CN106367789B - Battery steel band uses the preparation method of the battery steel shell of the steel band and the steel shell - Google Patents
Battery steel band uses the preparation method of the battery steel shell of the steel band and the steel shell Download PDFInfo
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- CN106367789B CN106367789B CN201610970912.0A CN201610970912A CN106367789B CN 106367789 B CN106367789 B CN 106367789B CN 201610970912 A CN201610970912 A CN 201610970912A CN 106367789 B CN106367789 B CN 106367789B
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
- C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention relates to a kind of battery steel bands, use the preparation method of the battery steel shell of the steel band and the steel shell, steel band of the invention is first respectively formed nickel electroplated layer on surface, and the nickel coating of inner surface is more than or equal to outer surface, then the coating of steel strip surface and matrix are permeated mutually by heat treatment form Fe-Ni alloy/C layer, this Fe-Ni alloy/C layer compact structure formed by heat treatment, antiseptic property is good, binding force between Fe matrix is far longer than the binding force between conventional electroplated layer and Fe matrix, a possibility that generating crack when reducing steel shell punching, and condition can be provided to form the good rear electroplated Ni layer of binding force on surface；Steel shell of the invention is by nickel preplating nickel plating nickel plating twice with after, both had the characteristics that inner surface nickel layer was thick, improve the storage electrical property of battery, there is compactness more much better than simple electroless nickel layer and anti-corrosion capability again, solve the problems, such as that the dissolution of steel shell iron matrix when battery is stored for a long time causes battery leakage.
Description
Technical field
The present invention relates to battery steel band, steel shell technical field, a kind of battery steel band, the battery using the steel band are referred specifically to
The preparation method of steel shell and the steel shell.
Background technique
Battery carries out anticorrosion using the technique in iron-based material plating nickel on surface with steel shell, and nickel plating technology usually divides
For nickel preplating and two kinds of techniques of rear nickel plating.
External battery producer mainly uses nickel preplating.This technique is raw material --- the steel that nickel is first plated in steel shell
Band substrate surface carries out stretching again punching into steel shell after becoming nickel preplating steel band.Nickel preplating has the advantage that
(1) since nickel preplating is the raw material steel strip surface that nickel is first electroplated onto steel shell, this is a kind of plane plating
Technique, therefore not only coating is uniform, and the thickness of steel strip surface electroplated layer will not be restricted, it is ensured that steel band is appointed
Available uniform and adequate thickness nickel coating on one side, there is no critical steel shell inner surface coating in rear electroplating technology
The problem of thickness deficiency.
(2) steel band can also will make coating and matrix intersection alloying by heat treatment after plating, not only increase
The binding force of coating and matrix also keeps coating finer and close, further increases the anti-corrosion capability of coating.
There is also some shortcomings for nickel preplating:
(1) material cost is high.Steel band can generate 30% or more leftover pieces, and preplating nickel steel when stretching punching into steel shell
Nickel in band is uniformly to be plated on steel band, therefore these wastes for being plated in nickel on leftover pieces make the increased costs of steel shell, cause
The production cost of nickel preplating is higher than rear nickel plating technology；
(2) using this technique, the battery in long-term storage easily causes leakage to alkaline battery.Nickel preplating steel band is in steel shell
The nickel layer on surface is also by constantly stretcher strain during stretching punching, and coating can generate crack, and original crack etc. is bad
Point can constantly be stretched, expand, and form the crack of a large amount of straight-through Fe matrixes, battery is in long term storage below these cracks
Fe matrix on iron composition can gradually dissolve out and cause battery leakage, influence the storage life of battery；
(3) steel shell is easy to cause the life of battery outer surface in the crack for stretching these the straight-through matrixes generated during punching
Rust.
To solve the above-mentioned problems, domestic some manufacturers develop a kind of technology for being flash, are exactly in nickel preplating
After steel band is washed into steel shell, then generated to fill this nickel coating during stretching in one layer of very thin nickel of steel shell surface flash
Crack, the thin nickel coating of this flash be especially in a short time battery carry out high temperature and when high temperature and humidity test have it is brighter
Aobvious improvement, but this flash nickel layer on the one hand due to coating is too thin and action time is not long, on the other hand this sudden strain of a muscle
Nickel coating is not often well bonded with matrix nickel layer, the even meeting of flash layer due to being the plating carried out on nickel coating
It forms turtle shell shape on Ni substrate surface to take off, battery is actual to store that the effect is unsatisfactory for a long time.
What domestic battery was generallyd use with steel shell especially alkaline battery with steel shell is rear nickel plating technology, and being exactly first will be former
Base steel band stretches punching and carries out deep hole nickel plating at steel shell, then to steel shell.Nickel plating technology mainly has relative to nickel preplating afterwards
Feature at low cost, coating surface compactness is good, but there is also some problems for opposite nickel preplating:
(1) it is limited by the covering power of Deep hole electroplating technique, using the rear nickel plating technology of deep hole nickel plating technology in plating
Since steel shell inner surface is used and influenced by the shielding of steel shell oral area power line, the deposition velocity of coating is far below outside, in steel shell
The thickness of surface nickel coating is restricted, and is unable to reach the thickness that normal technique requires, is affected the storage electrical property of battery.
The nickel coating for the steel shell inside bottom being electroplated afterwards is typically only capable to reach 0.25 or so, is difficult to be further added by, because even by various
Method increases thickness (for example Zeng You producer is plated to 0.35 micron), and the porosity of coating will increase considerably, the storage of battery
Service life shortens rapidly instead or even the time of one or two years occurs as soon as leakage.Due to the inner surface of the steel shell of rear electroplating technology production
Nickel coating than relatively thin, battery storage certain time (for example more than half a year) electrical property fall than nickel preplating
Battery is big by 5% or so；
(2) it is limited by Deep hole electroplating technique, the coating deposition rate of steel shell outer surface is significantly larger than the coating of inner surface
Deposition velocity will synchronize the thickness of increase outer surface coating to increase the thickness of coating of inner surface as much as possible, and cause steel
The thickness of coating of shell outer surface much higher than thickness required for anti-corrosion normal outside steel shell, cause the waste of the nickel metal of high price with
The raising of electroplating cost.For example, for LR6 steel shell, when inner surface bottom, thickness of coating reaches 0.25 micron, steel shell head
The thickness of portion outer surface coating averagely reaches 3.5 microns or more, and thickness has been even more than 5 microns, and outer surface nickel coating
Effect is mainly antirust, and usual 2 microns are sufficient, this results in the waste of outer surface nickel dosage, improves electroplating cost；
(3) although the nickel coating of rear electroplating technology no longer needs stretch process, splits without generation coating in drawing process
The problem of gap, theoretically for electroplated layer compactness it is relatively preferable, but since Deep hole electroplating needs to be added a large amount of plating additions
The reasons such as influence of the product that additive constantly decomposes in agent and electroplating process to coating, electroplating technology and production process pipe
The problems such as reason, can seriously affect quality of coating, once technological design is unreasonable or plating the control of tank liquor goes wrong or fluctuate,
The problems such as be easy to causeing the substantial increase of plating layer porosity, it is raw to be higher than nickel preplating instead for its porosity profiles when serious
The storage life of the steel shell of production, battery is even lower than nickel preplating instead；
(4) afterwards in the coating of electroplating technology there is a certain amount of sulphur, it is the production solution that electroplating additive decomposes, in coating
The presence of sulphur will affect the corrosion resistance of coating, and coating surface will gradually turn to be yellow oxidation within the time of some months, simultaneously
When influencing surface conductance, battery being caused to use the problems such as false not enough power supply；
(5) electroplating technology in the incision of steel shell is easy to produce a large amount of nickel flower afterwards, these nickel flower holds in battery production
Easy-peel completion nickel powder is easily mixed into battery and causes battery leakage.
There are one the problems of reality for electroplating technology afterwards: with the reinforcement of government's environmental protection dynamics, distributed steel shell plating
Producer increasingly experiences the pressure in terms of environmental protection, and the cost of plating is mainly that environmentally friendly cost is higher and higher, improves the life of plating
It produces efficiency and means that the cost for reducing plating.
It integrates, for technical standpoint, nickel preplating is in terms of battery provides battery storage electrical property
Advantage, because influence of the steel shell to battery storage electrical property is related with the thickness of the nickel coating of inner surface, and it is unrelated with compactness；
And the storage life of battery is then not only related with the thickness of nickel nickel layer, it is more related with the compactness of nickel coating.Though electroplating technology afterwards
So there is deficiency in the inner surface nickel layer thickness of steel shell, but since its compactness is preferable, in terms of the storage life of battery
It is better than nickel preplating instead.
Therefore, for battery especially alkaline battery, to reach storage electrical property simultaneously and be taken into account with storage life, just
The steel shell manufacturing process for needing a kind of thickness in steel shell inner surface nickel coating and compactness both to be taken into account, and if
There can be again further improvement in other aspects such as production costs, then for battery technology especially alkaline battery technology
It will be with unusual meaning.
Summary of the invention
The technical problem to be solved by the invention for the present situation of prior art is to provide one kind not only to effectively improve plating
Layer combination fastness and compactness, with more the battery steel band that can carry out electronickelling again after steel shell is made.
Another technical problem to be solved by this invention is the status for the prior art, provides a kind of use above-mentioned electricity
The battery steel shell of pond steel band, the battery steel shell have preferable anticorrosion and antirust function, and inner wall has enough nickel layers thick again
Degree makes battery have preferable storage electrical property.
Another technical problem to be solved by this invention is the status for the prior art, provides a kind of above-mentioned battery steel
The preparation method of shell, the thickness of serving in this method energy active balance steel shell improve production efficiency, reduce production cost；Together
The compactness of Shi Tigao coating and its binding force between steel shell matrix, enhance the antiseptic property of steel shell, avoid battery leakage
The generation of problem extends the storage life of battery.
The technical scheme of the invention to solve the technical problem is: a kind of battery steel band, including Fe matrix, it is special
Sign is: being respectively formed with Fe-Ni alloy/C layer on two faces of the Fe matrix, wherein the Fe-Ni alloy/C of Fe base inner surface
Layer is with a thickness of 0.2 μm or more, and the Fe-Ni alloy/C layer of Fe outer surface of matrix is with a thickness of 0.05 μm or more, and table in the Fe matrix
The Fe-Ni alloy/C thickness degree in face is greater than the Fe-Ni alloy/C thickness degree of Fe outer surface of matrix side.
In the above scheme, the Fe-Ni alloy/C layer is by Ni layers of thermally treated alloy of plating of Fe matrix and its surface
Change and obtains；With a thickness of 0.2~1.2 μm, the Fe-Ni of Fe outer surface of matrix is closed the Fe-Ni alloy/C layer of the Fe base inner surface
Layer gold is with a thickness of 0.05~1.0 μm.The Fe-Ni alloy/C layer of the Fe base inner surface is by Ni layers of plating with a thickness of 0.2~0.6 μm
It interpenetrates to be formed with Fe matrix, the Fe-Ni alloy/C layer of the Fe outer surface of matrix is by Ni layers of plating with a thickness of 0.05~0.5 μm
It interpenetrates to be formed with Fe matrix, wherein being formed by Fe-Ni alloy/C thickness degree can be because of the mode of heat treatment, temperature, time
It is different and have differences, as long as guaranteeing that the Fe atom in Fe matrix penetrates into always Ni coating surface.First in Fe matrix table
Ni is plated in face, is then made Ni layers of the plating to interpenetrate to form alloying with Fe matrix by heat treatment, is formed Fe-Ni alloy/C layer, with
The Ni electroplated layer directly formed by plating mode in nickel-plating technology after existing is different, and the present invention is formed by heat treatment
Fe-Ni alloy/C layer and the binding force of Fe matrix are stronger, and Fe-Ni alloy/C layer structure is also more fine and close；With existing through Overheating Treatment
Nickel preplating steel band it is different, the Fe-Ni alloy/C layer one side coating that the present invention is formed is thinner, the generation when stretching punching into steel shell
A possibility that crack, is smaller, and another aspect nickel coating has integrally carried out alloying, after can carrying out again after punching is at steel shell
Nickel plating is bad without will lead to coating.
Preferably, the Fe-Ni alloy/C layer of the Fe base inner surface is with a thickness of 0.4~1.0 μm, the Fe matrix appearance
The Fe-Ni alloy/C layer in face is with a thickness of 0.05~0.2 μm.
A kind of battery steel shell using above-mentioned battery steel band, it is characterised in that: the battery steel shell is by the battery steel band
It stretches punching to be formed, the inner surface of the steel band is located at the inside of battery steel shell, and the outer surface of the steel band is located at battery steel shell
Outside, and there are be coated on Fe-Ni alloy/C layer outer surface latter plating Ni layers on the medial surface of the battery steel shell, the electricity
Latter plating Ni layers of pond steel shell bottom with a thickness of 0.05~0.3 μm, have on the lateral surface of the battery steel shell and be coated on Fe-Ni
Latter plating Ni layers on alloy-layer outer surface, this it is rear plating Ni layers with a thickness of 1.0~3.5 μm.
Preferably, after the battery steel shell inside bottom plate Ni layers with a thickness of 0.06~0.20 μm, the battery steel
Latter plating Ni layers of shell outboard head portion with a thickness of 1.8~2.5 μm.Pure nickel is converted to since steel shell inside pre-galvanized has formd
For 0.3~0.4 μm of Fe-Ni alloy/C layer, 0.06~0.20 μm of nickel coating of formation, steel shell inner surface are electroplated after adding
The total nickel layer that will have 0.36~0.60 μ m-thick in bottom, has been more than the nickel layer thickness of rear electroplating technology, therefore be electroplated after battery ratio
With better storage electrical property；The Fe-Ni alloy/C layer of matrix surface preplating is not only comparatively dense, is firmly combined with Fe matrix,
And since thickness is significantly lower than normal rear electroless nickel layer, a possibility that coating generates crack in drawing process is reduced, then
One layer of finer and close rear electroplated layer is added on surface, good protection is formd to steel shell surface, makes iron dissolution on matrix
Possibility is greatly lowered, thus greatly reduce battery in long-term storage a possibility that leakage, significantly extend battery
Period of storage and validity period.The thickness of nickel coating is electroplated after entire although lower than normal rear electroplating technology on the outside of steel shell
Thickness of coating be require design according to meeting outside surface anticorrosion erosion, therefore can satisfy basic outer surface antirust requirement, then plus
The Ni-Fe alloy-layer of upper 0.05~0.20 μ m-thick of matrix surface can satisfy the requirement of normal table antirust completely, last in this way
Obtained battery steel shell reduces 19% or so in terms of entirety nickel amount compared with the battery steel shell prepared in the prior art,
And electroplating time is shortened while reducing high price nickel dosage, so that the production efficiency being electroplated after current steel shell is improved 30%
Left and right.
A kind of preparation method of above-mentioned battery steel shell, it is characterised in that the following steps are included:
(1) steel band pre-galvanized
Nickel preplating is carried out to steel strip substrate, Ni layers of plating with a thickness of 0.2~0.6 μm are formed in the inner surface of steel band, in steel
The outer surface of band forms Ni layers of plating with a thickness of 0.05~0.5 μm, and the nickel plating layer thick of inner surface is greater than the plating of outer surface
Nickel layer thickness；
(2) steel band is heat-treated
There is the steel band of nickel coating to be heat-treated at 350 DEG C or more two sides obtained by step (1), makes the plating on steel band two sides
Ni layers interpenetrate to form Fe-Ni alloy/C layer with the Fe matrix of border respectively；The time of heat treatment can be detected with nickel plating layer surface
Ferro element is limited；
Wherein, be subject to Ni content >=20% in Fe-Ni alloy/C layer, steel band inner surface Fe-Ni alloy/C layer with a thickness of 0.2
~0.9 μm, steel band outer surface Fe-Ni alloy/C layer with a thickness of 0.05~0.7 μm；It should be noted that making in high-temperature heat treatment
Under, the Fe atom in Ni and Fe matrix in Ni layers of plating interpenetrates to form Fe-Ni alloy/C layer, Fe-Ni alloy/C layer and Fe base
Between body without specific interface layer, and Fe-Ni alloy/C layer is formed from former nickel coating is with Fe matrix intersection to two sides
Certain concentration gradient, and it is more close to Fe intrinsic silicon, the content of Ni is lower, and therefore, the present invention in Fe-Ni alloy/C layer to examine
It measures subject to Ni content >=20% and calculates the thickness of Fe-Ni alloy/C layer；
(3) steel shell drawing and forming
There is the steel band of Fe-Ni alloy/C layer to stretch punching into battery steel shell, the inner surface of steel band two sides obtained by step (2)
On the inside of steel shell, the outer surface of steel band is located on the outside of steel shell；
(4) it is electroplated after steel shell
Nickel plating after carrying out to battery steel shell obtained by step (3), the Fe-Ni alloy/C layer surface on the inside of steel shell form steel shell bottom
Portion is formed with a thickness of 0.05~0.3 μm of rear electroplated Ni layer on the Fe-Ni alloy/C layer on the outside of steel shell with a thickness of 1.0~3.5 μm
Latter plating Ni layers.
In the above scheme, inner surface is different from the roughness of outer surface after the plating of steel band described in step (1) Ni, and interior table
The roughness in face is lower than the roughness of outer surface, is not both to easily identify in steel shell produces using surfaces externally and internally roughness
The surfaces externally and internally of steel band, prevents surfaces externally and internally from getting wrong.
As an improvement, heat treatment temperature is 370~750 DEG C in step (2), the plating of the steel shell inner surface side after heat treatment
Nickel layer surface forms Fe-Ni alloy/C layer of the iron-content 20% or more.Steel band carry out heat treatment on the one hand can make plating Ni layer and
Fe matrix, which combines, forms fine and close Fe-Ni alloy/C layer, on the other hand, the thioneine in coating can be made to evaporate and significantly reduce, into
One step improves antiseptic property.
Preferably, in step (2) after heat treatment the Fe-Ni alloy/C layer of gained steel band inner surface with a thickness of 0.4~1.0 μm,
The Fe-Ni alloy/C layer of outer surface is with a thickness of 0.05~0.2 μm.
Compared with the prior art, the advantages of the present invention are as follows:
Steel band of the invention first forms thicker and uniform pre-nickel plating in inner surface, to solve rear electroplating technology steel
The problem that shell inner surface nickel coating is relatively thin, battery storage performance is bad；One side in outer surface forms relatively thin pre-nickel plating, and one
The thickness of inner surface nickel layer, another party can be increased when aspect is electroplated after being used in the case where outer surface plating same thickness nickel layer
Face also reduces the waste of nickel on leftover pieces after nickel preplating steel shell punching, and the certain thickness pre-nickel plating in surface can be to steel
Belt surface forms protection, is unlikely to get rusty before punching is at steel shell；Make the nickel-plate alloy on steel band two sides by being heat-treated
Change, Fe-Ni alloy/C layer is respectively formed in surfaces externally and internally by diffusing into one another between nickel coating and iron matrix, the Fe- after alloying
Ni alloy-layer is finer and close than nickel coating, and the binding force between Fe matrix is much better than simple electroplated layer, adds preplating
The thickness of nickel layer is significantly lower than common process pre-nickel plating, and the ductility of galvanneal coating is made to be far superior to conventional pre-nickel plating,
Make during steel shell punching coating lead to the problem of crack to be greatly improved, it is often more important that, the alloying of pre-plating layer solves pre-
The binding force problem of two plating interlayers when nickel plated steel shell is electroplated after carrying out again.
Steel shell of the invention first stretches punch forming by the steel band that surface is formed with Fe-Ni alloy/C layer, then carries out depth again
Hole nickel plating (rear plating), on the inside of the steel shell after relatively thin nickel coating is electroplated, thicker nickel coating is electroplated on the outside of steel shell.Due to
Fe-Ni alloy/C layer itself has quite high compactness, and the Fe-Ni alloy/C layer and the Fe matrix and nickel coating on its surface have
There is a very high binding force, therefore steel shell of the invention has compactness more much better than simple electroless nickel layer, adds Fe-Ni
The Corrosion Resistant Mechanism for the different components MULTI-LAYER NICKEL that alloy-layer and electroless nickel layer are formed, significantly improves steel shell surface anticorrosion ability.
In steel shell preparation method of the invention, in punching steel shell, due to the Fe-Ni alloy/C layer on steel band not only with matrix
With extraordinary binding force, and its thickness is also thinner than conventional nickel preplating steel band more, considerably reduces steel shell punching
Coating generates a possibility that crack in drawing process, so that the compactness of steel shell punching rear surface is substantially improved, in conjunction with rear electricity
The further protection of nickel coating forms coating more much better than simple nickel preplating or rear nickel plating compactness on steel shell surface and protects
Shield, not only the storage electrical property of battery is obviously improved, and is also obtained in terms of the iron dissolution of steel shell inner surface and significantly changed
It is kind, to effectively avoid the generation of battery leakage problem, extend the storage life of battery.
In the preparation process of steel shell, since steel band inner surface has been pre-formed the Fe-Ni alloy/C layer of suitable thickness,
In rear plating, thickness of coating can be controlled by the thickness on the outside of steel shell, avoid to guarantee steel shell inner surface coating in this way
Thickness and make outer surface thickness of coating substantially exceed the thickness of needs, increase nickel consumption the problem of so that steel shell production in it is comprehensive
The nickel amount for closing consumption is not only significantly lower than nickel preplating, is also significantly lower than rear electroplating technology, drastically reduces nickel
It consumes, reduce production cost, simultaneously as nickel plating thickness is greatly reduced when rear nickel plating, largely shorten electricity
Plating time, the environmentally friendly cost for improving plating production efficiency, reducing plating.
Detailed description of the invention
Fig. 1 is the partial structure diagram of battery steel band in the embodiment of the present invention 1；
Fig. 2 is the partial structure diagram in Fig. 1 in steel band preparation process；
Fig. 3 is the partial structure diagram of battery steel shell in the embodiment of the present invention 1.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
Embodiment 1:
As shown in Figure 1, the battery steel band a of the present embodiment includes Fe matrix 1 and Fe-Ni alloy/C layer, two faces of Fe matrix 1
On be respectively formed with Fe-Ni alloy/C layer 2 ', 2 ", wherein the Fe-Ni alloy/C layer 2 ' of 1 inner surface of Fe matrix is with a thickness of 0.4 μm, Fe
The Fe-Ni alloy/C layer 2 " of 1 outer surface of matrix is with a thickness of 0.1 μm.Above-mentioned Fe-Ni alloy/C layer is by the plating of Fe matrix 1 and its surface
Ni layers of thermally treated alloying and obtain, i.e., as shown in Fig. 2, first 1 two surfaces of Fe matrix plate respectively Ni formed plating Ni layer 3 ',
3 ", plating Ni layer 3 ', 3 " then made by heat treatment and Fe matrix 1 interpenetrate Fe-Ni alloy/C layer 2 ' that alloying formed,
2".It is different from the conventional direct Fe-Ni electroplated layer formed by plating mode, the Fe-Ni that the present invention is formed by heat treatment
The binding force of alloy-layer and Fe matrix 1 is stronger, and Fe-Ni alloy/C layer structure is also more fine and close.
It is rushed as shown in figure 3, being stretched using the battery steel shell b of above-mentioned battery steel band by above-mentioned battery steel band a in the present embodiment
System is formed, and the inner surface of steel band a is located at the inside of battery steel shell b, and the outer surface of steel band a is located at the outside of battery steel shell b, and electricity
Pond steel shell b is electroplated after carrying out again, and the rear plating Ni layer 21 being coated on 2 ' outer surface of Fe-Ni alloy/C layer, electricity are formed on medial surface
Behind the bottom steel shell b of pond plate Ni layer 21 with a thickness of 0.3 μm, on the lateral surface of battery steel shell b formation be coated on Fe-Ni alloy/C layer
Rear plating Ni layer 22 on 2 " outer surfaces, this it is rear plating Ni layer 22 with a thickness of 3.5 μm.
The preparation method of above-mentioned battery steel shell the following steps are included:
(1) steel band pre-galvanized
Nickel preplating is carried out to steel band a, as shown in Fig. 2, the inner surface in steel band Fe matrix 1 forms the plating with a thickness of 0.2 μm
Ni layer 3 ' forms the plating Ni layer 3 " with a thickness of 0.05 μm in the outer surface of steel band；The surface roughness for plating Ni layer 3 ' is less than plating
The surface roughness of Ni layer 3 "；
(2) steel band is heat-treated
There is the steel band of nickel coating to be heat-treated at 370 DEG C two sides obtained by step (1), as shown in Figure 1, 2, makes steel band
The plating Ni layer 3 ', 3 " on two sides interpenetrates to form alloy-layer with adjacent Fe matrix 1 respectively, i.e. Fe-Ni alloy/C layer 2 ', 2 ",
In, be subject to Ni content >=20% in Fe-Ni alloy/C layer, steel band inner surface Fe-Ni alloy/C layer with a thickness of 0.4 μm, outside steel band
Surface Fe-Ni alloy/C layer with a thickness of 0.1 μm；
(3) steel shell drawing and forming
There is the stretching flushing technology of the nickel preplating steel band of Fe-Ni alloy/C layer routinely to stretch two sides obtained by step (2)
At battery steel shell, the inner surface of steel band is located on the inside of steel shell for punching, and the outer surface of steel band is located on the outside of steel shell；
(4) it is electroplated after steel shell
Nickel plating after being carried out to battery steel shell obtained by step (3) the, as shown in figure 3,2 ' table of Fe-Ni alloy/C layer on the inside of steel shell
Face is formed in the rear plating Ni layer 21 that steel shell bottom thickness is 0.3 μm, and the 2 " surface of Fe-Ni alloy/C layer on the outside of steel shell forms thickness
For 3.5 μm of rear plating Ni layer 22.
Embodiment 2:
As shown in Figure 1, the battery steel band a of the present embodiment includes Fe matrix 1 and Fe-Ni alloy/C layer 2 ', 2 ", Fe matrix 1
Fe-Ni alloy/C layer 2 ', 2 " is respectively formed on two faces, wherein the Fe-Ni alloy/C layer 2 ' of 1 inner surface of Fe matrix is with a thickness of 0.5
μm, the Fe-Ni alloy/C layer 2 " of 1 outer surface of Fe matrix is with a thickness of 0.25 μm.Above-mentioned Fe-Ni alloy/C layer 2 ', 2 " be by Fe matrix 1 with
The thermally treated alloying of plating Ni layer 3 ', 3 " on its surface and obtain, i.e., as shown in Fig. 2, first 1 surface of Fe matrix plating Ni formed plating
Ni layer 3 ', 3 ", the Fe-Ni alloy/C layer 2 ', 2 " for then forming plating Ni layer 3 ', 3 " and 1 alloying of Fe matrix by heat treatment.
It is different from the Fe-Ni electroplated layer directly formed in the prior art by plating mode, the Fe-Ni that the present invention is formed by heat treatment
The binding force of alloy-layer 2 ', 2 " and Fe matrix 1 is stronger, and 2 ', 2 " structure of Fe-Ni alloy/C layer is also more fine and close.
It is rushed as shown in figure 3, being stretched using the battery steel shell b of above-mentioned battery steel band by above-mentioned battery steel band a in the present embodiment
System is formed, and the inner surface of steel band a is located at the inside of battery steel shell b, and the outer surface of steel band a is located at the outside of battery steel shell b, and electricity
Pond steel shell b is electroplated after carrying out again, and the rear plating Ni layer 21 being coated on 2 ' outer surface of Fe-Ni alloy/C layer, electricity are formed on medial surface
Behind the bottom steel shell b of pond plate Ni layer 21 with a thickness of 0.25 μm, on the lateral surface of battery steel shell b formation be coated on Fe-Ni alloy/C
Layer 2 " outer surface on rear plating Ni layer 22, this it is rear plate Ni layer 22 with a thickness of 2.5 μm.
The preparation method of above-mentioned battery steel shell the following steps are included:
(1) steel band pre-galvanized
Nickel preplating is carried out to steel band a, as shown in Fig. 2, the inner surface in steel band Fe matrix 1 forms the plating with a thickness of 0.3 μm
Ni layer 3 ' forms the plating Ni layer 3 " with a thickness of 0.15 μm in the outer surface of steel band；The surface roughness for plating Ni layer 3 ' is less than plating
The surface roughness of Ni layer 3 "；
(2) steel band is heat-treated
There is the steel band of nickel coating to be heat-treated at 750 DEG C two sides obtained by step (1), as shown in Figure 1, 2, makes steel band
The plating Ni layer 3 ', 3 " on two sides interpenetrates to form alloy-layer with adjacent Fe matrix 1 respectively, i.e. Fe-Ni alloy/C layer 2 ', 2 ",
In, be subject to Ni content >=20% in Fe-Ni alloy/C layer, steel band inner surface Fe-Ni alloy/C layer with a thickness of 0.5 μm, outside steel band
Surface Fe-Ni alloy/C layer with a thickness of 0.25 μm；
(3) steel shell drawing and forming
There is the steel band of Fe-Ni alloy/C layer to stretch punching into battery steel shell, the inner surface of steel band two sides obtained by step (2)
On the inside of steel shell, the outer surface of steel band is located on the outside of steel shell；
(4) it is electroplated after steel shell
Nickel plating after being carried out to battery steel shell obtained by step (3) the, as shown in figure 3,2 ' table of Fe-Ni alloy/C layer on the inside of steel shell
Face forms the rear plating Ni layer 21 that steel shell bottom thickness is 0.25 μm, and the 2 " surface of Fe-Ni alloy/C layer on the outside of steel shell forms thickness
For 2.5 μm of rear plating Ni layer 22.
Embodiment 3:
As shown in Figure 1, the battery steel band a of the present embodiment includes Fe matrix 1 and Fe-Ni alloy/C layer 2 ', 2 ", Fe matrix 1
Fe-Ni alloy/C layer 2 ', 2 " is respectively formed on two faces, wherein the Fe-Ni alloy/C layer 2 ' of 1 inner surface of Fe matrix is with a thickness of 0.7
μm, the Fe-Ni alloy/C layer 2 " of 1 outer surface of Fe matrix is with a thickness of 0.2 μm.Above-mentioned Fe-Ni alloy/C layer 2 ', 2 " be by Fe matrix 1 with
The thermally treated alloying of plating Ni layer 3 ', 3 " on its surface and obtain, i.e., as shown in Fig. 2, first 1 surface of Fe matrix plating Ni formed plating
Ni layer 3 ', 3 ", the Fe-Ni alloy/C layer 2 ', 2 " for then forming plating Ni layer 3 ', 3 " and 1 alloying of Fe matrix by heat treatment.
It is different from the Fe-Ni electroplated layer directly formed in the prior art by plating mode, the Fe-Ni that the present invention is formed by heat treatment
The binding force of alloy-layer 2 ', 2 " and Fe matrix 1 is stronger, and Fe-Ni alloy/C layer structure is also more fine and close.
It is rushed as shown in figure 3, being stretched using the battery steel shell b of above-mentioned battery steel band by above-mentioned battery steel band a in the present embodiment
System is formed, and the inner surface of steel band a is located at the inside of battery steel shell b, and the outer surface of steel band a is located at the outside of battery steel shell b, and electricity
Pond steel shell b is electroplated after carrying out again, and the rear plating Ni layer 21 being coated on 2 ' outer surface of Fe-Ni alloy/C layer, electricity are formed on medial surface
Behind the bottom steel shell b of pond plate Ni layer 21 with a thickness of 0.18 μm, on the lateral surface of battery steel shell b formation be coated on Fe-Ni alloy/C
Layer 2 " outer surface on rear plating Ni layer 22, this it is rear plate Ni layer 22 with a thickness of 2.0 μm.
The preparation method of above-mentioned battery steel shell the following steps are included:
(1) steel band pre-galvanized
Nickel preplating is carried out to steel band a, as shown in Fig. 2, the inner surface in steel band Fe matrix 1 forms the plating with a thickness of 0.4 μm
Ni layer 3 ' forms the plating Ni layer 3 " with a thickness of 0.1 μm in the outer surface of steel band；The surface roughness for plating Ni layer 3 ' is less than plating Ni
The surface roughness of layer 3 "；
(2) steel band is heat-treated
There is the steel band of nickel coating to be heat-treated at 600 DEG C two sides obtained by step (1), as shown in Figure 1, 2, makes steel band
The plating Ni layer 3 ', 3 " on two sides interpenetrates to form alloy-layer with adjacent Fe matrix 1 respectively, i.e. Fe-Ni alloy/C layer 2 ', 2 ",
In, be subject to Ni content >=20% in Fe-Ni alloy/C layer, steel band inner surface Fe-Ni alloy/C layer with a thickness of 0.7 μm, outside steel band
Surface Fe-Ni alloy/C layer with a thickness of 0.2 μm；
(3) steel shell drawing and forming
There is the steel band of Fe-Ni alloy/C layer to stretch punching into battery steel shell, the inner surface of steel band two sides obtained by step (2)
On the inside of steel shell, the outer surface of steel band is located on the outside of steel shell；
(4) it is electroplated after steel shell
Nickel plating after being carried out to battery steel shell obtained by step (3) the, as shown in figure 3,2 ' table of Fe-Ni alloy/C layer on the inside of steel shell
Face forms the rear plating Ni layer 21 that steel shell bottom thickness is 0.18 μm, and the 2 " surface of Fe-Ni alloy/C layer on the outside of steel shell forms thickness
For 2.0 μm of rear plating Ni layer 22.
Embodiment 4:
As shown in Figure 1, the battery steel band a of the present embodiment includes Fe matrix 1 and Fe-Ni alloy/C layer 2 ', 2 ", Fe matrix 1
Fe-Ni alloy/C layer 2 ', 2 " is respectively formed on two faces, wherein the Fe-Ni alloy/C layer 2 ' of 1 inner surface of Fe matrix is with a thickness of 0.7
μm, the Fe-Ni alloy/C layer 2 " of 1 outer surface of Fe matrix is with a thickness of 0.4 μm.Above-mentioned Fe-Ni alloy/C layer 2 ', 2 " be by Fe matrix 1 with
The thermally treated alloying of plating Ni layer 3 ', 3 " on its surface and obtain, i.e., as shown in Fig. 2, first 1 surface of Fe matrix plating Ni formed plating
Ni layer 3 ', 3 ", the Fe-Ni alloy/C layer 2 ', 2 " for then forming plating Ni layer 3 ', 3 " and 1 alloying of Fe matrix by heat treatment.
It is different from the Fe-Ni electroplated layer directly formed in the prior art by plating mode, the Fe-Ni that the present invention is formed by heat treatment
The binding force of alloy-layer 2 ', 2 " and Fe matrix 1 is stronger, and 2 ', 2 " structure of Fe-Ni alloy/C layer is also more fine and close.
It is rushed as shown in figure 3, being stretched using the battery steel shell b of above-mentioned battery steel band by above-mentioned battery steel band a in the present embodiment
System is formed, and the inner surface of steel band a is located at the inside of battery steel shell b, and the outer surface of steel band a is located at the outside of battery steel shell b, and electricity
Pond steel shell b is electroplated after carrying out again, and the rear plating Ni layer 21 being coated on 2 ' outer surface of Fe-Ni alloy/C layer, electricity are formed on medial surface
Behind the bottom steel shell b of pond plate Ni layer 21 with a thickness of 0.15 μm, on the lateral surface of battery steel shell b formation be coated on Fe-Ni alloy/C
Layer 2 " outer surface on rear plating Ni layer 22, this it is rear plate Ni layer 22 with a thickness of 1.8 μm.
The preparation method of above-mentioned battery steel shell the following steps are included:
(1) steel band pre-galvanized
Nickel preplating is carried out to steel band a, as shown in Fig. 2, the inner surface in steel band Fe matrix 1 forms the plating with a thickness of 0.5 μm
Ni layer 3 ' forms the plating Ni layer 3 " with a thickness of 0.25 μm in the outer surface of steel band；The surface roughness for plating Ni layer 3 ' is less than plating
The surface roughness of Ni layer 3 "；
(2) steel band is heat-treated
There is the steel band of nickel coating to be heat-treated at 500 DEG C two sides obtained by step (1), as shown in Figure 1, 2, makes steel band
The plating Ni layer 3 ', 3 " on two sides interpenetrates to form alloy-layer with adjacent Fe matrix 1 respectively, i.e. Fe-Ni alloy/C layer 2 ', 2 ",
In, be subject to Ni content >=20% in Fe-Ni alloy/C layer, steel band inner surface Fe-Ni alloy/C layer with a thickness of 0.7 μm, outside steel band
Surface Fe-Ni alloy/C layer with a thickness of 0.4 μm；
(3) steel shell drawing and forming
There is the steel band of Fe-Ni alloy/C layer to stretch punching into battery steel shell, the inner surface of steel band two sides obtained by step (2)
On the inside of steel shell, the outer surface of steel band is located on the outside of steel shell；
(4) it is electroplated after steel shell
Nickel plating after being carried out to battery steel shell obtained by step (3) the, as shown in figure 3,2 ' table of Fe-Ni alloy/C layer on the inside of steel shell
Face forms the rear plating Ni layer 21 that steel shell bottom thickness is 0.15 μm, and the 2 " surface of Fe-Ni alloy/C layer on the outside of steel shell forms thickness
For 1.8 μm of rear plating Ni layer 22.
Embodiment 5:
As shown in Figure 1, the battery steel band a of the present embodiment includes Fe matrix 1 and Fe-Ni alloy/C layer 2 ', 2 ", Fe matrix 1
Fe-Ni alloy/C layer 2 ', 2 " is respectively formed on two faces, wherein the Fe-Ni alloy/C layer 2 ' of 1 inner surface of Fe matrix is with a thickness of 0.9
μm, the Fe-Ni alloy/C layer 2 " of 1 outer surface of Fe matrix is with a thickness of 0.7 μm.Above-mentioned Fe-Ni alloy/C layer 2 ', 2 " be by Fe matrix 1 with
The thermally treated alloying of plating Ni layer 3 ', 3 " on its surface and obtain, i.e., as shown in Fig. 2, first 1 surface of Fe matrix plating Ni formed plating
Ni layer 3 ', 3 ", the Fe-Ni alloy/C layer 2 ', 2 " for then forming plating Ni layer 3 ', 3 " and 1 alloying of Fe matrix by heat treatment.
It is different from the Fe-Ni electroplated layer directly formed in the prior art by plating mode, the Fe-Ni that the present invention is formed by heat treatment
The binding force of alloy-layer 2 ', 2 " and Fe matrix 1 is stronger, and 2 ', 2 " structure of Fe-Ni alloy/C layer is also more fine and close.
It is rushed as shown in figure 3, being stretched using the battery steel shell b of above-mentioned battery steel band by above-mentioned battery steel band a in the present embodiment
System is formed, and the inner surface of steel band a is located at the inside of battery steel shell b, and the outer surface of steel band a is located at the outside of battery steel shell b, and electricity
Pond steel shell b is electroplated after carrying out again, and the rear plating Ni layer 21 being coated on 2 ' outer surface of Fe-Ni alloy/C layer, electricity are formed on medial surface
Behind the bottom steel shell b of pond plate Ni layer 21 with a thickness of 0.05 μm, on the lateral surface of battery steel shell b formation be coated on Fe-Ni alloy/C
Layer 2 " outer surface on rear plating Ni layer 22, this it is rear plate Ni layer 22 with a thickness of 1 μm.
The preparation method of above-mentioned battery steel shell the following steps are included:
(1) steel band pre-galvanized
Nickel preplating is carried out to steel band a, as shown in Fig. 2, the inner surface in steel band Fe matrix 1 forms the plating with a thickness of 0.6 μm
Ni layer 3 ' forms the plating Ni layer 3 " with a thickness of 0.5 μm in the outer surface of steel band；The surface roughness for plating Ni layer 3 ' is less than plating Ni
The surface roughness of layer 3 "；
(2) steel band is heat-treated
There is the steel band of nickel coating to be heat-treated at 600 DEG C two sides obtained by step (1), as shown in Figure 1, 2, makes steel band
The plating Ni layer 3 ', 3 " on two sides interpenetrates to form alloy-layer with adjacent Fe matrix 1 respectively, i.e. Fe-Ni alloy/C layer 2 ', 2 ",
In, be subject to Ni content >=20% in Fe-Ni alloy/C layer, steel band inner surface Fe-Ni alloy/C layer with a thickness of 0.9 μm, outside steel band
Surface Fe-Ni alloy/C layer with a thickness of 0.7 μm；
(3) steel shell drawing and forming
There is the steel band of Fe-Ni alloy/C layer to stretch punching into battery steel shell, the inner surface of steel band two sides obtained by step (2)
On the inside of steel shell, the outer surface of steel band is located on the outside of steel shell；
(4) it is electroplated after steel shell
Nickel plating after being carried out to battery steel shell obtained by step (3) the, as shown in figure 3,2 ' table of Fe-Ni alloy/C layer on the inside of steel shell
Face forms the rear plating Ni layer 21 that steel shell bottom thickness is 0.05 μm, and the 2 " surface of Fe-Ni alloy/C layer on the outside of steel shell forms thickness
For 1 μm of rear plating Ni layer 22.
GDS-750A glow discharge spectrometry (LECO company, the U.S.) is used in the various embodiments described above, using glow discharge light
Spectrometry tests the thickness of Fe-Ni alloy/C layer, and different location carries out quantitative analysis on the same section of Fe-Ni alloy/C layer
When, it may have a certain difference, but generally influence little.
Claims (8)
1. a kind of battery steel shell, it is characterised in that: the battery steel shell stretches punching by battery steel band and formed, the inner surface position of steel band
In the inside of battery steel shell, the outer surface of the steel band is located at the outside of battery steel shell, and has on the medial surface of battery steel shell
Be coated on latter plating Ni layers of Fe-Ni alloy/C layer surface, latter plating Ni layers of battery steel shell bottom with a thickness of 0.05~0.3 μm, electricity
Have on the lateral surface of pond steel shell and be coated on latter plating Ni the layer of Fe-Ni alloy/C layer surface, this is rear plate Ni layers with a thickness of 1.0~
3.5μm；
The battery steel band includes Fe matrix, is respectively formed with Fe-Ni alloy/C layer on two faces of the Fe matrix, wherein Fe
The Fe-Ni alloy/C layer of base inner surface is with a thickness of 0.2 μm~0.9 μm, and the Fe-Ni alloy/C layer of Fe outer surface of matrix is with a thickness of 0.05
μm~0.7 μm, and the Fe-Ni alloy/C thickness degree of the Fe base inner surface is greater than the Fe-Ni alloy/C thickness of Fe outer surface of matrix
Degree；
The Fe-Ni alloy/C layer is Ni layers of thermally treated alloying of plating by Fe matrix and its surface and obtains；
The battery steel shell is obtained by following steps:
(1) steel band pre-galvanized
Nickel preplating is carried out to steel strip substrate, Ni layers of plating with a thickness of 0.2~0.6 μm are formed in the inner surface of steel band, in steel band
Outer surface forms Ni layers of plating with a thickness of 0.05~0.5 μm；
(2) steel band is heat-treated
There is the steel band of nickel coating to be heat-treated at 350 DEG C or more two sides obtained by step (1), makes Ni layers of plating of steel band two sides
Interpenetrate to form Fe-Ni alloy/C layer with the Fe matrix of border respectively, wherein steel band inner surface Fe-Ni alloy/C layer with a thickness of
0.2~0.9 μm, steel band outer surface Fe-Ni alloy/C layer with a thickness of 0.05~0.7 μm；
(3) steel shell drawing and forming
There is the steel band of Fe-Ni alloy/C layer to stretch punching into battery steel shell two sides obtained by step (2), the inner surface of steel band is located at
On the inside of steel shell, the outer surface of steel band is located on the outside of steel shell；
(4) it is electroplated after steel shell
Nickel plating after carrying out to battery steel shell obtained by step (3), the Fe-Ni alloy/C layer surface on the inside of steel shell are formed with a thickness of 0.05
Latter plating Ni layers of~0.3 μm form latter plating Ni layers with a thickness of 1.0~3.5 μm on the Fe-Ni alloy/C layer on the outside of steel shell.
2. battery steel shell according to claim 1, it is characterised in that: after battery steel shell bottom inside plate Ni layers with a thickness of
0.06~0.2 μm, latter plating Ni layers of battery steel shell outboard head portion with a thickness of 1.8~2.5 μm.
3. battery steel shell according to claim 1, it is characterised in that: the Fe-Ni alloy/C thickness of the Fe base inner surface
Degree is 0.2~1.2 μm, and the Fe-Ni alloy/C layer of Fe outer surface of matrix is with a thickness of 0.05~1.0 μm.
4. battery steel shell according to claim 3, it is characterised in that: the Fe-Ni alloy/C layer of the Fe base inner surface by
Interpenetrate to be formed with Fe matrix with a thickness of Ni layers of plating of 0.2~0.6 μm, the Fe-Ni alloy/C layer of the Fe outer surface of matrix by
It interpenetrates to be formed with Fe matrix with a thickness of Ni layers of plating of 0.05~0.5 μm.
5. a kind of preparation method of battery steel shell described in claim 1, it is characterised in that the following steps are included:
(1) steel band pre-galvanized
Nickel preplating is carried out to steel strip substrate, Ni layers of plating with a thickness of 0.2~0.6 μm are formed in the inner surface of steel band, in steel band
Outer surface forms Ni layers of plating with a thickness of 0.05~0.5 μm；
(2) steel band is heat-treated
There is the steel band of nickel coating to be heat-treated at 350 DEG C or more two sides obtained by step (1), makes Ni layers of plating of steel band two sides
Interpenetrate to form Fe-Ni alloy/C layer with the Fe matrix of border respectively, wherein steel band inner surface Fe-Ni alloy/C layer with a thickness of
0.2~0.9 μm, steel band outer surface Fe-Ni alloy/C layer with a thickness of 0.05~0.7 μm；
(3) steel shell drawing and forming
There is the steel band of Fe-Ni alloy/C layer to stretch punching into battery steel shell two sides obtained by step (2), the inner surface of steel band is located at
On the inside of steel shell, the outer surface of steel band is located on the outside of steel shell；
(4) it is electroplated after steel shell
Nickel plating after carrying out to battery steel shell obtained by step (3), the Fe-Ni alloy/C layer surface on the inside of steel shell are formed with a thickness of 0.05
Latter plating Ni layers of~0.3 μm form latter plating Ni layers with a thickness of 1.0~3.5 μm on the Fe-Ni alloy/C layer on the outside of steel shell.
6. the preparation method of battery steel shell according to claim 5, it is characterised in that: after steel band described in step (1) plates Ni
Inner surface is different from the roughness of outer surface, and the roughness of inner surface is lower than the roughness of outer surface.
7. the preparation method of battery steel shell according to claim 5, it is characterised in that: heat treatment temperature is 370 in step (2)
~750 DEG C.
8. the preparation method of battery steel shell according to claim 5, it is characterised in that: gained steel after heat treatment in step (2)
Fe-Ni alloy/C layer with inner surface is with a thickness of 0.5~0.6 μm, and the Fe-Ni alloy/C layer of outer surface is with a thickness of 0.1~0.2 μm.
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