Heat recycling system of energy storage battery cabinet

Abstract

The invention relates to the technical field of electrochemical energy storage, and discloses an energy storage battery cabinet heat recycling system, which comprises a circulation pipeline for circulation of cooling liquid and a liquid cooling unit for heat dissipation or heat supply of battery cells in a plurality of battery packs, and the liquid cooling unit can independently dissipate heat or supply heat to the battery cells in the plurality of battery packs through the circulation pipeline. The system further comprises a phase change heat storage device, the phase change heat storage device can independently dissipate heat of the battery cells in the multiple battery packs through the circulation pipeline and absorb and store heat generated by the battery cells in the multiple battery packs at the same time or supply heat to the battery cells in the multiple battery packs, and the phase change heat storage device and the liquid cooling unit can cooperate to dissipate heat of the battery cells in the multiple battery packs through the circulation pipeline. And heat generated by the battery cells in the plurality of battery packs is absorbed and stored, or heat is supplied to the battery cells in the plurality of battery packs. According to the invention, effective heat dissipation or heat supply for the battery cell in the operation process is ensured all the time, the service life of the battery cell is prolonged, and noise generated during operation of the liquid cooling unit can be reduced under the condition of normal heat dissipation for the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical energy storage, and in particular to a heat recovery system for an energy storage battery cabinet. Background Art

[0002] The energy storage battery cabinet is used to store electrical energy and release it to supply power when needed. When the energy storage battery cabinet is charging and discharging, the battery cells in the multiple battery packs in the energy storage battery cabinet will generate a lot of heat. In order for the battery cells to work normally, the battery cells need to be cooled. When the ambient temperature is low, the temperature of the battery cells themselves drops. In order for the battery cells to work normally, the battery cells need to be heated.

[0003] At present, liquid cooling units are commonly used to dissipate heat or provide heat for battery cells. When the liquid cooling unit fails and stops, it cannot effectively dissipate heat or provide heat for the battery cells in the energy storage battery cabinet, which affects the performance of the battery cells themselves and shortens the service life of the battery cells. In order to ensure that the battery cells are always within the operating temperature threshold, when the battery cell temperature is higher than the operating temperature threshold, the battery cells need to be quickly cooled, that is, the heat exchange efficiency between the refrigerant flowing through the heat exchanger in the liquid cooling unit and the coolant 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, and the fan in the condenser runs at a high speed to improve the heat dissipation efficiency of the refrigerant, but this has the problem of high fan noise. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a heat recovery and utilization system for an energy storage battery cabinet, which provides a variety of ways to dissipate heat or supply heat to the battery cells, ensure that the battery cells are always effectively dissipated or heated during operation, increase the service life of the battery cells, and reduce the noise generated during the operation of the liquid cooling unit while dissipating heat for the battery cells normally.

[0005] The technical solution adopted by the present invention is as follows: a heat recovery and utilization system for an energy storage battery cabinet, comprising a circulation pipeline for the circulation of coolant, and a liquid cooling unit for dissipating heat or providing heat to multiple battery cells in a battery pack, wherein the liquid cooling unit can dissipate heat or provide heat to multiple battery cells in a battery pack through the circulation pipeline alone, and also comprises a phase change heat storage device, wherein the phase change heat storage device can dissipate heat to multiple battery cells in a battery pack through the circulation pipeline alone, and simultaneously absorb and store the heat generated by multiple battery cells in the battery pack, or provide heat to multiple battery cells in the battery pack, wherein the phase change heat storage device and the liquid cooling unit can cooperate to dissipate heat to multiple battery cells in a battery pack through the circulation pipeline, and absorb and store the heat generated by multiple battery cells in the battery pack, or provide heat to multiple battery cells in the battery pack.

[0006] Explanation: The phase change heat storage device can provide heat for the battery cell, provided that the phase change heat storage device has completed heat storage before providing heat for the battery cell.

[0007] Compared with the prior art, the present invention has the following beneficial effects: When the ambient temperature is not high, the liquid cooling unit or phase change heat storage device can be started to dissipate heat for the battery cells. Compared with the conventional method of only using the liquid cooling unit for heat dissipation, an additional method of heat dissipation for the battery cells is added. When the liquid cooling unit or the phase change heat storage device is in the shutdown state, it can also ensure that the battery cells are always effectively cooled, thereby increasing the service life of the battery cells. The phase change heat storage device can also absorb and store the heat generated by the battery cells while dissipating the heat for the battery cells, which is used for subsequent heating of the battery cells, making full use of the heat generated by the battery cells, and avoiding energy waste to the maximum extent. In addition, the noise generated by the phase change heat storage device is smaller than the noise generated by the liquid cooling unit when it is running, which is environmentally friendly. When the ambient temperature is high, the liquid cooling unit and the phase change heat storage device can be started at the same time 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, and the liquid cooling unit cools down the coolant. Since the phase change heat storage device has absorbed part of the heat of the coolant, the liquid cooling unit does not need to keep the fan in the condenser at a high speed to improve the heat exchange efficiency. It only needs a low speed, which can reduce the energy consumption of the liquid cooling unit and reduce the noise generated by the liquid cooling unit. When the ambient temperature is low, only the liquid cooling unit or the phase change heat storage device can be started to heat the battery cells. Compared with the conventional method of only using the liquid cooling unit for heating, an additional method of heating the battery cells is added. When the liquid cooling unit or the phase change heat storage device is in the shutdown state, it can also ensure effective heating for the battery cells, make full use of the heat generated by the battery cells, and avoid energy waste to the maximum extent. Since the heat generated by the battery cells themselves is used when heating the battery cells, and the liquid cooling unit consumes electricity when using the liquid cooling unit to heat the battery cells, using the phase change heat storage device to heat the battery cells can also save electricity; When the ambient temperature is particularly low, the battery cells are heated. When 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, resulting in a lower heating efficiency of the liquid cooling unit. Starting the liquid cooling unit and the phase change heat storage device at the same time can effectively heat the coolant, and then effectively heat the battery cells, thereby increasing the service life of the battery cells. The phase change heat storage device and the liquid cooling unit work together to dissipate heat for the battery cells, and at the same time absorb and store the heat generated by the battery cells, or provide heat for the battery cells. The flexible coordination method 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 each time it is charged or discharged can allow the phase change heat storage device to absorb the heat required for the subsequent day by the energy storage battery cabinet and dissipate heat for the battery cells.

[0008] As a preferred embodiment of the present invention, it also includes a control module for controlling the start and stop of the phase change heat storage device and the start and stop of the liquid cooling unit, as well as a first detection module for detecting the temperature of the battery cell in the battery pack, and a second detection module for detecting the temperature of the coolant between the first liquid outlet main pipeline and the phase change heat storage device, wherein the first detection module and the second detection module are used to transmit the detected temperature information to the control module; When the temperature information received by the control module from the first detection module is higher than a preset first temperature threshold, the control module controls the liquid cooling unit to start, and the liquid cooling unit dissipates heat for the battery cells in the multiple battery packs through a circulation pipeline; When the temperature information received by the control module from the second detection module is higher than a preset second temperature threshold, the control module controls the liquid cooling unit to be turned off and the phase change heat storage device to be started, and the phase change heat storage device dissipates heat for the battery cells in the multiple battery packs through the circulation pipeline, and absorbs and stores the heat generated by the battery cells in the multiple battery packs at the same time; When the control module receives temperature information from the first detection module that is lower than a preset first temperature threshold, the control module controls the phase change heat storage device to start, and the phase change heat storage device provides heat to multiple battery cells through a circulation pipeline.

[0009] In this solution, 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 of the battery cell, the liquid cooling unit is started to dissipate heat for the battery cell. After a period of time, when the temperature of the coolant flowing out of 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. 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 for the coolant, that is, to dissipate heat for the battery cell. When the battery cell temperature is lower than the normal operating temperature of the battery cell, the phase change heat storage device heats the battery cell through the stored heat, making full use of the heat generated by the battery cell and saving energy consumption of the liquid cooling unit.

[0010] As a preferred embodiment of the present invention, it also includes a third detection module for detecting the temperature of the coolant between the phase change heat storage device and the liquid cooling unit, and the third detection module is used to transmit the detected temperature information to the control module; When the phase change heat storage device is started to absorb the heat generated by multiple battery cells and store heat, the control module receives temperature information from the third detection module that is higher than the preset third temperature threshold, and the control module controls the liquid cooling unit to start. The phase change heat storage device and the liquid cooling unit cooperate to dissipate heat for the battery cells in the multiple battery packs through the circulation pipeline, and at the same time absorb the heat generated by the multiple battery cells in the battery pack and store heat.

[0011] In this scheme, the third temperature threshold refers to the normal temperature of the coolant for dissipating 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 under the battery cell, the phase change material in the phase change heat storage device tends to be saturated in heat absorption, and the coolant is cooled after passing through the phase change heat storage device. When the temperature of the coolant does not meet the requirement for cooling the battery cell, the liquid cooling unit is started to cool the coolant again.

[0012] As a preferred embodiment of the present invention, it also includes a thermistor for heating the coolant, 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 powered on or off; When the phase change heat storage device is started to provide heat for multiple battery cells, the control module receives temperature information from the third detection module that is lower than a preset fourth temperature threshold, and the control module controls the thermistor to be energized. The phase change heat storage device and the thermistor cooperate to provide heat for multiple battery cells in the battery pack through a circulation pipeline.

[0013] In this scheme, the fourth temperature threshold refers to the normal temperature of the coolant that provides heat to the battery cells. When the phase change heat storage device provides heat for the cooling heat, the phase change material in the phase change heat storage device consumes most of the heat stored. The coolant is heated after passing through the phase change heat storage device. However, when the temperature of the coolant does not meet the requirement for heating the battery cells, the control module controls the thermistor to be connected to the power supply, and the thermistor heats the coolant again so that the temperature of the coolant meets the requirement for heating the battery cells.

[0014] As a preferred embodiment of the present invention, the control module is also used to control the power off 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 pipeline, and 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 temperature threshold and the fourth temperature threshold, the control module controls the energy storage battery cabinet to cut off power.

[0015] In this solution, when the temperature information detected by the fourth detection module is outside the third temperature threshold and the fourth temperature threshold, that is, the temperature of the coolant on the first liquid inlet main pipe is always outside the normal temperature value, that is, the temperature of the coolant flowing through the liquid cooling unit is always outside the normal temperature value, it indicates that the liquid cooling unit has a fault and the entire energy storage battery cabinet is powered off for maintenance.

[0016] As a preferred embodiment of the present invention, it also includes multiple battery packs, and the circulation pipeline is provided with a first liquid inlet main pipeline for providing cooling liquid to the multiple battery packs in the energy storage battery cabinet, a first liquid outlet main pipeline for circulating the cooling liquid 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, and a first valve for controlling the coolant to flow 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 coolant to flow through the liquid cooling unit; The multiple battery packs are respectively connected to the first liquid inlet main pipeline and the first liquid outlet main pipeline. One end of the first branch pipeline and the phase change heat storage device parallel circuit is connected to the first liquid outlet main pipeline, and the other end is connected in parallel and converges to connect to the first intermediate pipeline. The other end of the second branch pipeline and the liquid cooling unit parallel circuit is connected to the first liquid inlet main pipeline, and the other end is connected in parallel and converges to connect to the first intermediate pipeline. A first water pump is provided on the first intermediate pipeline.

[0017] In the present scheme, multiple battery packs, a first liquid outlet main pipeline, a first branch pipeline, a liquid cooling unit, and a first liquid inlet main pipeline are connected in sequence to form a loop for dissipating heat or supplying heat to the battery cells. Multiple battery packs, a first liquid outlet main pipeline, a phase change heat storage device, a second branch pipeline, and a first liquid inlet main pipeline are connected in sequence to form a loop for absorbing and storing heat from the battery cells and dissipating heat or supplying heat to the battery cells. Multiple battery packs, a first liquid outlet main pipeline, a phase change heat storage device, a liquid cooling unit, and a first liquid inlet main pipeline are connected in sequence to form a loop for dissipating heat or supplying heat to the battery cells.

[0018] As a preferred embodiment of the present invention, 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, and the circulation pipeline is also provided with a fourth valve for controlling the coolant to flow 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 converged together to be connected to the first liquid inlet main pipeline.

[0019] In this solution, multiple battery packs, a first liquid outlet main pipeline, a phase change heat storage device, a thermistor, and a first liquid inlet main pipeline are connected in sequence to form a loop for supplying heat to the battery cells.

[0020] As a preferred embodiment of the present invention, it further includes a fifth detection module for detecting the ambient temperature, the fifth detection module is used to transmit the detected temperature information to the control module, the liquid cooling unit includes a condenser, the condenser includes a fan for heat dissipation, and the control module is also used to control the fan wind speed gear; When the liquid cooling unit is started to dissipate heat for the battery 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, and the control module controls the phase change heat storage device to start, and controls the fan in the condenser to maintain a low speed gear. The phase change heat storage device and the liquid cooling unit dissipate heat for the battery cells in multiple battery packs through a circulation pipeline.

[0021] In this scheme, the fifth temperature threshold refers to a temperature higher than the general ambient temperature. Conventionally, the fan in the condenser of the liquid cooling unit is required to maintain a high speed to improve the heat dissipation efficiency of the refrigerant, thereby improving the heat exchange efficiency between the refrigerant and the coolant, which may easily cause the liquid cooling unit to generate a large noise. In this scheme, when the ambient temperature is high, the liquid cooling unit and the phase change heat storage device are started at the same time. The phase change heat storage device absorbs and stores part of the heat of the coolant, and the liquid cooling unit only needs to absorb another part of the heat of the coolant, that is, reducing the requirements for the heat exchange efficiency of the refrigerant and the coolant in the liquid cooling unit, which can keep the fan in the condenser at a low speed, reduce the energy consumption of the liquid cooling unit, and reduce the noise generated by the liquid cooling unit.

[0022] As a preferred embodiment of the present invention, it also includes multiple battery packs, a first heat exchanger for dissipating heat or providing heat for the refrigerant flowing through the condenser in the chiller, the circulation pipeline is provided with a second liquid inlet main pipeline for providing coolant to the multiple battery packs in the energy storage battery cabinet, a second liquid outlet main pipeline for circulating the coolant flowing out of the multiple battery packs in the energy storage battery cabinet, a second water pump located on the second liquid inlet main pipeline, a third branch pipeline connected in parallel with the second water pump, and a sixth valve for controlling the coolant to flow through the first heat exchanger, a seventh valve for controlling the coolant to flow through the phase change heat storage device, an eighth valve for controlling the coolant to flow through the chiller, a ninth valve for controlling the coolant to flow through the second water pump, and a tenth valve for controlling the coolant to flow through the third branch pipeline, and the chiller, the first heat exchanger, and the phase change heat storage device are connected in parallel with each other; One end of the parallel connection of the chiller, the first heat exchanger, and the phase-change heat storage device is connected to the second liquid outlet main pipeline, and the other end is connected to the second liquid inlet pipeline, and both ends of the third branch pipeline are connected to the second liquid inlet main pipeline; It also includes a sixth detection module for detecting the ambient temperature, the sixth detection module is used to transmit the detected temperature information to the control module, the liquid cooling unit includes a condenser, the condenser includes a fan for heat dissipation, and the control module is also used to control the fan wind speed gear; When the liquid cooling unit is started to dissipate heat for the battery 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, and the control module controls the phase change heat storage device to start, and controls the fan in the condenser to maintain a low speed gear. The first heat exchanger, phase change heat storage device, and chiller dissipate heat for the battery cells in multiple battery packs through a circulation pipeline.

[0023] In this solution, the phase change heat storage device dissipates heat or supplies heat to the refrigerant flowing through the condenser in the chiller through the first heat exchanger. When dissipating heat to the refrigerant flowing through the condenser in the chiller, the phase change heat storage device shares part of the work of the fan, reduces the heat dissipation of the fan, and eliminates the need for the fan to maintain a high speed, thereby reducing the noise generated by the fan, that is, reducing the noise generated by the liquid cooling unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a control flow chart of the heat recovery system of the energy storage battery cabinet of the present invention; Figure 2 This is a schematic diagram of the coolant flow route of Example 1 of the energy storage battery cabinet heat recovery and utilization system of the present invention; Figure 3 It is a schematic diagram of the coolant flow route of Example 2 of the energy storage battery cabinet heat recovery and utilization system of the present invention. DETAILED DESCRIPTION

[0025] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0027] The accompanying drawings include: liquid cooling unit 1, phase change heat storage device 2, thermistor 3, first liquid inlet main pipeline 4, battery pack 5, first liquid outlet main pipeline 6, first branch pipeline 7, second branch pipeline 8, first valve 9, second valve 10, third valve 11, fourth valve 12, fifth valve 13, first water pump 14, first heat exchanger 15, second water pump 16, third branch pipeline 17, sixth valve 18, seventh valve 19, eighth valve 20, ninth valve 21, and tenth valve 22.

[0028] Example 1 Energy storage battery cabinet heat recovery system, such as Figure 2 As shown, it includes a circulation pipeline for circulating coolant, a phase change heat storage device 2 for absorbing, storing and supplying heat, a plurality of battery packs 5, a thermistor 3 for heating the coolant, and a liquid cooling unit 1 for dissipating heat or supplying heat to the battery cells in the plurality of battery packs 5. The circulation pipeline is provided with a first liquid inlet main pipeline 4 for providing coolant to the plurality of battery packs 5 in the energy storage battery cabinet, a first liquid outlet main pipeline 6 for receiving the coolant flowing out of the plurality of battery packs 5 in the energy storage battery cabinet, a first branch pipeline 7 connected in parallel with the phase change heat storage device 2, and a second branch pipeline 8 connected in parallel with the thermistor 3 and the liquid cooling unit 1, a first valve 9 for controlling the coolant to flow through the phase change heat storage device 2, a second valve 10 located on the first branch pipeline 7, a third valve 11 located on the second branch pipeline 8, a fourth valve 12 for controlling the coolant to flow through the thermistor 3, and a fifth valve 13 for controlling the coolant to flow through the liquid cooling unit 1.

[0029] Multiple battery packs 5 are respectively connected to the first liquid inlet main pipeline 4 and the first liquid outlet main pipeline 6, the thermistor 3 and the liquid cooling unit 1 are connected in parallel, one end of the parallel line of the first branch pipeline 7 and the phase change heat storage device 2 is connected to the first liquid outlet main pipeline 6, and the other end is connected in parallel and converges to be connected to the first intermediate pipeline, the other end of the parallel line of the second branch pipeline 8, the thermistor 3, and the liquid cooling unit 1 is connected to the first liquid inlet main pipeline 4, and the other end is connected in parallel and converges to be connected to the first intermediate pipeline, and a first water pump 14 is provided on the first intermediate pipeline.

[0030] In this embodiment, a plurality of battery packs 5, a first liquid outlet main pipeline 6, a second valve 10, a first branch pipeline 7, a first water pump 14, a first intermediate pipeline, a fifth valve 13, a liquid cooling unit 1, and a first liquid inlet main pipeline 4 are sequentially connected to form a first circuit for cooling or supplying heat to the battery cell; A plurality of battery packs 5, a first liquid outlet main pipeline 6, a first valve 9, a phase change heat storage device 2, a first water pump 14, a first intermediate pipeline, a third valve 11, a second branch pipeline 8, and a first liquid inlet main pipeline 4 are sequentially connected to form a second circuit for absorbing and storing heat generated by the battery cells and dissipating heat for the plurality of battery cells, or providing heat for the battery cells in the plurality of battery packs 5; A third circuit for supplying heat to the cells in the plurality of battery packs 5 is formed by sequentially connecting a plurality of battery packs 5, a first liquid outlet main pipeline 6, a first valve 9, a phase change heat storage device 2, a first water pump 14, a first intermediate pipeline, a fourth valve 12, a thermistor 3, and a first liquid inlet main pipeline 4; A plurality of battery packs 5, a first liquid outlet main pipeline 6, a first valve 9, a phase change heat storage device 2, a first water pump 14, a fifth valve 13, a liquid cooling unit 1, and a first liquid inlet main pipeline 6 are sequentially connected to form a fourth circuit for dissipating heat for the battery cells and absorbing and storing heat generated by the battery cells.

[0031] In this embodiment, the liquid cooling 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 loop for the circulation of refrigerant. The coolant flowing in the circulation pipeline passes through the liquid cooling plate to dissipate heat or provide heat for the battery cell and exchanges heat with the refrigerant through the second heat exchanger.

[0032] 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 pipeline, the phase change material dissipates heat or supplies heat to the coolant.

[0033] In this embodiment, the current energy storage system (such as an energy storage battery cabinet, an energy storage container) can be charged and discharged twice a day. The phase change heat storage device in this embodiment absorbs the stored heat when the energy storage system is charged or discharged once, which can meet the heat demand of the battery cells in the energy storage system for a whole day, and can reduce the use of the liquid cooling unit, save energy, and reduce noise. In addition, in this embodiment, the phase change heat storage device and the liquid cooling unit are connected in series, that is, the phase change heat storage device is directly connected to the main pipe where the coolant flows, which can improve the heat exchange efficiency of the coolant. In addition, the phase change heat storage device itself generates little noise during operation. The phase change heat storage device and the liquid cooling unit can be used together to reduce the overall noise.

[0034] 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, the power on or off of the thermistor 3, the fan speed gear, and the power off or start-up of the energy storage battery cabinet, as well as a first detection module for detecting the temperature of the battery cells in the battery pack 5, a second detection module for detecting the temperature of the coolant between the first liquid outlet main pipeline 6 and the phase change heat storage device 2, a third detection module for detecting the temperature of the coolant on the first intermediate pipeline, a fourth detection module for detecting the temperature of the coolant on the first liquid inlet main pipeline 4, and a fifth detection module for detecting the ambient temperature.

[0035] The first detection module, the second detection module, the third detection module, the fourth detection module, and the fifth detection module are used to transmit the detected temperature information to the control module.

[0036] In this embodiment, the third detection module is used to detect the temperature of the coolant between the phase change heat storage device 2 and the liquid cooling unit 1 and the temperature of the coolant between the phase change heat storage device 2 and the thermistor 3 .

[0037] When the temperature information received by the control module from the first detection module is higher than the preset first temperature threshold, that is, the battery cell temperature is higher than the normal operating temperature of the battery cell, the control module controls the liquid cooling unit 1 to start, and the liquid cooling unit 1 dissipates heat for the battery cells in the multiple battery packs 5 through the first circuit.

[0038] When the liquid cooling unit 1 is started to dissipate heat for the battery cells in 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 general ambient temperature, the control module controls the phase change heat storage device 2 to start, and controls the fan in the condenser to maintain a low speed gear, and the phase change heat storage device 2 and the liquid cooling unit 1 dissipate heat for the battery cells in multiple battery packs 5 through the fourth circuit, and absorb and store the heat generated by the battery cells.

[0039] When the control module receives temperature information from the second detection module that is higher than a preset second temperature threshold, that is, at this time, 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, switching from the first circuit to the second circuit, and the phase change heat storage device 2 dissipates heat for the battery cells in the multiple battery packs 5 through the second circuit, and at the same time absorbs and stores the heat generated by the battery cells in the multiple battery packs 5.

[0040] When the phase change heat storage device 2 is started to absorb the heat generated by multiple battery cells and store heat, the temperature information received by the control module from the third detection module is higher than the preset third temperature threshold, that is, the temperature of the coolant located in the first intermediate pipeline at this time is higher than the coolant temperature required to dissipate heat for the battery cells. The control module controls the liquid cooling unit 1 to start, and the phase change heat storage device 2 and the liquid cooling unit 1 cooperate to dissipate heat for the battery cells in the multiple battery packs 5 through the fourth circuit, and at the same time absorb the heat generated by the multiple battery cells in the battery pack 5 and store heat.

[0041] When the control module receives temperature information from the first detection module that is lower than a preset first temperature threshold, that is, the battery cell temperature is lower than the normal operating temperature of the battery cell, the control module controls the phase change heat storage device 2 to start, and the phase change heat storage device 2 provides heat for multiple battery cells through the second circuit. In this embodiment, the phase change heat storage device 2 has completed heat storage before use.

[0042] When the phase change heat storage device 2 is started to provide heat for multiple battery cells, the temperature information received by the control module from the third detection module is lower than the preset fourth temperature threshold, that is, the temperature of the coolant in the first intermediate pipeline is lower than the coolant temperature required to provide heat for the battery cells. The control module controls the thermistor 3 to be connected to the power supply, and the phase change heat storage device 2 and the thermistor 3 cooperate to provide heat for the battery cells in the multiple battery packs 5 through the third circuit.

[0043] When the control module receives temperature information from the fourth detection module that is outside the third temperature threshold and the fourth temperature threshold, the control module controls the energy storage battery cabinet to cut off power.

[0044] Example 2 like Figure 3As shown, this embodiment is basically the same as Embodiment 1, except that it further includes a plurality of battery packs 5, a first heat exchanger 15 for dissipating heat or supplying heat to the refrigerant flowing through the condenser in the chiller, a second liquid inlet main pipeline for providing coolant to the plurality of battery packs 5 in the energy storage battery cabinet, a second liquid outlet main pipeline for receiving the coolant flowing out of the plurality of battery packs 5 in the energy storage battery cabinet, a second water pump 16 located on the second liquid inlet main pipeline, a third branch pipeline 17 connected in parallel with the second water pump 16, a sixth valve 18 for controlling the coolant to flow through the first heat exchanger 15, a seventh valve 19 for controlling the coolant to flow through the phase change heat storage device 2, an eighth valve 20 for controlling the coolant to flow through the chiller, a ninth valve 21 for controlling the coolant to flow through the second water pump 16, and a tenth valve 22 for controlling the coolant to flow through the third branch pipeline 17, and the chiller, the first heat exchanger 15, and the phase change heat storage device 2 are connected in parallel with each other.

[0045] One end of the chiller, the first heat exchanger 15 and the phase change heat storage device 2 in parallel is connected to the second liquid outlet main pipeline, and the other end is connected to the second liquid inlet pipeline. Both ends of the third branch pipeline 17 are connected to the second liquid inlet main pipeline.

[0046] In this embodiment, a plurality of battery packs 5, a second liquid outlet main pipeline, a liquid cooling unit 1, a third branch pipeline 17, and a second liquid inlet main pipeline are sequentially connected to form a fifth circuit for dissipating heat or supplying heat to the battery cells; The liquid cooling unit 1, the first heat exchanger 15, and the phase change heat storage device 2 are connected in sequence to form a sixth circuit for dissipating heat or supplying heat to the refrigerant. In this embodiment, the first heat exchanger 15 is connected to the condenser in the liquid cooling unit 1, that is, the pipeline passing through the phase change heat storage device is close to the pipeline through which the refrigerant in the condenser flows. The phase change heat storage device dissipates heat for the refrigerant in the liquid cooling unit 1 and absorbs and stores heat, or supplies heat; A plurality of battery packs 5, a second liquid outlet main pipeline, a phase change heat storage device 2, a second water pump 16, and a second liquid inlet main pipeline are sequentially connected to form a sixth circuit for supplying heat to the battery cells.

[0047] It also includes a sixth detection module for detecting the 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, the condenser includes a fan for heat dissipation, and the control module is also used to control the fan wind speed gear; When the liquid cooling unit 1 is started to dissipate heat for the battery 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, that is, the ambient temperature is higher than the general ambient temperature at this time. The control module controls the phase change heat storage device 2 to start, and controls the fan in the condenser to maintain a low speed gear. The first heat exchanger 15, the phase change heat storage device 2, and the chiller dissipate heat for the battery cells in the multiple battery packs 5 through a circulation pipeline.

[0048] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A heat recovery system for an energy storage battery cabinet, comprising a circulation pipeline for circulating a coolant and a liquid cooling unit for dissipating heat or providing heat to multiple battery cells in a battery pack. The liquid cooling unit can dissipate heat or provide heat to multiple battery cells in a battery pack through the circulation pipeline alone, characterized in that: It also includes a phase-change heat storage device, which can dissipate heat for multiple battery cells in a plurality of battery packs through a circulation pipeline alone, and simultaneously absorb and store the heat generated by multiple battery cells in the battery packs, or provide heat for multiple battery cells in the battery packs. The phase-change heat storage device and the liquid cooling unit can cooperate to dissipate heat for multiple battery cells in a plurality of battery packs through a circulation pipeline, and absorb and store the heat generated by multiple battery cells in the battery packs, or provide heat for multiple battery cells in the battery packs.

2. The energy storage battery cabinet heat recovery system according to claim 1 is characterized in that: It also includes a control module for controlling the start and stop of the phase change heat storage device and the start and stop of the liquid cooling unit, as well as a first detection module for detecting the temperature of the battery cells in the battery pack, and a second detection module for detecting the temperature of the coolant between the first liquid outlet main pipeline and the phase change heat storage device, wherein the first detection module and the second detection module are used to transmit the detected temperature information to the control module; When the temperature information received by the control module from the first detection module is higher than a preset first temperature threshold, the control module controls the liquid cooling unit to start, and the liquid cooling unit dissipates heat for the battery cells in the multiple battery packs through a circulation pipeline; When the temperature information received by the control module from the second detection module is higher than a preset second temperature threshold, the control module controls the liquid cooling unit to be turned off and the phase change heat storage device to be started, and the phase change heat storage device dissipates heat for the battery cells in the multiple battery packs through the circulation pipeline, and absorbs and stores the heat generated by the battery cells in the multiple battery packs at the same time; When the control module receives temperature information from the first detection module that is lower than a preset first temperature threshold, the control module controls the phase change heat storage device to start, and the phase change heat storage device provides heat to multiple battery cells through a circulation pipeline.

3. The energy storage battery cabinet heat recovery system according to claim 2 is characterized in that: It also includes a third detection module for detecting the temperature of the coolant between the phase-change heat storage device and the liquid cooling unit, and the third detection module is used to transmit the detected temperature information to the control module; When the phase change heat storage device is started to absorb the heat generated by multiple battery cells and store heat, the control module receives temperature information from the third detection module that is higher than the preset third temperature threshold, and the control module controls the liquid cooling unit to start. The phase change heat storage device and the liquid cooling unit cooperate to dissipate heat for the battery cells in the multiple battery packs through the circulation pipeline, and at the same time absorb the heat generated by the multiple battery cells in the battery pack and store heat.

4. The energy storage battery cabinet heat recovery system according to claim 3 is characterized in that: It also includes a thermistor for heating the coolant, 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 powered on or off; When the phase change heat storage device is started to provide heat for multiple battery cells, the control module receives temperature information from the third detection module that is lower than a preset fourth temperature threshold, and the control module controls the thermistor to be energized. The phase change heat storage device and the thermistor cooperate to provide heat for multiple battery cells in the battery pack through a circulation pipeline.

5. The energy storage battery cabinet heat recovery system according to claim 2 is characterized in that: The control module is also used to control the power off or start 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 pipeline, and 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 temperature threshold and the fourth temperature threshold, the control module controls the energy storage battery cabinet to cut off power.

6. The energy storage battery cabinet heat recovery system according to claim 1 is characterized in that: It also includes a plurality of battery packs, wherein the circulation pipeline is provided with a first liquid inlet main pipeline for providing cooling liquid to the plurality of battery packs in the energy storage battery cabinet, a first liquid outlet main pipeline for circulating the cooling liquid flowing out of the plurality of 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, and a first valve for controlling the cooling liquid to flow 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 cooling liquid to flow through the liquid cooling unit; The multiple battery packs are respectively connected to the first liquid inlet main pipeline and the first liquid outlet main pipeline. One end of the first branch pipeline and the phase change heat storage device parallel circuit is connected to the first liquid outlet main pipeline, and the other end is connected in parallel and converges to connect to the first intermediate pipeline. The other end of the second branch pipeline and the liquid cooling unit parallel circuit is connected to the first liquid inlet main pipeline, and the other end is connected in parallel and converges to connect to the first intermediate pipeline. A first water pump is provided on the first intermediate pipeline.

7. The energy storage battery cabinet heat recovery system according to claim 6 is 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, and the circulation pipeline is also provided with a fourth valve for controlling the coolant to flow 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 converged together to be connected to the first liquid inlet main pipeline.

8. The energy storage battery cabinet heat recovery system according to claim 2 is characterized in that: It also includes a fifth detection module for detecting the ambient temperature, the fifth detection module is used to transmit the detected temperature information to the control module, the liquid cooling unit includes a condenser, the condenser includes a fan for heat dissipation, and the control module is also used to control the fan wind speed gear; When the liquid cooling unit is started to dissipate heat for the battery 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, and the control module controls the phase change heat storage device to start, and controls the fan in the condenser to maintain a low speed gear. The phase change heat storage device and the liquid cooling unit dissipate heat for the battery cells in multiple battery packs through a circulation pipeline.

9. The energy storage battery cabinet heat recovery system according to claim 1, characterized in that: It also includes a plurality of battery packs, a first heat exchanger for dissipating heat or providing heat for the refrigerant flowing through the condenser in the chiller, the circulation pipeline is provided with a second liquid inlet main pipeline for providing coolant to the plurality of battery packs in the energy storage battery cabinet, a second liquid outlet main pipeline for circulating the coolant flowing out of the plurality of battery packs in the energy storage battery cabinet, a second water pump located on the second liquid inlet main pipeline, a third branch pipeline connected in parallel with the second water pump, and a sixth valve for controlling the coolant to flow through the first heat exchanger, a seventh valve for controlling the coolant to flow through the phase change heat storage device, an eighth valve for controlling the coolant to flow through the chiller, a ninth valve for controlling the coolant to flow through the second water pump, and a tenth valve for controlling the coolant to flow through the third branch pipeline, and the chiller, the first heat exchanger, and the phase change heat storage device are connected in parallel with each other; One end of the parallel connection of the chiller, the first heat exchanger, and the phase-change heat storage device is connected to the second liquid outlet main pipeline, and the other end is connected to the second liquid inlet pipeline, and both ends of the third branch pipeline are connected to the second liquid inlet main pipeline; It also includes a sixth detection module for detecting the ambient temperature, the sixth detection module is used to transmit the detected temperature information to the control module, the liquid cooling unit includes a condenser, the condenser includes a fan for heat dissipation, and the control module is also used to control the fan wind speed gear; When the liquid cooling unit is started to dissipate heat for the battery 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, and the control module controls the phase change heat storage device to start, and controls the fan in the condenser to maintain a low speed gear. The first heat exchanger, phase change heat storage device, and chiller dissipate heat for the battery cells in multiple battery packs through a circulation pipeline.

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