CN102623749A - Electrical core packaging method and apparatus thereof - Google Patents
Electrical core packaging method and apparatus thereof Download PDFInfo
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- CN102623749A CN102623749A CN201110027855XA CN201110027855A CN102623749A CN 102623749 A CN102623749 A CN 102623749A CN 201110027855X A CN201110027855X A CN 201110027855XA CN 201110027855 A CN201110027855 A CN 201110027855A CN 102623749 A CN102623749 A CN 102623749A
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses an electrical core packaging method which is used for improving over charge safety performances of a polymer lithium ion battery or a flexible package lithium ion battery. The method comprises the following steps: stamping out a pit on a film prepared from a polymer material, placing an electrical core in the pit, and respectively carrying out top packaging, side packaging or pumping sealing on the film with a plurality of packaging end closures to form three packaging zones respectively, wherein at least one of the packaging zones has a packaging gap. The invention also discloses an electrical core packaging apparatus. The electrical core packaging method and the apparatus in the invention can prevent generation of cases of diaphragm contraction and rupture, short circuit in the battery, fire catching, explosion and the like caused by an uncontrolled electrochemical reaction because of failing of timely pore closing of a composite diaphragm layer at an overhigh temperature when the electrical core is in an over charge state, so the over charge safety performance of the electrical core is further improved.
Description
Technical field
The present invention relates to field of batteries, relate in particular to a kind of electric core method for packing and device that is used to improve the over-charge safety performance of polymer Li-ion battery or flexible packing lithium ion battery.
Background technology
Extensive use along with polymer Li-ion battery (Soft Roll lithium ion battery); People are also increasingly high to the attention rate of the over-charge safety performance of Soft Roll lithium ion battery; In order to prevent that the Soft Roll lithium ion battery from taking place on fire and blast under the state of overcharging, mainly isolate the measure realization over-charge protective of electric core electrode successively through the composite diaphragm layer that adopts PP (polypropylene) and PE (polyethylene) to combine.For example, when electric in-core portion temperature rose to 135 ℃, PE (polypropylene) layer took the lead in melting closed pore, and PP (polyethylene) layer maintains the original state, and stops the migration of lithium ion, thereby reached the effect of cut-off current.But overcharging in practical application flows to toward very greatly, and barrier film PE (polypropylene) can not close moment fully; And the influence of the hysteresis effect of being heated, electric in-core portion temperature can continue to increase, and anodally continues to decompose oxygen release; Make heat continue to increase with electrolyte and negative pole LiC6, Li dendrite vigorous reaction; Once reach the fusing point of PP (polyethylene), PP (polyethylene) layer also rapid contraction can occur, causes the short circuit of positive/negative plate occurrence of large-area.At this moment energy can moment sharply discharges, and organic bath is heated and takes place violent the decomposition, phenomenons such as that electric core can take place is on fire, blast.
The deficiency that the composite diaphragm layer that combines to simple PP (polypropylene) and PE (polyethylene) is isolated electric core electrode measure successively also has a kind of scheme of improving over-charging through the mode that increases electrolysis additive.Also there is certain defective in this kind over-charge protective scheme, for example, and as adding little additive, then DeGrain; As the additive that adds more amount can produce bigger negative effect to the chemical property of battery.The over-charging that how under the situation that does not influence performances such as battery circulation, to improve the Soft Roll lithium ion battery becomes a direction of lithium electricity industry research.
Summary of the invention
Technical problem to be solved by this invention is; A kind of electric core method for packing and device are provided; Can prevent the too high composite diaphragm layer of electric core Yin Wendu under the state of overcharging to fail timely closed pore, make electrochemical reaction out of control, cause barrier film to shrink, break; The battery internal short-circuit taking place, cause the generation of situation such as blast on fire, further promotes the over-charge safety performance of electric core.
In order to solve the problems of the technologies described above, embodiments of the invention provide a kind of electric core method for packing, are used to improve the over-charge safety performance of polymer Li-ion battery or flexible packing lithium ion battery, may further comprise the steps:
Active material is according to certain mixed form slurry, said slurry is coated on the copper aluminium foil processes positive/negative plate, uses composite diaphragm that said positive/negative plate is isolated successively, and assembling forms electric core;
On the film body of processing by high polymer material, stamp out the hole groove and said electric core is placed in one; Use a plurality of encapsulation end sockets respectively said film body to be carried out closedtop dress, side seal dress or bleed and seal and form respectively three encapsulation regions, at least one said encapsulation region has the encapsulation breach.
The encapsulation region and the said encapsulation region that seals of bleeding of the encapsulation region of said closedtop dress, said side seal dress all have the encapsulation breach.
Said encapsulation breach is positioned at the middle part of said electric core.
After said closedtop dress, the side seal dress step, also comprise the steps: before the said sealing step of bleeding
Electric core and said film body are carried out the overall vacuum drying, in other hole grooves of said film body, inject electrolyte, said electric core is sealed and formation process in advance.
The invention also discloses a kind of electric core packaging system, comprise a plurality of encapsulation end sockets that are used to carry out closedtop dress, side seal dress or bleed and seal, the potted ends of at least one said encapsulation end socket has the encapsulation breach.
Said encapsulation breach is triangular in shape.
Said encapsulation breach is positioned at the middle part of the potted ends of said encapsulation end socket, is to be the equilateral triangle of 2.5mm for the length of side.
A kind of electric core method for packing and device that the embodiment of the invention provided; Can prevent the too high composite diaphragm layer of electric core Yin Wendu under the state of overcharging to fail timely closed pore; Make electrochemical reaction out of control; Cause barrier film to shrink, break, the battery internal short-circuit takes place, cause the generation of situation such as blast on fire, further promote the over-charge safety performance of electric core.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the employed encapsulation end socket of electric core method for packing of the embodiment of the invention;
Fig. 2 is the structural representation through the electric core of the electric core method for packing encapsulation formation of the embodiment of the invention;
Fig. 3 is the metal box structure sketch map that the present invention is used to test aluminum plastic film fracture pressure embodiment;
Fig. 4 is the structural representation of facing of the present invention's electric core of being used to test aluminum plastic film fracture pressure embodiment;
Fig. 5 is the side-looking structural representation that the present invention is used to test the electric core of aluminum plastic film fracture pressure embodiment.
Embodiment
With reference to accompanying drawing the preferred embodiments of the present invention are described below.
A kind of electric core method for packing that the embodiment of the invention provided is used to improve the over-charge safety performance of polymer Li-ion battery or flexible packing lithium ion battery, may further comprise the steps:
The S10 active material is according to certain mixed form slurry, said slurry is coated on the copper aluminium foil processes positive/negative plate, uses composite diaphragm that said positive/negative plate is isolated successively, and assembling forms electric core;
S20 stamps out the hole groove and said electric core is placed in one on the film body of being processed by high polymer material; Use a plurality of encapsulation end sockets respectively said film body to be carried out closedtop dress, side seal dress or bleed and seal and form respectively three encapsulation regions, at least one said encapsulation region has the encapsulation breach.
Below be positive active material with LiMn2O4, ternary, graphite is negative electrode active material, the electric core of making model capacity 10Ah is the execution mode that example specifies the present invention's electricity core method for packing; In the step S10 execution mode; Active material is processed mixed slurry, on the copper aluminium foil, apply slurry, pole piece is processed in oven dry; With three layers of barrier film the both positive and negative polarity pole piece is separated, be assembled into electric core.Wherein, three layers of barrier film are composited by PP (polypropylene) and PE (polyethylene) usually, and PE (polyethylene) is positioned between two PP (polypropylene) material layer.The effect that this barrier film composite material is played in electric core over-charge protective is cut-off current, prevents that electric core from overcharging the generation that causes accidents such as blast on fire; For example; When electric in-core portion temperature rose to uniform temperature, PE (polyethylene) layer took the lead in melting closed pore, and PP (polypropylene) layer maintains the original state; Thereby realize stoping the lithium ion migration, thereby the purpose of cut-off current.
It is understandable that; The present invention's electricity core method for packing is isolated into positive/negative plate with above-mentioned employing composite diaphragm layer and implements the basis; But; Employed material of composite diaphragm layer and concrete compound form are not defined as the complex form of above-mentioned PP (polypropylene)+PE (polyethylene)+PP (polypropylene), can adopt the composite layer of other high temperature cut-off current effects.
Step S20; On the film body of processing by high polymer material, stamp out the hole groove and said electric core is placed in one; The high polymer material film body of present embodiment uses aluminum plastic film; The hole groove can use towards cheating mould and carry out punching press formation, and the size and the degree of depth of hole groove can be adjusted according to the size of actual electrical core, and electric core is placed in the groove of hole.What need to explain is, need on aluminum plastic film, stamp out a plurality of holes groove in the enforcement, and its effect also is used for splendid attire electrolyte except that placing electric core.
And then; Use a plurality of encapsulation end sockets respectively said film body to be carried out closedtop dress, side seal dress or bleed and seal; As shown in Figure 1, be the structural representation of the employed encapsulation end socket of electric core method for packing of the embodiment of the invention, encapsulation end socket 1 comprises base end 11 and is fixedly installed on the potted ends 12 on the base end 11; Wherein, Base end 11 is tabular connectors that can be fixed on the sealed in unit, and potted ends 12 is to be vertically set on the structural elements that base end 11 surfaces are used for the aluminum plastic film that coats electric core is added heat-seal, and it is similarly plate body structure.This encapsulation end socket 1 is to be that the base material processing and fabricating forms with brass or silica gel aluminium flake composite plate.During encapsulation, 1 pair of the encapsulation end socket that is oppositely arranged by two positions up and down carries out closedtop dress, side seal dress to film body or bleeds and seal.In the present embodiment; Middle part correspondence in encapsulation end socket 1 potted ends 12 is provided with the triangular breach 122 that a length of side is 2.5MM; As shown in Figure 1, the encapsulation limit of the electric core after this cover encapsulation end socket 1 encapsulation will form corresponding breach, breach 211,221,231 as shown in Figure 2.
As shown in Figure 2; The structural representation of the electric core that forms for electric core method for packing encapsulation through the embodiment of the invention, the side seal district 21 of this electricity core, closedtop district 22 and bleed and seal the breach 211,221,231 that has respectively on 23 through the above-mentioned encapsulation end socket 1 corresponding formation in encapsulation back.Just because of electric core is carried out top side envelope, side seal dress and the encapsulation end socket that seals of bleeding to have the length of side respectively be 2.5MM; Be triangular breach 122, through side seal district 21, closedtop district 22 that encapsulation forms and bleed and seal 23 and all formed breach 211,221,231.Formal because side seal district 21, the closedtop district 22 of electric core and bleed and seal 23 and have breach 211,221,231; Make the over-charge safety performance of electric core obtain lifting to a certain degree, the less characteristic of pressure that it has utilized encapsulation breach 211,221,231 places to bear is when the air pressure inside of electric core (assembling is battery after accomplishing) reaches certain value; Aluminum plastic film breaks in indentation, there easily; And discharge gas and heat, thus guaranteeing battery when overcharging, the PE layer of three layers of composite diaphragm can reach the effect of closed pore; And the PP layer maintains the original state and does not shrink, and stops thermal runaway further.Certainly; It is little that electricity in-core portion air pressure increases the numerical value that forces numeric ratio that aluminum plastic film breaks in indentation, there normally not have the electric core of breach to break, and the security performance that below will illustrate the electric core with this breach encapsulation region structure is better than the over-charge safety performance of common electrical core.
Above-mentioned table 1 for mode of the present invention to adopt encapsulation end socket by the reservation breach shown in the accompanying drawing 1 carry out side seal dress, side seal dress back, again through vacuumize, fluid injection, seal, change into, obtain the 3C10V security performance that electric core the carried out test shown in the accompanying drawing 2, the test result that draws after the operations such as partial volume, check; With
Normal mode to adopt by the encapsulation end socket of not reserving breach carry out same side seal dress, same side seal dress back, again through same vacuumize, fluid injection, seal, change into, obtain the 3C10V security performance test that electric core carries out, the test result that draws after the operations such as partial volume, check.
Can clearly find out through last table, adopt in 4 experiments of electric core under continuing the state of overcharging that encapsulate by the encapsulation end socket of not reserving breach and all cause phenomenon on fire, that smolder.In theory when electric in-core portion temperature rises to 135 ℃ of left and right sides, the PE of composite diaphragm layer (polyethylene) the layer closed pore that can take the lead in melting reach the effect of cut-off current, and the PP layer can maintain the original state, the migration of prevention lithium ion though this is.But, overcharging at big electric current and to remove, PE (polyethylene) layer can not closed moment fully; And the influence of the hysteresis effect of being heated, electric in-core portion temperature can continue to increase, and anodally continues to decompose oxygen release; And carry out violent reaction with LiC6, the Li dendrite of electrolyte and negative pole and make heat continue to increase; When the fusing point that reaches PP (polypropylene), PP (polypropylene) layer also rapid contraction can occur, causes the short circuit of positive/negative plate occurrence of large-area.At this moment, energy will sharply discharge moment, and organic bath is heated and takes place violent the decomposition, causes on fire, the phenomenon of smoldering of the electric core shown in the above-mentioned table one.
And adopt during under continuing the state of overcharging 4 times of electric core that the encapsulation end socket by the reservation breach shown in the accompanying drawing 1 encapsulates test; Side seal district 21, closedtop district 22 take place respectively or bleed and seal 23 situation of breaking in indentation, there in the electricity core when 110 ℃, 108 ℃, 109 ℃ and 105 ℃, also do not have on fire or smolder.That is to say that the less characteristic of pressure of having utilized encapsulation breach 211,221,231 places to bear is when the air pressure inside of battery reaches certain value; Aluminum plastic film just breaks at breach 211,221 or 231 places; And discharge gas and heat, thus guaranteeing battery when overcharging, the PE layer in three layers of composite diaphragm can reach the effect of closed pore; And the PP layer maintains the original state and does not shrink, and stops thermal runaway further.
For further specifying the over-charge safety performance of making the electric core that forms through the electric core method for packing of the embodiment of the invention, below the difference of package strength before and after changing of electric core is described with experimental data:
With the thickness of meaning as shown in Figure 3 is 4mm, and length is the through hole 32 that six faces of the metal square 3 of 20mm are all got through 2mm, puts it in the middle of the aluminum plastic film, encapsulates.Adopt the anchor clamps 5 of band pin hole that tracheae 4 is fixing tight with metal square 3 then, prevent to lose heart, tracheae 4 other end tape splicings have barometric liquid nitrogen.Through this end metal square 3 is ventilated, the burst pressure of MEASUREMENT OF Al plastic film is like Fig. 4, shown in Figure 5.Adopt device shown in the present to seal pressure test; Increase along with pressure; Aluminum plastic film pops from 211,221 or 231, and the fracture pressure mean value of repeatedly measuring is at 0.2MPa, and is 0.3MPa through the fracture pressure that common encapsulation end socket encapsulates the aluminum plastic film of electric core.
The test data result of above-mentioned two tests shows, when adopting the electric core of the embodiment of the invention electricity core method for packing manufacturing internal pressure reaching certain pressure under the state of overcharging, aluminum plastic film can break in indentation, there; And release gas and heat; Thereby guarantee battery when overcharging, the PE layer in three layers of composite diaphragm can reach the effect of closed pore, and the PP layer maintains the original state and do not shrink; Stop thermal runaway further, further improved the over-charge safety performance of electric core.
In other execution modes of the electric core method for packing of the embodiment of the invention; The position of breach is set the encapsulation end socket and the shape of breach does not limit; Can be other shapes except that above-mentioned execution mode equilateral triangle; As square, shape such as trapezoidal, breach can be arranged on the end of encapsulation end socket or the optional position at middle part.Certainly, in the whole encapsulation process, can use the encapsulation end socket that has breach that any one or more encapsulation regions of three encapsulation regions are had the aluminum plastic film encapsulation of breach, other adopt the encapsulation of common forms also can.Also can control the ability that encapsulation region bears cell internal pressure, reach use and do not add the safe over-charging of the electrolyte of overcharging additive and be consistent with the over-charge safety performance that adds overcharging additive through controlling the size and shape of defective mouth well.
The embodiment of the invention also discloses a kind of electric core packaging system, comprise a plurality of encapsulation end sockets that are used to carry out closedtop dress, side seal dress or bleed and seal, the potted ends of at least one said encapsulation end socket has the encapsulation breach.Above-mentioned packaging system mainly is made up of the encapsulation end socket with breach, and embodiment is described in detail in the above-described embodiment, repeats no more.
Electric core method for packing and the device of embodiment of the present invention embodiment; Can prevent under the state of overcharging the too high composite diaphragm layer of Yin Wendu to fail timely closed pore; Make electrochemical reaction out of control; Cause barrier film to shrink, break, the battery internal short-circuit takes place, cause the generation of situation such as blast on fire, further promote the over-charge safety performance of electric core.
Above disclosedly be merely preferred embodiment of the present invention, can not limit the present invention's interest field certainly with this, the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (7)
1. electric core method for packing is used to improve the over-charge safety performance of polymer Li-ion battery or flexible packing lithium ion battery, it is characterized in that, may further comprise the steps:
Active material is according to certain mixed form slurry, said slurry is coated on the copper aluminium foil processes positive/negative plate, uses composite diaphragm that said positive/negative plate is isolated successively, and assembling forms electric core;
On the film body of processing by high polymer material, stamp out the hole groove and said electric core is placed in one; Use a plurality of encapsulation end sockets respectively said film body to be carried out closedtop dress, side seal dress or bleed and seal and form respectively three encapsulation regions, at least one said encapsulation region has the encapsulation breach.
2. electric core method for packing as claimed in claim 1 is characterized in that, the encapsulation region and the said encapsulation region that seals of bleeding of the encapsulation region of said closedtop dress, said side seal dress all have the encapsulation breach.
3. electric core method for packing as claimed in claim 2 is characterized in that said encapsulation breach is positioned at the middle part of said electric core.
4. electric core method for packing as claimed in claim 1 is characterized in that, after said closedtop dress, the side seal dress step, also comprises the steps: before the said sealing step of bleeding
Electric core and said film body are carried out the overall vacuum drying, in other hole grooves of said film body, inject electrolyte, said electric core is sealed and formation process in advance.
5. an electric core packaging system is characterized in that, comprises a plurality of encapsulation end sockets that are used to carry out closedtop dress, side seal dress or bleed and seal, and the potted ends of at least one said encapsulation end socket has the encapsulation breach.
6. electric core packaging system as claimed in claim 5 is characterized in that said encapsulation breach is triangular in shape.
7. electric core packaging system as claimed in claim 6 is characterized in that said encapsulation breach is positioned at the middle part of the potted ends of said encapsulation end socket, is to be the equilateral triangle of 2.5mm for the length of side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110027855XA CN102623749A (en) | 2011-01-26 | 2011-01-26 | Electrical core packaging method and apparatus thereof |
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| CN201110027855XA CN102623749A (en) | 2011-01-26 | 2011-01-26 | Electrical core packaging method and apparatus thereof |
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| CN105336888A (en) * | 2014-07-17 | 2016-02-17 | 宁德新能源科技有限公司 | Battery module |
| CN105938879A (en) * | 2015-03-04 | 2016-09-14 | 太阳诱电株式会社 | Electric storage cell, covering film and electric storage module |
| CN108828384A (en) * | 2018-02-28 | 2018-11-16 | 中国电力科学研究院有限公司 | A kind of simulator and analogy method of battery internal short-circuit |
| US10381171B2 (en) | 2015-03-04 | 2019-08-13 | Taiyo Yuden Co., Ltd. | Electric storage cell, covering film and electric storage module |
| CN110504392A (en) * | 2018-05-18 | 2019-11-26 | 宁德新能源科技有限公司 | Battery |
| CN111735707A (en) * | 2020-06-29 | 2020-10-02 | 天津市捷威动力工业有限公司 | Method and device for testing packaging strength of lithium ion soft package battery |
| CN112490492A (en) * | 2020-11-27 | 2021-03-12 | 珠海冠宇动力电池有限公司 | Lithium ion battery and manufacturing method thereof |
| CN113092268A (en) * | 2021-04-01 | 2021-07-09 | 合肥国轩高科动力能源有限公司 | Soft package battery cell voltage withstand test method |
| CN113140844A (en) * | 2021-05-06 | 2021-07-20 | 深圳新源柔性科技有限公司 | Thin film device packaging head, device, equipment and packaging method |
| CN114204126A (en) * | 2021-11-10 | 2022-03-18 | 安徽南都华拓新能源科技有限公司 | Permeable baking method for lithium ion battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9806307B2 (en) | 2014-07-17 | 2017-10-31 | Ningde Amperex Technology Limited | Battery module |
| CN105336888B (en) * | 2014-07-17 | 2018-04-24 | 宁德新能源科技有限公司 | Battery modules |
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| CN105938879A (en) * | 2015-03-04 | 2016-09-14 | 太阳诱电株式会社 | Electric storage cell, covering film and electric storage module |
| US10381171B2 (en) | 2015-03-04 | 2019-08-13 | Taiyo Yuden Co., Ltd. | Electric storage cell, covering film and electric storage module |
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| CN108828384B (en) * | 2018-02-28 | 2023-12-19 | 中国电力科学研究院有限公司 | Simulation device and simulation method for internal short circuit of battery |
| CN108828384A (en) * | 2018-02-28 | 2018-11-16 | 中国电力科学研究院有限公司 | A kind of simulator and analogy method of battery internal short-circuit |
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| CN111735707A (en) * | 2020-06-29 | 2020-10-02 | 天津市捷威动力工业有限公司 | Method and device for testing packaging strength of lithium ion soft package battery |
| CN112490492A (en) * | 2020-11-27 | 2021-03-12 | 珠海冠宇动力电池有限公司 | Lithium ion battery and manufacturing method thereof |
| CN113092268A (en) * | 2021-04-01 | 2021-07-09 | 合肥国轩高科动力能源有限公司 | Soft package battery cell voltage withstand test method |
| CN113140844A (en) * | 2021-05-06 | 2021-07-20 | 深圳新源柔性科技有限公司 | Thin film device packaging head, device, equipment and packaging method |
| CN113140844B (en) * | 2021-05-06 | 2024-04-16 | 深圳新源柔性科技有限公司 | Thin film device packaging head, device, equipment and packaging method |
| CN114204126A (en) * | 2021-11-10 | 2022-03-18 | 安徽南都华拓新能源科技有限公司 | Permeable baking method for lithium ion battery |
| CN114204126B (en) * | 2021-11-10 | 2024-03-29 | 安徽南都华拓新能源科技有限公司 | Penetrating type baking method for lithium ion battery |
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Application publication date: 20120801 |