Special-shaped tab

Abstract

The utility model relates to the technical field of lithium ion batteries, in particular to a special-shaped tab, which is characterized by comprising an exposed tab area and an internal welding area, the internal welding area is arranged inside a battery cell and is used for being welded with a battery cell electrode, the exposed tab area is arranged outside the battery cell, a fusing area is arranged between the exposed tab area and the internal welding area, and the fusing area is used for fusing the exposed tab area and the internal welding area. The side face of the fusing area is sealed through the packaging area. According to the utility model, the plurality of fusing strips are arranged between the exposed area and the internal welding area, and the tab glue is compounded on the two surfaces to form the packaging area and the fusing area, so that the current of the battery in a short-circuit test is extremely large, the heat of the battery body is gathered quickly, and the thermal runaway condition is easy to occur; when the battery is in use, the fusing phenomenon of the fusing strip occurs, continuous heat accumulation is interrupted, the safety problems of short circuit and the like of the battery in the use process are solved, the risk is reduced to the minimum, and the overall mechanical strength of the tab can not be influenced on the premise that the fusing function is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium ion battery technical field, concretely relates to a special-shaped tab. BACKGROUND

[0002] With the wide application of lithium ion battery, the attention of its increasingly prominent safety problem is also higher and higher. In addition, the continuous improvement of energy density, the development of chemical materials and mechanical materials are more and more extreme, which undoubtedly brings certain influence to the safety performance of battery. Especially, the current industry has a large number of certification systems, which have clear requirements and test methods for safety test. Among them, the high-temperature short-circuit test item is an important reference and index for evaluating the safety of battery.

[0003] Lithium ion battery is a kind of secondary battery with superior performance and recyclable, which is composed of anode and cathode sheets, isolation film, electrolyte, mechanical parts and other main components. At present, the safety performance of lithium ion battery is generally researched in two directions, for example, by optimizing the modification of positive and negative materials, the addition of electrolyte additives and the thick coating of isolation film, etc. to improve the overall safety performance of the battery. Another direction is to increase safety protection measures outside the battery, such as thermal resistance tab, protection plate, etc.

[0004] In the prior art, the width of the external tab is usually controlled to improve the short-circuit test. However, due to the narrow width of the external or internal tab, a large proportion of tab breakage occurs during actual welding or assembly, resulting in battery failure.

[0005] Based on this, the present application provides a special-shaped tab, which can eliminate the disadvantages of the existing device. UTILITY MODEL CONTENT

[0006] In view of the above problems, a special-shaped tab is provided, which solves the problems of short-circuit test safety and tab breakage in assembly by setting a fuse strip.

[0007] To solve the problems of the prior art, the utility model provides a special-shaped tab, which comprises an exposed tab area and an internal welding area, the internal welding area is arranged inside the battery cell for welding with the battery electrode, the exposed tab area is arranged outside the battery cell, a fuse area is arranged between the exposed tab area and the internal welding area, and the side of the fuse area is sealed by a packaging area; the packaging area comprises an aluminum plastic film aluminum layer, a tab rubber inner melting layer and a tab rubber and aluminum plastic film inner melting layer, the side of the fuse strip is provided with a tab rubber inner melting layer, the side of the tab rubber inner melting layer is provided with a tab rubber and aluminum plastic film inner melting layer, and the side of the tab rubber and aluminum plastic film inner melting layer is provided with an aluminum plastic film aluminum layer.

[0008] Preferably, the fuse area comprises a plurality of fuse strips arranged between the exposed tab area and the internal welding area.

[0009] Preferably, the length of the fuse bar is 3mm-4mm, the width of the fuse bar is 1mm-3mm, and the thickness of the fuse bar is 0.3mm-0.6mm.

[0010] Compared with the prior art, the utility model has the beneficial effects that:

[0011] The utility model discloses a kind of special-shaped tab structures, including exposed tab area 101 and internal welding area 102, the internal welding area 102 is arranged in the inside of battery core for welding with the electrode of the battery core, the exposed tab area 101 is arranged in the outside of battery core, and the exposed tab area 101 and internal welding area 102 are provided with fuse area 300, and the side of fuse area 300 is sealed by packaging area 200. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a special-shaped tab three-dimensional structure schematic diagram.

[0013] Fig. 2 It is a special-shaped tab plan view schematic diagram.

[0014] Fig. 3 It is a special-shaped tab A-A section three-dimensional structure schematic diagram.

[0015] In the drawing, the reference numerals are: 101, exposed tab area;102, internal welding area;200, packaging area;201, aluminum plastic film aluminum layer;202, tab rubber inner side melting layer;203, tab rubber and aluminum plastic film inner side melting layer;300, fuse area;301, fuse bar. DETAILED DESCRIPTION

[0016] In order to further understand the characteristics, technical means and specific purposes and functions reached by the utility model, the utility model will be described in further detail in combination with the drawings and specific embodiments.

[0017] Referring to Figs. 1-3 A special-shaped tab, including exposed tab area 101 and internal welding area 102, the internal welding area 102 is arranged in the inside of battery core for welding with the electrode of the battery core, the exposed tab area 101 is arranged in the outside of battery core, and the exposed tab area 101 and internal welding area 102 are provided with fuse area 300, and the side of fuse area 300 is sealed by packaging area 200.

[0018] Between the exposed tab area 101 and the internal welding area 102, one or more fuses 301 are manufactured by cleaning or welding, and then the tab glue is compounded on both sides. The tab glue selects the commonly used 55um or 80um three-layer composite structure, and the material is polypropylene, which can provide additional protection and fixing effect, form the packaging area 200 and the fuse area 300, and the fuse area 300 needs to be quickly fused to cut off the circuit when overcurrent. Such tab structure, under the premise of having the function of fusing, can also not affect the overall mechanical strength of the tab, ensuring the yield of subsequent processing. The exposed tab area 101 is directly connected with the external circuit.

[0019] Referring to Fig. 3 : The fuse area 300 includes a plurality of fuses 301 arranged between the exposed tab area 101 and the internal welding area 102.

[0020] Manufacturing fuses 301 between the exposed tab area 101 and the internal welding area 102 can provide overcurrent protection when the battery is abnormal. The size of the fuse 301 is fixed, which can ensure that they can be reliably fused when needed.

[0021] Referring to Figs. 1-3 : The packaging area 200 includes an aluminum plastic film aluminum layer 201, an inner side melting layer 202 of tab glue, and an inner side melting layer 203 of tab glue and aluminum plastic film. The side of the fuse 301 is provided with the inner side melting layer 202 of tab glue, the side of the inner side melting layer 202 of tab glue is provided with the inner side melting layer 203 of tab glue and aluminum plastic film, and the side of the inner side melting layer 203 of tab glue and aluminum plastic film is provided with the aluminum plastic film aluminum layer 201.

[0022] The aluminum plastic film aluminum layer 201, the inner side melting layer 202 of tab glue, and the inner side melting layer 203 of tab glue and aluminum plastic film are connected to form a current channel and a sealing structure inside the battery, ensuring the firmness and sealing of the connection.

[0023] Referring to Fig. 3 : The length of the fuse 301 is 3mm-4mm, the width of the fuse 301 is 1mm-3mm, and the thickness of the fuse 301 is 0.3mm-0.6mm.

[0024] The size of the fuse 301 is finally selected after testing, which can ensure that they can be reliably fused when needed, and when not needed, it does not affect the overall mechanical strength of the tab, ensuring the yield of subsequent processing.

[0025] Working principle: connect the exposed tab area 101 with external circuit, current flows through the fuse strip 301 and internal welding area 102, the current of the battery is very large in short circuit test, which can cause the battery body to heat up quickly and easily cause thermal runaway, when the temperature rises sharply, the fuse strip 301 is fused, interrupting the continuous accumulation of heat, ensuring the safety of the battery in the event of a short circuit during practical use, minimizing the risk, the packaging area 200 is used to composite the two sides of the fuse strip 301, ensuring the firmness and sealing of the connection, by setting such a tab structure, the overall mechanical strength of the tab can be realized without affecting the overall mechanical strength of the tab under the premise of having the function of fusing, ensuring the subsequent processing rate.

[0026] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A shaped tab, characterized by, It includes exposed tab area (101) and internal welding area (102), the internal welding area (102) is arranged inside the battery for welding with the electrode of the battery, the exposed tab area (101) is arranged outside the battery, the exposed tab area (101) and internal welding area (102) are provided with fuse area (300), the side of fuse area (300) is sealed by packaging area (200); The fuse area (300) includes a plurality of fuse strips (301) arranged between the exposed tab area (101) and the internal welding area (102); The packaging area (200) includes an aluminum plastic film aluminum layer (201), an inner side melting layer of tab rubber (202) and an inner side melting layer of tab rubber and aluminum plastic film (203), the side of the fuse strip (301) is provided with the inner side melting layer of tab rubber (202), the side of the inner side melting layer of tab rubber (202) is provided with the inner side melting layer of tab rubber and aluminum plastic film (203), and the side of the inner side melting layer of tab rubber and aluminum plastic film (203) is provided with the aluminum plastic film aluminum layer (201).

2. A shaped tab according to claim 1, wherein, The length of the fuse strip (301) is 3-4 mm, the width of the fuse strip (301) is 1-3 mm, and the thickness of the fuse strip (301) is 0.3-0.6 mm.

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