CN101533927B - Method for manufacturing lithium ion battery - Google Patents

Method for manufacturing lithium ion battery Download PDF

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Publication number
CN101533927B
CN101533927B CN2009101195839A CN200910119583A CN101533927B CN 101533927 B CN101533927 B CN 101533927B CN 2009101195839 A CN2009101195839 A CN 2009101195839A CN 200910119583 A CN200910119583 A CN 200910119583A CN 101533927 B CN101533927 B CN 101533927B
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CN
China
Prior art keywords
hollow tube
battery
encapsulation bag
bag
lithium ion
Prior art date
Application number
CN2009101195839A
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Chinese (zh)
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CN101533927A (en
Inventor
林道勇
Original Assignee
林道勇
山东润峰集团新能源科技有限公司
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Priority to CN2009101195839A priority Critical patent/CN101533927B/en
Publication of CN101533927A publication Critical patent/CN101533927A/en
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Publication of CN101533927B publication Critical patent/CN101533927B/en

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • H01M10/0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/058Construction or manufacture
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/116Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention relates to a method for manufacturing lithium ion battery, which includes steps of packaging at least one hollow pipe on a package bag of a battery, and vacuumizing the battery through the hollow pipe. The invention also provides a package bag for the lithium ion battery, wherein the hollow pipe is arranged at side edge of the package bag for vacuumizing in battery manufacturing process. The invention can be used to manufacture flexible package lithium ion battery with different sizes, shapes and capacities, has simple process and production equipment, and is favorable to improve battery performance.

Description

A kind of manufacture method of lithium ion battery
Technical field
The present invention relates to a kind of manufacture method of lithium ion battery, refer more particularly to a kind of manufacture method of lithium ion battery of flexible package.
Background technology
Lithium ion battery is since nineteen nineties succeeds in developing, because it has the energy height, have extended cycle life, operating voltage height, special advantages such as pollution-free, now be widely used in the electronic apparatuss such as mobile phone, digital camera, notebook computer, and progressively to electric bicycle, electric automobile, fields such as stand-by power supply are expanded and are used.If lithium ion battery can be divided into two kinds by the battery case packaged form, a kind of is hard packaging lithium ionic cell, usually with box hat or aluminum hull packing; Another kind is a flexible packing lithium ion battery, with soft aluminum-plastic composite membrane packing, also is divided into liquid flexible packing lithium ion electric pond and polymer Li-ion battery two classes usually.Flexible packing lithium ion battery is in light weight because of it, security performance good, cost is low is promoted rapidly.
The aluminum-plastic composite membrane packing that flexible packing lithium ion battery is used, general skin is a nylon, and the intermediate layer is an aluminium foil, and internal layer is polypropylene or polyethylene, its design philosophy mainly is to utilize the compactness between the metallic atom of aluminium foil to intercept moisture, oxygen etc., thereby prevents the lithium ion battery performance degradation; Utilize polypropylene or poly polymer characteristics, play preventing battery short circuit, be convenient to battery is made in heat-sealing under the condition of uniform temperature, pressure and time (heat merges) with sealing effect.Because the special high performance requirements of aluminum-plastic composite membrane, the aluminum-plastic composite membrane price is also than higher.
In the lithium ion battery production process, moisture can produce great destruction to the performance of battery, therefore battery will be carried out depth drying before battery liquid-filling, and when fluid injection, under the condition of anhydrous and anaerobic, carry out as far as possible, 200510016706.8 pairs of traditional manufacturing process of Chinese patent are improved, this patent provides a kind of battery base envelope, and use this battery base envelope through battery base envelope, battery base envelope is got through the hole, depth drying and filling with inert gas, the opening of closing battery base envelope, add electrolyte solution, place activation, change into go-on-go, seal and separate guide ring end, the technology of battery shaping and marking is made lithium ion battery, realize the manufacturing of flexible packing lithium ion battery in this bag, though can be implemented under local anaerobic and the anhydrous condition and make lithium ion battery, but fabrication schedule complexity, complex operation, and can not avoid battery material to touch airborne moisture fully, so that influence the performance of battery.
It is wetting to begin electrolyte behind the battery liquid-filling, its objective is electrolyte is uniformly distributed in pole piece and the barrier film, discharges the gas in the electrode material micropore, to improve the performance of battery.Need special use and expensive fluid injection and wetting apparatus just can reach good wetting effect in the existing manufacture method.
After battery is wetting, when changing into first, lithium ion battery can form SEI film (SolidElectrolyte Interface) in negative terminal surface, and meeting produces a large amount of gases in the forming process of SEI film, again because lithium ion battery is very responsive to moisture, a spot of water just can cause fatefulue destruction to the performance of lithium ion battery, therefore a large amount of gases that form can not directly discharge, otherwise battery will occur contacts with airborne moisture, the result who causes battery performance to worsen, therefore in the manufacture process of traditional flexible packing lithium ion battery, as shown in Figure 1, all be battery 1 to be packed into seal in the aluminum-plastic composite membrane bag 2 of air bag 3, before sack seals fully, inject electrolyte with certain area.When battery changes into, the a large amount of gases that produce when the SEI film forms enter air bag 3, after changing into end, again aluminum-plastic composite membrane bag 2 is put into special-purpose vacuum suction heat-sealing equipment, to be pumped near vacuum in the aluminum-plastic composite membrane bag 2 after air bag 3 punctured, and near one side of battery 1 with aluminum-plastic composite membrane heat seal sealing, cut off air bag 3 at last, shaping the battery of sealing.The shortcoming of this manufacture method: the one, to excise as the aluminum-plastic composite membrane of air bag, as waste disposal, wasted expensive aluminum-plastic composite membrane; To puncture air bag with the vacuum suction heat-sealing equipment of special use on the other hand and seal, the equipment cost height, versatility is low.
For in formation process, can discharge the encapsulation of each interlayer of inside battery the time residual gas and when changing into the newly-generated gas of reaction, make it tight contact, electrolyte is evenly distributed comprehensively, thereby guarantee that high-quality finishes changing in negative terminal surface of battery and form fine and close SEI film uniformly, conventional method generally adopts when changing into battery is fixed between two flat boards of band pressue device, makes residual air scavenge thereby apply certain pressure then as far as possible.There is troublesome poeration in this method, and pressure be difficult to guarantee evenly, and also has portion gas when changing into and rest on inside battery.
Therefore make flexible packing lithium ion battery with conventional method, the one, the pouch material aluminum-plastic composite membrane packaging material that waste is expensive; The 2nd, need vacuum suction heat-sealing equipment expensive and that versatility is low; The 3rd, need strictly controlled environment moisture, battery liquid-filling and wetting apparatus cost height when in air bag, injecting electrolyte; The 4th, existing mode of exerting pressure to battery is got rid of the method troublesome poeration of gas when changing into, and pressure is difficult to guarantee evenly the damage battery performance.
Summary of the invention
Technical problem to be solved by this invention provides a kind of lithium ion battery manufacture method, and its manufacture process is simple, does not need equipment such as the low liquid-injection equipment of costliness and versatility, vacuum suction heat-sealing equipment.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of manufacture method of lithium ion battery, may further comprise the steps: the encapsulation bag that battery will be housed seals in advance, and hollow tube one end opening is encapsulated in the encapsulation bag, other end opening places outside the encapsulation bag, sealing around the described encapsulation bag communicates with the external world by hollow tube; Vacuumize: will encapsulate bag and be connected with vaccum-pumping equipment by hollow tube and to vacuumize; Inject electrolyte, and leave standstill; Change into, vacuumize; With described hollow tube heat-sealing, shaping makes the lithium ion battery finished product.
The beneficial effect of this scheme is: this method has realized vacuum exhaust, but and the pouch material aluminum-plastic composite membrane of conserve expensive, technological process is simple, uses general common apparatus to finish, and this method is not only saved cost and helped improving the performance of lithium ion battery.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described injection electrolyte is: liquid-injection equipment is connected injection electrolyte by described hollow tube with the encapsulation bag of battery.
The beneficial effect that adopts above-mentioned further scheme is to realize vacuum fluid injection in the battery, electrolyte evenly injects in the battery under the atmospheric effect in the external world naturally, and the even wet processes of finishing vacuum condition is used general liquid-injection equipment and can be realized, simple to operate, and help improving battery performance.
Further, change into the mode that vacuumizes by described hollow tube simultaneously and discharge gas.
Further, change into the back by hollow tube to battery vacuum-pumping.
The beneficial effect that adopts above-mentioned further scheme is to adopt general vacuum-pumping equipment to realize, simple to operate, easily realize, and be beneficial to the gas of getting rid of residual gas in the battery and producing when changing into, help avoiding because the interior residual gas of battery influences battery performance.
The technical scheme that the present invention solves the problems of the technologies described above also comprises as follows: a kind of encapsulation bag of lithium ion battery, in the bag battery is housed, the side of this encapsulation bag is provided with hollow tube, the opening of this hollow tube one end is enclosed in the encapsulation bag, the opening of the other end places outside this encapsulation bag, and this hollow tube communicates with the external world.
The beneficial effect of this scheme is: have the lithium ion battery encapsulation bag of hollow tube, can improve the manufacturing process of lithium ion battery greatly, do not need the low liquid-injection equipment of costliness and versatility, vacuum suction heat-sealing equipment etc. can realize the manufacturing of battery.
Further, the side of described encapsulation bag also is provided with liquid injection hole or fluid injection limit.
The beneficial effect that adopts above-mentioned further scheme is the convenient fluid injection process that adopts the mode that has liquid injection hole or fluid injection limit now to finish battery.
Further, described hollow tube places the outer opening part of encapsulation bag to be provided with Capsule.
The beneficial effect that adopts above-mentioned further scheme is in the manufacturing process of lithium ion battery, use Capsule to seal up hollow tube after vacuumizing and be exposed at an airborne end opening, help preventing that air enters in the battery by hollow tube in manufacture process, thereby influence battery performance.
Further, described hollow tube has identical fusing point or material with described encapsulation bag internal layer.
The beneficial effect that adopts above-mentioned further scheme is that to help the part sealing that hollow tube and encapsulation bag contact tight, prevents that sealing place of air by hollow tube and encapsulation bag heat-sealing limit from entering in the encapsulation bag.
Further, if the material of described encapsulation bag is an aluminum-plastic composite membrane, described hollow tube is PA tube or polyethylene pipe.
The beneficial effect that adopts above-mentioned further scheme is that to help the part sealing that hollow tube and encapsulation bag contact tight, prevents that sealing place of air by hollow tube and encapsulation bag heat-sealing limit from entering in the encapsulation bag.
Further, the quantity of described hollow tube is at least one.
The beneficial effect that adopts above-mentioned further scheme is the quantity that hollow tube conveniently is set according to the actual conditions such as capacity, shape and size of lithium ion battery to be processed, makes things convenient for the processing and manufacturing of battery.
Further, described hollow tube is arranged on the either side of described encapsulation bag or is arranged on many sides simultaneously.
The beneficial effect that adopts above-mentioned further scheme is the position that can arrange hollow tube to be provided with according to actual needs.
Description of drawings
Fig. 1 is the schematic diagram of traditional flexible packing lithium ion battery manufacture method;
Fig. 2 is the structural representation of the encapsulation bag of lithium ion battery of the present invention;
Fig. 3 is the block diagram of the embodiment one of the manufacture method of lithium ion battery of the present invention;
Fig. 4 is the block diagram of the embodiment two of the manufacture method of lithium ion battery of the present invention;
Fig. 5 is the block diagram of the embodiment three of the manufacture method of lithium ion battery of the present invention;
In the accompanying drawing, the list of parts of each label representative is as follows:
1, battery, 2, encapsulation bag, 3, air bag, 4, the heat-sealing limit, 5, hollow tube, 6, Capsule
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and feature are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
As shown in Figure 2, the encapsulation bag of a kind of lithium ion battery provided by the present invention, three sides of encapsulation bag 2 are equipped with battery 1 for heat-sealing limit 4 in the bag, this battery 1 is made by positive/negative plate, barrier film, be provided with hollow tube 5 on arbitrary heat-sealing limit 4 of this encapsulation bag, hollow tube 5 one end openings place in the encapsulation bag, and other end opening places outside the encapsulation bag, and be provided with Capsule 6 at this end, with hollow tube sealing, prevent that ambient atmos etc. from entering in the bag after being used to vacuumize, also replacement such as available triple valve of Capsule 6.During use, battery is packed in the encapsulation bag 2, and two heat-sealing limits 4 that will encapsulate on the bag seal, wire will be inserted again in the hollow tube 5 afterwards, and place on encapsulation bag 2 sides that do not seal, should encapsulate the heat-sealing of limit and hollow tube, pull out wire after the heat-sealing, at this moment, this encapsulation bag only is in communication with the outside by this hollow tube 5.Perhaps in above-mentioned heat seal process, leave a fluid injection limit or on arbitrary heat-sealing limit, reserve a fluid injection through hole, be used for fluid injection.In addition, can on the encapsulation bag, a plurality of hollow tubes 5 be set according to actual needs, and can be arranged on as required on a plurality of heat-sealings limit of encapsulation bag 2.The fusing point of this hollow tube 5 or material are identical with encapsulation bag 2 internal layers, thereby make hollow tube tighter with 4 heat-sealings of heat-sealing limit.General encapsulation bag 2 is the aluminum-plastic composite membrane bag, and hollow tube then generally adopts PA tube preferable, and next adopts polyethylene pipe.
The length of hollow tube 5 and size can determine that the internal diameter of general hollow tube is approximately 0.4~1.6mm according to capacity, shape or the size of battery, and external diameter is approximately 1.0~2.0mm, and hollow tube length is approximately 30~100mm.For example, make the liquid flexible packing lithium ion electric pond of 100Ah, long 290mm, high 240mm, thick 25mm, employing length is the hollow tube of 90mm, internal diameter 1.2mm, external diameter 1.6mm; Make the polymer Li-ion battery of 50Ah, long 240mm, high 180mm, thick 20mm, then use the hollow tube of length as 60mm, internal diameter 0.8mm, external diameter 1.3mm; Make the polymer Li-ion battery of 10Ah, long 215mm, high 90mm, thick 9mm, choose length and be the hollow tube of 40mm, internal diameter 0.5mm, external diameter 1.0mm and be advisable.
Embodiment one
As shown in Figure 3, the embodiment one of the manufacture method of lithium ion battery provided by the present invention may further comprise the steps:
Step 301: the encapsulation bag is pre-to be sealed: battery is packed into to be encapsulated in the bag, to encapsulate other heat-sealing limits of bag all seals tightly, end opening with a hollow tube places in the heat-sealing limit of encapsulation bag then, other end opening places outside the encapsulation bag, during heat-sealing at the built-in wire of hollow tube, after sealing the wire removal is got final product, make the encapsulation bag only communicate with the external world by hollow tube;
Step 302: vacuumize: hollow tube is connected with the pump-line of vaccum-pumping equipment, the encapsulation bag is vacuumized, when vacuum degree reaches the lithium ion battery manufacture process requirement in the encapsulation bag, clamp hollow tube, the disconnection hollow tube is connected with vacuum pipe, blended rubber cap or triple valve seal hollow tube, make that encapsulating in the bag is vacuum, and do not communicate with the external world;
Step 303: fluid injection: remove the Capsule of hollow tube or place the outer opening of encapsulation bag to open and this end opening is connected with the fluid injection pipeline of liquid-injection equipment hollow tube by triple valve, because in the encapsulation bag is vacuum, and liquid-injection equipment to be in the natural environment be under the atmospheric environment, therefore electrolyte can flow in the encapsulation bag by nature, this fluid injection mode is simple, and required liquid-injection equipment is simple; After fluid injection finishes, hollow tube disconnected and by sealings such as Capsules, the encapsulation bag leaves standstill and carries out wettingly, owing to be vacuum before the fluid injection in the bag, so battery is wetting more even, and need not special wetting apparatus;
Step 304: change into: the both positive and negative polarity that will encapsulate the battery on the bag is connected with the corresponding both positive and negative polarity of formation device, changes into battery;
Step 305: after changing into end, repeating step 302;
Step 306: the heat-sealing limit that will be provided with hollow tube tightly seals, and then hollow tube is placed the outer part of cell package bag to remove, and makes to encapsulate bag sealing fully, and interior is vacuum, does not communicate with the external world; After the sealing, the battery finished product is promptly made in the battery shaping.
In the process that said method carries out, employed vaccum-pumping equipment adopts general vacuum pump to realize, does not need to use costliness and the low vacuum equipment of versatility, can reduce to make the equipment cost of lithium ion battery greatly; Fluid injection adopts simple device to finish, and the wet processes after the fluid injection also need not special-purpose wetting apparatus and can realize evenly wettingly, not only reduces equipment cost, and the manufacturing process of battery is simple to operation, and the battery performance that makes is stable; Changing into the back vacuumizes battery and can avoid effectively that thereby residual gas influences battery life or result of use in the battery.
Embodiment two
As shown in Figure 4, present embodiment is identical with the foregoing description one other steps of described method, and different is:
Step 401: in the heat-sealing process in advance, encapsulation bag except that by hollow tube with the external world communicates, also reserve a heat-sealing limit as the fluid injection limit or seal the limit one and reserve a fluid injection through hole, be used for fluid injection;
Step 402: vacuumize: hollow tube is sealed with Capsule, and the back is connected vaccum-pumping equipment by fluid injection limit or the fluid injection through hole of reserving with the encapsulation bag, vacuumize;
Step 403 item is: charge into dry gas, finish the fluid injection process by fluid injection limit or the fluid injection through hole reserved then, after fluid injection finishes, with this fluid injection limit or the heat-sealing of fluid injection through hole.
Step 405: the Capsule of hollow tube is opened, used as method as described in the step 302 among the embodiment one to vacuumize.
Embodiment three
As Fig. 5, shown in Figure 6, present embodiment is identical with the foregoing description one or embodiment two other steps of described method, different is: vacuumize when changing into battery in the step that changes into, thereby can when changing into, gas newly-generated in gas residual in the battery and the formation process be discharged, realize changing under the vacuum state.Pressure was even when battery changed into, and the gas savings of effectively avoiding residual gas in the battery or changing into generation is in battery, thereby reached the effect that improves battery performance.
The manufacture method of above-mentioned lithium ion battery is applicable to the making of the flexible packing lithium ion battery of various capacity, shape and size, and technology is simple, and equipment cost is low, can effectively save the materials used of packaging bag, and helps improving battery performance.Battery in the foregoing description can be packed in the heat-sealing of encapsulation bag, also can change into and will encapsulate the part side heat-sealing that bag contains hollow tube earlier according to the actual production flow process, after battery is not packed into by sealing side, make this encapsulation bag only communicate with the external world by hollow tube or liquid injection hole or fluid injection limit.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (11)

1. the manufacture method of a lithium ion battery is characterized in that may further comprise the steps:
The encapsulation bag that battery is housed is sealed in advance, and hollow tube one end opening is encapsulated in the encapsulation bag, other end opening places outside the encapsulation bag, and sealing around the described encapsulation bag communicates with the external world by hollow tube;
Vacuumize: will encapsulate bag and be connected with vaccum-pumping equipment by hollow tube and to vacuumize;
Inject electrolyte, and leave standstill;
Change into, vacuumize;
With described hollow tube heat-sealing, shaping makes the lithium ion battery finished product.
2. manufacture method according to claim 1 is characterized in that, described injection electrolyte is: liquid-injection equipment is connected injection electrolyte by described hollow tube with the encapsulation bag of battery.
3. manufacture method according to claim 1 is characterized in that, changes into the mode that vacuumizes by described hollow tube simultaneously and discharges gas.
4. manufacture method according to claim 1 is characterized in that, change into the back by hollow tube to battery vacuum-pumping.
5. the encapsulation bag of a lithium ion battery is equipped with battery in the bag, it is characterized in that, the side of this encapsulation bag is provided with hollow tube, and the opening of this hollow tube one end is enclosed in the encapsulation bag, and the opening of the other end places outside this encapsulation bag, and this hollow tube communicates with the external world.
6. encapsulation bag according to claim 5 is characterized in that the side of described encapsulation bag also is provided with liquid injection hole or fluid injection limit.
7. encapsulation bag according to claim 5 is characterized in that, described hollow tube places the outer opening part of encapsulation bag to be provided with Capsule.
8. encapsulation bag according to claim 5 is characterized in that, described hollow tube has identical fusing point or material with described encapsulation bag internal layer.
9. encapsulation bag according to claim 8 is characterized in that the material of described encapsulation bag is an aluminum-plastic composite membrane, and described hollow tube is PA tube or polyethylene pipe.
10. encapsulation bag according to claim 5 is characterized in that the quantity of described hollow tube is at least one.
11., it is characterized in that described hollow tube is arranged on the either side of described encapsulation bag or is arranged on many sides simultaneously according to the arbitrary described encapsulation bag of claim 5 to 10.
CN2009101195839A 2009-03-17 2009-03-17 Method for manufacturing lithium ion battery CN101533927B (en)

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CN2009101195839A CN101533927B (en) 2009-03-17 2009-03-17 Method for manufacturing lithium ion battery
PCT/CN2010/071108 WO2010105565A1 (en) 2009-03-17 2010-03-17 Method for manufacturing lithium ion battery and package bag of lithium ion battery

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CN101533927B true CN101533927B (en) 2010-09-29

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CN101552358A (en) * 2009-05-14 2009-10-07 林道勇 Production method and encapsulating shell of lithium ion battery
CN102738502B (en) * 2011-04-15 2016-03-23 比克国际(天津)有限公司 Short test lithium ion battery and preparation method thereof in forcing
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