Heating sheet and battery module
A heating sheet and a battery module are provided. The battery module includes multiple battery cells and a heating sheet. The heating sheet includes multiple heating units and multiple connection units, and two adjacent heating units are coupled with each other through a connection unit. One heating unit may be attached to a side wall of one battery cell, and the connection unit corresponds to the gap region.
1. A battery module, comprising:
a plurality of battery cells; and
a heating sheet, wherein,
two adjacent battery cells are in contact with each other, and a gap region is defined between side walls of the two adjacent battery cells;
the heating sheet comprises a plurality of heating units and a plurality of connection units, two adjacent heating units are coupled with each other through a connection unit, a heating unit is attached to a side wall of a battery cell, and the connection unit corresponds to the gap region;
the heating unit comprises an insulating film and a heating wire laid on the insulating film, and the heating wire has an inflow end and an outflow end;
the connection unit comprises a first connection film and a first conductive wire laid on the first connection film, the outflow end of the heating unit is electrically coupled with the inflow end of an adjacent heating unit through the first conductive wire, and two insulating films of the two adjacent heating units are connected with each other through the first connection film;
the insulating film and the first connection film are located on the same plane parallel to the side wall of the battery cell, and the heating wire and the first conductive wire are located on the same plane parallel to the side wall of the battery cell;
the first conductive wire has a routing density less than the heating wire, or the first conductive wire has a cross-sectional area larger than the heating wire, such that the connection unit has a heat productivity per unit area less than the heating unit; and
the first conductive wire has a size larger than the heating wire in an extension direction of the gap region, and/or the first conductive wire has a width larger than the heating wire in a direction parallel to the side wall of the battery cell.
2. The battery module of claim 1 , wherein each of the plurality of connection units is provided with first connection films at two surfaces respectively.
3. The battery module of claim 2 , wherein the first conductive wire is only laid on part of the first connection film.
4. The battery module of claim 2 , wherein the first connection film only covers part of the gap region.
5. The battery module of claim 2 , wherein the first connection film defines at least one through hole, and the at least one through hole communicates with the gap region between the side walls of the two adjacent battery cells.
6. The battery module of claim 1 , wherein the first conductive wire is only laid on part of the first connection film.
7. The battery module of claim 6 , wherein the first connection film only covers part of the gap region.
8. The battery module of claim 6 , wherein the first connection film defines at least one through hole, and the at least one through hole communicates with the gap region between the side walls of the two adjacent battery cells.
9. The battery module of claim 1 , wherein the first connection film only covers part of the gap region.
10. The battery module of claim 1 , wherein the first connection film defines at least one through hole, and the at least one through hole communicates with the gap region between the side walls of the two adjacent battery cells.
11. The battery module of claim 10 , wherein the first connection film comprises two film strips, the two film strips are located at two ends of the insulating film in a width direction of the insulating film respectively, each of the two film strips has two ends connected with two insulating films respectively, and the two film strips and the two insulating films cooperatively define the through hole.
12. The battery module of claim 11 , wherein the through hole is defined in part of the first connection film where the heating wire is not laid.
13. The battery module of claim 10 , wherein the through hole is defined in part of the first connection film where the heating wire is not laid.
14. The battery module of claim 1 , wherein an extension direction of the first conductive wire is an arrangement direction of the plurality of battery cells.
15. The battery module of claim 1 , wherein each of the inflow end and the outflow end of the heating wire is located in the middle of the insulating film in a width direction of the insulating film.
16. The battery module of claim 1 , wherein the heating sheet is implemented as two heating sheets; and
the two heating sheets are attached to two opposite side walls of the battery cell respectively, and the heating wires of the two heating sheets are coupled with each other through a second conductive wire.
17. The battery module of claim 16 , wherein the insulating films of the two heating sheets are connected with each other through a second connection film, and the second conductive wire is laid on the second connection film.
18. The battery module of claim 16 , wherein the second conductive wire has a cross-sectional area larger than the heating wire.