Energy storage device and energy storage system

Abstract

The utility model provides an energy storage device and an energy storage system.The energy storage device comprises a battery cell and a first shell, the first shell comprises a first bottom wall, a first end plate, an extending part and a grabbing component, the first bottom wall and the first end plate are suitable for defining a containing space, the containing space is suitable for at least containing part of the battery cell, one side of the first end plate is connected with the bottom wall, and the other side of the first end plate is connected with the extending part; the first extending part extends from the other side of the first end plate to the outside of the containing space, and the grabbing component is fixed to the first extending part. The energy storage device is provided with the grasping component at the extension part, so that the energy storage device is more suitable for being moved, and the portability of the energy storage device is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to an energy storage device and an energy storage system. Background Art

[0002] With the adjustment of the global energy structure, new energy technologies are booming. Electrochemical energy storage systems are widely used in the power grid's power generation, transmission and user sides to achieve peak shaving, peak and frequency regulation, voltage support and relief of line congestion.

[0003] At present, with the gradual increase in battery energy density, energy storage devices are developing in the direction of miniaturization and lightness. However, light and thin energy storage devices usually integrate multiple battery cells, which are heavy and inconvenient to move and install. Utility Model Content

[0004] The present application provides an energy storage device and an energy storage system, which can increase the portability of the energy storage equipment.

[0005] A first aspect of the present application provides an energy storage device, which includes a battery cell; a first shell, the first shell including: a first bottom wall; a first end plate, the first bottom wall and the first end plate are suitable for defining a accommodating space, the accommodating space is suitable for accommodating at least part of the battery cell, wherein one side of the first end plate is connected to the bottom wall; an extension portion, the first extension portion extends from the other side of the first end plate to the outside of the accommodating space; and a gripping member, the gripping member is fixed to the first extension portion.

[0006] In a possible implementation manner of the first aspect, the extending portion includes: a first extending portion, the first area of ​​which is suitable for forming a sealing area; and a second extending portion, the second area of ​​which is suitable for fixing the gripping member.

[0007] In a possible implementation manner of the first aspect, the gripping member includes: a mounting portion, the mounting portion being adapted to be fixedly connected to the second extending portion; and a gripping portion, the gripping portion being adapted to be gripped by a human hand to move the shell.

[0008] In a possible implementation manner of the first aspect, the gripping portion includes a gripping hole or a gripping rod.

[0009] In a possible implementation manner of the first aspect, two of the gripping members are fixedly provided at intervals on the extending portion.

[0010] In a possible implementation of the first aspect, the first bottom wall further includes: a second surface, the second surface is arranged opposite to the first surface of the first bottom wall, the second surface of the first bottom wall is provided with a reinforcement structure, and the reinforcement structure is suitable for strengthening the rigidity of the shell.

[0011] In a possible implementation manner of the first aspect, the reinforcement structure includes: a first reinforcement rib, wherein the first reinforcement rib extends along a length direction of the shell, or the first reinforcement rib extends along a width direction of the shell.

[0012] In a possible implementation of the first aspect, the energy storage device also includes: a second shell, the second shell is suitable for being snapped together with the first shell, the second shell includes a second bottom wall, the second bottom wall has a third surface and a fourth surface arranged opposite to each other, the third surface of the second bottom wall and the first surface of the first bottom wall are suitable for defining the accommodating space, and the accommodating space is suitable for accommodating the battery cell; a second reinforcement structure, the second reinforcement structure is arranged on at least one of the third surface and the fourth surface, and the second reinforcement structure is suitable for strengthening the rigidity of the second shell.

[0013] In a possible implementation of the first aspect, the shell assembly also includes: a first end plate; and a second end plate, the first end plate and the second end plate are arranged on the first surface of the first shell at intervals along the second direction of the shell, and the first end plate and the second end plate and the first surface of the first shell are suitable for defining the accommodating space.

[0014] In a possible implementation of the first aspect, the shell assembly further includes: a first side plate, the first side plate extending on the first surface in a direction away from the first surface, the first side plate being connected to the same side end portions of the first end plate and the second end plate.

[0015] In a possible implementation manner of the first aspect, the first side plate is provided with a notch, and a projection of a pole of the battery cell along a first direction is located within a projection of the notch along the first direction.

[0016] In a possible implementation of the first aspect, the first shell further includes: a second side plate and a third side plate, the second side plate and the third side plate are arranged on one side of the inner wall of the first shell, the second side plate and the third side plate are respectively connected to the same side ends of the first end plate and the second end plate, and a gap is arranged between the first side plate and the second side plate along the second direction.

[0017] In a possible implementation manner of the first aspect, a gap is provided between the first side plate and the second side plate along the width direction, and a projection of a pole of the battery cell along the first direction is located within a projection of the gap along the first direction.

[0018] In a possible implementation manner of the first aspect, the housing assembly further includes: a fixing frame, the fixing frame extending along the inner wall in a direction away from the inner wall, and limiting structures are provided at both ends of the fixing frame.

[0019] The second aspect of the present application further provides an energy storage system, which includes an energy storage device and an electrical device, wherein the energy storage device is electrically connected to the electrical device, and the energy storage device is such as the energy storage device in the above-mentioned first aspect and any possible implementation of the first aspect.

[0020] The present application provides an energy storage device and an energy storage system, wherein the energy storage device comprises a battery cell and a first shell, wherein the first shell comprises a first bottom wall, a first end plate, an extension portion and a gripping member, wherein the first bottom wall and the first end plate are adapted to define a housing space, wherein the housing space is adapted to accommodate at least part of the battery cell, wherein one side of the first end plate is connected to the bottom wall, the first extension portion extends from the other side of the first end plate to the outside of the housing space, and the gripping member is fixed to the first extension portion. The energy storage device is provided with a gripping member at the extension portion, so that the energy storage device is more suitable for being moved, thereby increasing the portability of the energy storage device.

[0021] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0023] Figure 1 is an axonometric view of a housing of an embodiment of the present application;

[0024] Figure 2 is an exploded diagram of an energy storage device according to an embodiment of the present application;

[0025] Figure 3 is a schematic diagram of the positional relationship between the housing and the pole in an embodiment of the present application;

[0026] Figure 4 is a left side view of the energy storage device of an embodiment of the present application;

[0027] Figure 5 yes Figure 4 A partial cross-sectional view of the C position shown in FIG.

[0028] Figure 6 is an axonometric view of a housing of another embodiment of the present application;

[0029] Figure 7 It is a schematic view of another embodiment of the present application.

[0030] Description of reference numerals:

[0031] 1. First shell; 101. Bottom wall; 102. First end plate; 103. Second end plate; 104. Gap; 105. Second side plate; 106. First side edge; 107. Third side plate; 108. Second side edge; 109. First edge; 110. Second edge; 111. First side plate; 2. Second shell; 201. Top wall; 202. Third side wall; 3. Battery; 301. Battery cell; 302. Post; 4. Welding mechanism; 5. Waterproof rubber strip; 6. Nut; 7. Screw; 8. Bus; 9. Connecting piece; 100. Extension; 200. Gripping member. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0033] The terms "first", "second" and corresponding terminology numbers in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances. This is merely a way of distinguishing objects with the same properties when describing the embodiments of the present application. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, so that a process, method, system, product or device that includes a series of units is not necessarily limited to those units, but may include other units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0034] In the description of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of this application, "at least one" refers to one or more items, and "multiple items" refers to two or more items. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0035] Combine the following Figures 1 to 7 The accompanying drawings provide a detailed description of the energy storage device and energy storage system provided by the present application.

[0036] First, the present application provides an energy storage device, which includes a battery cell and a first shell, the first shell including: a first bottom wall; a first end plate, the first bottom wall and the first end plate are suitable for defining a accommodating space, the accommodating space is suitable for accommodating at least part of the battery cell, wherein one side of the first end plate is connected to the bottom wall; an extension portion, the extension portion extends from the other side of the first end plate to the outside of the accommodating space; and a gripping member, the gripping member is fixed to the first extension portion.

[0037] In the embodiment of the present application, the first shell includes a first bottom wall, a first end plate, an extension portion, and a gripping member. The components included in the first shell may be integrally formed or assembled in a detachable manner. For example, the first bottom wall and the first end plate may be integrally formed parts produced by a casting process or a sheet metal process, or the first bottom wall and the first end plate may be two separate components assembled together. There are many ways to produce the first shell in the present application, which are not specifically limited here.

[0038] In an embodiment of the present application, the first extension portion extends from the other side of the first end wall to the outside of the accommodating space. By way of example, the first extension portion may be a flange extending outward from the other side of the first end wall. The plane where the flange is located may be parallel to the plane where the first bottom wall is located. The plane where the flange is located is not parallel to the plane where the first bottom wall is located. No specific limitation is made here.

[0039] The present application provides an energy storage device and an energy storage system, wherein the energy storage device comprises a battery cell and a first shell, wherein the first shell comprises a first bottom wall, a first end plate, an extension portion and a gripping member, wherein the first bottom wall and the first end plate are adapted to define a housing space, wherein the housing space is adapted to accommodate at least part of the battery cell, wherein one side of the first end plate is connected to the bottom wall, the extension portion extends from the other side of the first end plate to the outside of the housing space, and the gripping member is fixed to the first extension portion. The energy storage device is provided with a gripping member at the extension portion, so that the energy storage device is more suitable for being moved, thereby increasing the portability of the energy storage device.

[0040] The above scheme introduces an energy storage device provided by the present application. The extension part of the energy storage device provided by the present application also has a specific implementation method, which will be described in detail in the following embodiments.

[0041] In the present application, optionally, in a possible implementation, the extension portion includes a first area, the first area is suitable for forming a sealing area and a second area, and the second area is suitable for fixing the gripping member.

[0042] In the embodiment of the present application, for example, if the extension portion is a flange formed by the first end plate extending away from the accommodating space, the surface of the flange body on the side away from the accommodating space can be understood as the second area, the second area is fixedly connected to the gripping member, and the gripping member can be fixed to the second area in a variety of ways, and the surface of the flange body on the side close to the accommodating space can be understood as the first area. Since the first area needs to be snapped together with other shells that constitute the accommodating space, the surface of the first area of ​​the extension portion can be equipped with a sealing member, that is, it can be understood that the first area is a sealing area.

[0043] In this embodiment, the first extension part has two functions at the same time. First, the first area of ​​the first extension part can fix the gripping member so that the relevant maintenance personnel can move the energy storage device according to the gripping member. In addition, if the first shell is buckled with other shells to form an accommodating space, optionally, in order to consider waterproofing and dustproofing, a sealing member needs to be set between the first shell and the other shells, and the first area of ​​the first extension part can be used as a sealing area to install the waterproof member. As a result, the first extension part integrates the setting position of the sealing member and the fixing position of the gripping member into one, so that the sealing member and the gripping member can realize space reuse to a certain extent, and the space of the energy storage device can be used more efficiently, further reducing the volume of the energy storage device and increasing the volume utilization rate.

[0044] The above scheme introduces a specific implementation method of a first extension portion provided by the present application. The gripping portion provided by the present application also has a specific implementation method, which will be specifically described in the following embodiments.

[0045] Optionally, in a possible implementation, the gripping member includes a mounting portion and a gripping portion, the mounting portion is suitable for being fixedly connected to the second extension portion, and the gripping portion is suitable for being gripped by a human hand to move the shell.

[0046] In the present application, the mounting portion is exemplarily used for assembly with the second extension portion, and the gripping portion can be a gripping hole, for example, the gripping portion is a bar-shaped through hole. When performing a wall-hanging operation, the operator's hand can pass through the bar-shaped through hole, thereby effectively holding the energy storage device, and the energy storage device can be easily hung on the wall by holding the gripping portion. The gripping portion can also be a gripping rod, and the gripping portion can also be other structures, which are not specifically limited here.

[0047] Optionally, in a possible implementation, two gripping members are fixedly arranged at intervals on the extension portion, so that the energy storage device can be more conveniently gripped when multiple people carry it, thereby increasing the convenience of the energy storage device.

[0048] The above scheme introduces a specific implementation method of a first extension portion and a gripping member provided by the present application. The structure of the energy storage device provided by the present application is introduced in detail below, and the specific structure will be described in the following embodiments.

[0049] Optionally, in a possible implementation, the first bottom wall further includes a second surface, the second surface is arranged opposite to the first surface of the first bottom wall, and the second surface of the first bottom wall is provided with a reinforcement structure, and the reinforcement structure is suitable for strengthening the rigidity of the shell.

[0050] Optionally, in a possible implementation, the reinforcement structure includes a first reinforcement rib, and the first reinforcement rib extends along the length direction of the shell, or the first reinforcement rib extends along the width direction of the shell.

[0051] In an embodiment of the present application, if the arrangement direction of the multiple battery cells is arranged along the length direction of the shell, a second reinforcing rib may be provided on the outer surface of the first shell, and the second reinforcing rib extends along the length direction of the first shell. Usually, the middle position of the first shell is easily deformed due to carrying too much weight. It can be seen from the simulation results that the expansion force of the battery cell has a greater impact on the middle area of ​​the first shell. Therefore, optionally, along the width direction, the second reinforcing ribs can be respectively provided in the middle area of ​​the shell and the two side areas of the shell, and the number of second reinforcing ribs in the middle area of ​​the shell is greater than the number of second reinforcing ribs in the two side areas of the shell. For example, three second reinforcing ribs are provided in the middle area, and one second reinforcing rib is provided in each of the two side areas. In this way, the structural strength of the middle area can be effectively strengthened, and the uneven distribution of the second reinforcing ribs can achieve the effect of weight reduction. In an embodiment of the present application, the second reinforcing ribs can also be provided in other ways on the first shell, which are not limited here.

[0052] In the embodiment of the present application, if the arrangement direction of the multiple battery cells is arranged along the width direction of the shell, a third reinforcing rib can be provided on the outer surface of the first shell, and the third reinforcing rib extends along the width direction of the first shell. Under normal circumstances, the middle position of the first shell 21 is easily deformed due to carrying too much weight. It can be seen from the simulation results that the expansion force of the battery cell has a greater impact on the middle area of ​​the first shell. Therefore, optionally, along the length direction, the third reinforcing ribs can be respectively provided in the middle area of ​​the shell and the two side areas of the shell, and the number of third reinforcing ribs in the middle area of ​​the shell is greater than the number of third reinforcing ribs in the two side areas of the shell. For example, three third reinforcing ribs are provided in the middle area, and one third reinforcing rib is provided in each of the two side areas. In this way, the structural strength of the middle area can be effectively strengthened, and the uneven distribution of the third reinforcing ribs can achieve the effect of weight reduction. In the embodiment of the present application, the third reinforcing ribs can also be arranged in other ways on the first shell, which are not limited here.

[0053] Optionally, in a possible implementation, the energy storage device also includes a second shell, the second shell is suitable for being snapped together with the first shell, the second shell includes a second bottom wall, the second bottom wall has a third surface and a fourth surface arranged opposite to each other, the third surface of the second bottom wall and the first surface of the first bottom wall are suitable for defining an accommodating space, and the accommodating space is suitable for accommodating battery cells; a second reinforcement structure, the second reinforcement structure is arranged on at least one of the third surface and the fourth surface, and the second reinforcement structure is suitable for strengthening the rigidity of the second shell.

[0054] In the embodiment of the present application, optionally, the second shell is buckled with the first shell, and the second shell includes a third surface and a fourth surface disposed opposite to each other, and the third surface and the first surface are used to define a housing space, and the housing space can accommodate the battery cell. In addition, in order to strengthen the rigidity of the second shell, a second reinforcement structure can be provided on the second shell, and the second reinforcement structure can be provided on either the third surface or the fourth surface, and the second reinforcement structure can also be provided on both the inner wall and the outer wall of the second shell, which is not limited here.

[0055] Optionally, in a possible implementation, the shell assembly also includes a first end plate; and a second end plate, the first end plate and the second end plate are arranged on the first surface of the first shell at intervals along the second direction of the shell, and the first end plate and the second end plate and the first surface of the first shell are suitable for defining an accommodating space.

[0056] Optionally, in a possible implementation, the housing assembly further includes a first side plate, the first side plate extends on the first surface in a direction away from the first surface, and the first side plate is connected to the first end plate and the second end plate on the same side end. In a possible implementation, the first side plate is provided with a notch, and the projection of the pole of the battery cell along the first direction is located within the projection of the notch along the first direction.

[0057] In this embodiment, the projection of the pole of the battery along the first direction falls within the projection of the notch along the first direction. The notch may be located at the end of the bottom wall, and the notch allows the welding mechanism to enter the first shell, thereby welding the battery in the first shell. The battery may include only one battery cell or multiple battery cells. The pole of the battery cell is exposed at the notch. When there are multiple battery cells, the welding mechanism, such as a laser welding nozzle, can enter the cavity of the first shell through the notch to weld the poles of the multiple battery cells together through the connecting piece. After welding, the total positive pole and the total negative pole are then connected to the busbar thread through the wire. During the connection process, tools such as wrenches can tighten the connection between the wire and the total positive pole, the total negative pole, and the busbar from the notch. Compared with the prior art that requires the battery to be clamped with a pull plate first and then welded and placed in the box, in this embodiment, the battery can be carried on the bottom wall first, and then the welding mechanism welds the battery from the notch, so it is no longer necessary to clamp the battery with a pull plate, which reduces the thickness of the energy storage device, saves costs, improves efficiency, and improves space utilization. The axis of the pole can be arranged in the left-right direction or in the up-down direction, as long as the projection along the first direction falls into the notch.

[0058] Optionally, in a possible implementation, the first shell also includes a second side panel and a third side panel, and the second side panel and the third side panel are arranged on one side of the inner wall of the first shell, and the second side panel and the third side panel are respectively connected to the same side ends of the first end plate and the second end plate, and a gap is arranged between the first side panel and the second side panel along the second direction.

[0059] Optionally, in a possible implementation, a gap is provided between the first side plate and the second side plate along the width direction, and a projection of a pole of the battery cell along the first direction is located within a projection of the gap along the first direction.

[0060] In this embodiment, the projection of the pole of the battery along the first direction falls within the projection of the gap along the first direction. The gap may be located at the end of the bottom wall, and the gap allows the welding mechanism to enter the first shell, thereby welding the battery in the first shell. The battery may include only one battery cell or multiple battery cells. The pole of the battery cell is exposed at the gap. When there are multiple battery cells, the welding mechanism, such as a laser welding nozzle, can enter the cavity of the first shell through the gap and weld the poles of the multiple battery cells together through the connecting piece. After welding, the total positive pole and the total negative pole are then connected to the busbar thread through the wire. During the connection process, tools such as wrenches can tighten the wires and the total positive pole, the total negative pole, and the busbar connection from the gap. Compared with the prior art that requires the battery to be clamped with a pull plate first and then welded and placed in the box, in this embodiment, the battery can be carried on the bottom wall first, and then the welding mechanism welds the battery from the gap, so it is no longer necessary to clamp the battery with a pull plate, which reduces the thickness of the energy storage device, saves costs, improves efficiency, and improves space utilization. The axis of the pole can be arranged in the left-right direction or in the up-down direction, as long as the projection along the first direction falls within the gap.

[0061] Optionally, in a possible implementation, the housing assembly further includes a fixing frame, the fixing frame extends along the inner wall in a direction away from the inner wall, and limiting structures are provided at both ends of the fixing frame.

[0062] Exemplarily, the fixing frame extends along the length direction of the first shell and is fixed on the bottom wall of the first shell, and the plurality of battery cells are arranged on the first surface of the bottom wall of the first shell along the width direction. The first reinforcing structure extends along the width direction and is fixed on the second surface of the first shell. In this embodiment, the first reinforcing structure is arranged orthogonally to the fixing frame. When the energy storage device is hung and assembled on the wall, the fixing frame can carry the battery cells arranged on the fixing frame. Compared with the arrangement in which the extension direction of the first reinforcing rib is parallel to the extension direction of the fixing frame, this arrangement can effectively improve the structural strength of the first shell in different directions. The limiting protrusion on the fixing frame can limit the battery cell to prevent the battery cell 1 from shaking during installation or use and causing damage to the energy storage device.

[0063] A second aspect of the present application provides an energy storage system, which includes an energy storage device and an electrical device, wherein the energy storage device is electrically connected to the electrical device, and the energy storage device is any one of the energy storage devices described in the above embodiments.

[0064] The present application provides an energy storage device and an energy storage system, wherein the energy storage device comprises a battery cell and a first shell, wherein the first shell comprises a first bottom wall, a first end plate, an extension portion and a gripping member, wherein the first bottom wall and the first end plate are adapted to define a housing space, wherein the housing space is adapted to accommodate at least part of the battery cell, wherein one side of the first end plate is connected to the bottom wall, the first extension portion extends from the other side of the first end plate to the outside of the housing space, and the gripping member is fixed to the first extension portion. The energy storage device is provided with a gripping member at the extension portion, so that the energy storage device is more suitable for being moved, thereby increasing the portability of the energy storage device.

[0065] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0066] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An energy storage device, characterized in that: include: Battery cells; A first housing, the first housing comprising: a first bottom wall; A first end plate, wherein the first bottom wall and the first end plate are adapted to define an accommodation space, wherein the accommodation space is adapted to accommodate at least a portion of the battery cells, wherein one side of the first end plate is connected to the bottom wall; an extension portion, the extension portion extending from the other side of the first end plate toward outside the accommodating space; and A gripping member is fixed to the extending portion.

2. The energy storage device according to claim 1, characterized in that: The extension portion comprises: a first region, the first region being adapted to form a sealing area; and A second region adapted to secure the gripping member.

3. The energy storage device according to claim 2, characterized in that: The gripping member comprises: A mounting portion, the mounting portion being adapted to be fixedly connected to the second region; and A gripping portion, wherein the gripping portion is suitable for being gripped by a human hand to move the energy storage device.

4. The energy storage device according to claim 3, characterized in that: The gripping portion includes a gripping hole or a gripping rod.

5. The energy storage device according to any one of claims 1 to 4, characterized in that: The extending portion is provided with two gripping members at fixed intervals.

6. The energy storage device according to any one of claims 1 to 4, characterized in that: The first bottom wall further comprises: The second surface is arranged opposite to the first surface of the first bottom wall, and the second surface of the first bottom wall is provided with a reinforcement structure, and the reinforcement structure is suitable for strengthening the rigidity of the shell.

7. The energy storage device according to claim 6, characterized in that: The reinforcement structure comprises: The first reinforcing rib extends along the length direction of the shell, or the first reinforcing rib extends along the width direction of the shell.

8. The energy storage device according to any one of claims 1 to 4, characterized in that: The energy storage device also includes: a second shell, the second shell being adapted to be buckled with the first shell, the second shell comprising a second bottom wall, the second bottom wall having a third surface and a fourth surface disposed opposite to each other, the third surface of the second bottom wall and the first surface of the first bottom wall being adapted to define the accommodation space, the accommodation space being adapted to accommodate the battery cell; A second reinforcement structure, wherein the second reinforcement structure is disposed on at least one of the third surface and the fourth surface, and the second reinforcement structure is suitable for strengthening the rigidity of the second shell.

9. The energy storage device according to any one of claims 1 to 4, characterized in that: The housing assembly further comprises: a first end plate; and The second end plate, the first end plate and the second end plate are arranged on the first surface of the first shell at intervals along the second direction of the shell, and the first end plate and the second end plate and the first surface of the first shell are suitable for defining the accommodating space.

10. The energy storage device according to claim 9, characterized in that: The housing assembly further comprises: A first side plate extends on the first surface in a direction away from the first surface, and the first side plate is connected to ends of the first end plate and the second end plate on the same side.

11. The energy storage device according to claim 10, characterized in that: The first side plate is provided with a notch, and the projection of the pole of the battery cell along the first direction is located within the projection of the notch along the first direction.

12. The energy storage device according to claim 9, characterized in that: The first housing further comprises: A second side plate and a third side plate, the second side plate and the third side plate are arranged on one side of the first surface of the first bottom wall, the second side plate and the third side plate are respectively connected to the same side ends of the first end plate and the second end plate, and a gap is arranged between the first side plate and the second side plate along the second direction.

13. The energy storage device according to claim 12, characterized in that: Along the width direction, a gap is provided between the first side plate and the second side plate, and a projection of the pole of the battery cell along the first direction is located within a projection of the gap along the first direction.

14. The energy storage device according to any one of claims 1 to 4, characterized in that: The housing assembly further comprises: A fixing frame extends on the first surface of the first bottom wall in a direction away from the first surface, and limiting structures are provided at both ends of the fixing frame.

15. An energy storage system, characterized in that: The energy storage system comprises an energy storage device and an electrical equipment, the energy storage device is electrically connected to the electrical equipment, and the energy storage device is the energy storage device as claimed in any one of claims 1 to 14.

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