A temperature control system and method for testing new energy batteries

Abstract

The present invention relates to the field of temperature control for testing new energy batteries, and in particular to a temperature control system and method for testing new energy batteries. The contents include: first, initializing the temperature control system for testing new energy batteries, setting the temperature, monitoring the temperature of the coolant of the temperature control system for testing new energy batteries in real time and making a judgment, obtaining a judgment result, performing temperature control analysis and processing according to the judgment result, and obtaining a temperature control operation suggestion; further, adjusting the temperature control based on the temperature control operation suggestion, and protecting and maintaining the temperature control system for testing new energy batteries. The present invention solves the technical problems of low temperature control accuracy and high energy consumption in the process of implementing temperature control for testing new energy batteries.

Description

Technical Field

[0001] The present invention relates to the field of temperature control for testing new energy batteries, and in particular to a temperature control system and method for testing new energy batteries. Background Art

[0002] During the testing of new energy batteries, precise control of temperature is crucial. Traditional temperature control systems mainly rely on compressor refrigeration systems and electric heating equipment to maintain a constant temperature by continuously running compressors and electric heaters. This approach has the following major problems: First, the compressor refrigeration system runs for a long time under high temperature conditions, resulting in high energy consumption, which is not conducive to energy conservation and environmental protection. Secondly, the temperature control accuracy is limited by the response speed of the control system and the real-time performance of data transmission, which makes it difficult to meet the requirements of high-precision temperature control. In addition, delays and losses may occur during data transmission, further affecting the temperature control effect of the system. In the prior art, some solutions attempt to improve the temperature control accuracy by improving control algorithms and sensor technology, but in the case of rapid temperature changes, the response speed of the system still cannot meet the requirements, resulting in a decrease in temperature control accuracy. Especially during the testing of new energy batteries, the temperature changes rapidly and frequently, and traditional control algorithms are difficult to achieve rapid response and high-precision control.

[0003] In summary, the prior art has at least the following technical problems: in the temperature control process for new energy battery testing, the temperature control accuracy is low and the energy consumption is high. Summary of the invention

[0004] The present invention provides a temperature control system and method for testing a new energy battery, so as to solve the technical problems of low temperature control accuracy and high energy consumption in the temperature control process for testing a new energy battery.

[0005] A temperature control system and method for testing new energy batteries of the present invention specifically include the following technical solutions:

[0006] A temperature control method for testing a new energy battery comprises the following steps:

[0007] S1. Initialize the temperature control system for testing new energy batteries, set the temperature, monitor the temperature of the coolant in the temperature control system for testing new energy batteries in real time, make a judgment, obtain the judgment result, perform temperature control analysis and processing according to the judgment result, and obtain temperature control operation suggestions;

[0008] S2. Adjust the temperature control based on the temperature control operation suggestions, and protect and maintain the temperature control system for new energy battery testing.

[0009] Preferably, the S1 specifically includes:

[0010] Temperature setting includes setting the target temperature range according to the test requirements; real-time monitoring of the temperature data of the refrigerant and transmitting the temperature data to the control system; the control system determines whether the current temperature is higher, lower or within the target temperature range based on the set target temperature range; based on the judgment result, the control system decides to start or shut down the corresponding refrigeration system.

[0011] Preferably, the S1 specifically includes:

[0012] In the judgment result, when the current temperature is higher than the target temperature range, a high temperature test is implemented, and the control system shuts down the compressor refrigeration system and starts the cooling water refrigeration system.

[0013] Preferably, the S1 specifically includes:

[0014] A real-time data transmission optimization algorithm is introduced to transmit the real-time collected cooling water flow data and the real-time monitored coolant temperature data to the control system.

[0015] Preferably, the S1 specifically includes:

[0016] In the process of implementing temperature control analysis, the initial parameters of the fuzzy PID control algorithm are set, and the parameters of the fuzzy PID control algorithm are adjusted and saved; the fuzzy logic rules are further set, and a fuzzy rule table is established. The control signal is set according to the combination of temperature error and error change rate; the fuzzy control signal is output through rule reasoning; and the fuzzy control signal is defuzzified to obtain the opening adjustment amount of the electric control valve.

[0017] Preferably, the S1 specifically includes:

[0018] In the process of realizing temperature control analysis, a fast response fuzzy control algorithm is introduced.

[0019] Preferably, the S1 specifically includes:

[0020] In the process of realizing the fast response fuzzy control algorithm, the error change rate is added to the original fuzzy logic rules to optimize the fuzzy rule table.

[0021] Preferably, the S1 specifically includes:

[0022] When the current temperature is lower than the target temperature range in the judgment result, a low temperature test is implemented, the cooling water refrigeration system is turned off, and the compressor refrigeration system is started.

[0023] A temperature control system for testing new energy batteries, comprising the following parts:

[0024] Compressor refrigeration system, refrigerant system, cooling water refrigeration system, control system;

[0025] The compressor refrigeration system includes a compressor, a water-cooled condenser, an expansion valve, a drying filter, a liquid storage tank, a heat exchanger, and high-pressure and low-pressure sensors; the refrigerant passes through the compressor refrigeration cycle to obtain a low-temperature refrigerant;

[0026] The refrigerant system includes an expansion tank, a one-way valve, a heating tube-liquid storage tank, an internal circulation pump, an external circulation pump, a flow meter, a pressure sensor, and a temperature sensor; the refrigerant is circulated to absorb or provide heat to obtain a refrigerant with a constant temperature;

[0027] The refrigerant circulates through the internal circulation pump and the external circulation pump, and uses the heat exchanger to cool or heat, thereby controlling the temperature;

[0028] The cooling water refrigeration system exchanges heat between cooling water and refrigerant; it includes a cooling water solenoid valve, an electric regulating valve and a dual-system heat exchanger;

[0029] The cooling water enters the heat exchanger through the cooling water solenoid valve and the electric regulating valve to exchange heat with the coolant;

[0030] The control system adjusts the flow of cooling water and refrigerant according to the temperature and flow data, maintains the temperature of the temperature control system for new energy battery testing stable, obtains the control signal of the regulating valve, and performs temperature control for new energy battery testing according to the control signal.

[0031] Preferably, the connection between the modules in the temperature control system for new energy battery testing includes:

[0032] The connection between the compressor refrigeration system and the refrigerant system: The compressor refrigeration system provides low-temperature refrigerant, which exchanges heat with the refrigerant in the refrigerant system through the heat exchanger;

[0033] Connection between the refrigerant system and the cooling water refrigeration system: The cooling water refrigeration system exchanges heat with the refrigerant system through a dual-system heat exchanger;

[0034] The connection between the compressor refrigeration system and the cooling water refrigeration system: The cooling water refrigeration system exchanges heat with the compressor refrigeration system through a dual system heat exchanger;

[0035] The connection between the control system and each subsystem: The control system obtains temperature, pressure and flow data through flow meters, pressure sensors and temperature sensors, runs the fuzzy PID algorithm, and adjusts the electric control valves and cooling water solenoid valves in the compressor refrigeration system and the cooling water refrigeration system.

[0036] The beneficial effects of the technical solution of the present invention are:

[0037] 1. Through the fuzzy PID control algorithm and the fast response fuzzy control algorithm, the opening of the electric regulating valve and the refrigerant flow are dynamically adjusted to ensure effective heat exchange between the cooling water and the coolant in the heat exchanger. The internal circulation pump and the external circulation pump work together to maintain the uniformity and stability of the coolant temperature and ensure constant temperature during the battery test.

[0038] 2. Use real-time data transmission optimization algorithm to ensure that the collected data can be accurately and timely transmitted to the control system, avoiding data delay and loss.

[0039] 3. In the case of rapid temperature changes, a fast response fuzzy control algorithm is introduced. By dynamically adjusting the fuzzy logic rules and control signals, the rapid response capability of the temperature control system for new energy battery testing to temperature changes is enhanced. By increasing the weight of the temperature change rate, the fuzzy logic rules are dynamically adjusted to optimize the control signal calculation. The dynamic adjustment factor is introduced and adjusted according to the temperature change rate, which improves the response speed of the temperature control system for new energy battery testing and ensures the temperature control accuracy when the temperature changes.

[0040] 4. During high temperature and low temperature tests, the use of the compressor refrigeration system and the cooling water refrigeration system are dynamically adjusted according to the judgment results to reduce unnecessary energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a structural diagram of a temperature control system for testing new energy batteries according to the present invention;

[0042] Figure 2 This is a flow chart of a temperature control method for testing new energy batteries according to the present invention. DETAILED DESCRIPTION

[0043] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0045] The specific scheme of a temperature control system and method for testing a new energy battery provided by the present invention is described in detail below with reference to the accompanying drawings.

[0046] Refer to the attached Figure 1, which shows a structural diagram of a temperature control system for testing new energy batteries provided by an embodiment of the present invention, the system includes the following parts:

[0047] Compressor refrigeration system, refrigerant system, cooling water refrigeration system, control system;

[0048] Compressor refrigeration system, the refrigerant passes through the compressor refrigeration cycle to reduce the temperature of the coolant inside the heat exchanger to obtain low-temperature refrigerant; including compressor, water-cooled condenser, expansion valve, dry filter, liquid storage tank, heat exchanger (evaporator), high-pressure and low-pressure sensors;

[0049] Compressor: sucks in low-pressure refrigerant vapor and compresses it into high-pressure, high-temperature gas;

[0050] Water-cooled condenser: cools high-temperature and high-pressure refrigerant through cooling water to condense it into high-pressure liquid;

[0051] Expansion valve: expands and reduces the pressure of high-pressure liquid refrigerant, turning it into a low-temperature and low-pressure gas-liquid two-phase mixture;

[0052] Heat exchanger (evaporator): Low-temperature and low-pressure refrigerant absorbs heat in the heat exchanger and evaporates into low-pressure refrigerant vapor;

[0053] Dry filter, liquid storage tank, high pressure and low pressure sensors: assist in controlling and protecting the normal operation of the compressor refrigeration system;

[0054] The refrigerant system, which realizes temperature control by circulating the refrigerant, absorbing or providing heat, and obtaining a refrigerant with a constant temperature; includes an expansion tank, a one-way valve, a heating pipe-liquid storage tank, an internal circulation pump, an external circulation pump, a flow meter, a pressure sensor, and a temperature sensor;

[0055] The refrigerant circulates through the internal circulation pump and the external circulation pump, and uses the heat exchanger to achieve cooling or heating to achieve the purpose of temperature control;

[0056] Expansion tank: stores and regulates the volume change of the coolant;

[0057] One-way valve: controls the flow direction of the coolant;

[0058] Heating pipe-liquid storage tank: The coolant is heated by the heating pipe, and the coolant temperature is balanced by the liquid storage tank;

[0059] Internal circulation pump: pushes the coolant to circulate inside the coolant system;

[0060] External circulation pump: transports the coolant to the client for heat exchange;

[0061] Flow meter, pressure sensor, temperature sensor: monitor and control the flow, pressure and temperature of the coolant;

[0062] The cooling water refrigeration system exchanges heat between cooling water and refrigerant to remove heat and achieve cooling; it includes a cooling water solenoid valve, an electric regulating valve and a dual-system heat exchanger;

[0063] The cooling water enters the heat exchanger through the cooling water solenoid valve and the electric regulating valve, exchanges heat with the coolant to achieve cooling.

[0064] Cooling water solenoid valve: controls the inlet and outlet of cooling water;

[0065] Electric regulating valve: adjust the flow of cooling water to ensure the stability of heat exchange temperature;

[0066] Dual-system heat exchanger: one end is connected to the refrigerant system, and the other end is divided into two independent channel systems, which can be connected to the compressor refrigeration system and the cooling water refrigeration system respectively for heat exchange;

[0067] The control system adjusts the flow of cooling water and refrigerant according to the temperature and flow data, maintains the temperature of the temperature control system for new energy battery testing stable, obtains the control signal of the regulating valve, and realizes the temperature control for new energy battery testing according to the control signal.

[0068] The connection between modules:

[0069] The connection between the compressor refrigeration system and the refrigerant system: The compressor refrigeration system provides low-temperature refrigerant, which exchanges heat with the refrigerant in the refrigerant system through the heat exchanger to reduce the refrigerant temperature;

[0070] The connection between the refrigerant system and the cooling water refrigeration system: The cooling water refrigeration system exchanges heat with the refrigerant system through a dual-system heat exchanger. During high-temperature testing, the cooling water takes away the heat in the refrigerant to cool the refrigerant.

[0071] The connection between the compressor refrigeration system and the cooling water refrigeration system: The cooling water refrigeration system exchanges heat with the compressor refrigeration system through a dual system heat exchanger;

[0072] The connection between the control system and each subsystem: The control system obtains temperature, pressure and flow data through flow meters, pressure sensors and temperature sensors, runs the fuzzy PID algorithm, and adjusts the electric regulating valves and cooling water solenoid valves in the compressor refrigeration system and the cooling water refrigeration system to maintain the temperature stability of the refrigerant system.

[0073] Another embodiment of a temperature control system for testing new energy batteries includes the following contents:

[0074] The various components of the compressor refrigeration system are connected by pipes to form a closed system. The refrigerant circulates in the closed system, constantly changing its state, and exchanges heat with the lubricating oil in the pipe in the evaporator to achieve the purpose of refrigeration. The low-pressure refrigerant vapor generated in the evaporator is first sucked in by the compressor and adiabatically compressed to the condensation pressure, and then enters the water-cooled condenser. It is cooled by the cooling water and condensed into a high-pressure liquid. The high-pressure liquid refrigerant is adiabatically expanded by the expansion valve, and the pressure is reduced to the evaporation pressure. At the same time, the temperature is reduced to the evaporation temperature, and it becomes a gas-liquid two-phase mixture; then it enters the heat exchanger, absorbs the heat of the coolant in the evaporator at a low temperature, and evaporates into vapor, which is sucked into the compressor and starts the cycle again. In the entire refrigeration process, the role of the compressor refrigeration system is to reduce the temperature of the refrigerant inside the heat exchanger.

[0075] The coolant is added to the expansion tank, enters the heating tube-liquid storage tank, is heated by the heating tube, and is transported by the internal circulation pump. It passes through the heat exchanger and the refrigerant or heat in the compressor refrigeration system. The compressor refrigeration system provides the cooling capacity, and then it is heated by the heating tube. The internal circulation reaches a balance, and the liquid storage tank reaches the temperature that needs to be controlled. It is transported to the client through the external circulation pump to absorb the heat continuously generated during the battery charging or discharging test or to provide heat, and to ensure that the temperature and flow of the medium at the outlet of the equipment are constant during the entire test process, and are controlled with high precision to meet the requirements of constant cooling conditions during continuous battery testing.

[0076] The cooling water refrigeration system consists of a cooling water solenoid valve, an electric regulating valve and a dual-system heat exchanger. The cooling water is directly introduced from the cooling water provided to the condenser of the compressor refrigeration system to the heat exchanger. The heat exchanger adopts a dual system, with the refrigerant passing through one end and the other end divided into two independent channel systems, which can be connected to the compressor refrigeration system and the cooling water refrigeration system respectively.

[0077] When the client battery pack requires high temperature (temperature> cooling water temperature + temperature difference 3℃°), the compressor refrigeration system stops working, the electric regulating valve and cooling water solenoid valve are turned on, and the refrigerant is transported by the internal circulation pump, and the heat is exchanged with the water in the cooling water refrigeration system through the heat exchanger. The heat is taken away by the cooling water and then heated by the heating pipe. The internal circulation reaches a balance, and the liquid storage tank reaches the temperature that needs to be controlled, and is transported to the client battery pack through the external circulation pump. The electric regulating valve adopts the fuzzy PID control algorithm to adjust the water inlet flow according to the provided liquid supply temperature, so that the refrigeration capacity obtained by the refrigerant can be accurately adjusted to achieve a higher control accuracy.

[0078] When the client's battery pack requires a low temperature, the coolant is transported by the internal circulation pump and exchanges heat with the refrigerant in the compressor refrigeration system through the heat exchanger. The heat is taken away by the refrigerant in the heat exchanger and then heated by the heating pipe. The temperature reaches equilibrium, and the liquid storage tank reaches the temperature that needs to be controlled, and is transported to the client via the external circulation pump. At this time, the electric regulating valve and the cooling water solenoid valve are closed, and the cooling water in the heat exchanger will be emptied under the action of gravity. This prevents the cooling water on this side from freezing and damaging the heat exchanger when the cooling water refrigeration system is used at low temperatures.

[0079] At medium and high temperatures, the compressor refrigeration system stops and only cooling water is involved in refrigeration and temperature control. This reduces compressor power consumption compared to when the compressor refrigeration system was previously involved. At the same time, the electric heating that counteracts refrigeration does not need to output high power, and the energy consumption of the temperature control system used for new energy battery testing is reduced.

[0080] The lower the cooling water temperature, the lower the lower limit of the temperature at which the cooling water refrigeration system can be used, the more time it can be turned on and used, and the more energy consumption of the entire equipment can be reduced throughout the year.

[0081] Refer to the attached Figure 2 , which shows a flow chart of a temperature control method for testing a new energy battery provided by an embodiment of the present invention, the method comprising the following steps:

[0082] S1. Initialize the temperature control system for testing new energy batteries, set the temperature, monitor the temperature of the coolant in the temperature control system for testing new energy batteries in real time and make a judgment, obtain the judgment result, perform temperature control analysis and processing according to the judgment result, and obtain temperature control operation suggestions;

[0083] The initialization operation of the temperature control system for testing new energy batteries includes checking the power indicator light when the power is on to ensure that the power of the temperature control system for testing new energy batteries is on, and reading the data of each sensor to ensure that the sensor data is normal. If there is any abnormality, professional staff will conduct troubleshooting and repair.

[0084] Temperature setting specifically includes setting the target temperature range according to the test requirements, confirming the set value and saving it, to ensure that the temperature control system for new energy battery testing controls the temperature within the set range.

[0085] Monitor the temperature data of the refrigerant in real time and transmit the temperature data to the control system. The control system determines whether the current temperature is higher, lower or within the target temperature range according to the set target temperature range. Based on the judgment result, the control system decides to start or shut down the corresponding refrigeration system.

[0086] Furthermore, when the current temperature is higher than the set target temperature range in the judgment result, a high temperature test is implemented, the control system shuts down the compressor refrigeration system, starts the cooling water refrigeration system, ensures that the cooling water solenoid valve is fully opened, and the cooling water enters the heat exchanger; the control system collects cooling water flow data in real time through the flow meter sensor installed on the pipe of the heat exchanger.

[0087] In order to ensure the real-time and accuracy of data transmission and avoid data delay and loss, a real-time data transmission optimization algorithm is introduced to improve the reliability of data transmission; the specific implementation process is as follows:

[0088] The collected data is transformed and processed, and the specific implementation formula is as follows:

[0089] ,

[0090] in, Indicates The sensor in Data collected at all times; is the weight matrix; It is the data matrix obtained by collection; through logarithmic transformation, normalization and weighting processing, data redundancy is reduced and transmission is facilitated; Indicates the number of sensors; Indicates the number of time sampling points; is the data matrix after transformation.

[0091] The transformed data matrix is ​​encoded based on the coding matrix using the existing coding technology to improve the anti-interference ability of data transmission; and the encoded data matrix is ​​transmitted to the control system through the existing transmission protocol. After arriving at the control system, the data is decoded by the decoding technology corresponding to the pre-coding technology, and then the decoded data matrix is ​​restored. The recovery formula is as follows:

[0092] ,

[0093] in, is the decoded data matrix; is the decoded The sensor in Data collected at all times; is the data matrix after restoration;

[0094] The above process improves the real-time and accuracy of data transmission and avoids data delay and loss by transforming, encoding, decoding and restoring data.

[0095] The cooling water flow data collected in real time by the flow meter and the coolant temperature data monitored in real time by the temperature sensor are transmitted to the control system through the above-mentioned real-time data transmission optimization algorithm.

[0096] Further set the initial parameters of the fuzzy PID control algorithm. According to the set target temperature range, professional staff will adjust the parameters of the fuzzy PID control algorithm and save the parameter settings to ensure that the control system can be adjusted according to the actual situation; initial parameters such as proportional coefficient, section coefficient, differential coefficient; set fuzzy logic rules according to expert experience, first confirm the fuzzy set, input variables such as current temperature error (the difference between the current temperature and the target temperature), error change rate (the difference between the current temperature error and the temperature error at the previous time point); output variables such as control signals (electric control valve opening); define language variables, such as temperature error: negative large, negative medium, negative small, zero, positive small, positive medium, positive large. Error change rate: negative large, negative medium, negative small, zero, positive small, positive medium, positive large. Control signal: negative large, negative medium, negative small, zero, positive small, positive medium, positive large. Establish a fuzzy rule table and set the corresponding control signal according to the combination of temperature error and error change rate. For example: if the temperature error is negative and the error change rate is negative, the control signal is negative; if the temperature error is zero and the error change rate is zero, the control signal is zero. Use fuzzy reasoning methods (such as Mamdani method) to perform rule reasoning and output fuzzy control signals. Then defuzzify the fuzzy control signal to achieve conversion and obtain the opening adjustment of the electric control valve to ensure that the cooling water flow is appropriate and take away the heat in the coolant.

[0097] In the case of rapid temperature changes, the traditional fuzzy PID algorithm is difficult to respond quickly, resulting in a decrease in temperature control accuracy. The fast response fuzzy control algorithm is introduced. The specific implementation process is as follows:

[0098] Fuzzy logic rule optimization,dynamically adjusts the fuzzy logic rules by increasing the weight of,temperature change rate.

[0099] On the basis of the original fuzzy logic rules, the error change rate is taken into consideration and the fuzzy rule table is optimized.

[0100] Fast response control signal calculation:

[0101] based on Temperature error at all times and error rate of change , use the membership function to calculate the fuzzy membership:

[0102] ,

[0103] in, Indicates the current temperature error and error rate of change Corresponding to The membership degree of the fuzzy logic rules; It is The center of temperature error in the fuzzy logic rule; It is The standard deviation of the temperature error in the fuzzy logic rules; It is The center of the error change rate in the fuzzy logic rules; It is The standard deviation of the error change rate in the fuzzy logic rules;

[0104] Further, based on fuzzy logic rules of fuzzy control and dynamic adjustment, a control signal is calculated;

[0105] ,

[0106] in, It is the preliminary control signal calculated by fuzzy logic rules; It is The weight of the fuzzy logic rules; It is Fuzzy logic rule output; is the number of fuzzy logic rules;

[0107] Furthermore, in order to improve the response speed, a dynamic adjustment factor is introduced , adjusted according to the temperature change rate. Dynamic adjustment formula:

[0108] ,

[0109] in, is the dynamic adjustment factor; is the gain parameter of the adjustment factor;

[0110] Further, quick response to control signals:

[0111] ,

[0112] in, It is a fast response control signal; is the proportionality coefficient; is the integration coefficient; is the differential coefficient;

[0113] Further, adjusting the opening of the electric regulating valve based on the quick response control signal;

[0114] ,

[0115] in, is the current opening of the electric control valve; is the opening of the electric control valve at the previous moment; is the time step;

[0116] Furthermore, the flow meter and temperature sensor are used to continuously monitor the data and feed the data back to the control system to optimize the control parameters: update the proportional coefficient , integral coefficient , differential coefficient :

[0117] ,

[0118] ,

[0119] ,

[0120] in, is the current scale factor; is the proportionality coefficient at the previous moment; is the proportionality factor adjustment factor; is the current integration coefficient; is the integration coefficient of the previous moment; is the integral factor adjustment factor; is the current differential coefficient; is the differential coefficient of the previous moment; is the differential coefficient adjustment factor.

[0121] The above process ensures that the cooling water flow is appropriate. The cooling water and the coolant exchange heat in the heat exchanger to reduce the coolant temperature. The internal circulation pump circulates the cooled coolant back to the liquid storage tank, and heats it appropriately through the heating pipe. The temperature of the liquid storage tank is monitored to ensure that the coolant temperature reaches the set value, that is, a constant temperature coolant is obtained. The external circulation pump transports the constant temperature coolant to the client battery pack to ensure a constant temperature during the test.

[0122] Further, when the current temperature is lower than the set target temperature range in the judgment result, a low temperature test is implemented, the cooling water refrigeration system is shut down, and the compressor refrigeration system is started to ensure that the compressor is started and the refrigerant enters the heat exchanger;

[0123] The control system adjusts the refrigerant flow rate through the fuzzy PID control algorithm; in the specific implementation process, the data input is determined according to the expert experience method, and the data input is the real-time collected temperature data of the refrigerant at the heat exchanger outlet, the pressure of the refrigerant system, and the refrigerant flow rate; and the fuzzy PID control algorithm during the high temperature test is used to adjust the refrigerant flow rate to ensure that the heat in the refrigerant is taken away. The refrigerant and the refrigerant exchange heat in the heat exchanger to reduce the refrigerant temperature. The internal circulation pump circulates the cooled refrigerant back to the liquid storage tank and heats it appropriately through the heating pipe to make the refrigerant temperature reach the set value, that is, to obtain a constant temperature refrigerant. The external circulation pump transports the constant temperature refrigerant to the client battery pack to ensure a constant temperature during the test.

[0124] The temperature control operation recommendations specifically refer to the electric regulating valve opening and refrigerant flow rate.

[0125] S2. Adjust the temperature control based on the temperature control operation suggestions, and protect and maintain the temperature control system for new energy battery testing.

[0126] Based on the temperature control operation suggestions, i.e. the electric regulating valve opening and the refrigerant flow rate, precise adjustments are made to achieve temperature control for new energy battery testing; at the same time, the temperature control system for new energy battery testing is protected and maintained;

[0127] The protection measures for the temperature control system for new energy battery testing include closing the cooling water solenoid valve and the electric regulating valve in sequence under low temperature conditions to prevent the cooling water from freezing. Regularly check the flow and pressure of the cooling water and coolant system to prevent leakage and blockage.

[0128] The maintenance plan for the temperature control system for new energy battery testing specifically includes:

[0129] Daily inspection: Check the operating status of sensors, valves and pumps. Clean the cooling water and coolant inside the temperature control system for new energy battery testing to prevent contamination.

[0130] Regular maintenance:

[0131] Replace aging parts to ensure stable operation of the temperature control system for new energy battery testing.

[0132] Use standard tools and equipment to calibrate sensors and control systems to ensure data accuracy and improve the accuracy of temperature control systems used in new energy battery testing.

[0133] Recording and analysis:

[0134] Establish a maintenance log, record the date, time, operator and maintenance details, and record the content of each maintenance, problems found and treatment results in detail. Form a systematic maintenance file for subsequent reference and analysis.

[0135] Regularly analyze maintenance records and optimize maintenance plans. Summarize common problems, analyze failure causes, and propose improvement measures. Based on the analysis results, optimize maintenance plans to improve the stability and reliability of the temperature control system for new energy battery testing.

[0136] In summary, a temperature control system and method for testing new energy batteries have been completed.

[0137] The order of the embodiments of the invention is for description only and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0138] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0139] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A temperature control system for testing new energy batteries, characterized in that: Includes the following parts: Compressor refrigeration system, refrigerant system, cooling water refrigeration system, control system; Compressor refrigeration system, including compressor, water-cooled condenser, expansion valve, filter drier, liquid storage tank, heat exchanger, high-pressure and low-pressure sensors; The refrigerant is refrigerated by the compressor to obtain low-temperature refrigerant; The refrigerant system includes an expansion tank, a one-way valve, a heating tube-liquid storage tank, an internal circulation pump, an external circulation pump, a flow meter, a pressure sensor, and a temperature sensor; the refrigerant is circulated to absorb or provide heat to obtain a refrigerant with a constant temperature; The refrigerant circulates through the internal circulation pump and the external circulation pump, and uses the heat exchanger to cool or heat, thereby controlling the temperature; The cooling water refrigeration system exchanges heat between cooling water and refrigerant; it includes a cooling water solenoid valve, an electric regulating valve and a dual-system heat exchanger; The cooling water enters the heat exchanger through the cooling water solenoid valve and the electric regulating valve to exchange heat with the coolant; The control system adjusts the flow of cooling water and refrigerant according to the temperature and flow data, maintains the temperature of the temperature control system for new energy battery testing stable, obtains the control signal of the regulating valve, and performs temperature control for new energy battery testing according to the control signal; The connection between the compressor refrigeration system and the refrigerant system: The compressor refrigeration system provides low-temperature refrigerant, which exchanges heat with the refrigerant in the refrigerant system through the heat exchanger; Connection between the refrigerant system and the cooling water refrigeration system: The cooling water refrigeration system exchanges heat with the refrigerant system through a dual-system heat exchanger; The connection between the compressor refrigeration system and the cooling water refrigeration system: The cooling water refrigeration system exchanges heat with the compressor refrigeration system through a dual system heat exchanger; Connection between the control system and each subsystem: The control system obtains temperature, pressure and flow data through flow meters, pressure sensors and temperature sensors, runs fuzzy PID algorithm, and adjusts the electric regulating valve and cooling water solenoid valve in the compressor refrigeration system and cooling water refrigeration system; A temperature control method for a temperature control system for testing a new energy battery comprises the following steps: S1. Initialize the temperature control system for testing new energy batteries and set the temperature. Monitor the temperature of the coolant in the temperature control system for testing new energy batteries in real time and make a judgment to obtain a judgment result. In the judgment result, when the current temperature is higher than the target temperature range, implement a high temperature test, and control the system to shut down the compressor refrigeration system and start the cooling water refrigeration system. Perform temperature control analysis and processing based on the judgment result to obtain temperature control operation suggestions. S2. Adjust the temperature control based on the temperature control operation suggestions, and protect and maintain the temperature control system for new energy battery testing.

2. The temperature control system for testing new energy batteries according to claim 1, characterized in that: Specifically include: Temperature setting includes setting the target temperature range according to the test requirements; real-time monitoring of the temperature data of the coolant and transmitting the temperature data to the control system; The control system determines whether the current temperature is higher, lower or within the target temperature range according to the set target temperature range; based on the judgment result, the control system decides to start or shut down the corresponding refrigeration system.

3. The temperature control system for testing new energy batteries according to claim 1, characterized in that: Specifically include: A real-time data transmission optimization algorithm is introduced to transmit the real-time collected cooling water flow data and the real-time monitored coolant temperature data to the control system.

4. The temperature control system for testing new energy batteries according to claim 1, characterized in that: Specifically include: In the process of implementing temperature control analysis, the initial parameters of the fuzzy PID control algorithm are set, and the parameters of the fuzzy PID control algorithm are adjusted and saved; the fuzzy logic rules are further set, and a fuzzy rule table is established. The control signal is set according to the combination of temperature error and error change rate; the fuzzy control signal is output through rule reasoning; and the fuzzy control signal is defuzzified to obtain the opening adjustment amount of the electric control valve.

5. The temperature control system for testing new energy batteries according to claim 1, characterized in that: Specifically include: In the process of realizing temperature control analysis, a fast response fuzzy control algorithm is introduced.

6. The temperature control system for testing new energy batteries according to claim 1, characterized in that: Specifically include: In the process of realizing the fast response fuzzy control algorithm, the error change rate is added to the original fuzzy logic rules to optimize the fuzzy rule table.

7. The temperature control system for testing new energy batteries according to claim 1, characterized in that: Specifically include: When the current temperature is lower than the target temperature range in the judgment result, a low temperature test is implemented, the cooling water refrigeration system is turned off, and the compressor refrigeration system is started.

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