Cylindrical battery with high supporting strength

Abstract

The utility model discloses a cylindrical battery with high support strength, belongs to the technical field of cylindrical batteries, and provides a strong support cathode end mechanism in the cylindrical battery, which comprises a cathode tab, an insulating ring, a sealing ring, a pressure-bearing insulating sheet, a cathode collector plate and a cathode stud, the supporting ribs are arranged on the pressure-bearing insulating sheet, so that the pressure-bearing insulating sheet can fill the gap between the negative electrode current collecting disc and the cylindrical shell, the stress balance of the negative electrode end is guaranteed, the stress balance of the positive electrode end is further guaranteed, and the welding yield of the positive electrode side is effectively guaranteed; in addition, the pressure-bearing insulating sheet has an excellent supporting effect, is thickened compared with the whole body, and has the advantage of light weight.

Description

TECHNICAL FIELD

[0001] The utility model relates to cylindrical battery technical field, concretely relates to a cylindrical battery with high supporting strength. BACKGROUND

[0002] With the continuous development of lithium battery industry and the large demand of energy storage field and the requirement of product scale low cost, with the help of the technical advantages of cylindrical battery's energy density, charge and discharge rate, internal resistance and the cost potential of batch production, the development of domestic cylindrical battery is increasing, at present, the positive tab and the positive current collector plate of the positive electrode of the large cylindrical battery are connected by laser welding, when executing the process, tooling is needed to press tightly, the welding position of the battery is stressed more closely to reduce the defect of the positive current collector plate welding spot, improve the first time yield and production efficiency.

[0003] In the traditional cylindrical battery, due to the existence of the protruding tab on the negative electrode, the stress on the positive side is not balanced after the tooling is pressed, the welding surface is not uniformly attached, which causes the problem of welding spot and contact failure in the welding process. SUMMARY

[0004] In order to solve the problem of welding spot caused by the unbalanced stress on the positive side of the traditional cylindrical battery after the tooling is pressed, the utility model provides a cylindrical battery with high supporting strength.

[0005] A cylindrical battery with high supporting strength, comprising a cylindrical shell, a battery cell, a positive current collector plate and a strong supporting negative electrode mechanism, the battery cell is arranged inside the cylindrical shell, the positive part of the battery cell is in electrical conduction with the cylindrical shell, the length of the battery cell is in excess of the cylindrical shell, the positive current collector plate and the strong supporting negative electrode mechanism are arranged at both ends of the cylindrical shell, the improvement lies in that the strong supporting negative electrode mechanism comprises a negative tab, an insulating ring, a sealing ring, a pressure bearing insulating sheet, a negative current collector plate and a negative stud;

[0006] The negative tab is connected with the negative part of the battery cell, the negative current collector plate is welded on the negative tab, the negative stud is fixedly arranged on the negative current collector plate, and the cylindrical shell encapsulates the negative tab and the negative current collector plate inside; the pressure bearing insulating sheet is provided with supporting ribs, and the pressure bearing insulating sheet is filled between the negative current collector plate and the cylindrical shell to isolate the two and increase the internal supporting strength; the insulating ring is arranged on the negative stud; the sealing ring is arranged between the negative stud and the cylindrical shell to insulate the two and seal the cylindrical battery.

[0007] Preferably, the pressure-bearing insulation sheet is flat and circular ring-shaped, with a circular hole in the middle for passing through the negative pole stud; one side of the pressure-bearing insulation sheet is flat, and the other side is provided with a plurality of support ribs; the flat part of the pressure-bearing insulation sheet corresponds to the contact of the negative pole current collector, and the support ribs correspond to the contact of the cylindrical shell.

[0008] Preferably, the support rib is trapezoidal and radially arranged.

[0009] Preferably, the support rib is arc-shaped and arranged in a head-to-tail corresponding manner.

[0010] Preferably, the support rib is spiral-shaped.

[0011] Preferably, the strong support negative end mechanism further comprises a nut and an upper insulation sheet; the nut is threadedly connected with the negative pole stud, and the upper insulation sheet is arranged between the nut and the cylindrical shell.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] The technical scheme provided by the utility model comprises a negative pole tab, an insulation ring, a sealing ring, a pressure-bearing insulation sheet, a negative pole current collector and a negative pole stud; the support rib arranged on the pressure-bearing insulation sheet fills the gap between the negative pole current collector and the cylindrical shell, ensures the stress balance of the negative end, further ensures the stress balance of the positive end, effectively guarantees the positive side welding yield, and the pressure-bearing insulation sheet has the advantages of light weight and excellent support effect compared with overall thickening. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a partial schematic view of the strong support negative end mechanism in the utility model;

[0015] Figure 2 It is an installation schematic view of the pressure-bearing insulation sheet in the utility model;

[0016] Figure 3 It is a first structure schematic view of the pressure-bearing insulation sheet in the utility model;

[0017] Figure 4 It is a second structure schematic view of the pressure-bearing insulation sheet in the utility model;

[0018] Figure 5 It is a third structure schematic view of the pressure-bearing insulation sheet in the utility model;

[0019] Figure 6 It is an installation schematic view of the nut and the upper insulation sheet in the utility model;

[0020] Wherein, 1-cylinder shell; 2-electricity core; 3-negative pole lug; 4-insulation ring; 5-sealing ring; 6-pressure insulation sheet; 7-negative pole collector; 8-negative pole stud; 9-nut; 10-upper insulation sheet. DETAILED DESCRIPTION

[0021] In order to better understand the utility model, the content of the utility model is further explained below in conjunction with the drawings and examples of the specification.

[0022] The embodiment provides a cylindrical battery with high support strength, comprising a cylindrical shell 1, an electricity core 2, a positive pole collector and a strong support negative pole end mechanism, the electricity core 2 is arranged inside the cylindrical shell 1, the electricity core 2 is an internal energy storage part of a conventional cylindrical battery, comprising a positive pole part and a negative pole part, which are not described in detail here, the positive pole part is in electrical conduction with the cylindrical shell 1, the length of the electricity core 2 is in interference with the cylindrical shell 1, and the positive pole collector and the strong support negative pole end mechanism are arranged at both ends of the cylindrical shell 1. Figure 1 As shown in the cross-sectional view of the strong support negative pole end mechanism, it comprises a negative pole lug 3, an insulation ring 4, a sealing ring 5, a pressure insulation sheet 6, a negative pole collector 7 and a negative pole stud 8; the negative pole lug 3 is connected with the negative pole part of the electricity core 2, the negative pole collector 7 is welded on the negative pole lug 3, the negative pole stud 8 is fixedly arranged on the negative pole collector 7, and the cylindrical shell 1 encapsulates the negative pole lug 3 and the negative pole collector 7 inside; the pressure insulation sheet 6 is provided with a support rib, the pressure insulation sheet 6 is filled between the negative pole collector 7 and the cylindrical shell 1, so as to isolate and increase the internal support strength of the two; the insulation ring 4 is arranged on the negative pole stud 8; the sealing ring 5 is arranged between the negative pole stud 8 and the cylindrical shell 1, so as to insulate the two and seal the cylindrical battery.

[0023] When the cylindrical battery is welded with the positive pole collector, the tool needs to be pressed tightly, that is, the two ends of the cylindrical battery are extruded by the tool. The traditional cylindrical battery is provided with an insulation sheet between the battery shell and the negative pole collector on the negative pole side, but in order to reduce the weight of the cylindrical battery, the insulation sheet does not fill the space between the two, and in the extrusion process, the negative pole stud part bears a large force, and after the force is transmitted, the positive pole side bears uneven force, the welding surface is not uniformly attached, and welding defects such as explosion points occur in the welding process.

[0024] Therefore, the mounting schematic view of the pressure insulation sheet 6 in the application is shown in Figure 2 As shown in the mounting schematic view of the pressure insulation sheet 6, the pressure insulation sheet 6 can be a flat circular ring, as shown in Figure 3As shown, the middle is a round hole for passing through the negative stud 8; one side of the pressure bearing insulation sheet 6 is a plane, and the other side is provided with a plurality of support ribs; the plane part of the pressure bearing insulation sheet 6 corresponds to the contact of the negative current collector plate 7, and the support rib corresponds to the contact of the cylindrical shell 1.

[0025] The support rib is trapezoidal and is arranged in an axial radiation manner.

[0026] The support rib can be arc-shaped, such as Figure 4 As shown, the head and tail are arranged in a corresponding manner.

[0027] The support rib can be spiral-shaped, such as Figure 5 As shown.

[0028] The strong support negative end mechanism further comprises a nut 9 and an upper insulation sheet 10, and the installation schematic diagram is as shown in Figure 6 The nut 9 is threadedly connected with the negative stud 8, and the upper insulation sheet 10 is arranged between the nut 9 and the cylindrical shell 1.

[0029] In the installation, the pressure bearing insulation sheet 6 can electrically insulate the negative current collector plate 7 and the cylindrical shell 1, and can effectively support the space between the two, and is not filled, so as to increase the axial pressure bearing capacity of the cylindrical battery under the condition of ensuring that the overall weight of the cylindrical battery is not high, and effectively cope with the problem of uneven adhesion of the positive electrode welding surface caused by the tool clamping process.

[0030] Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

Claims

1. A cylindrical battery with high support strength, comprising a cylindrical shell (1), an electric core (2), a positive electrode current collector and a strong support negative electrode end mechanism, the electric core (2) is arranged inside the cylindrical shell (1), the positive electrode part of the electric core (2) is in electrical conduction with the cylindrical shell (1), the length of the electric core (2) is in interference with the cylindrical shell (1), the positive electrode current collector and the strong support negative electrode end mechanism are arranged at both ends of the cylindrical shell (1), characterized in that, The strong support negative end mechanism comprises a negative tab (3), an insulating ring (4), a sealing ring (5), a pressure-bearing insulating sheet (6), a negative current collector (7) and a negative stud (8); The negative tab (3) is connected with the negative part of the battery cell (2), the negative current collector (7) is welded on the negative tab (3), the negative stud (8) is fixedly arranged on the negative current collector (7), and the cylindrical shell (1) encapsulates the negative tab (3) and the negative current collector (7) in the inside; the pressure-bearing insulating sheet (6) is provided with a support rib, the pressure-bearing insulating sheet (6) is filled between the negative current collector (7) and the cylindrical shell (1) to isolate the two and increase the internal support strength; the insulating ring (4) is arranged on the negative stud (8); the sealing ring (5) is arranged between the negative stud (8) and the cylindrical shell (1) to insulate the two and seal the cylindrical battery.

2. A high support strength cylindrical battery as defined in claim 1, wherein, The pressure-bearing insulating sheet (6) is a flat circular ring, and a circular hole is arranged in the middle for passing through the negative stud (8); one side of the pressure-bearing insulating sheet (6) is a plane, and the other side is provided with a plurality of support ribs; the plane part of the pressure-bearing insulating sheet (6) corresponds to the negative current collector (7) in contact, and the support ribs correspond to the cylindrical shell (1) in contact.

3. A high support strength cylindrical battery as defined in claim 2, wherein, The support rib is trapezoidal and arranged in an axial radiation manner.

4. A high support strength cylindrical battery as defined in claim 2, wherein, The support rib is arc-shaped and arranged in a head-to-tail corresponding manner.

5. A high support strength cylindrical battery as defined in claim 2, wherein, The support rib is spiral-shaped.

6. A high support strength cylindrical battery as defined in claim 1, wherein, The strong support negative end mechanism further comprises a nut (9) and an upper insulating sheet (10); The nut (9) is threadedly connected with the negative stud (8), and the upper insulating sheet (10) is arranged between the nut (9) and the cylindrical shell (1).

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