Energy storage device

Abstract

The invention discloses an energy storage device. The energy storage device comprises a control box provided with an inverter, a battery box provided with a battery module and a cooling assembly. A first connecting part is arranged on the bottom surface of the control box, a second connecting part in pluggable connection with the first connecting part is arranged on the top surface of the battery box, a first connecting part is arranged on the bottom surface of the battery box, and the control box and the battery box are connected and stacked through the first connecting part and the second connecting part respectively; and the inverter is electrically connected with the battery module through the conductive terminal. The cooling assembly comprises a first water cooling plate connected with the inverter, a second water cooling plate connected with the battery module and a pipeline. The pipeline penetrates through the first connecting part and the second connecting part and is connected with the first water cooling plate and the second water cooling plate. Thus, the temperature of the inverter and the temperature of the battery module can be independently controlled, temperature control is facilitated, the structure of the energy storage equipment is compact, and the temperature of the first connecting part and the temperature of the second connecting part can be reduced.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage device. Background Art

[0002] In the related art, in order to facilitate users' electricity use, users can arrange energy storage equipment on the balcony or at home. The energy storage equipment mainly includes an inverter and a battery module. In order to ensure that the energy storage equipment can work at an appropriate temperature, the related art often uses a fan to perform thermal management on the battery module and inverter in the energy storage equipment to control the temperature inside the energy storage equipment. However, the fan's heat dissipation capacity is limited and may not meet the heat dissipation requirements of the energy storage equipment. Summary of the invention

[0003] In view of this, the present invention aims to solve one of the problems in the related art at least to a certain extent. To this end, the purpose of the present application is to provide an energy storage device.

[0004] The present application provides an energy storage device. The energy storage device includes a control box, at least one battery box and a cooling assembly. An inverter is provided in the control box. A battery module is provided in the battery box. A first connecting portion is provided on the bottom surface of the control box, a second connecting portion is provided on the top surface of each of the at least one battery box, and the first connecting portion is provided on the bottom surface of each of the at least one battery box. The first connecting portion and the second connecting portion are pluggable and connected, and the first connecting portion and the second connecting portion are both provided with conductive terminals. After the control box and each of the at least one battery box are connected and stacked through their respective first connecting portions and second connecting portions, the inverter in the control box and the battery modules in each of the at least one battery box are electrically connected through the conductive terminals. The cooling assembly includes a first water-cooled plate, a second water-cooled plate and a pipeline. The first water-cooling plate is fixed to the heat dissipation surface of the inverter in the control box, and the second water-cooling plate is fixed to the heat dissipation surface of the battery module in each of the at least one battery box. After the control box and the at least one battery box are stacked and fixed, the pipeline is passed through the first connecting part and the second connecting part between the control box and the at least one battery box, and is connected to the first water-cooling plate and the second water-cooling plate.

[0005] In some embodiments, the first connecting portion is concave and the second connecting portion is convex.

[0006] In some embodiments, the pipeline includes a first main pipeline, a second main pipeline, an inverter branch pipeline and a battery branch pipeline. The first main pipeline and the second main pipeline are arranged through the first connecting portion and the second connecting portion. The inverter branch pipeline connects the first main pipeline, the first water-cooling plate and the second main pipeline, and the inverter branch pipeline is located in the control box. The battery branch pipeline connects the first main pipeline, the second water-cooling plate and the second main pipeline, and the battery branch pipeline is located in the battery box.

[0007] In some embodiments, the first connection portion and the second connection portion are both provided with a first connection port and a second connection port. The first main line is provided through the first connection port, the second main line is provided through the second connection port, and the first main line and the second main line are both parallel to the side wall of the control box.

[0008] In some embodiments, the control box is provided with an isolation plate. The isolation plate is configured to separate the control box into a first sub-chamber and a second sub-chamber. The cooling assembly further includes a radiator. The pipeline further includes a heat dissipation pipeline. The heat dissipation pipeline connects the first main pipeline, the radiator and the second main pipeline. The inverter is disposed in the first sub-chamber. The radiator is disposed in the second sub-chamber. The first water-cooling plate and the second water-cooling plate are both connected to the radiator.

[0009] In some embodiments, the control box is provided with an air inlet and an air outlet which are connected to and arranged opposite to the second sub-chamber. The radiator is arranged between the air inlet and the air outlet. A first cooling fan is arranged on the radiator. The first cooling fan is used to form an airflow from the air inlet to the air outlet.

[0010] In some embodiments, the cooling assembly further includes a circulating water pump. The circulating water pump is disposed on the pipeline. The circulating water pump is used to drive the cooling medium in the pipeline to circulate between the first water-cooled plate and the radiator, and / or between the second water-cooled plate and the radiator.

[0011] In some embodiments, a control valve is provided on the pipeline, and the control valve is used to control the flow rate of the cooling medium passing through the first water-cooled plate.

[0012] In some embodiments, the cooling assembly further comprises a heater, which is connected to the pipeline and is used to heat the cooling medium in the pipeline.

[0013] In some embodiments, the first water-cooling plate is arranged vertically. The first water-cooling plate is provided with a heat dissipation fin. The heat dissipation fin is arranged on a side of the first water-cooling plate away from the inverter and on a side of the control box. The heat dissipation fin is located outside the control box. The cooling assembly further includes a second heat dissipation fan. The second heat dissipation fan is arranged on the first water-cooling plate and on a side of the heat dissipation fin. The second heat dissipation fan is used to generate wind to dissipate heat from the heat dissipation fin.

[0014] In some embodiments, the cooling assembly includes a radiator, a first cooling fan, a second cooling fan, a control valve, and a circulating water pump. The radiator, the control valve, and the circulating water pump are all arranged on the pipeline. The first cooling fan is arranged on the radiator. The second cooling fan is arranged on the first water-cooled plate. The first water-cooled plate and the second water-cooled plate are connected in parallel. The circulating water pump is arranged between the radiator and the first water-cooled plate. The first cooling fan is used to dissipate heat for the second water-cooled plate. The second cooling fan is used to dissipate heat for the first water-cooled plate.

[0015] In some embodiments, the inverter includes an inverter unit, the inverter unit includes a control board, and a first controller is arranged on the control board. The first controller is used to control the control valve and the second cooling fan to remain closed when the temperature of the inverter is less than the first inversion temperature threshold and the temperature of the battery module is within a preset temperature range; and / or, the first controller is used to control the second cooling fan to turn on and control the control valve to remain closed when the temperature of the inverter is greater than or equal to the first inversion temperature threshold and less than the second inversion temperature threshold and the temperature of the battery module is within the preset temperature range, and the second inversion temperature threshold is greater than the first inversion temperature threshold; and / or, the first controller is used to control the inverter to enter a standby state, and control the second cooling fan to turn on and the control valve to remain closed when the temperature of the inverter is greater than or equal to the second inversion temperature threshold and the temperature of the battery module is within the preset temperature range.

[0016] In some embodiments, a second controller is provided on the battery module, and the second controller is used to control the circulating water pump and the first cooling fan to operate at maximum power, and control the radiator to open and the control valve to close when the temperature of the battery module is greater than or equal to the first battery temperature threshold and less than the second battery temperature threshold, and the second battery temperature threshold is greater than the first battery temperature threshold; and / or, the second controller is used to control the battery module to standby state, and control the circulating water pump and the first cooling fan to operate at maximum power, the radiator to open and the control valve to close when the temperature of the battery module is greater than or equal to the second battery temperature threshold.

[0017] In certain embodiments, the cooling assembly further includes a heater, and the second controller is used to control the radiator, the second cooling fan and the first cooling fan to remain closed, and control the control valve, the circulating water pump and the heater to turn on when the temperature of the battery module is less than a third battery temperature threshold and the battery module is in a charging state, and the third battery temperature threshold is less than the first battery temperature threshold; and / or, the second controller is used to control the radiator, the first cooling fan and the second cooling fan to be closed, and control the circulating water pump and the control valve to be opened when the temperature of the battery module is greater than or equal to the third battery temperature threshold and less than the first battery temperature threshold, the battery module is in a charging state and the inverter is in a working state.

[0018] The energy storage device of the embodiment of the present application is provided with an inverter in a control box, a battery module in a battery box, a first connection part on the bottom surface of the control box, a second connection part that can be plugged and unplugged with the first connection part on the top surface of each battery box in at least one battery box, and a first connection part on the bottom surface of each battery box in at least one battery box, and a first water-cooling plate is connected to the inverter, and a second water-cooling plate is connected to the battery module, so that the control box and each battery box in at least one battery box are connected and stacked through their respective first connection parts and second connection parts, and the inverter and the battery module can be electrically connected through the conductive terminals of the first connection part and the second connection part. Compared with the heat dissipation capacity of the inverter and the battery module by using a fan, the heat dissipation capacity is stronger, and the temperature of the inverter and the battery module can be independently controlled, which is more conducive to the temperature control of the energy storage device. In addition, the embodiment of the present application is provided with a pipeline through the first connection part and the second connection part and connected to the first water-cooling plate and the second water-cooling plate, so that the structure of the energy storage device can be more compact and the temperature of the first connection part and the second connection part can be reduced.

[0019] 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

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 is a schematic diagram of the three-dimensional structure of an energy storage device in some embodiments of the present application;

[0022] Figure 2 is a schematic diagram of a side view structure of an energy storage device according to certain embodiments of the present application with part of the side wall removed;

[0023] Figure 3 is a schematic structural diagram of a first connecting portion and a second connecting portion of certain embodiments of the present application;

[0024] Figure 4 is a schematic diagram of an axial structure of an energy storage device according to certain embodiments of the present application with part of the side wall removed;

[0025] Figure 5 is a schematic diagram of the axial structure of the energy storage device of certain embodiments of the present application without part of the side wall and the isolation plate;

[0026] Figure 6 is a topological schematic diagram of a cooling assembly according to certain embodiments of the present application;

[0027] Figure 7 It is a schematic structural diagram of the first water cooling plate of certain embodiments of the present application.

[0028] Component reference numbers:

[0029] Energy storage device 100;

[0030] Control box 10, side wall 11, isolation plate 12, first sub-chamber 13, second sub-chamber 14, air inlet 15, air outlet 16; battery box 20; inverter 30, inverter unit 31, control board 311, first controller 313, power board 315, first temperature collecting component 317; battery module 40, battery protection board 41, second controller 43, second temperature collecting component 45; first connecting portion 51, second connecting portion 52, first connecting port 53, conductive terminal 54, second connecting port 55, signal terminal 57;

[0031] Cooling assembly 60; first water-cooled plate 61, heat dissipation fins 611, flow channel 613, water inlet 615, water outlet 617; second water-cooled plate 62; pipeline 63, first main pipeline 631, second main pipeline 633, inverter branch pipeline 635, battery branch pipeline 637, heat dissipation pipeline 639; radiator 64, first cooling fan 641, circulating water pump 65, control valve 66, heater 67, second cooling fan 68. DETAILED DESCRIPTION

[0032] 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.

[0033] In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, and may refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection, or mutual communication; direct connection, indirect connection through an intermediate medium, internal connection between two elements, or interaction between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0036] 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.

[0037] Please combine Figure 1 , Figure 2 and Figure 3The present application provides an energy storage device 100. The energy storage device 100 includes a control box 10, at least one battery box 20 and a cooling assembly 60. A battery module 40 is arranged in the battery box 20. A first connecting portion 51 is arranged on the bottom surface of the control box 10, and a second connecting portion 52 is arranged on the top surface of each battery box 20 in the at least one battery box 20. A first connecting portion 51 is arranged on the bottom surface of each battery box 20 in the at least one battery box 20. The first connecting portion 51 and the second connecting portion 52 are pluggable. The first connecting portion 51 and the second connecting portion 52 are both provided with a conductive terminal 54. After the control box 10 and each battery box 200 in the at least one battery box 20 are connected and stacked through their respective first connecting portions 51 and second connecting portions 52, the inverter 30 in the control box 10 and the battery module 40 in each battery box 20 in the at least one battery box 20 are electrically connected through the conductive terminal 54. The cooling assembly 60 includes a first water-cooled plate 61, a second water-cooled plate 62 and a pipeline 63. A first water-cooling plate 61 is fixed to the heat dissipation surface of the inverter 30 in the control box 10. A second water-cooling plate 62 is fixed to the heat dissipation surface of the battery module 40 in each battery box 20 of at least one battery box 20. After the control box 10 and at least one battery box 20 are stacked and fixed, the pipeline 63 passes through the first connecting portion 51 and the second connecting portion 52 between the control box 10 and at least one battery box 20, and communicates with the first water-cooling plate 61 and the second water-cooling plate 62.

[0038] Specifically, the first connection portion 51 can be respectively arranged on the bottom surface of the control box 10 and the bottom surface of each battery box 20 in at least one battery box 20 by welding, screwing or snapping. The second connection portion 52 can be arranged on the bottom surface of the control box 10 and the top surface of each battery box 20 in at least one battery box 20 by welding, screwing or snapping. The first connection portion 51 and the second connection portion 52 are pluggable. The first connection portion 51 and the second connection portion 52 are both provided with conductive terminals 54. After the control box 10 and each battery box 200 in at least one battery box 20 are connected and stacked through their respective first connection portions 51 and second connection portions 52, the inverter 30 in the control box 10 and the battery modules 40 in each battery box 20 in at least one battery box 20 are electrically connected through the conductive terminals 54. That is, when there are multiple battery boxes 20, the first battery box 20 can be stacked by plugging the second connection part 52 set on the top surface with the first connection part 51 set on the bottom surface of the control box 10, and the remaining battery boxes 20 can be plugged in turn with the second connection part 51 set on the bottom surface of the previous battery box 20 through the second connection part 52 on the top surface, so that the control box 10 and each battery box 200 in at least one battery box 20 are connected and stacked through their respective first connection parts 51 and second connection parts 52. At this time, the inverter 30 in the control box 10 and the battery modules 40 in each battery box 20 in at least one battery box 20 are electrically connected through the conductive terminals 54 to improve the storage capacity of the energy storage device 100. It should be noted that the control box 10 and the battery box 20 can be made of metals such as aluminum alloys, so as to reduce the weight of the control box 10 and the battery box 20 and extend the service life of the control box 10 and the battery box 20.

[0039] The inverter 30 can be arranged in the control box 10 by screwing or snapping, so as to facilitate the installation and removal of the inverter 30. The battery module 40 can be arranged in the battery box 20 by screwing or snapping, so as to facilitate the installation and removal of the battery module 40.

[0040] The cooling assembly 60 may include a first water-cooled plate 61, a second water-cooled plate 62 and a pipeline 63. The first water-cooled plate 61 may be fixedly arranged on the heat dissipation surface of the inverter 30 in the control box 10 by means of snap-fitting or screwing. The second water-cooled plate 62 may be arranged on the heat dissipation surface of the battery module 40 in each battery box 20 in at least one battery box 20 by means of snap-fitting or screwing. After the control box 10 and at least one battery box 20 are stacked and fixed, the pipeline 63 is passed through the first connecting portion 51 and the second connecting portion 52 between the control box 10 and at least one battery box 20, and communicates with the first water-cooled plate 61 and the second water-cooled plate 62. A cooling medium may flow in the first water-cooled plate 61, the second water-cooled plate 62 and the pipeline 63. It should be noted that the cooling medium may be water or other medium having a cooling effect, which is not limited here.

[0041] In one embodiment, when the inverter 30 is in operation and the temperature of the inverter 30 is high, the cooling medium in the first water-cooling plate 61 can be used to dissipate heat from the inverter 30, so that the inverter 30 operates at a more suitable temperature to prevent the inverter 30 from being damaged due to excessive temperature. It should be noted that the inverter 30 operating at a more suitable temperature may refer to the inverter 30 operating at any temperature in the range of 85°C to 125°C, which is not limited here.

[0042] In another embodiment, when the battery module 40 is in working state and the temperature of the battery module 40 is high, the cooling medium can flow between the pipeline 63 and the second water-cooling plate 62 to dissipate heat for the battery module 40, so that the battery module 40 works at a more suitable temperature, preventing the battery module 40 from being damaged due to excessive temperature, and cooling the first connection part 51 and the second connection part 52. It should be noted that the battery module 40 working at a more suitable temperature can refer to the battery module 40 working at any temperature in the range of 10°C to 35°C, which is not limited here.

[0043] In another embodiment, when the battery module 40 is in a charging state and the temperature of the battery module 40 is low, the cooling medium can exchange heat with the inverter 30 in the first water cooling plate 61, and then the cooling medium after heat exchange can be transferred through the pipeline 63 to the second water cooling plate 62 to heat the battery module 40, thereby effectively utilizing the heat generated by the inverter 30 to heat the battery module 40, so that the temperature of the battery module 40 rises to a more suitable temperature.

[0044] In this way, the energy storage device 100 of the embodiment of the present application is provided by arranging the inverter 30 in the control box 10, the battery module 40 in the battery box 20, and the first connecting portion 51 is provided on the bottom surface of the control box 10, the top surface of each battery box 20 in at least one battery box 20 is provided with a second connecting portion 52 that can be plugged into and unplugged from the first connecting portion 51, and the bottom surface of each battery box 20 in at least one battery box 20 is provided with a first connecting portion 51, and the first water-cooling plate 61 is connected to the inverter 30, and the second water-cooling plate 62 is connected to the battery module 40, so that the control box 101 and each battery box 20 in at least one battery box 20 are connected through their respective first connecting portions 51 and second connecting portions. After the parts 52 are connected and stacked, the inverter 30 and the battery module 40 can be electrically connected through the conductive terminals 54 of the first connection part 51 and the second connection part 52. Compared with using a fan to dissipate heat for the inverter 30 and the battery module 40, the heat dissipation capacity is stronger and the temperature of the inverter 30 and the battery module 40 can be independently controlled, which is more conducive to the temperature control of the energy storage device 100. In addition, the embodiment of the present application makes the structure of the energy storage device 100 more compact and can also reduce the temperature of the first connection part 51 and the second connection part 52 by passing the pipeline 63 through the first connection part 51 and the second connection part 52 and connecting them to the first water-cooled plate 61 and the second water-cooled plate 62.

[0045] See also Figure 3 In some embodiments, the first connection portion 51 is concave and the second connection portion 52 is convex. That is, in the embodiment of the present application, by setting the first connection portion 51 to be concave and the second connection portion 52 to be convex, it is convenient for the control box 10 and each battery box 20 in the at least one battery box 20 to be connected and stacked through their respective first connection portions 51 and second connection portions 52, and for the inverter 30 in the control box 10 and the battery modules 40 in each battery box 20 in the at least one battery box 20 to be electrically connected through the conductive terminals 54 set on the first connection portion 51 and the second connection portion 52.

[0046] See also Figure 2 In some embodiments, the pipeline 63 includes a first main pipeline 631, a second main pipeline 633, an inverter branch pipeline 635, and a battery branch pipeline 637. The first main pipeline 631 and the second main pipeline 633 are arranged in the first connection part 51 and the second connection part 52. The inverter branch pipeline 635 connects the first main pipeline 631, the first water-cooling plate 61, and the second main pipeline 633. The inverter branch pipeline 635 is located in the control box 10. The battery branch pipeline 637 connects the first main pipeline 631, the second water-cooling plate 62, and the second main pipeline 633. The battery branch pipeline 637 is located in the battery box 20.

[0047] Specifically, the first main line 631 and the second main line 633 can be passed through the first connection portion 51 and the second connection portion 52. The number of inverter branch lines 635 can be two, and one end of the two inverter branch lines 635 can be connected to the first water-cooled plate 61 respectively by means of threaded connection or snap-fitting, wherein the other end of one inverter branch line 635 can be connected to the first main line 631 located in the control box 10 by means of threaded connection or snap-fitting, and the other end of the other inverter branch line 635 can be connected to the second main line 633 located in the control box 10 by means of threaded connection or snap-fitting, so that the inverter branch line 635 connects the first main line 631, the first water-cooled plate 61 and the second main line 633, and the number of battery branch lines 637 can be two, and one end of the two battery branch lines 637 can be connected to the second water-cooled plate 62 respectively by means of threaded connection or snap-fitting, wherein the other end of one battery branch line 637 can be connected to the second water-cooled plate 62 respectively by means of threaded connection or snap-fitting, One end can be connected to the first main line 631 located in the battery box 20 by means of a threaded connection or a snap-fitting manner, and the other end of the other battery branch line 637 can be connected to the second main line 633 located in the battery box 20 by means of a threaded connection or a snap-fitting manner, so that the battery branch line 637 connects the first main line 631, the second water-cooling plate 62 and the second main line 633, so that when the temperature of the battery module 40 is high, the battery module 40 is cooled through the first main line 631, the second water-cooling plate 62 and the second main line 633, and when the battery module 40 is in a charging state and the temperature of the battery module 40 is low, the heat generated by the inverter 30 is effectively utilized to heat the battery module 40 through the first main line 631, the second main line 633, the inverter branch line 635 and the battery branch line 637.

[0048] In one embodiment, Figure 4 As shown, when the battery module 40 is in a charging state and the temperature of the battery module 40 is low, the cooling medium can exchange heat with the inverter 30 in the first water-cooled plate 61, flow into the first main line 631 through the inverter branch line 635, and then flow into the battery branch line 637 through the first main line 631 to enter the second water-cooled plate 62 to heat the battery module 40, thereby effectively utilizing the heat generated by the inverter 30 to heat the battery module 40, so that the temperature of the battery module 40 rises to a more suitable temperature. Then, the cooling medium after heating the battery module 40 can flow from another battery branch pipeline 637 into the second main pipeline 633, flow into another inverter branch pipeline 635 through the second main pipeline 633, and flow into the first water cooling plate 61 through another inverter branch pipeline 635 to exchange heat with the inverter 30. This cycle is repeated to heat the battery module 40, and then the heat generated by the inverter 30 is effectively used to heat the battery module 40, so that the temperature of the battery module 40 rises to a more suitable temperature.

[0049] In another embodiment, Figure 5 As shown, when the battery module 40 is in working state and the temperature of the battery module 40 is high, the cooling medium can dissipate heat with the battery module 40 in the second water-cooling plate 62, flow into the first main line 631 through the battery branch line 637, and then flow from the first main line 631 into the second main line 633, and then flow from the second main line 633 into another battery branch line 637 and enter the second water-cooling plate 62 to exchange heat with the battery module 40. This cycle is repeated to dissipate heat for the battery module 40, so that the battery module 40 can operate at a more suitable temperature, thereby preventing the battery module 40 from being damaged due to excessive temperature, and at the same time, the first connection part 51 and the second connection part 52 can be cooled.

[0050] In addition, when there are multiple battery boxes 20, the first main circuit 631 and the second main circuit 633 can be sequentially arranged through the first connecting portion 51 and the second connecting portion 52 of each battery box 20 and each battery box 20, and connected to the second water cooling plate 62 through the battery branch pipe 637 in each battery box 20, thereby ensuring that the flow through each second water cooling plate 62 is uniform while the temperature of the inlet entering each second water cooling plate 62 is consistent, which can reduce the temperature difference of the battery cells of each battery module 40 and improve the battery cell performance.

[0051] Please combine Figure 2 and Figure 3 In some embodiments, the first connection portion 51 and the second connection portion 52 are both provided with a first connection port 53 and a second connection port 55. The first main passage 631 is provided through the first connection port 53. The second main passage 633 is provided through the second connection port 55. The first main passage 631 and the second main passage 633 are both parallel to the side wall 11 of the control box 10. That is, the first connection portion 51 and the second connection portion 52 may be both provided with a first connection port 53 and a second connection port 55 arranged at intervals. The first main passage 631 may be provided through the first connection port 53, and the second main passage 633 may be provided through the second connection port 55, so that the first main passage 631 and the second main passage 633 are provided in the control box 10 and the battery box 20 through the connector 50. The first main passage 631 and the second main passage 633 may both be parallel to the side wall 11 of the control box 10, so that the cooling medium flows more smoothly in the first main passage 631 and the second main passage 633.

[0052] It should be noted that a signal terminal 57 may also be provided on the first connection portion 51 and the second connection portion 52 , and a signal connection may be established between the inverter 30 and the battery module 40 via the signal terminal 57 , so that the inverter 30 and the battery module 40 can communicate via the signal terminal 57 .

[0053] Please combine Figure 2 and Figure 6 In some embodiments, the control box 10 is provided with an isolation plate 12. The isolation plate 12 is configured to separate the control box 10 into a first sub-chamber 13 and a second sub-chamber 14. The cooling assembly 60 further includes a radiator 64. The pipeline 63 further includes a heat dissipation pipeline 639, which connects the first main pipeline 631, the radiator 64, and the second main pipeline 633. The inverter 30 is disposed in the first sub-chamber 13. The radiator 64 is disposed in the second sub-chamber 14. The first water-cooling plate 61 and the second water-cooling plate 62 are both connected to the radiator 64.

[0054] Specifically, the isolation plate 12 can be set in the control box 10 by welding or screwing to separate the control box 10 into a first sub-chamber 13 and a second sub-chamber 14. The inverter 30 can be set in the first sub-chamber 13, and the radiator 64 can be set in the second sub-chamber 14. The heat generated by the inverter 30 can be effectively isolated by the isolation plate 12 to prevent the heat generated by the inverter 30 from affecting the heat dissipation effect of the radiator 64 on the battery module 40.

[0055] The number of the heat dissipation pipes 639 can be two, and one end of the two heat dissipation pipes 639 can be connected to the radiator 64 respectively by means of threaded connection or snap-fitting. The other end of one heat dissipation pipe 639 can be connected to the first main pipe 631 located in the control box 10 by means of threaded connection or snap-fitting, and the other end of the other heat dissipation pipe 639 can be connected to the second main pipe 633 located in the control box 10 by means of threaded connection or snap-fitting, so as to connect the first main pipe 631, the radiator 64 and the second main pipe 633 through the heat dissipation pipe 639.

[0056] In one embodiment, Figure 5 As shown, when the battery module 40 is in working state and the temperature of the battery module 40 is high, the cooling medium can dissipate heat with the battery module 40 in the second water-cooling plate 62, flow into the first main pipeline 631 through the battery branch pipeline 637, and then flow into the radiator 64 through the heat dissipation pipeline 639 to dissipate heat. The cooling medium that has dissipated heat flows from another heat dissipation pipeline 639 through the second main pipeline 633 into another battery branch pipeline 637 and then enters the second water-cooling plate 62 to exchange heat with the battery module 40. This cycle is repeated to dissipate heat for the battery module 40, so that the battery module 40 can operate at a more suitable temperature, thereby preventing the battery module 40 from being damaged due to excessive temperature, and at the same time, the first connection part 51 and the second connection part 52 can be cooled.

[0057] See also Figure 2In some embodiments, the control box 10 is provided with an air inlet 15 and an air outlet 16 which are connected to and opposite to the second sub-chamber 14. The radiator 64 is provided between the air inlet 15 and the air outlet 16. A first cooling fan 641 is provided on the radiator 64. The first cooling fan 641 is used to form an airflow from the air inlet 15 to the air outlet 16.

[0058] Specifically, the side wall 11 of the control box 10 located in the second sub-chamber 14 may be provided with an air inlet 15, and the top wall of the control box 10 located in the second sub-chamber 14 may be provided with an air outlet 16 opposite to the air inlet 15. The radiator 64 may be provided in the second sub-chamber 14 between the air inlet 15 and the air outlet 16 by snapping or screwing, and one or more first cooling fans 641 may be provided on one side of the radiator 64. It should be noted that when the number of the first cooling fans 641 is multiple, for example, it may be 2, 3, 4, 5 or 6, etc., and is not limited here.

[0059] In one embodiment, after the cooling medium exchanges heat with the battery module 40 and enters the radiator 64 through the heat dissipation pipe 639, the first cooling fan 641 can generate wind, so that air can enter from the air inlet 15, be guided through the isolation plate 12 through the radiator 64, and then flow out from the air outlet 16 to form an airflow, thereby dissipating heat for the radiator 64 and improving the heat exchange efficiency between the radiator 64 and the cooling medium entering the radiator 64.

[0060] Please combine Figure 2 and Figure 6 In some embodiments, the cooling assembly 60 further includes a circulating water pump 65. The circulating water pump 65 is disposed on the pipeline 63. The circulating water pump 65 is used to drive the cooling medium in the pipeline 63 to circulate between the first water-cooled plate 61 and the radiator 64, and / or between the second water-cooled plate 62 and the radiator 64.

[0061] Specifically, the circulating water pump 65 can be arranged in the control box 10 by screwing or snapping, and the circulating water pump 65 can be connected to one end of the heat dissipation pipeline 639, and one end of the first main pipeline 631 or the second main pipeline 633, respectively, so that the circulating water pump 65 can drive the cooling medium in the pipeline 63 to circulate between the first water-cooled plate 61 and the radiator 64, and / or between the second water-cooled plate 62 and the radiator 64. The circulating water pump 65 can draw power from the inverter 30 or the battery module 40.

[0062] In one embodiment, Figure 4As shown, when the battery module 40 is in a charging state and the temperature of the battery module 40 is low, the circulating water pump 65 can drive the cooling medium to exchange heat with the inverter 30 in the first water-cooled plate 61, and then flow into the first main line 631 through the inverter branch line 635, and then flow into the battery branch line 637 through the first main line 631 to enter the second water-cooled plate 62 to heat the battery module 40, thereby effectively utilizing the heat generated by the inverter 30 to heat the battery module 40, so that the temperature of the battery module 40 rises to a more suitable temperature. Then, the cooling medium after heating the battery module 40 can flow from another battery branch pipeline 637 into the second main pipeline 633, flow into another inverter branch pipeline 635 through the second main pipeline 633, and flow into the first water cooling plate 61 through another inverter branch pipeline 635 to exchange heat with the inverter 30. This cycle is repeated to heat the battery module 40, and then the heat generated by the inverter 30 is effectively used to heat the battery module 40, so that the temperature of the battery module 40 rises to a more suitable temperature.

[0063] In another embodiment, Figure 5 As shown, when the battery module 40 is in working state and the temperature of the battery module 40 is high, the circulating water pump 65 can drive the cooling medium to dissipate heat with the battery module 40 in the second water-cooled plate 62, and then flow into the first main line 631 through the battery branch line 637, and then flow from the first main line 631 into the second main line 633, and then flow from the second main line 633 into another battery branch line 637 and enter the second water-cooled plate 62 to exchange heat with the battery module 40. This cycle is repeated to dissipate heat for the battery module 40, so that the battery module 40 can work at a more suitable temperature, preventing the battery module 40 from being damaged due to excessive temperature, and at the same time, the connector 50 can be cooled.

[0064] Please combine Figure 2 and Figure 6In some embodiments, a control valve 66 is provided on the pipeline 63. The control valve 66 is used to control the flow of the cooling medium passing through the first water-cooled plate 61. That is, the control valve 66 can be arranged on the heat dissipation branch pipeline 63 by screw connection. The number of control valves 66 can correspond to the number of heat dissipation branch pipelines 63 one by one, that is, for example, when the number of heat dissipation branch pipelines 63 is two, the number of control valves 66 can also be two, and the two control valves 66 can be respectively arranged on different heat dissipation branch pipelines 63, so that the flow of the cooling medium passing through the first water-cooled plate 61 can be controlled by the control valve 66, and the cooling medium of the first water-cooled plate 61 can be blocked from the cooling medium of the first main pipeline 631 and the second main pipeline 633 when the temperature of the battery module 40 is high and needs to be radiated, so that the cooling medium in the first water-cooled plate 61 after heat exchange with the inverter 30 will not flow into the second water-cooled plate 62 through the first main pipeline 631 or the second main pipeline 633 to heat the battery module 40 whose temperature is already too high.

[0065] In some embodiments, the cooling assembly 60 further includes a heater 67. The heater 67 is connected to the pipeline 63. The heater 67 is used to heat the cooling medium in the pipeline 63. That is, the heater 67 can be arranged in the control box 10 by snapping or screwing. The heater 67 can be connected to one end of the heat dissipation pipeline 639, and one end of the first main pipeline 631 or the second main pipeline 633, respectively, so as to heat the cooling medium in the pipeline 63 when the battery module 40 is in a charging state and the temperature is relatively low, so that the heated cooling medium can enter the pipeline 63 and flow into the second water cooling plate 62 to heat the battery module 40. It should be noted that the heater 67 can be a PCT (Positive Temperature Coefficient) liquid heater 67, etc., which is not limited here.

[0066] Please combine Figure 2 and Figure 7 In some embodiments, the first water-cooling plate 61 is vertically arranged. The first water-cooling plate 61 is provided with a heat dissipation fin 611. The heat dissipation fin 611 is arranged on a side of the first water-cooling plate 61 away from the inverter 30 and located on a side of the control box 10. The heat dissipation fin 611 is located outside the control box 10. The cooling assembly 60 further includes a second heat dissipation fan 68. The second heat dissipation fan 68 is arranged on the first water-cooling plate 61 and located on a side of the heat dissipation fin 611. The second heat dissipation fan 68 is used to generate wind to dissipate heat from the heat dissipation fin 611.

[0067] Specifically, the first water-cooling plate 61 is vertically arranged on the side of the inverter 30 facing the side wall 11 of the control box 10. The heat dissipation fins 611 can be arranged in an integrally formed manner on the side of the first water-cooling plate 61 away from the inverter 30 and located on the side of the control box 10, and also located outside the control box 10, so that when the first water-cooling plate 61 dissipates heat for the inverter 30, the heat dissipation fins 611 can be used to dissipate heat for the cooling medium in the first water-cooling plate 61 after heat exchange with the inverter 30.

[0068] The second cooling fan 68 can be set on the first water-cooled plate 61 and on one side of the cooling fin 611 by welding or snapping, so that the second cooling fan 68 can generate wind to dissipate heat to the cooling fin 611, thereby improving the heat dissipation efficiency of the cooling fin 611 to dissipate heat from the cooling medium in the first water-cooled plate 61 after heat exchange with the inverter 30. It should be noted that the number of the second cooling fans 68 can be one or more. When the number of the second cooling fans 68 is multiple, for example, it can be 2, 3, 4, 5 or 6, etc., which is not limited here.

[0069] In addition, if Figure 7 As shown, the first water-cooling plate 61 may be provided with a flow channel 613 inside, and a cooling medium may flow in the flow channel 613, so that when the temperature of the inverter 30 is high, the cooling medium flowing in the flow channel 613 can dissipate heat for the inverter 30. It should be noted that a water inlet 615 and a water outlet 617 may also be provided on the first water-cooling plate 61, and the water inlet 615 and the water outlet 617 may be respectively connected to the flow channel 613, so that the cooling medium can be injected into the flow channel 613 through the water inlet 615, and the cooling medium can also flow out from the water outlet 617, so that the circulation of the cooling medium can be realized to dissipate heat for the inverter 30.

[0070] Please combine Figure 2 and Figure 6In some embodiments, the cooling assembly 60 includes a radiator 64, a first cooling fan 641, a second cooling fan 68, a control valve 66, and a circulating water pump 65. The radiator 64, the control valve 66, and the circulating water pump 65 are all arranged on the pipeline 63. The first cooling fan 641 is arranged on the radiator 64. The second cooling fan 68 is arranged on the first water-cooled plate 61. The first water-cooled plate 61 and the second water-cooled plate 62 are connected in parallel. The circulating water pump 65 is arranged between the radiator 64 and the first water-cooled plate 61. The first cooling fan 641 is used to dissipate heat for the second water-cooled plate 62. The second cooling fan 68 is used to dissipate heat for the first water-cooled plate 61. That is, the embodiment of the present application can dissipate heat for the inverter 30 through the first water-cooling plate 61 and the second cooling fan 68 when the temperature of the inverter 30 is high, and dissipate heat for the battery module 40 through the radiator 64, the first cooling fan 641, the control valve 66, the circulating water pump 65, the cooling medium in the pipeline 63 and the second water-cooling plate 62 when the temperature of the battery module 40 is high; and when the temperature of the battery module 40 is low, the heat generated by the inverter 30 is used to heat the battery module 40 through the first water-cooling plate 61, the control valve 66, the circulating water pump 65, the cooling medium in the pipeline 63 and the second water-cooling plate 62, thereby independently controlling the temperatures of the inverter 30 and the battery module 40 to achieve precise temperature control in different zones, avoiding the influence of the high temperature zone (inverter 30) on the low temperature zone (battery module 40), which is more conducive to temperature control of the energy storage device 100.

[0071] See also Figure 2 In some embodiments, the inverter 30 includes an inverter unit 31. The inverter unit 31 includes a control board 311. A first controller 313 is provided on the control board 311. The first controller 313 is used to control the control valve 66 and the second cooling fan 68 to remain closed when the temperature of the inverter 30 is less than the first inversion temperature threshold and the temperature of the battery module 40 is within a preset temperature range; and / or, the first controller 313 is used to control the second cooling fan 68 to open and control the control valve 66 to remain closed when the temperature of the inverter 30 is greater than or equal to the first inversion temperature threshold and less than the second inversion temperature threshold and the temperature of the battery module 40 is within a preset temperature range, and the second inversion temperature threshold is greater than the first inversion temperature threshold; and / or, the first controller 313 is used to control the inverter 30 to enter a standby state, and control the second cooling fan 68 to open and the control valve 66 to remain closed when the temperature of the inverter 30 is greater than or equal to the second inversion temperature threshold and the temperature of the battery module 40 is within a preset temperature range.

[0072] The first inversion temperature may refer to any temperature value in the range of 70° C. to 75° C. The second inversion temperature may refer to 90° C., etc., which is not limited here. The preset temperature range may refer to any temperature value in the range of 10° C. to 55° C.

[0073] Specifically, the inverter 30 may include an inverter unit 31. The inverter unit 31 may include a control board 311 and a power board 315. A first controller 313 may be provided on the control board 311. A first temperature collecting component 317 may be provided on the first water cooling plate 61. The first temperature collecting component 317 may be used to detect the temperature of the inverter 30 in real time. A battery protection board 41 may be provided on one side of the battery module 40. A second temperature collecting component 45 may be provided on the battery protection board 41. The second temperature collecting component 45 may be used to detect the temperature of the battery module 40 in real time. The first temperature collecting component 317 and the second temperature collecting component 45 may be electrically connected to the first controller 313, so that the first controller 313 controls the opening or closing of the control valve 66 and the second cooling fan 68 according to the temperature collected by the first temperature collecting component 317 and the temperature collected by the second temperature collecting component 45, so as to realize automatic triggering, which is convenient and fast, so that the temperature of the inverter 30 can be quickly and effectively reduced. It should be noted that both the first temperature sensing component 317 and the second temperature sensing component 45 can be temperature sensors, which is not limited here.

[0074] In one embodiment, when the inverter 30 and the battery module 40 are in operation, the first temperature sampling component 317 can collect the temperature of the inverter 30 in real time, and the second temperature sampling component 45 can collect the temperature of the battery module 40 in real time. At this time, if the temperature of the inverter 30 collected by the first temperature sampling component 317 obtained by the first controller 313 is lower than the first inverter temperature threshold, and the temperature of the battery module 40 collected by the second temperature sampling component 45 is within a preset temperature range, the first controller 313 can control the valve 66 and the second cooling fan 68 to remain closed, so as to utilize the first water cooling plate 61 to naturally dissipate heat for the inverter 30.

[0075] In another embodiment, when the inverter 30 and the battery module 40 are in operation, the first temperature sampling component 317 can collect the temperature of the inverter 30 in real time, and the second temperature sampling component 45 can collect the temperature of the battery module 40 in real time. At this time, if the temperature of the inverter 30 collected by the first temperature sampling component 317 obtained by the first controller 313 is greater than or equal to the first inverter temperature threshold, and the temperature of the battery module 40 collected by the second temperature sampling component 45 is within a preset temperature range, then the first controller 313 can control the second cooling fan 68 to turn on, and control the control valve 66 to remain closed, so as to enhance air convection through the second cooling fan 68, improve the heat dissipation efficiency of the first water cooling plate 61 to dissipate heat to the inverter 30, and reduce the temperature of components inside the inverter 30.

[0076] In another embodiment, when the inverter 30 and the battery module 40 are in operation, the first temperature sampling component 317 can collect the temperature of the inverter 30 in real time, and the second temperature sampling component 45 can collect the temperature of the battery module 40 in real time. At this time, if the temperature of the inverter 30 collected by the first temperature sampling component 317 obtained by the first controller 313 is greater than or equal to the second inverter temperature threshold, and the temperature of the battery module 40 collected by the second temperature sampling component 45 is within a preset temperature range, then the first controller 313 can control the inverter 30 to enter a standby state, and control the second cooling fan 68 to turn on and the control valve 66 to remain closed, so as to prevent the inverter 30 from burning out due to the inverter 30 continuing to run due to excessive temperature.

[0077] See also Figure 2 In some embodiments, a second controller 43 is provided on the battery module 40. The second controller 43 is used to control the circulating water pump 65 and the first cooling fan 641 to operate at maximum power, control the radiator 64 to open, and control the control valve 66 to close when the temperature of the battery module 40 is greater than or equal to the first battery temperature threshold and less than the second battery temperature threshold, and the second battery temperature threshold is greater than the first battery temperature threshold; and / or, the second controller 43 is used to control the battery module 40 to enter the standby state, and control the circulating water pump 65 and the first cooling fan 641 to operate at maximum power, control the radiator 64 to open, and control the control valve 66 to close when the temperature of the battery module 40 is greater than or equal to the second battery temperature threshold.

[0078] The first battery temperature threshold may be, for example, any temperature value in the range of 20°C to 40°C, without limitation. The second battery temperature threshold may be, for example, any temperature value in the range of 40°C to 55°C, without limitation. The second controller 43 may be electrically connected to the second temperature sensing element 45.

[0079] Specifically, in one embodiment, when the battery module 40 is in operation, the second temperature sampling component 45 can collect the temperature of the battery module 40 in real time. At this time, if the temperature of the battery module 40 collected by the second temperature sampling component 45 obtained by the second controller 43 is greater than or equal to the first battery temperature threshold and less than the second battery temperature threshold, the circulating water pump 65 and the first cooling fan 641 are controlled to operate at maximum power, and the radiator 64 is controlled to open and the control valve 66 is closed, so that the cooling medium in the pipeline 63 circulates between the pipeline 63, the second water cooling plate 62 and the radiator 64 to dissipate heat for the battery module 40, thereby cooling the battery module 40.

[0080] In another embodiment, when the battery module 40 is in operation, the second temperature collecting component 45 can collect the temperature of the battery module 40 in real time. At this time, if the temperature of the battery module 40 collected by the second temperature collecting component 45 obtained by the second controller 43 is greater than or equal to the second battery temperature threshold, the battery module 40 is controlled to be in standby state, and the circulating water pump 65 and the first cooling fan 641 are controlled to run at maximum power, the radiator 64 is turned on, and the control valve 66 is closed to prevent the battery module 40 from being burned due to excessive temperature and continuing to run. At the same time, the cooling medium in the pipeline 63 can circulate between the pipeline 63, the second water cooling plate 62 and the radiator 64 to dissipate heat for the battery module 40, thereby quickly cooling the battery module 40.

[0081] See also Figure 2 In some embodiments, the cooling assembly 60 further includes a heater 67. The second controller 43 is used to control the radiator 64, the second cooling fan 68 and the first cooling fan 641 to remain closed, and control the control valve 66, the circulating water pump 65 and the heater 67 to be turned on when the temperature of the battery module 40 is less than the third battery temperature threshold and the battery module 40 is in a charging state, and the third battery temperature threshold is less than the first battery temperature threshold; and / or, the second controller 43 is used to control the radiator 64, the first cooling fan 641 and the second cooling fan 68 to be turned off, and control the circulating water pump 65 and the control valve 66 to be turned on when the temperature of the battery module 40 is greater than or equal to the third battery temperature threshold and less than the first battery temperature threshold, the battery module 40 is in a charging state and the inverter 30 is in an operating state.

[0082] The third battery temperature threshold may be any temperature value within the range of 0° C. to 5° C., which is not limited here.

[0083] That is, in one embodiment, the second temperature sensing component 45 can collect the temperature of the battery module 40 in real time. At this time, if the temperature of the battery module 40 collected by the second temperature sensing component 45 obtained by the second controller 43 is less than the third battery temperature threshold and the battery module 40 is in a charging state, the radiator 64, the second cooling fan 68 and the first cooling fan 641 are controlled to remain closed, and the control valve 66, the circulating water pump 65 and the heater 67 are controlled to be turned on, so as to utilize the heat generated by the inverter 30 and the heater 67 to heat the cooling medium in the pipeline 63, so that the cooling medium flows from the pipeline 63 into the second water cooling plate 62 driven by the circulating water pump 65 to heat the battery module 40, thereby realizing rapid heating of the battery module 40.

[0084] In another embodiment, the second temperature sensing component 45 can collect the temperature of the battery module 40 in real time. At this time, if the temperature of the battery module 40 collected by the second temperature sensing component 45 obtained by the second controller 43 is greater than or equal to the third battery temperature threshold and less than the first battery temperature threshold, and the battery module 40 is in a charging state and the inverter 30 is in a working state, the radiator 64, the first cooling fan 641 and the second cooling fan 68 are controlled to be closed, and the circulating water pump 65 and the control valve 66 are controlled to be opened, so as to use the temperature generated by the inverter 30 to heat the cooling medium in the pipeline 63, so that the cooling medium flows from the pipeline 63 into the second water cooling plate 62 driven by the circulating water pump 65 to heat the battery module 40.

[0085] In another embodiment, the second temperature sensing component 45 can collect the temperature of the battery module 40 in real time. At this time, if the temperature of the battery module 40 collected by the second temperature sensing component 45 obtained by the second controller 43 is greater than or equal to the third battery temperature threshold and less than the first battery temperature threshold, and the battery module 40 is in a charging state and the inverter 30 is in a standby state, the radiator 64, the first cooling fan 641, the control valve 66 and the second cooling fan 68 are controlled to be closed, and the circulating water pump 65 and the heater 67 are controlled to be turned on, so as to use the temperature generated by the heater 67 to heat the cooling medium in the pipeline 63, so that the cooling medium flows from the pipeline 63 into the second water cooling plate 62 driven by the circulating water pump 65 to heat the battery module 40.

[0086] In some embodiments, the energy storage device 100 can be a household energy storage device or a balcony photovoltaic energy storage device. Among them, household energy storage devices are usually relatively large, and their positions are relatively fixed and cannot be moved after installation. The power capacity is relatively large, and the power provided is relatively large; while the balcony photovoltaic energy storage device is relatively small and easy to carry and move. It can be moved according to the user's power demand, such as from the balcony to the garage or even outdoors, etc. The power capacity is relatively small, and the power provided is also relatively small. In some embodiments, the energy storage device 100 can also be an outdoor portable energy storage device that can be used outdoors to output AC power.

[0087] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An energy storage device, characterized in that: The energy storage device comprises: A control box, wherein an inverter is arranged in the control box; At least one battery box, wherein a battery module is arranged in the battery box; The bottom surface of the control box is provided with a first connection part, the top surface of each of the at least one battery box is provided with a second connection part, the bottom surface of each of the at least one battery box is provided with the first connection part, the first connection part and the second connection part are pluggable, the first connection part and the second connection part are both provided with conductive terminals, after the control box and each of the at least one battery box are connected and stacked through their respective first connection parts and second connection parts, the inverter in the control box and the battery modules in each of the at least one battery box are electrically connected through the conductive terminals; A cooling assembly, the cooling assembly comprising a first water-cooling plate, a second water-cooling plate and a pipeline, the first water-cooling plate being fixed to the heat dissipation surface of the inverter in the control box, the second water-cooling plate being fixed to the heat dissipation surface of the battery module in each of the at least one battery box, after the control box and at least one battery box are stacked and fixed, the pipeline is passed through the first connecting portion and the second connecting portion between the control box and at least one battery box, and communicates with the first water-cooling plate and the second water-cooling plate.

2. The energy storage device according to claim 1, characterized in that: The first connection portion is concave, and the second connection portion is convex.

3. The energy storage device according to claim 1, characterized in that: The pipeline includes a first main pipeline, a second main pipeline, an inverter branch pipeline and a battery branch pipeline. The first main pipeline and the second main pipeline are arranged in the first connecting part and the second connecting part. The inverter branch pipeline connects the first main pipeline, the first water-cooling plate and the second main pipeline. The inverter branch pipeline is located in the control box. The battery branch pipeline connects the first main pipeline, the second water-cooling plate and the second main pipeline. The battery branch pipeline is located in at least one of the battery boxes.

4. The energy storage device according to claim 3, characterized in that: The first connecting portion and the second connecting portion are both provided with a first connecting port and a second connecting port, the first main line is provided through the first connecting port, the second main line is provided through the second connecting port, and the first main line and the second main line are both parallel to the side wall of the control box.

5. The energy storage device according to claim 3, characterized in that: The control box is provided with an isolation plate, and the isolation plate is configured to separate the control box into a first sub-chamber and a second sub-chamber. The cooling assembly also includes a radiator, and the pipeline also includes a heat dissipation pipeline, and the heat dissipation pipeline connects the first main pipeline, the radiator and the second main pipeline. The inverter is arranged in the first sub-chamber, the radiator is arranged in the second sub-chamber, and the first water-cooling plate and the second water-cooling plate are both connected to the radiator.

6. The energy storage device according to claim 5, characterized in that: The control box is provided with an air inlet and an air outlet which are connected to the second sub-chamber and arranged opposite to each other, the radiator is arranged between the air inlet and the air outlet, and the radiator is provided with a first cooling fan, which is used to form an airflow from the air inlet to the air outlet.

7. The energy storage device according to claim 5, characterized in that: The cooling assembly also includes a circulating water pump, which is arranged on the pipeline and is used to drive the cooling medium in the pipeline to circulate between the first water-cooled plate and the radiator, and / or between the second water-cooled plate and the radiator.

8. The energy storage device according to claim 1, characterized in that: The pipeline is provided with a control valve, and the control valve is used to control the flow of the cooling medium passing through the first water-cooling plate.

9. The energy storage device according to claim 1, characterized in that: The cooling assembly further includes a heater, which is connected to the pipeline and is used to heat the cooling medium in the pipeline.

10. The energy storage device according to claim 1, characterized in that: The first water-cooling plate is vertically arranged, and heat dissipation fins are arranged on the first water-cooling plate. The heat dissipation fins are arranged on the side of the first water-cooling plate away from the inverter and located on the side of the control box. The heat dissipation fins are located outside the control box. The cooling assembly also includes a second heat dissipation fan, which is arranged on the first water-cooling plate and on one side of the heat dissipation fins. The second heat dissipation fan is used to generate wind to dissipate heat from the heat dissipation fins.

11. The energy storage device according to claim 1, characterized in that: The cooling component includes a radiator, a first cooling fan, a second cooling fan, a control valve and a circulating water pump. The radiator, the control valve and the circulating water pump are all arranged on the pipeline. The first cooling fan is arranged on the radiator, and the second cooling fan is arranged on the first water-cooled plate. The first water-cooled plate and the second water-cooled plate are connected in parallel. The circulating water pump is arranged between the radiator and the first water-cooled plate. The first cooling fan is used to dissipate heat to the second water-cooled plate, and the second cooling fan is used to dissipate heat to the first water-cooled plate.

12. The energy storage device according to claim 11, characterized in that: The inverter includes an inverter unit, the inverter unit includes a control board, and a first controller is arranged on the control board; The first controller is used for controlling the control valve and the second cooling fan to remain closed when the temperature of the inverter is less than a first inverter temperature threshold and the temperature of the battery module is within a preset temperature range; and / or The first controller is used to control the second cooling fan to turn on and control the control valve to remain closed when the temperature of the inverter is greater than or equal to a first inverter temperature threshold and less than a second inverter temperature threshold and the temperature of the battery module is within the preset temperature range, and the second inverter temperature threshold is greater than the first inverter temperature threshold; and / or The first controller is used to control the inverter to enter a standby state, and control the second cooling fan to turn on and the control valve to remain closed when the temperature of the inverter is greater than or equal to the second inverter temperature threshold and the temperature of the battery module is within the preset temperature range.

13. The energy storage device according to claim 11, characterized in that: The battery module is provided with a second controller, and the second controller is used to control the circulating water pump and the first cooling fan to operate at maximum power, and control the radiator to be turned on and the control valve to be closed when the temperature of the battery module is greater than or equal to the first battery temperature threshold and less than the second battery temperature threshold, and the second battery temperature threshold is greater than the first battery temperature threshold; and / or The second controller is used to control the battery module to enter a standby state when the temperature of the battery module is greater than or equal to the second battery temperature threshold, and to control the circulating water pump and the first cooling fan to operate at maximum power, the radiator to open, and the control valve to close.

14. The energy storage device according to claim 13, characterized in that: The cooling assembly further includes a heater, and the second controller is used to control the radiator, the second cooling fan and the first cooling fan to remain closed, and control the control valve, the circulating water pump and the heater to turn on when the temperature of the battery module is less than a third battery temperature threshold and the battery module is in a charging state, and the third battery temperature threshold is less than the first battery temperature threshold; and / or The second controller is used for controlling the radiator, the first cooling fan and the second cooling fan to be turned off, and controlling the circulating water pump and the control valve to be turned on when the temperature of the battery module is greater than or equal to the third battery temperature threshold and less than the first battery temperature threshold, the battery module is in a charging state and the inverter is in a working state.

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