A winding core and cover plate connecting structure and a lithium ion battery

Abstract

This utility model discloses a connection structure between a core and a cover plate, and a lithium-ion battery, comprising: a core having tabs; a cover plate disposed on the core; and a connecting post disposed on the tabs. The outer side of the connecting post is connected to the cover plate via an insulating component. A fastener is threadedly connected to the end of the connecting post away from the core. During cell assembly, rotating the fastener drives the insulating component, along with the cover plate, to move towards the tab, thereby connecting the tab to the connecting post. This utility model has a simple structure. By rotating the fastener at the end of the connecting post, the fastener squeezes the insulating component, causing the space between the insulating component and the connecting post for fixing the tab to gradually decrease, thus clamping the tab and achieving a reliable connection between the connecting post and the tab. This avoids the impact of welding slag and dust generated by laser welding in traditional manufacturing processes on product performance. Furthermore, eliminating the laser welding process also helps reduce production costs.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, specifically a connection structure between a core and a cover plate, and a lithium-ion battery. Background Technology

[0002] With the rapid development of the new energy industry, lithium-ion batteries, as a key energy storage device, are playing an increasingly important role in daily life and industrial applications. Especially with strong government support, the new energy vehicle industry has ushered in unprecedented development opportunities, placing higher demands on the safety, stability, and lifespan of lithium-ion batteries. However, traditional lithium-ion battery manufacturing processes face numerous challenges in ensuring these performance characteristics.

[0003] Specifically, in conventional laser welding processes, the welding of the connecting piece and the electrode post easily generates dust and welding slag. These byproducts not only affect the quality of the weld joint and reduce the reliability of the electrical connection, but also easily cause internal contamination during core merging and casing encapsulation, leading to battery performance degradation or even failure. Furthermore, the high temperatures generated during laser welding can cause thermal damage to the electrode tab tape inside the core, forming so-called "welding bursts," further increasing the product scrap rate and severely impacting production efficiency and cost control. Therefore, a connection structure between the core and the cover plate, and a lithium-ion battery, are proposed. Utility Model Content

[0004] The purpose of this invention is to provide a connection structure between the core and the cover plate, and a lithium-ion battery, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a connection structure between a core and a cover plate, comprising:

[0006] The core has pole tabs;

[0007] A cover plate is disposed on the winding core; and

[0008] A connecting post is provided on the electrode tab. The outer side of the connecting post is connected to the cover plate through an insulating component. The end of the connecting post away from the core is threaded with a fastener. When assembling the battery cell, rotating the fastener drives the insulating component and the cover plate to move toward the electrode tab, thereby connecting the electrode tab and the connecting post.

[0009] By rotating the fasteners at the ends of the connecting columns, the core and the cover plate are connected, avoiding the impact of welding slag and dust generated by laser welding in the traditional manufacturing process on product performance. At the same time, the laser welding process of the cover plate is eliminated, thereby reducing the occurrence of abnormalities such as poor cell welding and short circuits, and further reducing production costs.

[0010] As a further embodiment of this utility model: the insulating component is made of plastic material through injection molding process, which facilitates the tight connection between the electrode and the connecting post, while taking into account both insulation performance and airtightness.

[0011] As a further embodiment of this utility model: the end of the connecting post away from the core has an external thread, and the external thread on the connecting post is adapted to the internal thread on the fastener, so as to ensure that the fastener can rotate smoothly on the connecting post and achieve the fastening function.

[0012] As a further embodiment of this utility model, the fastener is a nut.

[0013] As a further embodiment of this utility model, the cover plate is made of aluminum.

[0014] As a further embodiment of this utility model: the connecting post includes an integrally formed vertical part and a horizontal part, the vertical part is located on the upper surface of the horizontal part, the upper surface of the electrode lug is provided with a through groove, and the vertical part is located inside the through groove.

[0015] The vertical part passes through the slot on the electrode tab, and the lower surface of the electrode tab contacts the upper surface of the horizontal part, which can provide initial stability between the connecting post and the electrode tab.

[0016] This utility model also proposes a lithium-ion battery, which includes a connection structure between a core and a cover plate, wherein the connection structure between the core and the cover plate adopts the connection structure between the core and the cover plate as described above.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This application uses a rotating fastener at the end of the connecting post to compress the insulating component, causing the space between the insulating component and the connecting post for fixing the electrode tab to gradually shrink, thereby clamping the electrode tab and achieving a reliable connection between the connecting post and the electrode tab. This avoids the impact of welding slag and dust generated by laser welding in the traditional manufacturing process on product performance. At the same time, eliminating the laser welding process also helps to reduce production costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the combination of the core and cover plate of this utility model;

[0020] Figure 2 This is a schematic diagram showing the disassembly of the core and cover plate of this utility model;

[0021] Figure 3 This is a side view of the core and cover plate of this utility model;

[0022] Figure 4 This is a schematic diagram showing the disassembled connection structure of this utility model;

[0023] Figure 5 This is a top view of the electrode lug and connecting post of this utility model;

[0024] In the diagram: 1. Core; 2. Pole tab; 3. Connecting post; 4. Cover plate; 5. Insulating component; 6. Fastener. Detailed Implementation

[0025] 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.

[0026] Please see Figure 1-5 In this embodiment of the utility model, a connection structure between a core and a cover plate includes:

[0027] Core 1, with tabs 2;

[0028] Cover plate 4, disposed on core 1; and

[0029] A connecting post 3 is disposed on the electrode tab 2. The outer side of the connecting post 3 is connected to the cover plate 4 through an insulating member 5. The end of the connecting post 3 away from the core 1 is threaded with a fastener 6. When assembling the battery cell, rotating the fastener 6 drives the insulating member 5 to move the cover plate 4 toward the electrode tab 2, thereby connecting the electrode tab 2 and the connecting post 3.

[0030] Specifically, the upper end face of the core 1 is provided with two tabs 2, which are positive and negative tabs respectively, and a connecting post 3 is provided on the end face of each tab 2. The two connecting posts 3 are positive and negative connecting posts respectively. The positive and negative tabs correspond one-to-one with the positive and negative connecting posts to ensure good electrical connection and mechanical stability, so as to ensure that the current can be transmitted efficiently and reliably. The cover plate 4 is made of aluminum, and an insulating part 5 is made between the connecting post 3 and the cover plate 4 using an injection molding process, so that the connecting post 3, the cover plate 4 and the insulating part 5 form an integral structure. Then, by rotating the fastener 6 located at the end of the connecting post 3, the fastener 6 presses the cover plate 4 and the insulating part 5, making the connection between the two and the connecting post 3 tighter.

[0031] Through the above technical solution, by rotating the fastener 6 at the end of the connecting post 3, the fastener 6 squeezes the insulating part 5, causing the space between the insulating part 5 and the connecting post 3 for fixing the electrode 2 to gradually shrink, thereby clamping and fixing the electrode 2, realizing a reliable connection between the connecting post 3 and the electrode 2, and finally completing the connection between the core 1 and the cover plate 4. This design avoids the impact of welding slag and dust generated by laser welding in the traditional manufacturing process on product performance, and at the same time eliminates the laser welding process of the cover plate 4, thereby reducing the occurrence of abnormal situations such as poor cell welding and short circuits, and further reducing production costs.

[0032] Please see Figure 1 In one embodiment, preferably, the insulating component 5 is made of plastic material through injection molding, which has both insulation properties and airtightness, and can effectively ensure the sealing of the battery cell.

[0033] Please see Figure 1 In one embodiment, preferably, the end of the connecting post 3 away from the core 1 has an external thread, and the external thread on the connecting post 3 is adapted to the internal thread on the fastener 6. The fastener 6 is a nut, which is designed to facilitate the insertion of the end of the connecting post 3 into it, thereby ensuring that the nut can rotate smoothly on the connecting post 3 and achieve the fastening function.

[0034] Please see Figure 4 In one embodiment, preferably, the connecting post 3 includes an integrally formed vertical part and a horizontal part. The vertical part is located on the upper surface of the horizontal part. The upper surface of the electrode tab 2 is provided with a through groove, and the vertical part is located inside the through groove. By inserting the vertical part of the connecting post 3 into the through groove, the position between the electrode tab 2 and the connecting post 3 can be initially defined. Then, by rotating the fastener 6, the upper part of the electrode tab 2 on the horizontal part is pressed and fixed by the insulating member 5. The horizontal part and the insulating member 5 achieve clamping and fixing of the upper and lower surfaces of the electrode tab 2, so as to achieve a stable connection between the connecting post 3 and the electrode tab 2.

[0035] This utility model also proposes a lithium-ion battery, which includes a connection structure between a core and a cover plate.

[0036] 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. 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.

[0037] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A connection structure between a core and a cover plate, characterized in that, include: The winding core has pole tabs; A cover plate is disposed on the winding core; as well as A connecting post is provided on the electrode tab. The outer side of the connecting post is connected to the cover plate through an insulating component. The end of the connecting post away from the core is threaded with a fastener. When assembling the battery cell, rotating the fastener drives the insulating component and the cover plate to move toward the electrode tab, thereby connecting the electrode tab and the connecting post.

2. The connection structure of the core and the cover plate according to claim 1, characterized by The insulating component is made of plastic material through an injection molding process.

3. The connection structure of the core and the cover plate according to claim 1, characterized by The end of the connecting post away from the core has an external thread, and the external thread on the connecting post is adapted to the internal thread on the fastener.

4. The connection structure of the core and the cover plate according to claim 3, characterized by The fastener is a nut.

5. The connection structure of the core and the cover plate according to claim 1, wherein The cover plate is made of aluminum.

6. The connection structure of the core and the cover plate according to claim 1, wherein The connecting post includes an integrally formed vertical part and a horizontal part. The vertical part is located on the upper surface of the horizontal part. A through groove is formed on the upper surface of the electrode tab, and the vertical part is located inside the through groove.

7. A lithium ion battery comprising a connection structure of a jelly-roll and a cover plate, characterized by, The connection structure between the core and the cover plate adopts the connection structure between the core and the cover plate as described in any one of claims 1-6.

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