CN107858488A - A kind of processing method of lithium battery stainless steel casing - Google Patents
A kind of processing method of lithium battery stainless steel casing Download PDFInfo
- Publication number
- CN107858488A CN107858488A CN201711217121.1A CN201711217121A CN107858488A CN 107858488 A CN107858488 A CN 107858488A CN 201711217121 A CN201711217121 A CN 201711217121A CN 107858488 A CN107858488 A CN 107858488A
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- steel casing
- lithium battery
- passed
- hydrogen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
Abstract
The invention belongs to lithium battery stainless steel casing processing technique field; more particularly to a kind of processing method of lithium battery stainless steel casing; the lithium battery stainless steel casing has thickness to be formed for the thick SUS304 stainless steel materials punching stretch of 0.35 0.55mm; its annealing process comprises the following steps, annealing, ion nitriding furnace processing and correction and cooling in protective gas.The present invention has advantages below compared with prior art：Using method in the present invention; it be able to will not be aoxidized on surface while stress is eliminated; its surface forms one layer of fine and close protective film, it is possible to increase material housing hardness and corrosion resistance, surface stain resistance are strong; poisonous and harmful substance will not be produced in production technology; resulting materials stress is uniform simultaneously, eliminates acid cleaning process, avoids environmental pollution; its process condition is controllable, is advantageous to large-scale production.
Description
Technical field
The invention belongs to lithium battery stainless steel casing processing technique field, and in particular to a kind of lithium battery stainless steel casing
Processing method.
Background technology
Column type stainless steel li battery shell can produce stress after being molded due to stamped stretch process, therefore need annealed place
Reason, traditional processing method be stretch once, annealing and pickling once, and will typically pass through four stretch process, that is to say, that often
Individual shell, which will pass through four annealing and pickling processes, can obtain finished product, and thus, stainless steel casing finished product is easy because of multiple annealing and pickling
Piece surface oxide layer is caused to come off, it is more serious that overpickling will also result in its surface defect, need to pass through sanding and polishing process
To make up, also therefore more difficult control part size, moreover, substantial amounts of pickle liquor can pollute to environment, therefore, it is necessary to
Further studied how reasonably to handle stainless steel li battery shell.
The content of the invention
The purpose of the present invention is to be directed to the problem of existing, there is provided a kind of processing method of lithium battery stainless steel casing.
The present invention is achieved by the following technical solutions：A kind of processing method of lithium battery stainless steel casing, the lithium
Battery stainless steel casing has thickness to be formed for the thick SUS304 stainless steel materials punching stretch of 0.35-0.55mm, its annealing process
Comprise the following steps：
（1）Protective gas is full of in continuous bright annealing furnace, the stainless steel casing for making the drawing and forming is in temperature
Annealed under conditions of 400-450 DEG C 30-40 minutes；
（2）The stainless steel casing of the drawing and forming after above-mentioned processing is put into ion nitriding furnace, is passed through hydrogen, Ran Houqi
Brightness heats up, and after being warming up to 650 DEG C, is passed through nitrogen, and the volume ratio for adjusting nitrogen and hydrogen is 1:2.5-3.5 furnace pressure is
200-400Pa, 1-1.5 hours are handled under conditions of being 620-640 DEG C in temperature；
（3）Step（2）After the completion of close nitrogen, continue to be passed through hydrogen, reduce electric current and magnitude of voltage, after being cooled to 340-360 DEG C
It is passed through into excessively dry air and carries out surface oxidation, after aoxidizing 15-25 minutes, stopping is passed through air, closes ion nitriding furnace, right
Stainless steel casing is corrected, and continues to be passed through hydrogen, stainless steel casing is cooled to room temperature.
As further improvement of these options, the protective gas is ammonolysis craft gas, pure nitrogen gas or pure hydrogen.
As further improvement of these options, the volume ratio of nitrogen and hydrogen is 1 in the ammonolysis craft gas:3.
As further improvement of these options, the water content of the air of the drying is aqueous in every litres of air
0.35-0.65g。
The present invention has advantages below compared with prior art：, can be while stress be eliminated using method in the present invention
Surface will not aoxidize, and its surface forms one layer of fine and close protective film, it is possible to increase material housing hardness and corrosion resistance,
Surface stain resistance is strong, poisonous and harmful substance will not be produced in production technology, while resulting materials stress is uniform, eliminates pickling
Process, environmental pollution is avoided, its process condition is controllable, is advantageous to large-scale production.
Embodiment
Embodiment 1
A kind of processing method of lithium battery stainless steel casing, the lithium battery stainless steel casing have thickness for 0.45mm thickness
SUS304 stainless steel materials punching stretch forms, and its annealing process comprises the following steps：
（1）Protective gas is full of in continuous bright annealing furnace, makes the stainless steel casing of the drawing and forming in temperature be 420
Annealed 35 minutes under conditions of DEG C；
（2）The stainless steel casing of the drawing and forming after above-mentioned processing is put into ion nitriding furnace, is passed through hydrogen, Ran Houqi
Brightness heats up, and after being warming up to 650 DEG C, is passed through nitrogen, and the volume ratio for adjusting nitrogen and hydrogen is 1:3, furnace pressure 300Pa,
Temperature is handled 1.2 hours under conditions of being 630 DEG C；
（3）Step（2）After the completion of close nitrogen, continue to be passed through hydrogen, reduce electric current and magnitude of voltage, be passed through after being cooled to 350 DEG C
Entered the air dried and carry out surface oxidation, after aoxidizing 20 minutes, stopping is passed through air, ion nitriding furnace is closed, to stainless steel
Shell is corrected, and continues to be passed through hydrogen, stainless steel casing is cooled to room temperature.
Wherein, the protective gas is ammonolysis craft gas, and the volume ratio of nitrogen and hydrogen is 1 in the ammonolysis craft gas:
3。
Wherein, aqueous 0.50g during the water content of the air of the drying is per litres of air.
After testing, its case hardness improves 47.2% than SUS304 stainless steel materials, and corrosion resistance is preferable, dimensionally stable
Property is good, meets using standard.
Embodiment 2
A kind of processing method of lithium battery stainless steel casing, the lithium battery stainless steel casing have thickness for 0.35mm thickness
SUS304 stainless steel materials punching stretch forms, and its annealing process comprises the following steps：
（1）Protective gas is full of in continuous bright annealing furnace, makes the stainless steel casing of the drawing and forming in temperature be 450
Annealed 30 minutes under conditions of DEG C；
（2）The stainless steel casing of the drawing and forming after above-mentioned processing is put into ion nitriding furnace, is passed through hydrogen, Ran Houqi
Brightness heats up, and after being warming up to 650 DEG C, is passed through nitrogen, and the volume ratio for adjusting nitrogen and hydrogen is 1:2.5, furnace pressure 400Pa,
Handled 1.5 hours under conditions of being 620 DEG C in temperature；
（3）Step（2）After the completion of close nitrogen, continue to be passed through hydrogen, reduce electric current and magnitude of voltage, be passed through after being cooled to 360 DEG C
Entered the air dried and carry out surface oxidation, after aoxidizing 15 minutes, stopping is passed through air, ion nitriding furnace is closed, to stainless steel
Shell is corrected, and continues to be passed through hydrogen, stainless steel casing is cooled to room temperature.
Wherein, the protective gas is pure nitrogen gas.
Wherein, aqueous 0.35g during the water content of the air of the drying is per litres of air.
After testing, its case hardness improves 49.7% than SUS304 stainless steel materials, and corrosion resistance is preferable, dimensionally stable
Property is good, meets using standard.
Embodiment 3
A kind of processing method of lithium battery stainless steel casing, the lithium battery stainless steel casing have thickness for 0.55mm thickness
SUS304 stainless steel materials punching stretch forms, and its annealing process comprises the following steps：
（1）Protective gas is full of in continuous bright annealing furnace, makes the stainless steel casing of the drawing and forming in temperature be 400
Annealed 40 minutes under conditions of DEG C；
（2）The stainless steel casing of the drawing and forming after above-mentioned processing is put into ion nitriding furnace, is passed through hydrogen, Ran Houqi
Brightness heats up, and after being warming up to 650 DEG C, is passed through nitrogen, and the volume ratio for adjusting nitrogen and hydrogen is 1:3.5, furnace pressure 200Pa,
Handled 1 hour under conditions of being 640 DEG C in temperature；
（3）Step（2）After the completion of close nitrogen, continue to be passed through hydrogen, reduce electric current and magnitude of voltage, be passed through after being cooled to 340 DEG C
Entered the air dried and carry out surface oxidation, after aoxidizing 25 minutes, stopping is passed through air, ion nitriding furnace is closed, to stainless steel
Shell is corrected, and continues to be passed through hydrogen, stainless steel casing is cooled to room temperature.
Wherein, the protective gas is pure hydrogen.
Wherein, aqueous 0.65g during the water content of the air of the drying is per litres of air.
After testing, its case hardness improves 48.3% than SUS304 stainless steel materials, and corrosion resistance is preferable, dimensionally stable
Property is good, meets using standard.
Claims (4)
1. a kind of processing method of lithium battery stainless steel casing, it is 0.35-0.55mm that the lithium battery stainless steel casing, which has thickness,
Thick SUS304 stainless steel materials punching stretch forms, it is characterised in that its annealing process comprises the following steps：
（1）Protective gas is full of in continuous bright annealing furnace, the stainless steel casing for making the drawing and forming is in temperature
Annealed under conditions of 400-450 DEG C 30-40 minutes；
（2）The stainless steel casing of the drawing and forming after above-mentioned processing is put into ion nitriding furnace, is passed through hydrogen, Ran Houqi
Brightness heats up, and after being warming up to 650 DEG C, is passed through nitrogen, and the volume ratio for adjusting nitrogen and hydrogen is 1:2.5-3.5 furnace pressure is
200-400Pa, 1-1.5 hours are handled under conditions of being 620-640 DEG C in temperature；
（3）Step（2）After the completion of close nitrogen, continue to be passed through hydrogen, reduce electric current and magnitude of voltage, after being cooled to 340-360 DEG C
It is passed through into excessively dry air and carries out surface oxidation, after aoxidizing 15-25 minutes, stopping is passed through air, closes ion nitriding furnace, right
Stainless steel casing is corrected, and continues to be passed through hydrogen, stainless steel casing is cooled to room temperature.
2. a kind of processing method of lithium battery stainless steel casing as claimed in claim 1, it is characterised in that the protective gas is
Ammonolysis craft gas, pure nitrogen gas or pure hydrogen.
A kind of 3. processing method of lithium battery stainless steel casing as claimed in claim 2, it is characterised in that the ammonolysis craft gas
The volume ratio of middle nitrogen and hydrogen is 1:3.
A kind of 4. processing method of lithium battery stainless steel casing as claimed in claim 1, it is characterised in that the air of the drying
Water content be per aqueous 0.35-0.65g in litres of air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711217121.1A CN107858488A (en) | 2017-11-28 | 2017-11-28 | A kind of processing method of lithium battery stainless steel casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711217121.1A CN107858488A (en) | 2017-11-28 | 2017-11-28 | A kind of processing method of lithium battery stainless steel casing |
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| Publication Number | Publication Date |
|---|---|
| CN107858488A true CN107858488A (en) | 2018-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711217121.1A Pending CN107858488A (en) | 2017-11-28 | 2017-11-28 | A kind of processing method of lithium battery stainless steel casing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112941278A (en) * | 2021-01-13 | 2021-06-11 | 南京宁欣机械有限公司 | Metal diaphragm stamping process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1588670A (en) * | 2004-09-15 | 2005-03-02 | 广州市淞海五金制品有限公司 | Method for processnig column type stainless steel lithium cell outer case |
| CN101818320A (en) * | 2010-05-12 | 2010-09-01 | 哈尔滨工业大学 | Method for obtaining rigidity continuous distribution modified layer on surface of stainless steel |
| CN103014599A (en) * | 2012-12-09 | 2013-04-03 | 常州大学 | Treatment process of composite surface of austenitic stainless steel |
| CN103789722A (en) * | 2014-01-15 | 2014-05-14 | 常州大学 | Chemical heat treatment method capable of obviously improving corrosion resistance of gear |
| CN105603359A (en) * | 2016-03-28 | 2016-05-25 | 福建上润精密仪器有限公司 | Glow ion carbonization method for enhancing surface hardness and corrosion resistance of stainless steel |
-
2017
- 2017-11-28 CN CN201711217121.1A patent/CN107858488A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1588670A (en) * | 2004-09-15 | 2005-03-02 | 广州市淞海五金制品有限公司 | Method for processnig column type stainless steel lithium cell outer case |
| CN101818320A (en) * | 2010-05-12 | 2010-09-01 | 哈尔滨工业大学 | Method for obtaining rigidity continuous distribution modified layer on surface of stainless steel |
| CN103014599A (en) * | 2012-12-09 | 2013-04-03 | 常州大学 | Treatment process of composite surface of austenitic stainless steel |
| CN103789722A (en) * | 2014-01-15 | 2014-05-14 | 常州大学 | Chemical heat treatment method capable of obviously improving corrosion resistance of gear |
| CN105603359A (en) * | 2016-03-28 | 2016-05-25 | 福建上润精密仪器有限公司 | Glow ion carbonization method for enhancing surface hardness and corrosion resistance of stainless steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112941278A (en) * | 2021-01-13 | 2021-06-11 | 南京宁欣机械有限公司 | Metal diaphragm stamping process |
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Application publication date: 20180330 |