A conductive connecting piece and pole structure for a large-capacity battery

Abstract

The embodiments of the present application relate to a conductive connecting piece and a pole structure between a large-capacity battery pole and a tab. A rectangular connecting grid of equal width and spacing is provided along the centerline of the conductive connecting piece. The two sides of the conductive connecting piece are respectively connected to the pole and the tab or tab current collecting plate. The pole structure of a large-capacity battery includes the pole and the aforementioned conductive connecting piece. The pole structure of the large-capacity battery in the embodiments of the present application maximizes the contact area between the pole and the tab, ensures the connection reliability of each connection point of the pole, and is suitable for high-current charging and discharging of large-capacity batteries.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of batteries, and in particular to a conductive connecting piece and a pole structure between a pole and a tab 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 poles and tabs of all batteries on the market are connected by thin connecting pieces. This structure cannot meet the requirements of large currents. If used on large-capacity batteries, when the battery charging and discharging current is greater than the current carrying capacity of the connecting piece, the connecting piece will easily heat up or even burn out, which can easily cause battery damage or thermal runaway. Summary of the Invention

[0003] In order to solve the shortcomings of the above-mentioned existing equipment, the embodiments of the present application propose a conductive connecting piece and a pole structure for use between a pole and a tab of a large-capacity battery.

[0004] An embodiment of the present application provides a conductive connecting plate between a large-capacity battery pole and a tab. A rectangular connecting grid of equal width and spacing is provided along the center line of the middle portion of the conductive connecting plate. The two sides of the grid of the conductive connecting plate are respectively connected to the pole and the tab or the tab current collecting plate.

[0005] Preferably, both sides of the grid on the same side of the conductive connecting piece are connected to the pole and the tab or tab current collecting plate respectively.

[0006] Preferably, the conductive connecting sheet can be folded along a center line.

[0007] Preferably, the thickness of the conductive connecting sheet is not greater than 3 mm.

[0008] Preferably, when a tab current collecting plate is provided in the battery, the shapes and sizes of the two sides of the grid are the same as those of the tab current collecting plate.

[0009] Another aspect of an embodiment of the present application provides a pole structure for a large-capacity battery, including a pole and the aforementioned conductive connecting piece, wherein the pole includes a pole upper insert, an insulating gasket, a pole lower insert and an insulating connecting piece, and the pole is welded in the center of one side of the same surface as the conductive connecting piece. After welding, the pole is bent outward 90 degrees along the vertical center line of the grid, and the pole ear current collecting plate is welded on the other side. The unwelded surface is folded and the upper and lower layers are pressed and welded, or conductive glue is added between the upper and lower layers to connect them.

[0010] Preferably, the pole upper insert is an annular structure, and a plurality of evenly distributed mounting holes may be provided on the ring for fixing with the pole lower insert.

[0011] Preferably, the insulating gasket is a silicone rubber gasket, which can be clamped at the edge of the pole hole in the battery cover to insulate the pole upper insert from the top surface of the upper cover, the pole lower insert from the side of the pole hole, and the pole lower insert from the bottom surface of the upper cover. The upper and lower sides of the insulating gasket have the same mounting holes as the pole upper insert.

[0012] Preferably, the main body of the pole lower insert is a columnar structure, with a ring structure in the middle of the waist that is the same as the pole upper insert, the ring has mounting holes with the same distribution and size as the pole upper insert, and a truncated cone-shaped welding base plate at the bottom.

[0013] Preferably, the insulating connector is a rivet, and the rivet head is provided with an insulating column to ensure that the rivet does not contact the battery upper cover after riveting.

[0014] Preferably, the conductive connecting piece, the pole upper insert and the pole lower insert are made of copper or aluminum or copper or aluminum with a coating.

[0015] The embodiment of the present application discloses a pole structure for a large-capacity battery, which maximizes the contact area between the pole and the tab, ensures the connection reliability of each connection point of the pole, and is suitable for high-current charging and discharging of large-capacity batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings in the specification that constitute part of this application are used to provide further understanding of the embodiments of this application. The schematic embodiments of the embodiments of this application and their descriptions are used to explain the embodiments of this application and do not constitute improper limitations on the embodiments of this application.

[0017] Figure 1 This is a pole upper insert for a large-capacity battery pole according to an embodiment of the present application.

[0018] Figure 2 This is an insulating gasket for a large-capacity battery electrode according to an embodiment of the present application.

[0019] Figure 3 This is a lower insert for a large-capacity battery electrode according to an embodiment of the present application.

[0020] Figure 4 It is the conductive connecting piece of the pole tab.

[0021] Figure 5 This is the installation diagram of the conductive connecting piece, the lower insert of the pole, and the battery coil core.

[0022] Figure 6 This is the completed installation diagram of the battery cell, the lower insert of the pole and the conductive connecting piece.

[0023] Figure 7 This is an assembly diagram of the electrode column and the battery cell top cover for a large-capacity battery in an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 1-Pole upper insert, 2-Insulation gasket, 3-Pole lower insert, 4-Conductive connecting piece, 5-Battery core, 6-Insulation rivet, 7-Battery upper cover DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0027] like Figure 1-4 As shown, the electrode for a large-capacity battery according to an embodiment of the present application includes an upper electrode insert 1 , an insulating gasket 2 , a conductive connecting piece 4 , a lower electrode insert 3 and an insulating rivet 6 .

[0028] Figure 5 The assembly structure of the conductive connecting piece 4, the lower insert 3 of the pole, and the battery winding core 5 is shown. The conductive connecting piece 4 is circular, and a rectangular connecting grid of equal width and equal distance is provided in the middle along the center line. The lower insert 3 of the pole and the half surface of the grid of the conductive connecting piece 4 are laser-welded in the center to ensure that the contact surface between the pole and the conductive connecting piece is maximized. After welding, the conductive connecting piece 4 is bent 90 degrees, with the lower insert of the pole facing outward, and the other half of the conductive connecting piece 4 is laser-welded to the pole lug collector of the winding core 5, and then the conductive connecting piece 4 is bent into the shape shown in FIG. Figure 6 As shown, the two bent surfaces can be pressed and welded or conductive adhesive can be added to maximize the conductive area and conductive capacity of the conductive connecting sheet.

[0029] like Figure 7 As shown, in order to prevent the pole from contacting the battery cover during and after installation, insert the insulating gasket 2 into the battery cover 7, align the mounting holes of the insulating gasket 2 and the battery cover 7, and insert the battery cover 7 with the insulating gasket 2. Figure 5 The lower insert 3 of the pole is aligned with the mounting holes.

[0030] Insert the upper insert 1 of the pole into the lower insert 3 of the pole, align it with the mounting holes of the battery cover 7, tighten the mounting holes with insulating rivets 6, and complete the pole assembly to obtain the large-capacity battery conductive connecting piece and pole structure of the embodiment of the present application. The pole structure of this large-capacity battery maximizes the connection cross-sectional area of ​​the pole and the pole 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.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application and are not intended to limit them. Although the embodiments of the present application have been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the embodiments of the present application can still be modified or replaced by equivalents. Any modifications or equivalent replacements that do not depart from the spirit and scope of the embodiments of the present application should be included in the scope of protection of the claims of the embodiments of the present application.

[0032] It is known from common technical knowledge that the embodiments of the present application can be implemented by other implementation schemes that do not deviate from the spirit or essential features thereof. Therefore, the above-disclosed implementation schemes are merely illustrative in all respects and are not exclusive. All modifications within the scope of the embodiments of the present application or within the scope equivalent to the embodiments of the present application are included in the embodiments of the present application.

Claims

1. A conductive connecting piece for a large-capacity battery, wherein: A rectangular connection grid of equal width and spacing is provided in the middle of the conductive connecting piece along the center line, and the conductive connecting piece can be folded along the center line; half of the surfaces on both sides of the grid of the conductive connecting piece are respectively laser-welded to the pole and the tab or the tab collector; the thickness of the conductive connecting piece is not greater than 3 mm; one side of the same surface of the conductive connecting piece is laser-welded to the pole in the center, and after welding, the pole is bent outward 90 degrees along the vertical center line of the grid, and the other side is connected to the tab or the tab collector.

2. The conductive connecting sheet according to claim 1, wherein: When a tab current collecting plate is provided in the battery, the shapes and sizes of both sides of the grid are the same as those of the tab current collecting plate.

3. A pole structure for a large-capacity battery, comprising a pole and a conductive connecting piece as described in any one of claims 1 to 2, wherein the pole comprises an upper pole insert, an insulating gasket, a lower pole insert and an insulating connector, and the pole is fully laser-welded in the center of one side of the same surface of the conductive connecting piece. After welding, the pole is bent outward 90 degrees along the vertical center line of the grid, and the other side is connected to the pole ear or the pole ear current collecting plate is laser-connected. The unwelded surface is then folded and the upper and lower layers are pressed and welded, or conductive glue is added between the upper and lower layers to connect them.

4. The electrode structure of a large-capacity battery according to claim 3, wherein: The pole upper insert is a ring-shaped structure with a plurality of evenly distributed mounting holes on the ring for fixing with the pole lower insert.

5. The electrode structure of a large-capacity battery according to claim 3, wherein: The insulating gasket is a silicone rubber gasket, which is clamped on the edge of the pole hole in the battery cover to insulate the upper pole insert from the top surface of the upper cover, the lower pole insert from the side of the pole hole, and the lower pole insert from the bottom surface of the upper cover. The upper and lower sides of the insulating gasket have the same mounting holes as the upper pole insert.

6. The electrode structure of a large-capacity battery according to claim 3, wherein: The pole lower insert has a columnar structure, with a ring structure in the middle of the waist that is the same as the pole upper insert, mounting holes of the same size and distribution as the pole upper insert are provided on the ring, and a frustum-shaped welding base plate is provided at the bottom.

7. The electrode structure of a large-capacity battery according to claim 3, wherein: The insulating connector is a rivet, and the rivet head is provided with an insulating column to ensure that the rivet does not contact the battery upper cover after riveting.

8. The electrode structure of a large-capacity battery according to claim 3, wherein: The conductive connecting piece, the pole upper insert and the pole lower insert are made of copper or aluminum or copper or aluminum with a coating.

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