A heat recycling system for energy storage battery cabinets

Abstract

The present application relates to the technical field of electrochemical energy storage, and discloses a heat recycling system for an energy storage battery cabinet, which comprises a circulating pipeline for cooling liquid flow, a liquid cooling unit for heat dissipation or supply of the battery cells in a plurality of battery packs, and a phase change heat storage device, wherein the liquid cooling unit can independently dissipate or supply heat to the battery cells in the plurality of battery packs through the circulating pipeline, the phase change heat storage device can independently dissipate heat from the battery cells in the plurality of battery packs through the circulating pipeline and simultaneously absorb and store the heat generated by the battery cells in the plurality of battery packs, or supply heat to the battery cells in the plurality of battery packs, and the phase change heat storage device and the liquid cooling unit can cooperate to dissipate heat from the battery cells in the plurality of battery packs through the circulating pipeline, absorb and store the heat generated by the battery cells in the plurality of battery packs, or supply heat to the battery cells in the plurality of battery packs. The present application ensures effective heat dissipation or supply of the battery cells during operation, improves the service life of the battery cells, and reduces the noise generated by the liquid cooling unit during operation under the condition of normal heat dissipation of the battery cells.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrochemical energy storage, in particular to a heat recycling system of an energy storage battery cabinet. BACKGROUND

[0002] The energy storage battery cabinet is used for storing and releasing electric energy when needed. When the energy storage battery cabinet is charging and discharging, a large amount of heat is generated in the electric cells in the multiple battery packs in the energy storage battery cabinet. In order to cool the electric cells, heat needs to be supplied to the electric cells when the ambient temperature is low.

[0003] Currently, a liquid cooling unit is commonly used to cool or heat the electric cells. When the liquid cooling unit fails and stops, it cannot effectively cool or heat the electric cells in the energy storage battery cabinet, which affects the performance of the electric cells and shortens the service life of the electric cells. In order to ensure that the electric cells are always within the working temperature threshold, when the temperature of the electric cells is higher than the working temperature threshold, the electric cells need to be cooled quickly, that is, the heat exchange efficiency between the refrigerant flowing through the heat exchanger in the liquid cooling unit and the cooling liquid flowing through the cold plate in the battery pack needs to be improved, that is, the heat dissipation efficiency of the refrigerant flowing through the condenser in the liquid cooling unit needs to be improved. The fan in the condenser runs at high speed to improve the heat dissipation efficiency of the refrigerant, but this has the problem of high fan noise. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a heat recycling system of an energy storage battery cabinet, which provides multiple ways to cool or heat the electric cells, ensures that the electric cells are always effectively cooled or heated during operation, improves the service life of the electric cells, and reduces the noise generated by the liquid cooling unit during operation under the condition of normal cooling of the electric cells.

[0005] The technical scheme adopted by the present application is as follows: a heat recycling system of an energy storage battery cabinet, comprising a circulating pipeline for cooling liquid flow, a liquid cooling unit for cooling or heating the electric cells in the multiple battery packs, the liquid cooling unit can independently cool or heat the electric cells in the multiple battery packs through the circulating pipeline, further comprising a phase change heat storage device, the phase change heat storage device can independently cool the electric cells in the multiple battery packs through the circulating pipeline and simultaneously absorb and store the heat generated by the electric cells in the multiple battery packs, or heat the electric cells in the multiple battery packs, the phase change heat storage device and the liquid cooling unit can cooperate to cool the electric cells in the multiple battery packs through the circulating pipeline and absorb and store the heat generated by the electric cells in the multiple battery packs, or heat the electric cells in the multiple battery packs.

[0006] Explanation: The phase change heat storage device can heat the electric cells, provided that the phase change heat storage device has completed heat storage before heating the electric cells.

[0007] Compared with the prior art, the present application has the following advantages:

[0008] When the ambient temperature is not high, the liquid cooling unit or phase change heat storage device can be started to dissipate heat from the battery cell. Compared with the conventional method of only using the liquid cooling unit for heat dissipation, this adds another way to dissipate heat from the battery cell. Even when the liquid cooling unit or phase change heat storage device is off, it can still ensure effective heat dissipation from the battery cell, thereby improving the battery cell's lifespan. The phase change heat storage device can also absorb and store the heat generated by the battery cell while dissipating heat from it, and use it to heat the battery cell later. This makes full use of the heat generated by the battery cell and minimizes energy waste. Moreover, the noise generated by using the phase change heat storage device is less than that generated by the operation of the liquid cooling unit, which is more environmentally friendly.

[0009] When the ambient temperature is high, the liquid chiller and phase change heat storage device can be started simultaneously to dissipate heat from the battery cells. The phase change heat storage device absorbs part of the temperature of the coolant in the circulation pipeline, while the liquid chiller cools the coolant. Since the phase change heat storage device has already absorbed part of the heat from the coolant, the liquid chiller does not need to keep the fan in the condenser at a high speed to improve the heat exchange efficiency. It only needs to run at a low speed, which can reduce the energy consumption of the liquid chiller and reduce the noise generated by the liquid chiller.

[0010] When the ambient temperature is low, heating the battery cells can be achieved by simply starting the liquid cooling unit or the phase change heat storage device. Compared to the conventional method of only using the liquid cooling unit for heating, this method adds another way to heat the battery cells. Even when the liquid cooling unit or the phase change heat storage device is off, it can still ensure effective heating of the battery cells, making full use of the heat generated by the battery cells and minimizing energy waste. Since the heat generated by the battery cells is used to heat them, while the liquid cooling unit consumes electricity when heating the battery cells, using the phase change heat storage device to heat the battery cells can also save electricity.

[0011] When the ambient temperature is particularly low, the liquid cooling unit heats the battery cells. Because the ambient temperature is low, the liquid cooling unit controls the boiling point by controlling the pressure of the refrigerant to obtain heat from the low temperature environment. The lower the ambient temperature, the more difficult it is for the liquid cooling unit to obtain heat, which leads to a decrease in the heating efficiency of the liquid cooling unit. At the same time, starting the liquid cooling unit and the phase change heat storage device can effectively heat the coolant, thereby effectively heating the battery cells and improving the service life of the battery cells.

[0012] The phase change thermal storage device and the liquid cooling unit work together to dissipate heat from the battery cells and simultaneously absorb and store the heat generated by the battery cells, or provide heat to the battery cells. This flexible combination can reduce the use of the liquid cooling unit and save electricity. The heat generated by the battery cells in the energy storage battery cabinet during each charging or discharging can be absorbed by the phase change thermal storage device to store the heat required by the energy storage battery cabinet for the rest of the day and dissipate heat from the battery cells.

[0013] As a preferred embodiment of the present invention, it further includes a control module for controlling the opening and closing of the phase change heat storage device and the liquid cooling unit, as well as a first detection module for detecting the temperature of the cells in the battery pack and a second detection module for detecting the temperature of the coolant between the first liquid outlet main pipe and the phase change heat storage device. The first detection module and the second detection module are used to transmit the detected temperature information to the control module.

[0014] When the control module receives temperature information from the first detection module that is higher than the preset first temperature threshold, the control module controls the liquid cooling unit to start, and the liquid cooling unit dissipates heat from the cells in multiple battery packs through the circulation pipeline.

[0015] When the control module receives temperature information from the second detection module that is higher than the preset second temperature threshold, the control module controls the liquid cooling unit to shut down and the phase change heat storage device to start. The phase change heat storage device dissipates heat for the cells in multiple battery packs through the circulation pipeline, and at the same time absorbs and stores the heat generated by the cells in multiple battery packs.

[0016] When the control module receives temperature information from the first detection module that is lower than the preset first temperature threshold, the control module controls the phase change heat storage device to start, and the phase change heat storage device supplies heat to multiple battery cells through the circulation pipeline.

[0017] In this scheme, the first temperature threshold is the normal operating temperature of the battery cell. When the first detection module detects that the battery cell temperature is higher than the normal operating temperature, the liquid cooling unit is started to dissipate heat from the battery cell. After a period of time, when the temperature of the coolant flowing out from the liquid cooling plate at the bottom of the battery cell reaches the phase change temperature of the phase change material, the second temperature threshold refers to the phase change temperature of the phase change material in the phase change heat storage device. At this time, the liquid cooling unit is shut down and the phase change heat storage device is started to absorb and store the heat generated by the battery cell, while continuing to dissipate heat from the coolant, which is to say, to dissipate heat from the battery cell. When the battery cell temperature is lower than the normal operating temperature, the phase change heat storage device heats the battery cell by storing the heat, making full use of the heat generated by the battery cell and saving energy consumption of the liquid cooling unit.

[0018] In a preferred embodiment of the present invention, a third detection module is further included for detecting the temperature of the coolant between the phase change heat storage device and the liquid cooling unit. The third detection module is used to transmit the detected temperature information to the control module.

[0019] When the phase change heat storage device is activated to absorb and store the heat generated by multiple battery cells, the control module receives temperature information from the third detection module that is higher than the preset third temperature threshold. The control module then controls the liquid cooling unit to start. The phase change heat storage device and the liquid cooling unit work together to dissipate heat from the battery cells in the multiple battery packs through the circulation pipeline, while simultaneously absorbing and storing the heat generated by the multiple battery cells in the battery packs.

[0020] In this scheme, the third temperature threshold refers to the normal temperature of the coolant used to dissipate heat from the battery cell. When the phase change heat storage device absorbs and stores the heat generated by the battery cell, that is, when it absorbs and stores the heat of the coolant passing through the liquid cooling plate below the battery cell, the phase change material in the phase change heat storage device tends to be saturated. The coolant is cooled after passing through the phase change heat storage device. When the temperature of the coolant does not meet the requirements for cooling the battery cell, the liquid cooling unit is started to cool the coolant again.

[0021] In a preferred embodiment of the present invention, a thermistor for heating the coolant is also included, the third detection module is used to detect the coolant temperature between the phase change heat storage device and the thermistor, and the control module is used to control the thermistor to be energized or de-energized.

[0022] When the phase change thermal storage device is activated to heat multiple battery cells, the control module receives temperature information from the third detection module that is lower than the preset fourth temperature threshold. The control module then controls the thermistor to be energized. The phase change thermal storage device and the thermistor work together to heat the battery cells in multiple battery packs through the circulation pipeline.

[0023] In this scheme, the fourth temperature threshold refers to the normal temperature of the coolant used to heat the battery cell. When the phase change heat storage device is used to heat the coolant, most of the heat stored in the phase change material in the phase change heat storage device is consumed. After the coolant passes through the phase change heat storage device, it is heated. However, if the temperature of the coolant does not meet the requirements for heating the battery cell, the control module controls the thermistor to connect to the power supply. The thermistor heats the coolant again, so that the temperature of the coolant meets the requirements for heating the battery cell.

[0024] In a preferred embodiment of the present invention, the control module is also used to control the power outage or start-up of the energy storage battery cabinet, and further includes a fourth detection module for detecting the temperature of the coolant on the first liquid inlet main pipe, the fourth detection module being used to transmit the detected temperature information to the control module;

[0025] When the control module receives temperature information from the fourth detection module that is outside the third and fourth temperature thresholds, the control module controls the energy storage battery cabinet to cut off power.

[0026] In this scheme, when the temperature information detected by the fourth detection module is outside the third and fourth temperature thresholds, that is, when the temperature of the coolant on the first inlet manifold is always outside the normal temperature value, that is, when the temperature of the coolant flowing through the liquid cooler unit is always outside the normal temperature value, it indicates that the liquid cooler unit has malfunctioned, and the entire energy storage battery cabinet is powered off for maintenance.

[0027] In a preferred embodiment of the present invention, the system further includes multiple battery packs. The circulation pipeline is provided with a first inlet main pipeline for supplying coolant to the multiple battery packs in the energy storage battery cabinet, a first outlet main pipeline for the coolant flowing out of the multiple battery packs in the energy storage battery cabinet, a first branch pipeline connected in parallel with the phase change heat storage device, and a second branch pipeline connected in parallel with the liquid cooling unit. The system also includes a first valve for controlling the flow of coolant through the phase change heat storage device, a second valve located on the first branch pipeline, a third valve located on the second branch pipeline, and a fifth valve for controlling the flow of coolant through the liquid cooling unit.

[0028] Each of the battery packs is connected to the first liquid inlet main pipe and the first liquid outlet main pipe respectively. One end of the first branch pipe and the parallel line of the phase change heat storage device are connected to the first liquid outlet main pipe, and the other end is connected in parallel and then converges to connect to the first intermediate pipe. The other end of the second branch pipe and the parallel line of the liquid cooler unit are connected to the first liquid inlet main pipe, and the other end is connected in parallel and then converges to connect to the first intermediate pipe. A first water pump is provided on the first intermediate pipe.

[0029] In this scheme, multiple battery packs, a first liquid outlet main pipe, a first branch pipe, a liquid cooler unit, and a first liquid inlet main pipe are sequentially connected to form a loop for heat dissipation or heating of the battery cells. Multiple battery packs, a first liquid outlet main pipe, a phase change heat storage device, a second branch pipe, and a first liquid inlet main pipe are sequentially connected to form a loop for absorbing and storing heat from the battery cells and for heat dissipation or heating of the battery cells. Multiple battery packs, a first liquid outlet main pipe, a phase change heat storage device, a liquid cooler unit, and a first liquid inlet main pipe are sequentially connected to form a loop for heat dissipation or heating of the battery cells.

[0030] In a preferred embodiment of the present invention, a thermistor is also included in parallel with the liquid cooling unit. The thermistor is connected in parallel with the liquid cooling unit and the second branch pipe. A fourth valve for controlling the flow of coolant through the thermistor is also provided on the circulation pipeline. One end of the parallel line of the thermistor, the liquid cooling unit and the second branch pipe is connected to the first intermediate pipeline, and the other end is connected in parallel and then converges to the first liquid inlet main pipeline.

[0031] In this scheme, multiple battery packs, the first liquid outlet main pipe, the phase change heat storage device, the thermistor, and the first liquid inlet main pipe are connected in sequence to form a loop for heating the battery cells.

[0032] In a preferred embodiment of the present invention, a fifth detection module for detecting ambient temperature is also included. The fifth detection module is used to transmit the detected temperature information to the control module. The liquid cooling unit includes a condenser, and the condenser includes a fan for heat dissipation. The control module is also used to control the fan speed setting.

[0033] When the liquid cooling unit is started to dissipate heat from the cells in multiple battery packs, the control module receives temperature information from the fifth detection module that is higher than the set fifth temperature threshold. The control module then controls the phase change heat storage device to start and controls the fan in the condenser to maintain a low speed. The phase change heat storage device and the liquid cooling unit dissipate heat from the cells in multiple battery packs through circulation pipelines.

[0034] In this solution, the fifth temperature threshold refers to temperatures higher than the ambient temperature. Conventionally, the fan in the condenser of the liquid chiller needs to maintain a high speed to improve the heat dissipation efficiency of the refrigerant, thereby increasing the heat exchange efficiency between the refrigerant and the coolant. This can easily lead to higher noise levels in the liquid chiller. In this solution, when the ambient temperature is high, both the liquid chiller and the phase change heat storage device are started simultaneously. The phase change heat storage device absorbs and stores part of the heat from the coolant, and the liquid chiller only needs to absorb the remaining heat from the coolant. This reduces the requirement for the heat exchange efficiency between the refrigerant and the coolant in the liquid chiller, allowing the fan in the condenser to maintain a low speed, reducing the energy consumption of the liquid chiller and lowering the noise generated by it.

[0035] In a preferred embodiment of the present invention, the invention further includes multiple battery packs, a first heat exchanger for dissipating heat or supplying heat to the refrigerant flowing through the condenser in the chiller unit, and the circulation pipeline is provided with a second main inlet pipe for providing coolant to the multiple battery packs in the energy storage battery cabinet, a second main outlet pipe for the coolant flowing out of the multiple battery packs in the energy storage battery cabinet, a second water pump located on the second main inlet pipe, a third branch pipe connected in parallel with the second water pump, and a sixth valve for controlling the flow of coolant through the first heat exchanger, a seventh valve for controlling the flow of coolant through the phase change heat storage device, an eighth valve for controlling the flow of coolant through the chiller unit, a ninth valve for controlling the flow of coolant through the second water pump, and a tenth valve for controlling the flow of coolant through the third branch pipe. The chiller unit, the first heat exchanger, and the phase change heat storage device are connected in parallel to each other.

[0036] The chiller unit, the first heat exchanger, and the phase change heat storage device are connected in parallel at one end to the second liquid outlet main pipe and at the other end to the second liquid inlet pipe. Both ends of the third branch pipe are connected to the second liquid inlet main pipe.

[0037] It also includes a sixth detection module for detecting ambient temperature, which transmits the detected temperature information to the control module. The liquid cooling unit includes a condenser, which includes a fan for heat dissipation. The control module is also used to control the fan speed setting.

[0038] When the liquid cooling unit is started to dissipate heat from the cells in multiple battery packs, the control module receives temperature information from the sixth detection module that is higher than the set sixth temperature threshold. The control module then controls the phase change heat storage device to start and controls the fan in the condenser to maintain a low speed. The first heat exchanger, the phase change heat storage device, and the chiller unit dissipate heat from the cells in multiple battery packs through the circulation pipeline.

[0039] In this scheme, the phase change heat storage device dissipates heat or heats the refrigerant flowing through the condenser of the chiller unit through the first heat exchanger. When dissipating heat for the refrigerant flowing through the condenser of the chiller unit, the phase change heat storage device shares part of the fan's work, reducing the heat dissipation of the fan and allowing the fan to not need to maintain a high speed, thereby reducing the noise generated by the fan, which in turn reduces the noise generated by the liquid cooling unit. Attached Figure Description

[0040] Figure 1 This is the control flowchart of the heat recovery and utilization system for the energy storage battery cabinet of the present invention;

[0041] Figure 2 This is a schematic diagram of the coolant flow path in Embodiment 1 of the heat recovery and utilization system for the energy storage battery cabinet of the present invention;

[0042] Figure 3 This is a schematic diagram of the coolant flow path in Embodiment 2 of the energy storage battery cabinet heat recovery and utilization system of the present invention. Detailed Implementation

[0043] Typical embodiments embodying the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0044] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] The reference numerals in the attached drawings include: 1. Liquid cooling unit; 2. Phase change heat storage device; 3. Thermistor; 4. First liquid inlet main pipe; 5. Battery pack; 6. First liquid outlet main pipe; 7. First branch pipe; 8. Second branch pipe; 9. First valve; 10. Second valve; 11. Third valve; 12. Fourth valve; 13. Fifth valve; 14. First water pump; 15. First heat exchanger; 16. Second water pump; 17. Third branch pipe; 18. Sixth valve; 19. Seventh valve; 20. Eighth valve; 21. Ninth valve; 22. Tenth valve.

[0046] Example 1

[0047] Energy storage battery cabinet heat recovery and utilization system, such as Figure 2As shown, the system includes a circulation pipeline for coolant flow, a phase change heat storage device 2 for absorbing and storing heat and providing heat, multiple battery packs 5, a thermistor 3 for heating the coolant, and a liquid cooling unit 1 for dissipating heat or providing heat to the cells within the multiple battery packs 5. The circulation pipeline is equipped with a first inlet main pipe 4 for supplying coolant to the multiple battery packs 5 in the energy storage battery cabinet, a first outlet main pipe 6 for receiving coolant flowing out of the multiple battery packs 5 in the energy storage battery cabinet, a first branch pipe 7 connected in parallel with the phase change heat storage device 2, and a second branch pipe 8 connected in parallel with both the thermistor 3 and the liquid cooling unit 1. It also includes a first valve 9 for controlling the flow of coolant through the phase change heat storage device 2, a second valve 10 located on the first branch pipe 7, a third valve 11 located on the second branch pipe 8, a fourth valve 12 for controlling the flow of coolant through the thermistor 3, and a fifth valve 13 for controlling the flow of coolant through the liquid cooling unit 1.

[0048] Multiple battery packs 5 are respectively connected to the first liquid inlet main pipe 4 and the first liquid outlet main pipe 6. The thermistor 3 and the liquid cooler 1 are connected in parallel. One end of the parallel line of the first branch pipe 7 and the phase change heat storage device 2 is connected to the first liquid outlet main pipe 6, and the other end is connected in parallel and then converges to connect to the first intermediate pipe. The other end of the parallel line of the second branch pipe 8, the thermistor 3 and the liquid cooler 1 is connected to the first liquid inlet main pipe 4, and the other end is connected in parallel and then converges to connect to the first intermediate pipe. The first intermediate pipe is equipped with a first water pump 14.

[0049] In this embodiment, multiple battery packs 5, a first liquid outlet main pipe 6, a second valve 10, a first branch pipe 7, a first water pump 14, a first intermediate pipe, a fifth valve 13, a liquid cooling unit 1, and a first liquid inlet main pipe 4 are connected in sequence to form a first circuit for heat dissipation or heat supply to the battery cells.

[0050] Multiple battery packs 5, a first liquid outlet main pipe 6, a first valve 9, a phase change heat storage device 2, a first water pump 14, a first intermediate pipe, a third valve 11, a second branch pipe 8, and a first liquid inlet main pipe 4 are connected in sequence to form a second circuit for absorbing and storing the heat generated by the battery cells and dissipating heat from multiple battery cells, or for heating the battery cells in multiple battery packs 5.

[0051] The third circuit, which is formed by connecting multiple battery packs 5, the first liquid outlet main pipe 6, the first valve 9, the phase change heat storage device 2, the first water pump 14, the first intermediate pipe, the fourth valve 12, the thermistor 3, and the first liquid inlet main pipe 4 in sequence, is used to heat the cells inside the multiple battery packs 5.

[0052] Multiple battery packs 5, first liquid outlet main pipe 6, first valve 9, phase change heat storage device 2, first water pump 14, fifth valve 13, liquid cooler unit 1, and first liquid inlet main pipe 4 are connected in sequence to form a fourth circuit for dissipating heat from the battery cells and absorbing and storing the heat generated by the battery cells.

[0053] In this embodiment, the liquid-cooled unit 1 includes a compressor, a condenser, an expansion valve, and a second heat exchanger. The condenser includes a fan for heat dissipation. The compressor, condenser, expansion valve, and second heat exchanger are connected in sequence to form a circuit for refrigerant circulation. The coolant flowing in the circulation pipeline, which dissipates heat or heats the battery cells through the liquid cooling plate, exchanges heat with the refrigerant through the second heat exchanger.

[0054] In this embodiment, a phase change material is provided in the phase change heat storage device 2. The phase change heat storage device 2 stores and releases heat through the phase change material. When the coolant passes through the phase change material through the pipe, the phase change material dissipates heat or provides heat to the coolant.

[0055] In this embodiment, current energy storage systems (such as energy storage battery cabinets and energy storage containers) typically perform two charging and two discharging cycles per day. The phase change thermal storage device in this embodiment absorbs and stores heat during each charging or discharging cycle of the energy storage system, which can meet the heat demand of the battery cells in the energy storage system for a whole day. This reduces the use of liquid cooling units, saves energy, and reduces noise. Furthermore, in this embodiment, the phase change thermal storage device is connected in series with the liquid cooling unit, meaning that the phase change thermal storage device is directly connected to the main pipeline for the flow of coolant, which can improve the heat exchange efficiency of the coolant. Moreover, the phase change thermal storage device itself generates little noise during operation, and the combined use of the phase change thermal storage device and the liquid cooling unit can reduce the overall noise generated.

[0056] like Figure 1 As shown, it also includes a control module for controlling the opening and closing of the phase change heat storage device 2, the opening and closing of the liquid cooling unit 1, controlling the power on or off of the thermistor 3, controlling the fan speed setting, and controlling the power off or start of the energy storage battery cabinet; a first detection module for detecting the temperature of the cells inside the battery pack 5; a second detection module for detecting the temperature of the coolant between the first liquid outlet main pipe 6 and the phase change heat storage device 2; a third detection module for detecting the temperature of the coolant on the first intermediate pipe; a fourth detection module for detecting the temperature of the coolant on the first liquid inlet main pipe 4; and a fifth detection module for detecting the ambient temperature.

[0057] The first, second, third, fourth, and fifth detection modules are used to transmit the detected temperature information to the control module.

[0058] In this embodiment, the third detection module is used to detect the coolant temperature between the phase change heat storage device 2 and the liquid cooling unit 1, and the coolant temperature between the phase change heat storage device 2 and the thermistor 3.

[0059] When the control module receives temperature information from the first detection module that is higher than the preset first temperature threshold, that is, when the cell temperature is higher than the normal operating temperature of the cell, the control module controls the liquid cooling unit 1 to start. The liquid cooling unit 1 dissipates heat from the cells in the multiple battery packs 5 through the first circuit.

[0060] When the liquid cooling unit 1 is started to dissipate heat from the cells in the multiple battery packs 5, the control module receives temperature information from the fifth detection module that is higher than the set fifth temperature threshold, that is, when the ambient temperature is higher than the normal ambient temperature. The control module controls the phase change heat storage device 2 to start and controls the fan in the condenser to keep at a low speed. The phase change heat storage device 2 and the liquid cooling unit 1 dissipate heat from the cells in the multiple battery packs 5 through the fourth circuit and absorb the heat generated by the stored cells.

[0061] When the control module receives temperature information from the second detection module that is higher than the preset second temperature threshold, that is, when the temperature of the coolant flowing out of the battery pack liquid cooling plate is higher than the phase change temperature of the phase change material in the phase change heat storage device 2, the control module controls the liquid cooling unit 1 to shut down and the phase change heat storage device 2 to start, that is, to switch from the first circuit to the second circuit. The phase change heat storage device 2 dissipates heat for the cells in the multiple battery packs 5 through the second circuit, and at the same time absorbs and stores the heat generated by the cells in the multiple battery packs 5.

[0062] When the phase change heat storage device 2 is activated to absorb and store the heat generated by multiple battery cells, the control module receives temperature information from the third detection module that is higher than the preset third temperature threshold. That is, at this time, the temperature of the coolant in the first intermediate pipeline is higher than the required coolant temperature for cooling the battery cells. The control module controls the liquid cooling unit 1 to start. The phase change heat storage device 2 and the liquid cooling unit 1 work together to dissipate heat from the battery cells in the multiple battery packs 5 through the fourth circuit, and at the same time absorb and store the heat generated by the multiple battery cells in the battery packs 5.

[0063] When the control module receives temperature information from the first detection module that is lower than the preset first temperature threshold, that is, when the cell temperature is lower than the normal operating temperature of the cell, the control module controls the phase change heat storage device 2 to start. The phase change heat storage device 2 supplies heat to multiple cells through the second circuit. In this embodiment, the phase change heat storage device 2 has completed heat storage before use.

[0064] When the phase change heat storage device 2 is activated to heat multiple battery cells, the control module receives temperature information from the third detection module that is lower than the preset fourth temperature threshold. That is, the temperature of the coolant in the first intermediate pipeline is lower than the required coolant temperature for heating the battery cells. The control module controls the thermistor 3 to connect to the power supply. The phase change heat storage device 2 and the thermistor 3 work together to heat the battery cells in multiple battery packs 5 through the third circuit.

[0065] When the control module receives temperature information from the fourth detection module that is outside the third and fourth temperature thresholds, the control module controls the energy storage battery cabinet to cut off power.

[0066] Example 2

[0067] like Figure 3 As shown, this embodiment is basically the same as embodiment 1, except that it also includes multiple battery packs 5, a first heat exchanger 15 for dissipating heat or supplying heat to the refrigerant flowing through the condenser in the chiller unit, a second main inlet pipe on the circulation pipeline for providing coolant to the multiple battery packs 5 in the energy storage battery cabinet, a second main outlet pipe for receiving coolant flowing out of the multiple battery packs 5 in the energy storage battery cabinet, a second water pump 16 located on the second main inlet pipe, a third branch pipe 17 connected in parallel with the second water pump 16, and a sixth valve 18 for controlling the flow of coolant through the first heat exchanger 15, a seventh valve 19 for controlling the flow of coolant through the phase change heat storage device 2, an eighth valve 20 for controlling the flow of coolant through the chiller unit, a ninth valve 21 for controlling the flow of coolant through the second water pump 16, and a tenth valve 22 for controlling the flow of coolant through the third branch pipe 17. The chiller unit, the first heat exchanger 15, and the phase change heat storage device 2 are connected in parallel to each other.

[0068] One end of the chiller unit, the first heat exchanger 15, and the phase change heat storage device 2 connected in parallel is connected to the second liquid outlet main pipe, and the other end is connected to the second liquid inlet pipe. Both ends of the third branch pipe 17 are connected to the second liquid inlet main pipe.

[0069] In this embodiment, a fifth circuit is formed by connecting multiple battery packs 5, the second liquid outlet main pipe, the liquid cooling unit 1, the third branch pipe 17, and the second liquid inlet main pipe to dissipate heat or provide heat to the battery cells.

[0070] The sixth loop, formed by connecting the liquid chiller 1, the first heat exchanger 15, and the phase change heat storage device 2, is used to dissipate heat or provide heat to the refrigerant. In this embodiment, the first heat exchanger 15 is connected to the condenser in the liquid chiller 1, that is, the pipe through the phase change heat storage device is close to the pipe through which the refrigerant flows in the condenser. The phase change heat storage device dissipates heat and absorbs and stores heat for the refrigerant in the liquid chiller 1, or provides heat.

[0071] The seventh circuit, which is used to heat the battery cells, is formed by connecting multiple battery packs 5, the second liquid outlet main pipe, the phase change heat storage device 2, the second water pump 16, and the second liquid inlet main pipe in sequence.

[0072] It also includes a sixth detection module for detecting ambient temperature. The sixth detection module is used to transmit the detected temperature information to the control module. The liquid cooling unit 1 includes a condenser, which includes a fan for heat dissipation. The control module is also used to control the fan speed setting.

[0073] When the liquid cooling unit 1 is started to dissipate heat from the cells in multiple battery packs 5, the control module receives temperature information from the sixth detection module that is higher than the set sixth temperature threshold, which means that the ambient temperature is higher than the normal ambient temperature. The control module controls the phase change heat storage device 2 to start and controls the fan in the condenser to keep at a low speed. The first heat exchanger 15, the phase change heat storage device 2, and the chiller unit dissipate heat from the cells in multiple battery packs 5 through the circulation pipeline.

[0074] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A heat recovery and utilization system for an energy storage battery cabinet, comprising a circulation pipeline for coolant flow and a liquid cooling unit for dissipating or heating the cells in multiple battery packs, wherein the liquid cooling unit can independently dissipate or heat the cells in multiple battery packs through the circulation pipeline, characterized in that: It also includes a phase change heat storage device, which can dissipate heat from the cells in multiple battery packs individually through a circulation pipeline, and simultaneously absorb and store the heat generated by the cells in multiple battery packs, or provide heat to the cells in multiple battery packs. The phase change heat storage device and the liquid cooling unit can work together to dissipate heat from the cells in multiple battery packs through a circulation pipeline, and absorb and store the heat generated by the cells in multiple battery packs, or provide heat to the cells in multiple battery packs. It also includes a control module for controlling the opening and closing of the phase change heat storage device, the opening and closing of the liquid cooling unit, and the fan speed setting; a first detection module for detecting the temperature of the cells in the battery pack; a second detection module for detecting the temperature of the coolant between the first liquid outlet main pipe and the phase change heat storage device; and a fifth detection module for detecting the ambient temperature. The first detection module, the second detection module, and the fifth detection module are used to transmit the detected temperature information to the control module. The liquid cooling unit includes a condenser, and the condenser includes a fan for heat dissipation; When the control module receives temperature information from the first detection module that is higher than the preset first temperature threshold, the control module controls the liquid cooling unit to start, and the liquid cooling unit dissipates heat from the cells in multiple battery packs through the circulation pipeline. When the control module receives temperature information from the second detection module that is higher than the preset second temperature threshold, the control module controls the liquid cooling unit to shut down and the phase change heat storage device to start. The phase change heat storage device dissipates heat for the cells in multiple battery packs through the circulation pipeline, and at the same time absorbs and stores the heat generated by the cells in multiple battery packs. When the control module receives temperature information from the first detection module that is lower than the preset first temperature threshold, the control module controls the phase change heat storage device to start, and the phase change heat storage device supplies heat to multiple battery cells through the circulation pipeline. When the liquid cooling unit is started to dissipate heat from the cells in multiple battery packs, the control module receives temperature information from the fifth detection module that is higher than the set fifth temperature threshold. The control module then controls the phase change heat storage device to start and controls the fan in the condenser to maintain a low speed. The phase change heat storage device and the liquid cooling unit dissipate heat from the cells in multiple battery packs through circulation pipelines.

2. The energy storage battery cabinet heat recovery and utilization system according to claim 1, characterized in that: It also includes a third detection module for detecting the temperature of the coolant between the phase change thermal storage device and the liquid cooling unit, the third detection module being used to transmit the detected temperature information to the control module; When the phase change heat storage device is activated to absorb and store the heat generated by multiple battery cells, the control module receives temperature information from the third detection module that is higher than the preset third temperature threshold. The control module then controls the liquid cooling unit to start. The phase change heat storage device and the liquid cooling unit work together to dissipate heat from the battery cells in the multiple battery packs through the circulation pipeline, while simultaneously absorbing and storing the heat generated by the multiple battery cells in the battery packs.

3. The energy storage battery cabinet heat recovery and utilization system according to claim 2, characterized in that: It also includes a thermistor for heating the coolant, the third detection module for detecting the coolant temperature between the phase change heat storage device and the thermistor, and the control module for controlling the thermistor to be energized or de-energized. When the phase change thermal storage device is activated to heat multiple battery cells, the control module receives temperature information from the third detection module that is lower than the preset fourth temperature threshold. The control module then controls the thermistor to be energized. The phase change thermal storage device and the thermistor work together to heat the battery cells in multiple battery packs through the circulation pipeline.

4. The energy storage battery cabinet heat recovery and utilization system according to claim 1, characterized in that: The control module is also used to control the power outage or start-up of the energy storage battery cabinet, and also includes a fourth detection module for detecting the temperature of the coolant on the first liquid inlet main pipe. The fourth detection module is used to transmit the detected temperature information to the control module. When the control module receives temperature information from the fourth detection module that is outside the third and fourth temperature thresholds, the control module controls the energy storage battery cabinet to cut off power.

5. The energy storage battery cabinet heat recovery and utilization system according to claim 1, characterized in that: It also includes multiple battery packs, and the circulation pipeline is provided with a first inlet main pipeline for supplying coolant to the multiple battery packs in the energy storage battery cabinet, a first outlet main pipeline for the coolant flowing out of the multiple battery packs in the energy storage battery cabinet, a first branch pipeline connected in parallel with the phase change heat storage device, and a second branch pipeline connected in parallel with the liquid cooler unit, as well as a first valve for controlling the flow of coolant through the phase change heat storage device, a second valve located on the first branch pipeline, a third valve located on the second branch pipeline, and a fifth valve for controlling the flow of coolant through the liquid cooler unit; Each of the battery packs is connected to the first liquid inlet main pipe and the first liquid outlet main pipe respectively. One end of the first branch pipe and the parallel line of the phase change heat storage device are connected to the first liquid outlet main pipe, and the other end is connected in parallel and then converges to connect to the first intermediate pipe. The other end of the second branch pipe and the parallel line of the liquid cooler unit are connected to the first liquid inlet main pipe, and the other end is connected in parallel and then converges to connect to the first intermediate pipe. A first water pump is provided on the first intermediate pipe.

6. The energy storage battery cabinet heat recovery and utilization system according to claim 5, characterized in that: It also includes a thermistor connected in parallel with the liquid cooling unit. The thermistor is connected in parallel with the liquid cooling unit and the second branch pipe. The circulation pipeline is also equipped with a fourth valve for controlling the flow of coolant through the thermistor. One end of the parallel line of the thermistor, the liquid cooling unit and the second branch pipe is connected to the first intermediate pipeline, and the other end is connected in parallel and then converges to the first liquid inlet main pipeline.

7. A heat recovery and utilization system for an energy storage battery cabinet, comprising a circulation pipeline for coolant flow and a liquid cooling unit for dissipating or heating the cells in multiple battery packs, wherein the liquid cooling unit can independently dissipate or heat the cells in multiple battery packs through the circulation pipeline, characterized in that: It also includes a phase change heat storage device, multiple battery packs, and a first heat exchanger for dissipating or heating the refrigerant flowing through the condenser in the chiller unit. The phase change heat storage device can dissipate heat for the cells in the multiple battery packs through a circulation pipeline, and simultaneously absorb and store the heat generated by the cells in the multiple battery packs, or provide heat for the cells in the multiple battery packs. The phase change heat storage device and the liquid chiller unit can cooperate to dissipate heat for the cells in the multiple battery packs through a circulation pipeline, and absorb and store the heat generated by the cells in the multiple battery packs, or provide heat for the cells in the multiple battery packs. The circulation pipeline is equipped with a second main inlet pipe for supplying coolant to multiple battery packs in the energy storage battery cabinet, a second main outlet pipe for the coolant flowing out of the multiple battery packs in the energy storage battery cabinet, a second water pump located on the second main inlet pipe, a third branch pipe connected in parallel with the second water pump, and a sixth valve for controlling the flow of coolant through the first heat exchanger, a seventh valve for controlling the flow of coolant through the phase change heat storage device, an eighth valve for controlling the flow of coolant through the chiller unit, a ninth valve for controlling the flow of coolant through the second water pump, and a tenth valve for controlling the flow of coolant through the third branch pipe. The chiller unit, the first heat exchanger, and the phase change heat storage device are connected in parallel to each other in pairs. The chiller unit, the first heat exchanger, and the phase change heat storage device are connected in parallel at one end to the second liquid outlet main pipe and at the other end to the second liquid inlet pipe. Both ends of the third branch pipe are connected to the second liquid inlet main pipe. It also includes a sixth detection module for detecting ambient temperature, which transmits the detected temperature information to the control module. The liquid cooling unit includes a condenser, which includes a fan for heat dissipation. The control module is also used to control the fan speed setting. The sixth loop, formed by connecting the liquid chiller, the first heat exchanger, and the phase change heat storage device, is used to dissipate heat or provide heat to the refrigerant. The first heat exchanger is connected to the condenser in the liquid chiller, and the phase change heat storage device dissipates heat or provides heat to the refrigerant flowing through the condenser in the chiller through the first heat exchanger. When the liquid cooling unit is started to dissipate heat from the cells in multiple battery packs, the control module receives temperature information from the sixth detection module that is higher than the set sixth temperature threshold. The control module then controls the phase change heat storage device to start and controls the fan in the condenser to maintain a low speed. The first heat exchanger, the phase change heat storage device, and the chiller unit dissipate heat from the cells in multiple battery packs through the circulation pipeline.

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