WO2003077348A1 - Batterie aux ions de lithium rechargeable et procede de fabrication correspondant - Google Patents

Batterie aux ions de lithium rechargeable et procede de fabrication correspondant Download PDF

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Publication number
WO2003077348A1
WO2003077348A1 PCT/CN2003/000170 CN0300170W WO03077348A1 WO 2003077348 A1 WO2003077348 A1 WO 2003077348A1 CN 0300170 W CN0300170 W CN 0300170W WO 03077348 A1 WO03077348 A1 WO 03077348A1
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WIPO (PCT)
Prior art keywords
positive electrode
negative electrode
positive
pole
lithium
Prior art date
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PCT/CN2003/000170
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English (en)
Chinese (zh)
Inventor
Yongming Ju
Original Assignee
Yongming Ju
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Application filed by Yongming Ju filed Critical Yongming Ju
Priority to AU2003221286A priority Critical patent/AU2003221286A1/en
Publication of WO2003077348A1 publication Critical patent/WO2003077348A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • 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

Definitions

  • Lithium-ion power battery capable of being repeatedly charged and discharged and manufacturing method thereof
  • the present invention relates to an environmentally friendly battery that can be repeatedly charged and discharged, and more particularly, the present invention relates to a lithium ion power battery that can be repeatedly charged and discharged and a method for manufacturing the same.
  • Cide application 001 01 356.4 discloses "a kind of chrome-fluoride lithium solid power battery that can be repeatedly charged and discharged". Although it is nominally a chrome-fluoride lithium solid power battery that can be repeatedly charged and discharged, its structure and composition are not fully disclosed in practice, so it has little practicality and application value, and it has not fundamentally solved high-power charging and discharging. The problem.
  • the biggest problem of lithium-ion power batteries is the heat generated during the charging and discharging process, and the heat generated during the charging and discharging process has a great adverse effect on the lithium-ion power batteries.
  • an object of the present invention is to provide a lithium ion power battery capable of being repeatedly charged and discharged, which can solve the problem of high power charging and discharging of the lithium ion power battery.
  • the present invention provides a lithium-ion power battery that can be repeatedly charged and discharged.
  • Each single battery consists of a cover plate, a negative pole, a safety valve, a positive pole, a current collector plywood, an inner body, an electrolyte, a cylindrical shape or a square shape.
  • the outer casing is composed of the following features:
  • the positive electrode and negative electrode groups that is, the positive electrode sheet, the negative electrode sheet, and the separator together form an electrode assembly with a disc structure; the positive electrode post is connected to the positive electrode, and the negative electrode post is connected to the negative electrode.
  • the poles are connected; the positive electrode is selected from a certain thickness of aluminum foil, and both sides are coated with a positive electrode active material; the negative electrode is selected from a copper foil of a certain thickness, and both sides are coated with a negative electrode active material having large leaf multipole ears and narrow rectangular pieces (also known as Shown into a piece), large leaf monopoles, large leaf multipoles are collectively called large leaf poles.
  • Large-leaf poles can be either raised or hidden, and the current is exported to the pole through the current collector splint; the positive pole has one or several pole poles, the negative pole has one or several pole poles, The number can be equal or different, and the diameters of the poles can be equal or different.
  • the present invention adopts a structure with large leaf poles that can reduce the current density, which can avoid the extremely harmful heat generated in the lithium ion power battery to the greatest extent.
  • the invention also provides a safety valve for a lithium ion power battery that can be repeatedly charged and discharged.
  • the compression spring is installed in the inner hole of the adjustment bolt, and the inner hole of the adjustment bolt is used to hold the compression spring and seal the steel ball. Stable, the compression spring can slide down vertically in the inner hole of the adjusting bolt, the sealing steel ball can slide down vertically in the inner hole of the adjusting bolt, and the outer diameter of the adjusting bolt is processed with a thread that matches the safety valve body
  • the adjusting bolt is processed with several vertical exhaust grooves, and the lower part of the exhaust groove is provided with exhaust holes; the compression spring is pressed on the upper part of the steel ball, and the lower hole of the sealed steel ball is trapped on the cover injection port.
  • the pressure relief hole at the bottom of the safety valve communicates with the injection hole on the cover.
  • the present invention also provides a lithium-ion power battery that can be repeatedly charged and discharged and a manufacturing method thereof, including the following steps: batching- ⁇ coating (pulling)- ⁇ slicing (if the tabs are directly cut, there is no Welding lugs)- ⁇ rolling- ⁇ making (welding) lugs- ⁇ winding (including casing and sealing), filling- ⁇ forming- ⁇ dividing volume.
  • the invention has a uniquely designed current collecting (current collecting) terminal, that is, an inner body formed by winding positive and negative electrodes of a large leaf tab and a diaphragm at the same time, which is more sensitive to internal pressure, and thus more reliable, safe and secure.
  • the current collecting plywood with better valve, current collecting performance and heat dissipation performance can solve the high-power repeated charging and discharging requirements of the lithium ion power battery, thereby realizing the wide application of the lithium ion power battery.
  • Figure 1A shows a cross-sectional view of a lithium-ion power battery using a cylindrical case
  • FIG. 1B is a top view of a lithium-ion power battery with a cylindrical case
  • Figure 1C shows the winding of the positive and negative pole pieces of a lithium-ion power battery with a cylindrical case
  • FIG. 2A shows a top view of a lithium-ion power battery with a square case
  • Figure 2B shows the winding method of the positive and negative plates of a lithium-ion power battery with a square case
  • Figure 3 is a sectional view of a lithium-ion power battery with a square case
  • Figures 4A, 4 A-1, 4B, 4B-1, 4 C, 4 C-1 4D, and 4D-1 are large-leaf monopoles and large Schematic diagram of leaf multipole;
  • Figures 5 and 6 show the structure of a pressure spring type and a plate type safety valve, respectively.
  • each unit battery consists of a cover plate 1, a negative pole 2, a safety valve 3, a positive pole 4, and an open case.
  • the inner body 7 is composed of: in the inner cavity of the lithium-ion power battery, there is a current collector plywood (also referred to as a pole piece plywood) 6, an electrolyte 8, a negative electrode piece 12, a positive electrode piece 1 3, and a separator 19.
  • the outer casing 9, the cover plate 1, the negative pole 2, the safety valve 3, and the positive pole 4 constitute the outer body of the lithium-ion power battery; the positive and negative pole piece groups, the diaphragm, and the current collector plye constitute the inner body 7 of the lithium-ion power battery.
  • the structure of a wound lithium-ion power battery is described in detail below.
  • the wound inner body 7 of a lithium-ion power battery is composed of a positive electrode, a negative electrode sheet, and a separator.
  • the electrode assembly has a disc-shaped structure as shown in FIG. 1C or FIG. 2B.
  • Figure 4 A-1 is a relatively narrow rectangular piece.
  • the positive electrode 1 3 is composed of an aluminum foil and a positive electrode active material.
  • the aluminum foil is a thin metal foil, and both sides are coated with a positive electrode active material (either lithium cobaltate, lithium manganate or lithium nickelate, or nickel cobalt acid). Lithium).
  • the surface of the aluminum foil is usually smooth, but the aluminum foil with a rougher surface has better adhesion for coating active materials.
  • the suitable aluminum foil thickness ranges from 10 ⁇ m to 80 ⁇ m. When seeking 1 C ⁇ 2 C, exclude other influencing factors.
  • the optimal thickness of aluminum foil is 15 ⁇ m ⁇ 2 5 ⁇ . When charging and discharging requirements are 2 C ⁇ 3 C or greater, exclude other influencing factors and use aluminum foil.
  • the optimal thickness is 20 ⁇ m to 4 5 ⁇ m or more.
  • the negative electrode 1 2 is composed of a copper foil and a negative electrode active material.
  • the copper foil is a thin metal foil, and both sides are uniformly coated with a collection of negative electrode active materials (either natural graphite, flake graphite, artificial graphite, or petroleum coke). Electric body.
  • the surface of the copper foil is usually smooth, but the copper foil with a rougher surface has better adhesion for coating active materials.
  • the suitable thickness of copper foil is 6 ⁇ ⁇ ⁇ 50 ⁇ ⁇ . When the charge and discharge requirements are 1 C ⁇ 2 C, other factors are excluded.
  • the optimal thickness of copper foil is 8 ⁇ ⁇ ⁇ 2 0 ⁇ ⁇ ; charge and discharge When 2 C ⁇ 3 C or more is required, other factors are excluded, and the optimal thickness of copper foil is 15 ⁇ m to 3 5 ⁇ m or more.
  • the thickness of the metal foil is not only related to the area of the current collector, but also to the capacitance of each single-piece pole piece.
  • the thickness of the metal foil should be slightly thicker. Where possible, the metal foil should be as thin as possible, in order to obtain a larger electrode sheet area when applying the same amount of active material, thereby obtaining better electrical properties.
  • the metal foil used for the positive electrode or the negative electrode can also be separately Use wire mesh or flat mesh metal foil.
  • the so-called flat mesh metal foil is formed by punching a number of fine small holes mechanically or chemically or by other methods on a thin aluminum or copper foil, and stretching it in the vertical and horizontal directions.
  • Active materials (excluding conductive agents, binders, and dispersants) of previous lithium-ion batteries accounted for about 90% of the total ingredients, and the remaining about 10% were conductive agents, binders, and dispersants.
  • the amount of active material of the lithium ion power battery involved in the present invention is greatly increased, whether it is the positive electrode or the negative electrode, which is about 93% to 95% or even higher.
  • the density of the positive electrode active material is 0.02 g to 0.06 g per square centimeter, and the optimal density of the positive electrode active material is 0.03 2 g to 0 ⁇ 0 4 2 g per square centimeter; Density per square centimeter is about 0. 0 1 g ⁇ 0. 0 3 g, the optimal density of the negative electrode active material per square centimeter is 0. 0 1 4 g ⁇ 0.
  • the main characteristics of lithium-ion power batteries should be suitable for power applications, and they must meet the requirements of high-power charge and discharge.
  • An important structure in the present invention is to use a large-area collector (current-collection) terminal, that is, a large leaf tab, which is more conducive to current conduction and heat dissipation, and can fully meet the requirements of high-power charge and discharge.
  • the current collecting (collecting) terminal is called a large leaf tab.
  • FIG. 4A and Figure 4A-1 Those with only one pole tab on each pole piece are called large leaf monopoles, as shown in Figure 4A and Figure 4A-1, and those with several pole pieces on each pole piece are called large leaf multipole ears, as shown in Figure 4B, Fig. 4B-1; Fig. 4C, Fig. 4C-1; Fig. 4D, Fig. 4D-1.
  • the positive and negative pole pieces should be cut into elongated pieces that conform to the process size and shape.
  • the size of the positive and negative electrode sheets varies due to their process requirements. Since the price of the active material of the positive electrode is much more expensive than that of the negative electrode, the length and width of the negative electrode sheet are slightly larger than those of the positive electrode when cutting. This method saves resources and gives full play to the material properties of the positive electrode, that is, the area of the positive electrode sheet is slightly smaller than that of the negative electrode sheet, and the area of the negative electrode sheet is slightly larger than that of the positive electrode sheet.
  • the positive electrode 1 3 and the negative electrode 1 2 are usually cut into monopole ears with large leaves (1 1 /
  • large leaf tabs can also be processed by roll cutting or shear stamping to form the pole pieces directly.
  • the positive and negative electrodes usually have only one large leaf tab; for the lithium-ion power battery with larger capacity, there are several large leaf tabs. Therefore, when necessary, the positive and negative electrodes can also be made into large-leaf multipolar ears as shown in Figure B and Figure B-1. Thermal performance will also be better.
  • the width of the tabs of the large leaf tabs 1 1 for the positive electrode and the large leaf tabs 10 for the negative electrode should be as large as possible in cross-section, if possible, that is, the tabs should be as wide as possible and as wide as possible. Thick, the current collecting (collecting) path should be as short as possible, which is conducive to the extraction and heat dissipation of the current. Of course, the larger the width of the large leaf pole ears, the better it is for diversion and heat dissipation.
  • the large leaf tabs on the positive and negative electrodes are pulled out from the same direction, for example, as shown in Figures 4A and 4A-1, whether it is a large leaf monopole or a large leaf multipole, whether it is the last roll
  • the maximum width of the large leaf tabs must be less than half (1/2) of the circumference of the stack where the large leaf tabs are located or formed.
  • the lugs of a larger-capacity power battery and the lugs of a smaller-capacity power battery obviously need to be wider to meet the requirements in terms of the performance of current conduction, heat dissipation, and high-rate charging and discharging.
  • the pitch of the large-leaf multi-pole ears is different. Continue winding, and the pole ears on the pole pieces must be coincident at the same position in order to fit the current collector plate neatly.
  • the distance between the large-leaf multipole ears is related to the diameter (perimeter) of the inner body 7 with a cylindrical shell, and to the circumference of the inner body 7 with a square shell. Because the inner body 7 of the wound lithium-ion power battery is wound, the perimeter of each roll is different. The perimeter of the inner roll is smaller than the perimeter of the outer roll.
  • the pitch of the condyles is smaller than the pitch of the outer condyles.
  • the large-leaf multipole ear Leaf poles also vary in width. If a cylindrical shell is used, the width of the inner condyle is gradually smaller than the width of the outer condyle; if a square housing is used, the width of the inner condyle can be gradually smaller than the width of the outer condyle, or it can be the same width. .
  • the width of the inner condylar ear is very different from the width of the outer conical ear. Therefore, in most cases, the width of the inner condyle is equal to the width of the outer condyle. In other words, the width of the inner ear can be as wide as the width of the outer ear if the requirements are not very strict.
  • the width of the large leaf tabs on the positive electrode 13 is the same as the width of the large leaf tabs on the negative electrode 12.
  • the width of the respective large leaf tabs on the positive and negative electrodes can also be unequal under special requirements.
  • the tab widths on the positive and negative electrodes should be equal.
  • the width of the large leaf tabs on the negative electrode 12 can be larger than the large leaf tabs on the positive electrode 1 3; Case, positive The width of the large leaf tab on 13 may be greater than the width of the large leaf tab on the negative electrode 12.
  • the maximum height of the large leaf tab is usually not greater than its own (large leaf tab) width, preferably smaller than its width.
  • the larger leaf monopole ears of the wound lithium ion power battery should be led out as far as possible from the middle of the pole piece.
  • the large-leaf monopole ears of the wound lithium-ion power battery can be led out from the positions close to the two ends of the pole piece. That is to say, the large-leaf monopole can be drawn from the middle of the pole piece, or from the positions near the two ends of the pole piece.
  • connection between the large lobe pole and the current collector can be a clear angle (that is, the connection is a right angle, an obtuse angle without an arc), or a smooth arc connection (that is, the connection has an R angle), as shown in Figure A.
  • R in the connection of Figure A-1 not only has higher mechanical strength, but also helps to prevent the concentration of heat and cause the pole tabs to be melted or even the pole pieces to be destroyed.
  • the positive and negative plates of lithium-ion power batteries use corresponding tabs, that is, when the positive electrode 1 3 uses large-leaf monopoles, and the negative electrode 12 usually uses large-leaf monopoles; the positive electrode 1 3 uses large-leaf multipoles.
  • the ears and the negative poles 1 2 should also adopt large leaf multipole ears.
  • the tabs on the positive and negative electrodes should be equivalent and the number should be equal.
  • large-leaf multipole ears can be used for the negative electrode, and large-leaf monopoles can be used for the positive pole; in the case of high-power discharge without fast high-power charging, Large-leaf multipole ears can be used for the positive pole, and large-leaf monopole ears can be used for the negative pole.
  • the manufacturing methods of the tabs are directly cut heads 10, 11 or welded tabs.
  • the so-called raised-ear type ears show that the ears are significantly higher than the part coated with the active material on the pole pieces, which has the advantage of being easy to scrape powder.
  • the ears shown in Figures 4D and 4D-1 are hidden-head style ears.
  • the form of the hidden head is exactly the opposite of that of the raised head.
  • Such Vietnamese-headed large leaf pole ears 17 and 18 can more fully utilize the space of the inner cavity of the lithium ion power battery.
  • the tabs 1 5 and 1 6 can be made by welding as shown in Figures 4C and 4C-1. Welding of several metal pieces not only increases the mechanical strength, improves the conductivity, but also improves the heat dissipation performance. Therefore, it is best to use a welded large leaf tab for the large leaf tab. Welds 1 4 must be firm. The advantage of welding the lugs is that there is less burr on the cut pieces.
  • the positive electrode is made of aluminum
  • the negative electrode is made of nickel or copper.
  • the shape of the large leaf tabs can be square, rectangular, half-moon (circular), trapezoidal, or other shapes that facilitate flow and heat dissipation.
  • the best tab shape is a trapezoid with R rounded corners at the connection.
  • the negative electrode 12 is usually placed on the outer layer during winding.
  • the positive electrode 13 can also be placed on the outer layer.
  • the positive and negative electrode sheets must be stacked together and wound to make the inner body.
  • the pole piece When the pole piece is folded inwardly, it may cause powder removal, so it should be considered to process the folding line on the pole piece inwardly folded.
  • the active material at the fold line must be scraped off.
  • Lithium-ion power batteries with cylindrical casings usually do not require folding lines for the positive and negative electrodes. Of course, folding lines can also be processed as needed. If a square shell is used, since the positive electrode 13 is relatively brittle and hard, the first bend has a large degree of deflection, which is easy to cause powder removal and even breakage. In order to prevent the positive electrode 13 from being powdered and broken, the folding line 20 should normally be processed at the first bend of the positive electrode sheet as shown in Fig. 4A, Fig. 4B, Fig. 4C, and Fig. 4D; Simultaneous processing of fold lines at two bends 2 0-
  • the center distance between the folding line 20 and the folding line 20-1 should meet the width of the square needle. Regardless of the width of the folding line 20 or the folding line 20-1, it should be larger than the thickness of the square curling needle.
  • the lithium-ion power battery with a cylindrical casing has a wound inner body 7 that is cylindrical and has a rectangular longitudinal section.
  • the ratio of the diameter of the inner body to its height (aspect ratio), the ideal aspect ratio is 1: 2, that is, the diameter (height) is 1 and the width is
  • the lithium-ion power battery with a square casing has a rectangular inner body 7 after winding, and the ideal aspect ratio is 6. 2: 3. 8 or 6: 4.
  • the basic function of the separator is to separate the positive and negative electrodes, prevent the battery from short-circuiting, and adsorb and maintain the electrolyte.
  • the separator In addition to having good insulation properties, stable chemical and electrochemical properties, the separator must have a certain mechanical strength and a high electrical conductivity. Ratio, it is most suitable to use porous polyolefin materials. In view of the characteristics that lithium-ion power batteries must be charged and discharged with high power, higher safety performance is required.
  • the lithium-ion power battery involved in the present invention mainly uses a polyethylene separator with a thickness of 15 to 80 ⁇ m, which has a microporous structure and a low current cut-off temperature.
  • the selection principle of the separator is as thin as possible, but when the area of the positive or negative electrode piece is less than or equal to 100 Ornm ⁇ 500 mm and greater than or equal to 100 mm ⁇ 50 mm, the charge and discharge requirements are 1 C ⁇ 2 C, Excluding other influencing factors, the optimal thickness of the separator is 25 ⁇ m to 40 ⁇ m; when charging and discharging requirements are 3C or greater, excluding other influencing factors, the optimal thickness of the separator is 4 ⁇ or more. When the battery internal temperature is higher than the limit value
  • Lithium-ion power battery can also be made of polypropylene.
  • the separator of the lithium ion power battery can also be directly coated with a slurry of a polyolefin-based material containing a reasonable amount of a pore-forming agent on the surface of the positive electrode sheet that has been rolled.
  • the separator 19 is generally made in a long shape, and the area of the separator is larger than the positive and negative electrodes no matter the length or width. Except for the ears, the separator 19 must completely shield the positive electrode 13 or negative electrode 1 2 from the periphery, and the edges must not be exposed. In case of short circuit.
  • the material of the lithium ion power battery pole is a metal material with excellent electrical and thermal conductivity. In addition to a certain strength, it must also have good heat dissipation performance.
  • the pole can be cylindrical or sheet-shaped to facilitate faster heat dissipation by lithium ion power.
  • the poles can be installed on any side surface of the lithium-ion power battery; according to different needs, the positive and negative poles can also be installed on different side surfaces of the lithium-ion power battery.
  • one positive pole and one negative pole of a lithium-ion power battery can meet the needs.
  • more poles of a larger-capacity lithium-ion power battery may be installed, for example, two positive poles and two negative poles may be installed at the same time.
  • the number of positive and negative poles may be equal or different.
  • the number of positive and negative poles should be equal; in the case of fast high-power charging without high-power discharge, the number of negative poles can be the same as that of the positive pole
  • the number of poles is equal to or greater than the number of positive poles; in the case of high power discharge without fast high power charging, the number of positive poles may be equal to or greater than the number of negative poles.
  • the diameter of the pole can also be adjusted to meet the above needs.
  • the diameters of the positive and negative poles should be equal; in the case of fast high-power charging without high-power discharge, the negative pole
  • the diameter of the pole can be equal to or larger than the diameter of the positive pole; in the case of high power discharge without fast high power charging, the diameter of the positive pole can be equal to or larger than the diameter of the negative pole The diameter of the pole.
  • Lithium-ion power batteries use multiple electrolytes to accommodate wider temperature changes.
  • Multi-component electrolyte refers to a mixture of two or more solvents and lithium hexafluorophosphate.
  • the lithium-ion power battery uses:
  • LIPF 6 lithium hexafluorophosphate
  • EC ethylene carbonate
  • DEC dimethyl carbonate
  • the solvent ratio is 0.9 5 to 1. 0 5: 0. 9 5 ⁇ 1. 0 5: 0.9 5 ⁇ 1. 0 5; or
  • the lithium-ion power battery case according to the present invention is a part of a lithium-ion power battery, and is also called a battery case.
  • the cell case is also one of the positive and negative electrodes.
  • the cell case is also called the electrode case.
  • the cell case of high-power lithium-ion power batteries should be avoided as much as possible.
  • the cell shell of a high-power lithium-ion power battery cannot be an electrode shell, and the shell must be insulated from the pole.
  • the case can also become an electrode case.
  • the cell case of a wound lithium-ion power battery can be square (including rectangular) or cylindrical.
  • the cylindrical shell consists of a flat surface above and below, and It consists of a cylindrical curved surface and a square shell composed of six planes.
  • the battery cell and the cover plate are complementary.
  • the battery case is square, the cover plate is square, the battery case is cylindrical, and the cover plate is circular.
  • Lithium-ion power battery cell shells have higher airtightness requirements and higher strength, usually metal shells with a certain rigidity, such as stainless steel cell shells.
  • the cell shell of the lithium-ion power battery of the present invention can be either a metal shell, or made of polytetrafluoroethylene or polypropylene or other suitable plastics, and can be bonded or injection-molded. The safety performance is better than that of metal cells. shell.
  • the upper or side of the shell of the lithium-ion power battery is designed and processed with plug-in ports that are convenient for series and parallel connection, so that the batteries can be connected in series or in parallel to form a battery pack.
  • heat sinks can be designed and processed on or inside the housing
  • the cover of the lithium-ion power battery must match the battery case, and the airtightness is high.
  • the cover of the lithium-ion power battery can also be made of PTFE or polypropylene or any other strong acid-resistant plastic with a certain strength and injection molding.
  • the safety valve 3 of the lithium-ion power battery is very important. It is a safety device provided to prevent other accidents such as overcharge and short circuit. It can instantly remove the pressure exceeding the design.
  • the pressure relief hole at the bottom of the safety valve is also the injection port for the lithium-ion power battery.
  • the structure of the pressure spring safety valve is shown in Figures 5-1 and 5- 2.
  • the compression spring (spring) 2 5 is installed in the inner hole of the adjustment bolt 2 3.
  • the inner hole of the adjustment bolt is actually a retainer for the compression spring and the sealed steel ball 2 2.
  • the compression spring can be vertically moved up and down in the inner hole of the adjustment bolt.
  • the sliding steel ball can not swing laterally, and the sealing steel ball can also slide vertically in the inner hole of the adjusting bolt without swinging horizontally.
  • the outer diameter of the adjustment bolt is processed with a thread matching the safety valve body 21, so the adjustment bolt is installed on the safety valve body, and the height can be adjusted at will through the key hole 27, which also serves as an exhaust.
  • the adjusting bolt is processed with a plurality of vertical exhaust grooves 2 4. Through the exhaust groove, the adjusting bolt can be rotated to rotate, and an exhaust hole 2 8 is opened at the lower part of the exhaust groove.
  • the lowest layer is fluoro rubber ⁇ 26 or other corrosion-resistant rubber pads, which are pressed or attached to the liquid injection holes on the lid 1 of the lithium ion battery, and the sealed steel ball is trapped under fluoro rubber ⁇ 26 or other resistant materials. Corroded rubber pad.
  • the pressure relief hole at the bottom of the safety valve communicates with the liquid injection hole on the cover plate 1, so the pressure relief hole is the liquid injection hole when the liquid is injected.
  • the fluorine rubber ring or other corrosion-resistant rubber pads must have some elasticity, so that when the steel ball is pressed against the fluorine rubber pad or other corrosion-resistant rubber pads, the fluorine rubber pads or other corrosion-resistant rubber pads deform
  • the injection hole can be sealed.
  • the compression spring is pressed against the upper part of the sealed steel ball with the inner inner part of the bottom part, and the lower part of the sealed steel ball is trapped on the fluorine rubber on the battery cover ⁇ 2 6 or other corrosion-resistant rubber pads to restrain the sealed steel ball from slipping. open.
  • the sealed steel ball automatically closes the injection port due to the pressure of the compression spring to keep the inside of the battery isolated from the external environment.
  • the structure of the tablet safety valve is shown in Figure 6-1 and 6-2.
  • the reverse bow spring piece 30 is installed at the lower part of the adjusting bolt 23, and the adjustment bolt is processed with a thread matching the safety valve body 21. Therefore, the adjustment bolt is installed on the safety valve body, and the bottom is pressed tightly on the reverse bow spring piece. Hole 8 adjusts the height of the bolt and adjusts the tension of the anti-bow spring.
  • the safety valve body is processed with a rectangular exhaust groove 31, and the anti-bend spring is installed in the rectangular groove. It can not be rotated horizontally except it can spring up and down.
  • the inner diameter of the lower part of the safety valve body is small, forming a cage, and the sealing steel ball 22 can be vertically moved down in the cage.
  • the anti-bow spring is processed with a process assembly hole 33, which is crimped on the upper part of the steel ball to fix the sealed steel ball.
  • the lower hole of the sealed steel ball is trapped on the fluoro rubber ⁇ or other corrosion-resistant rubber pad on the cover injection port, which not only fixes the sealed steel ball, but also seals the battery.
  • fluororubber or other corrosion-resistant rubber mats must have some elasticity, so that when the steel ball is pressed against the fluororubber or other corrosion-resistant rubber mats, the fluororubbers or other corrosion-resistant rubber mats will deform.
  • the injection hole can be sealed.
  • the compression spring is snapped on the upper part of the sealing steel ball with the inner ⁇ at the bottom, and the lower part of the sealing steel ball is trapped on the fluoro rubber ⁇ 26 on the battery cover plate, restraining the sealing steel ball from sliding away.
  • the sealed steel ball automatically closes the injection port due to the pressure of the compression spring to keep the inside of the battery isolated from the external environment.
  • the pressure inside the battery is greater than the set value, it will The pressure of the sealed steel ball is automatically lifted to release pressure, and the gas is instantly discharged from the pressure relief hole 29, and escapes from the exhaust hole 32 and the key hole 27 along the exhaust groove 31.
  • the pressure of the anti-bow spring is sufficient to compress the sealing steel ball again to seal the pressure relief hole.
  • the fluorine rubber ring 26 may be replaced by any other suitable rubber.
  • the anti-bow shrapnel can be designed and processed into a flat shape or a half-moon shaped anti-bow shrapnel as shown in Figure 6-1.
  • the working principle of the flat anti-bow shrapnel is the same as that of the half-moon anti-bow shrapnel.
  • the pressure of the tablet-type safety valve can also be adjusted by the screws 3 4 shown in Figure 6-2.
  • the safety valve can also be designed with several vent holes 3 5 in the body.
  • the pressure relief hole 2 9 on the fluorine rubber ⁇ 2 6 and the liquid injection hole on the cover plate 1 are communication holes and also communicate with the pressure relief hole on the bottom of the safety gang, so they are not marked separately.
  • the sealed steel ball 2 2 can be designed and processed into a ball 2 2-1 with horizontal transverse grooves, and the fluorine rubber ⁇ 2 6-1 is hung on the sealed steel ball. 2 2-1 in the horizontal slot.
  • the fluorine rubber ⁇ 2 6-1 seals the injection hole.
  • a fixed small handle 3 5 can also be processed thereon, and a compression spring or an anti-bow spring is sleeved on the fixed small handle.
  • the compression spring or reverse bow spring presses the sealing steel ball 2 2-1 and the fluorine rubber ⁇ 2 6-1 tightly seals the injection hole.
  • the internal pressure is higher than the allowable value, the sealed steel ball 2 2-1 is lifted, and the fluoro rubber ⁇ 2 6-1 is lifted upwards at the same time, and the internal pressure is quickly released.
  • the sealing steel ball 2 2 can also be designed and processed into a sealing frustum 2 2-2. Compared with the steel ball 2 2 or 2 2-1, the lower part of the sealing frustum protrudes into the injection hole, so Bit more reliable.
  • the sealing frustum can also be processed with a fixed small handle 3 6, and a compression spring or an inverse bow spring is sleeved on the fixed small handle. When the internal pressure is less than the allowable value, the compression spring or reverse bow spring presses the sealing frustum 2 2-2, and the pressure of the fluorine rubber ⁇ 26 in the sealing frustum deforms to tightly seal the injection hole. When the internal pressure is greater than the allowable value, lift the sealing cone 2 2-2 and quickly remove the internal pressure.
  • the sealing frustum can also be designed and machined as 2 2-3, which has a horizontal horizontal groove, and the fluoro rubber ⁇ 2 6-1 is hooped in the horizontal horizontal groove on the sealing frustum 2 2-3.
  • the fluorine rubber ⁇ 2 6-1 seals the injection hole.
  • the internal pressure is larger than the permissible value, when the sealing cone 2 2-3 is lifted up, the fluorine rubber ⁇ 2 6-1 is lifted upward at the same time, and the internal pressure is quickly released.
  • the sealing steel ball 2 2 or 2 2-1 or the sealing frustum 2 2-2, 2 2-3 can also be designed as a hollow sleeve, and the compression spring is inserted into a hollow sleeve with better guiding performance. in.
  • the safety valve and the pole should be installed on the same side surface of the lithium-ion battery case, but they can also be installed on different side surfaces as required.
  • safety valves and poles can be installed on any side surface of the lithium-ion power battery.
  • a large-capacity lithium-ion power battery may have several safety valves installed on the same side surface or on different side surfaces.
  • the medium for preparing the slurry includes NM P (N-methyl-2 -pyrrolidone) as the medium or water (deionized water, distilled water, purified water) as the medium; the preparation methods include wet method and dry method.
  • the NMP medium is described first, and then the water medium is described.
  • the wet method is first described (there are also wet methods: sequential preparation method and mixed preparation method), and then the dry method is described. (Positive). It is described below:
  • NM P positive electrode.
  • PVDF, graphite (or acetylene black), and carbon black all need to be about 120. C Bake in an oven for about 2 to 3 hours.
  • Sequential preparation method After adding PVDF to NMP and stirring for about 3 to 4 hours, add conductive agent graphite (or acetylene black), carbon black and stir for about 0.5 to 1 hour, and finally add lithium cobaltate and stir for about 2.5 to 4 hours to become viscous. Pasty.
  • CMC is added to the water and stirred for about 3 to 4 hours, then SBR is added to it and stirred for about 0.5 to 1 hour, and then conductive agent graphite (or acetylene black) and carbon black are added and stirred for about 0.5 to 1 hour, and finally cobalt is added.
  • the lithium acid is stirred for about 2.5 to 4 hours to form a thicker slurry. Sieve out agglomerates and other impurities.
  • the preparation of the positive electrode must be slightly larger than the conductive agent.
  • NMP NMP
  • Materials required: Graphite 93% ⁇ 95% PVDF 5% ⁇ 7%, NMP is about 8% of the total amount of all the aforementioned substances 0% ⁇ 15 0% is the solid-liquid ratio-1: 0 ⁇ 8 ⁇ 1. 5; the optimal solid-liquid ratio 1: 1 ⁇ 1.3.
  • PVDF needs a temperature of about 120. B oven in C oven for 2 ⁇ 3 hours, graphite needs to be baked at 300 ° C ⁇ 500 ° C for 4 ⁇ 8 hours.
  • Sequential preparation method Add P V D F to NM P and stir for about 3 to 4 hours. Then add the graphite that has been sifted through a 3 2 5 mesh screen and stir for about 3 to 4 hours to form a thick slurry.
  • Sequential preparation method Add CMC to water and stir for about 3 to 4 hours, then add SBR to it and stir for about 0.5 to 1 hour. Finally, add graphite after baking and sieving through 300 mesh. Stir for about 3 to 4 hours to become viscous. Pasty.
  • Dry preparation Dry preparation of the positive electrode with N M P as the medium. Materials required: Materials required: PVDF 2.5% to 3.5%, lithium cobaltate 93% to 95%, conductive agent graphite 1.5% to 2% (or acetylene black 0.8% to 1 .
  • N M P is limited by the particle size and particle size distribution of the foregoing materials, especially lithium cobaltate, so it is about the total amount of all the foregoing materials.
  • the particle size of the conductive agent must be equal to or smaller than the positive electrode material (lithium cobaltate, lithium manganate, lithium nickel cobaltate).
  • the medium In order to ensure the quality of the prepared slurry, whether the water (deionized water, distilled water, purified water) or NMP is used as the medium during the preparation of the slurry, it must be based on the particle size, particle size distribution, and conductive agent of the positive electrode material. The amount is carefully calculated, and the medium is added once and cannot be added halfway. The same is true for the negative electrode, whether it is water (deionized water, distilled water, purified water) or NMP as the medium, it must be based on the anode material. And the amount of additives is finely calculated, and the medium should be filled in one time. Do not add it halfway. Otherwise, it is difficult to ensure the quality of the positive electrode slurry or the negative electrode slurry.
  • the active material used for the positive electrode of the lithium-ion power battery can also be lithium manganate, lithium nickelate, or lithium nickel cobaltate.
  • the preparation method is basically the same as that of the foregoing lithium cobaltate preparation method.
  • the particle size of the lithium ion battery positive electrode material can be selected in the range of 2 ⁇ m to 12 ⁇ m, but the optimal particle size should be 5 ⁇ m ⁇ 8 ⁇ m;
  • the particle size distribution of the cathode material must also be as narrow as possible. Taking 5 ⁇ m particle size as an example, too fine (less than 2 ⁇ m) or too thick (more than 12 ⁇ m) powder The total is usually not more than 40%.
  • Cathode material lithium cobaltate, lithium manganate, lithium nickelate, or lithium nickel cobaltate
  • Preparation method of fine powder below 2 ⁇ m, coarser powder above 1 ⁇ m and 2 ⁇ m ⁇ 1 2 ⁇ The preparation method in the range of m is the same except that the solid-liquid ratio is different.
  • the solid-liquid ratio of fine powders below 2 ⁇ m should be increased by 20 from the original solid-liquid ratio. % ⁇ 50%, the solid-liquid ratio of coarser powders above 12 ⁇ m should be reduced by 10% ⁇ 30% based on the original solid-liquid ratio.
  • the anode material graphite is screened by 300 mesh vibration, and the remaining ones on the Internet are usually not suitable for use.
  • the conductive agent involved in the present invention includes graphite, acetylene black, carbon black, etc .; except that graphite is used as a negative electrode material for high-temperature treatment (300 to 500 ° °), the rest is baked. The material can be placed in a vacuum box for vacuum treatment without the need for high temperature treatment.
  • the production process of the lithium-ion power battery is as follows: ingredients- ⁇ coating- ⁇ tableting- ⁇ rolling-winding and assembling into the inner body (including casing and sealing)- ⁇ filling- ⁇ chemical conversion- ⁇ volumetric.
  • Coating also known as drawing pulp.
  • the stirred positive electrode (or negative electrode) slurry is hook-coated on the metal foil current collector, pulled out by a roller knife into the oven and dried. After baking, it will become semi-finished current collector after baking. Care must be taken during coating to avoid scratches, exposed substrates, lightness and weight in the vertical and horizontal directions.
  • the temperature control is very important: the temperature of the preheating section should not be too high, usually the temperature is selected at 90 ° C or below, and the temperature of the intermediate temperature section is between 1 10 ° C ⁇ 1 3 0 ° Between C, ⁇ 10 ° C, the temperature in the high-temperature section is 120. C ⁇ 1 4 0. Between C, ⁇ 10. C. Under the aforementioned temperature conditions, the temperature of the negative electrode slurry can be slightly higher than the temperature of the positive electrode slurry by about 10 to 15 "C during coating and baking, and the temperature of the slurry using water as the medium can be higher than that of NMP as the medium. The temperature of the slurry is slightly higher than about 10 ⁇ 15 ° C.
  • both the positive electrode and the negative electrode must enter the drying tunnel of the coating machine (also known as the puller) from the preheating section, and must not be inverted. If the slurry (especially the negative electrode slurry) first enters the high-temperature section of the coater and bakes suddenly at high temperature, the surface is dried quickly, and it is easy to form a dry shell, which is slightly wrinkled, which will form cracked fine lines. The slurry under the dry shell is sugar-smeared and forms a liquid film invisible to the naked eye between the metal foil.
  • the coating machine also known as the puller
  • the slurry is actually virtually attached to the surface of the metal foil, so it is easy to remove powder and even flakes ( (Ie, large pieces of active material fall off the metal foil), which seriously affects the electrical performance of lithium-ion power batteries.
  • Current coating The cloth process is mostly coated on one side and then coated on the other side; however, it can also be coated on both sides simultaneously.
  • the positive and negative electrode sheets to which the present invention is applied may be coated with active materials on both sides of the metal foil, or may be coated with active materials only on one side of the metal foil.
  • the back surface (metallic surface without active material coating) can be attached to form a current collector with active materials on both sides.
  • the thickness of the metal foil used for single-sided coating must be thinner than the thickness of the aforementioned metal foil, which is about 1/2 to 1/3 of the thickness of the aforementioned metal foil.
  • Line speed control in the coating process is also important. Under the above temperature conditions, the linear speed can be adjusted within the range of 800mm to 500 Omm per minute. The best linear speed is 1200mm ⁇ 3500mm per minute.
  • high-pressure spraying can also be used. Under a certain pressure of the dry protective gas, the slurry is sprayed evenly on the metal foil from the high-speed nozzle, which not only has better adhesion, but also significantly increases the production capacity.
  • the thickness of the positive electrode before rolling is about 170 ⁇ m to 270 ⁇ m
  • the thickness of the positive electrode after rolling is about 110 ⁇ m to 165 ⁇ m
  • the thickness of the negative electrode is about 185 ⁇ m to 275 ⁇ m, 110 ⁇ ⁇ ⁇ 165 ⁇ ⁇ after rolling.
  • the optimal thickness of the positive electrode before rolling is 195 ⁇ m ⁇ 235 ⁇ 01
  • the optimal thickness of the positive electrode after rolling is 135 ⁇ ⁇ 155 ⁇ m
  • the optimal thickness of the negative electrode before rolling is 220 ⁇ ⁇ 250 ⁇ ⁇
  • the optimal thickness after rolling is 135 ⁇ m ⁇ 155 ⁇ ⁇ .
  • the rolling pin of the inner body 7 of the shaped shell is a small cylindrical shaft as shown in FIG. 1A, and the rolling pin of the inner body of the square shell shown in FIG. 2A is a thin sheet with certain rigidity and elasticity.
  • the positive and negative electrodes When winding, the positive and negative electrodes must be staggered, and the distance between the positive electrode 1 3 and the first electrode of the negative electrode 12 must be reasonably calculated, so that the positive electrode tabs 11 on the wound inner body 7 happen to be neat and neat.
  • the parallel arrangement is parallel to one end of the inner body, and the negative electrode tab 10 happens to be neatly arranged parallel to the other end of the inner body.
  • the outermost layer of the inner body 7 may be either a negative electrode sheet or a positive electrode sheet.
  • the positive electrode pole 4 is connected to the positive electrode sheet 1 3, and the negative electrode pole 2 is connected to the negative electrode sheet 12.
  • the surface of the current collecting plywood in contact with the tabs is processed with raised spines. In general, the coverage of the current collector plywood should be larger than the large leaf tab.
  • the method of clamping is also divided into perforated clamps and two-sided clamps.
  • the integrated current collector ply is cut on a solid metal into several wire grooves that can be compressed and can be springed off.
  • the pole ears are inserted into the wire grooves of the current collector ply A or D and fastened with metal bolts 5.
  • the split-type current collecting plywood B or C is connected in series by a plurality of independent metal pieces through a series rod 2 Q, and the tabs are respectively clamped and fastened with metal bolts 5.
  • the integrated current collector plywood can be perforated or double-sided.
  • the split current collector plywood can also be perforated or double-sided. From efficiency As far as the effect is concerned, the efficiency and effect of the perforated clip are better than the two-sided clip.
  • the bolts In order to prevent the bolts connecting the pole ears and poles from loosening, the bolts need to be fixed with curing glue.
  • Inject fluid Before injection, the normal air in the inner cavity of the lithium ion power battery must be drawn out. Except for the moisture in the inner cavity, the inner cavity of the battery must be in a negative pressure state, and then an appropriate amount of electrolyte is injected from the safety valve port.
  • the injection volume of a lithium-ion power battery must be calculated based on its capacity. If the injection volume is too large, it will easily leak and cause the drum shell. If the injection volume is too small, it will easily cause the deterioration of the positive and negative electrode active materials.
  • the injection volume of lithium ion power battery is usually adjusted within the range of 0.1 5 Ah / g ⁇ 0.6 Ah / g; the optimal injection volume is 0.2 Ah / g ⁇ 0.3 5 Ah / g between.
  • the environmental control of the injection is very important, so the injection must be completed in the operation box or other environment that can meet the requirements. Because the pressure relief hole of the safety valve communicates with the liquid injection hole on the cover plate, the injection liquid is usually injected from the pressure relief hole of the safety valve; the liquid injection hole can also be processed on the housing or the cover plate separately.
  • the internal cavity of the lithium-ion power battery must be intentionally filled with solid substances or electrolyte. Depending on the capacity of the lithium-ion power battery, the cavity is about 1% to 10% of the total volume of the internal cavity.
  • the cavity can be filled with a protective gas.
  • Formation is the last key to battery production.
  • the formation principle of high-power lithium-ion batteries must be low current and low voltage. High current must not be formed. Higher voltage formation is required to fully activate the active materials on the positive and negative current collector substrates.
  • the formation process must be completed uninterrupted at one time, and it cannot be stopped or stopped at will.
  • the formation curve should be smoothly connected, and the current should be controlled between 0. 0 1 C / 10 hours- ⁇ 0. 2 C / 5 hours-— 0. 0 5 C / 5 hours- ⁇ 0. 1 C / 4 hours- ⁇ 0.2 C / 1 hour, after the constant current is full, it will be switched to constant pressure to continue charging, so as to ensure sufficient one time.
  • the lithium ion power battery manufactured by this method can not only meet the requirements of high-power charge and discharge, but also avoid the problem of heat accumulation inside the power battery.

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Abstract

Cette invention se rapporte à une batterie aux ions de lithium rechargeable, dont chaque élément d'accumulateur individuel est constitué par une plaque de revêtement, un pôle négatif, une valve de sécurité, un pôle positif, une solution d'électrolyte et un boîtier. Le pôle positif est connecté à l'électrode positive et le pôle négatif est connecté à l'électrode négative. Le substrat de l'électrode positive est choisi sous la forme d'une feuille d'aluminium d'une certaine épaisseur, recouverte d'un matériau actif positif sur les deux côtés. Le substrat de l'électrode négative est choisi sous la forme d'une feuille de cuivre d'une certaine épaisseur, recouverte d'un matériau actif négatif sur les deux côtés. Cette batterie se caractérise en ce que son corps intérieur est constitué par un ensemble électrode ayant une structure en forme de plaque composée d'une feuille d'électrode positive, d'une feuille d'électrode négative et d'un séparateur. La feuille d'électrode positive ou la feuille d'électrode négative est conçue sous la forme d'une longue feuille expansée avec une seule languette à grande feuille ou de multiples languettes à grande feuille ayant différents écoulements de courant d'espace jusqu'aux pôles, grâce à une pince collectrice de courant. L'électrode positive possède un ou plusieurs pôles d'électrode et l'électrode négative possède un ou plusieurs pôles d'électrode.
PCT/CN2003/000170 2002-03-08 2003-03-07 Batterie aux ions de lithium rechargeable et procede de fabrication correspondant WO2003077348A1 (fr)

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CNB021072094A CN1320682C (zh) 2002-03-08 2002-03-08 可反复充放电的锂离子动力电池及其制造方法
CN02107209.4 2002-03-08

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