WO2024077653A1 - 电池盖板及动力电池 - Google Patents

电池盖板及动力电池 Download PDF

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Publication number
WO2024077653A1
WO2024077653A1 PCT/CN2022/126555 CN2022126555W WO2024077653A1 WO 2024077653 A1 WO2024077653 A1 WO 2024077653A1 CN 2022126555 W CN2022126555 W CN 2022126555W WO 2024077653 A1 WO2024077653 A1 WO 2024077653A1
Authority
WO
WIPO (PCT)
Prior art keywords
pole
battery
bracket
top cover
insulating
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/CN2022/126555
Other languages
English (en)
French (fr)
Chinese (zh)
Inventor
林陈能
陈利权
宋帅帅
龚利
伍山松
宋冬梅
吴磊
谭津
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.)
Eve Power Co Ltd
Original Assignee
Eve Power 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
Application filed by Eve Power Co Ltd filed Critical Eve Power Co Ltd
Priority to JP2023552514A priority Critical patent/JP7690046B2/ja
Priority to EP22929207.3A priority patent/EP4376204A4/en
Priority to US18/242,374 priority patent/US20240234986A9/en
Publication of WO2024077653A1 publication Critical patent/WO2024077653A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/595—Tapes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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

Definitions

  • the present application relates to the field of battery technology, for example, to a battery cover and a power battery.
  • the battery includes a shell, a core pack with a tab and a cover plate.
  • the core pack is placed in the accommodation space formed by the shell and the cover plate.
  • the core pack is placed in the shell, the tab is flattened by ultrasonic welding, and then laser welded to the battery cover plate.
  • the cover plate is fixed to the shell, and the tab is bent and arranged between the cover plate and the battery cell, which can maximize the internal space utilization.
  • the cover is closed, there is a problem that the tab shaping area is inserted into the core pack backwards, causing a short circuit.
  • the present application provides a battery cover and a power battery, which solve the problem of the shaped area of the pole ear being inserted inverted into the core package, avoid short circuit, and improve the safety and reliability of the power battery.
  • an embodiment of the present application provides a battery cover, comprising:
  • a top cover assembly used for being fixedly connected to the shell, the shell and the top cover assembly form a receiving space for receiving the core package, and the top cover assembly is used for welding with the pole lug on the core package;
  • An insulating support is accommodated in the accommodation space.
  • the insulating support and the top cover assembly form an accommodation cavity for accommodating the pole ear.
  • the insulating support is provided with a notch for the pole ear to pass through.
  • the top cover assembly is detachably connected to the insulating bracket.
  • the insulating support includes two support bodies, the two support bodies are respectively connected to the top cover assembly, and the gap is formed between the two support bodies.
  • the notch is provided with a rounded corner or a chamfered corner along the thickness direction of the insulating support.
  • a welding mark is provided on the tab, and the welding mark is covered with insulating glue.
  • the accommodating cavity is a rectangular parallelepiped cavity.
  • the tab is bent in a Z-shape and disposed in the accommodating cavity.
  • the insulating support abuts against the core package.
  • the insulating support is provided with a through hole communicating with the accommodating cavity.
  • the core package is coated with a protective film
  • the outer part of the housing is coated with a protective film; and/or
  • the tab sticker is provided with protective glue.
  • the top cover assembly comprises:
  • a cover plate, the cover plate is fixedly connected to the shell;
  • the upper plastic and the lower plastic are fixedly arranged on two sides of the cover plate, and the lower plastic is connected to the insulating bracket;
  • a pole is penetrated through the upper plastic, the cover plate and the lower plastic, and the pole is welded to the pole ear.
  • the lower plastic and/or the insulating support are provided with a groove, and the lower plastic and the insulating support form a receiving cavity.
  • the notch is arranged toward the lower pole block at the end of the pole.
  • an embodiment of the present application provides a power battery, comprising a shell, a core pack and the above-mentioned battery cover plate, wherein the core pack and the insulating bracket are accommodated in an accommodating space, the pole tabs of the core pack are welded to the top cover assembly, and the pole tabs are accommodated in the accommodating cavity.
  • the present application provides a battery cover and a power battery, in which a core pack and an insulating bracket are accommodated in a accommodating space, the pole ears of the core pack are welded to the top cover assembly, and the pole ears are accommodated in an accommodating cavity.
  • the accommodating cavity provides a space occupied by the pole ears to avoid scattering between the core pack and the top cover assembly, and has good structural stability; the insulating bracket effectively isolates the pole ears from the core pack, solves the problem of the pole ears being inserted upside down into the core pack due to shaping, avoids short circuits, improves the safety and reliability of the power battery, and improves the yield rate.
  • FIG1 is a front view of a power battery provided in a specific embodiment of the present application.
  • FIG2 is a side view of FIG1;
  • FIG3 is a schematic structural diagram of a battery cover provided in a specific embodiment of the present application.
  • FIG4 is a bottom view of FIG3
  • Fig. 5 is a cross-sectional view taken along line A-A of Fig. 4;
  • FIG6 is an exploded view of the battery cover at one viewing angle
  • FIG. 7 is an exploded view of the battery cover from another perspective.
  • Top cover assembly 11. Cover plate; 12. Upper plastic; 13. Lower plastic; 131. Card slot; 132. Groove; 14. Pole; 141. Lower pole block; 15. Insulating cover; 16. Insulating plate; 17. Liquid injection hole;
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.
  • connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.
  • a first feature being “above” or “below” a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact.
  • a first feature being “above”, “above”, and “above” a second feature may include the first feature being directly above and obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature.
  • a first feature being “below”, “below”, and “below” a second feature may include the first feature being directly below and obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
  • the present embodiment provides a power battery, as shown in FIG. 1 to FIG. 5 , which includes a shell 3, a core pack 4 and a battery cover.
  • the present embodiment also provides a battery cover, including a top cover assembly 1 and an insulating bracket 2, the top cover assembly 1 is used to be fixedly connected to the shell 3, the shell 3 and the top cover assembly 1 form a receiving space for receiving the core pack 4, and the top cover assembly 1 is used to be welded with the pole lug 41 on the core pack 4; the insulating bracket 2 is received in the receiving space, the insulating bracket 2 and the top cover assembly 1 form a receiving cavity P for receiving the pole lug 41, and the insulating bracket 2 is provided with a notch 23 for the pole lug 41 to pass through.
  • the core pack 4 and the insulating bracket 2 are accommodated in the accommodating space, the pole ear 41 of the core pack 4 is welded to the top cover assembly 1, and the pole ear 41 is accommodated in the accommodating cavity P.
  • the accommodating cavity P provides a space occupied by the pole ear 41 to prevent the pole ear 41 from being scattered between the core pack 4 and the top cover assembly 1, and the structural stability is good; the insulating bracket 2 effectively isolates the pole ear 41 and the core pack 4, and solves the problem that the shaped area of the pole ear 41 is invertedly inserted into the core pack 4 due to the shaping of the pole ear 41, thereby avoiding short circuit, improving the safety and reliability of the power battery, and improving the yield rate.
  • the power battery is a blade battery. In another embodiment, the power battery may be other batteries without limitation.
  • the top cover assembly 1 includes a cover plate 11, an upper plastic 12, a lower plastic 13 and a pole 14.
  • the cover plate 11 is fixedly connected to the housing 3; the upper plastic 12 and the lower plastic 13 are respectively fixed on both sides of the cover plate 11, and the lower plastic 13 is connected to the insulating bracket 2; the pole 14 is penetrated by the lower plastic 13, the cover plate 11 and the upper plastic 12, and the pole 14 is welded to the pole ear 41.
  • the cover plate 11 is generally an aluminum plate, and the upper plastic 12 and the lower plastic 13 are provided to prevent short circuit.
  • a lower pole block 141 is provided on the side of the pole 14 facing the core package 4, and the cross-sectional area of the lower pole block 141 is large to increase the connection area with the pole ear 41 and improve the structural reliability; in one embodiment, the notch 23 is provided toward the lower pole block 141 at the end of the pole 14, so that the pole ear 41 can pass through the notch 23 after being welded to the lower pole block 141.
  • the lower plastic 13 is provided with a groove 132, and the lower plastic 13 and the insulating bracket 2 form a receiving chamber P. In another embodiment, the insulating bracket 2 may also be provided with a groove 132 to form the receiving chamber P.
  • the lower plastic 13 and the insulation may be provided with grooves 132 to form the receiving chamber P.
  • the specific setting is made according to the actual situation and is not limited.
  • the lower plastic 13 is not retained in the lower pole block 141 area to prevent the lower plastic 13 from affecting the welding of the lower pole block 141 and the pole ear 41; in one embodiment, the receiving chamber P is a rectangular parallelepiped cavity, which increases the receiving space and facilitates the arrangement of the pole ear 41.
  • the length of the notch 23 the width of the pole ear 41 + 2 to 5 mm
  • the depth of the notch 23 the thickness of the pole ear 41 + 1 to 2 mm.
  • the notch 23 is provided with a fillet or chamfer 231 along the thickness direction of the insulating support 2 to avoid the formation of a flash at the notch 23 , which can effectively prevent the core package 4 from being cut by the flash in a high-intensity vibration application scenario.
  • the size of the fillet or chamfer 231 can be, but is not limited to, 0.2, 0.4, 0.6, 0.8 mm or 1.0 mm.
  • the height correction coefficient of the lower plastic 13 is adjusted in the range of 1.5-2.5.
  • the height correction coefficient of the lower plastic 13 is adjusted in the range of 1.2-2.0.
  • the top cover assembly 1 is detachably connected to the insulating bracket 2 to prevent the insulating bracket 2 from falling off during the assembly of the core package 4, improve the connection stability and reliability, and facilitate disassembly and assembly.
  • the insulating bracket 2 is covered on the lower plastic 13, and the insulating bracket 2 and the lower plastic 13 are snap-connected; in this embodiment, a card slot 131 is provided on the lower plastic 13, and a buckle 24 is provided on the insulating bracket 2, and the buckle 24 is snap-connected to the card slot 131; in other embodiments, a card slot 131 may also be provided on the insulating bracket 2, and a buckle 24 may be provided on the lower plastic 13, without limitation.
  • multiple groups of card slots 131 and buckles 24 are provided, and the number may be but is not limited to 4, 6, or 8, symmetrically distributed on both sides of the lower plastic 13 and the insulating bracket 2.
  • the top cover assembly 1 further includes an insulating sealing ring, which is disposed between the pole 14 and the cover plate 11 to ensure the sealing of the accommodating space and avoid short circuit.
  • a liquid injection hole 17 is provided on the top cover assembly 1.
  • electrolyte is injected into the accommodating space through the liquid injection hole 17.
  • the electrolyte is a channel for ion transfer.
  • the top cover assembly 1 also includes a seal 5 that blocks the liquid injection hole 17 to prevent electrolyte leakage.
  • the seal 5 includes sealing rubber particles and a sealing aluminum sheet. The sealing rubber particles match the liquid injection hole 17 and are inserted into the liquid injection hole 17 to enhance the sealing effect of the core package 4. The sealing aluminum sheet is used to weld and seal the liquid injection hole 17.
  • the top cover assembly 1 further includes an insulating plate 16 , which is disposed on a side of the upper plastic 12 away from the cover plate 11 to improve structural reliability.
  • the housing 3 may be an aluminum housing
  • the cover plate 11 may be an aluminum plate
  • the cover plate 11 and the housing 3 are welded
  • pre-spot welding is performed during welding
  • the number of pre-spot welding points may be but is not limited to 6EA, 8EA, 10EA
  • the number of pre-spot welding points is symmetrically distributed.
  • the top cover assembly 1 further includes an insulating cover sheet 15, which is attached to the cover plate 11 to prevent a short circuit between the pole 14 and the cover plate 11 due to an external connection.
  • the core package 4 is coated with a protective film; the outer shell 3 is coated with a protective film to provide insulation.
  • the core package 4 after ultrasonic welding of the positive and negative electrode tabs 41 is wrapped with a protective film to prevent the core package 4 from being scratched when entering the shell.
  • the inner protective film is an insulating, high temperature resistant, and electrolyte corrosion resistant polymer material, which can be, but is not limited to, a PET sheet with adhesive on one side.
  • the tab 41 is provided with protective glue for insulation design, which can effectively prevent short circuit between the tab 41 and the aluminum shell 3.
  • the core package 4 with the protective film is pasted with adhesive tape at the tab 41, the width of the adhesive tape exceeds the width of the tab 41 by 2 to 10 mm, the length of the adhesive tape wrapped on the core package 4 is 5 to 25 mm, and the distance between the adhesive tape and the tab 41 is 0 to 5 mm from the weld print area.
  • the protective glue of the tab 41 can ensure that the battery core is completely insulated at the aluminum shell after being placed in the shell.
  • positive and negative electrode ears 41 are provided on the core package 4, and the core package 4 contains positive and negative electrode active materials, positive and negative electrode current collectors, and a diaphragm.
  • the active material is a solid-phase reaction interface for the battery to perform electrochemical reactions.
  • the current collector provides an electron channel for electron transfer after gaining or losing electrons, and the diaphragm acts as an electron isolation to allow ions to pass through.
  • a weld mark is provided on the pole lug 41.
  • the pole lug 41 can be flattened by flat-tooth ultrasonic welding. Compared with other deep-tooth welding, ultrasonic flat-tooth welding has a larger weld mark area and is flatter. Then, laser welding is used to weld the flattened pole lug 41 to the lower plate of the top cover, which can enhance the welding strength between the pole lug 41 and the top cover assembly 1, and can improve the current carrying capacity of the battery, and the welding reliability is high.
  • Each layer of pole lug 41 is welded, and the size of the weld mark matches the size of the weld line when the pole lug 41 is laser welded to the cover plate 11.
  • the size of ultrasonic flat welding can be but not limited to 10mm*20mm, 15mm*20mm or 10mm*30mm, and the number of weld marks can be but not limited to 1EA, 2EA, 3EA.
  • One weld mark is used as much as possible under the condition that the weld mark area allows.
  • the number of core packs 4 can be but not limited to 1EA, 2EA, 3EA. Usually, the number of core packs 4 of blade batteries does not exceed 2EA.
  • the insulating bracket 2 is installed, which is conducive to the insulating bracket 2 to effectively fix the shaped tab 41 in the receiving cavity P of the insulating bracket 2 and the lower plastic 13.
  • the tab 41 is bent in a Z shape and arranged in the receiving cavity P, so that the tab 41 is gathered together, which is convenient for installing the shaped tab 41 into the receiving cavity P when the bracket is installed.
  • the insulating bracket 2 abuts against the core package 4 to fix the core package 4, thereby ensuring that the core package 4 does not shake and improving reliability.
  • the insulating bracket 2 includes two bracket bodies, and the two bracket bodies are respectively connected to the top cover assembly 1, and a notch 23 is formed between the two bracket bodies.
  • a recess may be provided on only one of the bracket bodies so that a notch 23 is formed between the two bracket bodies, or recesses may be provided on both bracket bodies so that a notch 23 is formed between the two bracket bodies.
  • Both bracket bodies are detachably connected to the lower plastic 13 to improve the connection reliability.
  • a first bracket 21 and a second bracket 22 may be provided to distinguish the two bracket bodies.
  • the first bracket 21 and the second bracket 22 are of different sizes, so that the position where the notch 23 is formed is offset accordingly.
  • the setting can be made according to the actual situation without limitation.
  • the matching setting is made according to the position when the pole ear 41 is folded, without limitation.
  • the first bracket 21 and the second bracket 22 may be made of the same material or different materials.
  • the insulating bracket 2 is made of a material with sufficient hardness and resistance to electrolyte corrosion and high temperature. It can be but not limited to PP material, and the thickness can be but not limited to 0.5mm, 1.0mm, 1.5mm, 2.0mm, and the height of the upper bracket matches the height of the lower plastic 13.
  • the insulating bracket 2 is provided with a through hole 25 connected to the accommodating cavity P.
  • the shape of the through hole 25 can be but not limited to circular or square.
  • the design of the through hole 25 is conducive to the free flow of the electrolyte in the internal space of the battery cell.
  • the present embodiment provides a manufacturing process of a core package 4, including: the first step of positive and negative electrode homogenization, which is to evenly disperse the positive and negative electrode active materials with the conductive agent and the binder in a certain mass ratio in the solvent; the second step of positive and negative electrode coating, which is to stably coat the evenly dispersed positive and negative electrode slurries on the positive and negative electrode collectors; the third step of positive and negative electrode sheeting, which is to roll the coated positive and negative electrode sheets to a specified thickness and then cut them into specified sizes; the fourth step of winding (or laminating) assembly, which is to wind (or laminate) the prepared positive and negative electrode sheets into a core package 4 and assemble them; the fifth step of baking, which is to bake the assembled battery in a vacuum oven to a specified moisture value; the sixth step of liquid injection, which is to inject the electrolyte into the battery and let it stand until the electrolyte completely infiltrates the electrode sheets; the seventh step of formation, which is to activate the battery formation and
  • This embodiment provides an assembly process of a power battery, including:
  • the pole ear 41 is bent and shaped.
  • the welded pole ear 41 is bent and shaped in a "Z" shape.
  • the cover plate 11 is fully welded.
  • the cover plates 11 of the positive and negative electrodes of the battery cell are welded to the shell 3 by laser welding to ensure that the welding area is completely sealed.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Cell Separators (AREA)
  • Battery Mounting, Suspending (AREA)
PCT/CN2022/126555 2022-10-11 2022-10-21 电池盖板及动力电池 Ceased WO2024077653A1 (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2023552514A JP7690046B2 (ja) 2022-10-11 2022-10-21 バッテリーカバー及びパワーバッテリー
EP22929207.3A EP4376204A4 (en) 2022-10-11 2022-10-21 BATTERY COVER PLATE AND POWER BATTERY
US18/242,374 US20240234986A9 (en) 2022-10-11 2023-09-05 Battery covers and power batteries

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CN202222673198.2U CN218472105U (zh) 2022-10-11 2022-10-11 电池盖板及动力电池
CN202222673198.2 2022-10-11

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JP7690046B2 (ja) 2025-06-09
US20240234986A9 (en) 2024-07-11
EP4376204A1 (en) 2024-05-29
US20240136681A1 (en) 2024-04-25
JP2024537947A (ja) 2024-10-18
CN218472105U (zh) 2023-02-10
EP4376204A4 (en) 2024-10-23

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