CN217086704U

CN217086704U - Heat radiation structure and battery module

Info

Publication number: CN217086704U
Application number: CN202220699272.5U
Authority: CN
Inventors: 单雪燕
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-07-29
Anticipated expiration: 2032-03-28

Abstract

The utility model discloses a heat dissipation structure and a battery module. The heat dissipation structure is used to dissipate heat for a cylindrical battery. The heat dissipation structure comprises a casing and a plurality of heat conducting parts. The casing comprises a cylindrical side wall, a top cover and a bottom cover. The top cover and the bottom cover respectively have circular holes, the top cover and the bottom cover are respectively connected to the top and bottom of the cylindrical side wall, and the inner wall of the circular hole of the top cover and the inner wall of the circular hole of the bottom cover are axially arranged. Alignment, the plurality of heat conducting members extend radially inward from the cylindrical side wall to a predetermined position, the predetermined position is located on the same cylindrical surface and is aligned with the inner walls of the circular holes of the top cover and the bottom cover. The heat dissipation structure of the utility model can be adapted to the cylindrical battery, the circular holes of the top cover and the bottom cover can connect the top and bottom of the cylindrical battery, and a plurality of heat conducting parts can abut against the outer circumference of the cylindrical battery. The heat generated during the operation of the cylindrical battery can be transmitted to the outside of the casing through the heat conducting member, and dissipated through the casing to prevent heat accumulation and avoid thermal runaway of the cylindrical battery.

Description

Heat radiation structure and battery module

Technical Field

The utility model relates to a lithium cell field of making, concretely relates to heat radiation structure and battery module.

Background

As one of the most core components of new energy vehicles, lithium ions have the advantages of high energy density, long cycle life, high rated voltage and power, safety, environmental protection, low self-discharge efficiency, and the like, and have been widely applied to new energy vehicles such as pure electric vehicles and hybrid electric vehicles, and lithium batteries gradually become the mainstream direction of the electric era.

Lithium ion batteries are morphologically divided into hard shell batteries, soft pack batteries and cylindrical batteries, wherein the cylindrical batteries have the advantages of high volume energy density, simple structure, easy grouping, convenience in standardization and the like.

However, with the increase of the number of new energy vehicles, the safety problem brought by the new energy vehicles is gradually shown, and the thermal runaway problem of the lithium ion battery is that lithium dendrites are gradually formed on the negative electrode of the lithium ion battery in the long-term use process. When lithium dendrites penetrate the separator and come into direct contact with the positive electrode, internal short circuits are formed to self-discharge, resulting in a large heat release of the battery. Furthermore, when one cell runs away, the lithium dendrites provide a current return path for the other cells in parallel, which corresponds to short circuiting them. Thus, thermal runaway of one cell due to lithium dendrites may propagate to other cells in parallel with it, resulting in extensive thermal runaway throughout the entire parallel stack. This extensive thermal runaway may also induce thermal runaway in adjacent battery packs because of the large amount of heat released, and thus the entire battery pack may be thermally runaway collectively, which may cause fire explosion in severe cases. Therefore, it is necessary to develop an effective means for blocking the thermal runaway mechanism.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a heat radiation structure and battery module to solve the problem that exists among the above-mentioned prior art.

In order to solve the above problem, according to the utility model discloses an aspect provides a heat radiation structure, heat radiation structure is used for dispelling the heat for the cylinder battery, include:

the shell comprises a cylindrical side wall, a top cover and a bottom cover, wherein the top cover and the bottom cover are respectively provided with a circular hole and are respectively connected with the top and the bottom of the cylindrical side wall, and the inner wall of the circular hole of the top cover and the inner wall of the circular hole of the bottom cover are axially aligned;

the heat conducting pieces extend inwards from the cylindrical side wall to preset positions, and the preset positions are located on the same cylindrical surface and are aligned with the inner wall of the circular hole along the axis.

In one embodiment, the heat-conducting member is plate-shaped and extends in the axial direction.

In one embodiment, the thermal conductor extends from the top to the bottom of the cylindrical sidewall.

In one embodiment, a plurality of heat-conducting members are arranged at intervals along the circumferential direction of the cylindrical side wall.

In one embodiment, the cylindrical side wall has a circular cross section in the radial direction, and the plurality of heat-conducting members are arranged at regular intervals in the circumferential direction of the cylindrical side wall.

In one embodiment, the heat conducting device further comprises a cylindrical inner wall, wherein the cylindrical inner wall is positioned in the cylindrical side wall, the top of the cylindrical inner wall is connected with the inner wall of the circular hole of the top cover, the bottom of the cylindrical inner wall is connected with the inner wall of the circular hole of the bottom cover, and a plurality of heat conducting pieces are connected to the cylindrical inner wall.

In one embodiment, the heat-conducting members are connected to the cylindrical inner wall, and a plurality of the heat-conducting members are arranged at equal intervals along the circumference of the cylindrical inner wall.

In one embodiment, the phase change material is located between the cylindrical sidewall and the cylindrical inner wall.

The utility model discloses still relate to a battery module, include:

a housing;

in the heat dissipation mechanism, a plurality of heat dissipation mechanisms are mounted in the housing;

a plurality of cylindrical batteries installed in the plurality of cylindrical side walls, respectively, and a plurality of the heat-conducting members extend to the outer peripheral surfaces of the cylindrical batteries.

In one embodiment, the cylindrical sidewall is a cylinder, and a ratio of a diameter of the cylindrical sidewall to a diameter of the cylindrical battery is less than 1.1.

The utility model discloses a heat radiation structure can be the cylinder battery heat dissipation, and heat radiation structure has set up heat-conducting piece and phase change material, can be fast for the cylinder battery heat dissipation, guarantees the security performance of battery module.

Drawings

Fig. 1 is a schematic view of a heat dissipation structure according to an embodiment of the present invention.

Fig. 2 is a radial sectional view of the heat dissipation structure of the embodiment shown in fig. 1.

Reference numerals: 100. a heat dissipation structure; 1. a housing; 11. a cylindrical side wall; 12. a top cover; 13. a bottom cover; 14. a heat conductive member; 15. a cylindrical channel; 16. a cylindrical inner wall.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation.

The utility model relates to a heat radiation structure 100, this heat radiation structure 100 are used for the cylinder battery heat dissipation, and this heat radiation structure 100 includes casing 1 and a plurality of heat-conducting piece 14, and the cylinder battery can be installed to casing 1, and a plurality of heat-conducting piece 14 can be used to the heat that the conduction cylinder battery gived off. Specifically, the case 1 includes a cylindrical side wall, a top cover 12 and a bottom cover 13, the top cover 12 and the bottom cover 13 having circular holes, respectively, the top cover 12 being connected to the top of the cylindrical side wall 11, and the bottom cover 13 being connected to the bottom of the cylindrical side wall 11, and the inner walls of the circular holes of the top cover 12 and the inner walls of the circular holes of the bottom cover 13 being axially aligned, the inner walls of the circular holes of the top cover 12 and the bottom cover 13 being used for connecting the top and bottom of the cylindrical battery. A plurality of heat-conducting members 14 extend radially inward from the cylindrical side wall to a predetermined position on the same cylindrical surface and aligned with the circular-hole inner walls of the top cover 12 and the bottom cover 13, and the top cover 12 and the bottom cover 13 and the plurality of heat-conducting members 14 surround the inside of the case 1 into a cylindrical passage 15 for mounting the cylindrical battery. The utility model discloses a heat radiation structure 100 is adaptable to the cylinder battery, the cylinder battery of the 15 mountable of cylinder passageway in the casing 1, and the top and the bottom of cylinder battery are connected to the circular port of top cap 12 and bottom 13, and a plurality of heat-conducting members 14 can support the periphery that leans on the cylinder battery. The heat that the cylinder battery produced in the operation can be transmitted to the casing 1 outside through heat-conducting member 14 to dispel the heat through casing 1, prevent the heat accumulation, avoid cylinder battery thermal runaway.

Alternatively, as shown in fig. 1, the heat conductive member 14 is plate-shaped and extends in the axial direction. The heat conducting member 14 extends along the length direction of the cylindrical battery, and it should be understood that a person skilled in the art may also extend the heat conducting member 14 along other directions, for example, the plurality of heat conducting members 14 may be designed into a spiral shape and sleeved on the cylindrical battery, the plurality of heat conducting members 14 may be arranged around the periphery of the cylindrical battery along the axial direction at intervals, or the heat conducting members 14 may be arranged into an integrally formed spiral structure, and the shape of the heat conducting member 14 is not limited herein.

Further, the heat-conducting member 14 extends from the top to the bottom of the cylindrical side wall 11, as shown in fig. 1, the top of the heat-conducting member 14 is connected to the top cap 12, the bottom is connected to the bottom cap 13, the outer side in the radial direction is connected to the case 1, the inner side can be connected to the cylindrical battery, and the heat-conducting member can extend from the top to the bottom of the cylindrical battery, which can increase the heat-conducting effect of the heat-conducting member 14.

Alternatively, the plurality of heat conductive members 14 are arranged at intervals along the circumferential direction of the cylindrical side wall 11. In the embodiment of fig. 1 and 2, a plurality of plate-shaped heat conducting members 14 may be arranged at intervals along the circumferential direction of the cylindrical battery to form a fin-shaped heat dissipation structure 100, so as to increase the heat dissipation area and achieve better effect. It should be understood that a person skilled in the art may also arrange the plurality of plate-shaped heat-conducting members 14 at intervals along the axial direction of the cylindrical battery, or at intervals inclined at a certain angle along the axial direction, and the arrangement of the plurality of heat-conducting members 14 is not limited. In another embodiment, the heat conducting member 14 may be designed to have the same shape as the top cover 12 or the bottom cover 13, that is, a circular hole is also formed on the heat conducting member 14, the plurality of heat conducting members 14 are arranged at intervals along the circumferential direction, and the circular holes of the plurality of heat conducting members 14 are aligned with the circular holes of the top cover 12 and the bottom cover 13, the circular holes of the plurality of heat conducting members 14 and the circular holes of the top cover 12 and the bottom cover 13 are arranged to form a cylindrical channel 15, a cylindrical battery may be mounted, the outer periphery of the cylindrical battery may contact the inner wall of the circular hole of the plurality of heat conducting members 14, and heat generated by the cylindrical battery may also be dissipated through the plurality of heat conducting members 14. In addition, the number of the heat-conducting members 14 and the distance between the plurality of heat-conducting members 14 may be determined according to the size of the cylindrical battery, and the number of the plurality of heat-conducting members 14 or the interval between the plurality of heat-conducting members 14 is not limited herein.

Alternatively, as shown in fig. 1 and 2, the radial section of the cylindrical side wall 11 is circular, and the plurality of heat conduction members 14 are arranged at regular intervals along the circumferential direction of the cylindrical side wall 11, so that the cylindrical battery can uniformly dissipate heat, and heat is prevented from being concentrated at a certain position, thereby causing thermal runaway of the cylindrical battery. The cylindrical side wall 11 can be designed as a rectangular barrel by those skilled in the art, and the shape of the cylindrical side wall 11 is not limited.

Optionally, the heat dissipation structure 100 further includes a cylindrical inner wall 16, the cylindrical inner wall 16 is located in the cylindrical side wall 11, the top of the cylindrical inner wall 16 is connected to the inner wall of the circular hole of the top cover 12, the bottom of the cylindrical inner wall is connected to the inner wall of the circular hole of the bottom cover 13, and the cylindrical inner wall 16 facilitates installation of the cylindrical battery, so that the cylindrical battery can be installed in the heat dissipation structure 100 more quickly. It should be understood that the cylindrical inner wall 16 and the heat conducting member 14 are made of a metal material with good heat conductivity, including but not limited to copper. The cylindrical inner wall 16 may contact the cylindrical battery and may transfer heat dissipated from the cylindrical battery to the heat conducting member 14, and then dissipate the heat through the heat conducting member 14.

Alternatively, the heat-conducting members 14 are connected to the cylindrical inner wall 16, and the plurality of heat-conducting members 14 are arranged at equal intervals in the circumferential direction of the cylindrical inner wall 16. As shown in fig. 1 and 2, the plurality of heat conducting members 14 are connected to the cylindrical inner wall 16, or may be integrally formed with the cylindrical inner wall 16, and the cylindrical inner wall 16 may contact the periphery of the cylindrical battery, i.e., may receive all heat radiated from the periphery of the cylindrical battery, and then radiate the heat through the heat conducting members 14.

Optionally, the heat dissipating structure 100 further comprises a phase change material between the cylindrical sidewall 11 and the cylindrical inner wall 16, the phase change material being filled between the plurality of heat conducting members 14. The phase-change material has a heat absorption function and can quickly absorb heat emitted by the cylindrical battery. Additionally, the utility model discloses a phase change material is the material of heat absorption function, include but not be restricted to polyethylene glycol or epoxy, can add single phase change material to between a plurality of heat-conducting pieces 14, also can mix a plurality of phase change materials and fill to between a plurality of heat-conducting pieces 14.

The utility model discloses still relate to a battery module, this battery module includes shell, a plurality of cylinder battery and a plurality of foretell heat radiation structure 100. Specifically, the housing is used to mount a plurality of cylindrical batteries and a plurality of heat dissipation structures 100, the plurality of cylindrical batteries may be respectively mounted in the plurality of cylindrical side walls 11, and then the plurality of heat dissipation structures 100 and the cylindrical batteries are mounted in the housing 1 side by side.

In addition, the cylindrical battery is installed in the cylindrical sidewall 11, the outer surface of the cylindrical battery contacts the plurality of heat conducting members 14 or the cylindrical inner wall 16, and the cylindrical sidewall 11 may be filled with a phase change material or other heat absorbing material, or other cooling liquid.

Optionally, the tube-shape lateral wall 11 is a cylinder, and the diameter ratio of the diameter of the tube-shape lateral wall 11 to the diameter of the cylindrical battery is smaller than 1.1, in order to reduce the volume of the battery module, the size of the tube-shape lateral wall 11 is not too large easily, the diameter of the tube-shape lateral wall 11 and the diameter of the cylindrical battery are smaller than 1.1, on one hand, the tube-shape lateral wall 11 can have enough accommodating space to fill sufficient phase-change materials or cooling liquid, it is ensured that the cylindrical battery can dissipate heat quickly, on the other hand, too much space in the battery module cannot be occupied, and the energy density of the battery module cannot be affected.

The utility model discloses a heat radiation structure 100 can be the cylinder battery heat dissipation, and heat radiation structure 100 has set up heat-conducting piece 14 and phase change material, can be fast for the cylinder battery heat dissipation, guarantees the security performance of battery module.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. A heat dissipation structure for dissipating heat for a cylindrical battery, comprising:

2. The heat dissipating structure of claim 1, wherein the heat conducting member is plate-shaped and extends in an axial direction.

3. The heat dissipating structure of claim 2, wherein the heat conducting member extends from a top to a bottom of the cylindrical sidewall.

4. The heat dissipating structure of claim 2, wherein a plurality of heat conducting members are arranged at intervals in a circumferential direction of the cylindrical side wall.

5. The heat dissipating structure of claim 2, wherein the cylindrical sidewall has a circular cross section in a radial direction, and the plurality of heat conductive members are arranged at regular intervals in a circumferential direction of the cylindrical sidewall.

6. The heat dissipating structure of claim 2, further comprising a cylindrical inner wall, wherein the cylindrical inner wall is located inside the cylindrical side wall, and wherein a top portion of the cylindrical inner wall is connected to the inner wall of the circular hole of the top cover, a bottom portion of the cylindrical inner wall is connected to the inner wall of the circular hole of the bottom cover, and a plurality of heat conducting members are connected to the cylindrical inner wall.

7. The heat dissipating structure of claim 6, wherein the heat conducting member is connected to the cylindrical inner wall, and a plurality of the heat conducting members are arranged at regular intervals along the circumference of the cylindrical inner wall.

8. The heat dissipating structure of claim 7, further comprising a phase change material located between the cylindrical sidewall and the cylindrical inner wall.

9. A battery module, comprising:

a housing;

a plurality of the heat dissipating structures of any of claims 1-8, a plurality of the heat dissipating structures being mounted within the housing;

10. The battery module according to claim 9, wherein the cylindrical sidewall is a cylinder, and a ratio of a diameter of the cylindrical sidewall to a diameter of the cylindrical battery is less than 1.1.