CN103934285B - Battery pole piece pressure rolling method and multistage roller mill thereof - Google Patents
Battery pole piece pressure rolling method and multistage roller mill thereof Download PDFInfo
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- CN103934285B CN103934285B CN201410187567.4A CN201410187567A CN103934285B CN 103934285 B CN103934285 B CN 103934285B CN 201410187567 A CN201410187567 A CN 201410187567A CN 103934285 B CN103934285 B CN 103934285B
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- 238000005096 rolling process Methods 0.000 title claims description 80
- 238000000034 method Methods 0.000 title claims description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 35
- 239000011149 active material Substances 0.000 claims description 27
- 230000009123 feedback regulation Effects 0.000 claims description 17
- 239000008187 granular material Substances 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 13
- 230000035945 sensitivity Effects 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000003384 imaging method Methods 0.000 claims description 6
- 230000000052 comparative effect Effects 0.000 claims description 4
- 230000036961 partial effect Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 description 23
- 238000007906 compression Methods 0.000 description 23
- 239000013543 active substance Substances 0.000 description 11
- 239000011247 coating layer Substances 0.000 description 11
- 239000010410 layer Substances 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000003801 milling Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000005056 compaction Methods 0.000 description 4
- 238000007766 curtain coating Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 230000005662 electromechanics Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000007591 painting process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000004393 prognosis Methods 0.000 description 1
- 238000004826 seaming Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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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- Battery Electrode And Active Subsutance (AREA)
Abstract
The multistage roller mill of a kind of battery pole piece, comprise surely thick device, fixed thick device comprises the first roll and the second roll, a Ge Tiaofeng mechanism is respectively provided with between the first roll and the bearing block at the second roll two ends, hydraulic means acts on the two ends of the first roll or the second roll, keep the roll gap substantially constant between two rolls, also comprise at least one prepressing device, each prepressing device comprises the first pony press, second pony press, and a pair pony press elastic hydraulic device, precompressed roll gap is formed between first pony press and the second pony press, pony press elastic hydraulic device acts on the two ends of the first pony press or the second pony press respectively, keep the pressure almost constant of the first pony press or the second pony press.The present invention has widely applicable, no matter one side, two-sided or common pole piece, and all can use when not doing any structural adjustment, the versatility of the roller mill that improve is good.
Description
Technical field
The present invention relates to a kind of to battery pole piece, especially the battery pole piece pressure rolling method of electrodes of lithium-ion batteries and multistage roller mill thereof.
Background technology
Lithium ion battery is made up of lithium-ion electric core, electrolyte, protection circuit (PCM) and housing parts.Battery core is then made up of positive pole, negative pole and barrier film.The part of positive pole is positive electrode (as LiFePO4)+conductive agent+adhesive (PVDF)+collector (aluminium foil), and the part of negative pole is graphite+conductive agent+thickener (CMC)+binding agent (SBR)+collector (Copper Foil).Positive pole and negative pole are commonly referred to as battery pole piece in the industry cycle, and in order to the uniformity of the density and thickness that improve battery pole piece surfacing, positive/negative plate must carry out roll extrusion after painting process, and this operation is called the rolling of battery pole piece.
The process of battery pole piece rolling is that battery pole piece draws between the roll of rotation by the frictional force produced between roll and battery pole piece, the process of battery pole piece compressive deformation.The rolling of battery pole piece is different from the rolling of bloom, and the process of steel rolling is that an iron molecule extends longitudinally the process with transverse spreading, and its density does not change in the operation of rolling; And the rolling of battery pole piece is the process of battery material compaction on a positive/negative plate, its object is to the compacted density increasing negative or positive electrode material, suitable compacted density can increase the discharge capacity of battery, reduce internal resistance, reduce polarization loss, extend the cycle life of battery, improve the utilization rate of lithium ion battery.Through overtesting, suitable positive electrode compacted density between 2.8g/cm3-3.4g/cm3, negative pole be about 1.5g/cm3.Compacted density excessive or too small, is all unfavorable for embedding or the deintercalation of lithium ion.Therefore, when battery pole piece implements roll extrusion, roll-force is unsuitable excessive also unsuitable too small, should meet the feature of battery pole piece material.
Existing battery pole piece roller mill, the most frequently used two-roller mill, it comprises top roll and lower roll, respectively be provided with for regulating a pair voussoir (gap adjusting device) rolling seam between described topping roll and the two end axles bearing of bottom roll, the hydraulic means upwards pushed up by bottom roll is provided with in the bottom, two ends of bottom roll, described hydraulic means ensures to roll the stable of seam, is referred to as surely to roll seam rolling in industry; Be exactly the three-high mill being seen in patent document in addition, alternative expression battery pole piece rolling mill disclosed in Chinese patent literature CN202411090U, comprises topping roll and bottom roll, between topping roll and bottom roll, is provided with central roll again; Below bottom roll, be provided with downforce device, downforce device adopts hydraulic transmission mode; Pressure apparatus on being provided with on topping roll, upper pressure apparatus adopts screw drive mode; Gap adjusting device on being provided with between topping roll and central roll, is provided with lower gap adjusting device between bottom roll and central roll.After alternative expression milling train completes the first passes between central roll is with bottom roll, in beeline, battery pole piece is sent into central roll with completing the second passes between topping roll, its essence of this three-high mill is also surely roll seam rolling.Be seen in the four-high mill of patent document in addition, four roller tandem rolling electrothermal battery pole piece rolling mills disclosed in Chinese patent literature CN, the rolling device comprising frame, be arranged on the motor in frame and be connected with motor-driven, described rolling device comprises two groups of pair rollers that horizontal alignment is arranged, and often organizes pair roller and comprises about two Electromechanic heating rollers be set up in parallel; This Electromechanic heating roller comprises the roller of hollow, the plug being arranged on roller inside and the solenoid of uniform winding on plug; Described roller is arranged in frame by bearing I; Described plug is fixedly installed in frame, and end, plug one end is extended roller cavity and is fixedly connected with frame, is flexibly connected between plug with roller by bearing II.This four-high mill is also surely roll seam rolling.
Existing surely roll seam milling train it utilize substantially invariable roll seam come rolling battery pole piece, there is the problem of following several aspect in it, one is when the coating layer of active substance area on substrate two sides does not wait, surely roll seam suppress kind in, substantially not being compacted of the redundance that area is large, affect the capacity of battery, as shown in Figure 1, the first coating layer of active substance 200 and the second coating layer of active substance 300 is established respectively on the two sides of substrate 100, wherein the length of the second coating layer of active substance 300 is than the long H of the first coating layer of active substance 200, suppose that substrate thickness is 10 μ, the first initial coating layer of active substance and the thickness of the second coating layer of active substance are respectively 120 μ, compression ratio is 70%, so be should be 240 μ X70%+10 μ=178 μ by the battery pole piece thickness after compressing, in order to prevent battery pole piece by the bounce-back after compressing, generally will roll being less than of seaming by the battery pole piece thickness after compressing, namely 178 μ are less than, be generally 170-175 μ, when set roll seam as 170-175 μ time, obviously, ratio first coating layer of active substance 200 of the second coating layer of active substance 300 in this example grow part, i.e. part corresponding to H, its thickness only has 120 μ, by 170-175 μ roll seam time, do not compressed, this certainly will have influence on the capacity of last battery, two is that double-roll rolling mill single deflection is excessive, can cause that coating layer of active substance kills, curtain coating or expand to surrounding, be unfavorable for the compacting of coating layer of active substance, although, existing three rollers or four-high mill adopt two to roll seam successively pressure rolling, roll seam, but its rolling battery pole piece out neither very good (namely H corresponding part is not compressed), three is this fixed roller type milling trains, its active force be the two ends acting on bottom roll voussoir on, its effective pressure is far smaller than active force, causes the waste of hydraulic coupling.
Chinese patent literature CN203155697U discloses a kind of single double-side cell pole piece milling train, it is arranged between up-down rollers bearing block by four cover dished spring assemblies, and during pole piece rolling, wedge is thrown off, on oil cylinder, pressure pressure offsets the precompression of disc spring, and up-down rollers is in quick condition.The two-sided pole piece of rolling list one side and two-sided time keep constant pressure, thus ensure that the compression ratio that one side is identical with double-side material.When the common pole piece of rolling, adjustment wedge makes wedge play the effect adjusting and roll seam, also can the common pole piece of rolling.This milling train, at the common pole piece of rolling with between other one sides and two-sided pole piece, needs to exchange between wedge and disc spring just can use, and makes the use between different pole piece thickness become loaded down with trivial details, uses and is subject to a definite limitation; In addition, disc spring is located between up-down rollers bearing block, cannot accomplish to control the elastic force of disc spring, along with the increase of disc spring compression number of times, the creep of disc spring causes coefficient of elasticity to change, and cause the pressure change acted on pole piece, and pressure change is uncontrollable, therefore, its compression ratio is just difficult to control accurately.
Summary of the invention
In order to overcome the problems referred to above, the invention provides a kind of versatility good, no matter one side, two-sided or common pole piece all can use, and the compression ratio of the battery pole piece battery pole piece pressure rolling method that can precisely control and multistage roller mill thereof.
Technical scheme of the present invention is: provide a kind of battery pole piece pressure rolling method, comprise the steps,
(1), the compacting step of battery pole piece, this step is at least realized by a prepressing device, the spacing of rolling seam of described prepressing device is flexible in the process of rolling pole piece, described in roll seam be realize by acting on the elastic hydraulic pneumatic shuttle formed on this roller rolling in two rollers of seam;
(2), the fixed thick step of battery pole piece, this step is realized by surely thick device, the spacing of rolling seam of described fixed thick device is changeless in the process of rolling pole piece, and the spacing of rolling seam of described fixed thick device is less than or equal to the design thickness of the pole piece after being rolled;
(3), battery pole piece first after compacting, then enters the thickness correction that surely thick step carries out battery pole piece.
As improvement of the present invention, described elastic hydraulic pneumatic shuttle comprises the gentle splenium of hydraulic part and divides, and described hydraulic part acts on the air of air pressure part, by hydraulic compression air, and pressure being passed to piston and the push rod of air part, push rod remakes for roll.
As improvement of the present invention, also comprising pressure detecting closed-loop adjustment step, by detecting the size of rolling the pressure of seam of described prepressing device, coming the hydraulic pressure of elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure.
As improvement of the present invention, also comprising Thickness sensitivity closed-loop adjustment step, by detecting the thickness of the battery pole piece after described prepressing device or fixed thick device, coming the hydraulic pressure of elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure.
As improvement of the present invention, the granule integrity also comprising active material layer detects closed-loop adjustment step, by detecting the granule integrity of the active material layer of the battery pole piece after described prepressing device or fixed thick device, come the hydraulic pressure of elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure.
The present invention also provides a kind of battery pole piece multistage roller mill, comprise surely thick device, described fixed thick device comprises the first roll and the second roll, a Ge Tiaofeng mechanism is respectively provided with between described first roll and the bearing block at the second roll two ends, hydraulic means acts on the two ends of described first roll or the second roll, keep rolling seam substantially constant between two rolls, also comprise at least one prepressing device, each described prepressing device comprises pony press and a pair pony press elastic hydraulic pneumatic shuttle, form pre-pressure rolling between described pony press and described first roll or the second roll to stitch, described pony press elastic hydraulic pneumatic shuttle acts on the two ends of described pony press respectively, keep the pressure almost constant of described pony press, reach Digital Control precision.
The present invention also provides a kind of battery pole piece multistage roller mill, comprise surely thick device, described fixed thick device comprises the first roll and the second roll, a Ge Tiaofeng mechanism is respectively provided with between described first roll and the bearing block at the second roll two ends, hydraulic means acts on the two ends of described first roll or the second roll, keep rolling seam substantially constant between two rolls, also comprise at least one prepressing device, each described prepressing device comprises the first pony press, second pony press, and a pair pony press elastic hydraulic pneumatic shuttle, form pre-pressure rolling between described first pony press and described second pony press to stitch, described pony press elastic hydraulic pneumatic shuttle acts on the two ends of described first pony press or the second pony press respectively, keep the pressure almost constant of described first pony press or the second pony press.
As improvement of the present invention, described pony press elastic hydraulic pneumatic shuttle comprises cylinder body, and in described cylinder body, be provided with first piston and the second piston, push rod is connected with first piston, and stretches out in one end of described cylinder body, acts on the two ends of described first pony press; Be air zone between described first piston and the second piston, described second piston forms hydraulic region away from the one side of air zone with described cylinder body, and described hydraulic region is connected with Hydraulic Station by hydraulic inlet.
As improvement of the present invention, also comprise pressure detecting closed-loop adjustment device, described pressure detecting closed-loop adjustment device comprises pressure transducer and control circuit, described pressure transducer is by detecting the pressure of the pre-pressure rolling seam of described prepressing device, and by flowing to control circuit after analog-to-digital conversion, described control circuit regulates the described hydraulic pressure of pony press elastic hydraulic pneumatic shuttle or the size of air pressure according to the change of pressure.
As improvement of the present invention, also comprise Thickness sensitivity closed-loop adjustment device, described Thickness sensitivity closed-loop adjustment device comprises pole piece thickness measure mechanism, control circuit and mechanical actuating mechanism, described pole piece thickness measure mechanism is by detecting the thickness of the battery pole piece after described prepressing device or fixed thick device, and by flowing to control circuit after analog-to-digital conversion, described control circuit, according to the change of pole piece thickness, carrys out the hydraulic pressure of pony press elastic hydraulic pneumatic shuttle described in feedback regulation by described mechanical actuating mechanism or the size of air pressure rolls seam.
As improvement of the present invention, the granule integrity also comprising active material layer detects closed-loop adjustment device, described granule integrity detects closed-loop adjustment device and comprises digital camera head or ray class checkout gear and control circuit and executing agency, the image on the active material layer surface of described digital camera head or the battery pole piece of ray class checkout gear shooting after described prepressing device or fixed thick device, flow to control circuit, control circuit compares taking the image obtained with pre-standard picture in control circuit, and come the hydraulic pressure of pony press elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure according to comparative result.
The present invention is owing to have employed the prepressing device of one or more employing constant pressure, no matter one side, two-sided or common pole piece, and two-sided on the thickness of active material equal or unequally all can to use when not doing any structural adjustment, as long as pressure is output into pressure by oil cylinder or cylinder be transferred to the safe pressure being less than battery pole piece active material particle and destroying, just can ensure that active material is not destroyed, meanwhile, the versatility of the roller mill also improved and efficiency; In addition, adopt the granule integrity of pressure detecting, Thickness sensitivity and/or active material layer to detect, closed-loop adjustment can improve the quality conformance of battery pole piece, thus finally can improve the overall performance of battery core.
Accompanying drawing explanation
Fig. 1 is the battery pole piece cross-sectional view of existing double spread.
Fig. 2 is the planar structure schematic diagram of an embodiment of the present invention.
Fig. 3 be embodiment illustrated in fig. 2 in the side structure schematic diagram of three-high mill.
Fig. 4 be embodiment illustrated in fig. 2 in the plan structure schematic diagram of three-high mill.
Fig. 5 is the planar structure schematic diagram of the second embodiment of the present invention.
Fig. 6 is the structural representation of the pony press elastic hydraulic pneumatic shuttle in the present invention.
Detailed description of the invention
The invention provides a kind of battery pole piece pressure rolling method, comprise the steps,
(1), the compacting step of battery pole piece, this step is at least realized by a prepressing device, the spacing of rolling seam of described prepressing device is flexible in the process of rolling pole piece, described in roll seam pressure be realize by acting on the elastic hydraulic pneumatic shuttle formed on this roller rolling in two rollers of seam; (precompressed of battery pole piece herein adopts to put the pony press realization of control by elastic hydraulic, the prepressing device of one or more levels pressure almost constant can be adopted at pre-pressing stage, the 80%-95% of the compression ratio of battery pole piece is realized at pre-pressing stage, as supposed, the compression ratio of battery pole piece is designed to 30%-35%, the compression ratio of so-called battery pole piece refers to that the original depth of battery pole piece deducts by the value of the thickness gained of the battery pole piece after compressing, with the percentage of the original depth of battery pole piece; The 80%-95% of compression ratio 30%-35% to be reduce at pre-pressing stage, the 5%-20% of compression ratio 30%-35% is only stayed to enter surely thick phase process, like this, no matter just can realize battery pole piece is single or double, no matter two-sided is uniform thickness homalographic, and still uniform thickness area is not unequal yet, can reach identical compression ratio at pre-compaction process, play the effect of the active material compacting to battery pole piece, the battery pole piece for next step is fixed thick gets ready.When prepressing device is multistage, the compression ratio of every grade can be designed in advance, the compression ratio of every grade can be identical, also can be different, as long as ensure that the compression energy of the prepressing device before fixed thick step reaches designing requirement, if overall compression ratio is 30%, the precommpression of pre-pressing stage is than being 90% of overall compression ratio, have three grades of precommpression, every grade of precommpression is than equal, then every grade of precommpression is than being 30%.
(2), the fixed thick step of battery pole piece, this step is realized by surely thick device, the spacing of rolling seam of described fixed thick device is changeless in the process of rolling pole piece, and the spacing of rolling seam of described fixed thick device is less than or equal to the design thickness of the pole piece after being rolled; Electrode plates fixed thick be adopt determining deviation roll seam, to the further compression of the compression ratio stayed at pre-pressing stage, battery pole piece is made to reach design thickness, due to the final thickness rolling seam relatively battery pole piece in the surely thick stage, so also would not because of conventional compression time, cause the problems such as the active material curtain coating distortion on battery pole piece because single compression compression ratio is too large.Fixed thick step is only that the battery pole piece slightly larger than battery pole piece final thickness is compressed to final thickness.
(3), battery pole piece first after compacting, then enters the thickness correction that surely thick step carries out battery pole piece.
In the present invention, described elastic hydraulic pneumatic shuttle comprises the gentle splenium of hydraulic part and divides, and described hydraulic part acts on the air of air pressure part or air pressure partial action in hydraulic part, and pressure is passed to piston and push rod, push rod remakes for roll.Because the compressed-air actuated volume of air part has certain telescopicing performance, elastic reaction can be played like this, keep the pressure almost constant of pony press, the compaction well to the active material of battery pole piece can be played, and don't cause the curtain coating of active material.
In order to ensure the quality of product, the present invention also can comprise pressure detecting closed-loop adjustment step, by detecting the size of the pressure of the pre-pressure rolling seam of described prepressing device, comes the hydraulic pressure of elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure.Specific implementation mechanism refers to following content.
In order to ensure the quality of product, the present invention also can comprise Thickness sensitivity closed-loop adjustment step, by detecting the thickness of the battery pole piece after described prepressing device or fixed thick device, comes the hydraulic pressure of elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure.Specific implementation mechanism refers to following content.
In order to ensure the quality of product, the granule integrity that the present invention also can comprise active material layer detects closed-loop adjustment step, by detecting the granule integrity of the active material layer of the battery pole piece after described prepressing device or fixed thick device, come the hydraulic pressure of elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure.Specific implementation mechanism refers to following content.
Refer to Fig. 2, what Fig. 2 disclosed is the multistage roller mill of a kind of battery pole piece, comprise surely thick device 1, described fixed thick device 1 comprises the first roll 11 and the second roll 12, between described first roll 11 and the bearing block at the second roll 12 two ends, be respectively provided with a Ge Tiaofeng mechanism (do not draw, existing conventional Tiao Feng mechanism is a pair voussoir, by regulating the relative position between two voussoirs, reach the object regulating and roll seam size, Tiao Feng mechanism is prior art, here repeat no more), hydraulic means 30 acts on described first roll 11 or/and the two ends of the second roll 12, rolling between two rolls is kept to stitch h1 substantially constant, in the present embodiment, the present invention also comprises N number of prepressing device 2 ... N-1, N, each described prepressing device 2 comprises pony press 21 and a pair pony press elastic hydraulic pneumatic shuttle 22, form pre-pressure rolling between described pony press 21 and described first roll 11 or the second roll 12 and stitch 23, described pony press elastic hydraulic pneumatic shuttle 22 acts on the two ends of described pony press 21 respectively, keep the pressure almost constant of described pony press 21.Battery pole piece 26 is first by prepressing device 2 ... N-1, N, multistage prognosis, the seam h1 that rolls finally entering surely thick device 1 carries out thickness calibration, generally, the height rolling seam h1 is equal to or slightly less than battery pole piece final thickness, why the height stitching h1 is rolled in selection is slightly less than battery pole piece final thickness, is in order to the active material on anti-upper battery pole piece rebounds upon compression.
Refer to Fig. 3 and Fig. 4, Fig. 3 be embodiment illustrated in fig. 2 in the side structure schematic diagram of three-high mill.Fig. 4 be embodiment illustrated in fig. 2 in the plan structure schematic diagram of three-high mill.That is, multistage roller mill shown in Fig. 3 and Fig. 4 is the situation only having a prepressing device 2, specifically, described three-high mill comprises support 27, described support 27 is provided with surely thick device 1, described fixed thick device 1 comprises the first roll 11 and the second roll 12, a Ge Tiaofeng mechanism 13 is respectively provided with between described first roll 11 and the bearing block at the second roll 12 two ends, described Tiao Feng mechanism is a pair voussoir, the relative position between two voussoirs is regulated by stepper motor or servomotor, reach the object regulating pre-pressure rolling seam size, hydraulic means (not shown) acts on the two ends of described second roll 12 (certainly, also the two ends making in the first roll 11 can be designed to), keep the pre-pressure rolling seam substantially constant between two rolls, described first roll 11 and the second roll 12 are driven by the first motor 14, a prepressing device 2 is also provided with in the side of described second roll 12, described prepressing device 2 comprises pony press 21 and a pair pony press elastic hydraulic pneumatic shuttle 22, form pre-pressure rolling between described pony press 21 and the second roll 12 to stitch, described pony press elastic hydraulic pneumatic shuttle 22 acts on the two ends of described pony press 21 respectively, keep the pressure almost constant of described pony press 21, described pony press 21 is driven by the second motor 28.
During use, battery pole piece 26 gating is crossed pre-pressure rolling seam and is carried out carrying out compacting to the active material on battery pole piece 26, then, then carry out thickness correction by the pre-pressure rolling seam between the first roll 11 and the second roll 12, make the thickness of battery pole piece 26 reach designing requirement.
Refer to Fig. 5, Fig. 5 is the planar structure schematic diagram of the second embodiment of the present invention.The multistage roller mill of a kind of battery pole piece, comprise surely thick device 1, described fixed thick device 1 comprises the first roll 11 and the second roll 12, a Ge Tiaofeng mechanism (not shown) is respectively provided with between described first roll 11 and the bearing block at the second roll 12 two ends, hydraulic means 30 acts on the two ends of described first roll 11 or the second roll 12, keep the pre-pressure rolling seam substantially constant between two rolls, in the present embodiment, also comprise N number of prepressing device 2 ... N, each described prepressing device 2 comprises the first pony press 24, second pony press 25, and a pair pony press elastic hydraulic pneumatic shuttle 22, form pre-pressure rolling between described first pony press 24 and described second pony press 25 and stitch 23, described pony press elastic hydraulic pneumatic shuttle 22 acts on the two ends of described first pony press 24 (also can act on the second pony press 25) respectively, keep the pressure almost constant of described first pony press 24 or the second pony press 25.
The granule integrity of following pony press elastic hydraulic pneumatic shuttle 22, pressure detecting closed-loop adjustment device, Thickness sensitivity closed-loop adjustment device and active material layer that all can adopt in each embodiment above-mentioned detects closed-loop adjustment device.
Refer to Fig. 6, Fig. 6 is the structural representation of the pony press elastic hydraulic pneumatic shuttle in the present invention.Described pony press elastic hydraulic pneumatic shuttle 22 comprises cylinder body 221, first piston 222 and the second piston 223 is provided with in described cylinder body 221, push rod 224 is connected with first piston 222, and stretches out in one end of described cylinder body 221, acts on the two ends of described first pony press 21; Be air zone 225 between described first piston 222 and the second piston 223, described second piston 223 forms hydraulic region 226 away from the one side of air zone 225 with described cylinder body 221, and described hydraulic region 226 is connected with Hydraulic Station (not shown) by hydraulic inlet 227.The present invention owing to being provided with air zone 225 between first piston 222 and the second piston 223, like this, described pony press elastic hydraulic pneumatic shuttle 22 is by first compressed air, roll is acted on again by compressed gas, first piston 222 and push rod 224, because compressed-air actuated volume has certain telescopicing performance, can elastic reaction be played, keep the pressure almost constant of pony press 21, the compaction well to the active material of battery pole piece can be played, and don't cause the curtain coating of active material.Certainly, the pony press elastic hydraulic pneumatic shuttle in the present invention also can be designed to first compressed air part, then by air Partial shrinkage hydraulic part, hydraulic pressure acts on the structure of roll by first piston 222 and push rod 224.Its effect is identical.
Preferably, the present invention also can comprise pressure detecting closed-loop adjustment device, described pressure detecting closed-loop adjustment device comprises pressure transducer, control circuit and mechanical actuating mechanism, described pressure transducer is by detecting the pressure of the pre-pressure rolling seam of described prepressing device 2, and by flowing to control circuit after analog-to-digital conversion, described control circuit regulates the described hydraulic pressure of pony press elastic hydraulic pneumatic shuttle 22 or the size of air pressure according to the change of pressure by described mechanical actuating mechanism.
Preferably, the present invention also can comprise Thickness sensitivity closed-loop adjustment device, described Thickness sensitivity closed-loop adjustment device comprises pole piece thickness measure mechanism, control circuit and executing agency, described pole piece thickness measure mechanism is by detecting the thickness of the battery pole piece after described prepressing device or fixed thick device, and by flowing to control circuit after analog-to-digital conversion, described control circuit comes the hydraulic pressure of pony press elastic hydraulic pneumatic shuttle 22 described in feedback regulation or the size of air pressure according to the change of pole piece thickness by described mechanical actuating mechanism.
Preferably, the granule integrity that the present invention also can comprise active material layer detects closed-loop adjustment device, described granule integrity detects closed-loop adjustment device and comprises digital camera head or radial imaging and control circuit and executing agency, the image on the active material layer surface of described digital camera head or the battery pole piece of radial imaging shooting after described prepressing device or fixed thick device, flow to control circuit, control circuit compares taking the image obtained and the standard picture be pre-stored in control circuit, and come the hydraulic pressure of pony press elastic hydraulic pneumatic shuttle 22 described in feedback regulation or the size of air pressure according to comparative result.
Claims (15)
1. a battery pole piece pressure rolling method, is characterized in that: comprise the steps,
(1), the compacting step of battery pole piece, this step is at least realized by a prepressing device, the spacing of rolling seam of described prepressing device is flexible in the process of rolling pole piece, described in roll seam be realize by acting on the elastic hydraulic pneumatic shuttle formed on this roller rolling in two rollers of seam;
(2), the fixed thick step of battery pole piece, this step is realized by surely thick device, the spacing of rolling seam of described fixed thick device is changeless in the process of rolling pole piece, and the spacing of rolling seam of described fixed thick device is less than or equal to the design thickness of the pole piece after being rolled;
(3), battery pole piece first after compacting, then enters the thickness correction that surely thick step carries out battery pole piece.
2. battery pole piece pressure rolling method according to claim 1, it is characterized in that, described elastic hydraulic pneumatic shuttle comprises the gentle splenium of hydraulic part and divides, described hydraulic part acts on the air of air pressure part or air pressure partial action in hydraulic part, pressure is passed to piston and push rod, push rod remakes for roll.
3. battery pole piece pressure rolling method according to claim 1 and 2, it is characterized in that, also comprising pressure detecting closed-loop adjustment step, by detecting the size of rolling the pressure of seam of described prepressing device, coming the hydraulic pressure of elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure.
4. battery pole piece pressure rolling method according to claim 1 and 2, it is characterized in that, also comprising Thickness sensitivity closed-loop adjustment step, by detecting the thickness of the battery pole piece after described prepressing device or fixed thick device, coming the hydraulic pressure of elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure.
5. battery pole piece pressure rolling method according to claim 1 and 2, it is characterized in that, the granule integrity also comprising active material layer detects closed-loop adjustment step, by detecting the granule integrity of the active material layer of the battery pole piece after described prepressing device or fixed thick device, come the hydraulic pressure of elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure.
6. the multistage roller mill of battery pole piece, comprise surely thick device (1), described fixed thick device (1) comprises the first roll (11) and the second roll (12), a Ge Tiaofeng mechanism is respectively provided with between described first roll (11) and the bearing block at the second roll (12) two ends, hydraulic means acts on the two ends of described first roll (11) or the second roll (12), keep rolling seam substantially constant between two rolls, it is characterized in that, also comprise at least one prepressing device (2), each described prepressing device (2) comprises pony press (21) and a pair pony press elastic hydraulic pneumatic shuttle (22), form pre-pressure rolling between described pony press (21) and described first roll (11) or the second roll (12) to stitch (23), described pony press elastic hydraulic pneumatic shuttle (22) acts on the two ends of described pony press (21) respectively, keep the pressure almost constant of described pony press (21).
7. the multistage roller mill of battery pole piece according to claim 6, it is characterized in that, described pony press elastic hydraulic pneumatic shuttle (22) comprises cylinder body (221), first piston (222) and the second piston (223) is provided with in described cylinder body (221), push rod (224) is connected with first piston (222), and stretch out in one end of described cylinder body (221), act on the two ends of described pony press (21); Be air zone (225) between described first piston (222) and the second piston (223), described second piston (223) forms hydraulic region (226) away from the one side of air zone (225) with described cylinder body (221), and described hydraulic region (226) is connected with Hydraulic Station by hydraulic inlet (227).
8. the multistage roller mill of the battery pole piece according to claim 6 or 7, it is characterized in that, also comprise pressure detecting closed-loop adjustment device, described pressure detecting closed-loop adjustment device comprises pressure transducer, control circuit and mechanical actuating mechanism, described pressure transducer is by detecting the pressure of the pre-pressure rolling seam of described prepressing device (2), and by flowing to control circuit after analog-to-digital conversion, described control circuit regulates the described hydraulic pressure of pony press elastic hydraulic pneumatic shuttle (22) or the size of air pressure according to the change of pressure by described mechanical actuating mechanism.
9. the multistage roller mill of the battery pole piece according to claim 6 or 7, it is characterized in that, also comprise Thickness sensitivity closed-loop adjustment device, described Thickness sensitivity closed-loop adjustment device comprises pole piece thickness measure mechanism, control circuit and mechanical actuating mechanism, described pole piece thickness measure mechanism is by detecting the thickness of the battery pole piece after described prepressing device or fixed thick device, and by flowing to control circuit after analog-to-digital conversion, described control circuit comes the hydraulic pressure of pony press elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure according to the change of pole piece thickness by described mechanical actuating mechanism.
10. the multistage roller mill of the battery pole piece according to claim 6 or 7, it is characterized in that, the granule integrity also comprising active material layer detects closed-loop adjustment device, described granule integrity detects closed-loop adjustment device and comprises digital camera head or radial imaging and control circuit and executing agency, the image on the active material layer surface of described digital camera head or the battery pole piece of radial imaging shooting after described prepressing device or fixed thick device, flow to control circuit, control circuit compares taking the image obtained and the standard picture be pre-stored in control circuit, and come the hydraulic pressure of pony press elastic hydraulic pneumatic shuttle (22) described in feedback regulation or the size of air pressure according to comparative result.
11. 1 kinds of multistage roller mills of battery pole piece, comprise surely thick device (1), described fixed thick device (1) comprises the first roll (11) and the second roll (12), a Ge Tiaofeng mechanism is respectively provided with between described first roll (11) and the bearing block at the second roll (12) two ends, hydraulic means acts on the two ends of described first roll (11) or the second roll (12), keep rolling seam substantially constant between two rolls, it is characterized in that, also comprise at least one prepressing device (2), each described prepressing device (2) comprises the first pony press (24), second pony press (25), and a pair pony press elastic hydraulic pneumatic shuttle (22), form pre-pressure rolling between described first pony press (24) and described second pony press (25) to stitch (23), described pony press elastic hydraulic pneumatic shuttle (22) acts on the two ends of described first pony press (24) or the second pony press (25) respectively, keep the pressure almost constant of described first pony press (24) or the second pony press (25).
The multistage roller mill of 12. battery pole piece according to claim 11, it is characterized in that, described pony press elastic hydraulic pneumatic shuttle (22) comprises cylinder body (221), first piston (222) and the second piston (223) is provided with in described cylinder body (221), push rod (224) is connected with first piston (222), and stretch out in one end of described cylinder body (221), act on the two ends of described first pony press (21); Be air zone (225) between described first piston (222) and the second piston (223), described second piston (223) forms hydraulic region (226) away from the one side of air zone (225) with described cylinder body (221), and described hydraulic region (226) is connected with Hydraulic Station by hydraulic inlet (227).
13. multistage roller mills of battery pole piece according to claim 11 or 12, it is characterized in that, also comprise pressure detecting closed-loop adjustment device, described pressure detecting closed-loop adjustment device comprises pressure transducer, control circuit and mechanical actuating mechanism, described pressure transducer is by detecting the pressure of the pre-pressure rolling seam of described prepressing device, and by flowing to control circuit after analog-to-digital conversion, described control circuit regulates the described hydraulic pressure of pony press elastic hydraulic pneumatic shuttle or the size of air pressure according to the change of pressure by described mechanical actuating mechanism.
14. multistage roller mills of battery pole piece according to claim 11 or 12, it is characterized in that, also comprise Thickness sensitivity closed-loop adjustment device, described Thickness sensitivity closed-loop adjustment device comprises pole piece thickness measure mechanism, control circuit and mechanical actuating mechanism, described pole piece thickness measure mechanism is by detecting the thickness of the battery pole piece after described prepressing device or fixed thick device, and by flowing to control circuit after analog-to-digital conversion, described control circuit comes the hydraulic pressure of pony press elastic hydraulic pneumatic shuttle described in feedback regulation or the size of air pressure according to the change of pole piece thickness by described mechanical actuating mechanism.
15. multistage roller mills of battery pole piece according to claim 11 or 12, it is characterized in that, the granule integrity also comprising active material layer detects closed-loop adjustment device, described granule integrity detects closed-loop adjustment device and comprises digital camera head or radial imaging and control circuit and executing agency, the image on the active material layer surface of described digital camera head or the battery pole piece of radial imaging shooting after described prepressing device or fixed thick device, flow to control circuit, control circuit compares taking the image obtained and the standard picture be pre-stored in control circuit, and come the hydraulic pressure of pony press elastic hydraulic pneumatic shuttle (22) described in feedback regulation or the size of air pressure according to comparative result.
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