Energy storage device and energy storage system

Abstract

Disclosed in the present application are an energy storage device and an energy storage system. The energy storage device comprises a case and a battery module, wherein the case has a length direction and is provided with a mounting space therein; and the battery module comprises a plurality of battery cells and a liquid cooling structure, which are located in the mounting space, the liquid cooling structure being connected to the case and having a first side face and a second side face which are opposite each other in the length direction, at least one battery cell being arranged on the first side face, and at least one other battery cell being arranged on the second side face.

Description

Energy storage device and energy storage system

[0001] Related Cross-Reference

[0002] The present application claims priority to the Chinese patent application No. 2024106419493, filed on May 23, 2024, entitled "Energy storage device and energy storage system", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of energy storage, in particular to an energy storage device and an energy storage system. BACKGROUND

[0004] In the related art, an energy storage prefabricated cabin is mainly composed of battery modules, the modules are integrated into battery packs, and the battery packs are integrated into battery clusters. The intermediate process is accompanied by a large number of structural components, such as limiting components, wiring harness devices, etc. for fixing between battery packs and between battery clusters. These structural components are relatively complex and occupy a large part of the space, resulting in low utilization of the installation space in the energy storage prefabricated cabin, reducing the number of batteries, and thus leading to low energy density of the energy storage prefabricated cabin and less power storage. SUMMARY

[0005] The embodiments of the present application disclose an energy storage device and an energy storage system, which can improve the installation space utilization of the energy storage device, increase the number of single batteries, and thus improve the energy density of the energy storage device and store more power.

[0006] To achieve the above-mentioned purpose, the first aspect of the present application discloses an energy storage device, comprising:

[0007] a box body having a length direction, the box body being provided with an installation space; and

[0008] a battery module comprising a liquid cooling structure and a plurality of single batteries in the installation space, the liquid cooling structure being connected with the box body, and the liquid cooling structure having a first side face and a second side face opposite along the length direction, at least one single battery being arranged on the first side face, and at least another single battery being arranged on the second side face.

[0009] In the energy storage device provided in the application, by directly installing the single battery on the liquid cooling structure and directly forming the battery cluster, the integration process of the module and the battery pack in the intermediate process is omitted, the integration of the energy storage device is improved, the structural members such as the module frame, the battery pack shell, the battery frame, the limiting assembly and the wiring harness device are saved, and the number of structural members is greatly reduced. On the one hand, the installation space utilization rate in the energy storage device can be improved, the number of single batteries can be increased, the energy density of the energy storage device can be improved, more electric energy can be stored, and the endurance is higher. On the other hand, the production cost of the energy storage device is reduced, the assembly process is reduced, and the production speed of the energy storage device is improved.

[0010] At the same time, since the plurality of single batteries are directly arranged on the liquid cooling structure, the liquid cooling structure can be used for two purposes, that is, the plurality of single batteries can be assembled in the box by the liquid cooling structure, the module frame and the battery frame are omitted, the installation space utilization rate of the energy storage device can be improved, the number of single batteries can be increased, and the energy density of the energy storage device can be improved. At the same time, the surface of the liquid cooling structure in contact with the single battery can take away the heat generated by the single battery, so that the temperature of the single battery can be reduced, the single battery can be prevented from running in a high-temperature environment all the time, and the use safety of the energy storage device can be improved.

[0011] The second aspect of the application discloses an energy storage system having the energy storage device as described in the first aspect. The energy storage system having the energy storage device as described in the first aspect can also improve the installation space utilization rate of the energy storage device, increase the number of single batteries, and thus improve the energy density of the energy storage device and store more electric energy.

[0012] Compared with the prior art, the application has the following beneficial effects:

[0013] The energy storage device and the energy storage system provided in the embodiments of the application directly install the single battery on the liquid cooling structure and directly form the battery cluster, omit the integration process of the module and the battery pack in the intermediate process, improve the integration of the energy storage device, save the structural members such as the module frame, the battery pack shell, the battery frame, the limiting assembly and the wiring harness device, greatly reduce the number of structural members, on the one hand, the installation space utilization rate in the energy storage device can be improved, the number of single batteries can be increased, the energy density of the energy storage device can be improved, more electric energy can be stored, and the endurance is higher. On the other hand, the production cost of the energy storage device is reduced, the assembly process is reduced, and the production speed of the energy storage device is improved.

[0014] Meanwhile, since the plurality of single batteries are directly arranged on the liquid cooling structure, the liquid cooling structure can be used for two purposes, that is, the plurality of single batteries can be assembled in the box by the liquid cooling structure, and the module frame, the battery frame and the like are omitted, so that the installation space utilization rate of the energy storage device can be improved, the number of single batteries can be increased, and the energy density of the energy storage device can be improved; meanwhile, the surface of the liquid cooling structure in contact with the single battery can take away the heat generated by the single battery, so that the temperature of the single battery can be reduced, the single battery can be prevented from running in a high temperature environment all the time, and the use safety of the energy storage device can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] FIG. 1 is a structural schematic diagram of an energy storage device disclosed by an embodiment of the present application;

[0017] FIG. 2 is an exploded structural schematic diagram of the energy storage device disclosed by the embodiment of the present application;

[0018] FIG. 3 is a structural schematic diagram of a plurality of battery modules arranged along a length direction disclosed by the embodiment of the present application;

[0019] FIG. 4 is a structural schematic diagram of a battery module disclosed by the embodiment of the present application;

[0020] FIG. 5 is an exploded structural schematic diagram of the battery module disclosed by the embodiment of the present application;

[0021] FIG. 6 is a structural schematic diagram of a liquid cooling structure disclosed by the embodiment of the present application;

[0022] FIG. 7 is a first exploded structural schematic diagram of a box disclosed by the embodiment of the present application;

[0023] FIG. 8 is a partial enlarged view of M in FIG. 7;

[0024] FIG. 9 is a structural schematic diagram of a first liquid cooling plate, a bottom cross beam, a bottom plate and a longitudinal reinforcing beam disclosed by the embodiment of the present application;

[0025] FIG. 10 is a partial enlarged view of N in FIG. 9;

[0026] FIG. 11 is an exploded structural schematic diagram of the box from another perspective disclosed by the embodiment of the present application;

[0027] FIG. 12 is a partial enlarged view of O in FIG. 11;

[0028] FIG. 13 is an exploded structural schematic view of the box from another perspective according to an embodiment of the present application.

[0029] Main reference signs 100 - energy storage device; 1 - box; 1a - mounting space; 1b - connecting hole; 11 - frame; 111 - longitudinal beam; 112 - cross beam; 112a - bottom cross beam; 112b - top cross beam; 113 - bottom reinforcing beam; 1131 - sub-reinforcing beam; 114 - connecting beam; 1141 - hollow part; 115 - longitudinal reinforcing beam; 116 - top reinforcing beam; 12 - cover plate; 121 - bottom plate; 1211 - first plate body; 1211a - first sub-plate body; 1212 - second plate body; 1212a - second sub-plate body; 1213 - bottom plate body; 1212b - connecting plate; 122 - top plate; 1221 - third plate body; 1222 - fourth plate body; 1222a - top plate body; 1223 - partition strip; 13 - receiving plate; 2 - battery module; 21 - liquid cooling structure; 211 - first liquid cooling plate; 2111 - first part; 2112 - second part; 2113 - through hole; 212 - second liquid cooling plate; 2121 - first side face; 2122 - second side face; 22 - single battery cell; 221 - first sub-battery cell; 222 - second sub-battery cell; f1 - length direction; f2 - width direction; f3 - height direction; A - first gap; B - second gap; C - third gap. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing specific embodiments only and is not intended to be limiting of the present application.

[0032] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first sub-beam line can be referred to as the second sub-beam line, and similarly, the second sub-beam line can be referred to as the first sub-beam line. The first sub-beam line and the second sub-beam line are both sub-beam lines, but they are not the same sub-beam line.

[0033] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0034] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0035] As mentioned in the background section, in the related energy storage prefabricated cabin, multiple individual batteries are first assembled on a module frame to form a battery module, then installed inside the casing to form a battery pack. Next, multiple battery packs are assembled on the battery frame to form a battery cluster, and finally installed inside the cabin. This process involves a large number of structural components. For example, the battery packs and battery clusters are fixed together using limiting components, wiring harnesses, and other structural components. These structural components are quite complex and occupy a large portion of the installation space inside the cabin. At the same time, the battery frame also occupies a large portion of the installation space inside the cabin, and the module frame occupies a large portion of the installation space inside the casing. This reduces the utilization rate of the installation space inside the cabin and the installation space inside the casing, thereby reducing the number of individual batteries, affecting the energy density of the energy storage prefabricated cabin, and resulting in less energy storage.

[0036] Therefore, there is a need for an energy storage device and system that can improve the utilization of installation space, thereby increasing energy density and storing more electricity.

[0037] The technical solution of this application will be further described in detail below with reference to the accompanying drawings.

[0038] Referring to FIG. 1 and FIG. 2, the embodiment of the first aspect of the present application discloses a kind of energy storage devices, which can be used as traditional standard 20 feet energy storage prefabricated cabin, non-standard prefabricated cabin or outdoor cabinet.The energy storage device 100 includes box 1 and battery module 2, box 1 is provided with installation space 1a, and battery module 2 is arranged in installation space 1a.Wherein, battery module 2 is used for charging and discharging, realizes the storage of electric quantity and power supply for other equipment.Box 1 is used to fix and protect battery module 2 and other electronic devices or structures arranged in the inside of box 1, and can form sealing effect to battery module 2 and other electronic devices or structures arranged in the inside of box 1, to avoid the erosion of external moisture, dust and other impurities to the electronic devices or structures arranged in the inside of box 1.

[0039] In order to facilitate stacking, transportation, the energy storage device 100 in the present application is mostly square energy storage device, such as square energy storage device or rectangular energy storage device, then the shape of box 1 is mostly square or rectangular.

[0040] Exemplarily, the shape of the box 1 is rectangular, which has length direction f1, width direction f2 and height direction f3. Alternatively, as shown in FIG. 1 and FIG. 2, the length direction f1 can be the x-axis direction in the three-dimensional coordinate system, the width direction f2 can be the y-axis direction in the three-dimensional plane coordinate system, and the height direction f3 can be the z-axis direction in the three-dimensional coordinate system.

[0041] Referring to FIG. 2 to FIG. 5, the battery module 2 provided by the embodiment of the present application can include a liquid cooling structure 21 and a plurality of single batteries 22 located in the installation space 1a. The liquid cooling structure 21 is connected with the box 1, and the liquid cooling structure 21 has a first side surface 2121 and a second side surface 2122 opposite to each other along the length direction f1. At least one single battery 22 is arranged on the first side surface 2121, and at least another single battery 22 is arranged on the second side surface 2122. In this way, the plurality of single batteries 22 are directly arranged on the liquid cooling structure 21, which can realize the dual-purpose of the liquid cooling structure 21, that is, the plurality of single batteries 22 can be assembled in the box 1 through the liquid cooling structure 21, without module frame, battery frame, etc., thereby improving the installation space utilization rate of the energy storage device 100, increasing the number of single batteries 22, and further improving the energy density of the energy storage device 100. At the same time, the surface of the liquid cooling structure 21 in contact with the single batteries 22 can also carry away the heat generated by the single batteries 22, thereby reducing the temperature of the single batteries 22, avoiding the single batteries 22 running in high-temperature environment all the time, and improving the use safety of the energy storage device 100.

[0042] The energy storage device 100 provided by the embodiments of the present application has a plurality of single batteries 22 directly mounted on the liquid cooling structure 21 in the energy storage device 100, and thus the battery frame is omitted, and the energy storage device 100 is also called a battery frame-free energy storage device 100. Since the plurality of single batteries 22 are directly mounted on the liquid cooling structure 21 to form a battery cluster, the integration process of the module and the battery pack is omitted, the integration of the energy storage device 100 is improved, the structural components such as the module frame, the battery pack shell, the battery frame, the limiting assembly, and the wiring harness device are saved, and the number of structural components is greatly reduced. On the one hand, since the module frame and the battery frame are not needed, the single batteries 22 can be more closely arranged in the box body 1 of the energy storage device 100, the utilization rate of the installation space in the energy storage device 100 can be further improved, the number of single batteries 22 can be increased, and thus the energy density of the energy storage device 100 can be improved, and more electric energy can be stored. For example, the energy density of a single energy storage device 100 can reach 470kwh / m 2 to 590kwh / m 2 , which is not equal to, has higher endurance; on the other hand, it is beneficial to reduce the production cost of the energy storage device 100 and reduce the assembly process, and is beneficial to improve the production speed of the energy storage device 100.

[0043] Optionally, as shown in FIGS. 2 and 3, the battery module 2 is a plurality of battery modules 2, and the plurality of battery modules 2 are arranged along the length direction f1 to ensure that the energy storage device 100 has enough single batteries 22, so that the energy storage device 100 can store enough electric energy.

[0044] In some optional embodiments, as shown in FIGS. 4 and 5, for each battery module 2, the single batteries 22 arranged on the first side surface 2121 can include a plurality of first sub-batteries 221 arranged in a matrix stack along the height direction f3 and the width direction f2; and the single batteries 22 arranged on the second side surface 2122 include a plurality of second sub-batteries 222 arranged in a matrix stack along the height direction f3 and the width direction f2. Through the above design, the energy storage device 100 can have more single batteries 22, so that the energy storage device 100 can store more electric energy; at the same time, since there is no bearing plate between the adjacent two single batteries 22 along the height direction f3, the battery frame-free design can be realized while the plurality of single batteries 22 are arranged in a stack along the height direction f3 to ensure that the energy storage device 100 has more single batteries 22, so that the utilization rate of the installation space in the energy storage device 100 can be further improved, the number of single batteries 22 can be further increased, and thus the energy density of the energy storage device 100 can be further improved, and more electric energy can be stored, and the energy storage device 100 has higher endurance.

[0045] In addition, it can be understood that if the plurality of battery modules 2 are arranged along the width direction f2, the first sub-battery 221 and the second sub-battery 222 are arranged in a matrix along the height direction f3 and the length direction f1 respectively. Since the length of the box body 1 along the length direction f1 is usually greater than the width of the box body 1 along the width direction f2, the length of the liquid cooling structure 21 along the length direction f1 is usually greater than the width of the liquid cooling structure 21 along the width direction f2. Therefore, when the energy storage device 100 has the same number of single batteries 22, the plurality of battery modules 2 are arranged along the length direction f1, and compared with the arrangement of the plurality of battery modules 2 along the width direction f2, the number of single batteries 22 arranged on each liquid cooling structure 21 can be smaller, which can reduce the load requirement of the liquid cooling structure 21 and help to ensure the stability of the single battery 22 in the box body 1.

[0046] In the present application, the liquid cooling structure 21 can be provided with a liquid cooling flow channel, and the liquid cooling structure 21 is further provided with a liquid inlet and a liquid outlet which are in communication with the liquid cooling flow channel, so that the cooling liquid can flow into the liquid cooling flow channel through the liquid inlet and flow out of the liquid cooling flow channel through the liquid outlet, and the cooling liquid in the liquid cooling flow channel can continuously flow. In this process, the cooling liquid in the liquid cooling flow channel can take away the heat generated by the single battery 22 through the surface of the liquid cooling structure 21 in contact with the single battery 22, so as to reduce the temperature of the single battery 22 and avoid the single battery 22 running in a high-temperature environment, thereby improving the use safety of the energy storage device 100.

[0047] In some optional embodiments, the first sub-battery 221 can be connected to the first side surface 2121 by a heat-conducting adhesive (not shown), and the second sub-battery 222 can be connected to the second side surface 2122 by a heat-conducting adhesive (not shown). Since the cooling plate is placed between the first sub-battery 221 and the second sub-battery 222, and the two side surfaces (i.e. the first side surface 2121 and the second side surface 2122) of the liquid cooling structure 21 are adhered to the first sub-battery 221 and the second sub-battery 222 respectively by the heat-conducting adhesive, the first sub-battery 221 and the second sub-battery 222 can be installed closely to the liquid cooling structure 21, thereby increasing the heat dissipation area and improving the heat dissipation effect. At the same time, in addition to the good heat conduction of the heat-conducting adhesive to improve the heat dissipation effect, the good adhesion of the heat-conducting adhesive can also make the first sub-battery 221 and the second sub-battery 222 adhere to the liquid cooling structure 21, which is conducive to improving the rigidity of the battery module 2 as a whole, thereby improving the safety of the energy storage device 100 during transportation and vibration. At the same time, it is not necessary to additionally provide a limiting member or a fixing member to fix the single battery 22 to the liquid cooling structure 21, so as to further improve the utilization rate of the installation space in the energy storage device 100, further increase the number of single batteries 22, and further improve the energy density of the energy storage device 100.

[0048] In other words, by arranging the heat-conducting adhesive on the side of the liquid cooling structure 21, the heat-conducting adhesive can not only bond the single battery 22 so that the single battery 22 is fixed relative to the liquid cooling structure 21, but also play a role in fixing the electric core, without the need for additional limiting members or fixing members to fix the single battery 22 on the liquid cooling structure 21, thereby further improving the utilization rate of the installation space in the energy storage device 100, further increasing the number of single batteries 22, and further improving the energy density of the energy storage device 100. At the same time, the heat-conducting adhesive can also reduce the air gap between the liquid cooling structure 21 and the single battery 22, provide better heat conduction performance, so that the cooling liquid in the liquid cooling structure 21 can better take away the heat of the single battery 22, strengthen the heat dissipation of the single battery 22, and have a better heat dissipation effect.

[0049] In some embodiments, as shown in FIGS. 2-6, the liquid cooling structure 21 includes a first liquid cooling plate 211 and a second liquid cooling plate 212. The first liquid cooling plate 211 is connected to the box body 1 and located at the bottom of the installation space 1a, i.e., the first liquid cooling plate 211 is connected to the inner bottom surface of the box body 1. The second liquid cooling plate 212 is connected to the first liquid cooling plate 211 at an angle, for example, the angle between the second liquid cooling plate 212 and the first liquid cooling plate 211 can be 90°. Of course, in other embodiments, the angle between the second liquid cooling plate 212 and the first liquid cooling plate 211 can also be 89°, 89.5°, 90.5°, or 91°, etc. The second liquid cooling plate 212 has the first side surface 2121 and the second side surface 2122 described above, i.e., the single battery 22 is connected to the side surface of the second liquid cooling plate 212. The first liquid cooling plate 211 has a first portion 2111 located at the first side surface 2121 and a second portion 2112 located at the second side surface 2122, i.e., the second liquid cooling plate 212 is divided into the first portion 2111 and the second portion 2112 by the first liquid cooling plate 211 as a boundary line. The single battery 22 arranged at the first side surface 2121 is arranged on the first portion 2111, and the single battery 22 arranged at the second side surface 2122 is arranged on the second portion 2112, i.e., at least one first sub-battery 221 is arranged on the first portion 2111, and at least one second sub-battery 222 is arranged on the second portion 2112.

[0050] By designing the liquid cooling structure 21 as a structure including the first liquid cooling plate 211 and the second liquid cooling plate 212 arranged at an angle, on the one hand, the single battery 22 can be cooled by the first liquid cooling plate 211 and the second liquid cooling plate 212; on the other hand, the single battery 22 can be supported by the second liquid cooling plate 212, so as to avoid the single battery 22 being suspended, thereby improving the stability of the single battery 22 on the liquid cooling structure 21, and thus being conducive to improving the safety of the single battery 22 during transportation and vibration, and at the same time, the single battery 22 can avoid being in direct contact with the box body 1, so as to reduce or avoid the temperature outside the box body 1 being conducted to the single battery 22 through the box body 1 in the opposite direction, thereby being conducive to improving the liquid cooling effect.

[0051] In some embodiments, as shown in FIGS. 6, 7 and 8, the inner bottom surface of the box body 1 is provided with a connecting hole 1b, and the first liquid cooling plate 211 is provided with a through hole 2113 for the fastener to pass through, so that the fastener can be threadedly connected with the connecting hole 1b, thereby achieving the fixed installation of the first liquid cooling plate 211 on the box body 1, and achieving the installation and fixation of the liquid cooling structure 21 and the single battery 22 in the box body 1. The fastener can be a bolt or a screw, etc. By using the bolt or the screw to achieve the installation and fixation of the battery module 2, the installation method is relatively simple, and the assembly of the energy storage device 100 is facilitated; at the same time, the threaded connection can make the connection between the first liquid cooling plate 211 and the box body 1 more reliable and stable, thereby being conducive to improving the installation stability of the battery module 2 in the box body 1, and thus being conducive to improving the safety of the energy storage device 100 during transportation and vibration.

[0052] Alternatively, the through hole 2113 can be multiple, and the multiple through holes 2113 are arranged at intervals along the length direction f1, and part of the through holes 2113 can be located in the first portion 2111, and the other part of the through holes 2113 can be located in the second portion 2112. For example, as shown in FIG. 6, the through hole 2113 is two, one of which is located in the first portion 2111, and the other is located in the second portion 2112. Correspondingly, the connecting hole 1b is multiple, one connecting hole 1b is arranged corresponding to one through hole 2113, and the fastener is also multiple, one fastener passes through one through hole 2113 and connects with one connecting hole 1b, so as to connect the first liquid cooling plate 211 and the box body 1. By using multiple fasteners to connect the first liquid cooling plate 211 and the box body 1, the stability of the connection between the first liquid cooling plate 211 and the box body 1 can be further improved.

[0053] In some optional embodiments, the box 1 can include a box body and a bottom plate connected to each other, the bottom plate covers the bottom opening of the box body, and the mounting space 1a described above is formed between the bottom plate and the box body to accommodate the battery module 2. In some other optional embodiments, the box 1 can include a box body and a top plate connected to each other, the top plate covers the top opening of the box body along the height direction f3 of the box 1, and the mounting space 1a described above is formed between the top plate and the box body to accommodate the battery module 2. In some other optional embodiments, as shown in FIG. 7, the box 1 can include a frame 11 and a plurality of cover plates 12, the frame 11 includes a plurality of longitudinal beams 111 and a plurality of transverse beams 112, the plurality of longitudinal beams 111 are arranged at intervals along the circumferential direction of the box 1, and two transverse beams 112 arranged at intervals are connected between any two adjacent longitudinal beams 111, each cover plate 12 is connected between two adjacent longitudinal beams 111 and connected between two adjacent transverse beams 112 to enclose the mounting space 1a described above to accommodate the battery module 2.

[0054] Preferably, the box 1 of the present application adopts the structure including the frame 11 and the plurality of cover plates 12, compared with the structure including the box body and the bottom plate or the structure including the box body and the top plate, since the box 1 of the present application is generally larger, the box body is also generally larger, it is difficult to process the integral box body, resulting in that the processing difficulty of the box 1 is relatively large, and the box 1 is formed by splicing the plurality of longitudinal beams 111, the plurality of transverse beams 112 and the plurality of cover plates 12, the longitudinal beams 111, the transverse beams 112 and the cover plates 12 are easier to process than the integral box body, so that the box 1 of the present application adopts the structure including the frame 11 and the plurality of cover plates 12, which can reduce the processing difficulty of the box 1 and facilitate the processing of the box 1.

[0055] In the following, the technical solutions of the present application will be further described in detail taking the box 1 of the present application adopting the structure including the frame 11 and the plurality of cover plates 12 as an example.

[0056] In the present application, in order to facilitate description and understanding, as shown in FIG. 7, the crossbeam 112 located at the bottom of the box body 1 along the height direction f3 is defined as the bottom crossbeam 112a, the crossbeam 112 located at the top of the box body 1 along the height direction f3 is defined as the top crossbeam 112b, the cover plate 12 located at the bottom of the box body 1 along the height direction f3 is defined as the bottom plate 121, and the cover plate 12 located at the top of the box body 1 along the height direction f3 is defined as the top plate 122; wherein the bottom plate 121 is connected between two adjacent bottom crossbeams 112a, the top plate 122 is connected between two adjacent top crossbeams 112b, and the first liquid cooling plate 211 is connected to the top surface of the bottom crossbeam 112a. Specifically, the top surface of the bottom crossbeam 112a is provided with a connecting hole 1b, and the first liquid cooling plate 211 is provided with a through hole 2113 for the fastener to pass through, so that the fastener can be threadedly connected with the connecting hole 1b, thereby achieving the fixed installation of the first liquid cooling plate 211 on the box body 1, and achieving the installation and fixation of the liquid cooling structure 21 and the single battery 22 in the box body 1.

[0057] It should be understood that the above definitions are only for the convenience of description and understanding, and should not limit the protection scope of the present application.

[0058] In some embodiments, as shown in FIGS. 2 and 7, the frame 11 further comprises a plurality of longitudinal reinforcing beams 115 arranged at intervals, the plurality of longitudinal reinforcing beams 115 abut between the bottom plate 121 and the top plate 122, and adjacent two longitudinal reinforcing beams 115 arranged along the length direction f1 are used to abut the battery module 2 to limit the position of the battery module 2 in the installation space 1a. In this way, the entire device can be supported by the plurality of longitudinally arranged longitudinal reinforcing beams 115, and the adjacent two rows of longitudinal reinforcing beams 115 can be used as limiting beams for the battery module 2 to further limit the position of the battery module 2 in the box body 1, thereby avoiding the random movement and shaking of the battery module 2, and further improving the safety of the energy storage device 100 during transportation and vibration.

[0059] In some optional embodiments, as shown in FIG. 9, along the height direction f3, the top surface of the bottom crossbeam 112a is higher than the top surface of the bottom plate 121, so that a first gap A is formed between the first liquid cooling plate 211 and the top surface of the bottom plate 121. In this way, the first liquid cooling plate 211 can only be in contact with the bottom crossbeam 112a and not in contact with the bottom plate 121, so that the first liquid cooling plate 211 only contacts the outside through the bottom crossbeam 112a, avoiding the first liquid cooling plate 211 also contacting the outside through the bottom plate 121. This can reduce the contact between the liquid cooling structure 21 and the outside, thereby reducing the heat from the outside being conducted to the liquid cooling structure 21 in the opposite direction through the box body 1, and even to the single battery 22, thereby improving the liquid cooling effect.

[0060] In some embodiments, the bottom plate 121 can include a first plate body 1211 and a second plate body 1212, the first plate body 1211 and the second plate body 1212 are spaced apart along the height direction f3, and the first plate body 1211 is closer to the top surface of the bottom cross beam 112a than the second plate body 1212, wherein the top surface of the first plate body 1211 is lower than the top surface of the bottom cross beam 112a along the height direction f3, so that a first gap A is formed between the top surface of the first plate body 1211 and the first liquid cooling plate 211, and the bottom surface of the second plate body 1212 is higher than the bottom surface of the bottom cross beam 112a, so that when the energy storage device 100 of the present application is placed on a placement plane, such as a transportation device or a bearing surface for containing the energy storage device 100, the bottom cross beam 112a is in contact with the placement plane, and the second plate body 1212 can not be in contact with the placement plane. In addition, the second plate body 1212 and the first plate body 1211 are spaced apart, and the first plate body 1211 and the first liquid cooling plate 211 are spaced apart, which can form multiple effects of avoiding the first liquid cooling plate 211 from being in contact with the outside through the bottom plate 121. This can greatly reduce the contact between the liquid cooling structure 21 and the outside, thereby further reducing the heat from the outside being conducted to the liquid cooling structure 21 through the box 1 in the opposite direction, and even to the single battery 22, thereby further improving the liquid cooling effect.

[0061] In some embodiments, the first plate body 1211 includes two first sub-plate bodies 1211a which are spaced apart and arranged along the width direction f2 of the box 1 to form a second gap B, and the second gap B is in communication with the first gap A; and the second plate body 1212 includes two second sub-plate bodies 1212a which are spaced apart and arranged along the width direction f2 of the box 1, and the two second sub-plate bodies 1212a respectively extend along the height direction f3 to form a connecting plate 1212b, the two connecting plates 1212b are connected, and the two connecting plates 1212b are spaced apart from the first sub-plate body 1211a to form a third gap C, and the third gap C is in communication with the first gap A and the gap between the first sub-plate body 1211a and the second sub-plate body 1212a.

[0062] Through the above design, the first gap A can be in communication with the gap between the first sub-plate body 1211a and the second sub-plate body 1212a through the second gap B and the third gap C. Then, the hot air flow on the surface of the first liquid cooling plate 211 located in the first gap A can be conducted to the gap between the first sub-plate body 1211a and the second sub-plate body 1212a through the second gap B and the third gap C in sequence, thereby avoiding being left in the first gap A all the time, and thereby improving the liquid cooling effect of the first liquid cooling plate 211. At the same time, the arrangement of the connecting plate 1212b can increase the connection stability between the two second sub-plate bodies 1212a.

[0063] In some embodiments, as shown in FIGS. 9-11, the bottom plate 121 includes a plurality of bottom plate bodies 1213, the plurality of bottom plate bodies 1213 are arranged at intervals along the length direction f1, and the frame 11 further includes a bottom reinforcing beam 113, the bottom reinforcing beam 113 is connected between two adjacent bottom plate bodies 1213 and connected between two adjacent bottom transverse beams 112a. Each bottom plate body 1213 can include the first plate body 1211 and the second plate body 1212.

[0064] The bottom reinforcing beam 113 can strengthen the structural strength of the frame 11, better protect the battery module 2, and improve the safety of the energy storage device 100 during transportation and vibration. In addition, since the bottom plate 121 includes a plurality of bottom plate bodies 1213, and the bottom reinforcing beam 113 is connected between two adjacent bottom plate bodies 1213, the bottom plate body 1213 is easier to process than a large-area plate, and the bottom reinforcing beam 113 connected between two adjacent bottom plate bodies 1213 can be in contact with the placement plane. Compared with the mode that the bottom reinforcing beam 113 is supported on the top surface of the bottom plate 121, the entire gravity of the bottom reinforcing beam 113 is applied to the bottom plate 121, and the bottom reinforcing beam 113 can support to a certain extent, which can improve the overall stiffness of the box 1, thereby improving the safety of the energy storage device 100 during transportation and vibration.

[0065] In some embodiments, as shown in FIGS. 11 and 12, the bottom reinforcing beam 113 can be a plurality of beams, and the frame 11 further includes a plurality of connecting beams 114, the plurality of connecting beams 114 and the plurality of bottom reinforcing beams 113 are arranged alternately along the length direction f1. Since the battery module includes a plurality of bottom reinforcing beams 113 and a plurality of connecting beams 114, the lateral rigidity and structural strength of the overall frame can be ensured, so that the bottom plate 121 can better withstand the gravity of the battery module with more single batteries, thereby improving the safety of the energy storage device 100 during transportation and vibration.

[0066] For example, the connecting beam 114 can be a beam structure with a hollow portion 1141, and the hollow portion 1141 penetrates the side surface of the connecting beam 114 along the length direction f1. Along the length direction f1, the width of the connecting beam 114 is less than the width of the bottom reinforcing beam 113.

[0067] In some embodiments, the bottom reinforcing beam 113 includes two sub-reinforcing beams 1131 arranged separately, the two sub-reinforcing beams 1131 are arranged at intervals along the width direction f2 of the box body 1, and the box body 1 further includes a receiving plate 13, the receiving plate 13 is connected to the bottom surface of the two sub-reinforcing beams 1131 respectively, and the bottom surface of the receiving plate 13 is flush with the bottom surface of the bottom cross beam 112a. Since the length of the conventional and ordinary reinforcing beam along the width direction of the box body is usually small, for example, less than 2 meters, two sub-reinforcing beams 1131 are used to form the bottom reinforcing beam 113 by splicing through the receiving plate 13 to meet the length requirement of the bottom reinforcing beam 113, without the need to customize a bottom reinforcing beam 113 with a longer length, which facilitates the processing of the bottom reinforcing beam 113 and reduces the cost of the bottom reinforcing beam 113. At the same time, since the receiving plate 13 is connected to the bottom surface of the two sub-reinforcing beams 1131 respectively, and the bottom surface of the receiving plate 13 is flush with the bottom surface of the bottom cross beam 112a, the load bearing capacity of the connection between the two sub-reinforcing beams 1131 can be improved by using the receiving plate 13 to ensure the overall strength of the bottom reinforcing beam 113, that is, through the above design, the overall strength can be ensured to facilitate processing.

[0068] In some embodiments, as shown in FIG. 13, the top plate 122 includes a third plate body 1221 and a fourth plate body 1222 arranged at intervals, the third plate body 1221 is located above the fourth plate body 1222 along the height direction f3, one side of the fourth plate body 1222 facing the third plate body 1221 is provided with a partition strip 1223, the partition strip 1223 extends along the length direction f1, and the partition strip 1223 is arranged at intervals with the third plate body 1221.

[0069] For example, the fourth plate body 1222 includes a plurality of top plate bodies 1222a arranged at intervals along the length direction f1, the frame 11 further includes a top reinforcing beam 116, the top reinforcing beam 116 is connected between two adjacent top plate bodies 1222a and connected between two adjacent top cross beams 112b, and the top reinforcing beam 116 further abuts against the third plate body 1221. Wherein, one side of each top plate body 1222a facing the third plate body 1221 is provided with a partition strip 1223.

[0070] By arranging the top reinforcing beam 116, the structural strength of the frame 11 can be strengthened, the battery module 2 can be better protected, and the safety of the energy storage device 100 during transportation and vibration can be improved. Moreover, the top reinforcing beam 116 can also support the third plate body 1221 to improve the structural strength of the top plate 122. At the same time, since the top plate 122 in the present application includes a plurality of top plate bodies 1222a, and the top reinforcing beam 116 is connected between two adjacent top plate bodies 1222a, the top plate body 1222a is easier to process and form than a whole plate with a larger area.

[0071] Embodiments of the second aspect of the present application disclose an energy storage system having the energy storage device according to any one of the preceding embodiments. Specifically, the energy storage system can further include other storages, such as an electrical storage, a fire storage, etc. It can be understood that the energy storage system having the energy storage device described above can bring the same or similar beneficial effects as the energy storage device, and specific descriptions can be referred to the descriptions of the embodiments of the energy storage device, which will not be repeated here.

[0072] Any combination of the technical features in the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0073] In addition, the above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the content of the present application should not be understood as a limitation, the protection scope of the present application should be subject to the appended claims.

Claims

1. An energy storage device, wherein, The energy storage device comprises: a box body having a length direction, the box body being provided with a mounting space; and a battery module comprising a liquid cooling structure and a plurality of single batteries in the mounting space, the liquid cooling structure being connected with the box body, and the liquid cooling structure having a first side and a second side opposite along the length direction, at least one single battery being arranged on the first side, and at least another single battery being arranged on the second side.

2. The energy storage device of claim 1, wherein, The box body further has a height direction and a width direction; The single battery arranged on the first side comprises a plurality of first sub-batteries arranged in a matrix stack along the height direction and the width direction; The single battery arranged on the second side comprises a plurality of second sub-batteries arranged in a matrix stack along the height direction and the width direction.

3. The energy storage device of claim 2, wherein, The first sub-batteries are connected to the first side by a heat-conducting adhesive, and the second sub-batteries are connected to the second side by a heat-conducting adhesive.

4. The energy storage device of claim 1, wherein, The liquid cooling structure comprises a first liquid cooling plate and a second liquid cooling plate, the first liquid cooling plate being connected with the box body and located at the bottom of the mounting space, the second liquid cooling plate being connected with the first liquid cooling plate at an angle, and the second liquid cooling plate having the first side and the second side, the first liquid cooling plate having a first portion located at the first side and a second portion located at the second side, the single battery arranged on the first side being supported on the first portion, and the single battery arranged on the second side being supported on the second portion.

5. The energy storage device of claim 4, wherein, An inner bottom surface of the box body is provided with a connecting hole, and the first liquid cooling plate is provided with a through hole for a fastener to pass through so that the fastener is threadedly connected with the connecting hole.

6. The energy storage device of claim 4, wherein, The box body comprises a frame and a plurality of cover plates, the frame comprises a plurality of longitudinal beams and a plurality of transverse beams, the plurality of longitudinal beams are arranged at intervals along the circumference of the box body, two transverse beams arranged at intervals are connected between any two adjacent longitudinal beams, each cover plate is connected between two adjacent longitudinal beams and connected between two adjacent transverse beams to form the mounting space; and The transverse beam located at the bottom of the box body along the height direction is a bottom transverse beam, the cover plate connected between two adjacent bottom transverse beams is a bottom plate, the top surface of the bottom transverse beam is higher than the top surface of the bottom plate along the height direction, so that a first gap is formed between the top surface of the first liquid cooling plate and the top surface of the bottom plate.

7. The energy storage device of claim 6, wherein, The bottom plate comprises a first plate body and a second plate body, the first plate body and the second plate body are arranged at intervals along the height direction, and the first plate body is closer to the top surface of the bottom transverse beam than the second plate body, wherein the top surface of the first plate body is lower than the top surface of the bottom transverse beam along the height direction, and the bottom surface of the second plate body is higher than the bottom surface of the bottom transverse beam.

8. The energy storage device of claim 7, wherein, The first plate body comprises two first sub-plate bodies arranged separately, and the two first sub-plate bodies are arranged at intervals along the width direction of the box body to form a second gap. The second plate body comprises two second sub-plate bodies arranged separately, the two second sub-plate bodies are arranged along the width direction of the box body, and the two second sub-plate bodies respectively extend along the height direction and are connected by a connecting plate, the two connecting plates are connected, and the two connecting plates are arranged separately from the first sub-plate body to form a third gap.

9. The energy storage device of claim 1, wherein, The box body comprises a frame and a plurality of cover plates, the frame comprises a plurality of longitudinal beams and a plurality of transverse beams, the plurality of longitudinal beams are arranged separately along the circumference of the box body, and two transverse beams arranged separately are connected between any two adjacent longitudinal beams, each cover plate is connected between two adjacent longitudinal beams and two adjacent transverse beams to form the mounting space.

10. The energy storage device of claim 9, wherein, The transverse beam at the bottom of the box body along the height direction thereof is a bottom transverse beam, and the cover plate connected between two adjacent bottom transverse beams is a bottom plate. The bottom plate comprises a plurality of bottom plate bodies arranged separately along the length direction, and the frame further comprises a bottom reinforcing beam connected between two adjacent bottom plate bodies and two adjacent bottom transverse beams.

11. The energy storage device of claim 10, wherein, The bottom reinforcing beam comprises two sub-reinforcing beams arranged separately, the two sub-reinforcing beams are arranged separately along the width direction of the box body, and the box body further comprises a receiving plate connected to the bottom surface of the two sub-reinforcing beams, and the bottom surface of the receiving plate is flush with the bottom surface of the bottom transverse beam.

12. The energy storage device of claim 9, wherein, The cover plate at the bottom of the box body along the height direction thereof is a bottom plate, and the cover plate at the top of the box body along the height direction thereof is a top plate, the frame further comprises a plurality of longitudinal reinforcing beams arranged separately, the plurality of longitudinal reinforcing beams abut between the bottom plate and the top plate, and two adjacent longitudinal reinforcing beams arranged along the length direction are used to abut the battery module to limit the position of the battery module in the mounting space.

13. The energy storage device of claim 1, wherein, The battery module is a plurality of battery modules arranged along the length direction.

14. An energy storage system, wherein, The energy storage system has the energy storage device according to any one of claims 1-13.

Images