Top cover assembly and battery

Abstract

The utility model provides a top cover assembly and a battery, the top cover assembly comprises: a cover plate, which is provided with a liquid injection port; the first bearing piece is provided with a first bearing surface and an overflowing channel for a medium to pass through; the second bearing piece, the liquid injection opening, the first bearing piece and the second bearing piece are sequentially arranged in the axial direction of the liquid injection opening, the second bearing piece is provided with a second bearing face, the first bearing face is located on the surface, facing the second bearing piece, of the first bearing piece, and the second bearing face is located on the surface, facing the first bearing piece, of the second bearing piece; and a medium injected from the liquid injection port acts on the second bearing surface through the flow passage and is splashed on the first bearing surface. The utility model solves the problem that the impact of electrolyte on the diaphragm in the liquid injection process in the prior art is large.

Description

Technical Field

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

[0002] A battery consists of positive and negative electrodes, a separator, and an electrolyte. During manufacturing, after the cell is baked, it is then filled with electrolyte. However, during the electrolyte filling process, the electrolyte has a significant impact on the separator, which can easily cause the separator to fold inward, resulting in direct contact between the positive and negative electrodes. This can lead to a short circuit in the cell, rendering it unusable. Utility Model Content

[0003] The main objective of this invention is to provide a top cover assembly and a battery to solve the problem of excessive impact of electrolyte on the diaphragm during the electrolyte injection process in the prior art.

[0004] To achieve the above objectives, according to one aspect of the present invention, a top cover assembly is provided, comprising: a cover plate having an injection port; a first receiving member having a first receiving surface and a flow channel for medium to pass through; and a second receiving member, wherein the injection port, the first receiving member, and the second receiving member are arranged sequentially along the axial direction of the injection port, the second receiving member having a second receiving surface, the first receiving surface being located on the surface of the first receiving member facing the second receiving member, and the second receiving surface being located on the surface of the second receiving member facing the first receiving member, wherein the medium injected by the injection port acts on the second receiving surface via the flow channel and splashes onto the first receiving surface.

[0005] Furthermore, the first receiving component includes: a first bottom having a through flow channel; a first side portion located on the periphery of the first bottom and inclined relative to the surface of the first bottom, the surface of the first side portion away from the injection port serving as the first receiving surface.

[0006] Furthermore, the first side slopes toward the cover plate in a direction away from the first bottom.

[0007] Furthermore, the first side portion is continuously arranged along the circumference of the first bottom portion to form a ring structure, and the first bottom portion is located inside the ring structure.

[0008] Furthermore, the second receiving member includes: a second bottom, the surface of the second bottom facing the injection port serving as a second receiving surface; and a second side portion, the second side portion being located on the periphery of the second bottom and being inclined relative to the second bottom, the second bottom and the second side portion forming a receiving cavity, the receiving cavity being located on the side of the second side portion facing the injection port.

[0009] Furthermore, along the axial direction of the injection port, the depth of the receiving cavity is H1, the first receiving member includes a first bottom with a flow channel, the distance between the first bottom and the second bottom is H2, 60% ≤ H2 / H1 ≤ 80%; and / or along the direction away from the second bottom, the second side is inclined towards the cover plate.

[0010] Furthermore, the size of the flow channel is larger than the size of the injection port, and the size of the second receiving surface is larger than the size of the flow channel; and / or along the axial direction of the injection port, the orthographic projection of the first receiving member on the second receiving member is located within the range of the second receiving member, and / or the orthographic projection of the flow channel on the second receiving member is located within the second receiving surface.

[0011] Furthermore, the top cover assembly also includes multiple connecting posts, and at least one of the following locations is provided with connecting posts and connected by connecting posts: between the first receiving member and the cover plate, between the second receiving member and the cover plate, and between the first receiving member and the second receiving member.

[0012] Furthermore, the cover plate includes a top cover sheet and a lower plastic sheet located on one side of the top cover sheet, with both the first and second receiving parts disposed below the lower plastic sheet.

[0013] According to another aspect of the present invention, a battery is provided, including a battery cell, a housing, and the aforementioned top cover assembly, wherein the top cover assembly covers the opening of the housing to form an accommodating space, and the battery cell is located within the accommodating space.

[0014] By applying the technical solution of this utility model, a first receiving component and a second receiving component are sequentially arranged below the injection port on the cover plate. Specifically, the first receiving component is located below the cover plate and is directly connected to the injection port. The first receiving component has a first receiving surface for receiving the electrolyte medium splashed back from below, and also has a flow channel that allows the electrolyte medium to flow to the second receiving component through this channel. The design of the first receiving surface and the flow channel can guide the flow direction of the electrolyte medium and reduce direct impact. The second receiving component is located below the first receiving component, and a second receiving surface is provided on it. The first and second receiving surfaces are arranged facing each other. When electrolyte is injected into the filling port, it flows through the flow channel of the first receiving member into the second receiving surface of the second receiving member below. The electrolyte directly impacts the second receiving surface, thus avoiding direct impact on the separator and reducing the risk of short circuits between the positive and negative electrodes due to separator bending. Simultaneously, any electrolyte splashed after impacting the second receiving surface is blocked by the first receiving surface of the first receiving member above, then gathers and flows down the first receiving surface. In this way, the second receiving surface can absorb the impact of the electrolyte, preventing it from acting on the separator and causing battery failure; on the other hand, it also absorbs the splashes generated by the electrolyte impact. These two aspects work together to effectively prevent the electrolyte itself and splashes from impacting the separator, thereby reducing the possibility of separator bending, lowering the risk of cell short circuits, and improving cell performance and consistency. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0016] Figure 1 An exploded view of the overall structure of the top cover assembly of this utility model is shown;

[0017] Figure 2 It shows Figure 1 Main sectional view of the top cover component;

[0018] Figure 3 It shows Figure 2 Enlarged view of the top cover assembly at the first and second receiving parts;

[0019] Figure 4 An exploded view showing the mating of the first and second receiving components is shown;

[0020] Figure 5 A schematic diagram of the structure of the first receiving component is shown;

[0021] Figure 6 A schematic diagram of the second receiving component is shown.

[0022] The above figures include the following reference numerals:

[0023] 10. Cover plate; 11. Injection port; 20. First receiving component; 21. First receiving surface; 22. First bottom; 23. First side; 24. Flow channel; 30. Second receiving component; 31. Second receiving surface; 32. Second bottom; 33. Second side; 34. Receiving cavity; 40. Connecting column. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0027] To address the problem of significant impact of electrolyte on the diaphragm during the electrolyte injection process in existing technologies, this invention provides a top cover assembly and a battery.

[0028] like Figures 1 to 6 As shown, a top cover assembly in this embodiment includes: a cover plate 10, a first receiving member 20, and a second receiving member 30. The cover plate 10 is provided with an injection port 11. The first receiving member 20 has a first receiving surface 21 and a flow channel 24 for the medium to pass through. The injection port 11, the first receiving member 20, and the second receiving member 30 are arranged sequentially along the axial direction of the injection port 11. The second receiving member 30 has a second receiving surface 31. The first receiving surface 21 is located on the surface of the first receiving member 20 facing the second receiving member 30, and the second receiving surface 31 is located on the surface of the second receiving member 30 facing the first receiving member 20. The medium injected by the injection port 11 acts on the second receiving surface 31 through the flow channel 24 and splashes onto the first receiving surface 21.

[0029] In this embodiment, a first receiving member 20 and a second receiving member 30 are sequentially arranged below the injection port 11 on the cover plate 10. Specifically, the first receiving member 20 is located below the cover plate 10 and is directly connected to the injection port 11. The first receiving member 20 has a first receiving surface 21 for receiving the electrolyte medium splashed back from below, and also has a flow channel 24 to allow the electrolyte medium to flow to the second receiving member 30 through the channel. The design of the first receiving surface 21 and the flow channel 24 can guide the flow direction of the electrolyte medium and reduce direct impact. The second receiving member 30 is located below the first receiving member 20, and has a second receiving surface 31 on it. The first receiving surface 21 and the second receiving surface 31 are arranged facing each other. When electrolyte is injected into the injection port 11, the electrolyte flows through the flow channel 24 of the first receiving member 20 and onto the second receiving surface 31 of the second receiving member 30 below. The electrolyte directly impacts the second receiving surface 31, thus avoiding direct impact on the separator and reducing the risk of short circuits between the positive and negative electrodes due to separator bending. Simultaneously, electrolyte splashes after impacting the second receiving surface 31 are blocked by the first receiving surface 21 on the first receiving member 20 above, then converge on the first receiving surface 21 and flow down it. In this way, on the one hand, the second receiving surface 31 can absorb the impact of the electrolyte, preventing the electrolyte from acting on the separator and causing battery failure; on the other hand, it can also absorb the splashes generated by the impact of the electrolyte. These two aspects work together to effectively prevent the electrolyte itself and the splashed parts from impacting the separator, thereby reducing the possibility of separator bending, lowering the risk of cell short circuits, and improving cell performance and consistency.

[0030] In this embodiment, the second receiving surface 31 is the upper surface of the second receiving member 30, and the first receiving surface 21 is the lower surface of the first receiving member 20. Since the first receiving member 20 is located above the second receiving member 30, the lower surface of the first receiving member 20 and the upper surface of the second receiving member 30 form a vertically opposite positional relationship. Consequently, the first receiving surface 21 and the second receiving surface 31 are arranged vertically opposite each other, that is, the first receiving surface 21 faces the second receiving surface 31 and the second receiving surface 31 faces the first receiving surface 21.

[0031] like Figures 2 to 6As shown, in this embodiment, the first receiving member 20 has a first bottom 22, and a through hole is formed on the first bottom 22, which forms a flow channel 24. A first side portion 23 is disposed around the periphery of the first bottom 22 and is inclined relative to the surface of the first bottom 22. The first receiving surface 21 is disposed on the first side portion 23. This inclined first side portion 23 can increase the receiving area of ​​the first receiving surface 21 for the splashed medium, so that more splashed medium can impact the first receiving surface 21, thereby helping to further reduce the adverse effects of the splashed medium. Furthermore, the surface of the first side portion 23 away from the injection port 11 serves as the first receiving surface 21. Since the second receiving member 30 in this embodiment is located below the first receiving member 20, the first receiving surface 21 is actually located on the lower surface of the first side portion 23. Thus, the first receiving surface 21 and the second receiving surface 31 interact to effectively catch the electrolyte medium splashed back from the second receiving member 30, preventing the electrolyte medium from directly impacting the diaphragm below. This reduces the impact force of the electrolyte medium on the diaphragm, significantly reduces the risk of diaphragm folding, and thus reduces the possibility of cell short circuit.

[0032] like Figure 3 As shown, in this embodiment, the first side portion 23 is inclined towards the cover plate 10 in a direction away from the first bottom 22. Since the cover plate 10 is located above the first side portion 23, and this embodiment adopts a vertical liquid injection method from top to bottom, the inclination direction of the first side portion 23 is also the radial outward direction along the first bottom 22. The first side portion 23 is inclined upward, so the first side portion 23 is radial outward and upward from the center of the flow channel 24, thereby making the first receiving member 20 form a bowl-shaped structure with an open bottom and upward-extending sides. In this way, on the one hand, the first receiving member 20 itself has a certain receiving capacity, so that when part of the electrolyte medium acts on the upper surface of the first receiving member 20, it can be received by the first receiving member 20. At this time, the upper surface of the first side 23 can serve as a guiding surface, so that the part of the electrolyte medium can flow down along the flow channel 24 to the second receiving member 30. On the other hand, for the electrolyte medium that impacts the second receiving surface 31 and splashes upward through the flow channel 24, after splashing upward, it will impact the first receiving surface 21 and converge towards the center along the first receiving surface 21. Finally, it will converge into a droplet at the connection between the first bottom 22 and the first side 23 and fall into the second receiving member 30, thereby realizing the collection of the splashed electrolyte medium on the second receiving member 30, so that the electrolyte medium flows uniformly from the second receiving member 30 into the cell.

[0033] Optionally, the inclined extension angle of the first side 23 should be optimized according to the actual flow rate, viscosity and other characteristics of the electrolyte medium, so as to achieve the best impact force dispersion and splash liquid collection effect.

[0034] like Figure 4 and Figure 5 As shown, in this embodiment, the first side portion 23 is continuously arranged circumferentially along the first bottom portion 22 to form a complete annular structure, with the first bottom portion 22 located inside the annular structure. This ensures that after the electrolyte medium passes through the flow channel 24 of the first bottom portion 22, all splashes within a 360-degree circumferential range can be caught by the first receiving surface 21, thereby achieving a more comprehensive impact force absorption effect. The arrangement of the first bottom portion 22 inside the annular structure allows the electrolyte medium to smoothly pass through the middle flow channel 24 during injection. After the electrolyte medium splashes upon contact with the second receiving member 30, the inclined first receiving surface 21 can further catch and block the splashed electrolyte medium, thereby reducing the momentum of the splashed electrolyte medium and allowing it to slide smoothly. At the same time, it can also collect some of the electrolyte medium impacting the first receiving member 20.

[0035] Optionally, the first side portion 23 can be in the form of an arc, making the first side portion 23 as a whole a frustum shape, with the opening size of the frustum gradually decreasing from top to bottom. Alternatively, the first side portion 23 can also be in the form of multiple bends, making the first side portion 23 as a frustum shape. This embodiment adopts this configuration, and the first side portion 23 includes four sides, which are connected by arc transitions. Correspondingly, the shape of the first bottom portion 22 can match the shape of the first side portion 23. For the frustum-shaped first side portion 23, the first bottom portion 22 can be a circular plate, while for the frustum-shaped first side portion 23, the first bottom portion 22 can be a polygonal plate, such as a square plate in this embodiment.

[0036] Optionally, the dimensions of the first side 23 of the annular structure need to be designed according to the size of the first bottom 22 and the geometry of the flow channel 24 to ensure that the electrolyte medium can be diffused uniformly.

[0037] like Figure 4 and Figure 6As shown, in this embodiment, the second receiving member 30 includes a second bottom 32 and a second side portion 33. The surface of the second bottom 32 facing the injection port 11 serves as the second receiving surface 31. When the electrolyte is injected from the injection port 11, it first contacts and acts on the second receiving surface 31. This helps to disperse the impact force during the initial injection of the electrolyte medium and reduces the risk of the electrolyte directly impacting the inside of the battery cell below. The second side portion 33 is located on the periphery of the second bottom 32 and is inclined relative to the second bottom 32. The inclination direction of the second side portion 33 is the same as that of the first side portion 23, both adopting an upward inclination from bottom to top along the radial outward direction of the second bottom 32. This makes the second receiving member 30 form a bowl-shaped structure with a closed bottom and upward-extending sides. Thus, the second bottom 32 and the second side portion 33 form a receiving cavity 34, which is located on the side of the second side portion 33 facing the injection port 11, that is, above the second receiving member 30. In this way, when the electrolyte flows through the flow channel 24 and impacts the second receiving surface 31, most of the electrolyte medium will be stored in the receiving cavity. As the electrolyte medium is continuously injected, the liquid level of the stored electrolyte medium gradually rises until it is higher than the upper edge of the second side portion 33. At this point, the electrolyte medium can overflow from the edge into the cell. The impact force of the overflowing electrolyte medium itself is relatively weak, so it will not affect the separator or other parts, thus ensuring the yield rate of battery processing. The second side portion 33 and the first side portion 23 can be arranged in a roughly parallel form.

[0038] Optionally, the material of the second bottom 32 should possess sufficient strength to withstand the impact of the electrolyte. Similarly, the tilt angle of the second side 33 should be optimized based on the flow rate and viscosity of the electrolyte medium and the internal structure of the battery to ensure uniform electrolyte flow and minimize impact damage. The size and shape of the receiving cavity 34 need to be designed based on the size of the injection port 11, the injection speed, and the internal space of the battery. The receiving cavity 34 should not only ensure sufficient electrolyte storage but also ensure that the electrolyte can overflow evenly and slowly into the cell.

[0039] In addition to the bowl-shaped structure mentioned above, the first receiving member 20 and the second receiving member 30 can also be configured as a planar plate structure as needed. A through hole can be directly opened on the first receiving member 20 as a flow channel 24, or the first receiving member 20 can be configured as a bowl-shaped structure with the opening facing downwards.

[0040] like Figure 3As shown, in this embodiment, along the axial direction of the injection port 11, the depth of the receiving cavity 34 is H1, that is, the longitudinal distance between the top and bottom ends of the second side 33 is H1, and the distance between the first bottom 22 and the second bottom 32 is H2, 60% ≤ H2 / H1 ≤ 80%. This presents the second receiving member 30 as a portion of the first receiving member 20, ensuring that the receiving cavity 34 has sufficient receiving depth while ensuring that the distance between the first receiving member 20 and the second receiving member 30 is small. Thus, when the electrolyte flows into the receiving cavity 34 from the first bottom 22 through the flow channel 24, the electrolyte medium impacts the second receiving surface 31 and moves a certain distance before splashing onto the first receiving surface 21 at a low speed, and after effectively collecting on the first receiving surface 21, it flows back into the receiving cavity 34. This specific ratio ensures that the electrolyte receives appropriate buffering and dispersion as it flows from the first bottom 22 into the receiving cavity 34 through the flow channel 24. Simultaneously, it ensures that the electrolyte smoothly overflows from the receiving cavity 34 and enters the cell, avoiding excessive pressure on the cell's interior caused by the electrolyte in a short period. This reduces the possibility of diaphragm folding, thereby lowering the risk of internal short circuits. Furthermore, by controlling the electrolyte flow, it improves injection efficiency, thus reducing production costs. Simultaneously, it ensures uniform electrolyte distribution within the cell, improving the overall performance and consistency of the cell.

[0041] Optionally, the depth of the receiving cavity 34 and the distance between the first bottom 22 and the second bottom 32 need to be designed according to the injection speed and amount of electrolyte to ensure that the electrolyte can be temporarily stored while ensuring the flow path and impact force of the electrolyte medium from the first support to the second support, so as to avoid the electrolyte directly impacting the diaphragm below at high speed.

[0042] In this embodiment, the size of the flow channel 24 is larger than the size of the injection port 11. This design aims to widen the initial flow path of the electrolyte after it is injected from the injection port 11 and passes through the flow channel 24. This allows the electrolyte to flow smoothly through the flow channel and ultimately impact the second receiving surface 31, reducing the direct impact of the electrolyte on the first receiving member 20 and providing a structural basis for uniform electrolyte dispersion and further control. Similarly, the size of the second receiving surface 31 is larger than the size of the flow channel 24. Specifically, the second receiving surface 31 is located on the second receiving member 30, and its size is larger than the flow channel 24. This design ensures that when the electrolyte flows from the first receiving member 20 to the second receiving member 30, it can contact a larger surface, allowing more electrolyte to impact the second receiving surface. Simultaneously, it further disperses the impact force of the electrolyte, reducing the direct impact on the internal separator of the battery cell.

[0043] Optionally, the specific dimensions of the flow channel 24 and the second receiving surface 31 need to be optimized according to the actual size of the injection port 11, the injection speed and the characteristics of the electrolyte. As long as the flow rate of the electrolyte is controlled within a safe range, the electrolyte can be evenly distributed.

[0044] In addition to using a closed second receiving surface 31, multiple holes can also be provided on the second receiving surface 31, with the holes staggered vertically from the flow channel 24. The diameter of the holes should be smaller than the diameter of the injection port, and a buffer pad should be laid on the second receiving surface 31. Specifically, multiple holes are individually provided on the second receiving surface 31 to provide an alternative path for the flow of the electrolyte medium. In this way, the electrolyte medium can not only overflow from the upper edge of the receiving cavity 34, but also flow into the cell through the multiple holes of the second receiving surface 31. Since the diameter of the holes is smaller than the diameter of the injection port 11, the electrolyte can slowly flow into the cell through the small holes, effectively diverting the impact force of the electrolyte and avoiding direct impact on the lower diaphragm. A buffer pad is laid on the second receiving surface 31. This buffer pad can further absorb and disperse the impact force of the electrolyte, reduce the direct impact of the electrolyte on the second receiving surface 31, reduce the probability of splashing, and ensure that after the electrolyte medium fills the receiving cavity 34, it flows out slowly and evenly along the opening of the receiving cavity 34, avoiding the direct impact of the high-speed flowing electrolyte on the diaphragm, and reducing the risk of diaphragm folding and cell short circuit. Furthermore, the material of the buffer pad is usually selected to have good energy absorption characteristics and chemical stability, such as special rubber or silicone, to ensure that no chemical reaction or physical damage occurs when in contact with the electrolyte, while maintaining sufficient strength and toughness.

[0045] like Figure 3 and Figure 4 As shown, in this embodiment, along the axial direction of the injection port 11, the orthographic projection of the first receiving member 20 on the second receiving member 30 is located within the range of the second receiving member 30. The arrangement of the projection position relationship between the first receiving member 20 and the second receiving member 30 ensures that after the electrolyte enters from the injection port 11, the electrolyte medium falling on the second receiving surface 31 can directly and fully contact the first receiving surface 21 of the first receiving member 20 after splashing, and then gather on the first receiving surface 21 and flow back into the receiving cavity 34, effectively dispersing and controlling the impact force of the electrolyte.

[0046] like Figure 3 and Figure 4As shown, in this embodiment, the top cover assembly further includes multiple connecting posts 40. At least one of the following connections is provided between the first receiving member 20 and the cover plate 10, between the second receiving member 30 and the cover plate 10, and between the first receiving member 20 and the second receiving member 30: a connecting post 40 is provided and the components are connected via the connecting post 40. These connecting posts 40 are used to connect the first receiving member 20 and the second receiving member 30 to the cover plate 10, thereby forming the top cover assembly into a single integral component. This provides the top cover assembly with a certain structural strength, preventing loosening and deformation during prolonged use or in harsh environments. Furthermore, during electrolyte injection, its structural design further disperses the impact force of the electrolyte, ensuring that the electrolyte flows smoothly from the injection port 11 and, through the buffering and dispersion of the first receiving member 20 and the second receiving member 30, enters the cell evenly, avoiding direct impact on the diaphragm.

[0047] In this embodiment, connecting posts 40 are provided between the first receiving member 20 and the cover plate 10, and between the first receiving member 20 and the second receiving member 30. Specifically, there are four connecting posts 40 between the first receiving member 20 and the cover plate 10, located at the four corners of the first receiving surface 21. There are also four connecting posts 40 between the first receiving member 20 and the second receiving member 30. The part of the connecting post 40 connected to the first receiving member 20 is located at the four corners of the first receiving surface 21, and the part of the connecting post 40 connected to the second receiving member 30 is located within the fourth corner of the second receiving surface 31.

[0048] Optionally, the material of the connecting posts 40 must possess sufficient strength and stability to ensure the structural safety of the top cover assembly during assembly and use. The number and location of the connecting posts 40 are designed according to actual usage requirements to achieve optimal structural support. The connecting posts 40 can be connected to other components of the top cover assembly in various ways, such as welding, threaded connections, snap-fit ​​connections, or adhesive bonding. The specific connection method needs to be selected based on the design requirements and production conditions of the top cover assembly, as long as the stability of the connection is ensured.

[0049] Optionally, the cover plate 10 includes a top cover sheet and a lower plastic piece located on one side of the top cover sheet. In this embodiment, both the first receiving member 20 and the second receiving member 30 are disposed below the lower plastic piece, i.e., arranged from top to bottom as the top cover sheet, the lower plastic piece, the first receiving member 20, and the second receiving member 30. Furthermore, the first receiving member 20 and the second receiving member 30 can be separately disposed from the lower plastic piece, or they can be integrally formed as needed.

[0050] Specifically, when the first receiving component 20 and the second receiving component 30 are separately disposed from the lower plastic, for example, the first receiving component 20 and the second receiving component 30 can be heat-fused together to form a whole through connecting posts 40, and then the first receiving component 20 is heat-fused to the lower surface of the lower plastic through connecting posts 40. When the first receiving component 20 and the second receiving component 30 are integrally disposed from the lower plastic, that is, the first receiving component 20, the second receiving component 30, multiple connecting posts 40 and the lower plastic can be directly injection molded as a whole.

[0051] This embodiment also provides a battery, including a cell, a casing, and the aforementioned top cover assembly. The top cover assembly covers the opening of the casing to form a receiving space, within which the cell is located. By employing the aforementioned top cover assembly, this battery not only effectively controls the flow of electrolyte during the filling process, reducing direct impact on the separator and significantly lowering the risk of cell short circuits, thus improving battery safety, but also ensures uniform dispersion of the electrolyte within the cell, improving the overall performance and consistency of the battery.

[0052] It should be noted that "multiple" in the above embodiments refers to at least two.

[0053] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0054] 1. The second contact surface can withstand the impact of the electrolyte medium, preventing the electrolyte medium from acting on the separator and causing the battery to fail.

[0055] 2. It can also absorb the splashes caused by the impact of the electrolyte medium. The two aspects work together to effectively prevent the electrolyte medium itself and the splashed parts from impacting the diaphragm, thereby reducing the possibility of diaphragm folding, reducing the risk of cell short circuit, and improving the performance and consistency of the cell.

[0056] 3. After the electrolyte medium passes through the flow channel at the bottom, the splashes within a 360-degree circumferential range can be caught by the first receiving surface, thereby achieving more comprehensive impact force absorption.

[0057] 4. The first bottom is located inside the annular structure, which allows the electrolyte medium to pass smoothly through the middle flow channel during injection, reducing the momentum of the splashed electrolyte medium and allowing the electrolyte medium to slide smoothly. At the same time, it can also collect some of the electrolyte medium that impacts the first receiving part.

[0058] 5. After the electrolyte flows through the flow channel and impacts the second receiving surface, most of the electrolyte medium will be stored in the receiving cavity. As the electrolyte medium is continuously injected, the liquid level of the stored electrolyte medium gradually rises until it is higher than the upper edge of the second side. At this time, the electrolyte medium can overflow from the edge into the cell. The impact force of the overflowing electrolyte medium itself is relatively weak, so it will not affect the separator and other parts, thus ensuring the yield of battery processing.

[0059] 6. This ensures that when the electrolyte flows from the first receiving component to the second receiving component, it can come into contact with a larger surface, allowing more electrolyte to impact the second receiving surface. At the same time, it further disperses the impact force of the electrolyte and reduces the direct impact on the internal diaphragm of the battery cell.

[0060] 7. The connecting column is used to connect the first and second receiving parts to the cover plate, so that the top cover assembly forms an integral part, giving the top cover assembly a certain structural strength and preventing loosening and deformation during long-term use or in harsh environments.

[0061] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0062] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0063] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0064] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cap assembly, characterized by, include: Cover plate (10), on which a liquid injection port (11) is provided; The first receiving element (20) has a first receiving surface (21) and a flow passage (24) for the medium to pass through; The second receiving component (30) is arranged in sequence along the axial direction of the injection port (11), the first receiving component (20) and the second receiving component (30). The second receiving component (30) has a second receiving surface (31). The first receiving surface (21) is located on the surface of the first receiving component (20) facing the second receiving component (30), and the second receiving surface (31) is located on the surface of the second receiving component (30) facing the first receiving component (20). The medium injected by the injection port (11) acts on the second receiving surface (31) through the flow channel (24) and splashes onto the first receiving surface (21).

2. The roof assembly of claim 1, wherein, The first receiving component (20) includes: A first bottom (22) having a through-flow channel (24); The first side portion (23) is located on the periphery of the first bottom portion (22), and the first side portion (23) is inclined relative to the surface of the first bottom portion (22). The surface of the first side portion (23) away from the injection port (11) serves as the first receiving surface (21).

3. The roof assembly of claim 2, wherein, Along a direction away from the first bottom (22), the first side (23) is inclined toward the cover plate (10).

4. The roof assembly of claim 2, wherein, The first side portion (23) is continuously arranged along the circumference of the first bottom portion (22) to form an annular structure, and the first bottom portion (22) is located inside the annular structure.

5. The top cover assembly according to claim 1, characterized in that, The second receiving component (30) includes: The second bottom (32) has a surface facing the injection port (11) as the second receiving surface (31). The second side portion (33) is located on the periphery of the second bottom portion (32) and is inclined relative to the second bottom portion (32). The second bottom portion (32) and the second side portion (33) form a receiving cavity (34), which is located on the side of the second side portion (33) facing the injection port (11).

6. The top cover assembly according to claim 5, characterized in that, Along the axial direction of the injection port (11), the depth of the receiving cavity (34) is H1, the first receiving member (20) includes a first bottom (22) having the flow channel (24), the distance between the first bottom (22) and the second bottom (32) is H2, 60% ≤ H2 / H1 ≤ 80%; and / or Along a direction away from the second bottom (32), the second side (33) is inclined toward the cover plate (10).

7. The top cover assembly according to claim 1, characterized in that, The size of the flow channel (24) is larger than the size of the injection port (11), and the size of the second receiving surface (31) is larger than the size of the flow channel (24); and / or Along the axial direction of the injection port (11), the orthographic projection of the first receiving member (20) on the second receiving member (30) is located within the range of the second receiving member (30), and / or the orthographic projection of the flow channel (24) on the second receiving member (30) is located within the second receiving surface (31).

8. The roof assembly of claim 1, wherein, The top cover assembly also includes a plurality of connecting posts (40), and at least one of the following locations is provided with the connecting post (40) between the first receiving member (20) and the cover plate (10), between the second receiving member (30) and the cover plate (10), and between the first receiving member (20) and the second receiving member (30), and is connected by the connecting post (40).

9. The roof assembly of claim 1, wherein, The cover plate (10) includes a top cover sheet and a lower plastic sheet located on one side of the top cover sheet, and both the first receiving member (20) and the second receiving member (30) are disposed below the lower plastic sheet.

10. A battery, characterized by The device includes a battery cell, a housing, and a top cover assembly according to any one of claims 1 to 9, the top cover assembly covering an opening in the housing to form a receiving space, the battery cell being located within the receiving space.

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