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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

Inactive Publication Date: 2015-12-09
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the protective components currently used in the market are all one-time fuses, which are difficult to replace after a fault occurs.
However, the current recoverable PTC-type battery protection components can withstand a voltage of only 6-24V, and can maintain a maximum current of only 10A; it is far from meeting the safe development needs of power battery packs and energy storage battery packs.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 Schematic diagram of the structure of the PTC chip and figure 2As shown in the figure of the PTC element that can maintain a large current, a PTC protection element that can maintain a large current includes a first external conductive metal pin, a second external conductive metal pin, and a conductive metal pin located on the first and second external conductive The resistance between the metal pins is a positive temperature effect chip (PTC), and the resistance of the PTC protection element is lower than 2.0mΩ, wherein,

[0040] (a) At least one chip with a positive temperature effect of resistance, the chip is composed of a composite material layer 11 with a positive temperature effect of resistance, and the first and second electrode foils closely bonded to the upper and lower surfaces of the composite material layer 11 with a positive temperature effect of resistance. , the lower metal electrode foils 121, 122 form a resistance positive temperatu...

Embodiment 2

[0047] Others are the same as in Example 1, on the basis of Example 1, the 65% copper alloy material used in the electrode foil and pins is replaced with an 85% copper alloy material, the resistivity is 4.7μΩ.cm, and the thermal conductivity is 159W / ( m.K).

Embodiment 3

[0049] Others are the same as in Example 1, on the basis of Example 1, the 65% copper alloy material used in the electrode foil and pins is replaced with a 95% copper alloy material, the resistivity is 3.1 μΩ.cm, and the thermal conductivity is 243W / ( m.K).

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C7/13C08L23/06C08K3/14
Inventor 方勇刘兵杨铨铨吴国臣
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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