CN105180643A - Lithium battery drying frame, lithium battery driving device and method for drying lithium batteries - Google Patents

Lithium battery drying frame, lithium battery driving device and method for drying lithium batteries Download PDF

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Publication number
CN105180643A
CN105180643A CN201510606691.4A CN201510606691A CN105180643A CN 105180643 A CN105180643 A CN 105180643A CN 201510606691 A CN201510606691 A CN 201510606691A CN 105180643 A CN105180643 A CN 105180643A
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battery
drying frame
lithium battery
drying
vacuum
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CN105180643B (en
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杨麟
畅志远
张祥
张伟
雷蕾
张凌寒
梁成成
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China Aviation Lithium Battery Co Ltd
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China Aviation Lithium Battery Co Ltd
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Abstract

The invention relates to a lithium battery drying frame, a lithium battery drying device and a method for drying lithium batteries, and belongs to the technical field of lithium ion batteries. The lithium battery drying frame comprises a drying frame body which comprises a drying frame cross beam extending in the front-back direction and battery trays which are fixedly arranged on one side or two sides of the drying frame cross beam and extend in the left-right direction. A vacuumizing pipeline is fixedly arranged on the drying frame cross beam and used for being connected with extraction openings of the batteries in a sealed mode. Limiting mechanisms are fixedly arranged on the battery trays and used for maintaining the sealed connection state of the batteries with the vacuumizing pipeline. By means of the lithium battery drying frame, the drying efficiency of the lithium batteries is improved, and the production cost is lowered.

Description

The method of lithium battery drying frame, lithium battery drying device and dry lithium battery
Technical field
The present invention relates to a kind of method of lithium battery drying frame, lithium battery drying device and dry lithium battery, belong to technical field of lithium ion.
Background technology
In recent years, in the extension process of green energy resource, lithium ion battery is developed rapidly with advantages such as its high-energy-density, high voltage, environmentally safes.Along with the expansion of lithium ion battery applications scope, each application is proposed higher requirement to the cycle life of lithium ion battery and security.In the factors affecting cycle life of lithium ion battery and security, moisture is wherein one of most important influence factor.There is moisture in lithium-ion battery system inside, electrolyte decomposition, Li dendrite and water then can be caused to react consequences such as releasing imflammable gas, directly cause the material structure of lithium-ion battery system to occur worsen and reduce its cycle performance, serious also may cause the serious safety concerns such as blast.
Therefore, the moisture controlling lithium-ion battery system inside is the important goal that lithium ion battery manufacture process controls.In lithium ion battery production process, the battery core in battery, before filling electrolyte, must be carried out heat drying, to reduce battery core internal moisture content, avoid electrolyte and water generation side reaction after fluid injection, affect cycle performance and the security of battery by battery.
Lithium ion battery moisture drying equipment of the prior art is generally a seal case, battery core is entered the battery after shell and puts into seal case, then to heating in casing and vacuum pumping.But, could by moisture removal to requiring content after this mode needs to continue the long period under vacuum conditions at a certain temperature.Reason is, after vacuumizing, box house lacks heat-conduction medium under vacuum conditions, and battery cannot effectively be heated, and internal temperature of battery rises extremely slow, seriously reduces moisture drying efficiency.Particularly for high capacity lithium ion battery, generally, drying time needs more than 50 hours, has had a strong impact on production efficiency, has too increased production cost.
To rise problem slowly for solving in such scheme internal temperature of battery under vacuum state, have in prior art and adopt in dry run by the mode that hot nitrogen displacement and vacuum pumping hocket, utilize the air in nitrogen displacement casing, nitrogen is as heat transfer medium simultaneously, improves the efficiency of heating surface.Publication number is that the Chinese invention patent (publication date is on December 25th, 2014) of CN104567292A discloses a kind of electrokinetic cell vacuum dryer, the fortune wind system comprise furnace chamber, being communicated with furnace chamber, its furnace chamber comprises mica sheet, and its fortune wind system comprises vacuum lead, nitrogen intake stack.Mica sheet is used for heating in furnace chamber, and vacuum lead is used for vacuumizing in furnace chamber, passes into nitrogen by nitrogen intake stack in furnace chamber simultaneously, is taken out of by the moisture in furnace chamber, and ensures there is sufficient heat-conducting gas medium in furnace chamber.The drying efficiency of this mode to battery increases.But under normal circumstances, less with the extraneous mouth communicated in battery case, the moisture of vaporization in battery to be difficult to from battery out, and drying efficiency is still lower, and this mode complex operation, and the amount expending nitrogen comparatively greatly, improves the production cost of battery indirectly.
Summary of the invention
The object of the present invention is to provide the lithium battery drying frame that a kind of drying efficiency is high.The present invention also aims to provide the method using the lithium battery drying device of above-mentioned lithium battery drying frame and use this lithium battery drying device dry lithium battery.
In order to realize above object, the technical scheme of lithium battery drying frame of the present invention is as follows:
A kind of lithium battery drying frame, comprise drying frame body, described drying frame body being fixedly installed the vacuum-pumping pipeline for being tightly connected with the bleeding point of battery, described drying frame body being also fixedly installed for making battery remain on the position-limit mechanism being in the state of being tightly connected with vacuum-pumping pipeline.
Described drying frame body comprises the drying frame crossbeam that extends along the longitudinal direction and is fixedly installed on drying frame crossbeam side or both sides and the battery tray extended in left-right direction, on the end face that one end that described vacuum-pumping pipeline is used for being connected with battery bleeding point is fixedly installed on described drying frame crossbeam or side, described position-limit mechanism is arranged in described battery tray.
Described vacuum-pumping pipeline comprises and vacuumizes main pipeline and plurally vacuumize branch pipe(tube), described in vacuumize on end face or side that branch pipe(tube) one end is fixedly installed on described drying frame crossbeam, the other end is connected with the described main pipeline that vacuumizes.
One end that described vacuum-pumping pipeline is used for being connected with battery bleeding point is connected with evacuation connection, described evacuation connection is tubular structure, the outer tube wall of described evacuation connection is provided with sealing bulge loop, described sealing bulge loop and battery bleeding point inwall or opening's edge are sealed and matched.
The outer tube wall of described evacuation connection is fixedly installed successively the first sealing bulge loop and the second sealing bulge loop along battery bleeding point to the direction of vacuum-pumping pipeline, the external diameter of described first sealing bulge loop equals the internal diameter of battery bleeding point, the external diameter of described second sealing bulge loop is greater than the internal diameter of battery bleeding point, and described second sealing bulge loop is fixedly installed the sealing ring be sealed and matched with battery bleeding point opening's edge on the sidewall of battery bleeding point.
The technical scheme of lithium battery drying device of the present invention is as follows:
A kind of lithium battery drying device, comprise casing, be arranged on heating arrangements in described casing and lithium battery drying frame, described lithium battery drying frame is above-mentioned lithium battery drying frame.
Described heating arrangements comprises and is fixedly installed on heat pipe on described cabinet wall and recycle gas blower structure.
The drying frame body of described lithium battery drying frame coordinates with described cabinet wall guiding movement.
The technical scheme of the method for dry lithium battery of the present invention is as follows:
Use a method for above-mentioned lithium battery drying device dry lithium battery, comprise the steps:
1) vacuum-pumping pipeline on battery bleeding point and described lithium battery drying frame is tightly connected, and by described position-limit mechanism, battery is fixed;
2) described lithium battery drying frame is moved in described casing, vacuum-pumping pipeline is connected with vaccum-pumping equipment, by box sealing;
3) open heating arrangements, after temperature rises to design temperature in casing, open vaccum-pumping equipment and will be evacuated to setting vacuum in battery.
Described design temperature is 70-120 DEG C, and described setting vacuum is not more than-99kPa.Heat time and pumpdown time sum are 8-15h.
Lithium battery is directly connected with vacuum-pumping pipeline by adopting by lithium battery drying frame of the present invention, gas moisture in battery is extracted out, and not by the impact of moisture in air in drying box, ensure that cell peripheral atmospheric pressure state, and have sufficient heat transfer medium, stably can provide heat to battery container, and without nitrogen displaced air as heat transfer medium, also improve the utilization rate of vacuum system, reduce cost.In addition, lithium battery is fixed on drying frame after using lithium battery drying frame of the present invention lithium battery and vacuum lead to be tightly connected, achieve lithium battery to be measured to be connected with the quick of vacuum lead, and form vacuum-pumping pipeline in parallel, achieve quick connection during lithium battery drying, improve drying efficiency, substantially reduce the time of battery drying, lithium battery was shortened to 10 hours by more than original 50 hours drying time.Time particularly for large-scale production, adopt lithium battery drying frame of the present invention to increase substantially production efficiency, shorten the production cycle, there is significant economic benefit.
Further, lithium battery drying frame of the present invention is by arranging evacuation connection, and mechanism coordinates with battery limiting, can ensure that the bleeding point of vacuum-pumping pipeline and battery is accurate, rapid abutting joint, and improve sealing effectiveness, further increase the drying efficiency of lithium battery.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of lithium battery drying device of the present invention;
Fig. 2 is the structural representation of the heat-insulating and sealing casing in Fig. 1;
Fig. 3 is the top view of Fig. 2;
Fig. 4 is the front view of Fig. 2;
Fig. 5 is the structural representation of the battery moisture drying frame in Fig. 1;
Fig. 6 is evacuation connection in Fig. 5 and cell safety valve port annexation schematic diagram;
Fig. 7 is the sectional view of the evacuation connection in Fig. 6;
Fig. 8 is the structural representation of the position-limit mechanism of another embodiment of lithium battery drying device of the present invention.
Detailed description of the invention
The embodiment of lithium battery drying device of the present invention:
As shown in figs. 1-7, lithium battery drying device of the present invention comprises heat-insulating and sealing casing 10, heating arrangements and lithium battery drying frame 60 is provided with in casing, lithium battery drying frame comprises drying frame body, drying frame body being fixedly installed the vacuum-pumping pipeline for being tightly connected with the bleeding point of battery, drying frame body being also fixedly installed for making battery remain on the position-limit mechanism being in the state of being tightly connected with vacuum-pumping pipeline.
Drying frame body comprises drying layer frame, drying layer frame comprises the drying frame crossbeam 70 and battery tray 80 that are fixed together, in the present embodiment, drying frame crossbeam is the rectangular box body extended along the longitudinal direction, the both sides of rectangular box body lower end are welded to connect the battery tray with platy structure, and battery tray is horizontally disposed with, and extend in left-right direction, in other embodiments, battery tray only can be arranged on the side of drying frame crossbeam.
Vacuum-pumping pipeline comprises evacuation connection 90, vacuumizes branch pipe(tube) 100, vacuumizes main pipeline 110, vacuumizing branch pipe(tube) is that hard material is made, as metal or rigid plastics, vacuumizing branch pipe(tube) string is located on drying frame beam side wall, and be fixed on drying frame beam side wall by nut, make the two ends vacuumizing branch pipe(tube) be in the inside and outside of the rectangular box body of drying frame crossbeam respectively.Two sidewalls of drying frame crossbeam are fixedly installed along the longitudinal direction successively and multiplely vacuumize branch pipe(tube), aforesaid way is all adopted to arrange, each vacuumizes one end that branch pipe(tube) is in the cuboid box external body of drying frame crossbeam and is sealedly connected with evacuation connection, the other end with vacuumize main pipeline and be tightly connected, the gas vacuumized in branch pipe(tube) is imported and vacuumizes in main pipeline.Vacuumizing main pipeline is metal bellows or plastic tube, and vacuumizes branch pipe(tube) junction and arrange metal or rigid plastics air exhaust nozzle, vacuumizes rubber outside branch pipe(tube) and air exhaust nozzle or plastic flexible pipe realizes being tightly connected by being set in.Vacuumize the sealing of main pipeline one end, the other end to stretch out and the end face being fixed on drying frame crossbeam is formed and vacuumizes the end 111 of bleeding of main pipeline from the end face of rectangular box body one end of drying frame crossbeam.
Drying frame body can comprise one deck drying layer frame, and also can comprise two-layer above drying layer frame, the present embodiment comprises three layers of drying layer frame, between the drying frame crossbeam of every one deck or be welded to connect between battery tray.The end of bleeding vacuumizing main pipeline be in the drying frame crossbeam of lower floor is tightly connected with the main pipeline that vacuumizes be in the drying frame crossbeam on upper strata, what make the gas vacuumized in main pipeline of lower floor enter upper strata vacuumizes in main pipeline, and the end of bleeding vacuumizing main pipeline of the superiors is connected with the exhaust tube of vaccum-pumping equipment 20.
Evacuation connection is tubular structure, the outer tube wall that evacuation connection is in one end of drying frame crossbeam outside is fixedly installed successively the first sealing bulge loop 901 and the second sealing bulge loop 902 along battery bleeding point to the direction of vacuum-pumping pipeline, the external diameter of the first sealing bulge loop equals the internal diameter of battery bleeding point, after making evacuation connection insert battery bleeding point, the first bulge loop can make relative movement not to occur between battery bleeding point and evacuation connection.The external diameter of the second sealing bulge loop is greater than the external diameter of battery bleeding point opening's edge, and the second sealing bulge loop is bonded with the elastic seal ring 903 be sealed and matched with battery bleeding point opening's edge on the sidewall of battery bleeding point.Evacuation connection with vacuumize one end that branch pipe(tube) is connected by DN clip 904 with vacuumize branch pipe(tube) and realize being tightly connected, also can realize in the following way being tightly connected: evacuation connection adopts metal or rigid plastics, with vacuumize the end that one end that branch pipe(tube) is connected is set in evacuation connection respectively by rubber or plastic flexible pipe and vacuumizes branch pipe(tube) and realize being tightly connected, also one end of evacuation connection can be inserted vacuumizes in the corresponding end of branch pipe(tube), and evacuation connection outer wall and vacuumize and between branch pipe(tube) inwall, sealing ring is set realizes being tightly connected.
Position corresponding with each evacuation connection in battery tray is provided with for carrying out spacing groove to battery, and described groove constitutes described position-limit mechanism.Battery in the present embodiment is rectangular cell, and bleeding point is the relief valve port of rectangular cell.Width and the length of the width of the groove in battery tray and length and rectangular cell side are consistent, battery side is inserted in groove realize spacing, distance between groove and evacuation connection is set simultaneously, ensure relief valve port opening's edge can push up be pressed in the second sealing bulge loop sidewall elastic seal ring on, realize being tightly connected between evacuation connection and relief valve port.
Heating arrangements comprises the heat pipe 30 be evenly laid on heat-insulating and sealing cabinet wall and the recycle gas blower structure 40 being arranged on casing rear wall, and heat pipe is heat pipe of the prior art, as arranged heating wire in stainless steel tube.The fan that recycle gas blower structure comprises blower motor and is connected with blower motor, blower motor drives fan to rotate to be blast heating in casing, ensure the uniformity of box interior temperature, be connected by magnet fluid sealing mode between blower motor with fan, the transmission of motor torque can be guaranteed, and do not affect the vacuum leakproofness of casing.Heat-insulating and sealing cabinet wall is also equipped with alumina silicate fibre material, to improve effect of heat insulation.Heat-insulating and sealing casing top arranges porose, and the exhaust tube 50 for vaccum-pumping equipment passes through, and is sealed and matched between the exhaust tube of vaccum-pumping equipment and heat-insulating and sealing casing top.
The bottom of heat-insulating and sealing casing is provided with gathering sill, and the lower end of drying frame body is provided with directive wheel 601, and between directive wheel with gathering sill, guiding movement coordinates, and moves at lithium battery drying frame or when shifting out heat-insulating and sealing casing, can push easily or pull out.
In other embodiments of lithium battery drying device of the present invention, evacuation connection is located on drying frame beam side wall perpendicular to the side string of drying frame crossbeam, and be fixed on drying frame beam side wall by nut, make the two ends of evacuation connection be in the inside and outside of the rectangular box body of drying frame crossbeam respectively, the one end being in the rectangular box body inside of drying frame crossbeam is sealedly connected with and vacuumizes branch pipe(tube).Evacuation connection is metal or rigid plastics, and vacuumizing branch pipe(tube) is metal bellow or plastic tube.Two sidewalls of drying frame crossbeam are fixedly installed multiple evacuation connection along the longitudinal direction successively, all adopt aforesaid way to arrange.
In other embodiments of lithium battery drying device of the present invention, the drying frame body of lithium battery drying frame coordinates with wall box guiding movement, realizes guiding movement coordinate by the guide rail be arranged on the battery tray side of drying frame body and heat-insulating and sealing wall box.
In other embodiments of lithium battery drying device of the present invention, groove in battery tray is provided with away from one end of drying frame crossbeam the spring extended towards drying frame crossbeam direction, spring one end is fixed on the sidewall of groove, and the other end can produce towards the elastic force in drying frame crossbeam direction the battery be placed on wherein.After battery is put into groove, the elastic force of spring can make the better tightness of cell safety valve port and evacuation connection, meanwhile, also can make the length of groove and width unrestricted, be applicable to the battery of various sizes.
In other embodiments of lithium battery drying device of the present invention, as shown in Figure 8, position-limit mechanism also can, by being fixedly installed battery clamp in battery tray, realize fastening adding of battery by the transportable side plate that steps up.Battery clamp comprises fixed side 801, fixed base plate 802, clamping side plate 803 and thrust mechanism 804, first by being placed on fixed side and fixed base plate when battery is placed in fixture, described clamping side plate clamps battery is unified by thrust mechanism action simultaneously, ensure the uniformity of clamping, described thrust mechanism relies on the translating rotation that is threaded to be the rectilinear movement clamping side plate.
In other embodiments of lithium battery drying device of the present invention, the sealing bulge loop of evacuation connection only has one, the external diameter of sealing bulge loop is equal to or slightly less than the internal diameter of relief valve port, on the outer peripheral face of sealing bulge loop, bonding is provided with one deck elastomeric material, insert the relief valve port of battery at evacuation connection after, the elastomeric material on sealing bulge loop can play sealing function.
In other embodiments of lithium battery drying device of the present invention, evacuation connection and DN clip can not be set, vacuumize branch pipe(tube) directly and cell safety valve port be tightly connected.Also can arrange and vacuumize branch pipe(tube) is rubber or plastic flexible pipe, and after the evacuation connection that flexible pipe one end connects is connected with cell safety valve port, battery can adopt relief valve port mode to be upward fixed in the groove in battery tray.
In above-described embodiment, heat pipe and recycle gas blower structure realize heating as heat transfer medium to battery by the air in heat-insulating and sealing casing, in other embodiments, drying frame body can be set and be metal material, and by drying frame body and heat pipe contact, the contact realizing drying frame body and battery is conducted heat.
The structure of the lithium battery drying frame in the embodiment of lithium battery drying frame of the present invention and above-described embodiment is completely the same, repeats no more herein.In addition, the various alternative form of the lithium battery drying frame in above-described embodiment, is also all applicable to the embodiment of lithium battery drying frame of the present invention.
The embodiment of the method for use of the present invention above-mentioned lithium battery drying device dry lithium battery comprises the steps:
1) evacuation connection is first connected with the relief valve port of lithium battery, the first sealing bulge loop by evacuation connection inserts in cell safety valve port, and make the opening's edge top press-fit of elastic seal ring on the second sealing bulge loop and relief valve port, ensure to be sealed and matched therebetween, then by evacuation connection with vacuumize branch pipe(tube) and be tightly connected, then one end, side of lithium ion battery is inserted in the groove in battery tray fixing;
2) after the lithium battery of each layer has been connected with lithium battery drying frame, lithium battery drying frame is closely entered in heat-insulating and sealing casing by the gathering sill guiding movement of directive wheel and heat-insulating and sealing bottom half, the exhaust tube that main pipeline and string be located at the vaccum-pumping equipment at heat-insulating and sealing casing top that vacuumizes of the superiors on drying frame body is tightly connected, then close heat-insulating and sealing casing to be sealed, the vaccum-pumping equipment in the present embodiment is vavuum pump;
3) open vavuum pump and start forvacuum, when vacuum reaches-90kPa, close vavuum pump, dry gas is utilized to carry out the black vacuum state of pressure release to-10kPa, to remove the original gas moisture of internal system, then open the power supply of heating arrangements, make to be arranged on heat pipe on heat-insulating and sealing cabinet wall and recycle gas blower structure is started working, after temperature rises to design temperature in casing, open vavuum pump and be evacuated to-99.5kPa by battery; Described design temperature is 70-120 DEG C, to be heated to the total drying time vacuumized be 8-15h, in the present embodiment, design temperature is 105 DEG C, and total drying time is 12h.
After testing, the pole piece moisture in dried lithium battery is 460ppm.
In other embodiments of the method for use lithium battery drying device dry lithium battery of the present invention, step 3) in directly open heating arrangements heating, no longer carry out forvacuum.

Claims (10)

1. a lithium battery drying frame, it is characterized in that, comprise drying frame body, described drying frame body comprises the drying frame crossbeam that extends along the longitudinal direction and is fixedly installed on drying frame crossbeam side or both sides and the battery tray extended in left-right direction, described drying frame crossbeam being fixedly installed the vacuum-pumping pipeline for being tightly connected with the bleeding point of battery, described battery tray being fixedly installed for making battery remain on the position-limit mechanism being in the state of being tightly connected with vacuum-pumping pipeline.
2. lithium battery drying frame as claimed in claim 1, is characterized in that, on the end face that one end that described vacuum-pumping pipeline is used for being connected with battery bleeding point is fixedly installed on described drying frame crossbeam or side.
3. lithium battery drying frame as claimed in claim 2, it is characterized in that, described vacuum-pumping pipeline comprises and vacuumizes main pipeline and plurally vacuumize branch pipe(tube), describedly vacuumize on end face or side that branch pipe(tube) one end is fixedly installed on described drying frame crossbeam, the other end is connected with the described main pipeline that vacuumizes.
4. lithium battery drying frame as claimed in claim 3, it is characterized in that, described vacuum-pumping pipeline comprises the evacuation connection being used for being connected with battery bleeding point being connected to and vacuumizing branch pipe(tube) one end, described evacuation connection is tubular structure, the outer tube wall of described evacuation connection is provided with sealing bulge loop, described sealing bulge loop and battery bleeding point inwall or opening's edge are sealed and matched.
5. lithium battery drying frame as claimed in claim 4, it is characterized in that, the outer tube wall of described evacuation connection is fixedly installed successively the first sealing bulge loop and the second sealing bulge loop along battery bleeding point to the direction of vacuum-pumping pipeline, the external diameter of described first sealing bulge loop equals the internal diameter of battery bleeding point, the external diameter of described second sealing bulge loop is greater than the internal diameter of battery bleeding point, and described second sealing bulge loop is fixedly installed the sealing ring be sealed and matched with battery bleeding point opening's edge on the sidewall of battery bleeding point.
6. a lithium battery drying device, comprise casing, be arranged on heating arrangements in described casing and lithium battery drying frame, it is characterized in that, described lithium battery drying frame is the lithium battery drying frame as described in claim 1-4 any one.
7. lithium battery drying device as claimed in claim 6, is characterized in that, described heating arrangements comprises and is fixedly installed on heat pipe on described cabinet wall and recycle gas blower structure.
8. lithium battery drying device as claimed in claim 6, it is characterized in that, the drying frame body of described lithium battery drying frame coordinates with described cabinet wall guiding movement.
9. use a method for lithium battery drying device dry lithium battery as claimed in claim 6, it is characterized in that, comprise the steps:
1) vacuum-pumping pipeline on battery bleeding point and described lithium battery drying frame is tightly connected, and by described position-limit mechanism, battery is fixed;
2) described lithium battery drying frame is moved in described casing, vacuum-pumping pipeline is connected with vaccum-pumping equipment, by box sealing;
3) open heating arrangements, after temperature rises to design temperature in casing, open vaccum-pumping equipment and will be evacuated to setting vacuum in battery.
10. the method for dry lithium battery as claimed in claim 9, it is characterized in that, described design temperature is 70-120 DEG C, and described setting vacuum is not more than-99kPa.
CN201510606691.4A 2015-09-22 2015-09-22 Lithium battery drying frame, lithium battery drying device and the method for drying lithium battery Active CN105180643B (en)

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CN109631510A (en) * 2018-11-26 2019-04-16 合肥国轩高科动力能源有限公司 Contact baking equipment of lithium cell
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CN105823325A (en) * 2016-03-29 2016-08-03 华中科技大学 Compartment-type material platform for baking in vacuum tunnel kiln
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CN109631510A (en) * 2018-11-26 2019-04-16 合肥国轩高科动力能源有限公司 Contact baking equipment of lithium cell
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CN114459216A (en) * 2021-11-29 2022-05-10 湖南嘉园新能源科技有限公司 Polar plate drying equipment for manufacturing lithium battery

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