New energy battery cover plate with octagonal pole and buckle insulating piece

Abstract

The application provides a new energy battery cover plate with octagonal pole columns and buckle insulating pieces, and belongs to the technical field of battery cover plates. The new energy battery cover plate with octagonal pole columns and buckle insulating pieces comprises an upper cover body, pole columns, a base, a first encapsulation structure, a riveting structure and a second encapsulation structure. The new energy battery cover plate with octagonal pole columns and buckle insulating pieces is characterized in that the first encapsulation structure is arranged in advance on the base of the pole columns, then the riveting structure is used to rivet the first encapsulation structure, so that the pole columns and the upper cover body are stably connected, then the second encapsulation structure completely encapsulates the riveting structure and the first encapsulation structure, and an insulating sealing area is formed between the upper cover body and the pole columns. The first encapsulation structure is radially and axially constrained on the outside, the springback deformation of the riveting structure under the action of long-term load and cold and hot cycles is inhibited, the local direct connection of the first encapsulation structure and the second encapsulation structure is combined, the two encapsulation structures form a continuous integrated structure, and the connection strength of the pole columns and the cover plate and the stability and reliability of long-term use are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of battery cover technology, specifically to a new energy battery cover with an octagonal terminal post and a snap-fit ​​insulating component. Background Technology

[0002] With the continuous increase in global energy structure transformation and environmental protection demands, industries such as new energy vehicles and energy storage systems are developing rapidly. Lithium-ion batteries and other secondary batteries, as core power sources, directly affect the range and lifespan of end products through their performance, safety, and reliability. The battery cover, as a key component in the battery packaging structure, not only serves the function of electrode lead-out but also needs to achieve long-term reliable sealing of the battery's interior. Its structural stability and sealing performance directly affect the battery's safety level.

[0003] Under the requirements of high energy density and complex operating conditions (such as cold and heat cycles and vibration shocks caused by frequent charging and discharging), the industry usually adopts a combination of processes such as overmolding, welding and riveting to connect and seal the cover plate body and the pole post in order to improve structural strength and sealing reliability.

[0004] However, most of the existing multi-process composite connection methods are simple superpositions, and they still have obvious shortcomings in terms of structural coordination and interface bonding. Specifically, they are: (1) Spatial separation of connection methods and poor cooperative force-bearing capacity: For example, welding and injection molding are used on different sides of the cover plate. The two connection methods are independent of each other in space and rely only on their respective interfaces to bear the load. They cannot form an overall cooperative force-bearing structure, resulting in limited improvement in overall connection strength.

[0005] (2) Multiple processes are superimposed in the same area but lack structural coupling: For example, welding or riveting is performed first, followed by injection molding and encapsulation. The resulting injection molding layer usually only covers the surface of the metal connection area, and the relationship between it and the metal substrate is mostly a simple surface adhesion. Due to the significant difference in the coefficients of thermal expansion between metal and plastic materials, under the effects of thermal cycling and vibration during the long-term charging and discharging of the battery, stress concentration is easily generated at the interface, which can lead to the formation of micro gaps or even interface peeling, resulting in a gradual deterioration of sealing performance and insufficient stability in long-term use.

[0006] Therefore, how to achieve effective synergy in the multi-process connection between the pole and the cover plate, and effectively improve the overall connection strength and the stability and reliability of long-term use, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] This invention provides a new energy battery cover with an octagonal terminal post and a snap-fit ​​insulating component, comprising an upper cover, a lower insulator, and a terminal post. The upper cover has a through hole for mounting the terminal post. The bottom of the terminal post has a radially outwardly protruding base, the upper surface and outer periphery of which are covered with a first adhesive-coated structure. A riveting structure is provided at the upper end of the through hole, and the riveting structure is riveted to the upper surface of the first adhesive-coated structure, forming a composite connection structure of axial limiting and radial constraint between the terminal post and the upper cover. The through hole has a stepped structure, and an insulating sealing ring is provided between the stepped surface and the bottom surface of the base. The upper port of the through hole is covered with a second rubber coating structure, which completely covers the riveting structure and the first rubber coating structure, forming an insulating and sealed connection area between the pole and the upper cover, and providing radial and axial constraints on the riveting structure to suppress its springback deformation under long-term load and thermal cycling. The second rubber coating structure is also partially directly connected to the first rubber coating structure to form a continuous integrated structure. A snap-fit ​​area is provided in the lower port of the through hole. A snap-fit ​​interface is provided on the lower insulator, which is inserted into the lower port of the through hole and snaps into the snap-fit ​​area, while simultaneously sealing against the insulating sealing ring.

[0008] In one possible implementation, an annular groove is formed on the upper surface of the first overmolded structure, and the riveting structure covers part of the annular groove.

[0009] In one possible implementation, the outer edge of the annular groove is provided with a plurality of rectangular grooves distributed circumferentially, all of which are in communication with the annular groove.

[0010] In one possible implementation, the outer edge of the base and the first rubber-coated structure is polygonal; the through hole is provided with a corresponding limiting structure.

[0011] In one possible implementation, the riveting structure is a plurality of raised steps circumferentially distributed along the upper end of the through hole.

[0012] In one possible implementation, annular steps are provided on both the upper and lower surfaces of the insulating sealing ring, and annular grooves that engage with the annular steps are provided on the lower surface of the base and the stepped surface of the through hole.

[0013] In one possible implementation, the diameter of the annular steps varies.

[0014] In one possible implementation, the fastening area is an annular inner chamfered structure, and the fastening interface is a boss with a slot.

[0015] In one possible implementation, the second overmolded structure is welded to the first overmolded structure.

[0016] The above-mentioned one or more technical solutions in the embodiments of the present invention have the following technical effects: According to the embodiments of the present invention, a new energy battery cover with an octagonal pole and a snap-fit ​​insulating component is provided. A first coating structure is pre-set on the base of the pole. Then, the first coating structure is riveted by a riveting structure to form a composite connection structure with axial limiting and radial constraint between the pole and the upper cover, so that the pole and the upper cover form a stable connection. Then, the second coating structure completely covers the riveting structure and the first coating structure, forming an insulating and sealed area between the upper cover and the pole. The external constraint of the radial and axial constraints of the first coating suppresses the rebound deformation of the riveting structure under long-term load and thermal cycle. Combined with the direct connection between the first coating structure and the second coating structure, the two coating structures form a continuous integrated structure. They can work together during the stress process, effectively improving the connection strength between the pole and the cover and the stability and reliability of long-term use. At the same time, combined with the sealing area formed by the insulating sealing ring between the base and the through hole step and the sealing area formed by the first coating structure between the base and the through hole, the sealing performance of the overall structure is effectively guaranteed. In addition, the engagement of the buffer groove with the annular step and the setting of the rectangular groove prevent the pole from shifting, improve the torsional resistance of the overall structure, further enhance the reliability and stability of the overall structure connection, and the overall structure is simple and easy to assemble and produce. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a new energy battery cover with an octagonal pole and a snap-fit ​​insulating component provided in an embodiment of the present invention;

[0018] Figure 2 This is a partial structural schematic diagram of a new energy battery cover with an octagonal pole and a snap-fit ​​insulating component provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the electrode post and base of a new energy battery cover with an octagonal electrode post and a snap-fit ​​insulating component provided in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the first encapsulated colloid of a new energy battery cover plate with an octagonal pole and a snap-fit ​​insulating component provided in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the riveting structure of a new energy battery cover with an octagonal pole and a snap-fit ​​insulating component provided in an embodiment of the present invention, before and after riveting.

[0022] In the diagram: 1. Upper cover; 2. Lower insulator; 3. Pole post; 4. Through hole; 41. Polygonal segment; 42. Annular segment; 5. Base; 6. First rubber-coated structure; 7. Riveting structure; 8. Insulating sealing ring; 9. Second rubber-coated structure; 10. Fastening area; 11. Fastening interface; 12. Annular groove; 13. Rectangular groove; 14. Annular step; 15. Annular groove. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Please see Figures 1-5 A new energy battery cover with octagonal poles and snap-fit ​​insulation components includes an upper cover 1, a lower insulator 2 and poles 3. The upper cover 1 is provided with two through holes 4, which are symmetrically distributed on the left and right. There are two poles 3, which are installed in the through holes 4 respectively. One pole 3 is a positive pole made of all aluminum, and the other is a negative pole made of copper-aluminum composite.

[0025] The bottom of the pole post 3 is provided with a radially outward protruding base 5, such as... Figure 3 As shown, the pole post 3 has a cylindrical structure, and the base 5 is an integral structure with the pole post 3. The outer edge of the base 5 has a polygonal structure, specifically an octagonal structure. The upper surface and outer periphery of the base 5 are covered with a first adhesive-coated structure 6, and the outer edge of the first adhesive-coated structure 6 is also an octagonal structure (e.g., ...). Figure 4 (As shown). The first encapsulated structure 6 is pre-molded before the pole post 3 and the upper cover 1 are assembled.

[0026] The through hole 4 includes a polygonal segment 41 and an annular segment 42 arranged sequentially from top to bottom. The polygonal segment 41 has an octagonal structure, forming a limiting structure adapted to the first rubber-coated structure 6, used to restrict the circumferential rotation of the pole post 3. A stepped surface is formed between the annular segment 42 and the polygonal segment 41, and an insulating sealing ring 8 (such as...) is placed on the stepped surface. Figure 4 (As shown). The coated electrode post 3 is placed in the through hole 4 from top to bottom. The base 5 presses the insulating sealing ring 8 to make the electrode post 3 and the upper cover 1 in an insulated and sealed connection state. The first coated structure 6 is located between the base 5 and the polygonal segment 41, and the first coated structure 6 and the polygonal segment 41 fit tightly together to further form an insulated and sealed connection area.

[0027] A riveting structure 7 is provided at the upper end of the polygonal segment 41. The riveting structure 7 consists of several raised steps distributed circumferentially along the upper end of the polygonal segment 41. Specifically, a raised step is provided at the position of each side of the polygonal segment 41. After the pole post 3 is inserted into the through hole 4, the riveting structure 7 is riveted to the upper surface of the first rubber-coated structure 6 (e.g., Figure 2 As shown, a composite connection structure with axial limiting and radial constraint is formed between the pole post 3 and the upper cover 1, so that a stable connection is formed between the pole post 3 and the upper cover 1.

[0028] Subsequently, a second overmolded structure 9 is injection molded at the upper end of polygonal segment 41. This second overmolded structure 9 completely covers the riveting structure 7, forming external constraints that provide radial and axial restraint. This suppresses the springback deformation of the riveting structure 7 under long-term loads and thermal cycling, improving the stability of the connection between the pole post 3 and the upper cover 1 under vibration, thermal cycling, and other conditions. Furthermore, the riveting structure 7 does not completely cover the upper surface of the first overmolded structure 6 (e.g., ...). Figure 5 (As shown). The second coating structure 9 completely covers the first coating structure 6 and forms an insulating and sealed connection area between the electrode post 3 and the upper cover 1. During the injection molding process of the second coating structure 9, the molten injection liquid will fuse with the first coating structure 6, so that the two coating structures form a continuous integrated structure. Under stress, they can work together to significantly improve the reliability of the connection between the electrode post 3 and the upper cover 1 and the stability of long-term use. Furthermore, through the sealing performance of the insulating sealing ring 8, the tight fit and seal between the first coating structure 6 and the polygonal segment 41 of the through hole 4, and the insulating seal formed by the second coating structure 9, the reliability of the sealed connection between the electrode post 3 and the upper cover 1 is effectively ensured. Among them, the first coating structure 6 and the corresponding second coating structure 9 on the positive electrode post are coated with conductive PPS, while the first coating structure 6 and the corresponding second coating structure 9 on the negative electrode post are coated with insulating PPS.

[0029] See Figure 2 , Figure 4 and Figure 5 The upper surface of the first overmolded structure 6 has an annular groove 12. The riveting structure 7 partially covers the annular groove 12. During the injection molding process of the second overmolded structure 9, the molten injection molding liquid flows into the annular groove 12, further enhancing the bonding force between the second overmolded structure 9 and the first overmolded structure 6. At the same time, it enhances the constraint force that inhibits the radial movement of the pole post 3, improving the reliability of the connection between the pole post 3 and the upper cover 1. Furthermore, a number of rectangular grooves 13 distributed circumferentially are provided on the outer edge of the annular groove 12. The rectangular grooves 13 are all connected to the annular groove 12. The molten injection molding liquid fills the rectangular grooves 13, further enhancing the circumferential torsional resistance of the pole post 3, and further improving the reliability of the connection between the pole post 3 and the upper cover 1.

[0030] See Figure 2Annular steps 14 are provided on both the upper and lower surfaces of the insulating sealing ring 8. Annular grooves 15, which engage with the annular steps 14, are provided on the lower surface of the base 5 and the stepped surface of the through hole 4. The annular steps 14 on the lower surface of the insulating sealing ring 8 engage with the annular grooves 15 on the stepped surface of the through hole 4, preventing the insulating sealing ring 8 from shifting position and forming a concave sealing interface. The annular steps 14 on the upper surface of the insulating sealing ring 8 engage with the annular grooves 15 on the lower surface of the base 5. This serves to limit the position of the pole post 3 in the area of ​​the through hole 4. Combined with the first rubber-coated structure 6 and the octagonal structure on the outer edge of the polygonal segment 41, this effectively prevents the pole post 3 from shifting during assembly. Simultaneously, a concave sealing interface is formed between the base 5 and the insulating sealing ring 8, effectively enhancing the overall sealing performance. The annular steps 14 have different diameters, and the two sealing interfaces are staggered vertically, effectively avoiding stress concentration and improving the reliability of the structure.

[0031] See Figure 2 A snap-fit ​​area 10 is provided within the annular segment 42 of the through hole 4. The snap-fit ​​area 10 has an annular inner chamfer structure. A snap-fit ​​interface 11 is provided on the lower insulator 2. The snap-fit ​​interface 11 is a boss with a groove. After the second rubber-coated structure 9 is injection molded, the lower insulator 2 is assembled so that its snap-fit ​​interface 11 is inserted into the snap-fit ​​area 10 within the annular segment 42 for snap-fit, and at the same time, it is tightly sealed against the insulating sealing ring 8. In order to further improve the stability of the connection between the lower insulator 2 and the upper cover 1, multiple sets of snap-fit ​​structures or riveting structures are provided between the lower insulator 2 and the upper cover 1 to make the two stably connected together.

[0032] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; 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; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A new energy battery cover with an octagonal terminal post and a snap-fit ​​insulating component, comprising an upper cover, a lower insulator, and a terminal post, characterized in that: The upper cover is provided with through holes for installing pole posts; The bottom of the pole post is provided with a radially outward protruding base, and the upper surface and outer periphery of the base are covered with a first adhesive structure. A riveting structure is provided at the upper end of the through hole. The riveting structure is riveted to the upper surface of the first rubber-coated structure, forming a composite connection structure of axial limiting and radial constraint between the pole and the upper cover. The through hole has a stepped structure, and an insulating sealing ring is provided between the stepped surface and the bottom surface of the base. The upper end of the through hole is covered with a second rubber coating structure. The second rubber coating structure completely covers the riveting structure and the first rubber coating structure, forming an insulating and sealed connection area between the pole post and the upper cover body, and forming radial and axial constraints on the riveting structure to suppress the springback deformation of the riveting structure under long-term load and thermal cycle. The second rubber coating structure is locally directly connected to the first rubber coating structure to form a continuous integrated structure. A snap-fit ​​area is provided inside the lower port of the through hole; a snap-fit ​​interface is provided on the lower insulator. The snap-fit ​​interface is inserted into the lower port of the through hole and snaps into the snap-fit ​​area, while simultaneously abutting against the insulating sealing ring for a sealed connection.

2. A new energy battery cover with an octagonal terminal post and a snap-fit ​​insulating component as described in claim 1, characterized in that: The upper surface of the first rubber-coated structure has an annular groove, and the riveting structure covers part of the annular groove.

3. A new energy battery cover with an octagonal terminal post and a snap-fit ​​insulating component as described in claim 2, characterized in that: The outer edge of the annular groove is provided with several rectangular grooves distributed circumferentially, and all rectangular grooves are connected to the annular groove.

4. A new energy battery cover with an octagonal terminal post and a snap-fit ​​insulating component as described in claim 1, characterized in that: The outer edge of the base and the first rubber-coated structure is polygonal; the through hole is provided with a corresponding limiting structure.

5. A new energy battery cover with an octagonal terminal post and a snap-fit ​​insulating component according to any one of claims 1-4, characterized in that: The riveting structure consists of several raised steps distributed circumferentially along the upper end of the through hole.

6. A new energy battery cover with an octagonal terminal post and a snap-fit ​​insulating component as described in claim 1 or 4, characterized in that: The upper and lower surfaces of the insulating sealing ring are provided with annular steps, and the lower surface of the base and the stepped surface of the through hole are respectively provided with annular grooves that fit into the annular steps.

7. A new energy battery cover with an octagonal terminal post and a snap-fit ​​insulating component as described in claim 6, characterized in that: The diameters of the annular steps are different.

8. A new energy battery cover with an octagonal terminal post and a snap-fit ​​insulating component according to claim 1, characterized in that: The fastening area has an annular inner chamfer structure, and the fastening interface is a boss with a slot.

9. A new energy battery cover with an octagonal terminal post and a snap-fit ​​insulating component according to claim 1, characterized in that: The second coating structure and the first coating structure form a fusion connection.

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