Energy storage system

Abstract

The utility model discloses an energy storage system which comprises an energy storage unit, electrical equipment and a heat management unit. The heat management unit comprises a refrigeration unit, the refrigeration unit comprises a power device, a condenser and a first heat exchanger, the power device is used for providing a gaseous heat exchange medium by absorbing heat of the electrical equipment so as to drive the refrigeration unit to work, and the condenser is used for condensing the gaseous heat exchange medium into a liquid state; the first heat exchanger is used for absorbing heat of the energy storage unit through a liquid heat exchange medium; the heat management unit has a first mode; in the first mode, the power device, the condenser and the first heat exchanger are sequentially communicated end to end. According to the energy storage system, heat dissipation of the energy storage unit and the electrical equipment is realized; the power device absorbs the heat of the electrical equipment to provide the gaseous heat exchange medium to drive the refrigeration unit to work, extra heat or power is not needed, and the heat management energy consumption of the energy storage system is reduced.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic energy storage technology, and more specifically, to an energy storage system. Background Art

[0002] The energy storage units and electrical equipment in the energy storage system need to dissipate heat to ensure that the energy storage units and electrical equipment work normally.

[0003] At present, the commonly used heat dissipation methods are air cooling and liquid cooling. Among them, liquid cooling is suitable for energy storage systems with large battery capacity, and can meet the heat dissipation requirements of high heat consumption in high-rate scenarios.

[0004] In the liquid cooling method, a liquid cooling unit is used, and a cooling medium is used to cool the energy storage unit and electrical equipment. However, liquid cooling of electrical equipment will increase the heat load of the liquid cooling unit, and the thermal management energy consumption of the energy storage system is relatively large, which will also affect the heat dissipation effect of the energy storage unit.

[0005] Therefore, how to dissipate heat from the energy storage system to reduce the thermal management energy consumption of the energy storage system is a problem that needs to be urgently solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of the present application is to provide an energy storage system that reduces the thermal management energy consumption of the energy storage system while meeting the heat dissipation requirements of the energy storage system.

[0007] In order to achieve the above objectives, this application provides the following technical solutions:

[0008] An energy storage system comprises: an energy storage unit, an electrical device, and a thermal management unit;

[0009] Wherein, the thermal management unit includes a refrigeration unit, and the refrigeration unit includes: a power device, a condenser and a first heat exchanger; the power device is used to provide a gaseous heat exchange medium by absorbing the heat of the electrical equipment to drive the refrigeration unit to work; the condenser is used to condense the gaseous heat exchange medium into a liquid state; the first heat exchanger is used to absorb the heat of the energy storage unit through the liquid heat exchange medium;

[0010] The thermal management unit has a first mode; in the first mode, the power device, the condenser and the first heat exchanger are connected end to end in sequence.

[0011] Optionally, the electrical equipment includes an energy storage converter, and the power device is used to provide the gaseous heat exchange medium by absorbing heat from the energy storage converter;

[0012] And / or, the electrical equipment includes a switch box, and the power device is used to provide the gaseous heat exchange medium by absorbing heat from the switch box.

[0013] Optionally, the energy storage unit includes: an energy storage unit main body and an energy storage unit liquid cooling device; wherein, the energy storage unit liquid cooling device is used to absorb the heat of the energy storage unit main body through the energy storage unit cooling medium, and the first heat exchanger is used to absorb the heat of the energy storage unit cooling medium through the liquid heat exchange medium.

[0014] Optionally, the first heat exchanger includes a first heat exchange channel and a second heat exchange channel capable of performing heat exchange, the first heat exchange channel is used for the heat exchange medium to flow through, and the second heat exchange channel is used for the energy storage unit cooling medium to flow through;

[0015] The thermal management unit further includes a battery-side delivery pump, which is used to drive the energy storage unit cooling medium to circulate between the second heat exchange channel and the energy storage unit liquid cooling device.

[0016] Optionally, the first heat exchanger includes a heat exchange channel for the heat exchange medium to flow through, and the heat exchange channel is connected to the cooling channel of the energy storage unit so that the heat exchange medium flows through the energy storage unit;

[0017] Alternatively, the first heat exchanger is disposed on the energy storage unit, and a housing of the first heat exchanger is thermally connected to the energy storage unit.

[0018] Optionally, the refrigeration unit further includes a first throttling device, which is connected in series between the condenser and the first heat exchanger.

[0019] Optionally, the power device includes an absorber and a second heat exchanger;

[0020] Wherein, the second heat exchanger and the first heat exchanger are both in communication with the absorber;

[0021] The second heat exchanger is used to absorb the heat of the electrical equipment through an absorbent solution, so that the absorbent solution is converted from a dilute solution to a concentrated solution and water vapor, and the water vapor is the heat exchange medium in a gaseous state;

[0022] The first heat exchanger is used to absorb the heat of the energy storage unit through condensed water and evaporate it into water vapor, and the condensed water is the heat exchange medium in liquid state;

[0023] The absorber is used for receiving the water vapor provided by the first heat exchanger and the concentrated solution provided by the second heat exchanger to form the dilute solution.

[0024] Optionally, the electrical equipment includes an electrical equipment body and an electrical equipment liquid cooling device, the electrical equipment liquid cooling device is used to absorb the heat of the electrical equipment body through the electrical equipment cooling medium, and the second heat exchanger is used to absorb the heat of the electrical equipment cooling medium through the absorbent solution.

[0025] Optionally, the second heat exchanger includes a first heat exchange channel and a second heat exchange channel capable of performing heat exchange, the first heat exchange channel is used for the absorbent solution to flow through, and the second heat exchange channel is used for the electrical equipment cooling medium to flow through.

[0026] Optionally, the second heat exchanger includes a heat exchange channel for the absorbent solution to flow through, and the heat exchange channel is connected to a cooling channel of the electrical equipment so that the absorbent solution flows through the electrical equipment;

[0027] Alternatively, the second heat exchanger is disposed on the electrical device, and a housing of the second heat exchanger is thermally connected to the electrical device.

[0028] Optionally, the power device further comprises:

[0029] A refrigeration side delivery pump, the refrigeration side delivery pump is connected in series between the absorber and the second heat exchanger, and the refrigeration side delivery pump is used to drive the dilute solution to flow from the absorber to the second heat exchanger, or to drive the concentrated solution to flow from the second heat exchanger to the absorber;

[0030] And / or, a second throttling device, wherein the second throttling device is connected in series between the absorber and the second heat exchanger, and the second throttling device is used to throttle the dilute solution.

[0031] Optionally, the refrigeration unit further comprises an evaporator, the evaporator and the first heat exchanger are arranged in parallel, and the evaporator is used to evaporate the liquid heat exchange medium into the gaseous heat exchange medium;

[0032] The thermal management unit also has a second mode; in the second mode, the power device, the condenser and the evaporator are connected end to end in sequence.

[0033] Optionally, the pipeline where the evaporator is located, the pipeline where the first heat exchanger is located, and the pipeline where the condenser is located are connected through a connecting valve;

[0034] Wherein, the communication valve is located upstream of the evaporator and upstream of the first heat exchanger;

[0035] The connecting valve has a first valve position and a second valve position; when the connecting valve is in the first valve position, the connecting valve connects the condenser and the first heat exchanger, and the thermal management unit is in the first mode; when the connecting valve is in the second valve position, the connecting valve connects the condenser and the evaporator, and the thermal management unit is in the second mode.

[0036] Optionally, the thermal management unit further includes a heating device; when the thermal management unit is in the second mode, the heating device is used to heat the energy storage unit.

[0037] Optionally, the heating device is disposed on the energy storage unit, and the heating device and the energy storage unit are connected by thermal conduction;

[0038] Alternatively, the heating device is used to heat the cooling medium of the energy storage unit to heat the energy storage unit; wherein the energy storage unit, the heating device and the first heat exchanger are connected end to end in sequence.

[0039] In the energy storage system provided in the present application, in a first mode, the power device, the condenser and the first heat exchanger are connected end to end in sequence, and the liquid heat exchange medium in the first heat exchanger realizes the heat dissipation of the energy storage unit; the power device absorbs the heat of the electrical equipment to realize the heat dissipation of the electrical equipment; the heat exchange medium discharged by the first heat exchanger can be a gaseous or liquid heat exchange medium, the power device absorbs the heat of the electrical equipment to provide a gaseous heat exchange medium, and outputs a gaseous heat exchange medium to drive the refrigeration unit to work, without the need for additional heat or power, thereby effectively reducing the thermal management energy consumption of the energy storage system.

[0040] In the energy storage system provided in the present application, the heat exchange medium in liquid state flowing through the first heat exchanger dissipates heat to the energy storage unit, thereby realizing liquid cooling of the energy storage unit, which is convenient for ensuring the heat dissipation effect of the energy storage unit, thereby ensuring the safe and stable operation of the energy storage system; the power device absorbs the heat of the electrical equipment, thereby realizing the heat dissipation of the electrical equipment, thereby facilitating the heat dissipation effect of the energy storage unit, thereby ensuring the safe and stable operation of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0042] Figure 1 A schematic diagram of the structure of an energy storage system provided in an embodiment of the present application;

[0043] Figure 2 Another structural schematic diagram of the energy storage system provided in the embodiment of the present application;

[0044] Figure 3 Another structural schematic diagram of the energy storage system provided in the embodiment of the present application;

[0045] Figure 4 A schematic diagram of a structure in which a power device in an energy storage system provided in an embodiment of the present application utilizes heat from electrical equipment;

[0046] Figure 5 Another structural schematic diagram of a power device utilizing heat from electrical equipment in an energy storage system provided in an embodiment of the present application;

[0047] Figure 6 Another structural schematic diagram of the energy storage system provided in the embodiment of the present application;

[0048] Figure 7 for Figure 6 A schematic diagram of the energy storage system shown in a first mode;

[0049] Figure 8 for Figure 6 A schematic diagram of the energy storage system shown in the second mode;

[0050] Fig. 9 Another structural schematic diagram of the energy storage system provided in an embodiment of the present application.

[0051] Description of reference numerals:

[0052] 1 is an energy storage unit, 11 is an energy storage unit body, and 12 is an energy storage unit liquid cooling device;

[0053] 2 is an electrical device, 21 is a main body of the electrical device, and 22 is a liquid cooling device for the electrical device;

[0054] 3 is a thermal management unit, 3a is a refrigeration unit, 31 is a power device, 311 is an absorber, 312 is a second heat exchanger, 313 is a refrigeration side delivery pump, 314 is a refrigeration first connecting pipe, 315 is a refrigeration second connecting pipe, 316 is a second throttling device, 32 is a condenser, 33 is a first heat exchanger, 34 is a battery side delivery pump, 35 is a first throttling device, 36 is an evaporator, 37 is a connecting valve, and 38 is a heating device. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be used as limitations on the present application. As used in the specification and the appended claims of the present application, the singular expressions "one", "a kind", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the embodiments of the present application, "one or more" refers to one, two or more; "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0057] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0058] The multiple involved in the embodiments of the present application means greater than or equal to two. It should be noted that in the description of the embodiments of the present application, the words "first", "second", etc. are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0059] like Figure 1 As shown, the energy storage system provided in the embodiment of the present application includes: an energy storage unit 1, an electrical device 2, and a thermal management unit 3.

[0060] The energy storage unit 1 can be understood as a battery cluster. The energy storage unit 1 includes a plurality of battery cells, and the battery cells are connected in series, in parallel, or in series-parallel connection.

[0061] The electrical device 2 may include at least one of an energy storage converter and a switch box. In actual situations, the electrical device may also include other devices in addition to the energy storage converter and the switch box, which is not limited in the embodiments of the present application.

[0062] The thermal management unit 3 includes a refrigeration unit 3a. The refrigeration unit 3a includes: a power device 31, a condenser 32 and a first heat exchanger 33; wherein the power device 31 is used to provide a gaseous heat exchange medium by absorbing the heat of the electrical device 2 to drive the refrigeration unit 3a to work; the condenser 32 is used to condense the gaseous heat exchange medium into a liquid heat exchange medium; the first heat exchanger 33 is used to absorb the heat of the energy storage unit through the liquid heat exchange medium.

[0063] It should be noted that, when the electrical device 2 includes an energy storage inverter, the power device 31 may choose to absorb the heat of the energy storage inverter; when the electrical device 2 includes a switch box, the power device 31 may choose to absorb the heat of the switch box.

[0064] The specific types of the power device 31 and the condenser 32 are selected according to actual conditions, and are not limited in this embodiment of the present application.

[0065] The specific type of the first heat exchanger 33 is selected according to actual conditions. For example, the first heat exchanger 33 may be a plate heat exchanger, which is not limited in the embodiment of the present application.

[0066] The thermal management unit 3 has a first mode; in the first mode, the power device 31, the condenser 32 and the first heat exchanger 33 are connected end to end in sequence, so that a circulation loop for the circulation of the heat exchange medium can be formed.

[0067] In order to reduce the temperature of the heat exchange medium entering the first heat exchanger 33, the refrigeration unit 3a may further include a first throttling device 35, which is connected in series between the condenser 32 and the first heat exchanger 33. Figure 1 As shown, the first throttling device 35 is connected in series to the connecting pipe connecting the condenser 32 and the first heat exchanger 33 , and the first throttling device 35 is located between the condenser 32 and the first heat exchanger 33 .

[0068] The first throttling device 35 can cool down the heat exchange medium discharged from the condenser 32 by throttling the heat exchange medium discharged from the condenser 32, thereby increasing the temperature difference between the heat exchange medium and the energy storage unit 1, improving the absorption rate of the heat exchange medium to the heat of the energy storage unit 1, and further improving the heat dissipation effect and heat dissipation efficiency of the energy storage unit 1. Moreover, the first throttling device 35 can also reduce the pressure of the heat exchange medium to a specified pressure (the specified pressure is the maximum pressure of the heat exchange medium from liquid to gas when the temperature of the heat exchange medium is constant. In other words, when the pressure of the heat exchange medium is the specified pressure, the heat exchange medium only needs to absorb a small amount of heat to change from liquid to gas), making it easier for the heat exchange medium to change from liquid to gas. It can be seen that the first throttling device 35 can optimize the ability of the heat exchange medium in the first heat exchanger 33 to absorb the heat of the energy storage unit 1, thereby optimizing the heat dissipation effect of the energy storage unit 1, and further optimizing the heat dissipation effect of the energy storage system.

[0069] The first throttling device 35 can be a capillary tube, an electromagnetic expansion valve or a throttling valve, etc., which is not limited in the embodiment of the present application.

[0070] In the energy storage system provided in the embodiment of the present application, in a first mode, the power device 31, the condenser 32 and the first heat exchanger 33 are connected end to end in sequence, and the liquid heat exchange medium in the first heat exchanger 33 realizes the heat dissipation of the energy storage unit 1; the power device 31 absorbs the heat of the electrical equipment 2 to realize the heat dissipation of the electrical equipment 2; the heat exchange medium discharged by the first heat exchanger 33 can be a gaseous or liquid heat exchange medium, the power device 31 absorbs the heat of the electrical equipment 2 to provide a gaseous heat exchange medium, and outputs a gaseous heat exchange medium to drive the refrigeration unit 3a to work, without the need for additional heat or power, thereby effectively reducing the thermal management energy consumption of the energy storage system.

[0071] In the energy storage system provided in the present application, the heat exchange medium in liquid state flowing through the first heat exchanger 33 dissipates heat for the energy storage unit 1, and liquid-cools the energy storage unit 1, so as to ensure the heat dissipation effect of the energy storage unit 1, thereby ensuring the safe and stable operation of the energy storage system; the power device 31 absorbs the heat of the electrical equipment 2, realizes the heat dissipation of the electrical equipment 2, so as to ensure the heat dissipation effect of the energy storage unit, thereby ensuring the safe and stable operation of the energy storage system.

[0072] In the energy storage system, the energy storage unit 1 can be cooled by air cooling or liquid cooling. In order to improve the heat dissipation effect of the energy storage unit 1, the energy storage unit 1 can be cooled by liquid cooling. Figure 2As shown, in some embodiments, the energy storage unit 1 includes an energy storage unit body 11 and an energy storage unit liquid cooling device 12, wherein the energy storage unit liquid cooling device 12 is used to absorb the heat of the energy storage unit body 11 through the energy storage unit cooling medium, and the first heat exchanger 33 is used to absorb the heat of the energy storage unit cooling medium through the liquid heat exchange medium to absorb the heat of the energy storage unit 1.

[0073] It should be noted that the cooling medium of the energy storage unit can be water, refrigerant or other cooling medium, which is not limited in the embodiments of the present application.

[0074] In order to facilitate the first heat exchanger 33 to absorb the heat of the cooling medium of the energy storage unit, the first heat exchanger 33 can be selected to include a first heat exchange channel and a second heat exchange channel capable of heat exchange, the first heat exchange channel is used for the heat exchange medium to flow through, and the second heat exchange channel is used for the cooling medium of the energy storage unit to flow through.

[0075] It should be noted that the inlet and outlet of the second heat exchange channel are both connected to the energy storage unit liquid cooling device 12 to form a circulation loop for the circulation of the energy storage unit cooling medium. In the first mode, the power device 31, the condenser 32, and the first heat exchange channel of the first heat exchanger 33 are connected end to end in sequence.

[0076] In order to facilitate the circulation of the energy storage unit cooling medium, the thermal management unit 3 may also include a battery side delivery pump 34, which is used to drive the energy storage unit cooling medium to circulate between the energy storage unit liquid cooling device 12 and the second heat exchange channel of the first heat exchanger 33.

[0077] The battery side delivery pump 34 can be close to the first heat exchanger 33 or the energy storage unit liquid cooling device 12. In order to facilitate the installation of the battery side delivery pump 34, the battery side delivery pump 34 can be selected to be close to the first heat exchanger 33. In this case, the battery side delivery pump 34 is located at the inlet side or outlet side of the second heat exchange channel of the first heat exchanger 33, and the embodiment of the present application does not limit this.

[0078] The type of the battery-side delivery pump 34 is selected according to actual conditions, and the embodiment of the present application does not limit this.

[0079] In the embodiment of the present application, the first heat exchanger 33 can also absorb the heat of the cooling medium of the energy storage unit in other ways. Exemplarily, the first heat exchanger 33 is directly connected to the energy storage unit liquid cooling device 12 by heat conduction.

[0080] In the embodiment of the present application, the energy storage unit 1 can also achieve liquid cooling in other ways. In some embodiments, the first heat exchanger 33 includes a heat exchange channel for a heat exchange medium to flow through, and the heat exchange channel is connected to the cooling channel of the energy storage unit 1 so that the heat exchange medium flows through the energy storage unit 1. Among them, the cooling channel of the energy storage unit 1 can be understood as the cooling channel of the energy storage unit liquid cooling device 12, and can also be understood as the cooling channel of the energy storage unit body 11 (in this case, the energy storage unit 1 does not include the energy storage unit liquid cooling device 12, and the first heat exchanger 33 plays the role of the energy storage unit liquid cooling device 12).

[0081] In other embodiments, Figure 3 As shown, the first heat exchanger 33 is arranged on the energy storage unit 1, and the shell of the first heat exchanger 33 is connected to the energy storage unit 1 by thermal conduction. In this case, the energy storage unit 1 includes the energy storage unit liquid cooling device 12, and the shell of the first heat exchanger 33 is connected to the energy storage unit liquid cooling device 12 by thermal conduction (as described above); the energy storage unit 1 does not include the energy storage unit liquid cooling device 12, and the first heat exchanger 33 plays the role of the energy storage unit liquid cooling device 12.

[0082] When the housing of the first heat exchanger 33 is connected to the energy storage unit 1 by thermal conduction, the first heat exchanger 33 can be attached to the energy storage unit 1. Of course, the first heat exchanger 33 and the energy storage unit 1 can also be connected by other means to achieve thermal conduction connection, which is not limited in the present embodiment.

[0083] like Figure 1-Figure 3 As shown, in the embodiment of the present application, the power device 31 includes an absorber 311 and a second heat exchanger 312; wherein the second heat exchanger 312 and the first heat exchanger 33 are both connected to the absorber 311; the second heat exchanger 312 is used to absorb the heat of the electrical equipment 2 through the absorbent solution, so that the absorbent solution is converted from a dilute solution to a concentrated solution and water vapor, and the water vapor is a gaseous heat exchange medium; the first heat exchanger 33 is used to absorb the heat of the energy storage unit 1 through condensed water and evaporate it into water vapor, and the condensed water is a liquid heat exchange medium; the absorber 311 is used to receive the water vapor provided by the first heat exchanger 33 and the concentrated solution provided by the second heat exchanger 312 to form a dilute solution.

[0084] It should be noted that the absorber 311 has a water vapor inlet, a dilute solution outlet and a concentrated solution inlet, and the second heat exchanger 312 has a water vapor outlet, a concentrated solution outlet and a dilute solution inlet; wherein the water vapor inlet of the absorber 311 is connected to the water vapor outlet of the first heat exchanger 33, the dilute solution outlet of the absorber 311 is connected to the dilute solution inlet of the second heat exchanger 312, the concentrated solution outlet of the second heat exchanger 312 is connected to the concentrated solution inlet of the absorber 311, and the water vapor outlet of the second heat exchanger 312 is connected to the inlet of the condenser 32. Exemplarily, the dilute solution outlet of the absorber 311 is connected to the dilute solution inlet of the second heat exchanger 312 through the first refrigeration connecting pipe 314, and the concentrated solution outlet of the second heat exchanger 312 is connected to the concentrated solution inlet of the absorber 311 through the second refrigeration connecting pipe 315.

[0085] The absorbent solution may be a lithium bromide aqueous solution or a calcium chloride aqueous solution, etc., which is not limited in the embodiments of the present application.

[0086] The specific type of the second heat exchanger 312 is selected according to actual conditions. For example, the second heat exchanger 312 is a spray heat exchanger, which is not limited in this embodiment of the present application.

[0087] In the power device 31 , in order to facilitate the circulation of the absorbent solution, the power device 31 may further include a refrigeration side delivery pump 313 , and the refrigeration side delivery pump 313 is connected in series between the absorber 311 and the second heat exchanger 312 .

[0088] The above-mentioned refrigeration side delivery pump 313 is used to drive the dilute solution to flow from the absorber 311 to the second heat exchanger 312, which can be understood as the refrigeration side delivery pump 313 is used to be connected in series to the first refrigeration connecting pipe 314; or, the refrigeration side delivery pump 313 is used to drive the concentrated solution to flow from the second heat exchanger 312 to the absorber 311, which can be understood as the refrigeration side delivery pump 313 is used to be connected in series to the second refrigeration connecting pipe 315.

[0089] The type of the refrigeration side delivery pump 313 is selected according to actual conditions, and the embodiment of the present application does not limit this.

[0090] like Figure 4 and Figure 5 As shown, in the embodiment of the present application, the power device 31 may further include a second throttling device 316, which is connected in series between the absorber 311 and the second heat exchanger 312, and is used to throttle the dilute solution.

[0091] The second throttling device 316 can be a capillary tube, an electromagnetic expansion valve or a throttling valve, etc., which is not limited in the embodiment of the present application.

[0092] The second throttling device 316 can cool the dilute solution by throttling the dilute solution, thereby increasing the temperature difference between the dilute solution and the electrical device 2, increasing the absorption rate of the heat of the electrical device 2 by the dilute solution, and further improving the heat dissipation efficiency and heat dissipation effect of the electrical device 2. Moreover, the second throttling device 316 can also reduce the pressure of the dilute solution to a specified pressure (the specified pressure is the maximum pressure of the water in the dilute solution from liquid to gas when the temperature of the dilute solution is constant. In other words, when the pressure of the dilute solution is the specified pressure, the dilute solution only needs to absorb a small amount of heat to turn the water into water vapor.), so that the water in the dilute solution (absorbent solution) is more likely to turn into water vapor. It can be seen that the second throttling device 316 can optimize the function of the power device 31 to provide water vapor, thereby optimizing the heat dissipation effect of the energy storage unit 1, and further optimizing the heat dissipation effect of the energy storage system.

[0093] In the embodiment of the present application, after adopting the above-mentioned power device 31, the refrigeration unit 3a can be understood as an absorption refrigeration unit.

[0094] In the energy storage system, the electrical device 2 can be cooled by air cooling or liquid cooling. In order to improve the heat dissipation effect of the electrical device 2, the electrical device 2 can be cooled by liquid cooling. Figure 4-Figure 5 As shown, in some embodiments, the electrical equipment 2 includes an electrical equipment body 21 and an electrical equipment liquid cooling device 22; wherein the electrical equipment liquid cooling device 22 is used to absorb the heat of the electrical equipment body 21 through the electrical equipment cooling medium; the second heat exchanger 312 is used to absorb the heat of the electrical equipment cooling medium through the absorbent solution to absorb the heat of the electrical equipment 2.

[0095] It should be noted that the cooling medium of the electrical equipment may be water, refrigerant or other cooling medium, which is not limited in the embodiments of the present application.

[0096] like Figure 4 As shown, in order to facilitate the second heat exchanger 312 to utilize the heat of the cooling medium of the electrical equipment, the second heat exchanger 312 can be selected to include a first heat exchange channel and a second heat exchange channel capable of heat exchange, the first heat exchange channel is used for the absorbent solution to flow through, and the second heat exchange channel is used for the cooling medium of the electrical equipment to flow through. In order to improve the heat exchange efficiency, the second heat exchange channel can be selected to be located in the first heat exchange channel, and the first heat exchange channel can be understood as a heat exchange cavity.

[0097] It should be noted that the inlet and outlet of the second heat exchange channel of the second heat exchanger 312 are both connected to the electrical equipment liquid cooling device 22 to form a circulation loop for circulating the cooling medium of the electrical equipment.

[0098] In order to facilitate the circulation of the energy storage unit cooling medium, the thermal management unit 3 may further include a delivery pump, which is used to drive the electrical equipment cooling medium to circulate between the electrical equipment liquid cooling device 22 and the second heat exchange channel of the second heat exchanger 312.

[0099] The specific location of the above-mentioned delivery pump is selected according to actual conditions, and the embodiments of the present application do not limit this.

[0100] In the embodiment of the present application, the second heat exchanger 312 can also absorb the heat of the cooling medium of the electrical equipment in other ways. Exemplarily, the second heat exchanger 312 is directly connected to the electrical equipment liquid cooling device 22 by heat conduction.

[0101] In the embodiment of the present application, the electrical device 2 can also achieve liquid cooling in other ways. In some embodiments, the second heat exchanger 312 includes a heat exchange channel for the absorbent solution to flow through, and the heat exchange channel is connected to the cooling channel of the electrical device 2 so that the absorbent solution flows through the electrical device 2. Among them, the cooling channel of the electrical device 2 can be understood as the cooling channel of the electrical device liquid cooling device 22, and can also be understood as the cooling channel of the electrical device body 21 (in this case, the electrical device 2 does not include the electrical device liquid cooling device 22, and the second heat exchanger 312 plays the role of the electrical device liquid cooling device 22).

[0102] In other embodiments, Figure 5 As shown, the second heat exchanger 312 is arranged on the electrical device 2, and the housing of the second heat exchanger 312 is connected to the electrical device 2 by thermal conduction. In this case, the electrical device 2 includes the electrical device liquid cooling device 22, and the housing of the second heat exchanger 312 is connected to the electrical device liquid cooling device 22 by thermal conduction (as described above); the electrical device 2 does not include the electrical device liquid cooling device 22, and the second heat exchanger 312 plays the role of the electrical device liquid cooling device 22.

[0103] When the housing of the second heat exchanger 312 is connected to the electrical device 2 by thermal conduction, the second heat exchanger 312 can be attached to the electrical device 2. Of course, the second heat exchanger 312 and the electrical device 2 can also be connected by other means to achieve thermal conduction connection, which is not limited in the present embodiment.

[0104] like Figure 6-Figure 9 As shown, in some embodiments, the refrigeration unit 3a may further include an evaporator 36, which is arranged in parallel with the first heat exchanger 33, and the evaporator 36 is used to evaporate the liquid heat exchange medium into a gaseous heat exchange medium. The thermal management unit 3 also has a second mode; in the second mode, the power device 31, the condenser 32 and the evaporator 36 are connected end to end in sequence, so that a circulation loop for the circulation of the heat exchange medium is formed.

[0105] In the above embodiment, in the second mode, the heat exchange medium flows through the condenser 32 and then enters the evaporator 36, and no longer enters the first heat exchanger 33, so that the heat exchange medium no longer absorbs the heat of the energy storage unit 1, that is, the heat exchange medium no longer dissipates heat from the energy storage unit 1. This mode is suitable for the case where the energy storage system is in a low-temperature environment (because the energy storage unit 1 is not resistant to low temperatures, the energy storage unit 1 in a low-temperature environment does not need to dissipate heat).

[0106] In order to facilitate the thermal management unit 3 to switch between the first mode and the second mode, the pipeline where the evaporator 36 is located, the pipeline where the first heat exchanger 33 is located, and the pipeline where the condenser 32 is located can be connected through a connecting valve 37; wherein the connecting valve 37 is located upstream of the evaporator 36 and upstream of the first heat exchanger 33; the connecting valve 37 has a first valve position and a second valve position; when the connecting valve 37 is in the first valve position, the connecting valve 37 connects the condenser 32 and the first heat exchanger 33, and the thermal management unit 3 is in the first mode, such as Figure 7 When the connecting valve 37 is in the second valve position, the connecting valve 37 connects the condenser 32 and the evaporator 36, and the thermal management unit 3 is in the second mode, such as Figure 8 In this way, by controlling the valve position of the communication valve 37, the mode of the thermal management unit 3 can be controlled, which is convenient for use.

[0107] The type of the connecting valve 37 is selected according to actual conditions. For example, the connecting valve 37 is a two-position three-way valve.

[0108] In the embodiment of the present application, two two-way valves can also be used to replace the above-mentioned connecting valve 37, one two-way valve is connected in series to the branch where the first heat exchanger 33 is located, and the other two-way valve is connected in series to the branch where the evaporator 36 is located, which is not limited to the above embodiment.

[0109] In actual situations, if the temperature of the environment in which the energy storage system is located is lower than the temperature that the energy storage unit 1 can adapt to, the energy storage unit 1 needs to be heated. In some embodiments, the thermal management unit 3 further includes a heating device 38; when the thermal management unit 3 is in the second mode, the heating device 38 is used to heat the energy storage unit 1. It should be noted that when the thermal management unit 3 is in the first mode, the heating device 38 is not started, and the heating device 38 does not heat the energy storage unit 1.

[0110] The type of the heating device 38 is selected according to actual conditions. For example, the heating device 38 is an electric heater or other heater, which is not limited in the embodiment of the present application.

[0111] like Figure 6-Figure 8As shown, in order to facilitate the heating device 38 to heat the energy storage unit 1, the energy storage unit 1 can be selected to dissipate heat through the energy storage unit cooling medium flowing through it; the first heat exchanger 33 is used to absorb the heat of the energy storage unit cooling medium through the liquid heat exchange medium to absorb the heat of the energy storage unit 1; the heating device 38 is used to heat the energy storage unit cooling medium to heat the energy storage unit 1; wherein the energy storage unit 1, the heating device 38 and the first heat exchanger 33 are connected end to end in sequence. In this case, the energy storage unit 1 may include the energy storage unit body 11 and the energy storage unit liquid cooling device 12 described above, or the energy storage unit 1 includes the energy storage unit body 11 but does not include the energy storage unit liquid cooling device 12.

[0112] Exemplarily, as described above, the first heat exchanger 33 includes a first heat exchange channel and a second heat exchange channel, based on which the energy storage unit 1, the heating device 38 and the second heat exchange channel of the first heat exchanger 33 are connected end to end in sequence. In this way, a circulation loop is formed for circulating the cooling medium of the energy storage unit.

[0113] In the above energy storage system, the battery side delivery pump 34 can be selected to be connected in series between the heating device 38 and the first heat exchanger 33, or the heating device 38 can be selected to be connected in series between the battery side delivery pump 34 and the first heat exchanger 33. Of course, the relative position relationship between the battery side delivery pump 34, the heating device 38 and the first heat exchanger 33 can be selected to be other, and the embodiment of the present application is not limited to this.

[0114] In the above energy storage system, the heating device 38 makes full use of the original structure of the thermal management unit 3 in the first mode; moreover, the circulation of the cooling medium of the energy storage unit only requires the provision of a battery-side delivery pump 34. In this way, the structure of the energy storage system is effectively simplified and the cost of the energy storage system is reduced; moreover, the entire energy storage system may only have two delivery pumps (battery-side delivery pump 34 and refrigeration-side delivery pump 313) that need to consume electrical energy, which can greatly improve the energy efficiency ratio of the energy storage system, reduce the auxiliary power supply energy consumption, and improve the energy utilization rate of the energy storage system.

[0115] In actual situations, the heating device 38 may not be connected in series with the first heat exchanger 33. It can be understood that the heating device 38 and the first heat exchanger 33 are connected in parallel. In this way, a battery-side delivery pump 34 and a valve are added to the branch where the heating device 38 is located to ensure that the cooling medium of the energy storage unit flows through the first heat exchanger 33 in the first mode and flows through the heating device 38 in the second mode.

[0116] like Fig. 9 As shown, in order to facilitate the heating device 38 to heat the energy storage unit 1, the heating device 38 can also be arranged on the energy storage unit 1, and the heating device 38 and the energy storage unit 1 are thermally connected. Exemplarily, the heating device 38 is attached to the energy storage unit 1.

[0117] It should be noted that, when the energy storage unit 1 includes the energy storage unit liquid cooling device 12 , the heating device 38 and the energy storage unit liquid cooling device 12 are connected by thermal conduction.

[0118] According to the following Figure 6-Figure 8 The energy storage system shown is used to illustrate the working process of the energy storage system.

[0119] On the refrigeration side, the refrigeration side delivery pump 313 pumps the low-temperature dilute solution (absorbent dilute solution) into the second heat exchanger 312; the low-temperature dilute solution exchanges heat with the relatively high-temperature electrical equipment 2, thereby cooling the electrical equipment 2, and at the same time, the water in the dilute solution is heated and evaporated into water vapor; after evaporation, the dilute solution forms a concentrated solution (absorbent concentrated solution), and the concentrated solution returns to the absorber 311 from the second heat exchanger 312; the water vapor formed in the second heat exchanger 312 enters the condenser 32 and condenses into high-temperature liquid water, and the high-temperature liquid water passes through the second throttling device 316 to become low-temperature and low-pressure water, and is controlled by the connecting valve 37 to enter the evaporator 36 or the first heat exchanger 33 to absorb heat and evaporate to become high-temperature water vapor, and then enter the absorber 311; the high-temperature water vapor mixes with the concentrated solution to regenerate a dilute solution, completing the circulation of the absorbent solution; on the battery side (energy storage unit side), the battery side delivery pump 34 drives the cooling medium to control the temperature of the energy storage unit 1 (cooling the energy storage unit 1 in the first mode and heating the energy storage unit 1 in the second mode).

[0120] like Figure 7 As shown, in the first mode, the refrigeration side delivery pump 313 is turned on, and the water vapor generated by the dilute solution being heated by the electrical equipment 2 is converted into low-temperature water through the condenser 32 and the first throttling device 35, and then enters the first heat exchanger 33 through the connecting valve 37, and exchanges heat with the high-temperature cooling medium of the energy storage unit 1 (energy storage unit cooling medium). The low-temperature water cools the high-temperature cooling medium into a low-temperature cooling medium (energy storage unit cooling medium), and the low-temperature cooling medium then enters the energy storage unit 1 (the cooling battery compartment of the energy storage unit 1), and is driven by the battery side delivery pump 34 to complete the circulation cooling of the energy storage unit 1.

[0121] like Figure 8 As shown, in the second mode, the refrigeration side delivery pump 313 is turned on, and the water vapor generated by the dilute solution being heated by the electrical equipment 2 is converted into low-temperature water through the condenser 32 and the first throttling device 35, and then enters the evaporator 36 for cooling through the connecting valve 37, completing an independent cycle; on the battery side, the battery side delivery pump 34 is turned on, and the battery side delivery pump 34 drives the cooling medium of the energy storage unit to circulate, and turns on the heating device 38, so that the heating device 38 heats the cooling medium of the energy storage unit, thereby heating the energy storage unit 1.

[0122] In actual situations, the structure of the energy storage system is adjusted to adaptively adjust the working process of the energy storage system, which is not limited to the above-mentioned working process.

[0123] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy storage system, characterized in that: include: Energy storage units, electrical equipment, and thermal management units; Wherein, the thermal management unit includes a refrigeration unit, and the refrigeration unit includes: a power device, a condenser and a first heat exchanger; the power device is used to provide a gaseous heat exchange medium by absorbing the heat of the electrical equipment to drive the refrigeration unit to work; the condenser is used to condense the gaseous heat exchange medium into a liquid state; the first heat exchanger is used to absorb the heat of the energy storage unit through the liquid heat exchange medium; The thermal management unit has a first mode; in the first mode, the power device, the condenser and the first heat exchanger are connected end to end in sequence.

2. The energy storage system according to claim 1, characterized in that: The electrical equipment includes an energy storage converter, and the power device is used to provide the gaseous heat exchange medium by absorbing the heat of the energy storage converter; And / or, the electrical equipment includes a switch box, and the power device is used to provide the gaseous heat exchange medium by absorbing heat from the switch box.

3. The energy storage system according to claim 1, characterized in that: The energy storage unit includes: an energy storage unit body and an energy storage unit liquid cooling device; wherein the energy storage unit liquid cooling device is used to absorb the heat of the energy storage unit body through the energy storage unit cooling medium, and the first heat exchanger is used to absorb the heat of the energy storage unit cooling medium through the liquid heat exchange medium.

4. The energy storage system according to claim 3, characterized in that: The first heat exchanger comprises a first heat exchange channel and a second heat exchange channel capable of performing heat exchange, the first heat exchange channel is used for the heat exchange medium to flow through, and the second heat exchange channel is used for the energy storage unit cooling medium to flow through; The thermal management unit further includes a battery-side delivery pump, which is used to drive the energy storage unit cooling medium to circulate between the second heat exchange channel and the energy storage unit liquid cooling device.

5. The energy storage system according to claim 1, characterized in that: The first heat exchanger comprises a heat exchange channel for the heat exchange medium to flow through, and the heat exchange channel is connected to the cooling channel of the energy storage unit so that the heat exchange medium flows through the energy storage unit; Alternatively, the first heat exchanger is disposed on the energy storage unit, and a housing of the first heat exchanger is thermally connected to the energy storage unit.

6. The energy storage system according to claim 1, characterized in that: The refrigeration unit further includes a first throttling device, which is connected in series between the condenser and the first heat exchanger.

7. The energy storage system according to claim 1, characterized in that: The power plant includes an absorber and a second heat exchanger; Wherein, the second heat exchanger and the first heat exchanger are both in communication with the absorber; The second heat exchanger is used to absorb the heat of the electrical equipment through an absorbent solution, so that the absorbent solution is converted from a dilute solution to a concentrated solution and water vapor, and the water vapor is the gaseous heat exchange medium; the first heat exchanger is used to absorb the heat of the energy storage unit through condensed water and evaporate it into water vapor, and the condensed water is the liquid heat exchange medium; The absorber is used for receiving the water vapor provided by the first heat exchanger and the concentrated solution provided by the second heat exchanger to form the dilute solution.

8. The energy storage system according to claim 7, characterized in that: The electrical equipment includes an electrical equipment body and an electrical equipment liquid cooling device, wherein the electrical equipment liquid cooling device is used to absorb the heat of the electrical equipment body through an electrical equipment cooling medium, and the second heat exchanger is used to absorb the heat of the electrical equipment cooling medium through the absorbent solution.

9. The energy storage system according to claim 8, characterized in that: The second heat exchanger includes a first heat exchange channel and a second heat exchange channel capable of performing heat exchange, the first heat exchange channel is used for the absorbent solution to flow through, and the second heat exchange channel is used for the electrical equipment cooling medium to flow through.

10. The energy storage system according to claim 7, characterized in that: The second heat exchanger comprises a heat exchange channel for the absorbent solution to flow through, the heat exchange channel being in communication with a cooling channel of the electrical device so that the absorbent solution flows through the electrical device; Alternatively, the second heat exchanger is disposed on the electrical device, and a housing of the second heat exchanger is thermally connected to the electrical device.

11. The energy storage system according to claim 7, characterized in that: The power device also includes: A refrigeration side delivery pump, the refrigeration side delivery pump is connected in series between the absorber and the second heat exchanger, and the refrigeration side delivery pump is used to drive the dilute solution to flow from the absorber to the second heat exchanger, or to drive the concentrated solution to flow from the second heat exchanger to the absorber; And / or, a second throttling device, wherein the second throttling device is connected in series between the absorber and the second heat exchanger, and the second throttling device is used to throttle the dilute solution.

12. The energy storage system according to any one of claims 1 to 11, characterized in that: The refrigeration unit further comprises an evaporator, the evaporator and the first heat exchanger are arranged in parallel, and the evaporator is used to evaporate the liquid heat exchange medium into the gaseous heat exchange medium; The thermal management unit also has a second mode; in the second mode, the power device, the condenser and the evaporator are connected end to end in sequence.

13. The energy storage system according to claim 12, characterized in that: The pipeline where the evaporator is located, the pipeline where the first heat exchanger is located, and the pipeline where the condenser is located are connected through a connecting valve; Wherein, the communication valve is located upstream of the evaporator and upstream of the first heat exchanger; The connecting valve has a first valve position and a second valve position; when the connecting valve is in the first valve position, the connecting valve connects the condenser and the first heat exchanger, and the thermal management unit is in the first mode; when the connecting valve is in the second valve position, the connecting valve connects the condenser and the evaporator, and the thermal management unit is in the second mode.

14. The energy storage system according to claim 12, characterized in that: The thermal management unit further includes a heating device; when the thermal management unit is in the second mode, the heating device is used to heat the energy storage unit.

15. The energy storage system according to claim 14, characterized in that: The heating device is arranged on the energy storage unit, and the heating device and the energy storage unit are connected by thermal conduction; Alternatively, the heating device is used to heat the cooling medium of the energy storage unit to heat the energy storage unit; wherein the energy storage unit, the heating device and the first heat exchanger are connected end to end in sequence.

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