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PPTC (polymeric positive temperature coefficient) overcurrent protection element for high-current lithium battery and manufacturing method thereof

A technology for overcurrent protection components and lithium batteries, which is used in resistance manufacturing, electrical components, and current-responsive resistors. , The effect of high production efficiency and low resistance value

Inactive Publication Date: 2014-04-30
SHENZHEN HUIRUI ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the maintenance current of the current conventional ring PPTC devices generally does not exceed 5A, and can only be used for overcurrent and overtemperature protection of existing lithium batteries with low battery capacity and low output current.
The reason is that to achieve a higher holding current for ring PPTC, PPTC needs to have a small resistance value, but conventional ring PPTC uses carbon black as conductive particles, and carbon black itself has a higher resistance The rate limits the PPTC device can not achieve very low resistance

Method used

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  • PPTC (polymeric positive temperature coefficient) overcurrent protection element for high-current lithium battery and manufacturing method thereof
  • PPTC (polymeric positive temperature coefficient) overcurrent protection element for high-current lithium battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 20.0wt% high-density polyethylene HDPE (BU007, melt index: 0.7g / 10min, density 0.97g / cm 3 , Mitsubishi Company), 3.0wt% maleic anhydride grafted polyethylene (Grafted-PE, HD900E, grafting rate 1.2 wt%, Nanjing Huadu Technology Company), 75.0wt% titanium carbide powder (TiC-1, fee Grain size 2~4μm, ρ=61μΩ.cm, density 4.93 g / cm 3 ), 2.0wt% conductive carbon black (Raven 430, particle size 82nm, DBP value 78cm 3 / 100g, Columbian Corporation).

[0034] Weigh according to the above mass ratio, and add high-density polyethylene (HDPE) and maleic anhydride grafted polyethylene (Grafted-PE) into the internal mixer with a set temperature of 160°C and a speed of 30r / min in sequence. Banburying for 4 minutes until melting, then adding conductive carbon black and banburying for 1 minute, finally adding titanium carbide ceramic powder, banburying for 15 minutes, and discharging to obtain a conductive material with PTC characteristics.

[0035] Pull the above-mentioned PPTC conduc...

Embodiment 2

[0038] The PPTC element was manufactured in the same manner as described in Example 1, but with 85.7wt% titanium carbide powder (TiC-2, Fibonacci particle size 1~1.5μm, ρ=61μΩ.cm, density 4.93 g / cm 3 ) to replace the 75.0wt% titanium carbide powder (TiC-1) in Example 1 as the conductive filler. Correspondingly, the content of high-density polyethylene (HDPE) was changed from 20.0t% to 11.4wt%, the content of maleic anhydride grafted HDPE (Grafted-PE) was changed from 3.0wt% to 1.7wt%, and the content of conductive carbon black The content was changed from 2.0wt% to 1.1wt%. The physical properties of the PPTC element were tested in the same manner as described in Example 1, and the results are listed in Table 2.

Embodiment 3

[0040] Manufacture the PPTC element in the same manner as described in Example 2, but TiC-2 type titanium carbide powder (Fisher particle size 1~1.5μm, ρ=61μΩ.cm, density 4.93 g / cm 3 ) content was changed from 85.7wt% to 87.5wt%. Correspondingly, the content of high-density polyethylene (HDPE) was changed from 11.4t% to 10.0wt%, the content of maleic anhydride grafted HDPE (Grafted-PE) was changed from 1.7wt% to 1.0wt%, and the content of conductive carbon black The content was changed from 1.1wt% to 1.0wt%. The physical properties of the PPTC element were tested in the same manner as described in Example 1, and the results are listed in Table 2.

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Abstract

The invention discloses a PPTC (polymeric positive temperature coefficient) overcurrent protection element for a high-current lithium battery, which comprises a circular PPTC conductive material layer and metal foils fixed on the upper surface and lower surface of the PPTC conductive material layer; the PPTC conductive material layer comprises 4-20% of crystalline polymer, 0.5-10% of interfacial compatilizer, 75-95% of conductive ceramic powder and 0.1-5% of conductive carbon black all by mass; the volume resistivity of the PPTC conductive material layer is lower than 0.05(omega).cm. The PPTC protection element disclosed by the invention has the advantages of low resistance, high holding current and good resistance stability so as to provide good overcurrent protection on a cylindrical lithium battery with high capacity and high current output.

Description

technical field [0001] The invention relates to the technical field of positive temperature coefficient (Positive temperature coefficient, PTC) overcurrent protection components, in particular to a PPTC overcurrent protection component for high-current lithium batteries and a manufacturing method thereof. Background technique [0002] PPTC is the abbreviation of polymer positive temperature coefficient thermistor. It is an overcurrent protection element that uses the positive resistance temperature characteristic of a conductive polymer that changes conductivity through thermal expansion to switch on and off the circuit. The PPTC protection element is made of a conductive polymer layer mixed with a special formula of plastic and conductive particles sandwiched between metal foils, which can limit the current protection of the circuit when the circuit current is too large and the temperature is too high. At normal temperatures, these conductive particles form low-resistance c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C7/13H01C17/00
Inventor 李大军徐行涛朱建娟
Owner SHENZHEN HUIRUI ELECTRONICS MATERIALS