Energy storage device, power utilization system, and energy storage system

Abstract

The application relates to an energy storage device, a power utilization system and an energy storage system. The energy storage device comprises an energy storage module, a liquid cooling plate, a fixing assembly and an adjusting piece. The energy storage module comprises a plurality of energy storage units arranged along a first direction. The liquid cooling plate is arranged on one side of the energy storage module and has a groove on the surface facing the energy storage module. The fixing assembly comprises two end plates, a binding belt and a fixing piece. The two end plates are arranged on the two sides of the energy storage module along the first direction. The binding belt is arranged around the outer periphery of the energy storage module and the end plates. The fixing piece is arranged through the end plates. The adjusting piece is arranged through the outer periphery of the fixing piece and swing-connected with the end plates. The adjusting piece is partially arranged between the binding belt and the end plates. The adjusting piece has a first state and a second state. When the adjusting piece is in the first state, the binding belt can be sleeved into or taken out of the energy storage module in the height direction. When the adjusting piece is in the second state, the adjusting piece abuts against and tensions the binding belt, and the binding belt is partially embedded in the groove. The heat conduction efficiency between the energy storage module and the liquid cooling plate is high.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, specifically to an energy storage device, a power consumption system, and an energy storage system. Background Technology

[0002] Currently, in the field of energy storage technology, to improve the output voltage of energy storage devices, multiple energy storage cells are often assembled into energy storage modules, which are then assembled into the housing of the energy storage device. However, energy storage cells generate a large amount of heat during operation. To meet the normal operating temperature requirements of the energy storage modules, liquid cooling plates are usually installed on the side of the energy storage modules to dissipate heat. To further improve the heat dissipation effect, thermally conductive adhesive is filled between the energy storage modules and the liquid cooling plates to enhance the thermal conductivity between them. However, the area between two adjacent energy storage modules is narrow and deep. Filling the area between adjacent energy storage modules from above with thermally conductive adhesive prevents air from escaping smoothly, creating a cavity. This significantly reduces the thermal conductivity between the energy storage modules and the liquid cooling plates. Summary of the Invention

[0003] In view of this, this application provides an energy storage device, an electrical system, and an energy storage system, wherein the energy storage module and the liquid cooling plate have high thermal conductivity.

[0004] This application provides an energy storage device, comprising an energy storage module, a liquid cooling plate, a fixing assembly, and an adjusting component. The energy storage module includes a plurality of energy storage cells arranged sequentially along a first direction. The fixing assembly includes an end plate, a strap, and a fixing member. Two end plates are spaced apart along the first direction on opposite sides of the energy storage module. The strap surrounds the outer periphery of the energy storage module and the end plates, used to assemble the plurality of energy storage cells and the end plates into a single unit. The fixing member passes through the end plate. The liquid cooling plate is disposed on one side of the energy storage module and has a groove on its surface facing the energy storage module. The liquid cooling plate includes a first part, a second part, a third part, and a fourth part, the first part, the second part, and the third part being connected sequentially along a second direction. Four parts are located on the same side of the first part, the second part, and the third part along the first direction and are respectively connected to the first part, the second part, and the third part; the second part is recessed into the first part, the third part, and the fourth part to form the groove; along the first direction, the fourth part protrudes from the energy storage module; the adjusting member passes through the outer periphery of the fixing member and is swayably connected to the end plate; the adjusting member is partially located between the strap and the end plate; the adjusting member has a first state and a second state; when the adjusting member is in the first state, the strap can be put into or taken out from the height direction of the energy storage module; when the adjusting member is in the second state, the adjusting member abuts against and tensions the strap, so that the portion of the strap opposite to the energy storage module is embedded in the groove.

[0005] Further, the adjusting member includes a first adjusting part, the first adjusting part having a rotating shaft, the adjusting member being rotatable relative to the end plate with the rotating shaft as the center, the first adjusting part including a first end and a second end disposed opposite to each other in a direction perpendicular to the rotating shaft, the distance between the first end and the rotating shaft being greater than the distance between the second end and the rotating shaft, the end plate having a window, the window penetrating the surface of the end plate away from the energy storage module, the fixing member passing through the window; when the adjusting member is in a first state, the first adjusting part is disposed within the window; when the adjusting member is in a second state, the first end is closer to the strap than the second end and the first end abuts against the strap, and the strap is partially embedded in the groove, wherein the first end partially protrudes from one side of the end plate.

[0006] Furthermore, the distance L between the first end and the rotating shaft is in the range of 18mm≤L≤26mm.

[0007] Furthermore, the adjusting member also includes a connecting part and a second adjusting part. The connecting part is bent and connected to the first adjusting part, and one end of the connecting part is connected to the first end. The second adjusting part is bent and connected to the connecting part and connected to the end of the connecting part away from the first adjusting part. The second adjusting part can be used to adjust the state of the adjusting member so as to realize the switching of the adjusting member between the first state and the second state.

[0008] Furthermore, the extension direction of the rotating shaft is a second direction, the first adjusting part, the connecting part and the second adjusting part are arranged along the second direction, the connecting part extends along the second direction, the extension directions of the first adjusting part and the second adjusting part are both perpendicular to the extension direction of the connecting part, the extension directions of the first adjusting part and the second adjusting part intersect, wherein the second direction intersects with the first direction.

[0009] Furthermore, the extension direction of the rotating shaft is a second direction, the end plate has a first through hole extending along the second direction, the first adjusting part has a second through hole, the second through hole serves as the rotating shaft, the fixing assembly further includes a fixing member, the fixing member is respectively inserted through the first through hole of the end plate and the second through hole of the first adjusting part, so that the adjusting member is rotatably connected to the end plate, wherein the second direction intersects with the first direction.

[0010] Furthermore, the window extends through the sidewall of the first through hole, and the adjusting member is disposed within the window.

[0011] Furthermore, along the second direction, the maximum height H1 of the adjusting member is in the range of 20mm≤H1≤32mm, wherein the second direction is the extension direction of the rotating shaft, and the second direction intersects with the first direction.

[0012] Furthermore, along the second direction, the ratio of the maximum height H1 of the adjusting member to the width H2 of the window satisfies the following relationship: 0.65≤H1 / H2≤0.9, where the second direction is the extension direction of the rotating shaft and intersects with the first direction.

[0013] Furthermore, along the second direction, the width of the strap is less than the width of the groove, wherein the second direction is the extension direction of the rotating shaft, and the second direction intersects with the first direction.

[0014] Furthermore, the energy storage modules are multiple, arranged along a third direction. The energy storage device also includes a first end strip and a second end strip. Along a second direction, the first end strip and the second end strip are respectively disposed on opposite sides of the multiple energy storage modules. Along the third direction, the first end strip is detachably connected to two end plates, and the second end strip is detachably connected to two end plates. The second direction is the extension direction of the rotating shaft, and the third direction is the direction in which the energy storage modules and the liquid cooling plate are arranged sequentially. The first direction intersects the second direction, and the second direction intersects the third direction.

[0015] This application also provides an electrical system, which includes: electrical equipment and an energy storage device provided in this application, wherein the energy storage device is used to supply power to the electrical equipment.

[0016] This application also provides an energy storage system, comprising: a user load, a power conversion device, and the energy storage device provided in this application. The power conversion device is used to convert other forms of energy into electrical energy. The power conversion device is electrically connected to the user load, and the electrical energy converted by the power conversion device supplies power to the user load. The energy storage device is electrically connected to both the user load and the power conversion device. The energy storage device stores the electrical energy converted by the power conversion device and supplies power to the user load.

[0017] In the liquid cooling plate provided in this application, the first part, the fourth part, and the third part are all connected to the second part to form the groove. When the adjusting member is in the second state, the adjusting member abuts against the strap, and the groove can be used to accommodate part of the strap. On the one hand, the groove provides the strap with a space for movement, allowing part of the strap to move in the gap between the energy storage module and the liquid cooling plate under the action of the adjusting member, thereby improving the binding effect of the strap on the end plate and the multiple energy storage cells. In the assembly process of the energy storage device provided in this application, the plurality of energy storage cells are arranged sequentially along a first direction, and the end plate is disposed on one side of the energy storage module along the first direction. A strap is then fitted around the outer periphery of the plurality of energy storage cells and the end plate to assemble the plurality of energy storage cells and the end plate into a single unit. At this time, the adjusting member is in a first state, and the strap provides initial fixation to the plurality of energy storage cells and the end plate. The strap can be fitted into or removed from the height direction of the energy storage module, facilitating movement of the strap relative to the energy storage module to achieve the assembly of the plurality of energy storage cells and the end plate. To further enhance the fastening effect of the strap on the end plate and the plurality of energy storage cells, the adjusting member can be adjusted from the first state to a second state. The adjusting member can swing relative to the fixing member and connect to the end plate, so that the adjusting member abuts against the strap, driving the strap to move towards the direction closer to the liquid cooling plate. The adjusting member abuts against and tensions the strap, and the strap opposite to the energy storage module is embedded in the groove. On the one hand, by adjusting the straps, the binding straps are tightened, which helps to enhance the binding effect of the straps on the multiple energy storage cells and the end plate, thereby improving the structural stability of the multiple energy storage cells and the end plate. On the other hand, the straps are partially embedded in the grooves, and the straps engage with the grooves. The grooves have a certain limiting effect on the straps, which improves the connection stability between the energy storage module and the liquid cooling plate, thereby helping to improve the structural stability of the energy storage device. On the other hand, the adjusting member part abuts against the strap and embeds the strap part into the groove, thereby increasing the distance between the surface of the strap facing the energy storage module and the surface of the energy storage module facing the strap. In other words, it increases the distance between the part of the energy storage module that contacts the strap and the strap. When thermally conductive adhesive is potted into the energy storage device to improve the thermal conductivity between the liquid cooling plate and the energy storage module, the distance between the part of the energy storage module that contacts the strap and the strap is large enough, and the thermally conductive adhesive can be directly potted downwards along the height direction of the energy storage module, improving the smoothness of potting the thermally conductive adhesive and helping to improve the efficiency of potting the thermally conductive adhesive into the energy storage device.In addition, the binding strap can prevent air bubbles from forming during the potting process of thermally conductive adhesive, thereby preventing the part of the energy storage unit facing the liquid cooling plate from not being coated with thermally conductive adhesive. This improves the uniformity of the potting thermally conductive adhesive, enhances the heat dissipation uniformity of the liquid cooling plate to the energy storage module, and helps to improve the thermal conductivity between the energy storage module and the liquid cooling plate. Furthermore, the thermally conductive adhesive can fill the gap between the energy storage module and the strap in contact with the strap, preventing the thermally conductive adhesive from being difficult to fill the contact area due to the small distance between the energy storage module and the strap. Therefore, when the adjusting member is in the second state, it is beneficial to improve the efficiency of potting thermally conductive adhesive onto the energy storage module and the liquid cooling plate, and also to improve the uniformity of the potting thermally conductive adhesive, so that the thermally conductive adhesive can cover the entire surface of the multiple energy storage units facing the liquid cooling plate, thereby improving the heat conduction effect of the liquid cooling plate on the energy storage module, avoiding the danger of fire, explosion, etc. caused by the energy storage device not being able to dissipate heat evenly, and improving the safety performance of the energy storage device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the implementation will be briefly introduced below. Obviously, the drawings described below are some implementations of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the structure of an energy storage system according to another embodiment of this application;

[0021] Figure 3 This is a circuit block diagram of an energy storage system according to an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the structure of an electrical system according to an embodiment of this application;

[0023] Figure 5 This is a circuit block diagram of an electrical system according to an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application;

[0025] Figure 7 This is an exploded structural diagram of an energy storage device according to an embodiment of this application;

[0026] Figure 8This is a partial structural schematic diagram of an energy storage device according to an embodiment of this application;

[0027] Figure 9 An energy storage device according to an embodiment of this application Figure 8 Enlarged view of the dashed box A in the middle;

[0028] Figure 10 This is a partial structural schematic diagram of an energy storage device according to another embodiment of this application;

[0029] Figure 11 The energy storage device according to another embodiment of this application Figure 10 Enlarged view of the dashed box in section B;

[0030] Figure 12 This is a schematic diagram of the structure of an adjusting member according to an embodiment of this application;

[0031] Figure 13 This is a schematic diagram illustrating the cooperation relationship between the adjusting member and the fixing member according to an embodiment of this application;

[0032] Figure 14 This is a top view of the adjusting member according to an embodiment of this application;

[0033] Figure 15 This is a schematic diagram illustrating the cooperation relationship between the end plate and the energy storage cell according to an embodiment of this application;

[0034] Figure 16 This is a side view of the adjusting member according to an embodiment of this application;

[0035] Figure 17 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application;

[0036] Figure 18 This is a schematic diagram of the structure of a liquid cooling plate according to an embodiment of this application;

[0037] Figure 19 This is a schematic diagram of the structure of a liquid cooling plate according to another embodiment of this application;

[0038] Figure 20 This is a top view of an energy storage device according to an embodiment of this application;

[0039] Figure 21 An energy storage device according to an embodiment of this application Figure 20 A cross-sectional view along the CC direction;

[0040] Figure 22 An energy storage device according to an embodiment of this application Figure 21 Enlarged view of the dashed box in the middle E;

[0041] Figure 23 The energy storage device according to another embodiment of this application Figure 20A cross-sectional view along the DD direction;

[0042] Figure 24 An energy storage device according to an embodiment of this application Figure 23 Enlarged view of the dashed box in the middle F.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100-Energy storage device, 110-Energy storage module, 111-Energy storage unit, 120-Liquid cooling plate, 121-First part, 122-Second part, 123-Third part, 124-Fourth part, 125-Groove, 130-Fixing component, 131-End plate, 1311-First through hole, 1312-Window, 132-Binding strap, 133-Fixing component, 140-Adjusting component, 141-First adjusting part, 1411-Rotating shaft, 1412-First end, 1413-Second end, 1414-Second through hole, 142-Connecting part, 143-Second adjusting part, 150-First end bar, 160-Second end bar, 200-Power system, 210-Power equipment, 300-Energy storage system, 310-User load, 320-Power conversion device. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0046] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0047] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] Currently, in the field of energy storage technology, to improve the energy density of energy storage devices, multiple energy storage cells are often assembled into energy storage modules and secured with cable ties before being assembled into the energy storage device. However, individual energy storage cells generate a large amount of heat during operation. To meet the heat dissipation requirements of the energy storage modules, liquid cooling plates are often installed on the sides of the energy storage modules to dissipate heat. Commonly, thermally conductive adhesive is applied between the energy storage module and the liquid cooling plate to improve the thermal conductivity between them. The energy storage module is usually installed with cable ties first, followed by the liquid cooling plate. However, when potting the thermally conductive adhesive between the liquid cooling plate and the energy storage module, the gap between the cable ties and the energy storage module is often too narrow, increasing the difficulty of potting the adhesive through this gap. Therefore, the adhesive can only be filled by extending from the side into the gap between the liquid cooling plate and the energy storage module. However, the narrow gap between the energy storage module and the liquid cooling plate, along with the long and deep area between adjacent modules, prevents air from escaping smoothly and creates cavities. This significantly reduces the thermal conductivity between the energy storage module and the liquid cooling plate. Furthermore, it hinders personnel and machine operation, resulting in low glue application efficiency and poor glue application quality.

[0049] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form based on future application needs. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels. The generation of green electricity currently relies heavily on photovoltaics, wind power, and hydropower. However, wind and solar energy generally suffer from strong intermittency and large fluctuations, which can cause grid instability, insufficient electricity during peak demand periods, and excessive electricity during off-peak periods. Unstable voltage can also damage power grids. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it, releasing it as electricity when needed. Simply put, energy storage is like a large "power bank," storing electrical energy when photovoltaic and wind power are abundant and releasing the stored electricity when needed.

[0050] Taking electrochemical energy storage as an example, this solution provides an energy storage device. The energy storage device is equipped with multiple energy storage cell groups. It mainly uses the chemical elements in the energy storage cells as the energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, it stores the electrical energy generated by wind and solar energy in the chemical energy storage cells. When the external power consumption reaches its peak, the stored power is released for use, or transferred to places with power shortages for use.

[0051] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding types of energy storage devices include:

[0052] Large-scale energy storage power stations applied to wind and solar power plants can assist renewable energy generation in meeting grid connection requirements while improving renewable energy utilization. As a high-quality active / reactive power source on the power supply side, energy storage power stations achieve load matching in time and space, enhance renewable energy absorption capacity, reduce instantaneous power fluctuations, reduce grid impact, improve the absorption of new energy generation, and are significant in grid system backup, alleviating peak load supply pressure, and peak and frequency regulation. Energy storage containers applied to the grid side primarily function in peak shaving, frequency regulation, and alleviating grid congestion. They can achieve peak shaving and valley filling of electricity load, charging individual energy storage units during off-peak hours and releasing the stored electricity during peak hours, thus achieving a balance between power production and consumption. Small-scale energy storage cabinets applied to the consumer side primarily function in self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improving power supply reliability. Depending on the application scenario, consumer-side energy storage can be divided into commercial and industrial energy storage cabinets, residential energy storage devices, and energy storage charging piles, which are generally used in conjunction with distributed photovoltaic systems. Industrial and commercial users can utilize energy storage for peak-valley price arbitrage and capacity cost management. In electricity markets implementing peak-valley pricing, charging energy storage systems during low-price periods and discharging them during high-price periods allows for arbitrage, reducing electricity costs. Furthermore, industrial enterprises using two-part tariffs can use energy storage systems to store energy during off-peak hours and discharge it during peak load periods, thereby reducing peak power demand and the maximum declared demand, thus lowering capacity charges. Residential photovoltaic (PV) systems with energy storage can improve self-consumption levels. High electricity prices and poor power supply stability drive demand for residential PV installations. Considering that PV generates electricity during the day while user load is generally higher at night, configuring energy storage allows for better utilization of PV power, improving self-consumption levels and reducing electricity costs. Additionally, communication base stations, data centers, and other fields require energy storage for backup power.

[0053] In the field of energy storage technology, when multiple energy storage cells are integrated into an energy storage device, liquid cooling plates are often installed on the side of the energy storage cells to dissipate heat and meet their heat dissipation requirements. Typically, thermally conductive adhesive is used to bond the energy storage cells and the liquid cooling plates together. However, during the charging and discharging process of the energy storage cells, they repeatedly expand and contract, causing the contact area between the cells and the thermally conductive adhesive to constantly change. Once the thermally conductive adhesive has cured, its contact area with the energy storage cells becomes fixed. The continuous changes in the volume of the energy storage cells lead to constant changes in the contact area between them. After a period of use, the connection between the energy storage cells and the liquid cooling plates becomes unstable, potentially causing lithium detachment from the liquid cooling plates and energy storage cells. This compromises the cooling effect of the liquid cooling plates, making it impossible to guarantee proper heat dissipation for the energy storage cells.

[0054] Please see Figures 1 to 3 This application also provides an energy storage system 300, which includes: a user load 310, a power conversion device 320, and an energy storage device 100 provided in this application. The power conversion device 320 is used to convert other forms of energy into electrical energy. The power conversion device 320 is electrically connected to the user load 310, and the electrical energy converted by the power conversion device 320 supplies power to the user load 310. The energy storage device 100 is electrically connected to both the user load 310 and the power conversion device 320. The energy storage device 100 stores the electrical energy converted by the power conversion device 320 and supplies power to the user load 310.

[0055] Understandably, in the energy storage system 300 provided in this application, the user load 310, the power conversion device 320 and the energy storage device 100 are electrically connected to each other.

[0056] In the energy storage system 300 provided in this embodiment, the power conversion device 320, the user load 310, and the energy storage device 100 are electrically connected to each other, so that the electrical energy converted by the power conversion device 320 can be stored in the energy storage device 100 and can also supply power to the user load 310. In addition, the energy storage device 100 can also supply power to the user load 310 during peak electricity price periods. The energy storage device 100 has high safety performance, thus giving the energy storage system 300 high safety performance.

[0057] Optionally, the power conversion device 320 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0058] Figure 1 This is a schematic diagram of the structure of an energy storage system 300 according to an embodiment of this application, and this application Figure 1 The embodiments are illustrated using a residential energy storage scenario in user-side energy storage as an example. The energy storage device 100 of this application is not limited to residential energy storage scenarios. Figure 1 In this embodiment, the power conversion device 320 can be, but is not limited to, a photovoltaic panel, the user load 310 can be, but is not limited to, household appliances such as streetlights and air conditioners, and the energy storage device 100 can be, but is not limited to, a small energy storage box that can be wall-mounted on an outdoor wall. Specifically, the photovoltaic panel can convert solar energy into electrical energy during periods of low electricity prices, and the energy storage device 100 is used to store this electrical energy and supply it to streetlights and household appliances during periods of high electricity prices, or to provide power during power outages / power failures.

[0059] Figure 2 This is a schematic diagram of the structure of an energy storage system 300 according to another embodiment of this application. The embodiment in this application is illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device 100 in this application is not limited to its generation / distribution side energy storage scenario. Figure 2 In this embodiment, the user load 310 is a high-voltage cable, and there are two power conversion devices 320, one a wind turbine and the other a photovoltaic panel. The wind turbine converts wind energy into electrical energy, and the photovoltaic panel converts solar energy into electrical energy. In the energy storage system 300 provided in this application embodiment, during power generation, the power conversion device 320 is used to convert other forms of energy into electrical energy, which is then connected to the high-voltage cable and supplied to the power consumption side. When the power load is low and the power conversion device 320 generates excess power, the excess power is stored in the energy storage device 100, reducing wind and solar curtailment rates and improving the absorption of new energy power generation. When the power load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 100 in conjunction with the high-voltage cable in a grid-connected mode to supply power to the power consumption side, providing various services such as peak shaving, frequency regulation, and backup for power grid operation, fully leveraging the peak shaving function of the power grid, promoting peak shaving and valley filling, and alleviating the power supply pressure on the power grid.

[0060] Optionally, there can be multiple energy storage devices 100, which can be connected in series or in parallel. These multiple energy storage devices 100 are supported and electrically connected by an isolation plate (not shown). In this embodiment, "multiple" refers to two or more. An energy storage box can also be provided outside the energy storage device 100 to house it.

[0061] Optionally, the energy storage device 100 may include, but is not limited to, a single battery cell, a battery module, a battery pack, or a battery system. The actual application form of the energy storage device 100 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 100. This application embodiment only illustrates the example of the energy storage device 100 including multiple energy storage modules 110. When the energy storage device 100 is a single battery cell, the energy storage device 100 may be at least one of cylindrical batteries, prismatic batteries, etc.

[0062] Please see Figure 4 and Figure 5 This application also provides an electrical system 200, which includes an electrical device 210 and an energy storage device 100 provided in this application, wherein the energy storage device 100 is used to supply power to the electrical device 210.

[0063] Understandably, in the power system 200, the electrical equipment 210 is electrically connected to the energy storage device 100.

[0064] In this embodiment, the energy storage device 100 has high safety performance, so that when the energy storage device 100 is applied to the power system 200, it can provide a stable power supply to the electrical equipment 210, so that the power system 200 can work stably.

[0065] The power system 200 in this application embodiment can be, but is not limited to, portable electronic devices such as mobile phones, tablets, laptops, desktop computers, smart bracelets, smartwatches, e-readers, and game consoles. It can also be a vehicle such as a car, truck, sedan, van, freight train, high-speed train, or electric vehicle. Furthermore, it can be various household appliances. The power system 200 in the embodiment shown in the figures of this application is an energy storage battery cabinet.

[0066] It is understood that the power system 200 described in this embodiment is merely one form of the power system 200 used by the energy storage device 100, and should not be construed as a limitation on the power system 200 provided in this application, nor should it be construed as a limitation on the power system 200 provided in various embodiments of this application.

[0067] Please see Figures 6 to 11 , Figure 18 as well as Figure 19 In this application Figure 8 In this embodiment, the adjusting member 140 is in a first state; in this application Figure 10In the embodiment, the adjusting member 140 is in a second state. This application provides an energy storage device 100, which includes an energy storage module 110, a liquid cooling plate 120, a fixing assembly 130, and an adjusting member 140. The energy storage module 110 includes components along a first direction (e.g., ...). Figure 6 As shown in Figure X, multiple energy storage units 111 are arranged sequentially; a liquid cooling plate 120 is disposed on one side of the energy storage module 110, and the liquid cooling plate 120 has a groove 125 located on the surface facing the energy storage module 110; the liquid cooling plate 120 includes a first part 121, a second part 122, a third part 123 and a fourth part 124, the first part 121, the second part 122 and the third part 123 are connected sequentially along a second direction, and the fourth part 124 is located on the surface facing the energy storage module 110 along the first direction. The first part 121, the second part 122, and the third part 123 are on the same side and are respectively connected to the first part 121, the second part 122, and the third part 123; the second part 122 is recessed into the first part 121, the third part 123, and the fourth part 124 to form the groove 125; along the first direction, the fourth part 124 protrudes from the energy storage module 110; the fixing assembly 130 includes an end plate 131, a strap 132, and a fixing... Component 133, comprising two end plates 131, the two end plates 131 being spaced apart along a first direction on opposite sides of the energy storage module 110; a binding strap 132 surrounding the outer periphery of the energy storage module 110 and the end plates 131, used to assemble the plurality of energy storage units 111 and the end plates 131 into a single unit; a fixing member 133 passing through the end plate 131; and an adjusting member 140 passing through the outer periphery of the fixing member 133 and swayably connected to the end plate 131. 1. The adjusting member 140 is partially located between the strap 132 and the end plate 131. The adjusting member 140 has a first state and a second state. When the adjusting member 140 is in the first state, the strap 132 can be inserted into or removed from the height direction of the energy storage module 110. When the adjusting member 140 is in the second state, the adjusting member 140 abuts against and tensions the strap 132, so that the strap 132 opposite to the energy storage module 110 is embedded in the groove 125.

[0068] Understandably, the liquid cooling plate 120 is disposed on one side of the energy storage module 110 for heat dissipation of the plurality of energy storage cells 111.

[0069] Understandably, the two end plates 131 are disposed on opposite sides of the energy storage module 110 along the first direction. This can be because the end plates 131, the energy storage unit 111, and the end plates 131 are disposed sequentially along the first direction.

[0070] Understandably, the second part 122 is recessed into the first part 121, the third part 123, and the fourth part 124 to form the groove 125. This can be because when the liquid cooling plate 120 is disposed on one side of the energy storage module 110, the second part 122 is disposed further away from the energy storage module 110 than the first part 121, the third part 123, and the fourth part 124, to form the groove 125 facing the surface of the energy storage module 110.

[0071] Understandably, the fourth part 124 protruding from the energy storage module 110 along the first direction can be either the fourth part 124 protruding from the strap 132 along the first direction, or the strap 132's orthogonal projection on the liquid cooling plate 120 falling within the range of the groove 125 along a direction parallel to the stacked arrangement of the energy storage module 110 and the liquid cooling plate 120.

[0072] Understandably, the adjusting member 140 passes through the outer periphery of the fixing member 133 and is swayably connected to the end plate 131. This can be interpreted as the adjusting member 140 being rotatably connected to the end plate 131 relative to the fixing member 133.

[0073] Understandably, when the adjusting member 140 is in the first state, the strap 132 can be put into or taken out from the height direction of the energy storage module 110. Specifically, when the adjusting member 140 is in the first state, the strap 132 is fitted around the outer periphery of the energy storage module 110 and there is a certain distance between the strap 132 and the energy storage module 110, and the strap 132 can move relative to the energy storage module 110.

[0074] Understandably, when the adjusting member 140 is in the second state, the adjusting member 140 abuts against and tensions the strap 132. This can be achieved by the strap 132 being sleeved on the outer periphery of the energy storage module 110 and in a taut state, with tension on the strap 132 and fixed in place, so that the strap 132 opposite to the energy storage module 110 is embedded in the groove 125.

[0075] Understandably, the strap 132 is arranged around the outer periphery of the energy storage module 110 and the end plate 131 to assemble the plurality of energy storage units 111 and the end plate 131 into one unit. Specifically, the strap 132 is sleeved on the outer periphery of the energy storage module 110 and the end plate 131 and exerts a certain constraint on the energy storage module 110 and the end plate 131, so that the plurality of energy storage units 111 and the end plate 131 are assembled into one unit.

[0076] Understandably, the adjusting member 140 is rotatably connected to the end plate 131. The adjusting member 140 is located between the strap 132 and the energy storage module 110. The adjusting member 140 and the strap 132 are arranged opposite to each other. When the adjusting member 140 is rotatably connected, it can abut against the strap 132 to drive a portion of the strap 132 to move toward the liquid cooling plate 120 and to embed a portion of the strap 132 into the groove 125.

[0077] Understandably, the first part 121, the second part 122, and the third part 123 are connected sequentially along the second direction, and the fourth part 124 is located on the same side of the first part 121, the second part 122, and the third part 123 along the first direction and is connected to the first part 121, the second part 122, and the third part 123 respectively. It can be that the first part 121, the fourth part 124, and the third part 123 are connected to form a structure similar to a "C", and the first part 121, the fourth part 124, and the third part 123 are all connected to the second part 122.

[0078] In the liquid cooling plate 120 provided in this embodiment, the first part 121, the fourth part 124, and the third part 123 are all connected to the second part 122 to form the groove 125. When the adjusting member 140 is in the second state, the adjusting member 140 abuts against the strap 132, and the groove 125 can be used to accommodate part of the strap 132. On the one hand, the groove 125 provides the strap 132 with a space for movement, so that part of the strap 132 can move in the gap between the energy storage module 110 and the liquid cooling plate 120 under the action of the adjusting member 140, thereby improving the binding effect of the strap 132 on the end plate 131 and the plurality of energy storage cells 111. During the assembly process of the energy storage device 100 provided in this embodiment, the plurality of energy storage units 111 are arranged sequentially along a first direction, and the end plate 131 is disposed on one side of the energy storage module 110 along the first direction. The binding strap 132 is sleeved on the outer periphery of the plurality of energy storage units 111 and the end plate 131 to assemble the plurality of energy storage units 111 and the end plate 131 into a whole. At this time, the adjusting member 140 is in the first state, and the binding strap 132 initially fixes the plurality of energy storage units 111 and the end plate 131. The binding strap 132 can be sleeved or unsleeved from the height direction of the energy storage module 110, so as to facilitate the movement of the binding strap 132 relative to the energy storage module 110 to realize the assembly of the plurality of energy storage units 111 and the end plate 131. To further enhance the fastening effect of the strap 132 on the end plate 131 and the plurality of energy storage units 111, the adjusting member 140 can be adjusted from the first state to the second state. The adjusting member 140 can swing relative to the fixing member 133 to connect with the end plate 131, so that the adjusting member 140 abuts against the strap 132, driving the strap 132 to move toward the liquid cooling plate 120. The adjusting member 140 abuts against and tensions the strap 132, and makes the strap 132 opposite to the energy storage module 110 embedded in the groove 125. On the one hand, by adjusting the adjustment member 140, the strap 132 is tightened, which helps to improve the binding effect of the strap 132 on the plurality of energy storage cells 111 and the end plate 131, thereby improving the structural stability of the plurality of energy storage cells 111 and the end plate 131. On the other hand, the strap 132 is partially embedded in the groove 125, and the strap 132 partially engages with the groove 125. The groove 125 has a certain limiting effect on the strap 132, which improves the connection stability between the energy storage module 110 and the liquid cooling plate 120, thereby helping to improve the structural stability of the energy storage device 100.On the other hand, the adjusting member 140 partially abuts against the strap 132 and partially embeds the strap 132 into the groove 125, thereby increasing the distance between the surface of the strap 132 facing the energy storage module 110 and the surface of the energy storage module 110 facing the strap 132. In other words, it increases the distance between the part of the energy storage module 110 that contacts the strap 132 and the strap 132. When thermally conductive adhesive is potted into the energy storage device 100 to improve the thermal conductivity between the liquid cooling plate 120 and the energy storage module 110, the distance between the part of the energy storage module 110 that contacts the strap 132 and the strap 132 is large enough that the thermally conductive adhesive can be directly potted downwards along the height direction of the energy storage module 110, improving the smoothness of potting the thermally conductive adhesive and helping to improve the efficiency of potting the thermally conductive adhesive into the energy storage device 100. In addition, the binding strap 132 can prevent air bubbles from forming during the potting process of thermally conductive adhesive, thereby preventing the portion of the energy storage unit 111 facing the liquid cooling plate 120 from not being coated with thermally conductive adhesive. This improves the uniformity of the potting thermally conductive adhesive and the heat dissipation uniformity of the liquid cooling plate 120 to the energy storage module 110, which is beneficial to improving the thermal conductivity between the energy storage module 110 and the liquid cooling plate 120. Furthermore, the thermally conductive adhesive can fill the gap between the contact portion of the energy storage module 110 and the strap 132 and the strap 132, avoiding the difficulty in filling the contact portion of the energy storage module 110 and the strap 132 with thermally conductive adhesive due to the small distance between them. Therefore, when the adjusting member 140 is in the second state, it is beneficial to improve the efficiency of potting thermally conductive adhesive onto the energy storage module 110 and the liquid cooling plate 120, and also to improve the uniformity of the potting thermally conductive adhesive, so that the thermally conductive adhesive can cover the entire surface of the multiple energy storage units 111 facing the liquid cooling plate 120, thereby improving the heat conduction effect of the liquid cooling plate 120 on the energy storage module 110, avoiding the danger of fire, explosion, etc. caused by the energy storage device 100 not being able to dissipate heat evenly, and improving the safety performance of the energy storage device 100.

[0079] Specifically, please see Figures 20 to 24 ,in, Figure 21 An energy storage device 100 according to an embodiment of this application Figure 20 A cross-sectional view along the CC direction, in which the regulating member 140 in the energy storage device 100 is in the first state. Figure 23 The energy storage device 100, according to another embodiment of this application, is along Figure 20 A cross-sectional view along the DD direction, in which the regulating member 140 in the energy storage device 100 is in the second state.

[0080] Optionally, the number of energy storage modules 110 is multiple, and the number of liquid cooling plates 120 is multiple, along a third direction (e.g., Figure 6 As shown in Figure Z, the energy storage module 110 and the liquid cooling plate 120 are alternately arranged; in other words, each liquid cooling plate 120 is disposed between two adjacent energy storage modules 110. The third direction intersects with the first direction.

[0081] Understandably, when the liquid cooling plate 120 is disposed between two adjacent energy storage modules 110, along the third direction, the two opposite surfaces of the liquid cooling plate 120 have the groove 125, and the groove 125 is respectively disposed towards one of the two energy storage modules 110.

[0082] Optionally, there are two end plates 131, and the two end plates 131 are respectively disposed on opposite sides of the energy storage module 110 along the first direction.

[0083] Please see Figure 12 and Figure 13 In some embodiments, the adjusting member 140 includes a first adjusting portion 141 having a pivot 1411. The adjusting member 140 can rotate relative to the end plate 131 with the pivot 1411 as the center. The first adjusting portion 141 includes a first end 1412 and a second end 1413 disposed opposite to each other in a direction perpendicular to the pivot 1411. The distance between the first end 1412 and the pivot 1411 is greater than the distance between the second end 1413 and the pivot 1411. The end plate 131 has a window 1312 through which... The end plate 131 is positioned away from the surface of the energy storage module 110, and the fixing member 133 is inserted through the opening 1312. When the adjusting member 140 is in the first state, the first adjusting part 141 is disposed within the opening 1312. When the adjusting member 140 is in the second state, the first end 1412 is closer to the strap 132 than the second end 1413, and the first end 1412 abuts against the strap 132, causing the strap 132 to be partially embedded in the groove 125. The first end 1412 protrudes from one side of the end plate 131.

[0084] Understandably, the second end 1413 is closer to the pivot 1411 than the first end 1412.

[0085] Understandably, when the adjusting member 140 is in the first state, the first adjusting part 141 is disposed in the window 1312, and both the first end 1412 and the second end 1413 are received in the window.

[0086] Understandably, the first end portion 1412 protrudes from one side of the end plate 131. This can be because the first end portion 1412 protrudes from the side of the end plate 131 facing the liquid cooling plate 120, so that the first end portion 1412 abuts against the strap 132 and the strap 132 is partially embedded in the groove 125; or the first end portion 1412 is partially disposed on the window 1312 and partially disposed outside the window 1312.

[0087] In this embodiment, the adjusting member 140 can rotate relative to the end plate 131 with the pivot 1411 as the center, and the distance between the first end 1412 and the pivot 1411 is greater than the distance between the second end 1413 and the pivot 1411. Therefore, the adjusting member 140 rotates eccentrically relative to the end plate 131. The end plate 131 has a window 1312, and the fixing member 133 passes through the window 1312. The window 1312 has a certain receiving space and a certain movement space, so that when the fixing member 133 passes through the outer periphery of the fixing member 133, the first adjusting part 141 can rotate relative to the fixing member 133. When the adjusting member 140 is in the first state, both the first end 1412 and the second end 1413 are received in the window. When the adjusting member 140 is in the second state, the first end 1412 protrudes from one side of the end plate 131. The first end 1412 is closer to the strap 132 than the second end 1413, and the first end 1412 abuts against the strap 132. When the adjusting member 140 is adjusted from the first state to the second state, the first end 1412 rotates about the pivot 1411 until it abuts against the strap 132, and the strap 132 is partially embedded in the groove 125. This helps to improve the binding effect of the strap 132 on the plurality of energy storage cells 111 and the end plate 131, and also helps to increase the distance between the part of the energy storage module 110 that contacts the strap 132 and the strap 132. When thermally conductive adhesive is potted onto the energy storage device 100 to improve the thermal conductivity between the liquid cooling plate 120 and the energy storage module 110, the first end 1412 abuts against the strap 132, allowing the thermally conductive adhesive to be directly poured downwards along the height direction of the energy storage module 110. This improves the smoothness of the thermally conductive adhesive potting process, and the thermally conductive adhesive can fill the gap between the part of the energy storage module 110 that contacts the strap 132 and the strap 132, improving the uniformity of the thermally conductive adhesive potting. This, in turn, improves the heat dissipation uniformity of the liquid cooling plate 120 on the energy storage module 110, which is beneficial for improving the heat conduction effect of the liquid cooling plate 120 on the energy storage module 110. This avoids the danger of fire, explosion, or other hazards caused by the energy storage device 100's inability to dissipate heat evenly, thus improving the safety performance of the energy storage device 100. Furthermore, the window 1312 penetrates the surface of the end plate 131. Compared to the solution where the end plate 131 does not have a window 1312, the window 1312 helps to reduce the weight of the end plate 131, which in turn helps to reduce the weight of the energy storage device 100 and improves the lightweight design of the energy storage device 100.

[0088] Optionally, in some embodiments, the rotating shaft 1411 is a solid shaft, and the rotating shaft 1411 may be a cylindrical shaft. In other embodiments, the rotating shaft 1411 is a virtual shaft, and the rotating shaft 1411 may be a through hole.

[0089] Please see Figure 14 In some embodiments, the distance L between the first end 1412 and the rotating shaft 1411 is in the range of 18mm≤L≤26mm.

[0090] Specifically, the distance L between the first end 1412 and the rotating shaft 1411 can be, but is not limited to, 18mm, 18.4mm, 18.8mm, 19mm, 19.2mm, 19.6mm, 20mm, 20.2mm, 20.6mm, 20.8mm, 21mm, 21.5mm, 22mm, 22.5mm, 23mm, 23.5mm, 24mm, 24.5mm, 25mm, 25.5mm, and 26mm.

[0091] In this embodiment, when the distance L between the first end 1412 and the rotating shaft 1411 satisfies the range of 18mm ≤ L ≤ 26mm, the distance L between the first end 1412 and the rotating shaft 1411 is within a reasonable range. When the adjusting member 140 is in the second state, the first end 1412 abuts against the strap 132 and causes the strap 132 to partially embed into the groove 125. The abutting force of the first end 1412 against the strap 132 is within a reasonable range, so that the... The strap 132 can not only strongly bind the multiple energy storage units 111 and the end plate 131, but also prevent breakage due to excessive tension. In addition, the first end 1412 abuts against the strap 132 and extends the strap 132 within a reasonable range. The strap 132 will not interfere with the liquid cooling plate 120, and can also smoothly pour the thermally conductive adhesive from the height direction of the energy storage device 100 downwards, improving the efficiency of potting thermally conductive adhesive into the energy storage module 110 and the liquid cooling plate 120. When the distance L between the first end 1412 and the rotating shaft 1411 is greater than 26mm, the distance between the first end 1412 and the rotating shaft 1411 is too large. This causes the first adjusting part 141 to abut against the strap 132 and partially embed the strap 132 into the groove 125 when the adjusting member 140 is in the second state. On the one hand, the holding force of the first adjusting part 141 on the strap 132 is too large, causing the strap 132 to be in an overly taut state, increasing the risk of the strap 132 breaking due to excessive tautness. On the other hand, the distance between the first end 1412 and the rotating shaft 1411 is too large, so the first end 1412 abuts against the strap 132 and pushes the strap 132 out too much. This may cause the first end 1412 and the strap 132 to abut against and squeeze the liquid cooling plate 120, reducing the safety performance of the energy storage device 100. When the distance L between the first end 1412 and the rotating shaft 1411 is less than 18mm, the distance between the first end 1412 and the rotating shaft 1411 is too small. As a result, the first end 1412 abuts against the strap 132 and extends the strap 132 too little. In other words, the distance between the part of the energy storage module 110 that contacts the strap 132 and the strap 132 is too small. This makes it difficult for the thermally conductive adhesive to be smoothly poured downwards from the height of the energy storage device 100 when the thermally conductive adhesive is potted between the liquid cooling plate 120 and the energy storage module 110. This reduces the efficiency of potting the thermally conductive adhesive between the energy storage module 110 and the liquid cooling plate 120.

[0092] In some embodiments, the adjusting member 140 further includes a connecting portion 142 and a second adjusting portion 143. The connecting portion 142 is bent and connected to the first adjusting portion 141, and one end of the connecting portion 142 is connected to the first end portion 1412. The second adjusting portion 143 is bent and connected to the connecting portion 142 and connected to the end of the connecting portion 142 that is away from the first adjusting portion 141. The second adjusting portion 143 can be used to adjust the state of the adjusting member 140 to realize the switching of the adjusting member 140 between the first state and the second state.

[0093] Understandably, the second adjustment unit 143 can switch the adjustment member 140 between the first state and the second state. Specifically, the second adjustment unit 143 can adjust the adjustment member 140 from the first state to the second state, and can also adjust the adjustment member 140 from the second state to the first state.

[0094] In the adjusting member 140 provided in this embodiment, the first adjusting part 141, the connecting part 142, and the second adjusting part 143 are sequentially bent and connected. The opposite ends of the connecting part 142 are respectively connected to the first adjusting part 141 and the second adjusting part 143. When the operator adjusts the position of the second adjusting part 143, the second adjusting member 140 can drive the first adjusting part 141 to move through the connecting part 142. The second adjusting part 143 acts as a "handle," facilitating the operator to adjust the state of the adjusting member 140, allowing the first adjusting part 141 to switch between abutting the strap 132 and not abutting the strap 132. Specifically, when the second adjusting part 143 drives the first end 1412 of the first adjusting part 141 to abut the strap 132 through the connecting part 142, the adjusting member 140 is adjusted from the first state to the second state. When the second adjustment part 143 drives the first end 1412 of the first adjustment part 141 away from the strap 132 via the connecting part 142, the adjustment member 140 is adjusted from the second state to the first state. The second adjustment part 143 allows for adjustment of the state of the adjustment member 140 when thermally conductive adhesive is potted onto the energy storage device 100 to improve the thermal conductivity between the liquid cooling plate 120 and the energy storage module 110. This increases the distance between the part of the energy storage module 110 in contact with the strap 132 and the strap 132, which improves the efficiency and uniformity of potting thermally conductive adhesive onto the energy storage module 110 and the liquid cooling plate 120.

[0095] In some embodiments, the extending direction of the rotating shaft 1411 is a second direction (e.g., Figure 6As shown in the diagram (Y), the first adjusting part 141, the connecting part 142, and the second adjusting part 143 are arranged along the second direction. The connecting part 142 extends along the second direction. The extending directions of the first adjusting part 141 and the second adjusting part 143 are both perpendicular to the extending direction of the connecting part 142. The extending directions of the first adjusting part 141 and the second adjusting part 143 intersect, wherein the second direction intersects with the first direction.

[0096] Understandably, the extension direction of the rotating shaft 1411 is a second direction, which is parallel to the height direction of the energy storage device 100.

[0097] Understandably, the first adjustment part 141, the connecting part 142 and the second adjustment part 143 are arranged along the second direction, which can be that the first adjustment part 141, the connecting part 142 and the second adjustment part 143 are stacked sequentially along the second direction.

[0098] In this embodiment, along the second direction, the first adjusting part 141, the connecting part 142, and the second adjusting part 143 are arranged sequentially. The extending direction of the connecting part 142 is perpendicular to the extending direction of the first adjusting part 141 and the extending direction of the second adjusting part 143. When the second adjusting part 143 drives the first adjusting part 141 to move through the connecting part 142, the connecting part 142 can drive the first adjusting part 141 and the second adjusting part 143 to rotate together. The extending direction of the connecting part 142 is perpendicular to the rotation direction of the first adjusting part 141 and the rotation direction of the second adjusting part 143, which helps to save the length of the adjusting member 140 on the rotation plane, thereby facilitating the miniaturization design of the adjusting member 140 and avoiding interference of the adjusting member 140 with the setting of the energy storage module 110, the liquid cooling plate 120, and the fixing component 130 in the energy storage device 100. Furthermore, since the extension direction of the first adjustment part 141 intersects the extension direction of the second adjustment part 143, the extension directions of the first adjustment part 141 and the second adjustment part 143 are different. This facilitates the second adjustment part 143 in adjusting the first adjustment part 141 through the connecting part 142, and avoids the first adjustment part 141 and the second adjustment part 143 from simultaneously abutting against the strap 132. This makes it easier for the operator to adjust the position of the second adjustment part 143, which is beneficial to improving the user experience.

[0099] Optionally, the extending direction of the connecting portion 142 is parallel to the second direction.

[0100] In this embodiment, the extension direction of the connecting part 142 is parallel to the second direction. When the adjusting member 140 rotates relative to the end plate 131 with the rotating shaft 1411 as the center, the extension direction of the connecting part 142 is perpendicular to the rotation plane of the adjusting member 140. The extension direction of the connecting part 142 is perpendicular to the rotation direction of the first adjusting part 141 and the rotation direction of the second adjusting part 143. This helps to save the length of the adjusting member 140 on the rotation plane, thereby facilitating the miniaturization design of the adjusting member 140 and avoiding interference of the adjusting member 140 with the setting of the energy storage module 110, liquid cooling plate 120 and fixing assembly 130 in the energy storage device 100.

[0101] Please see Figure 15 In some embodiments, the extending direction of the rotating shaft 1411 is a second direction, the end plate 131 has a first through hole 1311 extending along the second direction, the first adjusting part 141 has a second through hole 1414, the second through hole 1414 serves as the rotating shaft 1411, and the fixing assembly 130 further includes a fixing member 133, the fixing member 133 passing through the first through hole 1311 of the end plate 131 and the second through hole 1414 of the first adjusting part 141 respectively, so that the adjusting member 140 is rotatably connected to the end plate 131, wherein the second direction intersects with the first direction.

[0102] Understandably, the first through hole 1311 and the second through hole 1414 are interconnected.

[0103] Understandably, the fastener 133 passing through the first through hole 1311 of the end plate 131 and the second through hole 1414 of the first adjusting part 141 can be configured such that the end plate 131 is sleeved on the outer periphery of the fastener 133 and the first adjusting part 140 is sleeved on the outer periphery of the fastener 133.

[0104] In this embodiment, the second through hole 1414 is the pivot 1411 of the first adjusting part 141, and the pivot 1411 is a virtual axis. The fixing member 133 passes through the first through hole 1311 of the end plate 131 and the second through hole 1414 of the first adjusting part 141, respectively. The end plate 131 and the adjusting member 140 are respectively sleeved around the outer periphery of the fixing member 133. When the fixing member 133 is fixed to the first through hole 1311, the adjusting member 140 rotates relative to the fixing member 133 with the second through hole 1414 as the pivot 1411, thereby enabling the adjusting member 140 to rotatably connect to the end plate 131 and switch between the first and second states. This changes the distance between the contact portion of the energy storage module 110 and the strap 132 and the strap 132, allowing the thermally conductive adhesive to fill the energy storage module 110 and the strap 132. The gap between the contact portion and the strap 132 helps to improve the efficiency of potting thermally conductive adhesive onto the energy storage module 110 and the liquid cooling plate 120, and also helps to improve the uniformity of the potting thermally conductive adhesive, so that the thermally conductive adhesive can cover the entire surface of the multiple energy storage units 111 facing the liquid cooling plate 120, thereby improving the heat conduction effect of the liquid cooling plate 120 on the energy storage module 110, avoiding the danger of fire, explosion or other hazards caused by the energy storage device 100 not being able to dissipate heat evenly from the energy storage module 110, and improving the safety performance of the energy storage device 100.

[0105] In some embodiments, the end plate 131 has a window 1312 that penetrates the sidewall of the first through hole 1311 and the surface of the end plate 131, and the adjusting member 140 is disposed within the window 1312.

[0106] Understandably, the window 1312 penetrates the side wall of the first through hole 1311, and the window 1312 is interconnected with the first through hole 1311.

[0107] In this embodiment, the window 1312 penetrates the side wall of the first through hole 1311 and the adjusting member 140 is disposed within the window 1312. Therefore, the window 1312 has a certain receiving space and a certain amount of moving space, such that when the fixing member 133 passes through the first through hole 1311 and the second through hole 1414 of the first adjusting part 141, when the adjusting member 140 is in the first state, the adjusting member 140 can be received within the window 1312; when the adjusting member 140 is adjusted from the first state to the second state, the adjusting member 140 can rotate relative to the fixing member 133 within the window 1312 and ultimately abut against the strap 132, causing the strap 132 to partially embed into the groove 125. Furthermore, the window 1312 extends through the surface of the end plate 131. Compared to a design where the end plate 131 does not have a window 1312, the window 1312 helps to reduce the weight of the end plate 131, which in turn helps to reduce the weight of the energy storage device 100 and improves the lightweight design of the energy storage device 100.

[0108] Please see Figure 16 In some embodiments, the maximum height H1 of the adjusting member 140 along the second direction is in the range of 20mm≤H1≤32mm, wherein the second direction is the extension direction of the rotating shaft 1411 and intersects with the first direction.

[0109] Specifically, along the second direction, the maximum height H1 of the adjusting member 140 can be, but is not limited to, 20mm, 21mm, 22mm, 22.5mm, 23mm, 23.5mm, 24mm, 25mm, 25.5mm, 26mm, 26.5mm, 27mm, 27.5mm, 28mm, 28.5mm, 29mm, 30mm, 30.5mm, 31mm, 31.5mm, and 32mm.

[0110] Understandably, the maximum height of the adjusting member 140 is the distance along the second direction between the surface of the first adjusting part 141 facing away from the second adjusting part 143 and the surface of the second adjusting part 143 facing away from the first adjusting part 141.

[0111] In this embodiment, the adjusting member 140 is disposed within the opening 1312, and the height of the adjusting member 140 should be adapted to the width of the opening 1312. Along the second direction, when the maximum height H1 of the adjusting member 140 satisfies the range 20mm≤H1≤32mm, the height of the adjusting member 140 is within a reasonable range, and the width of the opening 1312 is also within a reasonable range. When adjusting the adjusting member 140, the operator can apply force to the adjusting member 140 to make the adjusting member 140 rotate relative to the rotating shaft 1411 and quickly open the strap 132 towards the liquid cooling plate 120, shortening the adjustment time of the adjusting member 140, which is beneficial for subsequent potting of thermally conductive adhesive onto the energy storage module 110 and the liquid cooling plate 120. Furthermore, the distance of the opening 1312 is within a reasonable range, which effectively reduces the weight of the end plate 131, prevents the opening 1312 from being too large and reducing the structural strength of the end plate 131, and also avoids the fastener 133 from passing through the opening 1312 when it is inserted due to the opening 1312 being too large. This is beneficial to improving the assembly performance of the adjusting member 140 and the end plate 131. When the maximum height H1 of the adjusting member 140 is greater than 32mm, the maximum height of the adjusting member 140 is too large. Correspondingly, in order to accommodate the adjusting member 140, the width of the opening 1312 is also too large. On the one hand, the maximum height of the adjusting member 140 is too large, so when the first end 1412 of the first adjusting part 141 abuts against the strap 132, the adjusting member 140 expands the strap 132 to an excessive degree. The first adjusting part 141 exerts too much force on the strap 132. Excessive holding force causes the strap 132 to be in an overly taut state, increasing the risk of breakage due to excessive tension. Furthermore, if the distance between the first end 1412 and the rotating shaft 1411 is too large, the first end 1412 will exert excessive pressure on the strap 132, potentially causing it to press against and squeeze the liquid cooling plate 120, thus reducing the safety performance of the energy storage device 100. On the other hand, excessively wide openings 1312 may reduce the structural strength of the end plate 131, making it difficult for the end plate 131 to secure the multiple energy storage cells 111 and provide impact and shock protection. On the other hand, if the width of the opening 1312 is too large, during the assembly of the energy storage device 100, when the fastener 133 is inserted into the first through hole 1311, the fastener 133 may protrude from the opening 1312, which increases the risk of misalignment of the fastener 133 during insertion, increases the operator's operational accuracy in inserting the fastener 133 during assembly, and consequently reduces assembly efficiency.When the maximum height H1 of the adjusting member 140 is less than 20mm, the maximum height of the adjusting member 140 is too small, resulting in a small size of the adjusting member 140. This makes it difficult for the operator to apply force to the adjusting member 140 when it is adjusted to the second state and the adjusting member 140 is against the strap 132. This makes it difficult for the adjusting member 140 to rotate relative to the rotating shaft 1411, and it is difficult for the adjusting member 140 to quickly push the strap 132 towards the liquid cooling plate 120. This reduces the user experience and increases the time required to adjust the adjusting member 140, thereby reducing the efficiency of potting thermally conductive adhesive onto the energy storage module 110 and the liquid cooling plate 120.

[0112] Please see Figure 17 In some embodiments, along the second direction, the ratio of the maximum height H1 of the adjusting member 140 to the width H2 of the window 1312 satisfies the relationship: 0.65≤H1 / H2≤0.9, wherein the second direction is the extension direction of the rotating shaft 1411, and the second direction intersects the first direction.

[0113] Specifically, the ratio of the maximum height H1 of the adjusting member 140 to the width H2 of the window 1312 can be, but is not limited to, 0.65, 0.67, 0.69, 0.7, 0.72, 0.75, 0.79, 0.8, 0.82, 0.84, 0.86, 0.87, 0.88, and 0.9.

[0114] Understandably, along the second direction, the maximum height H1 of the adjusting member 140 is less than the width H2 of the opening 1312.

[0115] In this embodiment, when the maximum height H1 of the adjusting member 140 and the width H2 of the opening 1312 satisfy the relationship 0.65≤H1 / H2≤0.9, the ratio of the maximum height of the adjusting member 140 to the width of the opening 1312 is within a reasonable range. During the transition between the first and second states, the adjusting member 140 can rotate within the space of the opening 1312, avoiding interference with the opening 1312 and reducing the efficiency of adjusting the adjusting member 140. Furthermore, the size of the adjusting member 140 is also within a reasonable range, facilitating adjustment by the operator, and the width of the opening 1312 is also within a reasonable range, facilitating the insertion of the fixing member 133, thus improving the assembly efficiency of the adjusting member 140. When the ratio of the maximum height H1 of the adjusting member 140 to the width H2 of the window 1312 is greater than 0.9, the ratio is too large, and the difference between the maximum height of the adjusting member 140 and the width of the window 1312 is too small. Therefore, when the adjusting member 140 is positioned on the window 1312, it will be difficult for the adjusting member 140 to rotate within the space of the window 1312 during the transition between the first and second states. The adjusting member 140 may interfere with the window 1312, thereby reducing the efficiency of the operator's adjustment. When the ratio of the maximum height H1 of the adjusting member 140 to the width H2 of the window 1312 is less than 0.65, the maximum height of the adjusting member 140 is too small, or the width of the window 1312 is too large. When the maximum height of the adjusting member 140 is too small, its size is too small. This makes it difficult for the operator to apply force to the adjusting member 140 when it is adjusted to the second state and the adjusting member 140 is against the strap 132. This makes it difficult for the adjusting member 140 to rotate relative to the rotating shaft 1411, and makes it difficult for the adjusting member 140 to quickly push the strap 132 closer to the liquid cooling plate 120. This reduces the operator's experience, increases the adjustment time, and thus reduces the efficiency of potting thermally conductive adhesive onto the energy storage module 110 and the liquid cooling plate 120. When the width of the opening 1312 is too large, it may reduce the structural strength of the end plate 131, making it difficult for the end plate 131 to fix the multiple energy storage cells 111 and provide them with impact and shock protection.Furthermore, if the width of the opening 1312 is too large, during the assembly of the energy storage device 100, when the fastener 133 is inserted into the first through hole 1311, the fastener 133 may protrude through the opening 1312, which increases the risk of misalignment of the fastener 133 during insertion, increases the operator's operational accuracy in inserting the fastener 133 during assembly, and consequently reduces assembly efficiency.

[0116] In some embodiments, along the second direction, the width of the strap 132 is less than the width of the groove 125, wherein the second direction is the extending direction of the rotating shaft 1411, and the second direction intersects the first direction.

[0117] In this embodiment, along the second direction, the width of the strap 132 is less than the width of the groove 125. Therefore, when the adjusting member 140 is in the second state, and the adjusting member 140 abuts against the strap 132, causing the strap 132 to partially embed into the groove 125, the portion of the strap 132 embedded in the groove 125 will not protrude from the groove 125. In other words, the portion of the strap 132 that contacts the liquid cooling plate 120 falls entirely within the groove 125. In this embodiment, the mutual engagement between the strap 132 and the groove 125 helps improve the connection stability between the energy storage module 110 and the liquid cooling plate 120, thereby improving the structural stability of the energy storage device 100. In addition, the groove 125 can limit the position of the strap 132. When the adjusting member 140 is in the second state, the strap 132 is embedded in the groove 125, which can prevent the strap 132 from sliding relative to the plurality of energy storage cells 111 along the second direction, thereby improving the fixing effect of the strap 132 on the plurality of energy storage cells 111 and the end plate 131.

[0118] Please see Figure 18 and Figure 19 In some embodiments, the liquid cooling plate 120 includes a first part 121, a second part 122, a third part 123, and a fourth part 124. The first part 121, the second part 122, and the third part 123 are connected sequentially along a second direction. The fourth part 124 is located on the same side of the first part 121, the second part 122, and the third part 123 along the first direction and is connected to the first part 121, the second part 122, and the third part 123 respectively. The second part 122 is recessed into the first part 121, the third part 123, and the fourth part 124 to form the groove 125. Along the first direction, the fourth part 124 protrudes from the energy storage module 110.

[0119] In this embodiment, the first part 121, the second part 122, and the third part 123 are connected sequentially along a second direction. The fourth part 124 is located on the same side of the first part 121, the second part 122, and the third part 123 along the first direction and is connected to the first part 121, the second part 122, and the third part 123 respectively. The first part 121, the fourth part 124, and the third part 123 are connected to form a C-shaped structure, and the first part 121, the fourth part 124, and the third part 123 are all connected to the second part 122 to form the groove 125. When the adjusting member 140 is in the second state, the adjusting member 140 abuts against the strap 132, and the groove 125 can be used to accommodate part of the strap 132. On the one hand, the groove 125 provides space for the strap 132 to move, allowing a portion of the strap 132 to move within the gap between the energy storage module 110 and the liquid cooling plate 120 under the influence of the adjusting member 140, thereby improving the binding effect of the strap 132 on the end plate 131 and the plurality of energy storage cells 111. On the other hand, the groove 125 provides a receiving space for the strap 132. When the adjusting member 140 is in the second state, the strap 132 is partially embedded in the groove 125, and the strap 132 is partially engaged with the groove 125. The groove 125 provides a certain limiting effect on the strap 132, thereby improving the connection stability between the energy storage module 110 and the liquid cooling plate 120. Furthermore, along the first direction, the fourth part 124 protrudes from the energy storage module 110, such that along the direction parallel to the stacked arrangement of the energy storage module 110 and the liquid cooling plate 120, the orthogonal projection of the strap 132 on the liquid cooling plate 120 falls within the range of the groove 125. In other words, the part of the strap 132 that contacts the liquid cooling plate 120 is completely embedded in the groove 125, which helps to further enhance the limiting effect of the groove 125 on the strap 132.

[0120] Optionally, the first part 121 has a first flow channel, the third part 123 has a second flow channel, and the fourth part 124 has a third flow channel. The first flow channel, the third flow channel, and the second flow channel are connected in sequence to form a flow channel.

[0121] In this embodiment, the first flow channel, the third flow channel, and the second flow channel are sequentially connected, so that when cooling fluid is injected into the liquid cooling plate 120, the cooling fluid can flow sequentially from the first flow channel, the third flow channel, and the second flow channel, thereby dissipating heat from the energy storage module 110 disposed on one side of the liquid cooling plate 120, and timely dissipating the heat generated by the energy storage module 110 during operation, avoiding the danger of fire, explosion, or other hazards caused by excessive temperature of the energy storage device 100, and improving the safety performance of the energy storage device 100.

[0122] In some embodiments, there are two end plates 131, which are respectively disposed on opposite sides of the energy storage module 110 along a first direction. There are multiple energy storage modules 110, which are arranged along a third direction. The energy storage device 100 also includes a first end strip 150 and a second end strip 160. Along a second direction, the first end strip 150 and the second end strip 160 are respectively disposed on opposite sides of the multiple energy storage modules 110. Along the third direction, the first end strip 150 is detachably connected to the two end plates 131, and the second end strip 160 is detachably connected to the two end plates 131. The second direction is the extension direction of the rotating shaft 1411, and the third direction is the direction in which the energy storage module 110 and the liquid cooling plate 120 are arranged sequentially. The first direction intersects the second direction, and the second direction intersects the third direction.

[0123] Understandably, when there are two end plates 131, the end plates 131, the energy storage module 110, and the end plates 131 are arranged sequentially along the first direction.

[0124] Understandably, along the second direction, the first end bar 150, the energy storage module 110, and the second end bar 160 are arranged sequentially.

[0125] Understandably, along the third direction upwards, the energy storage module 110 and the liquid cooling plate 120 are arranged alternately in sequence.

[0126] Understandably, the first direction, the second direction, and the third direction intersect each other.

[0127] In this embodiment, two end plates 131 are respectively disposed on opposite sides of the energy storage module 110 along the first direction, and the two end plates 131 limit the energy storage module 110 from the first direction. In addition, the binding strap 132 is disposed around the outer periphery of the energy storage module 110 and the end plates 131. When the adjusting member 140 is in the second state, the binding strap 132 has a strong binding force on the energy storage module 110 and the end plates 131. The binding strap 132 limits the plurality of energy storage cells 111 from the first direction and the third direction, thereby improving the structural stability of the plurality of energy storage cells 111 assembled in the energy storage device 100. Furthermore, along the second direction, the first end strip 150 and the second end strip 160 are respectively disposed on opposite sides of the plurality of energy storage modules 110. Along the third direction, the first end strip 150 is detachably connected to two end plates 131, and the second end strip 160 is detachably connected to two end plates 131. The first end strip 150 and the second end strip 160 cooperate with each other, achieving both a fixed connection between two adjacent energy storage modules 110 in the third direction and a limiting position of the energy storage modules 110 in the second direction, thereby improving the structural stability of the energy storage modules 110 when assembled into the energy storage device 100. Furthermore, the detachable connection of the first end strip 150 to two end plates 131 and the detachable connection of the second end strip 160 to two end plates 131 facilitates the disassembly and connection of the energy storage device 100, reducing the assembly difficulty and cost of the energy storage device 100.

[0128] Optionally, in some embodiments, the first end strip 150 has a first through hole (not shown), the second end strip 160 has a second through hole (not shown), and the fixing member 133 is respectively inserted through the first through hole of the first end strip 150, the first through hole 1311 of the end plate 131, the second through hole 1414 of the first adjusting part 141, and the second through hole of the second end strip 160, so as to fix the fixing member 133 in the energy storage device 100.

[0129] Understandably, the first through hole, the first through hole 1311, the second through hole 1414 and the second through hole are connected in sequence.

[0130] In this embodiment, the fixing member 133 is sequentially inserted through the first through hole of the first end strip 150, the first through hole 1311 of the end plate 131, the second through hole 1414 of the first adjusting part 141, and the second through hole of the second end strip 160 to fix the fixing member 133 in the energy storage device 100. This helps to improve the structural stability of the fixing member 133 in the energy storage device 100, thereby facilitating the rotation of the adjusting member 140 relative to the fixing member 133, and thus enabling the adjusting member 140 to switch between the first state and the second state.

[0131] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. An energy storage device, characterized in that, The energy storage device includes: An energy storage module, comprising a plurality of energy storage cells arranged sequentially along a first direction; A fixing assembly includes an end plate, a strap, and a fixing member. There are two end plates, which are spaced apart along a first direction on opposite sides of the energy storage module. The straps are arranged around the outer periphery of the energy storage module and the end plates to assemble the plurality of energy storage cells and the end plates into a single unit. The fixing member passes through the end plate. A liquid cooling plate is disposed on one side of the energy storage module. The liquid cooling plate has a groove on the surface facing the energy storage module. The liquid cooling plate includes a first part, a second part, a third part, and a fourth part. The first part, the second part, and the third part are connected sequentially along a second direction. Along the first direction, the fourth part is located on the same side of the first part, the second part, and the third part and is connected to the first part, the second part, and the third part respectively. The second part is recessed into the first part, the third part, and the fourth part to form the groove. Along the first direction, the fourth part protrudes from the energy storage module. An adjusting member is provided on the outer periphery of the fixing member and is swayably connected to the end plate. The adjusting member is partially located between the strap and the end plate. The adjusting member has a first state and a second state. When the adjusting member is in the first state, the strap can be put into or taken out from the height direction of the energy storage module. When the adjusting member is in the second state, the adjusting member abuts against and tensions the strap, so that the strap opposite to the energy storage module is embedded in the groove, thereby increasing the distance between the surface of the strap facing the energy storage module and the surface of the energy storage module facing the strap.

2. The energy storage device according to claim 1, characterized in that, The adjusting member includes a first adjusting part with a rotating shaft. The adjusting member can rotate relative to the end plate with the rotating shaft as the center. The first adjusting part includes a first end and a second end disposed opposite to each other in a direction perpendicular to the rotating shaft. The distance between the first end and the rotating shaft is greater than the distance between the second end and the rotating shaft. The end plate has a window that penetrates the surface of the end plate away from the energy storage module. The fixing member passes through the window. When the adjusting member is in a first state, the first adjusting part is disposed in the window. When the adjusting member is in a second state, the first end is closer to the strap than the second end and the first end abuts against the strap, causing the strap to be partially embedded in the groove. The first end protrudes from one side of the end plate.

3. The energy storage device according to claim 2, characterized in that, The distance L between the first end and the rotating shaft is in the range of 18mm≤L≤26mm.

4. The energy storage device according to claim 2, characterized in that, The adjusting member further includes a connecting part and a second adjusting part. The connecting part is bent and connected to the first adjusting part, and one end of the connecting part is connected to the first end. The second adjusting part is bent and connected to the connecting part and connected to the end of the connecting part away from the first adjusting part. The second adjusting part can be used to adjust the state of the adjusting member to realize the switching of the adjusting member between the first state and the second state.

5. The energy storage device according to claim 4, characterized in that, The extension direction of the rotating shaft is the second direction. The first adjusting part, the connecting part and the second adjusting part are arranged along the second direction. The connecting part extends along the second direction. The extension directions of the first adjusting part and the second adjusting part are both perpendicular to the extension direction of the connecting part. The extension directions of the first adjusting part and the second adjusting part intersect. The second direction intersects with the first direction.

6. The energy storage device according to claim 2, characterized in that, The extension direction of the rotating shaft is a second direction. The end plate has a first through hole extending along the second direction. The first adjusting part has a second through hole. The second through hole serves as the rotating shaft. The fixing member is respectively inserted through the first through hole of the end plate and the second through hole of the first adjusting part, so that the adjusting member can be rotatably connected to the end plate. The second direction intersects with the first direction.

7. The energy storage device according to claim 6, characterized in that, The window also extends through the side wall of the first through hole, and the adjusting member is disposed within the window.

8. The energy storage device according to claim 2, characterized in that, Along the second direction, the height H1 of the adjusting member is in the range of 20mm≤H1≤32mm, wherein the second direction is the extension direction of the rotating shaft and intersects with the first direction.

9. The energy storage device according to claim 7, characterized in that, Along the second direction, the ratio of the maximum height H1 of the adjusting member to the width H2 of the window satisfies the following relationship: 0.65≤H1 / H2≤0.9, where the second direction is the extension direction of the rotating shaft and intersects with the first direction.

10. The energy storage device according to claim 2, characterized in that, Along the second direction, the width of the strap is less than the width of the groove, wherein the second direction is the extension direction of the rotating shaft, and the second direction intersects the first direction.

11. The energy storage device according to claim 2, characterized in that, The energy storage module comprises multiple modules arranged along a third direction. The energy storage device further includes a first end strip and a second end strip. Along a second direction, the first end strip and the second end strip are respectively disposed on opposite sides of the multiple energy storage modules. Along the third direction, the first end strip is detachably connected to two end plates, and the second end strip is detachably connected to two end plates. The first end strip and the second end strip cooperate with each other to achieve a fixed connection between two adjacent energy storage modules in the third direction and to limit the movement of the energy storage modules in the second direction. The second direction is the extension direction of the rotating shaft, and the third direction is the direction in which the energy storage modules and the liquid cooling plate are arranged sequentially. The first direction intersects the second direction, and the second direction intersects the third direction.

12. An electrical system, characterized in that, include: Electrical equipment; as well as The energy storage device according to any one of claims 1 to 11, wherein the energy storage device is used to supply power to the electrical equipment.

13. An energy storage system, characterized in that, include: User load; An energy conversion device is used to convert other forms of energy into electrical energy. The energy conversion device is electrically connected to the user load, and the electrical energy converted by the energy conversion device supplies power to the user load. The energy storage device according to any one of claims 1 to 11, wherein the energy storage device is electrically connected to the user load and the power conversion device respectively, the energy storage device stores the electrical energy converted by the power conversion device, and the energy storage device supplies power to the user load.

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