Temperature control accessory based on phase change material

Abstract

The utility model relates to the technical field of battery thermal management, and particularly discloses a temperature control fitting based on a phase change material, which comprises a shell, a vibration trigger mechanism is arranged in the shell, the shell is filled with a supercooled phase change material, and a heat exchange tube for heat exchange with the supercooled phase change material is also arranged in the shell. Two ends of the heat exchange tube are detachably and hermetically connected with a refrigerant inlet and a refrigerant outlet of the battery pack respectively; the vibration triggering mechanism is electrically connected with a vibration controller, the vibration controller is arranged outside the shell, the vibration controller is electrically connected with a vehicle control unit of the vehicle, and the vibration controller is used for receiving a power-on signal of the vehicle control unit and controlling the vibration triggering mechanism to vibrate. The utility model aims to solve the problems that the existing battery pack adopts a phase change material and needs to replace the existing vehicle thermal management system, and the transformation cost is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery thermal management technical field, especially relate to a temperature control accessory based on phase change material. BACKGROUND

[0002] With the rapid development of electric vehicle industry, the use of pure electric vehicles is more and more common. Power lithium ion battery (hereinafter referred to as lithium battery) has the advantages of high energy density, long cycle life, low self-discharge rate and no memory effect, and is widely used in electric vehicles, electric tools and aerospace fields. Lithium battery has been widely used in the automobile industry, however, the best performance of lithium ion battery of lithium battery should be between 15-40℃, and the performance of the battery will be affected beyond this temperature range. For example, in low temperature environment, the charging capacity of the battery will be greatly reduced, and the discharge capacity will also be significantly attenuated. While in high temperature environment, the internal impedance of the battery will increase, resulting in reduced discharge efficiency, and the cycle life of the battery will also be shortened, and in extreme cases, it will also cause explosion and other accidents. Therefore, it is very important to efficiently manage the battery of pure electric vehicles.

[0003] Electric vehicle thermal management technology has been relatively mature from the beginning to today, including air-cooled, liquid-cooled, phase change material type, etc. The air-cooled type has the disadvantage of poor cooling effect due to low thermal conductivity, resulting in uneven distribution of battery temperature and increased energy consumption. The liquid cooling system also needs additional energy, similar to the air cooling system. The existing phase change cooling mainly wraps the battery monomer or battery pack in a phase change module to form a battery pack, and uses the volume change characteristics of the phase change material to realize thermal switch and uses the latent heat storage of the phase change process to realize thermal buffer or low temperature heating. Although no additional energy is needed, this structure needs to replace the existing vehicle thermal management system of the battery pack, which has high modification cost. SUMMARY

[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a temperature control accessory based on phase change material, which solves the problem of high modification cost of replacing the existing vehicle thermal management system of the existing battery pack with phase change material.

[0005] In order to solve the above problems, the utility model adopts the technical scheme: a temperature control accessory based on phase change material, including a shell, a vibration trigger mechanism is arranged in the shell and filled with supercooled phase change material, a heat exchange pipe for heat exchange with the supercooled phase change material is also arranged in the shell, and the two ends of the heat exchange pipe are respectively detachably and sealingly connected with the refrigerant inlet and outlet of the battery pack. The vibration trigger mechanism is electrically connected with a vibration controller, and the vibration controller is arranged outside the shell. The vibration controller is electrically connected with the vehicle controller, and the vibration controller is used for receiving the power-on signal of the vehicle controller and controlling the vibration of the vibration trigger mechanism.

[0006] The technical principle generated by the present scheme is that: the phase change material is a substance that changes from one phase to another phase when the temperature or other conditions change. In the phase change material, the difference between the equilibrium phase change temperature and the actual transition temperature when the substance changes after cooling to a certain temperature below the phase change point is also called supercooling degree. The phase change supercooling phenomenon is generally considered to be eliminated, and the supercooling degree is reduced by increasing nucleating agents, electric current, ultrasonic waves and the like to make the melting point and the solidification point consistent to avoid the stored heat from being unable to be released. In order to distinguish from the ordinary phase change material without obvious supercooling degree and the cold phase change material indicating a lower phase change temperature, the supercooling phase change material described in the present patent specifically refers to the phase change material with a larger supercooling degree. The supercooling degree of the phase change material has an important role in the phase change process. First, it will cause a delay in the start of the phase change. In other words, below the supercooling temperature, the phase change does not necessarily start immediately, but needs to wait until a certain critical condition, such as vibration, is met. The thermal start of the battery can take advantage of this feature of the phase change material.

[0007] Taking winter as an example, when the battery of the car is working, the cooling system is started, and part of the heat transferred out through the refrigerant in the heat exchange pipe is absorbed and stored by the supercooling module, and the storage temperature point is 30-35℃; when the car stops, due to the extremely low ambient temperature, the supercooling phase change module, along with the decrease of the ambient temperature. Due to its supercooling characteristics, the heat stored in the material is not released. When the car starts again, the vibration trigger mechanism vibrates, the supercooling phase change material module, and the heat is released instantaneously, the temperature returns to 30-35℃, and the battery is heated by heating the refrigerant medium in the heat exchange pipe.

[0008] The beneficial effects generated by the present scheme are: by taking advantage of the characteristics of the supercooling phase change material with a larger supercooling degree, filling the supercooling phase change material in the shell, using the vibration controller and the micro vibration motor to vibrate when the car starts, thereby releasing the heat stored in the phase change material, achieving the heating of the battery pack without additional energy, and raising the temperature to the optimal working temperature of the battery. At the same time, the device can be externally connected to the existing thermal management system of the electric vehicle, i.e. connected between the battery pack and the cooling system, which can play a role in the thermal regulation of the battery. The structure is simple to modify, and as a temperature control accessory, it can be easily disassembled.

[0009] The application of phase change materials not only allows the battery to quickly rise to the optimal working temperature in winter low temperature environment, reducing the performance loss of the battery, but also absorbs the excess heat in the battery structure in summer and daily work, ensuring that the battery does not overheat, thereby reducing the performance loss of the battery and prolonging the service life of the battery.

[0010] Further, one end of the heat exchange pipe is connected with the battery pack refrigerant outlet, and the other end is connected with an electric control three-way valve, the other two interfaces of the electric control three-way valve are respectively connected with the automobile self cooling system inlet hole and the battery pack refrigerant inlet, and the electric control three-way valve is electrically connected with the automobile battery control unit. The communication direction of the electric control three-way valve is controlled through the control unit, so that the series connection and parallel connection between the temperature control accessory and the existing cooling system of the automobile are switched.

[0011] Further, the vibration trigger mechanism adopts a waterproof micro vibration motor. The structure is small and the cost is low, which can be placed in any position in the shell.

[0012] Further, the vibration trigger mechanism vibrates for 1-5S. Short vibration can trigger the phase change material and release heat.

[0013] Further, the vibration trigger mechanism is provided with 2-3 in the shell. By setting multiple vibration trigger mechanisms, different positions of the phase change material can be vibrated at the same time, so that the phase change material can be quickly triggered and heat can be released.

[0014] Further, the shell is a flat rectangular parallelepiped, and the heat exchange pipe is bent into a serpentine coil in the shell. The flat rectangular parallelepiped is convenient to put into the automobile, and the heat exchange pipe is bent into a serpentine coil along the length direction in the shell, so that the heat exchange area is increased and the heat exchange efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is an embodiment schematic diagram of the utility model.

[0016] Figure 2 It is a supercooled phase change material temperature curve schematic diagram. DETAILED DESCRIPTION

[0017] The following will be further described in detail through specific embodiments:

[0018] The reference signs in the drawings of the specification include: battery pack 1, shell 2, supercooled phase change material 21, heat exchange pipe 22, vibration trigger mechanism 23, cooling system 3, electric control three-way valve 4.

[0019] Embodiment 1 is as follows: Figure 1As shown: a temperature control accessory based on phase change material, including a shell 2, a vibration trigger mechanism 23 is arranged in the shell 2 and filled with supercooled phase change material 21, the shell 2 is also provided with heat exchange pipe 22 which exchanges heat with supercooled phase change material 21, the two ends of heat exchange pipe 22 are respectively detachably sealed connected with the refrigerant inlet and outlet of battery pack 1; the vibration trigger mechanism 23 is electrically connected with a vibration controller, which is arranged outside the shell 2, not shown in the figure, and is electrically connected with the vehicle's own vehicle controller, and is used for receiving the power-on signal of the vehicle controller and controlling the vibration of the vibration trigger mechanism 23. The vibration trigger mechanism 23 adopts a miniature waterproof vibration motor. The vibration duration of the vibration trigger mechanism 23 is 1-5S, and the embodiment is 3S. The vibration trigger mechanism is arranged in the shell 2 with an interval of 2. The shell 2 is a flat rectangular parallelepiped, and the heat exchange pipe 22 is bent into a serpentine coil in the shell 2.

[0020] In the winter of the northern cold region, the phase change temperature of the supercooled phase change material is 30-35℃. When the automobile battery works, the cooling system starts, and part of the heat transferred out by the refrigerant in the heat exchange pipe 22 is absorbed and stored by the supercooling module, and the storage temperature point is 30-35℃; when the automobile stops, due to the extremely low environmental temperature, the supercooling phase change module, along with the reduction of the environmental temperature. Due to its supercooling characteristics, the heat stored by the material is not released. When the automobile starts again, the vibration trigger mechanism vibrates, the supercooled phase change material module instantaneously releases heat, and the temperature returns to 30-35℃, thereby heating the battery by heating the refrigerant medium in the heat exchange pipe 22.

[0021] One end of the heat exchange pipe 22 is connected with the refrigerant outlet of the battery pack 1, and the other end is connected with an electrically controlled three-way valve 4, and the other two interfaces of the electrically controlled three-way valve 4 are respectively connected with the inlet hole of the automobile's own cooling system 3 and the refrigerant inlet of the battery pack 1. The electrically controlled three-way valve 4 is electrically connected with the automobile battery control unit, and the automobile battery control unit controls the communication direction of the electrically controlled three-way valve according to the temperature data of the temperature sensor in the existing battery thermal management system of the electric vehicle. For example, when the temperature exceeds the set temperature range and the duration exceeds the set time, the electrically controlled three-way valve is adjusted to make the temperature control accessory and the cooling system 3 in series, at which time the temperature of the battery pack 1 is adjusted by the temperature control accessory and the cooling system 3; if the temperature exceeds the set temperature range or exceeds the set temperature range but the duration does not exceed the set time, the electrically controlled three-way valve is adjusted to make the temperature control accessory and the cooling system 3 parallel, at which time only the temperature control accessory is used to adjust the temperature of the battery pack 1.

[0022] The temperature curve of the phase change material is as shown in Figure 2 Each temperature point represents a different meaning. Taking the application in the automobile internal battery as an example:

[0023] AB section: this section is the heating stage; the phase change material is coated on the surface of the battery, when the car starts, the phase change material starts to absorb and store the heat generated;

[0024] BC section: this section is the phase change latent heat; the phase change material continues to absorb and store heat;

[0025] CD section: this section is the heat capacity stage; because the amount of phase change material used in the battery is limited, when the phase change material stores heat to the full value, the temperature of the phase change material will rise with the ambient temperature;

[0026] DE section: when the car stops using, the temperature of the phase change material will also decrease with the decrease of the ambient temperature, but the phase change material will not release heat in this process;

[0027] EF section: this stage continues to keep warm;

[0028] FG section: this stage is the "trigger" stage, that is, when the car is started again, the phase change material is triggered by the internal vibration device to instantly rise to the phase change point;

[0029] GH section: this stage is the "heat release" stage of the phase change material;

[0030] Therefore, the phase change material is used to maintain the internal environment temperature of the battery, so that the battery can be quickly heated and normally work even in the low temperature environment in winter.

[0031] The above is only an embodiment of the present application, and the specific structure and characteristics of the known scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A temperature controlled accessory based on a phase change material, characterized in that: The shell is internally provided with a vibration trigger mechanism and filled with a supercooled phase change material, and the shell is further provided with a heat exchange pipe in thermal exchange with the supercooled phase change material, and the two ends of the heat exchange pipe are respectively detachably and sealingly connected with the refrigerant inlet and outlet of the battery pack; the vibration trigger mechanism is electrically connected with a vibration controller, the vibration controller is arranged outside the shell, the vibration controller is electrically connected with a vehicle controller of the vehicle, and the vibration controller is used for receiving a power-on signal of the vehicle controller and controlling the vibration of the vibration trigger mechanism.

2. A temperature controlled accessory based on phase change material according to claim 1, characterized in that: One end of the heat exchange pipe is connected with the refrigerant outlet of the battery pack, and the other end is connected with an electrically-controlled three-way valve, and the other two interfaces of the electrically-controlled three-way valve are respectively connected with an inlet hole of a self-owned cooling system of the vehicle and a refrigerant inlet of the battery pack, and the electrically-controlled three-way valve is electrically connected with a battery control unit of the vehicle.

3. A temperature controlled accessory based on phase change material according to claim 1, characterized in that: The vibration trigger mechanism adopts a waterproof vibration motor.

4. A temperature controlled accessory based on phase change material according to claim 1, characterized in that: The vibration duration of the vibration trigger mechanism is 1-5 seconds.

5. A temperature controlled accessory based on phase change material according to claim 1, characterized in that: The vibration trigger mechanism is spaced apart by 2-3 in the shell.

6. A temperature controlled accessory based on phase change material according to claim 1, characterized in that: The shell is a flat rectangular parallelepiped, and the heat exchange pipe is bent into a serpentine coil in the shell.

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