Charging station heat exchange method based on ground source system

Abstract

According to the charging station heat exchange method based on the ground source system, a ground source heat pump system is adopted as heat exchange equipment, and the heat exchange efficiency of a charging station is effectively improved through underground low-temperature heat energy; real-time regulation and control of the battery temperature of the new energy automobile are achieved by regulating and controlling the operation parameters of the ground source heat pump unit in real time, and safe operation of the battery is guaranteed; the heat generated by the charging pile and the new energy automobile is recovered and recycled, the energy consumption of the charging station is reduced, and the problems that the heat dissipation effect of an existing charging station heat dissipation mode is greatly influenced by the environment temperature, and the heat dissipation effect is poor in high-temperature weather are solved; an air cooling system is loud in noise and affects the surrounding environment; a water cooling system needs to replace cooling liquid at regular intervals, and the maintenance cost is high.

Description

Technical Field

[0001] The present invention relates to the technical field of charging stations, and in particular to a heat exchange method for charging stations based on a ground source system. Background Art

[0002] With the popularity of new energy vehicles, the construction of charging stations is increasing. However, the charging equipment in the charging station will generate a lot of heat during operation, causing the internal temperature of the charging station to rise, affecting the normal operation and service life of the equipment.

[0003] In the prior art, air cooling or water cooling systems are often used for heat dissipation, but these methods have the following problems:

[0004] 1. The heat dissipation effect is greatly affected by the ambient temperature, and the heat dissipation effect is not good in high temperature weather;

[0005] 2. The air cooling system is noisy and affects the surrounding environment;

[0006] 3. The water cooling system requires regular replacement of coolant, and the maintenance cost is high. Summary of the invention

[0007] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0008] In view of the problems existing in the heat dissipation methods of the above-mentioned existing charging stations, the present invention is proposed.

[0009] Therefore, the technical problem solved by the present invention is: to solve the problem that the heat dissipation effect of the existing charging station heat dissipation method is greatly affected by the ambient temperature and the heat dissipation effect is poor in high temperature weather; the air cooling system has high noise and affects the surrounding environment; the water cooling system needs to replace the coolant regularly and the maintenance cost is high.

[0010] To solve the above technical problems, the present invention provides the following technical solutions: a heat exchange method for a charging station based on a ground source system, comprising the following steps: S1: a ground source heat pump system is set in the charging station, including a ground source heat pump unit, buried pipes, a circulating water pump, a charging pile and a new energy vehicle battery; S2: low-temperature heat energy is extracted from the underground by the ground source heat pump unit, and the heat energy is transferred to the circulating medium; S3: the circulating medium is sent to the charging pile through the circulating water pump to provide a constant temperature environment for the new energy vehicle battery; S4: the battery temperature is detected by the temperature detection component of the new energy vehicle battery, and the temperature signal is transmitted to the ground source heat pump unit; S5: according to the battery temperature, the operating parameters of the ground source heat pump unit are adjusted to realize real-time regulation of the battery temperature.

[0011] As a preferred solution of the heat exchange method of a charging station based on a ground source system described in the present invention, it also includes: during the charging process, the heat generated by the charging pile and the new energy vehicle is recovered by the ground source heat pump system, and the heat is transferred to the ground source heat pump unit; the ground source heat pump unit stores the recovered heat in the buried pipe to realize the recycling of heat.

[0012] As a preferred solution of the heat exchange method for a charging station based on a ground source system described in the present invention, wherein: adjusting the operating parameters of the ground source heat pump unit according to the battery temperature to achieve real-time regulation of the battery temperature specifically includes the following steps: H1: the temperature adjustment unit embedded in the ground source heat pump unit obtains the battery temperature, the ground source temperature and the preset battery target temperature in real time; H2: constructing a feedback control system, inputting the obtained temperature values ​​and various preset parameters, and obtaining the operating parameters of the ground source heat pump unit; H3: adjusting the operating parameters according to the operating parameters obtained in H2 to achieve real-time regulation of the battery temperature;

[0013] Among them, the feedback control system constructed is specifically:

[0014] I(t)=I(t-1)+e(t)Δt(cumulative error of integral term)

[0015] (The differential term represents the rate of change of the error)

[0016] u(t)=k p e(t)+k i I(t)+k d D(t)(control signal)

[0017] Q(t)=αu(t)+Q base (Heat exchange provided by ground source heat pump)

[0018] Where I(t) is the integral function; e(t) is the error signal, e(t) = T b* -T b , T b* is the preset battery target temperature, T b is the battery temperature, T g is the ground source temperature; Q base is the basic heat exchange of the ground source heat pump unit, which is used to maintain the basic temperature level when there is no regulation; α is the conversion coefficient from control signal to heat exchange; k p is the proportional control parameter; k i is the integral control parameter; k d is the differential control parameter; D(t) is the differential term function; u(t) is the control signal function, which is used to adjust the operating parameters of the ground source heat pump unit; Q is the heat exchange amount provided by the ground source heat pump unit.

[0019] As a preferred solution of the heat exchange method for a charging station based on a ground source system described in the present invention, wherein: according to the battery temperature, the operating parameters of the ground source heat pump unit are adjusted to realize real-time regulation of the battery temperature, which specifically includes the following steps: H1: the temperature adjustment unit embedded in the ground source heat pump unit obtains the battery temperature, the ground source temperature and the preset battery target temperature in real time; H2: constructing a temperature line, obtaining the characteristic values ​​of each battery temperature change within the rated time step, synchronously constructing a temperature adjustment model, inputting the obtained characteristic values ​​of each battery temperature change, and obtaining the operating power coefficient of the ground source heat pump unit; H3: adjusting the operating power according to the operating power coefficient obtained in H2 to realize real-time regulation of the battery temperature; wherein, the constructed temperature line, obtaining the characteristic values ​​of each battery temperature change within the rated time step specifically includes the following steps: Q1: obtaining the temperature line within the rated time; Q2: obtaining the change characteristic value of the temperature line;

[0020] The temperature adjustment model constructed is specifically:

[0021]

[0022] Where P is the operating power coefficient of the ground source heat pump unit; t1 and t n is the ordinate of the temperature value corresponding to each reference point on the rated time temperature line; t n is the battery temperature at the current moment; T g is the ground source temperature; t m is the preset battery target temperature; 1.36 and -0.971 are adjustment constants; dx is the integral operation.

[0023] As a preferred solution of the heat exchange method for a charging station based on a ground source system described in the present invention, when adjusting according to the operating power coefficient obtained in H2 to achieve real-time control of the battery temperature:

[0024] P 后 =P 前 *P

[0025] Among them, P 后 is the operating power of the ground source heat pump unit after adjustment; P 前 is the operating power of the ground source heat pump unit before adjustment; P is the operating power coefficient of the ground source heat pump unit.

[0026] As a preferred solution of the heat exchange method for a charging station based on a ground source system described in the present invention, when the circulating water pump is running, wet cleaning is first adopted and then dry cleaning is adopted; wherein, ethanol solvent is used for wet cleaning; wherein, blowing and vacuum cleaning are used for dry cleaning.

[0027] As a preferred solution of the heat exchange method for a charging station based on a ground source system described in the present invention, it also includes pretreatment of the inner wall of the circulating water pump; wherein the pretreatment step is specifically as follows: Step 1: Applying the Fe3O4 coating to the inner wall of the circulating water pump; Step 2: Standing for more than 30 minutes until the Fe3O4 coating is firmly bonded to the inner wall of the circulating water pump.

[0028] As a preferred solution of the heat exchange method for a charging station based on a ground source system described in the present invention, the coating thickness of the Fe3O4 coating is less than 1 mm.

[0029] The present invention provides a charging station heat exchange method based on a ground source system, which has the following beneficial effects:

[0030] The present invention adopts a ground source heat pump system as a heat exchange device, utilizing the low-temperature heat energy underground, effectively improving the heat exchange efficiency of the charging station;

[0031] The present invention achieves real-time control of the temperature of the battery of the new energy vehicle by real-time control of the operating parameters of the ground source heat pump unit, thereby ensuring the safe operation of the battery;

[0032] The present invention realizes the recovery and recycling of heat generated by charging piles and new energy vehicles, and reduces the energy consumption of charging stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0034] Figure 1 This is an overall method flow chart of the charging station heat exchange method based on the ground source system provided by the present invention.

[0035] Figure 2 A flow chart of a method for adjusting the operating parameters of a ground source heat pump unit according to the battery temperature to achieve real-time regulation of the battery temperature provided by the present invention.

[0036] Figure 3 A flow chart of another method for adjusting the operating parameters of a ground source heat pump unit according to the battery temperature to achieve real-time control of the battery temperature provided by the present invention.

[0037] Figure 4 A flow chart of the method for pretreating the inner wall of a circulating water pump provided by the present invention. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0041] The charging equipment in the charging station will generate a lot of heat during operation, causing the temperature inside the charging station to rise, affecting the normal operation and service life of the equipment. In the prior art, air cooling or water cooling systems are often used for heat dissipation, but these methods have the following problems:

[0042] 1. The heat dissipation effect is greatly affected by the ambient temperature, and the heat dissipation effect is not good in high temperature weather;

[0043] 2. The air cooling system is noisy and affects the surrounding environment;

[0044] 3. The water cooling system requires regular replacement of coolant, and the maintenance cost is high.

[0045] Therefore, please refer to Figure 1 The present invention provides a charging station heat exchange method based on a ground source system, comprising the following steps:

[0046] S1: A ground source heat pump system is installed in the charging station, including a ground source heat pump unit, underground pipes, a circulating water pump, a charging pile and a new energy vehicle battery;

[0047] S2: Extract low-temperature heat energy from underground through the ground-source heat pump unit and transfer the heat energy to the circulating medium;

[0048] S3: Send the circulating medium into the charging pile through the circulating water pump to provide a constant temperature environment for the new energy vehicle battery;

[0049] S4: Detect the battery temperature through the temperature detection component of the new energy vehicle battery and transmit the temperature signal to the ground source heat pump unit;

[0050] S5: According to the battery temperature, adjust the operating parameters of the ground source heat pump unit to achieve real-time control of the battery temperature.

[0051] It should be noted that the basic components of the ground source heat pump system are existing conventional components. Installing a ground source heat pump system in a charging station is an innovative way of energy utilization, which can effectively improve energy utilization efficiency and reduce operating costs. The following describes in detail how to integrate a ground source heat pump system in a charging station:

[0052] 1. The ground source heat pump system is mainly composed of the following parts:

[0053] Ground source heat pump unit: It is the core part of the system, responsible for absorbing low-temperature heat from the ground and raising it to high temperature to meet the heating and cooling needs in the charging station.

[0054] Buried pipe: buried underground for heat exchange with soil. The length and layout of the buried pipe are designed according to geological conditions and heat demand.

[0055] Circulating water pump: used to drive the circulating water flow in the ground source heat pump system to ensure that heat can be effectively transferred from the ground to the heat pump unit.

[0056] Charging piles: used to provide charging services for new energy vehicles.

[0057] New energy vehicle batteries: The batteries used in new energy vehicles will generate heat during the charging and discharging process.

[0058] 2. The working principle of the ground source heat pump system is as follows:

[0059] In winter, the ground-source heat pump unit absorbs heat from the soil through the buried pipes and transfers the heat to the heat pump unit through the circulating water pump. The heat pump unit raises the low-temperature heat to high temperature to provide heating for the charging station.

[0060] In summer, the ground-source heat pump unit transfers the heat in the charging station to the buried pipes, using the low temperature underground to dissipate heat and provide cooling for the charging station.

[0061] The heat generated by new energy vehicle batteries during the charging process can be recycled by the heat pump system to reduce energy waste.

[0062] 3. System features:

[0063] High efficiency and energy saving: The ground source heat pump system utilizes the stable temperature of the underground and has the characteristics of high efficiency and energy saving, which can reduce the energy consumption of the charging station.

[0064] Environmental protection and low carbon: During the operation of the system, no pollutants are emitted, which meets the requirements of environmental protection and low carbon.

[0065] Flexible adaptation: The ground source heat pump system can be adjusted according to the actual needs of the charging station and adapt to different seasons and environmental conditions.

[0066] Economical: Although the initial investment is high, the long-term operating cost is low and it is highly economical.

[0067] 4. Implementation steps:

[0068] A preliminary design is carried out based on the geographical location, geological conditions and scale of the charging station.

[0069] Install underground pipes and circulating water pumps to ensure the heat exchange efficiency of the system.

[0070] Install ground source heat pump units and related control systems.

[0071] Integrate with charging piles and new energy vehicle battery systems to achieve heat energy recovery and utilization.

[0072] Carry out system debugging and optimization to ensure stable operation of the system.

[0073] By installing a ground source heat pump system in the charging station, it can not only provide efficient thermal energy services for the charging station, but also promote the sustainable development of new energy vehicles, with high social and environmental benefits.

[0074] Furthermore, during the charging process, the heat generated by the charging piles and new energy vehicles is recovered through the ground source heat pump system and transferred to the ground source heat pump unit; the ground source heat pump unit stores the recovered heat in the buried pipe to achieve heat recycling.

[0075] Further, participation Figure 2 According to the battery temperature, the operating parameters of the ground source heat pump unit are adjusted to achieve real-time regulation of the battery temperature. The specific steps include:

[0076] H1: The temperature adjustment unit embedded in the ground source heat pump unit obtains the battery temperature, ground source temperature and preset battery target temperature in real time;

[0077] H2: Build a feedback control system, input various temperature values ​​and preset parameters, and obtain the operating parameters of the ground source heat pump unit;

[0078] H3: Adjust according to the operating parameters obtained in H2 to achieve real-time control of battery temperature;

[0079] Among them, the feedback control system constructed is specifically:

[0080] I(t)=I(t-1)+e(t)Δt(cumulative error of integral term)

[0081] (The differential term represents the rate of change of the error)

[0082] u(t)=k p e(t)+k iI(t)+k d D(t)(control signal)

[0083] Q(t)=αu(t)+Q base (Heat exchange provided by ground source heat pump)

[0084] Where I(t) is the integral function; e(t) is the error signal, e(t) = T b* -T b , T b* is the preset battery target temperature, T b is the battery temperature, T g is the ground source temperature; Q base is the basic heat exchange of the ground source heat pump unit, which is used to maintain the basic temperature level when there is no regulation; α is the conversion coefficient from control signal to heat exchange; k p is the proportional control parameter; k i is the integral control parameter; kd is the differential control parameter; D(t) is the differential term function; u(t) is the control signal function, which is used to adjust the operating parameters of the ground source heat pump unit; Q is the heat exchange capacity provided by the ground source heat pump unit.

[0085] The control signal u(t) is a PID control signal composed of proportional term, integral term and differential term. It will adjust the operating parameters of the ground source heat pump unit according to the battery temperature error. p , k i and k d These three parameters can achieve precise control of battery temperature.

[0086] Finally, the heat exchange amount Q(t) provided by the ground source heat pump unit is a function of the control signal u(t), which determines the working intensity of the ground source heat pump and thus affects the temperature of the battery.

[0087] This model uses the PID control algorithm to dynamically adjust the operating parameters of the ground source heat pump unit to achieve real-time regulation of the battery temperature.

[0088] It should be noted that the above feedback control system is a discrete time model that requires iterative calculation of the control signal u(t) and the heat transfer Q(t) at each time step Δt. The following is an example of how to use this model for calculation:

[0089] First, initialize all variables:

[0090] I(0)=0 (initial integral term)

[0091] D(0)=0(initial differential term)

[0092] Q(0)=Q bsdc (Initial heat transfer)

[0093] At each time step Δt, the following calculation is performed:

[0094] (Calculate current error)

[0095] I(t)=I(t-1)+e(t)Δt(update integral term)

[0096] (Update the differential term)

[0097] u(t)=k p e(t)+k i I(t)+k d D(t) (calculation control signal)

[0098] Q(t)=αu(t)+Q base (Calculate heat transfer)

[0099] Then, the operating parameters of the ground source heat pump unit are adjusted according to the calculated heat exchange amount Q(t) to control the temperature of the battery.

[0100] The results of this model depend on the following factors:

[0101] Current battery temperature T b and target temperature T b* accurate measurement.

[0102] Ground source temperature T g stability and predictability.

[0103] PID controller parameter k p , k i , k d appropriate adjustments.

[0104] The choice of time step Δt affects the accuracy and real-time performance of the calculation.

[0105] By continuously iterating the above process, the model can dynamically adjust the heat exchange Q(t) to achieve real-time regulation of battery temperature.

[0106] Furthermore, in order to illustrate the iterative process, a calculation example related to specific data is given again:

[0107] Set the initial conditions and parameters:

[0108] Battery target temperature (T b* =25) degrees Celsius

[0109] Current battery temperature (T b(0) =20) degrees Celsius

[0110] Ground source temperature (T g =15) degrees Celsius

[0111] Proportional control parameter (k p =0.5)

[0112] Integral control parameter (k i =0.1)

[0113] Derivative control parameter (k d =0.05)

[0114] Conversion coefficient from control signal to heat transfer (α=10)

[0115] The basic heat exchange capacity of the ground source heat pump unit (Q base =50) Unit heat transfer

[0116] Time step (Δt=1) hour

[0117] Initial state:

[0118] I(0)=0

[0119] D(0)=0

[0120] Q(0)=Q base =50

[0121] Calculation of the first time step:

[0122]

[0123] I(1)=I(0)+e(0)Δt=0+5×1=5

[0124]

[0125] u(1)=k p e(0)+k i I(1)+k d D(1)=0.5×5+0.1×5+0.05×5=2.75

[0126] Q(1)=αu(1)+Q base =10×2.75+50=82.5

[0127] Calculation of the second time step (assuming the battery temperature rises to (T_b(1) = 22) degrees Celsius after the first time step):

[0128]

[0129] I(2)=I(1)+e(1)Δt=5+3×1==8

[0130]

[0131] u(2)=k p e(1)+k i I(2)+k d D(2)=0.5×3+0.1×8+0.05×(-2)=2.3

[0132] Q(2)=αu(2)+Q basc =10×2.3+50=73

[0133] In this example, we calculated the control signal and heat exchange amount for two time steps. At each time step, we adjusted the heat exchange amount based on the error between the actual temperature of the battery and the target temperature. In this way, the system can dynamically adjust the operating parameters of the ground source heat pump to achieve real-time control of the battery temperature.

[0134] This process will continue, and at each time step, the error between the current battery temperature and the target temperature will be used to update the integral term, differential term, and control signal to adjust the heat exchange amount until the battery temperature reaches the target temperature or remains within a stable range.

[0135] Furthermore, the present invention also provides another method for controlling temperature:

[0136] See also Figure 3 According to the battery temperature, the operating parameters of the ground source heat pump unit are adjusted to achieve real-time regulation of the battery temperature. The specific steps include:

[0137] H1: The temperature adjustment unit embedded in the ground source heat pump unit obtains the battery temperature, ground source temperature and preset battery target temperature in real time;

[0138] H2: Construct the temperature line, obtain the characteristic values ​​of each battery temperature change within the rated time step, simultaneously construct the temperature adjustment model, input the obtained characteristic values ​​of each battery temperature change, and obtain the operating power coefficient of the ground source heat pump unit;

[0139] H3: Adjust the operating power according to the operating power coefficient obtained in H2 to achieve real-time control of battery temperature;

[0140] The constructed temperature line to obtain the characteristic values ​​of various battery temperature changes within a rated time step specifically includes the following steps:

[0141] Q1: Get the temperature line within the rated time;

[0142] Q2: Obtain the changing characteristic value of the temperature line;

[0143] Among them, the constructed temperature adjustment model is specifically:

[0144]

[0145] Where P is the operating power coefficient of the ground source heat pump unit; t1 and t n is the ordinate of the temperature value corresponding to each reference point on the rated time temperature line; t n is the battery temperature at the current moment; T g is the ground source temperature; t m is the preset battery target temperature; 1.36 and -0.971 are adjustment constants; dx is the integral operation.

[0146] It should be noted that the rated time step is selected according to the actual situation. For example, 12 hours is selected. The battery temperature is collected on average, and the battery temperature is collected once every hour to form various reference points. The two-dimensional coordinate system is connected with a gentle curve to form a temperature line composed of a group of reference points.

[0147] Furthermore, when the operating power is adjusted according to the operating power coefficient obtained in H2 to achieve real-time control of the battery temperature:

[0148] P 后 =P 前 *P

[0149] Among them, P 后 is the operating power of the ground source heat pump unit after adjustment; P 前 is the operating power of the ground source heat pump unit before adjustment; P is the operating power coefficient of the ground source heat pump unit.

[0150] Additional explanations are:

[0151] When the circulating water pump is running, wet cleaning is used first, and then dry cleaning is used;

[0152] Among them, wet cleaning uses ethanol solvent;

[0153] Among them, dry cleaning uses blowing and vacuum cleaning.

[0154] Furthermore, it also includes pre-treating the inner wall of the circulating water pump;

[0155] The preprocessing steps are as follows:

[0156] Step 1: Apply Fe3O4 coating to the inner wall of the circulating water pump;

[0157] Step 2: Let it stand for more than 30 minutes until the Fe3O4 coating is firmly bonded to the inner wall of the circulating water pump.

[0158] The coating thickness of Fe3O4 coating is less than 1mm.

[0159] Furthermore, the steps for making the Fe3O4 coating are as follows:

[0160] Step 1: Pour Fe3O4 powder into electrical insulating glue;

[0161] Step 2: Use a glass rod to stir thoroughly to mix the Fe3O4 powder and the electrical insulating glue evenly to ensure that the coating material has uniform magnetostrictive properties;

[0162] Step 3: Apply the mixture evenly on the inner wall of the circulating water pump.

[0163] Furthermore, the diameter of the Fe3O4 powder is 5nm to 50μm.

[0164] Furthermore, the weight ratio of Fe3O4 powder to electrical insulating adhesive is 1:1-3.

[0165] In order to verify the technical effect of the present invention, the following simulation experiment is now carried out:

[0166] Purpose of the experiment: To verify the effectiveness of the heat exchange method of the charging station based on the ground source system in improving heat exchange efficiency, achieving real-time control of battery temperature and reducing energy consumption.

[0167] Test method:

[0168] Two charging stations were selected as test objects, one using a traditional air cooling system (control group) and the other using the heat exchange method based on a ground source system proposed in the present invention (test group).

[0169] Under the same conditions (same charging equipment, battery type, ambient temperature, etc.), the heat dissipation efficiency, battery temperature change, energy consumption and other data of the two groups were recorded separately.

[0170] For the charging stations of the experimental group, the operating parameters of the ground source heat pump unit are adjusted in real time to adapt to changes in battery temperature.

[0171] The two sets of data were compared and analyzed to evaluate the technical effect of the present invention.

[0172] Test data table:

[0173]

[0174] Data Analysis:

[0175] Heat dissipation efficiency: The average heat dissipation efficiency of the test group was 80%, significantly higher than 71.67% of the control group, indicating that the heat exchange method based on the ground source system can dissipate heat more effectively.

[0176] Battery temperature control: The battery termination temperature of the test group was 5°C lower than that of the control group on average, indicating that real-time regulation of the operating parameters of the ground-source heat pump unit can better control the battery temperature.

[0177] Energy consumption: The average energy consumption of the test group was 133.33 kWh, which was lower than that of the control group (154.67 kWh), proving the advantage of the heat exchange method based on the ground source system in energy saving.

[0178] Noise: The noise level of the test group was lower than that of the control group, indicating that the present invention is also helpful in improving the surrounding environment.

[0179] Through the above test data and data analysis, it can be proved that the charging station heat exchange method based on the ground source system of the present invention has excellent technical effects in improving heat dissipation efficiency, realizing real-time control of battery temperature and reducing energy consumption.

[0180] The present invention provides a charging station heat exchange method based on a ground source system, which has the following beneficial effects:

[0181] The present invention adopts a ground source heat pump system as a heat exchange device, utilizing the low-temperature heat energy underground, effectively improving the heat exchange efficiency of the charging station;

[0182] The present invention achieves real-time control of the temperature of the battery of the new energy vehicle by real-time control of the operating parameters of the ground source heat pump unit, thereby ensuring the safe operation of the battery;

[0183] The present invention realizes the recovery and recycling of heat generated by charging piles and new energy vehicles, and reduces the energy consumption of charging stations.

[0184] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0185] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0186] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0187] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A heat exchange method for a charging station based on a ground source system, characterized in that: The steps include: S1: A ground source heat pump system is installed in the charging station, including a ground source heat pump unit, underground pipes, a circulating water pump, a charging pile and a new energy vehicle battery; S2: Extract low-temperature heat energy from underground through the ground-source heat pump unit and transfer the heat energy to the circulating medium; S3: Send the circulating medium into the charging pile through the circulating water pump to provide a constant temperature environment for the new energy vehicle battery; S4: Detect the battery temperature through the temperature detection component of the new energy vehicle battery and transmit the temperature signal to the ground source heat pump unit; S5: According to the battery temperature, adjust the operating parameters of the ground source heat pump unit to achieve real-time control of the battery temperature.

2. The heat exchange method for a charging station based on a ground source system according to claim 1, characterized in that: Also includes: During the charging process, the heat generated by the charging piles and new energy vehicles is recovered through the ground-source heat pump system and transferred to the ground-source heat pump unit; the ground-source heat pump unit stores the recovered heat in the buried pipes to achieve heat recycling.

3. The heat exchange method for a charging station based on a ground source system according to claim 2, characterized in that: According to the battery temperature, the operating parameters of the ground source heat pump unit are adjusted to achieve real-time control of the battery temperature, which specifically includes the following steps: H1: The temperature adjustment unit embedded in the ground source heat pump unit obtains the battery temperature, ground source temperature and preset battery target temperature in real time; H2: Build a feedback control system, input various temperature values ​​and preset parameters, and obtain the operating parameters of the ground source heat pump unit; H3: Adjust the operating parameters according to the operating parameters obtained in H2 to achieve real-time control of battery temperature; The feedback control system constructed is specifically: I(t)=I(t-1)+e(t)△t(cumulative error of integral term) (The differential term represents the rate of change of the error) u(t)=k p e(t)+k i I(t)+k d D(t)(control signal) Q(t)=αu(t)+Q base (Heat exchange provided by ground source heat pump) Where I(t) is the integral function; e(t) is the error signal, e(t) = T b* -T b , T b* is the preset battery target temperature, T b is the battery temperature, T g is the ground source temperature; Q base is the basic heat exchange of the ground source heat pump unit, which is used to maintain the basic temperature level when there is no regulation; α is the conversion coefficient from control signal to heat exchange; k p is the proportional control parameter; k i is the integral control parameter; k d is the differential control parameter; D(t) is the differential term function; u(t) is the control signal function, which is used to adjust the operating parameters of the ground source heat pump unit; Q is the heat exchange amount provided by the ground source heat pump unit.

4. The heat exchange method for a charging station based on a ground source system according to claim 2, characterized in that: According to the battery temperature, the operating parameters of the ground source heat pump unit are adjusted to achieve real-time control of the battery temperature, which specifically includes the following steps: H1: The temperature adjustment unit embedded in the ground source heat pump unit obtains the battery temperature, ground source temperature and preset battery target temperature in real time; H2: Construct the temperature line, obtain the characteristic values ​​of each battery temperature change within the rated time step, simultaneously construct the temperature adjustment model, input the obtained characteristic values ​​of each battery temperature change, and obtain the operating power coefficient of the ground source heat pump unit; H3: Adjust the operating power according to the operating power coefficient obtained in H2 to achieve real-time control of battery temperature; The constructed temperature line to obtain the characteristic values ​​of various battery temperature changes within a rated time step specifically includes the following steps: Q1: Obtain the temperature line within the rated time; Q2: Obtain the variation characteristic value of the temperature line; The temperature adjustment model constructed is specifically: Where P is the operating power coefficient of the ground source heat pump unit; t1 and t n is the ordinate of the temperature value corresponding to each reference point on the rated time temperature line; t n is the battery temperature at the current moment; T g is the ground source temperature; t m is the preset battery target temperature; 1.36 and -0.971 are adjustment constants; dx is the integral operation.

5. The heat exchange method for a charging station based on a ground source system according to claim 4, characterized in that: When adjusting the operating power coefficient obtained in H2 to achieve real-time control of battery temperature: P 后 =P 前 *P Among them, P 后 is the operating power of the ground source heat pump unit after adjustment; P 前 is the operating power of the ground source heat pump unit before adjustment; P is the operating power coefficient of the ground source heat pump unit.

6. The heat exchange method for a charging station based on a ground source system according to claim 5, characterized in that: When the circulating water pump is running, wet cleaning is used first, and then dry cleaning is used; Among them, wet cleaning uses ethanol solvent; Among them, dry cleaning uses blowing and vacuum cleaning.

7. The heat exchange method for a charging station based on a ground source system according to claim 6, characterized in that: It also includes pre-treatment of the inner wall of the circulating water pump; The preprocessing steps are as follows: Step 1: Apply Fe3O4 coating to the inner wall of the circulating water pump; Step 2: Let it stand for more than 30 minutes until the Fe3O4 coating is firmly bonded to the inner wall of the circulating water pump.

8. The heat exchange method for a charging station based on a ground source system according to claim 7, characterized in that: The coating thickness of Fe3O4 coating is less than 1mm.

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