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Overcurrent or continuous current-carrying self-protection tab and manufacturing method thereof

A protection type, tab technology, applied in the field of lithium-ion batteries, can solve problems such as high current overcharge and discharge, thermal runaway, short circuit, etc., to prevent thermal runaway, prevent fire or explosion, and reduce production costs.

Pending Publication Date: 2021-01-19
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the use of lithium-ion batteries, often due to problems such as high-current overcharge or short-circuit, the battery generates a large amount of heat and causes thermal runaway, fire, explosion and other accidents.

Method used

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  • Overcurrent or continuous current-carrying self-protection tab and manufacturing method thereof
  • Overcurrent or continuous current-carrying self-protection tab and manufacturing method thereof
  • Overcurrent or continuous current-carrying self-protection tab and manufacturing method thereof

Examples

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preparation example Construction

[0043] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0044] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0046] Such as image 3 Shown in this example is an overcurrent self-protective tab for a lithium-ion battery. The upper and lower sides of the negative nickel tab sheet with a size of 0.1 mm thick and 6 mm wide are heat-sealed and bonded to polypropylene by high-frequency welding. Ear glue, the total thickness of the ear glue is 0.16mm, the width is 3.5mm, and the length is 10mm. The ear glue divides the negative nickel tab sheet into a protruding end and a welding end; The PTC thermistor (0.08mm thick*3mm wide*4mm long) is welded by ultrasonic welding between the output end and the PACK assembly end (the material is nickel sheet, the size is 0.1mm thick*6mm wide), and the temperature trigger point: 65 ℃); heat-seal and bond a layer of polypropylene protective glue on the surface of the PTC thermistor by hot-pressing. The size of the protective glue is 0.1mm thick*6mm wide*10mm long. Conventional aluminum lugs in the prior art (dimensions: 0.1mm thick*6mm wide).

[0047] The ...

Embodiment 2

[0050] Such as Figure 4 Shown is another implementation diagram of the lithium-ion battery overcurrent self-protection tab of the present invention. The positive electrode is an aluminum tab sheet (size: 0.15mm thick*5mm wide), which is bonded to the polypropylene pole by hot pressing. Ear glue, the aluminum tab sheet is divided into a welding end and a protruding end, wherein the protruding end is connected to the PTC thermistor by laser welding (the size of the PTC thermistor is: 0.15mm thick*3mm wide*3mm long, temperature Trigger point: 90°C), the other end of the PTC thermistor is connected by laser welding and PACK assembly end (size: 0.12mm thick * 5mm wide), and the upper and lower surfaces of the PTC thermistor are bonded by hot pressing Covered with polyethylene protective glue (size: 0.2mm total thickness*7mm width*10mm length), the negative electrode of this embodiment uses a nickel-plated copper tab with a thickness of 0.15mm*5mm width.

[0051] The overcurrent s...

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Abstract

The invention provides an overcurrent or continuous current-carrying self-protection tab of a lithium ion battery and a manufacturing method thereof. A PTC thermistor is welded and introduced betweenan extension end and a PACK assembly end of a metal conductor, and a layer of protective glue is adhered to the surface of the PTC thermistor in a heat sealing manner; when the lithium ion battery isover-current or continuously carries current, the resistance of the PTC thermistor is sharply increased due to a large amount of heat generated by the tabs, so that the current of a loop is quickly reduced to a safe current value, fire or explosion caused by thermal runaway generated by over-current or continuously carrying current of the battery is prevented, and the battery and an assembly areaare protected. In addition, the PTC thermistor of the overcurrent or continuous current-carrying self-protection tab can omit a breaker or PTC process independently introduced in the battery PACK process, so that the production process is greatly simplified, and the corresponding production cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an overcurrent or continuous current-carrying self-protection tab and a manufacturing method thereof. Background technique [0002] Due to the advantages of high energy density, high voltage, and long cycle times, lithium-ion batteries have been widely used in consumer electronics, electric vehicles, power tools and other products. However, during the use of lithium-ion batteries, problems such as overcharge and discharge of large currents or short circuits often cause the batteries to generate a large amount of heat and cause thermal runaway, fires, explosions and other accidents. Contents of the invention [0003] In order to solve the above problems, it was proposed to seal the PTC thermistor in the tab glue layer of the rolled nickel tab, thereby improving the safety performance of the soft-packed lithium-ion battery and increasing the probability of passing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/54H01M10/42H01M10/04H01M10/0525
CPCH01M10/04H01M10/0525H01M10/4235Y02E60/10Y02P70/50
Inventor 林文荣李素丽徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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