A connection structure between the lug and the pole of a large-capacity battery

Abstract

The present invention relates to a connection structure between a lug and a pole of a large-capacity battery, wherein the pole is provided with a pole current collecting disk, and the lug is provided with a pole current collecting disk. Since the pole is very thick, the connection between the pole and the pole current collecting disk and the lug current collecting disk cannot be welded. The present invention adds a conductive pad to the portion between the pole current collecting disk and the lug current collecting disk that cannot be welded, thereby avoiding heat generated by poor contact at the portion between the pole current collecting disk and the lug collecting disk that cannot be welded, maximizing the contact area between the pole and the lug, and ensuring the connection reliability of each connection of the pole. The battery is suitable for high-current charging and discharging of large-capacity batteries.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a connection structure between a tab and a pole of a large-capacity battery. Background Art

[0002] Currently, the largest capacity square lithium battery on the market is 400Ah, while the largest capacity cylindrical battery is no more than 100Ah. The battery poles and tabs are connected by thin-film connectors, which cannot meet the charging and discharging needs of large-capacity batteries. If a battery with a capacity greater than 1000Ah is designed, the connection between the poles and tabs becomes the biggest problem. The pole collector plate and tab collector plate of a large-capacity battery need to be fully connected, but during welding, the pole of the pole collector plate is vertically projected downward and cannot be welded to the tab collector plate due to the influence of the pole. In this way, the current transmission surface is much smaller. Poor contact will cause the contact surface to heat up, affecting the charging and discharging of large-capacity batteries. Summary of the Invention

[0003] In order to solve the above-mentioned shortcomings of the existing equipment, the present invention proposes a connection structure between the tab and the pole of a large-capacity battery.

[0004] The present invention provides a connection structure between a pole tab and a pole column of a large-capacity battery. In the connection structure, the pole column has a pole column current collecting disk, the pole tab has a pole tab current collecting disk, and a conductive pad is added to the portion between the pole column current collecting disk and the pole tab current collecting disk that cannot be welded.

[0005] Preferably, in the connection structure between the tab and the pole of the large-capacity battery, the conductive pad layer is in the form of a thin sheet with a thickness not greater than 3 mm.

[0006] Preferably, in the above-mentioned connection structure between the tab and the pole of the large-capacity battery, the conductive pad is placed in the non-weldable area between the tab current collecting disk and the pole current collecting disk, and its area is equal to the area of ​​the non-weldable area.

[0007] Preferably, in the connection structure between the tab and the pole of the large-capacity battery, the conductive pad is made of a metal or non-metallic conductive material.

[0008] Preferably, in the connection structure between the tab and the pole of the large-capacity battery, the conductive pad layer is made of one or more of silver sheet, copper sheet, nickel sheet, aluminum sheet, graphite sheet, foam silver, foam copper, foam aluminum, foam nickel and graphite wool.

[0009] Preferably, in the connection structure between the tab and the pole of the large-capacity battery, the conductive pad is a silver sheet, a copper sheet, foam silver or foam copper.

[0010] The present invention relates to a connection structure between a lug and a pole of a large-capacity battery. In the connection structure, the pole is provided with a pole current collecting disk, and the lug is provided with a pole current collecting disk. Since the pole is very thick, the connection between the pole and the pole current collecting disk and the lug current collecting disk cannot be welded. The present invention adds a conductive pad to the portion that cannot be welded between the pole current collecting disk and the lug current collecting disk, thereby avoiding heat caused by poor contact of the portion that cannot be welded between the pole current collecting disk and the lug collecting disk, maximizing the contact area between the pole and the lug, ensuring the connection reliability of each connection of the pole, and being suitable for high-current charging and discharging of large-capacity batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0012] Figure 1 Schematic diagram of a pole with a current collecting plate according to the present invention.

[0013] Figure 2 Schematic diagram of the winding core with tab collector plate.

[0014] Figure 3 Schematic diagram of the conductive pad layer.

[0015] Figure 4 This is a diagram of the positions of the conductive pad and the tab current collecting plate.

[0016] Figure 5 This is a schematic diagram of the welding installation of a pole with a collecting plate, a conductive pad, and a pole ear with a collecting plate.

[0017] Figure 6 This is the completed diagram of the pole installation.

[0018] Description of reference numerals:

[0019] 1-Pole with current collecting plate, 2-Pole ear current collecting plate, 3-Conductive pad, 4-Pole upper insert, 5-Insulating gasket, 6-Insulating connector, 7-Battery cover. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] like Figures 1 to 6 As shown, the conductive pad 3 is placed at the geometric center of the tab collector 2, the pole 1 with the collector is pressed onto the tab collector 2, the two collectors are aligned, and the other pole collectors except the pole are welded to the tab collector using a laser welding machine to ensure that the conductive pad is compressed after welding.

[0022] like Figure 6 As shown, in order to prevent the pole from contacting the battery cover during and after installation, insert the insulating gasket 5 into the battery cover 7, align the mounting holes of the insulating gasket 5 and the battery cover 7, and insert the battery cover 7 with the insulating gasket 5. Figure 5 The collecting plate pole 1 is provided with a current collecting plate, and the mounting holes are aligned.

[0023] Insert the pole upper insert 4 into the pole 1 with the current collecting plate, align it with the mounting hole of the battery upper cover 7, tighten the mounting holes with the insulating connector 6, and complete the pole assembly to obtain a large-capacity battery ear and pole connection structure of the present invention. This large-capacity battery ear and pole connection structure maximizes the connection cross-sectional area between the pole and the ear, ensures the connection reliability of each connection point of the pole, and is suitable for large-current charging and discharging of large-capacity batteries.

[0024] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A connection structure between a tab and a pole of a large-capacity battery, characterized in that: The pole is provided with a pole current collecting disk, and the tab is provided with a tab current collecting disk. The pole current collecting disk is welded to the tab current collecting disk except for the pole. A conductive pad is provided at the portion between the pole current collecting disk and the tab current collecting disk that cannot be welded. The conductive pad is in the form of a thin sheet with a thickness of no more than 3 mm.

2. The connection structure between the tab and the pole of a large-capacity battery according to claim 1, wherein: The area of ​​the conductive pad layer is equal to the area of ​​the non-weldable region.

3. The connection structure between the tab and the pole of a large-capacity battery according to claim 1, wherein: The conductive pad layer is made of metal or non-metal conductive material.

4. The connection structure between the tab and the pole of a large-capacity battery according to claim 3, wherein: The conductive pad layer is one or more of silver sheet, copper sheet, nickel sheet, aluminum sheet, foam silver, foam copper, foam nickel, foam aluminum, graphite sheet, and graphite wool.

5. The connection structure between the tab and the pole of a large-capacity battery according to claim 4, wherein: The conductive pad layer is a silver sheet, a copper sheet, foam silver or foam copper.

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