Battery top cover assembly and battery
By integrating the pole column into the lithium-ion/sodium ion cylindrical battery cover assembly and setting up a sealing nail structure, the high cost and explosion-proof valve damage in the top cover structure are solved, and the battery production cost and improvement of production yield is achieved. Effect.
Patent Information
- Application Number
- CN202323571119.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-26
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-26
AI Technical Summary
In the lithium-ion/sodium ion cylindrical battery cover structure, the electrode column is directly riveted and the sealing ring is required to assist in assembly, resulting in high costs. The explosion-proof valve is easily damaged or contaminated by electrolyte, resulting in the battery being scrapped, and an additional film is required to increase the manufacturing cost.
A battery ceiling assembly is designed, in which the electrode column is integrally formed on the ceiling, and the sealing nail structure includes a sealing nail and an explosion-proof valve. The explosion-proof valve is arranged at the pressure relief through hole, and is assembled accordingly when the sealing nail is assembled to avoid direct Explosion-proof valves are installed on the top cover to reduce costs and improve production yield.
It achieves the reduction of battery costs without riveting, avoids damage or contamination of explosion-proof valves, reduces the need for additional films, and improves production efficiency and airtightness of the battery.
Smart Images
Figure CN222190957U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover assembly and a battery. Background Art
[0002] At present, lithium-ion / sodium-ion cylindrical batteries have gradually become mainstream products in the new energy industry due to their high energy density, good capacity consistency, and ability to support high-rate charge and discharge. More and more manufacturers continue to pursue the simplification of cylindrical battery top cover structures to reduce costs and increase energy density. However, the current top cover structure has the following common problems:
[0003] The battery top cover is directly riveted to the pole, and sealing rings are needed to assist in assembly and achieve airtightness, resulting in relatively high battery costs.
[0004] An explosion-proof valve is preset on the surface of the battery top cover. During the battery assembly process, the explosion-proof valve is easily damaged or contaminated by electrolyte, causing the battery to be scrapped, etc. For protection, an additional film is required, which increases the battery manufacturing cost. Summary of the invention
[0005] The purpose of the utility model is to provide a battery top cover assembly and a battery, which can solve at least one technical problem in the background technology.
[0006] In order to achieve the above-mentioned purpose, the utility model provides a battery top cover assembly, including a top cover and a sealing nail structure, the top cover includes a main body and a pole protruding upward from the main body, the upper surface of the pole is concavely provided with a sealing nail groove, and the middle part of the bottom surface of the sealing nail groove is formed with a liquid injection through hole penetrating downward; the sealing nail structure includes a sealing nail and an explosion-proof valve, the sealing nail is provided with a pressure relief through hole, the explosion-proof valve is arranged at the pressure relief through hole, the sealing nail structure is sealingly arranged at the sealing nail groove, and the pressure relief through hole corresponds to the liquid injection through hole.
[0007] Optionally, the pole is formed by protruding upward from the middle portion of the main body.
[0008] Optionally, the side wall of the sealing pin groove is a first inclined surface that gradually retracts inward from top to bottom, and the outer side wall of the sealing pin is a second inclined surface that gradually retracts inward from top to bottom, and the first inclined surface and the second inclined surface are adapted to each other.
[0009] Optionally, laser seam welding is performed between the sealing pin and the side wall of the sealing pin groove.
[0010] Optionally, the pressure relief hole as a whole extends outward beyond the liquid injection hole, the explosion-proof valve is arranged at the bottom of the sealing pin, a chamfer is formed at the position where the bottom wall of the sealing pin groove meets the side wall of the liquid injection hole, and a clamping groove is formed between the explosion-proof valve and the chamfer.
[0011] Optionally, an annular recessed groove communicating with the pressure relief through hole is formed on the bottom surface of the sealing pin, and the outer seal of the explosion-proof valve is fixedly arranged in the annular recessed groove.
[0012] Optionally, a notch for opening the valve is formed on the explosion-proof valve.
[0013] Optionally, the cross-section of the notch is substantially U-shaped.
[0014] Optionally, a convex portion integrally protrudes downward from the inner side of the main body, and the liquid injection through hole is formed on the main body and the convex portion.
[0015] In order to achieve the above-mentioned object, the utility model also provides a battery, comprising the battery top cover assembly as described above.
[0016] In the embodiment of the utility model, the pole is formed integrally on the top cover, that is, it is a part of the top cover itself, and there is no need to assemble the pole on the top cover by riveting or other means, thereby reducing the cost of the battery. In addition, in the embodiment of the utility model, the explosion-proof valve is arranged at the pressure relief through hole opened by the sealing nail, and is not directly arranged on the top cover. When the sealing nail is used for sealing assembly at the rear end of the production process, it can be assembled to the top cover together with the sealing nail, thereby avoiding the problem of damage and contamination of the explosion-proof valve during the battery assembly process caused by the explosion-proof valve directly arranged on the top cover, and even causing the battery to be scrapped. There is no need for additional film to protect the explosion-proof valve, thereby reducing the production cost of the battery and improving the production yield. Moreover, there is no need to open a hole for setting the explosion-proof valve on the top cover. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a three-dimensional structural schematic diagram of a battery top cover assembly according to an embodiment of the utility model.
[0018] Figure 2 It is a three-dimensional structural schematic diagram of the battery top cover assembly from another perspective of the embodiment of the utility model.
[0019] Figure 3 yes Figure 1 Schematic cross-sectional view of the local structure of the battery top cover assembly.
[0020] Figure 4 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle top cover.
[0021] Figure 5 yes Figure 1 Schematic diagram of the three-dimensional structure of the sealing nail structure.
[0022] Figure 6 yes Figure 5 Schematic cross-sectional view of the sealing nail structure.
[0023] Figure 7 It is a three-dimensional structural schematic diagram of a battery in an embodiment of the utility model. DETAILED DESCRIPTION
[0024] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0025] See also Figures 1 to 6 The utility model embodiment discloses a battery top cover assembly, including a top cover 10 and a sealing nail structure, the top cover 10 includes a main body 11 and a pole 12 integrally protruding upward from the main body 11, the upper surface of the pole 12 is concavely provided with a sealing nail groove 13, and a liquid injection through hole 14 penetrating downward is formed in the middle of the bottom surface of the sealing nail groove 13; the sealing nail structure includes a sealing nail 20 and an explosion-proof valve 30, the sealing nail 20 is provided with a pressure relief through hole 21, the explosion-proof valve 30 is arranged at the pressure relief through hole 21, the sealing nail structure is sealingly arranged at the sealing nail groove 13, and the pressure relief through hole 21 corresponds to the liquid injection through hole 14.
[0026] In the embodiment of the utility model, the pole 12 is formed integrally on the top cover 10, that is, it is a part of the top cover 10 itself (grown directly), and there is no need to assemble the pole 12 on the top cover 10 by riveting or other means, thereby reducing the cost of the battery. In addition, in the embodiment of the utility model, the explosion-proof valve 30 is arranged at the pressure relief through hole 21 opened by the sealing nail 20, and is not directly arranged on the top cover 10. When the sealing nail 20 is used for sealing assembly at the rear end of the production process, it can be assembled to the top cover 10 together with the sealing nail 20, thereby avoiding the problem of damage and contamination of the explosion-proof valve 30 during the battery assembly process caused by the explosion-proof valve 30 directly provided on the top cover 10, and even causing the battery to be scrapped. There is no need for additional film to protect the explosion-proof valve 30, thereby reducing the production cost of the battery and improving the production yield. Moreover, there is no need to open a hole for setting the explosion-proof valve 30 on the top cover 10.
[0027] In some embodiments, the pole 12 is formed by protruding upward from the middle of the main body 11, but this is not limited thereto.
[0028] In the example shown in the drawings, the pole 12 is circular, but it is not limited thereto, and may also be elliptical or polygonal, for example.
[0029] In some embodiments, the sealing nail groove 13 is formed by a middle area of the upper surface of the pole 12 being recessed downward.
[0030] Specifically, the sealing nail groove 13 is circular and concentric with the pole 12. However, this is not limited thereto.
[0031] In some embodiments, the side wall of the sealing pin groove 13 is a first inclined surface 131 that gradually retracts from top to bottom, and the outer side wall of the sealing pin 20 is a second inclined surface 22 that gradually retracts from top to bottom, and the first inclined surface 131 and the second inclined surface 22 are adapted to each other. By setting the first inclined surface 131 and the second inclined surface 22 that are adapted to each other, it is not only convenient to assemble the sealing pin 20, but also helpful to ensure the welding effect when laser seam welding is performed between the sealing pin 20 and the side wall of the sealing pin groove 13.
[0032] Specifically, the angle a defined by the first inclined surface 131 is preferably 91° to 135°, and the angle b defined by the second inclined surface 22 is preferably 91° to 135°.
[0033] In some embodiments, the pressure relief through hole 21 as a whole extends outward beyond the injection through hole 14, the explosion-proof valve 30 is arranged at the bottom of the sealing nail 20, a chamfer 15 is formed at the position where the bottom wall of the sealing nail groove 13 and the side wall of the injection through hole 14 meet, and a clamping groove C is formed between the explosion-proof valve 30 and the chamfer 15. By setting the chamfer 15, a clamping groove C is formed between the explosion-proof valve 30 and the chamfer 15, thereby expanding the force-bearing surface of the explosion-proof valve 30.
[0034] Specifically, the pressure relief through hole 21 and the liquid injection through hole 14 are both circular and concentrically arranged.
[0035] Specifically, the bottom surface of the sealing nail 20 is formed with an annular recessed groove 23 connected to the pressure relief through hole 21 , and the outer seal of the explosion-proof valve 30 is fixed in the annular recessed groove 23 , which facilitates the reliable installation of the explosion-proof valve 30 on the sealing nail 20 .
[0036] In some embodiments, a notch 31 for opening the explosion-proof valve 30 is formed. Usually, the notch 31 is arranged on the upper surface of the explosion-proof valve 30, that is, the surface facing the outside of the battery.
[0037] Specifically, the notch 31 may be in a C-shape or an X-shape.
[0038] Specifically, the cross section of the notch 31 is substantially U-shaped, but the present invention is not limited thereto.
[0039] In some embodiments, the inner side of the main body 11 integrally protrudes downward to form a convex portion 16, and the injection hole 14 is formed in the main body 11 and the convex portion 16. By forming the convex portion 16 on the top cover 10 and forming the injection hole 14 in the main body 11 and the convex portion 16, the length of the injection hole 14 can be ensured.
[0040] In some embodiments, the top cover 10 and the sealing pin 20 are both made of aluminum, but are not limited thereto.
[0041] See also Figures 1 to 7 The utility model also discloses a battery, including the battery top cover assembly as described above.
[0042] When assembling the battery, the top cover 10 and the housing 50 can be sealed mechanically (grooving) or laser welded. After the injection / forming process is completed, the sealing pin 20 equipped with the explosion-proof valve 30 is installed in the sealing pin groove 13 and sealed and fixed by laser seam welding.
[0043] The above disclosure is only a preferred example of the present invention, and its role is to facilitate the technical personnel in this field to understand and implement it. Of course, it cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.
Claims
1. A battery top cover assembly, characterized in that: It includes a top cover and a sealing nail structure, the top cover includes a main body and a pole protruding upward from the main body, the upper surface of the pole is concavely provided with a sealing nail groove, and the middle of the bottom surface of the sealing nail groove is formed with a liquid injection through hole penetrating downward; the sealing nail structure includes a sealing nail and an explosion-proof valve, the sealing nail is provided with a pressure relief through hole, the explosion-proof valve is arranged at the pressure relief through hole, the sealing nail structure is sealingly arranged at the sealing nail groove, and the pressure relief through hole corresponds to the liquid injection through hole.
2. The battery top cover assembly according to claim 1, characterized in that: The pole is formed by protruding upward from the middle part of the main body.
3. The battery top cover assembly according to claim 1, characterized in that: The side wall of the sealing pin groove is a first inclined surface that gradually retracts inward from top to bottom, and the outer side wall of the sealing pin is a second inclined surface that gradually retracts inward from top to bottom, and the first inclined surface and the second inclined surface are adapted to each other.
4. The battery top cover assembly according to claim 1 or 3, characterized in that: The sealing pin is seam-welded with the side wall of the sealing pin groove by laser.
5. The battery top cover assembly according to claim 1, characterized in that: The pressure relief through hole as a whole extends outwardly beyond the injection through hole, the explosion-proof valve is arranged at the bottom of the sealing nail, a chamfer is formed at the position where the bottom wall of the sealing nail groove meets the side wall of the injection through hole, and a clamping groove is formed between the explosion-proof valve and the chamfer.
6. The battery top cover assembly according to claim 1 or 5, characterized in that: The bottom surface of the sealing pin is formed with an annular recessed groove which is in communication with the pressure relief through hole, and the outer seal of the explosion-proof valve is fixedly arranged in the annular recessed groove.
7. The battery top cover assembly according to claim 1, characterized in that: The explosion-proof valve is formed with notches for opening the valve.
8. The battery top cover assembly according to claim 7, characterized in that: The cross section of the notch is substantially U-shaped.
9. The battery top cover assembly according to claim 1, characterized in that: A convex portion integrally protrudes downward from the inner side of the main body, and the liquid injection through hole is formed in the main body and the convex portion.
10. A battery, characterized in that: Comprising a battery top cover assembly as described in any one of claims 1 to 9.