Cooling structure of cylindrical battery pack and cylindrical battery pack

Abstract

The utility model discloses a cylindrical battery pack cooling structure and cylindrical battery pack, the cooling structure comprises a hollow box body, the bottom of the box body is provided with strip-shaped clamping grooves, a plurality of clamping grooves are equidistantly arranged on a bottom plate side by side, and a relatively protruding support table is formed between every two adjacent clamping grooves. The width of the supporting table is smaller than the diameter of a to-be-assembled cylindrical battery. Clamping grooves are formed in the supporting table, heat dissipation plates are vertically clamped in the clamping grooves, arc-shaped inwards-concave limiting grooves are concentrically formed in the opposite side faces of every two adjacent heat dissipation plates in pairs, the arc diameter of the limiting grooves is matched with the diameter of a cylindrical battery to be assembled, the limiting grooves are formed in the heat dissipation plates in a vertically upward penetrating mode, and the lower end faces of the limiting grooves are matched with the height of the table top of the supporting table; a hollow cooling flow channel, and a cooling liquid inlet and a cooling liquid outlet which are communicated with the cooling flow channel at the two ends in the length direction are formed in the heat dissipation plate. The cooling structure and the cylindrical battery pack provided by the utility model have the advantages of reasonable structural design, high heat exchange efficiency, good heat dissipation effect and the like.

Description

Technical Field

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

[0002] At present, with the rapid development of the new energy industry, society's requirements for the energy density, safety performance, and fast charging performance of lithium-ion batteries have been further improved. As a highly recognized solution, large cylindrical batteries have ushered in a broad market space. Usually, single cells are usually assembled in the form of battery modules. Battery modules generate a lot of heat during the charging and discharging process, which will cause thermal runaway of the single cells inside the battery module, resulting in very serious uneven temperature distribution between the single cells, resulting in performance mismatch between the single cells, and further leading to premature failure of the battery module. Therefore, how to dissipate heat from the battery pack has become an urgent problem to be solved. 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 cooling structure and a cylindrical battery pack with reasonable structural design, high heat exchange efficiency and good heat dissipation effect.

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

[0005] A cooling structure for a cylindrical battery pack, characterized in that it includes a hollow box body, the bottom of the box body has a strip-shaped card slot, and a plurality of the card slots are equidistantly arranged side by side on the box body, and a relatively protruding support platform is formed between two adjacent card slots, and the width of the support platform is smaller than the diameter of the cylindrical battery to be assembled; a heat sink is vertically clamped in the card slot, and arc-shaped concave limiting grooves are concentrically arranged in pairs on the opposite sides of two adjacent heat sinks, the arc diameter of the limiting groove matches the diameter of the cylindrical battery to be assembled, and is vertically upwardly penetrated on the heat sink, and the lower end surface of the limiting groove matches the table height of the support platform; a cooling channel is formed in the heat sink, and a coolant inlet and a coolant outlet are connected to the cooling channel at both ends in the length direction.

[0006] In the above structure, since the heat sink adopts a hollow structure to form a cooling channel, each surface of the heat sink can form a heat dissipation surface. At the same time, there are concentrically arranged limit grooves between two adjacent side plates, and the limit grooves are upwardly connected, and the lower end surface is matched with the height of the support table surface, so that the outer surface of the cylindrical battery placed in the two limit grooves can contact the heat sink, and the outer ring of the bottom of the cylindrical battery is in contact with the lower end surface of the limit groove, so that the outer surface and bottom surface of the cylindrical battery have good heat transfer with the heat sink, so that the side and bottom surfaces of the cylindrical battery can be cooled at the same time, and the cooling effect is better.

[0007] Furthermore, the lower end surface of the limiting groove is lower than the table surface of the supporting platform, and the heat dissipation plate is provided with a thermally conductive structural adhesive for filling the gap.

[0008] In this way, after the cylindrical battery is placed between the two heat sinks, the weight of the battery acts on the box through the support platform, thereby preventing the heat sink from being deformed due to pressure, which is beneficial to extending the service life. In addition, filling the gap with thermal conductive structural adhesive can not only make up for the height difference between the two, but also ensure more reliable heat conduction. At the same time, it can also reduce the processing accuracy requirements of the support platform and the limit groove, thereby reducing production costs.

[0009] Furthermore, the support platform has a through hole that can be directly opposite to the explosion-proof valve of the cylindrical battery, and the through hole is correspondingly arranged between the two paired limiting grooves.

[0010] When assembling batteries, you can align the explosion-proof valve at the bottom of the battery with the through-hole. Once individual batteries explode due to malfunction, the gas ejected from the explosion-proof valve can be discharged from the through-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 support platform has a bottom groove formed by a depression, 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 through hole is located on one side in the width direction of the support platform and is semicircular.

[0014] Furthermore, the limiting grooves on both sides of the heat dissipation plate are staggered along the length direction of the heat dissipation plate, and the staggered distance is half of the center distance between two adjacent limiting grooves.

[0015] A cylindrical battery pack, characterized in that it includes the cooling structure of the cylindrical battery pack as described above, and cylindrical batteries are vertically placed in the pairs of limiting grooves on two adjacent heat dissipation plates.

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

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

[0018] Figure 2 It is a schematic diagram of the structure of the box.

[0019] Figure 3 It is a structural schematic diagram of the heat sink.

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the cylindrical battery, heat sink and support platform in coordination. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the embodiments.

[0022] When implementing: Figure 1 to Figure 4 As shown, a cylindrical battery pack comprises a hollow box body 1, the bottom of the box body 1 has a strip-shaped card slot, a plurality of the card slots are arranged side by side at equal distances on the box body 1, a relatively protruding support platform is formed between two adjacent card slots, and the width of the support platform is smaller than the diameter of the cylindrical battery to be assembled; a heat sink 8 is vertically clamped in the card slot, and arc-shaped concave limiting grooves 81 are concentrically arranged in pairs on the opposite sides of two adjacent heat sinks 8, the arc diameter of the limiting groove 81 matches the diameter of the cylindrical battery to be assembled, and along The limiting groove 81 is vertically and upwardly penetrated on the heat sink 8, and the lower end surface 82 of the limiting groove 81 matches the table top height of the support table; the limiting grooves on both sides of the heat sink 8 are staggered along the length direction of the heat sink 8, and the staggered distance is half of the center distance between two adjacent limiting grooves; cylindrical batteries 2 are vertically placed in the paired limiting grooves on two adjacent heat sinks 8; the heat sink 8 has a hollow cooling channel, and the two ends in the length direction are connected to the cooling channel.

[0023] In this embodiment, the lower end surface of the limit groove is lower than the table surface of the support platform, and the heat sink 8 is provided with a heat-conducting structural adhesive for filling the gap. In this way, after the cylindrical battery is placed between the two heat sinks, the weight of the battery acts on the box through the support platform, thereby preventing the heat sink from being deformed due to pressure, which is beneficial to prolonging the service life. In addition, filling the gap with a heat-conducting structural adhesive can not only make up for the height difference between the two, but also ensure more reliable heat conduction. At the same time, it can also reduce the processing accuracy requirements of the support platform and the limit groove, thereby reducing production costs.

[0024] The support platform has a through hole 13 that can be directly opposite to the explosion-proof valve of the cylindrical battery, and the through hole 13 is correspondingly arranged between the two pair of limit grooves; the through hole has a bottom groove formed by a depression on one side away from the support platform, and the bottom groove is connected to the plurality of through holes. In this embodiment, the through hole is located on one side of the support platform in the width direction and is semicircular.

[0025] In this embodiment, since the heat sink adopts a hollow structure to form a cooling channel, each surface of the heat sink can form a heat sink. At the same time, there are concentrically arranged limit grooves between two adjacent side plates, and the limit grooves are upwardly connected, and the lower end surface is matched with the height of the support table surface, so that the outer surface of the cylindrical battery placed in the two limit grooves can contact the heat sink, and the outer ring of the bottom of the cylindrical battery is in contact with the lower end surface of the limit groove, so that the outer surface and bottom surface of the cylindrical battery have good heat transfer with the heat sink, so that the side and bottom surfaces of the cylindrical battery can be cooled at the same time, and the cooling effect is better.

[0026] 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 cooling structure for a cylindrical battery pack, characterized in that: The invention comprises a hollow box body (1), the bottom of the box body (1) having a strip-shaped card slot, a plurality of the card slots being arranged side by side at equal intervals on the box body (1), a relatively protruding support platform being formed between two adjacent card slots, the width of the support platform being smaller than the diameter of the cylindrical battery to be assembled; a heat sink (8) is vertically carded in the card slot, arc-shaped inwardly concave limiting grooves are concentrically arranged in pairs on opposite sides of two adjacent heat sinks (8), the arc diameter of the limiting grooves matches the diameter of the cylindrical battery to be assembled, and the limiting grooves are vertically upwardly penetrated on the heat sink (8), and the lower end surface of the limiting grooves matches the table height of the support platform; the heat sink (8) has a cooling channel formed in a hollow, and a cooling liquid inlet and a cooling liquid outlet are connected to the cooling channel at both ends in the length direction.

2. The cooling structure of the cylindrical battery pack according to claim 1, characterized in that: The lower end surface of the limiting groove is lower than the table surface of the support table, and the heat dissipation plate (8) is provided with a heat-conducting structural adhesive for filling the gap.

3. The cooling structure of the cylindrical battery pack according to claim 1, characterized in that: The support platform is provided with a through hole which can be directly opposite to the explosion-proof valve of the cylindrical battery, and the through hole is correspondingly arranged between the two paired limiting grooves.

4. The cooling structure of the cylindrical battery pack according to claim 3, characterized in that: A side of the through hole away from the support platform has a bottom groove formed by a depression, and the bottom groove is connected to the plurality of through holes.

5. The cooling structure of the cylindrical battery pack according to claim 3, characterized in that: The through hole is located at one side of the support platform in the width direction and is semicircular.

6. The cooling structure of the cylindrical battery pack according to claim 1, characterized in that: The limiting grooves on both sides of the heat dissipation plate (8) are staggered along the length direction of the heat dissipation plate (8), and the staggered distance is half of the center distance between two adjacent limiting grooves.

7. A cylindrical battery pack, characterized in that: A cooling structure for a cylindrical battery pack according to any one of claims 1 to 6, wherein cylindrical batteries (2) are vertically placed in pairs of limiting grooves on two adjacent heat dissipation plates (8).

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