Energy storage device and energy storage system

Abstract

This application provides an energy storage device and an energy storage system, which can change the outgoing direction of the electrical connection wires in the energy storage device, providing users with a variety of optional customized outgoing wiring schemes. The energy storage device is placed on a support surface. The energy storage device includes an energy storage box, an adapter box, and electrical connection wires. The energy storage box has a receiving cavity and a first wire passage hole. The first wire passage hole penetrates the side of the box and the cavity wall. Electronic components are located in the receiving cavity. The adapter box is installed on the side of the box and has a receiving cavity, a second wire passage hole, and a third wire passage hole. The second wire passage hole penetrates the surface of the adapter box facing the box and the cavity wall. The third wire passage hole penetrates the surface of the adapter box facing the support surface and the cavity wall. One end of the electrical connection wire is electrically connected to the electronic component, and the other end of the electrical connection wire passes through the first wire passage hole, the second wire passage hole, the receiving cavity, and the third wire passage hole in sequence.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an energy storage device and an energy storage system. Background Technology

[0002] In energy storage systems, energy storage devices such as energy storage containers can be used to store and release electrical energy to balance power supply and demand, and are widely used in new energy power plants and grid-side energy storage. Existing energy storage containers need to be connected to a power conversion system (PCS) via electrical connection cables to achieve power conversion and control. However, the wiring method of the electrical connection cables in energy storage containers is unreasonable, failing to meet user needs and affecting the user experience. Summary of the Invention

[0003] This application provides an energy storage device and an energy storage system that can change the outgoing direction of the electrical connection wires in the energy storage device, providing more optional configurations for the product and offering users a variety of optional customized outgoing wire solutions to meet users' different outgoing wire requirements for the electrical connection wires of the energy storage device in different usage scenarios.

[0004] In a first aspect, this application provides an energy storage device placed on a support surface. The energy storage device includes an energy storage box, an adapter box, and an electrical connection cable. The energy storage box includes a housing and electronic components. The housing has a receiving cavity and a first wire passage hole. The receiving cavity is located inside the housing. The first wire passage hole penetrates the side of the housing and the cavity wall of the receiving cavity. The electronic components are located inside the receiving cavity. The adapter box is mounted on the side of the housing. The adapter box has a receiving cavity, a second wire passage hole, and a third wire passage hole. The receiving cavity is located inside the adapter box. The second wire passage hole penetrates the surface of the adapter box facing the housing and the cavity wall of the receiving cavity, and communicates with the first wire passage hole. The third wire passage hole penetrates the surface of the adapter box facing the support surface and the cavity wall of the receiving cavity. One end of the electrical connection cable is electrically connected to the electronic components, and the other end of the electrical connection cable passes sequentially through the first wire passage hole, the second wire passage hole, the receiving cavity, and the third wire passage hole.

[0005] The adapter box includes an adapter disposed within the receiving cavity. The adapter includes a first adapter portion and a second adapter portion. The first adapter portion extends within the receiving cavity toward the second wire-passing hole. The second adapter portion is fixedly connected to the end of the first adapter portion away from the second wire-passing hole and extends within the receiving cavity toward the third wire-passing hole. The electrical connection wire includes a first wire harness segment and a second wire harness segment. The first wire harness segment passes through the first wire-passing hole and the second wire-passing hole and is electrically connected between the electronic component and the first adapter portion. The second wire harness segment is electrically connected to the second adapter portion and passes through the third wire-passing hole.

[0006] The system includes multiple adapters, each including a positive adapter and a negative adapter. Along a first direction, the positive and negative adapters are spaced apart. Along a second direction, the positive and negative adapters are staggered. The second direction intersects the first direction. The system also includes multiple electrical connecting wires, each including a positive connecting wire and a negative connecting wire. The first wire harness segment of the positive connecting wire is electrically connected between the electronic component and the first adapter portion of the positive adapter. The second wire harness segment of the positive connecting wire is electrically connected to the second adapter portion of the positive adapter. The first wire harness segment of the negative connecting wire is electrically connected between the electronic component and the first adapter portion of the negative adapter. The second wire harness segment of the negative connecting wire is electrically connected to the second adapter portion of the negative adapter.

[0007] There are two third wire-passing holes, which are spaced apart along the first direction; the second wire harness segment of the positive electrode electrical connection wire passes through one of the third wire-passing holes, and the second wire harness segment of the negative electrode electrical connection wire passes through the other third wire-passing hole.

[0008] The adapter box further includes a fixing bracket, a first insulating post, and a second insulating post. The fixing bracket, the first insulating post, and the second insulating post are all located within the receiving cavity. The fixing bracket includes a first fixing part and a second fixing part. The first fixing part is fixedly connected to the cavity wall of the receiving cavity and extends within the receiving cavity towards the second wire passage hole. The second fixing part is fixedly connected to the side of the first fixing part away from the second wire passage hole and extends within the receiving cavity towards the third wire passage hole. The first insulating post is installed on the first fixing part, and the second insulating post is installed on the second fixing part. The first adapter part is installed at the end of the first insulating post away from the first fixing part, and the second adapter part is installed at the end of the second insulating post away from the second fixing part.

[0009] The adapter box is further provided with a first through hole, which penetrates the surface of the adapter box away from the housing and the cavity wall of the receiving cavity. The first through hole is located on the side of the receiving cavity away from the second wire hole. At least a portion of the second adapter part is disposed opposite to the first through hole.

[0010] The adapter box further includes a main body, a first cover plate, and a first sealing part. The main body is provided with the receiving cavity, the second wire passage hole, the third wire passage hole, and the first through hole. The first cover plate covers the first through hole, and the first sealing part is arranged around the first through hole and is sealed between the first cover plate and the main body.

[0011] The adapter box is further provided with a second through hole, which penetrates the surface of the adapter box away from the bearing surface and the cavity wall of the receiving cavity. The second through hole is located on the side of the receiving cavity away from the third wire hole. At least a portion of the first adapter part is disposed opposite to the second through hole.

[0012] The adapter box further includes a main body, a second cover plate, and a second sealing part. The main body is provided with the receiving cavity, the second wire passage hole, the third wire passage hole, and the second through hole. The second cover plate covers the second through hole, and the second sealing part is arranged around the second through hole and is sealed between the second cover plate and the main body.

[0013] Secondly, this application also provides an energy storage system, including an energy storage converter and an energy storage device as described in any of the preceding claims, wherein the energy storage converter is electrically connected to the energy storage device.

[0014] In the energy storage device provided in this application, the electrical connection cable exits the housing cavity of the enclosure through the first cable pass-through hole, passes through the second cable pass-through hole into the housing cavity of the adapter box, and then exits the adapter box through the third cable pass-through hole. It is understood that by adding an adapter box to the side of the energy storage enclosure, the user's requirement for the electrical connection cable of the energy storage device to exit from the side and bottom of the energy storage device can be met, thus facilitating the user's connection of the electrical connection cable to the energy storage converter and greatly solving the wiring difficulties between the energy storage device and the energy storage converter. Simultaneously, when the user only needs the electrical connection cable to exit from the side of the energy storage device, the adapter box can be removed. In this case, the electrical connection cable can be directly led out from the first cable pass-through hole of the enclosure, satisfying the user's requirement for the electrical connection cable to exit from the side of the energy storage device. Compared to existing technologies where electrical connection lines can only be routed from the side or bottom of the energy storage device, the energy storage device provided in this application can offer both a route solution where the electrical connection lines are routed from the side to the bottom of the energy storage device, and a route solution where the electrical connection lines are routed directly from the side of the energy storage device. This provides the product with more optional configurations and, in turn, allows users to have a variety of optional customized route solutions to meet the different route requirements of users for the electrical connection lines of the energy storage device in different usage scenarios. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0016] Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the energy storage system according to another embodiment of this application;

[0018] Figure 3 yes Figure 2 A schematic diagram of the energy storage device in the energy storage system shown;

[0019] Figure 4 yes Figure 3 A schematic diagram of the energy storage tank in the energy storage device shown;

[0020] Figure 5 yes Figure 4 Enlarged view of region A in the middle;

[0021] Figure 6 yes Figure 3 A schematic diagram of the junction box and electrical connection lines in the energy storage device shown.

[0022] Figure 7 yes Figure 3 A schematic diagram of the junction box in the energy storage device shown;

[0023] Figure 8 yes Figure 7 A schematic diagram of the adapter box shown from another angle;

[0024] Figure 9 yes Figure 8 The exploded view of the adapter box shown.

[0025] Figure 10 yes Figure 9 A partial structural diagram of the junction box shown.

[0026] Figure 11 yes Figure 9 A schematic diagram of the structure of the first cover plate and the first sealing part in the adapter box shown;

[0027] Figure 12 yes Figure 9 A schematic diagram of the structure of the second cover plate, the second sealing part, and the warning label in the adapter box shown;

[0028] Figure 13 yes Figure 9 A schematic diagram of the structure of the third seal and the third fastener in the adapter box shown;

[0029] Figure 14 yes Figure 9 The diagram shows the structure of the main body and wiring assembly in the adapter box.

[0030] Figure 15 It is an electrical connection wire and Figure 14 The diagram shows the structure of the wiring assembly.

[0031] Figure 16 It is an electrical connection wire and Figure 14 The diagram shows the structure of the wiring assembly from another angle. Detailed Implementation

[0032] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0033] Because the energy people need is highly time- and space-dependent, in order to make rational use of energy and improve energy efficiency, it is necessary to use a medium or device to store one form of energy in the same way or by converting it into another form of energy, and then release it in a specific form of energy based on future application needs.

[0034] Currently, the generation of green electricity generally relies on green energy sources such as photovoltaics, wind power, and hydropower. However, wind and solar power are generally characterized by 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 the power grid. 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. When needed, this energy can be converted back into electrical energy and released. 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.

[0035] Taking electrochemical energy storage as an example, this solution provides an energy storage device 100 for use in an energy storage system. The energy storage device 100 is equipped with a set of chemical batteries, which mainly use the chemical elements in the batteries as energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electrical energy is released for use, or transferred to places with a shortage of electricity for use.

[0036] 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 100 include:

[0037] (1) Large-scale energy storage power stations applied to wind power and photovoltaic power stations can assist renewable energy power generation in meeting grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power regulation power source on the power supply side, energy storage power stations can achieve load matching of power in time and space, enhance the absorption capacity of renewable energy, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy power generation, and are of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation.

[0038] (2) Energy storage containers applied on the grid side mainly function as peak shaving, frequency regulation and grid congestion relief. In terms of peak shaving, they can realize peak shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak electricity load period, thereby achieving a balance between power production and consumption.

[0039] (3) Small energy storage cabinets applied to the electricity consumption side mainly function as self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improvement of power supply reliability. Depending on the application scenario, electricity consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the electricity market implementing peak-valley pricing, by charging the energy storage system when the electricity price is low and discharging the energy storage system when the electricity price is high, peak-valley price arbitrage can be achieved, reducing electricity costs. In addition, industrial enterprises subject to two-part tariffs can use energy storage systems to store energy during off-peak hours and discharge during peak loads, thereby reducing peak power and the maximum demand declared, achieving the goal of reducing capacity charges. Household photovoltaics with energy storage can improve the level of self-consumption of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations is driven. Given that photovoltaic power generation occurs during the day, while user load is generally higher at night, configuring energy storage can better utilize photovoltaic power, improve self-consumption levels, and reduce electricity costs. Furthermore, energy storage is needed in areas such as communication base stations and data centers for backup power.

[0040] In some embodiments, see Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system 400 according to an embodiment of this application, and this application Figure 1 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device 100 of this application is not limited to its generation / distribution side energy storage scenario.

[0041] This application provides an energy storage system 400, which includes: a high-voltage cable 410, a first power conversion device 420, a second power conversion device 430, and an energy storage device 100 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 430 can be a wind power conversion device. Since the electricity generated by wind power conversion is volatile, random, and intermittent, the unstable electricity output by the wind power conversion device can be stored in the energy storage device 100 through grid connection. The energy storage device 100 is connected to the high-voltage cable 410 and outputs smooth electricity to the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and stable grid operation; or, wind power... The conversion device is always connected to the high-voltage cable 410. Under normal power generation conditions, the power output of the wind power conversion device is supplied to the power consumption side of the distribution network through the high-voltage cable. When the current power load is low and the wind power conversion device generates excess power, the excess power is first stored in the energy storage device 100 to reduce wind and solar curtailment rates and improve the problem of new energy power generation consumption. When the power load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 100 together with the high-voltage cable 410 in grid-connected mode to supply power to the power consumption side. This provides the power grid with various services such as peak shaving, frequency regulation, and backup, giving full play to the peak shaving role of the power grid, promoting peak shaving and valley filling, and alleviating the power supply pressure of the power grid.

[0042] In some embodiments on the distribution network side, the first power conversion device 420 can be a photovoltaic power conversion device. The energy storage device 100 is connected to the high-voltage cable 410 and installed downstream of the high-voltage cable 410 between the user load and the user load. The power output by the photovoltaic power conversion device is stored in the energy storage device 100, which can respond in a timely manner to act as a backup power source when the power grid / distribution network fails. Alternatively, it can provide power supply support to alleviate line congestion when the high-voltage cable 410 transmission line is blocked, and to delay the economic pressure caused by the expansion of the power grid / distribution capacity when the power grid is planned to be expanded.

[0043] Optionally, the first power conversion device may include, but is not limited to, a wind power conversion device, and the second power conversion device may include, but is not limited to, a photovoltaic power conversion device. The first power conversion device 420 and the second power conversion device 430 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0044] Optionally, the energy storage device 100 may include, but is not limited to, energy storage applications such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may also be applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0045] Optionally, the energy storage device 100 may include, but is not limited to, single-cell batteries, or battery modules, battery packs, battery clusters, mobile power supplies, energy storage cabinets, energy storage containers, and prefabricated energy storage cabins, etc., battery integrated systems. 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 uses a prefabricated energy storage cabin as an example for illustration.

[0046] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of an energy storage system 400 according to another embodiment of this application.

[0047] In this embodiment, the energy storage system 400 may include an energy storage device 100 and an energy storage converter 200, with the energy storage converter 200 electrically connected to the energy storage device 100. The energy storage device 100 can be a prefabricated energy storage module to store and release electrical energy, thereby balancing power supply and demand. The energy storage converter 200 is used to realize bidirectional power conversion and intelligent regulation between the energy storage system 400 and the power grid. Through AC / DC conversion, power control, and grid support functions, it ensures the stable operation of the power system and efficient energy utilization.

[0048] Please refer to the following: Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 3 yes Figure 2 The diagram shows the structure of the energy storage device 100 in the energy storage system 400. Figure 4 yes Figure 3 The schematic diagram of the energy storage box 110 in the energy storage device 100 shown is as follows. Figure 5 yes Figure 4 An enlarged schematic diagram of region A. For ease of description, the length direction of the energy storage device 100 is taken as the first direction X, the height direction of the energy storage device 100 is taken as the second direction Z, and the width direction of the energy storage device 100 is taken as the third direction Y. The first direction X, the second direction Z, and the third direction Y are arranged to intersect each other.

[0049] The energy storage device 100 provided in the embodiments of this application can be placed on a supporting surface. For example, when the energy storage device 100 is placed on the ground, the supporting surface can be the ground. In this embodiment, the energy storage device 100 includes an energy storage box 110, an adapter box 120, and an electrical connection cable 130. The adapter box 120 is installed on the side of the energy storage box 110. The electrical connection cable 130 is led out from the energy storage box 110 and the adapter box 120. The electrical connection cable 130 is used to connect the energy storage converter 200 and the energy storage device 100, so that the energy storage device 100 and the energy storage converter 200 are electrically connected.

[0050] Specifically, the energy storage box 110 includes a box body 10 and electronic components 20. The box body 10 has a receiving cavity 101, a first wiring hole 102, and a third mounting hole 103. The receiving cavity 101 is located inside the box body 10. The receiving cavity 101 can be used to accommodate the electronic components 20. The first wiring hole 102 penetrates the side of the box body 10 and the cavity wall of the receiving cavity 101 to communicate with the receiving cavity 101. The opening of the third mounting hole 103 is located on the side of the box body 10, and the third mounting hole 103 is spaced apart from the first wiring hole 102. For example, the third mounting hole 103 penetrates the side of the box body 10 and the cavity wall of the receiving cavity 101. In this embodiment, there are multiple third mounting holes 103. Multiple third mounting holes 103 are spaced apart around the opening of the receiving cavity 101. The electronic components 20 are located inside the receiving cavity 101. Among them, electronic components 20 can be components such as battery modules, battery management system sensors and controllers, so that the energy storage device 100 can store and release electrical energy.

[0051] Please refer to the following: Figure 2 and Figure 6 , Figure 6 yes Figure 3 The diagram shows the structure of the junction box 120 and the electrical connection line 130 in the energy storage device 100. Figure 6 Only the terminal 80 of the electrical connection line 130 is shown in the diagram.

[0052] In this embodiment, the adapter box 120 is installed on the side of the housing 10. Exemplarily, the adapter box 120 is detachably installed on the side of the housing 10. The adapter box 120 has a receiving cavity 121, a second cable passage hole 122, and a third cable passage hole 123. The receiving cavity 121 is located inside the adapter box 120. The second cable passage hole 122 penetrates the surface of the adapter box 120 facing the housing 10 and the cavity wall of the receiving cavity 121, and communicates with the first cable passage hole 102. The second cable passage hole 122 may completely overlap with the first cable passage hole 102, or it may partially overlap with the first cable passage hole 102; this application does not impose strict limitations on this. The third cable passage hole 123 penetrates the surface of the adapter box 120 facing the bearing surface and the cavity wall of the receiving cavity 121. Exemplarily, there are two third cable passage holes 123. Along the first direction X, the two third cable passage holes 123 are spaced apart.

[0053] Electrical connection cable 130 is electrically connected between electronic component 20 and energy storage converter 200. Specifically, one end of electrical connection cable 130 is electrically connected to electronic component 20. The other end of electrical connection cable 130 passes through the first wire through hole 102, the second wire through hole 122, the receiving cavity 121, and the third wire through hole 123, so that electrical connection cable 130 is led out of adapter box 120 and electrically connected to energy storage converter 200, thereby achieving electrical connection between electronic component 20 in energy storage box 110 and energy storage converter 200. In this embodiment, electrical connection cable 130 has a connected wire harness (not shown in the figure) and terminal block 80. One end of the wire harness of electrical connection cable 130 is fixed to electronic component 20 through terminal block 80 and is electrically connected to electronic component 20. The other end of the wire harness of electrical connection cable 130 is fixed to energy storage converter 200 through terminal block 80 and is electrically connected to energy storage converter 200.

[0054] In this embodiment, the electrical connection cable 130 exits the receiving cavity 101 of the housing 10 from the first cable pass 102, passes through the second cable pass 122 into the receiving cavity 121 of the adapter box 120, and then exits the adapter box 120 from the third cable pass 123. During this process, the outgoing direction of the electrical connection cable 130 changes from the first direction X to the second direction. It can be understood that by adding the adapter box 120 to the side of the housing 10 of the energy storage box 110, the user's requirement for the electrical connection cable 130 of the energy storage device 100 to exit from the side of the energy storage device 100 and then from the bottom can be met. This makes it convenient for the user to connect the electrical connection cable 130 to the energy storage converter 200, and can greatly solve the problem of difficulty in directly wiring the energy storage device 100 and the energy storage converter 200. Meanwhile, the adapter box 120 is detachably connected to the side of the enclosure 10. When the user only needs the electrical connection cable 130 to exit from the side of the energy storage device 100, the adapter box 120 can be removed. At this time, the electrical connection cable 130 can be directly led out from the first cable hole 102 of the enclosure 10, thus meeting the user's requirement for the electrical connection cable 130 to exit from the side of the energy storage device 100. Compared with the prior art, where the electrical connection cable 130 can only be selected to exit from the side or bottom of the energy storage device 100, the energy storage device 100 provided in this application can provide both a cable exit scheme where the electrical connection cable 130 is led out from the side to the bottom of the energy storage device 100 and a cable exit scheme where the electrical connection cable 130 is directly led out from the side of the energy storage device 100. This provides more optional configurations for the product and allows users to have a variety of optional customized cable exit schemes to meet the different cable exit requirements of the electrical connection cable 130 of the energy storage device 100 in different usage scenarios.

[0055] In this embodiment, there are multiple electrical connection wires 130. These multiple electrical connection wires 130 include a positive electrical connection wire 130a and a negative electrical connection wire 130b. The positive electrical connection wire 130a passes through a third wire through hole 123 to lead out of the adapter box 120. The negative electrical connection wire 130b passes through another third wire through hole 123 to lead out of the adapter box 120. This arrangement allows the positive and negative electrical connection wires 130a and 130b to be separated, facilitating the user's subsequent correct connection of the electrical connection wires 130 to the positive and negative terminals of the energy storage converter 200.

[0056] The specific structure of the adapter box 120 will be described below.

[0057] Please refer to the following: Figure 7 , Figure 8 , Figure 9 and Figure 10 , Figure 7 yes Figure 3 The schematic diagram of the junction box 120 in the energy storage device 100 is shown. Figure 8 yes Figure 7 The diagram shows the structure of the adapter box 120 from another angle. Figure 9 yes Figure 8 The exploded view of the adapter box 120 shown is shown. Figure 10 yes Figure 9 A partial structural diagram of the box body 30 in the adapter box 120 shown.

[0058] In this embodiment, the adapter box 120 is further provided with a first through hole 124 and a second through hole 125. The first through hole 124 penetrates the surface of the adapter box 120 away from the housing 10 and the cavity wall of the receiving cavity 121. Along the first direction X, the first through hole 124 is located on the side of the receiving cavity 121 away from the second cable pass hole 122. The second through hole 125 penetrates the surface of the adapter box 120 away from the bearing surface and the cavity wall of the receiving cavity 121. Along the second direction Z, the second through hole 125 is located on the side of the receiving cavity 121 away from the third cable pass hole 123.

[0059] The adapter box 120 includes a box body 30, a wiring assembly 40, a warning label 50, and a third seal 60. The wiring assembly 40 is installed inside the box body 30. The warning label 50 is located on the outer surface of the box body 30. The third seal 60 is installed on the side of the box body 30 facing the housing 10 and is used to seal the connection between the box body 30 and the housing 10.

[0060] Specifically, the housing 30 is mounted on the side of the box 10. The housing 30 includes a main body 31, a flange 32, a first cover plate 33, a first sealing part 34, a second cover plate 35, and a second sealing part 36. The main body 31 is provided with the aforementioned second wire passage hole 122, third wire passage hole 123, receiving cavity 121, first through hole 124, and second through hole 125. The main body 31 also provides a first fixing hole 311 and a second fixing hole 312. The opening of the first fixing hole 311 is located on the surface of the main body 31 facing away from the box 10. For example, the first fixing hole 311 penetrates the surface of the main body 31 facing away from the box 10 and the cavity wall of the receiving cavity 121. Along the first direction X, the first through hole 124 is located on the side of the receiving cavity 121 facing away from the second wire passage hole 122 and is spaced apart from the first through hole 124. For example, there are multiple first fixing holes 311. Multiple first fixing holes 311 are spaced apart around the first through hole 124. The opening of a second fixing hole 312 is located on the surface of the main body 31 facing away from the bearing surface. For example, the second fixing hole 312 penetrates both the surface of the main body 31 facing away from the bearing surface and the cavity wall of the receiving cavity 121. Along the second direction Z, the second fixing hole 312 is located on the side of the receiving cavity 121 facing away from the third wire-passing hole 123 and is spaced apart from the second through hole 125. For example, there are multiple second fixing holes 312. Multiple second fixing holes 312 are spaced apart around the second through hole 125.

[0061] The flange portion 32 is fixedly connected to the side of the main body portion 31 facing the housing 10 and is arranged around the second wire passage hole 122. The flange portion 32 is provided with a third fixing hole 321, which penetrates the flange portion 32 along its thickness direction (first direction X in the figure). The third fixing hole 321 communicates with the third mounting hole 103 of the housing 10. For example, there are multiple third fixing holes 321. The multiple third fixing holes 321 are arranged at intervals around the second wire passage hole 122. Each third fixing hole 321 corresponds to and communicates with a third mounting hole 103 of the housing 10.

[0062] Please refer to the following: Figure 8 and Figure 11 , Figure 11 yes Figure 9 The diagram shows the structure of the first cover plate 33 and the first sealing part 34 in the adapter box 120.

[0063] The first cover plate portion 33 is mounted on the side of the main body portion 31 of the housing 30 opposite to the box body 10, and covers the first through hole 124. The first cover plate portion 33 is provided with a first mounting hole 331. The first mounting hole 331 penetrates the first cover plate portion 33 along the thickness direction (first direction X in the figure). For example, there are multiple first mounting holes 331. The multiple first mounting holes 331 are spaced apart from each other. Each first mounting hole 331 communicates with a first fixing hole 311 of the main body portion 31.

[0064] The first sealing part 34 is sealingly connected between the first cover plate part 33 and the main body part 31 of the box body 30, and is disposed around the first through hole 124. The first sealing part 34 is provided with a first mating hole 341, which penetrates the first sealing part 34 along the thickness direction (first direction X in the figure). The first mating hole 341 communicates with both the first mounting hole 331 of the first cover plate part 33 and the first fixing hole 311 of the box body 30. For example, there are multiple first mating holes 341. The multiple first mating holes 341 are spaced apart from each other. Each first mating hole 341 communicates with one first mounting hole 331 and one first fixing hole 311.

[0065] In addition, the housing 30 also includes a first fastener 37. The first fastener 37 is used to fix the first cover plate portion 33, the first sealing portion 34, and the main body portion 31 of the housing 30. The first fastener 37 passes through the first mounting hole 331 of the first cover plate portion 33, the first mating hole 341 of the first sealing portion 34, and the first fixing hole 311 of the main body portion 31, and is fixed to the main body portion 31. For example, the first fastener 37 is a combination bolt. Here, "combination bolt" refers to a combination component consisting of a bolt, nut, and washer, and the following similar description can be understood in the same way. For example, the nut can be an M5 blind hole rivet nut.

[0066] In this embodiment, there are multiple first fasteners 37. Each first fastener 37 passes through a first mounting hole 331, a first mating hole 341, and a first fixing hole 311, and is fixed to the housing 30. Alternatively, the first sealing part 34 can be first adhered to the surface of the main body 31 facing away from the housing 10 using adhesive, and then the first fasteners 37 can be used to fix the first cover plate 33, the first sealing part 34, and the main body 31, so that the first sealing part 34 achieves a sealing connection between the first cover plate 33 and the housing 30. Alternatively, the first fasteners 37 can be used directly to fix the first cover plate 33, the first sealing part 34, and the housing 30.

[0067] It is understandable that by providing a first sealing part 34 and sealingly connecting the first sealing part 34 between the first cover plate part 33 and the main body part 31 of the box body 30, the first sealing part 34 is compressed during the installation of the first cover plate part 33 onto the main body part 31 of the box body 30. This can seal the gap between the main body part 31 of the box body 30 and the first cover plate part 33, improving the sealing performance between the first cover plate part 33 and the main body part 31 of the box body 30. This can prevent dust and moisture from the external environment from entering the interior of the adapter box 120, and prevent components inside the adapter box 120 from failing due to contamination or corrosion, thereby helping to extend the service life of the adapter box 120.

[0068] Please see Figure 8 and Figure 12 , Figure 12 yes Figure 9 The diagram shows the structure of the second cover plate 35, the second sealing part 36, and the warning sign 50 in the adapter box 120.

[0069] The second cover plate portion 35 is mounted on the side of the main body portion 31 opposite to the bearing surface and covers the second through hole 125. The second cover plate portion 35 is provided with a second mounting hole 351. The second mounting hole 351 extends through the second cover plate portion 35 along the thickness direction (second direction Z in the figure). For example, there are multiple second mounting holes 351. The multiple second mounting holes 351 are spaced apart from each other. Each second mounting hole communicates with a second fixing hole 312 of the housing 30.

[0070] The second sealing part 36 is sealingly connected between the second cover plate part 35 and the main body part 31 of the housing 30, and is disposed around the second through hole 125. The second sealing part 36 is provided with a second mating hole 361, which penetrates the second sealing part 36 along its thickness direction (second direction Z in the figure). The second mating hole 361 communicates with both the second mounting hole 351 of the second cover plate part 35 and the second fixing hole 312 of the main body part 31. For example, there are multiple second mating holes 361. The multiple second mating holes 361 are spaced apart from each other. Each second mating hole 361 communicates with one second mounting hole 351 and one second fixing hole 312.

[0071] In addition, the housing 30 also includes a second fastener 38. The second fastener 38 is used to fix the second cover plate portion 35, the second sealing portion 36, and the main body portion 31 of the housing 30. The second fastener 38 passes through the second mounting hole 351 of the second cover plate portion 35, the second mating hole 361 of the second sealing portion 36, and the second fixing hole 312 of the main body portion 31, and is fixed to the main body portion 31 of the housing 30. For example, the second fastener 38 is a combination bolt. In this embodiment, there are multiple second fasteners 38. Each second fastener 38 passes through a second mounting hole 351, a second mating hole 361, and a second fixing hole 312, and is fixed to the main body portion 31 of the housing 30. In this method, the second sealing part 36 can be first attached to the side of the main body 31 away from the bearing surface using adhesive, and then the second cover part 35, the second sealing part 36, and the main body 31 of the box body 30 can be fixed using the second fastener 38, so that the second sealing part 36 achieves a sealing connection between the second cover part 35 and the main body 31. Alternatively, the second fastener 38 can be used directly to fix the second cover part 35, the second sealing part 36, and the main body 31 of the box body 30.

[0072] It is understandable that by providing a second sealing part 36 and sealingly connecting the second sealing part 36 between the second cover part 35 and the main body part 31 of the box body 30, the second sealing part 36 is compressed during the installation of the second cover part 35 to the main body part 31. This can seal the gap between the second cover part 35 and the main body part 31 of the box body 30, improve the sealing performance between the second cover part 35 and the main body part 31 of the box body 30, prevent dust and moisture from entering the interior of the adapter box 120, thereby further improving the waterproof and dustproof performance of the adapter box 120, preventing the internal components of the adapter box 120 from failing due to pollution or corrosion, and thus helping to extend the service life of the adapter box 120.

[0073] Please continue reading. Figure 8 and Figure 12 The warning label 50 is affixed to the outer surface of the housing 30. Specifically, the warning label 50 is located on the surface of the second cover portion 35 opposite to the main body portion 31 of the housing 30. In this embodiment, by setting the warning label 50 on the surface of the second cover portion 35 opposite to the main body portion 31, the user can be reminded to pay attention to electrical safety, thereby helping to protect the user's personal safety. In other embodiments, the warning label 50 may also be located on the outer surface of the main body portion 31 or on the surface of the first cover portion 33 opposite to the main body portion 31, as long as it serves to warn the user.

[0074] Please refer to the following: Figure 8 and Figure 13 , Figure 13 yes Figure 9 A schematic diagram of the structure of the third seal 60 and the third fastener 70 in the adapter box 120 shown.

[0075] In this embodiment, the third sealing member 60 is used to seal the connection between the flange portion 32 of the housing 30 and the box body 10. The third sealing member 60 is provided with a third mating hole 61, which penetrates the third sealing member 60 along its thickness direction (first direction X in the figure). The third mating hole 61 communicates with both the third fixing hole 321 of the flange portion 32 and the third mounting hole 103 of the box body 10. For example, there are multiple third mating holes 61. The multiple third mating holes 61 are spaced apart from each other. Each third mating hole 61 communicates with one third mounting hole 103 and one third fixing hole 321.

[0076] In addition, the adapter box 120 also includes a third fastener 70. The third fastener 70 is used to fix the flange portion 32, the third seal 60, and the housing 10 of the box body 30. The third fastener 70 passes through the third fixing hole 321 of the flange portion 32, the third mating hole 61 of the third seal 60, and the third mounting hole 103 of the housing 10, and is fixed to the housing 10. For example, the third fastener 70 is a combination bolt. In this embodiment, there are multiple third fasteners 70. Each third fastener 70 passes through a third fixing hole 321, a third mating hole 61, and a third mounting hole 103, and is fixed to the housing 10. The third seal 60 can be first attached to the side of the flange portion 32 facing the housing 10 using adhesive, and then the flange portion 32, the third seal 60, and the housing 10 of the box body 30 can be fixed using the third fastener 70, so that the third seal 60 achieves a sealing connection between the flange portion 32 and the housing 10 of the box body 30. Alternatively, the flange 32, the third seal 60, and the housing 10 of the box body 30 can be directly secured using the third fastener 70.

[0077] Understandably, by setting a third seal 60 and sealing it between the flange 32 of the housing 30 and the box 10, the third seal 60 is compressed during the installation of the adapter box 120 into the box 10. This seals the gap between the flange 32 of the housing 30 and the box 10, improving the sealing performance between the adapter box 120 and the box 10. This prevents dust and moisture from entering the energy storage device 100, enhancing its waterproof and dustproof performance. Consequently, it prevents internal components of the energy storage device 100 from failing due to contamination or corrosion, thus helping to extend the service life of the energy storage device 100.

[0078] Furthermore, by using the first sealing part 34, the second sealing part 36, and the third sealing element 60 in combination, the adapter box 120 can meet the preset protection level requirements, thereby enhancing the waterproof and dustproof effect of the adapter box 120 and thus helping to improve the reliability of the energy storage device 100. For example, the protection level of the adapter box 120 provided in this application is IP55. Among them, the first digit "5" of "IP55" represents limited dust protection, which can prevent solid foreign objects with a diameter greater than or equal to 1 mm from entering the adapter box 120, and the second digit "5" represents water spray protection, which can resist low-pressure water jets from any direction.

[0079] Please refer to the following: Figure 14 , Figure 15 and Figure 16 , Figure 14 yes Figure 9 The diagram shows the structure of the main body 31 and the wiring assembly 40 in the adapter box 120. Figure 15 It is an electrical connection cable 130 and Figure 14 The diagram shows the structure of the wiring assembly 40. Figure 16 It is an electrical connection cable 130 and Figure 14 The diagram shows the structure of the wiring assembly 40 from another angle. Figure 15 and Figure 16 Only the wiring terminals 80 of the first wiring harness segment 131 and the second wiring harness segment 132 are shown in the diagram.

[0080] In this embodiment, the wiring assembly 40 is installed within the receiving cavity 121. Specifically, the wiring assembly 40 includes a fixing bracket 41, a first insulating post 42, a second insulating post 43, and an adapter 44, all installed within the receiving cavity 121. The fixing bracket 41 is made of metal. The fixing bracket 41 is connected to the cavity wall of the receiving cavity 121 of the housing 30. The first insulating post 42 and the second insulating post 43 are both installed on the fixing bracket 41 and are spaced apart from each other. The adapter 44 is installed at the end of the first insulating post 42 and the second insulating post 43 opposite to the fixing bracket 41.

[0081] Specifically, the fixing bracket 41 includes two welding parts 411, a connecting part 412, a first fixing part 413, and a second fixing part 414. Both welding parts 411 are welded to the cavity wall of the receiving cavity 121 to fix them to the main body 31 of the box body 30. The two welding parts 411 are spaced apart and opposite to each other along the third direction Y. The connecting part 412 is fixedly connected between the two welding parts 411. The first fixing part 413 is fixedly connected to the cavity wall of the receiving cavity 121 and extends within the receiving cavity 121 towards the second wire hole 122. Specifically, the first fixing part 413 is fixedly connected to the connecting part 412. In this configuration, the first fixing part 413 is fixed to the cavity wall of the receiving cavity 121 via the connecting part 412 and the welding part 411, thereby fixing it to the main body 31 of the box body 30. The second fixing part 414 is fixedly connected to the first fixing part 413 on the side opposite to the second wire hole 122, and extends in the receiving cavity 121 toward the third wire hole 123.

[0082] In this embodiment, the first insulating post 42 is mounted on the first fixing part 413 of the fixing bracket 41. Exemplarily, the first insulating post 42 can be assembled with the first fixing part 413 of the fixing bracket 41 using fasteners such as through-hole M10 hexagonal nuts. In this embodiment, there are multiple first insulating posts 42. Multiple first insulating posts 42 are spaced apart along the Y-direction. The second insulating post 43 is mounted on the second fixing part 414 of the fixing post. Exemplarily, the second insulating post 43 can be assembled with the second fixing part 414 of the fixing bracket 41 using fasteners such as through-hole M10 hexagonal nuts. In this embodiment, there are multiple second insulating posts 43. Multiple second insulating posts 43 are spaced apart along the Y-direction.

[0083] In this embodiment, the adapter 44 is a copper busbar. For example, the adapter 44 is generally L-shaped. The adapter 44 is used to connect to the electrical connection wire 130 to change the outgoing direction of the electrical connection wire 130. Specifically, the adapter 44 includes a first adapter portion 441 and a second adapter portion 442. The first adapter portion 441 is mounted on the end of the first insulating post 42 away from the first fixing portion 413 of the fixing bracket 41, and extends within the receiving cavity 121 in the direction of the second wire passage hole 122 (illustrated in the first direction X). The second adapter portion 442 is mounted on the end of the second insulating post 43 away from the second fixing portion 414, and is fixedly connected to the end of the first adapter portion 441 away from the second wire passage hole 122, and extends within the receiving cavity 121 in the direction of the third wire passage hole 123 (illustrated in the second direction Z).

[0084] It is understandable that, since both the fixed bracket 41 and the adapter 44 are made of metal, by setting the first insulating post 42 and the second insulating post 43 between the adapter 44 and the fixed bracket 41, the adapter 44 can be insulated from the fixed bracket 41, thereby avoiding short circuit problems caused by direct contact between the adapter 44 and the fixed bracket 41, which helps to improve the reliability of the energy storage device 100.

[0085] Furthermore, at least a portion of the first adapter portion 441 is disposed opposite to the second through hole 125 of the housing 30 to facilitate the user's installation and fixing of the electrical connection cable 130 on the first adapter portion 441. For example, the electrical connection cable 130 can be fixed to the first adapter portion 441 using combination bolts. At least a portion of the second adapter portion 442 is disposed opposite to the first through hole 124 of the housing 30 to facilitate the user's installation of the electrical connection cable 130 on the second adapter portion 442. For example, the electrical connection cable 130 can be fixed to the second adapter portion 442 using combination bolts.

[0086] In this embodiment, there are multiple adapters 44. The multiple adapters 44 include a positive adapter 44a and a negative adapter 44b. Along the first direction X, the positive adapter 44a and the negative adapter 44b are spaced apart. Along the second direction Z, the positive adapter 44a and the negative adapter 44b are staggered. The positive adapter 44a is used for electrical connection to the positive electrical connection line 130a of the energy storage device 100, and the negative adapter 44b is used for electrical connection to the negative electrical connection line 130b of the energy storage device 100. In addition, the first adapter portion 441 of the positive adapter 44a is marked with a "+" symbol, and the first adapter portion 441 of the negative adapter 44b is marked with a "-" symbol, so as to facilitate accurate identification by operators when installing the positive electrical connection wire 130a and the negative electrical connection wire 130b, thereby helping to improve the installation efficiency of the electrical connection wire 130 of the energy storage device 100.

[0087] Please continue reading. Figures 13 to 15In this embodiment, there are two wiring assemblies 40. Both wiring assemblies 40 are located within the receiving cavity 121. Along the first direction X, the two wiring assemblies 40 are spaced apart. Along the second direction Z, the two wiring assemblies 40 are staggered. One wiring assembly 40 includes the aforementioned positive electrode adapter 44a and is used to install the positive electrode electrical connection line 130a of the energy storage device 100. The other wiring assembly 40 includes the aforementioned negative electrode adapter 44b and is used to install the negative electrode electrical connection line 130b of the energy storage device 100.

[0088] Please refer to the following: Figure 2 , Figure 14 and Figure 15 In this embodiment, the electrical connection wire 130 includes a first wire harness segment 131 and a second wire harness segment 132. Both the first wire harness segment 131 and the second wire harness segment 132 have the aforementioned wire harness and terminal block 80. Specifically, the first wire harness segment 131 passes through the first wire through hole 102 and the second wire through hole 122, and is electrically connected between the electronic component 20 and the first adapter portion 441. Specifically, the wire harness of the first wire harness segment 131 is electrically connected to the electronic component 20 and the first adapter portion 441 through the terminal block 80 of the first wire harness segment 131. The second wire harness segment 132 is electrically connected to the second adapter portion 442 and passes through the third wire through hole 123. Specifically, the wire harness of the second wire harness segment 132 is electrically connected to the electronic component 20 and the second adapter portion 442 through the terminal block 80 of the second wire harness segment 132.

[0089] It is understandable that by connecting the first wire harness segment 131 to the first adapter 441 and the second wire harness segment 132 to the second adapter 442, since the extension directions of the first adapter 441 and the second adapter 442 are different, the first wire harness segment 131 and the second wire harness segment 132 can achieve the conversion of the outgoing direction through the adapter 44, so that the electrical connection line 130 can be outgoing from the bottom of the energy storage device 100, thereby making it convenient for users to connect the electrical connection line 130 to the energy storage converter 200, which can greatly solve the problem of difficulty in directly wiring the energy storage device 100 and the energy storage converter 200.

[0090] Specifically, the first harness segment 131 of the positive electrode connecting wire 130a is electrically connected between the electronic component 20 and the first adapter portion 441 of the positive electrode adapter 44a. The second harness segment 132 of the positive electrode connecting wire 130a is electrically connected to the second adapter portion 442 of the positive electrode adapter 44a. Each second harness segment 132 of the positive electrode connecting wire 130a passes through a third wire through hole 123. The first harness segment 131 of the negative electrode connecting wire 130b is electrically connected between the electronic component 20 and the first adapter portion 441 of the negative electrode adapter 44b. The second harness segment 132 of the negative electrode connecting wire 130b is electrically connected to the second adapter portion 442 of the negative electrode adapter 44b. Each second harness segment 132 of the negative electrode connecting wire 130b passes through another third wire through hole 123.

[0091] This configuration separates the first wiring harness segment 131 of the positive electrical connection line 130a and the first wiring harness segment 131 of the negative electrical connection line 130b of the energy storage device 100, and also separates the second wiring harness segment 132 of the positive electrical connection line 130a and the second wiring harness segment 132 of the negative electrical connection line 130b. This prevents the positive electrical connection line 130a and the negative electrical connection line 130b from getting mixed up during the wiring process, thereby avoiding problems such as short circuits in the output wiring of the energy storage device 100 due to wiring errors, and helps to ensure the good reliability and safety of the energy storage device 100.

[0092] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An energy storage device for placement on a load bearing surface, characterized in that, The energy storage device includes an energy storage box, an adapter box, and electrical connection wires. The energy storage box includes a box body and electronic components. The box body has a receiving cavity and a first wire passage hole. The receiving cavity is located inside the box body. The first wire passage hole penetrates the side of the box body and the cavity wall of the receiving cavity. The electronic components are located inside the receiving cavity. The adapter box is installed on the side of the box body. The adapter box has a receiving cavity, a second wire passage hole, and a third wire passage hole. The receiving cavity is located inside the adapter box. The second wire passage hole penetrates the surface of the adapter box facing the box body and the cavity wall of the receiving cavity, and communicates with the first wire passage hole. The third wire passage hole penetrates the surface of the adapter box facing the bearing surface and the cavity wall of the receiving cavity. The adapter box includes a fixed bracket, a first insulating post, a second insulating post, and an adapter. The fixed bracket, the first insulating post, and the second insulating post are all located within the receiving cavity. The fixed bracket includes a first fixing part and a second fixing part. The first fixing part is fixedly connected to the cavity wall of the receiving cavity and extends within the receiving cavity towards the second wire passage hole. The second fixing part is fixedly connected to the side of the first fixing part away from the second wire passage hole and extends within the receiving cavity towards the third wire passage hole. The first insulating post is installed on the first fixing part, and the second insulating post is installed on the second fixing part. The adapter is disposed within the receiving cavity and includes a first adapter part and a second adapter part. The first adapter part is installed on the end of the first insulating post away from the first fixing part and extends within the receiving cavity towards the second wire passage hole. The second adapter part is fixedly connected to the end of the first adapter part away from the second wire passage hole and is installed on the end of the second insulating post away from the second fixing part, extending within the receiving cavity towards the third wire passage hole. The electrical connection wire includes a first wire harness segment and a second wire harness segment. The first wire harness segment passes through the first wire through hole and the second wire through hole and is electrically connected between the electronic component and the first adapter. The second wire harness segment is electrically connected to the second adapter and passes through the third wire through hole.

2. The energy storage device of claim 1, wherein, The adapter is a plurality of such adapters, including a positive adapter and a negative adapter. Along a first direction, the positive adapter and the negative adapter are spaced apart. Along a second direction, the positive adapter and the negative adapter are staggered. The second direction intersects with the first direction. There are multiple electrical connection wires, including positive and negative electrical connection wires. The first wire harness segment of the positive electrical connection wire is electrically connected between the electronic component and the first adapter portion of the positive adapter. The second wire harness segment of the positive electrical connection wire is electrically connected to the second adapter portion of the positive adapter. The first wire harness segment of the negative electrical connection wire is electrically connected between the electronic component and the first adapter portion of the negative adapter. The second wire harness segment of the negative electrical connection wire is electrically connected to the second adapter portion of the negative adapter.

3. The energy storage device of claim 2, wherein, There are two third wire-passing holes, which are spaced apart along the first direction; The second wire harness segment of the positive electrode electrical connection wire passes through one of the third wire through holes, and the second wire harness segment of the negative electrode electrical connection wire passes through another of the third wire through holes.

4. The energy storage device of claim 1, wherein, The adapter box is also provided with a first through hole, which penetrates the surface of the adapter box away from the housing and the cavity wall of the receiving cavity. The first through hole is located on the side of the receiving cavity away from the second wire hole. At least a portion of the second adapter part is disposed opposite to the first through hole.

5. The energy storage device of claim 4, wherein, The adapter box further includes a main body, a first cover plate, and a first sealing part. The main body is provided with the receiving cavity, the second wire passage hole, the third wire passage hole, and the first through hole. The first cover plate covers the first through hole, and the first sealing part is arranged around the first through hole and is sealed between the first cover plate and the main body.

6. The energy storage device according to claim 1, characterized in that, The adapter box is also provided with a second through hole, which penetrates the surface of the adapter box away from the bearing surface and the cavity wall of the receiving cavity. The second through hole is located on the side of the receiving cavity away from the third wire hole. At least a portion of the first adapter part is disposed opposite to the second through hole.

7. The energy storage device according to claim 6, characterized in that, The adapter box further includes a main body, a second cover plate, and a second sealing part. The main body is provided with the receiving cavity, the second wire passage hole, the third wire passage hole, and the second through hole. The second cover plate covers the second through hole, and the second sealing part is arranged around the second through hole and is sealed between the second cover plate and the main body.

8. An energy storage system, characterized in that, It includes an energy storage converter and an energy storage device as described in any one of claims 1 to 7, wherein the energy storage converter is electrically connected to the energy storage device.

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