Cover plate assembly for a power cell

Abstract

This utility model provides a cover plate assembly for a power battery, belonging to the field of mechanical technology. The cover plate assembly for a power battery includes a substrate, an insulating plate, an insulating ring, a connecting piece, and terminals. The substrate is made of metal, and the insulating plate and insulating ring are both insulating materials. The substrate is elongated and has a through-hole. The insulating plate is fixed to the lower part of the substrate. The insulating ring is fitted onto the terminals and fixed to the connecting hole in the substrate. The connecting piece has a cylindrical terminal. The connecting piece is tightly attached to the bottom of the insulating plate, and the terminal is connected to the connecting hole. The terminals are embedded in the terminals, and the two are tightly fitted together. A folded sealing structure is provided between the terminals and the insulating ring. This cover plate assembly for a power battery exhibits high stability.

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology, and more specifically to a cover plate assembly for power batteries. Background Technology

[0002] The battery cover is an important component of the battery pack, mainly used to seal and protect individual battery cells or modules, while providing necessary electrical connections, safety valve mechanisms, and interfaces for integration with other systems.

[0003] It can be seen that the cover plate is directly related to the battery's safety, performance, and lifespan.

[0004] In existing battery covers, the connecting piece and the substrate are directly sealed using existing sealing rings. Since the existing sealing rings are flat ring structures, their sealing is too simple, resulting in poor sealing performance.

[0005] The cover plate disclosed in Chinese Patent Publication No. CN217934000U includes: a top cover having a first mounting hole; an electrode post disposed in the first mounting hole, the electrode post including an electrode post body and several fixing claws, the several fixing claws being disposed on the electrode post body; and a conductive connecting piece having several fixing holes for the several fixing claws to pass through, the several fixing claws being bent away from the center of the electrode post body under the action of external force after passing through the corresponding fixing holes, so as to press the conductive connecting piece and fix the electrode post on the top cover.

[0006] In the aforementioned patent, the electrode post is secured and sealed by riveting a fixing claw to a conductive connecting piece, resulting in a good securing effect. It can be seen that although the connection stability of the aforementioned patent is relatively good, it still uses a single sealing ring, leading to relatively poor sealing performance. Utility Model Content

[0007] The purpose of this invention is to address the aforementioned problems in existing technologies by providing a compact and well-sealed cover assembly for power batteries.

[0008] To achieve the above objectives, this utility model can be implemented through the following technical solutions:

[0009] A cover plate assembly for a power battery includes a substrate, an insulating plate, an insulating ring, a connecting piece, and a terminal post. The substrate is made of a metal material, and the insulating plate and the insulating ring are both insulating materials. The substrate is elongated and has a through-hole. The insulating plate is fixed to the lower part of the substrate. The insulating ring is fitted onto the terminal post and fixed to the connecting hole in the substrate. The connecting piece has a cylindrical terminal. The connecting piece is tightly attached to the bottom of the insulating plate, and the terminal is connected to the connecting hole. The terminal post is embedded in the terminal, and the two are tightly fitted together. A folded sealing structure exists between the terminal and the insulating ring.

[0010] In the aforementioned cover plate assembly for power batteries, the terminals and connecting pieces are an integral structure.

[0011] In the aforementioned cover plate assembly for power batteries, the insulating ring includes a cylindrical upper cylinder and a lower cylinder located below the upper cylinder. The upper cylinder and the lower cylinder are coaxially aligned, and the outer diameter of the upper cylinder is larger than that of the lower cylinder. The upper port of the connecting hole of the substrate has an annular recessed connecting seat. The lower end of the upper cylinder matches the connecting seat and the two are connected. The lower cylinder is embedded in the connecting hole.

[0012] In the aforementioned cover plate assembly for power batteries, the folded sealing structure includes an annular sealing part one and a sealing part two. The sealing part one is located above the sealing part two and the two are arranged coaxially. The sealing part two is located outside the sealing part one. The upper part of the sealing part one contacts the lower end of the lower cylinder, and the lower part of the sealing part abuts against the upper end of the terminal. The sealing part two is pressed tightly between the connecting piece and the substrate.

[0013] In the aforementioned cover plate assembly for power batteries, the sealing part one and the sealing part two are an integral structure and are made of flexible material.

[0014] In the aforementioned cover plate assembly for power batteries, the upper part of the sealing part one near its inner side has an annular protruding support part one, and the side part of the pole post has a protruding support part two, which abuts against the upper part of the support part one.

[0015] In the aforementioned cover plate assembly for power batteries, the upper part of the sealing part two has an annular recessed positioning groove, and the lower port of the connection hole of the substrate has an annular protrusion that matches the positioning groove, and the positioning edge is embedded in the positioning groove.

[0016] In the aforementioned cover plate assembly for power batteries, the dimension of the upper end of the terminal extending into the connection hole is A, and the depth dimension of the connection hole is B, wherein A is 1 / 5 to 1 / 3 of B.

[0017] In the aforementioned cover plate assembly for a power battery, the lower part of the insulating plate has a protruding contact edge that contacts the connecting plate surface.

[0018] In the aforementioned cover plate assembly for power batteries, the connecting piece, insulating ring, and terminal post form a conductive unit, and the number of the conductive units is two, with the two conductive units symmetrically distributed at both ends of the substrate.

[0019] Compared with existing technologies, the folded sealing structure between the terminals and the insulating ring in the cover plate assembly used for power batteries can not only avoid rigid contact between the various parts in the assembly, but also, due to the presence of multiple sealing contact points, the overall sealing performance of the assembly is not only better, but also the sealing points are all located inside, making the structure more compact.

[0020] Meanwhile, the second support portion on the pole cooperates with the first support portion of the folded sealing structure. This structure allows the pole to be inverted, facilitating positioning and further improving its stability. Attached Figure Description

[0021] Figure 1 This is a top-view three-dimensional structural diagram of the cover plate assembly used for power batteries.

[0022] Figure 2 This is a three-dimensional structural diagram of the cover plate assembly used for power batteries, viewed from below.

[0023] Figure 3 This is a cross-sectional structural diagram of a cover plate assembly used for power batteries.

[0024] Figure 4 This is a partial cross-sectional view of the cover plate assembly used for power batteries.

[0025] In the picture:

[0026] 1. Base plate; 1a. Connecting hole; 1a1. Positioning edge; 1b. Connecting seat; 2. Insulating plate; 3. Insulating ring; 3a. Upper cylinder; 3b. Lower cylinder; 3c. Contact edge; 4. Connecting piece; 4a. Terminal; 5. Pole post; 5a. Support part two; 6. Sealing part one; 6a. Support part one; 7. Sealing part two; 7a. Positioning groove. Detailed Implementation

[0027] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings.

[0028] like Figure 1-4 As shown, the cover plate assembly for power batteries includes a substrate 1, an insulating plate 2, an insulating ring 3, a connecting piece 4, and an electrode post 5. The substrate 1 is made of metal, and the insulating plate 2 and the insulating ring 3 are both made of insulating materials.

[0029] In this embodiment, both the insulating plate 2 and the insulating ring 3 are made of rubber.

[0030] The substrate 1 is elongated and has a through connection hole 1a. The insulating plate 2 is fixed to the lower part of the substrate 1. The insulating ring 3 is sleeved on the pole post 5 and fixed to the connection hole 1a of the substrate 1. The connecting piece 4 has a cylindrical terminal 4a. The connecting piece 4 is close to the bottom of the insulating plate 2 and the terminal 4a is connected to the connection hole 1a. The pole post 5 is embedded in the terminal 4a and the two are tightly connected. The terminal 4a and the insulating ring 3 have a folded sealing structure.

[0031] The terminal 4a and the connecting piece 4 are an integral structure.

[0032] The folded sealing structure enables multiple contact surfaces between terminal 4a and insulating ring 3 to be sealed, effectively improving the sealing performance of the entire cover assembly.

[0033] Meanwhile, the integrated structure of terminal 4a and connecting piece 4 not only improves the structural compactness, but also enables the connecting piece 4 to be more stably connected to the substrate 1 under the action of terminal 4a.

[0034] The connecting piece 4 acts as a conductive piece. The connecting piece 4 is existing technology and a commercially available component. Therefore, the specific structural and technical features of the connecting piece 4 will not be described in detail in the embodiments.

[0035] The structural difference between this connecting piece 4 and the existing connecting pieces is that this connecting piece 4 has an additional terminal 4a.

[0036] In this embodiment, substrate 1 is an aluminum alloy plate.

[0037] The insulating ring 3 includes a cylindrical upper cylinder 3a and a lower cylinder 3b located below the upper cylinder 3a. The upper cylinder 3a and the lower cylinder 3b are arranged coaxially, and the outer diameter of the upper cylinder 3a is larger than that of the lower cylinder 3b. The upper port of the connecting hole 1a of the substrate 1 has an annular recessed connecting seat 1b. The lower end of the upper cylinder 3a matches the connecting seat 1b and the two are connected. The lower cylinder 3b is embedded in the connecting hole 1a.

[0038] The insulating ring 3 uses an upper cylinder 3a and a lower cylinder 3b with different outer diameters. The upper cylinder 3a is fitted with the connecting seat 1b on the base plate 1, and the lower cylinder 3b is fitted with the terminal 4a.

[0039] Ultimately, this allows the entire insulating ring 3 to be stably connected to the substrate 1. The pole piece 5 is connected inside the insulating ring 3, indirectly and stably connecting the pole piece 5 to the substrate 1. At the same time, the insulating ring 3 ensures that there is no electrical conductivity between the substrate 1 and the pole piece 5.

[0040] Of course, the insulating plate 2 also prevents the substrate 1 from conducting electricity with the connecting piece 4. Instead, the pole 5 is directly connected to the terminal 4a of the connecting piece 4 to achieve conductivity.

[0041] The folded sealing structure includes a ring-shaped sealing part 6 and a sealing part 7. The sealing part 6 is located on the upper part of the sealing part 7 and the two are arranged coaxially. The sealing part 7 is located outside the sealing part 6. The upper part of the sealing part 6 contacts the lower end of the lower cylinder 3b, and the lower part of the sealing part 6 abuts against the upper end of the terminal 4a. The sealing part 7 is pressed tightly between the connecting piece 4 and the substrate 1.

[0042] Sealing part 6 and sealing part 7 seal their respective joints, effectively improving the overall sealing performance.

[0043] In other words, the folded sealing structure is designed in a Z-shape. In addition to the conventional sealing position, the welding area is also sealed simultaneously, ensuring that the product can maintain its sealing performance even if the welding seal fails due to poor welding or subsequent abnormalities.

[0044] The sealing part 6 and the sealing part 7 are an integral structure and are made of flexible material.

[0045] This structure can appropriately improve its structural compactness. In this embodiment, both sealing part 6 and sealing part 7 are made of rubber.

[0046] The sealing part 6 has an annular protruding support part 6a on its upper part near its inner side, and the pole post 5 has a protruding support part 5a on its side, and the support part 5a abuts against the upper part of the support part 6a.

[0047] The support part 6a and the support part 5a work together to install the pole post 5 inverted.

[0048] The upper part of the sealing part 7 has an annular recessed positioning groove 7a, and the lower port of the connection hole 1a of the substrate 1 has an annular protrusion positioning edge 1a1 that matches the positioning groove 7a. The positioning edge 1a1 is embedded in the positioning groove 7a.

[0049] The positioning groove 7a, when engaged with the positioning edge 1a1, can further improve the connection stability at the connection point.

[0050] The upper end of terminal 4a extends into connection hole 1a by a dimension A, and the depth of connection hole is B. A is 1 / 5 of B. However, depending on the actual situation, A being 1 / 3 of B is also feasible.

[0051] Terminal 4a extends into connection hole 1a. While ensuring connection, it avoids occupying too much space in connection hole 1a, allowing the folded sealing structure to have sufficient space.

[0052] The lower part of the insulating plate 2 has a protruding contact edge 3c, which contacts the surface of the connecting piece 4.

[0053] The contact line 3c can improve the connection stability between the connecting piece 4 and the insulating plate 2, and prevent the connecting piece 4 and the insulating plate 2 from warping.

[0054] The connecting piece 4, the insulating ring 3, and the pole post 5 form a conductive unit. There are two conductive units, and the two conductive units are symmetrically distributed at both ends of the substrate 1.

[0055] The folded sealing structure between the terminals and the insulating ring in the cover plate assembly used for power batteries not only avoids rigid contact between the various parts in the assembly, but also, due to the multiple sealing contact points, the overall sealing performance of the assembly is not only good, but also the sealing points are all located inside, making the structure relatively compact.

[0056] Meanwhile, the second support portion on the pole cooperates with the first support portion of the folded sealing structure. This structure allows the pole to be inverted, facilitating positioning and further improving its stability.

[0057] The above-described technical solution of this utility model addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The parts not covered in this application's technical solution are the same as or can be implemented using existing technologies, and will not be described in detail here.

[0058] The technical solutions in the above embodiments have clearly and completely described the content of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A cover plate assembly for a power battery, comprising a substrate, an insulating plate, an insulating ring, a connecting piece, and a terminal post, wherein the substrate is made of a metallic material, and the insulating plate and the insulating ring are both insulating materials, characterized in that, The substrate is elongated and has a through connection hole. The insulating plate is fixed to the lower part of the substrate. The insulating ring is fitted onto the pole and fixed to the connection hole of the substrate. The connecting piece has a cylindrical terminal. The connecting piece is close to the bottom of the insulating plate and the terminal is connected to the connection hole. The pole is embedded in the terminal and the two are tightly connected. The terminal and the insulating ring have a folded sealing structure.

2. The cover plate assembly for a power battery according to claim 1, characterized in that, The terminal and the connecting piece are an integral structure.

3. The cover plate assembly for a power battery according to claim 1, characterized in that, The insulating ring includes a cylindrical upper body and a lower body located below the upper body. The upper body and the lower body are coaxially arranged, and the outer diameter of the upper body is larger than that of the lower body. The upper port of the connecting hole of the substrate has an annular recessed connecting seat. The lower end of the upper body matches the connecting seat and the two are connected. The lower body is embedded in the connecting hole.

4. The cover plate assembly for a power battery according to claim 1, 2, or 3, characterized in that, The folded sealing structure includes a ring-shaped sealing part one and a sealing part two. The sealing part one is located on the upper part of the sealing part two and the two are arranged coaxially. The sealing part two is located outside the sealing part one. The upper part of the sealing part one contacts the lower end of the lower cylinder, and the lower part of the sealing part one abuts against the upper end of the terminal. The sealing part two is pressed tightly between the connecting piece and the substrate.

5. The cover plate assembly for a power battery according to claim 4, characterized in that, The sealing part one and sealing part two are an integral structure and are made of flexible material.

6. The cover plate assembly for a power battery according to claim 5, characterized in that, The sealing part 1 has an annular protruding support part 1 on its upper part near its inner side, and the pole post side has a protruding support part 2, which abuts against the upper part of the support part 1.

7. The cover plate assembly for a power battery according to claim 6, characterized in that, The upper part of the second sealing part has an annular recessed positioning groove, and the lower port of the connection hole of the substrate has an annular protrusion positioning edge that matches the positioning groove. The positioning edge is embedded in the positioning groove.

8. The cover plate assembly for a power battery according to claim 7, characterized in that, The dimension of the upper end of the terminal extending into the connection hole is A, and the depth dimension of the connection hole is B, wherein A is 1 / 5 to 1 / 3 of B.

9. The cover plate assembly for a power battery according to claim 8, characterized in that, The lower part of the insulating plate has a protruding contact edge, which contacts the connecting plate surface.

10. The cover plate assembly for a power battery according to claim 9, characterized in that, The aforementioned connecting piece, insulating ring, and pole form a conductive unit, and the number of the conductive units is two, with the two conductive units symmetrically distributed at both ends of the substrate.

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