Battery liquid injection hole structure and cover plate assembly

Abstract

The utility model relates to battery technical field discloses a kind of battery liquid injection hole structure and cover plate assembly.The battery liquid injection hole structure is arranged on positive pole post, including liquid injection hole and annular baffle, liquid injection hole penetrates positive pole post, annular baffle is arranged around the entrance of liquid injection hole on the upper end surface of positive pole post, and annular baffle surrounds the entrance of liquid injection hole, the outlet of liquid injection hole is flush with the bottom end surface of positive pole post.Due to the liquid injection hole being arranged on positive pole post, when the liquid injection hole structure is encapsulated on cylindrical battery cover plate assembly, liquid injection hole will be with the battery cell of cylindrical battery on the same axial line, therefore, in the process that liquid injection hole fills electrolyte, electrolyte will be immersed from the axial position of battery cell and can quickly, uniformly immerse to the periphery of battery cell, so that the electrolyte immersed by entire battery cell is more accurate, uniform, further improve the performance of cylindrical battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery filling hole structure and cover plate assembly. Background Technology

[0002] A secondary battery, also known as a rechargeable battery or storage battery, is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. Common secondary batteries include lead-acid batteries and lithium-ion batteries. In a secondary battery, the electrolyte conducts electrons between the positive and negative terminals, forming a circuit that generates current. A secondary battery generally consists of a battery cell, a battery casing housing the cell, a battery cover assembly sealed to the casing, and electrolyte filled into the casing. To facilitate the injection of electrolyte into the battery casing, an injection hole is usually provided on the battery cover. After the electrolyte is injected through this hole, a sealing pin is welded to the inlet of the injection hole for sealing.

[0003] In existing technologies, the positive terminal of a cylindrical battery is set at the center of the cover plate, while the electrolyte injection hole is set off from the center of the cover plate. When the electrolyte is poured in through the injection hole, the electrolyte will also be off the center point of the cell. Therefore, during the process of filling the electrolyte, the entire cell cannot be quickly and evenly filled with electrolyte, resulting in a large error in electrolyte filling and affecting the battery performance.

[0004] Therefore, there is an urgent need for a battery filling hole structure and cover plate assembly to solve the above problems. Utility Model Content

[0005] Based on the above, the purpose of this utility model is to provide a battery injection hole structure and cover plate assembly to solve the problem that the traditional injection hole misalignment structure leads to a large error in electrolyte filling, which affects the battery performance.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model provides a battery electrolyte filling hole structure, which is disposed on the positive electrode post. The battery electrolyte filling hole structure includes an electrolyte filling hole and an annular baffle. The electrolyte filling hole penetrates through the positive electrode post. The annular baffle is disposed around the inlet of the electrolyte filling hole on the upper end face of the positive electrode post and surrounds the inlet of the electrolyte filling hole. The outlet of the electrolyte filling hole is flush with the bottom end face of the positive electrode post.

[0008] As an optional technical solution for battery electrolyte filling hole structure, the annular baffle and the positive electrode post are integrally formed, and the outer diameter of the annular baffle is larger than the outer diameter of the positive electrode post.

[0009] As an optional technical solution for battery injection hole structure, the inner wall of the annular baffle is a tapered structure that is wider at the top and narrower at the bottom.

[0010] As an optional technical solution for battery injection hole structure, the injection hole consists of two parts, wherein the inner wall of the annular baffle is the upper half of the injection hole, and the lower half of the injection hole is a circular hole structure of equal diameter.

[0011] As an optional technical solution for the battery injection hole structure, the diameter of the lower half of the injection hole is smaller than the diameter of the lowest end of the inner wall of the annular baffle.

[0012] On the other hand, the present invention provides a cover plate assembly, including the battery injection hole structure described above, and also includes an end cap for installing the positive electrode post and an insulating plate disposed at the bottom of the end cap, wherein the positive electrode post is installed between the end cap and the insulating plate, and the annular retaining edge extends to the top of the end cap.

[0013] As an optional technical solution for the cover plate assembly, the outer diameter of the positive electrode post is provided with an annular abutment portion integrally formed therewith, and an annular groove is formed between the annular abutment portion and the annular retaining edge.

[0014] As an optional technical solution for the cover plate assembly, the end cap has a clearance hole at its center, the annular retaining edge passes through the clearance hole and extends to the top of the end cap; the annular abutment part and the bottom of the end cap are sealed and fixedly connected by an insulating sealant layer; a UV-curable adhesive is provided between the annular groove and the inner wall of the clearance hole.

[0015] As an optional technical solution for the cover plate assembly, the insulating sheet has a mounting hole at its center; the bottom edge of the positive electrode post has a chamfered structure, and an annular snap-fit ​​groove is provided between the annular abutment part and the bottom end of the positive electrode post, with the mounting hole passing through the bottom end of the positive electrode post; the insulating sheet is snapped into the annular snap-fit ​​groove.

[0016] As an optional technical solution for the cover plate assembly, a sealing pin is provided at the inlet of the injection hole, the sealing pin is sealed to the inner wall of the annular baffle, and the upper end face of the sealing pin is flush with the upper end face of the annular baffle; the circumference of the end cap is provided with an annular step for encapsulating the battery casing.

[0017] The beneficial effects of this utility model are as follows:

[0018] This invention discloses a battery electrolyte injection hole structure. The structure is disposed on the positive electrode post and includes an injection hole and an annular baffle. The injection hole penetrates the positive electrode post, and the annular baffle is positioned around the inlet of the injection hole on the upper surface of the positive electrode post, surrounding the inlet. The outlet of the injection hole is flush with the bottom surface of the positive electrode post. Because the injection hole penetrates the positive electrode post, when this structure is encapsulated on a cylindrical battery cover assembly, the injection hole will be aligned with the cell of the cylindrical battery. Therefore, during the process of filling the injection hole with electrolyte, the electrolyte will begin to penetrate from the center of the cell and can quickly and evenly penetrate to the periphery of the cell. This results in more precise and uniform electrolyte penetration throughout the cell, further improving the performance of the cylindrical battery. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the positive electrode post in Embodiment 1 of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of the cover plate assembly in Embodiment 2 of this utility model;

[0021] Figure 3 This is a cross-sectional schematic diagram of the cover plate assembly in Embodiment 2 of this utility model;

[0022] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 This is an exploded view of the cover plate assembly in Embodiment 2 of this utility model;

[0024] Figure 6 This is a schematic diagram of the end cap structure in Embodiment 2 of this utility model.

[0025] In the picture:

[0026] 1. Positive electrode post; 10. Injection hole; 11. Annular flange; 12. Annular abutment part; 13. Annular groove; 14. Annular snap-fit ​​groove; 15. Sealing pin;

[0027] 2. End cap; 20. Clearance hole; 21. Insulating sealant layer; 22. UV-cured adhesive; 23. Explosion-proof valve; 24. Protective plate; 25. Annular step; 26. Annular clearance position; 27. Positioning hole;

[0028] 3. Isolation plate; 30. Mounting hole; 31. Positioning post. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0034] Example 1

[0035] refer to Figure 1This utility model discloses a battery injection hole 10 structure. The battery injection hole 10 structure is disposed on the positive electrode post 1 and includes an injection hole 10 and an annular baffle 11. The injection hole 10 penetrates the positive electrode post 1. The annular baffle 11 is disposed around the inlet of the injection hole 10 on the upper end face of the positive electrode post 1 and surrounds the inlet of the injection hole 10. The outlet of the injection hole 10 is flush with the bottom end face of the positive electrode post 1.

[0036] In this embodiment, the battery electrolyte injection hole 10 structure is designed to penetrate the positive electrode post 1. When the electrolyte injection hole 10 structure is encapsulated on the cylindrical battery cover assembly, the electrolyte injection hole 10 will be located on the same axis as the cylindrical battery cell. Therefore, during the process of filling the electrolyte into the electrolyte injection hole 10, the electrolyte will start to penetrate from the axis of the cell and can quickly and evenly penetrate to the periphery of the cell, making the electrolyte immersed in the entire cell more precise and uniform, and further improving the performance of the cylindrical battery.

[0037] For details, please refer to the following: Figure 1 The annular baffle 11 and the top of the positive electrode post 1 are integrally formed. This structure not only strengthens the connection between the annular baffle 11 and the positive electrode post 1, but also reduces the resistance between them, allowing for a larger current flow and improving the reliability and stability of the electrical connection between the positive electrode post 1 and the external terminal product. In this structure, the annular baffle 11 divides the injection hole 10 into two parts: an upper part and a lower part. The upper part is an inner wall hole of the annular baffle 11, and the lower part is a circular hole of equal diameter penetrating the positive electrode post 1. The annular baffle 11 creates an extension at the inlet of the injection hole 10. During electrolyte injection, the annular baffle 11 prevents splashing, making it less likely for the electrolyte to spill out. On the other hand, by setting the annular retaining edge 11, it is also convenient to install the sealing nail 15. Because of the annular retaining edge 11, the contact area between the sealing nail 15 and the inlet of the injection hole 10 is large, so the welding effect is good, which solves the problem of incomplete welding and leakage welding that is easy to occur when welding the sealing nail 15 in the prior art.

[0038] Furthermore, the diameter of the lower half of the injection hole 10 is smaller than the diameter of the lowest end of the inner wall of the annular baffle 11, and the inner wall of the annular baffle 11 has a tapered structure that is wider at the top and narrower at the bottom, which makes it easier for the electrolyte to flow down from the inlet of the injection hole 10 and prevents electrolyte residue from remaining at the inlet of the injection hole 10.

[0039] Example 2

[0040] refer to Figures 2 to 6This embodiment provides a cover plate assembly, which includes the battery injection hole 10 structure in the above embodiment, an end cap 2 for installing the positive electrode post 1, and an isolation plate 3 disposed at the bottom of the end cap 2. The positive electrode post 1 is installed between the end cap 2 and the isolation plate 3, and the annular baffle 11 extends to the top of the end cap 2.

[0041] For details, please refer to Figure 2 and Figure 6 The end cap 2 has a clearance hole 20 at its center. The annular baffle 11 passes through the clearance hole 20 and extends to the top of the end cap 2. A sealing pin 15 is provided at the entrance of the injection hole 10. The sealing pin 15 is sealed to the inner wall of the annular baffle 11. Specifically, the sealing pin 15 is made of a metal material with good conductivity. In this embodiment, the sealing pin 15 is made of aluminum. The sealing pin 15 is welded to the entrance of the injection hole 10 by laser welding, which improves the sealing performance of the injection hole 10. The upper end face of the sealing pin 15 is flush with the upper end face of the annular baffle 11, so that the external terminal product can be connected to the end face of the sealing pin 15 to make an effective electrical connection through the positive terminal post 1. On the other hand, the end cap 2 has an annular step 25 for encapsulating the battery casing on its circumference, so that the cover plate assembly can be encapsulated through the annular step 25 on the end cap 2 and the battery casing.

[0042] Further reference Figures 3 to 5 The outer diameter of the positive electrode post 1 is provided with an annular abutment portion 12 integrally formed therewith, and an annular groove 13 is formed between the annular abutment portion 12 and the annular retaining edge 11. The annular abutment portion 12 and the bottom of the end cap 2 are sealed and fixedly connected by an insulating sealant layer 21 (see reference). Figure 6 The end cap 2 is provided with an annular clearance position 26 at the bottom of the clearance hole 20. After the positive electrode post 1 and the end cap 2 are sealed, the annular abutment part 12 is flush with the bottom end face of the end cap 2, which further increases the sealing between the positive electrode post 1 and the end cap 2. After the positive electrode post 1 and the end cap 2 are sealed together, UV curing adhesive 22 is provided between the annular groove 13 and the inner wall of the clearance hole 20, which further improves the connection firmness and sealing between the positive electrode post 1 and the end cap 2, and effectively prevents electrolyte leakage.

[0043] Furthermore, refer to Figure 3 and Figure 5 The separator 3 has a mounting hole 30 at its center; the bottom edge of the positive electrode post 1 has a chamfered structure, and an annular snap-fit ​​groove 14 is provided between the annular abutment part 12 and the bottom end of the positive electrode post 1. The mounting hole 30 is provided at the bottom end of the positive electrode post 1; the separator 3 is snapped into the annular snap-fit ​​groove 14, so that the separator 3 can be fixedly installed at the bottom end of the positive electrode post 1 and located below the end cover 2, so that the insulation isolation between the end cover 2 and the cell is effectively solved, and the safety and stability of the finished battery are improved.

[0044] refer to Figure 5 and Figure 6 In this embodiment, to facilitate the assembly of the cover plate assembly, at least two positioning posts 31 are provided on the separator 3, and at least two matching positioning holes 27 are provided on the bottom of the end cap 2. The positioning posts 31 and positioning holes 27 enable precise alignment and sealing between the end cap 2 and the separator 3 through rapid positioning. On the other hand, for the safe use of the finished battery, an explosion-proof valve 23 is provided on the separator 3, and a protective plate 24 is provided on the end cap 2. The protective plate 24 has a pressure relief hole. The protective plate 24 and the explosion-proof valve 23 are coaxially arranged. When the temperature or pressure inside the finished battery reaches a certain threshold, the explosion-proof valve 23 will burst and release pressure through the pressure relief hole on the protective plate 24, further improving the safety of the finished battery.

[0045] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A battery electrolyte filling hole structure, disposed on the positive electrode post, characterized in that, The battery electrolyte filling hole structure includes an electrolyte filling hole and an annular baffle. The electrolyte filling hole penetrates the positive electrode post. The annular baffle is disposed around the inlet of the electrolyte filling hole on the upper end face of the positive electrode post and surrounds the inlet of the electrolyte filling hole. The outlet of the electrolyte filling hole is flush with the bottom end face of the positive electrode post.

2. The battery electrolyte injection hole structure according to claim 1, characterized in that, The annular baffle and the positive electrode post are integrally formed, and the outer diameter of the annular baffle is larger than the outer diameter of the positive electrode post.

3. The battery electrolyte injection hole structure according to claim 2, characterized in that, The inner wall of the annular retaining edge has a tapered structure that is wider at the top and narrower at the bottom.

4. The battery electrolyte injection hole structure according to claim 3, characterized in that, The injection hole consists of two parts: the inner wall of the annular baffle is the upper half of the injection hole, and the lower half of the injection hole is a circular hole of equal diameter.

5. The battery electrolyte injection hole structure according to claim 4, characterized in that, The diameter of the lower half of the injection hole is smaller than the diameter of the lowest end of the inner wall of the annular retaining edge.

6. A cover plate assembly comprising the battery electrolyte filling hole structure according to any one of claims 1-5, characterized in that, It also includes an end cap for installing the positive electrode post and an insulating plate disposed at the bottom of the end cap, the positive electrode post being disposed between the end cap and the insulating plate, and the annular retaining edge extending above the end cap.

7. A cover plate assembly according to claim 6, characterized in that, The outer diameter of the positive electrode post is provided with an annular abutment portion integrally formed therewith, and an annular groove is formed between the annular abutment portion and the annular retaining edge.

8. A cover plate assembly according to claim 7, characterized in that, The end cap has a clearance hole at its center, and the annular retaining edge passes through the clearance hole and extends to the top of the end cap; the annular abutment part and the bottom of the end cap are sealed and fixedly connected by an insulating sealant layer; UV-curable adhesive is provided between the annular groove and the inner wall of the clearance hole.

9. A cover plate assembly according to claim 8, characterized in that, The insulating sheet has a mounting hole at its center; the bottom edge of the positive electrode post has a chamfered structure; an annular snap-fit ​​groove is provided between the annular abutment part and the bottom end of the positive electrode post; the mounting hole passes through the bottom end of the positive electrode post; the insulating sheet is snapped into the annular snap-fit ​​groove.

10. A cover plate assembly according to claim 9, characterized in that, A sealing pin is provided at the inlet of the injection hole, and the sealing pin is sealed to the inner wall of the annular baffle. The upper end face of the sealing pin is flush with the upper end face of the annular baffle. An annular step for encapsulating the battery casing is provided on the circumference of the end cap.

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