A collector plate for a large-capacity battery and its pole connection structure

Abstract

The present application discloses a current collector tray for a large-capacity battery and a large-capacity battery terminal connection structure comprising the current collector tray, a terminal, a terminal connecting piece, an insulating washer, and a fastener. The current collector tray has multiple side strips radially spaced along its circumference. The current collector tray is welded to the terminal connecting piece, and the multiple side strips can be folded upward and connected to the terminal. This terminal connection structure increases the flow area between the terminal and the current collector tray, meeting the battery's high-current charging and discharging requirements, maximizing the length of the battery coil, and contributing to increased battery capacity and energy density.

Description

Technical Field

[0001] The embodiments of the present application relate to a pole connection structure for a large-capacity battery, belonging to the technical field of battery components. Background Art

[0002] Lithium-ion batteries are widely used due to their high specific energy, long charge and discharge life, and wide operating temperature range. Traditional lithium battery designs use steel shells, aluminum-plastic films, or plastic shells. The current extraction structure is designed for low-current charging and discharging, making it difficult to carry large currents, affecting the performance and load requirements of lithium batteries. The battery pole is the output end of the battery current, and the battery current is extracted by connecting the pole to the winding core. Currently, the current transmission between the cylindrical battery pole and the internal battery cell in the lithium battery industry mostly requires the transfer of parts such as plates and adapter plates. This requires a large number of parts, a lengthy welding process, and limited internal space. In addition, the battery capacity is not high. The maximum capacity of cylindrical batteries known on the market does not exceed 100Ah.

[0003] Large-capacity batteries require that the poles and their connectors have a sufficiently large flow area, and the flow area is related to the size and thickness of the connectors. When the thickness of the connectors exceeds 1mm, the current laser welding process cannot guarantee the welding quality of the tabs, current collectors and connectors. In addition, the high temperature generated by high-power laser welding will damage the pole piece structure and even cause thermal runaway of the battery cell. Summary of the Invention

[0004] To solve the above problems, an embodiment of the present application provides a pole connection structure for a large-capacity battery, which can achieve a reliable connection between the collecting plate and the guide post, and at the same time can greatly increase the flow area.

[0005] The present application provides a current collecting plate for a large-capacity battery, characterized in that the current collecting plate has a plurality of side strips distributed radially at intervals along the circumference, the current collecting plate is welded to the pole connecting piece, and the plurality of side strips can be folded upward and connected to the pole.

[0006] Preferably, the plurality of side strips are evenly distributed rectangular side strips.

[0007] Preferably, the collecting plate is circular, with a plurality of seepage grooves evenly distributed along the circumference near the edge, and the thickness of the collecting plate is not greater than 1 mm.

[0008] The present application also provides a pole connection structure for a large-capacity battery, including a pole, the aforementioned current collecting plate, a pole connecting piece, an insulating washer and a fastener.

[0009] Preferably, the pole connecting piece and the current collecting plate are both provided with seepage grooves of the same position and size.

[0010] The pole body is equipped with an axial positioning ring, which, when assembled, is positioned beneath the insulating washer below the cover plate. Preferably, the current collecting plate is circular, with four seepage grooves evenly distributed along its circumference near the edge. The thickness of the current collecting plate is no greater than 1 mm. One side of the current collecting plate is first welded to the pole piece of the winding core, and the other side is welded to the pole connecting piece.

[0011] Preferably, the pole connecting piece is circular, with a diameter the same as that of the collecting plate, and a seepage groove is provided on the pole connecting piece, which has the same size and position as the seepage groove on the collecting plate, and the thickness of the pole connecting piece is not more than 1 mm; the pole connecting piece is first welded to the bottom surface of the pole and then welded to the collecting plate.

[0012] Preferably, the collecting plate and the pole connecting piece are evenly coated with conductive glue on the surface of the inconvenient welding area below the projection surface of the pole, which can increase the flow area and ensure good conductivity between the collecting plate and the pole connecting piece; further preferably, a conductive gasket can also be set at the corresponding position to achieve the same purpose.

[0013] Preferably, the insulating gasket is a hollow cylinder with a flange, the height of which is half the thickness of the cover plate, and is located on the upper and lower sides of the cover plate respectively.

[0014] Preferably, the fasteners are two fastening bolts, which fix the pole to the cover plate from the upper and lower surfaces of the cover plate respectively.

[0015] Preferably, the pole, current collecting plate and pole connecting piece are made of aluminum or copper.

[0016] An embodiment of the present application provides a current collecting plate and a pole connection structure for a large-capacity battery. The rectangular side strips of the current collecting plate increase the contact area between the pole and the current collecting sheet, which can improve the flow area of the pole. At the same time, applying conductive glue to the parts where the pole connecting sheet and the current collecting plate are inconvenient to weld can also increase the flow area, thereby meeting the flow requirements of large-capacity battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 This is an overall schematic diagram of the pole connection structure of this application.

[0019] Figure 2 This is an exploded view of the pole connection structure of this application.

[0020] Figure 3 This is a schematic diagram of the structure of the pole of this application.

[0021] Figure 4Schematic diagram of the collecting plate structure before welding.

[0022] Figure 5 Schematic diagram of the collecting plate structure after welding.

[0023] Figure 6 This is a schematic diagram of the structure of the pole connecting piece of this application.

[0024] Figure 7 This is a schematic structural diagram of the insulating gasket of this application.

[0025] In the figure, 1 is the first fastening screw, 2 is the first insulating washer, 3 is the cover, 4 is the pole, 5 is the second insulating washer, 6 is the second fastening screw, 7 is the pole connecting piece, 8 is the current collecting plate DETAILED DESCRIPTION

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

[0027] In the embodiments of this application, Figures 1 to 7 The figure shows a pole connection structure for a large-capacity battery, including a pole 4, a current collecting plate 8, a pole connecting plate 7, a first insulating washer 2 and a second insulating washer 5, a first fastener 1 and a second fastener 6. The current collecting plate 8 has multiple side strips distributed radially at intervals along the circumference. The current collecting plate 8 is welded to the pole connecting plate 7, and the multiple side strips are folded upward and connected to the pole 4.

[0028] The collecting plate 8 is circular and has four seepage grooves evenly distributed along the circumference near the edge, which is conducive to the uniform distribution of the electrolyte in the winding core. The thickness of the collecting plate is not more than 1mm; one side of the collecting plate is first welded to the pole piece of the winding core, and the other side is welded to the pole connecting piece 7.

[0029] The pole connecting piece 7 is circular and has the same diameter as the collecting plate 8. A seepage groove is provided on the pole connecting piece, which has the same size and position as the seepage groove on the collecting plate 8. The thickness of the pole connecting piece 7 is not more than 1 mm. The pole connecting piece 7 is first welded to the bottom surface of the pole and then welded to the collecting plate 8.

[0030] An axial positioning ring 41 is provided on the body of the pole 4. When assembled, the positioning ring 41 is located below the insulating washer 5 on the lower surface of the cover plate 3, thereby ensuring insulation between the pole and the cover plate.

[0031] The insulating washers 2 and 5 are hollow cylindrical with flanges, and their height is half the thickness of the cover plate 3 , and they are located on the upper and lower sides of the cover plate respectively.

[0032] The first fastener 1 and the second fastener 6 fix the pole to the cover plate from the upper and lower surfaces of the cover plate respectively.

[0033] The surfaces where the collecting plate 8 and the pole connecting piece 7 are welded to each other are evenly coated with conductive glue in the area below the projection surface of the pole 4 where welding is inconvenient, so as to ensure the conductivity between the contact surfaces of the two.

[0034] Optionally, in this embodiment, a conductive gasket may be provided at a corresponding position to achieve the same purpose.

[0035] like Figure 2 As shown, the axial positioning ring 41 of the pole 4 is located below the cover plate 3, insulated from the cover plate 3 by a first insulating washer 2 and a second insulating washer 5, and fixedly connected to the cover plate 3 by a first fastener 1 and a second fastener 6. The pole connecting piece 7 is first welded to the bottom surface of the pole 4. The current collecting plate 8 is first welded to the pole piece, and then to the pole connecting piece 7. Conductive adhesive is evenly applied to the current collecting plate 8 and the pole connecting piece 7 in an area below the projected area of the pole 4 where welding is inconvenient. The two components are then securely welded from the edges. The multiple rectangular side strips extending around the circumference of the current collecting plate 8 are then folded upward and securely welded to the pole 4. Through these steps, the connection between the pole and the current collecting plate is completed. This connection structure increases the welding area between the current collecting plate and the pole, namely, by adding multiple rectangular side strips to the current collecting plate, which are folded upward and welded to the pole body. This improves the current conductivity of the pole, making it suitable for high-current charging and discharging of batteries. This pole connection structure is simple, easy to process, and convenient to weld, making it suitable for connecting cells in large-capacity batteries.

[0036] 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.

Claims

1. A large-capacity battery pole connection structure, comprising a cover plate, a pole, a current collecting plate, a pole connecting piece, an insulating washer, and a fastener; The pole connecting piece is circular, and its diameter is the same as that of the collecting plate. The pole connecting piece is provided with a seepage groove, which is the same in size and position as the seepage groove on the collecting plate. The thickness of the pole connecting piece is not more than 1 mm. The bottom surface of the pole is welded to the pole connecting piece, the bottom surface of the pole connecting piece is welded to the collecting plate, and the collecting plate and the pole connecting piece are evenly coated with conductive glue in the area below the projection area of the pole where welding is inconvenient; The collecting disc has a plurality of side strips distributed radially at intervals along the circumference. The collecting disc is welded to the pole connecting piece. The plurality of side strips can be folded upward and connected to the pole.

2. The large-capacity battery terminal connection structure according to claim 1, characterized in that: The pole body is provided with an axial positioning ring, which is located below the insulating washer below the cover plate during assembly.

3. The large-capacity battery terminal connection structure according to claim 1, characterized in that: The insulating gasket is in the shape of a hollow cylinder with a flange, and its height is half of the thickness of the cover plate, and is respectively located on the upper and lower sides of the cover plate.

4. The large-capacity battery terminal connection structure according to claim 1, characterized in that: The fasteners are two fastening nuts, which fix the pole and the cover plate from the upper and lower surfaces of the cover plate respectively.

5. The large-capacity battery terminal connection structure according to claim 1, characterized in that: The pole, current collecting plate and pole connecting piece are made of aluminum or copper.

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