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EP-4075555-B1 - ELECTRODE ASSEMBLY AND ITS BATTERY DEVICE THEREOF

EP4075555B1EP 4075555 B1EP4075555 B1EP 4075555B1EP-4075555-B1

Inventors

  • YANG, SZU-NAN
  • WU, MENG-HUNG
  • FEI, Wen-xin
  • CHAO, HSING-CHIH

Dates

Publication Date
20260506
Application Date
20220310

Claims (16)

  1. An electrode assembly (30), comprising: a first belt current collector (32) and a second belt current collector (33) opposed to the first belt current collector (32); a plurality of electrochemical systems (301), disposed between the first belt current collector (32) and the second belt current collector (33); a glue frame (36), adhering and being sandwiched between the first belt current collector (32) and the second belt current collector (33) and surrounding the electrochemical systems (301), wherein the electrochemical systems (301) are completely sealed by the glue frame (36), the first belt current collector (32) and the second belt current collector (33) to make charge transfer occurring between adjacent two of the electrochemical systems (301) without electrochemical reaction; and a plurality of bending portions (38), formed by bending portions of the glue frame (36), which are located between the electrochemical systems (301), together with the first belt current collector (32) and the second belt current collector (33) adhered by these portions of the glue frame (36) to make the electrochemical systems (301) be stacked in a back to front orientation.
  2. The electrode assembly (30) of claim 1, wherein the electrochemical systems (301) are vertically stacked in a zigzag shape along with a signal axis to form a parallel connection.
  3. The electrode assembly (30) of claim 1, further comprising a heat dissipating current collector (41, 42), including a plate body (411, 421) and a plurality of extension plates (412, 422) extended from an edge of the plate body (411, 421), wherein the extension plates (412, 422) are disposed between the stacked electrochemical systems (301) and contact with the first belt current collector (32) or the second belt current collector (33).
  4. The electrode assembly (30) of claim 1, wherein each of the electrochemical systems (301) comprising: a first active material layer (34), being in contact with the first belt current collector (32); a second active material layer (35), being in contact with the second belt current collector (33); and a separator (31), disposed between the first active material layer (34) and the second active material layer (35).
  5. The electrode assembly (30) of claim 4, further comprising an electrolyte system impregnated in the first active material layer (34) and the second active material layer (35), wherein the electrolyte system is a gel electrolyte, a liquid electrolyte, a solid electrolyte or a combinations thereof.
  6. The electrode assembly (30) of claim 5, wherein the glue frame (36) seals all of the electrochemical systems (301), and the electrolyte system only circulates within each of the electrochemical systems (301).
  7. The electrode assembly (30) of claim 1, wherein the glue frame (36) comprising a silicone layer (364) and two modified silicone layers (362, 363) disposed on two sides of the silicone layer (364), wherein one of the two modified silicone layers (362, 363) is adhered to the first belt current collector (32) and the other of the two modified silicone layers (362, 363) is adhered to the second belt current collector (33).
  8. The electrode assembly (30) of claim 1, wherein at least one of the first belt current collector (32) and the second belt current collector (33) includes a structural reinforcing layer (321, 331) on an outer surface to improve a mechanical strength thereon.
  9. The electrode assembly (30) of claim 8, wherein the structural reinforcing layer (321, 331) is made of a material including polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), polyimide, nylon, polyurethane, acrylic epoxy, silicone or a combinations thereof.
  10. The electrode assembly (30) of claim 1, wherein each of the first belt current collector (32) and the second belt current collector (33) includes a lead (52, 53), and wherein the two leads (52, 53) are located at different sides.
  11. The electrode assembly (30) of claim 1, wherein each of the first belt current collector (32)and the second belt current collector (33) includes a lead (52, 53), and wherein the two leads (52, 53) are located at the same side.
  12. The electrode assembly (30) of claim 1, wherein a number of the electrochemical systems (301) is odd.
  13. The electrode assembly (30) of claim 1, wherein a number of the electrochemical systems (301) is even.
  14. A battery device composed of the electrode assembly (30) of claim 1 and a housing (51; 61) packaging the electrode assembly (30).
  15. The battery device of claim 14, wherein a fire retardant or a coolant is filled between the electrode assembly (30) and the housing (51; 61).
  16. The battery device of claim 14, wherein the housing (51; 61) is an aluminum plastic film (51) or includes an upper case (611) and a lower case (612).

Description

BACKGROUND OF THE INVENTION CROSS REFERENCES TO RELATED APPLICATIONS The present application claims priority to Taiwanese Patent Application 110109696 filed in the Taiwanese Patent Office on Mar. 18, 2021 and Taiwanese Patent Application 111100917 filed in the Taiwanese Patent Office on Jan. 10, 2022. Field of Invention The present invention relates to an electrode assembly, in particular to an electrode assembly and its battery device thereof, which the electrochemical systems are folded to be stacked along with a z-axis. Related Art In recent years, with the rapid development of various portable electronic products, electric vehicles, power storage stations, there is a high demand for energy storage devices with both high energy storage density and environmental protection. The ion secondary batteries are the optimal solution. Further, various secondary batteries such as lithium ion secondary batteries, magnesium ion secondary batteries, and sodium ion secondary batteries have been developed. Therefore, how to improve the energy density as much as possible in a limited space has always been the focus of the development of the entire related industry. For example, please refer to FIG. 1A, as disclosed in US20140227583A1, both sides of a single current collector 11 are respectively and repeatedly coated with a cathode active material and an anode active material to form the anode patterns 12 and the cathode patterns 13. Then, non-coating portions of the current collector 11, on which the anode patterns 12 and the cathode patterns 13 are not formed, are bent into a vertical-sectional zigzag shape. The separators 14 are disposed at the interfaces of the facing anode patterns 12 and cathode patterns 13 to form the zigzag-shaped battery cell. Also, please refer to another application, US2020335813A1, of the same applicant, a positive electrode having a plurality of positive patterns formed by being pattern-coated with a positive active material at a predetermined interval and positive uncoated regions where the positive active material is not coated, and a negative electrode having a plurality of negative patterns formed by being pattern-coated with a negative active material at a predetermined interval and negative uncoated regions where the negative active material is not coated are provided. Then, a separator disposed between the positive electrode and the negative electrode. The electrode assembly is formed in a zigzag-shape by bending the positive uncoated region and the negative uncoated region. Moreover, please refer to FIG. 1B, as disclosed in TW200631218A, the flexible separator 15 is used to be bent. The anode electrode 16 and the cathode electrode 17 are only attached on the separator 15. The anode electrode 16 and the cathode electrode 17 are electrically insulated by the separator 15 to perform the vertical stacking. However, in above-mentioned applications, the positive active material and the negative active material are bent directly through the separator to form a vertical stacking. Without any buffering mechanism, due to the bending forces it is easy to cause the active materials to be broken. Further, the electrolytes are shared, it will face the problems of the limitation of the maximum permissible voltage and the non-uniform electric field distribution. Therefore, this invention provides an electrode assembly and its battery device thereof to mitigate or obviate the aforementioned problems. SUMMARY OF THE INVENTION It is a primary objective of this invention to provide an electrode assembly and its battery device thereof. The electrochemical systems of the electrode assembly are folded to be vertically stacked in a zigzag shape. The bending position includes only the belt current collector and the glue frame to prevent the active materials to be broken. It is another objective of this invention to provide an electrode assembly and its battery device thereof. The electrochemical systems of the electrode assembly are folded to be vertically stacked in a zigzag shape and for the electrical connections. Therefore, the amount of the tabs configured to be connected in series or parallel is reduced. The production efficiency and the arrangement for power requirements are improved, and the difficulty in manufacturing processes and the energy density loss caused by space configuration are reduced. It is also another objective of this invention to provide an electrode assembly and its battery device thereof. The electrode assembly is formed by the electrochemical systems and the glue frame to be directly sandwiched between two belt current collectors. Therefore, it is easy to mass produce and to be productized for mass production. In order to implement the abovementioned, this invention discloses an electrode assembly, which includes a first belt current collector, a second belt current collector, a glue frame, a plurality of electrochemical systems and a plurality of bending portions. The electroche