Immersed liquid-cooled power battery thermal management system

Abstract

The invention relates to the technical field of battery thermal management, in particular to an immersed liquid-cooled power battery thermal management system, which is provided with a data processing unit and integrates a plurality of modules such as a data storage module, a data analysis module, a data control module and the like, and the data storage module can store real-time data of a cooling unit and can also store normal operation data information. The data analysis module carries out comparative analysis on real-time data and normal operation data and accurately grasps the temperature change trend, and the data control module carries out intelligent control on the whole thermal management system according to a preset strategy and an analysis result, so that the working state of the cooling unit is accurately adjusted; the rotating speed of the circulating pump and the working strength of the radiator are adjusted according to the difference between the highest temperature of the battery cell and the initial temperature of the cooling liquid to ensure efficient operation of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of battery thermal management, and particularly relates to an immersion liquid-cooled power battery thermal management system. Background Art

[0002] With the booming development of the new energy vehicle industry, as the core component, the performance and safety of power batteries are becoming increasingly crucial. During the charging and discharging process of power batteries, a large amount of heat is generated. If the heat cannot be dissipated in a timely and effective manner, the battery temperature will be too high, leading to a decline in battery performance, a shortening of the battery life, and even potential safety hazards. At the same time, precise temperature control is also crucial for ensuring the stable operation and efficient working of the battery.

[0003] In traditional power battery thermal management technologies, due to the low specific heat capacity and thermal conductivity of air, the air-cooling technology has limited heat dissipation efficiency, making it difficult to meet the heat dissipation requirements of high-energy density batteries and prone to uneven temperature distribution within the battery pack. In addition, there are also obvious deficiencies in the operation status monitoring of existing thermal management systems. Many systems can only monitor some key parameters and cannot conduct all-round real-time monitoring of the battery module and the coolant circulation system, making it difficult to detect potential abnormalities at an early stage, which poses a threat to the stable operation of the system.

[0004] In terms of data processing and decision-making, traditional thermal management systems lack intelligent data processing capabilities. Data storage is scattered, and it is impossible to effectively integrate and analyze real-time data and normal operation data, making it difficult to accurately grasp the temperature change trend, and thus impossible to intelligently and precisely control the thermal management system according to the actual situation, resulting in low system operation efficiency and high energy consumption. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the technical solution adopted by the present invention to solve its technical problems is: an immersion liquid-cooled power battery thermal management system, including: a cooling unit, a data processing unit, and a receiving unit, wherein:

[0006] The cooling unit is used for the cooling and monitoring of the power battery;

[0007] The data processing unit is used for receiving the detected data information, analyzing the received data information, and allocating maintenance work for abnormal conditions. The data processing unit is connected to the cooling unit;

[0008] The receiving unit is used for remotely receiving battery information and providing abnormal reminders and information displays. The receiving unit is connected to the data processing unit.

[0009] The present invention is further configured such that the cooling unit, the data processing unit, and the receiving unit are connected to each other.

[0010] The present invention is further configured such that the cooling unit includes a battery accommodation module, a cooling module, and an operation detection module;

[0011] The battery accommodation module serves as a sealed container for accommodating the battery module and the coolant;

[0012] The cooling module is used to circulate the coolant in the battery accommodation module to take away the heat generated by the battery module. The cooling module is composed of a circulation pump, a circulation pipe, and a radiator;

[0013] The operation detection module is used to monitor the real-time operation status of the battery accommodation module and the cooling module. The operation monitoring module is connected to both the battery accommodation module and the cooling module.

[0014] The present invention is further configured such that the operation detection module includes a cell temperature sensor, a cooling temperature sensor, and a flow rate sensor;

[0015] The cell temperature sensor is arranged on the cells of the battery module to monitor the temperature at both ends of the battery module and the cells;

[0016] The cooling temperature sensor is arranged in the coolant circulation pipeline to monitor the temperature of the coolant in real time;

[0017] The flow rate sensor is arranged in the coolant circulation pipeline to monitor the flow rate of the coolant in real time.

[0018] The present invention is further configured such that the data processing unit includes a data storage module, a data analysis module, and a data control module;

[0019] The data storage module is used to store and receive the data information of the cooling unit and store the set normal operation data information;

[0020] The data analysis module is used to compare and analyze the received data information with the stored normal operation data information;

[0021] The data control module controls the entire thermal management system according to a preset strategy and controls and adjusts the working state of the cooling unit;

[0022] The present invention is further configured such that the data processing unit further includes an abnormal warning module, and the abnormal warning module is used to transmit the abnormal data analyzed by the analysis module.

[0023] The present invention is further configured such that the receiving unit includes a display module and an abnormal reminder module;

[0024] The display module is used to display the information of the received abnormal warning;

[0025] The abnormal reminder module is used to issue an abnormal reminder warning alarm. The abnormal reminder module gives a prompt through a pop-up window on the display, and the external device gives an alarm prompt through the sound of a buzzer and the flashing of a warning light. The abnormal reminder module is connected to the display module.

[0026] The present invention is further configured such that the control method of the data processing unit is as follows:

[0027] Step S1: Obtain temperature data through the operation detection module. Under the action of the cell temperature sensor and the cooling temperature sensor, use the dynamic temperature compensation algorithm to obtain temperature data in real time;

[0028] Step S2: The temperature data is input from the operation detection module to the data processing unit. Through comparison with the internal data by the data storage module, the data analysis module analyzes the temperature change trend to obtain result data;

[0029] Step S3: According to the result data, formulate a temperature control strategy. If the result data shows that the difference between the highest temperature of the cell and the initial temperature of the coolant is greater than the difference threshold of 1 - 2 °C, the data control module increases the rotation speed of the circulation pump to increase the flow rate of the coolant; otherwise, keep the temperature. When the difference between the highest temperature of the cell and the initial temperature of the coolant exceeds the threshold, the abnormal warning module transmits the information;

[0030] Step S4: When the coolant temperature is high, the data control module starts the fan of the radiator or increases the flow rate of the water cooling system to accelerate heat dissipation; when the coolant temperature is low, reduce the working intensity of the radiator to save energy. According to the difference between the highest temperature of the cell and the initial temperature of the coolant, combined with the heat load calculation of the system, determine the flow rate requirement of the coolant. Control the flow rate of the coolant by adjusting the rotation speed of the circulation pump to meet the heat dissipation requirement. When the difference between the highest temperature of the cell and the initial temperature of the coolant is greater than the difference threshold, increase the rotation speed of the circulation pump to increase the flow rate of the coolant and enhance the heat dissipation effect.

[0031] Control the working state of the radiator according to the temperature of the coolant. When the coolant temperature is high, start the fan of the radiator or increase the flow rate of the water cooling system to accelerate heat dissipation; when the coolant temperature is low, reduce the working intensity of the radiator to save energy.

[0032] During the operation of the system, obtain the temperatures of multiple cells in real time, calculate the maximum cell temperature difference, and compare it with the cell temperature difference threshold. If the maximum cell temperature difference exceeds the cell temperature difference threshold, the BMS adjusts according to the current working state of the circulation pump. If the circulation pump is at the lowest rotation speed, maintain the current rotation speed; if it is not at the lowest rotation speed, then reduce the rotation speed of the circulation pump and run for a period of time to adjust the flow rate and flow distribution of the coolant to make the cell temperatures more uniform.

[0033] The present invention is further configured such that in the step S1, the specific operation steps of the dynamic compensation algorithm are as follows:

[0034] Step A1: The temperature T of each battery cell is collected in real time through a battery cell temperature sensor, the coolant inlet temperature T cell,i and the outlet temperature T 1,in are collected by a coolant temperature sensor, and the flow rate Q1 of the coolant is collected by a flow sensor, and the collected data is filtered; 2,in The formula for filtering is:

[0035] where k is the current sampling time and m is the size of the sliding window;

[0036]

[0037]

[0038] Step A2: Calculate the heat load of the battery module according to the collected battery cell temperature and coolant temperature;

[0039] The formula for calculating the heat load is:

[0040] Q2 = C1ρ1Q1(T 2,in - T 1,in )

[0041] where Q2 is the heat load, C1 is the specific heat capacity of the coolant, and ρ1 is the density of the coolant;

[0042] Step A3: Set the target temperature of the battery module according to the working state of the battery and the environmental conditions, and calculate the temperature deviation of the current battery module;

[0043] The formula for calculating the temperature deviation is:

[0044]

[0045] T = T1 - T2

[0046] T2 is the average temperature, T is the temperature difference, and T1 is the target temperature;

[0047] Step A4: Dynamically adjust the flow rate and temperature of the coolant according to the temperature deviation and the heat load, and use a fuzzy control algorithm, taking the temperature deviation and the heat load as inputs and the flow rate adjustment coefficient and the temperature adjustment coefficient of the coolant as outputs;

[0048] Step A5: Adjust the parameters of the coolant circulation system according to the calculated flow rate adjustment coefficient and temperature adjustment coefficient.

[0049] ​After adjusting the coolant circulation system, the temperature change of the battery module is monitored in real time, and the algorithm is corrected according to the feedback results. At the same time, according to the historical data and the current working conditions, the temperature change trend of the battery module in the next period of time is predicted, and the flow rate and temperature of the coolant are adjusted in advance to improve the response speed and control accuracy of the system.

[0050] The beneficial effects of the present invention are as follows:

[0051] 1. The present invention adopts the immersion liquid cooling technology, and the coolant directly contacts the battery module, greatly improving the heat dissipation efficiency, effectively controlling the temperature of the battery during charging and discharging. At the same time, with the help of the dynamic temperature compensation algorithm, by collecting data such as the temperature of the battery cell, the temperature and flow rate of the coolant in real time, the heat load and temperature deviation are accurately calculated to ensure that the battery module is always in the optimal working temperature range, avoiding the decline of battery performance and the shortening of battery life caused by too high or too low temperature.

[0052] 2. The present invention is equipped with a battery cell temperature sensor, a cooling temperature sensor and a flow sensor in the operation detection module of the cooling unit, which can conduct all-round real-time monitoring of the battery module and the coolant circulation system. It can not only monitor the temperature at both ends of the battery module and the battery cell, but also master the temperature and flow rate of the coolant in real time, and timely discover potential abnormal situations, providing a strong guarantee for the stable operation of the system.

[0053] 3. The present invention integrates multiple modules such as data storage, analysis and control through the data processing unit. The data storage module can not only store the real-time data of the cooling unit, but also save the normal operation data information, providing a basis for data analysis. The data analysis module compares and analyzes the real-time data with the normal operation data to accurately grasp the temperature change trend. The data control module, according to the preset strategy, intelligently controls the entire thermal management system based on the analysis results, realizing precise adjustment of the working state of the cooling unit, such as adjusting the rotation speed of the circulation pump and the working intensity of the radiator according to the difference between the highest temperature of the battery cell and the initial temperature of the coolant, ensuring the efficient operation of the system. Brief Description of the Drawings

[0054] Figure 1 is the system diagram of the present invention;

[0055] Figure 2 is the system diagram of the cooling unit of the present invention;

[0056] Figure 3 is the system diagram of the data processing unit of the present invention;

[0057] Figure 4 is the system diagram of the receiving unit of the present invention. Detailed Embodiments

[0058] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for specific purposes.

[0059] Embodiment:

[0060] Please refer to Figures 1-4 , the present invention provides a technical solution: an immersion liquid-cooled power battery thermal management system, including: a cooling unit 100, a data processing unit 200, and a receiving unit 300, where:

[0061] The cooling unit 100 is used for cooling and monitoring of the power battery;

[0062] The data processing unit 200 is used to receive the detected data information, analyze the received data information, and allocate maintenance work for abnormal conditions. The data processing unit 200 is connected to the cooling unit 100;

[0063] The receiving unit 300 is used to remotely receive battery information, and provide abnormal reminder and information display. The receiving unit 300 is connected to the data processing unit 200.

[0064] The cooling unit 100, the data processing unit 200, and the receiving unit 300 are connected to each other.

[0065] The cooling unit 100 includes a battery accommodation module 110, a cooling module 120, and an operation detection module 130;

[0066] The battery accommodation module 110 is used as a sealed container to accommodate the battery module and the coolant;

[0067] The cooling module 120 is used to circulate the coolant in the battery accommodation module 110 to take away the heat generated by the battery module. The cooling module 120 is composed of a circulation pump, a circulation pipe, and a radiator;

[0068] The operation detection module 130 is used to monitor the real-time operation status of the battery accommodation module 110 and the cooling module 120. The operation monitoring module 130 is connected to both the battery accommodation module 110 and the cooling module 120.

[0069] The operation detection module 130 includes a cell temperature sensor 131, a cooling temperature sensor 132, and a flow sensor 133;

[0070] The cell temperature sensor 131 is arranged on the cells of the battery module and is used to monitor the temperatures at both ends of the battery module and the cells.

[0071] The cooling temperature sensor 132 is arranged in the coolant circulation pipeline and is used to monitor the temperature of the coolant in real time.

[0072] The flow sensor 133 is arranged in the coolant circulation pipeline and is used to monitor the flow rate of the coolant in real time.

[0073] The data processing unit 200 includes a data storage module 210, a data analysis module 220, and a data control module 230.

[0074] The data storage module 210 is used to store and receive the data information of the cooling unit 100 and store the set normal operation data information.

[0075] The data analysis module 220 is used to compare and analyze the received data information with the stored normal operation data information.

[0076] The data control module 230 controls the entire thermal management system according to a preset strategy and controls and adjusts the working state of the cooling unit 100.

[0077] The data processing unit 200 further includes an abnormal warning module 240, and the abnormal warning module 240 is used to conduct the abnormal data analyzed by the analysis module 220.

[0078] The receiving unit 300 includes a display module 310 and an abnormal reminder module 330.

[0079] The display module 310 is used to display the information of the received abnormal warning.

[0080] The abnormal reminder module 330 is used to issue an abnormal reminder warning alarm. The abnormal reminder module 330 gives an alarm prompt through a pop-up window on the display, and an external device gives an alarm prompt through the sound of a buzzer and the flashing of a warning light. The abnormal reminder module 330 is connected to the display module 310.

[0081] The control method of the data processing unit is as follows:

[0082] Step S1: Obtain temperature data through the operation detection module 130. Under the action of the cell temperature sensor 131 and the cooling temperature sensor 132, use the dynamic temperature compensation algorithm to obtain temperature data in real time.

[0083] Step S2: The temperature data is input from the operation detection module 130 to the data processing unit 200. Through comparison with the internal data by the data storage module 210, the data analysis module 220 analyzes the temperature change trend to obtain result data.

[0084] Step S3: Develop a temperature control strategy based on the result data. If the result data shows that the difference between the maximum temperature of the battery cell and the initial temperature of the coolant is greater than the difference threshold of 1 - 2 °C, the data control module 230 increases the rotation speed of the circulation pump to increase the flow rate of the coolant; otherwise, the temperature is maintained. When the difference between the maximum temperature of the battery cell and the initial temperature of the coolant exceeds the threshold, the anomaly warning module 240 transmits the information.

[0085] Step S4: When the coolant temperature is high, the data control module 230 starts the fan of the radiator or increases the flow rate of the water cooling system to accelerate heat dissipation; when the coolant temperature is low, the working intensity of the radiator is reduced to save energy.

[0086] In step S1, the specific operation steps of the dynamic compensation algorithm are as follows:

[0087] Step A1: The temperature of each battery cell is collected in real time through the battery cell temperature sensor 131, the inlet temperature of the coolant is collected through the coolant temperature sensor 132, and the flow rate of the coolant is collected through the flow sensor 133, and the collected data is filtered.

[0088] Step A2: Calculate the heat load of the battery module based on the collected battery cell temperature and coolant temperature.

[0089] Step A3: Set the target temperature of the battery module according to the working state of the battery and the environmental conditions, and calculate the temperature deviation of the current battery module.

[0090] Step A4: Dynamically adjust the flow rate and temperature of the coolant according to the temperature deviation and heat load. Adopt the fuzzy control algorithm, with the temperature deviation and heat load as inputs, and the flow rate adjustment coefficient and temperature adjustment coefficient of the coolant as outputs.

[0091] Step A5: Adjust the parameters of the coolant circulation system according to the calculated flow rate adjustment coefficient and temperature adjustment coefficient.

[0092] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the scope of protection of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention shall be implemented by conventional means in the art without special description and limitation.

Claims

1. An immersion liquid-cooled power battery thermal management system, characterized in that: include: A cooling unit (100), a data processing unit (200) and a receiving unit (300), wherein: The cooling unit (100) is used for cooling and monitoring the power battery; The data processing unit (200) is used to receive the detected data information, analyze the received data information, and allocate maintenance work for abnormal conditions, and the data processing unit (200) is connected to the cooling unit (100); The receiving unit (300) is used to remotely receive battery information and provide abnormality reminders and information display. The receiving unit (300) is connected to the data processing unit (200).

2. The immersion liquid-cooled power battery thermal management system according to claim 1, characterized in that: The cooling unit (100), the data processing unit (200) and the receiving unit (300) are connected.

3. The immersion liquid-cooled power battery thermal management system according to claim 1, characterized in that: The cooling unit (100) comprises a battery containing module (110), a cooling module (120) and an operation detection module (130); The battery containing module (110) is used as a sealed container to contain the battery module and the coolant; The cooling module (120) is used to circulate the coolant in the battery containing module (110) to remove the heat generated by the battery module, and the cooling module (120) is composed of a circulation pump, a circulation pipe and a radiator; The operation detection module (130) is used to perform real-time operation status monitoring on the battery containing module (110) and the cooling module (120); the operation monitoring module (130) is connected to both the battery containing module (110) and the cooling module (120).

4. The immersion liquid-cooled power battery thermal management system according to claim 3, characterized in that: The operation detection module (130) comprises a battery core temperature sensor (131), a cooling temperature sensor (132) and a flow sensor (133); The battery core temperature sensor (131) is arranged on the battery core of the battery module and is used to monitor the temperature of both ends of the battery module and the battery core; The cooling temperature sensor (132) is arranged in the cooling liquid circulation pipeline and is used to monitor the temperature of the cooling liquid in real time; The flow sensor (133) is arranged in the coolant circulation pipeline and is used to monitor the flow rate of the coolant in real time.

5. The immersion liquid-cooled power battery thermal management system according to claim 1, characterized in that: The data processing unit (200) comprises a data storage module (210), a data analysis module (220) and a data control module (230); The data storage module (210) is used to store and receive data information of the cooling unit (100) and store set normal operation data information; The data analysis module (220) is used to compare and analyze the received data information with the stored normal operation data information; The data control module (230) controls the entire thermal management system according to a preset strategy, and controls and adjusts the working state of the cooling unit (100).

6. The immersion liquid-cooled power battery thermal management system according to claim 5, characterized in that: The data processing unit (200) further comprises an abnormal warning module (240), wherein the abnormal warning module (240) is used to transmit abnormal data analyzed by the analysis module (220).

7. The immersion liquid-cooled power battery thermal management system according to claim 1, characterized in that: The receiving unit (300) comprises a display module (310) and an abnormality reminder module (330); The display module (310) is used to display the received abnormal warning information; The abnormality reminder module (330) is used to issue an abnormality reminder warning alarm. The abnormality reminder module (330) issues a prompt through a pop-up window on the display, and the external device issues an alarm prompt through the sound of a buzzer and the flashing of a warning light. The abnormality reminder module (330) is connected to the display module (310).

8. The immersion liquid-cooled power battery thermal management system according to claim 1, characterized in that: The control method of the data processing unit is as follows: Step S1: acquiring temperature data by operating the detection module (130), and acquiring temperature data in real time by using a dynamic temperature compensation algorithm under the action of a battery core temperature sensor (131) and a cooling temperature sensor (132); Step S2: The temperature data is input from the operation detection module (130) to the data processing unit (200), compared with the internal data through the data storage module (210), and the data analysis module (220) analyzes the temperature change trend to obtain result data; Step S3: formulating a temperature control strategy based on the result data; if the result data shows that the difference between the maximum temperature of the battery cell and the initial temperature of the coolant is greater than a difference threshold of 1-2°C, the data control module (230) increases the speed of the circulation pump and increases the flow rate of the coolant; otherwise, the temperature is maintained; when the difference between the maximum temperature of the battery cell and the initial temperature of the coolant exceeds the threshold, the abnormal warning module (240) transmits the information; Step S4: When the temperature of the coolant is high, the data control module (230) starts the fan of the radiator or increases the flow of the water cooling system to accelerate heat dissipation; when the temperature of the coolant is low, the working intensity of the radiator is reduced to save energy.

9. The immersion type liquid-cooled power battery thermal management system according to claim 8, characterized in that: In step S1, the specific operation steps of the dynamic compensation algorithm are as follows: Step A1: collecting the temperature of each battery cell in real time through a battery cell temperature sensor (131), collecting the coolant inlet temperature through a cooling temperature sensor (132), collecting the coolant flow through a flow sensor (133), and filtering the collected data; Step A2: Calculate the heat load of the battery module according to the collected battery cell temperature and coolant temperature; Step A3: according to the working state and environmental conditions of the battery, set the target temperature of the battery module and calculate the temperature deviation of the current battery module; Step A4: dynamically adjust the flow rate and temperature of the coolant according to the temperature deviation and the heat load, using a fuzzy control algorithm, taking the temperature deviation and the heat load as inputs, and the flow rate adjustment coefficient and the temperature adjustment coefficient of the coolant as outputs; Step A5: According to the calculated flow adjustment coefficient and temperature adjustment coefficient, the parameters of the coolant circulation system are adjusted.

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