A battery top cover assembly

Abstract

This utility model discloses a battery top cover assembly. The top cover body has a terminal post with a boss formed on it. A connecting strip matching the boss is installed on the terminal post, and a connecting hole matching the boss is formed on the connecting strip. A first gap for welding is formed between the outer wall of the boss and the connecting hole. The diameter of the connecting hole is a first diameter, and the diameter of the boss is a second diameter. The first diameter is smaller than the second diameter, and the second diameter is equal to the first diameter + 0 to 0.1 mm. The height of the boss is equal to the thickness of the connecting strip. Compared with the prior art, this utility model's battery top cover assembly completes the welding of the terminal post and connecting strip using low-power welding. This not only reduces welding costs but also improves welding quality, reduces welding difficulty, facilitates the compact structure and weight control of the battery top cover assembly, optimizes the overall design of the battery pack, and is more suitable for industrial production applications.

Description

Technical Field

[0001] This utility model belongs to the field of battery component technology, specifically relating to a top cover assembly for a battery. Background Technology

[0002] Currently, the terminals and busbars (multi-layer composite structure connecting strips) in lithium battery modules are typically fastened using bolts or laser-through welding. While these methods can ensure connection strength under certain conditions, they also have some significant drawbacks. Bolted connections, due to their high contact resistance, are prone to heat generation and aging at the connection points, affecting the long-term performance and safety of the battery. While laser-through welding provides good welding results, its application in industrial production is limited by the high cost and rapid energy decay rate of high-power lasers.

[0003] Furthermore, existing technical solutions still struggle to completely address the overall height issue of battery modules in terms of design. Traditional laser penetration welding technology, while achieving welding, often increases the overall height of the module due to the thickness of the Busbar sheet. This not only places higher demands on the actual space utilization in vehicle installation but may also affect the structural compactness and weight control of the module, hindering the overall design optimization of the battery pack.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a top cover assembly for a battery that can solve the technical problems mentioned in the background section.

[0006] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0007] A battery top cover assembly includes a top cover body, on which a terminal post is disposed, a boss is formed on the terminal post, a connecting row that matches the boss is mounted on the terminal post, a connecting hole that matches the boss is opened on the connecting row, and a first gap for welding is formed between the outer wall of the boss and the connecting hole.

[0008] In one or more embodiments of this utility model, the diameter of the connecting hole is a first diameter, the diameter of the boss is a second diameter, and the first diameter is smaller than the second diameter.

[0009] In one or more embodiments of this utility model, the second diameter is equal to the first diameter + 0 to 0.1 mm.

[0010] In one or more embodiments of this utility model, the height of the boss is equal to the thickness of the connecting bar.

[0011] In one or more embodiments of this utility model, the thickness of the connecting bar is 0.5 to 1.3 mm.

[0012] In one or more embodiments of this utility model, the thickness of the connecting bar is 0.8 to 1 mm.

[0013] In one or more embodiments of this utility model, the electrode post is an aluminum electrode post.

[0014] In one or more embodiments of this utility model, the electrode post is an aluminum electrode post.

[0015] In one or more embodiments of this utility model, the connecting bar is an aluminum connecting bar.

[0016] In one or more embodiments of this utility model, a plurality of protruding posts are fixedly connected to the connecting bar, and blind holes matching the protruding posts are opened on the pole posts.

[0017] Compared with the prior art, the battery top cover assembly of this utility model completes the welding of the terminal post and the connecting bar through low-power welding, which not only reduces the welding cost, but also helps to improve the welding quality, reduce the welding difficulty, facilitates the structural compactness and weight control of the battery top cover assembly, facilitates the overall design optimization of the battery pack, and is more conducive to its application in industrial production. Attached Figure Description

[0018] 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 recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a battery top cover assembly according to one embodiment of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of a battery top cover assembly according to one embodiment of the present invention. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the connecting row in one embodiment of the present invention.

[0022] Explanation of key figure labels:

[0023] 1. Top cover body; 2. Pole post; 201. Sinking groove; 3. Boss; 4. Connecting bar; 401. Connecting hole; 5. Blind hole; 6. Protruding post. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0025] like Figure 1 As shown, a top cover assembly of a battery according to one embodiment of the present invention includes a top cover body 1. Two terminals 2 are disposed on the top cover body 1, namely a positive terminal and a negative terminal. A recessed groove 201 is formed on the terminal 2, causing a protrusion 3 to form at the upper end of the terminal 2. A connecting strip 4 matching the protrusion 3 is installed on the terminal 2, and the connecting strip 4 is fixedly connected to the terminal 2 by welding.

[0026] Specifically, such as Figure 1 As shown, the connecting strip 4 has a connecting hole 401, which matches the boss 3. Generally, the connecting strip 4 has a connecting hole 401 that matches the boss 3, and a first gap for welding is formed between the outer wall of the boss 3 and the connecting hole 401. Welding between the boss 3 and the connecting strip 4 is completed along the first gap, achieving continuous welding around the entire circumference. The weld seam is generally between 0.5 and 1.5 mm.

[0027] Furthermore, such as Figure 1 As shown, the diameter of the connecting hole 401 is the first diameter, and the diameter of the boss 3 is the second diameter. The first diameter is smaller than the second diameter. Generally, the second diameter is equal to the first diameter + 0 to 0.1 mm. In other words, the formula for calculating the second diameter is: Second diameter = First diameter + 0 to 0.1 mm.

[0028] In a preferred embodiment, the second diameter is equal to the first diameter + 0.05 mm.

[0029] like Figure 1As shown, the height of the boss 3 is equal to the thickness of the connecting strip 4, meaning that after the boss 3 and the connecting strip 4 are welded, the upper surface of the boss 3 and the upper surface of the connecting strip 4 are on the same horizontal plane. Generally, the thickness of the connecting strip 4 is 0.5–1.3 mm, and preferably 0.8–1 mm. This not only reduces the power required for welding but also facilitates improved welding yield. Furthermore, the reduced thickness of the connecting strip 4 lowers its material cost. During welding, it also reduces spatter in the molten pool, simplifying subsequent cleaning.

[0030] Both pole post 2 and connecting strip 4 are made of aluminum.

[0031] like Figures 2-3 As shown, multiple protruding posts 6 are fixedly connected to the connecting strip 4, and blind holes 5 matching the protruding posts 6 are opened on the pole post 2. The connection strip 4 and the blind holes 5 can be used to complete the splicing of the boss 3 and the connecting strip 4, so that the boss 3 and the connecting strip 4 are always in the same direction, reducing the need for manual positioning and reducing manual labor.

[0032] Generally, in order to ensure that the configuration of the connecting strip 4 and the blind hole 5 does not affect the normal use of the top cover assembly, the outer wall of the connecting strip 4 and the inner wall of the blind hole 5 should fit tightly together, so as to avoid the situation where the battery current is affected due to the non-fitting inner walls of the connecting strip 4 and the blind hole 5.

[0033] When assembling the top cover assembly of the battery, the connecting strip 4 is inserted into the boss 3 through the connecting hole 401 to make the connecting strip 4 and the boss 3 match. The orientation of the connecting strip 4 is adjusted, and then the connecting strip 4 and the boss 3 are welded together along the first gap formed between the connecting strip 4 and the boss 3.

[0034] Because of the presence of blind holes 5 and protruding posts 6, the upper surface of the connecting strip 4 and the upper surface of the boss 3 will not be on the same horizontal line when blind holes 5 and protruding posts 6 are not aligned. Therefore, the welding of the pole post 2 and the boss 3 can only be achieved after the blind holes 5 and protruding posts 6 are aligned. In this way, the welding quality of blind holes 5 and protruding posts 6 can be guaranteed, and the situation of quality being affected and efficiency being reduced due to misalignment of blind holes 5 and protruding posts 6 can be avoided as much as possible.

[0035] In this embodiment, by welding the boss 3 to the connecting strip 4, the connection method between the pole post 2 and the connecting strip 4 can be effectively adjusted, the welding power can be reduced, and the possibility of damage to the pole post 2 or the connecting strip 4 due to excessive welding power can be reduced, which is conducive to improving the welding quality.

[0036] In another embodiment, a cylindrical boss 3 with a diameter of 8 mm and a height of 1.2 mm is machined at the top of the pole post 2. Then, a connecting strip 4 with a thickness of 1 mm is selected, and an 8.05 mm connecting hole 401 is punched into the connecting strip 4. The connecting strip 4 is then fitted onto the boss 3 through the connecting hole 401. Then, a 500W fiber laser is used to perform continuous circumferential welding along the first gap. The welding parameters are: power 400W, speed 15 mm / s, defocusing amount +2 mm, forming a continuous weld seam with a width of 1.0 mm. In this way, while ensuring connection strength and reliability, the production cost of the top cover assembly can be reduced without affecting the compactness of the module and the safety performance of the battery.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A top cover assembly of a battery, characterized by comprising: Includes a top cover, on which a pole post is provided, on which a boss is formed, and on which a connecting bar that matches the boss is installed; The connecting bar has a connecting hole that matches the boss, and a first gap for welding is formed between the outer wall of the boss and the connecting hole.

2. The battery top cover assembly of claim 1, wherein, The diameter of the connecting hole is a first diameter, and the diameter of the boss is a second diameter, wherein the first diameter is smaller than the second diameter.

3. The battery top cover assembly of claim 2, wherein, The second diameter is equal to the first diameter + 0 to 0.1 mm.

4. The battery top cover assembly of claim 1, wherein, The height of the boss is equal to the thickness of the connecting strip.

5. The battery top cover assembly according to claim 1 or 4, wherein The thickness of the connecting bar is 0.5 to 1.3 mm.

6. The battery top cover assembly of claim 1, wherein, The thickness of the connecting bar is 0.8 to 1 mm.

7. The battery top cover assembly according to claim 1 or 6, wherein The electrode post is an aluminum electrode post.

8. The battery top cover assembly of claim 1, wherein, The electrode post is an aluminum electrode post.

9. The battery top cover assembly of claim 1 or 8, wherein, The connecting bar is an aluminum connecting bar.

10. The battery top cover assembly of claim 1, wherein, Multiple protruding posts are fixedly connected to the connecting bar, and blind holes matching the protruding posts are opened on the pole posts.

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