A battery electrode group tab connection structure

Abstract

This utility model discloses a tab connection structure for a battery terminal group. In this structure, a row of positive tabs and a row of negative tabs in the battery terminal group are connected in series using a connector. The connector includes an upper connecting piece and a lower connecting piece. The lower connecting piece has a connecting hole for the positive or negative tab to pass through. The connector also includes a fixing mechanism for securing the upper and lower connecting pieces together. During assembly, the positive or negative tab passes through the connecting hole of the lower connecting piece, is bent, and then pressed down by the upper connecting piece in conjunction with the lower connecting piece. Finally, the fixing mechanism secures the upper and lower connecting pieces together. This utility model solves the melting / false welding problem of traditional casting and welding processes, optimizes current distribution, and reduces contact resistance. This structure improves assembly efficiency, corrosion resistance, and connection reliability, making it suitable for efficient and stable connection of battery terminal groups.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a battery electrode group tab connection structure. Background Technology

[0002] Traditional busbar connections involve melting lead in a lead pot, fusing the molten lead with the electrode tabs using a casting mold, and then cooling and solidifying it into a cast-welded busbar to achieve electrode connection. Traditional busbar connections are energy-intensive, complex, require strict temperature control during the casting process, have a high failure rate, and operate in a poor environment with high temperatures, generating lead fumes and causing serious environmental pollution.

[0003] Existing technologies, such as the utility model with publication number CN221353218U, attempt to replace metal busbars with plastic injection molding. While this solves the problem of metal corrosion, the injection-molded parts lack mechanical strength and require internal metal rods for reinforcement, leading to structural complexity. Similarly, the D-shaped aluminum extrusion profile proposed in the utility model with publication number CN222300804U optimizes the welding surface, but requires a dedicated bracket, limiting its versatility.

[0004] Moreover, current electrode tab welding is primarily done manually using lead melting, which is generally inefficient and prone to producing incomplete or false welds. This welding method is also polluting and energy-intensive, and its development has been somewhat limited due to pollution and occupational hazards during the production process. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a tab connection structure for battery terminals. This structure, using connectors, avoids the aforementioned problems, preventing product defects such as weld failure or false soldering. Furthermore, it is simple for employees to operate and provides a good working environment.

[0006] The specific technical solution of this utility model is as follows:

[0007] This utility model provides a tab connection structure for a battery electrode group. The battery electrode group includes alternating positive and negative plates. The top surface of the positive plate is provided with a positive tab, and the top surface of the negative plate is provided with a negative tab. The positive tabs are arranged in a row, and the negative tabs are arranged in a row. In the battery electrode group, each row of positive tabs and each row of negative tabs are connected in series using a connector. The connector includes an upper connecting piece and a lower connecting piece. The lower connecting piece is provided with a connecting hole for the positive or negative tab to pass through. The connector also includes a fixing mechanism for fixing the upper connecting piece and the lower connecting piece together.

[0008] During assembly, the positive or negative tab passes through the connecting hole of the lower connecting piece, and after bending, the upper connecting piece is used to press the positive or negative tab together with the lower connecting piece. Then, the fixing mechanism is used to fix the upper and lower connecting pieces together.

[0009] This utility model uses a connector to replace the busbar of a traditional battery, assembling and connecting the plates of the electrode group, which can avoid product defects such as casting welding failure or false welding.

[0010] Preferably, positive or negative tabs connected in series using the same connector are bent in the same direction. By unifying the bending direction, automated or semi-automated assembly can be achieved, reducing manual intervention and improving production efficiency. It also reduces current interference between tabs, lowers the risk of localized overheating, and improves the consistency of battery pack performance. Simultaneously, it avoids mutual compression or deformation of tabs due to inconsistent orientation, extending the lifespan of the electrode group.

[0011] Specifically, both the upper and lower connecting pieces are made of copper. Copper has a conductivity second only to silver, which can significantly reduce the internal resistance of the connector and reduce energy loss; copper has good corrosion resistance in the electrolyte environment, making it suitable for the charge and discharge cycles of the battery; and it can withstand the mechanical stress caused by the bending and vibration of the tabs.

[0012] Preferably, the fixing mechanism includes a bolt passing through the upper connecting piece and the lower connecting piece, and a nut that mates with the bolt. The bolt and nut provide a reliable mechanical connection, ensuring that the upper and lower connecting pieces tightly press the tabs together; it also optimizes the contact pressure between the tabs and the connector by adjusting the tightening force of the nut, balancing conductivity and mechanical strength.

[0013] Preferably, the axial length of the bent portion of the positive or negative electrode tab is 2-4 times the thickness of the positive or negative electrode tab. Sufficient bending length ensures full contact between the electrode tab and the connector, reducing contact resistance.

[0014] This utility model also provides a battery electrode group, using the electrode tab connection structure of the above-mentioned battery electrode group.

[0015] This utility model also provides a storage battery, including a battery case and a battery cover, wherein the battery case is provided with the aforementioned battery electrode group.

[0016] The beneficial effects of this utility model are:

[0017] This invention replaces the traditional busbar with a copper double-piece connector (upper connecting piece + lower connecting piece) and bolt fixing mechanism to achieve mechanical crimping of the electrode tabs, solving the problems of casting welding melt-off / false welding, and improving conductivity (low internal resistance of copper material) and corrosion resistance. The electrode tab unidirectional bending design (2-4 times the thickness bending length) optimizes current distribution and reduces contact resistance. Combined with the adjustable pressure bolt fixing method, it takes into account production automation (standardized assembly), structural stability (anti-loosening / anti-deformation) and full life cycle reliability (vibration resistance / aging resistance), significantly improving the process yield and electrical performance consistency of battery electrode group connection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the electrode tab connection structure of the battery electrode group of this utility model;

[0019] Figure 2 This is a front view of the electrode tab connection structure of the battery electrode group of this utility model;

[0020] Figure 3 for Figure 2 AA section diagram;

[0021] Figure 4 for Figure 2 BB cross-sectional view.

[0022] The markings in the diagram are: 1-connector, 11-upper connecting piece, 12-lower connecting piece, 121-connecting hole, 13-fixing mechanism, 131-bolt, 132-nut. Detailed Implementation

[0023] Depend on Figure 1-4 As shown, this utility model provides a battery electrode group tab connection structure. The battery electrode group includes alternating positive plates and negative plates. The top surface of the positive plate is provided with a positive tab, and the top surface of the negative plate is provided with a negative tab. The positive tabs are arranged in a row, and the negative tabs are arranged in a row. In the battery electrode group, a row of positive tabs and a row of negative tabs are connected in series using a connector 1. The connector 1 includes an upper connecting piece 11 and a lower connecting piece 12. The lower connecting piece 12 is provided with a connecting hole 121 for the positive or negative tab to pass through. The connector 1 also includes a fixing mechanism 13 for fixing the upper connecting piece 11 and the lower connecting piece 12 together.

[0024] During assembly, the positive or negative tab passes through the connecting hole 121 of the lower connecting piece 12, and after bending, the upper connecting piece 11 is used in conjunction with the lower connecting piece 12 to press the positive or negative tab together. Then, the fixing mechanism 13 is used to fix the upper connecting piece 11 and the lower connecting piece 12 together.

[0025] This utility model uses a connector to replace the busbar of a traditional battery, assembling and connecting the plates of the electrode group, which can avoid product defects such as casting welding failure or false welding.

[0026] Depend on Figure 3 and Figure 4 As shown, in order to avoid mutual compression or deformation of the tabs due to confusion in orientation, the positive or negative tabs connected in series using the same connector are designed to bend in the same direction. The standardized bending direction can be used in conjunction with automated equipment to reduce assembly time. The uniform arrangement of the tabs can also reduce the risk of short circuits caused by misalignment of the tabs, thereby extending the service life of the electrode group.

[0027] In this utility model, both the upper connecting piece 11 and the lower connecting piece 12 are made of copper. On the one hand, the low resistance design reduces heat generation, and the corrosion resistance of copper reduces the aging of the connectors. On the other hand, the high mechanical strength of copper can ensure that the connectors remain stable under vibration or impact.

[0028] The fixing mechanism 13 includes a bolt 131 passing through the upper connecting piece 11 and the lower connecting piece 12, and a nut 132 that mates with the bolt 131. The mechanical locking of the bolt and nut prevents the electrode lugs from loosening and reduces contact resistance fluctuations. The detachability of the bolt and nut simplifies the maintenance process and improves equipment availability.

[0029] In this invention, the axial length of the bent portion of the positive or negative electrode tab is 2-4 times the thickness of the positive or negative electrode tab. Sufficient bending length ensures full contact between the electrode tab and the connector, reducing contact resistance.

[0030] This utility model also provides a battery terminal group, using the tab connection structure of the battery terminal group provided by this utility model.

[0031] This utility model also provides a storage battery, including a battery case and a battery cover, wherein the battery case is provided with the aforementioned battery electrode group.

[0032] In this invention, each cell of a multi-cell battery contains a group of battery terminals with tab connection structures. To achieve cross-cell electrical connection, two methods can be used: one is to elevate the integrated tab connection structure, composed of upper and lower connecting pieces, above the height of the cell wall, allowing direct contact and conductivity between the connectors of adjacent cells; the other is to create channels in the cell wall, allowing the integrated tab connection structure to pass through the cell wall. Ultimately, this integrated tab connection structure connects to the terminal post and achieves electrical connection with external electrical appliances via terminals.

Claims

1. A tab connection structure for a battery electrode group, the battery electrode group comprising alternately stacked positive and negative plates, the top surface of the positive plate having a positive tab, the top surface of the negative plate having a negative tab, the positive tabs arranged in one row, and the negative tabs arranged in one row, characterized in that, In a battery terminal group, a row of positive tabs and a row of negative tabs are connected in series using a connector. The connector includes an upper connector and a lower connector. The lower connector has a connection hole for the positive or negative tab to pass through. The connector also includes a fixing mechanism for fixing the upper connector and the lower connector together. During assembly, the positive or negative tab passes through the connecting hole of the lower connecting piece, and after bending, the upper connecting piece is used to press the positive or negative tab together with the lower connecting piece. Then, the fixing mechanism is used to fix the upper and lower connecting pieces together.

2. The electrode tab connection structure of the battery electrode group according to claim 1, characterized in that, When positive or negative tabs connected in series using the same connector are bent, they should face the same direction.

3. The electrode tab connection structure of the battery electrode group according to claim 1, characterized in that, Both the upper and lower connecting pieces are made of copper.

4. The electrode tab connection structure of the battery electrode group according to claim 1, characterized in that, The fixing mechanism includes bolts passing through the upper connecting plate and the lower connecting plate, and nuts that mate with the bolts.

5. The electrode tab connection structure of the battery electrode group according to claim 1, characterized in that, The axial length of the bent portion of the positive or negative electrode tab is 2-4 times the thickness of the positive or negative electrode tab.

6. A battery electrode group, characterized in that, Use the tab connection structure of the battery electrode group according to any one of claims 1 to 5.

7. A storage battery, comprising a battery case and a battery cover, characterized in that, The battery compartment is provided with the battery electrode group as described in claim 6.

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