Energy storage heat management system, energy storage system and photovoltaic energy storage system

Abstract

The invention discloses an energy storage thermal management system, an energy storage system and a photovoltaic energy storage system, and belongs to the technical field of energy storage. The energy storage heat management system comprises a heat exchange circulation loop which comprises a compressor, a condenser and an evaporation flow path, wherein the evaporation flow path comprises an expansion valve and a first path of an evaporator; the first heat exchange channel comprises an energy storage battery liquid cooling channel and a first water pump, and the first heat exchange channel is connected with the second path of the evaporator; the second heat exchange passage comprises a first radiator and a driving passage which are connected in parallel, the driving passage comprises a second water pump and an electronic device radiating channel, the second heat exchange passage is connected with the second path of the evaporator, and the working parameters of the first water pump are different from those of the second water pump; the three-way valve comprises a first valve port, a second valve port and a third valve port, the first valve port is connected to the first heat exchange passage, the second valve port is connected to the second heat exchange passage, and the third valve port is connected to the second path of the evaporator. By using the structure, the cooling liquid flow requirements of the energy storage battery and the electronic device are considered.

Description

Technical Field

[0001] The present application belongs to the field of energy storage technology, and in particular relates to an energy storage thermal management system, an energy storage system and a photovoltaic energy storage system. Background Art

[0002] In the related art, when the ambient temperature is low, the energy storage thermal management system simultaneously performs natural liquid cooling on the energy storage batteries and electronic devices. However, in actual operation, since the amount of cooling required by the energy storage batteries and electronic devices is often very different, it is difficult for the energy storage thermal management system to take into account the cooling requirements of the energy storage batteries and electronic devices, resulting in the overall cooling effect not meeting expectations. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an energy storage thermal management system, an energy storage system and a photovoltaic energy storage system, which take into account the requirements of the cooling fluid flow of energy storage batteries and electronic devices, and at the same time meet the heat dissipation requirements of energy storage batteries and electronic devices.

[0004] In a first aspect, the present application provides an energy storage thermal management system, comprising:

[0005] A heat exchange circulation loop includes a compressor, a condenser and an evaporation flow path, wherein the evaporation flow path includes an expansion valve and a first path of an evaporator connected in series;

[0006] A first heat exchange path, comprising a connected energy storage battery liquid cooling channel and a first water pump, and an inlet of the first heat exchange path is connected to an outlet of the second path of the evaporator;

[0007] a second heat exchange path, comprising a first radiator and a driving path connected in parallel, the driving path comprising a second water pump and an electronic device heat dissipation channel connected thereto, and an outlet of the second heat exchange path being connected to an inlet of a second path of the evaporator, wherein an operating parameter of the first water pump is different from an operating parameter of the second water pump;

[0008] The three-way valve includes first to third valve ports, wherein the first valve port is connected to the outlet of the first heat exchange passage, the second valve port is connected to the inlet of the second heat exchange passage, and the third valve port is connected to the inlet of the second path of the evaporator.

[0009] According to the energy storage thermal management system of the present application, by setting the working parameters of the first water pump and the second water pump, it is achieved that in the natural cooling mode, the coolant is first diverted through the energy storage battery and then part of the coolant passes through the electronic device, and the first water pump and the second water pump are used to reasonably distribute the flow to the first radiator and the drive passage, thereby taking into account the coolant flow requirements of the energy storage battery and the electronic device, and then meeting the heat dissipation requirements of the energy storage battery and the electronic device at the same time; while reducing the pipeline resistance of the water side components, the problem of uneven temperature caused by mixed liquid is alleviated, and the energy consumption of the entire energy storage thermal management system is reduced.

[0010] According to one embodiment of the present application, the driving path further includes:

[0011] A second radiator is connected to an outlet of the heat dissipation channel of the electronic device.

[0012] According to the energy storage thermal management system of the present application, through the parallel layout design of the first radiator and the second radiator, combined with the setting of the working parameters of the first water pump and the second water pump, the different heat dissipation requirements of the energy storage battery and the electronic devices are further met, while the heat dissipation efficiency of the energy storage battery and the electronic devices is significantly increased, and the overall heat dissipation capacity of the energy storage thermal management system in the natural cooling mode is optimized. In addition, in the active cooling mode, the heat dissipation capacity of the first radiator and the second radiator is fully utilized, which makes up for the defect of insufficient heat dissipation of a single radiator, thereby increasing the use width of electronic devices.

[0013] According to one embodiment of the present application, a plurality of evaporation flow paths are provided, and the plurality of evaporation flow paths are connected in parallel, the inlet of the first heat exchange path is connected to the outlet of the second path of the plurality of evaporators, the outlet of the second heat exchange path is connected to the inlet of the second path of the plurality of evaporators, and the third valve port is connected to the inlet of the second path of the plurality of evaporators.

[0014] According to one embodiment of the present application, the energy storage thermal management system further includes:

[0015] A heater is connected between the third valve port and an inlet of the second path of the evaporator and is connected in parallel with the second heat exchange path.

[0016] According to one embodiment of the present application, the energy storage thermal management system further includes:

[0017] A water tank, wherein an air inlet of the water tank can be selectively connected to the first heat exchange passage, and at least one of the first heat exchange passage and the driving passage is provided with a liquid replenishing port.

[0018] According to one embodiment of the present application, the energy storage thermal management system has a first operating mode. In the first operating mode, the compressor, the first water pump, the second water pump and the first radiator are working, the second path of the evaporator and the first heat exchange path are connected end to end, and the first radiator and the drive path are connected end to end.

[0019] According to one embodiment of the present application, the energy storage thermal management system has a second operating mode. In the second operating mode, the first water pump, the second water pump and the first radiator are working, the compressor is stopped, and the second path of the evaporator, the first heat exchange path and the second heat exchange path are connected end to end in sequence.

[0020] According to one embodiment of the present application, the energy storage thermal management system has a third operating mode. In the third operating mode, the first water pump and the second water pump are working, the compressor and the first radiator are stopped, and the second path of the evaporator, the first heat exchange path and the second heat exchange path are connected end to end in sequence.

[0021] According to one embodiment of the present application, the energy storage thermal management system has a fourth operating mode. In the fourth operating mode, the heater, the first water pump and the second water pump are working, the compressor and the first radiator are stopped, the second path of the evaporator, the first heat exchange path and the heater are connected end to end in sequence, and the first radiator and the drive path are connected end to end.

[0022] According to one embodiment of the present application, the energy storage thermal management system has a fifth operating mode. In the fifth operating mode, the first water pump and the second water pump are working, the compressor and the first radiator are stopped, and the second path of the evaporator, the first heat exchange path and the second heat exchange path are connected end to end in sequence.

[0023] In a second aspect, the present application provides an energy storage system, the energy storage system comprising:

[0024] Energy storage batteries and electronic devices;

[0025] In the energy storage thermal management system as described in any of the above schemes, the energy storage thermal management system is electrically connected to the energy storage battery and the electronic device.

[0026] According to the energy storage system of the present application, through the setting of the above-mentioned energy storage thermal management system, it is achieved that in the natural cooling mode, the coolant first passes through the energy storage battery and then passes through the electronic device. The first water pump and the second water pump are used to reasonably distribute the flow rate to the first radiator and the driving passage, so as to take into account the flow rate requirements of the energy storage battery and the electronic device coolant, and then meet the heat dissipation requirements of the energy storage battery and the electronic device at the same time; while reducing the pipeline resistance of the water side components, the problem of uneven temperature caused by mixed liquid is alleviated, and the energy consumption of the entire energy storage thermal management system is reduced; in addition, a variety of thermal management modes can be realized, and the optimal mode can be selected according to the ambient temperature and the condition of the energy storage battery itself, so as to reduce the energy consumption of the product throughout its life cycle, thereby improving the comprehensive use performance and thus improving the system operation energy efficiency.

[0027] In a third aspect, the present application provides a photovoltaic energy storage system, the photovoltaic energy storage system comprising:

[0028] Such as the energy storage system mentioned above;

[0029] A photovoltaic power generation system is used to supply power to the energy storage system.

[0030] According to the photovoltaic energy storage system of the present application, through the configuration of the above energy storage system and the configuration of the above energy storage thermal management system, it is achieved that in the natural cooling mode, the coolant is first diverted through the energy storage battery and then part of the coolant passes through the electronic device, and the first water pump and the second water pump are used to reasonably distribute the flow rate to the first radiator and the drive passage, so as to take into account the flow rate requirements of the energy storage battery and the electronic device coolant, and thus meet the heat dissipation requirements of the energy storage battery and the electronic device at the same time; while reducing the pipeline resistance of the water side components, the problem of uneven temperature caused by mixed liquid is alleviated, and the energy consumption of the entire energy storage thermal management system is reduced; in addition, a variety of thermal management modes can be realized, and the optimal mode can be selected according to the ambient temperature and the condition of the energy storage battery itself, so as to reduce the energy consumption of the product throughout its life cycle, thereby improving the comprehensive use performance, and thus improving the system operation energy efficiency.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 is a schematic diagram of the structure of the energy storage system provided in the embodiment of the present application;

[0034] Figure 2is a schematic diagram of the structure of the energy storage system provided in the embodiment of the present application in the first working mode and the fourth working mode;

[0035] Figure 3 It is a schematic diagram of the structure of the energy storage system provided in the embodiment of the present application in the second working mode, the third working mode and the fifth working mode.

[0036] Reference numerals:

[0037] Energy storage system 1;

[0038] Energy storage battery 10, electronic device 20;

[0039] Heat exchange circulation loop 30, compressor 31, condenser 32, evaporation flow path 33, expansion valve 331, evaporator 332;

[0040] A first heat exchange passage 40, an energy storage battery liquid cooling passage 41, and a first water pump 42;

[0041] A second heat exchange passage 50, a first radiator 51, a driving passage 52, an electronic device heat dissipation channel 521, a second water pump 522, and a second radiator 523;

[0042] Three-way valve 60 , water tank 70 , heater 80 . DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0044] The present application provides an energy storage thermal management system.

[0045] Reference below Figure 1-Figure 3 An energy storage thermal management system according to an embodiment of the present application is described.

[0046] In some embodiments, Figure 1 As shown, the energy storage thermal management system includes: a heat exchange circulation loop 30 , a first heat exchange passage 40 , a second heat exchange passage 50 and a three-way valve 60 .

[0047] The heat exchange circulation loop 30 includes a compressor 31, a condenser 32 and an evaporation flow path 33, the evaporation flow path 33 includes an expansion valve 331 and a first path of the evaporator 332 connected in series; the first heat exchange path 40 includes a connected energy storage battery liquid cooling channel 41 and a first water pump 42, and the inlet of the first heat exchange path 40 is connected to the outlet of the second path of the evaporator 332; the second heat exchange path 50 includes a first radiator 51 and a drive path 52 connected in parallel, the drive path 52 includes a connected second water pump 522 and an electronic device heat dissipation channel 521, and the outlet of the second heat exchange path 50 is connected to the inlet of the second path of the evaporator 332, wherein the working parameters of the first water pump 42 are different from those of the second water pump 522; the three-way valve 60 includes first to third valve ports A3, the first valve port A1 is connected to the outlet of the first heat exchange path 40, the second valve port A2 is connected to the inlet of the second heat exchange path 50, and the third valve port A3 is connected to the inlet of the second path of the evaporator 332.

[0048] Among them, Figure 1-Figure 3 As shown, the energy storage battery liquid cooling channel 41 can be connected to the heat exchange part of the energy storage battery 10, and the coolant can exchange heat with the energy storage battery 10 through the energy storage battery liquid cooling channel 41 to achieve thermal management of the energy storage battery 10; the electronic device 20 liquid cooling channel can be connected to the heat exchange part of the electronic device 20, and the coolant can exchange heat with the electronic device 20 through the electronic device 20 liquid cooling channel to achieve thermal management of the electronic device 20.

[0049] It should be noted that the electronic device 20 may be a high-heat generating device in the energy storage system 1. Specifically, the electronic device 20 may include but is not limited to a power conversion component, a communication module, a detection module or an interactive module, etc., which is not limited here.

[0050] For example, in some embodiments, the electronic device 20 is a power conversion component.

[0051] In this embodiment, if Figure 1-Figure 3 As shown, the energy storage thermal management system can be configured with multiple working modes. In each working mode, the temperature control method for the energy storage battery 10 and the electronic device 20 is different. The multiple working modes may include but are not limited to: First, in the active cooling mode, the evaporator 332 of the heat exchange circulation loop 30 can dissipate heat for the energy storage battery 10, and the first radiator 51 dissipates heat for the electronic device 20; second, in the natural cooling mode, the first radiator 51 dissipates heat for the energy storage battery 10 and the electronic device 20; third, in the active temperature equalization mode, the coolant is driven to circulate to promote the internal temperature equalization of the energy storage battery 10 and the electronic device.

[0052] Since the working parameters of the first water pump 42 and the working parameters of the second water pump 522 are different, the water pumping amount per unit time of the first water pump 42 and the water pumping amount per unit time of the second water pump 522 are also correspondingly different.

[0053] The first water pump 42 and the second water pump 522 are both common water pump products known on the market, and therefore the types, structures and operating parameters of the first water pump 42 and the second water pump 522 are all properties of water pumps known and common in the art. Specifically, the operating parameters of the first water pump 42 may include but are not limited to input power, duty cycle or rotation speed, etc., and the operating parameters of the second water pump 522 may include but are not limited to input power, duty cycle or rotation speed, etc., which are not limited here.

[0054] It is understandable that the energy storage battery 10 and the electronic device 20 have different operating temperature ranges and heat dissipation requirements. Specifically, the heat dissipation requirement of the energy storage battery 10 is often much greater than that of the electronic device 20. Therefore, the amount of coolant required by the energy storage battery 10 when dissipating heat is also much greater than the amount of coolant required by the electronic device 20 when dissipating heat. Taking the electronic device 20 as an inverter as an example, the energy storage battery 10 usually operates best between 20°C and 35°C, while the inverter can operate in a wider temperature range (25°C to 60°C).

[0055] In actual implementation, Figure 3 As shown, the estimated pipeline resistance is combined with the flow rate and the external head requirement, and the duty ratio of the first water pump 42 and the second water pump 522 can be adjusted to achieve the corresponding flow rate and head requirements. Specifically, the first water pump 42 and the second water pump 522 can use the same water pump product, and the duty ratio of the first water pump 42 is set to be greater than the duty ratio of the second water pump 522, so as to achieve the purpose of more coolant passing through the energy storage battery 10 per unit time than the coolant passing through the electronic device 20 per unit time. In this case, when the energy storage thermal management system switches to the above-mentioned natural cooling mode, under the driving action of the first water pump 42, the low-temperature coolant passes through the energy storage battery liquid cooling channel 41, thereby To take away a large amount of heat from the energy storage battery 10, since the first radiator 51 and the driving passage 52 are connected in parallel, a portion of the medium-temperature coolant after leaving the energy storage battery liquid cooling channel 41 passes through the electronic device heat dissipation channel 521 under the driving action of the second water pump 522, and further takes away a large amount of heat from the electronic device 20, and the remaining part of the medium-temperature coolant is diverted to the first radiator 51 for heat dissipation and cooling, and then the extremely low-temperature coolant after leaving the first radiator 51 merges with the high-temperature coolant leaving the electronic device heat dissipation channel 521 and is fully mixed, and finally the evenly mixed low-temperature coolant is sent to the energy storage battery liquid cooling channel 41 again by the first water pump 42.

[0056] The duty ratio of the first water pump 42 and the second water pump 522 may be adjusted within a range of 30% to 90%.

[0057] For example, in some embodiments, the duty cycle of the first water pump 42 is 75%, and the duty cycle of the second water pump 522 is 60%.

[0058] The energy storage thermal management system provided in the embodiment of the present application, through the setting of the working parameters of the first water pump 42 and the second water pump 522, realizes that in the natural cooling mode, the coolant is first diverted through the energy storage battery 10 and then part of the coolant passes through the electronic device 20, and the first water pump 42 and the second water pump 522 are used to reasonably distribute the flow rate to the first radiator 51 and the driving passage 52, so as to take into account the cooling liquid flow requirements of the energy storage battery 10 and the electronic device 20, and thus meet the heat dissipation requirements of the energy storage battery 10 and the electronic device 20 at the same time; while reducing the pipeline resistance of the water side components, it alleviates the problem of uneven temperature caused by mixed liquid, and reduces the energy consumption of the entire energy storage thermal management system.

[0059] In some embodiments, Figure 1-Figure 3 As shown, the driving passage 52 also includes: a second heat sink 523 .

[0060] The second heat sink 523 is connected to the outlet of the electronic device heat dissipation channel 521 .

[0061] The first heat sink 51 and the second heat sink 523 may be radiation heat sinks or convection heat sinks, etc., depending on system needs and design requirements, which are not limited here.

[0062] In this embodiment, the first radiator 51 and the second radiator 523 share the same fan for air cooling and heat dissipation.

[0063] In other embodiments, the first radiator 51 and the second radiator 523 use different fans for independent air cooling.

[0064] In actual implementation, Figure 3As shown, in the case of adding a second radiator 523, when the energy storage thermal management system switches to the above-mentioned active cooling mode, the first radiator 51 and the second radiator 523 jointly dissipate heat for the electronic device 20; when the energy storage thermal management system switches to the above-mentioned natural cooling mode, under the driving action of the first water pump 42, the low-temperature coolant passes through the energy storage battery liquid cooling channel 41, thereby taking away a large amount of heat from the energy storage battery 10. Since the first radiator 51 and the driving passage 52 are connected in parallel, the medium-temperature coolant after leaving the energy storage battery liquid cooling channel 41, under the driving action of the second water pump 522, a part of the medium-temperature coolant passes through the electronic device heat dissipation channel 521, further taking away a large amount of heat from the electronic device 20, and then enters the second radiator 523 for cooling, and the remaining part of the medium-temperature coolant is diverted to the first radiator 51 for heat dissipation and cooling, and then the extremely low-temperature coolant after leaving the first radiator 51 merges with the medium-low temperature coolant leaving the second radiator 523 and is fully mixed, and finally the low-temperature coolant after being mixed evenly will be sent to the energy storage battery liquid cooling channel 41 again by the first water pump 42.

[0065] The energy storage thermal management system provided in the embodiment of the present application further meets the different heat dissipation requirements of the energy storage battery 10 and the electronic device 20 through the parallel layout design of the first radiator 51 and the second radiator 523, combined with the setting of the working parameters of the first water pump 42 and the second water pump 522, and at the same time significantly increases the heat dissipation efficiency of the energy storage battery 10 and the electronic device 20, optimizes the overall heat dissipation capacity of the energy storage thermal management system in the natural cooling mode, and in addition, gives full play to the heat dissipation capacity of the first radiator 51 and the second radiator 523 in the active cooling mode, makes up for the defect of insufficient heat dissipation of a single radiator, thereby increasing the use width of the electronic device 20.

[0066] In some embodiments, Figure 1-Figure 3 As shown, a plurality of evaporation flow paths 33 are provided, and the plurality of evaporation flow paths 33 are connected in parallel, the inlet of the first heat exchange path 40 is connected to the outlet of the second path of the plurality of evaporators 332, the outlet of the second heat exchange path 50 is connected to the inlet of the second path of the plurality of evaporators 332, and the third valve port A3 is connected to the inlet of the second path of the plurality of evaporators 332.

[0067] Here, multiple means two or more.

[0068] For example, in some embodiments, Figure 1-Figure 3 As shown, two evaporation flow paths 33 are provided, and the two evaporation flow paths 33 are connected in parallel. The inlet of the first heat exchange path 40 is connected to the outlet of the second path of the two evaporators 332, the outlet of the second heat exchange path 50 is connected to the inlet of the second path of the two evaporators 332, and the third valve port A3 is connected to the inlet of the second path of the two evaporators 332.

[0069] For example, in other embodiments, three evaporation flow paths 33 are provided, and the three evaporation flow paths 33 are connected in parallel. The inlet of the first heat exchange path 40 is connected to the outlet of the second path of the three evaporators 332, the outlet of the second heat exchange path 50 is connected to the inlet of the second path of the three evaporators 332, and the third valve port A3 is connected to the inlet of the second path of the three evaporators 332.

[0070] In the related technology, in the current energy storage thermal management system, a refrigerant circuit is usually combined with a liquid cooling circuit to manage the heat of the energy storage battery and other heat-generating devices. The refrigerant circuit exchanges heat with the liquid cooling circuit through the evaporator. However, in actual applications, the evaporator is limited by its capacity and cannot directly handle the entire coolant flow, resulting in low cooling efficiency. It is difficult for the energy storage battery to dissipate heat and return to normal operating temperature in a short time, which seriously affects the working life of the energy storage battery.

[0071] It is understandable that if Figure 2 As shown, since a plurality of evaporation flow paths 33 are provided and the plurality of evaporation flow paths 33 are connected in parallel, in the active cooling mode, the first heat exchange path 40 is connected to the second paths of the plurality of evaporators 332, so that a large amount of coolant can be diverted to the second paths of the plurality of evaporators 332, each evaporator 332 only needs to process a portion of the coolant, and the heat dissipation work of each evaporator 332 can be performed simultaneously, and the low-temperature coolant cooled by the plurality of evaporators 332 is combined and sent to the energy storage battery liquid cooling channel 41 together, so as to quickly cool down the energy storage battery 10 in a high temperature environment, and shorten the time that the energy storage battery 10 is in an over-temperature state as much as possible, thereby extending the service life of the energy storage battery 10.

[0072] In some embodiments, Figure 1-Figure 3 As shown, the energy storage thermal management system further includes a heater 80 .

[0073] The heater 80 is connected between the third valve port A3 and the inlet of the second path of the evaporator 332 , and the heater 80 is connected in parallel with the second heat exchange path 50 .

[0074] In actual implementation, Figure 2 As shown, in addition to the above-mentioned active cooling mode, natural heat dissipation mode and active temperature equalization mode, the energy storage thermal management system is also configured with an electric heating mode, considering that the performance and service life of the energy storage battery 10 will be seriously affected in a low temperature environment. In the electric heating mode, the heater 80 is turned on and the third valve port A3 of the three-way valve 60 is connected. The heater 80 can heat the energy storage battery 10, and the electronic device 20 can use the low temperature environment for natural heat dissipation.

[0075] The energy storage thermal management system provided in the embodiment of the present application meets the heating demand of the energy storage battery 10 in a low temperature environment through the provision of the above-mentioned heater 80, optimizes the performance of the energy storage battery 10 in a low temperature environment, thereby extending the service life of the energy storage battery 10. At the same time, the heater is placed on the pipeline between the third valve port A3 and the inlet of the second path of the evaporator 332, so that in the natural cooling mode, the coolant can not pass through the heater 80, which greatly reduces the resistance of the circuit, which is beneficial to reducing the energy consumption of the first water pump 42 and the second water pump 522.

[0076] In some embodiments, Figure 1-Figure 3 As shown, the energy storage thermal management system further includes: a water tank 70 .

[0077] The air inlet of the water tank 70 can be selectively communicated with the first heat exchange passage 40 , and at least one of the first heat exchange passage 40 and the driving passage 52 is provided with a liquid replenishing port.

[0078] The liquid replenishing port and the exhaust port can be arranged in the first heat exchange passage 40. Specifically, the water tank 70 is connected to the first heat exchange passage 40 by Figure 1 The middle dotted line is connected to the exhaust port on the first heat exchange passage 40, and the exhaust port is located between the inlet of the heater 80 and the outlet of the energy storage battery liquid cooling channel 41; the liquid replenishing port is arranged close to the outlet of the energy storage battery heat dissipation channel, for example, the liquid replenishing port can be located between the exhaust port and the outlet of the energy storage battery liquid cooling channel 41.

[0079] In actual implementation, in addition to the above-mentioned active cooling mode, natural heat dissipation mode, active temperature equalization mode and electric heating mode, the energy storage thermal management system can also be configured with a liquid replenishment and exhaust mode. In the liquid replenishment and exhaust mode, the liquid replenishment port and the exhaust port are connected, and the water tank 70 can complete the replenishment of coolant and the discharge of internal gas during the circulation of the coolant.

[0080] The energy storage thermal management system provided in the embodiment of the present application realizes water path connection and gas path connection between the water tank 70 and the first heat exchange passage 40 through the arrangement of the water tank 70, shortens the water supply path of the water tank 70, improves the water supply efficiency, thereby speeding up the water circulation rate, and further optimizing the heat dissipation effect on the energy storage battery 10, while speeding up the exhaust speed of the water tank 70, preventing the gas from blocking the circulation of the cooling water, and optimizing the cooling effect of the water circulation.

[0081] In some embodiments, Figure 2 As shown, the energy storage thermal management system has a first working mode. In the first working mode, the compressor 31, the first water pump 42, the second water pump 522 and the first radiator 51 are working, the second path of the evaporator 332 and the first heat exchange path 40 are connected end to end, and the first radiator 51 and the drive path 52 are connected end to end.

[0082] In the case where the driving path includes the second heat sink 523, the second heat sink 523 operates.

[0083] In this embodiment, if Figure 2 As shown (the bold section in the figure indicates the flow path of the coolant), the first working mode is the above-mentioned active cooling mode. When the energy storage thermal management system switches to the first working mode, the on-off state of each valve port of the three-way valve 60 is: the first valve port A1 is connected to the third valve port A3, and the second valve port A2 is disconnected from the first valve port A1 and the third valve port A3. The coolant circulates between the second path of the evaporator 332 and the first heat exchange path 40 to achieve fluorine cooling of the energy storage battery 10 by the heat exchange circulation loop 30 under high temperature environment. The coolant circulates between the first radiator 51 and the drive path 52. When the drive path includes the second radiator 523, the first radiator 51 and the second radiator 523 can jointly achieve forced air cooling of the electronic device 20.

[0084] The energy storage thermal management system provided in the embodiment of the present application, through the design of the above-mentioned first working mode, realizes that when the temperature of the energy storage battery 10 is too high, the heat exchange circulation loop 30 is used to cool the energy storage battery 10, and the first radiator 51 and the second radiator 523 are used to cool the electronic device 20, taking into account the heat dissipation requirements of the energy storage battery 10 and the electronic device 20, and relieving a series of domino effects of thermal runaway of the energy storage battery 10 due to overheating, thereby extending the working life of the energy storage battery 10, and giving full play to the heat dissipation capacity of the first radiator 51 and the second radiator 523, thereby increasing the use width of the electronic device 20.

[0085] In some embodiments, Figure 3 As shown, the energy storage thermal management system has a second working mode. In the second working mode, the first water pump 42, the second water pump 522 and the first radiator 51 are working, the compressor 31 is stopped, and the second path of the evaporator 332, the first heat exchange path 40 and the second heat exchange path 50 are connected end to end.

[0086] In the case where the driving path includes the second heat sink 523, the second heat sink 523 operates.

[0087] In this embodiment, if Figure 3As shown in the figure (the bold section in the figure indicates the flow path of the coolant), the second working mode is the above-mentioned natural cooling mode. When the energy storage thermal management system switches to the second working mode, the on-off state of each valve port of the three-way valve 60 is: the first valve port A1 is connected to the second valve port A2, and the third valve port A3 is disconnected from the first valve port A1 and the second valve port A2. The low-temperature coolant passes through the energy storage battery liquid cooling channel 41, thereby taking away a large amount of heat from the energy storage battery 10. For the medium-temperature coolant after leaving the energy storage battery liquid cooling channel 41, a part of the medium-temperature coolant passes through the electronic device heat dissipation channel 521, further taking away a large amount of heat from the electronic device 20, and then enters the second radiator 523 for cooling, and the remaining part of the medium-temperature coolant is diverted to the first radiator 51 for heat dissipation and cooling. Then, the extremely low-temperature coolant after leaving the first radiator 51 merges with the medium-low temperature coolant leaving the second radiator 523 and is fully mixed. Finally, the low-temperature coolant after being mixed evenly will be sent to the energy storage battery liquid cooling channel 41 again.

[0088] The energy storage thermal management system provided in the embodiment of the present application, through the design of the above-mentioned second working mode, realizes that in the natural cooling mode, the coolant is first diverted through the energy storage battery 10 and then part of the coolant passes through the electronic device 20, and the first water pump 42 and the second water pump 522 are used to reasonably distribute the flow rate to the first radiator 51 and the driving passage 52, so as to take into account the cooling liquid flow requirements of the energy storage battery 10 and the electronic device 20, and thus meet the heat dissipation requirements of the energy storage battery 10 and the electronic device 20 at the same time; while reducing the pipeline resistance of the water side components, it alleviates the problem of uneven temperature caused by mixed liquid, and reduces the energy consumption of the entire energy storage thermal management system.

[0089] In some embodiments, Figure 3 As shown, the energy storage thermal management system has a third working mode. In the third working mode, the first water pump 42 and the second water pump 522 are working, the compressor 31 and the first radiator 51 are stopped, and the second path of the evaporator 332, the first heat exchange path 40 and the second heat exchange path 50 are connected end to end in sequence.

[0090] In the case where the driving path includes the second heat sink 523, the second heat sink 523 is shut down.

[0091] In this embodiment, if Figure 3 As shown in the figure (the bold section in the figure indicates the flow path of the coolant), the third working mode is the above-mentioned active temperature equalization mode. When the energy storage thermal management system switches to the third working mode, the on-off state of each valve port of the three-way valve 60 is: the first valve port A1 is connected to the second valve port A2, and the third valve port A3 is disconnected from the first valve port A1 and the second valve port A2. The coolant circulates back and forth between the second path of the evaporator 332, the first heat exchange path 40 and the second heat exchange path 50 to achieve temperature uniformity at all locations of the water side circuit.

[0092] The energy storage thermal management system provided in the embodiment of the present application, through the design of the third working mode, uses the coolant circulation to actively evenly temperature the water side circuit of the entire energy storage thermal management system. Considering that the heat dissipation pressure of the system is relatively small at this time, no additional heat dissipation configuration is required, thereby improving the temperature uniformity of multiple battery cells in the energy storage battery 10, and at the same time improving the temperature uniformity of the entire energy storage system 1 when the ambient temperature is moderate.

[0093] In some embodiments, Figure 2 As shown, the energy storage thermal management system has a fourth working mode. In the fourth working mode, the heater 80, the first water pump 42 and the second water pump 522 are working, the compressor 31 and the first radiator 51 are stopped, the second path of the evaporator 332, the first heat exchange path 40 and the heater 80 are connected end to end in sequence, and the first radiator 51 and the drive path 52 are connected end to end.

[0094] In the case where the driving path includes the second heat sink 523, the second heat sink 523 is shut down.

[0095] In this embodiment, if Figure 2 As shown in the figure (the bold section in the figure indicates the flow path of the coolant), the fourth working mode is the above-mentioned electric heating mode. When the energy storage thermal management system switches to the fourth working mode, the on-off state of each valve port of the three-way valve 60 is: the first valve port A1 is connected to the third valve port A3, and the second valve port A2 is disconnected from the first valve port A1 and the third valve port A3. The high-temperature coolant heated by the heater 80 can flow to the energy storage battery liquid cooling channel 41 to achieve heating of the energy storage battery 10 by the heater 80 in a low-temperature environment. The coolant circulates in the closed second heat exchange passage 50 to achieve natural air cooling and heat dissipation of the electronic device 20 in a low-temperature environment.

[0096] The energy storage thermal management system provided in the embodiment of the present application, through the design of the fourth working mode, realizes that when the temperature of the energy storage battery 10 is low, the heater 80 is used to heat the energy storage battery 10, so that the temperature of the energy storage battery 10 can be quickly increased, and the temperature of the energy storage battery 10 is restored to the optimal working range, thereby helping to give full play to the performance of the energy storage battery 10 and further extending the service life of the energy storage battery 10.

[0097] In some embodiments, Figure 3 As shown (the bold section in the figure indicates the flow path of the coolant), the energy storage thermal management system has a fifth working mode. In the fifth working mode, the first water pump 42 and the second water pump 522 are working, the compressor 31 and the first radiator 51 are stopped, and the second path of the evaporator 332, the first heat exchange path 40 and the second heat exchange path 50 are connected end to end in sequence.

[0098] In the case where the driving path includes the second heat sink 523, the second heat sink 523 is shut down.

[0099] In this embodiment, if Figure 3 As shown (the bold section in the figure indicates the flow path of the coolant), the fifth working mode is the above-mentioned liquid replenishment and exhaust mode. When the energy storage thermal management system switches to the fifth working mode, the on-off state of each valve port of the three-way valve 60 is: the first valve port A1 is connected to the second valve port A2, and the third valve port A3 is disconnected from the first valve port A1 and the second valve port A2. The added coolant can enter the first heat exchange path 40 from the liquid replenishment port, and then circulate back and forth between the second path of the evaporator 332, the first heat exchange path 40 and the second heat exchange path 50. With the flow of the added coolant, the excess gas in the water side pipeline can also be discharged into the water tank 70 through the exhaust port, and finally discharged from the gas outlet of the water tank 70.

[0100] The energy storage thermal management system provided in the embodiment of the present application realizes the replenishment of coolant in the water side flow path and the timely discharge of exhaust gas through the design of the above-mentioned fifth working mode, so that the cooling water in the energy storage thermal management system is always maintained at an appropriate level, reducing the probability of system overheating or other operating problems caused by insufficient cooling water, thereby effectively transferring heat from the energy storage battery 10 and the electronic device 20 to the first radiator 51 and the second radiator 523. At the same time, exhausting air to the outside can eliminate air bubbles in the water side flow path, prevent the increase of thermal resistance due to the blockage of the pipeline by bubbles, and thus improve the overall cooling efficiency of the system. In addition, timely replenishment of coolant and exhaust can reduce corrosion and sediment in the system, keep the pipeline clean, and thus reduce the maintenance frequency of the water side pipeline.

[0101] The present application also provides an energy storage system 1.

[0102] In some embodiments, Figure 1-Figure 3 As shown, the energy storage system 1 includes: an energy storage battery 10, an electronic device 20 and an energy storage thermal management system as any of the above solutions,

[0103] The energy storage thermal management system is electrically connected to the energy storage battery 10 and the electronic device 20 .

[0104] like Figure 1-Figure 3 As shown, the electronic device heat dissipation channel 521 can be installed in the heat exchange part of the electronic device 20 to achieve heat dissipation of the electronic device 20, and the energy storage battery liquid cooling channel 41 can be installed in the heat exchange part of the energy storage battery 10 to achieve heat dissipation of the energy storage battery 10.

[0105] The energy storage system 1 provided in the embodiment of the present application, through the configuration of the above-mentioned energy storage thermal management system, realizes that in the natural cooling mode, the coolant is first diverted through the energy storage battery 10 and then part of the coolant passes through the electronic device 20, and the first water pump 42 and the second water pump 522 are used to reasonably distribute the flow rate to the first radiator 51 and the driving passage 52, so as to take into account the flow rate requirements of the energy storage battery 10 and the electronic device 20, and thus meet the heat dissipation requirements of the energy storage battery 10 and the electronic device 20 at the same time; while reducing the pipeline resistance of the water side components, the problem of uneven temperature caused by mixed liquid is alleviated, and the energy consumption of the entire energy storage thermal management system is reduced; in addition, multiple thermal management modes can be realized, and the optimal mode can be selected according to the ambient temperature and the condition of the energy storage battery 10 itself, so as to reduce the energy consumption of the product throughout its life cycle, thereby improving the comprehensive use performance and thus improving the system operation energy efficiency.

[0106] The present application also provides a photovoltaic energy storage system.

[0107] In some embodiments, the photovoltaic energy storage system includes: a photovoltaic power generation system and the energy storage system 1 as described above.

[0108] The photovoltaic power generation system is used to supply power to the energy storage system 1 .

[0109] The photovoltaic power generation system may include photovoltaic modules and inverter units. The energy storage battery 10 in the energy storage system 1 may be connected to the direct current output by the photovoltaic modules, and other power modules in the energy storage system 1 may be connected to the alternating current output by the inverter unit.

[0110] The photovoltaic energy storage system provided in the embodiment of the present application, through the setting of the above-mentioned energy storage system 1, realizes that in the natural cooling mode, the coolant is first diverted through the energy storage battery 10 and then part of the coolant passes through the electronic device 20, and the first water pump 42 and the second water pump 522 are used to reasonably distribute the flow rate to the first radiator 51 and the driving passage 52, so as to take into account the cooling liquid flow requirements of the energy storage battery 10 and the electronic device 20, and thus meet the heat dissipation requirements of the energy storage battery 10 and the electronic device 20 at the same time; while reducing the pipeline resistance of the water side components, the problem of uneven temperature caused by mixed liquid is alleviated, and the energy consumption of the entire energy storage thermal management system is reduced; in addition, a variety of thermal management modes can be realized, and the optimal mode can be selected according to the ambient temperature and the condition of the energy storage battery 10 itself, so as to reduce the energy consumption of the product throughout its life cycle, thereby improving the comprehensive use performance and thus improving the system operation energy efficiency.

[0111] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0112] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0113] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0114] In the description of the present application, “plurality” means two or more.

[0115] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0116] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0117] Other structures of ... according to the embodiments of the present application, such as ... and ..., and operations are known to ordinary technicians in the field and will not be described in detail here.

[0118] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0119] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An energy storage thermal management system, characterized in that: include: A heat exchange circulation loop includes a compressor, a condenser and an evaporation flow path, wherein the evaporation flow path includes an expansion valve and a first path of an evaporator connected in series; A first heat exchange path, comprising a connected energy storage battery liquid cooling channel and a first water pump, and an inlet of the first heat exchange path is connected to an outlet of the second path of the evaporator; a second heat exchange path, comprising a first radiator and a driving path connected in parallel, the driving path comprising a second water pump and an electronic device heat dissipation channel connected thereto, and an outlet of the second heat exchange path being connected to an inlet of a second path of the evaporator, wherein an operating parameter of the first water pump is different from an operating parameter of the second water pump; The three-way valve includes first to third valve ports, wherein the first valve port is connected to the outlet of the first heat exchange passage, the second valve port is connected to the inlet of the second heat exchange passage, and the third valve port is connected to the inlet of the second path of the evaporator.

2. The energy storage thermal management system according to claim 1, characterized in that: The drive path also includes: A second radiator is connected to an outlet of the heat dissipation channel of the electronic device.

3. The energy storage thermal management system according to claim 1, characterized in that: The evaporation flow paths are arranged in plurality and the plurality of evaporation flow paths are connected in parallel, the inlet of the first heat exchange path is connected to the outlet of the second path of the plurality of evaporators, the outlet of the second heat exchange path is connected to the inlet of the second path of the plurality of evaporators, and the third valve port is connected to the inlet of the second path of the plurality of evaporators.

4. The energy storage thermal management system according to claim 1, characterized in that: Also includes: A heater is connected between the third valve port and an inlet of the second path of the evaporator and is connected in parallel with the second heat exchange path.

5. The energy storage thermal management system according to claim 1, characterized in that: Also includes: A water tank, wherein an air inlet of the water tank can be selectively connected to the first heat exchange passage, and at least one of the first heat exchange passage and the driving passage is provided with a liquid replenishing port.

6. The energy storage thermal management system according to any one of claims 1 to 5, characterized in that: The energy storage thermal management system has a first operating mode. In the first operating mode, the compressor, the first water pump, the second water pump and the first radiator are working, the second path of the evaporator and the first heat exchange path are connected end to end, and the first radiator and the drive path are connected end to end.

7. The energy storage thermal management system according to any one of claims 1 to 5, characterized in that: The energy storage thermal management system has a second operating mode. In the second operating mode, the first water pump, the second water pump and the first radiator are working, the compressor is stopped, and the second path of the evaporator, the first heat exchange path and the second heat exchange path are connected end to end in sequence.

8. The energy storage thermal management system according to any one of claims 1 to 5, characterized in that: The energy storage thermal management system has a third operating mode. In the third operating mode, the first water pump and the second water pump are working, the compressor and the first radiator are stopped, and the second path of the evaporator, the first heat exchange path and the second heat exchange path are connected end to end in sequence.

9. The energy storage thermal management system according to claim 4, characterized in that: The energy storage thermal management system has a fourth operating mode. In the fourth operating mode, the heater, the first water pump and the second water pump are working, the compressor and the first radiator are stopped, the second path of the evaporator, the first heat exchange path and the heater are connected end to end in sequence, and the first radiator and the drive path are connected end to end.

10. The energy storage thermal management system according to claim 5, characterized in that: The energy storage thermal management system has a fifth working mode. In the fifth working mode, the first water pump and the second water pump are working, the compressor and the first radiator are stopped, the second path of the evaporator, the first heat exchange path and the second heat exchange path are connected end to end in sequence, and the air inlet of the water tank is connected to the first heat exchange path.

11. An energy storage system, characterized in that: include: Energy storage batteries and electronic devices; The energy storage thermal management system according to any one of claims 1 to 10, wherein the energy storage thermal management system is electrically connected to the energy storage battery and the electronic device.

12. A photovoltaic energy storage system, characterized in that: include: The energy storage system according to claim 11; A photovoltaic power generation system is used to supply power to the energy storage system.

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