Battery liquid injection hole sealing structure and battery pack

Abstract

The utility model provides a kind of battery liquid injection hole sealing structure and battery package.The battery liquid injection hole sealing structure includes: sealing component, including sealing glue nail and sealing cover piece;Top cover component, top cover component is equipped with liquid injection hole, liquid injection hole includes the sealing hole section and fixed hole section along the thickness direction of top cover component, sealing glue nail is sealed with sealing hole section Cooperation, sealing cover piece is connected with fixed hole section, sealing hole section and fixed hole section are directly communicated, fixed hole section is tapered hole, away from sealing hole section along the thickness direction, the inner diameter of tapered hole gradually increases.The utility model technical scheme solves the problem that the battery liquid injection hole sealing structure in prior art requires higher mold and leads to higher processing cost.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery filling hole sealing structure and a battery pack. Background Technology

[0002] In existing technology, secondary batteries generally have an injection hole on the top cover. This injection hole is typically divided into three sections: a ramp section 1 that mates with the aluminum sealing nail 4; a straight section 2 that mates with the sealing nail 5 and extends in the thickness direction; and a connecting section 3 that connects the ramp section 1 and the straight section 2. (See...) Figure 1 As shown; after the battery cell is filled with electrolyte, the sealing nail 5 is inserted, forming an interference fit seal with the straight section 2 to prevent electrolyte overflow and contamination of the ramp section 1, which could lead to welding abnormalities such as soldering spatters. See Figure 2 As shown; then assemble the aluminum sealing nails 4 to the corresponding positions of the ramp section 1, and weld the top cover plate and aluminum sealing nails 4 to achieve a seal, see Figure 3 As shown; however, the above-mentioned injection hole structure is a complex three-section structure, which places high demands on the mold and leads to high processing costs. Utility Model Content

[0003] The main objective of this invention is to provide a battery injection hole sealing structure and a battery pack to solve the problem that the existing battery injection hole sealing structure has high requirements for molds, resulting in high processing costs.

[0004] To achieve the above objectives, this utility model provides a battery filling hole sealing structure, comprising: a sealing component including a sealing nail and a sealing cover; a top cover component having a filling hole, the filling hole including a sealing hole section and a fixing hole section arranged along the thickness direction of the top cover component, the sealing nail sealingly engaging with the sealing hole section, the sealing cover being connected to the fixing hole section, the sealing hole section and the fixing hole section being directly connected, the fixing hole section being a tapered hole that moves away from the sealing hole section along the thickness direction, and the inner diameter of the tapered hole gradually increasing.

[0005] Furthermore, the fixed hole section has an inclined inner wall, and there is an angle A between the inclined inner wall and the axis of the injection hole. The angle A satisfies: 35°<A≤45°, and the sealing hole section is a straight hole.

[0006] Furthermore, along the thickness direction, the outer diameter of the end of the sealing cap furthest from the sealing nail is greater than the outer diameter of the end of the sealing cap closest to the sealing nail.

[0007] Furthermore, the sealing nail includes a mating body and an auxiliary assembly connected to the mating body. The mating body is sealed to the sealing hole section. The auxiliary assembly is located on the side of the mating body facing the sealing cover. The sealing nail has a projection plane perpendicular to the thickness direction. The projected area of ​​the auxiliary assembly on the upper surface of the top cover member is smaller than the projected area of ​​the mating body on the upper surface of the top cover member.

[0008] Furthermore, the sealing cover has a recess on the side facing the sealing nail, and the auxiliary assembly is matched with the recess to position the sealing cover.

[0009] Furthermore, the mating body comprises an upper limit segment, a mating segment, and a lower limit segment connected sequentially along the thickness direction. The auxiliary assembly is connected to the upper limit segment, the mating segment is sealed to the sealing hole segment, and the lower limit segment extends out of the injection hole in a direction away from the auxiliary assembly. The projected area of ​​the auxiliary assembly along the thickness direction is S1, the projected area of ​​the upper limit segment along the thickness direction is S2, the projected area of ​​the mating segment along the thickness direction is S3, and the projected area of ​​the lower limit segment along the thickness direction is S4, wherein S1≤S3≤S4≤S2.

[0010] Furthermore, the mating section is cylindrical, with an outer diameter D1 and an inner diameter D2 for the sealing hole section, wherein D1 ≤ 1.2 × D2.

[0011] Furthermore, the upper limit segment has an inclined outer wall, and the cross-sectional area of ​​the upper limit segment gradually increases from the mating segment to the auxiliary assembly; and / or, the lower limit segment has an arc-shaped outer wall, and the cross-sectional area of ​​the lower limit segment gradually increases along the thickness direction from both ends of the lower limit segment to the center of the lower limit segment.

[0012] Furthermore, the sealing cap is provided with an annular groove located on the side of the sealing cap opposite to the injection hole; and / or, the end of the sealing cap away from the sealing nail is welded to the fixing hole section.

[0013] According to another aspect of the present invention, the present invention provides a battery pack, including a battery housing, the aforementioned battery filling hole sealing structure, and a battery module, wherein the battery module is located inside the battery housing, and a top cover component covers the battery housing.

[0014] The present invention provides a liquid injection hole comprising a sealing section and a fixing section. The sealing cap is connected to the fixing section, and the sealing nail is sealed to the sealing section, thereby sealing the liquid injection hole and effectively preventing electrolyte leakage or external impurities from entering the battery, ensuring the battery's safety and reliability. Compared to the complex three-section design in the prior art, the present invention simplifies the liquid injection hole to two parts: a sealing section and a fixing section. This reduces the requirements for molds during manufacturing, thereby reducing processing costs and facilitating processing. 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 A schematic diagram of a prior art battery fluid injection port is shown;

[0017] Figure 2 It shows Figure 1 A schematic diagram of the assembly structure of the battery filling hole and sealing nail;

[0018] Figure 3 It shows Figure 1 A schematic diagram of the assembly structure of the battery filling hole, sealing nails, and aluminum sealing nails;

[0019] Figure 4 A schematic diagram of an embodiment of the battery filling hole sealing structure of this utility model is shown;

[0020] Figure 5 It shows Figure 4 A cross-sectional view at the CC section of the battery filling hole sealing structure;

[0021] Figure 6 It shows Figure 5 A partially enlarged view of the battery filling hole sealing structure;

[0022] Figure 7 It shows Figure 5 Another enlarged view of the battery filling hole sealing structure;

[0023] Figure 8 It shows Figure 5 A magnified view of a portion of the battery's electrolyte filling hole;

[0024] Figure 9 It shows Figure 5 A schematic diagram of the sealing nail structure of the battery filling hole sealing structure;

[0025] Figure 10 It shows Figure 5 A schematic diagram of the sealing cover of the battery filling hole sealing structure;

[0026] Figure 11 It shows Figure 10 A cross-sectional view of the BB section of the battery filling hole sealing structure.

[0027] The above figures include the following reference numerals:

[0028] 10. Sealing nail; 11. Fitting body; 111. Upper limit section; 112. Fitting section; 113. Lower limit section; 12. Auxiliary assembly; 20. Top cover component; 21. Sealing hole section; 22. Fixing hole section; 221. Inclined inner wall; 30. Sealing cover; 31. Recessed part; 32. Annular groove. Detailed Implementation

[0029] 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.

[0030] like Figures 4 to 11 As shown, an embodiment of this utility model provides a battery filling hole sealing structure, including: a sealing component, including a sealing nail 10 and a sealing cover 30; a top cover component 20, the top cover component 20 having a filling hole, the filling hole including a sealing hole section 21 and a fixing hole section 22 arranged along the thickness direction Z of the top cover component 20, the sealing nail 10 sealingly engaging with the sealing hole section 21, the sealing cover 30 being connected to the fixing hole section 22, the sealing hole section 21 and the fixing hole section 22 being directly connected, the fixing hole section 22 being a tapered hole, moving away from the sealing hole section 21 along the thickness direction Z, the inner diameter of the tapered hole gradually increasing.

[0031] In the above technical solution, the injection hole includes a sealing hole section 21 and a fixing hole section 22. The sealing cover 30 is connected to the fixing hole section 22, and the sealing nail 10 is sealed to the sealing hole section 21, which can seal the injection hole and effectively prevent electrolyte leakage or external impurities from entering the battery, thus ensuring the safety and reliability of the battery. Compared with the complex three-section setting in the prior art, this utility model simplifies the injection hole to two parts, the sealing hole section 21 and the fixing hole section 22, which can reduce the requirements of the mold in the manufacturing process, thereby reducing processing costs and facilitating processing.

[0032] Furthermore, the above-mentioned setup can improve the assembly efficiency of the sealing nail 10 and the sealing cover 30, simplify the structure of the injection hole, and improve the welding efficiency.

[0033] In some embodiments, the sealing cap 30 is an aluminum sealing stud.

[0034] In some embodiments, such as Figure 8 As shown, the thickness of the top cover component 20 is increased at the location where the injection hole is provided, that is, the sealing hole section 21 extends beyond other locations of the top cover component 20 with smaller thickness, thereby increasing the depth of the injection hole.

[0035] It should be noted that the projection of the fixed hole section 22 along the thickness direction Z is always greater than the projection of the sealing hole section 21 along the thickness direction Z.

[0036] It should be noted that the top cover component 20 has two perpendicularly arranged length direction, width direction and thickness direction Z.

[0037] like Figures 4 to 11 As shown in the embodiment of this utility model, the fixing hole section 22 has an inclined inner wall 221 that is inclined, and there is an angle A between the inclined inner wall 221 and the axis of the injection hole. The angle A satisfies: 35°<A≤45°, and the sealing hole section 21 is a straight hole.

[0038] In the above technical solution, when the included angle A exceeds 45°, the excessive tilt angle of the fixing hole section 22 will complicate the processing. That is, in the subsequent welding process, if the tilted inner wall 221 is too tilted, it will increase the difficulty of the welding operation and affect the welding effect and the stability of the structure. Conversely, if the included angle A is less than 35°, the diameter of the sealing cover 30 may be excessively reduced, thereby affecting the machining accuracy of the part and the dimensional stability of the overall structure, leading to processing complexity. At the same time, keeping the sealing hole section 21 as a straight hole is beneficial for the smooth assembly of the sealing nail 10 and better sealing.

[0039] like Figures 4 to 11 As shown in the embodiment of this utility model, along the thickness direction Z, the outer diameter of the end of the sealing cover 30 away from the sealing nail 10 is greater than the outer diameter of the end of the sealing cover 30 near the sealing nail 10.

[0040] The above configuration creates a natural sealing effect during assembly, with a wider contact surface at the top and a narrower contact surface at the end facing the sealing nail 10. This not only facilitates assembly but also effectively enhances sealing performance and reduces the risk of potential leakage. Furthermore, this structure optimizes the welding process to some extent, ensuring the tightness of the welded area and improving the overall quality and efficiency of the manufacturing process.

[0041] In some embodiments, the aluminum sealing nail is circular in shape.

[0042] like Figures 4 to 11 As shown in the embodiment of this utility model, the sealing nail 10 includes a mating body 11 and an auxiliary assembly 12 connected to the mating body 11. The mating body 11 is sealed to the sealing hole section 21. The auxiliary assembly 12 is located on the side of the mating body 11 facing the sealing cover 30. The sealing nail 10 has a projection plane perpendicular to the thickness direction Z. The projection area of ​​the auxiliary assembly 12 on the upper surface of the top cover member 20 is smaller than the projection area of ​​the mating body 11 on the upper surface of the top cover member 20.

[0043] In the above technical solution, the sealing nail 10 is composed of a mating body 11 and an auxiliary assembly 12. The mating body 11 fits tightly with the sealing hole section 21 to achieve a sealing effect, while the auxiliary assembly 12 is located on the side of the mating body 11 facing the sealing cover 30. On the projection plane of the top cover component, the projection area of ​​the auxiliary assembly 12 on the upper surface of the top cover component is smaller than the projection area of ​​the mating body 11. In this way, not only can the sealing nail 10 be assembled by clamping the auxiliary assembly 12, thereby reducing the assembly difficulty, but it can also ensure that the auxiliary assembly 12 does not occupy excessive space during the assembly process, thereby avoiding interference with the sealing cover 30 or other components.

[0044] like Figures 4 to 11 As shown in the embodiment of this utility model, the sealing cover 30 has a recessed portion 31 on the side facing the sealing nail 10, and the auxiliary assembly 12 is limited to the recessed portion 31 to position the sealing cover 30.

[0045] In the above technical solution, the sealing cover 30 has a recessed portion 31 on the side facing the sealing nail 10, which forms a limiting fit with the auxiliary assembly 12, thereby achieving the positioning of the sealing cover 30. In this way, on the one hand, after the sealing nail 10 is assembled, it can help the aluminum sealing nail to be placed more flat when assembling the aluminum sealing nail, avoiding the problem of poor welding caused by the aluminum sealing nail being warped; on the other hand, the addition of the auxiliary assembly 12 can make it easier to clamp the sealing nail 10 and prevent the wrong direction from being installed; furthermore, it can ensure the stability and accuracy of the sealing cover 30 during the assembly process, avoiding poor sealing or assembly difficulties caused by positional deviation.

[0046] like Figures 4 to 11 As shown, in an embodiment of this utility model, the mating body 11 comprises an upper limit segment 111, a mating segment 112, and a lower limit segment 113 connected sequentially along the thickness direction Z. The auxiliary assembly 12 is connected to the upper limit segment 111, the mating segment 112 is sealed and mated with the sealing hole segment 21, and the lower limit segment 113 extends out of the injection hole in a direction away from the auxiliary assembly 12. The projected area of ​​the auxiliary assembly 12 along the thickness direction Z is S1, the projected area of ​​the upper limit segment 111 along the thickness direction Z is S2, the projected area of ​​the mating segment 112 along the thickness direction Z is S3, and the projected area of ​​the lower limit segment 113 along the thickness direction Z is S4, wherein S1≤S3≤S4≤S2.

[0047] With the above configuration, the sealing nail has a four-segment structure, consisting of an auxiliary assembly 12, an upper limit segment 111, a mating segment 112, and a lower limit segment 113 from top to bottom. The projected area S1 of the auxiliary assembly 12 should not be set too large, so as to avoid interference with the sealing cover 30. The auxiliary assembly 12 has a small diameter, which makes it easy to identify from the outside that the auxiliary assembly 12 is facing upwards, so as to facilitate clamping. At the same time, S3≤S4≤S2, so as to prevent the sealing nail 10 from falling out of the injection hole, thereby achieving stable sealing.

[0048] It should be noted that the projection along the thickness direction Z is set perpendicular to the thickness direction Z.

[0049] It should be noted that the projected area S1 is equal to the maximum cross-sectional area of ​​the auxiliary assembly 12, the projected area S2 is equal to the maximum cross-sectional area of ​​the upper limit segment 111, the projected area S3 is equal to the maximum cross-sectional area of ​​the mating segment 112, and the projected area S4 is equal to the maximum cross-sectional area of ​​the lower limit segment 113.

[0050] like Figures 4 to 11 As shown in the embodiment of this utility model, the mating section 112 is cylindrical, with an outer diameter D1, and the sealing hole section 21 has an inner diameter D2, wherein D1 ≤ 1.2 × D2. This allows for an interference fit, thereby ensuring the stability of the assembly.

[0051] In some embodiments, the sealant nail 10 is a rotating body.

[0052] In some embodiments, S3 is the projected area of ​​the mating segment 112, and its cross-sectional area or maximum outer diameter at different positions in the thickness direction Z should be consistent.

[0053] like Figures 4 to 11 As shown in the embodiments of this utility model, the upper limit segment 111 has an inclined outer wall, and the cross-sectional area of ​​the upper limit segment 111 gradually increases from the mating segment 112 to the auxiliary assembly 12; and / or, the lower limit segment 113 has an arc-shaped outer wall, and along the thickness direction Z, the cross-sectional area of ​​the lower limit segment 113 gradually increases from both ends of the lower limit segment 113 to the center of the lower limit segment 113.

[0054] In the above technical solution, the lower limit segment 113 is provided with an arc-shaped outer wall. The outer diameters at both ends of the lower limit segment 113 are smaller than those in the middle, so that the mating body 11 can form a structure that is thinner in the middle and thicker at both ends. This ensures the reliability of the sealing nail 10 assembly, prevents excessive assembly, and prevents the sealing nail 10 from coming out upwards due to high pressure such as gas generation inside the battery cell, which could lead to electrolyte reaching the weld seam of the aluminum sealing nail and corroding the weld. It also facilitates the lower limit segment 113 to extend from the sealing hole segment 21 to achieve the limiting effect, and allows technicians to easily remove the lower limit segment 113 from below the sealing hole segment 21, thereby facilitating the assembly and disassembly of the sealing nail 10. At the same time, the inclined outer wall of the upper limit segment 111 can adapt to the shape and slope of the fixing hole segment 22 of the injection hole for easy assembly.

[0055] Because existing aluminum sealing nails are solid near the edges, stress cracks and pinholes can easily form during the cooling process of the weld pool, leading to leaks. Therefore, if... Figures 4 to 11 As shown in the embodiment of this utility model, the sealing cover 30 is provided with an annular groove 32, which is located on the side of the sealing cover 30 away from the injection hole; and / or, the end of the sealing cover 30 away from the sealing nail 10 is welded to the fixing hole section 22.

[0056] In the above technical solution, by setting the annular groove 32, it is helpful to balance the stress distribution during the welding process, reduce the generation of cracks and pinholes, and thus enhance the sealing performance. In addition, the end of the sealing cover 30 is welded to the fixing hole section 22, which can ensure a stable connection between the sealing cover 30 and the top cover component 20, so as to improve the sealing performance and reliability of the overall structure.

[0057] It should be noted that in this application, the injection hole is set to two sections, including a sealing hole section 21 and a fixing hole section 22, which are used in conjunction with aluminum sealing nails with annular grooves 32 on the edge. In addition, the four-section sealing nails 10 are used together, which can not only improve the assembly efficiency of the sealing nails 10 and aluminum sealing nails, but also simplify the injection hole structure on the top cover component 20 and improve the welding efficiency.

[0058] In some embodiments, the aluminum sealing pin has an annular groove 32 on the side opposite to the injection hole near the edge.

[0059] In some embodiments, when the upper surface of the aluminum sealing nail is flush with the top cover member 20, the upper surface of the upper limit segment 111 of the sealing nail 10 should be lower than the lower surface of the aluminum sealing nail to prevent the sealing nail 10 from affecting the assembly of the aluminum sealing nail.

[0060] In some embodiments, the height of the auxiliary assembly 12 is such that after the sealing nail 10 is assembled, the top end of the auxiliary assembly 12 is just close to or level with the lower surface of the recess 31 of the aluminum sealing nail. The diameter of the auxiliary assembly 12 is 0.7-1 times the diameter of the lower surface of the recess 31 of the aluminum sealing nail. With the above configuration, on the one hand, after the sealing nail 10 is assembled, it can help to better flatten the aluminum sealing nail during assembly, avoiding the problem of poor welding caused by the aluminum sealing nail tilting; on the other hand, adding the auxiliary assembly 12 can make it easier to clamp the sealing nail 10 and prevent mistaken installation in the wrong direction.

[0061] An embodiment of this utility model provides a battery pack, including a battery housing, the aforementioned battery filling hole sealing structure, and a battery module. The battery module is located inside the battery housing, and a top cover component 20 covers the battery housing.

[0062] The battery pack described above has all the advantages of the battery filling hole sealing structure described above, which will not be repeated here.

[0063] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects: the injection hole includes a sealing hole section and a fixing hole section, the sealing cover is connected to the fixing hole section, and the sealing nail is sealed to the sealing hole section, which can seal the injection hole, effectively preventing electrolyte leakage or external impurities from entering the battery, and ensuring the safety and reliability of the battery; compared with the complex three-section setting in the prior art, this utility model simplifies the injection hole into two parts, a sealing hole section and a fixing hole section, which can reduce the requirements of the mold in the manufacturing process, thereby reducing processing costs and facilitating processing.

[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 battery electrolyte filling hole sealing structure, characterized in that, include: The sealing components include sealing nails (10) and sealing caps (30). The top cover component (20) is provided with a liquid injection hole, which includes a sealing hole section (21) and a fixing hole section (22) arranged along the thickness direction (Z) of the top cover component (20). The sealing nail (10) is sealed to the sealing hole section (21), and the sealing cover (30) is connected to the fixing hole section (22). The sealing hole section (21) and the fixing hole section (22) are directly connected. The fixing hole section (22) is a tapered hole that moves away from the sealing hole section (21) along the thickness direction (Z). The inner diameter of the tapered hole gradually increases.

2. The battery filling hole sealing structure according to claim 1, characterized in that, The fixed hole section (22) has an inclined inner wall (221) with an angle A between the inclined inner wall (221) and the axis of the injection hole. The angle A satisfies: 35°<A≤45°. The sealing hole section (21) is a straight hole.

3. The battery filling hole sealing structure according to claim 1, characterized in that, Along the thickness direction (Z), the outer diameter of the end of the sealing cap (30) away from the sealing nail (10) is greater than the outer diameter of the end of the sealing cap (30) near the sealing nail (10).

4. The battery filling hole sealing structure according to claim 1, characterized in that, The sealing nail (10) includes a mating body (11) and an auxiliary assembly (12) connected to the mating body (11). The mating body (11) is sealed to the sealing hole section (21). The auxiliary assembly (12) is located on the side of the mating body (11) facing the sealing cover (30). The sealing nail (10) has a projection plane perpendicular to the thickness direction (Z). The projection area of ​​the auxiliary assembly (12) on the upper surface of the top cover member (20) is smaller than the projection area of ​​the mating body (11) on the upper surface of the top cover member (20).

5. The battery filling hole sealing structure according to claim 4, characterized in that, The sealing cover (30) has a recess (31) on the side facing the sealing nail (10), and the auxiliary assembly (12) is matched with the recess (31) to position the sealing cover (30).

6. The battery filling hole sealing structure according to claim 4, characterized in that, The mating body (11) comprises an upper limit segment (111), a mating segment (112), and a lower limit segment (113) connected sequentially along the thickness direction (Z). The auxiliary assembly (12) is connected to the upper limit segment (111), the mating segment (112) is sealed to the sealing hole segment (21), and the lower limit segment (113) extends out of the injection hole in a direction away from the auxiliary assembly (12). The projected area of ​​the auxiliary assembly (12) along the thickness direction (Z) is S1, the projected area of ​​the upper limit segment (111) along the thickness direction (Z) is S2, the projected area of ​​the mating segment (112) along the thickness direction (Z) is S3, and the projected area of ​​the lower limit segment (113) along the thickness direction (Z) is S4, wherein S1≤S3≤S4≤S2.

7. The battery filling hole sealing structure according to claim 6, characterized in that, The mating section (112) is cylindrical, the mating section (112) has an outer diameter D1, and the sealing hole section (21) has an inner diameter D2, wherein D1≤1.2×D2.

8. The battery filling hole sealing structure according to claim 6, characterized in that, The upper limit segment (111) has an inclined outer wall, and the cross-sectional area of ​​the upper limit segment (111) gradually increases from the mating segment (112) to the auxiliary assembly (12); and / or, the lower limit segment (113) has an arc-shaped outer wall, and the cross-sectional area of ​​the lower limit segment (113) gradually increases from both ends of the lower limit segment (113) to the center of the lower limit segment (113) along the thickness direction (Z).

9. The battery filling hole sealing structure according to any one of claims 1 to 8, characterized in that, The sealing cap (30) is provided with an annular groove (32), the annular groove (32) being located on the side of the sealing cap (30) opposite to the injection hole; and / or, the end of the sealing cap (30) away from the sealing nail (10) is welded to the fixing hole section (22).

10. A battery pack, characterized in that, The battery includes a battery housing, a battery filling hole sealing structure according to any one of claims 1 to 9, and a battery module, wherein the battery module is located inside the battery housing and the top cover member (20) covers the battery housing.

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