CN218472071U

CN218472071U - Columnar battery core cooling device and battery pack

Info

Publication number: CN218472071U
Application number: CN202222455562.8U
Authority: CN
Inventors: 赵恒喜; 卢卿; 张本府; 李左营; 刘振雨; 丁涛; 陈涛
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-09-16
Filing date: 2022-09-16
Publication date: 2023-02-10
Anticipated expiration: 2032-09-16

Abstract

The utility model discloses a column electricity core cooling device and battery package belongs to battery cooling technical field. This column electricity core cooling device includes the liquid cooling pipe, and the surface of column electricity core can be located to the cover to the liquid cooling pipe, and the inner wall department of liquid cooling pipe is provided with the liquid cooling chamber, and the liquid cooling chamber runs through the liquid cooling pipe along the axial direction of liquid cooling pipe, and the liquid cooling chamber includes the fan-shaped cavity, and the paraxial limit of fan-shaped cavity is used for laminating column electricity core to transfer heat, and the fan-shaped cavity can flow and be equipped with the refrigerating fluid. Through setting up the liquid cooling chamber that is sector cavity, the sector cavity can flow and be equipped with the refrigeration liquid, and the paraxial limit of sector cavity can laminate column electricity core and conduct heat for can be through the shape and the size that rationally set up paraxial limit, closely laminate with the surface of column electricity core at this column electricity core cooling device, form great heat transfer area, have higher cooling efficiency. In addition, the columnar battery core cooling device is compact in structure, high in integration level, small in occupied space and capable of being flexibly installed in a battery pack.

Description

Columnar battery core cooling device and battery pack

Technical Field

The utility model relates to a battery cooling technology field especially relates to a column electricity core cooling device and battery package.

Background

The cylindrical battery cell is a common form of the battery cell, has good installation adaptability to battery packs of various shapes, and is widely applied to the fields of new energy automobiles and the like. Among the prior art, the cooling demand of cylinder electricity core is solved to the mode of usually adopting snakelike liquid cooling board to cylinder electricity core for cylinder electricity core can not be in overheated operating temperature because of the high temperature, leads to the not good safety problem even of performance. But the cooling efficiency of snakelike liquid cooling board is not good, is unfavorable for the cylinder electricity core to avoid overheated.

Based on the above, there is a need for a cylindrical battery cell cooling device and a battery pack, which can solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a column electricity core cooling device can prevent that column electricity core is overheated with higher efficiency cooling column electricity core.

To achieve the purpose, the utility model adopts the following technical proposal:

columnar battery core cooling device includes: the liquid cooling pipe is used for being sleeved on the outer surface of the columnar electric core, a liquid cooling cavity is arranged on the inner wall of the liquid cooling pipe, the liquid cooling cavity penetrates through the liquid cooling pipe along the axial direction of the liquid cooling pipe, the liquid cooling cavity comprises a sector-shaped cavity, the near axial edge of the sector-shaped cavity is used for being attached to the columnar electric core to conduct heat, and refrigerating liquid can flow in the sector-shaped cavity.

Optionally, at least two of the sector-shaped cavities are arranged on the inner wall of the liquid cooling pipe.

Optionally, a side plate is disposed on an inner wall surface of the liquid cooling tube, a heat transfer plate is disposed near an axial edge of the sector cavity, at least two adjacent side plates are hermetically connected to the heat transfer plate, the sector cavity is formed between a tube wall of the liquid cooling tube, the heat transfer plate and at least two adjacent side plates, and the heat transfer plate is used for being attached to the columnar cell for heat transfer.

Optionally, at least one support plate is further disposed in the sector-shaped cavity, the support plate extends along an axial direction of the liquid cooling tube, the support plate abuts against a tube wall of the liquid cooling tube and the heat transfer plate, and the support plate divides the sector-shaped cavity into at least two liquid cooling channels.

Optionally, at least two of the supporting plates are disposed in the sector-shaped cavity, and the at least two supporting plates are uniformly arranged with the axis of the liquid cooling pipe as a rotation center.

Optionally, at least one of the support plates is provided with a notch, and two of the liquid cooling channels located on both sides of the notch are communicated through the notch.

Optionally, the columnar cell cooling device further includes a liquid inlet joint and a liquid outlet joint, the liquid inlet joint and the liquid outlet joint are communicated with the liquid cooling cavity, the liquid inlet joint is located at one end of the liquid cooling pipe, and the liquid outlet joint is located at the other end of the liquid cooling pipe.

Optionally, a routing through groove is formed in the inner wall of the liquid cooling pipe, and the routing through groove penetrates through the columnar cell cooling device along the axial direction of the liquid cooling pipe.

The utility model provides a column electricity core cooling device's beneficial effect lies in: through the liquid cooling chamber that is fan-shaped cavity along inner wall department setting in the liquid cooling pipe, can flow in the fan-shaped cavity and be equipped with the refrigerating fluid, and the paraxial limit of fan-shaped cavity can laminate column electricity core and transfer heat for this column electricity core cooling device can closely laminate through shape and the size that rationally sets up paraxial limit, compares in traditional snakelike liquid cold plate can form bigger heat transfer area with the surface of column electricity core, has higher cooling efficiency. In addition, the columnar battery core cooling device is compact in structure, high in integration level, small in occupied space and capable of being flexibly installed in a battery pack.

Another object of the utility model is to provide a battery pack can prevent that column electricity core is overheated with higher efficiency cooling column electricity core wherein, leads to the not good safety problem of even appearing of battery pack performance.

the battery pack comprises a plurality of columnar battery cores and the columnar battery core cooling device, wherein the columnar battery core cooling device is sleeved on the plurality of columnar battery cores, and the columnar battery cores are attached to the near axial edge of the columnar battery core cooling device.

Optionally, the battery pack includes at least two of the above columnar electric core cooling devices, each of the above columnar electric core cooling devices is provided with one group of the above columnar electric cores, liquid paths of the refrigerant liquid of the two above columnar electric core cooling devices are in parallel connection, and circuits of the two groups of the above columnar electric cores are also in parallel connection.

The utility model provides a battery pack's beneficial effect lies in: through adopting above-mentioned column electricity core cooling device in the battery package, further increased the cooling area of column electricity core, improved the radiating efficiency to retrench the inner structure of battery package, improved battery package overall structure's integrated level, be more convenient for design, installation, maintenance and dismantlement.

Drawings

Fig. 1 is a perspective view of a columnar cell cooling device provided in the present invention;

fig. 2 is a bottom view of the columnar cell cooling device provided by the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a side view taken along the line B-B in FIG. 2;

fig. 5 is a front view of the columnar cell cooling device provided by the present invention;

FIG. 6 is a schematic view of the internal structure taken along the direction C-C in FIG. 5;

fig. 7 is an elevation view of the internal structure of the columnar cell cooling device with cells provided by the present invention;

FIG. 8 is a schematic view of the internal structure of FIG. 7 taken along the direction D-D;

fig. 9 is a partially enlarged view of the internal structure at E in fig. 7.

In the figure:

1. a liquid-cooled tube; 10. a liquid cooling chamber; 101. a liquid cooling flow passage; 11. a side plate; 12. a heat transfer plate; 13. a support plate; 131. a notch; 14. a wiring through groove; 15. a liquid inlet joint; 16. a liquid outlet joint;

2. an end cap;

3. and (5) a columnar battery cell.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, a fixed connection or a detachable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

The following describes the column-shaped cell cooling device and the battery pack provided by the present invention with reference to fig. 1 to 9.

Specifically, as shown in fig. 1 to 9, the columnar cell cooling device includes a liquid cooling pipe 1, and a liquid cooling cavity 10 is disposed at an inner wall of the liquid cooling pipe 1. The liquid cooling chamber 10 is a sector-shaped cavity and penetrates through the liquid cooling pipe 1 along the axial direction of the liquid cooling pipe 1, and the refrigerant can flow in the sector-shaped cavity along the axial direction of the liquid cooling pipe 1.

For convenience of discussion, the edges forming the sector-shaped cavity are referred to as a distal edge, a proximal edge and an end edge, respectively. Sector-shaped cavity refers to the cavity that has the paraxial limit that can laminate in 3 surfaces of column electricity core. For example, taking a cylindrical electrical core as an example, the proximal axial edges of the sector-shaped cavities are all arc segments, and when the liquid cooling tube 1 is a hollow circular tube, the distal axial edges thereof are also arc segments; when the liquid cooling pipe 1 is in a square pipe shape, the far axial side is a straight line section; when the liquid cooling pipe 1 is in a six-sided pipe shape, the far axial side can also be a broken line section formed by combining a plurality of straight line sections. Of course, when the prismatic battery cell 3 is selected as the columnar battery cell 3, the paraxial edge of the sector cavity may also be a straight line segment or a broken line segment. Therefore, the shape of the liquid cooling pipe 1, the specific shape of the sector-shaped cavity, and the specific shape of the columnar cell 3 are not limited in the present invention.

Moreover, the distance and the near between the far axial side and the near axial side only refer to the distance relationship between the far axial side and the near axial side relative to the axis of the liquid cooling pipe 1, and do not refer to the advantages and the disadvantages of arcs, nor the length and the length of the actual size; the end edge is not limited to the straight line segment, and a curved line segment can be adopted, the direction of the end edge is not limited to the normal direction along the far axis edge or the near axis edge, and the two end edges forming the sector shape are not required to be symmetrical or the same. As long as can form the closed figure of similar sector shape through distal axis limit, paraxial limit and two terminal edges, just belong to the utility model discloses in to the shape definition of sector shape cavity. For the convenience of narration, the utility model discloses in use cylinder electricity core to describe as the example the utility model provides a column electricity core cooling device and battery package, but the application scope of this column electricity core cooling device and battery package does not confine the cylinder electricity core to, as long as can make the nearly hub side laminating column electricity core 3's of sector shape cavity surface heat transfer, all belong to within the utility model discloses within the scope that will protect.

Exemplarily, in this embodiment, as shown in fig. 4 to 8, the liquid cooling pipe 1 is a hollow circular pipe, and a plurality of cylindrical battery cells are sleeved inside the hollow circular pipe. The inner circumferential surface of the liquid cooling pipe 1 is provided with two side plates 11, the inside of the liquid cooling pipe 1 is further provided with a heat transfer plate 12, the heat transfer plate 12 is an arc-shaped plate, the axial section of the arc-shaped plate forms the near axial edge and can be tightly attached to the surface of the cylindrical battery core, and the axial section of the pipe wall of the liquid cooling pipe 1 forms the far axial edge. Two curb plates 11 are installed at the inner peripheral surface of liquid cooling board along the axial direction of liquid cooling board, and sealing connection respectively in the both ends of above-mentioned arc for form foretell liquid cooling chamber 10 that is the sector cavity between the pipe wall of liquid cooling pipe 1, arc and two curb plates 11, and then form the liquid cooling pipe 1 that has above-mentioned liquid cooling chamber 10. Of course, when cooling the columnar electric core 3 with other shapes, the heat transfer plate 12 with other shapes may be adaptively adopted, which is not specifically limited in the present invention.

When the liquid cooling device is used, as shown in fig. 7 and 8, the liquid cooling pipes 1 are sleeved on the plurality of columnar battery cores 3, so that the paraxial edges (namely, the arc segments) of the sector-shaped cavities are attached to the surfaces of the columnar battery cores 3, heat generated by the columnar battery cores 3 is transferred to the refrigerant liquid flowing in the sector-shaped cavities through the heat transfer plates 12 forming the paraxial edges of the sector-shaped cavities, and then the heat is carried by the refrigerant liquid and transferred to other positions to be dissipated.

Of course, it should be noted that the liquid-cooled chamber 10 may be formed in other manners. For example, in some embodiments, a plurality of pipes with a sector-shaped cross section may be arranged and attached to the inner wall of the liquid cooling pipe 1, and a sector-shaped cavity is disposed in the plurality of pipes; in some other embodiments, the fan-shaped cavity may be formed directly in the inner wall of the liquid-cooled tube 1 by extrusion molding. Therefore, the utility model discloses in do not do specifically to the formation mode of sector shape cavity and restrict, as long as can form the sector shape cavity, the sector shape cavity can flow and be equipped with the refrigerating fluid, and the paraxial limit of sector shape cavity can laminate column electricity core 3 and transfer heat, just belong to within the utility model discloses within the within range that will protect.

Through the liquid cooling chamber 10 that is sector cavity in the inner wall department setting at liquid cooling pipe 1, the sector cavity can flow in and be equipped with the refrigerating fluid, and the paraxial limit of sector cavity can laminate column electricity core 3 and transfer heat, makes can closely laminate through the shape and the size that rationally set up paraxial limit at this column electricity core cooling device, with column electricity core 3's surface, compares and can form bigger heat transfer area in traditional snakelike liquid cold plate, has higher cooling efficiency. In addition, the columnar battery core cooling device is compact in structure, high in integration level, small in occupied space and capable of being flexibly installed in a battery pack.

Certainly, the utility model discloses in, do not specifically prescribe a limit to the quantity of liquid cooling chamber 10 in the liquid cooling pipe 1, can satisfy the heat dissipation needs of column electricity core 3 can.

Alternatively, in some embodiments that use a circular tube as the liquid cooling tube 1, a plurality of sector-shaped cavities are provided in the liquid cooling tube 1, the far axial sides of the sector-shaped cavities are minor arcs, and a plurality of liquid cooling cavities 10 are provided in the liquid cooling tube 1. The combination of a plurality of liquid cooling chamber 10 can also be laminated with at least half of the outer peripheral face of column electricity core 3 mutually, compares snakelike liquid cooling board, also can form bigger heat transfer area, has higher cooling efficiency.

For example, in the present embodiment, as shown in fig. 5 and 6, only one sector-shaped cavity is provided in the liquid-cooling tube 1, the far axial side of the sector-shaped cavity is the major arc, and only one liquid-cooling chamber 10 is provided in the liquid-cooling tube 1. This liquid cooling chamber 10 can laminate with at least half of the looks of the outer peripheral face of column electricity core 3, compares in snakelike liquid cooling board, can form bigger heat transfer area, has higher cooling efficiency.

Further, in the present embodiment, as shown in fig. 5 and fig. 6, at least one supporting plate 13 is further disposed in each sector-shaped cavity, the supporting plate 13 extends along the axial direction of the liquid cooling pipe 1, and the supporting plate 13 abuts between the pipe wall of the liquid cooling pipe 1 and the near axial edge of the sector-shaped cavity, which is beneficial to improving the structural strength of the liquid cooling pipe 1. Meanwhile, the supporting plate 13 divides the sector-shaped cavity into at least two liquid cooling runners 101, and the refrigerant liquid is guided to flow in the liquid cooling runners 101 along the axial direction of the liquid cooling pipe 1, so that conditions such as turbulence and the like in the flowing process of the refrigerant liquid can be avoided, the refrigerant liquid flows more smoothly, and the heat generated by the columnar battery core 3 can be discharged. Alternatively, in the present embodiment, as shown in fig. 6 and 8, the plurality of support plates 13 are uniformly arranged along the inner circumferential surface of the liquid cooling pipe 1 in the sector-shaped cavity, so that the structural strength of the liquid cooling pipe 1 can be further enhanced.

It should be noted that, for convenience of communicating the liquid cooling pipe 1 with the related liquid cooling pipeline, as shown in fig. 1 to fig. 3, the columnar cell cooling device further includes a liquid inlet connector 15 and a liquid outlet connector 16, the liquid inlet connector 15 and the liquid outlet connector 16 are communicated with the liquid cooling cavity 10, the liquid inlet connector 15 is located at one end of the liquid cooling pipe 1, and the liquid outlet connector 16 is located at the other end of the liquid cooling pipe 1. When the liquid cooling device is used, the liquid cooling pipe 1 can be quickly and conveniently communicated with a related liquid cooling pipeline through the liquid inlet connector 15 and the liquid outlet connector 16, so that the circulating flow of the refrigerant liquid is realized. Of course, the liquid cooling pipe 1 can be connected to the associated liquid cooling pipeline in other ways, such as by direct welding. Therefore the utility model discloses in, do not specifically inject how to communicate this liquid cooling pipe 1 to relevant liquid cooling pipeline, as long as can cooperate relevant liquid cooling pipeline, realize the inflow outflow of refrigerating fluid can.

For example, as shown in fig. 2 and 3, in the present embodiment, the arc-shaped plates (i.e., the heat transfer plates 12), the side plates 11, and the tube walls of the liquid-cooling tube 1 are protruded from both ends of the liquid-cooling tube 1, so as to form a liquid-cooling flow passage 101 capable of being partially protruded from the end of the liquid-cooling tube 1. The liquid inlet joint 15 or the liquid outlet joint 16 is mounted on the arc-shaped plate of the protruding part of the liquid cooling flow channel 101, so that the liquid inlet joint 15 or the liquid outlet joint 16 is mounted in the axial direction of the liquid cooling pipe 1, the required mounting size of the columnar electric core cooling device is further reduced, and the structure is more compact.

Further, as shown in fig. 9, in the present embodiment, since a plurality of supporting plates 13 are provided, a plurality of liquid cooling channels 101 are formed, and only one of the liquid cooling channels 101 is provided with an interface, and the other liquid cooling channels 101 are sealed by the cover plates provided at the two ends of the liquid cooling pipe 1, so as to further guide the flow direction of the refrigerant liquid. Of course, in order to enable the refrigerant liquid to pass through the supporting plate 13 and diffuse into different liquid cooling flow channels 101, so as to enable the refrigerant liquid to sufficiently adhere to the surface of the cylindrical battery cell 3, the supporting plate 13 is provided with a notch 131 extending along the axial direction of the liquid cooling pipe 1, and the two liquid cooling flow channels 101 located at two sides of the notch 131 can be communicated through the notch 131. The present invention is not limited to the position and shape of the notch 131, and the refrigerant fluid can flow through the notch 131.

Furthermore, the cover plate can not only seal the port of part of the liquid cooling flow channel 101, but also be installed at the two ends of the liquid cooling pipe 1 in a manner of snap connection, threaded connection, glue connection and the like after the cylindrical battery cell 3 is placed in the liquid cooling pipe 1, so that the cylindrical battery cell 3 is fixed in the liquid cooling pipe 1.

Optionally, in any of the above embodiments, as shown in fig. 4 and fig. 6, a routing through groove 14 is provided at an inner wall of the liquid cooling pipe 1, and the routing through groove 14 penetrates through the columnar cell cooling device (including the liquid cooling pipe 1 and the end cap 2, if provided) along an axial direction of the liquid cooling pipe 1. Exemplarily, in the present embodiment, as shown in fig. 6 and 8, only one sector-shaped cavity is provided in the liquid cooling tube 1, a proximal axis side of the sector-shaped cavity is a major arc, and the minor arc between two end edges forms the above-mentioned routing through groove 14, so that when assembling, circuit elements such as connection lines can be arranged through the routing through groove 14, and the operation is more convenient, and the maintenance and the overhaul are also more convenient.

The utility model also provides a battery package, this battery package includes a plurality of column electricity core 3 and foretell column electricity core cooling device, and a plurality of column electricity cores 3 are located to 1 covers of liquid cooling pipe of column electricity core cooling device, and the setting of a plurality of column electricity cores 3 of the heat transfer plate 12 laminating of the nearly axle limit department of 1 inside liquid cooling pipes, form the 3 surfaces of the 12 one sides laminating column electricity cores of heat transfer plate, the refrigeration structure of the opposite side mobile refrigerant liquid. Through adopting above-mentioned column electricity core cooling device in the battery package, further increased the cooling area of column electricity core 3, improved the radiating efficiency to retrench the inner structure of battery package, improved battery package overall structure's integrated level, the design of being more convenient for, installation, maintenance and dismantlement.

Optionally, each battery pack at least includes two of the above columnar battery cell cooling devices, each columnar battery cell cooling device is provided with one group of columnar battery cells 3, the refrigerant fluids of the two columnar battery cell cooling devices are in parallel connection, and the two groups of columnar battery cells 3 are also in parallel connection. The liquid paths of the two refrigerating liquids and the circuits of the two groups of columnar battery cores 3 are connected in parallel, so that the two columnar battery core cooling devices and the two groups of columnar battery cores 3 inside work independently respectively, the battery pack forms a multi-loop system, the fault tolerance rate is higher, the robustness is better, and the performance is more stable and safer.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Columnar battery core cooling device, its characterized in that includes:

liquid cooling pipe (1), liquid cooling pipe (1) is used for the cover to locate the surface of column electricity core (3), the inner wall department of liquid cooling pipe (1) is provided with liquid cooling chamber (10), liquid cooling chamber (10) are followed the axial direction of liquid cooling pipe (1) runs through liquid cooling pipe (1), liquid cooling chamber (10) are including sector shape cavity, the paraxial limit of sector shape cavity is used for the laminating column electricity core (3) heat transfer, the sector shape cavity can flow and be equipped with the refrigerating fluid.

2. The columnar cell cooling device according to claim 1, wherein at least two of the sector-shaped cavities are provided at the inner wall of the liquid-cooled tube (1).

3. The column-shaped cell cooling device according to claim 1, wherein side plates (11) are provided on an inner wall surface of the liquid-cooled tube (1), a heat transfer plate (12) is provided near an axial edge of the sector-shaped cavity, at least two side plates (11) are hermetically connected to the heat transfer plate (12), the sector-shaped cavity is formed between a tube wall of the liquid-cooled tube (1), the heat transfer plate (12) and at least two adjacent side plates (11), and the heat transfer plate (12) is used for being attached to the column-shaped cell (3) for heat transfer.

4. The cylindrical cell cooling device according to claim 3, wherein at least one support plate (13) is further disposed in the sector-shaped cavity, the support plate (13) extends along the axial direction of the liquid-cooled tube (1), the support plate (13) abuts against between the tube wall of the liquid-cooled tube (1) and the heat transfer plate (12), and the support plate (13) divides the sector-shaped cavity into at least two liquid-cooled flow channels (101).

5. The cooling device for cylindrical electrical cores of claim 4, wherein at least two support plates (13) are disposed in the sector-shaped cavity, and the at least two support plates (13) are uniformly arranged with the axis of the liquid cooling tube (1) as a rotation center.

6. The column cell cooling arrangement of claim 4, characterized in that at least one of the support plates (13) is provided with a slot (131), and the two liquid cooling channels (101) on both sides of the slot (131) are connected via the slot (131).

7. The cylindrical cell cooling device according to any one of claims 1 to 6, further comprising a liquid inlet joint (15) and a liquid outlet joint (16), wherein the liquid inlet joint (15) and the liquid outlet joint (16) are communicated with the liquid cooling chamber (10), the liquid inlet joint (15) is located at one end of the liquid cooling pipe (1), and the liquid outlet joint (16) is located at the other end of the liquid cooling pipe (1).

8. The columnar cell cooling device according to any one of claims 1 to 6, wherein a routing channel (14) is provided at an inner wall of the liquid-cooled tube (1), and the routing channel (14) penetrates through the columnar cell cooling device along an axial direction of the liquid-cooled tube (1).

9. The battery pack is characterized by comprising a plurality of columnar battery cores (3) and the columnar battery core cooling device in any one of claims 1 to 8, wherein the columnar battery core cooling device is sleeved on the columnar battery cores (3), and the near axial edges of the columnar battery core cooling device are attached to the columnar battery cores (3).

10. The battery pack of claim 9, comprising at least two columnar cell cooling devices, wherein each columnar cell cooling device is provided with one group of columnar cells (3), the refrigerant fluid of the two columnar cell cooling devices is in parallel connection, and the two groups of columnar cells (3) are also in parallel connection.