Battery module and energy storage device

1. A battery module comprising:

at least two battery cells, each of the at least two battery cells having a respective top cover;

at least one bus-bar, each bus-bar of the at least one bus-bar being disposed above two respective adjacent top covers and electrically connected to poles disposed on the two adjacent top covers; and

a liquid cooling tube, arranged above all the top covers and cooperating with the at least one bus-bar for heat transfer, wherein the liquid cooling tube is installed between the top covers of the at least two battery cells and the at least one bus-bars,

wherein the liquid cooling tube comprises a liquid cooling tube body and a thermally conductive insulating layer, the thermally conductive insulating layer is installed on an outside of the liquid cooling tube body, and the thermally conductive insulating layer abuts against the at least one bus-bar,

wherein the liquid cooling tube body comprises a first liquid cooling tube section and a second liquid cooling tube section, the liquid cooling tube further comprises a liquid inlet connector, a liquid inlet collecting pipe, a liquid outlet connector and a liquid outlet collecting pipe, a second end of the first liquid cooling tube section is communicated with the liquid inlet collecting pipe, the liquid inlet connector is communicated with the liquid inlet collecting pipe, and a second end of the second liquid cooling tube section is communicated with the liquid outlet collecting pipe, and the liquid outlet collecting pipe is communicated with the liquid outlet connector,

wherein the battery module further comprises a box, the box comprises a first end plate and a second end plate, the first end plate or the second end plate is recessed to form two limiting installation parts, each of the two limiting installation parts comprises a first limiting part, the first limiting part is adapted to fit contours of local outer tube walls of the liquid inlet collecting pipe and the liquid outlet collecting pipe, and each of the two limiting installation parts further comprises a second limiting part, the second limiting part abuts against tube end walls of the liquid inlet collecting pipe and the liquid outlet collecting pipe, and

wherein each of the two limiting installation parts is a groove, the second limiting part is a step structure formed on at least one side wall of the groove, and after the liquid inlet collecting pipe is installed in the groove, a lower tube end wall of the liquid inlet collecting pipe is in precise lap-joint with the step structure, the step structure applies a limit in a −Z axis direction to the liquid inlet collecting pipe, and the bus-bars after being installed and fixed presses against a upper surface of the liquid cooling tube and synchronously apples a limit in a +Z axis direction to the liquid cooling tube.

2. The battery module according to claim 1 , wherein a width of the liquid cooling tube body ranges from 15 mm to 48 mm.

3. The battery module according to claim 1 , wherein the liquid cooling tube body is a flat tube, the flat tube has a first wide surface and a second wide surface opposite to each other, the first wide surface abuts against the top cover of each of the at least two battery cells, and the second wide surface abuts against the at least one bus-bar.

4. The battery module according to claim 1 , wherein the liquid cooling tube body further comprises a connecting tube section, a first end of the connecting tube section is communicated with a first end of the first liquid cooling tube section, a second end of the connecting tube section is communicated with a first end of the second liquid cooling tube section, the first liquid cooling tube section is arranged close to poles at one end of the battery cells, the second liquid cooling tube section is arranged close to poles at the other end of the battery cells, and the connecting tube section is arranged close to an edge of the battery module.

5. The battery module according to claim 1 , wherein the box comprises a first side plate and a second side plate, the first end plate, the first side plate, the second end plate and the second side plate are connected end-to-end and define an installation cavity, and all the battery cells are installed inside the installation cavity.

6. The battery module according to claim 5 , wherein the second end of the first liquid cooling tube section is formed with a first bent section that is bent toward a corresponding one of the two limiting installation parts, and the liquid inlet collecting pipe is installed at an extension part of the first bent section that is oriented towards the corresponding one of the limiting installation parts, and the liquid inlet collecting pipe is in limiting fit with the limiting installation part.

7. The battery module according to claim 6 , wherein the second end of the second liquid cooling tube section is formed with a second bent section that is bent toward another corresponding one of the two limiting installation parts, and the liquid outlet collecting pipe is installed at an extension part of the second bent section that is oriented toward the other corresponding limiting installation part, and the liquid outlet collecting tub is in limiting fit with the other corresponding limiting installation part.

8. The battery module according to claim 1 , wherein each of the two limiting installation parts further comprises a flared part, and the first end plate or the second end plate has a first side and a second side opposite in a thickness direction, and a width of the flared part transitions incrementally in a direction from the first side to the second side.

9. The battery module according to claim 8 , wherein the liquid inlet connector extends from a corresponding one of two flared parts of the two limiting installation parts and the liquid outlet connector extends from another corresponding one of the two flared parts.

10. An energy storage device comprising a battery module, wherein the battery module comprises:

at least two battery cells, each of the at least two battery cells having a respective top cover;

at least one bus-bar, each bus-bar of the at least one bus-bar being disposed above two respective adjacent top covers and electrically connected to poles disposed on the two adjacent top covers; and

a liquid cooling tube, arranged above all the top covers and cooperating with the at least one bus-bar for heat transfer, wherein the liquid cooling tube is installed between the top covers of the at least two battery cells and the at least one bus-bars,

wherein the liquid cooling tube comprises a liquid cooling tube body and a thermally conductive insulating layer, the thermally conductive insulating layer is installed on an outside of the liquid cooling tube body, and the thermally conductive insulating layer abuts against the at least one bus-bar,

wherein the liquid cooling tube body comprises a first liquid cooling tube section and a second liquid cooling tube section, the liquid cooling tube further comprises a liquid inlet connector, a liquid inlet collecting pipe, a liquid outlet connector and a liquid outlet collecting pipe, a second end of the first liquid cooling tube section is communicated with the liquid inlet collecting pipe, the liquid inlet connector is communicated with the liquid inlet collecting pipe, and a second end of the second liquid cooling tube section is communicated with the liquid outlet collecting pipe, and the liquid outlet collecting pipe is communicated with the liquid outlet connector,

wherein the battery module further comprises a box, the box comprises a first end plate and a second end plate, the first end plate or the second end plate is recessed to form two limiting installation parts, each of the two limiting installation parts comprises a first limiting part, the first limiting part is adapted to fit contours of local outer tube walls of the liquid inlet collecting pipe and the liquid outlet collecting pipe, and each of the two limiting installation parts further comprises a second limiting part, the second limiting part abuts against tube end walls of the liquid inlet collecting pipe and the liquid outlet collecting pipe, and

wherein each of the two limiting installation parts is a groove, the second limiting part is a step structure formed on at least one side wall of the groove, and after the liquid inlet collecting pipe is installed in the groove, a lower tube end wall of the liquid inlet collecting pipe is in precise lap-joint with the step structure, the step structure applies a limit in a −Z axis direction to the liquid inlet collecting pipe, and the bus-bars after being installed and fixed presses against a upper surface of the liquid cooling tube and synchronously apples a limit in a +Z axis direction to the liquid cooling tube.

11. The energy storage device according to claim 10 , wherein a width of the liquid cooling tube body ranges from 15 mm to 48 mm.

12. The energy storage device according to claim 10 , wherein the liquid cooling tube body is a flat tube, the flat tube has a first wide surface and a second wide surface opposite to each other, the first wide surface abuts against the top cover of each of the at least two battery cells, and the second wide surface abuts against the at least one bus-bar.

13. The energy storage device according to claim 10 , wherein the liquid cooling tube body further comprises a connecting tube section, a first end of the connecting tube section is communicated with a first end of the first liquid cooling tube section, a second end of the connecting tube section is communicated with a first end of the second liquid cooling tube section, the first liquid cooling tube section is arranged close to poles at one end of the battery cells, the second liquid cooling tube section is arranged close to poles at the other end of the battery cells, and the connecting tube section is arranged close to an edge of the battery module.

14. The energy storage device according to claim 10 , wherein the box comprises a first side plate and a second side plate, the first end plate, the first side plate, the second end plate and the second side plate are connected end-to-end and define an installation cavity, and all the battery cells are installed inside the installation cavity.

15. The energy storage device according to claim 14 , wherein the second end of the first liquid cooling tube section is formed with a first bent section that is bent toward a corresponding one of the two limiting installation parts, and the liquid inlet collecting pipe is installed at an extension part of the first bent section that is oriented towards the corresponding one of the limiting installation parts, and the liquid inlet collecting pipe is in limiting fit with the limiting installation part.

16. The energy storage device according to claim 15 , wherein the second end of the second liquid cooling tube section is formed with a second bent section that is bent toward another corresponding one of the two limiting installation parts, and the liquid outlet collecting pipe is installed at an extension part of the second bent section that is oriented toward the other corresponding limiting installation part and the liquid outlet collecting tub is in limiting fit with the other corresponding limiting installation part.

17. The energy storage device according to claim 10 , wherein each of the two limiting installation parts further comprises a flared part, and the first end plate or the second end plate has a first side and a second side opposite in a thickness direction, and a width of the flared part transitions incrementally in a direction from the first side to the second side.

18. The energy storage device according to claim 17 , wherein the liquid inlet connector extends from a corresponding one of two flared parts of the two limiting installation parts and the liquid outlet connector extends from another corresponding one of the two flared parts.