Temperature control device of battery charging station

Abstract

The utility model provides a battery charging station temperature control device which comprises a circulating pump, a control unit, a compressor, a four-way valve, a heat pump-air side heat exchanger, a throttling valve and a heat pump-liquid side heat exchanger. The heat pump-air side heat exchanger, the throttling valve and a first inlet and a first outlet of the heat pump-liquid side heat exchanger are sequentially connected between a first outlet and a second outlet of the four-way valve in series, and a third outlet of the four-way valve is connected with the air inlet end of the compressor. A second inlet of the heat pump-liquid side heat exchanger is connected with the circulating pump and then used for being connected with the liquid outlet end of a cooling liquid circulating pipeline, and a second outlet of the heat pump-liquid side heat exchanger is used for being connected with the liquid inlet end of the cooling liquid circulating pipeline; the control unit obtains the temperature of the cooling liquid in real time and controls the four-way valve to act according to the obtained temperature of the cooling liquid and a preset threshold value. The temperature control device disclosed by the utility model has refrigerating and heating functions.

Description

Technical Field

[0001] The utility model relates to the technical field of battery temperature control equipment, in particular to a battery charging station temperature control device. Background Art

[0002] With the electrification of automobile power and the vigorous development of the new energy automobile industry, more and more owners of hybrid or pure electric vehicles choose batteries as energy sources, and the market demand for new energy electric vehicle charging stations or energy storage and discharge equipment is increasing. The popularity of electric vehicle fast charging stations has greatly facilitated the charging needs of electric vehicle users, so that users no longer dare to travel long distances due to insufficient power. Electric vehicle charging stations are equipment that first stores electrical energy in the energy storage battery inside, and then quickly charges the electric vehicle from the energy storage battery through the charger.

[0003] The temperature of the energy storage battery will rise during the charging and discharging process, and the battery temperature is one of the key factors affecting the battery performance and life. If the battery temperature is the threshold temperature or higher, it will cause the charging and discharging to be suspended, which will reduce the charging and discharging efficiency and even affect the battery life. Therefore, electric vehicle fast charging stations are equipped with temperature control systems, but the temperature control systems of existing charging stations usually only have a single cooling or heating function. Since the ambient temperature is one of the important factors affecting the battery temperature, in different regions with large ambient temperature differences or in different seasons in the same region, it cannot well cope with the impact of ambient temperature changes on the battery temperature, and cannot well meet the needs of differentiated battery temperature control. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a battery charging station temperature control device with cooling and heating functions, which can heat and cool the coolant of the battery pack of the charging station, so as to solve the problem that the temperature control system of the existing charging station usually only has a single cooling or heating function, cannot cope with the impact of ambient temperature changes on the battery temperature, and cannot meet the need for differentiated battery temperature control.

[0005] In order to solve the above technical problems, the technical solution used in the utility model is:

[0006] The utility model discloses a temperature control device for a battery charging station, comprising a temperature regulating unit, a circulating pump and a control unit. The operating modes of the temperature regulating unit include heating and cooling. The temperature regulating unit comprises a compressor, a four-way valve, a heat pump-air side heat exchanger, a throttle valve and a heat pump-liquid side heat exchanger. The exhaust end of the compressor is connected to the inlet of the four-way valve. The heat pump-air side heat exchanger, the throttle valve and the first inlet and the first outlet of the heat pump-liquid side heat exchanger are sequentially connected in series between the first outlet and the second outlet of the four-way valve. The third outlet of the four-way valve is connected to the air inlet end of the compressor.

[0007] The second inlet of the heat pump-liquid side heat exchanger is connected to the circulation pump and is used to be connected to the liquid outlet of the circulation pipeline of the battery pack coolant in the charging station. The second outlet of the heat pump-liquid side heat exchanger is used to be connected to the liquid inlet of the circulation pipeline of the battery pack coolant in the charging station. The heat pump-liquid side heat exchanger is used to perform heat exchange with the coolant flowing through it, and the circulation pump is used to provide power for the circulation flow of the battery pack coolant;

[0008] The compressor is electrically connected to the control unit, and the four-way valve is communicatively connected to the control unit. The control unit obtains the coolant temperature in real time, and controls the action of the four-way valve according to the obtained coolant temperature and a preset threshold value to adjust the operation mode of the temperature regulating unit.

[0009] Preferably, it also includes a protective shell having a cavity and a fan, the temperature adjustment unit, the circulation pump and the control unit are all fixed in the cavity of the protective shell, the protective shell has a plurality of ventilation holes on at least one side wall, and the fan is arranged on the other side of the protective shell.

[0010] Further preferably, it further comprises a pre-cooling unit and a switching valve, the circulating pump is communicated with the inlet of the switching valve, the first outlet of the switching valve is communicated with the second inlet of the heat pump-liquid side heat exchanger, and the pre-cooling unit is connected in series between the second outlet of the switching valve and the second inlet of the heat pump-liquid side heat exchanger;

[0011] The switching valve is communicatively connected to the control unit, and the control unit also obtains the ambient temperature in real time, and calculates the temperature difference between the obtained coolant temperature and the ambient temperature, and controls the action of the switching valve according to the calculated temperature difference and a preset temperature difference threshold.

[0012] More preferably, the pre-cooling unit and the heat pump-air side heat exchanger are both fin heat exchangers.

[0013] More preferably, both sides of the pre-cooling unit and the heat pump-air-side heat exchanger are detachably connected to the corresponding side walls of the protective shell through brackets, so that the pre-cooling unit and the heat pump-air-side heat exchanger are vertically fixed in the protective shell, and the pre-cooling unit and the heat pump-air-side heat exchanger form an angle with the side wall of the protective shell.

[0014] More preferably, there are multiple fans, which are fixed in sequence up and down along the side wall of the protective shell.

[0015] Preferably, the heat pump-liquid side heat exchanger is a plate heat exchanger, and the plate heat exchanger is detachably connected to the side wall of the protective shell via a fixing plate.

[0016] Preferably, an electrical box is disposed in the protective shell, the control unit is fixed in the electrical box, and the electrical box is detachably connected to the side wall of the protective shell.

[0017] Preferably, the side wall of the protective shell is provided with an inspection door.

[0018] Further preferably, the preset temperature difference threshold is not less than 5°C.

[0019] Compared with the prior art, the beneficial effects of the temperature control device for a battery charging station described in the utility model are mainly reflected in:

[0020] The temperature regulating unit in the device of the utility model is provided with the four-way valve, and the coolant temperature is obtained in real time by the control unit. According to the obtained coolant temperature and the preset threshold value, the action of the four-way valve is controlled, so as to change the flow direction of the high-temperature refrigerant gas discharged from the compressor, and then change the temperature of the refrigerant flowing through the heat pump-liquid side heat exchanger, so that the coolant flowing through the heat pump-liquid side heat exchanger can be heated or cooled. Therefore, it is possible to cope with the influence of different ambient temperatures on the coolant temperature of the battery pack, and in different regions with large ambient temperature differences or in different seasons in the same region with large temperature differences, the coolant can be kept at a suitable operating temperature, thereby effectively improving the charging and discharging efficiency and stability of the charging pile, and solving the problem that the temperature control system of the existing charging station usually only has a single cooling or heating function, cannot cope with the influence of ambient temperature changes on the battery temperature, and cannot meet the needs of differentiated battery temperature control. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other purposes, features and advantages of the present invention will become more apparent through a more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals in all the accompanying drawings indicate the same parts, and the drawings are not intentionally scaled to the actual size, but the focus is on illustrating the subject matter of the present invention.

[0022] Figure 1 A three-dimensional diagram of a temperature control device for a battery charging station provided by an embodiment of the utility model;

[0023] Figure 2 A schematic diagram of the internal structure of a battery charging station temperature control device provided by an embodiment of the utility model Figure 1 ;

[0024] Figure 3 A schematic diagram of the internal structure of a battery charging station temperature control device provided by an embodiment of the utility model Figure 2 ;

[0025] Figure 4 A working principle diagram of a temperature control device for a battery charging station provided by an embodiment of the utility model;

[0026] Description of the drawings: circulation pump 1, compressor 2, four-way valve 3, heat pump-air side heat exchanger 4, throttle valve 5, heat pump-liquid side heat exchanger 6, battery pack 7, protective shell 8, fan 9, ventilation hole 10, pre-cooling unit 11, switching valve 12, bracket 13, fixing plate 14, electrical box 15, inspection door 16. DETAILED DESCRIPTION

[0027] The technical scheme of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the utility model and implement it, but the examples given are not intended to limit the utility model. In the present embodiments, it should be understood that the orientations or positional relationships indicated by terms such as "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the utility model.

[0028] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used in this utility model are for illustrative purposes only.

[0029] This embodiment provides a battery charging station temperature control device, such as Figure 1-4As shown, it includes a temperature regulating unit, a circulating pump 1 and a control unit, wherein the operation modes of the temperature regulating unit include heating and cooling, and the temperature regulating unit includes a compressor 2, a four-way valve 3, a heat pump-air side heat exchanger 4, a throttle valve 5 and a heat pump-liquid side heat exchanger 6, the exhaust end of the compressor 2 is connected to the inlet of the four-way valve 3, the heat pump-air side heat exchanger 4, the throttle valve 5 and the first inlet and the first outlet of the heat pump-liquid side heat exchanger 6 are sequentially connected in series between the first outlet and the second outlet of the four-way valve 3, and the third outlet of the four-way valve 3 is connected to the air inlet end of the compressor 2;

[0030] The second inlet of the heat pump-liquid side heat exchanger 6 is connected to the circulation pump 1 and is used to be connected to the liquid outlet of the coolant circulation pipeline of the battery pack 7 in the charging station. The second outlet of the heat pump-liquid side heat exchanger 6 is used to be connected to the liquid inlet of the coolant circulation pipeline of the battery pack 7 in the charging station. The heat pump-liquid side heat exchanger 6 is used to perform heat exchange with the coolant flowing through it, and the circulation pump 1 is used to provide power for the circulation of the coolant of the battery pack 7;

[0031] The compressor 2 is electrically connected to the control unit, and the four-way valve 3 is communicatively connected to the control unit. The control unit obtains the coolant temperature in real time, and controls the action of the four-way valve 3 according to the obtained coolant temperature and a preset threshold value to adjust the operation mode of the temperature control unit.

[0032] It should be noted that, in this embodiment, by controlling the switching action of the four-way valve 3, the high-temperature and high-pressure gas discharged from the compressor 2 can be controlled to flow into the heat pump-air side heat exchanger 4 first, or flow into the heat pump-liquid side heat exchanger 6 first, thereby changing the temperature of the gas entering the heat pump-liquid side heat exchanger 6. In order to accurately know the real-time temperature of the coolant in the battery pack 7, preferably, the control unit obtains the temperature of the coolant at the outlet end of the coolant circulation pipeline in real time. Specifically, a temperature sensor that is communicatively connected to the control unit can be set at the outlet end of the coolant circulation pipeline to obtain the temperature.

[0033] The temperature regulating unit in this embodiment utilizes the "reverse Carnot cycle" principle of the air energy heat pump, uses the compressor 2 as the power, sets a four-way valve 3, and obtains the coolant temperature in real time through the control unit. According to the obtained coolant temperature and the preset threshold, the four-way valve 3 is controlled to switch, which can change the flow direction of the high-temperature refrigerant gas discharged from the compressor 2, and then change the temperature of the refrigerant flowing through the heat pump-liquid side heat exchanger 6, so that the coolant flowing through the heat pump-liquid side heat exchanger 6 can be heated or cooled, so it can cope with the influence of different ambient temperatures on the coolant temperature of the battery pack 7. In different regions with large ambient temperature differences or in different seasons in the same region with large temperature differences, the coolant can be kept at a suitable working temperature, thereby effectively improving the charging and discharging efficiency and stability of the charging pile, and solving the problem that the temperature control system of the existing charging station usually only has a single cooling or heating function, cannot cope with the influence of ambient temperature changes on the battery temperature, and cannot meet the needs of differentiated battery temperature control.

[0034] In a specific embodiment, when the control unit determines that the obtained coolant temperature is less than the preset threshold value based on the obtained coolant temperature and the preset threshold value, the four-way valve 3 is controlled to be energized and the power is turned on, so that the high-temperature and high-pressure gas discharged from the compressor 2 first flows into the heat pump-liquid side heat exchanger 6, flows through the throttle valve 5, the heat pump-air side heat exchanger 4, and the four-way valve 3 in sequence, and then flows back into the compressor 2. The high-temperature and high-pressure gas flowing into the heat pump-liquid side heat exchanger 6 exchanges heat with the coolant flowing through the heat pump-liquid side heat exchanger 6, thereby increasing the coolant temperature, so that the temperature regulating unit Enter the heating mode; when the above-mentioned control unit determines that the obtained coolant temperature is higher than the preset threshold value based on the obtained coolant temperature and the preset threshold value, the four-way valve 3 is controlled to cut off the power supply, so that the high-temperature and high-pressure gas discharged from the compressor 2 first flows into the heat pump-air side heat exchanger 4, and then flows through the throttle valve 5, the heat pump-liquid side heat exchanger 6, and the four-way valve 3 in turn and then flows back into the compressor 2. The low-temperature and low-pressure gas flowing into the heat pump-liquid side heat exchanger 6 exchanges heat with the coolant flowing through the heat pump-liquid side heat exchanger 6, thereby reducing the coolant temperature, and the temperature regulating unit enters the cooling mode.

[0035] In a preferred embodiment, the temperature control device of the battery charging station also includes a protective shell 8 with a cavity and a fan 9. The above-mentioned temperature adjustment unit, circulation pump 1 and control unit are all fixed in the cavity of the protective shell 8. The protective shell 8 has at least one side wall provided with a plurality of ventilation holes 10. The fan 9 is arranged on the other side of the protective shell 8. The fan 9 can accelerate the air flow in the protective shell 8, thereby accelerating the heat exchange speed between the heat pump-air side heat exchanger 4 and the surrounding air, and improving the cooling or heating efficiency of the device.

[0036] In a further preferred embodiment, the temperature control device of the battery charging station also includes a pre-cooling unit 11 and a switching valve 12, the circulating pump 1 is connected to the inlet of the switching valve 12, the first outlet of the switching valve 12 is connected to the second inlet of the heat pump-liquid side heat exchanger 6, and the pre-cooling unit 11 is connected in series between the second outlet of the switching valve 12 and the second inlet of the heat pump-liquid side heat exchanger 6; the switching valve 12 is communicatively connected to the control unit, and the control unit also obtains the ambient temperature in real time, and calculates the temperature difference between the obtained coolant temperature and the ambient temperature, and controls the operation of the switching valve 12 according to the calculated temperature difference and the preset temperature difference threshold.

[0037] In this embodiment, by providing a precooling unit 11 and a switching valve 12, when the temperature of the coolant is higher than the ambient temperature by a value greater than a preset temperature difference threshold, the control unit controls the switching valve 12 to operate, so that the first outlet of the switching valve 12 is closed and the second outlet is opened, and the coolant is first cooled through the precooling unit 11, and then cooled through the heat pump-liquid side heat exchanger 6, thereby accelerating the cooling speed, quickly restoring the temperature of the coolant to the preset threshold, thereby improving the charging and discharging efficiency of the battery pack 7, avoiding the battery pack 7 from operating at high temperature for a long time, helping to maintain the stability of the charging station when operating at high load for a long time, and reducing possible overheating problems, which is conducive to extending the life of the battery pack 7; when the temperature of the coolant is higher than the ambient temperature by a value not greater than the preset temperature difference threshold or the coolant temperature is lower than the ambient temperature, the control unit controls the switching valve 12 to operate, so that the first outlet of the switching valve 12 is opened and the second outlet is closed, and the coolant flows directly into the heat pump-liquid side heat exchanger 6. Among them, the preset temperature difference threshold is preferably not less than 5°C.

[0038] In a specific embodiment, the precooling unit 11 and the heat pump-air side heat exchanger 4 are both fin heat exchangers. Furthermore, the two sides of the precooling unit 11 and the heat pump-air side heat exchanger 4 are detachably connected to the side walls of the corresponding protective shell 8 through the bracket 13, so as to facilitate assembly and maintenance, so that the precooling unit 11 and the heat pump-air side heat exchanger 4 are vertically fixed in the protective shell 8, and the precooling unit 11 and the heat pump-air side heat exchanger 4 are at an angle to the side walls of the protective shell 8, thereby reducing the space occupied by the two, which is conducive to improving the degree of integrated layout and reducing the external dimensions of the device. Furthermore, there are multiple fans 9, and they are fixed up and down in sequence along the side walls of the protective shell 8, so that the side wall area can be fully utilized, the number of fans 9 is increased, the flow speed of the air in the protective shell 8 is increased, and the heat exchange efficiency between the precooling unit 11 and the heat pump-air side heat exchanger 4 and the air is improved.

[0039] In another specific embodiment, Figures 2 to 3 As shown, the heat pump-liquid side heat exchanger 6 is a plate heat exchanger, and the plate heat exchanger is detachably connected to the side wall of the protective shell 8 through a fixing plate 14.

[0040] In another specific embodiment, Figures 2 to 3 As shown, an electrical box 15 is disposed in the protective shell 8 , the control unit is fixed in the electrical box 15 , and the electrical box 15 is detachably connected to the side wall of the protective shell 8 .

[0041] In another specific embodiment, Figure 1 As shown, the side wall of the protective shell 8 is provided with an inspection door 16 .

[0042] In this specification, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0044] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery charging station temperature control device, characterized in that: include: A temperature regulating unit, a circulation pump and a control unit, wherein the operation modes of the temperature regulating unit include heating and cooling, and the temperature regulating unit includes a compressor, a four-way valve, a heat pump-air side heat exchanger, a throttle valve and a heat pump-liquid side heat exchanger, wherein the exhaust end of the compressor is connected to the inlet of the four-way valve, the heat pump-air side heat exchanger, the throttle valve and the first inlet and the first outlet of the heat pump-liquid side heat exchanger are sequentially connected in series between the first outlet and the second outlet of the four-way valve, and the third outlet of the four-way valve is connected to the air inlet end of the compressor; The second inlet of the heat pump-liquid side heat exchanger is connected to the circulation pump and is used to connect to the liquid outlet of the battery pack coolant circulation pipeline in the charging station. The second outlet of the heat pump-liquid side heat exchanger is used to connect to the liquid inlet of the battery pack coolant circulation pipeline in the charging station. The heat pump-liquid side heat exchanger is used to perform heat exchange with the coolant flowing through it, and the circulation pump is used to provide power for the circulation of the battery pack coolant. The compressor is electrically connected to the control unit, and the four-way valve is communicatively connected to the control unit. The control unit obtains the coolant temperature in real time, and controls the action of the four-way valve according to the obtained coolant temperature and a preset threshold value to adjust the operation mode of the temperature regulating unit.

2. A battery charging station temperature control device according to claim 1, characterized in that: It also includes a protective shell with a cavity and a fan, the temperature adjustment unit, the circulation pump and the control unit are all fixed in the cavity of the protective shell, the protective shell has at least one side wall with a plurality of ventilation holes, and the fan is arranged on the other side of the protective shell.

3. A battery charging station temperature control device according to claim 2, characterized in that: It also includes a precooling unit and a switching valve, the circulating pump is communicated with the inlet of the switching valve, the first outlet of the switching valve is communicated with the second inlet of the heat pump-liquid side heat exchanger, and the precooling unit is connected in series between the second outlet of the switching valve and the second inlet of the heat pump-liquid side heat exchanger; The switching valve is communicatively connected to the control unit, and the control unit also obtains the ambient temperature in real time, and calculates the temperature difference between the obtained coolant temperature and the ambient temperature, and controls the action of the switching valve according to the calculated temperature difference and a preset temperature difference threshold.

4. A battery charging station temperature control device according to claim 3, characterized in that: The pre-cooling unit and the heat pump-air side heat exchanger are both fin heat exchangers.

5. A battery charging station temperature control device according to claim 4, characterized in that: The two sides of the pre-cooling unit and the heat pump-air side heat exchanger are detachably connected to the corresponding side walls of the protective shell through brackets, so that the pre-cooling unit and the heat pump-air side heat exchanger are vertically fixed in the protective shell, and the pre-cooling unit and the heat pump-air side heat exchanger form an angle with the side wall of the protective shell.

6. A battery charging station temperature control device according to claim 5, characterized in that: There are multiple fans, which are fixed in sequence up and down along the side wall of the protective shell.

7. A battery charging station temperature control device according to claim 2, characterized in that: The heat pump-liquid side heat exchanger is a plate heat exchanger, and the plate heat exchanger is detachably connected to the side wall of the protective shell through a fixing plate.

8. A battery charging station temperature control device according to claim 2, characterized in that: An electrical box is arranged in the protective shell, the control unit is fixed in the electrical box, and the electrical box is detachably connected to the side wall of the protective shell.

9. A battery charging station temperature control device according to claim 2, characterized in that: The side wall of the protective shell is provided with an inspection door.

10. A battery charging station temperature control device according to claim 3, characterized in that: The preset temperature difference threshold is not less than 5°C.

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