Top cover assembly and battery

Abstract

The utility model discloses a top cover assembly and a battery, the top cover assembly comprises a pole, a sealing piece, a lower insulating piece, a top cover piece, a conductive piece, an upper insulating piece and a connecting piece, and the connecting piece and the pole are integrally formed; in the assembling process of the top cover assembly, the sealing piece is arranged outside the pole in a sleeving mode, the pole penetrates through the lower insulating piece and the top cover piece, the top cover piece and the connecting piece are matched to press the lower insulating piece, the conductive piece is arranged on the pole in a sleeving mode, and the upper insulating piece is arranged between the conductive piece and the top cover piece. The connecting sheets and the poles are integrally formed, so that the welding step is omitted, infirm welding is avoided, and the assembling procedures of the top cover assembly are reduced; in the assembling process, the sealing piece is arranged outside the pole in a sleeving mode, the connecting piece further plays a role in supporting and positioning the sealing piece, follow-up assembling is facilitated, assembling is easy, and production efficiency is high.

Description

Technical Field

[0001] This utility model relates to the technical field of power batteries and energy storage batteries, and more specifically, to a top cover assembly and a battery. Background Technology

[0002] Lithium-ion batteries are widely used in power batteries, energy storage batteries, and other technological fields. Power batteries provide power for tools, typically powering electric vehicles, electric trains, electric bicycles, golf carts, and other similar vehicles, and are core components of new energy vehicles. Energy storage batteries are commonly used in home energy storage, power stations for solar and wind power generation equipment, portable power supplies, communication base stations, and as batteries for storing renewable energy. The two types of batteries have different application scenarios, and their performance and design differ.

[0003] Lithium batteries consist of a casing, a top cover assembly, and battery cells. The battery cells are housed inside the casing, which has an opening at the top. The top cover assembly typically includes an upper plastic part, a top cover sheet, a lower plastic part, a sealing ring, electrode posts, and electrical connectors. The top cover sheet seals the opening at the top of the casing, and the electrode posts pass through the top cover sheet and connect to the battery cells inside the casing via the electrical connectors to supply power to the outside. However, in existing technologies, the electrical connectors need to be fixed to the electrode posts by welding, increasing the assembly process of the top cover assembly, resulting in slower production efficiency. Furthermore, weak welding can easily lead to open circuits in the battery. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned defects in the existing technology and provide a top cover assembly, including:

[0005] pole;

[0006] A sealing element, wherein the sealing element is sleeved outside the pole post;

[0007] Lower insulation component;

[0008] A top cover sheet, the inner surface of which abuts against the lower insulating member, the pole penetrating the lower insulating member and the top cover sheet, and the sealing member located between the top cover sheet and the pole.

[0009] A conductive element is disposed on the outside of the top cover plate and sleeved on the pole post;

[0010] Upper insulating member, the upper insulating member being disposed between the conductive member and the top cover plate; and

[0011] A connecting piece is integrally formed with the pole post; the top cover plate cooperates with the connecting piece to press the lower insulating component.

[0012] This utility model also provides a battery, which includes the above-described top cover assembly.

[0013] Implementing the embodiments of this utility model will have the following beneficial effects:

[0014] This utility model provides a top cover assembly and a battery. The top cover assembly includes a terminal post, a sealing element, a lower insulating element, a top cover sheet, a conductive element, an upper insulating element, and a connecting piece. The connecting piece is integrally formed with the terminal post. During assembly, the sealing element is fitted over the terminal post, the terminal post passes through the lower insulating element and the top cover sheet, the top cover sheet and the connecting piece cooperate to press the lower insulating element together, the conductive element is fitted onto the terminal post, and the upper insulating element is positioned between the conductive element and the top cover sheet. The integral formation of the connecting piece with the terminal post eliminates the welding step, avoids weak welds, and reduces the assembly steps of the top cover assembly. During assembly, the sealing element fitted over the terminal post, and the connecting piece also provides support and positioning for the sealing element, facilitating subsequent assembly. Assembly is simple and production efficiency is high. Attached Figure Description

[0015] 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.

[0016] in:

[0017] Figure 1 A schematic diagram of the top cover assembly provided by this utility model;

[0018] Figure 2 for Figure 1 A cross-sectional view along the N-N' direction;

[0019] Figure 3 for Figure 2 An enlarged schematic diagram of region A in the middle;

[0020] Figure 4 An exploded view of the top cover assembly provided by this utility model;

[0021] Figure 5 Another schematic diagram of the pole post in the top cover assembly provided by this utility model;

[0022] Figure 6 Another schematic diagram of the pole post in the top cover assembly provided by this utility model;

[0023] Figure 7 for Figure 1 A cross-sectional view along the N-N' direction;

[0024] Figure 8 for Figure 7 An enlarged schematic diagram of region B in the middle;

[0025] Figure 9 This is another schematic diagram of the top cover assembly provided by this utility model. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Reference Figures 1-4 This utility model discloses a top cover assembly, including: a pole post 1, a sealing element 2, a lower insulating element 3, a top cover plate 4, a conductive element 5, an upper insulating element 6, and a connecting piece 7.

[0028] The inner surface of the top cover plate 4 abuts against the lower insulating member 3. The pole post 1 passes through the lower insulating member 3 and the top cover plate 4. The sealing member 2 is sleeved on the outside of the pole post 1 and is located between the top cover plate 4 and the pole post 1. The conductive member 5 is disposed on the outside of the top cover plate 4 and is sleeved on the pole post 1. The upper insulating member 6 is disposed between the conductive member 5 and the top cover plate 4. The connecting piece 7 is integrally formed with the pole post 1, and the top cover plate 4 and the connecting piece 7 cooperate to press the lower insulating member 3.

[0029] It is understood that in this embodiment, the connecting piece 7 and the pole post 1 are integrally formed, eliminating the welding step, avoiding weak welding, and reducing the assembly process of the top cover assembly; during the assembly process, the sealing element 2 is sleeved on the outside of the pole post 1, and the connecting piece 7 also plays a supporting and positioning role for the sealing element 2, which facilitates subsequent assembly, making the assembly simple and the production efficiency high.

[0030] In one specific embodiment, reference is made to Figures 1-4 The sealing element 2 and the top cover plate 4 are respectively provided with a first positioning structure 10, and the sealing element 2 and the top cover plate 4 are engaged and positioned by the first positioning structure 10.

[0031] The top cover plate 4 and the lower insulating member 3 are respectively provided with a second positioning structure 20, and the top cover plate 4 and the lower insulating member 3 are engaged and positioned by the second positioning structure 20.

[0032] The conductive element 5 and the pole post 1 are respectively provided with a third positioning structure 30, and the conductive element 5 and the pole post 1 are positioned by the third positioning structure 30.

[0033] In this embodiment, the top cover assembly is assembled as follows:

[0034] (1) First, put the sealing element 2 on the pole 1;

[0035] (2) Pass the pole 1 with the sealing element 2 through the lower insulating element 3 and the top cover plate 4 in sequence;

[0036] First, assemble the top cover plate 4 and the lower insulating component 3. The top cover plate 4 and the lower insulating component 3 are respectively provided with a second positioning structure 20. The second positioning structure 20 positions the top cover plate 4 and the lower insulating component 3 during assembly. When the top cover plate 4 and the lower insulating component 3 are engaged by the second positioning structure 20, it indicates that the top cover plate 4 and the lower insulating component 3 have been accurately assembled, thus avoiding the subsequent assembly of the sealing component 2 and the pole post 1 due to deviations in the assembly position of the lower insulating component 3 and the top cover plate 4.

[0037] Then, the pole 1 with the sealing element 2 is passed through the lower insulating element 3 and the top cover plate 4 in sequence. Since the sealing element 2 and the top cover plate 4 are respectively provided with the first positioning structure 10, when the pole 1 with the sealing element 2 is passed through the top cover plate 4, the top cover plate 4 positions the sealing element 2 axially through the first positioning structure 10. When the sealing element 2 and the top cover plate 4 are engaged by the first positioning structure 10, it means that the sealing element 2 and the pole 1 have been accurately assembled, thus avoiding damage to the parts due to inaccurate assembly position during assembly.

[0038] (3) The conductive component 5 is sleeved on the terminal post 1. A third positioning structure 30 is provided on the conductive component 5 and the terminal post 1 respectively. The third positioning structure 30 positions the conductive component 5 and the terminal post 1 during assembly. When the conductive component 5 and the terminal post 1 are engaged by the third positioning structure 30, it indicates that the conductive component 5 and the terminal post 1 have been accurately assembled. After assembling the conductive component 5, there is a gap between the conductive component 5 and the top cover plate 4 to avoid short circuit caused by direct contact between the conductive component 5 and the top cover plate 4 due to inaccurate positioning during assembly.

[0039] (4) An upper insulating member 6 is formed between the conductive member 5 and the top cover plate 4. The upper insulating member 6 may be a structural member formed by injection molding.

[0040] Understandably, during the assembly of the top cover assembly, the installation positions of the top cover plate 4 and the lower insulating component 3 are first positioned, and the top cover plate 4 and the lower insulating component 3 are engaged and positioned by the second positioning structure 20; then, the installation positions of the top cover plate 4 and the sealing component 2 are positioned, and after the pole post 1 with the sealing ring passes through the lower insulating component 3 and the top cover plate 4, the sealing component 2 and the top cover plate 4 are engaged and positioned by the first positioning structure 10; next, the installation positions of the conductive component 5 and the pole post 1 are positioned, and the conductive component 5 and the pole post 1 are engaged and positioned by the third positioning structure 30; finally, the upper insulating component 6 is formed between the conductive component 5 and the top cover plate 4. The top cover assembly allows for accurate positioning of all components during assembly, resulting in simple assembly, high production efficiency, and high product quality consistency.

[0041] Specifically, in this embodiment, the sealing element 2 can be a sealing ring, which is located below the top cover plate 4 to ensure that the battery has good sealing performance, effectively prevent electrolyte leakage, and provide a good sealed environment for the internal reaction of the battery.

[0042] After assembly, the top cover plate 4 serves as insulation, preventing short circuits between it and external wiring. Once the power battery is assembled, the top cover plate 4 isolates the internal battery cells or modules from the external environment, ensuring the safe operation of the battery system.

[0043] The lower insulating component 3 can be made of materials such as silicone rubber or styrene-butadiene rubber. These materials have good corrosion resistance and sealing properties, which can effectively prevent battery liquid leakage. They are also dustproof and waterproof, effectively preventing these external factors from affecting the battery and ensuring the normal operation of the battery.

[0044] The conductive component 5 can be a metal block capable of conducting electricity. The conductive component 5 can also be provided with a receiving groove 53, which can accommodate the material molten during the welding process between the conductive component 5 and the pole post 1, compensate for the welding excess height, reduce the influence of the weld height on the size of the top cover assembly, increase the welding area, improve the welding strength, and improve the welding quality of the top cover assembly.

[0045] The upper insulating component 6 can be injection molded from engineering plastics, possessing excellent waterproof and dustproof properties. The upper insulating component 6 is positioned between the conductive component 5 and the top cover plate 4, further preventing direct contact between the conductive component 5 and the top cover plate 4 that could cause a short circuit. Furthermore, the edge of the upper insulating component 6 is also provided with a protrusion 61 protruding away from the top cover plate 4. The protrusion 61 fits against the conductive component 5, further limiting the conductive component 5 and preventing it from becoming loose.

[0046] In one specific embodiment, reference continues to be made to... Figures 1-4 The top cover plate 4 is provided with a first pole mounting hole 41, the side wall of the first pole mounting hole 41 is provided with a first settling hole 42, the outer wall of the sealing member 2 is provided with a first engaging part 21, the first engaging part 21 and the first settling hole 42 engage and cooperate to form a first positioning structure 10.

[0047] Furthermore, the side wall of the first settling hole 42 is provided with a second settling hole 43, the lower insulating member 3 is provided with a second pole mounting hole 31, the side wall of the second pole mounting hole 31 is provided with a second engaging part 32, and the second engaging part 32 engages with the second settling hole 43 to form a second positioning structure 20.

[0048] Furthermore, the end of the pole post 1 is provided with a settling step 11, and the conductive element 5 is sleeved on the settling step 11, forming a third positioning structure 30.

[0049] In this embodiment, the top cover assembly is assembled as follows:

[0050] (1) First, put the sealing element 2 on the pole 1;

[0051] (2) Pass the pole 1 with the sealing element 2 through the lower insulating element 3 and the top cover plate 4 in sequence;

[0052] First, assemble the top cover plate 4 and the lower insulating component 3. Position the assembly of the top cover plate 4 and the lower insulating component 3 by engaging the second sink hole 43 of the top cover plate 4 with the second engaging part 32 of the lower insulating component 3.

[0053] Then, the pole 1 with the sealing element 2 is passed through the second pole mounting hole 31 of the lower insulating element 3 and the first pole mounting hole 41 of the top cover plate 4 in sequence. The assembly of the pole 1 with the sealing element 2 and the top cover plate 4 is positioned by engaging the first sink hole 42 of the top cover plate 4 with the first engaging part 21 of the sealing element 2.

[0054] (3) The conductive component 5 is fitted onto the settling step 11 of the pole post 1, and the settling step 11 positions the conductive component 5 and the pole post 1 for assembly.

[0055] (4) After assembling the conductive component 5, there is a gap between the conductive component 5 and the top cover plate 4. An upper insulating component 6 is formed by injection molding between the conductive component 5 and the top cover plate 4.

[0056] Understandably, during the assembly of the top cover assembly, the installation positions of the top cover plate 4 and the lower insulating component 3 are first positioned. The top cover plate 4 and the lower insulating component 3 are engaged and positioned through the second settling hole 43 and the lower second engaging part 32, respectively. Then, the installation positions of the top cover plate 4 and the sealing component 2 are positioned. After the pole post 1 with the sealing ring passes through the lower insulating component 3 and the top cover plate 4, the sealing component 2 and the top cover plate 4 are engaged and positioned through the first settling hole 42 and the first engaging part 21, respectively. Next, the installation positions of the conductive component 5 and the pole post 1 are positioned. The conductive component 5 and the pole post 1 are engaged and positioned through the settling step 11. Finally, the upper insulating component 6 is formed between the conductive component 5 and the top cover plate 4. The top cover assembly allows for accurate positioning of all components during assembly, resulting in simple assembly, high production efficiency, and high product quality consistency.

[0057] In one specific embodiment, reference is made to Figure 4 , Figures 6-8 The side wall of the pole post 1 is provided with a groove 12 that is recessed in the radial direction of the pole post 1. The conductive component 5 is provided with an assembly hole 51 for fitting onto the pole post 1. The inner wall of the assembly hole 51 is provided with a protrusion 52 that protrudes into the groove 12. The protrusion 52 is engaged with the groove 12.

[0058] During the assembly of the conductive component 5, the electrode post 1 passes through the assembly hole 51 and presses down on the conductive component 5, causing the protrusion 52 of the conductive component 5 to engage with the groove 12 of the electrode post 1. This engagement between the protrusion 52 and the groove 12 prevents displacement of the electrode post 1 or the conductive block along the axial direction of the electrode post 1. Furthermore, the groove 12 consists of multiple grooves 12 arranged along the circumference of the electrode post 1. The engagement between the protrusion 52 and the groove 12 further prevents rotation of the electrode post 1 or the conductive block, improving the stability of the assembly of the electrode post 1 and the conductive component 5.

[0059] In one specific embodiment, reference is made to Figure 3 The pole post 1 and the connecting piece 7 are integrally formed. The connecting piece 7 includes a pressing part 71 and a conductive part 72. The pressing part 71 extends outward from the end edge of the pole post 1, and the conductive part 72 extends outward from the edge of the pressing part 71. The pressing part 14 is located on the side of the seal 2 away from the top cover plate 4. The pressing part 14 is used to press the seal 2 along the axial direction of the pole post 1, and the conductive part 72 is used to connect the electrode tab.

[0060] Optional, refer to Figure 4 The connecting piece 7 is parallel to the plane containing the top cover piece 4, or, refer to... Figure 9 The connecting piece 7 includes a bent portion 74, which intersects with the plane of the top cover piece 4. That is to say, when the conductive part 72 is bent at an angle, the conductive part 72, which is also the bent portion 74, makes the bent portion 74 form an angle with the pressing part 71. The position of the bent portion 74 can be adjusted according to actual needs.

[0061] Furthermore, referring to Figure 5 The conductive part 72 also includes a subtractive part 73, which can be formed by subtracting material along the thickness direction and / or length direction and / or width direction of the conductive part 72. In case of battery failure, the subtractive part 73 melts, providing protection. The subtractive part 73 has insulating adhesive to prevent secondary contact and potential damage after the subtractive part 73 melts.

[0062] Furthermore, referring to Figure 3 The thickness of the pressing part 71 is greater than or equal to the thickness of the conductive part 72. During the assembly of the top cover assembly, the pressing part 71 plays the role of compressing the sealing element 2, so that the pressing part 71 has a certain strength and can continuously press the sealing element 2 to achieve the required strength for compression.

[0063] Furthermore, referring to Figure 3 The interior of the electrode post 1 is a cavity 13, with the opening of the cavity 13 facing the end of the electrode post 1 away from the conductive element 5. The cavity 13 reduces the weight of the electrode post 1 and saves costs. The electrode post 1 needs to have the ability to withstand overcurrent, requiring a certain thickness. The top of the electrode post 1 not only bears the overcurrent capacity requirement but also the strength requirement for welding with the conductive block. Therefore, the thickness of the top of the electrode post 1 must be greater than or equal to the wall thickness of the electrode post 1, greater than or equal to the thickness of the clamping part 71, and greater than or equal to the thickness of the conductive part 72.

[0064] Furthermore, the pole post 1, the clamping part 71, and the conductive part 72 are integrally formed. By integrally forming the pole post 1, the clamping part 71, and the conductive part 72, the assembly steps of the top cover assembly are reduced, making the top cover assembly easier to install and improving installation efficiency.

[0065] A battery comprising the top cover assembly described in any of the above embodiments.

[0066] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A top cover assembly, characterized in that, include: pole; A sealing element, wherein the sealing element is sleeved outside the pole post; Lower insulation component; A top cover sheet, the inner surface of which abuts against the lower insulating member, the pole penetrating the lower insulating member and the top cover sheet, and the sealing member located between the top cover sheet and the pole. A conductive element is disposed on the outside of the top cover plate and sleeved on the pole post; An upper insulating member is disposed between the conductive member and the top cover plate; as well as A connecting piece is integrally formed with the pole post; the top cover plate cooperates with the connecting piece to press the lower insulating component.

2. The top cover assembly according to claim 1, characterized in that, The sealing element and the top cover plate are respectively provided with a first positioning structure, and the sealing element and the top cover plate are engaged and positioned by the first positioning structure; The top cover and the lower insulating member are respectively provided with a second positioning structure, and the top cover and the lower insulating member are engaged and positioned by the second positioning structure; The conductive element and the electrode post are respectively provided with a third positioning structure, and the conductive element and the electrode post are positioned by the third positioning structure.

3. The top cover assembly according to claim 2, characterized in that, The top cover plate is provided with a first pole post mounting hole, and the side wall of the first pole post mounting hole is provided with a first settlement hole. The outer wall of the seal is provided with a first engaging portion. The first engaging part engages with the first settling hole to form the first positioning structure.

4. The top cover assembly according to claim 3, characterized in that, A second settlement hole is provided on the side wall of the first settlement hole. The lower insulating component is provided with a second pole mounting hole, and the side wall of the second pole mounting hole is provided with a second engaging portion. The second engaging part engages with the second settling hole to form the second positioning structure.

5. The top cover assembly according to claim 4, characterized in that, The end of the pole is provided with a settling step. The conductive component is sleeved on the settling step, and the settling step forms the third positioning structure.

6. The top cover assembly according to claim 5, characterized in that, The side wall of the electrode post is provided with a groove recessed in the radial direction of the electrode post, and the conductive component is provided with an assembly hole for fitting onto the electrode post. The inner wall of the assembly hole is provided with a protrusion protruding into the groove, and the protrusion engages with the groove.

7. The top cover assembly according to claim 1, characterized in that, The electrode post has a cavity inside, and the opening of the cavity faces the end of the electrode post away from the conductive element.

8. The top cover assembly according to claim 1 or 7, characterized in that, The connecting piece is provided with a material reduction section; The connecting piece is parallel to the plane of the top cover piece, or the connecting piece includes a bent portion that intersects the plane of the top cover piece.

9. The top cover assembly according to claim 1, characterized in that, The upper insulating component is a structural component formed by injection molding.

10. A battery, characterized in that, Includes the top cover assembly as described in any one of claims 1-9.

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