PTC (positive temperature coefficient) ring production method

A ring, metal foil technology, applied in the direction of current-responsive resistors, resistors with positive temperature coefficient, etc., can solve the problems of unsuitability for mass production and low production efficiency

Inactive Publication Date: 2012-06-27
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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Problems solved by technology

[0005] The production efficiency of the above method is too low, and it is no longer suitable for mass production; in addition, the circular PTC product for cylindrical lithium batteries adopts the method of capping, and does not need to weld metal conductive pins on the chip, so a more suitable manufacturing method is needed. To correspond to the production of ring PTC

Method used

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  • PTC (positive temperature coefficient) ring production method
  • PTC (positive temperature coefficient) ring production method
  • PTC (positive temperature coefficient) ring production method

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Embodiment Construction

[0024] A kind of preparation method of circular PTC, circular PTC such as figure 1 As shown, the outer dimension is composed of outer diameter D, inner diameter d and thickness of a ring piece, including two metal foils and a PTC material layer, wherein: the rough surface of the two metal foils is in direct physical contact with the PTC material layer, The PTC material layer is interposed between the two metal foils. The upper and lower metal foils and the upper and lower metal nickel sheets are assembled into a battery cap to form a component, and connected to a power supply to form a conductive circuit. The preparation steps are in sequence for:

[0025] First, the ring PTC is a polymer-based PTC, and each component is weighed according to the formula. If there is a granular material in the raw material, it should be ground into a powder with a particle size of less than 0.1 mm before weighing; The material is pre-mixed physically with a mixer for 15-40 minutes; the mixed ...

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Abstract

The invention provides a PTC (positive temperature coefficient) ring production method. A PTC ring is a circular plate in a dimension of the outer diameter D, the inner diameter d and the thickness and comprises two metal foils and a PTC material layer. The PTC material layer is positioned between the two metal foils, and the upper metal foil, the lower metal foil, an upper metal nickel and a lower metal nickel are assembled into a battery cap to form a component which is connected with a power source to form a conductive loop. The production method includes steps: firstly, using macromolecule-based PTC as the PTC ring, using a twin-screw extruder for extruding and pelleting, and using a single-screw extruder to extrude the generated pellets into a laminated core; secondly, compositing the laminated core with the conductive metal foils, and cooling, thirdly, using gamma-ray (Co60) or electron beams to irradiate the composite plate; fourthly, stamping the irradiated cross-linked composite plate into a circular chip in a target dimension; and fifthly, subjecting the circular chip to thermal shock to obtain the finished PTC ring.

Description

technical field [0001] The invention relates to a manufacturing method of a ring PTC, which is used as a protective element for secondary battery over-temperature and over-current protection. Background technique [0002] The resistance of conductive composite materials with positive temperature coefficient (Positive Temperature Coefficient; PTC) has the characteristics of sensitive response to temperature changes, which can be used as the material of current sensitive components, and has been widely used in current protection components or circuit components. Positive temperature coefficient overcurrent protection components (PTC) based on polymer core materials have been widely used in many fields. Ring PTC is mainly used in cylindrical lithium-ion batteries such as notebooks (such as 18650) to protect the battery from overcurrent and overheating. It has been widely used at home and abroad, and the annual consumption is expected to be more than 1 billion pieces. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C7/13
Inventor 孙天举章小飞刘利锋
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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