Energy storage device

Abstract

The energy storage device comprises a battery pack and an energy storage inverter, the battery pack comprises a battery body and a first cooling component, and the first cooling component is configured to adjust the temperature of the battery body; the energy storage inverter comprises an inverter body and a second cooling part, and the second cooling part is configured to adjust the temperature of the inverter body; the liquid cooling unit is connected with the first cooling component to form a first cooling loop, the liquid cooling unit is connected with the second cooling component to form a second cooling loop, and the first cooling loop and the second cooling loop are mutually independent. The first cooling loop and the second cooling loop are arranged to be mutually independent, so that the cooling temperature of the first cooling loop can be mutually matched with the proper working temperature of the battery pack, and the cooling temperature of the second cooling loop can be mutually matched with the proper working temperature of the energy storage inverter; and the battery pack and the energy storage inverter can work at respective appropriate temperatures, so that the stable work of the battery pack and the energy storage inverter is facilitated, and the service life of the energy storage device is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and specifically relates to an energy storage device. Background Art

[0002] An energy storage device usually includes a battery pack and an energy storage inverter. Among them, the battery pack is used to store electrical energy or supply power to electrical equipment, and the energy storage inverter is used to achieve efficient conversion, management, and control of electrical energy.

[0003] Currently, during the use of the battery pack and the energy storage inverter, heat is generated. If the battery pack and the energy storage inverter work at an inappropriate temperature for a long time, the lifespan of the energy storage device will be shortened. Summary of the Invention

[0004] Embodiments of this application provide an energy storage device for cooling the battery pack and the energy storage inverter to improve the technical problem of shortened lifespan of the energy storage device.

[0005] In a first aspect, embodiments of this application provide an energy storage device, including a battery pack and an energy storage inverter. The battery pack includes a battery body and a first cooling component, and the first cooling component is configured to adjust the temperature of the battery body; the energy storage inverter includes an inverter body and a second cooling component, and the second cooling component is configured to adjust the temperature of the inverter body; a liquid cooling unit is connected to the first cooling component to form a first cooling circuit, and is connected to the second cooling component to form a second cooling circuit, and the first cooling circuit and the second cooling circuit are independent of each other.

[0006] In a possible implementation, a plurality of battery packs are provided, and the plurality of battery packs are arranged along the height direction of the energy storage device, and the first cooling components of the plurality of battery packs are connected in parallel to the first cooling circuit.

[0007] In a possible implementation, the liquid cooling unit has a first liquid inlet and a first liquid outlet, the first cooling component has a first sub-liquid inlet and a first sub-liquid outlet, the first liquid outlet is connected to the first sub-liquid inlet through a first pipeline, and the first liquid inlet is connected to the first sub-liquid outlet through a second pipeline.

[0008] In a possible implementation, the liquid cooling unit has a first surface, and both the first liquid inlet and the first liquid outlet are provided on the first surface and are located on the same side in the width direction of the energy storage device.

[0009] In a possible implementation, the liquid cooling unit has a second liquid inlet and a second liquid outlet, the second cooling component has a second sub-liquid inlet and a second sub-liquid outlet, the second liquid outlet is connected to the second sub-liquid inlet through a third pipeline, and the second liquid inlet is connected to the second sub-liquid outlet through a fourth pipeline.

[0010] In a possible implementation, the liquid cooling unit has a first surface, and both the second liquid inlet and the second liquid outlet are disposed on the first surface and on the same side in the width direction of the energy storage device.

[0011] In a possible implementation, the diameter of the third pipeline is smaller than the diameters of the first pipeline and the second pipeline; and / or, the diameter of the fourth pipeline is smaller than the diameters of the first pipeline and the second pipeline.

[0012] In a possible implementation, the third pipeline includes a first pipe section and a second pipe section. One end of the first pipe section communicates with the second liquid inlet, and the other end is connected to the second pipe section. The end of the second pipe section away from the first pipe section communicates with the second sub-liquid outlet. The fourth pipeline includes a third pipe section and a fourth pipe section connected to each other. One end of the third pipe section communicates with the second liquid outlet, and the other end is connected to the fourth pipe section. The end of the fourth pipe section away from the third pipe section communicates with the second sub-liquid inlet. Wherein, the first pipe section and the third pipe section are arranged side by side and both extend horizontally, and the second pipe section and the fourth pipe section are arranged side by side and both extend vertically.

[0013] In a possible implementation, the inverter body includes a housing, and the second cooling component is disposed inside the housing.

[0014] In a possible implementation, the liquid cooling unit is disposed between the energy storage inverter and the battery pack.

[0015] In a possible implementation, the energy storage device further includes a cabinet body, the cabinet body has a battery compartment and an electrical compartment, the battery pack is disposed in the battery compartment, and the liquid cooling unit and the energy storage inverter are disposed in the electrical compartment.

[0016] In a possible implementation, the electrical compartment is disposed at the bottom of the battery compartment.

[0017] In a possible implementation, the energy storage device further includes a plurality of first pressure relief components, which are disposed on the cabinet body and are configured to relieve the pressure in the battery compartment when the temperature or pressure in the battery compartment reaches a first threshold.

[0018] In a possible implementation, the battery body is provided with a second pressure relief component, and the second pressure relief component is configured to discharge the emissions in the battery body when the temperature or pressure in the battery body reaches a second threshold; and / or, the cabinet body has a first wall facing the second pressure relief component and a second wall facing away from the second pressure relief component. At least one of the first pressure relief components is provided on the first wall, and at least one of the first pressure relief components is provided on the second wall. The number of the first pressure relief components provided on the first wall is greater than the number of the first pressure relief components provided on the second wall.

[0019] In a possible implementation, the energy storage device further includes a cabinet body, and the cabinet body includes a cabinet main body and a cabinet door. The cabinet main body has an operation port for placing the battery pack, the energy storage inverter, and the liquid cooling unit into the cabinet main body. The cabinet door is used to open and close the operation port, and a heat insulation layer is provided inside the side wall of the cabinet main body.

[0020] In a possible implementation, a metal frame is further provided inside the side wall of the cabinet main body.

[0021] In a possible implementation, the metal frame has a hollow cavity, and the heat insulation layer is arranged in the hollow cavity.

[0022] Advantages of the embodiments of the present application:

[0023] In the embodiments of the present application, by arranging the first cooling circuit and the second cooling circuit to be independent of each other, the cooling temperature of the first cooling circuit can be matched with the suitable operating temperature of the battery pack, and the cooling temperature of the second cooling circuit can be matched with the suitable operating temperature of the energy storage inverter. Thus, the battery pack and the energy storage inverter can operate at their respective suitable temperatures, which helps the battery pack and the energy storage inverter to operate stably and extends the service life of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 FIG. is a schematic structural diagram of the energy storage device provided by the embodiment of the present application from one perspective;

[0026] Figure 2 FIG. is a schematic structural diagram of the energy storage device provided by the embodiment of the present application from another perspective;

[0027] Figure 3 Schematic diagram of the internal structure of the energy storage device provided by the embodiment of the present application;

[0028] Figure 4 Schematic diagram of the structures of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline provided by the embodiment of the present application;

[0029] Figure 5 Schematic diagram of the structure of the battery pack provided by the embodiment of the present application;

[0030] Figure 6 Schematic diagram of the structure of the liquid cooling unit provided by the embodiment of the present application;

[0031] Figure 7 Schematic diagram of the structure of the energy storage inverter provided by the embodiment of the present application;

[0032] Figure 8 Schematic diagram of the structure of the energy storage inverter provided by some other embodiments of the present application;

[0033] Figure 9 Exploded view of the side wall of the cabinet body provided by the embodiment of the present application.

[0034] Description of reference numerals:

[0035] 100 - Energy storage device; 10 - Cabinet; 11 - Cabinet body; 111 - Battery compartment; 112 - Electrical compartment; 113 - Metal frame; 1131 - Hollow cavity; 114 - First plate; 115 - Second plate; 116 - Heat insulation layer; 12 - Cabinet door; 13 - Partition board; 20 - Battery pack; 21 - Battery body; 22 - First cooling component; 221 - First sub - inlet; 222 - First sub - outlet; 23 - Second pressure relief component; 30 - Liquid cooling unit; 31 - First inlet; 32 - First outlet; 33 - Second inlet; 34 - Second outlet; 40 - Energy storage inverter; 41 - Inverter body; 42 - Second cooling component; 421 - Second sub - inlet; 422 - Second sub - outlet; 50 - First pressure relief component; 61 - First pipeline; 62 - Second pipeline; 621 - Fifth pipe section; 622 - Sixth pipe section; 63 - Third pipeline; 631 - First pipe section; 632 - Second pipe section; 64 - Fourth pipeline; 641 - Third pipe section; 642 - Fourth pipe section. Detailed implementation manners

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the orientation terms such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0037] Referring to Figures 1 to 8 , according to the first aspect of the present application, a energy storage device 100 is provided. The energy storage device 100 includes a battery pack 20 and a energy storage inverter 40.

[0038] Referring to Figure 5 , the battery pack 20 includes a battery body 21 and a first cooling component 22. The first cooling component 22 is configured to adjust the temperature of the battery body 21. Referring to Figure 7 and Figure 8 , the energy storage inverter 40 includes an inverter body 41 and a second cooling component 42. The second cooling component 42 is configured to adjust the temperature of the inverter body 41. Referring to Figure 3 , the liquid cooling unit 30 is connected to the first cooling component 22 to form a first cooling loop, and the liquid cooling unit 30 is connected to the second cooling component 42 to form a second cooling loop. The first cooling loop and the second cooling loop are independent of each other.

[0039] It can be understood that there are two coolant pipelines (not shown in the figure) in the liquid cooling unit 30. One of the two coolant pipelines is arranged in the first cooling loop, and the other is arranged in the second cooling loop. The first cooling loop and the second cooling loop can operate independently of each other without interference.

[0040] Among them, the two coolant pipelines in the liquid cooling unit 30 are respectively a first coolant pipeline and a second coolant pipeline. The first coolant pipeline is used to accommodate the cooling medium for adjusting the temperature of the battery body 21, and the second coolant pipeline is used to accommodate the cooling medium for adjusting the temperature of the inverter body 41. According to actual needs, the first coolant pipeline and the second coolant pipeline can accommodate the same or different cooling media.

[0041] Among them, the first coolant pipeline and the second coolant pipeline can be arranged side by side vertically or side by side horizontally.

[0042] The specific structure of the liquid cooling unit 30 can refer to the prior art and will not be elaborated here.

[0043] Generally, the suitable operating temperature of the battery pack 20 is lower than that of the energy storage inverter 40. If the energy storage inverter 40 and the battery pack 20 share a cooling circuit, at least one of the battery pack 20 and the energy storage inverter 40 will not be able to operate at a suitable temperature, resulting in unstable operation of the battery pack 20 and the energy storage inverter 40 and a shortened lifespan of the energy storage device 100.

[0044] In the embodiments of the present application, by arranging the first cooling circuit and the second cooling circuit independently of each other, the cooling temperature of the first cooling circuit can be matched with the suitable operating temperature of the battery pack 20, and the cooling temperature of the second cooling circuit can be matched with the suitable operating temperature of the energy storage inverter 40. Thus, the battery pack 20 and the energy storage inverter 40 can operate at their respective suitable temperatures, which helps the battery pack 20 and the energy storage inverter 40 to operate stably and extends the service life of the energy storage device 100.

[0045] In some embodiments, the energy storage device 100 further includes a cabinet 10. The cabinet 10 has a battery compartment 111 and an electrical compartment 112. The battery pack 20 is disposed in the battery compartment 111, and the liquid cooling unit 30 and the energy storage inverter 40 are disposed in the electrical compartment 112. Such an arrangement helps to reduce the influence of the external environment on the interior of the energy storage device 100.

[0046] In addition, since the energy storage inverter 40 generates a large amount of heat, if the energy storage inverter 40 is disposed in the battery compartment 111, it will affect the operating stability of the battery pack 20. In the embodiments of the present application, by separately arranging the energy storage inverter 40 and the battery pack 20 in different compartments, it helps to reduce the influence of the heat generated by the energy storage inverter 40 on the operating stability of the battery pack 20, and further helps to improve the thermal management effect inside the energy storage device 100 and extend the service life of the energy storage device 100.

[0047] Refer to Figure 1 , in some embodiments, the cabinet 10 includes a cabinet body 11 and a cabinet door 12. The battery compartment 111 and the electrical compartment 112 are disposed in the cabinet body 11. The cabinet body 11 has an operation opening. Both the battery compartment 111 and the electrical compartment 112 communicate with the operation opening. The operation opening is used for placing the battery pack 20 into the battery compartment 111 and for placing the energy storage inverter 40 and the liquid cooling unit 30 into the electrical compartment 112. The cabinet door 12 is used to open and close the operation opening.

[0048] Refer to Figure 3 , in some embodiments, a partition plate 13 is disposed inside the cabinet body 11. The partition plate 13 divides the interior of the cabinet body 11 into a battery compartment 111 and an electrical compartment 112.

[0049] In the related art, in order to improve the safety and environmental adaptability of the energy storage device 100, an underground wiring method is usually adopted. Therefore, the working devices of the energy storage inverter 40 need to be connected to the underground wire harness. In some embodiments, the electrical compartment 112 is arranged at the bottom of the battery compartment 111 to facilitate the connection between the energy storage inverter 40 in the electrical compartment 112 and the underground wire harness, reducing the difficulty of power connection of the energy storage device 100.

[0050] In some embodiments, a plurality of battery packs 20 are provided, and the plurality of battery packs 20 are arranged along the height direction of the energy storage device 100. The first cooling components 22 of the plurality of battery packs 20 are connected in parallel in the first cooling circuit.

[0051] It can be understood that the combination formed after the plurality of battery packs 20 are electrically connected is a battery cluster.

[0052] In the embodiments of the present application, the first cooling components 22 of the plurality of battery packs 20 are connected in parallel in the first cooling circuit, which helps to control the temperature distribution, reduce the phenomenon of local overheating, improve the temperature consistency of each battery pack 20, and extend the service life of the energy storage device 100.

[0053] Referring to Figure 4 、 Figure 5 and Figure 6 , in some embodiments, the liquid cooling unit 30 has a first liquid inlet 31 and a first liquid outlet 32. The first cooling component 22 has a first sub-liquid inlet 221 and a first sub-liquid outlet 222. The first liquid outlet 32 is connected to the first sub-liquid inlet 221 through a first pipeline 61, and the first liquid inlet 31 is connected to the first sub-liquid outlet 222 through a second pipeline 62.

[0054] It can be understood that the cooling medium in the first cooling circuit passes through the first liquid outlet 32, the first pipeline 61, the first sub-liquid inlet 221, the first sub-liquid outlet 222, the second pipeline 62 and the first liquid inlet 31, and circulates in this way.

[0055] In some embodiments, the partition plate 13 is provided with through holes for the first pipeline 61 and the second pipeline 62 to pass through.

[0056] In some embodiments, the first pipeline 61 is sleeved with a first sealing ring, and the first sealing ring is used to seal the gap between the first pipeline 61 and the corresponding through hole. The second pipeline 62 is sleeved with a second sealing ring, and the second sealing ring is used to seal the gap between the second pipeline 62 and the corresponding through hole.

[0057] In some embodiments, the first cooling component 22 is a liquid cooling plate, and a flow channel is formed inside the liquid cooling plate. One end of the flow channel communicates with the first sub-liquid inlet 221, and the other end communicates with the first sub-liquid outlet 222.

[0058] In some embodiments, the liquid cooling unit 30 has a first surface, and the first liquid inlet 31 and the first liquid outlet 32 ​​are both disposed on the first surface and located on the same side of the energy storage device 100 in the width direction.

[0059] Exemplarily, the surface of the liquid cooling unit 30 facing the cabinet door 12 is the first surface.

[0060] Exemplarily, the first liquid inlet 31 and the first liquid outlet 32 ​​are arranged at intervals in the vertical direction, the first liquid inlet 31 is located above the first liquid outlet 32, and the first liquid inlet 31 and the first liquid outlet 32 ​​are arranged to the right.

[0061] Reference Figure 4 , Figure 6 , Figure 7 and Figure 8 In some embodiments, the liquid cooling unit 30 has a second liquid inlet 33 and a second liquid outlet 34, the second cooling component 42 has a second sub-liquid inlet 421 and a second sub-liquid outlet 422, the second liquid outlet 34 is connected to the second sub-liquid inlet 421 through a third pipeline 63, and the second liquid inlet 33 is connected to the second sub-liquid outlet 422 through a fourth pipeline 64.

[0062] It can be understood that the cooling medium in the second cooling circuit can circulate through the second liquid outlet 34 , the third pipeline 63 , the second sub-liquid inlet 421 , the second sub-liquid outlet 422 , the fourth pipeline 64 and the second liquid inlet 33 .

[0063] In some embodiments, the second liquid inlet 33 and the second liquid outlet 34 are both disposed on the first surface and are located on the same side of the energy storage device 100 in the width direction.

[0064] Exemplarily, the second liquid inlet 33 and the second liquid outlet 34 are arranged at intervals in the vertical direction, the second liquid inlet 33 is located above the second liquid outlet 34, and the second liquid inlet 33 and the second liquid outlet 34 are arranged on the left.

[0065] In some embodiments, the third pipeline 63 and the fourth pipeline 64 are located in the electrical compartment 112 and are bent along the bottom of the partition plate 13 and the right side wall of the cabinet body 11 .

[0066] In some embodiments, the first cooling member 22 is located at the bottom of the battery body 21 .

[0067] In some embodiments, the inverter body 41 has a shell, and a working element is disposed inside the shell. The second cooling component 42 is disposed inside the shell so that the second cooling component 42 is close to the working element to improve cooling efficiency.

[0068] The working elements may include but are not limited to power devices, inductors, transformers and control boards.

[0069] In some embodiments, two avoidance holes are provided on the housing, and one of the two avoidance holes allows the second sub-liquid outlet 422 to pass through, and the other allows the second sub-liquid inlet 421 to pass through.

[0070] In some embodiments, the liquid cooling unit 30 is disposed between the energy storage inverter 40 and the battery pack 20.

[0071] Exemplarily, the energy storage inverter 40 is located below the liquid cooling unit 30, and the battery pack 20 is located above the liquid cooling unit 30.

[0072] In the embodiments of the present application, the flow directions of the cooling medium in the first circuit and the second circuit are opposite. The first pipeline 61 and the second pipeline 62 transport the cooling medium in the first circuit upward, and the third pipeline 63 and the fourth pipeline 64 transport the cooling medium in the second circuit downward, which helps to reduce the risk of pipeline interference and the layout difficulty of each pipeline.

[0073] In some embodiments, the diameter of the third pipeline 63 is smaller than the diameters of the first pipeline 61 and the second pipeline 62.

[0074] In some embodiments, the diameter of the fourth pipeline 64 is smaller than the diameters of the first pipeline 61 and the second pipeline 62.

[0075] It can be understood that, compared with the diameters of the first pipeline 61 and the second pipeline 62, the diameters of the third pipeline 63 and the fourth pipeline 64 can be smaller. Compared with the diameters of the third pipeline 63 and the fourth pipeline 64, the diameters of the first pipeline 61 and the second pipeline 62 can be larger.

[0076] Since there are many battery packs 20 in the battery cluster, the heat exchange energy consumption required by the multiple battery packs 20 is large, while the heat exchange energy consumption required by the energy storage inverter 40 is small. Therefore, the third pipeline 63 and the fourth pipeline 64 are smaller, which can save energy, and the diameters of the first pipeline 61 and the second pipeline 62 are larger, which can meet the heat exchange requirements of the battery pack 20 and improve the thermal management effect of the energy storage device 100.

[0077] Refer to Figure 4, in some embodiments, the third pipeline 63 includes a first pipe section 631 and a second pipe section 632. One end of the first pipe section 631 is connected to the second liquid inlet 33 through an elbow, and the other end is connected to the second pipe section 632. One end of the second pipe section 632 is connected to the first pipe section 631, and the other end is connected to the second sub-liquid outlet 422 through an elbow. The fourth pipeline 64 includes a third pipe section 641 and a fourth pipe section 642 connected to each other. One end of the third pipe section 641 is connected to the second liquid outlet 34 through an elbow, and the other end is connected to the fourth pipe section 642. One end of the fourth pipe section 642 is connected to the third pipe section 641, and the other end is connected to the second sub-liquid inlet 421 through an elbow. The first pipe section 631 extends horizontally, the second pipe section 632 extends vertically, the third pipe section 641 extends horizontally, and the fourth pipe section 642 extends vertically. The first pipe section 631 and the third pipe section 641 are arranged side by side, and the second pipe section 632 and the fourth pipe section 642 are arranged side by side. Such an arrangement helps to optimize the layout of the pipeline, reduce the risk of the pipeline contacting other wire harnesses, and further reduce the risk of short circuit of the wire harness caused by coolant leakage in the pipeline.

[0078] Referring to Figure 4 , in some embodiments, the second pipeline 62 includes a fifth pipe section 621 and a sixth pipe section 622 connected to each other. The fifth pipe section 621 is connected to the first sub-liquid outlet 222 of the first cooling component 22. One end of the sixth pipe section 622 is connected to the fifth pipe section 621, and the other end communicates with the first liquid inlet 31. The fifth pipe section 621 extends vertically, and the sixth pipe section 622, the first pipe section 631, and the third pipe section 641 are arranged side by side and all extend horizontally. Such an arrangement can further reduce the risk of the pipeline contacting other wire harnesses, and further reduce the risk of short circuit of the wire harness caused by coolant leakage in the pipeline.

[0079] In some embodiments, the energy storage device 100 further includes a plurality of first pressure relief components 50. The first pressure relief components 50 are disposed in the cabinet 10 and are configured to relieve the pressure in the battery compartment 111 when the temperature or pressure in the battery compartment 111 reaches a first threshold.

[0080] It can be understood that the first pressure relief component 50 has a pressure relief channel inside. When the pressure relief channel is opened, the battery compartment 111 communicates with the outside of the cabinet 10. When the pressure relief channel is closed, the battery compartment 111 is isolated from the outside of the cabinet 10.

[0081] In some embodiments, the first pressure relief component 50 includes a valve body, a valve seat, and a valve flap. The valve body is installed on the cabinet door 12. The valve seat is connected to the valve body. The valve seat has a pressure relief channel. The valve flap is disposed in the pressure relief channel and is configured to open the pressure relief channel when the temperature or pressure in the battery compartment 111 reaches a first threshold.

[0082] In some embodiments, the energy storage device 100 further includes a battery management controller (BMS). The first pressure relief component 50 is signal-connected to the battery management controller.

[0083] In some embodiments, the energy storage device 100 further includes a sensor, which is connected to the battery management controller by signal. The sensor is a temperature or pressure sensor, which is configured to detect the temperature or pressure in the battery compartment 111 and send the detected temperature or pressure signal to the battery management controller, and the battery management controller is configured to control the first pressure relief component 50 to open the internal pressure relief channel based on the temperature or pressure signal detected by the sensor and when the temperature or pressure signal reaches a first threshold.

[0084] In other embodiments, the sensor is a gas sensor, which is configured to detect toxic and harmful gases or flammable gases in the battery compartment 111 and send the detected gas signal back to the battery management controller. The battery management controller is configured to control the first pressure relief component 50 to open the internal pressure relief channel based on the gas signal detected by the sensor when the gas concentration reaches a threshold.

[0085] The gas may include, but is not limited to, hydrogen, carbon monoxide, carbon dioxide, and the like.

[0086] In some embodiments, the battery body 21 is provided with a second pressure relief component 23, and the second pressure relief component 23 is configured to discharge the exhaust in the battery body 21 when the temperature or pressure in the battery body 21 reaches a second threshold. The cabinet 10 has a first wall facing the second pressure relief component 23 and a second wall facing away from the second pressure relief component 23, the first wall is provided with at least one first pressure relief component 50, the second wall is provided with at least one first pressure relief component 50, and the number of the first pressure relief components 50 provided on the first wall is greater than the number of the first pressure relief components 50 provided on the second wall.

[0087] In some embodiments, the first wall is the cabinet door 12, the second wall is the wall opposite to the cabinet door 12, two first pressure relief components 50 are arranged on the first wall, and one first pressure relief component 50 is arranged on the second wall.

[0088] In some embodiments, the second pressure relief component 23 is an explosion-proof plate or a notch provided on the end cover of the battery body 21 .

[0089] It can be understood that the number of the first pressure relief components 50 on the first wall is greater than the number of the first pressure relief components 50 provided on the second wall.

[0090] It can be understood that when the battery pack 20 has thermal runaway, the second pressure relief component 23 on the battery body 21 first opens the valve to release pressure to relieve the temperature and pressure inside the battery pack 20. After the pressure in the battery compartment 111 increases, the first pressure relief component 50 on the cabinet 10 opens the valve to release pressure to reduce the temperature and pressure in the cabinet 10, thereby avoiding a serious accident caused by an explosion due to excessive temperature or pressure in the cabinet 10.

[0091] Since the first wall is close to the second pressure relief component 23, the emissions from the battery body 21 are first discharged around the first wall, resulting in a higher temperature or pressure around the first wall than around the second wall. In the embodiments of the present application, by making the number of the first pressure relief components 50 on the first wall more than the number of the first pressure relief components 50 provided on the second wall, the number of the first pressure relief components 50 on the first wall is larger, which helps to relieve the pressure and temperature around the first wall in a timely manner. Also, the number of the first pressure relief components 50 on the second wall is smaller, which helps to reduce the usage amount of the first pressure relief components 50 and save the manufacturing cost.

[0092] In some embodiments, a heat insulation layer 116 is provided inside the side wall of the cabinet body 11.

[0093] Exemplarily, heat insulation layers 116 are provided inside the left side wall and the right side wall of the cabinet body 11.

[0094] In a low temperature environment, the electrochemical reaction of the battery pack 20 will slow down due to the low temperature, resulting in a decrease in energy output, a slower charging speed, and a shorter cruising range. In a low temperature environment, the performance of the working elements inside the energy storage inverter 40 will decline, resulting in a reduction in efficiency.

[0095] In the embodiments of the present application, by providing the heat insulation layer 116, the heat transfer between the inside and outside of the cabinet body 10 is reduced, the influence of the external low temperature environment on the internal temperature of the cabinet body 10 is reduced, which helps to extend the service life of the battery pack 20 and the energy storage inverter 40.

[0096] In some embodiments, the base material of the heat insulation layer 116 is rock wool. The heat insulation layer 116 prepared from rock wool material not only has excellent heat insulation performance, but also has the characteristics of high melting point and incombustibility, which helps to prevent the spread of fire when the battery pack 20 is out of control, thereby improving the reliability of the energy storage device 100.

[0097] Refer to Figure 9 , in some embodiments, a metal frame 113 is further provided inside the side wall of the cabinet body 11, which helps to improve the structural strength of the cabinet body 10.

[0098] In some embodiments, the metal frame 113 is welded by galvanized rectangular pipes.

[0099] In some embodiments, the metal frame 113 has a hollow cavity 1131, and the heat insulation layer 116 is arranged in the hollow cavity 1131. With this arrangement, the metal frame 113 can fix the heat insulation layer 116 and improve the installation stability of the heat insulation layer 116.

[0100] Refer to Figure 9, in some embodiments, the side wall of the cabinet body 11 includes a first body and a second plate 115. The first plate 114 is located on the outer side, the second plate 115 is located on the inner side, and the metal frame 113 is located between the first plate 114 and the second plate 115.

[0101] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0102] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0103] The embodiments, implementation manners and related technical features of the present application can be combined and replaced with each other without conflict.

[0104] The above are only the preferred embodiments of the present application and do not impose any form of limitation on the present application. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. An energy storage device, characterized in that, Including: A battery pack, including a battery body and a first cooling component, the first cooling component being configured to regulate the temperature of the battery body; A energy storage inverter, including an inverter body and a second cooling component, the second cooling component being configured to regulate the temperature of the inverter body; A liquid cooling unit, connected to the first cooling component to form a first cooling loop and connected to the second cooling component to form a second cooling loop, the first cooling loop and the second cooling loop being independent of each other.

2. The energy storage device according to claim 1, characterized in that, A plurality of the battery packs are provided, and the plurality of battery packs are arranged along the height direction of the energy storage device, and the first cooling components of the plurality of battery packs are connected in parallel to the first cooling loop.

3. The energy storage device according to claim 2, characterized in that, The liquid cooling unit has a first liquid inlet and a first liquid outlet, the first cooling component has a first sub-liquid inlet and a first sub-liquid outlet, the first liquid outlet is connected to the first sub-liquid inlet through a first pipeline, and the first liquid inlet is connected to the first sub-liquid outlet through a second pipeline.

4. The energy storage device according to claim 3, characterized in that, The liquid cooling unit has a first surface, and the first liquid inlet and the first liquid outlet are both arranged on the first surface and on the same side in the width direction of the energy storage device.

5. The energy storage device according to claim 3, characterized in that, The liquid cooling unit has a second liquid inlet and a second liquid outlet, the second cooling component has a second sub-liquid inlet and a second sub-liquid outlet, the second liquid outlet is connected to the second sub-liquid inlet through a third pipeline, and the second liquid inlet is connected to the second sub-liquid outlet through a fourth pipeline.

6. The energy storage device according to claim 5, characterized in that, The liquid cooling unit has a first surface, and the second liquid inlet and the second liquid outlet are both arranged on the first surface and on the same side in the width direction of the energy storage device.

7. The energy storage device according to claim 5, wherein The diameter of the third pipeline is smaller than the diameters of the first pipeline and the second pipeline; And / or The diameter of the fourth pipeline is smaller than the diameters of the first pipeline and the second pipeline.

8. The energy storage device according to claim 5, characterized in that The third pipeline includes a first pipe section and a second pipe section, one end of the first pipe section communicates with the second liquid inlet, the other end is connected to the second pipe section, and the end of the second pipe section away from the first pipe section communicates with the second sub-liquid outlet; The fourth pipeline includes a third pipe section and a fourth pipe section connected to each other, one end of the third pipe section communicates with the second liquid outlet, the other end is connected to the fourth pipe section, and the end of the fourth pipe section away from the third pipe section communicates with the second sub-liquid inlet; Wherein, the first pipe section and the third pipe section are arranged side by side and both extend horizontally, and the second pipe section and the fourth pipe section are designed side by side and both extend vertically.

9. The energy storage device according to any one of claims 1-8, characterized in that, The inverter body includes a housing, and the second cooling component is arranged inside the housing.

10. The energy storage device according to any one of claims 1-8, characterized in that, The liquid cooling unit is arranged between the energy storage inverter and the battery pack.

11. The energy storage device according to any one of claims 1-8, characterized in that, The energy storage device further includes a cabinet body, the cabinet body has a battery compartment and an electrical compartment, the battery pack is arranged in the battery compartment, and the liquid cooling unit and the energy storage inverter are arranged in the electrical compartment.

12. The energy storage device according to claim 11, wherein, The electrical compartment is arranged at the bottom of the battery compartment.

13. The energy storage device according to claim 11, wherein, The energy storage device further includes: A plurality of first pressure relief components, arranged on the cabinet body and configured to release the pressure in the battery compartment when the temperature or pressure in the battery compartment reaches a first threshold.

14. The energy storage device according to claim 13, wherein The battery body is provided with a second pressure relief component, and the second pressure relief component is configured to release the exhaust in the battery body when the temperature or pressure in the battery body reaches a second threshold; and / or, The cabinet has a first wall facing the second pressure relief component and a second wall away from the second pressure relief component, the first wall is provided with at least one first pressure relief component, the second wall is provided with at least one first pressure relief component, and the number of the first pressure relief components provided on the first wall is greater than the number of the first pressure relief components provided on the second wall.

15. The energy storage device according to any one of claims 1-8, characterized in that, The energy storage device also includes a cabinet, which includes a cabinet body and a cabinet door. The cabinet body has an operation port, and the operation port is used for placing the battery pack, the energy storage inverter, and the liquid cooling unit in the cabinet body. The cabinet door is used to open and close the operation port, and a heat insulation layer is arranged in the side wall of the cabinet body.

16. The energy storage device according to claim 15, wherein, A metal frame is also arranged inside the side wall of the cabinet body.

17. The energy storage device according to claim 16, wherein, The metal frame has a hollow cavity, and the heat insulation layer is arranged in the hollow cavity.

Images