Bottom cooling structure of cylindrical battery pack and cylindrical battery pack

Abstract

The utility model discloses a bottom cooling structure of a cylindrical battery pack and the cylindrical battery pack, the bottom cooling structure comprises a hollow box body, the bottom of the box body is provided with a plurality of strip-shaped grooves for vertically placing cylindrical batteries, and the strip-shaped grooves are arranged side by side; a strip-shaped lower cooling plate is laid in the strip-shaped groove, and the thickness of the lower cooling plate is smaller than the depth of the strip-shaped groove. The lower cooling plate is internally provided with a hollow cooling flow channel, and the two ends of the lower cooling plate are provided with a cooling liquid inlet and a cooling liquid outlet which are communicated with the cooling flow channel. The bottom cooling structure and the cylindrical battery pack provided by the utility model have the advantages of reasonable structural design, high heat dissipation efficiency, facilitation of improving the cooling effect and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to a bottom cooling structure of a cylindrical battery pack and the cylindrical battery pack. Background Art

[0002] The common cooling structure of existing cylindrical battery packs is to use a serpentine liquid cooling plate on the side of the battery cell for cooling, and the top and bottom of the battery are not cooled. However, for large-capacity, large-diameter, and high-rate cylindrical battery packs, due to the large diameter of the battery and the small thermal conductivity of the winding core in the radial direction, most of the heat of the battery is conducted along the axial direction, so that the heat of the battery is mainly concentrated on the top and bottom. If the side serpentine lower cooling plate is still used for cooling, the heat dissipation efficiency will be greatly reduced, the temperature difference of the battery will increase, and the cooling effect will be poor. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a bottom cooling structure and a cylindrical battery pack with reasonable structural design, high heat dissipation efficiency and conducive to improving the cooling effect.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A bottom cooling structure for a cylindrical battery pack, characterized in that it comprises a hollow box body, the bottom of the box body having a strip groove for vertically placing cylindrical batteries, wherein a plurality of the strip grooves are arranged side by side; a strip-shaped lower cooling plate is laid in the strip groove, and the thickness of the lower cooling plate is less than the depth of the strip groove; the lower cooling plate has a hollow cooling channel, and has a coolant inlet and a coolant outlet at both ends that are connected to the cooling channel.

[0006] In the above structure, the thickness of the lower cooling plate is less than the depth of the strip groove, and it is laid in the strip groove. The bottom of the cylindrical battery placed vertically in the strip groove can contact the lower cooling plate, and the heat generated by the cylindrical battery can be transferred to the bottom along the axial direction, and finally conducted to the lower cooling plate. The heat is taken away by the coolant in the cooling channel to achieve liquid cooling. This structure makes full use of the high axial thermal conductivity of the cylindrical battery to quickly dissipate heat and improve the cooling effect. In addition, since multiple lower cooling plates are arranged in strips, each lower cooling plate can be independently temperature controlled, thereby achieving the most efficient heat dissipation.

[0007] Furthermore, the width of the strip groove is smaller than the diameter of the cylindrical battery to be assembled, and the two side walls of the strip groove are provided with arc-shaped concave positioning grooves, and the arc diameter of the positioning grooves matches the diameter of the cylindrical battery to be assembled; the bottom of the positioning groove is higher than the lower cooling plate, so that there is a gap between the bottom of the cylindrical battery placed on the positioning grooves on both sides and the lower cooling plate for filling with thermal conductive structural adhesive.

[0008] In this way, the positioning grooves on both sides of the strip groove are higher than the lower cooling plate, so that the weight of the cylindrical battery is completely applied to the box structure, thereby preventing the lower cooling plate from being deformed due to force. In addition, the gap between the bottom of the cylindrical battery and the lower cooling plate can be filled with thermal conductive structural adhesive. While ensuring the heat conduction efficiency, the thermal conductive structural adhesive can also be used to compensate for the processing errors of the lower cooling plate and the box, thereby reducing the precision requirements for the lower cooling plate and the box and reducing production costs.

[0009] Furthermore, the bottom of the strip groove has a through hole corresponding to the assembly position of the cylindrical battery, and the lower cooling plate has a hollow hole that can be opposite to the explosion-proof valve of the cylindrical battery, and the projection of the hollow hole is located in the corresponding through hole.

[0010] In this way, the overall weight of the box can be reduced through the through hole. In addition, since the hollow hole can be directly opposite to the explosion-proof valve of the cylindrical battery, and the projection of the hollow hole is located in the through hole, the explosion-proof valve of the cylindrical battery can be directly opposite to the hollow hole during assembly. Once an individual battery explodes due to a fault, the gas ejected from the explosion-proof valve can be discharged from the hollow hole, reducing the risk of further damage and improving the overall safety of the battery pack.

[0011] Furthermore, a side of the through hole away from the strip groove has a bottom groove extending along the length direction of the strip groove, and the bottom groove is connected to the plurality of through holes.

[0012] In this way, by connecting multiple through holes through the bottom groove, the space of the pressure relief channel can be increased, so that the gas ejected from the battery explosion-proof valve can be better relieved to prevent thermal runaway.

[0013] Furthermore, the hollow hole is located on one side in the width direction of the lower cooling plate and is semicircular.

[0014] Furthermore, both sides of the box body have through holes arranged opposite to the coolant inlet and the coolant outlet, and cooling pipes correspondingly connected to the coolant inlet and the coolant outlet are passed through.

[0015] A cylindrical battery pack, characterized in that it includes the bottom cooling structure of the cylindrical battery pack as described above; the strip grooves and the lower cooling plate are sprayed or paved with thermal conductive structural adhesive, and cylindrical batteries are arranged vertically.

[0016] In summary, the bottom cooling structure and cylindrical battery pack of the present invention have the advantages of reasonable structural design, high heat dissipation efficiency, and are beneficial to improving the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the decomposition structure of this embodiment.

[0018] Figure 2 It is a schematic structural diagram of the cross-sectional state of this embodiment.

[0019] Figure 3 It is a schematic diagram of the structure of the box.

[0020] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure.

[0021] Figure 5 Schematic diagram of the structure of the lower cooling plate.

[0022] Figure 6 Schematic diagram of the assembly structure of cylindrical batteries, lower cooling plate and box body. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with an embodiment of a cylindrical battery pack.

[0024] When implementing: Figure 1 to Figure 6 As shown, a cylindrical battery pack comprises a hollow box body 1 and a cylindrical battery 2, wherein the bottom of the box body 1 has a strip groove 11 for vertically placing the cylindrical battery, and a plurality of the strip grooves 11 are arranged side by side; a strip-shaped lower cooling plate 3 is laid in the strip groove 11, and the thickness of the lower cooling plate 3 is less than the depth of the strip groove; the lower cooling plate 3 has a hollow cooling channel, and both ends have a coolant inlet and a coolant outlet connected to the cooling channel, and both sides of the box body 1 have through holes arranged opposite to the coolant inlet and the coolant outlet, and cooling pipes correspondingly connected to the coolant inlet and the coolant outlet are penetrated.

[0025] Specifically, the width of the strip groove 11 is smaller than the diameter of the cylindrical battery to be assembled, and the two side walls of the strip groove are provided with arc-shaped concave positioning grooves 12, and the arc diameter of the positioning groove 12 matches the diameter of the cylindrical battery; the positioning groove 11 is set to pass upward from the middle of the strip groove, and the bottom is higher than the lower cooling plate 3.

[0026] The bottom of the strip groove 11 has a through hole 13 corresponding to the assembly position of the cylindrical battery. The side of the through hole 13 away from the strip groove has a bottom groove extending along the length direction of the strip groove, and the bottom groove is connected to multiple through holes. The lower cooling plate 3 has a hollow hole 32 that can be directly opposite to the explosion-proof valve of the cylindrical battery, and the projection of the hollow hole 32 is located in the corresponding through hole. In this embodiment, the hollow hole 32 is located on one side of the lower cooling plate 3 in the width direction and is semicircular, such as Figure 5 shown.

[0027] like Figure 6 As shown, the strip grooves and the lower cooling plate 3 are sprayed or paved with thermal conductive structural adhesive, and cylindrical batteries 2 are arranged vertically, the explosion-proof valves of the cylindrical batteries 2 are directly opposite to the hollow holes 32 on the lower cooling plate 3, and the bottom edges of the cylindrical batteries 2 are supported and placed at the bottom of the two positioning grooves, and the thermal conductive structural adhesive is filled in the gap between the bottom of the cylindrical battery and the lower cooling plate 3.

[0028] The battery pack of this embodiment makes full use of the high axial thermal conductivity of the cylindrical battery and sets the cooling plate at the bottom of the cylindrical battery. At the same time, in terms of structure, the weight of the cylindrical battery is applied to the box through the positioning groove, so as to avoid the lower cooling plate from being compressed and deformed. In addition, the gap between the bottom of the cylindrical battery and the lower cooling plate is filled with thermally conductive structural adhesive. While ensuring the thermal conductivity efficiency, the processing accuracy of the strip groove and the lower cooling plate is also reduced, which is conducive to reducing costs. In order to prevent individual batteries from exploding due to malfunctions, hollow holes are set on the lower cooling plate, and through holes are set on the box to form a pressure relief channel to prevent thermal runaway.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bottom cooling structure of a cylindrical battery pack, characterized in that: The invention comprises a hollow box body (1), wherein the bottom of the box body (1) has a strip groove for vertically placing cylindrical batteries, and a plurality of the strip grooves are arranged side by side; a strip-shaped lower cooling plate (3) is laid in the strip groove, and the thickness of the lower cooling plate (3) is less than the depth of the strip groove; the lower cooling plate (3) has a hollow cooling channel, and has a cooling liquid inlet and a cooling liquid outlet at both ends that are connected to the cooling channel.

2. The bottom cooling structure of the cylindrical battery pack according to claim 1, characterized in that: The width of the strip groove is smaller than the diameter of the cylindrical battery to be assembled, and the two side walls of the strip groove are provided with arc-shaped concave positioning grooves, and the arc diameter of the positioning groove matches the diameter of the cylindrical battery to be assembled; the bottom of the positioning groove is higher than the lower cooling plate (3), so that there is a gap filled with heat-conductive structural glue between the bottom of the cylindrical battery placed on the positioning grooves on both sides and the lower cooling plate (3).

3. The bottom cooling structure of a cylindrical battery pack according to claim 1 or 2, characterized in that: The bottom of the strip groove has a through hole corresponding to the assembly position of the cylindrical battery, and the lower cooling plate (3) has a hollow hole (32) that can be directly opposite to the explosion-proof valve of the cylindrical battery, and the projection of the hollow hole (32) is located in the corresponding through hole.

4. The bottom cooling structure of the cylindrical battery pack according to claim 3, characterized in that: A side of the through hole away from the strip groove has a bottom groove extending along the length direction of the strip groove, and the bottom groove is connected to the plurality of through holes.

5. The bottom cooling structure of the cylindrical battery pack according to claim 3, characterized in that: The hollow hole (32) is located on one side of the lower cooling plate (3) in the width direction and is semicircular.

6. The bottom cooling structure of the cylindrical battery pack according to claim 1, characterized in that: Both sides of the box body (1) are provided with through holes arranged opposite to the coolant inlet and the coolant outlet, and are penetrated by cooling pipes correspondingly connected to the coolant inlet and the coolant outlet.

7. A cylindrical battery pack, characterized in that: The bottom cooling structure of the cylindrical battery pack comprises the bottom cooling structure of any one of claims 1 to 6; the strip grooves and the lower cooling plate (3) are sprayed or paved with thermal conductive structural adhesive, and cylindrical batteries (2) are arranged vertically.

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