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EP-4207451-B1 - CYLINDRICAL BATTERY MODULE

EP4207451B1EP 4207451 B1EP4207451 B1EP 4207451B1EP-4207451-B1

Inventors

  • LIU, JUNPENG
  • XU, Bohao
  • JIANG, Jibing

Dates

Publication Date
20260506
Application Date
20210203

Claims (12)

  1. A cylindrical battery module, comprising: at least three rows of cell assemblies (100), the cell assemblies (100) in each row comprising a plurality of cylindrical cells (101) arranged along a first direction; two brackets (3) disposed at two sides of the at least two rows of cell assemblies (100) along a second direction, wherein each of the brackets (3) is provided with a plurality of fixing holes (31), and each of the cylindrical cells (101) is plugged into two corresponding ones of the fixing holes (31) on the two brackets (3); a cooling plate (2) clamped between adjacent rows of the cell assemblies (100), wherein the cooling plate (2) is provided with a plurality of arc grooves (21) arranged at intervals and along the first direction, a first inserting portion (22) is formed between two adjacent ones of the arc grooves (21), the plurality of arc grooves (21) are respectively mated with the plurality of cylindrical cells (101) of the cell assemblies (100) in one row, and the first inserting portion (22) is inserted into a gap between two adjacent ones of the cylindrical cells (101) of the cell assemblies (100) in the one row, the cylindrical battery module being characterized in that it further comprises a packing structure comprising keels (1), wherein two adjacent ones of the cylindrical cells (101) of the cell assemblies (100) in at least one row are provided with one of the keels (1) therebetween, and a first structural adhesive layer is provided between the keels (1) and the cylindrical cells (101); and cover plates (4) disposed on end portions of the at least two rows of cell assemblies (100) along a third direction, wherein the cooling plate (2) is annular and comprises a first cooling plate and a second cooling plate, an inlet end (271) and an outlet end (272) of the cooling plate (2) are disposed adjacent to each other and are disposed in a middle portion of the cooling plate (2); the cell assemblies (100) in a first row are disposed between a corresponding one of the cover plates (4) and the first cooling plate, a contact area between the first cooling plate and the cell assemblies (100) in the first row is a first contact area, the cell assemblies (100) in a second row are disposed between the first cooling plate and the second cooling plate, a contact area between the first cooling plate and the cell assemblies (100) in the second row is a second contact area, and the first contact area is greater than the second contact area.
  2. The cylindrical battery module of claim 1, characterized in that the keels (1) are hollow structures.
  3. The cylindrical battery module of claim 1 or claim 2, characterized in that the keels (1) and the brackets (3) are detachably connected or bonded.
  4. The cylindrical battery module of any one of claims 1-3 , characterized in that the cover plates (4) are flat plates.
  5. The cylindrical battery module of any one of claims 1-4 , characterized in that the at least three rows of cell assemblies (100) comprise cell assemblies (100) arranged in first rows adjacent to the cover plates (4), the cover plates (4) are provided with a plurality of recesses (41), a second inserting portion (42) is formed between two adjacent ones of the recesses (41), the plurality of recesses (41) are mated with the plurality of cylindrical cells (101), and the second inserting portion (42) is inserted into the gap between two adjacent ones of the cylindrical cells (101).
  6. The cylindrical battery module of any one of claims 1-5, wherein heat insulation members are provided on the arc grooves (21) of the first cooling plate adjacent to the cell assemblies (100) in the second row.
  7. The cylindrical battery module of any one of claims 1-6, characterized in that the cylindrical cells (101) and the fixing holes (31) are bonded or detachably connected; and sides of the fixing holes (31) adjacent to the cylindrical cells (101) are provided with gluey grooves (311), a second structural adhesive layer (312) is disposed on the gluey grooves (311), and the cylindrical cells (101) are connected to the fixing holes (31) through the second structural adhesive layer (312).
  8. The cylindrical battery module of any one of claims 1-7, characterized by further comprising busbars (6) disposed on the two sides of the at least two rows of cell assemblies (100) along the second direction, wherein the busbars (6) are welded to poles of the cylindrical cells (101), the brackets (3) are provided with slots, and the busbars (6) are disposed on the slots.
  9. The cylindrical battery module of claim 8, characterized by further comprising two flexible circuit (FPC) boards (7), each of the FPC boards (7) is disposed between a corresponding one of the busbars (6) and a corresponding one of the brackets (3), each of the FPC boards (7) is welded to the corresponding one of the busbars (6) and fixed with the corresponding one of the brackets (3).
  10. The cylindrical battery module of any one of claims 1-9, characterized in that the brackets (3) are provided with connecting pieces (32) configured to connect external boxes; the cylindrical battery module further comprises two insulation sheets (5), wherein the two insulation sheets (5) are respectively connected to the two brackets (3) located at two sides of the two insulation sheets (5); and the cylindrical battery module further comprises a metal reinforcing sheet (9) and a compressed foam disposed at both sides of each of the insulation sheets (5), wherein the compressed foam is disposed between a corresponding one of the brackets (3) and a corresponding one of the insulation sheets (5).
  11. The cylindrical battery module of any one of claims 1-10, characterized in that surfaces of the cooling plate (2) are provided with insulating paint layers; and a third structural adhesive layer is provided on the insulating paint layers.
  12. The cylindrical battery module of any one of claims 1-11, characterized in that the plurality of arc grooves (21) are alternately defined on both sides of the cooling plate (2), and the plurality of arc grooves (21) on the both sides of the cooling plate (2) are matched, respectively, with the plurality of cylindrical cells (101) of the cell assemblies (100) in two adjacent rows.

Description

TECHNICAL FIELD The present disclosure relates to the technical field of battery technologies, for example, to a cylindrical battery module. BACKGROUND In related technologies, a cylindrical battery module consists of a plurality of cylindrical cells in a connection of multi-parallels or multi-series. The cylindrical battery module includes a skeleton, the skeleton is opened with through holes, and the cylindrical cells are installed on the through holes, thus a volume is relatively large, which is not conducive to a spatial arrangement of a battery system and affects an energy density of the battery system. Fixed frames in existing structures are complex, which further increases the volume of the cylindrical battery module and is inconvenient to assemble, thereby lifting high production costs. In addition, during an operation of the battery module, due to a large heat generation, there are greater safety risks, which affects safety of the cylindrical battery module, and cooling devices in existing structures have large structures, which will further affect the volume of the cylindrical battery module. Due to a large number of the cells, problems such as cell fixation, cell protection, and cell cooling have increased difficulty of solving. An example of a cylindrical battery module is provided in document WO 2007/076985 A2 or in document CN 105 914 320 A. SUMMARY A cylindrical battery module is provided in the present disclosure, in which, a space utilization can be improved, an energy density of the cylindrical battery module is increased, and a cooling effect is improved. A cylindrical battery module is provided as defined in claim 1. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exposed view of a cylindrical battery module provided in an embodiment of the present disclosure.FIG. 2 is an enlarged view of a part A in FIG. 1.FIG. 3 is an enlarged view of a part B in FIG. 1.FIG. 4 is a schematic structural view of a second structural adhesive layer provided on a bracket in an embodiment of the present disclosure.FIG. 5 is an enlarged view of a part C in FIG. 1.FIG. 6 is a schematic structural view of the cylindrical battery module provided in an embodiment of the present disclosure.FIG. 7 is a schematic structural view of a water-cooled unit provided in an embodiment of the present disclosure.FIG. 8 is an enlarged view of a part D in FIG. 7.FIG. 9 is lateral view of the water-cooled unit provided in an embodiment of the present disclosure. FIG. 10 is an enlarged view of a part E in FIG. 9.FIG. 11 is a schematic structural view showing an internal structure of a water chamber provided in an embodiment of the present disclosure.FIG. 12 is a schematic structural view of a keel provided in an embodiment of the present disclosure.FIG. 13 is an enlarged view of a part F in FIG. 12. Reference numerals: 100, cell assembly; 101, cylindrical cell;1, keel; 11, lightening hole; 12, buckle; 13, circular groove;2, cooling plate; 21, arc groove; 22, first inserting portion; 23, port; 241, first pipe; 242, second pipe; 25, tube coupling assembly; 251, first water inlet coupling; 252, first water outlet coupling; 253, second water inlet coupling; 254, second water outlet coupling; 26, water chamber; 261, first partial chamber; 262, second partial chamber; 263, third partial chamber; 264, fourth partial chamber; 265, first partition; 266, second partition; 267, first subsection; 268, second subsection; 271, inlet end; 272, outlet end;3, bracket; 31, fixing hole; 311, gluey groove; 312, second structural adhesive layer; 32, connecting piece; 33, insulating bar;4, cover plate; 41, recess; 42, second inserting portion;5, insulation sheet;6, busbar;7, FPC board;81, positive output pole;9, metal reinforcing sheet;10, sealing member. DETAILED DESCRIPTION OF THE EMBODIMENT In description of the present disclosure, unless otherwise specified and defined, terms "connected with", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or a whole; it may be a mechanical connection or an electrical connection; it may be a directly connection or an indirectly connection through an intermediate media; and it may be an internal communication of two components or an interaction relationship between two components. For those skilled in the art, meanings of the above terms in the present disclosure can be understood according to situations. In the present disclosure, unless otherwise specified and defined, a first feature is disposed "on" or "under" a second feature may include a direct contact between the first feature and the second feature, or a contact between the first feature and the second feature through other features rather than the direct contact. Moreover, that the first feature is disposed "up", "above", and "on" the second feature includes that the first feature is right above or obliquely above the second feature, or only indicate that a horizontal heigh