Cylindrical multi-tab battery weld penetration prevention gasket

Abstract

The utility model relates to a cylindrical multi-tab battery anti-penetration welding gasket. An electric resistance welding through hole for an electric resistance welding copper needle to penetrate through is formed in the center of the gasket; the outer circumference of the gasket is provided with a plurality of bending grooves which are respectively and correspondingly connected with a plurality of tabs in a penetrating manner; a plurality of liquid guide holes are formed in the gasket between every two bent grooves in the radial direction; the outer circumference of the gasket is provided with more than one positioning bayonet which is used for correspondingly clamping a positioning head on a current collecting disc pressing tab welding die. By additionally arranging the gasket, the multiple tabs correspondingly penetrate through the bending grooves in the periphery of the gasket and then are bent, the current collecting disc is connected in a pressing mode, the pressing die is clamped, and then the current collecting disc can be welded. The gaskets are arranged below the tabs, so that the tabs can be prevented from being extruded into the pole group when the mold is clamped, the pole group is prevented from being damaged and pseudo soldering is avoided, and the welding efficiency of the collector plate is improved; meanwhile, the pole group can be prevented from being damaged due to the fact that the tabs are welded through when the welding power and temperature are too high, and the welding yield of the pole group is improved.

Description

Technical Field

[0001] The utility model relates to a battery structure, in particular to a cylindrical multi-electrode battery anti-welding gasket. Background Art

[0002] In multi-electrode lithium-ion batteries, there is no need to weld the pole tabs additionally, but the pole tab group needs to be welded to the collector plate, which requires that the pole tab group and the collector plate must be in close contact during the collector plate welding process, and the welding equipment also requires high stability. At present, the pole tab group of cylindrical multi-electrode lithium-ion batteries is directly welded after being pressed onto the collector plate. The pole tab group and the collector plate are prone to poor contact, resulting in cold welding, or welding penetration when the welding power and temperature are too high, which damages the pole group and reduces the product yield. Summary of the invention

[0003] The technical problem to be solved by the utility model is that, in the process of welding the pole lug group and the current collecting disk of a multi-pole lug battery, the pole lug group and the current collecting disk are not in contact with each other, resulting in cold welding, so that the internal pole lug cannot be effectively welded to the current collecting disk; when the welding power and temperature are too high, the pole group is easily welded through, resulting in a short circuit, and causing the product yield to be too low. A cylindrical multi-pole lug battery anti-welding gasket with a simple structure is provided, which can ensure the pole lug group to pass through, has stable positioning, and has high welding quality with the current collecting disk.

[0004] In order to solve the above problems, the utility model adopts the following technical solutions: a cylindrical multi-electrode battery anti-welding gasket, characterized in that: a resistance welding through hole for the resistance welding copper needle to pass through is arranged in the center of the gasket; a plurality of bending grooves corresponding to the multi-electrode connection are arranged on the outer circumference of the gasket; a plurality of radial liquid guide holes are arranged on the gasket between the bending grooves; and more than one positioning bayonet corresponding to the positioning head on the mold for clamping the collector plate and pressing the electrode ear welding is arranged on the outer circumference of the gasket.

[0005] The width of the bending groove is greater than the width of the tab, and the depth of the bending groove is greater than the thickness of the tab.

[0006] Four radial liquid guide holes are provided on the gasket between the two bending grooves.

[0007] The bending groove is a U-shaped groove.

[0008] The beneficial effects of the utility model are:

[0009] 1. During the welding process, by adding a gasket, the multi-electrode tabs are bent after passing through the bending grooves on the outer periphery of the gasket, and the current collector is crimped, and the clamping mold is clamped to weld the current collector. Since there is a gasket under the tab, it can prevent the tab from being squeezed into the pole group when the mold is clamped, damaging the pole group and causing cold welding, thereby improving the welding efficiency of the current collector; at the same time, it can also prevent the tab from being welded through and damaging the pole group when the welding power and temperature are too high, thereby improving the welding yield of the pole group.

[0010] 2. The positioning bayonet on the outer periphery of the gasket can be used to connect the mold, which can quickly and firmly clamp it to prevent loosening, effectively improve the stability and accuracy of crimping, and further improve the welding yield.

[0011] 3. There are 4 longitudinally arranged liquid guide holes on both sides of the bending groove of the gasket for electrolyte penetration. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 This is a state diagram used in the present utility model.

[0014] In the figure: gasket 1, resistance welding through hole 2, bending groove 3, liquid guide hole 4, positioning bayonet 5, pole ear 6, pole group 7, current collecting plate 8. DETAILED DESCRIPTION

[0015] The following is a further description with reference to the accompanying drawings.

[0016] Figure 1-2 As shown: A cylindrical multi-electrode battery anti-welding gasket, a resistance welding through hole 2 for the resistance welding copper needle to pass through is arranged in the center of the gasket 1; a plurality of bending grooves 3 corresponding to the multi-electrode insertion are arranged on the outer circumference of the gasket 1; a plurality of radial liquid guide holes 4 are arranged on the gasket between two bending grooves; and more than one positioning bayonet 5 corresponding to the positioning head on the mold for clamping the collector plate and pressing the electrode ear welding is arranged on the outer circumference of the gasket.

[0017] In this embodiment, the bending groove is preferably a U-shaped groove, the width of which is greater than the width of the tab, and the depth of which is greater than the thickness of the tab.

[0018] In this embodiment, four radial liquid guide holes are preferably provided on the gasket between the two bending grooves.

[0019] exist Figure 2 In the embodiment, three pole ears 6 need to be bent and crimped and welded to the pole group 7 by the current collecting plate 8, and the gasket 1 of the present application is added to the pole group 7. Multiple pole ears 6 pass through the bending groove 3 on the outer periphery of the gasket 1 and are pressed onto the gasket 1 by the current collecting plate 8 after being bent, and are pressed along the direction of the pole group 7 in cooperation with the mold. The mold is positioned and plugged by the positioning head and the positioning bayonet 5 to effectively prevent loosening of the pressing.

Claims

1. A cylindrical multi-electrode battery anti-welding gasket, characterized in that: A resistance welding through hole is arranged at the center of the gasket for the resistance welding copper needle to pass through; a plurality of bending grooves corresponding to the connection of multiple pole ears are arranged on the outer circumference of the gasket; a plurality of radial liquid guide holes are arranged on the gasket between the bending grooves; and more than one positioning socket corresponding to the positioning head on the mold for clamping the collector plate and pressing the pole ear welding is arranged on the outer circumference of the gasket.

2. A cylindrical multi-electrode battery anti-welding gasket according to claim 1, characterized in that: The width of the bending groove is greater than the width of the tab, and the depth of the bending groove is greater than the thickness of the tab.

3. The anti-welding gasket for cylindrical multi-electrode batteries according to claim 1 is characterized in that: Four radial liquid guide holes are provided on the gasket between the two bending grooves.

4. The anti-welding gasket for cylindrical multi-electrode batteries according to claim 1 is characterized in that: The bending groove is a U-shaped groove.

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