Double-effect thermal management system of power battery box

Abstract

The invention discloses a double-effect heat management system for a power battery box, and the system comprises a heat pipe heat exchanger which comprises a plane heat pipe heat exchanger and an external environment heat exchanger, and the plane heat pipe heat exchanger is disposed in the power battery box, is tightly attached to the surface of a power battery, and is used for absorbing the heat or cold of the power battery; the external environment heat exchanger is arranged outside the power battery box, is connected with the plane heat pipe heat exchanger and is used for releasing heat or cold energy to the external environment; the temperature monitoring management system performs temperature monitoring and control operation on the environment in the power battery box and sets an upper limit value and a lower limit value of the temperature so as to ensure that the environment temperature in the battery box is within a range limited by the upper limit value and the lower limit value; the danger alarm management system is used for setting a limit temperature value and sending out an alarm signal when the environment temperature in the power battery box reaches the limit temperature value; and the intelligent evaluation management system is used for providing a battery safe use suggestion for a user.

Description

Technical Field

[0001] The present invention relates to an adaptive dual-effect thermal management system for a power battery box under extreme temperature conditions, especially to three key problems: high temperature in summer, low temperature in winter, and the fact that the interior of the power battery box is a closed, narrow and confined space, making it difficult to use traditional fluid media for efficient convection heat exchange. A dual-effect thermal management system for electric vehicle batteries designed for extreme weather conditions is of great significance for ensuring the performance of electric vehicle batteries and the safety of users. Background Art

[0002] According to the "White Paper on China's Two-wheeled Electric Vehicle Industry in 2022", the total sales volume of electric vehicles in my country that year was 41 million, and the annual sales volume of batteries matching electric vehicles was even greater. If the performance and life of electric vehicle batteries are reduced due to unscientific and unreasonable use, it will not only waste a lot of energy and material resources, but also pollute our ecological environment during the production and disposal of batteries, which is obviously not in line with the requirements of the scientific development concept. Under the same conditions of use, scientific and reasonable thermal management of electric vehicle batteries, improving the performance of electric vehicle batteries and extending their life can significantly save energy and material resources. In addition, with the rapid development of electric vehicle power batteries, their potential safety hazards have become increasingly prominent. The external manifestations of battery thermal runaway are mainly smoke, combustion and explosion.

[0003] The failure of power batteries is a complex process of physical and chemical interactions. The thermal runaway problem of power batteries is usually induced by electrical factors, thermal factors, and mechanical factors alone or in combination. To control the high temperature of the battery, in addition to considering its charging and discharging temperature rise, the influence of the extreme ambient temperature cannot be ignored. Generally, the high temperature limit of lithium batteries is 40℃, and the maximum limit is in the range of 40℃-60℃. However, in the hot summer, for example, in Nanjing, a southern city in my country, the daytime temperature has been close to 40℃ for several days in summer (the surface temperature rises more significantly under the action of thermal radiation). In such a high temperature environment, coupled with the heat release of the battery itself during charging and discharging, the battery temperature rise is significantly increased, which increases the risk index of thermal runaway of the battery. Therefore, it is necessary to carry out more effective thermal management of electric vehicle batteries under extreme high temperature weather conditions. In addition, it should be pointed out that in addition to the impact of high temperature on battery performance and life, the impact of low temperature on the battery cannot be ignored. Generally, the low temperature limit of lithium batteries is -20℃. The lower the temperature, the lower the battery activity, and the charging and discharging efficiency is greatly reduced. When the temperature is below 0℃, it is difficult to charge outdoors. When the temperature is below -20℃, the battery will automatically enter a dormant state and cannot be used normally. However, the low temperature in most cities in my country is below 0℃ in winter, and it is common in the northeast region to have a temperature below -20℃ in winter. Therefore, it is necessary to take certain preheating measures when charging or using electric vehicle batteries under extremely low temperature weather conditions.

[0004] From the above analysis, it can be seen that it is very necessary to develop a thermal management measure that can perform bidirectional cooling or preheating of power batteries under extreme weather and temperature conditions. In addition, considering that the interior of the battery box is a closed and narrow space, it is difficult to exert effective heat exchange capabilities using traditional fluid medium convection heat exchange methods such as air cooling and water cooling. In response to the above three key issues: high temperatures in summer, low temperatures in winter, and difficult heat exchange in closed and narrow spaces, this patent designs a dual-effect thermal management system for electric vehicle batteries under extreme weather conditions, which is of great significance to ensuring the performance of electric vehicle batteries and the safety of users. Summary of the invention

[0005] The purpose of the present invention is to provide a power battery box adaptive dual-effect thermal management system under extreme temperature conditions.

[0006] To achieve the above object, the present invention adopts the following technical solution: A dual-effect thermal management system for a power battery box, comprising: The heat pipe heat exchanger includes a planar heat pipe heat exchanger and an external environment heat exchanger. The planar heat pipe heat exchanger is arranged in the power battery box and is close to the surface of the power battery, and is used to absorb heat or cold from the power battery; the external environment heat exchanger is arranged outside the power battery box, and is connected to the planar heat pipe heat exchanger, and is used to release heat or cold to the external environment; The temperature monitoring and management system performs temperature monitoring and control operations on the environment inside the power battery box, sets the upper and lower limits of the temperature, and thus ensures that the ambient temperature inside the battery box is within the range defined by the upper and lower limits; The hazard alarm management system sets a limit temperature value, and when the ambient temperature inside the power battery box reaches the limit temperature value, an alarm signal is issued; Intelligent evaluation and management system, used to provide users with battery safety recommendations.

[0007] Furthermore, the planar heat pipe heat exchanger is a planar structure composed of a plurality of first heat pipes. The planar heat pipe heat exchanger is in a rectangular shape as a whole, and the plurality of first heat pipes are arranged in a mesh-like fractal shape imitating plant veins inside the rectangle.

[0008] Furthermore, the external environment heat exchanger is composed of a plurality of independent second heat pipes.

[0009] Furthermore, the external environment heat exchanger is arranged close to the outer surface of the battery box.

[0010] Furthermore, the temperature monitoring and management system includes a single-chip microcomputer, multiple temperature sensors, a heating device and a refrigeration device. The multiple temperature sensors are arranged inside the power battery box and connected to the single-chip microcomputer through a first signal processing circuit. The single-chip microcomputer is connected to a temperature setting module and is connected to the heating device and the refrigeration device respectively through relays in a PID control manner; the temperature sensor monitors the ambient temperature inside the power battery box, and the monitored temperature value is transmitted to the single-chip microcomputer. The single-chip microcomputer calculates the upper and lower limits set by the temperature setting module through a PID control algorithm. If the monitored temperature is lower than the lower limit, the heating device is controlled to start through a relay; if it is higher than the upper limit, the refrigeration device is controlled to start through a relay.

[0011] Furthermore, the heating device is a heating film, and the cooling device is a fan.

[0012] Furthermore, the hazard alarm management system includes a single-chip microcomputer, a high-temperature sensor, a smoke sensor, and an alarm device; there are multiple high-temperature sensors and smoke sensors, which are arranged in a power battery box, and the high-temperature sensor and the smoke sensor are connected to the single-chip microcomputer through a second signal processing circuit, and the single-chip microcomputer is connected to the alarm device. At the same time, the single-chip microcomputer is also connected to a reset circuit, a clock circuit, and a limit temperature setting module; the limit temperature setting module is used to set the limit temperature value. When the temperature detected by the high-temperature sensor exceeds the limit temperature value or the smoke sensor detects smoke, the single-chip microcomputer will trigger the alarm device to sound an alarm.

[0013] Furthermore, the alarm device comprises: The indicator light is connected to the single-chip microcomputer through the first current-limiting resistor, and when the alarm is triggered, the indicator light is lit or flashed to intuitively display the alarm information to the user; The buzzer is connected to the single-chip computer through the second current-limiting resistor, and plays the role of a sound alarm by making a sound when the alarm is triggered; The GSM SMS module is connected to the microcontroller through serial communication and connected to the user terminal through the GSM network. When the alarm is triggered, the GSM SMS module sends a text message containing alarm information to the pre-set user terminal to realize remote alarm notification.

[0014] Furthermore, the intelligent assessment management system includes: Initialize the setting module to set the current temperature value and the battery performance parameters under the current temperature conditions, including current power, estimated distance, estimated speed, battery voltage, battery capacity, and motor power; The battery life estimation module calculates the battery life of the electric vehicle under the current temperature conditions based on the parameters set by the initialization setting module and the extreme temperature influence factor; The battery usage recommendation module provides safe usage recommendations based on the estimated battery life results, including thermal management temperature control recommendations and optimal battery life.

[0015] Furthermore, the calculation formula for the electric vehicle's endurance value is: power battery endurance = battery voltage × battery capacity × electric vehicle speed ÷ motor power × extreme temperature impact factor, wherein the extreme temperature impact factor is obtained by analyzing a large amount of battery performance experimental data under different temperatures.

[0016] Beneficial effects: The present invention provides a dual-effect thermal management system for a power battery box, and proposes a thin planar heat pipe heat exchanger based on heat pipe and leaf vein bionic technology, which is applied to the interior of the power battery box. It has high heat exchange efficiency, good temperature equalization effect, small size and simple structure. Secondly, a temperature monitoring and management system is designed for the internal temperature of the power battery box to automatically monitor and control the internal temperature of the power battery box. If the temperature is lower than the lower limit, the heating device is started, and if the temperature is higher than the upper limit, the refrigeration device is started. In addition, in order to prevent accidents such as smoke and fire caused by excessive battery temperature, an extreme temperature alarm system is also set, including sound and light alarms and mobile phone text message alarms. In addition, an intelligent evaluation and management system has been developed to provide electric vehicle users with more convenient, scientific, reasonable, safe and effective usage suggestions. The scientific and reasonable use of electric vehicle batteries can better protect the safety and health of residents' production and life, save energy and protect the environment, and have better social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a dual-effect thermal management system of a power battery box of the present invention; Figure 2 It is a structural schematic diagram of a heat pipe heat exchanger; Figure 3 A power battery box for installing a heat pipe heat exchanger; Figure 4 A top view of the power battery box for installing the heat pipe heat exchanger; Figure 5 It is a schematic diagram of the temperature monitoring and management system; Figure 6 is a schematic diagram of a hazard alert management system; Figure 7 It is a schematic diagram of the intelligent assessment management system; Figure 8 This is a schematic diagram of the program interface of the intelligent assessment management system; Fig. 9 A schematic diagram of the initialization setting area of ​​the intelligent assessment management system program case (1) in the embodiment; Fig.10 A schematic diagram of the initialization setting area of ​​the intelligent assessment management system program case (2) in the embodiment; Fig.11A schematic diagram of a battery life estimation area for an intelligent evaluation management system program in an embodiment; Fig.12 This is an example of the intelligent evaluation management system program in the embodiment (1) battery life estimation result; Fig.13 This is the battery life estimation result of the intelligent evaluation management system program case (2) in the embodiment; Fig.14 A schematic diagram of a battery health usage suggestion area of ​​an intelligent assessment management system program in an embodiment; Fig.15 This is the intelligent evaluation management system program case in the embodiment (1) battery usage recommendation result; Fig.16 This is the battery usage recommendation result of the intelligent evaluation management system program case (2) in the embodiment. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, a dual-effect thermal management system for a power battery box of the present invention includes a heat pipe heat exchanger, a temperature monitoring management system, a danger alarm management system, and an intelligent evaluation management system.

[0020] In order to solve the problem of efficient heat exchange in the enclosed and narrow confined space of a power battery box, the present invention arranges a heat pipe heat exchanger in the power battery box. The heat pipe heat exchanger is based on the high-efficiency heat transfer element - the heat pipe has the characteristics of high heat transfer efficiency, simple structure, low cost, reliable operation, etc. The heat pipe heat exchanger can efficiently cool or heat the narrow and confined space inside the battery box.

[0021] like Figures 2 to 4 As shown, the heat pipe heat exchanger includes a planar heat pipe heat exchanger 1 and an external environment heat exchanger 2. The planar heat pipe heat exchanger 1 is arranged in the power battery box 4 and is close to the surface of the power battery 3, and is used to absorb heat or cold from the power battery; the external environment heat exchanger 2 is arranged outside the power battery box 4, and the external environment heat exchanger 2 is connected to the planar heat pipe heat exchanger 1, and is used to release heat or cold to the external environment.

[0022] like Figure 2 As shown, the planar heat pipe heat exchanger 1 is a planar structure composed of a plurality of first heat pipes 101. The planar heat pipe heat exchanger 1 is a rectangular structure as a whole, and the plurality of first heat pipes 101 are arranged in a mesh-like fractal shape imitating plant veins inside the rectangle. Specifically, the planar heat pipe heat exchanger 1 can be arranged on one or more surfaces of the power battery 3.

[0023] like Figure 2 and 3 As shown, the external environment heat exchanger 2 is composed of a plurality of independent second heat pipes 201 .

[0024] In order to optimize the space occupied by the heat pipe heat exchanger as a whole, the external environment heat exchanger 2 located outside the power battery box 4 is arranged close to the outer surface of the power battery box 4, such as Figure 3 and 4 shown.

[0025] A single heat pipe consists of a tube shell and a liquid wick, and transfers heat through the evaporation and condensation of liquid in a fully enclosed vacuum tube.

[0026] When the heat pipe heat exchanger is used as a radiator, the heating section of the first heat pipe 101 inside the battery box is heated, the liquid in the first heat pipe 101 evaporates and flows to the second heat pipe 201 outside the battery box, releasing heat and condensing into liquid, and the liquid then flows back to the first heat pipe 101 along the porous material wick on the inner wall of the cooling section by capillary force. When used as a preheater, the first heat pipe 101 outside the battery box is heated, the liquid in the pipe evaporates and flows to the first heat pipe 101 inside the battery box to transfer heat to the battery box.

[0027] In view of the efficient heat exchange method based on heat pipes, in order to realize thermal management functions such as the start and stop of cooling / preheating that is adaptive to extreme temperatures, and high temperature danger alarm, the present invention provides a temperature monitoring management system and a danger alarm management system.

[0028] The temperature monitoring and management system performs temperature monitoring and control operations on the environment inside the power battery box, sets the upper and lower temperature limits, and thus ensures that the ambient temperature inside the battery box is within the range defined by the upper and lower limits.

[0029] like Figure 5 As shown, the temperature monitoring and management system includes a single-chip microcomputer, multiple temperature sensors, a heating device and a cooling device. The multiple temperature sensors are arranged inside the power battery box and are connected to the single-chip microcomputer through a first signal processing circuit. The single-chip microcomputer is connected to a temperature setting module and is connected to the heating device and the cooling device respectively through relays in a PID control manner; the temperature sensor monitors the ambient temperature inside the power battery box, and the monitored temperature value is transmitted to the single-chip microcomputer. The single-chip microcomputer calculates the upper and lower limits set by the temperature setting module through a PID control algorithm. If the monitored temperature is lower than the lower limit, the heating device is controlled to start through a relay. If it is higher than the upper limit, the cooling device is controlled to start through a relay.

[0030] In one embodiment, the single chip microcomputer adopts 51 single chip microcomputer, the temperature sensor adopts DS18B20 temperature sensor, the heating device adopts heating film, the cooling device adopts fan, and the temperature setting module adopts 4-digit digital tube, button and indicator light.

[0031] 51 single-chip microcomputer: As the core control unit of the temperature monitoring and management system, it is responsible for coordinating the work of various components, processing the temperature data transmitted by the temperature sensor, and controlling the operation of other equipment according to the preset upper and lower temperature limits.

[0032] DS18B20 temperature sensor: Accurately monitors the ambient temperature inside the battery box. Its detection range is -55.0~125.0 degrees Celsius with an accuracy of 0.1 degrees Celsius, and can provide accurate temperature information for the system.

[0033] 4-digit digital tube: used to intuitively display the current temperature value or the upper and lower temperature limits set by the system, making it convenient for users to view temperature-related information.

[0034] Buttons: including "Set Button", "Minus Button" and "Plus Button". Among them, the "Set Button" is used to enter and exit the temperature setting mode; the "Minus Button" and "Plus Button" can increase or decrease the upper and lower limit temperature values ​​of the temperature control in the setting mode.

[0035] Indicator lights: There are "temperature upper limit light", "temperature lower limit light", "green light" and "red light". The "temperature upper limit light" and "temperature lower limit light" light up when the upper and lower limits of the temperature are set, prompting the user that they are in the setting state; when the temperature is lower than the lower limit, the "green light" is on, indicating that the heating device (heating film) is working to heat up; when the temperature is higher than the upper limit, the "red light" is on, indicating that the refrigeration device (fan) is working to cool down.

[0036] The setting process of the temperature control system is as follows: press the "Set button", and the "Upper temperature limit light" and "Lower temperature limit light" will light up at the same time, indicating that the system has entered the temperature setting mode. In the setting mode, by operating the "minus button" and "plus button", the upper and lower temperature limits of the temperature control can be accurately set. After completing the temperature value setting, press the "Set button" again, and the system will enter the normal working mode and start to monitor and control the ambient temperature inside the battery box.

[0037] When the temperature detected by the temperature sensor is lower than the set lower limit: the "green light" turns on, indicating that the heating device (heating film) is about to start. The heating device (heating film) starts to work and heats up the environment inside the battery box until the temperature rises above the lower limit. When the temperature detected by the temperature sensor is higher than the set upper limit: the "red light" turns on, indicating that the cooling device (fan) is about to start.

[0038] The hazard alarm management system sets a limit temperature value, and when the ambient temperature inside the power battery box reaches the limit temperature value, an alarm signal is issued.

[0039] like Figure 6As shown, the hazard alarm management system includes a single-chip microcomputer, a high-temperature sensor, a smoke sensor, and an alarm device; there are multiple high-temperature sensors and smoke sensors, which are arranged in the power battery box, and the high-temperature sensor and the smoke sensor are connected to the single-chip microcomputer through the second signal processing circuit, and the single-chip microcomputer is connected to the alarm device. At the same time, the single-chip microcomputer is also connected to a reset circuit, a clock circuit and a limit temperature setting module; the limit temperature setting module is used to set the limit temperature value. When the temperature detected by the high-temperature sensor exceeds the limit temperature value or the smoke sensor detects smoke, the single-chip microcomputer will trigger the alarm device to sound an alarm.

[0040] In one embodiment, the single chip microcomputer adopts 51 single chip microcomputer, the high temperature sensor adopts DS18B20 temperature sensor. The limit temperature setting module adopts 4-digit digital tube, key, indicator light. The alarm device includes indicator light, buzzer, GSM SMS module.

[0041] 51 single-chip microcomputer: As the core control unit of the hazard alarm management system, it is responsible for receiving data from the temperature sensor, processing and controlling other components according to the set conditions, such as starting the sound and light alarm and SMS alarm when the temperature exceeds the limit.

[0042] DS18B20 temperature sensor: used to accurately detect the ambient temperature inside the battery box. The detection range is -55.0~125.0 degrees Celsius with an accuracy of 0.1 degrees Celsius. It provides temperature information to the system and is the key basis for determining whether to trigger an alarm.

[0043] 4-digit digital tube: used to display the ambient temperature value, so that users can intuitively understand the current temperature conditions.

[0044] Button: The "Set button" is used to set the upper limit temperature value of temperature control.

[0045] The indicator light is connected to the single-chip microcomputer through the first current-limiting resistor, and when the alarm is triggered, the indicator light is lit or flashed to intuitively display the alarm information to the user; The buzzer is connected to the single-chip computer through the second current-limiting resistor, and plays the role of a sound alarm by making a sound when the alarm is triggered; The GSM SMS module is connected to the microcontroller through serial communication and connected to the user terminal through the GSM network. When the alarm is triggered, the GSM SMS module sends a text message containing alarm information to the pre-set user terminal to realize remote alarm notification.

[0046] The use and setting process of the extreme temperature alarm system is as follows: Press the "Set button" to enter the temperature control upper limit temperature value setting mode, and set the upper limit temperature value through specific operations (such as increase and decrease buttons, etc.). After pressing the "Set button" again, the system enters the normal working mode. At this time, the 4-digit digital tube begins to display the ambient temperature, and the system enters the armed state. After entering the armed state, the green light flashes 10 times as a prompt. During the armed period, if the temperature detected by the DS18B20 temperature sensor exceeds the set limit temperature or the smoke sensor detects smoke: the extreme temperature alarm system automatically starts the sound and light alarm, the buzzer sounds, and the indicator light lights up to attract the attention of the surrounding personnel. At the same time, the GSM SMS module is triggered to send a mobile phone SMS alarm to the user, informing that the temperature exceeds the limit and reminding the user to deal with it in time.

[0047] Both the temperature monitoring and management system and the danger alarm management system involve single-chip microcomputers. In a specific embodiment, the two can share the same single-chip microcomputer or use different single-chip microcomputers independently.

[0048] The battery performance under extreme temperature conditions is greatly affected by the temperature, and only professionals know the changing rules of battery performance, while ordinary users of electric bicycles are not very clear. Therefore, the present invention provides an intelligent evaluation management system that can provide more convenient, scientific, reasonable, safe and effective usage suggestions for electric bicycle users. The intelligent evaluation management system can be installed on a user terminal (such as a mobile phone).

[0049] Intelligent evaluation and management system, used to provide users with battery safety recommendations.

[0050] The intelligent assessment management system includes: Initialize the setting module to set the current temperature value and the battery performance parameters under the current temperature conditions, including current power, estimated distance, estimated speed, battery voltage, battery capacity, and motor power; The battery life estimation module calculates the battery life of the electric vehicle under the current temperature conditions based on the parameters set by the initialization setting module and the extreme temperature influence factor; The battery usage recommendation module provides safe usage recommendations based on the estimated battery life results, including thermal management temperature control recommendations and optimal battery life.

[0051] The calculation formula for the endurance of an electric vehicle is: Power battery endurance = battery voltage × battery capacity × electric vehicle speed ÷ motor power × extreme temperature impact factor, where the extreme temperature impact factor is obtained by analyzing a large amount of battery performance experimental data under different temperatures.

[0052] In one embodiment, the intelligent assessment management system is implemented based on the WeChat applet, which is light and convenient. Figure 8As shown. Each page has a clear focus, so that users can quickly understand the page content every time they enter a new page to avoid other interference factors that are not related to the user's decision and operation. All pages will have a navigation bar provided by WeChat, which uniformly solves the problem of where you are and how to go back. WeChat's hierarchical navigation maintains a consistent experience, which helps users form a unified experience and interactive cognition within WeChat, without adding learning costs or changing usage habits when switching between various mini-programs and other WeChat pages. This program is mainly aimed at the relevant calculations involved in the temperature control / range analysis of electric bicycle batteries. The main functional modules are as follows Fig. 9 As shown, there are specific initialization settings area, battery life estimation area and battery health usage recommendation area.

[0053] Initialize the settings area: Battery model: battery voltage 48V, battery capacity 20AH; Motor power: 400W; Case (1): The local ambient temperature is 30°C; the current battery charge is 50%; the user's estimated driving distance is 50 km and the estimated driving speed is 25 km / h. The input parameters in the initialization setting area are as follows: Fig. 9 shown.

[0054] Case (2): The local ambient temperature is -10℃; the current battery charge is 50%; the user's estimated driving distance is 50km and the estimated driving speed is 25km / h. The input parameters in the initialization setting area are as follows: Fig.10 shown.

[0055] Estimated battery life range: When the parameters in the initialization area are initialized, click the "Battery Life Estimation" button or the hand icon, such as Fig.11 As shown, the battery life estimate is completed.

[0056] After initializing the parameters in the above cases (1) and (2), we can obtain Fig.12 and Fig.13 Battery life estimates shown.

[0057] Battery health usage suggestions area: After estimating the battery life, click the "Battery Usage Suggestions" button or the hand-shaped icon near it, such as Fig.14 for battery usage recommendations.

[0058] First, based on the needs of electric vehicle users, combined with battery vehicle performance parameters and local environmental factors, the current battery life is calculated; then, the minimum value of the electric vehicle's charge required to meet user needs under the current ambient temperature conditions is calculated. Secondly, to avoid the impact of excessively high or low ambient temperatures, the program gives the recommended temperature for scientific thermal management of electric vehicles; finally, the electric vehicle's endurance value at the recommended temperature is calculated.

[0059] For the above cases (1) and (2), we can obtain Fig.15 and Fig.16 Results of battery usage recommendations shown.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A dual-effect thermal management system for a power battery box, characterized in that: include: The heat pipe heat exchanger includes a planar heat pipe heat exchanger and an external environment heat exchanger. The planar heat pipe heat exchanger is arranged in the power battery box and is close to the surface of the power battery, and is used to absorb heat or cold from the power battery; the external environment heat exchanger is arranged outside the power battery box, and is connected to the planar heat pipe heat exchanger, and is used to release heat or cold to the external environment; The temperature monitoring and management system performs temperature monitoring and control operations on the environment inside the power battery box, sets the upper and lower limits of the temperature, and thus ensures that the ambient temperature inside the battery box is within the range defined by the upper and lower limits; The hazard alarm management system sets a limit temperature value, and when the ambient temperature inside the power battery box reaches the limit temperature value, an alarm signal is issued; Intelligent evaluation and management system, used to provide users with battery safety recommendations.

2. A dual-effect thermal management system for a power battery box according to claim 1, characterized in that: The planar heat pipe heat exchanger is a planar structure composed of a plurality of first heat pipes. The planar heat pipe heat exchanger is in a rectangular shape as a whole, and the plurality of first heat pipes are arranged in a mesh-like fractal shape imitating plant veins inside the rectangle.

3. A dual-effect thermal management system for a power battery box according to claim 1, characterized in that: The external environment heat exchanger is composed of a plurality of independent second heat pipes.

4. A dual-effect thermal management system for a power battery box according to claim 1 or 3, characterized in that: The external environment heat exchanger is arranged close to the outer surface of the battery box.

5. A dual-effect thermal management system for a power battery box according to claim 1, characterized in that: The temperature monitoring and management system includes a single-chip microcomputer, multiple temperature sensors, a heating device and a cooling device. The multiple temperature sensors are arranged inside the power battery box and are connected to the single-chip microcomputer through a first signal processing circuit. The single-chip microcomputer is connected to a temperature setting module and is respectively connected to the heating device and the cooling device through relays in a PID control manner. The temperature sensor monitors the ambient temperature inside the power battery box, and the monitored temperature value is transmitted to the single-chip microcomputer. The single-chip microcomputer calculates the upper and lower limits set by the temperature setting module through a PID control algorithm. If the monitored temperature is lower than the lower limit, the heating device is controlled to start through a relay. If it is higher than the upper limit, the cooling device is controlled to start through a relay.

6. A dual-effect thermal management system for a power battery box according to claim 5, characterized in that: The heating device is a heating film, and the cooling device is a fan.

7. A dual-effect thermal management system for a power battery box according to claim 1, characterized in that: The hazard alarm management system includes a single-chip microcomputer, a high-temperature sensor, a smoke sensor, and an alarm device; there are multiple high-temperature sensors and smoke sensors, which are arranged in a power battery box, and the high-temperature sensor and the smoke sensor are connected to the single-chip microcomputer through a second signal processing circuit, and the single-chip microcomputer is connected to the alarm device. At the same time, the single-chip microcomputer is also connected to a reset circuit, a clock circuit, and a limit temperature setting module; the limit temperature setting module is used to set the limit temperature value. When the temperature detected by the high-temperature sensor exceeds the limit temperature value or the smoke sensor detects smoke, the single-chip microcomputer will trigger the alarm device to sound an alarm.

8. A dual-effect thermal management system for a power battery box according to claim 7, characterized in that: The alarm device comprises: The indicator light is connected to the single-chip microcomputer through the first current-limiting resistor, and when the alarm is triggered, the indicator light is lit or flashed to intuitively display the alarm information to the user; The buzzer is connected to the single-chip computer through the second current-limiting resistor, and plays the role of a sound alarm by making a sound when the alarm is triggered; The GSM SMS module is connected to the microcontroller through serial communication and connected to the user terminal through the GSM network. When the alarm is triggered, the GSM SMS module sends a text message containing alarm information to the pre-set user terminal to realize remote alarm notification.

9. A dual-effect thermal management system for a power battery box according to claim 1, characterized in that: The intelligent assessment management system comprises: Initialize the setting module to set the current temperature value and the battery performance parameters under the current temperature conditions, including current power, estimated distance, estimated speed, battery voltage, battery capacity, and motor power; The battery life estimation module calculates the battery life of the electric vehicle under the current temperature conditions based on the parameters set by the initialization setting module and the extreme temperature influence factor; The battery usage recommendation module provides battery safety usage recommendations based on the battery life estimation results, including thermal management temperature control recommendations and optimal battery life.

10. A dual-effect thermal management system for a power battery box according to claim 9, characterized in that: The calculation formula for the electric vehicle's endurance value is: power battery endurance = battery voltage × battery capacity × electric vehicle speed ÷ motor power × extreme temperature impact factor, wherein the extreme temperature impact factor is obtained by analyzing a large amount of battery performance experimental data under different temperatures.

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