Double-loop energy storage temperature control system and method

Abstract

The invention discloses a double-loop energy storage temperature control system and method, and relates to the technical field of heat management of energy storage systems. The system comprises a first heat management loop, a second heat management loop and a temperature control loop, the second thermal management loop is used for adjusting the temperature of the converter; the first heat exchange component is arranged between the first heat management loop and the second heat management loop and is used for realizing non-contact heat exchange between the first heat management loop and the second heat management loop; the first flow path switching element is used for establishing or disconnecting a first non-contact heat exchange path passing through the first heat exchange component; the control unit is used for performing coordinated control on the operation states of the first thermal management loop and the second thermal management loop based on the environment temperature in combination with the target temperatures of the battery unit and the converter; wherein the target temperature of the battery unit is lower than the target temperature corresponding to the converter. By adopting the system, the differentiated collaborative temperature control of the battery unit and the converter can be realized under different environment temperature conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal management of energy storage systems, and particularly relates to a dual-loop energy storage temperature control system and method. BACKGROUND

[0002] With the development of electrochemical energy storage power stations in the direction of large-scale and centralization, the heat generated by the energy storage battery cluster and the energy storage converter in the operation process of the energy storage system gradually increases, and the thermal management performance directly affects the cycle life, energy conversion efficiency, safety and reliability, and overall operating cost of the system. In the related art, large-scale energy storage systems usually use a centralized single liquid cooling system to uniformly regulate the temperature of the battery cluster and the energy storage converter. However, due to the significant differences in structural characteristics, working mechanism and temperature resistance between the energy storage battery and the energy storage converter, their suitable working temperature ranges are not consistent, and a single thermal management system is difficult to meet the differentiated and refined temperature control requirements of both in actual application, which may cause problems such as battery overcooling or converter cooling redundancy under certain working conditions.

[0003] On the other hand, in order to meet the cooling requirements of the battery under high load or high ambient temperature conditions, the single refrigeration system usually selects the capacity according to the peak working condition. When operating under medium or low load or low ambient temperature, the refrigeration device is in a low-efficiency operation state for a long time, resulting in a low overall energy efficiency ratio of the system and increasing the operating energy consumption of the energy storage power station. At the same time, the energy storage converter continuously generates a large amount of waste heat during operation, and the battery often needs additional heating measures to maintain performance and safety under low temperature environment. Therefore, the thermal management scheme in the related art is difficult to uniformly distribute and effectively utilize the above-mentioned heat, and often relies on additional electric heating devices, resulting in energy waste. In addition, when the single thermal management loop fails, the temperature control function of the battery and the converter may be affected, and the overall reliability and operating flexibility of the system are limited, which is difficult to adapt to the long-term stable operation requirements under multi-working condition and multi-load conditions. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, the purpose of the present application is to propose a dual-loop energy storage temperature control system and method to realize differentiated temperature regulation of battery cells and converters and coordinated control of operating states.

[0005] To achieve the above-mentioned purpose, the first aspect of the present application proposes a dual-loop energy storage temperature control system, comprising: a first thermal management loop for temperature regulation of battery cells; a second thermal management loop for temperature regulation of converters; a first heat exchange component disposed between the first thermal management circuit and the second thermal management circuit, configured to realize non-contact heat exchange between the first thermal management circuit and the second thermal management circuit; a first flow path switching element configured to establish or disconnect a first non-contact heat exchange path of the first thermal management circuit and the second thermal management circuit via the first heat exchange component; a control unit electrically connected with the first thermal management circuit, the second thermal management circuit and the first flow path switching element, respectively, configured to coordinate control the operation states of the first thermal management circuit and the second thermal management circuit based on an external environment temperature and in combination with target temperatures of the battery unit and the converter; wherein the target temperature of the battery unit is lower than the corresponding target temperature of the converter.

[0006] In addition, the system of the above-mentioned embodiments of the present application can also have the following additional technical features: According to an embodiment of the present application, the first thermal management circuit comprises a first temperature adjusting device, the first temperature adjusting device comprises a first active refrigeration device, a first cooler and a heater; the first active refrigeration device performs non-contact heat exchange on the cooling medium in the first thermal management circuit through a second heat exchange component in communication with the first thermal management circuit; the first cooler is configured to passively dissipate heat for the battery unit when the first active refrigeration device is turned off; and the heater is configured to assist in heating the battery unit when the first thermal management circuit recovers insufficient heat. The second thermal management circuit comprises a second temperature adjusting device, the second temperature adjusting device comprises a second active refrigeration device and a second cooler; the second active refrigeration device performs non-contact heat exchange on the cooling medium in the second thermal management circuit through a third heat exchange component in communication with the second thermal management circuit; and the second cooler is configured to passively dissipate heat for the converter when the second active refrigeration device is turned off. wherein the first active refrigeration device and the second active refrigeration device are two sets of physically isolated refrigeration devices, and the control unit independently controls the operating parameters of the first active refrigeration device and the second active refrigeration device.

[0007] According to an embodiment of the present application, the first thermal management circuit further comprises a second flow path switching element, the second flow path switching element is configured to establish or disconnect a second non-contact heat exchange path of the cooling medium of the first thermal management circuit and the refrigeration medium of the first active refrigeration device; The second thermal management circuit also includes a third flow path switching element, which is used to establish or disconnect a third non-contact heat exchange path between the cooling medium of the second thermal management circuit and the cooling medium of the second active cooling device.

[0008] According to one embodiment of the present invention, the control unit is configured to: When the ambient temperature is lower than the first preset value and the battery cell generates a heating request, the first active cooling device and the second active cooling device are turned off, and the second thermal management circuit dissipates heat through the second cooler. The first flow path switching element is controlled to establish the first non-contact heat exchange path, so that the heat recovered in the second thermal management circuit is transferred to the first thermal management circuit for heating the battery cell.

[0009] According to one embodiment of the present invention, the control unit is configured to: if the temperature rise rate of the battery cell is detected to be lower than a set threshold, then activate the heater to provide auxiliary heating to the battery cell.

[0010] According to one embodiment of the present invention, the control unit is configured to: When the ambient temperature is lower than the first preset value and the battery cell generates a cooling request, the first flow path switching element is controlled to disconnect the first non-contact heat exchange path, shut down the first active cooling device and the second active cooling device, and dissipate heat through the first cooler and the second cooler respectively.

[0011] According to one embodiment of the present invention, the control unit is configured to: When the ambient temperature is higher than the first preset value and lower than the second preset value, and the battery cell generates a cooling request, the first flow path switching element is controlled to disconnect the first non-contact heat exchange path and the first active cooling device is activated, so that the first thermal management circuit can be cooled through non-contact heat exchange between the first active cooling devices. The second active cooling device is turned off, allowing the second thermal management circuit to dissipate heat through the second cooler.

[0012] According to one embodiment of the present invention, the control unit is configured to: When the ambient temperature is higher than or equal to the second preset value and the battery cell generates a cooling request, the first flow path switching element is controlled to disconnect the first non-contact heat exchange path. The first active cooling device is activated, so that the first thermal management circuit can be cooled through non-contact heat exchange between the first active cooling devices. The second active cooling device is activated, enabling the second thermal management circuit to cool through non-contact heat exchange between the second active cooling devices.

[0013] According to one embodiment of the present invention, the control unit is configured to: When the first active cooling device or the second active cooling device malfunctions, the temperature control device on the thermal management circuit where the malfunctioning active cooling device is located is shut down. The first flow path switching element is controlled to establish the first non-contact heat exchange path, and based on the ambient temperature and the target temperatures of the battery cell and the converter, the operating status of the thermal management loop where the active cooling device without faults is located is coordinated and controlled to maintain the battery cell and the converter at their respective target temperatures.

[0014] To achieve the above objectives, a second aspect of the present invention provides a dual-loop energy storage temperature control method, applied to a dual-loop energy storage temperature control system, the method comprising: Obtain the external ambient temperature; Based on the external ambient temperature and the target temperatures corresponding to the battery cell and the inverter, the operating modes of the first thermal management circuit and the second thermal management circuit are determined. Based on the operating modes of the first thermal management circuit and the second thermal management circuit, the working states of the first thermal management circuit and the second thermal management circuit are coordinated and controlled to achieve temperature regulation of the battery cell and the inverter. The target temperature of the battery cell is lower than the target temperature of the inverter.

[0015] The dual-loop energy storage temperature control system and method of this invention sets up independent temperature control loops and corresponding cooling systems with different target temperatures for the converter and battery, and coordinates the operation modes of each loop in combination with ambient temperature and load requirements. This enables the converter cooling loop and battery cooling loop to operate in a more matched temperature regulation mode within the main ambient temperature range throughout the year, thereby avoiding the problem of a single cooling system being in a low-efficiency state for a long time due to taking into account the needs of different temperature zones, and significantly reducing the overall energy consumption of the system.

[0016] Meanwhile, this invention enables the recovery of waste heat from converter operation and its application to battery heating through controllable heat exchange between circuits under low-temperature conditions. This reduces the use of electric heaters while ensuring battery temperature control requirements, thereby improving the overall energy efficiency, operational reliability, and adaptability to different climatic environments of the energy storage temperature control system from the perspectives of system structure and operation strategy. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall architecture of a dual-loop energy storage temperature control system in one embodiment; Figure 2 This is a schematic diagram of the medium flow direction in a dual-loop energy storage temperature control system under low-temperature heating mode in one embodiment; Figure 3 This is a schematic diagram of the medium flow direction of a dual-loop energy storage temperature control system in a low-temperature air-liquid cooling mode in one embodiment; Figure 4 This is a schematic diagram of the medium flow direction of a dual-loop energy storage temperature control system in a medium-low temperature cooling mode in one embodiment; Figure 5 This is a schematic diagram of the medium flow direction of a dual-loop energy storage temperature control system in a medium-high temperature cooling mode in one embodiment; Figure 6 This is a flowchart illustrating a dual-loop energy storage temperature control method in one embodiment.

[0018] Reference numerals: 1. First heat exchange component; 2. First flow path switching element; 3. Ambient temperature sensor; 4. Control unit; 5. Water pump; 6. Inlet water temperature sensor; 7. Outlet water temperature sensor; 10. First thermal management loop; 101. First active cooling device; 102. First cooler; 103. Heater; 104. Second flow path switching element; 105. Second thermal management loop; 20. Second active cooling device; 201. Second cooler; 202. Third flow path switching element; 203. Third heat exchange component; 204. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] The implementation details of the technical solutions of the embodiments of the present invention are described in detail below.

[0021] Figure 1 A schematic diagram of the overall architecture of a dual-loop energy storage temperature control system is provided. Figure 1 As shown, this dual-loop energy storage temperature control system is used to regulate the temperature of different heat load units. The system as a whole includes a first thermal management loop 10 for regulating the temperature of the battery units and a second thermal management loop 20 for regulating the temperature of the inverter. Through corresponding heat exchange and flow path control structures, the two thermal management loops can operate collaboratively under different operating conditions. The following will combine... Figure 1 The following is a further explanation of the components and working methods of the dual-loop energy storage temperature control system of the present invention.

[0022] The first thermal management circuit 10 is used to regulate the temperature of the battery cell. The battery cell typically generates heat continuously during charging and discharging, and its temperature regulation requirements vary under different environmental conditions. Cooling is required under most operating conditions, while heating is required under certain conditions. The first thermal management circuit 10 forms a closed heat transfer channel surrounding the battery cell. A circulating cooling medium fluid passage and a water pump 5 are installed within the circuit to drive the cooling medium to circulate within the circuit. The cooling medium circulates within the circuit and exchanges heat with the heat exchange interface of the battery cell, thereby removing the heat generated during battery cell operation or transferring heat to the battery cell when needed, thus regulating the battery cell temperature.

[0023] The second thermal management loop 20 is used to regulate the temperature of the converter. The converter continuously generates heat during operation, requiring cooling. The second thermal management loop 20 forms a closed-loop heat transfer channel for the converter. The loop includes a fluid passage for circulating the cooling medium and a water pump 5 to drive the cooling medium to circulate within the loop. The cooling medium circulates within the loop and exchanges heat with the converter's heat exchange interface to effectively remove the heat generated by the converter, thus regulating its temperature.

[0024] The first heat exchange component 1 is disposed between the first thermal management circuit 10 and the second thermal management circuit 20, serving as a heat exchange unit between the two circuits. It is used to realize non-contact heat transfer between the two thermal management circuits when the first thermal management circuit 10 and the second thermal management circuit 20 circulate cooling media independently.

[0025] In practical applications, the first thermal management loop 10 is used to regulate the temperature of the battery cell, with a relatively low target temperature; the second thermal management loop 20 is used to regulate the temperature of the converter cell, with a relatively high target temperature. Since the converter continuously generates a high level of waste heat during operation, and the battery cell has heating requirements under specific operating conditions, the two thermal management loops are complementary in terms of heat supply and demand.

[0026] Since the heat levels and temperature control requirements generated by the two thermal management circuits during operation are different, when the temperature of the cooling medium in the second thermal management circuit 20 is higher than that of the cooling medium in the first thermal management circuit 10, a controlled first non-contact heat transfer path can be established between the two circuits through the first heat exchange component 1, so that the excess heat in the second thermal management circuit 20 can be recovered and used for the first thermal management circuit 10, thereby achieving auxiliary heating of the battery cell without introducing additional heating energy consumption.

[0027] Specifically, such as Figure 1As shown, the first side of the first heat exchange component 1 is connected to the cooling medium flow channel in the first thermal management loop 10, and the second side is connected to the cooling medium flow channel in the second thermal management loop 20. This allows the cooling media from the two loops to exchange heat through the heat exchange wall within the first heat exchange component 1 without mixing. This non-contact heat exchange method avoids the risk of contamination between cooling media from different loops and ensures the structural and control logic independence of the two thermal management loops.

[0028] In engineering implementation, the first heat exchange component 1 can adopt a plate heat exchange structure, a shell-and-tube heat exchange structure, or other compact and efficient heat exchange structures to achieve high heat exchange efficiency within a limited installation space and meet the requirements for cooling medium pressure, flow rate, and durability. By setting the first heat exchange component 1, the first thermal management loop 10 and the second thermal management loop 20 are structurally independent while forming a controllable coupling at the thermal level, thereby improving the overall thermal management flexibility and energy efficiency of the system under different ambient temperatures and operating conditions.

[0029] The first flow path switching element 2 is disposed between the first thermal management loop 10 and the second thermal management loop 20, and is used to selectively construct a first non-contact heat exchange path through the first heat exchange component 1 between the two thermal management loops. By switching the flow direction and flow path of the cooling medium, the first flow path switching element 2 realizes the isolation of the first thermal management loop 10 and the second thermal management loop 20 at the fluid level and the controllable coupling at the thermal level.

[0030] When the first flow path switching element 2 is in the on state, the cooling medium in the first thermal management circuit 10 and the second thermal management circuit 20 is guided to the first heat exchange component 1, so that the cooling medium of the two circuits exchanges heat through the heat exchange wall in the first heat exchange component 1; when the first flow path switching element 2 is switched to the isolation state, the cooling medium on at least one side flows around the first heat exchange component 1, so that the heat exchange path between the two thermal management circuits is disconnected.

[0031] Through the above-mentioned flow path switching method, the first thermal management loop 10 and the second thermal management loop 20 can determine whether to transfer heat through the first heat exchange component 1 according to the system configuration, provided that the cooling medium does not mix. This ensures the independence of the two loops in terms of structure and fluid circuit, and provides basic path control conditions for heat recovery or heat isolation.

[0032] In engineering implementation, the first flow path switching element 2 can be a flow path switching structure formed by an electric three-way valve, a proportional regulating valve, or a combination of a two-way valve and a three-way valve, and is arranged at a pipe node near the first heat exchange component 1. For example, Figure 2The first flow path switching element 2 is an electrically operated three-way valve, comprising end A, end B, and end C. End B of the first flow path switching element 2 is the inflow end (common end) of the cooling medium in the first thermal management loop 10, while ends A and C are controlled selective outflow ends. End A is connected to the outlet port of the first thermal management loop 10, and end C is connected to the first heat exchange component 1. The first flow path switching element 2 establishes a first non-contact heat exchange path through ends B and C.

[0033] The control unit 4 is electrically connected to the first thermal management loop 10, the second thermal management loop 20, and the first flow path switching element 2, respectively, for unified coordination of the operating status of each thermal management component. This unified coordination is not merely independent control of a single loop, but rather a collaborative configuration of the operating strategies of multiple thermal management loops based on the differences in temperature requirements of different controlled objects.

[0034] Control unit 4 is configured to comprehensively judge and coordinate the cooling, refrigeration, heating, and heat exchange states of the first thermal management loop 10 and the second thermal management loop 20 based on the external ambient temperature and in conjunction with the pre-set target temperatures of the battery cells and the inverter. The target temperatures of the battery cells and the inverter correspond to their optimal operating temperature ranges, which are used to characterize the essential differences between the two types of loads in terms of safety, lifespan requirements, and heat dissipation tolerance. The battery cells typically have a narrower and lower target temperature range, while the inverter is allowed to operate stably in a higher temperature range.

[0035] Based on the aforementioned target temperature differences, the control unit 4 sets different temperature control priorities and adjustment strategies for the first thermal management loop 10 and the second thermal management loop 20 under the same ambient temperature conditions. This gives the first thermal management loop 10 higher priority in terms of control accuracy, temperature stability, and safety redundancy, while the second thermal management loop 20 focuses on achieving continuous, low-energy heat dissipation operation over a wider temperature range.

[0036] Through this coordinated control method, the first thermal management loop 10 can prioritize meeting the battery cell's requirements for temperature accuracy and stability, while the second thermal management loop 20 can achieve continuous heat dissipation of the converter within a higher permissible temperature range. This avoids overcooling caused by a unified low-temperature control strategy without sacrificing battery safety and lifespan, thereby improving the overall energy efficiency of the system and reducing the ineffective operating time of the cooling system under different environmental conditions and load states.

[0037] The external ambient temperature can be monitored in real time by the ambient temperature sensor 3 or obtained through an external communication interface. The acquired external ambient temperature signal serves as an important environmental parameter for the control unit 4 to coordinate the thermal management mode, reflecting the climatic conditions in which the system is located, thereby providing an environmental basis for the selection of the operating mode and heat exchange strategy of the first thermal management loop 10 and the second thermal management loop 20.

[0038] In practical applications, in addition to the ambient temperature sensor 3, different sensors can be configured in the first thermal management loop 10 and the second thermal management loop 20. For example, a coolant flow sensor and a refrigeration system pressure sensor are added respectively to enable the control unit 4 to perform feedback control. Furthermore, an inlet water temperature sensor 6 and an outlet water temperature sensor 7 are added at the inlet and outlet of the first thermal management loop 10 and the second thermal management loop 20 respectively. By monitoring the inlet and outlet water temperature difference in the same loop and combining this with the real-time flow rate obtained from the flow sensor, the control unit 4 can perform more precise thermal management.

[0039] In practical applications, control unit 4 can also be deeply integrated with the energy management system of an energy storage power station. In this case, the target temperature of the battery cell and the target temperature of the converter not only serve as constraints for real-time control, but also as important reference parameters for energy scheduling and operation optimization.

[0040] The control strategy of control unit 4 is no longer limited to passive real-time response, but has predictive control capabilities. By combining future load forecasts issued by the energy management system, real-time electricity price signals from the power plant, and battery health status information, the system can achieve optimal life-cycle cost. For example, during off-peak hours, control unit 4 can pre-cool the battery using an active cooling device to cope with the high heat load during peak hours, thereby avoiding peak electricity prices; at the same time, the execution boundary of the pre-cooling strategy is still constrained by the battery's target temperature to prevent unnecessary excessive cooling.

[0041] In one embodiment, the first thermal management loop 10 includes a first temperature regulating device, which comprises a first active cooling device 101, a first cooler 102, and a heater 103. The first active cooling device 101 may sequentially include a compressor, a condenser, and an electronic expansion valve. It performs non-contact heat exchange with the cooling medium in the loop through a second heat exchange component 105 connected to the first thermal management loop 10, thereby promptly removing the heat generated during the charging and discharging of the battery cell and achieving active cooling regulation of the battery cell.

[0042] The first cooler 102 is disposed in the first thermal management circuit 10 and is used to passively dissipate heat from the cooling medium in the first thermal management circuit 10 by exchanging heat with the external environment when the first active cooling device 101 is turned off or not involved in operation, thereby achieving temperature regulation of the battery cell.

[0043] The heater 103 is disposed in the first thermal management circuit 10 and is used to heat the cooling medium in the circuit when the heat recovery through the first thermal management circuit 10 is insufficient to meet the heating requirements of the battery cell, so as to provide auxiliary heating capability to the battery cell and ensure that the battery cell is within a suitable operating temperature range.

[0044] The second thermal management loop 20 includes a second temperature regulation device, which comprises a second active cooling device 201 and a second cooler 202. The second active cooling device 201 may sequentially include a compressor, a condenser, and an electronic expansion valve. It performs non-contact heat exchange with the cooling medium in the loop through a third heat exchange component 204 connected to the second thermal management loop 20, thereby actively transferring the heat generated during converter operation and thus actively regulating the converter temperature.

[0045] The second cooler 202 is installed in the second thermal management circuit 20. When the second active cooling device 201 is turned off or not in operation, it passively dissipates heat from the cooling medium in the second thermal management circuit 20 by exchanging heat with the external environment, so as to meet the heat dissipation requirements of the converter without having to start the active cooling device.

[0046] In engineering implementation, the second heat exchange component 105 and the third heat exchange component 204 can adopt compact plate heat exchangers or microchannel heat exchangers to achieve efficient heat transfer between refrigerant and coolant, and can be flexibly arranged according to space and pressure requirements. The first cooler 102 and the second cooler 202 are air-liquid cooled radiators, which can adopt microchannel, finned tube or needle-fin structures, and can be integrated with variable air volume fans or evaporative cooling modules to enhance heat dissipation capacity in dry or high-temperature environments and reduce fan power consumption.

[0047] It should be noted that the target temperature of the inverter is approximately 45°C. Since the inverter continuously generates heat and tolerates high temperatures during operation, the second thermal management circuit 20 typically needs to continuously perform cooling to maintain the target temperature of its cooling medium around 45°C. The target temperature of the battery cell is approximately 18°C. It is extremely sensitive to temperature and, under most operating conditions, primarily relies on cooling, requiring heating only in specific environments such as low-temperature cold starts. Therefore, the first thermal management circuit 10 needs to flexibly switch between heating and cooling modes based on the real-time status of the battery to maintain the target temperature of its cooling medium around 18°C.

[0048] Based on typical global climate data, the period with temperatures between 5 and 35°C accounts for the largest proportion of the year, meaning that the probability of both circuits operating at high cooling loads simultaneously is low. Given the significant difference in target temperatures between the two circuits (approximately 27°C) and environmental adaptability requirements, physically isolated independent dual-system temperature control enables precise zoned management. This avoids energy efficiency losses caused by prolonged low-frequency operation of a single large-scale refrigeration system under low load, improving overall energy efficiency and reliability throughout the year.

[0049] In practical applications, such as Figure 1 As shown, a controlled heat exchange fan is also configured for the first and second temperature regulating devices. This fan performs multi-dimensional auxiliary heat dissipation functions in the system. On the one hand, during the operation of the active cooling device, the fan provides the necessary heat exchange airflow to the condenser; on the other hand, the fan provides additional natural heat dissipation power to the loop medium by driving ambient air to flow through the heat exchange core of the cooler.

[0050] Based on this, the first active cooling device 101 and the second active cooling device 201 are two physically isolated cooling devices, whose operating parameters and start-stop strategies are independently controlled by the control unit 4, and cooperate with the temperature regulation devices of their respective thermal management circuits to achieve temperature control of the battery cells and the inverter.

[0051] In one embodiment, the first thermal management loop 10 further includes a second flow path switching element 104 for establishing or disconnecting a second non-contact heat exchange path between the cooling medium of the first thermal management loop 10 and the cooling medium of the first active cooling device 101.

[0052] When the second non-contact heat exchange path is established, the cooling medium flows from the battery cell outlet through the second flow path switching element 104 and through the second heat exchange component 105 to exchange heat with the cooling medium of the first active cooling device 101, and then returns to the battery cell circuit to achieve forced cooling.

[0053] The second thermal management loop 20 also includes a third flow path switching element 203, used to establish or disconnect a third non-contact heat exchange path between the cooling medium of the second thermal management loop 20 and the cooling medium of the second active refrigeration device 201. When the third non-contact heat exchange path is established, the cooling medium flows from the inverter outlet through the third heat exchange component 204 to exchange heat with the cooling medium of the second active refrigeration device 201, and then returns to the inverter inlet to achieve forced cooling.

[0054] In engineering implementation, the second flow path switching element 104 and the third flow path switching element 203 can be a three-way valve, a proportional regulating valve, or a combination of a two-way valve and a three-way valve to achieve controllable adjustment of the cooling medium flow rate and improve the accuracy of heat control. Figure 2 For example,Figure 2 Both the second flow path switching element 104 and the third flow path switching element 203 are electrically operated three-way valves, including ends A, B, and C. End A of the second flow path switching element 104 and the third flow path switching element 203 is the inflow end (common end) of the cooling medium, while ends B and C are controlled selective outflow ends. Specifically, end B of the second flow path switching element 104 is connected to the first cooler 102, and end C is connected to the second heat exchange component 105; end B of the third flow path switching element 203 is connected to the second cooler 202, and end C is connected to the third heat exchange component 204. When the second flow path switching element 104 and the third flow path switching element 203 are set to AC-ON, a second non-contact heat exchange path and a third non-contact heat exchange path are established, respectively.

[0055] Through the coordinated control of the second flow path switching element 104 and the third flow path switching element 203, the first thermal management circuit 10 and the second thermal management circuit 20 can independently select passive heat dissipation or active cooling mode according to their respective real-time temperature control requirements, so that the active cooling device can work selectively as needed, and cooperate with the heat recovery between the circuits to avoid the compressor running at low frequency for a long time, thereby improving the energy efficiency and reliability throughout the year.

[0056] Based on the aforementioned dual-loop energy storage temperature control system, and considering the significant differences in the thermal load characteristics and temperature control requirements of the battery cells and converter under different external ambient temperatures and operating conditions, the control unit 4 performs pattern-based management of the operating status of the dual-loop energy storage temperature control system based on a comprehensive judgment of the ambient temperature, battery cell temperature status, and converter temperature status. Specifically, the control unit 4 can determine the current operating mode of the temperature control system according to the preset temperature range division and the target temperature relationship of each thermal management loop, and accordingly coordinate and control the first thermal management loop 10, the second thermal management loop 20, and the first flow path switching element 2, so that the system can complete temperature regulation in an appropriate manner under different environmental and load conditions. In different embodiments, the operating modes may include low-temperature heating mode, low-temperature air-liquid cooling mode, medium-low temperature cooling mode, high-temperature cooling mode, and fault switching mode, etc.

[0057] The following will combine specific operating modes and Figures 2-5 The control logic and working process of the dual-loop energy storage temperature control system under each mode are explained separately. Figures 2-5 In this system, all flow path switching components are electric three-way valves.

[0058] In one embodiment, when the ambient temperature is lower than a first preset value and the battery cell generates a heating request, a low-temperature heating mode is entered. The heating request may be triggered by the battery cell's own temperature falling below the target lower limit during a cold start or under low ambient temperature conditions, to avoid increased battery internal resistance, decreased usable capacity, or deterioration of charge / discharge performance at low temperatures. In this mode, the control unit 4 keeps the first active cooling device 101 and the second active cooling device 201 in a closed state, placing the system in a non-active cooling condition.

[0059] In non-active cooling mode, control unit 4 controls the second thermal management circuit 20 to enter air-liquid cooling operation, causing the cooling medium in the second thermal management circuit 20 to circulate under the drive of water pump 5 and exchange heat with the external environment through the second cooler 202. To enhance the heat exchange capacity of the cooler, control unit 4 simultaneously controls the fan to operate, causing airflow to pass through the surface of the second cooler 202, thereby removing the heat generated during the operation of the converter. A schematic diagram of the medium flow direction in the dual-loop energy storage temperature control system under low-temperature heating mode is shown below. Figure 2 As shown, in terms of specific structure, such as Figure 2 As shown, this can be achieved by setting the third flow path switching element 203 to AB pass.

[0060] Simultaneously, the control unit 4 controls the first flow path switching element 2 to establish a first non-contact heat exchange path, allowing the cooling medium in the second thermal management circuit 20, which still has a temperature rise after heat dissipation, to flow through the first heat exchange component 1 and transfer its heat to the cooling medium in the first thermal management circuit 10. Through this heat transfer method, the cooling medium in the first thermal management circuit 10 receives recovered heat from the second thermal management circuit 20 and further uses it to heat the battery cell, thereby achieving low-temperature heating of the battery cell without activating the active cooling device. In terms of specific structure, as shown... Figure 2 As shown, this can be achieved by setting the first flow path switching element 2 to BC pass.

[0061] To ensure that the cooling medium in the first thermal management circuit 10 primarily performs heat acquisition and transfer functions in the low-temperature heating mode without introducing unnecessary cooling effects, the flow path state of the second flow path switching element 104 can be adjusted so that the cooling medium in the first thermal management circuit 10 bypasses or does not flow through the first cooler 102. For example, as Figure 2 As shown, when the first active cooling device 101 remains off, the second flow path switching element 104 can be configured to AC-ON, allowing the cooling medium to flow into the first heat exchanger 1 through the second heat exchanger 105. Since the first active cooling device 101 is off, the cooling medium will not experience effective cooling when flowing through the second heat exchanger 105, ensuring that its temperature level matches the heating requirements of the battery cell.

[0062] In this mode, the waste heat generated on the converter side can be effectively utilized through the coordinated operation of fan-assisted heat dissipation and heat recovery between circuits, reducing the dependence on independent heating devices and improving the overall energy efficiency of the system under low-temperature conditions.

[0063] In one embodiment, in a low-temperature heating mode, the control unit 4 is configured to monitor the temperature rise status of the battery cell. The temperature rise status can be characterized by the rate of temperature increase of the battery cell over time. In practical applications, other temperature parameters, such as the real-time temperature of the battery cell, can also be used. When the monitored rate of temperature increase of the battery cell is lower than a set threshold, the control unit 4 determines that the heat recovered by the second thermal management loop 20 through the first heat exchange component 1 is insufficient to meet the heating requirements of the battery cell.

[0064] In this scenario, the control unit 4 activates the heater 103 located in the first thermal management circuit 10 to provide auxiliary heating to the cooling medium in the first thermal management circuit 10. This allows the cooling medium to transfer additional heat to the battery cell, thereby increasing the battery cell's heating rate and bringing it to the target temperature as quickly as possible. By prioritizing inter-circuit heat recovery as a heating method and introducing the heater 103 for compensation when necessary, the system can reduce the activation time and power output of the heater 103 while ensuring the battery's low-temperature performance, thus lowering the overall system energy consumption.

[0065] In one embodiment, when the ambient temperature is lower than a first preset value and the battery cell generates a cooling request, a low-temperature air-liquid cooling mode is entered. In this mode, the control unit 4 controls the first flow path switching element 2 to disconnect the first non-contact heat exchange path, preventing the cooling medium of the first thermal management flow path from entering the first heat exchange component 1. This structurally isolates the inter-loop heat exchange between the first thermal management loop 10 and the second thermal management loop 20, thereby ensuring that the two thermal management loops are independent of each other in terms of thermal performance. A schematic diagram of the medium flow direction of the dual-loop energy storage temperature control system in the low-temperature air-liquid cooling mode is shown below. Figure 3 As shown, in Figure 3 In this case, the first flow path switching element 2 can be switched to AB path.

[0066] In this operating state, the control unit 4 controls the shutdown of the first active cooling device 101 and the second active cooling device 201, preventing the system from entering the cooling operation mode. The first thermal management loop 10 and the second thermal management loop 20 respectively form a cooling medium circulation driven by their respective water pumps 5, and exchange heat with the external environment through the first cooler 102 and the second cooler 202 respectively. In terms of specific structural implementation, as follows... Figure 3 As shown, the cooling medium can be guided through the cooler by switching both the second flow path switching element 104 and the third flow path switching element 203 to AB flow.

[0067] In practical applications, in order to improve the heat dissipation capacity of the cooler, the control unit 4 controls the operation of the fan so that the airflow passes through the heat exchange surfaces of the first cooler 102 and the second cooler 202, thereby achieving coordinated air-liquid heat dissipation.

[0068] By using the above control method, under low temperature conditions, the favorable condition of low ambient temperature is fully utilized, so that both thermal management loops prioritize the use of non-active cooling heat dissipation methods to meet cooling requirements, avoiding the activation of active cooling devices, thereby reducing system energy consumption and improving operating efficiency under low temperature conditions.

[0069] In one embodiment, when the ambient temperature is between a first preset value and a second preset value and the battery cell generates a cooling request, a medium-low temperature cooling mode is entered. The control unit 4 controls the first flow path switching element 2 to disconnect the first non-contact heat exchange path, preventing heat transfer between the first thermal management circuit 10 and the second thermal management circuit 20 in this mode, thereby avoiding mutual interference with the cooling effect. A schematic diagram of the medium flow direction of the dual-loop energy storage temperature control system in the medium-low temperature cooling mode is shown below. Figure 4 As shown, in Figure 4 In this process, the above path control can be achieved by setting the first flow path switching element 2 to AB pass.

[0070] In this operating state, the control unit 4 activates the first active cooling device 101, causing the cooling medium in the first thermal management circuit 10 to flow through the second heat exchange component 105 under the drive of the water pump 5. This allows for non-contact heat exchange with the refrigerant in the first active cooling device 101, thereby achieving forced cooling of the cooling medium and meeting the cooling requirements of the battery cell under medium- and low-temperature environmental conditions. To achieve the above cooling path, as follows... Figure 4 As shown, a second non-contact heat exchange path can be established by setting the second flow path switching element 104 to AC, so that the second heat exchange component 105 is connected to the first thermal management circuit 10.

[0071] At the same time, the control unit 4 controls the shutdown of the second active cooling device 201, preventing the second thermal management circuit 20 from entering the cooling operation state, and instead allowing heat dissipation from the external environment through the second cooler 202. In terms of structural implementation, such as... Figure 4 As shown, by setting the third flow path switching element 203 to AB pass, the third non-contact heat exchange path can be cut off, so that the cooling medium bypasses the third heat exchange component 204 and completes heat dissipation through the second cooler 202.

[0072] During this process, the fan can continue to operate to enhance the heat dissipation effect of the second cooler 202 and to dissipate heat for the condenser of the first active cooling unit 101, thereby further ensuring the cooling effect.

[0073] Through the above control method, active cooling is activated only on the battery side under medium and low temperature environmental conditions, while air-liquid cooling is prioritized on the converter side. This achieves differentiated temperature control of the two thermal management loops under the same environmental conditions, avoids unnecessary simultaneous operation of cooling devices, and helps improve the overall energy efficiency and reliability of the system.

[0074] In one embodiment, when the ambient temperature is higher than or equal to a second preset value and the battery cell generates a cooling request, the system enters a high-temperature cooling mode. In this mode, the control unit 4 controls the first flow path switching element 2 to disconnect the first non-contact heat exchange path, preventing mutual interference with the cooling effect due to heat transfer between loops in a high-temperature environment. A schematic diagram of the medium flow direction in the high-temperature cooling mode of the dual-loop energy storage temperature control system is shown below. Figure 5 As shown, in Figure 5 In this process, by setting the first flow path switching element 2 to AB-through, the cooling medium of the first thermal management circuit 10 cannot enter the first heat exchange component 1.

[0075] In this operating state, the control unit 4 controls the activation of the first active cooling device 101 and the second active cooling device 201, respectively. This causes the cooling media in the first thermal management circuit 10 and the second thermal management circuit 20 to flow through their respective heat exchange components under the drive of their respective water pumps 5, exchanging heat with the cooling media in a non-contact manner, thereby achieving forced cooling of the battery unit and the inverter. Figure 5 As shown, in the first thermal management circuit 10, the second flow path switching element 104 is set to AC on, connecting the second non-contact heat exchange path, allowing the cooling medium to enter the second heat exchange component 105 to exchange heat with the refrigerant. In the second thermal management circuit 20, the third flow path switching element 203 is set to AC on, connecting the third non-contact heat exchange path, allowing the cooling medium to enter the third heat exchange component 204 to exchange heat with the refrigerant.

[0076] In practical applications, the control unit 4 controls the fan to run continuously, providing heat dissipation airflow for the first active cooling device 101 and the second active cooling device 201, so as to enhance the heat dissipation capacity of the system under high ambient temperature conditions and ensure the stable operation of the cooling system.

[0077] Through the above control method, active cooling can be implemented on both the battery unit and the inverter simultaneously under high temperature conditions, ensuring that both are within their respective target temperatures and meeting the system's stable operation requirements under high load and high ambient temperature conditions.

[0078] In one embodiment, when either the first active cooling device 101 or the second active cooling device 201 fails, the system enters a fault switching mode. After detecting a fault in the active cooling device, the control unit 4 shuts down the temperature regulation device on the thermal management loop where the faulty active cooling device is located, so that the thermal management loop no longer independently executes the temperature regulation process based on its own temperature regulation device, thereby avoiding the impact of abnormal operation under fault conditions on the system's safety and stability.

[0079] Subsequently, the control unit 4 controls the first flow path switching element 2 to establish a first non-contact heat exchange path, enabling the first thermal management loop 10 and the second thermal management loop 20 to exchange heat non-contactly through corresponding heat exchange components, thereby constructing a heat transfer channel between the two thermal management loops. Through this non-contact heat exchange path, the thermal management loop that has not malfunctioned can transfer heat or cold to the malfunctioning thermal management loop while maintaining its normal temperature regulation function, thus achieving indirect temperature regulation of the malfunctioning loop.

[0080] In fault-switching mode, control unit 4, based on the current ambient temperature and the target temperatures corresponding to the battery cells and inverters, executes the control strategy for the thermal management loop containing the active cooling device that has not experienced a fault, according to the corresponding operating mode. The operating modes include any one of the following: low-temperature heating mode, low-temperature air-liquid cooling mode, medium-low temperature cooling mode, or high-temperature cooling mode. During this process, the faulty thermal management loop no longer independently performs active temperature regulation; instead, it receives thermal support through the first non-contact heat exchange path.

[0081] For example, in high-temperature cooling mode, when the first active cooling device 101 malfunctions, the temperature regulating device in the first thermal management circuit 10 stops operating, and its temperature regulating function is compensated by the second thermal management circuit 20 through the first non-contact heat exchange path. The second thermal management circuit 20 continues to operate in high-temperature cooling mode, and the second active cooling device 201, which has not malfunctioned, continues to cool the second thermal management circuit 20 and transfers cooling energy to the first thermal management circuit 10 through the first non-contact heat exchange path, thereby meeting the temperature control requirements of the battery cell without relying on the malfunctioning device.

[0082] Through the above control method, even if a single active cooling device fails, the system can still rely on the unfailed thermal management loop and non-contact heat exchange between the loops to achieve coordinated temperature regulation of the battery cells and the converter, effectively improving the operational reliability and stability of the dual-loop energy storage temperature control system under fault conditions.

[0083] It should be noted that the architecture of the dual-loop energy storage temperature control system has strong scalability and versatility. Although this embodiment focuses on battery cells and inverters as the objects of regulation, in practical applications, this architecture can also be applied to the temperature control of photovoltaic inverters, energy storage transformers, or other industrial-grade high-power electronic devices. Furthermore, the energy exchange network formed by the first heat exchange component 1 can be further expanded into a three-loop or multi-loop system. For example, by adding an independent heat dispatch node, this system can be coupled with external cooling towers, dry coolers, or internal heating systems of the energy storage power station. In winter, the system can preferentially connect to external natural cold sources to pre-cool the second heat management loop 20, and send the waste heat recovered by the first heat exchange component 1 for heating in the office area, thereby integrating this temperature control system into the integrated energy microgrid and achieving cross-device energy gradient utilization.

[0084] In one embodiment, such as Figure 6 The diagram illustrates a process flow chart for a dual-loop energy storage temperature control method, which may include the following steps: Step S101: Obtain the external ambient temperature.

[0085] The ambient temperature reflects the environmental conditions of the dual-loop energy storage system and serves as the basic input parameter for determining the operating mode of the subsequent thermal management loop. In practical applications, the ambient temperature can be collected in real time by an ambient temperature sensor 3 located outside the system, or obtained through an external communication interface.

[0086] Step S102: Based on the external ambient temperature and the target temperatures corresponding to the battery cells and the inverter, determine the operating modes of the first thermal management circuit 10 and the second thermal management circuit 20.

[0087] Since the target temperature of the battery cell is lower than the target temperature of the inverter, the first thermal management circuit 10 and the second thermal management circuit 20 can be configured to operate in the same or different modes under different ambient temperature conditions to meet differentiated temperature control requirements. Specifically, depending on the ambient temperature range, the operating mode of the thermal management circuit can be determined to be at least one of the following: low-temperature heating mode, low-temperature air-liquid cooling mode, medium-low temperature cooling mode, high-temperature cooling mode, and fault switching mode, thereby achieving differentiated temperature control management for different heat load units.

[0088] Step S103: Based on the operating modes of the first thermal management circuit and the second thermal management circuit, coordinate and control the working states of the first thermal management circuit and the second thermal management circuit to achieve temperature regulation of the battery cell and the inverter.

[0089] Based on the operating mode, the working status of the temperature regulation device in each thermal management loop and the establishment or disconnection status of the non-contact heat exchange path between the loops are coordinated and controlled. This ensures that the first thermal management loop 10 and the second thermal management loop 20 remain structurally independent while forming on-demand coupling or decoupling at the thermal level, thereby keeping the battery cell and the converter within their respective target temperatures.

[0090] For specific limitations on the dual-loop energy storage temperature control method, please refer to the limitations on the dual-loop energy storage temperature control system mentioned above, which will not be repeated here. Through the above method steps, the operation mode determination and inter-loop coordinated control of the dual-loop energy storage system based on ambient temperature are realized, supporting the overall technical solution of independent temperature control and coordinated heat management of the dual loops on the system side at the method level.

[0091] In the above embodiments, by setting a first heat exchange component 1 between the first thermal management loop 10 and the second thermal management loop 20 corresponding to the battery cell and the converter, respectively, and coordinating with the controllable switching of the first flow path switching element 2, the two thermal management loops can achieve on-demand coupling or decoupling at the thermal level while maintaining the independence of their structures and cooling media. This allows for flexible coordination of the temperature regulation strategies of the battery cell and the converter based on the external ambient temperature and the target temperature differences of different heat load units. Since the target temperature of the battery cell is lower than the target temperature of the converter, the control unit 4 can enable the two loops to operate independently around their respective suitable temperature ranges, avoiding overcooling or energy waste caused by a single thermal management system accommodating different heat loads.

[0092] Based on this, by prioritizing the use of coolers for air-liquid cooling and activating the corresponding active cooling devices only under necessary conditions, the operating time of high-power cooling devices can be significantly reduced, making the compressor's operating state more closely match the actual heat load requirements, thereby improving the system's overall energy efficiency performance within the typical ambient temperature range throughout the year. Simultaneously, with the help of the first heat exchange component 1 located between the two loops, heat recovery and redistribution between the loops can be achieved under low temperatures or specific operating conditions, using the heat that would otherwise be dissipated for temperature regulation in the other loop, reducing heating or cooling energy consumption.

[0093] Furthermore, the dual-loop independently configured thermal management architecture provides the system with higher operational redundancy. Even in the event of malfunction or failure of some temperature control components, inter-loop thermal coordination can still maintain critical components within their permissible operating temperature range, improving system reliability and continuous operation capability. In summary, this invention achieves precise temperature control of battery cells and converter zones while effectively reducing system energy consumption and enhancing the adaptability, energy efficiency, and engineering application value of the dual-loop energy storage temperature control system under different environmental conditions.

[0094] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0096] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A dual-loop energy storage temperature control system, characterized in that, include: The first thermal management circuit is used to regulate the temperature of the battery cells; The second thermal management loop is used for temperature regulation of the converter; The first heat exchange component, disposed between the first thermal management circuit and the second thermal management circuit, is used to realize non-contact heat exchange between the first thermal management circuit and the second thermal management circuit; The first flow path switching element is used to establish or disconnect the first non-contact heat exchange path between the first thermal management circuit and the second thermal management circuit through the first heat exchange component; The control unit is electrically connected to the first thermal management circuit, the second thermal management circuit, and the first flow path switching element, respectively, and is used to coordinate and control the operating status of the first thermal management circuit and the second thermal management circuit based on the external ambient temperature and the target temperatures of the battery cell and the converter. The target temperature of the battery cell is lower than the target temperature of the inverter.

2. The dual-loop energy storage temperature control system according to claim 1, characterized in that, The first thermal management loop includes a first temperature regulating device, which includes a first active cooling device, a first cooler, and a heater. The first active cooling device performs non-contact heat exchange with the cooling medium in the first thermal management loop through a second heat exchange component connected to the first thermal management loop. The first cooler is used to passively dissipate heat from the battery cell when the first active cooling device is turned off. The heater is used to provide auxiliary heating to the battery cell when the heat recovered by the first thermal management loop is insufficient. The second thermal management loop includes a second temperature regulating device, which includes a second active cooling device and a second cooler. The second active cooling device performs non-contact heat exchange with the cooling medium in the second thermal management loop through a third heat exchange component connected to the second thermal management loop. The second cooler is used to passively dissipate heat from the converter when the second active cooling device is turned off. The first active cooling device and the second active cooling device are two physically isolated cooling devices, and the operating parameters of the first active cooling device and the second active cooling device are independently controlled by the control unit.

3. The dual-loop energy storage temperature control system according to claim 2, characterized in that, The first thermal management loop further includes a second flow path switching element, which is used to establish or disconnect a second non-contact heat exchange path between the cooling medium of the first thermal management loop and the cooling medium of the first active cooling device. The second thermal management circuit also includes a third flow path switching element, which is used to establish or disconnect a third non-contact heat exchange path between the cooling medium of the second thermal management circuit and the cooling medium of the second active cooling device.

4. The dual-loop energy storage temperature control system according to claim 2, characterized in that, The control unit is configured to: When the ambient temperature is lower than the first preset value and the battery cell generates a heating request, the first active cooling device and the second active cooling device are turned off, and the second thermal management circuit dissipates heat through the second cooler. The first flow path switching element is controlled to establish the first non-contact heat exchange path, so that the heat recovered in the second thermal management circuit is transferred to the first thermal management circuit for heating the battery cell.

5. The dual-loop energy storage temperature control system according to claim 4, characterized in that, The control unit is also configured to: if the temperature rise rate of the battery cell is detected to be lower than a set threshold, activate the heater to provide auxiliary heating to the battery cell.

6. The dual-loop energy storage temperature control system according to claim 2, characterized in that, The control unit is configured to: When the ambient temperature is lower than the first preset value and the battery cell generates a cooling request, the first flow path switching element is controlled to disconnect the first non-contact heat exchange path, shut down the first active cooling device and the second active cooling device, and dissipate heat through the first cooler and the second cooler respectively.

7. The dual-loop energy storage temperature control system according to claim 2, characterized in that, The control unit is configured to: When the ambient temperature is higher than the first preset value and lower than the second preset value, and the battery cell generates a cooling request, the first flow path switching element is controlled to disconnect the first non-contact heat exchange path and the first active cooling device is activated, so that the first thermal management circuit can be cooled through non-contact heat exchange between the first active cooling devices. The second active cooling device is turned off, allowing the second thermal management circuit to dissipate heat through the second cooler.

8. The dual-loop energy storage temperature control system according to claim 2, characterized in that, The control unit is configured to: When the ambient temperature is higher than or equal to the second preset value and the battery cell generates a cooling request, the first flow path switching element is controlled to disconnect the first non-contact heat exchange path. The first active cooling device is activated, so that the first thermal management circuit can be cooled through non-contact heat exchange between the first active cooling devices. The second active cooling device is activated, enabling the second thermal management circuit to achieve cooling through non-contact heat exchange between the second active cooling devices.

9. The dual-loop energy storage temperature control system according to claim 2, characterized in that, The control unit is configured to: When the first active cooling device or the second active cooling device malfunctions, the temperature control device on the thermal management circuit where the malfunctioning active cooling device is located is shut down. The first flow path switching element is controlled to establish the first non-contact heat exchange path, and based on the ambient temperature and the target temperatures of the battery cell and the converter, the operating status of the thermal management loop where the active cooling device without faults is located is coordinated and controlled to maintain the battery cell and the converter at their respective target temperatures.

10. A dual-loop energy storage temperature control method, characterized in that, The method, applied to a dual-loop energy storage temperature control system according to any one of claims 1 to 9, comprises: Obtain the external ambient temperature; Based on the external ambient temperature and the target temperatures corresponding to the battery cell and the inverter, the operating modes of the first thermal management circuit and the second thermal management circuit are determined. Based on the operating modes of the first thermal management circuit and the second thermal management circuit, the working states of the first thermal management circuit and the second thermal management circuit are coordinated and controlled to achieve temperature regulation of the battery cell and the inverter. The target temperature of the battery cell is lower than the target temperature of the inverter.

Images