WO2024031988A1 - Batterie cylindrique - Google Patents

Batterie cylindrique Download PDF

Info

Publication number
WO2024031988A1
WO2024031988A1 PCT/CN2023/081850 CN2023081850W WO2024031988A1 WO 2024031988 A1 WO2024031988 A1 WO 2024031988A1 CN 2023081850 W CN2023081850 W CN 2023081850W WO 2024031988 A1 WO2024031988 A1 WO 2024031988A1
Authority
WO
WIPO (PCT)
Prior art keywords
manifold
cover plate
flange
current
boss
Prior art date
Application number
PCT/CN2023/081850
Other languages
English (en)
Chinese (zh)
Inventor
冯树南
王举
郭春泰
何伟
杨益志
Original Assignee
蓝京新能源(嘉兴)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 蓝京新能源(嘉兴)有限公司 filed Critical 蓝京新能源(嘉兴)有限公司
Publication of WO2024031988A1 publication Critical patent/WO2024031988A1/fr

Links

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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
    • 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 invention belongs to the technical field of cylindrical batteries, and in particular relates to a cylindrical battery.
  • the traditional cylindrical battery cover has a complex structure; the cap serves as the positive electrode and the casing serves as the negative electrode.
  • the positive and negative electrodes are conductively connected from both ends of the cylindrical battery, which is inconvenient for the design and welding of the external module bus; in addition, due to the Lack of ears affects the power performance of the battery.
  • the roll groove method is used for sealing, and the roll groove position requires at least 2 to 3 mm of space, which reduces the space utilization and energy density of the battery core;
  • the connection between the manifold plate and the casing, the edge flanging of the manifold plate is in contact with the casing and connected through laser welding.
  • the cover plate After welding, the cover plate is welded to the circumference of the casing. It is a two-pass welding. The equipment investment cost is high, the production process is many, and the efficiency is low; Another form of connection between the manifold plate and the cover plate is to connect the manifold plate to the manifold plate through laser penetration welding of the cover plate. The welding stability is poor and the welding quality cannot be detected.
  • the present invention aims to propose a cylindrical battery.
  • the cylindrical lithium ion improves the electrical and thermal conductivity through a simple bus plate design and cover plate design, which is beneficial to improving the fast charging capability of the battery and at the same time improving the Manufacturing efficiency.
  • a cylindrical battery includes a shell assembly and a No. 1 manifold, a winding core, a No. 2 manifold and a cover plate arranged sequentially from bottom to top inside the case assembly.
  • the No. 2 manifold is a disk structure and the No. 2 manifold is A circle of No. 2 flange is formed on the circumferential edge, and the bending angle of the No. 2 flange is A, A ⁇ 90°.
  • the raised direction of the platform is the same as that of No. 2 flange.
  • the No. 2 manifold is welded to the core and the cover plate, and the two sides of the No. 1 manifold are welded to the bottom of the core and the bottom of the shell assembly respectively.
  • the housing assembly includes a housing, an insulating sheet, a sealing ring and a pole.
  • the bottom of the housing is provided with a mounting hole.
  • the mounting hole is riveted to the pole through a sealing nail, and the housing and the pole are sealed by a sealing ring.
  • an insulating sheet is installed at the bottom of the casing, and the insulating sheet is used for insulation between the core and the casing.
  • the cover plate is an uneven disc, with a circle of steps formed at the circumferential edge of the cover plate, an explosion-proof score is provided on the cover plate, and a cross step is provided in the center.
  • the center of the pole has a through-hole structure, and a number of steps are formed inside the through-hole structure. From top to bottom, there are step No. 1, step No. 2 and step No. 3 respectively.
  • the No. 1 manifold has a disk structure, and a No. 1 flange is formed at the circumferential edge of the No. 1 manifold.
  • a conical boss is formed in the center of the No. 1 manifold, and a liquid injection hole is arranged in the middle of the conical boss. hole.
  • the cylindrical battery of the present invention has the following advantages:
  • the cylindrical battery of the present invention improves the electrical and thermal conductivity through a simple manifold and cover plate design, which is beneficial to improving the fast charging capability of the battery, while improving manufacturing efficiency and reducing costs.
  • the cover plate cooperates with the manifold plate and the casing, and the cover plate, the manifold plate and the casing are welded together through laser peripheral welding to achieve sealing and conductive connection functions while reducing the number of One-time welding reduces costs and improves efficiency.
  • Figure 1 is a schematic diagram of a cylindrical battery according to an embodiment of the present invention.
  • Figure 2 is a schematic diagram of a housing assembly according to an embodiment of the present invention.
  • Figure 3 is an enlarged view of the ellipse in Figure 2;
  • Figure 4 is a schematic diagram of an insulating sheet according to an embodiment of the present invention.
  • Figure 5 is a schematic diagram of a pole according to an embodiment of the present invention.
  • Figure 6 is a cross-sectional view of the No. 1 manifold according to the embodiment of the present invention.
  • Figure 7 is a schematic diagram of the No. 2 manifold according to the embodiment of the present invention.
  • Figure 8 is a cross-sectional view along line A-A in Figure 7;
  • Figure 9 is a schematic diagram of a cover plate according to an embodiment of the present invention.
  • connection should be understood in a broad sense.
  • connection or 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 an internal connection between two components.
  • a cylindrical battery as shown in Figures 1 to 9, includes a housing assembly 2 and a No. 1 manifold 3, a winding core 1, a No. 2 manifold 4 and a cover plate 5 arranged sequentially inside from bottom to top.
  • the No. 2 manifold 4 is a disk structure.
  • a circle of the No. 2 flange 41 is formed at the circumferential edge of the No. 2 manifold 4, and the bending angle of the No. 2 flange 41 is A, A ⁇ 90°, and the No. 2 manifold
  • a number of notches 43 are evenly distributed in the circumference of the plate 4, and a boss 42 is provided at the center.
  • the boss 42 has a raised direction opposite to the direction of the No. 2 flange 41.
  • the No. 2 manifold plate 4 is integrated with the shell and the cover plate 5. Welding, the two sides of the No. 1 manifold 3 are welded to the bottom of the winding core 1 and the bottom of the shell assembly 2 respectively.
  • the No. 2 manifold plate 4 is welded with the cover plate and the shell at one time by laser welding; the normal situation is that the No. 2 flange of the No. 2 manifold plate is laser welded to the inner wall of the shell first, and after the cover plate is closed, the cover plate and The shell opening is welded. This design saves one welding session.
  • the winding core 1 is one of a full-lug winding core, a cut-and-stacked tab winding core, or a multi-pole tab winding core.
  • the housing assembly 2 includes a housing 21, an insulating sheet 22, a sealing ring 23 and a pole 24.
  • the bottom of the housing 21 is provided with a mounting hole.
  • the mounting hole is riveted to the pole 24 through a sealing nail.
  • the insulating sheet 22 is used for insulation between the winding core 1 and the housing 21.
  • the shell is riveted with perforated poles and welded and sealed around the cover, saving space.
  • the polarity is directed to the same side, which facilitates module or system design and bus welding.
  • Shell 1 is a hollow U-shaped metal shell.
  • the sealing ring 23 can be integrally injection molded onto the housing 21 , or can be divided into two sealing rings 22 and assembled after separate injection molding.
  • the center of the pole 24 has a through-hole structure, and several steps are formed inside the through-hole structure. From top to bottom, they are the first step 241, the second step 242 and the third step 243.
  • the first step 241 is used for the first manifold. 3 is welded to the pole 24.
  • the second step 242 is used to isolate the contamination of the electrolyte during liquid injection or precharging so that it will not affect the welding position of the sealing nail.
  • the third step 243 is the flat surface after the pole 24 is riveted and is used for sealing. Sealing welding of nails and poles.
  • the pole 24 has a central structure with multiple steps. In addition to being used for manifold welding, cap welding and as a liquid injection hole, it also prevents the electrolyte from contaminating the cap welding position during liquid injection or precharging, reducing the production process. Bad, no need to add cleaning process.
  • the No. 1 manifold 3 has a disk structure.
  • the No. 1 flange 31 is formed at the circumferential edge of the No. 1 manifold 3 and a conical boss 32 is formed in the middle.
  • a liquid injection hole 33 is provided in the middle of the conical boss 32 .
  • the conical boss hole structure in the center of No. 1 bus plate 3 is convenient for installation in alignment with the pole hole.
  • the tapered shape prevents welding dust from entering the inside of the roll core.
  • the two sides of the No. 1 manifold 3 are welded to the winding core 1 and the pole 24 respectively.
  • the No. 1 flange 3 mainly strengthens the No. 1 manifold 3 and plays a supporting role in the shell core 1 to prevent the roll core 1 from tilting.
  • the tapered boss 32 facilitates the positioning and installation of the through-hole structure of the No. 1 busbar 3 and the pole 24, and at the same time prevents dust from falling into the inside of the core 1 when the No. 1 busbar 3 and the pole 24 are welded; it also has an integrated liquid injection hole 33 Function:
  • the injection hole 33 serves as the injection hole for the electrolyte.
  • the No. 2 manifold 4 is a disk structure.
  • a circle of the No. 2 flange 41 is formed at the circumferential edge of the No. 2 manifold 4, and the bending angle of the No. 2 flange 41 is A, A ⁇ 90°, and the No. 2 manifold Disk 4 circumferential internal average
  • the boss 42 has a protruding direction opposite to the direction of the No. 2 flange 41.
  • the design method of the No. 2 busbar 4 is to be welded together with the cover plate, the No. 2 busbar 4 and the shell, saving one welding and reducing manufacturing costs; the design of the punched petals and flanges of the busbar can absorb electricity Core height deviation.
  • the boss 42 is inserted into the center hole of the core 1 to facilitate the positioning of the No. 2 manifold 4.
  • the bending angle of the No. 2 flange 41 is ⁇ 90°. , so that after entering the shell, the No. 2 flange 41 is in close contact with the inner wall of the shell to facilitate subsequent welding;
  • the notch 43 is a die-cut notch petal, and the notch groove of the notch 43 can, on the one hand, circulate the electrolyte and quickly absorb it.
  • the petals of the notch 43 facilitate the folding of the second flange 41 to be higher than the petal welding plane of the second manifold 4, which can be used to absorb the height deviation of the winding core 1.
  • the second bus plate 4 has die-cut petal scores and an elastic bending structure, which can be used to absorb electrolyte and assembly tolerances.
  • the cover plate 5 is an uneven disk, and a circle of steps 51 is formed at the circumferential edge of the cover plate 5.
  • the cover plate 5 is provided with explosion-proof notches 52, and a cross step 53 is provided in the center.
  • the cover plate 5 has a structure and a reinforced structure for positioning with the housing 21 and the No. 1 manifold 3, and also integrates an explosion-proof function.
  • the step 51 is formed by stamping and is used for assembly and welding with the housing 21 and the second manifold 4.
  • An incomplete circle of explosion-proof notches 52 is formed on the cover plate 5 by stamping for explosion-proof and exhaust at the bottom;
  • the cross step 53 can compress the core 1 to prevent movement during use, resulting in poor connection or other problems.
  • the pole tab under the winding core 1 is laser welded to the No. 1 manifold 3. After welding, an integrated structure is formed and inserted into the housing 21. Then the center boss of the No. 1 manifold 3 is welded to the No. 1 step 241;

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)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne une batterie cylindrique, comprenant un ensemble boîtier (2) et un disque de collecte de courant n° 1 (3), un noyau d'enroulement (1), un disque de collecte de courant n° 2 (4) et une plaque de recouvrement (5), qui sont agencés séquentiellement à l'intérieur de l'ensemble boîtier de bas en haut, le disque de collecte de courant n° 2 (4) ayant une structure de disque ; une bride annulaire n° 2 (41) est formée au niveau d'un bord circonférentiel du disque de collecte de courant n° 2 (4) ; un angle de courbure de la bride n° 2 (41) est A, A ≤ 90° ; plusieurs entailles (43) sont réparties uniformément à l'intérieur du disque de collecte de courant n° 2 (4) dans une direction circonférentielle ; un bossage (42) est agencé au centre du disque de collecte de courant n° 2 ; la direction de saillie du bossage (42) est opposée à la direction de la bride n° 2 (41) ; le disque de collecte de courant n° 2 (4) est soudé d'un seul tenant à un boîtier (21) et à la plaque de recouvrement (5) ; et deux côtés du disque de collecte de courant n° 1 (3) sont respectivement soudés au fond du noyau d'enroulement (1) et au fond de l'ensemble boîtier (2). Au moyen de conceptions simples des disques de collecte de courant et de la plaque de recouvrement, une amélioration de la conductivité électrique et thermique, de la rapidité de capacité de charge et de l'efficacité de fabrication de la batterie est facilitée et le coût est également réduit.
PCT/CN2023/081850 2022-08-08 2023-03-16 Batterie cylindrique WO2024031988A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210945418.4 2022-08-08
CN202210945418.4A CN115395145A (zh) 2022-08-08 2022-08-08 一种圆柱型电池

Publications (1)

Publication Number Publication Date
WO2024031988A1 true WO2024031988A1 (fr) 2024-02-15

Family

ID=84118751

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2023/081850 WO2024031988A1 (fr) 2022-08-08 2023-03-16 Batterie cylindrique

Country Status (2)

Country Link
CN (1) CN115395145A (fr)
WO (1) WO2024031988A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115395145A (zh) * 2022-08-08 2022-11-25 蓝京新能源(嘉兴)有限公司 一种圆柱型电池

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11154496A (ja) * 1997-11-19 1999-06-08 Toa Corp 電池蓋構造
CN114447407A (zh) * 2022-01-28 2022-05-06 蓝京新能源(嘉兴)有限公司 一种圆柱电池及其制作方法
CN114628866A (zh) * 2022-03-28 2022-06-14 蓝京新能源(嘉兴)有限公司 一种高能量密度圆柱型电池及其组装工艺
CN114628794A (zh) * 2022-03-28 2022-06-14 蓝京新能源(嘉兴)有限公司 一种圆柱电池及其制作工艺
CN115395145A (zh) * 2022-08-08 2022-11-25 蓝京新能源(嘉兴)有限公司 一种圆柱型电池

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11154496A (ja) * 1997-11-19 1999-06-08 Toa Corp 電池蓋構造
CN114447407A (zh) * 2022-01-28 2022-05-06 蓝京新能源(嘉兴)有限公司 一种圆柱电池及其制作方法
CN114628866A (zh) * 2022-03-28 2022-06-14 蓝京新能源(嘉兴)有限公司 一种高能量密度圆柱型电池及其组装工艺
CN114628794A (zh) * 2022-03-28 2022-06-14 蓝京新能源(嘉兴)有限公司 一种圆柱电池及其制作工艺
CN115395145A (zh) * 2022-08-08 2022-11-25 蓝京新能源(嘉兴)有限公司 一种圆柱型电池

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