Electronic fan control system of battery thermal management system for energy storage

Abstract

The utility model relates to the technical field of air conditioners and heat management, in particular to an electronic fan control system of a battery heat management system for energy storage, which comprises a cooling liquid circulation pipeline, a coolant circulation pipeline and a heat exchanger, and the heat exchanger is provided with a first heat exchange channel and a second heat exchange channel. The cooling liquid circulation pipeline comprises a first branch, and the first branch comprises a battery pack cooling element, a circulation pump, a three-way valve, a heater and a first heat exchange channel which are connected in series. The fan set designed by the utility model comprises a plurality of single fans, each single fan is controlled by an independent relay, the implementation scheme is simple and reliable, one or more single fans in the fan set can be started and stopped by controlling different numbers of relays, and different numbers of single fans can be started and stopped according to needs so as to meet different cooling capacity requirements; the control mode of the fan is easy to maintain and low in cost, and the service life of the fan can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners and thermal management, and particularly relates to an electronic fan control system for a battery thermal management system for energy storage. Background Art

[0002] The charge and discharge performance and lifespan of a battery pack determine the performance of the device, and these parameters are mainly affected by the battery operating temperature. Thermal management systems are widely used in the field of battery temperature control. By cooling or heating the battery system, the optimal operating temperature of the battery is maintained, thereby improving the charge and discharge performance of the battery, extending its lifespan, and increasing safety.

[0003] Current thermal management systems have drawbacks such as high cost, large volume, and complex control methods. In particular, in existing energy storage thermal management systems, a fan drive board is commonly used to control the fan. This method has a complex circuit design, occupies too much space in the system, and is not conducive to installation and maintenance. Summary of the Utility Model

[0004] In view of the technical problems existing in the electronic control system in the prior art, a first aspect of the utility model provides an electronic fan control system for a battery thermal management system for energy storage, including a coolant circulation pipeline, a coolant circulation pipeline, and a heat exchanger. The heat exchanger is provided with a first heat exchange channel and a second heat exchange channel;

[0005] The coolant circulation pipeline is connected to a battery pack cooling element inside the battery pack, and exchanges heat with the battery pack through the flow of coolant in the battery pack cooling element;

[0006] The coolant circulation pipeline includes a first branch. The first branch includes an inlet and an outlet of the battery pack cooling element, and a circulation pump, a three-way valve, a heater, and a first heat exchange channel that are sequentially connected by pipelines between the inlet and the outlet of the cooling channel;

[0007] The coolant circulation pipeline includes a compressor and a first condenser that are sequentially connected by pipelines between the inlet and the outlet of the second heat exchange channel;

[0008] The first branch exchanges heat with the coolant circulation pipeline through the heat exchanger, and the coolant circulation pipeline exchanges heat with the ambient air through the first condenser;

[0009] A controller;

[0010] Wherein, the first condenser is cooled by a group of cooling fans. The cooling fans include multiple single fans, and each single fan is individually connected to a power supply circuit through a corresponding relay. The controller controls the state of the relay to enable one or more single fans to cool the first condenser.

[0011] Preferably, a first pressure sensor is provided at the intake end of the compressor, and a second pressure sensor is provided at the exhaust end of the compressor. The first pressure sensor is used to detect the intake pressure of the compressor, and the second pressure sensor is used to detect the exhaust pressure of the compressor. An inlet water temperature sensor is provided at the water inlet end of the battery pack cooling element, and an outlet water temperature sensor is provided at the water outlet end of the battery pack cooling element.

[0012] Preferably, the controller includes a refrigeration mode and a PID control mode. In the refrigeration mode, the controller controls the compressor to operate at maximum power, and the radiator fan turns on a fixed number of single fans. In the PID control mode, the number of single fans turned on in the radiator fan is controlled according to the exhaust pressure of the compressor.

[0013] Preferably, the exhaust pressure includes several gears, and the number of gears is one more than the number of single fans. Among them, the pressure magnitude of the gear corresponds to the number of single fans turned on.

[0014] Preferably, the radiator fan includes three single fans, and the exhaust pressure includes four gears. The pressure increases from the first gear, the second gear, the third gear to the fourth gear. The first gear corresponds to starting zero single fans, the second gear corresponds to starting one single fan, the third gear corresponds to starting two single fans, and the fourth gear corresponds to starting three single fans.

[0015] Preferably, the coolant circulation pipeline further includes the second branch. The second branch includes a second condenser connected by a pipeline between the three-way valve and the water inlet of the battery pack cooling element. The second branch exchanges heat with the ambient air through the first condenser.

[0016] Preferably, the first condenser and the second condenser are cooled by the same set of the radiator fans together.

[0017] Preferably, the three-way valve includes a first two-way passage and a first three-way passage. When the temperature is greater than the preset value, the first two-way passage of the three-way valve is conducted, and the first branch is conducted. When the temperature is less than the preset value, the first three-way passage of the three-way valve is conducted, and the second branch is conducted.

[0018] Preferably, the controller controls the number of single fans turned on according to the inlet water temperature of the battery pack cooling element.

[0019] Preferably, the radiator fan includes three single fans. When the difference between the inlet water temperature and the target inlet water temperature is less than the lower limit of the target range, one single fan is started. When the difference between the inlet water temperature and the target inlet water temperature is within the target range, two single fans are started. When the difference between the inlet water temperature and the target inlet water temperature is greater than the upper limit of the target range, three single fans are started.

[0020] Compared with the prior art, the advantages of the present utility model are as follows:

[0021] The fan group designed by the present utility model includes multiple single fans, and each single fan is controlled by an independent relay. The implementation scheme is simple and reliable. By controlling the number of different relays, the start and stop of one to multiple single fans in the fan group can be realized. Different numbers of single fans can be started and stopped according to needs to meet different cooling capacity requirements. This control method of the fan is easy to maintain, has low cost, and can also prevent the aging caused by the continuous rotation of a single fan, thus extending the service life of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are not intended to be drawn to scale. In the drawings, each identical or approximately identical component shown in each figure may be denoted by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present utility model will be described by way of example and with reference to the drawings, wherein:

[0023] Figure 1 is a schematic structural diagram of the electronic fan control system of the battery thermal management system for energy storage shown by the present utility model;

[0024] Figure 2 is a schematic diagram of the principle of three single fans controlled by relays shown by the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to better understand the technical content of the present utility model, specific embodiments are hereby given and described in conjunction with the accompanying drawings as follows.

[0026] Combined with Figure 1 shown, the first aspect of the present utility model provides an electronic fan control system for a battery thermal management system for energy storage, which includes a coolant circulation pipeline, a coolant circulation pipeline 102, and a heat exchanger 5. The heat exchanger 5 is provided with a first heat exchange channel and a second heat exchange channel. The coolant circulation pipeline is connected to the battery pack cooling element 1 inside the battery pack, and heat exchange with the battery pack is achieved through the flow of coolant in the battery pack cooling element 1; the coolant circulation pipeline includes a first branch 101, and the first branch 101 includes the water inlet and outlet of the battery pack cooling element 1, and a circulation pump 2, a three-way valve 3, a heater 4, and the first heat exchange channel connected in sequence through pipelines between the water inlet and outlet of the cooling channel; the coolant circulation pipeline 102 includes a compressor 7 and a first condenser 8 connected in sequence through pipelines between the water inlet and outlet of the second heat exchange channel.

[0027] Among them, the battery pack cooling element 1 can be selected as a coil arranged around the battery pack or a fin with a water cooling channel, etc., for cooling the battery pack.

[0028] In this way, the first branch and the coolant circulation pipeline 102 are respectively connected to the first heat exchange channel and the second heat exchange channel of the heat exchanger 5. When the battery pack cooling element 1 has a refrigeration requirement, the coolant circulation pipeline 102 can provide cooling capacity for the first branch through the heat exchanger 5.

[0029] Furthermore, the first branch 101 exchanges heat with the coolant circulation pipeline 102 through the heat exchanger 5. The coolant circulation pipeline 102 exchanges heat with the ambient air through the first condenser 8. The coolant in the coolant circulation pipeline 102 is compressed by the compressor 7 in the pipeline, and then exchanges heat with the air through the first condenser 8 and is cooled by the high-temperature and high-pressure refrigerant to become a medium-temperature and high-pressure refrigerant liquid. After evaporating and absorbing the heat of the water circulation in the heat exchanger 5, it becomes a superheated refrigerant gas, and enters the compressor 7 after gas-liquid separation, forming a refrigerant cycle.

[0030] Among them, the first condenser 8 is cooled by a group of cooling fans 10. The cooling fans 10 include multiple single fans, and each single fan is individually connected to the power supply circuit through a corresponding relay. The controller 200 controls the state of the relay to make one or more single fans cool the first condenser 8 and the second condenser 9.

[0031] In this way, in this application, only by controlling the corresponding relay of the controller 200 to lose power or get power, the start and stop states of multiple single fans can be controlled. Through the design of multiple single fans, different numbers of single fans can be used as needed, and each time only one single fan is used, it can be replaced and used sequentially to avoid the same single fan running for a long time.

[0032] Furthermore, as Figure 1 shown, a first pressure sensor 71 is provided at the intake end of the compressor 7, and a second pressure sensor 72 is provided at the exhaust end of the compressor 7. The first pressure sensor 71 is used to detect the intake pressure of the compressor, and the second pressure sensor 72 is used to detect the exhaust pressure of the compressor. An inlet temperature sensor 11 is provided at the inlet end of the battery pack cooling element 1, and an outlet temperature sensor 12 is provided at the outlet end of the battery pack cooling element 1.

[0033] Among them, the controller 200 enters different working modes according to the difference between the inlet and outlet water temperatures of the battery pack cooling element 1. When the inlet water temperature is higher than the target temperature by a preset value, it is the refrigeration mode. When the inlet water temperature is lower than the target temperature by a preset value, it is the PID control mode. In the refrigeration mode, the controller 200 controls the compressor 7 to operate at the maximum power, and the cooling fans 10 turn on a fixed number of single fans. In the PID control mode, the number of single fans turned on in the cooling fans 10 is controlled according to the exhaust pressure of the compressor.

[0034] Specifically, when the inlet water temperature is higher than the target temperature by a preset value, the battery pack cooling element 1 has a cooling requirement. Therefore, the system enters the refrigeration mode. The controller 200 first controls two relays to close, causing two single fans to operate for a certain period of time, starting the initial lubrication of the compressor and maintaining it for a certain time, such as 30 s. After the lubrication is completed, the operating state of the radiator fan is controlled based on the comparison between the inlet water temperature and the battery target temperature, specifically using PID control.

[0035] Optionally, the exhaust pressure includes several gears, and the number of gears is one more than the number of single fans. Among them, the pressure magnitude of each gear corresponds to the number of single fans turned on.

[0036] In a specific embodiment, the radiator fan 10 includes three single fans, and the exhaust pressure includes four gears. The pressure increases from the first gear, the second gear, the third gear to the fourth gear. The first gear corresponds to starting zero single fans, the second gear corresponds to starting one single fan, the third gear corresponds to starting two single fans, and the fourth gear corresponds to starting three single fans.

[0037] As Figure 2 shown, the three single fans (10a, 10b, 10c) respectively correspond to the first relay 201, the second relay 202, and the third relay 203. It is defined that the exhaust pressure Pd of the compressor includes 4 gears, which are Pd ≤ A Mpa, A Mpa < Pd ≤ B Mpa, B Mpa < Pd ≤ C Mpa, C Mpa < Pd ≤ D MPa; when Pd ≤ A Mpa, all relays are open; when A Mpa < Pd ≤ B Mpa, one relay closes; when C Mpa < Pd ≤ D MPa, two relays close; when C Mpa < Pd ≤ D MPa, three relays close.

[0038] Furthermore, as Figure 1 shown, the coolant circulation pipeline further includes a second branch 103. The second branch 103 includes a second condenser 9 connected by a pipeline between the three-way valve 3 and the inlet of the battery pack cooling element 1. The second branch 103 exchanges heat with the ambient air through the first condenser 8.

[0039] In this way, when the compressor cannot start under the condition of too low ambient temperature, the second branch 103 can independently exchange heat with the ambient air.

[0040] In a preferred embodiment, the two groups of condensers, the first condenser 8 and the second condenser 9, dissipate heat through the same group of radiator fans 10.

[0041] Specifically, the three-way valve 3 includes a first two-way passage and a first three-way passage. When the temperature is greater than a preset value (for example, the ambient temperature is greater than minus five degrees Celsius), the first two-way passage of the three-way valve 3 is connected, and the first branch 101 is connected. At this time, the circulating pump 2 is connected to the heater 4, wherein the heater 4 is used to maintain the temperature of the coolant in the circulating pipeline. When the temperature is less than a preset value (for example, the ambient temperature is less than minus five degrees Celsius), the first three-way passage of the three-way valve 3 is connected, and the second branch 103 is connected. At this time, the circulating pump 2 is connected to the second condenser 9.

[0042] In this way, the conduction state of the first branch 101 and the second branch 103 is controlled according to the ambient temperature, so that the system can achieve a more energy-saving and reliable operation state.

[0043] In a preferred embodiment, the controller 200 controls the number of activated single fans according to the water inlet temperature of the battery pack cooling element 1 .

[0044] Specifically, the cooling fan 10 includes three single fans. When the difference between the inlet water temperature and the target inlet water temperature is less than the lower limit of the target range, one single fan is started. When the difference between the inlet water temperature and the target inlet water temperature is within the target range, two single fans are started. When the difference between the inlet water temperature and the target inlet water temperature is greater than the upper limit of the target range, three single fans are started.

[0045] In a specific embodiment, the comparison between the inlet water temperature and the target inlet water temperature is as follows:

[0046]

[0047] In combination with the above embodiments, the fan group designed by the utility model includes multiple single fans, each single fan is controlled by an independent relay, the implementation scheme is simple and reliable, and the start and stop of one to more single fans in the fan group can be realized by controlling different numbers of relays. Different numbers of single fans can be started and stopped as needed to meet different cooling requirements. This fan control method is easy to maintain and low in cost. It can also prevent aging caused by continuous rotation of a single fan, and can extend the service life of the fan.

[0048] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. An electronic fan control system for a battery thermal management system for energy storage, characterized in that: It comprises a cooling liquid circulation pipeline, a coolant circulation pipeline (102) and a heat exchanger (5), wherein the heat exchanger (5) is provided with a first heat exchange channel and a second heat exchange channel; The coolant circulation pipeline is connected to a battery pack cooling element (1) inside the battery pack, and heat is exchanged with the battery pack through the flow of the coolant in the battery pack cooling element (1); The coolant circulation pipeline comprises a first branch (101), the first branch (101) comprising a water inlet and a water outlet of a battery pack cooling element (1), and a circulation pump (2), a three-way valve (3), a heater (4) and a first heat exchange channel connected in sequence between the water inlet and the water outlet of the cooling channel through a pipeline; The coolant circulation pipeline (102) comprises a compressor (7) and a first condenser (8) which are sequentially connected through a pipeline between a water inlet and a water outlet of the second heat exchange channel; The first branch (101) exchanges heat with the coolant circulation pipeline (102) through the heat exchanger (5), and the coolant circulation pipeline (102) exchanges heat with ambient air through the first condenser (8); Controller (200); The first condenser (8) dissipates heat through a group of heat dissipation fans (10), the heat dissipation fans (10) include a plurality of single fans, each of the single fans is individually connected to a power supply circuit through a corresponding relay, and the controller (200) controls the state of the relay to enable one or more single fans to dissipate heat for the first condenser (8).

2. The electronic fan control system of the energy storage battery thermal management system according to claim 1, characterized in that: The air inlet end of the compressor (7) is provided with a first pressure sensor (71), and the air outlet end of the compressor (7) is provided with a second pressure sensor (72); the first pressure sensor (71) is used to detect the air inlet pressure of the compressor, and the second pressure sensor (72) is used to detect the air outlet pressure of the compressor; the water inlet end of the battery pack cooling element (1) is provided with a water inlet temperature sensor (11), and the water outlet end of the battery pack cooling element (1) is provided with a water outlet temperature sensor (12).

3. The electronic fan control system of the energy storage battery thermal management system according to claim 2, characterized in that: The controller (200) includes a cooling mode and a PID control mode. In the cooling mode, the controller (200) controls the compressor (7) to operate at maximum power and turns on a fixed number of single fans of the cooling fan (10). In the PID control mode, the number of single fans turned on in the cooling fan (10) is controlled according to the exhaust pressure of the compressor.

4. The electronic fan control system of the energy storage battery thermal management system according to claim 3, characterized in that: The exhaust pressure includes several gears, and the number of the gears is one more than the number of single fans, wherein the pressure size of the gear corresponds to the number of single fans opened.

5. The electronic fan control system of the energy storage battery thermal management system according to claim 3, characterized in that: The heat dissipation fan (10) comprises three single fans, and the exhaust pressure comprises four gears, wherein the pressure increases gradually from the first gear, the second gear, the third gear to the fourth gear, wherein the first gear corresponds to starting zero single fans, the second gear corresponds to starting one single fan, the third gear corresponds to starting two single fans, and the fourth gear corresponds to starting three single fans.

6. The electronic fan control system of the energy storage battery thermal management system according to any one of claims 2 to 5, characterized in that: The coolant circulation pipeline also includes a second branch (103), the second branch (103) includes a second condenser (9) connected between the three-way valve (3) and the water inlet of the battery pack cooling element (1) through a pipeline, and the second branch (103) exchanges heat with the ambient air through the first condenser (8).

7. The electronic fan control system of the energy storage battery thermal management system according to claim 6, characterized in that: The first condenser (8) and the second condenser (9) dissipate heat together through the same group of heat dissipation fans (10).

8. The electronic fan control system of the energy storage battery thermal management system according to claim 6, characterized in that: The three-way valve (3) comprises a first two-way passage and a first three-way passage. When the temperature is greater than a preset value, the first two-way passage of the three-way valve (3) is connected and the first branch (101) is connected. When the temperature is less than the preset value, the first three-way passage of the three-way valve (3) is connected and the second branch (103) is connected.

9. The electronic fan control system of the energy storage battery thermal management system according to claim 8, characterized in that: The controller (200) controls the number of activated single fans according to the water inlet temperature of the battery pack cooling element (1).

10. The electronic fan control system of the energy storage battery thermal management system according to claim 9, characterized in that: The heat dissipation fan (10) comprises three single fans. When the difference between the inlet water temperature and the target inlet water temperature is less than the lower limit of the target range, one single fan is started; when the difference between the inlet water temperature and the target inlet water temperature is within the target range, two single fans are started; and when the difference between the inlet water temperature and the target inlet water temperature is greater than the upper limit of the target range, three single fans are started.

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