Battery pack cooling device

Abstract

The utility model belongs to the technical field of battery packs, and particularly relates to a battery pack cooling device. Comprising a box body and a box cover, a containing cavity is formed in the box body, and the box body and the box cover form a closed space; a module and an electric device are arranged in the accommodating cavity; a cooling unit is arranged at the bottom of the module; the cooling unit intermittently absorbs heat of the module; and the cooling unit absorbs heat when the module needs to absorb heat, and stops absorbing heat when the module does not need to absorb heat, so that the adaptability to the use working condition of the module is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery packs, and in particular relates to a battery pack cooling device. Background Art

[0002] With the increasing popularity of new energy vehicles and the increasing range and charging speed of electric vehicles, the temperature control requirements for power battery modules are also increasing. During the battery charging and discharging process, a large amount of chemical reaction heat is generated, resulting in overall or localized high temperatures. If the heat is not released in a timely manner, thermal runaway of the battery is very likely. When operating at low temperatures, lithium dendrites are prone to form inside the battery, reducing battery capacity and even causing internal short circuits. To maintain consistent battery temperature, existing technologies use natural cooling, forced air cooling, liquid cooling, phase change materials, and other methods to achieve reasonable control of battery cell temperature. Liquid cooling and liquid heating methods have good fluidity and are commonly used in battery temperature control systems. However, when the heat dissipation of the battery cell is large, the requirements for liquid cooling flow rate and piping are more stringent, and the layout of liquid cooling pipelines is complex.

[0003] Therefore, a battery pack cooling device is needed to solve the above problems. Utility Model Content

[0004] In response to the above problems, the present invention proposes a battery pack cooling device, including a box body and a box cover, wherein a accommodating cavity is opened inside the box body, and the box body and the box cover form an enclosed space; a module and an electrical component are arranged in the box body; a cooling unit is provided at the bottom of the module; and the cooling unit intermittently absorbs heat or keeps the module warm.

[0005] Furthermore, the cooling unit includes a rotating module and a cooling assembly; the cooling assembly is mounted on the rotating module; and the rotating module drives the cooling assembly to move.

[0006] Furthermore, a temperature averaging plate is provided between the module and the cooling unit, and the temperature averaging plate is in close contact with the module and the cooling unit.

[0007] Furthermore, the rotation module includes a power unit and a drive assembly; the output end of the power unit is connected to the drive assembly.

[0008] Furthermore, the cooling component includes a conveyor belt; a filling cavity is opened on the conveyor belt; and cooling material is arranged in the filling cavity.

[0009] Furthermore, the cooling material is a flexible phase change material.

[0010] Furthermore, a cavity No. 1 is provided on the conveyor belt and is symmetrically arranged with the filling cavity.

[0011] Furthermore, the inner wall of the No. 1 cavity is installed with thermal insulation material.

[0012] Furthermore, the inner wall of the No. 1 cavity is wavy.

[0013] Furthermore, a bottom guard plate is installed at the bottom of the conveyor belt; and a side of the conveyor belt away from the module is in contact with the bottom guard plate.

[0014] The utility model uses a cooling unit composed of flexible phase change materials to dissipate heat from the module when the module temperature rises and needs to absorb heat. When the module needs to be kept warm, the position of the flexible phase change material is adjusted to keep the module warm. Different strategies are given according to different working conditions of the module, thereby expanding the scope of application for different module working conditions and improving the adaptability to the module working conditions.

[0015] The utility model adopts flexible phase change material to increase latent heat; at the same time, to a certain extent, no protective material is provided between the battery cells, and the battery cells are prevented from thermal runaway by controlling the temperature only through the phase change material.

[0016] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Shown is an overall schematic diagram of the present utility model.

[0019] Figure 2 Shown is a schematic diagram of the interior of the box of the present invention.

[0020] Figure 3 A schematic diagram showing the positions of the conveyor belt and the module in the present invention is shown.

[0021] Figure 4 Shown Figure 3 An enlarged schematic diagram of the location of the conveyor belt and the temperature distribution plate.

[0022] Figure 5 Shown Figure 4 Schematic diagram of cavity number one.

[0023] In the figure, 10, box body; 101, accommodating cavity; 102, module; 103, electrical component; 104, temperature equalizing plate; 105, bottom guard plate; 20, box cover; 30, cooling unit; 301, drive assembly; 302, conveyor belt; 3021, flexible phase change material; 3022, cavity No. 1. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0025] The present invention provides a battery pack cooling device. Figure 1 , including a box body 10 and a box cover 20, the box body 10 is provided with a accommodating cavity 101 inside, and the box body 10 and the box cover 20 form a closed space; a module 102 and an electrical component 103 are arranged in the box body 10; a cooling unit 30 is provided at the bottom of the module 102; the cooling unit 30 intermittently absorbs heat or keeps the module 102 warm. When the temperature of the module 102 is too high and needs to absorb heat, the cooling unit 30 quickly dissipates the heat of the module 102; when the module 102 stops working and needs to be kept warm, the cooling unit 30 stops absorbing heat from the module 102, and can also keep warm in a low temperature environment.

[0026] The above-mentioned cooling unit 30 includes a rotating module and a cooling component; the above-mentioned cooling component is installed on the rotating module; the above-mentioned rotating module drives the cooling component to move; when absorbing heat from the module 102, the rotating module drives the cooling component to move to the bottom of the module 102, and cools and dissipates heat from the module 102 through the heat absorption performance of the cooling component; when it is not necessary to absorb heat from the module 102, the rotating module drives the cooling component away from the bottom of the module 102 and stops absorbing heat from the module 102.

[0027] refer to Figure 3 、 one In the embodiment, a temperature equalizing plate 104 is provided between the module 102 and the cooling unit 30, and the temperature equalizing plate 104 is in close contact with the module 102 and the cooling unit 30; the temperature equalizing plate 104 is installed on the module 102 so that the heat caused by the increased temperature of the module 102 can be quickly heat-conducted and heat-diffused through the temperature equalizing plate 104; when the module 102 absorbs heat, the rotating module drives the cooling component to move to the lower end of the temperature equalizing plate 104, and the cooling component is in contact with the temperature equalizing plate 104, and the module 102 is dissipated through the temperature equalizing plate 104, thereby further improving the heat dissipation effect of the module 102.

[0028] In one embodiment, the temperature averaging plate 104 is an aluminum plate, and the temperature averaging plate 104 and the box body 10 are welded and integrated into one.

[0029] In one embodiment, the temperature averaging plate 104 is an aluminum plate, and the temperature averaging plate 104 is detachably connected to the box body 10 by bolts.

[0030] In one embodiment, referring to Figure 4 , the rotation module includes a power unit and a driving assembly 301; the output end of the power unit is connected to the driving assembly;

[0031] The cooling component includes a conveyor belt 302; a filling cavity is provided on the conveyor belt 302; a cooling material is provided in the filling cavity. The filling cavity inside the conveyor belt 302 is filled with cooling material; the cooling material can absorb heat and keep warm through the conveyor belt 302; the driving component 301 directly drives the conveyor belt 302 to move, and drives the cooling material to move to the module 102 position through the conveyor belt 302 to absorb heat from the module 102; the power unit can be an electric motor, and the driving component 301 can be a roller, and the roller is located at both ends of the conveyor belt 302; when the motor starts, it drives the conveyor belt 302 to move at a constant speed through the roller, and when the cooling material in the conveyor belt 302 moves to the upper end, the adjustment of the working state of the cooling component is completed; when the conveyor belt 302 makes a complete rotation, the cooling material passes from the lower end to the upper end and then to the lower end, completing a complete cycle of intermittent heat absorption process for the module 102.

[0032] The cooling material mentioned above is flexible phase change material 3021, a high-performance functional composite material prepared using a melt blending method using PA as a filler and PDMS as a matrix. Phase change materials, with their low mass, low thermal resistance, and high latent heat, hold great potential in the field of battery thermal management. While most fixed phase change materials are rigid, they struggle to meet the flexibility requirements of battery thermal management applications. Compared to traditional rigid phase change materials, flexible materials can withstand deformations such as bending, stretching, and torsion, and can better conform to target objects. Since PDMS is formed by polymerization, PA molecules can be evenly dispersed in the polymer network of PDMS. Flexible composite materials containing 30% PA can withstand a large degree of deformation, such as stretching, bending and twisting; at the same time, as the PA content increases, the latent heat value of the composite material increases, the thermal management ability is enhanced, the tensile fracture strain is reduced, and the mechanical strength is improved; thereby, it can better fit with the module 102 and produce a better heat absorption effect for the module 102; the driving component 301 directly drives the flexible phase change material 3021 to move, so that the flexible phase change material 3021 absorbs heat from the module 102.

[0033] In one embodiment, the flexible phase change material 3021 is used as the cooling material placed in the filling cavity by the conveyor belt 302. Figure 4 The filling cavity can be an open setting, and the flexible phase change material 3021 is placed in the filling cavity. The flexible phase change material 3021 is fixed by setting a limit plate or the like, so that the flexible phase change material 3021 can directly contact the module 102 when absorbing heat, thereby further improving the heat absorption effect. The filling cavity can also be a closed setting (such as Figure 5 ), the flexible phase change material 3021 is placed inside to ensure that the driving component 301 drives the flexible phase change material 3021 to move more stably.

[0034] refer to Figure 5 The conveyor belt 302 is provided with a cavity No. 1 3022 which is symmetrical to the filling cavity; when the module 102 stops working and needs to be kept warm, the driving component 301 drives the conveyor belt 302 to rotate, so that the side of the conveyor belt 302 with the cavity No. 1 3022 moves to the position of the module 102, and the cavity No. 1 3022 on one side of the conveyor belt 302 is in contact with the temperature equalizing plate 104, stopping the heat absorption and heat dissipation of the module 102, and keeping the module 102 warm in a cold environment, and the external flexible phase change material 3021 can prevent fluctuations in the external environment.

[0035] The inner wall of the first cavity 3022 is installed with insulation material. The first cavity 3022 improves the thermal resistance, which is more conducive to heat preservation of the module 102. The opening of the first cavity 3022 further increases the air thermal resistance and heat preservation. At the same time, the installation of insulation material in the first cavity 3022 further improves the heat preservation effect of the module 102.

[0036] The inner wall of the first cavity 3022 is wavy, which can increase the contact area between the first cavity 3022 and the insulation material, thereby further improving the insulation effect of the module 102 in a cold environment.

[0037] In one embodiment, a bottom guard plate 105 is installed at the bottom of the conveyor belt 302; the side of the conveyor belt 302 away from the module 102 is in contact with the bottom guard plate 105; when the module 102 is kept warm, the side of the conveyor belt 302 with the first cavity 3022 is Figure 5 The upper side of the flexible phase change material 3021 is in contact with the temperature plate 104. Figure 5The lower side of the module 102 is fitted with the bottom guard plate 105; and the cooling material in the cooling assembly is fitted with the bottom guard plate 105 to dissipate heat from the cooling material, and the No. 1 cavity 3022 is fitted with the module 102 to insulate the module 102 and reduce the impact of external heat; on the one hand, the air thermal resistance is increased by the No. 1 cavity 3022, and on the other hand, the flexible phase change material 3021 can reduce the fluctuation of the ambient temperature, thereby further improving the effect of insulating the module 102.

[0038] The present invention uses a cooling unit 30 composed of a flexible phase change material 3021 to dissipate heat from the module 102 when the temperature of the module 102 rises and needs to absorb heat. When the module 102 needs to be kept warm, the position of the flexible phase change material 3021 is adjusted to keep the module 102 warm. Different measurements are given according to different operating conditions of the module 102, thereby expanding the scope of application for different operating conditions of the module 102.

[0039] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A battery pack cooling device, characterized in that: The invention comprises a box body (10) and a box cover (20); a receiving cavity (101) is provided inside the box body (10); the box body (10) and the box cover (20) form a closed space; a module (102) and an electrical device (103) are arranged inside the box body (10); a cooling unit (30) is provided at the bottom of the module (102); and the cooling unit (30) intermittently absorbs heat or keeps the module (102) warm.

2. The battery pack cooling device according to claim 1, characterized in that: The cooling unit (30) comprises a rotating module and a cooling assembly; the cooling assembly is mounted on the rotating module; and the rotating module drives the cooling assembly to move.

3. The battery pack cooling device according to claim 2, characterized in that: A temperature equalizing plate (104) is provided between the module (102) and the cooling unit (30), and the temperature equalizing plate (104) is in close contact with the module (102) and the cooling unit (30).

4. The battery pack cooling device according to claim 3, characterized in that: The rotation module comprises a power unit and a driving assembly (301); the output end of the power unit is connected to the driving assembly.

5. The battery pack cooling device according to claim 4, characterized in that: The cooling component comprises a conveyor belt (302); a filling cavity is provided on the conveyor belt (302); and cooling material is provided in the filling cavity.

6. The battery pack cooling device according to claim 5, characterized in that: The cooling material is a flexible phase change material (3021).

7. The battery pack cooling device according to claim 6, characterized in that: The conveyor belt (302) is provided with a first cavity (3022) symmetrically arranged with the filling cavity.

8. The battery pack cooling device according to claim 7, characterized in that: The inner wall of the first cavity (3022) is installed with thermal insulation material.

9. The battery pack cooling device according to claim 8, characterized in that: The inner wall of the first cavity (3022) is wavy.

10. The battery pack cooling device according to claim 5, characterized in that: A bottom guard plate (105) is installed at the bottom of the conveyor belt (302); the side of the conveyor belt (302) away from the module (102) is in contact with the bottom guard plate (105).

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