CN102522171A - PTC (positive temperature coefficient) ring production method - Google Patents
PTC (positive temperature coefficient) ring production method Download PDFInfo
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- CN102522171A CN102522171A CN2011104570674A CN201110457067A CN102522171A CN 102522171 A CN102522171 A CN 102522171A CN 2011104570674 A CN2011104570674 A CN 2011104570674A CN 201110457067 A CN201110457067 A CN 201110457067A CN 102522171 A CN102522171 A CN 102522171A
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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
The present invention relates to the manufacturing approach of a kind of annulus PTC, be used for the secondary cell excess temperature, overcurrent protection is used protection component.
Background technology
Has positive temperature coefficient (Positive Temperature Coefficient; PTC) resistance of the conducing composite material of characteristic has the sharp characteristic of variations in temperature reaction, can be used as the material of current sensitive element, and has been widely used on current protection element or the circuit element at present.Positive temperature coefficient overcurrent protection element (PTC) based on the macromolecule core is widely applied in the various fields.Annulus PTC is mainly used on the cylindrical lithium ion battery such as notebook (as 18650) battery being carried out overcurrent and overheating protection, at home and abroad has a wide range of applications, and estimates that year consumption is more than 1,000,000,000.
The high molecular PTC conducing composite material has crystalline polymer by one or more and conductive filler is formed, and conductive filler is dispersed in the said crystalline polymer, and the production technology of high molecular PTC is following at present:
Confected materials after the banbury banburying, is made into chip with mill, thereby obtains the PTC sandwich layer, again the vacuum press pressing is used on PTC sandwich layer two sides and tinsel, make the PTC composite sheet.Above-mentioned compound sheet PTC core is struck out the chip of target size, and punching is carried out annealing in process to chip after accomplishing, and uses gamma-rays (Co again
60) or electron beam to irradiate crosslinked, make finished product.
Above method production efficiency is too low, has been not suitable for producing in enormous quantities; The cylindrical lithium battery mode that adopts block to use with annulus PTC product in addition, need be on chip the weld metal conductive pin, therefore need a kind of method for manufacturing that is more suitable for to come the production of corresponding annulus PTC.
Summary of the invention
Main purpose of the present invention provides the manufacturing approach of a kind of annulus PTC, under the preceding topic that guarantees electrical characteristic, can enhance productivity.
The present invention provides the preparation method of a kind of annulus PTC; The overall dimension of annulus PTC is formed circular ring plate by D outer diameter, inner diameter d and thickness; Comprise two tinsels and a ptc layer; It is characterized in that: the roughening of two tinsels surface contact with the ptc layer direct physical, said ptc layer between said two tinsels, its up and down tinsel and up and down the metallic nickel sheet through being assembled into assembly of formation in the battery cap; Be connected to form a galvanic circle with power supply, its preparation process is in regular turn:
The first, annulus PTC is a high molecular based PTC, adopts the double screw extruder extruding pelletization, again with making material for making clothes with single screw extrusion machine extruding sheet sandwich layer;
The second, with the sheet sandwich layer up and down two compound with the conducting metal paillon foil through pressure roller, and cool off through chill roll;
The 3rd, with composite sheet with gamma-rays (Co
60) or the electron beam irradiation friendship, the couplet irradiation dose is 15 ~ 35Mrad;
The 4th, the composite sheet of cross-linking radiation strikes out the circular chip of target size;
The 5th, circular chip carried out thermal shock after, promptly make said annulus PTC finished product.
On the such scheme basis; In the first step, described double screw extruder is a parallel double-screw extruder, and each section temperature setting range is 160 ~ 190 ℃; Each of said single screw extrusion machine section temperature setting range is 180 ~ 230 ℃, and die head temperature is set at 190 ~ 210 ℃.
In the prepared over-current protecting element of the present invention, said up and down tinsel can form assembly with metallic gasket, plastic seal ring etc. up and down---block.Block places the inside of cylindrical battery, generally below anode, is present in the galvanic circle, and annulus PTC is worked under over-current state, reaches the effect of protective circuit.
On the such scheme basis, the said material raw material particle size of making is not more than 0.1 millimeter.
On the such scheme basis; In second step; Said compound use pressure roller is the heating steel rider, 150 ~ 300 millimeters in roller footpath, and the temperature setting range is 140 ~ 200 ℃; Described chill roll roller directly for being not less than 500 millimeters, be docile and obedient preface and be by the temperature setting range: 140 ~ 160 ℃, 110 ~ 140 ℃, 35 ℃ following ambient temperatures.
On the such scheme basis, the tension force of said compound tense tinsel is 0 ~ 2 kilogram.
On the such scheme basis, in the 5th step, said thermal shock condition is: hot case 85 ℃, 45 minutes/ice chest-45 ℃, 45 minutes, and totally 6 times, to enter from hot case at every turn, ice chest comes out.
Description of drawings
A kind of annulus PTC of Fig. 1 the present invention;
Fig. 2 composite sheet of the present invention is made production line;
Label is among the figure:
10-annulus PTC;
1,2-upper and lower pressure roller; 3,4,5-first, second, third chill roll.
Specific embodiment
The preparation method of a kind of annulus PTC; Annulus PTC is as shown in Figure 1; Overall dimension is formed circular ring plate by D outer diameter, inner diameter d and thickness, comprises two tinsels and a ptc layer, and wherein: the roughening surface of two tinsels contacts with the ptc layer direct physical; Said ptc layer is between said two tinsels; Its up and down tinsel form an assembly with metallic nickel sheet up and down in the battery cap through being assembled into, be connected to form a galvanic circle with power supply, its preparation process is in regular turn:
The first, annulus PTC is a high molecular based PTC, and each component is by the prescription batch weighing, as bulk goods is arranged in the raw material, then it is worn into behind the powder of particle diameter below 0.1 millimeter batch weighing again; The material for preparing is carried out the physics premixed with mixer, 15 ~ 40 minutes time; With the even extruding pelletization of twin-screw melting mixing, each section of twin-screw temperature is set at 160 ~ 190 ℃ with the material that mixes; Again with making material for making clothes with single screw extrusion machine extruding sheet sandwich layer, wherein, with above-mentioned institute granulation material with single screw extrusion machine through die head extruding sheet sandwich layer, single screw zones temperature is set at 180 ~ 230 ℃, die head temperature is set at 190 ~ 210 ℃;
The second, with the sheet sandwich layer up and down two compound with the conducting metal paillon foil through pressure roller, and cool off through chill roll; As shown in Figure 2, make two of sheet sandwich layers compound with pressure roller 1 and pressure roller 2,140 ~ 200 ℃ of roller temperature controls with the tinsel that involves; Pressure roller is a steel rider; 150 ~ 300 millimeters in roller footpath, tinsel unwinding tension control 0 ~ 2 kilogram is adjusted according to the tinsel situation; Composite sheet is again through 3,4,5 coolings of first, second, third chill roll; Three chill rolls are steel rider bag roller; The roller footpath is more than 500 millimeters, and three roll temperatures successively decrease successively, and sequencing is followed successively by 140 ~ 160 ℃, 110 ~ 140 ℃ to the temperature setting range, normal temperature below 35 ℃ by illustrating;
The 3rd, composite sheet is cut into target size, with gamma-rays (Co
60) or electron beam to irradiate crosslinked, irradiation dose is 15 ~ 35Mrad;
The 4th, the composite sheet of cross-linking radiation strikes out the circular chip of target size;
The 5th, circular chip carried out thermal shock after, promptly make said annulus PTC finished product, wherein, punching is accomplished the back chip is carried out the alternating hot and cold processing, hot case condition is 85 ℃, 45 minutes; The ice chest condition is-45 ℃, 45 minutes, and totally 6 times, each hot case advances, and ice chest goes out.
Annulus PTC production technology setup parameter used in the present invention is shown in table one.
Manufacturing process is following: will be by the load weighted material premix of known formulations 30min, again by table one technological parameter carry out double-screw extruding pelletizing, single screw rod is extruded the integrated compound composite sheet that makes.With gamma-rays (Co
60) or electron beam to irradiate crosslinked, dosage is 15 ~ 35Mrad; The composite sheet that to pass through irradiation is washed into the circular chip of Φ 16.15 * 9.0 with punch press, then it is carried out thermal shock, and condition is 85 ℃, and 45 minutes/-45 ℃, 45 minutes, totally 6 times, hot case advanced, and ice chest goes out.
Table 2 is the embodiment of the obtained annulus overcurrent protection of the present invention components and parts, after placing through the same terms through getting back to resistance test data, PTC intensity, the transition temperature of room temperature after triggering (Trip) next hour.R0 in the table is the initial resistance of said current protection element; R1 is the room temperature resistance of trigger action after one hour under the process 12.5A electric current; SD is the resistance dispersion; Guard time when Ttt is process 12.5A current trigger; PTC intensity is that no current impacts through the logarithm value of the resistance after the variation of ambient temperature triggering with initial resistance value ratio.
Table three is that the quick overcurrent protection components and parts of low temperature of the present invention are comparing through the performance in proof voltage and the anti-testing current.Wherein U=15V is the performance under 15V voltage; U=32V is the performance under 32V voltage; I=40A/1000 time is that it is impacting under the 6s condition through the 40A load current, repeatedly 1000 times performance.
The manufacturing approach of annulus PTC according to the invention is compared with working as former kinds of ripe PTC production technologies, simplifies more, carries out continuity production more easily.Compare with like product on the market, utilize the annulus PTC resistance concentration degree that the method for the invention makes high, have higher PTC intensity, more excellent anti-abnormal voltage performance.
Claims (6)
1. the preparation method of an annulus PTC; The overall dimension of annulus PTC is formed circular ring plate by D outer diameter, inner diameter d and thickness; Comprise two tinsels and a ptc layer; It is characterized in that: the roughening of two tinsels surface contact with the ptc layer direct physical, said ptc layer between said two tinsels, its up and down tinsel and up and down the metallic nickel sheet through being assembled into assembly of formation in the battery cap; Be connected to form a galvanic circle with power supply, its preparation process is in regular turn:
The first, annulus PTC is a high molecular based PTC, adopts the double screw extruder extruding pelletization, again with making material for making clothes with single screw extrusion machine extruding sheet sandwich layer;
The second, with the sheet sandwich layer up and down two compound with the conducting metal paillon foil through pressure roller, and cool off through chill roll;
The 3rd, with composite sheet with gamma-rays (Co
60) or electron beam irradiation, crosslinked irradiation dose is 15 ~ 35Mrad;
The 4th, the composite sheet of cross-linking radiation strikes out the circular chip of target size;
The 5th, circular chip carried out thermal shock after, promptly make said annulus PTC finished product.
2. the preparation method of a kind of annulus PTC according to claim 1; It is characterized in that: in the first step; Described double screw extruder is a parallel double-screw extruder; Each section temperature setting range is 160 ~ 190 ℃, and each of said single screw extrusion machine section temperature setting range is 180 ~ 230 ℃, and die head temperature is set at 190 ~ 210 ℃.
3. the preparation method of a kind of annulus PTC according to claim 1; It is characterized in that: in second step; Said compound use pressure roller is the heating steel rider, 150 ~ 300 millimeters in roller footpath, and the temperature setting range is 140 ~ 200 ℃; Described chill roll roller directly for being not less than 500 millimeters, be docile and obedient preface and be by the temperature setting range: 140 ~ 160 ℃, 110 ~ 140 ℃, 35 ℃ following ambient temperatures.
4. according to the preparation method of claim 1 or 3 described a kind of annulus PTC, it is characterized in that: the tension force of said compound tense tinsel is 0 ~ 2 kilogram.
5. the preparation method of a kind of annulus PTC according to claim 1 is characterized in that: in the 5th step, said thermal shock condition is: hot case 85 ℃, 45 minutes/ice chest-45 ℃, 45 minutes, and totally 6 times, to enter from hot case at every turn, ice chest comes out.
6. the preparation method of a kind of annulus PTC according to claim 1 and 2 is characterized in that: the said material raw material particle size of making is not more than 0.1 millimeter.
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Citations (8)
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| WO1998005503A1 (en) * | 1996-08-01 | 1998-02-12 | Raychem Corporation | Method of making a laminate comprising a conductive polymer composition |
| CN1343560A (en) * | 2000-09-18 | 2002-04-10 | 扬州芬尔机械配件有限公司 | Process for preparing high molecular based PTC material |
| CN101335124A (en) * | 2007-06-29 | 2008-12-31 | 佛山塑料集团股份有限公司 | Polymer PTC heat sensitive material obtained by compound extruding method |
| CN101465185A (en) * | 2007-12-18 | 2009-06-24 | 比亚迪股份有限公司 | Positive temperature coefficient material and thermistor containing the material and preparation method therefore |
| CN101560325A (en) * | 2009-05-26 | 2009-10-21 | 上海科特高分子材料有限公司 | High-temperature resistant PTC electroconductive composition, high-temperature resistant PTC device containing composition and manufacturing method thereof |
| CN101633787A (en) * | 2008-07-25 | 2010-01-27 | 上海科特高分子材料有限公司 | Low-resistivity positive temperature coefficient type conductive polymer composite material and preparation method thereof |
| CN101887766A (en) * | 2010-07-08 | 2010-11-17 | 上海长园维安电子线路保护股份有限公司 | Conductive composite material with resistance positive temperature coefficient and over-current protection element |
| CN102176360A (en) * | 2011-02-22 | 2011-09-07 | 深圳市长园维安电子有限公司 | PTC thermistor and substrate applied therein and manufacturing method thereof |
-
2011
- 2011-12-31 CN CN2011104570674A patent/CN102522171A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998005503A1 (en) * | 1996-08-01 | 1998-02-12 | Raychem Corporation | Method of making a laminate comprising a conductive polymer composition |
| CN1343560A (en) * | 2000-09-18 | 2002-04-10 | 扬州芬尔机械配件有限公司 | Process for preparing high molecular based PTC material |
| CN101335124A (en) * | 2007-06-29 | 2008-12-31 | 佛山塑料集团股份有限公司 | Polymer PTC heat sensitive material obtained by compound extruding method |
| CN101465185A (en) * | 2007-12-18 | 2009-06-24 | 比亚迪股份有限公司 | Positive temperature coefficient material and thermistor containing the material and preparation method therefore |
| CN101633787A (en) * | 2008-07-25 | 2010-01-27 | 上海科特高分子材料有限公司 | Low-resistivity positive temperature coefficient type conductive polymer composite material and preparation method thereof |
| CN101560325A (en) * | 2009-05-26 | 2009-10-21 | 上海科特高分子材料有限公司 | High-temperature resistant PTC electroconductive composition, high-temperature resistant PTC device containing composition and manufacturing method thereof |
| CN101887766A (en) * | 2010-07-08 | 2010-11-17 | 上海长园维安电子线路保护股份有限公司 | Conductive composite material with resistance positive temperature coefficient and over-current protection element |
| CN102176360A (en) * | 2011-02-22 | 2011-09-07 | 深圳市长园维安电子有限公司 | PTC thermistor and substrate applied therein and manufacturing method thereof |
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Address after: Seven road 201202 Shanghai Pudong New Area Shiwan No. 1001 Applicant after: Shanghai Changyuan Wayon Circuit Protection Co., Ltd. Address before: Seven road 201202 Shanghai Pudong New Area Shiwan No. 1001 Applicant before: Shanghai Changyuan Wayon Circuit Protection Co., Ltd. |
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Application publication date: 20120627 |
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