Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of novel double-substrate PPTC for lithium batteries

A lithium battery and substrate technology, applied in secondary battery repair/maintenance, coating, etc., can solve problems affecting the performance of lithium batteries, achieve the effect of meeting the overload temperature and ensuring the product's withstand voltage

Inactive Publication Date: 2020-02-14
芜湖凯龙电子科技有限公司
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, it is only possible to solve the problem of high temperature by selecting PPTC with high internal resistance and installing it on the lithium battery, but too large internal resistance will also affect other performances of the lithium battery.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of novel double-substrate PPTC for lithium batteries
  • Preparation method of novel double-substrate PPTC for lithium batteries
  • Preparation method of novel double-substrate PPTC for lithium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of novel dual-matrix lithium battery PPTC comprises the steps:

[0023] (1) Low-density polyethylene and high-density polyethylene are configured according to the ratio of 2:3, and a certain amount of conductive carbon black is mixed, and these three materials are stirred at a high speed and mixed evenly to obtain a mixture A;

[0024] (2) Take the mixture A and put it into an internal mixer for internal mixing, heat the internal mixer to 220°C, and mix for 25 minutes. After mixing, granulate through a crusher, and then use a single-screw compounding equipment for electrode compounding. The copper foil is compounded on the upper and lower sides of the extruded strip;

[0025] (3) Punching and irradiating the composite core material to obtain the desired product;

[0026] The ratio of the above-mentioned low-density polyethylene, high-density polyethylene, and conductive carbon black is as follows (by mass percentage): 20% of low-density pol...

Embodiment 2

[0030] A kind of preparation method of novel dual-matrix lithium battery PPTC comprises the steps:

[0031] (1) Low-density polyethylene and high-density polyethylene are configured according to the ratio of 2:3, and a certain amount of conductive carbon black is mixed, and these three materials are stirred at a high speed and mixed evenly to obtain a mixture A;

[0032] (2) Take the mixture A and put it into an internal mixer for internal mixing, heat the internal mixer to 220°C, and mix for 25 minutes. After mixing, granulate through a crusher, and then use a single-screw compounding equipment for electrode compounding. The copper foil is compounded on the upper and lower sides of the extruded strip;

[0033] (3) Punching and irradiating the composite core material to obtain the desired product;

[0034] The ratio of the above-mentioned low-density polyethylene, high-density polyethylene, and conductive carbon black is as follows (by mass percentage): 14% of low-density pol...

Embodiment 3

[0038] A kind of preparation method of novel dual-matrix lithium battery PPTC comprises the steps:

[0039] (1) Low-density polyethylene and high-density polyethylene are configured according to the ratio of 2:3, and a certain amount of conductive carbon black is mixed, and these three materials are stirred at a high speed and mixed evenly to obtain a mixture A;

[0040] (2) Take the mixture A and put it into an internal mixer for internal mixing, heat the internal mixer to 220°C, and mix for 25 minutes. After mixing, granulate through a crusher, and then use a single-screw compounding equipment for electrode compounding. The copper foil is compounded on the upper and lower sides of the extruded strip;

[0041] (3) Punching and irradiating the composite core material to obtain the desired product;

[0042] The above-mentioned low-density polyethylene, high-density polyethylene, and conductive carbon black have the following proportioning ratio (by mass percentage): 18% of low...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
Login to View More

Abstract

Relating to the technical field of PPTC manufacturing, the invention discloses a preparation method of a novel double-substrate PPTC for lithium batteries. The method includes the steps of raw material mixing, banburying, compound forming and the like. The PPTC for low-temperature lithium batteries provided by the invention adopts a low-density polyethylene and high-density polyethylene double-substrate form in materials, the melting point of the low-density polyethylene is low (70-80DEG C), and the pressure resistance of the low-density polyethylene is poor, so that adoption of the double-substrate form is necessary, the temperature of lithium batteries can be guaranteed below 95DEG C under an overload state, and the voltage resistance of the product can also be guaranteed. The two substrates are prepared according to certain proportion, and then are fully blended together through mixing process, and then a proper proportion of carbon black is added, so that the prepared PPTC finishedproduct can ensure the temperature of lithium batteries at or below 90DEG C, thus meeting the requirement of the lithium battery industry for overload temperature.

Description

technical field [0001] The invention belongs to the technical field of PPTC manufacturing, and in particular relates to a novel preparation method of PPTC for double-matrix lithium batteries. Background technique [0002] At present, the PPTC for lithium batteries in the domestic and foreign markets is mainly ring-shaped PPTC or strip-shaped PPTC, which are mainly used in consumer appliances such as mobile phone batteries and notebook batteries. The materials of these PPTCs are mainly composed of high-density polyethylene (HDPE) and carbon black. In use, once PPTC is impacted by abnormal current, it will increase its own resistance to disconnect the current protection device. In this process, because the melting temperature of high-density polyethylene in the material is relatively high (above 125°C), PPTC’s The temperature may also reach this temperature, but in most lithium battery industry standards, the temperature of a lithium battery must not exceed 95°C after being ov...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K3/04B29C48/154B29C48/285H01M10/42
CPCB29C48/154B29C48/288C08K2201/001C08L23/06C08L2205/025C08L2207/062C08L2207/066H01M10/42C08K3/04Y02E60/10
Inventor 张大力徐敬东
Owner 芜湖凯龙电子科技有限公司