Sealing ring heat insulation protection type battery top cover

Abstract

The utility model discloses a sealed circle heat insulation protection formula battery top cover, include: cover plate structure, the cover plate structure is provided with the mounting hole of penetrating through on, pole post subassembly, pole post subassembly installs in mounting hole, and pole post subassembly includes: sealed circle, sealed circle sets up below mounting hole, heat insulation sheet, heat insulation sheet sets up below sealed circle, pole post spare, pole post spare is respectively worn sealed circle and mounting hole, and the lower positioning part is located below heat insulation sheet and is provided with to sealed circle and cover plate structure are set up to the upper resistance of sequentially. Adopt above -mentioned scheme, provide a kind of heat insulation sheet's setting between sealed circle and lower positioning part to make heat insulation piece can effectively prevent or reduce pole post spare and pass heat to sealed circle and lead to sealed circle burn damage sealed circle heat insulation protection formula battery top cover.

Description

Technical Field

[0001] This utility model belongs to the field of battery top covers, specifically relating to a sealing ring heat insulation protection type battery top cover. Background Technology

[0002] The battery top cover requires a sealing ring to fill the space between the top cover and the terminals to prevent liquid or gas leakage and ensure the battery top cover's airtightness. The sealing ring is typically made of fluororubber. Under pressure or temperature changes, the sealing ring effectively prevents liquid or gas from leaking from the joints.

[0003] To ensure the safe use of lithium batteries, a short-circuit test is required. During the short-circuit test, the temperature of the terminals can reach 500°C, which can cause the sealing rings that are in direct contact with the terminals to burn and lead to sealing failure. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a heat-insulating battery top cover with a sealing ring, which can effectively prevent or reduce the heat transfer from the terminal post to the sealing ring and thus prevent the sealing ring from burning and being damaged by the heat insulation component by setting a heat insulation sheet between the sealing ring and the lower positioning part.

[0005] To achieve the above objectives, this utility model provides the following technical solution: comprising: a cover plate structure with a through mounting hole; an electrode assembly installed in the mounting hole, the electrode assembly including: a sealing ring disposed below the mounting hole; a heat insulation sheet disposed below the sealing ring; a positioning element disposed above the mounting hole; and an electrode member passing through the sealing ring and the mounting hole, the electrode member having a lower positioning portion below the heat insulation sheet and an upper positioning portion above the positioning element; the lower positioning portion, the heat insulation sheet, the sealing ring, and the cover plate structure are sequentially arranged facing upwards and abutting against each other; the upper positioning portion, the positioning element, and the cover plate structure are sequentially arranged facing downwards and abutting against each other.

[0006] The present invention is further configured such that: the sealing ring is made of fluororubber; and / or, the heat insulation sheet is made of carbon fiber.

[0007] The present invention is further configured such that: the heat insulation sheet is fixedly connected to the lower positioning part by downward laser penetration welding; or, the outer periphery of the heat insulation sheet and the lower positioning part are fixedly connected by laser welding; or, the heat insulation sheet and the lower positioning part are glued together; or, the lower side of the sealing ring only contacts the heat insulation sheet; or, the lower side of the sealing ring partially contacts the heat insulation sheet and partially contacts the lower positioning part.

[0008] The present invention is further configured such that: a positioning groove is provided on the top of the lower positioning part, and the heat insulation sheet is at least partially placed in the positioning groove for positioning and installation; and / or, the heat insulation sheet is arranged in a ring shape so that the heat insulation sheet continuously contacts the lower circumference of the sealing ring.

[0009] The present invention is further configured such that: the pole piece includes a lower part and an upper part, the lower positioning part is disposed on the lower part, the upper part is disposed on the upper side of the lower part, and the upper part and the lower part are fixedly connected by welding or riveting.

[0010] The present invention is further configured such that: a first connecting surface is provided below the upper part, and a second connecting surface is provided above the lower part, the first connecting surface and the second connecting surface are fitted together; the lower part and the upper part are ultrasonically welded to form a first weld layer between the first connecting surface and the second connecting surface, or the lower part is laser-penetrating welded upward to form a welded part and the welded part forms a second weld layer between the first connecting surface and the second connecting surface.

[0011] The present invention is further configured such that: the number of the welding parts is multiple, each welding part is arranged in a ring, and each welding part is arranged in a ring from the inside to the outside.

[0012] The present invention is further configured such that: the lower part includes a cylindrical extension section and a connecting top that covers the upper end of the extension section; the lower positioning part is annular and is disposed on the lower outer periphery of the extension section; the second connecting surface is disposed above the connecting top; a mating protrusion is provided on the lower part of the upper part, and the first connecting surface is disposed below the mating protrusion.

[0013] The present invention is further configured such that: the inner circumference of the positioning member is provided with a first positioning protrusion that is inserted downward into the mounting hole; the outer circumference of the positioning member is provided with a second positioning protrusion that is arranged upward around the upper outer circumference; and the cover plate structure is provided with a third positioning protrusion that is arranged upward around the outer circumference of the positioning member.

[0014] The present invention is further configured such that: the electrode assembly is divided into a positive electrode and a negative electrode, the upper part and the lower part of the positive electrode are made of aluminum, the upper part of the negative electrode is made of aluminum, and the lower part of the negative electrode is made of copper.

[0015] By adopting the above technical solution, a heat insulation sheet is installed between the sealing ring and the lower positioning part. This allows the heat insulation sheet to effectively block the high-temperature electrode from directly transferring heat to the sealing ring during short-circuit tests or when the lithium battery is short-circuited during operation. This prevents the sealing ring from being burned and protects it to ensure effective sealing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an assembly drawing illustrating a specific embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of a specific embodiment of the present utility model;

[0019] Figure 3 for Figure 2 Enlarged view of part of the image;

[0020] Figure 4 for Figure 2 Enlarged view of part of the image;

[0021] Figure 5 This is an exploded view of a specific embodiment of the present utility model;

[0022] Figure 6 This is an exploded view of a specific embodiment of the present utility model;

[0023] Figure 7 for Figure 3 A magnified view of A in the middle.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Cover plate structure;

[0026] 11. Top cover; 12. Lower plastic part;

[0027] 111. Mounting hole; 112. Third positioning protrusion;

[0028] 2. Terminal assembly;

[0029] 21. Pole post; 22. Sealing ring; 23. Heat insulation sheet; 24. Positioning component;

[0030] 211. Lower part; 212. Upper part; 241. First positioning convex part; 242. Second positioning convex part;

[0031] 2111 Lower positioning part; 2112 Extension tube part; 2113 Connecting top; 2114 Connecting ear; 2121 Upper positioning part;

[0032] 21111, Positioning groove; 21131, Second connecting surface; 21211, Mating protrusion; 21212, First connecting surface;

[0033] 31. Positive terminal; 32. Negative terminal;

[0034] 4. Welding section;

[0035] 41. Second weld layer. Detailed Implementation

[0036] To enable those skilled in the art to better understand this utility model and to more clearly define the scope of protection claimed by this utility model, the present utility model is described in detail below with reference to certain specific embodiments. It should be noted that the following are only some specific embodiments of the present utility model, and the specific and direct descriptions of related structures are merely for the convenience of understanding the present utility model; the specific features do not necessarily or directly limit the scope of implementation of the present utility model. Conventional choices and substitutions made by those skilled in the art under the guidance of the present utility model should all be considered within the scope of protection claimed by this utility model.

[0037] like Figures 1-7 As shown, this utility model discloses a battery top cover with a sealing ring and heat insulation protection, comprising:

[0038] The cover plate structure 1 has mounting holes 111 extending vertically through its left and right sides, respectively.

[0039] The pole assembly 2 consists of two sets, namely a positive pole 31 and a negative pole 32. The positive pole 31 is installed in the mounting hole 111 on the right side, and the negative pole 32 is installed in the mounting hole 111 on the left side.

[0040] Each pole post assembly 2 includes:

[0041] The sealing ring 22 is made of fluororubber and is located below the mounting hole 111.

[0042] Heat insulation sheet 23, made of carbon fiber, is located below sealing ring 22;

[0043] The pole piece 21 is provided with a sealing ring 22 and a mounting hole 111 respectively, and the pole piece 21 is provided with a lower positioning part 2111 below the heat insulation sheet 23.

[0044] When the pole assembly 2 is fixedly installed on the cover plate structure 1, the lower positioning part 2111, the heat insulation sheet 23, the sealing ring 22 and the cover plate structure 1 are arranged in sequence facing upwards and abutting each other.

[0045] Therefore, by setting a heat insulation sheet 23 between the sealing ring 22 and the lower positioning part 2111, the heat insulation sheet 23 effectively blocks the high-temperature electrode 21 from directly transferring heat to the sealing ring 22 during short circuit tests or when the lithium battery is in operation. This makes the sealing ring 22 less likely to be burned and protects the sealing ring 22 to ensure effective sealing.

[0046] In this embodiment, the cover plate structure 1 includes an upper cover plate 11 and a lower plastic part 12. The mounting hole 111 is provided on the upper cover plate 11, and the upper surface of the sealing ring 22 abuts against the lower surface of the upper cover plate 11.

[0047] Therefore, the sealing ring 22 is directly disposed on the upper cover plate 11, so that the gap between the sealing ring 22 and the cover plate structure 1 is only the gap between the upper cover plate 11 and the sealing ring 22, and the sealing performance is ensured by the sealing ring 22 pressing and sealing.

[0048] Each connecting part has an integrally formed connecting ear 2114 on both the front and rear sides. Each connecting ear 2114 extends in the left and right direction to approach the other pole post assembly 2, so that the pole can be directly welded to the connecting ear 2114 under the action of the connecting ear 2114. The traditional method is to first weld the connecting piece at the bottom of the assembled pole post 21, and then weld the pole to the connecting piece. Compared with the transmission method, the direct integral forming of the connecting ear 2114 results in fewer parts and more convenient processing.

[0049] Preferably, the heat insulation sheet 23 is arranged in a ring shape so that the heat insulation sheet 23 continuously contacts the lower circumference of the sealing ring 22. In addition, the top of the lower positioning part 2111 is provided with a ring-shaped positioning groove 21111. The thickness of the heat insulation sheet 23 is the same as the depth of the positioning groove 21111. The outer circumferential shape and size of the heat insulation sheet 23 are the same as the shape and size of the inner circumferential wall of the positioning groove 21111, so that the heat insulation sheet 23 is built into the positioning groove 21111.

[0050] Therefore, the positioning groove 21111 is used to limit the radial direction of the heat insulation sheet 23, so as to ensure the stability of the positioning and installation of the heat insulation sheet 23. In addition, since the thickness of the heat insulation sheet 23 is the same as the depth of the positioning groove 21111, when the heat insulation sheet 23 is placed in the positioning groove 21111, the upper surface of the heat insulation sheet 23 is flush with the upper surface of the lower positioning part 2111, so that the sealing ring 22 can be installed more smoothly.

[0051] The heat insulation sheet 23 can be fixedly connected to the lower positioning part 2111 by adhesive bonding, which also seals the gap between the two. Alternatively, laser penetration welding can be used to form a ring-shaped welded structure between the heat insulation sheet 23 and the lower positioning part, achieving a fixed connection while sealing the gap between them. Specifically, since the heat insulation sheet 23 is usually relatively thin and the lower positioning part 2111 is relatively thick, laser penetration welding can be performed from the upper side of the heat insulation sheet 23 downwards, causing the molten part to solidify on the upper surface of the lower positioning part 2111, thus achieving a fixed connection. Alternatively, laser welding can be performed on the outer periphery of the heat insulation sheet 23 to achieve a fixed connection with the upper periphery of the positioning groove 21111, which also achieves a sealing effect. Since the lower positioning part 2111 and the positioning groove 21111 are sealed, the sealing ring 22 can be completely placed on the heat insulation sheet 23 without contacting the lower positioning part 2111, thus achieving the best heat insulation effect.

[0052] Alternatively, without any welding or bonding, the heat insulation sheet 23 can be placed in the positioning groove 21111. After the sealing ring 22 is deformed downwards, a small portion will contact the lower positioning part 2111, while most of it will contact the heat insulation sheet 23. Thus, the sealing ring 22 will cover the gap between the outer peripheral wall of the heat insulation sheet 23 and the inner peripheral wall of the positioning groove 21111, thereby achieving a seal. It should be noted that because the contact area between the sealing ring 22 and the lower positioning part 2111 is small, less heat is conducted, and the safety requirements can be met in the short-circuit test.

[0053] Specifically, the pole piece 21 includes a lower part 211 and an upper part 212. Both the lower part 211 and the upper part 212 are integral parts formed by stamping. The lower positioning part 2111 is integrally formed on the lower part 211, and the upper part 212 is disposed on the upper side of the lower part 211. The upper part 212 and the lower part 211 are fixedly connected by welding or riveting. The upper positioning part 2121 is provided on the outer periphery of the upper part 212.

[0054] Therefore, when assembling the pole piece 21, the lower part 211 extends upward from below the mounting hole 111 and then the upper part 212 is fixedly connected to the lower part 211 by engaging downward, so that the lower positioning part 2111 is below the mounting hole 111 and the upper positioning part 2121 is above the mounting hole 111 to clamp and install the cover plate structure 1.

[0055] Specifically, the lower part 211 includes a cylindrical extension tube 2112 and a connecting top 2113 that covers the upper end of the extension tube 2112; the lower positioning part 2111 is annular and integrally formed on the lower outer periphery of the extension tube 2112; a second connecting surface 21131 is provided above the connecting top 2113; a mating protrusion 21211 is provided below the upper part 212, and a first connecting surface 21212 is provided below the mating protrusion 21211; the first connecting surface 21212 and the second connecting surface 21131 are fitted together; in addition, the connecting top 2113 is formed into a welding part 4 by upward laser penetration welding, and the welding part 4 forms a second weld layer 41 between the first connecting surface 21212 and the second connecting surface 21131.

[0056] In other embodiments, the lower part 211 and the upper part 212 are fixed by ultrasonic welding to form a first weld layer between the first connecting surface 21212 and the second connecting surface 21131.

[0057] Preferably, there are multiple welded parts 4, each welded part 4 is arranged in a ring, and each welded part 4 is arranged in a ring from the inside to the outside, so as to improve the stability of the connection between the upper part 212 and the lower part 211 through multiple ring welding.

[0058] In addition, the pole assembly 2 also includes a positioning member 24 disposed above the mounting hole 111, with the upper positioning part 2121, the positioning member 24 and the upper cover plate 11 arranged in sequence facing downwards and abutting each other.

[0059] The positioning member 24 has a first positioning protrusion 241 on its inner periphery that is inserted downward into the mounting hole 111. The outer periphery of the first positioning protrusion 241 is adapted to the shape and size of the inner periphery of the mounting hole 111, so that positioning is achieved through the cooperation of the outer periphery of the first positioning protrusion 241 and the inner periphery of the mounting hole 111, thereby improving assembly accuracy. The positioning member 24 also has a second positioning protrusion 242 on its outer periphery that is arranged upward around the outer periphery of the upper positioning part 2121. The inner periphery of the second positioning protrusion 242 is adapted to the shape and size of the outer periphery of the upper positioning part 2121, so that positioning is achieved through the cooperation of the inner periphery of the second positioning protrusion 242 and the outer periphery of the upper positioning part 2121, thereby improving assembly accuracy. The upper cover plate 11 is integrally formed facing upward and has a third positioning protrusion 112 that is arranged around the outer periphery of the positioning member 24. The inner circumferential shape and size of the third positioning protrusion 112 are adapted to the shape and size of the outer circumferential wall of the positioning member 24 so that positioning is performed by the cooperation of the inner circumferential wall of the third positioning protrusion 112 and the outer circumferential wall of the positioning member 24 to improve assembly accuracy.

[0060] In this embodiment, the upper part 212 and the lower part 211 of the positive electrode 31 are both made of aluminum, the upper part 212 of the negative electrode 32 is made of aluminum, and the lower part 211 of the negative electrode 32 is made of copper. This is to make the upper part 212 made of aluminum for easy external conductivity, while the lower part 211 of the positive electrode is made of aluminum and the lower part 211 of the negative electrode is made of copper to form a potential difference.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sealed ring thermal protection type battery top cover, characterized in that, The utility model relates to a cover plate structure (1) is provided with mounting hole (111) through on the cover plate structure (1), pole post assembly (2) is installed in mounting hole (111), pole post assembly (2) includes sealing ring (22), heat insulation sheet (23), positioning piece (24), pole post piece (21), sealing ring (22) is provided below mounting hole (111), heat insulation sheet (23) is provided below sealing ring (22), positioning piece (24) is provided above mounting hole (111), pole post piece (21) respectively passes sealing ring (22) and mounting hole (111), and pole post piece (21) is located below heat insulation sheet (23) and is provided with lower positioning part (2111), and is provided with upper positioning part (2121) above positioning piece (24), lower positioning part (2111), heat insulation sheet (23), sealing ring (22) and cover plate structure (1) are sequentially set up and resist upwards, upper positioning part (2121), positioning piece (24) and cover plate structure (1) are sequentially set up and resist downwards. The sealing ring (22) is made of fluorine rubber material; and / or, The heat insulation sheet (23) is made of carbon fiber material. The heat insulation sheet (23) is fixedly connected with the lower positioning part (2111) by downward laser penetration welding; or, The outer periphery of the heat insulation sheet (23) and the lower positioning part (2111) are fixedly connected by laser welding; or, The heat insulation sheet (23) and the lower positioning part (2111) are gluedly connected; or, The lower side of the sealing ring (22) only contacts the heat insulation sheet (23); or, The lower side of the sealing ring (22) partially contacts the heat insulation sheet (23) and partially contacts the lower positioning part (2111). The top of the lower positioning part (2111) is provided with a positioning groove (21111), and the heat insulation sheet (23) is at least partially positioned in the positioning groove (21111) to be positioned and installed; and / or, 2. The sealed gasketed thermal break top cover for a battery as set forth in claim 1, wherein: The heat insulation sheet (23) is annularly arranged to continuously contact the lower periphery of the sealing ring (22). The pole post piece (21) includes a lower part (211) and an upper part (212), the lower positioning part (2111) is arranged on the lower part (211), the upper part (212) is arranged on the upper side of the lower part (211), and the upper part (212) and the lower part (211) are fixedly connected by welding or riveting.

3. The sealed gasketed thermal break top cover for a battery as set forth in claim 1, wherein: The lower side of the upper part (212) is provided with a first connecting surface (21212), the upper side of the lower part (211) is provided with a second connecting surface (21131), and the first connecting surface (21212) and the second connecting surface (21131) are arranged in close contact. ​ ​ ​ ​ 4. The sealed gasketed thermal break top cover for a battery as set forth in claim 1, wherein: ​ ​ 5. The sealed gasketed thermal break top cover for a battery as set forth in claim 1, wherein: ​ 6. The sealed gasketed insulated protective battery terminal as described in claim 5, wherein: ​ The lower part (211) and the upper part (212) are welded by ultrasonic welding to form a first welding layer between the first connecting surface (21212) and the second connecting surface (21131), or the lower part (211) is formed by upward laser penetration welding to form a welding part (4), and the welding part (4) forms a second welding layer (41) between the first connecting surface (21212) and the second connecting surface (21131).

7. The sealed gasketed insulated protective battery terminal as described in claim 6, wherein: The number of the welding parts (4) is multiple, each of the welding parts (4) is arranged in a ring shape, and each of the welding parts (4) is arranged in a ring shape from inside to outside.

8. The sealed gasketed insulated protective battery terminal as described in claim 6, wherein: The lower part (211) includes an extension cylinder part (2112) in a cylindrical shape and a connecting top part (2113) capped on the upper end of the extension cylinder part (2112); The lower positioning part (2111) is in a ring shape and is arranged on the outer periphery of the lower end of the extension cylinder part (2112); The second connecting surface (21131) is arranged above the connecting top part (2113); The lower part (212) is provided with a matching convex part (21211) below, and the first connecting surface (21212) is arranged below the matching convex part (21211).

9. The sealed, insulated battery top cover of claim 5, wherein: The inner periphery of the positioning part (24) is provided with a first positioning convex part (241) inserted downward into the mounting hole (111), and the outer periphery of the positioning part (24) is provided with a second positioning convex part (242) arranged in a ring shape on the outer periphery of the upper part (212); The cover plate structure (1) is provided with a third positioning convex part (112) arranged in a ring shape on the outer periphery of the positioning part (24).

10. The sealed gasketed insulated protective battery terminal as described in claim 5, wherein: The pole assembly (2) is divided into a positive pole (31) and a negative pole (32), the upper part (212) and the lower part (211) of the positive pole (31) are made of aluminum material, the upper part (212) of the negative pole (32) is made of aluminum material, and the lower part (211) of the negative pole (32) is made of copper material.

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