CN101847745A - Energy-storing device with low internal resistance and production method thereof - Google Patents
Energy-storing device with low internal resistance and production method thereof Download PDFInfo
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- CN101847745A CN101847745A CN200910220340A CN200910220340A CN101847745A CN 101847745 A CN101847745 A CN 101847745A CN 200910220340 A CN200910220340 A CN 200910220340A CN 200910220340 A CN200910220340 A CN 200910220340A CN 101847745 A CN101847745 A CN 101847745A
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses an energy-storing device with low internal resistance and a production method thereof. A certain blank margin is reserved for a current collector when an electrode plate of the energy-storing device is produced; a core cladding consists of a positive electrode plate, a negative electrode plate and a diaphragm; current collectors of a positive electrode and a negative electrode respectively extend out of two ends of the core cladding; and the current collectors of the positive electrode and the negative electrode of the core cladding of the energy-storing device are respectively welded on a positive electrode end plate and a negative electrode end plate which are provided with lead-out binding posts by adopting a wall-viewing welding process. The energy-storing device suitable for the method comprises a device for storing energy by using an electrochemical principle and a device for storing energy by using a physical principle, such as lithium ion battery, a super capacitor, a double electric layer capacitor, a capacity battery, a high-power battery and the like. The invention can greatly reduce the lead-out resistance of an electrode lug of the energy-storing device, improve the power performance, does not use a transitional electrode lug, further improves the utilization rate of an inner space of the energy-storing device and ensures that the volume power density and the volume energy density of the energy-storing device are higher; and compared with the riveting and crimping, the laser welding is beneficial to further improving the reliability of the device.
Description
Technical field
The present invention relates to a kind of energy storage device and make the field, be specifically related to a kind of energy-storing device with low internal resistance and manufacture method thereof.
Background technology
Power supply is all indispensable piths of various circuit.Do not having under the situation of civil power, only take the mode of power storage could be satisfied the circuit use, therefore various energy storage devices are important component parts of mobile using electricity system, and its performance is directly connected to important indicators such as the useful life, power characteristic of mobile electrical appliance.
Present energy storage device is battery, secondary cell, ultracapacitor etc. once.Primary cell is not chargeable, can't use repeatedly, comprehensive use cost height.But the secondary cell repeated charge is the first-selected energy storage device of present many mobile electrical appliances; At present, common secondary cell has: lead-acid battery, nickel-cadmium cell, Ni-MH battery, lithium ion battery, ultracapacitor etc.Lead-acid battery, nickel-cadmium cell have the pollution of lead, cadmium heavy metal, are just progressively used by the countries in the world restriction; Because the price of nickel rises steadily, the cost performance of Ni-MH battery is also in continuous decline.Lithium ion battery and ultracapacitor are the novel energy-storing devices that occurs in recent years, have tangible performance advantage.Lithium ion battery energy density height, but power density is lower, and the life-span is lacked (about 1000 times); In the ultracapacitor life-span long (can reach more than 100,000 times), power density is big, but energy density is lower.
Device such as electric automobile, the pulse power is all had higher requirement to the power-performance of its energy storage device.Aspect raising energy storage device power-performance, admissible measure has: 1. improve the electrode material prescription, improve the power capability of electrode; 2. improve electrolyte, reduce resistance; 3. improve the lug lead-out mode of electrode, reduce contact resistance.Aspect improving the electrode prescription and improving electrolyte, many researchers have carried out big quantity research, have also obtained bigger progress.After electrode resistance and bath resistance all were reduced to a certain degree, the resistance of drawing of electrode lug just rose to critical positions gradually in whole energy storage device all-in resistance; Promptly need to improve the all-in resistance that the electrode pole ear leading-out could further reduce energy storage device, just can reach the purpose of further raising energy storage device power-performance.But on the lead-out mode of electrode, though some improvement are also arranged, but make little progress, as: (1) is welded on the mode of lug with ultrasonic wave or thorn riveting on the both positive and negative polarity collector, again lug is welded on the metal connecting sheet of end plate, this connected mode welding times is many, needs to reserve lug and brace space at device inside; (2) a plurality of lugs of welding on electrode slice are welded on a plurality of lugs on the little metallic plate, and metallic plate is connected with end plate by the jump ring structure, and this mode requires height to the accuracy of manufacture of jump ring, and easily causes loose contact; (3) soldering polar ear on the electrode slice stays a hole in the heart portion of core bag, by this hole an electrode lug of core bag is welded on the bottom of shell with spot welding machine, another utmost point is welded on lug on the end plate with spot welding machine, this mode still will be used lug, and solder joint is few, and internal resistance is still bigger.
Summary of the invention
The objective of the invention is: the deficiency that on electrode lead-out process, exists at prior art, the manufacture method of a kind of energy-storing device with low internal resistance and this device thereof is provided, thereby the internal resistance of energy storage device is reduced, volume reduces, volumetric power density improves, volume energy density improves.
The invention provides a kind of new energy storage device for achieving the above object, the i.e. outbound course of this device electrode lug and structure, adopt the mode of the saturating wall welding of laser, directly the both positive and negative polarity collector with energy storage device is welded on respectively on the both positive and negative polarity end plate, this method is very beneficial for reducing the internal resistance of energy storage device, improves its power-performance.The present invention takes following technical scheme: a kind of energy-storing device with low internal resistance, comprise device shell, place the core bag and just in the housing, negative end plate, it is characterized in that: the core bag is by the anode pole piece that has plus plate current-collecting body, barrier film is formed with the cathode pole piece that has negative current collector and is made with winding method, energy storage device just, collector when negative plate is made leaves the lay edges edge at least on one side, just, negative current collector stretches out from core bag two ends respectively, and this both positive and negative polarity collector adopts the wall welding procedure directly to be welded on respectively with laser-beam welding machine to have on the both positive and negative polarity end plate of drawing binding post; Described energy storage device comprises by electrochemical principle and carries out the device of energy storage and the device that is carried out energy storage by physical principle.
The energy storage device that this method is fit to comprises by electrochemical principle and carries out the device of energy storage and the device that carries out energy storage by physical principle, as lithium ion battery, ultracapacitor, mixed capacitor, electrochemical capacitor, double electric layer capacitor, capacitor batteries, high power battery etc.
The material of both positive and negative polarity collector of the present invention is at least a kind in aluminium foil, alloy foil, magnesium paper tinsel, magnesium alloy paper tinsel, Copper Foil, copper alloy foil, nickel foil, nickel alloy foil, the stainless steel foil.
One of them is provided with the liquid injection hole of the electrolyte that is used to annotate at least on the both positive and negative polarity end plate of the present invention; The both positive and negative polarity end plate is provided with and its all-in-one-piece metal connection post, and binding post can adopt a kind of in screw bolt-type binding post, riveted joint type binding post, the solder type binding post; The both positive and negative polarity collector is respectively with metal material and adopt the saturating wall welding procedure of laser to be welded on to have the both positive and negative polarity end plate inner face of drawing binding post, and end plate and core bag collector weld can be provided with the less welding groove of thickness, to help implementing the saturating wall welding of laser.
The manufactured materials of both positive and negative polarity end plate of the present invention is at least a kind in aluminium, aluminium alloy, magnesium, magnesium alloy, copper, copper alloy, nickel, nickel alloy, the stainless steel.One of them end plate in the described both positive and negative polarity end plate can be fabricated to one with the energy storage device shell; The outer of another end plate is provided with insulating material; This insulating material can be a kind of in rubber, the plastics or their composite material.Can also place the plastics or the rubber-like insulating material of annular in the end of core bag, to prevent the short circuit of core bag both positive and negative polarity; Core bag project organization is cylindrical or cuboid.
According to said structure, the invention provides a kind of method of making energy-storing device with low internal resistance, it is characterized in that this energy storage device adopts following method preparation:
1) slurry preparation coating: with the anode sizing agent for preparing be coated on the aluminum foil current collector equably, cathode size is coated on the Copper Foil collector, Yi Bian and make collector leave the lay edges edge at least;
2) pole piece is rolling cuts: use to coat to roller mill that the positive and negative electrode sheet of electrode material is respectively rolling to be more closely knit pole piece, with cutting machine rolling good pole piece is cut into suitable size, Yi Bian and make collector remain with the lay edges edge that is not coated with electrode material at least;
3) coiling core bag, dress shell: the positive and negative electrode sheet reeled with barrier film make the core bag, and the collector of both positive and negative polarity is stretched out respectively to core bag two ends, the core bag is put into and bottom plate all-in-one-piece shell again, upper head plate is covered, the inner face of upper and lower end plate is contacted well with the collector at core bag two ends, and upper head plate is enclosed on the shell with revolving the envelope machine;
4) welding: the positive and negative collector that adopts the wall welding procedure from the outside of end plate core bag two ends to be stretched out with laser-beam welding machine is welded on both positive and negative polarity end plate inner face;
5) drying: will weld good goods and put into 100～120 ℃ vacuum drying chamber oven dry 10～48 hours, the moisture content in the core bag is volatilized from liquid injection hole;
6) annotate electrolyte: under vacuum condition, to dry good goods, inject electrolyte, annotate and the liquid injection hole on the shell is temporarily sealed after good from the liquid injection hole of end plate;
7) seasoned, seal: the goods of fluid injection are put on the seasoned machine of battery (also claim formation device), its both positive and negative polarity is connected with the both positive and negative polarity of seasoned machine respectively, carry out seasoned 6～8 hours with seasoned machine after, with the stainless steel steel ball liquid injection hole is sealed.
Characteristics of the present invention are: owing to adopt the mode of the saturating wall welding of laser directly the both positive and negative polarity collector of energy storage device to be welded on respectively on the both positive and negative polarity end plate, therefore without the transition lug, can reduce the resistance of drawing of energy storage device lug significantly, improve its power-performance; Further improved the utilance of energy storage device inner space, thereby the internal resistance of energy storage device has been reduced, volume reduces, made the volumetric power density of energy storage device, volume energy density higher; Volumetric power density improves, volume energy density is higher.Compare with crimping with riveted joint, the laser welding solder joint is many, welding is reliable, helps further improving the reliability of device.
Description of drawings
Fig. 1 leaves the current collector structure schematic diagram on lay edges edge for both sides of the present invention.
Fig. 2 is not for being coated with the current collector structure schematic diagram that electrode material leaves the lay edges edge on one side.
Fig. 3 is a core bag generalized section.
Fig. 4 is an energy storage device housing schematic diagram.
Fig. 5 is the end plate vertical view.
Fig. 6 is the end plate longitudinal section.
Fig. 7 is the whole generalized section of device of the present invention.
Embodiment
Also the present invention is described in detail in conjunction with the accompanying drawings below by embodiment, provides Comparative Examples that effect of the present invention is described simultaneously.Following Example just meets several examples of the technology of the present invention content, does not illustrate that the present invention only limits to the described content of following example, and the technical staff in the industry all belongs to content of the present invention according to the product of claim item of the present invention manufacturing.
Embodiment 1:
1. anode sizing agent preparation (by weight): with business-like lithium ion battery LiMn2O4 95%, conductive black 2%, commercial li-ion battery binding agent L135 (3%) and total amount are the water of 5 times of above-mentioned solid-like total amounts, mix to form uniform slurry in 8 hours in the vacuum planetary mixer.
2. cathode size preparation (by weight): with commercialization lithium ion battery Delanium 91%, conductive black 2%, binding agent SBR (5%), CMC (2%) and total amount are the deionized water of 3.8 times of above-mentioned solid-like total amounts, mix to form uniform slurry in 8 hours in the vacuum planetary mixer.
3. slurry coating: with coating machine be coated in the above-mentioned anode sizing agent for preparing on the aluminum foil current collector equably respectively, cathode size is coated on the Copper Foil collector, and make collector 1 both sides leave the lay edges of 10mm respectively along 12, as shown in Figure 1, the electrode material of the expression of 2 among figure coating.
4. pole piece is rolling: use to coat to roller mill that the positive and negative electrode sheet of electrode material 2 (as shown in Figure 1) is respectively rolling to be more closely knit pole piece, with further increase bond strength, reduce resistance.
5. pole piece is cut: with cutting machine will go up the step rolling good pole piece cut into suitable size, Yi Bian and make collector 1 remain with lay edges along 12, be not coated with electrode material Yi Bian promptly leave certain width, as shown in Figure 2 at collector 1.
6. reel core bag, dress shell: pole piece is wound into cylindrical core bag 10 with commercial li-ion battery diaphragm 3, and anodal collector 1a, the collector 1b of negative pole are stretched out to core bag two ends respectively, its core bag section as shown in Figure 3; Core bag 10 is put into the shell 4 that designs, the structure of shell as shown in Figure 4, shell 4 is an one with bottom plate 7; Again upper head plate 6 (as Fig. 5, shown in Figure 6) is covered, the outer of upper head plate is provided with insulating material 8, the inner face of upper and lower end plate (6,7) is contacted well with the collector (1a, 1b) of the both positive and negative polarity at core bag 10 two ends, and upper head plate 6 is enclosed on the shell 4 with revolving the envelope machine;
7. welding: the both positive and negative polarity end plate is provided with and its all-in-one-piece metal connection post 5, the both positive and negative polarity collector is welded on respectively and has the both positive and negative polarity end plate inner face of drawing binding post 5, method is to use laser-beam welding machine 11 to adopt saturating wall welding procedure the positive and negative collector (1a, 1b) of core bag to be welded on the inner face of upper and lower end plate from the outside of end plate, as shown in Figure 7.
8. dry: as will weld good goods and put into 120 ℃ vacuum drying chamber and dried 36 hours, the moisture content in the core bag 10 is volatilized from liquid injection hole 9.
9. annotate electrolyte: under vacuum, to dry good goods, inject the commercial electrolyte of lithium ion battery, after electrolyte is annotated, the liquid injection hole on the shell is temporarily sealed up with adhesive tape from the liquid injection hole 9 of end plate.
10. seasoned, seal: the goods of fluid injection are put on the seasoned machine of battery (also claim formation device), its both positive and negative polarity links to each other with the both positive and negative polarity of seasoned machine respectively, start seasoned machine carry out seasoned, after seasoned 8 hours with the stainless steel steel ball with liquid injection hole 9 sealings.
Comparative Examples 1:
1. anode sizing agent preparation: with the 1. step of embodiment 1.
2. cathode size preparation: with the 2. step of embodiment 1.
3. slurry coating: with coating machine be coated in the above-mentioned anode sizing agent for preparing on the aluminum foil current collector equably respectively, cathode size is coated on the Copper Foil collector, and the gap coating function of utilizing coating machine makes every 830mm and just stays the wide gap of 15mm not to be coated with electrode slurry, to go on foot the welding electrode ear after an action of the bowels.
4. pole piece is rolling: with the 4. step of embodiment 1.
5. pole piece cut, lug welding: will go up rolling good pole piece of step with cutting machine and cut into suitable size, and be the lug of 10mm is connected on the pole piece coating with supersonic welding gap location with width.
6. reel the core bag, the dress shell: the pole piece that will weld lug is wound into the cylindrical core bag with the commercial li-ion battery diaphragm; The core bag is put into commercial li-ion battery cuboid stainless steel casing.
7. welding: weld together with the lug brace of supersonic welder, weld together with the end plate and the battery case of laser-beam welding machine again with battery with lug and commercial li-ion cell end plate.
8. dry: with the 8. step of embodiment 1.
9. annotate electrolyte: with the 9. step of embodiment 1.
10. seasoned, seal: with the 10. step of embodiment 1.
Embodiment 2:
1. anode sizing agent preparation (by weight): with business-like organic ultracapacitor active carbon 85%, conductive black 8%, commercial li-ion battery binding agent L133 (7%) and total amount are the water of 5 times of above-mentioned solid-like total amounts, mix to form uniform slurry in 8 hours in the vacuum planetary mixer.
2. cathode size preparation: 1. go on foot identical with the of embodiment 2.
3. slurry coating: 3. go on foot identical with the of embodiment 1.
4. pole piece is rolling: 4. go on foot identical with of embodiment 1.
5. pole piece is cut: 5. go on foot identical with of embodiment 1.
6. reel core bag, dress shell: 6. go on foot identical with the of embodiment 1.
7. welding: 7. go on foot identical with the of embodiment 1.
8. dry: as 8. to go on foot identical with the of embodiment 1.
9. annotate electrolyte: under vacuum, to dry good goods, inject the commercial electrolyte (1M Et4NBF4 solvent is an acetonitrile) of organic ultracapacitor, after electrolyte is annotated, the liquid injection hole on the end plate is sealed up with stainless shot from the fabrication hole of end plate.
10. seasoned, seal: the goods of fluid injection are put on the seasoned equipment of ultracapacitor, and its both positive and negative polarity links to each other with the both positive and negative polarity of the seasoned machine of ultracapacitor respectively, starts seasoned machine and carries out seasonedly, detects after seasoned 8 hours.
Detect: with ultracapacitor charge-discharge test instrument the ultracapacitor product of making is tested, discharged and recharged with 40A, its discharge capacity is 3200F, DC internal resistance 0.31m Ω.
Comparative Examples 2:
1. anode sizing agent preparation: with the 1. step of embodiment 2.
2. cathode size preparation: with the 2. step of embodiment 2.
3. slurry coating: with the 3. step of Comparative Examples 1.
4. pole piece is rolling: with the 4. step of embodiment 1.
5. pole piece cut, lug welding: with the 5. step of Comparative Examples 1.
6. reel core bag, dress shell: with the 6. step of embodiment 1.
7. welding: with the 7. step of Comparative Examples 1.
8. dry: with the 8. step of embodiment 2.
9. annotate electrolyte: with the 9. step of embodiment 2.
10. seasoned, seal: with the 10. step of embodiment 2.
Embodiment 3:
1. anode sizing agent preparation (by weight): with business-like lithium ion battery LiFePO 4 85%, active carbon 7.5%, conductive black 0.5%, binding agent SBR (5%), CMC (2%) and total amount are the deionized water of 3.8 times of above-mentioned solid-like total amounts, mix to form uniform slurry in 8 hours in the vacuum planetary mixer.
2. cathode size preparation (by weight): with business-like lithium ion battery carbonaceous mesophase spherules 85%, conductive black 10%, commercial organic ultracapacitor active carbon 0.5%, commercial li-ion battery binding agent L135 (4.5%) and total amount are the water of 5 times of above-mentioned solid-like total amounts, mix to form uniform slurry in 8 hours in the vacuum planetary mixer.
3. slurry coating: 3. go on foot identical with the of embodiment 1.
4. pole piece is rolling: 4. go on foot identical with of embodiment 1.
5. pole piece is cut: 5. go on foot identical with of embodiment 1.
6. be wound as core bag, dress shell: 6. go on foot identical with the of embodiment 1.
7. welding: 7. go on foot identical with the of embodiment 1.
8. dry: as 8. to go on foot identical with the of embodiment 1.
9. annotate electrolyte: under vacuum, inject electrolyte from the liquid injection hole of end plate to dry good goods, electrolyte is formed:
Solvent is ethylene isopropyl ester content 30%, carbonic acid first butyl ester content 40%, dimethoxymethane 20%, oxolane 10%; Solute LiPF
6(its weight be solvent gross weight 10%), LiBF4 (for the solvent gross weight 5%); After electrolyte is annotated, the liquid injection hole on the shell is temporarily sealed up with adhesive tape.
10. seasoned, seal: 10. go on foot identical with of embodiment 1.
Comparative Examples 3:
1. anode sizing agent preparation: with the 1. step of embodiment 3.
2. cathode size preparation: with the 2. step of embodiment 3.
3. slurry coating: with the 3. step of Comparative Examples 1.
4. pole piece is rolling: with the 4. step of embodiment 3.
5. pole piece cut, lug welding: with the 5. step of Comparative Examples 1.
6. reel core bag, dress shell: with the 6. step of embodiment 3.
7. welding: with the 7. step of Comparative Examples 1.
8. dry: with the 8. step of embodiment 3.
9. annotate electrolyte: with the 9. step of embodiment 3.
10. seasoned, seal: with the 10. step of embodiment 3.
Claims (10)
1. energy-storing device with low internal resistance, comprise device shell, place core bag and positive and negative electrode end plate in the housing, it is characterized in that: the core bag is made up of the anode pole piece that has plus plate current-collecting body, barrier film and the cathode pole piece that has a negative current collector and is made with winding method, collector when the positive and negative plate of energy storage device is made leaves the lay edges edge at least on one side, the positive and negative electrode collector stretches out from core bag two ends respectively, and this both positive and negative polarity collector adopts the wall welding procedure directly to be welded on respectively with laser-beam welding machine to have on the both positive and negative polarity end plate of drawing binding post; Described energy storage device comprises by electrochemical principle and carries out the device of energy storage and the device that is carried out energy storage by physical principle.
2. energy-storing device with low internal resistance according to claim 1 is characterized in that: this energy storage device has lithium ion battery, ultracapacitor, mixed capacitor, high power battery, capacitor batteries etc.
3. energy-storing device with low internal resistance according to claim 1 is characterized in that: the material of described both positive and negative polarity collector is at least a kind in aluminium foil, alloy foil, magnesium paper tinsel, magnesium alloy paper tinsel, Copper Foil, copper alloy foil, nickel foil, nickel alloy foil, the stainless steel foil.
4. energy-storing device with low internal resistance according to claim 1 is characterized in that: one of them is provided with the liquid injection hole of the electrolyte that is used to annotate at least on the described both positive and negative polarity end plate; The both positive and negative polarity end plate is provided with the metal connection post with its one, and the both positive and negative polarity collector is welded on the inner face of both positive and negative polarity end plate respectively, and end plate and collector weld can be provided with the welding groove.
5. energy-storing device with low internal resistance according to claim 1, its feature also is: one of them end plate in the described both positive and negative polarity end plate can be fabricated to one with the energy storage device shell; The outer of another end plate is provided with insulating material; Can also place the insulating material of annular in the end of core bag.
6. energy-storing device with low internal resistance according to claim 1 or 5, it is characterized in that: the manufactured materials of described both positive and negative polarity end plate is at least a kind in aluminium, aluminium alloy, magnesium, magnesium alloy, copper, copper alloy, nickel, nickel alloy, the stainless steel.
7. energy-storing device with low internal resistance according to claim 5 is characterized in that: described insulating material can be a kind of in rubber, the plastics or their composite material.
8. energy-storing device with low internal resistance according to claim 1 is characterized in that: described core bag is cylindrical or cuboid.
9. energy-storing device with low internal resistance according to claim 4 is characterized in that: what described binding post can be in screw bolt-type binding post, riveted joint type binding post, the solder type binding post is a kind of.
10. manufacture method as energy-storing device with low internal resistance as described in the claim 1～9 is characterized in that this energy storage device adopts following method preparation:
1) slurry preparation coating: with the anode sizing agent for preparing be coated on the aluminum foil current collector equably, cathode size is coated on the Copper Foil collector, Yi Bian and make collector leave the lay edges edge at least;
2) pole piece is rolling cuts: use to coat to roller mill that the positive and negative electrode sheet of electrode material is respectively rolling to be more closely knit pole piece, with cutting machine rolling good pole piece is cut into suitable size, Yi Bian and make collector remain with the lay edges edge that is not coated with electrode material at least;
3) coiling core bag, dress shell: the positive and negative electrode sheet reeled with barrier film make the core bag, and the collector of both positive and negative polarity is stretched out respectively to core bag two ends, again the core bag is inserted with bottom plate all-in-one-piece shell in, upper head plate is covered, the inner face of upper and lower end plate is contacted well with the collector at core bag two ends, and upper head plate is enclosed on the shell with revolving the envelope machine;
4) welding: the positive and negative collector that adopts the wall welding procedure from the outside of end plate core bag two ends to be stretched out with laser-beam welding machine is welded on both positive and negative polarity end plate inner face;
5) drying: will weld good goods and put into 100～120 ℃ vacuum drying chamber oven dry 10～48 hours, the moisture content in the core bag is volatilized from liquid injection hole;
6) annotate electrolyte: under vacuum, to dry good goods, inject electrolyte, annotate and the liquid injection hole on the shell is temporarily sealed after good from the liquid injection hole of end plate;
7) seasoned, seal: the goods of fluid injection are put on the seasoned machine of battery, and its both positive and negative polarity is connected with the both positive and negative polarity of seasoned machine respectively, carry out seasoned 6～8 hours with seasoned machine after, with the stainless steel steel ball liquid injection hole is sealed.
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