Energy storage device container and control method

Abstract

The application relates to the field of new energy power generation and energy storage technology, and discloses an energy storage equipment container and a control method, the container comprising an energy storage battery, an energy storage converter, a first cooling circuit, a second cooling circuit and a heat release circuit. The first cooling circuit is used for heat dissipation of the energy storage battery, the second cooling circuit is used for heat dissipation of the energy storage converter, and the heat release circuit realizes heat dissipation; the three circuits realize heat exchange through a first heat exchanger. According to the temperature of the energy storage converter and / or the ambient temperature, the control method controls the first cooling circuit and the second cooling circuit to run in modes. The application realizes organic integration of battery and energy storage converter heat management, effectively prevents equipment over-temperature through a hierarchical heat dissipation strategy, and improves system reliability and energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of new energy power generation and energy storage technology, specifically to energy storage equipment containers and control methods. Background Technology

[0002] With the rapid development of new energy power generation and energy storage technologies, energy storage systems are evolving towards higher energy density, integration, and modularity. Among these, the integrated design scheme that embeds the energy storage converter (PCS) inside the battery energy storage container has attracted attention due to its ability to reduce external connections and save space.

[0003] However, this integrated design also brings new thermal management challenges. The PCS generates a lot of heat during operation, and its body temperature can rise significantly.

[0004] Therefore, designing a thermal management system for PCS-embedded energy storage containers that can effectively manage the heat generated by the PCS and control the ambient temperature of its compartment has become an urgent technical problem to be solved. Summary of the Invention

[0005] This invention provides an energy storage device container and a control method to solve the above-mentioned problems.

[0006] In a first aspect, the present invention provides an energy storage equipment container, including an energy storage battery, an energy storage converter, and further including a first cooling circuit for dissipating heat from the energy storage battery, a second cooling circuit for dissipating heat from the energy storage converter, and a heat release circuit for dissipating heat outward; the first cooling circuit, the second cooling circuit, and the heat release circuit exchange heat through a first heat exchanger.

[0007] By setting up a first cooling circuit, a second cooling circuit, and a heat dissipation circuit, and exchanging heat through the same first heat exchanger, this invention can simultaneously provide heat dissipation support for both the energy storage battery and the energy storage converter. Compared with the existing technology where the battery and converter each use independent heat dissipation systems, this invention shares a first heat exchanger, significantly simplifying the system structure and reducing manufacturing costs and space occupation. Simultaneously, the centralized heat exchange through the first heat exchanger allows most of the heat generated by the energy storage converter to be directly discharged outside the container via the heat dissipation circuit. This effectively avoids the adverse effects of the energy storage converter's heat generation on the operating temperature of the energy storage battery, solves the problem of overheating and system shutdown caused by the built-in PCS in the prior art, and improves the thermal safety and operational reliability of the energy storage equipment container.

[0008] In one optional embodiment, the first cooling circuit includes a first water pump, a first cooling device for absorbing heat from the energy storage battery, a first expansion tank, and a first heat exchanger connected by a pipeline. The first heat exchanger is used to exchange heat absorbed by the first cooling device.

[0009] In one optional embodiment, the first cooling circuit further includes a three-way valve disposed between the first water pump and the first cooling device, the three-way valve being used to connect the second cooling circuit.

[0010] In one optional embodiment, the second cooling circuit includes a second water pump, a second expansion tank, a second cooling device for absorbing heat from the energy storage converter, and a first heat exchanger connected by a pipeline. The first heat exchanger is used to exchange heat with the heat absorbed by the second cooling device.

[0011] In one optional embodiment, the second cooling circuit is connected to the first cooling circuit via a connecting pipe, and the connecting pipe is provided with a first control valve, which is used to control the on / off state of the second cooling circuit.

[0012] In one alternative embodiment, the heat release circuit includes a liquid-cooled unit consisting of a compressor, a condenser, and a throttling valve, and the first heat exchanger, wherein the liquid-cooled unit is used to release the heat absorbed by the first heat exchanger to the outside.

[0013] In one alternative embodiment, the energy storage equipment container further includes two independent compartments, with the energy storage battery and the energy storage converter located in the two independent compartments respectively.

[0014] By placing the energy storage battery and the energy storage converter in two separate compartments, the heat generated by the energy storage converter during operation can be effectively reduced to spread to the area where the energy storage battery is located, thereby reducing the impact of the energy storage converter's heat generation on the operating temperature of the energy storage battery.

[0015] In one alternative implementation, the energy storage container further includes a second heat exchanger that is on / off connected to the first cooling circuit.

[0016] By setting up a second heat exchanger that can be switched on and off with the first cooling circuit, the low-temperature cooling medium in the first cooling circuit can be used to absorb heat from the ambient air as needed, thereby regulating the air temperature inside the energy storage equipment container.

[0017] Secondly, the present invention also provides a control method for the energy storage equipment container, the control method comprising controlling the energy storage container to switch between at least two different heat dissipation modes based on the temperature of the energy storage converter and / or the ambient temperature of the energy storage converter compartment.

[0018] In one optional implementation, the heat dissipation mode includes: First mode: Start the heat dissipation circuit and the first cooling circuit, and start part of the dry cooler and cooling fan in the second cooling circuit; Second mode: Start the heat dissipation circuit and the first cooling circuit, and start all the dry coolers and cooling fans in the second cooling circuit; Third mode: Activate all dry coolers and cooling fans in the second cooling circuit, and control the connection between the first cooling circuit and the second cooling circuit; The step of controlling the energy storage container to switch between at least two different heat dissipation modes based on the temperature of the energy storage converter and / or the ambient temperature of the energy storage converter compartment includes: When the temperature of the energy storage converter is below a first threshold, the first mode is operated. When the temperature of the energy storage converter is higher than the first threshold but lower than the second threshold, the second mode is operated. When the temperature of the energy storage converter is higher than the second threshold, the third mode is activated. The second threshold is higher than the first threshold.

[0019] In one optional embodiment, the energy storage container includes a second heat exchanger, which is connectable to and disconnectable from the first cooling circuit. The heat dissipation mode further includes a fourth mode. Opening the second control valve between the second heat exchanger and the first cooling circuit, and starting the second heat exchanger, the step of controlling the energy storage container to switch between at least two different heat dissipation modes based on the temperature of the energy storage converter and / or the ambient temperature of the energy storage converter compartment, further includes: When the ambient temperature of the energy storage converter is higher than the third threshold, the third mode and the fourth mode are operated simultaneously; the third threshold is higher than the second threshold. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a container in an energy storage device container according to an embodiment of the present invention; Figure 2This is a basic working principle diagram of a container in an energy storage equipment container according to an embodiment of the present invention; Figure 3 This is a diagram of the energy storage and heat dissipation system in the first and second modes of the control method according to an embodiment of the present invention; Figure 4 This is a diagram of the energy storage and heat dissipation system in the third mode of the control method according to an embodiment of the present invention; Figure 5 This is a diagram of the energy storage and heat dissipation system in the fourth mode of the control method in this embodiment of the invention.

[0022] Explanation of reference numerals in the attached figures: 1. Container; 2. Isolation layer; 3. Energy storage battery; 4. Energy storage converter; 5. Liquid cooling unit; 6. Second heat exchanger; 7. First cooling circuit; 8. Second cooling circuit; 9. Heat release circuit. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] With the rapid development of new energy power generation and energy storage technologies, energy storage systems are evolving towards higher energy density, integration, and modularity. Among these, the integrated design scheme that embeds the energy storage converter (PCS) inside the battery energy storage container has attracted attention due to its ability to reduce external connections and save space.

[0025] However, this integrated design also brings new thermal management challenges. The PCS generates a significant amount of heat during operation, and its internal temperature can rise considerably. When the PCS is housed within a sealed or semi-sealed container, the continuous heat dissipation causes the ambient temperature of the compartment to accumulate and rise. This localized temperature rise presents two problems: first, the high temperature environment may affect the reliable operation of the PCS's internal electronic components, posing a risk of derating due to overheating or even triggering a protective shutdown; second, although the battery compartment and the PCS compartment can be physically separated by partitions, the sustained high temperature in adjacent compartments can still exacerbate the heat dissipation pressure on the entire container system through heat conduction and radiation, placing higher demands on the temperature control system to maintain the batteries within their optimal temperature range.

[0026] Existing thermal management solutions for energy storage containers mostly focus on cooling the battery pack itself, such as using independent battery liquid cooling cycles or in-cabin air circulation. For PCS (Power Packaging System) equipment, the common practice is to use external air cooling or independent liquid cooling modules. However, within the integrated compartment built into the PCS, the above solutions have limitations: simply increasing the capacity of the PCS's own heat sink does not solve the problem of ambient temperature buildup caused by heat being dissipated into the sealed compartment; and providing powerful ventilation and cooling for the entire container compartment is energy-intensive and not precise enough.

[0027] Therefore, designing a thermal management system for PCS-embedded energy storage containers that can effectively manage the heat generated by the PCS and control the ambient temperature of its compartment has become an urgent technical problem to be solved.

[0028] The following is combined with Figures 1 to 5 The following describes embodiments of the present invention.

[0029] According to an embodiment of the present invention, in one aspect, an energy storage device container is provided, see [link to relevant documentation]. Figure 1 Container 1 includes energy storage battery 3 and energy storage converter 4. Please refer to [link / reference]. Figure 2 The container 1 also includes a first cooling circuit 7, a second cooling circuit 8, and a heat dissipation circuit 9: the first cooling circuit 7 is used to dissipate heat for the energy storage battery 3; the second cooling circuit 8 is used to dissipate heat for the energy storage converter 4; the first cooling circuit 7, the second cooling circuit 8, and the heat dissipation circuit 9 exchange heat through a first heat exchanger.

[0030] By setting up a first cooling circuit, a second cooling circuit, and a heat dissipation circuit, and exchanging heat through the same first heat exchanger, this invention can simultaneously provide heat dissipation support for both the energy storage battery and the energy storage converter. Compared with the existing technology where the battery and converter each use independent heat dissipation systems, this invention shares a first heat exchanger, significantly simplifying the system structure and reducing manufacturing costs and space occupation. Simultaneously, the centralized heat exchange through the first heat exchanger allows most of the heat generated by the energy storage converter to be directly discharged outside the container via the heat dissipation circuit. This effectively avoids the adverse effects of the energy storage converter's heat generation on the operating temperature of the energy storage battery, solves the problem of overheating and system shutdown caused by the built-in PCS in the prior art, and improves the thermal safety and operational reliability of the energy storage equipment container.

[0031] In one embodiment, the heat release circuit 9 includes a liquid cooler unit 5, which is connected to a first heat exchanger to form the heat release circuit 9.

[0032] In this heat release circuit 9, the compressor inlet and the throttle valve outlet are connected to the first heat exchanger through pipelines, the throttle valve inlet is connected to the condenser through pipelines, and the condenser inlet is connected to the compressor outlet through pipelines, thus forming a complete refrigerant circulation circuit.

[0033] This application does not limit the heat dissipation circuit 9 to using only liquid cooling units for heat dissipation. The heat dissipation circuit 9 can also use other liquid cooling methods, or other suitable heat dissipation methods such as air cooling or two-phase cooling. The heat dissipation circuit 9 can be used to absorb heat from the first cooling circuit 7 or the second cooling circuit 8 through the first heat exchanger, and then dissipate the heat inside the energy storage container to the outside.

[0034] Specifically, to facilitate understanding of the working principle of the technical solution of this application, a specific embodiment of heat dissipation circuit using liquid cooling will be described below. An isolation layer 2 is provided inside the container 1, which divides the interior of the container 1 into a battery compartment and a PCS compartment. The energy storage battery 3 is located in the battery compartment, and the energy storage converter 4 is located in the PCS compartment, thereby achieving thermal isolation between the energy storage battery 3 and the energy storage converter 4, reducing the impact of heat generated by the energy storage converter 4 on the energy storage battery 3.

[0035] The first cooling circuit 7 is used to dissipate heat from the energy storage battery 3. A cooling medium circulates in the circuit, flowing through the cooling device of the energy storage battery 3 to absorb the heat generated by the battery. The second cooling circuit 8 is used to dissipate heat from the energy storage converter 4. This circuit is independent of the first cooling circuit 7, and a cooling medium circulates in it, flowing through the energy storage converter 4 to absorb the heat generated during converter operation. The heat dissipation circuit 9 dissipates heat through the liquid cooling unit 5.

[0036] The first cooling circuit 7, the second cooling circuit 8, and the heat dissipation circuit 9 are all connected to the first heat exchanger, through which they exchange heat. Specifically, the medium in the first cooling circuit 7 absorbs heat from the cooling device of the energy storage battery 3 and then flows into the first heat exchanger; the medium in the second cooling circuit 8 absorbs heat from the cooling device of the energy storage converter 4 and also flows into the first heat exchanger; simultaneously, the low-temperature medium in the heat dissipation circuit 9 also flows through the first heat exchanger. Inside the first heat exchanger, the media in the three circuits exchange heat. The heat from the first cooling circuit 7 and the second cooling circuit 8 is transferred to the heat dissipation circuit 9, and then the liquid cooling unit 5 discharges the heat to the outside of the container 1. Through this shared heat exchanger structure, the heat dissipation capacity of the liquid cooling unit 5 is used to simultaneously cool the energy storage battery 3 and the energy storage converter 4, improving heat dissipation efficiency and simplifying the system structure.

[0037] In this embodiment, the energy storage container is equipped with a first cooling loop 7 and a second cooling loop 8, which circulate independently, to achieve efficient thermal management. The first cooling loop 7 contains a cooling medium that flows through the first cooling device of the energy storage battery 3 to absorb the heat generated by the battery's operation. The second cooling loop 8 contains a cooling medium that flows through the second cooling device of the energy storage converter 4 to absorb the heat generated by the converter's operation. Both the first cooling loop 7 and the second cooling loop 8 are connected to the same first heat exchanger. A heat release loop 9 is also connected to this first heat exchanger and releases heat to the external environment through a liquid cooling unit 5. During operation, the heat-absorbing media in the two cooling loops flow into the first heat exchanger, where they exchange heat with the low-temperature media in the heat release loop 9. The heat is then uniformly transferred to the heat release loop 9 and discharged outside the container by the liquid cooling unit 5.

[0038] Through the shared heat exchanger structure described above, this embodiment utilizes the same liquid cooling unit 5 to simultaneously meet the heat dissipation requirements of the battery and converter, significantly reducing the number of heat exchangers and piping components, simplifying the system structure, and lowering manufacturing costs and space occupation. At the same time, the design of independent compartments and independent cooling circuits effectively avoids the adverse effects of PCS heat generation on the battery's operating environment temperature, solves the problem of system derating or shutdown due to overheating inside the compartment, and improves the thermal safety and operational reliability of the energy storage container.

[0039] In one embodiment, see Figure 3 The first cooling circuit 7 includes a first water pump connected by a pipeline, a first cooling device for absorbing heat from the energy storage battery 3, a first expansion tank, and a first heat exchanger. The first heat exchanger is used to realize heat exchange between the first cooling circuit 7, the second cooling circuit 8, and the heat release circuit 9.

[0040] The first cooling circuit 7 is a closed-loop circulation circuit for heat dissipation of the energy storage battery. In this circuit, the outlet of the first water pump is connected to the cooling inlet of the energy storage battery cooling device through a pipeline, the cooling outlet of the energy storage battery cooling device is connected to the inlet of the first expansion tank through a pipeline, the outlet of the first expansion tank is connected to the first heat exchanger through a pipeline, and the outlet of the first heat exchanger is connected back to the inlet of the first water pump through a pipeline, thus forming a complete circulation circuit.

[0041] The first water pump provides the circulation power for the cooling medium (e.g., water or an aqueous solution of ethylene glycol) in the circuit. The heat generated by the energy storage battery during operation is transferred to the cooling medium flowing through its internal cooling channels or the external battery compartment's cold plates. The cooled medium, having absorbed heat, then enters the first heat exchanger, where it exchanges heat with other circuits, transferring the heat away. The first expansion tank is connected to the circuit to accommodate the volume expansion and contraction of the coolant due to temperature changes, maintaining stable internal pressure and serving as a water replenishment and venting device.

[0042] In the first cooling circuit 7, please refer to Figure 2 and Figure 3 A PTC heater is connected in series on the pipeline between the first water pump and the first cooling device. This PTC heater is controlled by the system controller. During system startup or when the ambient temperature is low, it provides auxiliary heating to the circulating coolant, enabling the energy storage battery 3 to quickly reach its suitable operating temperature range, ensuring the battery's performance and safety at low temperatures. In a specific embodiment, the first cooling device is a battery cooling plate. This application is not limited to specific structures related to battery cooling; in addition to the battery cooling plate of this embodiment, other cooling devices for energy storage batteries can also be used.

[0043] In one embodiment, the first cooling circuit 7 further includes a three-way valve disposed between the first water pump and the first cooling device, the three-way valve being used to connect the second cooling circuit 8. One port of the three-way valve is connected to the main pipeline of the first cooling circuit 7, another port is connected to the second cooling circuit 8, and the third port is used to ensure the continuity of the circulation of the first cooling circuit 7 itself.

[0044] In one embodiment, the second cooling circuit 8 includes a second water pump, a second expansion tank, a cooling device for the energy storage converter 4, and a first heat exchanger connected by pipelines. The first heat exchanger is used to realize heat exchange between the first cooling circuit 7, the second cooling circuit 8, and the heat release circuit 9. In this embodiment, the cooling device for the energy storage converter 4 can be a PCS coolant system.

[0045] The second cooling circuit 8 is a closed-loop circulation circuit for heat dissipation of the energy storage converter 4. In this circuit, the inlet of the second water pump is connected to the first heat exchanger through a pipeline, the outlet of the second water pump is connected to the inlet of the second expansion tank through a pipeline, the outlet of the second expansion tank is connected to the cooling inlet of the energy storage converter cooling device through a pipeline, and the cooling outlet of the energy storage converter cooling device is connected to the first heat exchanger through a pipeline, thus forming a complete circulation circuit.

[0046] The second water pump provides circulation power for the cooling medium (e.g., water or an aqueous ethylene glycol solution) in the second cooling circuit 8. The energy storage converter 4 generates heat during operation, which is transferred to the cooling medium flowing through its internal cooling channels. The cooled medium, having absorbed heat, leaves the energy storage converter 4 and enters the first heat exchanger, where it exchanges heat with the first cooling circuit 7 and the heat release circuit 9, transferring the heat away. A second expansion tank is connected to the circuit to balance the volume fluctuations of the coolant within the circuit caused by temperature changes, maintaining stable pressure.

[0047] In one embodiment, the second cooling circuit 8 is connected to the first cooling circuit 7 via a connecting pipe, and a first control valve is provided on the connecting pipe to control the on / off state of the second cooling circuit 8.

[0048] The first control valve can be a solenoid valve, used to control the opening or closing of the connecting pipe. When the first control valve is closed, the first cooling circuit 7 and the second cooling circuit 8 operate independently, each cycling without interference. When the first control valve is open, the first cooling circuit 7 and the second cooling circuit 8 are connected to each other through the connecting pipe, allowing the cooling media in the two circuits to flow and mix. This allows the relatively cooler battery-side coolant to flow into or mix with the PCS-side coolant, thereby directly and quickly reducing the temperature of the coolant flowing to the PCS and providing additional heat dissipation capacity.

[0049] In one embodiment, the energy storage equipment container also includes two independent compartments, with the energy storage battery 3 and the energy storage converter 4 located in the two independent compartments respectively.

[0050] By placing the energy storage battery 3 and the energy storage converter 4 in two separate compartments, the heat generated by the energy storage converter 4 during operation can be effectively reduced to diffuse to the area where the energy storage battery 3 is located, thereby reducing the impact of the heat generated by the energy storage converter 4 on the operating temperature of the energy storage battery 3.

[0051] In one embodiment, the energy storage equipment container also includes a second heat exchanger 6, which is switched on and off with the first cooling circuit 7.

[0052] Specifically, the second heat exchanger 6 is an air-water heat exchanger, which is a device that uses air and water (or coolant) to exchange heat. The second heat exchanger 6 has a water passage inside, which has an inlet and an outlet. The inlet and outlet are respectively connected to the first cooling circuit 7 through pipes, thereby forming a water passage that can be connected to the first cooling circuit 7.

[0053] A second control valve (e.g., a solenoid valve) is installed between the water circuit and the first cooling circuit 7, allowing the water circuit to selectively connect or disconnect from the first cooling circuit 7. When the second control valve is open, the cooling medium in the first cooling circuit 7 can flow into the water circuit of the second heat exchanger 6, pass through the interior of the second heat exchanger 6, and then return to the first cooling circuit 7. At this time, the second heat exchanger 6 can use the cooling medium flowing through its water circuit to exchange heat with the surrounding air. When the second control valve is closed, the water circuit of the second heat exchanger 6 is disconnected from the first cooling circuit 7, the cooling medium no longer flows into the second heat exchanger 6, and the second heat exchanger 6 stops working.

[0054] By setting up a second heat exchanger 6 with a water channel that can be switched on and off with the first cooling circuit 7, the low-temperature cooling medium in the first cooling circuit 7 can be used to absorb heat from the ambient air as needed, thereby regulating the air temperature inside the energy storage equipment container.

[0055] Of course, the second heat exchanger 6 can also adopt other heat exchange structure forms.

[0056] According to an embodiment of the present invention, in another aspect, a temperature control method for an energy storage container is also provided, the temperature control method comprising: Based on the temperature of the energy storage converter 4 and / or the ambient temperature of the energy storage converter compartment, the energy storage container is controlled to switch between at least two different heat dissipation modes.

[0057] Specifically, the heat dissipation modes include: First Mode: Please refer to Figure 3 The system activates the heat dissipation circuit 9 and the first cooling circuit 7 of the liquid-cooled unit 5, and also starts some of the dry coolers and cooling fans in the second cooling circuit 8. Specifically, the temperature of the energy storage converter 4 is monitored in real time. When the temperature of the energy storage converter 4 is lower than a first threshold, the control system executes the first mode. In this mode, the heat dissipation circuit 9 and the first cooling circuit 7 of the liquid-cooled unit 5 are activated, allowing the cooling medium in the first cooling circuit 7 to exchange heat with the heat dissipation circuit 9 at the first heat exchanger, thereby dissipating heat for the energy storage battery 3. Simultaneously, some of the dry coolers and corresponding cooling fans in the second cooling circuit 8 are activated (e.g., only the first dry cooler and the first cooling fan are turned on), utilizing air cooling to dissipate heat from the energy storage converter 4. This mode is suitable for low-power operation of the energy storage converter 4.

[0058] Second mode: Please refer to Figure 3 The system activates the heat dissipation circuit 9 and the first cooling circuit 7 of the liquid-cooled unit 5, and starts all the dry coolers and cooling fans in the second cooling circuit 8. Specifically, when the temperature of the energy storage converter 4 rises above a first threshold but below a second threshold, the control system enters a second mode. In this mode, while continuing to operate the heat dissipation circuit 9 and the first cooling circuit 7, all the dry coolers and corresponding cooling fans in the second cooling circuit 8 are activated. Compared to the first mode, the second mode enhances the air cooling capacity of the second cooling circuit 8 for the energy storage converter 4 by activating all the dry coolers, thus meeting the heat dissipation requirements under medium power conditions.

[0059] Third Mode: Please see Figure 4 The system starts the heat release circuit 9 and the first cooling circuit 7 of the liquid-cooled unit 5, and starts all the dry coolers and cooling fans in the second cooling circuit 8. The first control valve is also opened to connect the first cooling circuit 7 and the second cooling circuit 8. Specifically, when the temperature of the energy storage converter 4 is higher than the second threshold, the control system enters a third mode. In this mode, the second threshold is higher than the first threshold. In this mode, the first control valve is opened, connecting the first cooling circuit 7 and the second cooling circuit 8 through a connecting pipe. After connection, the cooler cooling medium in the first cooling circuit 7 enters the second cooling circuit 8 and mixes with the medium in the second cooling circuit 8, thereby reducing the overall water temperature of the second cooling circuit 8 and improving the cooling effect on the energy storage converter 4.

[0060] In short, when the temperature of the energy storage converter is below a first threshold, the first mode is activated; When the temperature of the energy storage converter is higher than the first threshold but lower than the second threshold, the second mode is activated. When the temperature of the energy storage converter exceeds the second threshold, the third mode is activated. Through the above-mentioned hierarchical control strategy, different heat dissipation methods are activated step by step according to the power, temperature and ambient temperature of the energy storage converter 4, realizing multi-level thermal management from conventional heat dissipation to enhanced heat dissipation, then to loop coupling heat dissipation and ambient heat dissipation, which saves energy and ensures the safe operation of the system.

[0061] In one embodiment, the energy storage container includes a second heat exchanger 6, and the heat dissipation mode also includes a fourth mode: see [link to relevant documentation]. Figure 5 The second control valve between the second heat exchanger 6 and the first cooling circuit 7 is opened, and the second heat exchanger 6 is started, wherein the third threshold is higher than the second threshold. Specifically, when the ambient temperature of the energy storage converter is higher than the third threshold, the third mode and the fourth mode are operated simultaneously.

[0062] When the control method determines that the start-up conditions for the fourth mode are met (i.e., the temperature of the energy storage converter is higher than the fourth threshold), the control system issues a command to open the second control valve. After the second control valve opens, the low-temperature cooling medium in the first cooling circuit 7 is allowed to flow into the water path of the second heat exchanger 6, pass through the heat exchange core inside the second heat exchanger 6, and then return to the first cooling circuit 7. At the same time, the control system starts the fan of the second heat exchanger 6. The fan drives the hot air in the energy storage converter compartment to flow over the surface of the heat exchange core of the second heat exchanger 6. Because a low-temperature cooling medium flows through the core, the hot air exchanges heat with the core, and the air temperature decreases, thereby achieving the effect of reducing the ambient temperature inside the energy storage converter compartment.

[0063] By opening the second control valve and starting the fan, the second heat exchanger 6 is put into operation, using the cooling capacity of the first cooling circuit 7 to cool the air inside the cabin, effectively preventing the cabin environment temperature from becoming too high.

[0064] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A container for energy storage equipment, characterized in that, Includes energy storage battery (3) and energy storage converter (4); A first cooling circuit (7) for cooling the energy storage battery (3); The second cooling circuit (8) is used to cool the energy storage converter (4); Heat dissipation circuit (9) is used to dissipate heat outwards. The first cooling circuit (7), the second cooling circuit (8) and the heat dissipation circuit (9) share a first heat exchanger.

2. The energy storage equipment container according to claim 1, characterized in that, The first cooling circuit (7) includes a first water pump connected by a pipeline, a first cooling device for absorbing heat from the energy storage battery (3), a first expansion tank, and a first heat exchanger, wherein the first heat exchanger is used to exchange heat absorbed by the first cooling device.

3. The energy storage equipment container according to claim 2, characterized in that, The first cooling circuit (7) also includes a three-way valve located between the first water pump and the first cooling device, the three-way valve being used to connect the second cooling circuit (8).

4. The energy storage equipment container according to claim 1, characterized in that, The second cooling circuit (8) includes a second water pump, a second expansion tank, a second cooling device for absorbing heat from the energy storage converter (4) and a first heat exchanger connected by a pipeline. The first heat exchanger is used to exchange heat with the heat absorbed by the second cooling device.

5. The energy storage equipment container according to claim 4, characterized in that, The second cooling circuit (8) is connected to the first cooling circuit (7) through a connecting pipe. A first control valve is provided on the connecting pipe, which is used to control the on / off state of the second cooling circuit (8).

6. The energy storage equipment container according to claim 1, characterized in that, The heat release circuit (9) includes a liquid cooling unit consisting of a compressor, a condenser and a throttle valve and the first heat exchanger. The liquid cooling unit is used to release the heat absorbed by the first heat exchanger to the outside.

7. The energy storage equipment container according to any one of claims 1-6, characterized in that, The energy storage equipment container also includes two independent compartments, with the energy storage battery (3) and the energy storage converter (4) located in the two independent compartments respectively.

8. The energy storage equipment container according to claim 7, characterized in that, The energy storage equipment container also includes a second heat exchanger (6), which is connected to the first cooling circuit (7) in a switchable manner.

9. A temperature control method for an energy storage equipment container according to any one of claims 1-7, characterized in that, The temperature control method includes: Based on the temperature of the energy storage converter and / or the ambient temperature of the energy storage converter compartment, the energy storage equipment container is controlled to switch between at least two different heat dissipation modes.

10. The temperature control method according to claim 9, characterized in that, The heat dissipation modes include: First mode: Start the heat dissipation circuit and the first cooling circuit, and start part of the dry cooler and cooling fan in the second cooling circuit; Second mode: Start the heat dissipation circuit and the first cooling circuit, and start all the dry coolers and cooling fans in the second cooling circuit; Third mode: Start the heat dissipation circuit and the first cooling circuit, start all the dry coolers and cooling fans in the second cooling circuit, and control the first cooling circuit to be connected to the second cooling circuit; The step of controlling the energy storage container to switch between at least two different heat dissipation modes based on the temperature of the energy storage converter and / or the ambient temperature of the energy storage converter compartment includes: When the temperature of the energy storage converter is below a first threshold, the first mode is operated. When the temperature of the energy storage converter is higher than the first threshold but lower than the second threshold, the second mode is operated. When the temperature of the energy storage converter is higher than the second threshold, the third mode is activated. The second threshold is higher than the first threshold.

11. The temperature control method according to claim 10, characterized in that, The energy storage container includes a second heat exchanger, which is connectable to and disconnectable from the first cooling circuit. The heat dissipation mode also includes a fourth mode. Open the second control valve between the second heat exchanger and the first cooling circuit, and start the second heat exchanger. The method of controlling the energy storage container to switch between at least two different heat dissipation modes based on the temperature of the energy storage converter and / or the ambient temperature of the energy storage converter compartment further includes: When the ambient temperature of the energy storage converter is higher than the third threshold, the third mode and the fourth mode are operated simultaneously. The third threshold is higher than the second threshold.

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