CN105036062A - Manufacture method for micro-electromechanical system (MEMS) lithium battery - Google Patents
Manufacture method for micro-electromechanical system (MEMS) lithium battery Download PDFInfo
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- CN105036062A CN105036062A CN201510381891.4A CN201510381891A CN105036062A CN 105036062 A CN105036062 A CN 105036062A CN 201510381891 A CN201510381891 A CN 201510381891A CN 105036062 A CN105036062 A CN 105036062A
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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
Abstract
The invention discloses a manufacture method for a micro-electromechanical system (MEMS) lithium battery. The manufacture method comprises the steps of manufacturing a first shell and a second shell separately; and then packaging the first shell and the second shell together so as to form the battery. A cavity is formed in the first shell, and a positive electrode of the battery is integrated in the cavity. The second shell is made from a material the same as the material of the first shell. A cavity docking with the first shell is formed on the second shell. A negative electrode of the battery is integrated in the cavity. The manufacture method for the lithium battery is simple, can produce the lithium batteries in volume, lowers the production cost, and can greatly improve the consistency and reliability of battery preparation; the two dimensional structure of the electrode is changed into the three dimensional structure, so that the surface area of the electrode is greatly increased, the charge transfer resistance is reduced, the ion transference number is improved, and the energy density and power density of the battery are greatly improved; and the ion transference path can be shortened, and the battery charging time can be shortened.
Description
Technical field
The present invention relates to battery manufacturing field, relate more specifically to a kind of manufacture method of MEMS lithium battery.
Background technology
MEMS (Micro-Electro-MechanicalSystem, MEMS), also microelectromechanical systems, micro-system or micromechanics is called, microelectric technique (semiconductor fabrication) basis grows up, has merged the high-tech electronic mechanical devices of the fabrication techniques such as photoetching, burn into film, LIGA, silicon micromachined, non-silicon micromachined and precision optical machinery processing.
MEMS integrate microsensor, microactrator, micro mechanical structure, the micro-energy of micro battery, signal transacting with control circuit, high-performance electronic integrated device, interface, communicate, it is a revolutionary new technology, be widely used in new high-tech industry, its system dimension is at several millimeters and even less, and its internal structure is generally in micron even nanometer scale.MEMS can be mass-produced, common product comprises mems accelerometer, MEMS microphone, micro motor, Micropump, micro-oscillator, MEMS optical pickocff, MEMS pressure sensor, MEMS gyro instrument, MEMS humidity sensor, MEMS gas sensor etc., and their integrated products.
The development of MEMS technology, brings the change of a lot of technology and material, wherein for a lot of independently MEMS device, because size is little especially, there is provided the energy more difficult to it, as the branch of MEMS technology, current micro-energy part mainly comprises fuel cell.But all also there is place not fully up to expectations in postcombustion, generation in gaseous product, service life etc. in fuel cell.
Summary of the invention
In view of this, one of main purpose of the present invention is to provide a kind of MEMS lithium battery and manufacture method thereof, thus micro code-lock technique can be utilized to manufacture lithium battery.
To achieve these goals, the invention provides a kind of preparation method of MEMS lithium battery, comprise the following steps:
With the substrate that semi-conducting material is the first housing, form the first extraction electrode, the first three-dimensional column array and the first pond body thereon, wherein said first three-dimensional column array is arranged in described first pond body;
Modify in described first three-dimensional column array surface and fix the first nano material as positive pole;
Profit uses the same method, prepare the second housing comprising negative pole, described second housing is formed the second extraction electrode, the second three-dimensional column array and the second pond body, and fix the second nano material as negative pole in described second three-dimensional column array surface modification, wherein said second three-dimensional column array is arranged in described second pond body, and described second pond body is aimed at formation one with described first pond body and held cavity, described first three-dimensional column array and described second three-dimensional column array offset one from another;
Described first housing and the second housing are aimed at and encapsulated, forms the housing of described MEMS lithium battery.
Wherein, described first housing and the second housing being aimed at described and after the step encapsulated, also comprise and inject electrolyte from reserved note sample hole, matter to be electrolysed is full of sealing note sample hole after the body of pond, thus obtains the step of described MEMS lithium battery.
Wherein, after the step of the second nano material as negative pole is fixed in described second three-dimensional column array surface modification, described first housing and the second housing are aimed at and before the step encapsulated, is also included in the step of the Chi Tizhong filling colloidal electrolyte on described first housing and the second housing.
Wherein, on described the first/the second housing, form described the first/the second pond body by deep etching or chemical etching technology and be arranged in the reserved column of described the first/the second pond body, on described reserved column, forming described the first/the second three-dimensional column array by photoetching process.
Wherein, described semi-conducting material is silica-based, carbon back or GaAs material.
Wherein, in the step of described formation the first/the second extraction electrode in substrate, comprise and form the step of Au/Cr metal level as mask on the substrate, wherein said Au layer thickness is 100 ~ 500nm, Cr layer thickness is 10 ~ 50nm.
Wherein, described Au layer thickness is 200nm, Cr layer thickness is 20nm.
Wherein, the preparation order in no particular order of the first housing comprising positive pole described in and the second housing comprising negative pole.
Wherein, described by the step of the first housing and the second packaging shell, adopt bonded seal or BCB sealing technology.
Wherein, before described first extraction electrode of formation and/or the second extraction electrode, on the upper surface of substrate of described first housing and/or the second housing, the first boss and/or the second boss is formed by deep etching or chemical etching technology, thus in etching process procedure thereafter, utilize described first boss and the second boss to form interdigital structure.
Known based on technique scheme, MEMS lithium battery of the present invention has the following advantages and beneficial effect: (1) the present invention adopts silicon as substrate, utilize bulk silicon technological, the positive pole of three-dimensional body structure, negative pole and battery pond body is processed on silica-based at 2 respectively, its preparation technology is relatively simple, can mass production, reduce production cost; (2) different silica-based on, prepare positive pole and negative pole respectively, can avoid modifying fixing positive electrode and negative material mixes interference mutually, cause electric pole short circuit, significantly can improve uniformity and reliability prepared by battery; (3) support of miniature silicon column array as electrode (positive pole and negative pole) is processed on a silicon substrate, electrode can be made to become three-dimensional structure by two-dimensional structure, significantly improve the surface area of electrode, improve transference number of ions, the energy density of battery and power density are largely increased; (4) positive pole and negative pole form interdigital structure, can shorten Ion transfer distance, shorten the charging interval of battery, and improve the power density of battery; (5) adopt Graphene or CNT as negative material, significantly can improve the body surface area of negative pole, reduce charge transfer resistance, improve transference number of ions.
Accompanying drawing explanation
Figure 1A-1D is the housing section schematic diagram manufacturing each step of half of battery container in MEMS lithium battery manufacture method of the present invention;
Fig. 2 is the schematic perspective view comprising the battery container of positive pole after MEMS lithium battery of the present invention completes;
Fig. 3 is the schematic perspective view comprising the battery container of negative pole after MEMS lithium battery of the present invention completes;
Fig. 4 is the schematic perspective view that two battery containers are packaged together by MEMS lithium battery of the present invention;
Fig. 5 is the schematic diagram of the porous loose structure on the three-dimensional column array of MEMS lithium battery of the present invention;
Fig. 6 is the top view of the three-dimensional column array (11-positive pole column, 12-negative pole column) of MEMS lithium battery of the present invention;
Fig. 7 is the battery electrode of MEMS lithium battery of the present invention and the Longitudinal cross section schematic of divider wall (13).
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
Fundamental design idea of the present invention is in two substrates, MEMS technology is utilized to process three-dimensional column array and the pond body of regular distribution respectively, column array in these two different base is respectively used to the support as three-dimensional positive pole and negative pole, and then on array column, modify fixing different nano material respectively to form positive pole and negative pole, again both are aimed at sealing, finally injected by noting sample hole by electrolyte, after waiting to fill, sealing is noted sample hole and is namely formed battery.Further preferably, the column array be dislocatedly distributed can form interdigital structure, the cross one another degree of depth of this interdigital structure prepared by technique in form boss height decide and regulate.
More specifically, MEMS lithium battery of the present invention comprises:
First shell, adopts semi-conducting material to make, and it is formed with a cavity and in described cavity, is integrally formed the positive pole of described battery; This semi-conducting material such as can adopt the materials such as silica-based, glass, carbon back, GaAs, wherein preferred silica-base material.
Second housing, adopts and makes with the semi-conducting material of the first shell same material, it is formed with a cavity connected with described first shell and in described cavity, is integrally formed the negative pole of described battery;
Electrolyte, is contained in the cavity between the first shell and second housing.
In the present invention, positive pole such as can select llowing group of materials:
(1) LiCoO
2, LiNiO
2, LiMnO
2, LiFePO
4deng;
(2) trielement composite material: as Li [Ni
1/3co
1/3mn
1/3] O
2, LiNi
1-xmn
xo
2, LiNi
1-xco
xo
2, LiNi
1-x-yco
xmn
yo
2deng, wherein x, y are real number, 0 < x < 1,0 < y < 1.
(3) by LiCoO
2, LiNiO
2, LiMnO
2, LiFePO
4deng by doping, the modified method such as coated, form new positive electrode, as LiFePO
4/ C, LiCoO
2/ C, LiNi
1-xco
xo
2in composite.Wherein, the element of doping such as comprises Mg, Ni, Mn, Zr, Ti, V, Mo, Ga etc.Coated material such as comprises C, CuO, Al
2o
3, ZrO
2, Co
3o
4, Li
4ti
5o
12, LaF
3, AlF
3deng.
Wherein, Li [Ni is preferably adopted
1/3co
1/3mn
1/3] O
2as positive electrode.
In the present invention, negative pole such as can select llowing group of materials:
(1) graphite;
(2) take Graphene as starting material synthesizing new composite, as the compound of metal or metal oxide and Graphene, the material of introducing such as comprises Si, Ge, Sb, Sn, Pt and Fe
3o
4, NiO, Co
3o
4, SnO
2deng.Metal oxide such as comprises SnO, SnO
2, WO
2, MoO
2, VO
2, TiO
2, LixFe
2o
3, Li
4mn
2o
12, Li
4ti
5o
12deng.
Wherein, preferably SnO is adopted
2with the composite of Graphene as negative material.
Positive pole and negative pole can according to the kind of battery and applied field be incompatible chooses electrode material and shape, and the shape of both positive and negative polarity can be such as membranaceous, cylindric, three-dimensional column array etc.As a preferred embodiment, both all adopt three-dimensional column array structure, and using column array as support, fix different nano materials to form positive pole and negative pole respectively in its finishing.
Negative pole and positive electrode surface adopt nanometer-material-modified after be conduction, therefore can be drawn out on the binding post of outside by the metal electrode on its surface or conductive coating, thus be formed the positive pole of battery and negative pole outwards carries power supply.
In the present invention, positive pole and negative pole preferably adopt three-dimensional column array as carrier, in three-dimensional column array, the shape of each column can be cylinder, cone, round platform, bottle shape, positive six prisms, other polyhedron prism, Y-shaped prism etc., preferably adopts cylinder and Y-shaped prism structure.The shape of cross section of each unit column can be circle, Y-shaped, rectangle, square, star or other shape, and for shape of cross section, there is no particular limitation, as long as be conducive to the shape increasing column body surface area.In three-dimensional column array, the finishing of each column has different nano materials, such as when as lithium battery, the nano material that positive pole is modified can be single nano material or composite nano materials, as being Ni/NiO composite Nano foam, Ni/Sn alloy nano-wire, Au/Sn nanometer film etc., the nano material that negative pole is modified can be single nano material or composite nano materials, as being Graphene, CNT etc.; When as Ni-MH battery, positive pole adopts Ni (OH)
2, negative pole adopts carbon black, CoSi, hydrogen bearing alloy etc.
Can arrange in a regular fashion in the cavity of column array between the first housing and the second housing, also can No-L aw Order, as a preferred embodiment, positive pole and negative pole form two matrixes staggered respectively, as the embodiment that is more preferably, positive pole and negative pole column array can form interdigital structure, so-called interdigital structure refers to each column array of anode and the column array dislocation cross arrangement of negative pole, thus can significantly shorten Ion transfer distance, shorten the charging interval of battery, and the power density of battery can be improved.
As a preferred embodiment, three-dimensional column array in the present invention adopts Y-shaped array of prisms as shown in Figure 6, it is except having the advantage of other column array structures, also has following advantage: the netted column array of this " trap " formula, surface area is larger, modify fixing nano material more, can significantly improve migration ion populations, improve power density; The modification of nano material in the structure of this " trap " formula is fixing more stable, is not easy to cause because of vibration anode to intersect with the nano material of negative electrode and mixes.
In the present invention, electrolyte such as adopts non-water system electrolyte, is preferably non-water system organic bath, such as, be the non-water organic bath that solute is dissolved in organic solvent and makes with lithium salts, and preferred electrolyte is further: LiPF
6be dissolved in the electrolyte be mixed with in quaternary solvent that vinyl carbonate, dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate prepare by a certain percentage.In addition, electrolyte can be also colloid form, thus the battery prepared is colloid battery, retention and service life more remarkable.
In a preferred embodiment, as shown in Figure 7, can also arrange divider wall (being equivalent to the barrier film of conventional batteries) between both positive and negative polarity, its effect allows ion pass through, and prevents both positive and negative polarity short circuit.The material of divider wall is consistent with the material of substrate, is prepared by the method for deep etching or chemical attack.
In a preferred embodiment, can also arrange conductive coating on plus plate current-collecting body, this coating is such as aluminium foil coating, effectively to improve the adhesive force of positive plate, reduces the use amount of binding agent, and significantly promotes battery electrical property.
For the sealing between the first shell and second housing, i.e. the sealing of whole battery, can adopt bonded seal, and BCB also can be adopted to seal, or other adhesive sealing.Sealing technology is not limited, as long as can ensure firmness and the sealing of whole battery.
The battery size of above-mentioned preparation is very little, owing to being prepared by MEMS technology, thus can mount in the electronic circuits such as wiring board as surface mount elements, provide power supply to corresponding component.
Because the battery size of above-mentioned preparation is very little, voltage and the capacitance of battery output are all less than normal, therefore can adopt the mode of array, are lined up grid composition battery pack, carry out common outwards power supply, to improve supply voltage and battery capacity.
The invention also discloses a kind of preparation method of chip battery, comprise the following steps:
Take semi-conducting material as substrate, by sputtering or electron beam evaporation layer of Au/Cr, Au thickness is 100 ~ 500nm, preferred 200nm, Cr thickness is 10 ~ 50nm, preferred 20nm, dry film (negative glue) is adopted to carry out photoetching as photoresist, then chemical attack, removes the Au/Cr of other parts, forms extraction electrode;
Upper surface of substrate deposits layer of metal, as Au, Al, preferred aluminium, then on upper surface of substrate, fix one deck dry film carry out photoetching as photoresist, form Minisize pillar array pattern, utilize chemical corrosion method to remove metal outside column array, recycling deep etching process etching forms the pond body of Minisize pillar array and battery first housing;
Fixing nano material is modified as positive pole in Minisize pillar array surface;
Profit uses the same method, and prepares the second housing pond body and extraction electrode thereof of negative pole, and at its Minisize pillar array surface decorated nanometer material as negative pole.
Treat two pond bodies and column array are modified respectively to secure nano material, after defining positive pole and negative pole, the sealing surface of the first housing and the second housing applies one deck to insulate corrosion-resistant glue, as the adhesive of BCB adhesive or other model, then the first housing aimed at the second housing and contact, after adhesive solidifies, namely complete the encapsulation of battery, form the housing of battery.
Inject electrolyte from reserved note sample hole, matter to be electrolysed is full of Chi Tihou, i.e. salable note sample hole, thus obtains MEMS battery.
Wherein, before formation extraction electrode, also can form boss on the surface on this substrate by deep etching or chemical etching technology, thus in etching process procedure thereafter, utilize this boss to form interdigital structure.
In order to improve the body surface area of supporting construction to greatest extent, the invention discloses a kind of in the method for array leg surface by electrochemical corrosion, as shown in Figure 5, three-dimensional column array is formed one deck porosity and looseness shape structure, namely one deck porous silicon layer is formed in column array surface, pore size, porosity and porous silicon layer thickness can be regulated by the condition of electrochemical corrosion (as the ratio of composition each in corrosive liquid, etching time, the factors such as extraneous loading current).After leg surface growth porous silicon layer, its surface area can improve 1-3 the order of magnitude, can significantly improve modifies fixing nano-electrode material, increase transference number of ions, the energy density of raising battery and power density.
More specifically, as a preferred embodiment, the invention discloses a kind of electrode surface at silicon-based substrate and carry out further modifying the method forming loose and porous structure, comprise the following steps:
(1) corrosive liquid is prepared, HF: H
2o
2: ethanol: H
2o=11: 1: 4: 12, wherein the bubble of silicon face is eliminated in the effect of ethanol, make the porosity of porous layer and aperture basically identical; HF and H
2o
2be mainly used in corroding silica-based semi-conducting material of Denging;
(2) making electrode, take silicon chip as substrate, in its surface sputtering layer of metal, as Au, Pt, and preferred Pt;
(3) be placed on vertical face-to-face for the silicon-based substrate of Pt electrode and the porous silicon layer to be prepared substrate of negative pole place (positive pole with) in corrosive liquid, and be connected with external power source;
(4) switch on power, pass to 20 ~ 150mA/cm
2electric current, preferred 80mA/cm
2, corrode 20 ~ 60 minutes, corrosion rate, at 0.8 micron/min, is corroded 20 minutes, can form porous layer at pond body and leg surface.
The thickness of porous silicon can be selected between 1 ~ 50 micron, and in an embodiment of the present invention, the thickness of porous silicon is preferably 15 microns.
Below in conjunction with accompanying drawing and by the present invention is further elaborated the explanation of the specific embodiment of silicon-based substrate.
As shown in Figure 1A, the silicon base 1 for choosing.
As shown in Figure 1B, in order to form interdigital structure, form boss at the upper surface of this silicon base 1 by deep etching or chemical etching technology;
Be 200nm, Cr thickness be 20nm by sputtering or electron beam evaporation layer of Au/Cr, Au thickness, adopt dry film (negative glue) to carry out photoetching as photoresist, then chemical attack, remove the Au/Cr of other parts, form extraction electrode as shown in Figure 1 C;
Boss face deposits layer of metal aluminium, then in boss face, fix one deck dry film carry out photoetching as photoresist, form column array pattern, utilize chemical corrosion method to remove Al outside column array, recycling deep etching process etching forms Minisize pillar array as shown in figure ip and battery pond body (in figure, dotted line represents);
Fixing nano material Ni/NiO composite Nano foam is modified as positive pole, as shown in Figure 2 in this Minisize pillar array surface;
Profit uses the same method, and prepares pond body and the extraction electrode thereof of negative pole, and grapheme modified as negative pole in its Minisize pillar array surface, as shown in Figure 3.
Treat two silica-based on pond body and column array on modify fixing nano material respectively, after forming positive pole and negative pole, two silica-based sealing surfaces apply one deck BCB glue, then the silica-based aligning at the silica-based of positive pole place and negative pole place is contacted, as shown in Figure 4, after BCB gelling is solid, namely completes the encapsulation of battery, forms the housing of battery.
Inject electrolyte from note sample hole, matter to be electrolysed is full of Chi Tihou, i.e. salable note sample hole, thus obtains MEMS lithium battery.
Known through theory calculate, the cell power density>=5mWcm of the theoretical valuation of MEMS lithium battery of the present invention
-2μm
-1, operating temperature can between-50 DEG C ~ 70 DEG C.Through the practical probation of small lot, MEMS lithium battery of the present invention also achieves satisfied technique effect.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a preparation method for MEMS lithium battery, comprises the following steps:
With the substrate that semi-conducting material is the first housing, form the first extraction electrode, the first three-dimensional column array and the first pond body thereon, wherein said first three-dimensional column array is arranged in described first pond body;
Modify in described first three-dimensional column array surface and fix the first nano material as positive pole;
Profit uses the same method, prepare the second housing comprising negative pole, described second housing is formed the second extraction electrode, the second three-dimensional column array and the second pond body, and fix the second nano material as negative pole in described second three-dimensional column array surface modification, wherein said second three-dimensional column array is arranged in described second pond body, and described second pond body is aimed at formation one with described first pond body and held cavity, described first three-dimensional column array and described second three-dimensional column array offset one from another;
Described first housing and the second housing are aimed at and encapsulated, forms the housing of described MEMS lithium battery.
2. the preparation method of MEMS lithium battery as claimed in claim 1, wherein described first housing and the second housing to be aimed at and after the step encapsulated described, also comprise and inject electrolyte from reserved note sample hole, after matter to be electrolysed is full of pond body, sample hole is noted in sealing, thus obtains the step of described MEMS lithium battery.
3. the preparation method of MEMS lithium battery as claimed in claim 1, wherein after the step of the second nano material as negative pole is fixed in described second three-dimensional column array surface modification, described first housing and the second housing are aimed at and before the step encapsulated, is also included in the step of the Chi Tizhong filling colloidal electrolyte on described first housing and the second housing.
4. the preparation method of MEMS lithium battery as claimed in claim 1, wherein on described the first/the second housing, form described the first/the second pond body by deep etching or chemical etching technology and be arranged in the reserved column of described the first/the second pond body, on described reserved column, forming described the first/the second three-dimensional column array by photoetching process.
5. the preparation method of MEMS lithium battery as claimed in claim 1, wherein said semi-conducting material is silica-based, carbon back or GaAs material.
6. the preparation method of MEMS lithium battery as claimed in claim 1, in the step of wherein said formation the first/the second extraction electrode in substrate, comprise and form the step of Au/Cr metal level as mask on the substrate, wherein said Au layer thickness is 100 ~ 500nm, Cr layer thickness is 10 ~ 50nm.
7. the preparation method of MEMS lithium battery as claimed in claim 6, wherein said Au layer thickness is 200nm, Cr layer thickness is 20nm.
8. the preparation method of MEMS lithium battery as claimed in claim 1, the preparation order in no particular order of wherein said the first housing comprising positive pole and the second housing comprising negative pole.
9. the preparation method of MEMS lithium battery as claimed in claim 1, wherein said by the step of the first housing and the second packaging shell, adopt bonded seal or BCB sealing technology.
10. the preparation method of MEMS lithium battery as claimed in claim 1, wherein before described first extraction electrode of formation and/or the second extraction electrode, on the upper surface of substrate of described first housing and/or the second housing, the first boss and/or the second boss is formed by deep etching or chemical etching technology, thus in etching process procedure thereafter, utilize described first boss and the second boss to form interdigital structure.
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| CN110265682A (en) * | 2019-06-06 | 2019-09-20 | 深圳市致远动力科技有限公司 | The preparation method of battery testing intermediate |
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