Heat conduction pipe embedded snakelike phase change material battery heat management device

Abstract

The utility model discloses a heat conduction pipe embedded snakelike phase change material battery heat management device which comprises a base, a cylindrical battery cell and a snakelike phase change material plate, a plurality of cylindrical battery cells are arranged on the base; the plurality of cylindrical battery cells are arranged in an array; the plurality of snakelike phase change material plates are respectively attached to and abutted against the plurality of cylindrical battery cells, and heat conduction pipes are buried in the plurality of snakelike phase change material plates; the heat conduction pipe extends in the length direction of the snakelike phase change material plate, and a liquid inlet and a liquid outlet of the heat conduction pipe are both exposed out of the snakelike phase change material plate. After the scheme is adopted, passive heat dissipation can be realized by utilizing the snakelike phase change material plate, active heat dissipation can be realized by utilizing a low-temperature medium pumped into the heat conduction pipe, and temperature rise can be realized by utilizing a high-temperature medium pumped into the heat conduction pipe, so that the use requirements under various working conditions are met.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal management, and in particular to a heat pipe embedded serpentine phase change material battery thermal management device. Background Art

[0002] Since the 21st century, energy crises and environmental issues have become increasingly severe. Promoting the use of clean energy electric vehicles can effectively alleviate the enormous pressures brought about by the oil crisis and environmental degradation. To this end, governments worldwide have set timetables for banning the sale of fuel-powered vehicles to promote the development and promotion of electric vehicles. As a core component of electric vehicles, the power performance of electric vehicle power batteries plays a decisive role in the overall performance of the vehicle. However, power battery performance fluctuates with operating temperature: research shows that the operating temperature of battery cells should be below 50°C, and the temperature difference across the cell surface should be less than 5°C. Excessively high operating temperatures and large temperature differences can cause irreversible damage to battery capacity and lifespan. Furthermore, if the heat generated by high-power electric vehicle power batteries cannot be dissipated quickly, it will quickly accumulate within the battery, inevitably causing internal temperature increases, further triggering a series of violent chemical reactions, and ultimately leading to safety issues such as smoke and combustion. Therefore, enhancing heat dissipation within electric vehicle battery cells is crucial for the safety and performance of electric vehicles. Battery thermal management systems are essential components for ensuring the safe operation of electric vehicles.

[0003] In traditional battery thermal management systems, liquid cooling technology offers high temperature control efficiency and wide applicability. However, this technology faces challenges such as complex piping layouts and heat transfer medium leakage, which can lead to battery pack short circuits. Phase change material cooling technology eliminates the risk of battery pack short circuits caused by leakage. However, as a passive cooling technology, phase change cooling clearly cannot meet the heat dissipation and insulation requirements of batteries in extremely cold and hot conditions. These shortcomings hinder the industrialization and promotion of battery cooling technology in battery modules. Utility Model Content

[0004] The purpose of the utility model is to provide a heat pipe embedded serpentine phase change material battery thermal management device to solve the shortcomings of existing liquid cooling and phase change material heat dissipation.

[0005] In order to solve the above technical problems, the utility model provides a heat pipe embedded serpentine phase change material battery thermal management device, including a base, a cylindrical battery cell and a serpentine phase change material plate; a plurality of the cylindrical battery cells are provided on the base; the plurality of the cylindrical battery cells are arranged in an array; a plurality of the serpentine phase change material plates are respectively fitted and abutted against the plurality of the cylindrical battery cells, and a heat pipe is buried inside the plurality of the serpentine phase change material plates; the heat pipe extends along the length direction of the serpentine phase change material plate, and the liquid inlet and outlet of the heat pipe are both exposed outside the serpentine phase change material plate.

[0006] In one embodiment, a plurality of battery cell placement grooves are provided on the base, and a plurality of the cylindrical battery cells are respectively installed in the plurality of battery cell placement grooves.

[0007] In one embodiment, a plurality of serpentine grooves are provided on the base, and a plurality of serpentine phase change material plates are respectively installed in the plurality of serpentine grooves.

[0008] In one embodiment, thermal conductive glue is provided at the joints between the serpentine phase change material plate and the cylindrical battery core.

[0009] In one embodiment, the thermal conductive adhesive is organic thermal conductive adhesive, thermal conductive mud, thermal conductive silicone pad or silicone thermal conductive adhesive.

[0010] In one embodiment, the heat pipe is made of metal, thermally conductive ceramic or plastic.

[0011] In one embodiment, the serpentine phase change material plate is an insulating serpentine phase change material plate.

[0012] In one embodiment, the serpentine phase change material plate is a flame retardant serpentine phase change material plate.

[0013] The serpentine phase change material plate described in the present invention is a modified fixed phase change material that can undergo a physical state change within a certain temperature range; when the temperature is higher than this temperature range, the microscopic physical state of the phase change material changes from solid to liquid, absorbing a large amount of heat; when the temperature is lower than this temperature range, the microscopic physical state of the phase change material changes from liquid to solid, releasing a large amount of heat, but the phase change material still maintains a stable shape on a macroscopic level and does not collapse or leak.

[0014] Under mild operating conditions, the temperature of the cylindrical battery cells can be firmly locked within a safe operating temperature range by utilizing the phase change material's ability to absorb and release heat during its physical state transition. Phase change materials with different phase change temperatures can also be selected based on the specific needs of the equipment. When encountering extreme hot or cold operating conditions, that is, when the ambient temperature is significantly higher or lower than the phase change temperature of the phase change material, for example, when the ambient temperature is significantly higher than the phase change temperature of the phase change material, active secondary heat dissipation of the cylindrical battery cells can be achieved by pumping coolant through the heat pipes. When the temperature is significantly lower than the phase change temperature of the phase change material, active heating of the cylindrical battery cells can be achieved by pumping hot heat transfer medium through the heat pipes. During the active heating or heat dissipation of the cylindrical battery cells, the serpentine phase change material plate can act as a temperature buffer, significantly reducing the temperature difference during this process.

[0015] Therefore, compared with the prior art, the present invention has at least the following benefits:

[0016] 1. Energy saving: Under mild working conditions, the temperature control and uniform temperature of the cylindrical battery cells can be achieved by relying solely on the serpentine phase change material plate. The heat pipe can achieve efficient thermal management of the cylindrical battery cells without the need for all-weather operation, which can effectively save energy and indirectly increase the energy density of the cylindrical battery cells.

[0017] 2. Short-circuit prevention: Heat pipes are subject to the risk of rupture and leakage over time. Leaked electrolyte can cause short circuits and fires in cylindrical cells. The embedded heat pipe layout prevents leakage of conductive electrolyte and the resulting fires, explosions, and other major safety hazards.

[0018] 3. Temperature equalization: Non-embedded heat pipes directly contact the cylindrical cells, causing the temperature near the heat pipes to be significantly higher or lower than that farther away. This creates a large temperature gradient, accelerating the failure of the cylindrical cells. During the active heating or cooling process of the cylindrical cells, the phase change effect of the serpentine phase change material plate acts as a temperature buffer, significantly reducing the temperature difference during this process and thus extending the service life of the cylindrical cells.

[0019] In summary, the utility model has good durability and high safety, and does not have major safety hazards such as coolant leakage and battery pack short circuit. It can be applied to electric vehicles and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural diagram provided by an embodiment of the present utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the base structure;

[0023] Figure 3 yes Figure 1 Schematic diagram of the cylindrical battery cell and thermal rod structure.

[0024] The reference numerals are as follows:

[0025] 10. Base; 11. Battery cell placement groove; 12. Serpentine groove;

[0026] 20. Cylindrical battery cells;

[0027] 30. Serpentine phase change material plate;

[0028] 40. Heat pipe. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] The utility model provides a heat pipe embedded serpentine phase change material battery thermal management device, which is implemented as follows: Figure 1 As shown, it includes a base 10, a cylindrical battery core 20 and a serpentine phase change material plate 30.

[0031] Regarding the base 10, its function is to provide support and installation space for the remaining components, so there are no special design requirements for its shape; for example, in this embodiment, the base 10 is a rectangular plate structure, and the base 10 is provided with not only a plurality of cylindrical battery cells 20 but also a plurality of serpentine phase change material plates 30, thereby realizing the installation and fixation of the plurality of cylindrical battery cells 20 and the plurality of serpentine phase change material plates 30.

[0032] Specifically, in order to achieve the installation and fixation of multiple cylindrical battery cells 20, as shown in FIG. Figure 1 and Figure 2 As shown, this embodiment is provided with a plurality of battery cell placement grooves 11 on the base 10, and a plurality of cylindrical battery cells 20 are respectively installed in the plurality of battery cell placement grooves 11, thereby achieving a stable installation of the plurality of cylindrical battery cells 20; for example, the cylindrical battery cells 20 of this embodiment are cylindrical, so this embodiment designs the battery cell placement grooves 11 as circular hole-shaped grooves, so that the cylindrical battery cells 20 can be embedded in the battery cell placement grooves 11 in a manner matching the shape and size, thereby ensuring the stable installation of the cylindrical battery cells 20; therefore, when the cylindrical battery cells 20 adopt other different shapes, it is only necessary to design the battery cell placement grooves 11 accordingly for assembly.

[0033] Similarly, in order to realize the installation and fixation of multiple serpentine phase change material plates 30, as shown in FIG. Figure 1 and Figure 2 As shown, in this embodiment, a plurality of serpentine grooves 12 are provided on the base 10 . By installing a plurality of serpentine phase change material plates 30 in the plurality of serpentine grooves 12 respectively, a stable installation of the plurality of serpentine phase change material plates 30 can be achieved.

[0034] For example, the serpentine phase change material plate 30 of this embodiment is a continuous S-shaped structure, so this embodiment designs the serpentine groove 12 as a continuous S-shaped groove, so that the serpentine phase change material plate 30 can be embedded in the serpentine groove 12 in a shape and size matching manner, thereby ensuring the installation stability of the serpentine phase change material plate 30; therefore, when the serpentine phase change material plate 30 adopts other different shapes, it is only necessary to design the serpentine groove 12 into a corresponding shape for assembly.

[0035] Regarding the cylindrical battery cells 20, there is no unique arrangement method, but they should generally be arranged in a regular manner to facilitate production and improve space utilization. For example, in this embodiment, multiple cylindrical battery cells 20 are arranged in an array, as shown in FIG. Figure 1 As shown, at this time, the multiple cylindrical battery cells 20 are arranged along two mutually perpendicular straight lines, that is, the multiple cylindrical battery cells 20 are separated from each other and arranged in a straight line direction to form a battery group, and the multiple battery groups are separated from each other and arranged in another straight line direction, so that the multiple cylindrical battery cells 20 are arranged in a matrix; and between adjacent battery groups, the cylindrical battery cells 20 are arranged in a staggered manner, so that the cylindrical battery cells 20 in one battery group can be exactly aligned with the area where two adjacent cylindrical battery cells 20 of the adjacent battery group are separated.

[0036] Regarding the serpentine phase change material plate 30, it is a plate structure made of phase change material and is the key core for efficient heat transfer. The phase change material used can be an organic phase change material such as polyethylene glycol, aliphatic hydrocarbons and their derivatives, or an inorganic material such as molten metal, hydrated salt, or the newly developed solid-solid phase change material and flexible phase change material at this stage.

[0037] In addition, in order to improve the heat transfer efficiency of the serpentine phase change material plate 30, thermal conductive fillers such as expanded graphite and graphene can be stirred and added during the melting process of the serpentine phase change material plate 30; and in order to improve the electrical insulation performance of the serpentine phase change material plate 30, insulating fillers such as silicon carbide, boron nitride, and aluminum nitride can be stirred into the serpentine phase change material plate 30 during the preparation process of the serpentine phase change material plate 30, so that the serpentine phase change material plate 30 becomes an insulating serpentine phase change material plate 30; and in order to improve the flame retardant performance of the serpentine phase change material plate 30, insulating fillers such as aluminum oxide, melamine and sodium tripolyphosphate can be stirred into the serpentine phase change material plate 30, so that the serpentine phase change material plate 30 becomes a flame retardant serpentine phase change material plate 30.

[0038] In order to achieve good heat conduction between the serpentine phase change material plate 30 and the cylindrical battery core 20, this embodiment adopts Figure 1 and Figure 3 In the arrangement shown, the plurality of serpentine phase change material plates 30 are respectively attached to and abutted against the plurality of cylindrical battery cells 20 , and heat pipes 40 are buried inside the plurality of serpentine phase change material plates 30 .

[0039] Specifically, since the serpentine phase change material plate 30 is a continuous S-shaped structure, a plurality of separately arranged recesses are formed on both surfaces of the serpentine phase change material plate 30. At this time, it is only necessary to design the shape and size of each recess to match the shape and size of the cylindrical battery cell 20, and then embed each cylindrical battery cell 20 into each recess on the two surfaces of the serpentine phase change material plate 30 respectively. This allows the serpentine phase change material plate 30 to be tightly wrapped around the outside of the cylindrical battery cell 20. This setting method can not only speed up the heat transfer efficiency between the two, but also utilize the serpentine phase change material plate 30 to better fix the installation of the cylindrical battery cell 20.

[0040] Among them, in order to make the contact between the serpentine phase change material plate 30 and the cylindrical battery cell 20 more comprehensive and sufficient, this embodiment also provides thermal conductive glue at the contact points between the serpentine phase change material plate 30 and the cylindrical battery cell 20, so as to use the thermal conductive glue to fill the various pores existing at the contact points between the serpentine phase change material plate 30 and the cylindrical battery cell 20, thereby preventing the occurrence of insufficient contact that affects heat conduction.

[0041] The choice of the above-mentioned thermal conductive adhesive is not exclusive. For example, the thermal conductive adhesive in this embodiment is organic thermal conductive adhesive. However, according to actual needs, technicians can set the thermal conductive adhesive to be organic thermal conductive adhesive, or to be thermal conductive mud, thermal conductive silicone pad or silicone thermal conductive adhesive.

[0042] The above-mentioned heat pipe 40 is buried in the serpentine phase change material plate 30, so the buried position of the heat pipe 40 will affect the heat transfer effect at various locations of the serpentine phase change material plate 30; therefore, in order to ensure that the heat pipe 40 can perform a good heat transfer function at various locations of the serpentine phase change material plate 30, this embodiment arranges the heat pipe 40 to extend along the length direction of the serpentine phase change material plate 30, thereby ensuring that the effective range of the heat pipe 40 can span the entire serpentine phase change material plate 30, and the liquid inlet and outlet of the heat pipe 40 are both exposed outside the serpentine phase change material plate 30, which also facilitates controlling the pumped medium entering and flowing out of the heat pipe 40.

[0043] Among them, in order to ensure that the heat pipe 40 has excellent heat transfer performance, this embodiment sets the material of the heat pipe 40 to metal, but technicians can set the material of the heat pipe 40 to thermal conductive ceramics or plastics, etc. in addition to metal according to actual needs.

[0044] In addition, depending on the usage situation, the medium that can be pumped into the heat pipe 40 is also the same. For example, when cooling treatment is required, cooling medium can be pumped in, and when heating treatment is required, high-temperature medium can be pumped in. The specific medium pumped in can be water, liquid metal, ethylene glycol and a mixture thereof.

[0045] Furthermore, in order to improve energy utilization efficiency, the heat pipe 40 can be configured as a microchannel heat exchanger or a heat pipe.

[0046] The above description has already provided the basic structure and functions of the main components of this embodiment. To better illustrate the working principle of this embodiment, three different scenarios are provided below:

[0047] Scene 1

[0048] During the high-rate charge and discharge process of the cylindrical battery cell 20, the excess heat generated will cause the temperature of the cylindrical battery cell 20 to rise sharply. When the temperature reaches the phase change threshold of the serpentine phase change material plate 30 (that is, the melting point of the serpentine phase change material plate 30), the serpentine phase change material plate 30 can not only quickly absorb the heat generated by the cylindrical battery cell 20 through phase change, but also maintain the basic stability of the temperature, thereby slowing down the temperature rise rate of the cylindrical battery cell 20 and maintaining the temperature of the cylindrical battery cell 20 within a safe range. Moreover, the compact serpentine structure of the serpentine phase change material plate 30 can also maintain the energy density of the cylindrical battery cell 20 to the greatest extent.

[0049] Scene 2

[0050] Under extremely hot working conditions, the serpentine phase change material plate 30 is saturated with heat. At this time, by pumping the cooling medium into the heat pipe 40, the heat in the system is taken away, which not only further maintains the appropriate temperature in the system, but also avoids the risk of heat transfer medium leakage and battery short circuit caused by rupture of the heat pipe 40.

[0051] Scene 3

[0052] Under extremely cold working conditions, the cylindrical battery core 20 is heated by pumping a high-temperature heat transfer medium into the heat pipe 40. At this time, not only can the cylindrical battery core 20 be regulated to a suitable temperature, but the thermal buffering effect of the serpentine phase change material plate 30 can also be used to avoid local overheating of the cylindrical battery core 20.

[0053] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A heat pipe embedded serpentine phase change material battery thermal management device, characterized in that: It includes a base, a cylindrical battery cell and a serpentine phase change material plate; A plurality of cylindrical battery cells are provided on the base; The plurality of cylindrical cells are arranged in an array; The plurality of serpentine phase change material plates are respectively bonded to the plurality of cylindrical battery cells, and heat pipes are buried inside the plurality of serpentine phase change material plates; The heat conducting pipe is extended along the length direction of the serpentine phase change material plate, and the liquid inlet and the liquid outlet of the heat conducting pipe are both exposed outside the serpentine phase change material plate.

2. The heat pipe embedded serpentine phase change material battery thermal management device according to claim 1, characterized in that: The base is provided with a plurality of battery cell placement grooves, and the plurality of cylindrical battery cells are respectively installed in the plurality of battery cell placement grooves.

3. The heat pipe embedded serpentine phase change material battery thermal management device according to claim 1, characterized in that: The base is provided with a plurality of serpentine grooves, and a plurality of serpentine phase change material plates are respectively installed in the plurality of serpentine grooves.

4. The heat pipe embedded serpentine phase change material battery thermal management device according to claim 1, characterized in that: Thermal conductive glue is provided at the joints between the serpentine phase change material plate and the cylindrical battery core.

5. The heat pipe embedded serpentine phase change material battery thermal management device according to claim 3, characterized in that: The thermally conductive adhesive is organic thermally conductive adhesive, thermally conductive mud, thermally conductive silica gel pad or silicone thermally conductive adhesive.

6. The heat pipe embedded serpentine phase change material battery thermal management device according to claim 1, characterized in that: The heat pipe is made of metal, heat-conducting ceramic or plastic.

7. The heat pipe embedded serpentine phase change material battery thermal management device according to claim 1, characterized in that: The serpentine phase change material plate is an insulating serpentine phase change material plate.

8. The heat pipe embedded serpentine phase change material battery thermal management device according to claim 1, characterized in that: The serpentine phase change material plate is a flame retardant serpentine phase change material plate.

Images