New energy automobile battery temperature control system

Abstract

The invention provides a new energy automobile battery temperature control system which comprises a battery pack, a battery pack, a liquid cooling pipeline, a backflow pipeline, an expansion water tank, a first circulating pump, a heat exchange body, a second circulating pump, a heat pump system, a resistance heater and a PTC heater. The battery pack is arranged in an inner cavity of the battery pack, the liquid cooling pipeline and the backflow pipeline are both located in the inner cavity of the battery pack and surround the battery pack, and a temperature sensor is arranged in the inner cavity of the battery pack; the liquid cooling pipeline and the backflow pipeline are provided with a plurality of branches, and each branch is provided with a temperature sensor. A three-way valve is arranged at one end of the liquid cooling pipeline and one end of the backflow pipeline; the liquid cooling pipeline is connected with the first circulating pump and penetrates through the heat exchange body to form a circulating loop with the expansion water tank, the heat exchange body is connected with the second circulating pump, the other end of the backflow pipeline is connected with the heat pump system, the other end of the heat pump system is connected with the PTC heater, and one end of the first circulating pump is connected with the resistance heater.

Description

Technical Field

[0001] The invention belongs to the field of temperature control, and in particular relates to a new energy vehicle battery temperature control system. Background Art

[0002] With the global emphasis on environmental protection and sustainable development, the development of new energy vehicles has ushered in unprecedented opportunities. As the core component of new energy vehicles, the performance of batteries directly affects the vehicle's endurance, safety and service life. Therefore, the research and application of battery temperature control systems has become particularly important. Batteries generate heat during charging and discharging. If the temperature is too high, it will cause battery performance to decline, shorten life, and even cause safety accidents. However, the current battery temperature control technology still has some defects and needs to be improved urgently.

[0003] Traditional battery temperature control systems often rely on passive heat dissipation technology, such as using heat sinks or natural convection to adjust battery temperature. This passive heat dissipation method is often difficult to effectively reduce battery temperature in high temperature environments or high-power discharge conditions, resulting in battery overheating, which in turn affects performance and safety. In addition, the existing passive heat dissipation technology lacks specificity in design and application, and is difficult to adapt to the needs of different models and battery packs, limiting its widespread application. Although some battery temperature control systems use active cooling technology, such as fans and liquid cooling, they often have problems with excessive energy consumption and system complexity in actual applications. Active cooling systems require additional energy support, which to a certain extent reduces the energy efficiency of the entire vehicle and increases the weight and cost of the vehicle. At the same time, complex cooling systems also increase the possibility of failure, bringing challenges to maintenance. In addition, existing temperature monitoring technologies are also insufficient in accuracy and real-time performance. The temperature sensors used in many systems have a long response time and cannot reflect the temperature changes of the battery in a timely manner, resulting in the control system being unable to effectively adjust the temperature in real time. This lag may cause the battery temperature to be too high at critical moments, affecting safety.

[0004] Existing battery management systems (BMS) generally lack intelligence and adaptive capabilities. Under different working environments and usage conditions, the temperature control requirements of the battery may vary, but many systems are unable to dynamically adjust the control strategy based on real-time data, resulting in poor temperature control effects. Current battery temperature control systems often fail to fully utilize big data and artificial intelligence technologies, lack in-depth analysis of battery usage status and environmental changes, and cannot achieve more efficient temperature management.

[0005] With the continuous advancement of battery technology, especially the emergence of solid-state batteries and high-energy density batteries, higher requirements are placed on battery temperature control systems. Existing temperature control technologies need to be continuously updated to adapt to the characteristics and requirements of new batteries. In order to improve the safety and performance of new energy vehicles, it is particularly important to develop an efficient and intelligent battery temperature control system. The system should combine advanced temperature monitoring technology with active cooling technology to ensure that the optimal operating temperature of the battery can be effectively maintained under various working conditions. At the same time, combined with big data analysis and artificial intelligence technology, real-time monitoring and intelligent regulation of battery status can be achieved to improve the accuracy and response speed of temperature control. This will provide strong support for the sustainable development of new energy vehicles and ensure that users have a good user experience. Summary of the invention

[0006] The present invention proposes a battery temperature control system for new energy vehicles. Because the current traditional battery temperature control methods mostly rely on passive heat dissipation and simple cooling systems, it is difficult to achieve accurate temperature control and effective thermal management. To address this problem, the battery temperature control system for new energy vehicles uses liquid cooling technology, heat pump systems and multiple heating methods to achieve accurate regulation of battery temperature, solving the shortcomings of traditional technologies in temperature management.

[0007] The technical solution of the present invention is implemented as follows: a new energy vehicle battery temperature control system, including a battery pack, a battery pack, a liquid cooling pipe, a return pipe, an expansion water tank, a first circulation pump, a heat exchanger, a second circulation pump, a heat pump system, a resistance heater and a PTC heater; the battery pack is in the inner cavity of the battery pack, the liquid cooling pipe and the return pipe are both located in the inner cavity of the battery pack and are arranged around the battery pack, and a temperature sensor is arranged in the inner cavity of the battery pack; the liquid cooling pipe and the return pipe are provided with a plurality of branches, each of which is respectively provided with a temperature sensor; a three-way valve is provided at one end of the liquid cooling pipe and one end of the return pipe; the liquid cooling pipe is connected to the first circulation pump and passes through the heat exchanger and the expansion water tank structure. A circulation loop is formed, the heat exchanger is connected to the second circulation pump, the other end of the return pipe is connected to the heat pump system, the other end of the heat pump system is connected to the PTC heater, and one end of the first circulation pump is connected to the resistance heater; the heat pump system is also provided with a temperature sensor; the first circulation pump, the second circulation pump, the resistance heater, the PTC heater, the heat pump system and the temperature sensor are connected to the controller signal, and the controller is connected to the display device signal; when the battery is running, the controller adjusts the working state of the first circulation pump, the second circulation pump, the resistance heater, the PTC heater and the heat pump system according to the data collected by each temperature sensor, so that the data collected by each temperature sensor is within a preset range.

[0008] The battery temperature control system of new energy vehicles plays a vital role in ensuring safety, extending battery life and improving overall performance. With the rapid development of the electric vehicle market, the demand for battery temperature control technology is growing, especially in high-power, high-energy density battery systems, where temperature management directly affects battery safety and performance.

[0009] First, the system introduces liquid cooling pipes and return pipes to form an efficient cooling cycle. Compared with traditional air cooling or simple liquid cooling systems, the liquid cooling system can remove the heat from the battery pack more evenly and effectively, significantly reduce the operating temperature of the battery, improve the charging and discharging efficiency, and avoid performance degradation or safety hazards caused by overheating. By setting multiple temperature sensors on the liquid cooling pipes and return pipes, the system can monitor the temperature distribution of the battery in real time to ensure that the temperature of each part is within a safe range, thereby improving the safety and reliability of the battery.

[0010] Secondly, the application of heat pump technology in the system makes temperature control more flexible and efficient. The heat pump system can not only provide heating when the battery temperature is too low to help the battery quickly reach the optimal operating temperature, but also reduce the battery temperature through the refrigeration function when the temperature is too high. This two-way adjustment capability significantly improves the adaptability of the battery under different environmental conditions, especially in cold or hot weather, to ensure that the battery is always in the best working state. Compared with the traditional single cooling or heating method, the system's comprehensive regulation ability is more prominent and can meet the temperature management needs under different working conditions. In addition, the system's controller is connected to the signals of various temperature sensors, pumps, heaters, and heat pumps, so that the entire temperature control process can be managed intelligently. The controller adjusts the working status of each component in time according to the real-time temperature data collected to ensure that the temperature of the battery pack is always maintained within the preset range. This intelligent regulation method not only improves the automation level of the system, but also reduces the need for manual operation and reduces the operation risk.

[0011] Compared with traditional temperature control methods, the system's intelligent adjustment capabilities make temperature management more efficient and precise, and can respond quickly based on real-time data, improving the overall performance and safety of the battery. Finally, the design of the temperature control system also takes into account energy efficiency and environmental performance. By optimizing the circulation of coolant and energy recovery of heat pumps, the system reduces energy consumption as much as possible while ensuring the battery temperature control effect.

[0012] As a preferred embodiment, it also includes a fan system, one end of the first circulation pump, one end of the second circulation pump and the other end of the heat pump system are all connected to the fan system; the fan system is connected to a controller; when the battery is running, the controller adjusts the working state of the fan system according to the temperature data collected by the heat pump system, so that the temperature data collected by the heat pump system is within a preset range.

[0013] As a preferred embodiment, it also includes a phase change material filling module, which is embedded in the inner cavity of the battery pack; the phase change material filling module is connected to the controller signal, and the temperature of the phase change material is controlled by the controller.

[0014] As a preferred embodiment, the operating conditions of the first circulation pump, the second circulation pump, the resistance heater, the PTC heater and the heat pump system are associated with the operating conditions of the controller and the battery pack; the temperature sensor, the second circulation pump, the first circulation pump and the heat exchanger constitute a liquid cooling circulation loop; the heat exchanger, the phase change material filling module, the second circulation pump and the resistance heater constitute a heating circulation loop; the heat exchanger, the resistance heater and the phase change material filling module constitute a liquid cooling circulation loop and a heating circulation loop in parallel; the battery pack and the battery group are heating objects.

[0015] As a preferred embodiment, a temperature control system is provided in the battery pack, and the operating mode of the battery pack is controlled by the temperature control system; the operating modes include heating mode, normal temperature mode and high temperature mode; in the heating mode, the controller controls the opening and closing of the heat pump system, the first circulation pump, the PTC heater and the second circulation pump, so that the temperature of the battery pack is maintained within a preset temperature range; in the normal temperature mode, the controller controls the second circulation pump, the first circulation pump and the phase change material filling module to work, so that the temperature of the battery pack is maintained within a preset temperature range; in the high temperature mode, the controller turns off the second circulation pump, the first circulation pump, the resistance heater and the PTC heater, and the controller controls the operation of the heat pump system, and the temperature of the battery pack is maintained within a preset temperature range.

[0016] After adopting the above technical solution, the beneficial effect of the present invention is: this design of integrating energy-saving and environmental protection concepts into the temperature management system conforms to the development trend of the current automobile industry and reflects the advantages of new energy vehicles in energy saving and environmental protection. In general, the new energy vehicle battery temperature control system effectively solves the shortcomings of traditional technology in temperature management through the comprehensive application of liquid cooling technology, heat pump system and intelligent control, improves the safety, performance and energy efficiency of the battery, and provides solid technical support for the further development of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 This is a system block diagram of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of 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.

[0020] Example:

[0021] like Figure 1 As shown, a new energy vehicle battery temperature control system includes a battery pack, a battery package, a liquid cooling pipe, a return pipe, an expansion water tank, a first circulation pump, a heat exchanger, a second circulation pump, a heat pump system, a resistance heater and a PTC heater; the battery pack is in the inner cavity of the battery pack, the liquid cooling pipe and the return pipe are both located in the inner cavity of the battery pack and are arranged around the battery pack, and a temperature sensor is arranged in the inner cavity of the battery pack; the liquid cooling pipe and the return pipe are provided with a plurality of branches, and each branch is respectively provided with a temperature sensor; a three-way valve is provided at one end of the liquid cooling pipe and one end of the return pipe; the liquid cooling pipe is connected to the first circulation pump, and passes through the heat exchanger and the expansion water tank to form a circulation loop, The heat exchanger is connected to the second circulation pump, the other end of the return pipe is connected to the heat pump system, the other end of the heat pump system is connected to the PTC heater, and one end of the first circulation pump is connected to the resistance heater; the heat pump system is also provided with a temperature sensor; the first circulation pump, the second circulation pump, the resistance heater, the PTC heater, the heat pump system and the temperature sensor are connected to the controller signal, and the controller is connected to the display device signal; when the battery is running, the controller adjusts the working status of the first circulation pump, the second circulation pump, the resistance heater, the PTC heater and the heat pump system according to the data collected by each temperature sensor, so that the data collected by each temperature sensor is within a preset range.

[0022] This technology describes a new energy vehicle battery temperature control system, the core of which is to achieve precise control of battery temperature through the coordinated work of multiple components to ensure that the battery can maintain the best working condition under various operating conditions. The following is a detailed description of the working principle and workflow of the system.

[0023] The system includes components such as battery pack, battery pack, liquid cooling pipe, return pipe, expansion tank, first circulation pump, heat exchanger, second circulation pump, heat pump system, resistance heater and PTC heater. The battery pack and battery pack are installed in the inner cavity of the battery pack, and the liquid cooling pipe and return pipe are arranged around the battery pack to ensure that the battery pack can be effectively cooled and heated during operation. Temperature sensors are installed in the inner cavity of the battery pack and on each branch pipe to monitor the temperature of the battery and coolant in real time.

[0024] A three-way valve is provided at one end of the liquid cooling pipe and the return pipe to control the flow direction of the coolant. The liquid cooling pipe is connected to the first circulation pump and forms a circulation loop with the expansion water tank through the heat exchange body. The heat exchange body is connected to the second circulation pump, and the other end of the return pipe is connected to the heat pump system, and the other end of the heat pump system is connected to the PTC heater. One end of the first circulation pump is connected to the resistance heater to heat the coolant when needed.

[0025] The heat pump system is also provided with a temperature sensor for monitoring the working status of the heat pump system. The first circulation pump, the second circulation pump, the resistance heater, the PTC heater, the heat pump system and the temperature sensor are all connected to the controller signal, and the controller is connected to the display device signal to ensure that the system can monitor and adjust the working status of each component in real time.

[0026] When the battery is running, the controller adjusts the working state of the first circulation pump, the second circulation pump, the resistance heater, the PTC heater and the heat pump system according to the data collected by each temperature sensor, so that the data collected by each temperature sensor is within the preset range. The specific operation steps are as follows:

[0027] Temperature data collection: After the system is started, each temperature sensor starts to collect temperature data of the battery pack, the inner cavity of the battery pack, the liquid cooling pipe, the return pipe and the heat pump system. These temperature data are transmitted to the controller through signals, and the controller analyzes and processes the data in real time.

[0028] Temperature control strategy formulation: The controller formulates the corresponding temperature control strategy based on the preset temperature range and the currently collected temperature data. If the battery temperature is too low, the controller will start the resistance heater and PTC heater to heat the coolant to increase the battery temperature. If the battery temperature is too high, the controller will start the first circulation pump and the second circulation pump to circulate the coolant to the heat exchanger through the liquid cooling pipe and the return pipe, and use the heat exchanger to dissipate heat and reduce the battery temperature.

[0029] Component working state adjustment: The controller adjusts the working state of the first circulation pump, the second circulation pump, the resistance heater, the PTC heater and the heat pump system according to the established temperature control strategy. For example, when the battery temperature is too low, the controller will start the resistance heater and the PTC heater to increase the temperature of the coolant; when the battery temperature is too high, the controller will start the first circulation pump and the second circulation pump to increase the circulation speed of the coolant and accelerate heat dissipation.

[0030] Real-time monitoring and feedback: The controller continuously monitors the data of each temperature sensor to ensure that the battery temperature is always within the preset range. If the temperature data deviates from the preset range, the controller will immediately adjust the working status of each component to restore the stability of the battery temperature.

[0031] System optimization and adjustment: During battery operation, the controller continuously optimizes the temperature control strategy based on real-time data to ensure that the system can operate efficiently and stably. For example, when the battery temperature gradually rises, the controller can gradually increase the operating frequency of the first circulation pump and the second circulation pump to improve the heat dissipation efficiency; when the battery temperature gradually decreases, the controller can gradually reduce the working intensity of the resistance heater and the PTC heater to avoid overheating.

[0032] It also includes a fan system, one end of the first circulation pump, one end of the second circulation pump and the other end of the heat pump system are all connected to the fan system; the fan system is connected to a controller; when the battery is running, the controller adjusts the working state of the fan system according to the temperature data collected by the heat pump system, so that the temperature data collected by the heat pump system is within a preset range.

[0033] The main difference between the above technical solution and the prior art is that it introduces a fan system and dynamically adjusts the working state of the fan system through a controller to ensure that the temperature data of the heat pump system is always within the preset range. In the prior art, the battery temperature control system often lacks a direct monitoring and adjustment mechanism for the temperature of the heat pump system, resulting in insufficient heat dissipation efficiency of the heat pump system in a high temperature environment, affecting the stability and performance of the entire system. However, this technical solution significantly improves the heat dissipation capacity of the system through the introduction of a fan system, ensuring the stable operation of the heat pump system in a high temperature environment.

[0034] Specifically, the fan system is connected to the first circulation pump, the second circulation pump and the other end of the heat pump system, and is managed uniformly through the controller. During battery operation, the controller adjusts the working state of the fan system in real time based on the temperature data collected by the heat pump system. For example, when the temperature of the heat pump system rises, the controller will automatically increase the speed of the fan to improve the heat dissipation efficiency; when the temperature drops, the controller will reduce the speed of the fan accordingly to avoid unnecessary energy consumption. This dynamic adjustment mechanism enables the system to flexibly adjust the heat dissipation capacity according to actual needs, ensuring that the temperature of the heat pump system is always in the optimal working range.

[0035] In addition, the introduction of the fan system also enhances the overall heat dissipation effect of the system. Especially in high temperature environments, the fan system can effectively reduce the temperature of the heat pump system and prevent system failures caused by overheating. Compared with the common fixed heat dissipation method in the prior art, this design has higher flexibility and adaptability and can better cope with complex and changing environmental conditions.

[0036] This technical solution significantly improves the heat dissipation capacity and stability of the battery temperature control system by introducing a fan system and combining it with the dynamic adjustment function of the controller. Compared with the existing technology, this solution shows higher intelligence and efficiency in monitoring and adjusting the temperature of the heat pump system, providing a strong guarantee for the safe operation of new energy vehicle batteries.

[0037] It also includes a phase change material filling module, which is embedded in the inner cavity of the battery pack; the phase change material filling module is connected to the controller signal, and the temperature of the phase change material is controlled by the controller.

[0038] In the existing technology, battery temperature control systems often rely on traditional cooling and heating methods, lacking the ability to quickly respond to temperature changes and accurately control them, resulting in battery performance and life being affected under extreme temperature conditions. This technical solution significantly improves the system's temperature regulation capability and response speed by introducing a phase change material filling module.

[0039] Specifically, the phase change material filling module is embedded in the inner cavity of the battery pack and connected to the controller signal. The phase change material can undergo phase change at a specific temperature, absorbing or releasing a large amount of heat, thereby achieving rapid regulation of the battery temperature. The controller dynamically adjusts the working state of the phase change material based on the real-time temperature data of the battery to ensure that the battery temperature is always in the optimal working range. For example, when the battery temperature rises, the phase change material absorbs heat and undergoes phase change, lowering the battery temperature; when the battery temperature drops, the phase change material releases heat and returns to its original state, raising the battery temperature.

[0040] This temperature control method based on phase change materials has higher response speed and accuracy compared with the common coolant circulation and heater control in the prior art. Phase change materials can absorb or release a large amount of heat in a short period of time, effectively avoiding the temperature fluctuations and delays that may occur in traditional cooling and heating methods. In addition, the introduction of phase change materials also enhances the overall thermal management capabilities of the system, especially under extreme temperature conditions, which can better protect the battery and extend its service life.

[0041] The operating conditions of the first circulation pump, the second circulation pump, the resistance heater, the PTC heater and the heat pump system are associated with the operating conditions of the controller and the battery pack; the temperature sensor, the second circulation pump, the first circulation pump and the heat exchanger constitute a liquid cooling circulation loop; the heat exchanger, the phase change material filling module, the second circulation pump and the resistance heater constitute a heating circulation loop; the heat exchanger, the resistance heater and the phase change material filling module constitute a parallel circuit of a liquid cooling circulation loop and a heating circulation loop; the battery pack and the battery group are heating objects.

[0042] The main difference between the above technical solution and the prior art lies in its systematic circulation loop design and the collaborative working mechanism of multiple components, especially the parallel design of the liquid cooling circulation loop and the heating circulation loop, and the close connection between each component and the operating conditions of the controller and the battery pack. In the prior art, the battery temperature control system often adopts a single cooling or heating method, which lacks flexibility and adaptability, resulting in the system performance and stability being affected under different operating conditions. The present technical solution significantly improves the flexibility and adaptability of the system through the design of multiple circulation loops, ensuring that the battery can maintain the best working state under various operating conditions.

[0043] Specifically, the system includes a liquid cooling loop and a heating loop, which are connected in parallel. The liquid cooling loop consists of a temperature sensor, a second circulation pump, a first circulation pump, and a heat exchanger, which is responsible for cooling when the battery temperature is too high; the heating loop consists of a heat exchanger, a phase change material filling module, a second circulation pump, and a resistance heater, which is responsible for heating when the battery temperature is too low. This parallel design enables the system to flexibly switch cooling and heating modes under different temperature conditions to ensure that the battery temperature is always in the optimal operating range.

[0044] In addition, the operating conditions of the first circulation pump, the second circulation pump, the resistance heater, the PTC heater and the heat pump system are closely related to the operating conditions of the controller and the battery pack. The controller dynamically adjusts the working status of each component according to the real-time temperature data and operating status of the battery to ensure that the system can operate efficiently and stably. For example, when the battery temperature rises, the controller will start the liquid cooling circulation loop, increase the circulation speed of the coolant, and accelerate the heat dissipation; when the battery temperature drops, the controller will start the heating circulation loop, increase the working intensity of the heater, and increase the battery temperature.

[0045] This systematic cycle design and multi-component collaborative working mechanism has higher flexibility and adaptability compared to the single cooling or heating methods commonly used in existing technologies. The system can flexibly switch cooling and heating modes under different operating conditions to ensure that the battery temperature is always in the optimal operating range, thereby improving the performance and life of the battery.

[0046] A temperature control system is provided in the battery pack, and the operating mode of the battery pack is controlled by the temperature control system; the operating modes include heating mode, normal temperature mode and high temperature mode; in the heating mode, the controller controls the opening and closing of the heat pump system, the first circulation pump, the PTC heater and the second circulation pump, so that the temperature of the battery pack is maintained within a preset temperature range; in the normal temperature mode, the controller controls the second circulation pump, the first circulation pump and the phase change material filling module to work, so that the temperature of the battery pack is maintained within a preset temperature range; in the high temperature mode, the controller turns off the second circulation pump, the first circulation pump, the resistance heater and the PTC heater, and the controller controls the operation of the heat pump system, and the temperature of the battery pack is maintained within a preset temperature range.

[0047] The controller dynamically adjusts the components in different operating modes to ensure that the temperature of the battery pack is always within the preset range. In the prior art, the battery temperature control system often lacks the ability to flexibly switch and accurately control different operating modes, resulting in the battery performance and life being affected under different temperature conditions. This technical solution significantly improves the flexibility and adaptability of the system through a multi-mode temperature control system, ensuring that the battery can maintain the best working state under various operating conditions.

[0048] The battery pack is equipped with a temperature control system, which controls the operating modes of the battery pack, including heating mode, normal temperature mode and high temperature mode. In heating mode, the controller dynamically adjusts the working status of the heat pump system, the first circulation pump, the PTC heater and the second circulation pump according to the real-time temperature data of the battery to ensure that the temperature of the battery pack remains within the preset temperature range. For example, when the battery temperature is too low, the controller will start the heat pump system and the PTC heater to increase the working intensity of the heater and increase the battery temperature; at the same time, the controller will start the first circulation pump and the second circulation pump to increase the circulation speed of the coolant and accelerate heat dissipation.

[0049] In normal temperature mode, the controller dynamically adjusts the working status of the second circulation pump, the first circulation pump and the phase change material filling module according to the real-time temperature data of the battery to ensure that the temperature of the battery pack remains within the preset temperature range. For example, when the battery temperature gradually rises, the controller will gradually increase the working frequency of the second circulation pump and the first circulation pump to improve the heat dissipation efficiency; when the battery temperature gradually decreases, the controller will gradually reduce the working intensity of the phase change material filling module to avoid overheating.

[0050] In high temperature mode, the controller turns off the second circulation pump, the first circulation pump, the resistance heater and the PTC heater, and only controls the operation of the heat pump system to ensure that the temperature of the battery pack remains within the preset temperature range. For example, when the battery temperature is too high, the controller will start the heat pump system to increase the heat dissipation efficiency and reduce the battery temperature; at the same time, the controller will turn off other heating and cooling components to avoid unnecessary energy consumption.

[0051] This multi-mode temperature control system has higher flexibility and adaptability compared to the single temperature control method commonly used in existing technologies. The system can flexibly switch between different operating modes under different temperature conditions to ensure that the battery temperature is always in the optimal operating range, thereby improving the performance and life of the battery.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A new energy vehicle battery temperature control system, characterized in that: The invention comprises a battery pack, a battery package, a liquid cooling pipe, a return pipe, an expansion water tank, a first circulation pump, a heat exchanger, a second circulation pump, a heat pump system, a resistance heater and a PTC heater; the battery pack is installed in the inner cavity of the battery pack, the liquid cooling pipe and the return pipe are both located in the inner cavity of the battery pack and are arranged around the battery pack, and a temperature sensor is arranged in the inner cavity of the battery pack; the liquid cooling pipe and the return pipe are provided with a plurality of branches, and each branch is provided with a temperature sensor; a three-way valve is provided at one end of the liquid cooling pipe and one end of the return pipe; the liquid cooling pipe is connected to the first circulation pump, and passes through the heat exchanger and the expansion water tank to form a circulation loop, and the heat exchanger and the second The first circulating pump is connected to the heat pump system, the other end of the return pipe is connected to the heat pump system, the other end of the heat pump system is connected to the PTC heater, and one end of the first circulating pump is connected to the resistance heater; the heat pump system is also provided with a temperature sensor; the first circulating pump, the second circulating pump, the resistance heater, the PTC heater, the heat pump system and the temperature sensor are connected to the controller signal, and the controller is connected to the display device signal; when the battery is running, the controller adjusts the working state of the first circulating pump, the second circulating pump, the resistance heater, the PTC heater and the heat pump system according to the data collected by each temperature sensor, so that the data collected by each temperature sensor is within a preset range.

2. A new energy vehicle battery temperature control system as claimed in claim 1, characterized in that: It also includes a fan system, one end of the first circulation pump, one end of the second circulation pump and the other end of the heat pump system are all connected to the fan system; the fan system is connected to a controller; when the battery is running, the controller adjusts the working state of the fan system according to the temperature data collected by the heat pump system, so that the temperature data collected by the heat pump system is within a preset range.

3. A new energy vehicle battery temperature control system as claimed in claim 1, characterized in that: It also includes a phase change material filling module, which is embedded in the inner cavity of the battery pack; the phase change material filling module is connected to the controller signal, and the temperature of the phase change material is controlled by the controller.

4. A new energy vehicle battery temperature control system as claimed in claim 3, characterized in that: The operating conditions of the first circulation pump, the second circulation pump, the resistance heater, the PTC heater and the heat pump system are associated with the operating conditions of the controller and the battery pack; the temperature sensor, the second circulation pump, the first circulation pump and the heat exchanger constitute a liquid cooling circulation loop; the heat exchanger, the phase change material filling module, the second circulation pump and the resistance heater constitute a heating circulation loop; the heat exchanger, the resistance heater and the phase change material filling module constitute a parallel circuit of a liquid cooling circulation loop and a heating circulation loop; the battery pack and the battery group are heating objects.

5. A new energy vehicle battery temperature control system as claimed in claim 3, characterized in that: A temperature control system is provided in the battery pack, and the operating mode of the battery pack is controlled by the temperature control system; the operating modes include heating mode, normal temperature mode and high temperature mode; in the heating mode, the controller controls the opening and closing of the heat pump system, the first circulation pump, the PTC heater and the second circulation pump, so that the temperature of the battery pack is maintained within a preset temperature range; in the normal temperature mode, the controller controls the second circulation pump, the first circulation pump and the phase change material filling module to work, so that the temperature of the battery pack is maintained within a preset temperature range; in the high temperature mode, the controller turns off the second circulation pump, the first circulation pump, the resistance heater and the PTC heater, and the controller controls the operation of the heat pump system, and the temperature of the battery pack is maintained within a preset temperature range.

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