Positive collector plate capable of directionally fusing of large cylindrical lithium battery

Abstract

The utility model discloses a positive collector plate capable of being directionally fused for a large cylindrical lithium battery. The positive collector plate comprises a positive collector plate, a directional fusing gap, a roll core, an extension handle and a cap aluminum plate, the positive current collecting disc is made of 1060-O; the directional fusing gap is arranged on the extension handle, and the directional fusing gap is positioned on one side, close to the cap aluminum plate after the extension handle is bent, far away from the positive electrode end face diaphragm and a central hole diaphragm pre-rolling position; the corner of a welding track is in smooth transition, so that anomalies such as short circuit of the roll core caused by the fact that laser welding heat is concentrated to burn through a diaphragm are prevented; and a feeding fool-proof hole is formed in the positive current collecting disc. The directional fusing notch is designed at the extension handle of the positive collector plate, when the battery is subjected to external short circuit, the extension handle is fused at the appointed design position close to one side of the cap, and the fusing position is far away from the diaphragm, so that the hidden danger of thermal runaway uncontrollability caused by internal short circuit due to diaphragm shrinkage caused by high temperature is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery positive current collecting disc technical field especially, relates to a big cylindrical lithium battery positive current collecting disc of directional fusing. BACKGROUND

[0002] The existing big cylindrical lithium battery full tab structure, the positive current collecting disc extension handle and the cap aluminum plate are welded, the extension handle is bent into the shell, and the battery is sealed. The extension handle mainly bears the overcurrent capacity of the battery. When the finished battery is used, the external short circuit current of the battery will instantaneously increase, and when the overcurrent capacity of the positive extension handle is exceeded, the extension handle will be fused, and the battery will be broken to prevent explosion and other dangerous conditions. The existing battery is not fixed when the extension handle is fused after the battery is short-circuited. If it is fused near the current collecting disc side, high temperature will cause the diaphragm to shrink and the positive and negative electrodes to contact, causing internal short circuit. There may be a great safety hazard of thermal runaway. SUMMARY

[0003] Based on the technical problems existing in the background technology, the utility model provides a big cylindrical lithium battery positive current collecting disc with directional fusing. The extension handle of the positive current collecting disc is designed with a directional fusing notch. The cross-sectional area of the notch is small, and the overcurrent capacity is weak. The extension handle and the cap aluminum plate are welded and bent into the shell. The extension handle is fused near the cap aluminum plate side. When the battery is externally short-circuited, the internal current increases, the temperature rises, and the directional fusing is performed at the designed fusing notch. The notch is close to the cap side away from the diaphragm after the extension handle is bent, avoiding the abnormal shrinkage of the diaphragm caused by high temperature.

[0004] The utility model provides a big cylindrical lithium battery positive current collecting disc, including positive current collecting disc, directional fusing notch, roll core, extension handle and cap aluminum plate;

[0005] The material of the positive current collecting disc is 1060-O;

[0006] The directional fusing notch is arranged on the extension handle, and the directional fusing notch is located at the side away from the positive electrode end surface diaphragm and the center hole diaphragm pre-winding after the extension handle is bent close to the cap aluminum plate;

[0007] The positive current collecting disc and the positive electrode end of the roll core are welded, and the corner of the welding track is smoothly transitioned to prevent the laser welding heat from being concentrated to burn through the diaphragm and cause roll core short circuit and other abnormalities;

[0008] The positive current collecting disc is provided with a feeding foolproof hole. The CCD recognition system can identify the front and back surfaces of the current collecting disc during automatic feeding of the current collecting disc, preventing the current collecting disc and the positive electrode end of the roll core from being welded reversely.

[0009] A big cylindrical lithium battery positive current collecting disc with directional fusing includes the following steps:

[0010] S1: the positive current collector disc is laser welded with the positive end of the winding core, and the negative current collector disc is laser welded with the negative end of the winding core;

[0011] S2: the winding core is sleeved with an insulating sheet and wrapped with a high-temperature adhesive tape, and the winding core is put into a shell;

[0012] S3: after being put into the shell, the winding core is spot welded, the shell is rolled into a groove, and the winding core is baked and then liquid is injected;

[0013] S4: after the liquid is injected, the positive current collector disc is welded with the cap aluminum plate, and the positive current collector disc is bent into the shell;

[0014] S5: the winding core is sealed, and after being sealed, the directional melting gap on the extension handle of the positive current collector disc is on one side of the cap aluminum plate;

[0015] S6: the winding core is subjected to subsequent production processes after being sealed.

[0016] The positive current collector disc extension handle is designed with a directional melting gap, so that when an external short circuit occurs in the battery, the extension handle is melted at the designated position close to the cap, and the melting position is far away from the diaphragm, thereby preventing the diaphragm from shrinking due to high temperature to cause internal short circuit and achieve the purpose of preventing the hidden danger of uncontrollable thermal runaway. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the utility model after the extension handle is bent;

[0019] Figure 3 It is a structural schematic diagram of the utility model of the lithium battery and the cap aluminum plate;

[0020] Figure 4 It is a structural schematic diagram of the utility model of the positive current collector disc and the cap aluminum plate welding line and the cap.

[0021] In the figure: 1, positive current collector disc; 2, directional melting gap; 3, welding track; 4, gap; 5, feeding foolproof hole; 6, winding core; 7, extension handle; 8, lithium battery; 9, cap aluminum plate; 10, positive current collector disc and cap aluminum plate welding line; 11, cap. DETAILED DESCRIPTION

[0022] The utility model will be further described below in combination with specific embodiments. EMBODIMENT

[0023] REFERENCE Figures 1-4 In the embodiment, a positive current collector disc capable of directional melting of a large cylindrical lithium battery is provided, which comprises a positive current collector disc 1, a directional melting gap 2, a winding core 6, an extension handle 7 and a cap aluminum plate 9.

[0024] The positive current collector plate 1 is made of 1060-O;

[0025] The directional melting gap 2 is arranged on the extension handle 7, and is located at a side of the cap aluminum plate 9 away from the positive electrode end surface diaphragm and the center hole diaphragm pre-winding after the extension handle 7 is bent;

[0026] The positive current collector plate 1 is welded with the positive electrode end of the winding core 6; the welding track is as shown in Figure 1 The corner of the welding track is smoothly transitioned to prevent the heat of laser welding from being concentrated to burn through the diaphragm and cause short circuit of the winding core and other abnormalities.

[0027] The positive current collector plate 1 is provided with a feeding foolproof hole 5; the CCD recognition system can recognize the front and back surfaces of the current collector plate during automatic feeding of the current collector plate, so that the welding of the current collector plate and the positive electrode end of the winding core in reverse is prevented.

[0028] A positive current collector plate of a large cylindrical lithium battery capable of directional melting includes the following steps:

[0029] S1: The positive current collector plate 1 is laser welded with the positive electrode end of the winding core 6; the negative current collector plate is laser welded with the negative electrode end of the winding core 6;

[0030] S2: The winding core 6 is sleeved with an insulating sheet and wrapped with a high-temperature adhesive tape, and the winding core 6 is put into the shell;

[0031] S3: The winding core 6 is spot-welded after being put into the shell, the shell is rolled, and the winding core 6 is baked and then liquid is injected;

[0032] S4: After the liquid is injected, the positive current collector plate 1 is welded with the cap aluminum plate 9, and the positive current collector plate 1 is bent into the shell;

[0033] S5: The winding core 6 is sealed, and the directional melting gap 2 on the extension handle 7 of the positive current collector plate 1 is located at a side of the cap aluminum plate 9;

[0034] S6: The winding core 6 is subjected to subsequent production processes after being sealed.

[0035] As can be seen from the large cylindrical positive current collector plate and the welding method, the utility model provides a novel large cylindrical battery positive current collector plate, the extension handle 7 of the positive current collector plate 1 is designed with a directional melting gap 2, the cross-sectional area of the directional melting gap 2 is small and the flow capacity is weak, the extension handle 7 is welded and bent into the shell after being welded with the cap aluminum plate 9, the directional melting gap 2 at the extension handle 7 is located at a side of the cap aluminum plate 9 away from the positive electrode end surface diaphragm and the center hole diaphragm pre-winding, when external short circuit occurs in the lithium battery 8, the internal current and temperature rise and the directional melting gap 2 is designed to perform directional melting, and the directional melting gap 2 at the bent extension handle 7 is located at a side of the cap 11 to avoid the abnormality that the diaphragm shrinks due to excessively high temperature.

[0036] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A large cylindrical lithium battery orientable fusing positive current collector plate, characterized in that, It comprises a positive current collecting plate (1), a directional melting break (2), a winding core (6), an extension handle (7) and a cover cap aluminum plate (9); The positive current collecting plate (1) is made of 1060-O; The directional melting break (2) is arranged on the extension handle (7), and is located at a side of the extension handle (7) away from the positive electrode end surface and close to the cover cap aluminum plate (9) after being bent, and is located at a position of the winding core (6) away from the center hole diaphragm pre-winding position; The positive current collecting plate (1) is welded with the winding core (6) at a positive electrode end; The positive current collecting plate (1) is provided with a feeding anti-fool hole (5).

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