A comprehensive thermal management system and method for testing new energy lithium batteries

Abstract

The present invention relates to the field of lithium battery testing, and in particular to a comprehensive thermal management system and method for testing new energy lithium batteries. It includes: setting a target temperature range, obtaining the temperature inside the thermostat and the external environment temperature, determining to start the heating or cooling mode, and maintaining a constant temperature environment; in a constant temperature environment, switching the direct cooling and direct heating modes based on the battery's charge and discharge status, real-time temperature, and target temperature range, obtaining adjusted parameter points, and optimizing and adjusting to obtain adjustment signals and optimized parameter points; adjusting the working state according to the adjustment signals and optimized parameter points; obtaining and identifying and analyzing the energy consumption data of each system module during the testing of new energy lithium batteries; proposing suggestions for optimizing energy efficiency based on the analysis results; obtaining the operating status data of each system module, and performing detection. It solves the technical problems of low flexibility, high energy consumption, and poor intelligence in comprehensive thermal management for testing new energy lithium batteries.

Description

Technical Field

[0001] The present invention relates to the field of lithium battery testing, and in particular to a comprehensive thermal management system and method for testing new energy lithium batteries. Background Art

[0002] With the adjustment of global energy structure and the improvement of environmental protection requirements, new energy vehicles have been widely used and developed rapidly as a substitute for traditional fuel vehicles. As the core component of new energy vehicles, the performance and safety of lithium batteries directly affect the overall performance and service life of the vehicle. In the research and development and production process of lithium batteries, it is particularly important to conduct comprehensive testing and evaluation on them. However, lithium batteries will generate a lot of heat during the charging and discharging test. If this heat cannot be managed in a timely and effective manner, it will not only affect the test results of the battery, but also may cause safety hazards.

[0003] At present, traditional thermal management systems have many shortcomings in practical applications. First, the constant temperature and environmental control system is unreliable and it is difficult to accurately control the temperature of the test environment, resulting in an uneven temperature field, which affects the accuracy of the test results. Secondly, the existing refrigeration constant temperature cooling system consumes a lot of energy and has low control accuracy, and cannot effectively cope with the heat changes of lithium batteries under different charging and discharging conditions. In addition, there is a lack of effective linkage between the battery charging and discharging system and the environmental control and cooling system, making it difficult to achieve unified management and optimization of the energy consumption of each system during the test process.

[0004] In summary, the above technology has at least the following technical problems: when using comprehensive thermal management for testing new energy lithium batteries, it has technical problems such as low flexibility, high energy consumption and poor intelligence. Summary of the invention

[0005] The present invention provides a comprehensive thermal management system and method for testing new energy lithium batteries, so as to solve the technical problems of low flexibility, high energy consumption and poor intelligence in comprehensive thermal management for testing new energy lithium batteries.

[0006] The present invention provides a comprehensive thermal management system and method for testing new energy lithium batteries, which specifically includes the following technical solutions:

[0007] A comprehensive thermal management method for testing new energy lithium batteries, comprising the following steps:

[0008] S1. Set the target temperature range, monitor the temperature inside the thermostat, obtain the ambient temperature outside the thermostat, determine whether to start the heating or cooling mode, and maintain a constant temperature environment; in a constant temperature environment, switch the direct cooling and direct heating mode based on the charge and discharge status of the new energy lithium battery, the real-time temperature, and the set target temperature range, and obtain the adjusted parameter point;

[0009] S2. Based on the adjusted parameter points, real-time temperature data in a constant temperature environment, and temperature requirements at different stages during the lithium battery test, multi-target tracking variable frequency control technology is used to optimize and adjust, obtain adjustment signals and optimized parameter points, and adjust the working state according to the adjustment signals and optimized parameter points;

[0010] S3. During the new energy lithium battery test, obtain, identify and analyze the energy consumption data of each system module in the integrated thermal management system for new energy lithium battery testing; based on the analysis results, propose suggestions for optimizing energy efficiency; at the same time, obtain the operating status data of each system module, and set safety thresholds for real-time detection, and provide real-time alarms when abnormalities are detected.

[0011] Preferably, the S1 specifically includes:

[0012] When the temperature inside the constant temperature box is lower than the set target temperature range, the heating mode is started; when the temperature inside the constant temperature box reaches the set target temperature range, the electric heating tube and the fan stop heating, and the integrated thermal management system for new energy lithium battery testing enters the constant temperature mode; when the temperature inside the constant temperature box is higher than the set target temperature range, the cooling mode is started.

[0013] Preferably, the S1 specifically includes:

[0014] In a constant temperature environment, the switching options for direct cooling and direct heating modes are as follows:

[0015] When the battery pack is charging or discharging and the real-time temperature is higher than the set temperature range, select the direct cooling mode; when the battery pack is charging or discharging and the real-time temperature is lower than the set temperature range, select the direct heating mode; when the battery pack is in standby mode and the real-time temperature is higher than the set temperature range, select the direct cooling mode; when the battery pack is in standby mode and the real-time temperature is lower than the set temperature range, select the direct heating mode.

[0016] Preferably, the S2 specifically includes:

[0017] The multi-target tracking variable frequency control technology is introduced to dynamically adjust the frequency and power of the compressor and electric heater. The specific implementation is as follows:

[0018] Calculate the regulation signal and use it as input to adjust the compressor frequency and electric heater power; and optimize the parameter points through actual operation data and feedback mechanism.

[0019] Preferably, the S2 specifically includes:

[0020] During the compressor frequency adjustment process, an adaptive time-weighted average control algorithm is introduced to dynamically adjust the compressor frequency according to the weighted average value of historical compressor frequency data.

[0021] Preferably, the S2 specifically includes:

[0022] In the process of adjusting the power of the electric heater, a dynamic damping adjustment algorithm is introduced.

[0023] A comprehensive thermal management system for testing new energy lithium batteries, which is applied to the above-mentioned comprehensive thermal management method for testing new energy lithium batteries, includes the following parts:

[0024] Constant temperature environment control system, refrigerant direct cooling and heating system, multi-target tracking frequency conversion control system, energy consumption monitoring system, safety protection system;

[0025] The constant temperature environment control system includes a constant temperature box, a refrigeration system, a second compressor, a second condenser, a second electronic expansion valve, a second evaporator, an electric heating pipe and a fan. The second compressor is connected to the second condenser, and then flows into the second electronic expansion valve, and then connected to the second evaporator, and then returns to the second compressor. There is a fan behind the electric heating pipe, which provides constant temperature control signals and actual temperature data for the multi-target tracking frequency conversion control system and the refrigerant direct cooling and direct heating system;

[0026] The refrigerant direct cooling and direct heating system switches between direct cooling and direct heating modes according to the charge and discharge status of the battery pack, the real-time temperature and the set target temperature; direct cooling mode: the first compressor, the first condenser, the first subcooler, the first electronic expansion valve, the first evaporator, the first pressure regulating valve and the regenerator; direct heating mode: the first compressor, the first bypass valve No. 1, the first subcooler, the first bypass valve No. 2, the first direct heating electronic expansion valve, the first regenerator, providing adjusted parameter points for the multi-target tracking variable frequency control system;

[0027] The multi-target tracking frequency conversion control system is based on the constant temperature environment control system and the refrigerant direct cooling and heating system. It adjusts the frequency parameter points of the electric heating and refrigeration compressors through the multi-target tracking frequency conversion control technology, and transmits the frequency adjustment signals of the compressor and the electric heating pipe and the adjusted temperature data back to the constant temperature environment control system and the refrigerant direct cooling and heating system;

[0028] The energy consumption monitoring system monitors the energy consumption of each system module of the integrated thermal management system for new energy lithium battery testing based on the current and power data of the constant temperature environment control system, the refrigerant direct cooling and heating system, and other electrical components;

[0029] The safety protection system obtains the operating status data of each system module in the integrated thermal management system for testing new energy lithium batteries, and performs real-time detection based on the acquired operating status data to detect safety hazards and provide real-time alarm information.

[0030] The beneficial effects of the technical solution of the present invention are:

[0031] 1. Through the combination of constant temperature environmental control system and refrigerant direct cooling and heating system, the test environment temperature can be accurately controlled to ensure that the lithium battery works within the optimal temperature range. The multi-target tracking frequency conversion control technology is adopted to achieve rapid response and stable control of temperature.

[0032] 2. Introduce adaptive time-weighted average control algorithm and dynamic damping adjustment algorithm to improve the response speed and stability of compressor frequency and electric heater power adjustment, and avoid temperature control lag and power adjustment overshoot.

[0033] 3. Based on real-time temperature data and adjusted parameter points, the multi-target tracking frequency conversion control system can accurately control the operating status of the comprehensive thermal management system for new energy lithium battery testing, ensuring the temperature requirements of the comprehensive thermal management system for new energy lithium battery testing at different test stages. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural diagram of a comprehensive thermal management system for testing new energy lithium batteries according to the present invention;

[0035] Figure 2 This is a flow chart of a comprehensive thermal management method for testing new energy lithium batteries described in the present invention. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] The specific scheme of a comprehensive thermal management system and method for testing new energy lithium batteries provided by the present invention is described in detail below with reference to the accompanying drawings.

[0039] Refer to the attached Figure 1 , which shows a structural diagram of a comprehensive thermal management system for testing new energy lithium batteries provided by an embodiment of the present invention, the system includes the following parts:

[0040] Constant temperature environment control system, refrigerant direct cooling and heating system, multi-target tracking frequency conversion control system, energy consumption monitoring system, safety protection system;

[0041] The constant temperature environment control system includes a constant temperature box, a refrigeration system, a second compressor, a second condenser, a second electronic expansion valve, a second evaporator, an electric heating pipe and a fan. The second compressor is connected to the second condenser, then flows into the second electronic expansion valve, then connected to the second evaporator, and then returns to the second compressor. There is a fan behind the electric heating pipe to provide constant temperature control signals and actual temperature data for the multi-target tracking frequency conversion control system and the refrigerant direct cooling and direct heating system;

[0042] The constant temperature box provides a closed test environment. and smoke alarm to adjust and maintain the temperature in the thermostatic chamber. During the thermostatic chamber test, when the set temperature is higher than the ambient temperature, the electric heating tube starts the heating mode. When the set temperature is lower than the ambient temperature, the refrigeration system starts the cooling and cooling mode. When the set temperature is reached, the refrigeration and heating tubes work at the same time to achieve energy-saving operation and control the temperature within the preset range. The refrigeration system adopts frequency conversion control to save operating power consumption.

[0043] The refrigerant direct cooling and direct heating system can flexibly switch between direct cooling and direct heating modes according to the charge and discharge status of the battery pack, the real-time temperature and the set target temperature; direct cooling mode: the first compressor, the first condenser, the first subcooler, the first electronic expansion valve, the first evaporator, the first pressure regulating valve and the regenerator; direct heating mode: the first compressor, the first bypass valve No. 1, the first subcooler, the first bypass valve No. 2, the first direct heating electronic expansion valve, the first regenerator, providing adjusted parameter points such as temperature and pressure for the multi-target tracking variable frequency control system;

[0044] In direct cooling mode: the first compressor is connected to the first condenser, then passes through the first subcooler, then flows into the first electronic expansion valve, then connected to the first evaporator, and then passes through the first pressure regulating valve and the regenerator before returning to the first compressor; the first condenser fan controls the condensing pressure, the first subcooler fan controls the subcooling degree, the cold plate outlet pressure is controlled by the first pressure regulating valve, and the cold plate outlet superheat degree is controlled by the first electronic expansion valve; in direct heating mode: the first compressor is connected to the No. 1 first bypass valve, then passes through the first subcooler, then passes through the No. 2 first bypass valve, passes through the subcooling plate, and then connects to the first direct heating electronic expansion valve, then passes through the first regenerator and returns to the first compressor; the first subcooler fan controls the battery pack inlet superheat degree, the No. 2 first bypass valve controls the battery pack inlet pressure, and the first direct heating electronic expansion valve controls the battery pack outlet superheat degree;

[0045] The multi-target tracking frequency conversion control system is based on the constant temperature environment control system and the refrigerant direct cooling and heating system. It adjusts the parameter points such as the frequency of the electric heating and refrigeration compressors through the multi-target tracking frequency conversion control technology to ensure the precise control of the parameter points such as condensing pressure, subcooling, cold plate outlet pressure and superheating, and achieves rapid temperature response and stability. The frequency adjustment signal of the compressor and the electric heating pipe and the adjusted temperature data are transmitted back to the constant temperature environment control system and the refrigerant direct cooling and heating system to adjust the working state and ensure the stable operation of the comprehensive thermal management system for new energy lithium battery testing.

[0046] The energy consumption monitoring system monitors the energy consumption of each system module of the comprehensive thermal management system for new energy lithium battery testing based on the current and power data of the constant temperature environment control system, the refrigerant direct cooling and heating system, and other electrical components, and provides users with detailed energy consumption management information to help users manage energy consumption;

[0047] Safety protection system, obtain the operating status data of each system module in the comprehensive thermal management system for new energy lithium battery testing, temperature sensor data, and smoke alarm data, and conduct real-time detection based on the acquired data to detect safety hazards such as abnormal temperature and provide real-time alarm information.

[0048] Refer to the attached Figure 2 , which shows a flow chart of a comprehensive thermal management method for testing a new energy lithium battery provided by an embodiment of the present invention, the method comprising the following steps:

[0049] S1. Set the target temperature range, monitor the temperature inside the thermostat, obtain the ambient temperature outside the thermostat, determine whether to start the heating or cooling mode, and maintain a constant temperature environment; in a constant temperature environment, switch the direct cooling and direct heating mode based on the charge and discharge status of the new energy lithium battery, the real-time temperature, and the set target temperature range, and obtain the adjusted parameter point;

[0050] The user sets the target temperature range according to the test requirements, and the temperature sensor monitors the current temperature inside the thermostatic chamber in real time, and obtains the ambient temperature outside the thermostatic chamber to determine whether to start the heating or cooling mode; when the temperature inside the thermostatic chamber is lower than the set target temperature range, the heating mode is started, the electric heating tube is started, and heating begins. At the same time, the fan is started to evenly distribute heat, so that the temperature inside the thermostatic chamber gradually rises. The temperature sensor monitors the temperature inside the thermostatic chamber in real time to ensure that the temperature rises evenly; when the temperature inside the thermostatic chamber reaches the set target temperature range, the electric heating tube and the fan stop heating, and the new energy lithium battery test The integrated thermal management system is used to enter the constant temperature mode. When the temperature inside the thermostatic box is higher than the set target temperature range, the refrigeration mode is started, and the second compressor compresses the refrigerant into high-pressure and high-temperature gas, which is then cooled by the second condenser and becomes a high-pressure and normal-temperature liquid. It is throttled and expanded by the second electronic expansion valve and becomes a low-pressure and low-temperature liquid. It then passes through the second evaporator and absorbs heat before becoming a low-pressure and normal-temperature gas and returns to the compressor. The temperature sensor monitors the temperature inside the thermostatic box in real time to ensure that the temperature drops evenly. When the temperature inside the thermostatic box reaches the set target temperature range, the refrigeration is stopped, and the integrated thermal management system for new energy lithium battery testing enters the constant temperature mode.

[0051] When the temperature inside the thermostatic box reaches the set target temperature range, the refrigeration and heating pipes work simultaneously to ensure that the temperature is stable within the set target temperature range; the temperature sensor monitors the temperature inside the thermostatic box in real time, and dynamically adjusts the working status of refrigeration and heating based on the feedback of the multi-target tracking frequency conversion control system, and avoids temperature fluctuations and maintains a constant temperature by precisely controlling the constant temperature environmental control system.

[0052] In a constant temperature environment, the direct cooling and direct heating modes can be flexibly switched based on the charge and discharge status of the new energy lithium battery, the real-time temperature and the set target temperature range; the charge and discharge status of the new energy lithium battery is specifically as follows:

[0053] Charging state: When the lithium battery pack is in the charging state, it will generate more heat, which needs to be quickly dissipated through the direct cooling mode to ensure that the lithium battery works within the safe temperature range; Discharging state: During the discharge process, the lithium battery will also generate heat, and the direct cooling mode is also applicable; Standby state: When the lithium battery is in the standby state, decide whether to switch to the direct heating mode according to the ambient temperature and the set temperature to maintain the working temperature of the lithium battery. If the battery pack is charging or discharging, and the real-time temperature is higher than the set temperature range, select the direct cooling mode; if the battery pack is charging or discharging, and the real-time temperature is lower than the set temperature range, select the direct heating mode. If the battery pack is in the standby state, and the real-time temperature is higher than the set temperature range, select the direct cooling mode; if the battery pack is in the standby state, and the real-time temperature is lower than the set temperature range, select the direct heating mode.

[0054] For the direct cooling mode, the first compressor is started, and the first compressor compresses the refrigerant into high-pressure and high-temperature gas, and the refrigeration cycle begins. The refrigerant is cooled by the first condenser, and the high-pressure and high-temperature gas refrigerant passes through the first condenser and is condensed into a high-pressure and normal-temperature liquid. The first subcooler further reduces the temperature, and the high-pressure and normal-temperature liquid refrigerant passes through the first subcooler, and the temperature is further reduced to form a high-pressure and low-temperature liquid. The first electronic expansion valve throttles and expands, and the high-pressure and low-temperature liquid refrigerant passes through the first electronic expansion valve throttles and expands to become a low-pressure and low-temperature liquid. The first evaporator exchanges heat and absorbs heat, and the low-pressure and low-temperature liquid refrigerant enters the first evaporator, exchanges heat with the external heat source, absorbs heat and becomes a low-pressure and normal-temperature gas. The first pressure regulating valve and the regenerator return to the first compressor after adjustment, and the low-pressure and normal-temperature gas refrigerant passes through the first pressure regulating valve and the regenerator, adjusts the pressure and recovers part of the heat, and then returns to the first compressor to complete a cycle. In the direct cooling mode, the first condenser fan: controls the condensing pressure to ensure that the pressure in the condenser is stable within the set range. The first subcooler fan: controls the subcooling degree to ensure that the temperature of the refrigerant reaches the optimal state before entering the first electronic expansion valve. The first pressure regulating valve: controls the outlet pressure of the cold plate to ensure that the pressure is within the set range. The first electronic expansion valve: controls the outlet superheat of the cold plate to ensure that the outlet superheat is within the set range.

[0055] For direct heating mode, start the first compressor, which compresses the refrigerant into high-pressure and high-temperature gas to start the heating cycle. The refrigerant enters the first subcooler through the first bypass valve No. 1, and the high-pressure and high-temperature gas refrigerant passes through the first bypass valve No. 1 and directly enters the first subcooler. After passing through the first bypass valve No. 2 and the cold plate, the refrigerant passes through the first bypass valve No. 2 and the cold plate, exchanges heat with the cold plate, releases heat, and reduces the temperature. It returns to the first compressor through the first direct heating electronic expansion valve and the regenerator, and the refrigerant expands through the throttling of the first direct heating electronic expansion valve, and then passes through the regenerator to recover part of the heat before returning to the first compressor to complete a cycle. In the direct heating mode, the first subcooler fan: controls the superheat of the battery pack inlet to ensure that the refrigerant temperature before entering the battery pack is moderate. The second first bypass valve: controls the inlet pressure of the battery pack to ensure that the pressure is within the set range. The first electronic expansion valve: controls the outlet superheat of the battery pack to ensure that the outlet superheat is within the set range.

[0056] The adjusted parameter points are obtained through the above process, and the adjusted parameter points include temperature and pressure parameter points. The adjusted parameter points are transmitted to the multi-target tracking frequency conversion control system. Through the adjusted temperature and pressure data, the multi-target tracking frequency conversion control system can accurately control the operating state of the comprehensive thermal management system for new energy lithium battery testing to ensure stable and efficient operation of the system.

[0057] S2. Based on the adjusted parameter points, real-time temperature data in a constant temperature environment, and temperature requirements at different stages during the lithium battery test, multi-target tracking variable frequency control technology is used to optimize and adjust, obtain adjustment signals and optimized parameter points, and adjust the working state according to the adjustment signals and optimized parameter points;

[0058] Based on the adjusted parameter points, real-time temperature data in a constant temperature environment, and the temperature requirements at different stages during the lithium battery test, the multi-target tracking variable frequency control technology is used to dynamically adjust the frequency and power of the compressor and electric heater to ensure the temperature requirements at different test stages. The specific implementation formula is as follows:

[0059] ,

[0060] in, yes time The regulating signal output by the controller is used to adjust the frequency and power of the compressor and the electric heater; is the proportional gain coefficient, which determines the influence of the current error on the regulation signal; is the integral gain coefficient, which determines the impact of the accumulated error on the regulation signal; is the differential gain coefficient, which determines the effect of the error change rate on the regulation signal; is the coefficient of the proportional enhancement term, which enhances the nonlinear effect of the error on the regulated signal; is the coefficient of the differential enhancement term, which enhances the nonlinear effect of the error change rate on the regulation signal; is the current error, i.e. the difference between the set temperature and the actual temperature; is the integral of the error, used to accumulate the effect of the error; It is the derivative of the error and is used to reflect the rate of change of the error.

[0061] The regulated signal As input, the compressor frequency and the electric heater power are regulated:

[0062] ,

[0063] ,

[0064] in, It is the variable frequency of the compressor, which is used to control the flow rate of the refrigerant; is the base frequency of the compressor; is the frequency regulation coefficient, which determines the effect of the regulation signal on the compressor frequency; is the power of the electric heater, which is used to control the amount of heating; is the base power of the electric heater; is the power regulation coefficient, which determines the effect of the regulation signal on the power of the electric heater; It is a logarithmic transformation of the regulation signal, which is used to increase the nonlinear regulation effect. It is an exponential transformation of the regulation signal, which is used to enhance the regulation effect.

[0065] Optimize refrigerant temperature and pressure through actual operating data and feedback mechanism:

[0066] ,

[0067] ,

[0068] in, It is the optimized refrigerant temperature, which is used to adjust the cooling effect; It is the real-time temperature data in the thermostat; It is the temperature correction value, which is used to adjust the temperature according to actual needs; is a sine function, used to simulate temperature fluctuations; It is the optimized refrigerant pressure, which is used to adjust the refrigerant state; is the base pressure of the refrigerant; It is the pressure correction value, which is used to adjust the pressure according to actual needs; is the cosine function, used to simulate pressure fluctuations; is the frequency parameter, which determines the frequency of temperature and pressure fluctuations; Indicates time.

[0069] According to the adjustment signal With optimized refrigerant temperature and pressure , , adjust the working status of each system module in the comprehensive thermal management system for new energy lithium battery testing. Specifically, the frequency of the compressor and electric heater is adjusted to ensure precise control of temperature and pressure.

[0070] In order to avoid the problem of slow response time during compressor frequency adjustment, which leads to temperature control lag, the adaptive time weighted average control algorithm is introduced to solve the problem of slow response time of compressor frequency adjustment. The adaptive time weighted average control algorithm dynamically adjusts the compressor frequency according to the weighted average value of historical compressor frequency data. The specific implementation formula is as follows:

[0071] ,

[0072] in, is the adjusted compressor frequency; It is The compressor frequency in time steps; is the time weighting coefficient, using the exponential weighting function to allocate time weight; is a time constant, which determines the time range of weighting; is the window length of historical compressor frequency data, reflecting the degree of reliance on past behavior when making frequency adjustments.

[0073] In order to avoid the problem of unstable temperature control caused by overshoot during the power adjustment of the electric heater, a dynamic damping adjustment algorithm is introduced to avoid the problem of overshoot in the power adjustment of the electric heater; the dynamic damping adjustment algorithm introduces a damping factor during the adjustment process to reduce overshoot; the specific implementation formula is as follows:

[0074] ,

[0075] ,

[0076] in, is the adjusted electric heater power; is the initially calculated electric heater power; is the damping coefficient, which determines the strength of damping; is the adjustment coefficient, which determines the rate of change of the damping factor; is the current error, i.e. the difference between the set temperature and the actual temperature; is the additional adjustment coefficient, which determines the weight of the additional adjustment item; is the number of historical error data points; It is The error in time steps; The influence of historical error data has been increased, and the stability and response speed of the integrated thermal management system for new energy lithium battery testing have been improved.

[0077] S3. During the new energy lithium battery testing process, obtain, identify and analyze the energy consumption data of each system module in the integrated thermal management system for new energy lithium battery testing; based on the analysis results, put forward suggestions for optimizing energy efficiency; at the same time, obtain the operating status data of each system module, and set safety thresholds for real-time detection, and provide real-time alarms when abnormalities are detected.

[0078] During the new energy lithium battery testing process, energy consumption data such as voltage and current are obtained through sensors installed in each system module. Data mining technology is used to identify and analyze the energy consumption data to obtain analysis results, identify peak and valley periods of energy consumption, and analyze the energy consumption characteristics and usage patterns of each system module. Energy consumption data under different test conditions and operating modes are compared to evaluate system energy efficiency. Based on the analysis results, professional and technical personnel will put forward suggestions for optimizing energy efficiency, such as adjusting test time, improving operating procedures, and optimizing equipment operating parameters; by adjusting the working mode and load distribution of each system, unnecessary energy consumption can be reduced and overall energy efficiency can be improved. Data mining technology is a technical means well known to those skilled in the art and will not be elaborated here.

[0079] At the same time, it continuously obtains the operating status data of each system module in the comprehensive thermal management system for new energy lithium battery testing, temperature sensor data, and smoke alarm data, and uses a data analysis algorithm, such as a sliding window analysis algorithm, to perform real-time analysis on the acquired data, calculate statistical parameters of temperature, CO2 concentration and smoke concentration, such as mean and variance, and set multiple safety thresholds (such as temperature upper limit, CO2 concentration upper limit, smoke detection sensitivity, etc.) according to historical operation status data and experimental results. Once the detection data exceeds the preset safety threshold, it will be determined as an abnormal situation; when an abnormal situation is detected, a real-time alarm will be immediately issued, and emergency treatment will be performed for the abnormality; such as overheat protection, when an abnormal temperature rise is detected, the overheat protection mechanism will be immediately triggered, the electric heating pipe will be turned off and the workload of the refrigeration system will be increased, the temperature will be quickly reduced, and the battery charging and discharging process will be stopped to prevent further temperature rise. Short-circuit protection, when abnormal current or voltage fluctuations are detected, the short-circuit protection mechanism will be triggered to cut off the power supply to prevent short circuits or fires caused by electrical faults. The data analysis algorithms used above are technical means well known to those skilled in the art and will not be described in detail here.

[0080] In summary, a comprehensive thermal management system and method for testing new energy lithium batteries has been completed.

[0081] 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.

[0082] 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.

[0083] 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 comprehensive thermal management method for testing new energy lithium batteries, characterized in that: The following steps are involved: S1. Set the target temperature range, monitor the temperature inside the thermostat, obtain the ambient temperature outside the thermostat, and start the heating or cooling mode to maintain a constant temperature environment. In the constant temperature environment, switch the direct cooling and direct heating mode based on the charge and discharge status of the new energy lithium battery, the real-time temperature and the set target temperature range to obtain the adjusted parameter point. S2. Based on the adjusted parameter points, real-time temperature data in a constant temperature environment, and temperature requirements at different stages during the lithium battery test, multi-target tracking variable frequency control technology is used for optimization and adjustment to dynamically adjust the frequency and power of the compressor and electric heater. The specific implementation is as follows: ， in, yes time The regulating signal output by the controller; is the proportional gain coefficient; is the integral gain coefficient; is the differential gain coefficient; is the coefficient of proportional enhancement term; is the coefficient of the differential enhancement term; is the current error, i.e. the difference between the set temperature and the actual temperature; is the integral of the error; is the derivative of the error; The regulated signal As input, the compressor frequency and the electric heater power are regulated: ， ， in, is the variable frequency of the compressor; is the base frequency of the compressor; is the frequency adjustment coefficient; is the power of the electric heater; is the base power of the electric heater; is the power regulation factor; is the logarithmic transform of the conditioning signal; is the exponential transformation of the conditioning signal; And optimize refrigerant temperature and pressure through actual operating data and feedback mechanism: ， ， in, is the optimized refrigerant temperature; It is the real-time temperature data in the thermostat; is the temperature correction value; is a sine function; is the optimized refrigerant pressure; is the base pressure of the refrigerant; is the pressure correction value; is the cosine function; is the frequency parameter; Indicates time; According to the adjustment signal With optimized refrigerant temperature and pressure , , adjust the compressor frequency and electric heater power; in the process of compressor frequency adjustment, an adaptive time weighted average control algorithm is introduced to dynamically adjust the compressor frequency according to the weighted average of historical compressor frequency data. The specific implementation formula is as follows: ， in, is the adjusted compressor frequency; It is The compressor frequency in time steps; is the time weighting coefficient; is the time constant; is the window length of historical compressor frequency data; In the process of adjusting the power of the electric heater, a dynamic damping adjustment algorithm is introduced. The specific implementation formula is as follows: ， ， in, is the adjusted electric heater power; is the initially calculated electric heater power; is the damping coefficient; is the adjustment coefficient; is the current error, i.e. the difference between the set temperature and the actual temperature; is the additional adjustment coefficient; is the number of historical error data points; It is The error in time steps; S3. During the new energy lithium battery test, obtain, identify and analyze the energy consumption data of each system module in the integrated thermal management system for new energy lithium battery testing; based on the analysis results, propose suggestions for optimizing energy efficiency; at the same time, obtain the operating status data of each system module, and set safety thresholds for real-time detection, and provide real-time alarms when abnormalities are detected.

2. The comprehensive thermal management method for testing new energy lithium batteries according to claim 1, characterized in that: The S1 specifically includes: When the temperature inside the constant temperature box is lower than the set target temperature range, the heating mode is started; when the temperature inside the constant temperature box reaches the set target temperature range, the electric heating tube and the fan stop heating, and the integrated thermal management system for new energy lithium battery testing enters the constant temperature mode; when the temperature inside the constant temperature box is higher than the set target temperature range, the cooling mode is started.

3. The comprehensive thermal management method for testing new energy lithium batteries according to claim 1, characterized in that: The S1 specifically includes: In a constant temperature environment, the switching options for direct cooling and direct heating modes are as follows: When the battery pack is charging or discharging and the real-time temperature is higher than the set temperature range, select the direct cooling mode; when the battery pack is charging or discharging and the real-time temperature is lower than the set temperature range, select the direct heating mode; when the battery pack is in standby mode and the real-time temperature is higher than the set temperature range, select the direct cooling mode; when the battery pack is in standby mode and the real-time temperature is lower than the set temperature range, select the direct heating mode.

4. A comprehensive thermal management system for testing new energy lithium batteries, characterized in that: The comprehensive thermal management method for testing new energy lithium batteries according to any one of claims 1 to 3 comprises the following parts: Constant temperature environment control system, refrigerant direct cooling and heating system, multi-target tracking frequency conversion control system, energy consumption monitoring system, safety protection system; The constant temperature environment control system includes a constant temperature box, a refrigeration system, a second compressor, a second condenser, a second electronic expansion valve, a second evaporator, an electric heating pipe and a fan. The second compressor is connected to the second condenser, and then flows into the second electronic expansion valve, and then connected to the second evaporator, and then returns to the second compressor. There is a fan behind the electric heating pipe, which provides constant temperature control signals and actual temperature data for the multi-target tracking frequency conversion control system and the refrigerant direct cooling and direct heating system; The refrigerant direct cooling and direct heating system switches between direct cooling and direct heating modes according to the charge and discharge status of the battery pack, the real-time temperature and the set target temperature; direct cooling mode: the first compressor, the first condenser, the first subcooler, the first electronic expansion valve, the first evaporator, the first pressure regulating valve and the regenerator; direct heating mode: the first compressor, the first bypass valve No. 1, the first subcooler, the first bypass valve No. 2, the first direct heating electronic expansion valve, the first regenerator, providing adjusted parameter points for the multi-target tracking variable frequency control system; The multi-target tracking frequency conversion control system is based on the constant temperature environment control system and the refrigerant direct cooling and heating system. It adjusts the frequency parameter points of the electric heating and refrigeration compressors through the multi-target tracking frequency conversion control technology, and transmits the frequency adjustment signals of the compressor and the electric heating pipe and the adjusted temperature data back to the constant temperature environment control system and the refrigerant direct cooling and heating system; The energy consumption monitoring system monitors the energy consumption of each system module of the integrated thermal management system for new energy lithium battery testing based on the current and power data of the constant temperature environment control system, the refrigerant direct cooling and heating system, and other electrical components; The safety protection system obtains the operating status data of each system module in the integrated thermal management system for testing new energy lithium batteries, and performs real-time detection based on the acquired operating status data to detect safety hazards and provide real-time alarm information.

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