Cylindrical battery module

1 . A cylindrical battery module, comprising:

at least two rows of cell assemblies, the cell assemblies in each row comprising a plurality of cylindrical cells arranged along a first direction;

two brackets disposed at two sides of the at least two rows of cell assemblies along a second direction, wherein each of the brackets is provided with a plurality of fixing holes, and each of the cylindrical cells is plugged into two corresponding ones of the fixing holes on the two brackets; and

a cooling plate clamped between adjacent rows of the cell assemblies, wherein the cooling plate is provided with a plurality of arc grooves arranged at intervals and along the first direction, a first inserting portion is formed between two adjacent ones of the arc grooves, the plurality of arc grooves are respectively mated with the plurality of cylindrical cells of the cell assemblies in one row, and the first inserting portion is inserted into a gap between two adjacent ones of the cylindrical cells of the cell assemblies in the one row;

wherein the cooling plate is annular, an inlet end and an outlet end of the cooling plate are disposed adjacent to each other, and both the inlet end and the outlet end are disposed at a middle portion of the cooling plate in the first direction.

2 . The cylindrical battery module of claim 1 , further comprising a packing structure, wherein the packing structure comprises keels, two adjacent ones of the cylindrical cells of the cell assemblies in at least one row are provided with one of the keels therebetween, and a first structural adhesive layer is provided between the keels and the cylindrical cells; or

wherein the cylindrical battery module further comprises a packing structure, the packing structure comprises a plurality of sealant structures, and each of the sealant structures is filled between two adjacent ones of the cylindrical cells in at least one row of the cell assemblies.

3 . The cylindrical battery module of claim 2 , wherein the keels are hollow structures, and the keels and the brackets are detachably connected or bonded.

4 . The cylindrical battery module of claim 1 , further comprising cover plates, wherein the cover plates are disposed on end portions of the at least two rows of cell assemblies along a third direction, and the third direction is perpendicular to the first direction and the second direction.

5 . The cylindrical battery module of claim 1 , wherein the at least two rows of cell assemblies comprise cell assemblies arranged in first rows adjacent to the cover plates, the cover plates are provided with a plurality of recesses, a second inserting portion is formed between two adjacent ones of the recesses, the plurality of recesses are mated with the plurality of cylindrical cells, and the second inserting portion is inserted into the gap between two adjacent ones of the cylindrical cells.

6 . The cylindrical battery module of claim 4 , wherein the at least two rows of cell assemblies comprise cell assemblies arranged in first rows adjacent to the cover plates, and the cover plates are flat plates.

7 . The cylindrical battery module of claim 4 , wherein the cylindrical battery module comprises the cell assemblies arranged in at least three rows, the cooling plate comprises a first cooling plate and a second cooling plate; the cell assemblies in a first row are disposed between a corresponding one of the cover plate and the first cooling plate, a contact area between the first cooling plate and the cell assemblies in the first row is a first contact area; and

the cell assemblies 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 in the second row is a second contact area; and the first contact area is greater than the second contact area.

8 . The cylindrical battery module of claim 7 , wherein heat insulation members are provided on the arc grooves of the first cooling plate adjacent to the cell assemblies in the second row.

9 . The cylindrical battery module of claim 2 , wherein the cylindrical cells and the fixing holes are bonded or detachably connected.

10 . The cylindrical battery module of claim 9 , wherein sides of the fixing holes adjacent to the cylindrical cells are provided with gluey grooves, a second structural adhesive layer is disposed on the gluey grooves, and the cylindrical cells are connected to the fixing holes through the second structural adhesive layer.

11 . The cylindrical battery module of claim 2 , further comprising busbars disposed on the two sides of the at least two rows of cell assemblies along the second direction, wherein the busbars are welded to poles of the cylindrical cells, the brackets are provided with slots, and the busbars are disposed on the slots.

12 . The cylindrical battery module of claim 11 , further comprising two flexible circuit FPC boards, each of the FPC boards is disposed between a corresponding one of the busbars and a corresponding one of the brackets, each of the FPC boards is welded to the corresponding one of the busbars and fixed with the corresponding one of the brackets.

13 . The cylindrical battery module of claim 2 , wherein the brackets are provided with connecting pieces configured to connect external boxes.

14 . The cylindrical battery module of claim 13 , further comprising two insulation sheets, wherein the two insulation sheets are respectively connected to the two brackets located at two sides of the two insulation sheets.

15 . The cylindrical battery module of claim 14 , further comprising a metal reinforcing sheet and a compressed foam disposed at both sides of each of the insulation sheets, wherein the compressed foam is disposed between a corresponding one of the brackets and a corresponding one of the insulation sheets.

16 . The cylindrical battery module of claim 2 , wherein surfaces of the cooling plate are provided with insulating paint layers.

17 . The cylindrical battery module of claim 2 , wherein the plurality of arc grooves are alternately defined on both sides of the cooling plate, and the plurality of arc grooves on the both sides of the cooling plate are matched, respectively, with the plurality of cylindrical cells of the cell assemblies in two adjacent rows.

18 . The cylindrical battery module of claim 1 , wherein every two adjacent rows of the cell assemblies are provided with the cooling plate therebetween, and the number of the cooling plates is less than the number of rows of the cell assemblies; and

wherein the cooling plate comprises a first pipe and a second pipe, both the first pipe and the second pipe are annular, the first pipe and the second pipe are arranged side by side in a length direction of the cylindrical cells, and the first pipe and the second pipe are configured such that a coolant in the first pipe and a coolant in the second pipe circulate in opposite directions.

19 . The cylindrical battery module of claim 18 , wherein the cooling plate is equipped with a tube coupling assembly and a water chamber;

wherein the tube coupling assembly comprises a first water outlet coupling, a first water inlet coupling, a second water outlet coupling, and a second water inlet coupling, an outlet end and an inlet end of the first pipe are connected to the first water outlet coupling and the first water inlet coupling, respectively, and an outlet end and an inlet end of the second pipe are connected to the second water outlet coupling and the second water inlet coupling, respectively; and

wherein the water chamber is divided into a first partial chamber, a second partial chamber, a third partial chamber, and a fourth partial chamber, the first partial chamber is communicated with the first water outlet coupling and a water outlet port of the first pipe, the second partial chamber is communicated with the first water inlet coupling and a water inlet port of the first pipe, the third partial chamber is communicated with the second water inlet coupling and a water inlet port of the second pipe, and the fourth partial chamber is communicated with the second water outlet coupling and a water outlet port of the second pipe.

20 . The cylindrical battery module of claim 1 , further comprising a plurality of keels arranged at intervals in the first direction, wherein one of the keels is disposed between two adjacent cylindrical cells of the cylindrical cells in at least one row of the cell assemblies, and the one of the keels is connected to the two adjacent cylindrical cells through a first structural adhesive layer;

wherein each of the keels is provided with a plurality of lightening holes, and an extension direction of each of the lightening holes is perpendicular to an extension direction of each of the cylindrical cells; and/or

in a length direction of each of the keels, both ends of each of the keels are each provided with at least one buckle, each of the brackets is provided with at least one slot matching the at least one buckle, and the at least one buckle is engaged within the at least one slot.