Soft package lithium battery with safety performance

Abstract

The utility model provides a soft package lithium battery with safety performance, and relates to the field of lithium batteries, the soft package lithium battery with safety performance comprises a lithium battery body, the lithium battery body comprises a shell, an aluminum tab and a nickel tab, and the lower end of the aluminum tab and the lower end of the nickel tab are provided with low-melting-point glue layers. The shell and the aluminum tab are connected through the low-melting-point glue layer, the shell and the nickel tab are connected through the low-melting-point glue layer, the aluminum tab and the nickel tab extend into the shell, the aluminum tab, the nickel tab and the shell are welded together by adopting the low-melting-point glue layer at the packaging temperature of 130-160 DEG C, and when the battery encounters abnormal conditions such as short circuit, high temperature and overcharge, the battery can be used for packaging the battery. When the internal temperature reaches more than 100 DEG C, the low-melting-point adhesive layer on the aluminum tab and the low-melting-point adhesive layer on the nickel tab enter a molten state, so that the packaging strength is lost, heat and gas generated in the battery are discharged, and the battery is effectively prevented from being ignited and exploded.

Description

Technical Field

[0001] The present application relates to the field of lithium batteries, and in particular to a soft-pack lithium battery with high safety performance. Background Art

[0002] At present, the packaging temperature of soft-pack lithium batteries is 170-200℃, and the melting point of the ear glue of the ear is 160-170℃. The melting point and packaging temperature are relatively high. When the battery is short-circuited, overcharged, or thermally shocked, a series of complex chemical reactions mainly releasing heat will occur inside the battery, causing the internal temperature of the battery to rise sharply, and produce flammable gases such as CO, H2, C2H4, and CH4. When the temperature exceeds 150 degrees and the internal pressure reaches a certain level, the battery will experience thermal runaway, resulting in accidents such as combustion and explosion. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a soft-pack lithium battery with safe performance, which can solve the technical problem that the battery may explode due to heating.

[0004] An embodiment of the present application provides a soft-pack lithium battery with high safety performance, including a lithium battery body, wherein the lithium battery body includes an outer shell, an aluminum pole ear, and a nickel pole ear, wherein a low-melting-point glue layer is provided at the lower end of the aluminum pole ear and the nickel pole ear, and the outer shell and the aluminum pole ear are connected through the low-melting-point glue layer, and the aluminum pole ear and the nickel pole ear extend into the interior of the outer shell.

[0005] Preferably, the melting point of the low melting point adhesive layer is 100-120°C.

[0006] Preferably, the shell comprises an aluminum-plastic film nylon layer, an aluminum-plastic film aluminum layer and an aluminum-plastic film PP layer, the aluminum-plastic film nylon layer is wrapped around the outer end of the aluminum-plastic film aluminum layer, and the aluminum-plastic film aluminum layer is wrapped around the outer end of the aluminum-plastic film PP layer.

[0007] Preferably, the shape of the shell is cylindrical, the diameter of the shell is 13.2 mm, the height of the shell is 35.5 mm, and the capacity is 350 mAh.

[0008] Preferably, the shell is square in shape, has a thickness of 8.1 mm, a width of 18.5 mm, a height of 29.5 mm, and a capacity of 350 mAh.

[0009] Preferably, the low melting point adhesive layer extends to the outer end of the shell.

[0010] Beneficial effects of the utility model:

[0011] The utility model provides a soft-pack lithium battery with high safety performance, comprising a lithium battery body, wherein the lithium battery body comprises an outer shell, an aluminum pole ear, and a nickel pole ear, wherein the lower ends of the aluminum pole ear and the nickel pole ear are provided with a low-melting point glue layer, wherein the outer shell and the aluminum pole ear are connected, and the outer shell and the nickel pole ear are connected via the low-melting point glue layer, wherein the aluminum pole ear and the nickel pole ear extend into the inner part of the outer shell, and the aluminum pole ear, the nickel pole ear and the outer shell are welded together by using the low-melting point glue layer and a packaging temperature of 130-160° C. When the battery encounters abnormal conditions such as short circuit, high temperature, overcharge, etc., and the internal temperature reaches above 100° C., the low-melting point glue layer on the aluminum pole ear and the low-melting point glue layer on the nickel pole ear will both enter a molten state, causing the packaging to lose strength, and the heat and gas generated inside the battery will be discharged, thereby effectively preventing the battery from catching fire and exploding. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a cross-sectional view of the utility model.

[0015] The reference numerals are:

[0016] 1. Lithium battery body; 2. Shell; 3. Aluminum tabs; 4. Nickel tabs; 5. Low melting point adhesive layer; 6. Aluminum-plastic film nylon layer; 7. Aluminum-plastic film aluminum layer; 8. Aluminum-plastic film PP layer. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0020] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0021] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] like Figure 1-2 As shown, a soft-pack lithium battery with safety performance includes a lithium battery body 1, wherein the lithium battery body 1 includes a shell 2, an aluminum pole ear 3, and a nickel pole ear 4, wherein a low-melting point glue layer 5 is arranged at the lower end of the aluminum pole ear 3 and the nickel pole ear 4, wherein the shell 2 and the aluminum pole ear 3, and the shell 2 and the nickel pole ear 4 are connected through the low-melting point glue layer 5, wherein the aluminum pole ear 3 and the nickel pole ear 4 extend into the inside of the shell 2, and the aluminum pole ear 3, the nickel pole ear 4 and the shell 2 are welded together by the low-melting point glue layer 5 and the packaging temperature of 130-160°C. When the battery encounters abnormal conditions such as short circuit, high temperature, overcharge, etc., and the internal temperature reaches above 100°C, the low-melting point glue layer 5 on the aluminum pole ear 3 and the low-melting point glue layer 5 on the nickel pole ear 4 will both enter a molten state, causing the packaging to lose strength, and the heat and gas generated inside the battery are discharged, thereby effectively preventing the battery from catching fire and exploding.

[0024] like Figure 1-2 As shown, in this embodiment, the melting point of the low melting point adhesive layer 5 is 100-120° C., specifically, a low melting point adhesive layer 5 with a melting point of 110° C. can be used.

[0025] like Figure 2 As shown, in this embodiment, the shell 2 includes an aluminum-plastic film nylon layer 6, an aluminum-plastic film aluminum layer 7 and an aluminum-plastic film PP layer. The aluminum-plastic film nylon layer 6 is wrapped around the outer end of the aluminum-plastic film aluminum layer 7, and the aluminum-plastic film aluminum layer 7 is wrapped around the outer end of the aluminum-plastic film PP layer. The thickness of the aluminum-plastic film nylon layer 6, the thickness of the aluminum-plastic film aluminum layer 7 and the thickness of the aluminum-plastic film PP layer can be selected according to needs.

[0026] In this embodiment, the shape of the shell 2 is cylindrical, the diameter of the shell 2 is 13.2 mm, the height of the shell 2 is 35.5 mm, and the capacity is 350 mAh.

[0027] In another embodiment, the shape of the shell 2 is square, the thickness of the shell 2 is 8.1 mm, the width of the shell 2 is 18.5 mm, the height is 29.5 mm, and the capacity is 350 mAh.

[0028] like Figure 1 As shown, in this embodiment, in order to ensure that the heat and gas generated inside the lithium battery are discharged in time, the low melting point glue layer 5 extends to the outer end of the shell 2.

[0029] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A soft-pack lithium battery with safety performance, characterized in that: It includes a lithium battery body, which includes an outer shell, an aluminum pole ear, and a nickel pole ear. A low-melting-point glue layer is provided at the lower end of the aluminum pole ear and the nickel pole ear. The outer shell and the aluminum pole ear are connected, and the outer shell and the nickel pole ear are connected through the low-melting-point glue layer. The aluminum pole ear and the nickel pole ear extend into the interior of the outer shell.

2. A soft-pack lithium battery with high safety performance according to claim 1, characterized in that: The melting point of the low melting point adhesive layer is 100-120°C.

3. A soft-pack lithium battery with high safety performance according to claim 1, characterized in that: The shell comprises an aluminum-plastic film nylon layer, an aluminum-plastic film aluminum layer and an aluminum-plastic film PP layer. The aluminum-plastic film nylon layer is wrapped around the outer end of the aluminum-plastic film aluminum layer, and the aluminum-plastic film aluminum layer is wrapped around the outer end of the aluminum-plastic film PP layer.

4. The safety-performance soft-pack lithium battery according to claim 1, characterized in that: The shape of the shell is cylindrical, the diameter of the shell is 13.2 mm, the height of the shell is 35.5 mm, and the capacity is 350 mAh.

5. The soft-pack lithium battery with high safety performance according to claim 1, characterized in that: The shape of the shell is square, the thickness of the shell is 8.1 mm, the width of the shell is 18.5 mm, the height is 29.5 mm, and the capacity is 350 mAh.

6. The safety-performance soft-pack lithium battery according to claim 1, characterized in that: The low melting point adhesive layer extends to the outer end of the shell.

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