded riveted top cover according to claim 2, characterized in that: The upper end of the inner wall of the mounting hole (101) is chamfered, the pressure plate (6) and the sealing ring (4) are chamfered at the corresponding positions, and the upper end of the sealing ring (4) and the pressure plate (6) are chamfered at the corresponding positions.

6. The sealing ring folded riveted top cover according to claim 1, characterized in that: A weak conductive plate (7) is provided between the positive electrode pressure plate (6) and the substrate (1), and an insulating plate (5) is provided between the negative electrode pressure plate (6) and the substrate (1).

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