A conductive connecting piece between a high-capacity battery pole and a tab and a pole structure

Abstract

The application relates to a conductive connecting sheet and a pole structure of a large-capacity battery. The conductive connecting sheet comprises a plurality of conductive metal connecting sheets with different lengths, which can be folded after being welded. The pole structure comprises a pole and the aforementioned conductive connecting sheet. The pole structure of the large-capacity battery maximizes the contact area of the pole and the pole lug, ensures the connection reliability of each connection position of the pole, and is suitable for large-current charging and discharging of the large-capacity battery.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a conductive connecting piece and electrode structure between the terminal post and the tab of a high-capacity battery. Background Technology

[0002] Currently, the largest capacity square lithium battery on the market is 400Ah, while the largest capacity cylindrical battery is no more than 100Ah. All batteries on the market use thin sheet-like connecting pieces to connect the terminals and tabs. This structure cannot meet the requirements of large current flow. If used in large capacity batteries, when the battery charging and discharging current exceeds the current carrying capacity of the connecting pieces, the connecting pieces are prone to overheating or even burning out, which can easily cause battery damage or thermal runaway. Summary of the Invention

[0003] To address the shortcomings of existing devices, this application proposes a conductive connecting piece and electrode structure for use between the terminal post and the tab of a high-capacity battery.

[0004] This application provides a conductive connecting piece between the terminal post and the tab of a high-capacity battery. The conductive connecting piece is composed of multiple conductive metal connecting sheets of different lengths, and the metal connecting sheets can be folded after being welded together.

[0005] Preferably, the metal connecting sheet is folded into an M-shape after welding.

[0006] Preferably, after the metal connecting sheet is folded, the metal connecting sheet is completely included within the top surface of the roll core and the upward projection surface.

[0007] Preferably, the thickness of the metal connecting sheet is no more than 2 mm and there are no fewer than 2 layers.

[0008] Another aspect of this application provides a terminal structure for a high-capacity battery, which includes a terminal and the aforementioned conductive connecting piece. The terminal includes an upper terminal insert, an insulating pad, a lower terminal insert, a current collector of the lower insert, and an insulating connector. The conductive metal connecting pieces of different lengths are arranged from short to long, with one end sequentially welded to the current collector of the terminal tab, and the other end sequentially welded to the current collector of the lower terminal insert. The welding positions of each conductive metal connecting piece are parallel and parallel from the inside to the outside, but do not overlap.

[0009] Preferably, the insert on the pole post is a ring-shaped structure, and multiple evenly distributed mounting holes can be opened on the ring for fixing to the insert on the pole post.

[0010] Preferably, the insulating gasket is a silicone rubber gasket that can be snapped into the edge of the terminal hole on the battery cover to insulate the upper terminal insert from the top surface of the cover, the lower terminal insert from the side of the terminal hole, and the lower terminal insert from the bottom surface of the cover. The upper and lower surfaces of the insulating gasket have the same mounting holes as the upper terminal insert.

[0011] Preferably, the main body of the lower insert of the pole post is a columnar structure, with a ring-shaped structure in the middle of the waist that is the same as that of the upper insert of the pole post. The ring has mounting holes that are the same in distribution and size as those of the upper insert of the pole post, and a frustum-shaped welding base plate at the bottom.

[0012] Preferably, the lower insert current collector plate has the same shape and size as the electrode tab current collector plate and is welded to the bottom circular platform of the lower insert of the electrode post in the center.

[0013] Preferably, after the metal connecting sheet is welded, it needs to be folded into an M-shape or other shapes, and after folding, the metal connecting sheet is completely included in the top surface of the roll core and the upward projection surface.

[0014] Preferably, the insulating connector is a rivet with an insulating post at the rivet head to ensure that the rivet does not contact the battery cover plate after riveting.

[0015] Preferably, the electrode tab connecting piece, the metal connecting sheet, the upper electrode insert, and the lower electrode insert are made of copper or aluminum or copper or aluminum with a coating.

[0016] This application discloses a terminal structure for a high-capacity battery, which maximizes the contact area between the terminal and the tab, ensures the connection reliability of each connection point of the terminal, and is suitable for high-current charging and discharging of high-capacity batteries. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the embodiments of this application. The illustrative embodiments of this application and their descriptions are used to explain the embodiments of this application and do not constitute an improper limitation on the embodiments of this application.

[0018] Figure 1 This is an insert on the terminal post of a high-capacity battery according to an embodiment of this application.

[0019] Figure 2 This is an insulating pad for the terminal post of a high-capacity battery according to an embodiment of this application.

[0020] Figure 3 This is a lower insert for a high-capacity battery terminal as described in this application embodiment.

[0021] Figure 4 The lower insert of the pole post is welded to the current collector plate of the lower insert.

[0022] Figure 5 The lower insert current collector and the electrode current collector are welded together using multi-layer conductive connecting pieces.

[0023] Figure 6 This is a diagram showing the completed installation of the pole.

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

[0025] 1- Upper insert of terminal post, 2- Insulating gasket, 3- Lower insert of terminal post, 4- Lower insert current collector plate, 5- Current collector plate of terminal tab, 6- Multi-layer conductive connecting sheet, 7- Insulating rivet, 8- Battery cover. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments.

[0027] like Figure 1-5 As shown, the high-capacity battery terminal in this embodiment includes an upper terminal insert 1, an insulating pad 2, a lower terminal insert current collector 4, a multi-layer conductive connecting sheet 6, a lower terminal insert 3, and an insulating rivet 7. The conductive connecting sheet is composed of multiple layers of conductive connecting sheets 6 and can be folded after welding.

[0028] like Figure 5 As shown, the lower insert current collector 4 is welded to the bottom circular platform of the lower insert 3 of the pole post, ensuring that the lower insert 3 of the pole post is welded to the center of the conductive connecting plate base, maximizing the welding area and making the contact surfaces fully contact.

[0029] like Figure 6 As shown, the current collector 5 of the coiled core electrode tab and the current collector 4 of the lower insert of the electrode post 3 are placed side by side on the same plane. The current collector 5 of the electrode tab and the current collector 4 of the lower insert are welded in layers from short to long using multiple layers of 0.5mm thick conductive connecting sheets 6. Using multiple layers of conductive connecting sheets 6 to connect the current collector 5 of the electrode tab and the current collector 4 of the lower insert of the electrode post can maximize the cross-sectional area of ​​the connection between the two and ensure that the large current can be smoothly transferred to the electrode post through the multiple layers of conductive metal connecting sheets.

[0030] like Figure 6 As shown, after the multi-layer conductive connecting sheet 6 is welded, it needs to be folded into an M shape. After folding, ensure that the multi-layer connecting sheet is completely included in the top surface of the core and the upward projection surface.

[0031] To prevent the terminals from contacting the battery cover during and after installation, insert the insulating gasket 2 onto the battery cover 8, aligning all the mounting holes, and then insert the battery cover 8 with the insulating gasket 2 on. Figure 6 The lower insert 3 of the pole post is aligned with each mounting hole.

[0032] Insert the upper insert 1 into the lower insert 3 of the terminal post, align it with the mounting hole of the battery cover 8, and tighten each mounting hole with insulating rivets 7 to complete the terminal post assembly. This yields a conductive connecting piece and terminal post structure between the terminal post and the tab of a large-capacity battery according to an embodiment of this application. This terminal post structure of the large-capacity battery maximizes the cross-sectional area of ​​the connection between the terminal post and the tab, ensuring the connection reliability of each connection point of the terminal post, and is suitable for high-current charging and discharging of large-capacity batteries.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application and not to limit them. Although the embodiments of this application have been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the embodiments of this application. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the embodiments of this application should be covered within the protection scope of the claims of the embodiments of this application.

[0034] As is known from common technical knowledge, the embodiments of this application can be implemented through other embodiments that do not depart from their spirit or essential characteristics. Therefore, the above-disclosed embodiments are merely illustrative in all respects and are not the only ones. All changes within the scope of the embodiments of this application or within the scope equivalent to the embodiments of this application are included in the embodiments of this application.

Claims

1. A terminal structure for a high-capacity battery, comprising a terminal and a conductive connecting piece, wherein the terminal includes an upper terminal insert, an insulating pad, a lower terminal insert, a current collector plate of the lower insert, and an insulating connecting piece, wherein conductive metal connecting pieces of different lengths are arranged from short to long, one end of which is sequentially welded to the current collector plate of the terminal tab, and the other end is sequentially welded to the current collector plate of the lower terminal insert, and the welding positions of each conductive metal connecting piece are parallel and side by side from the inside to the outside but do not overlap; After the conductive metal connecting sheet is welded, it is folded into an M-shape or other shapes. After folding, the metal connecting sheet is completely included in the top surface of the roll core and the upward projection surface.

2. The electrode structure of the high-capacity battery according to claim 1, wherein, The upper insert of the pole post has a ring-shaped structure with multiple evenly distributed mounting holes for fixing to the lower insert of the pole post.

3. The electrode structure of the high-capacity battery according to claim 1, wherein, The insulating gasket is a silicone rubber gasket, which is placed at the edge of the terminal hole on the battery cover to insulate the upper terminal insert from the top surface of the cover, the lower terminal insert from the side of the terminal hole, and the lower terminal insert from the bottom surface of the cover. The upper and lower surfaces of the insulating gasket have the same mounting holes as the upper terminal insert.

4. The electrode structure of the high-capacity battery according to claim 1, wherein, The main body of the lower insert of the pole post is a columnar structure, with a ring-shaped structure in the middle of the waist that is the same as that of the upper insert of the pole post. The ring has mounting holes that are the same in distribution and size as those of the upper insert of the pole post, and a frustum-shaped welding base plate at the bottom.

5. The electrode structure of the high-capacity battery according to claim 1, wherein, The lower insert current collector plate has the same shape and size as the electrode tab current collector plate, and is welded in the center to the bottom circular platform of the lower insert of the electrode post.

6. The electrode structure of the high-capacity battery according to claim 1, wherein, The insulating connector is a rivet with an insulating post on the rivet head to ensure that the rivet does not contact the battery cover plate after riveting.

7. The electrode structure of the high-capacity battery according to claim 1, wherein, The electrode tab connecting piece, metal connecting sheet, upper electrode insert, and lower electrode insert are made of copper or aluminum or copper or aluminum with a coating.

8. The electrode structure of the high-capacity battery according to claim 1, wherein, The thickness of the metal connecting sheet shall not exceed 2mm, and there shall be no less than 2 layers.

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