A tab connecting structure of a large capacity battery and a large capacity battery

Abstract

The application discloses a tab connecting structure of a large-capacity battery and the large-capacity battery, and relates to the technical field of batteries.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application belongs to the technical field of batteries, and particularly relates to a tab connecting structure of a large-capacity battery and the large-capacity battery. BACKGROUND

[0002] Lithium ion batteries are widely used due to their high specific energy, long charge-discharge life, wide use temperature range and other characteristics. The traditional lithium battery design adopts a steel shell, an aluminum plastic film or a plastic shell, and the current leading structure is designed for small current charging and discharging, which is difficult to bear large current charging and discharging, affecting the use effect and load demand of the lithium battery. The battery pole is the output end of the battery current, and the battery current is led out through the connection of the pole and the winding core. At present, the current transmission between the cylindrical battery pole and the internal winding core in the lithium battery industry mostly needs parts such as the pole plate and the adapter plate for transmission, and the parts are more, the welding process is long, the internal space is small, and the capacity of the battery is not high. The maximum capacity of the known cylindrical battery on the market does not exceed 100 Ah.

[0003] The large-capacity battery requires that the pole and its connecting parts have a large enough flow area, and the flow area is related to the size and thickness of the connecting parts. When the thickness of the connecting parts exceeds 1 mm, the current laser welding process cannot guarantee the welding quality of the tab, the current collector plate and the connecting parts, and the high temperature generated by the high-power laser welding will damage the structure of the pole piece and even cause the thermal runaway of the winding core. SUMMARY

[0004] To solve the above problems, the embodiment of the present application provides a tab connecting structure of a large-capacity battery, which only needs a few parts to realize the connection of the tab and the battery pole, and also meets the large current passing capacity.

[0005] In order to achieve the above technical effects, the embodiment of the present application provides a tab connecting structure of a large-capacity battery, which includes a current collector plate and a conductive gasket, the current collector plate includes a disc body and a rim arranged on the disc body, and the conductive gasket is arranged in the rim; wherein the shape and size of the rim are the same as those of the pole.

[0006] Preferably, the bottom surface of the current collector plate is welded with the tab, and the rim is welded with the pole body.

[0007] Preferably, the rim is rectangular, circular or square, and the height of the rim is not less than 5 mm and the thickness of the rim is not greater than 1 mm.

[0008] Preferably, the disc body of the current collector plate is a circular disc body and the thickness of the disc body is not greater than 1 mm.

[0009] Preferably, the circular disc body is uniformly distributed with at least four liquid permeation holes near the edge position along the circumference.

[0010] Preferably, the liquid-permeable holes are strip-shaped or circular.

[0011] Preferably, the conductive pads are arranged between the areas where the pole and the current collector plate are inconvenient to be welded. The conductive pads are ultra-high conductive silica gel pieces, which have the same shape and size as the end surface of the pole.

[0012] Preferably, the material of the current collector plate is aluminum or copper.

[0013] The embodiment of the present application also provides a large-capacity battery comprising the pole tab connecting structure of the large-capacity battery.

[0014] The embodiment of the present application has the following beneficial effects:

[0015] The pole tab connecting structure of the large-capacity battery provided by the embodiment of the present application has simple structure, easy-to-process components and convenient welding. The rectangular, circular or square edge covering arranged on the surface of the current collector plate and the pole can realize multi-surface welding of the current collector plate and the pole, and can increase the current passing area. Meanwhile, the ultra-high conductive silica gel piece arranged at the position where the bottom surface of the pole and the current collector plate are inconvenient to be welded can also increase the current passing area, so that the current passing requirement of the large-capacity battery can be met.

[0016] Other advantages, objects and features of the embodiment of the present application will be embodied in part by the following description, and will be understood by those skilled in the art through research and practice of the embodiment of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0018] Fig. 1 It is a whole schematic view of a pole tab connecting structure.

[0019] Fig. 2 It is an exploded view of a pole tab connecting structure.

[0020] Fig. 3 It is a current collector plate 1.

[0021] Fig. 4 It is a current collector plate 2.

[0022] Fig. 5 It is a current collector plate 3.

[0023] Fig. 6 It is a pole tab connecting structure body 1.

[0024] Fig. 7 The tab connecting structure 2 is used for connecting the tab 4 and the pole 1. DETAILED DESCRIPTION

[0025] The technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0026] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0027] The technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0028] As shown in the drawings, the embodiments of the present application provide a tab connecting structure of a large-capacity battery, which comprises a current collecting disc 3 and a conductive gasket 2. Figs. 1 to 7 The current collecting disc 3 comprises a circular disc body 31 and a rectangular, circular or square edge 32 arranged on the circular disc body 31, and the conductive gasket 2 is arranged in the rectangular, circular or square edge 32.

[0029] The bottom surface of the current collecting disc is welded with the tab, and the edge is welded with the pole body.

[0030] The edge 32 has the same shape and size as the pole 1, that is, the edge 32 is consistent with the rectangular, circular or square pole body 1.

[0031] Further, the edge 32 is rectangular, circular or square, and the height of the edge is not less than 5mm and the thickness is not greater than 1mm.

[0032] The disc body 31 of the current collecting disc 3 is a circular disc body and the thickness is not greater than 1mm. The current collecting disc 3 is circular and the thickness is not greater than 1mm, and the circular disc body 31 is uniformly distributed with at least four liquid permeable holes 33 near the edge position along the circumference.

[0033] The conductive gasket 2 is an ultra-high conductive silica gel sheet, which is rectangular, circular or square and has the same size as the end surface of the pole; the bottom surface of the current collecting disc 3 is welded with the tab 4, and the rectangular, circular or square edge is welded with the pole body; the contact surface of the mutually welded surface of the pole 1 and the current collecting disc 3 below the projection surface of the end surface of the pole is provided with the conductive gasket 2, that is, the conductive gasket is provided on the area surrounded by the edge, and is combined closely with the end surface of the pole 1.

[0034] The material of the current collecting disc 3 is preferably aluminum or copper.

[0035] The embodiments of the present application also provide a large-capacity battery comprising the tab connecting structure of the large-capacity battery.

[0036] As shown in Figs. 1 to 7 The current collector plate 3 is first welded with the tab 4 above the winding core 5, then the current collector plate 3 is welded with the pole 1, the rectangular, circular or square edge 32 on the current collector plate 3 is welded with the pole body of the pole 1, the contact surface of the mutually welded surface of the pole 1 and the current collector plate 3 below the projection surface of the end surface of the pole is provided with the conductive pad 2, that is, the conductive pad 2 is provided on the area surrounded by the edge 32 and is combined closely with the end surface of the pole 1.

[0037] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present application. Those skilled in the art can easily realize other modifications. Therefore, the present application is not limited to the specific details and the figures shown and described herein without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A tab connection structure of a large capacity battery comprising a current collector plate and a conductive gasket, characterized by, The current collecting plate comprises a plate body and a rim arranged on the plate body, and the conductive pad is arranged in the rim; The rim has the same shape and size as the pole, the bottom surface of the current collecting plate is welded with the tab, and the rim is welded with the pole body; the conductive pad is arranged in the area where the pole and the current collecting plate cannot be welded.

2. The tab connecting structure of a high capacity battery according to claim 1, wherein The rim is rectangular, square or circular, and the height of the rim is not less than 5 mm and the thickness is not more than 1 mm.

3. The tab connecting structure of a high capacity battery according to claim 1, wherein The plate body of the current collecting plate is a circular plate body and the thickness is not more than 1 mm.

4. The tab connecting structure of a large capacity battery according to claim 3, wherein The circular plate body is uniformly provided with at least four liquid permeable holes near the edge along the circumference.

5. The tab connecting structure of a high capacity battery according to claim 1, wherein The conductive pad is an ultra-high conductive silica gel sheet, and has the same shape and size as the end surface of the pole.

6. A tab connection structure for a large capacity battery according to any one of claims 1 to 5, wherein The material of the current collecting plate and the pole connecting plate is aluminum or copper.

7. A high capacity battery characterized by The tab connecting structure of the large capacity battery comprises a tab and a current collecting plate connected with the tab.

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