WO2023165279A1 - 电芯、电池及电芯制造设备 - Google Patents

电芯、电池及电芯制造设备 Download PDF

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Publication number
WO2023165279A1
WO2023165279A1 PCT/CN2023/072043 CN2023072043W WO2023165279A1 WO 2023165279 A1 WO2023165279 A1 WO 2023165279A1 CN 2023072043 W CN2023072043 W CN 2023072043W WO 2023165279 A1 WO2023165279 A1 WO 2023165279A1
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WIPO (PCT)
Prior art keywords
pole piece
cathode
diaphragm
anode
unwinding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/072043
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English (en)
French (fr)
Inventor
赵留杰
王奉杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuxi Lead Intelligent Equipment Co Ltd
Original Assignee
Wuxi Lead Intelligent Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN202220442079.3U external-priority patent/CN218333856U/zh
Priority claimed from CN202220428844.6U external-priority patent/CN217740615U/zh
Application filed by Wuxi Lead Intelligent Equipment Co Ltd filed Critical Wuxi Lead Intelligent Equipment Co Ltd
Priority to EP23762680.9A priority Critical patent/EP4471928A1/en
Publication of WO2023165279A1 publication Critical patent/WO2023165279A1/zh
Priority to US18/817,967 priority patent/US20240421360A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H01M10/0409—Machines for assembling batteries for cells with wound electrodes
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • 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

  • the present application relates to the technical field of lithium batteries, in particular to a battery cell, battery and battery cell manufacturing equipment.
  • lithium battery As a rechargeable secondary battery, lithium battery has the advantages of small size, high energy density, many cycles and high stability, and has been widely used in automotive power batteries.
  • the battery cell of a lithium battery includes a cathode pole piece and an anode pole piece, which can also be called a positive pole piece and a negative pole piece respectively.
  • the positive electrode sheet is coated with a positive electrode active material layer such as lithium manganese oxide, lithium cobaltate, and lithium iron phosphate, while the negative electrode sheet is coated with a negative electrode active material layer such as graphite and silicon.
  • lithium ions When a lithium battery is charged, lithium ions are deintercalated from the positive electrode and intercalated into the negative electrode. However, when the lithium intercalation space of the negative electrode is insufficient or the speed of lithium ion deintercalation from the positive electrode is too fast, the deintercalated lithium ions will not be able to intercalate in the negative active material layer of the negative electrode in the same amount, and cannot be intercalated in the negative active material layer of the negative electrode. Lithium ions can only obtain electrons on the surface of the negative electrode sheet and form a silver-white metal lithium element, that is, the phenomenon of lithium precipitation occurs.
  • lithium analysis will adversely affect the charging efficiency, energy density and other parameters of lithium batteries.
  • lithium crystals can also be formed when lithium precipitation is severe, and lithium crystals may pierce the separator between the positive electrode and the negative electrode, resulting in a short circuit inside the battery and a serious safety hazard.
  • the present application provides a battery cell with a compact structure, and provides a battery and battery cell manufacturing equipment.
  • a battery cell comprising a cathode pole piece, an anode pole piece, and the adjacent cathode pole piece and the anode pole piece
  • the diaphragm between the pole pieces, the cathode pole piece, the anode pole piece and the diaphragm are wound and pressed to form a flat structure, and the battery core has a flat area and bends located at both ends of the flat area region, at least a portion of the cathode sheet located in the bending region is formed with fractures extending along the width direction.
  • the fracture slit divides the cathode pole piece where it is located into at least two pole piece segments, and at least two pole piece segments are connected to form a whole through a connecting piece.
  • the connecting member is an adhesive tape that is bonded to at least one side of the cathode sheet and covers the fracture.
  • a bending portion can be formed, and the cathode electrode piece is formed with a plurality of bending parts from the winding start end to the winding end part, and the breaking seam is formed on the first bending part from the winding start end to the winding end.
  • the breaking seams are formed on the first two or the first four or the first six of the bending parts from the winding start end to the winding end.
  • At least a part of the position of the anode sheet located in the bending region corresponding to the fracture seam is formed with a second fracture seam.
  • a battery includes a casing and the battery cell according to any one of the above preferred embodiments, the battery cell is housed in the casing and the casing is filled with electrolyte.
  • the cathode electrode sheet located in the bending area can be The number of deintercalated lithium ions will be significantly reduced.
  • the phenomenon of lithium precipitation generally occurs in the bending area of the battery, because the bending will cause the negative electrode active material layer on the anode electrode sheet to fall off, resulting in the reduction of lithium intercalation sites on the anode electrode sheet, which in turn leads to the deintercalation of lithium ions from the cathode electrode sheet. It cannot be embedded in the same amount of anode pole piece.
  • a cell manufacturing equipment comprising:
  • the first discharging device is used to provide cathode pole pieces
  • the pole piece processing device is capable of forming fractures and setting connectors in the predetermined area of the cathode pole piece, and the fracture seam divides the cathode pole piece where it is located into at least two pole piece segments, at least two of which are The pole piece segments are connected to form a whole through the connecting piece;
  • the second discharging device is used to provide the anode pole piece
  • a diaphragm discharging device used to arrange a diaphragm between the adjacent cathode pole pieces and the anode pole pieces;
  • the winding device includes a needle winding mechanism, and the needle winding mechanism can wind the anode pole piece, the cathode pole piece and the separator into an electric core;
  • the battery core can be pressed into a flat structure having a straight area and a bending area, and the predetermined area is located in the bending area.
  • the pole piece processing device includes:
  • At least two pinch mechanisms each of which is capable of clamping and transporting the cathode sheet
  • each of the cutting mechanisms can cut off the cathode pole piece to obtain at least two pole piece segments, and at least two of the pinching mechanisms Capable of clamping at least two pole piece segments respectively and pulling apart the distance between two adjacent pole piece segments to form the breaking seam;
  • the gluing mechanism is capable of adhering the adhesive tape as the connecting part on at least one side of the cathode pole piece and covering the fractured seam, so as to connect the at least two pole pieces in sections to form a whole.
  • a second pole piece processing device is further included, and the second pole piece processing device is used to form a second fracture seam in the area of the anode pole piece corresponding to the preset area.
  • the cell produced has a bending area and a straight area, and at least part of the The cathode pole piece in the bending area is formed with broken seams.
  • the above cell manufacturing equipment can realize the continuous preparation of cells with high efficiency.
  • a cell manufacturing equipment comprising:
  • the first unwinding device includes a cathode unwinding mechanism, a pole piece processing mechanism, a first diaphragm unwinding mechanism and a first composite mechanism
  • the cathode unwinding mechanism is used to provide cathode pole pieces
  • the pole piece treatment mechanism can be
  • the preset area of the cathode pole piece forms a break and connects, and the break break divides the cathode pole piece where it is located into at least two pole piece segments, and at least two of the pole piece segments pass through the
  • the connectors are connected to form an integral body
  • the first diaphragm unwinding mechanism is used to unwind the first diaphragm
  • the first composite mechanism can receive the cathode sheet and the first diaphragm and perform compounding to obtain the first Composite tape;
  • the second unwinding device includes an anode unwinding mechanism, a second diaphragm unwinding mechanism and a second composite mechanism, the anode unwinding mechanism is used to provide the anode pole piece, and the second diaphragm unwinding mechanism is used to unwind the second diaphragm unwinding mechanism Two diaphragms, the second compounding mechanism can receive the anode pole piece and the second diaphragm and perform compounding to obtain a second composite strip;
  • the winding device includes a needle winding mechanism, and the needle winding mechanism can wind the first composite material strip and the second composite material strip into an electric core;
  • the battery core can be pressed into a flat structure having a straight area and a bending area, and the predetermined area is located in the bending area.
  • the pole piece processing mechanism includes:
  • At least two pinch mechanisms each of which is capable of clamping and transporting the cathode sheet
  • each of the cutting mechanisms can cut off the cathode pole piece to obtain at least two pole piece segments, and at least two of the pinching mechanisms able to separate Clamping at least two of the pole piece segments and pulling apart the distance between two adjacent pole piece segments to form the break;
  • the gluing mechanism is capable of adhering the adhesive tape as the connecting part on at least one side of the cathode pole piece and covering the fractured seam, so as to connect the at least two pole pieces in sections to form a whole.
  • the battery cells produced by the above-mentioned cell manufacturing equipment can not only effectively suppress the occurrence of lithium precipitation.
  • the first diaphragm is combined with the cathode pole piece to form a first composite material strip
  • the second membrane is combined with the anode pole piece to form a second composite material strip.
  • a cell manufacturing equipment comprising:
  • the first discharge device is used to provide a first composite material belt, the first composite material belt includes a first diaphragm and a cathode electrode sheet covered on the first diaphragm;
  • a pole piece processing device capable of forming fractures on the cathode pole piece of the first composite strip
  • the second discharging device is used to provide a second composite material belt, and the second composite material belt includes a second diaphragm and an anode electrode piece covered on the second diaphragm;
  • the winding device includes a needle winding mechanism, and the needle winding mechanism can wind the first composite material strip and the second composite material strip into an electric core;
  • the battery core can be pressed into a flat structure with a straight area and a bent area, and the fracture seam is located in the bent area.
  • the first discharging device includes:
  • a cathode unwinding mechanism for unwinding the cathode pole piece
  • the first recombination mechanism can receive and recombine the cathode electrode piece and the first diaphragm, so as to obtain to the first composite strip.
  • the pole piece processing device includes a pinch mechanism and a cutting mechanism arranged between the cathode unwinding mechanism and the first composite mechanism, and the pinch mechanism can clamp and transport the The cathode electrode sheet, the cutting mechanism can cut off the cathode electrode sheet between the pinch mechanism and the first composite mechanism, and the pinch mechanism can pull apart the cut part and form the fracture crack .
  • the pole piece processing device also includes a glue sticking mechanism, and the glue sticking mechanism can stick a first adhesive tape on one side of the cathode pole piece, so as to place the The cathode sheet on one side of the pinch mechanism is bonded to the first diaphragm.
  • the gluing mechanism can also bond a second adhesive tape on one side of the cathode pole piece, so as to place the cathode pole piece on the side away from the pinching mechanism bonded to the first diaphragm.
  • the first composite mechanism includes an upper pressing roller and a lower pressing roller, and the cathode sheet and the first separator can pass between the upper pressing roller and the lower pressing roller.
  • the second discharging device includes:
  • an anode unwinding mechanism used for unwinding the anode pole piece
  • the second compounding mechanism is capable of receiving the anode pole piece and the second diaphragm and performing compounding to obtain the second composite strip.
  • it further includes a second pole piece processing device, the second pole piece processing device is used to form a first Two broken cracks.
  • the manufactured cell has a bending area and a straight area, and at least part of the cathode sheet located in the bending area is formed with fractures.
  • the phenomenon of lithium precipitation generally occurs in the bending area of the battery, because the bending will cause the negative electrode active material layer on the anode electrode sheet to fall off, resulting in the reduction of lithium intercalation sites on the anode electrode sheet, which in turn leads to the deintercalation of lithium ions from the cathode electrode sheet.
  • the battery cell manufactured by the above-mentioned battery cell forming equipment can effectively suppress the occurrence of lithium precipitation phenomenon.
  • Fig. 1 is a schematic cross-sectional view of the battery cell along the direction perpendicular to the winding axis in the first embodiment of the present application;
  • Fig. 2 is a schematic cross-sectional view of the battery cell along the direction perpendicular to the winding axis in the second embodiment of the present application;
  • Fig. 3 is a schematic diagram showing the expansion of a part of the cathode pole piece of the cell shown in Fig. 1 or Fig. 2 located in the bending area;
  • Fig. 4 is a schematic cross-sectional view of the battery cell along the direction perpendicular to the winding axis in the third embodiment of the present application;
  • Fig. 5 is a schematic diagram of the expansion of a part of the cathode pole piece of the battery shown in Fig. 4 located in the bending area;
  • FIG. 6 is a schematic structural diagram of the cell manufacturing equipment in the first embodiment of the present application.
  • Fig. 7 is a schematic structural view of the pole piece processing device in the cell manufacturing equipment shown in Fig. 6;
  • Fig. 8 is a schematic structural diagram of the cell manufacturing equipment in the second embodiment of the present application.
  • Fig. 9 is a schematic structural diagram of the pole piece processing mechanism in the cell manufacturing equipment shown in Fig. 8;
  • Fig. 10 is a schematic structural diagram of the cell manufacturing equipment in the third embodiment of the present application.
  • first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • the features defined as “first” and “second” may explicitly or implicitly include at least one of these features.
  • “plurality” means at least two, such as two, three, etc., unless otherwise specifically defined.
  • a first feature being “on” or “under” a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch.
  • the first feature being “on”, “over” and “over” the second feature can be the first feature.
  • the sign is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.
  • "Below”, “beneath” and “beneath” the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • the present application provides an electric cell, a battery and electric cell manufacturing equipment.
  • the above-mentioned battery includes a casing and the above-mentioned battery cell, the battery cell is accommodated in the casing and filled with electrolyte; the above-mentioned battery cell manufacturing equipment is used to prepare the above-mentioned battery cell.
  • the cell 100 in the first embodiment of the present application includes a cathode pole piece 110 , an anode pole piece 120 and a diaphragm 130 , and the diaphragm 130 is located between the adjacent cathode pole piece 110 and the anode pole piece 120 space, used to separate the cathode pole piece 110 from the anode pole piece 120 to avoid short circuit.
  • the cathode electrode piece 110 , the anode electrode piece 120 and the separator 130 are stacked first, and then wound and pressed to form a flat structure.
  • the relative positions of the cathode electrode piece 110 , the anode electrode piece 120 and the separator 130 may be different.
  • the cathode pole piece 110 and the anode pole piece 120 in the present embodiment are all one, and there are two diaphragms 130, one of which is lined at the bottom, and the cathode pole piece 110 is stacked on it, and another diaphragm 110 is arranged on the cathode pole piece 110.
  • One diaphragm 130 , and the anode electrode piece 120 is stacked on the second diaphragm 130 .
  • the battery cell 100 has a flat area 101 and bending areas 102 located at two ends of the straight area 101 .
  • the flat region 101 refers to a region with a parallel structure in the flat structure cell 100, that is, in the flat region 101
  • the cathode electrode piece 110 , the anode electrode piece 120 and the diaphragm 130 inside are in a state of being substantially parallel to each other, and the surfaces of each layer of the cathode electrode piece 110 , anode electrode piece 120 and the diaphragm 130 located in the flat region 101 are substantially planar.
  • the bending area 102 refers to the area with a bending structure in the flat structure of the cell 100, that is, the cathode electrode piece 110, the anode electrode piece 120 and the separator 130 in the bending area 102 are all bent, and each layer of the cathode electrode piece 110 , the surfaces of the anode pole piece 120 and the diaphragm 130 are all curved surfaces.
  • the cathode sheet 110 is coated with a positive active material layer formed of lithium manganate, lithium cobaltate, lithium iron phosphate, etc., while the anode sheet 120 is coated with a negative active material layer formed of graphite, silicon, etc.
  • the applicant has found through research that the active materials of the cathode electrode sheet 110 and the anode electrode sheet 120 located in the bending area 102 tend to fall off during the bending process, which is called "powder falling".
  • the shedding of the negative active material on the anode pole piece 120 will cause the lithium intercalation position of the negative pole active material layer of the anode pole piece 120 to be less than the amount of lithium ions that can be provided by the positive pole active material layer of its adjacent cathode pole piece 110 , which in turn causes the lithium ions deintercalated from the positive electrode active material layer to be unable to intercalate in the same amount in the negative electrode active material layer. Therefore, when the battery is being charged, lithium deposition generally occurs in the bending region 102 of the battery cell 100 .
  • the cathode electrode sheet 110 and the anode electrode sheet 120 in the flat area 101 do not need to be bent during the forming process of the battery cell 100, there is almost no "powder dropping", so the anode electrode sheet 120 in the flat area 101
  • the lithium intercalation sites of the negative electrode active material layer can keep a good match with the amount of lithium ions that can be provided by the positive electrode active material layer of the adjacent cathode electrode sheet 110 . Therefore, generally the flat region 101 of the battery cell 100 will not experience lithium deposition.
  • Lithium deposition will have a series of adverse effects on the battery cell 100 and the battery, so it is necessary to suppress the occurrence of lithium deposition in the battery cell 100 , especially in the bending region 102 .
  • At least part of the cathode pole piece 110 located in the bending region 102 is formed with a fracture slit 103 extending in the width direction, and the fracture seam 103 divides the cathode pole piece 110 where it is located into at least two pole piece segments (Fig. Not marked), at least two pole piece segments are connected to form a whole through the connecting piece 140 .
  • the fracture slit 103 can disconnect the cathode pole piece 110. Since there is no positive electrode active material layer and no lithium ions in the region corresponding to the fracture slit 103, the lithium ions that can be deintercalated on the cathode pole piece 110 located in the bending region 102 The number will be significantly reduced. Therefore, even if the adjacent anode electrode sheet 120 "powder falling" occurs during the bending process, the amount of lithium ions that can be deintercalated by the cathode electrode sheet 110 is also reduced, so the negative electrode of the anode electrode sheet 120 can also be avoided.
  • the lithium intercalation sites of the active material layer are far less than the amount of lithium ions that can be provided by the positive electrode active material layer of the adjacent cathode electrode sheet 110 , thereby reducing or avoiding the occurrence of lithium precipitation.
  • At least a portion of the anode sheet 120 located in the bending region 102 is formed at a position corresponding to the fracture slit 103 with a second fracture slit (not shown).
  • the existence of the second crack will reduce the content of the negative electrode active material on the anode sheet 120 located in the bending region 102 to a certain extent, thereby reducing the number of lithium intercalation sites.
  • this part of the reduced negative electrode active material will generally fall off from the surface of the anode sheet 120 when it is bent.
  • the existence of the second fracture seam can reduce the resistance when the anode pole piece 120 is bent, and can avoid “powder dropping” in parts other than the second fracture seam to a certain extent. That is to say, the loss of the negative electrode active material caused by the second fracture is actually reduced compared with the conventional situation. Therefore, the setting of the second fracture crack can also suppress the occurrence of lithium precipitation phenomenon to a certain extent.
  • the connector 140 is an insulating part, which can connect at least two divided pole pieces to form a whole, thereby avoiding the displacement of the cathode pole piece 110 during the winding process, and helping to improve the stability and reliability of the battery cell 100 .
  • the connecting member 140 is an adhesive tape that is bonded to at least one side of the cathode sheet 110 and covers the fracture slit 103 .
  • the adhesive tape can be connected with two adjacent pole piece segments, so that the two pole piece segments are connected to form a whole.
  • the adhesive tape can be bonded to one side of the cathode electrode sheet 110 , and can also be bonded to opposite sides of the cathode electrode sheet 110 .
  • both sides of the cathode electrode piece 110 are bonded with tapes.
  • the number of tapes generally corresponds to the number of breaks 103 , for example, if two breaks 103 are formed on the cathode sheet 110 , four tapes need to be provided.
  • each adhesive tape is attached along the extending direction of the fracture 103 , that is, the width direction of the cathode sheet 110 .
  • a bending portion (not shown) can be formed every time the cathode sheet 110 passes through the bending region 102 once, and the cathode sheet 110 is formed with multiple bending portions from the winding start end to the winding end.
  • the winding starting end refers to the end where winding begins, and is generally located at the center of the battery cell 100 , and the winding end is located at the outside of the battery cell 100 .
  • each layer of cathode sheet 110 located in the bending area 102, that is, each bending portion forms a fracture crack 103, which can avoid the occurrence of lithium precipitation to the greatest extent, but this will make the forming process of the battery cell 100 complicated. , the manufacturing cost rises.
  • the fracture slit 103 is formed on the first bending portion of the cathode sheet 110 from the winding start end to the winding end.
  • the above-mentioned first bending part is located at one end of the battery cell 100 (the left end shown in FIG. 1 ), and refers to the layer of cathode tab 110 located at the bending area 102 and closest to the center of the battery cell 100 .
  • the pole piece closer to the center of the battery cell 100 is more bent, so the shedding of the active material is the most serious, and the phenomenon of lithium precipitation is also the most obvious.
  • the number of pole piece segments is determined by the number of breaks 103 .
  • one fracture slit 103 can be divided into two pole piece segments, two fracture slits 103 can be divided into three pole piece segments, and so on.
  • the cathode pole piece 110 is bent multiple times in the bending area 102, the first two or the first four or the first six bending parts of the cathode pole piece 110 from the winding start end to the winding end are all bent. Fracture cracks 103 are formed.
  • the specific number of breaks 103 can be adjusted according to the bending times of the cathode sheet 110 .
  • the first two bending parts of the cathode electrode sheet 110 are formed with fracture cracks 103, in the bending area 102 at the left and right ends of the battery cell 100, the first layer of cathode electrode sheet 110 is formed with fracture cracks 103 from the inside to the outside.
  • the cathode electrode piece 110 located in the bending region 102 has fracture cracks 103, and the area corresponding to the fracture cracks 103 does not have a positive electrode active material layer, and there is no lithium ion, so the area located in the bending region 102 The number of lithium ions that can be deintercalated on the cathode pole piece 110 will be significantly reduced.
  • the phenomenon of lithium deposition generally occurs in the bending area 102 of the battery cell 100, because bending will cause the negative electrode active material layer on the anode electrode sheet 120 to fall off, resulting in a decrease in the lithium intercalation site on the anode electrode sheet 120, which in turn leads to the loss of lithium from the cathode electrode sheet.
  • Lithium ions deintercalated on the sheet 110 cannot be embedded in the anode sheet 120 in the same amount.
  • the number of lithium ions that can be deintercalated on the cathode sheet 110 located in the bending region 102 of the battery cell 100 is also significantly reduced, the number of lithium ions that can obtain electrons and form lithium elements will also be significantly reduced. Therefore, the above-mentioned battery cell 100 can effectively suppress lithium precipitation phenomenon.
  • the cell 100 in the third embodiment of the present application includes a cathode pole piece 110 , an anode pole piece 120 and a diaphragm 130 , and the diaphragm 130 is located between the adjacent cathode pole piece 110 and the anode pole piece 120 space, used to separate the cathode pole piece 110 from the anode pole piece 120 to avoid short circuit.
  • the cathode electrode piece 110 , the anode electrode piece 120 and the diaphragm 130 are laminated to each other, and then rolled and pressed to form a flat structure.
  • the battery cell 100 has a flat area 101 and bending areas 102 located at two ends of the straight area 101 .
  • the flat region 101 refers to a region with a parallel structure in the flat structure cell 100, that is, in the flat region 101
  • the cathode electrode piece 110 , the anode electrode piece 120 and the diaphragm 130 inside are in a state of being substantially parallel to each other, and the surfaces of each layer of the cathode electrode piece 110 , anode electrode piece 120 and the diaphragm 130 located in the flat region 101 are substantially planar.
  • the bending area 102 refers to the area with a bending structure in the flat structure of the cell 100, that is, the cathode electrode piece 110, the anode electrode piece 120 and the separator 130 in the bending area 102 are all bent, and each layer of the cathode electrode piece 110 , the surfaces of the anode pole piece 120 and the diaphragm 130 are all curved surfaces.
  • the cathode sheet 110 is coated with a positive active material layer formed of lithium manganate, lithium cobaltate, lithium iron phosphate, etc., while the anode sheet 120 is coated with a negative active material layer formed of graphite, silicon, etc.
  • the applicant has found through research that the active materials of the cathode electrode sheet 110 and the anode electrode sheet 120 located in the bending area 102 tend to fall off during the bending process, which is called "powder falling".
  • the shedding of the negative active material on the anode pole piece 120 will cause the lithium intercalation position of the negative pole active material layer of the anode pole piece 120 to be less than the amount of lithium ions that can be provided by the positive pole active material layer of its adjacent cathode pole piece 110 , which in turn causes the lithium ions deintercalated from the positive electrode active material layer to be unable to intercalate in the same amount in the negative electrode active material layer. Therefore, when the battery is being charged, lithium deposition generally occurs in the bending region 102 of the battery cell 100 .
  • the cathode electrode sheet 110 and the anode electrode sheet 120 in the flat area 101 do not need to be bent during the forming process of the battery cell 100, there is almost no "powder dropping", so the anode electrode sheet 120 in the flat area 101
  • the lithium intercalation sites of the negative electrode active material layer can keep a good match with the amount of lithium ions that can be provided by the positive electrode active material layer of the adjacent cathode electrode sheet 110 . Therefore, generally the flat region 101 of the battery cell 100 will not experience lithium deposition.
  • Lithium deposition will have a series of adverse effects on the battery cell 100 and the battery, so it is necessary to suppress the occurrence of lithium deposition in the battery cell 100 , especially in the bending region 102 .
  • at least part of the cathode tab 110 located in the bending region 102 is formed with a fracture slit 103 extending along the width direction.
  • the difference of the electric core 100 in the third embodiment includes: no connecting piece 140 is provided to separate the pole pieces on both sides of the fracture slit 103 Segment connection into one.
  • the amount of lithium ions that can be deintercalated on the cathode sheet 110 located in the bending area 102 will be significantly reduced. Therefore, even if the adjacent anode electrode sheet 120 "powder falling" occurs during the bending process, the amount of lithium ions that can be deintercalated by the cathode electrode sheet 110 is also reduced, so the negative electrode of the anode electrode sheet 120 can also be avoided.
  • the lithium intercalation sites of the active material layer are far less than the amount of lithium ions that can be provided by the positive electrode active material layer of the adjacent cathode electrode sheet 110 , thereby reducing or avoiding the occurrence of lithium precipitation.
  • the fracture 103 can divide the cathode pole piece 110 into two pole piece segments.
  • a first tape 150 is bonded to one side of the cathode pole piece 110, and the first tape 150 can divide the pole piece into two sections. Adhesive to the separator 130, so as to prevent the cathode electrode piece 110 from being separated from the separator 130 during the winding process.
  • At least a portion of the anode sheet 120 located in the bending region 102 is formed at a position corresponding to the fracture slit 103 with a second fracture slit (not shown).
  • the existence of the second crack will reduce the content of the negative electrode active material on the anode sheet 120 located in the bending region 102 to a certain extent, thereby reducing the number of lithium intercalation sites.
  • this part of the reduced negative electrode active material will generally fall off from the surface of the anode sheet 120 when it is bent.
  • the existence of the second fracture seam can reduce the resistance when the anode pole piece 120 is bent, and can avoid “powder dropping” in parts other than the second fracture seam to a certain extent. That is to say, the loss of the negative electrode active material caused by the second fracture is actually reduced compared with the conventional situation. Therefore, the setting of the second fracture crack can also suppress the occurrence of lithium precipitation phenomenon to a certain extent.
  • the cathode electrode piece 110 located in the bending region 102 has fracture cracks 103, and the area corresponding to the fracture cracks 103 does not have a positive electrode active material layer, and there is no lithium ion, so the area located in the bending region 102 The number of lithium ions that can be deintercalated on the cathode pole piece 110 will be significantly reduced.
  • the phenomenon of lithium deposition generally occurs in the bending area 102 of the battery cell 100, because bending will cause the negative electrode active material layer on the anode electrode sheet 120 to fall off, resulting in a decrease in the lithium intercalation site on the anode electrode sheet 120, which in turn leads to the loss of lithium from the cathode electrode sheet.
  • Lithium ions deintercalated on the sheet 110 cannot be embedded in the anode sheet 120 in the same amount.
  • the number of lithium ions that can be deintercalated on the cathode sheet 110 located in the bending region 102 of the battery cell 100 is also significantly reduced, the number of lithium ions that can obtain electrons and form lithium elements will also be significantly reduced. Therefore, the above-mentioned battery cell 100 can effectively suppress lithium precipitation phenomenon.
  • the cell manufacturing equipment 200 in the first embodiment of the present application includes a first discharging device 210, a pole piece processing device 220, a second discharging device 230, a diaphragm discharging device 240 and a coil Around the device 250.
  • the cell manufacturing equipment 200 in the first embodiment can be used to prepare the cell 100 shown in FIG. 1 to FIG. 3 .
  • the first discharge device 210 is used to provide the cathode electrode sheet 110; the second discharge device 230 is used to provide the anode electrode sheet 120; the diaphragm discharge device 240 is used for between the adjacent cathode electrode sheet 110 and the anode electrode sheet 120 A diaphragm 130 is provided.
  • the quantity of the first discharging device 210 , the second discharging device 230 and the diaphragm discharging device 240 is determined according to the structure of the battery cell 100 to be processed. Specifically, in this embodiment, there is one cathode pole piece 110 and one anode pole piece 120 , and two diaphragms 130 . Therefore, one first discharge device 210 and one second discharge device 230 are respectively provided, while two diaphragm discharge devices 240 are provided.
  • the first unwinding device 210 , the second unwinding device 230 and the diaphragm unwinding device 240 can all be in the form of unwinding shafts, so as to realize the continuous unwinding of the cathode electrode sheet 110 , the anode electrode sheet 120 and the diaphragm 130 .
  • the winding device 250 includes a needle winding mechanism 251 .
  • the needle winding mechanism 251 can wind the anode pole piece 120 , the cathode pole piece 110 and the separator 130 to form the cell 100 .
  • the battery core 100 obtained by winding is roughly cylindrical or Oval in shape, a flat structure can be obtained after pressing.
  • the flat cell 100 has a flat area 101 and a bent area 102 . Wherein, the specific structure of the battery cell 100 and the definition of the straight region 101 and the bending region 102 have been described in detail above, so details are not repeated here.
  • the winding device 250 also includes a turntable 252, and a plurality of needle winding mechanisms 251 are arranged on the turntable 252.
  • the rotation of the turntable 252 can drive a plurality of needle winding mechanisms 251 to transfer to the anode electrode piece 120, the cathode electrode piece, etc. 110 and the position of the diaphragm 130.
  • the turntable 252 can be connected with a driving mechanism such as a motor, and can rotate at a certain angle each time driven by the driving mechanism. After the previous electric core 100 is wound, the turntable 252 rotates and the next needle winding mechanism 251 is rotated to the winding station (that is, the position where the anode pole piece 120, the cathode pole piece 110 and the diaphragm 130 can be obtained); then , the next needle winding mechanism 251 stretches out and obtains the anode pole piece 120, the cathode pole piece 110 and the diaphragm 130; after the previous electric core 100 is cut off from the end of the strip, the next needle winding mechanism 251 can be wound to Proceed to the preparation of the next battery cell 100 .
  • a plurality of needle winding mechanisms 251 can alternately enter the winding station and perform cell winding, so that the production cycle can be improved to reduce waiting time, thereby improving production efficiency.
  • the pole piece processing device 220 can form a fracture 103 in a predetermined area of the cathode pole piece 110 and set a connecting piece 140, and the fracture seam 103 divides the cathode pole piece 110 where it is located into at least two pole piece segments, at least two The pole piece segments are connected to form a whole through the connecting piece 140 .
  • the predetermined area of the cathode sheet 110 is located in the bending area 102 . That is to say, in the manufactured battery cell 100 , at least part of the cathode tab 110 located in the bending region 102 has a fracture slit 103 . As mentioned above, since there is no positive electrode active material layer and no lithium ions in the area corresponding to the fracture crack 103 , the number of lithium ions that can be deintercalated on the cathode sheet 110 located in the bending area 102 will be significantly reduced. Therefore, the battery cell 100 manufactured by the battery cell manufacturing equipment 200 can reduce or avoid occurrence of lithium phenomenon.
  • the cell manufacturing equipment 200 further includes a second pole piece processing device (not shown in the figure), and the second pole piece processing device is used to form a second break in the area of the anode pole piece 120 corresponding to the preset area. crack.
  • the structure of the second pole piece processing device may be exactly the same as that of the pole piece processing device 220 .
  • the “powder dropping” of the negative electrode active material can be effectively avoided, which is beneficial to improve the quality of the battery cell 100 .
  • the setting of the second fracture crack can also suppress the occurrence of lithium precipitation phenomenon to a certain extent.
  • the connecting piece 140 is an insulating part, which can connect at least two divided pole pieces to form a whole, so as to avoid displacement of the cathode pole pieces 110 during the winding process.
  • the connecting member 140 is an adhesive tape that is bonded to at least one side of the cathode sheet 110 and covers the fracture slit 103 .
  • the pole piece processing device 220 includes a pinch mechanism 221 , a cutting mechanism 222 and a glue-applying mechanism 223 .
  • each pinching mechanism 221 can pinch and transport the cathode electrode piece 110 .
  • the cutting mechanism 222 is arranged between two adjacent pinching mechanisms 221 , and each cutting mechanism 222 can cut off the cathode pole piece 110 to obtain at least two pole piece segments.
  • At least two pole piece segments can be clamped by different clamping mechanisms 221 and transported along the transporting direction.
  • at least two pinching mechanisms 221 can drive the clamped pole piece segments to be transported for different distances along the conveying direction, so that the fracture crack 103 is formed between two adjacent pole piece segments.
  • different clamping mechanisms 221 can form a speed difference, so that the distances between the clamped pole piece segments can be separated, so as to form the breaking seam 103 .
  • the cutting mechanism 222 can also punch the cathode electrode piece 110 in the manner of the cooperation of the punch and the die, and can cut off the waste material with a certain width on the cathode electrode piece 110, so that the When the cathode sheet 110 is cut off, the fracture crack 103 can be naturally formed. In this way, each pinch mechanism 221 can maintain a constant speed, and there is no need to divide the distance between the pole pieces by the pinch mechanism 221. pull away.
  • the cathode pole piece 110 is processed by the pole piece processing device 200, two fractures 103 can be formed on the cathode pole piece 110 and three pole piece segments can be obtained, and each pole piece segment is clamped by a clamping mechanism 221 .
  • the glue-applying mechanism 223 can paste the adhesive tape as the connector 140 on at least one side of the cathode pole piece 110 and cover the fracture slit 103, so as to connect at least two pole pieces into one body.
  • the gluing mechanism 223 is also arranged between two adjacent pinching mechanisms 221 , and the gluing mechanism 223 and the cutting mechanism 222 exist in pairs. More specifically, the gluing mechanism 223 is located at the downstream end of the cutting mechanism 222 paired with it.
  • the glue sticking mechanism 223 sticks tapes on both sides of the cathode electrode piece 110 to improve reliability.
  • pole piece processing device 220 The working process of the pole piece processing device 220 is described below in conjunction with the accompanying drawings:
  • the three pinch mechanisms 221 from the upstream end to the downstream end (from bottom to top in FIG. 7 ) of the conveying direction of the cathode electrode sheet 110 are referred to as the first, second, and third pinch mechanisms, respectively.
  • the two cutting mechanisms 222 are respectively called the first and the second cutting mechanism 222
  • the two gluing mechanisms 223 are respectively called the first and the second gluing mechanism 223
  • the obtained three pole piece segments Respectively referred to as the first, second and third pole segment;
  • the first cutting mechanism 222 in the pole piece conveying direction cuts off the cathode pole piece 110 between the first pinch mechanism 221 and the second pinch mechanism 221, And the second cutting mechanism 222 cuts off the cathode pole piece 100 between the second pinching mechanism 221 and the third pinching mechanism 221 to obtain three pole piece segments; the first pinching mechanism 221, the second The first pinch mechanism 221 and the third pinch mechanism 221 respectively clamp three pole piece segments and transport them downstream.
  • the delivery speed of the first pinch mechanism 221 is less than the delivery speed of the second pinch mechanism 221
  • the second The delivery speed of the first pinch mechanism 221 is less than the delivery speed of the third pinch mechanism 221.
  • the first pole piece segment moves downstream less than the second pole piece segment, and the second pole piece segment moves downstream less than the third pole piece segment.
  • the distance to move downstream In this way, the distances between the three pole piece segments are pulled apart, forming two fracture cracks 103 .
  • the two gluing mechanisms 223 paste adhesive tapes on both sides of the two fracture slits 103 respectively. Specifically, the first glue-applying mechanism 223 sticks tape to bond the first pole piece segment to the second pole piece segment, while the second glue-sticking mechanism 223 sticks tape to bond the second pole piece segment Bond with the third pole piece segment, thus connecting the three pole piece segments into one.
  • the pole piece processing device 220 can form more fractures 103 on the cathode pole piece 110 .
  • a plurality of cathode pole pieces 110 located in the bending region 102 can have fracture cracks 103, thereby further suppressing the occurrence of lithium precipitation.
  • the quantity of the pinching mechanism 221, the cutting mechanism 222 and the gluing mechanism 223 can be increased, so that the quantity of the cutting mechanism 222 and the gluing mechanism 223 is the same as that required to be formed. It is sufficient that the number of fracture cracks 103 is the same.
  • each pinch mechanism 221 includes pinch rollers, and the rotation speed of the pinch rollers of each pinch mechanism 221 can be adjusted individually. By adjusting the rotation speed of the pinch rollers, the conveying speed of each pinch mechanism 221 can be adjusted. In this way, a speed difference can be formed between different clamping mechanisms 221 , so that the distances between the clamped pole piece segments are separated to form the fracture seam 103 .
  • the speed adjustment of the nip roller is more convenient, and the space occupied by the nip roller is smaller, which is beneficial to make the structure of the pinch mechanism 221 more compact.
  • the purpose of extending the distance between the clamped pole piece segments can also be achieved by controlling the start and stop timing of the pinch rollers of the pinch mechanism 221 .
  • the clamping mechanism 221 can also realize the clamping and conveying of the cathode electrode piece 110 through the reciprocating movement of the clamping plate, and control the moving speed of the clamping plate and the start and stop timing to achieve the respective The purpose of pulling apart the distance between the clamped pole pieces.
  • the cell manufacturing equipment 200 also includes a pole piece feeding device 260, and the pole piece feeding device 260 is used to make the cathode pole piece 110 and the anode pole piece 120 are inserted into the needle rolling mechanism 251 .
  • a pinch roller can be provided in the pole piece feeding device 260 , and the pole piece can be inserted into the corresponding needle winding mechanism 251 by clamping and driving the pole piece by the pinch roller.
  • the quantity of the pole piece feeding device 260 is consistent with the quantity of the pole piece, for example, the cathode pole piece 110 and the anode pole piece 120 in the present embodiment are all one, then the pole piece feeding device 260 is provided with two, respectively for Feeding of the cathode electrode sheet 110 and the anode electrode sheet 120.
  • the cell 100 manufactured by the above-mentioned cell manufacturing equipment 200 has a bending area 102 and a straight area 101 , and at least part of the cathode sheet 110 located in the bending area 102 is formed with a fracture slit 103 .
  • There is no positive electrode active material layer and no lithium ions in the region corresponding to the fracture crack 103 so the number of lithium ions that can be deintercalated on the cathode sheet 110 located in the bending region 102 will be significantly reduced. Therefore, the prepared battery cell 100 can effectively suppress lithium precipitation phenomenon.
  • the above battery cell manufacturing equipment 200 can realize the continuous production of the battery cells 100 with high efficiency.
  • the cell manufacturing equipment 300 in the second embodiment of the present application includes a first discharging device 310 , a second discharging device 320 and a winding device 330 .
  • the cell manufacturing equipment 300 in the second embodiment can also be used to prepare the cell 100 shown in FIG. 1 to FIG. 3 .
  • the first unwinding device 310 includes a cathode unwinding mechanism 311 , a pole piece processing mechanism 312 , a first diaphragm unwinding mechanism 313 and a first composite mechanism 314 .
  • the cathode unwinding mechanism 311 is used to provide the cathode pole piece 110
  • the first diaphragm unwinding mechanism 313 is used to unwind the first diaphragm 131
  • the first composite mechanism 314 can receive the cathode pole piece 110 and the first diaphragm 131 and perform compounding. , to obtain the first composite strip 10.
  • the first composite mechanism 314 includes an upper pressing roller (not marked in the figure) and a lower pressing roller (not marked in the figure), and the cathode electrode piece 110 and the first diaphragm 131 can pass through the upper pressing roller and the lower pressing roller between.
  • Both the upper pressure roller and the lower pressure roller can rotate around their own axes, and one of them is connected with the drive assembly, Able to rotate actively.
  • the upper pressing roller and the lower pressing roller cooperate to clamp the cathode electrode sheet 110 and the first diaphragm 131 .
  • the cathode electrode piece 110 and the first diaphragm 131 are pressed and formed to obtain the first composite strip 10 .
  • the upper pressing roller and the lower pressing roller may be hot pressing rollers, so that the first composite material strip 10 is formed by hot pressing.
  • the first composite strip 10 can also be formed by cold pressing.
  • the second unwinding device 320 includes an anode unwinding mechanism 321 , a second diaphragm unwinding mechanism 322 and a second composite mechanism 323 .
  • the anode unwinding mechanism 321 is used to provide the anode pole piece 120
  • the second diaphragm unwinding mechanism 322 is used to unwind the second diaphragm 132
  • the second composite mechanism 323 can receive the anode pole piece 120 and the second diaphragm 132 and perform composite , to obtain the second composite strip 20.
  • the structure of the second composite mechanism 323 can be completely the same as that of the first composite mechanism 314 , so it will not be repeated here.
  • the structure of the second diaphragm unwinding mechanism 322 can be exactly the same as that of the first diaphragm unwinding mechanism 313.
  • Diaphragm 130 the diaphragms in the first composite material tape 10 and the second composite material tape 20 are respectively referred to as the first diaphragm 131 and the second diaphragm 132 .
  • the first diaphragm 131 and the second diaphragm 132 are insulating films, which can prevent short circuits.
  • the first discharging device 310 also includes a pole piece processing mechanism 312.
  • the pole piece processing mechanism 312 can form a fracture slit 103 in a predetermined area of the cathode pole piece 110 and set a connecting piece 140.
  • the fracture slit 103 will place the cathode pole piece 110 is divided into at least two pole piece segments, and at least two pole piece segments are connected by a connecting piece 140 to form a whole. That is to say, after the fracture 103 is formed on the cathode sheet 110 , the two sides of the fracture 103 are connected by the connecting piece 140 , so that the cathode sheet 110 and the first diaphragm 131 can be recombined smoothly.
  • fractures 103 are formed in predetermined regions of the cathode sheet 110 .
  • the winding device 330 includes a needle winding mechanism 331, and the needle winding mechanism 331 can take the first composite material strip 10 and The second composite material tape 20 is wound into the battery core 100 .
  • the battery core 100 obtained by winding is approximately cylindrical or elliptical, and can be flattened after being pressed.
  • the flat cell 100 has a flat area 101 and a bent area 102 . Wherein, the predetermined area on the cathode sheet 110 is located in the bending area 102 .
  • the specific structure of the battery cell 100 and the definition of the straight region 101 and the bending region 102 have been described in detail above, so details will not be repeated here.
  • the battery cell 100 manufactured by the battery cell manufacturing equipment 300 can also reduce or avoid the occurrence of lithium precipitation.
  • the structure of the pole piece processing mechanism 312 is the same as that of the pole piece processing device 220 of the cell manufacturing equipment 200 in the first embodiment. Please refer to FIG. 9 for details.
  • the pole piece processing mechanism 312 includes a pinching mechanism 3121, a cutting mechanism 3122, and a gluing mechanism 3123.
  • each pinching mechanism 3121 can pinch and transport the cathode electrode piece 110 .
  • the cutting mechanism 3122 is arranged between two adjacent pinching mechanisms 3121 , and each cutting mechanism 3122 can cut off the cathode pole piece 110 to obtain at least two pole piece segments.
  • At least two pole piece segments can be clamped by different clamping mechanisms 3121 and transported along the transporting direction.
  • at least two clamping mechanisms 3121 can drive the clamped pole piece segments to be transported for different distances along the conveying direction, so that a fracture crack 103 is formed between two adjacent pole piece segments.
  • different clamping mechanisms 3121 can form a speed difference, so that the distances between the clamped pole piece segments can be separated, so as to form the breaking seam 103 .
  • the cathode pole piece 110 is processed by the pole piece processing device 200, two fractures 103 can be formed on the cathode pole piece 110 and three pole piece segments can be obtained, and each pole piece segment is clamped by a clamping mechanism 3121 .
  • the glue-applying mechanism 3123 can paste the adhesive tape as the connector 140 on at least one side of the cathode pole piece 110 and cover the fracture slit 103, so as to connect at least two pole pieces into one piece.
  • Gluing mechanism is the same as 3123 It is arranged between two adjacent pinching mechanisms 3121, and the gluing mechanism 3123 and the cutting mechanism 3122 exist in pairs. More specifically, the gluing mechanism 3123 is located at the downstream end of the paired cutting mechanism 3122 .
  • the glue sticking mechanism 3123 sticks tapes on both sides of the cathode electrode piece 110 to improve reliability.
  • the cathode unwinding mechanism 311, the anode unwinding mechanism 321, the first diaphragm unwinding mechanism 313 (the second diaphragm unwinding mechanism 322) and the winding device 330 in the above-mentioned cell manufacturing equipment 300 are respectively the same as those of the first embodiment.
  • the structures of the first discharging device 210 , the second discharging device 220 , the separator discharging device 240 and the winding device 250 in the cell manufacturing equipment 200 are the same, so they will not be repeated here.
  • the battery cell 100 produced by the above cell manufacturing equipment 300 can not only effectively suppress the occurrence of lithium precipitation. Moreover, before winding, the first separator 131 is combined with the cathode electrode sheet 110 to form the first composite material strip 10 , and the second separator 132 is combined with the anode electrode sheet 120 to form the second composite material belt 20 . In this way, the number of material strips entering the winding device 330 can be reduced, thereby avoiding fluctuations in the relative positions of the pole piece and the separator during the winding process, and ensuring that the film layers in the manufactured battery core 100 have a high degree of alignment And it is not easy to dislocate, and it is convenient to control the tension to facilitate the speed of the equipment.
  • the cell manufacturing equipment 400 in the third embodiment of the present application includes a first discharging device 410 , a pole piece processing device 420 , a second discharging device 430 and a winding device 440 .
  • the cell manufacturing equipment 400 in the third embodiment can manufacture the cell 100 shown in FIG. 4 .
  • the first discharging device 410 is used to provide the first composite material strip 10 , and the first composite material belt 10 includes the first diaphragm 131 and the cathode electrode piece 110 covered on the first diaphragm 131 .
  • the second discharging device 430 is used to provide the second composite material belt 20 , and the second composite material belt 20 includes the second diaphragm 132 and the anode electrode piece 120 covering the second diaphragm 132 .
  • the first diaphragm 131 and the second diaphragm 132 both refer to the diaphragm 130 in the cell 100 shown in FIG. 4 .
  • the diaphragms in the first composite material tape 10 and the second composite material tape 20 are respectively referred to as the first diaphragm 131 and the second diaphragm 132 .
  • the first diaphragm 131 and the second diaphragm 132 are insulating films, which can enough to prevent short circuits.
  • the first unwinding device 410 includes a cathode unwinding mechanism 411 , a first diaphragm unwinding mechanism 4412 and a first composite mechanism 413 .
  • the cathode unwinding mechanism 411 is used for unwinding the cathode electrode piece 110 ; the first separator unwinding mechanism 4412 is used for unwinding the first separator 131 .
  • Both the cathode unwinding mechanism 411 and the first diaphragm unwinding mechanism 4412 can be in the form of an unwinding shaft, and the cathode pole piece 110 and the first diaphragm 131 can be wound on the cathode unwinding mechanism 411 and the first diaphragm unwinding mechanism respectively in the form of material tape.
  • the first composite mechanism 413 can receive the cathode electrode piece 110 and the first diaphragm 131 and perform composite to obtain the first composite strip 10 .
  • the first composite mechanism 413 includes an upper pressing roller (not marked in the figure) and a lower pressing roller (not marked in the figure), and the cathode electrode piece 110 and the first diaphragm 131 can pass through the upper pressing roller and the lower pressing roller between.
  • Both the upper pressing roller and the lower pressing roller can rotate around their own axes, and one of them is connected with the drive assembly and can actively rotate.
  • the upper pressing roller and the lower pressing roller cooperate to clamp the cathode electrode sheet 110 and the first diaphragm 131 .
  • the cathode electrode piece 110 and the first diaphragm 131 are pressed and formed to obtain the first composite material strip 10, and the obtained first composite material strip 10 can be formed in the first composite mechanism 413.
  • both the upper pressing roller and the lower pressing roller can be hot pressing rollers, so that the first composite strip 10 can be formed by hot pressing.
  • the first composite strip 10 can also be formed by cold pressing.
  • the first composite material tape 10 can be prepared in real time during the continuous unwinding of the cathode electrode sheet 110 and the first separator 131 , which helps to improve efficiency. It should be pointed out that, in other embodiments, the first composite tape 10 can also be prepared in advance and be unwound directly by the first unwinding device 410 when needed.
  • the second unwinding device 430 includes an anode unwinding mechanism 431, a second diaphragm unwinding machine structure 432 and the second compound mechanism 433.
  • the anode unwinding mechanism 431 is used for unwinding the anode pole piece 120
  • the second diaphragm unwinding mechanism 432 is used for unwinding the second diaphragm 132
  • the second composite mechanism 433 can receive the anode pole piece 120 and the second diaphragm 132 and carry out Composite to obtain the second composite strip 20.
  • the structures of the anode unwinding mechanism 431, the second diaphragm unwinding mechanism 432 and the second composite mechanism 433 can be completely the same as the cathode unwinding mechanism 411, the first diaphragm unwinding mechanism 4412 and the first composite mechanism 413 respectively, so they will not be described here. Let me repeat.
  • the pole piece processing device 420 can form a fracture 103 on the cathode pole piece 110 of the first composite strip 10 (see FIG. 5 ).
  • the fracture slit 103 extends along the width direction of the cathode tab 110 and can break the cathode tab 110 . It can be seen that there is no positive electrode active material in the region where the fracture crack 103 is located.
  • the winding device 440 includes a needle winding mechanism 441 .
  • the needle winding mechanism 441 can wind the first composite material tape 10 and the second composite material tape 20 into the battery cell 100 .
  • the battery core 100 obtained by winding is approximately cylindrical or elliptical, and can be flattened after being pressed.
  • the flat cell 100 has a flat area 101 and a bent area 102 .
  • the specific structure of the battery cell 100 and the definition of the straight region 101 and the bending region 102 have been described in detail above, so details are not repeated here.
  • the winding device 440 further includes a turntable 442, and a plurality of needle winding mechanisms 441 are arranged on the turntable 442, and the rotation of the turntable 442 can drive the plurality of needle winding mechanisms 441 to be transferred in sequence to obtain the first composite material strip 10 and the second composite strip 10. The position of the second compound strip 20.
  • the turntable 442 can be connected with a driving mechanism such as a motor, and can rotate at a certain angle each time driven by the driving mechanism. After the previous electric core 100 is wound, the turntable 442 rotates and the next needle winding mechanism 441 is rotated to the winding station (that is, the position where the first composite material strip 10 and the second composite material strip 20 can be obtained); Next, the next needle winding mechanism 441 stretches out and clamps the first composite material strip 10 and the second composite material strip 20; after the previous electric core 100 is cut off from the end of the material strip, the next needle winding mechanism 441 can proceed Winding to prepare the next battery cell 100 .
  • a plurality of winding needle mechanisms 441 can alternately enter the winding work Position and wind the cell, so that the production cycle can be improved to reduce the waiting time, thereby improving production efficiency.
  • the fracture slit 103 of the cathode sheet 110 is located in the bending region 102 . That is to say, at least part of the cathode tab 110 of the cell 100 located in the bending region 102 has a fracture slit 103 . Since there is no positive electrode active material layer and no lithium ions in the area corresponding to the fracture slit 103 , the amount of lithium ions that can be deintercalated on the cathode sheet 110 located in the bending area 102 will be significantly reduced.
  • the amount of lithium ions that can be deintercalated by the cathode electrode sheet 110 is also reduced, so the negative electrode of the anode electrode sheet 120 can also be avoided.
  • the lithium intercalation sites of the active material layer are far less than the amount of lithium ions that can be provided by the positive electrode active material layer of the adjacent cathode electrode sheet 110 , thereby reducing or avoiding the occurrence of lithium precipitation.
  • the first separator 131 is combined with the cathode electrode sheet 110 to form the first composite material strip 10
  • the second separator 132 is combined with the anode electrode sheet 120 to form the second composite material belt 20 .
  • the number of material strips entering the winding device 440 can be reduced, thereby avoiding fluctuations in the relative positions of the pole piece and the separator during the winding process, and ensuring that the film layers in the manufactured battery core 100 have a high degree of alignment And it is not easy to dislocate, and it is convenient to control the tension to facilitate the speed of the equipment.
  • the pole piece processing device 420 includes a pinch mechanism 421 and a cutting mechanism 422 , both of which are disposed between the cathode unwinding mechanism 411 and the first composite mechanism 413 .
  • the pinch mechanism 421 can clamp and transport the cathode pole piece 110
  • the cutting mechanism 422 can cut off the cathode pole piece 110 between the pinch mechanism 421 and the first composite mechanism 413, and the pinch mechanism 421 can pull the cut part apart and form Fracture crack 103.
  • the pinching mechanism 421 can pull apart the cutting part by adjusting the conveying speed.
  • the continuous cathode sheet 110 passes through the pinch mechanism 421 and the cutting mechanism 422 .
  • the cutting mechanism 422 cuts the cathode sheet 110, the cathode located upstream of the cutting
  • the pole piece 110 is composited with the first diaphragm 131 in the first composite mechanism 413, and the obtained first composite strip 10 can be kept at a constant speed driven by the first composite mechanism 413; at this time, the pinch mechanism 421 decelerates Or stop the conveying, so that the distance between the cathode pole pieces 110 can be extended until the fracture slit 103 is formed.
  • the pinching mechanism 421 is adjusted to be synchronized with the first composite mechanism 413, and while the cathode electrode piece 110 located downstream of the cutting point is sent into the first composite mechanism 413, the first composite mechanism 413 is assisted to drive the first composite material belt. 10 continue to be transported downstream.
  • the pinching mechanism 421 includes a clamping plate, and the clamping plate can move back and forth along the conveying direction of the cathode electrode piece 110 .
  • the splint can clamp the cathode pole piece 110 located downstream of the cut and move along with the cathode pole piece 110 . In this way, the severed cathode electrode piece 110 can be prevented from falling due to the excessive length of the end, ensuring that the cathode electrode piece 110 can smoothly enter the first composite mechanism 413 .
  • the cutting mechanism 422 can also punch the cathode electrode piece 110 in the manner of the cooperation of the punch and the die, and can cut off the waste material with a certain width on the cathode electrode piece 110, so that the When the cathode sheet 110 is cut off, the fracture crack 103 can be naturally formed.
  • the pinch mechanism 421 can keep synchronously conveying with the first composite mechanism 413 , without the need to separate the distance between the cut points of the cathode electrode piece 110 by the change of the speed of the pinch mechanism 421 to form the fracture crack 103 .
  • the cathode tab 110 may form one or more fractures 103 .
  • the pinching mechanism 421 and the cutting mechanism 422 can repeat the above operations.
  • the pole piece processing device 420 also includes a glue-applying mechanism 423, and the glue-sticking mechanism 423 can bond the first adhesive tape 150 (see FIG. 5 ) on one side of the cathode pole piece 110, so as to close the fractured seam 103
  • the cathode sheet 110 on one side of the pinch mechanism 421 is bonded to the first separator 131 .
  • the fracture slit 103 can divide the cathode pole piece 110 into two pole piece segments, and the cathode pole piece 110 on the side of the fracture slit 103 close to the pinch mechanism 421 refers to the upstream end of one of the pole piece segments.
  • the upstream end refers to the front end of the first composite material belt 10 in the conveying direction, for example, if the first composite material belt 10 is conveyed from left to right, the right end is the upstream end.
  • the upstream end of the pole piece segment Before the first composite material tape 10 enters the winding device 440, it generally needs to be wound around rollers to change direction. When winding around the roller, the upstream end of the pole piece segment is easy to lift and break away from the first diaphragm 131 . Since the first adhesive tape 150 can bond the upstream end of the pole piece segment behind the first diaphragm 131 , the cathode pole piece 110 will not be detached from the first diaphragm 131 when the first composite tape 10 is wound around
  • a part of the first adhesive tape 150 is bonded to the first diaphragm 131 through the fracture slit 103 , and the other part is bonded to the cathode sheet 110 .
  • the first adhesive tape 150 can be bonded before the cathode electrode sheet 110 and the first separator 131 are combined, or can be bonded after the combination.
  • the gluing mechanism 423 is disposed between the cutting mechanism 422 and the first composite mechanism 413 . That is to say, the gluing mechanism 423 completes the gluing before the cathode sheet 110 is combined with the first diaphragm 131 . Therefore, in the process of combining the cathode electrode piece 110 and the first separator 131 by the first combination mechanism 413 , the first adhesive tape 150 can also play a role in preventing the cathode electrode piece 110 from being misaligned with the first separator 131 .
  • the gluing mechanism 423 can also bond a second adhesive tape (not shown) on one side of the cathode sheet 110, so that the cathode electrode located on the side of the fracture slit 103 away from the pinch mechanism 421 The sheet 110 is bonded to the first diaphragm 131 .
  • the fracture slit 103 can divide the cathode pole piece 110 into two pole piece segments, and the cathode pole piece 110 located on the side of the fracture slit 103 away from the pinch mechanism 421 refers to one of the pole piece segments downstream end.
  • the downstream end refers to the rear end of the first composite material belt 10 in the conveying direction, for example, if the first composite material belt 10 is conveyed from left to right, the left end is the downstream end.
  • the second adhesive tape adheres the downstream end of the electrode piece segment to the first separator 131 , it can prevent the cathode electrode piece 110 from shifting relative to the first separator 131 during transportation, thereby improving the quality of the battery cell 100 .
  • the battery cell manufacturing equipment 400 also includes a second pole piece processing device (not shown in the figure), and the second pole piece processing device is used to clean the anode pole piece 120 and the fracture seam of the second composite strip 20 The area corresponding to 103 forms a second fracture crack (not shown in the figure).
  • the structure of the second pole piece processing device may be exactly the same as that of the pole piece processing device 420 , so details will not be repeated here.
  • the existence of the second crack will reduce the content of the negative electrode active material on the anode sheet 120 located in the bending region 102 to a certain extent, thereby reducing the number of lithium intercalation sites.
  • this part of the reduced negative electrode active material will generally fall off from the surface of the anode sheet 120 when it is bent.
  • the existence of the second fracture seam can reduce the resistance when the anode pole piece 120 is bent, and can avoid “powder dropping” in parts other than the second fracture seam to a certain extent. That is to say, the loss of the negative electrode active material caused by the second fracture is actually reduced compared with the conventional situation. Therefore, the setting of the second fracture crack can also suppress the occurrence of lithium precipitation phenomenon to a certain extent.
  • the cell 100 manufactured by the above-mentioned cell manufacturing equipment 400 has a bending area 102 and a straight area 101 , and at least part of the cathode sheet 110 located in the bending area 102 is formed with a fracture slit 103 .
  • There is no positive electrode active material layer and no lithium ions in the region corresponding to the fracture crack 103 so the number of lithium ions that can be deintercalated on the cathode sheet 110 located in the bending region 102 will be significantly reduced. Therefore, the prepared battery cell 100 can effectively suppress lithium precipitation phenomenon.
  • the first separator 131 is combined with the cathode electrode sheet 110 to form the first composite material strip 10
  • the second separator 132 is combined with the anode electrode sheet 120 to form the second composite material belt 20 .
  • the number of material strips entering the winding device 440 can be reduced, thereby avoiding fluctuations in the relative positions of the pole piece and the separator during the winding process, and ensuring that the film layers in the manufactured battery core 100 have a high degree of alignment and not easily misplaced, And it is convenient to control the tension to facilitate the speed of the equipment.

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Abstract

本申请涉及一种电芯，由于至少部分位于弯折区的阴极极片形成有断裂缝，而断裂缝对应的区域不存在正极活性物质层，不存在锂离子，故位于弯折区的阴极极片上能够脱嵌的锂离子的数量将显著减少。析锂现象一般发生于电芯的弯折区，因为弯折会造成阳极极片上的负极活性物质层发生脱落，导致阳极极片上的嵌锂位减少，进而导致从阴极极片上脱嵌的锂离子无法等量的嵌入阳极极片中。但是，由于上述电芯位于弯折区的阴极极片上能够脱嵌的锂离子的数量也显著减少，故能够获得电子并形成锂单质的锂离子数量也将显著减少。因此，上述电芯及电池能够有效地抑制析锂现象产生。此外，本申请还涉及一种电池及电芯制造设备。

Description

电芯、电池及电芯制造设备 技术领域
本申请涉及锂电池技术领域，特别涉及一种电芯、电池及电芯制造设备。
背景技术
锂电池作为一种可再充电的二次电池，具有体积小、能量密度高、可循环次数多及稳定性高等优点，已广泛应用于汽车动力电池。锂电池的电芯包括阴极极片及阳极极片，也可以分别称之为正极极片及负极极片。正极极片上涂覆有锰酸锂、钴酸锂、磷酸铁锂等正极活性物质层，而负极极片上则涂覆有石墨、硅等负极活性物质层。
锂电池充电时，锂离子将从正极脱嵌并嵌入负极。但是，当负极嵌锂空间不足或锂离子从正极脱嵌的速度过快时，都会造成脱嵌的锂离子将无法等量的嵌入负极的负极活性物质层中，而无法嵌入负极活性物质层的锂离子只能在负极极片的表面获得电子并形成银白色的金属锂单质，即产生析锂现象。
析锂会对锂电池的充电效率、能量密度等各项参数产生不利影响。另外，析锂严重时还可以形成锂结晶，而锂结晶则可能刺穿正极极片与负极极片之间的隔膜，从而导致电池内部发生短路，产生严重的安全隐患。
申请内容
基于此，本申请提供了一种结构紧凑的电芯，并提供了一种电池及电芯制造设备。
一种电芯，包括阴极极片、阳极极片及位于相邻的所述阴极极片与所述阳 极极片之间的隔膜，所述阴极极片、所述阳极极片及所述隔膜经卷绕压制形成扁平结构，所述电芯具有平直区及位于所述平直区两端的弯折区，至少部分位于所述弯折区的所述阴极极片形成有沿宽度方向延伸的断裂缝。
在其中一个实施例中，所述断裂缝将所在的所述阴极极片分割成至少两个极片分段，至少两个所述极片分段通过连接件连接形成一体。
在其中一个实施例中，所述连接件为粘接于所述阴极极片的至少一侧，并覆盖所述断裂缝的胶带。
在其中一个实施例中，所述阴极极片每绕经一次所述弯折区能够形成一个弯折部，所述阴极极片由卷绕起始端到卷绕末端形成有多个所述弯折部，且由所述卷绕起始端到所述卷绕末端的第一个所述弯折部上形成有所述断裂缝。
在其中一个实施例中，由所述卷绕起始端到所述卷绕末端的前两个或前四个或前六个所述弯折部上均形成有所述断裂缝。
在其中一个实施例中，至少部分位于所述弯折区的所述阳极极片与所述断裂缝对应的位置形成有第二断裂缝。
一种电池，包括壳体及如上述优选实施例中任一项所述的电芯，所述电芯收容于所述壳体且所述壳体内填充有电解液。
上述电芯及电池，由于至少部分位于弯折区的阴极极片形成有断裂缝，而断裂缝对应的区域不存在正极活性物质层，不存在锂离子，故位于弯折区的阴极极片上能够脱嵌的锂离子的数量将显著减少。析锂现象一般发生于电芯的弯折区，因为弯折会造成阳极极片上的负极活性物质层发生脱落，导致阳极极片上的嵌锂位减少，进而导致从阴极极片上脱嵌的锂离子无法等量的嵌入阳极极片中。但是，由于上述电芯位于弯折区的阴极极片上能够脱嵌的锂离子的数量也显著减少，故能够获得电子并形成锂单质的锂离子数量也将显著减少。因此， 上述电芯及电池能够有效地抑制析锂现象产生。
一种电芯制造设备，包括：
第一放料装置，用于提供阴极极片；
极片处理装置，能够在所述阴极极片的预设区域形成断裂缝并设置连接件，所述断裂缝将所在的所述阴极极片分割成至少两个极片分段，至少两个所述极片分段通过所述连接件连接形成一体；
第二放料装置，用于提供阳极极片；
隔膜放料装置，用于在相邻的所述阴极极片与所述阳极极片之间设置隔膜；
卷绕装置，包括卷针机构，所述卷针机构能够将所述阳极极片、所述阴极极片及所述隔膜卷绕成电芯；
其中，所述电芯能够被压制成具有平直区及弯折区的扁平结构，所述预设区域位于所述弯折区。
在其中一个实施例中，所述极片处理装置包括：
至少两个夹送机构，每个所述夹送机构均能够夹持并输送所述阴极极片；
设于相邻两个所述夹送机构之间的切割机构，每个所述切割机构能够将所述阴极极片切断，以得到至少两个极片分段，至少两个所述夹送机构能够分别夹持至少两个所述极片分段并拉开相邻两个所述极片分段之间的距离以形成所述断裂缝；
贴胶机构，能够将作为所述连接件的胶带粘贴于所述阴极极片的至少一侧并覆盖所述断裂缝，以将所述至少两个极片分段连接形成一体。
在其中一个实施例中，还包括第二极片处理装置，所述第二极片处理装置用于在所述阳极极片与所述预设区域对应的区域形成第二断裂缝。
上述电芯制造设备，所制得的电芯具有弯折区及平直区，且至少部分位于 弯折区的阴极极片形成有断裂缝。断裂缝对应的区域不存在正极活性物质层，不存在锂离子，故位于弯折区的阴极极片上能够脱嵌的锂离子的数量将显著减少。因此，所制得的电芯能够有效地抑制析锂现象产生。而且，上述电芯制造设备能够实现电芯的连续制备，效率较高。
一种电芯制造设备，包括：
第一放料装置，包括阴极放卷机构、极片处理机构、第一隔膜放卷机构及第一复合机构，所述阴极放卷机构用于提供阴极极片，所述极片处理机构能够在所述阴极极片的预设区域形成断裂缝并设置连接件，所述断裂缝将所在的所述阴极极片分割成至少两个极片分段，至少两个所述极片分段通过所述连接件连接形成一体，所述第一隔膜放卷机构用于放卷第一隔膜，所述第一复合机构能够接收所述阴极极片及所述第一隔膜并进行复合，以得到第一复合料带；
第二放料装置，包括阳极放卷机构、第二隔膜放卷机构及第二复合机构，所述阳极放卷机构用于提供阳极极片，所述第二隔膜放卷机构用于放卷第二隔膜，所述第二复合机构能够接收所述阳极极片及所述第二隔膜并进行复合，以得到第二复合料带；
卷绕装置，包括卷针机构，所述卷针机构能够将所述第一复合料带及所述第二复合料带卷绕成电芯；
其中，所述电芯能够被压制成具有平直区及弯折区的扁平结构，所述预设区域位于所述弯折区。
在其中一个实施例中，所述极片处理机构包括：
至少两个夹送机构，每个所述夹送机构均能够夹持并输送所述阴极极片；
设于相邻两个所述夹送机构之间的切割机构，每个所述切割机构能够将所述阴极极片切断，以得到至少两个极片分段，至少两个所述夹送机构能够分别 夹持至少两个所述极片分段并拉开相邻两个所述极片分段之间的距离以形成所述断裂缝；
贴胶机构，能够将作为所述连接件的胶带粘贴于所述阴极极片的至少一侧并覆盖所述断裂缝，以将所述至少两个极片分段连接形成一体。
上述电芯制造设备，所制得的电芯不仅能够有效地抑制析锂现象产生。而且，在进行卷绕之前，第一隔膜与阴极极片复合形成第一复合料带，第二隔膜与阳极极片复合形成第二复合料带。如此，可减少进入卷绕装置的料带的数量，从而避免在卷绕过程中极片与隔膜的相对位置发生波动，保证所制得的电芯中各膜层具有较高的对齐度且不易错位，并方便控制张力以利于设备提速。
一种电芯制造设备，包括：
第一放料装置，用于提供第一复合料带，所述第一复合料带包括第一隔膜及覆设于所述第一隔膜的阴极极片；
极片处理装置，能够在所述第一复合料带的所述阴极极片上形成断裂缝；
第二放料装置，用于提供第二复合料带，所述第二复合料带包括第二隔膜及覆设于所述第二隔膜的阳极极片；及
卷绕装置，包括卷针机构，所述卷针机构能够将所述第一复合料带及所述第二复合料带卷绕成电芯；
其中，所述电芯能够被压制成具有平直区及弯折区的扁平结构，所述断裂缝位于所述弯折区。
在其中一个实施例中，所述第一放料装置包括：
阴极放卷机构，用于放卷所述阴极极片；
第一隔膜放卷机构，用于放卷所述第一隔膜；及
第一复合机构，能够接收所述阴极极片及所述第一隔膜并进行复合，以得 到所述第一复合料带。
在其中一个实施例中，所述极片处理装置包括设置于所述阴极放卷机构与所述第一复合机构之间的夹送机构及切割机构，所述夹送机构能够夹紧并输送所述阴极极片，所述切割机构能够将所述夹送机构与所述第一复合机构之间的所述阴极极片切断，所述夹送机构能够将切断处拉开并形成所述断裂缝。
在其中一个实施例中，所述极片处理装置还包括贴胶机构，所述贴胶机构能够在所述阴极极片的一侧粘接第一胶带，以将位于所述断裂缝靠近所述夹送机构一侧的所述阴极极片粘接于所述第一隔膜。
在其中一个实施例中，所述贴胶机构还能够在所述阴极极片的一侧粘接第二胶带，以将位于所述断裂缝远离所述夹送机构一侧的所述阴极极片粘接于所述第一隔膜。
在其中一个实施例中，所述第一复合机构包括上压辊及下压辊，所述阴极极片及所述第一隔膜能够穿过所述上压辊与所述下压辊之间。
在其中一个实施例中，所述第二放料装置包括：
阳极放卷机构，用于放卷所述阳极极片；
第二隔膜放卷机构，用于放卷所述第二隔膜；及
第二复合机构，能够接收所述阳极极片及所述第二隔膜并进行复合，以得到所述第二复合料带。
在其中一个实施例中，还包括第二极片处理装置，所述第二极片处理装置用于在所述第二复合料带的所述阳极极片与所述断裂缝对应的区域形成第二断裂缝。
上述电芯成型设备，所制得的电芯具有弯折区及平直区，且至少部分位于弯折区的阴极极片形成有断裂缝。断裂缝对应的区域不存在正极活性物质层， 不存在锂离子，故位于弯折区的阴极极片上能够脱嵌的锂离子的数量将显著减少。析锂现象一般发生于电芯的弯折区，因为弯折会造成阳极极片上的负极活性物质层发生脱落，导致阳极极片上的嵌锂位减少，进而导致从阴极极片上脱嵌的锂离子无法等量的嵌入阳极极片中。但是，由于上述电芯位于弯折区的阴极极片上能够脱嵌的锂离子的数量也显著减少，故能够获得电子并形成锂单质的锂离子数量也将显著减少。因此，上述电芯成型设备所制得的电芯能够有效地抑制析锂现象产生。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请第一个实施例中电芯沿垂直于卷绕轴线的方向的截面示意图；
图2为本申请第二个实施例中电芯沿垂直于卷绕轴线的方向的截面示意图；
图3为图1或图2所示电芯位于弯折区的部分阴极极片的展开示意图；
图4为本申请第三个实施例中电芯沿垂直于卷绕轴线的方向的截面示意图；
图5为图4所示电芯位于弯折区的部分阴极极片的展开示意图；
图6为本申请第一个实施例中电芯制造设备的结构示意图；
图7为图6所示电芯制造设备中极片处理装置的结构示意图；
图8为本申请第二个实施例中电芯制造设备的结构示意图；
图9为图8所示电芯制造设备中极片处理机构的结构示意图；
图10为本申请第三个实施例中电芯制造设备的结构示意图。
具体实施方式
为使本申请的上述目的、特征和优点能够更加明显易懂，下面结合附图对本申请的具体实施方式做详细的说明。在下面的描述中阐述了很多具体细节以便于充分理解本申请。但是本申请能够以很多不同于在此描述的其它方式来实施，本领域技术人员可以在不违背本申请内涵的情况下做类似改进，因此本申请不受下面公开的具体实施例的限制。
在本申请的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本申请的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本申请中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
在本申请中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特 征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
需要说明的是，当元件被称为“固定于”或“设置于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“上”、“下”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。
本申请提供了一种电芯、电池及电芯制造设备。其中，上述电池包括壳体及如上述电芯，电芯收容于壳体且壳体内填充有电解液；上述电芯制造设备用于制备上述电芯。
请参阅图1及图3，本申请第一个实施例中的电芯100包括阴极极片110、阳极极片120及隔膜130，隔膜130位于相邻的阴极极片110与阳极极片120之间，用于将阴极极片110与阳极极片120隔开以避免短路。在制备电芯100时，阴极极片110、阳极极片120及隔膜130先进行层叠，再经卷绕压制便可形成扁平结构。
针对不同型号的电芯100，阴极极片110、阳极极片120及隔膜130的相对位置可存在差异。譬如，本实施例中的阴极极片110、阳极极片120均为一个，隔膜130为两个，其中一个隔膜130衬于最下方，其上层叠阴极极片110，阴极极片110上设置另一个隔膜130，阳极极片120则层叠于第二个隔膜130上。
显然，在其他实施例中，譬如图2所示，本申请第二个实施例中的电芯100中，阴极极片110与阳极极片120的位置可对调。
进一步的，电芯100具有平直区101及位于平直区101两端的弯折区102。平直区101是指扁平结构的电芯100中具有平行结构的区域，即在平直区101 内的阴极极片110、阳极极片120及隔膜130处于相互基本平行的状态，位于平直区101的每层阴极极片110、阳极极片120及隔膜130的表面均大致为平面。弯折区102是指扁平结构的电芯100中具有弯折结构的区域，即在该弯折区102内的阴极极片110、阳极极片120及隔膜130均弯折，每层阴极极片110、阳极极片120及隔膜130的表面均为曲面。
阴极极片110上涂覆有由锰酸锂、钴酸锂、磷酸铁锂等形成的正极活性物质层，而阳极极片120上则涂覆有由石墨、硅等形成的负极活性物质层。申请人经研究发现，位于弯折区102的阴极极片110、阳极极片120在弯折过程中容易导致各自的活性物质脱落，称之为“掉粉”。尤其是阳极极片120上的负极活性物质的脱落，将导致阳极极片120的负极活性物质层的嵌锂位少于其相邻的阴极极片110的正极活性物质层能够提供的锂离子数量，进而导致由正极活性物质层脱嵌的锂离子将无法等量的嵌入负极活性物质层。因此，电池在充电时，一般会在电芯100的弯折区102发生析锂现象。
对应的，由于平直区101的阴极极片110、阳极极片120在电芯100的成型过程中无需进行弯折，几乎不会产生“掉粉”，故平直区101内阳极极片120的负极活性物质层的嵌锂位，能够与其相邻的阴极极片110的正极活性物质层能够提供的锂离子数量保持较好的匹配。因此，电芯100的平直区101一般不会发生析锂现象。
析锂会对电芯100及电池产生一系列的不利影响，故需要抑制电芯100，尤其是弯折区102析锂现象的发生。
请再次参阅图3，至少部分位于弯折区102的阴极极片110形成有沿宽度方向延伸的断裂缝103，断裂缝103将所在的阴极极片110分割成至少两个极片分段(图未标)，至少两个极片分段通过连接件140连接形成一体。
断裂缝103能够将阴极极片110断开，由于断裂缝103对应的区域不存在正极活性物质层，不存在锂离子，故位于弯折区102的阴极极片110上能够脱嵌的锂离子的数量将显著减少。因此，即使相邻的阳极极片120在弯折过程中发生了“掉粉”，但由于阴极极片110可脱嵌的锂离子的数量也同样减少，故也能避免阳极极片120的负极活性物质层的嵌锂位远少于相邻的阴极极片110的正极活性物质层能够提供的锂离子数量，从而能够降低或避免析锂现象的发生。
具体在本实施例中，至少部分位于弯折区102的阳极极片120与断裂缝103对应的位置形成有第二断裂缝(图未示)。
同样的，阳极极片120对应第二断裂缝的位置不存在负极活性物质。因此，当阳极极片120在电芯100的弯折区102进行弯折时，能够有效地避免负极活性物质“掉粉”，从而避免所制得的电芯100中夹杂较多的粉末杂质，有利于提升电芯100的品质。
虽然，第二断裂缝的存在会在一定程度上减少位于弯折区102的阳极极片120上负极活性物质的含量，从而导致嵌锂位的数量减少。但是，在不形成第二断裂缝的情况下，这部分减少的负极活性物质在弯折时一般也会从阳极极片120的表面脱落。而且，第二断裂缝的存在能够减小阳极极片120弯折时的阻力，能够一定程度上避免第二断裂缝以外的其他部分发生“掉粉”。也就是说，第二断裂缝所导致的负极活性物质的损失相较于常规情况实际上是减少的。因此，第二断裂缝的设置还能够在一定程度上抑制析锂现象的发生。
连接件140为绝缘部件，能够将分割成的至少两个极片分段连接形成一体，从而避免卷绕过程中阴极极片110发生移位，有助于提升电芯100的稳定性及可靠性。具体在本实施例中，连接件140为粘接于阴极极片110的至少一侧，并覆盖断裂缝103的胶带。
胶带可与相邻的两个极片分段连接，从而将两个极片分段连接形成一体。胶带可以粘接于阴极极片110的一侧，也可粘接于阴极极片110的相对两侧。本实施例中，为了提升可靠性，阴极极片110的两侧均粘接有胶带。胶带的数量一般与断裂缝103的数量对应，譬如，阴极极片110上形成有两个断裂缝103，则胶带需设置有四个。而且，每个胶带都沿断裂缝103的延伸方向，即阴极极片110的宽度方向进行贴附。
阴极极片110每绕经一次弯折区102能够形成一个弯折部(图未标)，阴极极片110由卷绕起始端到卷绕末端形成有多个弯折部。卷绕起始端指的是开始进行卷绕的一端，一般位于电芯100的中心，卷绕末端则位于电芯100的外侧。理论上，位于弯折区102的每层阴极极片110，即每个弯折部均形成断裂缝103，则能够最大限度的避免析锂现象的发生，但这将导致电芯100成型工艺复杂，制造成本升高。
因此，在本实施例中，阴极极片110由卷绕起始端到卷绕末端的第一个弯折部上形成断裂缝103。上述第一个弯折部位于电芯100的一端(图1所示的左端)，指的是位于弯折区102且最靠近电芯100中心的一层阴极极片110。在弯折过程中，越靠近电芯100中心的极片的弯折程度越大，故活性物质脱落最为严重，析锂现象也最为明显。因此，在弯折区102的最内层的阴极极片110上形成断裂缝103，可以显著减少最内层的阴极极片110与相邻阳极极片120之间的析锂现象，从而在工艺最简化的前提下，减轻或避免电芯100的析锂现象。
极片分段的数量由断裂缝103的数量决定。譬如，一个断裂缝103可分割出两个极片分段，两个断裂缝103可分割出三个极片分段，以此类推。通常，针对阴极极片110在弯折区102进行多次弯折的情况，阴极极片110由卷绕起始端到卷绕末端的前两个或前四个或前六个弯折部上均形成有断裂缝103。
断裂缝103的具体数量可根据阴极极片110的弯折次数进行调整。当阴极极片110的前两个弯折部上均形成有断裂缝103时，在电芯100左右两端的弯折区102内，由内向外的第一层阴极极片110形成有断裂缝103；当阴极极片110的前四个弯折部上均形成有断裂缝103时，在电芯100左右两端的弯折区102内，由内向外的前两层阴极极片110形成有断裂缝103；而当阴极极片110的前六个弯折部上均形成有断裂缝103时，在电芯100左右两端的弯折区102内，由内向外的前三层阴极极片110形成有断裂缝103。如此，可使得对析锂现象的抑制效果进一步提升。
上述电芯100，由于至少部分位于弯折区102的阴极极片110形成有断裂缝103，而断裂缝103对应的区域不存在正极活性物质层，不存在锂离子，故位于弯折区102的阴极极片110上能够脱嵌的锂离子的数量将显著减少。析锂现象一般发生于电芯100的弯折区102，因为弯折会造成阳极极片120上的负极活性物质层发生脱落，导致阳极极片120上的嵌锂位减少，进而导致从阴极极片110上脱嵌的锂离子无法等量的嵌入阳极极片120中。但是，由于上述电芯100位于弯折区102的阴极极片110上能够脱嵌的锂离子的数量也显著减少，故能够获得电子并形成锂单质的锂离子数量也将显著减少。因此，上述电芯100能够有效地抑制析锂现象产生。
请参阅图4及图5，本申请第三个实施例中的电芯100包括阴极极片110、阳极极片120及隔膜130，隔膜130位于相邻的阴极极片110与阳极极片120之间，用于将阴极极片110与阳极极片120隔开以避免短路。阴极极片110、阳极极片120及隔膜130相互层叠，再经卷绕压制便可形成扁平结构。
进一步的，电芯100具有平直区101及位于平直区101两端的弯折区102。平直区101是指扁平结构的电芯100中具有平行结构的区域，即在平直区101 内的阴极极片110、阳极极片120及隔膜130处于相互基本平行的状态，位于平直区101的每层阴极极片110、阳极极片120及隔膜130的表面均大致为平面。弯折区102是指扁平结构的电芯100中具有弯折结构的区域，即在该弯折区102内的阴极极片110、阳极极片120及隔膜130均弯折，每层阴极极片110、阳极极片120及隔膜130的表面均为曲面。
阴极极片110上涂覆有由锰酸锂、钴酸锂、磷酸铁锂等形成的正极活性物质层，而阳极极片120上则涂覆有由石墨、硅等形成的负极活性物质层。申请人经研究发现，位于弯折区102的阴极极片110、阳极极片120在弯折过程中容易导致各自的活性物质脱落，称之为“掉粉”。尤其是阳极极片120上的负极活性物质的脱落，将导致阳极极片120的负极活性物质层的嵌锂位少于其相邻的阴极极片110的正极活性物质层能够提供的锂离子数量，进而导致由正极活性物质层脱嵌的锂离子将无法等量的嵌入负极活性物质层。因此，电池在充电时，一般会在电芯100的弯折区102发生析锂现象。
对应的，由于平直区101的阴极极片110、阳极极片120在电芯100的成型过程中无需进行弯折，几乎不会产生“掉粉”，故平直区101内阳极极片120的负极活性物质层的嵌锂位，能够与其相邻的阴极极片110的正极活性物质层能够提供的锂离子数量保持较好的匹配。因此，电芯100的平直区101一般不会发生析锂现象。
析锂会对电芯100及电池产生一系列的不利影响，故需要抑制电芯100，尤其是弯折区102析锂现象的发生。请再次参阅图5，至少部分位于弯折区102的阴极极片110形成有沿宽度方向延伸的断裂缝103。
与第一个实施例及第二个实施例中的电芯100相比，第三个实施例中的电芯100的区别包括：并未设置连接件140将断裂缝103两侧的极片分段连接形 成一体。
由于断裂缝103对应的区域不存在正极活性物质层，不存在锂离子，故位于弯折区102的阴极极片110上能够脱嵌的锂离子的数量将显著减少。因此，即使相邻的阳极极片120在弯折过程中发生了“掉粉”，但由于阴极极片110可脱嵌的锂离子的数量也同样减少，故也能避免阳极极片120的负极活性物质层的嵌锂位远少于相邻的阴极极片110的正极活性物质层能够提供的锂离子数量，从而能够降低或避免析锂现象的发生。
断裂缝103能够将阴极极片110分割成两个极片分段，具体在本实施例中，阴极极片110的一侧粘接有第一胶带150，第一胶带150能够将极片分段粘接于隔膜130，从而防止卷绕过程中阴极极片110与隔膜130分离。
具体在本实施例中，至少部分位于弯折区102的阳极极片120与断裂缝103对应的位置形成有第二断裂缝(图未示)。
同样的，阳极极片120对应第二断裂缝的位置不存在负极活性物质。因此，当阳极极片120在电芯100的弯折区102进行弯折时，能够有效地避免负极活性物质“掉粉”，从而避免所制得的电芯100中夹杂较多的粉末杂质，有利于提升电芯100的品质。
虽然，第二断裂缝的存在会在一定程度上减少位于弯折区102的阳极极片120上负极活性物质的含量，从而导致嵌锂位的数量减少。但是，在不形成第二断裂缝的情况下，这部分减少的负极活性物质在弯折时一般也会从阳极极片120的表面脱落。而且，第二断裂缝的存在能够减小阳极极片120弯折时的阻力，能够一定程度上避免第二断裂缝以外的其他部分发生“掉粉”。也就是说，第二断裂缝所导致的负极活性物质的损失相较于常规情况实际上是减少的。因此，第二断裂缝的设置还能够在一定程度上抑制析锂现象的发生。
上述电芯100，由于至少部分位于弯折区102的阴极极片110形成有断裂缝103，而断裂缝103对应的区域不存在正极活性物质层，不存在锂离子，故位于弯折区102的阴极极片110上能够脱嵌的锂离子的数量将显著减少。析锂现象一般发生于电芯100的弯折区102，因为弯折会造成阳极极片120上的负极活性物质层发生脱落，导致阳极极片120上的嵌锂位减少，进而导致从阴极极片110上脱嵌的锂离子无法等量的嵌入阳极极片120中。但是，由于上述电芯100位于弯折区102的阴极极片110上能够脱嵌的锂离子的数量也显著减少，故能够获得电子并形成锂单质的锂离子数量也将显著减少。因此，上述电芯100能够有效地抑制析锂现象产生。
请参阅图6及图7，本申请第一个实施例中的电芯制造设备200包括第一放料装置210、极片处理装置220、第二放料装置230、隔膜放料装置240及卷绕装置250。其中，第一个实施例中的电芯制造设备200能够用于制备图1至图3所示的电芯100。
第一放料装置210用于提供阴极极片110；第二放料装置230用于提供阳极极片120；隔膜放料装置240用于在相邻的阴极极片110与阳极极片120之间设置隔膜130。第一放料装置210、第二放料装置230及隔膜放料装置240的数量根据所要加工的电芯100的结构确定。具体在本实施例中，阴极极片110、阳极极片120均为一个，隔膜130为两个。因此，第一放料装置210、第二放料装置230分别设置一个，而隔膜放料装置240则设置两个。
第一放料装置210、第二放料装置230及隔膜放料装置240均可采用放卷轴的形式，从而实现阴极极片110、阳极极片120及隔膜130的连续放料。
卷绕装置250包括卷针机构251。其中，卷针机构251能够将阳极极片120、阴极极片110及隔膜130卷绕成电芯100。卷绕得到的电芯100大致呈圆柱形或 椭圆形，经过压制后可得到扁平结构。该扁平结构的电芯100具有平直区101及弯折区102。其中，电芯100的具体构造及平直区101及弯折区102的定义已在前文进行详细描述，故在此不再赘述。
在本实施例中，卷绕装置250还包括转盘252，多个卷针机构251设置于转盘252，转盘252转动可带动多个卷针机构251依次转移至能够获得阳极极片120、阴极极片110及隔膜130的位置。
转盘252可以连接电机等驱动机构，并能够在驱动机构的驱使下每次转动一定角度。在前一个电芯100卷绕完毕后，转盘252旋转并将下一个卷针机构251旋转至卷绕工位(即，能够获得阳极极片120、阴极极片110及隔膜130的位置)；接着，该下一个卷针机构251伸出并获得阳极极片120、阴极极片110及隔膜130；待前一个电芯100从料带末端切断后，下一个卷针机构251便可进行卷绕以进行下一个电芯100的制备。以此类推，多个卷针机构251能够交替进入卷绕工位并进行电芯卷绕，从而能够提升生产节拍以减少等待时间，进而提升生产效率。
在阴极极片110进入卷绕装置250之前，还需要由极片处理装置220进行处理。具体的，极片处理装置220能够在阴极极片110的预设区域形成断裂缝103并设置连接件140，断裂缝103将所在的阴极极片110分割成至少两个极片分段，至少两个极片分段通过连接件140连接形成一体。
而且，在卷绕得到的电芯100中，阴极极片110的预设区域位于弯折区102。也就是说，在所制得的电芯100中，位于弯折区102的至少部分阴极极片110具有断裂缝103。如前所述，由于断裂缝103对应的区域不存在正极活性物质层，不存在锂离子，故位于弯折区102的阴极极片110上能够脱嵌的锂离子的数量将显著减少。因此，经电芯制造设备200所制得的电芯100能够降低或避免析 锂现象的发生。
具体在本实施例中，电芯制造设备200还包括第二极片处理装置(图未示)，第二极片处理装置用于在阳极极片120与预设区域对应的区域形成第二断裂缝。
第二极片处理装置的结构可与极片处理装置220的结构完全相同。如前所述，通过在阳极极片120形成第二断裂缝，能够有效地避免负极活性物质“掉粉”，从而有利于提升电芯100的品质。而且，第二断裂缝的设置还能够在一定程度上抑制析锂现象的发生。
连接件140为绝缘部件，能够将分割成的至少两个极片分段连接形成一体，从而避免卷绕过程中阴极极片110发生移位。具体在本实施例中，连接件140为粘接于阴极极片110的至少一侧，并覆盖断裂缝103的胶带。
请再次参阅图7，在本实施例中，极片处理装置220包括夹送机构221、切割机构222及贴胶机构223。
夹送机构221为至少两个，每个夹送机构221均能够夹持并输送阴极极片110。切割机构222设于相邻两个夹送机构221之间，每个切割机构222能够将阴极极片110切断，以得到至少两个极片分段。至少两个极片分段能够由不同的夹送机构221夹持并沿输送方向进行输送。而且，至少两个夹送机构221能够驱使所夹持的极片分段沿输送方向输送不同的距离，从而使相邻两个极片分段之间形成断裂缝103。具体的，不同的夹送机构221之间可以通过形成速度差，从而将各自所夹持的极片分段的距离拉开，以形成断裂缝103。
需要指出的是，在其他实施例中，切割机构222还可以采用凸模与凹模配合的方式对阴极极片110进行冲切，能够在阴极极片110上切除具有一定宽度的废料，从而在将阴极极片110切断的同时便可自然形成断裂缝103。如此，每个夹送机构221均可保持匀速，无需通过夹送机构221将极片分段之间的距离 拉开。
具体在本实施例中，夹送机构221为三个，切割机构222为两个，每相邻两个夹送机构221之间均设置一个切割机构222。阴极极片110经过极片处理装置200的处理后，可在阴极极片110形成两个断裂缝103并得到三个极片分段，每个极片分段分别由一个夹送机构221夹持。
贴胶机构223能够将作为连接件140的胶带粘贴于阴极极片110的至少一侧并覆盖断裂缝103，以将至少两个极片分段连接形成一体。贴胶机构223同样设置于相邻两个夹送机构221之间，贴胶机构223与切割机构222成对存在。更具体的，贴胶机构223位于与其成对的切割机构222的下游端。
具体在本实施例中，贴胶机构223在阴极极片110的两侧均粘贴胶带，以提升可靠性。
下面结合附图对极片处理装置220的工作过程进行描述：
为了便于下面的描述，阴极极片110输送方向的上游端到下游端(图7从下到上)的三个夹送机构221分别称为第一个、第二个及第三个夹送机构221；两个切割机构222分别称为第一个及第二个切割机构222；两个贴胶机构223分别称为第一个及第二个贴胶机构223；得到的三个极片分段分别称为第一个、第二个及第三个极片分段；
待阴极极片110进入极片处理装置220后，极片输送方向上的第一个切割机构222将第一个夹送机构221与第二个夹送机构221之间的阴极极片110切断，而第二个切割机构222将第二个夹送机构221与第三个夹送机构221之间的阴极极片100切断，得到三个极片分段；第一个夹送机构221、第二个夹送机构221及第三个夹送机构221分别夹持三个极片分段并朝向下游输送。其中，第一个夹送机构221的输送速度小于第二个夹送机构221的输送速度，而第二 个夹送机构221的输送速度小于第三个夹送机构221的输送速度。因此，第一个极片分段向下游移动的距离小于第二个极片分段向下游移动的距离，而第二个极片分段向下游移动的距离小于第三个极片分段向下游移动的距离。如此，三个极片分段之间的距离被拉开，形成两个断裂缝103。
进一步的，断裂缝103形成后，两个贴胶机构223分别在两个断裂缝103的两侧粘贴胶带。具体的，第一个贴胶机构223贴胶带将第一个极片分段与第二个极片分段粘接，而第二个贴胶机构223则贴胶带将第二个极片分段与第三个极片分段粘接，从而将三个极片分段连接成一体。
极片处理装置220能够在阴极极片110上形成更多的断裂缝103。如此，便可使多个位于弯折区102的阴极极片110上具有断裂缝103，从而进一步抑制析锂现象的发生。当需要在阴极极片110形成更多的断裂缝103时，可增加夹送机构221、切割机构222及贴胶机构223的数量，使得切割机构222及贴胶机构223的数量与所需形成的断裂缝103的数量一致即可。
具体在本实施例中，每个夹送机构221均包括夹辊，且每个夹送机构221的夹辊的转速可单独调节。通过调节夹辊的转速，可对每个夹送机构221的输送速度进行调节。如此，可使不同的夹送机构221之间形成速度差，从而将各自所夹持的极片分段的距离拉开以形成断裂缝103。夹辊的速度调节更方便，且夹辊所占空间更小，有利于使夹送机构221的结构更紧凑。
需要指出的是，也可通过对夹送机构221的夹辊的启动及停止的时机进行控制，来达到将各自所夹持的极片分段的距离拉开的目的。此外，在其他实施例中，夹送机构221还可通过夹板往复移动来实现对阴极极片110的夹持及输送，并通过对夹板的移动速度及启停时机进行控制，来达到将各自所夹持的极片分段的距离拉开的目的。
为了使阴极极片110及阳极极片120顺利进入卷绕装置250，在本实施例中，电芯制造设备200还包括极片入料装置260，极片入料装置260用于将阴极极片110及阳极极片120插入卷针机构251内。
具体的，极片入料装置260内可设置夹辊，通过夹辊夹持并驱动极片，便可将极片插入对应的卷针机构251。极片入料装置260的数量与极片的数量一致，譬如，本实施例中的阴极极片110及阳极极片120均为一个，则极片入料装置260设置有两个，分别用于阴极极片110及阳极极片120的入料。
上述电芯制造设备200，所制得的电芯100具有弯折区102及平直区101，且至少部分位于弯折区102的阴极极片110形成有断裂缝103。断裂缝103对应的区域不存在正极活性物质层，不存在锂离子，故位于弯折区102的阴极极片110上能够脱嵌的锂离子的数量将显著减少。因此，所制得的电芯100能够有效地抑制析锂现象产生。而且，上述电芯制造设备200能够实现电芯100的连续制备，效率较高。
请参阅图8及图9，本申请第二个实施例中的电芯制造设备300包括第一放料装置310、第二放料装置320及卷绕装置330。其中，第二个实施例中的电芯制造设备300也能够用于制备图1至图3所示的电芯100。
第一放料装置310包括阴极放卷机构311、极片处理机构312、第一隔膜放卷机构313及第一复合机构314。其中，阴极放卷机构311用于提供阴极极片110，第一隔膜放卷机构313用于放卷第一隔膜131，第一复合机构314能够接收阴极极片110及第一隔膜131并进行复合，以得到第一复合料带10。
具体在本实施例中，第一复合机构314包括上压辊(图未标)及下压辊(图未标)，阴极极片110及第一隔膜131能够穿过上压辊与下压辊之间。
上压辊及下压辊均能够绕自身的轴线转动，且其中一个与驱动组件连接， 能够主动旋转。阴极极片110及第一隔膜131穿过时，上压辊与下压辊配合能够将阴极极片110及第一隔膜131夹紧。随着上压辊及下压辊转动，阴极极片110及第一隔膜131被压合成型得到第一复合料带10。其中，上压辊及下压辊可采用热压辊，从而使得第一复合料带10热压成型。显然，第一复合料带10也可冷压成型。
第二放料装置320包括阳极放卷机构321、第二隔膜放卷机构322及第二复合机构323。其中，阳极放卷机构321用于提供阳极极片120，第二隔膜放卷机构322用于放卷第二隔膜132，第二复合机构323能够接收阳极极片120及第二隔膜132并进行复合，以得到第二复合料带20。第二复合机构323的结构可与第一复合机构314完全相同，故在此不再赘述。
需要指出的是，第二隔膜放卷机构322可与第一隔膜放卷机构313的结构完全相同，第一隔膜131及第二隔膜132均是指图1及图2所示电芯100中的隔膜130。为了便于区分，特将第一复合料带10及第二复合料带20中的隔膜分别称为第一隔膜131及第二隔膜132。第一隔膜131及第二隔膜132为绝缘膜，能够起到防止短路的作用。
此外，第一放料装置310还包括极片处理机构312，极片处理机构312能够在阴极极片110的预设区域形成断裂缝103并设置连接件140，断裂缝103将所在的阴极极片110分割成至少两个极片分段，至少两个极片分段通过连接件140连接形成一体。也就是说，阴极极片110上形成断裂缝103后，由连接件140将断裂缝103的两侧相连，从而能够使阴极极片110与第一隔膜131顺利进行复合。而且，在得到的第一复合料带10中，其阴极极片110的预设区域形成有断裂缝103。
卷绕装置330包括卷针机构331，卷针机构331能够将第一复合料带10及 第二复合料带20卷绕成电芯100。卷绕得到的电芯100大致呈圆柱形或椭圆形，经过压制后可得到扁平结构。该扁平结构的电芯100具有平直区101及弯折区102。其中，阴极极片110上的预设区域位于弯折区102。电芯100的具体构造及平直区101及弯折区102的定义已在前文进行详细描述，故在此不再赘述。
可见，在所制得的电芯100中，位于弯折区102的至少部分阴极极片110具有断裂缝103。因此，经电芯制造设备300所制得的电芯100也能够降低或避免析锂现象的发生。
极片处理机构312的结构与第一个实施例中的电芯制造设备200的极片处理装置220的结构相同。具体请一并参阅图9，在本实施例中，极片处理机构312包括夹送机构3121、切割机构3122及贴胶机构3123
夹送机构3121为至少两个，每个夹送机构3121均能够夹持并输送阴极极片110。切割机构3122设于相邻两个夹送机构3121之间，每个切割机构3122能够将阴极极片110切断，以得到至少两个极片分段。至少两个极片分段能够由不同的夹送机构3121夹持并沿输送方向进行输送。而且，至少两个夹送机构3121能够驱使所夹持的极片分段沿输送方向输送不同的距离，从而使相邻两个极片分段之间形成断裂缝103。具体的，不同的夹送机构3121之间可以通过形成速度差，从而将各自所夹持的极片分段的距离拉开，以形成断裂缝103。
具体在本实施例中，夹送机构3121为三个，切割机构3122为两个，每相邻两个夹送机构3121之间均设置一个切割机构3122。阴极极片110经过极片处理装置200的处理后，可在阴极极片110形成两个断裂缝103并得到三个极片分段，每个极片分段分别由一个夹送机构3121夹持。
贴胶机构3123能够将作为连接件140的胶带粘贴于阴极极片110的至少一侧并覆盖断裂缝103，以将至少两个极片分段连接形成一体。贴胶机构3123同 样设置于相邻两个夹送机构3121之间，贴胶机构3123与切割机构3122成对存在。更具体的，贴胶机构3123位于与其成对的切割机构3122的下游端。
具体在本实施例中，贴胶机构3123在阴极极片110的两侧均粘贴胶带，以提升可靠性。
此外，上述电芯制造设备300中的阴极放卷机构311、阳极放卷机构321、第一隔膜放卷机构313(第二隔膜放卷机构322)及卷绕装置330分别与第一个实施例中的电芯制造设备200中第一放料装置210、第二放料装置220、隔膜放料装置240及卷绕装置250的结构相同，故在此不再赘述。
上述电芯制造设备300，所制得的电芯100不仅能够有效地抑制析锂现象产生。而且，在进行卷绕之前，第一隔膜131与阴极极片110复合形成第一复合料带10，第二隔膜132与阳极极片120复合形成第二复合料带20。如此，可减少进入卷绕装置330的料带的数量，从而避免在卷绕过程中极片与隔膜的相对位置发生波动，保证所制得的电芯100中各膜层具有较高的对齐度且不易错位，并方便控制张力以利于设备提速。
请参阅图10，本申请第三个实施例中的电芯制造设备400包括第一放料装置410、极片处理装置420、第二放料装置430及卷绕装置440。其中，第三个实施例中的电芯制造设备400能够制备图4所示的电芯100。
第一放料装置410用于提供第一复合料带10，第一复合料带10包括第一隔膜131及覆设于第一隔膜131的阴极极片110。第二放料装置430用于提供第二复合料带20，第二复合料带20包括第二隔膜132及覆设于第二隔膜132的阳极极片120。其中，第一隔膜131及第二隔膜132均是指图4所示电芯100中的隔膜130。为了便于区分，特将第一复合料带10及第二复合料带20中的隔膜分别称为第一隔膜131及第二隔膜132。第一隔膜131及第二隔膜132为绝缘膜，能 够起到防止短路的作用。
在本实施例中，第一放料装置410包括阴极放卷机构411、第一隔膜放卷机构4412及第一复合机构413。
阴极放卷机构411用于放卷阴极极片110；第一隔膜放卷机构4412用于放卷第一隔膜131。阴极放卷机构411及第一隔膜放卷机构4412均可采用放卷轴的形式，阴极极片110及第一隔膜131能够以料带的形式分别卷绕于阴极放卷机构411及第一隔膜放卷机构4412上，并由阴极放卷机构411及第一隔膜放卷机构4412实现连续放卷。
第一复合机构413能够接收阴极极片110及第一隔膜131并进行复合，以得到第一复合料带10。具体在本实施例中，第一复合机构413包括上压辊(图未标)及下压辊(图未标)，阴极极片110及第一隔膜131能够穿过上压辊与下压辊之间。
上压辊及下压辊均能够绕自身的轴线转动，且其中一个与驱动组件连接，能够主动旋转。阴极极片110及第一隔膜131穿过时，上压辊与下压辊配合能够将阴极极片110及第一隔膜131夹紧。随着上压辊及下压辊转动，阴极极片110及第一隔膜131被压合成型得到第一复合料带10，而得到的第一复合料带10则能够在第一复合机构413的驱动下向下游输送。其中，上压辊及下压辊均可采用热压辊，从而使第一复合料带10热压成型。显然，在其他实施例中，第一复合料带10也可通过冷压的方式成型。
如此，第一复合料带10能够在阴极极片110及第一隔膜131连续放卷的过程中实时制备，有助于提升效率。需要指出的是，在其他实施例中，第一复合料带10也可以预先制备并在需要时由第一放料装置410直接进行放卷。
在本实施例中，第二放料装置430包括阳极放卷机构431、第二隔膜放卷机 构432及第二复合机构433。其中，阳极放卷机构431用于放卷阳极极片120；第二隔膜放卷机构432用于放卷第二隔膜132；第二复合机构433能够接收阳极极片120及第二隔膜132并进行复合，以得到第二复合料带20。
阳极放卷机构431、第二隔膜放卷机构432及第二复合机构433的结构可分别与阴极放卷机构411、第一隔膜放卷机构4412及第一复合机构413完全相同，故在此不再赘述。
进一步的，极片处理装置420能够在第一复合料带10的阴极极片110上形成断裂缝103(见图5)。断裂缝103沿阴极极片110的宽度方向延伸，能够将阴极极片110断开。可见，断裂缝103所在的区域不存在正极活性物质。
卷绕装置440包括卷针机构441。其中，卷针机构441能够将第一复合料带10及第二复合料带20卷绕成电芯100。卷绕得到的电芯100大致呈圆柱形或椭圆形，经过压制后可得到扁平结构。该扁平结构的电芯100具有平直区101及弯折区102。其中，电芯100的具体构造及平直区101及弯折区102的定义已在前文进行详细描述，故在此不再赘述。
在本实施例中，卷绕装置440还包括转盘442，多个卷针机构441设置于转盘442，转盘442转动可带动多个卷针机构441依次转移至能够获取第一复合料带10及第二复合料带20的位置。
转盘442可以连接电机等驱动机构，并能够在驱动机构的驱使下每次转动一定角度。在前一个电芯100卷绕完毕后，转盘442旋转并将下一个卷针机构441旋转至卷绕工位(即，能够获取第一复合料带10及第二复合料带20的位置)；接着，该下一个卷针机构441伸出并夹紧第一复合料带10及第二复合料带20；待前一个电芯100从料带末端切断后，下一个卷针机构441便可进行卷绕以进行下一个电芯100的制备。以此类推，多个卷针机构441能够交替进入卷绕工 位并进行电芯卷绕，从而能够提升生产节拍以减少等待时间，进而提升生产效率。
在所制得的电芯100中，阴极极片110的断裂缝103位于弯折区102。也就是说，电芯100位于弯折区102的至少部分阴极极片110具有断裂缝103。由于断裂缝103对应的区域不存在正极活性物质层，不存在锂离子，故位于弯折区102的阴极极片110上能够脱嵌的锂离子的数量将显著减少。因此，即使相邻的阳极极片120在弯折过程中发生了“掉粉”，但由于阴极极片110可脱嵌的锂离子的数量也同样减少，故也能避免阳极极片120的负极活性物质层的嵌锂位远少于相邻的阴极极片110的正极活性物质层能够提供的锂离子数量，从而能够降低或避免析锂现象的发生。
在进行卷绕之前，第一隔膜131与阴极极片110复合形成第一复合料带10，第二隔膜132与阳极极片120复合形成第二复合料带20。如此，可减少进入卷绕装置440的料带的数量，从而避免在卷绕过程中极片与隔膜的相对位置发生波动，保证所制得的电芯100中各膜层具有较高的对齐度且不易错位，并方便控制张力以利于设备提速。
具体在本实施例中，极片处理装置420包括夹送机构421及切割机构422，夹送机构421及切割机构422均设置于阴极放卷机构411与第一复合机构413之间。夹送机构421能够夹紧并输送阴极极片110，切割机构422能够将夹送机构421与第一复合机构413之间的阴极极片110切断，夹送机构421能够将切断处拉开并形成断裂缝103。
具体的，夹送机构421可通过对输送速度进行调节，从而将切断处拉开。连续的阴极极片110料带在进入第一复合机构413前，先经过夹送机构421以及切割机构422。切割机构422将阴极极片110切断后，位于切断处上游的阴极 极片110在第一复合机构413内与第一隔膜131进行复合，且得到的第一复合料带10能够在第一复合机构413的驱使下保持匀速输送；此时，夹送机构421则减速或停止输送，如此便可将阴极极片110切断处的距离拉开，直至形成断裂缝103。接着，夹送机构421调速至与第一复合机构413同步，在将位于切断处下游的阴极极片110送入第一复合机构413的同时，辅助第一复合机构413驱使第一复合料带10继续向下游输送。
具体在本实施例中，夹送机构421包括夹板，夹板能够沿阴极极片110的输送方向上往复移动。阴极极片110被切断后，夹板能够夹住位于切断处下游的阴极极片110并能够随着阴极极片110移动。如此，能够避免被切断后的阴极极片110因端部悬空过长而产生下坠，保证阴极极片110能够顺利进入第一复合机构413内。
需要指出的是，在其他实施例中，切割机构422还可以采用凸模与凹模配合的方式对阴极极片110进行冲切，能够在阴极极片110上切除具有一定宽度的废料，从而在将阴极极片110切断的同时便可自然形成断裂缝103。如此，夹送机构421能够与第一复合机构413保持同步输送，无需通过夹送机构421的速度变化将阴极极片110切断处的距离拉开而形成断裂缝103。
阴极极片110可以形成一个或多个断裂缝103。在需要形成多个断裂缝103时，夹送机构421及切割机构422重复上述操作即可。
在本实施例中，极片处理装置420还包括贴胶机构423，贴胶机构423能够在阴极极片110的一侧粘接第一胶带150(见图5)，以将位于断裂缝103靠近夹送机构421一侧的阴极极片110粘接于第一隔膜131。
断裂缝103能够将阴极极片110分割成两个极片分段，而位于断裂缝103靠近夹送机构421一侧的阴极极片110则指的是其中一个极片分段的上游端。 上游端指的是第一复合料带10的输送方向的前端，譬如，第一复合料带10从左到右输送，则右端为上游端。第一复合料带10在进入卷绕装置440之前，一般还需要绕经过辊以改变方向。在绕经过辊时，极片分段的上游端容易翘起并脱离第一隔膜131。由于第一胶带150能够将极片分段的上游端粘接于第一隔膜131后，故在第一复合料带10绕经过辊时，阴极极片110将不会与第一隔膜131脱离。
如图5所示，第一胶带150的部分穿过断裂缝103与第一隔膜131粘接，另一部分则粘接于阴极极片110。第一胶带150可以在阴极极片110与第一隔膜131复合前粘接，也可在复合后粘接。
具体在本实施例中，贴胶机构423设于切割机构422与第一复合机构413之间。也就是说，贴胶机构423在阴极极片110与第一隔膜131复合前便完成贴胶。因此，在第一复合机构413对阴极极片110及第一隔膜131复合的过程中，第一胶带150还能够起到避免阴极极片110与第一隔膜131发生错位的作用。
进一步的，在本实施例中，贴胶机构423还能够在阴极极片110的一侧粘接第二胶带(图未示)，以将位于断裂缝103远离夹送机构421一侧的阴极极片110粘接于第一隔膜131。
如前所述，断裂缝103能够将阴极极片110分割成两个极片分段，而位于断裂缝103远离夹送机构421一侧的阴极极片110则指的是其中一个极片分段的下游端。下游端指的是第一复合料带10的输送方向的后端，譬如，第一复合料带10从左到右输送，则左端为下游端。第二胶带将极片分段的下游端粘接于第一隔膜131后，能够防止阴极极片110在输送过程中相对于第一隔膜131发生偏移，从而有利于提升电芯100的品质。
此外，在本实施例中，电芯制造设备400还包括第二极片处理装置(图未示)，第二极片处理装置用于在第二复合料带20的阳极极片120与断裂缝103对应的区域形成第二断裂缝(图未示)。
第二极片处理装置的结构可与极片处理装置420的结构完全相同，故在此不再赘述。同样的，阳极极片120对应第二断裂缝的位置不存在负极活性物质。因此，当阳极极片120在电芯100的弯折区102进行弯折时，能够有效地避免负极活性物质“掉粉”，从而避免所制得的电芯100中夹杂较多的粉末杂质，有利于提升电芯100的品质。
虽然，第二断裂缝的存在会在一定程度上减少位于弯折区102的阳极极片120上负极活性物质的含量，从而导致嵌锂位的数量减少。但是，在不形成第二断裂缝的情况下，这部分减少的负极活性物质在弯折时一般也会从阳极极片120的表面脱落。而且，第二断裂缝的存在能够减小阳极极片120弯折时的阻力，能够一定程度上避免第二断裂缝以外的其他部分发生“掉粉”。也就是说，第二断裂缝所导致的负极活性物质的损失相较于常规情况实际上是减少的。因此，第二断裂缝的设置还能够在一定程度上抑制析锂现象的发生。
上述电芯制造设备400，所制得的电芯100具有弯折区102及平直区101，且至少部分位于弯折区102的阴极极片110形成有断裂缝103。断裂缝103对应的区域不存在正极活性物质层，不存在锂离子，故位于弯折区102的阴极极片110上能够脱嵌的锂离子的数量将显著减少。因此，所制得的电芯100能够有效地抑制析锂现象产生。而且，第一隔膜131与阴极极片110复合形成第一复合料带10，第二隔膜132与阳极极片120复合形成第二复合料带20。如此，可减少进入卷绕装置440的料带的数量，从而避免在卷绕过程中极片与隔膜的相对位置发生波动，保证所制得的电芯100中各膜层具有较高的对齐度且不易错位， 并方便控制张力以利于设备提速。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对申请专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (20)

  1. 一种电芯，其特征在于，包括阴极极片、阳极极片及位于相邻的所述阴极极片与所述阳极极片之间的隔膜，所述阴极极片、所述阳极极片及所述隔膜经卷绕压制形成扁平结构，所述电芯具有平直区及位于所述平直区两端的弯折区，至少部分位于所述弯折区的所述阴极极片形成有沿宽度方向延伸的断裂缝。
  2. 根据权利要求1所述的电芯，其特征在于，所述断裂缝将所在的所述阴极极片分割成至少两个极片分段，至少两个所述极片分段通过连接件连接形成一体。
  3. 根据权利要求2所述的电芯，其特征在于，所述连接件为粘接于所述阴极极片的至少一侧，并覆盖所述断裂缝的胶带。
  4. 根据权利要求1所述的电芯，其特征在于，所述阴极极片每绕经一次所述弯折区能够形成一个弯折部，所述阴极极片由卷绕起始端到卷绕末端形成有多个所述弯折部，且由所述卷绕起始端到所述卷绕末端的第一个所述弯折部上形成有所述断裂缝。
  5. 根据权利要求1所述的电芯，其特征在于，由所述卷绕起始端到所述卷绕末端的前两个或前四个或前六个所述弯折部上均形成有所述断裂缝。
  6. 根据权利要求1至5任一项所述的电芯，其特征在于，至少部分位于所述弯折区的所述阳极极片与所述断裂缝对应的位置形成有第二断裂缝。
  7. 一种电池，其特征在于，包括壳体及如上述权利要求1至6任一项所述的电芯，所述电芯收容于所述壳体且所述壳体内填充有电解液。
  8. 一种电芯制造设备，其特征在于，包括：
    第一放料装置，用于提供阴极极片；
    极片处理装置，能够在所述阴极极片的预设区域形成断裂缝并设置连接件，所述断裂缝将所在的所述阴极极片分割成至少两个极片分段，至少两个所述极片分段通过所述连接件连接形成一体；
    第二放料装置，用于提供阳极极片；
    隔膜放料装置，用于在相邻的所述阴极极片与所述阳极极片之间设置隔膜；
    卷绕装置，包括卷针机构，所述卷针机构能够将所述阳极极片、所述阴极极片及所述隔膜卷绕成电芯；
    其中，所述电芯能够被压制成具有平直区及弯折区的扁平结构，所述预设区域位于所述弯折区。
  9. 根据权利要求8所述的电芯制造设备，其特征在于，所述极片处理装置包括：
    至少两个夹送机构，每个所述夹送机构均能够夹持并输送所述阴极极片；
    设于相邻两个所述夹送机构之间的切割机构，每个所述切割机构能够将所述阴极极片切断，以得到至少两个极片分段，至少两个所述夹送机构能够分别夹持至少两个所述极片分段并拉开相邻两个所述极片分段之间的距离以形成所述断裂缝；
    贴胶机构，能够将作为所述连接件的胶带粘贴于所述阴极极片的至少一侧并覆盖所述断裂缝，以将所述至少两个极片分段连接形成一体。
  10. 根据权利要求8所述的电芯制造设备，其特征在于，还包括第二极片处理装置，所述第二极片处理装置用于在所述阳极极片与所述预设区域对应的区域形成第二断裂缝。
  11. 一种电芯制造设备，其特征在于，包括：
    第一放料装置，包括阴极放卷机构、极片处理机构、第一隔膜放卷机构及第一复合机构，所述阴极放卷机构用于提供阴极极片，所述极片处理机构能够在所述阴极极片的预设区域形成断裂缝并设置连接件，所述断裂缝将所在的所述阴极极片分割成至少两个极片分段，至少两个所述极片分段通过所述连接件连接形成一体，所述第一隔膜放卷机构用于放卷第一隔膜，所述第一复合机构能够接收所述阴极极片及所述第一隔膜并进行复合，以得到第一复合料带；
    第二放料装置，包括阳极放卷机构、第二隔膜放卷机构及第二复合机构，所述阳极放卷机构用于提供阳极极片，所述第二隔膜放卷机构用于放卷第二隔膜，所述第二复合机构能够接收所述阳极极片及所述第二隔膜并进行复合，以得到第二复合料带；
    卷绕装置，包括卷针机构，所述卷针机构能够将所述第一复合料带及所述第二复合料带卷绕成电芯；
    其中，所述电芯能够被压制成具有平直区及弯折区的扁平结构，所述预设区域位于所述弯折区。
  12. 根据权利要求11所述的电芯制造设备，其特征在于，所述极片处理机构包括：
    至少两个夹送机构，每个所述夹送机构均能够夹持并输送所述阴极极片；
    设于相邻两个所述夹送机构之间的切割机构，每个所述切割机构能够将所述阴极极片切断，以得到至少两个极片分段，至少两个所述夹送机构能够分别夹持至少两个所述极片分段并拉开相邻两个所述极片分段之间的距离以形成所述断裂缝；
    贴胶机构，能够将作为所述连接件的胶带粘贴于所述阴极极片的至少一侧并覆盖所述断裂缝，以将所述至少两个极片分段连接形成一体。
  13. 一种电芯制造设备，其特征在于，包括：
    第一放料装置，用于提供第一复合料带，所述第一复合料带包括第一隔膜及覆设于所述第一隔膜的阴极极片；
    极片处理装置，能够在所述第一复合料带的所述阴极极片上形成断裂缝；
    第二放料装置，用于提供第二复合料带，所述第二复合料带包括第二隔膜及覆设于所述第二隔膜的阳极极片；及
    卷绕装置，包括卷针机构，所述卷针机构能够将所述第一复合料带及所述第二复合料带卷绕成电芯；
    其中，所述电芯能够被压制成具有平直区及弯折区的扁平结构，所述断裂缝位于所述弯折区。
  14. 根据权利要求13所述的电芯制造设备，其特征在于，所述第一放料装置包括：
    阴极放卷机构，用于放卷所述阴极极片；
    第一隔膜放卷机构，用于放卷所述第一隔膜；及
    第一复合机构，能够接收所述阴极极片及所述第一隔膜并进行复合，以得到所述第一复合料带。
  15. 根据权利要求14所述的电芯制造设备，其特征在于，所述极片处理装置包括设置于所述阴极放卷机构与所述第一复合机构之间的夹送机构及切割机构，所述夹送机构能够夹紧并输送所述阴极极片，所述切割机构能够将所述夹送机构与所述第一复合机构之间的所述阴极极片切断，所述夹送机构能够将切断处拉开并形成所述断裂缝。
  16. 根据权利要求15所述的电芯制造设备，其特征在于，所述极片处理装 置还包括贴胶机构，所述贴胶机构能够在所述阴极极片的一侧粘接第一胶带，以将位于所述断裂缝靠近所述夹送机构一侧的所述阴极极片粘接于所述第一隔膜。
  17. 根据权利要求16所述的电芯制造设备，其特征在于，所述贴胶机构还能够在所述阴极极片的一侧粘接第二胶带，以将位于所述断裂缝远离所述夹送机构一侧的所述阴极极片粘接于所述第一隔膜。
  18. 根据权利要求14所述的电芯制造设备，其特征在于，所述第一复合机构包括上压辊及下压辊，所述阴极极片及所述第一隔膜能够穿过所述上压辊与所述下压辊之间。
  19. 根据权利要求13所述的电芯制造设备，其特征在于，所述第二放料装置包括：
    阳极放卷机构，用于放卷所述阳极极片；
    第二隔膜放卷机构，用于放卷所述第二隔膜；及
    第二复合机构，能够接收所述阳极极片及所述第二隔膜并进行复合，以得到所述第二复合料带。
  20. 根据权利要求13所述的电芯制造设备，其特征在于，还包括第二极片处理装置，所述第二极片处理装置用于在所述第二复合料带的所述阳极极片与所述断裂缝对应的区域形成第二断裂缝。
PCT/CN2023/072043 2022-03-01 2023-01-13 电芯、电池及电芯制造设备 Ceased WO2023165279A1 (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN120453516A (zh) * 2025-07-14 2025-08-08 宁德时代新能源科技股份有限公司 电极组件的制造方法、电极组件、电池单体及相关装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101901934A (zh) * 2010-07-22 2010-12-01 黄祥盛 一种卷绕式叠片方形锂离子电芯及其制备方法
JP2012190542A (ja) * 2011-02-21 2012-10-04 Denso Corp 捲回型電池、その製造方法および製造装置
JP2018056434A (ja) * 2016-09-30 2018-04-05 旭化成株式会社 非水系リチウム型蓄電素子
CN217740615U (zh) * 2022-03-01 2022-11-04 无锡先导智能装备股份有限公司 电芯成型设备及电芯
CN217740729U (zh) * 2022-03-01 2022-11-04 无锡先导智能装备股份有限公司 电芯成型设备及电芯

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101901934A (zh) * 2010-07-22 2010-12-01 黄祥盛 一种卷绕式叠片方形锂离子电芯及其制备方法
JP2012190542A (ja) * 2011-02-21 2012-10-04 Denso Corp 捲回型電池、その製造方法および製造装置
JP2018056434A (ja) * 2016-09-30 2018-04-05 旭化成株式会社 非水系リチウム型蓄電素子
CN217740615U (zh) * 2022-03-01 2022-11-04 无锡先导智能装备股份有限公司 电芯成型设备及电芯
CN217740729U (zh) * 2022-03-01 2022-11-04 无锡先导智能装备股份有限公司 电芯成型设备及电芯

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN120453516A (zh) * 2025-07-14 2025-08-08 宁德时代新能源科技股份有限公司 电极组件的制造方法、电极组件、电池单体及相关装置

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