WO2024032225A1 - Ensemble couvercle supérieur de batterie, batterie secondaire et module de stockage d'énergie - Google Patents

Ensemble couvercle supérieur de batterie, batterie secondaire et module de stockage d'énergie Download PDF

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Publication number
WO2024032225A1
WO2024032225A1 PCT/CN2023/104115 CN2023104115W WO2024032225A1 WO 2024032225 A1 WO2024032225 A1 WO 2024032225A1 CN 2023104115 W CN2023104115 W CN 2023104115W WO 2024032225 A1 WO2024032225 A1 WO 2024032225A1
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WO
WIPO (PCT)
Prior art keywords
sealing
hole
top cover
positioning
hole section
Prior art date
Application number
PCT/CN2023/104115
Other languages
English (en)
Chinese (zh)
Inventor
黄达
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2024032225A1 publication Critical patent/WO2024032225A1/fr

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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H01M50/645—Plugs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/668—Means for preventing spilling of liquid or electrolyte, e.g. when the battery is tilted or turned over
    • 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 energy storage technology, and in particular to a battery top cover assembly, a secondary battery and an energy storage module.
  • Lithium-ion batteries have been widely used in the 3C industry and new energy due to their advantages of high energy density, high voltage platform, small size, low self-discharge, long life, no memory effect and environmental friendliness. Power industry, energy storage industry, etc.
  • lithium-ion batteries on the market come in cuboid, cylindrical, etc. shapes.
  • the battery top cover is one of the important components of lithium-ion batteries.
  • a liquid injection hole is provided on the top cover of the battery, and the liquid injection hole can be connected to an electrolyte injection pipe.
  • the electrolyte enters the accommodation cavity of the battery case through the injection pipe and the injection hole. After completing the refilling operation of the lithium-ion battery, the filling hole needs to be sealed.
  • An existing method of sealing the liquid injection hole is as follows: the sealing steel column and the liquid injection hole are spaced together so that the battery top cover and the sealing steel ball can be tightly combined to achieve a sealing effect.
  • the steel balls will cause elastic and plastic deformation of the battery top cover when they are pressed or smashed into the injection hole, after long-term use of the lithium-ion battery, the long-term plastic deformation of the battery top cover will lead to fatigue failure, causing The sealing effect of the sealed steel column on the liquid injection hole gradually decreases, and there may even be a risk of leakage, which in turn shortens the service life of the battery.
  • the embodiment of the present application provides a battery top cover assembly, a secondary battery and an energy storage module, which solves the problem in the prior art that the sealing effect of the sealing steel pillar on the liquid injection hole of the top cover is reduced and prone to occur after the battery is used for a long time. The issue of leakage risk.
  • embodiments of the present application provide a top cover assembly of a battery.
  • the top cover assembly includes a top cover, a sealing nail and a sealing cover.
  • a liquid injection hole is provided on the top cover.
  • the above-mentioned sealing nail is used for sealing connection with the liquid injection hole.
  • the sealing nail can be nailed into the liquid injection hole through external force, so that the liquid injection hole undergoes elastic deformation and plastic deformation, and is sealed with the sealing nail.
  • a liquid blocking boss is formed on the upper surface of the top cover at the liquid injection hole along the circumferential direction of the liquid injection hole.
  • the inner wall of the liquid retaining boss can enclose a receiving hole, and the receiving hole is connected with the liquid injection hole. Since the liquid-blocking boss is formed on the outer periphery of the liquid injection hole, the diameter of the accommodating hole enclosed by the inner wall of the liquid-blocking boss is larger than the diameter of the liquid injection hole.
  • the above-mentioned sealing cover can be accommodated in the accommodation hole and sealingly connected with the accommodation hole. Thereby, the sealing of the liquid injection hole is further achieved.
  • the sealing connection between the above-mentioned sealing nail and the liquid injection hole can be regarded as the first sealing structure.
  • the sealing cover is sealingly connected to the accommodation hole and can be regarded as a second sealing structure. Therefore, the embodiment of the present application achieves sealing at the liquid injection hole through two sealing structures. Even if the sealing effect of the sealing nail on the liquid injection hole is reduced after long-term use of the battery, or the sealing nail and the liquid injection hole are misaligned during installation, resulting in poor sealing effect, the second sealing structure can still ensure the sealing of the liquid injection hole. sex. Therefore, leakage problems can be avoided.
  • the liquid blocking boss can also prevent the electrolyte from overflowing at the liquid injection hole.
  • it avoids the electrolyte from overflowing into the explosion-proof device and causing corrosion to the explosion-proof device, and avoids the electrolyte from overflowing into the pole assembly, causing the pole assembly and the top cover to overlap and causing the risk of short circuit.
  • the safety performance of the battery is improved.
  • the above-mentioned sealing cover and the accommodation hole are connected by welding. Specifically, it can be laser welding.
  • the connection between the sealing cover and the accommodation hole has high strength and good sealing performance.
  • the above-mentioned top cover, liquid-retaining boss and sealing cover can be made of the same material, such as the top cover, the liquid-retaining boss and the sealing cover.
  • the table and sealing cover are made of aluminum.
  • the outer diameter D 1 of the above-mentioned sealing cover and the diameter D 2 of the accommodation hole satisfy: 0.9D 2 ⁇ D 1 ⁇ D 2 .
  • the liquid injection hole is a stepped hole.
  • the liquid injection hole includes interconnected sealing hole sections and positioning hole sections.
  • the sealing hole section is located below the positioning hole section.
  • the sealing hole section is used for sealing connection with the sealing nail.
  • the diameter of the positioning hole section is larger than the diameter of the sealing hole section, and the diameter of the sealing nail is smaller than the diameter of the positioning hole section. Therefore, the positioning hole section will not affect the sealing connection between the sealing nail and the sealing hole section.
  • the lower surface of the sealing cover is provided with a positioning boss at a position corresponding to the positioning hole section.
  • the positioning boss of the sealing cover can abut against the hole wall of the positioning hole section. Therefore, the height positioning of the sealing cover and the installation position on the top cover are achieved, and the problem of excessive one-side deviation of the sealing cover in the accommodating hole is avoided.
  • the sealing cover is welded to the hole wall of the accommodation hole in the top cover, the welding thermal stress generated by the welding operation will drive the sealing cover to move.
  • the positioning boss of the sealing cover can squeeze the positioning hole section of the liquid injection hole. Therefore, the welding thermal stress generated during the welding process of the sealing cover can be transferred to the extrusion force between the positioning boss and the sealing cover.
  • the sealing cover will not move left and right, which can effectively improve the welding yield.
  • the diameters of the above-mentioned positioning hole segments from top to bottom are all equal. Therefore, the positioning hole segment is cylindrical.
  • the processing operation of the liquid injection hole is more convenient.
  • the positioning boss on the sealing cover is also cylindrical.
  • the hole wall of the above-mentioned positioning hole section is a slope. Moreover, the diameter of the positioning hole section decreases sequentially from top to bottom. Therefore, the positioning hole section is in the shape of a rounded cone. The processing operation of the positioning hole section with a truncated cone shape is also more convenient.
  • the outer wall of the positioning boss on the sealing cover is also a slope, and the diameter of each area on the outer wall of the positioning boss decreases from top to bottom.
  • the positioning boss is also in the shape of an inverted frustum.
  • the inclination angle ⁇ of the hole wall of the positioning hole segment and the inclination angle ⁇ of the outer wall of the positioning boss satisfy: ⁇ > ⁇ , and ⁇ - ⁇ 5°. Therefore, it is ensured that the contact area between the outer wall of the positioning boss and the hole wall of the positioning hole section is large, and at the same time, the positioning boss can effectively alleviate the welding thermal stress generated during the welding process of the sealing cover.
  • the above-mentioned positioning structure in the liquid injection hole can also be used to position the height position of the sealing nail.
  • the sealing nail includes sealing nail segments and locating nail segments.
  • the diameter of the positioning nail segment is larger than the diameter of the sealing nail segment.
  • the sealing nail section can be sealingly connected with the sealing hole section of the liquid injection hole, and the positioning nail section can abut against the positioning hole section. Therefore, by correspondingly abutting the positioning nail section and the positioning hole section, the sealing nail can be limited to a set height position, thereby realizing the height positioning of the sealing nail.
  • the above-mentioned positioning hole section for positioning the sealing nail can also be cylindrical or inverted truncated cone shape.
  • embodiments of the present application provide a secondary battery, which includes a case and a top cover assembly of the battery described in the above embodiments.
  • An accommodation cavity is formed in the housing.
  • An opening is provided on the top of the housing, and the opening is connected with the accommodation cavity.
  • the top cover in the top cover assembly is closed at the opening to close the housing.
  • the liquid injection hole on the top cover can be connected with the accommodation cavity of the housing. Since the top cover assembly of the secondary battery in the embodiment of the present application has the same structure as the top cover assembly of the battery described in the above embodiment, both can solve the same technical problem and obtain the same technical effect, and will not be described again here. .
  • inventions of the present application provide an energy storage module.
  • the energy storage module includes a box and a plurality of secondary batteries described in the above embodiments. Multiple secondary batteries are fixedly installed in the box, and the multiple secondary batteries can be electrically connected in sequence. A plurality of secondary batteries may be connected in parallel or in series. Alternatively, some of the secondary batteries are connected in series and the remaining secondary batteries are connected in parallel. Since the secondary battery in the energy storage module of the embodiment of the present application has the same structure as the secondary battery described in the above embodiment, both can solve the same technical problem and obtain the same technical effect, which will not be described again here.
  • FIG. 1 is a schematic structural diagram of an energy storage module according to an embodiment of the present application.
  • Figure 2 is one of the structural schematic diagrams of a secondary battery according to an embodiment of the present application.
  • Figure 3 is a schematic structural diagram of the top cover assembly of the secondary battery according to the embodiment of the present application.
  • Figure 4 is a partial cross-sectional view of a secondary battery according to an embodiment of the present application.
  • Figure 5 is one of the schematic cross-sectional views of a liquid injection port in a secondary battery
  • Figure 6 is a second schematic cross-sectional view of the liquid injection port in a secondary battery
  • Figure 7 is the second structural schematic diagram of the secondary battery according to the embodiment of the present application.
  • Figure 8 is a partial cross-sectional view of the top cover at the liquid filling port of the secondary battery according to the embodiment of the present application;
  • Figure 9 is a partial cross-sectional view of the top cover assembly at the liquid injection port of the secondary battery according to the embodiment of the present application.
  • Figure 10 is an exploded schematic diagram of some parts of the top cover assembly at the liquid filling port of the secondary battery according to the embodiment of the present application;
  • Figure 11 is an exploded schematic diagram of some components of the top cover assembly at the liquid injection hole with the positioning hole section in the secondary battery according to the embodiment of the present application;
  • Figure 12 is a partial cross-sectional view of the sealing cover and the positioning hole section assembled in the secondary battery of the embodiment of the present application, and the sealing nail is cylindrical;
  • Figure 13 is a partial cross-sectional view of the sealing cover and the positioning hole section assembled in the secondary battery of the embodiment of the present application, and the sealing nail is spherical;
  • Figure 14 is an exploded schematic diagram of some components of the top cover assembly at the liquid injection hole with a cylindrical positioning hole section in the secondary battery according to the embodiment of the present application;
  • Figure 15 is a partial cross-sectional view of the top cover assembly of the secondary battery in the embodiment of the present application at the liquid injection hole with a cylindrical positioning hole section;
  • Figure 16 is a partial cross-sectional view of some parts of the positioning nail having positioning nail segments in the secondary battery according to the embodiment of the present application;
  • Figure 17 is a schematic cross-sectional view of the positioning pin and the positioning hole section assembled in the secondary battery of the embodiment of the present application, and the positioning hole section has a conical cross-section;
  • Figure 18 is a schematic cross-sectional view of the positioning pin and the positioning hole section assembled in the secondary battery of the embodiment of the present application, and the positioning hole section has a cylindrical cross-section;
  • Figure 19 is a schematic cross-sectional view of the sealing nail section and the positioning hole section of the positioning nail in the secondary battery of the embodiment of the present application, and the sealing nail section is spherical;
  • Figure 20 is a schematic cross-sectional view of the secondary battery in which the positioning pins, sealing cover and positioning hole section are all assembled according to the embodiment of the present application.
  • 1000-energy storage module 100-box, 200-secondary battery, 10-casing, 20-top cover assembly, 1-top cover, 11-explosion-proof installation hole, 12-positive electrode outlet, 13-negative electrode outlet Hole, 14-liquid injection hole, 141-sealing hole section, 142-positioning hole section, 15-accommodation hole, 101-liquid retaining boss, 2-explosion-proof device, 3-positive pole assembly, 31-positive pole , 32-positive electrode fixed structure, 4-negative electrode pole assembly, 41-negative electrode pole, 42-negative electrode fixed structure, 5-sealing structure, 51-sealing nail, 511-sealing nail section, 512-locating nail section, 52- Sealing cover, 521-locating boss.
  • connection should be understood in a broad sense.
  • “connection” may refer to a mechanical structure or a physical structure connection.
  • they can be fixedly connected, detachably connected, or integrated; they can be directly connected or indirectly connected through an intermediate medium.
  • It can also be understood as the physical contact and electrical conduction of components, and it can also be understood as the connection between different components in the circuit structure through physical lines that can transmit electrical signals such as PCB copper foil or wires.
  • Embodiments of the present application include an energy storage module.
  • Figure 1 shows a specific energy storage module according to the embodiment of the present application.
  • the energy storage module 1000 includes a box 100 and a plurality of secondary batteries 200.
  • An installation cavity (not shown in the figure) is formed in the box 100, and the multiple secondary batteries 200 are fixedly installed in the box 100.
  • the secondary battery 200 is also called a rechargeable battery or a storage battery, which refers to a battery that can be charged to activate the active material and continue to be used after the battery is discharged.
  • the plurality of secondary batteries 200 described above can be electrically connected in sequence.
  • the plurality of secondary batteries 200 may be connected in parallel or in series. Alternatively, some of the plurality of secondary batteries 200 are connected in parallel, and the remaining secondary batteries 200 are connected in series.
  • This application does not impose any restrictions on this, and can be reasonably selected according to the actual needs of the energy storage mold.
  • the secondary battery in the embodiment of the present application may be a lead-acid battery, a lithium battery, or a sodium-ion battery. The present application does not limit the type of the secondary battery.
  • Figure 2 shows the three-dimensional structure of a secondary battery in an embodiment of the present application.
  • the secondary battery 200 includes a case 10 , an electrode assembly (not shown in the figure) and a top cover assembly 20 .
  • An accommodating cavity (not shown in the figure) is formed in the casing 10 , and the top of the casing 10 has an opening communicating with the accommodating cavity.
  • the electrode assembly is installed in the accommodation cavity through the opening.
  • the accommodation cavity is also filled with electrolyte.
  • the above-mentioned top cover assembly 20 includes a top cover 1.
  • the top cover 1 can be installed at the opening of the housing 10 and is sealingly connected with the housing 10. Therefore, top The cover 1 can close the accommodation cavity of the housing 10 .
  • the shape of the top cover 1 is the same as the shape of the opening of the housing 10 .
  • the size of the top cover 1 can be the same as or similar to the size of the opening of the housing 10 .
  • the term "similar” means that there will be a certain installation error between the size of the top cover 1 and the size of the opening on the housing 10 .
  • the shape of the housing 10 may be square or cylindrical, which is not limited in this application.
  • the housing shown in FIG. 2 is a rectangular parallelepiped, and the opening at the top of the housing 10 is a rectangle (or a rectangle with rounded corners).
  • the top cover 1 is also rectangular (or rectangular with rounded corners). Therefore, the top cover 1 can be sealingly connected with the top opening of the housing 10 .
  • the above-mentioned casing 10 can be made of metal material, has high structural strength, and can reliably protect the electrolyte and electrode components in the casing 10 .
  • the housing 10 can be made of aluminum, aluminum alloy, steel or other materials.
  • the above-mentioned electrode assembly includes two layers of pole pieces and a separator.
  • One of the two layers of pole pieces is the positive pole piece, and the other layer of the two layers of pole pieces is the negative pole piece.
  • the separator is installed between the two layers of pole pieces and isolates the two layers of pole pieces.
  • the positive electrode sheet, separator and negative electrode sheet may be stacked or rolled together to form an electrode assembly.
  • the top cover 1 can be a thin plate structure made of the same material as the case 10 , so that the entire secondary battery 200 has uniform and reliable structural strength, and has good protection against the internal electrode components and electrolyte. Protective effect.
  • FIG 3 is a perspective view of the top cover assembly according to the embodiment of the present application.
  • Figure 4 is a schematic cross-sectional view of the top cover assembly according to the embodiment of the present application.
  • the top cover 1 is provided with an explosion-proof installation hole 11, a positive electrode lead-out hole 12, a negative electrode lead-out hole 13 and a liquid injection hole 14.
  • the top cover assembly 20 not only includes the above-mentioned top cover 1, but also includes other components.
  • other components include the explosion-proof device 2, the positive pole assembly 3 and the negative pole assembly 4.
  • the explosion-proof device 2 can be installed in the above-mentioned explosion-proof installation hole 11.
  • the explosion-proof device 2 may be an explosion-proof valve.
  • the positive pole assembly 3 can be installed in the positive lead hole 12 .
  • the negative pole assembly 4 can be installed in the negative lead hole 13 .
  • the explosion-proof mounting hole 11 may be located near the center of the top cover 1 .
  • the explosion-proof device 2 can be destroyed, so that the gas in the casing 10 can be discharged to the outside through the through hole formed after the explosion-proof device 2 is destroyed, thereby preventing the secondary battery 200 from occurring. Explosion problem.
  • the above-mentioned positive pole assembly 3 includes a positive pole 31 and a positive fixing structure 32 .
  • the positive pole 31 is installed at the positive lead hole 12 through the positive fixing structure 32 .
  • the negative electrode post assembly 4 includes a negative electrode post 41 and a negative electrode fixing structure 42 .
  • the negative electrode post 41 is installed at the negative electrode lead hole 13 through the negative electrode fixing structure 42 .
  • the positive electrode lead-out hole 12 and the negative electrode lead-out hole 13 may be respectively located at both side edge areas along the length direction of the top cover 1 .
  • the above-mentioned liquid injection hole 14 can be provided between the positive electrode lead hole 12 and the explosion-proof installation hole 11 , or between the negative electrode lead hole 13 and the explosion-proof installation hole 11 .
  • the liquid injection hole 14 matches the electrolyte injection pipe, so that the injection hole and the electrolyte injection pipe can be connected in a sealed manner.
  • the electrolyte can be introduced into the accommodation cavity of the housing 10 through the injection pipe and the injection hole 14 .
  • the above-mentioned top cover assembly 20 also includes a sealing structure 5 as shown in FIG. 5 .
  • the sealing structure 5 includes a sealing nail 51 , and the sealing nail 51 is sealingly connected with the liquid injection hole 14 .
  • the sealing nail 51 in the embodiment of the present application is spherical as shown in Figure 5, or can also be cylindrical as shown in Figure 6. This application does not limit this.
  • the sealing nail 51 can be driven into the liquid injection hole 14 by external force, causing elastic or plastic deformation of the hole wall of the liquid injection hole 14 and sealing connection with the liquid injection hole 14 . Thereby, the liquid injection hole 14 is sealed.
  • a liquid-blocking boss 101 is formed at the liquid injection hole 14 on the upper surface of the top cover 1 .
  • the liquid-blocking boss 101 is arranged around the periphery of the liquid injection hole 14 so that the inner wall of the liquid-blocking boss 101 can enclose a receiving hole 15 that communicates with the liquid injection hole 14 .
  • the diameter D 2 of the accommodation hole 15 is larger than the diameter D 3 of the liquid injection hole 14 .
  • the sealing structure 5 also includes a sealing cover 52 as shown in FIG. 9 , and the sealing cover 52 can be installed in the accommodating hole 15 surrounded by the liquid-blocking boss 101 .
  • the sealing cover 52 can be sealingly connected with the accommodation hole 15 .
  • the sealing cover 52 and the accommodating hole 15 may be connected by welding.
  • the welding method may be laser welding.
  • the connection between the sealing cover 52 and the accommodating hole 15 has high strength and good sealing performance.
  • the above-mentioned sealing nail 51 is sealingly connected with the liquid injection hole 14 and can be regarded as the first sealing structure.
  • the sealing cover 52 is sealed with the accommodation hole 15
  • the connection can be regarded as the second sealing structure. Therefore, the top cover assembly 20 in the embodiment of the present application achieves sealing at the liquid injection hole 14 through two sealing structures. Even if the sealing effect of the sealing nail 51 on the liquid injection hole 14 is reduced after long-term use of the secondary battery, or the sealing nail 51 and the liquid injection hole 14 are misaligned during installation, resulting in poor sealing effect, the second sealing structure can still ensure The sealing performance of the liquid injection hole 14. Therefore, leakage problems can be avoided.
  • the liquid blocking boss 101 can also prevent the electrolyte from overflowing at the liquid injection hole 14. In particular, it avoids the electrolyte from overflowing into the explosion-proof device 2 and causing corrosion to the explosion-proof device 2, and avoids the electrolyte from overflowing into the positive pole 31 (or the negative pole 41), so that the positive pole 31 (or the negative pole 41) It overlaps with the top cover 1, causing the risk of short circuit and other problems. Therefore, the safety performance of the secondary battery 200 is improved.
  • the liquid-blocking boss 101 may be annular.
  • the accommodating hole 15 surrounded by the liquid-blocking boss 101 is a circular hole.
  • the liquid retaining boss 101 may also be in the shape of a square ring.
  • the accommodating hole 15 surrounded by the liquid-blocking boss 101 is a square hole. This application does not limit this.
  • the above-mentioned sealing cover 52 can be made of various materials. Furthermore, the sealing cover 52 may be made of the same material as the top cover 1 , the liquid-blocking boss 101 , and the housing 1 , or may be made of the same material as the top cover 1 and the liquid-blocking boss 101 . The manufacturing materials and the manufacturing materials of the housing 1 are different, and this application does not limit this. As an example, the sealing cover 52 is made of the same material as the top cover 1, the liquid-blocking boss 101, and the housing 1. The sealing cover 52 is made of the same material as the liquid-blocking boss 101 and the top cover. The material of 1 and the material of housing 10 are both aluminum.
  • Aluminum has the advantages of low density, high strength and good plasticity, and can be easily molded into the desired shape of the secondary battery 200 .
  • the sealing cover 52 , the liquid-blocking boss 101 , the top cover 1 , and the housing 10 may all be made of aluminum alloy.
  • Aluminum alloy has the advantages of light weight, softness, high strength and good corrosion resistance.
  • the sealing cover 52 is made of the same material as the top cover 1 , which facilitates the connection between the sealing cover 52 and the top cover 1 by welding.
  • the sealing cover 52 when designing the size of the sealing cover 52 , the sealing cover 52 needs to be easily and quickly installed in the accommodating hole 15 , and the welding operation between the sealing cover 52 and the hole wall of the accommodating hole 15 of the top cover 1 needs to be facilitated.
  • the outer diameter D 1 of the sealing cover 52 and the accommodating hole 15 The diameter D 2 satisfies: 0.9D 2 ⁇ D 1 ⁇ D 2 , so that the assembly operation of the sealing cover 52 and the accommodating hole 15 is more convenient.
  • the liquid injection hole 14 in the embodiment of the present application includes sealing hole segments 141 and positioning holes connected in sequence from bottom to top. Hole section 142.
  • the diameter D 4 of the positioning hole section 142 is larger than the diameter D 5 of the sealing hole section 141 .
  • a positioning boss 521 is provided on the lower surface of the sealing cover 52 at a position corresponding to the positioning hole section 142 . As shown in FIGS. 12 and 13 , the positioning boss 521 can abut against the hole wall of the positioning hole section 142 .
  • the positioning boss 521 can limit the continued downward movement of the sealing cover 52 and the movement of the sealing cover 52 toward the outside of the positioning hole section 142 . Therefore, the installation and positioning of the sealing cover 52 on the top cover 1 and the height positioning in the positioning hole section 142 are achieved, and the problem of excessive one-side deviation of the sealing cover 52 in the accommodating hole 15 is avoided.
  • the sealing cover 52 when the sealing cover 52 is welded to the wall of the accommodating hole 15 of the top cover 1 , the welding thermal stress generated by the welding operation will drive the sealing cover 52 to move. Due to the existence of the positioning boss 521, the positioning boss 521 of the sealing cover 52 can squeeze the positioning hole section 142 of the liquid injection hole 14. Therefore, the welding thermal stress generated during the welding process of the sealing cover 52 can be transferred to the extrusion force between the positioning boss 521 and the sealing cover 52 , which can effectively improve the welding yield. In addition, the above-mentioned positioning boss 521 can be formed on the sealing cover 52 through a stamping process.
  • the hole wall of the above-mentioned positioning hole section 142 is a slope.
  • the diameter of the positioning hole section 142 decreases from top to bottom. Therefore, the longitudinal section of the positioning hole section 142 is an inverted trapezoid.
  • the longitudinal section is perpendicular to the plane of the top plate. Or, in other words, the positioning hole section 142 is a rounded cone-shaped hole.
  • the positioning hole section 142 is also more convenient to process.
  • the outer wall of the positioning boss 521 of the sealing cover 52 is also a slope. That is, the positioning boss 521 is a rounded cone-shaped boss. Moreover, the diameter of each area on the outer wall of the positioning boss 521 decreases sequentially from top to bottom. Therefore, it is ensured that the positioning boss 521 of the sealing cover 52 can abut and cooperate with the positioning hole section 142 to achieve reliable positioning.
  • the inclination angle ⁇ of the hole wall of the positioning hole section 142 and the inclination angle ⁇ of the outer wall of the positioning boss 521 satisfy: ⁇ > ⁇ , and ⁇ - ⁇ 5°.
  • the above-mentioned positioning hole segments 142 may be positioning holes with equal diameters from top to bottom.
  • the positioning hole section 142 is more convenient to process.
  • the positioning boss 521 of the sealing cover 52 is a cylindrical boss to ensure that the positioning boss 521 can be connected with the positioning hole section 142 to achieve positioning.
  • the above is the application of the positioning hole section 142 as the positioning structure of the sealing cover 52 .
  • the above-mentioned positioning hole segment 142 can also serve as a positioning structure for the sealing nail 51 .
  • the sealing nail 51 includes a sealing nail section 511 and a positioning nail section 512 .
  • the sealing nail section 511 can sealingly cooperate with the sealing hole section 141 of the liquid injection hole 14 .
  • the positioning nail section 512 can abut against the positioning hole section 142 , and the diameter D 6 of the positioning nail section 512 is larger than the diameter D 7 of the sealing nail section 511 . Therefore, the height positioning of the sealing nail 51 can be completed by the positioning nail section 512 abutting against the positioning hole section 142 . Therefore, the risk of short circuit caused by the sealing nail 51 being smashed into the housing 10 by external force is avoided.
  • the positioning hole section 142 as the positioning structure of the sealing nail 51 can also be a rounded cone-shaped hole as shown in Figure 17, or a cylindrical hole as shown in Figure 18, which is not covered in this application. limit.
  • the positioning nail section 512 in the sealing nail 51 is a rounded cone shape that matches the positioning hole section 142 .
  • the positioning nail section 512 of the sealing nail 51 is a cylindrical hole that matches the positioning hole section 142 .
  • the sealing nail section 511 of the sealing nail 51 may be cylindrical as shown in FIG. 18 or spherical as shown in FIG. 19 , which is not limited in this application.
  • the above-mentioned sealing nail 51 can be made of plastic or steel, which is not limited in this application.
  • the above-mentioned positioning hole section 142 can also be used as a positioning structure for the sealing cover 52 and the sealing nail 51 . Therefore, the sealing cover 52 and the sealing nail 51 can be positioned simultaneously through one positioning hole section 142, and the structure of the top cover assembly 20 is simple.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Filling, Topping-Up Batteries (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

Des modes de réalisation de la présente demande se rapportent au domaine technique du stockage d'énergie, divulguent un ensemble couvercle supérieur d'une batterie, une batterie secondaire et un module de stockage d'énergie et résolvent le problème selon lequel un risque de fuite d'électrolyte est susceptible de se produire en raison du fait qu'un effet d'étanchéité d'une colonne d'acier d'étanchéité sur un trou d'injection d'électrolyte d'un couvercle supérieur est réduit après qu'une batterie est utilisée pendant une longue période. L'ensemble couvercle supérieur de la batterie dans les modes de réalisation de la présente demande comprend un couvercle supérieur, une broche d'étanchéité et un couvercle d'étanchéité. Un trou d'injection d'électrolyte est formé sur le couvercle supérieur. La broche d'étanchéité est utilisée pour être reliée de manière étanche au trou d'injection d'électrolyte. Un bossage de blocage d'électrolyte est formé au niveau du trou d'injection d'électrolyte sur la surface supérieure du couvercle supérieur dans la direction circonférentielle du trou d'injection d'électrolyte. Un trou de réception est défini par la paroi interne du bossage de blocage d'électrolyte et le trou de réception peut être en communication avec le trou d'injection d'électrolyte. Le couvercle d'étanchéité peut être reçu dans le trou de réception et est relié de manière étanche au trou de réception. La broche d'étanchéité dans l'ensemble couvercle supérieur est reliée de manière étanche au trou d'injection d'électrolyte et le couvercle d'étanchéité est relié de manière étanche au trou de réception, de sorte que deux structures d'étanchéité au niveau du trou d'injection d'électrolyte sont formées. Les performances d'étanchéité au niveau du trou d'injection d'électrolyte sont fiables, de sorte que le problème de fuite d'électrolyte au niveau du trou d'injection d'électrolyte peut être évité.
PCT/CN2023/104115 2022-08-12 2023-06-29 Ensemble couvercle supérieur de batterie, batterie secondaire et module de stockage d'énergie WO2024032225A1 (fr)

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CN202210966029.X 2022-08-12
CN202210966029.XA CN117638433A (zh) 2022-08-12 2022-08-12 一种电池的顶盖组件、二次电池及储能模组

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WO2024032225A1 true WO2024032225A1 (fr) 2024-02-15

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013062199A (ja) * 2011-09-14 2013-04-04 Toshiba Corp 密閉形電池
CN204809306U (zh) * 2015-07-15 2015-11-25 宁德时代新能源科技有限公司 二次电池的注液孔焊接组件
CN209169284U (zh) * 2018-11-16 2019-07-26 东莞市沃泰通新能源有限公司 一种锂离子电池注液孔密封组件
CN211980653U (zh) * 2020-03-23 2020-11-20 比亚迪股份有限公司 盖板、动力电池和汽车
CN212161870U (zh) * 2020-05-14 2020-12-15 宁德时代新能源科技股份有限公司 端盖组件、外壳组件、二次电池、电池组、使用电池的装置及注液装置
CN212392309U (zh) * 2020-07-21 2021-01-22 宁德时代新能源科技股份有限公司 端盖组件、电池单体、电池以及用电装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013062199A (ja) * 2011-09-14 2013-04-04 Toshiba Corp 密閉形電池
CN204809306U (zh) * 2015-07-15 2015-11-25 宁德时代新能源科技有限公司 二次电池的注液孔焊接组件
CN209169284U (zh) * 2018-11-16 2019-07-26 东莞市沃泰通新能源有限公司 一种锂离子电池注液孔密封组件
CN211980653U (zh) * 2020-03-23 2020-11-20 比亚迪股份有限公司 盖板、动力电池和汽车
CN212161870U (zh) * 2020-05-14 2020-12-15 宁德时代新能源科技股份有限公司 端盖组件、外壳组件、二次电池、电池组、使用电池的装置及注液装置
CN212392309U (zh) * 2020-07-21 2021-01-22 宁德时代新能源科技股份有限公司 端盖组件、电池单体、电池以及用电装置

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