PTC (Positive Temperature Coefficient) protection element capable of maintaining ultralarge current

A technology for protecting components and currents, applied in the field of PTC protection components, can solve the problems of not meeting the safety development requirements of power battery packs and energy storage battery packs, and being difficult to replace, and achieves low room temperature resistivity, stable performance, and high withstand voltage level. Effect
CN105139984AInactive Publication Date: 2015-12-09SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
Publication Date
2015-12-09
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

The invention discloses a PTC (Positive Temperature Coefficient) protection element capable of maintaining ultralarge current, which comprises a first external conducting metal pin, a second external conducting metal pin and a resistance PTC chip, wherein the resistance PTC chip is arranged between the first external conducting metal pin and the second external conducting metal pin; the resistance PTC chip comprises (1) at least one crystallinity high polymer material; (2) a conductive filler dispersed in the crystallinity high polymer material, wherein the mass resistivity of the conductive filler is lower than 200[mu]omega.cm, heat conductivity is larger than 10W / (m.k), the particle size is between 0.1[mu]m to 30[mu]m and D50 is not larger than 20[mu]m; (3) and at least two metal electrode foils, wherein the first / second external conducting metal pin is respectively connected to the electrode foils at two faces of the PTC chip. The PTC thermal sensitive element has ultralow electrical resistance property, discharging of high voltage and large current is realized by low specific resistance and high thermal conductivity of the material while overtemperature protection under small current is realized, and application in an accumulator of an electric bicycle is realized.
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Description

technical field

[0001] The invention relates to a PTC protection element capable of maintaining an ultra-high current to support new energy vehicle power batteries, has ultra-low resistance, high voltage bearing capacity, and can achieve low trigger temperature while having an ultra-large sustaining current. Background technique

[0002] Conductive composite materials with a positive temperature coefficient of resistance can maintain an extremely low resistance value at normal temperatures, and have the characteristics of being sensitive to temperature changes, that is, when an overcurrent or overtemperature occurs in the circuit, its resistance will instantly increase to A high resistance value makes the circuit in an open circuit state to achieve the purpose of protecting circuit components. Therefore, a conductive composite material with a positive temperature coefficient of resistance can be connected to the circuit as a material for the current sensing element. Such ma...

Claims

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